sysdeps/i386/i686/multiarch/bzero.S

   1 /* Multiple versions of bzero
   2    All versions must be listed in ifunc-impl-list.c.
   3    Copyright (C) 2010-2017 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(__bzero)
  28         .type   __bzero, @gnu_indirect_function
  29         LOAD_GOT_AND_RTLD_GLOBAL_RO
  30         LOAD_FUNC_GOT_EAX (__bzero_ia32)
  31         HAS_CPU_FEATURE (SSE2)
  32         jz      2f
  33         LOAD_FUNC_GOT_EAX ( __bzero_sse2)
  34         HAS_ARCH_FEATURE (Fast_Rep_String)
  35         jz      2f
  36         LOAD_FUNC_GOT_EAX (__bzero_sse2_rep)
  37 2:      ret
  38 END(__bzero)
  39
  40 # undef ENTRY
  41 # define ENTRY(name) \
  42         .type __bzero_ia32, @function; \
  43         .p2align 4; \
  44         .globl __bzero_ia32; \
  45         .hidden __bzero_ia32; \
  46         __bzero_ia32: cfi_startproc; \
  47         CALL_MCOUNT
  48 # undef END
  49 # define END(name) \
  50         cfi_endproc; .size __bzero_ia32, .-__bzero_ia32
  51
  52 # ifdef SHARED
  53 #  undef libc_hidden_builtin_def
  54 /* IFUNC doesn't work with the hidden functions in shared library since
  55    they will be called without setting up EBX needed for PLT which is
  56    used by IFUNC.  */
  57 #  define libc_hidden_builtin_def(name) \
  58         .globl __GI___bzero; __GI___bzero = __bzero_ia32
  59 # endif
  60 #endif
  61
  62 #include "../bzero.S"