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   /* SPU target specific transfer.  See "spu-tdep.c".  */
 193   TARGET_OBJECT_SPU,
 194   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 195   TARGET_OBJECT_MEMORY,
 196   /* Memory, avoiding GDB's data cache and trusting the executable.
 197      Target implementations of to_xfer_partial never need to handle
 198      this object, and most callers should not use it.  */
 199   TARGET_OBJECT_RAW_MEMORY,
 200   /* Kernel Unwind Table.  See "ia64-tdep.c".  */
 201   TARGET_OBJECT_UNWIND_TABLE,
 202   /* Transfer auxilliary vector.  */
 203   TARGET_OBJECT_AUXV,
 204   /* StackGhost cookie.  See "sparc-tdep.c".  */
 205   TARGET_OBJECT_WCOOKIE,
 206   /* Target memory map in XML format.  */
 207   TARGET_OBJECT_MEMORY_MAP,
 208   /* Flash memory.  This object can be used to write contents to
 209      a previously erased flash memory.  Using it without erasing
 210      flash can have unexpected results.  Addresses are physical
 211      address on target, and not relative to flash start.  */
 212   TARGET_OBJECT_FLASH,
 213   /* Available target-specific features, e.g. registers and coprocessors.
 214      See "target-descriptions.c".  ANNEX should never be empty.  */
 215   TARGET_OBJECT_AVAILABLE_FEATURES,
 216   /* Currently loaded libraries, in XML format.  */
 217   TARGET_OBJECT_LIBRARIES
 218   /* Possible future objects: TARGET_OBJECT_FILE, TARGET_OBJECT_PROC, ... */
 219 };
 220
 221 /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 222    OBJECT.  The OFFSET, for a seekable object, specifies the
 223    starting point.  The ANNEX can be used to provide additional
 224    data-specific information to the target.
 225
 226    Return the number of bytes actually transfered, or -1 if the
 227    transfer is not supported or otherwise fails.  Return of a positive
 228    value less than LEN indicates that no further transfer is possible.
 229    Unlike the raw to_xfer_partial interface, callers of these
 230    functions do not need to retry partial transfers.  */
 231
 232 extern LONGEST target_read (struct target_ops *ops,
 233                             enum target_object object,
 234                             const char *annex, gdb_byte *buf,
 235                             ULONGEST offset, LONGEST len);
 236
 237 extern LONGEST target_write (struct target_ops *ops,
 238                              enum target_object object,
 239                              const char *annex, const gdb_byte *buf,
 240                              ULONGEST offset, LONGEST len);
 241
 242 /* Similar to target_write, except that it also calls PROGRESS with
 243    the number of bytes written and the opaque BATON after every
 244    successful partial write (and before the first write).  This is
 245    useful for progress reporting and user interaction while writing
 246    data.  To abort the transfer, the progress callback can throw an
 247    exception.  */
 248
 249 LONGEST target_write_with_progress (struct target_ops *ops,
 250                                     enum target_object object,
 251                                     const char *annex, const gdb_byte *buf,
 252                                     ULONGEST offset, LONGEST len,
 253                                     void (*progress) (ULONGEST, void *),
 254                                     void *baton);
 255
 256 /* Wrapper to perform a full read of unknown size.  OBJECT/ANNEX will
 257    be read using OPS.  The return value will be -1 if the transfer
 258    fails or is not supported; 0 if the object is empty; or the length
 259    of the object otherwise.  If a positive value is returned, a
 260    sufficiently large buffer will be allocated using xmalloc and
 261    returned in *BUF_P containing the contents of the object.
 262
 263    This method should be used for objects sufficiently small to store
 264    in a single xmalloc'd buffer, when no fixed bound on the object's
 265    size is known in advance.  Don't try to read TARGET_OBJECT_MEMORY
 266    through this function.  */
 267
 268 extern LONGEST target_read_alloc (struct target_ops *ops,
 269                                   enum target_object object,
 270                                   const char *annex, gdb_byte **buf_p);
 271
 272 /* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and
 273    returned as a string, allocated using xmalloc.  If an error occurs
 274    or the transfer is unsupported, NULL is returned.  Empty objects
 275    are returned as allocated but empty strings.  A warning is issued
 276    if the result contains any embedded NUL bytes.  */
 277
 278 extern char *target_read_stralloc (struct target_ops *ops,
 279                                    enum target_object object,
 280                                    const char *annex);
 281
 282 /* Wrappers to target read/write that perform memory transfers.  They
 283    throw an error if the memory transfer fails.
 284
 285    NOTE: cagney/2003-10-23: The naming schema is lifted from
 286    "frame.h".  The parameter order is lifted from get_frame_memory,
 287    which in turn lifted it from read_memory.  */
 288
 289 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 290                                gdb_byte *buf, LONGEST len);
 291 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 292                                             CORE_ADDR addr, int len);
 293 \f
 294
 295 /* If certain kinds of activity happen, target_wait should perform
 296    callbacks.  */
 297 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 298    on TARGET_ACTIVITY_FD.  */
 299 extern int target_activity_fd;
 300 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 301 extern int (*target_activity_function) (void);
 302 \f
 303 struct thread_info;             /* fwd decl for parameter list below: */
 304
 305 struct target_ops
 306   {
 307     struct target_ops *beneath; /* To the target under this one.  */
 308     char *to_shortname;         /* Name this target type */
 309     char *to_longname;          /* Name for printing */
 310     char *to_doc;               /* Documentation.  Does not include trailing
 311                                    newline, and starts with a one-line descrip-
 312                                    tion (probably similar to to_longname).  */
 313     /* Per-target scratch pad.  */
 314     void *to_data;
 315     /* The open routine takes the rest of the parameters from the
 316        command, and (if successful) pushes a new target onto the
 317        stack.  Targets should supply this routine, if only to provide
 318        an error message.  */
 319     void (*to_open) (char *, int);
 320     /* Old targets with a static target vector provide "to_close".
 321        New re-entrant targets provide "to_xclose" and that is expected
 322        to xfree everything (including the "struct target_ops").  */
 323     void (*to_xclose) (struct target_ops *targ, int quitting);
 324     void (*to_close) (int);
 325     void (*to_attach) (char *, int);
 326     void (*to_post_attach) (int);
 327     void (*to_detach) (char *, int);
 328     void (*to_disconnect) (struct target_ops *, char *, int);
 329     void (*to_resume) (ptid_t, int, enum target_signal);
 330     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 331     void (*to_fetch_registers) (struct regcache *, int);
 332     void (*to_store_registers) (struct regcache *, int);
 333     void (*to_prepare_to_store) (struct regcache *);
 334
 335     /* Transfer LEN bytes of memory between GDB address MYADDR and
 336        target address MEMADDR.  If WRITE, transfer them to the target, else
 337        transfer them from the target.  TARGET is the target from which we
 338        get this function.
 339
 340        Return value, N, is one of the following:
 341
 342        0 means that we can't handle this.  If errno has been set, it is the
 343        error which prevented us from doing it (FIXME: What about bfd_error?).
 344
 345        positive (call it N) means that we have transferred N bytes
 346        starting at MEMADDR.  We might be able to handle more bytes
 347        beyond this length, but no promises.
 348
 349        negative (call its absolute value N) means that we cannot
 350        transfer right at MEMADDR, but we could transfer at least
 351        something at MEMADDR + N.
 352
 353        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 354        to_xfer_partial and inferior inheritance.  */
 355
 356     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 357                                    int len, int write,
 358                                    struct mem_attrib *attrib,
 359                                    struct target_ops *target);
 360
 361     void (*to_files_info) (struct target_ops *);
 362     int (*to_insert_breakpoint) (struct bp_target_info *);
 363     int (*to_remove_breakpoint) (struct bp_target_info *);
 364     int (*to_can_use_hw_breakpoint) (int, int, int);
 365     int (*to_insert_hw_breakpoint) (struct bp_target_info *);
 366     int (*to_remove_hw_breakpoint) (struct bp_target_info *);
 367     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 368     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 369     int (*to_stopped_by_watchpoint) (void);
 370     int to_have_steppable_watchpoint;
 371     int to_have_continuable_watchpoint;
 372     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 373     int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);
 374     void (*to_terminal_init) (void);
 375     void (*to_terminal_inferior) (void);
 376     void (*to_terminal_ours_for_output) (void);
 377     void (*to_terminal_ours) (void);
 378     void (*to_terminal_save_ours) (void);
 379     void (*to_terminal_info) (char *, int);
 380     void (*to_kill) (void);
 381     void (*to_load) (char *, int);
 382     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 383     void (*to_create_inferior) (char *, char *, char **, int);
 384     void (*to_post_startup_inferior) (ptid_t);
 385     void (*to_acknowledge_created_inferior) (int);
 386     void (*to_insert_fork_catchpoint) (int);
 387     int (*to_remove_fork_catchpoint) (int);
 388     void (*to_insert_vfork_catchpoint) (int);
 389     int (*to_remove_vfork_catchpoint) (int);
 390     int (*to_follow_fork) (struct target_ops *, int);
 391     void (*to_insert_exec_catchpoint) (int);
 392     int (*to_remove_exec_catchpoint) (int);
 393     int (*to_reported_exec_events_per_exec_call) (void);
 394     int (*to_has_exited) (int, int, int *);
 395     void (*to_mourn_inferior) (void);
 396     int (*to_can_run) (void);
 397     void (*to_notice_signals) (ptid_t ptid);
 398     int (*to_thread_alive) (ptid_t ptid);
 399     void (*to_find_new_threads) (void);
 400     char *(*to_pid_to_str) (ptid_t);
 401     char *(*to_extra_thread_info) (struct thread_info *);
 402     void (*to_stop) (void);
 403     void (*to_rcmd) (char *command, struct ui_file *output);
 404     struct symtab_and_line *(*to_enable_exception_callback) (enum
 405                                                              exception_event_kind,
 406                                                              int);
 407     struct exception_event_record *(*to_get_current_exception_event) (void);
 408     char *(*to_pid_to_exec_file) (int pid);
 409     enum strata to_stratum;
 410     int to_has_all_memory;
 411     int to_has_memory;
 412     int to_has_stack;
 413     int to_has_registers;
 414     int to_has_execution;
 415     int to_has_thread_control;  /* control thread execution */
 416     struct section_table
 417      *to_sections;
 418     struct section_table
 419      *to_sections_end;
 420     /* ASYNC target controls */
 421     int (*to_can_async_p) (void);
 422     int (*to_is_async_p) (void);
 423     void (*to_async) (void (*cb) (enum inferior_event_type, void *context),
 424                       void *context);
 425     int to_async_mask_value;
 426     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 427                                             unsigned long,
 428                                             int, int, int,
 429                                             void *),
 430                                    void *);
 431     char * (*to_make_corefile_notes) (bfd *, int *);
 432
 433     /* Return the thread-local address at OFFSET in the
 434        thread-local storage for the thread PTID and the shared library
 435        or executable file given by OBJFILE.  If that block of
 436        thread-local storage hasn't been allocated yet, this function
 437        may return an error.  */
 438     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 439                                               CORE_ADDR load_module_addr,
 440                                               CORE_ADDR offset);
 441
 442     /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 443        OBJECT.  The OFFSET, for a seekable object, specifies the
 444        starting point.  The ANNEX can be used to provide additional
 445        data-specific information to the target.
 446
 447        Return the number of bytes actually transfered, zero when no
 448        further transfer is possible, and -1 when the transfer is not
 449        supported.  Return of a positive value smaller than LEN does
 450        not indicate the end of the object, only the end of the
 451        transfer; higher level code should continue transferring if
 452        desired.  This is handled in target.c.
 453
 454        The interface does not support a "retry" mechanism.  Instead it
 455        assumes that at least one byte will be transfered on each
 456        successful call.
 457
 458        NOTE: cagney/2003-10-17: The current interface can lead to
 459        fragmented transfers.  Lower target levels should not implement
 460        hacks, such as enlarging the transfer, in an attempt to
 461        compensate for this.  Instead, the target stack should be
 462        extended so that it implements supply/collect methods and a
 463        look-aside object cache.  With that available, the lowest
 464        target can safely and freely "push" data up the stack.
 465
 466        See target_read and target_write for more information.  One,
 467        and only one, of readbuf or writebuf must be non-NULL.  */
 468
 469     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 470                                 enum target_object object, const char *annex,
 471                                 gdb_byte *readbuf, const gdb_byte *writebuf,
 472                                 ULONGEST offset, LONGEST len);
 473
 474     /* Returns the memory map for the target.  A return value of NULL
 475        means that no memory map is available.  If a memory address
 476        does not fall within any returned regions, it's assumed to be
 477        RAM.  The returned memory regions should not overlap.
 478
 479        The order of regions does not matter; target_memory_map will
 480        sort regions by starting address. For that reason, this
 481        function should not be called directly except via
 482        target_memory_map.
 483
 484        This method should not cache data; if the memory map could
 485        change unexpectedly, it should be invalidated, and higher
 486        layers will re-fetch it.  */
 487     VEC(mem_region_s) *(*to_memory_map) (struct target_ops *);
 488
 489     /* Erases the region of flash memory starting at ADDRESS, of
 490        length LENGTH.
 491
 492        Precondition: both ADDRESS and ADDRESS+LENGTH should be aligned
 493        on flash block boundaries, as reported by 'to_memory_map'.  */
 494     void (*to_flash_erase) (struct target_ops *,
 495                            ULONGEST address, LONGEST length);
 496
 497     /* Finishes a flash memory write sequence.  After this operation
 498        all flash memory should be available for writing and the result
 499        of reading from areas written by 'to_flash_write' should be
 500        equal to what was written.  */
 501     void (*to_flash_done) (struct target_ops *);
 502
 503     /* Describe the architecture-specific features of this target.
 504        Returns the description found, or NULL if no description
 505        was available.  */
 506     const struct target_desc *(*to_read_description) (struct target_ops *ops);
 507
 508     int to_magic;
 509     /* Need sub-structure for target machine related rather than comm related?
 510      */
 511   };
 512
 513 /* Magic number for checking ops size.  If a struct doesn't end with this
 514    number, somebody changed the declaration but didn't change all the
 515    places that initialize one.  */
 516
 517 #define OPS_MAGIC       3840
 518
 519 /* The ops structure for our "current" target process.  This should
 520    never be NULL.  If there is no target, it points to the dummy_target.  */
 521
 522 extern struct target_ops current_target;
 523
 524 /* Define easy words for doing these operations on our current target.  */
 525
 526 #define target_shortname        (current_target.to_shortname)
 527 #define target_longname         (current_target.to_longname)
 528
 529 /* Does whatever cleanup is required for a target that we are no
 530    longer going to be calling.  QUITTING indicates that GDB is exiting
 531    and should not get hung on an error (otherwise it is important to
 532    perform clean termination, even if it takes a while).  This routine
 533    is automatically always called when popping the target off the
 534    target stack (to_beneath is undefined).  Closing file descriptors
 535    and freeing all memory allocated memory are typical things it
 536    should do.  */
 537
 538 void target_close (struct target_ops *targ, int quitting);
 539
 540 /* Attaches to a process on the target side.  Arguments are as passed
 541    to the `attach' command by the user.  This routine can be called
 542    when the target is not on the target-stack, if the target_can_run
 543    routine returns 1; in that case, it must push itself onto the stack.
 544    Upon exit, the target should be ready for normal operations, and
 545    should be ready to deliver the status of the process immediately
 546    (without waiting) to an upcoming target_wait call.  */
 547
 548 #define target_attach(args, from_tty)   \
 549      (*current_target.to_attach) (args, from_tty)
 550
 551 /* The target_attach operation places a process under debugger control,
 552    and stops the process.
 553
 554    This operation provides a target-specific hook that allows the
 555    necessary bookkeeping to be performed after an attach completes.  */
 556 #define target_post_attach(pid) \
 557      (*current_target.to_post_attach) (pid)
 558
 559 /* Takes a program previously attached to and detaches it.
 560    The program may resume execution (some targets do, some don't) and will
 561    no longer stop on signals, etc.  We better not have left any breakpoints
 562    in the program or it'll die when it hits one.  ARGS is arguments
 563    typed by the user (e.g. a signal to send the process).  FROM_TTY
 564    says whether to be verbose or not.  */
 565
 566 extern void target_detach (char *, int);
 567
 568 /* Disconnect from the current target without resuming it (leaving it
 569    waiting for a debugger).  */
 570
 571 extern void target_disconnect (char *, int);
 572
 573 /* Resume execution of the target process PTID.  STEP says whether to
 574    single-step or to run free; SIGGNAL is the signal to be given to
 575    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 576    pass TARGET_SIGNAL_DEFAULT.  */
 577
 578 #define target_resume(ptid, step, siggnal)                              \
 579   do {                                                                  \
 580     dcache_invalidate(target_dcache);                                   \
 581     (*current_target.to_resume) (ptid, step, siggnal);                  \
 582   } while (0)
 583
 584 /* Wait for process pid to do something.  PTID = -1 to wait for any
 585    pid to do something.  Return pid of child, or -1 in case of error;
 586    store status through argument pointer STATUS.  Note that it is
 587    _NOT_ OK to throw_exception() out of target_wait() without popping
 588    the debugging target from the stack; GDB isn't prepared to get back
 589    to the prompt with a debugging target but without the frame cache,
 590    stop_pc, etc., set up.  */
 591
 592 #define target_wait(ptid, status)               \
 593      (*current_target.to_wait) (ptid, status)
 594
 595 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 596
 597 #define target_fetch_registers(regcache, regno) \
 598      (*current_target.to_fetch_registers) (regcache, regno)
 599
 600 /* Store at least register REGNO, or all regs if REGNO == -1.
 601    It can store as many registers as it wants to, so target_prepare_to_store
 602    must have been previously called.  Calls error() if there are problems.  */
 603
 604 #define target_store_registers(regcache, regs)  \
 605      (*current_target.to_store_registers) (regcache, regs)
 606
 607 /* Get ready to modify the registers array.  On machines which store
 608    individual registers, this doesn't need to do anything.  On machines
 609    which store all the registers in one fell swoop, this makes sure
 610    that REGISTERS contains all the registers from the program being
 611    debugged.  */
 612
 613 #define target_prepare_to_store(regcache)       \
 614      (*current_target.to_prepare_to_store) (regcache)
 615
 616 extern DCACHE *target_dcache;
 617
 618 extern int target_read_string (CORE_ADDR, char **, int, int *);
 619
 620 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 621
 622 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 623                                 int len);
 624
 625 extern int xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 626                         struct mem_attrib *, struct target_ops *);
 627
 628 /* Fetches the target's memory map.  If one is found it is sorted
 629    and returned, after some consistency checking.  Otherwise, NULL
 630    is returned.  */
 631 VEC(mem_region_s) *target_memory_map (void);
 632
 633 /* Erase the specified flash region.  */
 634 void target_flash_erase (ULONGEST address, LONGEST length);
 635
 636 /* Finish a sequence of flash operations.  */
 637 void target_flash_done (void);
 638
 639 /* Describes a request for a memory write operation.  */
 640 struct memory_write_request
 641   {
 642     /* Begining address that must be written. */
 643     ULONGEST begin;
 644     /* Past-the-end address. */
 645     ULONGEST end;
 646     /* The data to write. */
 647     gdb_byte *data;
 648     /* A callback baton for progress reporting for this request.  */
 649     void *baton;
 650   };
 651 typedef struct memory_write_request memory_write_request_s;
 652 DEF_VEC_O(memory_write_request_s);
 653
 654 /* Enumeration specifying different flash preservation behaviour.  */
 655 enum flash_preserve_mode
 656   {
 657     flash_preserve,
 658     flash_discard
 659   };
 660
 661 /* Write several memory blocks at once.  This version can be more
 662    efficient than making several calls to target_write_memory, in
 663    particular because it can optimize accesses to flash memory.
 664
 665    Moreover, this is currently the only memory access function in gdb
 666    that supports writing to flash memory, and it should be used for
 667    all cases where access to flash memory is desirable.
 668
 669    REQUESTS is the vector (see vec.h) of memory_write_request.
 670    PRESERVE_FLASH_P indicates what to do with blocks which must be
 671      erased, but not completely rewritten.
 672    PROGRESS_CB is a function that will be periodically called to provide
 673      feedback to user.  It will be called with the baton corresponding
 674      to the request currently being written.  It may also be called
 675      with a NULL baton, when preserved flash sectors are being rewritten.
 676
 677    The function returns 0 on success, and error otherwise.  */
 678 int target_write_memory_blocks (VEC(memory_write_request_s) *requests,
 679                                 enum flash_preserve_mode preserve_flash_p,
 680                                 void (*progress_cb) (ULONGEST, void *));
 681
 682 /* From infrun.c.  */
 683
 684 extern int inferior_has_forked (int pid, int *child_pid);
 685
 686 extern int inferior_has_vforked (int pid, int *child_pid);
 687
 688 extern int inferior_has_execd (int pid, char **execd_pathname);
 689
 690 /* From exec.c */
 691
 692 extern void print_section_info (struct target_ops *, bfd *);
 693
 694 /* Print a line about the current target.  */
 695
 696 #define target_files_info()     \
 697      (*current_target.to_files_info) (&current_target)
 698
 699 /* Insert a breakpoint at address BP_TGT->placed_address in the target
 700    machine.  Result is 0 for success, or an errno value.  */
 701
 702 #define target_insert_breakpoint(bp_tgt)        \
 703      (*current_target.to_insert_breakpoint) (bp_tgt)
 704
 705 /* Remove a breakpoint at address BP_TGT->placed_address in the target
 706    machine.  Result is 0 for success, or an errno value.  */
 707
 708 #define target_remove_breakpoint(bp_tgt)        \
 709      (*current_target.to_remove_breakpoint) (bp_tgt)
 710
 711 /* Initialize the terminal settings we record for the inferior,
 712    before we actually run the inferior.  */
 713
 714 #define target_terminal_init() \
 715      (*current_target.to_terminal_init) ()
 716
 717 /* Put the inferior's terminal settings into effect.
 718    This is preparation for starting or resuming the inferior.  */
 719
 720 #define target_terminal_inferior() \
 721      (*current_target.to_terminal_inferior) ()
 722
 723 /* Put some of our terminal settings into effect,
 724    enough to get proper results from our output,
 725    but do not change into or out of RAW mode
 726    so that no input is discarded.
 727
 728    After doing this, either terminal_ours or terminal_inferior
 729    should be called to get back to a normal state of affairs.  */
 730
 731 #define target_terminal_ours_for_output() \
 732      (*current_target.to_terminal_ours_for_output) ()
 733
 734 /* Put our terminal settings into effect.
 735    First record the inferior's terminal settings
 736    so they can be restored properly later.  */
 737
 738 #define target_terminal_ours() \
 739      (*current_target.to_terminal_ours) ()
 740
 741 /* Save our terminal settings.
 742    This is called from TUI after entering or leaving the curses
 743    mode.  Since curses modifies our terminal this call is here
 744    to take this change into account.  */
 745
 746 #define target_terminal_save_ours() \
 747      (*current_target.to_terminal_save_ours) ()
 748
 749 /* Print useful information about our terminal status, if such a thing
 750    exists.  */
 751
 752 #define target_terminal_info(arg, from_tty) \
 753      (*current_target.to_terminal_info) (arg, from_tty)
 754
 755 /* Kill the inferior process.   Make it go away.  */
 756
 757 #define target_kill() \
 758      (*current_target.to_kill) ()
 759
 760 /* Load an executable file into the target process.  This is expected
 761    to not only bring new code into the target process, but also to
 762    update GDB's symbol tables to match.
 763
 764    ARG contains command-line arguments, to be broken down with
 765    buildargv ().  The first non-switch argument is the filename to
 766    load, FILE; the second is a number (as parsed by strtoul (..., ...,
 767    0)), which is an offset to apply to the load addresses of FILE's
 768    sections.  The target may define switches, or other non-switch
 769    arguments, as it pleases.  */
 770
 771 extern void target_load (char *arg, int from_tty);
 772
 773 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 774    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 775    symbol should be returned.  The result is 0 if successful, nonzero
 776    if the symbol does not exist in the target environment.  This
 777    function should not call error() if communication with the target
 778    is interrupted, since it is called from symbol reading, but should
 779    return nonzero, possibly doing a complain().  */
 780
 781 #define target_lookup_symbol(name, addrp) \
 782      (*current_target.to_lookup_symbol) (name, addrp)
 783
 784 /* Start an inferior process and set inferior_ptid to its pid.
 785    EXEC_FILE is the file to run.
 786    ALLARGS is a string containing the arguments to the program.
 787    ENV is the environment vector to pass.  Errors reported with error().
 788    On VxWorks and various standalone systems, we ignore exec_file.  */
 789
 790 #define target_create_inferior(exec_file, args, env, FROM_TTY)  \
 791      (*current_target.to_create_inferior) (exec_file, args, env, (FROM_TTY))
 792
 793
 794 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 795    notification of inferior events such as fork and vork immediately
 796    after the inferior is created.  (This because of how gdb gets an
 797    inferior created via invoking a shell to do it.  In such a scenario,
 798    if the shell init file has commands in it, the shell will fork and
 799    exec for each of those commands, and we will see each such fork
 800    event.  Very bad.)
 801
 802    Such targets will supply an appropriate definition for this function.  */
 803
 804 #define target_post_startup_inferior(ptid) \
 805      (*current_target.to_post_startup_inferior) (ptid)
 806
 807 /* On some targets, the sequence of starting up an inferior requires
 808    some synchronization between gdb and the new inferior process, PID.  */
 809
 810 #define target_acknowledge_created_inferior(pid) \
 811      (*current_target.to_acknowledge_created_inferior) (pid)
 812
 813 /* On some targets, we can catch an inferior fork or vfork event when
 814    it occurs.  These functions insert/remove an already-created
 815    catchpoint for such events.  */
 816
 817 #define target_insert_fork_catchpoint(pid) \
 818      (*current_target.to_insert_fork_catchpoint) (pid)
 819
 820 #define target_remove_fork_catchpoint(pid) \
 821      (*current_target.to_remove_fork_catchpoint) (pid)
 822
 823 #define target_insert_vfork_catchpoint(pid) \
 824      (*current_target.to_insert_vfork_catchpoint) (pid)
 825
 826 #define target_remove_vfork_catchpoint(pid) \
 827      (*current_target.to_remove_vfork_catchpoint) (pid)
 828
 829 /* If the inferior forks or vforks, this function will be called at
 830    the next resume in order to perform any bookkeeping and fiddling
 831    necessary to continue debugging either the parent or child, as
 832    requested, and releasing the other.  Information about the fork
 833    or vfork event is available via get_last_target_status ().
 834    This function returns 1 if the inferior should not be resumed
 835    (i.e. there is another event pending).  */
 836
 837 int target_follow_fork (int follow_child);
 838
 839 /* On some targets, we can catch an inferior exec event when it
 840    occurs.  These functions insert/remove an already-created
 841    catchpoint for such events.  */
 842
 843 #define target_insert_exec_catchpoint(pid) \
 844      (*current_target.to_insert_exec_catchpoint) (pid)
 845
 846 #define target_remove_exec_catchpoint(pid) \
 847      (*current_target.to_remove_exec_catchpoint) (pid)
 848
 849 /* Returns the number of exec events that are reported when a process
 850    invokes a flavor of the exec() system call on this target, if exec
 851    events are being reported.  */
 852
 853 #define target_reported_exec_events_per_exec_call() \
 854      (*current_target.to_reported_exec_events_per_exec_call) ()
 855
 856 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 857    exit code of PID, if any.  */
 858
 859 #define target_has_exited(pid,wait_status,exit_status) \
 860      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 861
 862 /* The debugger has completed a blocking wait() call.  There is now
 863    some process event that must be processed.  This function should
 864    be defined by those targets that require the debugger to perform
 865    cleanup or internal state changes in response to the process event.  */
 866
 867 /* The inferior process has died.  Do what is right.  */
 868
 869 #define target_mourn_inferior() \
 870      (*current_target.to_mourn_inferior) ()
 871
 872 /* Does target have enough data to do a run or attach command? */
 873
 874 #define target_can_run(t) \
 875      ((t)->to_can_run) ()
 876
 877 /* post process changes to signal handling in the inferior.  */
 878
 879 #define target_notice_signals(ptid) \
 880      (*current_target.to_notice_signals) (ptid)
 881
 882 /* Check to see if a thread is still alive.  */
 883
 884 #define target_thread_alive(ptid) \
 885      (*current_target.to_thread_alive) (ptid)
 886
 887 /* Query for new threads and add them to the thread list.  */
 888
 889 #define target_find_new_threads() \
 890      (*current_target.to_find_new_threads) (); \
 891
 892 /* Make target stop in a continuable fashion.  (For instance, under
 893    Unix, this should act like SIGSTOP).  This function is normally
 894    used by GUIs to implement a stop button.  */
 895
 896 #define target_stop current_target.to_stop
 897
 898 /* Send the specified COMMAND to the target's monitor
 899    (shell,interpreter) for execution.  The result of the query is
 900    placed in OUTBUF.  */
 901
 902 #define target_rcmd(command, outbuf) \
 903      (*current_target.to_rcmd) (command, outbuf)
 904
 905
 906 /* Get the symbol information for a breakpointable routine called when
 907    an exception event occurs.
 908    Intended mainly for C++, and for those
 909    platforms/implementations where such a callback mechanism is available,
 910    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 911    different mechanisms for debugging exceptions.  */
 912
 913 #define target_enable_exception_callback(kind, enable) \
 914      (*current_target.to_enable_exception_callback) (kind, enable)
 915
 916 /* Get the current exception event kind -- throw or catch, etc.  */
 917
 918 #define target_get_current_exception_event() \
 919      (*current_target.to_get_current_exception_event) ()
 920
 921 /* Does the target include all of memory, or only part of it?  This
 922    determines whether we look up the target chain for other parts of
 923    memory if this target can't satisfy a request.  */
 924
 925 #define target_has_all_memory   \
 926      (current_target.to_has_all_memory)
 927
 928 /* Does the target include memory?  (Dummy targets don't.)  */
 929
 930 #define target_has_memory       \
 931      (current_target.to_has_memory)
 932
 933 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 934    we start a process.)  */
 935
 936 #define target_has_stack        \
 937      (current_target.to_has_stack)
 938
 939 /* Does the target have registers?  (Exec files don't.)  */
 940
 941 #define target_has_registers    \
 942      (current_target.to_has_registers)
 943
 944 /* Does the target have execution?  Can we make it jump (through
 945    hoops), or pop its stack a few times?  This means that the current
 946    target is currently executing; for some targets, that's the same as
 947    whether or not the target is capable of execution, but there are
 948    also targets which can be current while not executing.  In that
 949    case this will become true after target_create_inferior or
 950    target_attach.  */
 951
 952 #define target_has_execution    \
 953      (current_target.to_has_execution)
 954
 955 /* Can the target support the debugger control of thread execution?
 956    a) Can it lock the thread scheduler?
 957    b) Can it switch the currently running thread?  */
 958
 959 #define target_can_lock_scheduler \
 960      (current_target.to_has_thread_control & tc_schedlock)
 961
 962 #define target_can_switch_threads \
 963      (current_target.to_has_thread_control & tc_switch)
 964
 965 /* Can the target support asynchronous execution? */
 966 #define target_can_async_p() (current_target.to_can_async_p ())
 967
 968 /* Is the target in asynchronous execution mode? */
 969 #define target_is_async_p() (current_target.to_is_async_p())
 970
 971 /* Put the target in async mode with the specified callback function. */
 972 #define target_async(CALLBACK,CONTEXT) \
 973      (current_target.to_async((CALLBACK), (CONTEXT)))
 974
 975 /* This is to be used ONLY within call_function_by_hand(). It provides
 976    a workaround, to have inferior function calls done in sychronous
 977    mode, even though the target is asynchronous. After
 978    target_async_mask(0) is called, calls to target_can_async_p() will
 979    return FALSE , so that target_resume() will not try to start the
 980    target asynchronously. After the inferior stops, we IMMEDIATELY
 981    restore the previous nature of the target, by calling
 982    target_async_mask(1). After that, target_can_async_p() will return
 983    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 984
 985    FIXME ezannoni 1999-12-13: we won't need this once we move
 986    the turning async on and off to the single execution commands,
 987    from where it is done currently, in remote_resume().  */
 988
 989 #define target_async_mask_value \
 990      (current_target.to_async_mask_value)
 991
 992 extern int target_async_mask (int mask);
 993
 994 /* Converts a process id to a string.  Usually, the string just contains
 995    `process xyz', but on some systems it may contain
 996    `process xyz thread abc'.  */
 997
 998 #undef target_pid_to_str
 999 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
1000
1001 #ifndef target_tid_to_str
1002 #define target_tid_to_str(PID) \
1003      target_pid_to_str (PID)
1004 extern char *normal_pid_to_str (ptid_t ptid);
1005 #endif
1006
1007 /* Return a short string describing extra information about PID,
1008    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
1009    is okay.  */
1010
1011 #define target_extra_thread_info(TP) \
1012      (current_target.to_extra_thread_info (TP))
1013
1014 #ifndef target_pid_or_tid_to_str
1015 #define target_pid_or_tid_to_str(ID) \
1016      target_pid_to_str (ID)
1017 #endif
1018
1019 /* Attempts to find the pathname of the executable file
1020    that was run to create a specified process.
1021
1022    The process PID must be stopped when this operation is used.
1023
1024    If the executable file cannot be determined, NULL is returned.
1025
1026    Else, a pointer to a character string containing the pathname
1027    is returned.  This string should be copied into a buffer by
1028    the client if the string will not be immediately used, or if
1029    it must persist.  */
1030
1031 #define target_pid_to_exec_file(pid) \
1032      (current_target.to_pid_to_exec_file) (pid)
1033
1034 /*
1035  * Iterator function for target memory regions.
1036  * Calls a callback function once for each memory region 'mapped'
1037  * in the child process.  Defined as a simple macro rather than
1038  * as a function macro so that it can be tested for nullity.
1039  */
1040
1041 #define target_find_memory_regions(FUNC, DATA) \
1042      (current_target.to_find_memory_regions) (FUNC, DATA)
1043
1044 /*
1045  * Compose corefile .note section.
1046  */
1047
1048 #define target_make_corefile_notes(BFD, SIZE_P) \
1049      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1050
1051 /* Thread-local values.  */
1052 #define target_get_thread_local_address \
1053     (current_target.to_get_thread_local_address)
1054 #define target_get_thread_local_address_p() \
1055     (target_get_thread_local_address != NULL)
1056
1057
1058 /* Hardware watchpoint interfaces.  */
1059
1060 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1061    write).  */
1062
1063 #ifndef STOPPED_BY_WATCHPOINT
1064 #define STOPPED_BY_WATCHPOINT(w) \
1065    (*current_target.to_stopped_by_watchpoint) ()
1066 #endif
1067
1068 /* Non-zero if we have steppable watchpoints  */
1069
1070 #ifndef HAVE_STEPPABLE_WATCHPOINT
1071 #define HAVE_STEPPABLE_WATCHPOINT \
1072    (current_target.to_have_steppable_watchpoint)
1073 #endif
1074
1075 /* Non-zero if we have continuable watchpoints  */
1076
1077 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1078 #define HAVE_CONTINUABLE_WATCHPOINT \
1079    (current_target.to_have_continuable_watchpoint)
1080 #endif
1081
1082 /* Provide defaults for hardware watchpoint functions.  */
1083
1084 /* If the *_hw_beakpoint functions have not been defined
1085    elsewhere use the definitions in the target vector.  */
1086
1087 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1088    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1089    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1090    (including this one?).  OTHERTYPE is who knows what...  */
1091
1092 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1093 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1094  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1095 #endif
1096
1097 #ifndef TARGET_REGION_OK_FOR_HW_WATCHPOINT
1098 #define TARGET_REGION_OK_FOR_HW_WATCHPOINT(addr, len) \
1099     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1100 #endif
1101
1102
1103 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1104    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1105    success, non-zero for failure.  */
1106
1107 #ifndef target_insert_watchpoint
1108 #define target_insert_watchpoint(addr, len, type)       \
1109      (*current_target.to_insert_watchpoint) (addr, len, type)
1110
1111 #define target_remove_watchpoint(addr, len, type)       \
1112      (*current_target.to_remove_watchpoint) (addr, len, type)
1113 #endif
1114
1115 #ifndef target_insert_hw_breakpoint
1116 #define target_insert_hw_breakpoint(bp_tgt) \
1117      (*current_target.to_insert_hw_breakpoint) (bp_tgt)
1118
1119 #define target_remove_hw_breakpoint(bp_tgt) \
1120      (*current_target.to_remove_hw_breakpoint) (bp_tgt)
1121 #endif
1122
1123 extern int target_stopped_data_address_p (struct target_ops *);
1124
1125 #ifndef target_stopped_data_address
1126 #define target_stopped_data_address(target, x) \
1127     (*target.to_stopped_data_address) (target, x)
1128 #else
1129 /* Horrible hack to get around existing macros :-(.  */
1130 #define target_stopped_data_address_p(CURRENT_TARGET) (1)
1131 #endif
1132
1133 extern const struct target_desc *target_read_description (struct target_ops *);
1134
1135 /* Routines for maintenance of the target structures...
1136
1137    add_target:   Add a target to the list of all possible targets.
1138
1139    push_target:  Make this target the top of the stack of currently used
1140    targets, within its particular stratum of the stack.  Result
1141    is 0 if now atop the stack, nonzero if not on top (maybe
1142    should warn user).
1143
1144    unpush_target: Remove this from the stack of currently used targets,
1145    no matter where it is on the list.  Returns 0 if no
1146    change, 1 if removed from stack.
1147
1148    pop_target:   Remove the top thing on the stack of current targets.  */
1149
1150 extern void add_target (struct target_ops *);
1151
1152 extern int push_target (struct target_ops *);
1153
1154 extern int unpush_target (struct target_ops *);
1155
1156 extern void target_pre_inferior (int);
1157
1158 extern void target_preopen (int);
1159
1160 extern void pop_target (void);
1161
1162 extern CORE_ADDR target_translate_tls_address (struct objfile *objfile,
1163                                                CORE_ADDR offset);
1164
1165 /* Mark a pushed target as running or exited, for targets which do not
1166    automatically pop when not active.  */
1167
1168 void target_mark_running (struct target_ops *);
1169
1170 void target_mark_exited (struct target_ops *);
1171
1172 /* Struct section_table maps address ranges to file sections.  It is
1173    mostly used with BFD files, but can be used without (e.g. for handling
1174    raw disks, or files not in formats handled by BFD).  */
1175
1176 struct section_table
1177   {
1178     CORE_ADDR addr;             /* Lowest address in section */
1179     CORE_ADDR endaddr;          /* 1+highest address in section */
1180
1181     struct bfd_section *the_bfd_section;
1182
1183     bfd *bfd;                   /* BFD file pointer */
1184   };
1185
1186 /* Return the "section" containing the specified address.  */
1187 struct section_table *target_section_by_addr (struct target_ops *target,
1188                                               CORE_ADDR addr);
1189
1190
1191 /* From mem-break.c */
1192
1193 extern int memory_remove_breakpoint (struct bp_target_info *);
1194
1195 extern int memory_insert_breakpoint (struct bp_target_info *);
1196
1197 extern int default_memory_remove_breakpoint (struct bp_target_info *);
1198
1199 extern int default_memory_insert_breakpoint (struct bp_target_info *);
1200
1201
1202 /* From target.c */
1203
1204 extern void initialize_targets (void);
1205
1206 extern void noprocess (void);
1207
1208 extern void find_default_attach (char *, int);
1209
1210 extern void find_default_create_inferior (char *, char *, char **, int);
1211
1212 extern struct target_ops *find_run_target (void);
1213
1214 extern struct target_ops *find_core_target (void);
1215
1216 extern struct target_ops *find_target_beneath (struct target_ops *);
1217
1218 extern int target_resize_to_sections (struct target_ops *target,
1219                                       int num_added);
1220
1221 extern void remove_target_sections (bfd *abfd);
1222
1223 \f
1224 /* Stuff that should be shared among the various remote targets.  */
1225
1226 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1227    information (higher values, more information).  */
1228 extern int remote_debug;
1229
1230 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1231 extern int baud_rate;
1232 /* Timeout limit for response from target. */
1233 extern int remote_timeout;
1234
1235 \f
1236 /* Functions for helping to write a native target.  */
1237
1238 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1239 extern void store_waitstatus (struct target_waitstatus *, int);
1240
1241 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1242    targ_signal SIGNO has an equivalent ``host'' representation.  */
1243 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1244    to the shorter target_signal_p() because it is far less ambigious.
1245    In this context ``target_signal'' refers to GDB's internal
1246    representation of the target's set of signals while ``host signal''
1247    refers to the target operating system's signal.  Confused?  */
1248
1249 extern int target_signal_to_host_p (enum target_signal signo);
1250
1251 /* Convert between host signal numbers and enum target_signal's.
1252    target_signal_to_host() returns 0 and prints a warning() on GDB's
1253    console if SIGNO has no equivalent host representation.  */
1254 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1255    refering to the target operating system's signal numbering.
1256    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1257    gdb_signal'' would probably be better as it is refering to GDB's
1258    internal representation of a target operating system's signal.  */
1259
1260 extern enum target_signal target_signal_from_host (int);
1261 extern int target_signal_to_host (enum target_signal);
1262
1263 /* Convert from a number used in a GDB command to an enum target_signal.  */
1264 extern enum target_signal target_signal_from_command (int);
1265
1266 /* Any target can call this to switch to remote protocol (in remote.c). */
1267 extern void push_remote_target (char *name, int from_tty);
1268 \f
1269 /* Imported from machine dependent code */
1270
1271 /* Blank target vector entries are initialized to target_ignore. */
1272 void target_ignore (void);
1273
1274 extern struct target_ops deprecated_child_ops;
1275
1276 #endif /* !defined (TARGET_H) */