1 /* 2 * Copyright (c) 2003, 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/_thread_linux_sparc.cpp.incl" 27 28 // For Forte Analyzer AsyncGetCallTrace profiling support - thread is 29 // currently interrupted by SIGPROF 30 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, 31 void* ucontext, 32 bool isInJava) { 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 (!isInJava) { 39 // make_walkable flushes register windows and grabs last_Java_pc 40 // which can not be done if the ucontext sp matches last_Java_sp 41 // stack walking utilities assume last_Java_pc set if marked flushed 42 jt->frame_anchor()->make_walkable(jt); 43 } 44 45 // If we have a walkable last_Java_frame, then we should use it 46 // even if isInJava == true. It should be more reliable than 47 // ucontext info. 48 if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) { 49 *fr_addr = jt->pd_last_frame(); 50 return true; 51 } 52 53 ucontext_t* uc = (ucontext_t*) ucontext; 54 55 // At this point, we don't have a walkable last_Java_frame, so 56 // we try to glean some information out of the ucontext. 57 intptr_t* ret_sp; 58 ExtendedPC addr = 59 os::fetch_frame_from_context(uc, &ret_sp, 60 NULL /* ret_fp only used on X86 */); 61 if (addr.pc() == NULL || ret_sp == NULL) { 62 // ucontext wasn't useful 63 return false; 64 } 65 66 // we were running Java code when SIGPROF came in 67 if (isInJava) { 68 // If we have a last_Java_sp, then the SIGPROF signal caught us 69 // right when we were transitioning from _thread_in_Java to a new 70 // JavaThreadState. We use last_Java_sp instead of the sp from 71 // the ucontext since it should be more reliable. 72 if (jt->has_last_Java_frame()) { 73 ret_sp = jt->last_Java_sp(); 74 } 75 // Implied else: we don't have a last_Java_sp so we use what we 76 // got from the ucontext. 77 78 frame ret_frame(ret_sp, frame::unpatchable, addr.pc()); 79 if (!ret_frame.safe_for_sender(jt)) { 80 // nothing else to try if the frame isn't good 81 return false; 82 } 83 *fr_addr = ret_frame; 84 return true; 85 } 86 87 // At this point, we know we weren't running Java code. We might 88 // have a last_Java_sp, but we don't have a walkable frame. 89 // However, we might still be able to construct something useful 90 // if the thread was running native code. 91 if (jt->has_last_Java_frame()) { 92 assert(!jt->frame_anchor()->walkable(), "case covered above"); 93 94 if (jt->thread_state() == _thread_in_native) { 95 frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc()); 96 if (!ret_frame.safe_for_sender(jt)) { 97 // nothing else to try if the frame isn't good 98 return false; 99 } 100 *fr_addr = ret_frame; 101 return true; 102 } 103 } 104 105 // nothing else to try 106 return false; 107 } 108 109 void JavaThread::cache_global_variables() { } 110