1/* Checking memcpy for x86-64.
2 Copyright (C) 2004-2020 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, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <sysdep.h>
20#include "asm-syntax.h"
21
22#ifndef SHARED
23 /* For libc.so this is defined in memcpy.S.
24 For libc.a, this is a separate source to avoid
25 memcpy bringing in __chk_fail and all routines
26 it calls. */
27 .text
28ENTRY (__memcpy_chk)
29 cmpq %rdx, %rcx
30 jb __chk_fail
31 jmp memcpy
32END (__memcpy_chk)
33#endif
34