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b1907b87cd
This adds support for YAML round tripping dyld info bind opcodes. Bind opcodes can have signed or unsigned LEB128 data, and they can have symbols associated with them. llvm-svn: 270901
333 lines
11 KiB
C++
333 lines
11 KiB
C++
//===------ macho2yaml.cpp - obj2yaml conversion tool -----------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "Error.h"
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#include "obj2yaml.h"
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#include "llvm/Object/MachOUniversal.h"
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#include "llvm/ObjectYAML/MachOYAML.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/LEB128.h"
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#include <string.h> // for memcpy
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using namespace llvm;
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class MachODumper {
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template <typename StructType>
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const char *processLoadCommandData(
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MachOYAML::LoadCommand &LC,
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const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd);
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const object::MachOObjectFile &Obj;
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void dumpHeader(std::unique_ptr<MachOYAML::Object> &Y);
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void dumpLoadCommands(std::unique_ptr<MachOYAML::Object> &Y);
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void dumpLinkEdit(std::unique_ptr<MachOYAML::Object> &Y);
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void dumpRebaseOpcodes(std::unique_ptr<MachOYAML::Object> &Y);
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void dumpBindOpcodes(std::vector<MachOYAML::BindOpcode> &BindOpcodes,
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ArrayRef<uint8_t> OpcodeBuffer, bool Lazy = false);
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public:
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MachODumper(const object::MachOObjectFile &O) : Obj(O) {}
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Expected<std::unique_ptr<MachOYAML::Object>> dump();
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};
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#define HANDLE_LOAD_COMMAND(LCName, LCValue, LCStruct) \
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case MachO::LCName: \
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memcpy((void *) & (LC.Data.LCStruct##_data), LoadCmd.Ptr, \
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sizeof(MachO::LCStruct)); \
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if (Obj.isLittleEndian() != sys::IsLittleEndianHost) \
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MachO::swapStruct(LC.Data.LCStruct##_data); \
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EndPtr = processLoadCommandData<MachO::LCStruct>(LC, LoadCmd); \
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break;
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template <typename SectionType>
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MachOYAML::Section constructSectionCommon(SectionType Sec) {
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MachOYAML::Section TempSec;
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memcpy(reinterpret_cast<void *>(&TempSec.sectname[0]), &Sec.sectname[0], 16);
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memcpy(reinterpret_cast<void *>(&TempSec.segname[0]), &Sec.segname[0], 16);
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TempSec.addr = Sec.addr;
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TempSec.size = Sec.size;
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TempSec.offset = Sec.offset;
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TempSec.align = Sec.align;
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TempSec.reloff = Sec.reloff;
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TempSec.nreloc = Sec.nreloc;
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TempSec.flags = Sec.flags;
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TempSec.reserved1 = Sec.reserved1;
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TempSec.reserved2 = Sec.reserved2;
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TempSec.reserved3 = 0;
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return TempSec;
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}
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template <typename SectionType>
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MachOYAML::Section constructSection(SectionType Sec);
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template <> MachOYAML::Section constructSection(MachO::section Sec) {
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MachOYAML::Section TempSec = constructSectionCommon(Sec);
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TempSec.reserved3 = 0;
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return TempSec;
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}
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template <> MachOYAML::Section constructSection(MachO::section_64 Sec) {
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MachOYAML::Section TempSec = constructSectionCommon(Sec);
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TempSec.reserved3 = Sec.reserved3;
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return TempSec;
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}
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template <typename SectionType, typename SegmentType>
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const char *
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extractSections(const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd,
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std::vector<MachOYAML::Section> &Sections,
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bool IsLittleEndian) {
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auto End = LoadCmd.Ptr + LoadCmd.C.cmdsize;
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const SectionType *Curr =
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reinterpret_cast<const SectionType *>(LoadCmd.Ptr + sizeof(SegmentType));
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for (; reinterpret_cast<const void *>(Curr) < End; Curr++) {
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if (IsLittleEndian != sys::IsLittleEndianHost) {
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SectionType Sec;
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memcpy((void *)&Sec, Curr, sizeof(SectionType));
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MachO::swapStruct(Sec);
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Sections.push_back(constructSection(Sec));
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} else {
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Sections.push_back(constructSection(*Curr));
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}
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}
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return reinterpret_cast<const char *>(Curr);
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}
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template <typename StructType>
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const char *MachODumper::processLoadCommandData(
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MachOYAML::LoadCommand &LC,
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const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd) {
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return LoadCmd.Ptr + sizeof(StructType);
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}
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template <>
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const char *MachODumper::processLoadCommandData<MachO::segment_command>(
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MachOYAML::LoadCommand &LC,
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const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd) {
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return extractSections<MachO::section, MachO::segment_command>(
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LoadCmd, LC.Sections, Obj.isLittleEndian());
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}
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template <>
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const char *MachODumper::processLoadCommandData<MachO::segment_command_64>(
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MachOYAML::LoadCommand &LC,
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const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd) {
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return extractSections<MachO::section_64, MachO::segment_command_64>(
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LoadCmd, LC.Sections, Obj.isLittleEndian());
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}
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template <typename StructType>
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const char *
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readString(MachOYAML::LoadCommand &LC,
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const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd) {
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auto Start = LoadCmd.Ptr + sizeof(StructType);
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auto MaxSize = LoadCmd.C.cmdsize - sizeof(StructType);
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auto Size = strnlen(Start, MaxSize);
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LC.PayloadString = StringRef(Start, Size).str();
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return Start + Size;
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}
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template <>
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const char *MachODumper::processLoadCommandData<MachO::dylib_command>(
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MachOYAML::LoadCommand &LC,
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const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd) {
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return readString<MachO::dylib_command>(LC, LoadCmd);
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}
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template <>
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const char *MachODumper::processLoadCommandData<MachO::dylinker_command>(
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MachOYAML::LoadCommand &LC,
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const llvm::object::MachOObjectFile::LoadCommandInfo &LoadCmd) {
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return readString<MachO::dylinker_command>(LC, LoadCmd);
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}
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Expected<std::unique_ptr<MachOYAML::Object>> MachODumper::dump() {
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auto Y = make_unique<MachOYAML::Object>();
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dumpHeader(Y);
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dumpLoadCommands(Y);
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dumpLinkEdit(Y);
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return std::move(Y);
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}
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void MachODumper::dumpHeader(std::unique_ptr<MachOYAML::Object> &Y) {
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Y->Header.magic = Obj.getHeader().magic;
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Y->Header.cputype = Obj.getHeader().cputype;
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Y->Header.cpusubtype = Obj.getHeader().cpusubtype;
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Y->Header.filetype = Obj.getHeader().filetype;
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Y->Header.ncmds = Obj.getHeader().ncmds;
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Y->Header.sizeofcmds = Obj.getHeader().sizeofcmds;
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Y->Header.flags = Obj.getHeader().flags;
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Y->Header.reserved = 0;
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}
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void MachODumper::dumpLoadCommands(std::unique_ptr<MachOYAML::Object> &Y) {
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for (auto LoadCmd : Obj.load_commands()) {
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MachOYAML::LoadCommand LC;
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const char *EndPtr = LoadCmd.Ptr;
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switch (LoadCmd.C.cmd) {
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default:
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memcpy((void *)&(LC.Data.load_command_data), LoadCmd.Ptr,
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sizeof(MachO::load_command));
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if (Obj.isLittleEndian() != sys::IsLittleEndianHost)
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MachO::swapStruct(LC.Data.load_command_data);
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EndPtr = processLoadCommandData<MachO::load_command>(LC, LoadCmd);
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break;
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#include "llvm/Support/MachO.def"
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}
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auto RemainingBytes = LoadCmd.C.cmdsize - (EndPtr - LoadCmd.Ptr);
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if (!std::all_of(EndPtr, &EndPtr[RemainingBytes],
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[](const char C) { return C == 0; })) {
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LC.PayloadBytes.insert(LC.PayloadBytes.end(), EndPtr,
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&EndPtr[RemainingBytes]);
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RemainingBytes = 0;
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}
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LC.ZeroPadBytes = RemainingBytes;
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Y->LoadCommands.push_back(std::move(LC));
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}
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}
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void MachODumper::dumpLinkEdit(std::unique_ptr<MachOYAML::Object> &Y) {
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dumpRebaseOpcodes(Y);
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dumpBindOpcodes(Y->LinkEdit.BindOpcodes, Obj.getDyldInfoBindOpcodes());
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}
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void MachODumper::dumpRebaseOpcodes(std::unique_ptr<MachOYAML::Object> &Y) {
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MachOYAML::LinkEditData &LEData = Y->LinkEdit;
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auto RebaseOpcodes = Obj.getDyldInfoRebaseOpcodes();
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for (auto OpCode = RebaseOpcodes.begin(); OpCode != RebaseOpcodes.end();
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++OpCode) {
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MachOYAML::RebaseOpcode RebaseOp;
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RebaseOp.Opcode =
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static_cast<MachO::RebaseOpcode>(*OpCode & MachO::REBASE_OPCODE_MASK);
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RebaseOp.Imm = *OpCode & MachO::REBASE_IMMEDIATE_MASK;
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unsigned Count;
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uint64_t ULEB = 0;
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switch (RebaseOp.Opcode) {
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case MachO::REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB:
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ULEB = decodeULEB128(OpCode + 1, &Count);
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RebaseOp.ExtraData.push_back(ULEB);
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OpCode += Count;
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// Intentionally no break here -- This opcode has two ULEB values
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case MachO::REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
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case MachO::REBASE_OPCODE_ADD_ADDR_ULEB:
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case MachO::REBASE_OPCODE_DO_REBASE_ULEB_TIMES:
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case MachO::REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB:
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ULEB = decodeULEB128(OpCode + 1, &Count);
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RebaseOp.ExtraData.push_back(ULEB);
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OpCode += Count;
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break;
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default:
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break;
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}
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LEData.RebaseOpcodes.push_back(RebaseOp);
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if (RebaseOp.Opcode == MachO::REBASE_OPCODE_DONE)
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break;
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}
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}
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void MachODumper::dumpBindOpcodes(
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std::vector<MachOYAML::BindOpcode> &BindOpcodes,
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ArrayRef<uint8_t> OpcodeBuffer, bool Lazy) {
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for (auto OpCode = OpcodeBuffer.begin(); OpCode != OpcodeBuffer.end();
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++OpCode) {
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MachOYAML::BindOpcode BindOp;
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BindOp.Opcode =
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static_cast<MachO::BindOpcode>(*OpCode & MachO::BIND_OPCODE_MASK);
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BindOp.Imm = *OpCode & MachO::BIND_IMMEDIATE_MASK;
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unsigned Count;
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uint64_t ULEB = 0;
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int64_t SLEB = 0;
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const uint8_t *SymStart;
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switch (BindOp.Opcode) {
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case MachO::BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:
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ULEB = decodeULEB128(OpCode + 1, &Count);
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BindOp.ULEBExtraData.push_back(ULEB);
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OpCode += Count;
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// Intentionally no break here -- this opcode has two ULEB values
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case MachO::BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB:
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case MachO::BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
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case MachO::BIND_OPCODE_ADD_ADDR_ULEB:
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case MachO::BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:
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ULEB = decodeULEB128(OpCode + 1, &Count);
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BindOp.ULEBExtraData.push_back(ULEB);
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OpCode += Count;
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break;
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case MachO::BIND_OPCODE_SET_ADDEND_SLEB:
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SLEB = decodeSLEB128(OpCode + 1, &Count);
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BindOp.SLEBExtraData.push_back(SLEB);
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OpCode += Count;
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break;
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case MachO::BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:
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SymStart = ++OpCode;
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while (*OpCode) {
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++OpCode;
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}
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BindOp.Symbol = StringRef(reinterpret_cast<const char *>(SymStart),
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OpCode - SymStart);
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break;
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default:
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break;
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}
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BindOpcodes.push_back(BindOp);
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// Lazy bindings have DONE opcodes between operations, so we need to keep
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// processing after a DONE.
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if (!Lazy && BindOp.Opcode == MachO::BIND_OPCODE_DONE)
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break;
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}
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}
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Error macho2yaml(raw_ostream &Out, const object::MachOObjectFile &Obj) {
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MachODumper Dumper(Obj);
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Expected<std::unique_ptr<MachOYAML::Object>> YAML = Dumper.dump();
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if (!YAML)
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return YAML.takeError();
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yaml::Output Yout(Out);
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Yout << *(YAML.get());
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return Error::success();
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}
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Error macho2yaml(raw_ostream &Out, const object::MachOUniversalBinary &Obj) {
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return make_error<Obj2YamlError>(obj2yaml_error::not_implemented);
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}
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std::error_code macho2yaml(raw_ostream &Out, const object::ObjectFile &Obj) {
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if (const auto *MachOObj = dyn_cast<object::MachOUniversalBinary>(&Obj)) {
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if (auto Err = macho2yaml(Out, *MachOObj)) {
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return errorToErrorCode(std::move(Err));
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}
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return obj2yaml_error::success;
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}
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if (const auto *MachOObj = dyn_cast<object::MachOObjectFile>(&Obj)) {
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if (auto Err = macho2yaml(Out, *MachOObj)) {
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return errorToErrorCode(std::move(Err));
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}
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return obj2yaml_error::success;
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}
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return obj2yaml_error::unsupported_obj_file_format;
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}
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