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,
   4    1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
   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
  35 /* This include file defines the interface between the main part
  36    of the debugger, and the part which is target-specific, or
  37    specific to the communications interface between us and the
  38    target.
  39
  40    A TARGET is an interface between the debugger and a particular
  41    kind of file or process.  Targets can be STACKED in STRATA,
  42    so that more than one target can potentially respond to a request.
  43    In particular, memory accesses will walk down the stack of targets
  44    until they find a target that is interested in handling that particular
  45    address.  STRATA are artificial boundaries on the stack, within
  46    which particular kinds of targets live.  Strata exist so that
  47    people don't get confused by pushing e.g. a process target and then
  48    a file target, and wondering why they can't see the current values
  49    of variables any more (the file target is handling them and they
  50    never get to the process target).  So when you push a file target,
  51    it goes into the file stratum, which is always below the process
  52    stratum.  */
  53
  54 #include "bfd.h"
  55 #include "symtab.h"
  56 #include "dcache.h"
  57 #include "memattr.h"
  58 #include "vec.h"
  59
  60 enum strata
  61   {
  62     dummy_stratum,              /* The lowest of the low */
  63     file_stratum,               /* Executable files, etc */
  64     core_stratum,               /* Core dump files */
  65     download_stratum,           /* Downloading of remote targets */
  66     process_stratum,            /* Executing processes */
  67     thread_stratum              /* Executing threads */
  68   };
  69
  70 enum thread_control_capabilities
  71   {
  72     tc_none = 0,                /* Default: can't control thread execution.  */
  73     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  74     tc_switch = 2               /* Can switch the running thread on demand.  */
  75   };
  76
  77 /* Stuff for target_wait.  */
  78
  79 /* Generally, what has the program done?  */
  80 enum target_waitkind
  81   {
  82     /* The program has exited.  The exit status is in value.integer.  */
  83     TARGET_WAITKIND_EXITED,
  84
  85     /* The program has stopped with a signal.  Which signal is in
  86        value.sig.  */
  87     TARGET_WAITKIND_STOPPED,
  88
  89     /* The program has terminated with a signal.  Which signal is in
  90        value.sig.  */
  91     TARGET_WAITKIND_SIGNALLED,
  92
  93     /* The program is letting us know that it dynamically loaded something
  94        (e.g. it called load(2) on AIX).  */
  95     TARGET_WAITKIND_LOADED,
  96
  97     /* The program has forked.  A "related" process' ID is in
  98        value.related_pid.  I.e., if the child forks, value.related_pid
  99        is the parent's ID.  */
 100
 101     TARGET_WAITKIND_FORKED,
 102
 103     /* The program has vforked.  A "related" process's ID is in
 104        value.related_pid.  */
 105
 106     TARGET_WAITKIND_VFORKED,
 107
 108     /* The program has exec'ed a new executable file.  The new file's
 109        pathname is pointed to by value.execd_pathname.  */
 110
 111     TARGET_WAITKIND_EXECD,
 112
 113     /* The program has entered or returned from a system call.  On
 114        HP-UX, this is used in the hardware watchpoint implementation.
 115        The syscall's unique integer ID number is in value.syscall_id */
 116
 117     TARGET_WAITKIND_SYSCALL_ENTRY,
 118     TARGET_WAITKIND_SYSCALL_RETURN,
 119
 120     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 121        within target_wait, but I'm not sure target_wait should be resuming the
 122        inferior.  */
 123     TARGET_WAITKIND_SPURIOUS,
 124
 125     /* An event has occured, but we should wait again.
 126        Remote_async_wait() returns this when there is an event
 127        on the inferior, but the rest of the world is not interested in
 128        it. The inferior has not stopped, but has just sent some output
 129        to the console, for instance. In this case, we want to go back
 130        to the event loop and wait there for another event from the
 131        inferior, rather than being stuck in the remote_async_wait()
 132        function. This way the event loop is responsive to other events,
 133        like for instance the user typing.  */
 134     TARGET_WAITKIND_IGNORE
 135   };
 136
 137 struct target_waitstatus
 138   {
 139     enum target_waitkind kind;
 140
 141     /* Forked child pid, execd pathname, exit status or signal number.  */
 142     union
 143       {
 144         int integer;
 145         enum target_signal sig;
 146         int related_pid;
 147         char *execd_pathname;
 148         int syscall_id;
 149       }
 150     value;
 151   };
 152
 153 /* Possible types of events that the inferior handler will have to
 154    deal with.  */
 155 enum inferior_event_type
 156   {
 157     /* There is a request to quit the inferior, abandon it.  */
 158     INF_QUIT_REQ,
 159     /* Process a normal inferior event which will result in target_wait
 160        being called.  */
 161     INF_REG_EVENT,
 162     /* Deal with an error on the inferior.  */
 163     INF_ERROR,
 164     /* We are called because a timer went off.  */
 165     INF_TIMER,
 166     /* We are called to do stuff after the inferior stops.  */
 167     INF_EXEC_COMPLETE,
 168     /* We are called to do some stuff after the inferior stops, but we
 169        are expected to reenter the proceed() and
 170        handle_inferior_event() functions. This is used only in case of
 171        'step n' like commands.  */
 172     INF_EXEC_CONTINUE
 173   };
 174
 175 /* Return the string for a signal.  */
 176 extern char *target_signal_to_string (enum target_signal);
 177
 178 /* Return the name (SIGHUP, etc.) for a signal.  */
 179 extern char *target_signal_to_name (enum target_signal);
 180
 181 /* Given a name (SIGHUP, etc.), return its signal.  */
 182 enum target_signal target_signal_from_name (char *);
 183 \f
 184 /* Target objects which can be transfered using target_read,
 185    target_write, et cetera.  */
 186
 187 enum target_object
 188 {
 189   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 190   TARGET_OBJECT_AVR,
 191   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 192   TARGET_OBJECT_MEMORY,
 193   /* Memory, avoiding GDB's data cache and trusting the executable.
 194      Target implementations of to_xfer_partial never need to handle
 195      this object, and most callers should not use it.  */
 196   TARGET_OBJECT_RAW_MEMORY,
 197   /* Kernel Unwind Table.  See "ia64-tdep.c".  */
 198   TARGET_OBJECT_UNWIND_TABLE,
 199   /* Transfer auxilliary vector.  */
 200   TARGET_OBJECT_AUXV,
 201   /* StackGhost cookie.  See "sparc-tdep.c".  */
 202   TARGET_OBJECT_WCOOKIE,
 203   /* Target memory map in XML format.  */
 204   TARGET_OBJECT_MEMORY_MAP,
 205   /* Flash memory.  This object can be used to write contents to
 206      a previously erased flash memory.  Using it without erasing
 207      flash can have unexpected results.  Addresses are physical
 208      address on target, and not relative to flash start.  */
 209   TARGET_OBJECT_FLASH
 210
 211   /* Possible future objects: TARGET_OBJECT_FILE, TARGET_OBJECT_PROC, ... */
 212 };
 213
 214 /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 215    OBJECT.  The OFFSET, for a seekable object, specifies the
 216    starting point.  The ANNEX can be used to provide additional
 217    data-specific information to the target.
 218
 219    Return the number of bytes actually transfered, or -1 if the
 220    transfer is not supported or otherwise fails.  Return of a positive
 221    value less than LEN indicates that no further transfer is possible.
 222    Unlike the raw to_xfer_partial interface, callers of these
 223    functions do not need to retry partial transfers.  */
 224
 225 extern LONGEST target_read (struct target_ops *ops,
 226                             enum target_object object,
 227                             const char *annex, gdb_byte *buf,
 228                             ULONGEST offset, LONGEST len);
 229
 230 extern LONGEST target_write (struct target_ops *ops,
 231                              enum target_object object,
 232                              const char *annex, const gdb_byte *buf,
 233                              ULONGEST offset, LONGEST len);
 234
 235 /* Similar to target_write, except that it also calls PROGRESS with
 236    the number of bytes written and the opaque BATON after every
 237    successful partial write (and before the first write).  This is
 238    useful for progress reporting and user interaction while writing
 239    data.  To abort the transfer, the progress callback can throw an
 240    exception.  */
 241
 242 LONGEST target_write_with_progress (struct target_ops *ops,
 243                                     enum target_object object,
 244                                     const char *annex, const gdb_byte *buf,
 245                                     ULONGEST offset, LONGEST len,
 246                                     void (*progress) (ULONGEST, void *),
 247                                     void *baton);
 248
 249 /* Wrapper to perform a full read of unknown size.  OBJECT/ANNEX will
 250    be read using OPS.  The return value will be -1 if the transfer
 251    fails or is not supported; 0 if the object is empty; or the length
 252    of the object otherwise.  If a positive value is returned, a
 253    sufficiently large buffer will be allocated using xmalloc and
 254    returned in *BUF_P containing the contents of the object.
 255
 256    This method should be used for objects sufficiently small to store
 257    in a single xmalloc'd buffer, when no fixed bound on the object's
 258    size is known in advance.  Don't try to read TARGET_OBJECT_MEMORY
 259    through this function.  */
 260
 261 extern LONGEST target_read_alloc (struct target_ops *ops,
 262                                   enum target_object object,
 263                                   const char *annex, gdb_byte **buf_p);
 264
 265 /* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and
 266    returned as a string, allocated using xmalloc.  If an error occurs
 267    or the transfer is unsupported, NULL is returned.  Empty objects
 268    are returned as allocated but empty strings.  A warning is issued
 269    if the result contains any embedded NUL bytes.  */
 270
 271 extern char *target_read_stralloc (struct target_ops *ops,
 272                                    enum target_object object,
 273                                    const char *annex);
 274
 275 /* Wrappers to target read/write that perform memory transfers.  They
 276    throw an error if the memory transfer fails.
 277
 278    NOTE: cagney/2003-10-23: The naming schema is lifted from
 279    "frame.h".  The parameter order is lifted from get_frame_memory,
 280    which in turn lifted it from read_memory.  */
 281
 282 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 283                                gdb_byte *buf, LONGEST len);
 284 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 285                                             CORE_ADDR addr, int len);
 286 \f
 287
 288 /* If certain kinds of activity happen, target_wait should perform
 289    callbacks.  */
 290 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 291    on TARGET_ACTIVITY_FD.  */
 292 extern int target_activity_fd;
 293 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 294 extern int (*target_activity_function) (void);
 295 \f
 296 struct thread_info;             /* fwd decl for parameter list below: */
 297
 298 struct target_ops
 299   {
 300     struct target_ops *beneath; /* To the target under this one.  */
 301     char *to_shortname;         /* Name this target type */
 302     char *to_longname;          /* Name for printing */
 303     char *to_doc;               /* Documentation.  Does not include trailing
 304                                    newline, and starts with a one-line descrip-
 305                                    tion (probably similar to to_longname).  */
 306     /* Per-target scratch pad.  */
 307     void *to_data;
 308     /* The open routine takes the rest of the parameters from the
 309        command, and (if successful) pushes a new target onto the
 310        stack.  Targets should supply this routine, if only to provide
 311        an error message.  */
 312     void (*to_open) (char *, int);
 313     /* Old targets with a static target vector provide "to_close".
 314        New re-entrant targets provide "to_xclose" and that is expected
 315        to xfree everything (including the "struct target_ops").  */
 316     void (*to_xclose) (struct target_ops *targ, int quitting);
 317     void (*to_close) (int);
 318     void (*to_attach) (char *, int);
 319     void (*to_post_attach) (int);
 320     void (*to_detach) (char *, int);
 321     void (*to_disconnect) (struct target_ops *, char *, int);
 322     void (*to_resume) (ptid_t, int, enum target_signal);
 323     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 324     void (*to_fetch_registers) (int);
 325     void (*to_store_registers) (int);
 326     void (*to_prepare_to_store) (void);
 327
 328     /* Transfer LEN bytes of memory between GDB address MYADDR and
 329        target address MEMADDR.  If WRITE, transfer them to the target, else
 330        transfer them from the target.  TARGET is the target from which we
 331        get this function.
 332
 333        Return value, N, is one of the following:
 334
 335        0 means that we can't handle this.  If errno has been set, it is the
 336        error which prevented us from doing it (FIXME: What about bfd_error?).
 337
 338        positive (call it N) means that we have transferred N bytes
 339        starting at MEMADDR.  We might be able to handle more bytes
 340        beyond this length, but no promises.
 341
 342        negative (call its absolute value N) means that we cannot
 343        transfer right at MEMADDR, but we could transfer at least
 344        something at MEMADDR + N.
 345
 346        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 347        to_xfer_partial and inferior inheritance.  */
 348
 349     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 350                                    int len, int write,
 351                                    struct mem_attrib *attrib,
 352                                    struct target_ops *target);
 353
 354     void (*to_files_info) (struct target_ops *);
 355     int (*to_insert_breakpoint) (struct bp_target_info *);
 356     int (*to_remove_breakpoint) (struct bp_target_info *);
 357     int (*to_can_use_hw_breakpoint) (int, int, int);
 358     int (*to_insert_hw_breakpoint) (struct bp_target_info *);
 359     int (*to_remove_hw_breakpoint) (struct bp_target_info *);
 360     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 361     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 362     int (*to_stopped_by_watchpoint) (void);
 363     int to_have_continuable_watchpoint;
 364     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 365     int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);
 366     void (*to_terminal_init) (void);
 367     void (*to_terminal_inferior) (void);
 368     void (*to_terminal_ours_for_output) (void);
 369     void (*to_terminal_ours) (void);
 370     void (*to_terminal_save_ours) (void);
 371     void (*to_terminal_info) (char *, int);
 372     void (*to_kill) (void);
 373     void (*to_load) (char *, int);
 374     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 375     void (*to_create_inferior) (char *, char *, char **, int);
 376     void (*to_post_startup_inferior) (ptid_t);
 377     void (*to_acknowledge_created_inferior) (int);
 378     void (*to_insert_fork_catchpoint) (int);
 379     int (*to_remove_fork_catchpoint) (int);
 380     void (*to_insert_vfork_catchpoint) (int);
 381     int (*to_remove_vfork_catchpoint) (int);
 382     int (*to_follow_fork) (struct target_ops *, int);
 383     void (*to_insert_exec_catchpoint) (int);
 384     int (*to_remove_exec_catchpoint) (int);
 385     int (*to_reported_exec_events_per_exec_call) (void);
 386     int (*to_has_exited) (int, int, int *);
 387     void (*to_mourn_inferior) (void);
 388     int (*to_can_run) (void);
 389     void (*to_notice_signals) (ptid_t ptid);
 390     int (*to_thread_alive) (ptid_t ptid);
 391     void (*to_find_new_threads) (void);
 392     char *(*to_pid_to_str) (ptid_t);
 393     char *(*to_extra_thread_info) (struct thread_info *);
 394     void (*to_stop) (void);
 395     void (*to_rcmd) (char *command, struct ui_file *output);
 396     struct symtab_and_line *(*to_enable_exception_callback) (enum
 397                                                              exception_event_kind,
 398                                                              int);
 399     struct exception_event_record *(*to_get_current_exception_event) (void);
 400     char *(*to_pid_to_exec_file) (int pid);
 401     enum strata to_stratum;
 402     int to_has_all_memory;
 403     int to_has_memory;
 404     int to_has_stack;
 405     int to_has_registers;
 406     int to_has_execution;
 407     int to_has_thread_control;  /* control thread execution */
 408     struct section_table
 409      *to_sections;
 410     struct section_table
 411      *to_sections_end;
 412     /* ASYNC target controls */
 413     int (*to_can_async_p) (void);
 414     int (*to_is_async_p) (void);
 415     void (*to_async) (void (*cb) (enum inferior_event_type, void *context),
 416                       void *context);
 417     int to_async_mask_value;
 418     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 419                                             unsigned long,
 420                                             int, int, int,
 421                                             void *),
 422                                    void *);
 423     char * (*to_make_corefile_notes) (bfd *, int *);
 424
 425     /* Return the thread-local address at OFFSET in the
 426        thread-local storage for the thread PTID and the shared library
 427        or executable file given by OBJFILE.  If that block of
 428        thread-local storage hasn't been allocated yet, this function
 429        may return an error.  */
 430     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 431                                               CORE_ADDR load_module_addr,
 432                                               CORE_ADDR offset);
 433
 434     /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 435        OBJECT.  The OFFSET, for a seekable object, specifies the
 436        starting point.  The ANNEX can be used to provide additional
 437        data-specific information to the target.
 438
 439        Return the number of bytes actually transfered, zero when no
 440        further transfer is possible, and -1 when the transfer is not
 441        supported.  Return of a positive value smaller than LEN does
 442        not indicate the end of the object, only the end of the
 443        transfer; higher level code should continue transferring if
 444        desired.  This is handled in target.c.
 445
 446        The interface does not support a "retry" mechanism.  Instead it
 447        assumes that at least one byte will be transfered on each
 448        successful call.
 449
 450        NOTE: cagney/2003-10-17: The current interface can lead to
 451        fragmented transfers.  Lower target levels should not implement
 452        hacks, such as enlarging the transfer, in an attempt to
 453        compensate for this.  Instead, the target stack should be
 454        extended so that it implements supply/collect methods and a
 455        look-aside object cache.  With that available, the lowest
 456        target can safely and freely "push" data up the stack.
 457
 458        See target_read and target_write for more information.  One,
 459        and only one, of readbuf or writebuf must be non-NULL.  */
 460
 461     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 462                                 enum target_object object, const char *annex,
 463                                 gdb_byte *readbuf, const gdb_byte *writebuf,
 464                                 ULONGEST offset, LONGEST len);
 465
 466     /* Returns the memory map for the target.  A return value of NULL
 467        means that no memory map is available.  If a memory address
 468        does not fall within any returned regions, it's assumed to be
 469        RAM.  The returned memory regions should not overlap.
 470
 471        The order of regions does not matter; target_memory_map will
 472        sort regions by starting address. For that reason, this
 473        function should not be called directly except via
 474        target_memory_map.
 475
 476        This method should not cache data; if the memory map could
 477        change unexpectedly, it should be invalidated, and higher
 478        layers will re-fetch it.  */
 479     VEC(mem_region_s) *(*to_memory_map) (struct target_ops *);
 480
 481     /* Erases the region of flash memory starting at ADDRESS, of
 482        length LENGTH.
 483
 484        Precondition: both ADDRESS and ADDRESS+LENGTH should be aligned
 485        on flash block boundaries, as reported by 'to_memory_map'.  */
 486     void (*to_flash_erase) (struct target_ops *,
 487                            ULONGEST address, LONGEST length);
 488
 489     /* Finishes a flash memory write sequence.  After this operation
 490        all flash memory should be available for writing and the result
 491        of reading from areas written by 'to_flash_write' should be
 492        equal to what was written.  */
 493     void (*to_flash_done) (struct target_ops *);
 494
 495     int to_magic;
 496     /* Need sub-structure for target machine related rather than comm related?
 497      */
 498   };
 499
 500 /* Magic number for checking ops size.  If a struct doesn't end with this
 501    number, somebody changed the declaration but didn't change all the
 502    places that initialize one.  */
 503
 504 #define OPS_MAGIC       3840
 505
 506 /* The ops structure for our "current" target process.  This should
 507    never be NULL.  If there is no target, it points to the dummy_target.  */
 508
 509 extern struct target_ops current_target;
 510
 511 /* Define easy words for doing these operations on our current target.  */
 512
 513 #define target_shortname        (current_target.to_shortname)
 514 #define target_longname         (current_target.to_longname)
 515
 516 /* Does whatever cleanup is required for a target that we are no
 517    longer going to be calling.  QUITTING indicates that GDB is exiting
 518    and should not get hung on an error (otherwise it is important to
 519    perform clean termination, even if it takes a while).  This routine
 520    is automatically always called when popping the target off the
 521    target stack (to_beneath is undefined).  Closing file descriptors
 522    and freeing all memory allocated memory are typical things it
 523    should do.  */
 524
 525 void target_close (struct target_ops *targ, int quitting);
 526
 527 /* Attaches to a process on the target side.  Arguments are as passed
 528    to the `attach' command by the user.  This routine can be called
 529    when the target is not on the target-stack, if the target_can_run
 530    routine returns 1; in that case, it must push itself onto the stack.
 531    Upon exit, the target should be ready for normal operations, and
 532    should be ready to deliver the status of the process immediately
 533    (without waiting) to an upcoming target_wait call.  */
 534
 535 #define target_attach(args, from_tty)   \
 536      (*current_target.to_attach) (args, from_tty)
 537
 538 /* The target_attach operation places a process under debugger control,
 539    and stops the process.
 540
 541    This operation provides a target-specific hook that allows the
 542    necessary bookkeeping to be performed after an attach completes.  */
 543 #define target_post_attach(pid) \
 544      (*current_target.to_post_attach) (pid)
 545
 546 /* Takes a program previously attached to and detaches it.
 547    The program may resume execution (some targets do, some don't) and will
 548    no longer stop on signals, etc.  We better not have left any breakpoints
 549    in the program or it'll die when it hits one.  ARGS is arguments
 550    typed by the user (e.g. a signal to send the process).  FROM_TTY
 551    says whether to be verbose or not.  */
 552
 553 extern void target_detach (char *, int);
 554
 555 /* Disconnect from the current target without resuming it (leaving it
 556    waiting for a debugger).  */
 557
 558 extern void target_disconnect (char *, int);
 559
 560 /* Resume execution of the target process PTID.  STEP says whether to
 561    single-step or to run free; SIGGNAL is the signal to be given to
 562    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 563    pass TARGET_SIGNAL_DEFAULT.  */
 564
 565 #define target_resume(ptid, step, siggnal)                              \
 566   do {                                                                  \
 567     dcache_invalidate(target_dcache);                                   \
 568     (*current_target.to_resume) (ptid, step, siggnal);                  \
 569   } while (0)
 570
 571 /* Wait for process pid to do something.  PTID = -1 to wait for any
 572    pid to do something.  Return pid of child, or -1 in case of error;
 573    store status through argument pointer STATUS.  Note that it is
 574    _NOT_ OK to throw_exception() out of target_wait() without popping
 575    the debugging target from the stack; GDB isn't prepared to get back
 576    to the prompt with a debugging target but without the frame cache,
 577    stop_pc, etc., set up.  */
 578
 579 #define target_wait(ptid, status)               \
 580      (*current_target.to_wait) (ptid, status)
 581
 582 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 583
 584 #define target_fetch_registers(regno)   \
 585      (*current_target.to_fetch_registers) (regno)
 586
 587 /* Store at least register REGNO, or all regs if REGNO == -1.
 588    It can store as many registers as it wants to, so target_prepare_to_store
 589    must have been previously called.  Calls error() if there are problems.  */
 590
 591 #define target_store_registers(regs)    \
 592      (*current_target.to_store_registers) (regs)
 593
 594 /* Get ready to modify the registers array.  On machines which store
 595    individual registers, this doesn't need to do anything.  On machines
 596    which store all the registers in one fell swoop, this makes sure
 597    that REGISTERS contains all the registers from the program being
 598    debugged.  */
 599
 600 #define target_prepare_to_store()       \
 601      (*current_target.to_prepare_to_store) ()
 602
 603 extern DCACHE *target_dcache;
 604
 605 extern int target_read_string (CORE_ADDR, char **, int, int *);
 606
 607 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 608
 609 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 610                                 int len);
 611
 612 extern int xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 613                         struct mem_attrib *, struct target_ops *);
 614
 615 extern int child_xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 616                               struct mem_attrib *, struct target_ops *);
 617
 618 /* Fetches the target's memory map.  If one is found it is sorted
 619    and returned, after some consistency checking.  Otherwise, NULL
 620    is returned.  */
 621 VEC(mem_region_s) *target_memory_map (void);
 622
 623 /* Erase the specified flash region.  */
 624 void target_flash_erase (ULONGEST address, LONGEST length);
 625
 626 /* Finish a sequence of flash operations.  */
 627 void target_flash_done (void);
 628
 629 /* Describes a request for a memory write operation.  */
 630 struct memory_write_request
 631   {
 632     /* Begining address that must be written. */
 633     ULONGEST begin;
 634     /* Past-the-end address. */
 635     ULONGEST end;
 636     /* The data to write. */
 637     gdb_byte *data;
 638     /* A callback baton for progress reporting for this request.  */
 639     void *baton;
 640   };
 641 typedef struct memory_write_request memory_write_request_s;
 642 DEF_VEC_O(memory_write_request_s);
 643
 644 /* Enumeration specifying different flash preservation behaviour.  */
 645 enum flash_preserve_mode
 646   {
 647     flash_preserve,
 648     flash_discard
 649   };
 650
 651 /* Write several memory blocks at once.  This version can be more
 652    efficient than making several calls to target_write_memory, in
 653    particular because it can optimize accesses to flash memory.
 654
 655    Moreover, this is currently the only memory access function in gdb
 656    that supports writing to flash memory, and it should be used for
 657    all cases where access to flash memory is desirable.
 658
 659    REQUESTS is the vector (see vec.h) of memory_write_request.
 660    PRESERVE_FLASH_P indicates what to do with blocks which must be
 661      erased, but not completely rewritten.
 662    PROGRESS_CB is a function that will be periodically called to provide
 663      feedback to user.  It will be called with the baton corresponding
 664      to the request currently being written.  It may also be called
 665      with a NULL baton, when preserved flash sectors are being rewritten.
 666
 667    The function returns 0 on success, and error otherwise.  */
 668 int target_write_memory_blocks (VEC(memory_write_request_s) *requests,
 669                                 enum flash_preserve_mode preserve_flash_p,
 670                                 void (*progress_cb) (ULONGEST, void *));
 671
 672
 673 extern char *child_pid_to_exec_file (int);
 674
 675 extern char *child_core_file_to_sym_file (char *);
 676
 677 #if defined(CHILD_POST_ATTACH)
 678 extern void child_post_attach (int);
 679 #endif
 680
 681 extern void child_post_startup_inferior (ptid_t);
 682
 683 extern void child_acknowledge_created_inferior (int);
 684
 685 extern void child_insert_fork_catchpoint (int);
 686
 687 extern int child_remove_fork_catchpoint (int);
 688
 689 extern void child_insert_vfork_catchpoint (int);
 690
 691 extern int child_remove_vfork_catchpoint (int);
 692
 693 extern void child_acknowledge_created_inferior (int);
 694
 695 extern int child_follow_fork (struct target_ops *, int);
 696
 697 extern void child_insert_exec_catchpoint (int);
 698
 699 extern int child_remove_exec_catchpoint (int);
 700
 701 extern int child_reported_exec_events_per_exec_call (void);
 702
 703 extern int child_has_exited (int, int, int *);
 704
 705 extern int child_thread_alive (ptid_t);
 706
 707 /* From infrun.c.  */
 708
 709 extern int inferior_has_forked (int pid, int *child_pid);
 710
 711 extern int inferior_has_vforked (int pid, int *child_pid);
 712
 713 extern int inferior_has_execd (int pid, char **execd_pathname);
 714
 715 /* From exec.c */
 716
 717 extern void print_section_info (struct target_ops *, bfd *);
 718
 719 /* Print a line about the current target.  */
 720
 721 #define target_files_info()     \
 722      (*current_target.to_files_info) (&current_target)
 723
 724 /* Insert a breakpoint at address BP_TGT->placed_address in the target
 725    machine.  Result is 0 for success, or an errno value.  */
 726
 727 #define target_insert_breakpoint(bp_tgt)        \
 728      (*current_target.to_insert_breakpoint) (bp_tgt)
 729
 730 /* Remove a breakpoint at address BP_TGT->placed_address in the target
 731    machine.  Result is 0 for success, or an errno value.  */
 732
 733 #define target_remove_breakpoint(bp_tgt)        \
 734      (*current_target.to_remove_breakpoint) (bp_tgt)
 735
 736 /* Initialize the terminal settings we record for the inferior,
 737    before we actually run the inferior.  */
 738
 739 #define target_terminal_init() \
 740      (*current_target.to_terminal_init) ()
 741
 742 /* Put the inferior's terminal settings into effect.
 743    This is preparation for starting or resuming the inferior.  */
 744
 745 #define target_terminal_inferior() \
 746      (*current_target.to_terminal_inferior) ()
 747
 748 /* Put some of our terminal settings into effect,
 749    enough to get proper results from our output,
 750    but do not change into or out of RAW mode
 751    so that no input is discarded.
 752
 753    After doing this, either terminal_ours or terminal_inferior
 754    should be called to get back to a normal state of affairs.  */
 755
 756 #define target_terminal_ours_for_output() \
 757      (*current_target.to_terminal_ours_for_output) ()
 758
 759 /* Put our terminal settings into effect.
 760    First record the inferior's terminal settings
 761    so they can be restored properly later.  */
 762
 763 #define target_terminal_ours() \
 764      (*current_target.to_terminal_ours) ()
 765
 766 /* Save our terminal settings.
 767    This is called from TUI after entering or leaving the curses
 768    mode.  Since curses modifies our terminal this call is here
 769    to take this change into account.  */
 770
 771 #define target_terminal_save_ours() \
 772      (*current_target.to_terminal_save_ours) ()
 773
 774 /* Print useful information about our terminal status, if such a thing
 775    exists.  */
 776
 777 #define target_terminal_info(arg, from_tty) \
 778      (*current_target.to_terminal_info) (arg, from_tty)
 779
 780 /* Kill the inferior process.   Make it go away.  */
 781
 782 #define target_kill() \
 783      (*current_target.to_kill) ()
 784
 785 /* Load an executable file into the target process.  This is expected
 786    to not only bring new code into the target process, but also to
 787    update GDB's symbol tables to match.
 788
 789    ARG contains command-line arguments, to be broken down with
 790    buildargv ().  The first non-switch argument is the filename to
 791    load, FILE; the second is a number (as parsed by strtoul (..., ...,
 792    0)), which is an offset to apply to the load addresses of FILE's
 793    sections.  The target may define switches, or other non-switch
 794    arguments, as it pleases.  */
 795
 796 extern void target_load (char *arg, int from_tty);
 797
 798 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 799    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 800    symbol should be returned.  The result is 0 if successful, nonzero
 801    if the symbol does not exist in the target environment.  This
 802    function should not call error() if communication with the target
 803    is interrupted, since it is called from symbol reading, but should
 804    return nonzero, possibly doing a complain().  */
 805
 806 #define target_lookup_symbol(name, addrp) \
 807      (*current_target.to_lookup_symbol) (name, addrp)
 808
 809 /* Start an inferior process and set inferior_ptid to its pid.
 810    EXEC_FILE is the file to run.
 811    ALLARGS is a string containing the arguments to the program.
 812    ENV is the environment vector to pass.  Errors reported with error().
 813    On VxWorks and various standalone systems, we ignore exec_file.  */
 814
 815 #define target_create_inferior(exec_file, args, env, FROM_TTY)  \
 816      (*current_target.to_create_inferior) (exec_file, args, env, (FROM_TTY))
 817
 818
 819 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 820    notification of inferior events such as fork and vork immediately
 821    after the inferior is created.  (This because of how gdb gets an
 822    inferior created via invoking a shell to do it.  In such a scenario,
 823    if the shell init file has commands in it, the shell will fork and
 824    exec for each of those commands, and we will see each such fork
 825    event.  Very bad.)
 826
 827    Such targets will supply an appropriate definition for this function.  */
 828
 829 #define target_post_startup_inferior(ptid) \
 830      (*current_target.to_post_startup_inferior) (ptid)
 831
 832 /* On some targets, the sequence of starting up an inferior requires
 833    some synchronization between gdb and the new inferior process, PID.  */
 834
 835 #define target_acknowledge_created_inferior(pid) \
 836      (*current_target.to_acknowledge_created_inferior) (pid)
 837
 838 /* On some targets, we can catch an inferior fork or vfork event when
 839    it occurs.  These functions insert/remove an already-created
 840    catchpoint for such events.  */
 841
 842 #define target_insert_fork_catchpoint(pid) \
 843      (*current_target.to_insert_fork_catchpoint) (pid)
 844
 845 #define target_remove_fork_catchpoint(pid) \
 846      (*current_target.to_remove_fork_catchpoint) (pid)
 847
 848 #define target_insert_vfork_catchpoint(pid) \
 849      (*current_target.to_insert_vfork_catchpoint) (pid)
 850
 851 #define target_remove_vfork_catchpoint(pid) \
 852      (*current_target.to_remove_vfork_catchpoint) (pid)
 853
 854 /* If the inferior forks or vforks, this function will be called at
 855    the next resume in order to perform any bookkeeping and fiddling
 856    necessary to continue debugging either the parent or child, as
 857    requested, and releasing the other.  Information about the fork
 858    or vfork event is available via get_last_target_status ().
 859    This function returns 1 if the inferior should not be resumed
 860    (i.e. there is another event pending).  */
 861
 862 int target_follow_fork (int follow_child);
 863
 864 /* On some targets, we can catch an inferior exec event when it
 865    occurs.  These functions insert/remove an already-created
 866    catchpoint for such events.  */
 867
 868 #define target_insert_exec_catchpoint(pid) \
 869      (*current_target.to_insert_exec_catchpoint) (pid)
 870
 871 #define target_remove_exec_catchpoint(pid) \
 872      (*current_target.to_remove_exec_catchpoint) (pid)
 873
 874 /* Returns the number of exec events that are reported when a process
 875    invokes a flavor of the exec() system call on this target, if exec
 876    events are being reported.  */
 877
 878 #define target_reported_exec_events_per_exec_call() \
 879      (*current_target.to_reported_exec_events_per_exec_call) ()
 880
 881 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 882    exit code of PID, if any.  */
 883
 884 #define target_has_exited(pid,wait_status,exit_status) \
 885      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 886
 887 /* The debugger has completed a blocking wait() call.  There is now
 888    some process event that must be processed.  This function should
 889    be defined by those targets that require the debugger to perform
 890    cleanup or internal state changes in response to the process event.  */
 891
 892 /* The inferior process has died.  Do what is right.  */
 893
 894 #define target_mourn_inferior() \
 895      (*current_target.to_mourn_inferior) ()
 896
 897 /* Does target have enough data to do a run or attach command? */
 898
 899 #define target_can_run(t) \
 900      ((t)->to_can_run) ()
 901
 902 /* post process changes to signal handling in the inferior.  */
 903
 904 #define target_notice_signals(ptid) \
 905      (*current_target.to_notice_signals) (ptid)
 906
 907 /* Check to see if a thread is still alive.  */
 908
 909 #define target_thread_alive(ptid) \
 910      (*current_target.to_thread_alive) (ptid)
 911
 912 /* Query for new threads and add them to the thread list.  */
 913
 914 #define target_find_new_threads() \
 915      (*current_target.to_find_new_threads) (); \
 916
 917 /* Make target stop in a continuable fashion.  (For instance, under
 918    Unix, this should act like SIGSTOP).  This function is normally
 919    used by GUIs to implement a stop button.  */
 920
 921 #define target_stop current_target.to_stop
 922
 923 /* Send the specified COMMAND to the target's monitor
 924    (shell,interpreter) for execution.  The result of the query is
 925    placed in OUTBUF.  */
 926
 927 #define target_rcmd(command, outbuf) \
 928      (*current_target.to_rcmd) (command, outbuf)
 929
 930
 931 /* Get the symbol information for a breakpointable routine called when
 932    an exception event occurs.
 933    Intended mainly for C++, and for those
 934    platforms/implementations where such a callback mechanism is available,
 935    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 936    different mechanisms for debugging exceptions.  */
 937
 938 #define target_enable_exception_callback(kind, enable) \
 939      (*current_target.to_enable_exception_callback) (kind, enable)
 940
 941 /* Get the current exception event kind -- throw or catch, etc.  */
 942
 943 #define target_get_current_exception_event() \
 944      (*current_target.to_get_current_exception_event) ()
 945
 946 /* Does the target include all of memory, or only part of it?  This
 947    determines whether we look up the target chain for other parts of
 948    memory if this target can't satisfy a request.  */
 949
 950 #define target_has_all_memory   \
 951      (current_target.to_has_all_memory)
 952
 953 /* Does the target include memory?  (Dummy targets don't.)  */
 954
 955 #define target_has_memory       \
 956      (current_target.to_has_memory)
 957
 958 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 959    we start a process.)  */
 960
 961 #define target_has_stack        \
 962      (current_target.to_has_stack)
 963
 964 /* Does the target have registers?  (Exec files don't.)  */
 965
 966 #define target_has_registers    \
 967      (current_target.to_has_registers)
 968
 969 /* Does the target have execution?  Can we make it jump (through
 970    hoops), or pop its stack a few times?  This means that the current
 971    target is currently executing; for some targets, that's the same as
 972    whether or not the target is capable of execution, but there are
 973    also targets which can be current while not executing.  In that
 974    case this will become true after target_create_inferior or
 975    target_attach.  */
 976
 977 #define target_has_execution    \
 978      (current_target.to_has_execution)
 979
 980 /* Can the target support the debugger control of thread execution?
 981    a) Can it lock the thread scheduler?
 982    b) Can it switch the currently running thread?  */
 983
 984 #define target_can_lock_scheduler \
 985      (current_target.to_has_thread_control & tc_schedlock)
 986
 987 #define target_can_switch_threads \
 988      (current_target.to_has_thread_control & tc_switch)
 989
 990 /* Can the target support asynchronous execution? */
 991 #define target_can_async_p() (current_target.to_can_async_p ())
 992
 993 /* Is the target in asynchronous execution mode? */
 994 #define target_is_async_p() (current_target.to_is_async_p())
 995
 996 /* Put the target in async mode with the specified callback function. */
 997 #define target_async(CALLBACK,CONTEXT) \
 998      (current_target.to_async((CALLBACK), (CONTEXT)))
 999
1000 /* This is to be used ONLY within call_function_by_hand(). It provides
1001    a workaround, to have inferior function calls done in sychronous
1002    mode, even though the target is asynchronous. After
1003    target_async_mask(0) is called, calls to target_can_async_p() will
1004    return FALSE , so that target_resume() will not try to start the
1005    target asynchronously. After the inferior stops, we IMMEDIATELY
1006    restore the previous nature of the target, by calling
1007    target_async_mask(1). After that, target_can_async_p() will return
1008    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
1009
1010    FIXME ezannoni 1999-12-13: we won't need this once we move
1011    the turning async on and off to the single execution commands,
1012    from where it is done currently, in remote_resume().  */
1013
1014 #define target_async_mask_value \
1015      (current_target.to_async_mask_value)
1016
1017 extern int target_async_mask (int mask);
1018
1019 /* Converts a process id to a string.  Usually, the string just contains
1020    `process xyz', but on some systems it may contain
1021    `process xyz thread abc'.  */
1022
1023 #undef target_pid_to_str
1024 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
1025
1026 #ifndef target_tid_to_str
1027 #define target_tid_to_str(PID) \
1028      target_pid_to_str (PID)
1029 extern char *normal_pid_to_str (ptid_t ptid);
1030 #endif
1031
1032 /* Return a short string describing extra information about PID,
1033    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
1034    is okay.  */
1035
1036 #define target_extra_thread_info(TP) \
1037      (current_target.to_extra_thread_info (TP))
1038
1039 /*
1040  * New Objfile Event Hook:
1041  *
1042  * Sometimes a GDB component wants to get notified whenever a new
1043  * objfile is loaded.  Mainly this is used by thread-debugging
1044  * implementations that need to know when symbols for the target
1045  * thread implemenation are available.
1046  *
1047  * The old way of doing this is to define a macro 'target_new_objfile'
1048  * that points to the function that you want to be called on every
1049  * objfile/shlib load.
1050
1051    The new way is to grab the function pointer,
1052    'deprecated_target_new_objfile_hook', and point it to the function
1053    that you want to be called on every objfile/shlib load.
1054
1055    If multiple clients are willing to be cooperative, they can each
1056    save a pointer to the previous value of
1057    deprecated_target_new_objfile_hook before modifying it, and arrange
1058    for their function to call the previous function in the chain.  In
1059    that way, multiple clients can receive this notification (something
1060    like with signal handlers).  */
1061
1062 extern void (*deprecated_target_new_objfile_hook) (struct objfile *);
1063
1064 #ifndef target_pid_or_tid_to_str
1065 #define target_pid_or_tid_to_str(ID) \
1066      target_pid_to_str (ID)
1067 #endif
1068
1069 /* Attempts to find the pathname of the executable file
1070    that was run to create a specified process.
1071
1072    The process PID must be stopped when this operation is used.
1073
1074    If the executable file cannot be determined, NULL is returned.
1075
1076    Else, a pointer to a character string containing the pathname
1077    is returned.  This string should be copied into a buffer by
1078    the client if the string will not be immediately used, or if
1079    it must persist.  */
1080
1081 #define target_pid_to_exec_file(pid) \
1082      (current_target.to_pid_to_exec_file) (pid)
1083
1084 /*
1085  * Iterator function for target memory regions.
1086  * Calls a callback function once for each memory region 'mapped'
1087  * in the child process.  Defined as a simple macro rather than
1088  * as a function macro so that it can be tested for nullity.
1089  */
1090
1091 #define target_find_memory_regions(FUNC, DATA) \
1092      (current_target.to_find_memory_regions) (FUNC, DATA)
1093
1094 /*
1095  * Compose corefile .note section.
1096  */
1097
1098 #define target_make_corefile_notes(BFD, SIZE_P) \
1099      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1100
1101 /* Thread-local values.  */
1102 #define target_get_thread_local_address \
1103     (current_target.to_get_thread_local_address)
1104 #define target_get_thread_local_address_p() \
1105     (target_get_thread_local_address != NULL)
1106
1107 /* Hook to call target dependent code just after inferior target process has
1108    started.  */
1109
1110 #ifndef TARGET_CREATE_INFERIOR_HOOK
1111 #define TARGET_CREATE_INFERIOR_HOOK(PID)
1112 #endif
1113
1114 /* Hardware watchpoint interfaces.  */
1115
1116 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1117    write).  */
1118
1119 #ifndef STOPPED_BY_WATCHPOINT
1120 #define STOPPED_BY_WATCHPOINT(w) \
1121    (*current_target.to_stopped_by_watchpoint) ()
1122 #endif
1123
1124 /* Non-zero if we have continuable watchpoints  */
1125
1126 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1127 #define HAVE_CONTINUABLE_WATCHPOINT \
1128    (current_target.to_have_continuable_watchpoint)
1129 #endif
1130
1131 /* Provide defaults for hardware watchpoint functions.  */
1132
1133 /* If the *_hw_beakpoint functions have not been defined
1134    elsewhere use the definitions in the target vector.  */
1135
1136 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1137    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1138    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1139    (including this one?).  OTHERTYPE is who knows what...  */
1140
1141 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1142 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1143  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1144 #endif
1145
1146 #ifndef TARGET_REGION_OK_FOR_HW_WATCHPOINT
1147 #define TARGET_REGION_OK_FOR_HW_WATCHPOINT(addr, len) \
1148     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1149 #endif
1150
1151
1152 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1153    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1154    success, non-zero for failure.  */
1155
1156 #ifndef target_insert_watchpoint
1157 #define target_insert_watchpoint(addr, len, type)       \
1158      (*current_target.to_insert_watchpoint) (addr, len, type)
1159
1160 #define target_remove_watchpoint(addr, len, type)       \
1161      (*current_target.to_remove_watchpoint) (addr, len, type)
1162 #endif
1163
1164 #ifndef target_insert_hw_breakpoint
1165 #define target_insert_hw_breakpoint(bp_tgt) \
1166      (*current_target.to_insert_hw_breakpoint) (bp_tgt)
1167
1168 #define target_remove_hw_breakpoint(bp_tgt) \
1169      (*current_target.to_remove_hw_breakpoint) (bp_tgt)
1170 #endif
1171
1172 extern int target_stopped_data_address_p (struct target_ops *);
1173
1174 #ifndef target_stopped_data_address
1175 #define target_stopped_data_address(target, x) \
1176     (*target.to_stopped_data_address) (target, x)
1177 #else
1178 /* Horrible hack to get around existing macros :-(.  */
1179 #define target_stopped_data_address_p(CURRENT_TARGET) (1)
1180 #endif
1181
1182 /* This will only be defined by a target that supports catching vfork events,
1183    such as HP-UX.
1184
1185    On some targets (such as HP-UX 10.20 and earlier), resuming a newly vforked
1186    child process after it has exec'd, causes the parent process to resume as
1187    well.  To prevent the parent from running spontaneously, such targets should
1188    define this to a function that prevents that from happening.  */
1189 #if !defined(ENSURE_VFORKING_PARENT_REMAINS_STOPPED)
1190 #define ENSURE_VFORKING_PARENT_REMAINS_STOPPED(PID) (0)
1191 #endif
1192
1193 /* This will only be defined by a target that supports catching vfork events,
1194    such as HP-UX.
1195
1196    On some targets (such as HP-UX 10.20 and earlier), a newly vforked child
1197    process must be resumed when it delivers its exec event, before the parent
1198    vfork event will be delivered to us.  */
1199
1200 #if !defined(RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK)
1201 #define RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK() (0)
1202 #endif
1203
1204 /* Routines for maintenance of the target structures...
1205
1206    add_target:   Add a target to the list of all possible targets.
1207
1208    push_target:  Make this target the top of the stack of currently used
1209    targets, within its particular stratum of the stack.  Result
1210    is 0 if now atop the stack, nonzero if not on top (maybe
1211    should warn user).
1212
1213    unpush_target: Remove this from the stack of currently used targets,
1214    no matter where it is on the list.  Returns 0 if no
1215    change, 1 if removed from stack.
1216
1217    pop_target:   Remove the top thing on the stack of current targets.  */
1218
1219 extern void add_target (struct target_ops *);
1220
1221 extern int push_target (struct target_ops *);
1222
1223 extern int unpush_target (struct target_ops *);
1224
1225 extern void target_pre_inferior (int);
1226
1227 extern void target_preopen (int);
1228
1229 extern void pop_target (void);
1230
1231 extern CORE_ADDR target_translate_tls_address (struct objfile *objfile,
1232                                                CORE_ADDR offset);
1233
1234 /* Mark a pushed target as running or exited, for targets which do not
1235    automatically pop when not active.  */
1236
1237 void target_mark_running (struct target_ops *);
1238
1239 void target_mark_exited (struct target_ops *);
1240
1241 /* Struct section_table maps address ranges to file sections.  It is
1242    mostly used with BFD files, but can be used without (e.g. for handling
1243    raw disks, or files not in formats handled by BFD).  */
1244
1245 struct section_table
1246   {
1247     CORE_ADDR addr;             /* Lowest address in section */
1248     CORE_ADDR endaddr;          /* 1+highest address in section */
1249
1250     struct bfd_section *the_bfd_section;
1251
1252     bfd *bfd;                   /* BFD file pointer */
1253   };
1254
1255 /* Return the "section" containing the specified address.  */
1256 struct section_table *target_section_by_addr (struct target_ops *target,
1257                                               CORE_ADDR addr);
1258
1259
1260 /* From mem-break.c */
1261
1262 extern int memory_remove_breakpoint (struct bp_target_info *);
1263
1264 extern int memory_insert_breakpoint (struct bp_target_info *);
1265
1266 extern int default_memory_remove_breakpoint (struct bp_target_info *);
1267
1268 extern int default_memory_insert_breakpoint (struct bp_target_info *);
1269
1270
1271 /* From target.c */
1272
1273 extern void initialize_targets (void);
1274
1275 extern void noprocess (void);
1276
1277 extern void find_default_attach (char *, int);
1278
1279 extern void find_default_create_inferior (char *, char *, char **, int);
1280
1281 extern struct target_ops *find_run_target (void);
1282
1283 extern struct target_ops *find_core_target (void);
1284
1285 extern struct target_ops *find_target_beneath (struct target_ops *);
1286
1287 extern int target_resize_to_sections (struct target_ops *target,
1288                                       int num_added);
1289
1290 extern void remove_target_sections (bfd *abfd);
1291
1292 \f
1293 /* Stuff that should be shared among the various remote targets.  */
1294
1295 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1296    information (higher values, more information).  */
1297 extern int remote_debug;
1298
1299 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1300 extern int baud_rate;
1301 /* Timeout limit for response from target. */
1302 extern int remote_timeout;
1303
1304 \f
1305 /* Functions for helping to write a native target.  */
1306
1307 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1308 extern void store_waitstatus (struct target_waitstatus *, int);
1309
1310 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1311    targ_signal SIGNO has an equivalent ``host'' representation.  */
1312 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1313    to the shorter target_signal_p() because it is far less ambigious.
1314    In this context ``target_signal'' refers to GDB's internal
1315    representation of the target's set of signals while ``host signal''
1316    refers to the target operating system's signal.  Confused?  */
1317
1318 extern int target_signal_to_host_p (enum target_signal signo);
1319
1320 /* Convert between host signal numbers and enum target_signal's.
1321    target_signal_to_host() returns 0 and prints a warning() on GDB's
1322    console if SIGNO has no equivalent host representation.  */
1323 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1324    refering to the target operating system's signal numbering.
1325    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1326    gdb_signal'' would probably be better as it is refering to GDB's
1327    internal representation of a target operating system's signal.  */
1328
1329 extern enum target_signal target_signal_from_host (int);
1330 extern int target_signal_to_host (enum target_signal);
1331
1332 /* Convert from a number used in a GDB command to an enum target_signal.  */
1333 extern enum target_signal target_signal_from_command (int);
1334
1335 /* Any target can call this to switch to remote protocol (in remote.c). */
1336 extern void push_remote_target (char *name, int from_tty);
1337 \f
1338 /* Imported from machine dependent code */
1339
1340 /* Blank target vector entries are initialized to target_ignore. */
1341 void target_ignore (void);
1342
1343 extern struct target_ops deprecated_child_ops;
1344
1345 #endif /* !defined (TARGET_H) */