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 do hardware single step.  */
 229   int (*supports_hardware_single_step) (void);
 230
 231   /* Returns 1 if target was stopped due to a watchpoint hit, 0 otherwise.  */
 232
 233   int (*stopped_by_watchpoint) (void);
 234
 235   /* Returns the address associated with the watchpoint that hit, if any;
 236      returns 0 otherwise.  */
 237
 238   CORE_ADDR (*stopped_data_address) (void);
 239
 240   /* Reports the text, data offsets of the executable.  This is
 241      needed for uclinux where the executable is relocated during load
 242      time.  */
 243
 244   int (*read_offsets) (CORE_ADDR *text, CORE_ADDR *data);
 245
 246   /* Fetch the address associated with a specific thread local storage
 247      area, determined by the specified THREAD, OFFSET, and LOAD_MODULE.
 248      Stores it in *ADDRESS and returns zero on success; otherwise returns
 249      an error code.  A return value of -1 means this system does not
 250      support the operation.  */
 251
 252   int (*get_tls_address) (struct thread_info *thread, CORE_ADDR offset,
 253                           CORE_ADDR load_module, CORE_ADDR *address);
 254
 255    /* Read/Write from/to spufs using qXfer packets.  */
 256   int (*qxfer_spu) (const char *annex, unsigned char *readbuf,
 257                     unsigned const char *writebuf, CORE_ADDR offset, int len);
 258
 259   /* Fill BUF with an hostio error packet representing the last hostio
 260      error.  */
 261   void (*hostio_last_error) (char *buf);
 262
 263   /* Read/Write OS data using qXfer packets.  */
 264   int (*qxfer_osdata) (const char *annex, unsigned char *readbuf,
 265                        unsigned const char *writebuf, CORE_ADDR offset,
 266                        int len);
 267
 268   /* Read/Write extra signal info.  */
 269   int (*qxfer_siginfo) (const char *annex, unsigned char *readbuf,
 270                         unsigned const char *writebuf,
 271                         CORE_ADDR offset, int len);
 272
 273   int (*supports_non_stop) (void);
 274
 275   /* Enables async target events.  Returns the previous enable
 276      state.  */
 277   int (*async) (int enable);
 278
 279   /* Switch to non-stop (1) or all-stop (0) mode.  Return 0 on
 280      success, -1 otherwise.  */
 281   int (*start_non_stop) (int);
 282
 283   /* Returns true if the target supports multi-process debugging.  */
 284   int (*supports_multi_process) (void);
 285
 286   /* Returns true if fork events are supported.  */
 287   int (*supports_fork_events) (void);
 288
 289   /* Returns true if vfork events are supported.  */
 290   int (*supports_vfork_events) (void);
 291
 292   /* Returns true if exec events are supported.  */
 293   int (*supports_exec_events) (void);
 294
 295   /* Allows target to re-initialize connection-specific settings.  */
 296   void (*handle_new_gdb_connection) (void);
 297
 298   /* If not NULL, target-specific routine to process monitor command.
 299      Returns 1 if handled, or 0 to perform default processing.  */
 300   int (*handle_monitor_command) (char *);
 301
 302   /* Returns the core given a thread, or -1 if not known.  */
 303   int (*core_of_thread) (ptid_t);
 304
 305   /* Read loadmaps.  Read LEN bytes at OFFSET into a buffer at MYADDR.  */
 306   int (*read_loadmap) (const char *annex, CORE_ADDR offset,
 307                        unsigned char *myaddr, unsigned int len);
 308
 309   /* Target specific qSupported support.  */
 310   void (*process_qsupported) (const char *);
 311
 312   /* Return 1 if the target supports tracepoints, 0 (or leave the
 313      callback NULL) otherwise.  */
 314   int (*supports_tracepoints) (void);
 315
 316   /* Read PC from REGCACHE.  */
 317   CORE_ADDR (*read_pc) (struct regcache *regcache);
 318
 319   /* Write PC to REGCACHE.  */
 320   void (*write_pc) (struct regcache *regcache, CORE_ADDR pc);
 321
 322   /* Return true if THREAD is known to be stopped now.  */
 323   int (*thread_stopped) (struct thread_info *thread);
 324
 325   /* Read Thread Information Block address.  */
 326   int (*get_tib_address) (ptid_t ptid, CORE_ADDR *address);
 327
 328   /* Pause all threads.  If FREEZE, arrange for any resume attempt to
 329      be ignored until an unpause_all call unfreezes threads again.
 330      There can be nested calls to pause_all, so a freeze counter
 331      should be maintained.  */
 332   void (*pause_all) (int freeze);
 333
 334   /* Unpause all threads.  Threads that hadn't been resumed by the
 335      client should be left stopped.  Basically a pause/unpause call
 336      pair should not end up resuming threads that were stopped before
 337      the pause call.  */
 338   void (*unpause_all) (int unfreeze);
 339
 340   /* Stabilize all threads.  That is, force them out of jump pads.  */
 341   void (*stabilize_threads) (void);
 342
 343   /* Install a fast tracepoint jump pad.  TPOINT is the address of the
 344      tracepoint internal object as used by the IPA agent.  TPADDR is
 345      the address of tracepoint.  COLLECTOR is address of the function
 346      the jump pad redirects to.  LOCKADDR is the address of the jump
 347      pad lock object.  ORIG_SIZE is the size in bytes of the
 348      instruction at TPADDR.  JUMP_ENTRY points to the address of the
 349      jump pad entry, and on return holds the address past the end of
 350      the created jump pad.  If a trampoline is created by the function,
 351      then TRAMPOLINE and TRAMPOLINE_SIZE return the address and size of
 352      the trampoline, else they remain unchanged.  JJUMP_PAD_INSN is a
 353      buffer containing a copy of the instruction at TPADDR.
 354      ADJUST_INSN_ADDR and ADJUST_INSN_ADDR_END are output parameters that
 355      return the address range where the instruction at TPADDR was relocated
 356      to.  If an error occurs, the ERR may be used to pass on an error
 357      message.  */
 358   int (*install_fast_tracepoint_jump_pad) (CORE_ADDR tpoint, CORE_ADDR tpaddr,
 359                                            CORE_ADDR collector,
 360                                            CORE_ADDR lockaddr,
 361                                            ULONGEST orig_size,
 362                                            CORE_ADDR *jump_entry,
 363                                            CORE_ADDR *trampoline,
 364                                            ULONGEST *trampoline_size,
 365                                            unsigned char *jjump_pad_insn,
 366                                            ULONGEST *jjump_pad_insn_size,
 367                                            CORE_ADDR *adjusted_insn_addr,
 368                                            CORE_ADDR *adjusted_insn_addr_end,
 369                                            char *err);
 370
 371   /* Return the bytecode operations vector for the current inferior.
 372      Returns NULL if bytecode compilation is not supported.  */
 373   struct emit_ops *(*emit_ops) (void);
 374
 375   /* Returns true if the target supports disabling randomization.  */
 376   int (*supports_disable_randomization) (void);
 377
 378   /* Return the minimum length of an instruction that can be safely overwritten
 379      for use as a fast tracepoint.  */
 380   int (*get_min_fast_tracepoint_insn_len) (void);
 381
 382   /* Read solib info on SVR4 platforms.  */
 383   int (*qxfer_libraries_svr4) (const char *annex, unsigned char *readbuf,
 384                                unsigned const char *writebuf,
 385                                CORE_ADDR offset, int len);
 386
 387   /* Return true if target supports debugging agent.  */
 388   int (*supports_agent) (void);
 389
 390   /* Check whether the target supports branch tracing.  */
 391   int (*supports_btrace) (struct target_ops *, enum btrace_format);
 392
 393   /* Enable branch tracing for PTID based on CONF and allocate a branch trace
 394      target information struct for reading and for disabling branch trace.  */
 395   struct btrace_target_info *(*enable_btrace)
 396     (ptid_t ptid, const struct btrace_config *conf);
 397
 398   /* Disable branch tracing.
 399      Returns zero on success, non-zero otherwise.  */
 400   int (*disable_btrace) (struct btrace_target_info *tinfo);
 401
 402   /* Read branch trace data into buffer.  We use an int to specify the type
 403      to break a cyclic dependency.
 404      Return 0 on success; print an error message into BUFFER and return -1,
 405      otherwise.  */
 406   int (*read_btrace) (struct btrace_target_info *, struct buffer *, int type);
 407
 408   /* Read the branch trace configuration into BUFFER.
 409      Return 0 on success; print an error message into BUFFER and return -1
 410      otherwise.  */
 411   int (*read_btrace_conf) (const struct btrace_target_info *, struct buffer *);
 412
 413   /* Return true if target supports range stepping.  */
 414   int (*supports_range_stepping) (void);
 415
 416   /* Return the full absolute name of the executable file that was
 417      run to create the process PID.  If the executable file cannot
 418      be determined, NULL is returned.  Otherwise, a pointer to a
 419      character string containing the pathname is returned.  This
 420      string should be copied into a buffer by the client if the string
 421      will not be immediately used, or if it must persist.  */
 422   char *(*pid_to_exec_file) (int pid);
 423
 424   /* Multiple-filesystem-aware open.  Like open(2), but operating in
 425      the filesystem as it appears to process PID.  Systems where all
 426      processes share a common filesystem should set this to NULL.
 427      If NULL, the caller should fall back to open(2).  */
 428   int (*multifs_open) (int pid, const char *filename,
 429                        int flags, mode_t mode);
 430
 431   /* Multiple-filesystem-aware unlink.  Like unlink(2), but operates
 432      in the filesystem as it appears to process PID.  Systems where
 433      all processes share a common filesystem should set this to NULL.
 434      If NULL, the caller should fall back to unlink(2).  */
 435   int (*multifs_unlink) (int pid, const char *filename);
 436
 437   /* Multiple-filesystem-aware readlink.  Like readlink(2), but
 438      operating in the filesystem as it appears to process PID.
 439      Systems where all processes share a common filesystem should
 440      set this to NULL.  If NULL, the caller should fall back to
 441      readlink(2).  */
 442   ssize_t (*multifs_readlink) (int pid, const char *filename,
 443                                char *buf, size_t bufsiz);
 444 };
 445
 446 extern struct target_ops *the_target;
 447
 448 void set_target_ops (struct target_ops *);
 449
 450 #define create_inferior(program, args) \
 451   (*the_target->create_inferior) (program, args)
 452
 453 #define target_arch_setup()                      \
 454   do                                             \
 455     {                                            \
 456       if (the_target->arch_setup != NULL)        \
 457         (*the_target->arch_setup) ();            \
 458     } while (0)
 459
 460 #define myattach(pid) \
 461   (*the_target->attach) (pid)
 462
 463 int kill_inferior (int);
 464
 465 #define target_supports_fork_events() \
 466   (the_target->supports_fork_events ? \
 467    (*the_target->supports_fork_events) () : 0)
 468
 469 #define target_supports_vfork_events() \
 470   (the_target->supports_vfork_events ? \
 471    (*the_target->supports_vfork_events) () : 0)
 472
 473 #define target_supports_exec_events() \
 474   (the_target->supports_exec_events ? \
 475    (*the_target->supports_exec_events) () : 0)
 476
 477 #define target_handle_new_gdb_connection()               \
 478   do                                                     \
 479     {                                                    \
 480       if (the_target->handle_new_gdb_connection != NULL) \
 481         (*the_target->handle_new_gdb_connection) ();     \
 482     } while (0)
 483
 484 #define detach_inferior(pid) \
 485   (*the_target->detach) (pid)
 486
 487 #define mourn_inferior(PROC) \
 488   (*the_target->mourn) (PROC)
 489
 490 #define mythread_alive(pid) \
 491   (*the_target->thread_alive) (pid)
 492
 493 #define fetch_inferior_registers(regcache, regno)       \
 494   (*the_target->fetch_registers) (regcache, regno)
 495
 496 #define store_inferior_registers(regcache, regno) \
 497   (*the_target->store_registers) (regcache, regno)
 498
 499 #define join_inferior(pid) \
 500   (*the_target->join) (pid)
 501
 502 #define target_supports_non_stop() \
 503   (the_target->supports_non_stop ? (*the_target->supports_non_stop ) () : 0)
 504
 505 #define target_async(enable) \
 506   (the_target->async ? (*the_target->async) (enable) : 0)
 507
 508 #define target_supports_multi_process() \
 509   (the_target->supports_multi_process ? \
 510    (*the_target->supports_multi_process) () : 0)
 511
 512 #define target_process_qsupported(query)                \
 513   do                                                    \
 514     {                                                   \
 515       if (the_target->process_qsupported)               \
 516         the_target->process_qsupported (query);         \
 517     } while (0)
 518
 519 #define target_supports_tracepoints()                   \
 520   (the_target->supports_tracepoints                     \
 521    ? (*the_target->supports_tracepoints) () : 0)
 522
 523 #define target_supports_fast_tracepoints()              \
 524   (the_target->install_fast_tracepoint_jump_pad != NULL)
 525
 526 #define target_get_min_fast_tracepoint_insn_len()       \
 527   (the_target->get_min_fast_tracepoint_insn_len         \
 528    ? (*the_target->get_min_fast_tracepoint_insn_len) () : 0)
 529
 530 #define thread_stopped(thread) \
 531   (*the_target->thread_stopped) (thread)
 532
 533 #define pause_all(freeze)                       \
 534   do                                            \
 535     {                                           \
 536       if (the_target->pause_all)                \
 537         (*the_target->pause_all) (freeze);      \
 538     } while (0)
 539
 540 #define unpause_all(unfreeze)                   \
 541   do                                            \
 542     {                                           \
 543       if (the_target->unpause_all)              \
 544         (*the_target->unpause_all) (unfreeze);  \
 545     } while (0)
 546
 547 #define stabilize_threads()                     \
 548   do                                            \
 549     {                                           \
 550       if (the_target->stabilize_threads)        \
 551         (*the_target->stabilize_threads) ();    \
 552     } while (0)
 553
 554 #define install_fast_tracepoint_jump_pad(tpoint, tpaddr,                \
 555                                          collector, lockaddr,           \
 556                                          orig_size,                     \
 557                                          jump_entry,                    \
 558                                          trampoline, trampoline_size,   \
 559                                          jjump_pad_insn,                \
 560                                          jjump_pad_insn_size,           \
 561                                          adjusted_insn_addr,            \
 562                                          adjusted_insn_addr_end,        \
 563                                          err)                           \
 564   (*the_target->install_fast_tracepoint_jump_pad) (tpoint, tpaddr,      \
 565                                                    collector,lockaddr,  \
 566                                                    orig_size, jump_entry, \
 567                                                    trampoline,          \
 568                                                    trampoline_size,     \
 569                                                    jjump_pad_insn,      \
 570                                                    jjump_pad_insn_size, \
 571                                                    adjusted_insn_addr,  \
 572                                                    adjusted_insn_addr_end, \
 573                                                    err)
 574
 575 #define target_emit_ops() \
 576   (the_target->emit_ops ? (*the_target->emit_ops) () : NULL)
 577
 578 #define target_supports_disable_randomization() \
 579   (the_target->supports_disable_randomization ? \
 580    (*the_target->supports_disable_randomization) () : 0)
 581
 582 #define target_supports_agent() \
 583   (the_target->supports_agent ? \
 584    (*the_target->supports_agent) () : 0)
 585
 586 #define target_supports_btrace(format)                  \
 587   (the_target->supports_btrace                          \
 588    ? (*the_target->supports_btrace) (the_target, format) : 0)
 589
 590 #define target_enable_btrace(ptid, conf) \
 591   (*the_target->enable_btrace) (ptid, conf)
 592
 593 #define target_disable_btrace(tinfo) \
 594   (*the_target->disable_btrace) (tinfo)
 595
 596 #define target_read_btrace(tinfo, buffer, type) \
 597   (*the_target->read_btrace) (tinfo, buffer, type)
 598
 599 #define target_read_btrace_conf(tinfo, buffer)  \
 600   (*the_target->read_btrace_conf) (tinfo, buffer)
 601
 602 #define target_supports_range_stepping() \
 603   (the_target->supports_range_stepping ? \
 604    (*the_target->supports_range_stepping) () : 0)
 605
 606 #define target_supports_stopped_by_sw_breakpoint() \
 607   (the_target->supports_stopped_by_sw_breakpoint ? \
 608    (*the_target->supports_stopped_by_sw_breakpoint) () : 0)
 609
 610 #define target_stopped_by_sw_breakpoint() \
 611   (the_target->stopped_by_sw_breakpoint ? \
 612    (*the_target->stopped_by_sw_breakpoint) () : 0)
 613
 614 #define target_supports_stopped_by_hw_breakpoint() \
 615   (the_target->supports_stopped_by_hw_breakpoint ? \
 616    (*the_target->supports_stopped_by_hw_breakpoint) () : 0)
 617
 618 #define target_supports_hardware_single_step() \
 619   (the_target->supports_hardware_single_step ? \
 620    (*the_target->supports_hardware_single_step) () : 0)
 621
 622 #define target_stopped_by_hw_breakpoint() \
 623   (the_target->stopped_by_hw_breakpoint ? \
 624    (*the_target->stopped_by_hw_breakpoint) () : 0)
 625
 626 /* Start non-stop mode, returns 0 on success, -1 on failure.   */
 627
 628 int start_non_stop (int nonstop);
 629
 630 ptid_t mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
 631                int connected_wait);
 632
 633 #define prepare_to_access_memory()              \
 634   (the_target->prepare_to_access_memory         \
 635    ? (*the_target->prepare_to_access_memory) () \
 636    : 0)
 637
 638 #define done_accessing_memory()                         \
 639   do                                                    \
 640     {                                                   \
 641       if (the_target->done_accessing_memory)            \
 642         (*the_target->done_accessing_memory) ();        \
 643     } while (0)
 644
 645 #define target_core_of_thread(ptid)             \
 646   (the_target->core_of_thread ? (*the_target->core_of_thread) (ptid) \
 647    : -1)
 648
 649 int read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len);
 650
 651 int write_inferior_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
 652                            int len);
 653
 654 int set_desired_thread (int id);
 655
 656 const char *target_pid_to_str (ptid_t);
 657
 658 int target_can_do_hardware_single_step (void);
 659
 660 #endif /* TARGET_H */