// It may still have an M, if it's locked to some M.
		mp = gp.lockedm.ptr()
	}
	nstk := 1
	if tracefpunwindoff() || (mp != nil && mp.hasCgoOnStack()) {
		// Slow path: Unwind using default unwinder. Used when frame pointer
		// unwinding is unavailable or disabled (tracefpunwindoff), or might
		// produce incomplete results or crashes (hasCgoOnStack). Note that no

	MOVD	24(R1), R2

	UNSTACK_AND_RESTORE_GO_TO_HOST_ABI(32)
	RET

#ifdef GOARCH_ppc64le
TEXT runtime·cgoSigtramp(SB),NOSPLIT|NOFRAME,$0
	// The stack unwinder, presumably written in C, may not be able to
	// handle Go frame correctly. So, this function is NOFRAME, and we
	// save/restore LR manually, and obey ELFv2 calling conventions.
	MOVD	LR, R10

	Setting N to 0 will report no ancestry information.

	tracefpunwindoff: setting tracefpunwindoff=1 forces the execution tracer to
	use the runtime's default stack unwinder instead of frame pointer unwinding.
	This increases tracer overhead, but could be helpful as a workaround or for
	debugging unexpected regressions caused by frame pointer unwinding.

	// Force SPWRITE. This function doesn't actually write SP,
	// but it is called with a special calling convention where
	// the caller doesn't save LR on stack but passes it as a
	// register (R5), and the unwinder currently doesn't understand.
	// Make it SPWRITE to stop unwinding. (See issue 54332)
	MOVV    R3, R3

	MOVV	R0, REGCTXT
	JMP	runtime·morestack(SB)

	gp.stack = new
	gp.stackguard0 = new.lo + stackGuard // NOTE: might clobber a preempt request
	gp.sched.sp = new.hi - used
	gp.stktopsp += adjinfo.delta

	// Adjust pointers in the new stack.
	var u unwinder
	for u.init(gp, 0); u.valid(); u.next() {
		adjustframe(&u.frame, &adjinfo)
	}

	// free old stack
	if stackPoisonCopy != 0 {
		fillstack(old, 0xfc)
	}
	stackfree(old)
}

			// stack trace, and there only the real PCs are printed, not the virtual ones.
			// So check to see if the implied virtual PC for this PC (obtained from the
			// unwinder itself) is the next PC in ci.callers. If not, insert it.
			// The +1 here correspond to the pc-- above: the output of Callers
			// and therefore the input to CallersFrames is return PCs from the stack;

	if p.lr == 0 {
		return false
	}

	gp := getg()
	systemstack(func() {
		var limit uintptr
		if d := gp._defer; d != nil {
			limit = d.sp
		}

		var u unwinder
		u.initAt(p.lr, uintptr(p.fp), 0, gp, 0)
		for {
			if !u.valid() {
				p.lr = 0
				return // ok == false
			}

			// TODO(mdempsky): If we populate u.frame.fn.deferreturn for

	// Force SPWRITE. This function doesn't actually write SP,
	// but it is called with a special calling convention where
	// the caller doesn't save LR on stack but passes it as a
	// register (R5), and the unwinder currently doesn't understand.
	// Make it SPWRITE to stop unwinding. (See issue 54332)
	// Use OR R0, R1 instead of MOVD R1, R1 as the MOVD instruction
	// has a special affect on Power8,9,10 by lowering the thread 

	// Force SPWRITE. This function doesn't actually write SP,
	// but it is called with a special calling convention where
	// the caller doesn't save LR on stack but passes it as a
	// register (R3), and the unwinder currently doesn't understand.
	// Make it SPWRITE to stop unwinding. (See issue 54332)
	MOVD	RSP, RSP

	MOVW	$0, R26
	B runtime·morestack(SB)

		}
	}
	return gp.m.lockedExt, gp.m.lockedInt
}

//go:noinline
func TracebackSystemstack(stk []uintptr, i int) int {
	if i == 0 {
		pc, sp := getcallerpc(), getcallersp()
		var u unwinder
		u.initAt(pc, sp, 0, getg(), unwindJumpStack) // Don't ignore errors, for testing
		return tracebackPCs(&u, 0, stk)
	}
	n := 0
	systemstack(func() {
		n = TracebackSystemstack(stk, i-1)
	})
	return n