oid := [2]uint32{_CTL_QUERY, _CTL_QUERY_MIB}
	miblen := uintptr(_CTL_MAXNAME)
	if sysctl(&oid[0], 2, (*byte)(unsafe.Pointer(mib)), &miblen, (*byte)(unsafe.Pointer(&name[0])), (uintptr)(len(name))) < 0 {
		return 0
	}
	miblen /= unsafe.Sizeof(uint32(0))
	if miblen <= 0 {
		return 0
	}
	return uint32(miblen)
}

const (
	_CPU_CURRENT_PID = -1 // Current process ID.
)

//go:noescape

//go:noescape
func sigaction(sig uint32, new, old *sigactiont)

//go:noescape
func sigaltstack(new, old *stackt)

//go:noescape
func sigprocmask(how int32, new, old *sigset)

//go:noescape
func sysctl(mib *uint32, miblen uint32, out *byte, size *uintptr, dst *byte, ndst uintptr) int32

func lwp_tramp()

func raiseproc(sig uint32)

func lwp_kill(tid int32, sig int)

//go:noescape
func getcontext(ctxt unsafe.Pointer)

	ADDQ	$8, DI			// arg 1 - ptr
	MOVQ	$SYS__lwp_setprivate, AX
	SYSCALL
	JCC	2(PC)
	MOVL	$0xf1, 0xf1		// crash
	RET

TEXT runtime·sysctl(SB),NOSPLIT,$0
	MOVQ	mib+0(FP), DI		// arg 1 - name
	MOVL	miblen+8(FP), SI		// arg 2 - namelen
	MOVQ	out+16(FP), DX		// arg 3 - oldp
	MOVQ	size+24(FP), R10		// arg 4 - oldlenp
	MOVQ	dst+32(FP), R8		// arg 5 - newp
	MOVQ	ndst+40(FP), R9		// arg 6 - newlen
	MOVQ	$SYS___sysctl, AX

	MOVW $4(R13), R0 // arg 1 - rqtp
	MOVW $0, R1      // arg 2 - rmtp
	MOVW $SYS_nanosleep, R7
	SWI $0
	RET

TEXT runtime·sysctl(SB),NOSPLIT,$0
	MOVW mib+0(FP), R0	// arg 1 - name
	MOVW miblen+4(FP), R1	// arg 2 - namelen
	MOVW out+8(FP), R2	// arg 3 - old
	MOVW size+12(FP), R3	// arg 4 - oldlenp
	// arg 5 (newp) and arg 6 (newlen) are passed on stack
	ADD $20, R13
	MOVW $SYS___sysctl, R7
	SWI $0

	MOVW old+4(FP), R1	// arg 2 - oss
	SWI $SYS___sigaltstack14
	MOVW.CS $0, R8	// crash on syscall failure
	MOVW.CS R8, (R8)
	RET

TEXT runtime·sysctl(SB),NOSPLIT,$8
	MOVW mib+0(FP), R0	// arg 1 - name
	MOVW miblen+4(FP), R1	// arg 2 - namelen
	MOVW out+8(FP), R2	// arg 3 - oldp
	MOVW size+12(FP), R3	// arg 4 - oldlenp
	MOVW dst+16(FP), R4	// arg 5 - newp
	MOVW R4, 4(R13)
	MOVW ndst+20(FP), R4	// arg 6 - newlen

	RET

TEXT runtime·usleep_trampoline(SB),NOSPLIT,$32
	MOVW	0(R3), R3		// arg 1 - usec
	CALL	libc_usleep(SB)
	RET

TEXT runtime·sysctl_trampoline(SB),NOSPLIT,$32
	MOVW	8(R3), R4		// arg 2 - miblen
	MOVD	16(R3), R5		// arg 3 - out
	MOVD	24(R3), R6		// arg 4 - size
	MOVD	32(R3), R7		// arg 5 - dst
	MOVD	40(R3), R8		// arg 6 - ndst
	MOVD	0(R3), R3		// arg 1 - mib
	CALL	libc_sysctl(SB)
	RET

	RET

TEXT runtime·usleep_trampoline(SB),NOSPLIT,$8
	MOVW	0(X10), X10		// arg 1 - usec
	CALL	libc_usleep(SB)
	RET

TEXT runtime·sysctl_trampoline(SB),NOSPLIT,$8
	MOVW	8(X10), X11		// arg 2 - miblen
	MOV	16(X10), X12		// arg 3 - out
	MOV	24(X10), X13		// arg 4 - size
	MOV	32(X10), X14		// arg 5 - dst
	MOV	40(X10), X15		// arg 6 - ndst
	MOV	0(X10), X10		// arg 1 - mib
	CALL	libc_sysctl(SB)
	RET

	MOVQ	SP, SI
	MOVQ	$AMD64_SET_FSBASE, DI
	MOVQ	$SYS_sysarch, AX
	SYSCALL
	JCC	2(PC)
	MOVL	$0xf1, 0xf1  // crash
	RET

TEXT runtime·sysctl(SB),NOSPLIT,$0
	MOVQ	mib+0(FP), DI		// arg 1 - name
	MOVL	miblen+8(FP), SI		// arg 2 - namelen
	MOVQ	out+16(FP), DX		// arg 3 - oldp
	MOVQ	size+24(FP), R10		// arg 4 - oldlenp
	MOVQ	dst+32(FP), R8		// arg 5 - newp
	MOVQ	ndst+40(FP), R9		// arg 6 - newlen
	MOVQ	$SYS___sysctl, AX

	RET

TEXT runtime·usleep_trampoline(SB),NOSPLIT,$0
	MOVD	0(R0), R0		// arg 1 - usec
	CALL	libc_usleep(SB)
	RET

TEXT runtime·sysctl_trampoline(SB),NOSPLIT,$0
	MOVW	8(R0), R1		// arg 2 - miblen
	MOVD	16(R0), R2		// arg 3 - out
	MOVD	24(R0), R3		// arg 4 - size
	MOVD	32(R0), R4		// arg 5 - dst
	MOVD	40(R0), R5		// arg 6 - ndst
	MOVD	0(R0), R0		// arg 1 - mib
	CALL	libc_sysctl(SB)
	RET

	KeepAlive(new)
	KeepAlive(old)
}
func setitimer_trampoline()

//go:nosplit
//go:cgo_unsafe_args
func sysctl(mib *uint32, miblen uint32, oldp *byte, oldlenp *uintptr, newp *byte, newlen uintptr) int32 {
	ret := libcCall(unsafe.Pointer(abi.FuncPCABI0(sysctl_trampoline)), unsafe.Pointer(&mib))
	KeepAlive(mib)
	KeepAlive(oldp)
	KeepAlive(oldlenp)