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| author | Borislav Petkov <bp@suse.de> | 2013-05-09 12:02:29 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2013-05-13 13:42:44 -0700 |
| commit | 4d067d8e056d76a3327f0517c7722db55e7888fc (patch) | |
| tree | 995c147a839866f5d1c2c700c27214755054cd7d /arch/x86/kernel/traps.c | |
| parent | f722406faae2d073cc1d01063d1123c35425939e (diff) | |
| download | blackbird-op-linux-4d067d8e056d76a3327f0517c7722db55e7888fc.tar.gz blackbird-op-linux-4d067d8e056d76a3327f0517c7722db55e7888fc.zip | |
x86: Extend #DF debugging aid to 64-bit
It is sometimes very helpful to be able to pinpoint the location which
causes a double fault before it turns into a triple fault and the
machine reboots. We have this for 32-bit already so extend it to 64-bit.
On 64-bit we get the register snapshot at #DF time and not from the
first exception which actually causes the #DF. It should be close
enough, though.
[ hpa: and definitely better than nothing, which is what we have now. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1368093749-31296-1-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel/traps.c')
| -rw-r--r-- | arch/x86/kernel/traps.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 772e2a846dec..167d481c5fd3 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -254,6 +254,9 @@ dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code) tsk->thread.error_code = error_code; tsk->thread.trap_nr = X86_TRAP_DF; +#ifdef CONFIG_DOUBLEFAULT + df_debug(regs, error_code); +#endif /* * This is always a kernel trap and never fixable (and thus must * never return). |
