switch r.Size {
		case 4:
			out.Write8(uint8(elf.R_MIPS_32))
		case 8:
			out.Write8(uint8(elf.R_MIPS_64))
		default:
			return false
		}
	case objabi.R_ADDRMIPS:
		out.Write8(uint8(elf.R_MIPS_LO16))
	case objabi.R_ADDRMIPSU:
		out.Write8(uint8(elf.R_MIPS_HI16))
	case objabi.R_ADDRMIPSTLS:
		out.Write8(uint8(elf.R_MIPS_TLS_TPREL_LO16))
		if ctxt.Target.IsOpenbsd() {

				out.Write32(uint32(elf.R_ARM_CALL) | uint32(elfsym)<<8)
			} else {
				out.Write32(uint32(elf.R_ARM_JUMP24) | uint32(elfsym)<<8)
			}
		} else {
			return false
		}
	case objabi.R_TLS_LE:
		out.Write32(uint32(elf.R_ARM_TLS_LE32) | uint32(elfsym)<<8)
	case objabi.R_TLS_IE:
		out.Write32(uint32(elf.R_ARM_TLS_IE32) | uint32(elfsym)<<8)
	case objabi.R_GOTPCREL:

				out.Write64(uint64(elf.R_X86_64_PLT32) | uint64(elfsym)<<32)
			} else {
				out.Write64(uint64(elf.R_X86_64_PC32) | uint64(elfsym)<<32)
			}
		} else {
			return false
		}
	case objabi.R_GOTPCREL:
		if siz == 4 {
			out.Write64(uint64(elf.R_X86_64_GOTPCREL) | uint64(elfsym)<<32)
		} else {
			return false
		}
	}

	}
}

func hasDynTag(f *elf.File, tag elf.DynTag) bool {
	ds := f.SectionByType(elf.SHT_DYNAMIC)
	if ds == nil {
		return false
	}
	d, err := ds.Data()
	if err != nil {
		return false
	}
	for len(d) > 0 {
		var t elf.DynTag
		switch f.Class {
		case elf.ELFCLASS32:
			t = elf.DynTag(f.ByteOrder.Uint32(d[0:4]))
			d = d[8:]
		case elf.ELFCLASS64:

		{0x10, nil},
		{0x400611, nil},
	}
	testRanges(t, "testdata/line-gcc.elf", want)

	want = []wantRange{
		{0x401122, [][2]uint64{{0x401122, 0x401166}}},
		{0x401165, [][2]uint64{{0x401122, 0x401166}}},
		{0x401166, [][2]uint64{{0x401166, 0x401179}}},
	}
	testRanges(t, "testdata/line-gcc-dwarf5.elf", want)

	want = []wantRange{
		{0x401130, [][2]uint64{{0x401130, 0x40117e}}},

		case ".strtab":
			want = elf.SHT_STRTAB
		case ".init_array":
			want = elf.SHT_INIT_ARRAY
		case ".fini_array":
			want = elf.SHT_FINI_ARRAY
		case ".preinit_array":
			want = elf.SHT_PREINIT_ARRAY
		}
		if want != elf.SHT_NULL && sec.Type != want {
			t.Errorf("%s: incorrect section type in elf file at %d for section %q: got %v want %v", arname, off, sec.Name, sec.Type, want)
		}
	}
}

resources, or cause panics.
*/
package elf

import (
	"bytes"
	"compress/zlib"
	"debug/dwarf"
	"encoding/binary"
	"errors"
	"fmt"
	"internal/saferio"
	"internal/zstd"
	"io"
	"os"
	"strings"
	"unsafe"
)

// TODO: error reporting detail

/*
 * Internal ELF representation
 */

// A FileHeader represents an ELF file header.
type FileHeader struct {
	Class      Class

func (x *elfExe) DataStart() (uint64, uint64) {
	for _, s := range x.f.Sections {
		if s.Name == ".go.buildinfo" {
			return s.Addr, s.Size
		}
	}
	for _, p := range x.f.Progs {
		if p.Type == elf.PT_LOAD && p.Flags&(elf.PF_X|elf.PF_W) == elf.PF_W {
			return p.Vaddr, p.Memsz
		}
	}
	return 0, 0
}

// peExe is the PE (Windows Portable Executable) implementation of the exe interface.
type peExe struct {
	f *pe.File

	createHeadersOnce(t)

	f, err := elf.Open(libgoname)
	if err != nil {
		t.Fatalf("elf.Open failed: %v", err)
	}
	defer f.Close()

	ds := f.SectionByType(elf.SHT_DYNAMIC)
	if ds == nil {
		t.Fatalf("no SHT_DYNAMIC section")
	}
	d, err := ds.Data()
	if err != nil {
		t.Fatalf("can't read SHT_DYNAMIC contents: %v", err)
	}
	for len(d) > 0 {
		var tag elf.DynTag
		switch f.Class {

		return elfexec.FindTextProgHeader(ef), nil
	}

	// Fetch all the loadable segments.
	var phdrs []elf.ProgHeader
	for i := range ef.Progs {
		if ef.Progs[i].Type == elf.PT_LOAD {
			phdrs = append(phdrs, ef.Progs[i].ProgHeader)
		}
	}
	// Some ELF files don't contain any loadable program segments, e.g. .ko
	// kernel modules. It's not an error to have no header in such cases.