prologue.Spadj = int32(stacksize)

		prologue = ctxt.EndUnsafePoint(prologue, newprog, -1)

		// On Linux, in a cgo binary we may get a SIGSETXID signal early on
		// before the signal stack is set, as glibc doesn't allow us to block
		// SIGSETXID. So a signal may land on the current stack and clobber
		// the content below the SP. We store the LR again after the SP is
		// decremented.
		prologue = obj.Appendp(prologue, newprog)