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// Copyright 2016 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.
//go:build (mips64 || mips64le) && gc
#include "textflag.h"
#define SYNC WORD $0xf
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), R29
// Ask signaller to setgid
MOVW $1, R1
SYNC
MOVW R1, ·Baton(SB)
SYNC
// Wait for setgid completion
loop:
SYNC
MOVW ·Baton(SB), R1
OR R2, R2, R2 // hint that we're in a spin loop
BNE R1, loop
SYNC
// Restore stack
ADDV $(-1024*8), R29
RET
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