// won't get to see who faulted.)
	// Also don't push a sigpanic frame if the faulting PC
	// is the entry of asyncPreempt. In this case, we suspended
	// the thread right between the fault and the exception handler
	// starting to run, and we have pushed an asyncPreempt call.
	// The exception is not from asyncPreempt, so not to push a
	// sigpanic call to make it look like that. Instead, just

func addmoduledata()

// Injected by the signal handler for panicking signals.
// Initializes any registers that have fixed meaning at calls but
// are scratch in bodies and calls sigpanic.
// On many platforms it just jumps to sigpanic.
func sigpanic0()

// intArgRegs is used by the various register assignment
// algorithm implementations in the runtime. These include:.
// - Finalizers (mfinal.go)

// instead.
//
// This must NOT be nosplit because the linker doesn't know where
// sigpanic calls can be injected.
//
// The signal handler must not inject a call to sigpanic if
// getg().throwsplit, since sigpanic may need to grow the stack.
//
// This is exported via linkname to assembly in runtime/cgo.
//
//go:linkname sigpanic
func sigpanic() {
	gp := getg()
	if !canpanic() {

		return false
	}
	releasem(mp)
	return true
}

// shouldPushSigpanic reports whether pc should be used as sigpanic's
// return PC (pushing a frame for the call). Otherwise, it should be
// left alone so that LR is used as sigpanic's return PC, effectively
// replacing the top-most frame with sigpanic. This is used by
// preparePanic.
func shouldPushSigpanic(gp *g, pc, lr uintptr) bool {
	if pc == 0 {

	}
}

func TestCgoTracebackSigpanic(t *testing.T) {
	// Test unwinding over a sigpanic in C code without a C
	// symbolizer. See issue #23576.
	if runtime.GOOS == "windows" {
		// On Windows if we get an exception in C code, we let
		// the Windows exception handler unwind it, rather
		// than injecting a sigpanic.
		t.Skip("no sigpanic in C on windows")
	}
	if runtime.GOOS == "ios" {
		testenv.SkipFlaky(t, 59912)
	}

	// at runtime.sigpanic, because non-open-coded defers (which may be used in
	// non-opt or race checker mode) include an extra 'deferreturn' frame (which is
	// where the nil pointer deref happens).
	state := 1
	want := []string{"runtime.Callers", "runtime_test.TestCallersDeferNilFuncPanic.func1",
		"runtime.gopanic", "runtime.panicmem", "runtime.sigpanic"}

	defer func() {

	//   and this is the return PC (just after the CALL
	//   instruction). In this case, pc-1 reflects the CALL
	//   instruction itself and is the correct source of symbolic
	//   information.
	//
	// - If this frame "called" sigpanic, then pc is the
	//   instruction that panicked, and pc is the correct address
	//   to use for symbolic information.
	//
	// - If this is the innermost frame, then PC is where

func nsec(*int64) int64

//go:noescape
func sigtramp(ureg, note unsafe.Pointer)

func setfpmasks()

//go:noescape
func tstart_plan9(newm *m)

func errstr() string

type _Plink uintptr

func sigpanic() {
	gp := getg()
	if !canpanic() {
		throw("unexpected signal during runtime execution")
	}

	note := gostringnocopy((*byte)(unsafe.Pointer(gp.m.notesig)))
	switch gp.sig {
	case _SIGRFAULT, _SIGWFAULT:

		// Check a simple case of inlining
		r := ttiSimple1()
		check(t, r, "runtime_test.ttiSimple3(...)", "runtime_test.ttiSimple2(...)", "runtime_test.ttiSimple1()")
	})

	t.Run("sigpanic", func(t *testing.T) {
		// Check that sigpanic from an inlined function prints correctly
		r := ttiSigpanic1()

func printDebugLogPC(pc uintptr, returnPC bool) {
	fn := findfunc(pc)
	if returnPC && (!fn.valid() || pc > fn.entry()) {
		// TODO(austin): Don't back up if the previous frame
		// was a sigpanic.
		pc--
	}

	print(hex(pc))
	if !fn.valid() {
		print(" [unknown PC]")
	} else {
		name := funcname(fn)
		file, line := funcline(fn, pc)
		print(" [", name, "+", hex(pc-fn.entry()),