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
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/*
* Copyright (C) 2020-2024 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#pragma once
#include "shared/source/device_binary_format/elf/elf.h"
#include "shared/source/device_binary_format/elf/elf_decoder.h"
#include "shared/source/device_binary_format/elf/elf_encoder.h"
#include "shared/source/utilities/arrayref.h"
#include "shared/source/utilities/stackvec.h"
#include <memory>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>
namespace NEO {
namespace Elf {
template <ElfIdentifierClass numBits = NEO::Elf::EI_CLASS_64>
struct MutableSectionHeader {
MutableSectionHeader(const std::string &name, const NEO::Elf::ElfSectionHeader<numBits> &header, const std::vector<uint8_t> &data)
: name(name), header(header), data(data) {
}
std::string name;
NEO::Elf::ElfSectionHeader<numBits> header{};
std::vector<uint8_t> data;
};
template <ElfIdentifierClass numBits = NEO::Elf::EI_CLASS_64>
struct MutableProgramHeader {
MutableProgramHeader(const NEO::Elf::ElfProgramHeader<numBits> &header, const std::vector<uint8_t> &data)
: header(header), data(data) {
}
NEO::Elf::ElfProgramHeader<numBits> header = {};
std::vector<uint8_t> data;
MutableSectionHeader<numBits> *referencedSectionData = nullptr;
};
template <ElfIdentifierClass numBits = NEO::Elf::EI_CLASS_64>
struct ElfRewriter {
using SectionId = uint32_t;
ElfRewriter(NEO::Elf::Elf<numBits> &src) {
elfFileHeader = *src.elfFileHeader;
for (const auto &sh : src.sectionHeaders) {
this->sectionHeaders.push_back(std::make_unique<MutableSectionHeader<numBits>>(src.getName(sh.header->name), *sh.header, std::vector<uint8_t>{sh.data.begin(), sh.data.end()}));
}
for (const auto &ph : src.programHeaders) {
this->programHeaders.push_back(std::make_unique<MutableProgramHeader<numBits>>(*ph.header, std::vector<uint8_t>{ph.data.begin(), ph.data.end()}));
for (const auto &sh : this->sectionHeaders) {
if ((sh->header.offset == ph.header->offset) && (sh->header.size == ph.header->fileSz)) {
(*this->programHeaders.rbegin())->referencedSectionData = sh.get();
}
}
}
}
std::vector<uint8_t> encode() const {
NEO::Elf::ElfEncoder<numBits> encoder{};
for (const auto &sh : this->sectionHeaders) {
if (sh->header.type == SHT_STRTAB) {
encoder.setInitialStringsTab(sh->data);
}
}
encoder.getElfFileHeader() = elfFileHeader;
std::unordered_map<MutableSectionHeader<numBits> *, decltype(NEO::Elf::ElfSectionHeader<numBits>::offset)> encodedSectionsOffsets;
for (const auto &sh : this->sectionHeaders) {
if ((sh->header.type == SHT_NULL) || (sh->header.type == SHT_STRTAB)) {
continue;
}
auto nameIdx = encoder.appendSectionName(sh->name);
NEO::Elf::ElfSectionHeader<numBits> header = sh->header;
header.name = nameIdx;
encodedSectionsOffsets[sh.get()] = encoder.appendSection(header, sh->data).offset;
}
for (const auto &ph : this->programHeaders) {
if (ph->referencedSectionData) {
auto &header = ph->header;
header.offset = encodedSectionsOffsets[ph->referencedSectionData];
encoder.appendSegment(ph->header, {});
} else {
encoder.appendSegment(ph->header, ph->data);
}
}
return encoder.encode();
}
StackVec<SectionId, 16> findSections(typename ElfSectionHeaderTypes<numBits>::Type type, ConstStringRef name) {
StackVec<SectionId, 16> ret;
for (size_t i = 0; i < this->sectionHeaders.size(); i++) {
auto §ion = this->sectionHeaders[i];
if ((type == section->header.type) && (name == section->name)) {
ret.push_back(static_cast<SectionId>(i));
}
}
return ret;
}
MutableSectionHeader<numBits> &getSection(SectionId idx) {
return *sectionHeaders[idx];
}
void removeSection(SectionId idx) {
auto sectionHeaderToRemove = std::move(sectionHeaders[idx]);
for (auto it = idx + 1; it < sectionHeaders.size(); ++it) { // preserve order
sectionHeaders[it - 1] = std::move(sectionHeaders[it]);
}
sectionHeaders.pop_back();
for (auto &programHeader : programHeaders) {
if (sectionHeaderToRemove.get() == programHeader->referencedSectionData) {
programHeader->referencedSectionData = nullptr;
}
}
}
ElfFileHeader<numBits> elfFileHeader = {};
protected:
StackVec<std::unique_ptr<MutableSectionHeader<numBits>>, 32> sectionHeaders;
StackVec<std::unique_ptr<MutableProgramHeader<numBits>>, 32> programHeaders;
};
} // namespace Elf
} // namespace NEO
|
