summaryrefslogtreecommitdiff
path: root/sim/ppc/sim_calls.c
blob: bb845397152c318dbbaf02450eb95848d5e2e0a3 (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
/*  This file is part of the program psim.

    Copyright (C) 1994-1996,1998, Andrew Cagney <cagney@highland.com.au>

    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 <signal.h> /* FIXME - should be machine dependant version */
#include <stdarg.h>
#include <ctype.h>

#include "psim.h"
#include "options.h"

#undef printf_filtered /* blow away the mapping */

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

#ifdef HAVE_STRING_H
#include <string.h>
#else
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#endif

#include "defs.h"
#include "bfd.h"
#include "callback.h"
#include "remote-sim.h"


/* Structures used by the simulator, for gdb just have static structures */

static psim *simulator;
static device *root_device;
static host_callback *callbacks;

/* We use GDB's reg_names array to map GDB register numbers onto
   names, which we can then look up in the register table.

   We used to just use the REGISTER_NAMES macro, from GDB's
   target-dependent header files.  That was kind of nice, because it
   meant that libsim.a had only a compile-time dependency on GDB;
   using reg_names directly means that there are now link-time and
   run-time dependencies too.

   However, the GDB PPC back-end now modifies the reg_names array when
   the user runs the `set processor' command, which affects the
   meanings of the register numbers.  So the sim needs to see the
   register names GDB is actually using.

   Perhaps the host_callback structure could contain a pointer to the
   register name table; that would be cleaner.  */

SIM_DESC
sim_open (SIM_OPEN_KIND kind,
	  host_callback *callback,
	  struct _bfd *abfd,
	  char **argv)
{
  callbacks = callback;

  /* Note: The simulation is not created by sim_open() because
     complete information is not yet available */
  /* trace the call */
  TRACE(trace_gdb, ("sim_open called\n"));

  if (root_device != NULL)
    sim_io_printf_filtered("Warning - re-open of simulator leaks memory\n");
  root_device = psim_tree();
  simulator = NULL;

  psim_options(root_device, argv + 1);

  if (ppc_trace[trace_opts])
    print_options ();

  /* fudge our descriptor for now */
  return (SIM_DESC) 1;
}


void
sim_close (SIM_DESC sd, int quitting)
{
  TRACE(trace_gdb, ("sim_close(quitting=%d) called\n", quitting));
  if (ppc_trace[trace_print_info] && simulator != NULL)
    psim_print_info (simulator, ppc_trace[trace_print_info]);
}


SIM_RC
sim_load (SIM_DESC sd, char *prog, bfd *abfd, int from_tty)
{
  TRACE(trace_gdb, ("sim_load(prog=%s, from_tty=%d) called\n",
		    prog, from_tty));
  ASSERT(prog != NULL);

  /* create the simulator */
  TRACE(trace_gdb, ("sim_load() - first time, create the simulator\n"));
  simulator = psim_create(prog, root_device);

  /* bring in all the data section */
  psim_init(simulator);

  /* get the start address */
  if (abfd == NULL)
    {
      abfd = bfd_openr (prog, 0);
      if (abfd == NULL)
	error ("psim: can't open \"%s\": %s\n", 
	       prog, bfd_errmsg (bfd_get_error ()));
      if (!bfd_check_format (abfd, bfd_object)) 
	{
	  const char *errmsg = bfd_errmsg (bfd_get_error ());
	  bfd_close (abfd);
	  error ("psim: \"%s\" is not an object file: %s\n",
		 prog, errmsg);
	}
      bfd_close (abfd);
    }

  return SIM_RC_OK;
}


int
sim_read (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)
{
  int result = psim_read_memory(simulator, MAX_NR_PROCESSORS,
				buf, mem, length);
  TRACE(trace_gdb, ("sim_read(mem=0x%lx, buf=0x%lx, length=%d) = %d\n",
		    (long)mem, (long)buf, length, result));
  return result;
}


int
sim_write (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)
{
  int result = psim_write_memory(simulator, MAX_NR_PROCESSORS,
				 buf, mem, length,
				 1/*violate_ro*/);
  TRACE(trace_gdb, ("sim_write(mem=0x%lx, buf=0x%lx, length=%d) = %d\n",
		    (long)mem, (long)buf, length, result));
  return result;
}


int
sim_fetch_register (SIM_DESC sd, int regno, unsigned char *buf, int length)
{
  char *regname;

  if (simulator == NULL) {
    return 0;
  }

  /* GDB will sometimes ask for the contents of a register named "";
     we ignore such requests, and leave garbage in *BUF.  In
     REG_NAMES, the empty string means "the register with this
     number is not present in the currently selected architecture
     variant."  That's following the kludge we're using for the MIPS
     processors.  But there are loops that just walk through the
     entire list of names and try to get everything.  */
  regname = REGISTER_NAME (regno);
  if (! regname || regname[0] == '\0')
    return -1;

  TRACE(trace_gdb, ("sim_fetch_register(regno=%d(%s), buf=0x%lx)\n",
		    regno, regname, (long)buf));
  psim_read_register(simulator, MAX_NR_PROCESSORS,
		     buf, regname, raw_transfer);
  return -1;
}


int
sim_store_register (SIM_DESC sd, int regno, unsigned char *buf, int length)
{
  char *regname;

  if (simulator == NULL)
    return 0;

  /* See comments in sim_fetch_register, above.  */
  regname = REGISTER_NAME (regno);
  if (! regname || regname[0] == '\0')
    return -1;

  TRACE(trace_gdb, ("sim_store_register(regno=%d(%s), buf=0x%lx)\n",
		    regno, regname, (long)buf));
  psim_write_register(simulator, MAX_NR_PROCESSORS,
		      buf, regname, raw_transfer);
  return -1;
}


void
sim_info (SIM_DESC sd, int verbose)
{
  TRACE(trace_gdb, ("sim_info(verbose=%d) called\n", verbose));
  psim_print_info (simulator, verbose);
}


SIM_RC
sim_create_inferior (SIM_DESC sd,
		     struct _bfd *abfd,
		     char **argv,
		     char **envp)
{
  unsigned_word entry_point;
  TRACE(trace_gdb, ("sim_create_inferior(start_address=0x%x, ...)\n",
		    entry_point));

  if (simulator == NULL)
    error ("No program loaded");

  if (abfd != NULL)
    entry_point = bfd_get_start_address (abfd);
  else
    entry_point = 0xfff00000; /* ??? */

  psim_init(simulator);
  psim_stack(simulator, argv, envp);

  psim_write_register(simulator, -1 /* all start at same PC */,
		      &entry_point, "pc", cooked_transfer);
  return SIM_RC_OK;
}


void
sim_stop_reason (SIM_DESC sd, enum sim_stop *reason, int *sigrc)
{
  psim_status status = psim_get_status(simulator);

  switch (status.reason) {
  case was_continuing:
    *reason = sim_stopped;
    if (status.signal == 0)
      *sigrc = SIGTRAP;
    else
      *sigrc = status.signal;
    break;
  case was_trap:
    *reason = sim_stopped;
    *sigrc = SIGTRAP;
    break;
  case was_exited:
    *reason = sim_exited;
    *sigrc = status.signal;
    break;
  case was_signalled:
    *reason = sim_signalled;
    *sigrc = status.signal;
    break;
  }

  TRACE(trace_gdb, ("sim_stop_reason(reason=0x%lx(%ld), sigrc=0x%lx(%ld))\n",
		    (long)reason, (long)*reason, (long)sigrc, (long)*sigrc));
}



/* Run (or resume) the program.  */

int
sim_stop (SIM_DESC sd)
{
  psim_stop (simulator);
  return 1;
}

void
sim_resume (SIM_DESC sd, int step, int siggnal)
{
  TRACE(trace_gdb, ("sim_resume(step=%d, siggnal=%d)\n",
		    step, siggnal));

  if (step)
    {
      psim_step (simulator);
    }
  else
    {
      psim_run (simulator);
    }
}

void
sim_do_command (SIM_DESC sd, char *cmd)
{
  TRACE(trace_gdb, ("sim_do_commands(cmd=%s) called\n",
		    cmd ? cmd : "(null)"));
  if (cmd != NULL) {
    char **argv = buildargv(cmd);
    psim_command(root_device, argv);
    freeargv(argv);
  }
}


/* Polling, if required */

void
sim_io_poll_quit (void)
{
  if (callbacks->poll_quit != NULL)
    {
      if (callbacks->poll_quit (callbacks))
	psim_stop (simulator);
    }
}



/* Map simulator IO operations onto the corresponding GDB I/O
   functions.
   
   NB: Only a limited subset of operations are mapped across.  More
   advanced operations (such as dup or write) must either be mapped to
   one of the below calls or handled internally */

int
sim_io_read_stdin(char *buf,
		  int sizeof_buf)
{
  switch (CURRENT_STDIO) {
  case DO_USE_STDIO:
    return callbacks->read_stdin(callbacks, buf, sizeof_buf);
    break;
  case DONT_USE_STDIO:
    return callbacks->read(callbacks, 0, buf, sizeof_buf);
    break;
  default:
    error("sim_io_read_stdin: unaccounted switch\n");
    break;
  }
  return 0;
}

int
sim_io_write_stdout(const char *buf,
		    int sizeof_buf)
{
  switch (CURRENT_STDIO) {
  case DO_USE_STDIO:
    return callbacks->write_stdout(callbacks, buf, sizeof_buf);
    break;
  case DONT_USE_STDIO:
    return callbacks->write(callbacks, 1, buf, sizeof_buf);
    break;
  default:
    error("sim_io_write_stdout: unaccounted switch\n");
    break;
  }
  return 0;
}

int
sim_io_write_stderr(const char *buf,
		    int sizeof_buf)
{
  switch (CURRENT_STDIO) {
  case DO_USE_STDIO:
    /* NB: I think there should be an explicit write_stderr callback */
    return callbacks->write(callbacks, 3, buf, sizeof_buf);
    break;
  case DONT_USE_STDIO:
    return callbacks->write(callbacks, 3, buf, sizeof_buf);
    break;
  default:
    error("sim_io_write_stderr: unaccounted switch\n");
    break;
  }
  return 0;
}


void
sim_io_printf_filtered(const char *fmt,
		       ...)
{
  char message[1024];
  va_list ap;
  /* format the message */
  va_start(ap, fmt);
  vsprintf(message, fmt, ap);
  va_end(ap);
  /* sanity check */
  if (strlen(message) >= sizeof(message))
    error("sim_io_printf_filtered: buffer overflow\n");
  callbacks->printf_filtered(callbacks, "%s", message);
}

void
sim_io_flush_stdoutput(void)
{
  switch (CURRENT_STDIO) {
  case DO_USE_STDIO:
    callbacks->flush_stdout (callbacks);
    break;
  case DONT_USE_STDIO:
    break;
  default:
    error("sim_io_read_stdin: unaccounted switch\n");
    break;
  }
}

/****/

void *
zalloc(long size)
{
  void *memory = (void*)xmalloc(size);
  if (memory == NULL)
    error("xmalloc failed\n");
  memset(memory, 0, size);
  return memory;
}

void zfree(void *data)
{
  free(data);
}