// the stack is safe to reclaim.
//
//go:noescape
func exitThread(wait *atomic.Uint32)

//go:noescape
func obsdsigprocmask(how int32, new sigset) sigset

//go:nosplit
//go:nowritebarrierrec
func sigprocmask(how int32, new, old *sigset) {
	n := sigset(0)
	if new != nil {
		n = *new
	}
	r := obsdsigprocmask(how, n)
	if old != nil {
		*old = r
	}
}

func pipe2(flags int32) (r, w int32, errno int32)

	KeepAlive(new)
	KeepAlive(old)
}
func sigaction_trampoline()

//go:nosplit
//go:cgo_unsafe_args
func sigprocmask(how uint32, new *sigset, old *sigset) {
	// sigprocmask is called from sigsave, which is called from needm.
	// As such, we have to be able to run with no g here.
	asmcgocall_no_g(unsafe.Pointer(abi.FuncPCABI0(sigprocmask_trampoline)), unsafe.Pointer(&how))

	ECALL
	BNE	T0, ZERO, fail
	RET
fail:
	WORD	$0	// crash

// func osyield()
TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
	MOV	$SYS_sched_yield, T0
	ECALL
	RET

// func sigprocmask(how int32, new, old *sigset)
TEXT runtime·sigprocmask(SB),NOSPLIT|NOFRAME,$0-24
	MOVW	how+0(FP), A0
	MOV	new+8(FP), A1
	MOV	old+16(FP), A2
	MOV	$SYS_sigprocmask, T0
	ECALL
	BNE	T0, ZERO, fail
	RET

	SVC
	BCS	fail
	RET
fail:
	MOVD	$0, R0
	MOVD	R0, (R0)	// crash

// func osyield()
TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
	MOVD	$SYS_sched_yield, R8
	SVC
	RET

// func sigprocmask(how int32, new, old *sigset)
TEXT runtime·sigprocmask(SB),NOSPLIT|NOFRAME,$0-24
	MOVW	how+0(FP), R0
	MOVD	new+8(FP), R1
	MOVD	old+16(FP), R2
	MOVD	$SYS_sigprocmask, R8
	SVC
	BCS	fail
	RET
fail: