If an exception occurs in a loaded image and the relocation offset is
unknown, it is helful to know the instructions pointed to by the
program counter. This patch adds the missing output.
A possible output is:
*pc: fb de f7 e7 1e ff 2f e1 01 00 50 e3 f0 4d 2d e9 01 80 a0 e1
The output can be disassembled with
xxd -pc -r - > a.out
$(CROSS_COMPILE)objdump -D -marm -b binary a.out
Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
---
v2
print bytes not halfwords
---
arch/arm/lib/interrupts.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/arm/lib/interrupts.c b/arch/arm/lib/interrupts.c
index 28ba3f14f36..25489e34462 100644
--- a/arch/arm/lib/interrupts.c
+++ b/arch/arm/lib/interrupts.c
@@ -59,6 +59,9 @@ static void show_efi_loaded_images(struct pt_regs *regs)
void show_regs (struct pt_regs *regs)
{
unsigned long __maybe_unused flags;
+ /* The least significant bit chooses thumb, remove it. */
+ u8 *pc = (u8 *)(instruction_pointer(regs) & ~1);
+ int i;
const char __maybe_unused *processor_modes[] = {
"USER_26", "FIQ_26", "IRQ_26", "SVC_26",
"UK4_26", "UK5_26", "UK6_26", "UK7_26",
@@ -96,6 +99,10 @@ void show_regs (struct pt_regs *regs)
fast_interrupts_enabled (regs) ? "on" : "off",
processor_modes[processor_mode (regs)],
thumb_mode (regs) ? " (T)" : "");
+ printf("*pc:");
+ for (i = 0; i < 24; ++i)
+ printf(" %02x", pc[i]);
+ printf("\n");
}
/* fixup PC to point to the instruction leading to the exception */
--
2.14.2
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