if mp.profileTimerValid.Load() {
		timerid := mp.profileTimer
		mp.profileTimerValid.Store(false)
		mp.profileTimer = 0

		ret := timer_delete(timerid)
		if ret != 0 {
			print("runtime: failed to disable profiling timer; timer_delete(", timerid, ") errno=", -ret, "\n")
			throw("timer_delete")
		}
	}

	if hz == 0 {
		// If the goal was to disable profiling for this thread, then the job's done.
		return
	}

	MOVW	timerid+0(FP), A0
	MOVW	flags+4(FP), A1
	MOV	new+8(FP), A2
	MOV	old+16(FP), A3
	MOV	$SYS_timer_settime, A7
	ECALL
	MOVW	A0, ret+24(FP)
	RET

// func timer_delete(timerid int32) int32
TEXT runtime·timer_delete(SB),NOSPLIT,$0-12
	MOVW	timerid+0(FP), A0
	MOV	$SYS_timer_delete, A7
	ECALL
	MOVW	A0, ret+8(FP)
	RET

	MOVW	timerid+0(FP), R4
	MOVW	flags+4(FP), R5
	MOVV	new+8(FP), R6
	MOVV	old+16(FP), R7
	MOVV	$SYS_timer_settime, R11
	SYSCALL
	MOVW	R4, ret+24(FP)
	RET

// func timer_delete(timerid int32) int32
TEXT runtime·timer_delete(SB),NOSPLIT,$0-12
	MOVW	timerid+0(FP), R4
	MOVV	$SYS_timer_delete, R11
	SYSCALL
	MOVW	R4, ret+8(FP)
	RET

	SYS_TIMER_CREATE         = 235 // { int|sys||timer_create(clockid_t clock_id, struct sigevent *evp, timer_t *timerid); }
	SYS_TIMER_DELETE         = 236 // { int|sys||timer_delete(timer_t timerid); }
	SYS_TIMER_GETOVERRUN     = 239 // { int|sys||timer_getoverrun(timer_t timerid); }
	SYS_FDATASYNC            = 241 // { int|sys||fdatasync(int fd); }

	SYS_TIMER_CREATE         = 235 // { int|sys||timer_create(clockid_t clock_id, struct sigevent *evp, timer_t *timerid); }
	SYS_TIMER_DELETE         = 236 // { int|sys||timer_delete(timer_t timerid); }
	SYS_TIMER_GETOVERRUN     = 239 // { int|sys||timer_getoverrun(timer_t timerid); }
	SYS_FDATASYNC            = 241 // { int|sys||fdatasync(int fd); }

	SYS_TIMER_CREATE         = 235 // { int|sys||timer_create(clockid_t clock_id, struct sigevent *evp, timer_t *timerid); }
	SYS_TIMER_DELETE         = 236 // { int|sys||timer_delete(timer_t timerid); }
	SYS_TIMER_GETOVERRUN     = 239 // { int|sys||timer_getoverrun(timer_t timerid); }
	SYS_FDATASYNC            = 241 // { int|sys||fdatasync(int fd); }

	SYS_TIMER_CREATE         = 235 // { int|sys||timer_create(clockid_t clock_id, struct sigevent *evp, timer_t *timerid); }
	SYS_TIMER_DELETE         = 236 // { int|sys||timer_delete(timer_t timerid); }
	SYS_TIMER_GETOVERRUN     = 239 // { int|sys||timer_getoverrun(timer_t timerid); }
	SYS_FDATASYNC            = 241 // { int|sys||fdatasync(int fd); }

	SYS_TIMER_CREATE         = 235 // { int|sys||timer_create(clockid_t clock_id, struct sigevent *evp, timer_t *timerid); }
	SYS_TIMER_DELETE         = 236 // { int|sys||timer_delete(timer_t timerid); }
	SYS_TIMER_GETOVERRUN     = 239 // { int|sys||timer_getoverrun(timer_t timerid); }
	SYS_FDATASYNC            = 241 // { int|sys||fdatasync(int fd); }

	SYS_TIMER_CREATE         = 235 // { int|sys||timer_create(clockid_t clock_id, struct sigevent *evp, timer_t *timerid); }
	SYS_TIMER_DELETE         = 236 // { int|sys||timer_delete(timer_t timerid); }
	SYS_TIMER_GETOVERRUN     = 239 // { int|sys||timer_getoverrun(timer_t timerid); }
	SYS_FDATASYNC            = 241 // { int|sys||fdatasync(int fd); }

	SYS_TIMER_CREATE         = 235 // { int|sys||timer_create(clockid_t clock_id, struct sigevent *evp, timer_t *timerid); }
	SYS_TIMER_DELETE         = 236 // { int|sys||timer_delete(timer_t timerid); }
	SYS_TIMER_GETOVERRUN     = 239 // { int|sys||timer_getoverrun(timer_t timerid); }
	SYS_FDATASYNC            = 241 // { int|sys||fdatasync(int fd); }