MOVW	(R6), R6
	CMP	$0, R6
	B.NE	done

dropm:
	MOVW	$runtime·dropm(SB), R0
	BL	(R0)

done:
	// Done!
	RET

// void setg(G*); set g. for use by needm.
TEXT runtime·setg(SB),NOSPLIT|NOFRAME,$0-4
	MOVW	gg+0(FP), R0
	B	setg<>(SB)

TEXT setg<>(SB),NOSPLIT|NOFRAME,$0-0
	MOVW	R0, g

	// Save g to thread-local storage.
#ifdef GOOS_windows
	B	runtime·save_g(SB)
#else

		// it may hit stack split that is not expected here.
		if gp != nil {
			setg(nil)
		}
		badsignal(uintptr(sig), c)
		// Restore g
		if gp != nil {
			setg(gp)
		}
		return
	}

	setg(gp.m.gsignal)

	// If some non-Go code called sigaltstack, adjust.
	var gsignalStack gsignalStack

((SETNE|SETL|SETG|SETB|SETA)     (FlagEQ))     => (MOVLconst [0])
((SETNE|SETL|SETLE|SETB|SETBE)   (FlagLT_ULT)) => (MOVLconst [1])
((SETEQ|SETG|SETGE|SETA|SETAE)   (FlagLT_ULT)) => (MOVLconst [0])
((SETNE|SETL|SETLE|SETA|SETAE)   (FlagLT_UGT)) => (MOVLconst [1])
((SETEQ|SETG|SETGE|SETB|SETBE)   (FlagLT_UGT)) => (MOVLconst [0])
((SETNE|SETG|SETGE|SETB|SETBE)   (FlagGT_ULT)) => (MOVLconst [1])

	CMPBEQ	R11, $0, nocgo
	MOVW	AR0, R4			// (AR0 << 32 | AR1) is the TLS base pointer; MOVD is translated to EAR
	SLD	$32, R4, R4
	MOVW	AR1, R4			// arg 2: TLS base pointer
	MOVD	$setg_gcc<>(SB), R3 	// arg 1: setg
	MOVD	g, R2			// arg 0: G
	// C functions expect 160 bytes of space on caller stack frame
	// and an 8-byte aligned stack pointer
	MOVD	R15, R9			// save current stack (R9 is preserved in the Linux ABI)

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

	MOVV	R0, R7	// arg 3: not used
	MOVV	R0, R6	// arg 2: not used
	MOVV	$setg_gcc<>(SB), R5	// arg 1: setg
	MOVV	g, R4	// arg 0: G
	JAL	(R25)

nocgo:
	// update stackguard after _cgo_init
	MOVV	(g_stack+stack_lo)(g), R19
	ADDV	$const_stackGuard, R19
	MOVV	R19, g_stackguard0(g)
	MOVV	R19, g_stackguard1(g)

	// if there is a _cgo_init, call it using the gcc ABI.
	MOVW	_cgo_init(SB), R25
	BEQ	R25, nocgo
	ADDU	$-16, R29
	MOVW	R0, R7	// arg 3: not used
	MOVW	R0, R6	// arg 2: not used
	MOVW	$setg_gcc<>(SB), R5	// arg 1: setg
	MOVW	g, R4	// arg 0: G
	JAL	(R25)
	ADDU	$16, R29

nocgo:
	// update stackguard after _cgo_init
	MOVW	(g_stack+stack_lo)(g), R1
	ADD	$const_stackGuard, R1
	MOVW	R1, g_stackguard0(g)

//
// When fn is nil (frame is saved g), call dropm instead,
// this is used when the C thread is exiting.
func cgocallback(fn, frame, ctxt uintptr)

func gogo(buf *gobuf)

func asminit()
func setg(gg *g)
func breakpoint()

// reflectcall calls fn with arguments described by stackArgs, stackArgsSize,
// frameSize, and regArgs.
//
// Arguments passed on the stack and space for return values passed on the stack

	MOVD	8(R12), R2
	MOVD	(R12), R12
#endif
	MOVD	R12, CTR		// r12 = "global function entry point"
	MOVD	R13, R5			// arg 2: TLS base pointer
	MOVD	$setg_gcc<>(SB), R4 	// arg 1: setg
	MOVD	g, R3			// arg 0: G
	// C functions expect 32 (48 for AIX) bytes of space on caller
	// stack frame and a 16-byte aligned R1
	MOVD	R1, R14			// save current stack
	SUB	$cgoCalleeStackSize, R1	// reserve the callee area

	MOVD	R0, R3			// arg 3: TLS base pointer
	MOVD	$runtime·tls_g(SB), R2 	// arg 2: &tls_g
#else
	MOVD	$0, R2		        // arg 2: not used when using platform's TLS
#endif
	MOVD	$setg_gcc<>(SB), R1	// arg 1: setg
	MOVD	g, R0			// arg 0: G
	SUB	$16, RSP		// reserve 16 bytes for sp-8 where fp may be saved.
	BL	(R12)
	ADD	$16, RSP

nocgo:
	BL	runtime·save_g(SB)
	// update stackguard after _cgo_init

	// Store the original signal mask for use by minit.
	mp.sigmask = sigmask

	// Install TLS on some platforms (previously setg
	// would do this if necessary).
	osSetupTLS(mp)

	// Install g (= m->g0) and set the stack bounds
	// to match the current stack.
	setg(mp.g0)
	sp := getcallersp()
	callbackUpdateSystemStack(mp, sp, signal)

	// Should mark we are already in Go now.