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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build amd64 amd64p32
// +build gc
#include "textflag.h"
TEXT ·RewindAndSetgid(SB),NOSPLIT,$0-0
// Rewind stack pointer so anything that happens on the stack
// will clobber the test pattern created by the caller
ADDQ $(1024 * 8), SP
// Ask signaller to setgid
MOVL $1, ·Baton(SB)
// Wait for setgid completion
loop:
PAUSE
MOVL ·Baton(SB), AX
CMPL AX, $0
JNE loop
// Restore stack
SUBQ $(1024 * 8), SP
RET
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