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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [gdb/] [m68klinux-nat.c] - Blame information for rev 842

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1 227 jeremybenn
/* Motorola m68k native support for GNU/Linux.
2
 
3
   Copyright (C) 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
4
   2008, 2009, 2010 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 3 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, see <http://www.gnu.org/licenses/>.  */
20
 
21
#include "defs.h"
22
#include "frame.h"
23
#include "inferior.h"
24
#include "language.h"
25
#include "gdbcore.h"
26
#include "gdb_string.h"
27
#include "regcache.h"
28
#include "target.h"
29
#include "linux-nat.h"
30
 
31
#include "m68k-tdep.h"
32
 
33
#include <sys/param.h>
34
#include <sys/dir.h>
35
#include <signal.h>
36
#include <sys/ptrace.h>
37
#include <sys/user.h>
38
#include <sys/ioctl.h>
39
#include <fcntl.h>
40
#include <sys/procfs.h>
41
 
42
#ifdef HAVE_SYS_REG_H
43
#include <sys/reg.h>
44
#endif
45
 
46
#include <sys/file.h>
47
#include "gdb_stat.h"
48
 
49
#include "floatformat.h"
50
 
51
#include "target.h"
52
 
53
/* Prototypes for supply_gregset etc. */
54
#include "gregset.h"
55
 
56
/* This table must line up with gdbarch_register_name in "m68k-tdep.c".  */
57
static const int regmap[] =
58
{
59
  PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7,
60
  PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP,
61
  PT_SR, PT_PC,
62
  /* PT_FP0, ..., PT_FP7 */
63
  21, 24, 27, 30, 33, 36, 39, 42,
64
  /* PT_FPCR, PT_FPSR, PT_FPIAR */
65
  45, 46, 47
66
};
67
 
68
/* Which ptrace request retrieves which registers?
69
   These apply to the corresponding SET requests as well.  */
70
#define NUM_GREGS (18)
71
#define MAX_NUM_REGS (NUM_GREGS + 11)
72
 
73
int
74
getregs_supplies (int regno)
75
{
76
  return 0 <= regno && regno < NUM_GREGS;
77
}
78
 
79
int
80
getfpregs_supplies (int regno)
81
{
82
  return M68K_FP0_REGNUM <= regno && regno <= M68K_FPI_REGNUM;
83
}
84
 
85
/* Does the current host support the GETREGS request?  */
86
int have_ptrace_getregs =
87
#ifdef HAVE_PTRACE_GETREGS
88
  1
89
#else
90
 
91
#endif
92
;
93
 
94
 
95
 
96
/* Fetching registers directly from the U area, one at a time.  */
97
 
98
/* Fetch one register.  */
99
 
100
static void
101
fetch_register (struct regcache *regcache, int regno)
102
{
103
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
104
  long regaddr;
105
  int i;
106
  char buf[MAX_REGISTER_SIZE];
107
  int tid;
108
 
109
  /* Overload thread id onto process id */
110
  tid = TIDGET (inferior_ptid);
111
  if (tid == 0)
112
    tid = PIDGET (inferior_ptid);       /* no thread id, just use process id */
113
 
114
  regaddr = 4 * regmap[regno];
115
  for (i = 0; i < register_size (gdbarch, regno); i += sizeof (long))
116
    {
117
      errno = 0;
118
      *(long *) &buf[i] = ptrace (PTRACE_PEEKUSER, tid, regaddr, 0);
119
      regaddr += sizeof (long);
120
      if (errno != 0)
121
        error (_("Couldn't read register %s (#%d): %s."),
122
               gdbarch_register_name (gdbarch, regno),
123
               regno, safe_strerror (errno));
124
    }
125
  regcache_raw_supply (regcache, regno, buf);
126
}
127
 
128
/* Fetch register values from the inferior.
129
   If REGNO is negative, do this for all registers.
130
   Otherwise, REGNO specifies which register (so we can save time). */
131
 
132
static void
133
old_fetch_inferior_registers (struct regcache *regcache, int regno)
134
{
135
  if (regno >= 0)
136
    {
137
      fetch_register (regcache, regno);
138
    }
139
  else
140
    {
141
      for (regno = 0;
142
           regno < gdbarch_num_regs (get_regcache_arch (regcache));
143
           regno++)
144
        {
145
          fetch_register (regcache, regno);
146
        }
147
    }
148
}
149
 
150
/* Store one register. */
151
 
152
static void
153
store_register (const struct regcache *regcache, int regno)
154
{
155
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
156
  long regaddr;
157
  int i;
158
  int tid;
159
  char buf[MAX_REGISTER_SIZE];
160
 
161
  /* Overload thread id onto process id */
162
  tid = TIDGET (inferior_ptid);
163
  if (tid == 0)
164
    tid = PIDGET (inferior_ptid);       /* no thread id, just use process id */
165
 
166
  regaddr = 4 * regmap[regno];
167
 
168
  /* Put the contents of regno into a local buffer */
169
  regcache_raw_collect (regcache, regno, buf);
170
 
171
  /* Store the local buffer into the inferior a chunk at the time. */
172
  for (i = 0; i < register_size (gdbarch, regno); i += sizeof (long))
173
    {
174
      errno = 0;
175
      ptrace (PTRACE_POKEUSER, tid, regaddr, *(long *) &buf[i]);
176
      regaddr += sizeof (long);
177
      if (errno != 0)
178
        error (_("Couldn't write register %s (#%d): %s."),
179
               gdbarch_register_name (gdbarch, regno),
180
               regno, safe_strerror (errno));
181
    }
182
}
183
 
184
/* Store our register values back into the inferior.
185
   If REGNO is negative, do this for all registers.
186
   Otherwise, REGNO specifies which register (so we can save time).  */
187
 
188
static void
189
old_store_inferior_registers (const struct regcache *regcache, int regno)
190
{
191
  if (regno >= 0)
192
    {
193
      store_register (regcache, regno);
194
    }
195
  else
196
    {
197
      for (regno = 0;
198
           regno < gdbarch_num_regs (get_regcache_arch (regcache));
199
           regno++)
200
        {
201
          store_register (regcache, regno);
202
        }
203
    }
204
}
205
 
206
/*  Given a pointer to a general register set in /proc format
207
   (elf_gregset_t *), unpack the register contents and supply
208
   them as gdb's idea of the current register values. */
209
 
210
void
211
supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp)
212
{
213
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
214
  const elf_greg_t *regp = (const elf_greg_t *) gregsetp;
215
  int regi;
216
 
217
  for (regi = M68K_D0_REGNUM;
218
       regi <= gdbarch_sp_regnum (gdbarch);
219
       regi++)
220
    regcache_raw_supply (regcache, regi, &regp[regmap[regi]]);
221
  regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch),
222
                       &regp[PT_SR]);
223
  regcache_raw_supply (regcache,
224
                       gdbarch_pc_regnum (gdbarch), &regp[PT_PC]);
225
}
226
 
227
/* Fill register REGNO (if it is a general-purpose register) in
228
   *GREGSETPS with the value in GDB's register array.  If REGNO is -1,
229
   do this for all registers.  */
230
void
231
fill_gregset (const struct regcache *regcache,
232
              elf_gregset_t *gregsetp, int regno)
233
{
234
  elf_greg_t *regp = (elf_greg_t *) gregsetp;
235
  int i;
236
 
237
  for (i = 0; i < NUM_GREGS; i++)
238
    if (regno == -1 || regno == i)
239
      regcache_raw_collect (regcache, i, regp + regmap[i]);
240
}
241
 
242
#ifdef HAVE_PTRACE_GETREGS
243
 
244
/* Fetch all general-purpose registers from process/thread TID and
245
   store their values in GDB's register array.  */
246
 
247
static void
248
fetch_regs (struct regcache *regcache, int tid)
249
{
250
  elf_gregset_t regs;
251
 
252
  if (ptrace (PTRACE_GETREGS, tid, 0, (int) &regs) < 0)
253
    {
254
      if (errno == EIO)
255
        {
256
          /* The kernel we're running on doesn't support the GETREGS
257
             request.  Reset `have_ptrace_getregs'.  */
258
          have_ptrace_getregs = 0;
259
          return;
260
        }
261
 
262
      perror_with_name (_("Couldn't get registers"));
263
    }
264
 
265
  supply_gregset (regcache, (const elf_gregset_t *) &regs);
266
}
267
 
268
/* Store all valid general-purpose registers in GDB's register array
269
   into the process/thread specified by TID.  */
270
 
271
static void
272
store_regs (const struct regcache *regcache, int tid, int regno)
273
{
274
  elf_gregset_t regs;
275
 
276
  if (ptrace (PTRACE_GETREGS, tid, 0, (int) &regs) < 0)
277
    perror_with_name (_("Couldn't get registers"));
278
 
279
  fill_gregset (regcache, &regs, regno);
280
 
281
  if (ptrace (PTRACE_SETREGS, tid, 0, (int) &regs) < 0)
282
    perror_with_name (_("Couldn't write registers"));
283
}
284
 
285
#else
286
 
287
static void fetch_regs (struct regcache *regcache, int tid) {}
288
static void store_regs (const struct regcache *regcache, int tid, int regno) {}
289
 
290
#endif
291
 
292
 
293
/* Transfering floating-point registers between GDB, inferiors and cores.  */
294
 
295
/* What is the address of fpN within the floating-point register set F?  */
296
#define FPREG_ADDR(f, n) (&(f)->fpregs[(n) * 3])
297
 
298
/* Fill GDB's register array with the floating-point register values in
299
   *FPREGSETP.  */
300
 
301
void
302
supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp)
303
{
304
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
305
  int regi;
306
 
307
  for (regi = gdbarch_fp0_regnum (gdbarch);
308
       regi < gdbarch_fp0_regnum (gdbarch) + 8; regi++)
309
    regcache_raw_supply (regcache, regi,
310
                         FPREG_ADDR (fpregsetp,
311
                                     regi - gdbarch_fp0_regnum (gdbarch)));
312
  regcache_raw_supply (regcache, M68K_FPC_REGNUM, &fpregsetp->fpcntl[0]);
313
  regcache_raw_supply (regcache, M68K_FPS_REGNUM, &fpregsetp->fpcntl[1]);
314
  regcache_raw_supply (regcache, M68K_FPI_REGNUM, &fpregsetp->fpcntl[2]);
315
}
316
 
317
/* Fill register REGNO (if it is a floating-point register) in
318
   *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
319
   do this for all registers.  */
320
 
321
void
322
fill_fpregset (const struct regcache *regcache,
323
               elf_fpregset_t *fpregsetp, int regno)
324
{
325
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
326
  int i;
327
 
328
  /* Fill in the floating-point registers.  */
329
  for (i = gdbarch_fp0_regnum (gdbarch);
330
       i < gdbarch_fp0_regnum (gdbarch) + 8; i++)
331
    if (regno == -1 || regno == i)
332
      regcache_raw_collect (regcache, i,
333
                            FPREG_ADDR (fpregsetp,
334
                                        i - gdbarch_fp0_regnum (gdbarch)));
335
 
336
  /* Fill in the floating-point control registers.  */
337
  for (i = M68K_FPC_REGNUM; i <= M68K_FPI_REGNUM; i++)
338
    if (regno == -1 || regno == i)
339
      regcache_raw_collect (regcache, i,
340
                            &fpregsetp->fpcntl[i - M68K_FPC_REGNUM]);
341
}
342
 
343
#ifdef HAVE_PTRACE_GETREGS
344
 
345
/* Fetch all floating-point registers from process/thread TID and store
346
   thier values in GDB's register array.  */
347
 
348
static void
349
fetch_fpregs (struct regcache *regcache, int tid)
350
{
351
  elf_fpregset_t fpregs;
352
 
353
  if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
354
    perror_with_name (_("Couldn't get floating point status"));
355
 
356
  supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs);
357
}
358
 
359
/* Store all valid floating-point registers in GDB's register array
360
   into the process/thread specified by TID.  */
361
 
362
static void
363
store_fpregs (const struct regcache *regcache, int tid, int regno)
364
{
365
  elf_fpregset_t fpregs;
366
 
367
  if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
368
    perror_with_name (_("Couldn't get floating point status"));
369
 
370
  fill_fpregset (regcache, &fpregs, regno);
371
 
372
  if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0)
373
    perror_with_name (_("Couldn't write floating point status"));
374
}
375
 
376
#else
377
 
378
static void fetch_fpregs (struct regcache *regcache, int tid) {}
379
static void store_fpregs (const struct regcache *regcache, int tid, int regno) {}
380
 
381
#endif
382
 
383
/* Transferring arbitrary registers between GDB and inferior.  */
384
 
385
/* Fetch register REGNO from the child process.  If REGNO is -1, do
386
   this for all registers (including the floating point and SSE
387
   registers).  */
388
 
389
static void
390
m68k_linux_fetch_inferior_registers (struct target_ops *ops,
391
                                     struct regcache *regcache, int regno)
392
{
393
  int tid;
394
 
395
  /* Use the old method of peeking around in `struct user' if the
396
     GETREGS request isn't available.  */
397
  if (! have_ptrace_getregs)
398
    {
399
      old_fetch_inferior_registers (regcache, regno);
400
      return;
401
    }
402
 
403
  /* GNU/Linux LWP ID's are process ID's.  */
404
  tid = TIDGET (inferior_ptid);
405
  if (tid == 0)
406
    tid = PIDGET (inferior_ptid);               /* Not a threaded program.  */
407
 
408
  /* Use the PTRACE_GETFPXREGS request whenever possible, since it
409
     transfers more registers in one system call, and we'll cache the
410
     results.  But remember that fetch_fpxregs can fail, and return
411
     zero.  */
412
  if (regno == -1)
413
    {
414
      fetch_regs (regcache, tid);
415
 
416
      /* The call above might reset `have_ptrace_getregs'.  */
417
      if (! have_ptrace_getregs)
418
        {
419
          old_fetch_inferior_registers (regcache, -1);
420
          return;
421
        }
422
 
423
      fetch_fpregs (regcache, tid);
424
      return;
425
    }
426
 
427
  if (getregs_supplies (regno))
428
    {
429
      fetch_regs (regcache, tid);
430
      return;
431
    }
432
 
433
  if (getfpregs_supplies (regno))
434
    {
435
      fetch_fpregs (regcache, tid);
436
      return;
437
    }
438
 
439
  internal_error (__FILE__, __LINE__,
440
                  _("Got request for bad register number %d."), regno);
441
}
442
 
443
/* Store register REGNO back into the child process.  If REGNO is -1,
444
   do this for all registers (including the floating point and SSE
445
   registers).  */
446
static void
447
m68k_linux_store_inferior_registers (struct target_ops *ops,
448
                                     struct regcache *regcache, int regno)
449
{
450
  int tid;
451
 
452
  /* Use the old method of poking around in `struct user' if the
453
     SETREGS request isn't available.  */
454
  if (! have_ptrace_getregs)
455
    {
456
      old_store_inferior_registers (regcache, regno);
457
      return;
458
    }
459
 
460
  /* GNU/Linux LWP ID's are process ID's.  */
461
  tid = TIDGET (inferior_ptid);
462
  if (tid == 0)
463
    tid = PIDGET (inferior_ptid);       /* Not a threaded program.  */
464
 
465
  /* Use the PTRACE_SETFPREGS requests whenever possible, since it
466
     transfers more registers in one system call.  But remember that
467
     store_fpregs can fail, and return zero.  */
468
  if (regno == -1)
469
    {
470
      store_regs (regcache, tid, regno);
471
      store_fpregs (regcache, tid, regno);
472
      return;
473
    }
474
 
475
  if (getregs_supplies (regno))
476
    {
477
      store_regs (regcache, tid, regno);
478
      return;
479
    }
480
 
481
  if (getfpregs_supplies (regno))
482
    {
483
      store_fpregs (regcache, tid, regno);
484
      return;
485
    }
486
 
487
  internal_error (__FILE__, __LINE__,
488
                  _("Got request to store bad register number %d."), regno);
489
}
490
 
491
/* Interpreting register set info found in core files.  */
492
 
493
/* Provide registers to GDB from a core file.
494
 
495
   (We can't use the generic version of this function in
496
   core-regset.c, because we need to use elf_gregset_t instead of
497
   gregset_t.)
498
 
499
   CORE_REG_SECT points to an array of bytes, which are the contents
500
   of a `note' from a core file which BFD thinks might contain
501
   register contents.  CORE_REG_SIZE is its size.
502
 
503
   WHICH says which register set corelow suspects this is:
504
 
505
     2 --- the floating-point register set, in elf_fpregset_t format
506
 
507
   REG_ADDR isn't used on GNU/Linux.  */
508
 
509
static void
510
fetch_core_registers (struct regcache *regcache,
511
                      char *core_reg_sect, unsigned core_reg_size,
512
                      int which, CORE_ADDR reg_addr)
513
{
514
  elf_gregset_t gregset;
515
  elf_fpregset_t fpregset;
516
 
517
  switch (which)
518
    {
519
    case 0:
520
      if (core_reg_size != sizeof (gregset))
521
        warning (_("Wrong size gregset in core file."));
522
      else
523
        {
524
          memcpy (&gregset, core_reg_sect, sizeof (gregset));
525
          supply_gregset (regcache, (const elf_gregset_t *) &gregset);
526
        }
527
      break;
528
 
529
    case 2:
530
      if (core_reg_size != sizeof (fpregset))
531
        warning (_("Wrong size fpregset in core file."));
532
      else
533
        {
534
          memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
535
          supply_fpregset (regcache, (const elf_fpregset_t *) &fpregset);
536
        }
537
      break;
538
 
539
    default:
540
      /* We've covered all the kinds of registers we know about here,
541
         so this must be something we wouldn't know what to do with
542
         anyway.  Just ignore it.  */
543
      break;
544
    }
545
}
546
 
547
 
548
/* Register that we are able to handle GNU/Linux ELF core file
549
   formats.  */
550
 
551
static struct core_fns linux_elf_core_fns =
552
{
553
  bfd_target_elf_flavour,               /* core_flavour */
554
  default_check_format,                 /* check_format */
555
  default_core_sniffer,                 /* core_sniffer */
556
  fetch_core_registers,                 /* core_read_registers */
557
  NULL                                  /* next */
558
};
559
 
560
void _initialize_m68k_linux_nat (void);
561
 
562
void
563
_initialize_m68k_linux_nat (void)
564
{
565
  struct target_ops *t;
566
 
567
  /* Fill in the generic GNU/Linux methods.  */
568
  t = linux_target ();
569
 
570
  /* Add our register access methods.  */
571
  t->to_fetch_registers = m68k_linux_fetch_inferior_registers;
572
  t->to_store_registers = m68k_linux_store_inferior_registers;
573
 
574
  /* Register the target.  */
575
  linux_nat_add_target (t);
576
 
577
  deprecated_add_core_fns (&linux_elf_core_fns);
578
}

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