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arm64: Add stack dump to exception handler

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Some exceptions (like from calling a NULL function pointer) are easier
to narrow down with a dump of the call stack. Let's take a page out of
ARM32's book and add that feature to ARM64 as well. Also change the
output format to two register columns, to make it easier to fit a whole
exception dump on one screen.

Applying to both coreboot and libpayload and syncing the output format
between both back up.

Change-Id: I19768d13d8fa8adb84f0edda2af12f20508eb2db
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/14931
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Julius Werner
2016-05-20 18:06:22 -07:00
parent c123ccfa12
commit 2c51572435
2 changed files with 54 additions and 14 deletions
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30
payloads/libpayload/arch/arm64/exception.c
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@ -60,15 +60,35 @@ static struct exception_handler_info exceptions[EXC_COUNT] = {
[EXC_SERROR_ELX_32] = {"_serror_elx_32"},
};
static void dump_stack(uintptr_t addr, size_t bytes)
{
int i, j;
const int words_per_line = 8;
uint64_t *ptr = (void *)ALIGN_DOWN(addr, words_per_line * sizeof(*ptr));
printf("Dumping stack:\n");
for (i = bytes / sizeof(*ptr); i >= 0; i -= words_per_line) {
printf("%p: ", ptr + i);
for (j = i; j < i + words_per_line; j++)
printf("%016llx ", *(ptr + j));
printf("\n");
}
}
static void print_regs(struct exception_state *state)
{
int i;
printf("ELR = 0x%016llx\n",state->elr);
printf("ESR = 0x%08llx\n",state->esr);
for (i = 0; i < 31; i++) {
printf("X%02d = 0x%016llx\n", i, state->regs[i]);
printf("ELR = 0x%016llx ESR = 0x%08llx\n",
state->elr, state->esr);
printf("FAR = 0x%016llx SPSR = 0x%08x\n",
raw_read_far_current(), raw_read_spsr_current());
for (i = 0; i < 30; i += 2) {
printf("X%02d = 0x%016llx X%02d = 0x%016llx\n",
i, state->regs[i], i + 1, state->regs[i + 1]);
}
printf("X30 = 0x%016llx SP = 0x%016llx\n",
state->regs[30], raw_read_sp_el0());
}
void exception_dispatch(struct exception_state *state, int idx);
@ -89,6 +109,8 @@ void exception_dispatch(struct exception_state *state, int idx)
printf("exception _not_used.\n");
}
print_regs(state);
/* Few words below SP in case we need state from a returned function. */
dump_stack(raw_read_sp_el0() - 32, 512);
if (test_exc) {
state->elr += 4;