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 struct static_tracepoint_marker;
  39
  40 struct expression;
  41
  42 /* This include file defines the interface between the main part
  43    of the debugger, and the part which is target-specific, or
  44    specific to the communications interface between us and the
  45    target.
  46
  47    A TARGET is an interface between the debugger and a particular
  48    kind of file or process.  Targets can be STACKED in STRATA,
  49    so that more than one target can potentially respond to a request.
  50    In particular, memory accesses will walk down the stack of targets
  51    until they find a target that is interested in handling that particular
  52    address.  STRATA are artificial boundaries on the stack, within
  53    which particular kinds of targets live.  Strata exist so that
  54    people don't get confused by pushing e.g. a process target and then
  55    a file target, and wondering why they can't see the current values
  56    of variables any more (the file target is handling them and they
  57    never get to the process target).  So when you push a file target,
  58    it goes into the file stratum, which is always below the process
  59    stratum.  */
  60
  61 #include "bfd.h"
  62 #include "symtab.h"
  63 #include "memattr.h"
  64 #include "vec.h"
  65 #include "gdb_signals.h"
  66
  67 enum strata
  68   {
  69     dummy_stratum,              /* The lowest of the low */
  70     file_stratum,               /* Executable files, etc */
  71     process_stratum,            /* Executing processes or core dump files */
  72     thread_stratum,             /* Executing threads */
  73     record_stratum,             /* Support record debugging */
  74     arch_stratum                /* Architecture overrides */
  75   };
  76
  77 enum thread_control_capabilities
  78   {
  79     tc_none = 0,                /* Default: can't control thread execution.  */
  80     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  81   };
  82
  83 /* Stuff for target_wait.  */
  84
  85 /* Generally, what has the program done?  */
  86 enum target_waitkind
  87   {
  88     /* The program has exited.  The exit status is in value.integer.  */
  89     TARGET_WAITKIND_EXITED,
  90
  91     /* The program has stopped with a signal.  Which signal is in
  92        value.sig.  */
  93     TARGET_WAITKIND_STOPPED,
  94
  95     /* The program has terminated with a signal.  Which signal is in
  96        value.sig.  */
  97     TARGET_WAITKIND_SIGNALLED,
  98
  99     /* The program is letting us know that it dynamically loaded something
 100        (e.g. it called load(2) on AIX).  */
 101     TARGET_WAITKIND_LOADED,
 102
 103     /* The program has forked.  A "related" process' PTID is in
 104        value.related_pid.  I.e., if the child forks, value.related_pid
 105        is the parent's ID.  */
 106
 107     TARGET_WAITKIND_FORKED,
 108
 109     /* The program has vforked.  A "related" process's PTID is in
 110        value.related_pid.  */
 111
 112     TARGET_WAITKIND_VFORKED,
 113
 114     /* The program has exec'ed a new executable file.  The new file's
 115        pathname is pointed to by value.execd_pathname.  */
 116
 117     TARGET_WAITKIND_EXECD,
 118
 119     /* The program had previously vforked, and now the child is done
 120        with the shared memory region, because it exec'ed or exited.
 121        Note that the event is reported to the vfork parent.  This is
 122        only used if GDB did not stay attached to the vfork child,
 123        otherwise, a TARGET_WAITKIND_EXECD or
 124        TARGET_WAITKIND_EXIT|SIGNALLED event associated with the child
 125        has the same effect.  */
 126     TARGET_WAITKIND_VFORK_DONE,
 127
 128     /* The program has entered or returned from a system call.  On
 129        HP-UX, this is used in the hardware watchpoint implementation.
 130        The syscall's unique integer ID number is in value.syscall_id */
 131
 132     TARGET_WAITKIND_SYSCALL_ENTRY,
 133     TARGET_WAITKIND_SYSCALL_RETURN,
 134
 135     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 136        within target_wait, but I'm not sure target_wait should be resuming the
 137        inferior.  */
 138     TARGET_WAITKIND_SPURIOUS,
 139
 140     /* An event has occured, but we should wait again.
 141        Remote_async_wait() returns this when there is an event
 142        on the inferior, but the rest of the world is not interested in
 143        it. The inferior has not stopped, but has just sent some output
 144        to the console, for instance. In this case, we want to go back
 145        to the event loop and wait there for another event from the
 146        inferior, rather than being stuck in the remote_async_wait()
 147        function. This way the event loop is responsive to other events,
 148        like for instance the user typing.  */
 149     TARGET_WAITKIND_IGNORE,
 150
 151     /* The target has run out of history information,
 152        and cannot run backward any further.  */
 153     TARGET_WAITKIND_NO_HISTORY
 154   };
 155
 156 struct target_waitstatus
 157   {
 158     enum target_waitkind kind;
 159
 160     /* Forked child pid, execd pathname, exit status, signal number or
 161        syscall number.  */
 162     union
 163       {
 164         int integer;
 165         enum target_signal sig;
 166         ptid_t related_pid;
 167         char *execd_pathname;
 168         int syscall_number;
 169       }
 170     value;
 171   };
 172
 173 /* Options that can be passed to target_wait.  */
 174
 175 /* Return immediately if there's no event already queued.  If this
 176    options is not requested, target_wait blocks waiting for an
 177    event.  */
 178 #define TARGET_WNOHANG 1
 179
 180 /* The structure below stores information about a system call.
 181    It is basically used in the "catch syscall" command, and in
 182    every function that gives information about a system call.
 183
 184    It's also good to mention that its fields represent everything
 185    that we currently know about a syscall in GDB.  */
 186 struct syscall
 187   {
 188     /* The syscall number.  */
 189     int number;
 190
 191     /* The syscall name.  */
 192     const char *name;
 193   };
 194
 195 /* Return a pretty printed form of target_waitstatus.
 196    Space for the result is malloc'd, caller must free.  */
 197 extern char *target_waitstatus_to_string (const struct target_waitstatus *);
 198
 199 /* Possible types of events that the inferior handler will have to
 200    deal with.  */
 201 enum inferior_event_type
 202   {
 203     /* There is a request to quit the inferior, abandon it.  */
 204     INF_QUIT_REQ,
 205     /* Process a normal inferior event which will result in target_wait
 206        being called.  */
 207     INF_REG_EVENT,
 208     /* Deal with an error on the inferior.  */
 209     INF_ERROR,
 210     /* We are called because a timer went off.  */
 211     INF_TIMER,
 212     /* We are called to do stuff after the inferior stops.  */
 213     INF_EXEC_COMPLETE,
 214     /* We are called to do some stuff after the inferior stops, but we
 215        are expected to reenter the proceed() and
 216        handle_inferior_event() functions. This is used only in case of
 217        'step n' like commands.  */
 218     INF_EXEC_CONTINUE
 219   };
 220 \f
 221 /* Target objects which can be transfered using target_read,
 222    target_write, et cetera.  */
 223
 224 enum target_object
 225 {
 226   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 227   TARGET_OBJECT_AVR,
 228   /* SPU target specific transfer.  See "spu-tdep.c".  */
 229   TARGET_OBJECT_SPU,
 230   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 231   TARGET_OBJECT_MEMORY,
 232   /* Memory, avoiding GDB's data cache and trusting the executable.
 233      Target implementations of to_xfer_partial never need to handle
 234      this object, and most callers should not use it.  */
 235   TARGET_OBJECT_RAW_MEMORY,
 236   /* Memory known to be part of the target's stack.  This is cached even
 237      if it is not in a region marked as such, since it is known to be
 238      "normal" RAM.  */
 239   TARGET_OBJECT_STACK_MEMORY,
 240   /* Kernel Unwind Table.  See "ia64-tdep.c".  */
 241   TARGET_OBJECT_UNWIND_TABLE,
 242   /* Transfer auxilliary vector.  */
 243   TARGET_OBJECT_AUXV,
 244   /* StackGhost cookie.  See "sparc-tdep.c".  */
 245   TARGET_OBJECT_WCOOKIE,
 246   /* Target memory map in XML format.  */
 247   TARGET_OBJECT_MEMORY_MAP,
 248   /* Flash memory.  This object can be used to write contents to
 249      a previously erased flash memory.  Using it without erasing
 250      flash can have unexpected results.  Addresses are physical
 251      address on target, and not relative to flash start.  */
 252   TARGET_OBJECT_FLASH,
 253   /* Available target-specific features, e.g. registers and coprocessors.
 254      See "target-descriptions.c".  ANNEX should never be empty.  */
 255   TARGET_OBJECT_AVAILABLE_FEATURES,
 256   /* Currently loaded libraries, in XML format.  */
 257   TARGET_OBJECT_LIBRARIES,
 258   /* Get OS specific data.  The ANNEX specifies the type (running
 259      processes, etc.).  */
 260   TARGET_OBJECT_OSDATA,
 261   /* Extra signal info.  Usually the contents of `siginfo_t' on unix
 262      platforms.  */
 263   TARGET_OBJECT_SIGNAL_INFO,
 264   /* The list of threads that are being debugged.  */
 265   TARGET_OBJECT_THREADS,
 266   /* Collected static trace data.  */
 267   TARGET_OBJECT_STATIC_TRACE_DATA,
 268   /* Possible future objects: TARGET_OBJECT_FILE, ... */
 269 };
 270
 271 /* Enumeration of the kinds of traceframe searches that a target may
 272    be able to perform.  */
 273
 274 enum trace_find_type
 275   {
 276     tfind_number,
 277     tfind_pc,
 278     tfind_tp,
 279     tfind_range,
 280     tfind_outside,
 281   };
 282
 283 typedef struct static_tracepoint_marker *static_tracepoint_marker_p;
 284 DEF_VEC_P(static_tracepoint_marker_p);
 285
 286 /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 287    OBJECT.  The OFFSET, for a seekable object, specifies the
 288    starting point.  The ANNEX can be used to provide additional
 289    data-specific information to the target.
 290
 291    Return the number of bytes actually transfered, or -1 if the
 292    transfer is not supported or otherwise fails.  Return of a positive
 293    value less than LEN indicates that no further transfer is possible.
 294    Unlike the raw to_xfer_partial interface, callers of these
 295    functions do not need to retry partial transfers.  */
 296
 297 extern LONGEST target_read (struct target_ops *ops,
 298                             enum target_object object,
 299                             const char *annex, gdb_byte *buf,
 300                             ULONGEST offset, LONGEST len);
 301
 302 struct memory_read_result
 303   {
 304     /* First address that was read. */
 305     ULONGEST begin;
 306     /* Past-the-end address.  */
 307     ULONGEST end;
 308     /* The data.  */
 309     gdb_byte *data;
 310 };
 311 typedef struct memory_read_result memory_read_result_s;
 312 DEF_VEC_O(memory_read_result_s);
 313
 314 extern void free_memory_read_result_vector (void *);
 315
 316 extern VEC(memory_read_result_s)* read_memory_robust (struct target_ops *ops,
 317                                                       ULONGEST offset,
 318                                                       LONGEST len);
 319
 320 extern LONGEST target_write (struct target_ops *ops,
 321                              enum target_object object,
 322                              const char *annex, const gdb_byte *buf,
 323                              ULONGEST offset, LONGEST len);
 324
 325 /* Similar to target_write, except that it also calls PROGRESS with
 326    the number of bytes written and the opaque BATON after every
 327    successful partial write (and before the first write).  This is
 328    useful for progress reporting and user interaction while writing
 329    data.  To abort the transfer, the progress callback can throw an
 330    exception.  */
 331
 332 LONGEST target_write_with_progress (struct target_ops *ops,
 333                                     enum target_object object,
 334                                     const char *annex, const gdb_byte *buf,
 335                                     ULONGEST offset, LONGEST len,
 336                                     void (*progress) (ULONGEST, void *),
 337                                     void *baton);
 338
 339 /* Wrapper to perform a full read of unknown size.  OBJECT/ANNEX will
 340    be read using OPS.  The return value will be -1 if the transfer
 341    fails or is not supported; 0 if the object is empty; or the length
 342    of the object otherwise.  If a positive value is returned, a
 343    sufficiently large buffer will be allocated using xmalloc and
 344    returned in *BUF_P containing the contents of the object.
 345
 346    This method should be used for objects sufficiently small to store
 347    in a single xmalloc'd buffer, when no fixed bound on the object's
 348    size is known in advance.  Don't try to read TARGET_OBJECT_MEMORY
 349    through this function.  */
 350
 351 extern LONGEST target_read_alloc (struct target_ops *ops,
 352                                   enum target_object object,
 353                                   const char *annex, gdb_byte **buf_p);
 354
 355 /* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and
 356    returned as a string, allocated using xmalloc.  If an error occurs
 357    or the transfer is unsupported, NULL is returned.  Empty objects
 358    are returned as allocated but empty strings.  A warning is issued
 359    if the result contains any embedded NUL bytes.  */
 360
 361 extern char *target_read_stralloc (struct target_ops *ops,
 362                                    enum target_object object,
 363                                    const char *annex);
 364
 365 /* Wrappers to target read/write that perform memory transfers.  They
 366    throw an error if the memory transfer fails.
 367
 368    NOTE: cagney/2003-10-23: The naming schema is lifted from
 369    "frame.h".  The parameter order is lifted from get_frame_memory,
 370    which in turn lifted it from read_memory.  */
 371
 372 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 373                                gdb_byte *buf, LONGEST len);
 374 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 375                                             CORE_ADDR addr, int len,
 376                                             enum bfd_endian byte_order);
 377 \f
 378 struct thread_info;             /* fwd decl for parameter list below: */
 379
 380 struct target_ops
 381   {
 382     struct target_ops *beneath; /* To the target under this one.  */
 383     char *to_shortname;         /* Name this target type */
 384     char *to_longname;          /* Name for printing */
 385     char *to_doc;               /* Documentation.  Does not include trailing
 386                                    newline, and starts with a one-line descrip-
 387                                    tion (probably similar to to_longname).  */
 388     /* Per-target scratch pad.  */
 389     void *to_data;
 390     /* The open routine takes the rest of the parameters from the
 391        command, and (if successful) pushes a new target onto the
 392        stack.  Targets should supply this routine, if only to provide
 393        an error message.  */
 394     void (*to_open) (char *, int);
 395     /* Old targets with a static target vector provide "to_close".
 396        New re-entrant targets provide "to_xclose" and that is expected
 397        to xfree everything (including the "struct target_ops").  */
 398     void (*to_xclose) (struct target_ops *targ, int quitting);
 399     void (*to_close) (int);
 400     void (*to_attach) (struct target_ops *ops, char *, int);
 401     void (*to_post_attach) (int);
 402     void (*to_detach) (struct target_ops *ops, char *, int);
 403     void (*to_disconnect) (struct target_ops *, char *, int);
 404     void (*to_resume) (struct target_ops *, ptid_t, int, enum target_signal);
 405     ptid_t (*to_wait) (struct target_ops *,
 406                        ptid_t, struct target_waitstatus *, int);
 407     void (*to_fetch_registers) (struct target_ops *, struct regcache *, int);
 408     void (*to_store_registers) (struct target_ops *, struct regcache *, int);
 409     void (*to_prepare_to_store) (struct regcache *);
 410
 411     /* Transfer LEN bytes of memory between GDB address MYADDR and
 412        target address MEMADDR.  If WRITE, transfer them to the target, else
 413        transfer them from the target.  TARGET is the target from which we
 414        get this function.
 415
 416        Return value, N, is one of the following:
 417
 418        0 means that we can't handle this.  If errno has been set, it is the
 419        error which prevented us from doing it (FIXME: What about bfd_error?).
 420
 421        positive (call it N) means that we have transferred N bytes
 422        starting at MEMADDR.  We might be able to handle more bytes
 423        beyond this length, but no promises.
 424
 425        negative (call its absolute value N) means that we cannot
 426        transfer right at MEMADDR, but we could transfer at least
 427        something at MEMADDR + N.
 428
 429        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 430        to_xfer_partial and inferior inheritance.  */
 431
 432     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 433                                    int len, int write,
 434                                    struct mem_attrib *attrib,
 435                                    struct target_ops *target);
 436
 437     void (*to_files_info) (struct target_ops *);
 438     int (*to_insert_breakpoint) (struct gdbarch *, struct bp_target_info *);
 439     int (*to_remove_breakpoint) (struct gdbarch *, struct bp_target_info *);
 440     int (*to_can_use_hw_breakpoint) (int, int, int);
 441     int (*to_insert_hw_breakpoint) (struct gdbarch *, struct bp_target_info *);
 442     int (*to_remove_hw_breakpoint) (struct gdbarch *, struct bp_target_info *);
 443
 444     /* Documentation of what the two routines below are expected to do is
 445        provided with the corresponding target_* macros.  */
 446     int (*to_remove_watchpoint) (CORE_ADDR, int, int, struct expression *);
 447     int (*to_insert_watchpoint) (CORE_ADDR, int, int, struct expression *);
 448
 449     int (*to_stopped_by_watchpoint) (void);
 450     int to_have_steppable_watchpoint;
 451     int to_have_continuable_watchpoint;
 452     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 453     int (*to_watchpoint_addr_within_range) (struct target_ops *,
 454                                             CORE_ADDR, CORE_ADDR, int);
 455     int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);
 456     int (*to_can_accel_watchpoint_condition) (CORE_ADDR, int, int,
 457                                               struct expression *);
 458     void (*to_terminal_init) (void);
 459     void (*to_terminal_inferior) (void);
 460     void (*to_terminal_ours_for_output) (void);
 461     void (*to_terminal_ours) (void);
 462     void (*to_terminal_save_ours) (void);
 463     void (*to_terminal_info) (char *, int);
 464     void (*to_kill) (struct target_ops *);
 465     void (*to_load) (char *, int);
 466     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 467     void (*to_create_inferior) (struct target_ops *,
 468                                 char *, char *, char **, int);
 469     void (*to_post_startup_inferior) (ptid_t);
 470     void (*to_acknowledge_created_inferior) (int);
 471     void (*to_insert_fork_catchpoint) (int);
 472     int (*to_remove_fork_catchpoint) (int);
 473     void (*to_insert_vfork_catchpoint) (int);
 474     int (*to_remove_vfork_catchpoint) (int);
 475     int (*to_follow_fork) (struct target_ops *, int);
 476     void (*to_insert_exec_catchpoint) (int);
 477     int (*to_remove_exec_catchpoint) (int);
 478     int (*to_set_syscall_catchpoint) (int, int, int, int, int *);
 479     int (*to_has_exited) (int, int, int *);
 480     void (*to_mourn_inferior) (struct target_ops *);
 481     int (*to_can_run) (void);
 482     void (*to_notice_signals) (ptid_t ptid);
 483     int (*to_thread_alive) (struct target_ops *, ptid_t ptid);
 484     void (*to_find_new_threads) (struct target_ops *);
 485     char *(*to_pid_to_str) (struct target_ops *, ptid_t);
 486     char *(*to_extra_thread_info) (struct thread_info *);
 487     void (*to_stop) (ptid_t);
 488     void (*to_rcmd) (char *command, struct ui_file *output);
 489     char *(*to_pid_to_exec_file) (int pid);
 490     void (*to_log_command) (const char *);
 491     struct target_section_table *(*to_get_section_table) (struct target_ops *);
 492     enum strata to_stratum;
 493     int (*to_has_all_memory) (struct target_ops *);
 494     int (*to_has_memory) (struct target_ops *);
 495     int (*to_has_stack) (struct target_ops *);
 496     int (*to_has_registers) (struct target_ops *);
 497     int (*to_has_execution) (struct target_ops *);
 498     int to_has_thread_control;  /* control thread execution */
 499     int to_attach_no_wait;
 500     /* ASYNC target controls */
 501     int (*to_can_async_p) (void);
 502     int (*to_is_async_p) (void);
 503     void (*to_async) (void (*) (enum inferior_event_type, void *), void *);
 504     int (*to_async_mask) (int);
 505     int (*to_supports_non_stop) (void);
 506     /* find_memory_regions support method for gcore */
 507     int (*to_find_memory_regions) (find_memory_region_ftype func, void *data);
 508     /* make_corefile_notes support method for gcore */
 509     char * (*to_make_corefile_notes) (bfd *, int *);
 510     /* get_bookmark support method for bookmarks */
 511     gdb_byte * (*to_get_bookmark) (char *, int);
 512     /* goto_bookmark support method for bookmarks */
 513     void (*to_goto_bookmark) (gdb_byte *, int);
 514     /* Return the thread-local address at OFFSET in the
 515        thread-local storage for the thread PTID and the shared library
 516        or executable file given by OBJFILE.  If that block of
 517        thread-local storage hasn't been allocated yet, this function
 518        may return an error.  */
 519     CORE_ADDR (*to_get_thread_local_address) (struct target_ops *ops,
 520                                               ptid_t ptid,
 521                                               CORE_ADDR load_module_addr,
 522                                               CORE_ADDR offset);
 523
 524     /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 525        OBJECT.  The OFFSET, for a seekable object, specifies the
 526        starting point.  The ANNEX can be used to provide additional
 527        data-specific information to the target.
 528
 529        Return the number of bytes actually transfered, zero when no
 530        further transfer is possible, and -1 when the transfer is not
 531        supported.  Return of a positive value smaller than LEN does
 532        not indicate the end of the object, only the end of the
 533        transfer; higher level code should continue transferring if
 534        desired.  This is handled in target.c.
 535
 536        The interface does not support a "retry" mechanism.  Instead it
 537        assumes that at least one byte will be transfered on each
 538        successful call.
 539
 540        NOTE: cagney/2003-10-17: The current interface can lead to
 541        fragmented transfers.  Lower target levels should not implement
 542        hacks, such as enlarging the transfer, in an attempt to
 543        compensate for this.  Instead, the target stack should be
 544        extended so that it implements supply/collect methods and a
 545        look-aside object cache.  With that available, the lowest
 546        target can safely and freely "push" data up the stack.
 547
 548        See target_read and target_write for more information.  One,
 549        and only one, of readbuf or writebuf must be non-NULL.  */
 550
 551     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 552                                 enum target_object object, const char *annex,
 553                                 gdb_byte *readbuf, const gdb_byte *writebuf,
 554                                 ULONGEST offset, LONGEST len);
 555
 556     /* Returns the memory map for the target.  A return value of NULL
 557        means that no memory map is available.  If a memory address
 558        does not fall within any returned regions, it's assumed to be
 559        RAM.  The returned memory regions should not overlap.
 560
 561        The order of regions does not matter; target_memory_map will
 562        sort regions by starting address. For that reason, this
 563        function should not be called directly except via
 564        target_memory_map.
 565
 566        This method should not cache data; if the memory map could
 567        change unexpectedly, it should be invalidated, and higher
 568        layers will re-fetch it.  */
 569     VEC(mem_region_s) *(*to_memory_map) (struct target_ops *);
 570
 571     /* Erases the region of flash memory starting at ADDRESS, of
 572        length LENGTH.
 573
 574        Precondition: both ADDRESS and ADDRESS+LENGTH should be aligned
 575        on flash block boundaries, as reported by 'to_memory_map'.  */
 576     void (*to_flash_erase) (struct target_ops *,
 577                            ULONGEST address, LONGEST length);
 578
 579     /* Finishes a flash memory write sequence.  After this operation
 580        all flash memory should be available for writing and the result
 581        of reading from areas written by 'to_flash_write' should be
 582        equal to what was written.  */
 583     void (*to_flash_done) (struct target_ops *);
 584
 585     /* Describe the architecture-specific features of this target.
 586        Returns the description found, or NULL if no description
 587        was available.  */
 588     const struct target_desc *(*to_read_description) (struct target_ops *ops);
 589
 590     /* Build the PTID of the thread on which a given task is running,
 591        based on LWP and THREAD.  These values are extracted from the
 592        task Private_Data section of the Ada Task Control Block, and
 593        their interpretation depends on the target.  */
 594     ptid_t (*to_get_ada_task_ptid) (long lwp, long thread);
 595
 596     /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
 597        Return 0 if *READPTR is already at the end of the buffer.
 598        Return -1 if there is insufficient buffer for a whole entry.
 599        Return 1 if an entry was read into *TYPEP and *VALP.  */
 600     int (*to_auxv_parse) (struct target_ops *ops, gdb_byte **readptr,
 601                          gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp);
 602
 603     /* Search SEARCH_SPACE_LEN bytes beginning at START_ADDR for the
 604        sequence of bytes in PATTERN with length PATTERN_LEN.
 605
 606        The result is 1 if found, 0 if not found, and -1 if there was an error
 607        requiring halting of the search (e.g. memory read error).
 608        If the pattern is found the address is recorded in FOUND_ADDRP.  */
 609     int (*to_search_memory) (struct target_ops *ops,
 610                              CORE_ADDR start_addr, ULONGEST search_space_len,
 611                              const gdb_byte *pattern, ULONGEST pattern_len,
 612                              CORE_ADDR *found_addrp);
 613
 614     /* Can target execute in reverse?  */
 615     int (*to_can_execute_reverse) (void);
 616
 617     /* Does this target support debugging multiple processes
 618        simultaneously?  */
 619     int (*to_supports_multi_process) (void);
 620
 621     /* Determine current architecture of thread PTID.
 622
 623        The target is supposed to determine the architecture of the code where
 624        the target is currently stopped at (on Cell, if a target is in spu_run,
 625        to_thread_architecture would return SPU, otherwise PPC32 or PPC64).
 626        This is architecture used to perform decr_pc_after_break adjustment,
 627        and also determines the frame architecture of the innermost frame.
 628        ptrace operations need to operate according to target_gdbarch.
 629
 630        The default implementation always returns target_gdbarch.  */
 631     struct gdbarch *(*to_thread_architecture) (struct target_ops *, ptid_t);
 632
 633     /* Determine current address space of thread PTID.
 634
 635        The default implementation always returns the inferior's
 636        address space.  */
 637     struct address_space *(*to_thread_address_space) (struct target_ops *,
 638                                                       ptid_t);
 639
 640     /* Tracepoint-related operations.  */
 641
 642     /* Prepare the target for a tracing run.  */
 643     void (*to_trace_init) (void);
 644
 645     /* Send full details of a tracepoint to the target.  */
 646     void (*to_download_tracepoint) (struct breakpoint *t);
 647
 648     /* Send full details of a trace state variable to the target.  */
 649     void (*to_download_trace_state_variable) (struct trace_state_variable *tsv);
 650
 651     /* Inform the target info of memory regions that are readonly
 652        (such as text sections), and so it should return data from
 653        those rather than look in the trace buffer.  */
 654     void (*to_trace_set_readonly_regions) (void);
 655
 656     /* Start a trace run.  */
 657     void (*to_trace_start) (void);
 658
 659     /* Get the current status of a tracing run.  */
 660     int (*to_get_trace_status) (struct trace_status *ts);
 661
 662     /* Stop a trace run.  */
 663     void (*to_trace_stop) (void);
 664
 665    /* Ask the target to find a trace frame of the given type TYPE,
 666       using NUM, ADDR1, and ADDR2 as search parameters.  Returns the
 667       number of the trace frame, and also the tracepoint number at
 668       TPP.  If no trace frame matches, return -1. May throw if the
 669       operation fails.  */
 670     int (*to_trace_find) (enum trace_find_type type, int num,
 671                           ULONGEST addr1, ULONGEST addr2, int *tpp);
 672
 673     /* Get the value of the trace state variable number TSV, returning
 674        1 if the value is known and writing the value itself into the
 675        location pointed to by VAL, else returning 0.  */
 676     int (*to_get_trace_state_variable_value) (int tsv, LONGEST *val);
 677
 678     int (*to_save_trace_data) (const char *filename);
 679
 680     int (*to_upload_tracepoints) (struct uploaded_tp **utpp);
 681
 682     int (*to_upload_trace_state_variables) (struct uploaded_tsv **utsvp);
 683
 684     LONGEST (*to_get_raw_trace_data) (gdb_byte *buf,
 685                                       ULONGEST offset, LONGEST len);
 686
 687     /* Set the target's tracing behavior in response to unexpected
 688        disconnection - set VAL to 1 to keep tracing, 0 to stop.  */
 689     void (*to_set_disconnected_tracing) (int val);
 690     void (*to_set_circular_trace_buffer) (int val);
 691
 692     /* Return the processor core that thread PTID was last seen on.
 693        This information is updated only when:
 694        - update_thread_list is called
 695        - thread stops
 696        If the core cannot be determined -- either for the specified thread, or
 697        right now, or in this debug session, or for this target -- return -1.  */
 698     int (*to_core_of_thread) (struct target_ops *, ptid_t ptid);
 699
 700     /* Verify that the memory in the [MEMADDR, MEMADDR+SIZE) range
 701        matches the contents of [DATA,DATA+SIZE).  Returns 1 if there's
 702        a match, 0 if there's a mismatch, and -1 if an error is
 703        encountered while reading memory.  */
 704     int (*to_verify_memory) (struct target_ops *, const gdb_byte *data,
 705                              CORE_ADDR memaddr, ULONGEST size);
 706
 707     /* Return the address of the start of the Thread Information Block
 708        a Windows OS specific feature.  */
 709     int (*to_get_tib_address) (ptid_t ptid, CORE_ADDR *addr);
 710
 711     /* Send the new settings of write permission variables.  */
 712     void (*to_set_permissions) (void);
 713
 714     /* Look for a static tracepoint marker at ADDR, and fill in MARKER
 715        with its details.  Return 1 on success, 0 on failure.  */
 716     int (*to_static_tracepoint_marker_at) (CORE_ADDR,
 717                                            struct static_tracepoint_marker *marker);
 718
 719     /* Return a vector of all tracepoints markers string id ID, or all
 720        markers if ID is NULL.  */
 721     VEC(static_tracepoint_marker_p) *(*to_static_tracepoint_markers_by_strid)
 722       (const char *id);
 723
 724     int to_magic;
 725     /* Need sub-structure for target machine related rather than comm related?
 726      */
 727   };
 728
 729 /* Magic number for checking ops size.  If a struct doesn't end with this
 730    number, somebody changed the declaration but didn't change all the
 731    places that initialize one.  */
 732
 733 #define OPS_MAGIC       3840
 734
 735 /* The ops structure for our "current" target process.  This should
 736    never be NULL.  If there is no target, it points to the dummy_target.  */
 737
 738 extern struct target_ops current_target;
 739
 740 /* Define easy words for doing these operations on our current target.  */
 741
 742 #define target_shortname        (current_target.to_shortname)
 743 #define target_longname         (current_target.to_longname)
 744
 745 /* Does whatever cleanup is required for a target that we are no
 746    longer going to be calling.  QUITTING indicates that GDB is exiting
 747    and should not get hung on an error (otherwise it is important to
 748    perform clean termination, even if it takes a while).  This routine
 749    is automatically always called when popping the target off the
 750    target stack (to_beneath is undefined).  Closing file descriptors
 751    and freeing all memory allocated memory are typical things it
 752    should do.  */
 753
 754 void target_close (struct target_ops *targ, int quitting);
 755
 756 /* Attaches to a process on the target side.  Arguments are as passed
 757    to the `attach' command by the user.  This routine can be called
 758    when the target is not on the target-stack, if the target_can_run
 759    routine returns 1; in that case, it must push itself onto the stack.
 760    Upon exit, the target should be ready for normal operations, and
 761    should be ready to deliver the status of the process immediately
 762    (without waiting) to an upcoming target_wait call.  */
 763
 764 void target_attach (char *, int);
 765
 766 /* Some targets don't generate traps when attaching to the inferior,
 767    or their target_attach implementation takes care of the waiting.
 768    These targets must set to_attach_no_wait.  */
 769
 770 #define target_attach_no_wait \
 771      (current_target.to_attach_no_wait)
 772
 773 /* The target_attach operation places a process under debugger control,
 774    and stops the process.
 775
 776    This operation provides a target-specific hook that allows the
 777    necessary bookkeeping to be performed after an attach completes.  */
 778 #define target_post_attach(pid) \
 779      (*current_target.to_post_attach) (pid)
 780
 781 /* Takes a program previously attached to and detaches it.
 782    The program may resume execution (some targets do, some don't) and will
 783    no longer stop on signals, etc.  We better not have left any breakpoints
 784    in the program or it'll die when it hits one.  ARGS is arguments
 785    typed by the user (e.g. a signal to send the process).  FROM_TTY
 786    says whether to be verbose or not.  */
 787
 788 extern void target_detach (char *, int);
 789
 790 /* Disconnect from the current target without resuming it (leaving it
 791    waiting for a debugger).  */
 792
 793 extern void target_disconnect (char *, int);
 794
 795 /* Resume execution of the target process PTID.  STEP says whether to
 796    single-step or to run free; SIGGNAL is the signal to be given to
 797    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 798    pass TARGET_SIGNAL_DEFAULT.  */
 799
 800 extern void target_resume (ptid_t ptid, int step, enum target_signal signal);
 801
 802 /* Wait for process pid to do something.  PTID = -1 to wait for any
 803    pid to do something.  Return pid of child, or -1 in case of error;
 804    store status through argument pointer STATUS.  Note that it is
 805    _NOT_ OK to throw_exception() out of target_wait() without popping
 806    the debugging target from the stack; GDB isn't prepared to get back
 807    to the prompt with a debugging target but without the frame cache,
 808    stop_pc, etc., set up.  OPTIONS is a bitwise OR of TARGET_W*
 809    options.  */
 810
 811 extern ptid_t target_wait (ptid_t ptid, struct target_waitstatus *status,
 812                            int options);
 813
 814 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 815
 816 extern void target_fetch_registers (struct regcache *regcache, int regno);
 817
 818 /* Store at least register REGNO, or all regs if REGNO == -1.
 819    It can store as many registers as it wants to, so target_prepare_to_store
 820    must have been previously called.  Calls error() if there are problems.  */
 821
 822 extern void target_store_registers (struct regcache *regcache, int regs);
 823
 824 /* Get ready to modify the registers array.  On machines which store
 825    individual registers, this doesn't need to do anything.  On machines
 826    which store all the registers in one fell swoop, this makes sure
 827    that REGISTERS contains all the registers from the program being
 828    debugged.  */
 829
 830 #define target_prepare_to_store(regcache)       \
 831      (*current_target.to_prepare_to_store) (regcache)
 832
 833 /* Determine current address space of thread PTID.  */
 834
 835 struct address_space *target_thread_address_space (ptid_t);
 836
 837 /* Returns true if this target can debug multiple processes
 838    simultaneously.  */
 839
 840 #define target_supports_multi_process() \
 841      (*current_target.to_supports_multi_process) ()
 842
 843 /* Invalidate all target dcaches.  */
 844 extern void target_dcache_invalidate (void);
 845
 846 extern int target_read_string (CORE_ADDR, char **, int, int *);
 847
 848 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 849
 850 extern int target_read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 851
 852 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 853                                 int len);
 854
 855 /* Fetches the target's memory map.  If one is found it is sorted
 856    and returned, after some consistency checking.  Otherwise, NULL
 857    is returned.  */
 858 VEC(mem_region_s) *target_memory_map (void);
 859
 860 /* Erase the specified flash region.  */
 861 void target_flash_erase (ULONGEST address, LONGEST length);
 862
 863 /* Finish a sequence of flash operations.  */
 864 void target_flash_done (void);
 865
 866 /* Describes a request for a memory write operation.  */
 867 struct memory_write_request
 868   {
 869     /* Begining address that must be written. */
 870     ULONGEST begin;
 871     /* Past-the-end address. */
 872     ULONGEST end;
 873     /* The data to write. */
 874     gdb_byte *data;
 875     /* A callback baton for progress reporting for this request.  */
 876     void *baton;
 877   };
 878 typedef struct memory_write_request memory_write_request_s;
 879 DEF_VEC_O(memory_write_request_s);
 880
 881 /* Enumeration specifying different flash preservation behaviour.  */
 882 enum flash_preserve_mode
 883   {
 884     flash_preserve,
 885     flash_discard
 886   };
 887
 888 /* Write several memory blocks at once.  This version can be more
 889    efficient than making several calls to target_write_memory, in
 890    particular because it can optimize accesses to flash memory.
 891
 892    Moreover, this is currently the only memory access function in gdb
 893    that supports writing to flash memory, and it should be used for
 894    all cases where access to flash memory is desirable.
 895
 896    REQUESTS is the vector (see vec.h) of memory_write_request.
 897    PRESERVE_FLASH_P indicates what to do with blocks which must be
 898      erased, but not completely rewritten.
 899    PROGRESS_CB is a function that will be periodically called to provide
 900      feedback to user.  It will be called with the baton corresponding
 901      to the request currently being written.  It may also be called
 902      with a NULL baton, when preserved flash sectors are being rewritten.
 903
 904    The function returns 0 on success, and error otherwise.  */
 905 int target_write_memory_blocks (VEC(memory_write_request_s) *requests,
 906                                 enum flash_preserve_mode preserve_flash_p,
 907                                 void (*progress_cb) (ULONGEST, void *));
 908
 909 /* From infrun.c.  */
 910
 911 extern int inferior_has_forked (ptid_t pid, ptid_t *child_pid);
 912
 913 extern int inferior_has_vforked (ptid_t pid, ptid_t *child_pid);
 914
 915 extern int inferior_has_execd (ptid_t pid, char **execd_pathname);
 916
 917 extern int inferior_has_called_syscall (ptid_t pid, int *syscall_number);
 918
 919 /* Print a line about the current target.  */
 920
 921 #define target_files_info()     \
 922      (*current_target.to_files_info) (&current_target)
 923
 924 /* Insert a breakpoint at address BP_TGT->placed_address in the target
 925    machine.  Result is 0 for success, or an errno value.  */
 926
 927 extern int target_insert_breakpoint (struct gdbarch *gdbarch,
 928                                      struct bp_target_info *bp_tgt);
 929
 930 /* Remove a breakpoint at address BP_TGT->placed_address in the target
 931    machine.  Result is 0 for success, or an errno value.  */
 932
 933 extern int target_remove_breakpoint (struct gdbarch *gdbarch,
 934                                      struct bp_target_info *bp_tgt);
 935
 936 /* Initialize the terminal settings we record for the inferior,
 937    before we actually run the inferior.  */
 938
 939 #define target_terminal_init() \
 940      (*current_target.to_terminal_init) ()
 941
 942 /* Put the inferior's terminal settings into effect.
 943    This is preparation for starting or resuming the inferior.  */
 944
 945 extern void target_terminal_inferior (void);
 946
 947 /* Put some of our terminal settings into effect,
 948    enough to get proper results from our output,
 949    but do not change into or out of RAW mode
 950    so that no input is discarded.
 951
 952    After doing this, either terminal_ours or terminal_inferior
 953    should be called to get back to a normal state of affairs.  */
 954
 955 #define target_terminal_ours_for_output() \
 956      (*current_target.to_terminal_ours_for_output) ()
 957
 958 /* Put our terminal settings into effect.
 959    First record the inferior's terminal settings
 960    so they can be restored properly later.  */
 961
 962 #define target_terminal_ours() \
 963      (*current_target.to_terminal_ours) ()
 964
 965 /* Save our terminal settings.
 966    This is called from TUI after entering or leaving the curses
 967    mode.  Since curses modifies our terminal this call is here
 968    to take this change into account.  */
 969
 970 #define target_terminal_save_ours() \
 971      (*current_target.to_terminal_save_ours) ()
 972
 973 /* Print useful information about our terminal status, if such a thing
 974    exists.  */
 975
 976 #define target_terminal_info(arg, from_tty) \
 977      (*current_target.to_terminal_info) (arg, from_tty)
 978
 979 /* Kill the inferior process.   Make it go away.  */
 980
 981 extern void target_kill (void);
 982
 983 /* Load an executable file into the target process.  This is expected
 984    to not only bring new code into the target process, but also to
 985    update GDB's symbol tables to match.
 986
 987    ARG contains command-line arguments, to be broken down with
 988    buildargv ().  The first non-switch argument is the filename to
 989    load, FILE; the second is a number (as parsed by strtoul (..., ...,
 990    0)), which is an offset to apply to the load addresses of FILE's
 991    sections.  The target may define switches, or other non-switch
 992    arguments, as it pleases.  */
 993
 994 extern void target_load (char *arg, int from_tty);
 995
 996 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 997    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 998    symbol should be returned.  The result is 0 if successful, nonzero
 999    if the symbol does not exist in the target environment.  This
1000    function should not call error() if communication with the target
1001    is interrupted, since it is called from symbol reading, but should
1002    return nonzero, possibly doing a complain().  */
1003
1004 #define target_lookup_symbol(name, addrp) \
1005      (*current_target.to_lookup_symbol) (name, addrp)
1006
1007 /* Start an inferior process and set inferior_ptid to its pid.
1008    EXEC_FILE is the file to run.
1009    ALLARGS is a string containing the arguments to the program.
1010    ENV is the environment vector to pass.  Errors reported with error().
1011    On VxWorks and various standalone systems, we ignore exec_file.  */
1012
1013 void target_create_inferior (char *exec_file, char *args,
1014                              char **env, int from_tty);
1015
1016 /* Some targets (such as ttrace-based HPUX) don't allow us to request
1017    notification of inferior events such as fork and vork immediately
1018    after the inferior is created.  (This because of how gdb gets an
1019    inferior created via invoking a shell to do it.  In such a scenario,
1020    if the shell init file has commands in it, the shell will fork and
1021    exec for each of those commands, and we will see each such fork
1022    event.  Very bad.)
1023
1024    Such targets will supply an appropriate definition for this function.  */
1025
1026 #define target_post_startup_inferior(ptid) \
1027      (*current_target.to_post_startup_inferior) (ptid)
1028
1029 /* On some targets, the sequence of starting up an inferior requires
1030    some synchronization between gdb and the new inferior process, PID.  */
1031
1032 #define target_acknowledge_created_inferior(pid) \
1033      (*current_target.to_acknowledge_created_inferior) (pid)
1034
1035 /* On some targets, we can catch an inferior fork or vfork event when
1036    it occurs.  These functions insert/remove an already-created
1037    catchpoint for such events.  */
1038
1039 #define target_insert_fork_catchpoint(pid) \
1040      (*current_target.to_insert_fork_catchpoint) (pid)
1041
1042 #define target_remove_fork_catchpoint(pid) \
1043      (*current_target.to_remove_fork_catchpoint) (pid)
1044
1045 #define target_insert_vfork_catchpoint(pid) \
1046      (*current_target.to_insert_vfork_catchpoint) (pid)
1047
1048 #define target_remove_vfork_catchpoint(pid) \
1049      (*current_target.to_remove_vfork_catchpoint) (pid)
1050
1051 /* If the inferior forks or vforks, this function will be called at
1052    the next resume in order to perform any bookkeeping and fiddling
1053    necessary to continue debugging either the parent or child, as
1054    requested, and releasing the other.  Information about the fork
1055    or vfork event is available via get_last_target_status ().
1056    This function returns 1 if the inferior should not be resumed
1057    (i.e. there is another event pending).  */
1058
1059 int target_follow_fork (int follow_child);
1060
1061 /* On some targets, we can catch an inferior exec event when it
1062    occurs.  These functions insert/remove an already-created
1063    catchpoint for such events.  */
1064
1065 #define target_insert_exec_catchpoint(pid) \
1066      (*current_target.to_insert_exec_catchpoint) (pid)
1067
1068 #define target_remove_exec_catchpoint(pid) \
1069      (*current_target.to_remove_exec_catchpoint) (pid)
1070
1071 /* Syscall catch.
1072
1073    NEEDED is nonzero if any syscall catch (of any kind) is requested.
1074    If NEEDED is zero, it means the target can disable the mechanism to
1075    catch system calls because there are no more catchpoints of this type.
1076
1077    ANY_COUNT is nonzero if a generic (filter-less) syscall catch is
1078    being requested.  In this case, both TABLE_SIZE and TABLE should
1079    be ignored.
1080
1081    TABLE_SIZE is the number of elements in TABLE.  It only matters if
1082    ANY_COUNT is zero.
1083
1084    TABLE is an array of ints, indexed by syscall number.  An element in
1085    this array is nonzero if that syscall should be caught.  This argument
1086    only matters if ANY_COUNT is zero.  */
1087
1088 #define target_set_syscall_catchpoint(pid, needed, any_count, table_size, table) \
1089      (*current_target.to_set_syscall_catchpoint) (pid, needed, any_count, \
1090                                                   table_size, table)
1091
1092 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
1093    exit code of PID, if any.  */
1094
1095 #define target_has_exited(pid,wait_status,exit_status) \
1096      (*current_target.to_has_exited) (pid,wait_status,exit_status)
1097
1098 /* The debugger has completed a blocking wait() call.  There is now
1099    some process event that must be processed.  This function should
1100    be defined by those targets that require the debugger to perform
1101    cleanup or internal state changes in response to the process event.  */
1102
1103 /* The inferior process has died.  Do what is right.  */
1104
1105 void target_mourn_inferior (void);
1106
1107 /* Does target have enough data to do a run or attach command? */
1108
1109 #define target_can_run(t) \
1110      ((t)->to_can_run) ()
1111
1112 /* post process changes to signal handling in the inferior.  */
1113
1114 #define target_notice_signals(ptid) \
1115      (*current_target.to_notice_signals) (ptid)
1116
1117 /* Check to see if a thread is still alive.  */
1118
1119 extern int target_thread_alive (ptid_t ptid);
1120
1121 /* Query for new threads and add them to the thread list.  */
1122
1123 extern void target_find_new_threads (void);
1124
1125 /* Make target stop in a continuable fashion.  (For instance, under
1126    Unix, this should act like SIGSTOP).  This function is normally
1127    used by GUIs to implement a stop button.  */
1128
1129 extern void target_stop (ptid_t ptid);
1130
1131 /* Send the specified COMMAND to the target's monitor
1132    (shell,interpreter) for execution.  The result of the query is
1133    placed in OUTBUF.  */
1134
1135 #define target_rcmd(command, outbuf) \
1136      (*current_target.to_rcmd) (command, outbuf)
1137
1138
1139 /* Does the target include all of memory, or only part of it?  This
1140    determines whether we look up the target chain for other parts of
1141    memory if this target can't satisfy a request.  */
1142
1143 extern int target_has_all_memory_1 (void);
1144 #define target_has_all_memory target_has_all_memory_1 ()
1145
1146 /* Does the target include memory?  (Dummy targets don't.)  */
1147
1148 extern int target_has_memory_1 (void);
1149 #define target_has_memory target_has_memory_1 ()
1150
1151 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
1152    we start a process.)  */
1153
1154 extern int target_has_stack_1 (void);
1155 #define target_has_stack target_has_stack_1 ()
1156
1157 /* Does the target have registers?  (Exec files don't.)  */
1158
1159 extern int target_has_registers_1 (void);
1160 #define target_has_registers target_has_registers_1 ()
1161
1162 /* Does the target have execution?  Can we make it jump (through
1163    hoops), or pop its stack a few times?  This means that the current
1164    target is currently executing; for some targets, that's the same as
1165    whether or not the target is capable of execution, but there are
1166    also targets which can be current while not executing.  In that
1167    case this will become true after target_create_inferior or
1168    target_attach.  */
1169
1170 extern int target_has_execution_1 (void);
1171 #define target_has_execution target_has_execution_1 ()
1172
1173 /* Default implementations for process_stratum targets.  Return true
1174    if there's a selected inferior, false otherwise.  */
1175
1176 extern int default_child_has_all_memory (struct target_ops *ops);
1177 extern int default_child_has_memory (struct target_ops *ops);
1178 extern int default_child_has_stack (struct target_ops *ops);
1179 extern int default_child_has_registers (struct target_ops *ops);
1180 extern int default_child_has_execution (struct target_ops *ops);
1181
1182 /* Can the target support the debugger control of thread execution?
1183    Can it lock the thread scheduler?  */
1184
1185 #define target_can_lock_scheduler \
1186      (current_target.to_has_thread_control & tc_schedlock)
1187
1188 /* Should the target enable async mode if it is supported?  Temporary
1189    cludge until async mode is a strict superset of sync mode.  */
1190 extern int target_async_permitted;
1191
1192 /* Can the target support asynchronous execution? */
1193 #define target_can_async_p() (current_target.to_can_async_p ())
1194
1195 /* Is the target in asynchronous execution mode? */
1196 #define target_is_async_p() (current_target.to_is_async_p ())
1197
1198 int target_supports_non_stop (void);
1199
1200 /* Put the target in async mode with the specified callback function. */
1201 #define target_async(CALLBACK,CONTEXT) \
1202      (current_target.to_async ((CALLBACK), (CONTEXT)))
1203
1204 /* This is to be used ONLY within call_function_by_hand(). It provides
1205    a workaround, to have inferior function calls done in sychronous
1206    mode, even though the target is asynchronous. After
1207    target_async_mask(0) is called, calls to target_can_async_p() will
1208    return FALSE , so that target_resume() will not try to start the
1209    target asynchronously. After the inferior stops, we IMMEDIATELY
1210    restore the previous nature of the target, by calling
1211    target_async_mask(1). After that, target_can_async_p() will return
1212    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
1213
1214    FIXME ezannoni 1999-12-13: we won't need this once we move
1215    the turning async on and off to the single execution commands,
1216    from where it is done currently, in remote_resume().  */
1217
1218 #define target_async_mask(MASK) \
1219   (current_target.to_async_mask (MASK))
1220
1221 /* Converts a process id to a string.  Usually, the string just contains
1222    `process xyz', but on some systems it may contain
1223    `process xyz thread abc'.  */
1224
1225 extern char *target_pid_to_str (ptid_t ptid);
1226
1227 extern char *normal_pid_to_str (ptid_t ptid);
1228
1229 /* Return a short string describing extra information about PID,
1230    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
1231    is okay.  */
1232
1233 #define target_extra_thread_info(TP) \
1234      (current_target.to_extra_thread_info (TP))
1235
1236 /* Attempts to find the pathname of the executable file
1237    that was run to create a specified process.
1238
1239    The process PID must be stopped when this operation is used.
1240
1241    If the executable file cannot be determined, NULL is returned.
1242
1243    Else, a pointer to a character string containing the pathname
1244    is returned.  This string should be copied into a buffer by
1245    the client if the string will not be immediately used, or if
1246    it must persist.  */
1247
1248 #define target_pid_to_exec_file(pid) \
1249      (current_target.to_pid_to_exec_file) (pid)
1250
1251 /* See the to_thread_architecture description in struct target_ops.  */
1252
1253 #define target_thread_architecture(ptid) \
1254      (current_target.to_thread_architecture (&current_target, ptid))
1255
1256 /*
1257  * Iterator function for target memory regions.
1258  * Calls a callback function once for each memory region 'mapped'
1259  * in the child process.  Defined as a simple macro rather than
1260  * as a function macro so that it can be tested for nullity.
1261  */
1262
1263 #define target_find_memory_regions(FUNC, DATA) \
1264      (current_target.to_find_memory_regions) (FUNC, DATA)
1265
1266 /*
1267  * Compose corefile .note section.
1268  */
1269
1270 #define target_make_corefile_notes(BFD, SIZE_P) \
1271      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1272
1273 /* Bookmark interfaces.  */
1274 #define target_get_bookmark(ARGS, FROM_TTY) \
1275      (current_target.to_get_bookmark) (ARGS, FROM_TTY)
1276
1277 #define target_goto_bookmark(ARG, FROM_TTY) \
1278      (current_target.to_goto_bookmark) (ARG, FROM_TTY)
1279
1280 /* Hardware watchpoint interfaces.  */
1281
1282 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1283    write).  Only the INFERIOR_PTID task is being queried.  */
1284
1285 #define target_stopped_by_watchpoint \
1286    (*current_target.to_stopped_by_watchpoint)
1287
1288 /* Non-zero if we have steppable watchpoints  */
1289
1290 #define target_have_steppable_watchpoint \
1291    (current_target.to_have_steppable_watchpoint)
1292
1293 /* Non-zero if we have continuable watchpoints  */
1294
1295 #define target_have_continuable_watchpoint \
1296    (current_target.to_have_continuable_watchpoint)
1297
1298 /* Provide defaults for hardware watchpoint functions.  */
1299
1300 /* If the *_hw_beakpoint functions have not been defined
1301    elsewhere use the definitions in the target vector.  */
1302
1303 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1304    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1305    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1306    (including this one?).  OTHERTYPE is who knows what...  */
1307
1308 #define target_can_use_hardware_watchpoint(TYPE,CNT,OTHERTYPE) \
1309  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1310
1311 #define target_region_ok_for_hw_watchpoint(addr, len) \
1312     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1313
1314
1315 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.
1316    TYPE is 0 for write, 1 for read, and 2 for read/write accesses.
1317    COND is the expression for its condition, or NULL if there's none.
1318    Returns 0 for success, 1 if the watchpoint type is not supported,
1319    -1 for failure.  */
1320
1321 #define target_insert_watchpoint(addr, len, type, cond) \
1322      (*current_target.to_insert_watchpoint) (addr, len, type, cond)
1323
1324 #define target_remove_watchpoint(addr, len, type, cond) \
1325      (*current_target.to_remove_watchpoint) (addr, len, type, cond)
1326
1327 #define target_insert_hw_breakpoint(gdbarch, bp_tgt) \
1328      (*current_target.to_insert_hw_breakpoint) (gdbarch, bp_tgt)
1329
1330 #define target_remove_hw_breakpoint(gdbarch, bp_tgt) \
1331      (*current_target.to_remove_hw_breakpoint) (gdbarch, bp_tgt)
1332
1333 /* Return non-zero if target knows the data address which triggered this
1334    target_stopped_by_watchpoint, in such case place it to *ADDR_P.  Only the
1335    INFERIOR_PTID task is being queried.  */
1336 #define target_stopped_data_address(target, addr_p) \
1337     (*target.to_stopped_data_address) (target, addr_p)
1338
1339 #define target_watchpoint_addr_within_range(target, addr, start, length) \
1340   (*target.to_watchpoint_addr_within_range) (target, addr, start, length)
1341
1342 /* Return non-zero if the target is capable of using hardware to evaluate
1343    the condition expression.  In this case, if the condition is false when
1344    the watched memory location changes, execution may continue without the
1345    debugger being notified.
1346
1347    Due to limitations in the hardware implementation, it may be capable of
1348    avoiding triggering the watchpoint in some cases where the condition
1349    expression is false, but may report some false positives as well.
1350    For this reason, GDB will still evaluate the condition expression when
1351    the watchpoint triggers.  */
1352 #define target_can_accel_watchpoint_condition(addr, len, type, cond) \
1353   (*current_target.to_can_accel_watchpoint_condition) (addr, len, type, cond)
1354
1355 /* Target can execute in reverse?  */
1356 #define target_can_execute_reverse \
1357      (current_target.to_can_execute_reverse ? \
1358       current_target.to_can_execute_reverse () : 0)
1359
1360 extern const struct target_desc *target_read_description (struct target_ops *);
1361
1362 #define target_get_ada_task_ptid(lwp, tid) \
1363      (*current_target.to_get_ada_task_ptid) (lwp,tid)
1364
1365 /* Utility implementation of searching memory.  */
1366 extern int simple_search_memory (struct target_ops* ops,
1367                                  CORE_ADDR start_addr,
1368                                  ULONGEST search_space_len,
1369                                  const gdb_byte *pattern,
1370                                  ULONGEST pattern_len,
1371                                  CORE_ADDR *found_addrp);
1372
1373 /* Main entry point for searching memory.  */
1374 extern int target_search_memory (CORE_ADDR start_addr,
1375                                  ULONGEST search_space_len,
1376                                  const gdb_byte *pattern,
1377                                  ULONGEST pattern_len,
1378                                  CORE_ADDR *found_addrp);
1379
1380 /* Tracepoint-related operations.  */
1381
1382 #define target_trace_init() \
1383   (*current_target.to_trace_init) ()
1384
1385 #define target_download_tracepoint(t) \
1386   (*current_target.to_download_tracepoint) (t)
1387
1388 #define target_download_trace_state_variable(tsv) \
1389   (*current_target.to_download_trace_state_variable) (tsv)
1390
1391 #define target_trace_start() \
1392   (*current_target.to_trace_start) ()
1393
1394 #define target_trace_set_readonly_regions() \
1395   (*current_target.to_trace_set_readonly_regions) ()
1396
1397 #define target_get_trace_status(ts) \
1398   (*current_target.to_get_trace_status) (ts)
1399
1400 #define target_trace_stop() \
1401   (*current_target.to_trace_stop) ()
1402
1403 #define target_trace_find(type,num,addr1,addr2,tpp) \
1404   (*current_target.to_trace_find) ((type), (num), (addr1), (addr2), (tpp))
1405
1406 #define target_get_trace_state_variable_value(tsv,val) \
1407   (*current_target.to_get_trace_state_variable_value) ((tsv), (val))
1408
1409 #define target_save_trace_data(filename) \
1410   (*current_target.to_save_trace_data) (filename)
1411
1412 #define target_upload_tracepoints(utpp) \
1413   (*current_target.to_upload_tracepoints) (utpp)
1414
1415 #define target_upload_trace_state_variables(utsvp) \
1416   (*current_target.to_upload_trace_state_variables) (utsvp)
1417
1418 #define target_get_raw_trace_data(buf,offset,len) \
1419   (*current_target.to_get_raw_trace_data) ((buf), (offset), (len))
1420
1421 #define target_set_disconnected_tracing(val) \
1422   (*current_target.to_set_disconnected_tracing) (val)
1423
1424 #define target_set_circular_trace_buffer(val)   \
1425   (*current_target.to_set_circular_trace_buffer) (val)
1426
1427 #define target_get_tib_address(ptid, addr) \
1428   (*current_target.to_get_tib_address) ((ptid), (addr))
1429
1430 #define target_set_permissions() \
1431   (*current_target.to_set_permissions) ()
1432
1433 #define target_static_tracepoint_marker_at(addr, marker) \
1434   (*current_target.to_static_tracepoint_marker_at) (addr, marker)
1435
1436 #define target_static_tracepoint_markers_by_strid(marker_id) \
1437   (*current_target.to_static_tracepoint_markers_by_strid) (marker_id)
1438
1439 /* Command logging facility.  */
1440
1441 #define target_log_command(p)                                           \
1442   do                                                                    \
1443     if (current_target.to_log_command)                                  \
1444       (*current_target.to_log_command) (p);                             \
1445   while (0)
1446
1447
1448 extern int target_core_of_thread (ptid_t ptid);
1449
1450 /* Verify that the memory in the [MEMADDR, MEMADDR+SIZE) range matches
1451    the contents of [DATA,DATA+SIZE).  Returns 1 if there's a match, 0
1452    if there's a mismatch, and -1 if an error is encountered while
1453    reading memory.  Throws an error if the functionality is found not
1454    to be supported by the current target.  */
1455 int target_verify_memory (const gdb_byte *data,
1456                           CORE_ADDR memaddr, ULONGEST size);
1457
1458 /* Routines for maintenance of the target structures...
1459
1460    add_target:   Add a target to the list of all possible targets.
1461
1462    push_target:  Make this target the top of the stack of currently used
1463    targets, within its particular stratum of the stack.  Result
1464    is 0 if now atop the stack, nonzero if not on top (maybe
1465    should warn user).
1466
1467    unpush_target: Remove this from the stack of currently used targets,
1468    no matter where it is on the list.  Returns 0 if no
1469    change, 1 if removed from stack.
1470
1471    pop_target:   Remove the top thing on the stack of current targets.  */
1472
1473 extern void add_target (struct target_ops *);
1474
1475 extern void push_target (struct target_ops *);
1476
1477 extern int unpush_target (struct target_ops *);
1478
1479 extern void target_pre_inferior (int);
1480
1481 extern void target_preopen (int);
1482
1483 extern void pop_target (void);
1484
1485 /* Does whatever cleanup is required to get rid of all pushed targets.
1486    QUITTING is propagated to target_close; it indicates that GDB is
1487    exiting and should not get hung on an error (otherwise it is
1488    important to perform clean termination, even if it takes a
1489    while).  */
1490 extern void pop_all_targets (int quitting);
1491
1492 /* Like pop_all_targets, but pops only targets whose stratum is
1493    strictly above ABOVE_STRATUM.  */
1494 extern void pop_all_targets_above (enum strata above_stratum, int quitting);
1495
1496 extern int target_is_pushed (struct target_ops *t);
1497
1498 extern CORE_ADDR target_translate_tls_address (struct objfile *objfile,
1499                                                CORE_ADDR offset);
1500
1501 /* Struct target_section maps address ranges to file sections.  It is
1502    mostly used with BFD files, but can be used without (e.g. for handling
1503    raw disks, or files not in formats handled by BFD).  */
1504
1505 struct target_section
1506   {
1507     CORE_ADDR addr;             /* Lowest address in section */
1508     CORE_ADDR endaddr;          /* 1+highest address in section */
1509
1510     struct bfd_section *the_bfd_section;
1511
1512     bfd *bfd;                   /* BFD file pointer */
1513   };
1514
1515 /* Holds an array of target sections.  Defined by [SECTIONS..SECTIONS_END[.  */
1516
1517 struct target_section_table
1518 {
1519   struct target_section *sections;
1520   struct target_section *sections_end;
1521 };
1522
1523 /* Return the "section" containing the specified address.  */
1524 struct target_section *target_section_by_addr (struct target_ops *target,
1525                                                CORE_ADDR addr);
1526
1527 /* Return the target section table this target (or the targets
1528    beneath) currently manipulate.  */
1529
1530 extern struct target_section_table *target_get_section_table
1531   (struct target_ops *target);
1532
1533 /* From mem-break.c */
1534
1535 extern int memory_remove_breakpoint (struct gdbarch *, struct bp_target_info *);
1536
1537 extern int memory_insert_breakpoint (struct gdbarch *, struct bp_target_info *);
1538
1539 extern int default_memory_remove_breakpoint (struct gdbarch *, struct bp_target_info *);
1540
1541 extern int default_memory_insert_breakpoint (struct gdbarch *, struct bp_target_info *);
1542
1543
1544 /* From target.c */
1545
1546 extern void initialize_targets (void);
1547
1548 extern void noprocess (void) ATTRIBUTE_NORETURN;
1549
1550 extern void target_require_runnable (void);
1551
1552 extern void find_default_attach (struct target_ops *, char *, int);
1553
1554 extern void find_default_create_inferior (struct target_ops *,
1555                                           char *, char *, char **, int);
1556
1557 extern struct target_ops *find_run_target (void);
1558
1559 extern struct target_ops *find_target_beneath (struct target_ops *);
1560
1561 /* Read OS data object of type TYPE from the target, and return it in
1562    XML format.  The result is NUL-terminated and returned as a string,
1563    allocated using xmalloc.  If an error occurs or the transfer is
1564    unsupported, NULL is returned.  Empty objects are returned as
1565    allocated but empty strings.  */
1566
1567 extern char *target_get_osdata (const char *type);
1568
1569 \f
1570 /* Stuff that should be shared among the various remote targets.  */
1571
1572 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1573    information (higher values, more information).  */
1574 extern int remote_debug;
1575
1576 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1577 extern int baud_rate;
1578 /* Timeout limit for response from target. */
1579 extern int remote_timeout;
1580
1581 \f
1582 /* Functions for helping to write a native target.  */
1583
1584 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1585 extern void store_waitstatus (struct target_waitstatus *, int);
1586
1587 /* These are in common/signals.c, but they're only used by gdb.  */
1588 extern enum target_signal default_target_signal_from_host (struct gdbarch *,
1589                                                            int);
1590 extern int default_target_signal_to_host (struct gdbarch *,
1591                                           enum target_signal);
1592
1593 /* Convert from a number used in a GDB command to an enum target_signal.  */
1594 extern enum target_signal target_signal_from_command (int);
1595 /* End of files in common/signals.c.  */
1596
1597 /* Set the show memory breakpoints mode to show, and installs a cleanup
1598    to restore it back to the current value.  */
1599 extern struct cleanup *make_show_memory_breakpoints_cleanup (int show);
1600
1601 extern int may_write_registers;
1602 extern int may_write_memory;
1603 extern int may_insert_breakpoints;
1604 extern int may_insert_tracepoints;
1605 extern int may_insert_fast_tracepoints;
1606 extern int may_stop;
1607
1608 extern void update_target_permissions (void);
1609
1610 \f
1611 /* Imported from machine dependent code */
1612
1613 /* Blank target vector entries are initialized to target_ignore. */
1614 void target_ignore (void);
1615
1616 extern struct target_ops deprecated_child_ops;
1617
1618 #endif /* !defined (TARGET_H) */