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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#include <private/bionic_asm.h>
30#include <private/libc_events.h>
31
32/*
33 * This code assumes it is running on a processor that supports all arm v7
34 * instructions, that supports neon instructions, and that has a 32 byte
35 * cache line.
36 */
37
38        .syntax unified
39        .fpu    neon
40        .thumb
41        .thumb_func
42
43ENTRY(__memcpy_chk)
44        cmp         r2, r3
45        bhi         __memcpy_chk_fail
46
47        // Fall through to memcpy...
48END(__memcpy_chk)
49
50ENTRY(memcpy)
51        pld     [r1, #0]
52        stmfd   sp!, {r0, lr}
53        .cfi_def_cfa_offset 8
54        .cfi_rel_offset r0, 0
55        .cfi_rel_offset lr, 4
56        pld     [r1, #64]
57END(memcpy)
58
59#define MEMCPY_BASE         __memcpy_base
60#define MEMCPY_BASE_ALIGNED __memcpy_base_aligned
61#include "memcpy_base.S"
62
63ENTRY_PRIVATE(__memcpy_chk_fail)
64        // Preserve lr for backtrace.
65        push    {lr}
66        .cfi_def_cfa_offset 4
67        .cfi_rel_offset lr, 0
68
69        ldr     r0, error_message
70        ldr     r1, error_code
711:
72        add     r0, pc
73        bl      __fortify_chk_fail
74error_code:
75        .word   BIONIC_EVENT_MEMCPY_BUFFER_OVERFLOW
76error_message:
77        .word   error_string-(1b+4)
78END(__memcpy_chk_fail)
79
80        .data
81error_string:
82        .string     "memcpy: prevented write past end of buffer"
83