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| author | Borislav Petkov <bp@suse.de> | 2015-02-04 09:11:17 +0100 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2015-02-23 13:54:14 +0100 |
| commit | a77600cd03a44e54df99ea742e02f4899b82c8e1 (patch) | |
| tree | e2567d4005ac6416691d666a1721e9cd01fbeafa /arch/x86/lib/memmove_64.S | |
| parent | 84d95ad4cb9015ea953bf14cea05ba371d4d42bb (diff) | |
| download | linux-a77600cd03a44e54df99ea742e02f4899b82c8e1.tar.bz2 | |
x86/lib/memmove_64.S: Convert memmove() to ALTERNATIVE macro
Make it execute the ERMS version if support is present and we're in the
forward memmove() part and remove the unfolded alternatives section
definition.
Signed-off-by: Borislav Petkov <bp@suse.de>
Diffstat (limited to 'arch/x86/lib/memmove_64.S')
| -rw-r--r-- | arch/x86/lib/memmove_64.S | 19 |
1 files changed, 2 insertions, 17 deletions
diff --git a/arch/x86/lib/memmove_64.S b/arch/x86/lib/memmove_64.S index bbfa6b269ece..0f8a0d0331b9 100644 --- a/arch/x86/lib/memmove_64.S +++ b/arch/x86/lib/memmove_64.S @@ -5,7 +5,6 @@ * This assembly file is re-written from memmove_64.c file. * - Copyright 2011 Fenghua Yu <fenghua.yu@intel.com> */ -#define _STRING_C #include <linux/linkage.h> #include <asm/dwarf2.h> #include <asm/cpufeature.h> @@ -44,6 +43,8 @@ ENTRY(__memmove) jg 2f .Lmemmove_begin_forward: + ALTERNATIVE "", "movq %rdx, %rcx; rep movsb; retq", X86_FEATURE_ERMS + /* * movsq instruction have many startup latency * so we handle small size by general register. @@ -207,21 +208,5 @@ ENTRY(__memmove) 13: retq CFI_ENDPROC - - .section .altinstr_replacement,"ax" -.Lmemmove_begin_forward_efs: - /* Forward moving data. */ - movq %rdx, %rcx - rep movsb - retq -.Lmemmove_end_forward_efs: - .previous - - .section .altinstructions,"a" - 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,0 - .previous ENDPROC(__memmove) ENDPROC(memmove) |