BEQ	sigtramp    // g.m == nil
	MOVW	m_ncgo(R6), R7
	CMPW	$0, R7
	BEQ	sigtramp    // g.m.ncgo = 0
	MOVD	m_curg(R6), R7
	CMP	$0, R7
	BEQ	sigtramp    // g.m.curg == nil
	MOVD	g_syscallsp(R7), R7
	CMP	$0, R7
	BEQ	sigtramp    // g.m.curg.syscallsp == 0
	MOVD	m_cgoCallers(R6), R7 // R7 is the fifth arg in C calling convention.
	CMP	$0, R7
	BEQ	sigtramp    // g.m.cgoCallers == nil
	MOVW	m_cgoCallersUse(R6), R8
	CMPW	$0, R8

	MOVL	m_ncgo(AX), CX
	TESTL	CX, CX
	JZ	sigtramp        // g.m.ncgo == 0
	MOVQ	m_curg(AX), CX
	TESTQ	CX, CX
	JZ	sigtramp        // g.m.curg == nil
	MOVQ	g_syscallsp(CX), CX
	TESTQ	CX, CX
	JZ	sigtramp        // g.m.curg.syscallsp == 0
	MOVQ	m_cgoCallers(AX), R8
	TESTQ	R8, R8
	JZ	sigtramp        // g.m.cgoCallers == nil
	MOVL	m_cgoCallersUse(AX), CX
	TESTL	CX, CX
	JNZ	sigtramp	// g.m.cgoCallersUse != 0

			// here.
			//
			// (3) We're called against a gp that we're not currently executing on, but that is in
			// a syscall, in which case gp.syscallsp != 0. gp.syscall* contains the most up-to-date
			// information about where it stopped, and like case (1), we match gcallers here.
			if gp.syscallsp != 0 {
				pcBuf[1] = gp.syscallpc
				nstk += 1 + fpTracebackPCs(unsafe.Pointer(gp.syscallbp), pcBuf[2:])
			} else {

	if stkmap != nil {
		child.args = stackmapdata(stkmap, pcdata)
	} else {
		child.args.n = -1
	}
	return
}

func dumpgoroutine(gp *g) {
	var sp, pc, lr uintptr
	if gp.syscallsp != 0 {
		sp = gp.syscallsp
		pc = gp.syscallpc
		lr = 0
	} else {
		sp = gp.sched.sp
		pc = gp.sched.pc
		lr = gp.sched.lr
	}

	dumpint(tagGoroutine)
	dumpint(uint64(uintptr(unsafe.Pointer(gp))))

		// instead on the g0 stack.
		throw("cannot trace user goroutine on its own stack")
	}

	if pc0 == ^uintptr(0) && sp0 == ^uintptr(0) { // Signal to fetch saved values from gp.
		if gp.syscallsp != 0 {
			pc0 = gp.syscallpc
			sp0 = gp.syscallsp
			if usesLR {
				lr0 = 0
			}
		} else {
			pc0 = gp.sched.pc
			sp0 = gp.sched.sp
			if usesLR {
				lr0 = gp.sched.lr
			}
		}
	}

	pc := getcallerpc()
	sp := getcallersp()
	bp := getcallerfp()
	save(pc, sp, bp)
	gp.syscallsp = gp.sched.sp
	gp.syscallpc = gp.sched.pc
	gp.syscallbp = gp.sched.bp
	if gp.syscallsp < gp.stack.lo || gp.stack.hi < gp.syscallsp {
		sp1 := sp
		sp2 := gp.sched.sp
		sp3 := gp.syscallsp
		systemstack(func() {

		throw("runtime: wrong goroutine in newstack")
	}

	gp := thisg.m.curg

	if thisg.m.curg.throwsplit {
		// Update syscallsp, syscallpc in case traceback uses them.
		morebuf := thisg.m.morebuf
		gp.syscallsp = morebuf.sp
		gp.syscallpc = morebuf.pc
		pcname, pcoff := "(unknown)", uintptr(0)
		f := findfunc(gp.sched.pc)
		if f.valid() {
			pcname = funcname(f)

	_panic    *_panic // innermost panic - offset known to liblink
	_defer    *_defer // innermost defer
	m         *m      // current m; offset known to arm liblink
	sched     gobuf
	syscallsp uintptr // if status==Gsyscall, syscallsp = sched.sp to use during gc
	syscallpc uintptr // if status==Gsyscall, syscallpc = sched.pc to use during gc
	syscallbp uintptr // if status==Gsyscall, syscallbp = sched.bp to use in fpTraceback

		throw("can't scan our own stack")
	}

	// scannedSize is the amount of work we'll be reporting.
	//
	// It is less than the allocated size (which is hi-lo).
	var sp uintptr
	if gp.syscallsp != 0 {
		sp = gp.syscallsp // If in a system call this is the stack pointer (gp.sched.sp can be 0 in this case on Windows).
	} else {
		sp = gp.sched.sp
	}
	scannedSize := gp.stack.hi - sp

	// stack. However, since we're returning to an earlier stack frame and
	// need to pair with the entersyscall() call made by cgocall, we must
	// save syscall* and let reentersyscall restore them.
	savedsp := unsafe.Pointer(gp.syscallsp)
	savedpc := gp.syscallpc
	savedbp := gp.syscallbp
	exitsyscall() // coming out of cgo call
	gp.m.incgo = false
	if gp.m.isextra {
		gp.m.isExtraInC = false
	}

	osPreemptExtExit(gp.m)