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aarch64: use cached value of dscr register where needed 

Instead of supplying a local, preinitialized "dscr" variable, use the
cached value from arm_dpm, which is kept up-to-date anyway.

Change-Id: I06d548d4dc6db68b9d984c83ed026fa9069d7875
Signed-off-by: Matthias Welwarsky <matthias.welwarsky@sysgo.com>
This commit is contained in:
Matthias Welwarsky 2016-10-20 17:22:26 +02:00
parent 9166320663
commit 9d2e8aabb8
1 changed files with 21 additions and 25 deletions
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46
src/target/armv8_dpm.c
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@ -82,7 +82,8 @@ static int dpmv8_write_dcc_64(struct armv8_common *armv8, uint64_t data)
LOG_DEBUG("write DCC 0x%016" PRIx64, data);
ret = mem_ap_write_u32(armv8->debug_ap,
armv8->debug_base + CPUV8_DBG_DTRRX, data);
ret += mem_ap_write_u32(armv8->debug_ap,
if (ret == ERROR_OK)
ret = mem_ap_write_u32(armv8->debug_ap,
armv8->debug_base + CPUV8_DBG_DTRTX, data >> 32);
return ret;
}
@ -174,7 +175,7 @@ static int dpmv8_dpm_prepare(struct arm_dpm *dpm)
uint32_t dscr;
int retval;
/* set up invariant: INSTR_COMP is set after ever DPM operation */
/* set up invariant: ITE is set after ever DPM operation */
long long then = timeval_ms();
for (;; ) {
retval = mem_ap_read_atomic_u32(armv8->debug_ap,
@ -216,7 +217,7 @@ 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;
uint32_t dscr = dpm->dscr;
int retval;
LOG_DEBUG("exec opcode 0x%08" PRIx32, opcode);
@ -333,19 +334,18 @@ 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;
/* transfer data from DCC to R0 */
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;
if (retval == ERROR_OK)
retval = dpmv8_exec_opcode(dpm, ARMV8_MRS(SYSTEM_DBG_DBGDTR_EL0, 0), &dpm->dscr);
/* then the opcode, taking data from R0 */
return dpmv8_exec_opcode(dpm, opcode, &dscr);
if (retval == ERROR_OK)
retval = dpmv8_exec_opcode(dpm, opcode, &dpm->dscr);
return retval;
}
static int dpmv8_instr_cpsr_sync(struct arm_dpm *dpm)
@ -364,70 +364,66 @@ 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);
retval = dpmv8_exec_opcode(dpm, opcode, &dpm->dscr);
if (retval != ERROR_OK)
return retval;
return dpmv8_read_dcc(armv8, data, &dscr);
return dpmv8_read_dcc(armv8, data, &dpm->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);
retval = dpmv8_exec_opcode(dpm, opcode, &dpm->dscr);
if (retval != ERROR_OK)
return retval;
return dpmv8_read_dcc_64(armv8, data, &dscr);
return dpmv8_read_dcc_64(armv8, data, &dpm->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);
retval = dpmv8_exec_opcode(dpm, opcode, &dpm->dscr);
if (retval != ERROR_OK)
return retval;
/* write R0 to DCC */
retval = dpmv8_exec_opcode(dpm, armv8_opcode(armv8, WRITE_REG_DTRTX), &dscr);
retval = dpmv8_exec_opcode(dpm, armv8_opcode(armv8, WRITE_REG_DTRTX), &dpm->dscr);
if (retval != ERROR_OK)
return retval;
return dpmv8_read_dcc(armv8, data, &dscr);
return dpmv8_read_dcc(armv8, data, &dpm->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);
retval = dpmv8_exec_opcode(dpm, opcode, &dpm->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);
retval = dpmv8_exec_opcode(dpm, ARMV8_MSR_GP(SYSTEM_DBG_DBGDTR_EL0, 0), &dpm->dscr);
if (retval != ERROR_OK)
return retval;
return dpmv8_read_dcc_64(armv8, data, &dscr);
return dpmv8_read_dcc_64(armv8, data, &dpm->dscr);
}
#if 0