tracechild.cc revision 3115 
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 "tracechild_i386.hh"
37
38using namespace std;
39
40char * I386TraceChild::regNames[numregs] = {
41                //GPRs
42                "eax", "ebx", "ecx", "edx",
43                //Index registers
44                "esi", "edi",
45                //Base pointer and stack pointer
46                "ebp", "esp",
47                //Segmentation registers
48                "cs", "ds", "es", "fs", "gs", "ss",
49                //PC
50                "eip"};
51
52int64_t I386TraceChild::getRegs(user_regs_struct & myregs, int num)
53{
54        assert(num < numregs && num >= 0);
55        switch(num)
56        {
57                //GPRs
58                case EAX: return myregs.eax;
59                case EBX: return myregs.ebx;
60                case ECX: return myregs.ecx;
61                case EDX: return myregs.edx;
62                //Index registers
63                case ESI: return myregs.esi;
64                case EDI: return myregs.edi;
65                //Base pointer and stack pointer
66                case EBP: return myregs.ebp;
67                case ESP: return myregs.esp;
68                //Segmentation registers
69                case CS: return myregs.cs;
70                case DS: return myregs.ds;
71                case ES: return myregs.es;
72                case FS: return myregs.fs;
73                case GS: return myregs.gs;
74                case SS: return myregs.ss;
75                //PC
76                case EIP: return myregs.eip;
77                default:
78                        assert(0);
79                        return 0;
80        }
81}
82
83bool I386TraceChild::update(int pid)
84{
85        oldregs = regs;
86        if(ptrace(PTRACE_GETREGS, pid, 0, &regs) != 0)
87                return false;
88        for(unsigned int x = 0; x < numregs; x++)
89        {
90                regDiffSinceUpdate[x] =
91                        (getRegVal(x) != getOldRegVal(x));
92        }
93}
94
95I386TraceChild::I386TraceChild()
96{
97        for(unsigned int x = 0; x < numregs; x++)
98                regDiffSinceUpdate[x] = false;
99}
100
101int64_t I386TraceChild::getRegVal(int num)
102{
103        return getRegs(regs, num);
104}
105
106int64_t I386TraceChild::getOldRegVal(int num)
107{
108        return getRegs(oldregs, num);
109}
110
111char * I386TraceChild::printReg(int num)
112{
113        sprintf(printBuffer, "0x%08X", getRegVal(num));
114        return printBuffer;
115}
116
117TraceChild * genTraceChild()
118{
119        return new I386TraceChild;
120}
121