98 lines
2.5 KiB
Go
98 lines
2.5 KiB
Go
// Copyright 2018 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package symbol_inject
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import (
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"debug/macho"
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"fmt"
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"io"
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"sort"
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"strings"
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)
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func machoSymbolsFromFile(r io.ReaderAt) (*File, error) {
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machoFile, err := macho.NewFile(r)
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if err != nil {
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return nil, cantParseError{err}
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}
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return extractMachoSymbols(machoFile)
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}
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func extractMachoSymbols(machoFile *macho.File) (*File, error) {
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symbols := machoFile.Symtab.Syms
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sort.SliceStable(symbols, func(i, j int) bool {
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if symbols[i].Sect != symbols[j].Sect {
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return symbols[i].Sect < symbols[j].Sect
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}
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return symbols[i].Value < symbols[j].Value
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})
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file := &File{}
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for _, section := range machoFile.Sections {
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file.Sections = append(file.Sections, &Section{
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Name: section.Name,
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Addr: section.Addr,
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Offset: uint64(section.Offset),
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Size: section.Size,
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})
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}
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for _, symbol := range symbols {
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if symbol.Sect > 0 {
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section := file.Sections[symbol.Sect-1]
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file.Symbols = append(file.Symbols, &Symbol{
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// symbols in macho files seem to be prefixed with an underscore
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Name: strings.TrimPrefix(symbol.Name, "_"),
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// MachO symbol value is virtual address of the symbol, convert it to offset into the section.
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Addr: symbol.Value - section.Addr,
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// MachO symbols don't have size information.
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Size: 0,
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Section: section,
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})
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}
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}
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return file, nil
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}
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func dumpMachoSymbols(r io.ReaderAt) error {
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machoFile, err := macho.NewFile(r)
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if err != nil {
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return cantParseError{err}
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}
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fmt.Println("&macho.File{")
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fmt.Println("\tSections: []*macho.Section{")
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for _, section := range machoFile.Sections {
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fmt.Printf("\t\t&macho.Section{SectionHeader: %#v},\n", section.SectionHeader)
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}
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fmt.Println("\t},")
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fmt.Println("\tSymtab: &macho.Symtab{")
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fmt.Println("\t\tSyms: []macho.Symbol{")
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for _, symbol := range machoFile.Symtab.Syms {
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fmt.Printf("\t\t\t%#v,\n", symbol)
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}
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fmt.Println("\t\t},")
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fmt.Println("\t},")
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fmt.Println("}")
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return nil
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}
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