_UMTX_OP_WAKE              = 0x3
	_UMTX_OP_WAKE_PRIVATE      = 0x10

	_SIGHUP    = 0x1
	_SIGINT    = 0x2
	_SIGQUIT   = 0x3
	_SIGILL    = 0x4
	_SIGTRAP   = 0x5
	_SIGABRT   = 0x6
	_SIGEMT    = 0x7
	_SIGFPE    = 0x8
	_SIGKILL   = 0x9
	_SIGBUS    = 0xa
	_SIGSEGV   = 0xb
	_SIGSYS    = 0xc
	_SIGPIPE   = 0xd
	_SIGALRM   = 0xe
	_SIGTERM   = 0xf
	_SIGURG    = 0x10
	_SIGSTOP   = 0x11
	_SIGTSTP   = 0x12

	_MADV_DONTNEED = C.MADV_DONTNEED

	_SIGHUP     = C.SIGHUP
	_SIGINT     = C.SIGINT
	_SIGQUIT    = C.SIGQUIT
	_SIGILL     = C.SIGILL
	_SIGTRAP    = C.SIGTRAP
	_SIGABRT    = C.SIGABRT
	_SIGBUS     = C.SIGBUS
	_SIGFPE     = C.SIGFPE
	_SIGKILL    = C.SIGKILL
	_SIGUSR1    = C.SIGUSR1
	_SIGSEGV    = C.SIGSEGV
	_SIGUSR2    = C.SIGUSR2
	_SIGPIPE    = C.SIGPIPE
	_SIGALRM    = C.SIGALRM
	_SIGCHLD    = C.SIGCHLD

	_SA_SIGINFO  = 0x4

	_SI_KERNEL = 0x80
	_SI_TIMER  = -0x2

	_SIGHUP    = 0x1
	_SIGINT    = 0x2
	_SIGQUIT   = 0x3
	_SIGILL    = 0x4
	_SIGTRAP   = 0x5
	_SIGABRT   = 0x6
	_SIGBUS    = 0x7
	_SIGFPE    = 0x8
	_SIGKILL   = 0x9
	_SIGUSR1   = 0xa
	_SIGSEGV   = 0xb
	_SIGUSR2   = 0xc
	_SIGPIPE   = 0xd
	_SIGALRM   = 0xe
	_SIGSTKFLT = 0x10
	_SIGCHLD   = 0x11
	_SIGCONT   = 0x12
	_SIGSTOP   = 0x13

	_SA_ONSTACK   = 0x1
	_SA_USERTRAMP = 0x100
	_SA_64REGSET  = 0x200

	_SIGHUP    = 0x1
	_SIGINT    = 0x2
	_SIGQUIT   = 0x3
	_SIGILL    = 0x4
	_SIGTRAP   = 0x5
	_SIGABRT   = 0x6
	_SIGEMT    = 0x7
	_SIGFPE    = 0x8
	_SIGKILL   = 0x9
	_SIGBUS    = 0xa
	_SIGSEGV   = 0xb
	_SIGSYS    = 0xc
	_SIGPIPE   = 0xd
	_SIGALRM   = 0xe
	_SIGTERM   = 0xf
	_SIGURG    = 0x10
	_SIGSTOP   = 0x11
	_SIGTSTP   = 0x12

	_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).