target/xtensa: remove needless target_was_examined check

[openocd.git] / src / target / xtensa / xtensa.c

// SPDX-License-Identifier: GPL-2.0-or-later

/***************************************************************************
 *   Generic Xtensa target API for OpenOCD                                 *
 *   Copyright (C) 2020-2022 Cadence Design Systems, Inc.                  *
 *   Copyright (C) 2016-2019 Espressif Systems Ltd.                        *
 *   Derived from esp108.c                                                 *
 *   Author: Angus Gratton gus@projectgus.com                              *
 ***************************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#include <helper/time_support.h>
#include <helper/align.h>
#include <target/register.h>

#include "xtensa_chip.h"
#include "xtensa.h"

/* Swap 4-bit Xtensa opcodes and fields */
#define XT_NIBSWAP8(V)                                                                  \
        ((((V) & 0x0F) << 4)                                                            \
                | (((V) & 0xF0) >> 4))

#define XT_NIBSWAP16(V)                                                                 \
        ((((V) & 0x000F) << 12)                                                         \
                | (((V) & 0x00F0) << 4)                                                 \
                | (((V) & 0x0F00) >> 4)                                                 \
                | (((V) & 0xF000) >> 12))

#define XT_NIBSWAP24(V)                                                                 \
        ((((V) & 0x00000F) << 20)                                                       \
                | (((V) & 0x0000F0) << 12)                                              \
                | (((V) & 0x000F00) << 4)                                               \
                | (((V) & 0x00F000) >> 4)                                               \
                | (((V) & 0x0F0000) >> 12)                                              \
                | (((V) & 0xF00000) >> 20))

/* _XT_INS_FORMAT_*()
 * Instruction formatting converted from little-endian inputs
 * and shifted to the MSB-side of DIR for BE systems.
 */
#define _XT_INS_FORMAT_RSR(X, OPCODE, SR, T)                    \
        (XT_ISBE(X) ? (XT_NIBSWAP24(OPCODE)                                     \
                        | (((T) & 0x0F) << 16)                                          \
                        | (((SR) & 0xFF) << 8)) << 8                            \
                : (OPCODE)                                                                              \
                | (((SR) & 0xFF) << 8)                                                  \
                | (((T) & 0x0F) << 4))

#define _XT_INS_FORMAT_RRR(X, OPCODE, ST, R)                    \
        (XT_ISBE(X) ? (XT_NIBSWAP24(OPCODE)                                     \
                        | ((XT_NIBSWAP8((ST) & 0xFF)) << 12)            \
                        | (((R) & 0x0F) << 8)) << 8                                     \
                : (OPCODE)                                                                              \
                | (((ST) & 0xFF) << 4)                                                  \
                | (((R) & 0x0F) << 12))

#define _XT_INS_FORMAT_RRRN(X, OPCODE, S, T, IMM4)              \
        (XT_ISBE(X) ? (XT_NIBSWAP16(OPCODE)                                     \
                        | (((T) & 0x0F) << 8)                                           \
                        | (((S) & 0x0F) << 4)                                           \
                        | ((IMM4) & 0x0F)) << 16                                        \
                : (OPCODE)                                                                              \
                | (((T) & 0x0F) << 4)                                                   \
                | (((S) & 0x0F) << 8)                                                   \
                | (((IMM4) & 0x0F) << 12))

#define _XT_INS_FORMAT_RRI8(X, OPCODE, R, S, T, IMM8)   \
        (XT_ISBE(X) ? (XT_NIBSWAP24(OPCODE)                                     \
                        | (((T) & 0x0F) << 16)                                          \
                        | (((S) & 0x0F) << 12)                                          \
                        | (((R) & 0x0F) << 8)                                           \
                        | ((IMM8) & 0xFF)) << 8                                         \
                : (OPCODE)                                                                              \
                | (((IMM8) & 0xFF) << 16)                                               \
                | (((R) & 0x0F) << 12)                                                  \
                | (((S) & 0x0F) << 8)                                                   \
                | (((T) & 0x0F) << 4))

#define _XT_INS_FORMAT_RRI4(X, OPCODE, IMM4, R, S, T)   \
        (XT_ISBE(X) ? (XT_NIBSWAP24(OPCODE)                                     \
                        | (((T) & 0x0F) << 16)                                          \
                        | (((S) & 0x0F) << 12)                                          \
                        | (((R) & 0x0F) << 8)) << 8                                     \
                | ((IMM4) & 0x0F)                                                               \
                : (OPCODE)                                                                              \
                | (((IMM4) & 0x0F) << 20)                                               \
                | (((R) & 0x0F) << 12)                                                  \
                | (((S) & 0x0F) << 8)                                                   \
                | (((T) & 0x0F) << 4))

/* Xtensa processor instruction opcodes
*/
/* "Return From Debug Operation" to Normal */
#define XT_INS_RFDO(X) (XT_ISBE(X) ? 0x000e1f << 8 : 0xf1e000)
/* "Return From Debug and Dispatch" - allow sw debugging stuff to take over */
#define XT_INS_RFDD(X) (XT_ISBE(X) ? 0x010e1f << 8 : 0xf1e010)

/* Load to DDR register, increase addr register */
#define XT_INS_LDDR32P(X, S) (XT_ISBE(X) ? (0x0E0700 | ((S) << 12)) << 8 : (0x0070E0 | ((S) << 8)))
/* Store from DDR register, increase addr register */
#define XT_INS_SDDR32P(X, S) (XT_ISBE(X) ? (0x0F0700 | ((S) << 12)) << 8 : (0x0070F0 | ((S) << 8)))

/* Load 32-bit Indirect from A(S)+4*IMM8 to A(T) */
#define XT_INS_L32I(X, S, T, IMM8)  _XT_INS_FORMAT_RRI8(X, 0x002002, 0, S, T, IMM8)
/* Load 16-bit Unsigned from A(S)+2*IMM8 to A(T) */
#define XT_INS_L16UI(X, S, T, IMM8) _XT_INS_FORMAT_RRI8(X, 0x001002, 0, S, T, IMM8)
/* Load 8-bit Unsigned from A(S)+IMM8 to A(T) */
#define XT_INS_L8UI(X, S, T, IMM8)  _XT_INS_FORMAT_RRI8(X, 0x000002, 0, S, T, IMM8)

/* Store 32-bit Indirect to A(S)+4*IMM8 from A(T) */
#define XT_INS_S32I(X, S, T, IMM8) _XT_INS_FORMAT_RRI8(X, 0x006002, 0, S, T, IMM8)
/* Store 16-bit to A(S)+2*IMM8 from A(T) */
#define XT_INS_S16I(X, S, T, IMM8) _XT_INS_FORMAT_RRI8(X, 0x005002, 0, S, T, IMM8)
/* Store 8-bit to A(S)+IMM8 from A(T) */
#define XT_INS_S8I(X, S, T, IMM8)  _XT_INS_FORMAT_RRI8(X, 0x004002, 0, S, T, IMM8)

/* Cache Instructions */
#define XT_INS_IHI(X, S, IMM8) _XT_INS_FORMAT_RRI8(X, 0x0070E2, 0, S, 0, IMM8)
#define XT_INS_DHWBI(X, S, IMM8) _XT_INS_FORMAT_RRI8(X, 0x007052, 0, S, 0, IMM8)
#define XT_INS_DHWB(X, S, IMM8) _XT_INS_FORMAT_RRI8(X, 0x007042, 0, S, 0, IMM8)
#define XT_INS_ISYNC(X) (XT_ISBE(X) ? 0x000200 << 8 : 0x002000)

/* Control Instructions */
#define XT_INS_JX(X, S) (XT_ISBE(X) ? (0x050000 | ((S) << 12)) : (0x0000a0 | ((S) << 8)))
#define XT_INS_CALL0(X, IMM18) (XT_ISBE(X) ? (0x500000 | ((IMM18) & 0x3ffff)) : (0x000005 | (((IMM18) & 0x3ffff) << 6)))

/* Read Special Register */
#define XT_INS_RSR(X, SR, T) _XT_INS_FORMAT_RSR(X, 0x030000, SR, T)
/* Write Special Register */
#define XT_INS_WSR(X, SR, T) _XT_INS_FORMAT_RSR(X, 0x130000, SR, T)
/* Swap Special Register */
#define XT_INS_XSR(X, SR, T) _XT_INS_FORMAT_RSR(X, 0x610000, SR, T)

/* Rotate Window by (-8..7) */
#define XT_INS_ROTW(X, N) (XT_ISBE(X) ? ((0x000804) | (((N) & 15) << 16)) << 8 : ((0x408000) | (((N) & 15) << 4)))

/* Read User Register */
#define XT_INS_RUR(X, UR, T) _XT_INS_FORMAT_RRR(X, 0xE30000, UR, T)
/* Write User Register */
#define XT_INS_WUR(X, UR, T) _XT_INS_FORMAT_RSR(X, 0xF30000, UR, T)

/* Read Floating-Point Register */
#define XT_INS_RFR(X, FR, T) _XT_INS_FORMAT_RRR(X, 0xFA0000, ((FR << 4) | 0x4), T)
/* Write Floating-Point Register */
#define XT_INS_WFR(X, FR, T) _XT_INS_FORMAT_RRR(X, 0xFA0000, ((T << 4) | 0x5), FR)

#define XT_INS_L32E(X, R, S, T) _XT_INS_FORMAT_RRI4(X, 0x090000, 0, R, S, T)
#define XT_INS_S32E(X, R, S, T) _XT_INS_FORMAT_RRI4(X, 0x490000, 0, R, S, T)
#define XT_INS_L32E_S32E_MASK(X)   (XT_ISBE(X) ? 0xF000FF << 8 : 0xFF000F)

#define XT_INS_RFWO(X) (XT_ISBE(X) ? 0x004300 << 8 : 0x003400)
#define XT_INS_RFWU(X) (XT_ISBE(X) ? 0x005300 << 8 : 0x003500)
#define XT_INS_RFWO_RFWU_MASK(X)   (XT_ISBE(X) ? 0xFFFFFF << 8 : 0xFFFFFF)

#define XT_WATCHPOINTS_NUM_MAX  2

/* Special register number macro for DDR, PS, WB, A3, A4 registers.
 * These get used a lot so making a shortcut is useful.
 */
#define XT_SR_DDR         (xtensa_regs[XT_REG_IDX_DDR].reg_num)
#define XT_SR_PS          (xtensa_regs[XT_REG_IDX_PS].reg_num)
#define XT_SR_WB          (xtensa_regs[XT_REG_IDX_WINDOWBASE].reg_num)
#define XT_REG_A3         (xtensa_regs[XT_REG_IDX_AR3].reg_num)
#define XT_REG_A4         (xtensa_regs[XT_REG_IDX_AR4].reg_num)

#define XT_PS_REG_NUM               (0xe6U)
#define XT_EPS_REG_NUM_BASE         (0xc0U)     /* (EPS2 - 2), for adding DBGLEVEL */
#define XT_EPC_REG_NUM_BASE         (0xb0U)     /* (EPC1 - 1), for adding DBGLEVEL */
#define XT_PC_REG_NUM_VIRTUAL       (0xffU)     /* Marker for computing PC (EPC[DBGLEVEL) */
#define XT_PC_DBREG_NUM_BASE        (0x20U)     /* External (i.e., GDB) access */

#define XT_SW_BREAKPOINTS_MAX_NUM       32
#define XT_HW_IBREAK_MAX_NUM            2
#define XT_HW_DBREAK_MAX_NUM            2

struct xtensa_reg_desc xtensa_regs[XT_NUM_REGS] = {
        XT_MK_REG_DESC("pc", XT_PC_REG_NUM_VIRTUAL, XT_REG_SPECIAL, 0),
        XT_MK_REG_DESC("ar0", 0x00, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar1", 0x01, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar2", 0x02, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar3", 0x03, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar4", 0x04, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar5", 0x05, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar6", 0x06, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar7", 0x07, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar8", 0x08, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar9", 0x09, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar10", 0x0A, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar11", 0x0B, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar12", 0x0C, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar13", 0x0D, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar14", 0x0E, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar15", 0x0F, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar16", 0x10, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar17", 0x11, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar18", 0x12, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar19", 0x13, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar20", 0x14, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar21", 0x15, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar22", 0x16, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar23", 0x17, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar24", 0x18, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar25", 0x19, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar26", 0x1A, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar27", 0x1B, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar28", 0x1C, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar29", 0x1D, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar30", 0x1E, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar31", 0x1F, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar32", 0x20, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar33", 0x21, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar34", 0x22, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar35", 0x23, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar36", 0x24, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar37", 0x25, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar38", 0x26, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar39", 0x27, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar40", 0x28, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar41", 0x29, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar42", 0x2A, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar43", 0x2B, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar44", 0x2C, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar45", 0x2D, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar46", 0x2E, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar47", 0x2F, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar48", 0x30, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar49", 0x31, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar50", 0x32, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar51", 0x33, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar52", 0x34, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar53", 0x35, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar54", 0x36, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar55", 0x37, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar56", 0x38, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar57", 0x39, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar58", 0x3A, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar59", 0x3B, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar60", 0x3C, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar61", 0x3D, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar62", 0x3E, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("ar63", 0x3F, XT_REG_GENERAL, 0),
        XT_MK_REG_DESC("windowbase", 0x48, XT_REG_SPECIAL, 0),
        XT_MK_REG_DESC("windowstart", 0x49, XT_REG_SPECIAL, 0),
        XT_MK_REG_DESC("ps", XT_PS_REG_NUM, XT_REG_SPECIAL, 0), /* PS (not mapped through EPS[]) */
        XT_MK_REG_DESC("ibreakenable", 0x60, XT_REG_SPECIAL, 0),
        XT_MK_REG_DESC("ddr", 0x68, XT_REG_DEBUG, XT_REGF_NOREAD),
        XT_MK_REG_DESC("ibreaka0", 0x80, XT_REG_SPECIAL, 0),
        XT_MK_REG_DESC("ibreaka1", 0x81, XT_REG_SPECIAL, 0),
        XT_MK_REG_DESC("dbreaka0", 0x90, XT_REG_SPECIAL, 0),
        XT_MK_REG_DESC("dbreaka1", 0x91, XT_REG_SPECIAL, 0),
        XT_MK_REG_DESC("dbreakc0", 0xA0, XT_REG_SPECIAL, 0),
        XT_MK_REG_DESC("dbreakc1", 0xA1, XT_REG_SPECIAL, 0),
        XT_MK_REG_DESC("cpenable", 0xE0, XT_REG_SPECIAL, 0),
        XT_MK_REG_DESC("exccause", 0xE8, XT_REG_SPECIAL, 0),
        XT_MK_REG_DESC("debugcause", 0xE9, XT_REG_SPECIAL, 0),
        XT_MK_REG_DESC("icount", 0xEC, XT_REG_SPECIAL, 0),
        XT_MK_REG_DESC("icountlevel", 0xED, XT_REG_SPECIAL, 0),

        /* WARNING: For these registers, regnum points to the
         * index of the corresponding ARx registers, NOT to
         * the processor register number! */
        XT_MK_REG_DESC("a0", XT_REG_IDX_AR0, XT_REG_RELGEN, 0),
        XT_MK_REG_DESC("a1", XT_REG_IDX_AR1, XT_REG_RELGEN, 0),
        XT_MK_REG_DESC("a2", XT_REG_IDX_AR2, XT_REG_RELGEN, 0),
        XT_MK_REG_DESC("a3", XT_REG_IDX_AR3, XT_REG_RELGEN, 0),
        XT_MK_REG_DESC("a4", XT_REG_IDX_AR4, XT_REG_RELGEN, 0),
        XT_MK_REG_DESC("a5", XT_REG_IDX_AR5, XT_REG_RELGEN, 0),
        XT_MK_REG_DESC("a6", XT_REG_IDX_AR6, XT_REG_RELGEN, 0),
        XT_MK_REG_DESC("a7", XT_REG_IDX_AR7, XT_REG_RELGEN, 0),
        XT_MK_REG_DESC("a8", XT_REG_IDX_AR8, XT_REG_RELGEN, 0),
        XT_MK_REG_DESC("a9", XT_REG_IDX_AR9, XT_REG_RELGEN, 0),
        XT_MK_REG_DESC("a10", XT_REG_IDX_AR10, XT_REG_RELGEN, 0),
        XT_MK_REG_DESC("a11", XT_REG_IDX_AR11, XT_REG_RELGEN, 0),
        XT_MK_REG_DESC("a12", XT_REG_IDX_AR12, XT_REG_RELGEN, 0),
        XT_MK_REG_DESC("a13", XT_REG_IDX_AR13, XT_REG_RELGEN, 0),
        XT_MK_REG_DESC("a14", XT_REG_IDX_AR14, XT_REG_RELGEN, 0),
        XT_MK_REG_DESC("a15", XT_REG_IDX_AR15, XT_REG_RELGEN, 0),
};

/**
 * Types of memory used at xtensa target
 */
enum xtensa_mem_region_type {
        XTENSA_MEM_REG_IROM = 0x0,
        XTENSA_MEM_REG_IRAM,
        XTENSA_MEM_REG_DROM,
        XTENSA_MEM_REG_DRAM,
        XTENSA_MEM_REG_SRAM,
        XTENSA_MEM_REG_SROM,
        XTENSA_MEM_REGS_NUM
};

/* Register definition as union for list allocation */
union xtensa_reg_val_u {
        xtensa_reg_val_t val;
        uint8_t buf[4];
};

static const struct xtensa_keyval_info_s xt_qerr[XT_QERR_NUM] = {
        { .chrval = "E00", .intval = ERROR_FAIL },
        { .chrval = "E01", .intval = ERROR_FAIL },
        { .chrval = "E02", .intval = ERROR_COMMAND_ARGUMENT_INVALID },
        { .chrval = "E03", .intval = ERROR_FAIL },
};

/* Set to true for extra debug logging */
static const bool xtensa_extra_debug_log;

/**
 * Gets a config for the specific mem type
 */
static inline const struct xtensa_local_mem_config *xtensa_get_mem_config(
        struct xtensa *xtensa,
        enum xtensa_mem_region_type type)
{
        switch (type) {
        case XTENSA_MEM_REG_IROM:
                return &xtensa->core_config->irom;
        case XTENSA_MEM_REG_IRAM:
                return &xtensa->core_config->iram;
        case XTENSA_MEM_REG_DROM:
                return &xtensa->core_config->drom;
        case XTENSA_MEM_REG_DRAM:
                return &xtensa->core_config->dram;
        case XTENSA_MEM_REG_SRAM:
                return &xtensa->core_config->sram;
        case XTENSA_MEM_REG_SROM:
                return &xtensa->core_config->srom;
        default:
                return NULL;
        }
}

/**
 * Extracts an exact xtensa_local_mem_region_config from xtensa_local_mem_config
 * for a given address
 * Returns NULL if nothing found
 */
static inline const struct xtensa_local_mem_region_config *xtensa_memory_region_find(
        const struct xtensa_local_mem_config *mem,
        target_addr_t address)
{
        for (unsigned int i = 0; i < mem->count; i++) {
                const struct xtensa_local_mem_region_config *region = &mem->regions[i];
                if (address >= region->base && address < (region->base + region->size))
                        return region;
        }
        return NULL;
}

/**
 * Returns a corresponding xtensa_local_mem_region_config from the xtensa target
 * for a given address
 * Returns NULL if nothing found
 */
static inline const struct xtensa_local_mem_region_config *xtensa_target_memory_region_find(
        struct xtensa *xtensa,
        target_addr_t address)
{
        const struct xtensa_local_mem_region_config *result;
        const struct xtensa_local_mem_config *mcgf;
        for (unsigned int mtype = 0; mtype < XTENSA_MEM_REGS_NUM; mtype++) {
                mcgf = xtensa_get_mem_config(xtensa, mtype);
                result = xtensa_memory_region_find(mcgf, address);
                if (result)
                        return result;
        }
        return NULL;
}

static inline bool xtensa_is_cacheable(const struct xtensa_cache_config *cache,
        const struct xtensa_local_mem_config *mem,
        target_addr_t address)
{
        if (!cache->size)
                return false;
        return xtensa_memory_region_find(mem, address);
}

static inline bool xtensa_is_icacheable(struct xtensa *xtensa, target_addr_t address)
{
        return xtensa_is_cacheable(&xtensa->core_config->icache, &xtensa->core_config->iram, address) ||
               xtensa_is_cacheable(&xtensa->core_config->icache, &xtensa->core_config->irom, address) ||
               xtensa_is_cacheable(&xtensa->core_config->icache, &xtensa->core_config->sram, address) ||
               xtensa_is_cacheable(&xtensa->core_config->icache, &xtensa->core_config->srom, address);
}

static inline bool xtensa_is_dcacheable(struct xtensa *xtensa, target_addr_t address)
{
        return xtensa_is_cacheable(&xtensa->core_config->dcache, &xtensa->core_config->dram, address) ||
               xtensa_is_cacheable(&xtensa->core_config->dcache, &xtensa->core_config->drom, address) ||
               xtensa_is_cacheable(&xtensa->core_config->dcache, &xtensa->core_config->sram, address) ||
               xtensa_is_cacheable(&xtensa->core_config->dcache, &xtensa->core_config->srom, address);
}

static int xtensa_core_reg_get(struct reg *reg)
{
        /* We don't need this because we read all registers on halt anyway. */
        struct xtensa *xtensa = (struct xtensa *)reg->arch_info;
        struct target *target = xtensa->target;

        if (target->state != TARGET_HALTED)
                return ERROR_TARGET_NOT_HALTED;
        if (!reg->exist) {
                if (strncmp(reg->name, "?0x", 3) == 0) {
                        unsigned int regnum = strtoul(reg->name + 1, 0, 0);
                        LOG_WARNING("Read unknown register 0x%04x ignored", regnum);
                        return ERROR_OK;
                }
                return ERROR_COMMAND_ARGUMENT_INVALID;
        }
        return ERROR_OK;
}

static int xtensa_core_reg_set(struct reg *reg, uint8_t *buf)
{
        struct xtensa *xtensa = (struct xtensa *)reg->arch_info;
        struct target *target = xtensa->target;

        assert(reg->size <= 64 && "up to 64-bit regs are supported only!");
        if (target->state != TARGET_HALTED)
                return ERROR_TARGET_NOT_HALTED;

        if (!reg->exist) {
                if (strncmp(reg->name, "?0x", 3) == 0) {
                        unsigned int regnum = strtoul(reg->name + 1, 0, 0);
                        LOG_WARNING("Write unknown register 0x%04x ignored", regnum);
                        return ERROR_OK;
                }
                return ERROR_COMMAND_ARGUMENT_INVALID;
        }

        buf_cpy(buf, reg->value, reg->size);

        if (xtensa->core_config->windowed) {
                /* If the user updates a potential scratch register, track for conflicts */
                for (enum xtensa_ar_scratch_set_e s = 0; s < XT_AR_SCRATCH_NUM; s++) {
                        if (strcmp(reg->name, xtensa->scratch_ars[s].chrval) == 0) {
                                LOG_DEBUG("Scratch reg %s [0x%08" PRIx32 "] set from gdb", reg->name,
                                        buf_get_u32(reg->value, 0, 32));
                                LOG_DEBUG("scratch_ars mapping: a3/%s, a4/%s",
                                        xtensa->scratch_ars[XT_AR_SCRATCH_AR3].chrval,
                                        xtensa->scratch_ars[XT_AR_SCRATCH_AR4].chrval);
                                xtensa->scratch_ars[s].intval = true;
                                break;
                        }
                }
        }
        reg->dirty = true;
        reg->valid = true;

        return ERROR_OK;
}

static const struct reg_arch_type xtensa_reg_type = {
        .get = xtensa_core_reg_get,
        .set = xtensa_core_reg_set,
};

/* Convert a register index that's indexed relative to windowbase, to the real address. */
static enum xtensa_reg_id xtensa_windowbase_offset_to_canonical(struct xtensa *xtensa,
        enum xtensa_reg_id reg_idx,
        int windowbase)
{
        unsigned int idx;
        if (reg_idx >= XT_REG_IDX_AR0 && reg_idx <= XT_REG_IDX_ARLAST) {
                idx = reg_idx - XT_REG_IDX_AR0;
        } else if (reg_idx >= XT_REG_IDX_A0 && reg_idx <= XT_REG_IDX_A15) {
                idx = reg_idx - XT_REG_IDX_A0;
        } else {
                LOG_ERROR("Error: can't convert register %d to non-windowbased register!", reg_idx);
                return -1;
        }
        return ((idx + windowbase * 4) & (xtensa->core_config->aregs_num - 1)) + XT_REG_IDX_AR0;
}

static enum xtensa_reg_id xtensa_canonical_to_windowbase_offset(struct xtensa *xtensa,
        enum xtensa_reg_id reg_idx,
        int windowbase)
{
        return xtensa_windowbase_offset_to_canonical(xtensa, reg_idx, -windowbase);
}

static void xtensa_mark_register_dirty(struct xtensa *xtensa, enum xtensa_reg_id reg_idx)
{
        struct reg *reg_list = xtensa->core_cache->reg_list;
        reg_list[reg_idx].dirty = true;
}

static void xtensa_queue_exec_ins(struct xtensa *xtensa, uint32_t ins)
{
        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DIR0EXEC, ins);
}

static void xtensa_queue_exec_ins_wide(struct xtensa *xtensa, uint8_t *ops, uint8_t oplen)
{
        const int max_oplen = 64;       /* 8 DIRx regs: max width 64B */
        if ((oplen > 0) && (oplen <= max_oplen)) {
                uint8_t ops_padded[max_oplen];
                memcpy(ops_padded, ops, oplen);
                memset(ops_padded + oplen, 0, max_oplen - oplen);
                unsigned int oplenw = DIV_ROUND_UP(oplen, sizeof(uint32_t));
                for (int32_t i = oplenw - 1; i > 0; i--)
                        xtensa_queue_dbg_reg_write(xtensa,
                                XDMREG_DIR0 + i,
                                target_buffer_get_u32(xtensa->target, &ops_padded[sizeof(uint32_t)*i]));
                /* Write DIR0EXEC last */
                xtensa_queue_dbg_reg_write(xtensa,
                        XDMREG_DIR0EXEC,
                        target_buffer_get_u32(xtensa->target, &ops_padded[0]));
        }
}

static int xtensa_queue_pwr_reg_write(struct xtensa *xtensa, unsigned int reg, uint32_t data)
{
        struct xtensa_debug_module *dm = &xtensa->dbg_mod;
        return dm->pwr_ops->queue_reg_write(dm, reg, data);
}

/* NOTE: Assumes A3 has already been saved */
static int xtensa_window_state_save(struct target *target, uint32_t *woe)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        int woe_dis;
        uint8_t woe_buf[4];

        if (xtensa->core_config->windowed) {
                /* Save PS (LX) and disable window overflow exceptions prior to AR save */
                xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_PS, XT_REG_A3));
                xtensa_queue_exec_ins(xtensa, XT_INS_WSR(xtensa, XT_SR_DDR, XT_REG_A3));
                xtensa_queue_dbg_reg_read(xtensa, XDMREG_DDR, woe_buf);
                int res = xtensa_dm_queue_execute(&xtensa->dbg_mod);
                if (res != ERROR_OK) {
                        LOG_ERROR("Failed to read PS (%d)!", res);
                        return res;
                }
                xtensa_core_status_check(target);
                *woe = buf_get_u32(woe_buf, 0, 32);
                woe_dis = *woe & ~XT_PS_WOE_MSK;
                LOG_DEBUG("Clearing PS.WOE (0x%08" PRIx32 " -> 0x%08" PRIx32 ")", *woe, woe_dis);
                xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, woe_dis);
                xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));
                xtensa_queue_exec_ins(xtensa, XT_INS_WSR(xtensa, XT_SR_PS, XT_REG_A3));
        }
        return ERROR_OK;
}

/* NOTE: Assumes A3 has already been saved */
static void xtensa_window_state_restore(struct target *target, uint32_t woe)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        if (xtensa->core_config->windowed) {
                /* Restore window overflow exception state */
                xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, woe);
                xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));
                xtensa_queue_exec_ins(xtensa, XT_INS_WSR(xtensa, XT_SR_PS, XT_REG_A3));
                LOG_DEBUG("Restored PS.WOE (0x%08" PRIx32 ")", woe);
        }
}

static bool xtensa_reg_is_readable(int flags, int cpenable)
{
        if (flags & XT_REGF_NOREAD)
                return false;
        if ((flags & XT_REGF_COPROC0) && (cpenable & BIT(0)) == 0)
                return false;
        return true;
}

static bool xtensa_scratch_regs_fixup(struct xtensa *xtensa, struct reg *reg_list, int i, int j, int a_idx, int ar_idx)
{
        int a_name = (a_idx == XT_AR_SCRATCH_A3) ? 3 : 4;
        if (xtensa->scratch_ars[a_idx].intval && !xtensa->scratch_ars[ar_idx].intval) {
                LOG_DEBUG("AR conflict: a%d -> ar%d", a_name, j - XT_REG_IDX_AR0);
                memcpy(reg_list[j].value, reg_list[i].value, sizeof(xtensa_reg_val_t));
        } else {
                LOG_DEBUG("AR conflict: ar%d -> a%d", j - XT_REG_IDX_AR0, a_name);
                memcpy(reg_list[i].value, reg_list[j].value, sizeof(xtensa_reg_val_t));
        }
        return xtensa->scratch_ars[a_idx].intval && xtensa->scratch_ars[ar_idx].intval;
}

static int xtensa_write_dirty_registers(struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        int res;
        xtensa_reg_val_t regval, windowbase = 0;
        bool scratch_reg_dirty = false, delay_cpenable = false;
        struct reg *reg_list = xtensa->core_cache->reg_list;
        unsigned int reg_list_size = xtensa->core_cache->num_regs;
        bool preserve_a3 = false;
        uint8_t a3_buf[4];
        xtensa_reg_val_t a3 = 0, woe;

        LOG_TARGET_DEBUG(target, "start");

        /* We need to write the dirty registers in the cache list back to the processor.
         * Start by writing the SFR/user registers. */
        for (unsigned int i = 0; i < reg_list_size; i++) {
                struct xtensa_reg_desc *rlist = (i < XT_NUM_REGS) ? xtensa_regs : xtensa->optregs;
                unsigned int ridx = (i < XT_NUM_REGS) ? i : i - XT_NUM_REGS;
                if (reg_list[i].dirty) {
                        if (rlist[ridx].type == XT_REG_SPECIAL ||
                                rlist[ridx].type == XT_REG_USER ||
                                rlist[ridx].type == XT_REG_FR) {
                                scratch_reg_dirty = true;
                                if (i == XT_REG_IDX_CPENABLE) {
                                        delay_cpenable = true;
                                        continue;
                                }
                                regval = xtensa_reg_get(target, i);
                                LOG_TARGET_DEBUG(target, "Writing back reg %s (%d) val %08" PRIX32,
                                        reg_list[i].name,
                                        rlist[ridx].reg_num,
                                        regval);
                                xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, regval);
                                xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));
                                if (reg_list[i].exist) {
                                        unsigned int reg_num = rlist[ridx].reg_num;
                                        if (rlist[ridx].type == XT_REG_USER) {
                                                xtensa_queue_exec_ins(xtensa, XT_INS_WUR(xtensa, reg_num, XT_REG_A3));
                                        } else if (rlist[ridx].type == XT_REG_FR) {
                                                xtensa_queue_exec_ins(xtensa, XT_INS_WFR(xtensa, reg_num, XT_REG_A3));
                                        } else {/*SFR */
                                                if (reg_num == XT_PC_REG_NUM_VIRTUAL)
                                                        /* reg number of PC for debug interrupt depends on NDEBUGLEVEL
                                                         **/
                                                        reg_num =
                                                                (XT_EPC_REG_NUM_BASE +
                                                                xtensa->core_config->debug.irq_level);
                                                xtensa_queue_exec_ins(xtensa, XT_INS_WSR(xtensa, reg_num, XT_REG_A3));
                                        }
                                }
                                reg_list[i].dirty = false;
                        }
                }
        }
        if (scratch_reg_dirty)
                xtensa_mark_register_dirty(xtensa, XT_REG_IDX_A3);
        if (delay_cpenable) {
                regval = xtensa_reg_get(target, XT_REG_IDX_CPENABLE);
                LOG_TARGET_DEBUG(target, "Writing back reg cpenable (224) val %08" PRIX32, regval);
                xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, regval);
                xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));
                xtensa_queue_exec_ins(xtensa, XT_INS_WSR(xtensa,
                                xtensa_regs[XT_REG_IDX_CPENABLE].reg_num,
                                XT_REG_A3));
                reg_list[XT_REG_IDX_CPENABLE].dirty = false;
        }

        preserve_a3 = (xtensa->core_config->windowed);
        if (preserve_a3) {
                /* Save (windowed) A3 for scratch use */
                xtensa_queue_exec_ins(xtensa, XT_INS_WSR(xtensa, XT_SR_DDR, XT_REG_A3));
                xtensa_queue_dbg_reg_read(xtensa, XDMREG_DDR, a3_buf);
                res = xtensa_dm_queue_execute(&xtensa->dbg_mod);
                if (res != ERROR_OK)
                        return res;
                xtensa_core_status_check(target);
                a3 = buf_get_u32(a3_buf, 0, 32);
        }

        if (xtensa->core_config->windowed) {
                res = xtensa_window_state_save(target, &woe);
                if (res != ERROR_OK)
                        return res;
                /* Grab the windowbase, we need it. */
                windowbase = xtensa_reg_get(target, XT_REG_IDX_WINDOWBASE);
                /* Check if there are mismatches between the ARx and corresponding Ax registers.
                 * When the user sets a register on a windowed config, xt-gdb may set the ARx
                 * register directly.  Thus we take ARx as priority over Ax if both are dirty
                 * and it's unclear if the user set one over the other explicitly.
                 */
                for (unsigned int i = XT_REG_IDX_A0; i <= XT_REG_IDX_A15; i++) {
                        unsigned int j = xtensa_windowbase_offset_to_canonical(xtensa, i, windowbase);
                        if (reg_list[i].dirty && reg_list[j].dirty) {
                                if (memcmp(reg_list[i].value, reg_list[j].value, sizeof(xtensa_reg_val_t)) != 0) {
                                        bool show_warning = true;
                                        if (i == XT_REG_IDX_A3)
                                                show_warning = xtensa_scratch_regs_fixup(xtensa,
                                                        reg_list, i, j, XT_AR_SCRATCH_A3, XT_AR_SCRATCH_AR3);
                                        else if (i == XT_REG_IDX_A4)
                                                show_warning = xtensa_scratch_regs_fixup(xtensa,
                                                        reg_list, i, j, XT_AR_SCRATCH_A4, XT_AR_SCRATCH_AR4);
                                        if (show_warning)
                                                LOG_WARNING(
                                                        "Warning: Both A%d [0x%08" PRIx32
                                                        "] as well as its underlying physical register "
                                                        "(AR%d) [0x%08" PRIx32 "] are dirty and differ in value",
                                                        i - XT_REG_IDX_A0,
                                                        buf_get_u32(reg_list[i].value, 0, 32),
                                                        j - XT_REG_IDX_AR0,
                                                        buf_get_u32(reg_list[j].value, 0, 32));
                                }
                        }
                }
        }

        /* Write A0-A16. */
        for (unsigned int i = 0; i < 16; i++) {
                if (reg_list[XT_REG_IDX_A0 + i].dirty) {
                        regval = xtensa_reg_get(target, XT_REG_IDX_A0 + i);
                        LOG_TARGET_DEBUG(target, "Writing back reg %s value %08" PRIX32 ", num =%i",
                                xtensa_regs[XT_REG_IDX_A0 + i].name,
                                regval,
                                xtensa_regs[XT_REG_IDX_A0 + i].reg_num);
                        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, regval);
                        xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, i));
                        reg_list[XT_REG_IDX_A0 + i].dirty = false;
                        if (i == 3) {
                                /* Avoid stomping A3 during restore at end of function */
                                a3 = regval;
                        }
                }
        }

        if (xtensa->core_config->windowed) {
                /* Now write AR registers */
                for (unsigned int j = 0; j < XT_REG_IDX_ARLAST; j += 16) {
                        /* Write the 16 registers we can see */
                        for (unsigned int i = 0; i < 16; i++) {
                                if (i + j < xtensa->core_config->aregs_num) {
                                        enum xtensa_reg_id realadr =
                                                xtensa_windowbase_offset_to_canonical(xtensa, XT_REG_IDX_AR0 + i + j,
                                                windowbase);
                                        /* Write back any dirty un-windowed registers */
                                        if (reg_list[realadr].dirty) {
                                                regval = xtensa_reg_get(target, realadr);
                                                LOG_TARGET_DEBUG(
                                                        target,
                                                        "Writing back reg %s value %08" PRIX32 ", num =%i",
                                                        xtensa_regs[realadr].name,
                                                        regval,
                                                        xtensa_regs[realadr].reg_num);
                                                xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, regval);
                                                xtensa_queue_exec_ins(xtensa,
                                                        XT_INS_RSR(xtensa, XT_SR_DDR,
                                                                xtensa_regs[XT_REG_IDX_AR0 + i].reg_num));
                                                reg_list[realadr].dirty = false;
                                                if ((i + j) == 3)
                                                        /* Avoid stomping AR during A3 restore at end of function */
                                                        a3 = regval;
                                        }
                                }
                        }
                        /*Now rotate the window so we'll see the next 16 registers. The final rotate
                         * will wraparound, */
                        /*leaving us in the state we were. */
                        xtensa_queue_exec_ins(xtensa, XT_INS_ROTW(xtensa, 4));
                }

                xtensa_window_state_restore(target, woe);

                for (enum xtensa_ar_scratch_set_e s = 0; s < XT_AR_SCRATCH_NUM; s++)
                        xtensa->scratch_ars[s].intval = false;
        }

        if (preserve_a3) {
                xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, a3);
                xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));
        }

        res = xtensa_dm_queue_execute(&xtensa->dbg_mod);
        xtensa_core_status_check(target);

        return res;
}

static inline bool xtensa_is_stopped(struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        return xtensa->dbg_mod.core_status.dsr & OCDDSR_STOPPED;
}

int xtensa_examine(struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        unsigned int cmd = PWRCTL_DEBUGWAKEUP(xtensa) | PWRCTL_MEMWAKEUP(xtensa) | PWRCTL_COREWAKEUP(xtensa);

        LOG_DEBUG("coreid = %d", target->coreid);

        if (xtensa->core_config->core_type == XT_UNDEF) {
                LOG_ERROR("XTensa core not configured; is xtensa-core-openocd.cfg missing?");
                return ERROR_FAIL;
        }

        xtensa_queue_pwr_reg_write(xtensa, XDMREG_PWRCTL, cmd);
        xtensa_queue_pwr_reg_write(xtensa, XDMREG_PWRCTL, cmd | PWRCTL_JTAGDEBUGUSE(xtensa));
        xtensa_dm_queue_enable(&xtensa->dbg_mod);
        xtensa_dm_queue_tdi_idle(&xtensa->dbg_mod);
        int res = xtensa_dm_queue_execute(&xtensa->dbg_mod);
        if (res != ERROR_OK)
                return res;
        if (!xtensa_dm_is_online(&xtensa->dbg_mod)) {
                LOG_ERROR("Unexpected OCD_ID = %08" PRIx32, xtensa->dbg_mod.device_id);
                return ERROR_TARGET_FAILURE;
        }
        LOG_DEBUG("OCD_ID = %08" PRIx32, xtensa->dbg_mod.device_id);
        target_set_examined(target);
        xtensa_smpbreak_write(xtensa, xtensa->smp_break);
        return ERROR_OK;
}

int xtensa_wakeup(struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        unsigned int cmd = PWRCTL_DEBUGWAKEUP(xtensa) | PWRCTL_MEMWAKEUP(xtensa) | PWRCTL_COREWAKEUP(xtensa);

        if (xtensa->reset_asserted)
                cmd |= PWRCTL_CORERESET(xtensa);
        xtensa_queue_pwr_reg_write(xtensa, XDMREG_PWRCTL, cmd);
        /* TODO: can we join this with the write above? */
        xtensa_queue_pwr_reg_write(xtensa, XDMREG_PWRCTL, cmd | PWRCTL_JTAGDEBUGUSE(xtensa));
        xtensa_dm_queue_tdi_idle(&xtensa->dbg_mod);
        return xtensa_dm_queue_execute(&xtensa->dbg_mod);
}

int xtensa_smpbreak_write(struct xtensa *xtensa, uint32_t set)
{
        uint32_t dsr_data = 0x00110000;
        uint32_t clear = (set | OCDDCR_ENABLEOCD) ^
                (OCDDCR_BREAKINEN | OCDDCR_BREAKOUTEN | OCDDCR_RUNSTALLINEN |
                OCDDCR_DEBUGMODEOUTEN | OCDDCR_ENABLEOCD);

        LOG_TARGET_DEBUG(xtensa->target, "write smpbreak set=0x%" PRIx32 " clear=0x%" PRIx32, set, clear);
        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DCRSET, set | OCDDCR_ENABLEOCD);
        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DCRCLR, clear);
        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DSR, dsr_data);
        xtensa_dm_queue_tdi_idle(&xtensa->dbg_mod);
        return xtensa_dm_queue_execute(&xtensa->dbg_mod);
}

int xtensa_smpbreak_set(struct target *target, uint32_t set)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        int res = ERROR_OK;

        xtensa->smp_break = set;
        if (target_was_examined(target))
                res = xtensa_smpbreak_write(xtensa, xtensa->smp_break);
        LOG_TARGET_DEBUG(target, "set smpbreak=%" PRIx32 ", state=%i", set, target->state);
        return res;
}

int xtensa_smpbreak_read(struct xtensa *xtensa, uint32_t *val)
{
        uint8_t dcr_buf[sizeof(uint32_t)];

        xtensa_queue_dbg_reg_read(xtensa, XDMREG_DCRSET, dcr_buf);
        xtensa_dm_queue_tdi_idle(&xtensa->dbg_mod);
        int res = xtensa_dm_queue_execute(&xtensa->dbg_mod);
        *val = buf_get_u32(dcr_buf, 0, 32);

        return res;
}

int xtensa_smpbreak_get(struct target *target, uint32_t *val)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        *val = xtensa->smp_break;
        return ERROR_OK;
}

static inline xtensa_reg_val_t xtensa_reg_get_value(struct reg *reg)
{
        return buf_get_u32(reg->value, 0, 32);
}

static inline void xtensa_reg_set_value(struct reg *reg, xtensa_reg_val_t value)
{
        buf_set_u32(reg->value, 0, 32, value);
        reg->dirty = true;
}

int xtensa_core_status_check(struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        int res, needclear = 0;

        xtensa_dm_core_status_read(&xtensa->dbg_mod);
        xtensa_dsr_t dsr = xtensa_dm_core_status_get(&xtensa->dbg_mod);
        LOG_TARGET_DEBUG(target, "DSR (%08" PRIX32 ")", dsr);
        if (dsr & OCDDSR_EXECBUSY) {
                if (!xtensa->suppress_dsr_errors)
                        LOG_TARGET_ERROR(target, "DSR (%08" PRIX32 ") indicates target still busy!", dsr);
                needclear = 1;
        }
        if (dsr & OCDDSR_EXECEXCEPTION) {
                if (!xtensa->suppress_dsr_errors)
                        LOG_TARGET_ERROR(target,
                                "DSR (%08" PRIX32 ") indicates DIR instruction generated an exception!",
                                dsr);
                needclear = 1;
        }
        if (dsr & OCDDSR_EXECOVERRUN) {
                if (!xtensa->suppress_dsr_errors)
                        LOG_TARGET_ERROR(target,
                                "DSR (%08" PRIX32 ") indicates DIR instruction generated an overrun!",
                                dsr);
                needclear = 1;
        }
        if (needclear) {
                res = xtensa_dm_core_status_clear(&xtensa->dbg_mod,
                        OCDDSR_EXECEXCEPTION | OCDDSR_EXECOVERRUN);
                if (res != ERROR_OK && !xtensa->suppress_dsr_errors)
                        LOG_TARGET_ERROR(target, "clearing DSR failed!");
                return ERROR_FAIL;
        }
        return ERROR_OK;
}

xtensa_reg_val_t xtensa_reg_get(struct target *target, enum xtensa_reg_id reg_id)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        struct reg *reg = &xtensa->core_cache->reg_list[reg_id];
        return xtensa_reg_get_value(reg);
}

void xtensa_reg_set(struct target *target, enum xtensa_reg_id reg_id, xtensa_reg_val_t value)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        struct reg *reg = &xtensa->core_cache->reg_list[reg_id];
        if (xtensa_reg_get_value(reg) == value)
                return;
        xtensa_reg_set_value(reg, value);
}

/* Set Ax (XT_REG_RELGEN) register along with its underlying ARx (XT_REG_GENERAL) */
void xtensa_reg_set_deep_relgen(struct target *target, enum xtensa_reg_id a_idx, xtensa_reg_val_t value)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        uint32_t windowbase = (xtensa->core_config->windowed ?
                xtensa_reg_get(target, XT_REG_IDX_WINDOWBASE) : 0);
        int ar_idx = xtensa_windowbase_offset_to_canonical(xtensa, a_idx, windowbase);
        xtensa_reg_set(target, a_idx, value);
        xtensa_reg_set(target, ar_idx, value);
}

/* Read cause for entering halted state; return bitmask in DEBUGCAUSE_* format */
uint32_t xtensa_cause_get(struct target *target)
{
        return xtensa_reg_get(target, XT_REG_IDX_DEBUGCAUSE);
}

void xtensa_cause_clear(struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        xtensa_reg_set(target, XT_REG_IDX_DEBUGCAUSE, 0);
        xtensa->core_cache->reg_list[XT_REG_IDX_DEBUGCAUSE].dirty = false;
}

int xtensa_assert_reset(struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);

        LOG_TARGET_DEBUG(target, "target_number=%i, begin", target->target_number);
        xtensa_queue_pwr_reg_write(xtensa,
                XDMREG_PWRCTL,
                PWRCTL_JTAGDEBUGUSE(xtensa) | PWRCTL_DEBUGWAKEUP(xtensa) | PWRCTL_MEMWAKEUP(xtensa) |
                PWRCTL_COREWAKEUP(xtensa) | PWRCTL_CORERESET(xtensa));
        xtensa_dm_queue_tdi_idle(&xtensa->dbg_mod);
        int res = xtensa_dm_queue_execute(&xtensa->dbg_mod);
        if (res != ERROR_OK)
                return res;

        /* registers are now invalid */
        xtensa->reset_asserted = true;
        register_cache_invalidate(xtensa->core_cache);
        target->state = TARGET_RESET;
        return ERROR_OK;
}

int xtensa_deassert_reset(struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);

        LOG_TARGET_DEBUG(target, "halt=%d", target->reset_halt);
        if (target->reset_halt)
                xtensa_queue_dbg_reg_write(xtensa,
                        XDMREG_DCRSET,
                        OCDDCR_ENABLEOCD | OCDDCR_DEBUGINTERRUPT);
        xtensa_queue_pwr_reg_write(xtensa,
                XDMREG_PWRCTL,
                PWRCTL_JTAGDEBUGUSE(xtensa) | PWRCTL_DEBUGWAKEUP(xtensa) | PWRCTL_MEMWAKEUP(xtensa) |
                PWRCTL_COREWAKEUP(xtensa));
        xtensa_dm_queue_tdi_idle(&xtensa->dbg_mod);
        int res = xtensa_dm_queue_execute(&xtensa->dbg_mod);
        if (res != ERROR_OK)
                return res;
        target->state = TARGET_RUNNING;
        xtensa->reset_asserted = false;
        return res;
}

int xtensa_soft_reset_halt(struct target *target)
{
        LOG_TARGET_DEBUG(target, "begin");
        return xtensa_assert_reset(target);
}

int xtensa_fetch_all_regs(struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        struct reg *reg_list = xtensa->core_cache->reg_list;
        unsigned int reg_list_size = xtensa->core_cache->num_regs;
        xtensa_reg_val_t cpenable = 0, windowbase = 0, a3;
        uint32_t woe;
        uint8_t a3_buf[4];
        bool debug_dsrs = !xtensa->regs_fetched || LOG_LEVEL_IS(LOG_LVL_DEBUG);

        union xtensa_reg_val_u *regvals = calloc(reg_list_size, sizeof(*regvals));
        if (!regvals) {
                LOG_TARGET_ERROR(target, "unable to allocate memory for regvals!");
                return ERROR_FAIL;
        }
        union xtensa_reg_val_u *dsrs = calloc(reg_list_size, sizeof(*dsrs));
        if (!dsrs) {
                LOG_TARGET_ERROR(target, "unable to allocate memory for dsrs!");
                free(regvals);
                return ERROR_FAIL;
        }

        LOG_TARGET_DEBUG(target, "start");

        /* Save (windowed) A3 so cache matches physical AR3; A3 usable as scratch */
        xtensa_queue_exec_ins(xtensa, XT_INS_WSR(xtensa, XT_SR_DDR, XT_REG_A3));
        xtensa_queue_dbg_reg_read(xtensa, XDMREG_DDR, a3_buf);
        int res = xtensa_window_state_save(target, &woe);
        if (res != ERROR_OK)
                goto xtensa_fetch_all_regs_done;

        /* Assume the CPU has just halted. We now want to fill the register cache with all the
         * register contents GDB needs. For speed, we pipeline all the read operations, execute them
         * in one go, then sort everything out from the regvals variable. */

        /* Start out with AREGS; we can reach those immediately. Grab them per 16 registers. */
        for (unsigned int j = 0; j < XT_AREGS_NUM_MAX; j += 16) {
                /*Grab the 16 registers we can see */
                for (unsigned int i = 0; i < 16; i++) {
                        if (i + j < xtensa->core_config->aregs_num) {
                                xtensa_queue_exec_ins(xtensa,
                                        XT_INS_WSR(xtensa, XT_SR_DDR, xtensa_regs[XT_REG_IDX_AR0 + i].reg_num));
                                xtensa_queue_dbg_reg_read(xtensa, XDMREG_DDR,
                                        regvals[XT_REG_IDX_AR0 + i + j].buf);
                                if (debug_dsrs)
                                        xtensa_queue_dbg_reg_read(xtensa, XDMREG_DSR,
                                                dsrs[XT_REG_IDX_AR0 + i + j].buf);
                        }
                }
                if (xtensa->core_config->windowed)
                        /* Now rotate the window so we'll see the next 16 registers. The final rotate
                         * will wraparound, */
                        /* leaving us in the state we were. */
                        xtensa_queue_exec_ins(xtensa, XT_INS_ROTW(xtensa, 4));
        }
        xtensa_window_state_restore(target, woe);

        if (xtensa->core_config->coproc) {
                /* As the very first thing after AREGS, go grab CPENABLE */
                xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, xtensa_regs[XT_REG_IDX_CPENABLE].reg_num, XT_REG_A3));
                xtensa_queue_exec_ins(xtensa, XT_INS_WSR(xtensa, XT_SR_DDR, XT_REG_A3));
                xtensa_queue_dbg_reg_read(xtensa, XDMREG_DDR, regvals[XT_REG_IDX_CPENABLE].buf);
        }
        res = xtensa_dm_queue_execute(&xtensa->dbg_mod);
        if (res != ERROR_OK) {
                LOG_ERROR("Failed to read ARs (%d)!", res);
                goto xtensa_fetch_all_regs_done;
        }
        xtensa_core_status_check(target);

        a3 = buf_get_u32(a3_buf, 0, 32);

        if (xtensa->core_config->coproc) {
                cpenable = buf_get_u32(regvals[XT_REG_IDX_CPENABLE].buf, 0, 32);

                /* Enable all coprocessors (by setting all bits in CPENABLE) so we can read FP and user registers. */
                xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, 0xffffffff);
                xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));
                xtensa_queue_exec_ins(xtensa, XT_INS_WSR(xtensa, xtensa_regs[XT_REG_IDX_CPENABLE].reg_num, XT_REG_A3));

                /* Save CPENABLE; flag dirty later (when regcache updated) so original value is always restored */
                LOG_TARGET_DEBUG(target, "CPENABLE: was 0x%" PRIx32 ", all enabled", cpenable);
                xtensa_reg_set(target, XT_REG_IDX_CPENABLE, cpenable);
        }
        /* We're now free to use any of A0-A15 as scratch registers
         * Grab the SFRs and user registers first. We use A3 as a scratch register. */
        for (unsigned int i = 0; i < reg_list_size; i++) {
                struct xtensa_reg_desc *rlist = (i < XT_NUM_REGS) ? xtensa_regs : xtensa->optregs;
                unsigned int ridx = (i < XT_NUM_REGS) ? i : i - XT_NUM_REGS;
                if (xtensa_reg_is_readable(rlist[ridx].flags, cpenable) && rlist[ridx].exist) {
                        bool reg_fetched = true;
                        unsigned int reg_num = rlist[ridx].reg_num;
                        switch (rlist[ridx].type) {
                        case XT_REG_USER:
                                xtensa_queue_exec_ins(xtensa, XT_INS_RUR(xtensa, reg_num, XT_REG_A3));
                                break;
                        case XT_REG_FR:
                                xtensa_queue_exec_ins(xtensa, XT_INS_RFR(xtensa, reg_num, XT_REG_A3));
                                break;
                        case XT_REG_SPECIAL:
                                if (reg_num == XT_PC_REG_NUM_VIRTUAL) {
                                        /* reg number of PC for debug interrupt depends on NDEBUGLEVEL */
                                        reg_num = XT_EPC_REG_NUM_BASE + xtensa->core_config->debug.irq_level;
                                } else if (reg_num == xtensa_regs[XT_REG_IDX_PS].reg_num) {
                                        /* reg number of PS for debug interrupt depends on NDEBUGLEVEL */
                                        reg_num = XT_EPS_REG_NUM_BASE + xtensa->core_config->debug.irq_level;
                                } else if (reg_num == xtensa_regs[XT_REG_IDX_CPENABLE].reg_num) {
                                        /* CPENABLE already read/updated; don't re-read */
                                        reg_fetched = false;
                                        break;
                                }
                                xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, reg_num, XT_REG_A3));
                                break;
                        default:
                                reg_fetched = false;
                        }
                        if (reg_fetched) {
                                xtensa_queue_exec_ins(xtensa, XT_INS_WSR(xtensa, XT_SR_DDR, XT_REG_A3));
                                xtensa_queue_dbg_reg_read(xtensa, XDMREG_DDR, regvals[i].buf);
                                if (debug_dsrs)
                                        xtensa_queue_dbg_reg_read(xtensa, XDMREG_DSR, dsrs[i].buf);
                        }
                }
        }
        /* Ok, send the whole mess to the CPU. */
        res = xtensa_dm_queue_execute(&xtensa->dbg_mod);
        if (res != ERROR_OK) {
                LOG_ERROR("Failed to fetch AR regs!");
                goto xtensa_fetch_all_regs_done;
        }
        xtensa_core_status_check(target);

        if (debug_dsrs) {
                /* DSR checking: follows order in which registers are requested. */
                for (unsigned int i = 0; i < reg_list_size; i++) {
                        struct xtensa_reg_desc *rlist = (i < XT_NUM_REGS) ? xtensa_regs : xtensa->optregs;
                        unsigned int ridx = (i < XT_NUM_REGS) ? i : i - XT_NUM_REGS;
                        if (xtensa_reg_is_readable(rlist[ridx].flags, cpenable) && rlist[ridx].exist &&
                                (rlist[ridx].type != XT_REG_DEBUG) &&
                                (rlist[ridx].type != XT_REG_RELGEN) &&
                                (rlist[ridx].type != XT_REG_TIE) &&
                                (rlist[ridx].type != XT_REG_OTHER)) {
                                if (buf_get_u32(dsrs[i].buf, 0, 32) & OCDDSR_EXECEXCEPTION) {
                                        LOG_ERROR("Exception reading %s!", reg_list[i].name);
                                        res = ERROR_FAIL;
                                        goto xtensa_fetch_all_regs_done;
                                }
                        }
                }
        }

        if (xtensa->core_config->windowed)
                /* We need the windowbase to decode the general addresses. */
                windowbase = buf_get_u32(regvals[XT_REG_IDX_WINDOWBASE].buf, 0, 32);
        /* Decode the result and update the cache. */
        for (unsigned int i = 0; i < reg_list_size; i++) {
                struct xtensa_reg_desc *rlist = (i < XT_NUM_REGS) ? xtensa_regs : xtensa->optregs;
                unsigned int ridx = (i < XT_NUM_REGS) ? i : i - XT_NUM_REGS;
                if (xtensa_reg_is_readable(rlist[ridx].flags, cpenable) && rlist[ridx].exist) {
                        if ((xtensa->core_config->windowed) && (rlist[ridx].type == XT_REG_GENERAL)) {
                                /* The 64-value general register set is read from (windowbase) on down.
                                 * We need to get the real register address by subtracting windowbase and
                                 * wrapping around. */
                                enum xtensa_reg_id realadr = xtensa_canonical_to_windowbase_offset(xtensa, i,
                                        windowbase);
                                buf_cpy(regvals[realadr].buf, reg_list[i].value, reg_list[i].size);
                        } else if (rlist[ridx].type == XT_REG_RELGEN) {
                                buf_cpy(regvals[rlist[ridx].reg_num].buf, reg_list[i].value, reg_list[i].size);
                                if (xtensa_extra_debug_log) {
                                        xtensa_reg_val_t regval = buf_get_u32(regvals[rlist[ridx].reg_num].buf, 0, 32);
                                        LOG_DEBUG("%s = 0x%x", rlist[ridx].name, regval);
                                }
                        } else {
                                xtensa_reg_val_t regval = buf_get_u32(regvals[i].buf, 0, 32);
                                bool is_dirty = (i == XT_REG_IDX_CPENABLE);
                                if (xtensa_extra_debug_log)
                                        LOG_INFO("Register %s: 0x%X", reg_list[i].name, regval);
                                xtensa_reg_set(target, i, regval);
                                reg_list[i].dirty = is_dirty;   /*always do this _after_ xtensa_reg_set! */
                        }
                        reg_list[i].valid = true;
                } else {
                        if ((rlist[ridx].flags & XT_REGF_MASK) == XT_REGF_NOREAD) {
                                /* Report read-only registers all-zero but valid */
                                reg_list[i].valid = true;
                                xtensa_reg_set(target, i, 0);
                        } else {
                                reg_list[i].valid = false;
                        }
                }
        }

        if (xtensa->core_config->windowed) {
                /* We have used A3 as a scratch register.
                 * Windowed configs: restore A3's AR (XT_REG_GENERAL) and and flag for write-back.
                 */
                enum xtensa_reg_id ar3_idx = xtensa_windowbase_offset_to_canonical(xtensa, XT_REG_IDX_A3, windowbase);
                xtensa_reg_set(target, ar3_idx, a3);
                xtensa_mark_register_dirty(xtensa, ar3_idx);

                /* Reset scratch_ars[] on fetch.  .chrval tracks AR mapping and changes w/ window */
                sprintf(xtensa->scratch_ars[XT_AR_SCRATCH_AR3].chrval, "ar%d", ar3_idx - XT_REG_IDX_AR0);
                enum xtensa_reg_id ar4_idx = xtensa_windowbase_offset_to_canonical(xtensa, XT_REG_IDX_A4, windowbase);
                sprintf(xtensa->scratch_ars[XT_AR_SCRATCH_AR4].chrval, "ar%d", ar4_idx - XT_REG_IDX_AR0);
                for (enum xtensa_ar_scratch_set_e s = 0; s < XT_AR_SCRATCH_NUM; s++)
                        xtensa->scratch_ars[s].intval = false;
        }

        /* We have used A3 (XT_REG_RELGEN) as a scratch register.  Restore and flag for write-back. */
        xtensa_reg_set(target, XT_REG_IDX_A3, a3);
        xtensa_mark_register_dirty(xtensa, XT_REG_IDX_A3);
        xtensa->regs_fetched = true;
xtensa_fetch_all_regs_done:
        free(regvals);
        free(dsrs);
        return res;
}

int xtensa_get_gdb_reg_list(struct target *target,
        struct reg **reg_list[],
        int *reg_list_size,
        enum target_register_class reg_class)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        unsigned int num_regs;

        if (reg_class == REG_CLASS_GENERAL) {
                if ((xtensa->genpkt_regs_num == 0) || !xtensa->contiguous_regs_list) {
                        LOG_ERROR("reg_class %d unhandled; 'xtgregs' not found", reg_class);
                        return ERROR_FAIL;
                }
                num_regs = xtensa->genpkt_regs_num;
        } else {
                /* Determine whether to return a contiguous or sparse register map */
                num_regs = xtensa->regmap_contiguous ? xtensa->total_regs_num : xtensa->dbregs_num;
        }

        LOG_DEBUG("reg_class=%i, num_regs=%d", (int)reg_class, num_regs);

        *reg_list = calloc(num_regs, sizeof(struct reg *));
        if (!*reg_list)
                return ERROR_FAIL;

        *reg_list_size = num_regs;
        if (xtensa->regmap_contiguous) {
                assert((num_regs <= xtensa->total_regs_num) && "contiguous regmap size internal error!");
                for (unsigned int i = 0; i < num_regs; i++)
                        (*reg_list)[i] = xtensa->contiguous_regs_list[i];
                return ERROR_OK;
        }

        for (unsigned int i = 0; i < num_regs; i++)
                (*reg_list)[i] = (struct reg *)&xtensa->empty_regs[i];
        unsigned int k = 0;
        for (unsigned int i = 0; i < xtensa->core_cache->num_regs && k < num_regs; i++) {
                if (xtensa->core_cache->reg_list[i].exist) {
                        struct xtensa_reg_desc *rlist = (i < XT_NUM_REGS) ? xtensa_regs : xtensa->optregs;
                        unsigned int ridx = (i < XT_NUM_REGS) ? i : i - XT_NUM_REGS;
                        int sparse_idx = rlist[ridx].dbreg_num;
                        if (i == XT_REG_IDX_PS) {
                                if (xtensa->eps_dbglevel_idx == 0) {
                                        LOG_ERROR("eps_dbglevel_idx not set\n");
                                        return ERROR_FAIL;
                                }
                                (*reg_list)[sparse_idx] = &xtensa->core_cache->reg_list[xtensa->eps_dbglevel_idx];
                                if (xtensa_extra_debug_log)
                                        LOG_DEBUG("SPARSE GDB reg 0x%x getting EPS%d 0x%x",
                                                sparse_idx, xtensa->core_config->debug.irq_level,
                                                xtensa_reg_get_value((*reg_list)[sparse_idx]));
                        } else if (rlist[ridx].type == XT_REG_RELGEN) {
                                (*reg_list)[sparse_idx - XT_REG_IDX_ARFIRST] = &xtensa->core_cache->reg_list[i];
                        } else {
                                (*reg_list)[sparse_idx] = &xtensa->core_cache->reg_list[i];
                        }
                        if (i == XT_REG_IDX_PC)
                                /* Make a duplicate copy of PC for external access */
                                (*reg_list)[XT_PC_DBREG_NUM_BASE] = &xtensa->core_cache->reg_list[i];
                        k++;
                }
        }

        if (k == num_regs)
                LOG_ERROR("SPARSE GDB reg list full (size %d)", k);

        return ERROR_OK;
}

int xtensa_mmu_is_enabled(struct target *target, int *enabled)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        *enabled = xtensa->core_config->mmu.itlb_entries_count > 0 ||
                xtensa->core_config->mmu.dtlb_entries_count > 0;
        return ERROR_OK;
}

int xtensa_halt(struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);

        LOG_TARGET_DEBUG(target, "start");
        if (target->state == TARGET_HALTED) {
                LOG_TARGET_DEBUG(target, "target was already halted");
                return ERROR_OK;
        }
        /* First we have to read dsr and check if the target stopped */
        int res = xtensa_dm_core_status_read(&xtensa->dbg_mod);
        if (res != ERROR_OK) {
                LOG_TARGET_ERROR(target, "Failed to read core status!");
                return res;
        }
        LOG_TARGET_DEBUG(target, "Core status 0x%" PRIx32, xtensa_dm_core_status_get(&xtensa->dbg_mod));
        if (!xtensa_is_stopped(target)) {
                xtensa_queue_dbg_reg_write(xtensa, XDMREG_DCRSET, OCDDCR_ENABLEOCD | OCDDCR_DEBUGINTERRUPT);
                xtensa_dm_queue_tdi_idle(&xtensa->dbg_mod);
                res = xtensa_dm_queue_execute(&xtensa->dbg_mod);
                if (res != ERROR_OK)
                        LOG_TARGET_ERROR(target, "Failed to set OCDDCR_DEBUGINTERRUPT. Can't halt.");
        }

        return res;
}

int xtensa_prepare_resume(struct target *target,
        int current,
        target_addr_t address,
        int handle_breakpoints,
        int debug_execution)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        uint32_t bpena = 0;

        LOG_TARGET_DEBUG(target,
                "current=%d address=" TARGET_ADDR_FMT ", handle_breakpoints=%i, debug_execution=%i)",
                current,
                address,
                handle_breakpoints,
                debug_execution);

        if (target->state != TARGET_HALTED) {
                LOG_TARGET_WARNING(target, "target not halted");
                return ERROR_TARGET_NOT_HALTED;
        }

        if (address && !current) {
                xtensa_reg_set(target, XT_REG_IDX_PC, address);
        } else {
                uint32_t cause = xtensa_cause_get(target);
                LOG_TARGET_DEBUG(target, "DEBUGCAUSE 0x%x (watchpoint %lu) (break %lu)",
                        cause, (cause & DEBUGCAUSE_DB), (cause & (DEBUGCAUSE_BI | DEBUGCAUSE_BN)));
                if (cause & DEBUGCAUSE_DB)
                        /* We stopped due to a watchpoint. We can't just resume executing the
                         * instruction again because */
                        /* that would trigger the watchpoint again. To fix this, we single-step,
                         * which ignores watchpoints. */
                        xtensa_do_step(target, current, address, handle_breakpoints);
                if (cause & (DEBUGCAUSE_BI | DEBUGCAUSE_BN))
                        /* We stopped due to a break instruction. We can't just resume executing the
                         * instruction again because */
                        /* that would trigger the break again. To fix this, we single-step, which
                         * ignores break. */
                        xtensa_do_step(target, current, address, handle_breakpoints);
        }

        /* Write back hw breakpoints. Current FreeRTOS SMP code can set a hw breakpoint on an
         * exception; we need to clear that and return to the breakpoints gdb has set on resume. */
        for (unsigned int slot = 0; slot < xtensa->core_config->debug.ibreaks_num; slot++) {
                if (xtensa->hw_brps[slot]) {
                        /* Write IBREAKA[slot] and set bit #slot in IBREAKENABLE */
                        xtensa_reg_set(target, XT_REG_IDX_IBREAKA0 + slot, xtensa->hw_brps[slot]->address);
                        bpena |= BIT(slot);
                }
        }
        xtensa_reg_set(target, XT_REG_IDX_IBREAKENABLE, bpena);

        /* Here we write all registers to the targets */
        int res = xtensa_write_dirty_registers(target);
        if (res != ERROR_OK)
                LOG_TARGET_ERROR(target, "Failed to write back register cache.");
        return res;
}

int xtensa_do_resume(struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);

        LOG_TARGET_DEBUG(target, "start");

        xtensa_queue_exec_ins(xtensa, XT_INS_RFDO(xtensa));
        int res = xtensa_dm_queue_execute(&xtensa->dbg_mod);
        if (res != ERROR_OK) {
                LOG_TARGET_ERROR(target, "Failed to exec RFDO %d!", res);
                return res;
        }
        xtensa_core_status_check(target);
        return ERROR_OK;
}

int xtensa_resume(struct target *target,
        int current,
        target_addr_t address,
        int handle_breakpoints,
        int debug_execution)
{
        LOG_TARGET_DEBUG(target, "start");
        int res = xtensa_prepare_resume(target, current, address, handle_breakpoints, debug_execution);
        if (res != ERROR_OK) {
                LOG_TARGET_ERROR(target, "Failed to prepare for resume!");
                return res;
        }
        res = xtensa_do_resume(target);
        if (res != ERROR_OK) {
                LOG_TARGET_ERROR(target, "Failed to resume!");
                return res;
        }

        target->debug_reason = DBG_REASON_NOTHALTED;
        if (!debug_execution)
                target->state = TARGET_RUNNING;
        else
                target->state = TARGET_DEBUG_RUNNING;

        target_call_event_callbacks(target, TARGET_EVENT_RESUMED);

        return ERROR_OK;
}

static bool xtensa_pc_in_winexc(struct target *target, target_addr_t pc)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        uint8_t insn_buf[XT_ISNS_SZ_MAX];
        int err = xtensa_read_buffer(target, pc, sizeof(insn_buf), insn_buf);
        if (err != ERROR_OK)
                return false;

        xtensa_insn_t insn = buf_get_u32(insn_buf, 0, 24);
        xtensa_insn_t masked = insn & XT_INS_L32E_S32E_MASK(xtensa);
        if (masked == XT_INS_L32E(xtensa, 0, 0, 0) || masked == XT_INS_S32E(xtensa, 0, 0, 0))
                return true;

        masked = insn & XT_INS_RFWO_RFWU_MASK(xtensa);
        if (masked == XT_INS_RFWO(xtensa) || masked == XT_INS_RFWU(xtensa))
                return true;

        return false;
}

int xtensa_do_step(struct target *target, int current, target_addr_t address, int handle_breakpoints)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        int res;
        const uint32_t icount_val = -2; /* ICOUNT value to load for 1 step */
        xtensa_reg_val_t dbreakc[XT_WATCHPOINTS_NUM_MAX];
        xtensa_reg_val_t icountlvl, cause;
        xtensa_reg_val_t oldps, oldpc, cur_pc;
        bool ps_lowered = false;

        LOG_TARGET_DEBUG(target, "current=%d, address=" TARGET_ADDR_FMT ", handle_breakpoints=%i",
                current, address, handle_breakpoints);

        if (target->state != TARGET_HALTED) {
                LOG_TARGET_WARNING(target, "target not halted");
                return ERROR_TARGET_NOT_HALTED;
        }

        if (xtensa->eps_dbglevel_idx == 0) {
                LOG_ERROR("eps_dbglevel_idx not set\n");
                return ERROR_FAIL;
        }

        /* Save old ps (EPS[dbglvl] on LX), pc */
        oldps = xtensa_reg_get(target, xtensa->eps_dbglevel_idx);
        oldpc = xtensa_reg_get(target, XT_REG_IDX_PC);

        cause = xtensa_cause_get(target);
        LOG_TARGET_DEBUG(target, "oldps=%" PRIx32 ", oldpc=%" PRIx32 " dbg_cause=%" PRIx32 " exc_cause=%" PRIx32,
                oldps,
                oldpc,
                cause,
                xtensa_reg_get(target, XT_REG_IDX_EXCCAUSE));
        if (handle_breakpoints && (cause & (DEBUGCAUSE_BI | DEBUGCAUSE_BN))) {
                /* handle hard-coded SW breakpoints (e.g. syscalls) */
                LOG_TARGET_DEBUG(target, "Increment PC to pass break instruction...");
                xtensa_cause_clear(target);     /* so we don't recurse into the same routine */
                /* pretend that we have stepped */
                if (cause & DEBUGCAUSE_BI)
                        xtensa_reg_set(target, XT_REG_IDX_PC, oldpc + 3);       /* PC = PC+3 */
                else
                        xtensa_reg_set(target, XT_REG_IDX_PC, oldpc + 2);       /* PC = PC+2 */
                return ERROR_OK;
        }

        /* Xtensa LX has an ICOUNTLEVEL register which sets the maximum interrupt level
         * at which the instructions are to be counted while stepping.
         *
         * For example, if we need to step by 2 instructions, and an interrupt occurs
         * in between, the processor will trigger the interrupt and halt after the 2nd
         * instruction within the interrupt vector and/or handler.
         *
         * However, sometimes we don't want the interrupt handlers to be executed at all
         * while stepping through the code. In this case (XT_STEPPING_ISR_OFF),
         * ICOUNTLEVEL can be lowered to the executing code's (level + 1) to prevent ISR
         * code from being counted during stepping.  Note that C exception handlers must
         * run at level 0 and hence will be counted and stepped into, should one occur.
         *
         * TODO: Certain instructions should never be single-stepped and should instead
         * be emulated (per DUG): RSIL >= DBGLEVEL, RSR/WSR [ICOUNT|ICOUNTLEVEL], and
         * RFI >= DBGLEVEL.
         */
        if (xtensa->stepping_isr_mode == XT_STEPPING_ISR_OFF) {
                if (!xtensa->core_config->high_irq.enabled) {
                        LOG_TARGET_WARNING(
                                target,
                                "disabling IRQs while stepping is not implemented w/o high prio IRQs option!");
                        return ERROR_FAIL;
                }
                /* Update ICOUNTLEVEL accordingly */
                icountlvl = MIN((oldps & 0xF) + 1, xtensa->core_config->debug.irq_level);
        } else {
                icountlvl = xtensa->core_config->debug.irq_level;
        }

        if (cause & DEBUGCAUSE_DB) {
                /* We stopped due to a watchpoint. We can't just resume executing the instruction again because
                 * that would trigger the watchpoint again. To fix this, we remove watchpoints,single-step and
                 * re-enable the watchpoint. */
                LOG_TARGET_DEBUG(
                        target,
                        "Single-stepping to get past instruction that triggered the watchpoint...");
                xtensa_cause_clear(target);     /* so we don't recurse into the same routine */
                /* Save all DBREAKCx registers and set to 0 to disable watchpoints */
                for (unsigned int slot = 0; slot < xtensa->core_config->debug.dbreaks_num; slot++) {
                        dbreakc[slot] = xtensa_reg_get(target, XT_REG_IDX_DBREAKC0 + slot);
                        xtensa_reg_set(target, XT_REG_IDX_DBREAKC0 + slot, 0);
                }
        }

        if (!handle_breakpoints && (cause & (DEBUGCAUSE_BI | DEBUGCAUSE_BN)))
                /* handle normal SW breakpoint */
                xtensa_cause_clear(target);     /* so we don't recurse into the same routine */
        if ((oldps & 0xf) >= icountlvl) {
                /* Lower interrupt level to allow stepping, but flag eps[dbglvl] to be restored */
                ps_lowered = true;
                uint32_t newps = (oldps & ~0xf) | (icountlvl - 1);
                xtensa_reg_set(target, xtensa->eps_dbglevel_idx, newps);
                LOG_TARGET_DEBUG(target,
                        "Lowering PS.INTLEVEL to allow stepping: %s <- 0x%08" PRIx32 " (was 0x%08" PRIx32 ")",
                        xtensa->core_cache->reg_list[xtensa->eps_dbglevel_idx].name,
                        newps,
                        oldps);
        }
        do {
                xtensa_reg_set(target, XT_REG_IDX_ICOUNTLEVEL, icountlvl);
                xtensa_reg_set(target, XT_REG_IDX_ICOUNT, icount_val);

                /* Now ICOUNT is set, we can resume as if we were going to run */
                res = xtensa_prepare_resume(target, current, address, 0, 0);
                if (res != ERROR_OK) {
                        LOG_TARGET_ERROR(target, "Failed to prepare resume for single step");
                        return res;
                }
                res = xtensa_do_resume(target);
                if (res != ERROR_OK) {
                        LOG_TARGET_ERROR(target, "Failed to resume after setting up single step");
                        return res;
                }

                /* Wait for stepping to complete */
                long long start = timeval_ms();
                while (timeval_ms() < start + 500) {
                        /* Do not use target_poll here, it also triggers other things... just manually read the DSR
                         *until stepping is complete. */
                        usleep(1000);
                        res = xtensa_dm_core_status_read(&xtensa->dbg_mod);
                        if (res != ERROR_OK) {
                                LOG_TARGET_ERROR(target, "Failed to read core status!");
                                return res;
                        }
                        if (xtensa_is_stopped(target))
                                break;
                        usleep(1000);
                }
                LOG_TARGET_DEBUG(target, "Finish stepping. dsr=0x%08" PRIx32,
                        xtensa_dm_core_status_get(&xtensa->dbg_mod));
                if (!xtensa_is_stopped(target)) {
                        LOG_TARGET_WARNING(
                                target,
                                "Timed out waiting for target to finish stepping. dsr=0x%08" PRIx32,
                                xtensa_dm_core_status_get(&xtensa->dbg_mod));
                        target->debug_reason = DBG_REASON_NOTHALTED;
                        target->state = TARGET_RUNNING;
                        return ERROR_FAIL;
                }

                xtensa_fetch_all_regs(target);
                cur_pc = xtensa_reg_get(target, XT_REG_IDX_PC);

                LOG_TARGET_DEBUG(target,
                        "cur_ps=%" PRIx32 ", cur_pc=%" PRIx32 " dbg_cause=%" PRIx32 " exc_cause=%" PRIx32,
                        xtensa_reg_get(target, XT_REG_IDX_PS),
                        cur_pc,
                        xtensa_cause_get(target),
                        xtensa_reg_get(target, XT_REG_IDX_EXCCAUSE));

                /* Do not step into WindowOverflow if ISRs are masked.
                   If we stop in WindowOverflow at breakpoint with masked ISRs and
                   try to do a step it will get us out of that handler */
                if (xtensa->core_config->windowed &&
                        xtensa->stepping_isr_mode == XT_STEPPING_ISR_OFF &&
                        xtensa_pc_in_winexc(target, cur_pc)) {
                        /* isrmask = on, need to step out of the window exception handler */
                        LOG_DEBUG("Stepping out of window exception, PC=%" PRIX32, cur_pc);
                        oldpc = cur_pc;
                        address = oldpc + 3;
                        continue;
                }

                if (oldpc == cur_pc)
                        LOG_TARGET_WARNING(target, "Stepping doesn't seem to change PC! dsr=0x%08" PRIx32,
                                xtensa_dm_core_status_get(&xtensa->dbg_mod));
                else
                        LOG_DEBUG("Stepped from %" PRIX32 " to %" PRIX32, oldpc, cur_pc);
                break;
        } while (true);

        target->debug_reason = DBG_REASON_SINGLESTEP;
        target->state = TARGET_HALTED;
        LOG_DEBUG("Done stepping, PC=%" PRIX32, cur_pc);

        if (cause & DEBUGCAUSE_DB) {
                LOG_TARGET_DEBUG(target, "...Done, re-installing watchpoints.");
                /* Restore the DBREAKCx registers */
                for (unsigned int slot = 0; slot < xtensa->core_config->debug.dbreaks_num; slot++)
                        xtensa_reg_set(target, XT_REG_IDX_DBREAKC0 + slot, dbreakc[slot]);
        }

        /* Restore int level */
        if (ps_lowered) {
                LOG_DEBUG("Restoring %s after stepping: 0x%08" PRIx32,
                        xtensa->core_cache->reg_list[xtensa->eps_dbglevel_idx].name,
                        oldps);
                xtensa_reg_set(target, xtensa->eps_dbglevel_idx, oldps);
        }

        /* write ICOUNTLEVEL back to zero */
        xtensa_reg_set(target, XT_REG_IDX_ICOUNTLEVEL, 0);
        /* TODO: can we skip writing dirty registers and re-fetching them? */
        res = xtensa_write_dirty_registers(target);
        xtensa_fetch_all_regs(target);
        return res;
}

int xtensa_step(struct target *target, int current, target_addr_t address, int handle_breakpoints)
{
        int retval = xtensa_do_step(target, current, address, handle_breakpoints);
        if (retval != ERROR_OK)
                return retval;
        target_call_event_callbacks(target, TARGET_EVENT_HALTED);

        return ERROR_OK;
}

/**
 * Returns true if two ranges are overlapping
 */
static inline bool xtensa_memory_regions_overlap(target_addr_t r1_start,
        target_addr_t r1_end,
        target_addr_t r2_start,
        target_addr_t r2_end)
{
        if ((r2_start >= r1_start) && (r2_start < r1_end))
                return true;    /* r2_start is in r1 region */
        if ((r2_end > r1_start) && (r2_end <= r1_end))
                return true;    /* r2_end is in r1 region */
        return false;
}

/**
 * Returns a size of overlapped region of two ranges.
 */
static inline target_addr_t xtensa_get_overlap_size(target_addr_t r1_start,
        target_addr_t r1_end,
        target_addr_t r2_start,
        target_addr_t r2_end)
{
        if (xtensa_memory_regions_overlap(r1_start, r1_end, r2_start, r2_end)) {
                target_addr_t ov_start = r1_start < r2_start ? r2_start : r1_start;
                target_addr_t ov_end = r1_end > r2_end ? r2_end : r1_end;
                return ov_end - ov_start;
        }
        return 0;
}

/**
 * Check if the address gets to memory regions, and its access mode
 */
static bool xtensa_memory_op_validate_range(struct xtensa *xtensa, target_addr_t address, size_t size, int access)
{
        target_addr_t adr_pos = address;        /* address cursor set to the beginning start */
        target_addr_t adr_end = address + size; /* region end */
        target_addr_t overlap_size;
        const struct xtensa_local_mem_region_config *cm;        /* current mem region */

        while (adr_pos < adr_end) {
                cm = xtensa_target_memory_region_find(xtensa, adr_pos);
                if (!cm)        /* address is not belong to anything */
                        return false;
                if ((cm->access & access) != access)    /* access check */
                        return false;
                overlap_size = xtensa_get_overlap_size(cm->base, (cm->base + cm->size), adr_pos, adr_end);
                assert(overlap_size != 0);
                adr_pos += overlap_size;
        }
        return true;
}

int xtensa_read_memory(struct target *target, target_addr_t address, uint32_t size, uint32_t count, uint8_t *buffer)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        /* We are going to read memory in 32-bit increments. This may not be what the calling
         * function expects, so we may need to allocate a temp buffer and read into that first. */
        target_addr_t addrstart_al = ALIGN_DOWN(address, 4);
        target_addr_t addrend_al = ALIGN_UP(address + size * count, 4);
        target_addr_t adr = addrstart_al;
        uint8_t *albuff;
        bool bswap = xtensa->target->endianness == TARGET_BIG_ENDIAN;

        if (target->state != TARGET_HALTED) {
                LOG_TARGET_WARNING(target, "target not halted");
                return ERROR_TARGET_NOT_HALTED;
        }

        if (!xtensa->permissive_mode) {
                if (!xtensa_memory_op_validate_range(xtensa, address, (size * count),
                                XT_MEM_ACCESS_READ)) {
                        LOG_DEBUG("address " TARGET_ADDR_FMT " not readable", address);
                        return ERROR_FAIL;
                }
        }

        unsigned int alloc_bytes = ALIGN_UP(addrend_al - addrstart_al, sizeof(uint32_t));
        albuff = calloc(alloc_bytes, 1);
        if (!albuff) {
                LOG_TARGET_ERROR(target, "Out of memory allocating %" PRId64 " bytes!",
                        addrend_al - addrstart_al);
                return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
        }

        /* We're going to use A3 here */
        xtensa_mark_register_dirty(xtensa, XT_REG_IDX_A3);
        /* Write start address to A3 */
        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, addrstart_al);
        xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));
        /* Now we can safely read data from addrstart_al up to addrend_al into albuff */
        if (xtensa->probe_lsddr32p != 0) {
                xtensa_queue_exec_ins(xtensa, XT_INS_LDDR32P(xtensa, XT_REG_A3));
                for (unsigned int i = 0; adr != addrend_al; i += sizeof(uint32_t), adr += sizeof(uint32_t))
                        xtensa_queue_dbg_reg_read(xtensa,
                                (adr + sizeof(uint32_t) == addrend_al) ? XDMREG_DDR : XDMREG_DDREXEC,
                                &albuff[i]);
        } else {
                xtensa_mark_register_dirty(xtensa, XT_REG_IDX_A4);
                for (unsigned int i = 0; adr != addrend_al; i += sizeof(uint32_t), adr += sizeof(uint32_t)) {
                        xtensa_queue_exec_ins(xtensa, XT_INS_L32I(xtensa, XT_REG_A3, XT_REG_A4, 0));
                        xtensa_queue_exec_ins(xtensa, XT_INS_WSR(xtensa, XT_SR_DDR, XT_REG_A4));
                        xtensa_queue_dbg_reg_read(xtensa, XDMREG_DDR, &albuff[i]);
                        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, adr + sizeof(uint32_t));
                        xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));
                }
        }
        int res = xtensa_dm_queue_execute(&xtensa->dbg_mod);
        if (res == ERROR_OK) {
                bool prev_suppress = xtensa->suppress_dsr_errors;
                xtensa->suppress_dsr_errors = true;
                res = xtensa_core_status_check(target);
                if (xtensa->probe_lsddr32p == -1)
                        xtensa->probe_lsddr32p = 1;
                xtensa->suppress_dsr_errors = prev_suppress;
        }
        if (res != ERROR_OK) {
                if (xtensa->probe_lsddr32p != 0) {
                        /* Disable fast memory access instructions and retry before reporting an error */
                        LOG_TARGET_DEBUG(target, "Disabling LDDR32.P/SDDR32.P");
                        xtensa->probe_lsddr32p = 0;
                        res = xtensa_read_memory(target, address, size, count, albuff);
                        bswap = false;
                } else {
                        LOG_TARGET_WARNING(target, "Failed reading %d bytes at address "TARGET_ADDR_FMT,
                                count * size, address);
                }
        }

        if (bswap)
                buf_bswap32(albuff, albuff, addrend_al - addrstart_al);
        memcpy(buffer, albuff + (address & 3), (size * count));
        free(albuff);
        return res;
}

int xtensa_read_buffer(struct target *target, target_addr_t address, uint32_t count, uint8_t *buffer)
{
        /* xtensa_read_memory can also read unaligned stuff. Just pass through to that routine. */
        return xtensa_read_memory(target, address, 1, count, buffer);
}

int xtensa_write_memory(struct target *target,
        target_addr_t address,
        uint32_t size,
        uint32_t count,
        const uint8_t *buffer)
{
        /* This memory write function can get thrown nigh everything into it, from
         * aligned uint32 writes to unaligned uint8ths. The Xtensa memory doesn't always
         * accept anything but aligned uint32 writes, though. That is why we convert
         * everything into that. */
        struct xtensa *xtensa = target_to_xtensa(target);
        target_addr_t addrstart_al = ALIGN_DOWN(address, 4);
        target_addr_t addrend_al = ALIGN_UP(address + size * count, 4);
        target_addr_t adr = addrstart_al;
        int res;
        uint8_t *albuff;
        bool fill_head_tail = false;

        if (target->state != TARGET_HALTED) {
                LOG_TARGET_WARNING(target, "target not halted");
                return ERROR_TARGET_NOT_HALTED;
        }

        if (!xtensa->permissive_mode) {
                if (!xtensa_memory_op_validate_range(xtensa, address, (size * count), XT_MEM_ACCESS_WRITE)) {
                        LOG_WARNING("address " TARGET_ADDR_FMT " not writable", address);
                        return ERROR_FAIL;
                }
        }

        if (size == 0 || count == 0 || !buffer)
                return ERROR_COMMAND_SYNTAX_ERROR;

        /* Allocate a temporary buffer to put the aligned bytes in, if needed. */
        if (addrstart_al == address && addrend_al == address + (size * count)) {
                if (xtensa->target->endianness == TARGET_BIG_ENDIAN)
                        /* Need a buffer for byte-swapping */
                        albuff = malloc(addrend_al - addrstart_al);
                else
                        /* We discard the const here because albuff can also be non-const */
                        albuff = (uint8_t *)buffer;
        } else {
                fill_head_tail = true;
                albuff = malloc(addrend_al - addrstart_al);
        }
        if (!albuff) {
                LOG_TARGET_ERROR(target, "Out of memory allocating %" PRId64 " bytes!",
                        addrend_al - addrstart_al);
                return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
        }

        /* We're going to use A3 here */
        xtensa_mark_register_dirty(xtensa, XT_REG_IDX_A3);

        /* If we're using a temp aligned buffer, we need to fill the head and/or tail bit of it. */
        if (fill_head_tail) {
                /* See if we need to read the first and/or last word. */
                if (address & 3) {
                        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, addrstart_al);
                        xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));
                        if (xtensa->probe_lsddr32p == 1) {
                                xtensa_queue_exec_ins(xtensa, XT_INS_LDDR32P(xtensa, XT_REG_A3));
                        } else {
                                xtensa_queue_exec_ins(xtensa, XT_INS_L32I(xtensa, XT_REG_A3, XT_REG_A3, 0));
                                xtensa_queue_exec_ins(xtensa, XT_INS_WSR(xtensa, XT_SR_DDR, XT_REG_A3));
                        }
                        xtensa_queue_dbg_reg_read(xtensa, XDMREG_DDR, &albuff[0]);
                }
                if ((address + (size * count)) & 3) {
                        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, addrend_al - 4);
                        xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));
                        if (xtensa->probe_lsddr32p == 1) {
                                xtensa_queue_exec_ins(xtensa, XT_INS_LDDR32P(xtensa, XT_REG_A3));
                        } else {
                                xtensa_queue_exec_ins(xtensa, XT_INS_L32I(xtensa, XT_REG_A3, XT_REG_A3, 0));
                                xtensa_queue_exec_ins(xtensa, XT_INS_WSR(xtensa, XT_SR_DDR, XT_REG_A3));
                        }
                        xtensa_queue_dbg_reg_read(xtensa, XDMREG_DDR,
                                &albuff[addrend_al - addrstart_al - 4]);
                }
                /* Grab bytes */
                res = xtensa_dm_queue_execute(&xtensa->dbg_mod);
                if (res != ERROR_OK) {
                        LOG_ERROR("Error issuing unaligned memory write context instruction(s): %d", res);
                        if (albuff != buffer)
                                free(albuff);
                        return res;
                }
                xtensa_core_status_check(target);
                if (xtensa->target->endianness == TARGET_BIG_ENDIAN) {
                        bool swapped_w0 = false;
                        if (address & 3) {
                                buf_bswap32(&albuff[0], &albuff[0], 4);
                                swapped_w0 = true;
                        }
                        if ((address + (size * count)) & 3) {
                                if ((addrend_al - addrstart_al - 4 == 0) && swapped_w0) {
                                        /* Don't double-swap if buffer start/end are within the same word */
                                } else {
                                        buf_bswap32(&albuff[addrend_al - addrstart_al - 4],
                                                &albuff[addrend_al - addrstart_al - 4], 4);
                                }
                        }
                }
                /* Copy data to be written into the aligned buffer (in host-endianness) */
                memcpy(&albuff[address & 3], buffer, size * count);
                /* Now we can write albuff in aligned uint32s. */
        }

        if (xtensa->target->endianness == TARGET_BIG_ENDIAN)
                buf_bswap32(albuff, fill_head_tail ? albuff : buffer, addrend_al - addrstart_al);

        /* Write start address to A3 */
        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, addrstart_al);
        xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));
        /* Write the aligned buffer */
        if (xtensa->probe_lsddr32p != 0) {
                for (unsigned int i = 0; adr != addrend_al; i += sizeof(uint32_t), adr += sizeof(uint32_t)) {
                        if (i == 0) {
                                xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, buf_get_u32(&albuff[i], 0, 32));
                                xtensa_queue_exec_ins(xtensa, XT_INS_SDDR32P(xtensa, XT_REG_A3));
                        } else {
                                xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDREXEC, buf_get_u32(&albuff[i], 0, 32));
                        }
                }
        } else {
                xtensa_mark_register_dirty(xtensa, XT_REG_IDX_A4);
                for (unsigned int i = 0; adr != addrend_al; i += sizeof(uint32_t), adr += sizeof(uint32_t)) {
                        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, buf_get_u32(&albuff[i], 0, 32));
                        xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A4));
                        xtensa_queue_exec_ins(xtensa, XT_INS_S32I(xtensa, XT_REG_A3, XT_REG_A4, 0));
                        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, adr + sizeof(uint32_t));
                        xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));
                }
        }

        res = xtensa_dm_queue_execute(&xtensa->dbg_mod);
        if (res == ERROR_OK) {
                bool prev_suppress = xtensa->suppress_dsr_errors;
                xtensa->suppress_dsr_errors = true;
                res = xtensa_core_status_check(target);
                if (xtensa->probe_lsddr32p == -1)
                        xtensa->probe_lsddr32p = 1;
                xtensa->suppress_dsr_errors = prev_suppress;
        }
        if (res != ERROR_OK) {
                if (xtensa->probe_lsddr32p != 0) {
                        /* Disable fast memory access instructions and retry before reporting an error */
                        LOG_TARGET_INFO(target, "Disabling LDDR32.P/SDDR32.P");
                        xtensa->probe_lsddr32p = 0;
                        res = xtensa_write_memory(target, address, size, count, buffer);
                } else {
                        LOG_TARGET_WARNING(target, "Failed writing %d bytes at address "TARGET_ADDR_FMT,
                                count * size, address);
                }
        } else {
                /* Invalidate ICACHE, writeback DCACHE if present */
                uint32_t issue_ihi = xtensa_is_icacheable(xtensa, address);
                uint32_t issue_dhwb = xtensa_is_dcacheable(xtensa, address);
                if (issue_ihi || issue_dhwb) {
                        uint32_t ilinesize = issue_ihi ?  xtensa->core_config->icache.line_size : UINT32_MAX;
                        uint32_t dlinesize = issue_dhwb ? xtensa->core_config->dcache.line_size : UINT32_MAX;
                        uint32_t linesize = MIN(ilinesize, dlinesize);
                        uint32_t off = 0;
                        adr = addrstart_al;

                        while ((adr + off) < addrend_al) {
                                if (off == 0) {
                                        /* Write start address to A3 */
                                        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, adr);
                                        xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));
                                }
                                if (issue_ihi)
                                        xtensa_queue_exec_ins(xtensa, XT_INS_IHI(xtensa, XT_REG_A3, off));
                                if (issue_dhwb)
                                        xtensa_queue_exec_ins(xtensa, XT_INS_DHWBI(xtensa, XT_REG_A3, off));
                                off += linesize;
                                if (off > 1020) {
                                        /* IHI, DHWB have 8-bit immediate operands (0..1020) */
                                        adr += off;
                                        off = 0;
                                }
                        }

                        /* Execute cache WB/INV instructions */
                        res = xtensa_dm_queue_execute(&xtensa->dbg_mod);
                        xtensa_core_status_check(target);
                        if (res != ERROR_OK)
                                LOG_TARGET_ERROR(target,
                                        "Error issuing cache writeback/invaldate instruction(s): %d",
                                        res);
                }
        }
        if (albuff != buffer)
                free(albuff);

        return res;
}

int xtensa_write_buffer(struct target *target, target_addr_t address, uint32_t count, const uint8_t *buffer)
{
        /* xtensa_write_memory can handle everything. Just pass on to that. */
        return xtensa_write_memory(target, address, 1, count, buffer);
}

int xtensa_checksum_memory(struct target *target, target_addr_t address, uint32_t count, uint32_t *checksum)
{
        LOG_WARNING("not implemented yet");
        return ERROR_FAIL;
}

int xtensa_poll(struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        if (xtensa_dm_poll(&xtensa->dbg_mod) != ERROR_OK) {
                target->state = TARGET_UNKNOWN;
                return ERROR_TARGET_NOT_EXAMINED;
        }

        int res = xtensa_dm_power_status_read(&xtensa->dbg_mod, PWRSTAT_DEBUGWASRESET(xtensa) |
                PWRSTAT_COREWASRESET(xtensa));
        if (xtensa->dbg_mod.power_status.stat != xtensa->dbg_mod.power_status.stath)
                LOG_TARGET_DEBUG(target, "PWRSTAT: read 0x%08" PRIx32 ", clear 0x%08lx, reread 0x%08" PRIx32,
                        xtensa->dbg_mod.power_status.stat,
                        PWRSTAT_DEBUGWASRESET(xtensa) | PWRSTAT_COREWASRESET(xtensa),
                        xtensa->dbg_mod.power_status.stath);
        if (res != ERROR_OK)
                return res;

        if (xtensa_dm_tap_was_reset(&xtensa->dbg_mod)) {
                LOG_TARGET_INFO(target, "Debug controller was reset.");
                res = xtensa_smpbreak_write(xtensa, xtensa->smp_break);
                if (res != ERROR_OK)
                        return res;
        }
        if (xtensa_dm_core_was_reset(&xtensa->dbg_mod))
                LOG_TARGET_INFO(target, "Core was reset.");
        xtensa_dm_power_status_cache(&xtensa->dbg_mod);
        /* Enable JTAG, set reset if needed */
        res = xtensa_wakeup(target);
        if (res != ERROR_OK)
                return res;

        uint32_t prev_dsr = xtensa->dbg_mod.core_status.dsr;
        res = xtensa_dm_core_status_read(&xtensa->dbg_mod);
        if (res != ERROR_OK)
                return res;
        if (prev_dsr != xtensa->dbg_mod.core_status.dsr)
                LOG_TARGET_DEBUG(target,
                        "DSR has changed: was 0x%08" PRIx32 " now 0x%08" PRIx32,
                        prev_dsr,
                        xtensa->dbg_mod.core_status.dsr);
        if (xtensa->dbg_mod.power_status.stath & PWRSTAT_COREWASRESET(xtensa)) {
                /* if RESET state is persitent  */
                target->state = TARGET_RESET;
        } else if (!xtensa_dm_is_powered(&xtensa->dbg_mod)) {
                LOG_TARGET_DEBUG(target, "not powered 0x%" PRIX32 "%ld",
                        xtensa->dbg_mod.core_status.dsr,
                        xtensa->dbg_mod.core_status.dsr & OCDDSR_STOPPED);
                target->state = TARGET_UNKNOWN;
                if (xtensa->come_online_probes_num == 0)
                        target->examined = false;
                else
                        xtensa->come_online_probes_num--;
        } else if (xtensa_is_stopped(target)) {
                if (target->state != TARGET_HALTED) {
                        enum target_state oldstate = target->state;
                        target->state = TARGET_HALTED;
                        /* Examine why the target has been halted */
                        target->debug_reason = DBG_REASON_DBGRQ;
                        xtensa_fetch_all_regs(target);
                        /* When setting debug reason DEBUGCAUSE events have the following
                         * priorities: watchpoint == breakpoint > single step > debug interrupt. */
                        /* Watchpoint and breakpoint events at the same time results in special
                         * debug reason: DBG_REASON_WPTANDBKPT. */
                        uint32_t halt_cause = xtensa_cause_get(target);
                        /* TODO: Add handling of DBG_REASON_EXC_CATCH */
                        if (halt_cause & DEBUGCAUSE_IC)
                                target->debug_reason = DBG_REASON_SINGLESTEP;
                        if (halt_cause & (DEBUGCAUSE_IB | DEBUGCAUSE_BN | DEBUGCAUSE_BI)) {
                                if (halt_cause & DEBUGCAUSE_DB)
                                        target->debug_reason = DBG_REASON_WPTANDBKPT;
                                else
                                        target->debug_reason = DBG_REASON_BREAKPOINT;
                        } else if (halt_cause & DEBUGCAUSE_DB) {
                                target->debug_reason = DBG_REASON_WATCHPOINT;
                        }
                        LOG_TARGET_DEBUG(target, "Target halted, pc=0x%08" PRIx32
                                ", debug_reason=%08" PRIx32 ", oldstate=%08" PRIx32,
                                xtensa_reg_get(target, XT_REG_IDX_PC),
                                target->debug_reason,
                                oldstate);
                        LOG_TARGET_DEBUG(target, "Halt reason=0x%08" PRIX32 ", exc_cause=%" PRId32 ", dsr=0x%08" PRIx32,
                                halt_cause,
                                xtensa_reg_get(target, XT_REG_IDX_EXCCAUSE),
                                xtensa->dbg_mod.core_status.dsr);
                        xtensa_dm_core_status_clear(
                                &xtensa->dbg_mod,
                                OCDDSR_DEBUGPENDBREAK | OCDDSR_DEBUGINTBREAK | OCDDSR_DEBUGPENDTRAX |
                                OCDDSR_DEBUGINTTRAX |
                                OCDDSR_DEBUGPENDHOST | OCDDSR_DEBUGINTHOST);
                }
        } else {
                target->debug_reason = DBG_REASON_NOTHALTED;
                if (target->state != TARGET_RUNNING && target->state != TARGET_DEBUG_RUNNING) {
                        target->state = TARGET_RUNNING;
                        target->debug_reason = DBG_REASON_NOTHALTED;
                }
        }
        if (xtensa->trace_active) {
                /* Detect if tracing was active but has stopped. */
                struct xtensa_trace_status trace_status;
                res = xtensa_dm_trace_status_read(&xtensa->dbg_mod, &trace_status);
                if (res == ERROR_OK) {
                        if (!(trace_status.stat & TRAXSTAT_TRACT)) {
                                LOG_INFO("Detected end of trace.");
                                if (trace_status.stat & TRAXSTAT_PCMTG)
                                        LOG_TARGET_INFO(target, "Trace stop triggered by PC match");
                                if (trace_status.stat & TRAXSTAT_PTITG)
                                        LOG_TARGET_INFO(target, "Trace stop triggered by Processor Trigger Input");
                                if (trace_status.stat & TRAXSTAT_CTITG)
                                        LOG_TARGET_INFO(target, "Trace stop triggered by Cross-trigger Input");
                                xtensa->trace_active = false;
                        }
                }
        }
        return ERROR_OK;
}

static int xtensa_update_instruction(struct target *target, target_addr_t address, uint32_t size, const uint8_t *buffer)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        unsigned int issue_ihi = xtensa_is_icacheable(xtensa, address);
        unsigned int issue_dhwbi = xtensa_is_dcacheable(xtensa, address);
        uint32_t icache_line_size = issue_ihi ? xtensa->core_config->icache.line_size : UINT32_MAX;
        uint32_t dcache_line_size = issue_dhwbi ? xtensa->core_config->dcache.line_size : UINT32_MAX;
        unsigned int same_ic_line = ((address & (icache_line_size - 1)) + size) <= icache_line_size;
        unsigned int same_dc_line = ((address & (dcache_line_size - 1)) + size) <= dcache_line_size;
        int ret;

        if (size > icache_line_size)
                return ERROR_FAIL;

        if (issue_ihi || issue_dhwbi) {
                /* We're going to use A3 here */
                xtensa_mark_register_dirty(xtensa, XT_REG_IDX_A3);

                /* Write start address to A3 and invalidate */
                xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, address);
                xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));
                LOG_TARGET_DEBUG(target, "DHWBI, IHI for address "TARGET_ADDR_FMT, address);
                if (issue_dhwbi) {
                        xtensa_queue_exec_ins(xtensa, XT_INS_DHWBI(xtensa, XT_REG_A3, 0));
                        if (!same_dc_line) {
                                LOG_TARGET_DEBUG(target,
                                        "DHWBI second dcache line for address "TARGET_ADDR_FMT,
                                        address + 4);
                                xtensa_queue_exec_ins(xtensa, XT_INS_DHWBI(xtensa, XT_REG_A3, 4));
                        }
                }
                if (issue_ihi) {
                        xtensa_queue_exec_ins(xtensa, XT_INS_IHI(xtensa, XT_REG_A3, 0));
                        if (!same_ic_line) {
                                LOG_TARGET_DEBUG(target,
                                        "IHI second icache line for address "TARGET_ADDR_FMT,
                                        address + 4);
                                xtensa_queue_exec_ins(xtensa, XT_INS_IHI(xtensa, XT_REG_A3, 4));
                        }
                }

                /* Execute invalidate instructions */
                ret = xtensa_dm_queue_execute(&xtensa->dbg_mod);
                xtensa_core_status_check(target);
                if (ret != ERROR_OK) {
                        LOG_ERROR("Error issuing cache invaldate instruction(s): %d", ret);
                        return ret;
                }
        }

        /* Write new instructions to memory */
        ret = target_write_buffer(target, address, size, buffer);
        if (ret != ERROR_OK) {
                LOG_TARGET_ERROR(target, "Error writing instruction to memory: %d", ret);
                return ret;
        }

        if (issue_dhwbi) {
                /* Flush dcache so instruction propagates.  A3 may be corrupted during memory write */
                xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, address);
                xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));
                xtensa_queue_exec_ins(xtensa, XT_INS_DHWB(xtensa, XT_REG_A3, 0));
                LOG_DEBUG("DHWB dcache line for address "TARGET_ADDR_FMT, address);
                if (!same_dc_line) {
                        LOG_TARGET_DEBUG(target, "DHWB second dcache line for address "TARGET_ADDR_FMT, address + 4);
                        xtensa_queue_exec_ins(xtensa, XT_INS_DHWB(xtensa, XT_REG_A3, 4));
                }

                /* Execute invalidate instructions */
                ret = xtensa_dm_queue_execute(&xtensa->dbg_mod);
                xtensa_core_status_check(target);
        }

        /* TODO: Handle L2 cache if present */
        return ret;
}

static int xtensa_sw_breakpoint_add(struct target *target,
        struct breakpoint *breakpoint,
        struct xtensa_sw_breakpoint *sw_bp)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        int ret = target_read_buffer(target, breakpoint->address, XT_ISNS_SZ_MAX, sw_bp->insn);
        if (ret != ERROR_OK) {
                LOG_TARGET_ERROR(target, "Failed to read original instruction (%d)!", ret);
                return ret;
        }

        sw_bp->insn_sz = MIN(XT_ISNS_SZ_MAX, breakpoint->length);
        sw_bp->oocd_bp = breakpoint;

        uint32_t break_insn = sw_bp->insn_sz == XT_ISNS_SZ_MAX ? XT_INS_BREAK(xtensa, 0, 0) : XT_INS_BREAKN(xtensa, 0);

        /* Underlying memory write will convert instruction endianness, don't do that here */
        ret = xtensa_update_instruction(target, breakpoint->address, sw_bp->insn_sz, (uint8_t *)&break_insn);
        if (ret != ERROR_OK) {
                LOG_TARGET_ERROR(target, "Failed to write breakpoint instruction (%d)!", ret);
                return ret;
        }

        return ERROR_OK;
}

static int xtensa_sw_breakpoint_remove(struct target *target, struct xtensa_sw_breakpoint *sw_bp)
{
        int ret = xtensa_update_instruction(target, sw_bp->oocd_bp->address, sw_bp->insn_sz, sw_bp->insn);
        if (ret != ERROR_OK) {
                LOG_TARGET_ERROR(target, "Failed to write insn (%d)!", ret);
                return ret;
        }
        sw_bp->oocd_bp = NULL;
        return ERROR_OK;
}

int xtensa_breakpoint_add(struct target *target, struct breakpoint *breakpoint)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        unsigned int slot;

        if (breakpoint->type == BKPT_SOFT) {
                for (slot = 0; slot < XT_SW_BREAKPOINTS_MAX_NUM; slot++) {
                        if (!xtensa->sw_brps[slot].oocd_bp ||
                                xtensa->sw_brps[slot].oocd_bp == breakpoint)
                                break;
                }
                if (slot == XT_SW_BREAKPOINTS_MAX_NUM) {
                        LOG_TARGET_WARNING(target, "No free slots to add SW breakpoint!");
                        return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
                }
                int ret = xtensa_sw_breakpoint_add(target, breakpoint, &xtensa->sw_brps[slot]);
                if (ret != ERROR_OK) {
                        LOG_TARGET_ERROR(target, "Failed to add SW breakpoint!");
                        return ret;
                }
                LOG_TARGET_DEBUG(target, "placed SW breakpoint %u @ " TARGET_ADDR_FMT,
                        slot,
                        breakpoint->address);
                return ERROR_OK;
        }

        for (slot = 0; slot < xtensa->core_config->debug.ibreaks_num; slot++) {
                if (!xtensa->hw_brps[slot] || xtensa->hw_brps[slot] == breakpoint)
                        break;
        }
        if (slot == xtensa->core_config->debug.ibreaks_num) {
                LOG_TARGET_ERROR(target, "No free slots to add HW breakpoint!");
                return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
        }

        xtensa->hw_brps[slot] = breakpoint;
        /* We will actually write the breakpoints when we resume the target. */
        LOG_TARGET_DEBUG(target, "placed HW breakpoint %u @ " TARGET_ADDR_FMT,
                slot,
                breakpoint->address);

        return ERROR_OK;
}

int xtensa_breakpoint_remove(struct target *target, struct breakpoint *breakpoint)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        unsigned int slot;

        if (breakpoint->type == BKPT_SOFT) {
                for (slot = 0; slot < XT_SW_BREAKPOINTS_MAX_NUM; slot++) {
                        if (xtensa->sw_brps[slot].oocd_bp && xtensa->sw_brps[slot].oocd_bp == breakpoint)
                                break;
                }
                if (slot == XT_SW_BREAKPOINTS_MAX_NUM) {
                        LOG_TARGET_WARNING(target, "Max SW breakpoints slot reached, slot=%u!", slot);
                        return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
                }
                int ret = xtensa_sw_breakpoint_remove(target, &xtensa->sw_brps[slot]);
                if (ret != ERROR_OK) {
                        LOG_TARGET_ERROR(target, "Failed to remove SW breakpoint (%d)!", ret);
                        return ret;
                }
                LOG_TARGET_DEBUG(target, "cleared SW breakpoint %u @ " TARGET_ADDR_FMT, slot, breakpoint->address);
                return ERROR_OK;
        }

        for (slot = 0; slot < xtensa->core_config->debug.ibreaks_num; slot++) {
                if (xtensa->hw_brps[slot] == breakpoint)
                        break;
        }
        if (slot == xtensa->core_config->debug.ibreaks_num) {
                LOG_TARGET_ERROR(target, "HW breakpoint not found!");
                return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
        }
        xtensa->hw_brps[slot] = NULL;
        LOG_TARGET_DEBUG(target, "cleared HW breakpoint %u @ " TARGET_ADDR_FMT, slot, breakpoint->address);
        return ERROR_OK;
}

int xtensa_watchpoint_add(struct target *target, struct watchpoint *watchpoint)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        unsigned int slot;
        xtensa_reg_val_t dbreakcval;

        if (target->state != TARGET_HALTED) {
                LOG_TARGET_WARNING(target, "target not halted");
                return ERROR_TARGET_NOT_HALTED;
        }

        if (watchpoint->mask != ~(uint32_t)0) {
                LOG_TARGET_ERROR(target, "watchpoint value masks not supported");
                return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
        }

        for (slot = 0; slot < xtensa->core_config->debug.dbreaks_num; slot++) {
                if (!xtensa->hw_wps[slot] || xtensa->hw_wps[slot] == watchpoint)
                        break;
        }
        if (slot == xtensa->core_config->debug.dbreaks_num) {
                LOG_TARGET_WARNING(target, "No free slots to add HW watchpoint!");
                return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
        }

        /* Figure out value for dbreakc5..0
         * It's basically 0x3F with an incremental bit removed from the LSB for each extra length power of 2. */
        if (watchpoint->length < 1 || watchpoint->length > 64 ||
                !IS_PWR_OF_2(watchpoint->length) ||
                !IS_ALIGNED(watchpoint->address, watchpoint->length)) {
                LOG_TARGET_WARNING(
                        target,
                        "Watchpoint with length %d on address " TARGET_ADDR_FMT
                        " not supported by hardware.",
                        watchpoint->length,
                        watchpoint->address);
                return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
        }
        dbreakcval = ALIGN_DOWN(0x3F, watchpoint->length);

        if (watchpoint->rw == WPT_READ)
                dbreakcval |= BIT(30);
        if (watchpoint->rw == WPT_WRITE)
                dbreakcval |= BIT(31);
        if (watchpoint->rw == WPT_ACCESS)
                dbreakcval |= BIT(30) | BIT(31);

        /* Write DBREAKA[slot] and DBCREAKC[slot] */
        xtensa_reg_set(target, XT_REG_IDX_DBREAKA0 + slot, watchpoint->address);
        xtensa_reg_set(target, XT_REG_IDX_DBREAKC0 + slot, dbreakcval);
        xtensa->hw_wps[slot] = watchpoint;
        LOG_TARGET_DEBUG(target, "placed HW watchpoint @ " TARGET_ADDR_FMT,
                watchpoint->address);
        return ERROR_OK;
}

int xtensa_watchpoint_remove(struct target *target, struct watchpoint *watchpoint)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        unsigned int slot;

        for (slot = 0; slot < xtensa->core_config->debug.dbreaks_num; slot++) {
                if (xtensa->hw_wps[slot] == watchpoint)
                        break;
        }
        if (slot == xtensa->core_config->debug.dbreaks_num) {
                LOG_TARGET_WARNING(target, "HW watchpoint " TARGET_ADDR_FMT " not found!", watchpoint->address);
                return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
        }
        xtensa_reg_set(target, XT_REG_IDX_DBREAKC0 + slot, 0);
        xtensa->hw_wps[slot] = NULL;
        LOG_TARGET_DEBUG(target, "cleared HW watchpoint @ " TARGET_ADDR_FMT,
                watchpoint->address);
        return ERROR_OK;
}

static int xtensa_build_reg_cache(struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        struct reg_cache **cache_p = register_get_last_cache_p(&target->reg_cache);
        unsigned int last_dbreg_num = 0;

        if (xtensa->core_regs_num + xtensa->num_optregs != xtensa->total_regs_num)
                LOG_TARGET_WARNING(target, "Register count MISMATCH: %d core regs, %d extended regs; %d expected",
                        xtensa->core_regs_num, xtensa->num_optregs, xtensa->total_regs_num);

        struct reg_cache *reg_cache = calloc(1, sizeof(struct reg_cache));

        if (!reg_cache) {
                LOG_ERROR("Failed to alloc reg cache!");
                return ERROR_FAIL;
        }
        reg_cache->name = "Xtensa registers";
        reg_cache->next = NULL;
        /* Init reglist */
        unsigned int reg_list_size = XT_NUM_REGS + xtensa->num_optregs;
        struct reg *reg_list = calloc(reg_list_size, sizeof(struct reg));
        if (!reg_list) {
                LOG_ERROR("Failed to alloc reg list!");
                goto fail;
        }
        xtensa->dbregs_num = 0;
        unsigned int didx = 0;
        for (unsigned int whichlist = 0; whichlist < 2; whichlist++) {
                struct xtensa_reg_desc *rlist = (whichlist == 0) ? xtensa_regs : xtensa->optregs;
                unsigned int listsize = (whichlist == 0) ? XT_NUM_REGS : xtensa->num_optregs;
                for (unsigned int i = 0; i < listsize; i++, didx++) {
                        reg_list[didx].exist = rlist[i].exist;
                        reg_list[didx].name = rlist[i].name;
                        reg_list[didx].size = 32;
                        reg_list[didx].value = calloc(1, 4 /*XT_REG_LEN*/);     /* make Clang Static Analyzer happy */
                        if (!reg_list[didx].value) {
                                LOG_ERROR("Failed to alloc reg list value!");
                                goto fail;
                        }
                        reg_list[didx].dirty = false;
                        reg_list[didx].valid = false;
                        reg_list[didx].type = &xtensa_reg_type;
                        reg_list[didx].arch_info = xtensa;
                        if (rlist[i].exist && (rlist[i].dbreg_num > last_dbreg_num))
                                last_dbreg_num = rlist[i].dbreg_num;

                        if (xtensa_extra_debug_log) {
                                LOG_TARGET_DEBUG(target,
                                        "POPULATE %-16s list %d exist %d, idx %d, type %d, dbreg_num 0x%04x",
                                        reg_list[didx].name,
                                        whichlist,
                                        reg_list[didx].exist,
                                        didx,
                                        rlist[i].type,
                                        rlist[i].dbreg_num);
                        }
                }
        }

        xtensa->dbregs_num = last_dbreg_num + 1;
        reg_cache->reg_list = reg_list;
        reg_cache->num_regs = reg_list_size;

        LOG_TARGET_DEBUG(target, "xtensa->total_regs_num %d reg_list_size %d xtensa->dbregs_num %d",
                xtensa->total_regs_num, reg_list_size, xtensa->dbregs_num);

        /* Construct empty-register list for handling unknown register requests */
        xtensa->empty_regs = calloc(xtensa->dbregs_num, sizeof(struct reg));
        if (!xtensa->empty_regs) {
                LOG_TARGET_ERROR(target, "ERROR: Out of memory");
                goto fail;
        }
        for (unsigned int i = 0; i < xtensa->dbregs_num; i++) {
                xtensa->empty_regs[i].name = calloc(8, sizeof(char));
                if (!xtensa->empty_regs[i].name) {
                        LOG_TARGET_ERROR(target, "ERROR: Out of memory");
                        goto fail;
                }
                sprintf((char *)xtensa->empty_regs[i].name, "?0x%04x", i & 0x0000FFFF);
                xtensa->empty_regs[i].size = 32;
                xtensa->empty_regs[i].type = &xtensa_reg_type;
                xtensa->empty_regs[i].value = calloc(1, 4 /*XT_REG_LEN*/);      /* make Clang Static Analyzer happy */
                if (!xtensa->empty_regs[i].value) {
                        LOG_ERROR("Failed to alloc empty reg list value!");
                        goto fail;
                }
                xtensa->empty_regs[i].arch_info = xtensa;
        }

        /* Construct contiguous register list from contiguous descriptor list */
        if (xtensa->regmap_contiguous && xtensa->contiguous_regs_desc) {
                xtensa->contiguous_regs_list = calloc(xtensa->total_regs_num, sizeof(struct reg *));
                if (!xtensa->contiguous_regs_list) {
                        LOG_TARGET_ERROR(target, "ERROR: Out of memory");
                        goto fail;
                }
                for (unsigned int i = 0; i < xtensa->total_regs_num; i++) {
                        unsigned int j;
                        for (j = 0; j < reg_cache->num_regs; j++) {
                                if (!strcmp(reg_cache->reg_list[j].name, xtensa->contiguous_regs_desc[i]->name)) {
                                        /*      Register number field is not filled above.
                                                Here we are assigning the corresponding index from the contiguous reg list.
                                                These indexes are in the same order with gdb g-packet request/response.
                                                Some more changes may be required for sparse reg lists.
                                        */
                                        reg_cache->reg_list[j].number = i;
                                        xtensa->contiguous_regs_list[i] = &(reg_cache->reg_list[j]);
                                        LOG_TARGET_DEBUG(target,
                                                "POPULATE contiguous regs list: %-16s, dbreg_num 0x%04x",
                                                xtensa->contiguous_regs_list[i]->name,
                                                xtensa->contiguous_regs_desc[i]->dbreg_num);
                                        break;
                                }
                        }
                        if (j == reg_cache->num_regs)
                                LOG_TARGET_WARNING(target, "contiguous register %s not found",
                                        xtensa->contiguous_regs_desc[i]->name);
                }
        }

        xtensa->algo_context_backup = calloc(reg_cache->num_regs, sizeof(void *));
        if (!xtensa->algo_context_backup) {
                LOG_ERROR("Failed to alloc mem for algorithm context backup!");
                goto fail;
        }
        for (unsigned int i = 0; i < reg_cache->num_regs; i++) {
                struct reg *reg = &reg_cache->reg_list[i];
                xtensa->algo_context_backup[i] = calloc(1, reg->size / 8);
                if (!xtensa->algo_context_backup[i]) {
                        LOG_ERROR("Failed to alloc mem for algorithm context!");
                        goto fail;
                }
        }
        xtensa->core_cache = reg_cache;
        if (cache_p)
                *cache_p = reg_cache;
        return ERROR_OK;

fail:
        if (reg_list) {
                for (unsigned int i = 0; i < reg_list_size; i++)
                        free(reg_list[i].value);
                free(reg_list);
        }
        if (xtensa->empty_regs) {
                for (unsigned int i = 0; i < xtensa->dbregs_num; i++) {
                        free((void *)xtensa->empty_regs[i].name);
                        free(xtensa->empty_regs[i].value);
                }
                free(xtensa->empty_regs);
        }
        if (xtensa->algo_context_backup) {
                for (unsigned int i = 0; i < reg_cache->num_regs; i++)
                        free(xtensa->algo_context_backup[i]);
                free(xtensa->algo_context_backup);
        }
        free(reg_cache);

        return ERROR_FAIL;
}

static int32_t xtensa_gdbqc_parse_exec_tie_ops(struct target *target, char *opstr)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        int32_t status = ERROR_COMMAND_ARGUMENT_INVALID;
        /* Process op[] list */
        while (opstr && (*opstr == ':')) {
                uint8_t ops[32];
                unsigned int oplen = strtoul(opstr + 1, &opstr, 16);
                if (oplen > 32) {
                        LOG_TARGET_ERROR(target, "TIE access instruction too long (%d)\n", oplen);
                        break;
                }
                unsigned int i = 0;
                while ((i < oplen) && opstr && (*opstr == ':'))
                        ops[i++] = strtoul(opstr + 1, &opstr, 16);
                if (i != oplen) {
                        LOG_TARGET_ERROR(target, "TIE access instruction malformed (%d)\n", i);
                        break;
                }

                char insn_buf[128];
                sprintf(insn_buf, "Exec %d-byte TIE sequence: ", oplen);
                for (i = 0; i < oplen; i++)
                        sprintf(insn_buf + strlen(insn_buf), "%02x:", ops[i]);
                LOG_TARGET_DEBUG(target, "%s", insn_buf);
                xtensa_queue_exec_ins_wide(xtensa, ops, oplen); /* Handles endian-swap */
                status = ERROR_OK;
        }
        return status;
}

static int xtensa_gdbqc_qxtreg(struct target *target, const char *packet, char **response_p)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        bool iswrite = (packet[0] == 'Q');
        enum xtensa_qerr_e error;

        /* Read/write TIE register.  Requires spill location.
         * qxtreg<num>:<len>:<oplen>:<op[0]>:<...>[:<oplen>:<op[0]>:<...>]
         * Qxtreg<num>:<len>:<oplen>:<op[0]>:<...>[:<oplen>:<op[0]>:<...>]=<value>
         */
        if (!(xtensa->spill_buf)) {
                LOG_ERROR("Spill location not specified. Try 'target remote <host>:3333 &spill_location0'");
                error = XT_QERR_FAIL;
                goto xtensa_gdbqc_qxtreg_fail;
        }

        char *delim;
        uint32_t regnum = strtoul(packet + 6, &delim, 16);
        if (*delim != ':') {
                LOG_ERROR("Malformed qxtreg packet");
                error = XT_QERR_INVAL;
                goto xtensa_gdbqc_qxtreg_fail;
        }
        uint32_t reglen = strtoul(delim + 1, &delim, 16);
        if (*delim != ':') {
                LOG_ERROR("Malformed qxtreg packet");
                error = XT_QERR_INVAL;
                goto xtensa_gdbqc_qxtreg_fail;
        }
        uint8_t regbuf[XT_QUERYPKT_RESP_MAX];
        memset(regbuf, 0, XT_QUERYPKT_RESP_MAX);
        LOG_DEBUG("TIE reg 0x%08" PRIx32 " %s (%d bytes)", regnum, iswrite ? "write" : "read", reglen);
        if (reglen * 2 + 1 > XT_QUERYPKT_RESP_MAX) {
                LOG_ERROR("TIE register too large");
                error = XT_QERR_MEM;
                goto xtensa_gdbqc_qxtreg_fail;
        }

        /* (1) Save spill memory, (1.5) [if write then store value to spill location],
         * (2) read old a4, (3) write spill address to a4.
         * NOTE: ensure a4 is restored properly by all error handling logic
         */
        unsigned int memop_size = (xtensa->spill_loc & 3) ? 1 : 4;
        int status = xtensa_read_memory(target, xtensa->spill_loc, memop_size,
                xtensa->spill_bytes / memop_size, xtensa->spill_buf);
        if (status != ERROR_OK) {
                LOG_ERROR("Spill memory save");
                error = XT_QERR_MEM;
                goto xtensa_gdbqc_qxtreg_fail;
        }
        if (iswrite) {
                /* Extract value and store in spill memory */
                unsigned int b = 0;
                char *valbuf = strchr(delim, '=');
                if (!(valbuf && (*valbuf == '='))) {
                        LOG_ERROR("Malformed Qxtreg packet");
                        error = XT_QERR_INVAL;
                        goto xtensa_gdbqc_qxtreg_fail;
                }
                valbuf++;
                while (*valbuf && *(valbuf + 1)) {
                        char bytestr[3] = { 0, 0, 0 };
                        strncpy(bytestr, valbuf, 2);
                        regbuf[b++] = strtoul(bytestr, NULL, 16);
                        valbuf += 2;
                }
                if (b != reglen) {
                        LOG_ERROR("Malformed Qxtreg packet");
                        error = XT_QERR_INVAL;
                        goto xtensa_gdbqc_qxtreg_fail;
                }
                status = xtensa_write_memory(target, xtensa->spill_loc, memop_size,
                        reglen / memop_size, regbuf);
                if (status != ERROR_OK) {
                        LOG_ERROR("TIE value store");
                        error = XT_QERR_MEM;
                        goto xtensa_gdbqc_qxtreg_fail;
                }
        }
        xtensa_reg_val_t orig_a4 = xtensa_reg_get(target, XT_REG_IDX_A4);
        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, xtensa->spill_loc);
        xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A4));

        int32_t tieop_status = xtensa_gdbqc_parse_exec_tie_ops(target, delim);

        /* Restore a4 but not yet spill memory.  Execute it all... */
        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, orig_a4);
        xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A4));
        status = xtensa_dm_queue_execute(&xtensa->dbg_mod);
        if (status != ERROR_OK) {
                LOG_TARGET_ERROR(target, "TIE queue execute: %d\n", status);
                tieop_status = status;
        }
        status = xtensa_core_status_check(target);
        if (status != ERROR_OK) {
                LOG_TARGET_ERROR(target, "TIE instr execute: %d\n", status);
                tieop_status = status;
        }

        if (tieop_status == ERROR_OK) {
                if (iswrite) {
                        /* TIE write succeeded; send OK */
                        strcpy(*response_p, "OK");
                } else {
                        /* TIE read succeeded; copy result from spill memory */
                        status = xtensa_read_memory(target, xtensa->spill_loc, memop_size, reglen, regbuf);
                        if (status != ERROR_OK) {
                                LOG_TARGET_ERROR(target, "TIE result read");
                                tieop_status = status;
                        }
                        unsigned int i;
                        for (i = 0; i < reglen; i++)
                                sprintf(*response_p + 2 * i, "%02x", regbuf[i]);
                        *(*response_p + 2 * i) = '\0';
                        LOG_TARGET_DEBUG(target, "TIE response: %s", *response_p);
                }
        }

        /* Restore spill memory first, then report any previous errors */
        status = xtensa_write_memory(target, xtensa->spill_loc, memop_size,
                xtensa->spill_bytes / memop_size, xtensa->spill_buf);
        if (status != ERROR_OK) {
                LOG_ERROR("Spill memory restore");
                error = XT_QERR_MEM;
                goto xtensa_gdbqc_qxtreg_fail;
        }
        if (tieop_status != ERROR_OK) {
                LOG_ERROR("TIE execution");
                error = XT_QERR_FAIL;
                goto xtensa_gdbqc_qxtreg_fail;
        }
        return ERROR_OK;

xtensa_gdbqc_qxtreg_fail:
        strcpy(*response_p, xt_qerr[error].chrval);
        return xt_qerr[error].intval;
}

int xtensa_gdb_query_custom(struct target *target, const char *packet, char **response_p)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        enum xtensa_qerr_e error;
        if (!packet || !response_p) {
                LOG_TARGET_ERROR(target, "invalid parameter: packet %p response_p %p", packet, response_p);
                return ERROR_FAIL;
        }

        *response_p = xtensa->qpkt_resp;
        if (strncmp(packet, "qxtn", 4) == 0) {
                strcpy(*response_p, "OpenOCD");
                return ERROR_OK;
        } else if (strncasecmp(packet, "qxtgdbversion=", 14) == 0) {
                return ERROR_OK;
        } else if ((strncmp(packet, "Qxtsis=", 7) == 0) || (strncmp(packet, "Qxtsds=", 7) == 0)) {
                /* Confirm host cache params match core .cfg file */
                struct xtensa_cache_config *cachep = (packet[4] == 'i') ?
                        &xtensa->core_config->icache : &xtensa->core_config->dcache;
                unsigned int line_size = 0, size = 0, way_count = 0;
                sscanf(&packet[7], "%x,%x,%x", &line_size, &size, &way_count);
                if ((cachep->line_size != line_size) ||
                        (cachep->size != size) ||
                        (cachep->way_count != way_count)) {
                        LOG_TARGET_WARNING(target, "%cCache mismatch; check xtensa-core-XXX.cfg file",
                                cachep == &xtensa->core_config->icache ? 'I' : 'D');
                }
                strcpy(*response_p, "OK");
                return ERROR_OK;
        } else if ((strncmp(packet, "Qxtiram=", 8) == 0) || (strncmp(packet, "Qxtirom=", 8) == 0)) {
                /* Confirm host IRAM/IROM params match core .cfg file */
                struct xtensa_local_mem_config *memp = (packet[5] == 'a') ?
                        &xtensa->core_config->iram : &xtensa->core_config->irom;
                unsigned int base = 0, size = 0, i;
                char *pkt = (char *)&packet[7];
                do {
                        pkt++;
                        size = strtoul(pkt, &pkt, 16);
                        pkt++;
                        base = strtoul(pkt, &pkt, 16);
                        LOG_TARGET_DEBUG(target, "memcheck: %dB @ 0x%08x", size, base);
                        for (i = 0; i < memp->count; i++) {
                                if ((memp->regions[i].base == base) && (memp->regions[i].size == size))
                                        break;
                        }
                        if (i == memp->count) {
                                LOG_TARGET_WARNING(target, "%s mismatch; check xtensa-core-XXX.cfg file",
                                        memp == &xtensa->core_config->iram ? "IRAM" : "IROM");
                                break;
                        }
                        for (i = 0; i < 11; i++) {
                                pkt++;
                                strtoul(pkt, &pkt, 16);
                        }
                } while (pkt && (pkt[0] == ','));
                strcpy(*response_p, "OK");
                return ERROR_OK;
        } else if (strncmp(packet, "Qxtexcmlvl=", 11) == 0) {
                /* Confirm host EXCM_LEVEL matches core .cfg file */
                unsigned int excm_level = strtoul(&packet[11], NULL, 0);
                if (!xtensa->core_config->high_irq.enabled ||
                        (excm_level != xtensa->core_config->high_irq.excm_level))
                        LOG_TARGET_WARNING(target, "EXCM_LEVEL mismatch; check xtensa-core-XXX.cfg file");
                strcpy(*response_p, "OK");
                return ERROR_OK;
        } else if ((strncmp(packet, "Qxtl2cs=", 8) == 0) ||
                (strncmp(packet, "Qxtl2ca=", 8) == 0) ||
                (strncmp(packet, "Qxtdensity=", 11) == 0)) {
                strcpy(*response_p, "OK");
                return ERROR_OK;
        } else if (strncmp(packet, "Qxtspill=", 9) == 0) {
                char *delim;
                uint32_t spill_loc = strtoul(packet + 9, &delim, 16);
                if (*delim != ':') {
                        LOG_ERROR("Malformed Qxtspill packet");
                        error = XT_QERR_INVAL;
                        goto xtensa_gdb_query_custom_fail;
                }
                xtensa->spill_loc = spill_loc;
                xtensa->spill_bytes = strtoul(delim + 1, NULL, 16);
                if (xtensa->spill_buf)
                        free(xtensa->spill_buf);
                xtensa->spill_buf = calloc(1, xtensa->spill_bytes);
                if (!xtensa->spill_buf) {
                        LOG_ERROR("Spill buf alloc");
                        error = XT_QERR_MEM;
                        goto xtensa_gdb_query_custom_fail;
                }
                LOG_TARGET_DEBUG(target, "Set spill 0x%08" PRIx32 " (%d)", xtensa->spill_loc, xtensa->spill_bytes);
                strcpy(*response_p, "OK");
                return ERROR_OK;
        } else if (strncasecmp(packet, "qxtreg", 6) == 0) {
                return xtensa_gdbqc_qxtreg(target, packet, response_p);
        } else if ((strncmp(packet, "qTStatus", 8) == 0) ||
                (strncmp(packet, "qxtftie", 7) == 0) ||
                (strncmp(packet, "qxtstie", 7) == 0)) {
                /* Return empty string to indicate trace, TIE wire debug are unsupported */
                strcpy(*response_p, "");
                return ERROR_OK;
        }

        /* Warn for all other queries, but do not return errors */
        LOG_TARGET_WARNING(target, "Unknown target-specific query packet: %s", packet);
        strcpy(*response_p, "");
        return ERROR_OK;

xtensa_gdb_query_custom_fail:
        strcpy(*response_p, xt_qerr[error].chrval);
        return xt_qerr[error].intval;
}

int xtensa_init_arch_info(struct target *target, struct xtensa *xtensa,
        const struct xtensa_debug_module_config *dm_cfg)
{
        target->arch_info = xtensa;
        xtensa->common_magic = XTENSA_COMMON_MAGIC;
        xtensa->target = target;
        xtensa->stepping_isr_mode = XT_STEPPING_ISR_ON;

        xtensa->core_config = calloc(1, sizeof(struct xtensa_config));
        if (!xtensa->core_config) {
                LOG_ERROR("Xtensa configuration alloc failed\n");
                return ERROR_FAIL;
        }

        /* Default cache settings are disabled with 1 way */
        xtensa->core_config->icache.way_count = 1;
        xtensa->core_config->dcache.way_count = 1;

        /* chrval: AR3/AR4 register names will change with window mapping.
         * intval: tracks whether scratch register was set through gdb P packet.
         */
        for (enum xtensa_ar_scratch_set_e s = 0; s < XT_AR_SCRATCH_NUM; s++) {
                xtensa->scratch_ars[s].chrval = calloc(8, sizeof(char));
                if (!xtensa->scratch_ars[s].chrval) {
                        for (enum xtensa_ar_scratch_set_e f = 0; f < s; f++)
                                free(xtensa->scratch_ars[f].chrval);
                        free(xtensa->core_config);
                        LOG_ERROR("Xtensa scratch AR alloc failed\n");
                        return ERROR_FAIL;
                }
                xtensa->scratch_ars[s].intval = false;
                sprintf(xtensa->scratch_ars[s].chrval, "%s%d",
                        ((s == XT_AR_SCRATCH_A3) || (s == XT_AR_SCRATCH_A4)) ? "a" : "ar",
                        ((s == XT_AR_SCRATCH_A3) || (s == XT_AR_SCRATCH_AR3)) ? 3 : 4);
        }

        return xtensa_dm_init(&xtensa->dbg_mod, dm_cfg);
}

void xtensa_set_permissive_mode(struct target *target, bool state)
{
        target_to_xtensa(target)->permissive_mode = state;
}

int xtensa_target_init(struct command_context *cmd_ctx, struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);

        xtensa->come_online_probes_num = 3;
        xtensa->hw_brps = calloc(XT_HW_IBREAK_MAX_NUM, sizeof(struct breakpoint *));
        if (!xtensa->hw_brps) {
                LOG_ERROR("Failed to alloc memory for HW breakpoints!");
                return ERROR_FAIL;
        }
        xtensa->hw_wps = calloc(XT_HW_DBREAK_MAX_NUM, sizeof(struct watchpoint *));
        if (!xtensa->hw_wps) {
                free(xtensa->hw_brps);
                LOG_ERROR("Failed to alloc memory for HW watchpoints!");
                return ERROR_FAIL;
        }
        xtensa->sw_brps = calloc(XT_SW_BREAKPOINTS_MAX_NUM, sizeof(struct xtensa_sw_breakpoint));
        if (!xtensa->sw_brps) {
                free(xtensa->hw_brps);
                free(xtensa->hw_wps);
                LOG_ERROR("Failed to alloc memory for SW breakpoints!");
                return ERROR_FAIL;
        }

        xtensa->spill_loc = 0xffffffff;
        xtensa->spill_bytes = 0;
        xtensa->spill_buf = NULL;
        xtensa->probe_lsddr32p = -1;    /* Probe for fast load/store operations */

        return xtensa_build_reg_cache(target);
}

static void xtensa_free_reg_cache(struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);
        struct reg_cache *cache = xtensa->core_cache;

        if (cache) {
                register_unlink_cache(&target->reg_cache, cache);
                for (unsigned int i = 0; i < cache->num_regs; i++) {
                        free(xtensa->algo_context_backup[i]);
                        free(cache->reg_list[i].value);
                }
                free(xtensa->algo_context_backup);
                free(cache->reg_list);
                free(cache);
        }
        xtensa->core_cache = NULL;
        xtensa->algo_context_backup = NULL;

        if (xtensa->empty_regs) {
                for (unsigned int i = 0; i < xtensa->dbregs_num; i++) {
                        free((void *)xtensa->empty_regs[i].name);
                        free(xtensa->empty_regs[i].value);
                }
                free(xtensa->empty_regs);
        }
        xtensa->empty_regs = NULL;
        if (xtensa->optregs) {
                for (unsigned int i = 0; i < xtensa->num_optregs; i++)
                        free((void *)xtensa->optregs[i].name);
                free(xtensa->optregs);
        }
        xtensa->optregs = NULL;
}

void xtensa_target_deinit(struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);

        LOG_DEBUG("start");

        if (target_was_examined(target)) {
                int ret = xtensa_queue_dbg_reg_write(xtensa, XDMREG_DCRCLR, OCDDCR_ENABLEOCD);
                if (ret != ERROR_OK) {
                        LOG_ERROR("Failed to queue OCDDCR_ENABLEOCD clear operation!");
                        return;
                }
                xtensa_dm_queue_tdi_idle(&xtensa->dbg_mod);
                ret = xtensa_dm_queue_execute(&xtensa->dbg_mod);
                if (ret != ERROR_OK) {
                        LOG_ERROR("Failed to clear OCDDCR_ENABLEOCD!");
                        return;
                }
                xtensa_dm_deinit(&xtensa->dbg_mod);
        }
        xtensa_free_reg_cache(target);
        free(xtensa->hw_brps);
        free(xtensa->hw_wps);
        free(xtensa->sw_brps);
        if (xtensa->spill_buf) {
                free(xtensa->spill_buf);
                xtensa->spill_buf = NULL;
        }
        for (enum xtensa_ar_scratch_set_e s = 0; s < XT_AR_SCRATCH_NUM; s++)
                free(xtensa->scratch_ars[s].chrval);
        free(xtensa->core_config);
}

const char *xtensa_get_gdb_arch(struct target *target)
{
        return "xtensa";
}

/* exe <ascii-encoded hexadecimal instruction bytes> */
static COMMAND_HELPER(xtensa_cmd_exe_do, struct target *target)
{
        struct xtensa *xtensa = target_to_xtensa(target);

        if (CMD_ARGC != 1)
                return ERROR_COMMAND_SYNTAX_ERROR;

        /* Process ascii-encoded hex byte string */
        const char *parm = CMD_ARGV[0];
        unsigned int parm_len = strlen(parm);
        if ((parm_len >= 64) || (parm_len & 1)) {
                LOG_ERROR("Invalid parameter length (%d): must be even, < 64 characters", parm_len);
                return ERROR_FAIL;
        }

        uint8_t ops[32];
        memset(ops, 0, 32);
        unsigned int oplen = parm_len / 2;
        char encoded_byte[3] = { 0, 0, 0 };
        for (unsigned int i = 0; i < oplen; i++) {
                encoded_byte[0] = *parm++;
                encoded_byte[1] = *parm++;
                ops[i] = strtoul(encoded_byte, NULL, 16);
        }

        /* GDB must handle state save/restore.
         * Flush reg cache in case spill location is in an AR
         * Update CPENABLE only for this execution; later restore cached copy
         * Keep a copy of exccause in case executed code triggers an exception
         */
        int status = xtensa_write_dirty_registers(target);
        if (status != ERROR_OK) {
                LOG_ERROR("%s: Failed to write back register cache.", target_name(target));
                return ERROR_FAIL;
        }
        xtensa_reg_val_t exccause = xtensa_reg_get(target, XT_REG_IDX_EXCCAUSE);
        xtensa_reg_val_t cpenable = xtensa_reg_get(target, XT_REG_IDX_CPENABLE);
        xtensa_reg_val_t a3 = xtensa_reg_get(target, XT_REG_IDX_A3);
        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, 0xffffffff);
        xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));
        xtensa_queue_exec_ins(xtensa, XT_INS_WSR(xtensa,
                        xtensa_regs[XT_REG_IDX_CPENABLE].reg_num, XT_REG_A3));
        xtensa_queue_dbg_reg_write(xtensa, XDMREG_DDR, a3);
        xtensa_queue_exec_ins(xtensa, XT_INS_RSR(xtensa, XT_SR_DDR, XT_REG_A3));

        /* Queue instruction list and execute everything */
        LOG_TARGET_DEBUG(target, "execute stub: %s", CMD_ARGV[0]);
        xtensa_queue_exec_ins_wide(xtensa, ops, oplen); /* Handles endian-swap */
        status = xtensa_dm_queue_execute(&xtensa->dbg_mod);
        if (status != ERROR_OK)
                LOG_TARGET_ERROR(target, "TIE queue execute: %d\n", status);
        status = xtensa_core_status_check(target);
        if (status != ERROR_OK)
                LOG_TARGET_ERROR(target, "TIE instr execute: %d\n", status);

        /* Reread register cache and restore saved regs after instruction execution */
        if (xtensa_fetch_all_regs(target) != ERROR_OK)
                LOG_TARGET_ERROR(target, "%s: Failed to fetch register cache (post-exec).", target_name(target));
        xtensa_reg_set(target, XT_REG_IDX_EXCCAUSE, exccause);
        xtensa_reg_set(target, XT_REG_IDX_CPENABLE, cpenable);
        return status;
}

COMMAND_HANDLER(xtensa_cmd_exe)
{
        return CALL_COMMAND_HANDLER(xtensa_cmd_exe_do, get_current_target(CMD_CTX));
}

/* xtdef <name> */
COMMAND_HELPER(xtensa_cmd_xtdef_do, struct xtensa *xtensa)
{
        if (CMD_ARGC != 1)
                return ERROR_COMMAND_SYNTAX_ERROR;

        const char *core_name = CMD_ARGV[0];
        if (strcasecmp(core_name, "LX") == 0) {
                xtensa->core_config->core_type = XT_LX;
        } else {
                LOG_ERROR("xtdef [LX]\n");
                return ERROR_COMMAND_SYNTAX_ERROR;
        }
        return ERROR_OK;
}

COMMAND_HANDLER(xtensa_cmd_xtdef)
{
        return CALL_COMMAND_HANDLER(xtensa_cmd_xtdef_do,
                target_to_xtensa(get_current_target(CMD_CTX)));
}

static inline bool xtensa_cmd_xtopt_legal_val(char *opt, int val, int min, int max)
{
        if ((val < min) || (val > max)) {
                LOG_ERROR("xtopt %s (%d) out of range [%d..%d]\n", opt, val, min, max);
                return false;
        }
        return true;
}

/* xtopt <name> <value> */
COMMAND_HELPER(xtensa_cmd_xtopt_do, struct xtensa *xtensa)
{
        if (CMD_ARGC != 2)
                return ERROR_COMMAND_SYNTAX_ERROR;

        const char *opt_name = CMD_ARGV[0];
        int opt_val = strtol(CMD_ARGV[1], NULL, 0);
        if (strcasecmp(opt_name, "arnum") == 0) {
                if (!xtensa_cmd_xtopt_legal_val("arnum", opt_val, 0, 64))
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                xtensa->core_config->aregs_num = opt_val;
        } else if (strcasecmp(opt_name, "windowed") == 0) {
                if (!xtensa_cmd_xtopt_legal_val("windowed", opt_val, 0, 1))
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                xtensa->core_config->windowed = opt_val;
        } else if (strcasecmp(opt_name, "cpenable") == 0) {
                if (!xtensa_cmd_xtopt_legal_val("cpenable", opt_val, 0, 1))
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                xtensa->core_config->coproc = opt_val;
        } else if (strcasecmp(opt_name, "exceptions") == 0) {
                if (!xtensa_cmd_xtopt_legal_val("exceptions", opt_val, 0, 1))
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                xtensa->core_config->exceptions = opt_val;
        } else if (strcasecmp(opt_name, "intnum") == 0) {
                if (!xtensa_cmd_xtopt_legal_val("intnum", opt_val, 0, 32))
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                xtensa->core_config->irq.enabled = (opt_val > 0);
                xtensa->core_config->irq.irq_num = opt_val;
        } else if (strcasecmp(opt_name, "hipriints") == 0) {
                if (!xtensa_cmd_xtopt_legal_val("hipriints", opt_val, 0, 1))
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                xtensa->core_config->high_irq.enabled = opt_val;
        } else if (strcasecmp(opt_name, "excmlevel") == 0) {
                if (!xtensa_cmd_xtopt_legal_val("excmlevel", opt_val, 1, 6))
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                if (!xtensa->core_config->high_irq.enabled) {
                        LOG_ERROR("xtopt excmlevel requires hipriints\n");
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                }
                xtensa->core_config->high_irq.excm_level = opt_val;
        } else if (strcasecmp(opt_name, "intlevels") == 0) {
                if (xtensa->core_config->core_type == XT_LX) {
                        if (!xtensa_cmd_xtopt_legal_val("intlevels", opt_val, 2, 6))
                                return ERROR_COMMAND_ARGUMENT_INVALID;
                } else {
                        if (!xtensa_cmd_xtopt_legal_val("intlevels", opt_val, 1, 255))
                                return ERROR_COMMAND_ARGUMENT_INVALID;
                }
                if (!xtensa->core_config->high_irq.enabled) {
                        LOG_ERROR("xtopt intlevels requires hipriints\n");
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                }
                xtensa->core_config->high_irq.level_num = opt_val;
        } else if (strcasecmp(opt_name, "debuglevel") == 0) {
                if (xtensa->core_config->core_type == XT_LX) {
                        if (!xtensa_cmd_xtopt_legal_val("debuglevel", opt_val, 2, 6))
                                return ERROR_COMMAND_ARGUMENT_INVALID;
                } else {
                        if (!xtensa_cmd_xtopt_legal_val("debuglevel", opt_val, 0, 0))
                                return ERROR_COMMAND_ARGUMENT_INVALID;
                }
                xtensa->core_config->debug.enabled = 1;
                xtensa->core_config->debug.irq_level = opt_val;
        } else if (strcasecmp(opt_name, "ibreaknum") == 0) {
                if (!xtensa_cmd_xtopt_legal_val("ibreaknum", opt_val, 0, 2))
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                xtensa->core_config->debug.ibreaks_num = opt_val;
        } else if (strcasecmp(opt_name, "dbreaknum") == 0) {
                if (!xtensa_cmd_xtopt_legal_val("dbreaknum", opt_val, 0, 2))
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                xtensa->core_config->debug.dbreaks_num = opt_val;
        } else if (strcasecmp(opt_name, "tracemem") == 0) {
                if (!xtensa_cmd_xtopt_legal_val("tracemem", opt_val, 0, 256 * 1024))
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                xtensa->core_config->trace.mem_sz = opt_val;
                xtensa->core_config->trace.enabled = (opt_val > 0);
        } else if (strcasecmp(opt_name, "tracememrev") == 0) {
                if (!xtensa_cmd_xtopt_legal_val("tracememrev", opt_val, 0, 1))
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                xtensa->core_config->trace.reversed_mem_access = opt_val;
        } else if (strcasecmp(opt_name, "perfcount") == 0) {
                if (!xtensa_cmd_xtopt_legal_val("perfcount", opt_val, 0, 8))
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                xtensa->core_config->debug.perfcount_num = opt_val;
        } else {
                LOG_WARNING("Unknown xtensa command ignored: \"xtopt %s %s\"", CMD_ARGV[0], CMD_ARGV[1]);
                return ERROR_OK;
        }

        return ERROR_OK;
}

COMMAND_HANDLER(xtensa_cmd_xtopt)
{
        return CALL_COMMAND_HANDLER(xtensa_cmd_xtopt_do,
                target_to_xtensa(get_current_target(CMD_CTX)));
}

/* xtmem <type> [parameters] */
COMMAND_HELPER(xtensa_cmd_xtmem_do, struct xtensa *xtensa)
{
        struct xtensa_cache_config *cachep = NULL;
        struct xtensa_local_mem_config *memp = NULL;
        int mem_access = 0;
        bool is_dcache = false;

        if (CMD_ARGC == 0) {
                LOG_ERROR("xtmem <type> [parameters]\n");
                return ERROR_COMMAND_SYNTAX_ERROR;
        }

        const char *mem_name = CMD_ARGV[0];
        if (strcasecmp(mem_name, "icache") == 0) {
                cachep = &xtensa->core_config->icache;
        } else if (strcasecmp(mem_name, "dcache") == 0) {
                cachep = &xtensa->core_config->dcache;
                is_dcache = true;
        } else if (strcasecmp(mem_name, "l2cache") == 0) {
                /* TODO: support L2 cache */
        } else if (strcasecmp(mem_name, "l2addr") == 0) {
                /* TODO: support L2 cache */
        } else if (strcasecmp(mem_name, "iram") == 0) {
                memp = &xtensa->core_config->iram;
                mem_access = XT_MEM_ACCESS_READ | XT_MEM_ACCESS_WRITE;
        } else if (strcasecmp(mem_name, "dram") == 0) {
                memp = &xtensa->core_config->dram;
                mem_access = XT_MEM_ACCESS_READ | XT_MEM_ACCESS_WRITE;
        } else if (strcasecmp(mem_name, "sram") == 0) {
                memp = &xtensa->core_config->sram;
                mem_access = XT_MEM_ACCESS_READ | XT_MEM_ACCESS_WRITE;
        } else if (strcasecmp(mem_name, "irom") == 0) {
                memp = &xtensa->core_config->irom;
                mem_access = XT_MEM_ACCESS_READ;
        } else if (strcasecmp(mem_name, "drom") == 0) {
                memp = &xtensa->core_config->drom;
                mem_access = XT_MEM_ACCESS_READ;
        } else if (strcasecmp(mem_name, "srom") == 0) {
                memp = &xtensa->core_config->srom;
                mem_access = XT_MEM_ACCESS_READ;
        } else {
                LOG_ERROR("xtmem types: <icache|dcache|l2cache|l2addr|iram|irom|dram|drom|sram|srom>\n");
                return ERROR_COMMAND_ARGUMENT_INVALID;
        }

        if (cachep) {
                if ((CMD_ARGC != 4) && (CMD_ARGC != 5)) {
                        LOG_ERROR("xtmem <cachetype> <linebytes> <cachebytes> <ways> [writeback]\n");
                        return ERROR_COMMAND_SYNTAX_ERROR;
                }
                cachep->line_size = strtoul(CMD_ARGV[1], NULL, 0);
                cachep->size = strtoul(CMD_ARGV[2], NULL, 0);
                cachep->way_count = strtoul(CMD_ARGV[3], NULL, 0);
                cachep->writeback = ((CMD_ARGC == 5) && is_dcache) ?
                        strtoul(CMD_ARGV[4], NULL, 0) : 0;
        } else if (memp) {
                if (CMD_ARGC != 3) {
                        LOG_ERROR("xtmem <memtype> <baseaddr> <bytes>\n");
                        return ERROR_COMMAND_SYNTAX_ERROR;
                }
                struct xtensa_local_mem_region_config *memcfgp = &memp->regions[memp->count];
                memcfgp->base = strtoul(CMD_ARGV[1], NULL, 0);
                memcfgp->size = strtoul(CMD_ARGV[2], NULL, 0);
                memcfgp->access = mem_access;
                memp->count++;
        }

        return ERROR_OK;
}

COMMAND_HANDLER(xtensa_cmd_xtmem)
{
        return CALL_COMMAND_HANDLER(xtensa_cmd_xtmem_do,
                target_to_xtensa(get_current_target(CMD_CTX)));
}

/* xtmpu <num FG seg> <min seg size> <lockable> <executeonly> */
COMMAND_HELPER(xtensa_cmd_xtmpu_do, struct xtensa *xtensa)
{
        if (CMD_ARGC != 4) {
                LOG_ERROR("xtmpu <num FG seg> <min seg size> <lockable> <executeonly>\n");
                return ERROR_COMMAND_SYNTAX_ERROR;
        }

        unsigned int nfgseg = strtoul(CMD_ARGV[0], NULL, 0);
        unsigned int minsegsize = strtoul(CMD_ARGV[1], NULL, 0);
        unsigned int lockable = strtoul(CMD_ARGV[2], NULL, 0);
        unsigned int execonly = strtoul(CMD_ARGV[3], NULL, 0);

        if ((nfgseg > 32)) {
                LOG_ERROR("<nfgseg> must be within [0..32]\n");
                return ERROR_COMMAND_ARGUMENT_INVALID;
        } else if (minsegsize & (minsegsize - 1)) {
                LOG_ERROR("<minsegsize> must be a power of 2 >= 32\n");
                return ERROR_COMMAND_ARGUMENT_INVALID;
        } else if (lockable > 1) {
                LOG_ERROR("<lockable> must be 0 or 1\n");
                return ERROR_COMMAND_ARGUMENT_INVALID;
        } else if (execonly > 1) {
                LOG_ERROR("<execonly> must be 0 or 1\n");
                return ERROR_COMMAND_ARGUMENT_INVALID;
        }

        xtensa->core_config->mpu.enabled = true;
        xtensa->core_config->mpu.nfgseg = nfgseg;
        xtensa->core_config->mpu.minsegsize = minsegsize;
        xtensa->core_config->mpu.lockable = lockable;
        xtensa->core_config->mpu.execonly = execonly;
        return ERROR_OK;
}

COMMAND_HANDLER(xtensa_cmd_xtmpu)
{
        return CALL_COMMAND_HANDLER(xtensa_cmd_xtmpu_do,
                target_to_xtensa(get_current_target(CMD_CTX)));
}

/* xtmmu <NIREFILLENTRIES> <NDREFILLENTRIES> <IVARWAY56> <DVARWAY56> */
COMMAND_HELPER(xtensa_cmd_xtmmu_do, struct xtensa *xtensa)
{
        if (CMD_ARGC != 2) {
                LOG_ERROR("xtmmu <NIREFILLENTRIES> <NDREFILLENTRIES>\n");
                return ERROR_COMMAND_SYNTAX_ERROR;
        }

        unsigned int nirefillentries = strtoul(CMD_ARGV[0], NULL, 0);
        unsigned int ndrefillentries = strtoul(CMD_ARGV[1], NULL, 0);
        if ((nirefillentries != 16) && (nirefillentries != 32)) {
                LOG_ERROR("<nirefillentries> must be 16 or 32\n");
                return ERROR_COMMAND_ARGUMENT_INVALID;
        } else if ((ndrefillentries != 16) && (ndrefillentries != 32)) {
                LOG_ERROR("<ndrefillentries> must be 16 or 32\n");
                return ERROR_COMMAND_ARGUMENT_INVALID;
        }

        xtensa->core_config->mmu.enabled = true;
        xtensa->core_config->mmu.itlb_entries_count = nirefillentries;
        xtensa->core_config->mmu.dtlb_entries_count = ndrefillentries;
        return ERROR_OK;
}

COMMAND_HANDLER(xtensa_cmd_xtmmu)
{
        return CALL_COMMAND_HANDLER(xtensa_cmd_xtmmu_do,
                target_to_xtensa(get_current_target(CMD_CTX)));
}

/* xtregs <numregs>
 * xtreg <regname> <regnum> */
COMMAND_HELPER(xtensa_cmd_xtreg_do, struct xtensa *xtensa)
{
        if (CMD_ARGC == 1) {
                int32_t numregs = strtoul(CMD_ARGV[0], NULL, 0);
                if ((numregs <= 0) || (numregs > UINT16_MAX)) {
                        LOG_ERROR("xtreg <numregs>: Invalid 'numregs' (%d)", numregs);
                        return ERROR_COMMAND_SYNTAX_ERROR;
                }
                if ((xtensa->genpkt_regs_num > 0) && (numregs < (int32_t)xtensa->genpkt_regs_num)) {
                        LOG_ERROR("xtregs (%d) must be larger than numgenregs (%d) (if xtregfmt specified)",
                                numregs, xtensa->genpkt_regs_num);
                        return ERROR_COMMAND_SYNTAX_ERROR;
                }
                xtensa->total_regs_num = numregs;
                xtensa->core_regs_num = 0;
                xtensa->num_optregs = 0;
                /* A little more memory than required, but saves a second initialization pass */
                xtensa->optregs = calloc(xtensa->total_regs_num, sizeof(struct xtensa_reg_desc));
                if (!xtensa->optregs) {
                        LOG_ERROR("Failed to allocate xtensa->optregs!");
                        return ERROR_FAIL;
                }
                return ERROR_OK;
        } else if (CMD_ARGC != 2) {
                return ERROR_COMMAND_SYNTAX_ERROR;
        }

        /* "xtregfmt contiguous" must be specified prior to the first "xtreg" definition
         * if general register (g-packet) requests or contiguous register maps are supported */
        if (xtensa->regmap_contiguous && !xtensa->contiguous_regs_desc) {
                xtensa->contiguous_regs_desc = calloc(xtensa->total_regs_num, sizeof(struct xtensa_reg_desc *));
                if (!xtensa->contiguous_regs_desc) {
                        LOG_ERROR("Failed to allocate xtensa->contiguous_regs_desc!");
                        return ERROR_FAIL;
                }
        }

        const char *regname = CMD_ARGV[0];
        unsigned int regnum = strtoul(CMD_ARGV[1], NULL, 0);
        if (regnum > UINT16_MAX) {
                LOG_ERROR("<regnum> must be a 16-bit number");
                return ERROR_COMMAND_ARGUMENT_INVALID;
        }

        if ((xtensa->num_optregs + xtensa->core_regs_num) >= xtensa->total_regs_num) {
                if (xtensa->total_regs_num)
                        LOG_ERROR("'xtreg %s 0x%04x': Too many registers (%d expected, %d core %d extended)",
                                regname, regnum,
                                xtensa->total_regs_num, xtensa->core_regs_num, xtensa->num_optregs);
                else
                        LOG_ERROR("'xtreg %s 0x%04x': Number of registers unspecified",
                                regname, regnum);
                return ERROR_FAIL;
        }

        /* Determine whether register belongs in xtensa_regs[] or xtensa->xtensa_spec_regs[] */
        struct xtensa_reg_desc *rptr = &xtensa->optregs[xtensa->num_optregs];
        bool is_extended_reg = true;
        unsigned int ridx;
        for (ridx = 0; ridx < XT_NUM_REGS; ridx++) {
                if (strcmp(CMD_ARGV[0], xtensa_regs[ridx].name) == 0) {
                        /* Flag core register as defined */
                        rptr = &xtensa_regs[ridx];
                        xtensa->core_regs_num++;
                        is_extended_reg = false;
                        break;
                }
        }

        rptr->exist = true;
        if (is_extended_reg) {
                /* Register ID, debugger-visible register ID */
                rptr->name = strdup(CMD_ARGV[0]);
                rptr->dbreg_num = regnum;
                rptr->reg_num = (regnum & XT_REG_INDEX_MASK);
                xtensa->num_optregs++;

                /* Register type */
                if ((regnum & XT_REG_GENERAL_MASK) == XT_REG_GENERAL_VAL) {
                        rptr->type = XT_REG_GENERAL;
                } else if ((regnum & XT_REG_USER_MASK) == XT_REG_USER_VAL) {
                        rptr->type = XT_REG_USER;
                } else if ((regnum & XT_REG_FR_MASK) == XT_REG_FR_VAL) {
                        rptr->type = XT_REG_FR;
                } else if ((regnum & XT_REG_SPECIAL_MASK) == XT_REG_SPECIAL_VAL) {
                        rptr->type = XT_REG_SPECIAL;
                } else if ((regnum & XT_REG_RELGEN_MASK) == XT_REG_RELGEN_VAL) {
                        /* WARNING: For these registers, regnum points to the
                         * index of the corresponding ARx registers, NOT to
                         * the processor register number! */
                        rptr->type = XT_REG_RELGEN;
                        rptr->reg_num += XT_REG_IDX_ARFIRST;
                        rptr->dbreg_num += XT_REG_IDX_ARFIRST;
                } else if ((regnum & XT_REG_TIE_MASK) != 0) {
                        rptr->type = XT_REG_TIE;
                } else {
                        rptr->type = XT_REG_OTHER;
                }

                /* Register flags */
                if ((strcmp(rptr->name, "mmid") == 0) || (strcmp(rptr->name, "eraccess") == 0) ||
                        (strcmp(rptr->name, "ddr") == 0) || (strcmp(rptr->name, "intset") == 0) ||
                        (strcmp(rptr->name, "intclear") == 0))
                        rptr->flags = XT_REGF_NOREAD;
                else
                        rptr->flags = 0;

                if (rptr->reg_num == (XT_EPS_REG_NUM_BASE + xtensa->core_config->debug.irq_level) &&
                        xtensa->core_config->core_type == XT_LX && rptr->type == XT_REG_SPECIAL) {
                        xtensa->eps_dbglevel_idx = XT_NUM_REGS + xtensa->num_optregs - 1;
                        LOG_DEBUG("Setting PS (%s) index to %d", rptr->name, xtensa->eps_dbglevel_idx);
                }
        } else if (strcmp(rptr->name, "cpenable") == 0) {
                xtensa->core_config->coproc = true;
        }

        /* Build out list of contiguous registers in specified order */
        unsigned int running_reg_count = xtensa->num_optregs + xtensa->core_regs_num;
        if (xtensa->contiguous_regs_desc) {
                assert((running_reg_count <= xtensa->total_regs_num) && "contiguous register address internal error!");
                xtensa->contiguous_regs_desc[running_reg_count - 1] = rptr;
        }
        if (xtensa_extra_debug_log)
                LOG_DEBUG("Added %s register %-16s: 0x%04x/0x%02x t%d (%d of %d)",
                        is_extended_reg ? "config-specific" : "core",
                        rptr->name, rptr->dbreg_num, rptr->reg_num, rptr->type,
                        is_extended_reg ? xtensa->num_optregs : ridx,
                        is_extended_reg ? xtensa->total_regs_num : XT_NUM_REGS);
        return ERROR_OK;
}

COMMAND_HANDLER(xtensa_cmd_xtreg)
{
        return CALL_COMMAND_HANDLER(xtensa_cmd_xtreg_do,
                target_to_xtensa(get_current_target(CMD_CTX)));
}

/* xtregfmt <contiguous|sparse> [numgregs] */
COMMAND_HELPER(xtensa_cmd_xtregfmt_do, struct xtensa *xtensa)
{
        if ((CMD_ARGC == 1) || (CMD_ARGC == 2)) {
                if (!strcasecmp(CMD_ARGV[0], "sparse")) {
                        return ERROR_OK;
                } else if (!strcasecmp(CMD_ARGV[0], "contiguous")) {
                        xtensa->regmap_contiguous = true;
                        if (CMD_ARGC == 2) {
                                unsigned int numgregs = strtoul(CMD_ARGV[1], NULL, 0);
                                if ((numgregs <= 0) ||
                                        ((numgregs > xtensa->total_regs_num) &&
                                        (xtensa->total_regs_num > 0))) {
                                        LOG_ERROR("xtregfmt: if specified, numgregs (%d) must be <= numregs (%d)",
                                                numgregs, xtensa->total_regs_num);
                                        return ERROR_COMMAND_SYNTAX_ERROR;
                                }
                                xtensa->genpkt_regs_num = numgregs;
                        }
                        return ERROR_OK;
                }
        }
        return ERROR_COMMAND_SYNTAX_ERROR;
}

COMMAND_HANDLER(xtensa_cmd_xtregfmt)
{
        return CALL_COMMAND_HANDLER(xtensa_cmd_xtregfmt_do,
                target_to_xtensa(get_current_target(CMD_CTX)));
}

COMMAND_HELPER(xtensa_cmd_permissive_mode_do, struct xtensa *xtensa)
{
        return CALL_COMMAND_HANDLER(handle_command_parse_bool,
                &xtensa->permissive_mode, "xtensa permissive mode");
}

COMMAND_HANDLER(xtensa_cmd_permissive_mode)
{
        return CALL_COMMAND_HANDLER(xtensa_cmd_permissive_mode_do,
                target_to_xtensa(get_current_target(CMD_CTX)));
}

/* perfmon_enable <counter_id> <select> [mask] [kernelcnt] [tracelevel] */
COMMAND_HELPER(xtensa_cmd_perfmon_enable_do, struct xtensa *xtensa)
{
        struct xtensa_perfmon_config config = {
                .mask = 0xffff,
                .kernelcnt = 0,
                .tracelevel = -1        /* use DEBUGLEVEL by default */
        };

        if (CMD_ARGC < 2 || CMD_ARGC > 6)
                return ERROR_COMMAND_SYNTAX_ERROR;

        unsigned int counter_id = strtoul(CMD_ARGV[0], NULL, 0);
        if (counter_id >= XTENSA_MAX_PERF_COUNTERS) {
                command_print(CMD, "counter_id should be < %d", XTENSA_MAX_PERF_COUNTERS);
                return ERROR_COMMAND_ARGUMENT_INVALID;
        }

        config.select = strtoul(CMD_ARGV[1], NULL, 0);
        if (config.select > XTENSA_MAX_PERF_SELECT) {
                command_print(CMD, "select should be < %d", XTENSA_MAX_PERF_SELECT);
                return ERROR_COMMAND_ARGUMENT_INVALID;
        }

        if (CMD_ARGC >= 3) {
                config.mask = strtoul(CMD_ARGV[2], NULL, 0);
                if (config.mask > XTENSA_MAX_PERF_MASK) {
                        command_print(CMD, "mask should be < %d", XTENSA_MAX_PERF_MASK);
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                }
        }

        if (CMD_ARGC >= 4) {
                config.kernelcnt = strtoul(CMD_ARGV[3], NULL, 0);
                if (config.kernelcnt > 1) {
                        command_print(CMD, "kernelcnt should be 0 or 1");
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                }
        }

        if (CMD_ARGC >= 5) {
                config.tracelevel = strtoul(CMD_ARGV[4], NULL, 0);
                if (config.tracelevel > 7) {
                        command_print(CMD, "tracelevel should be <=7");
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                }
        }

        if (config.tracelevel == -1)
                config.tracelevel = xtensa->core_config->debug.irq_level;

        return xtensa_dm_perfmon_enable(&xtensa->dbg_mod, counter_id, &config);
}

COMMAND_HANDLER(xtensa_cmd_perfmon_enable)
{
        return CALL_COMMAND_HANDLER(xtensa_cmd_perfmon_enable_do,
                target_to_xtensa(get_current_target(CMD_CTX)));
}

/* perfmon_dump [counter_id] */
COMMAND_HELPER(xtensa_cmd_perfmon_dump_do, struct xtensa *xtensa)
{
        if (CMD_ARGC > 1)
                return ERROR_COMMAND_SYNTAX_ERROR;

        int counter_id = -1;
        if (CMD_ARGC == 1) {
                counter_id = strtol(CMD_ARGV[0], NULL, 0);
                if (counter_id > XTENSA_MAX_PERF_COUNTERS) {
                        command_print(CMD, "counter_id should be < %d", XTENSA_MAX_PERF_COUNTERS);
                        return ERROR_COMMAND_ARGUMENT_INVALID;
                }
        }

        unsigned int counter_start = (counter_id < 0) ? 0 : counter_id;
        unsigned int counter_end = (counter_id < 0) ? XTENSA_MAX_PERF_COUNTERS : counter_id + 1;
        for (unsigned int counter = counter_start; counter < counter_end; ++counter) {
                char result_buf[128] = { 0 };
                size_t result_pos = snprintf(result_buf, sizeof(result_buf), "Counter %d: ", counter);
                struct xtensa_perfmon_result result;
                int res = xtensa_dm_perfmon_dump(&xtensa->dbg_mod, counter, &result);
                if (res != ERROR_OK)
                        return res;
                snprintf(result_buf + result_pos, sizeof(result_buf) - result_pos,
                        "%-12" PRIu64 "%s",
                        result.value,
                        result.overflow ? " (overflow)" : "");
                LOG_INFO("%s", result_buf);
        }

        return ERROR_OK;
}

COMMAND_HANDLER(xtensa_cmd_perfmon_dump)
{
        return CALL_COMMAND_HANDLER(xtensa_cmd_perfmon_dump_do,
                target_to_xtensa(get_current_target(CMD_CTX)));
}

COMMAND_HELPER(xtensa_cmd_mask_interrupts_do, struct xtensa *xtensa)
{
        int state = -1;

        if (CMD_ARGC < 1) {
                const char *st;
                state = xtensa->stepping_isr_mode;
                if (state == XT_STEPPING_ISR_ON)
                        st = "OFF";
                else if (state == XT_STEPPING_ISR_OFF)
                        st = "ON";
                else
                        st = "UNKNOWN";
                command_print(CMD, "Current ISR step mode: %s", st);
                return ERROR_OK;
        }
        /* Masking is ON -> interrupts during stepping are OFF, and vice versa */
        if (!strcasecmp(CMD_ARGV[0], "off"))
                state = XT_STEPPING_ISR_ON;
        else if (!strcasecmp(CMD_ARGV[0], "on"))
                state = XT_STEPPING_ISR_OFF;

        if (state == -1) {
                command_print(CMD, "Argument unknown. Please pick one of ON, OFF");
                return ERROR_FAIL;
        }
        xtensa->stepping_isr_mode = state;
        return ERROR_OK;
}

COMMAND_HANDLER(xtensa_cmd_mask_interrupts)
{
        return CALL_COMMAND_HANDLER(xtensa_cmd_mask_interrupts_do,
                target_to_xtensa(get_current_target(CMD_CTX)));
}

COMMAND_HELPER(xtensa_cmd_smpbreak_do, struct target *target)
{
        int res;
        uint32_t val = 0;

        if (CMD_ARGC >= 1) {
                for (unsigned int i = 0; i < CMD_ARGC; i++) {
                        if (!strcasecmp(CMD_ARGV[0], "none")) {
                                val = 0;
                        } else if (!strcasecmp(CMD_ARGV[i], "BreakIn")) {
                                val |= OCDDCR_BREAKINEN;
                        } else if (!strcasecmp(CMD_ARGV[i], "BreakOut")) {
                                val |= OCDDCR_BREAKOUTEN;
                        } else if (!strcasecmp(CMD_ARGV[i], "RunStallIn")) {
                                val |= OCDDCR_RUNSTALLINEN;
                        } else if (!strcasecmp(CMD_ARGV[i], "DebugModeOut")) {
                                val |= OCDDCR_DEBUGMODEOUTEN;
                        } else if (!strcasecmp(CMD_ARGV[i], "BreakInOut")) {
                                val |= OCDDCR_BREAKINEN | OCDDCR_BREAKOUTEN;
                        } else if (!strcasecmp(CMD_ARGV[i], "RunStall")) {
                                val |= OCDDCR_RUNSTALLINEN | OCDDCR_DEBUGMODEOUTEN;
                        } else {
                                command_print(CMD, "Unknown arg %s", CMD_ARGV[i]);
                                command_print(
                                        CMD,
                                        "use either BreakInOut, None or RunStall as arguments, or any combination of BreakIn, BreakOut, RunStallIn and DebugModeOut.");
                                return ERROR_OK;
                        }
                }
                res = xtensa_smpbreak_set(target, val);
                if (res != ERROR_OK)
                        command_print(CMD, "Failed to set smpbreak config %d", res);
        } else {
                struct xtensa *xtensa = target_to_xtensa(target);
                res = xtensa_smpbreak_read(xtensa, &val);
                if (res == ERROR_OK)
                        command_print(CMD, "Current bits set:%s%s%s%s",
                                (val & OCDDCR_BREAKINEN) ? " BreakIn" : "",
                                (val & OCDDCR_BREAKOUTEN) ? " BreakOut" : "",
                                (val & OCDDCR_RUNSTALLINEN) ? " RunStallIn" : "",
                                (val & OCDDCR_DEBUGMODEOUTEN) ? " DebugModeOut" : ""
                                );
                else
                        command_print(CMD, "Failed to get smpbreak config %d", res);
        }
        return res;
}

COMMAND_HANDLER(xtensa_cmd_smpbreak)
{
        return CALL_COMMAND_HANDLER(xtensa_cmd_smpbreak_do,
                get_current_target(CMD_CTX));
}

COMMAND_HELPER(xtensa_cmd_tracestart_do, struct xtensa *xtensa)
{
        struct xtensa_trace_status trace_status;
        struct xtensa_trace_start_config cfg = {
                .stoppc = 0,
                .stopmask = XTENSA_STOPMASK_DISABLED,
                .after = 0,
                .after_is_words = false
        };

        /* Parse arguments */
        for (unsigned int i = 0; i < CMD_ARGC; i++) {
                if ((!strcasecmp(CMD_ARGV[i], "pc")) && CMD_ARGC > i) {
                        char *e;
                        i++;
                        cfg.stoppc = strtol(CMD_ARGV[i], &e, 0);
                        cfg.stopmask = 0;
                        if (*e == '/')
                                cfg.stopmask = strtol(e, NULL, 0);
                } else if ((!strcasecmp(CMD_ARGV[i], "after")) && CMD_ARGC > i) {
                        i++;
                        cfg.after = strtol(CMD_ARGV[i], NULL, 0);
                } else if (!strcasecmp(CMD_ARGV[i], "ins")) {
                        cfg.after_is_words = 0;
                } else if (!strcasecmp(CMD_ARGV[i], "words")) {
                        cfg.after_is_words = 1;
                } else {
                        command_print(CMD, "Did not understand %s", CMD_ARGV[i]);
                        return ERROR_FAIL;
                }
        }

        int res = xtensa_dm_trace_status_read(&xtensa->dbg_mod, &trace_status);
        if (res != ERROR_OK)
                return res;
        if (trace_status.stat & TRAXSTAT_TRACT) {
                LOG_WARNING("Silently stop active tracing!");
                res = xtensa_dm_trace_stop(&xtensa->dbg_mod, false);
                if (res != ERROR_OK)
                        return res;
        }

        res = xtensa_dm_trace_start(&xtensa->dbg_mod, &cfg);
        if (res != ERROR_OK)
                return res;

        xtensa->trace_active = true;
        command_print(CMD, "Trace started.");
        return ERROR_OK;
}

COMMAND_HANDLER(xtensa_cmd_tracestart)
{
        return CALL_COMMAND_HANDLER(xtensa_cmd_tracestart_do,
                target_to_xtensa(get_current_target(CMD_CTX)));
}

COMMAND_HELPER(xtensa_cmd_tracestop_do, struct xtensa *xtensa)
{
        struct xtensa_trace_status trace_status;

        int res = xtensa_dm_trace_status_read(&xtensa->dbg_mod, &trace_status);
        if (res != ERROR_OK)
                return res;

        if (!(trace_status.stat & TRAXSTAT_TRACT)) {
                command_print(CMD, "No trace is currently active.");
                return ERROR_FAIL;
        }

        res = xtensa_dm_trace_stop(&xtensa->dbg_mod, true);
        if (res != ERROR_OK)
                return res;

        xtensa->trace_active = false;
        command_print(CMD, "Trace stop triggered.");
        return ERROR_OK;
}

COMMAND_HANDLER(xtensa_cmd_tracestop)
{
        return CALL_COMMAND_HANDLER(xtensa_cmd_tracestop_do,
                target_to_xtensa(get_current_target(CMD_CTX)));
}

COMMAND_HELPER(xtensa_cmd_tracedump_do, struct xtensa *xtensa, const char *fname)
{
        struct xtensa_trace_config trace_config;
        struct xtensa_trace_status trace_status;
        uint32_t memsz, wmem;

        int res = xtensa_dm_trace_status_read(&xtensa->dbg_mod, &trace_status);
        if (res != ERROR_OK)
                return res;

        if (trace_status.stat & TRAXSTAT_TRACT) {
                command_print(CMD, "Tracing is still active. Please stop it first.");
                return ERROR_FAIL;
        }

        res = xtensa_dm_trace_config_read(&xtensa->dbg_mod, &trace_config);
        if (res != ERROR_OK)
                return res;

        if (!(trace_config.ctrl & TRAXCTRL_TREN)) {
                command_print(CMD, "No active trace found; nothing to dump.");
                return ERROR_FAIL;
        }

        memsz = trace_config.memaddr_end - trace_config.memaddr_start + 1;
        LOG_INFO("Total trace memory: %d words", memsz);
        if ((trace_config.addr &
                        ((TRAXADDR_TWRAP_MASK << TRAXADDR_TWRAP_SHIFT) | TRAXADDR_TWSAT)) == 0) {
                /*Memory hasn't overwritten itself yet. */
                wmem = trace_config.addr & TRAXADDR_TADDR_MASK;
                LOG_INFO("...but trace is only %d words", wmem);
                if (wmem < memsz)
                        memsz = wmem;
        } else {
                if (trace_config.addr & TRAXADDR_TWSAT) {
                        LOG_INFO("Real trace is many times longer than that (overflow)");
                } else {
                        uint32_t trc_sz = (trace_config.addr >> TRAXADDR_TWRAP_SHIFT) & TRAXADDR_TWRAP_MASK;
                        trc_sz = (trc_sz * memsz) + (trace_config.addr & TRAXADDR_TADDR_MASK);
                        LOG_INFO("Real trace is %d words, but the start has been truncated.", trc_sz);
                }
        }

        uint8_t *tracemem = malloc(memsz * 4);
        if (!tracemem) {
                command_print(CMD, "Failed to alloc memory for trace data!");
                return ERROR_FAIL;
        }
        res = xtensa_dm_trace_data_read(&xtensa->dbg_mod, tracemem, memsz * 4);
        if (res != ERROR_OK) {
                free(tracemem);
                return res;
        }

        int f = open(fname, O_WRONLY | O_CREAT | O_TRUNC, 0666);
        if (f <= 0) {
                free(tracemem);
                command_print(CMD, "Unable to open file %s", fname);
                return ERROR_FAIL;
        }
        if (write(f, tracemem, memsz * 4) != (int)memsz * 4)
                command_print(CMD, "Unable to write to file %s", fname);
        else
                command_print(CMD, "Written %d bytes of trace data to %s", memsz * 4, fname);
        close(f);

        bool is_all_zeroes = true;
        for (unsigned int i = 0; i < memsz * 4; i++) {
                if (tracemem[i] != 0) {
                        is_all_zeroes = false;
                        break;
                }
        }
        free(tracemem);
        if (is_all_zeroes)
                command_print(
                        CMD,
                        "WARNING: File written is all zeroes. Are you sure you enabled trace memory?");

        return ERROR_OK;
}

COMMAND_HANDLER(xtensa_cmd_tracedump)
{
        if (CMD_ARGC != 1) {
                command_print(CMD, "Command takes exactly 1 parameter.Need filename to dump to as output!");
                return ERROR_FAIL;
        }

        return CALL_COMMAND_HANDLER(xtensa_cmd_tracedump_do,
                target_to_xtensa(get_current_target(CMD_CTX)), CMD_ARGV[0]);
}

static const struct command_registration xtensa_any_command_handlers[] = {
        {
                .name = "xtdef",
                .handler = xtensa_cmd_xtdef,
                .mode = COMMAND_CONFIG,
                .help = "Configure Xtensa core type",
                .usage = "<type>",
        },
        {
                .name = "xtopt",
                .handler = xtensa_cmd_xtopt,
                .mode = COMMAND_CONFIG,
                .help = "Configure Xtensa core option",
                .usage = "<name> <value>",
        },
        {
                .name = "xtmem",
                .handler = xtensa_cmd_xtmem,
                .mode = COMMAND_CONFIG,
                .help = "Configure Xtensa memory/cache option",
                .usage = "<type> [parameters]",
        },
        {
                .name = "xtmmu",
                .handler = xtensa_cmd_xtmmu,
                .mode = COMMAND_CONFIG,
                .help = "Configure Xtensa MMU option",
                .usage = "<NIREFILLENTRIES> <NDREFILLENTRIES> <IVARWAY56> <DVARWAY56>",
        },
        {
                .name = "xtmpu",
                .handler = xtensa_cmd_xtmpu,
                .mode = COMMAND_CONFIG,
                .help = "Configure Xtensa MPU option",
                .usage = "<num FG seg> <min seg size> <lockable> <executeonly>",
        },
        {
                .name = "xtreg",
                .handler = xtensa_cmd_xtreg,
                .mode = COMMAND_CONFIG,
                .help = "Configure Xtensa register",
                .usage = "<regname> <regnum>",
        },
        {
                .name = "xtregs",
                .handler = xtensa_cmd_xtreg,
                .mode = COMMAND_CONFIG,
                .help = "Configure number of Xtensa registers",
                .usage = "<numregs>",
        },
        {
                .name = "xtregfmt",
                .handler = xtensa_cmd_xtregfmt,
                .mode = COMMAND_CONFIG,
                .help = "Configure format of Xtensa register map",
                .usage = "<contiguous|sparse> [numgregs]",
        },
        {
                .name = "set_permissive",
                .handler = xtensa_cmd_permissive_mode,
                .mode = COMMAND_ANY,
                .help = "When set to 1, enable Xtensa permissive mode (fewer client-side checks)",
                .usage = "[0|1]",
        },
        {
                .name = "maskisr",
                .handler = xtensa_cmd_mask_interrupts,
                .mode = COMMAND_ANY,
                .help = "mask Xtensa interrupts at step",
                .usage = "['on'|'off']",
        },
        {
                .name = "smpbreak",
                .handler = xtensa_cmd_smpbreak,
                .mode = COMMAND_ANY,
                .help = "Set the way the CPU chains OCD breaks",
                .usage = "[none|breakinout|runstall] | [BreakIn] [BreakOut] [RunStallIn] [DebugModeOut]",
        },
        {
                .name = "perfmon_enable",
                .handler = xtensa_cmd_perfmon_enable,
                .mode = COMMAND_EXEC,
                .help = "Enable and start performance counter",
                .usage = "<counter_id> <select> [mask] [kernelcnt] [tracelevel]",
        },
        {
                .name = "perfmon_dump",
                .handler = xtensa_cmd_perfmon_dump,
                .mode = COMMAND_EXEC,
                .help = "Dump performance counter value. If no argument specified, dumps all counters.",
                .usage = "[counter_id]",
        },
        {
                .name = "tracestart",
                .handler = xtensa_cmd_tracestart,
                .mode = COMMAND_EXEC,
                .help =
                        "Tracing: Set up and start a trace. Optionally set stop trigger address and amount of data captured after.",
                .usage = "[pc <pcval>/[maskbitcount]] [after <n> [ins|words]]",
        },
        {
                .name = "tracestop",
                .handler = xtensa_cmd_tracestop,
                .mode = COMMAND_EXEC,
                .help = "Tracing: Stop current trace as started by the tracestart command",
                .usage = "",
        },
        {
                .name = "tracedump",
                .handler = xtensa_cmd_tracedump,
                .mode = COMMAND_EXEC,
                .help = "Tracing: Dump trace memory to a files. One file per core.",
                .usage = "<outfile>",
        },
        {
                .name = "exe",
                .handler = xtensa_cmd_exe,
                .mode = COMMAND_ANY,
                .help = "Xtensa stub execution",
                .usage = "<ascii-encoded hexadecimal instruction bytes>",
        },
        COMMAND_REGISTRATION_DONE
};

const struct command_registration xtensa_command_handlers[] = {
        {
                .name = "xtensa",
                .mode = COMMAND_ANY,
                .help = "Xtensa command group",
                .usage = "",
                .chain = xtensa_any_command_handlers,
        },
        COMMAND_REGISTRATION_DONE
};