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go/src/runtime/atomic_ppc64x.s

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[dev.power64] runtime: manually written parts for linux/power64 and linux/power64le, checkpoint LGTM=rsc R=rsc, iant CC=golang-codereviews https://golang.org/cl/122430043
2014-08-12 17:48:49 -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.
all: power64 is now ppc64 Fixes #8654. LGTM=austin R=austin CC=golang-codereviews https://golang.org/cl/180600043
2014-12-05 17:13:20 -07:00
// +build ppc64 ppc64le
[dev.power64] runtime: manually written parts for linux/power64 and linux/power64le, checkpoint LGTM=rsc R=rsc, iant CC=golang-codereviews https://golang.org/cl/122430043
2014-08-12 17:48:49 -06:00
[dev.power64] runtime: power64 fixes and ports of changes Fix include paths that got moved in the great pkg/ rename. Add missing runtime/arch_* files for power64. Port changes that happened on default since branching to runtime/{asm,atomic,sys_linux}_power64x.s (precise stacks, calling convention change, various new and deleted functions. Port struct renaming and fix some bugs in runtime/defs_linux_power64.h. LGTM=rsc R=rsc, dave CC=golang-codereviews https://golang.org/cl/161450043
2014-10-27 15:27:03 -06:00
#include "textflag.h"
[dev.power64] runtime: manually written parts for linux/power64 and linux/power64le, checkpoint LGTM=rsc R=rsc, iant CC=golang-codereviews https://golang.org/cl/122430043
2014-08-12 17:48:49 -06:00
cmd/internal/obj, runtime: add NOFRAME flag to suppress stack frame set up on ppc64x Replace the confusing game where a frame size of $-8 would suppress the implicit setting up of a stack frame with a nice explicit flag. The code to set up the function prologue is still a little confusing but better than it was. Change-Id: I1d49278ff42c6bc734ebfb079998b32bc53f8d9a Reviewed-on: https://go-review.googlesource.com/15670 Reviewed-by: Minux Ma <minux@golang.org>
2015-10-08 17:44:27 -06:00
TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
runtime: ensure GC sees type-safe memory on weak machines Currently its possible for the garbage collector to observe uninitialized memory or stale heap bitmap bits on weakly ordered architectures such as ARM and PPC. On such architectures, the stores that zero newly allocated memory and initialize its heap bitmap may move after a store in user code that makes the allocated object observable by the garbage collector. To fix this, add a "publication barrier" (also known as an "export barrier") before returning from mallocgc. This is a store/store barrier that ensures any write done by user code that makes the returned object observable to the garbage collector will be ordered after the initialization performed by mallocgc. No barrier is necessary on the reading side because of the data dependency between loading the pointer and loading the contents of the object. Fixes one of the issues raised in #9984. Change-Id: Ia3d96ad9c5fc7f4d342f5e05ec0ceae700cd17c8 Reviewed-on: https://go-review.googlesource.com/11083 Reviewed-by: Rick Hudson <rlh@golang.org> Reviewed-by: Dmitry Vyukov <dvyukov@google.com> Reviewed-by: Minux Ma <minux@golang.org> Reviewed-by: Martin Capitanio <capnm9@gmail.com> Reviewed-by: Russ Cox <rsc@golang.org>
2015-06-15 10:30:23 -06:00
// LWSYNC is the "export" barrier recommended by Power ISA
// v2.07 book II, appendix B.2.2.2.
// LWSYNC is a load/load, load/store, and store/store barrier.
WORD $0x7c2004ac // LWSYNC
RET
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