sim/ppc/sim_calls.c

   1 /*  This file is part of the program psim.
   2
   3     Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18
  19     */
  20
  21
  22 #include <signal.h> /* FIXME - should be machine dependant version */
  23 #include <stdarg.h>
  24 #include <ctype.h>
  25
  26 #include "psim.h"
  27 #include "options.h"
  28
  29 #undef printf_filtered /* blow away the mapping */
  30
  31 #ifdef HAVE_STDLIB_H
  32 #include <stdlib.h>
  33 #endif
  34
  35 #ifdef HAVE_STRING_H
  36 #include <string.h>
  37 #else
  38 #ifdef HAVE_STRINGS_H
  39 #include <strings.h>
  40 #endif
  41 #endif
  42
  43 #include "defs.h"
  44 #include "bfd.h"
  45 #include "callback.h"
  46 #include "remote-sim.h"
  47
  48
  49 /* Structures used by the simulator, for gdb just have static structures */
  50
  51 static psim *simulator;
  52 static device *root_device;
  53 static const char *register_names[] = REGISTER_NAMES;
  54
  55 /* For communication between sim_load and sim_create_inferior.
  56    This can be made to go away, please do.  */
  57 static unsigned_word entry_point;
  58
  59 SIM_DESC
  60 sim_open (SIM_OPEN_KIND kind, char **argv)
  61 {
  62   /* Note: The simulation is not created by sim_open() because
  63      complete information is not yet available */
  64   /* trace the call */
  65   TRACE(trace_gdb, ("sim_open called\n"));
  66
  67   if (root_device != NULL)
  68     sim_io_printf_filtered("Warning - re-open of simulator leaks memory\n");
  69   root_device = psim_tree();
  70   simulator = NULL;
  71
  72   psim_options(root_device, argv + 1);
  73
  74   if (ppc_trace[trace_opts])
  75     print_options ();
  76
  77   /* fudge our descriptor for now */
  78   return (SIM_DESC) 1;
  79 }
  80
  81
  82 void
  83 sim_close (SIM_DESC sd, int quitting)
  84 {
  85   TRACE(trace_gdb, ("sim_close(quitting=%d) called\n", quitting));
  86   if (ppc_trace[trace_print_info] && simulator != NULL)
  87     psim_print_info (simulator, ppc_trace[trace_print_info]);
  88 }
  89
  90
  91 SIM_RC
  92 sim_load (SIM_DESC sd, char *prog, bfd *abfd, int from_tty)
  93 {
  94   char **argv;
  95   TRACE(trace_gdb, ("sim_load(prog=%s, from_tty=%d) called\n",
  96                     prog, from_tty));
  97   ASSERT(prog != NULL);
  98
  99   /* parse the arguments, assume that the file is argument 0 */
 100   argv = buildargv(prog);
 101   ASSERT(argv != NULL && argv[0] != NULL);
 102
 103   /* create the simulator */
 104   TRACE(trace_gdb, ("sim_load() - first time, create the simulator\n"));
 105   simulator = psim_create(argv[0], root_device);
 106
 107   /* bring in all the data section */
 108   psim_init(simulator);
 109
 110   /* release the arguments */
 111   freeargv(argv);
 112
 113   /* get the start address */
 114   if (abfd != NULL)
 115     entry_point = bfd_get_start_address (abfd);
 116   else
 117     {
 118       abfd = bfd_openr (argv[0], 0);
 119       if (abfd == NULL)
 120         error ("psim: can't open \"%s\": %s\n",
 121                argv[0], bfd_errmsg (bfd_get_error ()));
 122       if (!bfd_check_format (abfd, bfd_object))
 123         {
 124           const char *errmsg = bfd_errmsg (bfd_get_error ());
 125           bfd_close (abfd);
 126           error ("psim: \"%s\" is not an object file: %s\n",
 127                  argv[0], errmsg);
 128         }
 129       entry_point = bfd_get_start_address (abfd);
 130       bfd_close (abfd);
 131     }
 132
 133   return SIM_RC_OK;
 134 }
 135
 136
 137 void
 138 sim_kill (SIM_DESC sd)
 139 {
 140   TRACE(trace_gdb, ("sim_kill(void) called\n"));
 141   /* do nothing, nothing to do */
 142 }
 143
 144
 145 int
 146 sim_read (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)
 147 {
 148   int result = psim_read_memory(simulator, MAX_NR_PROCESSORS,
 149                                 buf, mem, length);
 150   TRACE(trace_gdb, ("sim_read(mem=0x%lx, buf=0x%lx, length=%d) = %d\n",
 151                     (long)mem, (long)buf, length, result));
 152   return result;
 153 }
 154
 155
 156 int
 157 sim_write (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)
 158 {
 159   int result = psim_write_memory(simulator, MAX_NR_PROCESSORS,
 160                                  buf, mem, length,
 161                                  1/*violate_ro*/);
 162   TRACE(trace_gdb, ("sim_write(mem=0x%lx, buf=0x%lx, length=%d) = %d\n",
 163                     (long)mem, (long)buf, length, result));
 164   return result;
 165 }
 166
 167
 168 void
 169 sim_fetch_register (SIM_DESC sd, int regno, unsigned char *buf)
 170 {
 171   if (simulator == NULL) {
 172     return;
 173   }
 174   TRACE(trace_gdb, ("sim_fetch_register(regno=%d(%s), buf=0x%lx)\n",
 175                     regno, register_names[regno], (long)buf));
 176   psim_read_register(simulator, MAX_NR_PROCESSORS,
 177                      buf, register_names[regno],
 178                      raw_transfer);
 179 }
 180
 181
 182 void
 183 sim_store_register (SIM_DESC sd, int regno, unsigned char *buf)
 184 {
 185   if (simulator == NULL)
 186     return;
 187   TRACE(trace_gdb, ("sim_store_register(regno=%d(%s), buf=0x%lx)\n",
 188                     regno, register_names[regno], (long)buf));
 189   psim_write_register(simulator, MAX_NR_PROCESSORS,
 190                       buf, register_names[regno],
 191                       raw_transfer);
 192 }
 193
 194
 195 void
 196 sim_info (SIM_DESC sd, int verbose)
 197 {
 198   TRACE(trace_gdb, ("sim_info(verbose=%d) called\n", verbose));
 199   psim_print_info (simulator, verbose);
 200 }
 201
 202
 203 SIM_RC
 204 sim_create_inferior (SIM_DESC sd, char **argv, char **envp)
 205 {
 206   TRACE(trace_gdb, ("sim_create_inferior(start_address=0x%x, ...)\n",
 207                     entry_point));
 208
 209   psim_init(simulator);
 210   psim_stack(simulator, argv, envp);
 211
 212   psim_write_register(simulator, -1 /* all start at same PC */,
 213                       &entry_point, "pc", cooked_transfer);
 214   return SIM_RC_OK;
 215 }
 216
 217
 218 static volatile int sim_should_run;
 219
 220 void
 221 sim_stop_reason (SIM_DESC sd, enum sim_stop *reason, int *sigrc)
 222 {
 223   psim_status status = psim_get_status(simulator);
 224
 225   switch (CURRENT_ENVIRONMENT) {
 226
 227   case USER_ENVIRONMENT:
 228   case VIRTUAL_ENVIRONMENT:
 229     switch (status.reason) {
 230     case was_continuing:
 231       *reason = sim_stopped;
 232       *sigrc = SIGTRAP;
 233       if (sim_should_run) {
 234         error("sim_stop_reason() unknown reason for halt\n");
 235       }
 236       break;
 237     case was_trap:
 238       *reason = sim_stopped;
 239       *sigrc = SIGTRAP;
 240       break;
 241     case was_exited:
 242       *reason = sim_exited;
 243       *sigrc = 0;
 244       break;
 245     case was_signalled:
 246       *reason = sim_signalled;
 247       *sigrc = status.signal;
 248       break;
 249     }
 250     break;
 251
 252   case OPERATING_ENVIRONMENT:
 253     *reason = sim_stopped;
 254     *sigrc = SIGTRAP;
 255     break;
 256
 257   default:
 258     error("sim_stop_reason() - unknown environment\n");
 259
 260   }
 261
 262   TRACE(trace_gdb, ("sim_stop_reason(reason=0x%lx(%ld), sigrc=0x%lx(%ld))\n",
 263                     (long)reason, (long)*reason, (long)sigrc, (long)*sigrc));
 264 }
 265
 266
 267
 268 /* Run (or resume) the program.  */
 269 static RETSIGTYPE
 270 sim_ctrl_c(int sig)
 271 {
 272   sim_should_run = 0;
 273 }
 274
 275 void
 276 sim_resume (SIM_DESC sd, int step, int siggnal)
 277 {
 278   TRACE(trace_gdb, ("sim_resume(step=%d, siggnal=%d)\n",
 279                     step, siggnal));
 280
 281   if (step)
 282     {
 283       psim_step(simulator);
 284       /* sim_stop_reason has a sanity check for stopping while
 285          was_continuing.  We don't want that here so reset sim_should_run.  */
 286       sim_should_run = 0;
 287     }
 288   else
 289     {
 290       RETSIGTYPE (*prev) ();
 291
 292       prev = signal(SIGINT, sim_ctrl_c);
 293       sim_should_run = 1;
 294       psim_run_until_stop(simulator, &sim_should_run);
 295       signal(SIGINT, prev);
 296     }
 297 }
 298
 299 void
 300 sim_do_command (SIM_DESC sd, char *cmd)
 301 {
 302   TRACE(trace_gdb, ("sim_do_commands(cmd=%s) called\n",
 303                     cmd ? cmd : "(null)"));
 304   if (cmd != NULL) {
 305     char **argv = buildargv(cmd);
 306     psim_command(root_device, argv);
 307     freeargv(argv);
 308   }
 309 }
 310
 311
 312 /* Map simulator IO operations onto the corresponding GDB I/O
 313    functions.
 314
 315    NB: Only a limited subset of operations are mapped across.  More
 316    advanced operations (such as dup or write) must either be mapped to
 317    one of the below calls or handled internally */
 318
 319 static host_callback *callbacks;
 320
 321 int
 322 sim_io_read_stdin(char *buf,
 323                   int sizeof_buf)
 324 {
 325   switch (CURRENT_STDIO) {
 326   case DO_USE_STDIO:
 327     return callbacks->read_stdin(callbacks, buf, sizeof_buf);
 328     break;
 329   case DONT_USE_STDIO:
 330     return callbacks->read(callbacks, 0, buf, sizeof_buf);
 331     break;
 332   default:
 333     error("sim_io_read_stdin: unaccounted switch\n");
 334     break;
 335   }
 336   return 0;
 337 }
 338
 339 int
 340 sim_io_write_stdout(const char *buf,
 341                     int sizeof_buf)
 342 {
 343   switch (CURRENT_STDIO) {
 344   case DO_USE_STDIO:
 345     return callbacks->write_stdout(callbacks, buf, sizeof_buf);
 346     break;
 347   case DONT_USE_STDIO:
 348     return callbacks->write(callbacks, 1, buf, sizeof_buf);
 349     break;
 350   default:
 351     error("sim_io_write_stdout: unaccounted switch\n");
 352     break;
 353   }
 354   return 0;
 355 }
 356
 357 int
 358 sim_io_write_stderr(const char *buf,
 359                     int sizeof_buf)
 360 {
 361   switch (CURRENT_STDIO) {
 362   case DO_USE_STDIO:
 363     /* NB: I think there should be an explicit write_stderr callback */
 364     return callbacks->write(callbacks, 3, buf, sizeof_buf);
 365     break;
 366   case DONT_USE_STDIO:
 367     return callbacks->write(callbacks, 3, buf, sizeof_buf);
 368     break;
 369   default:
 370     error("sim_io_write_stderr: unaccounted switch\n");
 371     break;
 372   }
 373   return 0;
 374 }
 375
 376
 377 void
 378 sim_io_printf_filtered(const char *fmt,
 379                        ...)
 380 {
 381   char message[1024];
 382   va_list ap;
 383   /* format the message */
 384   va_start(ap, fmt);
 385   vsprintf(message, fmt, ap);
 386   va_end(ap);
 387   /* sanity check */
 388   if (strlen(message) >= sizeof(message))
 389     error("sim_io_printf_filtered: buffer overflow\n");
 390   callbacks->printf_filtered(callbacks, "%s", message);
 391 }
 392
 393 void
 394 sim_io_flush_stdoutput(void)
 395 {
 396   switch (CURRENT_STDIO) {
 397   case DO_USE_STDIO:
 398     gdb_flush (gdb_stdout);
 399     break;
 400   case DONT_USE_STDIO:
 401     break;
 402   default:
 403     error("sim_io_read_stdin: unaccounted switch\n");
 404     break;
 405   }
 406 }
 407
 408 void
 409 sim_set_callbacks (SIM_DESC sd, host_callback *callback)
 410 {
 411   callbacks = callback;
 412   TRACE(trace_gdb, ("sim_set_callbacks called\n"));
 413 }
 414
 415 /****/
 416
 417 void *
 418 zalloc(long size)
 419 {
 420   void *memory = (void*)xmalloc(size);
 421   if (memory == NULL)
 422     error("xmalloc failed\n");
 423   memset(memory, 0, size);
 424   return memory;
 425 }
 426
 427 void zfree(void *data)
 428 {
 429   mfree(NULL, data);
 430 }