stacktrace.cc revision 5087
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 disp = 0; 158 return true; 159 } 160 161 bool 162 StackTrace::decodeSave(MachInst inst, int ®, int &disp) 163 { 164 reg = 0; 165 disp = 0; 166 return true; 167 } 168 169 /* 170 * Decode the function prologue for the function we're in, and note 171 * which registers are stored where, and how large the stack frame is. 172 */ 173 bool 174 StackTrace::decodePrologue(Addr sp, Addr callpc, Addr func, 175 int &size, Addr &ra) 176 { 177 size = 0; 178 ra = 0; 179 180 for (Addr pc = func; pc < callpc; pc += sizeof(MachInst)) { 181 MachInst inst; 182 CopyOut(tc, (uint8_t *)&inst, pc, sizeof(MachInst)); 183 184 int reg, disp; 185 if (decodeStack(inst, disp)) { 186 if (size) { 187 // panic("decoding frame size again"); 188 return true; 189 } 190 size += disp; 191 } else if (decodeSave(inst, reg, disp)) { 192 if (!ra && reg == ReturnAddressReg) { 193 CopyOut(tc, (uint8_t *)&ra, sp + disp, sizeof(Addr)); 194 if (!ra) { 195 // panic("no return address value pc=%#x\n", pc); 196 return false; 197 } 198 } 199 } 200 } 201 202 return true; 203 } 204 205#if TRACING_ON 206 void 207 StackTrace::dump() 208 { 209 StringWrap name(tc->getCpuPtr()->name()); 210 SymbolTable *symtab = tc->getSystemPtr()->kernelSymtab; 211 212 DPRINTFN("------ Stack ------\n"); 213 214 string symbol; 215 for (int i = 0, size = stack.size(); i < size; ++i) { 216 Addr addr = stack[size - i - 1]; 217 if (addr == user) 218 symbol = "user"; 219 else if (addr == console) 220 symbol = "console"; 221 else if (addr == unknown) 222 symbol = "unknown"; 223 else 224 symtab->findSymbol(addr, symbol); 225 226 DPRINTFN("%#x: %s\n", addr, symbol); 227 } 228 } 229#endif 230} 231