fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / arch / x86_64 / lib / memset.S

diff --git a/arch/x86_64/lib/memset.S b/arch/x86_64/lib/memset.S
index 4b4c406..2c59481 100644 (file)
--- a/arch/x86_64/lib/memset.S
+++ b/arch/x86_64/lib/memset.S
@@ -1,4 +1,8 @@
 /* Copyright 2002 Andi Kleen, SuSE Labs */
+
+#include <linux/linkage.h>
+#include <asm/dwarf2.h>
+
 /*
  * ISO C memset - set a memory block to a byte value.
  *     
@@ -8,11 +12,29 @@
  * 
  * rax   original destination
  */    
-       .globl __memset
-       .globl memset
-       .p2align 4
-memset:        
-__memset:
+       ALIGN
+memset_c:
+       CFI_STARTPROC
+       movq %rdi,%r9
+       movl %edx,%r8d
+       andl $7,%r8d
+       movl %edx,%ecx
+       shrl $3,%ecx
+       /* expand byte value  */
+       movzbl %sil,%esi
+       movabs $0x0101010101010101,%rax
+       mulq %rsi               /* with rax, clobbers rdx */
+       rep stosq
+       movl %r8d,%ecx
+       rep stosb
+       movq %r9,%rax
+       ret
+       CFI_ENDPROC
+ENDPROC(memset_c)
+
+ENTRY(memset)
+ENTRY(__memset)
+       CFI_STARTPROC
        movq %rdi,%r10
        movq %rdx,%r11
 
@@ -22,32 +44,33 @@ __memset:
        mul    %rcx             /* with rax, clobbers rdx */
 
        /* align dst */
-       movl  %edi,%r9d         
-       andl  $7,%r9d   
+       movl  %edi,%r9d
+       andl  $7,%r9d
        jnz  .Lbad_alignment
+       CFI_REMEMBER_STATE
 .Lafter_bad_alignment:
-       
+
        movl %r11d,%ecx
        shrl $6,%ecx
        jz       .Lhandle_tail
 
        .p2align 4
-.Lloop_64:     
+.Lloop_64:
        decl   %ecx
-       movq  %rax,(%rdi) 
-       movq  %rax,8(%rdi) 
-       movq  %rax,16(%rdi) 
-       movq  %rax,24(%rdi) 
-       movq  %rax,32(%rdi) 
-       movq  %rax,40(%rdi) 
-       movq  %rax,48(%rdi) 
-       movq  %rax,56(%rdi) 
+       movq  %rax,(%rdi)
+       movq  %rax,8(%rdi)
+       movq  %rax,16(%rdi)
+       movq  %rax,24(%rdi)
+       movq  %rax,32(%rdi)
+       movq  %rax,40(%rdi)
+       movq  %rax,48(%rdi)
+       movq  %rax,56(%rdi)
        leaq  64(%rdi),%rdi
        jnz    .Lloop_64
 
        /* Handle tail in loops. The loops should be faster than hard
-          to predict jump tables. */ 
-       .p2align 4         
+          to predict jump tables. */
+       .p2align 4
 .Lhandle_tail:
        movl    %r11d,%ecx
        andl    $63&(~7),%ecx
@@ -70,56 +93,41 @@ __memset:
        movb    %al,(%rdi)
        leaq    1(%rdi),%rdi
        jnz     .Lloop_1
-       
-.Lende:        
+
+.Lende:
        movq    %r10,%rax
        ret
 
+       CFI_RESTORE_STATE
 .Lbad_alignment:
        cmpq $7,%r11
        jbe     .Lhandle_7
        movq %rax,(%rdi)        /* unaligned store */
-       movq $8,%r8                     
-       subq %r9,%r8 
+       movq $8,%r8
+       subq %r9,%r8
        addq %r8,%rdi
        subq %r8,%r11
        jmp .Lafter_bad_alignment
+.Lfinal:
+       CFI_ENDPROC
+ENDPROC(memset)
+ENDPROC(__memset)
 
-       /* C stepping K8 run faster using the string instructions.
+       /* Some CPUs run faster using the string instructions.
           It is also a lot simpler. Use this when possible */
 
-#include <asm/cpufeature.h>    
-               
-       .section .altinstructions,"a"
-       .align 8
-       .quad  memset
-       .quad  memset_c
-       .byte  X86_FEATURE_K8_C
-       .byte  memset_c_end-memset_c
-       .byte  memset_c_end-memset_c
-       .previous
+#include <asm/cpufeature.h>
 
        .section .altinstr_replacement,"ax"
- /* rdi        destination
-  * rsi value
-  * rdx count
-  */                   
-memset_c:      
-       movq %rdi,%r9
-       movl %edx,%r8d
-       andl $7,%r8d            
-       movl %edx,%ecx
-       shrl $3,%ecx            
-       /* expand byte value  */
-       movzbl %sil,%esi
-       movabs $0x0101010101010101,%rax
-       mulq   %rsi             /* with rax, clobbers rdx */
-       rep
-       stosq   
-       movl %r8d,%ecx
-       rep
-       stosb
-       movq %r9,%rax
-       ret
-memset_c_end:
+1:     .byte 0xeb                              /* jmp <disp8> */
+       .byte (memset_c - memset) - (2f - 1b)   /* offset */
+2:
+       .previous
+       .section .altinstructions,"a"
+       .align 8
+       .quad memset
+       .quad 1b
+       .byte X86_FEATURE_REP_GOOD
+       .byte .Lfinal - memset
+       .byte 2b - 1b
        .previous