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annotate src/os_cpu/linux_zero/vm/os_linux_zero.hpp @ 14304:a2866d45e99e

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8027454: Do not traverse string table during G1 remark when treating them as strong roots during initial mark Summary: Do not try to unlink string table entries unconditionally during remark. This is without side effects as the preceding initial mark always uses the string table as strong roots. Needs to be fixed with class unloading during concurrent mark. Reviewed-by: brutisso, mgerdin
author tschatzl
date Mon, 20 Jan 2014 11:47:29 +0100
parents f95d63e2154a
children 0f03ff49c720
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1 /*
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2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * Copyright 2007, 2008, 2010 Red Hat, Inc.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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21 * or visit www.oracle.com if you need additional information or have any
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22 * questions.
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23 *
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24 */
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25
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26 #ifndef OS_CPU_LINUX_ZERO_VM_OS_LINUX_ZERO_HPP
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27 #define OS_CPU_LINUX_ZERO_VM_OS_LINUX_ZERO_HPP
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29 static void setup_fpu() {}
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31 static bool is_allocatable(size_t bytes);
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32
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33 // Used to register dynamic code cache area with the OS
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34 // Note: Currently only used in 64 bit Windows implementations
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35 static bool register_code_area(char *low, char *high) { return true; }
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36
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37 // Atomically copy 64 bits of data
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38 static void atomic_copy64(volatile void *src, volatile void *dst) {
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39 #if defined(PPC) && !defined(_LP64)
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40 double tmp;
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41 asm volatile ("lfd %0, 0(%1)\n"
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42 "stfd %0, 0(%2)\n"
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43 : "=f"(tmp)
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44 : "b"(src), "b"(dst));
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45 #elif defined(S390) && !defined(_LP64)
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46 double tmp;
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47 asm volatile ("ld %0, 0(%1)\n"
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48 "std %0, 0(%2)\n"
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49 : "=r"(tmp)
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50 : "a"(src), "a"(dst));
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51 #else
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52 *(jlong *) dst = *(jlong *) src;
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53 #endif
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54 }
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55
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56 #endif // OS_CPU_LINUX_ZERO_VM_OS_LINUX_ZERO_HPP