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1 /*
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196
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2 * Copyright 1999-2008 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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304
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26 #include "incls/_assembler_windows_x86.cpp.incl"
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0
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27
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28
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29 void MacroAssembler::int3() {
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30 emit_byte(0xCC);
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31 }
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32
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304
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33 #ifndef _LP64
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0
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34 // The current scheme to accelerate access to the thread
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35 // pointer is to store the current thread in the os_exception_wrapper
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36 // and reference the current thread from stubs and compiled code
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37 // via the FS register. FS[0] contains a pointer to the structured
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38 // exception block which is actually a stack address. The first time
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39 // we call the os exception wrapper, we calculate and store the
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40 // offset from this exception block and use that offset here.
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41 //
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42 // The last mechanism we used was problematic in that the
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43 // the offset we had hard coded in the VM kept changing as Microsoft
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44 // evolved the OS.
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45 //
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46 // Warning: This mechanism assumes that we only attempt to get the
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47 // thread when we are nested below a call wrapper.
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48 //
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49 // movl reg, fs:[0] Get exeception pointer
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50 // movl reg, [reg + thread_ptr_offset] Load thread
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51 //
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52 void MacroAssembler::get_thread(Register thread) {
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53 // can't use ExternalAddress because it can't take NULL
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54 AddressLiteral null(0, relocInfo::none);
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55
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56 prefix(FS_segment);
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57 movptr(thread, null);
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58 assert(ThreadLocalStorage::get_thread_ptr_offset() != 0,
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59 "Thread Pointer Offset has not been initialized");
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60 movl(thread, Address(thread, ThreadLocalStorage::get_thread_ptr_offset()));
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61 }
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304
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62 #else
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63 // call (Thread*)TlsGetValue(thread_index());
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64 void MacroAssembler::get_thread(Register thread) {
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65 if (thread != rax) {
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66 push(rax);
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67 }
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68 push(rdi);
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69 push(rsi);
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70 push(rdx);
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71 push(rcx);
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72 push(r8);
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73 push(r9);
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74 push(r10);
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75 // XXX
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76 mov(r10, rsp);
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77 andq(rsp, -16);
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78 push(r10);
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79 push(r11);
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80
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81 movl(c_rarg0, ThreadLocalStorage::thread_index());
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82 call(RuntimeAddress((address)TlsGetValue));
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83
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84 pop(r11);
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85 pop(rsp);
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86 pop(r10);
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87 pop(r9);
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88 pop(r8);
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89 pop(rcx);
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90 pop(rdx);
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91 pop(rsi);
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92 pop(rdi);
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93 if (thread != rax) {
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94 mov(thread, rax);
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95 pop(rax);
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96 }
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97 }
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98 #endif
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