gdb/target.h

   1 /* Interface between GDB and target environments, including files and processes
   2
   3    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   4    1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
   5    Free Software Foundation, Inc.
   6
   7    Contributed by Cygnus Support.  Written by John Gilmore.
   8
   9    This file is part of GDB.
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24    Boston, MA 02110-1301, USA.  */
  25
  26 #if !defined (TARGET_H)
  27 #define TARGET_H
  28
  29 struct objfile;
  30 struct ui_file;
  31 struct mem_attrib;
  32 struct target_ops;
  33 struct bp_target_info;
  34
  35 /* This include file defines the interface between the main part
  36    of the debugger, and the part which is target-specific, or
  37    specific to the communications interface between us and the
  38    target.
  39
  40    A TARGET is an interface between the debugger and a particular
  41    kind of file or process.  Targets can be STACKED in STRATA,
  42    so that more than one target can potentially respond to a request.
  43    In particular, memory accesses will walk down the stack of targets
  44    until they find a target that is interested in handling that particular
  45    address.  STRATA are artificial boundaries on the stack, within
  46    which particular kinds of targets live.  Strata exist so that
  47    people don't get confused by pushing e.g. a process target and then
  48    a file target, and wondering why they can't see the current values
  49    of variables any more (the file target is handling them and they
  50    never get to the process target).  So when you push a file target,
  51    it goes into the file stratum, which is always below the process
  52    stratum.  */
  53
  54 #include "bfd.h"
  55 #include "symtab.h"
  56 #include "dcache.h"
  57 #include "memattr.h"
  58
  59 enum strata
  60   {
  61     dummy_stratum,              /* The lowest of the low */
  62     file_stratum,               /* Executable files, etc */
  63     core_stratum,               /* Core dump files */
  64     download_stratum,           /* Downloading of remote targets */
  65     process_stratum,            /* Executing processes */
  66     thread_stratum              /* Executing threads */
  67   };
  68
  69 enum thread_control_capabilities
  70   {
  71     tc_none = 0,                /* Default: can't control thread execution.  */
  72     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  73     tc_switch = 2               /* Can switch the running thread on demand.  */
  74   };
  75
  76 /* Stuff for target_wait.  */
  77
  78 /* Generally, what has the program done?  */
  79 enum target_waitkind
  80   {
  81     /* The program has exited.  The exit status is in value.integer.  */
  82     TARGET_WAITKIND_EXITED,
  83
  84     /* The program has stopped with a signal.  Which signal is in
  85        value.sig.  */
  86     TARGET_WAITKIND_STOPPED,
  87
  88     /* The program has terminated with a signal.  Which signal is in
  89        value.sig.  */
  90     TARGET_WAITKIND_SIGNALLED,
  91
  92     /* The program is letting us know that it dynamically loaded something
  93        (e.g. it called load(2) on AIX).  */
  94     TARGET_WAITKIND_LOADED,
  95
  96     /* The program has forked.  A "related" process' ID is in
  97        value.related_pid.  I.e., if the child forks, value.related_pid
  98        is the parent's ID.  */
  99
 100     TARGET_WAITKIND_FORKED,
 101
 102     /* The program has vforked.  A "related" process's ID is in
 103        value.related_pid.  */
 104
 105     TARGET_WAITKIND_VFORKED,
 106
 107     /* The program has exec'ed a new executable file.  The new file's
 108        pathname is pointed to by value.execd_pathname.  */
 109
 110     TARGET_WAITKIND_EXECD,
 111
 112     /* The program has entered or returned from a system call.  On
 113        HP-UX, this is used in the hardware watchpoint implementation.
 114        The syscall's unique integer ID number is in value.syscall_id */
 115
 116     TARGET_WAITKIND_SYSCALL_ENTRY,
 117     TARGET_WAITKIND_SYSCALL_RETURN,
 118
 119     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 120        within target_wait, but I'm not sure target_wait should be resuming the
 121        inferior.  */
 122     TARGET_WAITKIND_SPURIOUS,
 123
 124     /* An event has occured, but we should wait again.
 125        Remote_async_wait() returns this when there is an event
 126        on the inferior, but the rest of the world is not interested in
 127        it. The inferior has not stopped, but has just sent some output
 128        to the console, for instance. In this case, we want to go back
 129        to the event loop and wait there for another event from the
 130        inferior, rather than being stuck in the remote_async_wait()
 131        function. This way the event loop is responsive to other events,
 132        like for instance the user typing.  */
 133     TARGET_WAITKIND_IGNORE
 134   };
 135
 136 struct target_waitstatus
 137   {
 138     enum target_waitkind kind;
 139
 140     /* Forked child pid, execd pathname, exit status or signal number.  */
 141     union
 142       {
 143         int integer;
 144         enum target_signal sig;
 145         int related_pid;
 146         char *execd_pathname;
 147         int syscall_id;
 148       }
 149     value;
 150   };
 151
 152 /* Possible types of events that the inferior handler will have to
 153    deal with.  */
 154 enum inferior_event_type
 155   {
 156     /* There is a request to quit the inferior, abandon it.  */
 157     INF_QUIT_REQ,
 158     /* Process a normal inferior event which will result in target_wait
 159        being called.  */
 160     INF_REG_EVENT,
 161     /* Deal with an error on the inferior.  */
 162     INF_ERROR,
 163     /* We are called because a timer went off.  */
 164     INF_TIMER,
 165     /* We are called to do stuff after the inferior stops.  */
 166     INF_EXEC_COMPLETE,
 167     /* We are called to do some stuff after the inferior stops, but we
 168        are expected to reenter the proceed() and
 169        handle_inferior_event() functions. This is used only in case of
 170        'step n' like commands.  */
 171     INF_EXEC_CONTINUE
 172   };
 173
 174 /* Return the string for a signal.  */
 175 extern char *target_signal_to_string (enum target_signal);
 176
 177 /* Return the name (SIGHUP, etc.) for a signal.  */
 178 extern char *target_signal_to_name (enum target_signal);
 179
 180 /* Given a name (SIGHUP, etc.), return its signal.  */
 181 enum target_signal target_signal_from_name (char *);
 182 \f
 183 /* Request the transfer of up to LEN 8-bit bytes of the target's
 184    OBJECT.  The OFFSET, for a seekable object, specifies the starting
 185    point.  The ANNEX can be used to provide additional data-specific
 186    information to the target.
 187
 188    Return the number of bytes actually transfered, zero when no
 189    further transfer is possible, and -1 when the transfer is not
 190    supported.
 191
 192    NOTE: cagney/2003-10-17: The current interface does not support a
 193    "retry" mechanism.  Instead it assumes that at least one byte will
 194    be transfered on each call.
 195
 196    NOTE: cagney/2003-10-17: The current interface can lead to
 197    fragmented transfers.  Lower target levels should not implement
 198    hacks, such as enlarging the transfer, in an attempt to compensate
 199    for this.  Instead, the target stack should be extended so that it
 200    implements supply/collect methods and a look-aside object cache.
 201    With that available, the lowest target can safely and freely "push"
 202    data up the stack.
 203
 204    NOTE: cagney/2003-10-17: Unlike the old query and the memory
 205    transfer mechanisms, these methods are explicitly parameterized by
 206    the target that it should be applied to.
 207
 208    NOTE: cagney/2003-10-17: Just like the old query and memory xfer
 209    methods, these new methods perform partial transfers.  The only
 210    difference is that these new methods thought to include "partial"
 211    in the name.  The old code's failure to do this lead to much
 212    confusion and duplication of effort as each target object attempted
 213    to locally take responsibility for something it didn't have to
 214    worry about.
 215
 216    NOTE: cagney/2003-10-17: With a TARGET_OBJECT_KOD object, for
 217    backward compatibility with the "target_query" method that this
 218    replaced, when OFFSET and LEN are both zero, return the "minimum"
 219    buffer size.  See "remote.c" for further information.  */
 220
 221 enum target_object
 222 {
 223   /* Kernel Object Display transfer.  See "kod.c" and "remote.c".  */
 224   TARGET_OBJECT_KOD,
 225   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 226   TARGET_OBJECT_AVR,
 227   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 228   TARGET_OBJECT_MEMORY,
 229   /* Kernel Unwind Table.  See "ia64-tdep.c".  */
 230   TARGET_OBJECT_UNWIND_TABLE,
 231   /* Transfer auxilliary vector.  */
 232   TARGET_OBJECT_AUXV,
 233   /* StackGhost cookie.  See "sparc-tdep.c".  */
 234   TARGET_OBJECT_WCOOKIE
 235
 236   /* Possible future objects: TARGET_OBJECT_FILE, TARGET_OBJECT_PROC, ... */
 237 };
 238
 239 extern LONGEST target_read_partial (struct target_ops *ops,
 240                                     enum target_object object,
 241                                     const char *annex, gdb_byte *buf,
 242                                     ULONGEST offset, LONGEST len);
 243
 244 extern LONGEST target_write_partial (struct target_ops *ops,
 245                                      enum target_object object,
 246                                      const char *annex, const gdb_byte *buf,
 247                                      ULONGEST offset, LONGEST len);
 248
 249 /* Wrappers to perform the full transfer.  */
 250 extern LONGEST target_read (struct target_ops *ops,
 251                             enum target_object object,
 252                             const char *annex, gdb_byte *buf,
 253                             ULONGEST offset, LONGEST len);
 254
 255 extern LONGEST target_write (struct target_ops *ops,
 256                              enum target_object object,
 257                              const char *annex, const gdb_byte *buf,
 258                              ULONGEST offset, LONGEST len);
 259
 260 /* Wrappers to target read/write that perform memory transfers.  They
 261    throw an error if the memory transfer fails.
 262
 263    NOTE: cagney/2003-10-23: The naming schema is lifted from
 264    "frame.h".  The parameter order is lifted from get_frame_memory,
 265    which in turn lifted it from read_memory.  */
 266
 267 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 268                                gdb_byte *buf, LONGEST len);
 269 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 270                                             CORE_ADDR addr, int len);
 271 \f
 272
 273 /* If certain kinds of activity happen, target_wait should perform
 274    callbacks.  */
 275 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 276    on TARGET_ACTIVITY_FD.  */
 277 extern int target_activity_fd;
 278 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 279 extern int (*target_activity_function) (void);
 280 \f
 281 struct thread_info;             /* fwd decl for parameter list below: */
 282
 283 struct target_ops
 284   {
 285     struct target_ops *beneath; /* To the target under this one.  */
 286     char *to_shortname;         /* Name this target type */
 287     char *to_longname;          /* Name for printing */
 288     char *to_doc;               /* Documentation.  Does not include trailing
 289                                    newline, and starts with a one-line descrip-
 290                                    tion (probably similar to to_longname).  */
 291     /* Per-target scratch pad.  */
 292     void *to_data;
 293     /* The open routine takes the rest of the parameters from the
 294        command, and (if successful) pushes a new target onto the
 295        stack.  Targets should supply this routine, if only to provide
 296        an error message.  */
 297     void (*to_open) (char *, int);
 298     /* Old targets with a static target vector provide "to_close".
 299        New re-entrant targets provide "to_xclose" and that is expected
 300        to xfree everything (including the "struct target_ops").  */
 301     void (*to_xclose) (struct target_ops *targ, int quitting);
 302     void (*to_close) (int);
 303     void (*to_attach) (char *, int);
 304     void (*to_post_attach) (int);
 305     void (*to_detach) (char *, int);
 306     void (*to_disconnect) (char *, int);
 307     void (*to_resume) (ptid_t, int, enum target_signal);
 308     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 309     void (*to_fetch_registers) (int);
 310     void (*to_store_registers) (int);
 311     void (*to_prepare_to_store) (void);
 312
 313     /* Transfer LEN bytes of memory between GDB address MYADDR and
 314        target address MEMADDR.  If WRITE, transfer them to the target, else
 315        transfer them from the target.  TARGET is the target from which we
 316        get this function.
 317
 318        Return value, N, is one of the following:
 319
 320        0 means that we can't handle this.  If errno has been set, it is the
 321        error which prevented us from doing it (FIXME: What about bfd_error?).
 322
 323        positive (call it N) means that we have transferred N bytes
 324        starting at MEMADDR.  We might be able to handle more bytes
 325        beyond this length, but no promises.
 326
 327        negative (call its absolute value N) means that we cannot
 328        transfer right at MEMADDR, but we could transfer at least
 329        something at MEMADDR + N.
 330
 331        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 332        to_xfer_partial and inferior inheritance.  */
 333
 334     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 335                                    int len, int write,
 336                                    struct mem_attrib *attrib,
 337                                    struct target_ops *target);
 338
 339     void (*to_files_info) (struct target_ops *);
 340     int (*to_insert_breakpoint) (struct bp_target_info *);
 341     int (*to_remove_breakpoint) (struct bp_target_info *);
 342     int (*to_can_use_hw_breakpoint) (int, int, int);
 343     int (*to_insert_hw_breakpoint) (struct bp_target_info *);
 344     int (*to_remove_hw_breakpoint) (struct bp_target_info *);
 345     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 346     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 347     int (*to_stopped_by_watchpoint) (void);
 348     int to_have_continuable_watchpoint;
 349     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 350     int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);
 351     void (*to_terminal_init) (void);
 352     void (*to_terminal_inferior) (void);
 353     void (*to_terminal_ours_for_output) (void);
 354     void (*to_terminal_ours) (void);
 355     void (*to_terminal_save_ours) (void);
 356     void (*to_terminal_info) (char *, int);
 357     void (*to_kill) (void);
 358     void (*to_load) (char *, int);
 359     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 360     void (*to_create_inferior) (char *, char *, char **, int);
 361     void (*to_post_startup_inferior) (ptid_t);
 362     void (*to_acknowledge_created_inferior) (int);
 363     void (*to_insert_fork_catchpoint) (int);
 364     int (*to_remove_fork_catchpoint) (int);
 365     void (*to_insert_vfork_catchpoint) (int);
 366     int (*to_remove_vfork_catchpoint) (int);
 367     int (*to_follow_fork) (struct target_ops *, int);
 368     void (*to_insert_exec_catchpoint) (int);
 369     int (*to_remove_exec_catchpoint) (int);
 370     int (*to_reported_exec_events_per_exec_call) (void);
 371     int (*to_has_exited) (int, int, int *);
 372     void (*to_mourn_inferior) (void);
 373     int (*to_can_run) (void);
 374     void (*to_notice_signals) (ptid_t ptid);
 375     int (*to_thread_alive) (ptid_t ptid);
 376     void (*to_find_new_threads) (void);
 377     char *(*to_pid_to_str) (ptid_t);
 378     char *(*to_extra_thread_info) (struct thread_info *);
 379     void (*to_stop) (void);
 380     void (*to_rcmd) (char *command, struct ui_file *output);
 381     struct symtab_and_line *(*to_enable_exception_callback) (enum
 382                                                              exception_event_kind,
 383                                                              int);
 384     struct exception_event_record *(*to_get_current_exception_event) (void);
 385     char *(*to_pid_to_exec_file) (int pid);
 386     enum strata to_stratum;
 387     int to_has_all_memory;
 388     int to_has_memory;
 389     int to_has_stack;
 390     int to_has_registers;
 391     int to_has_execution;
 392     int to_has_thread_control;  /* control thread execution */
 393     struct section_table
 394      *to_sections;
 395     struct section_table
 396      *to_sections_end;
 397     /* ASYNC target controls */
 398     int (*to_can_async_p) (void);
 399     int (*to_is_async_p) (void);
 400     void (*to_async) (void (*cb) (enum inferior_event_type, void *context),
 401                       void *context);
 402     int to_async_mask_value;
 403     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 404                                             unsigned long,
 405                                             int, int, int,
 406                                             void *),
 407                                    void *);
 408     char * (*to_make_corefile_notes) (bfd *, int *);
 409
 410     /* Return the thread-local address at OFFSET in the
 411        thread-local storage for the thread PTID and the shared library
 412        or executable file given by OBJFILE.  If that block of
 413        thread-local storage hasn't been allocated yet, this function
 414        may return an error.  */
 415     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 416                                               CORE_ADDR load_module_addr,
 417                                               CORE_ADDR offset);
 418
 419     /* Perform partial transfers on OBJECT.  See target_read_partial
 420        and target_write_partial for details of each variant.  One, and
 421        only one, of readbuf or writebuf must be non-NULL.  */
 422     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 423                                 enum target_object object, const char *annex,
 424                                 gdb_byte *readbuf, const gdb_byte *writebuf,
 425                                 ULONGEST offset, LONGEST len);
 426
 427     int to_magic;
 428     /* Need sub-structure for target machine related rather than comm related?
 429      */
 430   };
 431
 432 /* Magic number for checking ops size.  If a struct doesn't end with this
 433    number, somebody changed the declaration but didn't change all the
 434    places that initialize one.  */
 435
 436 #define OPS_MAGIC       3840
 437
 438 /* The ops structure for our "current" target process.  This should
 439    never be NULL.  If there is no target, it points to the dummy_target.  */
 440
 441 extern struct target_ops current_target;
 442
 443 /* Define easy words for doing these operations on our current target.  */
 444
 445 #define target_shortname        (current_target.to_shortname)
 446 #define target_longname         (current_target.to_longname)
 447
 448 /* Does whatever cleanup is required for a target that we are no
 449    longer going to be calling.  QUITTING indicates that GDB is exiting
 450    and should not get hung on an error (otherwise it is important to
 451    perform clean termination, even if it takes a while).  This routine
 452    is automatically always called when popping the target off the
 453    target stack (to_beneath is undefined).  Closing file descriptors
 454    and freeing all memory allocated memory are typical things it
 455    should do.  */
 456
 457 void target_close (struct target_ops *targ, int quitting);
 458
 459 /* Attaches to a process on the target side.  Arguments are as passed
 460    to the `attach' command by the user.  This routine can be called
 461    when the target is not on the target-stack, if the target_can_run
 462    routine returns 1; in that case, it must push itself onto the stack.
 463    Upon exit, the target should be ready for normal operations, and
 464    should be ready to deliver the status of the process immediately
 465    (without waiting) to an upcoming target_wait call.  */
 466
 467 #define target_attach(args, from_tty)   \
 468      (*current_target.to_attach) (args, from_tty)
 469
 470 /* The target_attach operation places a process under debugger control,
 471    and stops the process.
 472
 473    This operation provides a target-specific hook that allows the
 474    necessary bookkeeping to be performed after an attach completes.  */
 475 #define target_post_attach(pid) \
 476      (*current_target.to_post_attach) (pid)
 477
 478 /* Takes a program previously attached to and detaches it.
 479    The program may resume execution (some targets do, some don't) and will
 480    no longer stop on signals, etc.  We better not have left any breakpoints
 481    in the program or it'll die when it hits one.  ARGS is arguments
 482    typed by the user (e.g. a signal to send the process).  FROM_TTY
 483    says whether to be verbose or not.  */
 484
 485 extern void target_detach (char *, int);
 486
 487 /* Disconnect from the current target without resuming it (leaving it
 488    waiting for a debugger).  */
 489
 490 extern void target_disconnect (char *, int);
 491
 492 /* Resume execution of the target process PTID.  STEP says whether to
 493    single-step or to run free; SIGGNAL is the signal to be given to
 494    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 495    pass TARGET_SIGNAL_DEFAULT.  */
 496
 497 #define target_resume(ptid, step, siggnal)                              \
 498   do {                                                                  \
 499     dcache_invalidate(target_dcache);                                   \
 500     (*current_target.to_resume) (ptid, step, siggnal);                  \
 501   } while (0)
 502
 503 /* Wait for process pid to do something.  PTID = -1 to wait for any
 504    pid to do something.  Return pid of child, or -1 in case of error;
 505    store status through argument pointer STATUS.  Note that it is
 506    _NOT_ OK to throw_exception() out of target_wait() without popping
 507    the debugging target from the stack; GDB isn't prepared to get back
 508    to the prompt with a debugging target but without the frame cache,
 509    stop_pc, etc., set up.  */
 510
 511 #define target_wait(ptid, status)               \
 512      (*current_target.to_wait) (ptid, status)
 513
 514 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 515
 516 #define target_fetch_registers(regno)   \
 517      (*current_target.to_fetch_registers) (regno)
 518
 519 /* Store at least register REGNO, or all regs if REGNO == -1.
 520    It can store as many registers as it wants to, so target_prepare_to_store
 521    must have been previously called.  Calls error() if there are problems.  */
 522
 523 #define target_store_registers(regs)    \
 524      (*current_target.to_store_registers) (regs)
 525
 526 /* Get ready to modify the registers array.  On machines which store
 527    individual registers, this doesn't need to do anything.  On machines
 528    which store all the registers in one fell swoop, this makes sure
 529    that REGISTERS contains all the registers from the program being
 530    debugged.  */
 531
 532 #define target_prepare_to_store()       \
 533      (*current_target.to_prepare_to_store) ()
 534
 535 extern DCACHE *target_dcache;
 536
 537 extern int do_xfer_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len,
 538                            int write, struct mem_attrib *attrib);
 539
 540 extern int target_read_string (CORE_ADDR, char **, int, int *);
 541
 542 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 543
 544 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 545                                 int len);
 546
 547 extern int xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 548                         struct mem_attrib *, struct target_ops *);
 549
 550 extern int child_xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 551                               struct mem_attrib *, struct target_ops *);
 552
 553 /* Make a single attempt at transfering LEN bytes.  On a successful
 554    transfer, the number of bytes actually transfered is returned and
 555    ERR is set to 0.  When a transfer fails, -1 is returned (the number
 556    of bytes actually transfered is not defined) and ERR is set to a
 557    non-zero error indication.  */
 558
 559 extern int target_read_memory_partial (CORE_ADDR addr, gdb_byte *buf,
 560                                        int len, int *err);
 561
 562 extern int target_write_memory_partial (CORE_ADDR addr, gdb_byte *buf,
 563                                         int len, int *err);
 564
 565 extern char *child_pid_to_exec_file (int);
 566
 567 extern char *child_core_file_to_sym_file (char *);
 568
 569 #if defined(CHILD_POST_ATTACH)
 570 extern void child_post_attach (int);
 571 #endif
 572
 573 extern void child_post_startup_inferior (ptid_t);
 574
 575 extern void child_acknowledge_created_inferior (int);
 576
 577 extern void child_insert_fork_catchpoint (int);
 578
 579 extern int child_remove_fork_catchpoint (int);
 580
 581 extern void child_insert_vfork_catchpoint (int);
 582
 583 extern int child_remove_vfork_catchpoint (int);
 584
 585 extern void child_acknowledge_created_inferior (int);
 586
 587 extern int child_follow_fork (struct target_ops *, int);
 588
 589 extern void child_insert_exec_catchpoint (int);
 590
 591 extern int child_remove_exec_catchpoint (int);
 592
 593 extern int child_reported_exec_events_per_exec_call (void);
 594
 595 extern int child_has_exited (int, int, int *);
 596
 597 extern int child_thread_alive (ptid_t);
 598
 599 /* From infrun.c.  */
 600
 601 extern int inferior_has_forked (int pid, int *child_pid);
 602
 603 extern int inferior_has_vforked (int pid, int *child_pid);
 604
 605 extern int inferior_has_execd (int pid, char **execd_pathname);
 606
 607 /* From exec.c */
 608
 609 extern void print_section_info (struct target_ops *, bfd *);
 610
 611 /* Print a line about the current target.  */
 612
 613 #define target_files_info()     \
 614      (*current_target.to_files_info) (&current_target)
 615
 616 /* Insert a breakpoint at address BP_TGT->placed_address in the target
 617    machine.  Result is 0 for success, or an errno value.  */
 618
 619 #define target_insert_breakpoint(bp_tgt)        \
 620      (*current_target.to_insert_breakpoint) (bp_tgt)
 621
 622 /* Remove a breakpoint at address BP_TGT->placed_address in the target
 623    machine.  Result is 0 for success, or an errno value.  */
 624
 625 #define target_remove_breakpoint(bp_tgt)        \
 626      (*current_target.to_remove_breakpoint) (bp_tgt)
 627
 628 /* Initialize the terminal settings we record for the inferior,
 629    before we actually run the inferior.  */
 630
 631 #define target_terminal_init() \
 632      (*current_target.to_terminal_init) ()
 633
 634 /* Put the inferior's terminal settings into effect.
 635    This is preparation for starting or resuming the inferior.  */
 636
 637 #define target_terminal_inferior() \
 638      (*current_target.to_terminal_inferior) ()
 639
 640 /* Put some of our terminal settings into effect,
 641    enough to get proper results from our output,
 642    but do not change into or out of RAW mode
 643    so that no input is discarded.
 644
 645    After doing this, either terminal_ours or terminal_inferior
 646    should be called to get back to a normal state of affairs.  */
 647
 648 #define target_terminal_ours_for_output() \
 649      (*current_target.to_terminal_ours_for_output) ()
 650
 651 /* Put our terminal settings into effect.
 652    First record the inferior's terminal settings
 653    so they can be restored properly later.  */
 654
 655 #define target_terminal_ours() \
 656      (*current_target.to_terminal_ours) ()
 657
 658 /* Save our terminal settings.
 659    This is called from TUI after entering or leaving the curses
 660    mode.  Since curses modifies our terminal this call is here
 661    to take this change into account.  */
 662
 663 #define target_terminal_save_ours() \
 664      (*current_target.to_terminal_save_ours) ()
 665
 666 /* Print useful information about our terminal status, if such a thing
 667    exists.  */
 668
 669 #define target_terminal_info(arg, from_tty) \
 670      (*current_target.to_terminal_info) (arg, from_tty)
 671
 672 /* Kill the inferior process.   Make it go away.  */
 673
 674 #define target_kill() \
 675      (*current_target.to_kill) ()
 676
 677 /* Load an executable file into the target process.  This is expected
 678    to not only bring new code into the target process, but also to
 679    update GDB's symbol tables to match.
 680
 681    ARG contains command-line arguments, to be broken down with
 682    buildargv ().  The first non-switch argument is the filename to
 683    load, FILE; the second is a number (as parsed by strtoul (..., ...,
 684    0)), which is an offset to apply to the load addresses of FILE's
 685    sections.  The target may define switches, or other non-switch
 686    arguments, as it pleases.  */
 687
 688 extern void target_load (char *arg, int from_tty);
 689
 690 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 691    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 692    symbol should be returned.  The result is 0 if successful, nonzero
 693    if the symbol does not exist in the target environment.  This
 694    function should not call error() if communication with the target
 695    is interrupted, since it is called from symbol reading, but should
 696    return nonzero, possibly doing a complain().  */
 697
 698 #define target_lookup_symbol(name, addrp) \
 699      (*current_target.to_lookup_symbol) (name, addrp)
 700
 701 /* Start an inferior process and set inferior_ptid to its pid.
 702    EXEC_FILE is the file to run.
 703    ALLARGS is a string containing the arguments to the program.
 704    ENV is the environment vector to pass.  Errors reported with error().
 705    On VxWorks and various standalone systems, we ignore exec_file.  */
 706
 707 #define target_create_inferior(exec_file, args, env, FROM_TTY)  \
 708      (*current_target.to_create_inferior) (exec_file, args, env, (FROM_TTY))
 709
 710
 711 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 712    notification of inferior events such as fork and vork immediately
 713    after the inferior is created.  (This because of how gdb gets an
 714    inferior created via invoking a shell to do it.  In such a scenario,
 715    if the shell init file has commands in it, the shell will fork and
 716    exec for each of those commands, and we will see each such fork
 717    event.  Very bad.)
 718
 719    Such targets will supply an appropriate definition for this function.  */
 720
 721 #define target_post_startup_inferior(ptid) \
 722      (*current_target.to_post_startup_inferior) (ptid)
 723
 724 /* On some targets, the sequence of starting up an inferior requires
 725    some synchronization between gdb and the new inferior process, PID.  */
 726
 727 #define target_acknowledge_created_inferior(pid) \
 728      (*current_target.to_acknowledge_created_inferior) (pid)
 729
 730 /* On some targets, we can catch an inferior fork or vfork event when
 731    it occurs.  These functions insert/remove an already-created
 732    catchpoint for such events.  */
 733
 734 #define target_insert_fork_catchpoint(pid) \
 735      (*current_target.to_insert_fork_catchpoint) (pid)
 736
 737 #define target_remove_fork_catchpoint(pid) \
 738      (*current_target.to_remove_fork_catchpoint) (pid)
 739
 740 #define target_insert_vfork_catchpoint(pid) \
 741      (*current_target.to_insert_vfork_catchpoint) (pid)
 742
 743 #define target_remove_vfork_catchpoint(pid) \
 744      (*current_target.to_remove_vfork_catchpoint) (pid)
 745
 746 /* If the inferior forks or vforks, this function will be called at
 747    the next resume in order to perform any bookkeeping and fiddling
 748    necessary to continue debugging either the parent or child, as
 749    requested, and releasing the other.  Information about the fork
 750    or vfork event is available via get_last_target_status ().
 751    This function returns 1 if the inferior should not be resumed
 752    (i.e. there is another event pending).  */
 753
 754 int target_follow_fork (int follow_child);
 755
 756 /* On some targets, we can catch an inferior exec event when it
 757    occurs.  These functions insert/remove an already-created
 758    catchpoint for such events.  */
 759
 760 #define target_insert_exec_catchpoint(pid) \
 761      (*current_target.to_insert_exec_catchpoint) (pid)
 762
 763 #define target_remove_exec_catchpoint(pid) \
 764      (*current_target.to_remove_exec_catchpoint) (pid)
 765
 766 /* Returns the number of exec events that are reported when a process
 767    invokes a flavor of the exec() system call on this target, if exec
 768    events are being reported.  */
 769
 770 #define target_reported_exec_events_per_exec_call() \
 771      (*current_target.to_reported_exec_events_per_exec_call) ()
 772
 773 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 774    exit code of PID, if any.  */
 775
 776 #define target_has_exited(pid,wait_status,exit_status) \
 777      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 778
 779 /* The debugger has completed a blocking wait() call.  There is now
 780    some process event that must be processed.  This function should
 781    be defined by those targets that require the debugger to perform
 782    cleanup or internal state changes in response to the process event.  */
 783
 784 /* The inferior process has died.  Do what is right.  */
 785
 786 #define target_mourn_inferior() \
 787      (*current_target.to_mourn_inferior) ()
 788
 789 /* Does target have enough data to do a run or attach command? */
 790
 791 #define target_can_run(t) \
 792      ((t)->to_can_run) ()
 793
 794 /* post process changes to signal handling in the inferior.  */
 795
 796 #define target_notice_signals(ptid) \
 797      (*current_target.to_notice_signals) (ptid)
 798
 799 /* Check to see if a thread is still alive.  */
 800
 801 #define target_thread_alive(ptid) \
 802      (*current_target.to_thread_alive) (ptid)
 803
 804 /* Query for new threads and add them to the thread list.  */
 805
 806 #define target_find_new_threads() \
 807      (*current_target.to_find_new_threads) (); \
 808
 809 /* Make target stop in a continuable fashion.  (For instance, under
 810    Unix, this should act like SIGSTOP).  This function is normally
 811    used by GUIs to implement a stop button.  */
 812
 813 #define target_stop current_target.to_stop
 814
 815 /* Send the specified COMMAND to the target's monitor
 816    (shell,interpreter) for execution.  The result of the query is
 817    placed in OUTBUF.  */
 818
 819 #define target_rcmd(command, outbuf) \
 820      (*current_target.to_rcmd) (command, outbuf)
 821
 822
 823 /* Get the symbol information for a breakpointable routine called when
 824    an exception event occurs.
 825    Intended mainly for C++, and for those
 826    platforms/implementations where such a callback mechanism is available,
 827    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 828    different mechanisms for debugging exceptions.  */
 829
 830 #define target_enable_exception_callback(kind, enable) \
 831      (*current_target.to_enable_exception_callback) (kind, enable)
 832
 833 /* Get the current exception event kind -- throw or catch, etc.  */
 834
 835 #define target_get_current_exception_event() \
 836      (*current_target.to_get_current_exception_event) ()
 837
 838 /* Does the target include all of memory, or only part of it?  This
 839    determines whether we look up the target chain for other parts of
 840    memory if this target can't satisfy a request.  */
 841
 842 #define target_has_all_memory   \
 843      (current_target.to_has_all_memory)
 844
 845 /* Does the target include memory?  (Dummy targets don't.)  */
 846
 847 #define target_has_memory       \
 848      (current_target.to_has_memory)
 849
 850 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 851    we start a process.)  */
 852
 853 #define target_has_stack        \
 854      (current_target.to_has_stack)
 855
 856 /* Does the target have registers?  (Exec files don't.)  */
 857
 858 #define target_has_registers    \
 859      (current_target.to_has_registers)
 860
 861 /* Does the target have execution?  Can we make it jump (through
 862    hoops), or pop its stack a few times?  FIXME: If this is to work that
 863    way, it needs to check whether an inferior actually exists.
 864    remote-udi.c and probably other targets can be the current target
 865    when the inferior doesn't actually exist at the moment.  Right now
 866    this just tells us whether this target is *capable* of execution.  */
 867
 868 #define target_has_execution    \
 869      (current_target.to_has_execution)
 870
 871 /* Can the target support the debugger control of thread execution?
 872    a) Can it lock the thread scheduler?
 873    b) Can it switch the currently running thread?  */
 874
 875 #define target_can_lock_scheduler \
 876      (current_target.to_has_thread_control & tc_schedlock)
 877
 878 #define target_can_switch_threads \
 879      (current_target.to_has_thread_control & tc_switch)
 880
 881 /* Can the target support asynchronous execution? */
 882 #define target_can_async_p() (current_target.to_can_async_p ())
 883
 884 /* Is the target in asynchronous execution mode? */
 885 #define target_is_async_p() (current_target.to_is_async_p())
 886
 887 /* Put the target in async mode with the specified callback function. */
 888 #define target_async(CALLBACK,CONTEXT) \
 889      (current_target.to_async((CALLBACK), (CONTEXT)))
 890
 891 /* This is to be used ONLY within call_function_by_hand(). It provides
 892    a workaround, to have inferior function calls done in sychronous
 893    mode, even though the target is asynchronous. After
 894    target_async_mask(0) is called, calls to target_can_async_p() will
 895    return FALSE , so that target_resume() will not try to start the
 896    target asynchronously. After the inferior stops, we IMMEDIATELY
 897    restore the previous nature of the target, by calling
 898    target_async_mask(1). After that, target_can_async_p() will return
 899    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 900
 901    FIXME ezannoni 1999-12-13: we won't need this once we move
 902    the turning async on and off to the single execution commands,
 903    from where it is done currently, in remote_resume().  */
 904
 905 #define target_async_mask_value \
 906      (current_target.to_async_mask_value)
 907
 908 extern int target_async_mask (int mask);
 909
 910 /* Converts a process id to a string.  Usually, the string just contains
 911    `process xyz', but on some systems it may contain
 912    `process xyz thread abc'.  */
 913
 914 #undef target_pid_to_str
 915 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
 916
 917 #ifndef target_tid_to_str
 918 #define target_tid_to_str(PID) \
 919      target_pid_to_str (PID)
 920 extern char *normal_pid_to_str (ptid_t ptid);
 921 #endif
 922
 923 /* Return a short string describing extra information about PID,
 924    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
 925    is okay.  */
 926
 927 #define target_extra_thread_info(TP) \
 928      (current_target.to_extra_thread_info (TP))
 929
 930 /*
 931  * New Objfile Event Hook:
 932  *
 933  * Sometimes a GDB component wants to get notified whenever a new
 934  * objfile is loaded.  Mainly this is used by thread-debugging
 935  * implementations that need to know when symbols for the target
 936  * thread implemenation are available.
 937  *
 938  * The old way of doing this is to define a macro 'target_new_objfile'
 939  * that points to the function that you want to be called on every
 940  * objfile/shlib load.
 941
 942    The new way is to grab the function pointer,
 943    'deprecated_target_new_objfile_hook', and point it to the function
 944    that you want to be called on every objfile/shlib load.
 945
 946    If multiple clients are willing to be cooperative, they can each
 947    save a pointer to the previous value of
 948    deprecated_target_new_objfile_hook before modifying it, and arrange
 949    for their function to call the previous function in the chain.  In
 950    that way, multiple clients can receive this notification (something
 951    like with signal handlers).  */
 952
 953 extern void (*deprecated_target_new_objfile_hook) (struct objfile *);
 954
 955 #ifndef target_pid_or_tid_to_str
 956 #define target_pid_or_tid_to_str(ID) \
 957      target_pid_to_str (ID)
 958 #endif
 959
 960 /* Attempts to find the pathname of the executable file
 961    that was run to create a specified process.
 962
 963    The process PID must be stopped when this operation is used.
 964
 965    If the executable file cannot be determined, NULL is returned.
 966
 967    Else, a pointer to a character string containing the pathname
 968    is returned.  This string should be copied into a buffer by
 969    the client if the string will not be immediately used, or if
 970    it must persist.  */
 971
 972 #define target_pid_to_exec_file(pid) \
 973      (current_target.to_pid_to_exec_file) (pid)
 974
 975 /*
 976  * Iterator function for target memory regions.
 977  * Calls a callback function once for each memory region 'mapped'
 978  * in the child process.  Defined as a simple macro rather than
 979  * as a function macro so that it can be tested for nullity.
 980  */
 981
 982 #define target_find_memory_regions(FUNC, DATA) \
 983      (current_target.to_find_memory_regions) (FUNC, DATA)
 984
 985 /*
 986  * Compose corefile .note section.
 987  */
 988
 989 #define target_make_corefile_notes(BFD, SIZE_P) \
 990      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
 991
 992 /* Thread-local values.  */
 993 #define target_get_thread_local_address \
 994     (current_target.to_get_thread_local_address)
 995 #define target_get_thread_local_address_p() \
 996     (target_get_thread_local_address != NULL)
 997
 998 /* Hook to call target dependent code just after inferior target process has
 999    started.  */
1000
1001 #ifndef TARGET_CREATE_INFERIOR_HOOK
1002 #define TARGET_CREATE_INFERIOR_HOOK(PID)
1003 #endif
1004
1005 /* Hardware watchpoint interfaces.  */
1006
1007 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1008    write).  */
1009
1010 #ifndef STOPPED_BY_WATCHPOINT
1011 #define STOPPED_BY_WATCHPOINT(w) \
1012    (*current_target.to_stopped_by_watchpoint) ()
1013 #endif
1014
1015 /* Non-zero if we have continuable watchpoints  */
1016
1017 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1018 #define HAVE_CONTINUABLE_WATCHPOINT \
1019    (current_target.to_have_continuable_watchpoint)
1020 #endif
1021
1022 /* Provide defaults for hardware watchpoint functions.  */
1023
1024 /* If the *_hw_beakpoint functions have not been defined
1025    elsewhere use the definitions in the target vector.  */
1026
1027 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1028    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1029    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1030    (including this one?).  OTHERTYPE is who knows what...  */
1031
1032 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1033 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1034  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1035 #endif
1036
1037 #ifndef TARGET_REGION_OK_FOR_HW_WATCHPOINT
1038 #define TARGET_REGION_OK_FOR_HW_WATCHPOINT(addr, len) \
1039     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1040 #endif
1041
1042
1043 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1044    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1045    success, non-zero for failure.  */
1046
1047 #ifndef target_insert_watchpoint
1048 #define target_insert_watchpoint(addr, len, type)       \
1049      (*current_target.to_insert_watchpoint) (addr, len, type)
1050
1051 #define target_remove_watchpoint(addr, len, type)       \
1052      (*current_target.to_remove_watchpoint) (addr, len, type)
1053 #endif
1054
1055 #ifndef target_insert_hw_breakpoint
1056 #define target_insert_hw_breakpoint(bp_tgt) \
1057      (*current_target.to_insert_hw_breakpoint) (bp_tgt)
1058
1059 #define target_remove_hw_breakpoint(bp_tgt) \
1060      (*current_target.to_remove_hw_breakpoint) (bp_tgt)
1061 #endif
1062
1063 extern int target_stopped_data_address_p (struct target_ops *);
1064
1065 #ifndef target_stopped_data_address
1066 #define target_stopped_data_address(target, x) \
1067     (*target.to_stopped_data_address) (target, x)
1068 #else
1069 /* Horrible hack to get around existing macros :-(.  */
1070 #define target_stopped_data_address_p(CURRENT_TARGET) (1)
1071 #endif
1072
1073 /* This will only be defined by a target that supports catching vfork events,
1074    such as HP-UX.
1075
1076    On some targets (such as HP-UX 10.20 and earlier), resuming a newly vforked
1077    child process after it has exec'd, causes the parent process to resume as
1078    well.  To prevent the parent from running spontaneously, such targets should
1079    define this to a function that prevents that from happening.  */
1080 #if !defined(ENSURE_VFORKING_PARENT_REMAINS_STOPPED)
1081 #define ENSURE_VFORKING_PARENT_REMAINS_STOPPED(PID) (0)
1082 #endif
1083
1084 /* This will only be defined by a target that supports catching vfork events,
1085    such as HP-UX.
1086
1087    On some targets (such as HP-UX 10.20 and earlier), a newly vforked child
1088    process must be resumed when it delivers its exec event, before the parent
1089    vfork event will be delivered to us.  */
1090
1091 #if !defined(RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK)
1092 #define RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK() (0)
1093 #endif
1094
1095 /* Routines for maintenance of the target structures...
1096
1097    add_target:   Add a target to the list of all possible targets.
1098
1099    push_target:  Make this target the top of the stack of currently used
1100    targets, within its particular stratum of the stack.  Result
1101    is 0 if now atop the stack, nonzero if not on top (maybe
1102    should warn user).
1103
1104    unpush_target: Remove this from the stack of currently used targets,
1105    no matter where it is on the list.  Returns 0 if no
1106    change, 1 if removed from stack.
1107
1108    pop_target:   Remove the top thing on the stack of current targets.  */
1109
1110 extern void add_target (struct target_ops *);
1111
1112 extern int push_target (struct target_ops *);
1113
1114 extern int unpush_target (struct target_ops *);
1115
1116 extern void target_preopen (int);
1117
1118 extern void pop_target (void);
1119
1120 /* Struct section_table maps address ranges to file sections.  It is
1121    mostly used with BFD files, but can be used without (e.g. for handling
1122    raw disks, or files not in formats handled by BFD).  */
1123
1124 struct section_table
1125   {
1126     CORE_ADDR addr;             /* Lowest address in section */
1127     CORE_ADDR endaddr;          /* 1+highest address in section */
1128
1129     struct bfd_section *the_bfd_section;
1130
1131     bfd *bfd;                   /* BFD file pointer */
1132   };
1133
1134 /* Return the "section" containing the specified address.  */
1135 struct section_table *target_section_by_addr (struct target_ops *target,
1136                                               CORE_ADDR addr);
1137
1138
1139 /* From mem-break.c */
1140
1141 extern int memory_remove_breakpoint (struct bp_target_info *);
1142
1143 extern int memory_insert_breakpoint (struct bp_target_info *);
1144
1145 extern int default_memory_remove_breakpoint (struct bp_target_info *);
1146
1147 extern int default_memory_insert_breakpoint (struct bp_target_info *);
1148
1149
1150 /* From target.c */
1151
1152 extern void initialize_targets (void);
1153
1154 extern void noprocess (void);
1155
1156 extern void find_default_attach (char *, int);
1157
1158 extern void find_default_create_inferior (char *, char *, char **, int);
1159
1160 extern struct target_ops *find_run_target (void);
1161
1162 extern struct target_ops *find_core_target (void);
1163
1164 extern struct target_ops *find_target_beneath (struct target_ops *);
1165
1166 extern int target_resize_to_sections (struct target_ops *target,
1167                                       int num_added);
1168
1169 extern void remove_target_sections (bfd *abfd);
1170
1171 \f
1172 /* Stuff that should be shared among the various remote targets.  */
1173
1174 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1175    information (higher values, more information).  */
1176 extern int remote_debug;
1177
1178 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1179 extern int baud_rate;
1180 /* Timeout limit for response from target. */
1181 extern int remote_timeout;
1182
1183 \f
1184 /* Functions for helping to write a native target.  */
1185
1186 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1187 extern void store_waitstatus (struct target_waitstatus *, int);
1188
1189 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1190    targ_signal SIGNO has an equivalent ``host'' representation.  */
1191 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1192    to the shorter target_signal_p() because it is far less ambigious.
1193    In this context ``target_signal'' refers to GDB's internal
1194    representation of the target's set of signals while ``host signal''
1195    refers to the target operating system's signal.  Confused?  */
1196
1197 extern int target_signal_to_host_p (enum target_signal signo);
1198
1199 /* Convert between host signal numbers and enum target_signal's.
1200    target_signal_to_host() returns 0 and prints a warning() on GDB's
1201    console if SIGNO has no equivalent host representation.  */
1202 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1203    refering to the target operating system's signal numbering.
1204    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1205    gdb_signal'' would probably be better as it is refering to GDB's
1206    internal representation of a target operating system's signal.  */
1207
1208 extern enum target_signal target_signal_from_host (int);
1209 extern int target_signal_to_host (enum target_signal);
1210
1211 /* Convert from a number used in a GDB command to an enum target_signal.  */
1212 extern enum target_signal target_signal_from_command (int);
1213
1214 /* Any target can call this to switch to remote protocol (in remote.c). */
1215 extern void push_remote_target (char *name, int from_tty);
1216 \f
1217 /* Imported from machine dependent code */
1218
1219 /* Blank target vector entries are initialized to target_ignore. */
1220 void target_ignore (void);
1221
1222 extern struct target_ops deprecated_child_ops;
1223
1224 #endif /* !defined (TARGET_H) */