1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
/*
* Copyright (C) 2013 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/* Assumes neon instructions and a cache line size of 32 bytes. */
#include <private/bionic_asm.h>
#include <private/libc_events.h>
/*
* This code assumes it is running on a processor that supports all arm v7
* instructions, that supports neon instructions, and that has a 32 byte
* cache line.
*/
.text
.syntax unified
.fpu neon
.thumb
.thumb_func
ENTRY(__memcpy_chk)
cmp r2, r3
bhi __memcpy_chk_fail
// Fall through to memcpy...
END(__memcpy_chk)
ENTRY(memcpy)
pld [r1, #64]
stmfd sp!, {r0, lr}
.save {r0, lr}
.cfi_def_cfa_offset 8
.cfi_rel_offset r0, 0
.cfi_rel_offset lr, 4
END(memcpy)
#define MEMCPY_BASE __memcpy_base
#define MEMCPY_BASE_ALIGNED __memcpy_base_aligned
#include "memcpy_base.S"
ENTRY_PRIVATE(__memcpy_chk_fail)
// Preserve lr for backtrace.
push {lr}
.save {lr}
.cfi_def_cfa_offset 4
.cfi_rel_offset lr, 0
ldr r0, error_message
ldr r1, error_code
1:
add r0, pc
bl __fortify_chk_fail
error_code:
.word BIONIC_EVENT_MEMCPY_BUFFER_OVERFLOW
error_message:
.word error_string-(1b+4)
END(__memcpy_chk_fail)
.data
error_string:
.string "memcpy: prevented write past end of buffer"
|
