gdb/target.h

   1 /* Interface between GDB and target environments, including files and processes
   2    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   3    2000, 2001, 2002 Free Software Foundation, Inc.
   4    Contributed by Cygnus Support.  Written by John Gilmore.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #if !defined (TARGET_H)
  24 #define TARGET_H
  25
  26 /* This include file defines the interface between the main part
  27    of the debugger, and the part which is target-specific, or
  28    specific to the communications interface between us and the
  29    target.
  30
  31    A TARGET is an interface between the debugger and a particular
  32    kind of file or process.  Targets can be STACKED in STRATA,
  33    so that more than one target can potentially respond to a request.
  34    In particular, memory accesses will walk down the stack of targets
  35    until they find a target that is interested in handling that particular
  36    address.  STRATA are artificial boundaries on the stack, within
  37    which particular kinds of targets live.  Strata exist so that
  38    people don't get confused by pushing e.g. a process target and then
  39    a file target, and wondering why they can't see the current values
  40    of variables any more (the file target is handling them and they
  41    never get to the process target).  So when you push a file target,
  42    it goes into the file stratum, which is always below the process
  43    stratum.  */
  44
  45 #include "bfd.h"
  46 #include "symtab.h"
  47 #include "dcache.h"
  48 #include "memattr.h"
  49
  50 enum strata
  51   {
  52     dummy_stratum,              /* The lowest of the low */
  53     file_stratum,               /* Executable files, etc */
  54     core_stratum,               /* Core dump files */
  55     download_stratum,           /* Downloading of remote targets */
  56     process_stratum,            /* Executing processes */
  57     thread_stratum              /* Executing threads */
  58   };
  59
  60 enum thread_control_capabilities
  61   {
  62     tc_none = 0,                /* Default: can't control thread execution.  */
  63     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  64     tc_switch = 2               /* Can switch the running thread on demand.  */
  65   };
  66
  67 /* Stuff for target_wait.  */
  68
  69 /* Generally, what has the program done?  */
  70 enum target_waitkind
  71   {
  72     /* The program has exited.  The exit status is in value.integer.  */
  73     TARGET_WAITKIND_EXITED,
  74
  75     /* The program has stopped with a signal.  Which signal is in
  76        value.sig.  */
  77     TARGET_WAITKIND_STOPPED,
  78
  79     /* The program has terminated with a signal.  Which signal is in
  80        value.sig.  */
  81     TARGET_WAITKIND_SIGNALLED,
  82
  83     /* The program is letting us know that it dynamically loaded something
  84        (e.g. it called load(2) on AIX).  */
  85     TARGET_WAITKIND_LOADED,
  86
  87     /* The program has forked.  A "related" process' ID is in
  88        value.related_pid.  I.e., if the child forks, value.related_pid
  89        is the parent's ID.  */
  90
  91     TARGET_WAITKIND_FORKED,
  92
  93     /* The program has vforked.  A "related" process's ID is in
  94        value.related_pid.  */
  95
  96     TARGET_WAITKIND_VFORKED,
  97
  98     /* The program has exec'ed a new executable file.  The new file's
  99        pathname is pointed to by value.execd_pathname.  */
 100
 101     TARGET_WAITKIND_EXECD,
 102
 103     /* The program has entered or returned from a system call.  On
 104        HP-UX, this is used in the hardware watchpoint implementation.
 105        The syscall's unique integer ID number is in value.syscall_id */
 106
 107     TARGET_WAITKIND_SYSCALL_ENTRY,
 108     TARGET_WAITKIND_SYSCALL_RETURN,
 109
 110     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 111        within target_wait, but I'm not sure target_wait should be resuming the
 112        inferior.  */
 113     TARGET_WAITKIND_SPURIOUS,
 114
 115     /* This is used for target async and extended-async
 116        only. Remote_async_wait() returns this when there is an event
 117        on the inferior, but the rest of the world is not interested in
 118        it. The inferior has not stopped, but has just sent some output
 119        to the console, for instance. In this case, we want to go back
 120        to the event loop and wait there for another event from the
 121        inferior, rather than being stuck in the remote_async_wait()
 122        function. This way the event loop is responsive to other events,
 123        like for instance the user typing.  */
 124     TARGET_WAITKIND_IGNORE
 125   };
 126
 127 struct target_waitstatus
 128   {
 129     enum target_waitkind kind;
 130
 131     /* Forked child pid, execd pathname, exit status or signal number.  */
 132     union
 133       {
 134         int integer;
 135         enum target_signal sig;
 136         int related_pid;
 137         char *execd_pathname;
 138         int syscall_id;
 139       }
 140     value;
 141   };
 142
 143 /* Possible types of events that the inferior handler will have to
 144    deal with.  */
 145 enum inferior_event_type
 146   {
 147     /* There is a request to quit the inferior, abandon it.  */
 148     INF_QUIT_REQ,
 149     /* Process a normal inferior event which will result in target_wait
 150        being called.  */
 151     INF_REG_EVENT,
 152     /* Deal with an error on the inferior.  */
 153     INF_ERROR,
 154     /* We are called because a timer went off.  */
 155     INF_TIMER,
 156     /* We are called to do stuff after the inferior stops.  */
 157     INF_EXEC_COMPLETE,
 158     /* We are called to do some stuff after the inferior stops, but we
 159        are expected to reenter the proceed() and
 160        handle_inferior_event() functions. This is used only in case of
 161        'step n' like commands.  */
 162     INF_EXEC_CONTINUE
 163   };
 164
 165 /* Return the string for a signal.  */
 166 extern char *target_signal_to_string (enum target_signal);
 167
 168 /* Return the name (SIGHUP, etc.) for a signal.  */
 169 extern char *target_signal_to_name (enum target_signal);
 170
 171 /* Given a name (SIGHUP, etc.), return its signal.  */
 172 enum target_signal target_signal_from_name (char *);
 173 \f
 174
 175 /* If certain kinds of activity happen, target_wait should perform
 176    callbacks.  */
 177 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 178    on TARGET_ACTIVITY_FD.  */
 179 extern int target_activity_fd;
 180 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 181 extern int (*target_activity_function) (void);
 182 \f
 183 struct thread_info;             /* fwd decl for parameter list below: */
 184
 185 struct target_ops
 186   {
 187     char *to_shortname;         /* Name this target type */
 188     char *to_longname;          /* Name for printing */
 189     char *to_doc;               /* Documentation.  Does not include trailing
 190                                    newline, and starts with a one-line descrip-
 191                                    tion (probably similar to to_longname).  */
 192     void (*to_open) (char *, int);
 193     void (*to_close) (int);
 194     void (*to_attach) (char *, int);
 195     void (*to_post_attach) (int);
 196     void (*to_require_attach) (char *, int);
 197     void (*to_detach) (char *, int);
 198     void (*to_require_detach) (int, char *, int);
 199     void (*to_resume) (ptid_t, int, enum target_signal);
 200     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 201     void (*to_post_wait) (ptid_t, int);
 202     void (*to_fetch_registers) (int);
 203     void (*to_store_registers) (int);
 204     void (*to_prepare_to_store) (void);
 205
 206     /* Transfer LEN bytes of memory between GDB address MYADDR and
 207        target address MEMADDR.  If WRITE, transfer them to the target, else
 208        transfer them from the target.  TARGET is the target from which we
 209        get this function.
 210
 211        Return value, N, is one of the following:
 212
 213        0 means that we can't handle this.  If errno has been set, it is the
 214        error which prevented us from doing it (FIXME: What about bfd_error?).
 215
 216        positive (call it N) means that we have transferred N bytes
 217        starting at MEMADDR.  We might be able to handle more bytes
 218        beyond this length, but no promises.
 219
 220        negative (call its absolute value N) means that we cannot
 221        transfer right at MEMADDR, but we could transfer at least
 222        something at MEMADDR + N.  */
 223
 224     int (*to_xfer_memory) (CORE_ADDR memaddr, char *myaddr,
 225                            int len, int write,
 226                            struct mem_attrib *attrib,
 227                            struct target_ops *target);
 228
 229 #if 0
 230     /* Enable this after 4.12.  */
 231
 232     /* Search target memory.  Start at STARTADDR and take LEN bytes of
 233        target memory, and them with MASK, and compare to DATA.  If they
 234        match, set *ADDR_FOUND to the address we found it at, store the data
 235        we found at LEN bytes starting at DATA_FOUND, and return.  If
 236        not, add INCREMENT to the search address and keep trying until
 237        the search address is outside of the range [LORANGE,HIRANGE).
 238
 239        If we don't find anything, set *ADDR_FOUND to (CORE_ADDR)0 and
 240        return.  */
 241
 242     void (*to_search) (int len, char *data, char *mask,
 243                        CORE_ADDR startaddr, int increment,
 244                        CORE_ADDR lorange, CORE_ADDR hirange,
 245                        CORE_ADDR * addr_found, char *data_found);
 246
 247 #define target_search(len, data, mask, startaddr, increment, lorange, hirange, addr_found, data_found)  \
 248     (*current_target.to_search) (len, data, mask, startaddr, increment, \
 249                                  lorange, hirange, addr_found, data_found)
 250 #endif                          /* 0 */
 251
 252     void (*to_files_info) (struct target_ops *);
 253     int (*to_insert_breakpoint) (CORE_ADDR, char *);
 254     int (*to_remove_breakpoint) (CORE_ADDR, char *);
 255     int (*to_can_use_hw_breakpoint) (int, int, int);
 256     int (*to_insert_hw_breakpoint) (CORE_ADDR, char *);
 257     int (*to_remove_hw_breakpoint) (CORE_ADDR, char *);
 258     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 259     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 260     int (*to_stopped_by_watchpoint) (void);
 261     CORE_ADDR (*to_stopped_data_address) (void);
 262     int (*to_region_size_ok_for_hw_watchpoint) (int);
 263     void (*to_terminal_init) (void);
 264     void (*to_terminal_inferior) (void);
 265     void (*to_terminal_ours_for_output) (void);
 266     void (*to_terminal_ours) (void);
 267     void (*to_terminal_save_ours) (void);
 268     void (*to_terminal_info) (char *, int);
 269     void (*to_kill) (void);
 270     void (*to_load) (char *, int);
 271     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 272     void (*to_create_inferior) (char *, char *, char **);
 273     void (*to_post_startup_inferior) (ptid_t);
 274     void (*to_acknowledge_created_inferior) (int);
 275     void (*to_clone_and_follow_inferior) (int, int *);
 276     void (*to_post_follow_inferior_by_clone) (void);
 277     int (*to_insert_fork_catchpoint) (int);
 278     int (*to_remove_fork_catchpoint) (int);
 279     int (*to_insert_vfork_catchpoint) (int);
 280     int (*to_remove_vfork_catchpoint) (int);
 281     int (*to_has_forked) (int, int *);
 282     int (*to_has_vforked) (int, int *);
 283     int (*to_can_follow_vfork_prior_to_exec) (void);
 284     void (*to_post_follow_vfork) (int, int, int, int);
 285     int (*to_insert_exec_catchpoint) (int);
 286     int (*to_remove_exec_catchpoint) (int);
 287     int (*to_has_execd) (int, char **);
 288     int (*to_reported_exec_events_per_exec_call) (void);
 289     int (*to_has_syscall_event) (int, enum target_waitkind *, int *);
 290     int (*to_has_exited) (int, int, int *);
 291     void (*to_mourn_inferior) (void);
 292     int (*to_can_run) (void);
 293     void (*to_notice_signals) (ptid_t ptid);
 294     int (*to_thread_alive) (ptid_t ptid);
 295     void (*to_find_new_threads) (void);
 296     char *(*to_pid_to_str) (ptid_t);
 297     char *(*to_extra_thread_info) (struct thread_info *);
 298     void (*to_stop) (void);
 299     int (*to_query) (int /*char */ , char *, char *, int *);
 300     void (*to_rcmd) (char *command, struct ui_file *output);
 301     struct symtab_and_line *(*to_enable_exception_callback) (enum
 302                                                              exception_event_kind,
 303                                                              int);
 304     struct exception_event_record *(*to_get_current_exception_event) (void);
 305     char *(*to_pid_to_exec_file) (int pid);
 306     enum strata to_stratum;
 307     struct target_ops
 308      *DONT_USE;                 /* formerly to_next */
 309     int to_has_all_memory;
 310     int to_has_memory;
 311     int to_has_stack;
 312     int to_has_registers;
 313     int to_has_execution;
 314     int to_has_thread_control;  /* control thread execution */
 315     struct section_table
 316      *to_sections;
 317     struct section_table
 318      *to_sections_end;
 319     /* ASYNC target controls */
 320     int (*to_can_async_p) (void);
 321     int (*to_is_async_p) (void);
 322     void (*to_async) (void (*cb) (enum inferior_event_type, void *context),
 323                       void *context);
 324     int to_async_mask_value;
 325     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 326                                             unsigned long,
 327                                             int, int, int,
 328                                             void *),
 329                                    void *);
 330     char * (*to_make_corefile_notes) (bfd *, int *);
 331     int to_magic;
 332     /* Need sub-structure for target machine related rather than comm related?
 333      */
 334   };
 335
 336 /* Magic number for checking ops size.  If a struct doesn't end with this
 337    number, somebody changed the declaration but didn't change all the
 338    places that initialize one.  */
 339
 340 #define OPS_MAGIC       3840
 341
 342 /* The ops structure for our "current" target process.  This should
 343    never be NULL.  If there is no target, it points to the dummy_target.  */
 344
 345 extern struct target_ops current_target;
 346
 347 /* An item on the target stack.  */
 348
 349 struct target_stack_item
 350   {
 351     struct target_stack_item *next;
 352     struct target_ops *target_ops;
 353   };
 354
 355 /* The target stack.  */
 356
 357 extern struct target_stack_item *target_stack;
 358
 359 /* Define easy words for doing these operations on our current target.  */
 360
 361 #define target_shortname        (current_target.to_shortname)
 362 #define target_longname         (current_target.to_longname)
 363
 364 /* The open routine takes the rest of the parameters from the command,
 365    and (if successful) pushes a new target onto the stack.
 366    Targets should supply this routine, if only to provide an error message.  */
 367
 368 #define target_open(name, from_tty)                                     \
 369   do {                                                                  \
 370     dcache_invalidate (target_dcache);                                  \
 371     (*current_target.to_open) (name, from_tty);                         \
 372   } while (0)
 373
 374 /* Does whatever cleanup is required for a target that we are no longer
 375    going to be calling.  Argument says whether we are quitting gdb and
 376    should not get hung in case of errors, or whether we want a clean
 377    termination even if it takes a while.  This routine is automatically
 378    always called just before a routine is popped off the target stack.
 379    Closing file descriptors and freeing memory are typical things it should
 380    do.  */
 381
 382 #define target_close(quitting)  \
 383      (*current_target.to_close) (quitting)
 384
 385 /* Attaches to a process on the target side.  Arguments are as passed
 386    to the `attach' command by the user.  This routine can be called
 387    when the target is not on the target-stack, if the target_can_run
 388    routine returns 1; in that case, it must push itself onto the stack.
 389    Upon exit, the target should be ready for normal operations, and
 390    should be ready to deliver the status of the process immediately
 391    (without waiting) to an upcoming target_wait call.  */
 392
 393 #define target_attach(args, from_tty)   \
 394      (*current_target.to_attach) (args, from_tty)
 395
 396 /* The target_attach operation places a process under debugger control,
 397    and stops the process.
 398
 399    This operation provides a target-specific hook that allows the
 400    necessary bookkeeping to be performed after an attach completes.  */
 401 #define target_post_attach(pid) \
 402      (*current_target.to_post_attach) (pid)
 403
 404 /* Attaches to a process on the target side, if not already attached.
 405    (If already attached, takes no action.)
 406
 407    This operation can be used to follow the child process of a fork.
 408    On some targets, such child processes of an original inferior process
 409    are automatically under debugger control, and thus do not require an
 410    actual attach operation.  */
 411
 412 #define target_require_attach(args, from_tty)   \
 413      (*current_target.to_require_attach) (args, from_tty)
 414
 415 /* Takes a program previously attached to and detaches it.
 416    The program may resume execution (some targets do, some don't) and will
 417    no longer stop on signals, etc.  We better not have left any breakpoints
 418    in the program or it'll die when it hits one.  ARGS is arguments
 419    typed by the user (e.g. a signal to send the process).  FROM_TTY
 420    says whether to be verbose or not.  */
 421
 422 extern void target_detach (char *, int);
 423
 424 /* Detaches from a process on the target side, if not already dettached.
 425    (If already detached, takes no action.)
 426
 427    This operation can be used to follow the parent process of a fork.
 428    On some targets, such child processes of an original inferior process
 429    are automatically under debugger control, and thus do require an actual
 430    detach operation.
 431
 432    PID is the process id of the child to detach from.
 433    ARGS is arguments typed by the user (e.g. a signal to send the process).
 434    FROM_TTY says whether to be verbose or not.  */
 435
 436 #define target_require_detach(pid, args, from_tty)      \
 437      (*current_target.to_require_detach) (pid, args, from_tty)
 438
 439 /* Resume execution of the target process PTID.  STEP says whether to
 440    single-step or to run free; SIGGNAL is the signal to be given to
 441    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 442    pass TARGET_SIGNAL_DEFAULT.  */
 443
 444 #define target_resume(ptid, step, siggnal)                              \
 445   do {                                                                  \
 446     dcache_invalidate(target_dcache);                                   \
 447     (*current_target.to_resume) (ptid, step, siggnal);                  \
 448   } while (0)
 449
 450 /* Wait for process pid to do something.  PTID = -1 to wait for any
 451    pid to do something.  Return pid of child, or -1 in case of error;
 452    store status through argument pointer STATUS.  Note that it is
 453    _NOT_ OK to throw_exception() out of target_wait() without popping
 454    the debugging target from the stack; GDB isn't prepared to get back
 455    to the prompt with a debugging target but without the frame cache,
 456    stop_pc, etc., set up.  */
 457
 458 #define target_wait(ptid, status)               \
 459      (*current_target.to_wait) (ptid, status)
 460
 461 /* The target_wait operation waits for a process event to occur, and
 462    thereby stop the process.
 463
 464    On some targets, certain events may happen in sequences.  gdb's
 465    correct response to any single event of such a sequence may require
 466    knowledge of what earlier events in the sequence have been seen.
 467
 468    This operation provides a target-specific hook that allows the
 469    necessary bookkeeping to be performed to track such sequences.  */
 470
 471 #define target_post_wait(ptid, status) \
 472      (*current_target.to_post_wait) (ptid, status)
 473
 474 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 475
 476 #define target_fetch_registers(regno)   \
 477      (*current_target.to_fetch_registers) (regno)
 478
 479 /* Store at least register REGNO, or all regs if REGNO == -1.
 480    It can store as many registers as it wants to, so target_prepare_to_store
 481    must have been previously called.  Calls error() if there are problems.  */
 482
 483 #define target_store_registers(regs)    \
 484      (*current_target.to_store_registers) (regs)
 485
 486 /* Get ready to modify the registers array.  On machines which store
 487    individual registers, this doesn't need to do anything.  On machines
 488    which store all the registers in one fell swoop, this makes sure
 489    that REGISTERS contains all the registers from the program being
 490    debugged.  */
 491
 492 #define target_prepare_to_store()       \
 493      (*current_target.to_prepare_to_store) ()
 494
 495 extern DCACHE *target_dcache;
 496
 497 extern int do_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
 498                            struct mem_attrib *attrib);
 499
 500 extern int target_read_string (CORE_ADDR, char **, int, int *);
 501
 502 extern int target_read_memory (CORE_ADDR memaddr, char *myaddr, int len);
 503
 504 extern int target_write_memory (CORE_ADDR memaddr, char *myaddr, int len);
 505
 506 extern int xfer_memory (CORE_ADDR, char *, int, int,
 507                         struct mem_attrib *, struct target_ops *);
 508
 509 extern int child_xfer_memory (CORE_ADDR, char *, int, int,
 510                               struct mem_attrib *, struct target_ops *);
 511
 512 /* Make a single attempt at transfering LEN bytes.  On a successful
 513    transfer, the number of bytes actually transfered is returned and
 514    ERR is set to 0.  When a transfer fails, -1 is returned (the number
 515    of bytes actually transfered is not defined) and ERR is set to a
 516    non-zero error indication.  */
 517
 518 extern int
 519 target_read_memory_partial (CORE_ADDR addr, char *buf, int len, int *err);
 520
 521 extern int
 522 target_write_memory_partial (CORE_ADDR addr, char *buf, int len, int *err);
 523
 524 extern char *child_pid_to_exec_file (int);
 525
 526 extern char *child_core_file_to_sym_file (char *);
 527
 528 #if defined(CHILD_POST_ATTACH)
 529 extern void child_post_attach (int);
 530 #endif
 531
 532 extern void child_post_wait (ptid_t, int);
 533
 534 extern void child_post_startup_inferior (ptid_t);
 535
 536 extern void child_acknowledge_created_inferior (int);
 537
 538 extern void child_clone_and_follow_inferior (int, int *);
 539
 540 extern void child_post_follow_inferior_by_clone (void);
 541
 542 extern int child_insert_fork_catchpoint (int);
 543
 544 extern int child_remove_fork_catchpoint (int);
 545
 546 extern int child_insert_vfork_catchpoint (int);
 547
 548 extern int child_remove_vfork_catchpoint (int);
 549
 550 extern int child_has_forked (int, int *);
 551
 552 extern int child_has_vforked (int, int *);
 553
 554 extern void child_acknowledge_created_inferior (int);
 555
 556 extern int child_can_follow_vfork_prior_to_exec (void);
 557
 558 extern void child_post_follow_vfork (int, int, int, int);
 559
 560 extern int child_insert_exec_catchpoint (int);
 561
 562 extern int child_remove_exec_catchpoint (int);
 563
 564 extern int child_has_execd (int, char **);
 565
 566 extern int child_reported_exec_events_per_exec_call (void);
 567
 568 extern int child_has_syscall_event (int, enum target_waitkind *, int *);
 569
 570 extern int child_has_exited (int, int, int *);
 571
 572 extern int child_thread_alive (ptid_t);
 573
 574 /* From exec.c */
 575
 576 extern void print_section_info (struct target_ops *, bfd *);
 577
 578 /* Print a line about the current target.  */
 579
 580 #define target_files_info()     \
 581      (*current_target.to_files_info) (&current_target)
 582
 583 /* Insert a breakpoint at address ADDR in the target machine.
 584    SAVE is a pointer to memory allocated for saving the
 585    target contents.  It is guaranteed by the caller to be long enough
 586    to save "sizeof BREAKPOINT" bytes.  Result is 0 for success, or
 587    an errno value.  */
 588
 589 #define target_insert_breakpoint(addr, save)    \
 590      (*current_target.to_insert_breakpoint) (addr, save)
 591
 592 /* Remove a breakpoint at address ADDR in the target machine.
 593    SAVE is a pointer to the same save area
 594    that was previously passed to target_insert_breakpoint.
 595    Result is 0 for success, or an errno value.  */
 596
 597 #define target_remove_breakpoint(addr, save)    \
 598      (*current_target.to_remove_breakpoint) (addr, save)
 599
 600 /* Initialize the terminal settings we record for the inferior,
 601    before we actually run the inferior.  */
 602
 603 #define target_terminal_init() \
 604      (*current_target.to_terminal_init) ()
 605
 606 /* Put the inferior's terminal settings into effect.
 607    This is preparation for starting or resuming the inferior.  */
 608
 609 #define target_terminal_inferior() \
 610      (*current_target.to_terminal_inferior) ()
 611
 612 /* Put some of our terminal settings into effect,
 613    enough to get proper results from our output,
 614    but do not change into or out of RAW mode
 615    so that no input is discarded.
 616
 617    After doing this, either terminal_ours or terminal_inferior
 618    should be called to get back to a normal state of affairs.  */
 619
 620 #define target_terminal_ours_for_output() \
 621      (*current_target.to_terminal_ours_for_output) ()
 622
 623 /* Put our terminal settings into effect.
 624    First record the inferior's terminal settings
 625    so they can be restored properly later.  */
 626
 627 #define target_terminal_ours() \
 628      (*current_target.to_terminal_ours) ()
 629
 630 /* Save our terminal settings.
 631    This is called from TUI after entering or leaving the curses
 632    mode.  Since curses modifies our terminal this call is here
 633    to take this change into account.  */
 634
 635 #define target_terminal_save_ours() \
 636      (*current_target.to_terminal_save_ours) ()
 637
 638 /* Print useful information about our terminal status, if such a thing
 639    exists.  */
 640
 641 #define target_terminal_info(arg, from_tty) \
 642      (*current_target.to_terminal_info) (arg, from_tty)
 643
 644 /* Kill the inferior process.   Make it go away.  */
 645
 646 #define target_kill() \
 647      (*current_target.to_kill) ()
 648
 649 /* Load an executable file into the target process.  This is expected
 650    to not only bring new code into the target process, but also to
 651    update GDB's symbol tables to match.  */
 652
 653 extern void target_load (char *arg, int from_tty);
 654
 655 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 656    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 657    symbol should be returned.  The result is 0 if successful, nonzero
 658    if the symbol does not exist in the target environment.  This
 659    function should not call error() if communication with the target
 660    is interrupted, since it is called from symbol reading, but should
 661    return nonzero, possibly doing a complain().  */
 662
 663 #define target_lookup_symbol(name, addrp) \
 664      (*current_target.to_lookup_symbol) (name, addrp)
 665
 666 /* Start an inferior process and set inferior_ptid to its pid.
 667    EXEC_FILE is the file to run.
 668    ALLARGS is a string containing the arguments to the program.
 669    ENV is the environment vector to pass.  Errors reported with error().
 670    On VxWorks and various standalone systems, we ignore exec_file.  */
 671
 672 #define target_create_inferior(exec_file, args, env)    \
 673      (*current_target.to_create_inferior) (exec_file, args, env)
 674
 675
 676 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 677    notification of inferior events such as fork and vork immediately
 678    after the inferior is created.  (This because of how gdb gets an
 679    inferior created via invoking a shell to do it.  In such a scenario,
 680    if the shell init file has commands in it, the shell will fork and
 681    exec for each of those commands, and we will see each such fork
 682    event.  Very bad.)
 683
 684    Such targets will supply an appropriate definition for this function.  */
 685
 686 #define target_post_startup_inferior(ptid) \
 687      (*current_target.to_post_startup_inferior) (ptid)
 688
 689 /* On some targets, the sequence of starting up an inferior requires
 690    some synchronization between gdb and the new inferior process, PID.  */
 691
 692 #define target_acknowledge_created_inferior(pid) \
 693      (*current_target.to_acknowledge_created_inferior) (pid)
 694
 695 /* An inferior process has been created via a fork() or similar
 696    system call.  This function will clone the debugger, then ensure
 697    that CHILD_PID is attached to by that debugger.
 698
 699    FOLLOWED_CHILD is set TRUE on return *for the clone debugger only*,
 700    and FALSE otherwise.  (The original and clone debuggers can use this
 701    to determine which they are, if need be.)
 702
 703    (This is not a terribly useful feature without a GUI to prevent
 704    the two debuggers from competing for shell input.)  */
 705
 706 #define target_clone_and_follow_inferior(child_pid,followed_child) \
 707      (*current_target.to_clone_and_follow_inferior) (child_pid, followed_child)
 708
 709 /* This operation is intended to be used as the last in a sequence of
 710    steps taken when following both parent and child of a fork.  This
 711    is used by a clone of the debugger, which will follow the child.
 712
 713    The original debugger has detached from this process, and the
 714    clone has attached to it.
 715
 716    On some targets, this requires a bit of cleanup to make it work
 717    correctly.  */
 718
 719 #define target_post_follow_inferior_by_clone() \
 720      (*current_target.to_post_follow_inferior_by_clone) ()
 721
 722 /* On some targets, we can catch an inferior fork or vfork event when
 723    it occurs.  These functions insert/remove an already-created
 724    catchpoint for such events.  */
 725
 726 #define target_insert_fork_catchpoint(pid) \
 727      (*current_target.to_insert_fork_catchpoint) (pid)
 728
 729 #define target_remove_fork_catchpoint(pid) \
 730      (*current_target.to_remove_fork_catchpoint) (pid)
 731
 732 #define target_insert_vfork_catchpoint(pid) \
 733      (*current_target.to_insert_vfork_catchpoint) (pid)
 734
 735 #define target_remove_vfork_catchpoint(pid) \
 736      (*current_target.to_remove_vfork_catchpoint) (pid)
 737
 738 /* Returns TRUE if PID has invoked the fork() system call.  And,
 739    also sets CHILD_PID to the process id of the other ("child")
 740    inferior process that was created by that call.  */
 741
 742 #define target_has_forked(pid,child_pid) \
 743      (*current_target.to_has_forked) (pid,child_pid)
 744
 745 /* Returns TRUE if PID has invoked the vfork() system call.  And,
 746    also sets CHILD_PID to the process id of the other ("child")
 747    inferior process that was created by that call.  */
 748
 749 #define target_has_vforked(pid,child_pid) \
 750      (*current_target.to_has_vforked) (pid,child_pid)
 751
 752 /* Some platforms (such as pre-10.20 HP-UX) don't allow us to do
 753    anything to a vforked child before it subsequently calls exec().
 754    On such platforms, we say that the debugger cannot "follow" the
 755    child until it has vforked.
 756
 757    This function should be defined to return 1 by those targets
 758    which can allow the debugger to immediately follow a vforked
 759    child, and 0 if they cannot.  */
 760
 761 #define target_can_follow_vfork_prior_to_exec() \
 762      (*current_target.to_can_follow_vfork_prior_to_exec) ()
 763
 764 /* An inferior process has been created via a vfork() system call.
 765    The debugger has followed the parent, the child, or both.  The
 766    process of setting up for that follow may have required some
 767    target-specific trickery to track the sequence of reported events.
 768    If so, this function should be defined by those targets that
 769    require the debugger to perform cleanup or initialization after
 770    the vfork follow.  */
 771
 772 #define target_post_follow_vfork(parent_pid,followed_parent,child_pid,followed_child) \
 773      (*current_target.to_post_follow_vfork) (parent_pid,followed_parent,child_pid,followed_child)
 774
 775 /* On some targets, we can catch an inferior exec event when it
 776    occurs.  These functions insert/remove an already-created
 777    catchpoint for such events.  */
 778
 779 #define target_insert_exec_catchpoint(pid) \
 780      (*current_target.to_insert_exec_catchpoint) (pid)
 781
 782 #define target_remove_exec_catchpoint(pid) \
 783      (*current_target.to_remove_exec_catchpoint) (pid)
 784
 785 /* Returns TRUE if PID has invoked a flavor of the exec() system call.
 786    And, also sets EXECD_PATHNAME to the pathname of the executable
 787    file that was passed to exec(), and is now being executed.  */
 788
 789 #define target_has_execd(pid,execd_pathname) \
 790      (*current_target.to_has_execd) (pid,execd_pathname)
 791
 792 /* Returns the number of exec events that are reported when a process
 793    invokes a flavor of the exec() system call on this target, if exec
 794    events are being reported.  */
 795
 796 #define target_reported_exec_events_per_exec_call() \
 797      (*current_target.to_reported_exec_events_per_exec_call) ()
 798
 799 /* Returns TRUE if PID has reported a syscall event.  And, also sets
 800    KIND to the appropriate TARGET_WAITKIND_, and sets SYSCALL_ID to
 801    the unique integer ID of the syscall.  */
 802
 803 #define target_has_syscall_event(pid,kind,syscall_id) \
 804      (*current_target.to_has_syscall_event) (pid,kind,syscall_id)
 805
 806 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 807    exit code of PID, if any.  */
 808
 809 #define target_has_exited(pid,wait_status,exit_status) \
 810      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 811
 812 /* The debugger has completed a blocking wait() call.  There is now
 813    some process event that must be processed.  This function should
 814    be defined by those targets that require the debugger to perform
 815    cleanup or internal state changes in response to the process event.  */
 816
 817 /* The inferior process has died.  Do what is right.  */
 818
 819 #define target_mourn_inferior() \
 820      (*current_target.to_mourn_inferior) ()
 821
 822 /* Does target have enough data to do a run or attach command? */
 823
 824 #define target_can_run(t) \
 825      ((t)->to_can_run) ()
 826
 827 /* post process changes to signal handling in the inferior.  */
 828
 829 #define target_notice_signals(ptid) \
 830      (*current_target.to_notice_signals) (ptid)
 831
 832 /* Check to see if a thread is still alive.  */
 833
 834 #define target_thread_alive(ptid) \
 835      (*current_target.to_thread_alive) (ptid)
 836
 837 /* Query for new threads and add them to the thread list.  */
 838
 839 #define target_find_new_threads() \
 840      (*current_target.to_find_new_threads) (); \
 841
 842 /* Make target stop in a continuable fashion.  (For instance, under
 843    Unix, this should act like SIGSTOP).  This function is normally
 844    used by GUIs to implement a stop button.  */
 845
 846 #define target_stop current_target.to_stop
 847
 848 /* Queries the target side for some information.  The first argument is a
 849    letter specifying the type of the query, which is used to determine who
 850    should process it.  The second argument is a string that specifies which
 851    information is desired and the third is a buffer that carries back the
 852    response from the target side. The fourth parameter is the size of the
 853    output buffer supplied.  */
 854
 855 #define target_query(query_type, query, resp_buffer, bufffer_size)      \
 856      (*current_target.to_query) (query_type, query, resp_buffer, bufffer_size)
 857
 858 /* Send the specified COMMAND to the target's monitor
 859    (shell,interpreter) for execution.  The result of the query is
 860    placed in OUTBUF.  */
 861
 862 #define target_rcmd(command, outbuf) \
 863      (*current_target.to_rcmd) (command, outbuf)
 864
 865
 866 /* Get the symbol information for a breakpointable routine called when
 867    an exception event occurs.
 868    Intended mainly for C++, and for those
 869    platforms/implementations where such a callback mechanism is available,
 870    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 871    different mechanisms for debugging exceptions.  */
 872
 873 #define target_enable_exception_callback(kind, enable) \
 874      (*current_target.to_enable_exception_callback) (kind, enable)
 875
 876 /* Get the current exception event kind -- throw or catch, etc.  */
 877
 878 #define target_get_current_exception_event() \
 879      (*current_target.to_get_current_exception_event) ()
 880
 881 /* Pointer to next target in the chain, e.g. a core file and an exec file.  */
 882
 883 #define target_next \
 884      (current_target.to_next)
 885
 886 /* Does the target include all of memory, or only part of it?  This
 887    determines whether we look up the target chain for other parts of
 888    memory if this target can't satisfy a request.  */
 889
 890 #define target_has_all_memory   \
 891      (current_target.to_has_all_memory)
 892
 893 /* Does the target include memory?  (Dummy targets don't.)  */
 894
 895 #define target_has_memory       \
 896      (current_target.to_has_memory)
 897
 898 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 899    we start a process.)  */
 900
 901 #define target_has_stack        \
 902      (current_target.to_has_stack)
 903
 904 /* Does the target have registers?  (Exec files don't.)  */
 905
 906 #define target_has_registers    \
 907      (current_target.to_has_registers)
 908
 909 /* Does the target have execution?  Can we make it jump (through
 910    hoops), or pop its stack a few times?  FIXME: If this is to work that
 911    way, it needs to check whether an inferior actually exists.
 912    remote-udi.c and probably other targets can be the current target
 913    when the inferior doesn't actually exist at the moment.  Right now
 914    this just tells us whether this target is *capable* of execution.  */
 915
 916 #define target_has_execution    \
 917      (current_target.to_has_execution)
 918
 919 /* Can the target support the debugger control of thread execution?
 920    a) Can it lock the thread scheduler?
 921    b) Can it switch the currently running thread?  */
 922
 923 #define target_can_lock_scheduler \
 924      (current_target.to_has_thread_control & tc_schedlock)
 925
 926 #define target_can_switch_threads \
 927      (current_target.to_has_thread_control & tc_switch)
 928
 929 /* Can the target support asynchronous execution? */
 930 #define target_can_async_p() (current_target.to_can_async_p ())
 931
 932 /* Is the target in asynchronous execution mode? */
 933 #define target_is_async_p() (current_target.to_is_async_p())
 934
 935 /* Put the target in async mode with the specified callback function. */
 936 #define target_async(CALLBACK,CONTEXT) \
 937      (current_target.to_async((CALLBACK), (CONTEXT)))
 938
 939 /* This is to be used ONLY within run_stack_dummy(). It
 940    provides a workaround, to have inferior function calls done in
 941    sychronous mode, even though the target is asynchronous. After
 942    target_async_mask(0) is called, calls to target_can_async_p() will
 943    return FALSE , so that target_resume() will not try to start the
 944    target asynchronously. After the inferior stops, we IMMEDIATELY
 945    restore the previous nature of the target, by calling
 946    target_async_mask(1). After that, target_can_async_p() will return
 947    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 948
 949    FIXME ezannoni 1999-12-13: we won't need this once we move
 950    the turning async on and off to the single execution commands,
 951    from where it is done currently, in remote_resume().  */
 952
 953 #define target_async_mask_value \
 954      (current_target.to_async_mask_value)
 955
 956 extern int target_async_mask (int mask);
 957
 958 extern void target_link (char *, CORE_ADDR *);
 959
 960 /* Converts a process id to a string.  Usually, the string just contains
 961    `process xyz', but on some systems it may contain
 962    `process xyz thread abc'.  */
 963
 964 #undef target_pid_to_str
 965 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
 966
 967 #ifndef target_tid_to_str
 968 #define target_tid_to_str(PID) \
 969      target_pid_to_str (PID)
 970 extern char *normal_pid_to_str (ptid_t ptid);
 971 #endif
 972
 973 /* Return a short string describing extra information about PID,
 974    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
 975    is okay.  */
 976
 977 #define target_extra_thread_info(TP) \
 978      (current_target.to_extra_thread_info (TP))
 979
 980 /*
 981  * New Objfile Event Hook:
 982  *
 983  * Sometimes a GDB component wants to get notified whenever a new
 984  * objfile is loaded.  Mainly this is used by thread-debugging
 985  * implementations that need to know when symbols for the target
 986  * thread implemenation are available.
 987  *
 988  * The old way of doing this is to define a macro 'target_new_objfile'
 989  * that points to the function that you want to be called on every
 990  * objfile/shlib load.
 991  *
 992  * The new way is to grab the function pointer, 'target_new_objfile_hook',
 993  * and point it to the function that you want to be called on every
 994  * objfile/shlib load.
 995  *
 996  * If multiple clients are willing to be cooperative, they can each
 997  * save a pointer to the previous value of target_new_objfile_hook
 998  * before modifying it, and arrange for their function to call the
 999  * previous function in the chain.  In that way, multiple clients
1000  * can receive this notification (something like with signal handlers).
1001  */
1002
1003 extern void (*target_new_objfile_hook) (struct objfile *);
1004
1005 #ifndef target_pid_or_tid_to_str
1006 #define target_pid_or_tid_to_str(ID) \
1007      target_pid_to_str (ID)
1008 #endif
1009
1010 /* Attempts to find the pathname of the executable file
1011    that was run to create a specified process.
1012
1013    The process PID must be stopped when this operation is used.
1014
1015    If the executable file cannot be determined, NULL is returned.
1016
1017    Else, a pointer to a character string containing the pathname
1018    is returned.  This string should be copied into a buffer by
1019    the client if the string will not be immediately used, or if
1020    it must persist.  */
1021
1022 #define target_pid_to_exec_file(pid) \
1023      (current_target.to_pid_to_exec_file) (pid)
1024
1025 /*
1026  * Iterator function for target memory regions.
1027  * Calls a callback function once for each memory region 'mapped'
1028  * in the child process.  Defined as a simple macro rather than
1029  * as a function macro so that it can be tested for nullity.
1030  */
1031
1032 #define target_find_memory_regions(FUNC, DATA) \
1033      (current_target.to_find_memory_regions) (FUNC, DATA)
1034
1035 /*
1036  * Compose corefile .note section.
1037  */
1038
1039 #define target_make_corefile_notes(BFD, SIZE_P) \
1040      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1041
1042 /* Hook to call target-dependent code after reading in a new symbol table.  */
1043
1044 #ifndef TARGET_SYMFILE_POSTREAD
1045 #define TARGET_SYMFILE_POSTREAD(OBJFILE)
1046 #endif
1047
1048 /* Hook to call target dependent code just after inferior target process has
1049    started.  */
1050
1051 #ifndef TARGET_CREATE_INFERIOR_HOOK
1052 #define TARGET_CREATE_INFERIOR_HOOK(PID)
1053 #endif
1054
1055 /* Hardware watchpoint interfaces.  */
1056
1057 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1058    write).  */
1059
1060 #ifndef STOPPED_BY_WATCHPOINT
1061 #define STOPPED_BY_WATCHPOINT(w) \
1062    (*current_target.to_stopped_by_watchpoint) ()
1063 #endif
1064
1065 /* HP-UX supplies these operations, which respectively disable and enable
1066    the memory page-protections that are used to implement hardware watchpoints
1067    on that platform.  See wait_for_inferior's use of these.  */
1068
1069 #if !defined(TARGET_DISABLE_HW_WATCHPOINTS)
1070 #define TARGET_DISABLE_HW_WATCHPOINTS(pid)
1071 #endif
1072
1073 #if !defined(TARGET_ENABLE_HW_WATCHPOINTS)
1074 #define TARGET_ENABLE_HW_WATCHPOINTS(pid)
1075 #endif
1076
1077 /* Provide defaults for hardware watchpoint functions.  */
1078
1079 /* If the *_hw_beakpoint functions have not been defined
1080    elsewhere use the definitions in the target vector.  */
1081
1082 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1083    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1084    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1085    (including this one?).  OTHERTYPE is who knows what...  */
1086
1087 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1088 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1089  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1090 #endif
1091
1092 #if !defined(TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT)
1093 #define TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT(byte_count) \
1094     (*current_target.to_region_size_ok_for_hw_watchpoint) (byte_count)
1095 #endif
1096
1097
1098 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1099    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1100    success, non-zero for failure.  */
1101
1102 #ifndef target_insert_watchpoint
1103 #define target_insert_watchpoint(addr, len, type)       \
1104      (*current_target.to_insert_watchpoint) (addr, len, type)
1105
1106 #define target_remove_watchpoint(addr, len, type)       \
1107      (*current_target.to_remove_watchpoint) (addr, len, type)
1108 #endif
1109
1110 #ifndef target_insert_hw_breakpoint
1111 #define target_insert_hw_breakpoint(addr, save) \
1112      (*current_target.to_insert_hw_breakpoint) (addr, save)
1113
1114 #define target_remove_hw_breakpoint(addr, save) \
1115      (*current_target.to_remove_hw_breakpoint) (addr, save)
1116 #endif
1117
1118 #ifndef target_stopped_data_address
1119 #define target_stopped_data_address() \
1120     (*current_target.to_stopped_data_address) ()
1121 #endif
1122
1123 /* If defined, then we need to decr pc by this much after a hardware break-
1124    point.  Presumably this overrides DECR_PC_AFTER_BREAK...  */
1125
1126 #ifndef DECR_PC_AFTER_HW_BREAK
1127 #define DECR_PC_AFTER_HW_BREAK 0
1128 #endif
1129
1130 /* Sometimes gdb may pick up what appears to be a valid target address
1131    from a minimal symbol, but the value really means, essentially,
1132    "This is an index into a table which is populated when the inferior
1133    is run.  Therefore, do not attempt to use this as a PC."  */
1134
1135 #if !defined(PC_REQUIRES_RUN_BEFORE_USE)
1136 #define PC_REQUIRES_RUN_BEFORE_USE(pc) (0)
1137 #endif
1138
1139 /* This will only be defined by a target that supports catching vfork events,
1140    such as HP-UX.
1141
1142    On some targets (such as HP-UX 10.20 and earlier), resuming a newly vforked
1143    child process after it has exec'd, causes the parent process to resume as
1144    well.  To prevent the parent from running spontaneously, such targets should
1145    define this to a function that prevents that from happening.  */
1146 #if !defined(ENSURE_VFORKING_PARENT_REMAINS_STOPPED)
1147 #define ENSURE_VFORKING_PARENT_REMAINS_STOPPED(PID) (0)
1148 #endif
1149
1150 /* This will only be defined by a target that supports catching vfork events,
1151    such as HP-UX.
1152
1153    On some targets (such as HP-UX 10.20 and earlier), a newly vforked child
1154    process must be resumed when it delivers its exec event, before the parent
1155    vfork event will be delivered to us.  */
1156
1157 #if !defined(RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK)
1158 #define RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK() (0)
1159 #endif
1160
1161 /* Routines for maintenance of the target structures...
1162
1163    add_target:   Add a target to the list of all possible targets.
1164
1165    push_target:  Make this target the top of the stack of currently used
1166    targets, within its particular stratum of the stack.  Result
1167    is 0 if now atop the stack, nonzero if not on top (maybe
1168    should warn user).
1169
1170    unpush_target: Remove this from the stack of currently used targets,
1171    no matter where it is on the list.  Returns 0 if no
1172    change, 1 if removed from stack.
1173
1174    pop_target:   Remove the top thing on the stack of current targets.  */
1175
1176 extern void add_target (struct target_ops *);
1177
1178 extern int push_target (struct target_ops *);
1179
1180 extern int unpush_target (struct target_ops *);
1181
1182 extern void target_preopen (int);
1183
1184 extern void pop_target (void);
1185
1186 /* Struct section_table maps address ranges to file sections.  It is
1187    mostly used with BFD files, but can be used without (e.g. for handling
1188    raw disks, or files not in formats handled by BFD).  */
1189
1190 struct section_table
1191   {
1192     CORE_ADDR addr;             /* Lowest address in section */
1193     CORE_ADDR endaddr;          /* 1+highest address in section */
1194
1195     sec_ptr the_bfd_section;
1196
1197     bfd *bfd;                   /* BFD file pointer */
1198   };
1199
1200 /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
1201    Returns 0 if OK, 1 on error.  */
1202
1203 extern int
1204 build_section_table (bfd *, struct section_table **, struct section_table **);
1205
1206 /* From mem-break.c */
1207
1208 extern int memory_remove_breakpoint (CORE_ADDR, char *);
1209
1210 extern int memory_insert_breakpoint (CORE_ADDR, char *);
1211
1212 extern int default_memory_remove_breakpoint (CORE_ADDR, char *);
1213
1214 extern int default_memory_insert_breakpoint (CORE_ADDR, char *);
1215
1216 extern const unsigned char *memory_breakpoint_from_pc (CORE_ADDR *pcptr,
1217                                                        int *lenptr);
1218
1219
1220 /* From target.c */
1221
1222 extern void initialize_targets (void);
1223
1224 extern void noprocess (void);
1225
1226 extern void find_default_attach (char *, int);
1227
1228 extern void find_default_require_attach (char *, int);
1229
1230 extern void find_default_require_detach (int, char *, int);
1231
1232 extern void find_default_create_inferior (char *, char *, char **);
1233
1234 extern void find_default_clone_and_follow_inferior (int, int *);
1235
1236 extern struct target_ops *find_run_target (void);
1237
1238 extern struct target_ops *find_core_target (void);
1239
1240 extern struct target_ops *find_target_beneath (struct target_ops *);
1241
1242 extern int
1243 target_resize_to_sections (struct target_ops *target, int num_added);
1244
1245 extern void remove_target_sections (bfd *abfd);
1246
1247 \f
1248 /* Stuff that should be shared among the various remote targets.  */
1249
1250 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1251    information (higher values, more information).  */
1252 extern int remote_debug;
1253
1254 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1255 extern int baud_rate;
1256 /* Timeout limit for response from target. */
1257 extern int remote_timeout;
1258
1259 \f
1260 /* Functions for helping to write a native target.  */
1261
1262 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1263 extern void store_waitstatus (struct target_waitstatus *, int);
1264
1265 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1266    targ_signal SIGNO has an equivalent ``host'' representation.  */
1267 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1268    to the shorter target_signal_p() because it is far less ambigious.
1269    In this context ``target_signal'' refers to GDB's internal
1270    representation of the target's set of signals while ``host signal''
1271    refers to the target operating system's signal.  Confused?  */
1272
1273 extern int target_signal_to_host_p (enum target_signal signo);
1274
1275 /* Convert between host signal numbers and enum target_signal's.
1276    target_signal_to_host() returns 0 and prints a warning() on GDB's
1277    console if SIGNO has no equivalent host representation.  */
1278 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1279    refering to the target operating system's signal numbering.
1280    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1281    gdb_signal'' would probably be better as it is refering to GDB's
1282    internal representation of a target operating system's signal.  */
1283
1284 extern enum target_signal target_signal_from_host (int);
1285 extern int target_signal_to_host (enum target_signal);
1286
1287 /* Convert from a number used in a GDB command to an enum target_signal.  */
1288 extern enum target_signal target_signal_from_command (int);
1289
1290 /* Any target can call this to switch to remote protocol (in remote.c). */
1291 extern void push_remote_target (char *name, int from_tty);
1292 \f
1293 /* Imported from machine dependent code */
1294
1295 /* Blank target vector entries are initialized to target_ignore. */
1296 void target_ignore (void);
1297
1298 #endif /* !defined (TARGET_H) */