1 /* i387-specific utility functions, for the remote server for GDB.
2 Copyright (C) 2000, 2001, 2002, 2005, 2007, 2008, 2009
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 (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 (i
+ st0_regnum
, ((char *) &fp
->st_space
[0]) + i
* 10);
86 collect_register_by_name ("fioff", &fp
->fioff
);
87 collect_register_by_name ("fooff", &fp
->fooff
);
89 /* This one's 11 bits... */
90 collect_register_by_name ("fop", &val2
);
91 fp
->fop
= (val2
& 0x7FF) | (fp
->fop
& 0xF800);
93 /* Some registers are 16-bit. */
94 collect_register_by_name ("fctrl", &val
);
97 collect_register_by_name ("fstat", &val
);
101 collect_register_by_name ("ftag", &val
);
105 collect_register_by_name ("fiseg", &val
);
109 collect_register_by_name ("foseg", &val
);
115 i387_fsave_to_cache (const void *buf
)
117 struct i387_fsave
*fp
= (struct i387_fsave
*) buf
;
119 int st0_regnum
= find_regno ("st0");
122 for (i
= 0; i
< 8; i
++)
123 supply_register (i
+ st0_regnum
, ((char *) &fp
->st_space
[0]) + i
* 10);
125 supply_register_by_name ("fioff", &fp
->fioff
);
126 supply_register_by_name ("fooff", &fp
->fooff
);
128 /* Some registers are 16-bit. */
129 val
= fp
->fctrl
& 0xFFFF;
130 supply_register_by_name ("fctrl", &val
);
132 val
= fp
->fstat
& 0xFFFF;
133 supply_register_by_name ("fstat", &val
);
135 val
= fp
->ftag
& 0xFFFF;
136 supply_register_by_name ("ftag", &val
);
138 val
= fp
->fiseg
& 0xFFFF;
139 supply_register_by_name ("fiseg", &val
);
141 val
= fp
->foseg
& 0xFFFF;
142 supply_register_by_name ("foseg", &val
);
144 /* fop has only 11 valid bits. */
145 val
= (fp
->fop
) & 0x7FF;
146 supply_register_by_name ("fop", &val
);
150 i387_cache_to_fxsave (void *buf
)
152 struct i387_fxsave
*fp
= (struct i387_fxsave
*) buf
;
154 int st0_regnum
= find_regno ("st0");
155 int xmm0_regnum
= find_regno ("xmm0");
156 unsigned long val
, val2
;
158 for (i
= 0; i
< 8; i
++)
159 collect_register (i
+ st0_regnum
, ((char *) &fp
->st_space
[0]) + i
* 16);
160 for (i
= 0; i
< num_xmm_registers
; i
++)
161 collect_register (i
+ xmm0_regnum
, ((char *) &fp
->xmm_space
[0]) + i
* 16);
163 collect_register_by_name ("fioff", &fp
->fioff
);
164 collect_register_by_name ("fooff", &fp
->fooff
);
165 collect_register_by_name ("mxcsr", &fp
->mxcsr
);
167 /* This one's 11 bits... */
168 collect_register_by_name ("fop", &val2
);
169 fp
->fop
= (val2
& 0x7FF) | (fp
->fop
& 0xF800);
171 /* Some registers are 16-bit. */
172 collect_register_by_name ("fctrl", &val
);
175 collect_register_by_name ("fstat", &val
);
178 /* Convert to the simplifed tag form stored in fxsave data. */
179 collect_register_by_name ("ftag", &val
);
182 for (i
= 7; i
>= 0; i
--)
184 int tag
= (val
>> (i
* 2)) & 3;
191 collect_register_by_name ("fiseg", &val
);
194 collect_register_by_name ("foseg", &val
);
199 i387_ftag (struct i387_fxsave
*fp
, int regno
)
201 unsigned char *raw
= &fp
->st_space
[regno
* 16];
202 unsigned int exponent
;
203 unsigned long fraction
[2];
206 integer
= raw
[7] & 0x80;
207 exponent
= (((raw
[9] & 0x7f) << 8) | raw
[8]);
208 fraction
[0] = ((raw
[3] << 24) | (raw
[2] << 16) | (raw
[1] << 8) | raw
[0]);
209 fraction
[1] = (((raw
[7] & 0x7f) << 24) | (raw
[6] << 16)
210 | (raw
[5] << 8) | raw
[4]);
212 if (exponent
== 0x7fff)
217 else if (exponent
== 0x0000)
219 if (fraction
[0] == 0x0000 && fraction
[1] == 0x0000 && !integer
)
246 i387_fxsave_to_cache (const void *buf
)
248 struct i387_fxsave
*fp
= (struct i387_fxsave
*) buf
;
250 int st0_regnum
= find_regno ("st0");
251 int xmm0_regnum
= find_regno ("xmm0");
254 for (i
= 0; i
< 8; i
++)
255 supply_register (i
+ st0_regnum
, ((char *) &fp
->st_space
[0]) + i
* 16);
256 for (i
= 0; i
< num_xmm_registers
; i
++)
257 supply_register (i
+ xmm0_regnum
, ((char *) &fp
->xmm_space
[0]) + i
* 16);
259 supply_register_by_name ("fioff", &fp
->fioff
);
260 supply_register_by_name ("fooff", &fp
->fooff
);
261 supply_register_by_name ("mxcsr", &fp
->mxcsr
);
263 /* Some registers are 16-bit. */
264 val
= fp
->fctrl
& 0xFFFF;
265 supply_register_by_name ("fctrl", &val
);
267 val
= fp
->fstat
& 0xFFFF;
268 supply_register_by_name ("fstat", &val
);
270 /* Generate the form of ftag data that GDB expects. */
271 top
= (fp
->fstat
>> 11) & 0x7;
273 for (i
= 7; i
>= 0; i
--)
276 if (fp
->ftag
& (1 << i
))
277 tag
= i387_ftag (fp
, (i
+ 8 - top
) % 8);
280 val
|= tag
<< (2 * i
);
282 supply_register_by_name ("ftag", &val
);
284 val
= fp
->fiseg
& 0xFFFF;
285 supply_register_by_name ("fiseg", &val
);
287 val
= fp
->foseg
& 0xFFFF;
288 supply_register_by_name ("foseg", &val
);
290 val
= (fp
->fop
) & 0x7FF;
291 supply_register_by_name ("fop", &val
);
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