summaryrefslogtreecommitdiff
path: root/gdb/infcall.c
blob: f87d3ba3258dc2374f700ef5ebe9dd0a9b031d07 (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
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
/* Perform an inferior function call, for GDB, the GNU debugger.

   Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
   1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 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 "breakpoint.h"
#include "target.h"
#include "regcache.h"
#include "inferior.h"
#include "gdb_assert.h"
#include "block.h"
#include "gdbcore.h"
#include "language.h"
#include "symfile.h"
#include "gdbcmd.h"
#include "command.h"
#include "gdb_string.h"

/* NOTE: cagney/2003-04-16: What's the future of this code?

   GDB needs an asynchronous expression evaluator, that means an
   asynchronous inferior function call implementation, and that in
   turn means restructuring the code so that it is event driven.  */

/* How you should pass arguments to a function depends on whether it
   was defined in K&R style or prototype style.  If you define a
   function using the K&R syntax that takes a `float' argument, then
   callers must pass that argument as a `double'.  If you define the
   function using the prototype syntax, then you must pass the
   argument as a `float', with no promotion.

   Unfortunately, on certain older platforms, the debug info doesn't
   indicate reliably how each function was defined.  A function type's
   TYPE_FLAG_PROTOTYPED flag may be clear, even if the function was
   defined in prototype style.  When calling a function whose
   TYPE_FLAG_PROTOTYPED flag is clear, GDB consults this flag to
   decide what to do.

   For modern targets, it is proper to assume that, if the prototype
   flag is clear, that can be trusted: `float' arguments should be
   promoted to `double'.  For some older targets, if the prototype
   flag is clear, that doesn't tell us anything.  The default is to
   trust the debug information; the user can override this behavior
   with "set coerce-float-to-double 0".  */

static int coerce_float_to_double_p = 1;

/* This boolean tells what gdb should do if a signal is received while
   in a function called from gdb (call dummy).  If set, gdb unwinds
   the stack and restore the context to what as it was before the
   call.

   The default is to stop in the frame where the signal was received. */

int unwind_on_signal_p = 0;

/* Perform the standard coercions that are specified
   for arguments to be passed to C functions.

   If PARAM_TYPE is non-NULL, it is the expected parameter type.
   IS_PROTOTYPED is non-zero if the function declaration is prototyped.  */

static struct value *
value_arg_coerce (struct value *arg, struct type *param_type,
		  int is_prototyped)
{
  register struct type *arg_type = check_typedef (VALUE_TYPE (arg));
  register struct type *type
    = param_type ? check_typedef (param_type) : arg_type;

  switch (TYPE_CODE (type))
    {
    case TYPE_CODE_REF:
      if (TYPE_CODE (arg_type) != TYPE_CODE_REF
	  && TYPE_CODE (arg_type) != TYPE_CODE_PTR)
	{
	  arg = value_addr (arg);
	  VALUE_TYPE (arg) = param_type;
	  return arg;
	}
      break;
    case TYPE_CODE_INT:
    case TYPE_CODE_CHAR:
    case TYPE_CODE_BOOL:
    case TYPE_CODE_ENUM:
      /* If we don't have a prototype, coerce to integer type if necessary.  */
      if (!is_prototyped)
	{
	  if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int))
	    type = builtin_type_int;
	}
      /* Currently all target ABIs require at least the width of an integer
         type for an argument.  We may have to conditionalize the following
         type coercion for future targets.  */
      if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int))
	type = builtin_type_int;
      break;
    case TYPE_CODE_FLT:
      if (!is_prototyped && coerce_float_to_double_p)
	{
	  if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_double))
	    type = builtin_type_double;
	  else if (TYPE_LENGTH (type) > TYPE_LENGTH (builtin_type_double))
	    type = builtin_type_long_double;
	}
      break;
    case TYPE_CODE_FUNC:
      type = lookup_pointer_type (type);
      break;
    case TYPE_CODE_ARRAY:
      /* Arrays are coerced to pointers to their first element, unless
         they are vectors, in which case we want to leave them alone,
         because they are passed by value.  */
      if (current_language->c_style_arrays)
	if (!TYPE_VECTOR (type))
	  type = lookup_pointer_type (TYPE_TARGET_TYPE (type));
      break;
    case TYPE_CODE_UNDEF:
    case TYPE_CODE_PTR:
    case TYPE_CODE_STRUCT:
    case TYPE_CODE_UNION:
    case TYPE_CODE_VOID:
    case TYPE_CODE_SET:
    case TYPE_CODE_RANGE:
    case TYPE_CODE_STRING:
    case TYPE_CODE_BITSTRING:
    case TYPE_CODE_ERROR:
    case TYPE_CODE_MEMBER:
    case TYPE_CODE_METHOD:
    case TYPE_CODE_COMPLEX:
    default:
      break;
    }

  return value_cast (type, arg);
}

/* Determine a function's address and its return type from its value.
   Calls error() if the function is not valid for calling.  */

static CORE_ADDR
find_function_addr (struct value *function, struct type **retval_type)
{
  register struct type *ftype = check_typedef (VALUE_TYPE (function));
  register enum type_code code = TYPE_CODE (ftype);
  struct type *value_type;
  CORE_ADDR funaddr;

  /* If it's a member function, just look at the function
     part of it.  */

  /* Determine address to call.  */
  if (code == TYPE_CODE_FUNC || code == TYPE_CODE_METHOD)
    {
      funaddr = VALUE_ADDRESS (function);
      value_type = TYPE_TARGET_TYPE (ftype);
    }
  else if (code == TYPE_CODE_PTR)
    {
      funaddr = value_as_address (function);
      ftype = check_typedef (TYPE_TARGET_TYPE (ftype));
      if (TYPE_CODE (ftype) == TYPE_CODE_FUNC
	  || TYPE_CODE (ftype) == TYPE_CODE_METHOD)
	{
	  funaddr = CONVERT_FROM_FUNC_PTR_ADDR (funaddr);
	  value_type = TYPE_TARGET_TYPE (ftype);
	}
      else
	value_type = builtin_type_int;
    }
  else if (code == TYPE_CODE_INT)
    {
      /* Handle the case of functions lacking debugging info.
         Their values are characters since their addresses are char */
      if (TYPE_LENGTH (ftype) == 1)
	funaddr = value_as_address (value_addr (function));
      else
	/* Handle integer used as address of a function.  */
	funaddr = (CORE_ADDR) value_as_long (function);

      value_type = builtin_type_int;
    }
  else
    error ("Invalid data type for function to be called.");

  *retval_type = value_type;
  return funaddr;
}

/* Call breakpoint_auto_delete on the current contents of the bpstat
   pointed to by arg (which is really a bpstat *).  */

static void
breakpoint_auto_delete_contents (void *arg)
{
  breakpoint_auto_delete (*(bpstat *) arg);
}

/* All this stuff with a dummy frame may seem unnecessarily complicated
   (why not just save registers in GDB?).  The purpose of pushing a dummy
   frame which looks just like a real frame is so that if you call a
   function and then hit a breakpoint (get a signal, etc), "backtrace"
   will look right.  Whether the backtrace needs to actually show the
   stack at the time the inferior function was called is debatable, but
   it certainly needs to not display garbage.  So if you are contemplating
   making dummy frames be different from normal frames, consider that.  */

/* Perform a function call in the inferior.
   ARGS is a vector of values of arguments (NARGS of them).
   FUNCTION is a value, the function to be called.
   Returns a value representing what the function returned.
   May fail to return, if a breakpoint or signal is hit
   during the execution of the function.

   ARGS is modified to contain coerced values. */

struct value *
call_function_by_hand (struct value *function, int nargs, struct value **args)
{
  register CORE_ADDR sp;
  CORE_ADDR dummy_addr;
  struct type *value_type;
  unsigned char struct_return;
  CORE_ADDR struct_addr = 0;
  struct regcache *retbuf;
  struct cleanup *retbuf_cleanup;
  struct inferior_status *inf_status;
  struct cleanup *inf_status_cleanup;
  CORE_ADDR funaddr;
  int using_gcc;		/* Set to version of gcc in use, or zero if not gcc */
  CORE_ADDR real_pc;
  struct type *ftype = check_typedef (SYMBOL_TYPE (function));
  CORE_ADDR bp_addr;

  if (!target_has_execution)
    noprocess ();

  /* Create a cleanup chain that contains the retbuf (buffer
     containing the register values).  This chain is create BEFORE the
     inf_status chain so that the inferior status can cleaned up
     (restored or discarded) without having the retbuf freed.  */
  retbuf = regcache_xmalloc (current_gdbarch);
  retbuf_cleanup = make_cleanup_regcache_xfree (retbuf);

  /* A cleanup for the inferior status.  Create this AFTER the retbuf
     so that this can be discarded or applied without interfering with
     the regbuf.  */
  inf_status = save_inferior_status (1);
  inf_status_cleanup = make_cleanup_restore_inferior_status (inf_status);

  if (DEPRECATED_PUSH_DUMMY_FRAME_P ())
    {
      /* DEPRECATED_PUSH_DUMMY_FRAME is responsible for saving the
	 inferior registers (and frame_pop() for restoring them).  (At
	 least on most machines) they are saved on the stack in the
	 inferior.  */
      DEPRECATED_PUSH_DUMMY_FRAME;
    }
  else
    {
      /* FIXME: cagney/2003-02-26: Step zero of this little tinker is
      to extract the generic dummy frame code from the architecture
      vector.  Hence this direct call.

      A follow-on change is to modify this interface so that it takes
      thread OR frame OR tpid as a parameter, and returns a dummy
      frame handle.  The handle can then be used further down as a
      parameter SAVE_DUMMY_FRAME_TOS.  Hmm, thinking about it, since
      everything is ment to be using generic dummy frames, why not
      even use some of the dummy frame code to here - do a regcache
      dup and then pass the duped regcache, along with all the other
      stuff, at one single point.

      In fact, you can even save the structure's return address in the
      dummy frame and fix one of those nasty lost struct return edge
      conditions.  */
      generic_push_dummy_frame ();
    }

  /* Ensure that the initial SP is correctly aligned.  */
  {
    CORE_ADDR old_sp = read_sp ();
    if (gdbarch_frame_align_p (current_gdbarch))
      {
	/* NOTE: cagney/2002-09-18:
	   
	   On a RISC architecture, a void parameterless generic dummy
	   frame (i.e., no parameters, no result) typically does not
	   need to push anything the stack and hence can leave SP and
	   FP.  Similarly, a framelss (possibly leaf) function does
	   not push anything on the stack and, hence, that too can
	   leave FP and SP unchanged.  As a consequence, a sequence of
	   void parameterless generic dummy frame calls to frameless
	   functions will create a sequence of effectively identical
	   frames (SP, FP and TOS and PC the same).  This, not
	   suprisingly, results in what appears to be a stack in an
	   infinite loop --- when GDB tries to find a generic dummy
	   frame on the internal dummy frame stack, it will always
	   find the first one.

	   To avoid this problem, the code below always grows the
	   stack.  That way, two dummy frames can never be identical.
	   It does burn a few bytes of stack but that is a small price
	   to pay :-).  */
	sp = gdbarch_frame_align (current_gdbarch, old_sp);
	if (sp == old_sp)
	  {
	    if (INNER_THAN (1, 2))
	      /* Stack grows down.  */
	      sp = gdbarch_frame_align (current_gdbarch, old_sp - 1);
	    else
	      /* Stack grows up.  */
	      sp = gdbarch_frame_align (current_gdbarch, old_sp + 1);
	  }
	gdb_assert ((INNER_THAN (1, 2) && sp <= old_sp)
		    || (INNER_THAN (2, 1) && sp >= old_sp));
      }
    else
      /* FIXME: cagney/2002-09-18: Hey, you loose!  Who knows how
	 badly aligned the SP is!  Further, per comment above, if the
	 generic dummy frame ends up empty (because nothing is pushed)
	 GDB won't be able to correctly perform back traces.  If a
	 target is having trouble with backtraces, first thing to do
	 is add FRAME_ALIGN() to its architecture vector.  After that,
	 try adding SAVE_DUMMY_FRAME_TOS() and modifying
	 DEPRECATED_FRAME_CHAIN so that when the next outer frame is a
	 generic dummy, it returns the current frame's base.  */
      sp = old_sp;
  }

  funaddr = find_function_addr (function, &value_type);
  CHECK_TYPEDEF (value_type);

  {
    struct block *b = block_for_pc (funaddr);
    /* If compiled without -g, assume GCC 2.  */
    using_gcc = (b == NULL ? 2 : BLOCK_GCC_COMPILED (b));
  }

  /* Are we returning a value using a structure return or a normal
     value return? */

  struct_return = using_struct_return (function, funaddr, value_type,
				       using_gcc);

  switch (CALL_DUMMY_LOCATION)
    {
    case ON_STACK:
      {
	/* CALL_DUMMY is an array of words (REGISTER_SIZE), but each
	   word is in host byte order.  Before calling FIX_CALL_DUMMY,
	   we byteswap it and remove any extra bytes which might exist
	   because ULONGEST is bigger than REGISTER_SIZE.  */
	/* NOTE: This is pretty wierd, as the call dummy is actually a
	   sequence of instructions.  But CISC machines will have to
	   pack the instructions into REGISTER_SIZE units (and so will
	   RISC machines for which INSTRUCTION_SIZE is not
	   REGISTER_SIZE).  */
	/* NOTE: This is pretty stupid.  CALL_DUMMY should be in
	   strict target byte order. */
	CORE_ADDR start_sp;
	ULONGEST *dummy = alloca (SIZEOF_CALL_DUMMY_WORDS);
	int sizeof_dummy1 = (REGISTER_SIZE * SIZEOF_CALL_DUMMY_WORDS
			     / sizeof (ULONGEST));
	char *dummy1 = alloca (sizeof_dummy1);
	memcpy (dummy, CALL_DUMMY_WORDS, SIZEOF_CALL_DUMMY_WORDS);
	if (INNER_THAN (1, 2))
	  {
	    /* Stack grows down */
	    sp -= sizeof_dummy1;
	    start_sp = sp;
	  }
	else
	  {
	    /* Stack grows up */
	    start_sp = sp;
	    sp += sizeof_dummy1;
	  }
	/* NOTE: cagney/2002-09-10: Don't bother re-adjusting the
	   stack after allocating space for the call dummy.  A target
	   can specify a SIZEOF_DUMMY1 (via SIZEOF_CALL_DUMMY_WORDS)
	   such that all local alignment requirements are met.  */
	/* Create a call sequence customized for this function and the
	   number of arguments for it.  */
	{
	  int i;
	  for (i = 0; i < (int) (SIZEOF_CALL_DUMMY_WORDS / sizeof (dummy[0]));
	       i++)
	    store_unsigned_integer (&dummy1[i * REGISTER_SIZE],
				    REGISTER_SIZE,
				    (ULONGEST) dummy[i]);
	}
	/* NOTE: cagney/2003-04-22: This computation of REAL_PC,
	   BP_ADDR and DUMMY_ADDR is pretty messed up.  It comes from
	   constant tinkering with the values.  Instead a
	   FIX_CALL_DUMMY replacement (PUSH_DUMMY_BREAKPOINT?) should
	   just do everything.  */
#ifdef GDB_TARGET_IS_HPPA
	real_pc = FIX_CALL_DUMMY (dummy1, start_sp, funaddr, nargs, args,
				  value_type, using_gcc);
#else
	if (FIX_CALL_DUMMY_P ())
	  {
	    /* gdb_assert (CALL_DUMMY_LOCATION == ON_STACK) true?  */
	    FIX_CALL_DUMMY (dummy1, start_sp, funaddr, nargs, args, value_type,
			    using_gcc);
	  }
	real_pc = start_sp;
#endif
	dummy_addr = start_sp;
	/* Yes, the offset is applied to the real_pc and not the dummy
	   addr.  Ulgh!  Blame the HP/UX target.  */
	bp_addr = real_pc + CALL_DUMMY_BREAKPOINT_OFFSET;
	/* Yes, the offset is applied to the real_pc and not the
	   dummy_addr.  Ulgh!  Blame the HP/UX target.  */
	real_pc += CALL_DUMMY_START_OFFSET;
	write_memory (start_sp, (char *) dummy1, sizeof_dummy1);
	if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES)
	  generic_save_call_dummy_addr (start_sp, start_sp + sizeof_dummy1);
	break;
      }
    case AT_ENTRY_POINT:
      real_pc = funaddr;
      dummy_addr = CALL_DUMMY_ADDRESS ();
      /* A call dummy always consists of just a single breakpoint, so
         it's address is the same as the address of the dummy.  */
      bp_addr = dummy_addr;
      if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES)
	/* NOTE: cagney/2002-04-13: The entry point is going to be
           modified with a single breakpoint.  */
	generic_save_call_dummy_addr (CALL_DUMMY_ADDRESS (),
				      CALL_DUMMY_ADDRESS () + 1);
      break;
    default:
      internal_error (__FILE__, __LINE__, "bad switch");
    }

  if (nargs < TYPE_NFIELDS (ftype))
    error ("too few arguments in function call");

  {
    int i;
    for (i = nargs - 1; i >= 0; i--)
      {
	int prototyped;
	struct type *param_type;
	
	/* FIXME drow/2002-05-31: Should just always mark methods as
	   prototyped.  Can we respect TYPE_VARARGS?  Probably not.  */
	if (TYPE_CODE (ftype) == TYPE_CODE_METHOD)
	  prototyped = 1;
	else if (i < TYPE_NFIELDS (ftype))
	  prototyped = TYPE_PROTOTYPED (ftype);
	else
	  prototyped = 0;

	if (i < TYPE_NFIELDS (ftype))
	  param_type = TYPE_FIELD_TYPE (ftype, i);
	else
	  param_type = NULL;
	
	args[i] = value_arg_coerce (args[i], param_type, prototyped);

	/* elz: this code is to handle the case in which the function
	   to be called has a pointer to function as parameter and the
	   corresponding actual argument is the address of a function
	   and not a pointer to function variable.  In aCC compiled
	   code, the calls through pointers to functions (in the body
	   of the function called by hand) are made via
	   $$dyncall_external which requires some registers setting,
	   this is taken care of if we call via a function pointer
	   variable, but not via a function address.  In cc this is
	   not a problem. */

	if (using_gcc == 0)
	  {
	    if (param_type != NULL && TYPE_CODE (ftype) != TYPE_CODE_METHOD)
	      {
		/* if this parameter is a pointer to function.  */
		if (TYPE_CODE (param_type) == TYPE_CODE_PTR)
		  if (TYPE_CODE (TYPE_TARGET_TYPE (param_type)) == TYPE_CODE_FUNC)
		    /* elz: FIXME here should go the test about the
		       compiler used to compile the target. We want to
		       issue the error message only if the compiler
		       used was HP's aCC.  If we used HP's cc, then
		       there is no problem and no need to return at
		       this point.  */
		    /* Go see if the actual parameter is a variable of
		       type pointer to function or just a function.  */
		    if (args[i]->lval == not_lval)
		      {
			char *arg_name;
			if (find_pc_partial_function ((CORE_ADDR) args[i]->aligner.contents[0], &arg_name, NULL, NULL))
			  error ("\
You cannot use function <%s> as argument. \n\
You must use a pointer to function type variable. Command ignored.", arg_name);
		      }
	      }
	  }
      }
  }

  if (REG_STRUCT_HAS_ADDR_P ())
    {
      int i;
      /* This is a machine like the sparc, where we may need to pass a
	 pointer to the structure, not the structure itself.  */
      for (i = nargs - 1; i >= 0; i--)
	{
	  struct type *arg_type = check_typedef (VALUE_TYPE (args[i]));
	  if ((TYPE_CODE (arg_type) == TYPE_CODE_STRUCT
	       || TYPE_CODE (arg_type) == TYPE_CODE_UNION
	       || TYPE_CODE (arg_type) == TYPE_CODE_ARRAY
	       || TYPE_CODE (arg_type) == TYPE_CODE_STRING
	       || TYPE_CODE (arg_type) == TYPE_CODE_BITSTRING
	       || TYPE_CODE (arg_type) == TYPE_CODE_SET
	       || (TYPE_CODE (arg_type) == TYPE_CODE_FLT
		   && TYPE_LENGTH (arg_type) > 8)
	       )
	      && REG_STRUCT_HAS_ADDR (using_gcc, arg_type))
	    {
	      CORE_ADDR addr;
	      int len;		/*  = TYPE_LENGTH (arg_type); */
	      int aligned_len;
	      arg_type = check_typedef (VALUE_ENCLOSING_TYPE (args[i]));
	      len = TYPE_LENGTH (arg_type);

	      if (STACK_ALIGN_P ())
		/* MVS 11/22/96: I think at least some of this
		   stack_align code is really broken.  Better to let
		   PUSH_ARGUMENTS adjust the stack in a target-defined
		   manner.  */
		aligned_len = STACK_ALIGN (len);
	      else
		aligned_len = len;
	      if (INNER_THAN (1, 2))
		{
		  /* stack grows downward */
		  sp -= aligned_len;
		  /* ... so the address of the thing we push is the
		     stack pointer after we push it.  */
		  addr = sp;
		}
	      else
		{
		  /* The stack grows up, so the address of the thing
		     we push is the stack pointer before we push it.  */
		  addr = sp;
		  sp += aligned_len;
		}
	      /* Push the structure.  */
	      write_memory (addr, VALUE_CONTENTS_ALL (args[i]), len);
	      /* The value we're going to pass is the address of the
		 thing we just pushed.  */
	      /*args[i] = value_from_longest (lookup_pointer_type (value_type),
		(LONGEST) addr); */
	      args[i] = value_from_pointer (lookup_pointer_type (arg_type),
					    addr);
	    }
	}
    }


  /* Reserve space for the return structure to be written on the
     stack, if necessary.  Make certain that the value is correctly
     aligned. */

  if (struct_return)
    {
      int len = TYPE_LENGTH (value_type);
      if (STACK_ALIGN_P ())
	/* NOTE: cagney/2003-03-22: Should rely on frame align, rather
           than stack align to force the alignment of the stack.  */
	len = STACK_ALIGN (len);
      if (INNER_THAN (1, 2))
	{
	  /* Stack grows downward.  Align STRUCT_ADDR and SP after
             making space for the return value.  */
	  sp -= len;
	  if (gdbarch_frame_align_p (current_gdbarch))
	    sp = gdbarch_frame_align (current_gdbarch, sp);
	  struct_addr = sp;
	}
      else
	{
	  /* Stack grows upward.  Align the frame, allocate space, and
             then again, re-align the frame??? */
	  if (gdbarch_frame_align_p (current_gdbarch))
	    sp = gdbarch_frame_align (current_gdbarch, sp);
	  struct_addr = sp;
	  sp += len;
	  if (gdbarch_frame_align_p (current_gdbarch))
	    sp = gdbarch_frame_align (current_gdbarch, sp);
	}
    }

  /* elz: on HPPA no need for this extra alignment, maybe it is needed
     on other architectures. This is because all the alignment is
     taken care of in the above code (ifdef REG_STRUCT_HAS_ADDR) and
     in hppa_push_arguments */
  /* NOTE: cagney/2003-03-24: The below code is very broken.  Given an
     odd sized parameter the below will mis-align the stack.  As was
     suggested back in '96, better to let PUSH_ARGUMENTS handle it.  */
  if (DEPRECATED_EXTRA_STACK_ALIGNMENT_NEEDED)
    {
      /* MVS 11/22/96: I think at least some of this stack_align code
	 is really broken.  Better to let push_dummy_call() adjust the
	 stack in a target-defined manner.  */
      if (STACK_ALIGN_P () && INNER_THAN (1, 2))
	{
	  /* If stack grows down, we must leave a hole at the top. */
	  int len = 0;
	  int i;
	  for (i = nargs - 1; i >= 0; i--)
	    len += TYPE_LENGTH (VALUE_ENCLOSING_TYPE (args[i]));
	  if (DEPRECATED_CALL_DUMMY_STACK_ADJUST_P ())
	    len += DEPRECATED_CALL_DUMMY_STACK_ADJUST;
	  sp -= STACK_ALIGN (len) - len;
	}
    }

  /* Create the dummy stack frame.  Pass in the call dummy address as,
     presumably, the ABI code knows where, in the call dummy, the
     return address should be pointed.  */
  if (gdbarch_push_dummy_call_p (current_gdbarch))
    /* When there is no push_dummy_call method, should this code
       simply error out.  That would the implementation of this method
       for all ABIs (which is probably a good thing).  */
    sp = gdbarch_push_dummy_call (current_gdbarch, current_regcache,
				  dummy_addr, nargs, args, sp, struct_return,
				  struct_addr);
  else  if (DEPRECATED_PUSH_ARGUMENTS_P ())
    /* Keep old targets working.  */
    sp = DEPRECATED_PUSH_ARGUMENTS (nargs, args, sp, struct_return,
				    struct_addr);
  else
    sp = legacy_push_arguments (nargs, args, sp, struct_return, struct_addr);

  if (DEPRECATED_PUSH_RETURN_ADDRESS_P ())
    /* for targets that use no CALL_DUMMY */
    /* There are a number of targets now which actually don't write
       any CALL_DUMMY instructions into the target, but instead just
       save the machine state, push the arguments, and jump directly
       to the callee function.  Since this doesn't actually involve
       executing a JSR/BSR instruction, the return address must be set
       up by hand, either by pushing onto the stack or copying into a
       return-address register as appropriate.  Formerly this has been
       done in PUSH_ARGUMENTS, but that's overloading its
       functionality a bit, so I'm making it explicit to do it here.  */
    /* NOTE: cagney/2003-04-22: The first parameter ("real_pc") has
       been replaced with zero, it turns out that no implementation
       used that parameter.  This occured because the value being
       supplied - the address of the called function's entry point
       instead of the address of the breakpoint that the called
       function should return to - wasn't useful.  */
    sp = DEPRECATED_PUSH_RETURN_ADDRESS (0, sp);

  /* NOTE: cagney/2003-03-23: Diable this code when there is a
     push_dummy_call() method.  Since that method will have already
     handled any alignment issues, the code below is entirely
     redundant.  */
  if (!gdbarch_push_dummy_call_p (current_gdbarch)
      && STACK_ALIGN_P () && !INNER_THAN (1, 2))
    {
      /* If stack grows up, we must leave a hole at the bottom, note
         that sp already has been advanced for the arguments!  */
      if (DEPRECATED_CALL_DUMMY_STACK_ADJUST_P ())
	sp += DEPRECATED_CALL_DUMMY_STACK_ADJUST;
      sp = STACK_ALIGN (sp);
    }

/* XXX This seems wrong.  For stacks that grow down we shouldn't do
   anything here!  */
  /* MVS 11/22/96: I think at least some of this stack_align code is
     really broken.  Better to let PUSH_ARGUMENTS adjust the stack in
     a target-defined manner.  */
  if (DEPRECATED_CALL_DUMMY_STACK_ADJUST_P ())
    if (INNER_THAN (1, 2))
      {
	/* stack grows downward */
	sp -= DEPRECATED_CALL_DUMMY_STACK_ADJUST;
      }

  /* Store the address at which the structure is supposed to be
     written.  */
  /* NOTE: 2003-03-24: Since PUSH_ARGUMENTS can (and typically does)
     store the struct return address, this call is entirely redundant.  */
  if (struct_return && DEPRECATED_STORE_STRUCT_RETURN_P ())
    DEPRECATED_STORE_STRUCT_RETURN (struct_addr, sp);

  /* Write the stack pointer.  This is here because the statements above
     might fool with it.  On SPARC, this write also stores the register
     window into the right place in the new stack frame, which otherwise
     wouldn't happen.  (See store_inferior_registers in sparc-nat.c.)  */
  /* NOTE: cagney/2003-03-23: Disable this code when there is a
     push_dummy_call() method.  Since that method will have already
     stored the stack pointer (as part of creating the fake call
     frame), and none of the code following that code adjusts the
     stack-pointer value, the below call is entirely redundant.  */
  if (DEPRECATED_DUMMY_WRITE_SP_P ())
    DEPRECATED_DUMMY_WRITE_SP (sp);

  if (SAVE_DUMMY_FRAME_TOS_P ())
    SAVE_DUMMY_FRAME_TOS (sp);

  /* Now proceed, having reached the desired place.  */
  clear_proceed_status ();
    
  /* Create a momentary breakpoint at the return address of the
     inferior.  That way it breaks when it returns.  */

  {
    struct breakpoint *bpt;
    struct symtab_and_line sal;
    struct frame_id frame;
    init_sal (&sal);		/* initialize to zeroes */
    sal.pc = bp_addr;
    sal.section = find_pc_overlay (sal.pc);
    /* Set up a frame ID for the dummy frame so we can pass it to
       set_momentary_breakpoint.  We need to give the breakpoint a
       frame ID so that the breakpoint code can correctly re-identify
       the dummy breakpoint.  */
    /* The assumption here is that push_dummy_call() returned the
       stack part of the frame ID.  Unfortunatly, many older
       architectures were, via a convoluted mess, relying on the
       poorly defined and greatly overloaded DEPRECATED_TARGET_READ_FP
       or DEPRECATED_FP_REGNUM to supply the value.  */
    if (DEPRECATED_TARGET_READ_FP_P ())
      frame = frame_id_build (DEPRECATED_TARGET_READ_FP (), sal.pc);
    else if (DEPRECATED_FP_REGNUM >= 0)
      frame = frame_id_build (read_register (DEPRECATED_FP_REGNUM), sal.pc);
    else
      frame = frame_id_build (sp, sal.pc);
    bpt = set_momentary_breakpoint (sal, frame, bp_call_dummy);
    bpt->disposition = disp_del;
  }

  /* Execute a "stack dummy", a piece of code stored in the stack by
     the debugger to be executed in the inferior.

     The dummy's frame is automatically popped whenever that break is
     hit.  If that is the first time the program stops,
     call_function_by_hand returns to its caller with that frame
     already gone and sets RC to 0.
   
     Otherwise, set RC to a non-zero value.  If the called function
     receives a random signal, we do not allow the user to continue
     executing it as this may not work.  The dummy frame is poped and
     we return 1.  If we hit a breakpoint, we leave the frame in place
     and return 2 (the frame will eventually be popped when we do hit
     the dummy end breakpoint).  */

  {
    struct cleanup *old_cleanups = make_cleanup (null_cleanup, 0);
    int saved_async = 0;

    /* If all error()s out of proceed ended up calling normal_stop
       (and perhaps they should; it already does in the special case
       of error out of resume()), then we wouldn't need this.  */
    make_cleanup (breakpoint_auto_delete_contents, &stop_bpstat);

    disable_watchpoints_before_interactive_call_start ();
    proceed_to_finish = 1;	/* We want stop_registers, please... */

    if (target_can_async_p ())
      saved_async = target_async_mask (0);
    
    proceed (real_pc, TARGET_SIGNAL_0, 0);
    
    if (saved_async)
      target_async_mask (saved_async);
    
    enable_watchpoints_after_interactive_call_stop ();
      
    discard_cleanups (old_cleanups);
  }

  if (stopped_by_random_signal || !stop_stack_dummy)
    {
      /* Find the name of the function we're about to complain about.  */
      char *name = NULL;
      {
	struct symbol *symbol = find_pc_function (funaddr);
	if (symbol)
	  name = SYMBOL_PRINT_NAME (symbol);
	else
	  {
	    /* Try the minimal symbols.  */
	    struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (funaddr);
	    if (msymbol)
	      name = SYMBOL_PRINT_NAME (msymbol);
	  }
      }
      if (name == NULL)
	{
	  /* NOTE: cagney/2003-04-23: Don't blame me.  This code dates
             back to 1993-07-08, I simply moved it.  */
	  char format[80];
	  sprintf (format, "at %s", local_hex_format ());
	  name = alloca (80);
	  /* FIXME-32x64: assumes funaddr fits in a long.  */
	  sprintf (name, format, (unsigned long) funaddr);
	}
      if (stopped_by_random_signal)
	{
	  /* We stopped inside the FUNCTION because of a random
	     signal.  Further execution of the FUNCTION is not
	     allowed. */

	  if (unwind_on_signal_p)
	    {
	      /* The user wants the context restored. */

	      /* We must get back to the frame we were before the
		 dummy call. */
	      frame_pop (get_current_frame ());

	      /* FIXME: Insert a bunch of wrap_here; name can be very
		 long if it's a C++ name with arguments and stuff.  */
	      error ("\
The program being debugged was signaled while in a function called from GDB.\n\
GDB has restored the context to what it was before the call.\n\
To change this behavior use \"set unwindonsignal off\"\n\
Evaluation of the expression containing the function (%s) will be abandoned.",
		     name);
	    }
	  else
	    {
	      /* The user wants to stay in the frame where we stopped
                 (default).*/
	      /* If we restored the inferior status (via the cleanup),
		 we would print a spurious error message (Unable to
		 restore previously selected frame), would write the
		 registers from the inf_status (which is wrong), and
		 would do other wrong things.  */
	      discard_cleanups (inf_status_cleanup);
	      discard_inferior_status (inf_status);
	      /* FIXME: Insert a bunch of wrap_here; name can be very
		 long if it's a C++ name with arguments and stuff.  */
	      error ("\
The program being debugged was signaled while in a function called from GDB.\n\
GDB remains in the frame where the signal was received.\n\
To change this behavior use \"set unwindonsignal on\"\n\
Evaluation of the expression containing the function (%s) will be abandoned.",
		     name);
	    }
	}

      if (!stop_stack_dummy)
	{
	  /* We hit a breakpoint inside the FUNCTION. */
	  /* If we restored the inferior status (via the cleanup), we
	     would print a spurious error message (Unable to restore
	     previously selected frame), would write the registers
	     from the inf_status (which is wrong), and would do other
	     wrong things.  */
	  discard_cleanups (inf_status_cleanup);
	  discard_inferior_status (inf_status);
	  /* The following error message used to say "The expression
	     which contained the function call has been discarded."
	     It is a hard concept to explain in a few words.  Ideally,
	     GDB would be able to resume evaluation of the expression
	     when the function finally is done executing.  Perhaps
	     someday this will be implemented (it would not be easy).  */
	  /* FIXME: Insert a bunch of wrap_here; name can be very long if it's
	     a C++ name with arguments and stuff.  */
	  error ("\
The program being debugged stopped while in a function called from GDB.\n\
When the function (%s) is done executing, GDB will silently\n\
stop (instead of continuing to evaluate the expression containing\n\
the function call).", name);
	}

      /* The above code errors out, so ...  */
      internal_error (__FILE__, __LINE__, "... should not be here");
    }

  /* If we get here the called FUNCTION run to completion. */

  /* On normal return, the stack dummy has been popped already.  */
  regcache_cpy_no_passthrough (retbuf, stop_registers);

  /* Restore the inferior status, via its cleanup.  At this stage,
     leave the RETBUF alone.  */
  do_cleanups (inf_status_cleanup);

  /* Figure out the value returned by the function.  */
  /* elz: I defined this new macro for the hppa architecture only.
     this gives us a way to get the value returned by the function
     from the stack, at the same address we told the function to put
     it.  We cannot assume on the pa that r28 still contains the
     address of the returned structure. Usually this will be
     overwritten by the callee.  I don't know about other
     architectures, so I defined this macro */
#ifdef VALUE_RETURNED_FROM_STACK
  if (struct_return)
    {
      do_cleanups (retbuf_cleanup);
      return VALUE_RETURNED_FROM_STACK (value_type, struct_addr);
    }
#endif
  /* NOTE: cagney/2002-09-10: Only when the stack has been correctly
     aligned (using frame_align()) do we can trust STRUCT_ADDR and
     fetch the return value direct from the stack.  This lack of trust
     comes about because legacy targets have a nasty habit of
     silently, and local to PUSH_ARGUMENTS(), moving STRUCT_ADDR.  For
     such targets, just hope that value_being_returned() can find the
     adjusted value.  */
  if (struct_return && gdbarch_frame_align_p (current_gdbarch))
    {
      struct value *retval = value_at (value_type, struct_addr, NULL);
      do_cleanups (retbuf_cleanup);
      return retval;
    }
  else
    {
      struct value *retval = value_being_returned (value_type, retbuf,
						   struct_return);
      do_cleanups (retbuf_cleanup);
      return retval;
    }
}

void _initialize_infcall (void);

void
_initialize_infcall (void)
{
  add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure,
			   &coerce_float_to_double_p, "\
Set coercion of floats to doubles when calling functions\n\
Variables of type float should generally be converted to doubles before\n\
calling an unprototyped function, and left alone when calling a prototyped\n\
function.  However, some older debug info formats do not provide enough\n\
information to determine that a function is prototyped.  If this flag is\n\
set, GDB will perform the conversion for a function it considers\n\
unprototyped.\n\
The default is to perform the conversion.\n", "\
Show coercion of floats to doubles when calling functions\n\
Variables of type float should generally be converted to doubles before\n\
calling an unprototyped function, and left alone when calling a prototyped\n\
function.  However, some older debug info formats do not provide enough\n\
information to determine that a function is prototyped.  If this flag is\n\
set, GDB will perform the conversion for a function it considers\n\
unprototyped.\n\
The default is to perform the conversion.\n",
			   NULL, NULL, &setlist, &showlist);

  add_setshow_boolean_cmd ("unwindonsignal", no_class,
			   &unwind_on_signal_p, "\
Set unwinding of stack if a signal is received while in a call dummy.\n\
The unwindonsignal lets the user determine what gdb should do if a signal\n\
is received while in a function called from gdb (call dummy).  If set, gdb\n\
unwinds the stack and restore the context to what as it was before the call.\n\
The default is to stop in the frame where the signal was received.", "\
Set unwinding of stack if a signal is received while in a call dummy.\n\
The unwindonsignal lets the user determine what gdb should do if a signal\n\
is received while in a function called from gdb (call dummy).  If set, gdb\n\
unwinds the stack and restore the context to what as it was before the call.\n\
The default is to stop in the frame where the signal was received.",
			   NULL, NULL, &setlist, &showlist);
}