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// Copyright 2022 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.
#include "textflag.h"
TEXT ·RewindAndSetgid(SB),NOSPLIT|NOFRAME,$0-0
// Rewind stack pointer so anything that happens on the stack
// will clobber the test pattern created by the caller
ADDV $(1024*8), R3
// Ask signaller to setgid
MOVW $1, R12
DBAR
MOVW R12, ·Baton(SB)
DBAR
// Wait for setgid completion
loop:
DBAR
MOVW ·Baton(SB), R12
OR R13, R13, R13 // hint that we're in a spin loop
BNE R12, loop
DBAR
// Restore stack
ADDV $(-1024*8), R3
RET
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