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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" | |
0d62e5e8 | 23 | #include "i387-fp.h" |
58caa3dc DJ |
24 | |
25 | int num_xmm_registers = 8; | |
26 | ||
27 | /* Note: These functions preserve the reserved bits in control registers. | |
28 | However, gdbserver promptly throws away that information. */ | |
29 | ||
30 | /* These structs should have the proper sizes and alignment on both | |
31 | i386 and x86-64 machines. */ | |
32 | ||
33 | struct i387_fsave { | |
34 | /* All these are only sixteen bits, plus padding, except for fop (which | |
35 | is only eleven bits), and fooff / fioff (which are 32 bits each). */ | |
36 | unsigned int fctrl; | |
37 | unsigned int fstat; | |
38 | unsigned int ftag; | |
39 | unsigned int fioff; | |
40 | unsigned short fiseg; | |
41 | unsigned short fop; | |
42 | unsigned int fooff; | |
43 | unsigned int foseg; | |
44 | ||
45 | /* Space for eight 80-bit FP values. */ | |
46 | char st_space[80]; | |
47 | }; | |
48 | ||
49 | struct i387_fxsave { | |
50 | /* All these are only sixteen bits, plus padding, except for fop (which | |
51 | is only eleven bits), and fooff / fioff (which are 32 bits each). */ | |
52 | unsigned short fctrl; | |
53 | unsigned short fstat; | |
54 | unsigned short ftag; | |
55 | unsigned short fop; | |
56 | unsigned int fioff; | |
57 | unsigned int fiseg; | |
58 | unsigned int fooff; | |
59 | unsigned int foseg; | |
60 | ||
61 | unsigned int mxcsr; | |
62 | ||
63 | unsigned int _pad1; | |
64 | ||
65 | /* Space for eight 80-bit FP values in 128-bit spaces. */ | |
66 | char st_space[128]; | |
67 | ||
68 | /* Space for eight 128-bit XMM values, or 16 on x86-64. */ | |
69 | char xmm_space[256]; | |
70 | }; | |
71 | ||
72 | void | |
73 | i387_cache_to_fsave (void *buf) | |
74 | { | |
75 | struct i387_fsave *fp = (struct i387_fsave *) buf; | |
76 | int i; | |
77 | int st0_regnum = find_regno ("st0"); | |
78 | unsigned long val, val2; | |
79 | ||
80 | for (i = 0; i < 8; i++) | |
81 | collect_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 10); | |
82 | ||
83 | collect_register_by_name ("fioff", &fp->fioff); | |
84 | collect_register_by_name ("fooff", &fp->fooff); | |
85 | ||
86 | /* This one's 11 bits... */ | |
87 | collect_register_by_name ("fop", &val2); | |
88 | fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800); | |
89 | ||
90 | /* Some registers are 16-bit. */ | |
91 | collect_register_by_name ("fctrl", &val); | |
92 | *(unsigned short *) &fp->fctrl = val; | |
93 | ||
94 | collect_register_by_name ("fstat", &val); | |
95 | val &= 0xFFFF; | |
96 | *(unsigned short *) &fp->fstat = val; | |
97 | ||
98 | collect_register_by_name ("ftag", &val); | |
99 | val &= 0xFFFF; | |
100 | *(unsigned short *) &fp->ftag = val; | |
101 | ||
102 | collect_register_by_name ("fiseg", &val); | |
103 | val &= 0xFFFF; | |
104 | *(unsigned short *) &fp->fiseg = val; | |
105 | ||
106 | collect_register_by_name ("foseg", &val); | |
107 | val &= 0xFFFF; | |
108 | *(unsigned short *) &fp->foseg = val; | |
109 | } | |
110 | ||
111 | void | |
0d62e5e8 | 112 | i387_fsave_to_cache (const void *buf) |
58caa3dc DJ |
113 | { |
114 | struct i387_fsave *fp = (struct i387_fsave *) buf; | |
115 | int i; | |
116 | int st0_regnum = find_regno ("st0"); | |
117 | unsigned long val; | |
118 | ||
119 | for (i = 0; i < 8; i++) | |
120 | supply_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 10); | |
121 | ||
122 | supply_register_by_name ("fioff", &fp->fioff); | |
123 | supply_register_by_name ("fooff", &fp->fooff); | |
124 | ||
125 | /* Some registers are 16-bit. */ | |
126 | val = fp->fctrl & 0xFFFF; | |
127 | supply_register_by_name ("fctrl", &val); | |
128 | ||
129 | val = fp->fstat & 0xFFFF; | |
130 | supply_register_by_name ("fstat", &val); | |
131 | ||
132 | val = fp->ftag & 0xFFFF; | |
133 | supply_register_by_name ("ftag", &val); | |
134 | ||
135 | val = fp->fiseg & 0xFFFF; | |
136 | supply_register_by_name ("fiseg", &val); | |
137 | ||
138 | val = fp->foseg & 0xFFFF; | |
139 | supply_register_by_name ("foseg", &val); | |
140 | ||
141 | val = (fp->fop) & 0x7FF; | |
142 | supply_register_by_name ("fop", &val); | |
143 | } | |
144 | ||
145 | void | |
146 | i387_cache_to_fxsave (void *buf) | |
147 | { | |
148 | struct i387_fxsave *fp = (struct i387_fxsave *) buf; | |
149 | int i; | |
150 | int st0_regnum = find_regno ("st0"); | |
151 | int xmm0_regnum = find_regno ("xmm0"); | |
152 | unsigned long val, val2; | |
153 | ||
154 | for (i = 0; i < 8; i++) | |
155 | collect_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 16); | |
156 | for (i = 0; i < num_xmm_registers; i++) | |
157 | collect_register (i + xmm0_regnum, ((char *) &fp->xmm_space[0]) + i * 16); | |
158 | ||
159 | collect_register_by_name ("fioff", &fp->fioff); | |
160 | collect_register_by_name ("fooff", &fp->fooff); | |
161 | collect_register_by_name ("mxcsr", &fp->mxcsr); | |
162 | ||
163 | /* This one's 11 bits... */ | |
164 | collect_register_by_name ("fop", &val2); | |
165 | fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800); | |
166 | ||
167 | /* Some registers are 16-bit. */ | |
168 | collect_register_by_name ("fctrl", &val); | |
169 | *(unsigned short *) &fp->fctrl = val; | |
170 | ||
171 | collect_register_by_name ("fstat", &val); | |
172 | val &= 0xFFFF; | |
173 | *(unsigned short *) &fp->fstat = val; | |
174 | ||
175 | /* Convert to the simplifed tag form stored in fxsave data. */ | |
176 | collect_register_by_name ("ftag", &val); | |
177 | val &= 0xFFFF; | |
178 | for (i = 7; i >= 0; i--) | |
179 | { | |
180 | int tag = (val >> (i * 2)) & 3; | |
181 | ||
182 | if (tag != 3) | |
183 | val2 |= (1 << i); | |
184 | } | |
185 | *(unsigned short *) &fp->ftag = val2; | |
186 | ||
187 | collect_register_by_name ("fiseg", &val); | |
188 | val &= 0xFFFF; | |
189 | *(unsigned short *) &fp->fiseg = val; | |
190 | ||
191 | collect_register_by_name ("foseg", &val); | |
192 | val &= 0xFFFF; | |
193 | *(unsigned short *) &fp->foseg = val; | |
194 | } | |
195 | ||
196 | static int | |
197 | i387_ftag (struct i387_fxsave *fp, int regno) | |
198 | { | |
199 | unsigned char *raw = &fp->st_space[regno * 16]; | |
200 | unsigned int exponent; | |
201 | unsigned long fraction[2]; | |
202 | int integer; | |
203 | ||
204 | integer = raw[7] & 0x80; | |
205 | exponent = (((raw[9] & 0x7f) << 8) | raw[8]); | |
206 | fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); | |
207 | fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) | |
208 | | (raw[5] << 8) | raw[4]); | |
209 | ||
210 | if (exponent == 0x7fff) | |
211 | { | |
212 | /* Special. */ | |
213 | return (2); | |
214 | } | |
215 | else if (exponent == 0x0000) | |
216 | { | |
217 | if (fraction[0] == 0x0000 && fraction[1] == 0x0000 && !integer) | |
218 | { | |
219 | /* Zero. */ | |
220 | return (1); | |
221 | } | |
222 | else | |
223 | { | |
224 | /* Special. */ | |
225 | return (2); | |
226 | } | |
227 | } | |
228 | else | |
229 | { | |
230 | if (integer) | |
231 | { | |
232 | /* Valid. */ | |
233 | return (0); | |
234 | } | |
235 | else | |
236 | { | |
237 | /* Special. */ | |
238 | return (2); | |
239 | } | |
240 | } | |
241 | } | |
242 | ||
243 | void | |
0d62e5e8 | 244 | i387_fxsave_to_cache (const void *buf) |
58caa3dc DJ |
245 | { |
246 | struct i387_fxsave *fp = (struct i387_fxsave *) buf; | |
247 | int i, top; | |
248 | int st0_regnum = find_regno ("st0"); | |
249 | int xmm0_regnum = find_regno ("xmm0"); | |
250 | unsigned long val; | |
251 | ||
252 | for (i = 0; i < 8; i++) | |
253 | supply_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 16); | |
254 | for (i = 0; i < num_xmm_registers; i++) | |
255 | supply_register (i + xmm0_regnum, ((char *) &fp->xmm_space[0]) + i * 16); | |
256 | ||
257 | supply_register_by_name ("fioff", &fp->fioff); | |
258 | supply_register_by_name ("fooff", &fp->fooff); | |
259 | supply_register_by_name ("mxcsr", &fp->mxcsr); | |
260 | ||
261 | /* Some registers are 16-bit. */ | |
262 | val = fp->fctrl & 0xFFFF; | |
263 | supply_register_by_name ("fctrl", &val); | |
264 | ||
265 | val = fp->fstat & 0xFFFF; | |
266 | supply_register_by_name ("fstat", &val); | |
267 | ||
268 | /* Generate the form of ftag data that GDB expects. */ | |
269 | top = (fp->fstat >> 11) & 0x7; | |
270 | val = 0; | |
271 | for (i = 7; i >= 0; i--) | |
272 | { | |
273 | int tag; | |
274 | if (val & (1 << i)) | |
275 | tag = i387_ftag (fp, (i + 8 - top) % 8); | |
276 | else | |
277 | tag = 3; | |
278 | val |= tag << (2 * i); | |
279 | } | |
280 | supply_register_by_name ("ftag", &val); | |
281 | ||
282 | val = fp->fiseg & 0xFFFF; | |
283 | supply_register_by_name ("fiseg", &val); | |
284 | ||
285 | val = fp->foseg & 0xFFFF; | |
286 | supply_register_by_name ("foseg", &val); | |
287 | ||
288 | val = (fp->fop) & 0x7FF; | |
289 | supply_register_by_name ("fop", &val); | |
290 | } |