diff options
Diffstat (limited to 'sysdeps/x86_64/memmove_chk.S')
| -rw-r--r-- | sysdeps/x86_64/memmove_chk.S | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/sysdeps/x86_64/memmove_chk.S b/sysdeps/x86_64/memmove_chk.S new file mode 100644 index 0000000000..ee154f13d2 --- /dev/null +++ b/sysdeps/x86_64/memmove_chk.S @@ -0,0 +1,33 @@ +/* Checking memmove for x86-64. + Copyright (C) 2016 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, see + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> +#include "asm-syntax.h" + +#ifndef SHARED + /* For libc.so this is defined in memmove.S. + For libc.a, this is a separate source to avoid + memmove bringing in __chk_fail and all routines + it calls. */ + .text +ENTRY (__memmove_chk) + cmpq %rdx, %rcx + jb __chk_fail + jmp memmove +END (__memmove_chk) +#endif |