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   /* Architecture-specific setup.  */
  78   void (*arch_setup) (void);
  79
  80   /* Attach to a running process.
  81
  82      PID is the process ID to attach to, specified by the user
  83      or a higher layer.
  84
  85      Returns -1 if attaching is unsupported, 0 on success, and calls
  86      error() otherwise.  */
  87
  88   int (*attach) (unsigned long pid);
  89
  90   /* Kill inferior PID.  Return -1 on failure, and 0 on success.  */
  91
  92   int (*kill) (int pid);
  93
  94   /* Detach from inferior PID. Return -1 on failure, and 0 on
  95      success.  */
  96
  97   int (*detach) (int pid);
  98
  99   /* The inferior process has died.  Do what is right.  */
 100
 101   void (*mourn) (struct process_info *proc);
 102
 103   /* Wait for inferior PID to exit.  */
 104   void (*join) (int pid);
 105
 106   /* Return 1 iff the thread with process ID PID is alive.  */
 107
 108   int (*thread_alive) (ptid_t pid);
 109
 110   /* Resume the inferior process.  */
 111
 112   void (*resume) (struct thread_resume *resume_info, size_t n);
 113
 114   /* Wait for the inferior process or thread to change state.  Store
 115      status through argument pointer STATUS.
 116
 117      PTID = -1 to wait for any pid to do something, PTID(pid,0,0) to
 118      wait for any thread of process pid to do something.  Return ptid
 119      of child, or -1 in case of error; store status through argument
 120      pointer STATUS.  OPTIONS is a bit set of options defined as
 121      TARGET_W* above.  If options contains TARGET_WNOHANG and there's
 122      no child stop to report, return is
 123      null_ptid/TARGET_WAITKIND_IGNORE.  */
 124
 125   ptid_t (*wait) (ptid_t ptid, struct target_waitstatus *status, int options);
 126
 127   /* Fetch registers from the inferior process.
 128
 129      If REGNO is -1, fetch all registers; otherwise, fetch at least REGNO.  */
 130
 131   void (*fetch_registers) (struct regcache *regcache, int regno);
 132
 133   /* Store registers to the inferior process.
 134
 135      If REGNO is -1, store all registers; otherwise, store at least REGNO.  */
 136
 137   void (*store_registers) (struct regcache *regcache, int regno);
 138
 139   /* Prepare to read or write memory from the inferior process.
 140      Targets use this to do what is necessary to get the state of the
 141      inferior such that it is possible to access memory.
 142
 143      This should generally only be called from client facing routines,
 144      such as gdb_read_memory/gdb_write_memory, or the GDB breakpoint
 145      insertion routine.
 146
 147      Like `read_memory' and `write_memory' below, returns 0 on success
 148      and errno on failure.  */
 149
 150   int (*prepare_to_access_memory) (void);
 151
 152   /* Undo the effects of prepare_to_access_memory.  */
 153
 154   void (*done_accessing_memory) (void);
 155
 156   /* Read memory from the inferior process.  This should generally be
 157      called through read_inferior_memory, which handles breakpoint shadowing.
 158
 159      Read LEN bytes at MEMADDR into a buffer at MYADDR.
 160
 161      Returns 0 on success and errno on failure.  */
 162
 163   int (*read_memory) (CORE_ADDR memaddr, unsigned char *myaddr, int len);
 164
 165   /* Write memory to the inferior process.  This should generally be
 166      called through write_inferior_memory, which handles breakpoint shadowing.
 167
 168      Write LEN bytes from the buffer at MYADDR to MEMADDR.
 169
 170      Returns 0 on success and errno on failure.  */
 171
 172   int (*write_memory) (CORE_ADDR memaddr, const unsigned char *myaddr,
 173                        int len);
 174
 175   /* Query GDB for the values of any symbols we're interested in.
 176      This function is called whenever we receive a "qSymbols::"
 177      query, which corresponds to every time more symbols (might)
 178      become available.  NULL if we aren't interested in any
 179      symbols.  */
 180
 181   void (*look_up_symbols) (void);
 182
 183   /* Send an interrupt request to the inferior process,
 184      however is appropriate.  */
 185
 186   void (*request_interrupt) (void);
 187
 188   /* Read auxiliary vector data from the inferior process.
 189
 190      Read LEN bytes at OFFSET into a buffer at MYADDR.  */
 191
 192   int (*read_auxv) (CORE_ADDR offset, unsigned char *myaddr,
 193                     unsigned int len);
 194
 195   /* Returns true if GDB Z breakpoint type TYPE is supported, false
 196      otherwise.  The type is coded as follows:
 197        '0' - software-breakpoint
 198        '1' - hardware-breakpoint
 199        '2' - write watchpoint
 200        '3' - read watchpoint
 201        '4' - access watchpoint
 202   */
 203   int (*supports_z_point_type) (char z_type);
 204
 205   /* Insert and remove a break or watchpoint.
 206      Returns 0 on success, -1 on failure and 1 on unsupported.  */
 207
 208   int (*insert_point) (enum raw_bkpt_type type, CORE_ADDR addr,
 209                        int size, struct raw_breakpoint *bp);
 210   int (*remove_point) (enum raw_bkpt_type type, CORE_ADDR addr,
 211                        int size, struct raw_breakpoint *bp);
 212
 213   /* Returns 1 if the target stopped because it executed a software
 214      breakpoint instruction, 0 otherwise.  */
 215   int (*stopped_by_sw_breakpoint) (void);
 216
 217   /* Returns true if the target knows whether a trap was caused by a
 218      SW breakpoint triggering.  */
 219   int (*supports_stopped_by_sw_breakpoint) (void);
 220
 221   /* Returns 1 if the target stopped for a hardware breakpoint.  */
 222   int (*stopped_by_hw_breakpoint) (void);
 223
 224   /* Returns true if the target knows whether a trap was caused by a
 225      HW breakpoint triggering.  */
 226   int (*supports_stopped_by_hw_breakpoint) (void);
 227
 228   /* Returns true if the target can evaluate conditions of
 229      breakpoints.  */
 230   int (*supports_conditional_breakpoints) (void);
 231
 232   /* Returns 1 if target was stopped due to a watchpoint hit, 0 otherwise.  */
 233
 234   int (*stopped_by_watchpoint) (void);
 235
 236   /* Returns the address associated with the watchpoint that hit, if any;
 237      returns 0 otherwise.  */
 238
 239   CORE_ADDR (*stopped_data_address) (void);
 240
 241   /* Reports the text, data offsets of the executable.  This is
 242      needed for uclinux where the executable is relocated during load
 243      time.  */
 244
 245   int (*read_offsets) (CORE_ADDR *text, CORE_ADDR *data);
 246
 247   /* Fetch the address associated with a specific thread local storage
 248      area, determined by the specified THREAD, OFFSET, and LOAD_MODULE.
 249      Stores it in *ADDRESS and returns zero on success; otherwise returns
 250      an error code.  A return value of -1 means this system does not
 251      support the operation.  */
 252
 253   int (*get_tls_address) (struct thread_info *thread, CORE_ADDR offset,
 254                           CORE_ADDR load_module, CORE_ADDR *address);
 255
 256    /* Read/Write from/to spufs using qXfer packets.  */
 257   int (*qxfer_spu) (const char *annex, unsigned char *readbuf,
 258                     unsigned const char *writebuf, CORE_ADDR offset, int len);
 259
 260   /* Fill BUF with an hostio error packet representing the last hostio
 261      error.  */
 262   void (*hostio_last_error) (char *buf);
 263
 264   /* Read/Write OS data using qXfer packets.  */
 265   int (*qxfer_osdata) (const char *annex, unsigned char *readbuf,
 266                        unsigned const char *writebuf, CORE_ADDR offset,
 267                        int len);
 268
 269   /* Read/Write extra signal info.  */
 270   int (*qxfer_siginfo) (const char *annex, unsigned char *readbuf,
 271                         unsigned const char *writebuf,
 272                         CORE_ADDR offset, int len);
 273
 274   int (*supports_non_stop) (void);
 275
 276   /* Enables async target events.  Returns the previous enable
 277      state.  */
 278   int (*async) (int enable);
 279
 280   /* Switch to non-stop (1) or all-stop (0) mode.  Return 0 on
 281      success, -1 otherwise.  */
 282   int (*start_non_stop) (int);
 283
 284   /* Returns true if the target supports multi-process debugging.  */
 285   int (*supports_multi_process) (void);
 286
 287   /* Returns true if fork events are supported.  */
 288   int (*supports_fork_events) (void);
 289
 290   /* Returns true if vfork events are supported.  */
 291   int (*supports_vfork_events) (void);
 292
 293   /* Allows target to re-initialize connection-specific settings.  */
 294   void (*handle_new_gdb_connection) (void);
 295
 296   /* If not NULL, target-specific routine to process monitor command.
 297      Returns 1 if handled, or 0 to perform default processing.  */
 298   int (*handle_monitor_command) (char *);
 299
 300   /* Returns the core given a thread, or -1 if not known.  */
 301   int (*core_of_thread) (ptid_t);
 302
 303   /* Read loadmaps.  Read LEN bytes at OFFSET into a buffer at MYADDR.  */
 304   int (*read_loadmap) (const char *annex, CORE_ADDR offset,
 305                        unsigned char *myaddr, unsigned int len);
 306
 307   /* Target specific qSupported support.  */
 308   void (*process_qsupported) (const char *);
 309
 310   /* Return 1 if the target supports tracepoints, 0 (or leave the
 311      callback NULL) otherwise.  */
 312   int (*supports_tracepoints) (void);
 313
 314   /* Read PC from REGCACHE.  */
 315   CORE_ADDR (*read_pc) (struct regcache *regcache);
 316
 317   /* Write PC to REGCACHE.  */
 318   void (*write_pc) (struct regcache *regcache, CORE_ADDR pc);
 319
 320   /* Return true if THREAD is known to be stopped now.  */
 321   int (*thread_stopped) (struct thread_info *thread);
 322
 323   /* Read Thread Information Block address.  */
 324   int (*get_tib_address) (ptid_t ptid, CORE_ADDR *address);
 325
 326   /* Pause all threads.  If FREEZE, arrange for any resume attempt to
 327      be ignored until an unpause_all call unfreezes threads again.
 328      There can be nested calls to pause_all, so a freeze counter
 329      should be maintained.  */
 330   void (*pause_all) (int freeze);
 331
 332   /* Unpause all threads.  Threads that hadn't been resumed by the
 333      client should be left stopped.  Basically a pause/unpause call
 334      pair should not end up resuming threads that were stopped before
 335      the pause call.  */
 336   void (*unpause_all) (int unfreeze);
 337
 338   /* Stabilize all threads.  That is, force them out of jump pads.  */
 339   void (*stabilize_threads) (void);
 340
 341   /* Install a fast tracepoint jump pad.  TPOINT is the address of the
 342      tracepoint internal object as used by the IPA agent.  TPADDR is
 343      the address of tracepoint.  COLLECTOR is address of the function
 344      the jump pad redirects to.  LOCKADDR is the address of the jump
 345      pad lock object.  ORIG_SIZE is the size in bytes of the
 346      instruction at TPADDR.  JUMP_ENTRY points to the address of the
 347      jump pad entry, and on return holds the address past the end of
 348      the created jump pad.  If a trampoline is created by the function,
 349      then TRAMPOLINE and TRAMPOLINE_SIZE return the address and size of
 350      the trampoline, else they remain unchanged.  JJUMP_PAD_INSN is a
 351      buffer containing a copy of the instruction at TPADDR.
 352      ADJUST_INSN_ADDR and ADJUST_INSN_ADDR_END are output parameters that
 353      return the address range where the instruction at TPADDR was relocated
 354      to.  If an error occurs, the ERR may be used to pass on an error
 355      message.  */
 356   int (*install_fast_tracepoint_jump_pad) (CORE_ADDR tpoint, CORE_ADDR tpaddr,
 357                                            CORE_ADDR collector,
 358                                            CORE_ADDR lockaddr,
 359                                            ULONGEST orig_size,
 360                                            CORE_ADDR *jump_entry,
 361                                            CORE_ADDR *trampoline,
 362                                            ULONGEST *trampoline_size,
 363                                            unsigned char *jjump_pad_insn,
 364                                            ULONGEST *jjump_pad_insn_size,
 365                                            CORE_ADDR *adjusted_insn_addr,
 366                                            CORE_ADDR *adjusted_insn_addr_end,
 367                                            char *err);
 368
 369   /* Return the bytecode operations vector for the current inferior.
 370      Returns NULL if bytecode compilation is not supported.  */
 371   struct emit_ops *(*emit_ops) (void);
 372
 373   /* Returns true if the target supports disabling randomization.  */
 374   int (*supports_disable_randomization) (void);
 375
 376   /* Return the minimum length of an instruction that can be safely overwritten
 377      for use as a fast tracepoint.  */
 378   int (*get_min_fast_tracepoint_insn_len) (void);
 379
 380   /* Read solib info on SVR4 platforms.  */
 381   int (*qxfer_libraries_svr4) (const char *annex, unsigned char *readbuf,
 382                                unsigned const char *writebuf,
 383                                CORE_ADDR offset, int len);
 384
 385   /* Return true if target supports debugging agent.  */
 386   int (*supports_agent) (void);
 387
 388   /* Check whether the target supports branch tracing.  */
 389   int (*supports_btrace) (struct target_ops *, enum btrace_format);
 390
 391   /* Enable branch tracing for PTID based on CONF and allocate a branch trace
 392      target information struct for reading and for disabling branch trace.  */
 393   struct btrace_target_info *(*enable_btrace)
 394     (ptid_t ptid, const struct btrace_config *conf);
 395
 396   /* Disable branch tracing.
 397      Returns zero on success, non-zero otherwise.  */
 398   int (*disable_btrace) (struct btrace_target_info *tinfo);
 399
 400   /* Read branch trace data into buffer.  We use an int to specify the type
 401      to break a cyclic dependency.
 402      Return 0 on success; print an error message into BUFFER and return -1,
 403      otherwise.  */
 404   int (*read_btrace) (struct btrace_target_info *, struct buffer *, int type);
 405
 406   /* Read the branch trace configuration into BUFFER.
 407      Return 0 on success; print an error message into BUFFER and return -1
 408      otherwise.  */
 409   int (*read_btrace_conf) (const struct btrace_target_info *, struct buffer *);
 410
 411   /* Return true if target supports range stepping.  */
 412   int (*supports_range_stepping) (void);
 413
 414   /* Return the full absolute name of the executable file that was
 415      run to create the process PID.  If the executable file cannot
 416      be determined, NULL is returned.  Otherwise, a pointer to a
 417      character string containing the pathname is returned.  This
 418      string should be copied into a buffer by the client if the string
 419      will not be immediately used, or if it must persist.  */
 420   char *(*pid_to_exec_file) (int pid);
 421
 422   /* Multiple-filesystem-aware open.  Like open(2), but operating in
 423      the filesystem as it appears to process PID.  Systems where all
 424      processes share a common filesystem should set this to NULL.
 425      If NULL, the caller should fall back to open(2).  */
 426   int (*multifs_open) (int pid, const char *filename,
 427                        int flags, mode_t mode);
 428
 429   /* Multiple-filesystem-aware unlink.  Like unlink(2), but operates
 430      in the filesystem as it appears to process PID.  Systems where
 431      all processes share a common filesystem should set this to NULL.
 432      If NULL, the caller should fall back to unlink(2).  */
 433   int (*multifs_unlink) (int pid, const char *filename);
 434
 435   /* Multiple-filesystem-aware readlink.  Like readlink(2), but
 436      operating in the filesystem as it appears to process PID.
 437      Systems where all processes share a common filesystem should
 438      set this to NULL.  If NULL, the caller should fall back to
 439      readlink(2).  */
 440   ssize_t (*multifs_readlink) (int pid, const char *filename,
 441                                char *buf, size_t bufsiz);
 442 };
 443
 444 extern struct target_ops *the_target;
 445
 446 void set_target_ops (struct target_ops *);
 447
 448 #define create_inferior(program, args) \
 449   (*the_target->create_inferior) (program, args)
 450
 451 #define target_arch_setup()                      \
 452   do                                             \
 453     {                                            \
 454       if (the_target->arch_setup != NULL)        \
 455         (*the_target->arch_setup) ();            \
 456     } while (0)
 457
 458 #define myattach(pid) \
 459   (*the_target->attach) (pid)
 460
 461 int kill_inferior (int);
 462
 463 #define target_supports_fork_events() \
 464   (the_target->supports_fork_events ? \
 465    (*the_target->supports_fork_events) () : 0)
 466
 467 #define target_supports_vfork_events() \
 468   (the_target->supports_vfork_events ? \
 469    (*the_target->supports_vfork_events) () : 0)
 470
 471 #define target_handle_new_gdb_connection()               \
 472   do                                                     \
 473     {                                                    \
 474       if (the_target->handle_new_gdb_connection != NULL) \
 475         (*the_target->handle_new_gdb_connection) ();     \
 476     } while (0)
 477
 478 #define detach_inferior(pid) \
 479   (*the_target->detach) (pid)
 480
 481 #define mourn_inferior(PROC) \
 482   (*the_target->mourn) (PROC)
 483
 484 #define mythread_alive(pid) \
 485   (*the_target->thread_alive) (pid)
 486
 487 #define fetch_inferior_registers(regcache, regno)       \
 488   (*the_target->fetch_registers) (regcache, regno)
 489
 490 #define store_inferior_registers(regcache, regno) \
 491   (*the_target->store_registers) (regcache, regno)
 492
 493 #define join_inferior(pid) \
 494   (*the_target->join) (pid)
 495
 496 #define target_supports_non_stop() \
 497   (the_target->supports_non_stop ? (*the_target->supports_non_stop ) () : 0)
 498
 499 #define target_async(enable) \
 500   (the_target->async ? (*the_target->async) (enable) : 0)
 501
 502 #define target_supports_multi_process() \
 503   (the_target->supports_multi_process ? \
 504    (*the_target->supports_multi_process) () : 0)
 505
 506 #define target_process_qsupported(query)                \
 507   do                                                    \
 508     {                                                   \
 509       if (the_target->process_qsupported)               \
 510         the_target->process_qsupported (query);         \
 511     } while (0)
 512
 513 #define target_supports_tracepoints()                   \
 514   (the_target->supports_tracepoints                     \
 515    ? (*the_target->supports_tracepoints) () : 0)
 516
 517 #define target_supports_fast_tracepoints()              \
 518   (the_target->install_fast_tracepoint_jump_pad != NULL)
 519
 520 #define target_get_min_fast_tracepoint_insn_len()       \
 521   (the_target->get_min_fast_tracepoint_insn_len         \
 522    ? (*the_target->get_min_fast_tracepoint_insn_len) () : 0)
 523
 524 #define thread_stopped(thread) \
 525   (*the_target->thread_stopped) (thread)
 526
 527 #define pause_all(freeze)                       \
 528   do                                            \
 529     {                                           \
 530       if (the_target->pause_all)                \
 531         (*the_target->pause_all) (freeze);      \
 532     } while (0)
 533
 534 #define unpause_all(unfreeze)                   \
 535   do                                            \
 536     {                                           \
 537       if (the_target->unpause_all)              \
 538         (*the_target->unpause_all) (unfreeze);  \
 539     } while (0)
 540
 541 #define stabilize_threads()                     \
 542   do                                            \
 543     {                                           \
 544       if (the_target->stabilize_threads)        \
 545         (*the_target->stabilize_threads) ();    \
 546     } while (0)
 547
 548 #define install_fast_tracepoint_jump_pad(tpoint, tpaddr,                \
 549                                          collector, lockaddr,           \
 550                                          orig_size,                     \
 551                                          jump_entry,                    \
 552                                          trampoline, trampoline_size,   \
 553                                          jjump_pad_insn,                \
 554                                          jjump_pad_insn_size,           \
 555                                          adjusted_insn_addr,            \
 556                                          adjusted_insn_addr_end,        \
 557                                          err)                           \
 558   (*the_target->install_fast_tracepoint_jump_pad) (tpoint, tpaddr,      \
 559                                                    collector,lockaddr,  \
 560                                                    orig_size, jump_entry, \
 561                                                    trampoline,          \
 562                                                    trampoline_size,     \
 563                                                    jjump_pad_insn,      \
 564                                                    jjump_pad_insn_size, \
 565                                                    adjusted_insn_addr,  \
 566                                                    adjusted_insn_addr_end, \
 567                                                    err)
 568
 569 #define target_emit_ops() \
 570   (the_target->emit_ops ? (*the_target->emit_ops) () : NULL)
 571
 572 #define target_supports_disable_randomization() \
 573   (the_target->supports_disable_randomization ? \
 574    (*the_target->supports_disable_randomization) () : 0)
 575
 576 #define target_supports_agent() \
 577   (the_target->supports_agent ? \
 578    (*the_target->supports_agent) () : 0)
 579
 580 #define target_supports_btrace(format)                  \
 581   (the_target->supports_btrace                          \
 582    ? (*the_target->supports_btrace) (the_target, format) : 0)
 583
 584 #define target_enable_btrace(ptid, conf) \
 585   (*the_target->enable_btrace) (ptid, conf)
 586
 587 #define target_disable_btrace(tinfo) \
 588   (*the_target->disable_btrace) (tinfo)
 589
 590 #define target_read_btrace(tinfo, buffer, type) \
 591   (*the_target->read_btrace) (tinfo, buffer, type)
 592
 593 #define target_read_btrace_conf(tinfo, buffer)  \
 594   (*the_target->read_btrace_conf) (tinfo, buffer)
 595
 596 #define target_supports_range_stepping() \
 597   (the_target->supports_range_stepping ? \
 598    (*the_target->supports_range_stepping) () : 0)
 599
 600 #define target_supports_stopped_by_sw_breakpoint() \
 601   (the_target->supports_stopped_by_sw_breakpoint ? \
 602    (*the_target->supports_stopped_by_sw_breakpoint) () : 0)
 603
 604 #define target_stopped_by_sw_breakpoint() \
 605   (the_target->stopped_by_sw_breakpoint ? \
 606    (*the_target->stopped_by_sw_breakpoint) () : 0)
 607
 608 #define target_supports_stopped_by_hw_breakpoint() \
 609   (the_target->supports_stopped_by_hw_breakpoint ? \
 610    (*the_target->supports_stopped_by_hw_breakpoint) () : 0)
 611
 612 #define target_supports_conditional_breakpoints() \
 613   (the_target->supports_conditional_breakpoints ? \
 614    (*the_target->supports_conditional_breakpoints) () : 0)
 615
 616 #define target_stopped_by_hw_breakpoint() \
 617   (the_target->stopped_by_hw_breakpoint ? \
 618    (*the_target->stopped_by_hw_breakpoint) () : 0)
 619
 620 /* Start non-stop mode, returns 0 on success, -1 on failure.   */
 621
 622 int start_non_stop (int nonstop);
 623
 624 ptid_t mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
 625                int connected_wait);
 626
 627 #define prepare_to_access_memory()              \
 628   (the_target->prepare_to_access_memory         \
 629    ? (*the_target->prepare_to_access_memory) () \
 630    : 0)
 631
 632 #define done_accessing_memory()                         \
 633   do                                                    \
 634     {                                                   \
 635       if (the_target->done_accessing_memory)            \
 636         (*the_target->done_accessing_memory) ();        \
 637     } while (0)
 638
 639 #define target_core_of_thread(ptid)             \
 640   (the_target->core_of_thread ? (*the_target->core_of_thread) (ptid) \
 641    : -1)
 642
 643 int read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len);
 644
 645 int write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
 646                            int len);
 647
 648 void set_desired_thread (int id);
 649
 650 const char *target_pid_to_str (ptid_t);
 651
 652 #endif /* TARGET_H */