#define NOOP	MOVW    R0, R0
#define	INVOKE_SYSCALL	\
	SWI	$0;	\
	NOOP;		\
	NOOP

// mstart_stub is the first function executed on a new thread started by pthread_create.
// It just does some low-level setup and then calls mstart.
// Note: called with the C calling convention.
TEXT runtime·mstart_stub(SB),NOSPLIT,$0
	// R0 points to the m.
	// We are already on m's g0 stack.

	// Save callee-save registers.
	MOVM.DB.W [R4-R11], (R13)

	// Nothing to do, pthread already set thread-local storage up.
	RET

// mstart_stub is the first function executed on a new thread started by pthread_create.
// It just does some low-level setup and then calls mstart.
// Note: called with the C calling convention.
TEXT runtime·mstart_stub(SB),NOSPLIT,$28
	NOP	SP	// tell vet SP changed - stop checking offsets

	// We are already on m's g0 stack.

	// Save callee-save registers.

	var oset sigset
	sigprocmask(_SIG_SETMASK, &sigset_all, &oset)
	ret := retryOnEAGAIN(func() int32 {
		r := clone(cloneFlags, stk, unsafe.Pointer(mp), unsafe.Pointer(mp.g0), unsafe.Pointer(abi.FuncPCABI0(mstart)))
		// clone returns positive TID, negative errno.
		// We don't care about the TID.
		if r >= 0 {
			return 0
		}
		return -r
	})
	sigprocmask(_SIG_SETMASK, &oset, nil)

	if ret != 0 {

	goSigStack    gsignalStack      // Go-allocated signal handling stack
	sigmask       sigset            // storage for saved signal mask
	tls           [tlsSlots]uintptr // thread-local storage (for x86 extern register)
	mstartfn      func()
	curg          *g       // current running goroutine
	caughtsig     guintptr // goroutine running during fatal signal
	p             puintptr // attached p for executing go code (nil if not executing go code)

			for i, stk := range acceptStacks {
				if goexperiment.StaticLockRanking {
					if !slices.ContainsFunc(stk, func(s string) bool {
						return s == "runtime.systemstack" || s == "runtime.mcall" || s == "runtime.mstart"
					}) {
						// stk is a call stack that is still on the user stack when
						// it calls runtime.unlock. Add the extra function that
						// we'll see, when the static lock ranking implementation of

// trapped instruction, so this returns frame.pc. See issue #34123. Finally,
// frame.pc can be at function entry when the frame is initialized without
// actually running code, like in runtime.mstart, in which case this returns
// frame.pc because that's the best we can do.
func (u *unwinder) symPC() uintptr {
	if u.flags&unwindTrap == 0 && u.frame.pc > u.frame.fn.entry() {
		// Regular call.
		return u.frame.pc - 1

	// create a new goroutine to start program
	MOVQ	$runtime·mainPC(SB), AX		// entry
	PUSHQ	AX
	CALL	runtime·newproc(SB)
	POPQ	AX

	// start this M
	CALL	runtime·mstart(SB)

	CALL	runtime·abort(SB)	// mstart should never return
	RET

bad_cpu: // show that the program requires a certain microarchitecture level.
	MOVQ	$2, 0(SP)
	MOVQ	$bad_cpu_msg<>(SB), AX
	MOVQ	AX, 8(SP)
	MOVQ	$84, 16(SP)