linux/arch/x86/include/asm/alternative-asm.h
Andy Lutomirski 59e97e4d6f x86: Make alternative instruction pointers relative
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>
2011-07-13 11:22:56 -07:00

28 lines
388 B
C

#ifdef __ASSEMBLY__
#include <asm/asm.h>
#ifdef CONFIG_SMP
.macro LOCK_PREFIX
1: lock
.section .smp_locks,"a"
.balign 4
.long 1b - .
.previous
.endm
#else
.macro LOCK_PREFIX
.endm
#endif
.macro altinstruction_entry orig alt feature orig_len alt_len
.align 8
.long \orig - .
.long \alt - .
.word \feature
.byte \orig_len
.byte \alt_len
.endm
#endif /* __ASSEMBLY__ */