1/* Native-dependent code for Unix SVR4 running on i386's.
2
3   Copyright 1988, 1989, 1991, 1992, 1996, 1997, 1998, 1999, 2000,
4   2001, 2002, 2004
5   Free Software Foundation, Inc.
6
7   This file is part of GDB.
8
9   This program is free software; you can redistribute it and/or modify
10   it under the terms of the GNU General Public License as published by
11   the Free Software Foundation; either version 2 of the License, or
12   (at your option) any later version.
13
14   This program is distributed in the hope that it will be useful,
15   but WITHOUT ANY WARRANTY; without even the implied warranty of
16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17   GNU General Public License for more details.
18
19   You should have received a copy of the GNU General Public License
20   along with this program; if not, write to the Free Software
21   Foundation, Inc., 59 Temple Place - Suite 330,
22   Boston, MA 02111-1307, USA.  */
23
24#include "defs.h"
25#include "value.h"
26#include "inferior.h"
27#include "regcache.h"
28
29#ifdef HAVE_SYS_REG_H
30#include <sys/reg.h>
31#endif
32
33#include "i386-tdep.h"
34#include "i387-tdep.h"
35
36#ifdef HAVE_SYS_PROCFS_H
37
38#include <sys/procfs.h>
39
40/* Prototypes for supply_gregset etc. */
41#include "gregset.h"
42
43/* The `/proc' interface divides the target machine's register set up
44   into two different sets, the general purpose register set (gregset)
45   and the floating-point register set (fpregset).  For each set,
46   there is an ioctl to get the current register set and another ioctl
47   to set the current values.
48
49   The actual structure passed through the ioctl interface is, of
50   course, naturally machine dependent, and is different for each set
51   of registers.  For the i386 for example, the general-purpose
52   register set is typically defined by:
53
54   typedef int gregset_t[19];           (in <sys/regset.h>)
55
56   #define GS   0                       (in <sys/reg.h>)
57   #define FS   1
58   ...
59   #define UESP 17
60   #define SS   18
61
62   and the floating-point set by:
63
64   typedef struct fpregset   {
65           union {
66                   struct fpchip_state            // fp extension state //
67                   {
68                           int     state[27];     // 287/387 saved state //
69                           int     status;        // status word saved at //
70                                                  // exception //
71                   } fpchip_state;
72                   struct fp_emul_space           // for emulators //
73                   {
74                           char    fp_emul[246];
75                           char    fp_epad[2];
76                   } fp_emul_space;
77                   int     f_fpregs[62];          // union of the above //
78           } fp_reg_set;
79           long            f_wregs[33];           // saved weitek state //
80   } fpregset_t;
81
82   Incidentally fpchip_state contains the FPU state in the same format
83   as used by the "fsave" instruction, and that's the only thing we
84   support here.  I don't know how the emulator stores it state.  The
85   Weitek stuff definitely isn't supported.
86
87   The routines defined here, provide the packing and unpacking of
88   gregset_t and fpregset_t formatted data.  */
89
90#ifdef HAVE_GREGSET_T
91
92/* Mapping between the general-purpose registers in `/proc'
93   format and GDB's register array layout.  */
94static int regmap[] =
95{
96  EAX, ECX, EDX, EBX,
97  UESP, EBP, ESI, EDI,
98  EIP, EFL, CS, SS,
99  DS, ES, FS, GS
100};
101
102/* Fill GDB's register array with the general-purpose register values
103   in *GREGSETP.  */
104
105void
106supply_gregset (gregset_t *gregsetp)
107{
108  greg_t *regp = (greg_t *) gregsetp;
109  int regnum;
110
111  for (regnum = 0; regnum < I386_NUM_GREGS; regnum++)
112    regcache_raw_supply (current_regcache, regnum, regp + regmap[regnum]);
113}
114
115/* Fill register REGNUM (if it is a general-purpose register) in
116   *GREGSETPS with the value in GDB's register array.  If REGNUM is -1,
117   do this for all registers.  */
118
119void
120fill_gregset (gregset_t *gregsetp, int regnum)
121{
122  greg_t *regp = (greg_t *) gregsetp;
123  int i;
124
125  for (i = 0; i < I386_NUM_GREGS; i++)
126    if (regnum == -1 || regnum == i)
127      regcache_raw_collect (current_regcache, i, regp + regmap[i]);
128}
129
130#endif /* HAVE_GREGSET_T */
131
132#ifdef HAVE_FPREGSET_T
133
134/* Fill GDB's register array with the floating-point register values in
135   *FPREGSETP.  */
136
137void
138supply_fpregset (fpregset_t *fpregsetp)
139{
140  if (FP0_REGNUM == 0)
141    return;
142
143  i387_supply_fsave (current_regcache, -1, fpregsetp);
144}
145
146/* Fill register REGNO (if it is a floating-point register) in
147   *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
148   do this for all registers.  */
149
150void
151fill_fpregset (fpregset_t *fpregsetp, int regno)
152{
153  if (FP0_REGNUM == 0)
154    return;
155
156  i387_fill_fsave ((char *) fpregsetp, regno);
157}
158
159#endif /* HAVE_FPREGSET_T */
160
161#endif /* HAVE_SYS_PROCFS_H */
162