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5134 serge 1
// -*- C++ -*- The GNU C++ exception personality routine.
2
// Copyright (C) 2001-2013 Free Software Foundation, Inc.
3
//
4
// This file is part of GCC.
5
//
6
// GCC is free software; you can redistribute it and/or modify
7
// it under the terms of the GNU General Public License as published by
8
// the Free Software Foundation; either version 3, or (at your option)
9
// any later version.
10
//
11
// GCC is distributed in the hope that it will be useful,
12
// but WITHOUT ANY WARRANTY; without even the implied warranty of
13
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14
// GNU General Public License for more details.
15
//
16
// Under Section 7 of GPL version 3, you are granted additional
17
// permissions described in the GCC Runtime Library Exception, version
18
// 3.1, as published by the Free Software Foundation.
19
 
20
// You should have received a copy of the GNU General Public License and
21
// a copy of the GCC Runtime Library Exception along with this program;
22
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
23
// .
24
 
25
#include 
26
#include 
27
#include 
28
#include 
29
#include "unwind-cxx.h"
30
 
31
 
32
using namespace __cxxabiv1;
33
 
34
#include "unwind-pe.h"
35
 
36
 
37
struct lsda_header_info
38
{
39
  _Unwind_Ptr Start;
40
  _Unwind_Ptr LPStart;
41
  _Unwind_Ptr ttype_base;
42
  const unsigned char *TType;
43
  const unsigned char *action_table;
44
  unsigned char ttype_encoding;
45
  unsigned char call_site_encoding;
46
};
47
 
48
static const unsigned char *
49
parse_lsda_header (_Unwind_Context *context, const unsigned char *p,
50
		   lsda_header_info *info)
51
{
52
  _uleb128_t tmp;
53
  unsigned char lpstart_encoding;
54
 
55
  info->Start = (context ? _Unwind_GetRegionStart (context) : 0);
56
 
57
  // Find @LPStart, the base to which landing pad offsets are relative.
58
  lpstart_encoding = *p++;
59
  if (lpstart_encoding != DW_EH_PE_omit)
60
    p = read_encoded_value (context, lpstart_encoding, p, &info->LPStart);
61
  else
62
    info->LPStart = info->Start;
63
 
64
  // Find @TType, the base of the handler and exception spec type data.
65
  info->ttype_encoding = *p++;
66
  if (info->ttype_encoding != DW_EH_PE_omit)
67
    {
68
#if _GLIBCXX_OVERRIDE_TTYPE_ENCODING
69
      /* Older ARM EABI toolchains set this value incorrectly, so use a
70
	 hardcoded OS-specific format.  */
71
      info->ttype_encoding = _GLIBCXX_OVERRIDE_TTYPE_ENCODING;
72
#endif
73
      p = read_uleb128 (p, &tmp);
74
      info->TType = p + tmp;
75
    }
76
  else
77
    info->TType = 0;
78
 
79
  // The encoding and length of the call-site table; the action table
80
  // immediately follows.
81
  info->call_site_encoding = *p++;
82
  p = read_uleb128 (p, &tmp);
83
  info->action_table = p + tmp;
84
 
85
  return p;
86
}
87
 
88
// Return an element from a type table.
89
 
90
static const std::type_info *
91
get_ttype_entry (lsda_header_info *info, _uleb128_t i)
92
{
93
  _Unwind_Ptr ptr;
94
 
95
  i *= size_of_encoded_value (info->ttype_encoding);
96
  read_encoded_value_with_base (info->ttype_encoding, info->ttype_base,
97
				info->TType - i, &ptr);
5963 serge 98
 
5134 serge 99
  return reinterpret_cast(ptr);
100
}
101
 
102
#ifdef __ARM_EABI_UNWINDER__
103
 
104
// The ABI provides a routine for matching exception object types.
105
typedef _Unwind_Control_Block _throw_typet;
106
#define get_adjusted_ptr(catch_type, throw_type, thrown_ptr_p) \
107
  (__cxa_type_match (throw_type, catch_type, false, thrown_ptr_p) \
108
   != ctm_failed)
109
 
110
// Return true if THROW_TYPE matches one if the filter types.
111
 
112
static bool
113
check_exception_spec(lsda_header_info* info, _throw_typet* throw_type,
114
		     void* thrown_ptr, _sleb128_t filter_value)
115
{
116
  const _uleb128_t* e = ((const _uleb128_t*) info->TType)
117
			  - filter_value - 1;
118
 
119
  while (1)
120
    {
121
      const std::type_info* catch_type;
122
      _uleb128_t tmp;
123
 
124
      tmp = *e;
125
 
126
      // Zero signals the end of the list.  If we've not found
127
      // a match by now, then we've failed the specification.
128
      if (tmp == 0)
129
        return false;
130
 
131
      tmp = _Unwind_decode_typeinfo_ptr(info->ttype_base, (_Unwind_Word) e);
132
 
133
      // Match a ttype entry.
134
      catch_type = reinterpret_cast(tmp);
135
 
136
      // ??? There is currently no way to ask the RTTI code about the
137
      // relationship between two types without reference to a specific
138
      // object.  There should be; then we wouldn't need to mess with
139
      // thrown_ptr here.
140
      if (get_adjusted_ptr(catch_type, throw_type, &thrown_ptr))
141
	return true;
142
 
143
      // Advance to the next entry.
144
      e++;
145
    }
146
}
147
 
148
 
149
// Save stage1 handler information in the exception object
150
 
151
static inline void
152
save_caught_exception(struct _Unwind_Exception* ue_header,
153
		      struct _Unwind_Context* context,
154
		      void* thrown_ptr,
155
		      int handler_switch_value,
156
		      const unsigned char* language_specific_data,
157
		      _Unwind_Ptr landing_pad,
158
		      const unsigned char* action_record
159
			__attribute__((__unused__)))
160
{
161
    ue_header->barrier_cache.sp = _Unwind_GetGR(context, UNWIND_STACK_REG);
162
    ue_header->barrier_cache.bitpattern[0] = (_uw) thrown_ptr;
163
    ue_header->barrier_cache.bitpattern[1]
164
      = (_uw) handler_switch_value;
165
    ue_header->barrier_cache.bitpattern[2]
166
      = (_uw) language_specific_data;
167
    ue_header->barrier_cache.bitpattern[3] = (_uw) landing_pad;
168
}
169
 
170
 
171
// Restore the catch handler data saved during phase1.
172
 
173
static inline void
174
restore_caught_exception(struct _Unwind_Exception* ue_header,
175
			 int& handler_switch_value,
176
			 const unsigned char*& language_specific_data,
177
			 _Unwind_Ptr& landing_pad)
178
{
179
  handler_switch_value = (int) ue_header->barrier_cache.bitpattern[1];
180
  language_specific_data =
181
    (const unsigned char*) ue_header->barrier_cache.bitpattern[2];
182
  landing_pad = (_Unwind_Ptr) ue_header->barrier_cache.bitpattern[3];
183
}
184
 
185
#define CONTINUE_UNWINDING \
186
  do								\
187
    {								\
188
      if (__gnu_unwind_frame(ue_header, context) != _URC_OK)	\
189
	return _URC_FAILURE;					\
190
      return _URC_CONTINUE_UNWIND;				\
191
    }								\
192
  while (0)
193
 
194
// Return true if the filter spec is empty, ie throw().
195
 
196
static bool
197
empty_exception_spec (lsda_header_info *info, _Unwind_Sword filter_value)
198
{
199
  const _Unwind_Word* e = ((const _Unwind_Word*) info->TType)
200
			  - filter_value - 1;
201
 
202
  return *e == 0;
203
}
204
 
205
#else
206
typedef const std::type_info _throw_typet;
207
 
208
 
209
// Given the thrown type THROW_TYPE, pointer to a variable containing a
210
// pointer to the exception object THROWN_PTR_P and a type CATCH_TYPE to
211
// compare against, return whether or not there is a match and if so,
212
// update *THROWN_PTR_P.
213
 
214
static bool
215
get_adjusted_ptr (const std::type_info *catch_type,
216
		  const std::type_info *throw_type,
217
		  void **thrown_ptr_p)
218
{
219
  void *thrown_ptr = *thrown_ptr_p;
220
 
221
  // Pointer types need to adjust the actual pointer, not
222
  // the pointer to pointer that is the exception object.
223
  // This also has the effect of passing pointer types
224
  // "by value" through the __cxa_begin_catch return value.
225
  if (throw_type->__is_pointer_p ())
226
    thrown_ptr = *(void **) thrown_ptr;
227
 
228
  if (catch_type->__do_catch (throw_type, &thrown_ptr, 1))
229
    {
230
      *thrown_ptr_p = thrown_ptr;
231
      return true;
232
    }
233
 
234
  return false;
235
}
236
 
237
// Return true if THROW_TYPE matches one if the filter types.
238
 
239
static bool
240
check_exception_spec(lsda_header_info* info, _throw_typet* throw_type,
241
		      void* thrown_ptr, _sleb128_t filter_value)
242
{
243
  const unsigned char *e = info->TType - filter_value - 1;
244
 
245
  while (1)
246
    {
247
      const std::type_info *catch_type;
248
      _uleb128_t tmp;
249
 
250
      e = read_uleb128 (e, &tmp);
251
 
252
      // Zero signals the end of the list.  If we've not found
253
      // a match by now, then we've failed the specification.
254
      if (tmp == 0)
255
        return false;
256
 
257
      // Match a ttype entry.
258
      catch_type = get_ttype_entry (info, tmp);
259
 
260
      // ??? There is currently no way to ask the RTTI code about the
261
      // relationship between two types without reference to a specific
262
      // object.  There should be; then we wouldn't need to mess with
263
      // thrown_ptr here.
264
      if (get_adjusted_ptr (catch_type, throw_type, &thrown_ptr))
265
	return true;
266
    }
267
}
268
 
269
 
270
// Save stage1 handler information in the exception object
271
 
272
static inline void
273
save_caught_exception(struct _Unwind_Exception* ue_header,
274
		      struct _Unwind_Context* context
275
			__attribute__((__unused__)),
276
		      void* thrown_ptr,
277
		      int handler_switch_value,
278
		      const unsigned char* language_specific_data,
279
		      _Unwind_Ptr landing_pad __attribute__((__unused__)),
280
		      const unsigned char* action_record)
281
{
282
  __cxa_exception* xh = __get_exception_header_from_ue(ue_header);
283
 
284
  xh->handlerSwitchValue = handler_switch_value;
285
  xh->actionRecord = action_record;
286
  xh->languageSpecificData = language_specific_data;
287
  xh->adjustedPtr = thrown_ptr;
288
 
289
  // ??? Completely unknown what this field is supposed to be for.
290
  // ??? Need to cache TType encoding base for call_unexpected.
291
  xh->catchTemp = landing_pad;
292
}
293
 
294
 
295
// Restore the catch handler information saved during phase1.
296
 
297
static inline void
298
restore_caught_exception(struct _Unwind_Exception* ue_header,
299
			 int& handler_switch_value,
300
			 const unsigned char*& language_specific_data,
301
			 _Unwind_Ptr& landing_pad)
302
{
303
  __cxa_exception* xh = __get_exception_header_from_ue(ue_header);
304
  handler_switch_value = xh->handlerSwitchValue;
305
  language_specific_data = xh->languageSpecificData;
306
  landing_pad = (_Unwind_Ptr) xh->catchTemp;
307
}
308
 
309
#define CONTINUE_UNWINDING return _URC_CONTINUE_UNWIND
310
 
311
// Return true if the filter spec is empty, ie throw().
312
 
313
static bool
314
empty_exception_spec (lsda_header_info *info, _Unwind_Sword filter_value)
315
{
316
  const unsigned char *e = info->TType - filter_value - 1;
317
  _uleb128_t tmp;
318
 
319
  e = read_uleb128 (e, &tmp);
320
  return tmp == 0;
321
}
322
 
323
#endif // !__ARM_EABI_UNWINDER__
324
 
325
namespace __cxxabiv1
326
{
327
 
328
// Using a different personality function name causes link failures
329
// when trying to mix code using different exception handling models.
330
#ifdef _GLIBCXX_SJLJ_EXCEPTIONS
331
#define PERSONALITY_FUNCTION	__gxx_personality_sj0
332
#define __builtin_eh_return_data_regno(x) x
333
#elif defined(__SEH__) && !defined (_GLIBCXX_SJLJ_EXCEPTIONS)
334
#define PERSONALITY_FUNCTION	__gxx_personality_imp
335
#else
336
#define PERSONALITY_FUNCTION	__gxx_personality_v0
337
#endif
338
 
339
#if defined (__SEH__) && !defined (_GLIBCXX_SJLJ_EXCEPTIONS)
340
static
341
#else
342
extern "C"
343
#endif
344
_Unwind_Reason_Code
345
#ifdef __ARM_EABI_UNWINDER__
346
PERSONALITY_FUNCTION (_Unwind_State state,
347
		      struct _Unwind_Exception* ue_header,
348
		      struct _Unwind_Context* context)
349
#else
350
PERSONALITY_FUNCTION (int version,
351
		      _Unwind_Action actions,
352
		      _Unwind_Exception_Class exception_class,
353
		      struct _Unwind_Exception *ue_header,
354
		      struct _Unwind_Context *context)
355
#endif
356
{
357
  enum found_handler_type
358
  {
359
    found_nothing,
360
    found_terminate,
361
    found_cleanup,
362
    found_handler
363
  } found_type;
364
 
365
  lsda_header_info info;
366
  const unsigned char *language_specific_data;
367
  const unsigned char *action_record;
368
  const unsigned char *p;
369
  _Unwind_Ptr landing_pad, ip;
370
  int handler_switch_value;
371
  void* thrown_ptr = 0;
372
  bool foreign_exception;
373
  int ip_before_insn = 0;
374
 
375
#ifdef __ARM_EABI_UNWINDER__
376
  _Unwind_Action actions;
377
 
378
  switch (state & _US_ACTION_MASK)
379
    {
380
    case _US_VIRTUAL_UNWIND_FRAME:
381
      actions = _UA_SEARCH_PHASE;
382
      break;
383
 
384
    case _US_UNWIND_FRAME_STARTING:
385
      actions = _UA_CLEANUP_PHASE;
386
      if (!(state & _US_FORCE_UNWIND)
387
	  && ue_header->barrier_cache.sp == _Unwind_GetGR(context,
388
							  UNWIND_STACK_REG))
389
	actions |= _UA_HANDLER_FRAME;
390
      break;
391
 
392
    case _US_UNWIND_FRAME_RESUME:
393
      CONTINUE_UNWINDING;
394
      break;
395
 
396
    default:
397
      std::abort();
398
    }
399
  actions |= state & _US_FORCE_UNWIND;
400
 
401
  // We don't know which runtime we're working with, so can't check this.
402
  // However the ABI routines hide this from us, and we don't actually need
403
  // to know.
404
  foreign_exception = false;
405
 
406
  // The dwarf unwinder assumes the context structure holds things like the
407
  // function and LSDA pointers.  The ARM implementation caches these in
408
  // the exception header (UCB).  To avoid rewriting everything we make a
409
  // virtual scratch register point at the UCB.
410
  ip = (_Unwind_Ptr) ue_header;
411
  _Unwind_SetGR(context, UNWIND_POINTER_REG, ip);
412
#else
413
  __cxa_exception* xh = __get_exception_header_from_ue(ue_header);
414
 
415
  // Interface version check.
416
  if (version != 1)
417
    return _URC_FATAL_PHASE1_ERROR;
418
  foreign_exception = !__is_gxx_exception_class(exception_class);
419
#endif
420
 
421
  // Shortcut for phase 2 found handler for domestic exception.
422
  if (actions == (_UA_CLEANUP_PHASE | _UA_HANDLER_FRAME)
423
      && !foreign_exception)
424
    {
425
      restore_caught_exception(ue_header, handler_switch_value,
426
			       language_specific_data, landing_pad);
427
      found_type = (landing_pad == 0 ? found_terminate : found_handler);
428
      goto install_context;
429
    }
430
 
431
  language_specific_data = (const unsigned char *)
432
    _Unwind_GetLanguageSpecificData (context);
433
 
434
  // If no LSDA, then there are no handlers or cleanups.
435
  if (! language_specific_data)
436
    CONTINUE_UNWINDING;
437
 
438
  // Parse the LSDA header.
439
  p = parse_lsda_header (context, language_specific_data, &info);
440
  info.ttype_base = base_of_encoded_value (info.ttype_encoding, context);
441
#ifdef _GLIBCXX_HAVE_GETIPINFO
442
  ip = _Unwind_GetIPInfo (context, &ip_before_insn);
443
#else
444
  ip = _Unwind_GetIP (context);
445
#endif
446
  if (! ip_before_insn)
447
    --ip;
448
  landing_pad = 0;
449
  action_record = 0;
450
  handler_switch_value = 0;
451
 
452
#ifdef _GLIBCXX_SJLJ_EXCEPTIONS
453
  // The given "IP" is an index into the call-site table, with two
454
  // exceptions -- -1 means no-action, and 0 means terminate.  But
455
  // since we're using uleb128 values, we've not got random access
456
  // to the array.
457
  if ((int) ip < 0)
458
    return _URC_CONTINUE_UNWIND;
459
  else if (ip == 0)
460
    {
461
      // Fall through to set found_terminate.
462
    }
463
  else
464
    {
465
      _uleb128_t cs_lp, cs_action;
466
      do
467
	{
468
	  p = read_uleb128 (p, &cs_lp);
469
	  p = read_uleb128 (p, &cs_action);
470
	}
471
      while (--ip);
472
 
473
      // Can never have null landing pad for sjlj -- that would have
474
      // been indicated by a -1 call site index.
475
      landing_pad = cs_lp + 1;
476
      if (cs_action)
477
	action_record = info.action_table + cs_action - 1;
478
      goto found_something;
479
    }
480
#else
481
  // Search the call-site table for the action associated with this IP.
482
  while (p < info.action_table)
483
    {
484
      _Unwind_Ptr cs_start, cs_len, cs_lp;
485
      _uleb128_t cs_action;
486
 
487
      // Note that all call-site encodings are "absolute" displacements.
488
      p = read_encoded_value (0, info.call_site_encoding, p, &cs_start);
489
      p = read_encoded_value (0, info.call_site_encoding, p, &cs_len);
490
      p = read_encoded_value (0, info.call_site_encoding, p, &cs_lp);
491
      p = read_uleb128 (p, &cs_action);
492
 
493
      // The table is sorted, so if we've passed the ip, stop.
494
      if (ip < info.Start + cs_start)
495
	p = info.action_table;
496
      else if (ip < info.Start + cs_start + cs_len)
497
	{
498
	  if (cs_lp)
499
	    landing_pad = info.LPStart + cs_lp;
500
	  if (cs_action)
501
	    action_record = info.action_table + cs_action - 1;
502
	  goto found_something;
503
	}
504
    }
505
#endif // _GLIBCXX_SJLJ_EXCEPTIONS
506
 
507
  // If ip is not present in the table, call terminate.  This is for
508
  // a destructor inside a cleanup, or a library routine the compiler
509
  // was not expecting to throw.
510
  found_type = found_terminate;
511
  goto do_something;
512
 
513
 found_something:
514
  if (landing_pad == 0)
515
    {
516
      // If ip is present, and has a null landing pad, there are
517
      // no cleanups or handlers to be run.
518
      found_type = found_nothing;
519
    }
520
  else if (action_record == 0)
521
    {
522
      // If ip is present, has a non-null landing pad, and a null
523
      // action table offset, then there are only cleanups present.
524
      // Cleanups use a zero switch value, as set above.
525
      found_type = found_cleanup;
526
    }
527
  else
528
    {
529
      // Otherwise we have a catch handler or exception specification.
530
 
531
      _sleb128_t ar_filter, ar_disp;
532
      const std::type_info* catch_type;
533
      _throw_typet* throw_type;
534
      bool saw_cleanup = false;
535
      bool saw_handler = false;
536
 
537
#ifdef __ARM_EABI_UNWINDER__
538
      // ??? How does this work - more importantly, how does it interact with
539
      // dependent exceptions?
540
      throw_type = ue_header;
541
      if (actions & _UA_FORCE_UNWIND)
542
	{
543
	  __GXX_INIT_FORCED_UNWIND_CLASS(ue_header->exception_class);
544
	}
545
      else if (!foreign_exception)
546
	thrown_ptr = __get_object_from_ue (ue_header);
547
#else
548
#ifdef __GXX_RTTI
549
      // During forced unwinding, match a magic exception type.
550
      if (actions & _UA_FORCE_UNWIND)
551
	{
552
	  throw_type = &typeid(abi::__forced_unwind);
553
	}
554
      // With a foreign exception class, there's no exception type.
555
      // ??? What to do about GNU Java and GNU Ada exceptions?
556
      else if (foreign_exception)
557
	{
558
	  throw_type = &typeid(abi::__foreign_exception);
559
	}
560
      else
561
#endif
562
        {
563
          thrown_ptr = __get_object_from_ue (ue_header);
564
          throw_type = __get_exception_header_from_obj
565
            (thrown_ptr)->exceptionType;
566
        }
567
#endif
568
 
569
      while (1)
570
	{
571
	  p = action_record;
572
	  p = read_sleb128 (p, &ar_filter);
573
	  read_sleb128 (p, &ar_disp);
574
 
575
	  if (ar_filter == 0)
576
	    {
577
	      // Zero filter values are cleanups.
578
	      saw_cleanup = true;
579
	    }
580
	  else if (ar_filter > 0)
581
	    {
582
	      // Positive filter values are handlers.
583
	      catch_type = get_ttype_entry (&info, ar_filter);
584
 
585
	      // Null catch type is a catch-all handler; we can catch foreign
586
	      // exceptions with this.  Otherwise we must match types.
587
	      if (! catch_type
588
		  || (throw_type
589
		      && get_adjusted_ptr (catch_type, throw_type,
590
					   &thrown_ptr)))
591
		{
592
		  saw_handler = true;
593
		  break;
594
		}
595
	    }
596
	  else
597
	    {
598
	      // Negative filter values are exception specifications.
599
	      // ??? How do foreign exceptions fit in?  As far as I can
600
	      // see we can't match because there's no __cxa_exception
601
	      // object to stuff bits in for __cxa_call_unexpected to use.
602
	      // Allow them iff the exception spec is non-empty.  I.e.
603
	      // a throw() specification results in __unexpected.
604
	      if ((throw_type
605
		   && !(actions & _UA_FORCE_UNWIND)
606
		   && !foreign_exception)
607
		  ? ! check_exception_spec (&info, throw_type, thrown_ptr,
608
					    ar_filter)
609
		  : empty_exception_spec (&info, ar_filter))
610
		{
611
		  saw_handler = true;
612
		  break;
613
		}
614
	    }
615
 
616
	  if (ar_disp == 0)
617
	    break;
618
	  action_record = p + ar_disp;
619
	}
620
 
621
      if (saw_handler)
622
	{
623
	  handler_switch_value = ar_filter;
624
	  found_type = found_handler;
625
	}
626
      else
627
	found_type = (saw_cleanup ? found_cleanup : found_nothing);
628
    }
629
 
630
 do_something:
631
   if (found_type == found_nothing)
632
     CONTINUE_UNWINDING;
633
 
634
  if (actions & _UA_SEARCH_PHASE)
635
    {
636
      if (found_type == found_cleanup)
637
	CONTINUE_UNWINDING;
638
 
639
      // For domestic exceptions, we cache data from phase 1 for phase 2.
640
      if (!foreign_exception)
641
        {
642
	  save_caught_exception(ue_header, context, thrown_ptr,
643
				handler_switch_value, language_specific_data,
644
				landing_pad, action_record);
645
	}
646
      return _URC_HANDLER_FOUND;
647
    }
648
 
649
 install_context:
650
 
651
  // We can't use any of the cxa routines with foreign exceptions,
652
  // because they all expect ue_header to be a struct __cxa_exception.
653
  // So in that case, call terminate or unexpected directly.
654
  if ((actions & _UA_FORCE_UNWIND)
655
      || foreign_exception)
656
    {
657
      if (found_type == found_terminate)
658
	std::terminate ();
659
      else if (handler_switch_value < 0)
660
	{
661
	  __try
662
	    { std::unexpected (); }
663
	  __catch(...)
664
	    { std::terminate (); }
665
	}
666
    }
667
  else
668
    {
669
      if (found_type == found_terminate)
670
	__cxa_call_terminate(ue_header);
671
 
672
      // Cache the TType base value for __cxa_call_unexpected, as we won't
673
      // have an _Unwind_Context then.
674
      if (handler_switch_value < 0)
675
	{
676
	  parse_lsda_header (context, language_specific_data, &info);
677
	  info.ttype_base = base_of_encoded_value (info.ttype_encoding,
678
						   context);
679
 
680
#ifdef __ARM_EABI_UNWINDER__
681
	  const _Unwind_Word* e;
682
	  _Unwind_Word n;
683
 
684
	  e = ((const _Unwind_Word*) info.TType) - handler_switch_value - 1;
685
	  // Count the number of rtti objects.
686
	  n = 0;
687
	  while (e[n] != 0)
688
	    n++;
689
 
690
	  // Count.
691
	  ue_header->barrier_cache.bitpattern[1] = n;
692
	  // Base
693
	  ue_header->barrier_cache.bitpattern[2] = info.ttype_base;
694
	  // Stride.
695
	  ue_header->barrier_cache.bitpattern[3] = 4;
696
	  // List head.
697
	  ue_header->barrier_cache.bitpattern[4] = (_Unwind_Word) e;
698
#else
699
	  xh->catchTemp = base_of_encoded_value (info.ttype_encoding, context);
700
#endif
701
	}
702
    }
703
 
704
  /* For targets with pointers smaller than the word size, we must extend the
705
     pointer, and this extension is target dependent.  */
706
  _Unwind_SetGR (context, __builtin_eh_return_data_regno (0),
707
		 __builtin_extend_pointer (ue_header));
708
  _Unwind_SetGR (context, __builtin_eh_return_data_regno (1),
709
		 handler_switch_value);
710
  _Unwind_SetIP (context, landing_pad);
711
#ifdef __ARM_EABI_UNWINDER__
712
  if (found_type == found_cleanup)
713
    __cxa_begin_cleanup(ue_header);
714
#endif
715
  return _URC_INSTALL_CONTEXT;
716
}
717
 
718
/* The ARM EABI implementation of __cxa_call_unexpected is in a
719
   different file so that the personality routine (PR) can be used
720
   standalone.  The generic routine shared datastructures with the PR
721
   so it is most convenient to implement it here.  */
722
#ifndef __ARM_EABI_UNWINDER__
723
extern "C" void
724
__cxa_call_unexpected (void *exc_obj_in)
725
{
726
  _Unwind_Exception *exc_obj
727
    = reinterpret_cast <_Unwind_Exception *>(exc_obj_in);
728
 
729
  __cxa_begin_catch (exc_obj);
730
 
731
  // This function is a handler for our exception argument.  If we exit
732
  // by throwing a different exception, we'll need the original cleaned up.
733
  struct end_catch_protect
734
  {
735
    end_catch_protect() { }
736
    ~end_catch_protect() { __cxa_end_catch(); }
737
  } end_catch_protect_obj;
738
 
739
  lsda_header_info info;
740
  __cxa_exception *xh = __get_exception_header_from_ue (exc_obj);
741
  const unsigned char *xh_lsda;
742
  _Unwind_Sword xh_switch_value;
743
  std::terminate_handler xh_terminate_handler;
744
 
745
  // If the unexpectedHandler rethrows the exception (e.g. to categorize it),
746
  // it will clobber data about the current handler.  So copy the data out now.
747
  xh_lsda = xh->languageSpecificData;
748
  xh_switch_value = xh->handlerSwitchValue;
749
  xh_terminate_handler = xh->terminateHandler;
750
  info.ttype_base = (_Unwind_Ptr) xh->catchTemp;
751
 
752
  __try
753
    { __unexpected (xh->unexpectedHandler); }
754
  __catch(...)
755
    {
756
      // Get the exception thrown from unexpected.
757
 
758
      __cxa_eh_globals *globals = __cxa_get_globals_fast ();
759
      __cxa_exception *new_xh = globals->caughtExceptions;
760
      void *new_ptr = __get_object_from_ambiguous_exception (new_xh);
761
 
762
      // We don't quite have enough stuff cached; re-parse the LSDA.
763
      parse_lsda_header (0, xh_lsda, &info);
764
 
765
      // If this new exception meets the exception spec, allow it.
766
      if (check_exception_spec (&info, __get_exception_header_from_obj
767
                                  (new_ptr)->exceptionType,
768
				new_ptr, xh_switch_value))
769
	{ __throw_exception_again; }
770
 
771
      // If the exception spec allows std::bad_exception, throw that.
772
      // We don't have a thrown object to compare against, but since
773
      // bad_exception doesn't have virtual bases, that's OK; just pass 0.
774
#if defined(__EXCEPTIONS) && defined(__GXX_RTTI)
775
      const std::type_info &bad_exc = typeid (std::bad_exception);
776
      if (check_exception_spec (&info, &bad_exc, 0, xh_switch_value))
777
	throw std::bad_exception();
778
#endif
779
 
780
      // Otherwise, die.
781
      __terminate (xh_terminate_handler);
782
    }
783
}
784
#endif
785
 
786
#if defined (__SEH__) && !defined (_GLIBCXX_SJLJ_EXCEPTIONS)
787
extern "C"
788
EXCEPTION_DISPOSITION
789
__gxx_personality_seh0 (PEXCEPTION_RECORD ms_exc, void *this_frame,
790
			PCONTEXT ms_orig_context, PDISPATCHER_CONTEXT ms_disp)
791
{
792
  return _GCC_specific_handler (ms_exc, this_frame, ms_orig_context,
793
				ms_disp, __gxx_personality_imp);
794
}
795
#endif /* SEH */
796
 
797
} // namespace __cxxabiv1