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go/misc/cgo/test/issue9400/asm_arm64.s

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misc/cgo/test/issue9400: fix to build with gccgo This doesn't test much with gccgo, but at least it builds now, and the test does, unsurprisingly, pass. A proper test would require adding assembly files in GCC syntax for all platforms that gccgo supports, which would be infeasible. Also added copyright headers to the asm files. Change-Id: Icea5af29d7d521a0681506ddb617a79705b76d33 Reviewed-on: https://go-review.googlesource.com/9417 Reviewed-by: Minux Ma <minux@golang.org>
2015-04-28 18:58:17 -06:00
// 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
misc/cgo/test/issue9400: add arm64 implementation Change-Id: I309e3df7608b9eef9339196fdc50dedf5f9439f4 Reviewed-on: https://go-review.googlesource.com/8451 Reviewed-by: David Crawshaw <crawshaw@golang.org> Reviewed-by: Aram Hăvărneanu <aram@mgk.ro>
2015-04-03 02:37:24 -06:00
#include "textflag.h"
TEXT ·RewindAndSetgid(SB),NOSPLIT,$-8-0
// 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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