Plan 9 from Bell Labs’s /usr/web/sources/contrib/stallion/root/arm/go/misc/cgo/test/testdata/issue9400/asm_arm64.s

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Distributed under the MIT License.
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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 !gccgo

#include "textflag.h"

TEXT ·RewindAndSetgid(SB),NOSPLIT|NOFRAME,$0-0
	// Save link register
	MOVD	R30, R9

	// Rewind stack pointer so anything that happens on the stack
	// will clobber the test pattern created by the caller
	ADD	$(1024 * 8), RSP

	// Ask signaller to setgid
	MOVD	$·Baton(SB), R0
	MOVD	$1, R1
storeloop:
	LDAXRW	(R0), R2
	STLXRW	R1, (R0), R3
	CBNZ	R3, storeloop

	// Wait for setgid completion
	MOVW	$0, R1
	MOVW	$0, R2
loop:
	LDAXRW	(R0), R3
	CMPW	R1, R3
	BNE	loop
	STLXRW	R2, (R0), R3
	CBNZ	R3, loop

	// Restore stack
	SUB	$(1024 * 8), RSP

	MOVD	R9, R30
	RET

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