// address where the first byte of the segment is loaded
		// (loadSegment.Vaddr). A file offset fx maps to a virtual (symbol) address
		// sx = fx - loadSegment.Off + loadSegment.Vaddr.
		//
		// Thus, a runtime virtual address x maps to a symbol address
		// sx = x - start + offset - loadSegment.Off + loadSegment.Vaddr.
		return start - offset + loadSegment.Off - loadSegment.Vaddr, nil
	}

			f(ctxt, s)
		}
		addr += int64(len(P))
		siz := ldr.SymSize(s)
		if addr < val+siz {
			out.WriteStringPad("", int(val+siz-addr), pad)
			addr = val + siz
		}
		if addr != val+siz {
			ldr.Errorf(s, "phase error: addr=%#x value+size=%#x", addr, val+siz)
			errorexit()
		}
		if val+siz >= eaddr {
			break
		}
	}

	if addr < eaddr {

		msect.align++
	}
	msect.addr = sect.Vaddr
	msect.size = sect.Length

	if sect.Vaddr < sect.Seg.Vaddr+sect.Seg.Filelen {
		// data in file
		if sect.Length > sect.Seg.Vaddr+sect.Seg.Filelen-sect.Vaddr {
			Errorf(nil, "macho cannot represent section %s crossing data and bss", sect.Name)
		}
		msect.off = uint32(sect.Seg.Fileoff + sect.Vaddr - sect.Seg.Vaddr)
	} else {
		msect.off = 0

		ph.Flags |= elf.PF_X
	}
	ph.Vaddr = seg.Vaddr
	ph.Paddr = seg.Vaddr
	ph.Memsz = seg.Length
	ph.Off = seg.Fileoff
	ph.Filesz = seg.Filelen
	ph.Align = uint64(*FlagRound)

	return ph
}

func elfphrelro(seg *sym.Segment) {
	ph := newElfPhdr()
	ph.Type = elf.PT_GNU_RELRO
	ph.Flags = elf.PF_R
	ph.Vaddr = seg.Vaddr
	ph.Paddr = seg.Vaddr
	ph.Memsz = seg.Length

type elfExe struct {
	f *elf.File
}

func (x *elfExe) ReadData(addr, size uint64) ([]byte, error) {
	for _, prog := range x.f.Progs {
		if prog.Vaddr <= addr && addr <= prog.Vaddr+prog.Filesz-1 {
			n := prog.Vaddr + prog.Filesz - addr
			if n > size {
				n = size
			}
			return saferio.ReadDataAt(prog, n, int64(addr-prog.Vaddr))
		}
	}
	return nil, errUnrecognizedFormat
}

		return secs[i].Addr < secs[j].Addr
	})

	// Check to make sure we don't have any overlaps.
	foundOverlap := false
	for i := 0; i < len(secs)-1; i++ {
		for j := i + 1; j < len(secs); j++ {
			s := secs[i]
			sn := secs[j]
			if secOverlaps(s, sn) {
				t.Errorf("unexpected: section %d:%q (addr=%x size=%x) overlaps section %d:%q (addr=%x size=%x)", i, s.Name, s.Addr, s.Size, i+1, sn.Name, sn.Addr, sn.Size)

type functab struct {
	entryoff uint32 // relative to runtime.text
	funcoff  uint32
}

// Mapping information for secondary text sections

type textsect struct {
	vaddr    uintptr // prelinked section vaddr
	end      uintptr // vaddr + section length
	baseaddr uintptr // relocated section address
}

// findfuncbucket is an array of these structures.
// Each bucket represents 4096 bytes of the text segment.

func unpackOps4(p *obj.Prog) (arg0, arg1, arg2, dst *obj.Addr) {
	return &p.From, &p.RestArgs[0].Addr, &p.RestArgs[1].Addr, &p.To
}

// unpackOps5 extracts 5 operands from p.
func unpackOps5(p *obj.Prog) (arg0, arg1, arg2, arg3, dst *obj.Addr) {
	return &p.From, &p.RestArgs[0].Addr, &p.RestArgs[1].Addr, &p.RestArgs[2].Addr, &p.To

				Flags:  ProgFlag(bo.Uint32(phdata[off+unsafe.Offsetof(ph.Flags):])),
				Off:    uint64(bo.Uint32(phdata[off+unsafe.Offsetof(ph.Off):])),
				Vaddr:  uint64(bo.Uint32(phdata[off+unsafe.Offsetof(ph.Vaddr):])),
				Paddr:  uint64(bo.Uint32(phdata[off+unsafe.Offsetof(ph.Paddr):])),
				Filesz: uint64(bo.Uint32(phdata[off+unsafe.Offsetof(ph.Filesz):])),
				Memsz:  uint64(bo.Uint32(phdata[off+unsafe.Offsetof(ph.Memsz):])),

// the elfMapping field is set. It populates the base and isData fields and
// returns an error.
func (f *file) computeBase(addr uint64) error {
	if f == nil || f.m == nil {
		return nil
	}
	if addr < f.m.start || addr >= f.m.limit {
		return fmt.Errorf("specified address %x is outside the mapping range [%x, %x] for file %q", addr, f.m.start, f.m.limit, f.name)
	}
	ef, err := elfOpen(f.name)
	if err != nil {