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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [gdb/] [m68klinux-nat.c] - Blame information for rev 840

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1 24 jeremybenn
/* Motorola m68k native support for GNU/Linux.
2
 
3
   Copyright (C) 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
4
   2008 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
/* FIXME: This duplicates code from `inptrace.c'.  The problem is that we
99
   define FETCH_INFERIOR_REGISTERS since we want to use our own versions
100
   of {fetch,store}_inferior_registers that use the GETREGS request.  This
101
   means that the code in `infptrace.c' is #ifdef'd out.  But we need to
102
   fall back on that code when GDB is running on top of a kernel that
103
   doesn't support the GETREGS request.  */
104
 
105
#ifndef PT_READ_U
106
#define PT_READ_U PTRACE_PEEKUSR
107
#endif
108
#ifndef PT_WRITE_U
109
#define PT_WRITE_U PTRACE_POKEUSR
110
#endif
111
 
112
/* Fetch one register.  */
113
 
114
static void
115
fetch_register (struct regcache *regcache, int regno)
116
{
117
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
118
  /* This isn't really an address.  But ptrace thinks of it as one.  */
119
  CORE_ADDR regaddr;
120
  char mess[128];               /* For messages */
121
  int i;
122
  char buf[MAX_REGISTER_SIZE];
123
  int tid;
124
 
125
  if (gdbarch_cannot_fetch_register (gdbarch, regno))
126
    {
127
      memset (buf, '\0', register_size (gdbarch, regno)); /* Supply zeroes */
128
      regcache_raw_supply (regcache, regno, buf);
129
      return;
130
    }
131
 
132
  /* Overload thread id onto process id */
133
  tid = TIDGET (inferior_ptid);
134
  if (tid == 0)
135
    tid = PIDGET (inferior_ptid);       /* no thread id, just use process id */
136
 
137
  regaddr = 4 * regmap[regno];
138
  for (i = 0; i < register_size (gdbarch, regno);
139
       i += sizeof (PTRACE_TYPE_RET))
140
    {
141
      errno = 0;
142
      *(PTRACE_TYPE_RET *) &buf[i] = ptrace (PT_READ_U, tid,
143
                                              (PTRACE_TYPE_ARG3) regaddr, 0);
144
      regaddr += sizeof (PTRACE_TYPE_RET);
145
      if (errno != 0)
146
        {
147
          sprintf (mess, "reading register %s (#%d)",
148
                   gdbarch_register_name (gdbarch, regno), regno);
149
          perror_with_name (mess);
150
        }
151
    }
152
  regcache_raw_supply (regcache, regno, buf);
153
}
154
 
155
/* Fetch register values from the inferior.
156
   If REGNO is negative, do this for all registers.
157
   Otherwise, REGNO specifies which register (so we can save time). */
158
 
159
static void
160
old_fetch_inferior_registers (struct regcache *regcache, int regno)
161
{
162
  if (regno >= 0)
163
    {
164
      fetch_register (regcache, regno);
165
    }
166
  else
167
    {
168
      for (regno = 0;
169
           regno < gdbarch_num_regs (get_regcache_arch (regcache));
170
           regno++)
171
        {
172
          fetch_register (regcache, regno);
173
        }
174
    }
175
}
176
 
177
/* Store one register. */
178
 
179
static void
180
store_register (const struct regcache *regcache, int regno)
181
{
182
  struct gdbarch *gdbarch = reg_regcache_arch (regcache);
183
  /* This isn't really an address.  But ptrace thinks of it as one.  */
184
  CORE_ADDR regaddr;
185
  char mess[128];               /* For messages */
186
  int i;
187
  int tid;
188
  char buf[MAX_REGISTER_SIZE];
189
 
190
  if (gdbarch_cannot_store_register (gdbarch, regno))
191
    return;
192
 
193
  /* Overload thread id onto process id */
194
  tid = TIDGET (inferior_ptid);
195
  if (tid == 0)
196
    tid = PIDGET (inferior_ptid);       /* no thread id, just use process id */
197
 
198
  regaddr = 4 * regmap[regno];
199
 
200
  /* Put the contents of regno into a local buffer */
201
  regcache_raw_collect (regcache, regno, buf);
202
 
203
  /* Store the local buffer into the inferior a chunk at the time. */
204
  for (i = 0; i < register_size (gdbarch, regno);
205
       i += sizeof (PTRACE_TYPE_RET))
206
    {
207
      errno = 0;
208
      ptrace (PT_WRITE_U, tid, (PTRACE_TYPE_ARG3) regaddr,
209
              *(PTRACE_TYPE_RET *) (buf + i));
210
      regaddr += sizeof (PTRACE_TYPE_RET);
211
      if (errno != 0)
212
        {
213
          sprintf (mess, "writing register %s (#%d)",
214
                   gdbarch_register_name (gdbarch, regno), regno);
215
          perror_with_name (mess);
216
        }
217
    }
218
}
219
 
220
/* Store our register values back into the inferior.
221
   If REGNO is negative, do this for all registers.
222
   Otherwise, REGNO specifies which register (so we can save time).  */
223
 
224
static void
225
old_store_inferior_registers (const struct regcache *regcache, int regno)
226
{
227
  if (regno >= 0)
228
    {
229
      store_register (regcache, regno);
230
    }
231
  else
232
    {
233
      for (regno = 0;
234
           regno < gdbarch_num_regs (get_regcache_arch (regcache));
235
           regno++)
236
        {
237
          store_register (regcache, regno);
238
        }
239
    }
240
}
241
 
242
/*  Given a pointer to a general register set in /proc format
243
   (elf_gregset_t *), unpack the register contents and supply
244
   them as gdb's idea of the current register values. */
245
 
246
void
247
supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp)
248
{
249
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
250
  const elf_greg_t *regp = (const elf_greg_t *) gregsetp;
251
  int regi;
252
 
253
  for (regi = M68K_D0_REGNUM;
254
       regi <= gdbarch_sp_regnum (gdbarch);
255
       regi++)
256
    regcache_raw_supply (regcache, regi, &regp[regmap[regi]]);
257
  regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch),
258
                       &regp[PT_SR]);
259
  regcache_raw_supply (regcache,
260
                       gdbarch_pc_regnum (gdbarch), &regp[PT_PC]);
261
}
262
 
263
/* Fill register REGNO (if it is a general-purpose register) in
264
   *GREGSETPS with the value in GDB's register array.  If REGNO is -1,
265
   do this for all registers.  */
266
void
267
fill_gregset (const struct regcache *regcache,
268
              elf_gregset_t *gregsetp, int regno)
269
{
270
  elf_greg_t *regp = (elf_greg_t *) gregsetp;
271
  int i;
272
 
273
  for (i = 0; i < NUM_GREGS; i++)
274
    if (regno == -1 || regno == i)
275
      regcache_raw_collect (regcache, i, regp + regmap[i]);
276
}
277
 
278
#ifdef HAVE_PTRACE_GETREGS
279
 
280
/* Fetch all general-purpose registers from process/thread TID and
281
   store their values in GDB's register array.  */
282
 
283
static void
284
fetch_regs (struct regcache *regcache, int tid)
285
{
286
  elf_gregset_t regs;
287
 
288
  if (ptrace (PTRACE_GETREGS, tid, 0, (int) &regs) < 0)
289
    {
290
      if (errno == EIO)
291
        {
292
          /* The kernel we're running on doesn't support the GETREGS
293
             request.  Reset `have_ptrace_getregs'.  */
294
          have_ptrace_getregs = 0;
295
          return;
296
        }
297
 
298
      perror_with_name (_("Couldn't get registers"));
299
    }
300
 
301
  supply_gregset (regcache, (const elf_gregset_t *) &regs);
302
}
303
 
304
/* Store all valid general-purpose registers in GDB's register array
305
   into the process/thread specified by TID.  */
306
 
307
static void
308
store_regs (const struct regcache *regcache, int tid, int regno)
309
{
310
  elf_gregset_t regs;
311
 
312
  if (ptrace (PTRACE_GETREGS, tid, 0, (int) &regs) < 0)
313
    perror_with_name (_("Couldn't get registers"));
314
 
315
  fill_gregset (regcache, &regs, regno);
316
 
317
  if (ptrace (PTRACE_SETREGS, tid, 0, (int) &regs) < 0)
318
    perror_with_name (_("Couldn't write registers"));
319
}
320
 
321
#else
322
 
323
static void fetch_regs (struct regcache *regcache, int tid) {}
324
static void store_regs (const struct regcache *regcache, int tid, int regno) {}
325
 
326
#endif
327
 
328
 
329
/* Transfering floating-point registers between GDB, inferiors and cores.  */
330
 
331
/* What is the address of fpN within the floating-point register set F?  */
332
#define FPREG_ADDR(f, n) (&(f)->fpregs[(n) * 3])
333
 
334
/* Fill GDB's register array with the floating-point register values in
335
   *FPREGSETP.  */
336
 
337
void
338
supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp)
339
{
340
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
341
  int regi;
342
 
343
  for (regi = gdbarch_fp0_regnum (gdbarch);
344
       regi < gdbarch_fp0_regnum (gdbarch) + 8; regi++)
345
    regcache_raw_supply (regcache, regi,
346
                         FPREG_ADDR (fpregsetp,
347
                                     regi - gdbarch_fp0_regnum (gdbarch)));
348
  regcache_raw_supply (regcache, M68K_FPC_REGNUM, &fpregsetp->fpcntl[0]);
349
  regcache_raw_supply (regcache, M68K_FPS_REGNUM, &fpregsetp->fpcntl[1]);
350
  regcache_raw_supply (regcache, M68K_FPI_REGNUM, &fpregsetp->fpcntl[2]);
351
}
352
 
353
/* Fill register REGNO (if it is a floating-point register) in
354
   *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
355
   do this for all registers.  */
356
 
357
void
358
fill_fpregset (const struct regcache *regcache,
359
               elf_fpregset_t *fpregsetp, int regno)
360
{
361
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
362
  int i;
363
 
364
  /* Fill in the floating-point registers.  */
365
  for (i = gdbarch_fp0_regnum (gdbarch);
366
       i < gdbarch_fp0_regnum (gdbarch) + 8; i++)
367
    if (regno == -1 || regno == i)
368
      regcache_raw_collect (regcache, i,
369
                            FPREG_ADDR (fpregsetp,
370
                                        i - gdbarch_fp0_regnum (gdbarch)));
371
 
372
  /* Fill in the floating-point control registers.  */
373
  for (i = M68K_FPC_REGNUM; i <= M68K_FPI_REGNUM; i++)
374
    if (regno == -1 || regno == i)
375
      regcache_raw_collect (regcache, i,
376
                            &fpregsetp->fpcntl[i - M68K_FPC_REGNUM]);
377
}
378
 
379
#ifdef HAVE_PTRACE_GETREGS
380
 
381
/* Fetch all floating-point registers from process/thread TID and store
382
   thier values in GDB's register array.  */
383
 
384
static void
385
fetch_fpregs (struct regcache *regcache, int tid)
386
{
387
  elf_fpregset_t fpregs;
388
 
389
  if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
390
    perror_with_name (_("Couldn't get floating point status"));
391
 
392
  supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs);
393
}
394
 
395
/* Store all valid floating-point registers in GDB's register array
396
   into the process/thread specified by TID.  */
397
 
398
static void
399
store_fpregs (const struct regcache *regcache, int tid, int regno)
400
{
401
  elf_fpregset_t fpregs;
402
 
403
  if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
404
    perror_with_name (_("Couldn't get floating point status"));
405
 
406
  fill_fpregset (regcache, &fpregs, regno);
407
 
408
  if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0)
409
    perror_with_name (_("Couldn't write floating point status"));
410
}
411
 
412
#else
413
 
414
static void fetch_fpregs (struct regcache *regcache, int tid) {}
415
static void store_fpregs (const struct regcache *regcache, int tid, int regno) {}
416
 
417
#endif
418
 
419
/* Transferring arbitrary registers between GDB and inferior.  */
420
 
421
/* Fetch register REGNO from the child process.  If REGNO is -1, do
422
   this for all registers (including the floating point and SSE
423
   registers).  */
424
 
425
static void
426
m68k_linux_fetch_inferior_registers (struct regcache *regcache, int regno)
427
{
428
  int tid;
429
 
430
  /* Use the old method of peeking around in `struct user' if the
431
     GETREGS request isn't available.  */
432
  if (! have_ptrace_getregs)
433
    {
434
      old_fetch_inferior_registers (regcache, regno);
435
      return;
436
    }
437
 
438
  /* GNU/Linux LWP ID's are process ID's.  */
439
  tid = TIDGET (inferior_ptid);
440
  if (tid == 0)
441
    tid = PIDGET (inferior_ptid);               /* Not a threaded program.  */
442
 
443
  /* Use the PTRACE_GETFPXREGS request whenever possible, since it
444
     transfers more registers in one system call, and we'll cache the
445
     results.  But remember that fetch_fpxregs can fail, and return
446
     zero.  */
447
  if (regno == -1)
448
    {
449
      fetch_regs (regcache, tid);
450
 
451
      /* The call above might reset `have_ptrace_getregs'.  */
452
      if (! have_ptrace_getregs)
453
        {
454
          old_fetch_inferior_registers (regcache, -1);
455
          return;
456
        }
457
 
458
      fetch_fpregs (regcache, tid);
459
      return;
460
    }
461
 
462
  if (getregs_supplies (regno))
463
    {
464
      fetch_regs (regcache, tid);
465
      return;
466
    }
467
 
468
  if (getfpregs_supplies (regno))
469
    {
470
      fetch_fpregs (regcache, tid);
471
      return;
472
    }
473
 
474
  internal_error (__FILE__, __LINE__,
475
                  _("Got request for bad register number %d."), regno);
476
}
477
 
478
/* Store register REGNO back into the child process.  If REGNO is -1,
479
   do this for all registers (including the floating point and SSE
480
   registers).  */
481
static void
482
m68k_linux_store_inferior_registers (struct regcache *regcache, int regno)
483
{
484
  int tid;
485
 
486
  /* Use the old method of poking around in `struct user' if the
487
     SETREGS request isn't available.  */
488
  if (! have_ptrace_getregs)
489
    {
490
      old_store_inferior_registers (regcache, regno);
491
      return;
492
    }
493
 
494
  /* GNU/Linux LWP ID's are process ID's.  */
495
  tid = TIDGET (inferior_ptid);
496
  if (tid == 0)
497
    tid = PIDGET (inferior_ptid);       /* Not a threaded program.  */
498
 
499
  /* Use the PTRACE_SETFPREGS requests whenever possible, since it
500
     transfers more registers in one system call.  But remember that
501
     store_fpregs can fail, and return zero.  */
502
  if (regno == -1)
503
    {
504
      store_regs (regcache, tid, regno);
505
      store_fpregs (regcache, tid, regno);
506
      return;
507
    }
508
 
509
  if (getregs_supplies (regno))
510
    {
511
      store_regs (regcache, tid, regno);
512
      return;
513
    }
514
 
515
  if (getfpregs_supplies (regno))
516
    {
517
      store_fpregs (regcache, tid, regno);
518
      return;
519
    }
520
 
521
  internal_error (__FILE__, __LINE__,
522
                  _("Got request to store bad register number %d."), regno);
523
}
524
 
525
/* Interpreting register set info found in core files.  */
526
 
527
/* Provide registers to GDB from a core file.
528
 
529
   (We can't use the generic version of this function in
530
   core-regset.c, because we need to use elf_gregset_t instead of
531
   gregset_t.)
532
 
533
   CORE_REG_SECT points to an array of bytes, which are the contents
534
   of a `note' from a core file which BFD thinks might contain
535
   register contents.  CORE_REG_SIZE is its size.
536
 
537
   WHICH says which register set corelow suspects this is:
538
 
539
     2 --- the floating-point register set, in elf_fpregset_t format
540
 
541
   REG_ADDR isn't used on GNU/Linux.  */
542
 
543
static void
544
fetch_core_registers (struct regcache *regcache,
545
                      char *core_reg_sect, unsigned core_reg_size,
546
                      int which, CORE_ADDR reg_addr)
547
{
548
  elf_gregset_t gregset;
549
  elf_fpregset_t fpregset;
550
 
551
  switch (which)
552
    {
553
    case 0:
554
      if (core_reg_size != sizeof (gregset))
555
        warning (_("Wrong size gregset in core file."));
556
      else
557
        {
558
          memcpy (&gregset, core_reg_sect, sizeof (gregset));
559
          supply_gregset (regcache, (const elf_gregset_t *) &gregset);
560
        }
561
      break;
562
 
563
    case 2:
564
      if (core_reg_size != sizeof (fpregset))
565
        warning (_("Wrong size fpregset in core file."));
566
      else
567
        {
568
          memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
569
          supply_fpregset (regcache, (const elf_fpregset_t *) &fpregset);
570
        }
571
      break;
572
 
573
    default:
574
      /* We've covered all the kinds of registers we know about here,
575
         so this must be something we wouldn't know what to do with
576
         anyway.  Just ignore it.  */
577
      break;
578
    }
579
}
580
 
581
 
582
/* Register that we are able to handle GNU/Linux ELF core file
583
   formats.  */
584
 
585
static struct core_fns linux_elf_core_fns =
586
{
587
  bfd_target_elf_flavour,               /* core_flavour */
588
  default_check_format,                 /* check_format */
589
  default_core_sniffer,                 /* core_sniffer */
590
  fetch_core_registers,                 /* core_read_registers */
591
  NULL                                  /* next */
592
};
593
 
594
void _initialize_m68k_linux_nat (void);
595
 
596
void
597
_initialize_m68k_linux_nat (void)
598
{
599
  struct target_ops *t;
600
 
601
  /* Fill in the generic GNU/Linux methods.  */
602
  t = linux_target ();
603
 
604
  /* Add our register access methods.  */
605
  t->to_fetch_registers = m68k_linux_fetch_inferior_registers;
606
  t->to_store_registers = m68k_linux_store_inferior_registers;
607
 
608
  /* Register the target.  */
609
  linux_nat_add_target (t);
610
 
611
  deprecated_add_core_fns (&linux_elf_core_fns);
612
}

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