127 lines
2.9 KiB
Go
127 lines
2.9 KiB
Go
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// Copyright 2019 The UNICORE Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file
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//
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// Author: Gaulthier Gain <gaulthier.gain@uliege.be>
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package elf64core
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import (
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"bytes"
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"debug/elf"
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"encoding/binary"
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"fmt"
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"os"
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"text/tabwriter"
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u "tools/srcs/common"
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)
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type RelaTables struct {
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nbEntries int
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name string
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dataRela []*dataRela
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}
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type dataRela struct {
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name *string
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elf64Rela Elf64Rela
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}
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type Elf64Rela struct {
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Offset uint64
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Type uint32
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SymbolIndex uint32
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Addend int64
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}
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func (elfFile *ELF64File) addRela(index int, relas []Elf64Rela) error {
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var relocationTables RelaTables
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relocationTables.nbEntries = len(relas)
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relocationTables.name = elfFile.SectionsTable.DataSect[index].Name
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relocationTables.dataRela = make([]*dataRela, relocationTables.nbEntries)
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for i := range relas {
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relocationTables.dataRela[i] = &dataRela{
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elf64Rela: relas[i],
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name: nil,
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}
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}
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elfFile.RelaTables = append(elfFile.RelaTables, relocationTables)
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return nil
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}
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func (elfFile *ELF64File) parseRelocations(index int) error {
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content, err := elfFile.GetSectionContent(uint16(index))
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if err != nil {
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return fmt.Errorf("failed reading relocation table: %s", err)
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}
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rela := make([]Elf64Rela, len(content)/binary.Size(Elf64Rela{}))
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if err := binary.Read(bytes.NewReader(content),
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elfFile.Endianness, rela); err != nil {
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return err
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}
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if err := elfFile.addRela(index, rela); err != nil {
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return err
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}
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return nil
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}
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func (elfFile *ELF64File) resolveRelocSymbolsName() error {
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for _, table := range elfFile.RelaTables {
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for _, s := range table.dataRela {
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t := 0
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if s.elf64Rela.Type == uint32(elf.R_X86_64_JMP_SLOT) ||
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s.elf64Rela.Type == uint32(elf.R_X86_64_GLOB_DAT) ||
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s.elf64Rela.Type == uint32(elf.R_X86_64_COPY) &&
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len(elfFile.SymbolsTables) > 1 {
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t++
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}
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symName, err := elfFile.SymbolsTables[t].getSymbolName(s.elf64Rela.SymbolIndex)
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if err != nil {
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return err
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}
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s.name = &symName
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}
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}
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return nil
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}
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func (table *RelaTables) displayRelocations(w *tabwriter.Writer) {
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_, _ = fmt.Fprintf(w, "\nRelocation section '%s' contains %d entries:\n",
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table.name, table.nbEntries)
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_, _ = fmt.Fprintln(w, "Offset\tInfo\tType\tValue")
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for _, r := range table.dataRela {
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_, _ = fmt.Fprintf(w, "%.6x\t%.6d\t%s\t%s %x\n",
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r.elf64Rela.Offset, r.elf64Rela.SymbolIndex,
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rx86_64Strings[r.elf64Rela.Type], *r.name,
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r.elf64Rela.Addend)
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}
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}
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func (elfFile *ELF64File) DisplayRelocationTables() {
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if len(elfFile.RelaTables) == 0 {
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u.PrintWarning("Relocation table(s) are empty")
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return
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}
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w := new(tabwriter.Writer)
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w.Init(os.Stdout, 0, 8, 0, '\t', 0)
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fmt.Println("-----------------------------------------------------------------------")
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for _, table := range elfFile.RelaTables {
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table.displayRelocations(w)
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}
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_ = w.Flush()
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}
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