stacktrace.cc revision 8706 
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;
52
53        vp = tc->getVirtProxy();
54
55        if (!tc->getSystemPtr()->kernelSymtab->findAddress("thread_info_size", addr))
56            panic("thread info not compiled into kernel\n");
57        thread_info_size = vp->readGtoH<int32_t>(addr);
58
59        if (!tc->getSystemPtr()->kernelSymtab->findAddress("task_struct_size", addr))
60            panic("thread info not compiled into kernel\n");
61        task_struct_size = vp->readGtoH<int32_t>(addr);
62
63        if (!tc->getSystemPtr()->kernelSymtab->findAddress("thread_info_task", addr))
64            panic("thread info not compiled into kernel\n");
65        task_off = vp->readGtoH<int32_t>(addr);
66
67        if (!tc->getSystemPtr()->kernelSymtab->findAddress("task_struct_pid", addr))
68            panic("thread info not compiled into kernel\n");
69        pid_off = vp->readGtoH<int32_t>(addr);
70
71        if (!tc->getSystemPtr()->kernelSymtab->findAddress("task_struct_comm", addr))
72            panic("thread info not compiled into kernel\n");
73        name_off = vp->readGtoH<int32_t>(addr);
74    }
75
76    Addr
77    ProcessInfo::task(Addr ksp) const
78    {
79        Addr base = ksp & ~0x3fff;
80        if (base == ULL(0xfffffc0000000000))
81            return 0;
82
83        Addr tsk;
84
85        FSTranslatingPortProxy* vp;
86
87        vp = tc->getVirtProxy();
88        tsk = vp->readGtoH<Addr>(base + task_off);
89
90        return tsk;
91    }
92
93    int
94    ProcessInfo::pid(Addr ksp) const
95    {
96        Addr task = this->task(ksp);
97        if (!task)
98            return -1;
99
100        uint16_t pd;
101
102        FSTranslatingPortProxy* vp;
103
104        vp = tc->getVirtProxy();
105        pd = vp->readGtoH<uint16_t>(task + pid_off);
106
107        return pd;
108    }
109
110    string
111    ProcessInfo::name(Addr ksp) const
112    {
113        Addr task = this->task(ksp);
114        if (!task)
115            return "console";
116
117        char comm[256];
118        CopyStringOut(tc, comm, task + name_off, sizeof(comm));
119        if (!comm[0])
120            return "startup";
121
122        return comm;
123    }
124
125    StackTrace::StackTrace()
126        : tc(0), stack(64)
127    {
128    }
129
130    StackTrace::StackTrace(ThreadContext *_tc, StaticInstPtr inst)
131        : tc(0), stack(64)
132    {
133        trace(_tc, inst);
134    }
135
136    StackTrace::~StackTrace()
137    {
138    }
139
140    void
141    StackTrace::trace(ThreadContext *_tc, bool is_call)
142    {
143    }
144
145    bool
146    StackTrace::isEntry(Addr addr)
147    {
148        return false;
149    }
150
151    bool
152    StackTrace::decodeStack(MachInst inst, int &disp)
153    {
154        disp = 0;
155        return true;
156    }
157
158    bool
159    StackTrace::decodeSave(MachInst inst, int &reg, int &disp)
160    {
161        reg = 0;
162        disp = 0;
163        return true;
164    }
165
166    /*
167     * Decode the function prologue for the function we're in, and note
168     * which registers are stored where, and how large the stack frame is.
169     */
170    bool
171    StackTrace::decodePrologue(Addr sp, Addr callpc, Addr func,
172                               int &size, Addr &ra)
173    {
174        size = 0;
175        ra = 0;
176
177        for (Addr pc = func; pc < callpc; pc += sizeof(MachInst)) {
178            MachInst inst;
179            CopyOut(tc, (uint8_t *)&inst, pc, sizeof(MachInst));
180
181            int reg, disp;
182            if (decodeStack(inst, disp)) {
183                if (size) {
184                    // panic("decoding frame size again");
185                    return true;
186                }
187                size += disp;
188            } else if (decodeSave(inst, reg, disp)) {
189                if (!ra && reg == ReturnAddressReg) {
190                    CopyOut(tc, (uint8_t *)&ra, sp + disp, sizeof(Addr));
191                    if (!ra) {
192                        // panic("no return address value pc=%#x\n", pc);
193                        return false;
194                    }
195                }
196            }
197        }
198
199        return true;
200    }
201
202#if TRACING_ON
203    void
204    StackTrace::dump()
205    {
206        StringWrap name(tc->getCpuPtr()->name());
207        SymbolTable *symtab = tc->getSystemPtr()->kernelSymtab;
208
209        DPRINTFN("------ Stack ------\n");
210
211        string symbol;
212        for (int i = 0, size = stack.size(); i < size; ++i) {
213            Addr addr = stack[size - i - 1];
214            if (addr == user)
215                symbol = "user";
216            else if (addr == console)
217                symbol = "console";
218            else if (addr == unknown)
219                symbol = "unknown";
220            else
221                symtab->findSymbol(addr, symbol);
222
223            DPRINTFN("%#x: %s\n", addr, symbol);
224        }
225    }
226#endif
227}
228