thread_solaris_sparc.cpp revision 4802:f2110083203d
161981Sbrian/* 261981Sbrian * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. 361981Sbrian * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 461981Sbrian * 561981Sbrian * This code is free software; you can redistribute it and/or modify it 661981Sbrian * under the terms of the GNU General Public License version 2 only, as 761981Sbrian * published by the Free Software Foundation. 861981Sbrian * 961981Sbrian * This code is distributed in the hope that it will be useful, but WITHOUT 1061981Sbrian * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1161981Sbrian * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1261981Sbrian * version 2 for more details (a copy is included in the LICENSE file that 1361981Sbrian * accompanied this code). 1461981Sbrian * 1561981Sbrian * You should have received a copy of the GNU General Public License version 1661981Sbrian * 2 along with this work; if not, write to the Free Software Foundation, 1761981Sbrian * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1861981Sbrian * 1961981Sbrian * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2061981Sbrian * or visit www.oracle.com if you need additional information or have any 2161981Sbrian * questions. 2261981Sbrian * 2361981Sbrian */ 2461981Sbrian 2565843Sbrian#include "precompiled.hpp" 2665843Sbrian#include "runtime/frame.inline.hpp" 2765843Sbrian#include "runtime/thread.inline.hpp" 2865843Sbrian 2965843Sbrian// For Forte Analyzer AsyncGetCallTrace profiling support - thread is 3065843Sbrian// currently interrupted by SIGPROF 3165843Sbrian// 3265843Sbrian// NOTE: On Solaris, register windows are flushed in the signal handler 3365843Sbrian// except for possibly the top frame. 3465843Sbrian// 3561981Sbrianbool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, 3661981Sbrian void* ucontext, bool isInJava) { 3761981Sbrian 3861981Sbrian assert(Thread::current() == this, "caller must be current thread"); 3961981Sbrian return pd_get_top_frame(fr_addr, ucontext, isInJava, true); 4061981Sbrian} 4161981Sbrian 4261981Sbrianbool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) { 4361981Sbrian // get ucontext somehow 4461981Sbrian return pd_get_top_frame(fr_addr, ucontext, isInJava, false); 4561981Sbrian} 4661981Sbrian 4761981Sbrianbool JavaThread::pd_get_top_frame(frame* fr_addr, 4861981Sbrian void* ucontext, bool isInJava, bool makeWalkable) { 4961981Sbrian assert(this->is_Java_thread(), "must be JavaThread"); 5061981Sbrian 5161981Sbrian JavaThread* jt = (JavaThread *)this; 5261981Sbrian 5361981Sbrian if (!isInJava && makeWalkable) { 5461981Sbrian // make_walkable flushes register windows and grabs last_Java_pc 5561981Sbrian // which can not be done if the ucontext sp matches last_Java_sp 5661981Sbrian // stack walking utilities assume last_Java_pc set if marked flushed 5761981Sbrian jt->frame_anchor()->make_walkable(jt); 5861981Sbrian } 5961981Sbrian 6061981Sbrian // If we have a walkable last_Java_frame, then we should use it 6161981Sbrian // even if isInJava == true. It should be more reliable than 6261981Sbrian // ucontext info. 63108959Swollman if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) { 64108959Swollman *fr_addr = jt->pd_last_frame(); 6561981Sbrian return true; 6661981Sbrian } 6761981Sbrian 6861981Sbrian ucontext_t* uc = (ucontext_t*) ucontext; 6961981Sbrian 7061981Sbrian // At this point, we don't have a walkable last_Java_frame, so 7161981Sbrian // we try to glean some information out of the ucontext. 7261981Sbrian intptr_t* ret_sp; 7374314Sbrian ExtendedPC addr = os::Solaris::fetch_frame_from_ucontext(this, uc, 7461981Sbrian &ret_sp, NULL /* ret_fp only used on Solaris X86 */); 7561981Sbrian if (addr.pc() == NULL || ret_sp == NULL) { 7661981Sbrian // ucontext wasn't useful 7761981Sbrian return false; 7861981Sbrian } 7961981Sbrian 8062054Sbrian frame ret_frame(ret_sp, frame::unpatchable, addr.pc()); 8177496Sbrian 8277492Sbrian // we were running Java code when SIGPROF came in 8361981Sbrian if (isInJava) { 8461981Sbrian 8561981Sbrian 8661981Sbrian // If the frame we got is safe then it is most certainly valid 8761981Sbrian if (ret_frame.safe_for_sender(jt)) { 8861981Sbrian *fr_addr = ret_frame; 8961981Sbrian return true; 9061981Sbrian } 9161981Sbrian 9262644Ssheldonh // If it isn't safe then we can try several things to try and get 9361981Sbrian // a good starting point. 9461981Sbrian // 9561981Sbrian // On sparc the frames are almost certainly walkable in the sense 9661981Sbrian // of sp/fp linkages. However because of recycling of windows if 9761981Sbrian // a piece of code does multiple save's where the initial save creates 9861981Sbrian // a real frame with a return pc and the succeeding save's are used to 9961981Sbrian // simply get free registers and have no real pc then the pc linkage on these 10061981Sbrian // "inner" temporary frames will be bogus. 10161981Sbrian // Since there is in general only a nesting level like 10261981Sbrian // this one deep in general we'll try and unwind such an "inner" frame 10361981Sbrian // here ourselves and see if it makes sense 10494342Sgshapiro 10561981Sbrian frame unwind_frame(ret_frame.fp(), frame::unpatchable, addr.pc()); 10661981Sbrian 10761981Sbrian if (unwind_frame.safe_for_sender(jt)) { 10887514Scjc *fr_addr = unwind_frame; 10961981Sbrian return true; 11061981Sbrian } 11161981Sbrian 11262274Sbrian // Well that didn't work. Most likely we're toast on this tick 11361981Sbrian // The previous code would try this. I think it is dubious in light 11475809Sdirk // of changes to safe_for_sender and the unwind trick above but 11575809Sdirk // if it gets us a safe frame who wants to argue. 11675809Sdirk 11775809Sdirk // If we have a last_Java_sp, then the SIGPROF signal caught us 11872677Speter // right when we were transitioning from _thread_in_Java to a new 11972677Speter // JavaThreadState. We use last_Java_sp instead of the sp from 12094342Sgshapiro // the ucontext since it should be more reliable. 12172677Speter 12261981Sbrian if (jt->has_last_Java_frame()) { 12361981Sbrian ret_sp = jt->last_Java_sp(); 12461981Sbrian frame ret_frame2(ret_sp, frame::unpatchable, addr.pc()); 12561981Sbrian if (ret_frame2.safe_for_sender(jt)) { 12687514Scjc *fr_addr = ret_frame2; 12787514Scjc return true; 128101607Sfanf } 12987514Scjc } 13087514Scjc 13187514Scjc // This is the best we can do. We will only be able to decode the top frame 13287514Scjc 13387514Scjc *fr_addr = ret_frame; 13487514Scjc return true; 13587514Scjc } 13687514Scjc 13787514Scjc // At this point, we know we weren't running Java code. We might 13887514Scjc // have a last_Java_sp, but we don't have a walkable frame. 13987514Scjc // However, we might still be able to construct something useful 14087514Scjc // if the thread was running native code. 14187514Scjc if (jt->has_last_Java_frame()) { 14287514Scjc assert(!jt->frame_anchor()->walkable(), "case covered above"); 14387514Scjc 14487514Scjc frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc()); 14587514Scjc *fr_addr = ret_frame; 14687514Scjc return true; 14787514Scjc } 14887514Scjc 14987514Scjc // nothing else to try but what we found initially 15087514Scjc 15187514Scjc *fr_addr = ret_frame; 152105937Sthomas return true; 153105937Sthomas} 154105937Sthomas 15587514Scjcvoid JavaThread::cache_global_variables() { } 15687514Scjc 15787514Scjc