sysdeps/x86_64/memset_chk.S

   1 /* Checking memset for x86-64.
   2    Copyright (C) 2004, 2005 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <sysdep.h>
  21 #include "asm-syntax.h"
  22
  23 #ifndef PIC
  24         /* For libc.so this is defined in memset.S.
  25            For libc.a, this is a separate source to avoid
  26            memset bringing in __chk_fail and all routines
  27            it calls.  */
  28         .text
  29 ENTRY (__memset_chk)
  30         cmpq    %rdx, %rcx
  31         jb      __chk_fail
  32         jmp     memset
  33 END (__memset_chk)
  34 #endif