//
// It must be nosplit because it is used by the signal handler before
// it definitely has a Go stack.
//
//go:nosplit
func raise(sig uint32) {
	thr_kill(thr_self(), int(sig))
}

func signalM(mp *m, sig int) {
	thr_kill(thread(mp.procid), sig)
}

// sigPerThreadSyscall is only used on linux, so we assign a bogus signal
// number.
const sigPerThreadSyscall = 1 << 31

//go:nosplit

	RET

// func thr_self() thread
TEXT runtime·thr_self(SB),NOSPLIT,$8-8
	MOVD	$ptr-8(SP), R0	// arg 1 &8(SP)
	MOVD	$SYS_thr_self, R8
	SVC
	MOVD	ptr-8(SP), R0
	MOVD	R0, ret+0(FP)
	RET

// func thr_kill(t thread, sig int)
TEXT runtime·thr_kill(SB),NOSPLIT,$0-16
	MOVD	tid+0(FP), R0	// arg 1 pid
	MOVD	sig+8(FP), R1	// arg 2 sig
	MOVD	$SYS_thr_kill, R8
	SVC
	RET

// func raiseproc(sig uint32)

	RET

TEXT runtime·thr_self(SB),NOSPLIT,$8-4
	// thr_self(&0(FP))
	LEAL	ret+0(FP), AX
	MOVL	AX, 4(SP)
	MOVL	$SYS_thr_self, AX
	INT	$0x80
	RET

TEXT runtime·thr_kill(SB),NOSPLIT,$-4
	// thr_kill(tid, sig)
	MOVL	$SYS_thr_kill, AX
	INT	$0x80
	RET

TEXT runtime·raiseproc(SB),NOSPLIT,$16
	// getpid
	MOVL	$SYS_getpid, AX
	INT	$0x80
	// kill(self, sig)
	MOVL	AX, 4(SP)
	MOVL	sig+0(FP), AX

	RET

// func thr_self() thread
TEXT runtime·thr_self(SB),NOSPLIT,$8-8
	MOV	$ptr-8(SP), A0	// arg 1 &8(SP)
	MOV	$SYS_thr_self, T0
	ECALL
	MOV	ptr-8(SP), A0
	MOV	A0, ret+0(FP)
	RET

// func thr_kill(t thread, sig int)
TEXT runtime·thr_kill(SB),NOSPLIT,$0-16
	MOV	tid+0(FP), A0	// arg 1 pid
	MOV	sig+8(FP), A1	// arg 2 sig
	MOV	$SYS_thr_kill, T0
	ECALL
	RET

// func raiseproc(sig uint32)

	RET

TEXT runtime·thr_self(SB),NOSPLIT,$0-4
	// thr_self(&0(FP))
	MOVW $ret+0(FP), R0 // arg 1
	MOVW $SYS_thr_self, R7
	SWI $0
	RET

TEXT runtime·thr_kill(SB),NOSPLIT,$0-8
	// thr_kill(tid, sig)
	MOVW tid+0(FP), R0	// arg 1 id
	MOVW sig+4(FP), R1	// arg 2 signal
	MOVW $SYS_thr_kill, R7
	SWI $0
	RET

TEXT runtime·raiseproc(SB),NOSPLIT,$0
	// getpid
	MOVW $SYS_getpid, R7
	SWI $0

	SYS_THR_EXIT                 = 431 // { void thr_exit(long *state); }
	SYS_THR_SELF                 = 432 // { int thr_self(long *id); }
	SYS_THR_KILL                 = 433 // { int thr_kill(long id, int sig); }
	SYS__UMTX_LOCK               = 434 // { int _umtx_lock(struct umtx *umtx); }
	SYS__UMTX_UNLOCK             = 435 // { int _umtx_unlock(struct umtx *umtx); }

	SYS_THR_EXIT                 = 431 // { void thr_exit(long *state); }
	SYS_THR_SELF                 = 432 // { int thr_self(long *id); }
	SYS_THR_KILL                 = 433 // { int thr_kill(long id, int sig); }
	SYS__UMTX_LOCK               = 434 // { int _umtx_lock(struct umtx *umtx); }
	SYS__UMTX_UNLOCK             = 435 // { int _umtx_unlock(struct umtx *umtx); }

	SYS_THR_EXIT                 = 431 // { void thr_exit(long *state); }
	SYS_THR_SELF                 = 432 // { int thr_self(long *id); }
	SYS_THR_KILL                 = 433 // { int thr_kill(long id, int sig); }
	SYS__UMTX_LOCK               = 434 // { int _umtx_lock(struct umtx *umtx); }
	SYS__UMTX_UNLOCK             = 435 // { int _umtx_unlock(struct umtx *umtx); }

	RET

TEXT runtime·thr_self(SB),NOSPLIT,$0-8
	// thr_self(&0(FP))
	LEAQ	ret+0(FP), DI	// arg 1
	MOVL	$SYS_thr_self, AX
	SYSCALL
	RET

TEXT runtime·thr_kill(SB),NOSPLIT,$0-16
	// thr_kill(tid, sig)
	MOVQ	tid+0(FP), DI	// arg 1 id
	MOVQ	sig+8(FP), SI	// arg 2 sig
	MOVL	$SYS_thr_kill, AX
	SYSCALL
	RET

TEXT runtime·raiseproc(SB),NOSPLIT,$0
	// getpid
	MOVL	$SYS_getpid, AX
	SYSCALL

	SYS_THR_EXIT                 = 431 // { void thr_exit(long *state); }
	SYS_THR_SELF                 = 432 // { int thr_self(long *id); }
	SYS_THR_KILL                 = 433 // { int thr_kill(long id, int sig); }
	SYS_JAIL_ATTACH              = 436 // { int jail_attach(int jid); }
	SYS_EXTATTR_LIST_FD          = 437 // { ssize_t extattr_list_fd(int fd, int attrnamespace, void *data, size_t nbytes); }