tracechild.cc revision 8117:2eec3c58e50e
1/* 2 * Copyright (c) 2006 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: Gabe Black 29 */ 30 31#include <iostream> 32#include <errno.h> 33#include <sys/ptrace.h> 34#include <stdint.h> 35 36#include "arch/i686/tracechild.hh" 37 38using namespace std; 39 40int64_t 41I686TraceChild::getRegs(user_regs_struct & myregs, int num) 42{ 43 assert(num < numregs && num >= 0); 44 switch (num) { 45 //GPRs 46 case EAX: return myregs.eax; 47 case EBX: return myregs.ebx; 48 case ECX: return myregs.ecx; 49 case EDX: return myregs.edx; 50 //Index registers 51 case ESI: return myregs.esi; 52 case EDI: return myregs.edi; 53 //Base pointer and stack pointer 54 case EBP: return myregs.ebp; 55 case ESP: return myregs.esp; 56 //Segmentation registers 57 case CS: return myregs.xcs; 58 case DS: return myregs.xds; 59 case ES: return myregs.xes; 60 case FS: return myregs.xfs; 61 case GS: return myregs.xgs; 62 case SS: return myregs.xss; 63 //PC 64 case EIP: return myregs.eip; 65 default: 66 assert(0); 67 return 0; 68 } 69} 70 71bool 72I686TraceChild::update(int pid) 73{ 74 oldregs = regs; 75 if (ptrace(PTRACE_GETREGS, pid, 0, ®s) != 0) 76 return false; 77 for (unsigned int x = 0; x < numregs; x++) { 78 regDiffSinceUpdate[x] = (getRegVal(x) != getOldRegVal(x)); 79 } 80} 81 82I686TraceChild::I686TraceChild() 83{ 84 for (unsigned int x = 0; x < numregs; x++) 85 regDiffSinceUpdate[x] = false; 86} 87 88int64_t 89I686TraceChild::getRegVal(int num) 90{ 91 return getRegs(regs, num); 92} 93 94int64_t 95I686TraceChild::getOldRegVal(int num) 96{ 97 return getRegs(oldregs, num); 98} 99 100TraceChild * 101genTraceChild() 102{ 103 return new I686TraceChild; 104} 105