1 /* 2 * Copyright (c) 1999, 2008, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "incls/_precompiled.incl" 26 #include "incls/_assembler_windows_x86.cpp.incl" 27 28 29 void MacroAssembler::int3() { 30 emit_byte(0xCC); 31 } 32 33 #ifndef _LP64 34 // The current scheme to accelerate access to the thread 35 // pointer is to store the current thread in the os_exception_wrapper 36 // and reference the current thread from stubs and compiled code 37 // via the FS register. FS[0] contains a pointer to the structured 38 // exception block which is actually a stack address. The first time 39 // we call the os exception wrapper, we calculate and store the 40 // offset from this exception block and use that offset here. 41 // 42 // The last mechanism we used was problematic in that the 43 // the offset we had hard coded in the VM kept changing as Microsoft 44 // evolved the OS. 45 // 46 // Warning: This mechanism assumes that we only attempt to get the 47 // thread when we are nested below a call wrapper. 48 // 49 // movl reg, fs:[0] Get exeception pointer 50 // movl reg, [reg + thread_ptr_offset] Load thread 51 // 52 void MacroAssembler::get_thread(Register thread) { 53 // can't use ExternalAddress because it can't take NULL 54 AddressLiteral null(0, relocInfo::none); 55 56 prefix(FS_segment); 57 movptr(thread, null); 58 assert(ThreadLocalStorage::get_thread_ptr_offset() != 0, 59 "Thread Pointer Offset has not been initialized"); 60 movl(thread, Address(thread, ThreadLocalStorage::get_thread_ptr_offset())); 61 } 62 #else 63 // call (Thread*)TlsGetValue(thread_index()); 64 void MacroAssembler::get_thread(Register thread) { 65 if (thread != rax) { 66 push(rax); 67 } 68 push(rdi); 69 push(rsi); 70 push(rdx); 71 push(rcx); 72 push(r8); 73 push(r9); 74 push(r10); 75 // XXX 76 mov(r10, rsp); 77 andq(rsp, -16); 78 push(r10); 79 push(r11); 80 81 movl(c_rarg0, ThreadLocalStorage::thread_index()); 82 call(RuntimeAddress((address)TlsGetValue)); 83 84 pop(r11); 85 pop(rsp); 86 pop(r10); 87 pop(r9); 88 pop(r8); 89 pop(rcx); 90 pop(rdx); 91 pop(rsi); 92 pop(rdi); 93 if (thread != rax) { 94 mov(thread, rax); 95 pop(rax); 96 } 97 } 98 #endif