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| author | Heinrich Schuchardt <xypron.glpk@gmx.de> | 2018-05-15 19:42:23 +0200 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2018-05-23 22:06:41 -0400 |
| commit | bd2a13f32959a851d43d9681d9dc9b8bb3eec398 (patch) | |
| tree | 5f7426ab078c939cf1c1ea5771b85452a2b2e784 /arch/arm/lib/interrupts.c | |
| parent | d0f855f221307dcbaeeef5a58c5ce816d0af6750 (diff) | |
| download | u-boot-bd2a13f32959a851d43d9681d9dc9b8bb3eec398.tar.gz u-boot-bd2a13f32959a851d43d9681d9dc9b8bb3eec398.tar.bz2 u-boot-bd2a13f32959a851d43d9681d9dc9b8bb3eec398.zip | |
arm: print instructions pointed to by pc
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>
Diffstat (limited to 'arch/arm/lib/interrupts.c')
| -rw-r--r-- | arch/arm/lib/interrupts.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/arm/lib/interrupts.c b/arch/arm/lib/interrupts.c index 28ba3f14f3..930b25ccb8 100644 --- a/arch/arm/lib/interrupts.c +++ b/arch/arm/lib/interrupts.c @@ -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 */ |