// The .xdata entries have very low cardinality
	// as it only contains frame pointer operations,
	// which are very similar across functions.
	// These are referenced by .pdata entries using
	// an RVA, so it is possible, and binary-size wise,
	// to deduplicate .xdata entries.
	uwcache := make(map[string]int64) // aux symbol name --> .xdata offset
	for _, s := range ctxt.Textp {
		if fi := ldr.FuncInfo(s); !fi.Valid() {

	buf.write8(uint8(movbp.Link.Pc))
	buf.writecode(UWOP_SET_FPREG, 0)

	buf.write8(uint8(pushbp.Link.Pc))
	buf.writecode(UWOP_PUSH_NONVOL, SEH_REG_BP)

	// The following 4 bytes reference the RVA of the exception handler.
	// The value is set to 0 for now, if an exception handler is needed,
	// it will be updated later with a R_PEIMAGEOFF relocation to the
	// exception handler.
	buf.write32(0)

	case "rva20u64":
		return 20
	case "rva22u64":
		return 22
	}
	Error = fmt.Errorf("invalid GORISCV64: must be rva20u64, rva22u64")
	v := defaultGORISCV64[len("rva"):]
	i := strings.IndexFunc(v, func(r rune) bool {
		return r < '0' || r > '9'
	})
	year, _ := strconv.Atoi(v[:i])
	return year
}

type gowasmFeatures struct {
	SatConv bool
	SignExt bool
}

	GOPPC64, goPPC64Changed     = EnvOrAndChanged("GOPPC64", fmt.Sprintf("%s%d", "power", buildcfg.GOPPC64))
	GORISCV64, goRISCV64Changed = EnvOrAndChanged("GORISCV64", fmt.Sprintf("rva%du64", buildcfg.GORISCV64))
	GOWASM, goWASMChanged       = EnvOrAndChanged("GOWASM", fmt.Sprint(buildcfg.GOWASM))

	GOPROXY, GOPROXYChanged     = EnvOrAndChanged("GOPROXY", "")

				//
				// In external linking mode, the external linker can't resolve them as
				// external symbols. But we are lucky that they have "." in their name,
				// so the external linker see them as Forwarder RVA exports. See:
				//
				//  - https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#export-address-table

				if ldr.SymSect(s).Seg == &Segdata {
					Xcoffadddynrel(target, ldr, syms, s, r, ri)
				}
			}

			o = ldr.SymValue(rs) + r.Add()
			if rt == objabi.R_PEIMAGEOFF {
				// The R_PEIMAGEOFF offset is a RVA, so subtract
				// the base address for the executable.
				o -= PEBASE
			}

			// On amd64, 4-byte offsets will be sign-extended, so it is impossible to