1 /* 2 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, Red Hat Inc. All rights reserved. 4 * Copyright (c) 2015, Linaro Ltd. All rights reserved. 5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 6 * 7 * This code is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License version 2 only, as 9 * published by the Free Software Foundation. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 * 25 */ 26 27 #ifndef CPU_AARCH32_VM_JAVAFRAMEANCHOR_AARCH32_HPP 28 #define CPU_AARCH32_VM_JAVAFRAMEANCHOR_AARCH32_HPP 29 30 private: 31 32 // FP value associated with _last_Java_sp: 33 intptr_t* volatile _last_Java_fp; // pointer is volatile not what it points to 34 35 public: 36 // Each arch must define reset, save, restore 37 // These are used by objects that only care about: 38 // 1 - initializing a new state (thread creation, javaCalls) 39 // 2 - saving a current state (javaCalls) 40 // 3 - restoring an old state (javaCalls) 41 42 void clear(void) { 43 // clearing _last_Java_sp must be first 44 _last_Java_sp = NULL; 45 OrderAccess::release(); 46 _last_Java_fp = NULL; 47 _last_Java_pc = NULL; 48 } 49 50 void copy(JavaFrameAnchor* src) { 51 // In order to make sure the transition state is valid for "this" 52 // We must clear _last_Java_sp before copying the rest of the new data 53 // 54 // Hack Alert: Temporary bugfix for 4717480/4721647 55 // To act like previous version (pd_cache_state) don't NULL _last_Java_sp 56 // unless the value is changing 57 // 58 if (_last_Java_sp != src->_last_Java_sp) { 59 _last_Java_sp = NULL; 60 OrderAccess::release(); 61 } 62 _last_Java_fp = src->_last_Java_fp; 63 _last_Java_pc = src->_last_Java_pc; 64 // Must be last so profiler will always see valid frame if has_last_frame() is true 65 _last_Java_sp = src->_last_Java_sp; 66 } 67 68 bool walkable(void) { return _last_Java_sp != NULL && _last_Java_pc != NULL; } 69 void make_walkable(JavaThread* thread); 70 void capture_last_Java_pc(void); 71 72 intptr_t* last_Java_sp(void) const { return _last_Java_sp; } 73 74 address last_Java_pc(void) { return _last_Java_pc; } 75 76 private: 77 78 static ByteSize last_Java_fp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_fp); } 79 80 public: 81 82 void set_last_Java_sp(intptr_t* sp) { _last_Java_sp = sp; OrderAccess::release(); } 83 84 intptr_t* last_Java_fp(void) { return _last_Java_fp; } 85 // Assert (last_Java_sp == NULL || fp == NULL) 86 void set_last_Java_fp(intptr_t* fp) { OrderAccess::release(); _last_Java_fp = fp; } 87 88 #endif // CPU_AARCH32_VM_JAVAFRAMEANCHOR_AARCH32_HPP