err = syscall.FlushFileBuffers(syscall.Handle(out.f.Fd()))
	if err != nil {
		Exitf("FlushFileBuffers failed: %v", err)
	}
	err = syscall.UnmapViewOfFile(uintptr(unsafe.Pointer(&out.buf[0])))
	out.buf = nil
	if err != nil {
		Exitf("UnmapViewOfFile failed: %v", err)
	}

				ctxt.Logf("skipping libgcc file: %v\n", err)
			}
			return
		}
		Exitf("cannot open file %s: %v", name, err)
	}
	defer f.Close()

	var magbuf [len(ARMAG)]byte
	if _, err := io.ReadFull(f, magbuf[:]); err != nil {
		Exitf("file %s too short", name)
	}

	if string(magbuf[:]) != ARMAG {
		Exitf("%s is not an archive file", name)
	}

	var arhdr ArHdr

	argv0 := argv[0]
	if filepath.Base(argv0) == argv0 {
		argv0, err = exec.LookPath(argv0)
		if err != nil {
			Exitf("cannot find %s: %v", argv[0], err)
		}
	}
	if ctxt.Debugvlog != 0 {
		ctxt.Logf("invoking archiver with syscall.Exec()\n")
	}
	err = syscall.Exec(argv0, argv, os.Environ())
	if err != nil {
		Exitf("running %s failed: %v", argv[0], err)
	}

		atExitFuncs[i]()
	}
	atExitFuncs = nil
}

// Exit exits with code after executing all atExitFuncs.
func Exit(code int) {
	runAtExitFuncs()
	os.Exit(code)
}

// Exitf logs an error message then calls Exit(2).
func Exitf(format string, a ...interface{}) {
	fmt.Fprintf(os.Stderr, os.Args[0]+": "+format+"\n", a...)
	nerrors++
	if *flagH {
		panic("error")
	}
	Exit(2)
}

		ld.HEADR = ld.ELFRESERVE
		if *ld.FlagRound == -1 {
			*ld.FlagRound = 0x10000
		}
		if *ld.FlagTextAddr == -1 {
			*ld.FlagTextAddr = ld.Rnd(0x10000, *ld.FlagRound) + int64(ld.HEADR)
		}
	default:
		ld.Exitf("unknown -H option: %v", ctxt.HeadType)
	}

			}
		}
	}

	switch ctxt.LinkMode {
	case LinkInternal:
		if extNeeded {
			Exitf("internal linking requested %sbut external linking required: %s", via, extReason)
		}
	case LinkExternal:
		switch {
		case buildcfg.GOARCH == "ppc64" && buildcfg.GOOS == "linux":
			Exitf("external linking not supported for %s/ppc64", buildcfg.GOOS)
		}
	}

			// .dynamic section.
			DynamicReadOnly: true,
		},
	}

	return arch, theArch
}

func archinit(ctxt *ld.Link) {
	switch ctxt.HeadType {
	default:
		ld.Exitf("unknown -H option: %v", ctxt.HeadType)
	case objabi.Hlinux: /* mips elf */
		ld.Elfinit(ctxt)
		ld.HEADR = ld.ELFRESERVE
		if *ld.FlagRound == -1 {
			*ld.FlagRound = 0x10000
		}
		if *ld.FlagTextAddr == -1 {

			Reloc1:    elfreloc1,
			RelocSize: 24,
			SetupPLT:  elfsetupplt,
		},
	}

	return arch, theArch
}

func archinit(ctxt *ld.Link) {
	switch ctxt.HeadType {
	default:
		ld.Exitf("unknown -H option: %v", ctxt.HeadType)
	case objabi.Hlinux: /* loong64 elf */
		ld.Elfinit(ctxt)
		ld.HEADR = ld.ELFRESERVE
		if *ld.FlagRound == -1 {
			*ld.FlagRound = 0x10000
		}
		if *ld.FlagTextAddr == -1 {

			if err != nil {
				Exitf("cannot reopen %s: %v", h.pn, err)
			}
			defer f.Close()
			if _, err := f.Seek(h.off, 0); err != nil {
				Exitf("cannot seek %s: %v", h.pn, err)
			}

			w, err := os.Create(dst)
			if err != nil {
				Exitf("cannot create %s: %v", dst, err)
			}
			if _, err := io.CopyN(w, f, h.length); err != nil {
				Exitf("cannot write %s: %v", dst, err)
			}

		// area.
		if err != syscall.ENOTSUP && err != syscall.EPERM && err != errNoFallocate {
			return err
		}
	}
	err = out.f.Truncate(int64(filesize))
	if err != nil {
		Exitf("resize output file failed: %v", err)
	}
	out.buf, err = syscall.Mmap(int(out.f.Fd()), 0, int(filesize), syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED|syscall.MAP_FILE)
	if err != nil {
		return err
	}