stacktrace.cc revision 5499:8bfc7650c344 
1/*
2 * Copyright (c) 2004-2005 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/mips/isa_traits.hh"
34#include "arch/mips/stacktrace.hh"
35#include "arch/mips/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;
43using namespace MipsISA;
44
45ProcessInfo::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
75Addr
76ProcessInfo::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
92int
93ProcessInfo::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
109string
110ProcessInfo::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
124StackTrace::StackTrace()
125    : tc(0), stack(64)
126{
127}
128
129StackTrace::StackTrace(ThreadContext *_tc, StaticInstPtr inst)
130    : tc(0), stack(64)
131{
132    trace(_tc, inst);
133}
134
135StackTrace::~StackTrace()
136{
137}
138
139void
140StackTrace::trace(ThreadContext *_tc, bool is_call)
141{
142    tc = _tc;
143    /* FIXME - Jaidev - What is IPR_DTB_CM in Alpha? */
144    bool usermode = 0;
145      //(tc->readMiscReg(MipsISA::IPR_DTB_CM) & 0x18) != 0;
146
147//     Addr pc = tc->readNextPC();
148//     bool kernel = tc->getSystemPtr()->kernelStart <= pc &&
149//         pc <= tc->getSystemPtr()->kernelEnd;
150
151    if (usermode) {
152        stack.push_back(user);
153        return;
154    }
155
156//     if (!kernel) {
157//         stack.push_back(console);
158//         return;
159//     }
160
161//     SymbolTable *symtab = tc->getSystemPtr()->kernelSymtab;
162//     Addr ksp = tc->readIntReg(TheISA::StackPointerReg);
163//     Addr bottom = ksp & ~0x3fff;
164//     Addr addr;
165
166//     if (is_call) {
167//         if (!symtab->findNearestAddr(pc, addr))
168//             panic("could not find address %#x", pc);
169
170//         stack.push_back(addr);
171//         pc = tc->readPC();
172//     }
173
174//     Addr ra;
175//     int size;
176
177//     while (ksp > bottom) {
178//         if (!symtab->findNearestAddr(pc, addr))
179//             panic("could not find symbol for pc=%#x", pc);
180//         assert(pc >= addr && "symbol botch: callpc < func");
181
182//         stack.push_back(addr);
183
184//         if (isEntry(addr))
185//             return;
186
187//         if (decodePrologue(ksp, pc, addr, size, ra)) {
188//             if (!ra)
189//                 return;
190
191//             if (size <= 0) {
192//                 stack.push_back(unknown);
193//                 return;
194//             }
195
196//             pc = ra;
197//             ksp += size;
198//         } else {
199//             stack.push_back(unknown);
200//             return;
201//         }
202
203//         bool kernel = tc->getSystemPtr()->kernelStart <= pc &&
204//             pc <= tc->getSystemPtr()->kernelEnd;
205//         if (!kernel)
206//             return;
207
208//         if (stack.size() >= 1000)
209//             panic("unwinding too far");
210//     }
211
212//     panic("unwinding too far");
213}
214
215bool
216StackTrace::isEntry(Addr addr)
217{
218  /*    if (addr == tc->readMiscReg(MipsISA::IPR_PALtemp2))
219        return true;*/
220
221    return false;
222}
223
224bool
225StackTrace::decodeStack(MachInst inst, int &disp)
226{
227    // lda $sp, -disp($sp)
228    //
229    // Opcode<31:26> == 0x08
230    // RA<25:21> == 30
231    // RB<20:16> == 30
232    // Disp<15:0>
233    const MachInst mem_mask = 0xffff0000;
234    const MachInst lda_pattern = 0x23de0000;
235    const MachInst lda_disp_mask = 0x0000ffff;
236
237    // subq $sp, disp, $sp
238    // addq $sp, disp, $sp
239    //
240    // Opcode<31:26> == 0x10
241    // RA<25:21> == 30
242    // Lit<20:13>
243    // One<12> = 1
244    // Func<11:5> == 0x20 (addq)
245    // Func<11:5> == 0x29 (subq)
246    // RC<4:0> == 30
247    const MachInst intop_mask = 0xffe01fff;
248    const MachInst addq_pattern = 0x43c0141e;
249    const MachInst subq_pattern = 0x43c0153e;
250    const MachInst intop_disp_mask = 0x001fe000;
251    const int intop_disp_shift = 13;
252
253    if ((inst & mem_mask) == lda_pattern)
254        disp = -sext<16>(inst & lda_disp_mask);
255    else if ((inst & intop_mask) == addq_pattern)
256        disp = -int((inst & intop_disp_mask) >> intop_disp_shift);
257    else if ((inst & intop_mask) == subq_pattern)
258        disp = int((inst & intop_disp_mask) >> intop_disp_shift);
259    else
260        return false;
261
262    return true;
263}
264
265bool
266StackTrace::decodeSave(MachInst inst, int &reg, int &disp)
267{
268    // lda $stq, disp($sp)
269    //
270    // Opcode<31:26> == 0x08
271    // RA<25:21> == ?
272    // RB<20:16> == 30
273    // Disp<15:0>
274    const MachInst stq_mask = 0xfc1f0000;
275    const MachInst stq_pattern = 0xb41e0000;
276    const MachInst stq_disp_mask = 0x0000ffff;
277    const MachInst reg_mask = 0x03e00000;
278    const int reg_shift = 21;
279
280    if ((inst & stq_mask) == stq_pattern) {
281        reg = (inst & reg_mask) >> reg_shift;
282        disp = sext<16>(inst & stq_disp_mask);
283    } else {
284        return false;
285    }
286
287    return true;
288}
289
290/*
291 * Decode the function prologue for the function we're in, and note
292 * which registers are stored where, and how large the stack frame is.
293 */
294bool
295StackTrace::decodePrologue(Addr sp, Addr callpc, Addr func,
296                           int &size, Addr &ra)
297{
298    size = 0;
299    ra = 0;
300
301    for (Addr pc = func; pc < callpc; pc += sizeof(MachInst)) {
302        MachInst inst;
303        CopyOut(tc, (uint8_t *)&inst, pc, sizeof(MachInst));
304
305        int reg, disp;
306        if (decodeStack(inst, disp)) {
307            if (size) {
308                // panic("decoding frame size again");
309                return true;
310            }
311            size += disp;
312        } else if (decodeSave(inst, reg, disp)) {
313            if (!ra && reg == ReturnAddressReg) {
314                CopyOut(tc, (uint8_t *)&ra, sp + disp, sizeof(Addr));
315                if (!ra) {
316                    // panic("no return address value pc=%#x\n", pc);
317                    return false;
318                }
319            }
320        }
321    }
322
323    return true;
324}
325
326#if TRACING_ON
327void
328StackTrace::dump()
329{
330    StringWrap name(tc->getCpuPtr()->name());
331//     SymbolTable *symtab = tc->getSystemPtr()->kernelSymtab;
332
333    DPRINTFN("------ Stack ------\n");
334
335//     string symbol;
336//     for (int i = 0, size = stack.size(); i < size; ++i) {
337//         Addr addr = stack[size - i - 1];
338//         if (addr == user)
339//             symbol = "user";
340//         else if (addr == console)
341//             symbol = "console";
342//         else if (addr == unknown)
343//             symbol = "unknown";
344//         else
345//             symtab->findSymbol(addr, symbol);
346
347//         DPRINTFN("%#x: %s\n", addr, symbol);
348//     }
349}
350#endif
351