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//go:build gc
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
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