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authorHeinrich Schuchardt2018-05-15 19:42:23 +0200
committerTom Rini2018-05-23 22:06:41 -0400
commitbd2a13f32959a851d43d9681d9dc9b8bb3eec398 (patch)
tree5f7426ab078c939cf1c1ea5771b85452a2b2e784 /arch/arm
parentd0f855f221307dcbaeeef5a58c5ce816d0af6750 (diff)
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')
-rw-r--r--arch/arm/lib/interrupts.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/arm/lib/interrupts.c b/arch/arm/lib/interrupts.c
index 28ba3f14f36..930b25ccb81 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 */