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
   5    Free Software Foundation, Inc.
   6
   7    Contributed by Cygnus Support.  Written by John Gilmore.
   8
   9    This file is part of GDB.
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24    Boston, MA 02110-1301, USA.  */
  25
  26 #if !defined (TARGET_H)
  27 #define TARGET_H
  28
  29 struct objfile;
  30 struct ui_file;
  31 struct mem_attrib;
  32 struct target_ops;
  33 struct bp_target_info;
  34 struct regcache;
  35
  36 /* This include file defines the interface between the main part
  37    of the debugger, and the part which is target-specific, or
  38    specific to the communications interface between us and the
  39    target.
  40
  41    A TARGET is an interface between the debugger and a particular
  42    kind of file or process.  Targets can be STACKED in STRATA,
  43    so that more than one target can potentially respond to a request.
  44    In particular, memory accesses will walk down the stack of targets
  45    until they find a target that is interested in handling that particular
  46    address.  STRATA are artificial boundaries on the stack, within
  47    which particular kinds of targets live.  Strata exist so that
  48    people don't get confused by pushing e.g. a process target and then
  49    a file target, and wondering why they can't see the current values
  50    of variables any more (the file target is handling them and they
  51    never get to the process target).  So when you push a file target,
  52    it goes into the file stratum, which is always below the process
  53    stratum.  */
  54
  55 #include "bfd.h"
  56 #include "symtab.h"
  57 #include "dcache.h"
  58 #include "memattr.h"
  59 #include "vec.h"
  60
  61 enum strata
  62   {
  63     dummy_stratum,              /* The lowest of the low */
  64     file_stratum,               /* Executable files, etc */
  65     core_stratum,               /* Core dump files */
  66     download_stratum,           /* Downloading of remote targets */
  67     process_stratum,            /* Executing processes */
  68     thread_stratum              /* Executing threads */
  69   };
  70
  71 enum thread_control_capabilities
  72   {
  73     tc_none = 0,                /* Default: can't control thread execution.  */
  74     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  75     tc_switch = 2               /* Can switch the running thread on demand.  */
  76   };
  77
  78 /* Stuff for target_wait.  */
  79
  80 /* Generally, what has the program done?  */
  81 enum target_waitkind
  82   {
  83     /* The program has exited.  The exit status is in value.integer.  */
  84     TARGET_WAITKIND_EXITED,
  85
  86     /* The program has stopped with a signal.  Which signal is in
  87        value.sig.  */
  88     TARGET_WAITKIND_STOPPED,
  89
  90     /* The program has terminated with a signal.  Which signal is in
  91        value.sig.  */
  92     TARGET_WAITKIND_SIGNALLED,
  93
  94     /* The program is letting us know that it dynamically loaded something
  95        (e.g. it called load(2) on AIX).  */
  96     TARGET_WAITKIND_LOADED,
  97
  98     /* The program has forked.  A "related" process' ID is in
  99        value.related_pid.  I.e., if the child forks, value.related_pid
 100        is the parent's ID.  */
 101
 102     TARGET_WAITKIND_FORKED,
 103
 104     /* The program has vforked.  A "related" process's ID is in
 105        value.related_pid.  */
 106
 107     TARGET_WAITKIND_VFORKED,
 108
 109     /* The program has exec'ed a new executable file.  The new file's
 110        pathname is pointed to by value.execd_pathname.  */
 111
 112     TARGET_WAITKIND_EXECD,
 113
 114     /* The program has entered or returned from a system call.  On
 115        HP-UX, this is used in the hardware watchpoint implementation.
 116        The syscall's unique integer ID number is in value.syscall_id */
 117
 118     TARGET_WAITKIND_SYSCALL_ENTRY,
 119     TARGET_WAITKIND_SYSCALL_RETURN,
 120
 121     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 122        within target_wait, but I'm not sure target_wait should be resuming the
 123        inferior.  */
 124     TARGET_WAITKIND_SPURIOUS,
 125
 126     /* An event has occured, but we should wait again.
 127        Remote_async_wait() returns this when there is an event
 128        on the inferior, but the rest of the world is not interested in
 129        it. The inferior has not stopped, but has just sent some output
 130        to the console, for instance. In this case, we want to go back
 131        to the event loop and wait there for another event from the
 132        inferior, rather than being stuck in the remote_async_wait()
 133        function. This way the event loop is responsive to other events,
 134        like for instance the user typing.  */
 135     TARGET_WAITKIND_IGNORE
 136   };
 137
 138 struct target_waitstatus
 139   {
 140     enum target_waitkind kind;
 141
 142     /* Forked child pid, execd pathname, exit status or signal number.  */
 143     union
 144       {
 145         int integer;
 146         enum target_signal sig;
 147         int related_pid;
 148         char *execd_pathname;
 149         int syscall_id;
 150       }
 151     value;
 152   };
 153
 154 /* Possible types of events that the inferior handler will have to
 155    deal with.  */
 156 enum inferior_event_type
 157   {
 158     /* There is a request to quit the inferior, abandon it.  */
 159     INF_QUIT_REQ,
 160     /* Process a normal inferior event which will result in target_wait
 161        being called.  */
 162     INF_REG_EVENT,
 163     /* Deal with an error on the inferior.  */
 164     INF_ERROR,
 165     /* We are called because a timer went off.  */
 166     INF_TIMER,
 167     /* We are called to do stuff after the inferior stops.  */
 168     INF_EXEC_COMPLETE,
 169     /* We are called to do some stuff after the inferior stops, but we
 170        are expected to reenter the proceed() and
 171        handle_inferior_event() functions. This is used only in case of
 172        'step n' like commands.  */
 173     INF_EXEC_CONTINUE
 174   };
 175
 176 /* Return the string for a signal.  */
 177 extern char *target_signal_to_string (enum target_signal);
 178
 179 /* Return the name (SIGHUP, etc.) for a signal.  */
 180 extern char *target_signal_to_name (enum target_signal);
 181
 182 /* Given a name (SIGHUP, etc.), return its signal.  */
 183 enum target_signal target_signal_from_name (char *);
 184 \f
 185 /* Target objects which can be transfered using target_read,
 186    target_write, et cetera.  */
 187
 188 enum target_object
 189 {
 190   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 191   TARGET_OBJECT_AVR,
 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   /* Possible future objects: TARGET_OBJECT_FILE, TARGET_OBJECT_PROC, ... */
 215 };
 216
 217 /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 218    OBJECT.  The OFFSET, for a seekable object, specifies the
 219    starting point.  The ANNEX can be used to provide additional
 220    data-specific information to the target.
 221
 222    Return the number of bytes actually transfered, or -1 if the
 223    transfer is not supported or otherwise fails.  Return of a positive
 224    value less than LEN indicates that no further transfer is possible.
 225    Unlike the raw to_xfer_partial interface, callers of these
 226    functions do not need to retry partial transfers.  */
 227
 228 extern LONGEST target_read (struct target_ops *ops,
 229                             enum target_object object,
 230                             const char *annex, gdb_byte *buf,
 231                             ULONGEST offset, LONGEST len);
 232
 233 extern LONGEST target_write (struct target_ops *ops,
 234                              enum target_object object,
 235                              const char *annex, const gdb_byte *buf,
 236                              ULONGEST offset, LONGEST len);
 237
 238 /* Similar to target_write, except that it also calls PROGRESS with
 239    the number of bytes written and the opaque BATON after every
 240    successful partial write (and before the first write).  This is
 241    useful for progress reporting and user interaction while writing
 242    data.  To abort the transfer, the progress callback can throw an
 243    exception.  */
 244
 245 LONGEST target_write_with_progress (struct target_ops *ops,
 246                                     enum target_object object,
 247                                     const char *annex, const gdb_byte *buf,
 248                                     ULONGEST offset, LONGEST len,
 249                                     void (*progress) (ULONGEST, void *),
 250                                     void *baton);
 251
 252 /* Wrapper to perform a full read of unknown size.  OBJECT/ANNEX will
 253    be read using OPS.  The return value will be -1 if the transfer
 254    fails or is not supported; 0 if the object is empty; or the length
 255    of the object otherwise.  If a positive value is returned, a
 256    sufficiently large buffer will be allocated using xmalloc and
 257    returned in *BUF_P containing the contents of the object.
 258
 259    This method should be used for objects sufficiently small to store
 260    in a single xmalloc'd buffer, when no fixed bound on the object's
 261    size is known in advance.  Don't try to read TARGET_OBJECT_MEMORY
 262    through this function.  */
 263
 264 extern LONGEST target_read_alloc (struct target_ops *ops,
 265                                   enum target_object object,
 266                                   const char *annex, gdb_byte **buf_p);
 267
 268 /* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and
 269    returned as a string, allocated using xmalloc.  If an error occurs
 270    or the transfer is unsupported, NULL is returned.  Empty objects
 271    are returned as allocated but empty strings.  A warning is issued
 272    if the result contains any embedded NUL bytes.  */
 273
 274 extern char *target_read_stralloc (struct target_ops *ops,
 275                                    enum target_object object,
 276                                    const char *annex);
 277
 278 /* Wrappers to target read/write that perform memory transfers.  They
 279    throw an error if the memory transfer fails.
 280
 281    NOTE: cagney/2003-10-23: The naming schema is lifted from
 282    "frame.h".  The parameter order is lifted from get_frame_memory,
 283    which in turn lifted it from read_memory.  */
 284
 285 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 286                                gdb_byte *buf, LONGEST len);
 287 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 288                                             CORE_ADDR addr, int len);
 289 \f
 290
 291 /* If certain kinds of activity happen, target_wait should perform
 292    callbacks.  */
 293 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 294    on TARGET_ACTIVITY_FD.  */
 295 extern int target_activity_fd;
 296 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 297 extern int (*target_activity_function) (void);
 298 \f
 299 struct thread_info;             /* fwd decl for parameter list below: */
 300
 301 struct target_ops
 302   {
 303     struct target_ops *beneath; /* To the target under this one.  */
 304     char *to_shortname;         /* Name this target type */
 305     char *to_longname;          /* Name for printing */
 306     char *to_doc;               /* Documentation.  Does not include trailing
 307                                    newline, and starts with a one-line descrip-
 308                                    tion (probably similar to to_longname).  */
 309     /* Per-target scratch pad.  */
 310     void *to_data;
 311     /* The open routine takes the rest of the parameters from the
 312        command, and (if successful) pushes a new target onto the
 313        stack.  Targets should supply this routine, if only to provide
 314        an error message.  */
 315     void (*to_open) (char *, int);
 316     /* Old targets with a static target vector provide "to_close".
 317        New re-entrant targets provide "to_xclose" and that is expected
 318        to xfree everything (including the "struct target_ops").  */
 319     void (*to_xclose) (struct target_ops *targ, int quitting);
 320     void (*to_close) (int);
 321     void (*to_attach) (char *, int);
 322     void (*to_post_attach) (int);
 323     void (*to_detach) (char *, int);
 324     void (*to_disconnect) (struct target_ops *, char *, int);
 325     void (*to_resume) (ptid_t, int, enum target_signal);
 326     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 327     void (*to_fetch_registers) (struct regcache *, int);
 328     void (*to_store_registers) (struct regcache *, int);
 329     void (*to_prepare_to_store) (struct regcache *);
 330
 331     /* Transfer LEN bytes of memory between GDB address MYADDR and
 332        target address MEMADDR.  If WRITE, transfer them to the target, else
 333        transfer them from the target.  TARGET is the target from which we
 334        get this function.
 335
 336        Return value, N, is one of the following:
 337
 338        0 means that we can't handle this.  If errno has been set, it is the
 339        error which prevented us from doing it (FIXME: What about bfd_error?).
 340
 341        positive (call it N) means that we have transferred N bytes
 342        starting at MEMADDR.  We might be able to handle more bytes
 343        beyond this length, but no promises.
 344
 345        negative (call its absolute value N) means that we cannot
 346        transfer right at MEMADDR, but we could transfer at least
 347        something at MEMADDR + N.
 348
 349        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 350        to_xfer_partial and inferior inheritance.  */
 351
 352     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 353                                    int len, int write,
 354                                    struct mem_attrib *attrib,
 355                                    struct target_ops *target);
 356
 357     void (*to_files_info) (struct target_ops *);
 358     int (*to_insert_breakpoint) (struct bp_target_info *);
 359     int (*to_remove_breakpoint) (struct bp_target_info *);
 360     int (*to_can_use_hw_breakpoint) (int, int, int);
 361     int (*to_insert_hw_breakpoint) (struct bp_target_info *);
 362     int (*to_remove_hw_breakpoint) (struct bp_target_info *);
 363     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 364     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 365     int (*to_stopped_by_watchpoint) (void);
 366     int to_have_steppable_watchpoint;
 367     int to_have_continuable_watchpoint;
 368     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 369     int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);
 370     void (*to_terminal_init) (void);
 371     void (*to_terminal_inferior) (void);
 372     void (*to_terminal_ours_for_output) (void);
 373     void (*to_terminal_ours) (void);
 374     void (*to_terminal_save_ours) (void);
 375     void (*to_terminal_info) (char *, int);
 376     void (*to_kill) (void);
 377     void (*to_load) (char *, int);
 378     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 379     void (*to_create_inferior) (char *, char *, char **, int);
 380     void (*to_post_startup_inferior) (ptid_t);
 381     void (*to_acknowledge_created_inferior) (int);
 382     void (*to_insert_fork_catchpoint) (int);
 383     int (*to_remove_fork_catchpoint) (int);
 384     void (*to_insert_vfork_catchpoint) (int);
 385     int (*to_remove_vfork_catchpoint) (int);
 386     int (*to_follow_fork) (struct target_ops *, int);
 387     void (*to_insert_exec_catchpoint) (int);
 388     int (*to_remove_exec_catchpoint) (int);
 389     int (*to_reported_exec_events_per_exec_call) (void);
 390     int (*to_has_exited) (int, int, int *);
 391     void (*to_mourn_inferior) (void);
 392     int (*to_can_run) (void);
 393     void (*to_notice_signals) (ptid_t ptid);
 394     int (*to_thread_alive) (ptid_t ptid);
 395     void (*to_find_new_threads) (void);
 396     char *(*to_pid_to_str) (ptid_t);
 397     char *(*to_extra_thread_info) (struct thread_info *);
 398     void (*to_stop) (void);
 399     void (*to_rcmd) (char *command, struct ui_file *output);
 400     struct symtab_and_line *(*to_enable_exception_callback) (enum
 401                                                              exception_event_kind,
 402                                                              int);
 403     struct exception_event_record *(*to_get_current_exception_event) (void);
 404     char *(*to_pid_to_exec_file) (int pid);
 405     enum strata to_stratum;
 406     int to_has_all_memory;
 407     int to_has_memory;
 408     int to_has_stack;
 409     int to_has_registers;
 410     int to_has_execution;
 411     int to_has_thread_control;  /* control thread execution */
 412     struct section_table
 413      *to_sections;
 414     struct section_table
 415      *to_sections_end;
 416     /* ASYNC target controls */
 417     int (*to_can_async_p) (void);
 418     int (*to_is_async_p) (void);
 419     void (*to_async) (void (*cb) (enum inferior_event_type, void *context),
 420                       void *context);
 421     int to_async_mask_value;
 422     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 423                                             unsigned long,
 424                                             int, int, int,
 425                                             void *),
 426                                    void *);
 427     char * (*to_make_corefile_notes) (bfd *, int *);
 428
 429     /* Return the thread-local address at OFFSET in the
 430        thread-local storage for the thread PTID and the shared library
 431        or executable file given by OBJFILE.  If that block of
 432        thread-local storage hasn't been allocated yet, this function
 433        may return an error.  */
 434     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 435                                               CORE_ADDR load_module_addr,
 436                                               CORE_ADDR offset);
 437
 438     /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 439        OBJECT.  The OFFSET, for a seekable object, specifies the
 440        starting point.  The ANNEX can be used to provide additional
 441        data-specific information to the target.
 442
 443        Return the number of bytes actually transfered, zero when no
 444        further transfer is possible, and -1 when the transfer is not
 445        supported.  Return of a positive value smaller than LEN does
 446        not indicate the end of the object, only the end of the
 447        transfer; higher level code should continue transferring if
 448        desired.  This is handled in target.c.
 449
 450        The interface does not support a "retry" mechanism.  Instead it
 451        assumes that at least one byte will be transfered on each
 452        successful call.
 453
 454        NOTE: cagney/2003-10-17: The current interface can lead to
 455        fragmented transfers.  Lower target levels should not implement
 456        hacks, such as enlarging the transfer, in an attempt to
 457        compensate for this.  Instead, the target stack should be
 458        extended so that it implements supply/collect methods and a
 459        look-aside object cache.  With that available, the lowest
 460        target can safely and freely "push" data up the stack.
 461
 462        See target_read and target_write for more information.  One,
 463        and only one, of readbuf or writebuf must be non-NULL.  */
 464
 465     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 466                                 enum target_object object, const char *annex,
 467                                 gdb_byte *readbuf, const gdb_byte *writebuf,
 468                                 ULONGEST offset, LONGEST len);
 469
 470     /* Returns the memory map for the target.  A return value of NULL
 471        means that no memory map is available.  If a memory address
 472        does not fall within any returned regions, it's assumed to be
 473        RAM.  The returned memory regions should not overlap.
 474
 475        The order of regions does not matter; target_memory_map will
 476        sort regions by starting address. For that reason, this
 477        function should not be called directly except via
 478        target_memory_map.
 479
 480        This method should not cache data; if the memory map could
 481        change unexpectedly, it should be invalidated, and higher
 482        layers will re-fetch it.  */
 483     VEC(mem_region_s) *(*to_memory_map) (struct target_ops *);
 484
 485     /* Erases the region of flash memory starting at ADDRESS, of
 486        length LENGTH.
 487
 488        Precondition: both ADDRESS and ADDRESS+LENGTH should be aligned
 489        on flash block boundaries, as reported by 'to_memory_map'.  */
 490     void (*to_flash_erase) (struct target_ops *,
 491                            ULONGEST address, LONGEST length);
 492
 493     /* Finishes a flash memory write sequence.  After this operation
 494        all flash memory should be available for writing and the result
 495        of reading from areas written by 'to_flash_write' should be
 496        equal to what was written.  */
 497     void (*to_flash_done) (struct target_ops *);
 498
 499     /* Describe the architecture-specific features of this target.
 500        Returns the description found, or NULL if no description
 501        was available.  */
 502     const struct target_desc *(*to_read_description) (struct target_ops *ops);
 503
 504     int to_magic;
 505     /* Need sub-structure for target machine related rather than comm related?
 506      */
 507   };
 508
 509 /* Magic number for checking ops size.  If a struct doesn't end with this
 510    number, somebody changed the declaration but didn't change all the
 511    places that initialize one.  */
 512
 513 #define OPS_MAGIC       3840
 514
 515 /* The ops structure for our "current" target process.  This should
 516    never be NULL.  If there is no target, it points to the dummy_target.  */
 517
 518 extern struct target_ops current_target;
 519
 520 /* Define easy words for doing these operations on our current target.  */
 521
 522 #define target_shortname        (current_target.to_shortname)
 523 #define target_longname         (current_target.to_longname)
 524
 525 /* Does whatever cleanup is required for a target that we are no
 526    longer going to be calling.  QUITTING indicates that GDB is exiting
 527    and should not get hung on an error (otherwise it is important to
 528    perform clean termination, even if it takes a while).  This routine
 529    is automatically always called when popping the target off the
 530    target stack (to_beneath is undefined).  Closing file descriptors
 531    and freeing all memory allocated memory are typical things it
 532    should do.  */
 533
 534 void target_close (struct target_ops *targ, int quitting);
 535
 536 /* Attaches to a process on the target side.  Arguments are as passed
 537    to the `attach' command by the user.  This routine can be called
 538    when the target is not on the target-stack, if the target_can_run
 539    routine returns 1; in that case, it must push itself onto the stack.
 540    Upon exit, the target should be ready for normal operations, and
 541    should be ready to deliver the status of the process immediately
 542    (without waiting) to an upcoming target_wait call.  */
 543
 544 #define target_attach(args, from_tty)   \
 545      (*current_target.to_attach) (args, from_tty)
 546
 547 /* The target_attach operation places a process under debugger control,
 548    and stops the process.
 549
 550    This operation provides a target-specific hook that allows the
 551    necessary bookkeeping to be performed after an attach completes.  */
 552 #define target_post_attach(pid) \
 553      (*current_target.to_post_attach) (pid)
 554
 555 /* Takes a program previously attached to and detaches it.
 556    The program may resume execution (some targets do, some don't) and will
 557    no longer stop on signals, etc.  We better not have left any breakpoints
 558    in the program or it'll die when it hits one.  ARGS is arguments
 559    typed by the user (e.g. a signal to send the process).  FROM_TTY
 560    says whether to be verbose or not.  */
 561
 562 extern void target_detach (char *, int);
 563
 564 /* Disconnect from the current target without resuming it (leaving it
 565    waiting for a debugger).  */
 566
 567 extern void target_disconnect (char *, int);
 568
 569 /* Resume execution of the target process PTID.  STEP says whether to
 570    single-step or to run free; SIGGNAL is the signal to be given to
 571    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 572    pass TARGET_SIGNAL_DEFAULT.  */
 573
 574 #define target_resume(ptid, step, siggnal)                              \
 575   do {                                                                  \
 576     dcache_invalidate(target_dcache);                                   \
 577     (*current_target.to_resume) (ptid, step, siggnal);                  \
 578   } while (0)
 579
 580 /* Wait for process pid to do something.  PTID = -1 to wait for any
 581    pid to do something.  Return pid of child, or -1 in case of error;
 582    store status through argument pointer STATUS.  Note that it is
 583    _NOT_ OK to throw_exception() out of target_wait() without popping
 584    the debugging target from the stack; GDB isn't prepared to get back
 585    to the prompt with a debugging target but without the frame cache,
 586    stop_pc, etc., set up.  */
 587
 588 #define target_wait(ptid, status)               \
 589      (*current_target.to_wait) (ptid, status)
 590
 591 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 592
 593 #define target_fetch_registers(regcache, regno) \
 594      (*current_target.to_fetch_registers) (regcache, regno)
 595
 596 /* Store at least register REGNO, or all regs if REGNO == -1.
 597    It can store as many registers as it wants to, so target_prepare_to_store
 598    must have been previously called.  Calls error() if there are problems.  */
 599
 600 #define target_store_registers(regcache, regs)  \
 601      (*current_target.to_store_registers) (regcache, regs)
 602
 603 /* Get ready to modify the registers array.  On machines which store
 604    individual registers, this doesn't need to do anything.  On machines
 605    which store all the registers in one fell swoop, this makes sure
 606    that REGISTERS contains all the registers from the program being
 607    debugged.  */
 608
 609 #define target_prepare_to_store(regcache)       \
 610      (*current_target.to_prepare_to_store) (regcache)
 611
 612 extern DCACHE *target_dcache;
 613
 614 extern int target_read_string (CORE_ADDR, char **, int, int *);
 615
 616 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 617
 618 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 619                                 int len);
 620
 621 extern int xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 622                         struct mem_attrib *, struct target_ops *);
 623
 624 extern int child_xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 625                               struct mem_attrib *, struct target_ops *);
 626
 627 /* Fetches the target's memory map.  If one is found it is sorted
 628    and returned, after some consistency checking.  Otherwise, NULL
 629    is returned.  */
 630 VEC(mem_region_s) *target_memory_map (void);
 631
 632 /* Erase the specified flash region.  */
 633 void target_flash_erase (ULONGEST address, LONGEST length);
 634
 635 /* Finish a sequence of flash operations.  */
 636 void target_flash_done (void);
 637
 638 /* Describes a request for a memory write operation.  */
 639 struct memory_write_request
 640   {
 641     /* Begining address that must be written. */
 642     ULONGEST begin;
 643     /* Past-the-end address. */
 644     ULONGEST end;
 645     /* The data to write. */
 646     gdb_byte *data;
 647     /* A callback baton for progress reporting for this request.  */
 648     void *baton;
 649   };
 650 typedef struct memory_write_request memory_write_request_s;
 651 DEF_VEC_O(memory_write_request_s);
 652
 653 /* Enumeration specifying different flash preservation behaviour.  */
 654 enum flash_preserve_mode
 655   {
 656     flash_preserve,
 657     flash_discard
 658   };
 659
 660 /* Write several memory blocks at once.  This version can be more
 661    efficient than making several calls to target_write_memory, in
 662    particular because it can optimize accesses to flash memory.
 663
 664    Moreover, this is currently the only memory access function in gdb
 665    that supports writing to flash memory, and it should be used for
 666    all cases where access to flash memory is desirable.
 667
 668    REQUESTS is the vector (see vec.h) of memory_write_request.
 669    PRESERVE_FLASH_P indicates what to do with blocks which must be
 670      erased, but not completely rewritten.
 671    PROGRESS_CB is a function that will be periodically called to provide
 672      feedback to user.  It will be called with the baton corresponding
 673      to the request currently being written.  It may also be called
 674      with a NULL baton, when preserved flash sectors are being rewritten.
 675
 676    The function returns 0 on success, and error otherwise.  */
 677 int target_write_memory_blocks (VEC(memory_write_request_s) *requests,
 678                                 enum flash_preserve_mode preserve_flash_p,
 679                                 void (*progress_cb) (ULONGEST, void *));
 680
 681
 682 extern char *child_pid_to_exec_file (int);
 683
 684 extern char *child_core_file_to_sym_file (char *);
 685
 686 #if defined(CHILD_POST_ATTACH)
 687 extern void child_post_attach (int);
 688 #endif
 689
 690 extern void child_post_startup_inferior (ptid_t);
 691
 692 extern void child_acknowledge_created_inferior (int);
 693
 694 extern void child_insert_fork_catchpoint (int);
 695
 696 extern int child_remove_fork_catchpoint (int);
 697
 698 extern void child_insert_vfork_catchpoint (int);
 699
 700 extern int child_remove_vfork_catchpoint (int);
 701
 702 extern void child_acknowledge_created_inferior (int);
 703
 704 extern int child_follow_fork (struct target_ops *, int);
 705
 706 extern void child_insert_exec_catchpoint (int);
 707
 708 extern int child_remove_exec_catchpoint (int);
 709
 710 extern int child_reported_exec_events_per_exec_call (void);
 711
 712 extern int child_has_exited (int, int, int *);
 713
 714 extern int child_thread_alive (ptid_t);
 715
 716 /* From infrun.c.  */
 717
 718 extern int inferior_has_forked (int pid, int *child_pid);
 719
 720 extern int inferior_has_vforked (int pid, int *child_pid);
 721
 722 extern int inferior_has_execd (int pid, char **execd_pathname);
 723
 724 /* From exec.c */
 725
 726 extern void print_section_info (struct target_ops *, bfd *);
 727
 728 /* Print a line about the current target.  */
 729
 730 #define target_files_info()     \
 731      (*current_target.to_files_info) (&current_target)
 732
 733 /* Insert a breakpoint at address BP_TGT->placed_address in the target
 734    machine.  Result is 0 for success, or an errno value.  */
 735
 736 #define target_insert_breakpoint(bp_tgt)        \
 737      (*current_target.to_insert_breakpoint) (bp_tgt)
 738
 739 /* Remove a breakpoint at address BP_TGT->placed_address in the target
 740    machine.  Result is 0 for success, or an errno value.  */
 741
 742 #define target_remove_breakpoint(bp_tgt)        \
 743      (*current_target.to_remove_breakpoint) (bp_tgt)
 744
 745 /* Initialize the terminal settings we record for the inferior,
 746    before we actually run the inferior.  */
 747
 748 #define target_terminal_init() \
 749      (*current_target.to_terminal_init) ()
 750
 751 /* Put the inferior's terminal settings into effect.
 752    This is preparation for starting or resuming the inferior.  */
 753
 754 #define target_terminal_inferior() \
 755      (*current_target.to_terminal_inferior) ()
 756
 757 /* Put some of our terminal settings into effect,
 758    enough to get proper results from our output,
 759    but do not change into or out of RAW mode
 760    so that no input is discarded.
 761
 762    After doing this, either terminal_ours or terminal_inferior
 763    should be called to get back to a normal state of affairs.  */
 764
 765 #define target_terminal_ours_for_output() \
 766      (*current_target.to_terminal_ours_for_output) ()
 767
 768 /* Put our terminal settings into effect.
 769    First record the inferior's terminal settings
 770    so they can be restored properly later.  */
 771
 772 #define target_terminal_ours() \
 773      (*current_target.to_terminal_ours) ()
 774
 775 /* Save our terminal settings.
 776    This is called from TUI after entering or leaving the curses
 777    mode.  Since curses modifies our terminal this call is here
 778    to take this change into account.  */
 779
 780 #define target_terminal_save_ours() \
 781      (*current_target.to_terminal_save_ours) ()
 782
 783 /* Print useful information about our terminal status, if such a thing
 784    exists.  */
 785
 786 #define target_terminal_info(arg, from_tty) \
 787      (*current_target.to_terminal_info) (arg, from_tty)
 788
 789 /* Kill the inferior process.   Make it go away.  */
 790
 791 #define target_kill() \
 792      (*current_target.to_kill) ()
 793
 794 /* Load an executable file into the target process.  This is expected
 795    to not only bring new code into the target process, but also to
 796    update GDB's symbol tables to match.
 797
 798    ARG contains command-line arguments, to be broken down with
 799    buildargv ().  The first non-switch argument is the filename to
 800    load, FILE; the second is a number (as parsed by strtoul (..., ...,
 801    0)), which is an offset to apply to the load addresses of FILE's
 802    sections.  The target may define switches, or other non-switch
 803    arguments, as it pleases.  */
 804
 805 extern void target_load (char *arg, int from_tty);
 806
 807 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 808    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 809    symbol should be returned.  The result is 0 if successful, nonzero
 810    if the symbol does not exist in the target environment.  This
 811    function should not call error() if communication with the target
 812    is interrupted, since it is called from symbol reading, but should
 813    return nonzero, possibly doing a complain().  */
 814
 815 #define target_lookup_symbol(name, addrp) \
 816      (*current_target.to_lookup_symbol) (name, addrp)
 817
 818 /* Start an inferior process and set inferior_ptid to its pid.
 819    EXEC_FILE is the file to run.
 820    ALLARGS is a string containing the arguments to the program.
 821    ENV is the environment vector to pass.  Errors reported with error().
 822    On VxWorks and various standalone systems, we ignore exec_file.  */
 823
 824 #define target_create_inferior(exec_file, args, env, FROM_TTY)  \
 825      (*current_target.to_create_inferior) (exec_file, args, env, (FROM_TTY))
 826
 827
 828 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 829    notification of inferior events such as fork and vork immediately
 830    after the inferior is created.  (This because of how gdb gets an
 831    inferior created via invoking a shell to do it.  In such a scenario,
 832    if the shell init file has commands in it, the shell will fork and
 833    exec for each of those commands, and we will see each such fork
 834    event.  Very bad.)
 835
 836    Such targets will supply an appropriate definition for this function.  */
 837
 838 #define target_post_startup_inferior(ptid) \
 839      (*current_target.to_post_startup_inferior) (ptid)
 840
 841 /* On some targets, the sequence of starting up an inferior requires
 842    some synchronization between gdb and the new inferior process, PID.  */
 843
 844 #define target_acknowledge_created_inferior(pid) \
 845      (*current_target.to_acknowledge_created_inferior) (pid)
 846
 847 /* On some targets, we can catch an inferior fork or vfork event when
 848    it occurs.  These functions insert/remove an already-created
 849    catchpoint for such events.  */
 850
 851 #define target_insert_fork_catchpoint(pid) \
 852      (*current_target.to_insert_fork_catchpoint) (pid)
 853
 854 #define target_remove_fork_catchpoint(pid) \
 855      (*current_target.to_remove_fork_catchpoint) (pid)
 856
 857 #define target_insert_vfork_catchpoint(pid) \
 858      (*current_target.to_insert_vfork_catchpoint) (pid)
 859
 860 #define target_remove_vfork_catchpoint(pid) \
 861      (*current_target.to_remove_vfork_catchpoint) (pid)
 862
 863 /* If the inferior forks or vforks, this function will be called at
 864    the next resume in order to perform any bookkeeping and fiddling
 865    necessary to continue debugging either the parent or child, as
 866    requested, and releasing the other.  Information about the fork
 867    or vfork event is available via get_last_target_status ().
 868    This function returns 1 if the inferior should not be resumed
 869    (i.e. there is another event pending).  */
 870
 871 int target_follow_fork (int follow_child);
 872
 873 /* On some targets, we can catch an inferior exec event when it
 874    occurs.  These functions insert/remove an already-created
 875    catchpoint for such events.  */
 876
 877 #define target_insert_exec_catchpoint(pid) \
 878      (*current_target.to_insert_exec_catchpoint) (pid)
 879
 880 #define target_remove_exec_catchpoint(pid) \
 881      (*current_target.to_remove_exec_catchpoint) (pid)
 882
 883 /* Returns the number of exec events that are reported when a process
 884    invokes a flavor of the exec() system call on this target, if exec
 885    events are being reported.  */
 886
 887 #define target_reported_exec_events_per_exec_call() \
 888      (*current_target.to_reported_exec_events_per_exec_call) ()
 889
 890 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 891    exit code of PID, if any.  */
 892
 893 #define target_has_exited(pid,wait_status,exit_status) \
 894      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 895
 896 /* The debugger has completed a blocking wait() call.  There is now
 897    some process event that must be processed.  This function should
 898    be defined by those targets that require the debugger to perform
 899    cleanup or internal state changes in response to the process event.  */
 900
 901 /* The inferior process has died.  Do what is right.  */
 902
 903 #define target_mourn_inferior() \
 904      (*current_target.to_mourn_inferior) ()
 905
 906 /* Does target have enough data to do a run or attach command? */
 907
 908 #define target_can_run(t) \
 909      ((t)->to_can_run) ()
 910
 911 /* post process changes to signal handling in the inferior.  */
 912
 913 #define target_notice_signals(ptid) \
 914      (*current_target.to_notice_signals) (ptid)
 915
 916 /* Check to see if a thread is still alive.  */
 917
 918 #define target_thread_alive(ptid) \
 919      (*current_target.to_thread_alive) (ptid)
 920
 921 /* Query for new threads and add them to the thread list.  */
 922
 923 #define target_find_new_threads() \
 924      (*current_target.to_find_new_threads) (); \
 925
 926 /* Make target stop in a continuable fashion.  (For instance, under
 927    Unix, this should act like SIGSTOP).  This function is normally
 928    used by GUIs to implement a stop button.  */
 929
 930 #define target_stop current_target.to_stop
 931
 932 /* Send the specified COMMAND to the target's monitor
 933    (shell,interpreter) for execution.  The result of the query is
 934    placed in OUTBUF.  */
 935
 936 #define target_rcmd(command, outbuf) \
 937      (*current_target.to_rcmd) (command, outbuf)
 938
 939
 940 /* Get the symbol information for a breakpointable routine called when
 941    an exception event occurs.
 942    Intended mainly for C++, and for those
 943    platforms/implementations where such a callback mechanism is available,
 944    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 945    different mechanisms for debugging exceptions.  */
 946
 947 #define target_enable_exception_callback(kind, enable) \
 948      (*current_target.to_enable_exception_callback) (kind, enable)
 949
 950 /* Get the current exception event kind -- throw or catch, etc.  */
 951
 952 #define target_get_current_exception_event() \
 953      (*current_target.to_get_current_exception_event) ()
 954
 955 /* Does the target include all of memory, or only part of it?  This
 956    determines whether we look up the target chain for other parts of
 957    memory if this target can't satisfy a request.  */
 958
 959 #define target_has_all_memory   \
 960      (current_target.to_has_all_memory)
 961
 962 /* Does the target include memory?  (Dummy targets don't.)  */
 963
 964 #define target_has_memory       \
 965      (current_target.to_has_memory)
 966
 967 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 968    we start a process.)  */
 969
 970 #define target_has_stack        \
 971      (current_target.to_has_stack)
 972
 973 /* Does the target have registers?  (Exec files don't.)  */
 974
 975 #define target_has_registers    \
 976      (current_target.to_has_registers)
 977
 978 /* Does the target have execution?  Can we make it jump (through
 979    hoops), or pop its stack a few times?  This means that the current
 980    target is currently executing; for some targets, that's the same as
 981    whether or not the target is capable of execution, but there are
 982    also targets which can be current while not executing.  In that
 983    case this will become true after target_create_inferior or
 984    target_attach.  */
 985
 986 #define target_has_execution    \
 987      (current_target.to_has_execution)
 988
 989 /* Can the target support the debugger control of thread execution?
 990    a) Can it lock the thread scheduler?
 991    b) Can it switch the currently running thread?  */
 992
 993 #define target_can_lock_scheduler \
 994      (current_target.to_has_thread_control & tc_schedlock)
 995
 996 #define target_can_switch_threads \
 997      (current_target.to_has_thread_control & tc_switch)
 998
 999 /* Can the target support asynchronous execution? */
1000 #define target_can_async_p() (current_target.to_can_async_p ())
1001
1002 /* Is the target in asynchronous execution mode? */
1003 #define target_is_async_p() (current_target.to_is_async_p())
1004
1005 /* Put the target in async mode with the specified callback function. */
1006 #define target_async(CALLBACK,CONTEXT) \
1007      (current_target.to_async((CALLBACK), (CONTEXT)))
1008
1009 /* This is to be used ONLY within call_function_by_hand(). It provides
1010    a workaround, to have inferior function calls done in sychronous
1011    mode, even though the target is asynchronous. After
1012    target_async_mask(0) is called, calls to target_can_async_p() will
1013    return FALSE , so that target_resume() will not try to start the
1014    target asynchronously. After the inferior stops, we IMMEDIATELY
1015    restore the previous nature of the target, by calling
1016    target_async_mask(1). After that, target_can_async_p() will return
1017    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
1018
1019    FIXME ezannoni 1999-12-13: we won't need this once we move
1020    the turning async on and off to the single execution commands,
1021    from where it is done currently, in remote_resume().  */
1022
1023 #define target_async_mask_value \
1024      (current_target.to_async_mask_value)
1025
1026 extern int target_async_mask (int mask);
1027
1028 /* Converts a process id to a string.  Usually, the string just contains
1029    `process xyz', but on some systems it may contain
1030    `process xyz thread abc'.  */
1031
1032 #undef target_pid_to_str
1033 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
1034
1035 #ifndef target_tid_to_str
1036 #define target_tid_to_str(PID) \
1037      target_pid_to_str (PID)
1038 extern char *normal_pid_to_str (ptid_t ptid);
1039 #endif
1040
1041 /* Return a short string describing extra information about PID,
1042    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
1043    is okay.  */
1044
1045 #define target_extra_thread_info(TP) \
1046      (current_target.to_extra_thread_info (TP))
1047
1048 /*
1049  * New Objfile Event Hook:
1050  *
1051  * Sometimes a GDB component wants to get notified whenever a new
1052  * objfile is loaded.  Mainly this is used by thread-debugging
1053  * implementations that need to know when symbols for the target
1054  * thread implemenation are available.
1055  *
1056  * The old way of doing this is to define a macro 'target_new_objfile'
1057  * that points to the function that you want to be called on every
1058  * objfile/shlib load.
1059
1060    The new way is to grab the function pointer,
1061    'deprecated_target_new_objfile_hook', and point it to the function
1062    that you want to be called on every objfile/shlib load.
1063
1064    If multiple clients are willing to be cooperative, they can each
1065    save a pointer to the previous value of
1066    deprecated_target_new_objfile_hook before modifying it, and arrange
1067    for their function to call the previous function in the chain.  In
1068    that way, multiple clients can receive this notification (something
1069    like with signal handlers).  */
1070
1071 extern void (*deprecated_target_new_objfile_hook) (struct objfile *);
1072
1073 #ifndef target_pid_or_tid_to_str
1074 #define target_pid_or_tid_to_str(ID) \
1075      target_pid_to_str (ID)
1076 #endif
1077
1078 /* Attempts to find the pathname of the executable file
1079    that was run to create a specified process.
1080
1081    The process PID must be stopped when this operation is used.
1082
1083    If the executable file cannot be determined, NULL is returned.
1084
1085    Else, a pointer to a character string containing the pathname
1086    is returned.  This string should be copied into a buffer by
1087    the client if the string will not be immediately used, or if
1088    it must persist.  */
1089
1090 #define target_pid_to_exec_file(pid) \
1091      (current_target.to_pid_to_exec_file) (pid)
1092
1093 /*
1094  * Iterator function for target memory regions.
1095  * Calls a callback function once for each memory region 'mapped'
1096  * in the child process.  Defined as a simple macro rather than
1097  * as a function macro so that it can be tested for nullity.
1098  */
1099
1100 #define target_find_memory_regions(FUNC, DATA) \
1101      (current_target.to_find_memory_regions) (FUNC, DATA)
1102
1103 /*
1104  * Compose corefile .note section.
1105  */
1106
1107 #define target_make_corefile_notes(BFD, SIZE_P) \
1108      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1109
1110 /* Thread-local values.  */
1111 #define target_get_thread_local_address \
1112     (current_target.to_get_thread_local_address)
1113 #define target_get_thread_local_address_p() \
1114     (target_get_thread_local_address != NULL)
1115
1116
1117 /* Hardware watchpoint interfaces.  */
1118
1119 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1120    write).  */
1121
1122 #ifndef STOPPED_BY_WATCHPOINT
1123 #define STOPPED_BY_WATCHPOINT(w) \
1124    (*current_target.to_stopped_by_watchpoint) ()
1125 #endif
1126
1127 /* Non-zero if we have steppable watchpoints  */
1128
1129 #ifndef HAVE_STEPPABLE_WATCHPOINT
1130 #define HAVE_STEPPABLE_WATCHPOINT \
1131    (current_target.to_have_steppable_watchpoint)
1132 #endif
1133
1134 /* Non-zero if we have continuable watchpoints  */
1135
1136 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1137 #define HAVE_CONTINUABLE_WATCHPOINT \
1138    (current_target.to_have_continuable_watchpoint)
1139 #endif
1140
1141 /* Provide defaults for hardware watchpoint functions.  */
1142
1143 /* If the *_hw_beakpoint functions have not been defined
1144    elsewhere use the definitions in the target vector.  */
1145
1146 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1147    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1148    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1149    (including this one?).  OTHERTYPE is who knows what...  */
1150
1151 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1152 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1153  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1154 #endif
1155
1156 #ifndef TARGET_REGION_OK_FOR_HW_WATCHPOINT
1157 #define TARGET_REGION_OK_FOR_HW_WATCHPOINT(addr, len) \
1158     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1159 #endif
1160
1161
1162 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1163    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1164    success, non-zero for failure.  */
1165
1166 #ifndef target_insert_watchpoint
1167 #define target_insert_watchpoint(addr, len, type)       \
1168      (*current_target.to_insert_watchpoint) (addr, len, type)
1169
1170 #define target_remove_watchpoint(addr, len, type)       \
1171      (*current_target.to_remove_watchpoint) (addr, len, type)
1172 #endif
1173
1174 #ifndef target_insert_hw_breakpoint
1175 #define target_insert_hw_breakpoint(bp_tgt) \
1176      (*current_target.to_insert_hw_breakpoint) (bp_tgt)
1177
1178 #define target_remove_hw_breakpoint(bp_tgt) \
1179      (*current_target.to_remove_hw_breakpoint) (bp_tgt)
1180 #endif
1181
1182 extern int target_stopped_data_address_p (struct target_ops *);
1183
1184 #ifndef target_stopped_data_address
1185 #define target_stopped_data_address(target, x) \
1186     (*target.to_stopped_data_address) (target, x)
1187 #else
1188 /* Horrible hack to get around existing macros :-(.  */
1189 #define target_stopped_data_address_p(CURRENT_TARGET) (1)
1190 #endif
1191
1192 extern const struct target_desc *target_read_description (struct target_ops *);
1193
1194 /* Routines for maintenance of the target structures...
1195
1196    add_target:   Add a target to the list of all possible targets.
1197
1198    push_target:  Make this target the top of the stack of currently used
1199    targets, within its particular stratum of the stack.  Result
1200    is 0 if now atop the stack, nonzero if not on top (maybe
1201    should warn user).
1202
1203    unpush_target: Remove this from the stack of currently used targets,
1204    no matter where it is on the list.  Returns 0 if no
1205    change, 1 if removed from stack.
1206
1207    pop_target:   Remove the top thing on the stack of current targets.  */
1208
1209 extern void add_target (struct target_ops *);
1210
1211 extern int push_target (struct target_ops *);
1212
1213 extern int unpush_target (struct target_ops *);
1214
1215 extern void target_pre_inferior (int);
1216
1217 extern void target_preopen (int);
1218
1219 extern void pop_target (void);
1220
1221 extern CORE_ADDR target_translate_tls_address (struct objfile *objfile,
1222                                                CORE_ADDR offset);
1223
1224 /* Mark a pushed target as running or exited, for targets which do not
1225    automatically pop when not active.  */
1226
1227 void target_mark_running (struct target_ops *);
1228
1229 void target_mark_exited (struct target_ops *);
1230
1231 /* Struct section_table maps address ranges to file sections.  It is
1232    mostly used with BFD files, but can be used without (e.g. for handling
1233    raw disks, or files not in formats handled by BFD).  */
1234
1235 struct section_table
1236   {
1237     CORE_ADDR addr;             /* Lowest address in section */
1238     CORE_ADDR endaddr;          /* 1+highest address in section */
1239
1240     struct bfd_section *the_bfd_section;
1241
1242     bfd *bfd;                   /* BFD file pointer */
1243   };
1244
1245 /* Return the "section" containing the specified address.  */
1246 struct section_table *target_section_by_addr (struct target_ops *target,
1247                                               CORE_ADDR addr);
1248
1249
1250 /* From mem-break.c */
1251
1252 extern int memory_remove_breakpoint (struct bp_target_info *);
1253
1254 extern int memory_insert_breakpoint (struct bp_target_info *);
1255
1256 extern int default_memory_remove_breakpoint (struct bp_target_info *);
1257
1258 extern int default_memory_insert_breakpoint (struct bp_target_info *);
1259
1260
1261 /* From target.c */
1262
1263 extern void initialize_targets (void);
1264
1265 extern void noprocess (void);
1266
1267 extern void find_default_attach (char *, int);
1268
1269 extern void find_default_create_inferior (char *, char *, char **, int);
1270
1271 extern struct target_ops *find_run_target (void);
1272
1273 extern struct target_ops *find_core_target (void);
1274
1275 extern struct target_ops *find_target_beneath (struct target_ops *);
1276
1277 extern int target_resize_to_sections (struct target_ops *target,
1278                                       int num_added);
1279
1280 extern void remove_target_sections (bfd *abfd);
1281
1282 \f
1283 /* Stuff that should be shared among the various remote targets.  */
1284
1285 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1286    information (higher values, more information).  */
1287 extern int remote_debug;
1288
1289 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1290 extern int baud_rate;
1291 /* Timeout limit for response from target. */
1292 extern int remote_timeout;
1293
1294 \f
1295 /* Functions for helping to write a native target.  */
1296
1297 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1298 extern void store_waitstatus (struct target_waitstatus *, int);
1299
1300 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1301    targ_signal SIGNO has an equivalent ``host'' representation.  */
1302 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1303    to the shorter target_signal_p() because it is far less ambigious.
1304    In this context ``target_signal'' refers to GDB's internal
1305    representation of the target's set of signals while ``host signal''
1306    refers to the target operating system's signal.  Confused?  */
1307
1308 extern int target_signal_to_host_p (enum target_signal signo);
1309
1310 /* Convert between host signal numbers and enum target_signal's.
1311    target_signal_to_host() returns 0 and prints a warning() on GDB's
1312    console if SIGNO has no equivalent host representation.  */
1313 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1314    refering to the target operating system's signal numbering.
1315    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1316    gdb_signal'' would probably be better as it is refering to GDB's
1317    internal representation of a target operating system's signal.  */
1318
1319 extern enum target_signal target_signal_from_host (int);
1320 extern int target_signal_to_host (enum target_signal);
1321
1322 /* Convert from a number used in a GDB command to an enum target_signal.  */
1323 extern enum target_signal target_signal_from_command (int);
1324
1325 /* Any target can call this to switch to remote protocol (in remote.c). */
1326 extern void push_remote_target (char *name, int from_tty);
1327 \f
1328 /* Imported from machine dependent code */
1329
1330 /* Blank target vector entries are initialized to target_ignore. */
1331 void target_ignore (void);
1332
1333 extern struct target_ops deprecated_child_ops;
1334
1335 #endif /* !defined (TARGET_H) */