MOVD	buf+0(FP), R5
	MOVD	gobuf_g(R5), R6
	MOVD	0(R6), R7	// make sure g != nil
	BR	gogo<>(SB)

TEXT gogo<>(SB), NOSPLIT|NOFRAME, $0
	MOVD	R6, g
	BL	runtime·save_g(SB)

	MOVD	0(g), R4
	MOVD	gobuf_sp(R5), R15
	MOVD	gobuf_lr(R5), LR
	MOVD	gobuf_ret(R5), R3
	MOVD	gobuf_ctxt(R5), R12
	MOVD	$0, gobuf_sp(R5)
	MOVD	$0, gobuf_ret(R5)
	MOVD	$0, gobuf_lr(R5)
	MOVD	$0, gobuf_ctxt(R5)

	MOVV	buf+0(FP), R4
	MOVV	gobuf_g(R4), R5
	MOVV	0(R5), R0	// make sure g != nil
	JMP	gogo<>(SB)

TEXT gogo<>(SB), NOSPLIT|NOFRAME, $0
	MOVV	R5, g
	JAL	runtime·save_g(SB)

	MOVV	gobuf_sp(R4), R3
	MOVV	gobuf_lr(R4), R1
	MOVV	gobuf_ret(R4), R19
	MOVV	gobuf_ctxt(R4), REGCTXT
	MOVV	R0, gobuf_sp(R4)
	MOVV	R0, gobuf_ret(R4)
	MOVV	R0, gobuf_lr(R4)
	MOVV	R0, gobuf_ctxt(R4)

	MOVW	buf+0(FP), R3
	MOVW	gobuf_g(R3), R4
	MOVW	0(R4), R5	// make sure g != nil
	JMP	gogo<>(SB)

TEXT gogo<>(SB),NOSPLIT|NOFRAME,$0
	MOVW	R4, g
	JAL	runtime·save_g(SB)
	MOVW	gobuf_sp(R3), R29
	MOVW	gobuf_lr(R3), R31
	MOVW	gobuf_ret(R3), R1
	MOVW	gobuf_ctxt(R3), REGCTXT
	MOVW	R0, gobuf_sp(R3)
	MOVW	R0, gobuf_ret(R3)
	MOVW	R0, gobuf_lr(R3)
	MOVW	R0, gobuf_ctxt(R3)
	MOVW	gobuf_pc(R3), R4

	B	runtime·abort(SB)

	// Called from f.
	// Set m->morebuf to f's caller.
	MOVW	R3, (m_morebuf+gobuf_pc)(R8)	// f's caller's PC
	MOVW	R13, (m_morebuf+gobuf_sp)(R8)	// f's caller's SP
	MOVW	g, (m_morebuf+gobuf_g)(R8)

	// Call newstack on m->g0's stack.
	MOVW	m_g0(R8), R0
	BL	setg<>(SB)
	MOVW	(g_sched+gobuf_sp)(g), R13
	MOVW	$0, R0
	MOVW.W  R0, -4(R13)	// create a call frame on g0 (saved LR)
	BL	runtime·newstack(SB)

	MOVL	4(SP), DI	// f's caller's PC
	MOVL	DI, (m_morebuf+gobuf_pc)(BX)
	LEAL	8(SP), CX	// f's caller's SP
	MOVL	CX, (m_morebuf+gobuf_sp)(BX)
	get_tls(CX)
	MOVL	g(CX), SI
	MOVL	SI, (m_morebuf+gobuf_g)(BX)

	// Call newstack on m->g0's stack.
	MOVL	m_g0(BX), BP
	MOVL	BP, g(CX)
	MOVL	(g_sched+gobuf_sp)(BP), AX
	MOVL	-4(AX), BX	// fault if CALL would, before smashing SP
	MOVL	AX, SP

	MOVD	buf+0(FP), R5
	MOVD	gobuf_g(R5), R6
	MOVD	0(R6), R4	// make sure g != nil
	B	gogo<>(SB)

TEXT gogo<>(SB), NOSPLIT|NOFRAME, $0
	MOVD	R6, g
	BL	runtime·save_g(SB)

	MOVD	gobuf_sp(R5), R0
	MOVD	R0, RSP
	MOVD	gobuf_bp(R5), R29
	MOVD	gobuf_lr(R5), LR
	MOVD	gobuf_ret(R5), R0
	MOVD	gobuf_ctxt(R5), R26
	MOVD	$0, gobuf_sp(R5)
	MOVD	$0, gobuf_bp(R5)
	MOVD	$0, gobuf_ret(R5)

	BL	runtime·abort(SB)

	// Called from f.
	// Set m->morebuf to f's caller.
	MOVD	R5, (m_morebuf+gobuf_pc)(R7)	// f's caller's PC
	MOVD	R1, (m_morebuf+gobuf_sp)(R7)	// f's caller's SP
	MOVD	g, (m_morebuf+gobuf_g)(R7)

	// Call newstack on m->g0's stack.
	MOVD	m_g0(R7), g
	BL	runtime·save_g(SB)
	MOVD	(g_sched+gobuf_sp)(g), R1
	MOVDU   R0, -(FIXED_FRAME+0)(R1)	// create a call frame on g0
	BL	runtime·newstack(SB)

	MOVQ	8(SP), AX	// f's caller's PC
	MOVQ	AX, (m_morebuf+gobuf_pc)(BX)
	LEAQ	16(SP), AX	// f's caller's SP
	MOVQ	AX, (m_morebuf+gobuf_sp)(BX)
	MOVQ	DI, (m_morebuf+gobuf_g)(BX)

	// Call newstack on m->g0's stack.
	MOVQ	m_g0(BX), BX
	MOVQ	BX, g(CX)
	MOVQ	(g_sched+gobuf_sp)(BX), SP
	MOVQ	(g_sched+gobuf_bp)(BX), BP
	CALL	runtime·newstack(SB)
	CALL	runtime·abort(SB)	// crash if newstack returns

TEXT	msancall<>(SB), NOSPLIT, $0-0
	MOVV	R3, R23         // callee-saved
	BEQ	g, g0stack      // no g, still on a system stack
	MOVV	g_m(g), R14
	MOVV	m_g0(R14), R15
	BEQ	R15, g, g0stack

	MOVV	(g_sched+gobuf_sp)(R15), R9
	MOVV	R9, R3

g0stack:
	JAL	(FARG)
	MOVV	R23, R3

	MOVD	RSP, R19                  // callee-saved
	CBZ	g, g0stack                // no g, still on a system stack
	MOVD	g_m(g), R10
	MOVD	m_g0(R10), R11
	CMP	R11, g
	BEQ	g0stack

	MOVD	(g_sched+gobuf_sp)(R11), R4
	MOVD	R4, RSP

g0stack:
	BL	(FARG)
	MOVD	R19, RSP