stacktrace.cc revision 8852 
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 "mem/fs_translating_port_proxy.hh"
41#include "sim/system.hh"
42
43using namespace std;
44namespace X86ISA
45{
46    ProcessInfo::ProcessInfo(ThreadContext *_tc)
47        : tc(_tc)
48    {
49        Addr addr = 0;
50
51        FSTranslatingPortProxy &vp = tc->getVirtProxy();
52
53        if (!tc->getSystemPtr()->kernelSymtab->findAddress("thread_info_size", addr))
54            panic("thread info not compiled into kernel\n");
55        thread_info_size = vp.readGtoH<int32_t>(addr);
56
57        if (!tc->getSystemPtr()->kernelSymtab->findAddress("task_struct_size", addr))
58            panic("thread info not compiled into kernel\n");
59        task_struct_size = vp.readGtoH<int32_t>(addr);
60
61        if (!tc->getSystemPtr()->kernelSymtab->findAddress("thread_info_task", addr))
62            panic("thread info not compiled into kernel\n");
63        task_off = vp.readGtoH<int32_t>(addr);
64
65        if (!tc->getSystemPtr()->kernelSymtab->findAddress("task_struct_pid", addr))
66            panic("thread info not compiled into kernel\n");
67        pid_off = vp.readGtoH<int32_t>(addr);
68
69        if (!tc->getSystemPtr()->kernelSymtab->findAddress("task_struct_comm", addr))
70            panic("thread info not compiled into kernel\n");
71        name_off = vp.readGtoH<int32_t>(addr);
72    }
73
74    Addr
75    ProcessInfo::task(Addr ksp) const
76    {
77        Addr base = ksp & ~0x3fff;
78        if (base == ULL(0xfffffc0000000000))
79            return 0;
80
81        Addr tsk;
82
83        FSTranslatingPortProxy &vp = tc->getVirtProxy();
84        tsk = vp.readGtoH<Addr>(base + task_off);
85
86        return tsk;
87    }
88
89    int
90    ProcessInfo::pid(Addr ksp) const
91    {
92        Addr task = this->task(ksp);
93        if (!task)
94            return -1;
95
96        uint16_t pd;
97
98        FSTranslatingPortProxy &vp = tc->getVirtProxy();
99        pd = vp.readGtoH<uint16_t>(task + pid_off);
100
101        return pd;
102    }
103
104    string
105    ProcessInfo::name(Addr ksp) const
106    {
107        Addr task = this->task(ksp);
108        if (!task)
109            return "console";
110
111        char comm[256];
112        CopyStringOut(tc, comm, task + name_off, sizeof(comm));
113        if (!comm[0])
114            return "startup";
115
116        return comm;
117    }
118
119    StackTrace::StackTrace()
120        : tc(0), stack(64)
121    {
122    }
123
124    StackTrace::StackTrace(ThreadContext *_tc, StaticInstPtr inst)
125        : tc(0), stack(64)
126    {
127        trace(_tc, inst);
128    }
129
130    StackTrace::~StackTrace()
131    {
132    }
133
134    void
135    StackTrace::trace(ThreadContext *_tc, bool is_call)
136    {
137    }
138
139    bool
140    StackTrace::isEntry(Addr addr)
141    {
142        return false;
143    }
144
145    bool
146    StackTrace::decodeStack(MachInst inst, int &disp)
147    {
148        disp = 0;
149        return true;
150    }
151
152    bool
153    StackTrace::decodeSave(MachInst inst, int &reg, int &disp)
154    {
155        reg = 0;
156        disp = 0;
157        return true;
158    }
159
160    /*
161     * Decode the function prologue for the function we're in, and note
162     * which registers are stored where, and how large the stack frame is.
163     */
164    bool
165    StackTrace::decodePrologue(Addr sp, Addr callpc, Addr func,
166                               int &size, Addr &ra)
167    {
168        size = 0;
169        ra = 0;
170
171        for (Addr pc = func; pc < callpc; pc += sizeof(MachInst)) {
172            MachInst inst;
173            CopyOut(tc, (uint8_t *)&inst, pc, sizeof(MachInst));
174
175            int reg, disp;
176            if (decodeStack(inst, disp)) {
177                if (size) {
178                    // panic("decoding frame size again");
179                    return true;
180                }
181                size += disp;
182            } else if (decodeSave(inst, reg, disp)) {
183                if (!ra && reg == ReturnAddressReg) {
184                    CopyOut(tc, (uint8_t *)&ra, sp + disp, sizeof(Addr));
185                    if (!ra) {
186                        // panic("no return address value pc=%#x\n", pc);
187                        return false;
188                    }
189                }
190            }
191        }
192
193        return true;
194    }
195
196#if TRACING_ON
197    void
198    StackTrace::dump()
199    {
200        StringWrap name(tc->getCpuPtr()->name());
201        SymbolTable *symtab = tc->getSystemPtr()->kernelSymtab;
202
203        DPRINTFN("------ Stack ------\n");
204
205        string symbol;
206        for (int i = 0, size = stack.size(); i < size; ++i) {
207            Addr addr = stack[size - i - 1];
208            if (addr == user)
209                symbol = "user";
210            else if (addr == console)
211                symbol = "console";
212            else if (addr == unknown)
213                symbol = "unknown";
214            else
215                symtab->findSymbol(addr, symbol);
216
217            DPRINTFN("%#x: %s\n", addr, symbol);
218        }
219    }
220#endif
221}
222