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