1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29// Prototype: void *memcpy (void *dst, const void *src, size_t count).
30
31#include <private/bionic_asm.h>
32#include <private/libc_events.h>
33
34ENTRY(__memcpy_chk)
35  cmp   x2, x3
36  b.hi  __memcpy_chk_fail
37
38  // Fall through to memcpy...
39END(__memcpy_chk)
40
41ENTRY(memcpy)
42  #include "memcpy_base.S"
43END(memcpy)
44
45ENTRY_PRIVATE(__memcpy_chk_fail)
46  // Preserve for accurate backtrace.
47  stp  x29, x30, [sp, -16]!
48  .cfi_def_cfa_offset 16
49  .cfi_rel_offset x29, 0
50  .cfi_rel_offset x30, 8
51
52  adrp  x0, error_string
53  add   x0, x0, :lo12:error_string
54  ldr   x1, error_code
55  bl    __fortify_chk_fail
56error_code:
57  .word   BIONIC_EVENT_MEMCPY_BUFFER_OVERFLOW
58END(__memcpy_chk_fail)
59
60  .data
61  .align 2
62error_string:
63  .string "memcpy: prevented write past end of buffer"
64