length.SetTypecheck(1)
	return ptr, length
}

// mayCall reports whether evaluating expression n may require
// function calls, which could clobber function call arguments/results
// currently on the stack.
func mayCall(n ir.Node) bool {
	// When instrumenting, any expression might require function calls.
	if base.Flag.Cfg.Instrumenting {
		return true
	}

	isSoftFloat := func(typ *types.Type) bool {

	pcdata := ctxt.EmitEntryStackMap(s, p, newprog)
	pcdata = ctxt.EmitEntryUnsafePoint(s, pcdata, newprog)
	return pcdata
}

// Similar to EmitEntryLiveness, but just emit stack map.
func (ctxt *Link) EmitEntryStackMap(s *LSym, p *Prog, newprog ProgAlloc) *Prog {
	pcdata := Appendp(p, newprog)
	pcdata.Pos = s.Func().Text.Pos
	pcdata.As = APCDATA
	pcdata.From.Type = TYPE_CONST

}

func TestStackOverflow(t *testing.T) {
	output := runTestProg(t, "testprog", "StackOverflow")
	want := []string{
		"runtime: goroutine stack exceeds 1474560-byte limit\n",
		"fatal error: stack overflow",
		// information about the current SP and stack bounds
		"runtime: sp=",
		"stack=[",
	}
	if !strings.HasPrefix(output, want[0]) {
		t.Errorf("output does not start with %q", want[0])
	}
	for _, s := range want[1:] {

//
// The heap lock must not be held over this operation, since it will briefly acquire
// the heap lock.
//
// Must be called on the system stack because it acquires the heap lock.
//
//go:systemstack
func (p *pageAlloc) enableChunkHugePages() {
	// Grab the heap lock to turn on huge pages for new chunks and clone the current
	// heap address space ranges.
	//

f7 16 nosplit call f8
f8 16 nosplit call end
end 1000
REJECT

# Two paths both go over the stack limit.
start 0 call f1
f1 80 nosplit call f2 call f3
f2 40 nosplit call f4
f3 96 nosplit
f4 40 nosplit
REJECT

# Test cases near the 128-byte limit.

# Ordinary stack split frame is always okay.
start 112
start 116
start 120
start 124
start 128
start 132
start 136

		return "reflect: call of " + e.Method + " on zero Value"
	}
	return "reflect: call of " + e.Method + " on " + e.Kind.String() + " Value"
}

// methodName returns the name of the calling method,
// assumed to be two stack frames above.
func methodName() string {
	pc, _, _, _ := runtime.Caller(2)
	f := runtime.FuncForPC(pc)
	if f == nil {
		return "unknown method"
	}
	return f.Name()
}

// Version of newosproc that doesn't require a valid G.
//
//go:nosplit
func newosproc0(stacksize uintptr, fn unsafe.Pointer) {
	stack := sysAlloc(stacksize, &memstats.stacks_sys)
	if stack == nil {
		writeErrStr(failallocatestack)
		exit(1)
	}
	ret := clone(cloneFlags, unsafe.Pointer(uintptr(stack)+stacksize), nil, nil, fn)
	if ret < 0 {
		writeErrStr(failthreadcreate)
		exit(1)
	}
}

const (

		}

		// Mark the stack bound check and morestack call async nonpreemptible.
		// If we get preempted here, when resumed the preemption request is
		// cleared, but we'll still call morestack, which will double the stack
		// unnecessarily. See issue #35470.
		p = ctxt.StartUnsafePoint(p, newprog)
	} else if framesize <= abi.StackBig {
		// large stack: SP-framesize <= stackguard-StackSmall

	REGCTXT = REG_R26 // environment for closures
	REGTMP  = REG_R27 // reserved for liblink
	REGG    = REG_R28 // G
	REGFP   = REG_R29 // frame pointer
	REGLINK = REG_R30

	// ARM64 uses R31 as both stack pointer and zero register,
	// depending on the instruction. To differentiate RSP from ZR,
	// we use a different numeric value for REGZERO and REGSP.
	REGZERO = REG_R31
	REGSP   = REG_RSP

	FREGRET = REG_F0

	{11, "SIGSEGV", "segmentation fault"},
	{12, "SIGUSR2", "user defined signal 2"},
	{13, "SIGPIPE", "broken pipe"},
	{14, "SIGALRM", "alarm clock"},
	{15, "SIGTERM", "terminated"},
	{16, "SIGSTKFLT", "stack fault"},
	{17, "SIGCHLD", "child exited"},
	{18, "SIGCONT", "continued"},
	{19, "SIGSTOP", "stopped (signal)"},
	{20, "SIGTSTP", "stopped"},
	{21, "SIGTTIN", "stopped (tty input)"},