_SIGTRAP:    {_SigThrow + _SigUnblock, "SIGTRAP: trace trap"},
	_SIGABRT:    {_SigNotify + _SigThrow, "SIGABRT: abort"},
	_SIGBUS:     {_SigPanic + _SigUnblock, "SIGBUS: bus error"},
	_SIGFPE:     {_SigPanic + _SigUnblock, "SIGFPE: floating-point exception"},
	_SIGKILL:    {0, "SIGKILL: kill"},
	_SIGUSR1:    {_SigNotify, "SIGUSR1: user-defined signal 1"},

		// Switch to curg so that we get a traceback of the Go code
		// leading up to the cgocall, which switched from curg to g0.
		gp = mp.curg
	}
	if sig == _SIGILL || sig == _SIGFPE {
		// It would be nice to know how long the instruction is.
		// Unfortunately, that's complicated to do in general (mostly for x86
		// and s930x, but other archs have non-standard instruction lengths also).