thread_linux_x86.cpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 2003, 2005, 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/_thread_linux_x86.cpp.incl" 27 28// For Forte Analyzer AsyncGetCallTrace profiling support - thread is 29// currently interrupted by SIGPROF 30bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, 31 void* ucontext, bool isInJava) { 32 33 assert(Thread::current() == this, "caller must be current thread"); 34 assert(this->is_Java_thread(), "must be JavaThread"); 35 36 JavaThread* jt = (JavaThread *)this; 37 38 // If we have a last_Java_frame, then we should use it even if 39 // isInJava == true. It should be more reliable than ucontext info. 40 if (jt->has_last_Java_frame()) { 41 *fr_addr = jt->pd_last_frame(); 42 return true; 43 } 44 45 // At this point, we don't have a last_Java_frame, so 46 // we try to glean some information out of the ucontext 47 // if we were running Java code when SIGPROF came in. 48 if (isInJava) { 49 ucontext_t* uc = (ucontext_t*) ucontext; 50 51 intptr_t* ret_fp; 52 intptr_t* ret_sp; 53 ExtendedPC addr = os::Linux::fetch_frame_from_ucontext(this, uc, 54 &ret_sp, &ret_fp); 55 if (addr.pc() == NULL || ret_sp == NULL ) { 56 // ucontext wasn't useful 57 return false; 58 } 59 60 frame ret_frame(ret_sp, ret_fp, addr.pc()); 61 if (!ret_frame.safe_for_sender(jt)) { 62#ifdef COMPILER2 63 // C2 uses ebp as a general register see if NULL fp helps 64 frame ret_frame2(ret_sp, NULL, addr.pc()); 65 if (!ret_frame2.safe_for_sender(jt)) { 66 // nothing else to try if the frame isn't good 67 return false; 68 } 69 ret_frame = ret_frame2; 70#else 71 // nothing else to try if the frame isn't good 72 return false; 73#endif /* COMPILER2 */ 74 } 75 *fr_addr = ret_frame; 76 return true; 77 } 78 79 // nothing else to try 80 return false; 81} 82