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 struct trace_status;
  36 struct uploaded_tsv;
  37 struct uploaded_tp;
  38
  39 /* This include file defines the interface between the main part
  40    of the debugger, and the part which is target-specific, or
  41    specific to the communications interface between us and the
  42    target.
  43
  44    A TARGET is an interface between the debugger and a particular
  45    kind of file or process.  Targets can be STACKED in STRATA,
  46    so that more than one target can potentially respond to a request.
  47    In particular, memory accesses will walk down the stack of targets
  48    until they find a target that is interested in handling that particular
  49    address.  STRATA are artificial boundaries on the stack, within
  50    which particular kinds of targets live.  Strata exist so that
  51    people don't get confused by pushing e.g. a process target and then
  52    a file target, and wondering why they can't see the current values
  53    of variables any more (the file target is handling them and they
  54    never get to the process target).  So when you push a file target,
  55    it goes into the file stratum, which is always below the process
  56    stratum.  */
  57
  58 #include "bfd.h"
  59 #include "symtab.h"
  60 #include "memattr.h"
  61 #include "vec.h"
  62 #include "gdb_signals.h"
  63
  64 enum strata
  65   {
  66     dummy_stratum,              /* The lowest of the low */
  67     file_stratum,               /* Executable files, etc */
  68     core_stratum,               /* Core dump files */
  69     process_stratum,            /* Executing processes */
  70     thread_stratum,             /* Executing threads */
  71     record_stratum,             /* Support record debugging */
  72     arch_stratum                /* Architecture overrides */
  73   };
  74
  75 enum thread_control_capabilities
  76   {
  77     tc_none = 0,                /* Default: can't control thread execution.  */
  78     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  79   };
  80
  81 /* Stuff for target_wait.  */
  82
  83 /* Generally, what has the program done?  */
  84 enum target_waitkind
  85   {
  86     /* The program has exited.  The exit status is in value.integer.  */
  87     TARGET_WAITKIND_EXITED,
  88
  89     /* The program has stopped with a signal.  Which signal is in
  90        value.sig.  */
  91     TARGET_WAITKIND_STOPPED,
  92
  93     /* The program has terminated with a signal.  Which signal is in
  94        value.sig.  */
  95     TARGET_WAITKIND_SIGNALLED,
  96
  97     /* The program is letting us know that it dynamically loaded something
  98        (e.g. it called load(2) on AIX).  */
  99     TARGET_WAITKIND_LOADED,
 100
 101     /* The program has forked.  A "related" process' PTID is in
 102        value.related_pid.  I.e., if the child forks, value.related_pid
 103        is the parent's ID.  */
 104
 105     TARGET_WAITKIND_FORKED,
 106
 107     /* The program has vforked.  A "related" process's PTID is in
 108        value.related_pid.  */
 109
 110     TARGET_WAITKIND_VFORKED,
 111
 112     /* The program has exec'ed a new executable file.  The new file's
 113        pathname is pointed to by value.execd_pathname.  */
 114
 115     TARGET_WAITKIND_EXECD,
 116
 117     /* The program had previously vforked, and now the child is done
 118        with the shared memory region, because it exec'ed or exited.
 119        Note that the event is reported to the vfork parent.  This is
 120        only used if GDB did not stay attached to the vfork child,
 121        otherwise, a TARGET_WAITKIND_EXECD or
 122        TARGET_WAITKIND_EXIT|SIGNALLED event associated with the child
 123        has the same effect.  */
 124     TARGET_WAITKIND_VFORK_DONE,
 125
 126     /* The program has entered or returned from a system call.  On
 127        HP-UX, this is used in the hardware watchpoint implementation.
 128        The syscall's unique integer ID number is in value.syscall_id */
 129
 130     TARGET_WAITKIND_SYSCALL_ENTRY,
 131     TARGET_WAITKIND_SYSCALL_RETURN,
 132
 133     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 134        within target_wait, but I'm not sure target_wait should be resuming the
 135        inferior.  */
 136     TARGET_WAITKIND_SPURIOUS,
 137
 138     /* An event has occured, but we should wait again.
 139        Remote_async_wait() returns this when there is an event
 140        on the inferior, but the rest of the world is not interested in
 141        it. The inferior has not stopped, but has just sent some output
 142        to the console, for instance. In this case, we want to go back
 143        to the event loop and wait there for another event from the
 144        inferior, rather than being stuck in the remote_async_wait()
 145        function. This way the event loop is responsive to other events,
 146        like for instance the user typing.  */
 147     TARGET_WAITKIND_IGNORE,
 148
 149     /* The target has run out of history information,
 150        and cannot run backward any further.  */
 151     TARGET_WAITKIND_NO_HISTORY
 152   };
 153
 154 struct target_waitstatus
 155   {
 156     enum target_waitkind kind;
 157
 158     /* Forked child pid, execd pathname, exit status, signal number or
 159        syscall number.  */
 160     union
 161       {
 162         int integer;
 163         enum target_signal sig;
 164         ptid_t related_pid;
 165         char *execd_pathname;
 166         int syscall_number;
 167       }
 168     value;
 169   };
 170
 171 /* Options that can be passed to target_wait.  */
 172
 173 /* Return immediately if there's no event already queued.  If this
 174    options is not requested, target_wait blocks waiting for an
 175    event.  */
 176 #define TARGET_WNOHANG 1
 177
 178 /* The structure below stores information about a system call.
 179    It is basically used in the "catch syscall" command, and in
 180    every function that gives information about a system call.
 181
 182    It's also good to mention that its fields represent everything
 183    that we currently know about a syscall in GDB.  */
 184 struct syscall
 185   {
 186     /* The syscall number.  */
 187     int number;
 188
 189     /* The syscall name.  */
 190     const char *name;
 191   };
 192
 193 /* Return a pretty printed form of target_waitstatus.
 194    Space for the result is malloc'd, caller must free.  */
 195 extern char *target_waitstatus_to_string (const struct target_waitstatus *);
 196
 197 /* Possible types of events that the inferior handler will have to
 198    deal with.  */
 199 enum inferior_event_type
 200   {
 201     /* There is a request to quit the inferior, abandon it.  */
 202     INF_QUIT_REQ,
 203     /* Process a normal inferior event which will result in target_wait
 204        being called.  */
 205     INF_REG_EVENT,
 206     /* Deal with an error on the inferior.  */
 207     INF_ERROR,
 208     /* We are called because a timer went off.  */
 209     INF_TIMER,
 210     /* We are called to do stuff after the inferior stops.  */
 211     INF_EXEC_COMPLETE,
 212     /* We are called to do some stuff after the inferior stops, but we
 213        are expected to reenter the proceed() and
 214        handle_inferior_event() functions. This is used only in case of
 215        'step n' like commands.  */
 216     INF_EXEC_CONTINUE
 217   };
 218 \f
 219 /* Target objects which can be transfered using target_read,
 220    target_write, et cetera.  */
 221
 222 enum target_object
 223 {
 224   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 225   TARGET_OBJECT_AVR,
 226   /* SPU target specific transfer.  See "spu-tdep.c".  */
 227   TARGET_OBJECT_SPU,
 228   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 229   TARGET_OBJECT_MEMORY,
 230   /* Memory, avoiding GDB's data cache and trusting the executable.
 231      Target implementations of to_xfer_partial never need to handle
 232      this object, and most callers should not use it.  */
 233   TARGET_OBJECT_RAW_MEMORY,
 234   /* Memory known to be part of the target's stack.  This is cached even
 235      if it is not in a region marked as such, since it is known to be
 236      "normal" RAM.  */
 237   TARGET_OBJECT_STACK_MEMORY,
 238   /* Kernel Unwind Table.  See "ia64-tdep.c".  */
 239   TARGET_OBJECT_UNWIND_TABLE,
 240   /* Transfer auxilliary vector.  */
 241   TARGET_OBJECT_AUXV,
 242   /* StackGhost cookie.  See "sparc-tdep.c".  */
 243   TARGET_OBJECT_WCOOKIE,
 244   /* Target memory map in XML format.  */
 245   TARGET_OBJECT_MEMORY_MAP,
 246   /* Flash memory.  This object can be used to write contents to
 247      a previously erased flash memory.  Using it without erasing
 248      flash can have unexpected results.  Addresses are physical
 249      address on target, and not relative to flash start.  */
 250   TARGET_OBJECT_FLASH,
 251   /* Available target-specific features, e.g. registers and coprocessors.
 252      See "target-descriptions.c".  ANNEX should never be empty.  */
 253   TARGET_OBJECT_AVAILABLE_FEATURES,
 254   /* Currently loaded libraries, in XML format.  */
 255   TARGET_OBJECT_LIBRARIES,
 256   /* Get OS specific data.  The ANNEX specifies the type (running
 257      processes, etc.).  */
 258   TARGET_OBJECT_OSDATA,
 259   /* Extra signal info.  Usually the contents of `siginfo_t' on unix
 260      platforms.  */
 261   TARGET_OBJECT_SIGNAL_INFO,
 262   /* The list of threads that are being debugged.  */
 263   TARGET_OBJECT_THREADS,
 264   /* Possible future objects: TARGET_OBJECT_FILE, ... */
 265 };
 266
 267 /* Enumeration of the kinds of traceframe searches that a target may
 268    be able to perform.  */
 269
 270 enum trace_find_type
 271   {
 272     tfind_number,
 273     tfind_pc,
 274     tfind_tp,
 275     tfind_range,
 276     tfind_outside,
 277   };
 278
 279 /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 280    OBJECT.  The OFFSET, for a seekable object, specifies the
 281    starting point.  The ANNEX can be used to provide additional
 282    data-specific information to the target.
 283
 284    Return the number of bytes actually transfered, or -1 if the
 285    transfer is not supported or otherwise fails.  Return of a positive
 286    value less than LEN indicates that no further transfer is possible.
 287    Unlike the raw to_xfer_partial interface, callers of these
 288    functions do not need to retry partial transfers.  */
 289
 290 extern LONGEST target_read (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_read_until_error (struct target_ops *ops,
 296                                         enum target_object object,
 297                                         const char *annex, gdb_byte *buf,
 298                                         ULONGEST offset, LONGEST len);
 299
 300 extern LONGEST target_write (struct target_ops *ops,
 301                              enum target_object object,
 302                              const char *annex, const gdb_byte *buf,
 303                              ULONGEST offset, LONGEST len);
 304
 305 /* Similar to target_write, except that it also calls PROGRESS with
 306    the number of bytes written and the opaque BATON after every
 307    successful partial write (and before the first write).  This is
 308    useful for progress reporting and user interaction while writing
 309    data.  To abort the transfer, the progress callback can throw an
 310    exception.  */
 311
 312 LONGEST target_write_with_progress (struct target_ops *ops,
 313                                     enum target_object object,
 314                                     const char *annex, const gdb_byte *buf,
 315                                     ULONGEST offset, LONGEST len,
 316                                     void (*progress) (ULONGEST, void *),
 317                                     void *baton);
 318
 319 /* Wrapper to perform a full read of unknown size.  OBJECT/ANNEX will
 320    be read using OPS.  The return value will be -1 if the transfer
 321    fails or is not supported; 0 if the object is empty; or the length
 322    of the object otherwise.  If a positive value is returned, a
 323    sufficiently large buffer will be allocated using xmalloc and
 324    returned in *BUF_P containing the contents of the object.
 325
 326    This method should be used for objects sufficiently small to store
 327    in a single xmalloc'd buffer, when no fixed bound on the object's
 328    size is known in advance.  Don't try to read TARGET_OBJECT_MEMORY
 329    through this function.  */
 330
 331 extern LONGEST target_read_alloc (struct target_ops *ops,
 332                                   enum target_object object,
 333                                   const char *annex, gdb_byte **buf_p);
 334
 335 /* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and
 336    returned as a string, allocated using xmalloc.  If an error occurs
 337    or the transfer is unsupported, NULL is returned.  Empty objects
 338    are returned as allocated but empty strings.  A warning is issued
 339    if the result contains any embedded NUL bytes.  */
 340
 341 extern char *target_read_stralloc (struct target_ops *ops,
 342                                    enum target_object object,
 343                                    const char *annex);
 344
 345 /* Wrappers to target read/write that perform memory transfers.  They
 346    throw an error if the memory transfer fails.
 347
 348    NOTE: cagney/2003-10-23: The naming schema is lifted from
 349    "frame.h".  The parameter order is lifted from get_frame_memory,
 350    which in turn lifted it from read_memory.  */
 351
 352 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 353                                gdb_byte *buf, LONGEST len);
 354 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 355                                             CORE_ADDR addr, int len,
 356                                             enum bfd_endian byte_order);
 357 \f
 358 struct thread_info;             /* fwd decl for parameter list below: */
 359
 360 struct target_ops
 361   {
 362     struct target_ops *beneath; /* To the target under this one.  */
 363     char *to_shortname;         /* Name this target type */
 364     char *to_longname;          /* Name for printing */
 365     char *to_doc;               /* Documentation.  Does not include trailing
 366                                    newline, and starts with a one-line descrip-
 367                                    tion (probably similar to to_longname).  */
 368     /* Per-target scratch pad.  */
 369     void *to_data;
 370     /* The open routine takes the rest of the parameters from the
 371        command, and (if successful) pushes a new target onto the
 372        stack.  Targets should supply this routine, if only to provide
 373        an error message.  */
 374     void (*to_open) (char *, int);
 375     /* Old targets with a static target vector provide "to_close".
 376        New re-entrant targets provide "to_xclose" and that is expected
 377        to xfree everything (including the "struct target_ops").  */
 378     void (*to_xclose) (struct target_ops *targ, int quitting);
 379     void (*to_close) (int);
 380     void (*to_attach) (struct target_ops *ops, char *, int);
 381     void (*to_post_attach) (int);
 382     void (*to_detach) (struct target_ops *ops, char *, int);
 383     void (*to_disconnect) (struct target_ops *, char *, int);
 384     void (*to_resume) (struct target_ops *, ptid_t, int, enum target_signal);
 385     ptid_t (*to_wait) (struct target_ops *,
 386                        ptid_t, struct target_waitstatus *, int);
 387     void (*to_fetch_registers) (struct target_ops *, struct regcache *, int);
 388     void (*to_store_registers) (struct target_ops *, struct regcache *, int);
 389     void (*to_prepare_to_store) (struct regcache *);
 390
 391     /* Transfer LEN bytes of memory between GDB address MYADDR and
 392        target address MEMADDR.  If WRITE, transfer them to the target, else
 393        transfer them from the target.  TARGET is the target from which we
 394        get this function.
 395
 396        Return value, N, is one of the following:
 397
 398        0 means that we can't handle this.  If errno has been set, it is the
 399        error which prevented us from doing it (FIXME: What about bfd_error?).
 400
 401        positive (call it N) means that we have transferred N bytes
 402        starting at MEMADDR.  We might be able to handle more bytes
 403        beyond this length, but no promises.
 404
 405        negative (call its absolute value N) means that we cannot
 406        transfer right at MEMADDR, but we could transfer at least
 407        something at MEMADDR + N.
 408
 409        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 410        to_xfer_partial and inferior inheritance.  */
 411
 412     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 413                                    int len, int write,
 414                                    struct mem_attrib *attrib,
 415                                    struct target_ops *target);
 416
 417     void (*to_files_info) (struct target_ops *);
 418     int (*to_insert_breakpoint) (struct gdbarch *, struct bp_target_info *);
 419     int (*to_remove_breakpoint) (struct gdbarch *, struct bp_target_info *);
 420     int (*to_can_use_hw_breakpoint) (int, int, int);
 421     int (*to_insert_hw_breakpoint) (struct gdbarch *, struct bp_target_info *);
 422     int (*to_remove_hw_breakpoint) (struct gdbarch *, struct bp_target_info *);
 423     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 424     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 425     int (*to_stopped_by_watchpoint) (void);
 426     int to_have_steppable_watchpoint;
 427     int to_have_continuable_watchpoint;
 428     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 429     int (*to_watchpoint_addr_within_range) (struct target_ops *,
 430                                             CORE_ADDR, CORE_ADDR, int);
 431     int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);
 432     void (*to_terminal_init) (void);
 433     void (*to_terminal_inferior) (void);
 434     void (*to_terminal_ours_for_output) (void);
 435     void (*to_terminal_ours) (void);
 436     void (*to_terminal_save_ours) (void);
 437     void (*to_terminal_info) (char *, int);
 438     void (*to_kill) (struct target_ops *);
 439     void (*to_load) (char *, int);
 440     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 441     void (*to_create_inferior) (struct target_ops *,
 442                                 char *, char *, char **, int);
 443     void (*to_post_startup_inferior) (ptid_t);
 444     void (*to_acknowledge_created_inferior) (int);
 445     void (*to_insert_fork_catchpoint) (int);
 446     int (*to_remove_fork_catchpoint) (int);
 447     void (*to_insert_vfork_catchpoint) (int);
 448     int (*to_remove_vfork_catchpoint) (int);
 449     int (*to_follow_fork) (struct target_ops *, int);
 450     void (*to_insert_exec_catchpoint) (int);
 451     int (*to_remove_exec_catchpoint) (int);
 452     int (*to_set_syscall_catchpoint) (int, int, int, int, int *);
 453     int (*to_has_exited) (int, int, int *);
 454     void (*to_mourn_inferior) (struct target_ops *);
 455     int (*to_can_run) (void);
 456     void (*to_notice_signals) (ptid_t ptid);
 457     int (*to_thread_alive) (struct target_ops *, ptid_t ptid);
 458     void (*to_find_new_threads) (struct target_ops *);
 459     char *(*to_pid_to_str) (struct target_ops *, ptid_t);
 460     char *(*to_extra_thread_info) (struct thread_info *);
 461     void (*to_stop) (ptid_t);
 462     void (*to_rcmd) (char *command, struct ui_file *output);
 463     char *(*to_pid_to_exec_file) (int pid);
 464     void (*to_log_command) (const char *);
 465     struct target_section_table *(*to_get_section_table) (struct target_ops *);
 466     enum strata to_stratum;
 467     int (*to_has_all_memory) (struct target_ops *);
 468     int (*to_has_memory) (struct target_ops *);
 469     int (*to_has_stack) (struct target_ops *);
 470     int (*to_has_registers) (struct target_ops *);
 471     int (*to_has_execution) (struct target_ops *);
 472     int to_has_thread_control;  /* control thread execution */
 473     int to_attach_no_wait;
 474     /* ASYNC target controls */
 475     int (*to_can_async_p) (void);
 476     int (*to_is_async_p) (void);
 477     void (*to_async) (void (*) (enum inferior_event_type, void *), void *);
 478     int (*to_async_mask) (int);
 479     int (*to_supports_non_stop) (void);
 480     /* find_memory_regions support method for gcore */
 481     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 482                                             unsigned long,
 483                                             int, int, int,
 484                                             void *),
 485                                    void *);
 486     /* make_corefile_notes support method for gcore */
 487     char * (*to_make_corefile_notes) (bfd *, int *);
 488     /* get_bookmark support method for bookmarks */
 489     gdb_byte * (*to_get_bookmark) (char *, int);
 490     /* goto_bookmark support method for bookmarks */
 491     void (*to_goto_bookmark) (gdb_byte *, int);
 492     /* Return the thread-local address at OFFSET in the
 493        thread-local storage for the thread PTID and the shared library
 494        or executable file given by OBJFILE.  If that block of
 495        thread-local storage hasn't been allocated yet, this function
 496        may return an error.  */
 497     CORE_ADDR (*to_get_thread_local_address) (struct target_ops *ops,
 498                                               ptid_t ptid,
 499                                               CORE_ADDR load_module_addr,
 500                                               CORE_ADDR offset);
 501
 502     /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 503        OBJECT.  The OFFSET, for a seekable object, specifies the
 504        starting point.  The ANNEX can be used to provide additional
 505        data-specific information to the target.
 506
 507        Return the number of bytes actually transfered, zero when no
 508        further transfer is possible, and -1 when the transfer is not
 509        supported.  Return of a positive value smaller than LEN does
 510        not indicate the end of the object, only the end of the
 511        transfer; higher level code should continue transferring if
 512        desired.  This is handled in target.c.
 513
 514        The interface does not support a "retry" mechanism.  Instead it
 515        assumes that at least one byte will be transfered on each
 516        successful call.
 517
 518        NOTE: cagney/2003-10-17: The current interface can lead to
 519        fragmented transfers.  Lower target levels should not implement
 520        hacks, such as enlarging the transfer, in an attempt to
 521        compensate for this.  Instead, the target stack should be
 522        extended so that it implements supply/collect methods and a
 523        look-aside object cache.  With that available, the lowest
 524        target can safely and freely "push" data up the stack.
 525
 526        See target_read and target_write for more information.  One,
 527        and only one, of readbuf or writebuf must be non-NULL.  */
 528
 529     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 530                                 enum target_object object, const char *annex,
 531                                 gdb_byte *readbuf, const gdb_byte *writebuf,
 532                                 ULONGEST offset, LONGEST len);
 533
 534     /* Returns the memory map for the target.  A return value of NULL
 535        means that no memory map is available.  If a memory address
 536        does not fall within any returned regions, it's assumed to be
 537        RAM.  The returned memory regions should not overlap.
 538
 539        The order of regions does not matter; target_memory_map will
 540        sort regions by starting address. For that reason, this
 541        function should not be called directly except via
 542        target_memory_map.
 543
 544        This method should not cache data; if the memory map could
 545        change unexpectedly, it should be invalidated, and higher
 546        layers will re-fetch it.  */
 547     VEC(mem_region_s) *(*to_memory_map) (struct target_ops *);
 548
 549     /* Erases the region of flash memory starting at ADDRESS, of
 550        length LENGTH.
 551
 552        Precondition: both ADDRESS and ADDRESS+LENGTH should be aligned
 553        on flash block boundaries, as reported by 'to_memory_map'.  */
 554     void (*to_flash_erase) (struct target_ops *,
 555                            ULONGEST address, LONGEST length);
 556
 557     /* Finishes a flash memory write sequence.  After this operation
 558        all flash memory should be available for writing and the result
 559        of reading from areas written by 'to_flash_write' should be
 560        equal to what was written.  */
 561     void (*to_flash_done) (struct target_ops *);
 562
 563     /* Describe the architecture-specific features of this target.
 564        Returns the description found, or NULL if no description
 565        was available.  */
 566     const struct target_desc *(*to_read_description) (struct target_ops *ops);
 567
 568     /* Build the PTID of the thread on which a given task is running,
 569        based on LWP and THREAD.  These values are extracted from the
 570        task Private_Data section of the Ada Task Control Block, and
 571        their interpretation depends on the target.  */
 572     ptid_t (*to_get_ada_task_ptid) (long lwp, long thread);
 573
 574     /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
 575        Return 0 if *READPTR is already at the end of the buffer.
 576        Return -1 if there is insufficient buffer for a whole entry.
 577        Return 1 if an entry was read into *TYPEP and *VALP.  */
 578     int (*to_auxv_parse) (struct target_ops *ops, gdb_byte **readptr,
 579                          gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp);
 580
 581     /* Search SEARCH_SPACE_LEN bytes beginning at START_ADDR for the
 582        sequence of bytes in PATTERN with length PATTERN_LEN.
 583
 584        The result is 1 if found, 0 if not found, and -1 if there was an error
 585        requiring halting of the search (e.g. memory read error).
 586        If the pattern is found the address is recorded in FOUND_ADDRP.  */
 587     int (*to_search_memory) (struct target_ops *ops,
 588                              CORE_ADDR start_addr, ULONGEST search_space_len,
 589                              const gdb_byte *pattern, ULONGEST pattern_len,
 590                              CORE_ADDR *found_addrp);
 591
 592     /* Can target execute in reverse?  */
 593     int (*to_can_execute_reverse) (void);
 594
 595     /* Does this target support debugging multiple processes
 596        simultaneously?  */
 597     int (*to_supports_multi_process) (void);
 598
 599     /* Determine current architecture of thread PTID.
 600
 601        The target is supposed to determine the architecture of the code where
 602        the target is currently stopped at (on Cell, if a target is in spu_run,
 603        to_thread_architecture would return SPU, otherwise PPC32 or PPC64).
 604        This is architecture used to perform decr_pc_after_break adjustment,
 605        and also determines the frame architecture of the innermost frame.
 606        ptrace operations need to operate according to target_gdbarch.
 607
 608        The default implementation always returns target_gdbarch.  */
 609     struct gdbarch *(*to_thread_architecture) (struct target_ops *, ptid_t);
 610
 611     /* Determine current address space of thread PTID.
 612
 613        The default implementation always returns the inferior's
 614        address space.  */
 615     struct address_space *(*to_thread_address_space) (struct target_ops *,
 616                                                       ptid_t);
 617
 618     /* Tracepoint-related operations.  */
 619
 620     /* Prepare the target for a tracing run.  */
 621     void (*to_trace_init) (void);
 622
 623     /* Send full details of a tracepoint to the target.  */
 624     void (*to_download_tracepoint) (struct breakpoint *t);
 625
 626     /* Send full details of a trace state variable to the target.  */
 627     void (*to_download_trace_state_variable) (struct trace_state_variable *tsv);
 628
 629     /* Inform the target info of memory regions that are readonly
 630        (such as text sections), and so it should return data from
 631        those rather than look in the trace buffer.  */
 632     void (*to_trace_set_readonly_regions) (void);
 633
 634     /* Start a trace run.  */
 635     void (*to_trace_start) (void);
 636
 637     /* Get the current status of a tracing run.  */
 638     int (*to_get_trace_status) (struct trace_status *ts);
 639
 640     /* Stop a trace run.  */
 641     void (*to_trace_stop) (void);
 642
 643    /* Ask the target to find a trace frame of the given type TYPE,
 644       using NUM, ADDR1, and ADDR2 as search parameters.  Returns the
 645       number of the trace frame, and also the tracepoint number at
 646       TPP.  If no trace frame matches, return -1. May throw if the
 647       operation fails.  */
 648     int (*to_trace_find) (enum trace_find_type type, int num,
 649                           ULONGEST addr1, ULONGEST addr2, int *tpp);
 650
 651     /* Get the value of the trace state variable number TSV, returning
 652        1 if the value is known and writing the value itself into the
 653        location pointed to by VAL, else returning 0.  */
 654     int (*to_get_trace_state_variable_value) (int tsv, LONGEST *val);
 655
 656     int (*to_save_trace_data) (const char *filename);
 657
 658     int (*to_upload_tracepoints) (struct uploaded_tp **utpp);
 659
 660     int (*to_upload_trace_state_variables) (struct uploaded_tsv **utsvp);
 661
 662     LONGEST (*to_get_raw_trace_data) (gdb_byte *buf,
 663                                       ULONGEST offset, LONGEST len);
 664
 665     /* Set the target's tracing behavior in response to unexpected
 666        disconnection - set VAL to 1 to keep tracing, 0 to stop.  */
 667     void (*to_set_disconnected_tracing) (int val);
 668     void (*to_set_circular_trace_buffer) (int val);
 669
 670     /* Return the processor core that thread PTID was last seen on.
 671        This information is updated only when:
 672        - update_thread_list is called
 673        - thread stops
 674        If the core cannot be determined -- either for the specified thread, or
 675        right now, or in this debug session, or for this target -- return -1.  */
 676     int (*to_core_of_thread) (struct target_ops *, ptid_t ptid);
 677
 678     /* Verify that the memory in the [MEMADDR, MEMADDR+SIZE) range
 679        matches the contents of [DATA,DATA+SIZE).  Returns 1 if there's
 680        a match, 0 if there's a mismatch, and -1 if an error is
 681        encountered while reading memory.  */
 682     int (*to_verify_memory) (struct target_ops *, const gdb_byte *data,
 683                              CORE_ADDR memaddr, ULONGEST size);
 684
 685     /* Return the address of the start of the Thread Information Block
 686        a Windows OS specific feature.  */
 687     int (*to_get_tib_address) (ptid_t ptid, CORE_ADDR *addr);
 688
 689     /* Send the new settings of write permission variables.  */
 690     void (*to_set_permissions) (void);
 691
 692     int to_magic;
 693     /* Need sub-structure for target machine related rather than comm related?
 694      */
 695   };
 696
 697 /* Magic number for checking ops size.  If a struct doesn't end with this
 698    number, somebody changed the declaration but didn't change all the
 699    places that initialize one.  */
 700
 701 #define OPS_MAGIC       3840
 702
 703 /* The ops structure for our "current" target process.  This should
 704    never be NULL.  If there is no target, it points to the dummy_target.  */
 705
 706 extern struct target_ops current_target;
 707
 708 /* Define easy words for doing these operations on our current target.  */
 709
 710 #define target_shortname        (current_target.to_shortname)
 711 #define target_longname         (current_target.to_longname)
 712
 713 /* Does whatever cleanup is required for a target that we are no
 714    longer going to be calling.  QUITTING indicates that GDB is exiting
 715    and should not get hung on an error (otherwise it is important to
 716    perform clean termination, even if it takes a while).  This routine
 717    is automatically always called when popping the target off the
 718    target stack (to_beneath is undefined).  Closing file descriptors
 719    and freeing all memory allocated memory are typical things it
 720    should do.  */
 721
 722 void target_close (struct target_ops *targ, int quitting);
 723
 724 /* Attaches to a process on the target side.  Arguments are as passed
 725    to the `attach' command by the user.  This routine can be called
 726    when the target is not on the target-stack, if the target_can_run
 727    routine returns 1; in that case, it must push itself onto the stack.
 728    Upon exit, the target should be ready for normal operations, and
 729    should be ready to deliver the status of the process immediately
 730    (without waiting) to an upcoming target_wait call.  */
 731
 732 void target_attach (char *, int);
 733
 734 /* Some targets don't generate traps when attaching to the inferior,
 735    or their target_attach implementation takes care of the waiting.
 736    These targets must set to_attach_no_wait.  */
 737
 738 #define target_attach_no_wait \
 739      (current_target.to_attach_no_wait)
 740
 741 /* The target_attach operation places a process under debugger control,
 742    and stops the process.
 743
 744    This operation provides a target-specific hook that allows the
 745    necessary bookkeeping to be performed after an attach completes.  */
 746 #define target_post_attach(pid) \
 747      (*current_target.to_post_attach) (pid)
 748
 749 /* Takes a program previously attached to and detaches it.
 750    The program may resume execution (some targets do, some don't) and will
 751    no longer stop on signals, etc.  We better not have left any breakpoints
 752    in the program or it'll die when it hits one.  ARGS is arguments
 753    typed by the user (e.g. a signal to send the process).  FROM_TTY
 754    says whether to be verbose or not.  */
 755
 756 extern void target_detach (char *, int);
 757
 758 /* Disconnect from the current target without resuming it (leaving it
 759    waiting for a debugger).  */
 760
 761 extern void target_disconnect (char *, int);
 762
 763 /* Resume execution of the target process PTID.  STEP says whether to
 764    single-step or to run free; SIGGNAL is the signal to be given to
 765    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 766    pass TARGET_SIGNAL_DEFAULT.  */
 767
 768 extern void target_resume (ptid_t ptid, int step, enum target_signal signal);
 769
 770 /* Wait for process pid to do something.  PTID = -1 to wait for any
 771    pid to do something.  Return pid of child, or -1 in case of error;
 772    store status through argument pointer STATUS.  Note that it is
 773    _NOT_ OK to throw_exception() out of target_wait() without popping
 774    the debugging target from the stack; GDB isn't prepared to get back
 775    to the prompt with a debugging target but without the frame cache,
 776    stop_pc, etc., set up.  OPTIONS is a bitwise OR of TARGET_W*
 777    options.  */
 778
 779 extern ptid_t target_wait (ptid_t ptid, struct target_waitstatus *status,
 780                            int options);
 781
 782 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 783
 784 extern void target_fetch_registers (struct regcache *regcache, int regno);
 785
 786 /* Store at least register REGNO, or all regs if REGNO == -1.
 787    It can store as many registers as it wants to, so target_prepare_to_store
 788    must have been previously called.  Calls error() if there are problems.  */
 789
 790 extern void target_store_registers (struct regcache *regcache, int regs);
 791
 792 /* Get ready to modify the registers array.  On machines which store
 793    individual registers, this doesn't need to do anything.  On machines
 794    which store all the registers in one fell swoop, this makes sure
 795    that REGISTERS contains all the registers from the program being
 796    debugged.  */
 797
 798 #define target_prepare_to_store(regcache)       \
 799      (*current_target.to_prepare_to_store) (regcache)
 800
 801 /* Determine current address space of thread PTID.  */
 802
 803 struct address_space *target_thread_address_space (ptid_t);
 804
 805 /* Returns true if this target can debug multiple processes
 806    simultaneously.  */
 807
 808 #define target_supports_multi_process() \
 809      (*current_target.to_supports_multi_process) ()
 810
 811 /* Invalidate all target dcaches.  */
 812 extern void target_dcache_invalidate (void);
 813
 814 extern int target_read_string (CORE_ADDR, char **, int, int *);
 815
 816 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 817
 818 extern int target_read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 819
 820 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 821                                 int len);
 822
 823 /* Fetches the target's memory map.  If one is found it is sorted
 824    and returned, after some consistency checking.  Otherwise, NULL
 825    is returned.  */
 826 VEC(mem_region_s) *target_memory_map (void);
 827
 828 /* Erase the specified flash region.  */
 829 void target_flash_erase (ULONGEST address, LONGEST length);
 830
 831 /* Finish a sequence of flash operations.  */
 832 void target_flash_done (void);
 833
 834 /* Describes a request for a memory write operation.  */
 835 struct memory_write_request
 836   {
 837     /* Begining address that must be written. */
 838     ULONGEST begin;
 839     /* Past-the-end address. */
 840     ULONGEST end;
 841     /* The data to write. */
 842     gdb_byte *data;
 843     /* A callback baton for progress reporting for this request.  */
 844     void *baton;
 845   };
 846 typedef struct memory_write_request memory_write_request_s;
 847 DEF_VEC_O(memory_write_request_s);
 848
 849 /* Enumeration specifying different flash preservation behaviour.  */
 850 enum flash_preserve_mode
 851   {
 852     flash_preserve,
 853     flash_discard
 854   };
 855
 856 /* Write several memory blocks at once.  This version can be more
 857    efficient than making several calls to target_write_memory, in
 858    particular because it can optimize accesses to flash memory.
 859
 860    Moreover, this is currently the only memory access function in gdb
 861    that supports writing to flash memory, and it should be used for
 862    all cases where access to flash memory is desirable.
 863
 864    REQUESTS is the vector (see vec.h) of memory_write_request.
 865    PRESERVE_FLASH_P indicates what to do with blocks which must be
 866      erased, but not completely rewritten.
 867    PROGRESS_CB is a function that will be periodically called to provide
 868      feedback to user.  It will be called with the baton corresponding
 869      to the request currently being written.  It may also be called
 870      with a NULL baton, when preserved flash sectors are being rewritten.
 871
 872    The function returns 0 on success, and error otherwise.  */
 873 int target_write_memory_blocks (VEC(memory_write_request_s) *requests,
 874                                 enum flash_preserve_mode preserve_flash_p,
 875                                 void (*progress_cb) (ULONGEST, void *));
 876
 877 /* From infrun.c.  */
 878
 879 extern int inferior_has_forked (ptid_t pid, ptid_t *child_pid);
 880
 881 extern int inferior_has_vforked (ptid_t pid, ptid_t *child_pid);
 882
 883 extern int inferior_has_execd (ptid_t pid, char **execd_pathname);
 884
 885 extern int inferior_has_called_syscall (ptid_t pid, int *syscall_number);
 886
 887 /* Print a line about the current target.  */
 888
 889 #define target_files_info()     \
 890      (*current_target.to_files_info) (&current_target)
 891
 892 /* Insert a breakpoint at address BP_TGT->placed_address in the target
 893    machine.  Result is 0 for success, or an errno value.  */
 894
 895 extern int target_insert_breakpoint (struct gdbarch *gdbarch,
 896                                      struct bp_target_info *bp_tgt);
 897
 898 /* Remove a breakpoint at address BP_TGT->placed_address in the target
 899    machine.  Result is 0 for success, or an errno value.  */
 900
 901 extern int target_remove_breakpoint (struct gdbarch *gdbarch,
 902                                      struct bp_target_info *bp_tgt);
 903
 904 /* Initialize the terminal settings we record for the inferior,
 905    before we actually run the inferior.  */
 906
 907 #define target_terminal_init() \
 908      (*current_target.to_terminal_init) ()
 909
 910 /* Put the inferior's terminal settings into effect.
 911    This is preparation for starting or resuming the inferior.  */
 912
 913 extern void target_terminal_inferior (void);
 914
 915 /* Put some of our terminal settings into effect,
 916    enough to get proper results from our output,
 917    but do not change into or out of RAW mode
 918    so that no input is discarded.
 919
 920    After doing this, either terminal_ours or terminal_inferior
 921    should be called to get back to a normal state of affairs.  */
 922
 923 #define target_terminal_ours_for_output() \
 924      (*current_target.to_terminal_ours_for_output) ()
 925
 926 /* Put our terminal settings into effect.
 927    First record the inferior's terminal settings
 928    so they can be restored properly later.  */
 929
 930 #define target_terminal_ours() \
 931      (*current_target.to_terminal_ours) ()
 932
 933 /* Save our terminal settings.
 934    This is called from TUI after entering or leaving the curses
 935    mode.  Since curses modifies our terminal this call is here
 936    to take this change into account.  */
 937
 938 #define target_terminal_save_ours() \
 939      (*current_target.to_terminal_save_ours) ()
 940
 941 /* Print useful information about our terminal status, if such a thing
 942    exists.  */
 943
 944 #define target_terminal_info(arg, from_tty) \
 945      (*current_target.to_terminal_info) (arg, from_tty)
 946
 947 /* Kill the inferior process.   Make it go away.  */
 948
 949 extern void target_kill (void);
 950
 951 /* Load an executable file into the target process.  This is expected
 952    to not only bring new code into the target process, but also to
 953    update GDB's symbol tables to match.
 954
 955    ARG contains command-line arguments, to be broken down with
 956    buildargv ().  The first non-switch argument is the filename to
 957    load, FILE; the second is a number (as parsed by strtoul (..., ...,
 958    0)), which is an offset to apply to the load addresses of FILE's
 959    sections.  The target may define switches, or other non-switch
 960    arguments, as it pleases.  */
 961
 962 extern void target_load (char *arg, int from_tty);
 963
 964 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 965    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 966    symbol should be returned.  The result is 0 if successful, nonzero
 967    if the symbol does not exist in the target environment.  This
 968    function should not call error() if communication with the target
 969    is interrupted, since it is called from symbol reading, but should
 970    return nonzero, possibly doing a complain().  */
 971
 972 #define target_lookup_symbol(name, addrp) \
 973      (*current_target.to_lookup_symbol) (name, addrp)
 974
 975 /* Start an inferior process and set inferior_ptid to its pid.
 976    EXEC_FILE is the file to run.
 977    ALLARGS is a string containing the arguments to the program.
 978    ENV is the environment vector to pass.  Errors reported with error().
 979    On VxWorks and various standalone systems, we ignore exec_file.  */
 980
 981 void target_create_inferior (char *exec_file, char *args,
 982                              char **env, int from_tty);
 983
 984 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 985    notification of inferior events such as fork and vork immediately
 986    after the inferior is created.  (This because of how gdb gets an
 987    inferior created via invoking a shell to do it.  In such a scenario,
 988    if the shell init file has commands in it, the shell will fork and
 989    exec for each of those commands, and we will see each such fork
 990    event.  Very bad.)
 991
 992    Such targets will supply an appropriate definition for this function.  */
 993
 994 #define target_post_startup_inferior(ptid) \
 995      (*current_target.to_post_startup_inferior) (ptid)
 996
 997 /* On some targets, the sequence of starting up an inferior requires
 998    some synchronization between gdb and the new inferior process, PID.  */
 999
1000 #define target_acknowledge_created_inferior(pid) \
1001      (*current_target.to_acknowledge_created_inferior) (pid)
1002
1003 /* On some targets, we can catch an inferior fork or vfork event when
1004    it occurs.  These functions insert/remove an already-created
1005    catchpoint for such events.  */
1006
1007 #define target_insert_fork_catchpoint(pid) \
1008      (*current_target.to_insert_fork_catchpoint) (pid)
1009
1010 #define target_remove_fork_catchpoint(pid) \
1011      (*current_target.to_remove_fork_catchpoint) (pid)
1012
1013 #define target_insert_vfork_catchpoint(pid) \
1014      (*current_target.to_insert_vfork_catchpoint) (pid)
1015
1016 #define target_remove_vfork_catchpoint(pid) \
1017      (*current_target.to_remove_vfork_catchpoint) (pid)
1018
1019 /* If the inferior forks or vforks, this function will be called at
1020    the next resume in order to perform any bookkeeping and fiddling
1021    necessary to continue debugging either the parent or child, as
1022    requested, and releasing the other.  Information about the fork
1023    or vfork event is available via get_last_target_status ().
1024    This function returns 1 if the inferior should not be resumed
1025    (i.e. there is another event pending).  */
1026
1027 int target_follow_fork (int follow_child);
1028
1029 /* On some targets, we can catch an inferior exec event when it
1030    occurs.  These functions insert/remove an already-created
1031    catchpoint for such events.  */
1032
1033 #define target_insert_exec_catchpoint(pid) \
1034      (*current_target.to_insert_exec_catchpoint) (pid)
1035
1036 #define target_remove_exec_catchpoint(pid) \
1037      (*current_target.to_remove_exec_catchpoint) (pid)
1038
1039 /* Syscall catch.
1040
1041    NEEDED is nonzero if any syscall catch (of any kind) is requested.
1042    If NEEDED is zero, it means the target can disable the mechanism to
1043    catch system calls because there are no more catchpoints of this type.
1044
1045    ANY_COUNT is nonzero if a generic (filter-less) syscall catch is
1046    being requested.  In this case, both TABLE_SIZE and TABLE should
1047    be ignored.
1048
1049    TABLE_SIZE is the number of elements in TABLE.  It only matters if
1050    ANY_COUNT is zero.
1051
1052    TABLE is an array of ints, indexed by syscall number.  An element in
1053    this array is nonzero if that syscall should be caught.  This argument
1054    only matters if ANY_COUNT is zero.  */
1055
1056 #define target_set_syscall_catchpoint(pid, needed, any_count, table_size, table) \
1057      (*current_target.to_set_syscall_catchpoint) (pid, needed, any_count, \
1058                                                   table_size, table)
1059
1060 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
1061    exit code of PID, if any.  */
1062
1063 #define target_has_exited(pid,wait_status,exit_status) \
1064      (*current_target.to_has_exited) (pid,wait_status,exit_status)
1065
1066 /* The debugger has completed a blocking wait() call.  There is now
1067    some process event that must be processed.  This function should
1068    be defined by those targets that require the debugger to perform
1069    cleanup or internal state changes in response to the process event.  */
1070
1071 /* The inferior process has died.  Do what is right.  */
1072
1073 void target_mourn_inferior (void);
1074
1075 /* Does target have enough data to do a run or attach command? */
1076
1077 #define target_can_run(t) \
1078      ((t)->to_can_run) ()
1079
1080 /* post process changes to signal handling in the inferior.  */
1081
1082 #define target_notice_signals(ptid) \
1083      (*current_target.to_notice_signals) (ptid)
1084
1085 /* Check to see if a thread is still alive.  */
1086
1087 extern int target_thread_alive (ptid_t ptid);
1088
1089 /* Query for new threads and add them to the thread list.  */
1090
1091 extern void target_find_new_threads (void);
1092
1093 /* Make target stop in a continuable fashion.  (For instance, under
1094    Unix, this should act like SIGSTOP).  This function is normally
1095    used by GUIs to implement a stop button.  */
1096
1097 extern void target_stop (ptid_t ptid);
1098
1099 /* Send the specified COMMAND to the target's monitor
1100    (shell,interpreter) for execution.  The result of the query is
1101    placed in OUTBUF.  */
1102
1103 #define target_rcmd(command, outbuf) \
1104      (*current_target.to_rcmd) (command, outbuf)
1105
1106
1107 /* Does the target include all of memory, or only part of it?  This
1108    determines whether we look up the target chain for other parts of
1109    memory if this target can't satisfy a request.  */
1110
1111 extern int target_has_all_memory_1 (void);
1112 #define target_has_all_memory target_has_all_memory_1 ()
1113
1114 /* Does the target include memory?  (Dummy targets don't.)  */
1115
1116 extern int target_has_memory_1 (void);
1117 #define target_has_memory target_has_memory_1 ()
1118
1119 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
1120    we start a process.)  */
1121
1122 extern int target_has_stack_1 (void);
1123 #define target_has_stack target_has_stack_1 ()
1124
1125 /* Does the target have registers?  (Exec files don't.)  */
1126
1127 extern int target_has_registers_1 (void);
1128 #define target_has_registers target_has_registers_1 ()
1129
1130 /* Does the target have execution?  Can we make it jump (through
1131    hoops), or pop its stack a few times?  This means that the current
1132    target is currently executing; for some targets, that's the same as
1133    whether or not the target is capable of execution, but there are
1134    also targets which can be current while not executing.  In that
1135    case this will become true after target_create_inferior or
1136    target_attach.  */
1137
1138 extern int target_has_execution_1 (void);
1139 #define target_has_execution target_has_execution_1 ()
1140
1141 /* Default implementations for process_stratum targets.  Return true
1142    if there's a selected inferior, false otherwise.  */
1143
1144 extern int default_child_has_all_memory (struct target_ops *ops);
1145 extern int default_child_has_memory (struct target_ops *ops);
1146 extern int default_child_has_stack (struct target_ops *ops);
1147 extern int default_child_has_registers (struct target_ops *ops);
1148 extern int default_child_has_execution (struct target_ops *ops);
1149
1150 /* Can the target support the debugger control of thread execution?
1151    Can it lock the thread scheduler?  */
1152
1153 #define target_can_lock_scheduler \
1154      (current_target.to_has_thread_control & tc_schedlock)
1155
1156 /* Should the target enable async mode if it is supported?  Temporary
1157    cludge until async mode is a strict superset of sync mode.  */
1158 extern int target_async_permitted;
1159
1160 /* Can the target support asynchronous execution? */
1161 #define target_can_async_p() (current_target.to_can_async_p ())
1162
1163 /* Is the target in asynchronous execution mode? */
1164 #define target_is_async_p() (current_target.to_is_async_p ())
1165
1166 int target_supports_non_stop (void);
1167
1168 /* Put the target in async mode with the specified callback function. */
1169 #define target_async(CALLBACK,CONTEXT) \
1170      (current_target.to_async ((CALLBACK), (CONTEXT)))
1171
1172 /* This is to be used ONLY within call_function_by_hand(). It provides
1173    a workaround, to have inferior function calls done in sychronous
1174    mode, even though the target is asynchronous. After
1175    target_async_mask(0) is called, calls to target_can_async_p() will
1176    return FALSE , so that target_resume() will not try to start the
1177    target asynchronously. After the inferior stops, we IMMEDIATELY
1178    restore the previous nature of the target, by calling
1179    target_async_mask(1). After that, target_can_async_p() will return
1180    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
1181
1182    FIXME ezannoni 1999-12-13: we won't need this once we move
1183    the turning async on and off to the single execution commands,
1184    from where it is done currently, in remote_resume().  */
1185
1186 #define target_async_mask(MASK) \
1187   (current_target.to_async_mask (MASK))
1188
1189 /* Converts a process id to a string.  Usually, the string just contains
1190    `process xyz', but on some systems it may contain
1191    `process xyz thread abc'.  */
1192
1193 extern char *target_pid_to_str (ptid_t ptid);
1194
1195 extern char *normal_pid_to_str (ptid_t ptid);
1196
1197 /* Return a short string describing extra information about PID,
1198    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
1199    is okay.  */
1200
1201 #define target_extra_thread_info(TP) \
1202      (current_target.to_extra_thread_info (TP))
1203
1204 /* Attempts to find the pathname of the executable file
1205    that was run to create a specified process.
1206
1207    The process PID must be stopped when this operation is used.
1208
1209    If the executable file cannot be determined, NULL is returned.
1210
1211    Else, a pointer to a character string containing the pathname
1212    is returned.  This string should be copied into a buffer by
1213    the client if the string will not be immediately used, or if
1214    it must persist.  */
1215
1216 #define target_pid_to_exec_file(pid) \
1217      (current_target.to_pid_to_exec_file) (pid)
1218
1219 /* See the to_thread_architecture description in struct target_ops.  */
1220
1221 #define target_thread_architecture(ptid) \
1222      (current_target.to_thread_architecture (&current_target, ptid))
1223
1224 /*
1225  * Iterator function for target memory regions.
1226  * Calls a callback function once for each memory region 'mapped'
1227  * in the child process.  Defined as a simple macro rather than
1228  * as a function macro so that it can be tested for nullity.
1229  */
1230
1231 #define target_find_memory_regions(FUNC, DATA) \
1232      (current_target.to_find_memory_regions) (FUNC, DATA)
1233
1234 /*
1235  * Compose corefile .note section.
1236  */
1237
1238 #define target_make_corefile_notes(BFD, SIZE_P) \
1239      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1240
1241 /* Bookmark interfaces.  */
1242 #define target_get_bookmark(ARGS, FROM_TTY) \
1243      (current_target.to_get_bookmark) (ARGS, FROM_TTY)
1244
1245 #define target_goto_bookmark(ARG, FROM_TTY) \
1246      (current_target.to_goto_bookmark) (ARG, FROM_TTY)
1247
1248 /* Hardware watchpoint interfaces.  */
1249
1250 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1251    write).  Only the INFERIOR_PTID task is being queried.  */
1252
1253 #define target_stopped_by_watchpoint \
1254    (*current_target.to_stopped_by_watchpoint)
1255
1256 /* Non-zero if we have steppable watchpoints  */
1257
1258 #define target_have_steppable_watchpoint \
1259    (current_target.to_have_steppable_watchpoint)
1260
1261 /* Non-zero if we have continuable watchpoints  */
1262
1263 #define target_have_continuable_watchpoint \
1264    (current_target.to_have_continuable_watchpoint)
1265
1266 /* Provide defaults for hardware watchpoint functions.  */
1267
1268 /* If the *_hw_beakpoint functions have not been defined
1269    elsewhere use the definitions in the target vector.  */
1270
1271 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1272    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1273    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1274    (including this one?).  OTHERTYPE is who knows what...  */
1275
1276 #define target_can_use_hardware_watchpoint(TYPE,CNT,OTHERTYPE) \
1277  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1278
1279 #define target_region_ok_for_hw_watchpoint(addr, len) \
1280     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1281
1282
1283 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.
1284    TYPE is 0 for write, 1 for read, and 2 for read/write accesses.
1285    Returns 0 for success, 1 if the watchpoint type is not supported,
1286    -1 for failure.  */
1287
1288 #define target_insert_watchpoint(addr, len, type)       \
1289      (*current_target.to_insert_watchpoint) (addr, len, type)
1290
1291 #define target_remove_watchpoint(addr, len, type)       \
1292      (*current_target.to_remove_watchpoint) (addr, len, type)
1293
1294 #define target_insert_hw_breakpoint(gdbarch, bp_tgt) \
1295      (*current_target.to_insert_hw_breakpoint) (gdbarch, bp_tgt)
1296
1297 #define target_remove_hw_breakpoint(gdbarch, bp_tgt) \
1298      (*current_target.to_remove_hw_breakpoint) (gdbarch, bp_tgt)
1299
1300 /* Return non-zero if target knows the data address which triggered this
1301    target_stopped_by_watchpoint, in such case place it to *ADDR_P.  Only the
1302    INFERIOR_PTID task is being queried.  */
1303 #define target_stopped_data_address(target, addr_p) \
1304     (*target.to_stopped_data_address) (target, addr_p)
1305
1306 #define target_watchpoint_addr_within_range(target, addr, start, length) \
1307   (*target.to_watchpoint_addr_within_range) (target, addr, start, length)
1308
1309 /* Target can execute in reverse?  */
1310 #define target_can_execute_reverse \
1311      (current_target.to_can_execute_reverse ? \
1312       current_target.to_can_execute_reverse () : 0)
1313
1314 extern const struct target_desc *target_read_description (struct target_ops *);
1315
1316 #define target_get_ada_task_ptid(lwp, tid) \
1317      (*current_target.to_get_ada_task_ptid) (lwp,tid)
1318
1319 /* Utility implementation of searching memory.  */
1320 extern int simple_search_memory (struct target_ops* ops,
1321                                  CORE_ADDR start_addr,
1322                                  ULONGEST search_space_len,
1323                                  const gdb_byte *pattern,
1324                                  ULONGEST pattern_len,
1325                                  CORE_ADDR *found_addrp);
1326
1327 /* Main entry point for searching memory.  */
1328 extern int target_search_memory (CORE_ADDR start_addr,
1329                                  ULONGEST search_space_len,
1330                                  const gdb_byte *pattern,
1331                                  ULONGEST pattern_len,
1332                                  CORE_ADDR *found_addrp);
1333
1334 /* Tracepoint-related operations.  */
1335
1336 #define target_trace_init() \
1337   (*current_target.to_trace_init) ()
1338
1339 #define target_download_tracepoint(t) \
1340   (*current_target.to_download_tracepoint) (t)
1341
1342 #define target_download_trace_state_variable(tsv) \
1343   (*current_target.to_download_trace_state_variable) (tsv)
1344
1345 #define target_trace_start() \
1346   (*current_target.to_trace_start) ()
1347
1348 #define target_trace_set_readonly_regions() \
1349   (*current_target.to_trace_set_readonly_regions) ()
1350
1351 #define target_get_trace_status(ts) \
1352   (*current_target.to_get_trace_status) (ts)
1353
1354 #define target_trace_stop() \
1355   (*current_target.to_trace_stop) ()
1356
1357 #define target_trace_find(type,num,addr1,addr2,tpp) \
1358   (*current_target.to_trace_find) ((type), (num), (addr1), (addr2), (tpp))
1359
1360 #define target_get_trace_state_variable_value(tsv,val) \
1361   (*current_target.to_get_trace_state_variable_value) ((tsv), (val))
1362
1363 #define target_save_trace_data(filename) \
1364   (*current_target.to_save_trace_data) (filename)
1365
1366 #define target_upload_tracepoints(utpp) \
1367   (*current_target.to_upload_tracepoints) (utpp)
1368
1369 #define target_upload_trace_state_variables(utsvp) \
1370   (*current_target.to_upload_trace_state_variables) (utsvp)
1371
1372 #define target_get_raw_trace_data(buf,offset,len) \
1373   (*current_target.to_get_raw_trace_data) ((buf), (offset), (len))
1374
1375 #define target_set_disconnected_tracing(val) \
1376   (*current_target.to_set_disconnected_tracing) (val)
1377
1378 #define target_set_circular_trace_buffer(val)   \
1379   (*current_target.to_set_circular_trace_buffer) (val)
1380
1381 #define target_get_tib_address(ptid, addr) \
1382   (*current_target.to_get_tib_address) ((ptid), (addr))
1383
1384 #define target_set_permissions() \
1385   (*current_target.to_set_permissions) ()
1386
1387 /* Command logging facility.  */
1388
1389 #define target_log_command(p)                                           \
1390   do                                                                    \
1391     if (current_target.to_log_command)                                  \
1392       (*current_target.to_log_command) (p);                             \
1393   while (0)
1394
1395
1396 extern int target_core_of_thread (ptid_t ptid);
1397
1398 /* Verify that the memory in the [MEMADDR, MEMADDR+SIZE) range matches
1399    the contents of [DATA,DATA+SIZE).  Returns 1 if there's a match, 0
1400    if there's a mismatch, and -1 if an error is encountered while
1401    reading memory.  Throws an error if the functionality is found not
1402    to be supported by the current target.  */
1403 int target_verify_memory (const gdb_byte *data,
1404                           CORE_ADDR memaddr, ULONGEST size);
1405
1406 /* Routines for maintenance of the target structures...
1407
1408    add_target:   Add a target to the list of all possible targets.
1409
1410    push_target:  Make this target the top of the stack of currently used
1411    targets, within its particular stratum of the stack.  Result
1412    is 0 if now atop the stack, nonzero if not on top (maybe
1413    should warn user).
1414
1415    unpush_target: Remove this from the stack of currently used targets,
1416    no matter where it is on the list.  Returns 0 if no
1417    change, 1 if removed from stack.
1418
1419    pop_target:   Remove the top thing on the stack of current targets.  */
1420
1421 extern void add_target (struct target_ops *);
1422
1423 extern void push_target (struct target_ops *);
1424
1425 extern int unpush_target (struct target_ops *);
1426
1427 extern void target_pre_inferior (int);
1428
1429 extern void target_preopen (int);
1430
1431 extern void pop_target (void);
1432
1433 /* Does whatever cleanup is required to get rid of all pushed targets.
1434    QUITTING is propagated to target_close; it indicates that GDB is
1435    exiting and should not get hung on an error (otherwise it is
1436    important to perform clean termination, even if it takes a
1437    while).  */
1438 extern void pop_all_targets (int quitting);
1439
1440 /* Like pop_all_targets, but pops only targets whose stratum is
1441    strictly above ABOVE_STRATUM.  */
1442 extern void pop_all_targets_above (enum strata above_stratum, int quitting);
1443
1444 extern CORE_ADDR target_translate_tls_address (struct objfile *objfile,
1445                                                CORE_ADDR offset);
1446
1447 /* Struct target_section maps address ranges to file sections.  It is
1448    mostly used with BFD files, but can be used without (e.g. for handling
1449    raw disks, or files not in formats handled by BFD).  */
1450
1451 struct target_section
1452   {
1453     CORE_ADDR addr;             /* Lowest address in section */
1454     CORE_ADDR endaddr;          /* 1+highest address in section */
1455
1456     struct bfd_section *the_bfd_section;
1457
1458     bfd *bfd;                   /* BFD file pointer */
1459   };
1460
1461 /* Holds an array of target sections.  Defined by [SECTIONS..SECTIONS_END[.  */
1462
1463 struct target_section_table
1464 {
1465   struct target_section *sections;
1466   struct target_section *sections_end;
1467 };
1468
1469 /* Return the "section" containing the specified address.  */
1470 struct target_section *target_section_by_addr (struct target_ops *target,
1471                                                CORE_ADDR addr);
1472
1473 /* Return the target section table this target (or the targets
1474    beneath) currently manipulate.  */
1475
1476 extern struct target_section_table *target_get_section_table
1477   (struct target_ops *target);
1478
1479 /* From mem-break.c */
1480
1481 extern int memory_remove_breakpoint (struct gdbarch *, struct bp_target_info *);
1482
1483 extern int memory_insert_breakpoint (struct gdbarch *, struct bp_target_info *);
1484
1485 extern int default_memory_remove_breakpoint (struct gdbarch *, struct bp_target_info *);
1486
1487 extern int default_memory_insert_breakpoint (struct gdbarch *, struct bp_target_info *);
1488
1489
1490 /* From target.c */
1491
1492 extern void initialize_targets (void);
1493
1494 extern void noprocess (void) ATTRIBUTE_NORETURN;
1495
1496 extern void target_require_runnable (void);
1497
1498 extern void find_default_attach (struct target_ops *, char *, int);
1499
1500 extern void find_default_create_inferior (struct target_ops *,
1501                                           char *, char *, char **, int);
1502
1503 extern struct target_ops *find_run_target (void);
1504
1505 extern struct target_ops *find_core_target (void);
1506
1507 extern struct target_ops *find_target_beneath (struct target_ops *);
1508
1509 /* Read OS data object of type TYPE from the target, and return it in
1510    XML format.  The result is NUL-terminated and returned as a string,
1511    allocated using xmalloc.  If an error occurs or the transfer is
1512    unsupported, NULL is returned.  Empty objects are returned as
1513    allocated but empty strings.  */
1514
1515 extern char *target_get_osdata (const char *type);
1516
1517 \f
1518 /* Stuff that should be shared among the various remote targets.  */
1519
1520 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1521    information (higher values, more information).  */
1522 extern int remote_debug;
1523
1524 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1525 extern int baud_rate;
1526 /* Timeout limit for response from target. */
1527 extern int remote_timeout;
1528
1529 \f
1530 /* Functions for helping to write a native target.  */
1531
1532 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1533 extern void store_waitstatus (struct target_waitstatus *, int);
1534
1535 /* These are in common/signals.c, but they're only used by gdb.  */
1536 extern enum target_signal default_target_signal_from_host (struct gdbarch *,
1537                                                            int);
1538 extern int default_target_signal_to_host (struct gdbarch *,
1539                                           enum target_signal);
1540
1541 /* Convert from a number used in a GDB command to an enum target_signal.  */
1542 extern enum target_signal target_signal_from_command (int);
1543 /* End of files in common/signals.c.  */
1544
1545 /* Set the show memory breakpoints mode to show, and installs a cleanup
1546    to restore it back to the current value.  */
1547 extern struct cleanup *make_show_memory_breakpoints_cleanup (int show);
1548
1549 extern int may_write_registers;
1550 extern int may_write_memory;
1551 extern int may_insert_breakpoints;
1552 extern int may_insert_tracepoints;
1553 extern int may_insert_fast_tracepoints;
1554 extern int may_stop;
1555
1556 extern void update_target_permissions (void);
1557
1558 \f
1559 /* Imported from machine dependent code */
1560
1561 /* Blank target vector entries are initialized to target_ignore. */
1562 void target_ignore (void);
1563
1564 extern struct target_ops deprecated_child_ops;
1565
1566 #endif /* !defined (TARGET_H) */