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cmd/internal/macho: new package for handling mach-o files in toolchain
Currently the linker has some code handling and manipulating Mach-O files. Specifically, it augments the debug/macho package with file offset and length, so the content can be handled or updated easily with the file. Move this code to an internal package, so it can be used by other part of the toolchain, e.g. buildid computation. For #68678. Cq-Include-Trybots: luci.golang.try:gotip-darwin-amd64_14,gotip-darwin-arm64_13 Change-Id: I2311af0a06441b7fd887ca5c6ed9e6fc44670a16 Reviewed-on: https://go-review.googlesource.com/c/go/+/618596 Reviewed-by: Than McIntosh <[email protected]> Reviewed-by: Dmitri Shuralyov <[email protected]> LUCI-TryBot-Result: Go LUCI <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| // 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 | ||
| } | ||
|
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| func NewLoadCmdReader(f io.ReadSeeker, order binary.ByteOrder, nextOffset int64) LoadCmdReader { | ||
| return LoadCmdReader{next: nextOffset, f: f, order: order} | ||
| } | ||
|
|
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| func (r *LoadCmdReader) Next() (LoadCmd, error) { | ||
| var cmd LoadCmd | ||
|
|
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| 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 | ||
| } | ||
|
|
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| 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) | ||
| } | ||
|
|
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| func (r LoadCmdReader) Offset() int64 { return r.offset } | ||
|
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| type LoadCmdUpdater struct { | ||
| LoadCmdReader | ||
| } | ||
|
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| 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 | ||
| } |
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