gdb/target.h

   1 /* Interface between GDB and target environments, including files and processes
   2
   3    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   4    1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
   5
   6    Contributed by Cygnus Support.  Written by John Gilmore.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 59 Temple Place - Suite 330,
  23    Boston, MA 02111-1307, USA.  */
  24
  25 #if !defined (TARGET_H)
  26 #define TARGET_H
  27
  28 struct objfile;
  29 struct ui_file;
  30 struct mem_attrib;
  31 struct target_ops;
  32
  33 /* This include file defines the interface between the main part
  34    of the debugger, and the part which is target-specific, or
  35    specific to the communications interface between us and the
  36    target.
  37
  38    A TARGET is an interface between the debugger and a particular
  39    kind of file or process.  Targets can be STACKED in STRATA,
  40    so that more than one target can potentially respond to a request.
  41    In particular, memory accesses will walk down the stack of targets
  42    until they find a target that is interested in handling that particular
  43    address.  STRATA are artificial boundaries on the stack, within
  44    which particular kinds of targets live.  Strata exist so that
  45    people don't get confused by pushing e.g. a process target and then
  46    a file target, and wondering why they can't see the current values
  47    of variables any more (the file target is handling them and they
  48    never get to the process target).  So when you push a file target,
  49    it goes into the file stratum, which is always below the process
  50    stratum.  */
  51
  52 #include "bfd.h"
  53 #include "symtab.h"
  54 #include "dcache.h"
  55 #include "memattr.h"
  56
  57 enum strata
  58   {
  59     dummy_stratum,              /* The lowest of the low */
  60     file_stratum,               /* Executable files, etc */
  61     core_stratum,               /* Core dump files */
  62     download_stratum,           /* Downloading of remote targets */
  63     process_stratum,            /* Executing processes */
  64     thread_stratum              /* Executing threads */
  65   };
  66
  67 enum thread_control_capabilities
  68   {
  69     tc_none = 0,                /* Default: can't control thread execution.  */
  70     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  71     tc_switch = 2               /* Can switch the running thread on demand.  */
  72   };
  73
  74 /* Stuff for target_wait.  */
  75
  76 /* Generally, what has the program done?  */
  77 enum target_waitkind
  78   {
  79     /* The program has exited.  The exit status is in value.integer.  */
  80     TARGET_WAITKIND_EXITED,
  81
  82     /* The program has stopped with a signal.  Which signal is in
  83        value.sig.  */
  84     TARGET_WAITKIND_STOPPED,
  85
  86     /* The program has terminated with a signal.  Which signal is in
  87        value.sig.  */
  88     TARGET_WAITKIND_SIGNALLED,
  89
  90     /* The program is letting us know that it dynamically loaded something
  91        (e.g. it called load(2) on AIX).  */
  92     TARGET_WAITKIND_LOADED,
  93
  94     /* The program has forked.  A "related" process' ID is in
  95        value.related_pid.  I.e., if the child forks, value.related_pid
  96        is the parent's ID.  */
  97
  98     TARGET_WAITKIND_FORKED,
  99
 100     /* The program has vforked.  A "related" process's ID is in
 101        value.related_pid.  */
 102
 103     TARGET_WAITKIND_VFORKED,
 104
 105     /* The program has exec'ed a new executable file.  The new file's
 106        pathname is pointed to by value.execd_pathname.  */
 107
 108     TARGET_WAITKIND_EXECD,
 109
 110     /* The program has entered or returned from a system call.  On
 111        HP-UX, this is used in the hardware watchpoint implementation.
 112        The syscall's unique integer ID number is in value.syscall_id */
 113
 114     TARGET_WAITKIND_SYSCALL_ENTRY,
 115     TARGET_WAITKIND_SYSCALL_RETURN,
 116
 117     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 118        within target_wait, but I'm not sure target_wait should be resuming the
 119        inferior.  */
 120     TARGET_WAITKIND_SPURIOUS,
 121
 122     /* An event has occured, but we should wait again.
 123        Remote_async_wait() returns this when there is an event
 124        on the inferior, but the rest of the world is not interested in
 125        it. The inferior has not stopped, but has just sent some output
 126        to the console, for instance. In this case, we want to go back
 127        to the event loop and wait there for another event from the
 128        inferior, rather than being stuck in the remote_async_wait()
 129        function. This way the event loop is responsive to other events,
 130        like for instance the user typing.  */
 131     TARGET_WAITKIND_IGNORE
 132   };
 133
 134 struct target_waitstatus
 135   {
 136     enum target_waitkind kind;
 137
 138     /* Forked child pid, execd pathname, exit status or signal number.  */
 139     union
 140       {
 141         int integer;
 142         enum target_signal sig;
 143         int related_pid;
 144         char *execd_pathname;
 145         int syscall_id;
 146       }
 147     value;
 148   };
 149
 150 /* Possible types of events that the inferior handler will have to
 151    deal with.  */
 152 enum inferior_event_type
 153   {
 154     /* There is a request to quit the inferior, abandon it.  */
 155     INF_QUIT_REQ,
 156     /* Process a normal inferior event which will result in target_wait
 157        being called.  */
 158     INF_REG_EVENT,
 159     /* Deal with an error on the inferior.  */
 160     INF_ERROR,
 161     /* We are called because a timer went off.  */
 162     INF_TIMER,
 163     /* We are called to do stuff after the inferior stops.  */
 164     INF_EXEC_COMPLETE,
 165     /* We are called to do some stuff after the inferior stops, but we
 166        are expected to reenter the proceed() and
 167        handle_inferior_event() functions. This is used only in case of
 168        'step n' like commands.  */
 169     INF_EXEC_CONTINUE
 170   };
 171
 172 /* Return the string for a signal.  */
 173 extern char *target_signal_to_string (enum target_signal);
 174
 175 /* Return the name (SIGHUP, etc.) for a signal.  */
 176 extern char *target_signal_to_name (enum target_signal);
 177
 178 /* Given a name (SIGHUP, etc.), return its signal.  */
 179 enum target_signal target_signal_from_name (char *);
 180 \f
 181 /* Request the transfer of up to LEN 8-bit bytes of the target's
 182    OBJECT.  The OFFSET, for a seekable object, specifies the starting
 183    point.  The ANNEX can be used to provide additional data-specific
 184    information to the target.
 185
 186    Return the number of bytes actually transfered, zero when no
 187    further transfer is possible, and -1 when the transfer is not
 188    supported.
 189
 190    NOTE: cagney/2003-10-17: The current interface does not support a
 191    "retry" mechanism.  Instead it assumes that at least one byte will
 192    be transfered on each call.
 193
 194    NOTE: cagney/2003-10-17: The current interface can lead to
 195    fragmented transfers.  Lower target levels should not implement
 196    hacks, such as enlarging the transfer, in an attempt to compensate
 197    for this.  Instead, the target stack should be extended so that it
 198    implements supply/collect methods and a look-aside object cache.
 199    With that available, the lowest target can safely and freely "push"
 200    data up the stack.
 201
 202    NOTE: cagney/2003-10-17: Unlike the old query and the memory
 203    transfer mechanisms, these methods are explicitly parameterized by
 204    the target that it should be applied to.
 205
 206    NOTE: cagney/2003-10-17: Just like the old query and memory xfer
 207    methods, these new methods perform partial transfers.  The only
 208    difference is that these new methods thought to include "partial"
 209    in the name.  The old code's failure to do this lead to much
 210    confusion and duplication of effort as each target object attempted
 211    to locally take responsibility for something it didn't have to
 212    worry about.
 213
 214    NOTE: cagney/2003-10-17: For backward compatibility with the
 215    "target_query" method that this replaced, when BUF, OFFSET and LEN
 216    are NULL/zero, return the "minimum" buffer size.  See "remote.c"
 217    for further information.  */
 218
 219 enum target_object
 220 {
 221   /* Kernel Object Display transfer.  See "kod.c" and "remote.c".  */
 222   TARGET_OBJECT_KOD,
 223   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 224   TARGET_OBJECT_AVR,
 225   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 226   TARGET_OBJECT_MEMORY
 227   /* Possible future ojbects: TARGET_OJBECT_FILE, TARGET_OBJECT_PROC,
 228      TARGET_OBJECT_AUXV, ...  */
 229 };
 230
 231 extern LONGEST target_read_partial (struct target_ops *ops,
 232                                     enum target_object object,
 233                                     const char *annex, void *buf,
 234                                     ULONGEST offset, LONGEST len);
 235
 236 extern LONGEST target_write_partial (struct target_ops *ops,
 237                                      enum target_object object,
 238                                      const char *annex, const void *buf,
 239                                      ULONGEST offset, LONGEST len);
 240
 241 /* Wrappers to perform the full transfer.  */
 242 extern LONGEST target_read (struct target_ops *ops,
 243                             enum target_object object,
 244                             const char *annex, void *buf,
 245                             ULONGEST offset, LONGEST len);
 246
 247 extern LONGEST target_write (struct target_ops *ops,
 248                              enum target_object object,
 249                              const char *annex, const void *buf,
 250                              ULONGEST offset, LONGEST len);
 251 \f
 252
 253 /* If certain kinds of activity happen, target_wait should perform
 254    callbacks.  */
 255 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 256    on TARGET_ACTIVITY_FD.  */
 257 extern int target_activity_fd;
 258 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 259 extern int (*target_activity_function) (void);
 260 \f
 261 struct thread_info;             /* fwd decl for parameter list below: */
 262
 263 struct target_ops
 264   {
 265     struct target_ops *beneath; /* To the target under this one.  */
 266     char *to_shortname;         /* Name this target type */
 267     char *to_longname;          /* Name for printing */
 268     char *to_doc;               /* Documentation.  Does not include trailing
 269                                    newline, and starts with a one-line descrip-
 270                                    tion (probably similar to to_longname).  */
 271     /* The open routine takes the rest of the parameters from the
 272        command, and (if successful) pushes a new target onto the
 273        stack.  Targets should supply this routine, if only to provide
 274        an error message.  */
 275     void (*to_open) (char *, int);
 276     /* Old targets with a static target vector provide "to_close".
 277        New re-entrant targets provide "to_xclose" and that is expected
 278        to xfree everything (including the "struct target_ops").  */
 279     void (*to_xclose) (struct target_ops *targ, int quitting);
 280     void (*to_close) (int);
 281     void (*to_attach) (char *, int);
 282     void (*to_post_attach) (int);
 283     void (*to_detach) (char *, int);
 284     void (*to_disconnect) (char *, int);
 285     void (*to_resume) (ptid_t, int, enum target_signal);
 286     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 287     void (*to_post_wait) (ptid_t, int);
 288     void (*to_fetch_registers) (int);
 289     void (*to_store_registers) (int);
 290     void (*to_prepare_to_store) (void);
 291
 292     /* Transfer LEN bytes of memory between GDB address MYADDR and
 293        target address MEMADDR.  If WRITE, transfer them to the target, else
 294        transfer them from the target.  TARGET is the target from which we
 295        get this function.
 296
 297        Return value, N, is one of the following:
 298
 299        0 means that we can't handle this.  If errno has been set, it is the
 300        error which prevented us from doing it (FIXME: What about bfd_error?).
 301
 302        positive (call it N) means that we have transferred N bytes
 303        starting at MEMADDR.  We might be able to handle more bytes
 304        beyond this length, but no promises.
 305
 306        negative (call its absolute value N) means that we cannot
 307        transfer right at MEMADDR, but we could transfer at least
 308        something at MEMADDR + N.  */
 309
 310     int (*to_xfer_memory) (CORE_ADDR memaddr, char *myaddr,
 311                            int len, int write,
 312                            struct mem_attrib *attrib,
 313                            struct target_ops *target);
 314
 315     void (*to_files_info) (struct target_ops *);
 316     int (*to_insert_breakpoint) (CORE_ADDR, char *);
 317     int (*to_remove_breakpoint) (CORE_ADDR, char *);
 318     int (*to_can_use_hw_breakpoint) (int, int, int);
 319     int (*to_insert_hw_breakpoint) (CORE_ADDR, char *);
 320     int (*to_remove_hw_breakpoint) (CORE_ADDR, char *);
 321     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 322     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 323     int (*to_stopped_by_watchpoint) (void);
 324     int to_have_continuable_watchpoint;
 325     CORE_ADDR (*to_stopped_data_address) (void);
 326     int (*to_region_size_ok_for_hw_watchpoint) (int);
 327     void (*to_terminal_init) (void);
 328     void (*to_terminal_inferior) (void);
 329     void (*to_terminal_ours_for_output) (void);
 330     void (*to_terminal_ours) (void);
 331     void (*to_terminal_save_ours) (void);
 332     void (*to_terminal_info) (char *, int);
 333     void (*to_kill) (void);
 334     void (*to_load) (char *, int);
 335     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 336     void (*to_create_inferior) (char *, char *, char **);
 337     void (*to_post_startup_inferior) (ptid_t);
 338     void (*to_acknowledge_created_inferior) (int);
 339     int (*to_insert_fork_catchpoint) (int);
 340     int (*to_remove_fork_catchpoint) (int);
 341     int (*to_insert_vfork_catchpoint) (int);
 342     int (*to_remove_vfork_catchpoint) (int);
 343     int (*to_follow_fork) (int);
 344     int (*to_insert_exec_catchpoint) (int);
 345     int (*to_remove_exec_catchpoint) (int);
 346     int (*to_reported_exec_events_per_exec_call) (void);
 347     int (*to_has_exited) (int, int, int *);
 348     void (*to_mourn_inferior) (void);
 349     int (*to_can_run) (void);
 350     void (*to_notice_signals) (ptid_t ptid);
 351     int (*to_thread_alive) (ptid_t ptid);
 352     void (*to_find_new_threads) (void);
 353     char *(*to_pid_to_str) (ptid_t);
 354     char *(*to_extra_thread_info) (struct thread_info *);
 355     void (*to_stop) (void);
 356     void (*to_rcmd) (char *command, struct ui_file *output);
 357     struct symtab_and_line *(*to_enable_exception_callback) (enum
 358                                                              exception_event_kind,
 359                                                              int);
 360     struct exception_event_record *(*to_get_current_exception_event) (void);
 361     char *(*to_pid_to_exec_file) (int pid);
 362     enum strata to_stratum;
 363     int to_has_all_memory;
 364     int to_has_memory;
 365     int to_has_stack;
 366     int to_has_registers;
 367     int to_has_execution;
 368     int to_has_thread_control;  /* control thread execution */
 369     struct section_table
 370      *to_sections;
 371     struct section_table
 372      *to_sections_end;
 373     /* ASYNC target controls */
 374     int (*to_can_async_p) (void);
 375     int (*to_is_async_p) (void);
 376     void (*to_async) (void (*cb) (enum inferior_event_type, void *context),
 377                       void *context);
 378     int to_async_mask_value;
 379     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 380                                             unsigned long,
 381                                             int, int, int,
 382                                             void *),
 383                                    void *);
 384     char * (*to_make_corefile_notes) (bfd *, int *);
 385
 386     /* Return the thread-local address at OFFSET in the
 387        thread-local storage for the thread PTID and the shared library
 388        or executable file given by OBJFILE.  If that block of
 389        thread-local storage hasn't been allocated yet, this function
 390        may return an error.  */
 391     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 392                                               struct objfile *objfile,
 393                                               CORE_ADDR offset);
 394
 395     /* See above.  */
 396     LONGEST (*to_read_partial) (struct target_ops *ops,
 397                                 enum target_object object,
 398                                 const char *annex, void *buf,
 399                                 ULONGEST offset, LONGEST len);
 400     LONGEST (*to_write_partial) (struct target_ops *ops,
 401                                  enum target_object object,
 402                                  const char *annex, const void *buf,
 403                                  ULONGEST offset, LONGEST len);
 404
 405     int to_magic;
 406     /* Need sub-structure for target machine related rather than comm related?
 407      */
 408   };
 409
 410 /* Magic number for checking ops size.  If a struct doesn't end with this
 411    number, somebody changed the declaration but didn't change all the
 412    places that initialize one.  */
 413
 414 #define OPS_MAGIC       3840
 415
 416 /* The ops structure for our "current" target process.  This should
 417    never be NULL.  If there is no target, it points to the dummy_target.  */
 418
 419 extern struct target_ops current_target;
 420
 421 /* Define easy words for doing these operations on our current target.  */
 422
 423 #define target_shortname        (current_target.to_shortname)
 424 #define target_longname         (current_target.to_longname)
 425
 426 /* Does whatever cleanup is required for a target that we are no
 427    longer going to be calling.  QUITTING indicates that GDB is exiting
 428    and should not get hung on an error (otherwise it is important to
 429    perform clean termination, even if it takes a while).  This routine
 430    is automatically always called when popping the target off the
 431    target stack (to_beneath is undefined).  Closing file descriptors
 432    and freeing all memory allocated memory are typical things it
 433    should do.  */
 434
 435 void target_close (struct target_ops *targ, int quitting);
 436
 437 /* Attaches to a process on the target side.  Arguments are as passed
 438    to the `attach' command by the user.  This routine can be called
 439    when the target is not on the target-stack, if the target_can_run
 440    routine returns 1; in that case, it must push itself onto the stack.
 441    Upon exit, the target should be ready for normal operations, and
 442    should be ready to deliver the status of the process immediately
 443    (without waiting) to an upcoming target_wait call.  */
 444
 445 #define target_attach(args, from_tty)   \
 446      (*current_target.to_attach) (args, from_tty)
 447
 448 /* The target_attach operation places a process under debugger control,
 449    and stops the process.
 450
 451    This operation provides a target-specific hook that allows the
 452    necessary bookkeeping to be performed after an attach completes.  */
 453 #define target_post_attach(pid) \
 454      (*current_target.to_post_attach) (pid)
 455
 456 /* Takes a program previously attached to and detaches it.
 457    The program may resume execution (some targets do, some don't) and will
 458    no longer stop on signals, etc.  We better not have left any breakpoints
 459    in the program or it'll die when it hits one.  ARGS is arguments
 460    typed by the user (e.g. a signal to send the process).  FROM_TTY
 461    says whether to be verbose or not.  */
 462
 463 extern void target_detach (char *, int);
 464
 465 /* Disconnect from the current target without resuming it (leaving it
 466    waiting for a debugger).  */
 467
 468 extern void target_disconnect (char *, int);
 469
 470 /* Resume execution of the target process PTID.  STEP says whether to
 471    single-step or to run free; SIGGNAL is the signal to be given to
 472    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 473    pass TARGET_SIGNAL_DEFAULT.  */
 474
 475 #define target_resume(ptid, step, siggnal)                              \
 476   do {                                                                  \
 477     dcache_invalidate(target_dcache);                                   \
 478     (*current_target.to_resume) (ptid, step, siggnal);                  \
 479   } while (0)
 480
 481 /* Wait for process pid to do something.  PTID = -1 to wait for any
 482    pid to do something.  Return pid of child, or -1 in case of error;
 483    store status through argument pointer STATUS.  Note that it is
 484    _NOT_ OK to throw_exception() out of target_wait() without popping
 485    the debugging target from the stack; GDB isn't prepared to get back
 486    to the prompt with a debugging target but without the frame cache,
 487    stop_pc, etc., set up.  */
 488
 489 #define target_wait(ptid, status)               \
 490      (*current_target.to_wait) (ptid, status)
 491
 492 /* The target_wait operation waits for a process event to occur, and
 493    thereby stop the process.
 494
 495    On some targets, certain events may happen in sequences.  gdb's
 496    correct response to any single event of such a sequence may require
 497    knowledge of what earlier events in the sequence have been seen.
 498
 499    This operation provides a target-specific hook that allows the
 500    necessary bookkeeping to be performed to track such sequences.  */
 501
 502 #define target_post_wait(ptid, status) \
 503      (*current_target.to_post_wait) (ptid, status)
 504
 505 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 506
 507 #define target_fetch_registers(regno)   \
 508      (*current_target.to_fetch_registers) (regno)
 509
 510 /* Store at least register REGNO, or all regs if REGNO == -1.
 511    It can store as many registers as it wants to, so target_prepare_to_store
 512    must have been previously called.  Calls error() if there are problems.  */
 513
 514 #define target_store_registers(regs)    \
 515      (*current_target.to_store_registers) (regs)
 516
 517 /* Get ready to modify the registers array.  On machines which store
 518    individual registers, this doesn't need to do anything.  On machines
 519    which store all the registers in one fell swoop, this makes sure
 520    that REGISTERS contains all the registers from the program being
 521    debugged.  */
 522
 523 #define target_prepare_to_store()       \
 524      (*current_target.to_prepare_to_store) ()
 525
 526 extern DCACHE *target_dcache;
 527
 528 extern int do_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
 529                            struct mem_attrib *attrib);
 530
 531 extern int target_read_string (CORE_ADDR, char **, int, int *);
 532
 533 extern int target_read_memory (CORE_ADDR memaddr, char *myaddr, int len);
 534
 535 extern int target_write_memory (CORE_ADDR memaddr, char *myaddr, int len);
 536
 537 extern int xfer_memory (CORE_ADDR, char *, int, int,
 538                         struct mem_attrib *, struct target_ops *);
 539
 540 extern int child_xfer_memory (CORE_ADDR, char *, int, int,
 541                               struct mem_attrib *, struct target_ops *);
 542
 543 /* Make a single attempt at transfering LEN bytes.  On a successful
 544    transfer, the number of bytes actually transfered is returned and
 545    ERR is set to 0.  When a transfer fails, -1 is returned (the number
 546    of bytes actually transfered is not defined) and ERR is set to a
 547    non-zero error indication.  */
 548
 549 extern int target_read_memory_partial (CORE_ADDR addr, char *buf, int len,
 550                                        int *err);
 551
 552 extern int target_write_memory_partial (CORE_ADDR addr, char *buf, int len,
 553                                         int *err);
 554
 555 extern char *child_pid_to_exec_file (int);
 556
 557 extern char *child_core_file_to_sym_file (char *);
 558
 559 #if defined(CHILD_POST_ATTACH)
 560 extern void child_post_attach (int);
 561 #endif
 562
 563 extern void child_post_wait (ptid_t, int);
 564
 565 extern void child_post_startup_inferior (ptid_t);
 566
 567 extern void child_acknowledge_created_inferior (int);
 568
 569 extern int child_insert_fork_catchpoint (int);
 570
 571 extern int child_remove_fork_catchpoint (int);
 572
 573 extern int child_insert_vfork_catchpoint (int);
 574
 575 extern int child_remove_vfork_catchpoint (int);
 576
 577 extern void child_acknowledge_created_inferior (int);
 578
 579 extern int child_follow_fork (int);
 580
 581 extern int child_insert_exec_catchpoint (int);
 582
 583 extern int child_remove_exec_catchpoint (int);
 584
 585 extern int child_reported_exec_events_per_exec_call (void);
 586
 587 extern int child_has_exited (int, int, int *);
 588
 589 extern int child_thread_alive (ptid_t);
 590
 591 /* From infrun.c.  */
 592
 593 extern int inferior_has_forked (int pid, int *child_pid);
 594
 595 extern int inferior_has_vforked (int pid, int *child_pid);
 596
 597 extern int inferior_has_execd (int pid, char **execd_pathname);
 598
 599 /* From exec.c */
 600
 601 extern void print_section_info (struct target_ops *, bfd *);
 602
 603 /* Print a line about the current target.  */
 604
 605 #define target_files_info()     \
 606      (*current_target.to_files_info) (&current_target)
 607
 608 /* Insert a breakpoint at address ADDR in the target machine.  SAVE is
 609    a pointer to memory allocated for saving the target contents.  It
 610    is guaranteed by the caller to be long enough to save the number of
 611    breakpoint bytes indicated by BREAKPOINT_FROM_PC.  Result is 0 for
 612    success, or an errno value.  */
 613
 614 #define target_insert_breakpoint(addr, save)    \
 615      (*current_target.to_insert_breakpoint) (addr, save)
 616
 617 /* Remove a breakpoint at address ADDR in the target machine.
 618    SAVE is a pointer to the same save area
 619    that was previously passed to target_insert_breakpoint.
 620    Result is 0 for success, or an errno value.  */
 621
 622 #define target_remove_breakpoint(addr, save)    \
 623      (*current_target.to_remove_breakpoint) (addr, save)
 624
 625 /* Initialize the terminal settings we record for the inferior,
 626    before we actually run the inferior.  */
 627
 628 #define target_terminal_init() \
 629      (*current_target.to_terminal_init) ()
 630
 631 /* Put the inferior's terminal settings into effect.
 632    This is preparation for starting or resuming the inferior.  */
 633
 634 #define target_terminal_inferior() \
 635      (*current_target.to_terminal_inferior) ()
 636
 637 /* Put some of our terminal settings into effect,
 638    enough to get proper results from our output,
 639    but do not change into or out of RAW mode
 640    so that no input is discarded.
 641
 642    After doing this, either terminal_ours or terminal_inferior
 643    should be called to get back to a normal state of affairs.  */
 644
 645 #define target_terminal_ours_for_output() \
 646      (*current_target.to_terminal_ours_for_output) ()
 647
 648 /* Put our terminal settings into effect.
 649    First record the inferior's terminal settings
 650    so they can be restored properly later.  */
 651
 652 #define target_terminal_ours() \
 653      (*current_target.to_terminal_ours) ()
 654
 655 /* Save our terminal settings.
 656    This is called from TUI after entering or leaving the curses
 657    mode.  Since curses modifies our terminal this call is here
 658    to take this change into account.  */
 659
 660 #define target_terminal_save_ours() \
 661      (*current_target.to_terminal_save_ours) ()
 662
 663 /* Print useful information about our terminal status, if such a thing
 664    exists.  */
 665
 666 #define target_terminal_info(arg, from_tty) \
 667      (*current_target.to_terminal_info) (arg, from_tty)
 668
 669 /* Kill the inferior process.   Make it go away.  */
 670
 671 #define target_kill() \
 672      (*current_target.to_kill) ()
 673
 674 /* Load an executable file into the target process.  This is expected
 675    to not only bring new code into the target process, but also to
 676    update GDB's symbol tables to match.  */
 677
 678 extern void target_load (char *arg, int from_tty);
 679
 680 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 681    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 682    symbol should be returned.  The result is 0 if successful, nonzero
 683    if the symbol does not exist in the target environment.  This
 684    function should not call error() if communication with the target
 685    is interrupted, since it is called from symbol reading, but should
 686    return nonzero, possibly doing a complain().  */
 687
 688 #define target_lookup_symbol(name, addrp) \
 689      (*current_target.to_lookup_symbol) (name, addrp)
 690
 691 /* Start an inferior process and set inferior_ptid to its pid.
 692    EXEC_FILE is the file to run.
 693    ALLARGS is a string containing the arguments to the program.
 694    ENV is the environment vector to pass.  Errors reported with error().
 695    On VxWorks and various standalone systems, we ignore exec_file.  */
 696
 697 #define target_create_inferior(exec_file, args, env)    \
 698      (*current_target.to_create_inferior) (exec_file, args, env)
 699
 700
 701 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 702    notification of inferior events such as fork and vork immediately
 703    after the inferior is created.  (This because of how gdb gets an
 704    inferior created via invoking a shell to do it.  In such a scenario,
 705    if the shell init file has commands in it, the shell will fork and
 706    exec for each of those commands, and we will see each such fork
 707    event.  Very bad.)
 708
 709    Such targets will supply an appropriate definition for this function.  */
 710
 711 #define target_post_startup_inferior(ptid) \
 712      (*current_target.to_post_startup_inferior) (ptid)
 713
 714 /* On some targets, the sequence of starting up an inferior requires
 715    some synchronization between gdb and the new inferior process, PID.  */
 716
 717 #define target_acknowledge_created_inferior(pid) \
 718      (*current_target.to_acknowledge_created_inferior) (pid)
 719
 720 /* On some targets, we can catch an inferior fork or vfork event when
 721    it occurs.  These functions insert/remove an already-created
 722    catchpoint for such events.  */
 723
 724 #define target_insert_fork_catchpoint(pid) \
 725      (*current_target.to_insert_fork_catchpoint) (pid)
 726
 727 #define target_remove_fork_catchpoint(pid) \
 728      (*current_target.to_remove_fork_catchpoint) (pid)
 729
 730 #define target_insert_vfork_catchpoint(pid) \
 731      (*current_target.to_insert_vfork_catchpoint) (pid)
 732
 733 #define target_remove_vfork_catchpoint(pid) \
 734      (*current_target.to_remove_vfork_catchpoint) (pid)
 735
 736 /* If the inferior forks or vforks, this function will be called at
 737    the next resume in order to perform any bookkeeping and fiddling
 738    necessary to continue debugging either the parent or child, as
 739    requested, and releasing the other.  Information about the fork
 740    or vfork event is available via get_last_target_status ().
 741    This function returns 1 if the inferior should not be resumed
 742    (i.e. there is another event pending).  */
 743
 744 #define target_follow_fork(follow_child) \
 745      (*current_target.to_follow_fork) (follow_child)
 746
 747 /* On some targets, we can catch an inferior exec event when it
 748    occurs.  These functions insert/remove an already-created
 749    catchpoint for such events.  */
 750
 751 #define target_insert_exec_catchpoint(pid) \
 752      (*current_target.to_insert_exec_catchpoint) (pid)
 753
 754 #define target_remove_exec_catchpoint(pid) \
 755      (*current_target.to_remove_exec_catchpoint) (pid)
 756
 757 /* Returns the number of exec events that are reported when a process
 758    invokes a flavor of the exec() system call on this target, if exec
 759    events are being reported.  */
 760
 761 #define target_reported_exec_events_per_exec_call() \
 762      (*current_target.to_reported_exec_events_per_exec_call) ()
 763
 764 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 765    exit code of PID, if any.  */
 766
 767 #define target_has_exited(pid,wait_status,exit_status) \
 768      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 769
 770 /* The debugger has completed a blocking wait() call.  There is now
 771    some process event that must be processed.  This function should
 772    be defined by those targets that require the debugger to perform
 773    cleanup or internal state changes in response to the process event.  */
 774
 775 /* The inferior process has died.  Do what is right.  */
 776
 777 #define target_mourn_inferior() \
 778      (*current_target.to_mourn_inferior) ()
 779
 780 /* Does target have enough data to do a run or attach command? */
 781
 782 #define target_can_run(t) \
 783      ((t)->to_can_run) ()
 784
 785 /* post process changes to signal handling in the inferior.  */
 786
 787 #define target_notice_signals(ptid) \
 788      (*current_target.to_notice_signals) (ptid)
 789
 790 /* Check to see if a thread is still alive.  */
 791
 792 #define target_thread_alive(ptid) \
 793      (*current_target.to_thread_alive) (ptid)
 794
 795 /* Query for new threads and add them to the thread list.  */
 796
 797 #define target_find_new_threads() \
 798      (*current_target.to_find_new_threads) (); \
 799
 800 /* Make target stop in a continuable fashion.  (For instance, under
 801    Unix, this should act like SIGSTOP).  This function is normally
 802    used by GUIs to implement a stop button.  */
 803
 804 #define target_stop current_target.to_stop
 805
 806 /* Send the specified COMMAND to the target's monitor
 807    (shell,interpreter) for execution.  The result of the query is
 808    placed in OUTBUF.  */
 809
 810 #define target_rcmd(command, outbuf) \
 811      (*current_target.to_rcmd) (command, outbuf)
 812
 813
 814 /* Get the symbol information for a breakpointable routine called when
 815    an exception event occurs.
 816    Intended mainly for C++, and for those
 817    platforms/implementations where such a callback mechanism is available,
 818    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 819    different mechanisms for debugging exceptions.  */
 820
 821 #define target_enable_exception_callback(kind, enable) \
 822      (*current_target.to_enable_exception_callback) (kind, enable)
 823
 824 /* Get the current exception event kind -- throw or catch, etc.  */
 825
 826 #define target_get_current_exception_event() \
 827      (*current_target.to_get_current_exception_event) ()
 828
 829 /* Does the target include all of memory, or only part of it?  This
 830    determines whether we look up the target chain for other parts of
 831    memory if this target can't satisfy a request.  */
 832
 833 #define target_has_all_memory   \
 834      (current_target.to_has_all_memory)
 835
 836 /* Does the target include memory?  (Dummy targets don't.)  */
 837
 838 #define target_has_memory       \
 839      (current_target.to_has_memory)
 840
 841 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 842    we start a process.)  */
 843
 844 #define target_has_stack        \
 845      (current_target.to_has_stack)
 846
 847 /* Does the target have registers?  (Exec files don't.)  */
 848
 849 #define target_has_registers    \
 850      (current_target.to_has_registers)
 851
 852 /* Does the target have execution?  Can we make it jump (through
 853    hoops), or pop its stack a few times?  FIXME: If this is to work that
 854    way, it needs to check whether an inferior actually exists.
 855    remote-udi.c and probably other targets can be the current target
 856    when the inferior doesn't actually exist at the moment.  Right now
 857    this just tells us whether this target is *capable* of execution.  */
 858
 859 #define target_has_execution    \
 860      (current_target.to_has_execution)
 861
 862 /* Can the target support the debugger control of thread execution?
 863    a) Can it lock the thread scheduler?
 864    b) Can it switch the currently running thread?  */
 865
 866 #define target_can_lock_scheduler \
 867      (current_target.to_has_thread_control & tc_schedlock)
 868
 869 #define target_can_switch_threads \
 870      (current_target.to_has_thread_control & tc_switch)
 871
 872 /* Can the target support asynchronous execution? */
 873 #define target_can_async_p() (current_target.to_can_async_p ())
 874
 875 /* Is the target in asynchronous execution mode? */
 876 #define target_is_async_p() (current_target.to_is_async_p())
 877
 878 /* Put the target in async mode with the specified callback function. */
 879 #define target_async(CALLBACK,CONTEXT) \
 880      (current_target.to_async((CALLBACK), (CONTEXT)))
 881
 882 /* This is to be used ONLY within call_function_by_hand(). It provides
 883    a workaround, to have inferior function calls done in sychronous
 884    mode, even though the target is asynchronous. After
 885    target_async_mask(0) is called, calls to target_can_async_p() will
 886    return FALSE , so that target_resume() will not try to start the
 887    target asynchronously. After the inferior stops, we IMMEDIATELY
 888    restore the previous nature of the target, by calling
 889    target_async_mask(1). After that, target_can_async_p() will return
 890    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 891
 892    FIXME ezannoni 1999-12-13: we won't need this once we move
 893    the turning async on and off to the single execution commands,
 894    from where it is done currently, in remote_resume().  */
 895
 896 #define target_async_mask_value \
 897      (current_target.to_async_mask_value)
 898
 899 extern int target_async_mask (int mask);
 900
 901 extern void target_link (char *, CORE_ADDR *);
 902
 903 /* Converts a process id to a string.  Usually, the string just contains
 904    `process xyz', but on some systems it may contain
 905    `process xyz thread abc'.  */
 906
 907 #undef target_pid_to_str
 908 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
 909
 910 #ifndef target_tid_to_str
 911 #define target_tid_to_str(PID) \
 912      target_pid_to_str (PID)
 913 extern char *normal_pid_to_str (ptid_t ptid);
 914 #endif
 915
 916 /* Return a short string describing extra information about PID,
 917    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
 918    is okay.  */
 919
 920 #define target_extra_thread_info(TP) \
 921      (current_target.to_extra_thread_info (TP))
 922
 923 /*
 924  * New Objfile Event Hook:
 925  *
 926  * Sometimes a GDB component wants to get notified whenever a new
 927  * objfile is loaded.  Mainly this is used by thread-debugging
 928  * implementations that need to know when symbols for the target
 929  * thread implemenation are available.
 930  *
 931  * The old way of doing this is to define a macro 'target_new_objfile'
 932  * that points to the function that you want to be called on every
 933  * objfile/shlib load.
 934  *
 935  * The new way is to grab the function pointer, 'target_new_objfile_hook',
 936  * and point it to the function that you want to be called on every
 937  * objfile/shlib load.
 938  *
 939  * If multiple clients are willing to be cooperative, they can each
 940  * save a pointer to the previous value of target_new_objfile_hook
 941  * before modifying it, and arrange for their function to call the
 942  * previous function in the chain.  In that way, multiple clients
 943  * can receive this notification (something like with signal handlers).
 944  */
 945
 946 extern void (*target_new_objfile_hook) (struct objfile *);
 947
 948 #ifndef target_pid_or_tid_to_str
 949 #define target_pid_or_tid_to_str(ID) \
 950      target_pid_to_str (ID)
 951 #endif
 952
 953 /* Attempts to find the pathname of the executable file
 954    that was run to create a specified process.
 955
 956    The process PID must be stopped when this operation is used.
 957
 958    If the executable file cannot be determined, NULL is returned.
 959
 960    Else, a pointer to a character string containing the pathname
 961    is returned.  This string should be copied into a buffer by
 962    the client if the string will not be immediately used, or if
 963    it must persist.  */
 964
 965 #define target_pid_to_exec_file(pid) \
 966      (current_target.to_pid_to_exec_file) (pid)
 967
 968 /*
 969  * Iterator function for target memory regions.
 970  * Calls a callback function once for each memory region 'mapped'
 971  * in the child process.  Defined as a simple macro rather than
 972  * as a function macro so that it can be tested for nullity.
 973  */
 974
 975 #define target_find_memory_regions(FUNC, DATA) \
 976      (current_target.to_find_memory_regions) (FUNC, DATA)
 977
 978 /*
 979  * Compose corefile .note section.
 980  */
 981
 982 #define target_make_corefile_notes(BFD, SIZE_P) \
 983      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
 984
 985 /* Thread-local values.  */
 986 #define target_get_thread_local_address \
 987     (current_target.to_get_thread_local_address)
 988 #define target_get_thread_local_address_p() \
 989     (target_get_thread_local_address != NULL)
 990
 991 /* Hook to call target dependent code just after inferior target process has
 992    started.  */
 993
 994 #ifndef TARGET_CREATE_INFERIOR_HOOK
 995 #define TARGET_CREATE_INFERIOR_HOOK(PID)
 996 #endif
 997
 998 /* Hardware watchpoint interfaces.  */
 999
1000 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1001    write).  */
1002
1003 #ifndef STOPPED_BY_WATCHPOINT
1004 #define STOPPED_BY_WATCHPOINT(w) \
1005    (*current_target.to_stopped_by_watchpoint) ()
1006 #endif
1007
1008 /* Non-zero if we have continuable watchpoints  */
1009
1010 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1011 #define HAVE_CONTINUABLE_WATCHPOINT \
1012    (current_target.to_have_continuable_watchpoint)
1013 #endif
1014
1015 /* HP-UX supplies these operations, which respectively disable and enable
1016    the memory page-protections that are used to implement hardware watchpoints
1017    on that platform.  See wait_for_inferior's use of these.  */
1018
1019 #if !defined(TARGET_DISABLE_HW_WATCHPOINTS)
1020 #define TARGET_DISABLE_HW_WATCHPOINTS(pid)
1021 #endif
1022
1023 #if !defined(TARGET_ENABLE_HW_WATCHPOINTS)
1024 #define TARGET_ENABLE_HW_WATCHPOINTS(pid)
1025 #endif
1026
1027 /* Provide defaults for hardware watchpoint functions.  */
1028
1029 /* If the *_hw_beakpoint functions have not been defined
1030    elsewhere use the definitions in the target vector.  */
1031
1032 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1033    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1034    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1035    (including this one?).  OTHERTYPE is who knows what...  */
1036
1037 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1038 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1039  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1040 #endif
1041
1042 #if !defined(TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT)
1043 #define TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT(byte_count) \
1044     (*current_target.to_region_size_ok_for_hw_watchpoint) (byte_count)
1045 #endif
1046
1047
1048 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1049    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1050    success, non-zero for failure.  */
1051
1052 #ifndef target_insert_watchpoint
1053 #define target_insert_watchpoint(addr, len, type)       \
1054      (*current_target.to_insert_watchpoint) (addr, len, type)
1055
1056 #define target_remove_watchpoint(addr, len, type)       \
1057      (*current_target.to_remove_watchpoint) (addr, len, type)
1058 #endif
1059
1060 #ifndef target_insert_hw_breakpoint
1061 #define target_insert_hw_breakpoint(addr, save) \
1062      (*current_target.to_insert_hw_breakpoint) (addr, save)
1063
1064 #define target_remove_hw_breakpoint(addr, save) \
1065      (*current_target.to_remove_hw_breakpoint) (addr, save)
1066 #endif
1067
1068 #ifndef target_stopped_data_address
1069 #define target_stopped_data_address() \
1070     (*current_target.to_stopped_data_address) ()
1071 #endif
1072
1073 /* If defined, then we need to decr pc by this much after a hardware break-
1074    point.  Presumably this overrides DECR_PC_AFTER_BREAK...  */
1075
1076 #ifndef DECR_PC_AFTER_HW_BREAK
1077 #define DECR_PC_AFTER_HW_BREAK 0
1078 #endif
1079
1080 /* Sometimes gdb may pick up what appears to be a valid target address
1081    from a minimal symbol, but the value really means, essentially,
1082    "This is an index into a table which is populated when the inferior
1083    is run.  Therefore, do not attempt to use this as a PC."  */
1084
1085 #if !defined(PC_REQUIRES_RUN_BEFORE_USE)
1086 #define PC_REQUIRES_RUN_BEFORE_USE(pc) (0)
1087 #endif
1088
1089 /* This will only be defined by a target that supports catching vfork events,
1090    such as HP-UX.
1091
1092    On some targets (such as HP-UX 10.20 and earlier), resuming a newly vforked
1093    child process after it has exec'd, causes the parent process to resume as
1094    well.  To prevent the parent from running spontaneously, such targets should
1095    define this to a function that prevents that from happening.  */
1096 #if !defined(ENSURE_VFORKING_PARENT_REMAINS_STOPPED)
1097 #define ENSURE_VFORKING_PARENT_REMAINS_STOPPED(PID) (0)
1098 #endif
1099
1100 /* This will only be defined by a target that supports catching vfork events,
1101    such as HP-UX.
1102
1103    On some targets (such as HP-UX 10.20 and earlier), a newly vforked child
1104    process must be resumed when it delivers its exec event, before the parent
1105    vfork event will be delivered to us.  */
1106
1107 #if !defined(RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK)
1108 #define RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK() (0)
1109 #endif
1110
1111 /* Routines for maintenance of the target structures...
1112
1113    add_target:   Add a target to the list of all possible targets.
1114
1115    push_target:  Make this target the top of the stack of currently used
1116    targets, within its particular stratum of the stack.  Result
1117    is 0 if now atop the stack, nonzero if not on top (maybe
1118    should warn user).
1119
1120    unpush_target: Remove this from the stack of currently used targets,
1121    no matter where it is on the list.  Returns 0 if no
1122    change, 1 if removed from stack.
1123
1124    pop_target:   Remove the top thing on the stack of current targets.  */
1125
1126 extern void add_target (struct target_ops *);
1127
1128 extern int push_target (struct target_ops *);
1129
1130 extern int unpush_target (struct target_ops *);
1131
1132 extern void target_preopen (int);
1133
1134 extern void pop_target (void);
1135
1136 /* Struct section_table maps address ranges to file sections.  It is
1137    mostly used with BFD files, but can be used without (e.g. for handling
1138    raw disks, or files not in formats handled by BFD).  */
1139
1140 struct section_table
1141   {
1142     CORE_ADDR addr;             /* Lowest address in section */
1143     CORE_ADDR endaddr;          /* 1+highest address in section */
1144
1145     sec_ptr the_bfd_section;
1146
1147     bfd *bfd;                   /* BFD file pointer */
1148   };
1149
1150 /* Return the "section" containing the specified address.  */
1151 struct section_table *target_section_by_addr (struct target_ops *target,
1152                                               CORE_ADDR addr);
1153
1154
1155 /* From mem-break.c */
1156
1157 extern int memory_remove_breakpoint (CORE_ADDR, char *);
1158
1159 extern int memory_insert_breakpoint (CORE_ADDR, char *);
1160
1161 extern int default_memory_remove_breakpoint (CORE_ADDR, char *);
1162
1163 extern int default_memory_insert_breakpoint (CORE_ADDR, char *);
1164
1165
1166 /* From target.c */
1167
1168 extern void initialize_targets (void);
1169
1170 extern void noprocess (void);
1171
1172 extern void find_default_attach (char *, int);
1173
1174 extern void find_default_create_inferior (char *, char *, char **);
1175
1176 extern struct target_ops *find_run_target (void);
1177
1178 extern struct target_ops *find_core_target (void);
1179
1180 extern struct target_ops *find_target_beneath (struct target_ops *);
1181
1182 extern int target_resize_to_sections (struct target_ops *target,
1183                                       int num_added);
1184
1185 extern void remove_target_sections (bfd *abfd);
1186
1187 \f
1188 /* Stuff that should be shared among the various remote targets.  */
1189
1190 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1191    information (higher values, more information).  */
1192 extern int remote_debug;
1193
1194 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1195 extern int baud_rate;
1196 /* Timeout limit for response from target. */
1197 extern int remote_timeout;
1198
1199 \f
1200 /* Functions for helping to write a native target.  */
1201
1202 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1203 extern void store_waitstatus (struct target_waitstatus *, int);
1204
1205 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1206    targ_signal SIGNO has an equivalent ``host'' representation.  */
1207 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1208    to the shorter target_signal_p() because it is far less ambigious.
1209    In this context ``target_signal'' refers to GDB's internal
1210    representation of the target's set of signals while ``host signal''
1211    refers to the target operating system's signal.  Confused?  */
1212
1213 extern int target_signal_to_host_p (enum target_signal signo);
1214
1215 /* Convert between host signal numbers and enum target_signal's.
1216    target_signal_to_host() returns 0 and prints a warning() on GDB's
1217    console if SIGNO has no equivalent host representation.  */
1218 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1219    refering to the target operating system's signal numbering.
1220    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1221    gdb_signal'' would probably be better as it is refering to GDB's
1222    internal representation of a target operating system's signal.  */
1223
1224 extern enum target_signal target_signal_from_host (int);
1225 extern int target_signal_to_host (enum target_signal);
1226
1227 /* Convert from a number used in a GDB command to an enum target_signal.  */
1228 extern enum target_signal target_signal_from_command (int);
1229
1230 /* Any target can call this to switch to remote protocol (in remote.c). */
1231 extern void push_remote_target (char *name, int from_tty);
1232 \f
1233 /* Imported from machine dependent code */
1234
1235 /* Blank target vector entries are initialized to target_ignore. */
1236 void target_ignore (void);
1237
1238 #endif /* !defined (TARGET_H) */