switch rt := r.Type(); rt {
		default:
			if !target.IsAIX() {
				return val, nExtReloc, false
			}
		case objabi.R_POWER_TLS, objabi.R_POWER_TLS_IE_PCREL34, objabi.R_POWER_TLS_LE_TPREL34, objabi.R_ADDRPOWER_GOT_PCREL34:
			nExtReloc = 1
			return val, nExtReloc, true
		case objabi.R_POWER_TLS_LE, objabi.R_POWER_TLS_IE:
			if target.IsAIX() && rt == objabi.R_POWER_TLS_LE {

	//
	// On other platforms, the user address space is contiguous
	// and starts at 0, so no offset is necessary.
	arenaBaseOffset = 0xffff800000000000*goarch.IsAmd64 + 0x0a00000000000000*goos.IsAix
	// A typed version of this constant that will make it into DWARF (for viewcore).
	arenaBaseOffsetUintptr = uintptr(arenaBaseOffset)

	// Max number of threads to run garbage collection.

	ldr := ctxt.loader
	s := ldr.Lookup(a, 0)
	if s == 0 {
		Errorf(nil, "missing entry symbol %q", a)
		return 0
	}
	st := ldr.SymType(s)
	if st == 0 {
		return *FlagTextAddr
	}
	if !ctxt.IsAIX() && st != sym.STEXT {
		ldr.Errorf(s, "entry not text")
	}
	return ldr.SymValue(s)
}

func (ctxt *Link) callgraph() {
	if !*FlagC {
		return
	}

	ldr := ctxt.loader