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, &regs) != 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