gdb/target.h

   1 /* Interface between GDB and target environments, including files and processes
   2
   3    Copyright (C) 1990-2014 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 struct dcache_struct;
  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 "target/resume.h"
  62 #include "target/wait.h"
  63 #include "target/waitstatus.h"
  64 #include "bfd.h"
  65 #include "symtab.h"
  66 #include "memattr.h"
  67 #include "vec.h"
  68 #include "gdb_signals.h"
  69 #include "btrace.h"
  70 #include "command.h"
  71
  72 enum strata
  73   {
  74     dummy_stratum,              /* The lowest of the low */
  75     file_stratum,               /* Executable files, etc */
  76     process_stratum,            /* Executing processes or core dump files */
  77     thread_stratum,             /* Executing threads */
  78     record_stratum,             /* Support record debugging */
  79     arch_stratum                /* Architecture overrides */
  80   };
  81
  82 enum thread_control_capabilities
  83   {
  84     tc_none = 0,                /* Default: can't control thread execution.  */
  85     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  86   };
  87
  88 /* The structure below stores information about a system call.
  89    It is basically used in the "catch syscall" command, and in
  90    every function that gives information about a system call.
  91
  92    It's also good to mention that its fields represent everything
  93    that we currently know about a syscall in GDB.  */
  94 struct syscall
  95   {
  96     /* The syscall number.  */
  97     int number;
  98
  99     /* The syscall name.  */
 100     const char *name;
 101   };
 102
 103 /* Return a pretty printed form of target_waitstatus.
 104    Space for the result is malloc'd, caller must free.  */
 105 extern char *target_waitstatus_to_string (const struct target_waitstatus *);
 106
 107 /* Return a pretty printed form of TARGET_OPTIONS.
 108    Space for the result is malloc'd, caller must free.  */
 109 extern char *target_options_to_string (int target_options);
 110
 111 /* Possible types of events that the inferior handler will have to
 112    deal with.  */
 113 enum inferior_event_type
 114   {
 115     /* Process a normal inferior event which will result in target_wait
 116        being called.  */
 117     INF_REG_EVENT,
 118     /* We are called because a timer went off.  */
 119     INF_TIMER,
 120     /* We are called to do stuff after the inferior stops.  */
 121     INF_EXEC_COMPLETE,
 122     /* We are called to do some stuff after the inferior stops, but we
 123        are expected to reenter the proceed() and
 124        handle_inferior_event() functions.  This is used only in case of
 125        'step n' like commands.  */
 126     INF_EXEC_CONTINUE
 127   };
 128 \f
 129 /* Target objects which can be transfered using target_read,
 130    target_write, et cetera.  */
 131
 132 enum target_object
 133 {
 134   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 135   TARGET_OBJECT_AVR,
 136   /* SPU target specific transfer.  See "spu-tdep.c".  */
 137   TARGET_OBJECT_SPU,
 138   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 139   TARGET_OBJECT_MEMORY,
 140   /* Memory, avoiding GDB's data cache and trusting the executable.
 141      Target implementations of to_xfer_partial never need to handle
 142      this object, and most callers should not use it.  */
 143   TARGET_OBJECT_RAW_MEMORY,
 144   /* Memory known to be part of the target's stack.  This is cached even
 145      if it is not in a region marked as such, since it is known to be
 146      "normal" RAM.  */
 147   TARGET_OBJECT_STACK_MEMORY,
 148   /* Memory known to be part of the target code.   This is cached even
 149      if it is not in a region marked as such.  */
 150   TARGET_OBJECT_CODE_MEMORY,
 151   /* Kernel Unwind Table.  See "ia64-tdep.c".  */
 152   TARGET_OBJECT_UNWIND_TABLE,
 153   /* Transfer auxilliary vector.  */
 154   TARGET_OBJECT_AUXV,
 155   /* StackGhost cookie.  See "sparc-tdep.c".  */
 156   TARGET_OBJECT_WCOOKIE,
 157   /* Target memory map in XML format.  */
 158   TARGET_OBJECT_MEMORY_MAP,
 159   /* Flash memory.  This object can be used to write contents to
 160      a previously erased flash memory.  Using it without erasing
 161      flash can have unexpected results.  Addresses are physical
 162      address on target, and not relative to flash start.  */
 163   TARGET_OBJECT_FLASH,
 164   /* Available target-specific features, e.g. registers and coprocessors.
 165      See "target-descriptions.c".  ANNEX should never be empty.  */
 166   TARGET_OBJECT_AVAILABLE_FEATURES,
 167   /* Currently loaded libraries, in XML format.  */
 168   TARGET_OBJECT_LIBRARIES,
 169   /* Currently loaded libraries specific for SVR4 systems, in XML format.  */
 170   TARGET_OBJECT_LIBRARIES_SVR4,
 171   /* Currently loaded libraries specific to AIX systems, in XML format.  */
 172   TARGET_OBJECT_LIBRARIES_AIX,
 173   /* Get OS specific data.  The ANNEX specifies the type (running
 174      processes, etc.).  The data being transfered is expected to follow
 175      the DTD specified in features/osdata.dtd.  */
 176   TARGET_OBJECT_OSDATA,
 177   /* Extra signal info.  Usually the contents of `siginfo_t' on unix
 178      platforms.  */
 179   TARGET_OBJECT_SIGNAL_INFO,
 180   /* The list of threads that are being debugged.  */
 181   TARGET_OBJECT_THREADS,
 182   /* Collected static trace data.  */
 183   TARGET_OBJECT_STATIC_TRACE_DATA,
 184   /* The HP-UX registers (those that can be obtained or modified by using
 185      the TT_LWP_RUREGS/TT_LWP_WUREGS ttrace requests).  */
 186   TARGET_OBJECT_HPUX_UREGS,
 187   /* The HP-UX shared library linkage pointer.  ANNEX should be a string
 188      image of the code address whose linkage pointer we are looking for.
 189
 190      The size of the data transfered is always 8 bytes (the size of an
 191      address on ia64).  */
 192   TARGET_OBJECT_HPUX_SOLIB_GOT,
 193   /* Traceframe info, in XML format.  */
 194   TARGET_OBJECT_TRACEFRAME_INFO,
 195   /* Load maps for FDPIC systems.  */
 196   TARGET_OBJECT_FDPIC,
 197   /* Darwin dynamic linker info data.  */
 198   TARGET_OBJECT_DARWIN_DYLD_INFO,
 199   /* OpenVMS Unwind Information Block.  */
 200   TARGET_OBJECT_OPENVMS_UIB,
 201   /* Branch trace data, in XML format.  */
 202   TARGET_OBJECT_BTRACE
 203   /* Possible future objects: TARGET_OBJECT_FILE, ...  */
 204 };
 205
 206 /* Possible values returned by target_xfer_partial, etc.  */
 207
 208 enum target_xfer_status
 209 {
 210   /* Some bytes are transferred.  */
 211   TARGET_XFER_OK = 1,
 212
 213   /* No further transfer is possible.  */
 214   TARGET_XFER_EOF = 0,
 215
 216   /* Generic I/O error.  Note that it's important that this is '-1',
 217      as we still have target_xfer-related code returning hardcoded
 218      '-1' on error.  */
 219   TARGET_XFER_E_IO = -1,
 220
 221   /* Transfer failed because the piece of the object requested is
 222      unavailable.  */
 223   TARGET_XFER_E_UNAVAILABLE = -2,
 224
 225   /* Keep list in sync with target_xfer_error_to_string.  */
 226 };
 227
 228 #define TARGET_XFER_STATUS_ERROR_P(STATUS) ((STATUS) < TARGET_XFER_EOF)
 229
 230 /* Return the string form of ERR.  */
 231
 232 extern const char *target_xfer_status_to_string (enum target_xfer_status err);
 233
 234 /* Enumeration of the kinds of traceframe searches that a target may
 235    be able to perform.  */
 236
 237 enum trace_find_type
 238   {
 239     tfind_number,
 240     tfind_pc,
 241     tfind_tp,
 242     tfind_range,
 243     tfind_outside,
 244   };
 245
 246 typedef struct static_tracepoint_marker *static_tracepoint_marker_p;
 247 DEF_VEC_P(static_tracepoint_marker_p);
 248
 249 typedef enum target_xfer_status
 250   target_xfer_partial_ftype (struct target_ops *ops,
 251                              enum target_object object,
 252                              const char *annex,
 253                              gdb_byte *readbuf,
 254                              const gdb_byte *writebuf,
 255                              ULONGEST offset,
 256                              ULONGEST len,
 257                              ULONGEST *xfered_len);
 258
 259 /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 260    OBJECT.  The OFFSET, for a seekable object, specifies the
 261    starting point.  The ANNEX can be used to provide additional
 262    data-specific information to the target.
 263
 264    Return the number of bytes actually transfered, or a negative error
 265    code (an 'enum target_xfer_error' value) if the transfer is not
 266    supported or otherwise fails.  Return of a positive value less than
 267    LEN indicates that no further transfer is possible.  Unlike the raw
 268    to_xfer_partial interface, callers of these functions do not need
 269    to retry partial transfers.  */
 270
 271 extern LONGEST target_read (struct target_ops *ops,
 272                             enum target_object object,
 273                             const char *annex, gdb_byte *buf,
 274                             ULONGEST offset, LONGEST len);
 275
 276 struct memory_read_result
 277   {
 278     /* First address that was read.  */
 279     ULONGEST begin;
 280     /* Past-the-end address.  */
 281     ULONGEST end;
 282     /* The data.  */
 283     gdb_byte *data;
 284 };
 285 typedef struct memory_read_result memory_read_result_s;
 286 DEF_VEC_O(memory_read_result_s);
 287
 288 extern void free_memory_read_result_vector (void *);
 289
 290 extern VEC(memory_read_result_s)* read_memory_robust (struct target_ops *ops,
 291                                                       ULONGEST offset,
 292                                                       LONGEST len);
 293
 294 extern LONGEST target_write (struct target_ops *ops,
 295                              enum target_object object,
 296                              const char *annex, const gdb_byte *buf,
 297                              ULONGEST offset, LONGEST len);
 298
 299 /* Similar to target_write, except that it also calls PROGRESS with
 300    the number of bytes written and the opaque BATON after every
 301    successful partial write (and before the first write).  This is
 302    useful for progress reporting and user interaction while writing
 303    data.  To abort the transfer, the progress callback can throw an
 304    exception.  */
 305
 306 LONGEST target_write_with_progress (struct target_ops *ops,
 307                                     enum target_object object,
 308                                     const char *annex, const gdb_byte *buf,
 309                                     ULONGEST offset, LONGEST len,
 310                                     void (*progress) (ULONGEST, void *),
 311                                     void *baton);
 312
 313 /* Wrapper to perform a full read of unknown size.  OBJECT/ANNEX will
 314    be read using OPS.  The return value will be -1 if the transfer
 315    fails or is not supported; 0 if the object is empty; or the length
 316    of the object otherwise.  If a positive value is returned, a
 317    sufficiently large buffer will be allocated using xmalloc and
 318    returned in *BUF_P containing the contents of the object.
 319
 320    This method should be used for objects sufficiently small to store
 321    in a single xmalloc'd buffer, when no fixed bound on the object's
 322    size is known in advance.  Don't try to read TARGET_OBJECT_MEMORY
 323    through this function.  */
 324
 325 extern LONGEST target_read_alloc (struct target_ops *ops,
 326                                   enum target_object object,
 327                                   const char *annex, gdb_byte **buf_p);
 328
 329 /* Read OBJECT/ANNEX using OPS.  The result is NUL-terminated and
 330    returned as a string, allocated using xmalloc.  If an error occurs
 331    or the transfer is unsupported, NULL is returned.  Empty objects
 332    are returned as allocated but empty strings.  A warning is issued
 333    if the result contains any embedded NUL bytes.  */
 334
 335 extern char *target_read_stralloc (struct target_ops *ops,
 336                                    enum target_object object,
 337                                    const char *annex);
 338
 339 /* See target_ops->to_xfer_partial.  */
 340 extern target_xfer_partial_ftype target_xfer_partial;
 341
 342 /* Wrappers to target read/write that perform memory transfers.  They
 343    throw an error if the memory transfer fails.
 344
 345    NOTE: cagney/2003-10-23: The naming schema is lifted from
 346    "frame.h".  The parameter order is lifted from get_frame_memory,
 347    which in turn lifted it from read_memory.  */
 348
 349 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 350                                gdb_byte *buf, LONGEST len);
 351 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 352                                             CORE_ADDR addr, int len,
 353                                             enum bfd_endian byte_order);
 354 \f
 355 struct thread_info;             /* fwd decl for parameter list below: */
 356
 357 /* The type of the callback to the to_async method.  */
 358
 359 typedef void async_callback_ftype (enum inferior_event_type event_type,
 360                                    void *context);
 361
 362 /* These defines are used to mark target_ops methods.  The script
 363    make-target-delegates scans these and auto-generates the base
 364    method implementations.  There are four macros that can be used:
 365
 366    1. TARGET_DEFAULT_IGNORE.  There is no argument.  The base method
 367    does nothing.  This is only valid if the method return type is
 368    'void'.
 369
 370    2. TARGET_DEFAULT_NORETURN.  The argument is a function call, like
 371    'tcomplain ()'.  The base method simply makes this call, which is
 372    assumed not to return.
 373
 374    3. TARGET_DEFAULT_RETURN.  The argument is a C expression.  The
 375    base method returns this expression's value.
 376
 377    4. TARGET_DEFAULT_FUNC.  The argument is the name of a function.
 378    make-target-delegates does not generate a base method in this case,
 379    but instead uses the argument function as the base method.  */
 380
 381 #define TARGET_DEFAULT_IGNORE()
 382 #define TARGET_DEFAULT_NORETURN(ARG)
 383 #define TARGET_DEFAULT_RETURN(ARG)
 384 #define TARGET_DEFAULT_FUNC(ARG)
 385
 386 struct target_ops
 387   {
 388     struct target_ops *beneath; /* To the target under this one.  */
 389     char *to_shortname;         /* Name this target type */
 390     char *to_longname;          /* Name for printing */
 391     char *to_doc;               /* Documentation.  Does not include trailing
 392                                    newline, and starts with a one-line descrip-
 393                                    tion (probably similar to to_longname).  */
 394     /* Per-target scratch pad.  */
 395     void *to_data;
 396     /* The open routine takes the rest of the parameters from the
 397        command, and (if successful) pushes a new target onto the
 398        stack.  Targets should supply this routine, if only to provide
 399        an error message.  */
 400     void (*to_open) (char *, int);
 401     /* Old targets with a static target vector provide "to_close".
 402        New re-entrant targets provide "to_xclose" and that is expected
 403        to xfree everything (including the "struct target_ops").  */
 404     void (*to_xclose) (struct target_ops *targ);
 405     void (*to_close) (struct target_ops *);
 406     void (*to_attach) (struct target_ops *ops, char *, int);
 407     void (*to_post_attach) (struct target_ops *, int);
 408     void (*to_detach) (struct target_ops *ops, const char *, int);
 409     void (*to_disconnect) (struct target_ops *, char *, int);
 410     void (*to_resume) (struct target_ops *, ptid_t, int, enum gdb_signal)
 411       TARGET_DEFAULT_NORETURN (noprocess ());
 412     ptid_t (*to_wait) (struct target_ops *,
 413                        ptid_t, struct target_waitstatus *, int)
 414       TARGET_DEFAULT_NORETURN (noprocess ());
 415     void (*to_fetch_registers) (struct target_ops *, struct regcache *, int);
 416     void (*to_store_registers) (struct target_ops *, struct regcache *, int)
 417       TARGET_DEFAULT_NORETURN (noprocess ());
 418     void (*to_prepare_to_store) (struct target_ops *, struct regcache *);
 419
 420     /* Transfer LEN bytes of memory between GDB address MYADDR and
 421        target address MEMADDR.  If WRITE, transfer them to the target, else
 422        transfer them from the target.  TARGET is the target from which we
 423        get this function.
 424
 425        Return value, N, is one of the following:
 426
 427        0 means that we can't handle this.  If errno has been set, it is the
 428        error which prevented us from doing it (FIXME: What about bfd_error?).
 429
 430        positive (call it N) means that we have transferred N bytes
 431        starting at MEMADDR.  We might be able to handle more bytes
 432        beyond this length, but no promises.
 433
 434        negative (call its absolute value N) means that we cannot
 435        transfer right at MEMADDR, but we could transfer at least
 436        something at MEMADDR + N.
 437
 438        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 439        to_xfer_partial and inferior inheritance.  */
 440
 441     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 442                                    int len, int write,
 443                                    struct mem_attrib *attrib,
 444                                    struct target_ops *target);
 445
 446     void (*to_files_info) (struct target_ops *);
 447     int (*to_insert_breakpoint) (struct target_ops *, struct gdbarch *,
 448                                  struct bp_target_info *)
 449       TARGET_DEFAULT_FUNC (memory_insert_breakpoint);
 450     int (*to_remove_breakpoint) (struct target_ops *, struct gdbarch *,
 451                                  struct bp_target_info *)
 452       TARGET_DEFAULT_FUNC (memory_remove_breakpoint);
 453     int (*to_can_use_hw_breakpoint) (struct target_ops *, int, int, int);
 454     int (*to_ranged_break_num_registers) (struct target_ops *);
 455     int (*to_insert_hw_breakpoint) (struct target_ops *,
 456                                     struct gdbarch *, struct bp_target_info *);
 457     int (*to_remove_hw_breakpoint) (struct target_ops *,
 458                                     struct gdbarch *, struct bp_target_info *);
 459
 460     /* Documentation of what the two routines below are expected to do is
 461        provided with the corresponding target_* macros.  */
 462     int (*to_remove_watchpoint) (struct target_ops *,
 463                                  CORE_ADDR, int, int, struct expression *);
 464     int (*to_insert_watchpoint) (struct target_ops *,
 465                                  CORE_ADDR, int, int, struct expression *);
 466
 467     int (*to_insert_mask_watchpoint) (struct target_ops *,
 468                                       CORE_ADDR, CORE_ADDR, int);
 469     int (*to_remove_mask_watchpoint) (struct target_ops *,
 470                                       CORE_ADDR, CORE_ADDR, int);
 471     int (*to_stopped_by_watchpoint) (struct target_ops *)
 472       TARGET_DEFAULT_RETURN (0);
 473     int to_have_steppable_watchpoint;
 474     int to_have_continuable_watchpoint;
 475     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *)
 476       TARGET_DEFAULT_RETURN (0);
 477     int (*to_watchpoint_addr_within_range) (struct target_ops *,
 478                                             CORE_ADDR, CORE_ADDR, int);
 479
 480     /* Documentation of this routine is provided with the corresponding
 481        target_* macro.  */
 482     int (*to_region_ok_for_hw_watchpoint) (struct target_ops *,
 483                                            CORE_ADDR, int);
 484
 485     int (*to_can_accel_watchpoint_condition) (struct target_ops *,
 486                                               CORE_ADDR, int, int,
 487                                               struct expression *);
 488     int (*to_masked_watch_num_registers) (struct target_ops *,
 489                                           CORE_ADDR, CORE_ADDR);
 490     void (*to_terminal_init) (struct target_ops *);
 491     void (*to_terminal_inferior) (struct target_ops *);
 492     void (*to_terminal_ours_for_output) (struct target_ops *);
 493     void (*to_terminal_ours) (struct target_ops *);
 494     void (*to_terminal_save_ours) (struct target_ops *);
 495     void (*to_terminal_info) (struct target_ops *, const char *, int);
 496     void (*to_kill) (struct target_ops *);
 497     void (*to_load) (struct target_ops *, char *, int);
 498     void (*to_create_inferior) (struct target_ops *,
 499                                 char *, char *, char **, int);
 500     void (*to_post_startup_inferior) (struct target_ops *, ptid_t);
 501     int (*to_insert_fork_catchpoint) (int);
 502     int (*to_remove_fork_catchpoint) (int);
 503     int (*to_insert_vfork_catchpoint) (int);
 504     int (*to_remove_vfork_catchpoint) (int);
 505     int (*to_follow_fork) (struct target_ops *, int, int);
 506     int (*to_insert_exec_catchpoint) (int);
 507     int (*to_remove_exec_catchpoint) (int);
 508     int (*to_set_syscall_catchpoint) (int, int, int, int, int *);
 509     int (*to_has_exited) (int, int, int *);
 510     void (*to_mourn_inferior) (struct target_ops *);
 511     int (*to_can_run) (void);
 512
 513     /* Documentation of this routine is provided with the corresponding
 514        target_* macro.  */
 515     void (*to_pass_signals) (int, unsigned char *);
 516
 517     /* Documentation of this routine is provided with the
 518        corresponding target_* function.  */
 519     void (*to_program_signals) (int, unsigned char *);
 520
 521     int (*to_thread_alive) (struct target_ops *, ptid_t ptid);
 522     void (*to_find_new_threads) (struct target_ops *);
 523     char *(*to_pid_to_str) (struct target_ops *, ptid_t);
 524     char *(*to_extra_thread_info) (struct thread_info *);
 525     char *(*to_thread_name) (struct thread_info *);
 526     void (*to_stop) (ptid_t);
 527     void (*to_rcmd) (char *command, struct ui_file *output);
 528     char *(*to_pid_to_exec_file) (int pid);
 529     void (*to_log_command) (const char *);
 530     struct target_section_table *(*to_get_section_table) (struct target_ops *);
 531     enum strata to_stratum;
 532     int (*to_has_all_memory) (struct target_ops *);
 533     int (*to_has_memory) (struct target_ops *);
 534     int (*to_has_stack) (struct target_ops *);
 535     int (*to_has_registers) (struct target_ops *);
 536     int (*to_has_execution) (struct target_ops *, ptid_t);
 537     int to_has_thread_control;  /* control thread execution */
 538     int to_attach_no_wait;
 539     /* ASYNC target controls */
 540     int (*to_can_async_p) (struct target_ops *)
 541       TARGET_DEFAULT_FUNC (find_default_can_async_p);
 542     int (*to_is_async_p) (struct target_ops *)
 543       TARGET_DEFAULT_FUNC (find_default_is_async_p);
 544     void (*to_async) (struct target_ops *, async_callback_ftype *, void *)
 545       TARGET_DEFAULT_NORETURN (tcomplain ());
 546     int (*to_supports_non_stop) (void);
 547     /* find_memory_regions support method for gcore */
 548     int (*to_find_memory_regions) (find_memory_region_ftype func, void *data);
 549     /* make_corefile_notes support method for gcore */
 550     char * (*to_make_corefile_notes) (bfd *, int *);
 551     /* get_bookmark support method for bookmarks */
 552     gdb_byte * (*to_get_bookmark) (char *, int);
 553     /* goto_bookmark support method for bookmarks */
 554     void (*to_goto_bookmark) (gdb_byte *, int);
 555     /* Return the thread-local address at OFFSET in the
 556        thread-local storage for the thread PTID and the shared library
 557        or executable file given by OBJFILE.  If that block of
 558        thread-local storage hasn't been allocated yet, this function
 559        may return an error.  */
 560     CORE_ADDR (*to_get_thread_local_address) (struct target_ops *ops,
 561                                               ptid_t ptid,
 562                                               CORE_ADDR load_module_addr,
 563                                               CORE_ADDR offset);
 564
 565     /* Request that OPS transfer up to LEN 8-bit bytes of the target's
 566        OBJECT.  The OFFSET, for a seekable object, specifies the
 567        starting point.  The ANNEX can be used to provide additional
 568        data-specific information to the target.
 569
 570        Return the transferred status, error or OK (an
 571        'enum target_xfer_status' value).  Save the number of bytes
 572        actually transferred in *XFERED_LEN if transfer is successful
 573        (TARGET_XFER_OK) or the number unavailable bytes if the requested
 574        data is unavailable (TARGET_XFER_E_UNAVAILABLE).  *XFERED_LEN
 575        smaller than LEN does not indicate the end of the object, only
 576        the end of the transfer; higher level code should continue
 577        transferring if desired.  This is handled in target.c.
 578
 579        The interface does not support a "retry" mechanism.  Instead it
 580        assumes that at least one byte will be transfered on each
 581        successful call.
 582
 583        NOTE: cagney/2003-10-17: The current interface can lead to
 584        fragmented transfers.  Lower target levels should not implement
 585        hacks, such as enlarging the transfer, in an attempt to
 586        compensate for this.  Instead, the target stack should be
 587        extended so that it implements supply/collect methods and a
 588        look-aside object cache.  With that available, the lowest
 589        target can safely and freely "push" data up the stack.
 590
 591        See target_read and target_write for more information.  One,
 592        and only one, of readbuf or writebuf must be non-NULL.  */
 593
 594     enum target_xfer_status (*to_xfer_partial) (struct target_ops *ops,
 595                                                 enum target_object object,
 596                                                 const char *annex,
 597                                                 gdb_byte *readbuf,
 598                                                 const gdb_byte *writebuf,
 599                                                 ULONGEST offset, ULONGEST len,
 600                                                 ULONGEST *xfered_len)
 601       TARGET_DEFAULT_RETURN (TARGET_XFER_E_IO);
 602
 603     /* Returns the memory map for the target.  A return value of NULL
 604        means that no memory map is available.  If a memory address
 605        does not fall within any returned regions, it's assumed to be
 606        RAM.  The returned memory regions should not overlap.
 607
 608        The order of regions does not matter; target_memory_map will
 609        sort regions by starting address.  For that reason, this
 610        function should not be called directly except via
 611        target_memory_map.
 612
 613        This method should not cache data; if the memory map could
 614        change unexpectedly, it should be invalidated, and higher
 615        layers will re-fetch it.  */
 616     VEC(mem_region_s) *(*to_memory_map) (struct target_ops *);
 617
 618     /* Erases the region of flash memory starting at ADDRESS, of
 619        length LENGTH.
 620
 621        Precondition: both ADDRESS and ADDRESS+LENGTH should be aligned
 622        on flash block boundaries, as reported by 'to_memory_map'.  */
 623     void (*to_flash_erase) (struct target_ops *,
 624                            ULONGEST address, LONGEST length);
 625
 626     /* Finishes a flash memory write sequence.  After this operation
 627        all flash memory should be available for writing and the result
 628        of reading from areas written by 'to_flash_write' should be
 629        equal to what was written.  */
 630     void (*to_flash_done) (struct target_ops *);
 631
 632     /* Describe the architecture-specific features of this target.
 633        Returns the description found, or NULL if no description
 634        was available.  */
 635     const struct target_desc *(*to_read_description) (struct target_ops *ops);
 636
 637     /* Build the PTID of the thread on which a given task is running,
 638        based on LWP and THREAD.  These values are extracted from the
 639        task Private_Data section of the Ada Task Control Block, and
 640        their interpretation depends on the target.  */
 641     ptid_t (*to_get_ada_task_ptid) (long lwp, long thread);
 642
 643     /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
 644        Return 0 if *READPTR is already at the end of the buffer.
 645        Return -1 if there is insufficient buffer for a whole entry.
 646        Return 1 if an entry was read into *TYPEP and *VALP.  */
 647     int (*to_auxv_parse) (struct target_ops *ops, gdb_byte **readptr,
 648                          gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp);
 649
 650     /* Search SEARCH_SPACE_LEN bytes beginning at START_ADDR for the
 651        sequence of bytes in PATTERN with length PATTERN_LEN.
 652
 653        The result is 1 if found, 0 if not found, and -1 if there was an error
 654        requiring halting of the search (e.g. memory read error).
 655        If the pattern is found the address is recorded in FOUND_ADDRP.  */
 656     int (*to_search_memory) (struct target_ops *ops,
 657                              CORE_ADDR start_addr, ULONGEST search_space_len,
 658                              const gdb_byte *pattern, ULONGEST pattern_len,
 659                              CORE_ADDR *found_addrp);
 660
 661     /* Can target execute in reverse?  */
 662     int (*to_can_execute_reverse) (void);
 663
 664     /* The direction the target is currently executing.  Must be
 665        implemented on targets that support reverse execution and async
 666        mode.  The default simply returns forward execution.  */
 667     enum exec_direction_kind (*to_execution_direction) (void);
 668
 669     /* Does this target support debugging multiple processes
 670        simultaneously?  */
 671     int (*to_supports_multi_process) (void);
 672
 673     /* Does this target support enabling and disabling tracepoints while a trace
 674        experiment is running?  */
 675     int (*to_supports_enable_disable_tracepoint) (void);
 676
 677     /* Does this target support disabling address space randomization?  */
 678     int (*to_supports_disable_randomization) (void);
 679
 680     /* Does this target support the tracenz bytecode for string collection?  */
 681     int (*to_supports_string_tracing) (void);
 682
 683     /* Does this target support evaluation of breakpoint conditions on its
 684        end?  */
 685     int (*to_supports_evaluation_of_breakpoint_conditions) (void);
 686
 687     /* Does this target support evaluation of breakpoint commands on its
 688        end?  */
 689     int (*to_can_run_breakpoint_commands) (void);
 690
 691     /* Determine current architecture of thread PTID.
 692
 693        The target is supposed to determine the architecture of the code where
 694        the target is currently stopped at (on Cell, if a target is in spu_run,
 695        to_thread_architecture would return SPU, otherwise PPC32 or PPC64).
 696        This is architecture used to perform decr_pc_after_break adjustment,
 697        and also determines the frame architecture of the innermost frame.
 698        ptrace operations need to operate according to target_gdbarch ().
 699
 700        The default implementation always returns target_gdbarch ().  */
 701     struct gdbarch *(*to_thread_architecture) (struct target_ops *, ptid_t);
 702
 703     /* Determine current address space of thread PTID.
 704
 705        The default implementation always returns the inferior's
 706        address space.  */
 707     struct address_space *(*to_thread_address_space) (struct target_ops *,
 708                                                       ptid_t);
 709
 710     /* Target file operations.  */
 711
 712     /* Open FILENAME on the target, using FLAGS and MODE.  Return a
 713        target file descriptor, or -1 if an error occurs (and set
 714        *TARGET_ERRNO).  */
 715     int (*to_fileio_open) (const char *filename, int flags, int mode,
 716                            int *target_errno);
 717
 718     /* Write up to LEN bytes from WRITE_BUF to FD on the target.
 719        Return the number of bytes written, or -1 if an error occurs
 720        (and set *TARGET_ERRNO).  */
 721     int (*to_fileio_pwrite) (int fd, const gdb_byte *write_buf, int len,
 722                              ULONGEST offset, int *target_errno);
 723
 724     /* Read up to LEN bytes FD on the target into READ_BUF.
 725        Return the number of bytes read, or -1 if an error occurs
 726        (and set *TARGET_ERRNO).  */
 727     int (*to_fileio_pread) (int fd, gdb_byte *read_buf, int len,
 728                             ULONGEST offset, int *target_errno);
 729
 730     /* Close FD on the target.  Return 0, or -1 if an error occurs
 731        (and set *TARGET_ERRNO).  */
 732     int (*to_fileio_close) (int fd, int *target_errno);
 733
 734     /* Unlink FILENAME on the target.  Return 0, or -1 if an error
 735        occurs (and set *TARGET_ERRNO).  */
 736     int (*to_fileio_unlink) (const char *filename, int *target_errno);
 737
 738     /* Read value of symbolic link FILENAME on the target.  Return a
 739        null-terminated string allocated via xmalloc, or NULL if an error
 740        occurs (and set *TARGET_ERRNO).  */
 741     char *(*to_fileio_readlink) (const char *filename, int *target_errno);
 742
 743
 744     /* Implement the "info proc" command.  */
 745     void (*to_info_proc) (struct target_ops *, char *, enum info_proc_what);
 746
 747     /* Tracepoint-related operations.  */
 748
 749     /* Prepare the target for a tracing run.  */
 750     void (*to_trace_init) (void);
 751
 752     /* Send full details of a tracepoint location to the target.  */
 753     void (*to_download_tracepoint) (struct bp_location *location);
 754
 755     /* Is the target able to download tracepoint locations in current
 756        state?  */
 757     int (*to_can_download_tracepoint) (void);
 758
 759     /* Send full details of a trace state variable to the target.  */
 760     void (*to_download_trace_state_variable) (struct trace_state_variable *tsv);
 761
 762     /* Enable a tracepoint on the target.  */
 763     void (*to_enable_tracepoint) (struct bp_location *location);
 764
 765     /* Disable a tracepoint on the target.  */
 766     void (*to_disable_tracepoint) (struct bp_location *location);
 767
 768     /* Inform the target info of memory regions that are readonly
 769        (such as text sections), and so it should return data from
 770        those rather than look in the trace buffer.  */
 771     void (*to_trace_set_readonly_regions) (void);
 772
 773     /* Start a trace run.  */
 774     void (*to_trace_start) (void);
 775
 776     /* Get the current status of a tracing run.  */
 777     int (*to_get_trace_status) (struct trace_status *ts);
 778
 779     void (*to_get_tracepoint_status) (struct breakpoint *tp,
 780                                       struct uploaded_tp *utp);
 781
 782     /* Stop a trace run.  */
 783     void (*to_trace_stop) (void);
 784
 785    /* Ask the target to find a trace frame of the given type TYPE,
 786       using NUM, ADDR1, and ADDR2 as search parameters.  Returns the
 787       number of the trace frame, and also the tracepoint number at
 788       TPP.  If no trace frame matches, return -1.  May throw if the
 789       operation fails.  */
 790     int (*to_trace_find) (enum trace_find_type type, int num,
 791                           CORE_ADDR addr1, CORE_ADDR addr2, int *tpp);
 792
 793     /* Get the value of the trace state variable number TSV, returning
 794        1 if the value is known and writing the value itself into the
 795        location pointed to by VAL, else returning 0.  */
 796     int (*to_get_trace_state_variable_value) (int tsv, LONGEST *val);
 797
 798     int (*to_save_trace_data) (const char *filename);
 799
 800     int (*to_upload_tracepoints) (struct uploaded_tp **utpp);
 801
 802     int (*to_upload_trace_state_variables) (struct uploaded_tsv **utsvp);
 803
 804     LONGEST (*to_get_raw_trace_data) (gdb_byte *buf,
 805                                       ULONGEST offset, LONGEST len);
 806
 807     /* Get the minimum length of instruction on which a fast tracepoint
 808        may be set on the target.  If this operation is unsupported,
 809        return -1.  If for some reason the minimum length cannot be
 810        determined, return 0.  */
 811     int (*to_get_min_fast_tracepoint_insn_len) (void);
 812
 813     /* Set the target's tracing behavior in response to unexpected
 814        disconnection - set VAL to 1 to keep tracing, 0 to stop.  */
 815     void (*to_set_disconnected_tracing) (int val);
 816     void (*to_set_circular_trace_buffer) (int val);
 817     /* Set the size of trace buffer in the target.  */
 818     void (*to_set_trace_buffer_size) (LONGEST val);
 819
 820     /* Add/change textual notes about the trace run, returning 1 if
 821        successful, 0 otherwise.  */
 822     int (*to_set_trace_notes) (const char *user, const char *notes,
 823                                const char *stopnotes);
 824
 825     /* Return the processor core that thread PTID was last seen on.
 826        This information is updated only when:
 827        - update_thread_list is called
 828        - thread stops
 829        If the core cannot be determined -- either for the specified
 830        thread, or right now, or in this debug session, or for this
 831        target -- return -1.  */
 832     int (*to_core_of_thread) (struct target_ops *, ptid_t ptid);
 833
 834     /* Verify that the memory in the [MEMADDR, MEMADDR+SIZE) range
 835        matches the contents of [DATA,DATA+SIZE).  Returns 1 if there's
 836        a match, 0 if there's a mismatch, and -1 if an error is
 837        encountered while reading memory.  */
 838     int (*to_verify_memory) (struct target_ops *, const gdb_byte *data,
 839                              CORE_ADDR memaddr, ULONGEST size);
 840
 841     /* Return the address of the start of the Thread Information Block
 842        a Windows OS specific feature.  */
 843     int (*to_get_tib_address) (ptid_t ptid, CORE_ADDR *addr);
 844
 845     /* Send the new settings of write permission variables.  */
 846     void (*to_set_permissions) (void);
 847
 848     /* Look for a static tracepoint marker at ADDR, and fill in MARKER
 849        with its details.  Return 1 on success, 0 on failure.  */
 850     int (*to_static_tracepoint_marker_at) (CORE_ADDR,
 851                                            struct static_tracepoint_marker *marker);
 852
 853     /* Return a vector of all tracepoints markers string id ID, or all
 854        markers if ID is NULL.  */
 855     VEC(static_tracepoint_marker_p) *(*to_static_tracepoint_markers_by_strid)
 856       (const char *id);
 857
 858     /* Return a traceframe info object describing the current
 859        traceframe's contents.  If the target doesn't support
 860        traceframe info, return NULL.  If the current traceframe is not
 861        selected (the current traceframe number is -1), the target can
 862        choose to return either NULL or an empty traceframe info.  If
 863        NULL is returned, for example in remote target, GDB will read
 864        from the live inferior.  If an empty traceframe info is
 865        returned, for example in tfile target, which means the
 866        traceframe info is available, but the requested memory is not
 867        available in it.  GDB will try to see if the requested memory
 868        is available in the read-only sections.  This method should not
 869        cache data; higher layers take care of caching, invalidating,
 870        and re-fetching when necessary.  */
 871     struct traceframe_info *(*to_traceframe_info) (void);
 872
 873     /* Ask the target to use or not to use agent according to USE.  Return 1
 874        successful, 0 otherwise.  */
 875     int (*to_use_agent) (int use);
 876
 877     /* Is the target able to use agent in current state?  */
 878     int (*to_can_use_agent) (void);
 879
 880     /* Check whether the target supports branch tracing.  */
 881     int (*to_supports_btrace) (struct target_ops *)
 882       TARGET_DEFAULT_RETURN (0);
 883
 884     /* Enable branch tracing for PTID and allocate a branch trace target
 885        information struct for reading and for disabling branch trace.  */
 886     struct btrace_target_info *(*to_enable_btrace) (ptid_t ptid);
 887
 888     /* Disable branch tracing and deallocate TINFO.  */
 889     void (*to_disable_btrace) (struct btrace_target_info *tinfo);
 890
 891     /* Disable branch tracing and deallocate TINFO.  This function is similar
 892        to to_disable_btrace, except that it is called during teardown and is
 893        only allowed to perform actions that are safe.  A counter-example would
 894        be attempting to talk to a remote target.  */
 895     void (*to_teardown_btrace) (struct btrace_target_info *tinfo);
 896
 897     /* Read branch trace data for the thread indicated by BTINFO into DATA.
 898        DATA is cleared before new trace is added.
 899        The branch trace will start with the most recent block and continue
 900        towards older blocks.  */
 901     enum btrace_error (*to_read_btrace) (VEC (btrace_block_s) **data,
 902                                          struct btrace_target_info *btinfo,
 903                                          enum btrace_read_type type);
 904
 905     /* Stop trace recording.  */
 906     void (*to_stop_recording) (void);
 907
 908     /* Print information about the recording.  */
 909     void (*to_info_record) (void);
 910
 911     /* Save the recorded execution trace into a file.  */
 912     void (*to_save_record) (const char *filename);
 913
 914     /* Delete the recorded execution trace from the current position onwards.  */
 915     void (*to_delete_record) (void);
 916
 917     /* Query if the record target is currently replaying.  */
 918     int (*to_record_is_replaying) (void);
 919
 920     /* Go to the begin of the execution trace.  */
 921     void (*to_goto_record_begin) (void);
 922
 923     /* Go to the end of the execution trace.  */
 924     void (*to_goto_record_end) (void);
 925
 926     /* Go to a specific location in the recorded execution trace.  */
 927     void (*to_goto_record) (ULONGEST insn);
 928
 929     /* Disassemble SIZE instructions in the recorded execution trace from
 930        the current position.
 931        If SIZE < 0, disassemble abs (SIZE) preceding instructions; otherwise,
 932        disassemble SIZE succeeding instructions.  */
 933     void (*to_insn_history) (int size, int flags);
 934
 935     /* Disassemble SIZE instructions in the recorded execution trace around
 936        FROM.
 937        If SIZE < 0, disassemble abs (SIZE) instructions before FROM; otherwise,
 938        disassemble SIZE instructions after FROM.  */
 939     void (*to_insn_history_from) (ULONGEST from, int size, int flags);
 940
 941     /* Disassemble a section of the recorded execution trace from instruction
 942        BEGIN (inclusive) to instruction END (inclusive).  */
 943     void (*to_insn_history_range) (ULONGEST begin, ULONGEST end, int flags);
 944
 945     /* Print a function trace of the recorded execution trace.
 946        If SIZE < 0, print abs (SIZE) preceding functions; otherwise, print SIZE
 947        succeeding functions.  */
 948     void (*to_call_history) (int size, int flags);
 949
 950     /* Print a function trace of the recorded execution trace starting
 951        at function FROM.
 952        If SIZE < 0, print abs (SIZE) functions before FROM; otherwise, print
 953        SIZE functions after FROM.  */
 954     void (*to_call_history_from) (ULONGEST begin, int size, int flags);
 955
 956     /* Print a function trace of an execution trace section from function BEGIN
 957        (inclusive) to function END (inclusive).  */
 958     void (*to_call_history_range) (ULONGEST begin, ULONGEST end, int flags);
 959
 960     /* Nonzero if TARGET_OBJECT_LIBRARIES_SVR4 may be read with a
 961        non-empty annex.  */
 962     int (*to_augmented_libraries_svr4_read) (void);
 963
 964     /* Those unwinders are tried before any other arch unwinders.  Use NULL if
 965        it is not used.  */
 966     const struct frame_unwind *to_get_unwinder;
 967     const struct frame_unwind *to_get_tailcall_unwinder;
 968
 969     /* Return the number of bytes by which the PC needs to be decremented
 970        after executing a breakpoint instruction.
 971        Defaults to gdbarch_decr_pc_after_break (GDBARCH).  */
 972     CORE_ADDR (*to_decr_pc_after_break) (struct target_ops *ops,
 973                                          struct gdbarch *gdbarch);
 974
 975     int to_magic;
 976     /* Need sub-structure for target machine related rather than comm related?
 977      */
 978   };
 979
 980 /* Magic number for checking ops size.  If a struct doesn't end with this
 981    number, somebody changed the declaration but didn't change all the
 982    places that initialize one.  */
 983
 984 #define OPS_MAGIC       3840
 985
 986 /* The ops structure for our "current" target process.  This should
 987    never be NULL.  If there is no target, it points to the dummy_target.  */
 988
 989 extern struct target_ops current_target;
 990
 991 /* Define easy words for doing these operations on our current target.  */
 992
 993 #define target_shortname        (current_target.to_shortname)
 994 #define target_longname         (current_target.to_longname)
 995
 996 /* Does whatever cleanup is required for a target that we are no
 997    longer going to be calling.  This routine is automatically always
 998    called after popping the target off the target stack - the target's
 999    own methods are no longer available through the target vector.
1000    Closing file descriptors and freeing all memory allocated memory are
1001    typical things it should do.  */
1002
1003 void target_close (struct target_ops *targ);
1004
1005 /* Attaches to a process on the target side.  Arguments are as passed
1006    to the `attach' command by the user.  This routine can be called
1007    when the target is not on the target-stack, if the target_can_run
1008    routine returns 1; in that case, it must push itself onto the stack.
1009    Upon exit, the target should be ready for normal operations, and
1010    should be ready to deliver the status of the process immediately
1011    (without waiting) to an upcoming target_wait call.  */
1012
1013 void target_attach (char *, int);
1014
1015 /* Some targets don't generate traps when attaching to the inferior,
1016    or their target_attach implementation takes care of the waiting.
1017    These targets must set to_attach_no_wait.  */
1018
1019 #define target_attach_no_wait \
1020      (current_target.to_attach_no_wait)
1021
1022 /* The target_attach operation places a process under debugger control,
1023    and stops the process.
1024
1025    This operation provides a target-specific hook that allows the
1026    necessary bookkeeping to be performed after an attach completes.  */
1027 #define target_post_attach(pid) \
1028      (*current_target.to_post_attach) (&current_target, pid)
1029
1030 /* Takes a program previously attached to and detaches it.
1031    The program may resume execution (some targets do, some don't) and will
1032    no longer stop on signals, etc.  We better not have left any breakpoints
1033    in the program or it'll die when it hits one.  ARGS is arguments
1034    typed by the user (e.g. a signal to send the process).  FROM_TTY
1035    says whether to be verbose or not.  */
1036
1037 extern void target_detach (const char *, int);
1038
1039 /* Disconnect from the current target without resuming it (leaving it
1040    waiting for a debugger).  */
1041
1042 extern void target_disconnect (char *, int);
1043
1044 /* Resume execution of the target process PTID (or a group of
1045    threads).  STEP says whether to single-step or to run free; SIGGNAL
1046    is the signal to be given to the target, or GDB_SIGNAL_0 for no
1047    signal.  The caller may not pass GDB_SIGNAL_DEFAULT.  A specific
1048    PTID means `step/resume only this process id'.  A wildcard PTID
1049    (all threads, or all threads of process) means `step/resume
1050    INFERIOR_PTID, and let other threads (for which the wildcard PTID
1051    matches) resume with their 'thread->suspend.stop_signal' signal
1052    (usually GDB_SIGNAL_0) if it is in "pass" state, or with no signal
1053    if in "no pass" state.  */
1054
1055 extern void target_resume (ptid_t ptid, int step, enum gdb_signal signal);
1056
1057 /* Wait for process pid to do something.  PTID = -1 to wait for any
1058    pid to do something.  Return pid of child, or -1 in case of error;
1059    store status through argument pointer STATUS.  Note that it is
1060    _NOT_ OK to throw_exception() out of target_wait() without popping
1061    the debugging target from the stack; GDB isn't prepared to get back
1062    to the prompt with a debugging target but without the frame cache,
1063    stop_pc, etc., set up.  OPTIONS is a bitwise OR of TARGET_W*
1064    options.  */
1065
1066 extern ptid_t target_wait (ptid_t ptid, struct target_waitstatus *status,
1067                            int options);
1068
1069 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
1070
1071 extern void target_fetch_registers (struct regcache *regcache, int regno);
1072
1073 /* Store at least register REGNO, or all regs if REGNO == -1.
1074    It can store as many registers as it wants to, so target_prepare_to_store
1075    must have been previously called.  Calls error() if there are problems.  */
1076
1077 extern void target_store_registers (struct regcache *regcache, int regs);
1078
1079 /* Get ready to modify the registers array.  On machines which store
1080    individual registers, this doesn't need to do anything.  On machines
1081    which store all the registers in one fell swoop, this makes sure
1082    that REGISTERS contains all the registers from the program being
1083    debugged.  */
1084
1085 #define target_prepare_to_store(regcache)       \
1086      (*current_target.to_prepare_to_store) (&current_target, regcache)
1087
1088 /* Determine current address space of thread PTID.  */
1089
1090 struct address_space *target_thread_address_space (ptid_t);
1091
1092 /* Implement the "info proc" command.  This returns one if the request
1093    was handled, and zero otherwise.  It can also throw an exception if
1094    an error was encountered while attempting to handle the
1095    request.  */
1096
1097 int target_info_proc (char *, enum info_proc_what);
1098
1099 /* Returns true if this target can debug multiple processes
1100    simultaneously.  */
1101
1102 #define target_supports_multi_process() \
1103      (*current_target.to_supports_multi_process) ()
1104
1105 /* Returns true if this target can disable address space randomization.  */
1106
1107 int target_supports_disable_randomization (void);
1108
1109 /* Returns true if this target can enable and disable tracepoints
1110    while a trace experiment is running.  */
1111
1112 #define target_supports_enable_disable_tracepoint() \
1113   (*current_target.to_supports_enable_disable_tracepoint) ()
1114
1115 #define target_supports_string_tracing() \
1116   (*current_target.to_supports_string_tracing) ()
1117
1118 /* Returns true if this target can handle breakpoint conditions
1119    on its end.  */
1120
1121 #define target_supports_evaluation_of_breakpoint_conditions() \
1122   (*current_target.to_supports_evaluation_of_breakpoint_conditions) ()
1123
1124 /* Returns true if this target can handle breakpoint commands
1125    on its end.  */
1126
1127 #define target_can_run_breakpoint_commands() \
1128   (*current_target.to_can_run_breakpoint_commands) ()
1129
1130 extern int target_read_string (CORE_ADDR, char **, int, int *);
1131
1132 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr,
1133                                ssize_t len);
1134
1135 extern int target_read_raw_memory (CORE_ADDR memaddr, gdb_byte *myaddr,
1136                                    ssize_t len);
1137
1138 extern int target_read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len);
1139
1140 extern int target_read_code (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len);
1141
1142 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
1143                                 ssize_t len);
1144
1145 extern int target_write_raw_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
1146                                     ssize_t len);
1147
1148 /* Fetches the target's memory map.  If one is found it is sorted
1149    and returned, after some consistency checking.  Otherwise, NULL
1150    is returned.  */
1151 VEC(mem_region_s) *target_memory_map (void);
1152
1153 /* Erase the specified flash region.  */
1154 void target_flash_erase (ULONGEST address, LONGEST length);
1155
1156 /* Finish a sequence of flash operations.  */
1157 void target_flash_done (void);
1158
1159 /* Describes a request for a memory write operation.  */
1160 struct memory_write_request
1161   {
1162     /* Begining address that must be written.  */
1163     ULONGEST begin;
1164     /* Past-the-end address.  */
1165     ULONGEST end;
1166     /* The data to write.  */
1167     gdb_byte *data;
1168     /* A callback baton for progress reporting for this request.  */
1169     void *baton;
1170   };
1171 typedef struct memory_write_request memory_write_request_s;
1172 DEF_VEC_O(memory_write_request_s);
1173
1174 /* Enumeration specifying different flash preservation behaviour.  */
1175 enum flash_preserve_mode
1176   {
1177     flash_preserve,
1178     flash_discard
1179   };
1180
1181 /* Write several memory blocks at once.  This version can be more
1182    efficient than making several calls to target_write_memory, in
1183    particular because it can optimize accesses to flash memory.
1184
1185    Moreover, this is currently the only memory access function in gdb
1186    that supports writing to flash memory, and it should be used for
1187    all cases where access to flash memory is desirable.
1188
1189    REQUESTS is the vector (see vec.h) of memory_write_request.
1190    PRESERVE_FLASH_P indicates what to do with blocks which must be
1191      erased, but not completely rewritten.
1192    PROGRESS_CB is a function that will be periodically called to provide
1193      feedback to user.  It will be called with the baton corresponding
1194      to the request currently being written.  It may also be called
1195      with a NULL baton, when preserved flash sectors are being rewritten.
1196
1197    The function returns 0 on success, and error otherwise.  */
1198 int target_write_memory_blocks (VEC(memory_write_request_s) *requests,
1199                                 enum flash_preserve_mode preserve_flash_p,
1200                                 void (*progress_cb) (ULONGEST, void *));
1201
1202 /* Print a line about the current target.  */
1203
1204 #define target_files_info()     \
1205      (*current_target.to_files_info) (&current_target)
1206
1207 /* Insert a hardware breakpoint at address BP_TGT->placed_address in
1208    the target machine.  Returns 0 for success, and returns non-zero or
1209    throws an error (with a detailed failure reason error code and
1210    message) otherwise.  */
1211
1212 extern int target_insert_breakpoint (struct gdbarch *gdbarch,
1213                                      struct bp_target_info *bp_tgt);
1214
1215 /* Remove a breakpoint at address BP_TGT->placed_address in the target
1216    machine.  Result is 0 for success, non-zero for error.  */
1217
1218 extern int target_remove_breakpoint (struct gdbarch *gdbarch,
1219                                      struct bp_target_info *bp_tgt);
1220
1221 /* Initialize the terminal settings we record for the inferior,
1222    before we actually run the inferior.  */
1223
1224 #define target_terminal_init() \
1225      (*current_target.to_terminal_init) (&current_target)
1226
1227 /* Put the inferior's terminal settings into effect.
1228    This is preparation for starting or resuming the inferior.  */
1229
1230 extern void target_terminal_inferior (void);
1231
1232 /* Put some of our terminal settings into effect,
1233    enough to get proper results from our output,
1234    but do not change into or out of RAW mode
1235    so that no input is discarded.
1236
1237    After doing this, either terminal_ours or terminal_inferior
1238    should be called to get back to a normal state of affairs.  */
1239
1240 #define target_terminal_ours_for_output() \
1241      (*current_target.to_terminal_ours_for_output) (&current_target)
1242
1243 /* Put our terminal settings into effect.
1244    First record the inferior's terminal settings
1245    so they can be restored properly later.  */
1246
1247 #define target_terminal_ours() \
1248      (*current_target.to_terminal_ours) (&current_target)
1249
1250 /* Save our terminal settings.
1251    This is called from TUI after entering or leaving the curses
1252    mode.  Since curses modifies our terminal this call is here
1253    to take this change into account.  */
1254
1255 #define target_terminal_save_ours() \
1256      (*current_target.to_terminal_save_ours) (&current_target)
1257
1258 /* Print useful information about our terminal status, if such a thing
1259    exists.  */
1260
1261 #define target_terminal_info(arg, from_tty) \
1262      (*current_target.to_terminal_info) (&current_target, arg, from_tty)
1263
1264 /* Kill the inferior process.   Make it go away.  */
1265
1266 extern void target_kill (void);
1267
1268 /* Load an executable file into the target process.  This is expected
1269    to not only bring new code into the target process, but also to
1270    update GDB's symbol tables to match.
1271
1272    ARG contains command-line arguments, to be broken down with
1273    buildargv ().  The first non-switch argument is the filename to
1274    load, FILE; the second is a number (as parsed by strtoul (..., ...,
1275    0)), which is an offset to apply to the load addresses of FILE's
1276    sections.  The target may define switches, or other non-switch
1277    arguments, as it pleases.  */
1278
1279 extern void target_load (char *arg, int from_tty);
1280
1281 /* Start an inferior process and set inferior_ptid to its pid.
1282    EXEC_FILE is the file to run.
1283    ALLARGS is a string containing the arguments to the program.
1284    ENV is the environment vector to pass.  Errors reported with error().
1285    On VxWorks and various standalone systems, we ignore exec_file.  */
1286
1287 void target_create_inferior (char *exec_file, char *args,
1288                              char **env, int from_tty);
1289
1290 /* Some targets (such as ttrace-based HPUX) don't allow us to request
1291    notification of inferior events such as fork and vork immediately
1292    after the inferior is created.  (This because of how gdb gets an
1293    inferior created via invoking a shell to do it.  In such a scenario,
1294    if the shell init file has commands in it, the shell will fork and
1295    exec for each of those commands, and we will see each such fork
1296    event.  Very bad.)
1297
1298    Such targets will supply an appropriate definition for this function.  */
1299
1300 #define target_post_startup_inferior(ptid) \
1301      (*current_target.to_post_startup_inferior) (&current_target, ptid)
1302
1303 /* On some targets, we can catch an inferior fork or vfork event when
1304    it occurs.  These functions insert/remove an already-created
1305    catchpoint for such events.  They return  0 for success, 1 if the
1306    catchpoint type is not supported and -1 for failure.  */
1307
1308 #define target_insert_fork_catchpoint(pid) \
1309      (*current_target.to_insert_fork_catchpoint) (pid)
1310
1311 #define target_remove_fork_catchpoint(pid) \
1312      (*current_target.to_remove_fork_catchpoint) (pid)
1313
1314 #define target_insert_vfork_catchpoint(pid) \
1315      (*current_target.to_insert_vfork_catchpoint) (pid)
1316
1317 #define target_remove_vfork_catchpoint(pid) \
1318      (*current_target.to_remove_vfork_catchpoint) (pid)
1319
1320 /* If the inferior forks or vforks, this function will be called at
1321    the next resume in order to perform any bookkeeping and fiddling
1322    necessary to continue debugging either the parent or child, as
1323    requested, and releasing the other.  Information about the fork
1324    or vfork event is available via get_last_target_status ().
1325    This function returns 1 if the inferior should not be resumed
1326    (i.e. there is another event pending).  */
1327
1328 int target_follow_fork (int follow_child, int detach_fork);
1329
1330 /* On some targets, we can catch an inferior exec event when it
1331    occurs.  These functions insert/remove an already-created
1332    catchpoint for such events.  They return  0 for success, 1 if the
1333    catchpoint type is not supported and -1 for failure.  */
1334
1335 #define target_insert_exec_catchpoint(pid) \
1336      (*current_target.to_insert_exec_catchpoint) (pid)
1337
1338 #define target_remove_exec_catchpoint(pid) \
1339      (*current_target.to_remove_exec_catchpoint) (pid)
1340
1341 /* Syscall catch.
1342
1343    NEEDED is nonzero if any syscall catch (of any kind) is requested.
1344    If NEEDED is zero, it means the target can disable the mechanism to
1345    catch system calls because there are no more catchpoints of this type.
1346
1347    ANY_COUNT is nonzero if a generic (filter-less) syscall catch is
1348    being requested.  In this case, both TABLE_SIZE and TABLE should
1349    be ignored.
1350
1351    TABLE_SIZE is the number of elements in TABLE.  It only matters if
1352    ANY_COUNT is zero.
1353
1354    TABLE is an array of ints, indexed by syscall number.  An element in
1355    this array is nonzero if that syscall should be caught.  This argument
1356    only matters if ANY_COUNT is zero.
1357
1358    Return 0 for success, 1 if syscall catchpoints are not supported or -1
1359    for failure.  */
1360
1361 #define target_set_syscall_catchpoint(pid, needed, any_count, table_size, table) \
1362      (*current_target.to_set_syscall_catchpoint) (pid, needed, any_count, \
1363                                                   table_size, table)
1364
1365 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
1366    exit code of PID, if any.  */
1367
1368 #define target_has_exited(pid,wait_status,exit_status) \
1369      (*current_target.to_has_exited) (pid,wait_status,exit_status)
1370
1371 /* The debugger has completed a blocking wait() call.  There is now
1372    some process event that must be processed.  This function should
1373    be defined by those targets that require the debugger to perform
1374    cleanup or internal state changes in response to the process event.  */
1375
1376 /* The inferior process has died.  Do what is right.  */
1377
1378 void target_mourn_inferior (void);
1379
1380 /* Does target have enough data to do a run or attach command? */
1381
1382 #define target_can_run(t) \
1383      ((t)->to_can_run) ()
1384
1385 /* Set list of signals to be handled in the target.
1386
1387    PASS_SIGNALS is an array of size NSIG, indexed by target signal number
1388    (enum gdb_signal).  For every signal whose entry in this array is
1389    non-zero, the target is allowed -but not required- to skip reporting
1390    arrival of the signal to the GDB core by returning from target_wait,
1391    and to pass the signal directly to the inferior instead.
1392
1393    However, if the target is hardware single-stepping a thread that is
1394    about to receive a signal, it needs to be reported in any case, even
1395    if mentioned in a previous target_pass_signals call.   */
1396
1397 extern void target_pass_signals (int nsig, unsigned char *pass_signals);
1398
1399 /* Set list of signals the target may pass to the inferior.  This
1400    directly maps to the "handle SIGNAL pass/nopass" setting.
1401
1402    PROGRAM_SIGNALS is an array of size NSIG, indexed by target signal
1403    number (enum gdb_signal).  For every signal whose entry in this
1404    array is non-zero, the target is allowed to pass the signal to the
1405    inferior.  Signals not present in the array shall be silently
1406    discarded.  This does not influence whether to pass signals to the
1407    inferior as a result of a target_resume call.  This is useful in
1408    scenarios where the target needs to decide whether to pass or not a
1409    signal to the inferior without GDB core involvement, such as for
1410    example, when detaching (as threads may have been suspended with
1411    pending signals not reported to GDB).  */
1412
1413 extern void target_program_signals (int nsig, unsigned char *program_signals);
1414
1415 /* Check to see if a thread is still alive.  */
1416
1417 extern int target_thread_alive (ptid_t ptid);
1418
1419 /* Query for new threads and add them to the thread list.  */
1420
1421 extern void target_find_new_threads (void);
1422
1423 /* Make target stop in a continuable fashion.  (For instance, under
1424    Unix, this should act like SIGSTOP).  This function is normally
1425    used by GUIs to implement a stop button.  */
1426
1427 extern void target_stop (ptid_t ptid);
1428
1429 /* Send the specified COMMAND to the target's monitor
1430    (shell,interpreter) for execution.  The result of the query is
1431    placed in OUTBUF.  */
1432
1433 #define target_rcmd(command, outbuf) \
1434      (*current_target.to_rcmd) (command, outbuf)
1435
1436
1437 /* Does the target include all of memory, or only part of it?  This
1438    determines whether we look up the target chain for other parts of
1439    memory if this target can't satisfy a request.  */
1440
1441 extern int target_has_all_memory_1 (void);
1442 #define target_has_all_memory target_has_all_memory_1 ()
1443
1444 /* Does the target include memory?  (Dummy targets don't.)  */
1445
1446 extern int target_has_memory_1 (void);
1447 #define target_has_memory target_has_memory_1 ()
1448
1449 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
1450    we start a process.)  */
1451
1452 extern int target_has_stack_1 (void);
1453 #define target_has_stack target_has_stack_1 ()
1454
1455 /* Does the target have registers?  (Exec files don't.)  */
1456
1457 extern int target_has_registers_1 (void);
1458 #define target_has_registers target_has_registers_1 ()
1459
1460 /* Does the target have execution?  Can we make it jump (through
1461    hoops), or pop its stack a few times?  This means that the current
1462    target is currently executing; for some targets, that's the same as
1463    whether or not the target is capable of execution, but there are
1464    also targets which can be current while not executing.  In that
1465    case this will become true after target_create_inferior or
1466    target_attach.  */
1467
1468 extern int target_has_execution_1 (ptid_t);
1469
1470 /* Like target_has_execution_1, but always passes inferior_ptid.  */
1471
1472 extern int target_has_execution_current (void);
1473
1474 #define target_has_execution target_has_execution_current ()
1475
1476 /* Default implementations for process_stratum targets.  Return true
1477    if there's a selected inferior, false otherwise.  */
1478
1479 extern int default_child_has_all_memory (struct target_ops *ops);
1480 extern int default_child_has_memory (struct target_ops *ops);
1481 extern int default_child_has_stack (struct target_ops *ops);
1482 extern int default_child_has_registers (struct target_ops *ops);
1483 extern int default_child_has_execution (struct target_ops *ops,
1484                                         ptid_t the_ptid);
1485
1486 /* Can the target support the debugger control of thread execution?
1487    Can it lock the thread scheduler?  */
1488
1489 #define target_can_lock_scheduler \
1490      (current_target.to_has_thread_control & tc_schedlock)
1491
1492 /* Should the target enable async mode if it is supported?  Temporary
1493    cludge until async mode is a strict superset of sync mode.  */
1494 extern int target_async_permitted;
1495
1496 /* Can the target support asynchronous execution?  */
1497 #define target_can_async_p() (current_target.to_can_async_p (&current_target))
1498
1499 /* Is the target in asynchronous execution mode?  */
1500 #define target_is_async_p() (current_target.to_is_async_p (&current_target))
1501
1502 int target_supports_non_stop (void);
1503
1504 /* Put the target in async mode with the specified callback function.  */
1505 #define target_async(CALLBACK,CONTEXT) \
1506      (current_target.to_async (&current_target, (CALLBACK), (CONTEXT)))
1507
1508 #define target_execution_direction() \
1509   (current_target.to_execution_direction ())
1510
1511 /* Converts a process id to a string.  Usually, the string just contains
1512    `process xyz', but on some systems it may contain
1513    `process xyz thread abc'.  */
1514
1515 extern char *target_pid_to_str (ptid_t ptid);
1516
1517 extern char *normal_pid_to_str (ptid_t ptid);
1518
1519 /* Return a short string describing extra information about PID,
1520    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
1521    is okay.  */
1522
1523 #define target_extra_thread_info(TP) \
1524      (current_target.to_extra_thread_info (TP))
1525
1526 /* Return the thread's name.  A NULL result means that the target
1527    could not determine this thread's name.  */
1528
1529 extern char *target_thread_name (struct thread_info *);
1530
1531 /* Attempts to find the pathname of the executable file
1532    that was run to create a specified process.
1533
1534    The process PID must be stopped when this operation is used.
1535
1536    If the executable file cannot be determined, NULL is returned.
1537
1538    Else, a pointer to a character string containing the pathname
1539    is returned.  This string should be copied into a buffer by
1540    the client if the string will not be immediately used, or if
1541    it must persist.  */
1542
1543 #define target_pid_to_exec_file(pid) \
1544      (current_target.to_pid_to_exec_file) (pid)
1545
1546 /* See the to_thread_architecture description in struct target_ops.  */
1547
1548 #define target_thread_architecture(ptid) \
1549      (current_target.to_thread_architecture (&current_target, ptid))
1550
1551 /*
1552  * Iterator function for target memory regions.
1553  * Calls a callback function once for each memory region 'mapped'
1554  * in the child process.  Defined as a simple macro rather than
1555  * as a function macro so that it can be tested for nullity.
1556  */
1557
1558 #define target_find_memory_regions(FUNC, DATA) \
1559      (current_target.to_find_memory_regions) (FUNC, DATA)
1560
1561 /*
1562  * Compose corefile .note section.
1563  */
1564
1565 #define target_make_corefile_notes(BFD, SIZE_P) \
1566      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1567
1568 /* Bookmark interfaces.  */
1569 #define target_get_bookmark(ARGS, FROM_TTY) \
1570      (current_target.to_get_bookmark) (ARGS, FROM_TTY)
1571
1572 #define target_goto_bookmark(ARG, FROM_TTY) \
1573      (current_target.to_goto_bookmark) (ARG, FROM_TTY)
1574
1575 /* Hardware watchpoint interfaces.  */
1576
1577 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1578    write).  Only the INFERIOR_PTID task is being queried.  */
1579
1580 #define target_stopped_by_watchpoint()          \
1581   ((*current_target.to_stopped_by_watchpoint) (&current_target))
1582
1583 /* Non-zero if we have steppable watchpoints  */
1584
1585 #define target_have_steppable_watchpoint \
1586    (current_target.to_have_steppable_watchpoint)
1587
1588 /* Non-zero if we have continuable watchpoints  */
1589
1590 #define target_have_continuable_watchpoint \
1591    (current_target.to_have_continuable_watchpoint)
1592
1593 /* Provide defaults for hardware watchpoint functions.  */
1594
1595 /* If the *_hw_beakpoint functions have not been defined
1596    elsewhere use the definitions in the target vector.  */
1597
1598 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1599    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1600    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1601    (including this one?).  OTHERTYPE is who knows what...  */
1602
1603 #define target_can_use_hardware_watchpoint(TYPE,CNT,OTHERTYPE) \
1604  (*current_target.to_can_use_hw_breakpoint) (&current_target,  \
1605                                              TYPE, CNT, OTHERTYPE);
1606
1607 /* Returns the number of debug registers needed to watch the given
1608    memory region, or zero if not supported.  */
1609
1610 #define target_region_ok_for_hw_watchpoint(addr, len) \
1611     (*current_target.to_region_ok_for_hw_watchpoint) (&current_target,  \
1612                                                       addr, len)
1613
1614
1615 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.
1616    TYPE is 0 for write, 1 for read, and 2 for read/write accesses.
1617    COND is the expression for its condition, or NULL if there's none.
1618    Returns 0 for success, 1 if the watchpoint type is not supported,
1619    -1 for failure.  */
1620
1621 #define target_insert_watchpoint(addr, len, type, cond) \
1622      (*current_target.to_insert_watchpoint) (&current_target,   \
1623                                              addr, len, type, cond)
1624
1625 #define target_remove_watchpoint(addr, len, type, cond) \
1626      (*current_target.to_remove_watchpoint) (&current_target,   \
1627                                              addr, len, type, cond)
1628
1629 /* Insert a new masked watchpoint at ADDR using the mask MASK.
1630    RW may be hw_read for a read watchpoint, hw_write for a write watchpoint
1631    or hw_access for an access watchpoint.  Returns 0 for success, 1 if
1632    masked watchpoints are not supported, -1 for failure.  */
1633
1634 extern int target_insert_mask_watchpoint (CORE_ADDR, CORE_ADDR, int);
1635
1636 /* Remove a masked watchpoint at ADDR with the mask MASK.
1637    RW may be hw_read for a read watchpoint, hw_write for a write watchpoint
1638    or hw_access for an access watchpoint.  Returns 0 for success, non-zero
1639    for failure.  */
1640
1641 extern int target_remove_mask_watchpoint (CORE_ADDR, CORE_ADDR, int);
1642
1643 /* Insert a hardware breakpoint at address BP_TGT->placed_address in
1644    the target machine.  Returns 0 for success, and returns non-zero or
1645    throws an error (with a detailed failure reason error code and
1646    message) otherwise.  */
1647
1648 #define target_insert_hw_breakpoint(gdbarch, bp_tgt) \
1649      (*current_target.to_insert_hw_breakpoint) (&current_target,        \
1650                                                 gdbarch, bp_tgt)
1651
1652 #define target_remove_hw_breakpoint(gdbarch, bp_tgt) \
1653      (*current_target.to_remove_hw_breakpoint) (&current_target,        \
1654                                                 gdbarch, bp_tgt)
1655
1656 /* Return number of debug registers needed for a ranged breakpoint,
1657    or -1 if ranged breakpoints are not supported.  */
1658
1659 extern int target_ranged_break_num_registers (void);
1660
1661 /* Return non-zero if target knows the data address which triggered this
1662    target_stopped_by_watchpoint, in such case place it to *ADDR_P.  Only the
1663    INFERIOR_PTID task is being queried.  */
1664 #define target_stopped_data_address(target, addr_p) \
1665     (*target.to_stopped_data_address) (target, addr_p)
1666
1667 /* Return non-zero if ADDR is within the range of a watchpoint spanning
1668    LENGTH bytes beginning at START.  */
1669 #define target_watchpoint_addr_within_range(target, addr, start, length) \
1670   (*target.to_watchpoint_addr_within_range) (target, addr, start, length)
1671
1672 /* Return non-zero if the target is capable of using hardware to evaluate
1673    the condition expression.  In this case, if the condition is false when
1674    the watched memory location changes, execution may continue without the
1675    debugger being notified.
1676
1677    Due to limitations in the hardware implementation, it may be capable of
1678    avoiding triggering the watchpoint in some cases where the condition
1679    expression is false, but may report some false positives as well.
1680    For this reason, GDB will still evaluate the condition expression when
1681    the watchpoint triggers.  */
1682 #define target_can_accel_watchpoint_condition(addr, len, type, cond) \
1683   (*current_target.to_can_accel_watchpoint_condition) (&current_target, \
1684                                                        addr, len, type, cond)
1685
1686 /* Return number of debug registers needed for a masked watchpoint,
1687    -1 if masked watchpoints are not supported or -2 if the given address
1688    and mask combination cannot be used.  */
1689
1690 extern int target_masked_watch_num_registers (CORE_ADDR addr, CORE_ADDR mask);
1691
1692 /* Target can execute in reverse?  */
1693 #define target_can_execute_reverse \
1694      (current_target.to_can_execute_reverse ? \
1695       current_target.to_can_execute_reverse () : 0)
1696
1697 extern const struct target_desc *target_read_description (struct target_ops *);
1698
1699 #define target_get_ada_task_ptid(lwp, tid) \
1700      (*current_target.to_get_ada_task_ptid) (lwp,tid)
1701
1702 /* Utility implementation of searching memory.  */
1703 extern int simple_search_memory (struct target_ops* ops,
1704                                  CORE_ADDR start_addr,
1705                                  ULONGEST search_space_len,
1706                                  const gdb_byte *pattern,
1707                                  ULONGEST pattern_len,
1708                                  CORE_ADDR *found_addrp);
1709
1710 /* Main entry point for searching memory.  */
1711 extern int target_search_memory (CORE_ADDR start_addr,
1712                                  ULONGEST search_space_len,
1713                                  const gdb_byte *pattern,
1714                                  ULONGEST pattern_len,
1715                                  CORE_ADDR *found_addrp);
1716
1717 /* Target file operations.  */
1718
1719 /* Open FILENAME on the target, using FLAGS and MODE.  Return a
1720    target file descriptor, or -1 if an error occurs (and set
1721    *TARGET_ERRNO).  */
1722 extern int target_fileio_open (const char *filename, int flags, int mode,
1723                                int *target_errno);
1724
1725 /* Write up to LEN bytes from WRITE_BUF to FD on the target.
1726    Return the number of bytes written, or -1 if an error occurs
1727    (and set *TARGET_ERRNO).  */
1728 extern int target_fileio_pwrite (int fd, const gdb_byte *write_buf, int len,
1729                                  ULONGEST offset, int *target_errno);
1730
1731 /* Read up to LEN bytes FD on the target into READ_BUF.
1732    Return the number of bytes read, or -1 if an error occurs
1733    (and set *TARGET_ERRNO).  */
1734 extern int target_fileio_pread (int fd, gdb_byte *read_buf, int len,
1735                                 ULONGEST offset, int *target_errno);
1736
1737 /* Close FD on the target.  Return 0, or -1 if an error occurs
1738    (and set *TARGET_ERRNO).  */
1739 extern int target_fileio_close (int fd, int *target_errno);
1740
1741 /* Unlink FILENAME on the target.  Return 0, or -1 if an error
1742    occurs (and set *TARGET_ERRNO).  */
1743 extern int target_fileio_unlink (const char *filename, int *target_errno);
1744
1745 /* Read value of symbolic link FILENAME on the target.  Return a
1746    null-terminated string allocated via xmalloc, or NULL if an error
1747    occurs (and set *TARGET_ERRNO).  */
1748 extern char *target_fileio_readlink (const char *filename, int *target_errno);
1749
1750 /* Read target file FILENAME.  The return value will be -1 if the transfer
1751    fails or is not supported; 0 if the object is empty; or the length
1752    of the object otherwise.  If a positive value is returned, a
1753    sufficiently large buffer will be allocated using xmalloc and
1754    returned in *BUF_P containing the contents of the object.
1755
1756    This method should be used for objects sufficiently small to store
1757    in a single xmalloc'd buffer, when no fixed bound on the object's
1758    size is known in advance.  */
1759 extern LONGEST target_fileio_read_alloc (const char *filename,
1760                                          gdb_byte **buf_p);
1761
1762 /* Read target file FILENAME.  The result is NUL-terminated and
1763    returned as a string, allocated using xmalloc.  If an error occurs
1764    or the transfer is unsupported, NULL is returned.  Empty objects
1765    are returned as allocated but empty strings.  A warning is issued
1766    if the result contains any embedded NUL bytes.  */
1767 extern char *target_fileio_read_stralloc (const char *filename);
1768
1769
1770 /* Tracepoint-related operations.  */
1771
1772 #define target_trace_init() \
1773   (*current_target.to_trace_init) ()
1774
1775 #define target_download_tracepoint(t) \
1776   (*current_target.to_download_tracepoint) (t)
1777
1778 #define target_can_download_tracepoint() \
1779   (*current_target.to_can_download_tracepoint) ()
1780
1781 #define target_download_trace_state_variable(tsv) \
1782   (*current_target.to_download_trace_state_variable) (tsv)
1783
1784 #define target_enable_tracepoint(loc) \
1785   (*current_target.to_enable_tracepoint) (loc)
1786
1787 #define target_disable_tracepoint(loc) \
1788   (*current_target.to_disable_tracepoint) (loc)
1789
1790 #define target_trace_start() \
1791   (*current_target.to_trace_start) ()
1792
1793 #define target_trace_set_readonly_regions() \
1794   (*current_target.to_trace_set_readonly_regions) ()
1795
1796 #define target_get_trace_status(ts) \
1797   (*current_target.to_get_trace_status) (ts)
1798
1799 #define target_get_tracepoint_status(tp,utp)            \
1800   (*current_target.to_get_tracepoint_status) (tp, utp)
1801
1802 #define target_trace_stop() \
1803   (*current_target.to_trace_stop) ()
1804
1805 #define target_trace_find(type,num,addr1,addr2,tpp) \
1806   (*current_target.to_trace_find) ((type), (num), (addr1), (addr2), (tpp))
1807
1808 #define target_get_trace_state_variable_value(tsv,val) \
1809   (*current_target.to_get_trace_state_variable_value) ((tsv), (val))
1810
1811 #define target_save_trace_data(filename) \
1812   (*current_target.to_save_trace_data) (filename)
1813
1814 #define target_upload_tracepoints(utpp) \
1815   (*current_target.to_upload_tracepoints) (utpp)
1816
1817 #define target_upload_trace_state_variables(utsvp) \
1818   (*current_target.to_upload_trace_state_variables) (utsvp)
1819
1820 #define target_get_raw_trace_data(buf,offset,len) \
1821   (*current_target.to_get_raw_trace_data) ((buf), (offset), (len))
1822
1823 #define target_get_min_fast_tracepoint_insn_len() \
1824   (*current_target.to_get_min_fast_tracepoint_insn_len) ()
1825
1826 #define target_set_disconnected_tracing(val) \
1827   (*current_target.to_set_disconnected_tracing) (val)
1828
1829 #define target_set_circular_trace_buffer(val)   \
1830   (*current_target.to_set_circular_trace_buffer) (val)
1831
1832 #define target_set_trace_buffer_size(val)       \
1833   (*current_target.to_set_trace_buffer_size) (val)
1834
1835 #define target_set_trace_notes(user,notes,stopnotes)            \
1836   (*current_target.to_set_trace_notes) ((user), (notes), (stopnotes))
1837
1838 #define target_get_tib_address(ptid, addr) \
1839   (*current_target.to_get_tib_address) ((ptid), (addr))
1840
1841 #define target_set_permissions() \
1842   (*current_target.to_set_permissions) ()
1843
1844 #define target_static_tracepoint_marker_at(addr, marker) \
1845   (*current_target.to_static_tracepoint_marker_at) (addr, marker)
1846
1847 #define target_static_tracepoint_markers_by_strid(marker_id) \
1848   (*current_target.to_static_tracepoint_markers_by_strid) (marker_id)
1849
1850 #define target_traceframe_info() \
1851   (*current_target.to_traceframe_info) ()
1852
1853 #define target_use_agent(use) \
1854   (*current_target.to_use_agent) (use)
1855
1856 #define target_can_use_agent() \
1857   (*current_target.to_can_use_agent) ()
1858
1859 #define target_augmented_libraries_svr4_read() \
1860   (*current_target.to_augmented_libraries_svr4_read) ()
1861
1862 /* Command logging facility.  */
1863
1864 #define target_log_command(p)                                           \
1865   do                                                                    \
1866     if (current_target.to_log_command)                                  \
1867       (*current_target.to_log_command) (p);                             \
1868   while (0)
1869
1870
1871 extern int target_core_of_thread (ptid_t ptid);
1872
1873 /* See to_get_unwinder in struct target_ops.  */
1874 extern const struct frame_unwind *target_get_unwinder (void);
1875
1876 /* See to_get_tailcall_unwinder in struct target_ops.  */
1877 extern const struct frame_unwind *target_get_tailcall_unwinder (void);
1878
1879 /* Verify that the memory in the [MEMADDR, MEMADDR+SIZE) range matches
1880    the contents of [DATA,DATA+SIZE).  Returns 1 if there's a match, 0
1881    if there's a mismatch, and -1 if an error is encountered while
1882    reading memory.  Throws an error if the functionality is found not
1883    to be supported by the current target.  */
1884 int target_verify_memory (const gdb_byte *data,
1885                           CORE_ADDR memaddr, ULONGEST size);
1886
1887 /* Routines for maintenance of the target structures...
1888
1889    complete_target_initialization: Finalize a target_ops by filling in
1890    any fields needed by the target implementation.
1891
1892    add_target:   Add a target to the list of all possible targets.
1893
1894    push_target:  Make this target the top of the stack of currently used
1895    targets, within its particular stratum of the stack.  Result
1896    is 0 if now atop the stack, nonzero if not on top (maybe
1897    should warn user).
1898
1899    unpush_target: Remove this from the stack of currently used targets,
1900    no matter where it is on the list.  Returns 0 if no
1901    change, 1 if removed from stack.  */
1902
1903 extern void add_target (struct target_ops *);
1904
1905 extern void add_target_with_completer (struct target_ops *t,
1906                                        completer_ftype *completer);
1907
1908 extern void complete_target_initialization (struct target_ops *t);
1909
1910 /* Adds a command ALIAS for target T and marks it deprecated.  This is useful
1911    for maintaining backwards compatibility when renaming targets.  */
1912
1913 extern void add_deprecated_target_alias (struct target_ops *t, char *alias);
1914
1915 extern void push_target (struct target_ops *);
1916
1917 extern int unpush_target (struct target_ops *);
1918
1919 extern void target_pre_inferior (int);
1920
1921 extern void target_preopen (int);
1922
1923 /* Does whatever cleanup is required to get rid of all pushed targets.  */
1924 extern void pop_all_targets (void);
1925
1926 /* Like pop_all_targets, but pops only targets whose stratum is
1927    strictly above ABOVE_STRATUM.  */
1928 extern void pop_all_targets_above (enum strata above_stratum);
1929
1930 extern int target_is_pushed (struct target_ops *t);
1931
1932 extern CORE_ADDR target_translate_tls_address (struct objfile *objfile,
1933                                                CORE_ADDR offset);
1934
1935 /* Struct target_section maps address ranges to file sections.  It is
1936    mostly used with BFD files, but can be used without (e.g. for handling
1937    raw disks, or files not in formats handled by BFD).  */
1938
1939 struct target_section
1940   {
1941     CORE_ADDR addr;             /* Lowest address in section */
1942     CORE_ADDR endaddr;          /* 1+highest address in section */
1943
1944     struct bfd_section *the_bfd_section;
1945
1946     /* The "owner" of the section.
1947        It can be any unique value.  It is set by add_target_sections
1948        and used by remove_target_sections.
1949        For example, for executables it is a pointer to exec_bfd and
1950        for shlibs it is the so_list pointer.  */
1951     void *owner;
1952   };
1953
1954 /* Holds an array of target sections.  Defined by [SECTIONS..SECTIONS_END[.  */
1955
1956 struct target_section_table
1957 {
1958   struct target_section *sections;
1959   struct target_section *sections_end;
1960 };
1961
1962 /* Return the "section" containing the specified address.  */
1963 struct target_section *target_section_by_addr (struct target_ops *target,
1964                                                CORE_ADDR addr);
1965
1966 /* Return the target section table this target (or the targets
1967    beneath) currently manipulate.  */
1968
1969 extern struct target_section_table *target_get_section_table
1970   (struct target_ops *target);
1971
1972 /* From mem-break.c */
1973
1974 extern int memory_remove_breakpoint (struct target_ops *, struct gdbarch *,
1975                                      struct bp_target_info *);
1976
1977 extern int memory_insert_breakpoint (struct target_ops *, struct gdbarch *,
1978                                      struct bp_target_info *);
1979
1980 extern int default_memory_remove_breakpoint (struct gdbarch *,
1981                                              struct bp_target_info *);
1982
1983 extern int default_memory_insert_breakpoint (struct gdbarch *,
1984                                              struct bp_target_info *);
1985
1986
1987 /* From target.c */
1988
1989 extern void initialize_targets (void);
1990
1991 extern void noprocess (void) ATTRIBUTE_NORETURN;
1992
1993 extern void target_require_runnable (void);
1994
1995 extern void find_default_attach (struct target_ops *, char *, int);
1996
1997 extern void find_default_create_inferior (struct target_ops *,
1998                                           char *, char *, char **, int);
1999
2000 extern struct target_ops *find_target_beneath (struct target_ops *);
2001
2002 /* Find the target at STRATUM.  If no target is at that stratum,
2003    return NULL.  */
2004
2005 struct target_ops *find_target_at (enum strata stratum);
2006
2007 /* Read OS data object of type TYPE from the target, and return it in
2008    XML format.  The result is NUL-terminated and returned as a string,
2009    allocated using xmalloc.  If an error occurs or the transfer is
2010    unsupported, NULL is returned.  Empty objects are returned as
2011    allocated but empty strings.  */
2012
2013 extern char *target_get_osdata (const char *type);
2014
2015 \f
2016 /* Stuff that should be shared among the various remote targets.  */
2017
2018 /* Debugging level.  0 is off, and non-zero values mean to print some debug
2019    information (higher values, more information).  */
2020 extern int remote_debug;
2021
2022 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
2023 extern int baud_rate;
2024 /* Timeout limit for response from target.  */
2025 extern int remote_timeout;
2026
2027 \f
2028
2029 /* Set the show memory breakpoints mode to show, and installs a cleanup
2030    to restore it back to the current value.  */
2031 extern struct cleanup *make_show_memory_breakpoints_cleanup (int show);
2032
2033 extern int may_write_registers;
2034 extern int may_write_memory;
2035 extern int may_insert_breakpoints;
2036 extern int may_insert_tracepoints;
2037 extern int may_insert_fast_tracepoints;
2038 extern int may_stop;
2039
2040 extern void update_target_permissions (void);
2041
2042 \f
2043 /* Imported from machine dependent code.  */
2044
2045 /* Blank target vector entries are initialized to target_ignore.  */
2046 void target_ignore (void);
2047
2048 /* See to_supports_btrace in struct target_ops.  */
2049 #define target_supports_btrace() \
2050   (current_target.to_supports_btrace (&current_target))
2051
2052 /* See to_enable_btrace in struct target_ops.  */
2053 extern struct btrace_target_info *target_enable_btrace (ptid_t ptid);
2054
2055 /* See to_disable_btrace in struct target_ops.  */
2056 extern void target_disable_btrace (struct btrace_target_info *btinfo);
2057
2058 /* See to_teardown_btrace in struct target_ops.  */
2059 extern void target_teardown_btrace (struct btrace_target_info *btinfo);
2060
2061 /* See to_read_btrace in struct target_ops.  */
2062 extern enum btrace_error target_read_btrace (VEC (btrace_block_s) **,
2063                                              struct btrace_target_info *,
2064                                              enum btrace_read_type);
2065
2066 /* See to_stop_recording in struct target_ops.  */
2067 extern void target_stop_recording (void);
2068
2069 /* See to_info_record in struct target_ops.  */
2070 extern void target_info_record (void);
2071
2072 /* See to_save_record in struct target_ops.  */
2073 extern void target_save_record (const char *filename);
2074
2075 /* Query if the target supports deleting the execution log.  */
2076 extern int target_supports_delete_record (void);
2077
2078 /* See to_delete_record in struct target_ops.  */
2079 extern void target_delete_record (void);
2080
2081 /* See to_record_is_replaying in struct target_ops.  */
2082 extern int target_record_is_replaying (void);
2083
2084 /* See to_goto_record_begin in struct target_ops.  */
2085 extern void target_goto_record_begin (void);
2086
2087 /* See to_goto_record_end in struct target_ops.  */
2088 extern void target_goto_record_end (void);
2089
2090 /* See to_goto_record in struct target_ops.  */
2091 extern void target_goto_record (ULONGEST insn);
2092
2093 /* See to_insn_history.  */
2094 extern void target_insn_history (int size, int flags);
2095
2096 /* See to_insn_history_from.  */
2097 extern void target_insn_history_from (ULONGEST from, int size, int flags);
2098
2099 /* See to_insn_history_range.  */
2100 extern void target_insn_history_range (ULONGEST begin, ULONGEST end, int flags);
2101
2102 /* See to_call_history.  */
2103 extern void target_call_history (int size, int flags);
2104
2105 /* See to_call_history_from.  */
2106 extern void target_call_history_from (ULONGEST begin, int size, int flags);
2107
2108 /* See to_call_history_range.  */
2109 extern void target_call_history_range (ULONGEST begin, ULONGEST end, int flags);
2110
2111 /* See to_decr_pc_after_break.  Start searching for the target at OPS.  */
2112 extern CORE_ADDR forward_target_decr_pc_after_break (struct target_ops *ops,
2113                                                      struct gdbarch *gdbarch);
2114
2115 /* See to_decr_pc_after_break.  */
2116 extern CORE_ADDR target_decr_pc_after_break (struct gdbarch *gdbarch);
2117
2118 #endif /* !defined (TARGET_H) */