1 /*
2 * Copyright (c) 2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "ecmascript/platform/map.h"
17
18 #include <cerrno>
19 #include <sys/mman.h>
20 #include <unistd.h>
21
22 #include "ecmascript/log_wrapper.h"
23 #include "ecmascript/mem/mem.h"
24 #include "ecmascript/platform/os.h"
25
26 namespace panda::ecmascript {
PageMap(size_t size,int prot,size_t alignment)27 MemMap PageMap(size_t size, int prot, size_t alignment)
28 {
29 ASSERT(size == AlignUp(size, PageSize()));
30 ASSERT(alignment == AlignUp(alignment, PageSize()));
31 size_t allocSize = size + alignment;
32 void *result = mmap(nullptr, allocSize, prot, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
33 if (reinterpret_cast<intptr_t>(result) == -1) {
34 LOG_ECMA(FATAL) << "mmap failed with error code:" << errno;
35 }
36 if (alignment != 0) {
37 auto alignResult = AlignUp(reinterpret_cast<uintptr_t>(result), alignment);
38 size_t leftSize = alignResult - reinterpret_cast<uintptr_t>(result);
39 size_t rightSize = alignment - leftSize;
40 void *alignEndResult = reinterpret_cast<void *>(alignResult + size);
41 munmap(result, leftSize);
42 munmap(alignEndResult, rightSize);
43 result = reinterpret_cast<void *>(alignResult);
44 }
45 return MemMap(result, size);
46 }
47
PageUnmap(MemMap it)48 void PageUnmap(MemMap it)
49 {
50 munmap(it.GetMem(), it.GetSize());
51 }
52
MachineCodePageMap(size_t size,int prot,size_t alignment)53 MemMap MachineCodePageMap(size_t size, int prot, size_t alignment)
54 {
55 MemMap memMap = PageMap(size, prot, alignment);
56 PageTag(memMap.GetMem(), memMap.GetSize(), PageTagType::MACHINE_CODE);
57 return memMap;
58 }
59
MachineCodePageUnmap(MemMap it)60 void MachineCodePageUnmap(MemMap it)
61 {
62 PageClearTag(it.GetMem(), it.GetSize());
63 PageProtect(it.GetMem(), it.GetSize(), PAGE_PROT_NONE);
64 PageUnmap(it);
65 }
66
PageRelease(void * mem,size_t size)67 void PageRelease(void *mem, size_t size)
68 {
69 madvise(mem, size, MADV_DONTNEED);
70 }
71
PagePreRead(void * mem,size_t size)72 void PagePreRead(void *mem, size_t size)
73 {
74 madvise(mem, size, MADV_WILLNEED);
75 }
76
PageTag(void * mem,size_t size,PageTagType type)77 void PageTag(void *mem, size_t size, PageTagType type)
78 {
79 const char *tag = GetPageTagString(type);
80 PrctlSetVMA(mem, size, tag);
81 }
82
PageClearTag(void * mem,size_t size)83 void PageClearTag(void *mem, size_t size)
84 {
85 PrctlSetVMA(mem, size, nullptr);
86 }
87
PageProtect(void * mem,size_t size,int prot)88 void PageProtect(void *mem, size_t size, int prot)
89 {
90 int ret = mprotect(mem, size, prot);
91 if (ret != 0) {
92 LOG_ECMA(ERROR) << "PageProtect change to " << prot << " failed, error code is " << errno;
93 }
94 }
95
PageSize()96 size_t PageSize()
97 {
98 return getpagesize();
99 }
100 } // namespace panda::ecmascript
101