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// 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
)
// A Type is a Mach-O file type, either an object or an executable.
type Type uint32
const (
TypeObj Type = 1
TypeExec Type = 2
)
// A Cpu is a Mach-O cpu type.
type Cpu uint32
const (
Cpu386 Cpu = 7
CpuAmd64 Cpu = Cpu386 + 1<<24
)
var cpuStrings = []intName{
{uint32(Cpu386), "Cpu386"},
{uint32(CpuAmd64), "CpuAmd64"},
}
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 Section32 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)
}
func flagName(i uint32, names []intName, goSyntax bool) string {
s := ""
for _, n := range names {
if n.i&i == n.i {
if len(s) > 0 {
s += "+"
}
if goSyntax {
s += "macho."
}
s += n.s
i -= n.i
}
}
if len(s) == 0 {
return "0x" + strconv.FormatUint(uint64(i), 16)
}
if i != 0 {
s += "+0x" + strconv.FormatUint(uint64(i), 16)
}
return s
}
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