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
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
//===-- ELFDump.cpp - ELF-specific dumper -----------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file implements the ELF-specific dumper for llvm-objdump.
///
//===----------------------------------------------------------------------===//
#include "llvm-objdump.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using namespace llvm::object;
template <class ELFT>
Expected<StringRef> getDynamicStrTab(const ELFFile<ELFT> *Elf) {
typedef ELFFile<ELFT> ELFO;
auto DynamicEntriesOrError = Elf->dynamicEntries();
if (!DynamicEntriesOrError)
return DynamicEntriesOrError.takeError();
for (const typename ELFO::Elf_Dyn &Dyn : *DynamicEntriesOrError) {
if (Dyn.d_tag == ELF::DT_STRTAB) {
auto MappedAddrOrError = Elf->toMappedAddr(Dyn.getPtr());
if (!MappedAddrOrError)
consumeError(MappedAddrOrError.takeError());
return StringRef(reinterpret_cast<const char *>(*MappedAddrOrError));
}
}
// If the dynamic segment is not present, we fall back on the sections.
auto SectionsOrError = Elf->sections();
if (!SectionsOrError)
return SectionsOrError.takeError();
for (const typename ELFO::Elf_Shdr &Sec : *SectionsOrError) {
if (Sec.sh_type == ELF::SHT_DYNSYM)
return Elf->getStringTableForSymtab(Sec);
}
return createError("dynamic string table not found");
}
template <class ELFT>
void printDynamicSection(const ELFFile<ELFT> *Elf, StringRef Filename) {
auto ProgramHeaderOrError = Elf->program_headers();
if (!ProgramHeaderOrError)
report_error(Filename, ProgramHeaderOrError.takeError());
auto DynamicEntriesOrError = Elf->dynamicEntries();
if (!DynamicEntriesOrError)
report_error(Filename, DynamicEntriesOrError.takeError());
outs() << "Dynamic Section:\n";
for (const auto &Dyn : *DynamicEntriesOrError) {
if (Dyn.d_tag == ELF::DT_NULL)
continue;
StringRef Str = StringRef(Elf->getDynamicTagAsString(Dyn.d_tag));
if (Str.empty()) {
std::string HexStr = utohexstr(static_cast<uint64_t>(Dyn.d_tag), true);
outs() << format(" 0x%-19s", HexStr.c_str());
} else {
// We use "-21" in order to match GNU objdump's output.
outs() << format(" %-21s", Str.data());
}
const char *Fmt =
ELFT::Is64Bits ? "0x%016" PRIx64 "\n" : "0x%08" PRIx64 "\n";
if (Dyn.d_tag == ELF::DT_NEEDED) {
Expected<StringRef> StrTabOrErr = getDynamicStrTab(Elf);
if (StrTabOrErr) {
const char *Data = StrTabOrErr.get().data();
outs() << (Data + Dyn.d_un.d_val) << "\n";
continue;
}
warn(errorToErrorCode(StrTabOrErr.takeError()).message());
consumeError(StrTabOrErr.takeError());
}
outs() << format(Fmt, (uint64_t)Dyn.d_un.d_val);
}
}
template <class ELFT> void printProgramHeaders(const ELFFile<ELFT> *o) {
typedef ELFFile<ELFT> ELFO;
outs() << "Program Header:\n";
auto ProgramHeaderOrError = o->program_headers();
if (!ProgramHeaderOrError)
report_fatal_error(
errorToErrorCode(ProgramHeaderOrError.takeError()).message());
for (const typename ELFO::Elf_Phdr &Phdr : *ProgramHeaderOrError) {
switch (Phdr.p_type) {
case ELF::PT_DYNAMIC:
outs() << " DYNAMIC ";
break;
case ELF::PT_GNU_EH_FRAME:
outs() << "EH_FRAME ";
break;
case ELF::PT_GNU_RELRO:
outs() << " RELRO ";
break;
case ELF::PT_GNU_STACK:
outs() << " STACK ";
break;
case ELF::PT_INTERP:
outs() << " INTERP ";
break;
case ELF::PT_LOAD:
outs() << " LOAD ";
break;
case ELF::PT_NOTE:
outs() << " NOTE ";
break;
case ELF::PT_OPENBSD_BOOTDATA:
outs() << " OPENBSD_BOOTDATA ";
break;
case ELF::PT_OPENBSD_RANDOMIZE:
outs() << " OPENBSD_RANDOMIZE ";
break;
case ELF::PT_OPENBSD_WXNEEDED:
outs() << " OPENBSD_WXNEEDED ";
break;
case ELF::PT_PHDR:
outs() << " PHDR ";
break;
case ELF::PT_TLS:
outs() << " TLS ";
break;
default:
outs() << " UNKNOWN ";
}
const char *Fmt = ELFT::Is64Bits ? "0x%016" PRIx64 " " : "0x%08" PRIx64 " ";
outs() << "off " << format(Fmt, (uint64_t)Phdr.p_offset) << "vaddr "
<< format(Fmt, (uint64_t)Phdr.p_vaddr) << "paddr "
<< format(Fmt, (uint64_t)Phdr.p_paddr)
<< format("align 2**%u\n",
countTrailingZeros<uint64_t>(Phdr.p_align))
<< " filesz " << format(Fmt, (uint64_t)Phdr.p_filesz)
<< "memsz " << format(Fmt, (uint64_t)Phdr.p_memsz) << "flags "
<< ((Phdr.p_flags & ELF::PF_R) ? "r" : "-")
<< ((Phdr.p_flags & ELF::PF_W) ? "w" : "-")
<< ((Phdr.p_flags & ELF::PF_X) ? "x" : "-") << "\n";
}
outs() << "\n";
}
void llvm::printELFFileHeader(const object::ObjectFile *Obj) {
// Little-endian 32-bit
if (const ELF32LEObjectFile *ELFObj = dyn_cast<ELF32LEObjectFile>(Obj))
printProgramHeaders(ELFObj->getELFFile());
// Big-endian 32-bit
if (const ELF32BEObjectFile *ELFObj = dyn_cast<ELF32BEObjectFile>(Obj))
printProgramHeaders(ELFObj->getELFFile());
// Little-endian 64-bit
if (const ELF64LEObjectFile *ELFObj = dyn_cast<ELF64LEObjectFile>(Obj))
printProgramHeaders(ELFObj->getELFFile());
// Big-endian 64-bit
if (const ELF64BEObjectFile *ELFObj = dyn_cast<ELF64BEObjectFile>(Obj))
printProgramHeaders(ELFObj->getELFFile());
}
void llvm::printELFDynamicSection(const object::ObjectFile *Obj) {
// Little-endian 32-bit
if (const ELF32LEObjectFile *ELFObj = dyn_cast<ELF32LEObjectFile>(Obj))
printDynamicSection(ELFObj->getELFFile(), Obj->getFileName());
// Big-endian 32-bit
if (const ELF32BEObjectFile *ELFObj = dyn_cast<ELF32BEObjectFile>(Obj))
printDynamicSection(ELFObj->getELFFile(), Obj->getFileName());
// Little-endian 64-bit
if (const ELF64LEObjectFile *ELFObj = dyn_cast<ELF64LEObjectFile>(Obj))
printDynamicSection(ELFObj->getELFFile(), Obj->getFileName());
// Big-endian 64-bit
if (const ELF64BEObjectFile *ELFObj = dyn_cast<ELF64BEObjectFile>(Obj))
printDynamicSection(ELFObj->getELFFile(), Obj->getFileName());
}
|
