thread_linux_sparc.cpp revision 133:435e64505015
10Sduke/* 23261Sohair * Copyright 2003-2004 Sun Microsystems, Inc. All Rights Reserved. 30Sduke * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 40Sduke * 50Sduke * This code is free software; you can redistribute it and/or modify it 60Sduke * under the terms of the GNU General Public License version 2 only, as 70Sduke * published by the Free Software Foundation. 80Sduke * 90Sduke * This code is distributed in the hope that it will be useful, but WITHOUT 100Sduke * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 110Sduke * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 120Sduke * version 2 for more details (a copy is included in the LICENSE file that 130Sduke * accompanied this code). 140Sduke * 150Sduke * You should have received a copy of the GNU General Public License version 160Sduke * 2 along with this work; if not, write to the Free Software Foundation, 170Sduke * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 180Sduke * 192362Sohair * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 202362Sohair * CA 95054 USA or visit www.sun.com if you need additional information or 212362Sohair * have any questions. 220Sduke * 230Sduke */ 240Sduke 250Sduke#include "incls/_precompiled.incl" 260Sduke#include "incls/_thread_linux_sparc.cpp.incl" 270Sduke 280Sduke// For Forte Analyzer AsyncGetCallTrace profiling support - thread is 290Sduke// currently interrupted by SIGPROF 300Sdukebool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, 310Sduke void* ucontext, 320Sduke bool isInJava) { 330Sduke assert(Thread::current() == this, "caller must be current thread"); 340Sduke assert(this->is_Java_thread(), "must be JavaThread"); 350Sduke 360Sduke JavaThread* jt = (JavaThread *)this; 370Sduke 380Sduke if (!isInJava) { 390Sduke // make_walkable flushes register windows and grabs last_Java_pc 400Sduke // which can not be done if the ucontext sp matches last_Java_sp 410Sduke // stack walking utilities assume last_Java_pc set if marked flushed 420Sduke jt->frame_anchor()->make_walkable(jt); 430Sduke } 440Sduke 450Sduke // If we have a walkable last_Java_frame, then we should use it 460Sduke // even if isInJava == true. It should be more reliable than 470Sduke // ucontext info. 480Sduke if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) { 490Sduke *fr_addr = jt->pd_last_frame(); 500Sduke return true; 510Sduke } 520Sduke 530Sduke ucontext_t* uc = (ucontext_t*) ucontext; 540Sduke 550Sduke // At this point, we don't have a walkable last_Java_frame, so 560Sduke // we try to glean some information out of the ucontext. 570Sduke intptr_t* ret_sp; 580Sduke ExtendedPC addr = 590Sduke os::fetch_frame_from_context(uc, &ret_sp, 600Sduke NULL /* ret_fp only used on X86 */); 610Sduke if (addr.pc() == NULL || ret_sp == NULL) { 620Sduke // ucontext wasn't useful 630Sduke return false; 640Sduke } 650Sduke 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