segmentation.py revision 5927:5e3367b103da 
1# Copyright (c) 2007 The Hewlett-Packard Development Company
2# All rights reserved.
3#
4# Redistribution and use of this software in source and binary forms,
5# with or without modification, are permitted provided that the
6# following conditions are met:
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9# use which is NOT directed to receiving any direct monetary
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16#
17# If you wish to use this software or functionality therein that may be
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34# output created using the software may be prepared, but only for
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38# and (ii) such Derivatives of the software include the above copyright
39# notice to acknowledge the contribution from this software where
40# applicable, this list of conditions and the disclaimer below.
41#
42# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
43# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
44# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
45# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
46# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
47# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
48# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
49# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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51# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
52# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
53#
54# Authors: Gabe Black
55
56microcode = '''
57def macroop LGDT_M
58{
59    .adjust_env oszForPseudoDesc
60
61    # Get the limit
62    ld t1, seg, sib, disp, dataSize=2
63    # Get the base
64    ld t2, seg, sib, 'adjustedDisp + 2'
65    wrbase tsg, t2
66    wrlimit tsg, t1
67};
68
69def macroop LGDT_P
70{
71    .adjust_env oszForPseudoDesc
72
73    rdip t7
74    # Get the limit
75    ld t1, seg, riprel, disp, dataSize=2
76    # Get the base
77    ld t2, seg, riprel, 'adjustedDisp + 2'
78    wrbase tsg, t2
79    wrlimit tsg, t1
80};
81
82#
83# These versions are for when the original data size was 16 bits. The base is
84# still 32 bits, but the top byte is zeroed before being used.
85#
86
87def macroop LGDT_16_M
88{
89    .adjust_env oszForPseudoDesc
90
91    # Get the limit
92    ld t1, seg, sib, disp, dataSize=2
93    # Get the base
94    ld t2, seg, sib, 'adjustedDisp + 2', dataSize=4
95    zexti t2, t2, 23, dataSize=8
96    wrbase tsg, t2
97    wrlimit tsg, t1
98};
99
100def macroop LGDT_16_P
101{
102    .adjust_env oszForPseudoDesc
103
104    rdip t7
105    # Get the limit
106    ld t1, seg, riprel, disp, dataSize=2
107    # Get the base
108    ld t2, seg, riprel, 'adjustedDisp + 2', dataSize=4
109    zexti t2, t2, 23, dataSize=8
110    wrbase tsg, t2
111    wrlimit tsg, t1
112};
113
114def macroop LIDT_M
115{
116    .adjust_env oszForPseudoDesc
117
118    # Get the limit
119    ld t1, seg, sib, disp, dataSize=2
120    # Get the base
121    ld t2, seg, sib, 'adjustedDisp + 2'
122    wrbase idtr, t2
123    wrlimit idtr, t1
124};
125
126def macroop LIDT_P
127{
128    .adjust_env oszForPseudoDesc
129
130    rdip t7
131    # Get the limit
132    ld t1, seg, riprel, disp, dataSize=2
133    # Get the base
134    ld t2, seg, riprel, 'adjustedDisp + 2'
135    wrbase idtr, t2
136    wrlimit idtr, t1
137};
138
139#
140# These versions are for when the original data size was 16 bits. The base is
141# still 32 bits, but the top byte is zeroed before being used.
142#
143
144def macroop LIDT_16_M
145{
146    .adjust_env oszForPseudoDesc
147
148    # Get the limit
149    ld t1, seg, sib, disp, dataSize=2
150    # Get the base
151    ld t2, seg, sib, 'adjustedDisp + 2', dataSize=4
152    zexti t2, t2, 23, dataSize=8
153    wrbase idtr, t2
154    wrlimit idtr, t1
155};
156
157def macroop LIDT_16_P
158{
159    .adjust_env oszForPseudoDesc
160
161    rdip t7
162    # Get the limit
163    ld t1, seg, riprel, disp, dataSize=2
164    # Get the base
165    ld t2, seg, riprel, 'adjustedDisp + 2', dataSize=4
166    zexti t2, t2, 23, dataSize=8
167    wrbase idtr, t2
168    wrlimit idtr, t1
169};
170
171def macroop LTR_R
172{
173    chks reg, t0, TRCheck
174    limm t4, 0
175    srli t4, reg, 3, dataSize=2
176    ldst t1, tsg, [8, t4, t0], dataSize=8
177    ld t2, tsg, [8, t4, t0], 8, dataSize=8
178    chks reg, t1, TSSCheck
179    wrdh t3, t1, t2
180    wrdl tr, t1, reg
181    wrbase tr, t3, dataSize=8
182    ori t1, t1, (1 << 9)
183    st t1, tsg, [8, t4, t0], dataSize=8
184};
185
186def macroop LTR_M
187{
188    ld t5, seg, sib, disp, dataSize=2
189    chks t5, t0, TRCheck
190    limm t4, 0
191    srli t4, t5, 3, dataSize=2
192    ldst t1, tsg, [8, t4, t0], dataSize=8
193    ld t2, tsg, [8, t4, t0], 8, dataSize=8
194    chks t5, t1, TSSCheck
195    wrdh t3, t1, t2
196    wrdl tr, t1, t5
197    wrbase tr, t3, dataSize=8
198    ori t1, t1, (1 << 9)
199    st t1, tsg, [8, t4, t0], dataSize=8
200};
201
202def macroop LTR_P
203{
204    rdip t7
205    ld t5, seg, riprel, disp, dataSize=2
206    chks t5, t0, TRCheck
207    limm t4, 0
208    srli t4, t5, 3, dataSize=2
209    ldst t1, tsg, [8, t4, t0], dataSize=8
210    ld t2, tsg, [8, t4, t0], 8, dataSize=8
211    chks t5, t1, TSSCheck
212    wrdh t3, t1, t2
213    wrdl tr, t1, t5
214    wrbase tr, t3, dataSize=8
215    ori t1, t1, (1 << 9)
216    st t1, tsg, [8, t4, t0], dataSize=8
217};
218
219def macroop SWAPGS
220{
221    rdval t1, kernel_gs_base, dataSize=8
222    rdbase t2, gs, dataSize=8
223    wrbase gs, t1, dataSize=8
224    wrval kernel_gs_base, t2, dataSize=8
225};
226'''
227