diff options
author | Julius Werner <jwerner@chromium.org> | 2016-05-20 18:06:22 -0700 |
---|---|---|
committer | Julius Werner <jwerner@chromium.org> | 2016-05-24 20:51:28 +0200 |
commit | 2c51572435e8d7bded99ff4c83fc392cdae47772 (patch) | |
tree | 35ceee8581525533d9209775407a3bcc3b7307dd /src | |
parent | c123ccfa127b58a20ad3efa800c0e73f307f0ac5 (diff) |
arm64: Add stack dump to exception handler
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>
Diffstat (limited to 'src')
-rw-r--r-- | src/arch/arm64/armv8/exception.c | 38 |
1 files changed, 28 insertions, 10 deletions
diff --git a/src/arch/arm64/armv8/exception.c b/src/arch/arm64/armv8/exception.c index b872a55a8a..c5cbbfea3b 100644 --- a/src/arch/arm64/armv8/exception.c +++ b/src/arch/arm64/armv8/exception.c @@ -57,22 +57,38 @@ static const char *exception_names[NUM_EXC_VIDS] = { [EXC_VID_LOW32_SERR] = "_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)); + + printk(BIOS_DEBUG, "Dumping stack:\n"); + for (i = bytes / sizeof(*ptr); i >= 0; i -= words_per_line) { + printk(BIOS_DEBUG, "%p: ", ptr + i); + for (j = i; j < i + words_per_line; j++) + printk(BIOS_DEBUG, "%016llx ", *(ptr + j)); + printk(BIOS_DEBUG, "\n"); + } +} + static void print_regs(struct exc_state *exc_state) { int i; struct elx_state *elx = &exc_state->elx; struct regs *regs = &exc_state->regs; - uint64_t elx_esr = raw_read_esr_current(); - uint64_t elx_far = raw_read_far_current(); - - printk(BIOS_DEBUG, "ELR = 0x%016llx\n", elx->elr); - printk(BIOS_DEBUG, "ESR = 0x%016llx\n", elx_esr); - printk(BIOS_DEBUG, "SPSR = 0x%08llx\n", elx->spsr); - printk(BIOS_DEBUG, "FAR = 0x%016llx\n", elx_far); - printk(BIOS_DEBUG, "SP = 0x%016llx\n", regs->sp); - for (i = X0_INDEX; i < XMAX_INDEX; i++) - printk(BIOS_DEBUG, "X%02d = 0x%016llx\n", i, regs->x[i]); + printk(BIOS_DEBUG, "ELR = 0x%016llx ESR = 0x%08x\n", + elx->elr, raw_read_esr_current()); + printk(BIOS_DEBUG, "FAR = 0x%016llx SPSR = 0x%08x\n", + raw_read_far_current(), raw_read_spsr_current()); + for (i = 0; i < 30; i += 2) { + printk(BIOS_DEBUG, + "X%02d = 0x%016llx X%02d = 0x%016llx\n", + i, regs->x[i], i + 1, regs->x[i + 1]); + } + printk(BIOS_DEBUG, "X30 = 0x%016llx SP = 0x%016llx\n", + regs->x[30], regs->sp); } @@ -119,6 +135,8 @@ static void print_exception_info(struct exc_state *state, uint64_t idx) printk(BIOS_DEBUG, "exception %s\n", exception_names[idx]); print_regs(state); + /* Few words below SP in case we need state from a returned function. */ + dump_stack(state->regs.sp - 32, 512); } static void print_exception_and_die(struct exc_state *state, uint64_t idx) |