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[/] [or1k/] [trunk/] [insight/] [gdb/] [i386m3-nat.c] - Blame information for rev 1774

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1 578 markom
/* Low level interface to I386 running mach 3.0.
2
   Copyright 1992, 1993, 1994, 1996, 2000, 2001
3
   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 "inferior.h"
24
#include "floatformat.h"
25
#include "regcache.h"
26
 
27
#include <stdio.h>
28
 
29
#include <mach.h>
30
#include <mach/message.h>
31
#include <mach/exception.h>
32
#include <mach_error.h>
33
 
34
/* Hmmm... Should this not be here?
35
 * Now for i386_float_info() target_has_execution
36
 */
37
#include <target.h>
38
 
39
/* This mess is duplicated in bfd/i386mach3.h
40
 
41
 * This is an ugly way to hack around the incorrect
42
 * definition of UPAGES in i386/machparam.h.
43
 *
44
 * The definition should specify the size reserved
45
 * for "struct user" in core files in PAGES,
46
 * but instead it gives it in 512-byte core-clicks
47
 * for i386 and i860.
48
 */
49
#include <sys/param.h>
50
#if UPAGES == 16
51
#define UAREA_SIZE ctob(UPAGES)
52
#elif UPAGES == 2
53
#define UAREA_SIZE (NBPG*UPAGES)
54
#else
55
FIXME ! !UPAGES is neither 2 nor 16
56
#endif
57
 
58
/* @@@ Should move print_387_status() to i387-tdep.c */
59
extern void print_387_control_word ();          /* i387-tdep.h */
60
extern void print_387_status_word ();
61
 
62
#define private static
63
 
64
 
65
/* Find offsets to thread states at compile time.
66
 * If your compiler does not grok this, calculate offsets
67
 * offsets yourself and use them (or get a compatible compiler :-)
68
 */
69
 
70
#define  REG_OFFSET(reg) (int)(&((struct i386_thread_state *)0)->reg)
71
 
72
/* at reg_offset[i] is the offset to the i386_thread_state
73
 * location where the gdb registers[i] is stored.
74
 */
75
 
76
static int reg_offset[] =
77
{
78
  REG_OFFSET (eax), REG_OFFSET (ecx), REG_OFFSET (edx), REG_OFFSET (ebx),
79
  REG_OFFSET (uesp), REG_OFFSET (ebp), REG_OFFSET (esi), REG_OFFSET (edi),
80
  REG_OFFSET (eip), REG_OFFSET (efl), REG_OFFSET (cs), REG_OFFSET (ss),
81
  REG_OFFSET (ds), REG_OFFSET (es), REG_OFFSET (fs), REG_OFFSET (gs)
82
};
83
 
84
#define REG_ADDRESS(state,regnum) ((char *)(state)+reg_offset[regnum])
85
 
86
/* Fetch COUNT contiguous registers from thread STATE starting from REGNUM
87
 * Caller knows that the regs handled in one transaction are of same size.
88
 */
89
#define FETCH_REGS(state, regnum, count) \
90
  memcpy (&registers[REGISTER_BYTE (regnum)], \
91
          REG_ADDRESS (state, regnum), \
92
          count*REGISTER_SIZE)
93
 
94
/* Store COUNT contiguous registers to thread STATE starting from REGNUM */
95
#define STORE_REGS(state, regnum, count) \
96
  memcpy (REG_ADDRESS (state, regnum), \
97
          &registers[REGISTER_BYTE (regnum)], \
98
          count*REGISTER_SIZE)
99
 
100
/*
101
 * Fetch inferiors registers for gdb.
102
 * REGNO specifies which (as gdb views it) register, -1 for all.
103
 */
104
 
105
void
106
fetch_inferior_registers (int regno)
107
{
108
  kern_return_t ret;
109
  thread_state_data_t state;
110
  unsigned int stateCnt = i386_THREAD_STATE_COUNT;
111
  int index;
112
 
113
  if (!MACH_PORT_VALID (current_thread))
114
    error ("fetch inferior registers: Invalid thread");
115
 
116
  if (must_suspend_thread)
117
    setup_thread (current_thread, 1);
118
 
119
  ret = thread_get_state (current_thread,
120
                          i386_THREAD_STATE,
121
                          state,
122
                          &stateCnt);
123
 
124
  if (ret != KERN_SUCCESS)
125
    warning ("fetch_inferior_registers: %s ",
126
             mach_error_string (ret));
127
#if 0
128
  /* It may be more effective to store validate all of them,
129
   * since we fetched them all anyway
130
   */
131
  else if (regno != -1)
132
    supply_register (regno, (char *) state + reg_offset[regno]);
133
#endif
134
  else
135
    {
136
      for (index = 0; index < NUM_REGS; index++)
137
        supply_register (index, (char *) state + reg_offset[index]);
138
    }
139
 
140
  if (must_suspend_thread)
141
    setup_thread (current_thread, 0);
142
}
143
 
144
/* Store our register values back into the inferior.
145
 * If REGNO is -1, do this for all registers.
146
 * Otherwise, REGNO specifies which register
147
 *
148
 * On mach3 all registers are always saved in one call.
149
 */
150
void
151
store_inferior_registers (int regno)
152
{
153
  kern_return_t ret;
154
  thread_state_data_t state;
155
  unsigned int stateCnt = i386_THREAD_STATE_COUNT;
156
  register int index;
157
 
158
  if (!MACH_PORT_VALID (current_thread))
159
    error ("store inferior registers: Invalid thread");
160
 
161
  if (must_suspend_thread)
162
    setup_thread (current_thread, 1);
163
 
164
  /* Fetch the state of the current thread */
165
  ret = thread_get_state (current_thread,
166
                          i386_THREAD_STATE,
167
                          state,
168
                          &stateCnt);
169
 
170
  if (ret != KERN_SUCCESS)
171
    {
172
      warning ("store_inferior_registers (get): %s",
173
               mach_error_string (ret));
174
      if (must_suspend_thread)
175
        setup_thread (current_thread, 0);
176
      return;
177
    }
178
 
179
  /* move gdb's registers to thread's state
180
 
181
   * Since we save all registers anyway, save the ones
182
   * that gdb thinks are valid (e.g. ignore the regno
183
   * parameter)
184
   */
185
#if 0
186
  if (regno != -1)
187
    STORE_REGS (state, regno, 1);
188
  else
189
#endif
190
    {
191
      for (index = 0; index < NUM_REGS; index++)
192
        STORE_REGS (state, index, 1);
193
    }
194
 
195
  /* Write gdb's current view of register to the thread
196
   */
197
  ret = thread_set_state (current_thread,
198
                          i386_THREAD_STATE,
199
                          state,
200
                          i386_THREAD_STATE_COUNT);
201
 
202
  if (ret != KERN_SUCCESS)
203
    warning ("store_inferior_registers (set): %s",
204
             mach_error_string (ret));
205
 
206
  if (must_suspend_thread)
207
    setup_thread (current_thread, 0);
208
}
209
 
210
 
211
 
212
/* Return the address in the core dump or inferior of register REGNO.
213
 * BLOCKEND should be the address of the end of the UPAGES area read
214
 * in memory, but it's not?
215
 *
216
 * Currently our UX server dumps the whole thread state to the
217
 * core file. If your UX does something else, adapt the routine
218
 * below to return the offset to the given register.
219
 *
220
 * Called by core-aout.c(fetch_core_registers)
221
 */
222
 
223
CORE_ADDR
224
register_addr (int regno, CORE_ADDR blockend)
225
{
226
  CORE_ADDR addr;
227
 
228
  if (regno < 0 || regno >= NUM_REGS)
229
    error ("Invalid register number %d.", regno);
230
 
231
  /* UAREA_SIZE == 8 kB in i386 */
232
  addr = (unsigned int) REG_ADDRESS (UAREA_SIZE - sizeof (struct i386_thread_state), regno);
233
 
234
  return addr;
235
}
236
 
237
/* jtv@hut.fi: I copied and modified this 387 code from
238
 * gdb/i386-xdep.c. Modifications for Mach 3.0.
239
 *
240
 * i387 status dumper. See also i387-tdep.c
241
 */
242
struct env387
243
{
244
  unsigned short control;
245
  unsigned short r0;
246
  unsigned short status;
247
  unsigned short r1;
248
  unsigned short tag;
249
  unsigned short r2;
250
  unsigned long eip;
251
  unsigned short code_seg;
252
  unsigned short opcode;
253
  unsigned long operand;
254
  unsigned short operand_seg;
255
  unsigned short r3;
256
  unsigned char regs[8][10];
257
};
258
/* This routine is machine independent?
259
 * Should move it to i387-tdep.c but you need to export struct env387
260
 */
261
private
262
print_387_status (unsigned short status, struct env387 *ep)
263
{
264
  int i;
265
  int bothstatus;
266
  int top;
267
  int fpreg;
268
  unsigned char *p;
269
 
270
  bothstatus = ((status != 0) && (ep->status != 0));
271
  if (status != 0)
272
    {
273
      if (bothstatus)
274
        printf_unfiltered ("u: ");
275
      print_387_status_word (status);
276
    }
277
 
278
  if (ep->status != 0)
279
    {
280
      if (bothstatus)
281
        printf_unfiltered ("e: ");
282
      print_387_status_word (ep->status);
283
    }
284
 
285
  print_387_control_word (ep->control);
286
  printf_unfiltered ("last exception: ");
287
  printf_unfiltered ("opcode %s; ", local_hex_string (ep->opcode));
288
  printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg));
289
  printf_unfiltered ("%s; ", local_hex_string (ep->eip));
290
  printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg));
291
  printf_unfiltered (":%s\n", local_hex_string (ep->operand));
292
 
293
  top = (ep->status >> 11) & 7;
294
 
295
  printf_unfiltered ("regno  tag  msb              lsb  value\n");
296
  for (fpreg = 7; fpreg >= 0; fpreg--)
297
    {
298
      double val;
299
 
300
      printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);
301
 
302
      switch ((ep->tag >> (fpreg * 2)) & 3)
303
        {
304
        case 0:
305
          printf_unfiltered ("valid ");
306
          break;
307
        case 1:
308
          printf_unfiltered ("zero  ");
309
          break;
310
        case 2:
311
          printf_unfiltered ("trap  ");
312
          break;
313
        case 3:
314
          printf_unfiltered ("empty ");
315
          break;
316
        }
317
      for (i = 9; i >= 0; i--)
318
        printf_unfiltered ("%02x", ep->regs[fpreg][i]);
319
 
320
      floatformat_to_double (&floatformat_i387_ext, (char *) ep->regs[fpreg],
321
                             &val);
322
      printf_unfiltered ("  %g\n", val);
323
    }
324
  if (ep->r0)
325
    printf_unfiltered ("warning: reserved0 is %s\n", local_hex_string (ep->r0));
326
  if (ep->r1)
327
    printf_unfiltered ("warning: reserved1 is %s\n", local_hex_string (ep->r1));
328
  if (ep->r2)
329
    printf_unfiltered ("warning: reserved2 is %s\n", local_hex_string (ep->r2));
330
  if (ep->r3)
331
    printf_unfiltered ("warning: reserved3 is %s\n", local_hex_string (ep->r3));
332
}
333
 
334
/*
335
 * values that go into fp_kind (from <i386/fpreg.h>)
336
 */
337
#define FP_NO   0               /* no fp chip, no emulator (no fp support)      */
338
#define FP_SW   1               /* no fp chip, using software emulator          */
339
#define FP_HW   2               /* chip present bit                             */
340
#define FP_287  2               /* 80287 chip present                           */
341
#define FP_387  3               /* 80387 chip present                           */
342
 
343
typedef struct fpstate
344
{
345
#if 1
346
  unsigned char state[FP_STATE_BYTES];  /* "hardware" state */
347
#else
348
  struct env387 state;          /* Actually this */
349
#endif
350
  int status;                   /* Duplicate status */
351
}
352
 *fpstate_t;
353
 
354
/* Mach 3 specific routines.
355
 */
356
private boolean_t
357
get_i387_state (struct fpstate *fstate)
358
{
359
  kern_return_t ret;
360
  thread_state_data_t state;
361
  unsigned int fsCnt = i386_FLOAT_STATE_COUNT;
362
  struct i386_float_state *fsp;
363
 
364
  ret = thread_get_state (current_thread,
365
                          i386_FLOAT_STATE,
366
                          state,
367
                          &fsCnt);
368
 
369
  if (ret != KERN_SUCCESS)
370
    {
371
      warning ("Can not get live floating point state: %s",
372
               mach_error_string (ret));
373
      return FALSE;
374
    }
375
 
376
  fsp = (struct i386_float_state *) state;
377
  /* The 387 chip (also 486 counts) or a software emulator? */
378
  if (!fsp->initialized || (fsp->fpkind != FP_387 && fsp->fpkind != FP_SW))
379
    return FALSE;
380
 
381
  /* Clear the target then copy thread's float state there.
382
     Make a copy of the status word, for some reason?
383
   */
384
  memset (fstate, 0, sizeof (struct fpstate));
385
 
386
  fstate->status = fsp->exc_status;
387
 
388
  memcpy (fstate->state, (char *) &fsp->hw_state, FP_STATE_BYTES);
389
 
390
  return TRUE;
391
}
392
 
393
private boolean_t
394
get_i387_core_state (struct fpstate *fstate)
395
{
396
  /* Not implemented yet. Core files do not contain float state. */
397
  return FALSE;
398
}
399
 
400
/*
401
 * This is called by "info float" command
402
 */
403
void
404
i386_mach3_float_info (void)
405
{
406
  char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
407
  boolean_t valid = FALSE;
408
  fpstate_t fps;
409
 
410
  if (target_has_execution)
411
    valid = get_i387_state (buf);
412
#if 0
413
  else if (WE HAVE CORE FILE)   /* @@@@ Core files not supported */
414
    valid = get_i387_core_state (buf);
415
#endif
416
 
417
  if (!valid)
418
    {
419
      warning ("no floating point status saved");
420
      return;
421
    }
422
 
423
  fps = (fpstate_t) buf;
424
 
425
  print_387_status (fps->status, (struct env387 *) fps->state);
426
}

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