defer fi.Close()

	elfFile, err := elf.NewFile(fi)
	if err != nil {
		t.Skip("The system may not support ELF, skipped.")
	}
	defer elfFile.Close()

	// List of interesting sections. Here "interesting" means progbits/dynamic
	// and loadable (has an address), nonzero size.
	secs := []*elf.Section{}
	for _, s := range elfFile.Sections {
		if s.Type != elf.SHT_PROGBITS && s.Type != elf.SHT_DYNAMIC {
			continue
		}

		$2 ~ /^E([ABCD]X|[BIS]P|[SD]I|S|FL)$/ {next}  # 386 registers
		$2 ~ /^(SIGEV_|SIGSTKSZ|SIGRT(MIN|MAX))/ {next}
		$2 ~ /^(SCM_SRCRT)$/ {next}
		$2 ~ /^(MAP_FAILED)$/ {next}
		$2 ~ /^ELF_.*$/ {next}# <asm/elf.h> contains ELF_ARCH, etc.

		$2 ~ /^EXTATTR_NAMESPACE_NAMES/ ||
		$2 ~ /^EXTATTR_NAMESPACE_[A-Z]+_STRING/ {next}

		$2 !~ /^ECCAPBITS/ &&
		$2 !~ /^ETH_/ &&
		$2 !~ /^EPROC_/ &&

// prologue.
func isNOTOCfunc(name string) bool {
	switch {
	case name == "runtime.duffzero":
		return true
	case name == "runtime.duffcopy":
		return true
	case strings.HasPrefix(name, "runtime.elf_"):
		return true
	default:
		return false
	}
}

// Try converting FMOVD/FMOVS to XXSPLTIDP. If it is converted,
// return true.
func convertFMOVtoXXSPLTIDP(p *obj.Prog) bool {

			return errorf("elf object but not 386")
		}

	case sys.PPC64:
		if mach != elf.EM_PPC64 || class != elf.ELFCLASS64 {
			return errorf("elf object but not ppc64")
		}

	case sys.RISCV64:
		if mach != elf.EM_RISCV || class != elf.ELFCLASS64 {
			return errorf("elf object but not riscv64")
		}

	case sys.S390X:
		if mach != elf.EM_S390 || class != elf.ELFCLASS64 {

		//
		//  https://github.com/riscv-non-isa/riscv-elf-psabi-doc/releases/download/v1.0/riscv-abi.pdf
		//
		var hiRel, loRel elf.R_RISCV
		switch r.Type {
		case objabi.R_RISCV_CALL, objabi.R_RISCV_PCREL_ITYPE:
			hiRel, loRel = elf.R_RISCV_PCREL_HI20, elf.R_RISCV_PCREL_LO12_I
		case objabi.R_RISCV_PCREL_STYPE:
			hiRel, loRel = elf.R_RISCV_PCREL_HI20, elf.R_RISCV_PCREL_LO12_S
		case objabi.R_RISCV_TLS_IE:

// section or nil if the segment cannot be found.
func FindTextProgHeader(f *elf.File) *elf.ProgHeader {
	for _, s := range f.Sections {
		if s.Name == ".text" {
			// Find the LOAD segment containing the .text section.
			for _, p := range f.Progs {
				if p.Type == elf.PT_LOAD && p.Flags&elf.PF_X != 0 && s.Addr >= p.Vaddr && s.Addr < p.Vaddr+p.Memsz {
					return &p.ProgHeader
				}
			}
		}

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

		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.

	flag.Var(&ctxt.BuildMode, "buildmode", "set build `mode`")
	flag.BoolVar(&ctxt.compressDWARF, "compressdwarf", true, "compress DWARF if possible")
	objabi.Flagfn1("B", "add an ELF NT_GNU_BUILD_ID `note` when using ELF; use \"gobuildid\" to generate it from the Go build ID", addbuildinfo)
	objabi.Flagfn1("L", "add specified `directory` to library path", func(a string) { Lflag(ctxt, a) })
	objabi.AddVersionFlag() // -V