thread_linux_sparc.cpp revision 3864:f34d701e952e 
1/*
2 * Copyright (c) 2003, 2010, 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 "precompiled.hpp"
26#include "runtime/frame.inline.hpp"
27#include "runtime/thread.inline.hpp"
28
29// For Forte Analyzer AsyncGetCallTrace profiling support - thread is
30// currently interrupted by SIGPROF
31bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr,
32                                                     void* ucontext,
33                                                     bool isInJava) {
34  assert(Thread::current() == this, "caller must be current thread");
35  assert(this->is_Java_thread(), "must be JavaThread");
36
37  JavaThread* jt = (JavaThread *)this;
38
39  if (!isInJava) {
40    // make_walkable flushes register windows and grabs last_Java_pc
41    // which can not be done if the ucontext sp matches last_Java_sp
42    // stack walking utilities assume last_Java_pc set if marked flushed
43    jt->frame_anchor()->make_walkable(jt);
44  }
45
46  // If we have a walkable last_Java_frame, then we should use it
47  // even if isInJava == true. It should be more reliable than
48  // ucontext info.
49  if (jt->has_last_Java_frame() && jt->frame_anchor()->walkable()) {
50    *fr_addr = jt->pd_last_frame();
51    return true;
52  }
53
54  ucontext_t* uc = (ucontext_t*) ucontext;
55
56  // At this point, we don't have a walkable last_Java_frame, so
57  // we try to glean some information out of the ucontext.
58  intptr_t* ret_sp;
59  ExtendedPC addr =
60    os::fetch_frame_from_context(uc, &ret_sp,
61                                 NULL /* ret_fp only used on X86 */);
62  if (addr.pc() == NULL || ret_sp == NULL) {
63    // ucontext wasn't useful
64    return false;
65  }
66
67  // we were running Java code when SIGPROF came in
68  if (isInJava) {
69    // If we have a last_Java_sp, then the SIGPROF signal caught us
70    // right when we were transitioning from _thread_in_Java to a new
71    // JavaThreadState. We use last_Java_sp instead of the sp from
72    // the ucontext since it should be more reliable.
73    if (jt->has_last_Java_frame()) {
74      ret_sp = jt->last_Java_sp();
75    }
76    // Implied else: we don't have a last_Java_sp so we use what we
77    // got from the ucontext.
78
79    frame ret_frame(ret_sp, frame::unpatchable, addr.pc());
80    if (!ret_frame.safe_for_sender(jt)) {
81      // nothing else to try if the frame isn't good
82      return false;
83    }
84    *fr_addr = ret_frame;
85    return true;
86  }
87
88  // At this point, we know we weren't running Java code. We might
89  // have a last_Java_sp, but we don't have a walkable frame.
90  // However, we might still be able to construct something useful
91  // if the thread was running native code.
92  if (jt->has_last_Java_frame()) {
93    assert(!jt->frame_anchor()->walkable(), "case covered above");
94
95    if (jt->thread_state() == _thread_in_native) {
96      frame ret_frame(jt->last_Java_sp(), frame::unpatchable, addr.pc());
97      if (!ret_frame.safe_for_sender(jt)) {
98        // nothing else to try if the frame isn't good
99        return false;
100      }
101      *fr_addr = ret_frame;
102      return true;
103    }
104  }
105
106  // nothing else to try
107  return false;
108}
109
110void JavaThread::cache_global_variables() { }
111
112