sysdeps/i386/i686/multiarch/memmove.S

   1 /* Multiple versions of memmove
   2    Copyright (C) 2010, 2012 Free Software Foundation, Inc.
   3    Contributed by Intel Corporation.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <sysdep.h>
  22 #include <init-arch.h>
  23
  24 /* Define multiple versions only for the definition in lib.  */
  25 #ifndef NOT_IN_libc
  26 # ifdef SHARED
  27         .text
  28 ENTRY(memmove)
  29         .type   memmove, @gnu_indirect_function
  30         pushl   %ebx
  31         cfi_adjust_cfa_offset (4)
  32         cfi_rel_offset (ebx, 0)
  33         LOAD_PIC_REG(bx)
  34         cmpl    $0, KIND_OFFSET+__cpu_features@GOTOFF(%ebx)
  35         jne     1f
  36         call    __init_cpu_features
  37 1:      leal    __memmove_ia32@GOTOFF(%ebx), %eax
  38         testl   $bit_SSSE3, CPUID_OFFSET+index_SSSE3+__cpu_features@GOTOFF(%ebx)
  39         jz      2f
  40         leal    __memmove_ssse3@GOTOFF(%ebx), %eax
  41         testl   $bit_Fast_Rep_String, FEATURE_OFFSET+index_Fast_Rep_String+__cpu_features@GOTOFF(%ebx)
  42         jz      2f
  43         leal    __memmove_ssse3_rep@GOTOFF(%ebx), %eax
  44 2:      popl    %ebx
  45         cfi_adjust_cfa_offset (-4)
  46         cfi_restore (ebx)
  47         ret
  48 END(memmove)
  49
  50 # undef ENTRY
  51 # define ENTRY(name) \
  52         .type __memmove_ia32, @function; \
  53         .p2align 4; \
  54         __memmove_ia32: cfi_startproc; \
  55         CALL_MCOUNT
  56 # else
  57         .text
  58 ENTRY(memmove)
  59         .type   memmove, @gnu_indirect_function
  60         cmpl    $0, KIND_OFFSET+__cpu_features
  61         jne     1f
  62         call    __init_cpu_features
  63 1:      leal    __memmove_ia32, %eax
  64         testl   $bit_SSSE3, CPUID_OFFSET+index_SSSE3+__cpu_features
  65         jz      2f
  66         leal    __memmove_ssse3, %eax
  67         testl   $bit_Fast_Rep_String, FEATURE_OFFSET+index_Fast_Rep_String+__cpu_features
  68         jz      2f
  69         leal    __memmove_ssse3_rep, %eax
  70 2:      ret
  71 END(memmove)
  72
  73 # undef ENTRY
  74 # define ENTRY(name) \
  75         .type __memmove_ia32, @function; \
  76         .globl __memmove_ia32; \
  77         .p2align 4; \
  78         __memmove_ia32: cfi_startproc; \
  79         CALL_MCOUNT
  80 # endif
  81
  82 # undef END
  83 # define END(name) \
  84         cfi_endproc; .size __memmove_ia32, .-__memmove_ia32
  85
  86 # undef ENTRY_CHK
  87 # define ENTRY_CHK(name) \
  88         .type __memmove_chk_ia32, @function; \
  89         .globl __memmove_chk_ia32; \
  90         .p2align 4; \
  91         __memmove_chk_ia32: cfi_startproc; \
  92         CALL_MCOUNT
  93 # undef END_CHK
  94 # define END_CHK(name) \
  95         cfi_endproc; .size __memmove_chk_ia32, .-__memmove_chk_ia32
  96
  97 # ifdef SHARED
  98 #  undef libc_hidden_builtin_def
  99 /* IFUNC doesn't work with the hidden functions in shared library since
 100    they will be called without setting up EBX needed for PLT which is
 101    used by IFUNC.  */
 102 #  define libc_hidden_builtin_def(name) \
 103         .globl __GI_memmove; __GI_memmove = __memmove_ia32
 104 # endif
 105 #endif
 106
 107 #include "../memmove.S"