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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "courgette/disassembler_elf_32.h" | 5 #include "courgette/disassembler_elf_32.h" |
6 | 6 |
7 #include <algorithm> | 7 #include <algorithm> |
8 #include <iterator> | 8 #include <iterator> |
9 #include <utility> | |
10 | 9 |
11 #include "base/bind.h" | 10 #include "base/bind.h" |
12 #include "base/logging.h" | 11 #include "base/logging.h" |
13 #include "courgette/assembly_program.h" | 12 #include "courgette/assembly_program.h" |
14 #include "courgette/courgette.h" | 13 #include "courgette/courgette.h" |
15 | 14 |
16 namespace courgette { | 15 namespace courgette { |
17 | 16 |
18 namespace { | 17 namespace { |
19 | 18 |
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157 if (default_string_section_[default_string_section_size_ - 1] != '\0') | 156 if (default_string_section_[default_string_section_size_ - 1] != '\0') |
158 return Bad("String section does not terminate"); | 157 return Bad("String section does not terminate"); |
159 } | 158 } |
160 | 159 |
161 if (!UpdateLength()) | 160 if (!UpdateLength()) |
162 return Bad("Out of bounds section or segment"); | 161 return Bad("Out of bounds section or segment"); |
163 | 162 |
164 return Good(); | 163 return Good(); |
165 } | 164 } |
166 | 165 |
167 bool DisassemblerElf32::Disassemble(AssemblyProgram* target) { | 166 bool DisassemblerElf32::Disassemble(AssemblyProgram* program) { |
168 if (!ok()) | 167 if (!ok()) |
169 return false; | 168 return false; |
170 | 169 |
171 // The Image Base is always 0 for ELF Executables | |
172 target->set_image_base(0); | |
173 | |
174 if (!ParseAbs32Relocs()) | 170 if (!ParseAbs32Relocs()) |
175 return false; | 171 return false; |
176 | 172 |
177 if (!ParseRel32RelocsFromSections()) // Does not sort rel32 locations. | 173 if (!ParseRel32RelocsFromSections()) // Does not sort rel32 locations. |
178 return false; | 174 return false; |
179 | 175 |
180 PrecomputeLabels(target); | 176 PrecomputeLabels(program); |
181 RemoveUnusedRel32Locations(target); | 177 RemoveUnusedRel32Locations(program); |
182 | 178 |
183 if (!target->GenerateInstructions( | 179 if (!program->GenerateInstructions( |
184 base::Bind(&DisassemblerElf32::ParseFile, base::Unretained(this)))) { | 180 base::Bind(&DisassemblerElf32::ParseFile, base::Unretained(this)))) { |
185 return false; | 181 return false; |
186 } | 182 } |
187 | 183 |
188 // Finally sort rel32 locations. | 184 // Finally sort rel32 locations. |
189 std::sort(rel32_locations_.begin(), | 185 std::sort(rel32_locations_.begin(), |
190 rel32_locations_.end(), | 186 rel32_locations_.end(), |
191 TypedRVA::IsLessThanByRVA); | 187 TypedRVA::IsLessThanByRVA); |
192 DCHECK(rel32_locations_.empty() || | 188 DCHECK(rel32_locations_.empty() || |
193 rel32_locations_.back()->rva() != kUnassignedRVA); | 189 rel32_locations_.back()->rva() != kUnassignedRVA); |
194 | 190 |
195 target->DefaultAssignIndexes(); | 191 program->DefaultAssignIndexes(); |
196 return true; | 192 return true; |
197 } | 193 } |
198 | 194 |
199 CheckBool DisassemblerElf32::IsValidTargetRVA(RVA rva) const { | 195 CheckBool DisassemblerElf32::IsValidTargetRVA(RVA rva) const { |
200 if (rva == kUnassignedRVA) | 196 if (rva == kUnassignedRVA) |
201 return false; | 197 return false; |
202 | 198 |
203 // |rva| is valid if it's contained in any program segment. | 199 // |rva| is valid if it's contained in any program segment. |
204 for (Elf32_Half segment_id = 0; segment_id < ProgramSegmentHeaderCount(); | 200 for (Elf32_Half segment_id = 0; segment_id < ProgramSegmentHeaderCount(); |
205 ++segment_id) { | 201 ++segment_id) { |
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627 if (!ParseRel32RelocsFromSection(section_header)) | 623 if (!ParseRel32RelocsFromSection(section_header)) |
628 return false; | 624 return false; |
629 } | 625 } |
630 if (!found_rel32) | 626 if (!found_rel32) |
631 VLOG(1) << "Warning: Found no rel32 addresses. Missing .text section?"; | 627 VLOG(1) << "Warning: Found no rel32 addresses. Missing .text section?"; |
632 | 628 |
633 return true; | 629 return true; |
634 } | 630 } |
635 | 631 |
636 } // namespace courgette | 632 } // namespace courgette |
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