sysdeps/i386/i686/multiarch/memmove.S

   1 /* Multiple versions of memmove
   2    All versions must be listed in ifunc-impl-list.c.
   3    Copyright (C) 2010-2016 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.  */
  25 #if IS_IN (libc)
  26         .text
  27 ENTRY(memmove)
  28         .type   memmove, @gnu_indirect_function
  29         LOAD_GOT_AND_RTLD_GLOBAL_RO
  30         LOAD_FUNC_GOT_EAX (__memmove_ia32)
  31         HAS_CPU_FEATURE (SSE2)
  32         jz      2f
  33         LOAD_FUNC_GOT_EAX (__memmove_sse2_unaligned)
  34         HAS_ARCH_FEATURE (Fast_Unaligned_Load)
  35         jnz     2f
  36         HAS_CPU_FEATURE (SSSE3)
  37         jz      2f
  38         LOAD_FUNC_GOT_EAX (__memmove_ssse3)
  39         HAS_ARCH_FEATURE (Fast_Rep_String)
  40         jz      2f
  41         LOAD_FUNC_GOT_EAX (__memmove_ssse3_rep)
  42 2:      ret
  43 END(memmove)
  44
  45 # ifdef SHARED
  46 #  undef ENTRY
  47 #  define ENTRY(name) \
  48         .type __memmove_ia32, @function; \
  49         .p2align 4; \
  50         .globl __memmove_ia32; \
  51         .hidden __memmove_ia32; \
  52         __memmove_ia32: cfi_startproc; \
  53         CALL_MCOUNT
  54 # else
  55 #  undef ENTRY
  56 #  define ENTRY(name) \
  57         .type __memmove_ia32, @function; \
  58         .globl __memmove_ia32; \
  59         .p2align 4; \
  60         __memmove_ia32: cfi_startproc; \
  61         CALL_MCOUNT
  62 # endif
  63
  64 # undef END
  65 # define END(name) \
  66         cfi_endproc; .size __memmove_ia32, .-__memmove_ia32
  67
  68 # undef ENTRY_CHK
  69 # define ENTRY_CHK(name) \
  70         .type __memmove_chk_ia32, @function; \
  71         .globl __memmove_chk_ia32; \
  72         .p2align 4; \
  73         __memmove_chk_ia32: cfi_startproc; \
  74         CALL_MCOUNT
  75 # undef END_CHK
  76 # define END_CHK(name) \
  77         cfi_endproc; .size __memmove_chk_ia32, .-__memmove_chk_ia32
  78
  79 # ifdef SHARED
  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_builtin_def(name) \
  85         .globl __GI_memmove; __GI_memmove = __memmove_ia32
  86 # endif
  87 #endif
  88
  89 #include "../memmove.S"