gdb/target.h

   1 /* Interface between GDB and target environments, including files and processes
   2
   3    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   4    2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
   5    Free Software Foundation, Inc.
   6
   7    Contributed by Cygnus Support.  Written by John Gilmore.
   8
   9    This file is part of GDB.
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  23
  24 #if !defined (TARGET_H)
  25 #define TARGET_H
  26
  27 struct objfile;
  28 struct ui_file;
  29 struct mem_attrib;
  30 struct target_ops;
  31 struct bp_target_info;
  32 struct regcache;
  33
  34 /* This include file defines the interface between the main part
  35    of the debugger, and the part which is target-specific, or
  36    specific to the communications interface between us and the
  37    target.
  38
  39    A TARGET is an interface between the debugger and a particular
  40    kind of file or process.  Targets can be STACKED in STRATA,
  41    so that more than one target can potentially respond to a request.
  42    In particular, memory accesses will walk down the stack of targets
  43    until they find a target that is interested in handling that particular
  44    address.  STRATA are artificial boundaries on the stack, within
  45    which particular kinds of targets live.  Strata exist so that
  46    people don't get confused by pushing e.g. a process target and then
  47    a file target, and wondering why they can't see the current values
  48    of variables any more (the file target is handling them and they
  49    never get to the process target).  So when you push a file target,
  50    it goes into the file stratum, which is always below the process
  51    stratum.  */
  52
  53 #include "bfd.h"
  54 #include "symtab.h"
  55 #include "dcache.h"
  56 #include "memattr.h"
  57 #include "vec.h"
  58
  59 enum strata
  60   {
  61     dummy_stratum,              /* The lowest of the low */
  62     file_stratum,               /* Executable files, etc */
  63     core_stratum,               /* Core dump files */
  64     process_stratum,            /* Executing processes */
  65     thread_stratum              /* Executing threads */
  66   };
  67
  68 enum thread_control_capabilities
  69   {
  70     tc_none = 0,                /* Default: can't control thread execution.  */
  71     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  72   };
  73
  74 /* Stuff for target_wait.  */
  75
  76 /* Generally, what has the program done?  */
  77 enum target_waitkind
  78   {
  79     /* The program has exited.  The exit status is in value.integer.  */
  80     TARGET_WAITKIND_EXITED,
  81
  82     /* The program has stopped with a signal.  Which signal is in
  83        value.sig.  */
  84     TARGET_WAITKIND_STOPPED,
  85
  86     /* The program has terminated with a signal.  Which signal is in
  87        value.sig.  */
  88     TARGET_WAITKIND_SIGNALLED,
  89
  90     /* The program is letting us know that it dynamically loaded something
  91        (e.g. it called load(2) on AIX).  */
  92     TARGET_WAITKIND_LOADED,
  93
  94     /* The program has forked.  A "related" process' ID is in
  95        value.related_pid.  I.e., if the child forks, value.related_pid
  96        is the parent's ID.  */
  97
  98     TARGET_WAITKIND_FORKED,
  99
 100     /* The program has vforked.  A "related" process's ID is in
 101        value.related_pid.  */
 102
 103     TARGET_WAITKIND_VFORKED,
 104
 105     /* The program has exec'ed a new executable file.  The new file's
 106        pathname is pointed to by value.execd_pathname.  */
 107
 108     TARGET_WAITKIND_EXECD,
 109
 110     /* The program has entered or returned from a system call.  On
 111        HP-UX, this is used in the hardware watchpoint implementation.
 112        The syscall's unique integer ID number is in value.syscall_id */
 113
 114     TARGET_WAITKIND_SYSCALL_ENTRY,
 115     TARGET_WAITKIND_SYSCALL_RETURN,
 116
 117     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 118        within target_wait, but I'm not sure target_wait should be resuming the
 119        inferior.  */
 120     TARGET_WAITKIND_SPURIOUS,
 121
 122     /* An event has occured, but we should wait again.
 123        Remote_async_wait() returns this when there is an event
 124        on the inferior, but the rest of the world is not interested in
 125        it. The inferior has not stopped, but has just sent some output
 126        to the console, for instance. In this case, we want to go back
 127        to the event loop and wait there for another event from the
 128        inferior, rather than being stuck in the remote_async_wait()
 129        function. This way the event loop is responsive to other events,
 130        like for instance the user typing.  */
 131     TARGET_WAITKIND_IGNORE
 132   };
 133
 134 struct target_waitstatus
 135   {
 136     enum target_waitkind kind;
 137
 138     /* Forked child pid, execd pathname, exit status or signal number.  */
 139     union
 140       {
 141         int integer;
 142         enum target_signal sig;
 143         int related_pid;
 144         char *execd_pathname;
 145         int syscall_id;
 146       }
 147     value;
 148   };
 149
 150 /* Possible types of events that the inferior handler will have to
 151    deal with.  */
 152 enum inferior_event_type
 153   {
 154     /* There is a request to quit the inferior, abandon it.  */
 155     INF_QUIT_REQ,
 156     /* Process a normal inferior event which will result in target_wait
 157        being called.  */
 158     INF_REG_EVENT,
 159     /* Deal with an error on the inferior.  */
 160     INF_ERROR,
 161     /* We are called because a timer went off.  */
 162     INF_TIMER,
 163     /* We are called to do stuff after the inferior stops.  */
 164     INF_EXEC_COMPLETE,
 165     /* We are called to do some stuff after the inferior stops, but we
 166        are expected to reenter the proceed() and
 167        handle_inferior_event() functions. This is used only in case of
 168        'step n' like commands.  */
 169     INF_EXEC_CONTINUE
 170   };
 171
 172 /* Return the string for a signal.  */
 173 extern char *target_signal_to_string (enum target_signal);
 174
 175 /* Return the name (SIGHUP, etc.) for a signal.  */
 176 extern char *target_signal_to_name (enum target_signal);
 177
 178 /* Given a name (SIGHUP, etc.), return its signal.  */
 179 enum target_signal target_signal_from_name (char *);
 180 \f
 181 /* Target objects which can be transfered using target_read,
 182    target_write, et cetera.  */
 183
 184 enum target_object
 185 {
 186   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 187   TARGET_OBJECT_AVR,
 188   /* SPU target specific transfer.  See "spu-tdep.c".  */
 189   TARGET_OBJECT_SPU,
 190   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 191   TARGET_OBJECT_MEMORY,
 192   /* Memory, avoiding GDB's data cache and trusting the executable.
 193      Target implementations of to_xfer_partial never need to handle
 194      this object, and most callers should not use it.  */
 195   TARGET_OBJECT_RAW_MEMORY,
 196   /* Kernel Unwind Table.  See "ia64-tdep.c".  */
 197   TARGET_OBJECT_UNWIND_TABLE,
 198   /* Transfer auxilliary vector.  */
 199   TARGET_OBJECT_AUXV,
 200   /* StackGhost cookie.  See "sparc-tdep.c".  */
 201   TARGET_OBJECT_WCOOKIE,
 202   /* Target memory map in XML format.  */
 203   TARGET_OBJECT_MEMORY_MAP,
 204   /* Flash memory.  This object can be used to write contents to
 205      a previously erased flash memory.  Using it without erasing
 206      flash can have unexpected results.  Addresses are physical
 207      address on target, and not relative to flash start.  */
 208   TARGET_OBJECT_FLASH,
 209   /* Available target-specific features, e.g. registers and coprocessors.
 210      See "target-descriptions.c".  ANNEX should never be empty.  */
 211   TARGET_OBJECT_AVAILABLE_FEATURES,
 212   /* Currently loaded libraries, in XML format.  */
 213   TARGET_OBJECT_LIBRARIES
 214   /* Possible future objects: TARGET_OBJECT_FILE, TARGET_OBJECT_PROC, ... */
 215 };
 216
 217 /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 218    OBJECT.  The OFFSET, for a seekable object, specifies the
 219    starting point.  The ANNEX can be used to provide additional
 220    data-specific information to the target.
 221
 222    Return the number of bytes actually transfered, or -1 if the
 223    transfer is not supported or otherwise fails.  Return of a positive
 224    value less than LEN indicates that no further transfer is possible.
 225    Unlike the raw to_xfer_partial interface, callers of these
 226    functions do not need to retry partial transfers.  */
 227
 228 extern LONGEST target_read (struct target_ops *ops,
 229                             enum target_object object,
 230                             const char *annex, gdb_byte *buf,
 231                             ULONGEST offset, LONGEST len);
 232
 233 extern LONGEST target_write (struct target_ops *ops,
 234                              enum target_object object,
 235                              const char *annex, const gdb_byte *buf,
 236                              ULONGEST offset, LONGEST len);
 237
 238 /* Similar to target_write, except that it also calls PROGRESS with
 239    the number of bytes written and the opaque BATON after every
 240    successful partial write (and before the first write).  This is
 241    useful for progress reporting and user interaction while writing
 242    data.  To abort the transfer, the progress callback can throw an
 243    exception.  */
 244
 245 LONGEST target_write_with_progress (struct target_ops *ops,
 246                                     enum target_object object,
 247                                     const char *annex, const gdb_byte *buf,
 248                                     ULONGEST offset, LONGEST len,
 249                                     void (*progress) (ULONGEST, void *),
 250                                     void *baton);
 251
 252 /* Wrapper to perform a full read of unknown size.  OBJECT/ANNEX will
 253    be read using OPS.  The return value will be -1 if the transfer
 254    fails or is not supported; 0 if the object is empty; or the length
 255    of the object otherwise.  If a positive value is returned, a
 256    sufficiently large buffer will be allocated using xmalloc and
 257    returned in *BUF_P containing the contents of the object.
 258
 259    This method should be used for objects sufficiently small to store
 260    in a single xmalloc'd buffer, when no fixed bound on the object's
 261    size is known in advance.  Don't try to read TARGET_OBJECT_MEMORY
 262    through this function.  */
 263
 264 extern LONGEST target_read_alloc (struct target_ops *ops,
 265                                   enum target_object object,
 266                                   const char *annex, gdb_byte **buf_p);
 267
 268 /* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and
 269    returned as a string, allocated using xmalloc.  If an error occurs
 270    or the transfer is unsupported, NULL is returned.  Empty objects
 271    are returned as allocated but empty strings.  A warning is issued
 272    if the result contains any embedded NUL bytes.  */
 273
 274 extern char *target_read_stralloc (struct target_ops *ops,
 275                                    enum target_object object,
 276                                    const char *annex);
 277
 278 /* Wrappers to target read/write that perform memory transfers.  They
 279    throw an error if the memory transfer fails.
 280
 281    NOTE: cagney/2003-10-23: The naming schema is lifted from
 282    "frame.h".  The parameter order is lifted from get_frame_memory,
 283    which in turn lifted it from read_memory.  */
 284
 285 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 286                                gdb_byte *buf, LONGEST len);
 287 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 288                                             CORE_ADDR addr, int len);
 289 \f
 290
 291 /* If certain kinds of activity happen, target_wait should perform
 292    callbacks.  */
 293 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 294    on TARGET_ACTIVITY_FD.  */
 295 extern int target_activity_fd;
 296 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 297 extern int (*target_activity_function) (void);
 298 \f
 299 struct thread_info;             /* fwd decl for parameter list below: */
 300
 301 struct target_ops
 302   {
 303     struct target_ops *beneath; /* To the target under this one.  */
 304     char *to_shortname;         /* Name this target type */
 305     char *to_longname;          /* Name for printing */
 306     char *to_doc;               /* Documentation.  Does not include trailing
 307                                    newline, and starts with a one-line descrip-
 308                                    tion (probably similar to to_longname).  */
 309     /* Per-target scratch pad.  */
 310     void *to_data;
 311     /* The open routine takes the rest of the parameters from the
 312        command, and (if successful) pushes a new target onto the
 313        stack.  Targets should supply this routine, if only to provide
 314        an error message.  */
 315     void (*to_open) (char *, int);
 316     /* Old targets with a static target vector provide "to_close".
 317        New re-entrant targets provide "to_xclose" and that is expected
 318        to xfree everything (including the "struct target_ops").  */
 319     void (*to_xclose) (struct target_ops *targ, int quitting);
 320     void (*to_close) (int);
 321     void (*to_attach) (char *, int);
 322     void (*to_post_attach) (int);
 323     void (*to_detach) (char *, int);
 324     void (*to_disconnect) (struct target_ops *, char *, int);
 325     void (*to_resume) (ptid_t, int, enum target_signal);
 326     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 327     void (*to_fetch_registers) (struct regcache *, int);
 328     void (*to_store_registers) (struct regcache *, int);
 329     void (*to_prepare_to_store) (struct regcache *);
 330
 331     /* Transfer LEN bytes of memory between GDB address MYADDR and
 332        target address MEMADDR.  If WRITE, transfer them to the target, else
 333        transfer them from the target.  TARGET is the target from which we
 334        get this function.
 335
 336        Return value, N, is one of the following:
 337
 338        0 means that we can't handle this.  If errno has been set, it is the
 339        error which prevented us from doing it (FIXME: What about bfd_error?).
 340
 341        positive (call it N) means that we have transferred N bytes
 342        starting at MEMADDR.  We might be able to handle more bytes
 343        beyond this length, but no promises.
 344
 345        negative (call its absolute value N) means that we cannot
 346        transfer right at MEMADDR, but we could transfer at least
 347        something at MEMADDR + N.
 348
 349        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 350        to_xfer_partial and inferior inheritance.  */
 351
 352     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 353                                    int len, int write,
 354                                    struct mem_attrib *attrib,
 355                                    struct target_ops *target);
 356
 357     void (*to_files_info) (struct target_ops *);
 358     int (*to_insert_breakpoint) (struct bp_target_info *);
 359     int (*to_remove_breakpoint) (struct bp_target_info *);
 360     int (*to_can_use_hw_breakpoint) (int, int, int);
 361     int (*to_insert_hw_breakpoint) (struct bp_target_info *);
 362     int (*to_remove_hw_breakpoint) (struct bp_target_info *);
 363     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 364     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 365     int (*to_stopped_by_watchpoint) (void);
 366     int to_have_steppable_watchpoint;
 367     int to_have_continuable_watchpoint;
 368     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 369     int (*to_watchpoint_addr_within_range) (struct target_ops *,
 370                                             CORE_ADDR, CORE_ADDR, int);
 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_has_exited) (int, int, int *);
 392     void (*to_mourn_inferior) (void);
 393     int (*to_can_run) (void);
 394     void (*to_notice_signals) (ptid_t ptid);
 395     int (*to_thread_alive) (ptid_t ptid);
 396     void (*to_find_new_threads) (void);
 397     char *(*to_pid_to_str) (ptid_t);
 398     char *(*to_extra_thread_info) (struct thread_info *);
 399     void (*to_stop) (void);
 400     void (*to_rcmd) (char *command, struct ui_file *output);
 401     char *(*to_pid_to_exec_file) (int pid);
 402     void (*to_log_command) (const char *);
 403     enum strata to_stratum;
 404     int to_has_all_memory;
 405     int to_has_memory;
 406     int to_has_stack;
 407     int to_has_registers;
 408     int to_has_execution;
 409     int to_has_thread_control;  /* control thread execution */
 410     struct section_table
 411      *to_sections;
 412     struct section_table
 413      *to_sections_end;
 414     /* ASYNC target controls */
 415     int (*to_can_async_p) (void);
 416     int (*to_is_async_p) (void);
 417     void (*to_async) (void (*) (enum inferior_event_type, void *), void *);
 418     int (*to_async_mask) (int);
 419     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 420                                             unsigned long,
 421                                             int, int, int,
 422                                             void *),
 423                                    void *);
 424     char * (*to_make_corefile_notes) (bfd *, int *);
 425
 426     /* Return the thread-local address at OFFSET in the
 427        thread-local storage for the thread PTID and the shared library
 428        or executable file given by OBJFILE.  If that block of
 429        thread-local storage hasn't been allocated yet, this function
 430        may return an error.  */
 431     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 432                                               CORE_ADDR load_module_addr,
 433                                               CORE_ADDR offset);
 434
 435     /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 436        OBJECT.  The OFFSET, for a seekable object, specifies the
 437        starting point.  The ANNEX can be used to provide additional
 438        data-specific information to the target.
 439
 440        Return the number of bytes actually transfered, zero when no
 441        further transfer is possible, and -1 when the transfer is not
 442        supported.  Return of a positive value smaller than LEN does
 443        not indicate the end of the object, only the end of the
 444        transfer; higher level code should continue transferring if
 445        desired.  This is handled in target.c.
 446
 447        The interface does not support a "retry" mechanism.  Instead it
 448        assumes that at least one byte will be transfered on each
 449        successful call.
 450
 451        NOTE: cagney/2003-10-17: The current interface can lead to
 452        fragmented transfers.  Lower target levels should not implement
 453        hacks, such as enlarging the transfer, in an attempt to
 454        compensate for this.  Instead, the target stack should be
 455        extended so that it implements supply/collect methods and a
 456        look-aside object cache.  With that available, the lowest
 457        target can safely and freely "push" data up the stack.
 458
 459        See target_read and target_write for more information.  One,
 460        and only one, of readbuf or writebuf must be non-NULL.  */
 461
 462     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 463                                 enum target_object object, const char *annex,
 464                                 gdb_byte *readbuf, const gdb_byte *writebuf,
 465                                 ULONGEST offset, LONGEST len);
 466
 467     /* Returns the memory map for the target.  A return value of NULL
 468        means that no memory map is available.  If a memory address
 469        does not fall within any returned regions, it's assumed to be
 470        RAM.  The returned memory regions should not overlap.
 471
 472        The order of regions does not matter; target_memory_map will
 473        sort regions by starting address. For that reason, this
 474        function should not be called directly except via
 475        target_memory_map.
 476
 477        This method should not cache data; if the memory map could
 478        change unexpectedly, it should be invalidated, and higher
 479        layers will re-fetch it.  */
 480     VEC(mem_region_s) *(*to_memory_map) (struct target_ops *);
 481
 482     /* Erases the region of flash memory starting at ADDRESS, of
 483        length LENGTH.
 484
 485        Precondition: both ADDRESS and ADDRESS+LENGTH should be aligned
 486        on flash block boundaries, as reported by 'to_memory_map'.  */
 487     void (*to_flash_erase) (struct target_ops *,
 488                            ULONGEST address, LONGEST length);
 489
 490     /* Finishes a flash memory write sequence.  After this operation
 491        all flash memory should be available for writing and the result
 492        of reading from areas written by 'to_flash_write' should be
 493        equal to what was written.  */
 494     void (*to_flash_done) (struct target_ops *);
 495
 496     /* Describe the architecture-specific features of this target.
 497        Returns the description found, or NULL if no description
 498        was available.  */
 499     const struct target_desc *(*to_read_description) (struct target_ops *ops);
 500
 501     /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
 502        Return 0 if *READPTR is already at the end of the buffer.
 503        Return -1 if there is insufficient buffer for a whole entry.
 504        Return 1 if an entry was read into *TYPEP and *VALP.  */
 505     int (*to_auxv_parse) (struct target_ops *ops, gdb_byte **readptr,
 506                          gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp);
 507
 508     int to_magic;
 509     /* Need sub-structure for target machine related rather than comm related?
 510      */
 511   };
 512
 513 /* Magic number for checking ops size.  If a struct doesn't end with this
 514    number, somebody changed the declaration but didn't change all the
 515    places that initialize one.  */
 516
 517 #define OPS_MAGIC       3840
 518
 519 /* The ops structure for our "current" target process.  This should
 520    never be NULL.  If there is no target, it points to the dummy_target.  */
 521
 522 extern struct target_ops current_target;
 523
 524 /* Define easy words for doing these operations on our current target.  */
 525
 526 #define target_shortname        (current_target.to_shortname)
 527 #define target_longname         (current_target.to_longname)
 528
 529 /* Does whatever cleanup is required for a target that we are no
 530    longer going to be calling.  QUITTING indicates that GDB is exiting
 531    and should not get hung on an error (otherwise it is important to
 532    perform clean termination, even if it takes a while).  This routine
 533    is automatically always called when popping the target off the
 534    target stack (to_beneath is undefined).  Closing file descriptors
 535    and freeing all memory allocated memory are typical things it
 536    should do.  */
 537
 538 void target_close (struct target_ops *targ, int quitting);
 539
 540 /* Attaches to a process on the target side.  Arguments are as passed
 541    to the `attach' command by the user.  This routine can be called
 542    when the target is not on the target-stack, if the target_can_run
 543    routine returns 1; in that case, it must push itself onto the stack.
 544    Upon exit, the target should be ready for normal operations, and
 545    should be ready to deliver the status of the process immediately
 546    (without waiting) to an upcoming target_wait call.  */
 547
 548 #define target_attach(args, from_tty)   \
 549      (*current_target.to_attach) (args, from_tty)
 550
 551 /* The target_attach operation places a process under debugger control,
 552    and stops the process.
 553
 554    This operation provides a target-specific hook that allows the
 555    necessary bookkeeping to be performed after an attach completes.  */
 556 #define target_post_attach(pid) \
 557      (*current_target.to_post_attach) (pid)
 558
 559 /* Takes a program previously attached to and detaches it.
 560    The program may resume execution (some targets do, some don't) and will
 561    no longer stop on signals, etc.  We better not have left any breakpoints
 562    in the program or it'll die when it hits one.  ARGS is arguments
 563    typed by the user (e.g. a signal to send the process).  FROM_TTY
 564    says whether to be verbose or not.  */
 565
 566 extern void target_detach (char *, int);
 567
 568 /* Disconnect from the current target without resuming it (leaving it
 569    waiting for a debugger).  */
 570
 571 extern void target_disconnect (char *, int);
 572
 573 /* Resume execution of the target process PTID.  STEP says whether to
 574    single-step or to run free; SIGGNAL is the signal to be given to
 575    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 576    pass TARGET_SIGNAL_DEFAULT.  */
 577
 578 #define target_resume(ptid, step, siggnal)                              \
 579   do {                                                                  \
 580     dcache_invalidate(target_dcache);                                   \
 581     (*current_target.to_resume) (ptid, step, siggnal);                  \
 582   } while (0)
 583
 584 /* Wait for process pid to do something.  PTID = -1 to wait for any
 585    pid to do something.  Return pid of child, or -1 in case of error;
 586    store status through argument pointer STATUS.  Note that it is
 587    _NOT_ OK to throw_exception() out of target_wait() without popping
 588    the debugging target from the stack; GDB isn't prepared to get back
 589    to the prompt with a debugging target but without the frame cache,
 590    stop_pc, etc., set up.  */
 591
 592 #define target_wait(ptid, status)               \
 593      (*current_target.to_wait) (ptid, status)
 594
 595 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 596
 597 #define target_fetch_registers(regcache, regno) \
 598      (*current_target.to_fetch_registers) (regcache, regno)
 599
 600 /* Store at least register REGNO, or all regs if REGNO == -1.
 601    It can store as many registers as it wants to, so target_prepare_to_store
 602    must have been previously called.  Calls error() if there are problems.  */
 603
 604 #define target_store_registers(regcache, regs)  \
 605      (*current_target.to_store_registers) (regcache, regs)
 606
 607 /* Get ready to modify the registers array.  On machines which store
 608    individual registers, this doesn't need to do anything.  On machines
 609    which store all the registers in one fell swoop, this makes sure
 610    that REGISTERS contains all the registers from the program being
 611    debugged.  */
 612
 613 #define target_prepare_to_store(regcache)       \
 614      (*current_target.to_prepare_to_store) (regcache)
 615
 616 extern DCACHE *target_dcache;
 617
 618 extern int target_read_string (CORE_ADDR, char **, int, int *);
 619
 620 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 621
 622 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 623                                 int len);
 624
 625 extern int xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 626                         struct mem_attrib *, struct target_ops *);
 627
 628 /* Fetches the target's memory map.  If one is found it is sorted
 629    and returned, after some consistency checking.  Otherwise, NULL
 630    is returned.  */
 631 VEC(mem_region_s) *target_memory_map (void);
 632
 633 /* Erase the specified flash region.  */
 634 void target_flash_erase (ULONGEST address, LONGEST length);
 635
 636 /* Finish a sequence of flash operations.  */
 637 void target_flash_done (void);
 638
 639 /* Describes a request for a memory write operation.  */
 640 struct memory_write_request
 641   {
 642     /* Begining address that must be written. */
 643     ULONGEST begin;
 644     /* Past-the-end address. */
 645     ULONGEST end;
 646     /* The data to write. */
 647     gdb_byte *data;
 648     /* A callback baton for progress reporting for this request.  */
 649     void *baton;
 650   };
 651 typedef struct memory_write_request memory_write_request_s;
 652 DEF_VEC_O(memory_write_request_s);
 653
 654 /* Enumeration specifying different flash preservation behaviour.  */
 655 enum flash_preserve_mode
 656   {
 657     flash_preserve,
 658     flash_discard
 659   };
 660
 661 /* Write several memory blocks at once.  This version can be more
 662    efficient than making several calls to target_write_memory, in
 663    particular because it can optimize accesses to flash memory.
 664
 665    Moreover, this is currently the only memory access function in gdb
 666    that supports writing to flash memory, and it should be used for
 667    all cases where access to flash memory is desirable.
 668
 669    REQUESTS is the vector (see vec.h) of memory_write_request.
 670    PRESERVE_FLASH_P indicates what to do with blocks which must be
 671      erased, but not completely rewritten.
 672    PROGRESS_CB is a function that will be periodically called to provide
 673      feedback to user.  It will be called with the baton corresponding
 674      to the request currently being written.  It may also be called
 675      with a NULL baton, when preserved flash sectors are being rewritten.
 676
 677    The function returns 0 on success, and error otherwise.  */
 678 int target_write_memory_blocks (VEC(memory_write_request_s) *requests,
 679                                 enum flash_preserve_mode preserve_flash_p,
 680                                 void (*progress_cb) (ULONGEST, void *));
 681
 682 /* From infrun.c.  */
 683
 684 extern int inferior_has_forked (int pid, int *child_pid);
 685
 686 extern int inferior_has_vforked (int pid, int *child_pid);
 687
 688 extern int inferior_has_execd (int pid, char **execd_pathname);
 689
 690 /* From exec.c */
 691
 692 extern void print_section_info (struct target_ops *, bfd *);
 693
 694 /* Print a line about the current target.  */
 695
 696 #define target_files_info()     \
 697      (*current_target.to_files_info) (&current_target)
 698
 699 /* Insert a breakpoint at address BP_TGT->placed_address in the target
 700    machine.  Result is 0 for success, or an errno value.  */
 701
 702 #define target_insert_breakpoint(bp_tgt)        \
 703      (*current_target.to_insert_breakpoint) (bp_tgt)
 704
 705 /* Remove a breakpoint at address BP_TGT->placed_address in the target
 706    machine.  Result is 0 for success, or an errno value.  */
 707
 708 #define target_remove_breakpoint(bp_tgt)        \
 709      (*current_target.to_remove_breakpoint) (bp_tgt)
 710
 711 /* Initialize the terminal settings we record for the inferior,
 712    before we actually run the inferior.  */
 713
 714 #define target_terminal_init() \
 715      (*current_target.to_terminal_init) ()
 716
 717 /* Put the inferior's terminal settings into effect.
 718    This is preparation for starting or resuming the inferior.  */
 719
 720 #define target_terminal_inferior() \
 721      (*current_target.to_terminal_inferior) ()
 722
 723 /* Put some of our terminal settings into effect,
 724    enough to get proper results from our output,
 725    but do not change into or out of RAW mode
 726    so that no input is discarded.
 727
 728    After doing this, either terminal_ours or terminal_inferior
 729    should be called to get back to a normal state of affairs.  */
 730
 731 #define target_terminal_ours_for_output() \
 732      (*current_target.to_terminal_ours_for_output) ()
 733
 734 /* Put our terminal settings into effect.
 735    First record the inferior's terminal settings
 736    so they can be restored properly later.  */
 737
 738 #define target_terminal_ours() \
 739      (*current_target.to_terminal_ours) ()
 740
 741 /* Save our terminal settings.
 742    This is called from TUI after entering or leaving the curses
 743    mode.  Since curses modifies our terminal this call is here
 744    to take this change into account.  */
 745
 746 #define target_terminal_save_ours() \
 747      (*current_target.to_terminal_save_ours) ()
 748
 749 /* Print useful information about our terminal status, if such a thing
 750    exists.  */
 751
 752 #define target_terminal_info(arg, from_tty) \
 753      (*current_target.to_terminal_info) (arg, from_tty)
 754
 755 /* Kill the inferior process.   Make it go away.  */
 756
 757 #define target_kill() \
 758      (*current_target.to_kill) ()
 759
 760 /* Load an executable file into the target process.  This is expected
 761    to not only bring new code into the target process, but also to
 762    update GDB's symbol tables to match.
 763
 764    ARG contains command-line arguments, to be broken down with
 765    buildargv ().  The first non-switch argument is the filename to
 766    load, FILE; the second is a number (as parsed by strtoul (..., ...,
 767    0)), which is an offset to apply to the load addresses of FILE's
 768    sections.  The target may define switches, or other non-switch
 769    arguments, as it pleases.  */
 770
 771 extern void target_load (char *arg, int from_tty);
 772
 773 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 774    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 775    symbol should be returned.  The result is 0 if successful, nonzero
 776    if the symbol does not exist in the target environment.  This
 777    function should not call error() if communication with the target
 778    is interrupted, since it is called from symbol reading, but should
 779    return nonzero, possibly doing a complain().  */
 780
 781 #define target_lookup_symbol(name, addrp) \
 782      (*current_target.to_lookup_symbol) (name, addrp)
 783
 784 /* Start an inferior process and set inferior_ptid to its pid.
 785    EXEC_FILE is the file to run.
 786    ALLARGS is a string containing the arguments to the program.
 787    ENV is the environment vector to pass.  Errors reported with error().
 788    On VxWorks and various standalone systems, we ignore exec_file.  */
 789
 790 #define target_create_inferior(exec_file, args, env, FROM_TTY)  \
 791      (*current_target.to_create_inferior) (exec_file, args, env, (FROM_TTY))
 792
 793
 794 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 795    notification of inferior events such as fork and vork immediately
 796    after the inferior is created.  (This because of how gdb gets an
 797    inferior created via invoking a shell to do it.  In such a scenario,
 798    if the shell init file has commands in it, the shell will fork and
 799    exec for each of those commands, and we will see each such fork
 800    event.  Very bad.)
 801
 802    Such targets will supply an appropriate definition for this function.  */
 803
 804 #define target_post_startup_inferior(ptid) \
 805      (*current_target.to_post_startup_inferior) (ptid)
 806
 807 /* On some targets, the sequence of starting up an inferior requires
 808    some synchronization between gdb and the new inferior process, PID.  */
 809
 810 #define target_acknowledge_created_inferior(pid) \
 811      (*current_target.to_acknowledge_created_inferior) (pid)
 812
 813 /* On some targets, we can catch an inferior fork or vfork event when
 814    it occurs.  These functions insert/remove an already-created
 815    catchpoint for such events.  */
 816
 817 #define target_insert_fork_catchpoint(pid) \
 818      (*current_target.to_insert_fork_catchpoint) (pid)
 819
 820 #define target_remove_fork_catchpoint(pid) \
 821      (*current_target.to_remove_fork_catchpoint) (pid)
 822
 823 #define target_insert_vfork_catchpoint(pid) \
 824      (*current_target.to_insert_vfork_catchpoint) (pid)
 825
 826 #define target_remove_vfork_catchpoint(pid) \
 827      (*current_target.to_remove_vfork_catchpoint) (pid)
 828
 829 /* If the inferior forks or vforks, this function will be called at
 830    the next resume in order to perform any bookkeeping and fiddling
 831    necessary to continue debugging either the parent or child, as
 832    requested, and releasing the other.  Information about the fork
 833    or vfork event is available via get_last_target_status ().
 834    This function returns 1 if the inferior should not be resumed
 835    (i.e. there is another event pending).  */
 836
 837 int target_follow_fork (int follow_child);
 838
 839 /* On some targets, we can catch an inferior exec event when it
 840    occurs.  These functions insert/remove an already-created
 841    catchpoint for such events.  */
 842
 843 #define target_insert_exec_catchpoint(pid) \
 844      (*current_target.to_insert_exec_catchpoint) (pid)
 845
 846 #define target_remove_exec_catchpoint(pid) \
 847      (*current_target.to_remove_exec_catchpoint) (pid)
 848
 849 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 850    exit code of PID, if any.  */
 851
 852 #define target_has_exited(pid,wait_status,exit_status) \
 853      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 854
 855 /* The debugger has completed a blocking wait() call.  There is now
 856    some process event that must be processed.  This function should
 857    be defined by those targets that require the debugger to perform
 858    cleanup or internal state changes in response to the process event.  */
 859
 860 /* The inferior process has died.  Do what is right.  */
 861
 862 #define target_mourn_inferior() \
 863      (*current_target.to_mourn_inferior) ()
 864
 865 /* Does target have enough data to do a run or attach command? */
 866
 867 #define target_can_run(t) \
 868      ((t)->to_can_run) ()
 869
 870 /* post process changes to signal handling in the inferior.  */
 871
 872 #define target_notice_signals(ptid) \
 873      (*current_target.to_notice_signals) (ptid)
 874
 875 /* Check to see if a thread is still alive.  */
 876
 877 #define target_thread_alive(ptid) \
 878      (*current_target.to_thread_alive) (ptid)
 879
 880 /* Query for new threads and add them to the thread list.  */
 881
 882 #define target_find_new_threads() \
 883      (*current_target.to_find_new_threads) ()
 884
 885 /* Make target stop in a continuable fashion.  (For instance, under
 886    Unix, this should act like SIGSTOP).  This function is normally
 887    used by GUIs to implement a stop button.  */
 888
 889 #define target_stop current_target.to_stop
 890
 891 /* Send the specified COMMAND to the target's monitor
 892    (shell,interpreter) for execution.  The result of the query is
 893    placed in OUTBUF.  */
 894
 895 #define target_rcmd(command, outbuf) \
 896      (*current_target.to_rcmd) (command, outbuf)
 897
 898
 899 /* Does the target include all of memory, or only part of it?  This
 900    determines whether we look up the target chain for other parts of
 901    memory if this target can't satisfy a request.  */
 902
 903 #define target_has_all_memory   \
 904      (current_target.to_has_all_memory)
 905
 906 /* Does the target include memory?  (Dummy targets don't.)  */
 907
 908 #define target_has_memory       \
 909      (current_target.to_has_memory)
 910
 911 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 912    we start a process.)  */
 913
 914 #define target_has_stack        \
 915      (current_target.to_has_stack)
 916
 917 /* Does the target have registers?  (Exec files don't.)  */
 918
 919 #define target_has_registers    \
 920      (current_target.to_has_registers)
 921
 922 /* Does the target have execution?  Can we make it jump (through
 923    hoops), or pop its stack a few times?  This means that the current
 924    target is currently executing; for some targets, that's the same as
 925    whether or not the target is capable of execution, but there are
 926    also targets which can be current while not executing.  In that
 927    case this will become true after target_create_inferior or
 928    target_attach.  */
 929
 930 #define target_has_execution    \
 931      (current_target.to_has_execution)
 932
 933 /* Can the target support the debugger control of thread execution?
 934    Can it lock the thread scheduler?  */
 935
 936 #define target_can_lock_scheduler \
 937      (current_target.to_has_thread_control & tc_schedlock)
 938
 939 /* Can the target support asynchronous execution? */
 940 #define target_can_async_p() (current_target.to_can_async_p ())
 941
 942 /* Is the target in asynchronous execution mode? */
 943 #define target_is_async_p() (current_target.to_is_async_p ())
 944
 945 /* Put the target in async mode with the specified callback function. */
 946 #define target_async(CALLBACK,CONTEXT) \
 947      (current_target.to_async ((CALLBACK), (CONTEXT)))
 948
 949 /* This is to be used ONLY within call_function_by_hand(). It provides
 950    a workaround, to have inferior function calls done in sychronous
 951    mode, even though the target is asynchronous. After
 952    target_async_mask(0) is called, calls to target_can_async_p() will
 953    return FALSE , so that target_resume() will not try to start the
 954    target asynchronously. After the inferior stops, we IMMEDIATELY
 955    restore the previous nature of the target, by calling
 956    target_async_mask(1). After that, target_can_async_p() will return
 957    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 958
 959    FIXME ezannoni 1999-12-13: we won't need this once we move
 960    the turning async on and off to the single execution commands,
 961    from where it is done currently, in remote_resume().  */
 962
 963 #define target_async_mask(MASK) \
 964   (current_target.to_async_mask (MASK))
 965
 966 /* Converts a process id to a string.  Usually, the string just contains
 967    `process xyz', but on some systems it may contain
 968    `process xyz thread abc'.  */
 969
 970 #undef target_pid_to_str
 971 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
 972
 973 #ifndef target_tid_to_str
 974 #define target_tid_to_str(PID) \
 975      target_pid_to_str (PID)
 976 extern char *normal_pid_to_str (ptid_t ptid);
 977 #endif
 978
 979 /* Return a short string describing extra information about PID,
 980    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
 981    is okay.  */
 982
 983 #define target_extra_thread_info(TP) \
 984      (current_target.to_extra_thread_info (TP))
 985
 986 /* Attempts to find the pathname of the executable file
 987    that was run to create a specified process.
 988
 989    The process PID must be stopped when this operation is used.
 990
 991    If the executable file cannot be determined, NULL is returned.
 992
 993    Else, a pointer to a character string containing the pathname
 994    is returned.  This string should be copied into a buffer by
 995    the client if the string will not be immediately used, or if
 996    it must persist.  */
 997
 998 #define target_pid_to_exec_file(pid) \
 999      (current_target.to_pid_to_exec_file) (pid)
1000
1001 /*
1002  * Iterator function for target memory regions.
1003  * Calls a callback function once for each memory region 'mapped'
1004  * in the child process.  Defined as a simple macro rather than
1005  * as a function macro so that it can be tested for nullity.
1006  */
1007
1008 #define target_find_memory_regions(FUNC, DATA) \
1009      (current_target.to_find_memory_regions) (FUNC, DATA)
1010
1011 /*
1012  * Compose corefile .note section.
1013  */
1014
1015 #define target_make_corefile_notes(BFD, SIZE_P) \
1016      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1017
1018 /* Thread-local values.  */
1019 #define target_get_thread_local_address \
1020     (current_target.to_get_thread_local_address)
1021 #define target_get_thread_local_address_p() \
1022     (target_get_thread_local_address != NULL)
1023
1024
1025 /* Hardware watchpoint interfaces.  */
1026
1027 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1028    write).  */
1029
1030 #ifndef STOPPED_BY_WATCHPOINT
1031 #define STOPPED_BY_WATCHPOINT(w) \
1032    (*current_target.to_stopped_by_watchpoint) ()
1033 #endif
1034
1035 /* Non-zero if we have steppable watchpoints  */
1036
1037 #ifndef HAVE_STEPPABLE_WATCHPOINT
1038 #define HAVE_STEPPABLE_WATCHPOINT \
1039    (current_target.to_have_steppable_watchpoint)
1040 #endif
1041
1042 /* Non-zero if we have continuable watchpoints  */
1043
1044 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1045 #define HAVE_CONTINUABLE_WATCHPOINT \
1046    (current_target.to_have_continuable_watchpoint)
1047 #endif
1048
1049 /* Provide defaults for hardware watchpoint functions.  */
1050
1051 /* If the *_hw_beakpoint functions have not been defined
1052    elsewhere use the definitions in the target vector.  */
1053
1054 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1055    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1056    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1057    (including this one?).  OTHERTYPE is who knows what...  */
1058
1059 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1060 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1061  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1062 #endif
1063
1064 #ifndef TARGET_REGION_OK_FOR_HW_WATCHPOINT
1065 #define TARGET_REGION_OK_FOR_HW_WATCHPOINT(addr, len) \
1066     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1067 #endif
1068
1069
1070 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1071    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1072    success, non-zero for failure.  */
1073
1074 #ifndef target_insert_watchpoint
1075 #define target_insert_watchpoint(addr, len, type)       \
1076      (*current_target.to_insert_watchpoint) (addr, len, type)
1077
1078 #define target_remove_watchpoint(addr, len, type)       \
1079      (*current_target.to_remove_watchpoint) (addr, len, type)
1080 #endif
1081
1082 #ifndef target_insert_hw_breakpoint
1083 #define target_insert_hw_breakpoint(bp_tgt) \
1084      (*current_target.to_insert_hw_breakpoint) (bp_tgt)
1085
1086 #define target_remove_hw_breakpoint(bp_tgt) \
1087      (*current_target.to_remove_hw_breakpoint) (bp_tgt)
1088 #endif
1089
1090 extern int target_stopped_data_address_p (struct target_ops *);
1091
1092 #ifndef target_stopped_data_address
1093 #define target_stopped_data_address(target, x) \
1094     (*target.to_stopped_data_address) (target, x)
1095 #else
1096 /* Horrible hack to get around existing macros :-(.  */
1097 #define target_stopped_data_address_p(CURRENT_TARGET) (1)
1098 #endif
1099
1100 #define target_watchpoint_addr_within_range(target, addr, start, length) \
1101   (*target.to_watchpoint_addr_within_range) (target, addr, start, length)
1102
1103 extern const struct target_desc *target_read_description (struct target_ops *);
1104
1105 /* Command logging facility.  */
1106
1107 #define target_log_command(p)                                           \
1108   do                                                                    \
1109     if (current_target.to_log_command)                                  \
1110       (*current_target.to_log_command) (p);                             \
1111   while (0)
1112
1113 /* Routines for maintenance of the target structures...
1114
1115    add_target:   Add a target to the list of all possible targets.
1116
1117    push_target:  Make this target the top of the stack of currently used
1118    targets, within its particular stratum of the stack.  Result
1119    is 0 if now atop the stack, nonzero if not on top (maybe
1120    should warn user).
1121
1122    unpush_target: Remove this from the stack of currently used targets,
1123    no matter where it is on the list.  Returns 0 if no
1124    change, 1 if removed from stack.
1125
1126    pop_target:   Remove the top thing on the stack of current targets.  */
1127
1128 extern void add_target (struct target_ops *);
1129
1130 extern int push_target (struct target_ops *);
1131
1132 extern int unpush_target (struct target_ops *);
1133
1134 extern void target_pre_inferior (int);
1135
1136 extern void target_preopen (int);
1137
1138 extern void pop_target (void);
1139
1140 extern CORE_ADDR target_translate_tls_address (struct objfile *objfile,
1141                                                CORE_ADDR offset);
1142
1143 /* Mark a pushed target as running or exited, for targets which do not
1144    automatically pop when not active.  */
1145
1146 void target_mark_running (struct target_ops *);
1147
1148 void target_mark_exited (struct target_ops *);
1149
1150 /* Struct section_table maps address ranges to file sections.  It is
1151    mostly used with BFD files, but can be used without (e.g. for handling
1152    raw disks, or files not in formats handled by BFD).  */
1153
1154 struct section_table
1155   {
1156     CORE_ADDR addr;             /* Lowest address in section */
1157     CORE_ADDR endaddr;          /* 1+highest address in section */
1158
1159     struct bfd_section *the_bfd_section;
1160
1161     bfd *bfd;                   /* BFD file pointer */
1162   };
1163
1164 /* Return the "section" containing the specified address.  */
1165 struct section_table *target_section_by_addr (struct target_ops *target,
1166                                               CORE_ADDR addr);
1167
1168
1169 /* From mem-break.c */
1170
1171 extern int memory_remove_breakpoint (struct bp_target_info *);
1172
1173 extern int memory_insert_breakpoint (struct bp_target_info *);
1174
1175 extern int default_memory_remove_breakpoint (struct gdbarch *, struct bp_target_info *);
1176
1177 extern int default_memory_insert_breakpoint (struct gdbarch *, struct bp_target_info *);
1178
1179
1180 /* From target.c */
1181
1182 extern void initialize_targets (void);
1183
1184 extern void noprocess (void);
1185
1186 extern void target_require_runnable (void);
1187
1188 extern void find_default_attach (char *, int);
1189
1190 extern void find_default_create_inferior (char *, char *, char **, int);
1191
1192 extern struct target_ops *find_run_target (void);
1193
1194 extern struct target_ops *find_core_target (void);
1195
1196 extern struct target_ops *find_target_beneath (struct target_ops *);
1197
1198 extern int target_resize_to_sections (struct target_ops *target,
1199                                       int num_added);
1200
1201 extern void remove_target_sections (bfd *abfd);
1202
1203 \f
1204 /* Stuff that should be shared among the various remote targets.  */
1205
1206 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1207    information (higher values, more information).  */
1208 extern int remote_debug;
1209
1210 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1211 extern int baud_rate;
1212 /* Timeout limit for response from target. */
1213 extern int remote_timeout;
1214
1215 \f
1216 /* Functions for helping to write a native target.  */
1217
1218 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1219 extern void store_waitstatus (struct target_waitstatus *, int);
1220
1221 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1222    targ_signal SIGNO has an equivalent ``host'' representation.  */
1223 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1224    to the shorter target_signal_p() because it is far less ambigious.
1225    In this context ``target_signal'' refers to GDB's internal
1226    representation of the target's set of signals while ``host signal''
1227    refers to the target operating system's signal.  Confused?  */
1228
1229 extern int target_signal_to_host_p (enum target_signal signo);
1230
1231 /* Convert between host signal numbers and enum target_signal's.
1232    target_signal_to_host() returns 0 and prints a warning() on GDB's
1233    console if SIGNO has no equivalent host representation.  */
1234 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1235    refering to the target operating system's signal numbering.
1236    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1237    gdb_signal'' would probably be better as it is refering to GDB's
1238    internal representation of a target operating system's signal.  */
1239
1240 extern enum target_signal target_signal_from_host (int);
1241 extern int target_signal_to_host (enum target_signal);
1242
1243 extern enum target_signal default_target_signal_from_host (struct gdbarch *,
1244                                                            int);
1245 extern int default_target_signal_to_host (struct gdbarch *,
1246                                           enum target_signal);
1247
1248 /* Convert from a number used in a GDB command to an enum target_signal.  */
1249 extern enum target_signal target_signal_from_command (int);
1250
1251 /* Any target can call this to switch to remote protocol (in remote.c). */
1252 extern void push_remote_target (char *name, int from_tty);
1253
1254 /* Set the show memory breakpoints mode to show, and installs a cleanup
1255    to restore it back to the current value.  */
1256 extern struct cleanup *make_show_memory_breakpoints_cleanup (int show);
1257
1258 \f
1259 /* Imported from machine dependent code */
1260
1261 /* Blank target vector entries are initialized to target_ignore. */
1262 void target_ignore (void);
1263
1264 extern struct target_ops deprecated_child_ops;
1265
1266 #endif /* !defined (TARGET_H) */