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58caa3dc | 1 | /* i387-specific utility functions, for the remote server for GDB. |
6aba47ca | 2 | Copyright (C) 2000, 2001, 2002, 2005, 2007 Free Software Foundation, Inc. |
58caa3dc DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
6f0f660e EZ |
18 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
19 | Boston, MA 02110-1301, USA. */ | |
58caa3dc DJ |
20 | |
21 | #include "server.h" | |
0d62e5e8 | 22 | #include "i387-fp.h" |
58caa3dc DJ |
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). */ | |
0c2ead7e DJ |
35 | unsigned short fctrl; |
36 | unsigned short pad1; | |
37 | unsigned short fstat; | |
38 | unsigned short pad2; | |
39 | unsigned short ftag; | |
40 | unsigned short pad3; | |
58caa3dc DJ |
41 | unsigned int fioff; |
42 | unsigned short fiseg; | |
43 | unsigned short fop; | |
44 | unsigned int fooff; | |
0c2ead7e DJ |
45 | unsigned short foseg; |
46 | unsigned short pad4; | |
58caa3dc DJ |
47 | |
48 | /* Space for eight 80-bit FP values. */ | |
f450004a | 49 | unsigned char st_space[80]; |
58caa3dc DJ |
50 | }; |
51 | ||
52 | struct i387_fxsave { | |
53 | /* All these are only sixteen bits, plus padding, except for fop (which | |
54 | is only eleven bits), and fooff / fioff (which are 32 bits each). */ | |
55 | unsigned short fctrl; | |
56 | unsigned short fstat; | |
57 | unsigned short ftag; | |
58 | unsigned short fop; | |
59 | unsigned int fioff; | |
0c2ead7e DJ |
60 | unsigned short fiseg; |
61 | unsigned short pad1; | |
58caa3dc | 62 | unsigned int fooff; |
0c2ead7e DJ |
63 | unsigned short foseg; |
64 | unsigned short pad12; | |
58caa3dc DJ |
65 | |
66 | unsigned int mxcsr; | |
0c2ead7e | 67 | unsigned int pad3; |
58caa3dc DJ |
68 | |
69 | /* Space for eight 80-bit FP values in 128-bit spaces. */ | |
f450004a | 70 | unsigned char st_space[128]; |
58caa3dc DJ |
71 | |
72 | /* Space for eight 128-bit XMM values, or 16 on x86-64. */ | |
f450004a | 73 | unsigned char xmm_space[256]; |
58caa3dc DJ |
74 | }; |
75 | ||
76 | void | |
77 | i387_cache_to_fsave (void *buf) | |
78 | { | |
79 | struct i387_fsave *fp = (struct i387_fsave *) buf; | |
80 | int i; | |
81 | int st0_regnum = find_regno ("st0"); | |
82 | unsigned long val, val2; | |
83 | ||
84 | for (i = 0; i < 8; i++) | |
85 | collect_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 10); | |
86 | ||
87 | collect_register_by_name ("fioff", &fp->fioff); | |
88 | collect_register_by_name ("fooff", &fp->fooff); | |
89 | ||
90 | /* This one's 11 bits... */ | |
91 | collect_register_by_name ("fop", &val2); | |
92 | fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800); | |
93 | ||
94 | /* Some registers are 16-bit. */ | |
95 | collect_register_by_name ("fctrl", &val); | |
0c2ead7e | 96 | fp->fctrl = val; |
58caa3dc DJ |
97 | |
98 | collect_register_by_name ("fstat", &val); | |
99 | val &= 0xFFFF; | |
0c2ead7e | 100 | fp->fstat = val; |
58caa3dc DJ |
101 | |
102 | collect_register_by_name ("ftag", &val); | |
103 | val &= 0xFFFF; | |
0c2ead7e | 104 | fp->ftag = val; |
58caa3dc DJ |
105 | |
106 | collect_register_by_name ("fiseg", &val); | |
107 | val &= 0xFFFF; | |
0c2ead7e | 108 | fp->fiseg = val; |
58caa3dc DJ |
109 | |
110 | collect_register_by_name ("foseg", &val); | |
111 | val &= 0xFFFF; | |
0c2ead7e | 112 | fp->foseg = val; |
58caa3dc DJ |
113 | } |
114 | ||
115 | void | |
0d62e5e8 | 116 | i387_fsave_to_cache (const void *buf) |
58caa3dc DJ |
117 | { |
118 | struct i387_fsave *fp = (struct i387_fsave *) buf; | |
119 | int i; | |
120 | int st0_regnum = find_regno ("st0"); | |
121 | unsigned long val; | |
122 | ||
123 | for (i = 0; i < 8; i++) | |
124 | supply_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 10); | |
125 | ||
126 | supply_register_by_name ("fioff", &fp->fioff); | |
127 | supply_register_by_name ("fooff", &fp->fooff); | |
128 | ||
129 | /* Some registers are 16-bit. */ | |
130 | val = fp->fctrl & 0xFFFF; | |
131 | supply_register_by_name ("fctrl", &val); | |
132 | ||
133 | val = fp->fstat & 0xFFFF; | |
134 | supply_register_by_name ("fstat", &val); | |
135 | ||
136 | val = fp->ftag & 0xFFFF; | |
137 | supply_register_by_name ("ftag", &val); | |
138 | ||
139 | val = fp->fiseg & 0xFFFF; | |
140 | supply_register_by_name ("fiseg", &val); | |
141 | ||
142 | val = fp->foseg & 0xFFFF; | |
143 | supply_register_by_name ("foseg", &val); | |
144 | ||
0c2ead7e | 145 | /* fop has only 11 valid bits. */ |
58caa3dc DJ |
146 | val = (fp->fop) & 0x7FF; |
147 | supply_register_by_name ("fop", &val); | |
148 | } | |
149 | ||
150 | void | |
151 | i387_cache_to_fxsave (void *buf) | |
152 | { | |
153 | struct i387_fxsave *fp = (struct i387_fxsave *) buf; | |
154 | int i; | |
155 | int st0_regnum = find_regno ("st0"); | |
156 | int xmm0_regnum = find_regno ("xmm0"); | |
157 | unsigned long val, val2; | |
158 | ||
159 | for (i = 0; i < 8; i++) | |
160 | collect_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 16); | |
161 | for (i = 0; i < num_xmm_registers; i++) | |
162 | collect_register (i + xmm0_regnum, ((char *) &fp->xmm_space[0]) + i * 16); | |
163 | ||
164 | collect_register_by_name ("fioff", &fp->fioff); | |
165 | collect_register_by_name ("fooff", &fp->fooff); | |
166 | collect_register_by_name ("mxcsr", &fp->mxcsr); | |
167 | ||
168 | /* This one's 11 bits... */ | |
169 | collect_register_by_name ("fop", &val2); | |
170 | fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800); | |
171 | ||
172 | /* Some registers are 16-bit. */ | |
173 | collect_register_by_name ("fctrl", &val); | |
0c2ead7e | 174 | fp->fctrl = val; |
58caa3dc DJ |
175 | |
176 | collect_register_by_name ("fstat", &val); | |
0c2ead7e | 177 | fp->fstat = val; |
58caa3dc DJ |
178 | |
179 | /* Convert to the simplifed tag form stored in fxsave data. */ | |
180 | collect_register_by_name ("ftag", &val); | |
181 | val &= 0xFFFF; | |
73725ff3 | 182 | val2 = 0; |
58caa3dc DJ |
183 | for (i = 7; i >= 0; i--) |
184 | { | |
185 | int tag = (val >> (i * 2)) & 3; | |
186 | ||
187 | if (tag != 3) | |
188 | val2 |= (1 << i); | |
189 | } | |
0c2ead7e | 190 | fp->ftag = val2; |
58caa3dc DJ |
191 | |
192 | collect_register_by_name ("fiseg", &val); | |
0c2ead7e | 193 | fp->fiseg = val; |
58caa3dc DJ |
194 | |
195 | collect_register_by_name ("foseg", &val); | |
0c2ead7e | 196 | fp->foseg = val; |
58caa3dc DJ |
197 | } |
198 | ||
199 | static int | |
200 | i387_ftag (struct i387_fxsave *fp, int regno) | |
201 | { | |
202 | unsigned char *raw = &fp->st_space[regno * 16]; | |
203 | unsigned int exponent; | |
204 | unsigned long fraction[2]; | |
205 | int integer; | |
206 | ||
207 | integer = raw[7] & 0x80; | |
208 | exponent = (((raw[9] & 0x7f) << 8) | raw[8]); | |
209 | fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); | |
210 | fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) | |
211 | | (raw[5] << 8) | raw[4]); | |
212 | ||
213 | if (exponent == 0x7fff) | |
214 | { | |
215 | /* Special. */ | |
216 | return (2); | |
217 | } | |
218 | else if (exponent == 0x0000) | |
219 | { | |
220 | if (fraction[0] == 0x0000 && fraction[1] == 0x0000 && !integer) | |
221 | { | |
222 | /* Zero. */ | |
223 | return (1); | |
224 | } | |
225 | else | |
226 | { | |
227 | /* Special. */ | |
228 | return (2); | |
229 | } | |
230 | } | |
231 | else | |
232 | { | |
233 | if (integer) | |
234 | { | |
235 | /* Valid. */ | |
236 | return (0); | |
237 | } | |
238 | else | |
239 | { | |
240 | /* Special. */ | |
241 | return (2); | |
242 | } | |
243 | } | |
244 | } | |
245 | ||
246 | void | |
0d62e5e8 | 247 | i387_fxsave_to_cache (const void *buf) |
58caa3dc DJ |
248 | { |
249 | struct i387_fxsave *fp = (struct i387_fxsave *) buf; | |
250 | int i, top; | |
251 | int st0_regnum = find_regno ("st0"); | |
252 | int xmm0_regnum = find_regno ("xmm0"); | |
253 | unsigned long val; | |
254 | ||
255 | for (i = 0; i < 8; i++) | |
256 | supply_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 16); | |
257 | for (i = 0; i < num_xmm_registers; i++) | |
258 | supply_register (i + xmm0_regnum, ((char *) &fp->xmm_space[0]) + i * 16); | |
259 | ||
260 | supply_register_by_name ("fioff", &fp->fioff); | |
261 | supply_register_by_name ("fooff", &fp->fooff); | |
262 | supply_register_by_name ("mxcsr", &fp->mxcsr); | |
263 | ||
264 | /* Some registers are 16-bit. */ | |
265 | val = fp->fctrl & 0xFFFF; | |
266 | supply_register_by_name ("fctrl", &val); | |
267 | ||
268 | val = fp->fstat & 0xFFFF; | |
269 | supply_register_by_name ("fstat", &val); | |
270 | ||
271 | /* Generate the form of ftag data that GDB expects. */ | |
272 | top = (fp->fstat >> 11) & 0x7; | |
273 | val = 0; | |
274 | for (i = 7; i >= 0; i--) | |
275 | { | |
276 | int tag; | |
73725ff3 | 277 | if (fp->ftag & (1 << i)) |
58caa3dc DJ |
278 | tag = i387_ftag (fp, (i + 8 - top) % 8); |
279 | else | |
280 | tag = 3; | |
281 | val |= tag << (2 * i); | |
282 | } | |
283 | supply_register_by_name ("ftag", &val); | |
284 | ||
285 | val = fp->fiseg & 0xFFFF; | |
286 | supply_register_by_name ("fiseg", &val); | |
287 | ||
288 | val = fp->foseg & 0xFFFF; | |
289 | supply_register_by_name ("foseg", &val); | |
290 | ||
291 | val = (fp->fop) & 0x7FF; | |
292 | supply_register_by_name ("fop", &val); | |
293 | } |