1/* Native-dependent code for SVR4 Unix running on i386's.
2   Copyright 1988, 1989, 1991, 1992, 1996, 1997, 1998, 1999, 2000,
3   2001, 2002
4   Free Software Foundation, Inc.
5
6   This file is part of GDB.
7
8   This program is free software; you can redistribute it and/or modify
9   it under the terms of the GNU General Public License as published by
10   the Free Software Foundation; either version 2 of the License, or
11   (at your option) any later version.
12
13   This program is distributed in the hope that it will be useful,
14   but WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16   GNU General Public License for more details.
17
18   You should have received a copy of the GNU General Public License
19   along with this program; if not, write to the Free Software
20   Foundation, Inc., 59 Temple Place - Suite 330,
21   Boston, MA 02111-1307, USA.  */
22
23#include "defs.h"
24#include "value.h"
25#include "inferior.h"
26#include "regcache.h"
27
28#ifdef HAVE_SYS_REG_H
29#include <sys/reg.h>
30#endif
31
32#include "i386-tdep.h"
33#include "i387-tdep.h"
34
35#ifdef HAVE_SYS_PROCFS_H
36
37#include <sys/procfs.h>
38
39/* Prototypes for supply_gregset etc. */
40#include "gregset.h"
41
42/* The `/proc' interface divides the target machine's register set up
43   into two different sets, the general purpose register set (gregset)
44   and the floating-point register set (fpregset).  For each set,
45   there is an ioctl to get the current register set and another ioctl
46   to set the current values.
47
48   The actual structure passed through the ioctl interface is, of
49   course, naturally machine dependent, and is different for each set
50   of registers.  For the i386 for example, the general-purpose
51   register set is typically defined by:
52
53   typedef int gregset_t[19];           (in <sys/regset.h>)
54
55   #define GS   0                       (in <sys/reg.h>)
56   #define FS   1
57   ...
58   #define UESP 17
59   #define SS   18
60
61   and the floating-point set by:
62
63   typedef struct fpregset   {
64           union {
65                   struct fpchip_state            // fp extension state //
66                   {
67                           int     state[27];     // 287/387 saved state //
68                           int     status;        // status word saved at //
69                                                  // exception //
70                   } fpchip_state;
71                   struct fp_emul_space           // for emulators //
72                   {
73                           char    fp_emul[246];
74                           char    fp_epad[2];
75                   } fp_emul_space;
76                   int     f_fpregs[62];          // union of the above //
77           } fp_reg_set;
78           long            f_wregs[33];           // saved weitek state //
79   } fpregset_t;
80
81   Incidentally fpchip_state contains the FPU state in the same format
82   as used by the "fsave" instruction, and that's the only thing we
83   support here.  I don't know how the emulator stores it state.  The
84   Weitek stuff definitely isn't supported.
85
86   The routines defined here, provide the packing and unpacking of
87   gregset_t and fpregset_t formatted data.  */
88
89#ifdef HAVE_GREGSET_T
90
91/* Mapping between the general-purpose registers in `/proc'
92   format and GDB's register array layout.  */
93static int regmap[] =
94{
95  EAX, ECX, EDX, EBX,
96  UESP, EBP, ESI, EDI,
97  EIP, EFL, CS, SS,
98  DS, ES, FS, GS,
99};
100
101/* Fill GDB's register array with the general-purpose register values
102   in *GREGSETP.  */
103
104void
105supply_gregset (gregset_t *gregsetp)
106{
107  greg_t *regp = (greg_t *) gregsetp;
108  int i;
109
110  for (i = 0; i < I386_NUM_GREGS; i++)
111    supply_register (i, (char *) (regp + regmap[i]));
112}
113
114/* Fill register REGNO (if it is a general-purpose register) in
115   *GREGSETPS with the value in GDB's register array.  If REGNO is -1,
116   do this for all registers.  */
117
118void
119fill_gregset (gregset_t *gregsetp, int regno)
120{
121  greg_t *regp = (greg_t *) gregsetp;
122  int i;
123
124  for (i = 0; i < I386_NUM_GREGS; i++)
125    if (regno == -1 || regno == i)
126      regcache_collect (i, regp + regmap[i]);
127}
128
129#endif /* HAVE_GREGSET_T */
130
131#ifdef HAVE_FPREGSET_T
132
133/* Fill GDB's register array with the floating-point register values in
134   *FPREGSETP.  */
135
136void
137supply_fpregset (fpregset_t *fpregsetp)
138{
139  if (FP0_REGNUM == 0)
140    return;
141
142  i387_supply_fsave (current_regcache, -1, fpregsetp);
143}
144
145/* Fill register REGNO (if it is a floating-point register) in
146   *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
147   do this for all registers.  */
148
149void
150fill_fpregset (fpregset_t *fpregsetp, int regno)
151{
152  if (FP0_REGNUM == 0)
153    return;
154
155  i387_fill_fsave ((char *) fpregsetp, regno);
156}
157
158#endif /* HAVE_FPREGSET_T */
159
160#endif /* HAVE_SYS_PROCFS_H */
161