func (rel Reloc) SetType(t objabi.RelocType) { rel.Reloc.SetType(uint16(t)) }
func (rel Reloc) Sym() Sym                   { return rel.l.resolve(rel.r, rel.Reloc.Sym()) }
func (rel Reloc) SetSym(s Sym)               { rel.Reloc.SetSym(goobj.SymRef{PkgIdx: 0, SymIdx: uint32(s)}) }
func (rel Reloc) IsMarker() bool             { return rel.Siz() == 0 }

// Aux holds a "handle" to access an aux symbol record from an
// object file.
type Aux struct {
	*goobj.Aux

					// This call goes through the PLT, generate and call through a PLT stub.
					if sym, firstUse := genpltstub(ctxt, ldr, r, i, s); firstUse {
						stubs = append(stubs, sym)
					}

				case sym.SXREF:
					// Is this an ELF ABI defined function which is (in practice)
					// generated by the linker to save/restore callee save registers?
					// These are defined similarly for both PPC64 ELF and ELFv2.

					ldr.Errorf(s, "should not be bss (size=%d type=%v special=%v)", len(data), ldr.SymType(s), ldr.AttrSpecial(s))
				}
				putaixsym(ctxt, s, BSSSym)
			}

		case st >= sym.SELFRXSECT && st < sym.SXREF: // data sections handled in dodata
			if ldr.AttrReachable(s) {
				putaixsym(ctxt, s, DataSym)
			}

		case st == sym.SUNDEFEXT:
			putaixsym(ctxt, s, UndefinedSym)

		case st == sym.SDYNIMPORT:

		// Check it here to be sure.
		if lib.Fingerprint.IsZero() { // Not yet imported. Update its fingerprint.
			lib.Fingerprint = fingerprint
		}
		checkFingerprint(lib, fingerprint, lib.Srcref, lib.Fingerprint)
	}

	addImports(ctxt, lib, pn)
	return nil
}

// symbolsAreUnresolved scans through the loader's list of unresolved