diff --git a/llvm/include/llvm/ObjectYAML/MachOYAML.h b/llvm/include/llvm/ObjectYAML/MachOYAML.h --- a/llvm/include/llvm/ObjectYAML/MachOYAML.h +++ b/llvm/include/llvm/ObjectYAML/MachOYAML.h @@ -130,6 +130,7 @@ std::vector IndirectSymbols; std::vector FunctionStarts; std::vector DataInCode; + std::vector ChainedFixups; bool isEmpty() const; }; diff --git a/llvm/lib/ObjectYAML/MachOEmitter.cpp b/llvm/lib/ObjectYAML/MachOEmitter.cpp --- a/llvm/lib/ObjectYAML/MachOEmitter.cpp +++ b/llvm/lib/ObjectYAML/MachOEmitter.cpp @@ -56,6 +56,7 @@ void writeExportTrie(raw_ostream &OS); void writeDynamicSymbolTable(raw_ostream &OS); void writeFunctionStarts(raw_ostream &OS); + void writeChainedFixups(raw_ostream &OS); void writeDyldExportsTrie(raw_ostream &OS); void writeDataInCode(raw_ostream &OS); @@ -488,6 +489,7 @@ MachO::symtab_command *SymtabCmd = nullptr; MachO::dysymtab_command *DSymtabCmd = nullptr; MachO::linkedit_data_command *FunctionStartsCmd = nullptr; + MachO::linkedit_data_command *ChainedFixupsCmd = nullptr; MachO::linkedit_data_command *DyldExportsTrieCmd = nullptr; MachO::linkedit_data_command *DataInCodeCmd = nullptr; for (auto &LC : Obj.LoadCommands) { @@ -522,6 +524,11 @@ WriteQueue.push_back(std::make_pair(FunctionStartsCmd->dataoff, &MachOWriter::writeFunctionStarts)); break; + case MachO::LC_DYLD_CHAINED_FIXUPS: + ChainedFixupsCmd = &LC.Data.linkedit_data_command_data; + WriteQueue.push_back(std::make_pair(ChainedFixupsCmd->dataoff, + &MachOWriter::writeChainedFixups)); + break; case MachO::LC_DYLD_EXPORTS_TRIE: DyldExportsTrieCmd = &LC.Data.linkedit_data_command_data; WriteQueue.push_back(std::make_pair(DyldExportsTrieCmd->dataoff, @@ -609,6 +616,12 @@ } } +void MachOWriter::writeChainedFixups(raw_ostream &OS) { + if (Obj.LinkEdit.ChainedFixups.size() > 0) + OS.write(reinterpret_cast(Obj.LinkEdit.ChainedFixups.data()), + Obj.LinkEdit.ChainedFixups.size()); +} + void MachOWriter::writeDyldExportsTrie(raw_ostream &OS) { dumpExportEntry(OS, Obj.LinkEdit.ExportTrie); } diff --git a/llvm/lib/ObjectYAML/MachOYAML.cpp b/llvm/lib/ObjectYAML/MachOYAML.cpp --- a/llvm/lib/ObjectYAML/MachOYAML.cpp +++ b/llvm/lib/ObjectYAML/MachOYAML.cpp @@ -30,7 +30,7 @@ WeakBindOpcodes.size() + LazyBindOpcodes.size() + ExportTrie.Children.size() + NameList.size() + StringTable.size() + FunctionStarts.size() + - DataInCode.size(); + ChainedFixups.size() + DataInCode.size(); } namespace yaml { @@ -167,6 +167,7 @@ IO.mapOptional("StringTable", LinkEditData.StringTable); IO.mapOptional("IndirectSymbols", LinkEditData.IndirectSymbols); IO.mapOptional("FunctionStarts", LinkEditData.FunctionStarts); + IO.mapOptional("ChainedFixups", LinkEditData.ChainedFixups); IO.mapOptional("DataInCode", LinkEditData.DataInCode); } diff --git a/llvm/test/ObjectYAML/MachO/chained-fixups.yaml b/llvm/test/ObjectYAML/MachO/chained-fixups.yaml new file mode 100644 --- /dev/null +++ b/llvm/test/ObjectYAML/MachO/chained-fixups.yaml @@ -0,0 +1,257 @@ +--- !mach-o +FileHeader: + magic: 0xFEEDFACF + cputype: 0x1000007 + cpusubtype: 0x3 + filetype: 0x2 + ncmds: 15 + sizeofcmds: 728 + flags: 0x200085 + reserved: 0x0 +LoadCommands: + - cmd: LC_SEGMENT_64 + cmdsize: 72 + segname: __PAGEZERO + vmaddr: 0 + vmsize: 4294967296 + fileoff: 0 + filesize: 0 + maxprot: 0 + initprot: 0 + nsects: 0 + flags: 0 + - cmd: LC_SEGMENT_64 + cmdsize: 232 + segname: __TEXT + vmaddr: 4294967296 + vmsize: 16384 + fileoff: 0 + filesize: 16384 + maxprot: 5 + initprot: 5 + nsects: 2 + flags: 0 + Sections: + - sectname: __text + segname: __TEXT + addr: 0x100003FB0 + size: 8 + offset: 0x3FB0 + align: 4 + reloff: 0x0 + nreloc: 0 + flags: 0x80000400 + reserved1: 0x0 + reserved2: 0x0 + reserved3: 0x0 + content: C30F1F0000000000 + - sectname: __unwind_info + segname: __TEXT + addr: 0x100003FB8 + size: 72 + offset: 0x3FB8 + align: 2 + reloff: 0x0 + nreloc: 0 + flags: 0x0 + reserved1: 0x0 + reserved2: 0x0 + reserved3: 0x0 + content: 010000001C000000000000001C000000000000001C00000002000000B03F00003400000034000000B93F00000000000034000000030000000C000100100001000000000000000000 + - cmd: LC_SEGMENT_64 + cmdsize: 72 + segname: __LINKEDIT + vmaddr: 4294983680 + vmsize: 16384 + fileoff: 16384 + filesize: 176 + maxprot: 1 + initprot: 1 + nsects: 0 + flags: 0 + - cmd: LC_DYLD_CHAINED_FIXUPS + cmdsize: 16 + dataoff: 16384 + datasize: 56 + - cmd: LC_DYLD_EXPORTS_TRIE + cmdsize: 16 + dataoff: 16440 + datasize: 48 + - cmd: LC_SYMTAB + cmdsize: 24 + symoff: 16504 + nsyms: 2 + stroff: 16536 + strsize: 32 + - cmd: LC_DYSYMTAB + cmdsize: 80 + ilocalsym: 0 + nlocalsym: 0 + iextdefsym: 0 + nextdefsym: 2 + iundefsym: 2 + nundefsym: 0 + tocoff: 0 + ntoc: 0 + modtaboff: 0 + nmodtab: 0 + extrefsymoff: 0 + nextrefsyms: 0 + indirectsymoff: 0 + nindirectsyms: 0 + extreloff: 0 + nextrel: 0 + locreloff: 0 + nlocrel: 0 + - cmd: LC_LOAD_DYLINKER + cmdsize: 32 + name: 12 + Content: '/usr/lib/dyld' + ZeroPadBytes: 7 + - cmd: LC_UUID + cmdsize: 24 + uuid: 362D6303-E0AC-3074-B083-CF48B87DB35D + - cmd: LC_BUILD_VERSION + cmdsize: 32 + platform: 1 + minos: 786432 + sdk: 787200 + ntools: 1 + Tools: + - tool: 3 + version: 50069504 + - cmd: LC_SOURCE_VERSION + cmdsize: 16 + version: 0 + - cmd: LC_MAIN + cmdsize: 24 + entryoff: 16304 + stacksize: 0 + - cmd: LC_LOAD_DYLIB + cmdsize: 56 + dylib: + name: 24 + timestamp: 2 + current_version: 85943299 + compatibility_version: 65536 + Content: '/usr/lib/libSystem.B.dylib' + ZeroPadBytes: 6 + - cmd: LC_FUNCTION_STARTS + cmdsize: 16 + dataoff: 16488 + datasize: 8 + - cmd: LC_DATA_IN_CODE + cmdsize: 16 + dataoff: 0 + datasize: 0 +LinkEditData: + ExportTrie: + TerminalSize: 0 + NodeOffset: 0 + Name: '' + Flags: 0x0 + Address: 0x0 + Other: 0x0 + ImportName: '' + Children: + - TerminalSize: 0 + NodeOffset: 5 + Name: _ + Flags: 0x0 + Address: 0x0 + Other: 0x0 + ImportName: '' + Children: + - TerminalSize: 2 + NodeOffset: 33 + Name: _mh_execute_header + Flags: 0x0 + Address: 0x0 + Other: 0x0 + ImportName: '' + - TerminalSize: 3 + NodeOffset: 37 + Name: main + Flags: 0x0 + Address: 0x3F98 + Other: 0x0 + ImportName: '' + NameList: + - n_strx: 2 + n_type: 0xF + n_sect: 1 + n_desc: 16 + n_value: 4294967296 + - n_strx: 22 + n_type: 0xF + n_sect: 1 + n_desc: 0 + n_value: 4294983600 + StringTable: + - ' ' + - __mh_execute_header + - _main + - '' + - '' + - '' + - '' + FunctionStarts: [ 0x3FB0 ] + ChainedFixups: [ 0x0, 0x0, 0x0, 0x0, 0x20, 0x0, 0x0, 0x0, 0x30, 0x0, + 0x0, 0x0, 0x30, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, + 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, + 0x0, 0x0, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, + 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, + 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 ] +... + +# RUN: yaml2obj %s | obj2yaml | FileCheck %s + +# CHECK: cmd: LC_DYLD_CHAINED_FIXUPS +# CHECK-NEXT: cmdsize: 16 +# CHECK-NEXT: dataoff: [[#CHAINED_FIXUPS_OFF:]] +# CHECK-NEXT: datasize: [[#CHAINED_FIXUPS_SIZE: 56]] + +# CHECK: cmd: LC_DYLD_EXPORTS_TRIE +# CHECK-NEXT: cmdsize: 16 +# CHECK-NEXT: dataoff: [[#EXPORTS_TRIE_OFF: CHAINED_FIXUPS_OFF + CHAINED_FIXUPS_SIZE]] +# CHECK-NEXT: datasize: 48 + +# CHECK: ExportTrie: +# CHECK-NEXT: TerminalSize: 0 +# CHECK-NEXT: NodeOffset: 0 +# CHECK-NEXT: Name: '' +# CHECK-NEXT: Flags: 0x0 +# CHECK-NEXT: Address: 0x0 +# CHECK-NEXT: Other: 0x0 +# CHECK-NEXT: ImportName: '' +# CHECK-NEXT: Children: +# CHECK-NEXT: - TerminalSize: 0 +# CHECK-NEXT: NodeOffset: 5 +# CHECK-NEXT: Name: _ +# CHECK-NEXT: Flags: 0x0 +# CHECK-NEXT: Address: 0x0 +# CHECK-NEXT: Other: 0x0 +# CHECK-NEXT: ImportName: '' +# CHECK-NEXT: Children: +# CHECK-NEXT: - TerminalSize: 2 +# CHECK-NEXT: NodeOffset: 33 +# CHECK-NEXT: Name: _mh_execute_header +# CHECK-NEXT: Flags: 0x0 +# CHECK-NEXT: Address: 0x0 +# CHECK-NEXT: Other: 0x0 +# CHECK-NEXT: ImportName: '' +# CHECK-NEXT: - TerminalSize: 3 +# CHECK-NEXT: NodeOffset: 37 +# CHECK-NEXT: Name: main +# CHECK-NEXT: Flags: 0x0 +# CHECK-NEXT: Address: 0x3F98 +# CHECK-NEXT: Other: 0x0 +# CHECK-NEXT: ImportName: '' + +# CHECK: ChainedFixups: +# CHECK-SAME: [ 0x0, 0x0, 0x0, 0x0, 0x20, 0x0, 0x0, 0x0, 0x30, 0x0, +# CHECK-NEXT: 0x0, 0x0, 0x30, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, +# CHECK-NEXT: 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, +# CHECK-NEXT: 0x0, 0x0, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, +# CHECK-NEXT: 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, +# CHECK-NEXT: 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 ] diff --git a/llvm/tools/obj2yaml/macho2yaml.cpp b/llvm/tools/obj2yaml/macho2yaml.cpp --- a/llvm/tools/obj2yaml/macho2yaml.cpp +++ b/llvm/tools/obj2yaml/macho2yaml.cpp @@ -41,6 +41,7 @@ void dumpExportTrie(std::unique_ptr &Y); void dumpSymbols(std::unique_ptr &Y); void dumpIndirectSymbols(std::unique_ptr &Y); + void dumpChainedFixups(std::unique_ptr &Y); void dumpDataInCode(std::unique_ptr &Y); template @@ -357,6 +358,7 @@ dumpSymbols(Y); dumpIndirectSymbols(Y); dumpFunctionStarts(Y); + dumpChainedFixups(Y); dumpDataInCode(Y); } @@ -625,6 +627,26 @@ LEData.IndirectSymbols.push_back(Obj.getIndirectSymbolTableEntry(DLC, i)); } +void MachODumper::dumpChainedFixups(std::unique_ptr &Y) { + MachOYAML::LinkEditData &LEData = Y->LinkEdit; + + for (const auto &LC : Y->LoadCommands) { + if (LC.Data.load_command_data.cmd == llvm::MachO::LC_DYLD_CHAINED_FIXUPS) { + const MachO::linkedit_data_command &DC = + LC.Data.linkedit_data_command_data; + if (DC.dataoff) { + assert(DC.dataoff < Obj.getData().size()); + assert(DC.dataoff + DC.datasize <= Obj.getData().size()); + const char *Bytes = Obj.getData().data() + DC.dataoff; + for (size_t Idx = 0; Idx < DC.datasize; Idx++) { + LEData.ChainedFixups.push_back(Bytes[Idx]); + } + } + break; + } + } +} + void MachODumper::dumpDataInCode(std::unique_ptr &Y) { MachOYAML::LinkEditData &LEData = Y->LinkEdit;