gdb/target.h

   1 /* Interface between GDB and target environments, including files and processes
   2
   3    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   4    1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
   5    Free Software Foundation, Inc.
   6
   7    Contributed by Cygnus Support.  Written by John Gilmore.
   8
   9    This file is part of GDB.
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24    Boston, MA 02110-1301, USA.  */
  25
  26 #if !defined (TARGET_H)
  27 #define TARGET_H
  28
  29 struct objfile;
  30 struct ui_file;
  31 struct mem_attrib;
  32 struct target_ops;
  33 struct bp_target_info;
  34
  35 /* This include file defines the interface between the main part
  36    of the debugger, and the part which is target-specific, or
  37    specific to the communications interface between us and the
  38    target.
  39
  40    A TARGET is an interface between the debugger and a particular
  41    kind of file or process.  Targets can be STACKED in STRATA,
  42    so that more than one target can potentially respond to a request.
  43    In particular, memory accesses will walk down the stack of targets
  44    until they find a target that is interested in handling that particular
  45    address.  STRATA are artificial boundaries on the stack, within
  46    which particular kinds of targets live.  Strata exist so that
  47    people don't get confused by pushing e.g. a process target and then
  48    a file target, and wondering why they can't see the current values
  49    of variables any more (the file target is handling them and they
  50    never get to the process target).  So when you push a file target,
  51    it goes into the file stratum, which is always below the process
  52    stratum.  */
  53
  54 #include "bfd.h"
  55 #include "symtab.h"
  56 #include "dcache.h"
  57 #include "memattr.h"
  58 #include "vec.h"
  59
  60 enum strata
  61   {
  62     dummy_stratum,              /* The lowest of the low */
  63     file_stratum,               /* Executable files, etc */
  64     core_stratum,               /* Core dump files */
  65     download_stratum,           /* Downloading of remote targets */
  66     process_stratum,            /* Executing processes */
  67     thread_stratum              /* Executing threads */
  68   };
  69
  70 enum thread_control_capabilities
  71   {
  72     tc_none = 0,                /* Default: can't control thread execution.  */
  73     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  74     tc_switch = 2               /* Can switch the running thread on demand.  */
  75   };
  76
  77 /* Stuff for target_wait.  */
  78
  79 /* Generally, what has the program done?  */
  80 enum target_waitkind
  81   {
  82     /* The program has exited.  The exit status is in value.integer.  */
  83     TARGET_WAITKIND_EXITED,
  84
  85     /* The program has stopped with a signal.  Which signal is in
  86        value.sig.  */
  87     TARGET_WAITKIND_STOPPED,
  88
  89     /* The program has terminated with a signal.  Which signal is in
  90        value.sig.  */
  91     TARGET_WAITKIND_SIGNALLED,
  92
  93     /* The program is letting us know that it dynamically loaded something
  94        (e.g. it called load(2) on AIX).  */
  95     TARGET_WAITKIND_LOADED,
  96
  97     /* The program has forked.  A "related" process' ID is in
  98        value.related_pid.  I.e., if the child forks, value.related_pid
  99        is the parent's ID.  */
 100
 101     TARGET_WAITKIND_FORKED,
 102
 103     /* The program has vforked.  A "related" process's ID is in
 104        value.related_pid.  */
 105
 106     TARGET_WAITKIND_VFORKED,
 107
 108     /* The program has exec'ed a new executable file.  The new file's
 109        pathname is pointed to by value.execd_pathname.  */
 110
 111     TARGET_WAITKIND_EXECD,
 112
 113     /* The program has entered or returned from a system call.  On
 114        HP-UX, this is used in the hardware watchpoint implementation.
 115        The syscall's unique integer ID number is in value.syscall_id */
 116
 117     TARGET_WAITKIND_SYSCALL_ENTRY,
 118     TARGET_WAITKIND_SYSCALL_RETURN,
 119
 120     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 121        within target_wait, but I'm not sure target_wait should be resuming the
 122        inferior.  */
 123     TARGET_WAITKIND_SPURIOUS,
 124
 125     /* An event has occured, but we should wait again.
 126        Remote_async_wait() returns this when there is an event
 127        on the inferior, but the rest of the world is not interested in
 128        it. The inferior has not stopped, but has just sent some output
 129        to the console, for instance. In this case, we want to go back
 130        to the event loop and wait there for another event from the
 131        inferior, rather than being stuck in the remote_async_wait()
 132        function. This way the event loop is responsive to other events,
 133        like for instance the user typing.  */
 134     TARGET_WAITKIND_IGNORE
 135   };
 136
 137 struct target_waitstatus
 138   {
 139     enum target_waitkind kind;
 140
 141     /* Forked child pid, execd pathname, exit status or signal number.  */
 142     union
 143       {
 144         int integer;
 145         enum target_signal sig;
 146         int related_pid;
 147         char *execd_pathname;
 148         int syscall_id;
 149       }
 150     value;
 151   };
 152
 153 /* Possible types of events that the inferior handler will have to
 154    deal with.  */
 155 enum inferior_event_type
 156   {
 157     /* There is a request to quit the inferior, abandon it.  */
 158     INF_QUIT_REQ,
 159     /* Process a normal inferior event which will result in target_wait
 160        being called.  */
 161     INF_REG_EVENT,
 162     /* Deal with an error on the inferior.  */
 163     INF_ERROR,
 164     /* We are called because a timer went off.  */
 165     INF_TIMER,
 166     /* We are called to do stuff after the inferior stops.  */
 167     INF_EXEC_COMPLETE,
 168     /* We are called to do some stuff after the inferior stops, but we
 169        are expected to reenter the proceed() and
 170        handle_inferior_event() functions. This is used only in case of
 171        'step n' like commands.  */
 172     INF_EXEC_CONTINUE
 173   };
 174
 175 /* Return the string for a signal.  */
 176 extern char *target_signal_to_string (enum target_signal);
 177
 178 /* Return the name (SIGHUP, etc.) for a signal.  */
 179 extern char *target_signal_to_name (enum target_signal);
 180
 181 /* Given a name (SIGHUP, etc.), return its signal.  */
 182 enum target_signal target_signal_from_name (char *);
 183 \f
 184 /* Target objects which can be transfered using target_read,
 185    target_write, et cetera.  */
 186
 187 enum target_object
 188 {
 189   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 190   TARGET_OBJECT_AVR,
 191   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 192   TARGET_OBJECT_MEMORY,
 193   /* Memory, avoiding GDB's data cache and trusting the executable.
 194      Target implementations of to_xfer_partial never need to handle
 195      this object, and most callers should not use it.  */
 196   TARGET_OBJECT_RAW_MEMORY,
 197   /* Kernel Unwind Table.  See "ia64-tdep.c".  */
 198   TARGET_OBJECT_UNWIND_TABLE,
 199   /* Transfer auxilliary vector.  */
 200   TARGET_OBJECT_AUXV,
 201   /* StackGhost cookie.  See "sparc-tdep.c".  */
 202   TARGET_OBJECT_WCOOKIE,
 203   /* Target memory map in XML format.  */
 204   TARGET_OBJECT_MEMORY_MAP,
 205
 206   /* Possible future objects: TARGET_OBJECT_FILE, TARGET_OBJECT_PROC, ... */
 207 };
 208
 209 /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 210    OBJECT.  The OFFSET, for a seekable object, specifies the
 211    starting point.  The ANNEX can be used to provide additional
 212    data-specific information to the target.
 213
 214    Return the number of bytes actually transfered, or -1 if the
 215    transfer is not supported or otherwise fails.  Return of a positive
 216    value less than LEN indicates that no further transfer is possible.
 217    Unlike the raw to_xfer_partial interface, callers of these
 218    functions do not need to retry partial transfers.  */
 219
 220 extern LONGEST target_read (struct target_ops *ops,
 221                             enum target_object object,
 222                             const char *annex, gdb_byte *buf,
 223                             ULONGEST offset, LONGEST len);
 224
 225 extern LONGEST target_write (struct target_ops *ops,
 226                              enum target_object object,
 227                              const char *annex, const gdb_byte *buf,
 228                              ULONGEST offset, LONGEST len);
 229
 230 /* Similar to target_write, except that it also calls PROGRESS
 231    with the number of bytes written and the opaque BATON after
 232    every partial write.  This is useful for progress reporting
 233    and user interaction while writing data.  To abort the transfer,
 234    the progress callback can throw an exception.  */
 235 LONGEST target_write_with_progress (struct target_ops *ops,
 236                                     enum target_object object,
 237                                     const char *annex, const gdb_byte *buf,
 238                                     ULONGEST offset, LONGEST len,
 239                                     void (*progress) (ULONGEST, void *),
 240                                     void *baton);
 241
 242 /* Wrapper to perform a full read of unknown size.  OBJECT/ANNEX will
 243    be read using OPS.  The return value will be -1 if the transfer
 244    fails or is not supported; 0 if the object is empty; or the length
 245    of the object otherwise.  If a positive value is returned, a
 246    sufficiently large buffer will be allocated using xmalloc and
 247    returned in *BUF_P containing the contents of the object.
 248
 249    This method should be used for objects sufficiently small to store
 250    in a single xmalloc'd buffer, when no fixed bound on the object's
 251    size is known in advance.  Don't try to read TARGET_OBJECT_MEMORY
 252    through this function.  */
 253
 254 extern LONGEST target_read_alloc (struct target_ops *ops,
 255                                   enum target_object object,
 256                                   const char *annex, gdb_byte **buf_p);
 257
 258 /* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and
 259    returned as a string, allocated using xmalloc.  If an error occurs
 260    or the transfer is unsupported, NULL is returned.  Empty objects
 261    are returned as allocated but empty strings.  A warning is issued
 262    if the result contains any embedded NUL bytes.  */
 263
 264 extern char *target_read_stralloc (struct target_ops *ops,
 265                                    enum target_object object,
 266                                    const char *annex);
 267
 268 /* Wrappers to target read/write that perform memory transfers.  They
 269    throw an error if the memory transfer fails.
 270
 271    NOTE: cagney/2003-10-23: The naming schema is lifted from
 272    "frame.h".  The parameter order is lifted from get_frame_memory,
 273    which in turn lifted it from read_memory.  */
 274
 275 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 276                                gdb_byte *buf, LONGEST len);
 277 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 278                                             CORE_ADDR addr, int len);
 279 \f
 280
 281 /* If certain kinds of activity happen, target_wait should perform
 282    callbacks.  */
 283 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 284    on TARGET_ACTIVITY_FD.  */
 285 extern int target_activity_fd;
 286 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 287 extern int (*target_activity_function) (void);
 288 \f
 289 struct thread_info;             /* fwd decl for parameter list below: */
 290
 291 struct target_ops
 292   {
 293     struct target_ops *beneath; /* To the target under this one.  */
 294     char *to_shortname;         /* Name this target type */
 295     char *to_longname;          /* Name for printing */
 296     char *to_doc;               /* Documentation.  Does not include trailing
 297                                    newline, and starts with a one-line descrip-
 298                                    tion (probably similar to to_longname).  */
 299     /* Per-target scratch pad.  */
 300     void *to_data;
 301     /* The open routine takes the rest of the parameters from the
 302        command, and (if successful) pushes a new target onto the
 303        stack.  Targets should supply this routine, if only to provide
 304        an error message.  */
 305     void (*to_open) (char *, int);
 306     /* Old targets with a static target vector provide "to_close".
 307        New re-entrant targets provide "to_xclose" and that is expected
 308        to xfree everything (including the "struct target_ops").  */
 309     void (*to_xclose) (struct target_ops *targ, int quitting);
 310     void (*to_close) (int);
 311     void (*to_attach) (char *, int);
 312     void (*to_post_attach) (int);
 313     void (*to_detach) (char *, int);
 314     void (*to_disconnect) (struct target_ops *, char *, int);
 315     void (*to_resume) (ptid_t, int, enum target_signal);
 316     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 317     void (*to_fetch_registers) (int);
 318     void (*to_store_registers) (int);
 319     void (*to_prepare_to_store) (void);
 320
 321     /* Transfer LEN bytes of memory between GDB address MYADDR and
 322        target address MEMADDR.  If WRITE, transfer them to the target, else
 323        transfer them from the target.  TARGET is the target from which we
 324        get this function.
 325
 326        Return value, N, is one of the following:
 327
 328        0 means that we can't handle this.  If errno has been set, it is the
 329        error which prevented us from doing it (FIXME: What about bfd_error?).
 330
 331        positive (call it N) means that we have transferred N bytes
 332        starting at MEMADDR.  We might be able to handle more bytes
 333        beyond this length, but no promises.
 334
 335        negative (call its absolute value N) means that we cannot
 336        transfer right at MEMADDR, but we could transfer at least
 337        something at MEMADDR + N.
 338
 339        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 340        to_xfer_partial and inferior inheritance.  */
 341
 342     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 343                                    int len, int write,
 344                                    struct mem_attrib *attrib,
 345                                    struct target_ops *target);
 346
 347     void (*to_files_info) (struct target_ops *);
 348     int (*to_insert_breakpoint) (struct bp_target_info *);
 349     int (*to_remove_breakpoint) (struct bp_target_info *);
 350     int (*to_can_use_hw_breakpoint) (int, int, int);
 351     int (*to_insert_hw_breakpoint) (struct bp_target_info *);
 352     int (*to_remove_hw_breakpoint) (struct bp_target_info *);
 353     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 354     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 355     int (*to_stopped_by_watchpoint) (void);
 356     int to_have_continuable_watchpoint;
 357     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 358     int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);
 359     void (*to_terminal_init) (void);
 360     void (*to_terminal_inferior) (void);
 361     void (*to_terminal_ours_for_output) (void);
 362     void (*to_terminal_ours) (void);
 363     void (*to_terminal_save_ours) (void);
 364     void (*to_terminal_info) (char *, int);
 365     void (*to_kill) (void);
 366     void (*to_load) (char *, int);
 367     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 368     void (*to_create_inferior) (char *, char *, char **, int);
 369     void (*to_post_startup_inferior) (ptid_t);
 370     void (*to_acknowledge_created_inferior) (int);
 371     void (*to_insert_fork_catchpoint) (int);
 372     int (*to_remove_fork_catchpoint) (int);
 373     void (*to_insert_vfork_catchpoint) (int);
 374     int (*to_remove_vfork_catchpoint) (int);
 375     int (*to_follow_fork) (struct target_ops *, int);
 376     void (*to_insert_exec_catchpoint) (int);
 377     int (*to_remove_exec_catchpoint) (int);
 378     int (*to_reported_exec_events_per_exec_call) (void);
 379     int (*to_has_exited) (int, int, int *);
 380     void (*to_mourn_inferior) (void);
 381     int (*to_can_run) (void);
 382     void (*to_notice_signals) (ptid_t ptid);
 383     int (*to_thread_alive) (ptid_t ptid);
 384     void (*to_find_new_threads) (void);
 385     char *(*to_pid_to_str) (ptid_t);
 386     char *(*to_extra_thread_info) (struct thread_info *);
 387     void (*to_stop) (void);
 388     void (*to_rcmd) (char *command, struct ui_file *output);
 389     struct symtab_and_line *(*to_enable_exception_callback) (enum
 390                                                              exception_event_kind,
 391                                                              int);
 392     struct exception_event_record *(*to_get_current_exception_event) (void);
 393     char *(*to_pid_to_exec_file) (int pid);
 394     enum strata to_stratum;
 395     int to_has_all_memory;
 396     int to_has_memory;
 397     int to_has_stack;
 398     int to_has_registers;
 399     int to_has_execution;
 400     int to_has_thread_control;  /* control thread execution */
 401     struct section_table
 402      *to_sections;
 403     struct section_table
 404      *to_sections_end;
 405     /* ASYNC target controls */
 406     int (*to_can_async_p) (void);
 407     int (*to_is_async_p) (void);
 408     void (*to_async) (void (*cb) (enum inferior_event_type, void *context),
 409                       void *context);
 410     int to_async_mask_value;
 411     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 412                                             unsigned long,
 413                                             int, int, int,
 414                                             void *),
 415                                    void *);
 416     char * (*to_make_corefile_notes) (bfd *, int *);
 417
 418     /* Return the thread-local address at OFFSET in the
 419        thread-local storage for the thread PTID and the shared library
 420        or executable file given by OBJFILE.  If that block of
 421        thread-local storage hasn't been allocated yet, this function
 422        may return an error.  */
 423     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 424                                               CORE_ADDR load_module_addr,
 425                                               CORE_ADDR offset);
 426
 427     /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 428        OBJECT.  The OFFSET, for a seekable object, specifies the
 429        starting point.  The ANNEX can be used to provide additional
 430        data-specific information to the target.
 431
 432        Return the number of bytes actually transfered, zero when no
 433        further transfer is possible, and -1 when the transfer is not
 434        supported.  Return of a positive value smaller than LEN does
 435        not indicate the end of the object, only the end of the
 436        transfer; higher level code should continue transferring if
 437        desired.  This is handled in target.c.
 438
 439        The interface does not support a "retry" mechanism.  Instead it
 440        assumes that at least one byte will be transfered on each
 441        successful call.
 442
 443        NOTE: cagney/2003-10-17: The current interface can lead to
 444        fragmented transfers.  Lower target levels should not implement
 445        hacks, such as enlarging the transfer, in an attempt to
 446        compensate for this.  Instead, the target stack should be
 447        extended so that it implements supply/collect methods and a
 448        look-aside object cache.  With that available, the lowest
 449        target can safely and freely "push" data up the stack.
 450
 451        See target_read and target_write for more information.  One,
 452        and only one, of readbuf or writebuf must be non-NULL.  */
 453
 454     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 455                                 enum target_object object, const char *annex,
 456                                 gdb_byte *readbuf, const gdb_byte *writebuf,
 457                                 ULONGEST offset, LONGEST len);
 458
 459     /* Returns the memory map for the target.  A return value of NULL
 460        means that no memory map is available.  If a memory address
 461        does not fall within any returned regions, it's assumed to be
 462        RAM.  The returned memory regions should not overlap.
 463
 464        The order of regions does not matter; target_memory_map will
 465        sort regions by starting address. For that reason, this
 466        function should not be called directly except via
 467        target_memory_map.
 468
 469        This method should not cache data; if the memory map could
 470        change unexpectedly, it should be invalidated, and higher
 471        layers will re-fetch it.  */
 472     VEC(mem_region_s) *(*to_memory_map) (struct target_ops *);
 473
 474     int to_magic;
 475     /* Need sub-structure for target machine related rather than comm related?
 476      */
 477   };
 478
 479 /* Magic number for checking ops size.  If a struct doesn't end with this
 480    number, somebody changed the declaration but didn't change all the
 481    places that initialize one.  */
 482
 483 #define OPS_MAGIC       3840
 484
 485 /* The ops structure for our "current" target process.  This should
 486    never be NULL.  If there is no target, it points to the dummy_target.  */
 487
 488 extern struct target_ops current_target;
 489
 490 /* Define easy words for doing these operations on our current target.  */
 491
 492 #define target_shortname        (current_target.to_shortname)
 493 #define target_longname         (current_target.to_longname)
 494
 495 /* Does whatever cleanup is required for a target that we are no
 496    longer going to be calling.  QUITTING indicates that GDB is exiting
 497    and should not get hung on an error (otherwise it is important to
 498    perform clean termination, even if it takes a while).  This routine
 499    is automatically always called when popping the target off the
 500    target stack (to_beneath is undefined).  Closing file descriptors
 501    and freeing all memory allocated memory are typical things it
 502    should do.  */
 503
 504 void target_close (struct target_ops *targ, int quitting);
 505
 506 /* Attaches to a process on the target side.  Arguments are as passed
 507    to the `attach' command by the user.  This routine can be called
 508    when the target is not on the target-stack, if the target_can_run
 509    routine returns 1; in that case, it must push itself onto the stack.
 510    Upon exit, the target should be ready for normal operations, and
 511    should be ready to deliver the status of the process immediately
 512    (without waiting) to an upcoming target_wait call.  */
 513
 514 #define target_attach(args, from_tty)   \
 515      (*current_target.to_attach) (args, from_tty)
 516
 517 /* The target_attach operation places a process under debugger control,
 518    and stops the process.
 519
 520    This operation provides a target-specific hook that allows the
 521    necessary bookkeeping to be performed after an attach completes.  */
 522 #define target_post_attach(pid) \
 523      (*current_target.to_post_attach) (pid)
 524
 525 /* Takes a program previously attached to and detaches it.
 526    The program may resume execution (some targets do, some don't) and will
 527    no longer stop on signals, etc.  We better not have left any breakpoints
 528    in the program or it'll die when it hits one.  ARGS is arguments
 529    typed by the user (e.g. a signal to send the process).  FROM_TTY
 530    says whether to be verbose or not.  */
 531
 532 extern void target_detach (char *, int);
 533
 534 /* Disconnect from the current target without resuming it (leaving it
 535    waiting for a debugger).  */
 536
 537 extern void target_disconnect (char *, int);
 538
 539 /* Resume execution of the target process PTID.  STEP says whether to
 540    single-step or to run free; SIGGNAL is the signal to be given to
 541    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 542    pass TARGET_SIGNAL_DEFAULT.  */
 543
 544 #define target_resume(ptid, step, siggnal)                              \
 545   do {                                                                  \
 546     dcache_invalidate(target_dcache);                                   \
 547     (*current_target.to_resume) (ptid, step, siggnal);                  \
 548   } while (0)
 549
 550 /* Wait for process pid to do something.  PTID = -1 to wait for any
 551    pid to do something.  Return pid of child, or -1 in case of error;
 552    store status through argument pointer STATUS.  Note that it is
 553    _NOT_ OK to throw_exception() out of target_wait() without popping
 554    the debugging target from the stack; GDB isn't prepared to get back
 555    to the prompt with a debugging target but without the frame cache,
 556    stop_pc, etc., set up.  */
 557
 558 #define target_wait(ptid, status)               \
 559      (*current_target.to_wait) (ptid, status)
 560
 561 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 562
 563 #define target_fetch_registers(regno)   \
 564      (*current_target.to_fetch_registers) (regno)
 565
 566 /* Store at least register REGNO, or all regs if REGNO == -1.
 567    It can store as many registers as it wants to, so target_prepare_to_store
 568    must have been previously called.  Calls error() if there are problems.  */
 569
 570 #define target_store_registers(regs)    \
 571      (*current_target.to_store_registers) (regs)
 572
 573 /* Get ready to modify the registers array.  On machines which store
 574    individual registers, this doesn't need to do anything.  On machines
 575    which store all the registers in one fell swoop, this makes sure
 576    that REGISTERS contains all the registers from the program being
 577    debugged.  */
 578
 579 #define target_prepare_to_store()       \
 580      (*current_target.to_prepare_to_store) ()
 581
 582 extern DCACHE *target_dcache;
 583
 584 extern int target_read_string (CORE_ADDR, char **, int, int *);
 585
 586 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 587
 588 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 589                                 int len);
 590
 591 extern int xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 592                         struct mem_attrib *, struct target_ops *);
 593
 594 extern int child_xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 595                               struct mem_attrib *, struct target_ops *);
 596
 597 /* Fetches the target's memory map.  If one is found it is sorted
 598    and returned, after some consistency checking.  Otherwise, NULL
 599    is returned.  */
 600 VEC(mem_region_s) *target_memory_map (void);
 601
 602 extern char *child_pid_to_exec_file (int);
 603
 604 extern char *child_core_file_to_sym_file (char *);
 605
 606 #if defined(CHILD_POST_ATTACH)
 607 extern void child_post_attach (int);
 608 #endif
 609
 610 extern void child_post_startup_inferior (ptid_t);
 611
 612 extern void child_acknowledge_created_inferior (int);
 613
 614 extern void child_insert_fork_catchpoint (int);
 615
 616 extern int child_remove_fork_catchpoint (int);
 617
 618 extern void child_insert_vfork_catchpoint (int);
 619
 620 extern int child_remove_vfork_catchpoint (int);
 621
 622 extern void child_acknowledge_created_inferior (int);
 623
 624 extern int child_follow_fork (struct target_ops *, int);
 625
 626 extern void child_insert_exec_catchpoint (int);
 627
 628 extern int child_remove_exec_catchpoint (int);
 629
 630 extern int child_reported_exec_events_per_exec_call (void);
 631
 632 extern int child_has_exited (int, int, int *);
 633
 634 extern int child_thread_alive (ptid_t);
 635
 636 /* From infrun.c.  */
 637
 638 extern int inferior_has_forked (int pid, int *child_pid);
 639
 640 extern int inferior_has_vforked (int pid, int *child_pid);
 641
 642 extern int inferior_has_execd (int pid, char **execd_pathname);
 643
 644 /* From exec.c */
 645
 646 extern void print_section_info (struct target_ops *, bfd *);
 647
 648 /* Print a line about the current target.  */
 649
 650 #define target_files_info()     \
 651      (*current_target.to_files_info) (&current_target)
 652
 653 /* Insert a breakpoint at address BP_TGT->placed_address in the target
 654    machine.  Result is 0 for success, or an errno value.  */
 655
 656 #define target_insert_breakpoint(bp_tgt)        \
 657      (*current_target.to_insert_breakpoint) (bp_tgt)
 658
 659 /* Remove a breakpoint at address BP_TGT->placed_address in the target
 660    machine.  Result is 0 for success, or an errno value.  */
 661
 662 #define target_remove_breakpoint(bp_tgt)        \
 663      (*current_target.to_remove_breakpoint) (bp_tgt)
 664
 665 /* Initialize the terminal settings we record for the inferior,
 666    before we actually run the inferior.  */
 667
 668 #define target_terminal_init() \
 669      (*current_target.to_terminal_init) ()
 670
 671 /* Put the inferior's terminal settings into effect.
 672    This is preparation for starting or resuming the inferior.  */
 673
 674 #define target_terminal_inferior() \
 675      (*current_target.to_terminal_inferior) ()
 676
 677 /* Put some of our terminal settings into effect,
 678    enough to get proper results from our output,
 679    but do not change into or out of RAW mode
 680    so that no input is discarded.
 681
 682    After doing this, either terminal_ours or terminal_inferior
 683    should be called to get back to a normal state of affairs.  */
 684
 685 #define target_terminal_ours_for_output() \
 686      (*current_target.to_terminal_ours_for_output) ()
 687
 688 /* Put our terminal settings into effect.
 689    First record the inferior's terminal settings
 690    so they can be restored properly later.  */
 691
 692 #define target_terminal_ours() \
 693      (*current_target.to_terminal_ours) ()
 694
 695 /* Save our terminal settings.
 696    This is called from TUI after entering or leaving the curses
 697    mode.  Since curses modifies our terminal this call is here
 698    to take this change into account.  */
 699
 700 #define target_terminal_save_ours() \
 701      (*current_target.to_terminal_save_ours) ()
 702
 703 /* Print useful information about our terminal status, if such a thing
 704    exists.  */
 705
 706 #define target_terminal_info(arg, from_tty) \
 707      (*current_target.to_terminal_info) (arg, from_tty)
 708
 709 /* Kill the inferior process.   Make it go away.  */
 710
 711 #define target_kill() \
 712      (*current_target.to_kill) ()
 713
 714 /* Load an executable file into the target process.  This is expected
 715    to not only bring new code into the target process, but also to
 716    update GDB's symbol tables to match.
 717
 718    ARG contains command-line arguments, to be broken down with
 719    buildargv ().  The first non-switch argument is the filename to
 720    load, FILE; the second is a number (as parsed by strtoul (..., ...,
 721    0)), which is an offset to apply to the load addresses of FILE's
 722    sections.  The target may define switches, or other non-switch
 723    arguments, as it pleases.  */
 724
 725 extern void target_load (char *arg, int from_tty);
 726
 727 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 728    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 729    symbol should be returned.  The result is 0 if successful, nonzero
 730    if the symbol does not exist in the target environment.  This
 731    function should not call error() if communication with the target
 732    is interrupted, since it is called from symbol reading, but should
 733    return nonzero, possibly doing a complain().  */
 734
 735 #define target_lookup_symbol(name, addrp) \
 736      (*current_target.to_lookup_symbol) (name, addrp)
 737
 738 /* Start an inferior process and set inferior_ptid to its pid.
 739    EXEC_FILE is the file to run.
 740    ALLARGS is a string containing the arguments to the program.
 741    ENV is the environment vector to pass.  Errors reported with error().
 742    On VxWorks and various standalone systems, we ignore exec_file.  */
 743
 744 #define target_create_inferior(exec_file, args, env, FROM_TTY)  \
 745      (*current_target.to_create_inferior) (exec_file, args, env, (FROM_TTY))
 746
 747
 748 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 749    notification of inferior events such as fork and vork immediately
 750    after the inferior is created.  (This because of how gdb gets an
 751    inferior created via invoking a shell to do it.  In such a scenario,
 752    if the shell init file has commands in it, the shell will fork and
 753    exec for each of those commands, and we will see each such fork
 754    event.  Very bad.)
 755
 756    Such targets will supply an appropriate definition for this function.  */
 757
 758 #define target_post_startup_inferior(ptid) \
 759      (*current_target.to_post_startup_inferior) (ptid)
 760
 761 /* On some targets, the sequence of starting up an inferior requires
 762    some synchronization between gdb and the new inferior process, PID.  */
 763
 764 #define target_acknowledge_created_inferior(pid) \
 765      (*current_target.to_acknowledge_created_inferior) (pid)
 766
 767 /* On some targets, we can catch an inferior fork or vfork event when
 768    it occurs.  These functions insert/remove an already-created
 769    catchpoint for such events.  */
 770
 771 #define target_insert_fork_catchpoint(pid) \
 772      (*current_target.to_insert_fork_catchpoint) (pid)
 773
 774 #define target_remove_fork_catchpoint(pid) \
 775      (*current_target.to_remove_fork_catchpoint) (pid)
 776
 777 #define target_insert_vfork_catchpoint(pid) \
 778      (*current_target.to_insert_vfork_catchpoint) (pid)
 779
 780 #define target_remove_vfork_catchpoint(pid) \
 781      (*current_target.to_remove_vfork_catchpoint) (pid)
 782
 783 /* If the inferior forks or vforks, this function will be called at
 784    the next resume in order to perform any bookkeeping and fiddling
 785    necessary to continue debugging either the parent or child, as
 786    requested, and releasing the other.  Information about the fork
 787    or vfork event is available via get_last_target_status ().
 788    This function returns 1 if the inferior should not be resumed
 789    (i.e. there is another event pending).  */
 790
 791 int target_follow_fork (int follow_child);
 792
 793 /* On some targets, we can catch an inferior exec event when it
 794    occurs.  These functions insert/remove an already-created
 795    catchpoint for such events.  */
 796
 797 #define target_insert_exec_catchpoint(pid) \
 798      (*current_target.to_insert_exec_catchpoint) (pid)
 799
 800 #define target_remove_exec_catchpoint(pid) \
 801      (*current_target.to_remove_exec_catchpoint) (pid)
 802
 803 /* Returns the number of exec events that are reported when a process
 804    invokes a flavor of the exec() system call on this target, if exec
 805    events are being reported.  */
 806
 807 #define target_reported_exec_events_per_exec_call() \
 808      (*current_target.to_reported_exec_events_per_exec_call) ()
 809
 810 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 811    exit code of PID, if any.  */
 812
 813 #define target_has_exited(pid,wait_status,exit_status) \
 814      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 815
 816 /* The debugger has completed a blocking wait() call.  There is now
 817    some process event that must be processed.  This function should
 818    be defined by those targets that require the debugger to perform
 819    cleanup or internal state changes in response to the process event.  */
 820
 821 /* The inferior process has died.  Do what is right.  */
 822
 823 #define target_mourn_inferior() \
 824      (*current_target.to_mourn_inferior) ()
 825
 826 /* Does target have enough data to do a run or attach command? */
 827
 828 #define target_can_run(t) \
 829      ((t)->to_can_run) ()
 830
 831 /* post process changes to signal handling in the inferior.  */
 832
 833 #define target_notice_signals(ptid) \
 834      (*current_target.to_notice_signals) (ptid)
 835
 836 /* Check to see if a thread is still alive.  */
 837
 838 #define target_thread_alive(ptid) \
 839      (*current_target.to_thread_alive) (ptid)
 840
 841 /* Query for new threads and add them to the thread list.  */
 842
 843 #define target_find_new_threads() \
 844      (*current_target.to_find_new_threads) (); \
 845
 846 /* Make target stop in a continuable fashion.  (For instance, under
 847    Unix, this should act like SIGSTOP).  This function is normally
 848    used by GUIs to implement a stop button.  */
 849
 850 #define target_stop current_target.to_stop
 851
 852 /* Send the specified COMMAND to the target's monitor
 853    (shell,interpreter) for execution.  The result of the query is
 854    placed in OUTBUF.  */
 855
 856 #define target_rcmd(command, outbuf) \
 857      (*current_target.to_rcmd) (command, outbuf)
 858
 859
 860 /* Get the symbol information for a breakpointable routine called when
 861    an exception event occurs.
 862    Intended mainly for C++, and for those
 863    platforms/implementations where such a callback mechanism is available,
 864    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 865    different mechanisms for debugging exceptions.  */
 866
 867 #define target_enable_exception_callback(kind, enable) \
 868      (*current_target.to_enable_exception_callback) (kind, enable)
 869
 870 /* Get the current exception event kind -- throw or catch, etc.  */
 871
 872 #define target_get_current_exception_event() \
 873      (*current_target.to_get_current_exception_event) ()
 874
 875 /* Does the target include all of memory, or only part of it?  This
 876    determines whether we look up the target chain for other parts of
 877    memory if this target can't satisfy a request.  */
 878
 879 #define target_has_all_memory   \
 880      (current_target.to_has_all_memory)
 881
 882 /* Does the target include memory?  (Dummy targets don't.)  */
 883
 884 #define target_has_memory       \
 885      (current_target.to_has_memory)
 886
 887 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 888    we start a process.)  */
 889
 890 #define target_has_stack        \
 891      (current_target.to_has_stack)
 892
 893 /* Does the target have registers?  (Exec files don't.)  */
 894
 895 #define target_has_registers    \
 896      (current_target.to_has_registers)
 897
 898 /* Does the target have execution?  Can we make it jump (through
 899    hoops), or pop its stack a few times?  FIXME: If this is to work that
 900    way, it needs to check whether an inferior actually exists.
 901    remote-udi.c and probably other targets can be the current target
 902    when the inferior doesn't actually exist at the moment.  Right now
 903    this just tells us whether this target is *capable* of execution.  */
 904
 905 #define target_has_execution    \
 906      (current_target.to_has_execution)
 907
 908 /* Can the target support the debugger control of thread execution?
 909    a) Can it lock the thread scheduler?
 910    b) Can it switch the currently running thread?  */
 911
 912 #define target_can_lock_scheduler \
 913      (current_target.to_has_thread_control & tc_schedlock)
 914
 915 #define target_can_switch_threads \
 916      (current_target.to_has_thread_control & tc_switch)
 917
 918 /* Can the target support asynchronous execution? */
 919 #define target_can_async_p() (current_target.to_can_async_p ())
 920
 921 /* Is the target in asynchronous execution mode? */
 922 #define target_is_async_p() (current_target.to_is_async_p())
 923
 924 /* Put the target in async mode with the specified callback function. */
 925 #define target_async(CALLBACK,CONTEXT) \
 926      (current_target.to_async((CALLBACK), (CONTEXT)))
 927
 928 /* This is to be used ONLY within call_function_by_hand(). It provides
 929    a workaround, to have inferior function calls done in sychronous
 930    mode, even though the target is asynchronous. After
 931    target_async_mask(0) is called, calls to target_can_async_p() will
 932    return FALSE , so that target_resume() will not try to start the
 933    target asynchronously. After the inferior stops, we IMMEDIATELY
 934    restore the previous nature of the target, by calling
 935    target_async_mask(1). After that, target_can_async_p() will return
 936    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 937
 938    FIXME ezannoni 1999-12-13: we won't need this once we move
 939    the turning async on and off to the single execution commands,
 940    from where it is done currently, in remote_resume().  */
 941
 942 #define target_async_mask_value \
 943      (current_target.to_async_mask_value)
 944
 945 extern int target_async_mask (int mask);
 946
 947 /* Converts a process id to a string.  Usually, the string just contains
 948    `process xyz', but on some systems it may contain
 949    `process xyz thread abc'.  */
 950
 951 #undef target_pid_to_str
 952 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
 953
 954 #ifndef target_tid_to_str
 955 #define target_tid_to_str(PID) \
 956      target_pid_to_str (PID)
 957 extern char *normal_pid_to_str (ptid_t ptid);
 958 #endif
 959
 960 /* Return a short string describing extra information about PID,
 961    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
 962    is okay.  */
 963
 964 #define target_extra_thread_info(TP) \
 965      (current_target.to_extra_thread_info (TP))
 966
 967 /*
 968  * New Objfile Event Hook:
 969  *
 970  * Sometimes a GDB component wants to get notified whenever a new
 971  * objfile is loaded.  Mainly this is used by thread-debugging
 972  * implementations that need to know when symbols for the target
 973  * thread implemenation are available.
 974  *
 975  * The old way of doing this is to define a macro 'target_new_objfile'
 976  * that points to the function that you want to be called on every
 977  * objfile/shlib load.
 978
 979    The new way is to grab the function pointer,
 980    'deprecated_target_new_objfile_hook', and point it to the function
 981    that you want to be called on every objfile/shlib load.
 982
 983    If multiple clients are willing to be cooperative, they can each
 984    save a pointer to the previous value of
 985    deprecated_target_new_objfile_hook before modifying it, and arrange
 986    for their function to call the previous function in the chain.  In
 987    that way, multiple clients can receive this notification (something
 988    like with signal handlers).  */
 989
 990 extern void (*deprecated_target_new_objfile_hook) (struct objfile *);
 991
 992 #ifndef target_pid_or_tid_to_str
 993 #define target_pid_or_tid_to_str(ID) \
 994      target_pid_to_str (ID)
 995 #endif
 996
 997 /* Attempts to find the pathname of the executable file
 998    that was run to create a specified process.
 999
1000    The process PID must be stopped when this operation is used.
1001
1002    If the executable file cannot be determined, NULL is returned.
1003
1004    Else, a pointer to a character string containing the pathname
1005    is returned.  This string should be copied into a buffer by
1006    the client if the string will not be immediately used, or if
1007    it must persist.  */
1008
1009 #define target_pid_to_exec_file(pid) \
1010      (current_target.to_pid_to_exec_file) (pid)
1011
1012 /*
1013  * Iterator function for target memory regions.
1014  * Calls a callback function once for each memory region 'mapped'
1015  * in the child process.  Defined as a simple macro rather than
1016  * as a function macro so that it can be tested for nullity.
1017  */
1018
1019 #define target_find_memory_regions(FUNC, DATA) \
1020      (current_target.to_find_memory_regions) (FUNC, DATA)
1021
1022 /*
1023  * Compose corefile .note section.
1024  */
1025
1026 #define target_make_corefile_notes(BFD, SIZE_P) \
1027      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1028
1029 /* Thread-local values.  */
1030 #define target_get_thread_local_address \
1031     (current_target.to_get_thread_local_address)
1032 #define target_get_thread_local_address_p() \
1033     (target_get_thread_local_address != NULL)
1034
1035 /* Hook to call target dependent code just after inferior target process has
1036    started.  */
1037
1038 #ifndef TARGET_CREATE_INFERIOR_HOOK
1039 #define TARGET_CREATE_INFERIOR_HOOK(PID)
1040 #endif
1041
1042 /* Hardware watchpoint interfaces.  */
1043
1044 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1045    write).  */
1046
1047 #ifndef STOPPED_BY_WATCHPOINT
1048 #define STOPPED_BY_WATCHPOINT(w) \
1049    (*current_target.to_stopped_by_watchpoint) ()
1050 #endif
1051
1052 /* Non-zero if we have continuable watchpoints  */
1053
1054 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1055 #define HAVE_CONTINUABLE_WATCHPOINT \
1056    (current_target.to_have_continuable_watchpoint)
1057 #endif
1058
1059 /* Provide defaults for hardware watchpoint functions.  */
1060
1061 /* If the *_hw_beakpoint functions have not been defined
1062    elsewhere use the definitions in the target vector.  */
1063
1064 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1065    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1066    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1067    (including this one?).  OTHERTYPE is who knows what...  */
1068
1069 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1070 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1071  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1072 #endif
1073
1074 #ifndef TARGET_REGION_OK_FOR_HW_WATCHPOINT
1075 #define TARGET_REGION_OK_FOR_HW_WATCHPOINT(addr, len) \
1076     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1077 #endif
1078
1079
1080 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1081    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1082    success, non-zero for failure.  */
1083
1084 #ifndef target_insert_watchpoint
1085 #define target_insert_watchpoint(addr, len, type)       \
1086      (*current_target.to_insert_watchpoint) (addr, len, type)
1087
1088 #define target_remove_watchpoint(addr, len, type)       \
1089      (*current_target.to_remove_watchpoint) (addr, len, type)
1090 #endif
1091
1092 #ifndef target_insert_hw_breakpoint
1093 #define target_insert_hw_breakpoint(bp_tgt) \
1094      (*current_target.to_insert_hw_breakpoint) (bp_tgt)
1095
1096 #define target_remove_hw_breakpoint(bp_tgt) \
1097      (*current_target.to_remove_hw_breakpoint) (bp_tgt)
1098 #endif
1099
1100 extern int target_stopped_data_address_p (struct target_ops *);
1101
1102 #ifndef target_stopped_data_address
1103 #define target_stopped_data_address(target, x) \
1104     (*target.to_stopped_data_address) (target, x)
1105 #else
1106 /* Horrible hack to get around existing macros :-(.  */
1107 #define target_stopped_data_address_p(CURRENT_TARGET) (1)
1108 #endif
1109
1110 /* This will only be defined by a target that supports catching vfork events,
1111    such as HP-UX.
1112
1113    On some targets (such as HP-UX 10.20 and earlier), resuming a newly vforked
1114    child process after it has exec'd, causes the parent process to resume as
1115    well.  To prevent the parent from running spontaneously, such targets should
1116    define this to a function that prevents that from happening.  */
1117 #if !defined(ENSURE_VFORKING_PARENT_REMAINS_STOPPED)
1118 #define ENSURE_VFORKING_PARENT_REMAINS_STOPPED(PID) (0)
1119 #endif
1120
1121 /* This will only be defined by a target that supports catching vfork events,
1122    such as HP-UX.
1123
1124    On some targets (such as HP-UX 10.20 and earlier), a newly vforked child
1125    process must be resumed when it delivers its exec event, before the parent
1126    vfork event will be delivered to us.  */
1127
1128 #if !defined(RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK)
1129 #define RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK() (0)
1130 #endif
1131
1132 /* Routines for maintenance of the target structures...
1133
1134    add_target:   Add a target to the list of all possible targets.
1135
1136    push_target:  Make this target the top of the stack of currently used
1137    targets, within its particular stratum of the stack.  Result
1138    is 0 if now atop the stack, nonzero if not on top (maybe
1139    should warn user).
1140
1141    unpush_target: Remove this from the stack of currently used targets,
1142    no matter where it is on the list.  Returns 0 if no
1143    change, 1 if removed from stack.
1144
1145    pop_target:   Remove the top thing on the stack of current targets.  */
1146
1147 extern void add_target (struct target_ops *);
1148
1149 extern int push_target (struct target_ops *);
1150
1151 extern int unpush_target (struct target_ops *);
1152
1153 extern void target_pre_inferior (int);
1154
1155 extern void target_preopen (int);
1156
1157 extern void pop_target (void);
1158
1159 /* Struct section_table maps address ranges to file sections.  It is
1160    mostly used with BFD files, but can be used without (e.g. for handling
1161    raw disks, or files not in formats handled by BFD).  */
1162
1163 struct section_table
1164   {
1165     CORE_ADDR addr;             /* Lowest address in section */
1166     CORE_ADDR endaddr;          /* 1+highest address in section */
1167
1168     struct bfd_section *the_bfd_section;
1169
1170     bfd *bfd;                   /* BFD file pointer */
1171   };
1172
1173 /* Return the "section" containing the specified address.  */
1174 struct section_table *target_section_by_addr (struct target_ops *target,
1175                                               CORE_ADDR addr);
1176
1177
1178 /* From mem-break.c */
1179
1180 extern int memory_remove_breakpoint (struct bp_target_info *);
1181
1182 extern int memory_insert_breakpoint (struct bp_target_info *);
1183
1184 extern int default_memory_remove_breakpoint (struct bp_target_info *);
1185
1186 extern int default_memory_insert_breakpoint (struct bp_target_info *);
1187
1188
1189 /* From target.c */
1190
1191 extern void initialize_targets (void);
1192
1193 extern void noprocess (void);
1194
1195 extern void find_default_attach (char *, int);
1196
1197 extern void find_default_create_inferior (char *, char *, char **, int);
1198
1199 extern struct target_ops *find_run_target (void);
1200
1201 extern struct target_ops *find_core_target (void);
1202
1203 extern struct target_ops *find_target_beneath (struct target_ops *);
1204
1205 extern int target_resize_to_sections (struct target_ops *target,
1206                                       int num_added);
1207
1208 extern void remove_target_sections (bfd *abfd);
1209
1210 \f
1211 /* Stuff that should be shared among the various remote targets.  */
1212
1213 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1214    information (higher values, more information).  */
1215 extern int remote_debug;
1216
1217 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1218 extern int baud_rate;
1219 /* Timeout limit for response from target. */
1220 extern int remote_timeout;
1221
1222 \f
1223 /* Functions for helping to write a native target.  */
1224
1225 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1226 extern void store_waitstatus (struct target_waitstatus *, int);
1227
1228 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1229    targ_signal SIGNO has an equivalent ``host'' representation.  */
1230 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1231    to the shorter target_signal_p() because it is far less ambigious.
1232    In this context ``target_signal'' refers to GDB's internal
1233    representation of the target's set of signals while ``host signal''
1234    refers to the target operating system's signal.  Confused?  */
1235
1236 extern int target_signal_to_host_p (enum target_signal signo);
1237
1238 /* Convert between host signal numbers and enum target_signal's.
1239    target_signal_to_host() returns 0 and prints a warning() on GDB's
1240    console if SIGNO has no equivalent host representation.  */
1241 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1242    refering to the target operating system's signal numbering.
1243    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1244    gdb_signal'' would probably be better as it is refering to GDB's
1245    internal representation of a target operating system's signal.  */
1246
1247 extern enum target_signal target_signal_from_host (int);
1248 extern int target_signal_to_host (enum target_signal);
1249
1250 /* Convert from a number used in a GDB command to an enum target_signal.  */
1251 extern enum target_signal target_signal_from_command (int);
1252
1253 /* Any target can call this to switch to remote protocol (in remote.c). */
1254 extern void push_remote_target (char *name, int from_tty);
1255 \f
1256 /* Imported from machine dependent code */
1257
1258 /* Blank target vector entries are initialized to target_ignore. */
1259 void target_ignore (void);
1260
1261 extern struct target_ops deprecated_child_ops;
1262
1263 #endif /* !defined (TARGET_H) */