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 2 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, write to the Free Software
18 Foundation, Inc., 51 Franklin Street, Fifth Floor,
19 Boston, MA 02110-1301, USA. */
24 int num_xmm_registers
= 8;
26 /* Note: These functions preserve the reserved bits in control registers.
27 However, gdbserver promptly throws away that information. */
29 /* These structs should have the proper sizes and alignment on both
30 i386 and x86-64 machines. */
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). */
44 /* Space for eight 80-bit FP values. */
45 unsigned char st_space
[80];
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). */
64 /* Space for eight 80-bit FP values in 128-bit spaces. */
65 unsigned char st_space
[128];
67 /* Space for eight 128-bit XMM values, or 16 on x86-64. */
68 unsigned char xmm_space
[256];
72 i387_cache_to_fsave (void *buf
)
74 struct i387_fsave
*fp
= (struct i387_fsave
*) buf
;
76 int st0_regnum
= find_regno ("st0");
77 unsigned long val
, val2
;
79 for (i
= 0; i
< 8; i
++)
80 collect_register (i
+ st0_regnum
, ((char *) &fp
->st_space
[0]) + i
* 10);
82 collect_register_by_name ("fioff", &fp
->fioff
);
83 collect_register_by_name ("fooff", &fp
->fooff
);
85 /* This one's 11 bits... */
86 collect_register_by_name ("fop", &val2
);
87 fp
->fop
= (val2
& 0x7FF) | (fp
->fop
& 0xF800);
89 /* Some registers are 16-bit. */
90 collect_register_by_name ("fctrl", &val
);
91 *(unsigned short *) &fp
->fctrl
= val
;
93 collect_register_by_name ("fstat", &val
);
95 *(unsigned short *) &fp
->fstat
= val
;
97 collect_register_by_name ("ftag", &val
);
99 *(unsigned short *) &fp
->ftag
= val
;
101 collect_register_by_name ("fiseg", &val
);
103 *(unsigned short *) &fp
->fiseg
= val
;
105 collect_register_by_name ("foseg", &val
);
107 *(unsigned short *) &fp
->foseg
= val
;
111 i387_fsave_to_cache (const void *buf
)
113 struct i387_fsave
*fp
= (struct i387_fsave
*) buf
;
115 int st0_regnum
= find_regno ("st0");
118 for (i
= 0; i
< 8; i
++)
119 supply_register (i
+ st0_regnum
, ((char *) &fp
->st_space
[0]) + i
* 10);
121 supply_register_by_name ("fioff", &fp
->fioff
);
122 supply_register_by_name ("fooff", &fp
->fooff
);
124 /* Some registers are 16-bit. */
125 val
= fp
->fctrl
& 0xFFFF;
126 supply_register_by_name ("fctrl", &val
);
128 val
= fp
->fstat
& 0xFFFF;
129 supply_register_by_name ("fstat", &val
);
131 val
= fp
->ftag
& 0xFFFF;
132 supply_register_by_name ("ftag", &val
);
134 val
= fp
->fiseg
& 0xFFFF;
135 supply_register_by_name ("fiseg", &val
);
137 val
= fp
->foseg
& 0xFFFF;
138 supply_register_by_name ("foseg", &val
);
140 val
= (fp
->fop
) & 0x7FF;
141 supply_register_by_name ("fop", &val
);
145 i387_cache_to_fxsave (void *buf
)
147 struct i387_fxsave
*fp
= (struct i387_fxsave
*) buf
;
149 int st0_regnum
= find_regno ("st0");
150 int xmm0_regnum
= find_regno ("xmm0");
151 unsigned long val
, val2
;
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);
158 collect_register_by_name ("fioff", &fp
->fioff
);
159 collect_register_by_name ("fooff", &fp
->fooff
);
160 collect_register_by_name ("mxcsr", &fp
->mxcsr
);
162 /* This one's 11 bits... */
163 collect_register_by_name ("fop", &val2
);
164 fp
->fop
= (val2
& 0x7FF) | (fp
->fop
& 0xF800);
166 /* Some registers are 16-bit. */
167 collect_register_by_name ("fctrl", &val
);
168 *(unsigned short *) &fp
->fctrl
= val
;
170 collect_register_by_name ("fstat", &val
);
172 *(unsigned short *) &fp
->fstat
= val
;
174 /* Convert to the simplifed tag form stored in fxsave data. */
175 collect_register_by_name ("ftag", &val
);
177 for (i
= 7; i
>= 0; i
--)
179 int tag
= (val
>> (i
* 2)) & 3;
184 *(unsigned short *) &fp
->ftag
= val2
;
186 collect_register_by_name ("fiseg", &val
);
188 *(unsigned short *) &fp
->fiseg
= val
;
190 collect_register_by_name ("foseg", &val
);
192 *(unsigned short *) &fp
->foseg
= val
;
196 i387_ftag (struct i387_fxsave
*fp
, int regno
)
198 unsigned char *raw
= &fp
->st_space
[regno
* 16];
199 unsigned int exponent
;
200 unsigned long fraction
[2];
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]);
209 if (exponent
== 0x7fff)
214 else if (exponent
== 0x0000)
216 if (fraction
[0] == 0x0000 && fraction
[1] == 0x0000 && !integer
)
243 i387_fxsave_to_cache (const void *buf
)
245 struct i387_fxsave
*fp
= (struct i387_fxsave
*) buf
;
247 int st0_regnum
= find_regno ("st0");
248 int xmm0_regnum
= find_regno ("xmm0");
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);
256 supply_register_by_name ("fioff", &fp
->fioff
);
257 supply_register_by_name ("fooff", &fp
->fooff
);
258 supply_register_by_name ("mxcsr", &fp
->mxcsr
);
260 /* Some registers are 16-bit. */
261 val
= fp
->fctrl
& 0xFFFF;
262 supply_register_by_name ("fctrl", &val
);
264 val
= fp
->fstat
& 0xFFFF;
265 supply_register_by_name ("fstat", &val
);
267 /* Generate the form of ftag data that GDB expects. */
268 top
= (fp
->fstat
>> 11) & 0x7;
270 for (i
= 7; i
>= 0; i
--)
274 tag
= i387_ftag (fp
, (i
+ 8 - top
) % 8);
277 val
|= tag
<< (2 * i
);
279 supply_register_by_name ("ftag", &val
);
281 val
= fp
->fiseg
& 0xFFFF;
282 supply_register_by_name ("fiseg", &val
);
284 val
= fp
->foseg
& 0xFFFF;
285 supply_register_by_name ("foseg", &val
);
287 val
= (fp
->fop
) & 0x7FF;
288 supply_register_by_name ("fop", &val
);
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