1 /* 2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, Red Hat Inc. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "asm/macroAssembler.hpp" 28 #include "asm/macroAssembler.inline.hpp" 29 #include "runtime/os.hpp" 30 #include "runtime/threadLocalStorage.hpp" 31 32 33 // get_thread can be called anywhere inside generated code so we need 34 // to save whatever non-callee save context might get clobbered by the 35 // call to the C thread_local lookup call or, indeed, the call setup 36 // code. x86 appears to save C arg registers. 37 38 void MacroAssembler::get_thread(Register dst) { 39 // call pthread_getspecific 40 // void * pthread_getspecific(pthread_key_t key); 41 42 // Save all call-clobbered regs except dst, plus r19 and r20. 43 RegSet saved_regs = RegSet::range(r0, r20) + lr - dst; 44 push(saved_regs, sp); 45 mov(c_rarg0, ThreadLocalStorage::thread_index()); 46 mov(r19, CAST_FROM_FN_PTR(address, pthread_getspecific)); 47 blrt(r19, 1, 0, 1); 48 if (dst != c_rarg0) { 49 mov(dst, c_rarg0); 50 } 51 // restore pushed registers 52 pop(saved_regs, sp); 53 } 54