MOVL	$·Baton(SB), BX
	// Rewind stack pointer so anything that happens on the stack
	// will clobber the test pattern created by the caller
	ADDL	$(1024 * 8), SP

	// Ask signaller to setgid
	MOVL	$1, (BX)

	// Wait for setgid completion
loop:
	PAUSE
	MOVL	(BX), AX
	CMPL	AX, $0
	JNE	loop

	// Restore stack
	SUBL	$(1024 * 8), SP

	// Rewind stack pointer so anything that happens on the stack
	// will clobber the test pattern created by the caller
	ADD	$(1024 * 8), R15

	// Ask signaller to setgid
	MOVD	$·Baton(SB), R5
	MOVW	$1, 0(R5)

	// Wait for setgid completion
loop:
	SYNC
	MOVW	·Baton(SB), R3
	CMPBNE	R3, $0, loop

	// Restore stack
	SUB	$(1024 * 8), R15

	// Rewind stack pointer so anything that happens on the stack
	// will clobber the test pattern created by the caller
	ADDV	$(1024*8), R3

	// Ask signaller to setgid
	MOVW	$1, R12
	DBAR
	MOVW	R12, ·Baton(SB)
	DBAR

	// Wait for setgid completion
loop:
	DBAR
	MOVW	·Baton(SB), R12
	OR	R13, R13, R13	// hint that we're in a spin loop
	BNE	R12, loop
	DBAR

	// Restore stack
	ADDV	$(-1024*8), R3

TEXT ·RewindAndSetgid(SB),NOSPLIT,$0-0
	// Rewind stack pointer so anything that happens on the stack
	// will clobber the test pattern created by the caller
	ADDQ	$(1024 * 8), SP

	// Ask signaller to setgid
	MOVL	$1, ·Baton(SB)

	// Wait for setgid completion
loop:
	PAUSE
	MOVL	·Baton(SB), AX
	CMPL	AX, $0
	JNE	loop

	// Restore stack
	SUBQ	$(1024 * 8), SP

	// will clobber the test pattern created by the caller
	ADD	$(1024 * 8), RSP

	// Ask signaller to setgid
	MOVD	$·Baton(SB), R0
	MOVD	$1, R1
storeloop:
	LDAXRW	(R0), R2
	STLXRW	R1, (R0), R3
	CBNZ	R3, storeloop

	// Wait for setgid completion
	MOVW	$0, R1
	MOVW	$0, R2
loop:
	LDAXRW	(R0), R3
	CMPW	R1, R3
	BNE	loop
	STLXRW	R2, (R0), R3
	CBNZ	R3, loop

	// BSD mkdir(2) inherits the parent directory group, and other platforms
	// can inherit the parent directory group via setgid. The test setup (chmod
	// setgid) will fail if the process does not have the group permission to
	// the new temporary directory.
	err = os.Chown(setgiddir, os.Getuid(), os.Getgid())
	if err != nil {
		if testenv.SyscallIsNotSupported(err) {
			t.Skip("skipping: chown is not supported on " + runtime.GOOS)

	// chown lives, but using 'su root -c' gives us the correct PATH.

	// buildTestProg uses os.MkdirTemp which creates directories with 0700, which prevents
	// setuid binaries from executing because of the missing g+rx, so we need to set the parent
	// directory to better permissions before anything else. We created this directory, so we
	// shouldn't need to do any privilege trickery.

    /**
     * Set the ID of this lifecycle, for identification in the mojo
     * descriptor.
     *
     * @param id a id object.
     */
    public void setId(String id) {
        this.id = id;
    } // -- void setId( String )

    /**
     * Set the phase mappings for this lifecycle.
     *
     * @param phases a phases object.
     */

	tl := ldr.CreateSymForUpdate("runtime.typelink", 0)
	tl.SetType(sym.STYPELINK)
	ldr.SetAttrLocal(tl.Sym(), true)
	tl.SetSize(int64(4 * len(typelinks)))
	tl.Grow(tl.Size())
	relocs := tl.AddRelocs(len(typelinks))
	for i, s := range typelinks {
		r := relocs.At(i)
		r.SetSym(s.Type)
		r.SetOff(int32(i * 4))
		r.SetSiz(4)
		r.SetType(objabi.R_ADDROFF)
	}

	ptrsize := ctxt.Arch.PtrSize

	ModeNamedPipe                                  // p: named pipe (FIFO)
	ModeSocket                                     // S: Unix domain socket
	ModeSetuid                                     // u: setuid
	ModeSetgid                                     // g: setgid
	ModeCharDevice                                 // c: Unix character device, when ModeDevice is set
	ModeSticky                                     // t: sticky