1// Copyright 2014 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 (ppc64 || ppc64le) && 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 ADD $(1024 * 8), R1
13
14 // Ask signaller to setgid
15 MOVW $1, R3
16 SYNC
17 MOVW R3, ·Baton(SB)
18
19 // Wait for setgid completion
20loop:
21 SYNC
22 MOVW ·Baton(SB), R3
23 CMP R3, $0
24 // Hint that we're in a spin loop
25 OR R1, R1, R1
26 BNE loop
27 ISYNC
28
29 // Restore stack
30 SUB $(1024 * 8), R1
31 RET
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