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' 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
 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         ptid_t 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) (ptid_t);
 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     int to_attach_no_wait;
 416     struct section_table
 417      *to_sections;
 418     struct section_table
 419      *to_sections_end;
 420     /* ASYNC target controls */
 421     int (*to_can_async_p) (void);
 422     int (*to_is_async_p) (void);
 423     void (*to_async) (void (*) (enum inferior_event_type, void *), void *);
 424     int (*to_async_mask) (int);
 425     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 426                                             unsigned long,
 427                                             int, int, int,
 428                                             void *),
 429                                    void *);
 430     char * (*to_make_corefile_notes) (bfd *, int *);
 431
 432     /* Return the thread-local address at OFFSET in the
 433        thread-local storage for the thread PTID and the shared library
 434        or executable file given by OBJFILE.  If that block of
 435        thread-local storage hasn't been allocated yet, this function
 436        may return an error.  */
 437     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 438                                               CORE_ADDR load_module_addr,
 439                                               CORE_ADDR offset);
 440
 441     /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 442        OBJECT.  The OFFSET, for a seekable object, specifies the
 443        starting point.  The ANNEX can be used to provide additional
 444        data-specific information to the target.
 445
 446        Return the number of bytes actually transfered, zero when no
 447        further transfer is possible, and -1 when the transfer is not
 448        supported.  Return of a positive value smaller than LEN does
 449        not indicate the end of the object, only the end of the
 450        transfer; higher level code should continue transferring if
 451        desired.  This is handled in target.c.
 452
 453        The interface does not support a "retry" mechanism.  Instead it
 454        assumes that at least one byte will be transfered on each
 455        successful call.
 456
 457        NOTE: cagney/2003-10-17: The current interface can lead to
 458        fragmented transfers.  Lower target levels should not implement
 459        hacks, such as enlarging the transfer, in an attempt to
 460        compensate for this.  Instead, the target stack should be
 461        extended so that it implements supply/collect methods and a
 462        look-aside object cache.  With that available, the lowest
 463        target can safely and freely "push" data up the stack.
 464
 465        See target_read and target_write for more information.  One,
 466        and only one, of readbuf or writebuf must be non-NULL.  */
 467
 468     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 469                                 enum target_object object, const char *annex,
 470                                 gdb_byte *readbuf, const gdb_byte *writebuf,
 471                                 ULONGEST offset, LONGEST len);
 472
 473     /* Returns the memory map for the target.  A return value of NULL
 474        means that no memory map is available.  If a memory address
 475        does not fall within any returned regions, it's assumed to be
 476        RAM.  The returned memory regions should not overlap.
 477
 478        The order of regions does not matter; target_memory_map will
 479        sort regions by starting address. For that reason, this
 480        function should not be called directly except via
 481        target_memory_map.
 482
 483        This method should not cache data; if the memory map could
 484        change unexpectedly, it should be invalidated, and higher
 485        layers will re-fetch it.  */
 486     VEC(mem_region_s) *(*to_memory_map) (struct target_ops *);
 487
 488     /* Erases the region of flash memory starting at ADDRESS, of
 489        length LENGTH.
 490
 491        Precondition: both ADDRESS and ADDRESS+LENGTH should be aligned
 492        on flash block boundaries, as reported by 'to_memory_map'.  */
 493     void (*to_flash_erase) (struct target_ops *,
 494                            ULONGEST address, LONGEST length);
 495
 496     /* Finishes a flash memory write sequence.  After this operation
 497        all flash memory should be available for writing and the result
 498        of reading from areas written by 'to_flash_write' should be
 499        equal to what was written.  */
 500     void (*to_flash_done) (struct target_ops *);
 501
 502     /* Describe the architecture-specific features of this target.
 503        Returns the description found, or NULL if no description
 504        was available.  */
 505     const struct target_desc *(*to_read_description) (struct target_ops *ops);
 506
 507     /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
 508        Return 0 if *READPTR is already at the end of the buffer.
 509        Return -1 if there is insufficient buffer for a whole entry.
 510        Return 1 if an entry was read into *TYPEP and *VALP.  */
 511     int (*to_auxv_parse) (struct target_ops *ops, gdb_byte **readptr,
 512                          gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp);
 513
 514     /* Search SEARCH_SPACE_LEN bytes beginning at START_ADDR for the
 515        sequence of bytes in PATTERN with length PATTERN_LEN.
 516
 517        The result is 1 if found, 0 if not found, and -1 if there was an error
 518        requiring halting of the search (e.g. memory read error).
 519        If the pattern is found the address is recorded in FOUND_ADDRP.  */
 520     int (*to_search_memory) (struct target_ops *ops,
 521                              CORE_ADDR start_addr, ULONGEST search_space_len,
 522                              const gdb_byte *pattern, ULONGEST pattern_len,
 523                              CORE_ADDR *found_addrp);
 524
 525     int to_magic;
 526     /* Need sub-structure for target machine related rather than comm related?
 527      */
 528   };
 529
 530 /* Magic number for checking ops size.  If a struct doesn't end with this
 531    number, somebody changed the declaration but didn't change all the
 532    places that initialize one.  */
 533
 534 #define OPS_MAGIC       3840
 535
 536 /* The ops structure for our "current" target process.  This should
 537    never be NULL.  If there is no target, it points to the dummy_target.  */
 538
 539 extern struct target_ops current_target;
 540
 541 /* Define easy words for doing these operations on our current target.  */
 542
 543 #define target_shortname        (current_target.to_shortname)
 544 #define target_longname         (current_target.to_longname)
 545
 546 /* Does whatever cleanup is required for a target that we are no
 547    longer going to be calling.  QUITTING indicates that GDB is exiting
 548    and should not get hung on an error (otherwise it is important to
 549    perform clean termination, even if it takes a while).  This routine
 550    is automatically always called when popping the target off the
 551    target stack (to_beneath is undefined).  Closing file descriptors
 552    and freeing all memory allocated memory are typical things it
 553    should do.  */
 554
 555 void target_close (struct target_ops *targ, int quitting);
 556
 557 /* Attaches to a process on the target side.  Arguments are as passed
 558    to the `attach' command by the user.  This routine can be called
 559    when the target is not on the target-stack, if the target_can_run
 560    routine returns 1; in that case, it must push itself onto the stack.
 561    Upon exit, the target should be ready for normal operations, and
 562    should be ready to deliver the status of the process immediately
 563    (without waiting) to an upcoming target_wait call.  */
 564
 565 #define target_attach(args, from_tty)   \
 566      (*current_target.to_attach) (args, from_tty)
 567
 568 /* Some targets don't generate traps when attaching to the inferior,
 569    or their target_attach implementation takes care of the waiting.
 570    These targets must set to_attach_no_wait.  */
 571
 572 #define target_attach_no_wait \
 573      (current_target.to_attach_no_wait)
 574
 575 /* The target_attach operation places a process under debugger control,
 576    and stops the process.
 577
 578    This operation provides a target-specific hook that allows the
 579    necessary bookkeeping to be performed after an attach completes.  */
 580 #define target_post_attach(pid) \
 581      (*current_target.to_post_attach) (pid)
 582
 583 /* Takes a program previously attached to and detaches it.
 584    The program may resume execution (some targets do, some don't) and will
 585    no longer stop on signals, etc.  We better not have left any breakpoints
 586    in the program or it'll die when it hits one.  ARGS is arguments
 587    typed by the user (e.g. a signal to send the process).  FROM_TTY
 588    says whether to be verbose or not.  */
 589
 590 extern void target_detach (char *, int);
 591
 592 /* Disconnect from the current target without resuming it (leaving it
 593    waiting for a debugger).  */
 594
 595 extern void target_disconnect (char *, int);
 596
 597 /* Resume execution of the target process PTID.  STEP says whether to
 598    single-step or to run free; SIGGNAL is the signal to be given to
 599    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 600    pass TARGET_SIGNAL_DEFAULT.  */
 601
 602 extern void target_resume (ptid_t ptid, int step, enum target_signal signal);
 603
 604 /* Wait for process pid to do something.  PTID = -1 to wait for any
 605    pid to do something.  Return pid of child, or -1 in case of error;
 606    store status through argument pointer STATUS.  Note that it is
 607    _NOT_ OK to throw_exception() out of target_wait() without popping
 608    the debugging target from the stack; GDB isn't prepared to get back
 609    to the prompt with a debugging target but without the frame cache,
 610    stop_pc, etc., set up.  */
 611
 612 #define target_wait(ptid, status)               \
 613      (*current_target.to_wait) (ptid, status)
 614
 615 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 616
 617 #define target_fetch_registers(regcache, regno) \
 618      (*current_target.to_fetch_registers) (regcache, regno)
 619
 620 /* Store at least register REGNO, or all regs if REGNO == -1.
 621    It can store as many registers as it wants to, so target_prepare_to_store
 622    must have been previously called.  Calls error() if there are problems.  */
 623
 624 #define target_store_registers(regcache, regs)  \
 625      (*current_target.to_store_registers) (regcache, regs)
 626
 627 /* Get ready to modify the registers array.  On machines which store
 628    individual registers, this doesn't need to do anything.  On machines
 629    which store all the registers in one fell swoop, this makes sure
 630    that REGISTERS contains all the registers from the program being
 631    debugged.  */
 632
 633 #define target_prepare_to_store(regcache)       \
 634      (*current_target.to_prepare_to_store) (regcache)
 635
 636 extern DCACHE *target_dcache;
 637
 638 extern int target_read_string (CORE_ADDR, char **, int, int *);
 639
 640 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 641
 642 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 643                                 int len);
 644
 645 extern int xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 646                         struct mem_attrib *, struct target_ops *);
 647
 648 /* Fetches the target's memory map.  If one is found it is sorted
 649    and returned, after some consistency checking.  Otherwise, NULL
 650    is returned.  */
 651 VEC(mem_region_s) *target_memory_map (void);
 652
 653 /* Erase the specified flash region.  */
 654 void target_flash_erase (ULONGEST address, LONGEST length);
 655
 656 /* Finish a sequence of flash operations.  */
 657 void target_flash_done (void);
 658
 659 /* Describes a request for a memory write operation.  */
 660 struct memory_write_request
 661   {
 662     /* Begining address that must be written. */
 663     ULONGEST begin;
 664     /* Past-the-end address. */
 665     ULONGEST end;
 666     /* The data to write. */
 667     gdb_byte *data;
 668     /* A callback baton for progress reporting for this request.  */
 669     void *baton;
 670   };
 671 typedef struct memory_write_request memory_write_request_s;
 672 DEF_VEC_O(memory_write_request_s);
 673
 674 /* Enumeration specifying different flash preservation behaviour.  */
 675 enum flash_preserve_mode
 676   {
 677     flash_preserve,
 678     flash_discard
 679   };
 680
 681 /* Write several memory blocks at once.  This version can be more
 682    efficient than making several calls to target_write_memory, in
 683    particular because it can optimize accesses to flash memory.
 684
 685    Moreover, this is currently the only memory access function in gdb
 686    that supports writing to flash memory, and it should be used for
 687    all cases where access to flash memory is desirable.
 688
 689    REQUESTS is the vector (see vec.h) of memory_write_request.
 690    PRESERVE_FLASH_P indicates what to do with blocks which must be
 691      erased, but not completely rewritten.
 692    PROGRESS_CB is a function that will be periodically called to provide
 693      feedback to user.  It will be called with the baton corresponding
 694      to the request currently being written.  It may also be called
 695      with a NULL baton, when preserved flash sectors are being rewritten.
 696
 697    The function returns 0 on success, and error otherwise.  */
 698 int target_write_memory_blocks (VEC(memory_write_request_s) *requests,
 699                                 enum flash_preserve_mode preserve_flash_p,
 700                                 void (*progress_cb) (ULONGEST, void *));
 701
 702 /* From infrun.c.  */
 703
 704 extern int inferior_has_forked (ptid_t pid, ptid_t *child_pid);
 705
 706 extern int inferior_has_vforked (ptid_t pid, ptid_t *child_pid);
 707
 708 extern int inferior_has_execd (ptid_t pid, char **execd_pathname);
 709
 710 /* From exec.c */
 711
 712 extern void print_section_info (struct target_ops *, bfd *);
 713
 714 /* Print a line about the current target.  */
 715
 716 #define target_files_info()     \
 717      (*current_target.to_files_info) (&current_target)
 718
 719 /* Insert a breakpoint at address BP_TGT->placed_address in the target
 720    machine.  Result is 0 for success, or an errno value.  */
 721
 722 #define target_insert_breakpoint(bp_tgt)        \
 723      (*current_target.to_insert_breakpoint) (bp_tgt)
 724
 725 /* Remove a breakpoint at address BP_TGT->placed_address in the target
 726    machine.  Result is 0 for success, or an errno value.  */
 727
 728 #define target_remove_breakpoint(bp_tgt)        \
 729      (*current_target.to_remove_breakpoint) (bp_tgt)
 730
 731 /* Initialize the terminal settings we record for the inferior,
 732    before we actually run the inferior.  */
 733
 734 #define target_terminal_init() \
 735      (*current_target.to_terminal_init) ()
 736
 737 /* Put the inferior's terminal settings into effect.
 738    This is preparation for starting or resuming the inferior.  */
 739
 740 #define target_terminal_inferior() \
 741      (*current_target.to_terminal_inferior) ()
 742
 743 /* Put some of our terminal settings into effect,
 744    enough to get proper results from our output,
 745    but do not change into or out of RAW mode
 746    so that no input is discarded.
 747
 748    After doing this, either terminal_ours or terminal_inferior
 749    should be called to get back to a normal state of affairs.  */
 750
 751 #define target_terminal_ours_for_output() \
 752      (*current_target.to_terminal_ours_for_output) ()
 753
 754 /* Put our terminal settings into effect.
 755    First record the inferior's terminal settings
 756    so they can be restored properly later.  */
 757
 758 #define target_terminal_ours() \
 759      (*current_target.to_terminal_ours) ()
 760
 761 /* Save our terminal settings.
 762    This is called from TUI after entering or leaving the curses
 763    mode.  Since curses modifies our terminal this call is here
 764    to take this change into account.  */
 765
 766 #define target_terminal_save_ours() \
 767      (*current_target.to_terminal_save_ours) ()
 768
 769 /* Print useful information about our terminal status, if such a thing
 770    exists.  */
 771
 772 #define target_terminal_info(arg, from_tty) \
 773      (*current_target.to_terminal_info) (arg, from_tty)
 774
 775 /* Kill the inferior process.   Make it go away.  */
 776
 777 #define target_kill() \
 778      (*current_target.to_kill) ()
 779
 780 /* Load an executable file into the target process.  This is expected
 781    to not only bring new code into the target process, but also to
 782    update GDB's symbol tables to match.
 783
 784    ARG contains command-line arguments, to be broken down with
 785    buildargv ().  The first non-switch argument is the filename to
 786    load, FILE; the second is a number (as parsed by strtoul (..., ...,
 787    0)), which is an offset to apply to the load addresses of FILE's
 788    sections.  The target may define switches, or other non-switch
 789    arguments, as it pleases.  */
 790
 791 extern void target_load (char *arg, int from_tty);
 792
 793 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 794    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 795    symbol should be returned.  The result is 0 if successful, nonzero
 796    if the symbol does not exist in the target environment.  This
 797    function should not call error() if communication with the target
 798    is interrupted, since it is called from symbol reading, but should
 799    return nonzero, possibly doing a complain().  */
 800
 801 #define target_lookup_symbol(name, addrp) \
 802      (*current_target.to_lookup_symbol) (name, addrp)
 803
 804 /* Start an inferior process and set inferior_ptid to its pid.
 805    EXEC_FILE is the file to run.
 806    ALLARGS is a string containing the arguments to the program.
 807    ENV is the environment vector to pass.  Errors reported with error().
 808    On VxWorks and various standalone systems, we ignore exec_file.  */
 809
 810 #define target_create_inferior(exec_file, args, env, FROM_TTY)  \
 811      (*current_target.to_create_inferior) (exec_file, args, env, (FROM_TTY))
 812
 813
 814 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 815    notification of inferior events such as fork and vork immediately
 816    after the inferior is created.  (This because of how gdb gets an
 817    inferior created via invoking a shell to do it.  In such a scenario,
 818    if the shell init file has commands in it, the shell will fork and
 819    exec for each of those commands, and we will see each such fork
 820    event.  Very bad.)
 821
 822    Such targets will supply an appropriate definition for this function.  */
 823
 824 #define target_post_startup_inferior(ptid) \
 825      (*current_target.to_post_startup_inferior) (ptid)
 826
 827 /* On some targets, the sequence of starting up an inferior requires
 828    some synchronization between gdb and the new inferior process, PID.  */
 829
 830 #define target_acknowledge_created_inferior(pid) \
 831      (*current_target.to_acknowledge_created_inferior) (pid)
 832
 833 /* On some targets, we can catch an inferior fork or vfork event when
 834    it occurs.  These functions insert/remove an already-created
 835    catchpoint for such events.  */
 836
 837 #define target_insert_fork_catchpoint(pid) \
 838      (*current_target.to_insert_fork_catchpoint) (pid)
 839
 840 #define target_remove_fork_catchpoint(pid) \
 841      (*current_target.to_remove_fork_catchpoint) (pid)
 842
 843 #define target_insert_vfork_catchpoint(pid) \
 844      (*current_target.to_insert_vfork_catchpoint) (pid)
 845
 846 #define target_remove_vfork_catchpoint(pid) \
 847      (*current_target.to_remove_vfork_catchpoint) (pid)
 848
 849 /* If the inferior forks or vforks, this function will be called at
 850    the next resume in order to perform any bookkeeping and fiddling
 851    necessary to continue debugging either the parent or child, as
 852    requested, and releasing the other.  Information about the fork
 853    or vfork event is available via get_last_target_status ().
 854    This function returns 1 if the inferior should not be resumed
 855    (i.e. there is another event pending).  */
 856
 857 int target_follow_fork (int follow_child);
 858
 859 /* On some targets, we can catch an inferior exec event when it
 860    occurs.  These functions insert/remove an already-created
 861    catchpoint for such events.  */
 862
 863 #define target_insert_exec_catchpoint(pid) \
 864      (*current_target.to_insert_exec_catchpoint) (pid)
 865
 866 #define target_remove_exec_catchpoint(pid) \
 867      (*current_target.to_remove_exec_catchpoint) (pid)
 868
 869 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 870    exit code of PID, if any.  */
 871
 872 #define target_has_exited(pid,wait_status,exit_status) \
 873      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 874
 875 /* The debugger has completed a blocking wait() call.  There is now
 876    some process event that must be processed.  This function should
 877    be defined by those targets that require the debugger to perform
 878    cleanup or internal state changes in response to the process event.  */
 879
 880 /* The inferior process has died.  Do what is right.  */
 881
 882 #define target_mourn_inferior() \
 883      (*current_target.to_mourn_inferior) ()
 884
 885 /* Does target have enough data to do a run or attach command? */
 886
 887 #define target_can_run(t) \
 888      ((t)->to_can_run) ()
 889
 890 /* post process changes to signal handling in the inferior.  */
 891
 892 #define target_notice_signals(ptid) \
 893      (*current_target.to_notice_signals) (ptid)
 894
 895 /* Check to see if a thread is still alive.  */
 896
 897 #define target_thread_alive(ptid) \
 898      (*current_target.to_thread_alive) (ptid)
 899
 900 /* Query for new threads and add them to the thread list.  */
 901
 902 #define target_find_new_threads() \
 903      (*current_target.to_find_new_threads) ()
 904
 905 /* Make target stop in a continuable fashion.  (For instance, under
 906    Unix, this should act like SIGSTOP).  This function is normally
 907    used by GUIs to implement a stop button.  */
 908
 909 #define target_stop(ptid) (*current_target.to_stop) (ptid)
 910
 911 /* Send the specified COMMAND to the target's monitor
 912    (shell,interpreter) for execution.  The result of the query is
 913    placed in OUTBUF.  */
 914
 915 #define target_rcmd(command, outbuf) \
 916      (*current_target.to_rcmd) (command, outbuf)
 917
 918
 919 /* Does the target include all of memory, or only part of it?  This
 920    determines whether we look up the target chain for other parts of
 921    memory if this target can't satisfy a request.  */
 922
 923 #define target_has_all_memory   \
 924      (current_target.to_has_all_memory)
 925
 926 /* Does the target include memory?  (Dummy targets don't.)  */
 927
 928 #define target_has_memory       \
 929      (current_target.to_has_memory)
 930
 931 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 932    we start a process.)  */
 933
 934 #define target_has_stack        \
 935      (current_target.to_has_stack)
 936
 937 /* Does the target have registers?  (Exec files don't.)  */
 938
 939 #define target_has_registers    \
 940      (current_target.to_has_registers)
 941
 942 /* Does the target have execution?  Can we make it jump (through
 943    hoops), or pop its stack a few times?  This means that the current
 944    target is currently executing; for some targets, that's the same as
 945    whether or not the target is capable of execution, but there are
 946    also targets which can be current while not executing.  In that
 947    case this will become true after target_create_inferior or
 948    target_attach.  */
 949
 950 #define target_has_execution    \
 951      (current_target.to_has_execution)
 952
 953 /* Can the target support the debugger control of thread execution?
 954    Can it lock the thread scheduler?  */
 955
 956 #define target_can_lock_scheduler \
 957      (current_target.to_has_thread_control & tc_schedlock)
 958
 959 /* Can the target support asynchronous execution? */
 960 #define target_can_async_p() (current_target.to_can_async_p ())
 961
 962 /* Is the target in asynchronous execution mode? */
 963 #define target_is_async_p() (current_target.to_is_async_p ())
 964
 965 /* Put the target in async mode with the specified callback function. */
 966 #define target_async(CALLBACK,CONTEXT) \
 967      (current_target.to_async ((CALLBACK), (CONTEXT)))
 968
 969 /* This is to be used ONLY within call_function_by_hand(). It provides
 970    a workaround, to have inferior function calls done in sychronous
 971    mode, even though the target is asynchronous. After
 972    target_async_mask(0) is called, calls to target_can_async_p() will
 973    return FALSE , so that target_resume() will not try to start the
 974    target asynchronously. After the inferior stops, we IMMEDIATELY
 975    restore the previous nature of the target, by calling
 976    target_async_mask(1). After that, target_can_async_p() will return
 977    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 978
 979    FIXME ezannoni 1999-12-13: we won't need this once we move
 980    the turning async on and off to the single execution commands,
 981    from where it is done currently, in remote_resume().  */
 982
 983 #define target_async_mask(MASK) \
 984   (current_target.to_async_mask (MASK))
 985
 986 /* Converts a process id to a string.  Usually, the string just contains
 987    `process xyz', but on some systems it may contain
 988    `process xyz thread abc'.  */
 989
 990 #undef target_pid_to_str
 991 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
 992
 993 #ifndef target_tid_to_str
 994 #define target_tid_to_str(PID) \
 995      target_pid_to_str (PID)
 996 extern char *normal_pid_to_str (ptid_t ptid);
 997 #endif
 998
 999 /* Return a short string describing extra information about PID,
1000    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
1001    is okay.  */
1002
1003 #define target_extra_thread_info(TP) \
1004      (current_target.to_extra_thread_info (TP))
1005
1006 /* Attempts to find the pathname of the executable file
1007    that was run to create a specified process.
1008
1009    The process PID must be stopped when this operation is used.
1010
1011    If the executable file cannot be determined, NULL is returned.
1012
1013    Else, a pointer to a character string containing the pathname
1014    is returned.  This string should be copied into a buffer by
1015    the client if the string will not be immediately used, or if
1016    it must persist.  */
1017
1018 #define target_pid_to_exec_file(pid) \
1019      (current_target.to_pid_to_exec_file) (pid)
1020
1021 /*
1022  * Iterator function for target memory regions.
1023  * Calls a callback function once for each memory region 'mapped'
1024  * in the child process.  Defined as a simple macro rather than
1025  * as a function macro so that it can be tested for nullity.
1026  */
1027
1028 #define target_find_memory_regions(FUNC, DATA) \
1029      (current_target.to_find_memory_regions) (FUNC, DATA)
1030
1031 /*
1032  * Compose corefile .note section.
1033  */
1034
1035 #define target_make_corefile_notes(BFD, SIZE_P) \
1036      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1037
1038 /* Thread-local values.  */
1039 #define target_get_thread_local_address \
1040     (current_target.to_get_thread_local_address)
1041 #define target_get_thread_local_address_p() \
1042     (target_get_thread_local_address != NULL)
1043
1044
1045 /* Hardware watchpoint interfaces.  */
1046
1047 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1048    write).  */
1049
1050 #ifndef STOPPED_BY_WATCHPOINT
1051 #define STOPPED_BY_WATCHPOINT(w) \
1052    (*current_target.to_stopped_by_watchpoint) ()
1053 #endif
1054
1055 /* Non-zero if we have steppable watchpoints  */
1056
1057 #ifndef HAVE_STEPPABLE_WATCHPOINT
1058 #define HAVE_STEPPABLE_WATCHPOINT \
1059    (current_target.to_have_steppable_watchpoint)
1060 #endif
1061
1062 /* Non-zero if we have continuable watchpoints  */
1063
1064 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1065 #define HAVE_CONTINUABLE_WATCHPOINT \
1066    (current_target.to_have_continuable_watchpoint)
1067 #endif
1068
1069 /* Provide defaults for hardware watchpoint functions.  */
1070
1071 /* If the *_hw_beakpoint functions have not been defined
1072    elsewhere use the definitions in the target vector.  */
1073
1074 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1075    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1076    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1077    (including this one?).  OTHERTYPE is who knows what...  */
1078
1079 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1080 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1081  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1082 #endif
1083
1084 #ifndef TARGET_REGION_OK_FOR_HW_WATCHPOINT
1085 #define TARGET_REGION_OK_FOR_HW_WATCHPOINT(addr, len) \
1086     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1087 #endif
1088
1089
1090 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1091    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1092    success, non-zero for failure.  */
1093
1094 #ifndef target_insert_watchpoint
1095 #define target_insert_watchpoint(addr, len, type)       \
1096      (*current_target.to_insert_watchpoint) (addr, len, type)
1097
1098 #define target_remove_watchpoint(addr, len, type)       \
1099      (*current_target.to_remove_watchpoint) (addr, len, type)
1100 #endif
1101
1102 #ifndef target_insert_hw_breakpoint
1103 #define target_insert_hw_breakpoint(bp_tgt) \
1104      (*current_target.to_insert_hw_breakpoint) (bp_tgt)
1105
1106 #define target_remove_hw_breakpoint(bp_tgt) \
1107      (*current_target.to_remove_hw_breakpoint) (bp_tgt)
1108 #endif
1109
1110 extern int target_stopped_data_address_p (struct target_ops *);
1111
1112 #ifndef target_stopped_data_address
1113 #define target_stopped_data_address(target, x) \
1114     (*target.to_stopped_data_address) (target, x)
1115 #else
1116 /* Horrible hack to get around existing macros :-(.  */
1117 #define target_stopped_data_address_p(CURRENT_TARGET) (1)
1118 #endif
1119
1120 #define target_watchpoint_addr_within_range(target, addr, start, length) \
1121   (*target.to_watchpoint_addr_within_range) (target, addr, start, length)
1122
1123 extern const struct target_desc *target_read_description (struct target_ops *);
1124
1125 /* Utility implementation of searching memory.  */
1126 extern int simple_search_memory (struct target_ops* ops,
1127                                  CORE_ADDR start_addr,
1128                                  ULONGEST search_space_len,
1129                                  const gdb_byte *pattern,
1130                                  ULONGEST pattern_len,
1131                                  CORE_ADDR *found_addrp);
1132
1133 /* Main entry point for searching memory.  */
1134 extern int target_search_memory (CORE_ADDR start_addr,
1135                                  ULONGEST search_space_len,
1136                                  const gdb_byte *pattern,
1137                                  ULONGEST pattern_len,
1138                                  CORE_ADDR *found_addrp);
1139
1140 /* Command logging facility.  */
1141
1142 #define target_log_command(p)                                           \
1143   do                                                                    \
1144     if (current_target.to_log_command)                                  \
1145       (*current_target.to_log_command) (p);                             \
1146   while (0)
1147
1148 /* Routines for maintenance of the target structures...
1149
1150    add_target:   Add a target to the list of all possible targets.
1151
1152    push_target:  Make this target the top of the stack of currently used
1153    targets, within its particular stratum of the stack.  Result
1154    is 0 if now atop the stack, nonzero if not on top (maybe
1155    should warn user).
1156
1157    unpush_target: Remove this from the stack of currently used targets,
1158    no matter where it is on the list.  Returns 0 if no
1159    change, 1 if removed from stack.
1160
1161    pop_target:   Remove the top thing on the stack of current targets.  */
1162
1163 extern void add_target (struct target_ops *);
1164
1165 extern int push_target (struct target_ops *);
1166
1167 extern int unpush_target (struct target_ops *);
1168
1169 extern void target_pre_inferior (int);
1170
1171 extern void target_preopen (int);
1172
1173 extern void pop_target (void);
1174
1175 extern CORE_ADDR target_translate_tls_address (struct objfile *objfile,
1176                                                CORE_ADDR offset);
1177
1178 /* Mark a pushed target as running or exited, for targets which do not
1179    automatically pop when not active.  */
1180
1181 void target_mark_running (struct target_ops *);
1182
1183 void target_mark_exited (struct target_ops *);
1184
1185 /* Struct section_table maps address ranges to file sections.  It is
1186    mostly used with BFD files, but can be used without (e.g. for handling
1187    raw disks, or files not in formats handled by BFD).  */
1188
1189 struct section_table
1190   {
1191     CORE_ADDR addr;             /* Lowest address in section */
1192     CORE_ADDR endaddr;          /* 1+highest address in section */
1193
1194     struct bfd_section *the_bfd_section;
1195
1196     bfd *bfd;                   /* BFD file pointer */
1197   };
1198
1199 /* Return the "section" containing the specified address.  */
1200 struct section_table *target_section_by_addr (struct target_ops *target,
1201                                               CORE_ADDR addr);
1202
1203
1204 /* From mem-break.c */
1205
1206 extern int memory_remove_breakpoint (struct bp_target_info *);
1207
1208 extern int memory_insert_breakpoint (struct bp_target_info *);
1209
1210 extern int default_memory_remove_breakpoint (struct gdbarch *, struct bp_target_info *);
1211
1212 extern int default_memory_insert_breakpoint (struct gdbarch *, struct bp_target_info *);
1213
1214
1215 /* From target.c */
1216
1217 extern void initialize_targets (void);
1218
1219 extern void noprocess (void);
1220
1221 extern void target_require_runnable (void);
1222
1223 extern void find_default_attach (char *, int);
1224
1225 extern void find_default_create_inferior (char *, char *, char **, int);
1226
1227 extern struct target_ops *find_run_target (void);
1228
1229 extern struct target_ops *find_core_target (void);
1230
1231 extern struct target_ops *find_target_beneath (struct target_ops *);
1232
1233 extern int target_resize_to_sections (struct target_ops *target,
1234                                       int num_added);
1235
1236 extern void remove_target_sections (bfd *abfd);
1237
1238 \f
1239 /* Stuff that should be shared among the various remote targets.  */
1240
1241 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1242    information (higher values, more information).  */
1243 extern int remote_debug;
1244
1245 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1246 extern int baud_rate;
1247 /* Timeout limit for response from target. */
1248 extern int remote_timeout;
1249
1250 \f
1251 /* Functions for helping to write a native target.  */
1252
1253 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1254 extern void store_waitstatus (struct target_waitstatus *, int);
1255
1256 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1257    targ_signal SIGNO has an equivalent ``host'' representation.  */
1258 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1259    to the shorter target_signal_p() because it is far less ambigious.
1260    In this context ``target_signal'' refers to GDB's internal
1261    representation of the target's set of signals while ``host signal''
1262    refers to the target operating system's signal.  Confused?  */
1263
1264 extern int target_signal_to_host_p (enum target_signal signo);
1265
1266 /* Convert between host signal numbers and enum target_signal's.
1267    target_signal_to_host() returns 0 and prints a warning() on GDB's
1268    console if SIGNO has no equivalent host representation.  */
1269 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1270    refering to the target operating system's signal numbering.
1271    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1272    gdb_signal'' would probably be better as it is refering to GDB's
1273    internal representation of a target operating system's signal.  */
1274
1275 extern enum target_signal target_signal_from_host (int);
1276 extern int target_signal_to_host (enum target_signal);
1277
1278 extern enum target_signal default_target_signal_from_host (struct gdbarch *,
1279                                                            int);
1280 extern int default_target_signal_to_host (struct gdbarch *,
1281                                           enum target_signal);
1282
1283 /* Convert from a number used in a GDB command to an enum target_signal.  */
1284 extern enum target_signal target_signal_from_command (int);
1285
1286 /* Any target can call this to switch to remote protocol (in remote.c). */
1287 extern void push_remote_target (char *name, int from_tty);
1288
1289 /* Set the show memory breakpoints mode to show, and installs a cleanup
1290    to restore it back to the current value.  */
1291 extern struct cleanup *make_show_memory_breakpoints_cleanup (int show);
1292
1293 \f
1294 /* Imported from machine dependent code */
1295
1296 /* Blank target vector entries are initialized to target_ignore. */
1297 void target_ignore (void);
1298
1299 extern struct target_ops deprecated_child_ops;
1300
1301 #endif /* !defined (TARGET_H) */