summaryrefslogtreecommitdiffstats
path: root/c/src/libmisc/stackchk/check.c
blob: c0f1cca9929695f7635e9f81b723f2c18eea9034 (plain) (blame)
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
/*
 *  Stack Overflow Check User Extension Set
 *
 *  NOTE:  This extension set automatically determines at
 *         initialization time whether the stack for this
 *         CPU grows up or down and installs the correct
 *         extension routines for that direction.
 *
 *  COPYRIGHT (c) 1989-1999.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  $Id$
 *
 */

#include <rtems.h>

/*
 * HACK
 * the stack dump information should be printed by a "fatal" extension.
 * Fatal extensions only get called via rtems_fatal_error_occurred()
 * and not when rtems_shutdown_executive() is called.
 * I hope/think this is changing so that fatal extensions are renamed
 * to "shutdown" extensions.
 * When that happens, this #define should be deleted and all the code
 * it marks.
 */
#define DONT_USE_FATAL_EXTENSION

#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include <rtems/stackchk.h>
#include "internal.h"

/*
 *  This variable contains the name of the task which "blew" the stack.
 *  It is NULL if the system is all right.
 */

Thread_Control *Stack_check_Blown_task;

/*
 *  The extension table for the stack checker.
 */

rtems_extensions_table Stack_check_Extension_table = {
  Stack_check_Create_extension,     /* rtems_task_create  */
  0,                                /* rtems_task_start   */
  0,                                /* rtems_task_restart */
  0,                                /* rtems_task_delete  */
  Stack_check_Switch_extension,     /* task_switch  */
  Stack_check_Begin_extension,      /* task_begin   */
  0,                                /* task_exitted */
#ifdef DONT_USE_FATAL_EXTENSION
  0,                                /* fatal        */
#else
  Stack_check_Fatal_extension,      /* fatal        */
#endif
};

/*
 *  The "magic pattern" used to mark the end of the stack.
 */

Stack_check_Control Stack_check_Pattern;

/*
 *  Where the pattern goes in the stack area is dependent upon
 *  whether the stack grow to the high or low area of the memory.
 *
 */

#if ( CPU_STACK_GROWS_UP == TRUE )

#define Stack_check_Get_pattern_area( _the_stack ) \
  ((Stack_check_Control *) ((char *)(_the_stack)->area + \
       (_the_stack)->size - sizeof( Stack_check_Control ) ))

#define Stack_check_Calculate_used( _low, _size, _high_water ) \
    ((char *)(_high_water) - (char *)(_low))

#define Stack_check_usable_stack_start(_the_stack) \
    ((_the_stack)->area)

#else

#define Stack_check_Get_pattern_area( _the_stack ) \
  ((Stack_check_Control *) ((char *)(_the_stack)->area + HEAP_OVERHEAD))

#define Stack_check_Calculate_used( _low, _size, _high_water) \
    ( ((char *)(_low) + (_size)) - (char *)(_high_water) )

#define Stack_check_usable_stack_start(_the_stack) \
    ((char *)(_the_stack)->area + sizeof(Stack_check_Control))

#endif

#define Stack_check_usable_stack_size(_the_stack) \
    ((_the_stack)->size - sizeof(Stack_check_Control))


/*
 * Do we have an interrupt stack?
 * XXX it would sure be nice if the interrupt stack were also
 *     stored in a "stack" structure!
 */


Stack_Control stack_check_interrupt_stack;

/*
 * Prototypes necessary for forward references
 */

void Stack_check_Dump_usage( void );

/*
 * Fill an entire stack area with BYTE_PATTERN.
 * This will be used by a Fatal extension to check for
 * amount of actual stack used
 */

void
stack_check_dope_stack(Stack_Control *stack)
{
    memset(stack->area, BYTE_PATTERN, stack->size);
}


/*PAGE
 *
 *  Stack_check_Initialize
 */

unsigned32 stack_check_initialized = 0;

void Stack_check_Initialize( void )
{
#if 0
  rtems_status_code    status;
  Objects_Id           id_ignored;
#endif
  unsigned32          *p;
#if 0
  unsigned32           i;
  unsigned32           api_index;
  Thread_Control      *the_thread;
  Objects_Information *information;
#endif

  if (stack_check_initialized)
      return;

  /*
   * Dope the pattern and fill areas
   */

  for ( p = Stack_check_Pattern.pattern;
        p < &Stack_check_Pattern.pattern[PATTERN_SIZE_WORDS];
        p += 4
      )
  {
      p[0] = 0xFEEDF00D;          /* FEED FOOD to BAD DOG */
      p[1] = 0x0BAD0D06;
      p[2] = 0xDEADF00D;          /* DEAD FOOD GOOD DOG */
      p[3] = 0x600D0D06;
  };

#if 0
  status = rtems_extension_create(
    rtems_build_name( 'S', 'T', 'C', 'K' ),
    &Stack_check_Extension_table,
    &id_ignored
  );
  assert ( status == RTEMS_SUCCESSFUL );
#endif

  Stack_check_Blown_task = 0;

  /*
   * If installed by a task, that task will not get setup properly
   * since it missed out on the create hook.  This will cause a
   * failure on first switch out of that task.
   * So pretend here that we actually ran create and begin extensions.
   */

  /* XXX
   *
   *  Technically this has not been done for any task created before this
   *  happened.  So just run through them and fix the situation.
   */
#if 0
  if (_Thread_Executing)
  {
      Stack_check_Create_extension(_Thread_Executing, _Thread_Executing);
  }
#endif

#if 0
  for ( api_index = 1;
        api_index <= OBJECTS_APIS_LAST ;
        api_index++ ) {
    if ( !_Objects_Information_table[ api_index ] )
      continue;
    information = _Objects_Information_table[ api_index ][ 1 ];
    if ( information ) {
      for ( i=1 ; i <= information->maximum ; i++ ) {
        the_thread = (Thread_Control *)information->local_table[ i ];
        Stack_check_Create_extension( the_thread, the_thread );
      }
    }
  }
#endif

  /*
   * If appropriate, setup the interrupt stack for high water testing
   * also.
   */
#if (CPU_ALLOCATE_INTERRUPT_STACK == TRUE)
  if (_CPU_Interrupt_stack_low && _CPU_Interrupt_stack_high)
  {
      stack_check_interrupt_stack.area = _CPU_Interrupt_stack_low;
      stack_check_interrupt_stack.size = (char *) _CPU_Interrupt_stack_high -
                                              (char *) _CPU_Interrupt_stack_low;

      stack_check_dope_stack(&stack_check_interrupt_stack);
  }
#endif

#ifdef DONT_USE_FATAL_EXTENSION
#ifdef RTEMS_DEBUG
    /*
     * this would normally be called by a fatal extension
     * handler, but we don't run fatal extensions unless
     * we fatal error.
     */
  atexit(Stack_check_Dump_usage);
#endif
#endif

  stack_check_initialized = 1;
}

/*PAGE
 *
 *  Stack_check_Create_extension
 */

boolean Stack_check_Create_extension(
  Thread_Control *running,
  Thread_Control *the_thread
)
{
    if (!stack_check_initialized)
      Stack_check_Initialize();

    if (the_thread /* XXX && (the_thread != _Thread_Executing) */ )
        stack_check_dope_stack(&the_thread->Start.Initial_stack);

    return TRUE;
}

/*PAGE
 *
 *  Stack_check_Begin_extension
 */

void Stack_check_Begin_extension(
  Thread_Control *the_thread
)
{
  Stack_check_Control  *the_pattern;

  if (!stack_check_initialized)
    Stack_check_Initialize();

  if ( the_thread->Object.id == 0 )        /* skip system tasks */
    return;

  the_pattern = Stack_check_Get_pattern_area(&the_thread->Start.Initial_stack);

  *the_pattern = Stack_check_Pattern;
}

/*PAGE
 *
 *  Stack_check_report_blown_task
 *  Report a blown stack.  Needs to be a separate routine
 *  so that interrupt handlers can use this too.
 *
 *  Caller must have set the Stack_check_Blown_task.
 *
 *  NOTE: The system is in a questionable state... we may not get
 *        the following message out.
 */

void Stack_check_report_blown_task(void)
{
    Stack_Control *stack;
    Thread_Control *running;

    running = Stack_check_Blown_task;
    stack = &running->Start.Initial_stack;

    fprintf(
        stderr,
        "BLOWN STACK!!! Offending task(%p): id=0x%08x; name=0x%08x",
        running,
        running->Object.id,
        (unsigned32)running->Object.name
    );
    fflush(stderr);

    if (rtems_configuration_get_user_multiprocessing_table())
        fprintf(
          stderr,
          "; node=%d\n",
          rtems_configuration_get_user_multiprocessing_table()->node
       );
    else
        fprintf(stderr, "\n");
    fflush(stderr);

    fprintf(
        stderr,
        "  stack covers range 0x%08x - 0x%08x (%d bytes)\n",
        (unsigned32) stack->area,
        (unsigned32) stack->area + stack->size - 1,
        (unsigned32) stack->size);
    fflush(stderr);

    fprintf(
        stderr,
        "  Damaged pattern begins at 0x%08lx and is %ld bytes long\n",
        (unsigned long) Stack_check_Get_pattern_area(stack),
        (long) PATTERN_SIZE_BYTES);
    fflush(stderr);

    rtems_fatal_error_occurred( (unsigned32) "STACK BLOWN" );
}

/*PAGE
 *
 *  Stack_check_Switch_extension
 */

void Stack_check_Switch_extension(
  Thread_Control *running,
  Thread_Control *heir
)
{
  if ( running->Object.id == 0 )        /* skip system tasks */
    return;

  if (0 != memcmp( (void *) Stack_check_Get_pattern_area( &running->Start.Initial_stack)->pattern,
                  (void *) Stack_check_Pattern.pattern,
                  PATTERN_SIZE_BYTES))
  {
      Stack_check_Blown_task = running;
      Stack_check_report_blown_task();
  }
}

void *Stack_check_find_high_water_mark(
  const void *s,
  size_t n
)
{
  const unsigned32 *base, *ebase;
  unsigned32 length;

  base = s;
  length = n/4;

#if ( CPU_STACK_GROWS_UP == TRUE )
  /*
   * start at higher memory and find first word that does not
   * match pattern
   */

  base += length - 1;
  for (ebase = s; base > ebase; base--)
      if (*base != U32_PATTERN)
          return (void *) base;
#else
  /*
   * start at lower memory and find first word that does not
   * match pattern
   */

  base += PATTERN_SIZE_WORDS;
  for (ebase = base + length; base < ebase; base++)
      if (*base != U32_PATTERN)
          return (void *) base;
#endif

  return (void *)0;
}

/*PAGE
 *
 *  Stack_check_Dump_threads_usage
 *  Try to print out how much stack was actually used by the task.
 *
 */

void Stack_check_Dump_threads_usage(
  Thread_Control *the_thread
)
{
  unsigned32      size, used;
  void           *low;
  void           *high_water_mark;
  Stack_Control  *stack;
  unsigned32      u32_name;
  char            name_str[5];
  char            *name;
  Objects_Information *info;

  if ( !the_thread )
    return;

  /*
   * XXX HACK to get to interrupt stack
   */

  if (the_thread == (Thread_Control *) -1)
  {
      if (stack_check_interrupt_stack.area)
      {
          stack = &stack_check_interrupt_stack;
          the_thread = 0;
      }
      else
          return;
  }
  else
      stack = &the_thread->Start.Initial_stack;

  low  = Stack_check_usable_stack_start(stack);
  size = Stack_check_usable_stack_size(stack);

  high_water_mark = Stack_check_find_high_water_mark(low, size);

  if ( high_water_mark )
    used = Stack_check_Calculate_used( low, size, high_water_mark );
  else
    used = 0;

  info = _Objects_Get_information(the_thread->Object.id);
  name = name_str;
  if ( the_thread ) {
    if ( info->is_string ) {
      name = (char *) the_thread->Object.name;
    } else {
      u32_name = (unsigned32 *)the_thread->Object.name;
      name[ 0 ] = (u32_name >> 24) & 0xff;
      name[ 1 ] = (u32_name >> 16) & 0xff;
      name[ 2 ] = (u32_name >>  8) & 0xff;
      name[ 3 ] = (u32_name >>  0) & 0xff;
      name[ 4 ] = '\0';
    }
  } else {
    u32_name = rtems_build_name('I', 'N', 'T', 'R');
    name[ 0 ] = (u32_name >> 24) & 0xff;
    name[ 1 ] = (u32_name >> 16) & 0xff;
    name[ 2 ] = (u32_name >>  8) & 0xff;
    name[ 3 ] = (u32_name >>  0) & 0xff;
    name[ 4 ] = '\0';
  }

  printf( "0x%08x  %4s  0x%08x  0x%08x   %8d   %8d\n",
          the_thread ? the_thread->Object.id : ~0,
          name,
          (unsigned32) stack->area,
          (unsigned32) stack->area + (unsigned32) stack->size - 1,
          size,
          used
  );
}

/*PAGE
 *
 *  Stack_check_Fatal_extension
 */

void Stack_check_Fatal_extension(
    Internal_errors_Source  source,
    boolean                 is_internal,
    unsigned32              status
)
{
#ifndef DONT_USE_FATAL_EXTENSION
    if (status == 0)
        Stack_check_Dump_usage();
#endif
}


/*PAGE
 *
 *  Stack_check_Dump_usage
 */

void Stack_check_Dump_usage( void )
{
  unsigned32           i;
  unsigned32           api_index;
  Thread_Control      *the_thread;
  unsigned32           hit_running = 0;
  Objects_Information *information;

  if (stack_check_initialized == 0)
      return;

  printf("Stack usage by thread\n");
  printf(
    "    ID      NAME       LOW        HIGH     AVAILABLE      USED\n"
  );

  for ( api_index = 1 ; 
        api_index <= OBJECTS_APIS_LAST ; 
        api_index++ ) {
    if ( !_Objects_Information_table[ api_index ] )
      continue;
    information = _Objects_Information_table[ api_index ][ 1 ];
    if ( information ) {
      for ( i=1 ; i <= information->maximum ; i++ ) {
        the_thread = (Thread_Control *)information->local_table[ i ];
        Stack_check_Dump_threads_usage( the_thread );
        if ( the_thread == _Thread_Executing )
          hit_running = 1;
      }
    }
  }

  if ( !hit_running )
    Stack_check_Dump_threads_usage( _Thread_Executing );

  /* dump interrupt stack info if any */
  Stack_check_Dump_threads_usage((Thread_Control *) -1);
}