#define STACK_SIZE_PARAM_IS_A_RESERVATION 0x00010000
#endif

typedef void callback(char*);

// Allocate a stack that's much larger than the default.
static const int STACK_SIZE = 16<<20;

static callback *bigStackCallback;

static void useStack(int bytes) {
	// Windows doesn't like huge frames, so we grow the stack 64k at a time.
	char x[64<<10];
	if (bytes < sizeof x) {
		bigStackCallback(x);
	} else {

	// Now on a scheduling stack (a pthread-created stack).
g0:
	// Save room for two of our pointers.
	SUB	$16, X2
	MOV	X9, 0(X2)	// save old g on stack
	MOV	(g_stack+stack_hi)(X9), X9
	SUB	X8, X9, X8
	MOV	X8, 8(X2)	// save depth in old g stack (can't just save SP, as stack might be copied during a callback)

	JALR	RA, (X5)

	// Restore g, stack pointer. X10 is return value.
	MOV	0(X2), g

	JMP	asancall<>(SB)

// Switches SP to g0 stack and calls (FARG). Arguments already set.
TEXT	asancall<>(SB), NOSPLIT, $0-0
	MOVV	R3, R23         // callee-saved
	BEQ	g, g0stack      // no g, still on a system stack
	MOVV	g_m(g), R14
	MOVV	m_g0(R14), R15
	BEQ	R15, g, g0stack

	MOVV	(g_sched+gobuf_sp)(R15), R9
	MOVV	R9, R3

g0stack:
	JAL	(FARG)
	MOVV	R23, R3

	MOV	$__asan_register_globals_go(SB), X14
	JMP	asancall<>(SB)

// Switches SP to g0 stack and calls (X14). Arguments already set.
TEXT	asancall<>(SB), NOSPLIT, $0-0
	MOV	X2, X8		// callee-saved
	BEQZ	g, g0stack	// no g, still on a system stack
	MOV	g_m(g), X21
	MOV	m_g0(X21), X21
	BEQ	X21, g, g0stack

	MOV	(g_sched+gobuf_sp)(X21), X2

g0stack:
	JALR	RA, X14
	MOV	X8, X2

	JMP	msancall<>(SB)

// Switches SP to g0 stack and calls (FARG). Arguments already set.
TEXT	msancall<>(SB), NOSPLIT, $0-0
	MOVV	R3, R23         // callee-saved
	BEQ	g, g0stack      // no g, still on a system stack
	MOVV	g_m(g), R14
	MOVV	m_g0(R14), R15
	BEQ	R15, g, g0stack

	MOVV	(g_sched+gobuf_sp)(R15), R9
	MOVV	R9, R3

g0stack:
	JAL	(FARG)
	MOVV	R23, R3

apiVersion: release-notes/v2
kind: feature
area: installation
releaseNotes:
- |

	//
	// An event may not be both a timed event and have data.
	HasData bool

	// IsStack indicates that the event represents a complete
	// stack trace. Specifically, it means that after the arguments
	// there's a varint length, followed by 4*length varints. Each
	// group of 4 represents the PC, file ID, func ID, and line number
	// in that order.
	IsStack bool

	// Experiment indicates the ID of an experiment this event is associated

	RET

//func tstart_plan9(newm *m)
TEXT runtime·tstart_plan9(SB),NOSPLIT,$4-4
	MOVW	newm+0(FP), R1
	MOVW	m_g0(R1), g

	// Layout new m scheduler stack on os stack.
	MOVW	R13, R0
	MOVW	R0, g_stack+stack_hi(g)
	SUB	$(64*1024), R0
	MOVW	R0, (g_stack+stack_lo)(g)
	MOVW	R0, g_stackguard0(g)
	MOVW	R0, g_stackguard1(g)

	// Initialize procid from TOS struct.
	MOVW	_tos(SB), R0
	MOVW	48(R0), R0

	w.buf = append(w.buf, uint8(e.Ev))

	// Write out all arguments.
	spec := w.specs[e.Ev]
	for _, arg := range e.Args[:len(spec.Args)] {
		w.buf = binary.AppendUvarint(w.buf, arg)
	}
	if spec.IsStack {
		frameArgs := e.Args[len(spec.Args):]
		for i := 0; i < len(frameArgs); i++ {
			w.buf = binary.AppendUvarint(w.buf, frameArgs[i])
		}
	}

	// Write out the length of the data.
	if spec.HasData {

	var s strings.Builder
	s.WriteString(spec.Name)
	for i := range spec.Args {
		s.WriteString(" ")
		s.WriteString(spec.Args[i])
		s.WriteString("=")
		s.WriteString(strconv.FormatUint(e.Args[i], 10))
	}
	if spec.IsStack {
		frames := e.Args[len(spec.Args):]
		for i := 0; i < len(frames); i++ {
			if i%4 == 0 {
				s.WriteString("\n\t")
			} else {
				s.WriteString(" ")
			}
			s.WriteString(frameFields[i%4])