1 /* i387-specific utility functions, for the remote server for GDB.
2 Copyright (C) 2000, 2001, 2002, 2005, 2007 Free Software Foundation, Inc.
4 This file is part of GDB.
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 3 of the License, or
9 (at your option) any later version.
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.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 int num_xmm_registers
= 8;
24 /* Note: These functions preserve the reserved bits in control registers.
25 However, gdbserver promptly throws away that information. */
27 /* These structs should have the proper sizes and alignment on both
28 i386 and x86-64 machines. */
31 /* All these are only sixteen bits, plus padding, except for fop (which
32 is only eleven bits), and fooff / fioff (which are 32 bits each). */
46 /* Space for eight 80-bit FP values. */
47 unsigned char st_space
[80];
51 /* All these are only sixteen bits, plus padding, except for fop (which
52 is only eleven bits), and fooff / fioff (which are 32 bits each). */
67 /* Space for eight 80-bit FP values in 128-bit spaces. */
68 unsigned char st_space
[128];
70 /* Space for eight 128-bit XMM values, or 16 on x86-64. */
71 unsigned char xmm_space
[256];
75 i387_cache_to_fsave (void *buf
)
77 struct i387_fsave
*fp
= (struct i387_fsave
*) buf
;
79 int st0_regnum
= find_regno ("st0");
80 unsigned long val
, val2
;
82 for (i
= 0; i
< 8; i
++)
83 collect_register (i
+ st0_regnum
, ((char *) &fp
->st_space
[0]) + i
* 10);
85 collect_register_by_name ("fioff", &fp
->fioff
);
86 collect_register_by_name ("fooff", &fp
->fooff
);
88 /* This one's 11 bits... */
89 collect_register_by_name ("fop", &val2
);
90 fp
->fop
= (val2
& 0x7FF) | (fp
->fop
& 0xF800);
92 /* Some registers are 16-bit. */
93 collect_register_by_name ("fctrl", &val
);
96 collect_register_by_name ("fstat", &val
);
100 collect_register_by_name ("ftag", &val
);
104 collect_register_by_name ("fiseg", &val
);
108 collect_register_by_name ("foseg", &val
);
114 i387_fsave_to_cache (const void *buf
)
116 struct i387_fsave
*fp
= (struct i387_fsave
*) buf
;
118 int st0_regnum
= find_regno ("st0");
121 for (i
= 0; i
< 8; i
++)
122 supply_register (i
+ st0_regnum
, ((char *) &fp
->st_space
[0]) + i
* 10);
124 supply_register_by_name ("fioff", &fp
->fioff
);
125 supply_register_by_name ("fooff", &fp
->fooff
);
127 /* Some registers are 16-bit. */
128 val
= fp
->fctrl
& 0xFFFF;
129 supply_register_by_name ("fctrl", &val
);
131 val
= fp
->fstat
& 0xFFFF;
132 supply_register_by_name ("fstat", &val
);
134 val
= fp
->ftag
& 0xFFFF;
135 supply_register_by_name ("ftag", &val
);
137 val
= fp
->fiseg
& 0xFFFF;
138 supply_register_by_name ("fiseg", &val
);
140 val
= fp
->foseg
& 0xFFFF;
141 supply_register_by_name ("foseg", &val
);
143 /* fop has only 11 valid bits. */
144 val
= (fp
->fop
) & 0x7FF;
145 supply_register_by_name ("fop", &val
);
149 i387_cache_to_fxsave (void *buf
)
151 struct i387_fxsave
*fp
= (struct i387_fxsave
*) buf
;
153 int st0_regnum
= find_regno ("st0");
154 int xmm0_regnum
= find_regno ("xmm0");
155 unsigned long val
, val2
;
157 for (i
= 0; i
< 8; i
++)
158 collect_register (i
+ st0_regnum
, ((char *) &fp
->st_space
[0]) + i
* 16);
159 for (i
= 0; i
< num_xmm_registers
; i
++)
160 collect_register (i
+ xmm0_regnum
, ((char *) &fp
->xmm_space
[0]) + i
* 16);
162 collect_register_by_name ("fioff", &fp
->fioff
);
163 collect_register_by_name ("fooff", &fp
->fooff
);
164 collect_register_by_name ("mxcsr", &fp
->mxcsr
);
166 /* This one's 11 bits... */
167 collect_register_by_name ("fop", &val2
);
168 fp
->fop
= (val2
& 0x7FF) | (fp
->fop
& 0xF800);
170 /* Some registers are 16-bit. */
171 collect_register_by_name ("fctrl", &val
);
174 collect_register_by_name ("fstat", &val
);
177 /* Convert to the simplifed tag form stored in fxsave data. */
178 collect_register_by_name ("ftag", &val
);
181 for (i
= 7; i
>= 0; i
--)
183 int tag
= (val
>> (i
* 2)) & 3;
190 collect_register_by_name ("fiseg", &val
);
193 collect_register_by_name ("foseg", &val
);
198 i387_ftag (struct i387_fxsave
*fp
, int regno
)
200 unsigned char *raw
= &fp
->st_space
[regno
* 16];
201 unsigned int exponent
;
202 unsigned long fraction
[2];
205 integer
= raw
[7] & 0x80;
206 exponent
= (((raw
[9] & 0x7f) << 8) | raw
[8]);
207 fraction
[0] = ((raw
[3] << 24) | (raw
[2] << 16) | (raw
[1] << 8) | raw
[0]);
208 fraction
[1] = (((raw
[7] & 0x7f) << 24) | (raw
[6] << 16)
209 | (raw
[5] << 8) | raw
[4]);
211 if (exponent
== 0x7fff)
216 else if (exponent
== 0x0000)
218 if (fraction
[0] == 0x0000 && fraction
[1] == 0x0000 && !integer
)
245 i387_fxsave_to_cache (const void *buf
)
247 struct i387_fxsave
*fp
= (struct i387_fxsave
*) buf
;
249 int st0_regnum
= find_regno ("st0");
250 int xmm0_regnum
= find_regno ("xmm0");
253 for (i
= 0; i
< 8; i
++)
254 supply_register (i
+ st0_regnum
, ((char *) &fp
->st_space
[0]) + i
* 16);
255 for (i
= 0; i
< num_xmm_registers
; i
++)
256 supply_register (i
+ xmm0_regnum
, ((char *) &fp
->xmm_space
[0]) + i
* 16);
258 supply_register_by_name ("fioff", &fp
->fioff
);
259 supply_register_by_name ("fooff", &fp
->fooff
);
260 supply_register_by_name ("mxcsr", &fp
->mxcsr
);
262 /* Some registers are 16-bit. */
263 val
= fp
->fctrl
& 0xFFFF;
264 supply_register_by_name ("fctrl", &val
);
266 val
= fp
->fstat
& 0xFFFF;
267 supply_register_by_name ("fstat", &val
);
269 /* Generate the form of ftag data that GDB expects. */
270 top
= (fp
->fstat
>> 11) & 0x7;
272 for (i
= 7; i
>= 0; i
--)
275 if (fp
->ftag
& (1 << i
))
276 tag
= i387_ftag (fp
, (i
+ 8 - top
) % 8);
279 val
|= tag
<< (2 * i
);
281 supply_register_by_name ("ftag", &val
);
283 val
= fp
->fiseg
& 0xFFFF;
284 supply_register_by_name ("fiseg", &val
);
286 val
= fp
->foseg
& 0xFFFF;
287 supply_register_by_name ("foseg", &val
);
289 val
= (fp
->fop
) & 0x7FF;
290 supply_register_by_name ("fop", &val
);
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