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
|
/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <sys/ptrace.h>
#include <sys/uio.h>
#if defined(__BIONIC__)
#include <bionic/mte.h>
#else
#define mte_supported() false
#endif
#include "MemoryLocal.h"
#include "MemoryRemote.h"
namespace unwindstack {
long MemoryRemote::ReadTag(uint64_t addr) {
#if defined(PTRACE_PEEKMTETAGS) || defined(PT_PEEKMTETAGS)
char tag;
iovec iov = {&tag, 1};
if (ptrace(PTRACE_PEEKMTETAGS, pid_, reinterpret_cast<void*>(addr), &iov) != 0 ||
iov.iov_len != 1) {
return -1;
}
return tag;
#else
(void)addr;
return -1;
#endif
}
long MemoryLocal::ReadTag(uint64_t addr) {
#if defined(__aarch64__)
// Check that the memory is readable first. This is racy with the ldg but there's not much
// we can do about it.
char data;
if (!mte_supported() || !Read(addr, &data, 1)) {
return -1;
}
__asm__ __volatile__(".arch_extension mte; ldg %0, [%0]" : "+r"(addr) : : "memory");
return (addr >> 56) & 0xf;
#else
(void)addr;
return -1;
#endif
}
} // namespace unwindstack
|
