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
}