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1 /*
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2 * Copyright 1999-2003 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #include "incls/_precompiled.incl"
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26 #include "incls/_assembler_linux_x86_32.cpp.incl"
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27
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28 void MacroAssembler::int3() {
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29 call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));
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30 }
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31
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32 void MacroAssembler::get_thread(Register thread) {
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33 movl(thread, rsp);
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34 shrl(thread, PAGE_SHIFT);
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35
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36 ExternalAddress tls_base((address)ThreadLocalStorage::sp_map_addr());
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37 Address index(noreg, thread, Address::times_4);
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38 ArrayAddress tls(tls_base, index);
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39
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40 movptr(thread, tls);
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41 }
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42
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43 bool MacroAssembler::needs_explicit_null_check(int offset) {
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44 // Linux kernel guarantees that the first page is always unmapped. Don't
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45 // assume anything more than that.
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46 bool offset_in_first_page = 0 <= offset && offset < os::vm_page_size();
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47 return !offset_in_first_page;
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48 }
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