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
172
173
174
175
176
177
178
179
180
|
//===- Platforms/Darwin/DarwinPlatform.cpp --------------------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "DarwinPlatform.h"
#include "MachOFormat.hpp"
#include "StubAtoms.hpp"
#include "ExecutableAtoms.hpp"
#include "DarwinReferenceKinds.h"
#include "ExecutableWriter.h"
#include "lld/Core/DefinedAtom.h"
#include "lld/Core/File.h"
#include "lld/Core/Reference.h"
#include "lld/Core/InputFiles.h"
#include "llvm/Support/ErrorHandling.h"
namespace lld {
Platform *createDarwinPlatform() {
return new darwin::DarwinPlatform();
}
namespace darwin {
DarwinPlatform::DarwinPlatform()
: _helperCommonAtom(nullptr), _cRuntimeFile(nullptr) {
}
void DarwinPlatform::addFiles(InputFiles &inputFiles) {
_cRuntimeFile = new CRuntimeFile();
inputFiles.prependFile(*_cRuntimeFile);
}
Reference::Kind DarwinPlatform::kindFromString(StringRef kindName) {
return ReferenceKind::fromString(kindName);
}
StringRef DarwinPlatform::kindToString(Reference::Kind kindValue) {
return ReferenceKind::toString(kindValue);
}
bool DarwinPlatform::noTextRelocs() {
return true;
}
bool DarwinPlatform::isCallSite(Reference::Kind kind) {
return ReferenceKind::isCallSite(kind);
}
bool DarwinPlatform::isGOTAccess(Reference::Kind, bool& canBypassGOT) {
return false;
}
void DarwinPlatform::updateReferenceToGOT(const Reference*, bool nowGOT) {
}
const DefinedAtom* DarwinPlatform::getStub(const Atom& target, File& file) {
auto pos = _targetToStub.find(&target);
if ( pos != _targetToStub.end() ) {
// Reuse an existing stub.
assert(pos->second != nullptr);
return pos->second;
}
else {
// There is no existing stub, so create a new one.
if ( _helperCommonAtom == nullptr ) {
// Lazily create common helper code and data.
_helperCacheAtom = new X86_64NonLazyPointerAtom(file);
_stubBinderAtom = new StubBinderAtom(file);
_helperBinderAtom = new X86_64NonLazyPointerAtom(file, *_stubBinderAtom);
_helperCommonAtom = new X86_64StubHelperCommonAtom(file,
*_helperCacheAtom, *_helperBinderAtom);
}
const DefinedAtom* helper = new X86_64StubHelperAtom(file,
*_helperCommonAtom);
_stubHelperAtoms.push_back(helper);
const DefinedAtom* lp = new X86_64LazyPointerAtom(file, *helper, target);
assert(lp->contentType() == DefinedAtom::typeLazyPointer);
const DefinedAtom* stub = new X86_64StubAtom(file, *lp);
assert(stub->contentType() == DefinedAtom::typeStub);
_targetToStub[&target] = stub;
_lazyPointers.push_back(lp);
return stub;
}
}
void DarwinPlatform::addStubAtoms(File &file) {
// Add all stubs to master file.
for (auto it=_targetToStub.begin(), end=_targetToStub.end(); it != end; ++it) {
file.addAtom(*it->second);
}
// Add helper code atoms.
file.addAtom(*_helperCommonAtom);
for (const DefinedAtom *lp : _stubHelperAtoms) {
file.addAtom(*lp);
}
// Add GOT slots used for lazy binding.
file.addAtom(*_helperBinderAtom);
file.addAtom(*_helperCacheAtom);
// Add all lazy pointers to master file.
for (const DefinedAtom *lp : _lazyPointers) {
file.addAtom(*lp);
}
// Add sharedlibrary atom
file.addAtom(*_stubBinderAtom);
}
const DefinedAtom* DarwinPlatform::makeGOTEntry(const Atom&, File&) {
return nullptr;
}
void DarwinPlatform::applyFixup(Reference::Kind kind, uint64_t addend,
uint8_t* location, uint64_t fixupAddress,
uint64_t targetAddress) {
//fprintf(stderr, "applyFixup(kind=%s, addend=0x%0llX, "
// "fixupAddress=0x%0llX, targetAddress=0x%0llX\n",
// kindToString(kind).data(), addend,
// fixupAddress, targetAddress);
if ( ReferenceKind::isRipRel32(kind) ) {
// compute rip relative value and update.
int32_t* loc32 = reinterpret_cast<int32_t*>(location);
*loc32 = (targetAddress - (fixupAddress+4)) + addend;
}
else if ( kind == ReferenceKind::pointer64 ) {
uint64_t* loc64 = reinterpret_cast<uint64_t*>(location);
*loc64 = targetAddress + addend;
}
}
void DarwinPlatform::writeExecutable(const lld::File &file, raw_ostream &out) {
lld::darwin::writeExecutable(file, *this, out);
}
uint64_t DarwinPlatform::pageZeroSize() {
return 0x100000000;
}
void DarwinPlatform::initializeMachHeader(const lld::File& file,
mach_header& mh) {
// FIXME: Need to get cpu info from file object
mh.magic = MAGIC_64;
mh.cputype = CPU_TYPE_X86_64;
mh.cpusubtype = CPU_SUBTYPE_X86_64_ALL;
mh.filetype = MH_EXECUTE;
mh.ncmds = 0;
mh.sizeofcmds = 0;
mh.flags = 0;
mh.reserved = 0;
}
const Atom *DarwinPlatform::mainAtom() {
assert(_cRuntimeFile != nullptr);
const Atom *result = _cRuntimeFile->mainAtom();
assert(result != nullptr);
if ( result->definition() == Atom::definitionUndefined )
llvm::report_fatal_error("_main not found");
return _cRuntimeFile->mainAtom();
}
} // namespace darwin
} // namespace lld
|
