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[deliverable/binutils-gdb.git] / gdb / gdbserver / i387-fp.c
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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
24int 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
32struct 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
48struct 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
71void
72i387_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
110void
111i387_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
144void
145i387_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
195static int
196i387_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
242void
243i387_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
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