needextram    bool
	traceback     uint8
	ncgocall      uint64        // number of cgo calls in total
	ncgo          int32         // number of cgo calls currently in progress
	cgoCallersUse atomic.Uint32 // if non-zero, cgoCallers in use temporarily
	cgoCallers    *cgoCallers   // cgo traceback if crashing in cgo call
	park          note
	alllink       *m // on allm

	// To save m->curg->sched.pc, we push it onto the stack.
	// This has the added benefit that it looks to the traceback
	// routine like cgocallbackg is going to return to that
	// PC (because the frame we allocate below has the same
	// size as cgocallback_gofunc's frame declared above)
	// so that the traceback will seamlessly trace back into
	// the earlier calls.
	MOVV	m_curg(R12), g
	JAL	runtime·save_g(SB)

// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB),NOSPLIT,$16-12
	MOVV	R29, R16	// R16 is unchanged by C code
	MOVV	R29, R1

	MOVV	g_m(g), R17	// R17 = m

	// Set vdsoPC and vdsoSP for SIGPROF traceback.
	// Save the old values on stack and restore them on exit,
	// so this function is reentrant.
	MOVV	m_vdsoPC(R17), R2
	MOVV	m_vdsoSP(R17), R3
	MOVV	R2, 8(R29)
	MOVV	R3, 16(R29)

// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB),NOSPLIT,$24-12
	MOVV	R3, R23	// R23 is unchanged by C code
	MOVV	R3, R25

	MOVV	g_m(g), R24	// R24 = m

	// Set vdsoPC and vdsoSP for SIGPROF traceback.
	// Save the old values on stack and restore them on exit,
	// so this function is reentrant.
	MOVV	m_vdsoPC(R24), R11
	MOVV	m_vdsoSP(R24), R7
	MOVV	R11, 8(R3)
	MOVV	R7, 16(R3)

	UNDEF

/*
 * support for morestack
 */

// Called during function prolog when more stack is needed.
// Caller has already loaded:
// R1: framesize, R2: argsize, R3: LR
//
// The traceback routines see morestack on a g0 as being
// the top of a stack (for example, morestack calling newstack
// calling the scheduler calling newm calling gc), so we must

// functions (int 3 on amd64) without crashing.
//
// Go will never generate a stack trace containing such an address, as it is
// not a valid call site. However, the cgo traceback function passed to
// runtime.SetCgoTraceback may not be completely accurate and may incorrect
// provide PCs in Go code or the alignment region between functions.
//

 */

// Called during function prolog when more stack is needed.
// Called with return address (i.e. caller's PC) in X5 (aka T0),
// and the LR register contains the caller's LR.
//
// The traceback routines see morestack on a g0 as being
// the top of a stack (for example, morestack calling newstack
// calling the scheduler calling newm calling gc), so we must

	UNDEF

/*
 * support for morestack
 */

// Called during function prolog when more stack is needed.
// Caller has already loaded:
// R3: framesize, R4: argsize, R5: LR
//
// The traceback routines see morestack on a g0 as being
// the top of a stack (for example, morestack calling newstack
// calling the scheduler calling newm calling gc), so we must

	// non-Go-created threads. Those stacks are written
	// to log the next time a normal Go thread gets the
	// signal handler.
	// Assuming the stacks are 2 words each (we don't get
	// a full traceback from those threads), plus one word
	// size for framing, 100 Hz profiling would generate
	// 300 words per second.
	// Hopefully a normal Go thread will get the profiling
	// signal at least once every few seconds.

	UNDEF

/*
 * support for morestack
 */

// Called during function prolog when more stack is needed.
// Caller has already loaded:
// R1: framesize, R2: argsize, R3: LR
//
// The traceback routines see morestack on a g0 as being
// the top of a stack (for example, morestack calling newstack
// calling the scheduler calling newm calling gc), so we must