1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
|
/* Native-dependent code for SVR4 Unix running on i386's, for GDB.
Copyright 1988, 1989, 1991, 1992, 1996, 1998 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "value.h"
#include "inferior.h"
#ifdef HAVE_SYS_REG_H
#include <sys/reg.h>
#endif
#ifdef HAVE_SYS_PROCFS_H
#include <sys/procfs.h>
/* Prototypes for supply_gregset etc. */
#include "gregset.h"
/* The /proc interface divides the target machine's register set up into
two different sets, the general register set (gregset) and the floating
point register set (fpregset). For each set, there is an ioctl to get
the current register set and another ioctl to set the current values.
The actual structure passed through the ioctl interface is, of course,
naturally machine dependent, and is different for each set of registers.
For the i386 for example, the general register set is typically defined
by:
typedef int gregset_t[19]; (in <sys/regset.h>)
#define GS 0 (in <sys/reg.h>)
#define FS 1
...
#define UESP 17
#define SS 18
and the floating point set by:
typedef struct fpregset
{
union
{
struct fpchip_state // fp extension state //
{
int state[27]; // 287/387 saved state //
int status; // status word saved at exception //
} fpchip_state;
struct fp_emul_space // for emulators //
{
char fp_emul[246];
char fp_epad[2];
} fp_emul_space;
int f_fpregs[62]; // union of the above //
} fp_reg_set;
long f_wregs[33]; // saved weitek state //
} fpregset_t;
These routines provide the packing and unpacking of gregset_t and
fpregset_t formatted data.
*/
#ifdef HAVE_GREGSET_T
/* This is a duplicate of the table in i386-xdep.c. */
static int regmap[] =
{
EAX, ECX, EDX, EBX,
UESP, EBP, ESI, EDI,
EIP, EFL, CS, SS,
DS, ES, FS, GS,
};
/* Prototypes for local functions */
void fill_gregset (gregset_t *, int);
void supply_gregset (gregset_t *);
void supply_fpregset (fpregset_t *);
void fill_fpregset (fpregset_t *, int);
/* FIXME: These routine absolutely depends upon (NUM_REGS - NUM_FREGS)
being less than or equal to the number of registers that can be stored
in a gregset_t. Note that with the current scheme there will typically
be more registers actually stored in a gregset_t that what we know
about. This is bogus and should be fixed. */
/* Given a pointer to a general register set in /proc format (gregset_t *),
unpack the register contents and supply them as gdb's idea of the current
register values. */
void
supply_gregset (gregsetp)
gregset_t *gregsetp;
{
register int regi;
register greg_t *regp = (greg_t *) gregsetp;
extern int regmap[];
for (regi = 0; regi < (NUM_REGS - NUM_FREGS); regi++)
{
supply_register (regi, (char *) (regp + regmap[regi]));
}
}
void
fill_gregset (gregsetp, regno)
gregset_t *gregsetp;
int regno;
{
int regi;
register greg_t *regp = (greg_t *) gregsetp;
extern int regmap[];
for (regi = 0; regi < (NUM_REGS - NUM_FREGS); regi++)
{
if ((regno == -1) || (regno == regi))
{
*(regp + regmap[regi]) = *(int *) ®isters[REGISTER_BYTE (regi)];
}
}
}
#endif /* HAVE_GREGSET_T */
#if defined (HAVE_FPREGSET_T)
/* Given a pointer to a floating point register set in /proc format
(fpregset_t *), unpack the register contents and supply them as gdb's
idea of the current floating point register values. */
/* FIXME: Assumes that fpregsetp contains an i387 FSAVE area. */
static const int freg_offset_map[] =
{
#if !defined(FPREGSET_FSAVE_OFFSET)
#define FPREGSET_FSAVE_OFFSET 0
#endif
FPREGSET_FSAVE_OFFSET + 28 + 0 * 10,
FPREGSET_FSAVE_OFFSET + 28 + 1 * 10,
FPREGSET_FSAVE_OFFSET + 28 + 2 * 10,
FPREGSET_FSAVE_OFFSET + 28 + 3 * 10,
FPREGSET_FSAVE_OFFSET + 28 + 4 * 10,
FPREGSET_FSAVE_OFFSET + 28 + 5 * 10,
FPREGSET_FSAVE_OFFSET + 28 + 6 * 10,
FPREGSET_FSAVE_OFFSET + 28 + 7 * 10,
FPREGSET_FSAVE_OFFSET + 0,
FPREGSET_FSAVE_OFFSET + 4,
FPREGSET_FSAVE_OFFSET + 8,
FPREGSET_FSAVE_OFFSET + 16,
FPREGSET_FSAVE_OFFSET + 12,
FPREGSET_FSAVE_OFFSET + 24,
FPREGSET_FSAVE_OFFSET + 20,
FPREGSET_FSAVE_OFFSET + 16
};
void
supply_fpregset (fpregsetp)
fpregset_t *fpregsetp;
{
int regi;
if (NUM_FREGS == 0)
return;
for (regi = FP0_REGNUM; regi <= LAST_FPU_CTRL_REGNUM; regi++)
{
char tbuf[4];
ULONGEST tval;
char *from = (char *) fpregsetp + freg_offset_map[regi - FP0_REGNUM];
if (regi == FCS_REGNUM)
{
tval = extract_unsigned_integer (from, 4) & 0xffff;
store_unsigned_integer (tbuf, 4, tval);
supply_register (regi, tbuf);
}
else if (regi == FOP_REGNUM)
{
tval = (extract_unsigned_integer (from, 4) >> 16) & ((1 << 11) - 1);
store_unsigned_integer (tbuf, 4, tval);
supply_register (regi, tbuf);
}
else
supply_register (regi, from);
}
}
/* Given a pointer to a floating point register set in /proc format
(fpregset_t *), update the register specified by REGNO from gdb's idea
of the current floating point register set. If REGNO is -1, update
them all. */
void
fill_fpregset (fpregsetp, regno)
fpregset_t *fpregsetp;
int regno;
{
int regi;
if (NUM_FREGS == 0)
return;
for (regi = FP0_REGNUM; regi <= LAST_FPU_CTRL_REGNUM; regi++)
{
if ((regno == -1) || (regno == regi))
{
char *to = (char *) fpregsetp + freg_offset_map[regi - FP0_REGNUM];
char *from = (char *) ®isters[REGISTER_BYTE (regi)];
ULONGEST valto;
ULONGEST valfrom;
if (regi == FCS_REGNUM)
{
valto = extract_unsigned_integer (to, 4);
valfrom = extract_unsigned_integer (from, 4);
valto = (valto & ~0xffff) | (valfrom & 0xffff);
store_unsigned_integer (to, 4, valto);
}
else if (regi == FOP_REGNUM)
{
valto = extract_unsigned_integer (to, 4);
valfrom = extract_unsigned_integer (from, 4);
valto = (valto & 0xffff) | ((valfrom & ((1 << 11) - 1)) << 16);
store_unsigned_integer (to, 4, valto);
}
else
{
memcpy (to, from, REGISTER_RAW_SIZE (regi));
}
}
}
}
#endif /* defined (HAVE_FPREGSET_T) */
#endif /* HAVE_SYS_PROCFS_H */
|
