sysdeps/x86_64/multiarch/mempcpy_chk.S

   1 /* Multiple versions of __mempcpy_chk
   2    All versions must be listed in ifunc-impl-list.c.
   3    Copyright (C) 2010-2014 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 /* Define multiple versions only for the definition in lib and for
  25    DSO.  There are no multiarch mempcpy functions for static binaries.
  26  */
  27 #ifndef NOT_IN_libc
  28 # ifdef SHARED
  29         .text
  30 ENTRY(__mempcpy_chk)
  31         .type   __mempcpy_chk, @gnu_indirect_function
  32         cmpl    $0, KIND_OFFSET+__cpu_features(%rip)
  33         jne     1f
  34         call    __init_cpu_features
  35 1:      leaq    __mempcpy_chk_sse2(%rip), %rax
  36         testl   $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip)
  37         jz      2f
  38         leaq    __mempcpy_chk_ssse3(%rip), %rax
  39         testl   $bit_Fast_Copy_Backward, __cpu_features+FEATURE_OFFSET+index_Fast_Copy_Backward(%rip)
  40         jz      2f
  41         leaq    __mempcpy_chk_ssse3_back(%rip), %rax
  42 2:      ret
  43 END(__mempcpy_chk)
  44 # else
  45 #  include "../mempcpy_chk.S"
  46 # endif
  47 #endif