1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/os_cpu/linux_sparc/vm/thread_linux_sparc.cpp Thu Apr 24 15:07:57 2008 -0400
1.3 @@ -0,0 +1,107 @@
1.4 +/*
1.5 + * Copyright 2003-2004 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "incls/_precompiled.incl"
1.29 +#include "incls/_thread_linux_sparc.cpp.incl"
1.30 +
1.31 +// For Forte Analyzer AsyncGetCallTrace profiling support - thread is
1.32 +// currently interrupted by SIGPROF
1.33 +bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
1.34 + void* ucontext,
1.35 + bool isInJava) {
1.36 + assert(Thread::current() == this, "caller must be current thread");
1.37 + assert(this->is_Java_thread(), "must be JavaThread");
1.38 +
1.39 + JavaThread* jt = (JavaThread *)this;
1.40 +
1.41 + if (!isInJava) {
1.42 + // make_walkable flushes register windows and grabs last_Java_pc
1.43 + // which can not be done if the ucontext sp matches last_Java_sp
1.44 + // stack walking utilities assume last_Java_pc set if marked flushed
1.45 + jt->frame_anchor()->make_walkable(jt);
1.46 + }
1.47 +
1.48 + // If we have a walkable last_Java_frame, then we should use it
1.49 + // even if isInJava == true. It should be more reliable than
1.50 + // ucontext info.
1.51 + if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) {
1.52 + *fr_addr = jt->pd_last_frame();
1.53 + return true;
1.54 + }
1.55 +
1.56 + ucontext_t* uc = (ucontext_t*) ucontext;
1.57 +
1.58 + // At this point, we don't have a walkable last_Java_frame, so
1.59 + // we try to glean some information out of the ucontext.
1.60 + intptr_t* ret_sp;
1.61 + ExtendedPC addr =
1.62 + os::fetch_frame_from_context(uc, &ret_sp,
1.63 + NULL /* ret_fp only used on X86 */);
1.64 + if (addr.pc() == NULL || ret_sp == NULL) {
1.65 + // ucontext wasn't useful
1.66 + return false;
1.67 + }
1.68 +
1.69 + // we were running Java code when SIGPROF came in
1.70 + if (isInJava) {
1.71 + // If we have a last_Java_sp, then the SIGPROF signal caught us
1.72 + // right when we were transitioning from _thread_in_Java to a new
1.73 + // JavaThreadState. We use last_Java_sp instead of the sp from
1.74 + // the ucontext since it should be more reliable.
1.75 + if (jt->has_last_Java_frame()) {
1.76 + ret_sp = jt->last_Java_sp();
1.77 + }
1.78 + // Implied else: we don't have a last_Java_sp so we use what we
1.79 + // got from the ucontext.
1.80 +
1.81 + frame ret_frame(ret_sp, frame::unpatchable, addr.pc());
1.82 + if (!ret_frame.safe_for_sender(jt)) {
1.83 + // nothing else to try if the frame isn't good
1.84 + return false;
1.85 + }
1.86 + *fr_addr = ret_frame;
1.87 + return true;
1.88 + }
1.89 +
1.90 + // At this point, we know we weren't running Java code. We might
1.91 + // have a last_Java_sp, but we don't have a walkable frame.
1.92 + // However, we might still be able to construct something useful
1.93 + // if the thread was running native code.
1.94 + if (jt->has_last_Java_frame()) {
1.95 + assert(!jt->frame_anchor()->walkable(), "case covered above");
1.96 +
1.97 + if (jt->thread_state() == _thread_in_native) {
1.98 + frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc());
1.99 + if (!ret_frame.safe_for_sender(jt)) {
1.100 + // nothing else to try if the frame isn't good
1.101 + return false;
1.102 + }
1.103 + *fr_addr = ret_frame;
1.104 + return true;
1.105 + }
1.106 + }
1.107 +
1.108 + // nothing else to try
1.109 + return false;
1.110 +}
