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 static host_callback *callbacks;
  55
  56 /* For communication between sim_load and sim_create_inferior.
  57    This can be made to go away, please do.  */
  58 static unsigned_word entry_point;
  59
  60 SIM_DESC
  61 sim_open (SIM_OPEN_KIND kind,
  62           host_callback *callback,
  63           struct _bfd *abfd,
  64           char **argv)
  65 {
  66   callbacks = callback;
  67
  68   /* Note: The simulation is not created by sim_open() because
  69      complete information is not yet available */
  70   /* trace the call */
  71   TRACE(trace_gdb, ("sim_open called\n"));
  72
  73   if (root_device != NULL)
  74     sim_io_printf_filtered("Warning - re-open of simulator leaks memory\n");
  75   root_device = psim_tree();
  76   simulator = NULL;
  77
  78   psim_options(root_device, argv + 1);
  79
  80   if (ppc_trace[trace_opts])
  81     print_options ();
  82
  83   /* fudge our descriptor for now */
  84   return (SIM_DESC) 1;
  85 }
  86
  87
  88 void
  89 sim_close (SIM_DESC sd, int quitting)
  90 {
  91   TRACE(trace_gdb, ("sim_close(quitting=%d) called\n", quitting));
  92   if (ppc_trace[trace_print_info] && simulator != NULL)
  93     psim_print_info (simulator, ppc_trace[trace_print_info]);
  94 }
  95
  96
  97 SIM_RC
  98 sim_load (SIM_DESC sd, char *prog, bfd *abfd, int from_tty)
  99 {
 100   char **argv;
 101   TRACE(trace_gdb, ("sim_load(prog=%s, from_tty=%d) called\n",
 102                     prog, from_tty));
 103   ASSERT(prog != NULL);
 104
 105   /* parse the arguments, assume that the file is argument 0 */
 106   argv = buildargv(prog);
 107   ASSERT(argv != NULL && argv[0] != NULL);
 108
 109   /* create the simulator */
 110   TRACE(trace_gdb, ("sim_load() - first time, create the simulator\n"));
 111   simulator = psim_create(argv[0], root_device);
 112
 113   /* bring in all the data section */
 114   psim_init(simulator);
 115
 116   /* release the arguments */
 117   freeargv(argv);
 118
 119   /* get the start address */
 120   if (abfd != NULL)
 121     entry_point = bfd_get_start_address (abfd);
 122   else
 123     {
 124       abfd = bfd_openr (argv[0], 0);
 125       if (abfd == NULL)
 126         error ("psim: can't open \"%s\": %s\n",
 127                argv[0], bfd_errmsg (bfd_get_error ()));
 128       if (!bfd_check_format (abfd, bfd_object))
 129         {
 130           const char *errmsg = bfd_errmsg (bfd_get_error ());
 131           bfd_close (abfd);
 132           error ("psim: \"%s\" is not an object file: %s\n",
 133                  argv[0], errmsg);
 134         }
 135       entry_point = bfd_get_start_address (abfd);
 136       bfd_close (abfd);
 137     }
 138
 139   return SIM_RC_OK;
 140 }
 141
 142
 143 int
 144 sim_read (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)
 145 {
 146   int result = psim_read_memory(simulator, MAX_NR_PROCESSORS,
 147                                 buf, mem, length);
 148   TRACE(trace_gdb, ("sim_read(mem=0x%lx, buf=0x%lx, length=%d) = %d\n",
 149                     (long)mem, (long)buf, length, result));
 150   return result;
 151 }
 152
 153
 154 int
 155 sim_write (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)
 156 {
 157   int result = psim_write_memory(simulator, MAX_NR_PROCESSORS,
 158                                  buf, mem, length,
 159                                  1/*violate_ro*/);
 160   TRACE(trace_gdb, ("sim_write(mem=0x%lx, buf=0x%lx, length=%d) = %d\n",
 161                     (long)mem, (long)buf, length, result));
 162   return result;
 163 }
 164
 165
 166 void
 167 sim_fetch_register (SIM_DESC sd, int regno, unsigned char *buf)
 168 {
 169   if (simulator == NULL) {
 170     return;
 171   }
 172   TRACE(trace_gdb, ("sim_fetch_register(regno=%d(%s), buf=0x%lx)\n",
 173                     regno, register_names[regno], (long)buf));
 174   psim_read_register(simulator, MAX_NR_PROCESSORS,
 175                      buf, register_names[regno],
 176                      raw_transfer);
 177 }
 178
 179
 180 void
 181 sim_store_register (SIM_DESC sd, int regno, unsigned char *buf)
 182 {
 183   if (simulator == NULL)
 184     return;
 185   TRACE(trace_gdb, ("sim_store_register(regno=%d(%s), buf=0x%lx)\n",
 186                     regno, register_names[regno], (long)buf));
 187   psim_write_register(simulator, MAX_NR_PROCESSORS,
 188                       buf, register_names[regno],
 189                       raw_transfer);
 190 }
 191
 192
 193 void
 194 sim_info (SIM_DESC sd, int verbose)
 195 {
 196   TRACE(trace_gdb, ("sim_info(verbose=%d) called\n", verbose));
 197   psim_print_info (simulator, verbose);
 198 }
 199
 200
 201 SIM_RC
 202 sim_create_inferior (SIM_DESC sd, char **argv, char **envp)
 203 {
 204   TRACE(trace_gdb, ("sim_create_inferior(start_address=0x%x, ...)\n",
 205                     entry_point));
 206
 207   psim_init(simulator);
 208   psim_stack(simulator, argv, envp);
 209
 210   psim_write_register(simulator, -1 /* all start at same PC */,
 211                       &entry_point, "pc", cooked_transfer);
 212   return SIM_RC_OK;
 213 }
 214
 215
 216 void
 217 sim_stop_reason (SIM_DESC sd, enum sim_stop *reason, int *sigrc)
 218 {
 219   psim_status status = psim_get_status(simulator);
 220
 221   switch (status.reason) {
 222   case was_continuing:
 223     *reason = sim_stopped;
 224     if (status.signal == 0)
 225       *sigrc = SIGTRAP;
 226     else
 227       *sigrc = status.signal;
 228     break;
 229   case was_trap:
 230     *reason = sim_stopped;
 231     *sigrc = SIGTRAP;
 232     break;
 233   case was_exited:
 234     *reason = sim_exited;
 235     *sigrc = status.signal;
 236     break;
 237   case was_signalled:
 238     *reason = sim_signalled;
 239     *sigrc = status.signal;
 240     break;
 241   }
 242
 243   TRACE(trace_gdb, ("sim_stop_reason(reason=0x%lx(%ld), sigrc=0x%lx(%ld))\n",
 244                     (long)reason, (long)*reason, (long)sigrc, (long)*sigrc));
 245 }
 246
 247
 248
 249 /* Run (or resume) the program.  */
 250
 251 int
 252 sim_stop (SIM_DESC sd)
 253 {
 254   psim_stop (simulator);
 255   return 1;
 256 }
 257
 258 void
 259 sim_resume (SIM_DESC sd, int step, int siggnal)
 260 {
 261   TRACE(trace_gdb, ("sim_resume(step=%d, siggnal=%d)\n",
 262                     step, siggnal));
 263
 264   if (step)
 265     {
 266       psim_step (simulator);
 267     }
 268   else
 269     {
 270       psim_run (simulator);
 271     }
 272 }
 273
 274 void
 275 sim_do_command (SIM_DESC sd, char *cmd)
 276 {
 277   TRACE(trace_gdb, ("sim_do_commands(cmd=%s) called\n",
 278                     cmd ? cmd : "(null)"));
 279   if (cmd != NULL) {
 280     char **argv = buildargv(cmd);
 281     psim_command(root_device, argv);
 282     freeargv(argv);
 283   }
 284 }
 285
 286
 287 /* Map simulator IO operations onto the corresponding GDB I/O
 288    functions.
 289
 290    NB: Only a limited subset of operations are mapped across.  More
 291    advanced operations (such as dup or write) must either be mapped to
 292    one of the below calls or handled internally */
 293
 294 int
 295 sim_io_read_stdin(char *buf,
 296                   int sizeof_buf)
 297 {
 298   switch (CURRENT_STDIO) {
 299   case DO_USE_STDIO:
 300     return callbacks->read_stdin(callbacks, buf, sizeof_buf);
 301     break;
 302   case DONT_USE_STDIO:
 303     return callbacks->read(callbacks, 0, buf, sizeof_buf);
 304     break;
 305   default:
 306     error("sim_io_read_stdin: unaccounted switch\n");
 307     break;
 308   }
 309   return 0;
 310 }
 311
 312 int
 313 sim_io_write_stdout(const char *buf,
 314                     int sizeof_buf)
 315 {
 316   switch (CURRENT_STDIO) {
 317   case DO_USE_STDIO:
 318     return callbacks->write_stdout(callbacks, buf, sizeof_buf);
 319     break;
 320   case DONT_USE_STDIO:
 321     return callbacks->write(callbacks, 1, buf, sizeof_buf);
 322     break;
 323   default:
 324     error("sim_io_write_stdout: unaccounted switch\n");
 325     break;
 326   }
 327   return 0;
 328 }
 329
 330 int
 331 sim_io_write_stderr(const char *buf,
 332                     int sizeof_buf)
 333 {
 334   switch (CURRENT_STDIO) {
 335   case DO_USE_STDIO:
 336     /* NB: I think there should be an explicit write_stderr callback */
 337     return callbacks->write(callbacks, 3, buf, sizeof_buf);
 338     break;
 339   case DONT_USE_STDIO:
 340     return callbacks->write(callbacks, 3, buf, sizeof_buf);
 341     break;
 342   default:
 343     error("sim_io_write_stderr: unaccounted switch\n");
 344     break;
 345   }
 346   return 0;
 347 }
 348
 349
 350 void
 351 sim_io_printf_filtered(const char *fmt,
 352                        ...)
 353 {
 354   char message[1024];
 355   va_list ap;
 356   /* format the message */
 357   va_start(ap, fmt);
 358   vsprintf(message, fmt, ap);
 359   va_end(ap);
 360   /* sanity check */
 361   if (strlen(message) >= sizeof(message))
 362     error("sim_io_printf_filtered: buffer overflow\n");
 363   callbacks->printf_filtered(callbacks, "%s", message);
 364 }
 365
 366 void
 367 sim_io_flush_stdoutput(void)
 368 {
 369   switch (CURRENT_STDIO) {
 370   case DO_USE_STDIO:
 371     gdb_flush (gdb_stdout);
 372     break;
 373   case DONT_USE_STDIO:
 374     break;
 375   default:
 376     error("sim_io_read_stdin: unaccounted switch\n");
 377     break;
 378   }
 379 }
 380
 381 /****/
 382
 383 void *
 384 zalloc(long size)
 385 {
 386   void *memory = (void*)xmalloc(size);
 387   if (memory == NULL)
 388     error("xmalloc failed\n");
 389   memset(memory, 0, size);
 390   return memory;
 391 }
 392
 393 void zfree(void *data)
 394 {
 395   mfree(NULL, data);
 396 }