// 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)