Mercurial > hg > truffle
comparison src/os_cpu/windows_x86/vm/assembler_windows_x86_32.cpp @ 0:a61af66fc99e jdk7-b24
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| author | duke |
|---|---|
| date | Sat, 01 Dec 2007 00:00:00 +0000 |
| parents | |
| children | 7793bd37a336 |
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| -1:000000000000 | 0:a61af66fc99e |
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| 1 /* | |
| 2 * Copyright 1999-2003 Sun Microsystems, Inc. All Rights Reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_assembler_windows_x86_32.cpp.incl" | |
| 27 | |
| 28 | |
| 29 void MacroAssembler::int3() { | |
| 30 emit_byte(0xCC); | |
| 31 } | |
| 32 | |
| 33 // The current scheme to accelerate access to the thread | |
| 34 // pointer is to store the current thread in the os_exception_wrapper | |
| 35 // and reference the current thread from stubs and compiled code | |
| 36 // via the FS register. FS[0] contains a pointer to the structured | |
| 37 // exception block which is actually a stack address. The first time | |
| 38 // we call the os exception wrapper, we calculate and store the | |
| 39 // offset from this exception block and use that offset here. | |
| 40 // | |
| 41 // The last mechanism we used was problematic in that the | |
| 42 // the offset we had hard coded in the VM kept changing as Microsoft | |
| 43 // evolved the OS. | |
| 44 // | |
| 45 // Warning: This mechanism assumes that we only attempt to get the | |
| 46 // thread when we are nested below a call wrapper. | |
| 47 // | |
| 48 // movl reg, fs:[0] Get exeception pointer | |
| 49 // movl reg, [reg + thread_ptr_offset] Load thread | |
| 50 // | |
| 51 void MacroAssembler::get_thread(Register thread) { | |
| 52 // can't use ExternalAddress because it can't take NULL | |
| 53 AddressLiteral null(0, relocInfo::none); | |
| 54 | |
| 55 prefix(FS_segment); | |
| 56 movptr(thread, null); | |
| 57 assert(ThreadLocalStorage::get_thread_ptr_offset() != 0, | |
| 58 "Thread Pointer Offset has not been initialized"); | |
| 59 movl(thread, Address(thread, ThreadLocalStorage::get_thread_ptr_offset())); | |
| 60 } | |
| 61 | |
| 62 bool MacroAssembler::needs_explicit_null_check(int offset) { | |
| 63 return offset < 0 || (int)os::vm_page_size() <= offset; | |
| 64 } |