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Viewing changes to arch/x86/lib/memmove_64.S

  • Committer: Package Import Robot
  • Author(s): John Rigby, John Rigby
  • Date: 2011-09-26 10:44:23 UTC
  • Revision ID: package-import@ubuntu.com-20110926104423-3o58a3c1bj7x00rs
Tags: 3.0.0-1007.9
https://launchpad.net/bugs/826021
[ John Rigby ]

Enable crypto modules and remove crypto-modules from
exclude-module files
LP: #826021

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Lines of Context:
arch/x86/lib/memmove_64.S
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#define _STRING_C
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#include <linux/linkage.h>
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#include <asm/dwarf2.h>
 
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#include <asm/cpufeature.h>
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#undef memmove
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 */
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ENTRY(memmove)
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        CFI_STARTPROC
 
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        /* Handle more 32bytes in loop */
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        mov %rdi, %rax
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        cmp $0x20, %rdx
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        /* Decide forward/backward copy mode */
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        cmp %rdi, %rsi
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        jb      2f
 
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        jge .Lmemmove_begin_forward
 
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        mov %rsi, %r8
 
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        add %rdx, %r8
 
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        cmp %rdi, %r8
 
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        jg 2f
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.Lmemmove_begin_forward:
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        /*
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         * movsq instruction have many startup latency
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         * so we handle small size by general register.
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        rep movsq
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        movq %r11, (%r10)
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        jmp 13f
 
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.Lmemmove_end_forward:
 
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        /*
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         * Handle data backward by movsq.
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         */
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        retq
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        CFI_ENDPROC
 
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        .section .altinstr_replacement,"ax"
 
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.Lmemmove_begin_forward_efs:
 
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        /* Forward moving data. */
 
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        movq %rdx, %rcx
 
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        rep movsb
 
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        retq
 
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.Lmemmove_end_forward_efs:
 
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        .previous
 
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        .section .altinstructions,"a"
 
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        .align 8
 
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        .quad .Lmemmove_begin_forward
 
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        .quad .Lmemmove_begin_forward_efs
 
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        .word X86_FEATURE_ERMS
 
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        .byte .Lmemmove_end_forward-.Lmemmove_begin_forward
 
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        .byte .Lmemmove_end_forward_efs-.Lmemmove_begin_forward_efs
 
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        .previous
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ENDPROC(memmove)