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macho.go
// Copyright 2009 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Mach-O header data structures // Originally at: // http://developer.apple.com/mac/library/documentation/DeveloperTools/Conceptual/MachORuntime/Reference/reference.html (since deleted by Apple) // Archived copy at: // https://web.archive.org/web/20090819232456/http://developer.apple.com/documentation/DeveloperTools/Conceptual/MachORuntime/index.html // For cloned PDF see: // https://github.com/aidansteele/osx-abi-macho-file-format-reference package macho import "strconv" // A FileHeader represents a Mach-O file header. type FileHeader struct { Magic uint32 Cpu Cpu SubCpu uint32 Type Type Ncmd uint32 Cmdsz uint32 Flags uint32 } const ( fileHeaderSize32 = 7 * 4 fileHeaderSize64 = 8 * 4 ) const ( Magic32 uint32 = 0xfeedface Magic64 uint32 = 0xfeedfacf MagicFat uint32 = 0xcafebabe ) // A Type is the Mach-O file type, e.g. an object file, executable, or dynamic library. type Type uint32 const ( TypeObj Type = 1 TypeExec Type = 2 TypeDylib Type = 6 TypeBundle Type = 8 ) var typeStrings = []intName{ {uint32(TypeObj), "Obj"}, {uint32(TypeExec), "Exec"}, {uint32(TypeDylib), "Dylib"}, {uint32(TypeBundle), "Bundle"}, } func (t Type) String() string { return stringName(uint32(t), typeStrings, false) } func (t Type) GoString() string { return stringName(uint32(t), typeStrings, true) } // A Cpu is a Mach-O cpu type. type Cpu uint32 const cpuArch64 = 0x01000000 const ( Cpu386 Cpu = 7 CpuAmd64 Cpu = Cpu386 | cpuArch64 CpuArm Cpu = 12 CpuArm64 Cpu = CpuArm | cpuArch64 CpuPpc Cpu = 18 CpuPpc64 Cpu = CpuPpc | cpuArch64 ) var cpuStrings = []intName{ {uint32(Cpu386), "Cpu386"}, {uint32(CpuAmd64), "CpuAmd64"}, {uint32(CpuArm), "CpuArm"}, {uint32(CpuArm64), "CpuArm64"}, {uint32(CpuPpc), "CpuPpc"}, {uint32(CpuPpc64), "CpuPpc64"}, } func (i Cpu) String() string { return stringName(uint32(i), cpuStrings, false) } func (i Cpu) GoString() string { return stringName(uint32(i), cpuStrings, true) } // A LoadCmd is a Mach-O load command. type LoadCmd uint32 const ( LoadCmdSegment LoadCmd = 0x1 LoadCmdSymtab LoadCmd = 0x2 LoadCmdThread LoadCmd = 0x4 LoadCmdUnixThread LoadCmd = 0x5 // thread+stack LoadCmdDysymtab LoadCmd = 0xb LoadCmdDylib LoadCmd = 0xc // load dylib command LoadCmdDylinker LoadCmd = 0xf // id dylinker command (not load dylinker command) LoadCmdSegment64 LoadCmd = 0x19 LoadCmdRpath LoadCmd = 0x8000001c ) var cmdStrings = []intName{ {uint32(LoadCmdSegment), "LoadCmdSegment"}, {uint32(LoadCmdThread), "LoadCmdThread"}, {uint32(LoadCmdUnixThread), "LoadCmdUnixThread"}, {uint32(LoadCmdDylib), "LoadCmdDylib"}, {uint32(LoadCmdSegment64), "LoadCmdSegment64"}, {uint32(LoadCmdRpath), "LoadCmdRpath"}, } func (i LoadCmd) String() string { return stringName(uint32(i), cmdStrings, false) } func (i LoadCmd) GoString() string { return stringName(uint32(i), cmdStrings, true) } type ( // A Segment32 is a 32-bit Mach-O segment load command. Segment32 struct { Cmd LoadCmd Len uint32 Name [16]byte Addr uint32 Memsz uint32 Offset uint32 Filesz uint32 Maxprot uint32 Prot uint32 Nsect uint32 Flag uint32 } // A Segment64 is a 64-bit Mach-O segment load command. Segment64 struct { Cmd LoadCmd Len uint32 Name [16]byte Addr uint64 Memsz uint64 Offset uint64 Filesz uint64 Maxprot uint32 Prot uint32 Nsect uint32 Flag uint32 } // A SymtabCmd is a Mach-O symbol table command. SymtabCmd struct { Cmd LoadCmd Len uint32 Symoff uint32 Nsyms uint32 Stroff uint32 Strsize uint32 } // A DysymtabCmd is a Mach-O dynamic symbol table command. DysymtabCmd struct { Cmd LoadCmd Len uint32 Ilocalsym uint32 Nlocalsym uint32 Iextdefsym uint32 Nextdefsym uint32 Iundefsym uint32 Nundefsym uint32 Tocoffset uint32 Ntoc uint32 Modtaboff uint32 Nmodtab uint32 Extrefsymoff uint32 Nextrefsyms uint32 Indirectsymoff uint32 Nindirectsyms uint32 Extreloff uint32 Nextrel uint32 Locreloff uint32 Nlocrel uint32 } // A DylibCmd is a Mach-O load dynamic library command. DylibCmd struct { Cmd LoadCmd Len uint32 Name uint32 Time uint32 CurrentVersion uint32 CompatVersion uint32 } // A RpathCmd is a Mach-O rpath command. RpathCmd struct { Cmd LoadCmd Len uint32 Path uint32 } // A Thread is a Mach-O thread state command. Thread struct { Cmd LoadCmd Len uint32 Type uint32 Data []uint32 } ) const ( FlagNoUndefs uint32 = 0x1 FlagIncrLink uint32 = 0x2 FlagDyldLink uint32 = 0x4 FlagBindAtLoad uint32 = 0x8 FlagPrebound uint32 = 0x10 FlagSplitSegs uint32 = 0x20 FlagLazyInit uint32 = 0x40 FlagTwoLevel uint32 = 0x80 FlagForceFlat uint32 = 0x100 FlagNoMultiDefs uint32 = 0x200 FlagNoFixPrebinding uint32 = 0x400 FlagPrebindable uint32 = 0x800 FlagAllModsBound uint32 = 0x1000 FlagSubsectionsViaSymbols uint32 = 0x2000 FlagCanonical uint32 = 0x4000 FlagWeakDefines uint32 = 0x8000 FlagBindsToWeak uint32 = 0x10000 FlagAllowStackExecution uint32 = 0x20000 FlagRootSafe uint32 = 0x40000 FlagSetuidSafe uint32 = 0x80000 FlagNoReexportedDylibs uint32 = 0x100000 FlagPIE uint32 = 0x200000 FlagDeadStrippableDylib uint32 = 0x400000 FlagHasTLVDescriptors uint32 = 0x800000 FlagNoHeapExecution uint32 = 0x1000000 FlagAppExtensionSafe uint32 = 0x2000000 ) // A Section32 is a 32-bit Mach-O section header. type Section32 struct { Name [16]byte Seg [16]byte Addr uint32 Size uint32 Offset uint32 Align uint32 Reloff uint32 Nreloc uint32 Flags uint32 Reserve1 uint32 Reserve2 uint32 } // A Section64 is a 64-bit Mach-O section header. type Section64 struct { Name [16]byte Seg [16]byte Addr uint64 Size uint64 Offset uint32 Align uint32 Reloff uint32 Nreloc uint32 Flags uint32 Reserve1 uint32 Reserve2 uint32 Reserve3 uint32 } // An Nlist32 is a Mach-O 32-bit symbol table entry. type Nlist32 struct { Name uint32 Type uint8 Sect uint8 Desc uint16 Value uint32 } // An Nlist64 is a Mach-O 64-bit symbol table entry. type Nlist64 struct { Name uint32 Type uint8 Sect uint8 Desc uint16 Value uint64 } // Regs386 is the Mach-O 386 register structure. type Regs386 struct { AX uint32 BX uint32 CX uint32 DX uint32 DI uint32 SI uint32 BP uint32 SP uint32 SS uint32 FLAGS uint32 IP uint32 CS uint32 DS uint32 ES uint32 FS uint32 GS uint32 } // RegsAMD64 is the Mach-O AMD64 register structure. type RegsAMD64 struct { AX uint64 BX uint64 CX uint64 DX uint64 DI uint64 SI uint64 BP uint64 SP uint64 R8 uint64 R9 uint64 R10 uint64 R11 uint64 R12 uint64 R13 uint64 R14 uint64 R15 uint64 IP uint64 FLAGS uint64 CS uint64 FS uint64 GS uint64 } type intName struct { i uint32 s string } func stringName(i uint32, names []intName, goSyntax bool) string { for _, n := range names { if n.i == i { if goSyntax { return "macho." + n.s } return n.s } } return strconv.FormatUint(uint64(i), 10) }
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