Mercurial > hg > release > icedtea7-forest-2.1 > hotspot
view src/os_cpu/linux_zero/vm/os_linux_zero.hpp @ 2950:f293db049783
Use ldrexd for atomic reads on ARMv7.
2012-05-28 Andrew Haley <aph@redhat.com>
* os_linux_zero.hpp (atomic_copy64): Use ldrexd for atomic reads
on ARMv7.
author | aph |
---|---|
date | Mon, 28 May 2012 08:01:18 -0400 |
parents | 7f338a5e5e66 |
children |
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/* * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright 2007, 2008, 2010 Red Hat, Inc. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef OS_CPU_LINUX_ZERO_VM_OS_LINUX_ZERO_HPP #define OS_CPU_LINUX_ZERO_VM_OS_LINUX_ZERO_HPP static void setup_fpu() {} static bool is_allocatable(size_t bytes); // Used to register dynamic code cache area with the OS // Note: Currently only used in 64 bit Windows implementations static bool register_code_area(char *low, char *high) { return true; } // Atomically copy 64 bits of data static void atomic_copy64(volatile void *src, volatile void *dst) { #if defined(PPC) && !defined(_LP64) double tmp; asm volatile ("lfd %0, 0(%1)\n" "stfd %0, 0(%2)\n" : "=f"(tmp) : "b"(src), "b"(dst)); #elif defined(S390) && !defined(_LP64) double tmp; asm volatile ("ld %0, 0(%1)\n" "std %0, 0(%2)\n" : "=r"(tmp) : "a"(src), "a"(dst)); #elif defined(__ARM_ARCH_7A__) jlong tmp; asm volatile ("ldrexd %0, [%1]\n" : "=r"(tmp) : "r"(src), "m"(src)); *(jlong *) dst = tmp; #else *(jlong *) dst = *(jlong *) src; #endif } #endif // OS_CPU_LINUX_ZERO_VM_OS_LINUX_ZERO_HPP