gdb/target.h

   1 /* Interface between GDB and target environments, including files and processes
   2    Copyright 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
   3    Contributed by Cygnus Support.  Written by John Gilmore.
   4
   5 This file is part of GDB.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #if !defined (TARGET_H)
  22 #define TARGET_H
  23
  24 /* This include file defines the interface between the main part
  25    of the debugger, and the part which is target-specific, or
  26    specific to the communications interface between us and the
  27    target.
  28
  29    A TARGET is an interface between the debugger and a particular
  30    kind of file or process.  Targets can be STACKED in STRATA,
  31    so that more than one target can potentially respond to a request.
  32    In particular, memory accesses will walk down the stack of targets
  33    until they find a target that is interested in handling that particular
  34    address.  STRATA are artificial boundaries on the stack, within
  35    which particular kinds of targets live.  Strata exist so that
  36    people don't get confused by pushing e.g. a process target and then
  37    a file target, and wondering why they can't see the current values
  38    of variables any more (the file target is handling them and they
  39    never get to the process target).  So when you push a file target,
  40    it goes into the file stratum, which is always below the process
  41    stratum.  */
  42
  43 #include "bfd.h"
  44
  45 enum strata {
  46         dummy_stratum,          /* The lowest of the low */
  47         file_stratum,           /* Executable files, etc */
  48         core_stratum,           /* Core dump files */
  49         download_stratum,       /* Downloading of remote targets */
  50         process_stratum         /* Executing processes */
  51 };
  52
  53 /* Stuff for target_wait.  */
  54
  55 /* Generally, what has the program done?  */
  56 enum target_waitkind {
  57   /* The program has exited.  The exit status is in value.integer.  */
  58   TARGET_WAITKIND_EXITED,
  59
  60   /* The program has stopped with a signal.  Which signal is in value.sig.  */
  61   TARGET_WAITKIND_STOPPED,
  62
  63   /* The program has terminated with a signal.  Which signal is in
  64      value.sig.  */
  65   TARGET_WAITKIND_SIGNALLED,
  66
  67   /* The program is letting us know that it dynamically loaded something
  68      (e.g. it called load(2) on AIX).  */
  69   TARGET_WAITKIND_LOADED,
  70
  71   /* Nothing happened, but we stopped anyway.  This perhaps should be handled
  72      within target_wait, but I'm not sure target_wait should be resuming the
  73      inferior.  */
  74   TARGET_WAITKIND_SPURIOUS
  75   };
  76
  77 /* The numbering of these signals is chosen to match traditional unix
  78    signals (insofar as various unices use the same numbers, anyway).
  79    It is also the numbering of the GDB remote protocol.  Other remote
  80    protocols, if they use a different numbering, should make sure to
  81    translate appropriately.  */
  82
  83 /* This is based strongly on Unix/POSIX signals for several reasons:
  84    (1) This set of signals represents a widely-accepted attempt to
  85    represent events of this sort in a portable fashion, (2) we want a
  86    signal to make it from wait to child_wait to the user intact, (3) many
  87    remote protocols use a similar encoding.  However, it is
  88    recognized that this set of signals has limitations (such as not
  89    distinguishing between various kinds of SIGSEGV, or not
  90    distinguishing hitting a breakpoint from finishing a single step).
  91    So in the future we may get around this either by adding additional
  92    signals for breakpoint, single-step, etc., or by adding signal
  93    codes; the latter seems more in the spirit of what BSD, System V,
  94    etc. are doing to address these issues.  */
  95
  96 /* For an explanation of what each signal means, see
  97    target_signal_to_string.  */
  98
  99 enum target_signal {
 100   /* Used some places (e.g. stop_signal) to record the concept that
 101      there is no signal.  */
 102   TARGET_SIGNAL_0 = 0,
 103   TARGET_SIGNAL_FIRST = 0,
 104   TARGET_SIGNAL_HUP = 1,
 105   TARGET_SIGNAL_INT = 2,
 106   TARGET_SIGNAL_QUIT = 3,
 107   TARGET_SIGNAL_ILL = 4,
 108   TARGET_SIGNAL_TRAP = 5,
 109   TARGET_SIGNAL_ABRT = 6,
 110   TARGET_SIGNAL_EMT = 7,
 111   TARGET_SIGNAL_FPE = 8,
 112   TARGET_SIGNAL_KILL = 9,
 113   TARGET_SIGNAL_BUS = 10,
 114   TARGET_SIGNAL_SEGV = 11,
 115   TARGET_SIGNAL_SYS = 12,
 116   TARGET_SIGNAL_PIPE = 13,
 117   TARGET_SIGNAL_ALRM = 14,
 118   TARGET_SIGNAL_TERM = 15,
 119   TARGET_SIGNAL_URG = 16,
 120   TARGET_SIGNAL_STOP = 17,
 121   TARGET_SIGNAL_TSTP = 18,
 122   TARGET_SIGNAL_CONT = 19,
 123   TARGET_SIGNAL_CHLD = 20,
 124   TARGET_SIGNAL_TTIN = 21,
 125   TARGET_SIGNAL_TTOU = 22,
 126   TARGET_SIGNAL_IO = 23,
 127   TARGET_SIGNAL_XCPU = 24,
 128   TARGET_SIGNAL_XFSZ = 25,
 129   TARGET_SIGNAL_VTALRM = 26,
 130   TARGET_SIGNAL_PROF = 27,
 131   TARGET_SIGNAL_WINCH = 28,
 132   TARGET_SIGNAL_LOST = 29,
 133   TARGET_SIGNAL_USR1 = 30,
 134   TARGET_SIGNAL_USR2 = 31,
 135   TARGET_SIGNAL_PWR = 32,
 136   /* Similar to SIGIO.  Perhaps they should have the same number.  */
 137   TARGET_SIGNAL_POLL = 33,
 138   TARGET_SIGNAL_WIND = 34,
 139   TARGET_SIGNAL_PHONE = 35,
 140   TARGET_SIGNAL_WAITING = 36,
 141   TARGET_SIGNAL_LWP = 37,
 142   TARGET_SIGNAL_DANGER = 38,
 143   TARGET_SIGNAL_GRANT = 39,
 144   TARGET_SIGNAL_RETRACT = 40,
 145   TARGET_SIGNAL_MSG = 41,
 146   TARGET_SIGNAL_SOUND = 42,
 147   TARGET_SIGNAL_SAK = 43,
 148   TARGET_SIGNAL_PRIO = 44,
 149   TARGET_SIGNAL_REALTIME_33 = 45,
 150   TARGET_SIGNAL_REALTIME_34 = 46,
 151   TARGET_SIGNAL_REALTIME_35 = 47,
 152   TARGET_SIGNAL_REALTIME_36 = 48,
 153   TARGET_SIGNAL_REALTIME_37 = 49,
 154   TARGET_SIGNAL_REALTIME_38 = 50,
 155   TARGET_SIGNAL_REALTIME_39 = 51,
 156   TARGET_SIGNAL_REALTIME_40 = 52,
 157   TARGET_SIGNAL_REALTIME_41 = 53,
 158   TARGET_SIGNAL_REALTIME_42 = 54,
 159   TARGET_SIGNAL_REALTIME_43 = 55,
 160   TARGET_SIGNAL_REALTIME_44 = 56,
 161   TARGET_SIGNAL_REALTIME_45 = 57,
 162   TARGET_SIGNAL_REALTIME_46 = 58,
 163   TARGET_SIGNAL_REALTIME_47 = 59,
 164   TARGET_SIGNAL_REALTIME_48 = 60,
 165   TARGET_SIGNAL_REALTIME_49 = 61,
 166   TARGET_SIGNAL_REALTIME_50 = 62,
 167   TARGET_SIGNAL_REALTIME_51 = 63,
 168   TARGET_SIGNAL_REALTIME_52 = 64,
 169   TARGET_SIGNAL_REALTIME_53 = 65,
 170   TARGET_SIGNAL_REALTIME_54 = 66,
 171   TARGET_SIGNAL_REALTIME_55 = 67,
 172   TARGET_SIGNAL_REALTIME_56 = 68,
 173   TARGET_SIGNAL_REALTIME_57 = 69,
 174   TARGET_SIGNAL_REALTIME_58 = 70,
 175   TARGET_SIGNAL_REALTIME_59 = 71,
 176   TARGET_SIGNAL_REALTIME_60 = 72,
 177   TARGET_SIGNAL_REALTIME_61 = 73,
 178   TARGET_SIGNAL_REALTIME_62 = 74,
 179   TARGET_SIGNAL_REALTIME_63 = 75,
 180
 181   /* Some signal we don't know about.  */
 182   TARGET_SIGNAL_UNKNOWN,
 183
 184   /* Use whatever signal we use when one is not specifically specified
 185      (for passing to proceed and so on).  */
 186   TARGET_SIGNAL_DEFAULT,
 187
 188   /* Last and unused enum value, for sizing arrays, etc.  */
 189   TARGET_SIGNAL_LAST
 190 };
 191
 192 struct target_waitstatus {
 193   enum target_waitkind kind;
 194
 195   /* Exit status or signal number.  */
 196   union {
 197     int integer;
 198     enum target_signal sig;
 199   } value;
 200 };
 201
 202 /* Return the string for a signal.  */
 203 extern char *target_signal_to_string PARAMS ((enum target_signal));
 204
 205 /* Return the name (SIGHUP, etc.) for a signal.  */
 206 extern char *target_signal_to_name PARAMS ((enum target_signal));
 207
 208 /* Given a name (SIGHUP, etc.), return its signal.  */
 209 enum target_signal target_signal_from_name PARAMS ((char *));
 210 \f
 211 /* If certain kinds of activity happen, target_wait should perform
 212    callbacks.  */
 213 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 214    on TARGET_ACTIVITY_FD.   */
 215 extern int target_activity_fd;
 216 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 217 extern int (*target_activity_function) PARAMS ((void));
 218 \f
 219 struct target_ops
 220 {
 221   char         *to_shortname;   /* Name this target type */
 222   char         *to_longname;    /* Name for printing */
 223   char         *to_doc;         /* Documentation.  Does not include trailing
 224                                    newline, and starts with a one-line descrip-
 225                                    tion (probably similar to to_longname). */
 226   void        (*to_open) PARAMS ((char *, int));
 227   void        (*to_close) PARAMS ((int));
 228   void        (*to_attach) PARAMS ((char *, int));
 229   void        (*to_detach) PARAMS ((char *, int));
 230   void        (*to_resume) PARAMS ((int, int, enum target_signal));
 231   int         (*to_wait) PARAMS ((int, struct target_waitstatus *));
 232   void        (*to_fetch_registers) PARAMS ((int));
 233   void        (*to_store_registers) PARAMS ((int));
 234   void        (*to_prepare_to_store) PARAMS ((void));
 235
 236   /* Transfer LEN bytes of memory between GDB address MYADDR and
 237      target address MEMADDR.  If WRITE, transfer them to the target, else
 238      transfer them from the target.  TARGET is the target from which we
 239      get this function.
 240
 241      Return value, N, is one of the following:
 242
 243      0 means that we can't handle this.  If errno has been set, it is the
 244      error which prevented us from doing it (FIXME: What about bfd_error?).
 245
 246      positive (call it N) means that we have transferred N bytes
 247      starting at MEMADDR.  We might be able to handle more bytes
 248      beyond this length, but no promises.
 249
 250      negative (call its absolute value N) means that we cannot
 251      transfer right at MEMADDR, but we could transfer at least
 252      something at MEMADDR + N.  */
 253
 254   int         (*to_xfer_memory) PARAMS ((CORE_ADDR memaddr, char *myaddr,
 255                                          int len, int write,
 256                                          struct target_ops * target));
 257
 258 #if 0
 259   /* Enable this after 4.12.  */
 260
 261   /* Search target memory.  Start at STARTADDR and take LEN bytes of
 262      target memory, and them with MASK, and compare to DATA.  If they
 263      match, set *ADDR_FOUND to the address we found it at, store the data
 264      we found at LEN bytes starting at DATA_FOUND, and return.  If
 265      not, add INCREMENT to the search address and keep trying until
 266      the search address is outside of the range [LORANGE,HIRANGE).
 267
 268      If we don't find anything, set *ADDR_FOUND to (CORE_ADDR)0 and return.  */
 269   void (*to_search) PARAMS ((int len, char *data, char *mask,
 270                              CORE_ADDR startaddr, int increment,
 271                              CORE_ADDR lorange, CORE_ADDR hirange,
 272                              CORE_ADDR *addr_found, char *data_found));
 273
 274 #define target_search(len, data, mask, startaddr, increment, lorange, hirange, addr_found, data_found)  \
 275   (*current_target.to_search) (len, data, mask, startaddr, increment, \
 276                                 lorange, hirange, addr_found, data_found)
 277 #endif /* 0 */
 278
 279   void        (*to_files_info) PARAMS ((struct target_ops *));
 280   int         (*to_insert_breakpoint) PARAMS ((CORE_ADDR, char *));
 281   int         (*to_remove_breakpoint) PARAMS ((CORE_ADDR, char *));
 282   void        (*to_terminal_init) PARAMS ((void));
 283   void        (*to_terminal_inferior) PARAMS ((void));
 284   void        (*to_terminal_ours_for_output) PARAMS ((void));
 285   void        (*to_terminal_ours) PARAMS ((void));
 286   void        (*to_terminal_info) PARAMS ((char *, int));
 287   void        (*to_kill) PARAMS ((void));
 288   void        (*to_load) PARAMS ((char *, int));
 289   int         (*to_lookup_symbol) PARAMS ((char *, CORE_ADDR *));
 290   void        (*to_create_inferior) PARAMS ((char *, char *, char **));
 291   void        (*to_mourn_inferior) PARAMS ((void));
 292   int         (*to_can_run) PARAMS ((void));
 293   void        (*to_notice_signals) PARAMS ((int pid));
 294   int         (*to_thread_alive) PARAMS ((int pid));
 295   void        (*to_stop) PARAMS ((void));
 296   enum strata   to_stratum;
 297   struct target_ops
 298                 *DONT_USE;      /* formerly to_next */
 299   int           to_has_all_memory;
 300   int           to_has_memory;
 301   int           to_has_stack;
 302   int           to_has_registers;
 303   int           to_has_execution;
 304   struct section_table
 305                *to_sections;
 306   struct section_table
 307                *to_sections_end;
 308   int           to_magic;
 309   /* Need sub-structure for target machine related rather than comm related? */
 310 };
 311
 312 /* Magic number for checking ops size.  If a struct doesn't end with this
 313    number, somebody changed the declaration but didn't change all the
 314    places that initialize one.  */
 315
 316 #define OPS_MAGIC       3840
 317
 318 /* The ops structure for our "current" target process.  This should
 319    never be NULL.  If there is no target, it points to the dummy_target.  */
 320
 321 extern struct target_ops        current_target;
 322
 323 /* An item on the target stack.  */
 324
 325 struct target_stack_item
 326 {
 327   struct target_stack_item *next;
 328   struct target_ops *target_ops;
 329 };
 330
 331 /* The target stack.  */
 332
 333 extern struct target_stack_item *target_stack;
 334
 335 /* Define easy words for doing these operations on our current target.  */
 336
 337 #define target_shortname        (current_target.to_shortname)
 338 #define target_longname         (current_target.to_longname)
 339
 340 /* The open routine takes the rest of the parameters from the command,
 341    and (if successful) pushes a new target onto the stack.
 342    Targets should supply this routine, if only to provide an error message.  */
 343 #define target_open(name, from_tty)     \
 344         (*current_target.to_open) (name, from_tty)
 345
 346 /* Does whatever cleanup is required for a target that we are no longer
 347    going to be calling.  Argument says whether we are quitting gdb and
 348    should not get hung in case of errors, or whether we want a clean
 349    termination even if it takes a while.  This routine is automatically
 350    always called just before a routine is popped off the target stack.
 351    Closing file descriptors and freeing memory are typical things it should
 352    do.  */
 353
 354 #define target_close(quitting)  \
 355         (*current_target.to_close) (quitting)
 356
 357 /* Attaches to a process on the target side.  Arguments are as passed
 358    to the `attach' command by the user.  This routine can be called
 359    when the target is not on the target-stack, if the target_can_run
 360    routine returns 1; in that case, it must push itself onto the stack.
 361    Upon exit, the target should be ready for normal operations, and
 362    should be ready to deliver the status of the process immediately
 363    (without waiting) to an upcoming target_wait call.  */
 364
 365 #define target_attach(args, from_tty)   \
 366         (*current_target.to_attach) (args, from_tty)
 367
 368 /* Takes a program previously attached to and detaches it.
 369    The program may resume execution (some targets do, some don't) and will
 370    no longer stop on signals, etc.  We better not have left any breakpoints
 371    in the program or it'll die when it hits one.  ARGS is arguments
 372    typed by the user (e.g. a signal to send the process).  FROM_TTY
 373    says whether to be verbose or not.  */
 374
 375 extern void
 376 target_detach PARAMS ((char *, int));
 377
 378 /* Resume execution of the target process PID.  STEP says whether to
 379    single-step or to run free; SIGGNAL is the signal to be given to
 380    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 381    pass TARGET_SIGNAL_DEFAULT.  */
 382
 383 #define target_resume(pid, step, siggnal)       \
 384         (*current_target.to_resume) (pid, step, siggnal)
 385
 386 /* Wait for process pid to do something.  Pid = -1 to wait for any pid
 387    to do something.  Return pid of child, or -1 in case of error;
 388    store status through argument pointer STATUS.  Note that it is
 389    *not* OK to return_to_top_level out of target_wait without popping
 390    the debugging target from the stack; GDB isn't prepared to get back
 391    to the prompt with a debugging target but without the frame cache,
 392    stop_pc, etc., set up.  */
 393
 394 #define target_wait(pid, status)                \
 395         (*current_target.to_wait) (pid, status)
 396
 397 /* Fetch register REGNO, or all regs if regno == -1.  No result.  */
 398
 399 #define target_fetch_registers(regno)   \
 400         (*current_target.to_fetch_registers) (regno)
 401
 402 /* Store at least register REGNO, or all regs if REGNO == -1.
 403    It can store as many registers as it wants to, so target_prepare_to_store
 404    must have been previously called.  Calls error() if there are problems.  */
 405
 406 #define target_store_registers(regs)    \
 407         (*current_target.to_store_registers) (regs)
 408
 409 /* Get ready to modify the registers array.  On machines which store
 410    individual registers, this doesn't need to do anything.  On machines
 411    which store all the registers in one fell swoop, this makes sure
 412    that REGISTERS contains all the registers from the program being
 413    debugged.  */
 414
 415 #define target_prepare_to_store()       \
 416         (*current_target.to_prepare_to_store) ()
 417
 418 extern int target_read_string PARAMS ((CORE_ADDR, char **, int, int *));
 419
 420 extern int
 421 target_read_memory PARAMS ((CORE_ADDR, char *, int));
 422
 423 extern int
 424 target_read_memory_partial PARAMS ((CORE_ADDR, char *, int, int *));
 425
 426 extern int
 427 target_write_memory PARAMS ((CORE_ADDR, char *, int));
 428
 429 extern int
 430 xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
 431
 432 extern int
 433 child_xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
 434
 435 /* Transfer LEN bytes between target address MEMADDR and GDB address MYADDR.
 436    Returns 0 for success, errno code for failure (which includes partial
 437    transfers--if you want a more useful response to partial transfers, try
 438    target_read_memory_partial).  */
 439
 440 extern int target_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr,
 441                                        int len, int write));
 442
 443 /* From exec.c */
 444
 445 extern void
 446 print_section_info PARAMS ((struct target_ops *, bfd *));
 447
 448 /* Print a line about the current target.  */
 449
 450 #define target_files_info()     \
 451         (*current_target.to_files_info) (&current_target)
 452
 453 /* Insert a breakpoint at address ADDR in the target machine.
 454    SAVE is a pointer to memory allocated for saving the
 455    target contents.  It is guaranteed by the caller to be long enough
 456    to save "sizeof BREAKPOINT" bytes.  Result is 0 for success, or
 457    an errno value.  */
 458
 459 #define target_insert_breakpoint(addr, save)    \
 460         (*current_target.to_insert_breakpoint) (addr, save)
 461
 462 /* Remove a breakpoint at address ADDR in the target machine.
 463    SAVE is a pointer to the same save area
 464    that was previously passed to target_insert_breakpoint.
 465    Result is 0 for success, or an errno value.  */
 466
 467 #define target_remove_breakpoint(addr, save)    \
 468         (*current_target.to_remove_breakpoint) (addr, save)
 469
 470 /* Initialize the terminal settings we record for the inferior,
 471    before we actually run the inferior.  */
 472
 473 #define target_terminal_init() \
 474         (*current_target.to_terminal_init) ()
 475
 476 /* Put the inferior's terminal settings into effect.
 477    This is preparation for starting or resuming the inferior.  */
 478
 479 #define target_terminal_inferior() \
 480         (*current_target.to_terminal_inferior) ()
 481
 482 /* Put some of our terminal settings into effect,
 483    enough to get proper results from our output,
 484    but do not change into or out of RAW mode
 485    so that no input is discarded.
 486
 487    After doing this, either terminal_ours or terminal_inferior
 488    should be called to get back to a normal state of affairs.  */
 489
 490 #define target_terminal_ours_for_output() \
 491         (*current_target.to_terminal_ours_for_output) ()
 492
 493 /* Put our terminal settings into effect.
 494    First record the inferior's terminal settings
 495    so they can be restored properly later.  */
 496
 497 #define target_terminal_ours() \
 498         (*current_target.to_terminal_ours) ()
 499
 500 /* Print useful information about our terminal status, if such a thing
 501    exists.  */
 502
 503 #define target_terminal_info(arg, from_tty) \
 504         (*current_target.to_terminal_info) (arg, from_tty)
 505
 506 /* Kill the inferior process.   Make it go away.  */
 507
 508 #define target_kill() \
 509         (*current_target.to_kill) ()
 510
 511 /* Load an executable file into the target process.  This is expected to
 512    not only bring new code into the target process, but also to update
 513    GDB's symbol tables to match.  */
 514
 515 #define target_load(arg, from_tty) \
 516         (*current_target.to_load) (arg, from_tty)
 517
 518 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 519    name.  ADDRP is a CORE_ADDR * pointing to where the value of the symbol
 520    should be returned.  The result is 0 if successful, nonzero if the
 521    symbol does not exist in the target environment.  This function should
 522    not call error() if communication with the target is interrupted, since
 523    it is called from symbol reading, but should return nonzero, possibly
 524    doing a complain().  */
 525
 526 #define target_lookup_symbol(name, addrp)       \
 527   (*current_target.to_lookup_symbol) (name, addrp)
 528
 529 /* Start an inferior process and set inferior_pid to its pid.
 530    EXEC_FILE is the file to run.
 531    ALLARGS is a string containing the arguments to the program.
 532    ENV is the environment vector to pass.  Errors reported with error().
 533    On VxWorks and various standalone systems, we ignore exec_file.  */
 534
 535 #define target_create_inferior(exec_file, args, env)    \
 536         (*current_target.to_create_inferior) (exec_file, args, env)
 537
 538 /* The inferior process has died.  Do what is right.  */
 539
 540 #define target_mourn_inferior() \
 541         (*current_target.to_mourn_inferior) ()
 542
 543 /* Does target have enough data to do a run or attach command? */
 544
 545 #define target_can_run(t) \
 546         ((t)->to_can_run) ()
 547
 548 /* post process changes to signal handling in the inferior.  */
 549
 550 #define target_notice_signals(pid) \
 551         (*current_target.to_notice_signals) (pid)
 552
 553 /* Check to see if a thread is still alive.  */
 554
 555 #define target_thread_alive(pid) \
 556         (*current_target.to_thread_alive) (pid)
 557
 558 /* Make target stop in a continuable fashion.  (For instance, under Unix, this
 559    should act like SIGSTOP).  This function is normally used by GUIs to
 560    implement a stop button.  */
 561
 562 #define target_stop() current_target.to_stop ()
 563
 564 /* Pointer to next target in the chain, e.g. a core file and an exec file.  */
 565
 566 #define target_next \
 567         (current_target.to_next)
 568
 569 /* Does the target include all of memory, or only part of it?  This
 570    determines whether we look up the target chain for other parts of
 571    memory if this target can't satisfy a request.  */
 572
 573 #define target_has_all_memory   \
 574         (current_target.to_has_all_memory)
 575
 576 /* Does the target include memory?  (Dummy targets don't.)  */
 577
 578 #define target_has_memory       \
 579         (current_target.to_has_memory)
 580
 581 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 582    we start a process.)  */
 583
 584 #define target_has_stack        \
 585         (current_target.to_has_stack)
 586
 587 /* Does the target have registers?  (Exec files don't.)  */
 588
 589 #define target_has_registers    \
 590         (current_target.to_has_registers)
 591
 592 /* Does the target have execution?  Can we make it jump (through
 593    hoops), or pop its stack a few times?  FIXME: If this is to work that
 594    way, it needs to check whether an inferior actually exists.
 595    remote-udi.c and probably other targets can be the current target
 596    when the inferior doesn't actually exist at the moment.  Right now
 597    this just tells us whether this target is *capable* of execution.  */
 598
 599 #define target_has_execution    \
 600         (current_target.to_has_execution)
 601
 602 extern void target_link PARAMS ((char *, CORE_ADDR *));
 603
 604 /* Converts a process id to a string.  Usually, the string just contains
 605    `process xyz', but on some systems it may contain
 606    `process xyz thread abc'.  */
 607
 608 #ifndef target_pid_to_str
 609 #define target_pid_to_str(PID) \
 610         normal_pid_to_str (PID)
 611 extern char *normal_pid_to_str PARAMS ((int pid));
 612 #endif
 613
 614 #ifndef target_new_objfile
 615 #define target_new_objfile(OBJFILE)
 616 #endif
 617
 618 /* Hook to call target-dependant code after reading in a new symbol table. */
 619
 620 #ifndef TARGET_SYMFILE_POSTREAD
 621 #define TARGET_SYMFILE_POSTREAD(OBJFILE)
 622 #endif
 623
 624 /* Hook to call target dependant code just after inferior target process has
 625    started.  */
 626
 627 #ifndef TARGET_CREATE_INFERIOR_HOOK
 628 #define TARGET_CREATE_INFERIOR_HOOK(PID)
 629 #endif
 630
 631 /* Hardware watchpoint interfaces.  */
 632
 633 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
 634    write).  */
 635
 636 #ifndef STOPPED_BY_WATCHPOINT
 637 #define STOPPED_BY_WATCHPOINT(w) 0
 638 #endif
 639
 640 /* Provide defaults for systems that don't support hardware watchpoints. */
 641
 642 #ifndef TARGET_HAS_HARDWARE_WATCHPOINTS
 643
 644 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
 645    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
 646    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
 647    (including this one?).  OTHERTYPE is who knows what...  */
 648
 649 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) 0
 650
 651 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 1
 652    for read and 2 for read/write accesses.  Returns 0 for success, non-zero for
 653    failure.  */
 654
 655 #define target_remove_watchpoint(ADDR,LEN,TYPE) -1
 656 #define target_insert_watchpoint(ADDR,LEN,TYPE) -1
 657
 658 #endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */
 659
 660 #ifndef target_insert_hw_breakpoint
 661 #define target_remove_hw_breakpoint(ADDR,SHADOW) -1
 662 #define target_insert_hw_breakpoint(ADDR,SHADOW) -1
 663 #endif
 664
 665 #ifndef target_stopped_data_address
 666 #define target_stopped_data_address() 0
 667 #endif
 668
 669 /* If defined, then we need to decr pc by this much after a hardware break-
 670    point.  Presumably this overrides DECR_PC_AFTER_BREAK...  */
 671
 672 #ifndef DECR_PC_AFTER_HW_BREAK
 673 #define DECR_PC_AFTER_HW_BREAK 0
 674 #endif
 675
 676 /* Routines for maintenance of the target structures...
 677
 678    add_target:   Add a target to the list of all possible targets.
 679
 680    push_target:  Make this target the top of the stack of currently used
 681                  targets, within its particular stratum of the stack.  Result
 682                  is 0 if now atop the stack, nonzero if not on top (maybe
 683                  should warn user).
 684
 685    unpush_target: Remove this from the stack of currently used targets,
 686                  no matter where it is on the list.  Returns 0 if no
 687                  change, 1 if removed from stack.
 688
 689    pop_target:   Remove the top thing on the stack of current targets.  */
 690
 691 extern void
 692 add_target PARAMS ((struct target_ops *));
 693
 694 extern int
 695 push_target PARAMS ((struct target_ops *));
 696
 697 extern int
 698 unpush_target PARAMS ((struct target_ops *));
 699
 700 extern void
 701 target_preopen PARAMS ((int));
 702
 703 extern void
 704 pop_target PARAMS ((void));
 705
 706 /* Struct section_table maps address ranges to file sections.  It is
 707    mostly used with BFD files, but can be used without (e.g. for handling
 708    raw disks, or files not in formats handled by BFD).  */
 709
 710 struct section_table {
 711   CORE_ADDR addr;               /* Lowest address in section */
 712   CORE_ADDR endaddr;            /* 1+highest address in section */
 713
 714   sec_ptr the_bfd_section;
 715
 716   bfd      *bfd;                /* BFD file pointer */
 717 };
 718
 719 /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
 720    Returns 0 if OK, 1 on error.  */
 721
 722 extern int
 723 build_section_table PARAMS ((bfd *, struct section_table **,
 724                              struct section_table **));
 725
 726 /* From mem-break.c */
 727
 728 extern int
 729 memory_remove_breakpoint PARAMS ((CORE_ADDR, char *));
 730
 731 extern int
 732 memory_insert_breakpoint PARAMS ((CORE_ADDR, char *));
 733
 734 /* From target.c */
 735
 736 void
 737 noprocess PARAMS ((void));
 738
 739 void
 740 find_default_attach PARAMS ((char *, int));
 741
 742 void
 743 find_default_create_inferior PARAMS ((char *, char *, char **));
 744
 745 struct target_ops *
 746 find_core_target PARAMS ((void));
 747 \f
 748 /* Stuff that should be shared among the various remote targets.  */
 749
 750 /* Debugging level.  0 is off, and non-zero values mean to print some debug
 751    information (higher values, more information).  */
 752 extern int remote_debug;
 753
 754 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
 755 extern int baud_rate;
 756 /* Timeout limit for response from target. */
 757 extern int remote_timeout;
 758 \f
 759 /* Functions for helping to write a native target.  */
 760
 761 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
 762 extern void store_waitstatus PARAMS ((struct target_waitstatus *, int));
 763
 764 /* Convert between host signal numbers and enum target_signal's.  */
 765 extern enum target_signal target_signal_from_host PARAMS ((int));
 766 extern int target_signal_to_host PARAMS ((enum target_signal));
 767
 768 /* Convert from a number used in a GDB command to an enum target_signal.  */
 769 extern enum target_signal target_signal_from_command PARAMS ((int));
 770
 771 #endif  /* !defined (TARGET_H) */