gdb/gdbserver/target.h

   1 /* Target operations for the remote server for GDB.
   2    Copyright (C) 2002-2015 Free Software Foundation, Inc.
   3
   4    Contributed by MontaVista Software.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef TARGET_H
  22 #define TARGET_H
  23
  24 #include "target/target.h"
  25 #include "target/resume.h"
  26 #include "target/wait.h"
  27 #include "target/waitstatus.h"
  28 #include "mem-break.h"
  29 #include "btrace-common.h"
  30
  31 struct emit_ops;
  32 struct buffer;
  33 struct process_info;
  34
  35 /* This structure describes how to resume a particular thread (or all
  36    threads) based on the client's request.  If thread is -1, then this
  37    entry applies to all threads.  These are passed around as an
  38    array.  */
  39
  40 struct thread_resume
  41 {
  42   ptid_t thread;
  43
  44   /* How to "resume".  */
  45   enum resume_kind kind;
  46
  47   /* If non-zero, send this signal when we resume, or to stop the
  48      thread.  If stopping a thread, and this is 0, the target should
  49      stop the thread however it best decides to (e.g., SIGSTOP on
  50      linux; SuspendThread on win32).  This is a host signal value (not
  51      enum gdb_signal).  */
  52   int sig;
  53
  54   /* Range to single step within.  Valid only iff KIND is resume_step.
  55
  56      Single-step once, and then continuing stepping as long as the
  57      thread stops in this range.  (If the range is empty
  58      [STEP_RANGE_START == STEP_RANGE_END], then this is a single-step
  59      request.)  */
  60   CORE_ADDR step_range_start;   /* Inclusive */
  61   CORE_ADDR step_range_end;     /* Exclusive */
  62 };
  63
  64 struct target_ops
  65 {
  66   /* Start a new process.
  67
  68      PROGRAM is a path to the program to execute.
  69      ARGS is a standard NULL-terminated array of arguments,
  70      to be passed to the inferior as ``argv''.
  71
  72      Returns the new PID on success, -1 on failure.  Registers the new
  73      process with the process list.  */
  74
  75   int (*create_inferior) (char *program, char **args);
  76
  77   /* Attach to a running process.
  78
  79      PID is the process ID to attach to, specified by the user
  80      or a higher layer.
  81
  82      Returns -1 if attaching is unsupported, 0 on success, and calls
  83      error() otherwise.  */
  84
  85   int (*attach) (unsigned long pid);
  86
  87   /* Kill inferior PID.  Return -1 on failure, and 0 on success.  */
  88
  89   int (*kill) (int pid);
  90
  91   /* Detach from inferior PID. Return -1 on failure, and 0 on
  92      success.  */
  93
  94   int (*detach) (int pid);
  95
  96   /* The inferior process has died.  Do what is right.  */
  97
  98   void (*mourn) (struct process_info *proc);
  99
 100   /* Wait for inferior PID to exit.  */
 101   void (*join) (int pid);
 102
 103   /* Return 1 iff the thread with process ID PID is alive.  */
 104
 105   int (*thread_alive) (ptid_t pid);
 106
 107   /* Resume the inferior process.  */
 108
 109   void (*resume) (struct thread_resume *resume_info, size_t n);
 110
 111   /* Wait for the inferior process or thread to change state.  Store
 112      status through argument pointer STATUS.
 113
 114      PTID = -1 to wait for any pid to do something, PTID(pid,0,0) to
 115      wait for any thread of process pid to do something.  Return ptid
 116      of child, or -1 in case of error; store status through argument
 117      pointer STATUS.  OPTIONS is a bit set of options defined as
 118      TARGET_W* above.  If options contains TARGET_WNOHANG and there's
 119      no child stop to report, return is
 120      null_ptid/TARGET_WAITKIND_IGNORE.  */
 121
 122   ptid_t (*wait) (ptid_t ptid, struct target_waitstatus *status, int options);
 123
 124   /* Fetch registers from the inferior process.
 125
 126      If REGNO is -1, fetch all registers; otherwise, fetch at least REGNO.  */
 127
 128   void (*fetch_registers) (struct regcache *regcache, int regno);
 129
 130   /* Store registers to the inferior process.
 131
 132      If REGNO is -1, store all registers; otherwise, store at least REGNO.  */
 133
 134   void (*store_registers) (struct regcache *regcache, int regno);
 135
 136   /* Prepare to read or write memory from the inferior process.
 137      Targets use this to do what is necessary to get the state of the
 138      inferior such that it is possible to access memory.
 139
 140      This should generally only be called from client facing routines,
 141      such as gdb_read_memory/gdb_write_memory, or the GDB breakpoint
 142      insertion routine.
 143
 144      Like `read_memory' and `write_memory' below, returns 0 on success
 145      and errno on failure.  */
 146
 147   int (*prepare_to_access_memory) (void);
 148
 149   /* Undo the effects of prepare_to_access_memory.  */
 150
 151   void (*done_accessing_memory) (void);
 152
 153   /* Read memory from the inferior process.  This should generally be
 154      called through read_inferior_memory, which handles breakpoint shadowing.
 155
 156      Read LEN bytes at MEMADDR into a buffer at MYADDR.
 157
 158      Returns 0 on success and errno on failure.  */
 159
 160   int (*read_memory) (CORE_ADDR memaddr, unsigned char *myaddr, int len);
 161
 162   /* Write memory to the inferior process.  This should generally be
 163      called through write_inferior_memory, which handles breakpoint shadowing.
 164
 165      Write LEN bytes from the buffer at MYADDR to MEMADDR.
 166
 167      Returns 0 on success and errno on failure.  */
 168
 169   int (*write_memory) (CORE_ADDR memaddr, const unsigned char *myaddr,
 170                        int len);
 171
 172   /* Query GDB for the values of any symbols we're interested in.
 173      This function is called whenever we receive a "qSymbols::"
 174      query, which corresponds to every time more symbols (might)
 175      become available.  NULL if we aren't interested in any
 176      symbols.  */
 177
 178   void (*look_up_symbols) (void);
 179
 180   /* Send an interrupt request to the inferior process,
 181      however is appropriate.  */
 182
 183   void (*request_interrupt) (void);
 184
 185   /* Read auxiliary vector data from the inferior process.
 186
 187      Read LEN bytes at OFFSET into a buffer at MYADDR.  */
 188
 189   int (*read_auxv) (CORE_ADDR offset, unsigned char *myaddr,
 190                     unsigned int len);
 191
 192   /* Returns true if GDB Z breakpoint type TYPE is supported, false
 193      otherwise.  The type is coded as follows:
 194        '0' - software-breakpoint
 195        '1' - hardware-breakpoint
 196        '2' - write watchpoint
 197        '3' - read watchpoint
 198        '4' - access watchpoint
 199   */
 200   int (*supports_z_point_type) (char z_type);
 201
 202   /* Insert and remove a break or watchpoint.
 203      Returns 0 on success, -1 on failure and 1 on unsupported.  */
 204
 205   int (*insert_point) (enum raw_bkpt_type type, CORE_ADDR addr,
 206                        int size, struct raw_breakpoint *bp);
 207   int (*remove_point) (enum raw_bkpt_type type, CORE_ADDR addr,
 208                        int size, struct raw_breakpoint *bp);
 209
 210   /* Returns 1 if the target stopped because it executed a software
 211      breakpoint instruction, 0 otherwise.  */
 212   int (*stopped_by_sw_breakpoint) (void);
 213
 214   /* Returns true if the target knows whether a trap was caused by a
 215      SW breakpoint triggering.  */
 216   int (*supports_stopped_by_sw_breakpoint) (void);
 217
 218   /* Returns 1 if the target stopped for a hardware breakpoint.  */
 219   int (*stopped_by_hw_breakpoint) (void);
 220
 221   /* Returns true if the target knows whether a trap was caused by a
 222      HW breakpoint triggering.  */
 223   int (*supports_stopped_by_hw_breakpoint) (void);
 224
 225   /* Returns true if the target can evaluate conditions of
 226      breakpoints.  */
 227   int (*supports_conditional_breakpoints) (void);
 228
 229   /* Returns 1 if target was stopped due to a watchpoint hit, 0 otherwise.  */
 230
 231   int (*stopped_by_watchpoint) (void);
 232
 233   /* Returns the address associated with the watchpoint that hit, if any;
 234      returns 0 otherwise.  */
 235
 236   CORE_ADDR (*stopped_data_address) (void);
 237
 238   /* Reports the text, data offsets of the executable.  This is
 239      needed for uclinux where the executable is relocated during load
 240      time.  */
 241
 242   int (*read_offsets) (CORE_ADDR *text, CORE_ADDR *data);
 243
 244   /* Fetch the address associated with a specific thread local storage
 245      area, determined by the specified THREAD, OFFSET, and LOAD_MODULE.
 246      Stores it in *ADDRESS and returns zero on success; otherwise returns
 247      an error code.  A return value of -1 means this system does not
 248      support the operation.  */
 249
 250   int (*get_tls_address) (struct thread_info *thread, CORE_ADDR offset,
 251                           CORE_ADDR load_module, CORE_ADDR *address);
 252
 253    /* Read/Write from/to spufs using qXfer packets.  */
 254   int (*qxfer_spu) (const char *annex, unsigned char *readbuf,
 255                     unsigned const char *writebuf, CORE_ADDR offset, int len);
 256
 257   /* Fill BUF with an hostio error packet representing the last hostio
 258      error.  */
 259   void (*hostio_last_error) (char *buf);
 260
 261   /* Read/Write OS data using qXfer packets.  */
 262   int (*qxfer_osdata) (const char *annex, unsigned char *readbuf,
 263                        unsigned const char *writebuf, CORE_ADDR offset,
 264                        int len);
 265
 266   /* Read/Write extra signal info.  */
 267   int (*qxfer_siginfo) (const char *annex, unsigned char *readbuf,
 268                         unsigned const char *writebuf,
 269                         CORE_ADDR offset, int len);
 270
 271   int (*supports_non_stop) (void);
 272
 273   /* Enables async target events.  Returns the previous enable
 274      state.  */
 275   int (*async) (int enable);
 276
 277   /* Switch to non-stop (1) or all-stop (0) mode.  Return 0 on
 278      success, -1 otherwise.  */
 279   int (*start_non_stop) (int);
 280
 281   /* Returns true if the target supports multi-process debugging.  */
 282   int (*supports_multi_process) (void);
 283
 284   /* Returns true if fork events are supported.  */
 285   int (*supports_fork_events) (void);
 286
 287   /* Returns true if vfork events are supported.  */
 288   int (*supports_vfork_events) (void);
 289
 290   /* Allows target to re-initialize connection-specific settings.  */
 291   void (*handle_new_gdb_connection) (void);
 292
 293   /* If not NULL, target-specific routine to process monitor command.
 294      Returns 1 if handled, or 0 to perform default processing.  */
 295   int (*handle_monitor_command) (char *);
 296
 297   /* Returns the core given a thread, or -1 if not known.  */
 298   int (*core_of_thread) (ptid_t);
 299
 300   /* Read loadmaps.  Read LEN bytes at OFFSET into a buffer at MYADDR.  */
 301   int (*read_loadmap) (const char *annex, CORE_ADDR offset,
 302                        unsigned char *myaddr, unsigned int len);
 303
 304   /* Target specific qSupported support.  */
 305   void (*process_qsupported) (const char *);
 306
 307   /* Return 1 if the target supports tracepoints, 0 (or leave the
 308      callback NULL) otherwise.  */
 309   int (*supports_tracepoints) (void);
 310
 311   /* Read PC from REGCACHE.  */
 312   CORE_ADDR (*read_pc) (struct regcache *regcache);
 313
 314   /* Write PC to REGCACHE.  */
 315   void (*write_pc) (struct regcache *regcache, CORE_ADDR pc);
 316
 317   /* Return true if THREAD is known to be stopped now.  */
 318   int (*thread_stopped) (struct thread_info *thread);
 319
 320   /* Read Thread Information Block address.  */
 321   int (*get_tib_address) (ptid_t ptid, CORE_ADDR *address);
 322
 323   /* Pause all threads.  If FREEZE, arrange for any resume attempt to
 324      be ignored until an unpause_all call unfreezes threads again.
 325      There can be nested calls to pause_all, so a freeze counter
 326      should be maintained.  */
 327   void (*pause_all) (int freeze);
 328
 329   /* Unpause all threads.  Threads that hadn't been resumed by the
 330      client should be left stopped.  Basically a pause/unpause call
 331      pair should not end up resuming threads that were stopped before
 332      the pause call.  */
 333   void (*unpause_all) (int unfreeze);
 334
 335   /* Stabilize all threads.  That is, force them out of jump pads.  */
 336   void (*stabilize_threads) (void);
 337
 338   /* Install a fast tracepoint jump pad.  TPOINT is the address of the
 339      tracepoint internal object as used by the IPA agent.  TPADDR is
 340      the address of tracepoint.  COLLECTOR is address of the function
 341      the jump pad redirects to.  LOCKADDR is the address of the jump
 342      pad lock object.  ORIG_SIZE is the size in bytes of the
 343      instruction at TPADDR.  JUMP_ENTRY points to the address of the
 344      jump pad entry, and on return holds the address past the end of
 345      the created jump pad.  If a trampoline is created by the function,
 346      then TRAMPOLINE and TRAMPOLINE_SIZE return the address and size of
 347      the trampoline, else they remain unchanged.  JJUMP_PAD_INSN is a
 348      buffer containing a copy of the instruction at TPADDR.
 349      ADJUST_INSN_ADDR and ADJUST_INSN_ADDR_END are output parameters that
 350      return the address range where the instruction at TPADDR was relocated
 351      to.  If an error occurs, the ERR may be used to pass on an error
 352      message.  */
 353   int (*install_fast_tracepoint_jump_pad) (CORE_ADDR tpoint, CORE_ADDR tpaddr,
 354                                            CORE_ADDR collector,
 355                                            CORE_ADDR lockaddr,
 356                                            ULONGEST orig_size,
 357                                            CORE_ADDR *jump_entry,
 358                                            CORE_ADDR *trampoline,
 359                                            ULONGEST *trampoline_size,
 360                                            unsigned char *jjump_pad_insn,
 361                                            ULONGEST *jjump_pad_insn_size,
 362                                            CORE_ADDR *adjusted_insn_addr,
 363                                            CORE_ADDR *adjusted_insn_addr_end,
 364                                            char *err);
 365
 366   /* Return the bytecode operations vector for the current inferior.
 367      Returns NULL if bytecode compilation is not supported.  */
 368   struct emit_ops *(*emit_ops) (void);
 369
 370   /* Returns true if the target supports disabling randomization.  */
 371   int (*supports_disable_randomization) (void);
 372
 373   /* Return the minimum length of an instruction that can be safely overwritten
 374      for use as a fast tracepoint.  */
 375   int (*get_min_fast_tracepoint_insn_len) (void);
 376
 377   /* Read solib info on SVR4 platforms.  */
 378   int (*qxfer_libraries_svr4) (const char *annex, unsigned char *readbuf,
 379                                unsigned const char *writebuf,
 380                                CORE_ADDR offset, int len);
 381
 382   /* Return true if target supports debugging agent.  */
 383   int (*supports_agent) (void);
 384
 385   /* Check whether the target supports branch tracing.  */
 386   int (*supports_btrace) (struct target_ops *, enum btrace_format);
 387
 388   /* Enable branch tracing for PTID based on CONF and allocate a branch trace
 389      target information struct for reading and for disabling branch trace.  */
 390   struct btrace_target_info *(*enable_btrace)
 391     (ptid_t ptid, const struct btrace_config *conf);
 392
 393   /* Disable branch tracing.
 394      Returns zero on success, non-zero otherwise.  */
 395   int (*disable_btrace) (struct btrace_target_info *tinfo);
 396
 397   /* Read branch trace data into buffer.  We use an int to specify the type
 398      to break a cyclic dependency.
 399      Return 0 on success; print an error message into BUFFER and return -1,
 400      otherwise.  */
 401   int (*read_btrace) (struct btrace_target_info *, struct buffer *, int type);
 402
 403   /* Read the branch trace configuration into BUFFER.
 404      Return 0 on success; print an error message into BUFFER and return -1
 405      otherwise.  */
 406   int (*read_btrace_conf) (const struct btrace_target_info *, struct buffer *);
 407
 408   /* Return true if target supports range stepping.  */
 409   int (*supports_range_stepping) (void);
 410
 411   /* Return the full absolute name of the executable file that was
 412      run to create the process PID.  If the executable file cannot
 413      be determined, NULL is returned.  Otherwise, a pointer to a
 414      character string containing the pathname is returned.  This
 415      string should be copied into a buffer by the client if the string
 416      will not be immediately used, or if it must persist.  */
 417   char *(*pid_to_exec_file) (int pid);
 418
 419   /* Multiple-filesystem-aware open.  Like open(2), but operating in
 420      the filesystem as it appears to process PID.  Systems where all
 421      processes share a common filesystem should set this to NULL.
 422      If NULL, the caller should fall back to open(2).  */
 423   int (*multifs_open) (int pid, const char *filename,
 424                        int flags, mode_t mode);
 425
 426   /* Multiple-filesystem-aware unlink.  Like unlink(2), but operates
 427      in the filesystem as it appears to process PID.  Systems where
 428      all processes share a common filesystem should set this to NULL.
 429      If NULL, the caller should fall back to unlink(2).  */
 430   int (*multifs_unlink) (int pid, const char *filename);
 431
 432   /* Multiple-filesystem-aware readlink.  Like readlink(2), but
 433      operating in the filesystem as it appears to process PID.
 434      Systems where all processes share a common filesystem should
 435      set this to NULL.  If NULL, the caller should fall back to
 436      readlink(2).  */
 437   ssize_t (*multifs_readlink) (int pid, const char *filename,
 438                                char *buf, size_t bufsiz);
 439 };
 440
 441 extern struct target_ops *the_target;
 442
 443 void set_target_ops (struct target_ops *);
 444
 445 #define create_inferior(program, args) \
 446   (*the_target->create_inferior) (program, args)
 447
 448 #define myattach(pid) \
 449   (*the_target->attach) (pid)
 450
 451 int kill_inferior (int);
 452
 453 #define target_supports_fork_events() \
 454   (the_target->supports_fork_events ? \
 455    (*the_target->supports_fork_events) () : 0)
 456
 457 #define target_supports_vfork_events() \
 458   (the_target->supports_vfork_events ? \
 459    (*the_target->supports_vfork_events) () : 0)
 460
 461 #define target_handle_new_gdb_connection()               \
 462   do                                                     \
 463     {                                                    \
 464       if (the_target->handle_new_gdb_connection != NULL) \
 465         (*the_target->handle_new_gdb_connection) ();     \
 466     } while (0)
 467
 468 #define detach_inferior(pid) \
 469   (*the_target->detach) (pid)
 470
 471 #define mourn_inferior(PROC) \
 472   (*the_target->mourn) (PROC)
 473
 474 #define mythread_alive(pid) \
 475   (*the_target->thread_alive) (pid)
 476
 477 #define fetch_inferior_registers(regcache, regno)       \
 478   (*the_target->fetch_registers) (regcache, regno)
 479
 480 #define store_inferior_registers(regcache, regno) \
 481   (*the_target->store_registers) (regcache, regno)
 482
 483 #define join_inferior(pid) \
 484   (*the_target->join) (pid)
 485
 486 #define target_supports_non_stop() \
 487   (the_target->supports_non_stop ? (*the_target->supports_non_stop ) () : 0)
 488
 489 #define target_async(enable) \
 490   (the_target->async ? (*the_target->async) (enable) : 0)
 491
 492 #define target_supports_multi_process() \
 493   (the_target->supports_multi_process ? \
 494    (*the_target->supports_multi_process) () : 0)
 495
 496 #define target_process_qsupported(query)                \
 497   do                                                    \
 498     {                                                   \
 499       if (the_target->process_qsupported)               \
 500         the_target->process_qsupported (query);         \
 501     } while (0)
 502
 503 #define target_supports_tracepoints()                   \
 504   (the_target->supports_tracepoints                     \
 505    ? (*the_target->supports_tracepoints) () : 0)
 506
 507 #define target_supports_fast_tracepoints()              \
 508   (the_target->install_fast_tracepoint_jump_pad != NULL)
 509
 510 #define target_get_min_fast_tracepoint_insn_len()       \
 511   (the_target->get_min_fast_tracepoint_insn_len         \
 512    ? (*the_target->get_min_fast_tracepoint_insn_len) () : 0)
 513
 514 #define thread_stopped(thread) \
 515   (*the_target->thread_stopped) (thread)
 516
 517 #define pause_all(freeze)                       \
 518   do                                            \
 519     {                                           \
 520       if (the_target->pause_all)                \
 521         (*the_target->pause_all) (freeze);      \
 522     } while (0)
 523
 524 #define unpause_all(unfreeze)                   \
 525   do                                            \
 526     {                                           \
 527       if (the_target->unpause_all)              \
 528         (*the_target->unpause_all) (unfreeze);  \
 529     } while (0)
 530
 531 #define stabilize_threads()                     \
 532   do                                            \
 533     {                                           \
 534       if (the_target->stabilize_threads)        \
 535         (*the_target->stabilize_threads) ();    \
 536     } while (0)
 537
 538 #define install_fast_tracepoint_jump_pad(tpoint, tpaddr,                \
 539                                          collector, lockaddr,           \
 540                                          orig_size,                     \
 541                                          jump_entry,                    \
 542                                          trampoline, trampoline_size,   \
 543                                          jjump_pad_insn,                \
 544                                          jjump_pad_insn_size,           \
 545                                          adjusted_insn_addr,            \
 546                                          adjusted_insn_addr_end,        \
 547                                          err)                           \
 548   (*the_target->install_fast_tracepoint_jump_pad) (tpoint, tpaddr,      \
 549                                                    collector,lockaddr,  \
 550                                                    orig_size, jump_entry, \
 551                                                    trampoline,          \
 552                                                    trampoline_size,     \
 553                                                    jjump_pad_insn,      \
 554                                                    jjump_pad_insn_size, \
 555                                                    adjusted_insn_addr,  \
 556                                                    adjusted_insn_addr_end, \
 557                                                    err)
 558
 559 #define target_emit_ops() \
 560   (the_target->emit_ops ? (*the_target->emit_ops) () : NULL)
 561
 562 #define target_supports_disable_randomization() \
 563   (the_target->supports_disable_randomization ? \
 564    (*the_target->supports_disable_randomization) () : 0)
 565
 566 #define target_supports_agent() \
 567   (the_target->supports_agent ? \
 568    (*the_target->supports_agent) () : 0)
 569
 570 #define target_supports_btrace(format)                  \
 571   (the_target->supports_btrace                          \
 572    ? (*the_target->supports_btrace) (the_target, format) : 0)
 573
 574 #define target_enable_btrace(ptid, conf) \
 575   (*the_target->enable_btrace) (ptid, conf)
 576
 577 #define target_disable_btrace(tinfo) \
 578   (*the_target->disable_btrace) (tinfo)
 579
 580 #define target_read_btrace(tinfo, buffer, type) \
 581   (*the_target->read_btrace) (tinfo, buffer, type)
 582
 583 #define target_read_btrace_conf(tinfo, buffer)  \
 584   (*the_target->read_btrace_conf) (tinfo, buffer)
 585
 586 #define target_supports_range_stepping() \
 587   (the_target->supports_range_stepping ? \
 588    (*the_target->supports_range_stepping) () : 0)
 589
 590 #define target_supports_stopped_by_sw_breakpoint() \
 591   (the_target->supports_stopped_by_sw_breakpoint ? \
 592    (*the_target->supports_stopped_by_sw_breakpoint) () : 0)
 593
 594 #define target_stopped_by_sw_breakpoint() \
 595   (the_target->stopped_by_sw_breakpoint ? \
 596    (*the_target->stopped_by_sw_breakpoint) () : 0)
 597
 598 #define target_supports_stopped_by_hw_breakpoint() \
 599   (the_target->supports_stopped_by_hw_breakpoint ? \
 600    (*the_target->supports_stopped_by_hw_breakpoint) () : 0)
 601
 602 #define target_supports_conditional_breakpoints() \
 603   (the_target->supports_conditional_breakpoints ? \
 604    (*the_target->supports_conditional_breakpoints) () : 0)
 605
 606 #define target_stopped_by_hw_breakpoint() \
 607   (the_target->stopped_by_hw_breakpoint ? \
 608    (*the_target->stopped_by_hw_breakpoint) () : 0)
 609
 610 /* Start non-stop mode, returns 0 on success, -1 on failure.   */
 611
 612 int start_non_stop (int nonstop);
 613
 614 ptid_t mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
 615                int connected_wait);
 616
 617 #define prepare_to_access_memory()              \
 618   (the_target->prepare_to_access_memory         \
 619    ? (*the_target->prepare_to_access_memory) () \
 620    : 0)
 621
 622 #define done_accessing_memory()                         \
 623   do                                                    \
 624     {                                                   \
 625       if (the_target->done_accessing_memory)            \
 626         (*the_target->done_accessing_memory) ();        \
 627     } while (0)
 628
 629 #define target_core_of_thread(ptid)             \
 630   (the_target->core_of_thread ? (*the_target->core_of_thread) (ptid) \
 631    : -1)
 632
 633 int read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len);
 634
 635 int write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
 636                            int len);
 637
 638 void set_desired_thread (int id);
 639
 640 const char *target_pid_to_str (ptid_t);
 641
 642 #endif /* TARGET_H */