diff options
Diffstat (limited to 'src')
-rw-r--r-- | src/target/arm_dpm.h | 14 | ||||
-rw-r--r-- | src/target/armv7a.h | 10 | ||||
-rw-r--r-- | src/target/cortex_a8.c | 52 |
3 files changed, 43 insertions, 33 deletions
diff --git a/src/target/arm_dpm.h b/src/target/arm_dpm.h index c284144a..1f32e8bc 100644 --- a/src/target/arm_dpm.h +++ b/src/target/arm_dpm.h @@ -136,4 +136,18 @@ int arm_dpm_write_dirty_registers(struct arm_dpm *, bool bpwp); void arm_dpm_report_wfar(struct arm_dpm *, uint32_t wfar); +/* Subset of DSCR bits; see ARMv7a arch spec section C10.3.1. + * Not all v7 bits are valid in v6. + */ +#define DSCR_CORE_HALTED (1 << 0) +#define DSCR_CORE_RESTARTED (1 << 1) +#define DSCR_ITR_EN (1 << 13) +#define DSCR_HALT_DBG_MODE (1 << 14) +#define DSCR_MON_DBG_MODE (1 << 15) +#define DSCR_INSTR_COMP (1 << 24) +#define DSCR_DTR_TX_FULL (1 << 29) +#define DSCR_DTR_RX_FULL (1 << 30) + +#define DSCR_ENTRY(dscr) (((dscr) >> 2) & 0xf) + #endif /* __ARM_DPM_H */ diff --git a/src/target/armv7a.h b/src/target/armv7a.h index 0d5da86f..f089c5c5 100644 --- a/src/target/armv7a.h +++ b/src/target/armv7a.h @@ -114,16 +114,6 @@ target_to_armv7a(struct target *target) /* See ARMv7a arch spec section C10.8 */ #define CPUDBG_AUTHSTATUS 0xFB8 -/* DSCR bit numbers (See ARMv7a arch spec section 12.4.5) */ -#define DSCR_CORE_HALTED 0 -#define DSCR_CORE_RESTARTED 1 -#define DSCR_EXT_INT_EN 13 -#define DSCR_HALT_DBG_MODE 14 -#define DSCR_MON_DBG_MODE 15 -#define DSCR_INSTR_COMP 24 -#define DSCR_DTR_TX_FULL 29 -#define DSCR_DTR_RX_FULL 30 - struct armv7a_algorithm { int common_magic; diff --git a/src/target/cortex_a8.c b/src/target/cortex_a8.c index 9ca072e0..14cbb9d7 100644 --- a/src/target/cortex_a8.c +++ b/src/target/cortex_a8.c @@ -91,8 +91,8 @@ static int cortex_a8_init_debug_access(struct target *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 (1 << DSCR_INSTR_COMP) if - * you happen to know that no instruction is pending. + * value on return from this function; or DSCR_INSTR_COMP if you + * happen to know that no instruction is pending. */ static int cortex_a8_exec_opcode(struct target *target, uint32_t opcode, uint32_t *dscr_p) @@ -107,7 +107,7 @@ static int cortex_a8_exec_opcode(struct target *target, LOG_DEBUG("exec opcode 0x%08" PRIx32, opcode); /* Wait for InstrCompl bit to be set */ - while ((dscr & (1 << DSCR_INSTR_COMP)) == 0) + while ((dscr & DSCR_INSTR_COMP) == 0) { retval = mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DSCR, &dscr); @@ -130,7 +130,7 @@ static int cortex_a8_exec_opcode(struct target *target, return retval; } } - while ((dscr & (1 << DSCR_INSTR_COMP)) == 0); /* Wait for InstrCompl bit to be set */ + while ((dscr & DSCR_INSTR_COMP) == 0); /* Wait for InstrCompl bit to be set */ if (dscr_p) *dscr_p = dscr; @@ -198,7 +198,7 @@ static int cortex_a8_dap_read_coreregister_u32(struct target *target, } /* Wait for DTRRXfull then read DTRRTX */ - while ((dscr & (1 << DSCR_DTR_TX_FULL)) == 0) + while ((dscr & DSCR_DTR_TX_FULL) == 0) { retval = mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DSCR, &dscr); @@ -225,7 +225,7 @@ static int cortex_a8_dap_write_coreregister_u32(struct target *target, /* Check that DCCRX is not full */ retval = mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DSCR, &dscr); - if (dscr & (1 << DSCR_DTR_RX_FULL)) + if (dscr & DSCR_DTR_RX_FULL) { LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr); /* Clear DCCRX with MCR(p14, 0, Rd, c0, c5, 0), opcode 0xEE000E15 */ @@ -315,14 +315,14 @@ static int cortex_a8_read_dcc(struct cortex_a8_common *a8, uint32_t *data, uint32_t *dscr_p) { struct swjdp_common *swjdp = &a8->armv7a_common.swjdp_info; - uint32_t dscr = 1 << DSCR_INSTR_COMP; + uint32_t dscr = DSCR_INSTR_COMP; int retval; if (dscr_p) dscr = *dscr_p; /* Wait for DTRRXfull */ - while ((dscr & (1 << DSCR_DTR_TX_FULL)) == 0) { + while ((dscr & DSCR_DTR_TX_FULL) == 0) { retval = mem_ap_read_atomic_u32(swjdp, a8->armv7a_common.debug_base + CPUDBG_DSCR, &dscr); @@ -350,10 +350,10 @@ static int cortex_a8_dpm_prepare(struct arm_dpm *dpm) retval = mem_ap_read_atomic_u32(swjdp, a8->armv7a_common.debug_base + CPUDBG_DSCR, &dscr); - } while ((dscr & (1 << DSCR_INSTR_COMP)) == 0); + } while ((dscr & DSCR_INSTR_COMP) == 0); /* this "should never happen" ... */ - if (dscr & (1 << DSCR_DTR_RX_FULL)) { + if (dscr & DSCR_DTR_RX_FULL) { LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr); /* Clear DCCRX */ retval = cortex_a8_exec_opcode( @@ -376,7 +376,7 @@ static int cortex_a8_instr_write_data_dcc(struct arm_dpm *dpm, { struct cortex_a8_common *a8 = dpm_to_a8(dpm); int retval; - uint32_t dscr = 1 << DSCR_INSTR_COMP; + uint32_t dscr = DSCR_INSTR_COMP; retval = cortex_a8_write_dcc(a8, data); @@ -390,7 +390,7 @@ static int cortex_a8_instr_write_data_r0(struct arm_dpm *dpm, uint32_t opcode, uint32_t data) { struct cortex_a8_common *a8 = dpm_to_a8(dpm); - uint32_t dscr = 1 << DSCR_INSTR_COMP; + uint32_t dscr = DSCR_INSTR_COMP; int retval; retval = cortex_a8_write_dcc(a8, data); @@ -413,7 +413,7 @@ static int cortex_a8_instr_write_data_r0(struct arm_dpm *dpm, static int cortex_a8_instr_cpsr_sync(struct arm_dpm *dpm) { struct target *target = dpm->arm->target; - uint32_t dscr = 1 << DSCR_INSTR_COMP; + uint32_t dscr = DSCR_INSTR_COMP; /* "Prefetch flush" after modifying execution status in CPSR */ return cortex_a8_exec_opcode(target, @@ -426,7 +426,7 @@ static int cortex_a8_instr_read_data_dcc(struct arm_dpm *dpm, { struct cortex_a8_common *a8 = dpm_to_a8(dpm); int retval; - uint32_t dscr = 1 << DSCR_INSTR_COMP; + uint32_t dscr = DSCR_INSTR_COMP; /* the opcode, writing data to DCC */ retval = cortex_a8_exec_opcode( @@ -442,7 +442,7 @@ static int cortex_a8_instr_read_data_r0(struct arm_dpm *dpm, uint32_t opcode, uint32_t *data) { struct cortex_a8_common *a8 = dpm_to_a8(dpm); - uint32_t dscr = 1 << DSCR_INSTR_COMP; + uint32_t dscr = DSCR_INSTR_COMP; int retval; /* the opcode, writing data to R0 */ @@ -639,7 +639,7 @@ static int cortex_a8_halt(struct target *target) */ mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DSCR, &dscr); retval = mem_ap_write_atomic_u32(swjdp, - armv7a->debug_base + CPUDBG_DSCR, dscr | (1 << DSCR_HALT_DBG_MODE)); + armv7a->debug_base + CPUDBG_DSCR, dscr | DSCR_HALT_DBG_MODE); if (retval != ERROR_OK) goto out; @@ -647,7 +647,7 @@ static int cortex_a8_halt(struct target *target) do { mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DSCR, &dscr); - } while ((dscr & (1 << DSCR_CORE_HALTED)) == 0); + } while ((dscr & DSCR_CORE_HALTED) == 0); target->debug_reason = DBG_REASON_DBGRQ; @@ -742,13 +742,18 @@ static int cortex_a8_resume(struct target *target, int current, } #endif - /* Restart core and wait for it to be started */ + /* Restart core and wait for it to be started + * NOTE: this clears DSCR_ITR_EN and other bits. + * + * REVISIT: for single stepping, we probably want to + * disable IRQs by default, with optional override... + */ mem_ap_write_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DRCR, 0x2); do { mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DSCR, &dscr); - } while ((dscr & (1 << DSCR_CORE_RESTARTED)) == 0); + } while ((dscr & DSCR_CORE_RESTARTED) == 0); target->debug_reason = DBG_REASON_NOTHALTED; target->state = TARGET_RUNNING; @@ -788,7 +793,6 @@ static int cortex_a8_debug_entry(struct target *target) LOG_DEBUG("dscr = 0x%08" PRIx32, cortex_a8->cpudbg_dscr); - /* Enable the ITR execution once we are in debug mode */ mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DSCR, &dscr); @@ -797,12 +801,13 @@ static int cortex_a8_debug_entry(struct target *target) * Synchronization Barrier: ARMV4_5_MCR(15, 0, 0, 7, 10, 4). */ - dscr |= (1 << DSCR_EXT_INT_EN); + /* Enable the ITR execution once we are in debug mode */ + dscr |= DSCR_ITR_EN; retval = mem_ap_write_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DSCR, dscr); /* Examine debug reason */ - switch ((cortex_a8->cpudbg_dscr >> 2)&0xF) + switch (DSCR_ENTRY(cortex_a8->cpudbg_dscr)) { case 0: /* DRCR[0] write */ case 4: /* EDBGRQ */ @@ -1005,7 +1010,8 @@ static int cortex_a8_step(struct target *target, int current, uint32_t address, } cortex_a8_unset_breakpoint(target, &stepbreakpoint); - if (timeout > 0) target->debug_reason = DBG_REASON_BREAKPOINT; + if (timeout > 0) + target->debug_reason = DBG_REASON_BREAKPOINT; if (breakpoint) cortex_a8_set_breakpoint(target, breakpoint, 0); |