diff options
Diffstat (limited to 'sysdeps/x86_64/memcpy_chk.S')
| -rw-r--r-- | sysdeps/x86_64/memcpy_chk.S | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/sysdeps/x86_64/memcpy_chk.S b/sysdeps/x86_64/memcpy_chk.S new file mode 100644 index 0000000000..c5251ea2d4 --- /dev/null +++ b/sysdeps/x86_64/memcpy_chk.S @@ -0,0 +1,34 @@ +/* Checking memcpy for x86-64. + Copyright (C) 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> +#include "asm-syntax.h" + +#ifndef PIC + /* For libc.so this is defined in memcpy.S. + For libc.a, this is a separate source to avoid + memcpy bringing in __chk_fail and all routines + it calls. */ + .text +ENTRY (__memcpy_chk) + cmpq %rdx, %rcx + jb __chk_fail + jmp memcpy +END (__memcpy_chk) +#endif |