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aarch64: fix debug entry from EL0 

If we enter debug state from EL0, some registers are not accessible.
Temporarily move to EL1H and back to gain access. Also, fix
armv8_dpm_modeswitch() to not immediately restore the previous state
on elevating the privilege level.

Change-Id: Ic2a92109230ff4eb6834c00ef544397a5b7ad56a
Signed-off-by: Matthias Welwarsky <matthias.welwarsky@sysgo.com>
Reviewed-on: http://openocd.zylin.com/4461
Tested-by: jenkins
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>
This commit is contained in:
Matthias Welwarsky 2018-03-12 16:56:05 +01:00 committed by Matthias Welwarsky
parent 935f0c5cc2
commit ffd6b78a2c
5 changed files with 26 additions and 7 deletions
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4
src/target/aarch64.c
View File

@ -1861,7 +1861,7 @@ static int aarch64_write_cpu_memory(struct target *target,
if (dscr & (DSCR_ERR | DSCR_SYS_ERROR_PEND)) {
/* Abort occurred - clear it and exit */
LOG_ERROR("abort occurred - dscr = 0x%08" PRIx32, dscr);
armv8_dpm_handle_exception(dpm);
armv8_dpm_handle_exception(dpm, true);
return ERROR_FAIL;
}
@ -2080,7 +2080,7 @@ static int aarch64_read_cpu_memory(struct target *target,
if (dscr & (DSCR_ERR | DSCR_SYS_ERROR_PEND)) {
/* Abort occurred - clear it and exit */
LOG_ERROR("abort occurred - dscr = 0x%08" PRIx32, dscr);
armv8_dpm_handle_exception(dpm);
armv8_dpm_handle_exception(dpm, true);
return ERROR_FAIL;
}

9
src/target/armv8.c
View File

@ -620,6 +620,7 @@ void armv8_select_reg_access(struct armv8_common *armv8, bool is_aarch64)
int armv8_read_mpidr(struct armv8_common *armv8)
{
int retval = ERROR_FAIL;
struct arm *arm = &armv8->arm;
struct arm_dpm *dpm = armv8->arm.dpm;
uint32_t mpidr;
@ -627,6 +628,13 @@ int armv8_read_mpidr(struct armv8_common *armv8)
if (retval != ERROR_OK)
goto done;
/* check if we're in an unprivileged mode */
if (armv8_curel_from_core_mode(arm->core_mode) < SYSTEM_CUREL_EL1) {
retval = armv8_dpm_modeswitch(dpm, ARMV8_64_EL1H);
if (retval != ERROR_OK)
return retval;
}
retval = dpm->instr_read_data_r0(dpm, armv8_opcode(armv8, READ_REG_MPIDR), &mpidr);
if (retval != ERROR_OK)
goto done;
@ -642,6 +650,7 @@ int armv8_read_mpidr(struct armv8_common *armv8)
LOG_ERROR("mpidr not in multiprocessor format");
done:
armv8_dpm_modeswitch(dpm, ARM_MODE_ANY);
dpm->finish(dpm);
return retval;
}

9
src/target/armv8_cache.c
View File

@ -310,6 +310,7 @@ int armv8_identify_cache(struct armv8_common *armv8)
{
/* read cache descriptor */
int retval = ERROR_FAIL;
struct arm *arm = &armv8->arm;
struct arm_dpm *dpm = armv8->arm.dpm;
uint32_t csselr, clidr, ctr;
uint32_t cache_reg;
@ -320,6 +321,13 @@ int armv8_identify_cache(struct armv8_common *armv8)
if (retval != ERROR_OK)
goto done;
/* check if we're in an unprivileged mode */
if (armv8_curel_from_core_mode(arm->core_mode) < SYSTEM_CUREL_EL1) {
retval = armv8_dpm_modeswitch(dpm, ARMV8_64_EL1H);
if (retval != ERROR_OK)
return retval;
}
/* retrieve CTR */
retval = dpm->instr_read_data_r0(dpm,
armv8_opcode(armv8, READ_REG_CTR), &ctr);
@ -417,6 +425,7 @@ int armv8_identify_cache(struct armv8_common *armv8)
}
done:
armv8_dpm_modeswitch(dpm, ARM_MODE_ANY);
dpm->finish(dpm);
return retval;

9
src/target/armv8_dpm.c
View File

@ -258,7 +258,7 @@ static int dpmv8_exec_opcode(struct arm_dpm *dpm,
if (dscr & DSCR_ERR) {
LOG_ERROR("Opcode 0x%08"PRIx32", DSCR.ERR=1, DSCR.EL=%i", opcode, dpm->last_el);
armv8_dpm_handle_exception(dpm);
armv8_dpm_handle_exception(dpm, true);
retval = ERROR_FAIL;
}
@ -600,7 +600,7 @@ int armv8_dpm_modeswitch(struct arm_dpm *dpm, enum arm_mode mode)
armv8_opcode(armv8, ARMV8_OPC_DCPS) | target_el);
/* DCPS clobbers registers just like an exception taken */
armv8_dpm_handle_exception(dpm);
armv8_dpm_handle_exception(dpm, false);
} else {
core_state = armv8_dpm_get_core_state(dpm);
if (core_state != ARM_STATE_AARCH64) {
@ -1298,7 +1298,7 @@ void armv8_dpm_report_wfar(struct arm_dpm *dpm, uint64_t addr)
* This function must not perform any actions that trigger another exception
* or a recursion will happen.
*/
void armv8_dpm_handle_exception(struct arm_dpm *dpm)
void armv8_dpm_handle_exception(struct arm_dpm *dpm, bool do_restore)
{
struct armv8_common *armv8 = dpm->arm->arch_info;
struct reg_cache *cache = dpm->arm->core_cache;
@ -1344,7 +1344,8 @@ void armv8_dpm_handle_exception(struct arm_dpm *dpm)
armv8_select_opcodes(armv8, core_state == ARM_STATE_AARCH64);
armv8_select_reg_access(armv8, core_state == ARM_STATE_AARCH64);
armv8_dpm_modeswitch(dpm, ARM_MODE_ANY);
if (do_restore)
armv8_dpm_modeswitch(dpm, ARM_MODE_ANY);
}
/*----------------------------------------------------------------------*/

2
src/target/armv8_dpm.h
View File

@ -116,7 +116,7 @@ void armv8_dpm_report_wfar(struct arm_dpm *, uint64_t wfar);
#define PRCR_COREPURQ (1 << 3)
void armv8_dpm_report_dscr(struct arm_dpm *dpm, uint32_t dcsr);
void armv8_dpm_handle_exception(struct arm_dpm *dpm);
void armv8_dpm_handle_exception(struct arm_dpm *dpm, bool do_restore);
enum arm_state armv8_dpm_get_core_state(struct arm_dpm *dpm);
#endif /* OPENOCD_TARGET_ARM_DPM_H */