stacktrace.cc revision 5086 
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        tc->delVirtPort(vp);
75    }
76
77    Addr
78    ProcessInfo::task(Addr ksp) const
79    {
80        Addr base = ksp & ~0x3fff;
81        if (base == ULL(0xfffffc0000000000))
82            return 0;
83
84        Addr tsk;
85
86        VirtualPort *vp;
87
88        vp = tc->getVirtPort();
89        tsk = vp->readGtoH<Addr>(base + task_off);
90        tc->delVirtPort(vp);
91
92        return tsk;
93    }
94
95    int
96    ProcessInfo::pid(Addr ksp) const
97    {
98        Addr task = this->task(ksp);
99        if (!task)
100            return -1;
101
102        uint16_t pd;
103
104        VirtualPort *vp;
105
106        vp = tc->getVirtPort();
107        pd = vp->readGtoH<uint16_t>(task + pid_off);
108        tc->delVirtPort(vp);
109
110        return pd;
111    }
112
113    string
114    ProcessInfo::name(Addr ksp) const
115    {
116        Addr task = this->task(ksp);
117        if (!task)
118            return "console";
119
120        char comm[256];
121        CopyStringOut(tc, comm, task + name_off, sizeof(comm));
122        if (!comm[0])
123            return "startup";
124
125        return comm;
126    }
127
128    StackTrace::StackTrace()
129        : tc(0), stack(64)
130    {
131    }
132
133    StackTrace::StackTrace(ThreadContext *_tc, StaticInstPtr inst)
134        : tc(0), stack(64)
135    {
136        trace(_tc, inst);
137    }
138
139    StackTrace::~StackTrace()
140    {
141    }
142
143    void
144    StackTrace::trace(ThreadContext *_tc, bool is_call)
145    {
146    }
147
148    bool
149    StackTrace::isEntry(Addr addr)
150    {
151        return false;
152    }
153
154    bool
155    StackTrace::decodeStack(MachInst inst, int &disp)
156    {
157        return true;
158    }
159
160    bool
161    StackTrace::decodeSave(MachInst inst, int &reg, int &disp)
162    {
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