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 <sys/ptrace.h>
32#include <stdint.h>
33
34#include <cerrno>
35#include <iostream>
36
37#include "arch/i686/tracechild.hh"
38
39using namespace std;
40
41int64_t
42I686TraceChild::getRegs(user_regs_struct & myregs, int num)
43{
44    assert(num < numregs && num >= 0);
45    switch (num) {
46      //GPRs
47      case EAX: return myregs.eax;
48      case EBX: return myregs.ebx;
49      case ECX: return myregs.ecx;
50      case EDX: return myregs.edx;
51      //Index registers
52      case ESI: return myregs.esi;
53      case EDI: return myregs.edi;
54      //Base pointer and stack pointer
55      case EBP: return myregs.ebp;
56      case ESP: return myregs.esp;
57      //Segmentation registers
58      case CS: return myregs.xcs;
59      case DS: return myregs.xds;
60      case ES: return myregs.xes;
61      case FS: return myregs.xfs;
62      case GS: return myregs.xgs;
63      case SS: return myregs.xss;
64      //PC
65      case EIP: return myregs.eip;
66      default:
67        assert(0);
68        return 0;
69    }
70}
71
72bool
73I686TraceChild::update(int pid)
74{
75    oldregs = regs;
76    if (ptrace(PTRACE_GETREGS, pid, 0, &regs) != 0)
77        return false;
78    for (unsigned int x = 0; x < numregs; x++) {
79        regDiffSinceUpdate[x] = (getRegVal(x) != getOldRegVal(x));
80    }
81}
82
83I686TraceChild::I686TraceChild()
84{
85    for (unsigned int x = 0; x < numregs; x++)
86        regDiffSinceUpdate[x] = false;
87}
88
89int64_t
90I686TraceChild::getRegVal(int num)
91{
92    return getRegs(regs, num);
93}
94
95int64_t
96I686TraceChild::getOldRegVal(int num)
97{
98    return getRegs(oldregs, num);
99}
100
101bool
102I686TraceChild::sendState(int socket)
103{
104    return false;
105}
106
107TraceChild *
108genTraceChild()
109{
110    return new I686TraceChild;
111}
112