gdb/target.h

   1 /* Interface between GDB and target environments, including files and processes
   2    Copyright 1990, 91, 92, 93, 94, 1999 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,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #if !defined (TARGET_H)
  23 #define TARGET_H
  24
  25 /* This include file defines the interface between the main part
  26    of the debugger, and the part which is target-specific, or
  27    specific to the communications interface between us and the
  28    target.
  29
  30    A TARGET is an interface between the debugger and a particular
  31    kind of file or process.  Targets can be STACKED in STRATA,
  32    so that more than one target can potentially respond to a request.
  33    In particular, memory accesses will walk down the stack of targets
  34    until they find a target that is interested in handling that particular
  35    address.  STRATA are artificial boundaries on the stack, within
  36    which particular kinds of targets live.  Strata exist so that
  37    people don't get confused by pushing e.g. a process target and then
  38    a file target, and wondering why they can't see the current values
  39    of variables any more (the file target is handling them and they
  40    never get to the process target).  So when you push a file target,
  41    it goes into the file stratum, which is always below the process
  42    stratum.  */
  43
  44 #include "bfd.h"
  45 #include "symtab.h"
  46
  47 enum strata
  48   {
  49     dummy_stratum,              /* The lowest of the low */
  50     file_stratum,               /* Executable files, etc */
  51     core_stratum,               /* Core dump files */
  52     download_stratum,           /* Downloading of remote targets */
  53     process_stratum,            /* Executing processes */
  54     thread_stratum              /* Executing threads */
  55   };
  56
  57 enum thread_control_capabilities
  58   {
  59     tc_none = 0,                /* Default: can't control thread execution. */
  60     tc_schedlock = 1,           /* Can lock the thread scheduler. */
  61     tc_switch = 2               /* Can switch the running thread on demand. */
  62   };
  63
  64 /* Stuff for target_wait.  */
  65
  66 /* Generally, what has the program done?  */
  67 enum target_waitkind
  68   {
  69     /* The program has exited.  The exit status is in value.integer.  */
  70     TARGET_WAITKIND_EXITED,
  71
  72     /* The program has stopped with a signal.  Which signal is in value.sig.  */
  73     TARGET_WAITKIND_STOPPED,
  74
  75     /* The program has terminated with a signal.  Which signal is in
  76        value.sig.  */
  77     TARGET_WAITKIND_SIGNALLED,
  78
  79     /* The program is letting us know that it dynamically loaded something
  80        (e.g. it called load(2) on AIX).  */
  81     TARGET_WAITKIND_LOADED,
  82
  83     /* The program has forked.  A "related" process' ID is in value.related_pid.
  84        I.e., if the child forks, value.related_pid is the parent's ID.
  85      */
  86     TARGET_WAITKIND_FORKED,
  87
  88     /* The program has vforked.  A "related" process's ID is in value.related_pid.
  89      */
  90     TARGET_WAITKIND_VFORKED,
  91
  92     /* The program has exec'ed a new executable file.  The new file's pathname
  93        is pointed to by value.execd_pathname.
  94      */
  95     TARGET_WAITKIND_EXECD,
  96
  97     /* The program has entered or returned from a system call.  On HP-UX, this
  98        is used in the hardware watchpoint implementation.  The syscall's unique
  99        integer ID number is in value.syscall_id;
 100      */
 101     TARGET_WAITKIND_SYSCALL_ENTRY,
 102     TARGET_WAITKIND_SYSCALL_RETURN,
 103
 104     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 105        within target_wait, but I'm not sure target_wait should be resuming the
 106        inferior.  */
 107     TARGET_WAITKIND_SPURIOUS
 108   };
 109
 110 /* The numbering of these signals is chosen to match traditional unix
 111    signals (insofar as various unices use the same numbers, anyway).
 112    It is also the numbering of the GDB remote protocol.  Other remote
 113    protocols, if they use a different numbering, should make sure to
 114    translate appropriately.
 115
 116    Since these numbers have actually made it out into other software
 117    (stubs, etc.), you mustn't disturb the assigned numbering.  If you
 118    need to add new signals here, add them to the end of the explicitly
 119    numbered signals.
 120
 121    This is based strongly on Unix/POSIX signals for several reasons:
 122    (1) This set of signals represents a widely-accepted attempt to
 123    represent events of this sort in a portable fashion, (2) we want a
 124    signal to make it from wait to child_wait to the user intact, (3) many
 125    remote protocols use a similar encoding.  However, it is
 126    recognized that this set of signals has limitations (such as not
 127    distinguishing between various kinds of SIGSEGV, or not
 128    distinguishing hitting a breakpoint from finishing a single step).
 129    So in the future we may get around this either by adding additional
 130    signals for breakpoint, single-step, etc., or by adding signal
 131    codes; the latter seems more in the spirit of what BSD, System V,
 132    etc. are doing to address these issues.  */
 133
 134 /* For an explanation of what each signal means, see
 135    target_signal_to_string.  */
 136
 137 enum target_signal
 138   {
 139     /* Used some places (e.g. stop_signal) to record the concept that
 140        there is no signal.  */
 141     TARGET_SIGNAL_0 = 0,
 142     TARGET_SIGNAL_FIRST = 0,
 143     TARGET_SIGNAL_HUP = 1,
 144     TARGET_SIGNAL_INT = 2,
 145     TARGET_SIGNAL_QUIT = 3,
 146     TARGET_SIGNAL_ILL = 4,
 147     TARGET_SIGNAL_TRAP = 5,
 148     TARGET_SIGNAL_ABRT = 6,
 149     TARGET_SIGNAL_EMT = 7,
 150     TARGET_SIGNAL_FPE = 8,
 151     TARGET_SIGNAL_KILL = 9,
 152     TARGET_SIGNAL_BUS = 10,
 153     TARGET_SIGNAL_SEGV = 11,
 154     TARGET_SIGNAL_SYS = 12,
 155     TARGET_SIGNAL_PIPE = 13,
 156     TARGET_SIGNAL_ALRM = 14,
 157     TARGET_SIGNAL_TERM = 15,
 158     TARGET_SIGNAL_URG = 16,
 159     TARGET_SIGNAL_STOP = 17,
 160     TARGET_SIGNAL_TSTP = 18,
 161     TARGET_SIGNAL_CONT = 19,
 162     TARGET_SIGNAL_CHLD = 20,
 163     TARGET_SIGNAL_TTIN = 21,
 164     TARGET_SIGNAL_TTOU = 22,
 165     TARGET_SIGNAL_IO = 23,
 166     TARGET_SIGNAL_XCPU = 24,
 167     TARGET_SIGNAL_XFSZ = 25,
 168     TARGET_SIGNAL_VTALRM = 26,
 169     TARGET_SIGNAL_PROF = 27,
 170     TARGET_SIGNAL_WINCH = 28,
 171     TARGET_SIGNAL_LOST = 29,
 172     TARGET_SIGNAL_USR1 = 30,
 173     TARGET_SIGNAL_USR2 = 31,
 174     TARGET_SIGNAL_PWR = 32,
 175     /* Similar to SIGIO.  Perhaps they should have the same number.  */
 176     TARGET_SIGNAL_POLL = 33,
 177     TARGET_SIGNAL_WIND = 34,
 178     TARGET_SIGNAL_PHONE = 35,
 179     TARGET_SIGNAL_WAITING = 36,
 180     TARGET_SIGNAL_LWP = 37,
 181     TARGET_SIGNAL_DANGER = 38,
 182     TARGET_SIGNAL_GRANT = 39,
 183     TARGET_SIGNAL_RETRACT = 40,
 184     TARGET_SIGNAL_MSG = 41,
 185     TARGET_SIGNAL_SOUND = 42,
 186     TARGET_SIGNAL_SAK = 43,
 187     TARGET_SIGNAL_PRIO = 44,
 188     TARGET_SIGNAL_REALTIME_33 = 45,
 189     TARGET_SIGNAL_REALTIME_34 = 46,
 190     TARGET_SIGNAL_REALTIME_35 = 47,
 191     TARGET_SIGNAL_REALTIME_36 = 48,
 192     TARGET_SIGNAL_REALTIME_37 = 49,
 193     TARGET_SIGNAL_REALTIME_38 = 50,
 194     TARGET_SIGNAL_REALTIME_39 = 51,
 195     TARGET_SIGNAL_REALTIME_40 = 52,
 196     TARGET_SIGNAL_REALTIME_41 = 53,
 197     TARGET_SIGNAL_REALTIME_42 = 54,
 198     TARGET_SIGNAL_REALTIME_43 = 55,
 199     TARGET_SIGNAL_REALTIME_44 = 56,
 200     TARGET_SIGNAL_REALTIME_45 = 57,
 201     TARGET_SIGNAL_REALTIME_46 = 58,
 202     TARGET_SIGNAL_REALTIME_47 = 59,
 203     TARGET_SIGNAL_REALTIME_48 = 60,
 204     TARGET_SIGNAL_REALTIME_49 = 61,
 205     TARGET_SIGNAL_REALTIME_50 = 62,
 206     TARGET_SIGNAL_REALTIME_51 = 63,
 207     TARGET_SIGNAL_REALTIME_52 = 64,
 208     TARGET_SIGNAL_REALTIME_53 = 65,
 209     TARGET_SIGNAL_REALTIME_54 = 66,
 210     TARGET_SIGNAL_REALTIME_55 = 67,
 211     TARGET_SIGNAL_REALTIME_56 = 68,
 212     TARGET_SIGNAL_REALTIME_57 = 69,
 213     TARGET_SIGNAL_REALTIME_58 = 70,
 214     TARGET_SIGNAL_REALTIME_59 = 71,
 215     TARGET_SIGNAL_REALTIME_60 = 72,
 216     TARGET_SIGNAL_REALTIME_61 = 73,
 217     TARGET_SIGNAL_REALTIME_62 = 74,
 218     TARGET_SIGNAL_REALTIME_63 = 75,
 219
 220     /* Used internally by Solaris threads.  See signal(5) on Solaris.  */
 221     TARGET_SIGNAL_CANCEL = 76,
 222
 223     /* Yes, this pains me, too.  But LynxOS didn't have SIG32, and now
 224        Linux does, and we can't disturb the numbering, since it's part
 225        of the protocol.  Note that in some GDB's TARGET_SIGNAL_REALTIME_32
 226        is number 76.  */
 227     TARGET_SIGNAL_REALTIME_32,
 228
 229 #if defined(MACH) || defined(__MACH__)
 230     /* Mach exceptions */
 231     TARGET_EXC_BAD_ACCESS,
 232     TARGET_EXC_BAD_INSTRUCTION,
 233     TARGET_EXC_ARITHMETIC,
 234     TARGET_EXC_EMULATION,
 235     TARGET_EXC_SOFTWARE,
 236     TARGET_EXC_BREAKPOINT,
 237 #endif
 238     TARGET_SIGNAL_INFO,
 239
 240     /* Some signal we don't know about.  */
 241     TARGET_SIGNAL_UNKNOWN,
 242
 243     /* Use whatever signal we use when one is not specifically specified
 244        (for passing to proceed and so on).  */
 245     TARGET_SIGNAL_DEFAULT,
 246
 247     /* Last and unused enum value, for sizing arrays, etc.  */
 248     TARGET_SIGNAL_LAST
 249   };
 250
 251 struct target_waitstatus
 252   {
 253     enum target_waitkind kind;
 254
 255     /* Forked child pid, execd pathname, exit status or signal number.  */
 256     union
 257       {
 258         int integer;
 259         enum target_signal sig;
 260         int related_pid;
 261         char *execd_pathname;
 262         int syscall_id;
 263       }
 264     value;
 265   };
 266
 267 /* Possible types of events that the inferior handler will have to
 268    deal with. */
 269 enum inferior_event_type
 270   {
 271     /* There is a request to quit the inferior, abandon it. */
 272     INF_QUIT_REQ,
 273     /* Process a normal inferior event which will result in target_wait
 274        being called. */
 275     INF_REG_EVENT,
 276     /* Deal with an error on the inferior. */
 277     INF_ERROR,
 278     /* We are called because a timer went off. */
 279     INF_TIMER,
 280     /* We are called to do stuff after the inferior stops. */
 281     INF_EXEC_COMPLETE
 282   };
 283
 284 /* Return the string for a signal.  */
 285 extern char *target_signal_to_string PARAMS ((enum target_signal));
 286
 287 /* Return the name (SIGHUP, etc.) for a signal.  */
 288 extern char *target_signal_to_name PARAMS ((enum target_signal));
 289
 290 /* Given a name (SIGHUP, etc.), return its signal.  */
 291 enum target_signal target_signal_from_name PARAMS ((char *));
 292 \f
 293
 294 /* If certain kinds of activity happen, target_wait should perform
 295    callbacks.  */
 296 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 297    on TARGET_ACTIVITY_FD.   */
 298 extern int target_activity_fd;
 299 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 300 extern int (*target_activity_function) PARAMS ((void));
 301 \f
 302 struct target_ops
 303   {
 304     char *to_shortname;         /* Name this target type */
 305     char *to_longname;          /* Name for printing */
 306     char *to_doc;               /* Documentation.  Does not include trailing
 307                                    newline, and starts with a one-line descrip-
 308                                    tion (probably similar to to_longname). */
 309     void (*to_open) PARAMS ((char *, int));
 310     void (*to_close) PARAMS ((int));
 311     void (*to_attach) PARAMS ((char *, int));
 312     void (*to_post_attach) PARAMS ((int));
 313     void (*to_require_attach) PARAMS ((char *, int));
 314     void (*to_detach) PARAMS ((char *, int));
 315     void (*to_require_detach) PARAMS ((int, char *, int));
 316     void (*to_resume) PARAMS ((int, int, enum target_signal));
 317     int (*to_wait) PARAMS ((int, struct target_waitstatus *));
 318     void (*to_post_wait) PARAMS ((int, int));
 319     void (*to_fetch_registers) PARAMS ((int));
 320     void (*to_store_registers) PARAMS ((int));
 321     void (*to_prepare_to_store) PARAMS ((void));
 322
 323     /* Transfer LEN bytes of memory between GDB address MYADDR and
 324        target address MEMADDR.  If WRITE, transfer them to the target, else
 325        transfer them from the target.  TARGET is the target from which we
 326        get this function.
 327
 328        Return value, N, is one of the following:
 329
 330        0 means that we can't handle this.  If errno has been set, it is the
 331        error which prevented us from doing it (FIXME: What about bfd_error?).
 332
 333        positive (call it N) means that we have transferred N bytes
 334        starting at MEMADDR.  We might be able to handle more bytes
 335        beyond this length, but no promises.
 336
 337        negative (call its absolute value N) means that we cannot
 338        transfer right at MEMADDR, but we could transfer at least
 339        something at MEMADDR + N.  */
 340
 341     int (*to_xfer_memory) PARAMS ((CORE_ADDR memaddr, char *myaddr,
 342                                    int len, int write,
 343                                    struct target_ops * target));
 344
 345 #if 0
 346     /* Enable this after 4.12.  */
 347
 348     /* Search target memory.  Start at STARTADDR and take LEN bytes of
 349        target memory, and them with MASK, and compare to DATA.  If they
 350        match, set *ADDR_FOUND to the address we found it at, store the data
 351        we found at LEN bytes starting at DATA_FOUND, and return.  If
 352        not, add INCREMENT to the search address and keep trying until
 353        the search address is outside of the range [LORANGE,HIRANGE).
 354
 355        If we don't find anything, set *ADDR_FOUND to (CORE_ADDR)0 and return.  */
 356     void (*to_search) PARAMS ((int len, char *data, char *mask,
 357                                CORE_ADDR startaddr, int increment,
 358                                CORE_ADDR lorange, CORE_ADDR hirange,
 359                                CORE_ADDR * addr_found, char *data_found));
 360
 361 #define target_search(len, data, mask, startaddr, increment, lorange, hirange, addr_found, data_found)  \
 362   (*current_target.to_search) (len, data, mask, startaddr, increment, \
 363                                 lorange, hirange, addr_found, data_found)
 364 #endif                          /* 0 */
 365
 366     void (*to_files_info) PARAMS ((struct target_ops *));
 367     int (*to_insert_breakpoint) PARAMS ((CORE_ADDR, char *));
 368     int (*to_remove_breakpoint) PARAMS ((CORE_ADDR, char *));
 369     void (*to_terminal_init) PARAMS ((void));
 370     void (*to_terminal_inferior) PARAMS ((void));
 371     void (*to_terminal_ours_for_output) PARAMS ((void));
 372     void (*to_terminal_ours) PARAMS ((void));
 373     void (*to_terminal_info) PARAMS ((char *, int));
 374     void (*to_kill) PARAMS ((void));
 375     void (*to_load) PARAMS ((char *, int));
 376     int (*to_lookup_symbol) PARAMS ((char *, CORE_ADDR *));
 377     void (*to_create_inferior) PARAMS ((char *, char *, char **));
 378     void (*to_post_startup_inferior) PARAMS ((int));
 379     void (*to_acknowledge_created_inferior) PARAMS ((int));
 380     void (*to_clone_and_follow_inferior) PARAMS ((int, int *));
 381     void (*to_post_follow_inferior_by_clone) PARAMS ((void));
 382     int (*to_insert_fork_catchpoint) PARAMS ((int));
 383     int (*to_remove_fork_catchpoint) PARAMS ((int));
 384     int (*to_insert_vfork_catchpoint) PARAMS ((int));
 385     int (*to_remove_vfork_catchpoint) PARAMS ((int));
 386     int (*to_has_forked) PARAMS ((int, int *));
 387     int (*to_has_vforked) PARAMS ((int, int *));
 388     int (*to_can_follow_vfork_prior_to_exec) PARAMS ((void));
 389     void (*to_post_follow_vfork) PARAMS ((int, int, int, int));
 390     int (*to_insert_exec_catchpoint) PARAMS ((int));
 391     int (*to_remove_exec_catchpoint) PARAMS ((int));
 392     int (*to_has_execd) PARAMS ((int, char **));
 393     int (*to_reported_exec_events_per_exec_call) PARAMS ((void));
 394     int (*to_has_syscall_event) PARAMS ((int, enum target_waitkind *, int *));
 395     int (*to_has_exited) PARAMS ((int, int, int *));
 396     void (*to_mourn_inferior) PARAMS ((void));
 397     int (*to_can_run) PARAMS ((void));
 398     void (*to_notice_signals) PARAMS ((int pid));
 399     int (*to_thread_alive) PARAMS ((int pid));
 400     void (*to_find_new_threads) PARAMS ((void));
 401     void (*to_stop) PARAMS ((void));
 402     int (*to_query) PARAMS ((int /*char */ , char *, char *, int *));
 403     void (*to_rcmd) (char *command, struct gdb_file *output);
 404     struct symtab_and_line *(*to_enable_exception_callback) PARAMS ((enum exception_event_kind, int));
 405     struct exception_event_record *(*to_get_current_exception_event) PARAMS ((void));
 406     char *(*to_pid_to_exec_file) PARAMS ((int pid));
 407     char *(*to_core_file_to_sym_file) PARAMS ((char *));
 408     enum strata to_stratum;
 409     struct target_ops
 410      *DONT_USE;                 /* formerly to_next */
 411     int to_has_all_memory;
 412     int to_has_memory;
 413     int to_has_stack;
 414     int to_has_registers;
 415     int to_has_execution;
 416     int to_has_thread_control;  /* control thread execution */
 417     struct section_table
 418      *to_sections;
 419     struct section_table
 420      *to_sections_end;
 421     /* ASYNC target controls */
 422     int (*to_can_async_p) (void);
 423     int (*to_is_async_p) (void);
 424     void (*to_async) (void (*cb) (enum inferior_event_type, void *context), void *context);
 425     int to_magic;
 426     /* Need sub-structure for target machine related rather than comm related? */
 427   };
 428
 429 /* Magic number for checking ops size.  If a struct doesn't end with this
 430    number, somebody changed the declaration but didn't change all the
 431    places that initialize one.  */
 432
 433 #define OPS_MAGIC       3840
 434
 435 /* The ops structure for our "current" target process.  This should
 436    never be NULL.  If there is no target, it points to the dummy_target.  */
 437
 438 extern struct target_ops current_target;
 439
 440 /* An item on the target stack.  */
 441
 442 struct target_stack_item
 443   {
 444     struct target_stack_item *next;
 445     struct target_ops *target_ops;
 446   };
 447
 448 /* The target stack.  */
 449
 450 extern struct target_stack_item *target_stack;
 451
 452 /* Define easy words for doing these operations on our current target.  */
 453
 454 #define target_shortname        (current_target.to_shortname)
 455 #define target_longname         (current_target.to_longname)
 456
 457 /* The open routine takes the rest of the parameters from the command,
 458    and (if successful) pushes a new target onto the stack.
 459    Targets should supply this routine, if only to provide an error message.  */
 460 #define target_open(name, from_tty)     \
 461         (*current_target.to_open) (name, from_tty)
 462
 463 /* Does whatever cleanup is required for a target that we are no longer
 464    going to be calling.  Argument says whether we are quitting gdb and
 465    should not get hung in case of errors, or whether we want a clean
 466    termination even if it takes a while.  This routine is automatically
 467    always called just before a routine is popped off the target stack.
 468    Closing file descriptors and freeing memory are typical things it should
 469    do.  */
 470
 471 #define target_close(quitting)  \
 472         (*current_target.to_close) (quitting)
 473
 474 /* Attaches to a process on the target side.  Arguments are as passed
 475    to the `attach' command by the user.  This routine can be called
 476    when the target is not on the target-stack, if the target_can_run
 477    routine returns 1; in that case, it must push itself onto the stack.
 478    Upon exit, the target should be ready for normal operations, and
 479    should be ready to deliver the status of the process immediately
 480    (without waiting) to an upcoming target_wait call.  */
 481
 482 #define target_attach(args, from_tty)   \
 483         (*current_target.to_attach) (args, from_tty)
 484
 485 /* The target_attach operation places a process under debugger control,
 486    and stops the process.
 487
 488    This operation provides a target-specific hook that allows the
 489    necessary bookkeeping to be performed after an attach completes.
 490  */
 491 #define target_post_attach(pid) \
 492         (*current_target.to_post_attach) (pid)
 493
 494 /* Attaches to a process on the target side, if not already attached.
 495    (If already attached, takes no action.)
 496
 497    This operation can be used to follow the child process of a fork.
 498    On some targets, such child processes of an original inferior process
 499    are automatically under debugger control, and thus do not require an
 500    actual attach operation.  */
 501
 502 #define target_require_attach(args, from_tty)   \
 503         (*current_target.to_require_attach) (args, from_tty)
 504
 505 /* Takes a program previously attached to and detaches it.
 506    The program may resume execution (some targets do, some don't) and will
 507    no longer stop on signals, etc.  We better not have left any breakpoints
 508    in the program or it'll die when it hits one.  ARGS is arguments
 509    typed by the user (e.g. a signal to send the process).  FROM_TTY
 510    says whether to be verbose or not.  */
 511
 512 extern void
 513 target_detach PARAMS ((char *, int));
 514
 515 /* Detaches from a process on the target side, if not already dettached.
 516    (If already detached, takes no action.)
 517
 518    This operation can be used to follow the parent process of a fork.
 519    On some targets, such child processes of an original inferior process
 520    are automatically under debugger control, and thus do require an actual
 521    detach operation.
 522
 523    PID is the process id of the child to detach from.
 524    ARGS is arguments typed by the user (e.g. a signal to send the process).
 525    FROM_TTY says whether to be verbose or not.  */
 526
 527 #define target_require_detach(pid, args, from_tty) \
 528         (*current_target.to_require_detach) (pid, args, from_tty)
 529
 530 /* Resume execution of the target process PID.  STEP says whether to
 531    single-step or to run free; SIGGNAL is the signal to be given to
 532    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 533    pass TARGET_SIGNAL_DEFAULT.  */
 534
 535 #define target_resume(pid, step, siggnal)       \
 536         (*current_target.to_resume) (pid, step, siggnal)
 537
 538 /* Wait for process pid to do something.  Pid = -1 to wait for any pid
 539    to do something.  Return pid of child, or -1 in case of error;
 540    store status through argument pointer STATUS.  Note that it is
 541    *not* OK to return_to_top_level out of target_wait without popping
 542    the debugging target from the stack; GDB isn't prepared to get back
 543    to the prompt with a debugging target but without the frame cache,
 544    stop_pc, etc., set up.  */
 545
 546 #define target_wait(pid, status)                \
 547         (*current_target.to_wait) (pid, status)
 548
 549 /* The target_wait operation waits for a process event to occur, and
 550    thereby stop the process.
 551
 552    On some targets, certain events may happen in sequences.  gdb's
 553    correct response to any single event of such a sequence may require
 554    knowledge of what earlier events in the sequence have been seen.
 555
 556    This operation provides a target-specific hook that allows the
 557    necessary bookkeeping to be performed to track such sequences.
 558  */
 559
 560 #define target_post_wait(pid, status) \
 561         (*current_target.to_post_wait) (pid, status)
 562
 563 /* Fetch register REGNO, or all regs if regno == -1.  No result.  */
 564
 565 #define target_fetch_registers(regno)   \
 566         (*current_target.to_fetch_registers) (regno)
 567
 568 /* Store at least register REGNO, or all regs if REGNO == -1.
 569    It can store as many registers as it wants to, so target_prepare_to_store
 570    must have been previously called.  Calls error() if there are problems.  */
 571
 572 #define target_store_registers(regs)    \
 573         (*current_target.to_store_registers) (regs)
 574
 575 /* Get ready to modify the registers array.  On machines which store
 576    individual registers, this doesn't need to do anything.  On machines
 577    which store all the registers in one fell swoop, this makes sure
 578    that REGISTERS contains all the registers from the program being
 579    debugged.  */
 580
 581 #define target_prepare_to_store()       \
 582         (*current_target.to_prepare_to_store) ()
 583
 584 extern int target_read_string PARAMS ((CORE_ADDR, char **, int, int *));
 585
 586 extern int
 587 target_read_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, int len));
 588
 589 extern int
 590 target_read_memory_section PARAMS ((CORE_ADDR memaddr, char *myaddr, int len,
 591                                     asection * bfd_section));
 592
 593 extern int
 594 target_read_memory_partial PARAMS ((CORE_ADDR, char *, int, int *));
 595
 596 extern int
 597 target_write_memory PARAMS ((CORE_ADDR, char *, int));
 598
 599 extern int
 600 xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
 601
 602 extern int
 603 child_xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
 604
 605 extern char *
 606   child_pid_to_exec_file PARAMS ((int));
 607
 608 extern char *
 609   child_core_file_to_sym_file PARAMS ((char *));
 610
 611 #if defined(CHILD_POST_ATTACH)
 612 extern void
 613 child_post_attach PARAMS ((int));
 614 #endif
 615
 616 extern void
 617 child_post_wait PARAMS ((int, int));
 618
 619 extern void
 620 child_post_startup_inferior PARAMS ((int));
 621
 622 extern void
 623 child_acknowledge_created_inferior PARAMS ((int));
 624
 625 extern void
 626 child_clone_and_follow_inferior PARAMS ((int, int *));
 627
 628 extern void
 629 child_post_follow_inferior_by_clone PARAMS ((void));
 630
 631 extern int
 632 child_insert_fork_catchpoint PARAMS ((int));
 633
 634 extern int
 635 child_remove_fork_catchpoint PARAMS ((int));
 636
 637 extern int
 638 child_insert_vfork_catchpoint PARAMS ((int));
 639
 640 extern int
 641 child_remove_vfork_catchpoint PARAMS ((int));
 642
 643 extern int
 644 child_has_forked PARAMS ((int, int *));
 645
 646 extern int
 647 child_has_vforked PARAMS ((int, int *));
 648
 649 extern void
 650 child_acknowledge_created_inferior PARAMS ((int));
 651
 652 extern int
 653 child_can_follow_vfork_prior_to_exec PARAMS ((void));
 654
 655 extern void
 656 child_post_follow_vfork PARAMS ((int, int, int, int));
 657
 658 extern int
 659 child_insert_exec_catchpoint PARAMS ((int));
 660
 661 extern int
 662 child_remove_exec_catchpoint PARAMS ((int));
 663
 664 extern int
 665 child_has_execd PARAMS ((int, char **));
 666
 667 extern int
 668 child_reported_exec_events_per_exec_call PARAMS ((void));
 669
 670 extern int
 671 child_has_syscall_event PARAMS ((int, enum target_waitkind *, int *));
 672
 673 extern int
 674 child_has_exited PARAMS ((int, int, int *));
 675
 676 extern int
 677 child_thread_alive PARAMS ((int));
 678
 679 /* From exec.c */
 680
 681 extern void
 682 print_section_info PARAMS ((struct target_ops *, bfd *));
 683
 684 /* Print a line about the current target.  */
 685
 686 #define target_files_info()     \
 687         (*current_target.to_files_info) (&current_target)
 688
 689 /* Insert a breakpoint at address ADDR in the target machine.
 690    SAVE is a pointer to memory allocated for saving the
 691    target contents.  It is guaranteed by the caller to be long enough
 692    to save "sizeof BREAKPOINT" bytes.  Result is 0 for success, or
 693    an errno value.  */
 694
 695 #define target_insert_breakpoint(addr, save)    \
 696         (*current_target.to_insert_breakpoint) (addr, save)
 697
 698 /* Remove a breakpoint at address ADDR in the target machine.
 699    SAVE is a pointer to the same save area
 700    that was previously passed to target_insert_breakpoint.
 701    Result is 0 for success, or an errno value.  */
 702
 703 #define target_remove_breakpoint(addr, save)    \
 704         (*current_target.to_remove_breakpoint) (addr, save)
 705
 706 /* Initialize the terminal settings we record for the inferior,
 707    before we actually run the inferior.  */
 708
 709 #define target_terminal_init() \
 710         (*current_target.to_terminal_init) ()
 711
 712 /* Put the inferior's terminal settings into effect.
 713    This is preparation for starting or resuming the inferior.  */
 714
 715 #define target_terminal_inferior() \
 716         (*current_target.to_terminal_inferior) ()
 717
 718 /* Put some of our terminal settings into effect,
 719    enough to get proper results from our output,
 720    but do not change into or out of RAW mode
 721    so that no input is discarded.
 722
 723    After doing this, either terminal_ours or terminal_inferior
 724    should be called to get back to a normal state of affairs.  */
 725
 726 #define target_terminal_ours_for_output() \
 727         (*current_target.to_terminal_ours_for_output) ()
 728
 729 /* Put our terminal settings into effect.
 730    First record the inferior's terminal settings
 731    so they can be restored properly later.  */
 732
 733 #define target_terminal_ours() \
 734         (*current_target.to_terminal_ours) ()
 735
 736 /* Print useful information about our terminal status, if such a thing
 737    exists.  */
 738
 739 #define target_terminal_info(arg, from_tty) \
 740         (*current_target.to_terminal_info) (arg, from_tty)
 741
 742 /* Kill the inferior process.   Make it go away.  */
 743
 744 #define target_kill() \
 745         (*current_target.to_kill) ()
 746
 747 /* Load an executable file into the target process.  This is expected to
 748    not only bring new code into the target process, but also to update
 749    GDB's symbol tables to match.  */
 750
 751 #define target_load(arg, from_tty) \
 752         (*current_target.to_load) (arg, from_tty)
 753
 754 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 755    name.  ADDRP is a CORE_ADDR * pointing to where the value of the symbol
 756    should be returned.  The result is 0 if successful, nonzero if the
 757    symbol does not exist in the target environment.  This function should
 758    not call error() if communication with the target is interrupted, since
 759    it is called from symbol reading, but should return nonzero, possibly
 760    doing a complain().  */
 761
 762 #define target_lookup_symbol(name, addrp)       \
 763   (*current_target.to_lookup_symbol) (name, addrp)
 764
 765 /* Start an inferior process and set inferior_pid to its pid.
 766    EXEC_FILE is the file to run.
 767    ALLARGS is a string containing the arguments to the program.
 768    ENV is the environment vector to pass.  Errors reported with error().
 769    On VxWorks and various standalone systems, we ignore exec_file.  */
 770
 771 #define target_create_inferior(exec_file, args, env)    \
 772         (*current_target.to_create_inferior) (exec_file, args, env)
 773
 774
 775 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 776    notification of inferior events such as fork and vork immediately
 777    after the inferior is created.  (This because of how gdb gets an
 778    inferior created via invoking a shell to do it.  In such a scenario,
 779    if the shell init file has commands in it, the shell will fork and
 780    exec for each of those commands, and we will see each such fork
 781    event.  Very bad.)
 782
 783    Such targets will supply an appropriate definition for this function.
 784  */
 785 #define target_post_startup_inferior(pid) \
 786         (*current_target.to_post_startup_inferior) (pid)
 787
 788 /* On some targets, the sequence of starting up an inferior requires
 789    some synchronization between gdb and the new inferior process, PID.
 790  */
 791 #define target_acknowledge_created_inferior(pid) \
 792         (*current_target.to_acknowledge_created_inferior) (pid)
 793
 794 /* An inferior process has been created via a fork() or similar
 795    system call.  This function will clone the debugger, then ensure
 796    that CHILD_PID is attached to by that debugger.
 797
 798    FOLLOWED_CHILD is set TRUE on return *for the clone debugger only*,
 799    and FALSE otherwise.  (The original and clone debuggers can use this
 800    to determine which they are, if need be.)
 801
 802    (This is not a terribly useful feature without a GUI to prevent
 803    the two debuggers from competing for shell input.)
 804  */
 805 #define target_clone_and_follow_inferior(child_pid,followed_child) \
 806         (*current_target.to_clone_and_follow_inferior) (child_pid, followed_child)
 807
 808 /* This operation is intended to be used as the last in a sequence of
 809    steps taken when following both parent and child of a fork.  This
 810    is used by a clone of the debugger, which will follow the child.
 811
 812    The original debugger has detached from this process, and the
 813    clone has attached to it.
 814
 815    On some targets, this requires a bit of cleanup to make it work
 816    correctly.
 817  */
 818 #define target_post_follow_inferior_by_clone() \
 819         (*current_target.to_post_follow_inferior_by_clone) ()
 820
 821 /* On some targets, we can catch an inferior fork or vfork event when it
 822    occurs.  These functions insert/remove an already-created catchpoint for
 823    such events.
 824  */
 825 #define target_insert_fork_catchpoint(pid) \
 826         (*current_target.to_insert_fork_catchpoint) (pid)
 827
 828 #define target_remove_fork_catchpoint(pid) \
 829         (*current_target.to_remove_fork_catchpoint) (pid)
 830
 831 #define target_insert_vfork_catchpoint(pid) \
 832         (*current_target.to_insert_vfork_catchpoint) (pid)
 833
 834 #define target_remove_vfork_catchpoint(pid) \
 835         (*current_target.to_remove_vfork_catchpoint) (pid)
 836
 837 /* Returns TRUE if PID has invoked the fork() system call.  And,
 838    also sets CHILD_PID to the process id of the other ("child")
 839    inferior process that was created by that call.
 840  */
 841 #define target_has_forked(pid,child_pid) \
 842         (*current_target.to_has_forked) (pid,child_pid)
 843
 844 /* Returns TRUE if PID has invoked the vfork() system call.  And,
 845    also sets CHILD_PID to the process id of the other ("child")
 846    inferior process that was created by that call.
 847  */
 848 #define target_has_vforked(pid,child_pid) \
 849         (*current_target.to_has_vforked) (pid,child_pid)
 850
 851 /* Some platforms (such as pre-10.20 HP-UX) don't allow us to do
 852    anything to a vforked child before it subsequently calls exec().
 853    On such platforms, we say that the debugger cannot "follow" the
 854    child until it has vforked.
 855
 856    This function should be defined to return 1 by those targets
 857    which can allow the debugger to immediately follow a vforked
 858    child, and 0 if they cannot.
 859  */
 860 #define target_can_follow_vfork_prior_to_exec() \
 861         (*current_target.to_can_follow_vfork_prior_to_exec) ()
 862
 863 /* An inferior process has been created via a vfork() system call.
 864    The debugger has followed the parent, the child, or both.  The
 865    process of setting up for that follow may have required some
 866    target-specific trickery to track the sequence of reported events.
 867    If so, this function should be defined by those targets that
 868    require the debugger to perform cleanup or initialization after
 869    the vfork follow.
 870  */
 871 #define target_post_follow_vfork(parent_pid,followed_parent,child_pid,followed_child) \
 872         (*current_target.to_post_follow_vfork) (parent_pid,followed_parent,child_pid,followed_child)
 873
 874 /* On some targets, we can catch an inferior exec event when it
 875    occurs.  These functions insert/remove an already-created catchpoint
 876    for such events.
 877  */
 878 #define target_insert_exec_catchpoint(pid) \
 879         (*current_target.to_insert_exec_catchpoint) (pid)
 880
 881 #define target_remove_exec_catchpoint(pid) \
 882         (*current_target.to_remove_exec_catchpoint) (pid)
 883
 884 /* Returns TRUE if PID has invoked a flavor of the exec() system call.
 885    And, also sets EXECD_PATHNAME to the pathname of the executable file
 886    that was passed to exec(), and is now being executed.
 887  */
 888 #define target_has_execd(pid,execd_pathname) \
 889         (*current_target.to_has_execd) (pid,execd_pathname)
 890
 891 /* Returns the number of exec events that are reported when a process
 892    invokes a flavor of the exec() system call on this target, if exec
 893    events are being reported.
 894  */
 895 #define target_reported_exec_events_per_exec_call() \
 896         (*current_target.to_reported_exec_events_per_exec_call) ()
 897
 898 /* Returns TRUE if PID has reported a syscall event.  And, also sets
 899    KIND to the appropriate TARGET_WAITKIND_, and sets SYSCALL_ID to
 900    the unique integer ID of the syscall.
 901  */
 902 #define target_has_syscall_event(pid,kind,syscall_id) \
 903   (*current_target.to_has_syscall_event) (pid,kind,syscall_id)
 904
 905 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 906    exit code of PID, if any.
 907  */
 908 #define target_has_exited(pid,wait_status,exit_status) \
 909         (*current_target.to_has_exited) (pid,wait_status,exit_status)
 910
 911 /* The debugger has completed a blocking wait() call.  There is now
 912    some process event that must be processed.  This function should
 913    be defined by those targets that require the debugger to perform
 914    cleanup or internal state changes in response to the process event.
 915  */
 916
 917 /* The inferior process has died.  Do what is right.  */
 918
 919 #define target_mourn_inferior() \
 920         (*current_target.to_mourn_inferior) ()
 921
 922 /* Does target have enough data to do a run or attach command? */
 923
 924 #define target_can_run(t) \
 925         ((t)->to_can_run) ()
 926
 927 /* post process changes to signal handling in the inferior.  */
 928
 929 #define target_notice_signals(pid) \
 930         (*current_target.to_notice_signals) (pid)
 931
 932 /* Check to see if a thread is still alive.  */
 933
 934 #define target_thread_alive(pid) \
 935         (*current_target.to_thread_alive) (pid)
 936
 937 /* Query for new threads and add them to the thread list.  */
 938
 939 #define target_find_new_threads() \
 940      do { \
 941        if (current_target.to_find_new_threads) \
 942          (*current_target.to_find_new_threads) (); \
 943      } while (0);
 944
 945 /* Make target stop in a continuable fashion.  (For instance, under Unix, this
 946    should act like SIGSTOP).  This function is normally used by GUIs to
 947    implement a stop button.  */
 948
 949 #define target_stop current_target.to_stop
 950
 951 /* Queries the target side for some information.  The first argument is a
 952    letter specifying the type of the query, which is used to determine who
 953    should process it.  The second argument is a string that specifies which
 954    information is desired and the third is a buffer that carries back the
 955    response from the target side. The fourth parameter is the size of the
 956    output buffer supplied. */
 957
 958 #define target_query(query_type, query, resp_buffer, bufffer_size)      \
 959         (*current_target.to_query) (query_type, query, resp_buffer, bufffer_size)
 960
 961 /* Send the specified COMMAND to the target's monitor
 962    (shell,interpreter) for execution.  The result of the query is
 963    placed in OUTBUF. */
 964
 965 #define target_rcmd(command, outbuf) \
 966      (*current_target.to_rcmd) (command, outbuf)
 967
 968
 969 /* Get the symbol information for a breakpointable routine called when
 970    an exception event occurs.
 971    Intended mainly for C++, and for those
 972    platforms/implementations where such a callback mechanism is available,
 973    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 974    different mechanisms for debugging exceptions. */
 975
 976 #define target_enable_exception_callback(kind, enable) \
 977         (*current_target.to_enable_exception_callback) (kind, enable)
 978
 979 /* Get the current exception event kind -- throw or catch, etc. */
 980
 981 #define target_get_current_exception_event() \
 982         (*current_target.to_get_current_exception_event) ()
 983
 984 /* Pointer to next target in the chain, e.g. a core file and an exec file.  */
 985
 986 #define target_next \
 987         (current_target.to_next)
 988
 989 /* Does the target include all of memory, or only part of it?  This
 990    determines whether we look up the target chain for other parts of
 991    memory if this target can't satisfy a request.  */
 992
 993 #define target_has_all_memory   \
 994         (current_target.to_has_all_memory)
 995
 996 /* Does the target include memory?  (Dummy targets don't.)  */
 997
 998 #define target_has_memory       \
 999         (current_target.to_has_memory)
1000
1001 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
1002    we start a process.)  */
1003
1004 #define target_has_stack        \
1005         (current_target.to_has_stack)
1006
1007 /* Does the target have registers?  (Exec files don't.)  */
1008
1009 #define target_has_registers    \
1010         (current_target.to_has_registers)
1011
1012 /* Does the target have execution?  Can we make it jump (through
1013    hoops), or pop its stack a few times?  FIXME: If this is to work that
1014    way, it needs to check whether an inferior actually exists.
1015    remote-udi.c and probably other targets can be the current target
1016    when the inferior doesn't actually exist at the moment.  Right now
1017    this just tells us whether this target is *capable* of execution.  */
1018
1019 #define target_has_execution    \
1020         (current_target.to_has_execution)
1021
1022 /* Can the target support the debugger control of thread execution?
1023    a) Can it lock the thread scheduler?
1024    b) Can it switch the currently running thread?  */
1025
1026 #define target_can_lock_scheduler \
1027         (current_target.to_has_thread_control & tc_schedlock)
1028
1029 #define target_can_switch_threads \
1030         (current_target.to_has_thread_control & tc_switch)
1031
1032 /* Can the target support asynchronous execution? */
1033 #define target_can_async_p() (current_target.to_can_async_p ())
1034
1035 /* Is the target in asynchronous execution mode? */
1036 #define target_is_async_p() (current_target.to_is_async_p())
1037
1038 /* Put the target in async mode with the specified callback function. */
1039 #define target_async(CALLBACK,CONTEXT) (current_target.to_async((CALLBACK), (CONTEXT)))
1040
1041 extern void target_link PARAMS ((char *, CORE_ADDR *));
1042
1043 /* Converts a process id to a string.  Usually, the string just contains
1044    `process xyz', but on some systems it may contain
1045    `process xyz thread abc'.  */
1046
1047 #ifndef target_pid_to_str
1048 #define target_pid_to_str(PID) \
1049         normal_pid_to_str (PID)
1050 extern char *normal_pid_to_str PARAMS ((int pid));
1051 #endif
1052
1053 #ifndef target_tid_to_str
1054 #define target_tid_to_str(PID) \
1055         normal_pid_to_str (PID)
1056 extern char *normal_pid_to_str PARAMS ((int pid));
1057 #endif
1058
1059
1060 #ifndef target_new_objfile
1061 #define target_new_objfile(OBJFILE)
1062 #endif
1063
1064 #ifndef target_pid_or_tid_to_str
1065 #define target_pid_or_tid_to_str(ID) \
1066         normal_pid_to_str (ID)
1067 #endif
1068
1069 /* Attempts to find the pathname of the executable file
1070    that was run to create a specified process.
1071
1072    The process PID must be stopped when this operation is used.
1073
1074    If the executable file cannot be determined, NULL is returned.
1075
1076    Else, a pointer to a character string containing the pathname
1077    is returned.  This string should be copied into a buffer by
1078    the client if the string will not be immediately used, or if
1079    it must persist.
1080  */
1081
1082 #define target_pid_to_exec_file(pid) \
1083         (current_target.to_pid_to_exec_file) (pid)
1084
1085 /* Hook to call target-dependant code after reading in a new symbol table. */
1086
1087 #ifndef TARGET_SYMFILE_POSTREAD
1088 #define TARGET_SYMFILE_POSTREAD(OBJFILE)
1089 #endif
1090
1091 /* Hook to call target dependant code just after inferior target process has
1092    started.  */
1093
1094 #ifndef TARGET_CREATE_INFERIOR_HOOK
1095 #define TARGET_CREATE_INFERIOR_HOOK(PID)
1096 #endif
1097
1098 /* Hardware watchpoint interfaces.  */
1099
1100 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1101    write).  */
1102
1103 #ifndef STOPPED_BY_WATCHPOINT
1104 #define STOPPED_BY_WATCHPOINT(w) 0
1105 #endif
1106
1107 /* HP-UX supplies these operations, which respectively disable and enable
1108    the memory page-protections that are used to implement hardware watchpoints
1109    on that platform.  See wait_for_inferior's use of these.
1110  */
1111 #if !defined(TARGET_DISABLE_HW_WATCHPOINTS)
1112 #define TARGET_DISABLE_HW_WATCHPOINTS(pid)
1113 #endif
1114
1115 #if !defined(TARGET_ENABLE_HW_WATCHPOINTS)
1116 #define TARGET_ENABLE_HW_WATCHPOINTS(pid)
1117 #endif
1118
1119 /* Provide defaults for systems that don't support hardware watchpoints. */
1120
1121 #ifndef TARGET_HAS_HARDWARE_WATCHPOINTS
1122
1123 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1124    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1125    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1126    (including this one?).  OTHERTYPE is who knows what...  */
1127
1128 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) 0
1129
1130 #if !defined(TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT)
1131 #define TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT(byte_count) \
1132         (LONGEST)(byte_count) <= REGISTER_SIZE
1133 #endif
1134
1135 /* However, some addresses may not be profitable to use hardware to watch,
1136    or may be difficult to understand when the addressed object is out of
1137    scope, and hence should be unwatched.  On some targets, this may have
1138    severe performance penalties, such that we might as well use regular
1139    watchpoints, and save (possibly precious) hardware watchpoints for other
1140    locations.
1141  */
1142 #if !defined(TARGET_RANGE_PROFITABLE_FOR_HW_WATCHPOINT)
1143 #define TARGET_RANGE_PROFITABLE_FOR_HW_WATCHPOINT(pid,start,len) 0
1144 #endif
1145
1146
1147 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1148    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1149    success, non-zero for failure.  */
1150
1151 #define target_remove_watchpoint(ADDR,LEN,TYPE) -1
1152 #define target_insert_watchpoint(ADDR,LEN,TYPE) -1
1153
1154 #endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */
1155
1156 #ifndef target_insert_hw_breakpoint
1157 #define target_remove_hw_breakpoint(ADDR,SHADOW) -1
1158 #define target_insert_hw_breakpoint(ADDR,SHADOW) -1
1159 #endif
1160
1161 #ifndef target_stopped_data_address
1162 #define target_stopped_data_address() 0
1163 #endif
1164
1165 /* If defined, then we need to decr pc by this much after a hardware break-
1166    point.  Presumably this overrides DECR_PC_AFTER_BREAK...  */
1167
1168 #ifndef DECR_PC_AFTER_HW_BREAK
1169 #define DECR_PC_AFTER_HW_BREAK 0
1170 #endif
1171
1172 /* Sometimes gdb may pick up what appears to be a valid target address
1173    from a minimal symbol, but the value really means, essentially,
1174    "This is an index into a table which is populated when the inferior
1175    is run.  Therefore, do not attempt to use this as a PC."
1176  */
1177 #if !defined(PC_REQUIRES_RUN_BEFORE_USE)
1178 #define PC_REQUIRES_RUN_BEFORE_USE(pc) (0)
1179 #endif
1180
1181 /* This will only be defined by a target that supports catching vfork events,
1182    such as HP-UX.
1183
1184    On some targets (such as HP-UX 10.20 and earlier), resuming a newly vforked
1185    child process after it has exec'd, causes the parent process to resume as
1186    well.  To prevent the parent from running spontaneously, such targets should
1187    define this to a function that prevents that from happening.
1188  */
1189 #if !defined(ENSURE_VFORKING_PARENT_REMAINS_STOPPED)
1190 #define ENSURE_VFORKING_PARENT_REMAINS_STOPPED(PID) (0)
1191 #endif
1192
1193 /* This will only be defined by a target that supports catching vfork events,
1194    such as HP-UX.
1195
1196    On some targets (such as HP-UX 10.20 and earlier), a newly vforked child
1197    process must be resumed when it delivers its exec event, before the parent
1198    vfork event will be delivered to us.
1199  */
1200 #if !defined(RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK)
1201 #define RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK() (0)
1202 #endif
1203
1204 /* Routines for maintenance of the target structures...
1205
1206    add_target:   Add a target to the list of all possible targets.
1207
1208    push_target:  Make this target the top of the stack of currently used
1209    targets, within its particular stratum of the stack.  Result
1210    is 0 if now atop the stack, nonzero if not on top (maybe
1211    should warn user).
1212
1213    unpush_target: Remove this from the stack of currently used targets,
1214    no matter where it is on the list.  Returns 0 if no
1215    change, 1 if removed from stack.
1216
1217    pop_target:   Remove the top thing on the stack of current targets.  */
1218
1219 extern void
1220 add_target PARAMS ((struct target_ops *));
1221
1222 extern int
1223 push_target PARAMS ((struct target_ops *));
1224
1225 extern int
1226 unpush_target PARAMS ((struct target_ops *));
1227
1228 extern void
1229 target_preopen PARAMS ((int));
1230
1231 extern void
1232 pop_target PARAMS ((void));
1233
1234 /* Struct section_table maps address ranges to file sections.  It is
1235    mostly used with BFD files, but can be used without (e.g. for handling
1236    raw disks, or files not in formats handled by BFD).  */
1237
1238 struct section_table
1239   {
1240     CORE_ADDR addr;             /* Lowest address in section */
1241     CORE_ADDR endaddr;          /* 1+highest address in section */
1242
1243     sec_ptr the_bfd_section;
1244
1245     bfd *bfd;                   /* BFD file pointer */
1246   };
1247
1248 /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
1249    Returns 0 if OK, 1 on error.  */
1250
1251 extern int
1252 build_section_table PARAMS ((bfd *, struct section_table **,
1253                              struct section_table **));
1254
1255 /* From mem-break.c */
1256
1257 extern int memory_remove_breakpoint PARAMS ((CORE_ADDR, char *));
1258
1259 extern int memory_insert_breakpoint PARAMS ((CORE_ADDR, char *));
1260
1261 extern breakpoint_from_pc_fn memory_breakpoint_from_pc;
1262 #ifndef BREAKPOINT_FROM_PC
1263 #define BREAKPOINT_FROM_PC(pcptr, lenptr) memory_breakpoint_from_pc (pcptr, lenptr)
1264 #endif
1265
1266
1267 /* From target.c */
1268
1269 extern void
1270 initialize_targets PARAMS ((void));
1271
1272 extern void
1273 noprocess PARAMS ((void));
1274
1275 extern void
1276 find_default_attach PARAMS ((char *, int));
1277
1278 void
1279 find_default_require_attach PARAMS ((char *, int));
1280
1281 void
1282 find_default_require_detach PARAMS ((int, char *, int));
1283
1284 extern void
1285 find_default_create_inferior PARAMS ((char *, char *, char **));
1286
1287 void
1288 find_default_clone_and_follow_inferior PARAMS ((int, int *));
1289
1290 extern struct target_ops *find_run_target PARAMS ((void));
1291
1292 extern struct target_ops *
1293   find_core_target PARAMS ((void));
1294
1295 int
1296 target_resize_to_sections PARAMS ((struct target_ops *target, int num_added));
1297 \f
1298 /* Stuff that should be shared among the various remote targets.  */
1299
1300 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1301    information (higher values, more information).  */
1302 extern int remote_debug;
1303
1304 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1305 extern int baud_rate;
1306 /* Timeout limit for response from target. */
1307 extern int remote_timeout;
1308
1309 extern asection *target_memory_bfd_section;
1310 \f
1311 /* Functions for helping to write a native target.  */
1312
1313 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1314 extern void store_waitstatus PARAMS ((struct target_waitstatus *, int));
1315
1316 /* Convert between host signal numbers and enum target_signal's.  */
1317 extern enum target_signal target_signal_from_host PARAMS ((int));
1318 extern int target_signal_to_host PARAMS ((enum target_signal));
1319
1320 /* Convert from a number used in a GDB command to an enum target_signal.  */
1321 extern enum target_signal target_signal_from_command PARAMS ((int));
1322
1323 /* Any target can call this to switch to remote protocol (in remote.c). */
1324 extern void push_remote_target PARAMS ((char *name, int from_tty));
1325 \f
1326 /* Imported from machine dependent code */
1327
1328 #ifndef SOFTWARE_SINGLE_STEP_P
1329 #define SOFTWARE_SINGLE_STEP_P 0
1330 #define SOFTWARE_SINGLE_STEP(sig,bp_p) abort ()
1331 #endif /* SOFTWARE_SINGLE_STEP_P */
1332
1333 /* Blank target vector entries are initialized to target_ignore. */
1334 void target_ignore PARAMS ((void));
1335
1336 /* Macro for getting target's idea of a frame pointer.
1337    FIXME: GDB's whole scheme for dealing with "frames" and
1338    "frame pointers" needs a serious shakedown.  */
1339 #ifndef TARGET_VIRTUAL_FRAME_POINTER
1340 #define TARGET_VIRTUAL_FRAME_POINTER(ADDR, REGP, OFFP) \
1341    do { *(REGP) = FP_REGNUM; *(OFFP) =  0; } while (0)
1342 #endif /* TARGET_VIRTUAL_FRAME_POINTER */
1343
1344 #endif /* !defined (TARGET_H) */