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
 332     /* Return the thread-local address at OFFSET in the
 333        thread-local storage for the thread PTID and the shared library
 334        or executable file given by OBJFILE.  If that block of
 335        thread-local storage hasn't been allocated yet, this function
 336        may return an error.  */
 337     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 338                                               struct objfile *objfile,
 339                                               CORE_ADDR offset);
 340
 341     int to_magic;
 342     /* Need sub-structure for target machine related rather than comm related?
 343      */
 344   };
 345
 346 /* Magic number for checking ops size.  If a struct doesn't end with this
 347    number, somebody changed the declaration but didn't change all the
 348    places that initialize one.  */
 349
 350 #define OPS_MAGIC       3840
 351
 352 /* The ops structure for our "current" target process.  This should
 353    never be NULL.  If there is no target, it points to the dummy_target.  */
 354
 355 extern struct target_ops current_target;
 356
 357 /* An item on the target stack.  */
 358
 359 struct target_stack_item
 360   {
 361     struct target_stack_item *next;
 362     struct target_ops *target_ops;
 363   };
 364
 365 /* The target stack.  */
 366
 367 extern struct target_stack_item *target_stack;
 368
 369 /* Define easy words for doing these operations on our current target.  */
 370
 371 #define target_shortname        (current_target.to_shortname)
 372 #define target_longname         (current_target.to_longname)
 373
 374 /* The open routine takes the rest of the parameters from the command,
 375    and (if successful) pushes a new target onto the stack.
 376    Targets should supply this routine, if only to provide an error message.  */
 377
 378 #define target_open(name, from_tty)                                     \
 379   do {                                                                  \
 380     dcache_invalidate (target_dcache);                                  \
 381     (*current_target.to_open) (name, from_tty);                         \
 382   } while (0)
 383
 384 /* Does whatever cleanup is required for a target that we are no longer
 385    going to be calling.  Argument says whether we are quitting gdb and
 386    should not get hung in case of errors, or whether we want a clean
 387    termination even if it takes a while.  This routine is automatically
 388    always called just before a routine is popped off the target stack.
 389    Closing file descriptors and freeing memory are typical things it should
 390    do.  */
 391
 392 #define target_close(quitting)  \
 393      (*current_target.to_close) (quitting)
 394
 395 /* Attaches to a process on the target side.  Arguments are as passed
 396    to the `attach' command by the user.  This routine can be called
 397    when the target is not on the target-stack, if the target_can_run
 398    routine returns 1; in that case, it must push itself onto the stack.
 399    Upon exit, the target should be ready for normal operations, and
 400    should be ready to deliver the status of the process immediately
 401    (without waiting) to an upcoming target_wait call.  */
 402
 403 #define target_attach(args, from_tty)   \
 404      (*current_target.to_attach) (args, from_tty)
 405
 406 /* The target_attach operation places a process under debugger control,
 407    and stops the process.
 408
 409    This operation provides a target-specific hook that allows the
 410    necessary bookkeeping to be performed after an attach completes.  */
 411 #define target_post_attach(pid) \
 412      (*current_target.to_post_attach) (pid)
 413
 414 /* Attaches to a process on the target side, if not already attached.
 415    (If already attached, takes no action.)
 416
 417    This operation can be used to follow the child process of a fork.
 418    On some targets, such child processes of an original inferior process
 419    are automatically under debugger control, and thus do not require an
 420    actual attach operation.  */
 421
 422 #define target_require_attach(args, from_tty)   \
 423      (*current_target.to_require_attach) (args, from_tty)
 424
 425 /* Takes a program previously attached to and detaches it.
 426    The program may resume execution (some targets do, some don't) and will
 427    no longer stop on signals, etc.  We better not have left any breakpoints
 428    in the program or it'll die when it hits one.  ARGS is arguments
 429    typed by the user (e.g. a signal to send the process).  FROM_TTY
 430    says whether to be verbose or not.  */
 431
 432 extern void target_detach (char *, int);
 433
 434 /* Detaches from a process on the target side, if not already dettached.
 435    (If already detached, takes no action.)
 436
 437    This operation can be used to follow the parent process of a fork.
 438    On some targets, such child processes of an original inferior process
 439    are automatically under debugger control, and thus do require an actual
 440    detach operation.
 441
 442    PID is the process id of the child to detach from.
 443    ARGS is arguments typed by the user (e.g. a signal to send the process).
 444    FROM_TTY says whether to be verbose or not.  */
 445
 446 #define target_require_detach(pid, args, from_tty)      \
 447      (*current_target.to_require_detach) (pid, args, from_tty)
 448
 449 /* Resume execution of the target process PTID.  STEP says whether to
 450    single-step or to run free; SIGGNAL is the signal to be given to
 451    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 452    pass TARGET_SIGNAL_DEFAULT.  */
 453
 454 #define target_resume(ptid, step, siggnal)                              \
 455   do {                                                                  \
 456     dcache_invalidate(target_dcache);                                   \
 457     (*current_target.to_resume) (ptid, step, siggnal);                  \
 458   } while (0)
 459
 460 /* Wait for process pid to do something.  PTID = -1 to wait for any
 461    pid to do something.  Return pid of child, or -1 in case of error;
 462    store status through argument pointer STATUS.  Note that it is
 463    _NOT_ OK to throw_exception() out of target_wait() without popping
 464    the debugging target from the stack; GDB isn't prepared to get back
 465    to the prompt with a debugging target but without the frame cache,
 466    stop_pc, etc., set up.  */
 467
 468 #define target_wait(ptid, status)               \
 469      (*current_target.to_wait) (ptid, status)
 470
 471 /* The target_wait operation waits for a process event to occur, and
 472    thereby stop the process.
 473
 474    On some targets, certain events may happen in sequences.  gdb's
 475    correct response to any single event of such a sequence may require
 476    knowledge of what earlier events in the sequence have been seen.
 477
 478    This operation provides a target-specific hook that allows the
 479    necessary bookkeeping to be performed to track such sequences.  */
 480
 481 #define target_post_wait(ptid, status) \
 482      (*current_target.to_post_wait) (ptid, status)
 483
 484 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 485
 486 #define target_fetch_registers(regno)   \
 487      (*current_target.to_fetch_registers) (regno)
 488
 489 /* Store at least register REGNO, or all regs if REGNO == -1.
 490    It can store as many registers as it wants to, so target_prepare_to_store
 491    must have been previously called.  Calls error() if there are problems.  */
 492
 493 #define target_store_registers(regs)    \
 494      (*current_target.to_store_registers) (regs)
 495
 496 /* Get ready to modify the registers array.  On machines which store
 497    individual registers, this doesn't need to do anything.  On machines
 498    which store all the registers in one fell swoop, this makes sure
 499    that REGISTERS contains all the registers from the program being
 500    debugged.  */
 501
 502 #define target_prepare_to_store()       \
 503      (*current_target.to_prepare_to_store) ()
 504
 505 extern DCACHE *target_dcache;
 506
 507 extern int do_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
 508                            struct mem_attrib *attrib);
 509
 510 extern int target_read_string (CORE_ADDR, char **, int, int *);
 511
 512 extern int target_read_memory (CORE_ADDR memaddr, char *myaddr, int len);
 513
 514 extern int target_write_memory (CORE_ADDR memaddr, char *myaddr, int len);
 515
 516 extern int xfer_memory (CORE_ADDR, char *, int, int,
 517                         struct mem_attrib *, struct target_ops *);
 518
 519 extern int child_xfer_memory (CORE_ADDR, char *, int, int,
 520                               struct mem_attrib *, struct target_ops *);
 521
 522 /* Make a single attempt at transfering LEN bytes.  On a successful
 523    transfer, the number of bytes actually transfered is returned and
 524    ERR is set to 0.  When a transfer fails, -1 is returned (the number
 525    of bytes actually transfered is not defined) and ERR is set to a
 526    non-zero error indication.  */
 527
 528 extern int
 529 target_read_memory_partial (CORE_ADDR addr, char *buf, int len, int *err);
 530
 531 extern int
 532 target_write_memory_partial (CORE_ADDR addr, char *buf, int len, int *err);
 533
 534 extern char *child_pid_to_exec_file (int);
 535
 536 extern char *child_core_file_to_sym_file (char *);
 537
 538 #if defined(CHILD_POST_ATTACH)
 539 extern void child_post_attach (int);
 540 #endif
 541
 542 extern void child_post_wait (ptid_t, int);
 543
 544 extern void child_post_startup_inferior (ptid_t);
 545
 546 extern void child_acknowledge_created_inferior (int);
 547
 548 extern void child_clone_and_follow_inferior (int, int *);
 549
 550 extern void child_post_follow_inferior_by_clone (void);
 551
 552 extern int child_insert_fork_catchpoint (int);
 553
 554 extern int child_remove_fork_catchpoint (int);
 555
 556 extern int child_insert_vfork_catchpoint (int);
 557
 558 extern int child_remove_vfork_catchpoint (int);
 559
 560 extern int child_has_forked (int, int *);
 561
 562 extern int child_has_vforked (int, int *);
 563
 564 extern void child_acknowledge_created_inferior (int);
 565
 566 extern int child_can_follow_vfork_prior_to_exec (void);
 567
 568 extern void child_post_follow_vfork (int, int, int, int);
 569
 570 extern int child_insert_exec_catchpoint (int);
 571
 572 extern int child_remove_exec_catchpoint (int);
 573
 574 extern int child_has_execd (int, char **);
 575
 576 extern int child_reported_exec_events_per_exec_call (void);
 577
 578 extern int child_has_syscall_event (int, enum target_waitkind *, int *);
 579
 580 extern int child_has_exited (int, int, int *);
 581
 582 extern int child_thread_alive (ptid_t);
 583
 584 /* From exec.c */
 585
 586 extern void print_section_info (struct target_ops *, bfd *);
 587
 588 /* Print a line about the current target.  */
 589
 590 #define target_files_info()     \
 591      (*current_target.to_files_info) (&current_target)
 592
 593 /* Insert a breakpoint at address ADDR in the target machine.
 594    SAVE is a pointer to memory allocated for saving the
 595    target contents.  It is guaranteed by the caller to be long enough
 596    to save "sizeof BREAKPOINT" bytes.  Result is 0 for success, or
 597    an errno value.  */
 598
 599 #define target_insert_breakpoint(addr, save)    \
 600      (*current_target.to_insert_breakpoint) (addr, save)
 601
 602 /* Remove a breakpoint at address ADDR in the target machine.
 603    SAVE is a pointer to the same save area
 604    that was previously passed to target_insert_breakpoint.
 605    Result is 0 for success, or an errno value.  */
 606
 607 #define target_remove_breakpoint(addr, save)    \
 608      (*current_target.to_remove_breakpoint) (addr, save)
 609
 610 /* Initialize the terminal settings we record for the inferior,
 611    before we actually run the inferior.  */
 612
 613 #define target_terminal_init() \
 614      (*current_target.to_terminal_init) ()
 615
 616 /* Put the inferior's terminal settings into effect.
 617    This is preparation for starting or resuming the inferior.  */
 618
 619 #define target_terminal_inferior() \
 620      (*current_target.to_terminal_inferior) ()
 621
 622 /* Put some of our terminal settings into effect,
 623    enough to get proper results from our output,
 624    but do not change into or out of RAW mode
 625    so that no input is discarded.
 626
 627    After doing this, either terminal_ours or terminal_inferior
 628    should be called to get back to a normal state of affairs.  */
 629
 630 #define target_terminal_ours_for_output() \
 631      (*current_target.to_terminal_ours_for_output) ()
 632
 633 /* Put our terminal settings into effect.
 634    First record the inferior's terminal settings
 635    so they can be restored properly later.  */
 636
 637 #define target_terminal_ours() \
 638      (*current_target.to_terminal_ours) ()
 639
 640 /* Save our terminal settings.
 641    This is called from TUI after entering or leaving the curses
 642    mode.  Since curses modifies our terminal this call is here
 643    to take this change into account.  */
 644
 645 #define target_terminal_save_ours() \
 646      (*current_target.to_terminal_save_ours) ()
 647
 648 /* Print useful information about our terminal status, if such a thing
 649    exists.  */
 650
 651 #define target_terminal_info(arg, from_tty) \
 652      (*current_target.to_terminal_info) (arg, from_tty)
 653
 654 /* Kill the inferior process.   Make it go away.  */
 655
 656 #define target_kill() \
 657      (*current_target.to_kill) ()
 658
 659 /* Load an executable file into the target process.  This is expected
 660    to not only bring new code into the target process, but also to
 661    update GDB's symbol tables to match.  */
 662
 663 extern void target_load (char *arg, int from_tty);
 664
 665 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 666    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 667    symbol should be returned.  The result is 0 if successful, nonzero
 668    if the symbol does not exist in the target environment.  This
 669    function should not call error() if communication with the target
 670    is interrupted, since it is called from symbol reading, but should
 671    return nonzero, possibly doing a complain().  */
 672
 673 #define target_lookup_symbol(name, addrp) \
 674      (*current_target.to_lookup_symbol) (name, addrp)
 675
 676 /* Start an inferior process and set inferior_ptid to its pid.
 677    EXEC_FILE is the file to run.
 678    ALLARGS is a string containing the arguments to the program.
 679    ENV is the environment vector to pass.  Errors reported with error().
 680    On VxWorks and various standalone systems, we ignore exec_file.  */
 681
 682 #define target_create_inferior(exec_file, args, env)    \
 683      (*current_target.to_create_inferior) (exec_file, args, env)
 684
 685
 686 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 687    notification of inferior events such as fork and vork immediately
 688    after the inferior is created.  (This because of how gdb gets an
 689    inferior created via invoking a shell to do it.  In such a scenario,
 690    if the shell init file has commands in it, the shell will fork and
 691    exec for each of those commands, and we will see each such fork
 692    event.  Very bad.)
 693
 694    Such targets will supply an appropriate definition for this function.  */
 695
 696 #define target_post_startup_inferior(ptid) \
 697      (*current_target.to_post_startup_inferior) (ptid)
 698
 699 /* On some targets, the sequence of starting up an inferior requires
 700    some synchronization between gdb and the new inferior process, PID.  */
 701
 702 #define target_acknowledge_created_inferior(pid) \
 703      (*current_target.to_acknowledge_created_inferior) (pid)
 704
 705 /* An inferior process has been created via a fork() or similar
 706    system call.  This function will clone the debugger, then ensure
 707    that CHILD_PID is attached to by that debugger.
 708
 709    FOLLOWED_CHILD is set TRUE on return *for the clone debugger only*,
 710    and FALSE otherwise.  (The original and clone debuggers can use this
 711    to determine which they are, if need be.)
 712
 713    (This is not a terribly useful feature without a GUI to prevent
 714    the two debuggers from competing for shell input.)  */
 715
 716 #define target_clone_and_follow_inferior(child_pid,followed_child) \
 717      (*current_target.to_clone_and_follow_inferior) (child_pid, followed_child)
 718
 719 /* This operation is intended to be used as the last in a sequence of
 720    steps taken when following both parent and child of a fork.  This
 721    is used by a clone of the debugger, which will follow the child.
 722
 723    The original debugger has detached from this process, and the
 724    clone has attached to it.
 725
 726    On some targets, this requires a bit of cleanup to make it work
 727    correctly.  */
 728
 729 #define target_post_follow_inferior_by_clone() \
 730      (*current_target.to_post_follow_inferior_by_clone) ()
 731
 732 /* On some targets, we can catch an inferior fork or vfork event when
 733    it occurs.  These functions insert/remove an already-created
 734    catchpoint for such events.  */
 735
 736 #define target_insert_fork_catchpoint(pid) \
 737      (*current_target.to_insert_fork_catchpoint) (pid)
 738
 739 #define target_remove_fork_catchpoint(pid) \
 740      (*current_target.to_remove_fork_catchpoint) (pid)
 741
 742 #define target_insert_vfork_catchpoint(pid) \
 743      (*current_target.to_insert_vfork_catchpoint) (pid)
 744
 745 #define target_remove_vfork_catchpoint(pid) \
 746      (*current_target.to_remove_vfork_catchpoint) (pid)
 747
 748 /* Returns TRUE if PID has invoked the fork() system call.  And,
 749    also sets CHILD_PID to the process id of the other ("child")
 750    inferior process that was created by that call.  */
 751
 752 #define target_has_forked(pid,child_pid) \
 753      (*current_target.to_has_forked) (pid,child_pid)
 754
 755 /* Returns TRUE if PID has invoked the vfork() system call.  And,
 756    also sets CHILD_PID to the process id of the other ("child")
 757    inferior process that was created by that call.  */
 758
 759 #define target_has_vforked(pid,child_pid) \
 760      (*current_target.to_has_vforked) (pid,child_pid)
 761
 762 /* Some platforms (such as pre-10.20 HP-UX) don't allow us to do
 763    anything to a vforked child before it subsequently calls exec().
 764    On such platforms, we say that the debugger cannot "follow" the
 765    child until it has vforked.
 766
 767    This function should be defined to return 1 by those targets
 768    which can allow the debugger to immediately follow a vforked
 769    child, and 0 if they cannot.  */
 770
 771 #define target_can_follow_vfork_prior_to_exec() \
 772      (*current_target.to_can_follow_vfork_prior_to_exec) ()
 773
 774 /* An inferior process has been created via a vfork() system call.
 775    The debugger has followed the parent, the child, or both.  The
 776    process of setting up for that follow may have required some
 777    target-specific trickery to track the sequence of reported events.
 778    If so, this function should be defined by those targets that
 779    require the debugger to perform cleanup or initialization after
 780    the vfork follow.  */
 781
 782 #define target_post_follow_vfork(parent_pid,followed_parent,child_pid,followed_child) \
 783      (*current_target.to_post_follow_vfork) (parent_pid,followed_parent,child_pid,followed_child)
 784
 785 /* On some targets, we can catch an inferior exec event when it
 786    occurs.  These functions insert/remove an already-created
 787    catchpoint for such events.  */
 788
 789 #define target_insert_exec_catchpoint(pid) \
 790      (*current_target.to_insert_exec_catchpoint) (pid)
 791
 792 #define target_remove_exec_catchpoint(pid) \
 793      (*current_target.to_remove_exec_catchpoint) (pid)
 794
 795 /* Returns TRUE if PID has invoked a flavor of the exec() system call.
 796    And, also sets EXECD_PATHNAME to the pathname of the executable
 797    file that was passed to exec(), and is now being executed.  */
 798
 799 #define target_has_execd(pid,execd_pathname) \
 800      (*current_target.to_has_execd) (pid,execd_pathname)
 801
 802 /* Returns the number of exec events that are reported when a process
 803    invokes a flavor of the exec() system call on this target, if exec
 804    events are being reported.  */
 805
 806 #define target_reported_exec_events_per_exec_call() \
 807      (*current_target.to_reported_exec_events_per_exec_call) ()
 808
 809 /* Returns TRUE if PID has reported a syscall event.  And, also sets
 810    KIND to the appropriate TARGET_WAITKIND_, and sets SYSCALL_ID to
 811    the unique integer ID of the syscall.  */
 812
 813 #define target_has_syscall_event(pid,kind,syscall_id) \
 814      (*current_target.to_has_syscall_event) (pid,kind,syscall_id)
 815
 816 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 817    exit code of PID, if any.  */
 818
 819 #define target_has_exited(pid,wait_status,exit_status) \
 820      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 821
 822 /* The debugger has completed a blocking wait() call.  There is now
 823    some process event that must be processed.  This function should
 824    be defined by those targets that require the debugger to perform
 825    cleanup or internal state changes in response to the process event.  */
 826
 827 /* The inferior process has died.  Do what is right.  */
 828
 829 #define target_mourn_inferior() \
 830      (*current_target.to_mourn_inferior) ()
 831
 832 /* Does target have enough data to do a run or attach command? */
 833
 834 #define target_can_run(t) \
 835      ((t)->to_can_run) ()
 836
 837 /* post process changes to signal handling in the inferior.  */
 838
 839 #define target_notice_signals(ptid) \
 840      (*current_target.to_notice_signals) (ptid)
 841
 842 /* Check to see if a thread is still alive.  */
 843
 844 #define target_thread_alive(ptid) \
 845      (*current_target.to_thread_alive) (ptid)
 846
 847 /* Query for new threads and add them to the thread list.  */
 848
 849 #define target_find_new_threads() \
 850      (*current_target.to_find_new_threads) (); \
 851
 852 /* Make target stop in a continuable fashion.  (For instance, under
 853    Unix, this should act like SIGSTOP).  This function is normally
 854    used by GUIs to implement a stop button.  */
 855
 856 #define target_stop current_target.to_stop
 857
 858 /* Queries the target side for some information.  The first argument is a
 859    letter specifying the type of the query, which is used to determine who
 860    should process it.  The second argument is a string that specifies which
 861    information is desired and the third is a buffer that carries back the
 862    response from the target side. The fourth parameter is the size of the
 863    output buffer supplied.  */
 864
 865 #define target_query(query_type, query, resp_buffer, bufffer_size)      \
 866      (*current_target.to_query) (query_type, query, resp_buffer, bufffer_size)
 867
 868 /* Send the specified COMMAND to the target's monitor
 869    (shell,interpreter) for execution.  The result of the query is
 870    placed in OUTBUF.  */
 871
 872 #define target_rcmd(command, outbuf) \
 873      (*current_target.to_rcmd) (command, outbuf)
 874
 875
 876 /* Get the symbol information for a breakpointable routine called when
 877    an exception event occurs.
 878    Intended mainly for C++, and for those
 879    platforms/implementations where such a callback mechanism is available,
 880    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 881    different mechanisms for debugging exceptions.  */
 882
 883 #define target_enable_exception_callback(kind, enable) \
 884      (*current_target.to_enable_exception_callback) (kind, enable)
 885
 886 /* Get the current exception event kind -- throw or catch, etc.  */
 887
 888 #define target_get_current_exception_event() \
 889      (*current_target.to_get_current_exception_event) ()
 890
 891 /* Pointer to next target in the chain, e.g. a core file and an exec file.  */
 892
 893 #define target_next \
 894      (current_target.to_next)
 895
 896 /* Does the target include all of memory, or only part of it?  This
 897    determines whether we look up the target chain for other parts of
 898    memory if this target can't satisfy a request.  */
 899
 900 #define target_has_all_memory   \
 901      (current_target.to_has_all_memory)
 902
 903 /* Does the target include memory?  (Dummy targets don't.)  */
 904
 905 #define target_has_memory       \
 906      (current_target.to_has_memory)
 907
 908 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 909    we start a process.)  */
 910
 911 #define target_has_stack        \
 912      (current_target.to_has_stack)
 913
 914 /* Does the target have registers?  (Exec files don't.)  */
 915
 916 #define target_has_registers    \
 917      (current_target.to_has_registers)
 918
 919 /* Does the target have execution?  Can we make it jump (through
 920    hoops), or pop its stack a few times?  FIXME: If this is to work that
 921    way, it needs to check whether an inferior actually exists.
 922    remote-udi.c and probably other targets can be the current target
 923    when the inferior doesn't actually exist at the moment.  Right now
 924    this just tells us whether this target is *capable* of execution.  */
 925
 926 #define target_has_execution    \
 927      (current_target.to_has_execution)
 928
 929 /* Can the target support the debugger control of thread execution?
 930    a) Can it lock the thread scheduler?
 931    b) Can it switch the currently running thread?  */
 932
 933 #define target_can_lock_scheduler \
 934      (current_target.to_has_thread_control & tc_schedlock)
 935
 936 #define target_can_switch_threads \
 937      (current_target.to_has_thread_control & tc_switch)
 938
 939 /* Can the target support asynchronous execution? */
 940 #define target_can_async_p() (current_target.to_can_async_p ())
 941
 942 /* Is the target in asynchronous execution mode? */
 943 #define target_is_async_p() (current_target.to_is_async_p())
 944
 945 /* Put the target in async mode with the specified callback function. */
 946 #define target_async(CALLBACK,CONTEXT) \
 947      (current_target.to_async((CALLBACK), (CONTEXT)))
 948
 949 /* This is to be used ONLY within run_stack_dummy(). It
 950    provides a workaround, to have inferior function calls done in
 951    sychronous mode, even though the target is asynchronous. After
 952    target_async_mask(0) is called, calls to target_can_async_p() will
 953    return FALSE , so that target_resume() will not try to start the
 954    target asynchronously. After the inferior stops, we IMMEDIATELY
 955    restore the previous nature of the target, by calling
 956    target_async_mask(1). After that, target_can_async_p() will return
 957    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 958
 959    FIXME ezannoni 1999-12-13: we won't need this once we move
 960    the turning async on and off to the single execution commands,
 961    from where it is done currently, in remote_resume().  */
 962
 963 #define target_async_mask_value \
 964      (current_target.to_async_mask_value)
 965
 966 extern int target_async_mask (int mask);
 967
 968 extern void target_link (char *, CORE_ADDR *);
 969
 970 /* Converts a process id to a string.  Usually, the string just contains
 971    `process xyz', but on some systems it may contain
 972    `process xyz thread abc'.  */
 973
 974 #undef target_pid_to_str
 975 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
 976
 977 #ifndef target_tid_to_str
 978 #define target_tid_to_str(PID) \
 979      target_pid_to_str (PID)
 980 extern char *normal_pid_to_str (ptid_t ptid);
 981 #endif
 982
 983 /* Return a short string describing extra information about PID,
 984    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
 985    is okay.  */
 986
 987 #define target_extra_thread_info(TP) \
 988      (current_target.to_extra_thread_info (TP))
 989
 990 /*
 991  * New Objfile Event Hook:
 992  *
 993  * Sometimes a GDB component wants to get notified whenever a new
 994  * objfile is loaded.  Mainly this is used by thread-debugging
 995  * implementations that need to know when symbols for the target
 996  * thread implemenation are available.
 997  *
 998  * The old way of doing this is to define a macro 'target_new_objfile'
 999  * that points to the function that you want to be called on every
1000  * objfile/shlib load.
1001  *
1002  * The new way is to grab the function pointer, 'target_new_objfile_hook',
1003  * and point it to the function that you want to be called on every
1004  * objfile/shlib load.
1005  *
1006  * If multiple clients are willing to be cooperative, they can each
1007  * save a pointer to the previous value of target_new_objfile_hook
1008  * before modifying it, and arrange for their function to call the
1009  * previous function in the chain.  In that way, multiple clients
1010  * can receive this notification (something like with signal handlers).
1011  */
1012
1013 extern void (*target_new_objfile_hook) (struct objfile *);
1014
1015 #ifndef target_pid_or_tid_to_str
1016 #define target_pid_or_tid_to_str(ID) \
1017      target_pid_to_str (ID)
1018 #endif
1019
1020 /* Attempts to find the pathname of the executable file
1021    that was run to create a specified process.
1022
1023    The process PID must be stopped when this operation is used.
1024
1025    If the executable file cannot be determined, NULL is returned.
1026
1027    Else, a pointer to a character string containing the pathname
1028    is returned.  This string should be copied into a buffer by
1029    the client if the string will not be immediately used, or if
1030    it must persist.  */
1031
1032 #define target_pid_to_exec_file(pid) \
1033      (current_target.to_pid_to_exec_file) (pid)
1034
1035 /*
1036  * Iterator function for target memory regions.
1037  * Calls a callback function once for each memory region 'mapped'
1038  * in the child process.  Defined as a simple macro rather than
1039  * as a function macro so that it can be tested for nullity.
1040  */
1041
1042 #define target_find_memory_regions(FUNC, DATA) \
1043      (current_target.to_find_memory_regions) (FUNC, DATA)
1044
1045 /*
1046  * Compose corefile .note section.
1047  */
1048
1049 #define target_make_corefile_notes(BFD, SIZE_P) \
1050      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1051
1052 /* Thread-local values.  */
1053 #define target_get_thread_local_address \
1054     (current_target.to_get_thread_local_address)
1055 #define target_get_thread_local_address_p() \
1056     (target_get_thread_local_address != NULL)
1057
1058 /* Hook to call target-dependent code after reading in a new symbol table.  */
1059
1060 #ifndef TARGET_SYMFILE_POSTREAD
1061 #define TARGET_SYMFILE_POSTREAD(OBJFILE)
1062 #endif
1063
1064 /* Hook to call target dependent code just after inferior target process has
1065    started.  */
1066
1067 #ifndef TARGET_CREATE_INFERIOR_HOOK
1068 #define TARGET_CREATE_INFERIOR_HOOK(PID)
1069 #endif
1070
1071 /* Hardware watchpoint interfaces.  */
1072
1073 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1074    write).  */
1075
1076 #ifndef STOPPED_BY_WATCHPOINT
1077 #define STOPPED_BY_WATCHPOINT(w) \
1078    (*current_target.to_stopped_by_watchpoint) ()
1079 #endif
1080
1081 /* HP-UX supplies these operations, which respectively disable and enable
1082    the memory page-protections that are used to implement hardware watchpoints
1083    on that platform.  See wait_for_inferior's use of these.  */
1084
1085 #if !defined(TARGET_DISABLE_HW_WATCHPOINTS)
1086 #define TARGET_DISABLE_HW_WATCHPOINTS(pid)
1087 #endif
1088
1089 #if !defined(TARGET_ENABLE_HW_WATCHPOINTS)
1090 #define TARGET_ENABLE_HW_WATCHPOINTS(pid)
1091 #endif
1092
1093 /* Provide defaults for hardware watchpoint functions.  */
1094
1095 /* If the *_hw_beakpoint functions have not been defined
1096    elsewhere use the definitions in the target vector.  */
1097
1098 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1099    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1100    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1101    (including this one?).  OTHERTYPE is who knows what...  */
1102
1103 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1104 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1105  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1106 #endif
1107
1108 #if !defined(TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT)
1109 #define TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT(byte_count) \
1110     (*current_target.to_region_size_ok_for_hw_watchpoint) (byte_count)
1111 #endif
1112
1113
1114 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1115    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1116    success, non-zero for failure.  */
1117
1118 #ifndef target_insert_watchpoint
1119 #define target_insert_watchpoint(addr, len, type)       \
1120      (*current_target.to_insert_watchpoint) (addr, len, type)
1121
1122 #define target_remove_watchpoint(addr, len, type)       \
1123      (*current_target.to_remove_watchpoint) (addr, len, type)
1124 #endif
1125
1126 #ifndef target_insert_hw_breakpoint
1127 #define target_insert_hw_breakpoint(addr, save) \
1128      (*current_target.to_insert_hw_breakpoint) (addr, save)
1129
1130 #define target_remove_hw_breakpoint(addr, save) \
1131      (*current_target.to_remove_hw_breakpoint) (addr, save)
1132 #endif
1133
1134 #ifndef target_stopped_data_address
1135 #define target_stopped_data_address() \
1136     (*current_target.to_stopped_data_address) ()
1137 #endif
1138
1139 /* If defined, then we need to decr pc by this much after a hardware break-
1140    point.  Presumably this overrides DECR_PC_AFTER_BREAK...  */
1141
1142 #ifndef DECR_PC_AFTER_HW_BREAK
1143 #define DECR_PC_AFTER_HW_BREAK 0
1144 #endif
1145
1146 /* Sometimes gdb may pick up what appears to be a valid target address
1147    from a minimal symbol, but the value really means, essentially,
1148    "This is an index into a table which is populated when the inferior
1149    is run.  Therefore, do not attempt to use this as a PC."  */
1150
1151 #if !defined(PC_REQUIRES_RUN_BEFORE_USE)
1152 #define PC_REQUIRES_RUN_BEFORE_USE(pc) (0)
1153 #endif
1154
1155 /* This will only be defined by a target that supports catching vfork events,
1156    such as HP-UX.
1157
1158    On some targets (such as HP-UX 10.20 and earlier), resuming a newly vforked
1159    child process after it has exec'd, causes the parent process to resume as
1160    well.  To prevent the parent from running spontaneously, such targets should
1161    define this to a function that prevents that from happening.  */
1162 #if !defined(ENSURE_VFORKING_PARENT_REMAINS_STOPPED)
1163 #define ENSURE_VFORKING_PARENT_REMAINS_STOPPED(PID) (0)
1164 #endif
1165
1166 /* This will only be defined by a target that supports catching vfork events,
1167    such as HP-UX.
1168
1169    On some targets (such as HP-UX 10.20 and earlier), a newly vforked child
1170    process must be resumed when it delivers its exec event, before the parent
1171    vfork event will be delivered to us.  */
1172
1173 #if !defined(RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK)
1174 #define RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK() (0)
1175 #endif
1176
1177 /* Routines for maintenance of the target structures...
1178
1179    add_target:   Add a target to the list of all possible targets.
1180
1181    push_target:  Make this target the top of the stack of currently used
1182    targets, within its particular stratum of the stack.  Result
1183    is 0 if now atop the stack, nonzero if not on top (maybe
1184    should warn user).
1185
1186    unpush_target: Remove this from the stack of currently used targets,
1187    no matter where it is on the list.  Returns 0 if no
1188    change, 1 if removed from stack.
1189
1190    pop_target:   Remove the top thing on the stack of current targets.  */
1191
1192 extern void add_target (struct target_ops *);
1193
1194 extern int push_target (struct target_ops *);
1195
1196 extern int unpush_target (struct target_ops *);
1197
1198 extern void target_preopen (int);
1199
1200 extern void pop_target (void);
1201
1202 /* Struct section_table maps address ranges to file sections.  It is
1203    mostly used with BFD files, but can be used without (e.g. for handling
1204    raw disks, or files not in formats handled by BFD).  */
1205
1206 struct section_table
1207   {
1208     CORE_ADDR addr;             /* Lowest address in section */
1209     CORE_ADDR endaddr;          /* 1+highest address in section */
1210
1211     sec_ptr the_bfd_section;
1212
1213     bfd *bfd;                   /* BFD file pointer */
1214   };
1215
1216 /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
1217    Returns 0 if OK, 1 on error.  */
1218
1219 extern int
1220 build_section_table (bfd *, struct section_table **, struct section_table **);
1221
1222 /* From mem-break.c */
1223
1224 extern int memory_remove_breakpoint (CORE_ADDR, char *);
1225
1226 extern int memory_insert_breakpoint (CORE_ADDR, char *);
1227
1228 extern int default_memory_remove_breakpoint (CORE_ADDR, char *);
1229
1230 extern int default_memory_insert_breakpoint (CORE_ADDR, char *);
1231
1232 extern const unsigned char *memory_breakpoint_from_pc (CORE_ADDR *pcptr,
1233                                                        int *lenptr);
1234
1235
1236 /* From target.c */
1237
1238 extern void initialize_targets (void);
1239
1240 extern void noprocess (void);
1241
1242 extern void find_default_attach (char *, int);
1243
1244 extern void find_default_require_attach (char *, int);
1245
1246 extern void find_default_require_detach (int, char *, int);
1247
1248 extern void find_default_create_inferior (char *, char *, char **);
1249
1250 extern void find_default_clone_and_follow_inferior (int, int *);
1251
1252 extern struct target_ops *find_run_target (void);
1253
1254 extern struct target_ops *find_core_target (void);
1255
1256 extern struct target_ops *find_target_beneath (struct target_ops *);
1257
1258 extern int
1259 target_resize_to_sections (struct target_ops *target, int num_added);
1260
1261 extern void remove_target_sections (bfd *abfd);
1262
1263 \f
1264 /* Stuff that should be shared among the various remote targets.  */
1265
1266 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1267    information (higher values, more information).  */
1268 extern int remote_debug;
1269
1270 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1271 extern int baud_rate;
1272 /* Timeout limit for response from target. */
1273 extern int remote_timeout;
1274
1275 \f
1276 /* Functions for helping to write a native target.  */
1277
1278 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1279 extern void store_waitstatus (struct target_waitstatus *, int);
1280
1281 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1282    targ_signal SIGNO has an equivalent ``host'' representation.  */
1283 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1284    to the shorter target_signal_p() because it is far less ambigious.
1285    In this context ``target_signal'' refers to GDB's internal
1286    representation of the target's set of signals while ``host signal''
1287    refers to the target operating system's signal.  Confused?  */
1288
1289 extern int target_signal_to_host_p (enum target_signal signo);
1290
1291 /* Convert between host signal numbers and enum target_signal's.
1292    target_signal_to_host() returns 0 and prints a warning() on GDB's
1293    console if SIGNO has no equivalent host representation.  */
1294 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1295    refering to the target operating system's signal numbering.
1296    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1297    gdb_signal'' would probably be better as it is refering to GDB's
1298    internal representation of a target operating system's signal.  */
1299
1300 extern enum target_signal target_signal_from_host (int);
1301 extern int target_signal_to_host (enum target_signal);
1302
1303 /* Convert from a number used in a GDB command to an enum target_signal.  */
1304 extern enum target_signal target_signal_from_command (int);
1305
1306 /* Any target can call this to switch to remote protocol (in remote.c). */
1307 extern void push_remote_target (char *name, int from_tty);
1308 \f
1309 /* Imported from machine dependent code */
1310
1311 /* Blank target vector entries are initialized to target_ignore. */
1312 void target_ignore (void);
1313
1314 #endif /* !defined (TARGET_H) */