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