// create istack out of the given (operating system) stack.
	// _cgo_init may update stackguard.
	MOVV	$runtime·g0(SB), g
	MOVV	$(-64*1024), R23
	ADDV	R23, R29, R1
	MOVV	R1, g_stackguard0(g)
	MOVV	R1, g_stackguard1(g)
	MOVV	R1, (g_stack+stack_lo)(g)
	MOVV	R29, (g_stack+stack_hi)(g)

	// if there is a _cgo_init, call it using the gcc ABI.
	MOVV	_cgo_init(SB), R25
	BEQ	R25, nocgo

	// create istack out of the given (operating system) stack.
	// _cgo_init may update stackguard.
	MOVV	$runtime·g0(SB), g
	MOVV	$(-64*1024), R30
	ADDV	R30, R3, R19
	MOVV	R19, g_stackguard0(g)
	MOVV	R19, g_stackguard1(g)
	MOVV	R19, (g_stack+stack_lo)(g)
	MOVV	R3, (g_stack+stack_hi)(g)

	// if there is a _cgo_init, call it using the gcc ABI.
	MOVV	_cgo_init(SB), R25
	BEQ	R25, nocgo

	MOVW	R5, 8(R29)	// argv

	// create istack out of the given (operating system) stack.
	// _cgo_init may update stackguard.
	MOVW	$runtime·g0(SB), g
	MOVW	$(-64*1024), R23
	ADD	R23, R29, R1
	MOVW	R1, g_stackguard0(g)
	MOVW	R1, g_stackguard1(g)
	MOVW	R1, (g_stack+stack_lo)(g)
	MOVW	R29, (g_stack+stack_hi)(g)

	// if there is a _cgo_init, call it using the gcc ABI.
	MOVW	_cgo_init(SB), R25
	BEQ	R25, nocgo
	ADDU	$-16, R29

	MOV	A1, 16(X2)	// argv

	// create istack out of the given (operating system) stack.
	// _cgo_init may update stackguard.
	MOV	$runtime·g0(SB), g
	MOV	$(-64*1024), T0
	ADD	T0, X2, T1
	MOV	T1, g_stackguard0(g)
	MOV	T1, g_stackguard1(g)
	MOV	T1, (g_stack+stack_lo)(g)
	MOV	X2, (g_stack+stack_hi)(g)

	// if there is a _cgo_init, call it using the gcc ABI.
	MOV	_cgo_init(SB), T0
	BEQ	T0, ZERO, nocgo

	// create istack out of the given (operating system) stack.
	// _cgo_init may update stackguard.
	MOVD	$runtime·g0(SB), g
	MOVD	R15, R11
	SUB	$(64*1024), R11
	MOVD	R11, g_stackguard0(g)
	MOVD	R11, g_stackguard1(g)
	MOVD	R11, (g_stack+stack_lo)(g)
	MOVD	R15, (g_stack+stack_hi)(g)

	// if there is a _cgo_init, call it using the gcc ABI.
	MOVD	_cgo_init(SB), R11
	CMPBEQ	R11, $0, nocgo

	MOVW	g, m_g0(R8)
	// save g->m = m0
	MOVW	R8, g_m(g)

	// create istack out of the OS stack
	// (1MB of system stack is available on iOS and Android)
	MOVW	$(-64*1024+104)(R13), R0
	MOVW	R0, g_stackguard0(g)
	MOVW	R0, g_stackguard1(g)
	MOVW	R0, (g_stack+stack_lo)(g)
	MOVW	R13, (g_stack+stack_hi)(g)

	BL	runtime·emptyfunc(SB)	// fault if stack check is wrong

#ifdef GOOS_openbsd

	ADD	$32, RSP
#endif

	// create istack out of the given (operating system) stack.
	// _cgo_init may update stackguard.
	MOVD	$runtime·g0(SB), g
	MOVD	RSP, R7
	MOVD	$(-64*1024)(R7), R0
	MOVD	R0, g_stackguard0(g)
	MOVD	R0, g_stackguard1(g)
	MOVD	R0, (g_stack+stack_lo)(g)
	MOVD	R7, (g_stack+stack_hi)(g)

	// if there is a _cgo_init, call it using the gcc ABI.
	MOVD	_cgo_init(SB), R12
	CBZ	R12, nocgo

#ifdef GOOS_android

	// create istack out of the given (operating system) stack.
	// _cgo_init may update stackguard.
	MOVD	$runtime·g0(SB), g
	BL	runtime·save_g(SB)
	MOVD	$(-64*1024), R31
	ADD	R31, R1, R3
	MOVD	R3, g_stackguard0(g)
	MOVD	R3, g_stackguard1(g)
	MOVD	R3, (g_stack+stack_lo)(g)
	MOVD	R1, (g_stack+stack_hi)(g)

	// If there is a _cgo_init, call it using the gcc ABI.
	MOVD	_cgo_init(SB), R12
	CMP	R12, $0
	BEQ	nocgo

	MOVL	BX, 124(SP)

	// set default stack bounds.
	// _cgo_init may update stackguard.
	MOVL	$runtime·g0(SB), BP
	LEAL	(-64*1024+104)(SP), BX
	MOVL	BX, g_stackguard0(BP)
	MOVL	BX, g_stackguard1(BP)
	MOVL	BX, (g_stack+stack_lo)(BP)
	MOVL	SP, (g_stack+stack_hi)(BP)

	// find out information about the processor we're on
	// first see if CPUID instruction is supported.
	PUSHFL
	PUSHFL

	thisg.m.morebuf.pc = 0
	thisg.m.morebuf.lr = 0
	thisg.m.morebuf.sp = 0
	thisg.m.morebuf.g = 0

	// NOTE: stackguard0 may change underfoot, if another thread
	// is about to try to preempt gp. Read it just once and use that same
	// value now and below.
	stackguard0 := atomic.Loaduintptr(&gp.stackguard0)

	// Be conservative about where we preempt.
	// We are interested in preempting user Go code, not runtime code.