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[/] [or1k/] [trunk/] [insight/] [gdb/] [i386aix-nat.c] - Blame information for rev 1765

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1 578 markom
/* Intel 386 native support.
2
   Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999,
3
   2000, 2001 Free Software Foundation, Inc.
4
 
5
   This file is part of GDB.
6
 
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 2 of the License, or
10
   (at your option) any later version.
11
 
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.
16
 
17
   You should have received a copy of the GNU General Public License
18
   along with this program; if not, write to the Free Software
19
   Foundation, Inc., 59 Temple Place - Suite 330,
20
   Boston, MA 02111-1307, USA.  */
21
 
22
#include "defs.h"
23
#include "frame.h"
24
#include "inferior.h"
25
#include "language.h"
26
#include "gdbcore.h"
27
#include "regcache.h"
28
 
29
#ifdef USG
30
#include <sys/types.h>
31
#endif
32
 
33
#include <sys/param.h>
34
#include <sys/dir.h>
35
#include <signal.h>
36
#include <sys/user.h>
37
#include <sys/ioctl.h>
38
#include <fcntl.h>
39
 
40
#include <sys/file.h>
41
#include "gdb_stat.h"
42
 
43
#include <stddef.h>
44
#include <sys/ptrace.h>
45
 
46
/* Does AIX define this in <errno.h>?  */
47
extern int errno;
48
 
49
#ifdef HAVE_SYS_REG_H
50
#include <sys/reg.h>
51
#endif
52
 
53
#include "floatformat.h"
54
 
55
#include "target.h"
56
 
57
static void fetch_core_registers (char *, unsigned, int, CORE_ADDR);
58
 
59
 
60
/* this table must line up with REGISTER_NAMES in tm-i386v.h */
61
/* symbols like 'EAX' come from <sys/reg.h> */
62
static int regmap[] =
63
{
64
  EAX, ECX, EDX, EBX,
65
  USP, EBP, ESI, EDI,
66
  EIP, EFL, CS, SS,
67
  DS, ES, FS, GS,
68
};
69
 
70
/* blockend is the value of u.u_ar0, and points to the
71
 * place where GS is stored
72
 */
73
 
74
int
75
i386_register_u_addr (int blockend, int regnum)
76
{
77
#if 0
78
  /* this will be needed if fp registers are reinstated */
79
  /* for now, you can look at them with 'info float'
80
   * sys5 wont let you change them with ptrace anyway
81
   */
82
  if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM)
83
    {
84
      int ubase, fpstate;
85
      struct user u;
86
      ubase = blockend + 4 * (SS + 1) - KSTKSZ;
87
      fpstate = ubase + ((char *) &u.u_fpstate - (char *) &u);
88
      return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
89
    }
90
  else
91
#endif
92
    return (blockend + 4 * regmap[regnum]);
93
 
94
}
95
 
96
/* The code below only work on the aix ps/2 (i386-ibm-aix) -
97
 * mtranle@paris - Sat Apr 11 10:34:12 1992
98
 */
99
 
100
struct env387
101
{
102
  unsigned short control;
103
  unsigned short r0;
104
  unsigned short status;
105
  unsigned short r1;
106
  unsigned short tag;
107
  unsigned short r2;
108
  unsigned long eip;
109
  unsigned short code_seg;
110
  unsigned short opcode;
111
  unsigned long operand;
112
  unsigned short operand_seg;
113
  unsigned short r3;
114
  unsigned char regs[8][10];
115
};
116
 
117
static
118
print_387_status (unsigned short status, struct env387 *ep)
119
{
120
  int i;
121
  int bothstatus;
122
  int top;
123
  int fpreg;
124
  unsigned char *p;
125
 
126
  bothstatus = ((status != 0) && (ep->status != 0));
127
  if (status != 0)
128
    {
129
      if (bothstatus)
130
        printf_unfiltered ("u: ");
131
      print_387_status_word (status);
132
    }
133
 
134
  if (ep->status != 0)
135
    {
136
      if (bothstatus)
137
        printf_unfiltered ("e: ");
138
      print_387_status_word (ep->status);
139
    }
140
 
141
  print_387_control_word (ep->control);
142
  printf_unfiltered ("last exception: ");
143
  printf_unfiltered ("opcode %s; ", local_hex_string (ep->opcode));
144
  printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg));
145
  printf_unfiltered ("%s; ", local_hex_string (ep->eip));
146
  printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg));
147
  printf_unfiltered (":%s\n", local_hex_string (ep->operand));
148
 
149
  top = ((ep->status >> 11) & 7);
150
 
151
  printf_unfiltered ("regno  tag  msb              lsb  value\n");
152
  for (fpreg = 7; fpreg >= 0; fpreg--)
153
    {
154
      double val;
155
 
156
      printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);
157
 
158
      switch ((ep->tag >> ((7 - fpreg) * 2)) & 3)
159
        {
160
        case 0:
161
          printf_unfiltered ("valid ");
162
          break;
163
        case 1:
164
          printf_unfiltered ("zero  ");
165
          break;
166
        case 2:
167
          printf_unfiltered ("trap  ");
168
          break;
169
        case 3:
170
          printf_unfiltered ("empty ");
171
          break;
172
        }
173
      for (i = 9; i >= 0; i--)
174
        printf_unfiltered ("%02x", ep->regs[fpreg][i]);
175
 
176
      i387_to_double ((char *) ep->regs[fpreg], (char *) &val);
177
      printf_unfiltered ("  %#g\n", val);
178
    }
179
}
180
 
181
static struct env387 core_env387;
182
 
183
void
184
i386_float_info (void)
185
{
186
  struct env387 fps;
187
  int fpsaved = 0;
188
  /* We need to reverse the order of the registers.  Apparently AIX stores
189
     the highest-numbered ones first.  */
190
  struct env387 fps_fixed;
191
  int i;
192
 
193
  if (! ptid_equal (inferior_ptid, null_ptid))
194
    {
195
      char buf[10];
196
      unsigned short status;
197
 
198
      ptrace (PT_READ_FPR, PIDGET (inferior_ptid), buf,
199
              offsetof (struct env387, status));
200
      memcpy (&status, buf, sizeof (status));
201
      fpsaved = status;
202
    }
203
  else
204
    {
205
      if ((fpsaved = core_env387.status) != 0)
206
        memcpy (&fps, &core_env387, sizeof (fps));
207
    }
208
 
209
  if (fpsaved == 0)
210
    {
211
      printf_unfiltered ("no floating point status saved\n");
212
      return;
213
    }
214
 
215
  if (! ptid_equal (inferior_ptid, null_ptid))
216
    {
217
      int offset;
218
      for (offset = 0; offset < sizeof (fps); offset += 10)
219
        {
220
          char buf[10];
221
          ptrace (PT_READ_FPR, PIDGET (inferior_ptid), buf, offset);
222
          memcpy ((char *) &fps.control + offset, buf,
223
                  MIN (10, sizeof (fps) - offset));
224
        }
225
    }
226
  fps_fixed = fps;
227
  for (i = 0; i < 8; ++i)
228
    memcpy (fps_fixed.regs[i], fps.regs[7 - i], 10);
229
  print_387_status (0, &fps_fixed);
230
}
231
 
232
/* Fetch one register.  */
233
static void
234
fetch_register (int regno)
235
{
236
  char buf[MAX_REGISTER_RAW_SIZE];
237
  if (regno < FP0_REGNUM)
238
    *(int *) buf = ptrace (PT_READ_GPR, PIDGET (inferior_ptid),
239
                           PT_REG (regmap[regno]), 0, 0);
240
  else
241
    ptrace (PT_READ_FPR, PIDGET (inferior_ptid), buf,
242
            (regno - FP0_REGNUM) * 10 + offsetof (struct env387, regs));
243
  supply_register (regno, buf);
244
}
245
 
246
void
247
fetch_inferior_registers (int regno)
248
{
249
  if (regno < 0)
250
    for (regno = 0; regno < NUM_REGS; regno++)
251
      fetch_register (regno);
252
  else
253
    fetch_register (regno);
254
}
255
 
256
/* store one register */
257
static void
258
store_register (int regno)
259
{
260
  char buf[80];
261
  errno = 0;
262
  if (regno < FP0_REGNUM)
263
    ptrace (PT_WRITE_GPR, PIDGET (inferior_ptid), PT_REG (regmap[regno]),
264
            *(int *) &registers[REGISTER_BYTE (regno)], 0);
265
  else
266
    ptrace (PT_WRITE_FPR, PIDGET (inferior_ptid),
267
            &registers[REGISTER_BYTE (regno)],
268
            (regno - FP0_REGNUM) * 10 + offsetof (struct env387, regs));
269
 
270
  if (errno != 0)
271
    {
272
      sprintf (buf, "writing register number %d", regno);
273
      perror_with_name (buf);
274
    }
275
}
276
 
277
/* Store our register values back into the inferior.
278
   If REGNO is -1, do this for all registers.
279
   Otherwise, REGNO specifies which register (so we can save time).  */
280
void
281
store_inferior_registers (int regno)
282
{
283
  if (regno < 0)
284
    for (regno = 0; regno < NUM_REGS; regno++)
285
      store_register (regno);
286
  else
287
    store_register (regno);
288
}
289
 
290
#ifndef CD_AX                   /* defined in sys/i386/coredump.h */
291
#define CD_AX   0
292
#define CD_BX   1
293
#define CD_CX   2
294
#define CD_DX   3
295
#define CD_SI   4
296
#define CD_DI   5
297
#define CD_BP   6
298
#define CD_SP   7
299
#define CD_FL   8
300
#define CD_IP   9
301
#define CD_CS   10
302
#define CD_DS   11
303
#define CD_ES   12
304
#define CD_FS   13
305
#define CD_GS   14
306
#define CD_SS   15
307
#endif
308
 
309
/*
310
 * The order here in core_regmap[] has to be the same as in
311
 * regmap[] above.
312
 */
313
static int core_regmap[] =
314
{
315
  CD_AX, CD_CX, CD_DX, CD_BX,
316
  CD_SP, CD_BP, CD_SI, CD_DI,
317
  CD_IP, CD_FL, CD_CS, CD_SS,
318
  CD_DS, CD_ES, CD_FS, CD_GS,
319
};
320
 
321
/* Provide registers to GDB from a core file.
322
 
323
   CORE_REG_SECT points to an array of bytes, which were obtained from
324
   a core file which BFD thinks might contain register contents.
325
   CORE_REG_SIZE is its size.
326
 
327
   WHICH says which register set corelow suspects this is:
328
 
329
     2 --- the floating-point register set
330
 
331
   REG_ADDR isn't used.  */
332
 
333
static void
334
fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
335
                      int which, CORE_ADDR reg_addr)
336
{
337
 
338
  if (which == 0)
339
    {
340
      /* Integer registers */
341
 
342
#define cd_regs(n) ((int *)core_reg_sect)[n]
343
#define regs(n) *((int *) &registers[REGISTER_BYTE (n)])
344
 
345
      int i;
346
      for (i = 0; i < FP0_REGNUM; i++)
347
        regs (i) = cd_regs (core_regmap[i]);
348
    }
349
  else if (which == 2)
350
    {
351
      /* Floating point registers */
352
 
353
      if (core_reg_size >= sizeof (core_env387))
354
        memcpy (&core_env387, core_reg_sect, core_reg_size);
355
      else
356
        fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");
357
    }
358
}
359
 
360
 
361
/* Register that we are able to handle i386aix core file formats.
362
   FIXME: is this really bfd_target_unknown_flavour? */
363
 
364
static struct core_fns i386aix_core_fns =
365
{
366
  bfd_target_unknown_flavour,           /* core_flavour */
367
  default_check_format,                 /* check_format */
368
  default_core_sniffer,                 /* core_sniffer */
369
  fetch_core_registers,                 /* core_read_registers */
370
  NULL                                  /* next */
371
};
372
 
373
void
374
_initialize_core_i386aix (void)
375
{
376
  add_core_fns (&i386aix_core_fns);
377
}

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