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| author | Andy Lutomirski <luto@mit.edu> | 2011-07-13 09:24:10 -0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2011-07-13 11:22:56 -0700 |
| commit | 59e97e4d6fbcd5b74a94cb48bcbfc6f8478a5e93 (patch) | |
| tree | 015fd8e63e1fcd8fdf7a066bd2e09a5636a14449 /arch/x86/lib | |
| parent | c9712944b2a12373cb6ff8059afcfb7e826a6c54 (diff) | |
| download | linux-59e97e4d6fbcd5b74a94cb48bcbfc6f8478a5e93.tar.gz linux-59e97e4d6fbcd5b74a94cb48bcbfc6f8478a5e93.tar.bz2 linux-59e97e4d6fbcd5b74a94cb48bcbfc6f8478a5e93.zip | |
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>
Diffstat (limited to 'arch/x86/lib')
| -rw-r--r-- | arch/x86/lib/copy_page_64.S | 9 | ||||
| -rw-r--r-- | arch/x86/lib/memmove_64.S | 11 |
2 files changed, 8 insertions, 12 deletions
diff --git a/arch/x86/lib/copy_page_64.S b/arch/x86/lib/copy_page_64.S index 6fec2d1cebe1..01c805ba5359 100644 --- a/arch/x86/lib/copy_page_64.S +++ b/arch/x86/lib/copy_page_64.S @@ -2,6 +2,7 @@ #include <linux/linkage.h> #include <asm/dwarf2.h> +#include <asm/alternative-asm.h> ALIGN copy_page_c: @@ -110,10 +111,6 @@ ENDPROC(copy_page) 2: .previous .section .altinstructions,"a" - .align 8 - .quad copy_page - .quad 1b - .word X86_FEATURE_REP_GOOD - .byte .Lcopy_page_end - copy_page - .byte 2b - 1b + altinstruction_entry copy_page, 1b, X86_FEATURE_REP_GOOD, \ + .Lcopy_page_end-copy_page, 2b-1b .previous diff --git a/arch/x86/lib/memmove_64.S b/arch/x86/lib/memmove_64.S index d0ec9c2936d7..ee164610ec46 100644 --- a/arch/x86/lib/memmove_64.S +++ b/arch/x86/lib/memmove_64.S @@ -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) |