rs := r.Sym()
	if target.IsExternal() {
		switch r.Type() {
		case objabi.R_CALLARM:
			// set up addend for eventual relocation via outer symbol.
			_, off := ld.FoldSubSymbolOffset(ldr, rs)
			xadd := int64(signext24(r.Add()&0xffffff))*4 + off
			if xadd/4 > 0x7fffff || xadd/4 < -0x800000 {
				ldr.Errorf(s, "direct call too far %d", xadd/4)
			}

			objabi.R_ARM64_PCREL_LDST16,
			objabi.R_ARM64_PCREL_LDST32,
			objabi.R_ARM64_PCREL_LDST64,
			objabi.R_ADDRARM64:

			// set up addend for eventual relocation via outer symbol.
			rs, off := ld.FoldSubSymbolOffset(ldr, rs)
			xadd := r.Add() + off
			rst := ldr.SymType(rs)
			if rst != sym.SHOSTOBJ && rst != sym.SDYNIMPORT && ldr.SymSect(rs) == nil {
				ldr.Errorf(s, "missing section for %s", ldr.SymName(rs))
			}