Plan 9 from Bell Labs’s /usr/web/sources/contrib/stallion/root/arm/go/misc/cgo/test/testdata/issue9400/asm_s390x.s

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Distributed under the MIT License.
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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.

// +build !gccgo

#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
	ADD	$(1024 * 8), R15

	// Ask signaller to setgid
	MOVD	$·Baton(SB), R5
	MOVW	$1, 0(R5)

	// Wait for setgid completion
loop:
	SYNC
	MOVW	·Baton(SB), R3
	CMPBNE	R3, $0, loop

	// Restore stack
	SUB	$(1024 * 8), R15
	RET

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