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 * Copyright (c) 2013 ARM Ltd
30 * All rights reserved.
31 *
32 * Redistribution and use in source and binary forms, with or without
33 * modification, are permitted provided that the following conditions
34 * are met:
35 * 1. Redistributions of source code must retain the above copyright
36 *    notice, this list of conditions and the following disclaimer.
37 * 2. Redistributions in binary form must reproduce the above copyright
38 *    notice, this list of conditions and the following disclaimer in the
39 *    documentation and/or other materials provided with the distribution.
40 * 3. The name of the company may not be used to endorse or promote
41 *    products derived from this software without specific prior written
42 *    permission.
43 *
44 * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
45 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
46 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
47 * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
49 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
50 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
51 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
52 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
53 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
54 */
55
56// Prototype: void *memcpy (void *dst, const void *src, size_t count).
57
58#include <private/bionic_asm.h>
59#include <private/libc_events.h>
60
61        .text
62        .syntax unified
63        .fpu    neon
64
65ENTRY(__memcpy_chk)
66        cmp     r2, r3
67        bhi     __memcpy_chk_fail
68
69        // Fall through to memcpy...
70END(__memcpy_chk)
71
72ENTRY(memcpy)
73        pld     [r1, #64]
74        push    {r0, lr}
75        .cfi_def_cfa_offset 8
76        .cfi_rel_offset r0, 0
77        .cfi_rel_offset lr, 4
78END(memcpy)
79
80#define MEMCPY_BASE         __memcpy_base
81#define MEMCPY_BASE_ALIGNED __memcpy_base_aligned
82#include "memcpy_base.S"
83
84ENTRY_PRIVATE(__memcpy_chk_fail)
85        // Preserve lr for backtrace.
86        push    {lr}
87        .cfi_def_cfa_offset 4
88        .cfi_rel_offset lr, 0
89
90        ldr     r0, error_message
91        ldr     r1, error_code
921:
93        add     r0, pc
94        bl      __fortify_chk_fail
95error_code:
96        .word   BIONIC_EVENT_MEMCPY_BUFFER_OVERFLOW
97error_message:
98        .word   error_string-(1b+8)
99END(__memcpy_chk_fail)
100
101        .data
102error_string:
103        .string "memcpy: prevented write past end of buffer"
104