Subversion Repositories openrisc

// 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

}