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 // +build amd64 amd64p32
6 // +build gc
7
8 #include "textflag.h"
9
10 TEXT ·RewindAndSetgid(SB),NOSPLIT,$0-0
11 // Rewind stack pointer so anything that happens on the stack
12 // will clobber the test pattern created by the caller
13 ADDQ $(1024 * 8), SP
14
15 // Ask signaller to setgid
16 MOVL $1, ·Baton(SB)
17
18 // Wait for setgid completion
19 loop:
20 PAUSE
21 MOVL ·Baton(SB), AX
22 CMPL AX, $0
23 JNE loop
24
25 // Restore stack
26 SUBQ $(1024 * 8), SP
27 RET
28
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