aboutsummaryrefslogtreecommitdiff
path: root/gdb/arm-linux-nat.c
blob: 7c8e04b18858d309d80a9fdc66f1d335d27dd547 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
/* GNU/Linux on ARM native support.
   Copyright 1999, 2000 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "inferior.h"
#include "gdbcore.h"
#include "gdb_string.h"

#include <sys/user.h>
#include <sys/ptrace.h>
#include <sys/utsname.h>
#include <sys/procfs.h>

/* Prototypes for supply_gregset etc. */
#include "gregset.h"

extern int arm_apcs_32;

#define		typeNone		0x00
#define		typeSingle		0x01
#define		typeDouble		0x02
#define		typeExtended		0x03
#define 	FPWORDS			28
#define		CPSR_REGNUM		16

typedef union tagFPREG
  {
    unsigned int fSingle;
    unsigned int fDouble[2];
    unsigned int fExtended[3];
  }
FPREG;

typedef struct tagFPA11
  {
    FPREG fpreg[8];		/* 8 floating point registers */
    unsigned int fpsr;		/* floating point status register */
    unsigned int fpcr;		/* floating point control register */
    unsigned char fType[8];	/* type of floating point value held in
				   floating point registers.  */
    int initflag;		/* NWFPE initialization flag.  */
  }
FPA11;

/* The following variables are used to determine the version of the
   underlying Linux operating system.  Examples:

   Linux 2.0.35                 Linux 2.2.12
   os_version = 0x00020023      os_version = 0x0002020c
   os_major = 2                 os_major = 2
   os_minor = 0                 os_minor = 2
   os_release = 35              os_release = 12

   Note: os_version = (os_major << 16) | (os_minor << 8) | os_release

   These are initialized using get_linux_version() from
   _initialize_arm_linux_nat().  */

static unsigned int os_version, os_major, os_minor, os_release;

/* On Linux, threads are implemented as pseudo-processes, in which
   case we may be tracing more than one process at a time.  In that
   case, inferior_pid will contain the main process ID and the
   individual thread (process) ID mashed together.  These macros are
   used to separate them out.  These definitions should be overridden
   if thread support is included.  */

#if !defined (PIDGET)	/* Default definition for PIDGET/TIDGET.  */
#define PIDGET(PID)	PID
#define TIDGET(PID)	0
#endif

int
get_thread_id (int inferior_pid)
{
  int tid = TIDGET (inferior_pid);
  if (0 == tid) tid = inferior_pid;
  return tid;
}
#define GET_THREAD_ID(PID)	get_thread_id ((PID));

static void
fetch_nwfpe_single (unsigned int fn, FPA11 * fpa11)
{
  unsigned int mem[3];

  mem[0] = fpa11->fpreg[fn].fSingle;
  mem[1] = 0;
  mem[2] = 0;
  supply_register (F0_REGNUM + fn, (char *) &mem[0]);
}

static void
fetch_nwfpe_double (unsigned int fn, FPA11 * fpa11)
{
  unsigned int mem[3];

  mem[0] = fpa11->fpreg[fn].fDouble[1];
  mem[1] = fpa11->fpreg[fn].fDouble[0];
  mem[2] = 0;
  supply_register (F0_REGNUM + fn, (char *) &mem[0]);
}

static void
fetch_nwfpe_none (unsigned int fn)
{
  unsigned int mem[3] =
  {0, 0, 0};

  supply_register (F0_REGNUM + fn, (char *) &mem[0]);
}

static void
fetch_nwfpe_extended (unsigned int fn, FPA11 * fpa11)
{
  unsigned int mem[3];

  mem[0] = fpa11->fpreg[fn].fExtended[0];	/* sign & exponent */
  mem[1] = fpa11->fpreg[fn].fExtended[2];	/* ls bits */
  mem[2] = fpa11->fpreg[fn].fExtended[1];	/* ms bits */
  supply_register (F0_REGNUM + fn, (char *) &mem[0]);
}

static void
fetch_nwfpe_register (int regno, FPA11 * fpa11)
{
   int fn = regno - F0_REGNUM;

   switch (fpa11->fType[fn])
     {
     case typeSingle:
       fetch_nwfpe_single (fn, fpa11);
       break;

     case typeDouble:
       fetch_nwfpe_double (fn, fpa11);
       break;

     case typeExtended:
       fetch_nwfpe_extended (fn, fpa11);
       break;

     default:
       fetch_nwfpe_none (fn);
     }
}

static void
store_nwfpe_single (unsigned int fn, FPA11 * fpa11)
{
  unsigned int mem[3];

  read_register_gen (F0_REGNUM + fn, (char *) &mem[0]);
  fpa11->fpreg[fn].fSingle = mem[0];
  fpa11->fType[fn] = typeSingle;
}

static void
store_nwfpe_double (unsigned int fn, FPA11 * fpa11)
{
  unsigned int mem[3];

  read_register_gen (F0_REGNUM + fn, (char *) &mem[0]);
  fpa11->fpreg[fn].fDouble[1] = mem[0];
  fpa11->fpreg[fn].fDouble[0] = mem[1];
  fpa11->fType[fn] = typeDouble;
}

void
store_nwfpe_extended (unsigned int fn, FPA11 * fpa11)
{
  unsigned int mem[3];

  read_register_gen (F0_REGNUM + fn, (char *) &mem[0]);
  fpa11->fpreg[fn].fExtended[0] = mem[0];	/* sign & exponent */
  fpa11->fpreg[fn].fExtended[2] = mem[1];	/* ls bits */
  fpa11->fpreg[fn].fExtended[1] = mem[2];	/* ms bits */
  fpa11->fType[fn] = typeDouble;
}

void
store_nwfpe_register (int regno, FPA11 * fpa11)
{
  if (register_valid[regno])
    {
       unsigned int fn = regno - F0_REGNUM;
       switch (fpa11->fType[fn])
         {
	 case typeSingle:
	   store_nwfpe_single (fn, fpa11);
	   break;

	 case typeDouble:
	   store_nwfpe_double (fn, fpa11);
	   break;

	 case typeExtended:
	   store_nwfpe_extended (fn, fpa11);
	   break;
	 }
    }
}


/* Get the value of a particular register from the floating point
   state of the process and store it into registers[].  */

static void
fetch_fpregister (int regno)
{
  int ret, tid;
  FPA11 fp;
  
  /* Get the thread id for the ptrace call.  */
  tid = GET_THREAD_ID (inferior_pid);

  /* Read the floating point state.  */
  ret = ptrace (PT_GETFPREGS, tid, 0, &fp);
  if (ret < 0)
    {
      warning ("Unable to fetch floating point register.");
      return;
    }

  /* Fetch fpsr.  */
  if (FPS_REGNUM == regno)
    supply_register (FPS_REGNUM, (char *) &fp.fpsr);

  /* Fetch the floating point register.  */
  if (regno >= F0_REGNUM && regno <= F7_REGNUM)
    {
      int fn = regno - F0_REGNUM;

      switch (fp.fType[fn])
	{
	case typeSingle:
	  fetch_nwfpe_single (fn, &fp);
	  break;

	case typeDouble:
	    fetch_nwfpe_double (fn, &fp);
	  break;

	case typeExtended:
	    fetch_nwfpe_extended (fn, &fp);
	  break;

	default:
	    fetch_nwfpe_none (fn);
	}
    }
}

/* Get the whole floating point state of the process and store it
   into registers[].  */

static void
fetch_fpregs (void)
{
  int ret, regno, tid;
  FPA11 fp;

  /* Get the thread id for the ptrace call.  */
  tid = GET_THREAD_ID (inferior_pid);
  
  /* Read the floating point state.  */
  ret = ptrace (PT_GETFPREGS, tid, 0, &fp);
  if (ret < 0)
    {
      warning ("Unable to fetch the floating point registers.");
      return;
    }

  /* Fetch fpsr.  */
  supply_register (FPS_REGNUM, (char *) &fp.fpsr);

  /* Fetch the floating point registers.  */
  for (regno = F0_REGNUM; regno <= F7_REGNUM; regno++)
    {
      int fn = regno - F0_REGNUM;

      switch (fp.fType[fn])
	{
	case typeSingle:
	  fetch_nwfpe_single (fn, &fp);
	  break;

	case typeDouble:
	  fetch_nwfpe_double (fn, &fp);
	  break;

	case typeExtended:
	  fetch_nwfpe_extended (fn, &fp);
	  break;

	default:
	  fetch_nwfpe_none (fn);
	}
    }
}

/* Save a particular register into the floating point state of the
   process using the contents from registers[].  */

static void
store_fpregister (int regno)
{
  int ret, tid;
  FPA11 fp;

  /* Get the thread id for the ptrace call.  */
  tid = GET_THREAD_ID (inferior_pid);
  
  /* Read the floating point state.  */
  ret = ptrace (PT_GETFPREGS, tid, 0, &fp);
  if (ret < 0)
    {
      warning ("Unable to fetch the floating point registers.");
      return;
    }

  /* Store fpsr.  */
  if (FPS_REGNUM == regno && register_valid[FPS_REGNUM])
    read_register_gen (FPS_REGNUM, (char *) &fp.fpsr);

  /* Store the floating point register.  */
  if (regno >= F0_REGNUM && regno <= F7_REGNUM)
    {
      store_nwfpe_register (regno, &fp);
    }

  ret = ptrace (PTRACE_SETFPREGS, tid, 0, &fp);
  if (ret < 0)
    {
      warning ("Unable to store floating point register.");
      return;
    }
}

/* Save the whole floating point state of the process using
   the contents from registers[].  */

static void
store_fpregs (void)
{
  int ret, regno, tid;
  FPA11 fp;

  /* Get the thread id for the ptrace call.  */
  tid = GET_THREAD_ID (inferior_pid);
  
  /* Read the floating point state.  */
  ret = ptrace (PT_GETFPREGS, tid, 0, &fp);
  if (ret < 0)
    {
      warning ("Unable to fetch the floating point registers.");
      return;
    }

  /* Store fpsr.  */
  if (register_valid[FPS_REGNUM])
    read_register_gen (FPS_REGNUM, (char *) &fp.fpsr);

  /* Store the floating point registers.  */
  for (regno = F0_REGNUM; regno <= F7_REGNUM; regno++)
    {
      fetch_nwfpe_register (regno, &fp);
    }

  ret = ptrace (PTRACE_SETFPREGS, tid, 0, &fp);
  if (ret < 0)
    {
      warning ("Unable to store floating point registers.");
      return;
    }
}

/* Fetch a general register of the process and store into
   registers[].  */

static void
fetch_register (int regno)
{
  int ret, tid;
  struct pt_regs regs;

  /* Get the thread id for the ptrace call.  */
  tid = GET_THREAD_ID (inferior_pid);
  
  ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);
  if (ret < 0)
    {
      warning ("Unable to fetch general register.");
      return;
    }

  if (regno >= A1_REGNUM && regno < PC_REGNUM)
    supply_register (regno, (char *) &regs.uregs[regno]);

  if (PS_REGNUM == regno)
    {
      if (arm_apcs_32)
        supply_register (PS_REGNUM, (char *) &regs.uregs[CPSR_REGNUM]);
      else
        supply_register (PS_REGNUM, (char *) &regs.uregs[PC_REGNUM]);
    }
    
  if (PC_REGNUM == regno)
    { 
      regs.uregs[PC_REGNUM] = ADDR_BITS_REMOVE (regs.uregs[PC_REGNUM]);
      supply_register (PC_REGNUM, (char *) &regs.uregs[PC_REGNUM]);
    }
}

/* Fetch all general registers of the process and store into
   registers[].  */

static void
fetch_regs (void)
{
  int ret, regno, tid;
  struct pt_regs regs;

  /* Get the thread id for the ptrace call.  */
  tid = GET_THREAD_ID (inferior_pid);
  
  ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);
  if (ret < 0)
    {
      warning ("Unable to fetch general registers.");
      return;
    }

  for (regno = A1_REGNUM; regno < PC_REGNUM; regno++)
    supply_register (regno, (char *) &regs.uregs[regno]);

  if (arm_apcs_32)
    supply_register (PS_REGNUM, (char *) &regs.uregs[CPSR_REGNUM]);
  else
    supply_register (PS_REGNUM, (char *) &regs.uregs[PC_REGNUM]);

  regs.uregs[PC_REGNUM] = ADDR_BITS_REMOVE (regs.uregs[PC_REGNUM]);
  supply_register (PC_REGNUM, (char *) &regs.uregs[PC_REGNUM]);
}

/* Store all general registers of the process from the values in
   registers[].  */

static void
store_register (int regno)
{
  int ret, tid;
  struct pt_regs regs;
  
  if (!register_valid[regno])
    return;

  /* Get the thread id for the ptrace call.  */
  tid = GET_THREAD_ID (inferior_pid);
  
  /* Get the general registers from the process.  */
  ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);
  if (ret < 0)
    {
      warning ("Unable to fetch general registers.");
      return;
    }

  if (regno >= A1_REGNUM && regno <= PC_REGNUM)
    read_register_gen (regno, (char *) &regs.uregs[regno]);

  ret = ptrace (PTRACE_SETREGS, tid, 0, &regs);
  if (ret < 0)
    {
      warning ("Unable to store general register.");
      return;
    }
}

static void
store_regs (void)
{
  int ret, regno, tid;
  struct pt_regs regs;

  /* Get the thread id for the ptrace call.  */
  tid = GET_THREAD_ID (inferior_pid);
  
  /* Fetch the general registers.  */
  ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);
  if (ret < 0)
    {
      warning ("Unable to fetch general registers.");
      return;
    }

  for (regno = A1_REGNUM; regno <= PC_REGNUM; regno++)
    {
      if (register_valid[regno])
	read_register_gen (regno, (char *) &regs.uregs[regno]);
    }

  ret = ptrace (PTRACE_SETREGS, tid, 0, &regs);

  if (ret < 0)
    {
      warning ("Unable to store general registers.");
      return;
    }
}

/* Fetch registers from the child process.  Fetch all registers if
   regno == -1, otherwise fetch all general registers or all floating
   point registers depending upon the value of regno.  */

void
fetch_inferior_registers (int regno)
{
  if (-1 == regno)
    {
      fetch_regs ();
      fetch_fpregs ();
    }
  else 
    {
      if (regno < F0_REGNUM || regno > FPS_REGNUM)
        fetch_register (regno);

      if (regno >= F0_REGNUM && regno <= FPS_REGNUM)
        fetch_fpregister (regno);
    }
}

/* Store registers back into the inferior.  Store all registers if
   regno == -1, otherwise store all general registers or all floating
   point registers depending upon the value of regno.  */

void
store_inferior_registers (int regno)
{
  if (-1 == regno)
    {
      store_regs ();
      store_fpregs ();
    }
  else
    {
      if ((regno < F0_REGNUM) || (regno > FPS_REGNUM))
        store_register (regno);

      if ((regno >= F0_REGNUM) && (regno <= FPS_REGNUM))
        store_fpregister (regno);
    }
}

/* Fill register regno (if it is a general-purpose register) in
   *gregsetp with the appropriate value from GDB's register array.
   If regno is -1, do this for all registers.  */

void
fill_gregset (gregset_t *gregsetp, int regno)
{
  if (-1 == regno)
    {
      int regnum;
      for (regnum = A1_REGNUM; regnum <= PC_REGNUM; regnum++) 
        if (register_valid[regnum])
	  read_register_gen (regnum, (char *) &(*gregsetp)[regnum]);
    }
  else if (regno >= A1_REGNUM && regno <= PC_REGNUM)
    {
      if (register_valid[regno])
	read_register_gen (regno, (char *) &(*gregsetp)[regno]);
    }

  if (PS_REGNUM == regno || -1 == regno)
    {
      if (register_valid[regno] || -1 == regno)
        {
          if (arm_apcs_32)
	    read_register_gen (PS_REGNUM, (char *) &(*gregsetp)[CPSR_REGNUM]);
	  else
	    read_register_gen (PC_REGNUM, (char *) &(*gregsetp)[PC_REGNUM]);
	}
    }
        
}

/* Fill GDB's register array with the general-purpose register values
   in *gregsetp.  */

void
supply_gregset (gregset_t *gregsetp)
{
  int regno, reg_pc;

  for (regno = A1_REGNUM; regno < PC_REGNUM; regno++)
    supply_register (regno, (char *) &(*gregsetp)[regno]);

  if (arm_apcs_32)
    supply_register (PS_REGNUM, (char *) &(*gregsetp)[CPSR_REGNUM]);
  else
    supply_register (PS_REGNUM, (char *) &(*gregsetp)[PC_REGNUM]);

  reg_pc = ADDR_BITS_REMOVE ((CORE_ADDR)(*gregsetp)[PC_REGNUM]);
  supply_register (PC_REGNUM, (char *) &reg_pc);
}

/* Fill register regno (if it is a floating-point register) in
   *fpregsetp with the appropriate value from GDB's register array.
   If regno is -1, do this for all registers.  */

void
fill_fpregset (fpregset_t *fpregsetp, int regno)
{
  FPA11 *fp = (FPA11 *) fpregsetp;
  
  if (-1 == regno)
    {
       int regnum;
       for (regnum = F0_REGNUM; regnum <= F7_REGNUM; regnum++)
         store_nwfpe_register (regnum, fp);
    }
  else if (regno >= F0_REGNUM && regno <= F7_REGNUM)
    {
      store_nwfpe_register (regno, fp);
      return;
    }

  /* Store fpsr.  */
  if (register_valid[FPS_REGNUM])
    if (FPS_REGNUM == regno || -1 == regno)
      read_register_gen (FPS_REGNUM, (char *) &fp->fpsr);
}

/* Fill GDB's register array with the floating-point register values
   in *fpregsetp.  */

void
supply_fpregset (fpregset_t *fpregsetp)
{
  int regno;
  FPA11 *fp = (FPA11 *) fpregsetp;

  /* Fetch fpsr.  */
  supply_register (FPS_REGNUM, (char *) &fp->fpsr);

  /* Fetch the floating point registers.  */
  for (regno = F0_REGNUM; regno <= F7_REGNUM; regno++)
    {
      fetch_nwfpe_register (regno, fp);
    }
}

int
arm_linux_kernel_u_size (void)
{
  return (sizeof (struct user));
}

static unsigned int
get_linux_version (unsigned int *vmajor,
		   unsigned int *vminor,
		   unsigned int *vrelease)
{
  struct utsname info;
  char *pmajor, *pminor, *prelease, *tail;

  if (-1 == uname (&info))
    {
      warning ("Unable to determine Linux version.");
      return -1;
    }

  pmajor = strtok (info.release, ".");
  pminor = strtok (NULL, ".");
  prelease = strtok (NULL, ".");

  *vmajor = (unsigned int) strtoul (pmajor, &tail, 0);
  *vminor = (unsigned int) strtoul (pminor, &tail, 0);
  *vrelease = (unsigned int) strtoul (prelease, &tail, 0);

  return ((*vmajor << 16) | (*vminor << 8) | *vrelease);
}

void
_initialize_arm_linux_nat (void)
{
  os_version = get_linux_version (&os_major, &os_minor, &os_release);
}