// The next few lines (after the havem label)
	// will save this SP onto the stack and then write
	// the same SP back to m->sched.sp. That seems redundant,
	// but if an unrecovered panic happens, unwindm will
	// restore the g->sched.sp from the stack location
	// and then systemstack will try to use it. If we don't set it here,
	// that restored SP will be uninitialized (typically 0) and
	// will not be usable.

// The code that cares about the precise instructions used is:
// https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libgcc/config/i386/linux-unwind.h;h=5486223d60272c73d5103b29ae592d2ee998e1cf#l136
//
// For gdb unwinding to work, this function must look precisely like the one in
// glibc and must be named "__restore_rt" or contain the string "sigaction" in

	// 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)
	}
	t.Parallel()

	MOVL	m_cgoCallersUse(AX), CX
	TESTL	CX, CX
	JNZ	sigtramp	// g.m.cgoCallersUse != 0

	// Jump to a function in runtime/cgo.
	// That function, written in C, will call the user's traceback
	// function with proper unwind info, and will then call back here.
	// The first three arguments, and the fifth, are already in registers.
	// Set the two remaining arguments now.
	MOVQ	runtime·cgoTraceback(SB), CX
	MOVQ	$runtime·sigtramp(SB), R9

		// Detect whether the fuzz test panicked or called runtime.Goexit
		// without calling F.Fuzz, F.Fail, or F.Skip. If it did, panic (possibly
		// replacing a nil panic value). Nothing should recover after fRunner
		// unwinds, so this should crash the process and print stack.
		// Unfortunately, recovering here adds stack frames, but the location of
		// the original panic should still be
		// clear.
		f.checkRaces()
		if f.Failed() {

		}
	}()
	nestedCall(t, func() { panic("callback panic") })
	panic("nestedCall returned")
}

func TestCallbackPanic(t *testing.T) {
	// Make sure panic during callback unwinds properly.
	if runtime.LockedOSThread() {
		t.Fatal("locked OS thread on entry to TestCallbackPanic")
	}
	defer func() {
		s := recover()
		if s == nil {
			t.Fatal("did not panic")
		}

	MatchFull []string // full match lines for the IDs, with match markers kept
}

// &searchFatal is a special panic value to signal that Search failed.
// This lets us unwind the search recursion on a fatal error
// but have Search return normally.
var searchFatal int

// Search runs a bisect search according to the configuration in b.
// It reports whether any failing change sets were found.

const (
	WasmI32 WasmFieldType = iota
	WasmI64
	WasmF32
	WasmF64
	WasmPtr
)

type InlMark struct {
	// When unwinding from an instruction in an inlined body, mark
	// where we should unwind to.
	// id records the global inlining id of the inlined body.
	// p records the location of an instruction in the parent (inliner) frame.
	p  *Prog
	id int32
}

	allResults := []*Value{}
	oldArgs := []*Value{}
	argsWithoutMem := v.Args[firstArg : len(v.Args)-1] // Also strip closure/interface Op-specific args

	sp := x.sp
	if v.Op == OpTailLECall {
		// For tail call, we unwind the frame before the call so we'll use the caller's
		// SP.
		sp = x.f.Entry.NewValue1(src.NoXPos, OpGetCallerSP, x.typs.Uintptr, mem)
	}

	// signal handler at a later time. When the signal handler is called, the
	// memory may have changed, but the signal context remains old. The
	// unmatched signal context and memory makes it unsafe to unwind or inspect
	// the stack. So we ignore delayed non-fatal signals that will cause a stack
	// inspection (profiling signal and preemption signal).
	// cgo_yield is only non-nil for TSAN, and is specifically used to trigger