sysdeps/i386/i686/multiarch/strcpy.S

   1 /* Multiple versions of strcpy
   2    All versions must be listed in ifunc-impl-list.c.
   3    Copyright (C) 2011-2015 Free Software Foundation, Inc.
   4    Contributed by Intel Corporation.
   5    This file is part of the GNU C Library.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <sysdep.h>
  22 #include <init-arch.h>
  23
  24 #if !defined (USE_AS_STPCPY) && !defined (USE_AS_STRNCPY)
  25 # ifndef STRCPY
  26 #  define STRCPY strcpy
  27 # endif
  28 #endif
  29
  30 #ifdef USE_AS_STPCPY
  31 # ifdef USE_AS_STRNCPY
  32 #  define STRCPY_SSSE3  __stpncpy_ssse3
  33 #  define STRCPY_SSE2           __stpncpy_sse2
  34 #  define STRCPY_IA32           __stpncpy_ia32
  35 #  define __GI_STRCPY           __GI_stpncpy
  36 #  define __GI___STRCPY         __GI___stpncpy
  37 # else
  38 #  define STRCPY_SSSE3  __stpcpy_ssse3
  39 #  define STRCPY_SSE2           __stpcpy_sse2
  40 #  define STRCPY_IA32           __stpcpy_ia32
  41 #  define __GI_STRCPY           __GI_stpcpy
  42 #  define __GI___STRCPY         __GI___stpcpy
  43 # endif
  44 #else
  45 # ifdef USE_AS_STRNCPY
  46 #  define STRCPY_SSSE3  __strncpy_ssse3
  47 #  define STRCPY_SSE2           __strncpy_sse2
  48 #  define STRCPY_IA32           __strncpy_ia32
  49 #  define __GI_STRCPY           __GI_strncpy
  50 # else
  51 #  define STRCPY_SSSE3  __strcpy_ssse3
  52 #  define STRCPY_SSE2           __strcpy_sse2
  53 #  define STRCPY_IA32           __strcpy_ia32
  54 #  define __GI_STRCPY           __GI_strcpy
  55 # endif
  56 #endif
  57
  58
  59 /* Define multiple versions only for the definition in libc.  Don't
  60    define multiple versions for strncpy in static library since we
  61    need strncpy before the initialization happened.  */
  62 #if IS_IN (libc)
  63
  64 # ifdef SHARED
  65         .text
  66 ENTRY(STRCPY)
  67         .type   STRCPY, @gnu_indirect_function
  68         pushl   %ebx
  69         cfi_adjust_cfa_offset (4)
  70         cfi_rel_offset (ebx, 0)
  71         LOAD_PIC_REG(bx)
  72         cmpl    $0, KIND_OFFSET+__cpu_features@GOTOFF(%ebx)
  73         jne     1f
  74         call    __init_cpu_features
  75 1:      leal    STRCPY_IA32@GOTOFF(%ebx), %eax
  76         testl   $bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features@GOTOFF(%ebx)
  77         jz      2f
  78         leal    STRCPY_SSE2@GOTOFF(%ebx), %eax
  79         testl   $bit_Fast_Unaligned_Load, FEATURE_OFFSET+index_Fast_Unaligned_Load+__cpu_features@GOTOFF(%ebx)
  80         jnz     2f
  81         testl   $bit_SSSE3, CPUID_OFFSET+index_SSSE3+__cpu_features@GOTOFF(%ebx)
  82         jz      2f
  83         leal    STRCPY_SSSE3@GOTOFF(%ebx), %eax
  84 2:      popl    %ebx
  85         cfi_adjust_cfa_offset (-4)
  86         cfi_restore (ebx)
  87         ret
  88 END(STRCPY)
  89 # else
  90
  91 ENTRY(STRCPY)
  92         .type   STRCPY, @gnu_indirect_function
  93         cmpl    $0, KIND_OFFSET+__cpu_features
  94         jne     1f
  95         call    __init_cpu_features
  96 1:      leal    STRCPY_IA32, %eax
  97         testl   $bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features
  98         jz      2f
  99         leal    STRCPY_SSE2, %eax
 100         testl   $bit_Fast_Unaligned_Load, FEATURE_OFFSET+index_Fast_Unaligned_Load+__cpu_features
 101         jnz     2f
 102         testl   $bit_SSSE3, CPUID_OFFSET+index_SSSE3+__cpu_features
 103         jz      2f
 104         leal    STRCPY_SSSE3, %eax
 105 2:      ret
 106 END(STRCPY)
 107
 108 # endif
 109
 110 # undef ENTRY
 111 # define ENTRY(name) \
 112         .type STRCPY_IA32, @function; \
 113         .align 16; \
 114         .globl STRCPY_IA32; \
 115         .hidden STRCPY_IA32; \
 116         STRCPY_IA32: cfi_startproc; \
 117         CALL_MCOUNT
 118 # undef END
 119 # define END(name) \
 120         cfi_endproc; .size STRCPY_IA32, .-STRCPY_IA32
 121
 122 # ifdef SHARED
 123 #  undef libc_hidden_builtin_def
 124 /* It doesn't make sense to send libc-internal strcpy calls through a PLT.
 125    The speedup we get from using SSSE3 instruction is likely eaten away
 126    by the indirect call in the PLT.  */
 127 #  define libc_hidden_builtin_def(name) \
 128         .globl __GI_STRCPY; __GI_STRCPY = STRCPY_IA32
 129 #  undef libc_hidden_def
 130 #  define libc_hidden_def(name) \
 131         .globl __GI___STRCPY; __GI___STRCPY = STRCPY_IA32
 132
 133 # endif
 134 #endif
 135
 136 #ifdef USE_AS_STPCPY
 137 # ifdef USE_AS_STRNCPY
 138 #  include "../../stpncpy.S"
 139 # else
 140 #  include "../../i586/stpcpy.S"
 141 # endif
 142 #else
 143 # ifndef USE_AS_STRNCPY
 144 #  include "../../i586/strcpy.S"
 145 # endif
 146 #endif