diff options
Diffstat (limited to 'src')
-rw-r--r-- | src/target/cortex_a8.c | 146 |
1 files changed, 116 insertions, 30 deletions
diff --git a/src/target/cortex_a8.c b/src/target/cortex_a8.c index d02fee9..01b7aee 100644 --- a/src/target/cortex_a8.c +++ b/src/target/cortex_a8.c @@ -237,7 +237,7 @@ static int cortex_a8_dap_read_coreregister_u32(struct target *target, struct armv7a_common *armv7a = target_to_armv7a(target); struct swjdp_common *swjdp = &armv7a->swjdp_info; - if (reg > 16) + if (reg > 17) return retval; if (reg < 15) @@ -251,10 +251,12 @@ static int cortex_a8_dap_read_coreregister_u32(struct target *target, cortex_a8_exec_opcode(target, 0xE1A0000F); cortex_a8_exec_opcode(target, ARMV4_5_MCR(14, 0, 0, 0, 5, 0)); } - else if (reg == 16) + else { - /* "MRS r0, CPSR"; then move r0 to DCCTX */ - cortex_a8_exec_opcode(target, ARMV4_5_MRS(0, 0)); + /* "MRS r0, CPSR" or "MRS r0, SPSR" + * then move r0 to DCCTX + */ + cortex_a8_exec_opcode(target, ARMV4_5_MRS(0, reg & 1)); cortex_a8_exec_opcode(target, ARMV4_5_MCR(14, 0, 0, 0, 5, 0)); } @@ -268,11 +270,13 @@ static int cortex_a8_dap_read_coreregister_u32(struct target *target, retval = mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DTRTX, value); + LOG_DEBUG("read DCC 0x%08" PRIx32, *value); return retval; } -static int cortex_a8_dap_write_coreregister_u32(struct target *target, uint32_t value, int regnum) +static int cortex_a8_dap_write_coreregister_u32(struct target *target, + uint32_t value, int regnum) { int retval = ERROR_OK; uint8_t Rd = regnum&0xFF; @@ -292,29 +296,39 @@ static int cortex_a8_dap_write_coreregister_u32(struct target *target, uint32_t cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0)); } - if (Rd > 16) + if (Rd > 17) return retval; /* Write to DCCRX */ + LOG_DEBUG("write DCC 0x%08" PRIx32, value); retval = mem_ap_write_u32(swjdp, armv7a->debug_base + CPUDBG_DTRRX, value); if (Rd < 15) { - /* DCCRX to Rd, MCR p14, 0, Rd, c0, c5, 0, 0xEE000E15 */ + /* DCCRX to Rn, "MCR p14, 0, Rn, c0, c5, 0", 0xEE00nE15 */ cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, Rd, 0, 5, 0)); } else if (Rd == 15) { + /* DCCRX to R0, "MCR p14, 0, R0, c0, c5, 0", 0xEE000E15 + * then "mov r15, r0" + */ cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0)); cortex_a8_exec_opcode(target, 0xE1A0F000); } - else if (Rd == 16) + else { + /* DCCRX to R0, "MCR p14, 0, R0, c0, c5, 0", 0xEE000E15 + * then "MSR CPSR_cxsf, r0" or "MSR SPSR_cxsf, r0" (all fields) + */ cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0)); - cortex_a8_exec_opcode(target, ARMV4_5_MSR_GP(0, 0xF, 0)); - /* Execute a PrefetchFlush instruction through the ITR. */ - cortex_a8_exec_opcode(target, ARMV4_5_MCR(15, 0, 0, 7, 5, 4)); + cortex_a8_exec_opcode(target, ARMV4_5_MSR_GP(0, 0xF, Rd & 1)); + + /* "Prefetch flush" after modifying execution status in CPSR */ + if (Rd == 16) + cortex_a8_exec_opcode(target, + ARMV4_5_MCR(15, 0, 0, 7, 5, 4)); } return retval; @@ -950,28 +964,64 @@ static int cortex_a8_store_core_reg_u32(struct target *target, int num, #endif +static int cortex_a8_write_core_reg(struct target *target, int num, + enum armv4_5_mode mode, uint32_t value); + static int cortex_a8_read_core_reg(struct target *target, int num, enum armv4_5_mode mode) { uint32_t value; int retval; struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target); + struct reg_cache *cache = armv4_5->core_cache; + uint32_t cpsr = 0; + unsigned cookie = num; - /* FIXME cortex may not be in "mode" ... */ - - cortex_a8_dap_read_coreregister_u32(target, &value, num); + /* avoid some needless mode changes + * FIXME move some of these to shared ARM code... + */ + if (mode != armv4_5->core_mode) { + if ((armv4_5->core_mode == ARMV4_5_MODE_SYS) + && (mode == ARMV4_5_MODE_USR)) + mode = ARMV4_5_MODE_ANY; + else if ((mode != ARMV4_5_MODE_FIQ) && (num <= 12)) + mode = ARMV4_5_MODE_ANY; + + if (mode != ARMV4_5_MODE_ANY) { + cpsr = buf_get_u32(cache ->reg_list[ARMV4_5_CPSR] + .value, 0, 32); + cortex_a8_write_core_reg(target, 16, + ARMV4_5_MODE_ANY, mode); + } + } - if ((retval = jtag_execute_queue()) != ERROR_OK) - { - return retval; + if (num == 16) { + switch (mode) { + case ARMV4_5_MODE_USR: + case ARMV4_5_MODE_SYS: + case ARMV4_5_MODE_ANY: + /* CPSR */ + break; + default: + /* SPSR */ + cookie++; + break; + } } - ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, mode, num).valid = 1; - ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, mode, num).dirty = 0; - buf_set_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, - mode, num).value, 0, 32, value); + cortex_a8_dap_read_coreregister_u32(target, &value, cookie); + retval = jtag_execute_queue(); + if (retval == ERROR_OK) { + struct reg *r = &ARMV4_5_CORE_REG_MODE(cache, mode, num); - return ERROR_OK; + r->valid = 1; + r->dirty = 0; + buf_set_u32(r->value, 0, 32, value); + } + + if (cpsr) + cortex_a8_write_core_reg(target, 16, ARMV4_5_MODE_ANY, cpsr); + return retval; } static int cortex_a8_write_core_reg(struct target *target, int num, @@ -979,19 +1029,55 @@ static int cortex_a8_write_core_reg(struct target *target, int num, { int retval; struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target); + struct reg_cache *cache = armv4_5->core_cache; + uint32_t cpsr = 0; + unsigned cookie = num; - /* FIXME cortex may not be in "mode" ... */ + /* avoid some needless mode changes + * FIXME move some of these to shared ARM code... + */ + if (mode != armv4_5->core_mode) { + if ((armv4_5->core_mode == ARMV4_5_MODE_SYS) + && (mode == ARMV4_5_MODE_USR)) + mode = ARMV4_5_MODE_ANY; + else if ((mode != ARMV4_5_MODE_FIQ) && (num <= 12)) + mode = ARMV4_5_MODE_ANY; + + if (mode != ARMV4_5_MODE_ANY) { + cpsr = buf_get_u32(cache ->reg_list[ARMV4_5_CPSR] + .value, 0, 32); + cortex_a8_write_core_reg(target, 16, + ARMV4_5_MODE_ANY, mode); + } + } - cortex_a8_dap_write_coreregister_u32(target, value, num); - if ((retval = jtag_execute_queue()) != ERROR_OK) - { - return retval; + + if (num == 16) { + switch (mode) { + case ARMV4_5_MODE_USR: + case ARMV4_5_MODE_SYS: + case ARMV4_5_MODE_ANY: + /* CPSR */ + break; + default: + /* SPSR */ + cookie++; + break; + } } - ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, mode, num).valid = 1; - ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, mode, num).dirty = 0; + cortex_a8_dap_write_coreregister_u32(target, value, cookie); + if ((retval = jtag_execute_queue()) == ERROR_OK) { + struct reg *r = &ARMV4_5_CORE_REG_MODE(cache, mode, num); - return ERROR_OK; + buf_set_u32(r->value, 0, 32, value); + r->valid = 1; + r->dirty = 0; + } + + if (cpsr) + cortex_a8_write_core_reg(target, 16, ARMV4_5_MODE_ANY, cpsr); + return retval; } |