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misc/cgo/test: add RewindAndSetgid implementation for s390x

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Required to pass the issue9400 test.

Change-Id: I595223c403b12faade54e2e46510f8537150af39
Reviewed-on: https://go-review.googlesource.com/20940
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Michael Munday 2016-03-20 22:00:06 -04:00 committed by Brad Fitzpatrick
parent 5f0935b7d4
commit c16a61515f
1 changed files with 26 additions and 0 deletions
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misc/cgo/test/issue9400/asm_s390x.s Normal file
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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