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x86: Make alternative instruction pointers relative

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This save a few bytes on x86-64 and means that future patches can
apply alternatives to unrelocated code.

Signed-off-by: Andy Lutomirski <luto@mit.edu>
Link: http://lkml.kernel.org/r/ff64a6b9a1a3860ca4a7b8b6dc7b4754f9491cd7.1310563276.git.luto@mit.edu
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Andy Lutomirski
2011-07-13 09:24:10 -04:00
committed by H. Peter Anvin
parent c9712944b2
commit 59e97e4d6f
6 changed files with 31 additions and 30 deletions
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11
arch/x86/lib/memmove_64.S
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@ -9,6 +9,7 @@
#include <linux/linkage.h>
#include <asm/dwarf2.h>
#include <asm/cpufeature.h>
#include <asm/alternative-asm.h>
#undef memmove
@ -214,11 +215,9 @@ ENTRY(memmove)
.previous
.section .altinstructions,"a"
.align 8
.quad .Lmemmove_begin_forward
.quad .Lmemmove_begin_forward_efs
.word X86_FEATURE_ERMS
.byte .Lmemmove_end_forward-.Lmemmove_begin_forward
.byte .Lmemmove_end_forward_efs-.Lmemmove_begin_forward_efs
altinstruction_entry .Lmemmove_begin_forward, \
.Lmemmove_begin_forward_efs,X86_FEATURE_ERMS, \
.Lmemmove_end_forward-.Lmemmove_begin_forward, \
.Lmemmove_end_forward_efs-.Lmemmove_begin_forward_efs
.previous
ENDPROC(memmove)