sysdeps/i386/i686/multiarch/mempcpy.S

   1 /* Multiple versions of mempcpy
   2    All versions must be listed in ifunc-impl-list.c.
   3    Copyright (C) 2010-2015 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 /* Define multiple versions only for the definition in lib and for
  25    DSO.  In static binaries we need mempcpy before the initialization
  26    happened.  */
  27 #if defined SHARED && IS_IN (libc)
  28         .text
  29 ENTRY(__mempcpy)
  30         .type   __mempcpy, @gnu_indirect_function
  31         pushl   %ebx
  32         cfi_adjust_cfa_offset (4)
  33         cfi_rel_offset (ebx, 0)
  34         LOAD_PIC_REG(bx)
  35         cmpl    $0, KIND_OFFSET+__cpu_features@GOTOFF(%ebx)
  36         jne     1f
  37         call    __init_cpu_features
  38 1:      leal    __mempcpy_ia32@GOTOFF(%ebx), %eax
  39         testl   $bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features@GOTOFF(%ebx)
  40         jz      2f
  41         leal    __mempcpy_sse2_unaligned@GOTOFF(%ebx), %eax
  42         testl   $bit_Fast_Unaligned_Load, FEATURE_OFFSET+index_Fast_Unaligned_Load+__cpu_features@GOTOFF(%ebx)
  43         jnz     2f
  44         testl   $bit_SSSE3, CPUID_OFFSET+index_SSSE3+__cpu_features@GOTOFF(%ebx)
  45         jz      2f
  46         leal    __mempcpy_ssse3@GOTOFF(%ebx), %eax
  47         testl   $bit_Fast_Rep_String, FEATURE_OFFSET+index_Fast_Rep_String+__cpu_features@GOTOFF(%ebx)
  48         jz      2f
  49         leal    __mempcpy_ssse3_rep@GOTOFF(%ebx), %eax
  50 2:      popl    %ebx
  51         cfi_adjust_cfa_offset (-4)
  52         cfi_restore (ebx)
  53         ret
  54 END(__mempcpy)
  55
  56 # undef ENTRY
  57 # define ENTRY(name) \
  58         .type __mempcpy_ia32, @function; \
  59         .p2align 4; \
  60         .globl __mempcpy_ia32; \
  61         .hidden __mempcpy_ia32; \
  62         __mempcpy_ia32: cfi_startproc; \
  63         CALL_MCOUNT
  64 # undef END
  65 # define END(name) \
  66         cfi_endproc; .size __mempcpy_ia32, .-__mempcpy_ia32
  67
  68 # undef ENTRY_CHK
  69 # define ENTRY_CHK(name) \
  70         .type __mempcpy_chk_ia32, @function; \
  71         .globl __mempcpy_chk_ia32; \
  72         .p2align 4; \
  73         __mempcpy_chk_ia32: cfi_startproc; \
  74         CALL_MCOUNT
  75 # undef END_CHK
  76 # define END_CHK(name) \
  77         cfi_endproc; .size __mempcpy_chk_ia32, .-__mempcpy_chk_ia32
  78
  79 # undef libc_hidden_def
  80 # undef libc_hidden_builtin_def
  81 /* IFUNC doesn't work with the hidden functions in shared library since
  82    they will be called without setting up EBX needed for PLT which is
  83    used by IFUNC.  */
  84 # define libc_hidden_def(name) \
  85         .globl __GI_mempcpy; __GI_mempcpy = __mempcpy_ia32
  86 # define libc_hidden_builtin_def(name) \
  87         .globl __GI___mempcpy; __GI___mempcpy = __mempcpy_ia32
  88 #endif
  89
  90 #include "../mempcpy.S"