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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
| //===- lib/FileFormat/MachO/ArchHandler.cpp -------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "ArchHandler.h"
#include "Atoms.h"
#include "MachONormalizedFileBinaryUtils.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm::MachO;
using namespace lld::mach_o::normalized;
namespace lld {
namespace mach_o {
ArchHandler::ArchHandler() {
}
ArchHandler::~ArchHandler() {
}
std::unique_ptr<mach_o::ArchHandler> ArchHandler::create(
MachOLinkingContext::Arch arch) {
switch (arch) {
case MachOLinkingContext::arch_x86_64:
return create_x86_64();
case MachOLinkingContext::arch_x86:
return create_x86();
case MachOLinkingContext::arch_armv6:
case MachOLinkingContext::arch_armv7:
case MachOLinkingContext::arch_armv7s:
return create_arm();
case MachOLinkingContext::arch_arm64:
return create_arm64();
default:
llvm_unreachable("Unknown arch");
}
}
bool ArchHandler::isLazyPointer(const Reference &ref) {
// A lazy bind entry is needed for a lazy pointer.
const StubInfo &info = stubInfo();
if (ref.kindNamespace() != Reference::KindNamespace::mach_o)
return false;
if (ref.kindArch() != info.lazyPointerReferenceToFinal.arch)
return false;
return (ref.kindValue() == info.lazyPointerReferenceToFinal.kind);
}
ArchHandler::RelocPattern ArchHandler::relocPattern(const Relocation &reloc) {
assert((reloc.type & 0xFFF0) == 0);
uint16_t result = reloc.type;
if (reloc.scattered)
result |= rScattered;
if (reloc.pcRel)
result |= rPcRel;
if (reloc.isExtern)
result |= rExtern;
switch(reloc.length) {
case 0:
break;
case 1:
result |= rLength2;
break;
case 2:
result |= rLength4;
break;
case 3:
result |= rLength8;
break;
default:
llvm_unreachable("bad r_length");
}
return result;
}
normalized::Relocation
ArchHandler::relocFromPattern(ArchHandler::RelocPattern pattern) {
normalized::Relocation result;
result.offset = 0;
result.scattered = (pattern & rScattered);
result.type = (RelocationInfoType)(pattern & 0xF);
result.pcRel = (pattern & rPcRel);
result.isExtern = (pattern & rExtern);
result.value = 0;
result.symbol = 0;
switch (pattern & 0x300) {
case rLength1:
result.length = 0;
break;
case rLength2:
result.length = 1;
break;
case rLength4:
result.length = 2;
break;
case rLength8:
result.length = 3;
break;
}
return result;
}
void ArchHandler::appendReloc(normalized::Relocations &relocs, uint32_t offset,
uint32_t symbol, uint32_t value,
RelocPattern pattern) {
normalized::Relocation reloc = relocFromPattern(pattern);
reloc.offset = offset;
reloc.symbol = symbol;
reloc.value = value;
relocs.push_back(reloc);
}
int16_t ArchHandler::readS16(const uint8_t *addr, bool isBig) {
return read16(addr, isBig);
}
int32_t ArchHandler::readS32(const uint8_t *addr, bool isBig) {
return read32(addr, isBig);
}
uint32_t ArchHandler::readU32(const uint8_t *addr, bool isBig) {
return read32(addr, isBig);
}
int64_t ArchHandler::readS64(const uint8_t *addr, bool isBig) {
return read64(addr, isBig);
}
bool ArchHandler::isDwarfCIE(bool isBig, const DefinedAtom *atom) {
assert(atom->contentType() == DefinedAtom::typeCFI);
if (atom->rawContent().size() < sizeof(uint32_t))
return false;
uint32_t size = read32(atom->rawContent().data(), isBig);
uint32_t idOffset = sizeof(uint32_t);
if (size == 0xffffffffU)
idOffset += sizeof(uint64_t);
return read32(atom->rawContent().data() + idOffset, isBig) == 0;
}
const Atom *ArchHandler::fdeTargetFunction(const DefinedAtom *fde) {
for (auto ref : *fde) {
if (ref->kindNamespace() == Reference::KindNamespace::mach_o &&
ref->kindValue() == unwindRefToFunctionKind()) {
assert(ref->kindArch() == kindArch() && "unexpected Reference arch");
return ref->target();
}
}
return nullptr;
}
} // namespace mach_o
} // namespace lld
|