x86: Extend #DF debugging aid to 64-bit

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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>

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This commit is contained in:

Borislav Petkov 2013-05-09 12:02:29 +02:00 • committed by H. Peter Anvin

parent f722406faa

commit 4d067d8e05

6 changed files with 89 additions and 72 deletions

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1

arch/x86/Kconfig.debug

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2

arch/x86/include/asm/processor.h

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arch/x86/kernel/Makefile

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15

arch/x86/kernel/doublefault_32.c → arch/x86/kernel/doublefault.c

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3

arch/x86/kernel/traps.c

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