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powerpc/traps: Show instructions on exceptions
author
Murilo Opsfelder Araujo
<muriloo@linux.ibm.com>
Wed, 1 Aug 2018 21:33:20 +0000
(18:33 -0300)
committer
Michael Ellerman
<mpe@ellerman.id.au>
Tue, 7 Aug 2018 14:32:30 +0000
(
00:32
+1000)
Call show_user_instructions() in arch/powerpc/kernel/traps.c to dump
instructions at faulty location, useful to debugging.
Before this patch, an unhandled signal message looked like:
pandafault[10524]: segfault (11) at
100007d0
nip
1000061c
lr
7fffbd295100
code 2 in pandafault[
10000000
+10000]
After this patch, it looks like:
pandafault[10524]: segfault (11) at
100007d0
nip
1000061c
lr
7fffbd295100
code 2 in pandafault[
10000000
+10000]
pandafault[10524]: code:
4bfffeec
4bfffee8
3c401002
38427f00
fbe1fff8
f821ffc1
7c3f0b78
3d22fffe
pandafault[10524]: code:
392988d0
f93f0020
e93f0020
39400048
<
99490000
>
39200000
7d234b78
383f0040
Signed-off-by: Murilo Opsfelder Araujo <muriloo@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
arch/powerpc/kernel/traps.c
patch
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blob
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diff --git
a/arch/powerpc/kernel/traps.c
b/arch/powerpc/kernel/traps.c
index
171c504
..
070e96f
100644
(file)
--- a/
arch/powerpc/kernel/traps.c
+++ b/
arch/powerpc/kernel/traps.c
@@
-70,6
+70,7
@@
#include <asm/hmi.h>
#include <sysdev/fsl_pci.h>
#include <asm/kprobes.h>
+#include <asm/stacktrace.h>
#if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC_CORE)
int (*__debugger)(struct pt_regs *regs) __read_mostly;
@@
-337,6
+338,8
@@
static void show_signal_msg(int signr, struct pt_regs *regs, int code,
print_vma_addr(KERN_CONT " in ", regs->nip);
pr_cont("\n");
+
+ show_user_instructions(regs);
}
void _exception_pkey(int signr, struct pt_regs *regs, int code,