1 /* 2 * Copyright (c) 2003, 2010, 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 "precompiled.hpp" 26 #include "runtime/frame.inline.hpp" 27 #include "thread_linux.inline.hpp" 28 29 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is 30 // currently interrupted by SIGPROF 31 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, 32 void* ucontext, bool isInJava) { 33 34 assert(Thread::current() == this, "caller must be current thread"); 35 assert(this->is_Java_thread(), "must be JavaThread"); 36 37 JavaThread* jt = (JavaThread *)this; 38 39 // If we have a last_Java_frame, then we should use it even if 40 // isInJava == true. It should be more reliable than ucontext info. 41 if (jt->has_last_Java_frame()) { 42 *fr_addr = jt->pd_last_frame(); 43 return true; 44 } 45 46 // At this point, we don't have a last_Java_frame, so 47 // we try to glean some information out of the ucontext 48 // if we were running Java code when SIGPROF came in. 49 if (isInJava) { 50 ucontext_t* uc = (ucontext_t*) ucontext; 51 52 intptr_t* ret_fp; 53 intptr_t* ret_sp; 54 ExtendedPC addr = os::Linux::fetch_frame_from_ucontext(this, uc, 55 &ret_sp, &ret_fp); 56 if (addr.pc() == NULL || ret_sp == NULL ) { 57 // ucontext wasn't useful 58 return false; 59 } 60 61 frame ret_frame(ret_sp, ret_fp, addr.pc()); 62 if (!ret_frame.safe_for_sender(jt)) { 63 #ifdef COMPILER2 64 // C2 uses ebp as a general register see if NULL fp helps 65 frame ret_frame2(ret_sp, NULL, addr.pc()); 66 if (!ret_frame2.safe_for_sender(jt)) { 67 // nothing else to try if the frame isn't good 68 return false; 69 } 70 ret_frame = ret_frame2; 71 #else 72 // nothing else to try if the frame isn't good 73 return false; 74 #endif /* COMPILER2 */ 75 } 76 *fr_addr = ret_frame; 77 return true; 78 } 79 80 // nothing else to try 81 return false; 82 } 83 84 void JavaThread::cache_global_variables() { } 85