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Source file src/debug/macho/macho.go

Documentation: debug/macho

  // 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
  // http://developer.apple.com/mac/library/documentation/DeveloperTools/Conceptual/MachORuntime/Reference/reference.html
  
  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
  )
  
  // 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
  	CpuPpc   Cpu = 18
  	CpuPpc64 Cpu = CpuPpc | cpuArch64
  )
  
  var cpuStrings = []intName{
  	{uint32(Cpu386), "Cpu386"},
  	{uint32(CpuAmd64), "CpuAmd64"},
  	{uint32(CpuArm), "CpuArm"},
  	{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 = 1
  	LoadCmdSymtab     LoadCmd = 2
  	LoadCmdThread     LoadCmd = 4
  	LoadCmdUnixThread LoadCmd = 5 // thread+stack
  	LoadCmdDysymtab   LoadCmd = 11
  	LoadCmdDylib      LoadCmd = 12
  	LoadCmdDylinker   LoadCmd = 15
  	LoadCmdSegment64  LoadCmd = 25
  )
  
  var cmdStrings = []intName{
  	{uint32(LoadCmdSegment), "LoadCmdSegment"},
  	{uint32(LoadCmdThread), "LoadCmdThread"},
  	{uint32(LoadCmdUnixThread), "LoadCmdUnixThread"},
  	{uint32(LoadCmdDylib), "LoadCmdDylib"},
  	{uint32(LoadCmdSegment64), "LoadCmdSegment64"},
  }
  
  func (i LoadCmd) String() string   { return stringName(uint32(i), cmdStrings, false) }
  func (i LoadCmd) GoString() string { return stringName(uint32(i), cmdStrings, true) }
  
  // A Segment64 is a 64-bit Mach-O segment load command.
  type 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 Segment32 is a 32-bit Mach-O segment load command.
  type 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 DylibCmd is a Mach-O load dynamic library command.
  type DylibCmd struct {
  	Cmd            LoadCmd
  	Len            uint32
  	Name           uint32
  	Time           uint32
  	CurrentVersion uint32
  	CompatVersion  uint32
  }
  
  // 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
  }
  
  // A SymtabCmd is a Mach-O symbol table command.
  type SymtabCmd struct {
  	Cmd     LoadCmd
  	Len     uint32
  	Symoff  uint32
  	Nsyms   uint32
  	Stroff  uint32
  	Strsize uint32
  }
  
  // A DysymtabCmd is a Mach-O dynamic symbol table command.
  type 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
  }
  
  // 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
  }
  
  // A Symbol is a Mach-O 32-bit or 64-bit symbol table entry.
  type Symbol struct {
  	Name  string
  	Type  uint8
  	Sect  uint8
  	Desc  uint16
  	Value uint64
  }
  
  // A Thread is a Mach-O thread state command.
  type Thread struct {
  	Cmd  LoadCmd
  	Len  uint32
  	Type uint32
  	Data []uint32
  }
  
  // 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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