1 /*
2 * Copyright (c) 2003, 2019, 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 package sun.jvm.hotspot.debugger.linux.amd64;
26
27 import sun.jvm.hotspot.debugger.*;
28 import sun.jvm.hotspot.debugger.amd64.*;
29 import sun.jvm.hotspot.debugger.linux.*;
30 import sun.jvm.hotspot.debugger.cdbg.*;
31 import sun.jvm.hotspot.debugger.cdbg.basic.*;
32
33 final public class LinuxAMD64CFrame extends BasicCFrame {
34 public LinuxAMD64CFrame(LinuxDebugger dbg, Address cfa, Address rip, DwarfParser dwarf) {
35 super(dbg.getCDebugger());
36 this.cfa = cfa;
37 this.rip = rip;
38 this.dbg = dbg;
39 this.dwarf = dwarf;
40 }
41
42 // override base class impl to avoid ELF parsing
43 public ClosestSymbol closestSymbolToPC() {
44 // try native lookup in debugger.
45 return dbg.lookup(dbg.getAddressValue(pc()));
46 }
47
48 public Address pc() {
49 return rip;
50 }
51
52 public Address localVariableBase() {
53 return cfa;
54 }
55
56 private boolean isValidFrame(Address nextCFA, ThreadProxy thread) {
57 return (nextCFA != null) &&
58 !nextCFA.addOffsetTo(1 * 1024 * 1024 * 1024).lessThan(cfa) && // FIXME: assume to 1GB diff
59 !nextCFA.lessThan(thread.getContext().getRegisterAsAddress(AMD64ThreadContext.RSP));
60 }
61
62 private CFrame javaSender(ThreadProxy thread) {
63 Address nextCFA;
64 Address nextPC;
65 try { // FIXME: cannot read RBP from CFA in some case
66 nextCFA = cfa.getAddressAt(0);
67 // FIXME: assume to 1GB diff of stack
68 if (!isValidFrame(nextCFA, thread)) {
69 return null;
70 }
71
72 nextPC = nextCFA.getAddressAt( 1 * ADDRESS_SIZE);
73 if (nextPC == null) {
74 return null;
75 }
76 } catch (UnmappedAddressException | UnalignedAddressException e) {
77 return null;
78 }
79
80 DwarfParser nextDwarf = null;
81 long libptr = dbg.findLibPtrByAddress(nextPC);
82 if (libptr != 0L) { // Native frame
83 try {
84 nextDwarf = new DwarfParser(libptr);
85 } catch (DebuggerException e) {
86 return new LinuxAMD64CFrame(dbg, nextCFA, nextPC, null);
87 }
88 nextDwarf.processDwarf(nextPC);
89 nextCFA = nextCFA.addOffsetTo(- nextDwarf.getBasePointerOffsetFromCFA());
90 if (!isValidFrame(nextCFA, thread)) {
91 return null;
92 }
93 }
94
95 return new LinuxAMD64CFrame(dbg, nextCFA, nextPC, nextDwarf);
96 }
97
98 public CFrame sender(ThreadProxy thread) {
99 if (dwarf == null) { // Java frame
100 return javaSender(thread);
101 }
102
103 Address nextPC;
104 Address nextCFA;
105 try { // FIXME: cannot read RBP from CFA in some case
106 nextPC = cfa.getAddressAt(dwarf.getReturnAddressOffsetFromCFA());
107 if (nextPC == null) {
108 return null;
109 }
110
111 nextCFA = cfa.getAddressAt(dwarf.getBasePointerOffsetFromCFA());
112 if (!isValidFrame(nextCFA, thread)) {
113 return null;
114 }
115 } catch (UnmappedAddressException | UnalignedAddressException e) {
116 return null;
117 }
118
119 DwarfParser nextDwarf = dwarf;
120 if (!dwarf.isIn(nextPC)) {
121 long libptr = dbg.findLibPtrByAddress(nextPC);
122 if (libptr == 0L) {
123 // Next frame might be Java frame
124 return new LinuxAMD64CFrame(dbg, nextCFA, nextPC, null);
125 }
126 try {
127 nextDwarf = new DwarfParser(libptr);
128 } catch (DebuggerException e) {
129 nextCFA = cfa.getAddressAt(0);
130 return isValidFrame(nextCFA, thread) ? new LinuxAMD64CFrame(dbg, nextCFA, nextPC, null)
131 : null;
132 }
133 }
134
135 nextDwarf.processDwarf(nextPC);
136
137 int nextCFAReg = nextDwarf.getCFARegister();
138 if (!dwarf.isBPOffsetAvailable() &&
139 (nextCFAReg == AMD64ThreadContext.RBP) &&
140 (nextCFAReg != dwarf.getCFARegister())) {
141 nextCFA = thread.getContext()
142 .getRegisterAsAddress(AMD64ThreadContext.RBP);
143 if (!isValidFrame(nextCFA, thread)) {
144 return null;
145 }
146 }
147
148 nextCFA = nextCFA.addOffsetTo(- nextDwarf.getBasePointerOffsetFromCFA());
149 return isValidFrame(nextCFA, thread) ? new LinuxAMD64CFrame(dbg, nextCFA, nextPC, nextDwarf)
150 : null;
151 }
152
153 // package/class internals only
154 private static final int ADDRESS_SIZE = 8;
155 private Address rip;
156 private Address cfa;
157 private LinuxDebugger dbg;
158 private DwarfParser dwarf;
159 }