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: With a TARGET_OBJECT_KOD object, for
 215    backward compatibility with the "target_query" method that this
 216    replaced, when OFFSET and LEN are both zero, return the "minimum"
 217    buffer size.  See "remote.c" 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   /* Kernel Unwind Table.  See "ia64-tdep.c".  */
 228   TARGET_OBJECT_UNWIND_TABLE,
 229   /* Possible future objects: TARGET_OBJECT_FILE, TARGET_OBJECT_PROC,
 230      TARGET_OBJECT_AUXV, ...  */
 231 };
 232
 233 extern LONGEST target_read_partial (struct target_ops *ops,
 234                                     enum target_object object,
 235                                     const char *annex, void *buf,
 236                                     ULONGEST offset, LONGEST len);
 237
 238 extern LONGEST target_write_partial (struct target_ops *ops,
 239                                      enum target_object object,
 240                                      const char *annex, const void *buf,
 241                                      ULONGEST offset, LONGEST len);
 242
 243 /* Wrappers to perform the full transfer.  */
 244 extern LONGEST target_read (struct target_ops *ops,
 245                             enum target_object object,
 246                             const char *annex, void *buf,
 247                             ULONGEST offset, LONGEST len);
 248
 249 extern LONGEST target_write (struct target_ops *ops,
 250                              enum target_object object,
 251                              const char *annex, const void *buf,
 252                              ULONGEST offset, LONGEST len);
 253
 254 /* Wrappers to target read/write that perform memory transfers.  They
 255    throw an error if the memory transfer fails.
 256
 257    NOTE: cagney/2003-10-23: The naming schema is lifted from
 258    "frame.h".  The parameter order is lifted from get_frame_memory,
 259    which in turn lifted it from read_memory.  */
 260
 261 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 262                                void *buf, LONGEST len);
 263 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 264                                             CORE_ADDR addr, int len);
 265 \f
 266
 267 /* If certain kinds of activity happen, target_wait should perform
 268    callbacks.  */
 269 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 270    on TARGET_ACTIVITY_FD.  */
 271 extern int target_activity_fd;
 272 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 273 extern int (*target_activity_function) (void);
 274 \f
 275 struct thread_info;             /* fwd decl for parameter list below: */
 276
 277 struct target_ops
 278   {
 279     struct target_ops *beneath; /* To the target under this one.  */
 280     char *to_shortname;         /* Name this target type */
 281     char *to_longname;          /* Name for printing */
 282     char *to_doc;               /* Documentation.  Does not include trailing
 283                                    newline, and starts with a one-line descrip-
 284                                    tion (probably similar to to_longname).  */
 285     /* Per-target scratch pad.  */
 286     void *to_data;
 287     /* The open routine takes the rest of the parameters from the
 288        command, and (if successful) pushes a new target onto the
 289        stack.  Targets should supply this routine, if only to provide
 290        an error message.  */
 291     void (*to_open) (char *, int);
 292     /* Old targets with a static target vector provide "to_close".
 293        New re-entrant targets provide "to_xclose" and that is expected
 294        to xfree everything (including the "struct target_ops").  */
 295     void (*to_xclose) (struct target_ops *targ, int quitting);
 296     void (*to_close) (int);
 297     void (*to_attach) (char *, int);
 298     void (*to_post_attach) (int);
 299     void (*to_detach) (char *, int);
 300     void (*to_disconnect) (char *, int);
 301     void (*to_resume) (ptid_t, int, enum target_signal);
 302     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 303     void (*to_post_wait) (ptid_t, int);
 304     void (*to_fetch_registers) (int);
 305     void (*to_store_registers) (int);
 306     void (*to_prepare_to_store) (void);
 307
 308     /* Transfer LEN bytes of memory between GDB address MYADDR and
 309        target address MEMADDR.  If WRITE, transfer them to the target, else
 310        transfer them from the target.  TARGET is the target from which we
 311        get this function.
 312
 313        Return value, N, is one of the following:
 314
 315        0 means that we can't handle this.  If errno has been set, it is the
 316        error which prevented us from doing it (FIXME: What about bfd_error?).
 317
 318        positive (call it N) means that we have transferred N bytes
 319        starting at MEMADDR.  We might be able to handle more bytes
 320        beyond this length, but no promises.
 321
 322        negative (call its absolute value N) means that we cannot
 323        transfer right at MEMADDR, but we could transfer at least
 324        something at MEMADDR + N.  */
 325
 326     int (*to_xfer_memory) (CORE_ADDR memaddr, char *myaddr,
 327                            int len, int write,
 328                            struct mem_attrib *attrib,
 329                            struct target_ops *target);
 330
 331     void (*to_files_info) (struct target_ops *);
 332     int (*to_insert_breakpoint) (CORE_ADDR, char *);
 333     int (*to_remove_breakpoint) (CORE_ADDR, char *);
 334     int (*to_can_use_hw_breakpoint) (int, int, int);
 335     int (*to_insert_hw_breakpoint) (CORE_ADDR, char *);
 336     int (*to_remove_hw_breakpoint) (CORE_ADDR, char *);
 337     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 338     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 339     int (*to_stopped_by_watchpoint) (void);
 340     int to_have_continuable_watchpoint;
 341     CORE_ADDR (*to_stopped_data_address) (void);
 342     int (*to_region_size_ok_for_hw_watchpoint) (int);
 343     void (*to_terminal_init) (void);
 344     void (*to_terminal_inferior) (void);
 345     void (*to_terminal_ours_for_output) (void);
 346     void (*to_terminal_ours) (void);
 347     void (*to_terminal_save_ours) (void);
 348     void (*to_terminal_info) (char *, int);
 349     void (*to_kill) (void);
 350     void (*to_load) (char *, int);
 351     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 352     void (*to_create_inferior) (char *, char *, char **);
 353     void (*to_post_startup_inferior) (ptid_t);
 354     void (*to_acknowledge_created_inferior) (int);
 355     int (*to_insert_fork_catchpoint) (int);
 356     int (*to_remove_fork_catchpoint) (int);
 357     int (*to_insert_vfork_catchpoint) (int);
 358     int (*to_remove_vfork_catchpoint) (int);
 359     int (*to_follow_fork) (int);
 360     int (*to_insert_exec_catchpoint) (int);
 361     int (*to_remove_exec_catchpoint) (int);
 362     int (*to_reported_exec_events_per_exec_call) (void);
 363     int (*to_has_exited) (int, int, int *);
 364     void (*to_mourn_inferior) (void);
 365     int (*to_can_run) (void);
 366     void (*to_notice_signals) (ptid_t ptid);
 367     int (*to_thread_alive) (ptid_t ptid);
 368     void (*to_find_new_threads) (void);
 369     char *(*to_pid_to_str) (ptid_t);
 370     char *(*to_extra_thread_info) (struct thread_info *);
 371     void (*to_stop) (void);
 372     void (*to_rcmd) (char *command, struct ui_file *output);
 373     struct symtab_and_line *(*to_enable_exception_callback) (enum
 374                                                              exception_event_kind,
 375                                                              int);
 376     struct exception_event_record *(*to_get_current_exception_event) (void);
 377     char *(*to_pid_to_exec_file) (int pid);
 378     enum strata to_stratum;
 379     int to_has_all_memory;
 380     int to_has_memory;
 381     int to_has_stack;
 382     int to_has_registers;
 383     int to_has_execution;
 384     int to_has_thread_control;  /* control thread execution */
 385     struct section_table
 386      *to_sections;
 387     struct section_table
 388      *to_sections_end;
 389     /* ASYNC target controls */
 390     int (*to_can_async_p) (void);
 391     int (*to_is_async_p) (void);
 392     void (*to_async) (void (*cb) (enum inferior_event_type, void *context),
 393                       void *context);
 394     int to_async_mask_value;
 395     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 396                                             unsigned long,
 397                                             int, int, int,
 398                                             void *),
 399                                    void *);
 400     char * (*to_make_corefile_notes) (bfd *, int *);
 401
 402     /* Return the thread-local address at OFFSET in the
 403        thread-local storage for the thread PTID and the shared library
 404        or executable file given by OBJFILE.  If that block of
 405        thread-local storage hasn't been allocated yet, this function
 406        may return an error.  */
 407     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 408                                               struct objfile *objfile,
 409                                               CORE_ADDR offset);
 410
 411     /* Perform partial transfers on OBJECT.  See target_read_partial
 412        and target_write_partial for details of each variant.  One, and
 413        only one, of readbuf or writebuf must be non-NULL.  */
 414     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 415                                 enum target_object object, const char *annex,
 416                                 void *readbuf, const void *writebuf,
 417                                 ULONGEST offset, LONGEST len);
 418
 419     int to_magic;
 420     /* Need sub-structure for target machine related rather than comm related?
 421      */
 422   };
 423
 424 /* Magic number for checking ops size.  If a struct doesn't end with this
 425    number, somebody changed the declaration but didn't change all the
 426    places that initialize one.  */
 427
 428 #define OPS_MAGIC       3840
 429
 430 /* The ops structure for our "current" target process.  This should
 431    never be NULL.  If there is no target, it points to the dummy_target.  */
 432
 433 extern struct target_ops current_target;
 434
 435 /* Define easy words for doing these operations on our current target.  */
 436
 437 #define target_shortname        (current_target.to_shortname)
 438 #define target_longname         (current_target.to_longname)
 439
 440 /* Does whatever cleanup is required for a target that we are no
 441    longer going to be calling.  QUITTING indicates that GDB is exiting
 442    and should not get hung on an error (otherwise it is important to
 443    perform clean termination, even if it takes a while).  This routine
 444    is automatically always called when popping the target off the
 445    target stack (to_beneath is undefined).  Closing file descriptors
 446    and freeing all memory allocated memory are typical things it
 447    should do.  */
 448
 449 void target_close (struct target_ops *targ, int quitting);
 450
 451 /* Attaches to a process on the target side.  Arguments are as passed
 452    to the `attach' command by the user.  This routine can be called
 453    when the target is not on the target-stack, if the target_can_run
 454    routine returns 1; in that case, it must push itself onto the stack.
 455    Upon exit, the target should be ready for normal operations, and
 456    should be ready to deliver the status of the process immediately
 457    (without waiting) to an upcoming target_wait call.  */
 458
 459 #define target_attach(args, from_tty)   \
 460      (*current_target.to_attach) (args, from_tty)
 461
 462 /* The target_attach operation places a process under debugger control,
 463    and stops the process.
 464
 465    This operation provides a target-specific hook that allows the
 466    necessary bookkeeping to be performed after an attach completes.  */
 467 #define target_post_attach(pid) \
 468      (*current_target.to_post_attach) (pid)
 469
 470 /* Takes a program previously attached to and detaches it.
 471    The program may resume execution (some targets do, some don't) and will
 472    no longer stop on signals, etc.  We better not have left any breakpoints
 473    in the program or it'll die when it hits one.  ARGS is arguments
 474    typed by the user (e.g. a signal to send the process).  FROM_TTY
 475    says whether to be verbose or not.  */
 476
 477 extern void target_detach (char *, int);
 478
 479 /* Disconnect from the current target without resuming it (leaving it
 480    waiting for a debugger).  */
 481
 482 extern void target_disconnect (char *, int);
 483
 484 /* Resume execution of the target process PTID.  STEP says whether to
 485    single-step or to run free; SIGGNAL is the signal to be given to
 486    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 487    pass TARGET_SIGNAL_DEFAULT.  */
 488
 489 #define target_resume(ptid, step, siggnal)                              \
 490   do {                                                                  \
 491     dcache_invalidate(target_dcache);                                   \
 492     (*current_target.to_resume) (ptid, step, siggnal);                  \
 493   } while (0)
 494
 495 /* Wait for process pid to do something.  PTID = -1 to wait for any
 496    pid to do something.  Return pid of child, or -1 in case of error;
 497    store status through argument pointer STATUS.  Note that it is
 498    _NOT_ OK to throw_exception() out of target_wait() without popping
 499    the debugging target from the stack; GDB isn't prepared to get back
 500    to the prompt with a debugging target but without the frame cache,
 501    stop_pc, etc., set up.  */
 502
 503 #define target_wait(ptid, status)               \
 504      (*current_target.to_wait) (ptid, status)
 505
 506 /* The target_wait operation waits for a process event to occur, and
 507    thereby stop the process.
 508
 509    On some targets, certain events may happen in sequences.  gdb's
 510    correct response to any single event of such a sequence may require
 511    knowledge of what earlier events in the sequence have been seen.
 512
 513    This operation provides a target-specific hook that allows the
 514    necessary bookkeeping to be performed to track such sequences.  */
 515
 516 #define target_post_wait(ptid, status) \
 517      (*current_target.to_post_wait) (ptid, status)
 518
 519 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 520
 521 #define target_fetch_registers(regno)   \
 522      (*current_target.to_fetch_registers) (regno)
 523
 524 /* Store at least register REGNO, or all regs if REGNO == -1.
 525    It can store as many registers as it wants to, so target_prepare_to_store
 526    must have been previously called.  Calls error() if there are problems.  */
 527
 528 #define target_store_registers(regs)    \
 529      (*current_target.to_store_registers) (regs)
 530
 531 /* Get ready to modify the registers array.  On machines which store
 532    individual registers, this doesn't need to do anything.  On machines
 533    which store all the registers in one fell swoop, this makes sure
 534    that REGISTERS contains all the registers from the program being
 535    debugged.  */
 536
 537 #define target_prepare_to_store()       \
 538      (*current_target.to_prepare_to_store) ()
 539
 540 extern DCACHE *target_dcache;
 541
 542 extern int do_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
 543                            struct mem_attrib *attrib);
 544
 545 extern int target_read_string (CORE_ADDR, char **, int, int *);
 546
 547 extern int target_read_memory (CORE_ADDR memaddr, char *myaddr, int len);
 548
 549 extern int target_write_memory (CORE_ADDR memaddr, char *myaddr, int len);
 550
 551 extern int xfer_memory (CORE_ADDR, char *, int, int,
 552                         struct mem_attrib *, struct target_ops *);
 553
 554 extern int child_xfer_memory (CORE_ADDR, char *, int, int,
 555                               struct mem_attrib *, struct target_ops *);
 556
 557 /* Make a single attempt at transfering LEN bytes.  On a successful
 558    transfer, the number of bytes actually transfered is returned and
 559    ERR is set to 0.  When a transfer fails, -1 is returned (the number
 560    of bytes actually transfered is not defined) and ERR is set to a
 561    non-zero error indication.  */
 562
 563 extern int target_read_memory_partial (CORE_ADDR addr, char *buf, int len,
 564                                        int *err);
 565
 566 extern int target_write_memory_partial (CORE_ADDR addr, char *buf, int len,
 567                                         int *err);
 568
 569 extern char *child_pid_to_exec_file (int);
 570
 571 extern char *child_core_file_to_sym_file (char *);
 572
 573 #if defined(CHILD_POST_ATTACH)
 574 extern void child_post_attach (int);
 575 #endif
 576
 577 extern void child_post_wait (ptid_t, int);
 578
 579 extern void child_post_startup_inferior (ptid_t);
 580
 581 extern void child_acknowledge_created_inferior (int);
 582
 583 extern int child_insert_fork_catchpoint (int);
 584
 585 extern int child_remove_fork_catchpoint (int);
 586
 587 extern int child_insert_vfork_catchpoint (int);
 588
 589 extern int child_remove_vfork_catchpoint (int);
 590
 591 extern void child_acknowledge_created_inferior (int);
 592
 593 extern int child_follow_fork (int);
 594
 595 extern int child_insert_exec_catchpoint (int);
 596
 597 extern int child_remove_exec_catchpoint (int);
 598
 599 extern int child_reported_exec_events_per_exec_call (void);
 600
 601 extern int child_has_exited (int, int, int *);
 602
 603 extern int child_thread_alive (ptid_t);
 604
 605 /* From infrun.c.  */
 606
 607 extern int inferior_has_forked (int pid, int *child_pid);
 608
 609 extern int inferior_has_vforked (int pid, int *child_pid);
 610
 611 extern int inferior_has_execd (int pid, char **execd_pathname);
 612
 613 /* From exec.c */
 614
 615 extern void print_section_info (struct target_ops *, bfd *);
 616
 617 /* Print a line about the current target.  */
 618
 619 #define target_files_info()     \
 620      (*current_target.to_files_info) (&current_target)
 621
 622 /* Insert a breakpoint at address ADDR in the target machine.  SAVE is
 623    a pointer to memory allocated for saving the target contents.  It
 624    is guaranteed by the caller to be long enough to save the number of
 625    breakpoint bytes indicated by BREAKPOINT_FROM_PC.  Result is 0 for
 626    success, or an errno value.  */
 627
 628 #define target_insert_breakpoint(addr, save)    \
 629      (*current_target.to_insert_breakpoint) (addr, save)
 630
 631 /* Remove a breakpoint at address ADDR in the target machine.
 632    SAVE is a pointer to the same save area
 633    that was previously passed to target_insert_breakpoint.
 634    Result is 0 for success, or an errno value.  */
 635
 636 #define target_remove_breakpoint(addr, save)    \
 637      (*current_target.to_remove_breakpoint) (addr, save)
 638
 639 /* Initialize the terminal settings we record for the inferior,
 640    before we actually run the inferior.  */
 641
 642 #define target_terminal_init() \
 643      (*current_target.to_terminal_init) ()
 644
 645 /* Put the inferior's terminal settings into effect.
 646    This is preparation for starting or resuming the inferior.  */
 647
 648 #define target_terminal_inferior() \
 649      (*current_target.to_terminal_inferior) ()
 650
 651 /* Put some of our terminal settings into effect,
 652    enough to get proper results from our output,
 653    but do not change into or out of RAW mode
 654    so that no input is discarded.
 655
 656    After doing this, either terminal_ours or terminal_inferior
 657    should be called to get back to a normal state of affairs.  */
 658
 659 #define target_terminal_ours_for_output() \
 660      (*current_target.to_terminal_ours_for_output) ()
 661
 662 /* Put our terminal settings into effect.
 663    First record the inferior's terminal settings
 664    so they can be restored properly later.  */
 665
 666 #define target_terminal_ours() \
 667      (*current_target.to_terminal_ours) ()
 668
 669 /* Save our terminal settings.
 670    This is called from TUI after entering or leaving the curses
 671    mode.  Since curses modifies our terminal this call is here
 672    to take this change into account.  */
 673
 674 #define target_terminal_save_ours() \
 675      (*current_target.to_terminal_save_ours) ()
 676
 677 /* Print useful information about our terminal status, if such a thing
 678    exists.  */
 679
 680 #define target_terminal_info(arg, from_tty) \
 681      (*current_target.to_terminal_info) (arg, from_tty)
 682
 683 /* Kill the inferior process.   Make it go away.  */
 684
 685 #define target_kill() \
 686      (*current_target.to_kill) ()
 687
 688 /* Load an executable file into the target process.  This is expected
 689    to not only bring new code into the target process, but also to
 690    update GDB's symbol tables to match.  */
 691
 692 extern void target_load (char *arg, int from_tty);
 693
 694 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 695    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 696    symbol should be returned.  The result is 0 if successful, nonzero
 697    if the symbol does not exist in the target environment.  This
 698    function should not call error() if communication with the target
 699    is interrupted, since it is called from symbol reading, but should
 700    return nonzero, possibly doing a complain().  */
 701
 702 #define target_lookup_symbol(name, addrp) \
 703      (*current_target.to_lookup_symbol) (name, addrp)
 704
 705 /* Start an inferior process and set inferior_ptid to its pid.
 706    EXEC_FILE is the file to run.
 707    ALLARGS is a string containing the arguments to the program.
 708    ENV is the environment vector to pass.  Errors reported with error().
 709    On VxWorks and various standalone systems, we ignore exec_file.  */
 710
 711 #define target_create_inferior(exec_file, args, env)    \
 712      (*current_target.to_create_inferior) (exec_file, args, env)
 713
 714
 715 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 716    notification of inferior events such as fork and vork immediately
 717    after the inferior is created.  (This because of how gdb gets an
 718    inferior created via invoking a shell to do it.  In such a scenario,
 719    if the shell init file has commands in it, the shell will fork and
 720    exec for each of those commands, and we will see each such fork
 721    event.  Very bad.)
 722
 723    Such targets will supply an appropriate definition for this function.  */
 724
 725 #define target_post_startup_inferior(ptid) \
 726      (*current_target.to_post_startup_inferior) (ptid)
 727
 728 /* On some targets, the sequence of starting up an inferior requires
 729    some synchronization between gdb and the new inferior process, PID.  */
 730
 731 #define target_acknowledge_created_inferior(pid) \
 732      (*current_target.to_acknowledge_created_inferior) (pid)
 733
 734 /* On some targets, we can catch an inferior fork or vfork event when
 735    it occurs.  These functions insert/remove an already-created
 736    catchpoint for such events.  */
 737
 738 #define target_insert_fork_catchpoint(pid) \
 739      (*current_target.to_insert_fork_catchpoint) (pid)
 740
 741 #define target_remove_fork_catchpoint(pid) \
 742      (*current_target.to_remove_fork_catchpoint) (pid)
 743
 744 #define target_insert_vfork_catchpoint(pid) \
 745      (*current_target.to_insert_vfork_catchpoint) (pid)
 746
 747 #define target_remove_vfork_catchpoint(pid) \
 748      (*current_target.to_remove_vfork_catchpoint) (pid)
 749
 750 /* If the inferior forks or vforks, this function will be called at
 751    the next resume in order to perform any bookkeeping and fiddling
 752    necessary to continue debugging either the parent or child, as
 753    requested, and releasing the other.  Information about the fork
 754    or vfork event is available via get_last_target_status ().
 755    This function returns 1 if the inferior should not be resumed
 756    (i.e. there is another event pending).  */
 757
 758 #define target_follow_fork(follow_child) \
 759      (*current_target.to_follow_fork) (follow_child)
 760
 761 /* On some targets, we can catch an inferior exec event when it
 762    occurs.  These functions insert/remove an already-created
 763    catchpoint for such events.  */
 764
 765 #define target_insert_exec_catchpoint(pid) \
 766      (*current_target.to_insert_exec_catchpoint) (pid)
 767
 768 #define target_remove_exec_catchpoint(pid) \
 769      (*current_target.to_remove_exec_catchpoint) (pid)
 770
 771 /* Returns the number of exec events that are reported when a process
 772    invokes a flavor of the exec() system call on this target, if exec
 773    events are being reported.  */
 774
 775 #define target_reported_exec_events_per_exec_call() \
 776      (*current_target.to_reported_exec_events_per_exec_call) ()
 777
 778 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 779    exit code of PID, if any.  */
 780
 781 #define target_has_exited(pid,wait_status,exit_status) \
 782      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 783
 784 /* The debugger has completed a blocking wait() call.  There is now
 785    some process event that must be processed.  This function should
 786    be defined by those targets that require the debugger to perform
 787    cleanup or internal state changes in response to the process event.  */
 788
 789 /* The inferior process has died.  Do what is right.  */
 790
 791 #define target_mourn_inferior() \
 792      (*current_target.to_mourn_inferior) ()
 793
 794 /* Does target have enough data to do a run or attach command? */
 795
 796 #define target_can_run(t) \
 797      ((t)->to_can_run) ()
 798
 799 /* post process changes to signal handling in the inferior.  */
 800
 801 #define target_notice_signals(ptid) \
 802      (*current_target.to_notice_signals) (ptid)
 803
 804 /* Check to see if a thread is still alive.  */
 805
 806 #define target_thread_alive(ptid) \
 807      (*current_target.to_thread_alive) (ptid)
 808
 809 /* Query for new threads and add them to the thread list.  */
 810
 811 #define target_find_new_threads() \
 812      (*current_target.to_find_new_threads) (); \
 813
 814 /* Make target stop in a continuable fashion.  (For instance, under
 815    Unix, this should act like SIGSTOP).  This function is normally
 816    used by GUIs to implement a stop button.  */
 817
 818 #define target_stop current_target.to_stop
 819
 820 /* Send the specified COMMAND to the target's monitor
 821    (shell,interpreter) for execution.  The result of the query is
 822    placed in OUTBUF.  */
 823
 824 #define target_rcmd(command, outbuf) \
 825      (*current_target.to_rcmd) (command, outbuf)
 826
 827
 828 /* Get the symbol information for a breakpointable routine called when
 829    an exception event occurs.
 830    Intended mainly for C++, and for those
 831    platforms/implementations where such a callback mechanism is available,
 832    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 833    different mechanisms for debugging exceptions.  */
 834
 835 #define target_enable_exception_callback(kind, enable) \
 836      (*current_target.to_enable_exception_callback) (kind, enable)
 837
 838 /* Get the current exception event kind -- throw or catch, etc.  */
 839
 840 #define target_get_current_exception_event() \
 841      (*current_target.to_get_current_exception_event) ()
 842
 843 /* Does the target include all of memory, or only part of it?  This
 844    determines whether we look up the target chain for other parts of
 845    memory if this target can't satisfy a request.  */
 846
 847 #define target_has_all_memory   \
 848      (current_target.to_has_all_memory)
 849
 850 /* Does the target include memory?  (Dummy targets don't.)  */
 851
 852 #define target_has_memory       \
 853      (current_target.to_has_memory)
 854
 855 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 856    we start a process.)  */
 857
 858 #define target_has_stack        \
 859      (current_target.to_has_stack)
 860
 861 /* Does the target have registers?  (Exec files don't.)  */
 862
 863 #define target_has_registers    \
 864      (current_target.to_has_registers)
 865
 866 /* Does the target have execution?  Can we make it jump (through
 867    hoops), or pop its stack a few times?  FIXME: If this is to work that
 868    way, it needs to check whether an inferior actually exists.
 869    remote-udi.c and probably other targets can be the current target
 870    when the inferior doesn't actually exist at the moment.  Right now
 871    this just tells us whether this target is *capable* of execution.  */
 872
 873 #define target_has_execution    \
 874      (current_target.to_has_execution)
 875
 876 /* Can the target support the debugger control of thread execution?
 877    a) Can it lock the thread scheduler?
 878    b) Can it switch the currently running thread?  */
 879
 880 #define target_can_lock_scheduler \
 881      (current_target.to_has_thread_control & tc_schedlock)
 882
 883 #define target_can_switch_threads \
 884      (current_target.to_has_thread_control & tc_switch)
 885
 886 /* Can the target support asynchronous execution? */
 887 #define target_can_async_p() (current_target.to_can_async_p ())
 888
 889 /* Is the target in asynchronous execution mode? */
 890 #define target_is_async_p() (current_target.to_is_async_p())
 891
 892 /* Put the target in async mode with the specified callback function. */
 893 #define target_async(CALLBACK,CONTEXT) \
 894      (current_target.to_async((CALLBACK), (CONTEXT)))
 895
 896 /* This is to be used ONLY within call_function_by_hand(). It provides
 897    a workaround, to have inferior function calls done in sychronous
 898    mode, even though the target is asynchronous. After
 899    target_async_mask(0) is called, calls to target_can_async_p() will
 900    return FALSE , so that target_resume() will not try to start the
 901    target asynchronously. After the inferior stops, we IMMEDIATELY
 902    restore the previous nature of the target, by calling
 903    target_async_mask(1). After that, target_can_async_p() will return
 904    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 905
 906    FIXME ezannoni 1999-12-13: we won't need this once we move
 907    the turning async on and off to the single execution commands,
 908    from where it is done currently, in remote_resume().  */
 909
 910 #define target_async_mask_value \
 911      (current_target.to_async_mask_value)
 912
 913 extern int target_async_mask (int mask);
 914
 915 extern void target_link (char *, CORE_ADDR *);
 916
 917 /* Converts a process id to a string.  Usually, the string just contains
 918    `process xyz', but on some systems it may contain
 919    `process xyz thread abc'.  */
 920
 921 #undef target_pid_to_str
 922 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
 923
 924 #ifndef target_tid_to_str
 925 #define target_tid_to_str(PID) \
 926      target_pid_to_str (PID)
 927 extern char *normal_pid_to_str (ptid_t ptid);
 928 #endif
 929
 930 /* Return a short string describing extra information about PID,
 931    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
 932    is okay.  */
 933
 934 #define target_extra_thread_info(TP) \
 935      (current_target.to_extra_thread_info (TP))
 936
 937 /*
 938  * New Objfile Event Hook:
 939  *
 940  * Sometimes a GDB component wants to get notified whenever a new
 941  * objfile is loaded.  Mainly this is used by thread-debugging
 942  * implementations that need to know when symbols for the target
 943  * thread implemenation are available.
 944  *
 945  * The old way of doing this is to define a macro 'target_new_objfile'
 946  * that points to the function that you want to be called on every
 947  * objfile/shlib load.
 948  *
 949  * The new way is to grab the function pointer, 'target_new_objfile_hook',
 950  * and point it to the function that you want to be called on every
 951  * objfile/shlib load.
 952  *
 953  * If multiple clients are willing to be cooperative, they can each
 954  * save a pointer to the previous value of target_new_objfile_hook
 955  * before modifying it, and arrange for their function to call the
 956  * previous function in the chain.  In that way, multiple clients
 957  * can receive this notification (something like with signal handlers).
 958  */
 959
 960 extern void (*target_new_objfile_hook) (struct objfile *);
 961
 962 #ifndef target_pid_or_tid_to_str
 963 #define target_pid_or_tid_to_str(ID) \
 964      target_pid_to_str (ID)
 965 #endif
 966
 967 /* Attempts to find the pathname of the executable file
 968    that was run to create a specified process.
 969
 970    The process PID must be stopped when this operation is used.
 971
 972    If the executable file cannot be determined, NULL is returned.
 973
 974    Else, a pointer to a character string containing the pathname
 975    is returned.  This string should be copied into a buffer by
 976    the client if the string will not be immediately used, or if
 977    it must persist.  */
 978
 979 #define target_pid_to_exec_file(pid) \
 980      (current_target.to_pid_to_exec_file) (pid)
 981
 982 /*
 983  * Iterator function for target memory regions.
 984  * Calls a callback function once for each memory region 'mapped'
 985  * in the child process.  Defined as a simple macro rather than
 986  * as a function macro so that it can be tested for nullity.
 987  */
 988
 989 #define target_find_memory_regions(FUNC, DATA) \
 990      (current_target.to_find_memory_regions) (FUNC, DATA)
 991
 992 /*
 993  * Compose corefile .note section.
 994  */
 995
 996 #define target_make_corefile_notes(BFD, SIZE_P) \
 997      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
 998
 999 /* Thread-local values.  */
1000 #define target_get_thread_local_address \
1001     (current_target.to_get_thread_local_address)
1002 #define target_get_thread_local_address_p() \
1003     (target_get_thread_local_address != NULL)
1004
1005 /* Hook to call target dependent code just after inferior target process has
1006    started.  */
1007
1008 #ifndef TARGET_CREATE_INFERIOR_HOOK
1009 #define TARGET_CREATE_INFERIOR_HOOK(PID)
1010 #endif
1011
1012 /* Hardware watchpoint interfaces.  */
1013
1014 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1015    write).  */
1016
1017 #ifndef STOPPED_BY_WATCHPOINT
1018 #define STOPPED_BY_WATCHPOINT(w) \
1019    (*current_target.to_stopped_by_watchpoint) ()
1020 #endif
1021
1022 /* Non-zero if we have continuable watchpoints  */
1023
1024 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1025 #define HAVE_CONTINUABLE_WATCHPOINT \
1026    (current_target.to_have_continuable_watchpoint)
1027 #endif
1028
1029 /* HP-UX supplies these operations, which respectively disable and enable
1030    the memory page-protections that are used to implement hardware watchpoints
1031    on that platform.  See wait_for_inferior's use of these.  */
1032
1033 #if !defined(TARGET_DISABLE_HW_WATCHPOINTS)
1034 #define TARGET_DISABLE_HW_WATCHPOINTS(pid)
1035 #endif
1036
1037 #if !defined(TARGET_ENABLE_HW_WATCHPOINTS)
1038 #define TARGET_ENABLE_HW_WATCHPOINTS(pid)
1039 #endif
1040
1041 /* Provide defaults for hardware watchpoint functions.  */
1042
1043 /* If the *_hw_beakpoint functions have not been defined
1044    elsewhere use the definitions in the target vector.  */
1045
1046 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1047    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1048    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1049    (including this one?).  OTHERTYPE is who knows what...  */
1050
1051 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1052 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1053  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1054 #endif
1055
1056 #if !defined(TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT)
1057 #define TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT(byte_count) \
1058     (*current_target.to_region_size_ok_for_hw_watchpoint) (byte_count)
1059 #endif
1060
1061
1062 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1063    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1064    success, non-zero for failure.  */
1065
1066 #ifndef target_insert_watchpoint
1067 #define target_insert_watchpoint(addr, len, type)       \
1068      (*current_target.to_insert_watchpoint) (addr, len, type)
1069
1070 #define target_remove_watchpoint(addr, len, type)       \
1071      (*current_target.to_remove_watchpoint) (addr, len, type)
1072 #endif
1073
1074 #ifndef target_insert_hw_breakpoint
1075 #define target_insert_hw_breakpoint(addr, save) \
1076      (*current_target.to_insert_hw_breakpoint) (addr, save)
1077
1078 #define target_remove_hw_breakpoint(addr, save) \
1079      (*current_target.to_remove_hw_breakpoint) (addr, save)
1080 #endif
1081
1082 #ifndef target_stopped_data_address
1083 #define target_stopped_data_address() \
1084     (*current_target.to_stopped_data_address) ()
1085 #endif
1086
1087 /* If defined, then we need to decr pc by this much after a hardware break-
1088    point.  Presumably this overrides DECR_PC_AFTER_BREAK...  */
1089
1090 #ifndef DECR_PC_AFTER_HW_BREAK
1091 #define DECR_PC_AFTER_HW_BREAK 0
1092 #endif
1093
1094 /* Sometimes gdb may pick up what appears to be a valid target address
1095    from a minimal symbol, but the value really means, essentially,
1096    "This is an index into a table which is populated when the inferior
1097    is run.  Therefore, do not attempt to use this as a PC."  */
1098
1099 #if !defined(PC_REQUIRES_RUN_BEFORE_USE)
1100 #define PC_REQUIRES_RUN_BEFORE_USE(pc) (0)
1101 #endif
1102
1103 /* This will only be defined by a target that supports catching vfork events,
1104    such as HP-UX.
1105
1106    On some targets (such as HP-UX 10.20 and earlier), resuming a newly vforked
1107    child process after it has exec'd, causes the parent process to resume as
1108    well.  To prevent the parent from running spontaneously, such targets should
1109    define this to a function that prevents that from happening.  */
1110 #if !defined(ENSURE_VFORKING_PARENT_REMAINS_STOPPED)
1111 #define ENSURE_VFORKING_PARENT_REMAINS_STOPPED(PID) (0)
1112 #endif
1113
1114 /* This will only be defined by a target that supports catching vfork events,
1115    such as HP-UX.
1116
1117    On some targets (such as HP-UX 10.20 and earlier), a newly vforked child
1118    process must be resumed when it delivers its exec event, before the parent
1119    vfork event will be delivered to us.  */
1120
1121 #if !defined(RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK)
1122 #define RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK() (0)
1123 #endif
1124
1125 /* Routines for maintenance of the target structures...
1126
1127    add_target:   Add a target to the list of all possible targets.
1128
1129    push_target:  Make this target the top of the stack of currently used
1130    targets, within its particular stratum of the stack.  Result
1131    is 0 if now atop the stack, nonzero if not on top (maybe
1132    should warn user).
1133
1134    unpush_target: Remove this from the stack of currently used targets,
1135    no matter where it is on the list.  Returns 0 if no
1136    change, 1 if removed from stack.
1137
1138    pop_target:   Remove the top thing on the stack of current targets.  */
1139
1140 extern void add_target (struct target_ops *);
1141
1142 extern int push_target (struct target_ops *);
1143
1144 extern int unpush_target (struct target_ops *);
1145
1146 extern void target_preopen (int);
1147
1148 extern void pop_target (void);
1149
1150 /* Struct section_table maps address ranges to file sections.  It is
1151    mostly used with BFD files, but can be used without (e.g. for handling
1152    raw disks, or files not in formats handled by BFD).  */
1153
1154 struct section_table
1155   {
1156     CORE_ADDR addr;             /* Lowest address in section */
1157     CORE_ADDR endaddr;          /* 1+highest address in section */
1158
1159     struct bfd_section *the_bfd_section;
1160
1161     bfd *bfd;                   /* BFD file pointer */
1162   };
1163
1164 /* Return the "section" containing the specified address.  */
1165 struct section_table *target_section_by_addr (struct target_ops *target,
1166                                               CORE_ADDR addr);
1167
1168
1169 /* From mem-break.c */
1170
1171 extern int memory_remove_breakpoint (CORE_ADDR, char *);
1172
1173 extern int memory_insert_breakpoint (CORE_ADDR, char *);
1174
1175 extern int default_memory_remove_breakpoint (CORE_ADDR, char *);
1176
1177 extern int default_memory_insert_breakpoint (CORE_ADDR, char *);
1178
1179
1180 /* From target.c */
1181
1182 extern void initialize_targets (void);
1183
1184 extern void noprocess (void);
1185
1186 extern void find_default_attach (char *, int);
1187
1188 extern void find_default_create_inferior (char *, char *, char **);
1189
1190 extern struct target_ops *find_run_target (void);
1191
1192 extern struct target_ops *find_core_target (void);
1193
1194 extern struct target_ops *find_target_beneath (struct target_ops *);
1195
1196 extern int target_resize_to_sections (struct target_ops *target,
1197                                       int num_added);
1198
1199 extern void remove_target_sections (bfd *abfd);
1200
1201 \f
1202 /* Stuff that should be shared among the various remote targets.  */
1203
1204 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1205    information (higher values, more information).  */
1206 extern int remote_debug;
1207
1208 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1209 extern int baud_rate;
1210 /* Timeout limit for response from target. */
1211 extern int remote_timeout;
1212
1213 \f
1214 /* Functions for helping to write a native target.  */
1215
1216 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1217 extern void store_waitstatus (struct target_waitstatus *, int);
1218
1219 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1220    targ_signal SIGNO has an equivalent ``host'' representation.  */
1221 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1222    to the shorter target_signal_p() because it is far less ambigious.
1223    In this context ``target_signal'' refers to GDB's internal
1224    representation of the target's set of signals while ``host signal''
1225    refers to the target operating system's signal.  Confused?  */
1226
1227 extern int target_signal_to_host_p (enum target_signal signo);
1228
1229 /* Convert between host signal numbers and enum target_signal's.
1230    target_signal_to_host() returns 0 and prints a warning() on GDB's
1231    console if SIGNO has no equivalent host representation.  */
1232 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1233    refering to the target operating system's signal numbering.
1234    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1235    gdb_signal'' would probably be better as it is refering to GDB's
1236    internal representation of a target operating system's signal.  */
1237
1238 extern enum target_signal target_signal_from_host (int);
1239 extern int target_signal_to_host (enum target_signal);
1240
1241 /* Convert from a number used in a GDB command to an enum target_signal.  */
1242 extern enum target_signal target_signal_from_command (int);
1243
1244 /* Any target can call this to switch to remote protocol (in remote.c). */
1245 extern void push_remote_target (char *name, int from_tty);
1246 \f
1247 /* Imported from machine dependent code */
1248
1249 /* Blank target vector entries are initialized to target_ignore. */
1250 void target_ignore (void);
1251
1252 #endif /* !defined (TARGET_H) */