1 /*
2 * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016, 2019 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "runtime/frame.inline.hpp"
28 #include "runtime/thread.hpp"
29
pd_last_frame()30 frame JavaThread::pd_last_frame() {
31 assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
32
33 intptr_t* sp = last_Java_sp();
34 address pc = _anchor.last_Java_pc();
35
36 // Last_Java_pc ist not set if we come here from compiled code.
37 if (pc == NULL) {
38 pc = (address) *(sp + 14);
39 }
40
41 return frame(sp, pc);
42 }
43
pd_get_top_frame_for_profiling(frame * fr_addr,void * ucontext,bool isInJava)44 bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
45 assert(this->is_Java_thread(), "must be JavaThread");
46
47 // If we have a last_Java_frame, then we should use it even if
48 // isInJava == true. It should be more reliable than ucontext info.
49 if (has_last_Java_frame() && frame_anchor()->walkable()) {
50 *fr_addr = pd_last_frame();
51 return true;
52 }
53
54 if (isInJava) {
55 ucontext_t* uc = (ucontext_t*) ucontext;
56 frame ret_frame((intptr_t*)uc->uc_mcontext.gregs[15/*Z_SP*/],
57 (address)uc->uc_mcontext.psw.addr);
58
59 if (ret_frame.pc() == NULL) {
60 // ucontext wasn't useful
61 return false;
62 }
63
64 if (ret_frame.is_interpreted_frame()) {
65 frame::z_ijava_state* istate = ret_frame.ijava_state_unchecked();
66 if (stack_base() >= (address)istate && (address)istate > stack_end()) {
67 return false;
68 }
69 const Method *m = (const Method*)(istate->method);
70 if (!Method::is_valid_method(m)) return false;
71 if (!Metaspace::contains((const void*)m->constMethod())) return false;
72
73 uint64_t reg_bcp = uc->uc_mcontext.gregs[13/*Z_BCP*/];
74 uint64_t istate_bcp = istate->bcp;
75 uint64_t code_start = (uint64_t)(m->code_base());
76 uint64_t code_end = (uint64_t)(m->code_base() + m->code_size());
77 if (istate_bcp >= code_start && istate_bcp < code_end) {
78 // we have a valid bcp, don't touch it, do nothing
79 } else if (reg_bcp >= code_start && reg_bcp < code_end) {
80 istate->bcp = reg_bcp;
81 } else {
82 return false;
83 }
84 }
85 if (!ret_frame.safe_for_sender(this)) {
86 // nothing else to try if the frame isn't good
87 return false;
88 }
89 *fr_addr = ret_frame;
90 return true;
91 }
92 // nothing else to try
93 return false;
94 }
95
96 // Forte Analyzer AsyncGetCallTrace profiling support.
pd_get_top_frame_for_signal_handler(frame * fr_addr,void * ucontext,bool isInJava)97 bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext, bool isInJava) {
98 return pd_get_top_frame_for_profiling(fr_addr, ucontext, isInJava);
99 }
100
cache_global_variables()101 void JavaThread::cache_global_variables() { }
102