diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/target/mips_ejtag.h | 5 | ||||
| -rw-r--r-- | src/target/mips_m4k.c | 115 |
2 files changed, 116 insertions, 4 deletions
diff --git a/src/target/mips_ejtag.h b/src/target/mips_ejtag.h index f8ed423e..274392a8 100644 --- a/src/target/mips_ejtag.h +++ b/src/target/mips_ejtag.h @@ -96,6 +96,11 @@ #define EJTAG_IBA1 0xFF301100 #define EJTAG_DBS 0xFF302000 #define EJTAG_DBA1 0xFF302100 +#define EJTAG_DBCn_NOSB (1 << 13) +#define EJTAG_DBCn_NOLB (1 << 12) +#define EJTAG_DBCn_BLM_MASK 0xff +#define EJTAG_DBCn_BLM_SHIFT 4 +#define EJTAG_DBCn_BE (1 << 0) typedef struct mips_ejtag_s { diff --git a/src/target/mips_m4k.c b/src/target/mips_m4k.c index 5a3fe1cf..07ecb556 100644 --- a/src/target/mips_m4k.c +++ b/src/target/mips_m4k.c @@ -693,25 +693,132 @@ int mips_m4k_remove_breakpoint(struct target_s *target, breakpoint_t *breakpoint int mips_m4k_set_watchpoint(struct target_s *target, watchpoint_t *watchpoint) { - /* TODO */ + mips32_common_t *mips32 = target->arch_info; + mips32_comparator_t * comparator_list = mips32->data_break_list; + int wp_num = 0; + /* + * watchpoint enabled, ignore all byte lanes in value register + * and exclude both load and store accesses from watchpoint + * condition evaluation + */ + int enable = EJTAG_DBCn_NOSB | EJTAG_DBCn_NOLB | EJTAG_DBCn_BE | + (0xff << EJTAG_DBCn_BLM_SHIFT); + + if (watchpoint->set) + { + LOG_WARNING("watchpoint already set"); + return ERROR_OK; + } + + while(comparator_list[wp_num].used && (wp_num < mips32->num_data_bpoints)) + wp_num++; + if (wp_num >= mips32->num_data_bpoints) + { + LOG_DEBUG("ERROR Can not find free FP Comparator"); + LOG_WARNING("ERROR Can not find free FP Comparator"); + exit(-1); + } + + if (watchpoint->length != 4) + { + LOG_ERROR("Only watchpoints of length 4 are supported"); + return ERROR_TARGET_UNALIGNED_ACCESS; + } + + if (watchpoint->address % 4) + { + LOG_ERROR("Watchpoints address should be word aligned"); + return ERROR_TARGET_UNALIGNED_ACCESS; + } + + switch (watchpoint->rw) + { + case WPT_READ: + enable &= ~EJTAG_DBCn_NOLB; + break; + case WPT_WRITE: + enable &= ~EJTAG_DBCn_NOSB; + break; + case WPT_ACCESS: + enable &= ~(EJTAG_DBCn_NOLB | EJTAG_DBCn_NOSB); + break; + default: + LOG_ERROR("BUG: watchpoint->rw neither read, write nor access"); + } + + watchpoint->set = wp_num + 1; + comparator_list[wp_num].used = 1; + comparator_list[wp_num].bp_value = watchpoint->address; + target_write_u32(target, comparator_list[wp_num].reg_address, comparator_list[wp_num].bp_value); + target_write_u32(target, comparator_list[wp_num].reg_address + 0x08, 0x00000000); + target_write_u32(target, comparator_list[wp_num].reg_address + 0x10, 0x00000000); + target_write_u32(target, comparator_list[wp_num].reg_address + 0x18, enable); + target_write_u32(target, comparator_list[wp_num].reg_address + 0x20, 0); + LOG_DEBUG("wp_num %i bp_value 0x%" PRIx32 "", wp_num, comparator_list[wp_num].bp_value); + return ERROR_OK; } int mips_m4k_unset_watchpoint(struct target_s *target, watchpoint_t *watchpoint) { - /* TODO */ + /* get pointers to arch-specific information */ + mips32_common_t *mips32 = target->arch_info; + mips32_comparator_t * comparator_list = mips32->data_break_list; + + if (!watchpoint->set) + { + LOG_WARNING("watchpoint not set"); + return ERROR_OK; + } + + int wp_num = watchpoint->set - 1; + if ((wp_num < 0) || (wp_num >= mips32->num_data_bpoints)) + { + LOG_DEBUG("Invalid FP Comparator number in watchpoint"); + return ERROR_OK; + } + comparator_list[wp_num].used = 0; + comparator_list[wp_num].bp_value = 0; + target_write_u32(target, comparator_list[wp_num].reg_address + 0x18, 0); + watchpoint->set = 0; + return ERROR_OK; } int mips_m4k_add_watchpoint(struct target_s *target, watchpoint_t *watchpoint) { - /* TODO */ + mips32_common_t *mips32 = target->arch_info; + + if (mips32->num_data_bpoints_avail < 1) + { + LOG_INFO("no hardware watchpoints available"); + return ERROR_TARGET_RESOURCE_NOT_AVAILABLE; + } + + mips32->num_data_bpoints_avail--; + + mips_m4k_set_watchpoint(target, watchpoint); return ERROR_OK; } int mips_m4k_remove_watchpoint(struct target_s *target, watchpoint_t *watchpoint) { - /* TODO */ + /* get pointers to arch-specific information */ + mips32_common_t *mips32 = target->arch_info; + + if (target->state != TARGET_HALTED) + { + LOG_WARNING("target not halted"); + return ERROR_TARGET_NOT_HALTED; + } + + if (watchpoint->set) + { + mips_m4k_unset_watchpoint(target, watchpoint); + } + + mips32->num_data_bpoints_avail++; + return ERROR_OK; } |