// 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 Apply)
// 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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