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
|
/*
* Copyright 2011, 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 "MemChunk.h"
#include "utils/flush_cpu_cache.h"
#include "utils/helper.h"
#include <llvm/Support/raw_ostream.h>
#include <sys/mman.h>
#include <stdlib.h>
#ifndef MAP_32BIT
#define MAP_32BIT 0
// Note: If the <sys/mman.h> does not come with MAP_32BIT, then we
// define it as zero, so that it won't manipulate the flags.
#endif
static uintptr_t StartAddr = 0x7e000000UL;
MemChunk::MemChunk() : buf((unsigned char *)MAP_FAILED), buf_size(0) {
}
MemChunk::~MemChunk() {
if (buf != MAP_FAILED) {
munmap(buf, buf_size);
}
}
bool MemChunk::allocate(size_t size) {
buf = (unsigned char *)mmap((void *)StartAddr, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_32BIT,
-1, 0);
if (buf == MAP_FAILED) {
return false;
}
StartAddr += (size + 4095) / 4096 * 4096;
buf_size = size;
return true;
}
void MemChunk::print() const {
if (buf != MAP_FAILED) {
dump_hex(buf, buf_size, 0, buf_size);
}
}
bool MemChunk::protect(int prot) {
if (buf_size > 0) {
int ret = mprotect((void *)buf, buf_size, prot);
if (ret == -1) {
llvm::errs() << "Error: Can't mprotect.\n";
return false;
}
if (prot & PROT_EXEC) {
FLUSH_CPU_CACHE(buf, buf + buf_size);
}
}
return true;
}
|
