thread_solaris_sparc.cpp revision 0
0N/A/*
0N/A * Copyright 2003-2004 Sun Microsystems, Inc. All Rights Reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
0N/A * published by the Free Software Foundation.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
0N/A * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
0N/A * CA 95054 USA or visit www.sun.com if you need additional information or
0N/A * have any questions.
0N/A *
0N/A */
0N/A
0N/A#include "incls/_precompiled.incl"
0N/A#include "incls/_thread_solaris_sparc.cpp.incl"
0N/A
0N/A// For Forte Analyzer AsyncGetCallTrace profiling support - thread is
0N/A// currently interrupted by SIGPROF
0N/A//
0N/A// NOTE: On Solaris, register windows are flushed in the signal handler
0N/A// except for possibly the top frame.
0N/A//
0N/Abool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
0N/A void* ucontext, bool isInJava) {
0N/A
0N/A assert(Thread::current() == this, "caller must be current thread");
0N/A assert(this->is_Java_thread(), "must be JavaThread");
0N/A
0N/A JavaThread* jt = (JavaThread *)this;
0N/A
0N/A if (!isInJava) {
0N/A // make_walkable flushes register windows and grabs last_Java_pc
0N/A // which can not be done if the ucontext sp matches last_Java_sp
0N/A // stack walking utilities assume last_Java_pc set if marked flushed
0N/A jt->frame_anchor()->make_walkable(jt);
0N/A }
0N/A
0N/A // If we have a walkable last_Java_frame, then we should use it
0N/A // even if isInJava == true. It should be more reliable than
0N/A // ucontext info.
0N/A if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) {
0N/A#if 0
0N/A // This sanity check may not be needed with the new frame
0N/A // walking code. Remove it for now.
0N/A if (!jt->frame_anchor()->post_Java_state_is_pc()
0N/A && frame::next_younger_sp_or_null(last_Java_sp(),
0N/A jt->frame_anchor()->post_Java_sp()) == NULL) {
0N/A // the anchor contains an SP, but the frame is not walkable
0N/A // because post_Java_sp isn't valid relative to last_Java_sp
0N/A return false;
0N/A }
0N/A#endif
0N/A *fr_addr = jt->pd_last_frame();
0N/A return true;
0N/A }
0N/A
0N/A ucontext_t* uc = (ucontext_t*) ucontext;
0N/A
0N/A // At this point, we don't have a walkable last_Java_frame, so
0N/A // we try to glean some information out of the ucontext.
0N/A intptr_t* ret_sp;
0N/A ExtendedPC addr = os::Solaris::fetch_frame_from_ucontext(this, uc,
0N/A &ret_sp, NULL /* ret_fp only used on Solaris X86 */);
0N/A if (addr.pc() == NULL || ret_sp == NULL) {
0N/A // ucontext wasn't useful
0N/A return false;
0N/A }
0N/A
0N/A // we were running Java code when SIGPROF came in
0N/A if (isInJava) {
0N/A // If we have a last_Java_sp, then the SIGPROF signal caught us
0N/A // right when we were transitioning from _thread_in_Java to a new
0N/A // JavaThreadState. We use last_Java_sp instead of the sp from
0N/A // the ucontext since it should be more reliable.
0N/A if (jt->has_last_Java_frame()) {
0N/A ret_sp = jt->last_Java_sp();
0N/A }
0N/A // Implied else: we don't have a last_Java_sp so we use what we
0N/A // got from the ucontext.
0N/A
0N/A frame ret_frame(ret_sp, frame::unpatchable, addr.pc());
0N/A if (!ret_frame.safe_for_sender(jt)) {
0N/A // nothing else to try if the frame isn't good
0N/A return false;
0N/A }
0N/A *fr_addr = ret_frame;
0N/A return true;
0N/A }
0N/A
0N/A // At this point, we know we weren't running Java code. We might
0N/A // have a last_Java_sp, but we don't have a walkable frame.
0N/A // However, we might still be able to construct something useful
0N/A // if the thread was running native code.
0N/A if (jt->has_last_Java_frame()) {
0N/A assert(!jt->frame_anchor()->walkable(), "case covered above");
0N/A
0N/A if (jt->thread_state() == _thread_in_native) {
0N/A frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc());
0N/A if (!ret_frame.safe_for_sender(jt)) {
0N/A // nothing else to try if the frame isn't good
0N/A return false;
0N/A }
0N/A *fr_addr = ret_frame;
0N/A return true;
0N/A }
0N/A }
0N/A
0N/A // nothing else to try
0N/A return false;
0N/A}