gdb/target.h

   1 /* Interface between GDB and target environments, including files and processes
   2    Copyright 1990-1994, 1999, 2000 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 #include "dcache.h"
  47
  48 enum strata
  49   {
  50     dummy_stratum,              /* The lowest of the low */
  51     file_stratum,               /* Executable files, etc */
  52     core_stratum,               /* Core dump files */
  53     download_stratum,           /* Downloading of remote targets */
  54     process_stratum,            /* Executing processes */
  55     thread_stratum              /* Executing threads */
  56   };
  57
  58 enum thread_control_capabilities
  59   {
  60     tc_none = 0,                /* Default: can't control thread execution.  */
  61     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  62     tc_switch = 2               /* Can switch the running thread on demand.  */
  63   };
  64
  65 /* Stuff for target_wait.  */
  66
  67 /* Generally, what has the program done?  */
  68 enum target_waitkind
  69   {
  70     /* The program has exited.  The exit status is in value.integer.  */
  71     TARGET_WAITKIND_EXITED,
  72
  73     /* The program has stopped with a signal.  Which signal is in
  74        value.sig.  */
  75     TARGET_WAITKIND_STOPPED,
  76
  77     /* The program has terminated with a signal.  Which signal is in
  78        value.sig.  */
  79     TARGET_WAITKIND_SIGNALLED,
  80
  81     /* The program is letting us know that it dynamically loaded something
  82        (e.g. it called load(2) on AIX).  */
  83     TARGET_WAITKIND_LOADED,
  84
  85     /* The program has forked.  A "related" process' ID is in
  86        value.related_pid.  I.e., if the child forks, value.related_pid
  87        is the parent's ID.  */
  88
  89     TARGET_WAITKIND_FORKED,
  90
  91     /* The program has vforked.  A "related" process's ID is in
  92        value.related_pid.  */
  93
  94     TARGET_WAITKIND_VFORKED,
  95
  96     /* The program has exec'ed a new executable file.  The new file's
  97        pathname is pointed to by value.execd_pathname.  */
  98
  99     TARGET_WAITKIND_EXECD,
 100
 101     /* The program has entered or returned from a system call.  On
 102        HP-UX, this is used in the hardware watchpoint implementation.
 103        The syscall's unique integer ID number is in value.syscall_id */
 104
 105     TARGET_WAITKIND_SYSCALL_ENTRY,
 106     TARGET_WAITKIND_SYSCALL_RETURN,
 107
 108     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 109        within target_wait, but I'm not sure target_wait should be resuming the
 110        inferior.  */
 111     TARGET_WAITKIND_SPURIOUS,
 112
 113     /* This is used for target async and extended-async
 114        only. Remote_async_wait() returns this when there is an event
 115        on the inferior, but the rest of the world is not interested in
 116        it. The inferior has not stopped, but has just sent some output
 117        to the console, for instance. In this case, we want to go back
 118        to the event loop and wait there for another event from the
 119        inferior, rather than being stuck in the remote_async_wait()
 120        function. This way the event loop is responsive to other events,
 121        like for instance the user typing.  */
 122     TARGET_WAITKIND_IGNORE
 123   };
 124
 125 /* The numbering of these signals is chosen to match traditional unix
 126    signals (insofar as various unices use the same numbers, anyway).
 127    It is also the numbering of the GDB remote protocol.  Other remote
 128    protocols, if they use a different numbering, should make sure to
 129    translate appropriately.
 130
 131    Since these numbers have actually made it out into other software
 132    (stubs, etc.), you mustn't disturb the assigned numbering.  If you
 133    need to add new signals here, add them to the end of the explicitly
 134    numbered signals.
 135
 136    This is based strongly on Unix/POSIX signals for several reasons:
 137    (1) This set of signals represents a widely-accepted attempt to
 138    represent events of this sort in a portable fashion, (2) we want a
 139    signal to make it from wait to child_wait to the user intact, (3) many
 140    remote protocols use a similar encoding.  However, it is
 141    recognized that this set of signals has limitations (such as not
 142    distinguishing between various kinds of SIGSEGV, or not
 143    distinguishing hitting a breakpoint from finishing a single step).
 144    So in the future we may get around this either by adding additional
 145    signals for breakpoint, single-step, etc., or by adding signal
 146    codes; the latter seems more in the spirit of what BSD, System V,
 147    etc. are doing to address these issues.  */
 148
 149 /* For an explanation of what each signal means, see
 150    target_signal_to_string.  */
 151
 152 enum target_signal
 153   {
 154     /* Used some places (e.g. stop_signal) to record the concept that
 155        there is no signal.  */
 156     TARGET_SIGNAL_0 = 0,
 157     TARGET_SIGNAL_FIRST = 0,
 158     TARGET_SIGNAL_HUP = 1,
 159     TARGET_SIGNAL_INT = 2,
 160     TARGET_SIGNAL_QUIT = 3,
 161     TARGET_SIGNAL_ILL = 4,
 162     TARGET_SIGNAL_TRAP = 5,
 163     TARGET_SIGNAL_ABRT = 6,
 164     TARGET_SIGNAL_EMT = 7,
 165     TARGET_SIGNAL_FPE = 8,
 166     TARGET_SIGNAL_KILL = 9,
 167     TARGET_SIGNAL_BUS = 10,
 168     TARGET_SIGNAL_SEGV = 11,
 169     TARGET_SIGNAL_SYS = 12,
 170     TARGET_SIGNAL_PIPE = 13,
 171     TARGET_SIGNAL_ALRM = 14,
 172     TARGET_SIGNAL_TERM = 15,
 173     TARGET_SIGNAL_URG = 16,
 174     TARGET_SIGNAL_STOP = 17,
 175     TARGET_SIGNAL_TSTP = 18,
 176     TARGET_SIGNAL_CONT = 19,
 177     TARGET_SIGNAL_CHLD = 20,
 178     TARGET_SIGNAL_TTIN = 21,
 179     TARGET_SIGNAL_TTOU = 22,
 180     TARGET_SIGNAL_IO = 23,
 181     TARGET_SIGNAL_XCPU = 24,
 182     TARGET_SIGNAL_XFSZ = 25,
 183     TARGET_SIGNAL_VTALRM = 26,
 184     TARGET_SIGNAL_PROF = 27,
 185     TARGET_SIGNAL_WINCH = 28,
 186     TARGET_SIGNAL_LOST = 29,
 187     TARGET_SIGNAL_USR1 = 30,
 188     TARGET_SIGNAL_USR2 = 31,
 189     TARGET_SIGNAL_PWR = 32,
 190     /* Similar to SIGIO.  Perhaps they should have the same number.  */
 191     TARGET_SIGNAL_POLL = 33,
 192     TARGET_SIGNAL_WIND = 34,
 193     TARGET_SIGNAL_PHONE = 35,
 194     TARGET_SIGNAL_WAITING = 36,
 195     TARGET_SIGNAL_LWP = 37,
 196     TARGET_SIGNAL_DANGER = 38,
 197     TARGET_SIGNAL_GRANT = 39,
 198     TARGET_SIGNAL_RETRACT = 40,
 199     TARGET_SIGNAL_MSG = 41,
 200     TARGET_SIGNAL_SOUND = 42,
 201     TARGET_SIGNAL_SAK = 43,
 202     TARGET_SIGNAL_PRIO = 44,
 203     TARGET_SIGNAL_REALTIME_33 = 45,
 204     TARGET_SIGNAL_REALTIME_34 = 46,
 205     TARGET_SIGNAL_REALTIME_35 = 47,
 206     TARGET_SIGNAL_REALTIME_36 = 48,
 207     TARGET_SIGNAL_REALTIME_37 = 49,
 208     TARGET_SIGNAL_REALTIME_38 = 50,
 209     TARGET_SIGNAL_REALTIME_39 = 51,
 210     TARGET_SIGNAL_REALTIME_40 = 52,
 211     TARGET_SIGNAL_REALTIME_41 = 53,
 212     TARGET_SIGNAL_REALTIME_42 = 54,
 213     TARGET_SIGNAL_REALTIME_43 = 55,
 214     TARGET_SIGNAL_REALTIME_44 = 56,
 215     TARGET_SIGNAL_REALTIME_45 = 57,
 216     TARGET_SIGNAL_REALTIME_46 = 58,
 217     TARGET_SIGNAL_REALTIME_47 = 59,
 218     TARGET_SIGNAL_REALTIME_48 = 60,
 219     TARGET_SIGNAL_REALTIME_49 = 61,
 220     TARGET_SIGNAL_REALTIME_50 = 62,
 221     TARGET_SIGNAL_REALTIME_51 = 63,
 222     TARGET_SIGNAL_REALTIME_52 = 64,
 223     TARGET_SIGNAL_REALTIME_53 = 65,
 224     TARGET_SIGNAL_REALTIME_54 = 66,
 225     TARGET_SIGNAL_REALTIME_55 = 67,
 226     TARGET_SIGNAL_REALTIME_56 = 68,
 227     TARGET_SIGNAL_REALTIME_57 = 69,
 228     TARGET_SIGNAL_REALTIME_58 = 70,
 229     TARGET_SIGNAL_REALTIME_59 = 71,
 230     TARGET_SIGNAL_REALTIME_60 = 72,
 231     TARGET_SIGNAL_REALTIME_61 = 73,
 232     TARGET_SIGNAL_REALTIME_62 = 74,
 233     TARGET_SIGNAL_REALTIME_63 = 75,
 234
 235     /* Used internally by Solaris threads.  See signal(5) on Solaris.  */
 236     TARGET_SIGNAL_CANCEL = 76,
 237
 238     /* Yes, this pains me, too.  But LynxOS didn't have SIG32, and now
 239        Linux does, and we can't disturb the numbering, since it's part
 240        of the protocol.  Note that in some GDB's TARGET_SIGNAL_REALTIME_32
 241        is number 76.  */
 242     TARGET_SIGNAL_REALTIME_32,
 243     /* Yet another pain, IRIX 6 has SIG64.  */
 244     TARGET_SIGNAL_REALTIME_64,
 245
 246 #if defined(MACH) || defined(__MACH__)
 247     /* Mach exceptions */
 248     TARGET_EXC_BAD_ACCESS,
 249     TARGET_EXC_BAD_INSTRUCTION,
 250     TARGET_EXC_ARITHMETIC,
 251     TARGET_EXC_EMULATION,
 252     TARGET_EXC_SOFTWARE,
 253     TARGET_EXC_BREAKPOINT,
 254 #endif
 255     TARGET_SIGNAL_INFO,
 256
 257     /* Some signal we don't know about.  */
 258     TARGET_SIGNAL_UNKNOWN,
 259
 260     /* Use whatever signal we use when one is not specifically specified
 261        (for passing to proceed and so on).  */
 262     TARGET_SIGNAL_DEFAULT,
 263
 264     /* Last and unused enum value, for sizing arrays, etc.  */
 265     TARGET_SIGNAL_LAST
 266   };
 267
 268 struct target_waitstatus
 269   {
 270     enum target_waitkind kind;
 271
 272     /* Forked child pid, execd pathname, exit status or signal number.  */
 273     union
 274       {
 275         int integer;
 276         enum target_signal sig;
 277         int related_pid;
 278         char *execd_pathname;
 279         int syscall_id;
 280       }
 281     value;
 282   };
 283
 284 /* Possible types of events that the inferior handler will have to
 285    deal with.  */
 286 enum inferior_event_type
 287   {
 288     /* There is a request to quit the inferior, abandon it.  */
 289     INF_QUIT_REQ,
 290     /* Process a normal inferior event which will result in target_wait
 291        being called.  */
 292     INF_REG_EVENT,
 293     /* Deal with an error on the inferior.  */
 294     INF_ERROR,
 295     /* We are called because a timer went off.  */
 296     INF_TIMER,
 297     /* We are called to do stuff after the inferior stops.  */
 298     INF_EXEC_COMPLETE,
 299     /* We are called to do some stuff after the inferior stops, but we
 300        are expected to reenter the proceed() and
 301        handle_inferior_event() functions. This is used only in case of
 302        'step n' like commands.  */
 303     INF_EXEC_CONTINUE
 304   };
 305
 306 /* Return the string for a signal.  */
 307 extern char *target_signal_to_string (enum target_signal);
 308
 309 /* Return the name (SIGHUP, etc.) for a signal.  */
 310 extern char *target_signal_to_name (enum target_signal);
 311
 312 /* Given a name (SIGHUP, etc.), return its signal.  */
 313 enum target_signal target_signal_from_name (char *);
 314 \f
 315
 316 /* If certain kinds of activity happen, target_wait should perform
 317    callbacks.  */
 318 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 319    on TARGET_ACTIVITY_FD.  */
 320 extern int target_activity_fd;
 321 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 322 extern int (*target_activity_function) (void);
 323 \f
 324 struct thread_info;             /* fwd decl for parameter list below: */
 325
 326 struct target_ops
 327   {
 328     char *to_shortname;         /* Name this target type */
 329     char *to_longname;          /* Name for printing */
 330     char *to_doc;               /* Documentation.  Does not include trailing
 331                                    newline, and starts with a one-line descrip-
 332                                    tion (probably similar to to_longname).  */
 333     void (*to_open) (char *, int);
 334     void (*to_close) (int);
 335     void (*to_attach) (char *, int);
 336     void (*to_post_attach) (int);
 337     void (*to_require_attach) (char *, int);
 338     void (*to_detach) (char *, int);
 339     void (*to_require_detach) (int, char *, int);
 340     void (*to_resume) (int, int, enum target_signal);
 341     int (*to_wait) (int, struct target_waitstatus *);
 342     void (*to_post_wait) (int, int);
 343     void (*to_fetch_registers) (int);
 344     void (*to_store_registers) (int);
 345     void (*to_prepare_to_store) (void);
 346
 347     /* Transfer LEN bytes of memory between GDB address MYADDR and
 348        target address MEMADDR.  If WRITE, transfer them to the target, else
 349        transfer them from the target.  TARGET is the target from which we
 350        get this function.
 351
 352        Return value, N, is one of the following:
 353
 354        0 means that we can't handle this.  If errno has been set, it is the
 355        error which prevented us from doing it (FIXME: What about bfd_error?).
 356
 357        positive (call it N) means that we have transferred N bytes
 358        starting at MEMADDR.  We might be able to handle more bytes
 359        beyond this length, but no promises.
 360
 361        negative (call its absolute value N) means that we cannot
 362        transfer right at MEMADDR, but we could transfer at least
 363        something at MEMADDR + N.  */
 364
 365     int (*to_xfer_memory) (CORE_ADDR memaddr, char *myaddr,
 366                            int len, int write, struct target_ops * target);
 367
 368 #if 0
 369     /* Enable this after 4.12.  */
 370
 371     /* Search target memory.  Start at STARTADDR and take LEN bytes of
 372        target memory, and them with MASK, and compare to DATA.  If they
 373        match, set *ADDR_FOUND to the address we found it at, store the data
 374        we found at LEN bytes starting at DATA_FOUND, and return.  If
 375        not, add INCREMENT to the search address and keep trying until
 376        the search address is outside of the range [LORANGE,HIRANGE).
 377
 378        If we don't find anything, set *ADDR_FOUND to (CORE_ADDR)0 and
 379        return.  */
 380
 381     void (*to_search) (int len, char *data, char *mask,
 382                        CORE_ADDR startaddr, int increment,
 383                        CORE_ADDR lorange, CORE_ADDR hirange,
 384                        CORE_ADDR * addr_found, char *data_found);
 385
 386 #define target_search(len, data, mask, startaddr, increment, lorange, hirange, addr_found, data_found)  \
 387     (*current_target.to_search) (len, data, mask, startaddr, increment, \
 388                                  lorange, hirange, addr_found, data_found)
 389 #endif                          /* 0 */
 390
 391     void (*to_files_info) (struct target_ops *);
 392     int (*to_insert_breakpoint) (CORE_ADDR, char *);
 393     int (*to_remove_breakpoint) (CORE_ADDR, char *);
 394     void (*to_terminal_init) (void);
 395     void (*to_terminal_inferior) (void);
 396     void (*to_terminal_ours_for_output) (void);
 397     void (*to_terminal_ours) (void);
 398     void (*to_terminal_info) (char *, int);
 399     void (*to_kill) (void);
 400     void (*to_load) (char *, int);
 401     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 402     void (*to_create_inferior) (char *, char *, char **);
 403     void (*to_post_startup_inferior) (int);
 404     void (*to_acknowledge_created_inferior) (int);
 405     void (*to_clone_and_follow_inferior) (int, int *);
 406     void (*to_post_follow_inferior_by_clone) (void);
 407     int (*to_insert_fork_catchpoint) (int);
 408     int (*to_remove_fork_catchpoint) (int);
 409     int (*to_insert_vfork_catchpoint) (int);
 410     int (*to_remove_vfork_catchpoint) (int);
 411     int (*to_has_forked) (int, int *);
 412     int (*to_has_vforked) (int, int *);
 413     int (*to_can_follow_vfork_prior_to_exec) (void);
 414     void (*to_post_follow_vfork) (int, int, int, int);
 415     int (*to_insert_exec_catchpoint) (int);
 416     int (*to_remove_exec_catchpoint) (int);
 417     int (*to_has_execd) (int, char **);
 418     int (*to_reported_exec_events_per_exec_call) (void);
 419     int (*to_has_syscall_event) (int, enum target_waitkind *, int *);
 420     int (*to_has_exited) (int, int, int *);
 421     void (*to_mourn_inferior) (void);
 422     int (*to_can_run) (void);
 423     void (*to_notice_signals) (int pid);
 424     int (*to_thread_alive) (int pid);
 425     void (*to_find_new_threads) (void);
 426     char *(*to_pid_to_str) (int);
 427     char *(*to_extra_thread_info) (struct thread_info *);
 428     void (*to_stop) (void);
 429     int (*to_query) (int /*char */ , char *, char *, int *);
 430     void (*to_rcmd) (char *command, struct ui_file *output);
 431     struct symtab_and_line *(*to_enable_exception_callback) (enum
 432                                                              exception_event_kind,
 433                                                              int);
 434     struct exception_event_record *(*to_get_current_exception_event) (void);
 435     char *(*to_pid_to_exec_file) (int pid);
 436     char *(*to_core_file_to_sym_file) (char *);
 437     enum strata to_stratum;
 438     struct target_ops
 439      *DONT_USE;                 /* formerly to_next */
 440     int to_has_all_memory;
 441     int to_has_memory;
 442     int to_has_stack;
 443     int to_has_registers;
 444     int to_has_execution;
 445     int to_has_thread_control;  /* control thread execution */
 446     struct section_table
 447      *to_sections;
 448     struct section_table
 449      *to_sections_end;
 450     /* ASYNC target controls */
 451     int (*to_can_async_p) (void);
 452     int (*to_is_async_p) (void);
 453     void (*to_async) (void (*cb) (enum inferior_event_type, void *context),
 454                       void *context);
 455     int to_async_mask_value;
 456     int to_magic;
 457     /* Need sub-structure for target machine related rather than comm related?
 458      */
 459   };
 460
 461 /* Magic number for checking ops size.  If a struct doesn't end with this
 462    number, somebody changed the declaration but didn't change all the
 463    places that initialize one.  */
 464
 465 #define OPS_MAGIC       3840
 466
 467 /* The ops structure for our "current" target process.  This should
 468    never be NULL.  If there is no target, it points to the dummy_target.  */
 469
 470 extern struct target_ops current_target;
 471
 472 /* An item on the target stack.  */
 473
 474 struct target_stack_item
 475   {
 476     struct target_stack_item *next;
 477     struct target_ops *target_ops;
 478   };
 479
 480 /* The target stack.  */
 481
 482 extern struct target_stack_item *target_stack;
 483
 484 /* Define easy words for doing these operations on our current target.  */
 485
 486 #define target_shortname        (current_target.to_shortname)
 487 #define target_longname         (current_target.to_longname)
 488
 489 /* The open routine takes the rest of the parameters from the command,
 490    and (if successful) pushes a new target onto the stack.
 491    Targets should supply this routine, if only to provide an error message.  */
 492
 493 #define target_open(name, from_tty)                                     \
 494   do {                                                                  \
 495     dcache_invalidate (target_dcache);                                  \
 496     (*current_target.to_open) (name, from_tty);                         \
 497   } while (0)
 498
 499 /* Does whatever cleanup is required for a target that we are no longer
 500    going to be calling.  Argument says whether we are quitting gdb and
 501    should not get hung in case of errors, or whether we want a clean
 502    termination even if it takes a while.  This routine is automatically
 503    always called just before a routine is popped off the target stack.
 504    Closing file descriptors and freeing memory are typical things it should
 505    do.  */
 506
 507 #define target_close(quitting)  \
 508      (*current_target.to_close) (quitting)
 509
 510 /* Attaches to a process on the target side.  Arguments are as passed
 511    to the `attach' command by the user.  This routine can be called
 512    when the target is not on the target-stack, if the target_can_run
 513    routine returns 1; in that case, it must push itself onto the stack.
 514    Upon exit, the target should be ready for normal operations, and
 515    should be ready to deliver the status of the process immediately
 516    (without waiting) to an upcoming target_wait call.  */
 517
 518 #define target_attach(args, from_tty)   \
 519      (*current_target.to_attach) (args, from_tty)
 520
 521 /* The target_attach operation places a process under debugger control,
 522    and stops the process.
 523
 524    This operation provides a target-specific hook that allows the
 525    necessary bookkeeping to be performed after an attach completes.  */
 526 #define target_post_attach(pid) \
 527      (*current_target.to_post_attach) (pid)
 528
 529 /* Attaches to a process on the target side, if not already attached.
 530    (If already attached, takes no action.)
 531
 532    This operation can be used to follow the child process of a fork.
 533    On some targets, such child processes of an original inferior process
 534    are automatically under debugger control, and thus do not require an
 535    actual attach operation.  */
 536
 537 #define target_require_attach(args, from_tty)   \
 538      (*current_target.to_require_attach) (args, from_tty)
 539
 540 /* Takes a program previously attached to and detaches it.
 541    The program may resume execution (some targets do, some don't) and will
 542    no longer stop on signals, etc.  We better not have left any breakpoints
 543    in the program or it'll die when it hits one.  ARGS is arguments
 544    typed by the user (e.g. a signal to send the process).  FROM_TTY
 545    says whether to be verbose or not.  */
 546
 547 extern void target_detach (char *, int);
 548
 549 /* Detaches from a process on the target side, if not already dettached.
 550    (If already detached, takes no action.)
 551
 552    This operation can be used to follow the parent process of a fork.
 553    On some targets, such child processes of an original inferior process
 554    are automatically under debugger control, and thus do require an actual
 555    detach operation.
 556
 557    PID is the process id of the child to detach from.
 558    ARGS is arguments typed by the user (e.g. a signal to send the process).
 559    FROM_TTY says whether to be verbose or not.  */
 560
 561 #define target_require_detach(pid, args, from_tty)      \
 562      (*current_target.to_require_detach) (pid, args, from_tty)
 563
 564 /* Resume execution of the target process PID.  STEP says whether to
 565    single-step or to run free; SIGGNAL is the signal to be given to
 566    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 567    pass TARGET_SIGNAL_DEFAULT.  */
 568
 569 #define target_resume(pid, step, siggnal)                               \
 570   do {                                                                  \
 571     dcache_invalidate(target_dcache);                                   \
 572     (*current_target.to_resume) (pid, step, siggnal);                   \
 573   } while (0)
 574
 575 /* Wait for process pid to do something.  Pid = -1 to wait for any pid
 576    to do something.  Return pid of child, or -1 in case of error;
 577    store status through argument pointer STATUS.  Note that it is
 578    *not* OK to return_to_top_level out of target_wait without popping
 579    the debugging target from the stack; GDB isn't prepared to get back
 580    to the prompt with a debugging target but without the frame cache,
 581    stop_pc, etc., set up.  */
 582
 583 #define target_wait(pid, status)                \
 584      (*current_target.to_wait) (pid, status)
 585
 586 /* The target_wait operation waits for a process event to occur, and
 587    thereby stop the process.
 588
 589    On some targets, certain events may happen in sequences.  gdb's
 590    correct response to any single event of such a sequence may require
 591    knowledge of what earlier events in the sequence have been seen.
 592
 593    This operation provides a target-specific hook that allows the
 594    necessary bookkeeping to be performed to track such sequences.  */
 595
 596 #define target_post_wait(pid, status) \
 597      (*current_target.to_post_wait) (pid, status)
 598
 599 /* Fetch register REGNO, or all regs if regno == -1.  No result.  */
 600
 601 #define target_fetch_registers(regno)   \
 602      (*current_target.to_fetch_registers) (regno)
 603
 604 /* Store at least register REGNO, or all regs if REGNO == -1.
 605    It can store as many registers as it wants to, so target_prepare_to_store
 606    must have been previously called.  Calls error() if there are problems.  */
 607
 608 #define target_store_registers(regs)    \
 609      (*current_target.to_store_registers) (regs)
 610
 611 /* Get ready to modify the registers array.  On machines which store
 612    individual registers, this doesn't need to do anything.  On machines
 613    which store all the registers in one fell swoop, this makes sure
 614    that REGISTERS contains all the registers from the program being
 615    debugged.  */
 616
 617 #define target_prepare_to_store()       \
 618      (*current_target.to_prepare_to_store) ()
 619
 620 extern DCACHE *target_dcache;
 621
 622 extern int do_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write);
 623
 624 extern int target_read_string (CORE_ADDR, char **, int, int *);
 625
 626 extern int target_read_memory (CORE_ADDR memaddr, char *myaddr, int len);
 627
 628 extern int target_write_memory (CORE_ADDR memaddr, char *myaddr, int len);
 629
 630 extern int xfer_memory (CORE_ADDR, char *, int, int, struct target_ops *);
 631
 632 extern int
 633 child_xfer_memory (CORE_ADDR, char *, int, int, struct target_ops *);
 634
 635 /* Make a single attempt at transfering LEN bytes.  On a successful
 636    transfer, the number of bytes actually transfered is returned and
 637    ERR is set to 0.  When a transfer fails, -1 is returned (the number
 638    of bytes actually transfered is not defined) and ERR is set to a
 639    non-zero error indication.  */
 640
 641 extern int
 642 target_read_memory_partial (CORE_ADDR addr, char *buf, int len, int *err);
 643
 644 extern int
 645 target_write_memory_partial (CORE_ADDR addr, char *buf, int len, int *err);
 646
 647 extern char *child_pid_to_exec_file (int);
 648
 649 extern char *child_core_file_to_sym_file (char *);
 650
 651 #if defined(CHILD_POST_ATTACH)
 652 extern void child_post_attach (int);
 653 #endif
 654
 655 extern void child_post_wait (int, int);
 656
 657 extern void child_post_startup_inferior (int);
 658
 659 extern void child_acknowledge_created_inferior (int);
 660
 661 extern void child_clone_and_follow_inferior (int, int *);
 662
 663 extern void child_post_follow_inferior_by_clone (void);
 664
 665 extern int child_insert_fork_catchpoint (int);
 666
 667 extern int child_remove_fork_catchpoint (int);
 668
 669 extern int child_insert_vfork_catchpoint (int);
 670
 671 extern int child_remove_vfork_catchpoint (int);
 672
 673 extern int child_has_forked (int, int *);
 674
 675 extern int child_has_vforked (int, int *);
 676
 677 extern void child_acknowledge_created_inferior (int);
 678
 679 extern int child_can_follow_vfork_prior_to_exec (void);
 680
 681 extern void child_post_follow_vfork (int, int, int, int);
 682
 683 extern int child_insert_exec_catchpoint (int);
 684
 685 extern int child_remove_exec_catchpoint (int);
 686
 687 extern int child_has_execd (int, char **);
 688
 689 extern int child_reported_exec_events_per_exec_call (void);
 690
 691 extern int child_has_syscall_event (int, enum target_waitkind *, int *);
 692
 693 extern int child_has_exited (int, int, int *);
 694
 695 extern int child_thread_alive (int);
 696
 697 /* From exec.c */
 698
 699 extern void print_section_info (struct target_ops *, bfd *);
 700
 701 /* Print a line about the current target.  */
 702
 703 #define target_files_info()     \
 704      (*current_target.to_files_info) (&current_target)
 705
 706 /* Insert a breakpoint at address ADDR in the target machine.
 707    SAVE is a pointer to memory allocated for saving the
 708    target contents.  It is guaranteed by the caller to be long enough
 709    to save "sizeof BREAKPOINT" bytes.  Result is 0 for success, or
 710    an errno value.  */
 711
 712 #define target_insert_breakpoint(addr, save)    \
 713      (*current_target.to_insert_breakpoint) (addr, save)
 714
 715 /* Remove a breakpoint at address ADDR in the target machine.
 716    SAVE is a pointer to the same save area
 717    that was previously passed to target_insert_breakpoint.
 718    Result is 0 for success, or an errno value.  */
 719
 720 #define target_remove_breakpoint(addr, save)    \
 721      (*current_target.to_remove_breakpoint) (addr, save)
 722
 723 /* Initialize the terminal settings we record for the inferior,
 724    before we actually run the inferior.  */
 725
 726 #define target_terminal_init() \
 727      (*current_target.to_terminal_init) ()
 728
 729 /* Put the inferior's terminal settings into effect.
 730    This is preparation for starting or resuming the inferior.  */
 731
 732 #define target_terminal_inferior() \
 733      (*current_target.to_terminal_inferior) ()
 734
 735 /* Put some of our terminal settings into effect,
 736    enough to get proper results from our output,
 737    but do not change into or out of RAW mode
 738    so that no input is discarded.
 739
 740    After doing this, either terminal_ours or terminal_inferior
 741    should be called to get back to a normal state of affairs.  */
 742
 743 #define target_terminal_ours_for_output() \
 744      (*current_target.to_terminal_ours_for_output) ()
 745
 746 /* Put our terminal settings into effect.
 747    First record the inferior's terminal settings
 748    so they can be restored properly later.  */
 749
 750 #define target_terminal_ours() \
 751      (*current_target.to_terminal_ours) ()
 752
 753 /* Print useful information about our terminal status, if such a thing
 754    exists.  */
 755
 756 #define target_terminal_info(arg, from_tty) \
 757      (*current_target.to_terminal_info) (arg, from_tty)
 758
 759 /* Kill the inferior process.   Make it go away.  */
 760
 761 #define target_kill() \
 762      (*current_target.to_kill) ()
 763
 764 /* Load an executable file into the target process.  This is expected
 765    to not only bring new code into the target process, but also to
 766    update GDB's symbol tables to match.  */
 767
 768 extern void target_load (char *arg, int from_tty);
 769
 770 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 771    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 772    symbol should be returned.  The result is 0 if successful, nonzero
 773    if the symbol does not exist in the target environment.  This
 774    function should not call error() if communication with the target
 775    is interrupted, since it is called from symbol reading, but should
 776    return nonzero, possibly doing a complain().  */
 777
 778 #define target_lookup_symbol(name, addrp) \
 779      (*current_target.to_lookup_symbol) (name, addrp)
 780
 781 /* Start an inferior process and set inferior_pid to its pid.
 782    EXEC_FILE is the file to run.
 783    ALLARGS is a string containing the arguments to the program.
 784    ENV is the environment vector to pass.  Errors reported with error().
 785    On VxWorks and various standalone systems, we ignore exec_file.  */
 786
 787 #define target_create_inferior(exec_file, args, env)    \
 788      (*current_target.to_create_inferior) (exec_file, args, env)
 789
 790
 791 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 792    notification of inferior events such as fork and vork immediately
 793    after the inferior is created.  (This because of how gdb gets an
 794    inferior created via invoking a shell to do it.  In such a scenario,
 795    if the shell init file has commands in it, the shell will fork and
 796    exec for each of those commands, and we will see each such fork
 797    event.  Very bad.)
 798
 799    Such targets will supply an appropriate definition for this function.  */
 800
 801 #define target_post_startup_inferior(pid) \
 802      (*current_target.to_post_startup_inferior) (pid)
 803
 804 /* On some targets, the sequence of starting up an inferior requires
 805    some synchronization between gdb and the new inferior process, PID.  */
 806
 807 #define target_acknowledge_created_inferior(pid) \
 808      (*current_target.to_acknowledge_created_inferior) (pid)
 809
 810 /* An inferior process has been created via a fork() or similar
 811    system call.  This function will clone the debugger, then ensure
 812    that CHILD_PID is attached to by that debugger.
 813
 814    FOLLOWED_CHILD is set TRUE on return *for the clone debugger only*,
 815    and FALSE otherwise.  (The original and clone debuggers can use this
 816    to determine which they are, if need be.)
 817
 818    (This is not a terribly useful feature without a GUI to prevent
 819    the two debuggers from competing for shell input.)  */
 820
 821 #define target_clone_and_follow_inferior(child_pid,followed_child) \
 822      (*current_target.to_clone_and_follow_inferior) (child_pid, followed_child)
 823
 824 /* This operation is intended to be used as the last in a sequence of
 825    steps taken when following both parent and child of a fork.  This
 826    is used by a clone of the debugger, which will follow the child.
 827
 828    The original debugger has detached from this process, and the
 829    clone has attached to it.
 830
 831    On some targets, this requires a bit of cleanup to make it work
 832    correctly.  */
 833
 834 #define target_post_follow_inferior_by_clone() \
 835      (*current_target.to_post_follow_inferior_by_clone) ()
 836
 837 /* On some targets, we can catch an inferior fork or vfork event when
 838    it occurs.  These functions insert/remove an already-created
 839    catchpoint for such events.  */
 840
 841 #define target_insert_fork_catchpoint(pid) \
 842      (*current_target.to_insert_fork_catchpoint) (pid)
 843
 844 #define target_remove_fork_catchpoint(pid) \
 845      (*current_target.to_remove_fork_catchpoint) (pid)
 846
 847 #define target_insert_vfork_catchpoint(pid) \
 848      (*current_target.to_insert_vfork_catchpoint) (pid)
 849
 850 #define target_remove_vfork_catchpoint(pid) \
 851      (*current_target.to_remove_vfork_catchpoint) (pid)
 852
 853 /* Returns TRUE if PID has invoked the fork() system call.  And,
 854    also sets CHILD_PID to the process id of the other ("child")
 855    inferior process that was created by that call.  */
 856
 857 #define target_has_forked(pid,child_pid) \
 858      (*current_target.to_has_forked) (pid,child_pid)
 859
 860 /* Returns TRUE if PID has invoked the vfork() system call.  And,
 861    also sets CHILD_PID to the process id of the other ("child")
 862    inferior process that was created by that call.  */
 863
 864 #define target_has_vforked(pid,child_pid) \
 865      (*current_target.to_has_vforked) (pid,child_pid)
 866
 867 /* Some platforms (such as pre-10.20 HP-UX) don't allow us to do
 868    anything to a vforked child before it subsequently calls exec().
 869    On such platforms, we say that the debugger cannot "follow" the
 870    child until it has vforked.
 871
 872    This function should be defined to return 1 by those targets
 873    which can allow the debugger to immediately follow a vforked
 874    child, and 0 if they cannot.  */
 875
 876 #define target_can_follow_vfork_prior_to_exec() \
 877      (*current_target.to_can_follow_vfork_prior_to_exec) ()
 878
 879 /* An inferior process has been created via a vfork() system call.
 880    The debugger has followed the parent, the child, or both.  The
 881    process of setting up for that follow may have required some
 882    target-specific trickery to track the sequence of reported events.
 883    If so, this function should be defined by those targets that
 884    require the debugger to perform cleanup or initialization after
 885    the vfork follow.  */
 886
 887 #define target_post_follow_vfork(parent_pid,followed_parent,child_pid,followed_child) \
 888      (*current_target.to_post_follow_vfork) (parent_pid,followed_parent,child_pid,followed_child)
 889
 890 /* On some targets, we can catch an inferior exec event when it
 891    occurs.  These functions insert/remove an already-created
 892    catchpoint for such events.  */
 893
 894 #define target_insert_exec_catchpoint(pid) \
 895      (*current_target.to_insert_exec_catchpoint) (pid)
 896
 897 #define target_remove_exec_catchpoint(pid) \
 898      (*current_target.to_remove_exec_catchpoint) (pid)
 899
 900 /* Returns TRUE if PID has invoked a flavor of the exec() system call.
 901    And, also sets EXECD_PATHNAME to the pathname of the executable
 902    file that was passed to exec(), and is now being executed.  */
 903
 904 #define target_has_execd(pid,execd_pathname) \
 905      (*current_target.to_has_execd) (pid,execd_pathname)
 906
 907 /* Returns the number of exec events that are reported when a process
 908    invokes a flavor of the exec() system call on this target, if exec
 909    events are being reported.  */
 910
 911 #define target_reported_exec_events_per_exec_call() \
 912      (*current_target.to_reported_exec_events_per_exec_call) ()
 913
 914 /* Returns TRUE if PID has reported a syscall event.  And, also sets
 915    KIND to the appropriate TARGET_WAITKIND_, and sets SYSCALL_ID to
 916    the unique integer ID of the syscall.  */
 917
 918 #define target_has_syscall_event(pid,kind,syscall_id) \
 919      (*current_target.to_has_syscall_event) (pid,kind,syscall_id)
 920
 921 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 922    exit code of PID, if any.  */
 923
 924 #define target_has_exited(pid,wait_status,exit_status) \
 925      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 926
 927 /* The debugger has completed a blocking wait() call.  There is now
 928    some process event that must be processed.  This function should
 929    be defined by those targets that require the debugger to perform
 930    cleanup or internal state changes in response to the process event.  */
 931
 932 /* The inferior process has died.  Do what is right.  */
 933
 934 #define target_mourn_inferior() \
 935      (*current_target.to_mourn_inferior) ()
 936
 937 /* Does target have enough data to do a run or attach command? */
 938
 939 #define target_can_run(t) \
 940      ((t)->to_can_run) ()
 941
 942 /* post process changes to signal handling in the inferior.  */
 943
 944 #define target_notice_signals(pid) \
 945      (*current_target.to_notice_signals) (pid)
 946
 947 /* Check to see if a thread is still alive.  */
 948
 949 #define target_thread_alive(pid) \
 950      (*current_target.to_thread_alive) (pid)
 951
 952 /* Query for new threads and add them to the thread list.  */
 953
 954 #define target_find_new_threads() \
 955      (*current_target.to_find_new_threads) (); \
 956
 957 /* Make target stop in a continuable fashion.  (For instance, under
 958    Unix, this should act like SIGSTOP).  This function is normally
 959    used by GUIs to implement a stop button.  */
 960
 961 #define target_stop current_target.to_stop
 962
 963 /* Queries the target side for some information.  The first argument is a
 964    letter specifying the type of the query, which is used to determine who
 965    should process it.  The second argument is a string that specifies which
 966    information is desired and the third is a buffer that carries back the
 967    response from the target side. The fourth parameter is the size of the
 968    output buffer supplied.  */
 969
 970 #define target_query(query_type, query, resp_buffer, bufffer_size)      \
 971      (*current_target.to_query) (query_type, query, resp_buffer, bufffer_size)
 972
 973 /* Send the specified COMMAND to the target's monitor
 974    (shell,interpreter) for execution.  The result of the query is
 975    placed in OUTBUF.  */
 976
 977 #define target_rcmd(command, outbuf) \
 978      (*current_target.to_rcmd) (command, outbuf)
 979
 980
 981 /* Get the symbol information for a breakpointable routine called when
 982    an exception event occurs.
 983    Intended mainly for C++, and for those
 984    platforms/implementations where such a callback mechanism is available,
 985    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 986    different mechanisms for debugging exceptions.  */
 987
 988 #define target_enable_exception_callback(kind, enable) \
 989      (*current_target.to_enable_exception_callback) (kind, enable)
 990
 991 /* Get the current exception event kind -- throw or catch, etc.  */
 992
 993 #define target_get_current_exception_event() \
 994      (*current_target.to_get_current_exception_event) ()
 995
 996 /* Pointer to next target in the chain, e.g. a core file and an exec file.  */
 997
 998 #define target_next \
 999      (current_target.to_next)
1000
1001 /* Does the target include all of memory, or only part of it?  This
1002    determines whether we look up the target chain for other parts of
1003    memory if this target can't satisfy a request.  */
1004
1005 #define target_has_all_memory   \
1006      (current_target.to_has_all_memory)
1007
1008 /* Does the target include memory?  (Dummy targets don't.)  */
1009
1010 #define target_has_memory       \
1011      (current_target.to_has_memory)
1012
1013 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
1014    we start a process.)  */
1015
1016 #define target_has_stack        \
1017      (current_target.to_has_stack)
1018
1019 /* Does the target have registers?  (Exec files don't.)  */
1020
1021 #define target_has_registers    \
1022      (current_target.to_has_registers)
1023
1024 /* Does the target have execution?  Can we make it jump (through
1025    hoops), or pop its stack a few times?  FIXME: If this is to work that
1026    way, it needs to check whether an inferior actually exists.
1027    remote-udi.c and probably other targets can be the current target
1028    when the inferior doesn't actually exist at the moment.  Right now
1029    this just tells us whether this target is *capable* of execution.  */
1030
1031 #define target_has_execution    \
1032      (current_target.to_has_execution)
1033
1034 /* Can the target support the debugger control of thread execution?
1035    a) Can it lock the thread scheduler?
1036    b) Can it switch the currently running thread?  */
1037
1038 #define target_can_lock_scheduler \
1039      (current_target.to_has_thread_control & tc_schedlock)
1040
1041 #define target_can_switch_threads \
1042      (current_target.to_has_thread_control & tc_switch)
1043
1044 /* Can the target support asynchronous execution? */
1045 #define target_can_async_p() (current_target.to_can_async_p ())
1046
1047 /* Is the target in asynchronous execution mode? */
1048 #define target_is_async_p() (current_target.to_is_async_p())
1049
1050 /* Put the target in async mode with the specified callback function. */
1051 #define target_async(CALLBACK,CONTEXT) \
1052      (current_target.to_async((CALLBACK), (CONTEXT)))
1053
1054 /* This is to be used ONLY within run_stack_dummy(). It
1055    provides a workaround, to have inferior function calls done in
1056    sychronous mode, even though the target is asynchronous. After
1057    target_async_mask(0) is called, calls to target_can_async_p() will
1058    return FALSE , so that target_resume() will not try to start the
1059    target asynchronously. After the inferior stops, we IMMEDIATELY
1060    restore the previous nature of the target, by calling
1061    target_async_mask(1). After that, target_can_async_p() will return
1062    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
1063
1064    FIXME ezannoni 1999-12-13: we won't need this once we move
1065    the turning async on and off to the single execution commands,
1066    from where it is done currently, in remote_resume().  */
1067
1068 #define target_async_mask_value \
1069      (current_target.to_async_mask_value)
1070
1071 extern int target_async_mask (int mask);
1072
1073 extern void target_link (char *, CORE_ADDR *);
1074
1075 /* Converts a process id to a string.  Usually, the string just contains
1076    `process xyz', but on some systems it may contain
1077    `process xyz thread abc'.  */
1078
1079 #undef target_pid_to_str
1080 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
1081
1082 #ifndef target_tid_to_str
1083 #define target_tid_to_str(PID) \
1084      target_pid_to_str (PID)
1085 extern char *normal_pid_to_str (int pid);
1086 #endif
1087
1088 /* Return a short string describing extra information about PID,
1089    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
1090    is okay.  */
1091
1092 #define target_extra_thread_info(TP) \
1093      (current_target.to_extra_thread_info (TP))
1094
1095 /*
1096  * New Objfile Event Hook:
1097  *
1098  * Sometimes a GDB component wants to get notified whenever a new
1099  * objfile is loaded.  Mainly this is used by thread-debugging
1100  * implementations that need to know when symbols for the target
1101  * thread implemenation are available.
1102  *
1103  * The old way of doing this is to define a macro 'target_new_objfile'
1104  * that points to the function that you want to be called on every
1105  * objfile/shlib load.
1106  *
1107  * The new way is to grab the function pointer, 'target_new_objfile_hook',
1108  * and point it to the function that you want to be called on every
1109  * objfile/shlib load.
1110  *
1111  * If multiple clients are willing to be cooperative, they can each
1112  * save a pointer to the previous value of target_new_objfile_hook
1113  * before modifying it, and arrange for their function to call the
1114  * previous function in the chain.  In that way, multiple clients
1115  * can receive this notification (something like with signal handlers).
1116  */
1117
1118 extern void (*target_new_objfile_hook) (struct objfile *);
1119
1120 #ifndef target_pid_or_tid_to_str
1121 #define target_pid_or_tid_to_str(ID) \
1122      target_pid_to_str (ID)
1123 #endif
1124
1125 /* Attempts to find the pathname of the executable file
1126    that was run to create a specified process.
1127
1128    The process PID must be stopped when this operation is used.
1129
1130    If the executable file cannot be determined, NULL is returned.
1131
1132    Else, a pointer to a character string containing the pathname
1133    is returned.  This string should be copied into a buffer by
1134    the client if the string will not be immediately used, or if
1135    it must persist.  */
1136
1137 #define target_pid_to_exec_file(pid) \
1138      (current_target.to_pid_to_exec_file) (pid)
1139
1140 /* Hook to call target-dependent code after reading in a new symbol table.  */
1141
1142 #ifndef TARGET_SYMFILE_POSTREAD
1143 #define TARGET_SYMFILE_POSTREAD(OBJFILE)
1144 #endif
1145
1146 /* Hook to call target dependent code just after inferior target process has
1147    started.  */
1148
1149 #ifndef TARGET_CREATE_INFERIOR_HOOK
1150 #define TARGET_CREATE_INFERIOR_HOOK(PID)
1151 #endif
1152
1153 /* Hardware watchpoint interfaces.  */
1154
1155 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1156    write).  */
1157
1158 #ifndef STOPPED_BY_WATCHPOINT
1159 #define STOPPED_BY_WATCHPOINT(w) 0
1160 #endif
1161
1162 /* HP-UX supplies these operations, which respectively disable and enable
1163    the memory page-protections that are used to implement hardware watchpoints
1164    on that platform.  See wait_for_inferior's use of these.  */
1165
1166 #if !defined(TARGET_DISABLE_HW_WATCHPOINTS)
1167 #define TARGET_DISABLE_HW_WATCHPOINTS(pid)
1168 #endif
1169
1170 #if !defined(TARGET_ENABLE_HW_WATCHPOINTS)
1171 #define TARGET_ENABLE_HW_WATCHPOINTS(pid)
1172 #endif
1173
1174 /* Provide defaults for systems that don't support hardware watchpoints.  */
1175
1176 #ifndef TARGET_HAS_HARDWARE_WATCHPOINTS
1177
1178 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1179    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1180    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1181    (including this one?).  OTHERTYPE is who knows what...  */
1182
1183 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) 0
1184
1185 #if !defined(TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT)
1186 #define TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT(byte_count) \
1187      ((LONGEST)(byte_count) <= REGISTER_SIZE)
1188 #endif
1189
1190 /* However, some addresses may not be profitable to use hardware to watch,
1191    or may be difficult to understand when the addressed object is out of
1192    scope, and hence should be unwatched.  On some targets, this may have
1193    severe performance penalties, such that we might as well use regular
1194    watchpoints, and save (possibly precious) hardware watchpoints for other
1195    locations.  */
1196
1197 #if !defined(TARGET_RANGE_PROFITABLE_FOR_HW_WATCHPOINT)
1198 #define TARGET_RANGE_PROFITABLE_FOR_HW_WATCHPOINT(pid,start,len) 0
1199 #endif
1200
1201
1202 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1203    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1204    success, non-zero for failure.  */
1205
1206 #define target_remove_watchpoint(ADDR,LEN,TYPE) -1
1207 #define target_insert_watchpoint(ADDR,LEN,TYPE) -1
1208
1209 #endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */
1210
1211 #ifndef target_insert_hw_breakpoint
1212 #define target_remove_hw_breakpoint(ADDR,SHADOW) -1
1213 #define target_insert_hw_breakpoint(ADDR,SHADOW) -1
1214 #endif
1215
1216 #ifndef target_stopped_data_address
1217 #define target_stopped_data_address() 0
1218 #endif
1219
1220 /* If defined, then we need to decr pc by this much after a hardware break-
1221    point.  Presumably this overrides DECR_PC_AFTER_BREAK...  */
1222
1223 #ifndef DECR_PC_AFTER_HW_BREAK
1224 #define DECR_PC_AFTER_HW_BREAK 0
1225 #endif
1226
1227 /* Sometimes gdb may pick up what appears to be a valid target address
1228    from a minimal symbol, but the value really means, essentially,
1229    "This is an index into a table which is populated when the inferior
1230    is run.  Therefore, do not attempt to use this as a PC."  */
1231
1232 #if !defined(PC_REQUIRES_RUN_BEFORE_USE)
1233 #define PC_REQUIRES_RUN_BEFORE_USE(pc) (0)
1234 #endif
1235
1236 /* This will only be defined by a target that supports catching vfork events,
1237    such as HP-UX.
1238
1239    On some targets (such as HP-UX 10.20 and earlier), resuming a newly vforked
1240    child process after it has exec'd, causes the parent process to resume as
1241    well.  To prevent the parent from running spontaneously, such targets should
1242    define this to a function that prevents that from happening.  */
1243 #if !defined(ENSURE_VFORKING_PARENT_REMAINS_STOPPED)
1244 #define ENSURE_VFORKING_PARENT_REMAINS_STOPPED(PID) (0)
1245 #endif
1246
1247 /* This will only be defined by a target that supports catching vfork events,
1248    such as HP-UX.
1249
1250    On some targets (such as HP-UX 10.20 and earlier), a newly vforked child
1251    process must be resumed when it delivers its exec event, before the parent
1252    vfork event will be delivered to us.  */
1253
1254 #if !defined(RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK)
1255 #define RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK() (0)
1256 #endif
1257
1258 /* Routines for maintenance of the target structures...
1259
1260    add_target:   Add a target to the list of all possible targets.
1261
1262    push_target:  Make this target the top of the stack of currently used
1263    targets, within its particular stratum of the stack.  Result
1264    is 0 if now atop the stack, nonzero if not on top (maybe
1265    should warn user).
1266
1267    unpush_target: Remove this from the stack of currently used targets,
1268    no matter where it is on the list.  Returns 0 if no
1269    change, 1 if removed from stack.
1270
1271    pop_target:   Remove the top thing on the stack of current targets.  */
1272
1273 extern void add_target (struct target_ops *);
1274
1275 extern int push_target (struct target_ops *);
1276
1277 extern int unpush_target (struct target_ops *);
1278
1279 extern void target_preopen (int);
1280
1281 extern void pop_target (void);
1282
1283 /* Struct section_table maps address ranges to file sections.  It is
1284    mostly used with BFD files, but can be used without (e.g. for handling
1285    raw disks, or files not in formats handled by BFD).  */
1286
1287 struct section_table
1288   {
1289     CORE_ADDR addr;             /* Lowest address in section */
1290     CORE_ADDR endaddr;          /* 1+highest address in section */
1291
1292     sec_ptr the_bfd_section;
1293
1294     bfd *bfd;                   /* BFD file pointer */
1295   };
1296
1297 /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
1298    Returns 0 if OK, 1 on error.  */
1299
1300 extern int
1301 build_section_table (bfd *, struct section_table **, struct section_table **);
1302
1303 /* From mem-break.c */
1304
1305 extern int memory_remove_breakpoint (CORE_ADDR, char *);
1306
1307 extern int memory_insert_breakpoint (CORE_ADDR, char *);
1308
1309 extern int default_memory_remove_breakpoint (CORE_ADDR, char *);
1310
1311 extern int default_memory_insert_breakpoint (CORE_ADDR, char *);
1312
1313 extern breakpoint_from_pc_fn memory_breakpoint_from_pc;
1314
1315
1316 /* From target.c */
1317
1318 extern void initialize_targets (void);
1319
1320 extern void noprocess (void);
1321
1322 extern void find_default_attach (char *, int);
1323
1324 extern void find_default_require_attach (char *, int);
1325
1326 extern void find_default_require_detach (int, char *, int);
1327
1328 extern void find_default_create_inferior (char *, char *, char **);
1329
1330 extern void find_default_clone_and_follow_inferior (int, int *);
1331
1332 extern struct target_ops *find_run_target (void);
1333
1334 extern struct target_ops *find_core_target (void);
1335
1336 extern struct target_ops *find_target_beneath (struct target_ops *);
1337
1338 extern int
1339 target_resize_to_sections (struct target_ops *target, int num_added);
1340
1341 extern void remove_target_sections (bfd *abfd);
1342
1343 \f
1344 /* Stuff that should be shared among the various remote targets.  */
1345
1346 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1347    information (higher values, more information).  */
1348 extern int remote_debug;
1349
1350 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1351 extern int baud_rate;
1352 /* Timeout limit for response from target. */
1353 extern int remote_timeout;
1354
1355 \f
1356 /* Functions for helping to write a native target.  */
1357
1358 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1359 extern void store_waitstatus (struct target_waitstatus *, int);
1360
1361 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1362    targ_signal SIGNO has an equivalent ``host'' representation.  */
1363 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1364    to the shorter target_signal_p() because it is far less ambigious.
1365    In this context ``target_signal'' refers to GDB's internal
1366    representation of the target's set of signals while ``host signal''
1367    refers to the target operating system's signal.  Confused?  */
1368
1369 extern int target_signal_to_host_p (enum target_signal signo);
1370
1371 /* Convert between host signal numbers and enum target_signal's.
1372    target_signal_to_host() returns 0 and prints a warning() on GDB's
1373    console if SIGNO has no equivalent host representation.  */
1374 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1375    refering to the target operating system's signal numbering.
1376    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1377    gdb_signal'' would probably be better as it is refering to GDB's
1378    internal representation of a target operating system's signal.  */
1379
1380 extern enum target_signal target_signal_from_host (int);
1381 extern int target_signal_to_host (enum target_signal);
1382
1383 /* Convert from a number used in a GDB command to an enum target_signal.  */
1384 extern enum target_signal target_signal_from_command (int);
1385
1386 /* Any target can call this to switch to remote protocol (in remote.c). */
1387 extern void push_remote_target (char *name, int from_tty);
1388 \f
1389 /* Imported from machine dependent code */
1390
1391 #ifndef SOFTWARE_SINGLE_STEP_P
1392 #define SOFTWARE_SINGLE_STEP_P 0
1393 #define SOFTWARE_SINGLE_STEP(sig,bp_p)  \
1394      (internal_error ("SOFTWARE_SINGLE_STEP"), 0)
1395 #endif /* SOFTWARE_SINGLE_STEP_P */
1396
1397 /* Blank target vector entries are initialized to target_ignore. */
1398 void target_ignore (void);
1399
1400 /* Macro for getting target's idea of a frame pointer.
1401    FIXME: GDB's whole scheme for dealing with "frames" and
1402    "frame pointers" needs a serious shakedown.  */
1403 #ifndef TARGET_VIRTUAL_FRAME_POINTER
1404 #define TARGET_VIRTUAL_FRAME_POINTER(ADDR, REGP, OFFP) \
1405    do { *(REGP) = FP_REGNUM; *(OFFP) =  0; } while (0)
1406 #endif /* TARGET_VIRTUAL_FRAME_POINTER */
1407
1408 #endif /* !defined (TARGET_H) */