2 * Copyright (c) 2007 The Hewlett-Packard Development Company
5 * Redistribution and use of this software in source and binary forms,
6 * with or without modification, are permitted provided that the
7 * following conditions are met:
9 * The software must be used only for Non-Commercial Use which means any
10 * use which is NOT directed to receiving any direct monetary
11 * compensation for, or commercial advantage from such use. Illustrative
12 * examples of non-commercial use are academic research, personal study,
13 * teaching, education and corporate research & development.
14 * Illustrative examples of commercial use are distributing products for
15 * commercial advantage and providing services using the software for
16 * commercial advantage.
18 * If you wish to use this software or functionality therein that may be
19 * covered by patents for commercial use, please contact:
20 * Director of Intellectual Property Licensing
21 * Office of Strategy and Technology
22 * Hewlett-Packard Company
24 * Palo Alto, California 94304
26 * Redistributions of source code must retain the above copyright notice,
27 * this list of conditions and the following disclaimer. Redistributions
28 * in binary form must reproduce the above copyright notice, this list of
29 * conditions and the following disclaimer in the documentation and/or
30 * other materials provided with the distribution. Neither the name of
31 * the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
32 * contributors may be used to endorse or promote products derived from
33 * this software without specific prior written permission. No right of
34 * sublicense is granted herewith. Derivatives of the software and
35 * output created using the software may be prepared, but only for
36 * Non-Commercial Uses. Derivatives of the software may be shared with
37 * others provided: (i) the others agree to abide by the list of
38 * conditions herein which includes the Non-Commercial Use restrictions;
39 * and (ii) such Derivatives of the software include the above copyright
40 * notice to acknowledge the contribution from this software where
41 * applicable, this list of conditions and the disclaimer below.
43 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
44 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
45 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
46 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
47 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
49 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
50 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
51 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
52 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
53 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
60 #include "arch/x86/emulenv.hh"
61 #include "base/misc.hh"
63 using namespace X86ISA
;
65 void EmulEnv::doModRM(const ExtMachInst
& machInst
)
67 assert(machInst
.modRM
.mod
!= 3);
68 //Use the SIB byte for addressing if the modrm byte calls for it.
69 if (machInst
.modRM
.rm
== 4 && machInst
.addrSize
!= 2) {
70 scale
= 1 << machInst
.sib
.scale
;
71 index
= machInst
.sib
.index
| (machInst
.rex
.x
<< 3);
72 base
= machInst
.sib
.base
| (machInst
.rex
.b
<< 3);
73 //In this special case, we don't use a base. The displacement also
74 //changes, but that's managed by the predecoder.
75 if (machInst
.sib
.base
== INTREG_RBP
&& machInst
.modRM
.mod
== 0)
77 //In -this- special case, we don't use an index.
78 if (index
== INTREG_RSP
)
81 if (machInst
.addrSize
== 2) {
82 unsigned rm
= machInst
.modRM
.rm
;
90 index
= (rm
% 2) ? INTREG_RDI
: INTREG_RSI
;
110 base
= machInst
.modRM
.rm
| (machInst
.rex
.b
<< 3);
111 if (machInst
.modRM
.mod
== 0 && machInst
.modRM
.rm
== 5) {
112 //Since we need to use a different encoding of this
113 //instruction anyway, just ignore the base in those cases
118 //Figure out what segment to use. This won't be entirely accurate since
119 //the presence of a displacement is supposed to make the instruction
120 //default to the data segment.
121 if ((base
!= INTREG_RBP
&& base
!= INTREG_RSP
) || machInst
.dispSize
) {
122 seg
= SEGMENT_REG_DS
;
123 //Handle any segment override that might have been in the instruction
124 int segFromInst
= machInst
.legacy
.seg
;
126 seg
= (SegmentRegIndex
)(segFromInst
- 1);
128 seg
= SEGMENT_REG_SS
;
132 void EmulEnv::setSeg(const ExtMachInst
& machInst
)
134 seg
= SEGMENT_REG_DS
;
135 //Handle any segment override that might have been in the instruction
136 int segFromInst
= machInst
.legacy
.seg
;
138 seg
= (SegmentRegIndex
)(segFromInst
- 1);