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-rw-r--r--payloads/libpayload/arch/armv7/exception.c31
-rw-r--r--payloads/libpayload/arch/armv7/exception_asm.S3
2 files changed, 27 insertions, 7 deletions
diff --git a/payloads/libpayload/arch/armv7/exception.c b/payloads/libpayload/arch/armv7/exception.c
index 9efc312833..8d8b50b175 100644
--- a/payloads/libpayload/arch/armv7/exception.c
+++ b/payloads/libpayload/arch/armv7/exception.c
@@ -43,20 +43,32 @@ void exception_not_used(uint32_t *);
void exception_irq(uint32_t *);
void exception_fiq(uint32_t *);
+static void dump_stack(uintptr_t addr, size_t bytes)
+{
+ int i, j;
+ const int line = 8;
+ uint32_t *ptr = (uint32_t *)(addr & ~(line * sizeof(*ptr) - 1));
+
+ printf("Dumping stack:\n");
+ for (i = bytes / sizeof(*ptr); i >= 0; i -= line) {
+ printf("%p: ", ptr + i);
+ for (j = i; j < i + line; j++)
+ printf("%08x ", *(ptr + j));
+ printf("\n");
+ }
+}
+
static void print_regs(uint32_t *regs)
{
int i;
- /* Don't print the link register and stack pointer since we don't have their
- * actual value. They are hidden by the 'shadow' registers provided
- * by the trap hardware.
- */
+
for (i = 0; i < 16; i++) {
if (i == 15)
printf("PC");
else if (i == 14)
- continue; /* LR */
+ printf("LR");
else if (i == 13)
- continue; /* SP */
+ printf("SP");
else if (i == 12)
printf("IP");
else
@@ -69,6 +81,7 @@ void exception_undefined_instruction(uint32_t *regs)
{
printf("exception _undefined_instruction\n");
print_regs(regs);
+ dump_stack(regs[13], 512);
halt();
}
@@ -76,6 +89,7 @@ void exception_software_interrupt(uint32_t *regs)
{
printf("exception _software_interrupt\n");
print_regs(regs);
+ dump_stack(regs[13], 512);
halt();
}
@@ -83,6 +97,7 @@ void exception_prefetch_abort(uint32_t *regs)
{
printf("exception _prefetch_abort\n");
print_regs(regs);
+ dump_stack(regs[13], 512);
halt();
}
@@ -94,6 +109,7 @@ void exception_data_abort(uint32_t *regs)
} else {
printf("exception _data_abort\n");
print_regs(regs);
+ dump_stack(regs[13], 512);
}
halt();
}
@@ -102,6 +118,7 @@ void exception_not_used(uint32_t *regs)
{
printf("exception _not_used\n");
print_regs(regs);
+ dump_stack(regs[13], 512);
halt();
}
@@ -109,6 +126,7 @@ void exception_irq(uint32_t *regs)
{
printf("exception _irq\n");
print_regs(regs);
+ dump_stack(regs[13], 512);
halt();
}
@@ -116,6 +134,7 @@ void exception_fiq(uint32_t *regs)
{
printf("exception _fiq\n");
print_regs(regs);
+ dump_stack(regs[13], 512);
halt();
}
diff --git a/payloads/libpayload/arch/armv7/exception_asm.S b/payloads/libpayload/arch/armv7/exception_asm.S
index e46f4bcf6b..163fdbd52a 100644
--- a/payloads/libpayload/arch/armv7/exception_asm.S
+++ b/payloads/libpayload/arch/armv7/exception_asm.S
@@ -79,6 +79,7 @@ exception_common:
str sp, exception_handler
ldr sp, exception_stack_end
push { lr }
+ stmfd sp, { sp, lr }^
sub sp, sp, $8
push { r0 - r12 }
mov r0, sp
@@ -86,7 +87,7 @@ exception_common:
ldr pc, exception_handler
pop { r0 - r12 }
add sp, sp, $8
- ldm sp!, { pc }^
+ ldmfd sp!, { pc }^
_undefined_instruction: .word exception_undefined_instruction