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, 2010
   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 struct target_section_table;
  34 struct trace_state_variable;
  35
  36 /* This include file defines the interface between the main part
  37    of the debugger, and the part which is target-specific, or
  38    specific to the communications interface between us and the
  39    target.
  40
  41    A TARGET is an interface between the debugger and a particular
  42    kind of file or process.  Targets can be STACKED in STRATA,
  43    so that more than one target can potentially respond to a request.
  44    In particular, memory accesses will walk down the stack of targets
  45    until they find a target that is interested in handling that particular
  46    address.  STRATA are artificial boundaries on the stack, within
  47    which particular kinds of targets live.  Strata exist so that
  48    people don't get confused by pushing e.g. a process target and then
  49    a file target, and wondering why they can't see the current values
  50    of variables any more (the file target is handling them and they
  51    never get to the process target).  So when you push a file target,
  52    it goes into the file stratum, which is always below the process
  53    stratum.  */
  54
  55 #include "bfd.h"
  56 #include "symtab.h"
  57 #include "memattr.h"
  58 #include "vec.h"
  59 #include "gdb_signals.h"
  60
  61 enum strata
  62   {
  63     dummy_stratum,              /* The lowest of the low */
  64     file_stratum,               /* Executable files, etc */
  65     core_stratum,               /* Core dump files */
  66     process_stratum,            /* Executing processes */
  67     thread_stratum,             /* Executing threads */
  68     record_stratum,             /* Support record debugging */
  69     arch_stratum                /* Architecture overrides */
  70   };
  71
  72 enum thread_control_capabilities
  73   {
  74     tc_none = 0,                /* Default: can't control thread execution.  */
  75     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  76   };
  77
  78 /* Stuff for target_wait.  */
  79
  80 /* Generally, what has the program done?  */
  81 enum target_waitkind
  82   {
  83     /* The program has exited.  The exit status is in value.integer.  */
  84     TARGET_WAITKIND_EXITED,
  85
  86     /* The program has stopped with a signal.  Which signal is in
  87        value.sig.  */
  88     TARGET_WAITKIND_STOPPED,
  89
  90     /* The program has terminated with a signal.  Which signal is in
  91        value.sig.  */
  92     TARGET_WAITKIND_SIGNALLED,
  93
  94     /* The program is letting us know that it dynamically loaded something
  95        (e.g. it called load(2) on AIX).  */
  96     TARGET_WAITKIND_LOADED,
  97
  98     /* The program has forked.  A "related" process' PTID is in
  99        value.related_pid.  I.e., if the child forks, value.related_pid
 100        is the parent's ID.  */
 101
 102     TARGET_WAITKIND_FORKED,
 103
 104     /* The program has vforked.  A "related" process's PTID is in
 105        value.related_pid.  */
 106
 107     TARGET_WAITKIND_VFORKED,
 108
 109     /* The program has exec'ed a new executable file.  The new file's
 110        pathname is pointed to by value.execd_pathname.  */
 111
 112     TARGET_WAITKIND_EXECD,
 113
 114     /* The program had previously vforked, and now the child is done
 115        with the shared memory region, because it exec'ed or exited.
 116        Note that the event is reported to the vfork parent.  This is
 117        only used if GDB did not stay attached to the vfork child,
 118        otherwise, a TARGET_WAITKIND_EXECD or
 119        TARGET_WAITKIND_EXIT|SIGNALLED event associated with the child
 120        has the same effect.  */
 121     TARGET_WAITKIND_VFORK_DONE,
 122
 123     /* The program has entered or returned from a system call.  On
 124        HP-UX, this is used in the hardware watchpoint implementation.
 125        The syscall's unique integer ID number is in value.syscall_id */
 126
 127     TARGET_WAITKIND_SYSCALL_ENTRY,
 128     TARGET_WAITKIND_SYSCALL_RETURN,
 129
 130     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 131        within target_wait, but I'm not sure target_wait should be resuming the
 132        inferior.  */
 133     TARGET_WAITKIND_SPURIOUS,
 134
 135     /* An event has occured, but we should wait again.
 136        Remote_async_wait() returns this when there is an event
 137        on the inferior, but the rest of the world is not interested in
 138        it. The inferior has not stopped, but has just sent some output
 139        to the console, for instance. In this case, we want to go back
 140        to the event loop and wait there for another event from the
 141        inferior, rather than being stuck in the remote_async_wait()
 142        function. This way the event loop is responsive to other events,
 143        like for instance the user typing.  */
 144     TARGET_WAITKIND_IGNORE,
 145
 146     /* The target has run out of history information,
 147        and cannot run backward any further.  */
 148     TARGET_WAITKIND_NO_HISTORY
 149   };
 150
 151 struct target_waitstatus
 152   {
 153     enum target_waitkind kind;
 154
 155     /* Forked child pid, execd pathname, exit status, signal number or
 156        syscall number.  */
 157     union
 158       {
 159         int integer;
 160         enum target_signal sig;
 161         ptid_t related_pid;
 162         char *execd_pathname;
 163         int syscall_number;
 164       }
 165     value;
 166   };
 167
 168 /* Options that can be passed to target_wait.  */
 169
 170 /* Return immediately if there's no event already queued.  If this
 171    options is not requested, target_wait blocks waiting for an
 172    event.  */
 173 #define TARGET_WNOHANG 1
 174
 175 /* The structure below stores information about a system call.
 176    It is basically used in the "catch syscall" command, and in
 177    every function that gives information about a system call.
 178
 179    It's also good to mention that its fields represent everything
 180    that we currently know about a syscall in GDB.  */
 181 struct syscall
 182   {
 183     /* The syscall number.  */
 184     int number;
 185
 186     /* The syscall name.  */
 187     const char *name;
 188   };
 189
 190 /* Return a pretty printed form of target_waitstatus.
 191    Space for the result is malloc'd, caller must free.  */
 192 extern char *target_waitstatus_to_string (const struct target_waitstatus *);
 193
 194 /* Possible types of events that the inferior handler will have to
 195    deal with.  */
 196 enum inferior_event_type
 197   {
 198     /* There is a request to quit the inferior, abandon it.  */
 199     INF_QUIT_REQ,
 200     /* Process a normal inferior event which will result in target_wait
 201        being called.  */
 202     INF_REG_EVENT,
 203     /* Deal with an error on the inferior.  */
 204     INF_ERROR,
 205     /* We are called because a timer went off.  */
 206     INF_TIMER,
 207     /* We are called to do stuff after the inferior stops.  */
 208     INF_EXEC_COMPLETE,
 209     /* We are called to do some stuff after the inferior stops, but we
 210        are expected to reenter the proceed() and
 211        handle_inferior_event() functions. This is used only in case of
 212        'step n' like commands.  */
 213     INF_EXEC_CONTINUE
 214   };
 215 \f
 216 /* Target objects which can be transfered using target_read,
 217    target_write, et cetera.  */
 218
 219 enum target_object
 220 {
 221   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 222   TARGET_OBJECT_AVR,
 223   /* SPU target specific transfer.  See "spu-tdep.c".  */
 224   TARGET_OBJECT_SPU,
 225   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 226   TARGET_OBJECT_MEMORY,
 227   /* Memory, avoiding GDB's data cache and trusting the executable.
 228      Target implementations of to_xfer_partial never need to handle
 229      this object, and most callers should not use it.  */
 230   TARGET_OBJECT_RAW_MEMORY,
 231   /* Memory known to be part of the target's stack.  This is cached even
 232      if it is not in a region marked as such, since it is known to be
 233      "normal" RAM.  */
 234   TARGET_OBJECT_STACK_MEMORY,
 235   /* Kernel Unwind Table.  See "ia64-tdep.c".  */
 236   TARGET_OBJECT_UNWIND_TABLE,
 237   /* Transfer auxilliary vector.  */
 238   TARGET_OBJECT_AUXV,
 239   /* StackGhost cookie.  See "sparc-tdep.c".  */
 240   TARGET_OBJECT_WCOOKIE,
 241   /* Target memory map in XML format.  */
 242   TARGET_OBJECT_MEMORY_MAP,
 243   /* Flash memory.  This object can be used to write contents to
 244      a previously erased flash memory.  Using it without erasing
 245      flash can have unexpected results.  Addresses are physical
 246      address on target, and not relative to flash start.  */
 247   TARGET_OBJECT_FLASH,
 248   /* Available target-specific features, e.g. registers and coprocessors.
 249      See "target-descriptions.c".  ANNEX should never be empty.  */
 250   TARGET_OBJECT_AVAILABLE_FEATURES,
 251   /* Currently loaded libraries, in XML format.  */
 252   TARGET_OBJECT_LIBRARIES,
 253   /* Get OS specific data.  The ANNEX specifies the type (running
 254      processes, etc.).  */
 255   TARGET_OBJECT_OSDATA,
 256   /* Extra signal info.  Usually the contents of `siginfo_t' on unix
 257      platforms.  */
 258   TARGET_OBJECT_SIGNAL_INFO,
 259   /* Possible future objects: TARGET_OBJECT_FILE, ... */
 260 };
 261
 262 /* Enumeration of the kinds of traceframe searches that a target may
 263    be able to perform.  */
 264
 265 enum trace_find_type
 266   {
 267     tfind_number,
 268     tfind_pc,
 269     tfind_tp,
 270     tfind_range,
 271     tfind_outside,
 272   };
 273
 274 /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 275    OBJECT.  The OFFSET, for a seekable object, specifies the
 276    starting point.  The ANNEX can be used to provide additional
 277    data-specific information to the target.
 278
 279    Return the number of bytes actually transfered, or -1 if the
 280    transfer is not supported or otherwise fails.  Return of a positive
 281    value less than LEN indicates that no further transfer is possible.
 282    Unlike the raw to_xfer_partial interface, callers of these
 283    functions do not need to retry partial transfers.  */
 284
 285 extern LONGEST target_read (struct target_ops *ops,
 286                             enum target_object object,
 287                             const char *annex, gdb_byte *buf,
 288                             ULONGEST offset, LONGEST len);
 289
 290 extern LONGEST target_read_until_error (struct target_ops *ops,
 291                                         enum target_object object,
 292                                         const char *annex, gdb_byte *buf,
 293                                         ULONGEST offset, LONGEST len);
 294
 295 extern LONGEST target_write (struct target_ops *ops,
 296                              enum target_object object,
 297                              const char *annex, const gdb_byte *buf,
 298                              ULONGEST offset, LONGEST len);
 299
 300 /* Similar to target_write, except that it also calls PROGRESS with
 301    the number of bytes written and the opaque BATON after every
 302    successful partial write (and before the first write).  This is
 303    useful for progress reporting and user interaction while writing
 304    data.  To abort the transfer, the progress callback can throw an
 305    exception.  */
 306
 307 LONGEST target_write_with_progress (struct target_ops *ops,
 308                                     enum target_object object,
 309                                     const char *annex, const gdb_byte *buf,
 310                                     ULONGEST offset, LONGEST len,
 311                                     void (*progress) (ULONGEST, void *),
 312                                     void *baton);
 313
 314 /* Wrapper to perform a full read of unknown size.  OBJECT/ANNEX will
 315    be read using OPS.  The return value will be -1 if the transfer
 316    fails or is not supported; 0 if the object is empty; or the length
 317    of the object otherwise.  If a positive value is returned, a
 318    sufficiently large buffer will be allocated using xmalloc and
 319    returned in *BUF_P containing the contents of the object.
 320
 321    This method should be used for objects sufficiently small to store
 322    in a single xmalloc'd buffer, when no fixed bound on the object's
 323    size is known in advance.  Don't try to read TARGET_OBJECT_MEMORY
 324    through this function.  */
 325
 326 extern LONGEST target_read_alloc (struct target_ops *ops,
 327                                   enum target_object object,
 328                                   const char *annex, gdb_byte **buf_p);
 329
 330 /* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and
 331    returned as a string, allocated using xmalloc.  If an error occurs
 332    or the transfer is unsupported, NULL is returned.  Empty objects
 333    are returned as allocated but empty strings.  A warning is issued
 334    if the result contains any embedded NUL bytes.  */
 335
 336 extern char *target_read_stralloc (struct target_ops *ops,
 337                                    enum target_object object,
 338                                    const char *annex);
 339
 340 /* Wrappers to target read/write that perform memory transfers.  They
 341    throw an error if the memory transfer fails.
 342
 343    NOTE: cagney/2003-10-23: The naming schema is lifted from
 344    "frame.h".  The parameter order is lifted from get_frame_memory,
 345    which in turn lifted it from read_memory.  */
 346
 347 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 348                                gdb_byte *buf, LONGEST len);
 349 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 350                                             CORE_ADDR addr, int len,
 351                                             enum bfd_endian byte_order);
 352 \f
 353 struct thread_info;             /* fwd decl for parameter list below: */
 354
 355 struct target_ops
 356   {
 357     struct target_ops *beneath; /* To the target under this one.  */
 358     char *to_shortname;         /* Name this target type */
 359     char *to_longname;          /* Name for printing */
 360     char *to_doc;               /* Documentation.  Does not include trailing
 361                                    newline, and starts with a one-line descrip-
 362                                    tion (probably similar to to_longname).  */
 363     /* Per-target scratch pad.  */
 364     void *to_data;
 365     /* The open routine takes the rest of the parameters from the
 366        command, and (if successful) pushes a new target onto the
 367        stack.  Targets should supply this routine, if only to provide
 368        an error message.  */
 369     void (*to_open) (char *, int);
 370     /* Old targets with a static target vector provide "to_close".
 371        New re-entrant targets provide "to_xclose" and that is expected
 372        to xfree everything (including the "struct target_ops").  */
 373     void (*to_xclose) (struct target_ops *targ, int quitting);
 374     void (*to_close) (int);
 375     void (*to_attach) (struct target_ops *ops, char *, int);
 376     void (*to_post_attach) (int);
 377     void (*to_detach) (struct target_ops *ops, char *, int);
 378     void (*to_disconnect) (struct target_ops *, char *, int);
 379     void (*to_resume) (struct target_ops *, ptid_t, int, enum target_signal);
 380     ptid_t (*to_wait) (struct target_ops *,
 381                        ptid_t, struct target_waitstatus *, int);
 382     void (*to_fetch_registers) (struct target_ops *, struct regcache *, int);
 383     void (*to_store_registers) (struct target_ops *, struct regcache *, int);
 384     void (*to_prepare_to_store) (struct regcache *);
 385
 386     /* Transfer LEN bytes of memory between GDB address MYADDR and
 387        target address MEMADDR.  If WRITE, transfer them to the target, else
 388        transfer them from the target.  TARGET is the target from which we
 389        get this function.
 390
 391        Return value, N, is one of the following:
 392
 393        0 means that we can't handle this.  If errno has been set, it is the
 394        error which prevented us from doing it (FIXME: What about bfd_error?).
 395
 396        positive (call it N) means that we have transferred N bytes
 397        starting at MEMADDR.  We might be able to handle more bytes
 398        beyond this length, but no promises.
 399
 400        negative (call its absolute value N) means that we cannot
 401        transfer right at MEMADDR, but we could transfer at least
 402        something at MEMADDR + N.
 403
 404        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 405        to_xfer_partial and inferior inheritance.  */
 406
 407     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 408                                    int len, int write,
 409                                    struct mem_attrib *attrib,
 410                                    struct target_ops *target);
 411
 412     void (*to_files_info) (struct target_ops *);
 413     int (*to_insert_breakpoint) (struct gdbarch *, struct bp_target_info *);
 414     int (*to_remove_breakpoint) (struct gdbarch *, struct bp_target_info *);
 415     int (*to_can_use_hw_breakpoint) (int, int, int);
 416     int (*to_insert_hw_breakpoint) (struct gdbarch *, struct bp_target_info *);
 417     int (*to_remove_hw_breakpoint) (struct gdbarch *, struct bp_target_info *);
 418     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 419     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 420     int (*to_stopped_by_watchpoint) (void);
 421     int to_have_steppable_watchpoint;
 422     int to_have_continuable_watchpoint;
 423     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 424     int (*to_watchpoint_addr_within_range) (struct target_ops *,
 425                                             CORE_ADDR, CORE_ADDR, int);
 426     int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);
 427     void (*to_terminal_init) (void);
 428     void (*to_terminal_inferior) (void);
 429     void (*to_terminal_ours_for_output) (void);
 430     void (*to_terminal_ours) (void);
 431     void (*to_terminal_save_ours) (void);
 432     void (*to_terminal_info) (char *, int);
 433     void (*to_kill) (struct target_ops *);
 434     void (*to_load) (char *, int);
 435     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 436     void (*to_create_inferior) (struct target_ops *,
 437                                 char *, char *, char **, int);
 438     void (*to_post_startup_inferior) (ptid_t);
 439     void (*to_acknowledge_created_inferior) (int);
 440     void (*to_insert_fork_catchpoint) (int);
 441     int (*to_remove_fork_catchpoint) (int);
 442     void (*to_insert_vfork_catchpoint) (int);
 443     int (*to_remove_vfork_catchpoint) (int);
 444     int (*to_follow_fork) (struct target_ops *, int);
 445     void (*to_insert_exec_catchpoint) (int);
 446     int (*to_remove_exec_catchpoint) (int);
 447     int (*to_set_syscall_catchpoint) (int, int, int, int, int *);
 448     int (*to_has_exited) (int, int, int *);
 449     void (*to_mourn_inferior) (struct target_ops *);
 450     int (*to_can_run) (void);
 451     void (*to_notice_signals) (ptid_t ptid);
 452     int (*to_thread_alive) (struct target_ops *, ptid_t ptid);
 453     void (*to_find_new_threads) (struct target_ops *);
 454     char *(*to_pid_to_str) (struct target_ops *, ptid_t);
 455     char *(*to_extra_thread_info) (struct thread_info *);
 456     void (*to_stop) (ptid_t);
 457     void (*to_rcmd) (char *command, struct ui_file *output);
 458     char *(*to_pid_to_exec_file) (int pid);
 459     void (*to_log_command) (const char *);
 460     struct target_section_table *(*to_get_section_table) (struct target_ops *);
 461     enum strata to_stratum;
 462     int (*to_has_all_memory) (struct target_ops *);
 463     int (*to_has_memory) (struct target_ops *);
 464     int (*to_has_stack) (struct target_ops *);
 465     int (*to_has_registers) (struct target_ops *);
 466     int (*to_has_execution) (struct target_ops *);
 467     int to_has_thread_control;  /* control thread execution */
 468     int to_attach_no_wait;
 469     /* ASYNC target controls */
 470     int (*to_can_async_p) (void);
 471     int (*to_is_async_p) (void);
 472     void (*to_async) (void (*) (enum inferior_event_type, void *), void *);
 473     int (*to_async_mask) (int);
 474     int (*to_supports_non_stop) (void);
 475     /* find_memory_regions support method for gcore */
 476     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 477                                             unsigned long,
 478                                             int, int, int,
 479                                             void *),
 480                                    void *);
 481     /* make_corefile_notes support method for gcore */
 482     char * (*to_make_corefile_notes) (bfd *, int *);
 483     /* get_bookmark support method for bookmarks */
 484     gdb_byte * (*to_get_bookmark) (char *, int);
 485     /* goto_bookmark support method for bookmarks */
 486     void (*to_goto_bookmark) (gdb_byte *, int);
 487     /* Return the thread-local address at OFFSET in the
 488        thread-local storage for the thread PTID and the shared library
 489        or executable file given by OBJFILE.  If that block of
 490        thread-local storage hasn't been allocated yet, this function
 491        may return an error.  */
 492     CORE_ADDR (*to_get_thread_local_address) (struct target_ops *ops,
 493                                               ptid_t ptid,
 494                                               CORE_ADDR load_module_addr,
 495                                               CORE_ADDR offset);
 496
 497     /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 498        OBJECT.  The OFFSET, for a seekable object, specifies the
 499        starting point.  The ANNEX can be used to provide additional
 500        data-specific information to the target.
 501
 502        Return the number of bytes actually transfered, zero when no
 503        further transfer is possible, and -1 when the transfer is not
 504        supported.  Return of a positive value smaller than LEN does
 505        not indicate the end of the object, only the end of the
 506        transfer; higher level code should continue transferring if
 507        desired.  This is handled in target.c.
 508
 509        The interface does not support a "retry" mechanism.  Instead it
 510        assumes that at least one byte will be transfered on each
 511        successful call.
 512
 513        NOTE: cagney/2003-10-17: The current interface can lead to
 514        fragmented transfers.  Lower target levels should not implement
 515        hacks, such as enlarging the transfer, in an attempt to
 516        compensate for this.  Instead, the target stack should be
 517        extended so that it implements supply/collect methods and a
 518        look-aside object cache.  With that available, the lowest
 519        target can safely and freely "push" data up the stack.
 520
 521        See target_read and target_write for more information.  One,
 522        and only one, of readbuf or writebuf must be non-NULL.  */
 523
 524     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 525                                 enum target_object object, const char *annex,
 526                                 gdb_byte *readbuf, const gdb_byte *writebuf,
 527                                 ULONGEST offset, LONGEST len);
 528
 529     /* Returns the memory map for the target.  A return value of NULL
 530        means that no memory map is available.  If a memory address
 531        does not fall within any returned regions, it's assumed to be
 532        RAM.  The returned memory regions should not overlap.
 533
 534        The order of regions does not matter; target_memory_map will
 535        sort regions by starting address. For that reason, this
 536        function should not be called directly except via
 537        target_memory_map.
 538
 539        This method should not cache data; if the memory map could
 540        change unexpectedly, it should be invalidated, and higher
 541        layers will re-fetch it.  */
 542     VEC(mem_region_s) *(*to_memory_map) (struct target_ops *);
 543
 544     /* Erases the region of flash memory starting at ADDRESS, of
 545        length LENGTH.
 546
 547        Precondition: both ADDRESS and ADDRESS+LENGTH should be aligned
 548        on flash block boundaries, as reported by 'to_memory_map'.  */
 549     void (*to_flash_erase) (struct target_ops *,
 550                            ULONGEST address, LONGEST length);
 551
 552     /* Finishes a flash memory write sequence.  After this operation
 553        all flash memory should be available for writing and the result
 554        of reading from areas written by 'to_flash_write' should be
 555        equal to what was written.  */
 556     void (*to_flash_done) (struct target_ops *);
 557
 558     /* Describe the architecture-specific features of this target.
 559        Returns the description found, or NULL if no description
 560        was available.  */
 561     const struct target_desc *(*to_read_description) (struct target_ops *ops);
 562
 563     /* Build the PTID of the thread on which a given task is running,
 564        based on LWP and THREAD.  These values are extracted from the
 565        task Private_Data section of the Ada Task Control Block, and
 566        their interpretation depends on the target.  */
 567     ptid_t (*to_get_ada_task_ptid) (long lwp, long thread);
 568
 569     /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
 570        Return 0 if *READPTR is already at the end of the buffer.
 571        Return -1 if there is insufficient buffer for a whole entry.
 572        Return 1 if an entry was read into *TYPEP and *VALP.  */
 573     int (*to_auxv_parse) (struct target_ops *ops, gdb_byte **readptr,
 574                          gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp);
 575
 576     /* Search SEARCH_SPACE_LEN bytes beginning at START_ADDR for the
 577        sequence of bytes in PATTERN with length PATTERN_LEN.
 578
 579        The result is 1 if found, 0 if not found, and -1 if there was an error
 580        requiring halting of the search (e.g. memory read error).
 581        If the pattern is found the address is recorded in FOUND_ADDRP.  */
 582     int (*to_search_memory) (struct target_ops *ops,
 583                              CORE_ADDR start_addr, ULONGEST search_space_len,
 584                              const gdb_byte *pattern, ULONGEST pattern_len,
 585                              CORE_ADDR *found_addrp);
 586
 587     /* Can target execute in reverse?  */
 588     int (*to_can_execute_reverse) (void);
 589
 590     /* Does this target support debugging multiple processes
 591        simultaneously?  */
 592     int (*to_supports_multi_process) (void);
 593
 594     /* Determine current architecture of thread PTID.
 595
 596        The target is supposed to determine the architecture of the code where
 597        the target is currently stopped at (on Cell, if a target is in spu_run,
 598        to_thread_architecture would return SPU, otherwise PPC32 or PPC64).
 599        This is architecture used to perform decr_pc_after_break adjustment,
 600        and also determines the frame architecture of the innermost frame.
 601        ptrace operations need to operate according to target_gdbarch.
 602
 603        The default implementation always returns target_gdbarch.  */
 604     struct gdbarch *(*to_thread_architecture) (struct target_ops *, ptid_t);
 605
 606     /* Determine current address space of thread PTID.
 607
 608        The default implementation always returns the inferior's
 609        address space.  */
 610     struct address_space *(*to_thread_address_space) (struct target_ops *,
 611                                                       ptid_t);
 612
 613     /* Tracepoint-related operations.  */
 614
 615     /* Prepare the target for a tracing run.  */
 616     void (*to_trace_init) (void);
 617
 618     /* Send full details of a tracepoint to the target.  */
 619     void (*to_download_tracepoint) (struct breakpoint *t);
 620
 621     /* Send full details of a trace state variable to the target.  */
 622     void (*to_download_trace_state_variable) (struct trace_state_variable *tsv);
 623
 624     /* Inform the target info of memory regions that are readonly
 625        (such as text sections), and so it should return data from
 626        those rather than look in the trace buffer.  */
 627     void (*to_trace_set_readonly_regions) (void);
 628
 629     /* Start a trace run.  */
 630     void (*to_trace_start) (void);
 631
 632     /* Get the current status of a tracing run.  */
 633     int (*to_get_trace_status) (int *stop_reason);
 634
 635     /* Stop a trace run.  */
 636     void (*to_trace_stop) (void);
 637
 638    /* Ask the target to find a trace frame of the given type TYPE,
 639       using NUM, ADDR1, and ADDR2 as search parameters.  Returns the
 640       number of the trace frame, and also the tracepoint number at
 641       TPP.  */
 642     int (*to_trace_find) (enum trace_find_type type, int num,
 643                           ULONGEST addr1, ULONGEST addr2, int *tpp);
 644
 645     /* Get the value of the trace state variable number TSV, returning
 646        1 if the value is known and writing the value itself into the
 647        location pointed to by VAL, else returning 0.  */
 648     int (*to_get_trace_state_variable_value) (int tsv, LONGEST *val);
 649
 650     /* Set the target's tracing behavior in response to unexpected
 651        disconnection - set VAL to 1 to keep tracing, 0 to stop.  */
 652     void (*to_set_disconnected_tracing) (int val);
 653
 654     int to_magic;
 655     /* Need sub-structure for target machine related rather than comm related?
 656      */
 657   };
 658
 659 /* Magic number for checking ops size.  If a struct doesn't end with this
 660    number, somebody changed the declaration but didn't change all the
 661    places that initialize one.  */
 662
 663 #define OPS_MAGIC       3840
 664
 665 /* The ops structure for our "current" target process.  This should
 666    never be NULL.  If there is no target, it points to the dummy_target.  */
 667
 668 extern struct target_ops current_target;
 669
 670 /* Define easy words for doing these operations on our current target.  */
 671
 672 #define target_shortname        (current_target.to_shortname)
 673 #define target_longname         (current_target.to_longname)
 674
 675 /* Does whatever cleanup is required for a target that we are no
 676    longer going to be calling.  QUITTING indicates that GDB is exiting
 677    and should not get hung on an error (otherwise it is important to
 678    perform clean termination, even if it takes a while).  This routine
 679    is automatically always called when popping the target off the
 680    target stack (to_beneath is undefined).  Closing file descriptors
 681    and freeing all memory allocated memory are typical things it
 682    should do.  */
 683
 684 void target_close (struct target_ops *targ, int quitting);
 685
 686 /* Attaches to a process on the target side.  Arguments are as passed
 687    to the `attach' command by the user.  This routine can be called
 688    when the target is not on the target-stack, if the target_can_run
 689    routine returns 1; in that case, it must push itself onto the stack.
 690    Upon exit, the target should be ready for normal operations, and
 691    should be ready to deliver the status of the process immediately
 692    (without waiting) to an upcoming target_wait call.  */
 693
 694 void target_attach (char *, int);
 695
 696 /* Some targets don't generate traps when attaching to the inferior,
 697    or their target_attach implementation takes care of the waiting.
 698    These targets must set to_attach_no_wait.  */
 699
 700 #define target_attach_no_wait \
 701      (current_target.to_attach_no_wait)
 702
 703 /* The target_attach operation places a process under debugger control,
 704    and stops the process.
 705
 706    This operation provides a target-specific hook that allows the
 707    necessary bookkeeping to be performed after an attach completes.  */
 708 #define target_post_attach(pid) \
 709      (*current_target.to_post_attach) (pid)
 710
 711 /* Takes a program previously attached to and detaches it.
 712    The program may resume execution (some targets do, some don't) and will
 713    no longer stop on signals, etc.  We better not have left any breakpoints
 714    in the program or it'll die when it hits one.  ARGS is arguments
 715    typed by the user (e.g. a signal to send the process).  FROM_TTY
 716    says whether to be verbose or not.  */
 717
 718 extern void target_detach (char *, int);
 719
 720 /* Disconnect from the current target without resuming it (leaving it
 721    waiting for a debugger).  */
 722
 723 extern void target_disconnect (char *, int);
 724
 725 /* Resume execution of the target process PTID.  STEP says whether to
 726    single-step or to run free; SIGGNAL is the signal to be given to
 727    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 728    pass TARGET_SIGNAL_DEFAULT.  */
 729
 730 extern void target_resume (ptid_t ptid, int step, enum target_signal signal);
 731
 732 /* Wait for process pid to do something.  PTID = -1 to wait for any
 733    pid to do something.  Return pid of child, or -1 in case of error;
 734    store status through argument pointer STATUS.  Note that it is
 735    _NOT_ OK to throw_exception() out of target_wait() without popping
 736    the debugging target from the stack; GDB isn't prepared to get back
 737    to the prompt with a debugging target but without the frame cache,
 738    stop_pc, etc., set up.  OPTIONS is a bitwise OR of TARGET_W*
 739    options.  */
 740
 741 extern ptid_t target_wait (ptid_t ptid, struct target_waitstatus *status,
 742                            int options);
 743
 744 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 745
 746 extern void target_fetch_registers (struct regcache *regcache, int regno);
 747
 748 /* Store at least register REGNO, or all regs if REGNO == -1.
 749    It can store as many registers as it wants to, so target_prepare_to_store
 750    must have been previously called.  Calls error() if there are problems.  */
 751
 752 extern void target_store_registers (struct regcache *regcache, int regs);
 753
 754 /* Get ready to modify the registers array.  On machines which store
 755    individual registers, this doesn't need to do anything.  On machines
 756    which store all the registers in one fell swoop, this makes sure
 757    that REGISTERS contains all the registers from the program being
 758    debugged.  */
 759
 760 #define target_prepare_to_store(regcache)       \
 761      (*current_target.to_prepare_to_store) (regcache)
 762
 763 /* Determine current address space of thread PTID.  */
 764
 765 struct address_space *target_thread_address_space (ptid_t);
 766
 767 /* Returns true if this target can debug multiple processes
 768    simultaneously.  */
 769
 770 #define target_supports_multi_process() \
 771      (*current_target.to_supports_multi_process) ()
 772
 773 /* Invalidate all target dcaches.  */
 774 extern void target_dcache_invalidate (void);
 775
 776 extern int target_read_string (CORE_ADDR, char **, int, int *);
 777
 778 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 779
 780 extern int target_read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 781
 782 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 783                                 int len);
 784
 785 /* Fetches the target's memory map.  If one is found it is sorted
 786    and returned, after some consistency checking.  Otherwise, NULL
 787    is returned.  */
 788 VEC(mem_region_s) *target_memory_map (void);
 789
 790 /* Erase the specified flash region.  */
 791 void target_flash_erase (ULONGEST address, LONGEST length);
 792
 793 /* Finish a sequence of flash operations.  */
 794 void target_flash_done (void);
 795
 796 /* Describes a request for a memory write operation.  */
 797 struct memory_write_request
 798   {
 799     /* Begining address that must be written. */
 800     ULONGEST begin;
 801     /* Past-the-end address. */
 802     ULONGEST end;
 803     /* The data to write. */
 804     gdb_byte *data;
 805     /* A callback baton for progress reporting for this request.  */
 806     void *baton;
 807   };
 808 typedef struct memory_write_request memory_write_request_s;
 809 DEF_VEC_O(memory_write_request_s);
 810
 811 /* Enumeration specifying different flash preservation behaviour.  */
 812 enum flash_preserve_mode
 813   {
 814     flash_preserve,
 815     flash_discard
 816   };
 817
 818 /* Write several memory blocks at once.  This version can be more
 819    efficient than making several calls to target_write_memory, in
 820    particular because it can optimize accesses to flash memory.
 821
 822    Moreover, this is currently the only memory access function in gdb
 823    that supports writing to flash memory, and it should be used for
 824    all cases where access to flash memory is desirable.
 825
 826    REQUESTS is the vector (see vec.h) of memory_write_request.
 827    PRESERVE_FLASH_P indicates what to do with blocks which must be
 828      erased, but not completely rewritten.
 829    PROGRESS_CB is a function that will be periodically called to provide
 830      feedback to user.  It will be called with the baton corresponding
 831      to the request currently being written.  It may also be called
 832      with a NULL baton, when preserved flash sectors are being rewritten.
 833
 834    The function returns 0 on success, and error otherwise.  */
 835 int target_write_memory_blocks (VEC(memory_write_request_s) *requests,
 836                                 enum flash_preserve_mode preserve_flash_p,
 837                                 void (*progress_cb) (ULONGEST, void *));
 838
 839 /* From infrun.c.  */
 840
 841 extern int inferior_has_forked (ptid_t pid, ptid_t *child_pid);
 842
 843 extern int inferior_has_vforked (ptid_t pid, ptid_t *child_pid);
 844
 845 extern int inferior_has_execd (ptid_t pid, char **execd_pathname);
 846
 847 extern int inferior_has_called_syscall (ptid_t pid, int *syscall_number);
 848
 849 /* Print a line about the current target.  */
 850
 851 #define target_files_info()     \
 852      (*current_target.to_files_info) (&current_target)
 853
 854 /* Insert a breakpoint at address BP_TGT->placed_address in the target
 855    machine.  Result is 0 for success, or an errno value.  */
 856
 857 #define target_insert_breakpoint(gdbarch, bp_tgt)       \
 858      (*current_target.to_insert_breakpoint) (gdbarch, bp_tgt)
 859
 860 /* Remove a breakpoint at address BP_TGT->placed_address in the target
 861    machine.  Result is 0 for success, or an errno value.  */
 862
 863 #define target_remove_breakpoint(gdbarch, bp_tgt)       \
 864      (*current_target.to_remove_breakpoint) (gdbarch, bp_tgt)
 865
 866 /* Initialize the terminal settings we record for the inferior,
 867    before we actually run the inferior.  */
 868
 869 #define target_terminal_init() \
 870      (*current_target.to_terminal_init) ()
 871
 872 /* Put the inferior's terminal settings into effect.
 873    This is preparation for starting or resuming the inferior.  */
 874
 875 extern void target_terminal_inferior (void);
 876
 877 /* Put some of our terminal settings into effect,
 878    enough to get proper results from our output,
 879    but do not change into or out of RAW mode
 880    so that no input is discarded.
 881
 882    After doing this, either terminal_ours or terminal_inferior
 883    should be called to get back to a normal state of affairs.  */
 884
 885 #define target_terminal_ours_for_output() \
 886      (*current_target.to_terminal_ours_for_output) ()
 887
 888 /* Put our terminal settings into effect.
 889    First record the inferior's terminal settings
 890    so they can be restored properly later.  */
 891
 892 #define target_terminal_ours() \
 893      (*current_target.to_terminal_ours) ()
 894
 895 /* Save our terminal settings.
 896    This is called from TUI after entering or leaving the curses
 897    mode.  Since curses modifies our terminal this call is here
 898    to take this change into account.  */
 899
 900 #define target_terminal_save_ours() \
 901      (*current_target.to_terminal_save_ours) ()
 902
 903 /* Print useful information about our terminal status, if such a thing
 904    exists.  */
 905
 906 #define target_terminal_info(arg, from_tty) \
 907      (*current_target.to_terminal_info) (arg, from_tty)
 908
 909 /* Kill the inferior process.   Make it go away.  */
 910
 911 extern void target_kill (void);
 912
 913 /* Load an executable file into the target process.  This is expected
 914    to not only bring new code into the target process, but also to
 915    update GDB's symbol tables to match.
 916
 917    ARG contains command-line arguments, to be broken down with
 918    buildargv ().  The first non-switch argument is the filename to
 919    load, FILE; the second is a number (as parsed by strtoul (..., ...,
 920    0)), which is an offset to apply to the load addresses of FILE's
 921    sections.  The target may define switches, or other non-switch
 922    arguments, as it pleases.  */
 923
 924 extern void target_load (char *arg, int from_tty);
 925
 926 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 927    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 928    symbol should be returned.  The result is 0 if successful, nonzero
 929    if the symbol does not exist in the target environment.  This
 930    function should not call error() if communication with the target
 931    is interrupted, since it is called from symbol reading, but should
 932    return nonzero, possibly doing a complain().  */
 933
 934 #define target_lookup_symbol(name, addrp) \
 935      (*current_target.to_lookup_symbol) (name, addrp)
 936
 937 /* Start an inferior process and set inferior_ptid to its pid.
 938    EXEC_FILE is the file to run.
 939    ALLARGS is a string containing the arguments to the program.
 940    ENV is the environment vector to pass.  Errors reported with error().
 941    On VxWorks and various standalone systems, we ignore exec_file.  */
 942
 943 void target_create_inferior (char *exec_file, char *args,
 944                              char **env, int from_tty);
 945
 946 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 947    notification of inferior events such as fork and vork immediately
 948    after the inferior is created.  (This because of how gdb gets an
 949    inferior created via invoking a shell to do it.  In such a scenario,
 950    if the shell init file has commands in it, the shell will fork and
 951    exec for each of those commands, and we will see each such fork
 952    event.  Very bad.)
 953
 954    Such targets will supply an appropriate definition for this function.  */
 955
 956 #define target_post_startup_inferior(ptid) \
 957      (*current_target.to_post_startup_inferior) (ptid)
 958
 959 /* On some targets, the sequence of starting up an inferior requires
 960    some synchronization between gdb and the new inferior process, PID.  */
 961
 962 #define target_acknowledge_created_inferior(pid) \
 963      (*current_target.to_acknowledge_created_inferior) (pid)
 964
 965 /* On some targets, we can catch an inferior fork or vfork event when
 966    it occurs.  These functions insert/remove an already-created
 967    catchpoint for such events.  */
 968
 969 #define target_insert_fork_catchpoint(pid) \
 970      (*current_target.to_insert_fork_catchpoint) (pid)
 971
 972 #define target_remove_fork_catchpoint(pid) \
 973      (*current_target.to_remove_fork_catchpoint) (pid)
 974
 975 #define target_insert_vfork_catchpoint(pid) \
 976      (*current_target.to_insert_vfork_catchpoint) (pid)
 977
 978 #define target_remove_vfork_catchpoint(pid) \
 979      (*current_target.to_remove_vfork_catchpoint) (pid)
 980
 981 /* If the inferior forks or vforks, this function will be called at
 982    the next resume in order to perform any bookkeeping and fiddling
 983    necessary to continue debugging either the parent or child, as
 984    requested, and releasing the other.  Information about the fork
 985    or vfork event is available via get_last_target_status ().
 986    This function returns 1 if the inferior should not be resumed
 987    (i.e. there is another event pending).  */
 988
 989 int target_follow_fork (int follow_child);
 990
 991 /* On some targets, we can catch an inferior exec event when it
 992    occurs.  These functions insert/remove an already-created
 993    catchpoint for such events.  */
 994
 995 #define target_insert_exec_catchpoint(pid) \
 996      (*current_target.to_insert_exec_catchpoint) (pid)
 997
 998 #define target_remove_exec_catchpoint(pid) \
 999      (*current_target.to_remove_exec_catchpoint) (pid)
1000
1001 /* Syscall catch.
1002
1003    NEEDED is nonzero if any syscall catch (of any kind) is requested.
1004    If NEEDED is zero, it means the target can disable the mechanism to
1005    catch system calls because there are no more catchpoints of this type.
1006
1007    ANY_COUNT is nonzero if a generic (filter-less) syscall catch is
1008    being requested.  In this case, both TABLE_SIZE and TABLE should
1009    be ignored.
1010
1011    TABLE_SIZE is the number of elements in TABLE.  It only matters if
1012    ANY_COUNT is zero.
1013
1014    TABLE is an array of ints, indexed by syscall number.  An element in
1015    this array is nonzero if that syscall should be caught.  This argument
1016    only matters if ANY_COUNT is zero.  */
1017
1018 #define target_set_syscall_catchpoint(pid, needed, any_count, table_size, table) \
1019      (*current_target.to_set_syscall_catchpoint) (pid, needed, any_count, \
1020                                                   table_size, table)
1021
1022 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
1023    exit code of PID, if any.  */
1024
1025 #define target_has_exited(pid,wait_status,exit_status) \
1026      (*current_target.to_has_exited) (pid,wait_status,exit_status)
1027
1028 /* The debugger has completed a blocking wait() call.  There is now
1029    some process event that must be processed.  This function should
1030    be defined by those targets that require the debugger to perform
1031    cleanup or internal state changes in response to the process event.  */
1032
1033 /* The inferior process has died.  Do what is right.  */
1034
1035 void target_mourn_inferior (void);
1036
1037 /* Does target have enough data to do a run or attach command? */
1038
1039 #define target_can_run(t) \
1040      ((t)->to_can_run) ()
1041
1042 /* post process changes to signal handling in the inferior.  */
1043
1044 #define target_notice_signals(ptid) \
1045      (*current_target.to_notice_signals) (ptid)
1046
1047 /* Check to see if a thread is still alive.  */
1048
1049 extern int target_thread_alive (ptid_t ptid);
1050
1051 /* Query for new threads and add them to the thread list.  */
1052
1053 extern void target_find_new_threads (void);
1054
1055 /* Make target stop in a continuable fashion.  (For instance, under
1056    Unix, this should act like SIGSTOP).  This function is normally
1057    used by GUIs to implement a stop button.  */
1058
1059 #define target_stop(ptid) (*current_target.to_stop) (ptid)
1060
1061 /* Send the specified COMMAND to the target's monitor
1062    (shell,interpreter) for execution.  The result of the query is
1063    placed in OUTBUF.  */
1064
1065 #define target_rcmd(command, outbuf) \
1066      (*current_target.to_rcmd) (command, outbuf)
1067
1068
1069 /* Does the target include all of memory, or only part of it?  This
1070    determines whether we look up the target chain for other parts of
1071    memory if this target can't satisfy a request.  */
1072
1073 extern int target_has_all_memory_1 (void);
1074 #define target_has_all_memory target_has_all_memory_1 ()
1075
1076 /* Does the target include memory?  (Dummy targets don't.)  */
1077
1078 extern int target_has_memory_1 (void);
1079 #define target_has_memory target_has_memory_1 ()
1080
1081 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
1082    we start a process.)  */
1083
1084 extern int target_has_stack_1 (void);
1085 #define target_has_stack target_has_stack_1 ()
1086
1087 /* Does the target have registers?  (Exec files don't.)  */
1088
1089 extern int target_has_registers_1 (void);
1090 #define target_has_registers target_has_registers_1 ()
1091
1092 /* Does the target have execution?  Can we make it jump (through
1093    hoops), or pop its stack a few times?  This means that the current
1094    target is currently executing; for some targets, that's the same as
1095    whether or not the target is capable of execution, but there are
1096    also targets which can be current while not executing.  In that
1097    case this will become true after target_create_inferior or
1098    target_attach.  */
1099
1100 extern int target_has_execution_1 (void);
1101 #define target_has_execution target_has_execution_1 ()
1102
1103 /* Default implementations for process_stratum targets.  Return true
1104    if there's a selected inferior, false otherwise.  */
1105
1106 extern int default_child_has_all_memory (struct target_ops *ops);
1107 extern int default_child_has_memory (struct target_ops *ops);
1108 extern int default_child_has_stack (struct target_ops *ops);
1109 extern int default_child_has_registers (struct target_ops *ops);
1110 extern int default_child_has_execution (struct target_ops *ops);
1111
1112 /* Can the target support the debugger control of thread execution?
1113    Can it lock the thread scheduler?  */
1114
1115 #define target_can_lock_scheduler \
1116      (current_target.to_has_thread_control & tc_schedlock)
1117
1118 /* Should the target enable async mode if it is supported?  Temporary
1119    cludge until async mode is a strict superset of sync mode.  */
1120 extern int target_async_permitted;
1121
1122 /* Can the target support asynchronous execution? */
1123 #define target_can_async_p() (current_target.to_can_async_p ())
1124
1125 /* Is the target in asynchronous execution mode? */
1126 #define target_is_async_p() (current_target.to_is_async_p ())
1127
1128 int target_supports_non_stop (void);
1129
1130 /* Put the target in async mode with the specified callback function. */
1131 #define target_async(CALLBACK,CONTEXT) \
1132      (current_target.to_async ((CALLBACK), (CONTEXT)))
1133
1134 /* This is to be used ONLY within call_function_by_hand(). It provides
1135    a workaround, to have inferior function calls done in sychronous
1136    mode, even though the target is asynchronous. After
1137    target_async_mask(0) is called, calls to target_can_async_p() will
1138    return FALSE , so that target_resume() will not try to start the
1139    target asynchronously. After the inferior stops, we IMMEDIATELY
1140    restore the previous nature of the target, by calling
1141    target_async_mask(1). After that, target_can_async_p() will return
1142    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
1143
1144    FIXME ezannoni 1999-12-13: we won't need this once we move
1145    the turning async on and off to the single execution commands,
1146    from where it is done currently, in remote_resume().  */
1147
1148 #define target_async_mask(MASK) \
1149   (current_target.to_async_mask (MASK))
1150
1151 /* Converts a process id to a string.  Usually, the string just contains
1152    `process xyz', but on some systems it may contain
1153    `process xyz thread abc'.  */
1154
1155 extern char *target_pid_to_str (ptid_t ptid);
1156
1157 extern char *normal_pid_to_str (ptid_t ptid);
1158
1159 /* Return a short string describing extra information about PID,
1160    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
1161    is okay.  */
1162
1163 #define target_extra_thread_info(TP) \
1164      (current_target.to_extra_thread_info (TP))
1165
1166 /* Attempts to find the pathname of the executable file
1167    that was run to create a specified process.
1168
1169    The process PID must be stopped when this operation is used.
1170
1171    If the executable file cannot be determined, NULL is returned.
1172
1173    Else, a pointer to a character string containing the pathname
1174    is returned.  This string should be copied into a buffer by
1175    the client if the string will not be immediately used, or if
1176    it must persist.  */
1177
1178 #define target_pid_to_exec_file(pid) \
1179      (current_target.to_pid_to_exec_file) (pid)
1180
1181 /* See the to_thread_architecture description in struct target_ops.  */
1182
1183 #define target_thread_architecture(ptid) \
1184      (current_target.to_thread_architecture (&current_target, ptid))
1185
1186 /*
1187  * Iterator function for target memory regions.
1188  * Calls a callback function once for each memory region 'mapped'
1189  * in the child process.  Defined as a simple macro rather than
1190  * as a function macro so that it can be tested for nullity.
1191  */
1192
1193 #define target_find_memory_regions(FUNC, DATA) \
1194      (current_target.to_find_memory_regions) (FUNC, DATA)
1195
1196 /*
1197  * Compose corefile .note section.
1198  */
1199
1200 #define target_make_corefile_notes(BFD, SIZE_P) \
1201      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1202
1203 /* Bookmark interfaces.  */
1204 #define target_get_bookmark(ARGS, FROM_TTY) \
1205      (current_target.to_get_bookmark) (ARGS, FROM_TTY)
1206
1207 #define target_goto_bookmark(ARG, FROM_TTY) \
1208      (current_target.to_goto_bookmark) (ARG, FROM_TTY)
1209
1210 /* Hardware watchpoint interfaces.  */
1211
1212 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1213    write).  Only the INFERIOR_PTID task is being queried.  */
1214
1215 #define target_stopped_by_watchpoint \
1216    (*current_target.to_stopped_by_watchpoint)
1217
1218 /* Non-zero if we have steppable watchpoints  */
1219
1220 #define target_have_steppable_watchpoint \
1221    (current_target.to_have_steppable_watchpoint)
1222
1223 /* Non-zero if we have continuable watchpoints  */
1224
1225 #define target_have_continuable_watchpoint \
1226    (current_target.to_have_continuable_watchpoint)
1227
1228 /* Provide defaults for hardware watchpoint functions.  */
1229
1230 /* If the *_hw_beakpoint functions have not been defined
1231    elsewhere use the definitions in the target vector.  */
1232
1233 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1234    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1235    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1236    (including this one?).  OTHERTYPE is who knows what...  */
1237
1238 #define target_can_use_hardware_watchpoint(TYPE,CNT,OTHERTYPE) \
1239  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1240
1241 #define target_region_ok_for_hw_watchpoint(addr, len) \
1242     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1243
1244
1245 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1246    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1247    success, non-zero for failure.  */
1248
1249 #define target_insert_watchpoint(addr, len, type)       \
1250      (*current_target.to_insert_watchpoint) (addr, len, type)
1251
1252 #define target_remove_watchpoint(addr, len, type)       \
1253      (*current_target.to_remove_watchpoint) (addr, len, type)
1254
1255 #define target_insert_hw_breakpoint(gdbarch, bp_tgt) \
1256      (*current_target.to_insert_hw_breakpoint) (gdbarch, bp_tgt)
1257
1258 #define target_remove_hw_breakpoint(gdbarch, bp_tgt) \
1259      (*current_target.to_remove_hw_breakpoint) (gdbarch, bp_tgt)
1260
1261 /* Return non-zero if target knows the data address which triggered this
1262    target_stopped_by_watchpoint, in such case place it to *ADDR_P.  Only the
1263    INFERIOR_PTID task is being queried.  */
1264 #define target_stopped_data_address(target, addr_p) \
1265     (*target.to_stopped_data_address) (target, addr_p)
1266
1267 #define target_watchpoint_addr_within_range(target, addr, start, length) \
1268   (*target.to_watchpoint_addr_within_range) (target, addr, start, length)
1269
1270 /* Target can execute in reverse?  */
1271 #define target_can_execute_reverse \
1272      (current_target.to_can_execute_reverse ? \
1273       current_target.to_can_execute_reverse () : 0)
1274
1275 extern const struct target_desc *target_read_description (struct target_ops *);
1276
1277 #define target_get_ada_task_ptid(lwp, tid) \
1278      (*current_target.to_get_ada_task_ptid) (lwp,tid)
1279
1280 /* Utility implementation of searching memory.  */
1281 extern int simple_search_memory (struct target_ops* ops,
1282                                  CORE_ADDR start_addr,
1283                                  ULONGEST search_space_len,
1284                                  const gdb_byte *pattern,
1285                                  ULONGEST pattern_len,
1286                                  CORE_ADDR *found_addrp);
1287
1288 /* Main entry point for searching memory.  */
1289 extern int target_search_memory (CORE_ADDR start_addr,
1290                                  ULONGEST search_space_len,
1291                                  const gdb_byte *pattern,
1292                                  ULONGEST pattern_len,
1293                                  CORE_ADDR *found_addrp);
1294
1295 /* Tracepoint-related operations.  */
1296
1297 #define target_trace_init() \
1298   (*current_target.to_trace_init) ()
1299
1300 #define target_download_tracepoint(t) \
1301   (*current_target.to_download_tracepoint) (t)
1302
1303 #define target_download_trace_state_variable(tsv) \
1304   (*current_target.to_download_trace_state_variable) (tsv)
1305
1306 #define target_trace_start() \
1307   (*current_target.to_trace_start) ()
1308
1309 #define target_trace_set_readonly_regions() \
1310   (*current_target.to_trace_set_readonly_regions) ()
1311
1312 #define target_get_trace_status(stop_reason) \
1313   (*current_target.to_get_trace_status) (stop_reason)
1314
1315 #define target_trace_stop() \
1316   (*current_target.to_trace_stop) ()
1317
1318 #define target_trace_find(type,num,addr1,addr2,tpp) \
1319   (*current_target.to_trace_find) ((type), (num), (addr1), (addr2), (tpp))
1320
1321 #define target_get_trace_state_variable_value(tsv,val) \
1322   (*current_target.to_get_trace_state_variable_value) ((tsv), (val))
1323
1324 #define target_set_disconnected_tracing(val) \
1325   (*current_target.to_set_disconnected_tracing) (val)
1326
1327 /* Command logging facility.  */
1328
1329 #define target_log_command(p)                                           \
1330   do                                                                    \
1331     if (current_target.to_log_command)                                  \
1332       (*current_target.to_log_command) (p);                             \
1333   while (0)
1334
1335 /* Routines for maintenance of the target structures...
1336
1337    add_target:   Add a target to the list of all possible targets.
1338
1339    push_target:  Make this target the top of the stack of currently used
1340    targets, within its particular stratum of the stack.  Result
1341    is 0 if now atop the stack, nonzero if not on top (maybe
1342    should warn user).
1343
1344    unpush_target: Remove this from the stack of currently used targets,
1345    no matter where it is on the list.  Returns 0 if no
1346    change, 1 if removed from stack.
1347
1348    pop_target:   Remove the top thing on the stack of current targets.  */
1349
1350 extern void add_target (struct target_ops *);
1351
1352 extern int push_target (struct target_ops *);
1353
1354 extern int unpush_target (struct target_ops *);
1355
1356 extern void target_pre_inferior (int);
1357
1358 extern void target_preopen (int);
1359
1360 extern void pop_target (void);
1361
1362 /* Does whatever cleanup is required to get rid of all pushed targets.
1363    QUITTING is propagated to target_close; it indicates that GDB is
1364    exiting and should not get hung on an error (otherwise it is
1365    important to perform clean termination, even if it takes a
1366    while).  */
1367 extern void pop_all_targets (int quitting);
1368
1369 /* Like pop_all_targets, but pops only targets whose stratum is
1370    strictly above ABOVE_STRATUM.  */
1371 extern void pop_all_targets_above (enum strata above_stratum, int quitting);
1372
1373 extern CORE_ADDR target_translate_tls_address (struct objfile *objfile,
1374                                                CORE_ADDR offset);
1375
1376 /* Struct target_section maps address ranges to file sections.  It is
1377    mostly used with BFD files, but can be used without (e.g. for handling
1378    raw disks, or files not in formats handled by BFD).  */
1379
1380 struct target_section
1381   {
1382     CORE_ADDR addr;             /* Lowest address in section */
1383     CORE_ADDR endaddr;          /* 1+highest address in section */
1384
1385     struct bfd_section *the_bfd_section;
1386
1387     bfd *bfd;                   /* BFD file pointer */
1388   };
1389
1390 /* Holds an array of target sections.  Defined by [SECTIONS..SECTIONS_END[.  */
1391
1392 struct target_section_table
1393 {
1394   struct target_section *sections;
1395   struct target_section *sections_end;
1396 };
1397
1398 /* Return the "section" containing the specified address.  */
1399 struct target_section *target_section_by_addr (struct target_ops *target,
1400                                                CORE_ADDR addr);
1401
1402 /* Return the target section table this target (or the targets
1403    beneath) currently manipulate.  */
1404
1405 extern struct target_section_table *target_get_section_table
1406   (struct target_ops *target);
1407
1408 /* From mem-break.c */
1409
1410 extern int memory_remove_breakpoint (struct gdbarch *, struct bp_target_info *);
1411
1412 extern int memory_insert_breakpoint (struct gdbarch *, struct bp_target_info *);
1413
1414 extern int default_memory_remove_breakpoint (struct gdbarch *, struct bp_target_info *);
1415
1416 extern int default_memory_insert_breakpoint (struct gdbarch *, struct bp_target_info *);
1417
1418
1419 /* From target.c */
1420
1421 extern void initialize_targets (void);
1422
1423 extern NORETURN void noprocess (void) ATTR_NORETURN;
1424
1425 extern void target_require_runnable (void);
1426
1427 extern void find_default_attach (struct target_ops *, char *, int);
1428
1429 extern void find_default_create_inferior (struct target_ops *,
1430                                           char *, char *, char **, int);
1431
1432 extern struct target_ops *find_run_target (void);
1433
1434 extern struct target_ops *find_core_target (void);
1435
1436 extern struct target_ops *find_target_beneath (struct target_ops *);
1437
1438 /* Read OS data object of type TYPE from the target, and return it in
1439    XML format.  The result is NUL-terminated and returned as a string,
1440    allocated using xmalloc.  If an error occurs or the transfer is
1441    unsupported, NULL is returned.  Empty objects are returned as
1442    allocated but empty strings.  */
1443
1444 extern char *target_get_osdata (const char *type);
1445
1446 \f
1447 /* Stuff that should be shared among the various remote targets.  */
1448
1449 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1450    information (higher values, more information).  */
1451 extern int remote_debug;
1452
1453 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1454 extern int baud_rate;
1455 /* Timeout limit for response from target. */
1456 extern int remote_timeout;
1457
1458 \f
1459 /* Functions for helping to write a native target.  */
1460
1461 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1462 extern void store_waitstatus (struct target_waitstatus *, int);
1463
1464 /* These are in common/signals.c, but they're only used by gdb.  */
1465 extern enum target_signal default_target_signal_from_host (struct gdbarch *,
1466                                                            int);
1467 extern int default_target_signal_to_host (struct gdbarch *,
1468                                           enum target_signal);
1469
1470 /* Convert from a number used in a GDB command to an enum target_signal.  */
1471 extern enum target_signal target_signal_from_command (int);
1472 /* End of files in common/signals.c.  */
1473
1474 /* Set the show memory breakpoints mode to show, and installs a cleanup
1475    to restore it back to the current value.  */
1476 extern struct cleanup *make_show_memory_breakpoints_cleanup (int show);
1477
1478 \f
1479 /* Imported from machine dependent code */
1480
1481 /* Blank target vector entries are initialized to target_ignore. */
1482 void target_ignore (void);
1483
1484 extern struct target_ops deprecated_child_ops;
1485
1486 #endif /* !defined (TARGET_H) */