gdb/target.h

   1 /* Interface between GDB and target environments, including files and processes
   2
   3    Copyright (C) 1990-2012 Free Software Foundation, Inc.
   4
   5    Contributed by Cygnus Support.  Written by John Gilmore.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #if !defined (TARGET_H)
  23 #define TARGET_H
  24
  25 struct objfile;
  26 struct ui_file;
  27 struct mem_attrib;
  28 struct target_ops;
  29 struct bp_location;
  30 struct bp_target_info;
  31 struct regcache;
  32 struct target_section_table;
  33 struct trace_state_variable;
  34 struct trace_status;
  35 struct uploaded_tsv;
  36 struct uploaded_tp;
  37 struct static_tracepoint_marker;
  38 struct traceframe_info;
  39 struct expression;
  40
  41 /* This include file defines the interface between the main part
  42    of the debugger, and the part which is target-specific, or
  43    specific to the communications interface between us and the
  44    target.
  45
  46    A TARGET is an interface between the debugger and a particular
  47    kind of file or process.  Targets can be STACKED in STRATA,
  48    so that more than one target can potentially respond to a request.
  49    In particular, memory accesses will walk down the stack of targets
  50    until they find a target that is interested in handling that particular
  51    address.  STRATA are artificial boundaries on the stack, within
  52    which particular kinds of targets live.  Strata exist so that
  53    people don't get confused by pushing e.g. a process target and then
  54    a file target, and wondering why they can't see the current values
  55    of variables any more (the file target is handling them and they
  56    never get to the process target).  So when you push a file target,
  57    it goes into the file stratum, which is always below the process
  58    stratum.  */
  59
  60 #include "bfd.h"
  61 #include "symtab.h"
  62 #include "memattr.h"
  63 #include "vec.h"
  64 #include "gdb_signals.h"
  65
  66 enum strata
  67   {
  68     dummy_stratum,              /* The lowest of the low */
  69     file_stratum,               /* Executable files, etc */
  70     process_stratum,            /* Executing processes or core dump files */
  71     thread_stratum,             /* Executing threads */
  72     record_stratum,             /* Support record debugging */
  73     arch_stratum                /* Architecture overrides */
  74   };
  75
  76 enum thread_control_capabilities
  77   {
  78     tc_none = 0,                /* Default: can't control thread execution.  */
  79     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  80   };
  81
  82 /* Stuff for target_wait.  */
  83
  84 /* Generally, what has the program done?  */
  85 enum target_waitkind
  86   {
  87     /* The program has exited.  The exit status is in value.integer.  */
  88     TARGET_WAITKIND_EXITED,
  89
  90     /* The program has stopped with a signal.  Which signal is in
  91        value.sig.  */
  92     TARGET_WAITKIND_STOPPED,
  93
  94     /* The program has terminated with a signal.  Which signal is in
  95        value.sig.  */
  96     TARGET_WAITKIND_SIGNALLED,
  97
  98     /* The program is letting us know that it dynamically loaded something
  99        (e.g. it called load(2) on AIX).  */
 100     TARGET_WAITKIND_LOADED,
 101
 102     /* The program has forked.  A "related" process' PTID is in
 103        value.related_pid.  I.e., if the child forks, value.related_pid
 104        is the parent's ID.  */
 105
 106     TARGET_WAITKIND_FORKED,
 107
 108     /* The program has vforked.  A "related" process's PTID is in
 109        value.related_pid.  */
 110
 111     TARGET_WAITKIND_VFORKED,
 112
 113     /* The program has exec'ed a new executable file.  The new file's
 114        pathname is pointed to by value.execd_pathname.  */
 115
 116     TARGET_WAITKIND_EXECD,
 117
 118     /* The program had previously vforked, and now the child is done
 119        with the shared memory region, because it exec'ed or exited.
 120        Note that the event is reported to the vfork parent.  This is
 121        only used if GDB did not stay attached to the vfork child,
 122        otherwise, a TARGET_WAITKIND_EXECD or
 123        TARGET_WAITKIND_EXIT|SIGNALLED event associated with the child
 124        has the same effect.  */
 125     TARGET_WAITKIND_VFORK_DONE,
 126
 127     /* The program has entered or returned from a system call.  On
 128        HP-UX, this is used in the hardware watchpoint implementation.
 129        The syscall's unique integer ID number is in value.syscall_id.  */
 130
 131     TARGET_WAITKIND_SYSCALL_ENTRY,
 132     TARGET_WAITKIND_SYSCALL_RETURN,
 133
 134     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 135        within target_wait, but I'm not sure target_wait should be resuming the
 136        inferior.  */
 137     TARGET_WAITKIND_SPURIOUS,
 138
 139     /* An event has occured, but we should wait again.
 140        Remote_async_wait() returns this when there is an event
 141        on the inferior, but the rest of the world is not interested in
 142        it.  The inferior has not stopped, but has just sent some output
 143        to the console, for instance.  In this case, we want to go back
 144        to the event loop and wait there for another event from the
 145        inferior, rather than being stuck in the remote_async_wait()
 146        function. sThis way the event loop is responsive to other events,
 147        like for instance the user typing.  */
 148     TARGET_WAITKIND_IGNORE,
 149
 150     /* The target has run out of history information,
 151        and cannot run backward any further.  */
 152     TARGET_WAITKIND_NO_HISTORY,
 153
 154     /* There are no resumed children left in the program.  */
 155     TARGET_WAITKIND_NO_RESUMED
 156   };
 157
 158 struct target_waitstatus
 159   {
 160     enum target_waitkind kind;
 161
 162     /* Forked child pid, execd pathname, exit status, signal number or
 163        syscall number.  */
 164     union
 165       {
 166         int integer;
 167         enum gdb_signal sig;
 168         ptid_t related_pid;
 169         char *execd_pathname;
 170         int syscall_number;
 171       }
 172     value;
 173   };
 174
 175 /* Options that can be passed to target_wait.  */
 176
 177 /* Return immediately if there's no event already queued.  If this
 178    options is not requested, target_wait blocks waiting for an
 179    event.  */
 180 #define TARGET_WNOHANG 1
 181
 182 /* The structure below stores information about a system call.
 183    It is basically used in the "catch syscall" command, and in
 184    every function that gives information about a system call.
 185
 186    It's also good to mention that its fields represent everything
 187    that we currently know about a syscall in GDB.  */
 188 struct syscall
 189   {
 190     /* The syscall number.  */
 191     int number;
 192
 193     /* The syscall name.  */
 194     const char *name;
 195   };
 196
 197 /* Return a pretty printed form of target_waitstatus.
 198    Space for the result is malloc'd, caller must free.  */
 199 extern char *target_waitstatus_to_string (const struct target_waitstatus *);
 200
 201 /* Possible types of events that the inferior handler will have to
 202    deal with.  */
 203 enum inferior_event_type
 204   {
 205     /* Process a normal inferior event which will result in target_wait
 206        being called.  */
 207     INF_REG_EVENT,
 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   /* Currently loaded libraries specific for SVR4 systems, in XML format.  */
 257   TARGET_OBJECT_LIBRARIES_SVR4,
 258   /* Get OS specific data.  The ANNEX specifies the type (running
 259      processes, etc.).  The data being transfered is expected to follow
 260      the DTD specified in features/osdata.dtd.  */
 261   TARGET_OBJECT_OSDATA,
 262   /* Extra signal info.  Usually the contents of `siginfo_t' on unix
 263      platforms.  */
 264   TARGET_OBJECT_SIGNAL_INFO,
 265   /* The list of threads that are being debugged.  */
 266   TARGET_OBJECT_THREADS,
 267   /* Collected static trace data.  */
 268   TARGET_OBJECT_STATIC_TRACE_DATA,
 269   /* The HP-UX registers (those that can be obtained or modified by using
 270      the TT_LWP_RUREGS/TT_LWP_WUREGS ttrace requests).  */
 271   TARGET_OBJECT_HPUX_UREGS,
 272   /* The HP-UX shared library linkage pointer.  ANNEX should be a string
 273      image of the code address whose linkage pointer we are looking for.
 274
 275      The size of the data transfered is always 8 bytes (the size of an
 276      address on ia64).  */
 277   TARGET_OBJECT_HPUX_SOLIB_GOT,
 278   /* Traceframe info, in XML format.  */
 279   TARGET_OBJECT_TRACEFRAME_INFO,
 280   /* Load maps for FDPIC systems.  */
 281   TARGET_OBJECT_FDPIC,
 282   /* Darwin dynamic linker info data.  */
 283   TARGET_OBJECT_DARWIN_DYLD_INFO,
 284   /* OpenVMS Unwind Information Block.  */
 285   TARGET_OBJECT_OPENVMS_UIB
 286   /* Possible future objects: TARGET_OBJECT_FILE, ...  */
 287 };
 288
 289 /* Enumeration of the kinds of traceframe searches that a target may
 290    be able to perform.  */
 291
 292 enum trace_find_type
 293   {
 294     tfind_number,
 295     tfind_pc,
 296     tfind_tp,
 297     tfind_range,
 298     tfind_outside,
 299   };
 300
 301 typedef struct static_tracepoint_marker *static_tracepoint_marker_p;
 302 DEF_VEC_P(static_tracepoint_marker_p);
 303
 304 /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 305    OBJECT.  The OFFSET, for a seekable object, specifies the
 306    starting point.  The ANNEX can be used to provide additional
 307    data-specific information to the target.
 308
 309    Return the number of bytes actually transfered, or -1 if the
 310    transfer is not supported or otherwise fails.  Return of a positive
 311    value less than LEN indicates that no further transfer is possible.
 312    Unlike the raw to_xfer_partial interface, callers of these
 313    functions do not need to retry partial transfers.  */
 314
 315 extern LONGEST target_read (struct target_ops *ops,
 316                             enum target_object object,
 317                             const char *annex, gdb_byte *buf,
 318                             ULONGEST offset, LONGEST len);
 319
 320 struct memory_read_result
 321   {
 322     /* First address that was read.  */
 323     ULONGEST begin;
 324     /* Past-the-end address.  */
 325     ULONGEST end;
 326     /* The data.  */
 327     gdb_byte *data;
 328 };
 329 typedef struct memory_read_result memory_read_result_s;
 330 DEF_VEC_O(memory_read_result_s);
 331
 332 extern void free_memory_read_result_vector (void *);
 333
 334 extern VEC(memory_read_result_s)* read_memory_robust (struct target_ops *ops,
 335                                                       ULONGEST offset,
 336                                                       LONGEST len);
 337
 338 extern LONGEST target_write (struct target_ops *ops,
 339                              enum target_object object,
 340                              const char *annex, const gdb_byte *buf,
 341                              ULONGEST offset, LONGEST len);
 342
 343 /* Similar to target_write, except that it also calls PROGRESS with
 344    the number of bytes written and the opaque BATON after every
 345    successful partial write (and before the first write).  This is
 346    useful for progress reporting and user interaction while writing
 347    data.  To abort the transfer, the progress callback can throw an
 348    exception.  */
 349
 350 LONGEST target_write_with_progress (struct target_ops *ops,
 351                                     enum target_object object,
 352                                     const char *annex, const gdb_byte *buf,
 353                                     ULONGEST offset, LONGEST len,
 354                                     void (*progress) (ULONGEST, void *),
 355                                     void *baton);
 356
 357 /* Wrapper to perform a full read of unknown size.  OBJECT/ANNEX will
 358    be read using OPS.  The return value will be -1 if the transfer
 359    fails or is not supported; 0 if the object is empty; or the length
 360    of the object otherwise.  If a positive value is returned, a
 361    sufficiently large buffer will be allocated using xmalloc and
 362    returned in *BUF_P containing the contents of the object.
 363
 364    This method should be used for objects sufficiently small to store
 365    in a single xmalloc'd buffer, when no fixed bound on the object's
 366    size is known in advance.  Don't try to read TARGET_OBJECT_MEMORY
 367    through this function.  */
 368
 369 extern LONGEST target_read_alloc (struct target_ops *ops,
 370                                   enum target_object object,
 371                                   const char *annex, gdb_byte **buf_p);
 372
 373 /* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and
 374    returned as a string, allocated using xmalloc.  If an error occurs
 375    or the transfer is unsupported, NULL is returned.  Empty objects
 376    are returned as allocated but empty strings.  A warning is issued
 377    if the result contains any embedded NUL bytes.  */
 378
 379 extern char *target_read_stralloc (struct target_ops *ops,
 380                                    enum target_object object,
 381                                    const char *annex);
 382
 383 /* Wrappers to target read/write that perform memory transfers.  They
 384    throw an error if the memory transfer fails.
 385
 386    NOTE: cagney/2003-10-23: The naming schema is lifted from
 387    "frame.h".  The parameter order is lifted from get_frame_memory,
 388    which in turn lifted it from read_memory.  */
 389
 390 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 391                                gdb_byte *buf, LONGEST len);
 392 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 393                                             CORE_ADDR addr, int len,
 394                                             enum bfd_endian byte_order);
 395 \f
 396 struct thread_info;             /* fwd decl for parameter list below: */
 397
 398 struct target_ops
 399   {
 400     struct target_ops *beneath; /* To the target under this one.  */
 401     char *to_shortname;         /* Name this target type */
 402     char *to_longname;          /* Name for printing */
 403     char *to_doc;               /* Documentation.  Does not include trailing
 404                                    newline, and starts with a one-line descrip-
 405                                    tion (probably similar to to_longname).  */
 406     /* Per-target scratch pad.  */
 407     void *to_data;
 408     /* The open routine takes the rest of the parameters from the
 409        command, and (if successful) pushes a new target onto the
 410        stack.  Targets should supply this routine, if only to provide
 411        an error message.  */
 412     void (*to_open) (char *, int);
 413     /* Old targets with a static target vector provide "to_close".
 414        New re-entrant targets provide "to_xclose" and that is expected
 415        to xfree everything (including the "struct target_ops").  */
 416     void (*to_xclose) (struct target_ops *targ, int quitting);
 417     void (*to_close) (int);
 418     void (*to_attach) (struct target_ops *ops, char *, int);
 419     void (*to_post_attach) (int);
 420     void (*to_detach) (struct target_ops *ops, char *, int);
 421     void (*to_disconnect) (struct target_ops *, char *, int);
 422     void (*to_resume) (struct target_ops *, ptid_t, int, enum gdb_signal);
 423     ptid_t (*to_wait) (struct target_ops *,
 424                        ptid_t, struct target_waitstatus *, int);
 425     void (*to_fetch_registers) (struct target_ops *, struct regcache *, int);
 426     void (*to_store_registers) (struct target_ops *, struct regcache *, int);
 427     void (*to_prepare_to_store) (struct regcache *);
 428
 429     /* Transfer LEN bytes of memory between GDB address MYADDR and
 430        target address MEMADDR.  If WRITE, transfer them to the target, else
 431        transfer them from the target.  TARGET is the target from which we
 432        get this function.
 433
 434        Return value, N, is one of the following:
 435
 436        0 means that we can't handle this.  If errno has been set, it is the
 437        error which prevented us from doing it (FIXME: What about bfd_error?).
 438
 439        positive (call it N) means that we have transferred N bytes
 440        starting at MEMADDR.  We might be able to handle more bytes
 441        beyond this length, but no promises.
 442
 443        negative (call its absolute value N) means that we cannot
 444        transfer right at MEMADDR, but we could transfer at least
 445        something at MEMADDR + N.
 446
 447        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 448        to_xfer_partial and inferior inheritance.  */
 449
 450     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 451                                    int len, int write,
 452                                    struct mem_attrib *attrib,
 453                                    struct target_ops *target);
 454
 455     void (*to_files_info) (struct target_ops *);
 456     int (*to_insert_breakpoint) (struct gdbarch *, struct bp_target_info *);
 457     int (*to_remove_breakpoint) (struct gdbarch *, struct bp_target_info *);
 458     int (*to_can_use_hw_breakpoint) (int, int, int);
 459     int (*to_ranged_break_num_registers) (struct target_ops *);
 460     int (*to_insert_hw_breakpoint) (struct gdbarch *, struct bp_target_info *);
 461     int (*to_remove_hw_breakpoint) (struct gdbarch *, struct bp_target_info *);
 462
 463     /* Documentation of what the two routines below are expected to do is
 464        provided with the corresponding target_* macros.  */
 465     int (*to_remove_watchpoint) (CORE_ADDR, int, int, struct expression *);
 466     int (*to_insert_watchpoint) (CORE_ADDR, int, int, struct expression *);
 467
 468     int (*to_insert_mask_watchpoint) (struct target_ops *,
 469                                       CORE_ADDR, CORE_ADDR, int);
 470     int (*to_remove_mask_watchpoint) (struct target_ops *,
 471                                       CORE_ADDR, CORE_ADDR, int);
 472     int (*to_stopped_by_watchpoint) (void);
 473     int to_have_steppable_watchpoint;
 474     int to_have_continuable_watchpoint;
 475     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 476     int (*to_watchpoint_addr_within_range) (struct target_ops *,
 477                                             CORE_ADDR, CORE_ADDR, int);
 478
 479     /* Documentation of this routine is provided with the corresponding
 480        target_* macro.  */
 481     int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);
 482
 483     int (*to_can_accel_watchpoint_condition) (CORE_ADDR, int, int,
 484                                               struct expression *);
 485     int (*to_masked_watch_num_registers) (struct target_ops *,
 486                                           CORE_ADDR, CORE_ADDR);
 487     void (*to_terminal_init) (void);
 488     void (*to_terminal_inferior) (void);
 489     void (*to_terminal_ours_for_output) (void);
 490     void (*to_terminal_ours) (void);
 491     void (*to_terminal_save_ours) (void);
 492     void (*to_terminal_info) (char *, int);
 493     void (*to_kill) (struct target_ops *);
 494     void (*to_load) (char *, int);
 495     void (*to_create_inferior) (struct target_ops *,
 496                                 char *, char *, char **, int);
 497     void (*to_post_startup_inferior) (ptid_t);
 498     int (*to_insert_fork_catchpoint) (int);
 499     int (*to_remove_fork_catchpoint) (int);
 500     int (*to_insert_vfork_catchpoint) (int);
 501     int (*to_remove_vfork_catchpoint) (int);
 502     int (*to_follow_fork) (struct target_ops *, int);
 503     int (*to_insert_exec_catchpoint) (int);
 504     int (*to_remove_exec_catchpoint) (int);
 505     int (*to_set_syscall_catchpoint) (int, int, int, int, int *);
 506     int (*to_has_exited) (int, int, int *);
 507     void (*to_mourn_inferior) (struct target_ops *);
 508     int (*to_can_run) (void);
 509
 510     /* Documentation of this routine is provided with the corresponding
 511        target_* macro.  */
 512     void (*to_pass_signals) (int, unsigned char *);
 513
 514     /* Documentation of this routine is provided with the
 515        corresponding target_* function.  */
 516     void (*to_program_signals) (int, unsigned char *);
 517
 518     int (*to_thread_alive) (struct target_ops *, ptid_t ptid);
 519     void (*to_find_new_threads) (struct target_ops *);
 520     char *(*to_pid_to_str) (struct target_ops *, ptid_t);
 521     char *(*to_extra_thread_info) (struct thread_info *);
 522     char *(*to_thread_name) (struct thread_info *);
 523     void (*to_stop) (ptid_t);
 524     void (*to_rcmd) (char *command, struct ui_file *output);
 525     char *(*to_pid_to_exec_file) (int pid);
 526     void (*to_log_command) (const char *);
 527     struct target_section_table *(*to_get_section_table) (struct target_ops *);
 528     enum strata to_stratum;
 529     int (*to_has_all_memory) (struct target_ops *);
 530     int (*to_has_memory) (struct target_ops *);
 531     int (*to_has_stack) (struct target_ops *);
 532     int (*to_has_registers) (struct target_ops *);
 533     int (*to_has_execution) (struct target_ops *, ptid_t);
 534     int to_has_thread_control;  /* control thread execution */
 535     int to_attach_no_wait;
 536     /* ASYNC target controls */
 537     int (*to_can_async_p) (void);
 538     int (*to_is_async_p) (void);
 539     void (*to_async) (void (*) (enum inferior_event_type, void *), void *);
 540     int (*to_supports_non_stop) (void);
 541     /* find_memory_regions support method for gcore */
 542     int (*to_find_memory_regions) (find_memory_region_ftype func, void *data);
 543     /* make_corefile_notes support method for gcore */
 544     char * (*to_make_corefile_notes) (bfd *, int *);
 545     /* get_bookmark support method for bookmarks */
 546     gdb_byte * (*to_get_bookmark) (char *, int);
 547     /* goto_bookmark support method for bookmarks */
 548     void (*to_goto_bookmark) (gdb_byte *, int);
 549     /* Return the thread-local address at OFFSET in the
 550        thread-local storage for the thread PTID and the shared library
 551        or executable file given by OBJFILE.  If that block of
 552        thread-local storage hasn't been allocated yet, this function
 553        may return an error.  */
 554     CORE_ADDR (*to_get_thread_local_address) (struct target_ops *ops,
 555                                               ptid_t ptid,
 556                                               CORE_ADDR load_module_addr,
 557                                               CORE_ADDR offset);
 558
 559     /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 560        OBJECT.  The OFFSET, for a seekable object, specifies the
 561        starting point.  The ANNEX can be used to provide additional
 562        data-specific information to the target.
 563
 564        Return the number of bytes actually transfered, zero when no
 565        further transfer is possible, and -1 when the transfer is not
 566        supported.  Return of a positive value smaller than LEN does
 567        not indicate the end of the object, only the end of the
 568        transfer; higher level code should continue transferring if
 569        desired.  This is handled in target.c.
 570
 571        The interface does not support a "retry" mechanism.  Instead it
 572        assumes that at least one byte will be transfered on each
 573        successful call.
 574
 575        NOTE: cagney/2003-10-17: The current interface can lead to
 576        fragmented transfers.  Lower target levels should not implement
 577        hacks, such as enlarging the transfer, in an attempt to
 578        compensate for this.  Instead, the target stack should be
 579        extended so that it implements supply/collect methods and a
 580        look-aside object cache.  With that available, the lowest
 581        target can safely and freely "push" data up the stack.
 582
 583        See target_read and target_write for more information.  One,
 584        and only one, of readbuf or writebuf must be non-NULL.  */
 585
 586     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 587                                 enum target_object object, const char *annex,
 588                                 gdb_byte *readbuf, const gdb_byte *writebuf,
 589                                 ULONGEST offset, LONGEST len);
 590
 591     /* Returns the memory map for the target.  A return value of NULL
 592        means that no memory map is available.  If a memory address
 593        does not fall within any returned regions, it's assumed to be
 594        RAM.  The returned memory regions should not overlap.
 595
 596        The order of regions does not matter; target_memory_map will
 597        sort regions by starting address.  For that reason, this
 598        function should not be called directly except via
 599        target_memory_map.
 600
 601        This method should not cache data; if the memory map could
 602        change unexpectedly, it should be invalidated, and higher
 603        layers will re-fetch it.  */
 604     VEC(mem_region_s) *(*to_memory_map) (struct target_ops *);
 605
 606     /* Erases the region of flash memory starting at ADDRESS, of
 607        length LENGTH.
 608
 609        Precondition: both ADDRESS and ADDRESS+LENGTH should be aligned
 610        on flash block boundaries, as reported by 'to_memory_map'.  */
 611     void (*to_flash_erase) (struct target_ops *,
 612                            ULONGEST address, LONGEST length);
 613
 614     /* Finishes a flash memory write sequence.  After this operation
 615        all flash memory should be available for writing and the result
 616        of reading from areas written by 'to_flash_write' should be
 617        equal to what was written.  */
 618     void (*to_flash_done) (struct target_ops *);
 619
 620     /* Describe the architecture-specific features of this target.
 621        Returns the description found, or NULL if no description
 622        was available.  */
 623     const struct target_desc *(*to_read_description) (struct target_ops *ops);
 624
 625     /* Build the PTID of the thread on which a given task is running,
 626        based on LWP and THREAD.  These values are extracted from the
 627        task Private_Data section of the Ada Task Control Block, and
 628        their interpretation depends on the target.  */
 629     ptid_t (*to_get_ada_task_ptid) (long lwp, long thread);
 630
 631     /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
 632        Return 0 if *READPTR is already at the end of the buffer.
 633        Return -1 if there is insufficient buffer for a whole entry.
 634        Return 1 if an entry was read into *TYPEP and *VALP.  */
 635     int (*to_auxv_parse) (struct target_ops *ops, gdb_byte **readptr,
 636                          gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp);
 637
 638     /* Search SEARCH_SPACE_LEN bytes beginning at START_ADDR for the
 639        sequence of bytes in PATTERN with length PATTERN_LEN.
 640
 641        The result is 1 if found, 0 if not found, and -1 if there was an error
 642        requiring halting of the search (e.g. memory read error).
 643        If the pattern is found the address is recorded in FOUND_ADDRP.  */
 644     int (*to_search_memory) (struct target_ops *ops,
 645                              CORE_ADDR start_addr, ULONGEST search_space_len,
 646                              const gdb_byte *pattern, ULONGEST pattern_len,
 647                              CORE_ADDR *found_addrp);
 648
 649     /* Can target execute in reverse?  */
 650     int (*to_can_execute_reverse) (void);
 651
 652     /* The direction the target is currently executing.  Must be
 653        implemented on targets that support reverse execution and async
 654        mode.  The default simply returns forward execution.  */
 655     enum exec_direction_kind (*to_execution_direction) (void);
 656
 657     /* Does this target support debugging multiple processes
 658        simultaneously?  */
 659     int (*to_supports_multi_process) (void);
 660
 661     /* Does this target support enabling and disabling tracepoints while a trace
 662        experiment is running?  */
 663     int (*to_supports_enable_disable_tracepoint) (void);
 664
 665     /* Does this target support disabling address space randomization?  */
 666     int (*to_supports_disable_randomization) (void);
 667
 668     /* Does this target support the tracenz bytecode for string collection?  */
 669     int (*to_supports_string_tracing) (void);
 670
 671     /* Does this target support evaluation of breakpoint conditions on its
 672        end?  */
 673     int (*to_supports_evaluation_of_breakpoint_conditions) (void);
 674
 675     /* Determine current architecture of thread PTID.
 676
 677        The target is supposed to determine the architecture of the code where
 678        the target is currently stopped at (on Cell, if a target is in spu_run,
 679        to_thread_architecture would return SPU, otherwise PPC32 or PPC64).
 680        This is architecture used to perform decr_pc_after_break adjustment,
 681        and also determines the frame architecture of the innermost frame.
 682        ptrace operations need to operate according to target_gdbarch.
 683
 684        The default implementation always returns target_gdbarch.  */
 685     struct gdbarch *(*to_thread_architecture) (struct target_ops *, ptid_t);
 686
 687     /* Determine current address space of thread PTID.
 688
 689        The default implementation always returns the inferior's
 690        address space.  */
 691     struct address_space *(*to_thread_address_space) (struct target_ops *,
 692                                                       ptid_t);
 693
 694     /* Target file operations.  */
 695
 696     /* Open FILENAME on the target, using FLAGS and MODE.  Return a
 697        target file descriptor, or -1 if an error occurs (and set
 698        *TARGET_ERRNO).  */
 699     int (*to_fileio_open) (const char *filename, int flags, int mode,
 700                            int *target_errno);
 701
 702     /* Write up to LEN bytes from WRITE_BUF to FD on the target.
 703        Return the number of bytes written, or -1 if an error occurs
 704        (and set *TARGET_ERRNO).  */
 705     int (*to_fileio_pwrite) (int fd, const gdb_byte *write_buf, int len,
 706                              ULONGEST offset, int *target_errno);
 707
 708     /* Read up to LEN bytes FD on the target into READ_BUF.
 709        Return the number of bytes read, or -1 if an error occurs
 710        (and set *TARGET_ERRNO).  */
 711     int (*to_fileio_pread) (int fd, gdb_byte *read_buf, int len,
 712                             ULONGEST offset, int *target_errno);
 713
 714     /* Close FD on the target.  Return 0, or -1 if an error occurs
 715        (and set *TARGET_ERRNO).  */
 716     int (*to_fileio_close) (int fd, int *target_errno);
 717
 718     /* Unlink FILENAME on the target.  Return 0, or -1 if an error
 719        occurs (and set *TARGET_ERRNO).  */
 720     int (*to_fileio_unlink) (const char *filename, int *target_errno);
 721
 722     /* Read value of symbolic link FILENAME on the target.  Return a
 723        null-terminated string allocated via xmalloc, or NULL if an error
 724        occurs (and set *TARGET_ERRNO).  */
 725     char *(*to_fileio_readlink) (const char *filename, int *target_errno);
 726
 727
 728     /* Implement the "info proc" command.  */
 729     void (*to_info_proc) (struct target_ops *, char *, enum info_proc_what);
 730
 731     /* Tracepoint-related operations.  */
 732
 733     /* Prepare the target for a tracing run.  */
 734     void (*to_trace_init) (void);
 735
 736     /* Send full details of a tracepoint location to the target.  */
 737     void (*to_download_tracepoint) (struct bp_location *location);
 738
 739     /* Is the target able to download tracepoint locations in current
 740        state?  */
 741     int (*to_can_download_tracepoint) (void);
 742
 743     /* Send full details of a trace state variable to the target.  */
 744     void (*to_download_trace_state_variable) (struct trace_state_variable *tsv);
 745
 746     /* Enable a tracepoint on the target.  */
 747     void (*to_enable_tracepoint) (struct bp_location *location);
 748
 749     /* Disable a tracepoint on the target.  */
 750     void (*to_disable_tracepoint) (struct bp_location *location);
 751
 752     /* Inform the target info of memory regions that are readonly
 753        (such as text sections), and so it should return data from
 754        those rather than look in the trace buffer.  */
 755     void (*to_trace_set_readonly_regions) (void);
 756
 757     /* Start a trace run.  */
 758     void (*to_trace_start) (void);
 759
 760     /* Get the current status of a tracing run.  */
 761     int (*to_get_trace_status) (struct trace_status *ts);
 762
 763     void (*to_get_tracepoint_status) (struct breakpoint *tp,
 764                                       struct uploaded_tp *utp);
 765
 766     /* Stop a trace run.  */
 767     void (*to_trace_stop) (void);
 768
 769    /* Ask the target to find a trace frame of the given type TYPE,
 770       using NUM, ADDR1, and ADDR2 as search parameters.  Returns the
 771       number of the trace frame, and also the tracepoint number at
 772       TPP.  If no trace frame matches, return -1.  May throw if the
 773       operation fails.  */
 774     int (*to_trace_find) (enum trace_find_type type, int num,
 775                           ULONGEST addr1, ULONGEST addr2, int *tpp);
 776
 777     /* Get the value of the trace state variable number TSV, returning
 778        1 if the value is known and writing the value itself into the
 779        location pointed to by VAL, else returning 0.  */
 780     int (*to_get_trace_state_variable_value) (int tsv, LONGEST *val);
 781
 782     int (*to_save_trace_data) (const char *filename);
 783
 784     int (*to_upload_tracepoints) (struct uploaded_tp **utpp);
 785
 786     int (*to_upload_trace_state_variables) (struct uploaded_tsv **utsvp);
 787
 788     LONGEST (*to_get_raw_trace_data) (gdb_byte *buf,
 789                                       ULONGEST offset, LONGEST len);
 790
 791     /* Get the minimum length of instruction on which a fast tracepoint
 792        may be set on the target.  If this operation is unsupported,
 793        return -1.  If for some reason the minimum length cannot be
 794        determined, return 0.  */
 795     int (*to_get_min_fast_tracepoint_insn_len) (void);
 796
 797     /* Set the target's tracing behavior in response to unexpected
 798        disconnection - set VAL to 1 to keep tracing, 0 to stop.  */
 799     void (*to_set_disconnected_tracing) (int val);
 800     void (*to_set_circular_trace_buffer) (int val);
 801
 802     /* Add/change textual notes about the trace run, returning 1 if
 803        successful, 0 otherwise.  */
 804     int (*to_set_trace_notes) (char *user, char *notes, char* stopnotes);
 805
 806     /* Return the processor core that thread PTID was last seen on.
 807        This information is updated only when:
 808        - update_thread_list is called
 809        - thread stops
 810        If the core cannot be determined -- either for the specified
 811        thread, or right now, or in this debug session, or for this
 812        target -- return -1.  */
 813     int (*to_core_of_thread) (struct target_ops *, ptid_t ptid);
 814
 815     /* Verify that the memory in the [MEMADDR, MEMADDR+SIZE) range
 816        matches the contents of [DATA,DATA+SIZE).  Returns 1 if there's
 817        a match, 0 if there's a mismatch, and -1 if an error is
 818        encountered while reading memory.  */
 819     int (*to_verify_memory) (struct target_ops *, const gdb_byte *data,
 820                              CORE_ADDR memaddr, ULONGEST size);
 821
 822     /* Return the address of the start of the Thread Information Block
 823        a Windows OS specific feature.  */
 824     int (*to_get_tib_address) (ptid_t ptid, CORE_ADDR *addr);
 825
 826     /* Send the new settings of write permission variables.  */
 827     void (*to_set_permissions) (void);
 828
 829     /* Look for a static tracepoint marker at ADDR, and fill in MARKER
 830        with its details.  Return 1 on success, 0 on failure.  */
 831     int (*to_static_tracepoint_marker_at) (CORE_ADDR,
 832                                            struct static_tracepoint_marker *marker);
 833
 834     /* Return a vector of all tracepoints markers string id ID, or all
 835        markers if ID is NULL.  */
 836     VEC(static_tracepoint_marker_p) *(*to_static_tracepoint_markers_by_strid)
 837       (const char *id);
 838
 839     /* Return a traceframe info object describing the current
 840        traceframe's contents.  This method should not cache data;
 841        higher layers take care of caching, invalidating, and
 842        re-fetching when necessary.  */
 843     struct traceframe_info *(*to_traceframe_info) (void);
 844
 845     /* Ask the target to use or not to use agent according to USE.  Return 1
 846        successful, 0 otherwise.  */
 847     int (*to_use_agent) (int use);
 848
 849     /* Is the target able to use agent in current state?  */
 850     int (*to_can_use_agent) (void);
 851
 852     int to_magic;
 853     /* Need sub-structure for target machine related rather than comm related?
 854      */
 855   };
 856
 857 /* Magic number for checking ops size.  If a struct doesn't end with this
 858    number, somebody changed the declaration but didn't change all the
 859    places that initialize one.  */
 860
 861 #define OPS_MAGIC       3840
 862
 863 /* The ops structure for our "current" target process.  This should
 864    never be NULL.  If there is no target, it points to the dummy_target.  */
 865
 866 extern struct target_ops current_target;
 867
 868 /* Define easy words for doing these operations on our current target.  */
 869
 870 #define target_shortname        (current_target.to_shortname)
 871 #define target_longname         (current_target.to_longname)
 872
 873 /* Does whatever cleanup is required for a target that we are no
 874    longer going to be calling.  QUITTING indicates that GDB is exiting
 875    and should not get hung on an error (otherwise it is important to
 876    perform clean termination, even if it takes a while).  This routine
 877    is automatically always called after popping the target off the
 878    target stack - the target's own methods are no longer available
 879    through the target vector.  Closing file descriptors and freeing all
 880    memory allocated memory are typical things it should do.  */
 881
 882 void target_close (struct target_ops *targ, int quitting);
 883
 884 /* Attaches to a process on the target side.  Arguments are as passed
 885    to the `attach' command by the user.  This routine can be called
 886    when the target is not on the target-stack, if the target_can_run
 887    routine returns 1; in that case, it must push itself onto the stack.
 888    Upon exit, the target should be ready for normal operations, and
 889    should be ready to deliver the status of the process immediately
 890    (without waiting) to an upcoming target_wait call.  */
 891
 892 void target_attach (char *, int);
 893
 894 /* Some targets don't generate traps when attaching to the inferior,
 895    or their target_attach implementation takes care of the waiting.
 896    These targets must set to_attach_no_wait.  */
 897
 898 #define target_attach_no_wait \
 899      (current_target.to_attach_no_wait)
 900
 901 /* The target_attach operation places a process under debugger control,
 902    and stops the process.
 903
 904    This operation provides a target-specific hook that allows the
 905    necessary bookkeeping to be performed after an attach completes.  */
 906 #define target_post_attach(pid) \
 907      (*current_target.to_post_attach) (pid)
 908
 909 /* Takes a program previously attached to and detaches it.
 910    The program may resume execution (some targets do, some don't) and will
 911    no longer stop on signals, etc.  We better not have left any breakpoints
 912    in the program or it'll die when it hits one.  ARGS is arguments
 913    typed by the user (e.g. a signal to send the process).  FROM_TTY
 914    says whether to be verbose or not.  */
 915
 916 extern void target_detach (char *, int);
 917
 918 /* Disconnect from the current target without resuming it (leaving it
 919    waiting for a debugger).  */
 920
 921 extern void target_disconnect (char *, int);
 922
 923 /* Resume execution of the target process PTID.  STEP says whether to
 924    single-step or to run free; SIGGNAL is the signal to be given to
 925    the target, or GDB_SIGNAL_0 for no signal.  The caller may not
 926    pass GDB_SIGNAL_DEFAULT.  */
 927
 928 extern void target_resume (ptid_t ptid, int step, enum gdb_signal signal);
 929
 930 /* Wait for process pid to do something.  PTID = -1 to wait for any
 931    pid to do something.  Return pid of child, or -1 in case of error;
 932    store status through argument pointer STATUS.  Note that it is
 933    _NOT_ OK to throw_exception() out of target_wait() without popping
 934    the debugging target from the stack; GDB isn't prepared to get back
 935    to the prompt with a debugging target but without the frame cache,
 936    stop_pc, etc., set up.  OPTIONS is a bitwise OR of TARGET_W*
 937    options.  */
 938
 939 extern ptid_t target_wait (ptid_t ptid, struct target_waitstatus *status,
 940                            int options);
 941
 942 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 943
 944 extern void target_fetch_registers (struct regcache *regcache, int regno);
 945
 946 /* Store at least register REGNO, or all regs if REGNO == -1.
 947    It can store as many registers as it wants to, so target_prepare_to_store
 948    must have been previously called.  Calls error() if there are problems.  */
 949
 950 extern void target_store_registers (struct regcache *regcache, int regs);
 951
 952 /* Get ready to modify the registers array.  On machines which store
 953    individual registers, this doesn't need to do anything.  On machines
 954    which store all the registers in one fell swoop, this makes sure
 955    that REGISTERS contains all the registers from the program being
 956    debugged.  */
 957
 958 #define target_prepare_to_store(regcache)       \
 959      (*current_target.to_prepare_to_store) (regcache)
 960
 961 /* Determine current address space of thread PTID.  */
 962
 963 struct address_space *target_thread_address_space (ptid_t);
 964
 965 /* Implement the "info proc" command.  */
 966
 967 void target_info_proc (char *, enum info_proc_what);
 968
 969 /* Returns true if this target can debug multiple processes
 970    simultaneously.  */
 971
 972 #define target_supports_multi_process() \
 973      (*current_target.to_supports_multi_process) ()
 974
 975 /* Returns true if this target can disable address space randomization.  */
 976
 977 int target_supports_disable_randomization (void);
 978
 979 /* Returns true if this target can enable and disable tracepoints
 980    while a trace experiment is running.  */
 981
 982 #define target_supports_enable_disable_tracepoint() \
 983   (*current_target.to_supports_enable_disable_tracepoint) ()
 984
 985 #define target_supports_string_tracing() \
 986   (*current_target.to_supports_string_tracing) ()
 987
 988 /* Returns true if this target can handle breakpoint conditions
 989    on its end.  */
 990
 991 #define target_supports_evaluation_of_breakpoint_conditions() \
 992   (*current_target.to_supports_evaluation_of_breakpoint_conditions) ()
 993
 994 /* Invalidate all target dcaches.  */
 995 extern void target_dcache_invalidate (void);
 996
 997 extern int target_read_string (CORE_ADDR, char **, int, int *);
 998
 999 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
1000
1001 extern int target_read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
1002
1003 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
1004                                 int len);
1005
1006 extern int target_write_raw_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
1007                                     int len);
1008
1009 /* Fetches the target's memory map.  If one is found it is sorted
1010    and returned, after some consistency checking.  Otherwise, NULL
1011    is returned.  */
1012 VEC(mem_region_s) *target_memory_map (void);
1013
1014 /* Erase the specified flash region.  */
1015 void target_flash_erase (ULONGEST address, LONGEST length);
1016
1017 /* Finish a sequence of flash operations.  */
1018 void target_flash_done (void);
1019
1020 /* Describes a request for a memory write operation.  */
1021 struct memory_write_request
1022   {
1023     /* Begining address that must be written.  */
1024     ULONGEST begin;
1025     /* Past-the-end address.  */
1026     ULONGEST end;
1027     /* The data to write.  */
1028     gdb_byte *data;
1029     /* A callback baton for progress reporting for this request.  */
1030     void *baton;
1031   };
1032 typedef struct memory_write_request memory_write_request_s;
1033 DEF_VEC_O(memory_write_request_s);
1034
1035 /* Enumeration specifying different flash preservation behaviour.  */
1036 enum flash_preserve_mode
1037   {
1038     flash_preserve,
1039     flash_discard
1040   };
1041
1042 /* Write several memory blocks at once.  This version can be more
1043    efficient than making several calls to target_write_memory, in
1044    particular because it can optimize accesses to flash memory.
1045
1046    Moreover, this is currently the only memory access function in gdb
1047    that supports writing to flash memory, and it should be used for
1048    all cases where access to flash memory is desirable.
1049
1050    REQUESTS is the vector (see vec.h) of memory_write_request.
1051    PRESERVE_FLASH_P indicates what to do with blocks which must be
1052      erased, but not completely rewritten.
1053    PROGRESS_CB is a function that will be periodically called to provide
1054      feedback to user.  It will be called with the baton corresponding
1055      to the request currently being written.  It may also be called
1056      with a NULL baton, when preserved flash sectors are being rewritten.
1057
1058    The function returns 0 on success, and error otherwise.  */
1059 int target_write_memory_blocks (VEC(memory_write_request_s) *requests,
1060                                 enum flash_preserve_mode preserve_flash_p,
1061                                 void (*progress_cb) (ULONGEST, void *));
1062
1063 /* From infrun.c.  */
1064
1065 extern int inferior_has_forked (ptid_t pid, ptid_t *child_pid);
1066
1067 extern int inferior_has_vforked (ptid_t pid, ptid_t *child_pid);
1068
1069 extern int inferior_has_execd (ptid_t pid, char **execd_pathname);
1070
1071 extern int inferior_has_called_syscall (ptid_t pid, int *syscall_number);
1072
1073 /* Print a line about the current target.  */
1074
1075 #define target_files_info()     \
1076      (*current_target.to_files_info) (&current_target)
1077
1078 /* Insert a breakpoint at address BP_TGT->placed_address in the target
1079    machine.  Result is 0 for success, or an errno value.  */
1080
1081 extern int target_insert_breakpoint (struct gdbarch *gdbarch,
1082                                      struct bp_target_info *bp_tgt);
1083
1084 /* Remove a breakpoint at address BP_TGT->placed_address in the target
1085    machine.  Result is 0 for success, or an errno value.  */
1086
1087 extern int target_remove_breakpoint (struct gdbarch *gdbarch,
1088                                      struct bp_target_info *bp_tgt);
1089
1090 /* Initialize the terminal settings we record for the inferior,
1091    before we actually run the inferior.  */
1092
1093 #define target_terminal_init() \
1094      (*current_target.to_terminal_init) ()
1095
1096 /* Put the inferior's terminal settings into effect.
1097    This is preparation for starting or resuming the inferior.  */
1098
1099 extern void target_terminal_inferior (void);
1100
1101 /* Put some of our terminal settings into effect,
1102    enough to get proper results from our output,
1103    but do not change into or out of RAW mode
1104    so that no input is discarded.
1105
1106    After doing this, either terminal_ours or terminal_inferior
1107    should be called to get back to a normal state of affairs.  */
1108
1109 #define target_terminal_ours_for_output() \
1110      (*current_target.to_terminal_ours_for_output) ()
1111
1112 /* Put our terminal settings into effect.
1113    First record the inferior's terminal settings
1114    so they can be restored properly later.  */
1115
1116 #define target_terminal_ours() \
1117      (*current_target.to_terminal_ours) ()
1118
1119 /* Save our terminal settings.
1120    This is called from TUI after entering or leaving the curses
1121    mode.  Since curses modifies our terminal this call is here
1122    to take this change into account.  */
1123
1124 #define target_terminal_save_ours() \
1125      (*current_target.to_terminal_save_ours) ()
1126
1127 /* Print useful information about our terminal status, if such a thing
1128    exists.  */
1129
1130 #define target_terminal_info(arg, from_tty) \
1131      (*current_target.to_terminal_info) (arg, from_tty)
1132
1133 /* Kill the inferior process.   Make it go away.  */
1134
1135 extern void target_kill (void);
1136
1137 /* Load an executable file into the target process.  This is expected
1138    to not only bring new code into the target process, but also to
1139    update GDB's symbol tables to match.
1140
1141    ARG contains command-line arguments, to be broken down with
1142    buildargv ().  The first non-switch argument is the filename to
1143    load, FILE; the second is a number (as parsed by strtoul (..., ...,
1144    0)), which is an offset to apply to the load addresses of FILE's
1145    sections.  The target may define switches, or other non-switch
1146    arguments, as it pleases.  */
1147
1148 extern void target_load (char *arg, int from_tty);
1149
1150 /* Start an inferior process and set inferior_ptid to its pid.
1151    EXEC_FILE is the file to run.
1152    ALLARGS is a string containing the arguments to the program.
1153    ENV is the environment vector to pass.  Errors reported with error().
1154    On VxWorks and various standalone systems, we ignore exec_file.  */
1155
1156 void target_create_inferior (char *exec_file, char *args,
1157                              char **env, int from_tty);
1158
1159 /* Some targets (such as ttrace-based HPUX) don't allow us to request
1160    notification of inferior events such as fork and vork immediately
1161    after the inferior is created.  (This because of how gdb gets an
1162    inferior created via invoking a shell to do it.  In such a scenario,
1163    if the shell init file has commands in it, the shell will fork and
1164    exec for each of those commands, and we will see each such fork
1165    event.  Very bad.)
1166
1167    Such targets will supply an appropriate definition for this function.  */
1168
1169 #define target_post_startup_inferior(ptid) \
1170      (*current_target.to_post_startup_inferior) (ptid)
1171
1172 /* On some targets, we can catch an inferior fork or vfork event when
1173    it occurs.  These functions insert/remove an already-created
1174    catchpoint for such events.  They return  0 for success, 1 if the
1175    catchpoint type is not supported and -1 for failure.  */
1176
1177 #define target_insert_fork_catchpoint(pid) \
1178      (*current_target.to_insert_fork_catchpoint) (pid)
1179
1180 #define target_remove_fork_catchpoint(pid) \
1181      (*current_target.to_remove_fork_catchpoint) (pid)
1182
1183 #define target_insert_vfork_catchpoint(pid) \
1184      (*current_target.to_insert_vfork_catchpoint) (pid)
1185
1186 #define target_remove_vfork_catchpoint(pid) \
1187      (*current_target.to_remove_vfork_catchpoint) (pid)
1188
1189 /* If the inferior forks or vforks, this function will be called at
1190    the next resume in order to perform any bookkeeping and fiddling
1191    necessary to continue debugging either the parent or child, as
1192    requested, and releasing the other.  Information about the fork
1193    or vfork event is available via get_last_target_status ().
1194    This function returns 1 if the inferior should not be resumed
1195    (i.e. there is another event pending).  */
1196
1197 int target_follow_fork (int follow_child);
1198
1199 /* On some targets, we can catch an inferior exec event when it
1200    occurs.  These functions insert/remove an already-created
1201    catchpoint for such events.  They return  0 for success, 1 if the
1202    catchpoint type is not supported and -1 for failure.  */
1203
1204 #define target_insert_exec_catchpoint(pid) \
1205      (*current_target.to_insert_exec_catchpoint) (pid)
1206
1207 #define target_remove_exec_catchpoint(pid) \
1208      (*current_target.to_remove_exec_catchpoint) (pid)
1209
1210 /* Syscall catch.
1211
1212    NEEDED is nonzero if any syscall catch (of any kind) is requested.
1213    If NEEDED is zero, it means the target can disable the mechanism to
1214    catch system calls because there are no more catchpoints of this type.
1215
1216    ANY_COUNT is nonzero if a generic (filter-less) syscall catch is
1217    being requested.  In this case, both TABLE_SIZE and TABLE should
1218    be ignored.
1219
1220    TABLE_SIZE is the number of elements in TABLE.  It only matters if
1221    ANY_COUNT is zero.
1222
1223    TABLE is an array of ints, indexed by syscall number.  An element in
1224    this array is nonzero if that syscall should be caught.  This argument
1225    only matters if ANY_COUNT is zero.
1226
1227    Return 0 for success, 1 if syscall catchpoints are not supported or -1
1228    for failure.  */
1229
1230 #define target_set_syscall_catchpoint(pid, needed, any_count, table_size, table) \
1231      (*current_target.to_set_syscall_catchpoint) (pid, needed, any_count, \
1232                                                   table_size, table)
1233
1234 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
1235    exit code of PID, if any.  */
1236
1237 #define target_has_exited(pid,wait_status,exit_status) \
1238      (*current_target.to_has_exited) (pid,wait_status,exit_status)
1239
1240 /* The debugger has completed a blocking wait() call.  There is now
1241    some process event that must be processed.  This function should
1242    be defined by those targets that require the debugger to perform
1243    cleanup or internal state changes in response to the process event.  */
1244
1245 /* The inferior process has died.  Do what is right.  */
1246
1247 void target_mourn_inferior (void);
1248
1249 /* Does target have enough data to do a run or attach command? */
1250
1251 #define target_can_run(t) \
1252      ((t)->to_can_run) ()
1253
1254 /* Set list of signals to be handled in the target.
1255
1256    PASS_SIGNALS is an array of size NSIG, indexed by target signal number
1257    (enum gdb_signal).  For every signal whose entry in this array is
1258    non-zero, the target is allowed -but not required- to skip reporting
1259    arrival of the signal to the GDB core by returning from target_wait,
1260    and to pass the signal directly to the inferior instead.
1261
1262    However, if the target is hardware single-stepping a thread that is
1263    about to receive a signal, it needs to be reported in any case, even
1264    if mentioned in a previous target_pass_signals call.   */
1265
1266 extern void target_pass_signals (int nsig, unsigned char *pass_signals);
1267
1268 /* Set list of signals the target may pass to the inferior.  This
1269    directly maps to the "handle SIGNAL pass/nopass" setting.
1270
1271    PROGRAM_SIGNALS is an array of size NSIG, indexed by target signal
1272    number (enum gdb_signal).  For every signal whose entry in this
1273    array is non-zero, the target is allowed to pass the signal to the
1274    inferior.  Signals not present in the array shall be silently
1275    discarded.  This does not influence whether to pass signals to the
1276    inferior as a result of a target_resume call.  This is useful in
1277    scenarios where the target needs to decide whether to pass or not a
1278    signal to the inferior without GDB core involvement, such as for
1279    example, when detaching (as threads may have been suspended with
1280    pending signals not reported to GDB).  */
1281
1282 extern void target_program_signals (int nsig, unsigned char *program_signals);
1283
1284 /* Check to see if a thread is still alive.  */
1285
1286 extern int target_thread_alive (ptid_t ptid);
1287
1288 /* Query for new threads and add them to the thread list.  */
1289
1290 extern void target_find_new_threads (void);
1291
1292 /* Make target stop in a continuable fashion.  (For instance, under
1293    Unix, this should act like SIGSTOP).  This function is normally
1294    used by GUIs to implement a stop button.  */
1295
1296 extern void target_stop (ptid_t ptid);
1297
1298 /* Send the specified COMMAND to the target's monitor
1299    (shell,interpreter) for execution.  The result of the query is
1300    placed in OUTBUF.  */
1301
1302 #define target_rcmd(command, outbuf) \
1303      (*current_target.to_rcmd) (command, outbuf)
1304
1305
1306 /* Does the target include all of memory, or only part of it?  This
1307    determines whether we look up the target chain for other parts of
1308    memory if this target can't satisfy a request.  */
1309
1310 extern int target_has_all_memory_1 (void);
1311 #define target_has_all_memory target_has_all_memory_1 ()
1312
1313 /* Does the target include memory?  (Dummy targets don't.)  */
1314
1315 extern int target_has_memory_1 (void);
1316 #define target_has_memory target_has_memory_1 ()
1317
1318 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
1319    we start a process.)  */
1320
1321 extern int target_has_stack_1 (void);
1322 #define target_has_stack target_has_stack_1 ()
1323
1324 /* Does the target have registers?  (Exec files don't.)  */
1325
1326 extern int target_has_registers_1 (void);
1327 #define target_has_registers target_has_registers_1 ()
1328
1329 /* Does the target have execution?  Can we make it jump (through
1330    hoops), or pop its stack a few times?  This means that the current
1331    target is currently executing; for some targets, that's the same as
1332    whether or not the target is capable of execution, but there are
1333    also targets which can be current while not executing.  In that
1334    case this will become true after target_create_inferior or
1335    target_attach.  */
1336
1337 extern int target_has_execution_1 (ptid_t);
1338
1339 /* Like target_has_execution_1, but always passes inferior_ptid.  */
1340
1341 extern int target_has_execution_current (void);
1342
1343 #define target_has_execution target_has_execution_current ()
1344
1345 /* Default implementations for process_stratum targets.  Return true
1346    if there's a selected inferior, false otherwise.  */
1347
1348 extern int default_child_has_all_memory (struct target_ops *ops);
1349 extern int default_child_has_memory (struct target_ops *ops);
1350 extern int default_child_has_stack (struct target_ops *ops);
1351 extern int default_child_has_registers (struct target_ops *ops);
1352 extern int default_child_has_execution (struct target_ops *ops,
1353                                         ptid_t the_ptid);
1354
1355 /* Can the target support the debugger control of thread execution?
1356    Can it lock the thread scheduler?  */
1357
1358 #define target_can_lock_scheduler \
1359      (current_target.to_has_thread_control & tc_schedlock)
1360
1361 /* Should the target enable async mode if it is supported?  Temporary
1362    cludge until async mode is a strict superset of sync mode.  */
1363 extern int target_async_permitted;
1364
1365 /* Can the target support asynchronous execution?  */
1366 #define target_can_async_p() (current_target.to_can_async_p ())
1367
1368 /* Is the target in asynchronous execution mode?  */
1369 #define target_is_async_p() (current_target.to_is_async_p ())
1370
1371 int target_supports_non_stop (void);
1372
1373 /* Put the target in async mode with the specified callback function.  */
1374 #define target_async(CALLBACK,CONTEXT) \
1375      (current_target.to_async ((CALLBACK), (CONTEXT)))
1376
1377 #define target_execution_direction() \
1378   (current_target.to_execution_direction ())
1379
1380 /* Converts a process id to a string.  Usually, the string just contains
1381    `process xyz', but on some systems it may contain
1382    `process xyz thread abc'.  */
1383
1384 extern char *target_pid_to_str (ptid_t ptid);
1385
1386 extern char *normal_pid_to_str (ptid_t ptid);
1387
1388 /* Return a short string describing extra information about PID,
1389    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
1390    is okay.  */
1391
1392 #define target_extra_thread_info(TP) \
1393      (current_target.to_extra_thread_info (TP))
1394
1395 /* Return the thread's name.  A NULL result means that the target
1396    could not determine this thread's name.  */
1397
1398 extern char *target_thread_name (struct thread_info *);
1399
1400 /* Attempts to find the pathname of the executable file
1401    that was run to create a specified process.
1402
1403    The process PID must be stopped when this operation is used.
1404
1405    If the executable file cannot be determined, NULL is returned.
1406
1407    Else, a pointer to a character string containing the pathname
1408    is returned.  This string should be copied into a buffer by
1409    the client if the string will not be immediately used, or if
1410    it must persist.  */
1411
1412 #define target_pid_to_exec_file(pid) \
1413      (current_target.to_pid_to_exec_file) (pid)
1414
1415 /* See the to_thread_architecture description in struct target_ops.  */
1416
1417 #define target_thread_architecture(ptid) \
1418      (current_target.to_thread_architecture (&current_target, ptid))
1419
1420 /*
1421  * Iterator function for target memory regions.
1422  * Calls a callback function once for each memory region 'mapped'
1423  * in the child process.  Defined as a simple macro rather than
1424  * as a function macro so that it can be tested for nullity.
1425  */
1426
1427 #define target_find_memory_regions(FUNC, DATA) \
1428      (current_target.to_find_memory_regions) (FUNC, DATA)
1429
1430 /*
1431  * Compose corefile .note section.
1432  */
1433
1434 #define target_make_corefile_notes(BFD, SIZE_P) \
1435      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1436
1437 /* Bookmark interfaces.  */
1438 #define target_get_bookmark(ARGS, FROM_TTY) \
1439      (current_target.to_get_bookmark) (ARGS, FROM_TTY)
1440
1441 #define target_goto_bookmark(ARG, FROM_TTY) \
1442      (current_target.to_goto_bookmark) (ARG, FROM_TTY)
1443
1444 /* Hardware watchpoint interfaces.  */
1445
1446 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1447    write).  Only the INFERIOR_PTID task is being queried.  */
1448
1449 #define target_stopped_by_watchpoint \
1450    (*current_target.to_stopped_by_watchpoint)
1451
1452 /* Non-zero if we have steppable watchpoints  */
1453
1454 #define target_have_steppable_watchpoint \
1455    (current_target.to_have_steppable_watchpoint)
1456
1457 /* Non-zero if we have continuable watchpoints  */
1458
1459 #define target_have_continuable_watchpoint \
1460    (current_target.to_have_continuable_watchpoint)
1461
1462 /* Provide defaults for hardware watchpoint functions.  */
1463
1464 /* If the *_hw_beakpoint functions have not been defined
1465    elsewhere use the definitions in the target vector.  */
1466
1467 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1468    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1469    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1470    (including this one?).  OTHERTYPE is who knows what...  */
1471
1472 #define target_can_use_hardware_watchpoint(TYPE,CNT,OTHERTYPE) \
1473  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1474
1475 /* Returns the number of debug registers needed to watch the given
1476    memory region, or zero if not supported.  */
1477
1478 #define target_region_ok_for_hw_watchpoint(addr, len) \
1479     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1480
1481
1482 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.
1483    TYPE is 0 for write, 1 for read, and 2 for read/write accesses.
1484    COND is the expression for its condition, or NULL if there's none.
1485    Returns 0 for success, 1 if the watchpoint type is not supported,
1486    -1 for failure.  */
1487
1488 #define target_insert_watchpoint(addr, len, type, cond) \
1489      (*current_target.to_insert_watchpoint) (addr, len, type, cond)
1490
1491 #define target_remove_watchpoint(addr, len, type, cond) \
1492      (*current_target.to_remove_watchpoint) (addr, len, type, cond)
1493
1494 /* Insert a new masked watchpoint at ADDR using the mask MASK.
1495    RW may be hw_read for a read watchpoint, hw_write for a write watchpoint
1496    or hw_access for an access watchpoint.  Returns 0 for success, 1 if
1497    masked watchpoints are not supported, -1 for failure.  */
1498
1499 extern int target_insert_mask_watchpoint (CORE_ADDR, CORE_ADDR, int);
1500
1501 /* Remove a masked watchpoint at ADDR with the mask MASK.
1502    RW may be hw_read for a read watchpoint, hw_write for a write watchpoint
1503    or hw_access for an access watchpoint.  Returns 0 for success, non-zero
1504    for failure.  */
1505
1506 extern int target_remove_mask_watchpoint (CORE_ADDR, CORE_ADDR, int);
1507
1508 #define target_insert_hw_breakpoint(gdbarch, bp_tgt) \
1509      (*current_target.to_insert_hw_breakpoint) (gdbarch, bp_tgt)
1510
1511 #define target_remove_hw_breakpoint(gdbarch, bp_tgt) \
1512      (*current_target.to_remove_hw_breakpoint) (gdbarch, bp_tgt)
1513
1514 /* Return number of debug registers needed for a ranged breakpoint,
1515    or -1 if ranged breakpoints are not supported.  */
1516
1517 extern int target_ranged_break_num_registers (void);
1518
1519 /* Return non-zero if target knows the data address which triggered this
1520    target_stopped_by_watchpoint, in such case place it to *ADDR_P.  Only the
1521    INFERIOR_PTID task is being queried.  */
1522 #define target_stopped_data_address(target, addr_p) \
1523     (*target.to_stopped_data_address) (target, addr_p)
1524
1525 /* Return non-zero if ADDR is within the range of a watchpoint spanning
1526    LENGTH bytes beginning at START.  */
1527 #define target_watchpoint_addr_within_range(target, addr, start, length) \
1528   (*target.to_watchpoint_addr_within_range) (target, addr, start, length)
1529
1530 /* Return non-zero if the target is capable of using hardware to evaluate
1531    the condition expression.  In this case, if the condition is false when
1532    the watched memory location changes, execution may continue without the
1533    debugger being notified.
1534
1535    Due to limitations in the hardware implementation, it may be capable of
1536    avoiding triggering the watchpoint in some cases where the condition
1537    expression is false, but may report some false positives as well.
1538    For this reason, GDB will still evaluate the condition expression when
1539    the watchpoint triggers.  */
1540 #define target_can_accel_watchpoint_condition(addr, len, type, cond) \
1541   (*current_target.to_can_accel_watchpoint_condition) (addr, len, type, cond)
1542
1543 /* Return number of debug registers needed for a masked watchpoint,
1544    -1 if masked watchpoints are not supported or -2 if the given address
1545    and mask combination cannot be used.  */
1546
1547 extern int target_masked_watch_num_registers (CORE_ADDR addr, CORE_ADDR mask);
1548
1549 /* Target can execute in reverse?  */
1550 #define target_can_execute_reverse \
1551      (current_target.to_can_execute_reverse ? \
1552       current_target.to_can_execute_reverse () : 0)
1553
1554 extern const struct target_desc *target_read_description (struct target_ops *);
1555
1556 #define target_get_ada_task_ptid(lwp, tid) \
1557      (*current_target.to_get_ada_task_ptid) (lwp,tid)
1558
1559 /* Utility implementation of searching memory.  */
1560 extern int simple_search_memory (struct target_ops* ops,
1561                                  CORE_ADDR start_addr,
1562                                  ULONGEST search_space_len,
1563                                  const gdb_byte *pattern,
1564                                  ULONGEST pattern_len,
1565                                  CORE_ADDR *found_addrp);
1566
1567 /* Main entry point for searching memory.  */
1568 extern int target_search_memory (CORE_ADDR start_addr,
1569                                  ULONGEST search_space_len,
1570                                  const gdb_byte *pattern,
1571                                  ULONGEST pattern_len,
1572                                  CORE_ADDR *found_addrp);
1573
1574 /* Target file operations.  */
1575
1576 /* Open FILENAME on the target, using FLAGS and MODE.  Return a
1577    target file descriptor, or -1 if an error occurs (and set
1578    *TARGET_ERRNO).  */
1579 extern int target_fileio_open (const char *filename, int flags, int mode,
1580                                int *target_errno);
1581
1582 /* Write up to LEN bytes from WRITE_BUF to FD on the target.
1583    Return the number of bytes written, or -1 if an error occurs
1584    (and set *TARGET_ERRNO).  */
1585 extern int target_fileio_pwrite (int fd, const gdb_byte *write_buf, int len,
1586                                  ULONGEST offset, int *target_errno);
1587
1588 /* Read up to LEN bytes FD on the target into READ_BUF.
1589    Return the number of bytes read, or -1 if an error occurs
1590    (and set *TARGET_ERRNO).  */
1591 extern int target_fileio_pread (int fd, gdb_byte *read_buf, int len,
1592                                 ULONGEST offset, int *target_errno);
1593
1594 /* Close FD on the target.  Return 0, or -1 if an error occurs
1595    (and set *TARGET_ERRNO).  */
1596 extern int target_fileio_close (int fd, int *target_errno);
1597
1598 /* Unlink FILENAME on the target.  Return 0, or -1 if an error
1599    occurs (and set *TARGET_ERRNO).  */
1600 extern int target_fileio_unlink (const char *filename, int *target_errno);
1601
1602 /* Read value of symbolic link FILENAME on the target.  Return a
1603    null-terminated string allocated via xmalloc, or NULL if an error
1604    occurs (and set *TARGET_ERRNO).  */
1605 extern char *target_fileio_readlink (const char *filename, int *target_errno);
1606
1607 /* Read target file FILENAME.  The return value will be -1 if the transfer
1608    fails or is not supported; 0 if the object is empty; or the length
1609    of the object otherwise.  If a positive value is returned, a
1610    sufficiently large buffer will be allocated using xmalloc and
1611    returned in *BUF_P containing the contents of the object.
1612
1613    This method should be used for objects sufficiently small to store
1614    in a single xmalloc'd buffer, when no fixed bound on the object's
1615    size is known in advance.  */
1616 extern LONGEST target_fileio_read_alloc (const char *filename,
1617                                          gdb_byte **buf_p);
1618
1619 /* Read target file FILENAME.  The result is NUL-terminated and
1620    returned as a string, allocated using xmalloc.  If an error occurs
1621    or the transfer is unsupported, NULL is returned.  Empty objects
1622    are returned as allocated but empty strings.  A warning is issued
1623    if the result contains any embedded NUL bytes.  */
1624 extern char *target_fileio_read_stralloc (const char *filename);
1625
1626
1627 /* Tracepoint-related operations.  */
1628
1629 #define target_trace_init() \
1630   (*current_target.to_trace_init) ()
1631
1632 #define target_download_tracepoint(t) \
1633   (*current_target.to_download_tracepoint) (t)
1634
1635 #define target_can_download_tracepoint() \
1636   (*current_target.to_can_download_tracepoint) ()
1637
1638 #define target_download_trace_state_variable(tsv) \
1639   (*current_target.to_download_trace_state_variable) (tsv)
1640
1641 #define target_enable_tracepoint(loc) \
1642   (*current_target.to_enable_tracepoint) (loc)
1643
1644 #define target_disable_tracepoint(loc) \
1645   (*current_target.to_disable_tracepoint) (loc)
1646
1647 #define target_trace_start() \
1648   (*current_target.to_trace_start) ()
1649
1650 #define target_trace_set_readonly_regions() \
1651   (*current_target.to_trace_set_readonly_regions) ()
1652
1653 #define target_get_trace_status(ts) \
1654   (*current_target.to_get_trace_status) (ts)
1655
1656 #define target_get_tracepoint_status(tp,utp)            \
1657   (*current_target.to_get_tracepoint_status) (tp, utp)
1658
1659 #define target_trace_stop() \
1660   (*current_target.to_trace_stop) ()
1661
1662 #define target_trace_find(type,num,addr1,addr2,tpp) \
1663   (*current_target.to_trace_find) ((type), (num), (addr1), (addr2), (tpp))
1664
1665 #define target_get_trace_state_variable_value(tsv,val) \
1666   (*current_target.to_get_trace_state_variable_value) ((tsv), (val))
1667
1668 #define target_save_trace_data(filename) \
1669   (*current_target.to_save_trace_data) (filename)
1670
1671 #define target_upload_tracepoints(utpp) \
1672   (*current_target.to_upload_tracepoints) (utpp)
1673
1674 #define target_upload_trace_state_variables(utsvp) \
1675   (*current_target.to_upload_trace_state_variables) (utsvp)
1676
1677 #define target_get_raw_trace_data(buf,offset,len) \
1678   (*current_target.to_get_raw_trace_data) ((buf), (offset), (len))
1679
1680 #define target_get_min_fast_tracepoint_insn_len() \
1681   (*current_target.to_get_min_fast_tracepoint_insn_len) ()
1682
1683 #define target_set_disconnected_tracing(val) \
1684   (*current_target.to_set_disconnected_tracing) (val)
1685
1686 #define target_set_circular_trace_buffer(val)   \
1687   (*current_target.to_set_circular_trace_buffer) (val)
1688
1689 #define target_set_trace_notes(user,notes,stopnotes)            \
1690   (*current_target.to_set_trace_notes) ((user), (notes), (stopnotes))
1691
1692 #define target_get_tib_address(ptid, addr) \
1693   (*current_target.to_get_tib_address) ((ptid), (addr))
1694
1695 #define target_set_permissions() \
1696   (*current_target.to_set_permissions) ()
1697
1698 #define target_static_tracepoint_marker_at(addr, marker) \
1699   (*current_target.to_static_tracepoint_marker_at) (addr, marker)
1700
1701 #define target_static_tracepoint_markers_by_strid(marker_id) \
1702   (*current_target.to_static_tracepoint_markers_by_strid) (marker_id)
1703
1704 #define target_traceframe_info() \
1705   (*current_target.to_traceframe_info) ()
1706
1707 #define target_use_agent(use) \
1708   (*current_target.to_use_agent) (use)
1709
1710 #define target_can_use_agent() \
1711   (*current_target.to_can_use_agent) ()
1712
1713 /* Command logging facility.  */
1714
1715 #define target_log_command(p)                                           \
1716   do                                                                    \
1717     if (current_target.to_log_command)                                  \
1718       (*current_target.to_log_command) (p);                             \
1719   while (0)
1720
1721
1722 extern int target_core_of_thread (ptid_t ptid);
1723
1724 /* Verify that the memory in the [MEMADDR, MEMADDR+SIZE) range matches
1725    the contents of [DATA,DATA+SIZE).  Returns 1 if there's a match, 0
1726    if there's a mismatch, and -1 if an error is encountered while
1727    reading memory.  Throws an error if the functionality is found not
1728    to be supported by the current target.  */
1729 int target_verify_memory (const gdb_byte *data,
1730                           CORE_ADDR memaddr, ULONGEST size);
1731
1732 /* Routines for maintenance of the target structures...
1733
1734    add_target:   Add a target to the list of all possible targets.
1735
1736    push_target:  Make this target the top of the stack of currently used
1737    targets, within its particular stratum of the stack.  Result
1738    is 0 if now atop the stack, nonzero if not on top (maybe
1739    should warn user).
1740
1741    unpush_target: Remove this from the stack of currently used targets,
1742    no matter where it is on the list.  Returns 0 if no
1743    change, 1 if removed from stack.
1744
1745    pop_target:   Remove the top thing on the stack of current targets.  */
1746
1747 extern void add_target (struct target_ops *);
1748
1749 extern void push_target (struct target_ops *);
1750
1751 extern int unpush_target (struct target_ops *);
1752
1753 extern void target_pre_inferior (int);
1754
1755 extern void target_preopen (int);
1756
1757 extern void pop_target (void);
1758
1759 /* Does whatever cleanup is required to get rid of all pushed targets.
1760    QUITTING is propagated to target_close; it indicates that GDB is
1761    exiting and should not get hung on an error (otherwise it is
1762    important to perform clean termination, even if it takes a
1763    while).  */
1764 extern void pop_all_targets (int quitting);
1765
1766 /* Like pop_all_targets, but pops only targets whose stratum is
1767    strictly above ABOVE_STRATUM.  */
1768 extern void pop_all_targets_above (enum strata above_stratum, int quitting);
1769
1770 extern int target_is_pushed (struct target_ops *t);
1771
1772 extern CORE_ADDR target_translate_tls_address (struct objfile *objfile,
1773                                                CORE_ADDR offset);
1774
1775 /* Struct target_section maps address ranges to file sections.  It is
1776    mostly used with BFD files, but can be used without (e.g. for handling
1777    raw disks, or files not in formats handled by BFD).  */
1778
1779 struct target_section
1780   {
1781     CORE_ADDR addr;             /* Lowest address in section */
1782     CORE_ADDR endaddr;          /* 1+highest address in section */
1783
1784     struct bfd_section *the_bfd_section;
1785
1786     bfd *bfd;                   /* BFD file pointer */
1787   };
1788
1789 /* Holds an array of target sections.  Defined by [SECTIONS..SECTIONS_END[.  */
1790
1791 struct target_section_table
1792 {
1793   struct target_section *sections;
1794   struct target_section *sections_end;
1795 };
1796
1797 /* Return the "section" containing the specified address.  */
1798 struct target_section *target_section_by_addr (struct target_ops *target,
1799                                                CORE_ADDR addr);
1800
1801 /* Return the target section table this target (or the targets
1802    beneath) currently manipulate.  */
1803
1804 extern struct target_section_table *target_get_section_table
1805   (struct target_ops *target);
1806
1807 /* From mem-break.c */
1808
1809 extern int memory_remove_breakpoint (struct gdbarch *,
1810                                      struct bp_target_info *);
1811
1812 extern int memory_insert_breakpoint (struct gdbarch *,
1813                                      struct bp_target_info *);
1814
1815 extern int default_memory_remove_breakpoint (struct gdbarch *,
1816                                              struct bp_target_info *);
1817
1818 extern int default_memory_insert_breakpoint (struct gdbarch *,
1819                                              struct bp_target_info *);
1820
1821
1822 /* From target.c */
1823
1824 extern void initialize_targets (void);
1825
1826 extern void noprocess (void) ATTRIBUTE_NORETURN;
1827
1828 extern void target_require_runnable (void);
1829
1830 extern void find_default_attach (struct target_ops *, char *, int);
1831
1832 extern void find_default_create_inferior (struct target_ops *,
1833                                           char *, char *, char **, int);
1834
1835 extern struct target_ops *find_run_target (void);
1836
1837 extern struct target_ops *find_target_beneath (struct target_ops *);
1838
1839 /* Read OS data object of type TYPE from the target, and return it in
1840    XML format.  The result is NUL-terminated and returned as a string,
1841    allocated using xmalloc.  If an error occurs or the transfer is
1842    unsupported, NULL is returned.  Empty objects are returned as
1843    allocated but empty strings.  */
1844
1845 extern char *target_get_osdata (const char *type);
1846
1847 \f
1848 /* Stuff that should be shared among the various remote targets.  */
1849
1850 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1851    information (higher values, more information).  */
1852 extern int remote_debug;
1853
1854 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1855 extern int baud_rate;
1856 /* Timeout limit for response from target.  */
1857 extern int remote_timeout;
1858
1859 \f
1860
1861 /* Set the show memory breakpoints mode to show, and installs a cleanup
1862    to restore it back to the current value.  */
1863 extern struct cleanup *make_show_memory_breakpoints_cleanup (int show);
1864
1865 extern int may_write_registers;
1866 extern int may_write_memory;
1867 extern int may_insert_breakpoints;
1868 extern int may_insert_tracepoints;
1869 extern int may_insert_fast_tracepoints;
1870 extern int may_stop;
1871
1872 extern void update_target_permissions (void);
1873
1874 \f
1875 /* Imported from machine dependent code.  */
1876
1877 /* Blank target vector entries are initialized to target_ignore.  */
1878 void target_ignore (void);
1879
1880 #endif /* !defined (TARGET_H) */