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macho.go
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// Copyright 2024 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.
// Package macho provides functionalities to handle Mach-O
// beyond the debug/macho package, for the toolchain.
package macho
import (
"debug/macho"
"encoding/binary"
"io"
"unsafe"
)
const (
LC_SEGMENT = 0x1
LC_SYMTAB = 0x2
LC_SYMSEG = 0x3
LC_THREAD = 0x4
LC_UNIXTHREAD = 0x5
LC_LOADFVMLIB = 0x6
LC_IDFVMLIB = 0x7
LC_IDENT = 0x8
LC_FVMFILE = 0x9
LC_PREPAGE = 0xa
LC_DYSYMTAB = 0xb
LC_LOAD_DYLIB = 0xc
LC_ID_DYLIB = 0xd
LC_LOAD_DYLINKER = 0xe
LC_ID_DYLINKER = 0xf
LC_PREBOUND_DYLIB = 0x10
LC_ROUTINES = 0x11
LC_SUB_FRAMEWORK = 0x12
LC_SUB_UMBRELLA = 0x13
LC_SUB_CLIENT = 0x14
LC_SUB_LIBRARY = 0x15
LC_TWOLEVEL_HINTS = 0x16
LC_PREBIND_CKSUM = 0x17
LC_LOAD_WEAK_DYLIB = 0x80000018
LC_SEGMENT_64 = 0x19
LC_ROUTINES_64 = 0x1a
LC_UUID = 0x1b
LC_RPATH = 0x8000001c
LC_CODE_SIGNATURE = 0x1d
LC_SEGMENT_SPLIT_INFO = 0x1e
LC_REEXPORT_DYLIB = 0x8000001f
LC_LAZY_LOAD_DYLIB = 0x20
LC_ENCRYPTION_INFO = 0x21
LC_DYLD_INFO = 0x22
LC_DYLD_INFO_ONLY = 0x80000022
LC_LOAD_UPWARD_DYLIB = 0x80000023
LC_VERSION_MIN_MACOSX = 0x24
LC_VERSION_MIN_IPHONEOS = 0x25
LC_FUNCTION_STARTS = 0x26
LC_DYLD_ENVIRONMENT = 0x27
LC_MAIN = 0x80000028
LC_DATA_IN_CODE = 0x29
LC_SOURCE_VERSION = 0x2A
LC_DYLIB_CODE_SIGN_DRS = 0x2B
LC_ENCRYPTION_INFO_64 = 0x2C
LC_LINKER_OPTION = 0x2D
LC_LINKER_OPTIMIZATION_HINT = 0x2E
LC_VERSION_MIN_TVOS = 0x2F
LC_VERSION_MIN_WATCHOS = 0x30
LC_VERSION_NOTE = 0x31
LC_BUILD_VERSION = 0x32
LC_DYLD_EXPORTS_TRIE = 0x80000033
LC_DYLD_CHAINED_FIXUPS = 0x80000034
)
// LoadCmd is macho.LoadCmd with its length, which is also
// the load command header in the Mach-O file.
type LoadCmd struct {
Cmd macho.LoadCmd
Len uint32
}
type LoadCmdReader struct {
offset, next int64
f io.ReadSeeker
order binary.ByteOrder
}
func NewLoadCmdReader(f io.ReadSeeker, order binary.ByteOrder, nextOffset int64) LoadCmdReader {
return LoadCmdReader{next: nextOffset, f: f, order: order}
}
func (r *LoadCmdReader) Next() (LoadCmd, error) {
var cmd LoadCmd
r.offset = r.next
if _, err := r.f.Seek(r.offset, 0); err != nil {
return cmd, err
}
if err := binary.Read(r.f, r.order, &cmd); err != nil {
return cmd, err
}
r.next = r.offset + int64(cmd.Len)
return cmd, nil
}
func (r LoadCmdReader) ReadAt(offset int64, data interface{}) error {
if _, err := r.f.Seek(r.offset+offset, 0); err != nil {
return err
}
return binary.Read(r.f, r.order, data)
}
func (r LoadCmdReader) Offset() int64 { return r.offset }
type LoadCmdUpdater struct {
LoadCmdReader
}
func NewLoadCmdUpdater(f io.ReadWriteSeeker, order binary.ByteOrder, nextOffset int64) LoadCmdUpdater {
return LoadCmdUpdater{NewLoadCmdReader(f, order, nextOffset)}
}
func (u LoadCmdUpdater) WriteAt(offset int64, data interface{}) error {
if _, err := u.f.Seek(u.offset+offset, 0); err != nil {
return err
}
return binary.Write(u.f.(io.Writer), u.order, data)
}
func FileHeaderSize(f *macho.File) int64 {
offset := int64(unsafe.Sizeof(f.FileHeader))
if is64bit := f.Magic == macho.Magic64; is64bit {
// mach_header_64 has one extra uint32.
offset += 4
}
return offset
}