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58caa3dc | 1 | /* i387-specific utility functions, for the remote server for GDB. |
0fb0cc75 | 2 | Copyright (C) 2000, 2001, 2002, 2005, 2007, 2008, 2009 |
9b254dd1 | 3 | Free Software Foundation, Inc. |
58caa3dc DJ |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
58caa3dc DJ |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
58caa3dc DJ |
19 | |
20 | #include "server.h" | |
0d62e5e8 | 21 | #include "i387-fp.h" |
58caa3dc DJ |
22 | |
23 | int num_xmm_registers = 8; | |
24 | ||
25 | /* Note: These functions preserve the reserved bits in control registers. | |
26 | However, gdbserver promptly throws away that information. */ | |
27 | ||
28 | /* These structs should have the proper sizes and alignment on both | |
29 | i386 and x86-64 machines. */ | |
30 | ||
31 | struct i387_fsave { | |
32 | /* All these are only sixteen bits, plus padding, except for fop (which | |
33 | is only eleven bits), and fooff / fioff (which are 32 bits each). */ | |
0c2ead7e DJ |
34 | unsigned short fctrl; |
35 | unsigned short pad1; | |
36 | unsigned short fstat; | |
37 | unsigned short pad2; | |
38 | unsigned short ftag; | |
39 | unsigned short pad3; | |
58caa3dc DJ |
40 | unsigned int fioff; |
41 | unsigned short fiseg; | |
42 | unsigned short fop; | |
43 | unsigned int fooff; | |
0c2ead7e DJ |
44 | unsigned short foseg; |
45 | unsigned short pad4; | |
58caa3dc DJ |
46 | |
47 | /* Space for eight 80-bit FP values. */ | |
f450004a | 48 | unsigned char st_space[80]; |
58caa3dc DJ |
49 | }; |
50 | ||
51 | struct i387_fxsave { | |
52 | /* All these are only sixteen bits, plus padding, except for fop (which | |
53 | is only eleven bits), and fooff / fioff (which are 32 bits each). */ | |
54 | unsigned short fctrl; | |
55 | unsigned short fstat; | |
56 | unsigned short ftag; | |
57 | unsigned short fop; | |
58 | unsigned int fioff; | |
0c2ead7e DJ |
59 | unsigned short fiseg; |
60 | unsigned short pad1; | |
58caa3dc | 61 | unsigned int fooff; |
0c2ead7e DJ |
62 | unsigned short foseg; |
63 | unsigned short pad12; | |
58caa3dc DJ |
64 | |
65 | unsigned int mxcsr; | |
0c2ead7e | 66 | unsigned int pad3; |
58caa3dc DJ |
67 | |
68 | /* Space for eight 80-bit FP values in 128-bit spaces. */ | |
f450004a | 69 | unsigned char st_space[128]; |
58caa3dc DJ |
70 | |
71 | /* Space for eight 128-bit XMM values, or 16 on x86-64. */ | |
f450004a | 72 | unsigned char xmm_space[256]; |
58caa3dc DJ |
73 | }; |
74 | ||
75 | void | |
76 | i387_cache_to_fsave (void *buf) | |
77 | { | |
78 | struct i387_fsave *fp = (struct i387_fsave *) buf; | |
79 | int i; | |
80 | int st0_regnum = find_regno ("st0"); | |
81 | unsigned long val, val2; | |
82 | ||
83 | for (i = 0; i < 8; i++) | |
84 | collect_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 10); | |
85 | ||
86 | collect_register_by_name ("fioff", &fp->fioff); | |
87 | collect_register_by_name ("fooff", &fp->fooff); | |
88 | ||
89 | /* This one's 11 bits... */ | |
90 | collect_register_by_name ("fop", &val2); | |
91 | fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800); | |
92 | ||
93 | /* Some registers are 16-bit. */ | |
94 | collect_register_by_name ("fctrl", &val); | |
0c2ead7e | 95 | fp->fctrl = val; |
58caa3dc DJ |
96 | |
97 | collect_register_by_name ("fstat", &val); | |
98 | val &= 0xFFFF; | |
0c2ead7e | 99 | fp->fstat = val; |
58caa3dc DJ |
100 | |
101 | collect_register_by_name ("ftag", &val); | |
102 | val &= 0xFFFF; | |
0c2ead7e | 103 | fp->ftag = val; |
58caa3dc DJ |
104 | |
105 | collect_register_by_name ("fiseg", &val); | |
106 | val &= 0xFFFF; | |
0c2ead7e | 107 | fp->fiseg = val; |
58caa3dc DJ |
108 | |
109 | collect_register_by_name ("foseg", &val); | |
110 | val &= 0xFFFF; | |
0c2ead7e | 111 | fp->foseg = val; |
58caa3dc DJ |
112 | } |
113 | ||
114 | void | |
0d62e5e8 | 115 | i387_fsave_to_cache (const void *buf) |
58caa3dc DJ |
116 | { |
117 | struct i387_fsave *fp = (struct i387_fsave *) buf; | |
118 | int i; | |
119 | int st0_regnum = find_regno ("st0"); | |
120 | unsigned long val; | |
121 | ||
122 | for (i = 0; i < 8; i++) | |
123 | supply_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 10); | |
124 | ||
125 | supply_register_by_name ("fioff", &fp->fioff); | |
126 | supply_register_by_name ("fooff", &fp->fooff); | |
127 | ||
128 | /* Some registers are 16-bit. */ | |
129 | val = fp->fctrl & 0xFFFF; | |
130 | supply_register_by_name ("fctrl", &val); | |
131 | ||
132 | val = fp->fstat & 0xFFFF; | |
133 | supply_register_by_name ("fstat", &val); | |
134 | ||
135 | val = fp->ftag & 0xFFFF; | |
136 | supply_register_by_name ("ftag", &val); | |
137 | ||
138 | val = fp->fiseg & 0xFFFF; | |
139 | supply_register_by_name ("fiseg", &val); | |
140 | ||
141 | val = fp->foseg & 0xFFFF; | |
142 | supply_register_by_name ("foseg", &val); | |
143 | ||
0c2ead7e | 144 | /* fop has only 11 valid bits. */ |
58caa3dc DJ |
145 | val = (fp->fop) & 0x7FF; |
146 | supply_register_by_name ("fop", &val); | |
147 | } | |
148 | ||
149 | void | |
150 | i387_cache_to_fxsave (void *buf) | |
151 | { | |
152 | struct i387_fxsave *fp = (struct i387_fxsave *) buf; | |
153 | int i; | |
154 | int st0_regnum = find_regno ("st0"); | |
155 | int xmm0_regnum = find_regno ("xmm0"); | |
156 | unsigned long val, val2; | |
157 | ||
158 | for (i = 0; i < 8; i++) | |
159 | collect_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 16); | |
160 | for (i = 0; i < num_xmm_registers; i++) | |
161 | collect_register (i + xmm0_regnum, ((char *) &fp->xmm_space[0]) + i * 16); | |
162 | ||
163 | collect_register_by_name ("fioff", &fp->fioff); | |
164 | collect_register_by_name ("fooff", &fp->fooff); | |
165 | collect_register_by_name ("mxcsr", &fp->mxcsr); | |
166 | ||
167 | /* This one's 11 bits... */ | |
168 | collect_register_by_name ("fop", &val2); | |
169 | fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800); | |
170 | ||
171 | /* Some registers are 16-bit. */ | |
172 | collect_register_by_name ("fctrl", &val); | |
0c2ead7e | 173 | fp->fctrl = val; |
58caa3dc DJ |
174 | |
175 | collect_register_by_name ("fstat", &val); | |
0c2ead7e | 176 | fp->fstat = val; |
58caa3dc DJ |
177 | |
178 | /* Convert to the simplifed tag form stored in fxsave data. */ | |
179 | collect_register_by_name ("ftag", &val); | |
180 | val &= 0xFFFF; | |
73725ff3 | 181 | val2 = 0; |
58caa3dc DJ |
182 | for (i = 7; i >= 0; i--) |
183 | { | |
184 | int tag = (val >> (i * 2)) & 3; | |
185 | ||
186 | if (tag != 3) | |
187 | val2 |= (1 << i); | |
188 | } | |
0c2ead7e | 189 | fp->ftag = val2; |
58caa3dc DJ |
190 | |
191 | collect_register_by_name ("fiseg", &val); | |
0c2ead7e | 192 | fp->fiseg = val; |
58caa3dc DJ |
193 | |
194 | collect_register_by_name ("foseg", &val); | |
0c2ead7e | 195 | fp->foseg = val; |
58caa3dc DJ |
196 | } |
197 | ||
198 | static int | |
199 | i387_ftag (struct i387_fxsave *fp, int regno) | |
200 | { | |
201 | unsigned char *raw = &fp->st_space[regno * 16]; | |
202 | unsigned int exponent; | |
203 | unsigned long fraction[2]; | |
204 | int integer; | |
205 | ||
206 | integer = raw[7] & 0x80; | |
207 | exponent = (((raw[9] & 0x7f) << 8) | raw[8]); | |
208 | fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); | |
209 | fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) | |
210 | | (raw[5] << 8) | raw[4]); | |
211 | ||
212 | if (exponent == 0x7fff) | |
213 | { | |
214 | /* Special. */ | |
215 | return (2); | |
216 | } | |
217 | else if (exponent == 0x0000) | |
218 | { | |
219 | if (fraction[0] == 0x0000 && fraction[1] == 0x0000 && !integer) | |
220 | { | |
221 | /* Zero. */ | |
222 | return (1); | |
223 | } | |
224 | else | |
225 | { | |
226 | /* Special. */ | |
227 | return (2); | |
228 | } | |
229 | } | |
230 | else | |
231 | { | |
232 | if (integer) | |
233 | { | |
234 | /* Valid. */ | |
235 | return (0); | |
236 | } | |
237 | else | |
238 | { | |
239 | /* Special. */ | |
240 | return (2); | |
241 | } | |
242 | } | |
243 | } | |
244 | ||
245 | void | |
0d62e5e8 | 246 | i387_fxsave_to_cache (const void *buf) |
58caa3dc DJ |
247 | { |
248 | struct i387_fxsave *fp = (struct i387_fxsave *) buf; | |
249 | int i, top; | |
250 | int st0_regnum = find_regno ("st0"); | |
251 | int xmm0_regnum = find_regno ("xmm0"); | |
252 | unsigned long val; | |
253 | ||
254 | for (i = 0; i < 8; i++) | |
255 | supply_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 16); | |
256 | for (i = 0; i < num_xmm_registers; i++) | |
257 | supply_register (i + xmm0_regnum, ((char *) &fp->xmm_space[0]) + i * 16); | |
258 | ||
259 | supply_register_by_name ("fioff", &fp->fioff); | |
260 | supply_register_by_name ("fooff", &fp->fooff); | |
261 | supply_register_by_name ("mxcsr", &fp->mxcsr); | |
262 | ||
263 | /* Some registers are 16-bit. */ | |
264 | val = fp->fctrl & 0xFFFF; | |
265 | supply_register_by_name ("fctrl", &val); | |
266 | ||
267 | val = fp->fstat & 0xFFFF; | |
268 | supply_register_by_name ("fstat", &val); | |
269 | ||
270 | /* Generate the form of ftag data that GDB expects. */ | |
271 | top = (fp->fstat >> 11) & 0x7; | |
272 | val = 0; | |
273 | for (i = 7; i >= 0; i--) | |
274 | { | |
275 | int tag; | |
73725ff3 | 276 | if (fp->ftag & (1 << i)) |
58caa3dc DJ |
277 | tag = i387_ftag (fp, (i + 8 - top) % 8); |
278 | else | |
279 | tag = 3; | |
280 | val |= tag << (2 * i); | |
281 | } | |
282 | supply_register_by_name ("ftag", &val); | |
283 | ||
284 | val = fp->fiseg & 0xFFFF; | |
285 | supply_register_by_name ("fiseg", &val); | |
286 | ||
287 | val = fp->foseg & 0xFFFF; | |
288 | supply_register_by_name ("foseg", &val); | |
289 | ||
290 | val = (fp->fop) & 0x7FF; | |
291 | supply_register_by_name ("fop", &val); | |
292 | } |