var gsignalStack gsignalStack
	setStack := adjustSignalStack(sig, gp.m, &gsignalStack)
	if setStack {
		gp.m.gsignal.stktopsp = getcallersp()
	}

	if gp.stackguard0 == stackFork {
		signalDuringFork(sig)
	}

	c.fixsigcode(sig)
	sighandler(sig, info, ctx, gp)
	setg(gp)
	if setStack {
		restoreGsignalStack(&gsignalStack)
	}
}

}

func setProcessCPUProfiler(hz int32) {
}

func setThreadCPUProfiler(hz int32) {
	// TODO: Enable profiling interrupts.
	getg().m.profilehz = hz
}

// gsignalStack is unused on Plan 9.

// dropm is called when a cgo callback has called needm but is now
// done with the callback and returning back into the non-Go thread.
//
// The main expense here is the call to signalstack to release the
// m's signal stack, and then the call to needm on the next callback
// from this thread. It is tempting to try to save the m for next time,
// which would eliminate both these costs, but there might not be

	// Fields not known to debuggers.
	procid        uint64            // for debuggers, but offset not hard-coded
	gsignal       *g                // signal-handling g
	goSigStack    gsignalStack      // Go-allocated signal handling stack
	sigmask       sigset            // storage for saved signal mask
	tls           [tlsSlots]uintptr // thread-local storage (for x86 extern register)
	mstartfn      func()