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
|
/* Generic remote debugging interface for simulators.
Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
Contributed by Cygnus Support.
Steve Chamberlain (sac@cygnus.com).
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 3 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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "inferior.h"
#include "value.h"
#include "gdb_string.h"
#include <ctype.h>
#include <fcntl.h>
#include <signal.h>
#include <setjmp.h>
#include <errno.h>
#include "terminal.h"
#include "target.h"
#include "gdbcore.h"
#include "gdb/callback.h"
#include "gdb/remote-sim.h"
#include "command.h"
#include "regcache.h"
#include "gdb_assert.h"
#include "sim-regno.h"
#include "arch-utils.h"
#include "readline/readline.h"
#include "gdbthread.h"
/* Prototypes */
extern void _initialize_remote_sim (void);
static void dump_mem (char *buf, int len);
static void init_callbacks (void);
static void end_callbacks (void);
static int gdb_os_write_stdout (host_callback *, const char *, int);
static void gdb_os_flush_stdout (host_callback *);
static int gdb_os_write_stderr (host_callback *, const char *, int);
static void gdb_os_flush_stderr (host_callback *);
static int gdb_os_poll_quit (host_callback *);
/* printf_filtered is depreciated */
static void gdb_os_printf_filtered (host_callback *, const char *, ...);
static void gdb_os_vprintf_filtered (host_callback *, const char *, va_list);
static void gdb_os_evprintf_filtered (host_callback *, const char *, va_list);
static void gdb_os_error (host_callback *, const char *, ...);
static void gdbsim_fetch_register (struct regcache *regcache, int regno);
static void gdbsim_store_register (struct regcache *regcache, int regno);
static void gdbsim_kill (void);
static void gdbsim_load (char *prog, int fromtty);
static void gdbsim_open (char *args, int from_tty);
static void gdbsim_close (int quitting);
static void gdbsim_detach (struct target_ops *ops, char *args, int from_tty);
static void gdbsim_resume (ptid_t ptid, int step, enum target_signal siggnal);
static ptid_t gdbsim_wait (ptid_t ptid, struct target_waitstatus *status);
static void gdbsim_prepare_to_store (struct regcache *regcache);
static void gdbsim_files_info (struct target_ops *target);
static void gdbsim_mourn_inferior (struct target_ops *target);
static void gdbsim_stop (ptid_t ptid);
void simulator_command (char *args, int from_tty);
/* Naming convention:
sim_* are the interface to the simulator (see remote-sim.h).
gdbsim_* are stuff which is internal to gdb. */
/* Forward data declarations */
extern struct target_ops gdbsim_ops;
static int program_loaded = 0;
/* We must keep track of whether the simulator has been opened or not because
GDB can call a target's close routine twice, but sim_close doesn't allow
this. We also need to record the result of sim_open so we can pass it
back to the other sim_foo routines. */
static SIM_DESC gdbsim_desc = 0;
/* This is the ptid we use while we're connected to the simulator.
Its value is arbitrary, as the simulator target don't have a notion
or processes or threads, but we need something non-null to place in
inferior_ptid. */
static ptid_t remote_sim_ptid;
static void
dump_mem (char *buf, int len)
{
if (len <= 8)
{
if (len == 8 || len == 4)
{
long l[2];
memcpy (l, buf, len);
printf_filtered ("\t0x%lx", l[0]);
if (len == 8)
printf_filtered (" 0x%lx", l[1]);
printf_filtered ("\n");
}
else
{
int i;
printf_filtered ("\t");
for (i = 0; i < len; i++)
printf_filtered ("0x%x ", buf[i]);
printf_filtered ("\n");
}
}
}
static host_callback gdb_callback;
static int callbacks_initialized = 0;
/* Initialize gdb_callback. */
static void
init_callbacks (void)
{
if (!callbacks_initialized)
{
gdb_callback = default_callback;
gdb_callback.init (&gdb_callback);
gdb_callback.write_stdout = gdb_os_write_stdout;
gdb_callback.flush_stdout = gdb_os_flush_stdout;
gdb_callback.write_stderr = gdb_os_write_stderr;
gdb_callback.flush_stderr = gdb_os_flush_stderr;
gdb_callback.printf_filtered = gdb_os_printf_filtered;
gdb_callback.vprintf_filtered = gdb_os_vprintf_filtered;
gdb_callback.evprintf_filtered = gdb_os_evprintf_filtered;
gdb_callback.error = gdb_os_error;
gdb_callback.poll_quit = gdb_os_poll_quit;
gdb_callback.magic = HOST_CALLBACK_MAGIC;
callbacks_initialized = 1;
}
}
/* Release callbacks (free resources used by them). */
static void
end_callbacks (void)
{
if (callbacks_initialized)
{
gdb_callback.shutdown (&gdb_callback);
callbacks_initialized = 0;
}
}
/* GDB version of os_write_stdout callback. */
static int
gdb_os_write_stdout (host_callback *p, const char *buf, int len)
{
int i;
char b[2];
ui_file_write (gdb_stdtarg, buf, len);
return len;
}
/* GDB version of os_flush_stdout callback. */
static void
gdb_os_flush_stdout (host_callback *p)
{
gdb_flush (gdb_stdtarg);
}
/* GDB version of os_write_stderr callback. */
static int
gdb_os_write_stderr (host_callback *p, const char *buf, int len)
{
int i;
char b[2];
for (i = 0; i < len; i++)
{
b[0] = buf[i];
b[1] = 0;
fputs_unfiltered (b, gdb_stdtargerr);
}
return len;
}
/* GDB version of os_flush_stderr callback. */
static void
gdb_os_flush_stderr (host_callback *p)
{
gdb_flush (gdb_stdtargerr);
}
/* GDB version of printf_filtered callback. */
static void
gdb_os_printf_filtered (host_callback * p, const char *format,...)
{
va_list args;
va_start (args, format);
vfprintf_filtered (gdb_stdout, format, args);
va_end (args);
}
/* GDB version of error vprintf_filtered. */
static void
gdb_os_vprintf_filtered (host_callback * p, const char *format, va_list ap)
{
vfprintf_filtered (gdb_stdout, format, ap);
}
/* GDB version of error evprintf_filtered. */
static void
gdb_os_evprintf_filtered (host_callback * p, const char *format, va_list ap)
{
vfprintf_filtered (gdb_stderr, format, ap);
}
/* GDB version of error callback. */
static void
gdb_os_error (host_callback * p, const char *format,...)
{
if (deprecated_error_hook)
(*deprecated_error_hook) ();
else
{
va_list args;
va_start (args, format);
verror (format, args);
va_end (args);
}
}
int
one2one_register_sim_regno (struct gdbarch *gdbarch, int regnum)
{
/* Only makes sense to supply raw registers. */
gdb_assert (regnum >= 0 && regnum < gdbarch_num_regs (gdbarch));
return regnum;
}
static void
gdbsim_fetch_register (struct regcache *regcache, int regno)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
if (regno == -1)
{
for (regno = 0; regno < gdbarch_num_regs (gdbarch); regno++)
gdbsim_fetch_register (regcache, regno);
return;
}
switch (gdbarch_register_sim_regno (gdbarch, regno))
{
case LEGACY_SIM_REGNO_IGNORE:
break;
case SIM_REGNO_DOES_NOT_EXIST:
{
/* For moment treat a `does not exist' register the same way
as an ``unavailable'' register. */
char buf[MAX_REGISTER_SIZE];
int nr_bytes;
memset (buf, 0, MAX_REGISTER_SIZE);
regcache_raw_supply (regcache, regno, buf);
break;
}
default:
{
static int warn_user = 1;
char buf[MAX_REGISTER_SIZE];
int nr_bytes;
gdb_assert (regno >= 0 && regno < gdbarch_num_regs (gdbarch));
memset (buf, 0, MAX_REGISTER_SIZE);
nr_bytes = sim_fetch_register (gdbsim_desc,
gdbarch_register_sim_regno
(gdbarch, regno),
buf,
register_size (gdbarch, regno));
if (nr_bytes > 0
&& nr_bytes != register_size (gdbarch, regno) && warn_user)
{
fprintf_unfiltered (gdb_stderr,
"Size of register %s (%d/%d) incorrect (%d instead of %d))",
gdbarch_register_name (gdbarch, regno),
regno,
gdbarch_register_sim_regno
(gdbarch, regno),
nr_bytes, register_size (gdbarch, regno));
warn_user = 0;
}
/* FIXME: cagney/2002-05-27: Should check `nr_bytes == 0'
indicating that GDB and the SIM have different ideas about
which registers are fetchable. */
/* Else if (nr_bytes < 0): an old simulator, that doesn't
think to return the register size. Just assume all is ok. */
regcache_raw_supply (regcache, regno, buf);
if (remote_debug)
{
printf_filtered ("gdbsim_fetch_register: %d", regno);
/* FIXME: We could print something more intelligible. */
dump_mem (buf, register_size (gdbarch, regno));
}
break;
}
}
}
static void
gdbsim_store_register (struct regcache *regcache, int regno)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
if (regno == -1)
{
for (regno = 0; regno < gdbarch_num_regs (gdbarch); regno++)
gdbsim_store_register (regcache, regno);
return;
}
else if (gdbarch_register_sim_regno (gdbarch, regno) >= 0)
{
char tmp[MAX_REGISTER_SIZE];
int nr_bytes;
regcache_cooked_read (regcache, regno, tmp);
nr_bytes = sim_store_register (gdbsim_desc,
gdbarch_register_sim_regno
(gdbarch, regno),
tmp, register_size (gdbarch, regno));
if (nr_bytes > 0 && nr_bytes != register_size (gdbarch, regno))
internal_error (__FILE__, __LINE__,
_("Register size different to expected"));
/* FIXME: cagney/2002-05-27: Should check `nr_bytes == 0'
indicating that GDB and the SIM have different ideas about
which registers are fetchable. */
if (remote_debug)
{
printf_filtered ("gdbsim_store_register: %d", regno);
/* FIXME: We could print something more intelligible. */
dump_mem (tmp, register_size (gdbarch, regno));
}
}
}
/* Kill the running program. This may involve closing any open files
and releasing other resources acquired by the simulated program. */
static void
gdbsim_kill (void)
{
if (remote_debug)
printf_filtered ("gdbsim_kill\n");
/* There is no need to `kill' running simulator - the simulator is
not running. Mourning it is enough. */
target_mourn_inferior ();
}
/* Load an executable file into the target process. This is expected to
not only bring new code into the target process, but also to update
GDB's symbol tables to match. */
static void
gdbsim_load (char *args, int fromtty)
{
char **argv;
char *prog;
if (args == NULL)
error_no_arg (_("program to load"));
argv = gdb_buildargv (args);
make_cleanup_freeargv (argv);
prog = tilde_expand (argv[0]);
if (argv[1] != NULL)
error (_("GDB sim does not yet support a load offset."));
if (remote_debug)
printf_filtered ("gdbsim_load: prog \"%s\"\n", prog);
/* FIXME: We will print two messages on error.
Need error to either not print anything if passed NULL or need
another routine that doesn't take any arguments. */
if (sim_load (gdbsim_desc, prog, NULL, fromtty) == SIM_RC_FAIL)
error (_("unable to load program"));
/* FIXME: If a load command should reset the targets registers then
a call to sim_create_inferior() should go here. */
program_loaded = 1;
}
/* Start an inferior process and set inferior_ptid to its pid.
EXEC_FILE is the file to run.
ARGS is a string containing the arguments to the program.
ENV is the environment vector to pass. Errors reported with error().
On VxWorks and various standalone systems, we ignore exec_file. */
/* This is called not only when we first attach, but also when the
user types "run" after having attached. */
static void
gdbsim_create_inferior (struct target_ops *target, char *exec_file, char *args,
char **env, int from_tty)
{
int len;
char *arg_buf, **argv;
if (exec_file == 0 || exec_bfd == 0)
warning (_("No executable file specified."));
if (!program_loaded)
warning (_("No program loaded."));
if (remote_debug)
printf_filtered ("gdbsim_create_inferior: exec_file \"%s\", args \"%s\"\n",
(exec_file ? exec_file : "(NULL)"),
args);
if (ptid_equal (inferior_ptid, remote_sim_ptid))
gdbsim_kill ();
remove_breakpoints ();
init_wait_for_inferior ();
if (exec_file != NULL)
{
len = strlen (exec_file) + 1 + strlen (args) + 1 + /*slop */ 10;
arg_buf = (char *) alloca (len);
arg_buf[0] = '\0';
strcat (arg_buf, exec_file);
strcat (arg_buf, " ");
strcat (arg_buf, args);
argv = gdb_buildargv (arg_buf);
make_cleanup_freeargv (argv);
}
else
argv = NULL;
sim_create_inferior (gdbsim_desc, exec_bfd, argv, env);
inferior_ptid = remote_sim_ptid;
add_inferior_silent (ptid_get_pid (inferior_ptid));
add_thread_silent (inferior_ptid);
target_mark_running (&gdbsim_ops);
insert_breakpoints (); /* Needed to get correct instruction in cache */
clear_proceed_status ();
}
/* The open routine takes the rest of the parameters from the command,
and (if successful) pushes a new target onto the stack.
Targets should supply this routine, if only to provide an error message. */
/* Called when selecting the simulator. EG: (gdb) target sim name. */
static void
gdbsim_open (char *args, int from_tty)
{
int len;
char *arg_buf;
char **argv;
if (remote_debug)
printf_filtered ("gdbsim_open: args \"%s\"\n", args ? args : "(null)");
/* Remove current simulator if one exists. Only do this if the simulator
has been opened because sim_close requires it.
This is important because the call to push_target below will cause
sim_close to be called if the simulator is already open, but push_target
is called after sim_open! We can't move the call to push_target before
the call to sim_open because sim_open may invoke `error'. */
if (gdbsim_desc != NULL)
unpush_target (&gdbsim_ops);
len = (7 + 1 /* gdbsim */
+ strlen (" -E little")
+ strlen (" --architecture=xxxxxxxxxx")
+ (args ? strlen (args) : 0)
+ 50) /* slack */ ;
arg_buf = (char *) alloca (len);
strcpy (arg_buf, "gdbsim"); /* 7 */
/* Specify the byte order for the target when it is explicitly
specified by the user (not auto detected). */
switch (selected_byte_order ())
{
case BFD_ENDIAN_BIG:
strcat (arg_buf, " -E big");
break;
case BFD_ENDIAN_LITTLE:
strcat (arg_buf, " -E little");
break;
case BFD_ENDIAN_UNKNOWN:
break;
}
/* Specify the architecture of the target when it has been
explicitly specified */
if (selected_architecture_name () != NULL)
{
strcat (arg_buf, " --architecture=");
strcat (arg_buf, selected_architecture_name ());
}
/* finally, any explicit args */
if (args)
{
strcat (arg_buf, " "); /* 1 */
strcat (arg_buf, args);
}
argv = gdb_buildargv (arg_buf);
make_cleanup_freeargv (argv);
init_callbacks ();
gdbsim_desc = sim_open (SIM_OPEN_DEBUG, &gdb_callback, exec_bfd, argv);
if (gdbsim_desc == 0)
error (_("unable to create simulator instance"));
push_target (&gdbsim_ops);
printf_filtered ("Connected to the simulator.\n");
/* There's nothing running after "target sim" or "load"; not until
"run". */
inferior_ptid = null_ptid;
target_mark_exited (&gdbsim_ops);
}
/* Does whatever cleanup is required for a target that we are no longer
going to be calling. Argument says whether we are quitting gdb and
should not get hung in case of errors, or whether we want a clean
termination even if it takes a while. This routine is automatically
always called just before a routine is popped off the target stack.
Closing file descriptors and freeing memory are typical things it should
do. */
/* Close out all files and local state before this target loses control. */
static void
gdbsim_close (int quitting)
{
if (remote_debug)
printf_filtered ("gdbsim_close: quitting %d\n", quitting);
program_loaded = 0;
if (gdbsim_desc != NULL)
{
sim_close (gdbsim_desc, quitting);
gdbsim_desc = NULL;
}
end_callbacks ();
generic_mourn_inferior ();
delete_thread_silent (remote_sim_ptid);
delete_inferior_silent (ptid_get_pid (remote_sim_ptid));
}
/* Takes a program previously attached to and detaches it.
The program may resume execution (some targets do, some don't) and will
no longer stop on signals, etc. We better not have left any breakpoints
in the program or it'll die when it hits one. ARGS is arguments
typed by the user (e.g. a signal to send the process). FROM_TTY
says whether to be verbose or not. */
/* Terminate the open connection to the remote debugger.
Use this when you want to detach and do something else with your gdb. */
static void
gdbsim_detach (struct target_ops *ops, char *args, int from_tty)
{
if (remote_debug)
printf_filtered ("gdbsim_detach: args \"%s\"\n", args);
pop_target (); /* calls gdbsim_close to do the real work */
if (from_tty)
printf_filtered ("Ending simulator %s debugging\n", target_shortname);
}
/* Resume execution of the target process. STEP says whether to single-step
or to run free; SIGGNAL is the signal value (e.g. SIGINT) to be given
to the target, or zero for no signal. */
static enum target_signal resume_siggnal;
static int resume_step;
static void
gdbsim_resume (ptid_t ptid, int step, enum target_signal siggnal)
{
if (!ptid_equal (inferior_ptid, remote_sim_ptid))
error (_("The program is not being run."));
if (remote_debug)
printf_filtered ("gdbsim_resume: step %d, signal %d\n", step, siggnal);
resume_siggnal = siggnal;
resume_step = step;
}
/* Notify the simulator of an asynchronous request to stop.
The simulator shall ensure that the stop request is eventually
delivered to the simulator. If the call is made while the
simulator is not running then the stop request is processed when
the simulator is next resumed.
For simulators that do not support this operation, just abort */
static void
gdbsim_stop (ptid_t ptid)
{
if (!sim_stop (gdbsim_desc))
{
quit ();
}
}
/* GDB version of os_poll_quit callback.
Taken from gdb/util.c - should be in a library. */
static int
gdb_os_poll_quit (host_callback *p)
{
if (deprecated_ui_loop_hook != NULL)
deprecated_ui_loop_hook (0);
if (quit_flag) /* gdb's idea of quit */
{
quit_flag = 0; /* we've stolen it */
return 1;
}
else if (immediate_quit)
{
return 1;
}
return 0;
}
/* Wait for inferior process to do something. Return pid of child,
or -1 in case of error; store status through argument pointer STATUS,
just as `wait' would. */
static void
gdbsim_cntrl_c (int signo)
{
gdbsim_stop (remote_sim_ptid);
}
static ptid_t
gdbsim_wait (ptid_t ptid, struct target_waitstatus *status)
{
static RETSIGTYPE (*prev_sigint) ();
int sigrc = 0;
enum sim_stop reason = sim_running;
if (remote_debug)
printf_filtered ("gdbsim_wait\n");
#if defined (HAVE_SIGACTION) && defined (SA_RESTART)
{
struct sigaction sa, osa;
sa.sa_handler = gdbsim_cntrl_c;
sigemptyset (&sa.sa_mask);
sa.sa_flags = 0;
sigaction (SIGINT, &sa, &osa);
prev_sigint = osa.sa_handler;
}
#else
prev_sigint = signal (SIGINT, gdbsim_cntrl_c);
#endif
sim_resume (gdbsim_desc, resume_step, resume_siggnal);
signal (SIGINT, prev_sigint);
resume_step = 0;
sim_stop_reason (gdbsim_desc, &reason, &sigrc);
switch (reason)
{
case sim_exited:
status->kind = TARGET_WAITKIND_EXITED;
status->value.integer = sigrc;
break;
case sim_stopped:
switch (sigrc)
{
case TARGET_SIGNAL_ABRT:
quit ();
break;
case TARGET_SIGNAL_INT:
case TARGET_SIGNAL_TRAP:
default:
status->kind = TARGET_WAITKIND_STOPPED;
status->value.sig = sigrc;
break;
}
break;
case sim_signalled:
status->kind = TARGET_WAITKIND_SIGNALLED;
status->value.sig = sigrc;
break;
case sim_running:
case sim_polling:
/* FIXME: Is this correct? */
break;
}
return inferior_ptid;
}
/* Get ready to modify the registers array. On machines which store
individual registers, this doesn't need to do anything. On machines
which store all the registers in one fell swoop, this makes sure
that registers contains all the registers from the program being
debugged. */
static void
gdbsim_prepare_to_store (struct regcache *regcache)
{
/* Do nothing, since we can store individual regs */
}
/* Transfer LEN bytes between GDB address MYADDR and target address
MEMADDR. If WRITE is non-zero, transfer them to the target,
otherwise transfer them from the target. TARGET is unused.
Returns the number of bytes transferred. */
static int
gdbsim_xfer_inferior_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len,
int write, struct mem_attrib *attrib,
struct target_ops *target)
{
/* If no program is running yet, then ignore the simulator for
memory. Pass the request down to the next target, hopefully
an exec file. */
if (!target_has_execution)
return 0;
if (!program_loaded)
error (_("No program loaded."));
if (remote_debug)
{
/* FIXME: Send to something other than STDOUT? */
printf_filtered ("gdbsim_xfer_inferior_memory: myaddr 0x");
gdb_print_host_address (myaddr, gdb_stdout);
printf_filtered (", memaddr 0x%s, len %d, write %d\n",
paddr_nz (memaddr), len, write);
if (remote_debug && write)
dump_mem (myaddr, len);
}
if (write)
{
len = sim_write (gdbsim_desc, memaddr, myaddr, len);
}
else
{
len = sim_read (gdbsim_desc, memaddr, myaddr, len);
if (remote_debug && len > 0)
dump_mem (myaddr, len);
}
return len;
}
static void
gdbsim_files_info (struct target_ops *target)
{
char *file = "nothing";
if (exec_bfd)
file = bfd_get_filename (exec_bfd);
if (remote_debug)
printf_filtered ("gdbsim_files_info: file \"%s\"\n", file);
if (exec_bfd)
{
printf_filtered ("\tAttached to %s running program %s\n",
target_shortname, file);
sim_info (gdbsim_desc, 0);
}
}
/* Clear the simulator's notion of what the break points are. */
static void
gdbsim_mourn_inferior (struct target_ops *target)
{
if (remote_debug)
printf_filtered ("gdbsim_mourn_inferior:\n");
remove_breakpoints ();
target_mark_exited (&gdbsim_ops);
generic_mourn_inferior ();
delete_thread_silent (remote_sim_ptid);
}
/* Pass the command argument through to the simulator verbatim. The
simulator must do any command interpretation work. */
void
simulator_command (char *args, int from_tty)
{
if (gdbsim_desc == NULL)
{
/* PREVIOUSLY: The user may give a command before the simulator
is opened. [...] (??? assuming of course one wishes to
continue to allow commands to be sent to unopened simulators,
which isn't entirely unreasonable). */
/* The simulator is a builtin abstraction of a remote target.
Consistent with that model, access to the simulator, via sim
commands, is restricted to the period when the channel to the
simulator is open. */
error (_("Not connected to the simulator target"));
}
sim_do_command (gdbsim_desc, args);
/* Invalidate the register cache, in case the simulator command does
something funny. */
registers_changed ();
}
/* Check to see if a thread is still alive. */
static int
gdbsim_thread_alive (ptid_t ptid)
{
if (ptid_equal (ptid, remote_sim_ptid))
/* The simulators' task is always alive. */
return 1;
return 0;
}
/* Convert a thread ID to a string. Returns the string in a static
buffer. */
static char *
gdbsim_pid_to_str (ptid_t ptid)
{
static char buf[64];
if (ptid_equal (remote_sim_ptid, ptid))
{
xsnprintf (buf, sizeof buf, "Thread <main>");
return buf;
}
return normal_pid_to_str (ptid);
}
/* Define the target subroutine names */
struct target_ops gdbsim_ops;
static void
init_gdbsim_ops (void)
{
gdbsim_ops.to_shortname = "sim";
gdbsim_ops.to_longname = "simulator";
gdbsim_ops.to_doc = "Use the compiled-in simulator.";
gdbsim_ops.to_open = gdbsim_open;
gdbsim_ops.to_close = gdbsim_close;
gdbsim_ops.to_detach = gdbsim_detach;
gdbsim_ops.to_resume = gdbsim_resume;
gdbsim_ops.to_wait = gdbsim_wait;
gdbsim_ops.to_fetch_registers = gdbsim_fetch_register;
gdbsim_ops.to_store_registers = gdbsim_store_register;
gdbsim_ops.to_prepare_to_store = gdbsim_prepare_to_store;
gdbsim_ops.deprecated_xfer_memory = gdbsim_xfer_inferior_memory;
gdbsim_ops.to_files_info = gdbsim_files_info;
gdbsim_ops.to_insert_breakpoint = memory_insert_breakpoint;
gdbsim_ops.to_remove_breakpoint = memory_remove_breakpoint;
gdbsim_ops.to_kill = gdbsim_kill;
gdbsim_ops.to_load = gdbsim_load;
gdbsim_ops.to_create_inferior = gdbsim_create_inferior;
gdbsim_ops.to_mourn_inferior = gdbsim_mourn_inferior;
gdbsim_ops.to_stop = gdbsim_stop;
gdbsim_ops.to_thread_alive = gdbsim_thread_alive;
gdbsim_ops.to_pid_to_str = gdbsim_pid_to_str;
gdbsim_ops.to_stratum = process_stratum;
gdbsim_ops.to_has_all_memory = 1;
gdbsim_ops.to_has_memory = 1;
gdbsim_ops.to_has_stack = 1;
gdbsim_ops.to_has_registers = 1;
gdbsim_ops.to_has_execution = 1;
gdbsim_ops.to_magic = OPS_MAGIC;
}
void
_initialize_remote_sim (void)
{
init_gdbsim_ops ();
add_target (&gdbsim_ops);
add_com ("sim", class_obscure, simulator_command,
_("Send a command to the simulator."));
/* Yes, 42000 is arbitrary. The only sense out of it, is that it
isn't 0. */
remote_sim_ptid = ptid_build (42000, 0, 42000);
}
|