1// Copyright 2016 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// +build !gccgo
6
7#include "textflag.h"
8
9TEXT ·RewindAndSetgid(SB),NOSPLIT,$0-0
10	// Rewind stack pointer so anything that happens on the stack
11	// will clobber the test pattern created by the caller
12	ADD	$(1024 * 8), R15
13
14	// Ask signaller to setgid
15	MOVD	$·Baton(SB), R5
16	MOVW	$1, 0(R5)
17
18	// Wait for setgid completion
19loop:
20	SYNC
21	MOVW	·Baton(SB), R3
22	CMPBNE	R3, $0, loop
23
24	// Restore stack
25	SUB	$(1024 * 8), R15
26	RET
27