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[/] [or1k/] [trunk/] [gdb-5.0/] [gdb/] [i386aix-nat.c] - Blame information for rev 105

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

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