emulenv.cc (5966:833e487aa8f7) emulenv.cc (6071:551b62d68f43)
1/*
2 * Copyright (c) 2007 The Hewlett-Packard Development Company
3 * All rights reserved.
4 *
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:
8 *
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.
17 *
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
23 * 1501 Page Mill Road
24 * Palo Alto, California 94304
25 *
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.
42 *
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.
54 *
55 * Authors: Gabe Black
56 */
57
58#include <cassert>
59
60#include "arch/x86/emulenv.hh"
61#include "base/misc.hh"
62
63using namespace X86ISA;
64
65void EmulEnv::doModRM(const ExtMachInst & machInst)
66{
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)
76 base = NUM_INTREGS;
77 //In -this- special case, we don't use an index.
78 if (index == INTREG_RSP)
79 index = NUM_INTREGS;
80 } else {
81 if (machInst.addrSize == 2) {
1/*
2 * Copyright (c) 2007 The Hewlett-Packard Development Company
3 * All rights reserved.
4 *
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:
8 *
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.
17 *
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
23 * 1501 Page Mill Road
24 * Palo Alto, California 94304
25 *
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.
42 *
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.
54 *
55 * Authors: Gabe Black
56 */
57
58#include <cassert>
59
60#include "arch/x86/emulenv.hh"
61#include "base/misc.hh"
62
63using namespace X86ISA;
64
65void EmulEnv::doModRM(const ExtMachInst & machInst)
66{
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)
76 base = NUM_INTREGS;
77 //In -this- special case, we don't use an index.
78 if (index == INTREG_RSP)
79 index = NUM_INTREGS;
80 } else {
81 if (machInst.addrSize == 2) {
82 warn("I'm not really using 16 bit MODRM like I'm supposed to!\n");
82 unsigned rm = machInst.modRM.rm;
83 if (rm <= 3) {
84 scale = 1;
85 if (rm < 2) {
86 base = INTREG_RBX;
87 } else {
88 base = INTREG_RBP;
89 }
90 index = (rm % 2) ? INTREG_RDI : INTREG_RSI;
91 } else {
92 scale = 0;
93 switch (rm) {
94 case 4:
95 base = INTREG_RSI;
96 break;
97 case 5:
98 base = INTREG_RDI;
99 break;
100 case 6:
101 base = INTREG_RBP;
102 break;
103 case 7:
104 base = INTREG_RBX;
105 break;
106 }
107 }
83 } else {
84 scale = 0;
85 base = machInst.modRM.rm | (machInst.rex.b << 3);
86 if (machInst.modRM.mod == 0 && machInst.modRM.rm == 5) {
87 //Since we need to use a different encoding of this
88 //instruction anyway, just ignore the base in those cases
89 base = NUM_INTREGS;
90 }
91 }
92 }
93 //Figure out what segment to use. This won't be entirely accurate since
94 //the presence of a displacement is supposed to make the instruction
95 //default to the data segment.
96 if ((base != INTREG_RBP && base != INTREG_RSP) ||
97 0/*Has an immediate offset*/) {
98 seg = SEGMENT_REG_DS;
99 //Handle any segment override that might have been in the instruction
100 int segFromInst = machInst.legacy.seg;
101 if (segFromInst)
102 seg = (SegmentRegIndex)(segFromInst - 1);
103 } else {
104 seg = SEGMENT_REG_SS;
105 }
106}
107
108void EmulEnv::setSeg(const ExtMachInst & machInst)
109{
110 seg = SEGMENT_REG_DS;
111 //Handle any segment override that might have been in the instruction
112 int segFromInst = machInst.legacy.seg;
113 if (segFromInst)
114 seg = (SegmentRegIndex)(segFromInst - 1);
115}
108 } else {
109 scale = 0;
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
114 base = NUM_INTREGS;
115 }
116 }
117 }
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) ||
122 0/*Has an immediate offset*/) {
123 seg = SEGMENT_REG_DS;
124 //Handle any segment override that might have been in the instruction
125 int segFromInst = machInst.legacy.seg;
126 if (segFromInst)
127 seg = (SegmentRegIndex)(segFromInst - 1);
128 } else {
129 seg = SEGMENT_REG_SS;
130 }
131}
132
133void EmulEnv::setSeg(const ExtMachInst & machInst)
134{
135 seg = SEGMENT_REG_DS;
136 //Handle any segment override that might have been in the instruction
137 int segFromInst = machInst.legacy.seg;
138 if (segFromInst)
139 seg = (SegmentRegIndex)(segFromInst - 1);
140}