gdb/remote-sim.c

   1 /* Generic remote debugging interface for simulators.
   2
   3    Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
   4    2002 Free Software Foundation, Inc.
   5
   6    Contributed by Cygnus Support.
   7    Steve Chamberlain (sac@cygnus.com).
   8
   9    This file is part of GDB.
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 59 Temple Place - Suite 330,
  24    Boston, MA 02111-1307, USA.  */
  25
  26 #include "defs.h"
  27 #include "inferior.h"
  28 #include "value.h"
  29 #include "gdb_string.h"
  30 #include <ctype.h>
  31 #include <fcntl.h>
  32 #include <signal.h>
  33 #include <setjmp.h>
  34 #include <errno.h>
  35 #include "terminal.h"
  36 #include "target.h"
  37 #include "gdbcore.h"
  38 #include "callback.h"
  39 #include "remote-sim.h"
  40 #include "remote-utils.h"
  41 #include "command.h"
  42 #include "regcache.h"
  43
  44 /* Prototypes */
  45
  46 extern void _initialize_remote_sim (void);
  47
  48 extern int (*ui_loop_hook) (int signo);
  49
  50 static void dump_mem (char *buf, int len);
  51
  52 static void init_callbacks (void);
  53
  54 static void end_callbacks (void);
  55
  56 static int gdb_os_write_stdout (host_callback *, const char *, int);
  57
  58 static void gdb_os_flush_stdout (host_callback *);
  59
  60 static int gdb_os_write_stderr (host_callback *, const char *, int);
  61
  62 static void gdb_os_flush_stderr (host_callback *);
  63
  64 static int gdb_os_poll_quit (host_callback *);
  65
  66 /* printf_filtered is depreciated */
  67 static void gdb_os_printf_filtered (host_callback *, const char *, ...);
  68
  69 static void gdb_os_vprintf_filtered (host_callback *, const char *, va_list);
  70
  71 static void gdb_os_evprintf_filtered (host_callback *, const char *, va_list);
  72
  73 static void gdb_os_error (host_callback *, const char *, ...);
  74
  75 static void gdbsim_fetch_register (int regno);
  76
  77 static void gdbsim_store_register (int regno);
  78
  79 static void gdbsim_kill (void);
  80
  81 static void gdbsim_load (char *prog, int fromtty);
  82
  83 static void gdbsim_create_inferior (char *exec_file, char *args, char **env);
  84
  85 static void gdbsim_open (char *args, int from_tty);
  86
  87 static void gdbsim_close (int quitting);
  88
  89 static void gdbsim_detach (char *args, int from_tty);
  90
  91 static void gdbsim_resume (ptid_t ptid, int step, enum target_signal siggnal);
  92
  93 static ptid_t gdbsim_wait (ptid_t ptid, struct target_waitstatus *status);
  94
  95 static void gdbsim_prepare_to_store (void);
  96
  97 static int gdbsim_xfer_inferior_memory (CORE_ADDR memaddr, char *myaddr,
  98                                         int len, int write,
  99                                         struct mem_attrib *attrib,
 100                                         struct target_ops *target);
 101
 102 static void gdbsim_files_info (struct target_ops *target);
 103
 104 static void gdbsim_mourn_inferior (void);
 105
 106 static void gdbsim_stop (void);
 107
 108 void simulator_command (char *args, int from_tty);
 109
 110 /* Naming convention:
 111
 112    sim_* are the interface to the simulator (see remote-sim.h).
 113    gdbsim_* are stuff which is internal to gdb.  */
 114
 115 /* Forward data declarations */
 116 extern struct target_ops gdbsim_ops;
 117
 118 static int program_loaded = 0;
 119
 120 /* We must keep track of whether the simulator has been opened or not because
 121    GDB can call a target's close routine twice, but sim_close doesn't allow
 122    this.  We also need to record the result of sim_open so we can pass it
 123    back to the other sim_foo routines.  */
 124 static SIM_DESC gdbsim_desc = 0;
 125
 126 static void
 127 dump_mem (char *buf, int len)
 128 {
 129   if (len <= 8)
 130     {
 131       if (len == 8 || len == 4)
 132         {
 133           long l[2];
 134           memcpy (l, buf, len);
 135           printf_filtered ("\t0x%lx", l[0]);
 136           if (len == 8)
 137             printf_filtered (" 0x%lx", l[1]);
 138           printf_filtered ("\n");
 139         }
 140       else
 141         {
 142           int i;
 143           printf_filtered ("\t");
 144           for (i = 0; i < len; i++)
 145             printf_filtered ("0x%x ", buf[i]);
 146           printf_filtered ("\n");
 147         }
 148     }
 149 }
 150
 151 static host_callback gdb_callback;
 152 static int callbacks_initialized = 0;
 153
 154 /* Initialize gdb_callback.  */
 155
 156 static void
 157 init_callbacks (void)
 158 {
 159   if (!callbacks_initialized)
 160     {
 161       gdb_callback = default_callback;
 162       gdb_callback.init (&gdb_callback);
 163       gdb_callback.write_stdout = gdb_os_write_stdout;
 164       gdb_callback.flush_stdout = gdb_os_flush_stdout;
 165       gdb_callback.write_stderr = gdb_os_write_stderr;
 166       gdb_callback.flush_stderr = gdb_os_flush_stderr;
 167       gdb_callback.printf_filtered = gdb_os_printf_filtered;
 168       gdb_callback.vprintf_filtered = gdb_os_vprintf_filtered;
 169       gdb_callback.evprintf_filtered = gdb_os_evprintf_filtered;
 170       gdb_callback.error = gdb_os_error;
 171       gdb_callback.poll_quit = gdb_os_poll_quit;
 172       gdb_callback.magic = HOST_CALLBACK_MAGIC;
 173       callbacks_initialized = 1;
 174     }
 175 }
 176
 177 /* Release callbacks (free resources used by them).  */
 178
 179 static void
 180 end_callbacks (void)
 181 {
 182   if (callbacks_initialized)
 183     {
 184       gdb_callback.shutdown (&gdb_callback);
 185       callbacks_initialized = 0;
 186     }
 187 }
 188
 189 /* GDB version of os_write_stdout callback.  */
 190
 191 static int
 192 gdb_os_write_stdout (host_callback *p, const char *buf, int len)
 193 {
 194   int i;
 195   char b[2];
 196
 197   ui_file_write (gdb_stdtarg, buf, len);
 198   return len;
 199 }
 200
 201 /* GDB version of os_flush_stdout callback.  */
 202
 203 static void
 204 gdb_os_flush_stdout (host_callback *p)
 205 {
 206   gdb_flush (gdb_stdtarg);
 207 }
 208
 209 /* GDB version of os_write_stderr callback.  */
 210
 211 static int
 212 gdb_os_write_stderr (host_callback *p, const char *buf, int len)
 213 {
 214   int i;
 215   char b[2];
 216
 217   for (i = 0; i < len; i++)
 218     {
 219       b[0] = buf[i];
 220       b[1] = 0;
 221       fputs_unfiltered (b, gdb_stdtarg);
 222     }
 223   return len;
 224 }
 225
 226 /* GDB version of os_flush_stderr callback.  */
 227
 228 static void
 229 gdb_os_flush_stderr (host_callback *p)
 230 {
 231   gdb_flush (gdb_stderr);
 232 }
 233
 234 /* GDB version of printf_filtered callback.  */
 235
 236 static void
 237 gdb_os_printf_filtered (host_callback * p, const char *format,...)
 238 {
 239   va_list args;
 240   va_start (args, format);
 241
 242   vfprintf_filtered (gdb_stdout, format, args);
 243
 244   va_end (args);
 245 }
 246
 247 /* GDB version of error vprintf_filtered.  */
 248
 249 static void
 250 gdb_os_vprintf_filtered (host_callback * p, const char *format, va_list ap)
 251 {
 252   vfprintf_filtered (gdb_stdout, format, ap);
 253 }
 254
 255 /* GDB version of error evprintf_filtered.  */
 256
 257 static void
 258 gdb_os_evprintf_filtered (host_callback * p, const char *format, va_list ap)
 259 {
 260   vfprintf_filtered (gdb_stderr, format, ap);
 261 }
 262
 263 /* GDB version of error callback.  */
 264
 265 static void
 266 gdb_os_error (host_callback * p, const char *format,...)
 267 {
 268   if (error_hook)
 269     (*error_hook) ();
 270   else
 271     {
 272       va_list args;
 273       va_start (args, format);
 274       verror (format, args);
 275       va_end (args);
 276     }
 277 }
 278
 279 static void
 280 gdbsim_fetch_register (int regno)
 281 {
 282   static int warn_user = 1;
 283   if (regno == -1)
 284     {
 285       for (regno = 0; regno < NUM_REGS; regno++)
 286         gdbsim_fetch_register (regno);
 287     }
 288   else if (REGISTER_NAME (regno) != NULL
 289            && *REGISTER_NAME (regno) != '\0')
 290     {
 291       char buf[MAX_REGISTER_RAW_SIZE];
 292       int nr_bytes;
 293       if (REGISTER_SIM_REGNO (regno) >= 0)
 294         nr_bytes = sim_fetch_register (gdbsim_desc,
 295                                        REGISTER_SIM_REGNO (regno),
 296                                        buf, REGISTER_RAW_SIZE (regno));
 297       else
 298         nr_bytes = 0;
 299       if (nr_bytes == 0)
 300         /* register not applicable, supply zero's */
 301         memset (buf, 0, MAX_REGISTER_RAW_SIZE);
 302       else if (nr_bytes > 0 && nr_bytes != REGISTER_RAW_SIZE (regno)
 303                && warn_user)
 304         {
 305           fprintf_unfiltered (gdb_stderr,
 306                               "Size of register %s (%d/%d) incorrect (%d instead of %d))",
 307                               REGISTER_NAME (regno),
 308                               regno, REGISTER_SIM_REGNO (regno),
 309                               nr_bytes, REGISTER_RAW_SIZE (regno));
 310           warn_user = 0;
 311         }
 312       supply_register (regno, buf);
 313       if (sr_get_debug ())
 314         {
 315           printf_filtered ("gdbsim_fetch_register: %d", regno);
 316           /* FIXME: We could print something more intelligible.  */
 317           dump_mem (buf, REGISTER_RAW_SIZE (regno));
 318         }
 319     }
 320 }
 321
 322
 323 static void
 324 gdbsim_store_register (int regno)
 325 {
 326   if (regno == -1)
 327     {
 328       for (regno = 0; regno < NUM_REGS; regno++)
 329         gdbsim_store_register (regno);
 330     }
 331   else if (REGISTER_NAME (regno) != NULL
 332            && *REGISTER_NAME (regno) != '\0'
 333            && REGISTER_SIM_REGNO (regno) >= 0)
 334     {
 335       char tmp[MAX_REGISTER_RAW_SIZE];
 336       int nr_bytes;
 337       read_register_gen (regno, tmp);
 338       nr_bytes = sim_store_register (gdbsim_desc,
 339                                      REGISTER_SIM_REGNO (regno),
 340                                      tmp, REGISTER_RAW_SIZE (regno));
 341       if (nr_bytes > 0 && nr_bytes != REGISTER_RAW_SIZE (regno))
 342         internal_error (__FILE__, __LINE__,
 343                         "Register size different to expected");
 344       if (sr_get_debug ())
 345         {
 346           printf_filtered ("gdbsim_store_register: %d", regno);
 347           /* FIXME: We could print something more intelligible.  */
 348           dump_mem (tmp, REGISTER_RAW_SIZE (regno));
 349         }
 350     }
 351 }
 352
 353 /* Kill the running program.  This may involve closing any open files
 354    and releasing other resources acquired by the simulated program.  */
 355
 356 static void
 357 gdbsim_kill (void)
 358 {
 359   if (sr_get_debug ())
 360     printf_filtered ("gdbsim_kill\n");
 361
 362   /* There is no need to `kill' running simulator - the simulator is
 363      not running */
 364   inferior_ptid = null_ptid;
 365 }
 366
 367 /* Load an executable file into the target process.  This is expected to
 368    not only bring new code into the target process, but also to update
 369    GDB's symbol tables to match.  */
 370
 371 static void
 372 gdbsim_load (char *prog, int fromtty)
 373 {
 374   if (sr_get_debug ())
 375     printf_filtered ("gdbsim_load: prog \"%s\"\n", prog);
 376
 377   inferior_ptid = null_ptid;
 378
 379   /* FIXME: We will print two messages on error.
 380      Need error to either not print anything if passed NULL or need
 381      another routine that doesn't take any arguments.  */
 382   if (sim_load (gdbsim_desc, prog, NULL, fromtty) == SIM_RC_FAIL)
 383     error ("unable to load program");
 384
 385   /* FIXME: If a load command should reset the targets registers then
 386      a call to sim_create_inferior() should go here. */
 387
 388   program_loaded = 1;
 389 }
 390
 391
 392 /* Start an inferior process and set inferior_ptid to its pid.
 393    EXEC_FILE is the file to run.
 394    ARGS is a string containing the arguments to the program.
 395    ENV is the environment vector to pass.  Errors reported with error().
 396    On VxWorks and various standalone systems, we ignore exec_file.  */
 397 /* This is called not only when we first attach, but also when the
 398    user types "run" after having attached.  */
 399
 400 static void
 401 gdbsim_create_inferior (char *exec_file, char *args, char **env)
 402 {
 403   int len;
 404   char *arg_buf, **argv;
 405
 406   if (exec_file == 0 || exec_bfd == 0)
 407     warning ("No executable file specified.");
 408   if (!program_loaded)
 409     warning ("No program loaded.");
 410
 411   if (sr_get_debug ())
 412     printf_filtered ("gdbsim_create_inferior: exec_file \"%s\", args \"%s\"\n",
 413                      (exec_file ? exec_file : "(NULL)"),
 414                      args);
 415
 416   gdbsim_kill ();
 417   remove_breakpoints ();
 418   init_wait_for_inferior ();
 419
 420   if (exec_file != NULL)
 421     {
 422       len = strlen (exec_file) + 1 + strlen (args) + 1 + /*slop */ 10;
 423       arg_buf = (char *) alloca (len);
 424       arg_buf[0] = '\0';
 425       strcat (arg_buf, exec_file);
 426       strcat (arg_buf, " ");
 427       strcat (arg_buf, args);
 428       argv = buildargv (arg_buf);
 429       make_cleanup_freeargv (argv);
 430     }
 431   else
 432     argv = NULL;
 433   sim_create_inferior (gdbsim_desc, exec_bfd, argv, env);
 434
 435   inferior_ptid = pid_to_ptid (42);
 436   insert_breakpoints ();        /* Needed to get correct instruction in cache */
 437
 438   clear_proceed_status ();
 439
 440   /* NB: Entry point already set by sim_create_inferior. */
 441   proceed ((CORE_ADDR) -1, TARGET_SIGNAL_DEFAULT, 0);
 442 }
 443
 444 /* The open routine takes the rest of the parameters from the command,
 445    and (if successful) pushes a new target onto the stack.
 446    Targets should supply this routine, if only to provide an error message.  */
 447 /* Called when selecting the simulator. EG: (gdb) target sim name.  */
 448
 449 static void
 450 gdbsim_open (char *args, int from_tty)
 451 {
 452   int len;
 453   char *arg_buf;
 454   char **argv;
 455
 456   if (sr_get_debug ())
 457     printf_filtered ("gdbsim_open: args \"%s\"\n", args ? args : "(null)");
 458
 459   /* Remove current simulator if one exists.  Only do this if the simulator
 460      has been opened because sim_close requires it.
 461      This is important because the call to push_target below will cause
 462      sim_close to be called if the simulator is already open, but push_target
 463      is called after sim_open!  We can't move the call to push_target before
 464      the call to sim_open because sim_open may invoke `error'.  */
 465   if (gdbsim_desc != NULL)
 466     unpush_target (&gdbsim_ops);
 467
 468   len = (7 + 1                  /* gdbsim */
 469          + strlen (" -E little")
 470          + strlen (" --architecture=xxxxxxxxxx")
 471          + (args ? strlen (args) : 0)
 472          + 50) /* slack */ ;
 473   arg_buf = (char *) alloca (len);
 474   strcpy (arg_buf, "gdbsim");   /* 7 */
 475   /* Specify the byte order for the target when it is both selectable
 476      and explicitly specified by the user (not auto detected). */
 477   if (!TARGET_BYTE_ORDER_AUTO)
 478     {
 479       switch (TARGET_BYTE_ORDER)
 480         {
 481         case BFD_ENDIAN_BIG:
 482           strcat (arg_buf, " -E big");
 483           break;
 484         case BFD_ENDIAN_LITTLE:
 485           strcat (arg_buf, " -E little");
 486           break;
 487         default:
 488           internal_error (__FILE__, __LINE__,
 489                           "Value of TARGET_BYTE_ORDER unknown");
 490         }
 491     }
 492   /* Specify the architecture of the target when it has been
 493      explicitly specified */
 494   if (!TARGET_ARCHITECTURE_AUTO)
 495     {
 496       strcat (arg_buf, " --architecture=");
 497       strcat (arg_buf, TARGET_ARCHITECTURE->printable_name);
 498     }
 499   /* finally, any explicit args */
 500   if (args)
 501     {
 502       strcat (arg_buf, " ");    /* 1 */
 503       strcat (arg_buf, args);
 504     }
 505   argv = buildargv (arg_buf);
 506   if (argv == NULL)
 507     error ("Insufficient memory available to allocate simulator arg list.");
 508   make_cleanup_freeargv (argv);
 509
 510   init_callbacks ();
 511   gdbsim_desc = sim_open (SIM_OPEN_DEBUG, &gdb_callback, exec_bfd, argv);
 512
 513   if (gdbsim_desc == 0)
 514     error ("unable to create simulator instance");
 515
 516   push_target (&gdbsim_ops);
 517   target_fetch_registers (-1);
 518   printf_filtered ("Connected to the simulator.\n");
 519 }
 520
 521 /* Does whatever cleanup is required for a target that we are no longer
 522    going to be calling.  Argument says whether we are quitting gdb and
 523    should not get hung in case of errors, or whether we want a clean
 524    termination even if it takes a while.  This routine is automatically
 525    always called just before a routine is popped off the target stack.
 526    Closing file descriptors and freeing memory are typical things it should
 527    do.  */
 528 /* Close out all files and local state before this target loses control. */
 529
 530 static void
 531 gdbsim_close (int quitting)
 532 {
 533   if (sr_get_debug ())
 534     printf_filtered ("gdbsim_close: quitting %d\n", quitting);
 535
 536   program_loaded = 0;
 537
 538   if (gdbsim_desc != NULL)
 539     {
 540       sim_close (gdbsim_desc, quitting);
 541       gdbsim_desc = NULL;
 542     }
 543
 544   end_callbacks ();
 545   generic_mourn_inferior ();
 546 }
 547
 548 /* Takes a program previously attached to and detaches it.
 549    The program may resume execution (some targets do, some don't) and will
 550    no longer stop on signals, etc.  We better not have left any breakpoints
 551    in the program or it'll die when it hits one.  ARGS is arguments
 552    typed by the user (e.g. a signal to send the process).  FROM_TTY
 553    says whether to be verbose or not.  */
 554 /* Terminate the open connection to the remote debugger.
 555    Use this when you want to detach and do something else with your gdb.  */
 556
 557 static void
 558 gdbsim_detach (char *args, int from_tty)
 559 {
 560   if (sr_get_debug ())
 561     printf_filtered ("gdbsim_detach: args \"%s\"\n", args);
 562
 563   pop_target ();                /* calls gdbsim_close to do the real work */
 564   if (from_tty)
 565     printf_filtered ("Ending simulator %s debugging\n", target_shortname);
 566 }
 567
 568 /* Resume execution of the target process.  STEP says whether to single-step
 569    or to run free; SIGGNAL is the signal value (e.g. SIGINT) to be given
 570    to the target, or zero for no signal.  */
 571
 572 static enum target_signal resume_siggnal;
 573 static int resume_step;
 574
 575 static void
 576 gdbsim_resume (ptid_t ptid, int step, enum target_signal siggnal)
 577 {
 578   if (PIDGET (inferior_ptid) != 42)
 579     error ("The program is not being run.");
 580
 581   if (sr_get_debug ())
 582     printf_filtered ("gdbsim_resume: step %d, signal %d\n", step, siggnal);
 583
 584   resume_siggnal = siggnal;
 585   resume_step = step;
 586 }
 587
 588 /* Notify the simulator of an asynchronous request to stop.
 589
 590    The simulator shall ensure that the stop request is eventually
 591    delivered to the simulator.  If the call is made while the
 592    simulator is not running then the stop request is processed when
 593    the simulator is next resumed.
 594
 595    For simulators that do not support this operation, just abort */
 596
 597 static void
 598 gdbsim_stop (void)
 599 {
 600   if (!sim_stop (gdbsim_desc))
 601     {
 602       quit ();
 603     }
 604 }
 605
 606 /* GDB version of os_poll_quit callback.
 607    Taken from gdb/util.c - should be in a library */
 608
 609 static int
 610 gdb_os_poll_quit (host_callback *p)
 611 {
 612   if (ui_loop_hook != NULL)
 613     ui_loop_hook (0);
 614
 615   if (quit_flag)                /* gdb's idea of quit */
 616     {
 617       quit_flag = 0;            /* we've stolen it */
 618       return 1;
 619     }
 620   else if (immediate_quit)
 621     {
 622       return 1;
 623     }
 624   return 0;
 625 }
 626
 627 /* Wait for inferior process to do something.  Return pid of child,
 628    or -1 in case of error; store status through argument pointer STATUS,
 629    just as `wait' would. */
 630
 631 static void
 632 gdbsim_cntrl_c (int signo)
 633 {
 634   gdbsim_stop ();
 635 }
 636
 637 static ptid_t
 638 gdbsim_wait (ptid_t ptid, struct target_waitstatus *status)
 639 {
 640   static RETSIGTYPE (*prev_sigint) ();
 641   int sigrc = 0;
 642   enum sim_stop reason = sim_running;
 643
 644   if (sr_get_debug ())
 645     printf_filtered ("gdbsim_wait\n");
 646
 647 #if defined (HAVE_SIGACTION) && defined (SA_RESTART)
 648   {
 649     struct sigaction sa, osa;
 650     sa.sa_handler = gdbsim_cntrl_c;
 651     sigemptyset (&sa.sa_mask);
 652     sa.sa_flags = 0;
 653     sigaction (SIGINT, &sa, &osa);
 654     prev_sigint = osa.sa_handler;
 655   }
 656 #else
 657   prev_sigint = signal (SIGINT, gdbsim_cntrl_c);
 658 #endif
 659   sim_resume (gdbsim_desc, resume_step,
 660               target_signal_to_host (resume_siggnal));
 661   signal (SIGINT, prev_sigint);
 662   resume_step = 0;
 663
 664   sim_stop_reason (gdbsim_desc, &reason, &sigrc);
 665
 666   switch (reason)
 667     {
 668     case sim_exited:
 669       status->kind = TARGET_WAITKIND_EXITED;
 670       status->value.integer = sigrc;
 671       break;
 672     case sim_stopped:
 673       switch (sigrc)
 674         {
 675         case SIGABRT:
 676           quit ();
 677           break;
 678         case SIGINT:
 679         case SIGTRAP:
 680         default:
 681           status->kind = TARGET_WAITKIND_STOPPED;
 682           /* The signal in sigrc is a host signal.  That probably
 683              should be fixed.  */
 684           status->value.sig = target_signal_from_host (sigrc);
 685           break;
 686         }
 687       break;
 688     case sim_signalled:
 689       status->kind = TARGET_WAITKIND_SIGNALLED;
 690       /* The signal in sigrc is a host signal.  That probably
 691          should be fixed.  */
 692       status->value.sig = target_signal_from_host (sigrc);
 693       break;
 694     case sim_running:
 695     case sim_polling:
 696       /* FIXME: Is this correct? */
 697       break;
 698     }
 699
 700   return inferior_ptid;
 701 }
 702
 703 /* Get ready to modify the registers array.  On machines which store
 704    individual registers, this doesn't need to do anything.  On machines
 705    which store all the registers in one fell swoop, this makes sure
 706    that registers contains all the registers from the program being
 707    debugged.  */
 708
 709 static void
 710 gdbsim_prepare_to_store (void)
 711 {
 712   /* Do nothing, since we can store individual regs */
 713 }
 714
 715 /* Transfer LEN bytes between GDB address MYADDR and target address
 716    MEMADDR.  If WRITE is non-zero, transfer them to the target,
 717    otherwise transfer them from the target.  TARGET is unused.
 718
 719    Returns the number of bytes transferred. */
 720
 721 static int
 722 gdbsim_xfer_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len,
 723                              int write, struct mem_attrib *attrib,
 724                              struct target_ops *target)
 725 {
 726   if (!program_loaded)
 727     error ("No program loaded.");
 728
 729   if (sr_get_debug ())
 730     {
 731       /* FIXME: Send to something other than STDOUT? */
 732       printf_filtered ("gdbsim_xfer_inferior_memory: myaddr 0x");
 733       gdb_print_host_address (myaddr, gdb_stdout);
 734       printf_filtered (", memaddr 0x%s, len %d, write %d\n",
 735                        paddr_nz (memaddr), len, write);
 736       if (sr_get_debug () && write)
 737         dump_mem (myaddr, len);
 738     }
 739
 740   if (write)
 741     {
 742       len = sim_write (gdbsim_desc, memaddr, myaddr, len);
 743     }
 744   else
 745     {
 746       len = sim_read (gdbsim_desc, memaddr, myaddr, len);
 747       if (sr_get_debug () && len > 0)
 748         dump_mem (myaddr, len);
 749     }
 750   return len;
 751 }
 752
 753 static void
 754 gdbsim_files_info (struct target_ops *target)
 755 {
 756   char *file = "nothing";
 757
 758   if (exec_bfd)
 759     file = bfd_get_filename (exec_bfd);
 760
 761   if (sr_get_debug ())
 762     printf_filtered ("gdbsim_files_info: file \"%s\"\n", file);
 763
 764   if (exec_bfd)
 765     {
 766       printf_filtered ("\tAttached to %s running program %s\n",
 767                        target_shortname, file);
 768       sim_info (gdbsim_desc, 0);
 769     }
 770 }
 771
 772 /* Clear the simulator's notion of what the break points are.  */
 773
 774 static void
 775 gdbsim_mourn_inferior (void)
 776 {
 777   if (sr_get_debug ())
 778     printf_filtered ("gdbsim_mourn_inferior:\n");
 779
 780   remove_breakpoints ();
 781   generic_mourn_inferior ();
 782 }
 783
 784 static int
 785 gdbsim_insert_breakpoint (CORE_ADDR addr, char *contents_cache)
 786 {
 787 #ifdef SIM_HAS_BREAKPOINTS
 788   SIM_RC retcode;
 789
 790   retcode = sim_set_breakpoint (gdbsim_desc, addr);
 791
 792   switch (retcode)
 793     {
 794     case SIM_RC_OK:
 795       return 0;
 796     case SIM_RC_INSUFFICIENT_RESOURCES:
 797       return ENOMEM;
 798     default:
 799       return EIO;
 800     }
 801 #else
 802   return memory_insert_breakpoint (addr, contents_cache);
 803 #endif
 804 }
 805
 806 static int
 807 gdbsim_remove_breakpoint (CORE_ADDR addr, char *contents_cache)
 808 {
 809 #ifdef SIM_HAS_BREAKPOINTS
 810   SIM_RC retcode;
 811
 812   retcode = sim_clear_breakpoint (gdbsim_desc, addr);
 813
 814   switch (retcode)
 815     {
 816     case SIM_RC_OK:
 817     case SIM_RC_UNKNOWN_BREAKPOINT:
 818       return 0;
 819     case SIM_RC_INSUFFICIENT_RESOURCES:
 820       return ENOMEM;
 821     default:
 822       return EIO;
 823     }
 824 #else
 825   return memory_remove_breakpoint (addr, contents_cache);
 826 #endif
 827 }
 828
 829 /* Pass the command argument through to the simulator verbatim.  The
 830    simulator must do any command interpretation work.  */
 831
 832 void
 833 simulator_command (char *args, int from_tty)
 834 {
 835   if (gdbsim_desc == NULL)
 836     {
 837
 838       /* PREVIOUSLY: The user may give a command before the simulator
 839          is opened. [...] (??? assuming of course one wishes to
 840          continue to allow commands to be sent to unopened simulators,
 841          which isn't entirely unreasonable). */
 842
 843       /* The simulator is a builtin abstraction of a remote target.
 844          Consistent with that model, access to the simulator, via sim
 845          commands, is restricted to the period when the channel to the
 846          simulator is open. */
 847
 848       error ("Not connected to the simulator target");
 849     }
 850
 851   sim_do_command (gdbsim_desc, args);
 852
 853   /* Invalidate the register cache, in case the simulator command does
 854      something funny. */
 855   registers_changed ();
 856 }
 857
 858 /* Define the target subroutine names */
 859
 860 struct target_ops gdbsim_ops;
 861
 862 static void
 863 init_gdbsim_ops (void)
 864 {
 865   gdbsim_ops.to_shortname = "sim";
 866   gdbsim_ops.to_longname = "simulator";
 867   gdbsim_ops.to_doc = "Use the compiled-in simulator.";
 868   gdbsim_ops.to_open = gdbsim_open;
 869   gdbsim_ops.to_close = gdbsim_close;
 870   gdbsim_ops.to_attach = NULL;
 871   gdbsim_ops.to_post_attach = NULL;
 872   gdbsim_ops.to_require_attach = NULL;
 873   gdbsim_ops.to_detach = gdbsim_detach;
 874   gdbsim_ops.to_require_detach = NULL;
 875   gdbsim_ops.to_resume = gdbsim_resume;
 876   gdbsim_ops.to_wait = gdbsim_wait;
 877   gdbsim_ops.to_post_wait = NULL;
 878   gdbsim_ops.to_fetch_registers = gdbsim_fetch_register;
 879   gdbsim_ops.to_store_registers = gdbsim_store_register;
 880   gdbsim_ops.to_prepare_to_store = gdbsim_prepare_to_store;
 881   gdbsim_ops.to_xfer_memory = gdbsim_xfer_inferior_memory;
 882   gdbsim_ops.to_files_info = gdbsim_files_info;
 883   gdbsim_ops.to_insert_breakpoint = gdbsim_insert_breakpoint;
 884   gdbsim_ops.to_remove_breakpoint = gdbsim_remove_breakpoint;
 885   gdbsim_ops.to_terminal_init = NULL;
 886   gdbsim_ops.to_terminal_inferior = NULL;
 887   gdbsim_ops.to_terminal_ours_for_output = NULL;
 888   gdbsim_ops.to_terminal_ours = NULL;
 889   gdbsim_ops.to_terminal_info = NULL;
 890   gdbsim_ops.to_kill = gdbsim_kill;
 891   gdbsim_ops.to_load = gdbsim_load;
 892   gdbsim_ops.to_lookup_symbol = NULL;
 893   gdbsim_ops.to_create_inferior = gdbsim_create_inferior;
 894   gdbsim_ops.to_post_startup_inferior = NULL;
 895   gdbsim_ops.to_acknowledge_created_inferior = NULL;
 896   gdbsim_ops.to_clone_and_follow_inferior = NULL;
 897   gdbsim_ops.to_post_follow_inferior_by_clone = NULL;
 898   gdbsim_ops.to_insert_fork_catchpoint = NULL;
 899   gdbsim_ops.to_remove_fork_catchpoint = NULL;
 900   gdbsim_ops.to_insert_vfork_catchpoint = NULL;
 901   gdbsim_ops.to_remove_vfork_catchpoint = NULL;
 902   gdbsim_ops.to_has_forked = NULL;
 903   gdbsim_ops.to_has_vforked = NULL;
 904   gdbsim_ops.to_can_follow_vfork_prior_to_exec = NULL;
 905   gdbsim_ops.to_post_follow_vfork = NULL;
 906   gdbsim_ops.to_insert_exec_catchpoint = NULL;
 907   gdbsim_ops.to_remove_exec_catchpoint = NULL;
 908   gdbsim_ops.to_has_execd = NULL;
 909   gdbsim_ops.to_reported_exec_events_per_exec_call = NULL;
 910   gdbsim_ops.to_has_exited = NULL;
 911   gdbsim_ops.to_mourn_inferior = gdbsim_mourn_inferior;
 912   gdbsim_ops.to_can_run = 0;
 913   gdbsim_ops.to_notice_signals = 0;
 914   gdbsim_ops.to_thread_alive = 0;
 915   gdbsim_ops.to_stop = gdbsim_stop;
 916   gdbsim_ops.to_pid_to_exec_file = NULL;
 917   gdbsim_ops.to_stratum = process_stratum;
 918   gdbsim_ops.DONT_USE = NULL;
 919   gdbsim_ops.to_has_all_memory = 1;
 920   gdbsim_ops.to_has_memory = 1;
 921   gdbsim_ops.to_has_stack = 1;
 922   gdbsim_ops.to_has_registers = 1;
 923   gdbsim_ops.to_has_execution = 1;
 924   gdbsim_ops.to_sections = NULL;
 925   gdbsim_ops.to_sections_end = NULL;
 926   gdbsim_ops.to_magic = OPS_MAGIC;
 927
 928 #ifdef TARGET_REDEFINE_DEFAULT_OPS
 929   TARGET_REDEFINE_DEFAULT_OPS (&gdbsim_ops);
 930 #endif
 931 }
 932
 933 void
 934 _initialize_remote_sim (void)
 935 {
 936   init_gdbsim_ops ();
 937   add_target (&gdbsim_ops);
 938
 939   add_com ("sim <command>", class_obscure, simulator_command,
 940            "Send a command to the simulator.");
 941 }