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arm: print instructions pointed to by pc

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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:
    Code: e1c560d0 e12fff1e e120077b e12fff1e (e7f7defb)

The parentheses indicate the instruction causing the exception.

The output can be disassembled using the decodecode script provided
by the Linux kernel project.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2018-05-15 19:42:23 +02:00 committed by Tom Rini
parent d0f855f221
commit bd2a13f329
1 changed files with 25 additions and 0 deletions
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25
arch/arm/lib/interrupts.c
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@ -56,6 +56,30 @@ static void show_efi_loaded_images(struct pt_regs *regs)
efi_print_image_infos((void *)instruction_pointer(regs));
}
static void dump_instr(struct pt_regs *regs)
{
unsigned long addr = instruction_pointer(regs);
const int thumb = thumb_mode(regs);
const int width = thumb ? 4 : 8;
int i;
if (thumb)
addr &= ~1L;
else
addr &= ~3L;
printf("Code: ");
for (i = -4; i < 1 + !!thumb; i++) {
unsigned int val;
if (thumb)
val = ((u16 *)addr)[i];
else
val = ((u32 *)addr)[i];
printf(i == 0 ? "(%0*x) " : "%0*x ", width, val);
}
printf("\n");
}
void show_regs (struct pt_regs *regs)
{
unsigned long __maybe_unused flags;
@ -96,6 +120,7 @@ void show_regs (struct pt_regs *regs)
fast_interrupts_enabled (regs) ? "on" : "off",
processor_modes[processor_mode (regs)],
thumb_mode (regs) ? " (T)" : "");
dump_instr(regs);
}
/* fixup PC to point to the instruction leading to the exception */