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, 1999,
   4    2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
   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 3 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, see <http://www.gnu.org/licenses/>.  */
  23
  24 #if !defined (TARGET_H)
  25 #define TARGET_H
  26
  27 struct objfile;
  28 struct ui_file;
  29 struct mem_attrib;
  30 struct target_ops;
  31 struct bp_target_info;
  32 struct regcache;
  33
  34 /* This include file defines the interface between the main part
  35    of the debugger, and the part which is target-specific, or
  36    specific to the communications interface between us and the
  37    target.
  38
  39    A TARGET is an interface between the debugger and a particular
  40    kind of file or process.  Targets can be STACKED in STRATA,
  41    so that more than one target can potentially respond to a request.
  42    In particular, memory accesses will walk down the stack of targets
  43    until they find a target that is interested in handling that particular
  44    address.  STRATA are artificial boundaries on the stack, within
  45    which particular kinds of targets live.  Strata exist so that
  46    people don't get confused by pushing e.g. a process target and then
  47    a file target, and wondering why they can't see the current values
  48    of variables any more (the file target is handling them and they
  49    never get to the process target).  So when you push a file target,
  50    it goes into the file stratum, which is always below the process
  51    stratum.  */
  52
  53 #include "bfd.h"
  54 #include "symtab.h"
  55 #include "dcache.h"
  56 #include "memattr.h"
  57 #include "vec.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     process_stratum,            /* Executing processes */
  65     thread_stratum              /* Executing threads */
  66   };
  67
  68 enum thread_control_capabilities
  69   {
  70     tc_none = 0,                /* Default: can't control thread execution.  */
  71     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  72     tc_switch = 2               /* Can switch the running thread on demand.  */
  73   };
  74
  75 /* Stuff for target_wait.  */
  76
  77 /* Generally, what has the program done?  */
  78 enum target_waitkind
  79   {
  80     /* The program has exited.  The exit status is in value.integer.  */
  81     TARGET_WAITKIND_EXITED,
  82
  83     /* The program has stopped with a signal.  Which signal is in
  84        value.sig.  */
  85     TARGET_WAITKIND_STOPPED,
  86
  87     /* The program has terminated with a signal.  Which signal is in
  88        value.sig.  */
  89     TARGET_WAITKIND_SIGNALLED,
  90
  91     /* The program is letting us know that it dynamically loaded something
  92        (e.g. it called load(2) on AIX).  */
  93     TARGET_WAITKIND_LOADED,
  94
  95     /* The program has forked.  A "related" process' ID is in
  96        value.related_pid.  I.e., if the child forks, value.related_pid
  97        is the parent's ID.  */
  98
  99     TARGET_WAITKIND_FORKED,
 100
 101     /* The program has vforked.  A "related" process's ID is in
 102        value.related_pid.  */
 103
 104     TARGET_WAITKIND_VFORKED,
 105
 106     /* The program has exec'ed a new executable file.  The new file's
 107        pathname is pointed to by value.execd_pathname.  */
 108
 109     TARGET_WAITKIND_EXECD,
 110
 111     /* The program has entered or returned from a system call.  On
 112        HP-UX, this is used in the hardware watchpoint implementation.
 113        The syscall's unique integer ID number is in value.syscall_id */
 114
 115     TARGET_WAITKIND_SYSCALL_ENTRY,
 116     TARGET_WAITKIND_SYSCALL_RETURN,
 117
 118     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 119        within target_wait, but I'm not sure target_wait should be resuming the
 120        inferior.  */
 121     TARGET_WAITKIND_SPURIOUS,
 122
 123     /* An event has occured, but we should wait again.
 124        Remote_async_wait() returns this when there is an event
 125        on the inferior, but the rest of the world is not interested in
 126        it. The inferior has not stopped, but has just sent some output
 127        to the console, for instance. In this case, we want to go back
 128        to the event loop and wait there for another event from the
 129        inferior, rather than being stuck in the remote_async_wait()
 130        function. This way the event loop is responsive to other events,
 131        like for instance the user typing.  */
 132     TARGET_WAITKIND_IGNORE
 133   };
 134
 135 struct target_waitstatus
 136   {
 137     enum target_waitkind kind;
 138
 139     /* Forked child pid, execd pathname, exit status or signal number.  */
 140     union
 141       {
 142         int integer;
 143         enum target_signal sig;
 144         int related_pid;
 145         char *execd_pathname;
 146         int syscall_id;
 147       }
 148     value;
 149   };
 150
 151 /* Possible types of events that the inferior handler will have to
 152    deal with.  */
 153 enum inferior_event_type
 154   {
 155     /* There is a request to quit the inferior, abandon it.  */
 156     INF_QUIT_REQ,
 157     /* Process a normal inferior event which will result in target_wait
 158        being called.  */
 159     INF_REG_EVENT,
 160     /* Deal with an error on the inferior.  */
 161     INF_ERROR,
 162     /* We are called because a timer went off.  */
 163     INF_TIMER,
 164     /* We are called to do stuff after the inferior stops.  */
 165     INF_EXEC_COMPLETE,
 166     /* We are called to do some stuff after the inferior stops, but we
 167        are expected to reenter the proceed() and
 168        handle_inferior_event() functions. This is used only in case of
 169        'step n' like commands.  */
 170     INF_EXEC_CONTINUE
 171   };
 172
 173 /* Return the string for a signal.  */
 174 extern char *target_signal_to_string (enum target_signal);
 175
 176 /* Return the name (SIGHUP, etc.) for a signal.  */
 177 extern char *target_signal_to_name (enum target_signal);
 178
 179 /* Given a name (SIGHUP, etc.), return its signal.  */
 180 enum target_signal target_signal_from_name (char *);
 181 \f
 182 /* Target objects which can be transfered using target_read,
 183    target_write, et cetera.  */
 184
 185 enum target_object
 186 {
 187   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 188   TARGET_OBJECT_AVR,
 189   /* SPU target specific transfer.  See "spu-tdep.c".  */
 190   TARGET_OBJECT_SPU,
 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   /* Flash memory.  This object can be used to write contents to
 206      a previously erased flash memory.  Using it without erasing
 207      flash can have unexpected results.  Addresses are physical
 208      address on target, and not relative to flash start.  */
 209   TARGET_OBJECT_FLASH,
 210   /* Available target-specific features, e.g. registers and coprocessors.
 211      See "target-descriptions.c".  ANNEX should never be empty.  */
 212   TARGET_OBJECT_AVAILABLE_FEATURES,
 213   /* Currently loaded libraries, in XML format.  */
 214   TARGET_OBJECT_LIBRARIES
 215   /* Possible future objects: TARGET_OBJECT_FILE, TARGET_OBJECT_PROC, ... */
 216 };
 217
 218 /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 219    OBJECT.  The OFFSET, for a seekable object, specifies the
 220    starting point.  The ANNEX can be used to provide additional
 221    data-specific information to the target.
 222
 223    Return the number of bytes actually transfered, or -1 if the
 224    transfer is not supported or otherwise fails.  Return of a positive
 225    value less than LEN indicates that no further transfer is possible.
 226    Unlike the raw to_xfer_partial interface, callers of these
 227    functions do not need to retry partial transfers.  */
 228
 229 extern LONGEST target_read (struct target_ops *ops,
 230                             enum target_object object,
 231                             const char *annex, gdb_byte *buf,
 232                             ULONGEST offset, LONGEST len);
 233
 234 extern LONGEST target_write (struct target_ops *ops,
 235                              enum target_object object,
 236                              const char *annex, const gdb_byte *buf,
 237                              ULONGEST offset, LONGEST len);
 238
 239 /* Similar to target_write, except that it also calls PROGRESS with
 240    the number of bytes written and the opaque BATON after every
 241    successful partial write (and before the first write).  This is
 242    useful for progress reporting and user interaction while writing
 243    data.  To abort the transfer, the progress callback can throw an
 244    exception.  */
 245
 246 LONGEST target_write_with_progress (struct target_ops *ops,
 247                                     enum target_object object,
 248                                     const char *annex, const gdb_byte *buf,
 249                                     ULONGEST offset, LONGEST len,
 250                                     void (*progress) (ULONGEST, void *),
 251                                     void *baton);
 252
 253 /* Wrapper to perform a full read of unknown size.  OBJECT/ANNEX will
 254    be read using OPS.  The return value will be -1 if the transfer
 255    fails or is not supported; 0 if the object is empty; or the length
 256    of the object otherwise.  If a positive value is returned, a
 257    sufficiently large buffer will be allocated using xmalloc and
 258    returned in *BUF_P containing the contents of the object.
 259
 260    This method should be used for objects sufficiently small to store
 261    in a single xmalloc'd buffer, when no fixed bound on the object's
 262    size is known in advance.  Don't try to read TARGET_OBJECT_MEMORY
 263    through this function.  */
 264
 265 extern LONGEST target_read_alloc (struct target_ops *ops,
 266                                   enum target_object object,
 267                                   const char *annex, gdb_byte **buf_p);
 268
 269 /* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and
 270    returned as a string, allocated using xmalloc.  If an error occurs
 271    or the transfer is unsupported, NULL is returned.  Empty objects
 272    are returned as allocated but empty strings.  A warning is issued
 273    if the result contains any embedded NUL bytes.  */
 274
 275 extern char *target_read_stralloc (struct target_ops *ops,
 276                                    enum target_object object,
 277                                    const char *annex);
 278
 279 /* Wrappers to target read/write that perform memory transfers.  They
 280    throw an error if the memory transfer fails.
 281
 282    NOTE: cagney/2003-10-23: The naming schema is lifted from
 283    "frame.h".  The parameter order is lifted from get_frame_memory,
 284    which in turn lifted it from read_memory.  */
 285
 286 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 287                                gdb_byte *buf, LONGEST len);
 288 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 289                                             CORE_ADDR addr, int len);
 290 \f
 291
 292 /* If certain kinds of activity happen, target_wait should perform
 293    callbacks.  */
 294 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 295    on TARGET_ACTIVITY_FD.  */
 296 extern int target_activity_fd;
 297 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 298 extern int (*target_activity_function) (void);
 299 \f
 300 struct thread_info;             /* fwd decl for parameter list below: */
 301
 302 struct target_ops
 303   {
 304     struct target_ops *beneath; /* To the target under this one.  */
 305     char *to_shortname;         /* Name this target type */
 306     char *to_longname;          /* Name for printing */
 307     char *to_doc;               /* Documentation.  Does not include trailing
 308                                    newline, and starts with a one-line descrip-
 309                                    tion (probably similar to to_longname).  */
 310     /* Per-target scratch pad.  */
 311     void *to_data;
 312     /* The open routine takes the rest of the parameters from the
 313        command, and (if successful) pushes a new target onto the
 314        stack.  Targets should supply this routine, if only to provide
 315        an error message.  */
 316     void (*to_open) (char *, int);
 317     /* Old targets with a static target vector provide "to_close".
 318        New re-entrant targets provide "to_xclose" and that is expected
 319        to xfree everything (including the "struct target_ops").  */
 320     void (*to_xclose) (struct target_ops *targ, int quitting);
 321     void (*to_close) (int);
 322     void (*to_attach) (char *, int);
 323     void (*to_post_attach) (int);
 324     void (*to_detach) (char *, int);
 325     void (*to_disconnect) (struct target_ops *, char *, int);
 326     void (*to_resume) (ptid_t, int, enum target_signal);
 327     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 328     void (*to_fetch_registers) (struct regcache *, int);
 329     void (*to_store_registers) (struct regcache *, int);
 330     void (*to_prepare_to_store) (struct regcache *);
 331
 332     /* Transfer LEN bytes of memory between GDB address MYADDR and
 333        target address MEMADDR.  If WRITE, transfer them to the target, else
 334        transfer them from the target.  TARGET is the target from which we
 335        get this function.
 336
 337        Return value, N, is one of the following:
 338
 339        0 means that we can't handle this.  If errno has been set, it is the
 340        error which prevented us from doing it (FIXME: What about bfd_error?).
 341
 342        positive (call it N) means that we have transferred N bytes
 343        starting at MEMADDR.  We might be able to handle more bytes
 344        beyond this length, but no promises.
 345
 346        negative (call its absolute value N) means that we cannot
 347        transfer right at MEMADDR, but we could transfer at least
 348        something at MEMADDR + N.
 349
 350        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 351        to_xfer_partial and inferior inheritance.  */
 352
 353     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 354                                    int len, int write,
 355                                    struct mem_attrib *attrib,
 356                                    struct target_ops *target);
 357
 358     void (*to_files_info) (struct target_ops *);
 359     int (*to_insert_breakpoint) (struct bp_target_info *);
 360     int (*to_remove_breakpoint) (struct bp_target_info *);
 361     int (*to_can_use_hw_breakpoint) (int, int, int);
 362     int (*to_insert_hw_breakpoint) (struct bp_target_info *);
 363     int (*to_remove_hw_breakpoint) (struct bp_target_info *);
 364     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 365     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 366     int (*to_stopped_by_watchpoint) (void);
 367     int to_have_steppable_watchpoint;
 368     int to_have_continuable_watchpoint;
 369     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 370     int (*to_watchpoint_addr_within_range) (struct target_ops *,
 371                                             CORE_ADDR, CORE_ADDR, int);
 372     int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);
 373     void (*to_terminal_init) (void);
 374     void (*to_terminal_inferior) (void);
 375     void (*to_terminal_ours_for_output) (void);
 376     void (*to_terminal_ours) (void);
 377     void (*to_terminal_save_ours) (void);
 378     void (*to_terminal_info) (char *, int);
 379     void (*to_kill) (void);
 380     void (*to_load) (char *, int);
 381     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 382     void (*to_create_inferior) (char *, char *, char **, int);
 383     void (*to_post_startup_inferior) (ptid_t);
 384     void (*to_acknowledge_created_inferior) (int);
 385     void (*to_insert_fork_catchpoint) (int);
 386     int (*to_remove_fork_catchpoint) (int);
 387     void (*to_insert_vfork_catchpoint) (int);
 388     int (*to_remove_vfork_catchpoint) (int);
 389     int (*to_follow_fork) (struct target_ops *, int);
 390     void (*to_insert_exec_catchpoint) (int);
 391     int (*to_remove_exec_catchpoint) (int);
 392     int (*to_has_exited) (int, int, int *);
 393     void (*to_mourn_inferior) (void);
 394     int (*to_can_run) (void);
 395     void (*to_notice_signals) (ptid_t ptid);
 396     int (*to_thread_alive) (ptid_t ptid);
 397     void (*to_find_new_threads) (void);
 398     char *(*to_pid_to_str) (ptid_t);
 399     char *(*to_extra_thread_info) (struct thread_info *);
 400     void (*to_stop) (void);
 401     void (*to_rcmd) (char *command, struct ui_file *output);
 402     char *(*to_pid_to_exec_file) (int pid);
 403     void (*to_log_command) (const char *);
 404     enum strata to_stratum;
 405     int to_has_all_memory;
 406     int to_has_memory;
 407     int to_has_stack;
 408     int to_has_registers;
 409     int to_has_execution;
 410     int to_has_thread_control;  /* control thread execution */
 411     struct section_table
 412      *to_sections;
 413     struct section_table
 414      *to_sections_end;
 415     /* ASYNC target controls */
 416     int (*to_can_async_p) (void);
 417     int (*to_is_async_p) (void);
 418     void (*to_async) (void (*) (enum inferior_event_type, void *), void *);
 419     int (*to_async_mask) (int);
 420     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 421                                             unsigned long,
 422                                             int, int, int,
 423                                             void *),
 424                                    void *);
 425     char * (*to_make_corefile_notes) (bfd *, int *);
 426
 427     /* Return the thread-local address at OFFSET in the
 428        thread-local storage for the thread PTID and the shared library
 429        or executable file given by OBJFILE.  If that block of
 430        thread-local storage hasn't been allocated yet, this function
 431        may return an error.  */
 432     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 433                                               CORE_ADDR load_module_addr,
 434                                               CORE_ADDR offset);
 435
 436     /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 437        OBJECT.  The OFFSET, for a seekable object, specifies the
 438        starting point.  The ANNEX can be used to provide additional
 439        data-specific information to the target.
 440
 441        Return the number of bytes actually transfered, zero when no
 442        further transfer is possible, and -1 when the transfer is not
 443        supported.  Return of a positive value smaller than LEN does
 444        not indicate the end of the object, only the end of the
 445        transfer; higher level code should continue transferring if
 446        desired.  This is handled in target.c.
 447
 448        The interface does not support a "retry" mechanism.  Instead it
 449        assumes that at least one byte will be transfered on each
 450        successful call.
 451
 452        NOTE: cagney/2003-10-17: The current interface can lead to
 453        fragmented transfers.  Lower target levels should not implement
 454        hacks, such as enlarging the transfer, in an attempt to
 455        compensate for this.  Instead, the target stack should be
 456        extended so that it implements supply/collect methods and a
 457        look-aside object cache.  With that available, the lowest
 458        target can safely and freely "push" data up the stack.
 459
 460        See target_read and target_write for more information.  One,
 461        and only one, of readbuf or writebuf must be non-NULL.  */
 462
 463     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 464                                 enum target_object object, const char *annex,
 465                                 gdb_byte *readbuf, const gdb_byte *writebuf,
 466                                 ULONGEST offset, LONGEST len);
 467
 468     /* Returns the memory map for the target.  A return value of NULL
 469        means that no memory map is available.  If a memory address
 470        does not fall within any returned regions, it's assumed to be
 471        RAM.  The returned memory regions should not overlap.
 472
 473        The order of regions does not matter; target_memory_map will
 474        sort regions by starting address. For that reason, this
 475        function should not be called directly except via
 476        target_memory_map.
 477
 478        This method should not cache data; if the memory map could
 479        change unexpectedly, it should be invalidated, and higher
 480        layers will re-fetch it.  */
 481     VEC(mem_region_s) *(*to_memory_map) (struct target_ops *);
 482
 483     /* Erases the region of flash memory starting at ADDRESS, of
 484        length LENGTH.
 485
 486        Precondition: both ADDRESS and ADDRESS+LENGTH should be aligned
 487        on flash block boundaries, as reported by 'to_memory_map'.  */
 488     void (*to_flash_erase) (struct target_ops *,
 489                            ULONGEST address, LONGEST length);
 490
 491     /* Finishes a flash memory write sequence.  After this operation
 492        all flash memory should be available for writing and the result
 493        of reading from areas written by 'to_flash_write' should be
 494        equal to what was written.  */
 495     void (*to_flash_done) (struct target_ops *);
 496
 497     /* Describe the architecture-specific features of this target.
 498        Returns the description found, or NULL if no description
 499        was available.  */
 500     const struct target_desc *(*to_read_description) (struct target_ops *ops);
 501
 502     int to_magic;
 503     /* Need sub-structure for target machine related rather than comm related?
 504      */
 505   };
 506
 507 /* Magic number for checking ops size.  If a struct doesn't end with this
 508    number, somebody changed the declaration but didn't change all the
 509    places that initialize one.  */
 510
 511 #define OPS_MAGIC       3840
 512
 513 /* The ops structure for our "current" target process.  This should
 514    never be NULL.  If there is no target, it points to the dummy_target.  */
 515
 516 extern struct target_ops current_target;
 517
 518 /* Define easy words for doing these operations on our current target.  */
 519
 520 #define target_shortname        (current_target.to_shortname)
 521 #define target_longname         (current_target.to_longname)
 522
 523 /* Does whatever cleanup is required for a target that we are no
 524    longer going to be calling.  QUITTING indicates that GDB is exiting
 525    and should not get hung on an error (otherwise it is important to
 526    perform clean termination, even if it takes a while).  This routine
 527    is automatically always called when popping the target off the
 528    target stack (to_beneath is undefined).  Closing file descriptors
 529    and freeing all memory allocated memory are typical things it
 530    should do.  */
 531
 532 void target_close (struct target_ops *targ, int quitting);
 533
 534 /* Attaches to a process on the target side.  Arguments are as passed
 535    to the `attach' command by the user.  This routine can be called
 536    when the target is not on the target-stack, if the target_can_run
 537    routine returns 1; in that case, it must push itself onto the stack.
 538    Upon exit, the target should be ready for normal operations, and
 539    should be ready to deliver the status of the process immediately
 540    (without waiting) to an upcoming target_wait call.  */
 541
 542 #define target_attach(args, from_tty)   \
 543      (*current_target.to_attach) (args, from_tty)
 544
 545 /* The target_attach operation places a process under debugger control,
 546    and stops the process.
 547
 548    This operation provides a target-specific hook that allows the
 549    necessary bookkeeping to be performed after an attach completes.  */
 550 #define target_post_attach(pid) \
 551      (*current_target.to_post_attach) (pid)
 552
 553 /* Takes a program previously attached to and detaches it.
 554    The program may resume execution (some targets do, some don't) and will
 555    no longer stop on signals, etc.  We better not have left any breakpoints
 556    in the program or it'll die when it hits one.  ARGS is arguments
 557    typed by the user (e.g. a signal to send the process).  FROM_TTY
 558    says whether to be verbose or not.  */
 559
 560 extern void target_detach (char *, int);
 561
 562 /* Disconnect from the current target without resuming it (leaving it
 563    waiting for a debugger).  */
 564
 565 extern void target_disconnect (char *, int);
 566
 567 /* Resume execution of the target process PTID.  STEP says whether to
 568    single-step or to run free; SIGGNAL is the signal to be given to
 569    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 570    pass TARGET_SIGNAL_DEFAULT.  */
 571
 572 #define target_resume(ptid, step, siggnal)                              \
 573   do {                                                                  \
 574     dcache_invalidate(target_dcache);                                   \
 575     (*current_target.to_resume) (ptid, step, siggnal);                  \
 576   } while (0)
 577
 578 /* Wait for process pid to do something.  PTID = -1 to wait for any
 579    pid to do something.  Return pid of child, or -1 in case of error;
 580    store status through argument pointer STATUS.  Note that it is
 581    _NOT_ OK to throw_exception() out of target_wait() without popping
 582    the debugging target from the stack; GDB isn't prepared to get back
 583    to the prompt with a debugging target but without the frame cache,
 584    stop_pc, etc., set up.  */
 585
 586 #define target_wait(ptid, status)               \
 587      (*current_target.to_wait) (ptid, status)
 588
 589 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 590
 591 #define target_fetch_registers(regcache, regno) \
 592      (*current_target.to_fetch_registers) (regcache, regno)
 593
 594 /* Store at least register REGNO, or all regs if REGNO == -1.
 595    It can store as many registers as it wants to, so target_prepare_to_store
 596    must have been previously called.  Calls error() if there are problems.  */
 597
 598 #define target_store_registers(regcache, regs)  \
 599      (*current_target.to_store_registers) (regcache, regs)
 600
 601 /* Get ready to modify the registers array.  On machines which store
 602    individual registers, this doesn't need to do anything.  On machines
 603    which store all the registers in one fell swoop, this makes sure
 604    that REGISTERS contains all the registers from the program being
 605    debugged.  */
 606
 607 #define target_prepare_to_store(regcache)       \
 608      (*current_target.to_prepare_to_store) (regcache)
 609
 610 extern DCACHE *target_dcache;
 611
 612 extern int target_read_string (CORE_ADDR, char **, int, int *);
 613
 614 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 615
 616 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 617                                 int len);
 618
 619 extern int xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 620                         struct mem_attrib *, struct target_ops *);
 621
 622 /* Fetches the target's memory map.  If one is found it is sorted
 623    and returned, after some consistency checking.  Otherwise, NULL
 624    is returned.  */
 625 VEC(mem_region_s) *target_memory_map (void);
 626
 627 /* Erase the specified flash region.  */
 628 void target_flash_erase (ULONGEST address, LONGEST length);
 629
 630 /* Finish a sequence of flash operations.  */
 631 void target_flash_done (void);
 632
 633 /* Describes a request for a memory write operation.  */
 634 struct memory_write_request
 635   {
 636     /* Begining address that must be written. */
 637     ULONGEST begin;
 638     /* Past-the-end address. */
 639     ULONGEST end;
 640     /* The data to write. */
 641     gdb_byte *data;
 642     /* A callback baton for progress reporting for this request.  */
 643     void *baton;
 644   };
 645 typedef struct memory_write_request memory_write_request_s;
 646 DEF_VEC_O(memory_write_request_s);
 647
 648 /* Enumeration specifying different flash preservation behaviour.  */
 649 enum flash_preserve_mode
 650   {
 651     flash_preserve,
 652     flash_discard
 653   };
 654
 655 /* Write several memory blocks at once.  This version can be more
 656    efficient than making several calls to target_write_memory, in
 657    particular because it can optimize accesses to flash memory.
 658
 659    Moreover, this is currently the only memory access function in gdb
 660    that supports writing to flash memory, and it should be used for
 661    all cases where access to flash memory is desirable.
 662
 663    REQUESTS is the vector (see vec.h) of memory_write_request.
 664    PRESERVE_FLASH_P indicates what to do with blocks which must be
 665      erased, but not completely rewritten.
 666    PROGRESS_CB is a function that will be periodically called to provide
 667      feedback to user.  It will be called with the baton corresponding
 668      to the request currently being written.  It may also be called
 669      with a NULL baton, when preserved flash sectors are being rewritten.
 670
 671    The function returns 0 on success, and error otherwise.  */
 672 int target_write_memory_blocks (VEC(memory_write_request_s) *requests,
 673                                 enum flash_preserve_mode preserve_flash_p,
 674                                 void (*progress_cb) (ULONGEST, void *));
 675
 676 /* From infrun.c.  */
 677
 678 extern int inferior_has_forked (int pid, int *child_pid);
 679
 680 extern int inferior_has_vforked (int pid, int *child_pid);
 681
 682 extern int inferior_has_execd (int pid, char **execd_pathname);
 683
 684 /* From exec.c */
 685
 686 extern void print_section_info (struct target_ops *, bfd *);
 687
 688 /* Print a line about the current target.  */
 689
 690 #define target_files_info()     \
 691      (*current_target.to_files_info) (&current_target)
 692
 693 /* Insert a breakpoint at address BP_TGT->placed_address in the target
 694    machine.  Result is 0 for success, or an errno value.  */
 695
 696 #define target_insert_breakpoint(bp_tgt)        \
 697      (*current_target.to_insert_breakpoint) (bp_tgt)
 698
 699 /* Remove a breakpoint at address BP_TGT->placed_address in the target
 700    machine.  Result is 0 for success, or an errno value.  */
 701
 702 #define target_remove_breakpoint(bp_tgt)        \
 703      (*current_target.to_remove_breakpoint) (bp_tgt)
 704
 705 /* Initialize the terminal settings we record for the inferior,
 706    before we actually run the inferior.  */
 707
 708 #define target_terminal_init() \
 709      (*current_target.to_terminal_init) ()
 710
 711 /* Put the inferior's terminal settings into effect.
 712    This is preparation for starting or resuming the inferior.  */
 713
 714 #define target_terminal_inferior() \
 715      (*current_target.to_terminal_inferior) ()
 716
 717 /* Put some of our terminal settings into effect,
 718    enough to get proper results from our output,
 719    but do not change into or out of RAW mode
 720    so that no input is discarded.
 721
 722    After doing this, either terminal_ours or terminal_inferior
 723    should be called to get back to a normal state of affairs.  */
 724
 725 #define target_terminal_ours_for_output() \
 726      (*current_target.to_terminal_ours_for_output) ()
 727
 728 /* Put our terminal settings into effect.
 729    First record the inferior's terminal settings
 730    so they can be restored properly later.  */
 731
 732 #define target_terminal_ours() \
 733      (*current_target.to_terminal_ours) ()
 734
 735 /* Save our terminal settings.
 736    This is called from TUI after entering or leaving the curses
 737    mode.  Since curses modifies our terminal this call is here
 738    to take this change into account.  */
 739
 740 #define target_terminal_save_ours() \
 741      (*current_target.to_terminal_save_ours) ()
 742
 743 /* Print useful information about our terminal status, if such a thing
 744    exists.  */
 745
 746 #define target_terminal_info(arg, from_tty) \
 747      (*current_target.to_terminal_info) (arg, from_tty)
 748
 749 /* Kill the inferior process.   Make it go away.  */
 750
 751 #define target_kill() \
 752      (*current_target.to_kill) ()
 753
 754 /* Load an executable file into the target process.  This is expected
 755    to not only bring new code into the target process, but also to
 756    update GDB's symbol tables to match.
 757
 758    ARG contains command-line arguments, to be broken down with
 759    buildargv ().  The first non-switch argument is the filename to
 760    load, FILE; the second is a number (as parsed by strtoul (..., ...,
 761    0)), which is an offset to apply to the load addresses of FILE's
 762    sections.  The target may define switches, or other non-switch
 763    arguments, as it pleases.  */
 764
 765 extern void target_load (char *arg, int from_tty);
 766
 767 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 768    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 769    symbol should be returned.  The result is 0 if successful, nonzero
 770    if the symbol does not exist in the target environment.  This
 771    function should not call error() if communication with the target
 772    is interrupted, since it is called from symbol reading, but should
 773    return nonzero, possibly doing a complain().  */
 774
 775 #define target_lookup_symbol(name, addrp) \
 776      (*current_target.to_lookup_symbol) (name, addrp)
 777
 778 /* Start an inferior process and set inferior_ptid to its pid.
 779    EXEC_FILE is the file to run.
 780    ALLARGS is a string containing the arguments to the program.
 781    ENV is the environment vector to pass.  Errors reported with error().
 782    On VxWorks and various standalone systems, we ignore exec_file.  */
 783
 784 #define target_create_inferior(exec_file, args, env, FROM_TTY)  \
 785      (*current_target.to_create_inferior) (exec_file, args, env, (FROM_TTY))
 786
 787
 788 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 789    notification of inferior events such as fork and vork immediately
 790    after the inferior is created.  (This because of how gdb gets an
 791    inferior created via invoking a shell to do it.  In such a scenario,
 792    if the shell init file has commands in it, the shell will fork and
 793    exec for each of those commands, and we will see each such fork
 794    event.  Very bad.)
 795
 796    Such targets will supply an appropriate definition for this function.  */
 797
 798 #define target_post_startup_inferior(ptid) \
 799      (*current_target.to_post_startup_inferior) (ptid)
 800
 801 /* On some targets, the sequence of starting up an inferior requires
 802    some synchronization between gdb and the new inferior process, PID.  */
 803
 804 #define target_acknowledge_created_inferior(pid) \
 805      (*current_target.to_acknowledge_created_inferior) (pid)
 806
 807 /* On some targets, we can catch an inferior fork or vfork event when
 808    it occurs.  These functions insert/remove an already-created
 809    catchpoint for such events.  */
 810
 811 #define target_insert_fork_catchpoint(pid) \
 812      (*current_target.to_insert_fork_catchpoint) (pid)
 813
 814 #define target_remove_fork_catchpoint(pid) \
 815      (*current_target.to_remove_fork_catchpoint) (pid)
 816
 817 #define target_insert_vfork_catchpoint(pid) \
 818      (*current_target.to_insert_vfork_catchpoint) (pid)
 819
 820 #define target_remove_vfork_catchpoint(pid) \
 821      (*current_target.to_remove_vfork_catchpoint) (pid)
 822
 823 /* If the inferior forks or vforks, this function will be called at
 824    the next resume in order to perform any bookkeeping and fiddling
 825    necessary to continue debugging either the parent or child, as
 826    requested, and releasing the other.  Information about the fork
 827    or vfork event is available via get_last_target_status ().
 828    This function returns 1 if the inferior should not be resumed
 829    (i.e. there is another event pending).  */
 830
 831 int target_follow_fork (int follow_child);
 832
 833 /* On some targets, we can catch an inferior exec event when it
 834    occurs.  These functions insert/remove an already-created
 835    catchpoint for such events.  */
 836
 837 #define target_insert_exec_catchpoint(pid) \
 838      (*current_target.to_insert_exec_catchpoint) (pid)
 839
 840 #define target_remove_exec_catchpoint(pid) \
 841      (*current_target.to_remove_exec_catchpoint) (pid)
 842
 843 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 844    exit code of PID, if any.  */
 845
 846 #define target_has_exited(pid,wait_status,exit_status) \
 847      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 848
 849 /* The debugger has completed a blocking wait() call.  There is now
 850    some process event that must be processed.  This function should
 851    be defined by those targets that require the debugger to perform
 852    cleanup or internal state changes in response to the process event.  */
 853
 854 /* The inferior process has died.  Do what is right.  */
 855
 856 #define target_mourn_inferior() \
 857      (*current_target.to_mourn_inferior) ()
 858
 859 /* Does target have enough data to do a run or attach command? */
 860
 861 #define target_can_run(t) \
 862      ((t)->to_can_run) ()
 863
 864 /* post process changes to signal handling in the inferior.  */
 865
 866 #define target_notice_signals(ptid) \
 867      (*current_target.to_notice_signals) (ptid)
 868
 869 /* Check to see if a thread is still alive.  */
 870
 871 #define target_thread_alive(ptid) \
 872      (*current_target.to_thread_alive) (ptid)
 873
 874 /* Query for new threads and add them to the thread list.  */
 875
 876 #define target_find_new_threads() \
 877      (*current_target.to_find_new_threads) ()
 878
 879 /* Make target stop in a continuable fashion.  (For instance, under
 880    Unix, this should act like SIGSTOP).  This function is normally
 881    used by GUIs to implement a stop button.  */
 882
 883 #define target_stop current_target.to_stop
 884
 885 /* Send the specified COMMAND to the target's monitor
 886    (shell,interpreter) for execution.  The result of the query is
 887    placed in OUTBUF.  */
 888
 889 #define target_rcmd(command, outbuf) \
 890      (*current_target.to_rcmd) (command, outbuf)
 891
 892
 893 /* Does the target include all of memory, or only part of it?  This
 894    determines whether we look up the target chain for other parts of
 895    memory if this target can't satisfy a request.  */
 896
 897 #define target_has_all_memory   \
 898      (current_target.to_has_all_memory)
 899
 900 /* Does the target include memory?  (Dummy targets don't.)  */
 901
 902 #define target_has_memory       \
 903      (current_target.to_has_memory)
 904
 905 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 906    we start a process.)  */
 907
 908 #define target_has_stack        \
 909      (current_target.to_has_stack)
 910
 911 /* Does the target have registers?  (Exec files don't.)  */
 912
 913 #define target_has_registers    \
 914      (current_target.to_has_registers)
 915
 916 /* Does the target have execution?  Can we make it jump (through
 917    hoops), or pop its stack a few times?  This means that the current
 918    target is currently executing; for some targets, that's the same as
 919    whether or not the target is capable of execution, but there are
 920    also targets which can be current while not executing.  In that
 921    case this will become true after target_create_inferior or
 922    target_attach.  */
 923
 924 #define target_has_execution    \
 925      (current_target.to_has_execution)
 926
 927 /* Can the target support the debugger control of thread execution?
 928    a) Can it lock the thread scheduler?
 929    b) Can it switch the currently running thread?  */
 930
 931 #define target_can_lock_scheduler \
 932      (current_target.to_has_thread_control & tc_schedlock)
 933
 934 #define target_can_switch_threads \
 935      (current_target.to_has_thread_control & tc_switch)
 936
 937 /* Can the target support asynchronous execution? */
 938 #define target_can_async_p() (current_target.to_can_async_p ())
 939
 940 /* Is the target in asynchronous execution mode? */
 941 #define target_is_async_p() (current_target.to_is_async_p ())
 942
 943 /* Put the target in async mode with the specified callback function. */
 944 #define target_async(CALLBACK,CONTEXT) \
 945      (current_target.to_async ((CALLBACK), (CONTEXT)))
 946
 947 /* This is to be used ONLY within call_function_by_hand(). It provides
 948    a workaround, to have inferior function calls done in sychronous
 949    mode, even though the target is asynchronous. After
 950    target_async_mask(0) is called, calls to target_can_async_p() will
 951    return FALSE , so that target_resume() will not try to start the
 952    target asynchronously. After the inferior stops, we IMMEDIATELY
 953    restore the previous nature of the target, by calling
 954    target_async_mask(1). After that, target_can_async_p() will return
 955    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 956
 957    FIXME ezannoni 1999-12-13: we won't need this once we move
 958    the turning async on and off to the single execution commands,
 959    from where it is done currently, in remote_resume().  */
 960
 961 #define target_async_mask(MASK) \
 962   (current_target.to_async_mask (MASK))
 963
 964 /* Converts a process id to a string.  Usually, the string just contains
 965    `process xyz', but on some systems it may contain
 966    `process xyz thread abc'.  */
 967
 968 #undef target_pid_to_str
 969 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
 970
 971 #ifndef target_tid_to_str
 972 #define target_tid_to_str(PID) \
 973      target_pid_to_str (PID)
 974 extern char *normal_pid_to_str (ptid_t ptid);
 975 #endif
 976
 977 /* Return a short string describing extra information about PID,
 978    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
 979    is okay.  */
 980
 981 #define target_extra_thread_info(TP) \
 982      (current_target.to_extra_thread_info (TP))
 983
 984 /* Attempts to find the pathname of the executable file
 985    that was run to create a specified process.
 986
 987    The process PID must be stopped when this operation is used.
 988
 989    If the executable file cannot be determined, NULL is returned.
 990
 991    Else, a pointer to a character string containing the pathname
 992    is returned.  This string should be copied into a buffer by
 993    the client if the string will not be immediately used, or if
 994    it must persist.  */
 995
 996 #define target_pid_to_exec_file(pid) \
 997      (current_target.to_pid_to_exec_file) (pid)
 998
 999 /*
1000  * Iterator function for target memory regions.
1001  * Calls a callback function once for each memory region 'mapped'
1002  * in the child process.  Defined as a simple macro rather than
1003  * as a function macro so that it can be tested for nullity.
1004  */
1005
1006 #define target_find_memory_regions(FUNC, DATA) \
1007      (current_target.to_find_memory_regions) (FUNC, DATA)
1008
1009 /*
1010  * Compose corefile .note section.
1011  */
1012
1013 #define target_make_corefile_notes(BFD, SIZE_P) \
1014      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1015
1016 /* Thread-local values.  */
1017 #define target_get_thread_local_address \
1018     (current_target.to_get_thread_local_address)
1019 #define target_get_thread_local_address_p() \
1020     (target_get_thread_local_address != NULL)
1021
1022
1023 /* Hardware watchpoint interfaces.  */
1024
1025 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1026    write).  */
1027
1028 #ifndef STOPPED_BY_WATCHPOINT
1029 #define STOPPED_BY_WATCHPOINT(w) \
1030    (*current_target.to_stopped_by_watchpoint) ()
1031 #endif
1032
1033 /* Non-zero if we have steppable watchpoints  */
1034
1035 #ifndef HAVE_STEPPABLE_WATCHPOINT
1036 #define HAVE_STEPPABLE_WATCHPOINT \
1037    (current_target.to_have_steppable_watchpoint)
1038 #endif
1039
1040 /* Non-zero if we have continuable watchpoints  */
1041
1042 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1043 #define HAVE_CONTINUABLE_WATCHPOINT \
1044    (current_target.to_have_continuable_watchpoint)
1045 #endif
1046
1047 /* Provide defaults for hardware watchpoint functions.  */
1048
1049 /* If the *_hw_beakpoint functions have not been defined
1050    elsewhere use the definitions in the target vector.  */
1051
1052 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1053    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1054    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1055    (including this one?).  OTHERTYPE is who knows what...  */
1056
1057 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1058 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1059  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1060 #endif
1061
1062 #ifndef TARGET_REGION_OK_FOR_HW_WATCHPOINT
1063 #define TARGET_REGION_OK_FOR_HW_WATCHPOINT(addr, len) \
1064     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1065 #endif
1066
1067
1068 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1069    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1070    success, non-zero for failure.  */
1071
1072 #ifndef target_insert_watchpoint
1073 #define target_insert_watchpoint(addr, len, type)       \
1074      (*current_target.to_insert_watchpoint) (addr, len, type)
1075
1076 #define target_remove_watchpoint(addr, len, type)       \
1077      (*current_target.to_remove_watchpoint) (addr, len, type)
1078 #endif
1079
1080 #ifndef target_insert_hw_breakpoint
1081 #define target_insert_hw_breakpoint(bp_tgt) \
1082      (*current_target.to_insert_hw_breakpoint) (bp_tgt)
1083
1084 #define target_remove_hw_breakpoint(bp_tgt) \
1085      (*current_target.to_remove_hw_breakpoint) (bp_tgt)
1086 #endif
1087
1088 extern int target_stopped_data_address_p (struct target_ops *);
1089
1090 #ifndef target_stopped_data_address
1091 #define target_stopped_data_address(target, x) \
1092     (*target.to_stopped_data_address) (target, x)
1093 #else
1094 /* Horrible hack to get around existing macros :-(.  */
1095 #define target_stopped_data_address_p(CURRENT_TARGET) (1)
1096 #endif
1097
1098 #define target_watchpoint_addr_within_range(target, addr, start, length) \
1099   (*target.to_watchpoint_addr_within_range) (target, addr, start, length)
1100
1101 extern const struct target_desc *target_read_description (struct target_ops *);
1102
1103 /* Command logging facility.  */
1104
1105 #define target_log_command(p)                                           \
1106   do                                                                    \
1107     if (current_target.to_log_command)                                  \
1108       (*current_target.to_log_command) (p);                             \
1109   while (0)
1110
1111 /* Routines for maintenance of the target structures...
1112
1113    add_target:   Add a target to the list of all possible targets.
1114
1115    push_target:  Make this target the top of the stack of currently used
1116    targets, within its particular stratum of the stack.  Result
1117    is 0 if now atop the stack, nonzero if not on top (maybe
1118    should warn user).
1119
1120    unpush_target: Remove this from the stack of currently used targets,
1121    no matter where it is on the list.  Returns 0 if no
1122    change, 1 if removed from stack.
1123
1124    pop_target:   Remove the top thing on the stack of current targets.  */
1125
1126 extern void add_target (struct target_ops *);
1127
1128 extern int push_target (struct target_ops *);
1129
1130 extern int unpush_target (struct target_ops *);
1131
1132 extern void target_pre_inferior (int);
1133
1134 extern void target_preopen (int);
1135
1136 extern void pop_target (void);
1137
1138 extern CORE_ADDR target_translate_tls_address (struct objfile *objfile,
1139                                                CORE_ADDR offset);
1140
1141 /* Mark a pushed target as running or exited, for targets which do not
1142    automatically pop when not active.  */
1143
1144 void target_mark_running (struct target_ops *);
1145
1146 void target_mark_exited (struct target_ops *);
1147
1148 /* Struct section_table maps address ranges to file sections.  It is
1149    mostly used with BFD files, but can be used without (e.g. for handling
1150    raw disks, or files not in formats handled by BFD).  */
1151
1152 struct section_table
1153   {
1154     CORE_ADDR addr;             /* Lowest address in section */
1155     CORE_ADDR endaddr;          /* 1+highest address in section */
1156
1157     struct bfd_section *the_bfd_section;
1158
1159     bfd *bfd;                   /* BFD file pointer */
1160   };
1161
1162 /* Return the "section" containing the specified address.  */
1163 struct section_table *target_section_by_addr (struct target_ops *target,
1164                                               CORE_ADDR addr);
1165
1166
1167 /* From mem-break.c */
1168
1169 extern int memory_remove_breakpoint (struct bp_target_info *);
1170
1171 extern int memory_insert_breakpoint (struct bp_target_info *);
1172
1173 extern int default_memory_remove_breakpoint (struct gdbarch *, struct bp_target_info *);
1174
1175 extern int default_memory_insert_breakpoint (struct gdbarch *, struct bp_target_info *);
1176
1177
1178 /* From target.c */
1179
1180 extern void initialize_targets (void);
1181
1182 extern void noprocess (void);
1183
1184 extern void target_require_runnable (void);
1185
1186 extern void find_default_attach (char *, int);
1187
1188 extern void find_default_create_inferior (char *, char *, char **, int);
1189
1190 extern struct target_ops *find_run_target (void);
1191
1192 extern struct target_ops *find_core_target (void);
1193
1194 extern struct target_ops *find_target_beneath (struct target_ops *);
1195
1196 extern int target_resize_to_sections (struct target_ops *target,
1197                                       int num_added);
1198
1199 extern void remove_target_sections (bfd *abfd);
1200
1201 \f
1202 /* Stuff that should be shared among the various remote targets.  */
1203
1204 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1205    information (higher values, more information).  */
1206 extern int remote_debug;
1207
1208 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1209 extern int baud_rate;
1210 /* Timeout limit for response from target. */
1211 extern int remote_timeout;
1212
1213 \f
1214 /* Functions for helping to write a native target.  */
1215
1216 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1217 extern void store_waitstatus (struct target_waitstatus *, int);
1218
1219 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1220    targ_signal SIGNO has an equivalent ``host'' representation.  */
1221 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1222    to the shorter target_signal_p() because it is far less ambigious.
1223    In this context ``target_signal'' refers to GDB's internal
1224    representation of the target's set of signals while ``host signal''
1225    refers to the target operating system's signal.  Confused?  */
1226
1227 extern int target_signal_to_host_p (enum target_signal signo);
1228
1229 /* Convert between host signal numbers and enum target_signal's.
1230    target_signal_to_host() returns 0 and prints a warning() on GDB's
1231    console if SIGNO has no equivalent host representation.  */
1232 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1233    refering to the target operating system's signal numbering.
1234    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1235    gdb_signal'' would probably be better as it is refering to GDB's
1236    internal representation of a target operating system's signal.  */
1237
1238 extern enum target_signal target_signal_from_host (int);
1239 extern int target_signal_to_host (enum target_signal);
1240
1241 extern enum target_signal default_target_signal_from_host (struct gdbarch *,
1242                                                            int);
1243 extern int default_target_signal_to_host (struct gdbarch *,
1244                                           enum target_signal);
1245
1246 /* Convert from a number used in a GDB command to an enum target_signal.  */
1247 extern enum target_signal target_signal_from_command (int);
1248
1249 /* Any target can call this to switch to remote protocol (in remote.c). */
1250 extern void push_remote_target (char *name, int from_tty);
1251
1252 /* Set the show memory breakpoints mode to show, and installs a cleanup
1253    to restore it back to the current value.  */
1254 extern struct cleanup *make_show_memory_breakpoints_cleanup (int show);
1255
1256 \f
1257 /* Imported from machine dependent code */
1258
1259 /* Blank target vector entries are initialized to target_ignore. */
1260 void target_ignore (void);
1261
1262 extern struct target_ops deprecated_child_ops;
1263
1264 #endif /* !defined (TARGET_H) */