}
	if buildcfg.FramePointerEnabled && s.f.Config.FPReg >= 0 {
		s.allocatable &^= 1 << uint(s.f.Config.FPReg)
	}
	if s.f.Config.LinkReg != -1 {
		if isLeaf(f) {
			// Leaf functions don't save/restore the link register.
			s.allocatable &^= 1 << uint(s.f.Config.LinkReg)
		}
	}
	if s.f.Config.ctxt.Flag_dynlink {
		switch s.f.Config.arch {
		case "386":
			// nothing to do.

		ops:             S390Xops,
		blocks:          S390Xblocks,
		regnames:        regNamesS390X,
		gpregmask:       gp,
		fpregmask:       fp,
		framepointerreg: -1, // not used
		linkreg:         int8(num["R14"]),
		imports: []string{
			"cmd/internal/obj/s390x",
		},
	})

		ParamFloatRegNames: "F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 F13 F14 F15",
		gpregmask:          gp,
		fpregmask:          fp,
		framepointerreg:    -1, // not used
		linkreg:            int8(num["R30"]),
	})