Eq("a", "loop2", "exit1"),
		),
		Bloc("loop2",
			Eq("a", "loop1", "exit2"),
		),
		Bloc("exit1",
			// store before call, y is available in a register
			Valu("mem2", OpAMD64MOVQstore, types.TypeMem, 0, nil, "p", "y", "mem"),
			Valu("mem3", OpAMD64CALLstatic, types.TypeMem, 0, AuxCallLSym("_"), "mem2"),
			Exit("mem3"),
		),
		Bloc("exit2",

	MOVW	R0, m_procid(R8)

nog:
	// Call fn
	MOVW	8(R13), R0
	MOVW	$16(R13), R13
	BL	(R0)

	// It shouldn't return. If it does, exit that thread.
	SUB	$16, R13 // restore the stack pointer to avoid memory corruption
	MOVW	$0, R0
	MOVW	R0, 4(R13)
	BL	exit1<>(SB)

	MOVW	$1234, R0
	MOVW	$1005, R1
	MOVW	R0, (R1)

TEXT runtime·sigaltstack(SB),NOSPLIT,$0
	MOVW	new+0(FP), R0
	MOVW	old+4(FP), R1

	if resetLibcall {
		mp.libcallsp = 0
	}

	return c.r1, c.err
}

func exit1(code int32)

//go:nosplit
func exit(code int32) {
	gp := getg()

	// Check the validity of g because without a g during
	// newosproc0.
	if gp != nil {
		syscall1(&libc_exit, uintptr(code))
		return
	}
	exit1(code)
}

func write2(fd, p uintptr, n int32) int32

//go:nosplit

	INT $3	// not reached
	RET

TEXT exit1<>(SB),NOSPLIT,$0
	MOVL	$SYS_exit, AX
	MOVL	code+0(FP), BX
	INVOKE_SYSCALL
	INT $3	// not reached
	RET

// func exitThread(wait *atomic.Uint32)
TEXT runtime·exitThread(SB),NOSPLIT,$0-4
	MOVL	wait+0(FP), AX
	// We're done using the stack.
	MOVL	$0, (AX)
	MOVL	$1, AX	// exit (just this thread)
	MOVL	$0, BX	// exit code
	INT	$0x80	// no stack; must not use CALL

import (
	"sync"
	_ "unsafe" // for linkname
)

// PanicOnExit0 reports whether to panic on a call to os.Exit(0).
// This is in the testlog package because, like other definitions in
// package testlog, it is a hook between the testing package and the
// os package. This is used to ensure that an early call to os.Exit(0)
// does not cause a test to pass.
func PanicOnExit0() bool {
	panicOnExit0.mu.Lock()
	defer panicOnExit0.mu.Unlock()

	}
	atExitFuncs = nil
}

// Exit exits with code after executing all atExitFuncs.
func Exit(code int) {
	runAtExitFuncs()
	os.Exit(code)
}

// Exitf logs an error message then calls Exit(2).
func Exitf(format string, a ...interface{}) {
	fmt.Fprintf(os.Stderr, os.Args[0]+": "+format+"\n", a...)
	nerrors++
	if *flagH {
		panic("error")
	}
	Exit(2)
}

[short] skip

env GO111MODULE=on

# If a test invoked by 'go test' exits with a zero status code,
# it will panic.
! go test ./zero
! stdout ^ok
! stdout 'exit status'
stdout 'panic'
stdout ^FAIL

# If a test exits with a non-zero status code, 'go test' fails normally.
! go test ./one
! stdout ^ok
stdout 'exit status'
! stdout 'panic'
stdout ^FAIL

# Ensure that other flags still do the right thing.

# a test that exits with an I/O stream held open
# should fail after a reasonable delay, not wait forever.
# (As of the time of writing, that delay is 10% of the timeout,
# but this test does not depend on its specific value.)

[short] skip 'runs a test that hangs until its WaitDelay expires'

! go test -v -timeout=1m .

	# After the test process itself prints PASS and exits,

! stdout '"Test":.*\n\z'

# 'go test -json' should say a test passes if it exits 0 and prints nothing.
# TODO(golang.org/issue/29062): this should fail in the future.
go test -json ./exit0main
stdout '"Action":"pass".*\n\z'
! stdout '"Test":.*\n\z'

# 'go test -json' should say a test fails if it exits 1 and prints nothing.
! go test -json ./exit1main
stdout '"Action":"fail".*\n\z'
! stdout '"Test":.*\n\z'

      ops::internal::Enter(root.WithOpName("enter_0"), a, "frame_0");
  Output exit_0 = ops::internal::Exit(root.WithOpName("exit_0"), enter_0);
  Output enter_1 =
      ops::internal::Enter(root.WithOpName("enter_1"), a, "frame_1");
  Output exit_1 = ops::internal::Exit(root.WithOpName("exit_1"), enter_1);
  Output b = ops::Add(root.WithOpName("b"), a, exit_1);

  FixupSourceAndSinkEdges(root.graph());

  GraphCycles cycles;