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58caa3dc DJ |
1 | /* i387-specific utility functions, for the remote server for GDB. |
2 | Copyright 2000, 2001, 2002 | |
3 | Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "server.h" | |
23 | ||
24 | int num_xmm_registers = 8; | |
25 | ||
26 | /* Note: These functions preserve the reserved bits in control registers. | |
27 | However, gdbserver promptly throws away that information. */ | |
28 | ||
29 | /* These structs should have the proper sizes and alignment on both | |
30 | i386 and x86-64 machines. */ | |
31 | ||
32 | struct i387_fsave { | |
33 | /* All these are only sixteen bits, plus padding, except for fop (which | |
34 | is only eleven bits), and fooff / fioff (which are 32 bits each). */ | |
35 | unsigned int fctrl; | |
36 | unsigned int fstat; | |
37 | unsigned int ftag; | |
38 | unsigned int fioff; | |
39 | unsigned short fiseg; | |
40 | unsigned short fop; | |
41 | unsigned int fooff; | |
42 | unsigned int foseg; | |
43 | ||
44 | /* Space for eight 80-bit FP values. */ | |
45 | char st_space[80]; | |
46 | }; | |
47 | ||
48 | struct i387_fxsave { | |
49 | /* All these are only sixteen bits, plus padding, except for fop (which | |
50 | is only eleven bits), and fooff / fioff (which are 32 bits each). */ | |
51 | unsigned short fctrl; | |
52 | unsigned short fstat; | |
53 | unsigned short ftag; | |
54 | unsigned short fop; | |
55 | unsigned int fioff; | |
56 | unsigned int fiseg; | |
57 | unsigned int fooff; | |
58 | unsigned int foseg; | |
59 | ||
60 | unsigned int mxcsr; | |
61 | ||
62 | unsigned int _pad1; | |
63 | ||
64 | /* Space for eight 80-bit FP values in 128-bit spaces. */ | |
65 | char st_space[128]; | |
66 | ||
67 | /* Space for eight 128-bit XMM values, or 16 on x86-64. */ | |
68 | char xmm_space[256]; | |
69 | }; | |
70 | ||
71 | void | |
72 | i387_cache_to_fsave (void *buf) | |
73 | { | |
74 | struct i387_fsave *fp = (struct i387_fsave *) buf; | |
75 | int i; | |
76 | int st0_regnum = find_regno ("st0"); | |
77 | unsigned long val, val2; | |
78 | ||
79 | for (i = 0; i < 8; i++) | |
80 | collect_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 10); | |
81 | ||
82 | collect_register_by_name ("fioff", &fp->fioff); | |
83 | collect_register_by_name ("fooff", &fp->fooff); | |
84 | ||
85 | /* This one's 11 bits... */ | |
86 | collect_register_by_name ("fop", &val2); | |
87 | fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800); | |
88 | ||
89 | /* Some registers are 16-bit. */ | |
90 | collect_register_by_name ("fctrl", &val); | |
91 | *(unsigned short *) &fp->fctrl = val; | |
92 | ||
93 | collect_register_by_name ("fstat", &val); | |
94 | val &= 0xFFFF; | |
95 | *(unsigned short *) &fp->fstat = val; | |
96 | ||
97 | collect_register_by_name ("ftag", &val); | |
98 | val &= 0xFFFF; | |
99 | *(unsigned short *) &fp->ftag = val; | |
100 | ||
101 | collect_register_by_name ("fiseg", &val); | |
102 | val &= 0xFFFF; | |
103 | *(unsigned short *) &fp->fiseg = val; | |
104 | ||
105 | collect_register_by_name ("foseg", &val); | |
106 | val &= 0xFFFF; | |
107 | *(unsigned short *) &fp->foseg = val; | |
108 | } | |
109 | ||
110 | void | |
111 | i387_fsave_to_cache (void *buf) | |
112 | { | |
113 | struct i387_fsave *fp = (struct i387_fsave *) buf; | |
114 | int i; | |
115 | int st0_regnum = find_regno ("st0"); | |
116 | unsigned long val; | |
117 | ||
118 | for (i = 0; i < 8; i++) | |
119 | supply_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 10); | |
120 | ||
121 | supply_register_by_name ("fioff", &fp->fioff); | |
122 | supply_register_by_name ("fooff", &fp->fooff); | |
123 | ||
124 | /* Some registers are 16-bit. */ | |
125 | val = fp->fctrl & 0xFFFF; | |
126 | supply_register_by_name ("fctrl", &val); | |
127 | ||
128 | val = fp->fstat & 0xFFFF; | |
129 | supply_register_by_name ("fstat", &val); | |
130 | ||
131 | val = fp->ftag & 0xFFFF; | |
132 | supply_register_by_name ("ftag", &val); | |
133 | ||
134 | val = fp->fiseg & 0xFFFF; | |
135 | supply_register_by_name ("fiseg", &val); | |
136 | ||
137 | val = fp->foseg & 0xFFFF; | |
138 | supply_register_by_name ("foseg", &val); | |
139 | ||
140 | val = (fp->fop) & 0x7FF; | |
141 | supply_register_by_name ("fop", &val); | |
142 | } | |
143 | ||
144 | void | |
145 | i387_cache_to_fxsave (void *buf) | |
146 | { | |
147 | struct i387_fxsave *fp = (struct i387_fxsave *) buf; | |
148 | int i; | |
149 | int st0_regnum = find_regno ("st0"); | |
150 | int xmm0_regnum = find_regno ("xmm0"); | |
151 | unsigned long val, val2; | |
152 | ||
153 | for (i = 0; i < 8; i++) | |
154 | collect_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 16); | |
155 | for (i = 0; i < num_xmm_registers; i++) | |
156 | collect_register (i + xmm0_regnum, ((char *) &fp->xmm_space[0]) + i * 16); | |
157 | ||
158 | collect_register_by_name ("fioff", &fp->fioff); | |
159 | collect_register_by_name ("fooff", &fp->fooff); | |
160 | collect_register_by_name ("mxcsr", &fp->mxcsr); | |
161 | ||
162 | /* This one's 11 bits... */ | |
163 | collect_register_by_name ("fop", &val2); | |
164 | fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800); | |
165 | ||
166 | /* Some registers are 16-bit. */ | |
167 | collect_register_by_name ("fctrl", &val); | |
168 | *(unsigned short *) &fp->fctrl = val; | |
169 | ||
170 | collect_register_by_name ("fstat", &val); | |
171 | val &= 0xFFFF; | |
172 | *(unsigned short *) &fp->fstat = val; | |
173 | ||
174 | /* Convert to the simplifed tag form stored in fxsave data. */ | |
175 | collect_register_by_name ("ftag", &val); | |
176 | val &= 0xFFFF; | |
177 | for (i = 7; i >= 0; i--) | |
178 | { | |
179 | int tag = (val >> (i * 2)) & 3; | |
180 | ||
181 | if (tag != 3) | |
182 | val2 |= (1 << i); | |
183 | } | |
184 | *(unsigned short *) &fp->ftag = val2; | |
185 | ||
186 | collect_register_by_name ("fiseg", &val); | |
187 | val &= 0xFFFF; | |
188 | *(unsigned short *) &fp->fiseg = val; | |
189 | ||
190 | collect_register_by_name ("foseg", &val); | |
191 | val &= 0xFFFF; | |
192 | *(unsigned short *) &fp->foseg = val; | |
193 | } | |
194 | ||
195 | static int | |
196 | i387_ftag (struct i387_fxsave *fp, int regno) | |
197 | { | |
198 | unsigned char *raw = &fp->st_space[regno * 16]; | |
199 | unsigned int exponent; | |
200 | unsigned long fraction[2]; | |
201 | int integer; | |
202 | ||
203 | integer = raw[7] & 0x80; | |
204 | exponent = (((raw[9] & 0x7f) << 8) | raw[8]); | |
205 | fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); | |
206 | fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) | |
207 | | (raw[5] << 8) | raw[4]); | |
208 | ||
209 | if (exponent == 0x7fff) | |
210 | { | |
211 | /* Special. */ | |
212 | return (2); | |
213 | } | |
214 | else if (exponent == 0x0000) | |
215 | { | |
216 | if (fraction[0] == 0x0000 && fraction[1] == 0x0000 && !integer) | |
217 | { | |
218 | /* Zero. */ | |
219 | return (1); | |
220 | } | |
221 | else | |
222 | { | |
223 | /* Special. */ | |
224 | return (2); | |
225 | } | |
226 | } | |
227 | else | |
228 | { | |
229 | if (integer) | |
230 | { | |
231 | /* Valid. */ | |
232 | return (0); | |
233 | } | |
234 | else | |
235 | { | |
236 | /* Special. */ | |
237 | return (2); | |
238 | } | |
239 | } | |
240 | } | |
241 | ||
242 | void | |
243 | i387_fxsave_to_cache (void *buf) | |
244 | { | |
245 | struct i387_fxsave *fp = (struct i387_fxsave *) buf; | |
246 | int i, top; | |
247 | int st0_regnum = find_regno ("st0"); | |
248 | int xmm0_regnum = find_regno ("xmm0"); | |
249 | unsigned long val; | |
250 | ||
251 | for (i = 0; i < 8; i++) | |
252 | supply_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 16); | |
253 | for (i = 0; i < num_xmm_registers; i++) | |
254 | supply_register (i + xmm0_regnum, ((char *) &fp->xmm_space[0]) + i * 16); | |
255 | ||
256 | supply_register_by_name ("fioff", &fp->fioff); | |
257 | supply_register_by_name ("fooff", &fp->fooff); | |
258 | supply_register_by_name ("mxcsr", &fp->mxcsr); | |
259 | ||
260 | /* Some registers are 16-bit. */ | |
261 | val = fp->fctrl & 0xFFFF; | |
262 | supply_register_by_name ("fctrl", &val); | |
263 | ||
264 | val = fp->fstat & 0xFFFF; | |
265 | supply_register_by_name ("fstat", &val); | |
266 | ||
267 | /* Generate the form of ftag data that GDB expects. */ | |
268 | top = (fp->fstat >> 11) & 0x7; | |
269 | val = 0; | |
270 | for (i = 7; i >= 0; i--) | |
271 | { | |
272 | int tag; | |
273 | if (val & (1 << i)) | |
274 | tag = i387_ftag (fp, (i + 8 - top) % 8); | |
275 | else | |
276 | tag = 3; | |
277 | val |= tag << (2 * i); | |
278 | } | |
279 | supply_register_by_name ("ftag", &val); | |
280 | ||
281 | val = fp->fiseg & 0xFFFF; | |
282 | supply_register_by_name ("fiseg", &val); | |
283 | ||
284 | val = fp->foseg & 0xFFFF; | |
285 | supply_register_by_name ("foseg", &val); | |
286 | ||
287 | val = (fp->fop) & 0x7FF; | |
288 | supply_register_by_name ("fop", &val); | |
289 | } | |
290 |