8673b5b959
Parse the machine-specific symbol tables into a custom symbol table object and use a single function to find the offset and size of the symbol in the custom table. Make the functions to convert a machine-specific symbol table into the custom table also take mocks, and provide functions to dump mocks from real files. Add tests that take the mocks and verify they produce the right offset and size. Test: cmd/symbol_inject/*_test.go Change-Id: I25654032b5017dd13a9a1fe29f8b8826ce5bc82b
97 lines
2.5 KiB
Go
97 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 main
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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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