7ef4ba3b7a1e6487ac5eb95a114f5591b64824c8
1 /* i387-specific utility functions, for the remote server for GDB.
2 Copyright (C) 2000, 2001, 2002, 2005, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
5 This file is part of GDB.
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 3 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 int num_xmm_registers
= 8;
25 /* Note: These functions preserve the reserved bits in control registers.
26 However, gdbserver promptly throws away that information. */
28 /* These structs should have the proper sizes and alignment on both
29 i386 and x86-64 machines. */
32 /* All these are only sixteen bits, plus padding, except for fop (which
33 is only eleven bits), and fooff / fioff (which are 32 bits each). */
47 /* Space for eight 80-bit FP values. */
48 unsigned char st_space
[80];
52 /* All these are only sixteen bits, plus padding, except for fop (which
53 is only eleven bits), and fooff / fioff (which are 32 bits each). */
68 /* Space for eight 80-bit FP values in 128-bit spaces. */
69 unsigned char st_space
[128];
71 /* Space for eight 128-bit XMM values, or 16 on x86-64. */
72 unsigned char xmm_space
[256];
76 i387_cache_to_fsave (struct regcache
*regcache
, void *buf
)
78 struct i387_fsave
*fp
= (struct i387_fsave
*) buf
;
80 int st0_regnum
= find_regno ("st0");
81 unsigned long val
, val2
;
83 for (i
= 0; i
< 8; i
++)
84 collect_register (regcache
, i
+ st0_regnum
,
85 ((char *) &fp
->st_space
[0]) + i
* 10);
87 collect_register_by_name (regcache
, "fioff", &fp
->fioff
);
88 collect_register_by_name (regcache
, "fooff", &fp
->fooff
);
90 /* This one's 11 bits... */
91 collect_register_by_name (regcache
, "fop", &val2
);
92 fp
->fop
= (val2
& 0x7FF) | (fp
->fop
& 0xF800);
94 /* Some registers are 16-bit. */
95 collect_register_by_name (regcache
, "fctrl", &val
);
98 collect_register_by_name (regcache
, "fstat", &val
);
102 collect_register_by_name (regcache
, "ftag", &val
);
106 collect_register_by_name (regcache
, "fiseg", &val
);
110 collect_register_by_name (regcache
, "foseg", &val
);
116 i387_fsave_to_cache (struct regcache
*regcache
, const void *buf
)
118 struct i387_fsave
*fp
= (struct i387_fsave
*) buf
;
120 int st0_regnum
= find_regno ("st0");
123 for (i
= 0; i
< 8; i
++)
124 supply_register (regcache
, i
+ st0_regnum
,
125 ((char *) &fp
->st_space
[0]) + i
* 10);
127 supply_register_by_name (regcache
, "fioff", &fp
->fioff
);
128 supply_register_by_name (regcache
, "fooff", &fp
->fooff
);
130 /* Some registers are 16-bit. */
131 val
= fp
->fctrl
& 0xFFFF;
132 supply_register_by_name (regcache
, "fctrl", &val
);
134 val
= fp
->fstat
& 0xFFFF;
135 supply_register_by_name (regcache
, "fstat", &val
);
137 val
= fp
->ftag
& 0xFFFF;
138 supply_register_by_name (regcache
, "ftag", &val
);
140 val
= fp
->fiseg
& 0xFFFF;
141 supply_register_by_name (regcache
, "fiseg", &val
);
143 val
= fp
->foseg
& 0xFFFF;
144 supply_register_by_name (regcache
, "foseg", &val
);
146 /* fop has only 11 valid bits. */
147 val
= (fp
->fop
) & 0x7FF;
148 supply_register_by_name (regcache
, "fop", &val
);
152 i387_cache_to_fxsave (struct regcache
*regcache
, void *buf
)
154 struct i387_fxsave
*fp
= (struct i387_fxsave
*) buf
;
156 int st0_regnum
= find_regno ("st0");
157 int xmm0_regnum
= find_regno ("xmm0");
158 unsigned long val
, val2
;
160 for (i
= 0; i
< 8; i
++)
161 collect_register (regcache
, i
+ st0_regnum
,
162 ((char *) &fp
->st_space
[0]) + i
* 16);
163 for (i
= 0; i
< num_xmm_registers
; i
++)
164 collect_register (regcache
, i
+ xmm0_regnum
,
165 ((char *) &fp
->xmm_space
[0]) + i
* 16);
167 collect_register_by_name (regcache
, "fioff", &fp
->fioff
);
168 collect_register_by_name (regcache
, "fooff", &fp
->fooff
);
169 collect_register_by_name (regcache
, "mxcsr", &fp
->mxcsr
);
171 /* This one's 11 bits... */
172 collect_register_by_name (regcache
, "fop", &val2
);
173 fp
->fop
= (val2
& 0x7FF) | (fp
->fop
& 0xF800);
175 /* Some registers are 16-bit. */
176 collect_register_by_name (regcache
, "fctrl", &val
);
179 collect_register_by_name (regcache
, "fstat", &val
);
182 /* Convert to the simplifed tag form stored in fxsave data. */
183 collect_register_by_name (regcache
, "ftag", &val
);
186 for (i
= 7; i
>= 0; i
--)
188 int tag
= (val
>> (i
* 2)) & 3;
195 collect_register_by_name (regcache
, "fiseg", &val
);
198 collect_register_by_name (regcache
, "foseg", &val
);
203 i387_ftag (struct i387_fxsave
*fp
, int regno
)
205 unsigned char *raw
= &fp
->st_space
[regno
* 16];
206 unsigned int exponent
;
207 unsigned long fraction
[2];
210 integer
= raw
[7] & 0x80;
211 exponent
= (((raw
[9] & 0x7f) << 8) | raw
[8]);
212 fraction
[0] = ((raw
[3] << 24) | (raw
[2] << 16) | (raw
[1] << 8) | raw
[0]);
213 fraction
[1] = (((raw
[7] & 0x7f) << 24) | (raw
[6] << 16)
214 | (raw
[5] << 8) | raw
[4]);
216 if (exponent
== 0x7fff)
221 else if (exponent
== 0x0000)
223 if (fraction
[0] == 0x0000 && fraction
[1] == 0x0000 && !integer
)
250 i387_fxsave_to_cache (struct regcache
*regcache
, const void *buf
)
252 struct i387_fxsave
*fp
= (struct i387_fxsave
*) buf
;
254 int st0_regnum
= find_regno ("st0");
255 int xmm0_regnum
= find_regno ("xmm0");
258 for (i
= 0; i
< 8; i
++)
259 supply_register (regcache
, i
+ st0_regnum
,
260 ((char *) &fp
->st_space
[0]) + i
* 16);
261 for (i
= 0; i
< num_xmm_registers
; i
++)
262 supply_register (regcache
, i
+ xmm0_regnum
,
263 ((char *) &fp
->xmm_space
[0]) + i
* 16);
265 supply_register_by_name (regcache
, "fioff", &fp
->fioff
);
266 supply_register_by_name (regcache
, "fooff", &fp
->fooff
);
267 supply_register_by_name (regcache
, "mxcsr", &fp
->mxcsr
);
269 /* Some registers are 16-bit. */
270 val
= fp
->fctrl
& 0xFFFF;
271 supply_register_by_name (regcache
, "fctrl", &val
);
273 val
= fp
->fstat
& 0xFFFF;
274 supply_register_by_name (regcache
, "fstat", &val
);
276 /* Generate the form of ftag data that GDB expects. */
277 top
= (fp
->fstat
>> 11) & 0x7;
279 for (i
= 7; i
>= 0; i
--)
282 if (fp
->ftag
& (1 << i
))
283 tag
= i387_ftag (fp
, (i
+ 8 - top
) % 8);
286 val
|= tag
<< (2 * i
);
288 supply_register_by_name (regcache
, "ftag", &val
);
290 val
= fp
->fiseg
& 0xFFFF;
291 supply_register_by_name (regcache
, "fiseg", &val
);
293 val
= fp
->foseg
& 0xFFFF;
294 supply_register_by_name (regcache
, "foseg", &val
);
296 val
= (fp
->fop
) & 0x7FF;
297 supply_register_by_name (regcache
, "fop", &val
);
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