1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/* prmcw3i6.c: MUTATOR CONTEXT INTEL x64 (Windows)
*
* $Id$
* Copyright (c) 2001-2020 Ravenbrook Limited. See end of file for license.
*
* PURPOSE
*
* .purpose: Implement the mutator context module. <design/prmc>.
*
* SOURCES
*
*
* ASSUMPTIONS
*
* .assume.regref: The registers in the context can be modified by
* storing into an MRef pointer.
*
* .assume.sp: The stack pointer is stored in CONTEXT.Rsp. This
* requires CONTEXT_CONTROL to be set in ContextFlags when
* GetThreadContext is called.
*/
#include "prmcw3.h"
#include "prmci6.h"
#include "mpm.h"
SRCID(prmcw3i6, "$Id$");
#if !defined(MPS_OS_W3) || !defined(MPS_ARCH_I6)
#error "prmcw3i6.c is specific to MPS_OS_W3 and MPS_ARCH_I6"
#endif
/* Prmci6AddressHoldingReg -- Return an address for a given machine register */
MRef Prmci6AddressHoldingReg(MutatorContext context, unsigned int regnum)
{
PCONTEXT wincont;
AVERT(MutatorContext, context);
AVER(context->var == MutatorContextFAULT);
AVER(NONNEGATIVE(regnum));
AVER(regnum <= 16);
wincont = context->the.ep->ContextRecord;
switch (regnum) {
case 0: return (MRef)&wincont->Rax;
case 1: return (MRef)&wincont->Rcx;
case 2: return (MRef)&wincont->Rdx;
case 3: return (MRef)&wincont->Rbx;
case 4: return (MRef)&wincont->Rsp;
case 5: return (MRef)&wincont->Rbp;
case 6: return (MRef)&wincont->Rsi;
case 7: return (MRef)&wincont->Rdi;
case 8: return (MRef)&wincont->R8;
case 9: return (MRef)&wincont->R9;
case 10: return (MRef)&wincont->R10;
case 11: return (MRef)&wincont->R11;
case 12: return (MRef)&wincont->R12;
case 13: return (MRef)&wincont->R13;
case 14: return (MRef)&wincont->R14;
case 15: return (MRef)&wincont->R15;
default:
NOTREACHED;
return NULL; /* suppress warning */
}
}
/* Prmci6DecodeFaultContext -- decode fault context */
void Prmci6DecodeFaultContext(MRef *faultmemReturn, Byte **insvecReturn,
MutatorContext context)
{
LPEXCEPTION_RECORD er;
AVER(faultmemReturn != NULL);
AVER(insvecReturn != NULL);
AVERT(MutatorContext, context);
AVER(context->var == MutatorContextFAULT);
er = context->the.ep->ExceptionRecord;
/* Assert that this is an access violation. The computation of */
/* faultmem depends on this. */
AVER(er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION);
*faultmemReturn = (MRef)er->ExceptionInformation[1];
*insvecReturn = (Byte*)context->the.ep->ContextRecord->Rip;
}
/* Prmci6StepOverIns -- skip an instruction by changing the context */
void Prmci6StepOverIns(MutatorContext context, Size inslen)
{
AVERT(MutatorContext, context);
AVER(context->var == MutatorContextFAULT);
context->the.ep->ContextRecord->Rip += (DWORD64)inslen;
}
Addr MutatorContextSP(MutatorContext context)
{
AVERT(MutatorContext, context);
AVER(context->var == MutatorContextTHREAD);
return (Addr)context->the.context.Rsp; /* .assume.sp */
}
/* C. COPYRIGHT AND LICENSE
*
* Copyright (C) 2001-2020 Ravenbrook Limited <https://www.ravenbrook.com/>.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
|
