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 "callback.h"
  45 #include "remote-sim.h"
  46
  47
  48 /* Structures used by the simulator, for gdb just have static structures */
  49
  50 static psim *simulator;
  51 static device *root_device;
  52 static const char *register_names[] = REGISTER_NAMES;
  53
  54 void
  55 sim_open (char *args)
  56 {
  57   /* Note: The simulation is not created by sim_open() because
  58      complete information is not yet available */
  59   /* trace the call */
  60   TRACE(trace_gdb, ("sim_open(args=%s) called\n", args ? args : "(null)"));
  61
  62   if (root_device != NULL)
  63     sim_io_printf_filtered("Warning - re-open of simulator leaks memory\n");
  64   root_device = psim_tree();
  65   simulator = NULL;
  66
  67   if (args) {
  68     char **argv = buildargv(args);
  69     psim_options(root_device, argv);
  70     freeargv(argv);
  71   }
  72
  73   if (ppc_trace[trace_opts])
  74     print_options ();
  75 }
  76
  77
  78 void
  79 sim_close (int quitting)
  80 {
  81   TRACE(trace_gdb, ("sim_close(quitting=%d) called\n", quitting));
  82   if (ppc_trace[trace_print_info] && simulator != NULL)
  83     psim_print_info (simulator, ppc_trace[trace_print_info]);
  84 }
  85
  86
  87 int
  88 sim_load (char *prog, int from_tty)
  89 {
  90   char **argv;
  91   TRACE(trace_gdb, ("sim_load(prog=%s, from_tty=%d) called\n",
  92                     prog, from_tty));
  93   ASSERT(prog != NULL);
  94
  95   /* parse the arguments, assume that the file is argument 0 */
  96   argv = buildargv(prog);
  97   ASSERT(argv != NULL && argv[0] != NULL);
  98
  99   /* create the simulator */
 100   TRACE(trace_gdb, ("sim_load() - first time, create the simulator\n"));
 101   simulator = psim_create(argv[0], root_device);
 102
 103   /* bring in all the data section */
 104   psim_init(simulator);
 105
 106   /* release the arguments */
 107   freeargv(argv);
 108
 109   /* `I did it my way' */
 110   return 0;
 111 }
 112
 113
 114 void
 115 sim_kill (void)
 116 {
 117   TRACE(trace_gdb, ("sim_kill(void) called\n"));
 118   /* do nothing, nothing to do */
 119 }
 120
 121
 122 int
 123 sim_read (SIM_ADDR mem, unsigned char *buf, int length)
 124 {
 125   int result = psim_read_memory(simulator, MAX_NR_PROCESSORS,
 126                                 buf, mem, length);
 127   TRACE(trace_gdb, ("sim_read(mem=0x%lx, buf=0x%lx, length=%d) = %d\n",
 128                     (long)mem, (long)buf, length, result));
 129   return result;
 130 }
 131
 132
 133 int
 134 sim_write (SIM_ADDR mem, unsigned char *buf, int length)
 135 {
 136   int result = psim_write_memory(simulator, MAX_NR_PROCESSORS,
 137                                  buf, mem, length,
 138                                  1/*violate_ro*/);
 139   TRACE(trace_gdb, ("sim_write(mem=0x%lx, buf=0x%lx, length=%d) = %d\n",
 140                     (long)mem, (long)buf, length, result));
 141   return result;
 142 }
 143
 144
 145 void
 146 sim_fetch_register (int regno, unsigned char *buf)
 147 {
 148   if (simulator == NULL) {
 149     return;
 150   }
 151   TRACE(trace_gdb, ("sim_fetch_register(regno=%d(%s), buf=0x%lx)\n",
 152                     regno, register_names[regno], (long)buf));
 153   psim_read_register(simulator, MAX_NR_PROCESSORS,
 154                      buf, register_names[regno],
 155                      raw_transfer);
 156 }
 157
 158
 159 void
 160 sim_store_register (int regno, unsigned char *buf)
 161 {
 162   if (simulator == NULL)
 163     return;
 164   TRACE(trace_gdb, ("sim_store_register(regno=%d(%s), buf=0x%lx)\n",
 165                     regno, register_names[regno], (long)buf));
 166   psim_write_register(simulator, MAX_NR_PROCESSORS,
 167                       buf, register_names[regno],
 168                       raw_transfer);
 169 }
 170
 171
 172 void
 173 sim_info (int verbose)
 174 {
 175   TRACE(trace_gdb, ("sim_info(verbose=%d) called\n", verbose));
 176   psim_print_info (simulator, verbose);
 177 }
 178
 179
 180 void
 181 sim_create_inferior (SIM_ADDR start_address, char **argv, char **envp)
 182 {
 183   unsigned_word entry_point = start_address;
 184
 185   TRACE(trace_gdb, ("sim_create_inferior(start_address=0x%x, ...)\n",
 186                     start_address));
 187
 188   psim_init(simulator);
 189   psim_stack(simulator, argv, envp);
 190
 191   psim_write_register(simulator, -1 /* all start at same PC */,
 192                       &entry_point, "pc", cooked_transfer);
 193 }
 194
 195
 196 static volatile int sim_should_run;
 197
 198 void
 199 sim_stop_reason (enum sim_stop *reason, int *sigrc)
 200 {
 201   psim_status status = psim_get_status(simulator);
 202
 203   switch (CURRENT_ENVIRONMENT) {
 204
 205   case USER_ENVIRONMENT:
 206   case VIRTUAL_ENVIRONMENT:
 207     switch (status.reason) {
 208     case was_continuing:
 209       *reason = sim_stopped;
 210       *sigrc = SIGTRAP;
 211       if (sim_should_run) {
 212         error("sim_stop_reason() unknown reason for halt\n");
 213       }
 214       break;
 215     case was_trap:
 216       *reason = sim_stopped;
 217       *sigrc = SIGTRAP;
 218       break;
 219     case was_exited:
 220       *reason = sim_exited;
 221       *sigrc = 0;
 222       break;
 223     case was_signalled:
 224       *reason = sim_signalled;
 225       *sigrc = status.signal;
 226       break;
 227     }
 228     break;
 229
 230   case OPERATING_ENVIRONMENT:
 231     *reason = sim_stopped;
 232     *sigrc = SIGTRAP;
 233     break;
 234
 235   default:
 236     error("sim_stop_reason() - unknown environment\n");
 237
 238   }
 239
 240   TRACE(trace_gdb, ("sim_stop_reason(reason=0x%lx(%ld), sigrc=0x%lx(%ld))\n",
 241                     (long)reason, (long)*reason, (long)sigrc, (long)*sigrc));
 242 }
 243
 244
 245
 246 /* Run (or resume) the program.  */
 247 static void
 248 sim_ctrl_c()
 249 {
 250   sim_should_run = 0;
 251 }
 252
 253 void
 254 sim_resume (int step, int siggnal)
 255 {
 256   TRACE(trace_gdb, ("sim_resume(step=%d, siggnal=%d)\n",
 257                     step, siggnal));
 258
 259   if (step)
 260     {
 261       psim_step(simulator);
 262       /* sim_stop_reason has a sanity check for stopping while
 263          was_continuing.  We don't want that here so reset sim_should_run.  */
 264       sim_should_run = 0;
 265     }
 266   else
 267     {
 268       void (*prev) ();
 269
 270       prev = signal(SIGINT, sim_ctrl_c);
 271       sim_should_run = 1;
 272       psim_run_until_stop(simulator, &sim_should_run);
 273       signal(SIGINT, prev);
 274     }
 275 }
 276
 277 void
 278 sim_do_command (char *cmd)
 279 {
 280   TRACE(trace_gdb, ("sim_do_commands(cmd=%s) called\n",
 281                     cmd ? cmd : "(null)"));
 282   if (cmd != NULL) {
 283     char **argv = buildargv(cmd);
 284     psim_command(root_device, argv);
 285     freeargv(argv);
 286   }
 287 }
 288
 289
 290 /* Map simulator IO operations onto the corresponding GDB I/O
 291    functions.
 292
 293    NB: Only a limited subset of operations are mapped across.  More
 294    advanced operations (such as dup or write) must either be mapped to
 295    one of the below calls or handled internally */
 296
 297 static host_callback *callbacks;
 298
 299 int
 300 sim_io_read_stdin(char *buf,
 301                   int sizeof_buf)
 302 {
 303   switch (CURRENT_STDIO) {
 304   case DO_USE_STDIO:
 305     return callbacks->read_stdin(callbacks, buf, sizeof_buf);
 306     break;
 307   case DONT_USE_STDIO:
 308     return callbacks->read(callbacks, 0, buf, sizeof_buf);
 309     break;
 310   default:
 311     error("sim_io_read_stdin: unaccounted switch\n");
 312     break;
 313   }
 314   return 0;
 315 }
 316
 317 int
 318 sim_io_write_stdout(const char *buf,
 319                     int sizeof_buf)
 320 {
 321   switch (CURRENT_STDIO) {
 322   case DO_USE_STDIO:
 323     return callbacks->write_stdout(callbacks, buf, sizeof_buf);
 324     break;
 325   case DONT_USE_STDIO:
 326     return callbacks->write(callbacks, 1, buf, sizeof_buf);
 327     break;
 328   default:
 329     error("sim_io_write_stdout: unaccounted switch\n");
 330     break;
 331   }
 332   return 0;
 333 }
 334
 335 int
 336 sim_io_write_stderr(const char *buf,
 337                     int sizeof_buf)
 338 {
 339   switch (CURRENT_STDIO) {
 340   case DO_USE_STDIO:
 341     /* NB: I think there should be an explicit write_stderr callback */
 342     return callbacks->write(callbacks, 3, buf, sizeof_buf);
 343     break;
 344   case DONT_USE_STDIO:
 345     return callbacks->write(callbacks, 3, buf, sizeof_buf);
 346     break;
 347   default:
 348     error("sim_io_write_stderr: unaccounted switch\n");
 349     break;
 350   }
 351   return 0;
 352 }
 353
 354
 355 void
 356 sim_io_printf_filtered(const char *fmt,
 357                        ...)
 358 {
 359   char message[1024];
 360   va_list ap;
 361   /* format the message */
 362   va_start(ap, fmt);
 363   vsprintf(message, fmt, ap);
 364   va_end(ap);
 365   /* sanity check */
 366   if (strlen(message) >= sizeof(message))
 367     error("sim_io_printf_filtered: buffer overflow\n");
 368   callbacks->printf_filtered(callbacks, "%s", message);
 369 }
 370
 371 void
 372 sim_io_flush_stdoutput(void)
 373 {
 374   switch (CURRENT_STDIO) {
 375   case DO_USE_STDIO:
 376     gdb_flush (gdb_stdout);
 377     break;
 378   case DONT_USE_STDIO:
 379     break;
 380   default:
 381     error("sim_io_read_stdin: unaccounted switch\n");
 382     break;
 383   }
 384 }
 385
 386 void
 387 sim_set_callbacks (host_callback *callback)
 388 {
 389   callbacks = callback;
 390   TRACE(trace_gdb, ("sim_set_callbacks called\n"));
 391 }
 392
 393 /****/
 394
 395 void *
 396 zalloc(long size)
 397 {
 398   void *memory = (void*)xmalloc(size);
 399   if (memory == NULL)
 400     error("xmalloc failed\n");
 401   memset(memory, 0, size);
 402   return memory;
 403 }
 404
 405 void zfree(void *data)
 406 {
 407   mfree(NULL, data);
 408 }