segmentation.py revision 7087:fb8d5786ff30 
1# Copyright (c) 2007 The Hewlett-Packard Development Company
2# All rights reserved.
3#
4# The license below extends only to copyright in the software and shall
5# not be construed as granting a license to any other intellectual
6# property including but not limited to intellectual property relating
7# to a hardware implementation of the functionality of the software
8# licensed hereunder.  You may use the software subject to the license
9# terms below provided that you ensure that this notice is replicated
10# unmodified and in its entirety in all distributions of the software,
11# modified or unmodified, in source code or in binary form.
12#
13# Redistribution and use in source and binary forms, with or without
14# modification, are permitted provided that the following conditions are
15# met: redistributions of source code must retain the above copyright
16# notice, this list of conditions and the following disclaimer;
17# redistributions in binary form must reproduce the above copyright
18# notice, this list of conditions and the following disclaimer in the
19# documentation and/or other materials provided with the distribution;
20# neither the name of the copyright holders nor the names of its
21# contributors may be used to endorse or promote products derived from
22# this software without specific prior written permission.
23#
24# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
27# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
28# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
30# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
34# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35#
36# Authors: Gabe Black
37
38microcode = '''
39def macroop LGDT_M
40{
41    .adjust_env maxOsz
42
43    # Get the limit
44    ld t1, seg, sib, disp, dataSize=2
45    # Get the base
46    ld t2, seg, sib, 'adjustedDisp + 2'
47    wrbase tsg, t2
48    wrlimit tsg, t1
49};
50
51def macroop LGDT_P
52{
53    .adjust_env maxOsz
54
55    rdip t7
56    # Get the limit
57    ld t1, seg, riprel, disp, dataSize=2
58    # Get the base
59    ld t2, seg, riprel, 'adjustedDisp + 2'
60    wrbase tsg, t2
61    wrlimit tsg, t1
62};
63
64#
65# These versions are for when the original data size was 16 bits. The base is
66# still 32 bits, but the top byte is zeroed before being used.
67#
68
69def macroop LGDT_16_M
70{
71    .adjust_env maxOsz
72
73    # Get the limit
74    ld t1, seg, sib, disp, dataSize=2
75    # Get the base
76    ld t2, seg, sib, 'adjustedDisp + 2', dataSize=4
77    zexti t2, t2, 23, dataSize=8
78    wrbase tsg, t2
79    wrlimit tsg, t1
80};
81
82def macroop LGDT_16_P
83{
84    .adjust_env maxOsz
85
86    rdip t7
87    # Get the limit
88    ld t1, seg, riprel, disp, dataSize=2
89    # Get the base
90    ld t2, seg, riprel, 'adjustedDisp + 2', dataSize=4
91    zexti t2, t2, 23, dataSize=8
92    wrbase tsg, t2
93    wrlimit tsg, t1
94};
95
96def macroop LIDT_M
97{
98    .adjust_env maxOsz
99
100    # Get the limit
101    ld t1, seg, sib, disp, dataSize=2
102    # Get the base
103    ld t2, seg, sib, 'adjustedDisp + 2'
104    wrbase idtr, t2
105    wrlimit idtr, t1
106};
107
108def macroop LIDT_P
109{
110    .adjust_env maxOsz
111
112    rdip t7
113    # Get the limit
114    ld t1, seg, riprel, disp, dataSize=2
115    # Get the base
116    ld t2, seg, riprel, 'adjustedDisp + 2'
117    wrbase idtr, t2
118    wrlimit idtr, t1
119};
120
121#
122# These versions are for when the original data size was 16 bits. The base is
123# still 32 bits, but the top byte is zeroed before being used.
124#
125
126def macroop LIDT_16_M
127{
128    .adjust_env maxOsz
129
130    # Get the limit
131    ld t1, seg, sib, disp, dataSize=2
132    # Get the base
133    ld t2, seg, sib, 'adjustedDisp + 2', dataSize=4
134    zexti t2, t2, 23, dataSize=8
135    wrbase idtr, t2
136    wrlimit idtr, t1
137};
138
139def macroop LIDT_16_P
140{
141    .adjust_env maxOsz
142
143    rdip t7
144    # Get the limit
145    ld t1, seg, riprel, disp, dataSize=2
146    # Get the base
147    ld t2, seg, riprel, 'adjustedDisp + 2', dataSize=4
148    zexti t2, t2, 23, dataSize=8
149    wrbase idtr, t2
150    wrlimit idtr, t1
151};
152
153def macroop LTR_R
154{
155    chks reg, t0, TRCheck
156    limm t4, 0, dataSize=8
157    srli t4, reg, 3, dataSize=2
158    ldst t1, tsg, [8, t4, t0], dataSize=8
159    ld t2, tsg, [8, t4, t0], 8, dataSize=8
160    chks reg, t1, TSSCheck
161    wrdh t3, t1, t2
162    wrdl tr, t1, reg
163    wrbase tr, t3, dataSize=8
164    limm t5, (1 << 9)
165    or t1, t1, t5
166    st t1, tsg, [8, t4, t0], dataSize=8
167};
168
169def macroop LTR_M
170{
171    ld t5, seg, sib, disp, dataSize=2
172    chks t5, t0, TRCheck
173    limm t4, 0, dataSize=8
174    srli t4, t5, 3, dataSize=2
175    ldst t1, tsg, [8, t4, t0], dataSize=8
176    ld t2, tsg, [8, t4, t0], 8, dataSize=8
177    chks t5, t1, TSSCheck
178    wrdh t3, t1, t2
179    wrdl tr, t1, t5
180    wrbase tr, t3, dataSize=8
181    limm t5, (1 << 9)
182    or t1, t1, t5
183    st t1, tsg, [8, t4, t0], dataSize=8
184};
185
186def macroop LTR_P
187{
188    rdip t7
189    ld t5, seg, riprel, disp, dataSize=2
190    chks t5, t0, TRCheck
191    limm t4, 0, dataSize=8
192    srli t4, t5, 3, dataSize=2
193    ldst t1, tsg, [8, t4, t0], dataSize=8
194    ld t2, tsg, [8, t4, t0], 8, dataSize=8
195    chks t5, t1, TSSCheck
196    wrdh t3, t1, t2
197    wrdl tr, t1, t5
198    wrbase tr, t3, dataSize=8
199    limm t5, (1 << 9)
200    or t1, t1, t5
201    st t1, tsg, [8, t4, t0], dataSize=8
202};
203
204def macroop LLDT_R
205{
206    chks reg, t0, InGDTCheck, flags=(EZF,)
207    br label("end"), flags=(CEZF,)
208    limm t4, 0, dataSize=8
209    srli t4, reg, 3, dataSize=2
210    ldst t1, tsg, [8, t4, t0], dataSize=8
211    ld t2, tsg, [8, t4, t0], 8, dataSize=8
212    chks reg, t1, LDTCheck
213    wrdh t3, t1, t2
214    wrdl tr, t1, reg
215    wrbase tr, t3, dataSize=8
216end:
217    fault "NoFault"
218};
219
220def macroop LLDT_M
221{
222    ld t5, seg, sib, disp, dataSize=2
223    chks t5, t0, InGDTCheck, flags=(EZF,)
224    br label("end"), flags=(CEZF,)
225    limm t4, 0, dataSize=8
226    srli t4, t5, 3, dataSize=2
227    ldst t1, tsg, [8, t4, t0], dataSize=8
228    ld t2, tsg, [8, t4, t0], 8, dataSize=8
229    chks t5, t1, LDTCheck
230    wrdh t3, t1, t2
231    wrdl tr, t1, t5
232    wrbase tr, t3, dataSize=8
233end:
234    fault "NoFault"
235};
236
237def macroop LLDT_P
238{
239    rdip t7
240    ld t5, seg, riprel, disp, dataSize=2
241    chks t5, t0, InGDTCheck, flags=(EZF,)
242    br label("end"), flags=(CEZF,)
243    limm t4, 0, dataSize=8
244    srli t4, t5, 3, dataSize=2
245    ldst t1, tsg, [8, t4, t0], dataSize=8
246    ld t2, tsg, [8, t4, t0], 8, dataSize=8
247    chks t5, t1, LDTCheck
248    wrdh t3, t1, t2
249    wrdl tr, t1, t5
250    wrbase tr, t3, dataSize=8
251end:
252    fault "NoFault"
253};
254
255def macroop SWAPGS
256{
257    rdval t1, kernel_gs_base, dataSize=8
258    rdbase t2, gs, dataSize=8
259    wrbase gs, t1, dataSize=8
260    wrval kernel_gs_base, t2, dataSize=8
261};
262'''
263