gdb/target.h

   1 /* Interface between GDB and target environments, including files and processes
   2
   3    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   4    2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
   5    Free Software Foundation, Inc.
   6
   7    Contributed by Cygnus Support.  Written by John Gilmore.
   8
   9    This file is part of GDB.
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  23
  24 #if !defined (TARGET_H)
  25 #define TARGET_H
  26
  27 struct objfile;
  28 struct ui_file;
  29 struct mem_attrib;
  30 struct target_ops;
  31 struct bp_target_info;
  32 struct regcache;
  33
  34 /* This include file defines the interface between the main part
  35    of the debugger, and the part which is target-specific, or
  36    specific to the communications interface between us and the
  37    target.
  38
  39    A TARGET is an interface between the debugger and a particular
  40    kind of file or process.  Targets can be STACKED in STRATA,
  41    so that more than one target can potentially respond to a request.
  42    In particular, memory accesses will walk down the stack of targets
  43    until they find a target that is interested in handling that particular
  44    address.  STRATA are artificial boundaries on the stack, within
  45    which particular kinds of targets live.  Strata exist so that
  46    people don't get confused by pushing e.g. a process target and then
  47    a file target, and wondering why they can't see the current values
  48    of variables any more (the file target is handling them and they
  49    never get to the process target).  So when you push a file target,
  50    it goes into the file stratum, which is always below the process
  51    stratum.  */
  52
  53 #include "bfd.h"
  54 #include "symtab.h"
  55 #include "dcache.h"
  56 #include "memattr.h"
  57 #include "vec.h"
  58
  59 enum strata
  60   {
  61     dummy_stratum,              /* The lowest of the low */
  62     file_stratum,               /* Executable files, etc */
  63     core_stratum,               /* Core dump files */
  64     process_stratum,            /* Executing processes */
  65     thread_stratum              /* Executing threads */
  66   };
  67
  68 enum thread_control_capabilities
  69   {
  70     tc_none = 0,                /* Default: can't control thread execution.  */
  71     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  72   };
  73
  74 /* Stuff for target_wait.  */
  75
  76 /* Generally, what has the program done?  */
  77 enum target_waitkind
  78   {
  79     /* The program has exited.  The exit status is in value.integer.  */
  80     TARGET_WAITKIND_EXITED,
  81
  82     /* The program has stopped with a signal.  Which signal is in
  83        value.sig.  */
  84     TARGET_WAITKIND_STOPPED,
  85
  86     /* The program has terminated with a signal.  Which signal is in
  87        value.sig.  */
  88     TARGET_WAITKIND_SIGNALLED,
  89
  90     /* The program is letting us know that it dynamically loaded something
  91        (e.g. it called load(2) on AIX).  */
  92     TARGET_WAITKIND_LOADED,
  93
  94     /* The program has forked.  A "related" process' PTID is in
  95        value.related_pid.  I.e., if the child forks, value.related_pid
  96        is the parent's ID.  */
  97
  98     TARGET_WAITKIND_FORKED,
  99
 100     /* The program has vforked.  A "related" process's PTID is in
 101        value.related_pid.  */
 102
 103     TARGET_WAITKIND_VFORKED,
 104
 105     /* The program has exec'ed a new executable file.  The new file's
 106        pathname is pointed to by value.execd_pathname.  */
 107
 108     TARGET_WAITKIND_EXECD,
 109
 110     /* The program has entered or returned from a system call.  On
 111        HP-UX, this is used in the hardware watchpoint implementation.
 112        The syscall's unique integer ID number is in value.syscall_id */
 113
 114     TARGET_WAITKIND_SYSCALL_ENTRY,
 115     TARGET_WAITKIND_SYSCALL_RETURN,
 116
 117     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 118        within target_wait, but I'm not sure target_wait should be resuming the
 119        inferior.  */
 120     TARGET_WAITKIND_SPURIOUS,
 121
 122     /* An event has occured, but we should wait again.
 123        Remote_async_wait() returns this when there is an event
 124        on the inferior, but the rest of the world is not interested in
 125        it. The inferior has not stopped, but has just sent some output
 126        to the console, for instance. In this case, we want to go back
 127        to the event loop and wait there for another event from the
 128        inferior, rather than being stuck in the remote_async_wait()
 129        function. This way the event loop is responsive to other events,
 130        like for instance the user typing.  */
 131     TARGET_WAITKIND_IGNORE,
 132
 133     /* The target has run out of history information,
 134        and cannot run backward any further.  */
 135     TARGET_WAITKIND_NO_HISTORY
 136   };
 137
 138 struct target_waitstatus
 139   {
 140     enum target_waitkind kind;
 141
 142     /* Forked child pid, execd pathname, exit status or signal number.  */
 143     union
 144       {
 145         int integer;
 146         enum target_signal sig;
 147         ptid_t related_pid;
 148         char *execd_pathname;
 149         int syscall_id;
 150       }
 151     value;
 152   };
 153
 154 /* Possible types of events that the inferior handler will have to
 155    deal with.  */
 156 enum inferior_event_type
 157   {
 158     /* There is a request to quit the inferior, abandon it.  */
 159     INF_QUIT_REQ,
 160     /* Process a normal inferior event which will result in target_wait
 161        being called.  */
 162     INF_REG_EVENT,
 163     /* Deal with an error on the inferior.  */
 164     INF_ERROR,
 165     /* We are called because a timer went off.  */
 166     INF_TIMER,
 167     /* We are called to do stuff after the inferior stops.  */
 168     INF_EXEC_COMPLETE,
 169     /* We are called to do some stuff after the inferior stops, but we
 170        are expected to reenter the proceed() and
 171        handle_inferior_event() functions. This is used only in case of
 172        'step n' like commands.  */
 173     INF_EXEC_CONTINUE
 174   };
 175
 176 /* Return the string for a signal.  */
 177 extern const char *target_signal_to_string (enum target_signal);
 178
 179 /* Return the name (SIGHUP, etc.) for a signal.  */
 180 extern const char *target_signal_to_name (enum target_signal);
 181
 182 /* Given a name (SIGHUP, etc.), return its signal.  */
 183 enum target_signal target_signal_from_name (const char *);
 184 \f
 185 /* Target objects which can be transfered using target_read,
 186    target_write, et cetera.  */
 187
 188 enum target_object
 189 {
 190   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 191   TARGET_OBJECT_AVR,
 192   /* SPU target specific transfer.  See "spu-tdep.c".  */
 193   TARGET_OBJECT_SPU,
 194   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 195   TARGET_OBJECT_MEMORY,
 196   /* Memory, avoiding GDB's data cache and trusting the executable.
 197      Target implementations of to_xfer_partial never need to handle
 198      this object, and most callers should not use it.  */
 199   TARGET_OBJECT_RAW_MEMORY,
 200   /* Kernel Unwind Table.  See "ia64-tdep.c".  */
 201   TARGET_OBJECT_UNWIND_TABLE,
 202   /* Transfer auxilliary vector.  */
 203   TARGET_OBJECT_AUXV,
 204   /* StackGhost cookie.  See "sparc-tdep.c".  */
 205   TARGET_OBJECT_WCOOKIE,
 206   /* Target memory map in XML format.  */
 207   TARGET_OBJECT_MEMORY_MAP,
 208   /* Flash memory.  This object can be used to write contents to
 209      a previously erased flash memory.  Using it without erasing
 210      flash can have unexpected results.  Addresses are physical
 211      address on target, and not relative to flash start.  */
 212   TARGET_OBJECT_FLASH,
 213   /* Available target-specific features, e.g. registers and coprocessors.
 214      See "target-descriptions.c".  ANNEX should never be empty.  */
 215   TARGET_OBJECT_AVAILABLE_FEATURES,
 216   /* Currently loaded libraries, in XML format.  */
 217   TARGET_OBJECT_LIBRARIES,
 218   /* Get OS specific data.  The ANNEX specifies the type (running
 219      processes, etc.).  */
 220   TARGET_OBJECT_OSDATA
 221   /* Possible future objects: TARGET_OBJECT_FILE, ... */
 222 };
 223
 224 /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 225    OBJECT.  The OFFSET, for a seekable object, specifies the
 226    starting point.  The ANNEX can be used to provide additional
 227    data-specific information to the target.
 228
 229    Return the number of bytes actually transfered, or -1 if the
 230    transfer is not supported or otherwise fails.  Return of a positive
 231    value less than LEN indicates that no further transfer is possible.
 232    Unlike the raw to_xfer_partial interface, callers of these
 233    functions do not need to retry partial transfers.  */
 234
 235 extern LONGEST target_read (struct target_ops *ops,
 236                             enum target_object object,
 237                             const char *annex, gdb_byte *buf,
 238                             ULONGEST offset, LONGEST len);
 239
 240 extern LONGEST target_read_until_error (struct target_ops *ops,
 241                                         enum target_object object,
 242                                         const char *annex, gdb_byte *buf,
 243                                         ULONGEST offset, LONGEST len);
 244
 245 extern LONGEST target_write (struct target_ops *ops,
 246                              enum target_object object,
 247                              const char *annex, const gdb_byte *buf,
 248                              ULONGEST offset, LONGEST len);
 249
 250 /* Similar to target_write, except that it also calls PROGRESS with
 251    the number of bytes written and the opaque BATON after every
 252    successful partial write (and before the first write).  This is
 253    useful for progress reporting and user interaction while writing
 254    data.  To abort the transfer, the progress callback can throw an
 255    exception.  */
 256
 257 LONGEST target_write_with_progress (struct target_ops *ops,
 258                                     enum target_object object,
 259                                     const char *annex, const gdb_byte *buf,
 260                                     ULONGEST offset, LONGEST len,
 261                                     void (*progress) (ULONGEST, void *),
 262                                     void *baton);
 263
 264 /* Wrapper to perform a full read of unknown size.  OBJECT/ANNEX will
 265    be read using OPS.  The return value will be -1 if the transfer
 266    fails or is not supported; 0 if the object is empty; or the length
 267    of the object otherwise.  If a positive value is returned, a
 268    sufficiently large buffer will be allocated using xmalloc and
 269    returned in *BUF_P containing the contents of the object.
 270
 271    This method should be used for objects sufficiently small to store
 272    in a single xmalloc'd buffer, when no fixed bound on the object's
 273    size is known in advance.  Don't try to read TARGET_OBJECT_MEMORY
 274    through this function.  */
 275
 276 extern LONGEST target_read_alloc (struct target_ops *ops,
 277                                   enum target_object object,
 278                                   const char *annex, gdb_byte **buf_p);
 279
 280 /* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and
 281    returned as a string, allocated using xmalloc.  If an error occurs
 282    or the transfer is unsupported, NULL is returned.  Empty objects
 283    are returned as allocated but empty strings.  A warning is issued
 284    if the result contains any embedded NUL bytes.  */
 285
 286 extern char *target_read_stralloc (struct target_ops *ops,
 287                                    enum target_object object,
 288                                    const char *annex);
 289
 290 /* Wrappers to target read/write that perform memory transfers.  They
 291    throw an error if the memory transfer fails.
 292
 293    NOTE: cagney/2003-10-23: The naming schema is lifted from
 294    "frame.h".  The parameter order is lifted from get_frame_memory,
 295    which in turn lifted it from read_memory.  */
 296
 297 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 298                                gdb_byte *buf, LONGEST len);
 299 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 300                                             CORE_ADDR addr, int len);
 301 \f
 302 struct thread_info;             /* fwd decl for parameter list below: */
 303
 304 struct target_ops
 305   {
 306     struct target_ops *beneath; /* To the target under this one.  */
 307     char *to_shortname;         /* Name this target type */
 308     char *to_longname;          /* Name for printing */
 309     char *to_doc;               /* Documentation.  Does not include trailing
 310                                    newline, and starts with a one-line descrip-
 311                                    tion (probably similar to to_longname).  */
 312     /* Per-target scratch pad.  */
 313     void *to_data;
 314     /* The open routine takes the rest of the parameters from the
 315        command, and (if successful) pushes a new target onto the
 316        stack.  Targets should supply this routine, if only to provide
 317        an error message.  */
 318     void (*to_open) (char *, int);
 319     /* Old targets with a static target vector provide "to_close".
 320        New re-entrant targets provide "to_xclose" and that is expected
 321        to xfree everything (including the "struct target_ops").  */
 322     void (*to_xclose) (struct target_ops *targ, int quitting);
 323     void (*to_close) (int);
 324     void (*to_attach) (struct target_ops *ops, char *, int);
 325     void (*to_post_attach) (int);
 326     void (*to_detach) (struct target_ops *ops, char *, int);
 327     void (*to_disconnect) (struct target_ops *, char *, int);
 328     void (*to_resume) (ptid_t, int, enum target_signal);
 329     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 330     void (*to_fetch_registers) (struct regcache *, int);
 331     void (*to_store_registers) (struct regcache *, int);
 332     void (*to_prepare_to_store) (struct regcache *);
 333
 334     /* Transfer LEN bytes of memory between GDB address MYADDR and
 335        target address MEMADDR.  If WRITE, transfer them to the target, else
 336        transfer them from the target.  TARGET is the target from which we
 337        get this function.
 338
 339        Return value, N, is one of the following:
 340
 341        0 means that we can't handle this.  If errno has been set, it is the
 342        error which prevented us from doing it (FIXME: What about bfd_error?).
 343
 344        positive (call it N) means that we have transferred N bytes
 345        starting at MEMADDR.  We might be able to handle more bytes
 346        beyond this length, but no promises.
 347
 348        negative (call its absolute value N) means that we cannot
 349        transfer right at MEMADDR, but we could transfer at least
 350        something at MEMADDR + N.
 351
 352        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 353        to_xfer_partial and inferior inheritance.  */
 354
 355     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 356                                    int len, int write,
 357                                    struct mem_attrib *attrib,
 358                                    struct target_ops *target);
 359
 360     void (*to_files_info) (struct target_ops *);
 361     int (*to_insert_breakpoint) (struct bp_target_info *);
 362     int (*to_remove_breakpoint) (struct bp_target_info *);
 363     int (*to_can_use_hw_breakpoint) (int, int, int);
 364     int (*to_insert_hw_breakpoint) (struct bp_target_info *);
 365     int (*to_remove_hw_breakpoint) (struct bp_target_info *);
 366     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 367     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 368     int (*to_stopped_by_watchpoint) (void);
 369     int to_have_steppable_watchpoint;
 370     int to_have_continuable_watchpoint;
 371     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 372     int (*to_watchpoint_addr_within_range) (struct target_ops *,
 373                                             CORE_ADDR, CORE_ADDR, int);
 374     int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);
 375     void (*to_terminal_init) (void);
 376     void (*to_terminal_inferior) (void);
 377     void (*to_terminal_ours_for_output) (void);
 378     void (*to_terminal_ours) (void);
 379     void (*to_terminal_save_ours) (void);
 380     void (*to_terminal_info) (char *, int);
 381     void (*to_kill) (void);
 382     void (*to_load) (char *, int);
 383     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 384     void (*to_create_inferior) (struct target_ops *,
 385                                 char *, char *, char **, int);
 386     void (*to_post_startup_inferior) (ptid_t);
 387     void (*to_acknowledge_created_inferior) (int);
 388     void (*to_insert_fork_catchpoint) (int);
 389     int (*to_remove_fork_catchpoint) (int);
 390     void (*to_insert_vfork_catchpoint) (int);
 391     int (*to_remove_vfork_catchpoint) (int);
 392     int (*to_follow_fork) (struct target_ops *, int);
 393     void (*to_insert_exec_catchpoint) (int);
 394     int (*to_remove_exec_catchpoint) (int);
 395     int (*to_has_exited) (int, int, int *);
 396     void (*to_mourn_inferior) (struct target_ops *);
 397     int (*to_can_run) (void);
 398     void (*to_notice_signals) (ptid_t ptid);
 399     int (*to_thread_alive) (ptid_t ptid);
 400     void (*to_find_new_threads) (void);
 401     char *(*to_pid_to_str) (ptid_t);
 402     char *(*to_extra_thread_info) (struct thread_info *);
 403     void (*to_stop) (ptid_t);
 404     void (*to_rcmd) (char *command, struct ui_file *output);
 405     char *(*to_pid_to_exec_file) (int pid);
 406     void (*to_log_command) (const char *);
 407     enum strata to_stratum;
 408     int to_has_all_memory;
 409     int to_has_memory;
 410     int to_has_stack;
 411     int to_has_registers;
 412     int to_has_execution;
 413     int to_has_thread_control;  /* control thread execution */
 414     int to_attach_no_wait;
 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_supports_non_stop) (void);
 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     /* Build the PTID of the thread on which a given task is running,
 508        based on LWP and THREAD.  These values are extracted from the
 509        task Private_Data section of the Ada Task Control Block, and
 510        their interpretation depends on the target.  */
 511     ptid_t (*to_get_ada_task_ptid) (long lwp, long thread);
 512
 513     /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
 514        Return 0 if *READPTR is already at the end of the buffer.
 515        Return -1 if there is insufficient buffer for a whole entry.
 516        Return 1 if an entry was read into *TYPEP and *VALP.  */
 517     int (*to_auxv_parse) (struct target_ops *ops, gdb_byte **readptr,
 518                          gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp);
 519
 520     /* Search SEARCH_SPACE_LEN bytes beginning at START_ADDR for the
 521        sequence of bytes in PATTERN with length PATTERN_LEN.
 522
 523        The result is 1 if found, 0 if not found, and -1 if there was an error
 524        requiring halting of the search (e.g. memory read error).
 525        If the pattern is found the address is recorded in FOUND_ADDRP.  */
 526     int (*to_search_memory) (struct target_ops *ops,
 527                              CORE_ADDR start_addr, ULONGEST search_space_len,
 528                              const gdb_byte *pattern, ULONGEST pattern_len,
 529                              CORE_ADDR *found_addrp);
 530
 531     /* Can target execute in reverse?  */
 532     int (*to_can_execute_reverse) ();
 533
 534     /* Does this target support debugging multiple processes
 535        simultaneously?  */
 536     int (*to_supports_multi_process) (void);
 537
 538     int to_magic;
 539     /* Need sub-structure for target machine related rather than comm related?
 540      */
 541   };
 542
 543 /* Magic number for checking ops size.  If a struct doesn't end with this
 544    number, somebody changed the declaration but didn't change all the
 545    places that initialize one.  */
 546
 547 #define OPS_MAGIC       3840
 548
 549 /* The ops structure for our "current" target process.  This should
 550    never be NULL.  If there is no target, it points to the dummy_target.  */
 551
 552 extern struct target_ops current_target;
 553
 554 /* Define easy words for doing these operations on our current target.  */
 555
 556 #define target_shortname        (current_target.to_shortname)
 557 #define target_longname         (current_target.to_longname)
 558
 559 /* Does whatever cleanup is required for a target that we are no
 560    longer going to be calling.  QUITTING indicates that GDB is exiting
 561    and should not get hung on an error (otherwise it is important to
 562    perform clean termination, even if it takes a while).  This routine
 563    is automatically always called when popping the target off the
 564    target stack (to_beneath is undefined).  Closing file descriptors
 565    and freeing all memory allocated memory are typical things it
 566    should do.  */
 567
 568 void target_close (struct target_ops *targ, int quitting);
 569
 570 /* Attaches to a process on the target side.  Arguments are as passed
 571    to the `attach' command by the user.  This routine can be called
 572    when the target is not on the target-stack, if the target_can_run
 573    routine returns 1; in that case, it must push itself onto the stack.
 574    Upon exit, the target should be ready for normal operations, and
 575    should be ready to deliver the status of the process immediately
 576    (without waiting) to an upcoming target_wait call.  */
 577
 578 void target_attach (char *, int);
 579
 580 /* Some targets don't generate traps when attaching to the inferior,
 581    or their target_attach implementation takes care of the waiting.
 582    These targets must set to_attach_no_wait.  */
 583
 584 #define target_attach_no_wait \
 585      (current_target.to_attach_no_wait)
 586
 587 /* The target_attach operation places a process under debugger control,
 588    and stops the process.
 589
 590    This operation provides a target-specific hook that allows the
 591    necessary bookkeeping to be performed after an attach completes.  */
 592 #define target_post_attach(pid) \
 593      (*current_target.to_post_attach) (pid)
 594
 595 /* Takes a program previously attached to and detaches it.
 596    The program may resume execution (some targets do, some don't) and will
 597    no longer stop on signals, etc.  We better not have left any breakpoints
 598    in the program or it'll die when it hits one.  ARGS is arguments
 599    typed by the user (e.g. a signal to send the process).  FROM_TTY
 600    says whether to be verbose or not.  */
 601
 602 extern void target_detach (char *, int);
 603
 604 /* Disconnect from the current target without resuming it (leaving it
 605    waiting for a debugger).  */
 606
 607 extern void target_disconnect (char *, int);
 608
 609 /* Resume execution of the target process PTID.  STEP says whether to
 610    single-step or to run free; SIGGNAL is the signal to be given to
 611    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 612    pass TARGET_SIGNAL_DEFAULT.  */
 613
 614 extern void target_resume (ptid_t ptid, int step, enum target_signal signal);
 615
 616 /* Wait for process pid to do something.  PTID = -1 to wait for any
 617    pid to do something.  Return pid of child, or -1 in case of error;
 618    store status through argument pointer STATUS.  Note that it is
 619    _NOT_ OK to throw_exception() out of target_wait() without popping
 620    the debugging target from the stack; GDB isn't prepared to get back
 621    to the prompt with a debugging target but without the frame cache,
 622    stop_pc, etc., set up.  */
 623
 624 #define target_wait(ptid, status)               \
 625      (*current_target.to_wait) (ptid, status)
 626
 627 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 628
 629 #define target_fetch_registers(regcache, regno) \
 630      (*current_target.to_fetch_registers) (regcache, regno)
 631
 632 /* Store at least register REGNO, or all regs if REGNO == -1.
 633    It can store as many registers as it wants to, so target_prepare_to_store
 634    must have been previously called.  Calls error() if there are problems.  */
 635
 636 #define target_store_registers(regcache, regs)  \
 637      (*current_target.to_store_registers) (regcache, regs)
 638
 639 /* Get ready to modify the registers array.  On machines which store
 640    individual registers, this doesn't need to do anything.  On machines
 641    which store all the registers in one fell swoop, this makes sure
 642    that REGISTERS contains all the registers from the program being
 643    debugged.  */
 644
 645 #define target_prepare_to_store(regcache)       \
 646      (*current_target.to_prepare_to_store) (regcache)
 647
 648 /* Returns true if this target can debug multiple processes
 649    simultaneously.  */
 650
 651 #define target_supports_multi_process() \
 652      (*current_target.to_supports_multi_process) ()
 653
 654 extern DCACHE *target_dcache;
 655
 656 extern int target_read_string (CORE_ADDR, char **, int, int *);
 657
 658 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 659
 660 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 661                                 int len);
 662
 663 extern int xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 664                         struct mem_attrib *, struct target_ops *);
 665
 666 /* Fetches the target's memory map.  If one is found it is sorted
 667    and returned, after some consistency checking.  Otherwise, NULL
 668    is returned.  */
 669 VEC(mem_region_s) *target_memory_map (void);
 670
 671 /* Erase the specified flash region.  */
 672 void target_flash_erase (ULONGEST address, LONGEST length);
 673
 674 /* Finish a sequence of flash operations.  */
 675 void target_flash_done (void);
 676
 677 /* Describes a request for a memory write operation.  */
 678 struct memory_write_request
 679   {
 680     /* Begining address that must be written. */
 681     ULONGEST begin;
 682     /* Past-the-end address. */
 683     ULONGEST end;
 684     /* The data to write. */
 685     gdb_byte *data;
 686     /* A callback baton for progress reporting for this request.  */
 687     void *baton;
 688   };
 689 typedef struct memory_write_request memory_write_request_s;
 690 DEF_VEC_O(memory_write_request_s);
 691
 692 /* Enumeration specifying different flash preservation behaviour.  */
 693 enum flash_preserve_mode
 694   {
 695     flash_preserve,
 696     flash_discard
 697   };
 698
 699 /* Write several memory blocks at once.  This version can be more
 700    efficient than making several calls to target_write_memory, in
 701    particular because it can optimize accesses to flash memory.
 702
 703    Moreover, this is currently the only memory access function in gdb
 704    that supports writing to flash memory, and it should be used for
 705    all cases where access to flash memory is desirable.
 706
 707    REQUESTS is the vector (see vec.h) of memory_write_request.
 708    PRESERVE_FLASH_P indicates what to do with blocks which must be
 709      erased, but not completely rewritten.
 710    PROGRESS_CB is a function that will be periodically called to provide
 711      feedback to user.  It will be called with the baton corresponding
 712      to the request currently being written.  It may also be called
 713      with a NULL baton, when preserved flash sectors are being rewritten.
 714
 715    The function returns 0 on success, and error otherwise.  */
 716 int target_write_memory_blocks (VEC(memory_write_request_s) *requests,
 717                                 enum flash_preserve_mode preserve_flash_p,
 718                                 void (*progress_cb) (ULONGEST, void *));
 719
 720 /* From infrun.c.  */
 721
 722 extern int inferior_has_forked (ptid_t pid, ptid_t *child_pid);
 723
 724 extern int inferior_has_vforked (ptid_t pid, ptid_t *child_pid);
 725
 726 extern int inferior_has_execd (ptid_t pid, char **execd_pathname);
 727
 728 /* From exec.c */
 729
 730 extern void print_section_info (struct target_ops *, bfd *);
 731
 732 /* Print a line about the current target.  */
 733
 734 #define target_files_info()     \
 735      (*current_target.to_files_info) (&current_target)
 736
 737 /* Insert a breakpoint at address BP_TGT->placed_address in the target
 738    machine.  Result is 0 for success, or an errno value.  */
 739
 740 #define target_insert_breakpoint(bp_tgt)        \
 741      (*current_target.to_insert_breakpoint) (bp_tgt)
 742
 743 /* Remove a breakpoint at address BP_TGT->placed_address in the target
 744    machine.  Result is 0 for success, or an errno value.  */
 745
 746 #define target_remove_breakpoint(bp_tgt)        \
 747      (*current_target.to_remove_breakpoint) (bp_tgt)
 748
 749 /* Initialize the terminal settings we record for the inferior,
 750    before we actually run the inferior.  */
 751
 752 #define target_terminal_init() \
 753      (*current_target.to_terminal_init) ()
 754
 755 /* Put the inferior's terminal settings into effect.
 756    This is preparation for starting or resuming the inferior.  */
 757
 758 #define target_terminal_inferior() \
 759      (*current_target.to_terminal_inferior) ()
 760
 761 /* Put some of our terminal settings into effect,
 762    enough to get proper results from our output,
 763    but do not change into or out of RAW mode
 764    so that no input is discarded.
 765
 766    After doing this, either terminal_ours or terminal_inferior
 767    should be called to get back to a normal state of affairs.  */
 768
 769 #define target_terminal_ours_for_output() \
 770      (*current_target.to_terminal_ours_for_output) ()
 771
 772 /* Put our terminal settings into effect.
 773    First record the inferior's terminal settings
 774    so they can be restored properly later.  */
 775
 776 #define target_terminal_ours() \
 777      (*current_target.to_terminal_ours) ()
 778
 779 /* Save our terminal settings.
 780    This is called from TUI after entering or leaving the curses
 781    mode.  Since curses modifies our terminal this call is here
 782    to take this change into account.  */
 783
 784 #define target_terminal_save_ours() \
 785      (*current_target.to_terminal_save_ours) ()
 786
 787 /* Print useful information about our terminal status, if such a thing
 788    exists.  */
 789
 790 #define target_terminal_info(arg, from_tty) \
 791      (*current_target.to_terminal_info) (arg, from_tty)
 792
 793 /* Kill the inferior process.   Make it go away.  */
 794
 795 #define target_kill() \
 796      (*current_target.to_kill) ()
 797
 798 /* Load an executable file into the target process.  This is expected
 799    to not only bring new code into the target process, but also to
 800    update GDB's symbol tables to match.
 801
 802    ARG contains command-line arguments, to be broken down with
 803    buildargv ().  The first non-switch argument is the filename to
 804    load, FILE; the second is a number (as parsed by strtoul (..., ...,
 805    0)), which is an offset to apply to the load addresses of FILE's
 806    sections.  The target may define switches, or other non-switch
 807    arguments, as it pleases.  */
 808
 809 extern void target_load (char *arg, int from_tty);
 810
 811 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 812    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 813    symbol should be returned.  The result is 0 if successful, nonzero
 814    if the symbol does not exist in the target environment.  This
 815    function should not call error() if communication with the target
 816    is interrupted, since it is called from symbol reading, but should
 817    return nonzero, possibly doing a complain().  */
 818
 819 #define target_lookup_symbol(name, addrp) \
 820      (*current_target.to_lookup_symbol) (name, addrp)
 821
 822 /* Start an inferior process and set inferior_ptid to its pid.
 823    EXEC_FILE is the file to run.
 824    ALLARGS is a string containing the arguments to the program.
 825    ENV is the environment vector to pass.  Errors reported with error().
 826    On VxWorks and various standalone systems, we ignore exec_file.  */
 827
 828 void target_create_inferior (char *exec_file, char *args,
 829                              char **env, int from_tty);
 830
 831 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 832    notification of inferior events such as fork and vork immediately
 833    after the inferior is created.  (This because of how gdb gets an
 834    inferior created via invoking a shell to do it.  In such a scenario,
 835    if the shell init file has commands in it, the shell will fork and
 836    exec for each of those commands, and we will see each such fork
 837    event.  Very bad.)
 838
 839    Such targets will supply an appropriate definition for this function.  */
 840
 841 #define target_post_startup_inferior(ptid) \
 842      (*current_target.to_post_startup_inferior) (ptid)
 843
 844 /* On some targets, the sequence of starting up an inferior requires
 845    some synchronization between gdb and the new inferior process, PID.  */
 846
 847 #define target_acknowledge_created_inferior(pid) \
 848      (*current_target.to_acknowledge_created_inferior) (pid)
 849
 850 /* On some targets, we can catch an inferior fork or vfork event when
 851    it occurs.  These functions insert/remove an already-created
 852    catchpoint for such events.  */
 853
 854 #define target_insert_fork_catchpoint(pid) \
 855      (*current_target.to_insert_fork_catchpoint) (pid)
 856
 857 #define target_remove_fork_catchpoint(pid) \
 858      (*current_target.to_remove_fork_catchpoint) (pid)
 859
 860 #define target_insert_vfork_catchpoint(pid) \
 861      (*current_target.to_insert_vfork_catchpoint) (pid)
 862
 863 #define target_remove_vfork_catchpoint(pid) \
 864      (*current_target.to_remove_vfork_catchpoint) (pid)
 865
 866 /* If the inferior forks or vforks, this function will be called at
 867    the next resume in order to perform any bookkeeping and fiddling
 868    necessary to continue debugging either the parent or child, as
 869    requested, and releasing the other.  Information about the fork
 870    or vfork event is available via get_last_target_status ().
 871    This function returns 1 if the inferior should not be resumed
 872    (i.e. there is another event pending).  */
 873
 874 int target_follow_fork (int follow_child);
 875
 876 /* On some targets, we can catch an inferior exec event when it
 877    occurs.  These functions insert/remove an already-created
 878    catchpoint for such events.  */
 879
 880 #define target_insert_exec_catchpoint(pid) \
 881      (*current_target.to_insert_exec_catchpoint) (pid)
 882
 883 #define target_remove_exec_catchpoint(pid) \
 884      (*current_target.to_remove_exec_catchpoint) (pid)
 885
 886 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 887    exit code of PID, if any.  */
 888
 889 #define target_has_exited(pid,wait_status,exit_status) \
 890      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 891
 892 /* The debugger has completed a blocking wait() call.  There is now
 893    some process event that must be processed.  This function should
 894    be defined by those targets that require the debugger to perform
 895    cleanup or internal state changes in response to the process event.  */
 896
 897 /* The inferior process has died.  Do what is right.  */
 898
 899 void target_mourn_inferior (void);
 900
 901 /* Does target have enough data to do a run or attach command? */
 902
 903 #define target_can_run(t) \
 904      ((t)->to_can_run) ()
 905
 906 /* post process changes to signal handling in the inferior.  */
 907
 908 #define target_notice_signals(ptid) \
 909      (*current_target.to_notice_signals) (ptid)
 910
 911 /* Check to see if a thread is still alive.  */
 912
 913 #define target_thread_alive(ptid) \
 914      (*current_target.to_thread_alive) (ptid)
 915
 916 /* Query for new threads and add them to the thread list.  */
 917
 918 #define target_find_new_threads() \
 919      (*current_target.to_find_new_threads) ()
 920
 921 /* Make target stop in a continuable fashion.  (For instance, under
 922    Unix, this should act like SIGSTOP).  This function is normally
 923    used by GUIs to implement a stop button.  */
 924
 925 #define target_stop(ptid) (*current_target.to_stop) (ptid)
 926
 927 /* Send the specified COMMAND to the target's monitor
 928    (shell,interpreter) for execution.  The result of the query is
 929    placed in OUTBUF.  */
 930
 931 #define target_rcmd(command, outbuf) \
 932      (*current_target.to_rcmd) (command, outbuf)
 933
 934
 935 /* Does the target include all of memory, or only part of it?  This
 936    determines whether we look up the target chain for other parts of
 937    memory if this target can't satisfy a request.  */
 938
 939 #define target_has_all_memory   \
 940      (current_target.to_has_all_memory)
 941
 942 /* Does the target include memory?  (Dummy targets don't.)  */
 943
 944 #define target_has_memory       \
 945      (current_target.to_has_memory)
 946
 947 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 948    we start a process.)  */
 949
 950 #define target_has_stack        \
 951      (current_target.to_has_stack)
 952
 953 /* Does the target have registers?  (Exec files don't.)  */
 954
 955 #define target_has_registers    \
 956      (current_target.to_has_registers)
 957
 958 /* Does the target have execution?  Can we make it jump (through
 959    hoops), or pop its stack a few times?  This means that the current
 960    target is currently executing; for some targets, that's the same as
 961    whether or not the target is capable of execution, but there are
 962    also targets which can be current while not executing.  In that
 963    case this will become true after target_create_inferior or
 964    target_attach.  */
 965
 966 #define target_has_execution    \
 967      (current_target.to_has_execution)
 968
 969 /* Can the target support the debugger control of thread execution?
 970    Can it lock the thread scheduler?  */
 971
 972 #define target_can_lock_scheduler \
 973      (current_target.to_has_thread_control & tc_schedlock)
 974
 975 /* Should the target enable async mode if it is supported?  Temporary
 976    cludge until async mode is a strict superset of sync mode.  */
 977 extern int target_async_permitted;
 978
 979 /* Can the target support asynchronous execution? */
 980 #define target_can_async_p() (current_target.to_can_async_p ())
 981
 982 /* Is the target in asynchronous execution mode? */
 983 #define target_is_async_p() (current_target.to_is_async_p ())
 984
 985 int target_supports_non_stop (void);
 986
 987 /* Put the target in async mode with the specified callback function. */
 988 #define target_async(CALLBACK,CONTEXT) \
 989      (current_target.to_async ((CALLBACK), (CONTEXT)))
 990
 991 /* This is to be used ONLY within call_function_by_hand(). It provides
 992    a workaround, to have inferior function calls done in sychronous
 993    mode, even though the target is asynchronous. After
 994    target_async_mask(0) is called, calls to target_can_async_p() will
 995    return FALSE , so that target_resume() will not try to start the
 996    target asynchronously. After the inferior stops, we IMMEDIATELY
 997    restore the previous nature of the target, by calling
 998    target_async_mask(1). After that, target_can_async_p() will return
 999    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
1000
1001    FIXME ezannoni 1999-12-13: we won't need this once we move
1002    the turning async on and off to the single execution commands,
1003    from where it is done currently, in remote_resume().  */
1004
1005 #define target_async_mask(MASK) \
1006   (current_target.to_async_mask (MASK))
1007
1008 /* Converts a process id to a string.  Usually, the string just contains
1009    `process xyz', but on some systems it may contain
1010    `process xyz thread abc'.  */
1011
1012 #undef target_pid_to_str
1013 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
1014
1015 #ifndef target_tid_to_str
1016 #define target_tid_to_str(PID) \
1017      target_pid_to_str (PID)
1018 extern char *normal_pid_to_str (ptid_t ptid);
1019 #endif
1020
1021 /* Return a short string describing extra information about PID,
1022    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
1023    is okay.  */
1024
1025 #define target_extra_thread_info(TP) \
1026      (current_target.to_extra_thread_info (TP))
1027
1028 /* Attempts to find the pathname of the executable file
1029    that was run to create a specified process.
1030
1031    The process PID must be stopped when this operation is used.
1032
1033    If the executable file cannot be determined, NULL is returned.
1034
1035    Else, a pointer to a character string containing the pathname
1036    is returned.  This string should be copied into a buffer by
1037    the client if the string will not be immediately used, or if
1038    it must persist.  */
1039
1040 #define target_pid_to_exec_file(pid) \
1041      (current_target.to_pid_to_exec_file) (pid)
1042
1043 /*
1044  * Iterator function for target memory regions.
1045  * Calls a callback function once for each memory region 'mapped'
1046  * in the child process.  Defined as a simple macro rather than
1047  * as a function macro so that it can be tested for nullity.
1048  */
1049
1050 #define target_find_memory_regions(FUNC, DATA) \
1051      (current_target.to_find_memory_regions) (FUNC, DATA)
1052
1053 /*
1054  * Compose corefile .note section.
1055  */
1056
1057 #define target_make_corefile_notes(BFD, SIZE_P) \
1058      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1059
1060 /* Thread-local values.  */
1061 #define target_get_thread_local_address \
1062     (current_target.to_get_thread_local_address)
1063 #define target_get_thread_local_address_p() \
1064     (target_get_thread_local_address != NULL)
1065
1066
1067 /* Hardware watchpoint interfaces.  */
1068
1069 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1070    write).  */
1071
1072 #ifndef STOPPED_BY_WATCHPOINT
1073 #define STOPPED_BY_WATCHPOINT(w) \
1074    (*current_target.to_stopped_by_watchpoint) ()
1075 #endif
1076
1077 /* Non-zero if we have steppable watchpoints  */
1078
1079 #ifndef HAVE_STEPPABLE_WATCHPOINT
1080 #define HAVE_STEPPABLE_WATCHPOINT \
1081    (current_target.to_have_steppable_watchpoint)
1082 #endif
1083
1084 /* Non-zero if we have continuable watchpoints  */
1085
1086 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1087 #define HAVE_CONTINUABLE_WATCHPOINT \
1088    (current_target.to_have_continuable_watchpoint)
1089 #endif
1090
1091 /* Provide defaults for hardware watchpoint functions.  */
1092
1093 /* If the *_hw_beakpoint functions have not been defined
1094    elsewhere use the definitions in the target vector.  */
1095
1096 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1097    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1098    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1099    (including this one?).  OTHERTYPE is who knows what...  */
1100
1101 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1102 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1103  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1104 #endif
1105
1106 #ifndef TARGET_REGION_OK_FOR_HW_WATCHPOINT
1107 #define TARGET_REGION_OK_FOR_HW_WATCHPOINT(addr, len) \
1108     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1109 #endif
1110
1111
1112 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1113    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1114    success, non-zero for failure.  */
1115
1116 #ifndef target_insert_watchpoint
1117 #define target_insert_watchpoint(addr, len, type)       \
1118      (*current_target.to_insert_watchpoint) (addr, len, type)
1119
1120 #define target_remove_watchpoint(addr, len, type)       \
1121      (*current_target.to_remove_watchpoint) (addr, len, type)
1122 #endif
1123
1124 #ifndef target_insert_hw_breakpoint
1125 #define target_insert_hw_breakpoint(bp_tgt) \
1126      (*current_target.to_insert_hw_breakpoint) (bp_tgt)
1127
1128 #define target_remove_hw_breakpoint(bp_tgt) \
1129      (*current_target.to_remove_hw_breakpoint) (bp_tgt)
1130 #endif
1131
1132 extern int target_stopped_data_address_p (struct target_ops *);
1133
1134 #ifndef target_stopped_data_address
1135 #define target_stopped_data_address(target, x) \
1136     (*target.to_stopped_data_address) (target, x)
1137 #else
1138 /* Horrible hack to get around existing macros :-(.  */
1139 #define target_stopped_data_address_p(CURRENT_TARGET) (1)
1140 #endif
1141
1142 #define target_watchpoint_addr_within_range(target, addr, start, length) \
1143   (*target.to_watchpoint_addr_within_range) (target, addr, start, length)
1144
1145 /* Target can execute in reverse?  */
1146 #define target_can_execute_reverse \
1147      (current_target.to_can_execute_reverse ? \
1148       current_target.to_can_execute_reverse () : 0)
1149
1150 extern const struct target_desc *target_read_description (struct target_ops *);
1151
1152 #define target_get_ada_task_ptid(lwp, tid) \
1153      (*current_target.to_get_ada_task_ptid) (lwp,tid)
1154
1155 /* Utility implementation of searching memory.  */
1156 extern int simple_search_memory (struct target_ops* ops,
1157                                  CORE_ADDR start_addr,
1158                                  ULONGEST search_space_len,
1159                                  const gdb_byte *pattern,
1160                                  ULONGEST pattern_len,
1161                                  CORE_ADDR *found_addrp);
1162
1163 /* Main entry point for searching memory.  */
1164 extern int target_search_memory (CORE_ADDR start_addr,
1165                                  ULONGEST search_space_len,
1166                                  const gdb_byte *pattern,
1167                                  ULONGEST pattern_len,
1168                                  CORE_ADDR *found_addrp);
1169
1170 /* Command logging facility.  */
1171
1172 #define target_log_command(p)                                           \
1173   do                                                                    \
1174     if (current_target.to_log_command)                                  \
1175       (*current_target.to_log_command) (p);                             \
1176   while (0)
1177
1178 /* Routines for maintenance of the target structures...
1179
1180    add_target:   Add a target to the list of all possible targets.
1181
1182    push_target:  Make this target the top of the stack of currently used
1183    targets, within its particular stratum of the stack.  Result
1184    is 0 if now atop the stack, nonzero if not on top (maybe
1185    should warn user).
1186
1187    unpush_target: Remove this from the stack of currently used targets,
1188    no matter where it is on the list.  Returns 0 if no
1189    change, 1 if removed from stack.
1190
1191    pop_target:   Remove the top thing on the stack of current targets.  */
1192
1193 extern void add_target (struct target_ops *);
1194
1195 extern int push_target (struct target_ops *);
1196
1197 extern int unpush_target (struct target_ops *);
1198
1199 extern void target_pre_inferior (int);
1200
1201 extern void target_preopen (int);
1202
1203 extern void pop_target (void);
1204
1205 /* Does whatever cleanup is required to get rid of all pushed targets.
1206    QUITTING is propagated to target_close; it indicates that GDB is
1207    exiting and should not get hung on an error (otherwise it is
1208    important to perform clean termination, even if it takes a
1209    while).  */
1210 extern void pop_all_targets (int quitting);
1211
1212 /* Like pop_all_targets, but pops only targets whose stratum is
1213    strictly above ABOVE_STRATUM.  */
1214 extern void pop_all_targets_above (enum strata above_stratum, int quitting);
1215
1216 extern CORE_ADDR target_translate_tls_address (struct objfile *objfile,
1217                                                CORE_ADDR offset);
1218
1219 /* Mark a pushed target as running or exited, for targets which do not
1220    automatically pop when not active.  */
1221
1222 void target_mark_running (struct target_ops *);
1223
1224 void target_mark_exited (struct target_ops *);
1225
1226 /* Struct section_table maps address ranges to file sections.  It is
1227    mostly used with BFD files, but can be used without (e.g. for handling
1228    raw disks, or files not in formats handled by BFD).  */
1229
1230 struct section_table
1231   {
1232     CORE_ADDR addr;             /* Lowest address in section */
1233     CORE_ADDR endaddr;          /* 1+highest address in section */
1234
1235     struct bfd_section *the_bfd_section;
1236
1237     bfd *bfd;                   /* BFD file pointer */
1238   };
1239
1240 /* Return the "section" containing the specified address.  */
1241 struct section_table *target_section_by_addr (struct target_ops *target,
1242                                               CORE_ADDR addr);
1243
1244
1245 /* From mem-break.c */
1246
1247 extern int memory_remove_breakpoint (struct bp_target_info *);
1248
1249 extern int memory_insert_breakpoint (struct bp_target_info *);
1250
1251 extern int default_memory_remove_breakpoint (struct gdbarch *, struct bp_target_info *);
1252
1253 extern int default_memory_insert_breakpoint (struct gdbarch *, struct bp_target_info *);
1254
1255
1256 /* From target.c */
1257
1258 extern void initialize_targets (void);
1259
1260 extern void noprocess (void);
1261
1262 extern void target_require_runnable (void);
1263
1264 extern void find_default_attach (struct target_ops *, char *, int);
1265
1266 extern void find_default_create_inferior (struct target_ops *,
1267                                           char *, char *, char **, int);
1268
1269 extern struct target_ops *find_run_target (void);
1270
1271 extern struct target_ops *find_core_target (void);
1272
1273 extern struct target_ops *find_target_beneath (struct target_ops *);
1274
1275 extern int target_resize_to_sections (struct target_ops *target,
1276                                       int num_added);
1277
1278 extern void remove_target_sections (bfd *abfd);
1279
1280 /* Read OS data object of type TYPE from the target, and return it in
1281    XML format.  The result is NUL-terminated and returned as a string,
1282    allocated using xmalloc.  If an error occurs or the transfer is
1283    unsupported, NULL is returned.  Empty objects are returned as
1284    allocated but empty strings.  */
1285
1286 extern char *target_get_osdata (const char *type);
1287
1288 \f
1289 /* Stuff that should be shared among the various remote targets.  */
1290
1291 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1292    information (higher values, more information).  */
1293 extern int remote_debug;
1294
1295 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1296 extern int baud_rate;
1297 /* Timeout limit for response from target. */
1298 extern int remote_timeout;
1299
1300 \f
1301 /* Functions for helping to write a native target.  */
1302
1303 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1304 extern void store_waitstatus (struct target_waitstatus *, int);
1305
1306 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1307    targ_signal SIGNO has an equivalent ``host'' representation.  */
1308 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1309    to the shorter target_signal_p() because it is far less ambigious.
1310    In this context ``target_signal'' refers to GDB's internal
1311    representation of the target's set of signals while ``host signal''
1312    refers to the target operating system's signal.  Confused?  */
1313
1314 extern int target_signal_to_host_p (enum target_signal signo);
1315
1316 /* Convert between host signal numbers and enum target_signal's.
1317    target_signal_to_host() returns 0 and prints a warning() on GDB's
1318    console if SIGNO has no equivalent host representation.  */
1319 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1320    refering to the target operating system's signal numbering.
1321    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1322    gdb_signal'' would probably be better as it is refering to GDB's
1323    internal representation of a target operating system's signal.  */
1324
1325 extern enum target_signal target_signal_from_host (int);
1326 extern int target_signal_to_host (enum target_signal);
1327
1328 extern enum target_signal default_target_signal_from_host (struct gdbarch *,
1329                                                            int);
1330 extern int default_target_signal_to_host (struct gdbarch *,
1331                                           enum target_signal);
1332
1333 /* Convert from a number used in a GDB command to an enum target_signal.  */
1334 extern enum target_signal target_signal_from_command (int);
1335
1336 /* Set the show memory breakpoints mode to show, and installs a cleanup
1337    to restore it back to the current value.  */
1338 extern struct cleanup *make_show_memory_breakpoints_cleanup (int show);
1339
1340 \f
1341 /* Imported from machine dependent code */
1342
1343 /* Blank target vector entries are initialized to target_ignore. */
1344 void target_ignore (void);
1345
1346 extern struct target_ops deprecated_child_ops;
1347
1348 #endif /* !defined (TARGET_H) */