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, host_callback *callback, char **argv)
  61 {
  62   callbacks = callback;
  63
  64   /* Note: The simulation is not created by sim_open() because
  65      complete information is not yet available */
  66   /* trace the call */
  67   TRACE(trace_gdb, ("sim_open called\n"));
  68
  69   if (root_device != NULL)
  70     sim_io_printf_filtered("Warning - re-open of simulator leaks memory\n");
  71   root_device = psim_tree();
  72   simulator = NULL;
  73
  74   psim_options(root_device, argv + 1);
  75
  76   if (ppc_trace[trace_opts])
  77     print_options ();
  78
  79   /* fudge our descriptor for now */
  80   return (SIM_DESC) 1;
  81 }
  82
  83
  84 void
  85 sim_close (SIM_DESC sd, int quitting)
  86 {
  87   TRACE(trace_gdb, ("sim_close(quitting=%d) called\n", quitting));
  88   if (ppc_trace[trace_print_info] && simulator != NULL)
  89     psim_print_info (simulator, ppc_trace[trace_print_info]);
  90 }
  91
  92
  93 SIM_RC
  94 sim_load (SIM_DESC sd, char *prog, bfd *abfd, int from_tty)
  95 {
  96   char **argv;
  97   TRACE(trace_gdb, ("sim_load(prog=%s, from_tty=%d) called\n",
  98                     prog, from_tty));
  99   ASSERT(prog != NULL);
 100
 101   /* parse the arguments, assume that the file is argument 0 */
 102   argv = buildargv(prog);
 103   ASSERT(argv != NULL && argv[0] != NULL);
 104
 105   /* create the simulator */
 106   TRACE(trace_gdb, ("sim_load() - first time, create the simulator\n"));
 107   simulator = psim_create(argv[0], root_device);
 108
 109   /* bring in all the data section */
 110   psim_init(simulator);
 111
 112   /* release the arguments */
 113   freeargv(argv);
 114
 115   /* get the start address */
 116   if (abfd != NULL)
 117     entry_point = bfd_get_start_address (abfd);
 118   else
 119     {
 120       abfd = bfd_openr (argv[0], 0);
 121       if (abfd == NULL)
 122         error ("psim: can't open \"%s\": %s\n",
 123                argv[0], bfd_errmsg (bfd_get_error ()));
 124       if (!bfd_check_format (abfd, bfd_object))
 125         {
 126           const char *errmsg = bfd_errmsg (bfd_get_error ());
 127           bfd_close (abfd);
 128           error ("psim: \"%s\" is not an object file: %s\n",
 129                  argv[0], errmsg);
 130         }
 131       entry_point = bfd_get_start_address (abfd);
 132       bfd_close (abfd);
 133     }
 134
 135   return SIM_RC_OK;
 136 }
 137
 138
 139 void
 140 sim_kill (SIM_DESC sd)
 141 {
 142   TRACE(trace_gdb, ("sim_kill(void) called\n"));
 143   /* do nothing, nothing to do */
 144 }
 145
 146
 147 int
 148 sim_read (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)
 149 {
 150   int result = psim_read_memory(simulator, MAX_NR_PROCESSORS,
 151                                 buf, mem, length);
 152   TRACE(trace_gdb, ("sim_read(mem=0x%lx, buf=0x%lx, length=%d) = %d\n",
 153                     (long)mem, (long)buf, length, result));
 154   return result;
 155 }
 156
 157
 158 int
 159 sim_write (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)
 160 {
 161   int result = psim_write_memory(simulator, MAX_NR_PROCESSORS,
 162                                  buf, mem, length,
 163                                  1/*violate_ro*/);
 164   TRACE(trace_gdb, ("sim_write(mem=0x%lx, buf=0x%lx, length=%d) = %d\n",
 165                     (long)mem, (long)buf, length, result));
 166   return result;
 167 }
 168
 169
 170 void
 171 sim_fetch_register (SIM_DESC sd, int regno, unsigned char *buf)
 172 {
 173   if (simulator == NULL) {
 174     return;
 175   }
 176   TRACE(trace_gdb, ("sim_fetch_register(regno=%d(%s), buf=0x%lx)\n",
 177                     regno, register_names[regno], (long)buf));
 178   psim_read_register(simulator, MAX_NR_PROCESSORS,
 179                      buf, register_names[regno],
 180                      raw_transfer);
 181 }
 182
 183
 184 void
 185 sim_store_register (SIM_DESC sd, int regno, unsigned char *buf)
 186 {
 187   if (simulator == NULL)
 188     return;
 189   TRACE(trace_gdb, ("sim_store_register(regno=%d(%s), buf=0x%lx)\n",
 190                     regno, register_names[regno], (long)buf));
 191   psim_write_register(simulator, MAX_NR_PROCESSORS,
 192                       buf, register_names[regno],
 193                       raw_transfer);
 194 }
 195
 196
 197 void
 198 sim_info (SIM_DESC sd, int verbose)
 199 {
 200   TRACE(trace_gdb, ("sim_info(verbose=%d) called\n", verbose));
 201   psim_print_info (simulator, verbose);
 202 }
 203
 204
 205 SIM_RC
 206 sim_create_inferior (SIM_DESC sd, char **argv, char **envp)
 207 {
 208   TRACE(trace_gdb, ("sim_create_inferior(start_address=0x%x, ...)\n",
 209                     entry_point));
 210
 211   psim_init(simulator);
 212   psim_stack(simulator, argv, envp);
 213
 214   psim_write_register(simulator, -1 /* all start at same PC */,
 215                       &entry_point, "pc", cooked_transfer);
 216   return SIM_RC_OK;
 217 }
 218
 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 (status.reason) {
 226   case was_continuing:
 227     *reason = sim_stopped;
 228     if (status.signal == 0)
 229       *sigrc = SIGTRAP;
 230     else
 231       *sigrc = status.signal;
 232     break;
 233   case was_trap:
 234     *reason = sim_stopped;
 235     *sigrc = SIGTRAP;
 236     break;
 237   case was_exited:
 238     *reason = sim_exited;
 239     *sigrc = status.signal;
 240     break;
 241   case was_signalled:
 242     *reason = sim_signalled;
 243     *sigrc = status.signal;
 244     break;
 245   }
 246
 247   TRACE(trace_gdb, ("sim_stop_reason(reason=0x%lx(%ld), sigrc=0x%lx(%ld))\n",
 248                     (long)reason, (long)*reason, (long)sigrc, (long)*sigrc));
 249 }
 250
 251
 252
 253 /* Run (or resume) the program.  */
 254
 255 int
 256 sim_stop (SIM_DESC sd)
 257 {
 258   psim_stop (simulator);
 259   return 1;
 260 }
 261
 262 void
 263 sim_resume (SIM_DESC sd, int step, int siggnal)
 264 {
 265   TRACE(trace_gdb, ("sim_resume(step=%d, siggnal=%d)\n",
 266                     step, siggnal));
 267
 268   if (step)
 269     {
 270       psim_step (simulator);
 271     }
 272   else
 273     {
 274       psim_run (simulator);
 275     }
 276 }
 277
 278 void
 279 sim_do_command (SIM_DESC sd, char *cmd)
 280 {
 281   TRACE(trace_gdb, ("sim_do_commands(cmd=%s) called\n",
 282                     cmd ? cmd : "(null)"));
 283   if (cmd != NULL) {
 284     char **argv = buildargv(cmd);
 285     psim_command(root_device, argv);
 286     freeargv(argv);
 287   }
 288 }
 289
 290
 291 /* Map simulator IO operations onto the corresponding GDB I/O
 292    functions.
 293
 294    NB: Only a limited subset of operations are mapped across.  More
 295    advanced operations (such as dup or write) must either be mapped to
 296    one of the below calls or handled internally */
 297
 298 static host_callback *callbacks;
 299
 300 int
 301 sim_io_read_stdin(char *buf,
 302                   int sizeof_buf)
 303 {
 304   switch (CURRENT_STDIO) {
 305   case DO_USE_STDIO:
 306     return callbacks->read_stdin(callbacks, buf, sizeof_buf);
 307     break;
 308   case DONT_USE_STDIO:
 309     return callbacks->read(callbacks, 0, buf, sizeof_buf);
 310     break;
 311   default:
 312     error("sim_io_read_stdin: unaccounted switch\n");
 313     break;
 314   }
 315   return 0;
 316 }
 317
 318 int
 319 sim_io_write_stdout(const char *buf,
 320                     int sizeof_buf)
 321 {
 322   switch (CURRENT_STDIO) {
 323   case DO_USE_STDIO:
 324     return callbacks->write_stdout(callbacks, buf, sizeof_buf);
 325     break;
 326   case DONT_USE_STDIO:
 327     return callbacks->write(callbacks, 1, buf, sizeof_buf);
 328     break;
 329   default:
 330     error("sim_io_write_stdout: unaccounted switch\n");
 331     break;
 332   }
 333   return 0;
 334 }
 335
 336 int
 337 sim_io_write_stderr(const char *buf,
 338                     int sizeof_buf)
 339 {
 340   switch (CURRENT_STDIO) {
 341   case DO_USE_STDIO:
 342     /* NB: I think there should be an explicit write_stderr callback */
 343     return callbacks->write(callbacks, 3, buf, sizeof_buf);
 344     break;
 345   case DONT_USE_STDIO:
 346     return callbacks->write(callbacks, 3, buf, sizeof_buf);
 347     break;
 348   default:
 349     error("sim_io_write_stderr: unaccounted switch\n");
 350     break;
 351   }
 352   return 0;
 353 }
 354
 355
 356 void
 357 sim_io_printf_filtered(const char *fmt,
 358                        ...)
 359 {
 360   char message[1024];
 361   va_list ap;
 362   /* format the message */
 363   va_start(ap, fmt);
 364   vsprintf(message, fmt, ap);
 365   va_end(ap);
 366   /* sanity check */
 367   if (strlen(message) >= sizeof(message))
 368     error("sim_io_printf_filtered: buffer overflow\n");
 369   callbacks->printf_filtered(callbacks, "%s", message);
 370 }
 371
 372 void
 373 sim_io_flush_stdoutput(void)
 374 {
 375   switch (CURRENT_STDIO) {
 376   case DO_USE_STDIO:
 377     gdb_flush (gdb_stdout);
 378     break;
 379   case DONT_USE_STDIO:
 380     break;
 381   default:
 382     error("sim_io_read_stdin: unaccounted switch\n");
 383     break;
 384   }
 385 }
 386
 387 void
 388 sim_set_callbacks (host_callback *callback)
 389 {
 390   callbacks = callback;
 391   TRACE(trace_gdb, ("sim_set_callbacks called\n"));
 392 }
 393
 394 /****/
 395
 396 void *
 397 zalloc(long size)
 398 {
 399   void *memory = (void*)xmalloc(size);
 400   if (memory == NULL)
 401     error("xmalloc failed\n");
 402   memset(memory, 0, size);
 403   return memory;
 404 }
 405
 406 void zfree(void *data)
 407 {
 408   mfree(NULL, data);
 409 }