1/*
2 * Copyright (c) 2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Nathan Binkert
29 */
30
31#include <string>
32
33#include "arch/x86/isa_traits.hh"
34#include "arch/x86/stacktrace.hh"
35#include "arch/x86/vtophys.hh"
36#include "base/bitfield.hh"
37#include "base/trace.hh"
38#include "cpu/base.hh"
39#include "cpu/thread_context.hh"
40#include "sim/system.hh"
41
42using namespace std;
43namespace X86ISA
44{
45 ProcessInfo::ProcessInfo(ThreadContext *_tc)
46 : tc(_tc)
47 {
48 Addr addr = 0;
49
50 VirtualPort *vp;
51
52 vp = tc->getVirtPort();
53
54 if (!tc->getSystemPtr()->kernelSymtab->findAddress("thread_info_size", addr))
55 panic("thread info not compiled into kernel\n");
56 thread_info_size = vp->readGtoH<int32_t>(addr);
57
58 if (!tc->getSystemPtr()->kernelSymtab->findAddress("task_struct_size", addr))
59 panic("thread info not compiled into kernel\n");
60 task_struct_size = vp->readGtoH<int32_t>(addr);
61
62 if (!tc->getSystemPtr()->kernelSymtab->findAddress("thread_info_task", addr))
63 panic("thread info not compiled into kernel\n");
64 task_off = vp->readGtoH<int32_t>(addr);
65
66 if (!tc->getSystemPtr()->kernelSymtab->findAddress("task_struct_pid", addr))
67 panic("thread info not compiled into kernel\n");
68 pid_off = vp->readGtoH<int32_t>(addr);
69
70 if (!tc->getSystemPtr()->kernelSymtab->findAddress("task_struct_comm", addr))
71 panic("thread info not compiled into kernel\n");
72 name_off = vp->readGtoH<int32_t>(addr);
73 }
74
75 Addr
76 ProcessInfo::task(Addr ksp) const
77 {
78 Addr base = ksp & ~0x3fff;
79 if (base == ULL(0xfffffc0000000000))
80 return 0;
81
82 Addr tsk;
83
84 VirtualPort *vp;
85
86 vp = tc->getVirtPort();
87 tsk = vp->readGtoH<Addr>(base + task_off);
88
89 return tsk;
90 }
91
92 int
93 ProcessInfo::pid(Addr ksp) const
94 {
95 Addr task = this->task(ksp);
96 if (!task)
97 return -1;
98
99 uint16_t pd;
100
101 VirtualPort *vp;
102
103 vp = tc->getVirtPort();
104 pd = vp->readGtoH<uint16_t>(task + pid_off);
105
106 return pd;
107 }
108
109 string
110 ProcessInfo::name(Addr ksp) const
111 {
112 Addr task = this->task(ksp);
113 if (!task)
114 return "console";
115
116 char comm[256];
117 CopyStringOut(tc, comm, task + name_off, sizeof(comm));
118 if (!comm[0])
119 return "startup";
120
121 return comm;
122 }
123
124 StackTrace::StackTrace()
125 : tc(0), stack(64)
126 {
127 }
128
129 StackTrace::StackTrace(ThreadContext *_tc, StaticInstPtr inst)
130 : tc(0), stack(64)
131 {
132 trace(_tc, inst);
133 }
134
135 StackTrace::~StackTrace()
136 {
137 }
138
139 void
140 StackTrace::trace(ThreadContext *_tc, bool is_call)
141 {
142 }
143
144 bool
145 StackTrace::isEntry(Addr addr)
146 {
147 return false;
148 }
149
150 bool
151 StackTrace::decodeStack(MachInst inst, int &disp)
152 {
153 disp = 0;
154 return true;
155 }
156
157 bool
158 StackTrace::decodeSave(MachInst inst, int &reg, int &disp)
159 {
160 reg = 0;
161 disp = 0;
162 return true;
163 }
164
165 /*
166 * Decode the function prologue for the function we're in, and note
167 * which registers are stored where, and how large the stack frame is.
168 */
169 bool
170 StackTrace::decodePrologue(Addr sp, Addr callpc, Addr func,
171 int &size, Addr &ra)
172 {
173 size = 0;
174 ra = 0;
175
176 for (Addr pc = func; pc < callpc; pc += sizeof(MachInst)) {
177 MachInst inst;
178 CopyOut(tc, (uint8_t *)&inst, pc, sizeof(MachInst));
179
180 int reg, disp;
181 if (decodeStack(inst, disp)) {
182 if (size) {
183 // panic("decoding frame size again");
184 return true;
185 }
186 size += disp;
187 } else if (decodeSave(inst, reg, disp)) {
188 if (!ra && reg == ReturnAddressReg) {
189 CopyOut(tc, (uint8_t *)&ra, sp + disp, sizeof(Addr));
190 if (!ra) {
191 // panic("no return address value pc=%#x\n", pc);
192 return false;
193 }
194 }
195 }
196 }
197
198 return true;
199 }
200
201#if TRACING_ON
202 void
203 StackTrace::dump()
204 {
205 StringWrap name(tc->getCpuPtr()->name());
206 SymbolTable *symtab = tc->getSystemPtr()->kernelSymtab;
207
208 DPRINTFN("------ Stack ------\n");
209
210 string symbol;
211 for (int i = 0, size = stack.size(); i < size; ++i) {
212 Addr addr = stack[size - i - 1];
213 if (addr == user)
214 symbol = "user";
215 else if (addr == console)
216 symbol = "console";
217 else if (addr == unknown)
218 symbol = "unknown";
219 else
220 symtab->findSymbol(addr, symbol);
221
222 DPRINTFN("%#x: %s\n", addr, symbol);
223 }
224 }
225#endif
226}