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, 2009
   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' PTID 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 PTID 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     /* The target has run out of history information,
 134        and cannot run backward any further.  */
 135     TARGET_WAITKIND_NO_HISTORY
 136   };
 137
 138 struct target_waitstatus
 139   {
 140     enum target_waitkind kind;
 141
 142     /* Forked child pid, execd pathname, exit status or signal number.  */
 143     union
 144       {
 145         int integer;
 146         enum target_signal sig;
 147         ptid_t related_pid;
 148         char *execd_pathname;
 149         int syscall_id;
 150       }
 151     value;
 152   };
 153
 154 /* Return a pretty printed form of target_waitstatus.
 155    Space for the result is malloc'd, caller must free.  */
 156 extern char *target_waitstatus_to_string (const struct target_waitstatus *);
 157
 158 /* Possible types of events that the inferior handler will have to
 159    deal with.  */
 160 enum inferior_event_type
 161   {
 162     /* There is a request to quit the inferior, abandon it.  */
 163     INF_QUIT_REQ,
 164     /* Process a normal inferior event which will result in target_wait
 165        being called.  */
 166     INF_REG_EVENT,
 167     /* Deal with an error on the inferior.  */
 168     INF_ERROR,
 169     /* We are called because a timer went off.  */
 170     INF_TIMER,
 171     /* We are called to do stuff after the inferior stops.  */
 172     INF_EXEC_COMPLETE,
 173     /* We are called to do some stuff after the inferior stops, but we
 174        are expected to reenter the proceed() and
 175        handle_inferior_event() functions. This is used only in case of
 176        'step n' like commands.  */
 177     INF_EXEC_CONTINUE
 178   };
 179
 180 /* Return the string for a signal.  */
 181 extern const char *target_signal_to_string (enum target_signal);
 182
 183 /* Return the name (SIGHUP, etc.) for a signal.  */
 184 extern const char *target_signal_to_name (enum target_signal);
 185
 186 /* Given a name (SIGHUP, etc.), return its signal.  */
 187 enum target_signal target_signal_from_name (const char *);
 188 \f
 189 /* Target objects which can be transfered using target_read,
 190    target_write, et cetera.  */
 191
 192 enum target_object
 193 {
 194   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 195   TARGET_OBJECT_AVR,
 196   /* SPU target specific transfer.  See "spu-tdep.c".  */
 197   TARGET_OBJECT_SPU,
 198   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 199   TARGET_OBJECT_MEMORY,
 200   /* Memory, avoiding GDB's data cache and trusting the executable.
 201      Target implementations of to_xfer_partial never need to handle
 202      this object, and most callers should not use it.  */
 203   TARGET_OBJECT_RAW_MEMORY,
 204   /* Kernel Unwind Table.  See "ia64-tdep.c".  */
 205   TARGET_OBJECT_UNWIND_TABLE,
 206   /* Transfer auxilliary vector.  */
 207   TARGET_OBJECT_AUXV,
 208   /* StackGhost cookie.  See "sparc-tdep.c".  */
 209   TARGET_OBJECT_WCOOKIE,
 210   /* Target memory map in XML format.  */
 211   TARGET_OBJECT_MEMORY_MAP,
 212   /* Flash memory.  This object can be used to write contents to
 213      a previously erased flash memory.  Using it without erasing
 214      flash can have unexpected results.  Addresses are physical
 215      address on target, and not relative to flash start.  */
 216   TARGET_OBJECT_FLASH,
 217   /* Available target-specific features, e.g. registers and coprocessors.
 218      See "target-descriptions.c".  ANNEX should never be empty.  */
 219   TARGET_OBJECT_AVAILABLE_FEATURES,
 220   /* Currently loaded libraries, in XML format.  */
 221   TARGET_OBJECT_LIBRARIES,
 222   /* Get OS specific data.  The ANNEX specifies the type (running
 223      processes, etc.).  */
 224   TARGET_OBJECT_OSDATA
 225   /* Possible future objects: TARGET_OBJECT_FILE, ... */
 226 };
 227
 228 /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 229    OBJECT.  The OFFSET, for a seekable object, specifies the
 230    starting point.  The ANNEX can be used to provide additional
 231    data-specific information to the target.
 232
 233    Return the number of bytes actually transfered, or -1 if the
 234    transfer is not supported or otherwise fails.  Return of a positive
 235    value less than LEN indicates that no further transfer is possible.
 236    Unlike the raw to_xfer_partial interface, callers of these
 237    functions do not need to retry partial transfers.  */
 238
 239 extern LONGEST target_read (struct target_ops *ops,
 240                             enum target_object object,
 241                             const char *annex, gdb_byte *buf,
 242                             ULONGEST offset, LONGEST len);
 243
 244 extern LONGEST target_read_until_error (struct target_ops *ops,
 245                                         enum target_object object,
 246                                         const char *annex, gdb_byte *buf,
 247                                         ULONGEST offset, LONGEST len);
 248
 249 extern LONGEST target_write (struct target_ops *ops,
 250                              enum target_object object,
 251                              const char *annex, const gdb_byte *buf,
 252                              ULONGEST offset, LONGEST len);
 253
 254 /* Similar to target_write, except that it also calls PROGRESS with
 255    the number of bytes written and the opaque BATON after every
 256    successful partial write (and before the first write).  This is
 257    useful for progress reporting and user interaction while writing
 258    data.  To abort the transfer, the progress callback can throw an
 259    exception.  */
 260
 261 LONGEST target_write_with_progress (struct target_ops *ops,
 262                                     enum target_object object,
 263                                     const char *annex, const gdb_byte *buf,
 264                                     ULONGEST offset, LONGEST len,
 265                                     void (*progress) (ULONGEST, void *),
 266                                     void *baton);
 267
 268 /* Wrapper to perform a full read of unknown size.  OBJECT/ANNEX will
 269    be read using OPS.  The return value will be -1 if the transfer
 270    fails or is not supported; 0 if the object is empty; or the length
 271    of the object otherwise.  If a positive value is returned, a
 272    sufficiently large buffer will be allocated using xmalloc and
 273    returned in *BUF_P containing the contents of the object.
 274
 275    This method should be used for objects sufficiently small to store
 276    in a single xmalloc'd buffer, when no fixed bound on the object's
 277    size is known in advance.  Don't try to read TARGET_OBJECT_MEMORY
 278    through this function.  */
 279
 280 extern LONGEST target_read_alloc (struct target_ops *ops,
 281                                   enum target_object object,
 282                                   const char *annex, gdb_byte **buf_p);
 283
 284 /* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and
 285    returned as a string, allocated using xmalloc.  If an error occurs
 286    or the transfer is unsupported, NULL is returned.  Empty objects
 287    are returned as allocated but empty strings.  A warning is issued
 288    if the result contains any embedded NUL bytes.  */
 289
 290 extern char *target_read_stralloc (struct target_ops *ops,
 291                                    enum target_object object,
 292                                    const char *annex);
 293
 294 /* Wrappers to target read/write that perform memory transfers.  They
 295    throw an error if the memory transfer fails.
 296
 297    NOTE: cagney/2003-10-23: The naming schema is lifted from
 298    "frame.h".  The parameter order is lifted from get_frame_memory,
 299    which in turn lifted it from read_memory.  */
 300
 301 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 302                                gdb_byte *buf, LONGEST len);
 303 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 304                                             CORE_ADDR addr, int len);
 305 \f
 306 struct thread_info;             /* fwd decl for parameter list below: */
 307
 308 struct target_ops
 309   {
 310     struct target_ops *beneath; /* To the target under this one.  */
 311     char *to_shortname;         /* Name this target type */
 312     char *to_longname;          /* Name for printing */
 313     char *to_doc;               /* Documentation.  Does not include trailing
 314                                    newline, and starts with a one-line descrip-
 315                                    tion (probably similar to to_longname).  */
 316     /* Per-target scratch pad.  */
 317     void *to_data;
 318     /* The open routine takes the rest of the parameters from the
 319        command, and (if successful) pushes a new target onto the
 320        stack.  Targets should supply this routine, if only to provide
 321        an error message.  */
 322     void (*to_open) (char *, int);
 323     /* Old targets with a static target vector provide "to_close".
 324        New re-entrant targets provide "to_xclose" and that is expected
 325        to xfree everything (including the "struct target_ops").  */
 326     void (*to_xclose) (struct target_ops *targ, int quitting);
 327     void (*to_close) (int);
 328     void (*to_attach) (struct target_ops *ops, char *, int);
 329     void (*to_post_attach) (int);
 330     void (*to_detach) (struct target_ops *ops, char *, int);
 331     void (*to_disconnect) (struct target_ops *, char *, int);
 332     void (*to_resume) (ptid_t, int, enum target_signal);
 333     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 334     void (*to_fetch_registers) (struct regcache *, int);
 335     void (*to_store_registers) (struct regcache *, int);
 336     void (*to_prepare_to_store) (struct regcache *);
 337
 338     /* Transfer LEN bytes of memory between GDB address MYADDR and
 339        target address MEMADDR.  If WRITE, transfer them to the target, else
 340        transfer them from the target.  TARGET is the target from which we
 341        get this function.
 342
 343        Return value, N, is one of the following:
 344
 345        0 means that we can't handle this.  If errno has been set, it is the
 346        error which prevented us from doing it (FIXME: What about bfd_error?).
 347
 348        positive (call it N) means that we have transferred N bytes
 349        starting at MEMADDR.  We might be able to handle more bytes
 350        beyond this length, but no promises.
 351
 352        negative (call its absolute value N) means that we cannot
 353        transfer right at MEMADDR, but we could transfer at least
 354        something at MEMADDR + N.
 355
 356        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 357        to_xfer_partial and inferior inheritance.  */
 358
 359     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 360                                    int len, int write,
 361                                    struct mem_attrib *attrib,
 362                                    struct target_ops *target);
 363
 364     void (*to_files_info) (struct target_ops *);
 365     int (*to_insert_breakpoint) (struct bp_target_info *);
 366     int (*to_remove_breakpoint) (struct bp_target_info *);
 367     int (*to_can_use_hw_breakpoint) (int, int, int);
 368     int (*to_insert_hw_breakpoint) (struct bp_target_info *);
 369     int (*to_remove_hw_breakpoint) (struct bp_target_info *);
 370     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 371     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 372     int (*to_stopped_by_watchpoint) (void);
 373     int to_have_steppable_watchpoint;
 374     int to_have_continuable_watchpoint;
 375     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 376     int (*to_watchpoint_addr_within_range) (struct target_ops *,
 377                                             CORE_ADDR, CORE_ADDR, int);
 378     int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);
 379     void (*to_terminal_init) (void);
 380     void (*to_terminal_inferior) (void);
 381     void (*to_terminal_ours_for_output) (void);
 382     void (*to_terminal_ours) (void);
 383     void (*to_terminal_save_ours) (void);
 384     void (*to_terminal_info) (char *, int);
 385     void (*to_kill) (void);
 386     void (*to_load) (char *, int);
 387     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 388     void (*to_create_inferior) (struct target_ops *,
 389                                 char *, char *, char **, int);
 390     void (*to_post_startup_inferior) (ptid_t);
 391     void (*to_acknowledge_created_inferior) (int);
 392     void (*to_insert_fork_catchpoint) (int);
 393     int (*to_remove_fork_catchpoint) (int);
 394     void (*to_insert_vfork_catchpoint) (int);
 395     int (*to_remove_vfork_catchpoint) (int);
 396     int (*to_follow_fork) (struct target_ops *, int);
 397     void (*to_insert_exec_catchpoint) (int);
 398     int (*to_remove_exec_catchpoint) (int);
 399     int (*to_has_exited) (int, int, int *);
 400     void (*to_mourn_inferior) (struct target_ops *);
 401     int (*to_can_run) (void);
 402     void (*to_notice_signals) (ptid_t ptid);
 403     int (*to_thread_alive) (ptid_t ptid);
 404     void (*to_find_new_threads) (void);
 405     char *(*to_pid_to_str) (ptid_t);
 406     char *(*to_extra_thread_info) (struct thread_info *);
 407     void (*to_stop) (ptid_t);
 408     void (*to_rcmd) (char *command, struct ui_file *output);
 409     char *(*to_pid_to_exec_file) (int pid);
 410     void (*to_log_command) (const char *);
 411     enum strata to_stratum;
 412     int to_has_all_memory;
 413     int to_has_memory;
 414     int to_has_stack;
 415     int to_has_registers;
 416     int to_has_execution;
 417     int to_has_thread_control;  /* control thread execution */
 418     int to_attach_no_wait;
 419     struct section_table
 420      *to_sections;
 421     struct section_table
 422      *to_sections_end;
 423     /* ASYNC target controls */
 424     int (*to_can_async_p) (void);
 425     int (*to_is_async_p) (void);
 426     void (*to_async) (void (*) (enum inferior_event_type, void *), void *);
 427     int (*to_async_mask) (int);
 428     int (*to_supports_non_stop) (void);
 429     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 430                                             unsigned long,
 431                                             int, int, int,
 432                                             void *),
 433                                    void *);
 434     char * (*to_make_corefile_notes) (bfd *, int *);
 435
 436     /* Return the thread-local address at OFFSET in the
 437        thread-local storage for the thread PTID and the shared library
 438        or executable file given by OBJFILE.  If that block of
 439        thread-local storage hasn't been allocated yet, this function
 440        may return an error.  */
 441     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 442                                               CORE_ADDR load_module_addr,
 443                                               CORE_ADDR offset);
 444
 445     /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 446        OBJECT.  The OFFSET, for a seekable object, specifies the
 447        starting point.  The ANNEX can be used to provide additional
 448        data-specific information to the target.
 449
 450        Return the number of bytes actually transfered, zero when no
 451        further transfer is possible, and -1 when the transfer is not
 452        supported.  Return of a positive value smaller than LEN does
 453        not indicate the end of the object, only the end of the
 454        transfer; higher level code should continue transferring if
 455        desired.  This is handled in target.c.
 456
 457        The interface does not support a "retry" mechanism.  Instead it
 458        assumes that at least one byte will be transfered on each
 459        successful call.
 460
 461        NOTE: cagney/2003-10-17: The current interface can lead to
 462        fragmented transfers.  Lower target levels should not implement
 463        hacks, such as enlarging the transfer, in an attempt to
 464        compensate for this.  Instead, the target stack should be
 465        extended so that it implements supply/collect methods and a
 466        look-aside object cache.  With that available, the lowest
 467        target can safely and freely "push" data up the stack.
 468
 469        See target_read and target_write for more information.  One,
 470        and only one, of readbuf or writebuf must be non-NULL.  */
 471
 472     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 473                                 enum target_object object, const char *annex,
 474                                 gdb_byte *readbuf, const gdb_byte *writebuf,
 475                                 ULONGEST offset, LONGEST len);
 476
 477     /* Returns the memory map for the target.  A return value of NULL
 478        means that no memory map is available.  If a memory address
 479        does not fall within any returned regions, it's assumed to be
 480        RAM.  The returned memory regions should not overlap.
 481
 482        The order of regions does not matter; target_memory_map will
 483        sort regions by starting address. For that reason, this
 484        function should not be called directly except via
 485        target_memory_map.
 486
 487        This method should not cache data; if the memory map could
 488        change unexpectedly, it should be invalidated, and higher
 489        layers will re-fetch it.  */
 490     VEC(mem_region_s) *(*to_memory_map) (struct target_ops *);
 491
 492     /* Erases the region of flash memory starting at ADDRESS, of
 493        length LENGTH.
 494
 495        Precondition: both ADDRESS and ADDRESS+LENGTH should be aligned
 496        on flash block boundaries, as reported by 'to_memory_map'.  */
 497     void (*to_flash_erase) (struct target_ops *,
 498                            ULONGEST address, LONGEST length);
 499
 500     /* Finishes a flash memory write sequence.  After this operation
 501        all flash memory should be available for writing and the result
 502        of reading from areas written by 'to_flash_write' should be
 503        equal to what was written.  */
 504     void (*to_flash_done) (struct target_ops *);
 505
 506     /* Describe the architecture-specific features of this target.
 507        Returns the description found, or NULL if no description
 508        was available.  */
 509     const struct target_desc *(*to_read_description) (struct target_ops *ops);
 510
 511     /* Build the PTID of the thread on which a given task is running,
 512        based on LWP and THREAD.  These values are extracted from the
 513        task Private_Data section of the Ada Task Control Block, and
 514        their interpretation depends on the target.  */
 515     ptid_t (*to_get_ada_task_ptid) (long lwp, long thread);
 516
 517     /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
 518        Return 0 if *READPTR is already at the end of the buffer.
 519        Return -1 if there is insufficient buffer for a whole entry.
 520        Return 1 if an entry was read into *TYPEP and *VALP.  */
 521     int (*to_auxv_parse) (struct target_ops *ops, gdb_byte **readptr,
 522                          gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp);
 523
 524     /* Search SEARCH_SPACE_LEN bytes beginning at START_ADDR for the
 525        sequence of bytes in PATTERN with length PATTERN_LEN.
 526
 527        The result is 1 if found, 0 if not found, and -1 if there was an error
 528        requiring halting of the search (e.g. memory read error).
 529        If the pattern is found the address is recorded in FOUND_ADDRP.  */
 530     int (*to_search_memory) (struct target_ops *ops,
 531                              CORE_ADDR start_addr, ULONGEST search_space_len,
 532                              const gdb_byte *pattern, ULONGEST pattern_len,
 533                              CORE_ADDR *found_addrp);
 534
 535     /* Can target execute in reverse?  */
 536     int (*to_can_execute_reverse) ();
 537
 538     /* Does this target support debugging multiple processes
 539        simultaneously?  */
 540     int (*to_supports_multi_process) (void);
 541
 542     int to_magic;
 543     /* Need sub-structure for target machine related rather than comm related?
 544      */
 545   };
 546
 547 /* Magic number for checking ops size.  If a struct doesn't end with this
 548    number, somebody changed the declaration but didn't change all the
 549    places that initialize one.  */
 550
 551 #define OPS_MAGIC       3840
 552
 553 /* The ops structure for our "current" target process.  This should
 554    never be NULL.  If there is no target, it points to the dummy_target.  */
 555
 556 extern struct target_ops current_target;
 557
 558 /* Define easy words for doing these operations on our current target.  */
 559
 560 #define target_shortname        (current_target.to_shortname)
 561 #define target_longname         (current_target.to_longname)
 562
 563 /* Does whatever cleanup is required for a target that we are no
 564    longer going to be calling.  QUITTING indicates that GDB is exiting
 565    and should not get hung on an error (otherwise it is important to
 566    perform clean termination, even if it takes a while).  This routine
 567    is automatically always called when popping the target off the
 568    target stack (to_beneath is undefined).  Closing file descriptors
 569    and freeing all memory allocated memory are typical things it
 570    should do.  */
 571
 572 void target_close (struct target_ops *targ, int quitting);
 573
 574 /* Attaches to a process on the target side.  Arguments are as passed
 575    to the `attach' command by the user.  This routine can be called
 576    when the target is not on the target-stack, if the target_can_run
 577    routine returns 1; in that case, it must push itself onto the stack.
 578    Upon exit, the target should be ready for normal operations, and
 579    should be ready to deliver the status of the process immediately
 580    (without waiting) to an upcoming target_wait call.  */
 581
 582 void target_attach (char *, int);
 583
 584 /* Some targets don't generate traps when attaching to the inferior,
 585    or their target_attach implementation takes care of the waiting.
 586    These targets must set to_attach_no_wait.  */
 587
 588 #define target_attach_no_wait \
 589      (current_target.to_attach_no_wait)
 590
 591 /* The target_attach operation places a process under debugger control,
 592    and stops the process.
 593
 594    This operation provides a target-specific hook that allows the
 595    necessary bookkeeping to be performed after an attach completes.  */
 596 #define target_post_attach(pid) \
 597      (*current_target.to_post_attach) (pid)
 598
 599 /* Takes a program previously attached to and detaches it.
 600    The program may resume execution (some targets do, some don't) and will
 601    no longer stop on signals, etc.  We better not have left any breakpoints
 602    in the program or it'll die when it hits one.  ARGS is arguments
 603    typed by the user (e.g. a signal to send the process).  FROM_TTY
 604    says whether to be verbose or not.  */
 605
 606 extern void target_detach (char *, int);
 607
 608 /* Disconnect from the current target without resuming it (leaving it
 609    waiting for a debugger).  */
 610
 611 extern void target_disconnect (char *, int);
 612
 613 /* Resume execution of the target process PTID.  STEP says whether to
 614    single-step or to run free; SIGGNAL is the signal to be given to
 615    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 616    pass TARGET_SIGNAL_DEFAULT.  */
 617
 618 extern void target_resume (ptid_t ptid, int step, enum target_signal signal);
 619
 620 /* Wait for process pid to do something.  PTID = -1 to wait for any
 621    pid to do something.  Return pid of child, or -1 in case of error;
 622    store status through argument pointer STATUS.  Note that it is
 623    _NOT_ OK to throw_exception() out of target_wait() without popping
 624    the debugging target from the stack; GDB isn't prepared to get back
 625    to the prompt with a debugging target but without the frame cache,
 626    stop_pc, etc., set up.  */
 627
 628 #define target_wait(ptid, status)               \
 629      (*current_target.to_wait) (ptid, status)
 630
 631 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 632
 633 #define target_fetch_registers(regcache, regno) \
 634      (*current_target.to_fetch_registers) (regcache, regno)
 635
 636 /* Store at least register REGNO, or all regs if REGNO == -1.
 637    It can store as many registers as it wants to, so target_prepare_to_store
 638    must have been previously called.  Calls error() if there are problems.  */
 639
 640 #define target_store_registers(regcache, regs)  \
 641      (*current_target.to_store_registers) (regcache, regs)
 642
 643 /* Get ready to modify the registers array.  On machines which store
 644    individual registers, this doesn't need to do anything.  On machines
 645    which store all the registers in one fell swoop, this makes sure
 646    that REGISTERS contains all the registers from the program being
 647    debugged.  */
 648
 649 #define target_prepare_to_store(regcache)       \
 650      (*current_target.to_prepare_to_store) (regcache)
 651
 652 /* Returns true if this target can debug multiple processes
 653    simultaneously.  */
 654
 655 #define target_supports_multi_process() \
 656      (*current_target.to_supports_multi_process) ()
 657
 658 extern DCACHE *target_dcache;
 659
 660 extern int target_read_string (CORE_ADDR, char **, int, int *);
 661
 662 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 663
 664 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 665                                 int len);
 666
 667 extern int xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 668                         struct mem_attrib *, struct target_ops *);
 669
 670 /* Fetches the target's memory map.  If one is found it is sorted
 671    and returned, after some consistency checking.  Otherwise, NULL
 672    is returned.  */
 673 VEC(mem_region_s) *target_memory_map (void);
 674
 675 /* Erase the specified flash region.  */
 676 void target_flash_erase (ULONGEST address, LONGEST length);
 677
 678 /* Finish a sequence of flash operations.  */
 679 void target_flash_done (void);
 680
 681 /* Describes a request for a memory write operation.  */
 682 struct memory_write_request
 683   {
 684     /* Begining address that must be written. */
 685     ULONGEST begin;
 686     /* Past-the-end address. */
 687     ULONGEST end;
 688     /* The data to write. */
 689     gdb_byte *data;
 690     /* A callback baton for progress reporting for this request.  */
 691     void *baton;
 692   };
 693 typedef struct memory_write_request memory_write_request_s;
 694 DEF_VEC_O(memory_write_request_s);
 695
 696 /* Enumeration specifying different flash preservation behaviour.  */
 697 enum flash_preserve_mode
 698   {
 699     flash_preserve,
 700     flash_discard
 701   };
 702
 703 /* Write several memory blocks at once.  This version can be more
 704    efficient than making several calls to target_write_memory, in
 705    particular because it can optimize accesses to flash memory.
 706
 707    Moreover, this is currently the only memory access function in gdb
 708    that supports writing to flash memory, and it should be used for
 709    all cases where access to flash memory is desirable.
 710
 711    REQUESTS is the vector (see vec.h) of memory_write_request.
 712    PRESERVE_FLASH_P indicates what to do with blocks which must be
 713      erased, but not completely rewritten.
 714    PROGRESS_CB is a function that will be periodically called to provide
 715      feedback to user.  It will be called with the baton corresponding
 716      to the request currently being written.  It may also be called
 717      with a NULL baton, when preserved flash sectors are being rewritten.
 718
 719    The function returns 0 on success, and error otherwise.  */
 720 int target_write_memory_blocks (VEC(memory_write_request_s) *requests,
 721                                 enum flash_preserve_mode preserve_flash_p,
 722                                 void (*progress_cb) (ULONGEST, void *));
 723
 724 /* From infrun.c.  */
 725
 726 extern int inferior_has_forked (ptid_t pid, ptid_t *child_pid);
 727
 728 extern int inferior_has_vforked (ptid_t pid, ptid_t *child_pid);
 729
 730 extern int inferior_has_execd (ptid_t pid, char **execd_pathname);
 731
 732 /* From exec.c */
 733
 734 extern void print_section_info (struct target_ops *, bfd *);
 735
 736 /* Print a line about the current target.  */
 737
 738 #define target_files_info()     \
 739      (*current_target.to_files_info) (&current_target)
 740
 741 /* Insert a breakpoint at address BP_TGT->placed_address in the target
 742    machine.  Result is 0 for success, or an errno value.  */
 743
 744 #define target_insert_breakpoint(bp_tgt)        \
 745      (*current_target.to_insert_breakpoint) (bp_tgt)
 746
 747 /* Remove a breakpoint at address BP_TGT->placed_address in the target
 748    machine.  Result is 0 for success, or an errno value.  */
 749
 750 #define target_remove_breakpoint(bp_tgt)        \
 751      (*current_target.to_remove_breakpoint) (bp_tgt)
 752
 753 /* Initialize the terminal settings we record for the inferior,
 754    before we actually run the inferior.  */
 755
 756 #define target_terminal_init() \
 757      (*current_target.to_terminal_init) ()
 758
 759 /* Put the inferior's terminal settings into effect.
 760    This is preparation for starting or resuming the inferior.  */
 761
 762 #define target_terminal_inferior() \
 763      (*current_target.to_terminal_inferior) ()
 764
 765 /* Put some of our terminal settings into effect,
 766    enough to get proper results from our output,
 767    but do not change into or out of RAW mode
 768    so that no input is discarded.
 769
 770    After doing this, either terminal_ours or terminal_inferior
 771    should be called to get back to a normal state of affairs.  */
 772
 773 #define target_terminal_ours_for_output() \
 774      (*current_target.to_terminal_ours_for_output) ()
 775
 776 /* Put our terminal settings into effect.
 777    First record the inferior's terminal settings
 778    so they can be restored properly later.  */
 779
 780 #define target_terminal_ours() \
 781      (*current_target.to_terminal_ours) ()
 782
 783 /* Save our terminal settings.
 784    This is called from TUI after entering or leaving the curses
 785    mode.  Since curses modifies our terminal this call is here
 786    to take this change into account.  */
 787
 788 #define target_terminal_save_ours() \
 789      (*current_target.to_terminal_save_ours) ()
 790
 791 /* Print useful information about our terminal status, if such a thing
 792    exists.  */
 793
 794 #define target_terminal_info(arg, from_tty) \
 795      (*current_target.to_terminal_info) (arg, from_tty)
 796
 797 /* Kill the inferior process.   Make it go away.  */
 798
 799 #define target_kill() \
 800      (*current_target.to_kill) ()
 801
 802 /* Load an executable file into the target process.  This is expected
 803    to not only bring new code into the target process, but also to
 804    update GDB's symbol tables to match.
 805
 806    ARG contains command-line arguments, to be broken down with
 807    buildargv ().  The first non-switch argument is the filename to
 808    load, FILE; the second is a number (as parsed by strtoul (..., ...,
 809    0)), which is an offset to apply to the load addresses of FILE's
 810    sections.  The target may define switches, or other non-switch
 811    arguments, as it pleases.  */
 812
 813 extern void target_load (char *arg, int from_tty);
 814
 815 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 816    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 817    symbol should be returned.  The result is 0 if successful, nonzero
 818    if the symbol does not exist in the target environment.  This
 819    function should not call error() if communication with the target
 820    is interrupted, since it is called from symbol reading, but should
 821    return nonzero, possibly doing a complain().  */
 822
 823 #define target_lookup_symbol(name, addrp) \
 824      (*current_target.to_lookup_symbol) (name, addrp)
 825
 826 /* Start an inferior process and set inferior_ptid to its pid.
 827    EXEC_FILE is the file to run.
 828    ALLARGS is a string containing the arguments to the program.
 829    ENV is the environment vector to pass.  Errors reported with error().
 830    On VxWorks and various standalone systems, we ignore exec_file.  */
 831
 832 void target_create_inferior (char *exec_file, char *args,
 833                              char **env, int from_tty);
 834
 835 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 836    notification of inferior events such as fork and vork immediately
 837    after the inferior is created.  (This because of how gdb gets an
 838    inferior created via invoking a shell to do it.  In such a scenario,
 839    if the shell init file has commands in it, the shell will fork and
 840    exec for each of those commands, and we will see each such fork
 841    event.  Very bad.)
 842
 843    Such targets will supply an appropriate definition for this function.  */
 844
 845 #define target_post_startup_inferior(ptid) \
 846      (*current_target.to_post_startup_inferior) (ptid)
 847
 848 /* On some targets, the sequence of starting up an inferior requires
 849    some synchronization between gdb and the new inferior process, PID.  */
 850
 851 #define target_acknowledge_created_inferior(pid) \
 852      (*current_target.to_acknowledge_created_inferior) (pid)
 853
 854 /* On some targets, we can catch an inferior fork or vfork event when
 855    it occurs.  These functions insert/remove an already-created
 856    catchpoint for such events.  */
 857
 858 #define target_insert_fork_catchpoint(pid) \
 859      (*current_target.to_insert_fork_catchpoint) (pid)
 860
 861 #define target_remove_fork_catchpoint(pid) \
 862      (*current_target.to_remove_fork_catchpoint) (pid)
 863
 864 #define target_insert_vfork_catchpoint(pid) \
 865      (*current_target.to_insert_vfork_catchpoint) (pid)
 866
 867 #define target_remove_vfork_catchpoint(pid) \
 868      (*current_target.to_remove_vfork_catchpoint) (pid)
 869
 870 /* If the inferior forks or vforks, this function will be called at
 871    the next resume in order to perform any bookkeeping and fiddling
 872    necessary to continue debugging either the parent or child, as
 873    requested, and releasing the other.  Information about the fork
 874    or vfork event is available via get_last_target_status ().
 875    This function returns 1 if the inferior should not be resumed
 876    (i.e. there is another event pending).  */
 877
 878 int target_follow_fork (int follow_child);
 879
 880 /* On some targets, we can catch an inferior exec event when it
 881    occurs.  These functions insert/remove an already-created
 882    catchpoint for such events.  */
 883
 884 #define target_insert_exec_catchpoint(pid) \
 885      (*current_target.to_insert_exec_catchpoint) (pid)
 886
 887 #define target_remove_exec_catchpoint(pid) \
 888      (*current_target.to_remove_exec_catchpoint) (pid)
 889
 890 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 891    exit code of PID, if any.  */
 892
 893 #define target_has_exited(pid,wait_status,exit_status) \
 894      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 895
 896 /* The debugger has completed a blocking wait() call.  There is now
 897    some process event that must be processed.  This function should
 898    be defined by those targets that require the debugger to perform
 899    cleanup or internal state changes in response to the process event.  */
 900
 901 /* The inferior process has died.  Do what is right.  */
 902
 903 void target_mourn_inferior (void);
 904
 905 /* Does target have enough data to do a run or attach command? */
 906
 907 #define target_can_run(t) \
 908      ((t)->to_can_run) ()
 909
 910 /* post process changes to signal handling in the inferior.  */
 911
 912 #define target_notice_signals(ptid) \
 913      (*current_target.to_notice_signals) (ptid)
 914
 915 /* Check to see if a thread is still alive.  */
 916
 917 #define target_thread_alive(ptid) \
 918      (*current_target.to_thread_alive) (ptid)
 919
 920 /* Query for new threads and add them to the thread list.  */
 921
 922 #define target_find_new_threads() \
 923      (*current_target.to_find_new_threads) ()
 924
 925 /* Make target stop in a continuable fashion.  (For instance, under
 926    Unix, this should act like SIGSTOP).  This function is normally
 927    used by GUIs to implement a stop button.  */
 928
 929 #define target_stop(ptid) (*current_target.to_stop) (ptid)
 930
 931 /* Send the specified COMMAND to the target's monitor
 932    (shell,interpreter) for execution.  The result of the query is
 933    placed in OUTBUF.  */
 934
 935 #define target_rcmd(command, outbuf) \
 936      (*current_target.to_rcmd) (command, outbuf)
 937
 938
 939 /* Does the target include all of memory, or only part of it?  This
 940    determines whether we look up the target chain for other parts of
 941    memory if this target can't satisfy a request.  */
 942
 943 #define target_has_all_memory   \
 944      (current_target.to_has_all_memory)
 945
 946 /* Does the target include memory?  (Dummy targets don't.)  */
 947
 948 #define target_has_memory       \
 949      (current_target.to_has_memory)
 950
 951 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 952    we start a process.)  */
 953
 954 #define target_has_stack        \
 955      (current_target.to_has_stack)
 956
 957 /* Does the target have registers?  (Exec files don't.)  */
 958
 959 #define target_has_registers    \
 960      (current_target.to_has_registers)
 961
 962 /* Does the target have execution?  Can we make it jump (through
 963    hoops), or pop its stack a few times?  This means that the current
 964    target is currently executing; for some targets, that's the same as
 965    whether or not the target is capable of execution, but there are
 966    also targets which can be current while not executing.  In that
 967    case this will become true after target_create_inferior or
 968    target_attach.  */
 969
 970 #define target_has_execution    \
 971      (current_target.to_has_execution)
 972
 973 /* Can the target support the debugger control of thread execution?
 974    Can it lock the thread scheduler?  */
 975
 976 #define target_can_lock_scheduler \
 977      (current_target.to_has_thread_control & tc_schedlock)
 978
 979 /* Should the target enable async mode if it is supported?  Temporary
 980    cludge until async mode is a strict superset of sync mode.  */
 981 extern int target_async_permitted;
 982
 983 /* Can the target support asynchronous execution? */
 984 #define target_can_async_p() (current_target.to_can_async_p ())
 985
 986 /* Is the target in asynchronous execution mode? */
 987 #define target_is_async_p() (current_target.to_is_async_p ())
 988
 989 int target_supports_non_stop (void);
 990
 991 /* Put the target in async mode with the specified callback function. */
 992 #define target_async(CALLBACK,CONTEXT) \
 993      (current_target.to_async ((CALLBACK), (CONTEXT)))
 994
 995 /* This is to be used ONLY within call_function_by_hand(). It provides
 996    a workaround, to have inferior function calls done in sychronous
 997    mode, even though the target is asynchronous. After
 998    target_async_mask(0) is called, calls to target_can_async_p() will
 999    return FALSE , so that target_resume() will not try to start the
1000    target asynchronously. After the inferior stops, we IMMEDIATELY
1001    restore the previous nature of the target, by calling
1002    target_async_mask(1). After that, target_can_async_p() will return
1003    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
1004
1005    FIXME ezannoni 1999-12-13: we won't need this once we move
1006    the turning async on and off to the single execution commands,
1007    from where it is done currently, in remote_resume().  */
1008
1009 #define target_async_mask(MASK) \
1010   (current_target.to_async_mask (MASK))
1011
1012 /* Converts a process id to a string.  Usually, the string just contains
1013    `process xyz', but on some systems it may contain
1014    `process xyz thread abc'.  */
1015
1016 #undef target_pid_to_str
1017 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
1018
1019 extern char *normal_pid_to_str (ptid_t ptid);
1020
1021 /* Return a short string describing extra information about PID,
1022    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
1023    is okay.  */
1024
1025 #define target_extra_thread_info(TP) \
1026      (current_target.to_extra_thread_info (TP))
1027
1028 /* Attempts to find the pathname of the executable file
1029    that was run to create a specified process.
1030
1031    The process PID must be stopped when this operation is used.
1032
1033    If the executable file cannot be determined, NULL is returned.
1034
1035    Else, a pointer to a character string containing the pathname
1036    is returned.  This string should be copied into a buffer by
1037    the client if the string will not be immediately used, or if
1038    it must persist.  */
1039
1040 #define target_pid_to_exec_file(pid) \
1041      (current_target.to_pid_to_exec_file) (pid)
1042
1043 /*
1044  * Iterator function for target memory regions.
1045  * Calls a callback function once for each memory region 'mapped'
1046  * in the child process.  Defined as a simple macro rather than
1047  * as a function macro so that it can be tested for nullity.
1048  */
1049
1050 #define target_find_memory_regions(FUNC, DATA) \
1051      (current_target.to_find_memory_regions) (FUNC, DATA)
1052
1053 /*
1054  * Compose corefile .note section.
1055  */
1056
1057 #define target_make_corefile_notes(BFD, SIZE_P) \
1058      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1059
1060 /* Thread-local values.  */
1061 #define target_get_thread_local_address \
1062     (current_target.to_get_thread_local_address)
1063 #define target_get_thread_local_address_p() \
1064     (target_get_thread_local_address != NULL)
1065
1066
1067 /* Hardware watchpoint interfaces.  */
1068
1069 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1070    write).  */
1071
1072 #ifndef STOPPED_BY_WATCHPOINT
1073 #define STOPPED_BY_WATCHPOINT(w) \
1074    (*current_target.to_stopped_by_watchpoint) ()
1075 #endif
1076
1077 /* Non-zero if we have steppable watchpoints  */
1078
1079 #ifndef HAVE_STEPPABLE_WATCHPOINT
1080 #define HAVE_STEPPABLE_WATCHPOINT \
1081    (current_target.to_have_steppable_watchpoint)
1082 #endif
1083
1084 /* Non-zero if we have continuable watchpoints  */
1085
1086 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1087 #define HAVE_CONTINUABLE_WATCHPOINT \
1088    (current_target.to_have_continuable_watchpoint)
1089 #endif
1090
1091 /* Provide defaults for hardware watchpoint functions.  */
1092
1093 /* If the *_hw_beakpoint functions have not been defined
1094    elsewhere use the definitions in the target vector.  */
1095
1096 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1097    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1098    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1099    (including this one?).  OTHERTYPE is who knows what...  */
1100
1101 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1102 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1103  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1104 #endif
1105
1106 #ifndef TARGET_REGION_OK_FOR_HW_WATCHPOINT
1107 #define TARGET_REGION_OK_FOR_HW_WATCHPOINT(addr, len) \
1108     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1109 #endif
1110
1111
1112 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1113    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1114    success, non-zero for failure.  */
1115
1116 #ifndef target_insert_watchpoint
1117 #define target_insert_watchpoint(addr, len, type)       \
1118      (*current_target.to_insert_watchpoint) (addr, len, type)
1119
1120 #define target_remove_watchpoint(addr, len, type)       \
1121      (*current_target.to_remove_watchpoint) (addr, len, type)
1122 #endif
1123
1124 #ifndef target_insert_hw_breakpoint
1125 #define target_insert_hw_breakpoint(bp_tgt) \
1126      (*current_target.to_insert_hw_breakpoint) (bp_tgt)
1127
1128 #define target_remove_hw_breakpoint(bp_tgt) \
1129      (*current_target.to_remove_hw_breakpoint) (bp_tgt)
1130 #endif
1131
1132 extern int target_stopped_data_address_p (struct target_ops *);
1133
1134 #ifndef target_stopped_data_address
1135 #define target_stopped_data_address(target, x) \
1136     (*target.to_stopped_data_address) (target, x)
1137 #else
1138 /* Horrible hack to get around existing macros :-(.  */
1139 #define target_stopped_data_address_p(CURRENT_TARGET) (1)
1140 #endif
1141
1142 #define target_watchpoint_addr_within_range(target, addr, start, length) \
1143   (*target.to_watchpoint_addr_within_range) (target, addr, start, length)
1144
1145 /* Target can execute in reverse?  */
1146 #define target_can_execute_reverse \
1147      (current_target.to_can_execute_reverse ? \
1148       current_target.to_can_execute_reverse () : 0)
1149
1150 extern const struct target_desc *target_read_description (struct target_ops *);
1151
1152 #define target_get_ada_task_ptid(lwp, tid) \
1153      (*current_target.to_get_ada_task_ptid) (lwp,tid)
1154
1155 /* Utility implementation of searching memory.  */
1156 extern int simple_search_memory (struct target_ops* ops,
1157                                  CORE_ADDR start_addr,
1158                                  ULONGEST search_space_len,
1159                                  const gdb_byte *pattern,
1160                                  ULONGEST pattern_len,
1161                                  CORE_ADDR *found_addrp);
1162
1163 /* Main entry point for searching memory.  */
1164 extern int target_search_memory (CORE_ADDR start_addr,
1165                                  ULONGEST search_space_len,
1166                                  const gdb_byte *pattern,
1167                                  ULONGEST pattern_len,
1168                                  CORE_ADDR *found_addrp);
1169
1170 /* Command logging facility.  */
1171
1172 #define target_log_command(p)                                           \
1173   do                                                                    \
1174     if (current_target.to_log_command)                                  \
1175       (*current_target.to_log_command) (p);                             \
1176   while (0)
1177
1178 /* Routines for maintenance of the target structures...
1179
1180    add_target:   Add a target to the list of all possible targets.
1181
1182    push_target:  Make this target the top of the stack of currently used
1183    targets, within its particular stratum of the stack.  Result
1184    is 0 if now atop the stack, nonzero if not on top (maybe
1185    should warn user).
1186
1187    unpush_target: Remove this from the stack of currently used targets,
1188    no matter where it is on the list.  Returns 0 if no
1189    change, 1 if removed from stack.
1190
1191    pop_target:   Remove the top thing on the stack of current targets.  */
1192
1193 extern void add_target (struct target_ops *);
1194
1195 extern int push_target (struct target_ops *);
1196
1197 extern int unpush_target (struct target_ops *);
1198
1199 extern void target_pre_inferior (int);
1200
1201 extern void target_preopen (int);
1202
1203 extern void pop_target (void);
1204
1205 /* Does whatever cleanup is required to get rid of all pushed targets.
1206    QUITTING is propagated to target_close; it indicates that GDB is
1207    exiting and should not get hung on an error (otherwise it is
1208    important to perform clean termination, even if it takes a
1209    while).  */
1210 extern void pop_all_targets (int quitting);
1211
1212 /* Like pop_all_targets, but pops only targets whose stratum is
1213    strictly above ABOVE_STRATUM.  */
1214 extern void pop_all_targets_above (enum strata above_stratum, int quitting);
1215
1216 extern CORE_ADDR target_translate_tls_address (struct objfile *objfile,
1217                                                CORE_ADDR offset);
1218
1219 /* Mark a pushed target as running or exited, for targets which do not
1220    automatically pop when not active.  */
1221
1222 void target_mark_running (struct target_ops *);
1223
1224 void target_mark_exited (struct target_ops *);
1225
1226 /* Struct section_table maps address ranges to file sections.  It is
1227    mostly used with BFD files, but can be used without (e.g. for handling
1228    raw disks, or files not in formats handled by BFD).  */
1229
1230 struct section_table
1231   {
1232     CORE_ADDR addr;             /* Lowest address in section */
1233     CORE_ADDR endaddr;          /* 1+highest address in section */
1234
1235     struct bfd_section *the_bfd_section;
1236
1237     bfd *bfd;                   /* BFD file pointer */
1238   };
1239
1240 /* Return the "section" containing the specified address.  */
1241 struct section_table *target_section_by_addr (struct target_ops *target,
1242                                               CORE_ADDR addr);
1243
1244
1245 /* From mem-break.c */
1246
1247 extern int memory_remove_breakpoint (struct bp_target_info *);
1248
1249 extern int memory_insert_breakpoint (struct bp_target_info *);
1250
1251 extern int default_memory_remove_breakpoint (struct gdbarch *, struct bp_target_info *);
1252
1253 extern int default_memory_insert_breakpoint (struct gdbarch *, struct bp_target_info *);
1254
1255
1256 /* From target.c */
1257
1258 extern void initialize_targets (void);
1259
1260 extern void noprocess (void);
1261
1262 extern void target_require_runnable (void);
1263
1264 extern void find_default_attach (struct target_ops *, char *, int);
1265
1266 extern void find_default_create_inferior (struct target_ops *,
1267                                           char *, char *, char **, int);
1268
1269 extern struct target_ops *find_run_target (void);
1270
1271 extern struct target_ops *find_core_target (void);
1272
1273 extern struct target_ops *find_target_beneath (struct target_ops *);
1274
1275 extern int target_resize_to_sections (struct target_ops *target,
1276                                       int num_added);
1277
1278 extern void remove_target_sections (bfd *abfd);
1279
1280 /* Read OS data object of type TYPE from the target, and return it in
1281    XML format.  The result is NUL-terminated and returned as a string,
1282    allocated using xmalloc.  If an error occurs or the transfer is
1283    unsupported, NULL is returned.  Empty objects are returned as
1284    allocated but empty strings.  */
1285
1286 extern char *target_get_osdata (const char *type);
1287
1288 \f
1289 /* Stuff that should be shared among the various remote targets.  */
1290
1291 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1292    information (higher values, more information).  */
1293 extern int remote_debug;
1294
1295 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1296 extern int baud_rate;
1297 /* Timeout limit for response from target. */
1298 extern int remote_timeout;
1299
1300 \f
1301 /* Functions for helping to write a native target.  */
1302
1303 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1304 extern void store_waitstatus (struct target_waitstatus *, int);
1305
1306 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1307    targ_signal SIGNO has an equivalent ``host'' representation.  */
1308 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1309    to the shorter target_signal_p() because it is far less ambigious.
1310    In this context ``target_signal'' refers to GDB's internal
1311    representation of the target's set of signals while ``host signal''
1312    refers to the target operating system's signal.  Confused?  */
1313
1314 extern int target_signal_to_host_p (enum target_signal signo);
1315
1316 /* Convert between host signal numbers and enum target_signal's.
1317    target_signal_to_host() returns 0 and prints a warning() on GDB's
1318    console if SIGNO has no equivalent host representation.  */
1319 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1320    refering to the target operating system's signal numbering.
1321    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1322    gdb_signal'' would probably be better as it is refering to GDB's
1323    internal representation of a target operating system's signal.  */
1324
1325 extern enum target_signal target_signal_from_host (int);
1326 extern int target_signal_to_host (enum target_signal);
1327
1328 extern enum target_signal default_target_signal_from_host (struct gdbarch *,
1329                                                            int);
1330 extern int default_target_signal_to_host (struct gdbarch *,
1331                                           enum target_signal);
1332
1333 /* Convert from a number used in a GDB command to an enum target_signal.  */
1334 extern enum target_signal target_signal_from_command (int);
1335
1336 /* Set the show memory breakpoints mode to show, and installs a cleanup
1337    to restore it back to the current value.  */
1338 extern struct cleanup *make_show_memory_breakpoints_cleanup (int show);
1339
1340 \f
1341 /* Imported from machine dependent code */
1342
1343 /* Blank target vector entries are initialized to target_ignore. */
1344 void target_ignore (void);
1345
1346 extern struct target_ops deprecated_child_ops;
1347
1348 #endif /* !defined (TARGET_H) */