stacktrace.cc revision 11793
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 "arch/x86/stacktrace.hh" 32 33#include <string> 34 35#include "arch/x86/isa_traits.hh" 36#include "arch/x86/vtophys.hh" 37#include "base/bitfield.hh" 38#include "base/trace.hh" 39#include "cpu/base.hh" 40#include "cpu/thread_context.hh" 41#include "mem/fs_translating_port_proxy.hh" 42#include "sim/system.hh" 43 44using namespace std; 45namespace X86ISA 46{ 47 ProcessInfo::ProcessInfo(ThreadContext *_tc) 48 : tc(_tc) 49 { 50 Addr addr = 0; 51 52 FSTranslatingPortProxy &vp = tc->getVirtProxy(); 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 75 Addr 76 ProcessInfo::task(Addr ksp) const 77 { 78 Addr base = ksp & ~0x3fff; 79 if (base == ULL(0xfffffc0000000000)) 80 return 0; 81 82 Addr tsk; 83 84 FSTranslatingPortProxy &vp = tc->getVirtProxy(); 85 tsk = vp.readGtoH<Addr>(base + task_off); 86 87 return tsk; 88 } 89 90 int 91 ProcessInfo::pid(Addr ksp) const 92 { 93 Addr task = this->task(ksp); 94 if (!task) 95 return -1; 96 97 uint16_t pd; 98 99 FSTranslatingPortProxy &vp = tc->getVirtProxy(); 100 pd = vp.readGtoH<uint16_t>(task + pid_off); 101 102 return pd; 103 } 104 105 string 106 ProcessInfo::name(Addr ksp) const 107 { 108 Addr task = this->task(ksp); 109 if (!task) 110 return "console"; 111 112 char comm[256]; 113 CopyStringOut(tc, comm, task + name_off, sizeof(comm)); 114 if (!comm[0]) 115 return "startup"; 116 117 return comm; 118 } 119 120 StackTrace::StackTrace() 121 : tc(0), stack(64) 122 { 123 } 124 125 StackTrace::StackTrace(ThreadContext *_tc, const StaticInstPtr &inst) 126 : tc(0), stack(64) 127 { 128 trace(_tc, inst); 129 } 130 131 StackTrace::~StackTrace() 132 { 133 } 134 135 void 136 StackTrace::trace(ThreadContext *_tc, bool is_call) 137 { 138 } 139 140 bool 141 StackTrace::isEntry(Addr addr) 142 { 143 return false; 144 } 145 146 bool 147 StackTrace::decodeStack(MachInst inst, int &disp) 148 { 149 disp = 0; 150 return true; 151 } 152 153 bool 154 StackTrace::decodeSave(MachInst inst, int ®, int &disp) 155 { 156 reg = 0; 157 disp = 0; 158 return true; 159 } 160 161 /* 162 * Decode the function prologue for the function we're in, and note 163 * which registers are stored where, and how large the stack frame is. 164 */ 165 bool 166 StackTrace::decodePrologue(Addr sp, Addr callpc, Addr func, 167 int &size, Addr &ra) 168 { 169 size = 0; 170 ra = 0; 171 172 for (Addr pc = func; pc < callpc; pc += sizeof(MachInst)) { 173 MachInst inst; 174 CopyOut(tc, (uint8_t *)&inst, pc, sizeof(MachInst)); 175 176 int reg, disp; 177 if (decodeStack(inst, disp)) { 178 if (size) { 179 // panic("decoding frame size again"); 180 return true; 181 } 182 size += disp; 183 } else if (decodeSave(inst, reg, disp)) { 184 if (!ra && reg == ReturnAddressReg) { 185 CopyOut(tc, (uint8_t *)&ra, sp + disp, sizeof(Addr)); 186 if (!ra) { 187 // panic("no return address value pc=%#x\n", pc); 188 return false; 189 } 190 } 191 } 192 } 193 194 return true; 195 } 196 197#if TRACING_ON 198 void 199 StackTrace::dump() 200 { 201 StringWrap name(tc->getCpuPtr()->name()); 202 SymbolTable *symtab = tc->getSystemPtr()->kernelSymtab; 203 204 DPRINTFN("------ Stack ------\n"); 205 206 string symbol; 207 for (int i = 0, size = stack.size(); i < size; ++i) { 208 Addr addr = stack[size - i - 1]; 209 if (addr == user) 210 symbol = "user"; 211 else if (addr == console) 212 symbol = "console"; 213 else if (addr == unknown) 214 symbol = "unknown"; 215 else 216 symtab->findSymbol(addr, symbol); 217 218 DPRINTFN("%#x: %s\n", addr, symbol); 219 } 220 } 221#endif 222} 223