src/target/arm.h

   1 /*
   2  * Copyright (C) 2005 by Dominic Rath
   3  * Dominic.Rath@gmx.de
   4  *
   5  * Copyright (C) 2008 by Spencer Oliver
   6  * spen@spen-soft.co.uk
   7  *
   8  * Copyright (C) 2009 by Øyvind Harboe
   9  * oyvind.harboe@zylin.com
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the
  23  * Free Software Foundation, Inc.,
  24  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  25  */
  26
  27 #ifndef ARM_H
  28 #define ARM_H
  29
  30 #include <helper/command.h>
  31 #include "target.h"
  32
  33
  34 /**
  35  * @file
  36  * Holds the interface to ARM cores.
  37  *
  38  * At this writing, only "classic ARM" cores built on the ARMv4 register
  39  * and mode model are supported.  The Thumb2-only microcontroller profile
  40  * support has not yet been integrated, affecting Cortex-M parts.
  41  */
  42
  43 /**
  44  * Represent state of an ARM core.
  45  *
  46  * Most numbers match the five low bits of the *PSR registers on
  47  * "classic ARM" processors, which build on the ARMv4 processor
  48  * modes and register set.
  49  *
  50  * ARM_MODE_ANY is a magic value, often used as a wildcard.
  51  *
  52  * Only the microcontroller cores (ARMv6-M, ARMv7-M) support ARM_MODE_THREAD,
  53  * ARM_MODE_USER_THREAD, and ARM_MODE_HANDLER.  Those are the only modes
  54  * they support.
  55  */
  56 enum arm_mode {
  57         ARM_MODE_USR = 16,
  58         ARM_MODE_FIQ = 17,
  59         ARM_MODE_IRQ = 18,
  60         ARM_MODE_SVC = 19,
  61         ARM_MODE_ABT = 23,
  62         ARM_MODE_MON = 26,
  63         ARM_MODE_UND = 27,
  64         ARM_MODE_SYS = 31,
  65
  66         ARM_MODE_THREAD,
  67         ARM_MODE_USER_THREAD,
  68         ARM_MODE_HANDLER,
  69
  70         ARM_MODE_ANY = -1
  71 };
  72
  73 const char *arm_mode_name(unsigned psr_mode);
  74 bool is_arm_mode(unsigned psr_mode);
  75
  76 /** The PSR "T" and "J" bits define the mode of "classic ARM" cores. */
  77 enum arm_state {
  78         ARM_STATE_ARM,
  79         ARM_STATE_THUMB,
  80         ARM_STATE_JAZELLE,
  81         ARM_STATE_THUMB_EE,
  82 };
  83
  84 #define ARM_COMMON_MAGIC 0x0A450A45
  85
  86 /**
  87  * Represents a generic ARM core, with standard application registers.
  88  *
  89  * There are sixteen application registers (including PC, SP, LR) and a PSR.
  90  * Cortex-M series cores do not support as many core states or shadowed
  91  * registers as traditional ARM cores, and only support Thumb2 instructions.
  92  */
  93 struct arm {
  94         int common_magic;
  95         struct reg_cache *core_cache;
  96
  97         /** Handle to the PC; valid in all core modes. */
  98         struct reg *pc;
  99
 100         /** Handle to the CPSR; valid in all core modes. */
 101         struct reg *cpsr;
 102
 103         /** Handle to the SPSR; valid only in core modes with an SPSR. */
 104         struct reg *spsr;
 105
 106         /** Support for arm_reg_current() */
 107         const int *map;
 108
 109         /**
 110          * Indicates what registers are in the ARM state core register set.
 111          * ARM_MODE_ANY indicates the standard set of 37 registers,
 112          * seen on for example ARM7TDMI cores.  ARM_MODE_MON indicates three
 113          * more registers are shadowed, for "Secure Monitor" mode.
 114          * ARM_MODE_THREAD indicates a microcontroller profile core,
 115          * which only shadows SP.
 116          */
 117         enum arm_mode core_type;
 118
 119         /** Record the current core mode: SVC, USR, or some other mode. */
 120         enum arm_mode core_mode;
 121
 122         /** Record the current core state: ARM, Thumb, or otherwise. */
 123         enum arm_state core_state;
 124
 125         /** Flag reporting unavailability of the BKPT instruction. */
 126         bool is_armv4;
 127
 128         /** Flag reporting armv6m based core. */
 129         bool is_armv6m;
 130
 131         /** Flag reporting whether semihosting is active. */
 132         bool is_semihosting;
 133
 134         /** Value to be returned by semihosting SYS_ERRNO request. */
 135         int semihosting_errno;
 136
 137         int (*setup_semihosting)(struct target *target, int enable);
 138
 139         /** Backpointer to the target. */
 140         struct target *target;
 141
 142         /** Handle for the debug module, if one is present. */
 143         struct arm_dpm *dpm;
 144
 145         /** Handle for the Embedded Trace Module, if one is present. */
 146         struct etm_context *etm;
 147
 148         /* FIXME all these methods should take "struct arm *" not target */
 149
 150         /** Retrieve all core registers, for display. */
 151         int (*full_context)(struct target *target);
 152
 153         /** Retrieve a single core register. */
 154         int (*read_core_reg)(struct target *target, struct reg *reg,
 155                         int num, enum arm_mode mode);
 156         int (*write_core_reg)(struct target *target, struct reg *reg,
 157                         int num, enum arm_mode mode, uint32_t value);
 158
 159         /** Read coprocessor register.  */
 160         int (*mrc)(struct target *target, int cpnum,
 161                         uint32_t op1, uint32_t op2,
 162                         uint32_t CRn, uint32_t CRm,
 163                         uint32_t *value);
 164
 165         /** Write coprocessor register.  */
 166         int (*mcr)(struct target *target, int cpnum,
 167                         uint32_t op1, uint32_t op2,
 168                         uint32_t CRn, uint32_t CRm,
 169                         uint32_t value);
 170
 171         void *arch_info;
 172
 173         /** For targets conforming to ARM Debug Interface v5,
 174          * this handle references the Debug Access Port (DAP)
 175          * used to make requests to the target.
 176          */
 177         struct adiv5_dap *dap;
 178 };
 179
 180 /** Convert target handle to generic ARM target state handle. */
 181 static inline struct arm *target_to_arm(struct target *target)
 182 {
 183         assert(target != NULL);
 184         return target->arch_info;
 185 }
 186
 187 static inline bool is_arm(struct arm *arm)
 188 {
 189         assert(arm != NULL);
 190         return arm->common_magic == ARM_COMMON_MAGIC;
 191 }
 192
 193 struct arm_algorithm {
 194         int common_magic;
 195
 196         enum arm_mode core_mode;
 197         enum arm_state core_state;
 198 };
 199
 200 struct arm_reg {
 201         int num;
 202         enum arm_mode mode;
 203         struct target *target;
 204         struct arm *arm;
 205         uint32_t value;
 206 };
 207
 208 struct reg_cache *arm_build_reg_cache(struct target *target, struct arm *arm);
 209
 210 extern const struct command_registration arm_command_handlers[];
 211
 212 int arm_arch_state(struct target *target);
 213 int arm_get_gdb_reg_list(struct target *target,
 214                 struct reg **reg_list[], int *reg_list_size);
 215
 216 int arm_init_arch_info(struct target *target, struct arm *arm);
 217
 218 /* REVISIT rename this once it's usable by ARMv7-M */
 219 int armv4_5_run_algorithm(struct target *target,
 220                 int num_mem_params, struct mem_param *mem_params,
 221                 int num_reg_params, struct reg_param *reg_params,
 222                 uint32_t entry_point, uint32_t exit_point,
 223                 int timeout_ms, void *arch_info);
 224 int armv4_5_run_algorithm_inner(struct target *target,
 225                 int num_mem_params, struct mem_param *mem_params,
 226                 int num_reg_params, struct reg_param *reg_params,
 227                 uint32_t entry_point, uint32_t exit_point,
 228                 int timeout_ms, void *arch_info,
 229                 int (*run_it)(struct target *target, uint32_t exit_point,
 230                                 int timeout_ms, void *arch_info));
 231
 232 int arm_checksum_memory(struct target *target,
 233                 uint32_t address, uint32_t count, uint32_t *checksum);
 234 int arm_blank_check_memory(struct target *target,
 235                 uint32_t address, uint32_t count, uint32_t *blank);
 236
 237 void arm_set_cpsr(struct arm *arm, uint32_t cpsr);
 238 struct reg *arm_reg_current(struct arm *arm, unsigned regnum);
 239
 240 extern struct reg arm_gdb_dummy_fp_reg;
 241 extern struct reg arm_gdb_dummy_fps_reg;
 242
 243 #endif /* ARM_H */