MOVL	AX, g(CX)
	MOVL	(g_sched+gobuf_sp)(AX), SP
	MOVL	$0, (g_sched+gobuf_sp)(AX)
	RET

noswitch:
	// already on system stack; tail call the function
	// Using a tail call here cleans up tracebacks since we won't stop
	// at an intermediate systemstack.
	MOVL	DI, DX
	MOVL	0(DI), DI
	JMP	DI

bad:
	// Bad: g is not gsignal, not g0, not curg. What is it?
	// Hide call from linker nosplit analysis.

	// 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.

// memory. It checks whether that Go memory contains any other
// pointer into unpinned Go memory. If it does, we panic.
// The return values are unused but useful to see in panic tracebacks.
func cgoCheckUnknownPointer(p unsafe.Pointer, msg string) (base, i uintptr) {
	if inheap(uintptr(p)) {
		b, span, _ := findObject(uintptr(p), 0, 0)
		base = b
		if base == 0 {
			return
		}

// printpanicval prints an argument passed to panic.
// If panic is called with a value that has a String or Error method,
// it has already been converted into a string by preprintpanics.
//
// To ensure that the traceback can be unambiguously parsed even when
// the panic value contains "\ngoroutine" and other stack-like
// strings, newlines in the string representation of v are replaced by
// "\n\t".
func printpanicval(v any) {

			// it is a leaf function, so that traceback works.
			q = p
			if c.autosize > aoffset {
				// Frame size is too large for a MOVD.W instruction. Store the frame pointer
				// register and link register before decrementing SP, so if a signal comes
				// during the execution of the function prologue, the traceback code will
				// not see a half-updated stack frame.

	if setStack {
		restoreGsignalStack(&gsignalStack)
	}
}

// If the signal handler receives a SIGPROF signal on a non-Go thread,
// it tries to collect a traceback into sigprofCallers.
// sigprofCallersUse is set to non-zero while sigprofCallers holds a traceback.
var sigprofCallers cgoCallers
var sigprofCallersUse uint32

// sigprofNonGo is called if we receive a SIGPROF signal on a non-Go thread,

	// so switch to g0.

	MOVL	SP, BP	// Save old SP; BP unchanged by C code.

	get_tls(CX)
	MOVL	g(CX), AX
	MOVL	g_m(AX), SI // SI unchanged by C code.

	// Set vdsoPC and vdsoSP for SIGPROF traceback.
	// Save the old values on stack and restore them on exit,
	// so this function is reentrant.
	MOVL	m_vdsoPC(SI), CX
	MOVL	m_vdsoSP(SI), DX
	MOVL	CX, 0(SP)
	MOVL	DX, 4(SP)

	LEAL	sec+0(FP), DX

			q = p

			if autosize != 0 {
				// Make sure to save link register for non-empty frame, even if
				// it is a leaf function, so that traceback works.
				// Store link register before decrement SP, so if a signal comes
				// during the execution of the function prologue, the traceback
				// code will not see a half-updated stack frame.
				// This sequence is not async preemptible, as if we open a frame

// to telemetry.go.dev.
//
// If [Config.ReportCrashes] is set, any fatal crash will be
// recorded by incrementing a counter named for the stack of the
// first running goroutine in the traceback.
//
// If either of these flags is set, Start re-executes the current
// executable as a child process, in a special mode in which it
// acts as a telemetry sidecar for the parent process (the application).

//
// The heap dump format is defined at https://golang.org/s/go15heapdump.
func WriteHeapDump(fd uintptr)

// SetTraceback sets the amount of detail printed by the runtime in
// the traceback it prints before exiting due to an unrecovered panic
// or an internal runtime error.
// The level argument takes the same values as the GOTRACEBACK
// environment variable. For example, SetTraceback("all") ensure