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     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   /* SPU target specific transfer.  See "spu-tdep.c".  */
 191   TARGET_OBJECT_SPU,
 192   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 193   TARGET_OBJECT_MEMORY,
 194   /* Memory, avoiding GDB's data cache and trusting the executable.
 195      Target implementations of to_xfer_partial never need to handle
 196      this object, and most callers should not use it.  */
 197   TARGET_OBJECT_RAW_MEMORY,
 198   /* Kernel Unwind Table.  See "ia64-tdep.c".  */
 199   TARGET_OBJECT_UNWIND_TABLE,
 200   /* Transfer auxilliary vector.  */
 201   TARGET_OBJECT_AUXV,
 202   /* StackGhost cookie.  See "sparc-tdep.c".  */
 203   TARGET_OBJECT_WCOOKIE,
 204   /* Target memory map in XML format.  */
 205   TARGET_OBJECT_MEMORY_MAP,
 206   /* Flash memory.  This object can be used to write contents to
 207      a previously erased flash memory.  Using it without erasing
 208      flash can have unexpected results.  Addresses are physical
 209      address on target, and not relative to flash start.  */
 210   TARGET_OBJECT_FLASH,
 211   /* Available target-specific features, e.g. registers and coprocessors.
 212      See "target-descriptions.c".  ANNEX should never be empty.  */
 213   TARGET_OBJECT_AVAILABLE_FEATURES,
 214   /* Currently loaded libraries, in XML format.  */
 215   TARGET_OBJECT_LIBRARIES
 216   /* Possible future objects: TARGET_OBJECT_FILE, TARGET_OBJECT_PROC, ... */
 217 };
 218
 219 /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 220    OBJECT.  The OFFSET, for a seekable object, specifies the
 221    starting point.  The ANNEX can be used to provide additional
 222    data-specific information to the target.
 223
 224    Return the number of bytes actually transfered, or -1 if the
 225    transfer is not supported or otherwise fails.  Return of a positive
 226    value less than LEN indicates that no further transfer is possible.
 227    Unlike the raw to_xfer_partial interface, callers of these
 228    functions do not need to retry partial transfers.  */
 229
 230 extern LONGEST target_read (struct target_ops *ops,
 231                             enum target_object object,
 232                             const char *annex, gdb_byte *buf,
 233                             ULONGEST offset, LONGEST len);
 234
 235 extern LONGEST target_write (struct target_ops *ops,
 236                              enum target_object object,
 237                              const char *annex, const gdb_byte *buf,
 238                              ULONGEST offset, LONGEST len);
 239
 240 /* Similar to target_write, except that it also calls PROGRESS with
 241    the number of bytes written and the opaque BATON after every
 242    successful partial write (and before the first write).  This is
 243    useful for progress reporting and user interaction while writing
 244    data.  To abort the transfer, the progress callback can throw an
 245    exception.  */
 246
 247 LONGEST target_write_with_progress (struct target_ops *ops,
 248                                     enum target_object object,
 249                                     const char *annex, const gdb_byte *buf,
 250                                     ULONGEST offset, LONGEST len,
 251                                     void (*progress) (ULONGEST, void *),
 252                                     void *baton);
 253
 254 /* Wrapper to perform a full read of unknown size.  OBJECT/ANNEX will
 255    be read using OPS.  The return value will be -1 if the transfer
 256    fails or is not supported; 0 if the object is empty; or the length
 257    of the object otherwise.  If a positive value is returned, a
 258    sufficiently large buffer will be allocated using xmalloc and
 259    returned in *BUF_P containing the contents of the object.
 260
 261    This method should be used for objects sufficiently small to store
 262    in a single xmalloc'd buffer, when no fixed bound on the object's
 263    size is known in advance.  Don't try to read TARGET_OBJECT_MEMORY
 264    through this function.  */
 265
 266 extern LONGEST target_read_alloc (struct target_ops *ops,
 267                                   enum target_object object,
 268                                   const char *annex, gdb_byte **buf_p);
 269
 270 /* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and
 271    returned as a string, allocated using xmalloc.  If an error occurs
 272    or the transfer is unsupported, NULL is returned.  Empty objects
 273    are returned as allocated but empty strings.  A warning is issued
 274    if the result contains any embedded NUL bytes.  */
 275
 276 extern char *target_read_stralloc (struct target_ops *ops,
 277                                    enum target_object object,
 278                                    const char *annex);
 279
 280 /* Wrappers to target read/write that perform memory transfers.  They
 281    throw an error if the memory transfer fails.
 282
 283    NOTE: cagney/2003-10-23: The naming schema is lifted from
 284    "frame.h".  The parameter order is lifted from get_frame_memory,
 285    which in turn lifted it from read_memory.  */
 286
 287 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 288                                gdb_byte *buf, LONGEST len);
 289 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 290                                             CORE_ADDR addr, int len);
 291 \f
 292
 293 /* If certain kinds of activity happen, target_wait should perform
 294    callbacks.  */
 295 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 296    on TARGET_ACTIVITY_FD.  */
 297 extern int target_activity_fd;
 298 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 299 extern int (*target_activity_function) (void);
 300 \f
 301 struct thread_info;             /* fwd decl for parameter list below: */
 302
 303 struct target_ops
 304   {
 305     struct target_ops *beneath; /* To the target under this one.  */
 306     char *to_shortname;         /* Name this target type */
 307     char *to_longname;          /* Name for printing */
 308     char *to_doc;               /* Documentation.  Does not include trailing
 309                                    newline, and starts with a one-line descrip-
 310                                    tion (probably similar to to_longname).  */
 311     /* Per-target scratch pad.  */
 312     void *to_data;
 313     /* The open routine takes the rest of the parameters from the
 314        command, and (if successful) pushes a new target onto the
 315        stack.  Targets should supply this routine, if only to provide
 316        an error message.  */
 317     void (*to_open) (char *, int);
 318     /* Old targets with a static target vector provide "to_close".
 319        New re-entrant targets provide "to_xclose" and that is expected
 320        to xfree everything (including the "struct target_ops").  */
 321     void (*to_xclose) (struct target_ops *targ, int quitting);
 322     void (*to_close) (int);
 323     void (*to_attach) (char *, int);
 324     void (*to_post_attach) (int);
 325     void (*to_detach) (char *, int);
 326     void (*to_disconnect) (struct target_ops *, char *, int);
 327     void (*to_resume) (ptid_t, int, enum target_signal);
 328     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 329     void (*to_fetch_registers) (struct regcache *, int);
 330     void (*to_store_registers) (struct regcache *, int);
 331     void (*to_prepare_to_store) (struct regcache *);
 332
 333     /* Transfer LEN bytes of memory between GDB address MYADDR and
 334        target address MEMADDR.  If WRITE, transfer them to the target, else
 335        transfer them from the target.  TARGET is the target from which we
 336        get this function.
 337
 338        Return value, N, is one of the following:
 339
 340        0 means that we can't handle this.  If errno has been set, it is the
 341        error which prevented us from doing it (FIXME: What about bfd_error?).
 342
 343        positive (call it N) means that we have transferred N bytes
 344        starting at MEMADDR.  We might be able to handle more bytes
 345        beyond this length, but no promises.
 346
 347        negative (call its absolute value N) means that we cannot
 348        transfer right at MEMADDR, but we could transfer at least
 349        something at MEMADDR + N.
 350
 351        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 352        to_xfer_partial and inferior inheritance.  */
 353
 354     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 355                                    int len, int write,
 356                                    struct mem_attrib *attrib,
 357                                    struct target_ops *target);
 358
 359     void (*to_files_info) (struct target_ops *);
 360     int (*to_insert_breakpoint) (struct bp_target_info *);
 361     int (*to_remove_breakpoint) (struct bp_target_info *);
 362     int (*to_can_use_hw_breakpoint) (int, int, int);
 363     int (*to_insert_hw_breakpoint) (struct bp_target_info *);
 364     int (*to_remove_hw_breakpoint) (struct bp_target_info *);
 365     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 366     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 367     int (*to_stopped_by_watchpoint) (void);
 368     int to_have_steppable_watchpoint;
 369     int to_have_continuable_watchpoint;
 370     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 371     int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);
 372     void (*to_terminal_init) (void);
 373     void (*to_terminal_inferior) (void);
 374     void (*to_terminal_ours_for_output) (void);
 375     void (*to_terminal_ours) (void);
 376     void (*to_terminal_save_ours) (void);
 377     void (*to_terminal_info) (char *, int);
 378     void (*to_kill) (void);
 379     void (*to_load) (char *, int);
 380     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 381     void (*to_create_inferior) (char *, char *, char **, int);
 382     void (*to_post_startup_inferior) (ptid_t);
 383     void (*to_acknowledge_created_inferior) (int);
 384     void (*to_insert_fork_catchpoint) (int);
 385     int (*to_remove_fork_catchpoint) (int);
 386     void (*to_insert_vfork_catchpoint) (int);
 387     int (*to_remove_vfork_catchpoint) (int);
 388     int (*to_follow_fork) (struct target_ops *, int);
 389     void (*to_insert_exec_catchpoint) (int);
 390     int (*to_remove_exec_catchpoint) (int);
 391     int (*to_reported_exec_events_per_exec_call) (void);
 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 (*cb) (enum inferior_event_type, void *context),
 419                       void *context);
 420     int to_async_mask_value;
 421     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 422                                             unsigned long,
 423                                             int, int, int,
 424                                             void *),
 425                                    void *);
 426     char * (*to_make_corefile_notes) (bfd *, int *);
 427
 428     /* Return the thread-local address at OFFSET in the
 429        thread-local storage for the thread PTID and the shared library
 430        or executable file given by OBJFILE.  If that block of
 431        thread-local storage hasn't been allocated yet, this function
 432        may return an error.  */
 433     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 434                                               CORE_ADDR load_module_addr,
 435                                               CORE_ADDR offset);
 436
 437     /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 438        OBJECT.  The OFFSET, for a seekable object, specifies the
 439        starting point.  The ANNEX can be used to provide additional
 440        data-specific information to the target.
 441
 442        Return the number of bytes actually transfered, zero when no
 443        further transfer is possible, and -1 when the transfer is not
 444        supported.  Return of a positive value smaller than LEN does
 445        not indicate the end of the object, only the end of the
 446        transfer; higher level code should continue transferring if
 447        desired.  This is handled in target.c.
 448
 449        The interface does not support a "retry" mechanism.  Instead it
 450        assumes that at least one byte will be transfered on each
 451        successful call.
 452
 453        NOTE: cagney/2003-10-17: The current interface can lead to
 454        fragmented transfers.  Lower target levels should not implement
 455        hacks, such as enlarging the transfer, in an attempt to
 456        compensate for this.  Instead, the target stack should be
 457        extended so that it implements supply/collect methods and a
 458        look-aside object cache.  With that available, the lowest
 459        target can safely and freely "push" data up the stack.
 460
 461        See target_read and target_write for more information.  One,
 462        and only one, of readbuf or writebuf must be non-NULL.  */
 463
 464     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 465                                 enum target_object object, const char *annex,
 466                                 gdb_byte *readbuf, const gdb_byte *writebuf,
 467                                 ULONGEST offset, LONGEST len);
 468
 469     /* Returns the memory map for the target.  A return value of NULL
 470        means that no memory map is available.  If a memory address
 471        does not fall within any returned regions, it's assumed to be
 472        RAM.  The returned memory regions should not overlap.
 473
 474        The order of regions does not matter; target_memory_map will
 475        sort regions by starting address. For that reason, this
 476        function should not be called directly except via
 477        target_memory_map.
 478
 479        This method should not cache data; if the memory map could
 480        change unexpectedly, it should be invalidated, and higher
 481        layers will re-fetch it.  */
 482     VEC(mem_region_s) *(*to_memory_map) (struct target_ops *);
 483
 484     /* Erases the region of flash memory starting at ADDRESS, of
 485        length LENGTH.
 486
 487        Precondition: both ADDRESS and ADDRESS+LENGTH should be aligned
 488        on flash block boundaries, as reported by 'to_memory_map'.  */
 489     void (*to_flash_erase) (struct target_ops *,
 490                            ULONGEST address, LONGEST length);
 491
 492     /* Finishes a flash memory write sequence.  After this operation
 493        all flash memory should be available for writing and the result
 494        of reading from areas written by 'to_flash_write' should be
 495        equal to what was written.  */
 496     void (*to_flash_done) (struct target_ops *);
 497
 498     /* Describe the architecture-specific features of this target.
 499        Returns the description found, or NULL if no description
 500        was available.  */
 501     const struct target_desc *(*to_read_description) (struct target_ops *ops);
 502
 503     int to_magic;
 504     /* Need sub-structure for target machine related rather than comm related?
 505      */
 506   };
 507
 508 /* Magic number for checking ops size.  If a struct doesn't end with this
 509    number, somebody changed the declaration but didn't change all the
 510    places that initialize one.  */
 511
 512 #define OPS_MAGIC       3840
 513
 514 /* The ops structure for our "current" target process.  This should
 515    never be NULL.  If there is no target, it points to the dummy_target.  */
 516
 517 extern struct target_ops current_target;
 518
 519 /* Define easy words for doing these operations on our current target.  */
 520
 521 #define target_shortname        (current_target.to_shortname)
 522 #define target_longname         (current_target.to_longname)
 523
 524 /* Does whatever cleanup is required for a target that we are no
 525    longer going to be calling.  QUITTING indicates that GDB is exiting
 526    and should not get hung on an error (otherwise it is important to
 527    perform clean termination, even if it takes a while).  This routine
 528    is automatically always called when popping the target off the
 529    target stack (to_beneath is undefined).  Closing file descriptors
 530    and freeing all memory allocated memory are typical things it
 531    should do.  */
 532
 533 void target_close (struct target_ops *targ, int quitting);
 534
 535 /* Attaches to a process on the target side.  Arguments are as passed
 536    to the `attach' command by the user.  This routine can be called
 537    when the target is not on the target-stack, if the target_can_run
 538    routine returns 1; in that case, it must push itself onto the stack.
 539    Upon exit, the target should be ready for normal operations, and
 540    should be ready to deliver the status of the process immediately
 541    (without waiting) to an upcoming target_wait call.  */
 542
 543 #define target_attach(args, from_tty)   \
 544      (*current_target.to_attach) (args, from_tty)
 545
 546 /* The target_attach operation places a process under debugger control,
 547    and stops the process.
 548
 549    This operation provides a target-specific hook that allows the
 550    necessary bookkeeping to be performed after an attach completes.  */
 551 #define target_post_attach(pid) \
 552      (*current_target.to_post_attach) (pid)
 553
 554 /* Takes a program previously attached to and detaches it.
 555    The program may resume execution (some targets do, some don't) and will
 556    no longer stop on signals, etc.  We better not have left any breakpoints
 557    in the program or it'll die when it hits one.  ARGS is arguments
 558    typed by the user (e.g. a signal to send the process).  FROM_TTY
 559    says whether to be verbose or not.  */
 560
 561 extern void target_detach (char *, int);
 562
 563 /* Disconnect from the current target without resuming it (leaving it
 564    waiting for a debugger).  */
 565
 566 extern void target_disconnect (char *, int);
 567
 568 /* Resume execution of the target process PTID.  STEP says whether to
 569    single-step or to run free; SIGGNAL is the signal to be given to
 570    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 571    pass TARGET_SIGNAL_DEFAULT.  */
 572
 573 #define target_resume(ptid, step, siggnal)                              \
 574   do {                                                                  \
 575     dcache_invalidate(target_dcache);                                   \
 576     (*current_target.to_resume) (ptid, step, siggnal);                  \
 577   } while (0)
 578
 579 /* Wait for process pid to do something.  PTID = -1 to wait for any
 580    pid to do something.  Return pid of child, or -1 in case of error;
 581    store status through argument pointer STATUS.  Note that it is
 582    _NOT_ OK to throw_exception() out of target_wait() without popping
 583    the debugging target from the stack; GDB isn't prepared to get back
 584    to the prompt with a debugging target but without the frame cache,
 585    stop_pc, etc., set up.  */
 586
 587 #define target_wait(ptid, status)               \
 588      (*current_target.to_wait) (ptid, status)
 589
 590 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 591
 592 #define target_fetch_registers(regcache, regno) \
 593      (*current_target.to_fetch_registers) (regcache, regno)
 594
 595 /* Store at least register REGNO, or all regs if REGNO == -1.
 596    It can store as many registers as it wants to, so target_prepare_to_store
 597    must have been previously called.  Calls error() if there are problems.  */
 598
 599 #define target_store_registers(regcache, regs)  \
 600      (*current_target.to_store_registers) (regcache, regs)
 601
 602 /* Get ready to modify the registers array.  On machines which store
 603    individual registers, this doesn't need to do anything.  On machines
 604    which store all the registers in one fell swoop, this makes sure
 605    that REGISTERS contains all the registers from the program being
 606    debugged.  */
 607
 608 #define target_prepare_to_store(regcache)       \
 609      (*current_target.to_prepare_to_store) (regcache)
 610
 611 extern DCACHE *target_dcache;
 612
 613 extern int target_read_string (CORE_ADDR, char **, int, int *);
 614
 615 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 616
 617 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 618                                 int len);
 619
 620 extern int xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 621                         struct mem_attrib *, struct target_ops *);
 622
 623 /* Fetches the target's memory map.  If one is found it is sorted
 624    and returned, after some consistency checking.  Otherwise, NULL
 625    is returned.  */
 626 VEC(mem_region_s) *target_memory_map (void);
 627
 628 /* Erase the specified flash region.  */
 629 void target_flash_erase (ULONGEST address, LONGEST length);
 630
 631 /* Finish a sequence of flash operations.  */
 632 void target_flash_done (void);
 633
 634 /* Describes a request for a memory write operation.  */
 635 struct memory_write_request
 636   {
 637     /* Begining address that must be written. */
 638     ULONGEST begin;
 639     /* Past-the-end address. */
 640     ULONGEST end;
 641     /* The data to write. */
 642     gdb_byte *data;
 643     /* A callback baton for progress reporting for this request.  */
 644     void *baton;
 645   };
 646 typedef struct memory_write_request memory_write_request_s;
 647 DEF_VEC_O(memory_write_request_s);
 648
 649 /* Enumeration specifying different flash preservation behaviour.  */
 650 enum flash_preserve_mode
 651   {
 652     flash_preserve,
 653     flash_discard
 654   };
 655
 656 /* Write several memory blocks at once.  This version can be more
 657    efficient than making several calls to target_write_memory, in
 658    particular because it can optimize accesses to flash memory.
 659
 660    Moreover, this is currently the only memory access function in gdb
 661    that supports writing to flash memory, and it should be used for
 662    all cases where access to flash memory is desirable.
 663
 664    REQUESTS is the vector (see vec.h) of memory_write_request.
 665    PRESERVE_FLASH_P indicates what to do with blocks which must be
 666      erased, but not completely rewritten.
 667    PROGRESS_CB is a function that will be periodically called to provide
 668      feedback to user.  It will be called with the baton corresponding
 669      to the request currently being written.  It may also be called
 670      with a NULL baton, when preserved flash sectors are being rewritten.
 671
 672    The function returns 0 on success, and error otherwise.  */
 673 int target_write_memory_blocks (VEC(memory_write_request_s) *requests,
 674                                 enum flash_preserve_mode preserve_flash_p,
 675                                 void (*progress_cb) (ULONGEST, void *));
 676
 677 /* From infrun.c.  */
 678
 679 extern int inferior_has_forked (int pid, int *child_pid);
 680
 681 extern int inferior_has_vforked (int pid, int *child_pid);
 682
 683 extern int inferior_has_execd (int pid, char **execd_pathname);
 684
 685 /* From exec.c */
 686
 687 extern void print_section_info (struct target_ops *, bfd *);
 688
 689 /* Print a line about the current target.  */
 690
 691 #define target_files_info()     \
 692      (*current_target.to_files_info) (&current_target)
 693
 694 /* Insert a breakpoint at address BP_TGT->placed_address in the target
 695    machine.  Result is 0 for success, or an errno value.  */
 696
 697 #define target_insert_breakpoint(bp_tgt)        \
 698      (*current_target.to_insert_breakpoint) (bp_tgt)
 699
 700 /* Remove a breakpoint at address BP_TGT->placed_address in the target
 701    machine.  Result is 0 for success, or an errno value.  */
 702
 703 #define target_remove_breakpoint(bp_tgt)        \
 704      (*current_target.to_remove_breakpoint) (bp_tgt)
 705
 706 /* Initialize the terminal settings we record for the inferior,
 707    before we actually run the inferior.  */
 708
 709 #define target_terminal_init() \
 710      (*current_target.to_terminal_init) ()
 711
 712 /* Put the inferior's terminal settings into effect.
 713    This is preparation for starting or resuming the inferior.  */
 714
 715 #define target_terminal_inferior() \
 716      (*current_target.to_terminal_inferior) ()
 717
 718 /* Put some of our terminal settings into effect,
 719    enough to get proper results from our output,
 720    but do not change into or out of RAW mode
 721    so that no input is discarded.
 722
 723    After doing this, either terminal_ours or terminal_inferior
 724    should be called to get back to a normal state of affairs.  */
 725
 726 #define target_terminal_ours_for_output() \
 727      (*current_target.to_terminal_ours_for_output) ()
 728
 729 /* Put our terminal settings into effect.
 730    First record the inferior's terminal settings
 731    so they can be restored properly later.  */
 732
 733 #define target_terminal_ours() \
 734      (*current_target.to_terminal_ours) ()
 735
 736 /* Save our terminal settings.
 737    This is called from TUI after entering or leaving the curses
 738    mode.  Since curses modifies our terminal this call is here
 739    to take this change into account.  */
 740
 741 #define target_terminal_save_ours() \
 742      (*current_target.to_terminal_save_ours) ()
 743
 744 /* Print useful information about our terminal status, if such a thing
 745    exists.  */
 746
 747 #define target_terminal_info(arg, from_tty) \
 748      (*current_target.to_terminal_info) (arg, from_tty)
 749
 750 /* Kill the inferior process.   Make it go away.  */
 751
 752 #define target_kill() \
 753      (*current_target.to_kill) ()
 754
 755 /* Load an executable file into the target process.  This is expected
 756    to not only bring new code into the target process, but also to
 757    update GDB's symbol tables to match.
 758
 759    ARG contains command-line arguments, to be broken down with
 760    buildargv ().  The first non-switch argument is the filename to
 761    load, FILE; the second is a number (as parsed by strtoul (..., ...,
 762    0)), which is an offset to apply to the load addresses of FILE's
 763    sections.  The target may define switches, or other non-switch
 764    arguments, as it pleases.  */
 765
 766 extern void target_load (char *arg, int from_tty);
 767
 768 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 769    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 770    symbol should be returned.  The result is 0 if successful, nonzero
 771    if the symbol does not exist in the target environment.  This
 772    function should not call error() if communication with the target
 773    is interrupted, since it is called from symbol reading, but should
 774    return nonzero, possibly doing a complain().  */
 775
 776 #define target_lookup_symbol(name, addrp) \
 777      (*current_target.to_lookup_symbol) (name, addrp)
 778
 779 /* Start an inferior process and set inferior_ptid to its pid.
 780    EXEC_FILE is the file to run.
 781    ALLARGS is a string containing the arguments to the program.
 782    ENV is the environment vector to pass.  Errors reported with error().
 783    On VxWorks and various standalone systems, we ignore exec_file.  */
 784
 785 #define target_create_inferior(exec_file, args, env, FROM_TTY)  \
 786      (*current_target.to_create_inferior) (exec_file, args, env, (FROM_TTY))
 787
 788
 789 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 790    notification of inferior events such as fork and vork immediately
 791    after the inferior is created.  (This because of how gdb gets an
 792    inferior created via invoking a shell to do it.  In such a scenario,
 793    if the shell init file has commands in it, the shell will fork and
 794    exec for each of those commands, and we will see each such fork
 795    event.  Very bad.)
 796
 797    Such targets will supply an appropriate definition for this function.  */
 798
 799 #define target_post_startup_inferior(ptid) \
 800      (*current_target.to_post_startup_inferior) (ptid)
 801
 802 /* On some targets, the sequence of starting up an inferior requires
 803    some synchronization between gdb and the new inferior process, PID.  */
 804
 805 #define target_acknowledge_created_inferior(pid) \
 806      (*current_target.to_acknowledge_created_inferior) (pid)
 807
 808 /* On some targets, we can catch an inferior fork or vfork event when
 809    it occurs.  These functions insert/remove an already-created
 810    catchpoint for such events.  */
 811
 812 #define target_insert_fork_catchpoint(pid) \
 813      (*current_target.to_insert_fork_catchpoint) (pid)
 814
 815 #define target_remove_fork_catchpoint(pid) \
 816      (*current_target.to_remove_fork_catchpoint) (pid)
 817
 818 #define target_insert_vfork_catchpoint(pid) \
 819      (*current_target.to_insert_vfork_catchpoint) (pid)
 820
 821 #define target_remove_vfork_catchpoint(pid) \
 822      (*current_target.to_remove_vfork_catchpoint) (pid)
 823
 824 /* If the inferior forks or vforks, this function will be called at
 825    the next resume in order to perform any bookkeeping and fiddling
 826    necessary to continue debugging either the parent or child, as
 827    requested, and releasing the other.  Information about the fork
 828    or vfork event is available via get_last_target_status ().
 829    This function returns 1 if the inferior should not be resumed
 830    (i.e. there is another event pending).  */
 831
 832 int target_follow_fork (int follow_child);
 833
 834 /* On some targets, we can catch an inferior exec event when it
 835    occurs.  These functions insert/remove an already-created
 836    catchpoint for such events.  */
 837
 838 #define target_insert_exec_catchpoint(pid) \
 839      (*current_target.to_insert_exec_catchpoint) (pid)
 840
 841 #define target_remove_exec_catchpoint(pid) \
 842      (*current_target.to_remove_exec_catchpoint) (pid)
 843
 844 /* Returns the number of exec events that are reported when a process
 845    invokes a flavor of the exec() system call on this target, if exec
 846    events are being reported.  */
 847
 848 #define target_reported_exec_events_per_exec_call() \
 849      (*current_target.to_reported_exec_events_per_exec_call) ()
 850
 851 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 852    exit code of PID, if any.  */
 853
 854 #define target_has_exited(pid,wait_status,exit_status) \
 855      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 856
 857 /* The debugger has completed a blocking wait() call.  There is now
 858    some process event that must be processed.  This function should
 859    be defined by those targets that require the debugger to perform
 860    cleanup or internal state changes in response to the process event.  */
 861
 862 /* The inferior process has died.  Do what is right.  */
 863
 864 #define target_mourn_inferior() \
 865      (*current_target.to_mourn_inferior) ()
 866
 867 /* Does target have enough data to do a run or attach command? */
 868
 869 #define target_can_run(t) \
 870      ((t)->to_can_run) ()
 871
 872 /* post process changes to signal handling in the inferior.  */
 873
 874 #define target_notice_signals(ptid) \
 875      (*current_target.to_notice_signals) (ptid)
 876
 877 /* Check to see if a thread is still alive.  */
 878
 879 #define target_thread_alive(ptid) \
 880      (*current_target.to_thread_alive) (ptid)
 881
 882 /* Query for new threads and add them to the thread list.  */
 883
 884 #define target_find_new_threads() \
 885      (*current_target.to_find_new_threads) ()
 886
 887 /* Make target stop in a continuable fashion.  (For instance, under
 888    Unix, this should act like SIGSTOP).  This function is normally
 889    used by GUIs to implement a stop button.  */
 890
 891 #define target_stop current_target.to_stop
 892
 893 /* Send the specified COMMAND to the target's monitor
 894    (shell,interpreter) for execution.  The result of the query is
 895    placed in OUTBUF.  */
 896
 897 #define target_rcmd(command, outbuf) \
 898      (*current_target.to_rcmd) (command, outbuf)
 899
 900
 901 /* Does the target include all of memory, or only part of it?  This
 902    determines whether we look up the target chain for other parts of
 903    memory if this target can't satisfy a request.  */
 904
 905 #define target_has_all_memory   \
 906      (current_target.to_has_all_memory)
 907
 908 /* Does the target include memory?  (Dummy targets don't.)  */
 909
 910 #define target_has_memory       \
 911      (current_target.to_has_memory)
 912
 913 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 914    we start a process.)  */
 915
 916 #define target_has_stack        \
 917      (current_target.to_has_stack)
 918
 919 /* Does the target have registers?  (Exec files don't.)  */
 920
 921 #define target_has_registers    \
 922      (current_target.to_has_registers)
 923
 924 /* Does the target have execution?  Can we make it jump (through
 925    hoops), or pop its stack a few times?  This means that the current
 926    target is currently executing; for some targets, that's the same as
 927    whether or not the target is capable of execution, but there are
 928    also targets which can be current while not executing.  In that
 929    case this will become true after target_create_inferior or
 930    target_attach.  */
 931
 932 #define target_has_execution    \
 933      (current_target.to_has_execution)
 934
 935 /* Can the target support the debugger control of thread execution?
 936    a) Can it lock the thread scheduler?
 937    b) Can it switch the currently running thread?  */
 938
 939 #define target_can_lock_scheduler \
 940      (current_target.to_has_thread_control & tc_schedlock)
 941
 942 #define target_can_switch_threads \
 943      (current_target.to_has_thread_control & tc_switch)
 944
 945 /* Can the target support asynchronous execution? */
 946 #define target_can_async_p() (current_target.to_can_async_p ())
 947
 948 /* Is the target in asynchronous execution mode? */
 949 #define target_is_async_p() (current_target.to_is_async_p())
 950
 951 /* Put the target in async mode with the specified callback function. */
 952 #define target_async(CALLBACK,CONTEXT) \
 953      (current_target.to_async((CALLBACK), (CONTEXT)))
 954
 955 /* This is to be used ONLY within call_function_by_hand(). It provides
 956    a workaround, to have inferior function calls done in sychronous
 957    mode, even though the target is asynchronous. After
 958    target_async_mask(0) is called, calls to target_can_async_p() will
 959    return FALSE , so that target_resume() will not try to start the
 960    target asynchronously. After the inferior stops, we IMMEDIATELY
 961    restore the previous nature of the target, by calling
 962    target_async_mask(1). After that, target_can_async_p() will return
 963    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 964
 965    FIXME ezannoni 1999-12-13: we won't need this once we move
 966    the turning async on and off to the single execution commands,
 967    from where it is done currently, in remote_resume().  */
 968
 969 #define target_async_mask_value \
 970      (current_target.to_async_mask_value)
 971
 972 extern int target_async_mask (int mask);
 973
 974 /* Converts a process id to a string.  Usually, the string just contains
 975    `process xyz', but on some systems it may contain
 976    `process xyz thread abc'.  */
 977
 978 #undef target_pid_to_str
 979 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
 980
 981 #ifndef target_tid_to_str
 982 #define target_tid_to_str(PID) \
 983      target_pid_to_str (PID)
 984 extern char *normal_pid_to_str (ptid_t ptid);
 985 #endif
 986
 987 /* Return a short string describing extra information about PID,
 988    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
 989    is okay.  */
 990
 991 #define target_extra_thread_info(TP) \
 992      (current_target.to_extra_thread_info (TP))
 993
 994 /* Attempts to find the pathname of the executable file
 995    that was run to create a specified process.
 996
 997    The process PID must be stopped when this operation is used.
 998
 999    If the executable file cannot be determined, NULL is returned.
1000
1001    Else, a pointer to a character string containing the pathname
1002    is returned.  This string should be copied into a buffer by
1003    the client if the string will not be immediately used, or if
1004    it must persist.  */
1005
1006 #define target_pid_to_exec_file(pid) \
1007      (current_target.to_pid_to_exec_file) (pid)
1008
1009 /*
1010  * Iterator function for target memory regions.
1011  * Calls a callback function once for each memory region 'mapped'
1012  * in the child process.  Defined as a simple macro rather than
1013  * as a function macro so that it can be tested for nullity.
1014  */
1015
1016 #define target_find_memory_regions(FUNC, DATA) \
1017      (current_target.to_find_memory_regions) (FUNC, DATA)
1018
1019 /*
1020  * Compose corefile .note section.
1021  */
1022
1023 #define target_make_corefile_notes(BFD, SIZE_P) \
1024      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1025
1026 /* Thread-local values.  */
1027 #define target_get_thread_local_address \
1028     (current_target.to_get_thread_local_address)
1029 #define target_get_thread_local_address_p() \
1030     (target_get_thread_local_address != NULL)
1031
1032
1033 /* Hardware watchpoint interfaces.  */
1034
1035 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1036    write).  */
1037
1038 #ifndef STOPPED_BY_WATCHPOINT
1039 #define STOPPED_BY_WATCHPOINT(w) \
1040    (*current_target.to_stopped_by_watchpoint) ()
1041 #endif
1042
1043 /* Non-zero if we have steppable watchpoints  */
1044
1045 #ifndef HAVE_STEPPABLE_WATCHPOINT
1046 #define HAVE_STEPPABLE_WATCHPOINT \
1047    (current_target.to_have_steppable_watchpoint)
1048 #endif
1049
1050 /* Non-zero if we have continuable watchpoints  */
1051
1052 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1053 #define HAVE_CONTINUABLE_WATCHPOINT \
1054    (current_target.to_have_continuable_watchpoint)
1055 #endif
1056
1057 /* Provide defaults for hardware watchpoint functions.  */
1058
1059 /* If the *_hw_beakpoint functions have not been defined
1060    elsewhere use the definitions in the target vector.  */
1061
1062 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1063    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1064    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1065    (including this one?).  OTHERTYPE is who knows what...  */
1066
1067 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1068 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1069  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1070 #endif
1071
1072 #ifndef TARGET_REGION_OK_FOR_HW_WATCHPOINT
1073 #define TARGET_REGION_OK_FOR_HW_WATCHPOINT(addr, len) \
1074     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1075 #endif
1076
1077
1078 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1079    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1080    success, non-zero for failure.  */
1081
1082 #ifndef target_insert_watchpoint
1083 #define target_insert_watchpoint(addr, len, type)       \
1084      (*current_target.to_insert_watchpoint) (addr, len, type)
1085
1086 #define target_remove_watchpoint(addr, len, type)       \
1087      (*current_target.to_remove_watchpoint) (addr, len, type)
1088 #endif
1089
1090 #ifndef target_insert_hw_breakpoint
1091 #define target_insert_hw_breakpoint(bp_tgt) \
1092      (*current_target.to_insert_hw_breakpoint) (bp_tgt)
1093
1094 #define target_remove_hw_breakpoint(bp_tgt) \
1095      (*current_target.to_remove_hw_breakpoint) (bp_tgt)
1096 #endif
1097
1098 extern int target_stopped_data_address_p (struct target_ops *);
1099
1100 #ifndef target_stopped_data_address
1101 #define target_stopped_data_address(target, x) \
1102     (*target.to_stopped_data_address) (target, x)
1103 #else
1104 /* Horrible hack to get around existing macros :-(.  */
1105 #define target_stopped_data_address_p(CURRENT_TARGET) (1)
1106 #endif
1107
1108 extern const struct target_desc *target_read_description (struct target_ops *);
1109
1110 /* Command logging facility.  */
1111
1112 #define target_log_command(p)                                           \
1113   do                                                                    \
1114     if (current_target.to_log_command)                                  \
1115       (*current_target.to_log_command) (p);                             \
1116   while (0)
1117
1118 /* Routines for maintenance of the target structures...
1119
1120    add_target:   Add a target to the list of all possible targets.
1121
1122    push_target:  Make this target the top of the stack of currently used
1123    targets, within its particular stratum of the stack.  Result
1124    is 0 if now atop the stack, nonzero if not on top (maybe
1125    should warn user).
1126
1127    unpush_target: Remove this from the stack of currently used targets,
1128    no matter where it is on the list.  Returns 0 if no
1129    change, 1 if removed from stack.
1130
1131    pop_target:   Remove the top thing on the stack of current targets.  */
1132
1133 extern void add_target (struct target_ops *);
1134
1135 extern int push_target (struct target_ops *);
1136
1137 extern int unpush_target (struct target_ops *);
1138
1139 extern void target_pre_inferior (int);
1140
1141 extern void target_preopen (int);
1142
1143 extern void pop_target (void);
1144
1145 extern CORE_ADDR target_translate_tls_address (struct objfile *objfile,
1146                                                CORE_ADDR offset);
1147
1148 /* Mark a pushed target as running or exited, for targets which do not
1149    automatically pop when not active.  */
1150
1151 void target_mark_running (struct target_ops *);
1152
1153 void target_mark_exited (struct target_ops *);
1154
1155 /* Struct section_table maps address ranges to file sections.  It is
1156    mostly used with BFD files, but can be used without (e.g. for handling
1157    raw disks, or files not in formats handled by BFD).  */
1158
1159 struct section_table
1160   {
1161     CORE_ADDR addr;             /* Lowest address in section */
1162     CORE_ADDR endaddr;          /* 1+highest address in section */
1163
1164     struct bfd_section *the_bfd_section;
1165
1166     bfd *bfd;                   /* BFD file pointer */
1167   };
1168
1169 /* Return the "section" containing the specified address.  */
1170 struct section_table *target_section_by_addr (struct target_ops *target,
1171                                               CORE_ADDR addr);
1172
1173
1174 /* From mem-break.c */
1175
1176 extern int memory_remove_breakpoint (struct bp_target_info *);
1177
1178 extern int memory_insert_breakpoint (struct bp_target_info *);
1179
1180 extern int default_memory_remove_breakpoint (struct gdbarch *, struct bp_target_info *);
1181
1182 extern int default_memory_insert_breakpoint (struct gdbarch *, struct bp_target_info *);
1183
1184
1185 /* From target.c */
1186
1187 extern void initialize_targets (void);
1188
1189 extern void noprocess (void);
1190
1191 extern void target_require_runnable (void);
1192
1193 extern void find_default_attach (char *, int);
1194
1195 extern void find_default_create_inferior (char *, char *, char **, int);
1196
1197 extern struct target_ops *find_run_target (void);
1198
1199 extern struct target_ops *find_core_target (void);
1200
1201 extern struct target_ops *find_target_beneath (struct target_ops *);
1202
1203 extern int target_resize_to_sections (struct target_ops *target,
1204                                       int num_added);
1205
1206 extern void remove_target_sections (bfd *abfd);
1207
1208 \f
1209 /* Stuff that should be shared among the various remote targets.  */
1210
1211 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1212    information (higher values, more information).  */
1213 extern int remote_debug;
1214
1215 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1216 extern int baud_rate;
1217 /* Timeout limit for response from target. */
1218 extern int remote_timeout;
1219
1220 \f
1221 /* Functions for helping to write a native target.  */
1222
1223 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1224 extern void store_waitstatus (struct target_waitstatus *, int);
1225
1226 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1227    targ_signal SIGNO has an equivalent ``host'' representation.  */
1228 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1229    to the shorter target_signal_p() because it is far less ambigious.
1230    In this context ``target_signal'' refers to GDB's internal
1231    representation of the target's set of signals while ``host signal''
1232    refers to the target operating system's signal.  Confused?  */
1233
1234 extern int target_signal_to_host_p (enum target_signal signo);
1235
1236 /* Convert between host signal numbers and enum target_signal's.
1237    target_signal_to_host() returns 0 and prints a warning() on GDB's
1238    console if SIGNO has no equivalent host representation.  */
1239 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1240    refering to the target operating system's signal numbering.
1241    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1242    gdb_signal'' would probably be better as it is refering to GDB's
1243    internal representation of a target operating system's signal.  */
1244
1245 extern enum target_signal target_signal_from_host (int);
1246 extern int target_signal_to_host (enum target_signal);
1247
1248 /* Convert from a number used in a GDB command to an enum target_signal.  */
1249 extern enum target_signal target_signal_from_command (int);
1250
1251 /* Any target can call this to switch to remote protocol (in remote.c). */
1252 extern void push_remote_target (char *name, int from_tty);
1253
1254 /* Set the show memory breakpoints mode to show, and installs a cleanup
1255    to restore it back to the current value.  */
1256 extern struct cleanup *make_show_memory_breakpoints_cleanup (int show);
1257
1258 \f
1259 /* Imported from machine dependent code */
1260
1261 /* Blank target vector entries are initialized to target_ignore. */
1262 void target_ignore (void);
1263
1264 extern struct target_ops deprecated_child_ops;
1265
1266 #endif /* !defined (TARGET_H) */