type specialsIter struct {
	pprev **special
	s     *special
}

func newSpecialsIter(span *mspan) specialsIter {
	return specialsIter{&span.specials, span.specials}
}

func (i *specialsIter) valid() bool {
	return i.s != nil
}

func (i *specialsIter) next() {
	i.pprev = &i.s.next
	i.s = *i.pprev
}

				}
			}

			s.Grow(p.Pc + int64(m))
			copy(s.P[p.Pc:], ab.Bytes())
			// If there was padding, remember it.
			if pPrev != nil && !ctxt.IsAsm && c > c0 {
				nops = append(nops, nopPad{p: pPrev, n: c - c0})
			}
			c += int32(m)
			pPrev = p
		}

		n++
		if n > 1000 {
			ctxt.Diag("span must be looping")
			log.Fatalf("loop")
		}
		if !reAssemble {
			break

		// won't write to it when calling VDSO code.
		mp.gsignal = nil
	}

	// Remove m from allm.
	lock(&sched.lock)
	for pprev := &allm; *pprev != nil; pprev = &(*pprev).alllink {
		if *pprev == mp {
			*pprev = mp.alllink
			goto found
		}
	}
	throw("m not found in allm")
found:
	// Events must not be traced after this point.