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 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  23
  24 #if !defined (TARGET_H)
  25 #define TARGET_H
  26
  27 struct objfile;
  28 struct ui_file;
  29 struct mem_attrib;
  30 struct target_ops;
  31 struct bp_target_info;
  32 struct regcache;
  33
  34 /* This include file defines the interface between the main part
  35    of the debugger, and the part which is target-specific, or
  36    specific to the communications interface between us and the
  37    target.
  38
  39    A TARGET is an interface between the debugger and a particular
  40    kind of file or process.  Targets can be STACKED in STRATA,
  41    so that more than one target can potentially respond to a request.
  42    In particular, memory accesses will walk down the stack of targets
  43    until they find a target that is interested in handling that particular
  44    address.  STRATA are artificial boundaries on the stack, within
  45    which particular kinds of targets live.  Strata exist so that
  46    people don't get confused by pushing e.g. a process target and then
  47    a file target, and wondering why they can't see the current values
  48    of variables any more (the file target is handling them and they
  49    never get to the process target).  So when you push a file target,
  50    it goes into the file stratum, which is always below the process
  51    stratum.  */
  52
  53 #include "bfd.h"
  54 #include "symtab.h"
  55 #include "dcache.h"
  56 #include "memattr.h"
  57 #include "vec.h"
  58
  59 enum strata
  60   {
  61     dummy_stratum,              /* The lowest of the low */
  62     file_stratum,               /* Executable files, etc */
  63     core_stratum,               /* Core dump files */
  64     download_stratum,           /* Downloading of remote targets */
  65     process_stratum,            /* Executing processes */
  66     thread_stratum              /* Executing threads */
  67   };
  68
  69 enum thread_control_capabilities
  70   {
  71     tc_none = 0,                /* Default: can't control thread execution.  */
  72     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  73     tc_switch = 2               /* Can switch the running thread on demand.  */
  74   };
  75
  76 /* Stuff for target_wait.  */
  77
  78 /* Generally, what has the program done?  */
  79 enum target_waitkind
  80   {
  81     /* The program has exited.  The exit status is in value.integer.  */
  82     TARGET_WAITKIND_EXITED,
  83
  84     /* The program has stopped with a signal.  Which signal is in
  85        value.sig.  */
  86     TARGET_WAITKIND_STOPPED,
  87
  88     /* The program has terminated with a signal.  Which signal is in
  89        value.sig.  */
  90     TARGET_WAITKIND_SIGNALLED,
  91
  92     /* The program is letting us know that it dynamically loaded something
  93        (e.g. it called load(2) on AIX).  */
  94     TARGET_WAITKIND_LOADED,
  95
  96     /* The program has forked.  A "related" process' ID is in
  97        value.related_pid.  I.e., if the child forks, value.related_pid
  98        is the parent's ID.  */
  99
 100     TARGET_WAITKIND_FORKED,
 101
 102     /* The program has vforked.  A "related" process's ID is in
 103        value.related_pid.  */
 104
 105     TARGET_WAITKIND_VFORKED,
 106
 107     /* The program has exec'ed a new executable file.  The new file's
 108        pathname is pointed to by value.execd_pathname.  */
 109
 110     TARGET_WAITKIND_EXECD,
 111
 112     /* The program has entered or returned from a system call.  On
 113        HP-UX, this is used in the hardware watchpoint implementation.
 114        The syscall's unique integer ID number is in value.syscall_id */
 115
 116     TARGET_WAITKIND_SYSCALL_ENTRY,
 117     TARGET_WAITKIND_SYSCALL_RETURN,
 118
 119     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 120        within target_wait, but I'm not sure target_wait should be resuming the
 121        inferior.  */
 122     TARGET_WAITKIND_SPURIOUS,
 123
 124     /* An event has occured, but we should wait again.
 125        Remote_async_wait() returns this when there is an event
 126        on the inferior, but the rest of the world is not interested in
 127        it. The inferior has not stopped, but has just sent some output
 128        to the console, for instance. In this case, we want to go back
 129        to the event loop and wait there for another event from the
 130        inferior, rather than being stuck in the remote_async_wait()
 131        function. This way the event loop is responsive to other events,
 132        like for instance the user typing.  */
 133     TARGET_WAITKIND_IGNORE
 134   };
 135
 136 struct target_waitstatus
 137   {
 138     enum target_waitkind kind;
 139
 140     /* Forked child pid, execd pathname, exit status or signal number.  */
 141     union
 142       {
 143         int integer;
 144         enum target_signal sig;
 145         int related_pid;
 146         char *execd_pathname;
 147         int syscall_id;
 148       }
 149     value;
 150   };
 151
 152 /* Possible types of events that the inferior handler will have to
 153    deal with.  */
 154 enum inferior_event_type
 155   {
 156     /* There is a request to quit the inferior, abandon it.  */
 157     INF_QUIT_REQ,
 158     /* Process a normal inferior event which will result in target_wait
 159        being called.  */
 160     INF_REG_EVENT,
 161     /* Deal with an error on the inferior.  */
 162     INF_ERROR,
 163     /* We are called because a timer went off.  */
 164     INF_TIMER,
 165     /* We are called to do stuff after the inferior stops.  */
 166     INF_EXEC_COMPLETE,
 167     /* We are called to do some stuff after the inferior stops, but we
 168        are expected to reenter the proceed() and
 169        handle_inferior_event() functions. This is used only in case of
 170        'step n' like commands.  */
 171     INF_EXEC_CONTINUE
 172   };
 173
 174 /* Return the string for a signal.  */
 175 extern char *target_signal_to_string (enum target_signal);
 176
 177 /* Return the name (SIGHUP, etc.) for a signal.  */
 178 extern char *target_signal_to_name (enum target_signal);
 179
 180 /* Given a name (SIGHUP, etc.), return its signal.  */
 181 enum target_signal target_signal_from_name (char *);
 182 \f
 183 /* Target objects which can be transfered using target_read,
 184    target_write, et cetera.  */
 185
 186 enum target_object
 187 {
 188   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 189   TARGET_OBJECT_AVR,
 190   /* SPU target specific transfer.  See "spu-tdep.c".  */
 191   TARGET_OBJECT_SPU,
 192   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 193   TARGET_OBJECT_MEMORY,
 194   /* Memory, avoiding GDB's data cache and trusting the executable.
 195      Target implementations of to_xfer_partial never need to handle
 196      this object, and most callers should not use it.  */
 197   TARGET_OBJECT_RAW_MEMORY,
 198   /* Kernel Unwind Table.  See "ia64-tdep.c".  */
 199   TARGET_OBJECT_UNWIND_TABLE,
 200   /* Transfer auxilliary vector.  */
 201   TARGET_OBJECT_AUXV,
 202   /* StackGhost cookie.  See "sparc-tdep.c".  */
 203   TARGET_OBJECT_WCOOKIE,
 204   /* Target memory map in XML format.  */
 205   TARGET_OBJECT_MEMORY_MAP,
 206   /* Flash memory.  This object can be used to write contents to
 207      a previously erased flash memory.  Using it without erasing
 208      flash can have unexpected results.  Addresses are physical
 209      address on target, and not relative to flash start.  */
 210   TARGET_OBJECT_FLASH,
 211   /* Available target-specific features, e.g. registers and coprocessors.
 212      See "target-descriptions.c".  ANNEX should never be empty.  */
 213   TARGET_OBJECT_AVAILABLE_FEATURES,
 214   /* Currently loaded libraries, in XML format.  */
 215   TARGET_OBJECT_LIBRARIES
 216   /* Possible future objects: TARGET_OBJECT_FILE, TARGET_OBJECT_PROC, ... */
 217 };
 218
 219 /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 220    OBJECT.  The OFFSET, for a seekable object, specifies the
 221    starting point.  The ANNEX can be used to provide additional
 222    data-specific information to the target.
 223
 224    Return the number of bytes actually transfered, or -1 if the
 225    transfer is not supported or otherwise fails.  Return of a positive
 226    value less than LEN indicates that no further transfer is possible.
 227    Unlike the raw to_xfer_partial interface, callers of these
 228    functions do not need to retry partial transfers.  */
 229
 230 extern LONGEST target_read (struct target_ops *ops,
 231                             enum target_object object,
 232                             const char *annex, gdb_byte *buf,
 233                             ULONGEST offset, LONGEST len);
 234
 235 extern LONGEST target_write (struct target_ops *ops,
 236                              enum target_object object,
 237                              const char *annex, const gdb_byte *buf,
 238                              ULONGEST offset, LONGEST len);
 239
 240 /* Similar to target_write, except that it also calls PROGRESS with
 241    the number of bytes written and the opaque BATON after every
 242    successful partial write (and before the first write).  This is
 243    useful for progress reporting and user interaction while writing
 244    data.  To abort the transfer, the progress callback can throw an
 245    exception.  */
 246
 247 LONGEST target_write_with_progress (struct target_ops *ops,
 248                                     enum target_object object,
 249                                     const char *annex, const gdb_byte *buf,
 250                                     ULONGEST offset, LONGEST len,
 251                                     void (*progress) (ULONGEST, void *),
 252                                     void *baton);
 253
 254 /* Wrapper to perform a full read of unknown size.  OBJECT/ANNEX will
 255    be read using OPS.  The return value will be -1 if the transfer
 256    fails or is not supported; 0 if the object is empty; or the length
 257    of the object otherwise.  If a positive value is returned, a
 258    sufficiently large buffer will be allocated using xmalloc and
 259    returned in *BUF_P containing the contents of the object.
 260
 261    This method should be used for objects sufficiently small to store
 262    in a single xmalloc'd buffer, when no fixed bound on the object's
 263    size is known in advance.  Don't try to read TARGET_OBJECT_MEMORY
 264    through this function.  */
 265
 266 extern LONGEST target_read_alloc (struct target_ops *ops,
 267                                   enum target_object object,
 268                                   const char *annex, gdb_byte **buf_p);
 269
 270 /* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and
 271    returned as a string, allocated using xmalloc.  If an error occurs
 272    or the transfer is unsupported, NULL is returned.  Empty objects
 273    are returned as allocated but empty strings.  A warning is issued
 274    if the result contains any embedded NUL bytes.  */
 275
 276 extern char *target_read_stralloc (struct target_ops *ops,
 277                                    enum target_object object,
 278                                    const char *annex);
 279
 280 /* Wrappers to target read/write that perform memory transfers.  They
 281    throw an error if the memory transfer fails.
 282
 283    NOTE: cagney/2003-10-23: The naming schema is lifted from
 284    "frame.h".  The parameter order is lifted from get_frame_memory,
 285    which in turn lifted it from read_memory.  */
 286
 287 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 288                                gdb_byte *buf, LONGEST len);
 289 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 290                                             CORE_ADDR addr, int len);
 291 \f
 292
 293 /* If certain kinds of activity happen, target_wait should perform
 294    callbacks.  */
 295 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 296    on TARGET_ACTIVITY_FD.  */
 297 extern int target_activity_fd;
 298 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 299 extern int (*target_activity_function) (void);
 300 \f
 301 struct thread_info;             /* fwd decl for parameter list below: */
 302
 303 struct target_ops
 304   {
 305     struct target_ops *beneath; /* To the target under this one.  */
 306     char *to_shortname;         /* Name this target type */
 307     char *to_longname;          /* Name for printing */
 308     char *to_doc;               /* Documentation.  Does not include trailing
 309                                    newline, and starts with a one-line descrip-
 310                                    tion (probably similar to to_longname).  */
 311     /* Per-target scratch pad.  */
 312     void *to_data;
 313     /* The open routine takes the rest of the parameters from the
 314        command, and (if successful) pushes a new target onto the
 315        stack.  Targets should supply this routine, if only to provide
 316        an error message.  */
 317     void (*to_open) (char *, int);
 318     /* Old targets with a static target vector provide "to_close".
 319        New re-entrant targets provide "to_xclose" and that is expected
 320        to xfree everything (including the "struct target_ops").  */
 321     void (*to_xclose) (struct target_ops *targ, int quitting);
 322     void (*to_close) (int);
 323     void (*to_attach) (char *, int);
 324     void (*to_post_attach) (int);
 325     void (*to_detach) (char *, int);
 326     void (*to_disconnect) (struct target_ops *, char *, int);
 327     void (*to_resume) (ptid_t, int, enum target_signal);
 328     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 329     void (*to_fetch_registers) (struct regcache *, int);
 330     void (*to_store_registers) (struct regcache *, int);
 331     void (*to_prepare_to_store) (struct regcache *);
 332
 333     /* Transfer LEN bytes of memory between GDB address MYADDR and
 334        target address MEMADDR.  If WRITE, transfer them to the target, else
 335        transfer them from the target.  TARGET is the target from which we
 336        get this function.
 337
 338        Return value, N, is one of the following:
 339
 340        0 means that we can't handle this.  If errno has been set, it is the
 341        error which prevented us from doing it (FIXME: What about bfd_error?).
 342
 343        positive (call it N) means that we have transferred N bytes
 344        starting at MEMADDR.  We might be able to handle more bytes
 345        beyond this length, but no promises.
 346
 347        negative (call its absolute value N) means that we cannot
 348        transfer right at MEMADDR, but we could transfer at least
 349        something at MEMADDR + N.
 350
 351        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 352        to_xfer_partial and inferior inheritance.  */
 353
 354     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 355                                    int len, int write,
 356                                    struct mem_attrib *attrib,
 357                                    struct target_ops *target);
 358
 359     void (*to_files_info) (struct target_ops *);
 360     int (*to_insert_breakpoint) (struct bp_target_info *);
 361     int (*to_remove_breakpoint) (struct bp_target_info *);
 362     int (*to_can_use_hw_breakpoint) (int, int, int);
 363     int (*to_insert_hw_breakpoint) (struct bp_target_info *);
 364     int (*to_remove_hw_breakpoint) (struct bp_target_info *);
 365     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 366     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 367     int (*to_stopped_by_watchpoint) (void);
 368     int to_have_steppable_watchpoint;
 369     int to_have_continuable_watchpoint;
 370     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 371     int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);
 372     void (*to_terminal_init) (void);
 373     void (*to_terminal_inferior) (void);
 374     void (*to_terminal_ours_for_output) (void);
 375     void (*to_terminal_ours) (void);
 376     void (*to_terminal_save_ours) (void);
 377     void (*to_terminal_info) (char *, int);
 378     void (*to_kill) (void);
 379     void (*to_load) (char *, int);
 380     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 381     void (*to_create_inferior) (char *, char *, char **, int);
 382     void (*to_post_startup_inferior) (ptid_t);
 383     void (*to_acknowledge_created_inferior) (int);
 384     void (*to_insert_fork_catchpoint) (int);
 385     int (*to_remove_fork_catchpoint) (int);
 386     void (*to_insert_vfork_catchpoint) (int);
 387     int (*to_remove_vfork_catchpoint) (int);
 388     int (*to_follow_fork) (struct target_ops *, int);
 389     void (*to_insert_exec_catchpoint) (int);
 390     int (*to_remove_exec_catchpoint) (int);
 391     int (*to_reported_exec_events_per_exec_call) (void);
 392     int (*to_has_exited) (int, int, int *);
 393     void (*to_mourn_inferior) (void);
 394     int (*to_can_run) (void);
 395     void (*to_notice_signals) (ptid_t ptid);
 396     int (*to_thread_alive) (ptid_t ptid);
 397     void (*to_find_new_threads) (void);
 398     char *(*to_pid_to_str) (ptid_t);
 399     char *(*to_extra_thread_info) (struct thread_info *);
 400     void (*to_stop) (void);
 401     void (*to_rcmd) (char *command, struct ui_file *output);
 402     struct symtab_and_line *(*to_enable_exception_callback) (enum
 403                                                              exception_event_kind,
 404                                                              int);
 405     struct exception_event_record *(*to_get_current_exception_event) (void);
 406     char *(*to_pid_to_exec_file) (int pid);
 407     enum strata to_stratum;
 408     int to_has_all_memory;
 409     int to_has_memory;
 410     int to_has_stack;
 411     int to_has_registers;
 412     int to_has_execution;
 413     int to_has_thread_control;  /* control thread execution */
 414     struct section_table
 415      *to_sections;
 416     struct section_table
 417      *to_sections_end;
 418     /* ASYNC target controls */
 419     int (*to_can_async_p) (void);
 420     int (*to_is_async_p) (void);
 421     void (*to_async) (void (*cb) (enum inferior_event_type, void *context),
 422                       void *context);
 423     int to_async_mask_value;
 424     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 425                                             unsigned long,
 426                                             int, int, int,
 427                                             void *),
 428                                    void *);
 429     char * (*to_make_corefile_notes) (bfd *, int *);
 430
 431     /* Return the thread-local address at OFFSET in the
 432        thread-local storage for the thread PTID and the shared library
 433        or executable file given by OBJFILE.  If that block of
 434        thread-local storage hasn't been allocated yet, this function
 435        may return an error.  */
 436     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 437                                               CORE_ADDR load_module_addr,
 438                                               CORE_ADDR offset);
 439
 440     /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 441        OBJECT.  The OFFSET, for a seekable object, specifies the
 442        starting point.  The ANNEX can be used to provide additional
 443        data-specific information to the target.
 444
 445        Return the number of bytes actually transfered, zero when no
 446        further transfer is possible, and -1 when the transfer is not
 447        supported.  Return of a positive value smaller than LEN does
 448        not indicate the end of the object, only the end of the
 449        transfer; higher level code should continue transferring if
 450        desired.  This is handled in target.c.
 451
 452        The interface does not support a "retry" mechanism.  Instead it
 453        assumes that at least one byte will be transfered on each
 454        successful call.
 455
 456        NOTE: cagney/2003-10-17: The current interface can lead to
 457        fragmented transfers.  Lower target levels should not implement
 458        hacks, such as enlarging the transfer, in an attempt to
 459        compensate for this.  Instead, the target stack should be
 460        extended so that it implements supply/collect methods and a
 461        look-aside object cache.  With that available, the lowest
 462        target can safely and freely "push" data up the stack.
 463
 464        See target_read and target_write for more information.  One,
 465        and only one, of readbuf or writebuf must be non-NULL.  */
 466
 467     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 468                                 enum target_object object, const char *annex,
 469                                 gdb_byte *readbuf, const gdb_byte *writebuf,
 470                                 ULONGEST offset, LONGEST len);
 471
 472     /* Returns the memory map for the target.  A return value of NULL
 473        means that no memory map is available.  If a memory address
 474        does not fall within any returned regions, it's assumed to be
 475        RAM.  The returned memory regions should not overlap.
 476
 477        The order of regions does not matter; target_memory_map will
 478        sort regions by starting address. For that reason, this
 479        function should not be called directly except via
 480        target_memory_map.
 481
 482        This method should not cache data; if the memory map could
 483        change unexpectedly, it should be invalidated, and higher
 484        layers will re-fetch it.  */
 485     VEC(mem_region_s) *(*to_memory_map) (struct target_ops *);
 486
 487     /* Erases the region of flash memory starting at ADDRESS, of
 488        length LENGTH.
 489
 490        Precondition: both ADDRESS and ADDRESS+LENGTH should be aligned
 491        on flash block boundaries, as reported by 'to_memory_map'.  */
 492     void (*to_flash_erase) (struct target_ops *,
 493                            ULONGEST address, LONGEST length);
 494
 495     /* Finishes a flash memory write sequence.  After this operation
 496        all flash memory should be available for writing and the result
 497        of reading from areas written by 'to_flash_write' should be
 498        equal to what was written.  */
 499     void (*to_flash_done) (struct target_ops *);
 500
 501     /* Describe the architecture-specific features of this target.
 502        Returns the description found, or NULL if no description
 503        was available.  */
 504     const struct target_desc *(*to_read_description) (struct target_ops *ops);
 505
 506     int to_magic;
 507     /* Need sub-structure for target machine related rather than comm related?
 508      */
 509   };
 510
 511 /* Magic number for checking ops size.  If a struct doesn't end with this
 512    number, somebody changed the declaration but didn't change all the
 513    places that initialize one.  */
 514
 515 #define OPS_MAGIC       3840
 516
 517 /* The ops structure for our "current" target process.  This should
 518    never be NULL.  If there is no target, it points to the dummy_target.  */
 519
 520 extern struct target_ops current_target;
 521
 522 /* Define easy words for doing these operations on our current target.  */
 523
 524 #define target_shortname        (current_target.to_shortname)
 525 #define target_longname         (current_target.to_longname)
 526
 527 /* Does whatever cleanup is required for a target that we are no
 528    longer going to be calling.  QUITTING indicates that GDB is exiting
 529    and should not get hung on an error (otherwise it is important to
 530    perform clean termination, even if it takes a while).  This routine
 531    is automatically always called when popping the target off the
 532    target stack (to_beneath is undefined).  Closing file descriptors
 533    and freeing all memory allocated memory are typical things it
 534    should do.  */
 535
 536 void target_close (struct target_ops *targ, int quitting);
 537
 538 /* Attaches to a process on the target side.  Arguments are as passed
 539    to the `attach' command by the user.  This routine can be called
 540    when the target is not on the target-stack, if the target_can_run
 541    routine returns 1; in that case, it must push itself onto the stack.
 542    Upon exit, the target should be ready for normal operations, and
 543    should be ready to deliver the status of the process immediately
 544    (without waiting) to an upcoming target_wait call.  */
 545
 546 #define target_attach(args, from_tty)   \
 547      (*current_target.to_attach) (args, from_tty)
 548
 549 /* The target_attach operation places a process under debugger control,
 550    and stops the process.
 551
 552    This operation provides a target-specific hook that allows the
 553    necessary bookkeeping to be performed after an attach completes.  */
 554 #define target_post_attach(pid) \
 555      (*current_target.to_post_attach) (pid)
 556
 557 /* Takes a program previously attached to and detaches it.
 558    The program may resume execution (some targets do, some don't) and will
 559    no longer stop on signals, etc.  We better not have left any breakpoints
 560    in the program or it'll die when it hits one.  ARGS is arguments
 561    typed by the user (e.g. a signal to send the process).  FROM_TTY
 562    says whether to be verbose or not.  */
 563
 564 extern void target_detach (char *, int);
 565
 566 /* Disconnect from the current target without resuming it (leaving it
 567    waiting for a debugger).  */
 568
 569 extern void target_disconnect (char *, int);
 570
 571 /* Resume execution of the target process PTID.  STEP says whether to
 572    single-step or to run free; SIGGNAL is the signal to be given to
 573    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 574    pass TARGET_SIGNAL_DEFAULT.  */
 575
 576 #define target_resume(ptid, step, siggnal)                              \
 577   do {                                                                  \
 578     dcache_invalidate(target_dcache);                                   \
 579     (*current_target.to_resume) (ptid, step, siggnal);                  \
 580   } while (0)
 581
 582 /* Wait for process pid to do something.  PTID = -1 to wait for any
 583    pid to do something.  Return pid of child, or -1 in case of error;
 584    store status through argument pointer STATUS.  Note that it is
 585    _NOT_ OK to throw_exception() out of target_wait() without popping
 586    the debugging target from the stack; GDB isn't prepared to get back
 587    to the prompt with a debugging target but without the frame cache,
 588    stop_pc, etc., set up.  */
 589
 590 #define target_wait(ptid, status)               \
 591      (*current_target.to_wait) (ptid, status)
 592
 593 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 594
 595 #define target_fetch_registers(regcache, regno) \
 596      (*current_target.to_fetch_registers) (regcache, regno)
 597
 598 /* Store at least register REGNO, or all regs if REGNO == -1.
 599    It can store as many registers as it wants to, so target_prepare_to_store
 600    must have been previously called.  Calls error() if there are problems.  */
 601
 602 #define target_store_registers(regcache, regs)  \
 603      (*current_target.to_store_registers) (regcache, regs)
 604
 605 /* Get ready to modify the registers array.  On machines which store
 606    individual registers, this doesn't need to do anything.  On machines
 607    which store all the registers in one fell swoop, this makes sure
 608    that REGISTERS contains all the registers from the program being
 609    debugged.  */
 610
 611 #define target_prepare_to_store(regcache)       \
 612      (*current_target.to_prepare_to_store) (regcache)
 613
 614 extern DCACHE *target_dcache;
 615
 616 extern int target_read_string (CORE_ADDR, char **, int, int *);
 617
 618 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 619
 620 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 621                                 int len);
 622
 623 extern int xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 624                         struct mem_attrib *, struct target_ops *);
 625
 626 /* Fetches the target's memory map.  If one is found it is sorted
 627    and returned, after some consistency checking.  Otherwise, NULL
 628    is returned.  */
 629 VEC(mem_region_s) *target_memory_map (void);
 630
 631 /* Erase the specified flash region.  */
 632 void target_flash_erase (ULONGEST address, LONGEST length);
 633
 634 /* Finish a sequence of flash operations.  */
 635 void target_flash_done (void);
 636
 637 /* Describes a request for a memory write operation.  */
 638 struct memory_write_request
 639   {
 640     /* Begining address that must be written. */
 641     ULONGEST begin;
 642     /* Past-the-end address. */
 643     ULONGEST end;
 644     /* The data to write. */
 645     gdb_byte *data;
 646     /* A callback baton for progress reporting for this request.  */
 647     void *baton;
 648   };
 649 typedef struct memory_write_request memory_write_request_s;
 650 DEF_VEC_O(memory_write_request_s);
 651
 652 /* Enumeration specifying different flash preservation behaviour.  */
 653 enum flash_preserve_mode
 654   {
 655     flash_preserve,
 656     flash_discard
 657   };
 658
 659 /* Write several memory blocks at once.  This version can be more
 660    efficient than making several calls to target_write_memory, in
 661    particular because it can optimize accesses to flash memory.
 662
 663    Moreover, this is currently the only memory access function in gdb
 664    that supports writing to flash memory, and it should be used for
 665    all cases where access to flash memory is desirable.
 666
 667    REQUESTS is the vector (see vec.h) of memory_write_request.
 668    PRESERVE_FLASH_P indicates what to do with blocks which must be
 669      erased, but not completely rewritten.
 670    PROGRESS_CB is a function that will be periodically called to provide
 671      feedback to user.  It will be called with the baton corresponding
 672      to the request currently being written.  It may also be called
 673      with a NULL baton, when preserved flash sectors are being rewritten.
 674
 675    The function returns 0 on success, and error otherwise.  */
 676 int target_write_memory_blocks (VEC(memory_write_request_s) *requests,
 677                                 enum flash_preserve_mode preserve_flash_p,
 678                                 void (*progress_cb) (ULONGEST, void *));
 679
 680 /* From infrun.c.  */
 681
 682 extern int inferior_has_forked (int pid, int *child_pid);
 683
 684 extern int inferior_has_vforked (int pid, int *child_pid);
 685
 686 extern int inferior_has_execd (int pid, char **execd_pathname);
 687
 688 /* From exec.c */
 689
 690 extern void print_section_info (struct target_ops *, bfd *);
 691
 692 /* Print a line about the current target.  */
 693
 694 #define target_files_info()     \
 695      (*current_target.to_files_info) (&current_target)
 696
 697 /* Insert a breakpoint at address BP_TGT->placed_address in the target
 698    machine.  Result is 0 for success, or an errno value.  */
 699
 700 #define target_insert_breakpoint(bp_tgt)        \
 701      (*current_target.to_insert_breakpoint) (bp_tgt)
 702
 703 /* Remove a breakpoint at address BP_TGT->placed_address in the target
 704    machine.  Result is 0 for success, or an errno value.  */
 705
 706 #define target_remove_breakpoint(bp_tgt)        \
 707      (*current_target.to_remove_breakpoint) (bp_tgt)
 708
 709 /* Initialize the terminal settings we record for the inferior,
 710    before we actually run the inferior.  */
 711
 712 #define target_terminal_init() \
 713      (*current_target.to_terminal_init) ()
 714
 715 /* Put the inferior's terminal settings into effect.
 716    This is preparation for starting or resuming the inferior.  */
 717
 718 #define target_terminal_inferior() \
 719      (*current_target.to_terminal_inferior) ()
 720
 721 /* Put some of our terminal settings into effect,
 722    enough to get proper results from our output,
 723    but do not change into or out of RAW mode
 724    so that no input is discarded.
 725
 726    After doing this, either terminal_ours or terminal_inferior
 727    should be called to get back to a normal state of affairs.  */
 728
 729 #define target_terminal_ours_for_output() \
 730      (*current_target.to_terminal_ours_for_output) ()
 731
 732 /* Put our terminal settings into effect.
 733    First record the inferior's terminal settings
 734    so they can be restored properly later.  */
 735
 736 #define target_terminal_ours() \
 737      (*current_target.to_terminal_ours) ()
 738
 739 /* Save our terminal settings.
 740    This is called from TUI after entering or leaving the curses
 741    mode.  Since curses modifies our terminal this call is here
 742    to take this change into account.  */
 743
 744 #define target_terminal_save_ours() \
 745      (*current_target.to_terminal_save_ours) ()
 746
 747 /* Print useful information about our terminal status, if such a thing
 748    exists.  */
 749
 750 #define target_terminal_info(arg, from_tty) \
 751      (*current_target.to_terminal_info) (arg, from_tty)
 752
 753 /* Kill the inferior process.   Make it go away.  */
 754
 755 #define target_kill() \
 756      (*current_target.to_kill) ()
 757
 758 /* Load an executable file into the target process.  This is expected
 759    to not only bring new code into the target process, but also to
 760    update GDB's symbol tables to match.
 761
 762    ARG contains command-line arguments, to be broken down with
 763    buildargv ().  The first non-switch argument is the filename to
 764    load, FILE; the second is a number (as parsed by strtoul (..., ...,
 765    0)), which is an offset to apply to the load addresses of FILE's
 766    sections.  The target may define switches, or other non-switch
 767    arguments, as it pleases.  */
 768
 769 extern void target_load (char *arg, int from_tty);
 770
 771 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 772    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 773    symbol should be returned.  The result is 0 if successful, nonzero
 774    if the symbol does not exist in the target environment.  This
 775    function should not call error() if communication with the target
 776    is interrupted, since it is called from symbol reading, but should
 777    return nonzero, possibly doing a complain().  */
 778
 779 #define target_lookup_symbol(name, addrp) \
 780      (*current_target.to_lookup_symbol) (name, addrp)
 781
 782 /* Start an inferior process and set inferior_ptid to its pid.
 783    EXEC_FILE is the file to run.
 784    ALLARGS is a string containing the arguments to the program.
 785    ENV is the environment vector to pass.  Errors reported with error().
 786    On VxWorks and various standalone systems, we ignore exec_file.  */
 787
 788 #define target_create_inferior(exec_file, args, env, FROM_TTY)  \
 789      (*current_target.to_create_inferior) (exec_file, args, env, (FROM_TTY))
 790
 791
 792 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 793    notification of inferior events such as fork and vork immediately
 794    after the inferior is created.  (This because of how gdb gets an
 795    inferior created via invoking a shell to do it.  In such a scenario,
 796    if the shell init file has commands in it, the shell will fork and
 797    exec for each of those commands, and we will see each such fork
 798    event.  Very bad.)
 799
 800    Such targets will supply an appropriate definition for this function.  */
 801
 802 #define target_post_startup_inferior(ptid) \
 803      (*current_target.to_post_startup_inferior) (ptid)
 804
 805 /* On some targets, the sequence of starting up an inferior requires
 806    some synchronization between gdb and the new inferior process, PID.  */
 807
 808 #define target_acknowledge_created_inferior(pid) \
 809      (*current_target.to_acknowledge_created_inferior) (pid)
 810
 811 /* On some targets, we can catch an inferior fork or vfork event when
 812    it occurs.  These functions insert/remove an already-created
 813    catchpoint for such events.  */
 814
 815 #define target_insert_fork_catchpoint(pid) \
 816      (*current_target.to_insert_fork_catchpoint) (pid)
 817
 818 #define target_remove_fork_catchpoint(pid) \
 819      (*current_target.to_remove_fork_catchpoint) (pid)
 820
 821 #define target_insert_vfork_catchpoint(pid) \
 822      (*current_target.to_insert_vfork_catchpoint) (pid)
 823
 824 #define target_remove_vfork_catchpoint(pid) \
 825      (*current_target.to_remove_vfork_catchpoint) (pid)
 826
 827 /* If the inferior forks or vforks, this function will be called at
 828    the next resume in order to perform any bookkeeping and fiddling
 829    necessary to continue debugging either the parent or child, as
 830    requested, and releasing the other.  Information about the fork
 831    or vfork event is available via get_last_target_status ().
 832    This function returns 1 if the inferior should not be resumed
 833    (i.e. there is another event pending).  */
 834
 835 int target_follow_fork (int follow_child);
 836
 837 /* On some targets, we can catch an inferior exec event when it
 838    occurs.  These functions insert/remove an already-created
 839    catchpoint for such events.  */
 840
 841 #define target_insert_exec_catchpoint(pid) \
 842      (*current_target.to_insert_exec_catchpoint) (pid)
 843
 844 #define target_remove_exec_catchpoint(pid) \
 845      (*current_target.to_remove_exec_catchpoint) (pid)
 846
 847 /* Returns the number of exec events that are reported when a process
 848    invokes a flavor of the exec() system call on this target, if exec
 849    events are being reported.  */
 850
 851 #define target_reported_exec_events_per_exec_call() \
 852      (*current_target.to_reported_exec_events_per_exec_call) ()
 853
 854 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 855    exit code of PID, if any.  */
 856
 857 #define target_has_exited(pid,wait_status,exit_status) \
 858      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 859
 860 /* The debugger has completed a blocking wait() call.  There is now
 861    some process event that must be processed.  This function should
 862    be defined by those targets that require the debugger to perform
 863    cleanup or internal state changes in response to the process event.  */
 864
 865 /* The inferior process has died.  Do what is right.  */
 866
 867 #define target_mourn_inferior() \
 868      (*current_target.to_mourn_inferior) ()
 869
 870 /* Does target have enough data to do a run or attach command? */
 871
 872 #define target_can_run(t) \
 873      ((t)->to_can_run) ()
 874
 875 /* post process changes to signal handling in the inferior.  */
 876
 877 #define target_notice_signals(ptid) \
 878      (*current_target.to_notice_signals) (ptid)
 879
 880 /* Check to see if a thread is still alive.  */
 881
 882 #define target_thread_alive(ptid) \
 883      (*current_target.to_thread_alive) (ptid)
 884
 885 /* Query for new threads and add them to the thread list.  */
 886
 887 #define target_find_new_threads() \
 888      (*current_target.to_find_new_threads) (); \
 889
 890 /* Make target stop in a continuable fashion.  (For instance, under
 891    Unix, this should act like SIGSTOP).  This function is normally
 892    used by GUIs to implement a stop button.  */
 893
 894 #define target_stop current_target.to_stop
 895
 896 /* Send the specified COMMAND to the target's monitor
 897    (shell,interpreter) for execution.  The result of the query is
 898    placed in OUTBUF.  */
 899
 900 #define target_rcmd(command, outbuf) \
 901      (*current_target.to_rcmd) (command, outbuf)
 902
 903
 904 /* Get the symbol information for a breakpointable routine called when
 905    an exception event occurs.
 906    Intended mainly for C++, and for those
 907    platforms/implementations where such a callback mechanism is available,
 908    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 909    different mechanisms for debugging exceptions.  */
 910
 911 #define target_enable_exception_callback(kind, enable) \
 912      (*current_target.to_enable_exception_callback) (kind, enable)
 913
 914 /* Get the current exception event kind -- throw or catch, etc.  */
 915
 916 #define target_get_current_exception_event() \
 917      (*current_target.to_get_current_exception_event) ()
 918
 919 /* Does the target include all of memory, or only part of it?  This
 920    determines whether we look up the target chain for other parts of
 921    memory if this target can't satisfy a request.  */
 922
 923 #define target_has_all_memory   \
 924      (current_target.to_has_all_memory)
 925
 926 /* Does the target include memory?  (Dummy targets don't.)  */
 927
 928 #define target_has_memory       \
 929      (current_target.to_has_memory)
 930
 931 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 932    we start a process.)  */
 933
 934 #define target_has_stack        \
 935      (current_target.to_has_stack)
 936
 937 /* Does the target have registers?  (Exec files don't.)  */
 938
 939 #define target_has_registers    \
 940      (current_target.to_has_registers)
 941
 942 /* Does the target have execution?  Can we make it jump (through
 943    hoops), or pop its stack a few times?  This means that the current
 944    target is currently executing; for some targets, that's the same as
 945    whether or not the target is capable of execution, but there are
 946    also targets which can be current while not executing.  In that
 947    case this will become true after target_create_inferior or
 948    target_attach.  */
 949
 950 #define target_has_execution    \
 951      (current_target.to_has_execution)
 952
 953 /* Can the target support the debugger control of thread execution?
 954    a) Can it lock the thread scheduler?
 955    b) Can it switch the currently running thread?  */
 956
 957 #define target_can_lock_scheduler \
 958      (current_target.to_has_thread_control & tc_schedlock)
 959
 960 #define target_can_switch_threads \
 961      (current_target.to_has_thread_control & tc_switch)
 962
 963 /* Can the target support asynchronous execution? */
 964 #define target_can_async_p() (current_target.to_can_async_p ())
 965
 966 /* Is the target in asynchronous execution mode? */
 967 #define target_is_async_p() (current_target.to_is_async_p())
 968
 969 /* Put the target in async mode with the specified callback function. */
 970 #define target_async(CALLBACK,CONTEXT) \
 971      (current_target.to_async((CALLBACK), (CONTEXT)))
 972
 973 /* This is to be used ONLY within call_function_by_hand(). It provides
 974    a workaround, to have inferior function calls done in sychronous
 975    mode, even though the target is asynchronous. After
 976    target_async_mask(0) is called, calls to target_can_async_p() will
 977    return FALSE , so that target_resume() will not try to start the
 978    target asynchronously. After the inferior stops, we IMMEDIATELY
 979    restore the previous nature of the target, by calling
 980    target_async_mask(1). After that, target_can_async_p() will return
 981    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 982
 983    FIXME ezannoni 1999-12-13: we won't need this once we move
 984    the turning async on and off to the single execution commands,
 985    from where it is done currently, in remote_resume().  */
 986
 987 #define target_async_mask_value \
 988      (current_target.to_async_mask_value)
 989
 990 extern int target_async_mask (int mask);
 991
 992 /* Converts a process id to a string.  Usually, the string just contains
 993    `process xyz', but on some systems it may contain
 994    `process xyz thread abc'.  */
 995
 996 #undef target_pid_to_str
 997 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
 998
 999 #ifndef target_tid_to_str
1000 #define target_tid_to_str(PID) \
1001      target_pid_to_str (PID)
1002 extern char *normal_pid_to_str (ptid_t ptid);
1003 #endif
1004
1005 /* Return a short string describing extra information about PID,
1006    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
1007    is okay.  */
1008
1009 #define target_extra_thread_info(TP) \
1010      (current_target.to_extra_thread_info (TP))
1011
1012 #ifndef target_pid_or_tid_to_str
1013 #define target_pid_or_tid_to_str(ID) \
1014      target_pid_to_str (ID)
1015 #endif
1016
1017 /* Attempts to find the pathname of the executable file
1018    that was run to create a specified process.
1019
1020    The process PID must be stopped when this operation is used.
1021
1022    If the executable file cannot be determined, NULL is returned.
1023
1024    Else, a pointer to a character string containing the pathname
1025    is returned.  This string should be copied into a buffer by
1026    the client if the string will not be immediately used, or if
1027    it must persist.  */
1028
1029 #define target_pid_to_exec_file(pid) \
1030      (current_target.to_pid_to_exec_file) (pid)
1031
1032 /*
1033  * Iterator function for target memory regions.
1034  * Calls a callback function once for each memory region 'mapped'
1035  * in the child process.  Defined as a simple macro rather than
1036  * as a function macro so that it can be tested for nullity.
1037  */
1038
1039 #define target_find_memory_regions(FUNC, DATA) \
1040      (current_target.to_find_memory_regions) (FUNC, DATA)
1041
1042 /*
1043  * Compose corefile .note section.
1044  */
1045
1046 #define target_make_corefile_notes(BFD, SIZE_P) \
1047      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1048
1049 /* Thread-local values.  */
1050 #define target_get_thread_local_address \
1051     (current_target.to_get_thread_local_address)
1052 #define target_get_thread_local_address_p() \
1053     (target_get_thread_local_address != NULL)
1054
1055
1056 /* Hardware watchpoint interfaces.  */
1057
1058 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1059    write).  */
1060
1061 #ifndef STOPPED_BY_WATCHPOINT
1062 #define STOPPED_BY_WATCHPOINT(w) \
1063    (*current_target.to_stopped_by_watchpoint) ()
1064 #endif
1065
1066 /* Non-zero if we have steppable watchpoints  */
1067
1068 #ifndef HAVE_STEPPABLE_WATCHPOINT
1069 #define HAVE_STEPPABLE_WATCHPOINT \
1070    (current_target.to_have_steppable_watchpoint)
1071 #endif
1072
1073 /* Non-zero if we have continuable watchpoints  */
1074
1075 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1076 #define HAVE_CONTINUABLE_WATCHPOINT \
1077    (current_target.to_have_continuable_watchpoint)
1078 #endif
1079
1080 /* Provide defaults for hardware watchpoint functions.  */
1081
1082 /* If the *_hw_beakpoint functions have not been defined
1083    elsewhere use the definitions in the target vector.  */
1084
1085 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1086    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1087    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1088    (including this one?).  OTHERTYPE is who knows what...  */
1089
1090 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1091 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1092  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1093 #endif
1094
1095 #ifndef TARGET_REGION_OK_FOR_HW_WATCHPOINT
1096 #define TARGET_REGION_OK_FOR_HW_WATCHPOINT(addr, len) \
1097     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1098 #endif
1099
1100
1101 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1102    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1103    success, non-zero for failure.  */
1104
1105 #ifndef target_insert_watchpoint
1106 #define target_insert_watchpoint(addr, len, type)       \
1107      (*current_target.to_insert_watchpoint) (addr, len, type)
1108
1109 #define target_remove_watchpoint(addr, len, type)       \
1110      (*current_target.to_remove_watchpoint) (addr, len, type)
1111 #endif
1112
1113 #ifndef target_insert_hw_breakpoint
1114 #define target_insert_hw_breakpoint(bp_tgt) \
1115      (*current_target.to_insert_hw_breakpoint) (bp_tgt)
1116
1117 #define target_remove_hw_breakpoint(bp_tgt) \
1118      (*current_target.to_remove_hw_breakpoint) (bp_tgt)
1119 #endif
1120
1121 extern int target_stopped_data_address_p (struct target_ops *);
1122
1123 #ifndef target_stopped_data_address
1124 #define target_stopped_data_address(target, x) \
1125     (*target.to_stopped_data_address) (target, x)
1126 #else
1127 /* Horrible hack to get around existing macros :-(.  */
1128 #define target_stopped_data_address_p(CURRENT_TARGET) (1)
1129 #endif
1130
1131 extern const struct target_desc *target_read_description (struct target_ops *);
1132
1133 /* Routines for maintenance of the target structures...
1134
1135    add_target:   Add a target to the list of all possible targets.
1136
1137    push_target:  Make this target the top of the stack of currently used
1138    targets, within its particular stratum of the stack.  Result
1139    is 0 if now atop the stack, nonzero if not on top (maybe
1140    should warn user).
1141
1142    unpush_target: Remove this from the stack of currently used targets,
1143    no matter where it is on the list.  Returns 0 if no
1144    change, 1 if removed from stack.
1145
1146    pop_target:   Remove the top thing on the stack of current targets.  */
1147
1148 extern void add_target (struct target_ops *);
1149
1150 extern int push_target (struct target_ops *);
1151
1152 extern int unpush_target (struct target_ops *);
1153
1154 extern void target_pre_inferior (int);
1155
1156 extern void target_preopen (int);
1157
1158 extern void pop_target (void);
1159
1160 extern CORE_ADDR target_translate_tls_address (struct objfile *objfile,
1161                                                CORE_ADDR offset);
1162
1163 /* Mark a pushed target as running or exited, for targets which do not
1164    automatically pop when not active.  */
1165
1166 void target_mark_running (struct target_ops *);
1167
1168 void target_mark_exited (struct target_ops *);
1169
1170 /* Struct section_table maps address ranges to file sections.  It is
1171    mostly used with BFD files, but can be used without (e.g. for handling
1172    raw disks, or files not in formats handled by BFD).  */
1173
1174 struct section_table
1175   {
1176     CORE_ADDR addr;             /* Lowest address in section */
1177     CORE_ADDR endaddr;          /* 1+highest address in section */
1178
1179     struct bfd_section *the_bfd_section;
1180
1181     bfd *bfd;                   /* BFD file pointer */
1182   };
1183
1184 /* Return the "section" containing the specified address.  */
1185 struct section_table *target_section_by_addr (struct target_ops *target,
1186                                               CORE_ADDR addr);
1187
1188
1189 /* From mem-break.c */
1190
1191 extern int memory_remove_breakpoint (struct bp_target_info *);
1192
1193 extern int memory_insert_breakpoint (struct bp_target_info *);
1194
1195 extern int default_memory_remove_breakpoint (struct bp_target_info *);
1196
1197 extern int default_memory_insert_breakpoint (struct bp_target_info *);
1198
1199
1200 /* From target.c */
1201
1202 extern void initialize_targets (void);
1203
1204 extern void noprocess (void);
1205
1206 extern void find_default_attach (char *, int);
1207
1208 extern void find_default_create_inferior (char *, char *, char **, int);
1209
1210 extern struct target_ops *find_run_target (void);
1211
1212 extern struct target_ops *find_core_target (void);
1213
1214 extern struct target_ops *find_target_beneath (struct target_ops *);
1215
1216 extern int target_resize_to_sections (struct target_ops *target,
1217                                       int num_added);
1218
1219 extern void remove_target_sections (bfd *abfd);
1220
1221 \f
1222 /* Stuff that should be shared among the various remote targets.  */
1223
1224 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1225    information (higher values, more information).  */
1226 extern int remote_debug;
1227
1228 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1229 extern int baud_rate;
1230 /* Timeout limit for response from target. */
1231 extern int remote_timeout;
1232
1233 \f
1234 /* Functions for helping to write a native target.  */
1235
1236 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1237 extern void store_waitstatus (struct target_waitstatus *, int);
1238
1239 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1240    targ_signal SIGNO has an equivalent ``host'' representation.  */
1241 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1242    to the shorter target_signal_p() because it is far less ambigious.
1243    In this context ``target_signal'' refers to GDB's internal
1244    representation of the target's set of signals while ``host signal''
1245    refers to the target operating system's signal.  Confused?  */
1246
1247 extern int target_signal_to_host_p (enum target_signal signo);
1248
1249 /* Convert between host signal numbers and enum target_signal's.
1250    target_signal_to_host() returns 0 and prints a warning() on GDB's
1251    console if SIGNO has no equivalent host representation.  */
1252 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1253    refering to the target operating system's signal numbering.
1254    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1255    gdb_signal'' would probably be better as it is refering to GDB's
1256    internal representation of a target operating system's signal.  */
1257
1258 extern enum target_signal target_signal_from_host (int);
1259 extern int target_signal_to_host (enum target_signal);
1260
1261 /* Convert from a number used in a GDB command to an enum target_signal.  */
1262 extern enum target_signal target_signal_from_command (int);
1263
1264 /* Any target can call this to switch to remote protocol (in remote.c). */
1265 extern void push_remote_target (char *name, int from_tty);
1266 \f
1267 /* Imported from machine dependent code */
1268
1269 /* Blank target vector entries are initialized to target_ignore. */
1270 void target_ignore (void);
1271
1272 extern struct target_ops deprecated_child_ops;
1273
1274 #endif /* !defined (TARGET_H) */