memset(&sa, 0, sizeof(sa));
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
	sa.sa_sigaction = forwardSignal;

	if (sigaction(SIGSEGV, &sa, &prev_sa) != 0) {
		perror("failed to register SEGV forwarder");
		exit(EXIT_FAILURE);
	}
}
*/
import "C"

func main() {
	C.registerSegvFowarder()

	defer func() {
		recover()
	}()
	var nilp *int
	*nilp = 42

	}
	sects := []struct {
		xcoffSect *XcoffScnHdr64
		segs      []*sym.Segment
	}{
		{f.sectText, []*sym.Segment{&Segtext}},
		{f.sectData, []*sym.Segment{&Segrelrodata, &Segdata}},
	}
	for _, s := range sects {
		s.xcoffSect.Srelptr = uint64(ctxt.Out.Offset())
		n := uint32(0)
		for _, seg := range s.segs {
			for _, sect := range seg.Sections {
				if sect.Name == ".text" {

}

func elfphload(seg *sym.Segment) *ElfPhdr {
	ph := newElfPhdr()
	ph.Type = elf.PT_LOAD
	if seg.Rwx&4 != 0 {
		ph.Flags |= elf.PF_R
	}
	if seg.Rwx&2 != 0 {
		ph.Flags |= elf.PF_W
	}
	if seg.Rwx&1 != 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

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					Exitf("bad segment rounding (Vaddr=%#x Fileoff=%#x FlagRound=%#x)", seg.Vaddr, seg.Fileoff, *FlagRound)
				}
			case objabi.Hwindows:
				seg.Fileoff = prev.Fileoff + uint64(Rnd(int64(prev.Filelen), PEFILEALIGN))
			case objabi.Hplan9:
				seg.Fileoff = prev.Fileoff + prev.Filelen
			}
		}
		if seg != &Segdata {
			// Link.address already set Segdata.Filelen to

		{"/", []string{"/"}},
		{"/a/%62/c", []string{"a", "b", "c"}},
		{"/a%2Fb%2fc", []string{"a/b/c"}},
	} {
		var got []string
		rest := test.in
		for len(rest) > 0 {
			var seg string
			seg, rest = firstSegment(rest)
			got = append(got, seg)
		}
		if !slices.Equal(got, test.want) {
			t.Errorf("%q: got %v, want %v", test.in, got, test.want)
		}
	}
}

// TODO: test host and method
var testTree *routingNode

						ret += s.Size
					}
				}
				// also skip gaps between PT_LOAD segments
				var prev *elf.Prog
				for _, seg := range ef.Progs {
					if seg.Type != elf.PT_LOAD {
						continue
					}
					if prev != nil {
						ret += seg.Off - prev.Off - prev.Filesz
					}
					prev = seg
				}
				return ret
			}

			extraexe := extrasize(elfexe)
			extrapie := extrasize(elfpie)

// and file offset provided in segment seg.
func (sect *peSection) checkSegment(seg *sym.Segment) {
	if seg.Vaddr-uint64(PEBASE) != uint64(sect.virtualAddress) {
		Errorf(nil, "%s.VirtualAddress = %#x, want %#x", sect.name, uint64(int64(sect.virtualAddress)), uint64(int64(seg.Vaddr-uint64(PEBASE))))
		errorexit()
	}
	if seg.Fileoff != uint64(sect.pointerToRawData) {

			}
			panic("cannot find main.f on stack")
		}
	}()
	f(20)
}

func f(n int) {
	if n > 0 {
		f(n - 1)
	}
	var f struct {
		x uintptr
	}

	// We want to force a seg fault, to get a crash at a PC value != 0.
	// Not all systems make the data section non-executable.
	ill := make([]byte, 64)
	switch runtime.GOARCH {
	case "386", "amd64":

	j := 0
	d := i.multiSeg
	for j < len(d) {
		info := i.rb.f.info(input{bytes: d}, j)
		if info.BoundaryBefore() {
			i.rb.compose()
			seg := i.buf[:i.rb.flushCopy(i.buf[:])]
			i.rb.insertUnsafe(input{bytes: d}, j, info)
			i.multiSeg = d[j+int(info.size):]
			return seg
		}
		i.rb.insertUnsafe(input{bytes: d}, j, info)
		j += int(info.size)
	}
	i.multiSeg = nil
	i.next = nextComposed