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 (mips || mipsle) && gc
6
7#include "textflag.h"
8
9TEXT ·RewindAndSetgid(SB),NOSPLIT|NOFRAME,$0-0
10 // Rewind stack pointer so anything that happens on the stack
11 // will clobber the test pattern created by the caller
12 ADDU $(1024*8), R29
13
14 // Ask signaller to setgid
15 MOVW $1, R1
16 SYNC
17 MOVW R1, ·Baton(SB)
18 SYNC
19
20 // Wait for setgid completion
21loop:
22 SYNC
23 MOVW ·Baton(SB), R1
24 OR R2, R2, R2 // hint that we're in a spin loop
25 BNE R1, loop
26 SYNC
27
28 // Restore stack
29 ADDU $(-1024*8), R29
30 RET
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