From ef263a45a272366836da10b7c42c916d43527f86 Mon Sep 17 00:00:00 2001 From: Matthias Welwarsky Date: Thu, 22 Sep 2016 21:16:31 +0200 Subject: [PATCH] aarch64: refactor armv8 dpm Move all DPM related functions from aarch64.c to armv8_dpm.c. Change-Id: I43404ff5db414ae898787a523d3219e5bee44889 Signed-off-by: Matthias Welwarsky --- src/target/aarch64.c | 523 +---------------------------------------- src/target/armv8_dpm.c | 427 +++++++++++++++++++++++++++++++++ 2 files changed, 440 insertions(+), 510 deletions(-) diff --git a/src/target/aarch64.c b/src/target/aarch64.c index 824a042de9..1d2abc7027 100644 --- a/src/target/aarch64.c +++ b/src/target/aarch64.c @@ -46,8 +46,6 @@ static int aarch64_virt2phys(struct target *target, target_addr_t virt, target_addr_t *phys); static int aarch64_read_apb_ap_memory(struct target *target, uint64_t address, uint32_t size, uint32_t count, uint8_t *buffer); -static int aarch64_instr_write_data_r0(struct arm_dpm *dpm, - uint32_t opcode, uint32_t data); static int aarch64_restore_system_control_reg(struct target *target) { @@ -253,61 +251,6 @@ static int aarch64_init_debug_access(struct target *target) return aarch64_poll(target); } -/* To reduce needless round-trips, pass in a pointer to the current - * DSCR value. Initialize it to zero if you just need to know the - * value on return from this function; or DSCR_ITE if you - * happen to know that no instruction is pending. - */ -static int aarch64_exec_opcode(struct target *target, - uint32_t opcode, uint32_t *dscr_p) -{ - uint32_t dscr; - int retval; - struct armv8_common *armv8 = target_to_armv8(target); - dscr = dscr_p ? *dscr_p : 0; - - LOG_DEBUG("exec opcode 0x%08" PRIx32, opcode); - - /* Wait for InstrCompl bit to be set */ - long long then = timeval_ms(); - while ((dscr & DSCR_ITE) == 0) { - retval = mem_ap_read_atomic_u32(armv8->debug_ap, - armv8->debug_base + CPUV8_DBG_DSCR, &dscr); - if (retval != ERROR_OK) { - LOG_ERROR("Could not read DSCR register, opcode = 0x%08" PRIx32, opcode); - return retval; - } - if (timeval_ms() > then + 1000) { - LOG_ERROR("Timeout waiting for aarch64_exec_opcode"); - return ERROR_FAIL; - } - } - - retval = mem_ap_write_u32(armv8->debug_ap, - armv8->debug_base + CPUV8_DBG_ITR, opcode); - if (retval != ERROR_OK) - return retval; - - then = timeval_ms(); - do { - retval = mem_ap_read_atomic_u32(armv8->debug_ap, - armv8->debug_base + CPUV8_DBG_DSCR, &dscr); - if (retval != ERROR_OK) { - LOG_ERROR("Could not read DSCR register"); - return retval; - } - if (timeval_ms() > then + 1000) { - LOG_ERROR("Timeout waiting for aarch64_exec_opcode"); - return ERROR_FAIL; - } - } while ((dscr & DSCR_ITE) == 0); /* Wait for InstrCompl bit to be set */ - - if (dscr_p) - *dscr_p = dscr; - - return retval; -} - /* Write to memory mapped registers directly with no cache or mmu handling */ static int aarch64_dap_write_memap_register_u32(struct target *target, uint32_t address, @@ -321,425 +264,6 @@ static int aarch64_dap_write_memap_register_u32(struct target *target, return retval; } -/* - * AARCH64 implementation of Debug Programmer's Model - * - * NOTE the invariant: these routines return with DSCR_ITE set, - * so there's no need to poll for it before executing an instruction. - * - * NOTE that in several of these cases the "stall" mode might be useful. - * It'd let us queue a few operations together... prepare/finish might - * be the places to enable/disable that mode. - */ - -static inline struct aarch64_common *dpm_to_a8(struct arm_dpm *dpm) -{ - return container_of(dpm, struct aarch64_common, armv8_common.dpm); -} - -static int aarch64_write_dcc(struct armv8_common *armv8, uint32_t data) -{ - LOG_DEBUG("write DCC 0x%08" PRIx32, data); - return mem_ap_write_u32(armv8->debug_ap, - armv8->debug_base + CPUV8_DBG_DTRRX, data); -} - -static int aarch64_write_dcc_64(struct armv8_common *armv8, uint64_t data) -{ - int ret; - LOG_DEBUG("write DCC Low word0x%08" PRIx32, (unsigned)data); - LOG_DEBUG("write DCC High word 0x%08" PRIx32, (unsigned)(data >> 32)); - ret = mem_ap_write_u32(armv8->debug_ap, - armv8->debug_base + CPUV8_DBG_DTRRX, data); - ret += mem_ap_write_u32(armv8->debug_ap, - armv8->debug_base + CPUV8_DBG_DTRTX, data >> 32); - return ret; -} - -static int aarch64_read_dcc(struct armv8_common *armv8, uint32_t *data, - uint32_t *dscr_p) -{ - uint32_t dscr = DSCR_ITE; - int retval; - - if (dscr_p) - dscr = *dscr_p; - - /* Wait for DTRRXfull */ - long long then = timeval_ms(); - while ((dscr & DSCR_DTR_TX_FULL) == 0) { - retval = mem_ap_read_atomic_u32(armv8->debug_ap, - armv8->debug_base + CPUV8_DBG_DSCR, - &dscr); - if (retval != ERROR_OK) - return retval; - if (timeval_ms() > then + 1000) { - LOG_ERROR("Timeout waiting for read dcc"); - return ERROR_FAIL; - } - } - - retval = mem_ap_read_atomic_u32(armv8->debug_ap, - armv8->debug_base + CPUV8_DBG_DTRTX, - data); - if (retval != ERROR_OK) - return retval; - LOG_DEBUG("read DCC 0x%08" PRIx32, *data); - - if (dscr_p) - *dscr_p = dscr; - - return retval; -} - -static int aarch64_read_dcc_64(struct armv8_common *armv8, uint64_t *data, - uint32_t *dscr_p) -{ - uint32_t dscr = DSCR_ITE; - uint32_t higher; - int retval; - - if (dscr_p) - dscr = *dscr_p; - - /* Wait for DTRRXfull */ - long long then = timeval_ms(); - while ((dscr & DSCR_DTR_TX_FULL) == 0) { - retval = mem_ap_read_atomic_u32(armv8->debug_ap, - armv8->debug_base + CPUV8_DBG_DSCR, - &dscr); - if (retval != ERROR_OK) - return retval; - if (timeval_ms() > then + 1000) { - LOG_ERROR("Timeout waiting for read dcc"); - return ERROR_FAIL; - } - } - - retval = mem_ap_read_atomic_u32(armv8->debug_ap, - armv8->debug_base + CPUV8_DBG_DTRTX, - (uint32_t *)data); - if (retval != ERROR_OK) - return retval; - - retval = mem_ap_read_atomic_u32(armv8->debug_ap, - armv8->debug_base + CPUV8_DBG_DTRRX, - &higher); - if (retval != ERROR_OK) - return retval; - - *data = *(uint32_t *)data | (uint64_t)higher << 32; - LOG_DEBUG("read DCC 0x%16.16" PRIx64, *data); - - if (dscr_p) - *dscr_p = dscr; - - return retval; -} - -static int aarch64_dpm_prepare(struct arm_dpm *dpm) -{ - struct aarch64_common *a8 = dpm_to_a8(dpm); - uint32_t dscr; - int retval; - - /* set up invariant: INSTR_COMP is set after ever DPM operation */ - long long then = timeval_ms(); - for (;; ) { - retval = mem_ap_read_atomic_u32(a8->armv8_common.debug_ap, - a8->armv8_common.debug_base + CPUV8_DBG_DSCR, - &dscr); - if (retval != ERROR_OK) - return retval; - if ((dscr & DSCR_ITE) != 0) - break; - if (timeval_ms() > then + 1000) { - LOG_ERROR("Timeout waiting for dpm prepare"); - return ERROR_FAIL; - } - } - - /* this "should never happen" ... */ - if (dscr & DSCR_DTR_RX_FULL) { - LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr); - /* Clear DCCRX */ - retval = mem_ap_read_u32(a8->armv8_common.debug_ap, - a8->armv8_common.debug_base + CPUV8_DBG_DTRRX, &dscr); - if (retval != ERROR_OK) - return retval; - - /* Clear sticky error */ - retval = mem_ap_write_u32(a8->armv8_common.debug_ap, - a8->armv8_common.debug_base + CPUV8_DBG_DRCR, DRCR_CSE); - if (retval != ERROR_OK) - return retval; - } - - return retval; -} - -static int aarch64_dpm_finish(struct arm_dpm *dpm) -{ - /* REVISIT what could be done here? */ - return ERROR_OK; -} - -static int aarch64_instr_execute(struct arm_dpm *dpm, - uint32_t opcode) -{ - struct aarch64_common *a8 = dpm_to_a8(dpm); - uint32_t dscr = DSCR_ITE; - - return aarch64_exec_opcode( - a8->armv8_common.arm.target, - opcode, - &dscr); -} - -static int aarch64_instr_write_data_dcc(struct arm_dpm *dpm, - uint32_t opcode, uint32_t data) -{ - struct aarch64_common *a8 = dpm_to_a8(dpm); - int retval; - uint32_t dscr = DSCR_ITE; - - retval = aarch64_write_dcc(&a8->armv8_common, data); - if (retval != ERROR_OK) - return retval; - - return aarch64_exec_opcode( - a8->armv8_common.arm.target, - opcode, - &dscr); -} - -static int aarch64_instr_write_data_dcc_64(struct arm_dpm *dpm, - uint32_t opcode, uint64_t data) -{ - struct aarch64_common *a8 = dpm_to_a8(dpm); - int retval; - uint32_t dscr = DSCR_ITE; - - retval = aarch64_write_dcc_64(&a8->armv8_common, data); - if (retval != ERROR_OK) - return retval; - - return aarch64_exec_opcode( - a8->armv8_common.arm.target, - opcode, - &dscr); -} - -static int aarch64_instr_write_data_r0(struct arm_dpm *dpm, - uint32_t opcode, uint32_t data) -{ - struct aarch64_common *a8 = dpm_to_a8(dpm); - - uint32_t dscr = DSCR_ITE; - int retval; - - retval = aarch64_write_dcc(&a8->armv8_common, data); - if (retval != ERROR_OK) - return retval; - - retval = aarch64_exec_opcode( - a8->armv8_common.arm.target, armv8_opcode(&a8->armv8_common, READ_REG_DTRRX), &dscr); - if (retval != ERROR_OK) - return retval; - - /* then the opcode, taking data from R0 */ - retval = aarch64_exec_opcode( - a8->armv8_common.arm.target, - opcode, - &dscr); - - return retval; -} - -static int aarch64_instr_write_data_r0_64(struct arm_dpm *dpm, - uint32_t opcode, uint64_t data) -{ - struct aarch64_common *a8 = dpm_to_a8(dpm); - uint32_t dscr = DSCR_ITE; - int retval; - - retval = aarch64_write_dcc_64(&a8->armv8_common, data); - if (retval != ERROR_OK) - return retval; - - retval = aarch64_exec_opcode( - a8->armv8_common.arm.target, - ARMV8_MRS(SYSTEM_DBG_DBGDTR_EL0, 0), - &dscr); - if (retval != ERROR_OK) - return retval; - - /* then the opcode, taking data from R0 */ - retval = aarch64_exec_opcode( - a8->armv8_common.arm.target, - opcode, - &dscr); - - return retval; -} - -static int aarch64_instr_cpsr_sync(struct arm_dpm *dpm) -{ - struct target *target = dpm->arm->target; - struct armv8_common *armv8 = target_to_armv8(target); - uint32_t dscr = DSCR_ITE; - - /* "Prefetch flush" after modifying execution status in CPSR */ - return aarch64_exec_opcode(target, armv8_opcode(armv8, ARMV8_OPC_DSB_SY), &dscr); -} - -static int aarch64_instr_read_data_dcc(struct arm_dpm *dpm, - uint32_t opcode, uint32_t *data) -{ - struct aarch64_common *a8 = dpm_to_a8(dpm); - int retval; - uint32_t dscr = DSCR_ITE; - - /* the opcode, writing data to DCC */ - retval = aarch64_exec_opcode( - a8->armv8_common.arm.target, - opcode, - &dscr); - if (retval != ERROR_OK) - return retval; - - return aarch64_read_dcc(&a8->armv8_common, data, &dscr); -} - -static int aarch64_instr_read_data_dcc_64(struct arm_dpm *dpm, - uint32_t opcode, uint64_t *data) -{ - struct aarch64_common *a8 = dpm_to_a8(dpm); - int retval; - uint32_t dscr = DSCR_ITE; - - /* the opcode, writing data to DCC */ - retval = aarch64_exec_opcode( - a8->armv8_common.arm.target, - opcode, - &dscr); - if (retval != ERROR_OK) - return retval; - - return aarch64_read_dcc_64(&a8->armv8_common, data, &dscr); -} - -static int aarch64_instr_read_data_r0(struct arm_dpm *dpm, - uint32_t opcode, uint32_t *data) -{ - struct aarch64_common *a8 = dpm_to_a8(dpm); - uint32_t dscr = DSCR_ITE; - int retval; - - /* the opcode, writing data to R0 */ - retval = aarch64_exec_opcode( - a8->armv8_common.arm.target, - opcode, - &dscr); - if (retval != ERROR_OK) - return retval; - - /* write R0 to DCC */ - retval = aarch64_exec_opcode( - a8->armv8_common.arm.target, armv8_opcode(&a8->armv8_common, WRITE_REG_DTRTX), &dscr); - if (retval != ERROR_OK) - return retval; - - return aarch64_read_dcc(&a8->armv8_common, data, &dscr); -} - -static int aarch64_instr_read_data_r0_64(struct arm_dpm *dpm, - uint32_t opcode, uint64_t *data) -{ - struct aarch64_common *a8 = dpm_to_a8(dpm); - uint32_t dscr = DSCR_ITE; - int retval; - - /* the opcode, writing data to R0 */ - retval = aarch64_exec_opcode( - a8->armv8_common.arm.target, - opcode, - &dscr); - if (retval != ERROR_OK) - return retval; - - /* write R0 to DCC */ - retval = aarch64_exec_opcode( - a8->armv8_common.arm.target, - ARMV8_MSR_GP(SYSTEM_DBG_DBGDTR_EL0, 0), /* msr dbgdtr_el0, x0 */ - &dscr); - if (retval != ERROR_OK) - return retval; - - return aarch64_read_dcc_64(&a8->armv8_common, data, &dscr); -} - -static int aarch64_bpwp_enable(struct arm_dpm *dpm, unsigned index_t, - uint32_t addr, uint32_t control) -{ - struct aarch64_common *a8 = dpm_to_a8(dpm); - uint32_t vr = a8->armv8_common.debug_base; - uint32_t cr = a8->armv8_common.debug_base; - int retval; - - switch (index_t) { - case 0 ... 15: /* breakpoints */ - vr += CPUV8_DBG_BVR_BASE; - cr += CPUV8_DBG_BCR_BASE; - break; - case 16 ... 31: /* watchpoints */ - vr += CPUV8_DBG_WVR_BASE; - cr += CPUV8_DBG_WCR_BASE; - index_t -= 16; - break; - default: - return ERROR_FAIL; - } - vr += 16 * index_t; - cr += 16 * index_t; - - LOG_DEBUG("A8: bpwp enable, vr %08x cr %08x", - (unsigned) vr, (unsigned) cr); - - retval = aarch64_dap_write_memap_register_u32(dpm->arm->target, - vr, addr); - if (retval != ERROR_OK) - return retval; - retval = aarch64_dap_write_memap_register_u32(dpm->arm->target, - cr, control); - return retval; -} - -static int aarch64_bpwp_disable(struct arm_dpm *dpm, unsigned index_t) -{ - struct aarch64_common *a = dpm_to_a8(dpm); - uint32_t cr; - - switch (index_t) { - case 0 ... 15: - cr = a->armv8_common.debug_base + CPUV8_DBG_BCR_BASE; - break; - case 16 ... 31: - cr = a->armv8_common.debug_base + CPUV8_DBG_WCR_BASE; - index_t -= 16; - break; - default: - return ERROR_FAIL; - } - cr += 16 * index_t; - - LOG_DEBUG("A: bpwp disable, cr %08x", (unsigned) cr); - - /* clear control register */ - return aarch64_dap_write_memap_register_u32(dpm->arm->target, cr, 0); - -} - static int aarch64_dpm_setup(struct aarch64_common *a8, uint64_t debug) { struct arm_dpm *dpm = &a8->armv8_common.dpm; @@ -748,32 +272,13 @@ static int aarch64_dpm_setup(struct aarch64_common *a8, uint64_t debug) dpm->arm = &a8->armv8_common.arm; dpm->didr = debug; - dpm->prepare = aarch64_dpm_prepare; - dpm->finish = aarch64_dpm_finish; - - dpm->instr_execute = aarch64_instr_execute; - dpm->instr_write_data_dcc = aarch64_instr_write_data_dcc; - dpm->instr_write_data_dcc_64 = aarch64_instr_write_data_dcc_64; - dpm->instr_write_data_r0 = aarch64_instr_write_data_r0; - dpm->instr_write_data_r0_64 = aarch64_instr_write_data_r0_64; - dpm->instr_cpsr_sync = aarch64_instr_cpsr_sync; - - dpm->instr_read_data_dcc = aarch64_instr_read_data_dcc; - dpm->instr_read_data_dcc_64 = aarch64_instr_read_data_dcc_64; - dpm->instr_read_data_r0 = aarch64_instr_read_data_r0; - dpm->instr_read_data_r0_64 = aarch64_instr_read_data_r0_64; - - dpm->arm_reg_current = armv8_reg_current; - - dpm->bpwp_enable = aarch64_bpwp_enable; - dpm->bpwp_disable = aarch64_bpwp_disable; - retval = armv8_dpm_setup(dpm); if (retval == ERROR_OK) retval = armv8_dpm_initialize(dpm); return retval; } + static struct target *get_aarch64(struct target *target, int32_t coreid) { struct target_list *head; @@ -1853,6 +1358,7 @@ static int aarch64_write_apb_ap_memory(struct target *target, /* write memory through APB-AP */ int retval = ERROR_COMMAND_SYNTAX_ERROR; struct armv8_common *armv8 = target_to_armv8(target); + struct arm_dpm *dpm = &armv8->dpm; struct arm *arm = &armv8->arm; int total_bytes = count * size; int total_u32; @@ -1937,17 +1443,15 @@ static int aarch64_write_apb_ap_memory(struct target *target, if (arm->core_state == ARM_STATE_AARCH64) { /* Write X0 with value 'address' using write procedure */ /* Step 1.a+b - Write the address for read access into DBGDTR_EL0 */ - retval += aarch64_write_dcc_64(armv8, address & ~0x3ULL); /* Step 1.c - Copy value from DTR to R0 using instruction mrs DBGDTR_EL0, x0 */ - retval += aarch64_exec_opcode(target, - ARMV8_MRS(SYSTEM_DBG_DBGDTR_EL0, 0), &dscr); + retval = dpm->instr_write_data_dcc_64(dpm, + ARMV8_MRS(SYSTEM_DBG_DBGDTR_EL0, 0), address & ~0x3ULL); } else { /* Write R0 with value 'address' using write procedure */ /* Step 1.a+b - Write the address for read access into DBGDTRRX */ - retval += aarch64_write_dcc(armv8, address & ~0x3ULL); /* Step 1.c - Copy value from DTR to R0 using instruction mrc DBGDTRTXint, r0 */ - retval += aarch64_exec_opcode(target, - T32_FMTITR(ARMV4_5_MRC(14, 0, 0, 0, 5, 0)), &dscr); + dpm->instr_write_data_dcc(dpm, + T32_FMTITR(ARMV4_5_MRC(14, 0, 0, 0, 5, 0)), address & ~0x3ULL); } /* Step 1.d - Change DCC to memory mode */ @@ -2008,6 +1512,7 @@ static int aarch64_read_apb_ap_memory(struct target *target, /* read memory through APB-AP */ int retval = ERROR_COMMAND_SYNTAX_ERROR; struct armv8_common *armv8 = target_to_armv8(target); + struct arm_dpm *dpm = &armv8->dpm; struct arm *arm = &armv8->arm; int total_bytes = count * size; int total_u32; @@ -2058,11 +1563,11 @@ static int aarch64_read_apb_ap_memory(struct target *target, if (arm->core_state == ARM_STATE_AARCH64) { /* Write X0 with value 'address' using write procedure */ /* Step 1.a+b - Write the address for read access into DBGDTR_EL0 */ - retval += aarch64_write_dcc_64(armv8, address & ~0x3ULL); /* Step 1.c - Copy value from DTR to R0 using instruction mrs DBGDTR_EL0, x0 */ - retval += aarch64_exec_opcode(target, ARMV8_MRS(SYSTEM_DBG_DBGDTR_EL0, 0), &dscr); + retval += dpm->instr_write_data_dcc_64(dpm, + ARMV8_MRS(SYSTEM_DBG_DBGDTR_EL0, 0), address & ~0x3ULL); /* Step 1.d - Dummy operation to ensure EDSCR.Txfull == 1 */ - retval += aarch64_exec_opcode(target, ARMV8_MSR_GP(SYSTEM_DBG_DBGDTR_EL0, 0), &dscr); + retval += dpm->instr_execute(dpm, ARMV8_MSR_GP(SYSTEM_DBG_DBGDTR_EL0, 0)); /* Step 1.e - Change DCC to memory mode */ dscr = dscr | DSCR_MA; retval += mem_ap_write_atomic_u32(armv8->debug_ap, @@ -2073,13 +1578,11 @@ static int aarch64_read_apb_ap_memory(struct target *target, } else { /* Write R0 with value 'address' using write procedure */ /* Step 1.a+b - Write the address for read access into DBGDTRRXint */ - retval += aarch64_write_dcc(armv8, address & ~0x3ULL); /* Step 1.c - Copy value from DTR to R0 using instruction mrc DBGDTRTXint, r0 */ - retval += aarch64_exec_opcode(target, - T32_FMTITR(ARMV4_5_MRC(14, 0, 0, 0, 5, 0)), &dscr); + retval += dpm->instr_write_data_dcc(dpm, + T32_FMTITR(ARMV4_5_MRC(14, 0, 0, 0, 5, 0)), address & ~0x3ULL); /* Step 1.d - Dummy operation to ensure EDSCR.Txfull == 1 */ - retval += aarch64_exec_opcode(target, - T32_FMTITR(ARMV4_5_MCR(14, 0, 0, 0, 5, 0)), &dscr); + retval += dpm->instr_execute(dpm, T32_FMTITR(ARMV4_5_MCR(14, 0, 0, 0, 5, 0))); /* Step 1.e - Change DCC to memory mode */ dscr = dscr | DSCR_MA; retval += mem_ap_write_atomic_u32(armv8->debug_ap, diff --git a/src/target/armv8_dpm.c b/src/target/armv8_dpm.c index c3d5ec4def..4bb20755f3 100644 --- a/src/target/armv8_dpm.c +++ b/src/target/armv8_dpm.c @@ -26,6 +26,8 @@ #include "target_type.h" #include "armv8_opcodes.h" +#include "helper/time_support.h" + /** * @file @@ -42,6 +44,410 @@ /*----------------------------------------------------------------------*/ +static int dpmv8_write_dcc(struct armv8_common *armv8, uint32_t data) +{ + LOG_DEBUG("write DCC 0x%08" PRIx32, data); + return mem_ap_write_u32(armv8->debug_ap, + armv8->debug_base + CPUV8_DBG_DTRRX, data); +} + +static int dpmv8_write_dcc_64(struct armv8_common *armv8, uint64_t data) +{ + int ret; + LOG_DEBUG("write DCC Low word 0x%08" PRIx32, (unsigned)data); + LOG_DEBUG("write DCC High word 0x%08" PRIx32, (unsigned)(data >> 32)); + ret = mem_ap_write_u32(armv8->debug_ap, + armv8->debug_base + CPUV8_DBG_DTRRX, data); + ret += mem_ap_write_u32(armv8->debug_ap, + armv8->debug_base + CPUV8_DBG_DTRTX, data >> 32); + return ret; +} + +static int dpmv8_read_dcc(struct armv8_common *armv8, uint32_t *data, + uint32_t *dscr_p) +{ + uint32_t dscr = DSCR_ITE; + int retval; + + if (dscr_p) + dscr = *dscr_p; + + /* Wait for DTRRXfull */ + long long then = timeval_ms(); + while ((dscr & DSCR_DTR_TX_FULL) == 0) { + retval = mem_ap_read_atomic_u32(armv8->debug_ap, + armv8->debug_base + CPUV8_DBG_DSCR, + &dscr); + if (retval != ERROR_OK) + return retval; + if (timeval_ms() > then + 1000) { + LOG_ERROR("Timeout waiting for read dcc"); + return ERROR_FAIL; + } + } + + retval = mem_ap_read_atomic_u32(armv8->debug_ap, + armv8->debug_base + CPUV8_DBG_DTRTX, + data); + if (retval != ERROR_OK) + return retval; + LOG_DEBUG("read DCC 0x%08" PRIx32, *data); + + if (dscr_p) + *dscr_p = dscr; + + return retval; +} + +static int dpmv8_read_dcc_64(struct armv8_common *armv8, uint64_t *data, + uint32_t *dscr_p) +{ + uint32_t dscr = DSCR_ITE; + uint32_t higher; + int retval; + + if (dscr_p) + dscr = *dscr_p; + + /* Wait for DTRRXfull */ + long long then = timeval_ms(); + while ((dscr & DSCR_DTR_TX_FULL) == 0) { + retval = mem_ap_read_atomic_u32(armv8->debug_ap, + armv8->debug_base + CPUV8_DBG_DSCR, + &dscr); + if (retval != ERROR_OK) + return retval; + if (timeval_ms() > then + 1000) { + LOG_ERROR("Timeout waiting for read dcc"); + return ERROR_FAIL; + } + } + + retval = mem_ap_read_atomic_u32(armv8->debug_ap, + armv8->debug_base + CPUV8_DBG_DTRTX, + (uint32_t *)data); + if (retval != ERROR_OK) + return retval; + + retval = mem_ap_read_atomic_u32(armv8->debug_ap, + armv8->debug_base + CPUV8_DBG_DTRRX, + &higher); + if (retval != ERROR_OK) + return retval; + + *data = *(uint32_t *)data | (uint64_t)higher << 32; + LOG_DEBUG("read DCC 0x%16.16" PRIx64, *data); + + if (dscr_p) + *dscr_p = dscr; + + return retval; +} + +static int dpmv8_dpm_prepare(struct arm_dpm *dpm) +{ + struct armv8_common *armv8 = dpm->arm->arch_info; + uint32_t dscr; + int retval; + + /* set up invariant: INSTR_COMP is set after ever DPM operation */ + long long then = timeval_ms(); + for (;; ) { + retval = mem_ap_read_atomic_u32(armv8->debug_ap, + armv8->debug_base + CPUV8_DBG_DSCR, + &dscr); + if (retval != ERROR_OK) + return retval; + if ((dscr & DSCR_ITE) != 0) + break; + if (timeval_ms() > then + 1000) { + LOG_ERROR("Timeout waiting for dpm prepare"); + return ERROR_FAIL; + } + } + + /* this "should never happen" ... */ + if (dscr & DSCR_DTR_RX_FULL) { + LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr); + /* Clear DCCRX */ + retval = mem_ap_read_u32(armv8->debug_ap, + armv8->debug_base + CPUV8_DBG_DTRRX, &dscr); + if (retval != ERROR_OK) + return retval; + + /* Clear sticky error */ + retval = mem_ap_write_u32(armv8->debug_ap, + armv8->debug_base + CPUV8_DBG_DRCR, DRCR_CSE); + if (retval != ERROR_OK) + return retval; + } + + return retval; +} + +static int dpmv8_dpm_finish(struct arm_dpm *dpm) +{ + /* REVISIT what could be done here? */ + return ERROR_OK; +} + +static int dpmv8_exec_opcode(struct arm_dpm *dpm, + uint32_t opcode, uint32_t *p_dscr) +{ + struct armv8_common *armv8 = dpm->arm->arch_info; + uint32_t dscr = DSCR_ITE; + int retval; + + LOG_DEBUG("exec opcode 0x%08" PRIx32, opcode); + + if (p_dscr) + dscr = *p_dscr; + + /* Wait for InstrCompl bit to be set */ + long long then = timeval_ms(); + while ((dscr & DSCR_ITE) == 0) { + retval = mem_ap_read_atomic_u32(armv8->debug_ap, + armv8->debug_base + CPUV8_DBG_DSCR, &dscr); + if (retval != ERROR_OK) { + LOG_ERROR("Could not read DSCR register, opcode = 0x%08" PRIx32, opcode); + return retval; + } + if (timeval_ms() > then + 1000) { + LOG_ERROR("Timeout waiting for aarch64_exec_opcode"); + return ERROR_FAIL; + } + } + + retval = mem_ap_write_u32(armv8->debug_ap, + armv8->debug_base + CPUV8_DBG_ITR, opcode); + if (retval != ERROR_OK) + return retval; + + then = timeval_ms(); + do { + retval = mem_ap_read_atomic_u32(armv8->debug_ap, + armv8->debug_base + CPUV8_DBG_DSCR, &dscr); + if (retval != ERROR_OK) { + LOG_ERROR("Could not read DSCR register"); + return retval; + } + if (timeval_ms() > then + 1000) { + LOG_ERROR("Timeout waiting for aarch64_exec_opcode"); + return ERROR_FAIL; + } + } while ((dscr & DSCR_ITE) == 0); /* Wait for InstrCompl bit to be set */ + + if (p_dscr) + *p_dscr = dscr; + + return retval; +} + +static int dpmv8_instr_execute(struct arm_dpm *dpm, uint32_t opcode) +{ + return dpmv8_exec_opcode(dpm, opcode, NULL); +} + +static int dpmv8_instr_write_data_dcc(struct arm_dpm *dpm, + uint32_t opcode, uint32_t data) +{ + struct armv8_common *armv8 = dpm->arm->arch_info; + int retval; + + retval = dpmv8_write_dcc(armv8, data); + if (retval != ERROR_OK) + return retval; + + return dpmv8_exec_opcode(dpm, opcode, 0); +} + +static int dpmv8_instr_write_data_dcc_64(struct arm_dpm *dpm, + uint32_t opcode, uint64_t data) +{ + struct armv8_common *armv8 = dpm->arm->arch_info; + int retval; + + retval = dpmv8_write_dcc_64(armv8, data); + if (retval != ERROR_OK) + return retval; + + return dpmv8_exec_opcode(dpm, opcode, 0); +} + +static int dpmv8_instr_write_data_r0(struct arm_dpm *dpm, + uint32_t opcode, uint32_t data) +{ + struct armv8_common *armv8 = dpm->arm->arch_info; + uint32_t dscr = DSCR_ITE; + int retval; + + retval = dpmv8_write_dcc(armv8, data); + if (retval != ERROR_OK) + return retval; + + retval = dpmv8_exec_opcode(dpm, armv8_opcode(armv8, READ_REG_DTRRX), &dscr); + if (retval != ERROR_OK) + return retval; + + /* then the opcode, taking data from R0 */ + return dpmv8_exec_opcode(dpm, opcode, &dscr); +} + +static int dpmv8_instr_write_data_r0_64(struct arm_dpm *dpm, + uint32_t opcode, uint64_t data) +{ + struct armv8_common *armv8 = dpm->arm->arch_info; + uint32_t dscr = DSCR_ITE; + int retval; + + retval = dpmv8_write_dcc_64(armv8, data); + if (retval != ERROR_OK) + return retval; + + retval = dpmv8_exec_opcode(dpm, ARMV8_MRS(SYSTEM_DBG_DBGDTR_EL0, 0), &dscr); + if (retval != ERROR_OK) + return retval; + + /* then the opcode, taking data from R0 */ + return dpmv8_exec_opcode(dpm, opcode, &dscr); +} + +static int dpmv8_instr_cpsr_sync(struct arm_dpm *dpm) +{ + struct armv8_common *armv8 = dpm->arm->arch_info; + /* "Prefetch flush" after modifying execution status in CPSR */ + return dpmv8_exec_opcode(dpm, armv8_opcode(armv8, ARMV8_OPC_DSB_SY), NULL); +} + +static int dpmv8_instr_read_data_dcc(struct arm_dpm *dpm, + uint32_t opcode, uint32_t *data) +{ + struct armv8_common *armv8 = dpm->arm->arch_info; + uint32_t dscr = DSCR_ITE; + int retval; + + /* the opcode, writing data to DCC */ + retval = dpmv8_exec_opcode(dpm, opcode, &dscr); + if (retval != ERROR_OK) + return retval; + + return dpmv8_read_dcc(armv8, data, &dscr); +} + +static int dpmv8_instr_read_data_dcc_64(struct arm_dpm *dpm, + uint32_t opcode, uint64_t *data) +{ + struct armv8_common *armv8 = dpm->arm->arch_info; + uint32_t dscr = DSCR_ITE; + int retval; + + /* the opcode, writing data to DCC */ + retval = dpmv8_exec_opcode(dpm, opcode, &dscr); + if (retval != ERROR_OK) + return retval; + + return dpmv8_read_dcc_64(armv8, data, &dscr); +} + +static int dpmv8_instr_read_data_r0(struct arm_dpm *dpm, + uint32_t opcode, uint32_t *data) +{ + struct armv8_common *armv8 = dpm->arm->arch_info; + uint32_t dscr = DSCR_ITE; + int retval; + + /* the opcode, writing data to R0 */ + retval = dpmv8_exec_opcode(dpm, opcode, &dscr); + if (retval != ERROR_OK) + return retval; + + /* write R0 to DCC */ + retval = dpmv8_exec_opcode(dpm, armv8_opcode(armv8, WRITE_REG_DTRTX), &dscr); + if (retval != ERROR_OK) + return retval; + + return dpmv8_read_dcc(armv8, data, &dscr); +} + +static int dpmv8_instr_read_data_r0_64(struct arm_dpm *dpm, + uint32_t opcode, uint64_t *data) +{ + struct armv8_common *armv8 = dpm->arm->arch_info; + uint32_t dscr = DSCR_ITE; + int retval; + + /* the opcode, writing data to R0 */ + retval = dpmv8_exec_opcode(dpm, opcode, &dscr); + if (retval != ERROR_OK) + return retval; + + /* write R0 to DCC */ + retval = dpmv8_exec_opcode(dpm, ARMV8_MSR_GP(SYSTEM_DBG_DBGDTR_EL0, 0), &dscr); + if (retval != ERROR_OK) + return retval; + + return dpmv8_read_dcc_64(armv8, data, &dscr); +} + +#if 0 +static int dpmv8_bpwp_enable(struct arm_dpm *dpm, unsigned index_t, + target_addr_t addr, uint32_t control) +{ + struct armv8_common *armv8 = dpm->arm->arch_info; + uint32_t vr = armv8->debug_base; + uint32_t cr = armv8->debug_base; + int retval; + + switch (index_t) { + case 0 ... 15: /* breakpoints */ + vr += CPUV8_DBG_BVR_BASE; + cr += CPUV8_DBG_BCR_BASE; + break; + case 16 ... 31: /* watchpoints */ + vr += CPUV8_DBG_WVR_BASE; + cr += CPUV8_DBG_WCR_BASE; + index_t -= 16; + break; + default: + return ERROR_FAIL; + } + vr += 16 * index_t; + cr += 16 * index_t; + + LOG_DEBUG("A8: bpwp enable, vr %08x cr %08x", + (unsigned) vr, (unsigned) cr); + + retval = mem_ap_write_atomic_u32(armv8->debug_ap, vr, addr); + if (retval != ERROR_OK) + return retval; + return mem_ap_write_atomic_u32(armv8->debug_ap, cr, control); +} +#endif + +static int dpmv8_bpwp_disable(struct arm_dpm *dpm, unsigned index_t) +{ + struct armv8_common *armv8 = dpm->arm->arch_info; + uint32_t cr; + + switch (index_t) { + case 0 ... 15: + cr = armv8->debug_base + CPUV8_DBG_BCR_BASE; + break; + case 16 ... 31: + cr = armv8->debug_base + CPUV8_DBG_WCR_BASE; + index_t -= 16; + break; + default: + return ERROR_FAIL; + } + cr += 16 * index_t; + + LOG_DEBUG("A: bpwp disable, cr %08x", (unsigned) cr); + + /* clear control register */ + return mem_ap_write_atomic_u32(armv8->debug_ap, cr, 0); +} + /* * Coprocessor support */ @@ -1061,6 +1467,27 @@ int armv8_dpm_setup(struct arm_dpm *dpm) arm->mcr = dpmv8_mcr; arm->mrs = dpmv8_mrs; arm->msr = dpmv8_msr; + + dpm->prepare = dpmv8_dpm_prepare; + dpm->finish = dpmv8_dpm_finish; + + dpm->instr_execute = dpmv8_instr_execute; + dpm->instr_write_data_dcc = dpmv8_instr_write_data_dcc; + dpm->instr_write_data_dcc_64 = dpmv8_instr_write_data_dcc_64; + dpm->instr_write_data_r0 = dpmv8_instr_write_data_r0; + dpm->instr_write_data_r0_64 = dpmv8_instr_write_data_r0_64; + dpm->instr_cpsr_sync = dpmv8_instr_cpsr_sync; + + dpm->instr_read_data_dcc = dpmv8_instr_read_data_dcc; + dpm->instr_read_data_dcc_64 = dpmv8_instr_read_data_dcc_64; + dpm->instr_read_data_r0 = dpmv8_instr_read_data_r0; + dpm->instr_read_data_r0_64 = dpmv8_instr_read_data_r0_64; + + dpm->arm_reg_current = armv8_reg_current; + +/* dpm->bpwp_enable = dpmv8_bpwp_enable; */ + dpm->bpwp_disable = dpmv8_bpwp_disable; + /* breakpoint setup -- optional until it works everywhere */ if (!target->type->add_breakpoint) { target->type->add_breakpoint = dpmv8_add_breakpoint; -- 2.30.2