sysdeps/i386/i686/multiarch/memset_chk.S

   1 /* Multiple versions of __memset_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.  */
  25 #ifndef NOT_IN_libc
  26 # ifdef SHARED
  27         .text
  28 ENTRY(__memset_chk)
  29         .type   __memset_chk, @gnu_indirect_function
  30         pushl   %ebx
  31         cfi_adjust_cfa_offset (4)
  32         cfi_rel_offset (ebx, 0)
  33         LOAD_PIC_REG(bx)
  34         cmpl    $0, KIND_OFFSET+__cpu_features@GOTOFF(%ebx)
  35         jne     1f
  36         call    __init_cpu_features
  37 1:      leal    __memset_chk_ia32@GOTOFF(%ebx), %eax
  38         testl   $bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features@GOTOFF(%ebx)
  39         jz      2f
  40         leal    __memset_chk_sse2@GOTOFF(%ebx), %eax
  41         testl   $bit_Fast_Rep_String, FEATURE_OFFSET+index_Fast_Rep_String+__cpu_features@GOTOFF(%ebx)
  42         jz      2f
  43         leal    __memset_chk_sse2_rep@GOTOFF(%ebx), %eax
  44 2:      popl    %ebx
  45         cfi_adjust_cfa_offset (-4)
  46         cfi_restore (ebx)
  47         ret
  48 END(__memset_chk)
  49
  50 strong_alias (__memset_chk, __memset_zero_constant_len_parameter)
  51         .section .gnu.warning.__memset_zero_constant_len_parameter
  52         .string "memset used with constant zero length parameter; this could be due to transposed parameters"
  53 # else
  54         .text
  55 ENTRY(__memset_chk)
  56         .type   __memset_chk, @gnu_indirect_function
  57         cmpl    $0, KIND_OFFSET+__cpu_features
  58         jne     1f
  59         call    __init_cpu_features
  60 1:      leal    __memset_chk_ia32, %eax
  61         testl   $bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features
  62         jz      2f
  63         leal    __memset_chk_sse2, %eax
  64         testl   $bit_Fast_Rep_String, FEATURE_OFFSET+index_Fast_Rep_String+__cpu_features
  65         jz      2f
  66         leal    __memset_chk_sse2_rep, %eax
  67 2:      ret
  68 END(__memset_chk)
  69
  70         .type __memset_chk_sse2, @function
  71         .p2align 4;
  72 __memset_chk_sse2:
  73         cfi_startproc
  74         CALL_MCOUNT
  75         movl    12(%esp), %eax
  76         cmpl    %eax, 16(%esp)
  77         jb      __chk_fail
  78         jmp     __memset_sse2
  79         cfi_endproc
  80         .size __memset_chk_sse2, .-__memset_chk_sse2
  81
  82         .type __memset_chk_sse2_rep, @function
  83         .p2align 4;
  84 __memset_chk_sse2_rep:
  85         cfi_startproc
  86         CALL_MCOUNT
  87         movl    12(%esp), %eax
  88         cmpl    %eax, 16(%esp)
  89         jb      __chk_fail
  90         jmp     __memset_sse2_rep
  91         cfi_endproc
  92         .size __memset_chk_sse2_rep, .-__memset_chk_sse2_rep
  93
  94         .type __memset_chk_ia32, @function
  95         .p2align 4;
  96 __memset_chk_ia32:
  97         cfi_startproc
  98         CALL_MCOUNT
  99         movl    12(%esp), %eax
 100         cmpl    %eax, 16(%esp)
 101         jb      __chk_fail
 102         jmp     __memset_ia32
 103         cfi_endproc
 104         .size __memset_chk_ia32, .-__memset_chk_ia32
 105 # endif
 106 #endif