sysdeps/i386/i686/multiarch/memset_chk.S

   1 /* Multiple versions of __memset_chk
   2    Copyright (C) 2010, 2012 Free Software Foundation, Inc.
   3    Contributed by Intel Corporation.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <sysdep.h>
  21 #include <init-arch.h>
  22
  23 /* Define multiple versions only for the definition in lib.  */
  24 #ifndef NOT_IN_libc
  25 # ifdef SHARED
  26         .text
  27 ENTRY(__memset_chk)
  28         .type   __memset_chk, @gnu_indirect_function
  29         pushl   %ebx
  30         cfi_adjust_cfa_offset (4)
  31         cfi_rel_offset (ebx, 0)
  32         LOAD_PIC_REG(bx)
  33         cmpl    $0, KIND_OFFSET+__cpu_features@GOTOFF(%ebx)
  34         jne     1f
  35         call    __init_cpu_features
  36 1:      leal    __memset_chk_ia32@GOTOFF(%ebx), %eax
  37         testl   $bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features@GOTOFF(%ebx)
  38         jz      2f
  39         leal    __memset_chk_sse2@GOTOFF(%ebx), %eax
  40         testl   $bit_Fast_Rep_String, FEATURE_OFFSET+index_Fast_Rep_String+__cpu_features@GOTOFF(%ebx)
  41         jz      2f
  42         leal    __memset_chk_sse2_rep@GOTOFF(%ebx), %eax
  43 2:      popl    %ebx
  44         cfi_adjust_cfa_offset (-4)
  45         cfi_restore (ebx)
  46         ret
  47 END(__memset_chk)
  48
  49 strong_alias (__memset_chk, __memset_zero_constant_len_parameter)
  50         .section .gnu.warning.__memset_zero_constant_len_parameter
  51         .string "memset used with constant zero length parameter; this could be due to transposed parameters"
  52 # else
  53         .text
  54 ENTRY(__memset_chk)
  55         .type   __memset_chk, @gnu_indirect_function
  56         cmpl    $0, KIND_OFFSET+__cpu_features
  57         jne     1f
  58         call    __init_cpu_features
  59 1:      leal    __memset_chk_ia32, %eax
  60         testl   $bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features
  61         jz      2f
  62         leal    __memset_chk_sse2, %eax
  63         testl   $bit_Fast_Rep_String, FEATURE_OFFSET+index_Fast_Rep_String+__cpu_features
  64         jz      2f
  65         leal    __memset_chk_sse2_rep, %eax
  66 2:      ret
  67 END(__memset_chk)
  68
  69         .type __memset_chk_sse2, @function
  70         .p2align 4;
  71 __memset_chk_sse2:
  72         cfi_startproc
  73         CALL_MCOUNT
  74         movl    12(%esp), %eax
  75         cmpl    %eax, 16(%esp)
  76         jb      __chk_fail
  77         jmp     __memset_sse2
  78         cfi_endproc
  79         .size __memset_chk_sse2, .-__memset_chk_sse2
  80
  81         .type __memset_chk_sse2_rep, @function
  82         .p2align 4;
  83 __memset_chk_sse2_rep:
  84         cfi_startproc
  85         CALL_MCOUNT
  86         movl    12(%esp), %eax
  87         cmpl    %eax, 16(%esp)
  88         jb      __chk_fail
  89         jmp     __memset_sse2_rep
  90         cfi_endproc
  91         .size __memset_chk_sse2_rep, .-__memset_chk_sse2_rep
  92
  93         .type __memset_chk_ia32, @function
  94         .p2align 4;
  95 __memset_chk_ia32:
  96         cfi_startproc
  97         CALL_MCOUNT
  98         movl    12(%esp), %eax
  99         cmpl    %eax, 16(%esp)
 100         jb      __chk_fail
 101         jmp     __memset_ia32
 102         cfi_endproc
 103         .size __memset_chk_ia32, .-__memset_chk_ia32
 104 # endif
 105 #endif