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
  34 /* This include file defines the interface between the main part
  35    of the debugger, and the part which is target-specific, or
  36    specific to the communications interface between us and the
  37    target.
  38
  39    A TARGET is an interface between the debugger and a particular
  40    kind of file or process.  Targets can be STACKED in STRATA,
  41    so that more than one target can potentially respond to a request.
  42    In particular, memory accesses will walk down the stack of targets
  43    until they find a target that is interested in handling that particular
  44    address.  STRATA are artificial boundaries on the stack, within
  45    which particular kinds of targets live.  Strata exist so that
  46    people don't get confused by pushing e.g. a process target and then
  47    a file target, and wondering why they can't see the current values
  48    of variables any more (the file target is handling them and they
  49    never get to the process target).  So when you push a file target,
  50    it goes into the file stratum, which is always below the process
  51    stratum.  */
  52
  53 #include "bfd.h"
  54 #include "symtab.h"
  55 #include "dcache.h"
  56 #include "memattr.h"
  57
  58 enum strata
  59   {
  60     dummy_stratum,              /* The lowest of the low */
  61     file_stratum,               /* Executable files, etc */
  62     core_stratum,               /* Core dump files */
  63     download_stratum,           /* Downloading of remote targets */
  64     process_stratum,            /* Executing processes */
  65     thread_stratum              /* Executing threads */
  66   };
  67
  68 enum thread_control_capabilities
  69   {
  70     tc_none = 0,                /* Default: can't control thread execution.  */
  71     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  72     tc_switch = 2               /* Can switch the running thread on demand.  */
  73   };
  74
  75 /* Stuff for target_wait.  */
  76
  77 /* Generally, what has the program done?  */
  78 enum target_waitkind
  79   {
  80     /* The program has exited.  The exit status is in value.integer.  */
  81     TARGET_WAITKIND_EXITED,
  82
  83     /* The program has stopped with a signal.  Which signal is in
  84        value.sig.  */
  85     TARGET_WAITKIND_STOPPED,
  86
  87     /* The program has terminated with a signal.  Which signal is in
  88        value.sig.  */
  89     TARGET_WAITKIND_SIGNALLED,
  90
  91     /* The program is letting us know that it dynamically loaded something
  92        (e.g. it called load(2) on AIX).  */
  93     TARGET_WAITKIND_LOADED,
  94
  95     /* The program has forked.  A "related" process' ID is in
  96        value.related_pid.  I.e., if the child forks, value.related_pid
  97        is the parent's ID.  */
  98
  99     TARGET_WAITKIND_FORKED,
 100
 101     /* The program has vforked.  A "related" process's ID is in
 102        value.related_pid.  */
 103
 104     TARGET_WAITKIND_VFORKED,
 105
 106     /* The program has exec'ed a new executable file.  The new file's
 107        pathname is pointed to by value.execd_pathname.  */
 108
 109     TARGET_WAITKIND_EXECD,
 110
 111     /* The program has entered or returned from a system call.  On
 112        HP-UX, this is used in the hardware watchpoint implementation.
 113        The syscall's unique integer ID number is in value.syscall_id */
 114
 115     TARGET_WAITKIND_SYSCALL_ENTRY,
 116     TARGET_WAITKIND_SYSCALL_RETURN,
 117
 118     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 119        within target_wait, but I'm not sure target_wait should be resuming the
 120        inferior.  */
 121     TARGET_WAITKIND_SPURIOUS,
 122
 123     /* An event has occured, but we should wait again.
 124        Remote_async_wait() returns this when there is an event
 125        on the inferior, but the rest of the world is not interested in
 126        it. The inferior has not stopped, but has just sent some output
 127        to the console, for instance. In this case, we want to go back
 128        to the event loop and wait there for another event from the
 129        inferior, rather than being stuck in the remote_async_wait()
 130        function. This way the event loop is responsive to other events,
 131        like for instance the user typing.  */
 132     TARGET_WAITKIND_IGNORE
 133   };
 134
 135 struct target_waitstatus
 136   {
 137     enum target_waitkind kind;
 138
 139     /* Forked child pid, execd pathname, exit status or signal number.  */
 140     union
 141       {
 142         int integer;
 143         enum target_signal sig;
 144         int related_pid;
 145         char *execd_pathname;
 146         int syscall_id;
 147       }
 148     value;
 149   };
 150
 151 /* Possible types of events that the inferior handler will have to
 152    deal with.  */
 153 enum inferior_event_type
 154   {
 155     /* There is a request to quit the inferior, abandon it.  */
 156     INF_QUIT_REQ,
 157     /* Process a normal inferior event which will result in target_wait
 158        being called.  */
 159     INF_REG_EVENT,
 160     /* Deal with an error on the inferior.  */
 161     INF_ERROR,
 162     /* We are called because a timer went off.  */
 163     INF_TIMER,
 164     /* We are called to do stuff after the inferior stops.  */
 165     INF_EXEC_COMPLETE,
 166     /* We are called to do some stuff after the inferior stops, but we
 167        are expected to reenter the proceed() and
 168        handle_inferior_event() functions. This is used only in case of
 169        'step n' like commands.  */
 170     INF_EXEC_CONTINUE
 171   };
 172
 173 /* Return the string for a signal.  */
 174 extern char *target_signal_to_string (enum target_signal);
 175
 176 /* Return the name (SIGHUP, etc.) for a signal.  */
 177 extern char *target_signal_to_name (enum target_signal);
 178
 179 /* Given a name (SIGHUP, etc.), return its signal.  */
 180 enum target_signal target_signal_from_name (char *);
 181 \f
 182 /* Request the transfer of up to LEN 8-bit bytes of the target's
 183    OBJECT.  The OFFSET, for a seekable object, specifies the starting
 184    point.  The ANNEX can be used to provide additional data-specific
 185    information to the target.
 186
 187    Return the number of bytes actually transfered, zero when no
 188    further transfer is possible, and -1 when the transfer is not
 189    supported.
 190
 191    NOTE: cagney/2003-10-17: The current interface does not support a
 192    "retry" mechanism.  Instead it assumes that at least one byte will
 193    be transfered on each call.
 194
 195    NOTE: cagney/2003-10-17: The current interface can lead to
 196    fragmented transfers.  Lower target levels should not implement
 197    hacks, such as enlarging the transfer, in an attempt to compensate
 198    for this.  Instead, the target stack should be extended so that it
 199    implements supply/collect methods and a look-aside object cache.
 200    With that available, the lowest target can safely and freely "push"
 201    data up the stack.
 202
 203    NOTE: cagney/2003-10-17: Unlike the old query and the memory
 204    transfer mechanisms, these methods are explicitly parameterized by
 205    the target that it should be applied to.
 206
 207    NOTE: cagney/2003-10-17: Just like the old query and memory xfer
 208    methods, these new methods perform partial transfers.  The only
 209    difference is that these new methods thought to include "partial"
 210    in the name.  The old code's failure to do this lead to much
 211    confusion and duplication of effort as each target object attempted
 212    to locally take responsibility for something it didn't have to
 213    worry about.
 214
 215    NOTE: cagney/2003-10-17: With a TARGET_OBJECT_KOD object, for
 216    backward compatibility with the "target_query" method that this
 217    replaced, when OFFSET and LEN are both zero, return the "minimum"
 218    buffer size.  See "remote.c" for further information.  */
 219
 220 enum target_object
 221 {
 222   /* Kernel Object Display transfer.  See "kod.c" and "remote.c".  */
 223   TARGET_OBJECT_KOD,
 224   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 225   TARGET_OBJECT_AVR,
 226   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 227   TARGET_OBJECT_MEMORY,
 228   /* Kernel Unwind Table.  See "ia64-tdep.c".  */
 229   TARGET_OBJECT_UNWIND_TABLE,
 230   /* Transfer auxilliary vector.  */
 231   TARGET_OBJECT_AUXV,
 232   /* StackGhost cookie.  See "sparc-tdep.c".  */
 233   TARGET_OBJECT_WCOOKIE
 234
 235   /* Possible future objects: TARGET_OBJECT_FILE, TARGET_OBJECT_PROC, ... */
 236 };
 237
 238 extern LONGEST target_read_partial (struct target_ops *ops,
 239                                     enum target_object object,
 240                                     const char *annex, gdb_byte *buf,
 241                                     ULONGEST offset, LONGEST len);
 242
 243 extern LONGEST target_write_partial (struct target_ops *ops,
 244                                      enum target_object object,
 245                                      const char *annex, const gdb_byte *buf,
 246                                      ULONGEST offset, LONGEST len);
 247
 248 /* Wrappers to perform the full transfer.  */
 249 extern LONGEST target_read (struct target_ops *ops,
 250                             enum target_object object,
 251                             const char *annex, gdb_byte *buf,
 252                             ULONGEST offset, LONGEST len);
 253
 254 extern LONGEST target_write (struct target_ops *ops,
 255                              enum target_object object,
 256                              const char *annex, const gdb_byte *buf,
 257                              ULONGEST offset, LONGEST len);
 258
 259 /* Wrappers to target read/write that perform memory transfers.  They
 260    throw an error if the memory transfer fails.
 261
 262    NOTE: cagney/2003-10-23: The naming schema is lifted from
 263    "frame.h".  The parameter order is lifted from get_frame_memory,
 264    which in turn lifted it from read_memory.  */
 265
 266 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 267                                gdb_byte *buf, LONGEST len);
 268 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 269                                             CORE_ADDR addr, int len);
 270 \f
 271
 272 /* If certain kinds of activity happen, target_wait should perform
 273    callbacks.  */
 274 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 275    on TARGET_ACTIVITY_FD.  */
 276 extern int target_activity_fd;
 277 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 278 extern int (*target_activity_function) (void);
 279 \f
 280 struct thread_info;             /* fwd decl for parameter list below: */
 281
 282 struct target_ops
 283   {
 284     struct target_ops *beneath; /* To the target under this one.  */
 285     char *to_shortname;         /* Name this target type */
 286     char *to_longname;          /* Name for printing */
 287     char *to_doc;               /* Documentation.  Does not include trailing
 288                                    newline, and starts with a one-line descrip-
 289                                    tion (probably similar to to_longname).  */
 290     /* Per-target scratch pad.  */
 291     void *to_data;
 292     /* The open routine takes the rest of the parameters from the
 293        command, and (if successful) pushes a new target onto the
 294        stack.  Targets should supply this routine, if only to provide
 295        an error message.  */
 296     void (*to_open) (char *, int);
 297     /* Old targets with a static target vector provide "to_close".
 298        New re-entrant targets provide "to_xclose" and that is expected
 299        to xfree everything (including the "struct target_ops").  */
 300     void (*to_xclose) (struct target_ops *targ, int quitting);
 301     void (*to_close) (int);
 302     void (*to_attach) (char *, int);
 303     void (*to_post_attach) (int);
 304     void (*to_detach) (char *, int);
 305     void (*to_disconnect) (char *, int);
 306     void (*to_resume) (ptid_t, int, enum target_signal);
 307     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 308     void (*to_fetch_registers) (int);
 309     void (*to_store_registers) (int);
 310     void (*to_prepare_to_store) (void);
 311
 312     /* Transfer LEN bytes of memory between GDB address MYADDR and
 313        target address MEMADDR.  If WRITE, transfer them to the target, else
 314        transfer them from the target.  TARGET is the target from which we
 315        get this function.
 316
 317        Return value, N, is one of the following:
 318
 319        0 means that we can't handle this.  If errno has been set, it is the
 320        error which prevented us from doing it (FIXME: What about bfd_error?).
 321
 322        positive (call it N) means that we have transferred N bytes
 323        starting at MEMADDR.  We might be able to handle more bytes
 324        beyond this length, but no promises.
 325
 326        negative (call its absolute value N) means that we cannot
 327        transfer right at MEMADDR, but we could transfer at least
 328        something at MEMADDR + N.
 329
 330        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 331        to_xfer_partial and inferior inheritance.  */
 332
 333     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, gdb_byte *myaddr,
 334                                    int len, int write,
 335                                    struct mem_attrib *attrib,
 336                                    struct target_ops *target);
 337
 338     void (*to_files_info) (struct target_ops *);
 339     int (*to_insert_breakpoint) (CORE_ADDR, gdb_byte *);
 340     int (*to_remove_breakpoint) (CORE_ADDR, gdb_byte *);
 341     int (*to_can_use_hw_breakpoint) (int, int, int);
 342     int (*to_insert_hw_breakpoint) (CORE_ADDR, gdb_byte *);
 343     int (*to_remove_hw_breakpoint) (CORE_ADDR, gdb_byte *);
 344     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 345     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 346     int (*to_stopped_by_watchpoint) (void);
 347     int to_have_continuable_watchpoint;
 348     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 349     int (*to_region_ok_for_hw_watchpoint) (CORE_ADDR, int);
 350     void (*to_terminal_init) (void);
 351     void (*to_terminal_inferior) (void);
 352     void (*to_terminal_ours_for_output) (void);
 353     void (*to_terminal_ours) (void);
 354     void (*to_terminal_save_ours) (void);
 355     void (*to_terminal_info) (char *, int);
 356     void (*to_kill) (void);
 357     void (*to_load) (char *, int);
 358     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 359     void (*to_create_inferior) (char *, char *, char **, int);
 360     void (*to_post_startup_inferior) (ptid_t);
 361     void (*to_acknowledge_created_inferior) (int);
 362     void (*to_insert_fork_catchpoint) (int);
 363     int (*to_remove_fork_catchpoint) (int);
 364     void (*to_insert_vfork_catchpoint) (int);
 365     int (*to_remove_vfork_catchpoint) (int);
 366     int (*to_follow_fork) (struct target_ops *, int);
 367     void (*to_insert_exec_catchpoint) (int);
 368     int (*to_remove_exec_catchpoint) (int);
 369     int (*to_reported_exec_events_per_exec_call) (void);
 370     int (*to_has_exited) (int, int, int *);
 371     void (*to_mourn_inferior) (void);
 372     int (*to_can_run) (void);
 373     void (*to_notice_signals) (ptid_t ptid);
 374     int (*to_thread_alive) (ptid_t ptid);
 375     void (*to_find_new_threads) (void);
 376     char *(*to_pid_to_str) (ptid_t);
 377     char *(*to_extra_thread_info) (struct thread_info *);
 378     void (*to_stop) (void);
 379     void (*to_rcmd) (char *command, struct ui_file *output);
 380     struct symtab_and_line *(*to_enable_exception_callback) (enum
 381                                                              exception_event_kind,
 382                                                              int);
 383     struct exception_event_record *(*to_get_current_exception_event) (void);
 384     char *(*to_pid_to_exec_file) (int pid);
 385     enum strata to_stratum;
 386     int to_has_all_memory;
 387     int to_has_memory;
 388     int to_has_stack;
 389     int to_has_registers;
 390     int to_has_execution;
 391     int to_has_thread_control;  /* control thread execution */
 392     struct section_table
 393      *to_sections;
 394     struct section_table
 395      *to_sections_end;
 396     /* ASYNC target controls */
 397     int (*to_can_async_p) (void);
 398     int (*to_is_async_p) (void);
 399     void (*to_async) (void (*cb) (enum inferior_event_type, void *context),
 400                       void *context);
 401     int to_async_mask_value;
 402     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 403                                             unsigned long,
 404                                             int, int, int,
 405                                             void *),
 406                                    void *);
 407     char * (*to_make_corefile_notes) (bfd *, int *);
 408
 409     /* Return the thread-local address at OFFSET in the
 410        thread-local storage for the thread PTID and the shared library
 411        or executable file given by OBJFILE.  If that block of
 412        thread-local storage hasn't been allocated yet, this function
 413        may return an error.  */
 414     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 415                                               CORE_ADDR load_module_addr,
 416                                               CORE_ADDR offset);
 417
 418     /* Perform partial transfers on OBJECT.  See target_read_partial
 419        and target_write_partial for details of each variant.  One, and
 420        only one, of readbuf or writebuf must be non-NULL.  */
 421     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 422                                 enum target_object object, const char *annex,
 423                                 gdb_byte *readbuf, const gdb_byte *writebuf,
 424                                 ULONGEST offset, LONGEST len);
 425
 426     int to_magic;
 427     /* Need sub-structure for target machine related rather than comm related?
 428      */
 429   };
 430
 431 /* Magic number for checking ops size.  If a struct doesn't end with this
 432    number, somebody changed the declaration but didn't change all the
 433    places that initialize one.  */
 434
 435 #define OPS_MAGIC       3840
 436
 437 /* The ops structure for our "current" target process.  This should
 438    never be NULL.  If there is no target, it points to the dummy_target.  */
 439
 440 extern struct target_ops current_target;
 441
 442 /* Define easy words for doing these operations on our current target.  */
 443
 444 #define target_shortname        (current_target.to_shortname)
 445 #define target_longname         (current_target.to_longname)
 446
 447 /* Does whatever cleanup is required for a target that we are no
 448    longer going to be calling.  QUITTING indicates that GDB is exiting
 449    and should not get hung on an error (otherwise it is important to
 450    perform clean termination, even if it takes a while).  This routine
 451    is automatically always called when popping the target off the
 452    target stack (to_beneath is undefined).  Closing file descriptors
 453    and freeing all memory allocated memory are typical things it
 454    should do.  */
 455
 456 void target_close (struct target_ops *targ, int quitting);
 457
 458 /* Attaches to a process on the target side.  Arguments are as passed
 459    to the `attach' command by the user.  This routine can be called
 460    when the target is not on the target-stack, if the target_can_run
 461    routine returns 1; in that case, it must push itself onto the stack.
 462    Upon exit, the target should be ready for normal operations, and
 463    should be ready to deliver the status of the process immediately
 464    (without waiting) to an upcoming target_wait call.  */
 465
 466 #define target_attach(args, from_tty)   \
 467      (*current_target.to_attach) (args, from_tty)
 468
 469 /* The target_attach operation places a process under debugger control,
 470    and stops the process.
 471
 472    This operation provides a target-specific hook that allows the
 473    necessary bookkeeping to be performed after an attach completes.  */
 474 #define target_post_attach(pid) \
 475      (*current_target.to_post_attach) (pid)
 476
 477 /* Takes a program previously attached to and detaches it.
 478    The program may resume execution (some targets do, some don't) and will
 479    no longer stop on signals, etc.  We better not have left any breakpoints
 480    in the program or it'll die when it hits one.  ARGS is arguments
 481    typed by the user (e.g. a signal to send the process).  FROM_TTY
 482    says whether to be verbose or not.  */
 483
 484 extern void target_detach (char *, int);
 485
 486 /* Disconnect from the current target without resuming it (leaving it
 487    waiting for a debugger).  */
 488
 489 extern void target_disconnect (char *, int);
 490
 491 /* Resume execution of the target process PTID.  STEP says whether to
 492    single-step or to run free; SIGGNAL is the signal to be given to
 493    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 494    pass TARGET_SIGNAL_DEFAULT.  */
 495
 496 #define target_resume(ptid, step, siggnal)                              \
 497   do {                                                                  \
 498     dcache_invalidate(target_dcache);                                   \
 499     (*current_target.to_resume) (ptid, step, siggnal);                  \
 500   } while (0)
 501
 502 /* Wait for process pid to do something.  PTID = -1 to wait for any
 503    pid to do something.  Return pid of child, or -1 in case of error;
 504    store status through argument pointer STATUS.  Note that it is
 505    _NOT_ OK to throw_exception() out of target_wait() without popping
 506    the debugging target from the stack; GDB isn't prepared to get back
 507    to the prompt with a debugging target but without the frame cache,
 508    stop_pc, etc., set up.  */
 509
 510 #define target_wait(ptid, status)               \
 511      (*current_target.to_wait) (ptid, status)
 512
 513 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 514
 515 #define target_fetch_registers(regno)   \
 516      (*current_target.to_fetch_registers) (regno)
 517
 518 /* Store at least register REGNO, or all regs if REGNO == -1.
 519    It can store as many registers as it wants to, so target_prepare_to_store
 520    must have been previously called.  Calls error() if there are problems.  */
 521
 522 #define target_store_registers(regs)    \
 523      (*current_target.to_store_registers) (regs)
 524
 525 /* Get ready to modify the registers array.  On machines which store
 526    individual registers, this doesn't need to do anything.  On machines
 527    which store all the registers in one fell swoop, this makes sure
 528    that REGISTERS contains all the registers from the program being
 529    debugged.  */
 530
 531 #define target_prepare_to_store()       \
 532      (*current_target.to_prepare_to_store) ()
 533
 534 extern DCACHE *target_dcache;
 535
 536 extern int do_xfer_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len,
 537                            int write, struct mem_attrib *attrib);
 538
 539 extern int target_read_string (CORE_ADDR, char **, int, int *);
 540
 541 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
 542
 543 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 544                                 int len);
 545
 546 extern int xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 547                         struct mem_attrib *, struct target_ops *);
 548
 549 extern int child_xfer_memory (CORE_ADDR, gdb_byte *, int, int,
 550                               struct mem_attrib *, struct target_ops *);
 551
 552 /* Make a single attempt at transfering LEN bytes.  On a successful
 553    transfer, the number of bytes actually transfered is returned and
 554    ERR is set to 0.  When a transfer fails, -1 is returned (the number
 555    of bytes actually transfered is not defined) and ERR is set to a
 556    non-zero error indication.  */
 557
 558 extern int target_read_memory_partial (CORE_ADDR addr, gdb_byte *buf,
 559                                        int len, int *err);
 560
 561 extern int target_write_memory_partial (CORE_ADDR addr, gdb_byte *buf,
 562                                         int len, int *err);
 563
 564 extern char *child_pid_to_exec_file (int);
 565
 566 extern char *child_core_file_to_sym_file (char *);
 567
 568 #if defined(CHILD_POST_ATTACH)
 569 extern void child_post_attach (int);
 570 #endif
 571
 572 extern void child_post_startup_inferior (ptid_t);
 573
 574 extern void child_acknowledge_created_inferior (int);
 575
 576 extern void child_insert_fork_catchpoint (int);
 577
 578 extern int child_remove_fork_catchpoint (int);
 579
 580 extern void child_insert_vfork_catchpoint (int);
 581
 582 extern int child_remove_vfork_catchpoint (int);
 583
 584 extern void child_acknowledge_created_inferior (int);
 585
 586 extern int child_follow_fork (struct target_ops *, int);
 587
 588 extern void child_insert_exec_catchpoint (int);
 589
 590 extern int child_remove_exec_catchpoint (int);
 591
 592 extern int child_reported_exec_events_per_exec_call (void);
 593
 594 extern int child_has_exited (int, int, int *);
 595
 596 extern int child_thread_alive (ptid_t);
 597
 598 /* From infrun.c.  */
 599
 600 extern int inferior_has_forked (int pid, int *child_pid);
 601
 602 extern int inferior_has_vforked (int pid, int *child_pid);
 603
 604 extern int inferior_has_execd (int pid, char **execd_pathname);
 605
 606 /* From exec.c */
 607
 608 extern void print_section_info (struct target_ops *, bfd *);
 609
 610 /* Print a line about the current target.  */
 611
 612 #define target_files_info()     \
 613      (*current_target.to_files_info) (&current_target)
 614
 615 /* Insert a breakpoint at address ADDR in the target machine.  SAVE is
 616    a pointer to memory allocated for saving the target contents.  It
 617    is guaranteed by the caller to be long enough to save the number of
 618    breakpoint bytes indicated by BREAKPOINT_FROM_PC.  Result is 0 for
 619    success, or an errno value.  */
 620
 621 #define target_insert_breakpoint(addr, save)    \
 622      (*current_target.to_insert_breakpoint) (addr, save)
 623
 624 /* Remove a breakpoint at address ADDR in the target machine.
 625    SAVE is a pointer to the same save area
 626    that was previously passed to target_insert_breakpoint.
 627    Result is 0 for success, or an errno value.  */
 628
 629 #define target_remove_breakpoint(addr, save)    \
 630      (*current_target.to_remove_breakpoint) (addr, save)
 631
 632 /* Initialize the terminal settings we record for the inferior,
 633    before we actually run the inferior.  */
 634
 635 #define target_terminal_init() \
 636      (*current_target.to_terminal_init) ()
 637
 638 /* Put the inferior's terminal settings into effect.
 639    This is preparation for starting or resuming the inferior.  */
 640
 641 #define target_terminal_inferior() \
 642      (*current_target.to_terminal_inferior) ()
 643
 644 /* Put some of our terminal settings into effect,
 645    enough to get proper results from our output,
 646    but do not change into or out of RAW mode
 647    so that no input is discarded.
 648
 649    After doing this, either terminal_ours or terminal_inferior
 650    should be called to get back to a normal state of affairs.  */
 651
 652 #define target_terminal_ours_for_output() \
 653      (*current_target.to_terminal_ours_for_output) ()
 654
 655 /* Put our terminal settings into effect.
 656    First record the inferior's terminal settings
 657    so they can be restored properly later.  */
 658
 659 #define target_terminal_ours() \
 660      (*current_target.to_terminal_ours) ()
 661
 662 /* Save our terminal settings.
 663    This is called from TUI after entering or leaving the curses
 664    mode.  Since curses modifies our terminal this call is here
 665    to take this change into account.  */
 666
 667 #define target_terminal_save_ours() \
 668      (*current_target.to_terminal_save_ours) ()
 669
 670 /* Print useful information about our terminal status, if such a thing
 671    exists.  */
 672
 673 #define target_terminal_info(arg, from_tty) \
 674      (*current_target.to_terminal_info) (arg, from_tty)
 675
 676 /* Kill the inferior process.   Make it go away.  */
 677
 678 #define target_kill() \
 679      (*current_target.to_kill) ()
 680
 681 /* Load an executable file into the target process.  This is expected
 682    to not only bring new code into the target process, but also to
 683    update GDB's symbol tables to match.
 684
 685    ARG contains command-line arguments, to be broken down with
 686    buildargv ().  The first non-switch argument is the filename to
 687    load, FILE; the second is a number (as parsed by strtoul (..., ...,
 688    0)), which is an offset to apply to the load addresses of FILE's
 689    sections.  The target may define switches, or other non-switch
 690    arguments, as it pleases.  */
 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, FROM_TTY)  \
 712      (*current_target.to_create_inferior) (exec_file, args, env, (FROM_TTY))
 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 int target_follow_fork (int follow_child);
 759
 760 /* On some targets, we can catch an inferior exec event when it
 761    occurs.  These functions insert/remove an already-created
 762    catchpoint for such events.  */
 763
 764 #define target_insert_exec_catchpoint(pid) \
 765      (*current_target.to_insert_exec_catchpoint) (pid)
 766
 767 #define target_remove_exec_catchpoint(pid) \
 768      (*current_target.to_remove_exec_catchpoint) (pid)
 769
 770 /* Returns the number of exec events that are reported when a process
 771    invokes a flavor of the exec() system call on this target, if exec
 772    events are being reported.  */
 773
 774 #define target_reported_exec_events_per_exec_call() \
 775      (*current_target.to_reported_exec_events_per_exec_call) ()
 776
 777 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 778    exit code of PID, if any.  */
 779
 780 #define target_has_exited(pid,wait_status,exit_status) \
 781      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 782
 783 /* The debugger has completed a blocking wait() call.  There is now
 784    some process event that must be processed.  This function should
 785    be defined by those targets that require the debugger to perform
 786    cleanup or internal state changes in response to the process event.  */
 787
 788 /* The inferior process has died.  Do what is right.  */
 789
 790 #define target_mourn_inferior() \
 791      (*current_target.to_mourn_inferior) ()
 792
 793 /* Does target have enough data to do a run or attach command? */
 794
 795 #define target_can_run(t) \
 796      ((t)->to_can_run) ()
 797
 798 /* post process changes to signal handling in the inferior.  */
 799
 800 #define target_notice_signals(ptid) \
 801      (*current_target.to_notice_signals) (ptid)
 802
 803 /* Check to see if a thread is still alive.  */
 804
 805 #define target_thread_alive(ptid) \
 806      (*current_target.to_thread_alive) (ptid)
 807
 808 /* Query for new threads and add them to the thread list.  */
 809
 810 #define target_find_new_threads() \
 811      (*current_target.to_find_new_threads) (); \
 812
 813 /* Make target stop in a continuable fashion.  (For instance, under
 814    Unix, this should act like SIGSTOP).  This function is normally
 815    used by GUIs to implement a stop button.  */
 816
 817 #define target_stop current_target.to_stop
 818
 819 /* Send the specified COMMAND to the target's monitor
 820    (shell,interpreter) for execution.  The result of the query is
 821    placed in OUTBUF.  */
 822
 823 #define target_rcmd(command, outbuf) \
 824      (*current_target.to_rcmd) (command, outbuf)
 825
 826
 827 /* Get the symbol information for a breakpointable routine called when
 828    an exception event occurs.
 829    Intended mainly for C++, and for those
 830    platforms/implementations where such a callback mechanism is available,
 831    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 832    different mechanisms for debugging exceptions.  */
 833
 834 #define target_enable_exception_callback(kind, enable) \
 835      (*current_target.to_enable_exception_callback) (kind, enable)
 836
 837 /* Get the current exception event kind -- throw or catch, etc.  */
 838
 839 #define target_get_current_exception_event() \
 840      (*current_target.to_get_current_exception_event) ()
 841
 842 /* Does the target include all of memory, or only part of it?  This
 843    determines whether we look up the target chain for other parts of
 844    memory if this target can't satisfy a request.  */
 845
 846 #define target_has_all_memory   \
 847      (current_target.to_has_all_memory)
 848
 849 /* Does the target include memory?  (Dummy targets don't.)  */
 850
 851 #define target_has_memory       \
 852      (current_target.to_has_memory)
 853
 854 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 855    we start a process.)  */
 856
 857 #define target_has_stack        \
 858      (current_target.to_has_stack)
 859
 860 /* Does the target have registers?  (Exec files don't.)  */
 861
 862 #define target_has_registers    \
 863      (current_target.to_has_registers)
 864
 865 /* Does the target have execution?  Can we make it jump (through
 866    hoops), or pop its stack a few times?  FIXME: If this is to work that
 867    way, it needs to check whether an inferior actually exists.
 868    remote-udi.c and probably other targets can be the current target
 869    when the inferior doesn't actually exist at the moment.  Right now
 870    this just tells us whether this target is *capable* of execution.  */
 871
 872 #define target_has_execution    \
 873      (current_target.to_has_execution)
 874
 875 /* Can the target support the debugger control of thread execution?
 876    a) Can it lock the thread scheduler?
 877    b) Can it switch the currently running thread?  */
 878
 879 #define target_can_lock_scheduler \
 880      (current_target.to_has_thread_control & tc_schedlock)
 881
 882 #define target_can_switch_threads \
 883      (current_target.to_has_thread_control & tc_switch)
 884
 885 /* Can the target support asynchronous execution? */
 886 #define target_can_async_p() (current_target.to_can_async_p ())
 887
 888 /* Is the target in asynchronous execution mode? */
 889 #define target_is_async_p() (current_target.to_is_async_p())
 890
 891 /* Put the target in async mode with the specified callback function. */
 892 #define target_async(CALLBACK,CONTEXT) \
 893      (current_target.to_async((CALLBACK), (CONTEXT)))
 894
 895 /* This is to be used ONLY within call_function_by_hand(). It provides
 896    a workaround, to have inferior function calls done in sychronous
 897    mode, even though the target is asynchronous. After
 898    target_async_mask(0) is called, calls to target_can_async_p() will
 899    return FALSE , so that target_resume() will not try to start the
 900    target asynchronously. After the inferior stops, we IMMEDIATELY
 901    restore the previous nature of the target, by calling
 902    target_async_mask(1). After that, target_can_async_p() will return
 903    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 904
 905    FIXME ezannoni 1999-12-13: we won't need this once we move
 906    the turning async on and off to the single execution commands,
 907    from where it is done currently, in remote_resume().  */
 908
 909 #define target_async_mask_value \
 910      (current_target.to_async_mask_value)
 911
 912 extern int target_async_mask (int mask);
 913
 914 /* Converts a process id to a string.  Usually, the string just contains
 915    `process xyz', but on some systems it may contain
 916    `process xyz thread abc'.  */
 917
 918 #undef target_pid_to_str
 919 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
 920
 921 #ifndef target_tid_to_str
 922 #define target_tid_to_str(PID) \
 923      target_pid_to_str (PID)
 924 extern char *normal_pid_to_str (ptid_t ptid);
 925 #endif
 926
 927 /* Return a short string describing extra information about PID,
 928    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
 929    is okay.  */
 930
 931 #define target_extra_thread_info(TP) \
 932      (current_target.to_extra_thread_info (TP))
 933
 934 /*
 935  * New Objfile Event Hook:
 936  *
 937  * Sometimes a GDB component wants to get notified whenever a new
 938  * objfile is loaded.  Mainly this is used by thread-debugging
 939  * implementations that need to know when symbols for the target
 940  * thread implemenation are available.
 941  *
 942  * The old way of doing this is to define a macro 'target_new_objfile'
 943  * that points to the function that you want to be called on every
 944  * objfile/shlib load.
 945
 946    The new way is to grab the function pointer,
 947    'deprecated_target_new_objfile_hook', and point it to the function
 948    that you want to be called on every objfile/shlib load.
 949
 950    If multiple clients are willing to be cooperative, they can each
 951    save a pointer to the previous value of
 952    deprecated_target_new_objfile_hook before modifying it, and arrange
 953    for their function to call the previous function in the chain.  In
 954    that way, multiple clients can receive this notification (something
 955    like with signal handlers).  */
 956
 957 extern void (*deprecated_target_new_objfile_hook) (struct objfile *);
 958
 959 #ifndef target_pid_or_tid_to_str
 960 #define target_pid_or_tid_to_str(ID) \
 961      target_pid_to_str (ID)
 962 #endif
 963
 964 /* Attempts to find the pathname of the executable file
 965    that was run to create a specified process.
 966
 967    The process PID must be stopped when this operation is used.
 968
 969    If the executable file cannot be determined, NULL is returned.
 970
 971    Else, a pointer to a character string containing the pathname
 972    is returned.  This string should be copied into a buffer by
 973    the client if the string will not be immediately used, or if
 974    it must persist.  */
 975
 976 #define target_pid_to_exec_file(pid) \
 977      (current_target.to_pid_to_exec_file) (pid)
 978
 979 /*
 980  * Iterator function for target memory regions.
 981  * Calls a callback function once for each memory region 'mapped'
 982  * in the child process.  Defined as a simple macro rather than
 983  * as a function macro so that it can be tested for nullity.
 984  */
 985
 986 #define target_find_memory_regions(FUNC, DATA) \
 987      (current_target.to_find_memory_regions) (FUNC, DATA)
 988
 989 /*
 990  * Compose corefile .note section.
 991  */
 992
 993 #define target_make_corefile_notes(BFD, SIZE_P) \
 994      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
 995
 996 /* Thread-local values.  */
 997 #define target_get_thread_local_address \
 998     (current_target.to_get_thread_local_address)
 999 #define target_get_thread_local_address_p() \
1000     (target_get_thread_local_address != NULL)
1001
1002 /* Hook to call target dependent code just after inferior target process has
1003    started.  */
1004
1005 #ifndef TARGET_CREATE_INFERIOR_HOOK
1006 #define TARGET_CREATE_INFERIOR_HOOK(PID)
1007 #endif
1008
1009 /* Hardware watchpoint interfaces.  */
1010
1011 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1012    write).  */
1013
1014 #ifndef STOPPED_BY_WATCHPOINT
1015 #define STOPPED_BY_WATCHPOINT(w) \
1016    (*current_target.to_stopped_by_watchpoint) ()
1017 #endif
1018
1019 /* Non-zero if we have continuable watchpoints  */
1020
1021 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1022 #define HAVE_CONTINUABLE_WATCHPOINT \
1023    (current_target.to_have_continuable_watchpoint)
1024 #endif
1025
1026 /* Provide defaults for hardware watchpoint functions.  */
1027
1028 /* If the *_hw_beakpoint functions have not been defined
1029    elsewhere use the definitions in the target vector.  */
1030
1031 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1032    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1033    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1034    (including this one?).  OTHERTYPE is who knows what...  */
1035
1036 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1037 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1038  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1039 #endif
1040
1041 #ifndef TARGET_REGION_OK_FOR_HW_WATCHPOINT
1042 #define TARGET_REGION_OK_FOR_HW_WATCHPOINT(addr, len) \
1043     (*current_target.to_region_ok_for_hw_watchpoint) (addr, len)
1044 #endif
1045
1046
1047 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1048    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1049    success, non-zero for failure.  */
1050
1051 #ifndef target_insert_watchpoint
1052 #define target_insert_watchpoint(addr, len, type)       \
1053      (*current_target.to_insert_watchpoint) (addr, len, type)
1054
1055 #define target_remove_watchpoint(addr, len, type)       \
1056      (*current_target.to_remove_watchpoint) (addr, len, type)
1057 #endif
1058
1059 #ifndef target_insert_hw_breakpoint
1060 #define target_insert_hw_breakpoint(addr, save) \
1061      (*current_target.to_insert_hw_breakpoint) (addr, save)
1062
1063 #define target_remove_hw_breakpoint(addr, save) \
1064      (*current_target.to_remove_hw_breakpoint) (addr, save)
1065 #endif
1066
1067 extern int target_stopped_data_address_p (struct target_ops *);
1068
1069 #ifndef target_stopped_data_address
1070 #define target_stopped_data_address(target, x) \
1071     (*target.to_stopped_data_address) (target, x)
1072 #else
1073 /* Horrible hack to get around existing macros :-(.  */
1074 #define target_stopped_data_address_p(CURRENT_TARGET) (1)
1075 #endif
1076
1077 /* This will only be defined by a target that supports catching vfork events,
1078    such as HP-UX.
1079
1080    On some targets (such as HP-UX 10.20 and earlier), resuming a newly vforked
1081    child process after it has exec'd, causes the parent process to resume as
1082    well.  To prevent the parent from running spontaneously, such targets should
1083    define this to a function that prevents that from happening.  */
1084 #if !defined(ENSURE_VFORKING_PARENT_REMAINS_STOPPED)
1085 #define ENSURE_VFORKING_PARENT_REMAINS_STOPPED(PID) (0)
1086 #endif
1087
1088 /* This will only be defined by a target that supports catching vfork events,
1089    such as HP-UX.
1090
1091    On some targets (such as HP-UX 10.20 and earlier), a newly vforked child
1092    process must be resumed when it delivers its exec event, before the parent
1093    vfork event will be delivered to us.  */
1094
1095 #if !defined(RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK)
1096 #define RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK() (0)
1097 #endif
1098
1099 /* Routines for maintenance of the target structures...
1100
1101    add_target:   Add a target to the list of all possible targets.
1102
1103    push_target:  Make this target the top of the stack of currently used
1104    targets, within its particular stratum of the stack.  Result
1105    is 0 if now atop the stack, nonzero if not on top (maybe
1106    should warn user).
1107
1108    unpush_target: Remove this from the stack of currently used targets,
1109    no matter where it is on the list.  Returns 0 if no
1110    change, 1 if removed from stack.
1111
1112    pop_target:   Remove the top thing on the stack of current targets.  */
1113
1114 extern void add_target (struct target_ops *);
1115
1116 extern int push_target (struct target_ops *);
1117
1118 extern int unpush_target (struct target_ops *);
1119
1120 extern void target_preopen (int);
1121
1122 extern void pop_target (void);
1123
1124 /* Struct section_table maps address ranges to file sections.  It is
1125    mostly used with BFD files, but can be used without (e.g. for handling
1126    raw disks, or files not in formats handled by BFD).  */
1127
1128 struct section_table
1129   {
1130     CORE_ADDR addr;             /* Lowest address in section */
1131     CORE_ADDR endaddr;          /* 1+highest address in section */
1132
1133     struct bfd_section *the_bfd_section;
1134
1135     bfd *bfd;                   /* BFD file pointer */
1136   };
1137
1138 /* Return the "section" containing the specified address.  */
1139 struct section_table *target_section_by_addr (struct target_ops *target,
1140                                               CORE_ADDR addr);
1141
1142
1143 /* From mem-break.c */
1144
1145 extern int memory_remove_breakpoint (CORE_ADDR, gdb_byte *);
1146
1147 extern int memory_insert_breakpoint (CORE_ADDR, gdb_byte *);
1148
1149 extern int default_memory_remove_breakpoint (CORE_ADDR, gdb_byte *);
1150
1151 extern int default_memory_insert_breakpoint (CORE_ADDR, gdb_byte *);
1152
1153
1154 /* From target.c */
1155
1156 extern void initialize_targets (void);
1157
1158 extern void noprocess (void);
1159
1160 extern void find_default_attach (char *, int);
1161
1162 extern void find_default_create_inferior (char *, char *, char **, int);
1163
1164 extern struct target_ops *find_run_target (void);
1165
1166 extern struct target_ops *find_core_target (void);
1167
1168 extern struct target_ops *find_target_beneath (struct target_ops *);
1169
1170 extern int target_resize_to_sections (struct target_ops *target,
1171                                       int num_added);
1172
1173 extern void remove_target_sections (bfd *abfd);
1174
1175 \f
1176 /* Stuff that should be shared among the various remote targets.  */
1177
1178 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1179    information (higher values, more information).  */
1180 extern int remote_debug;
1181
1182 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1183 extern int baud_rate;
1184 /* Timeout limit for response from target. */
1185 extern int remote_timeout;
1186
1187 \f
1188 /* Functions for helping to write a native target.  */
1189
1190 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1191 extern void store_waitstatus (struct target_waitstatus *, int);
1192
1193 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1194    targ_signal SIGNO has an equivalent ``host'' representation.  */
1195 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1196    to the shorter target_signal_p() because it is far less ambigious.
1197    In this context ``target_signal'' refers to GDB's internal
1198    representation of the target's set of signals while ``host signal''
1199    refers to the target operating system's signal.  Confused?  */
1200
1201 extern int target_signal_to_host_p (enum target_signal signo);
1202
1203 /* Convert between host signal numbers and enum target_signal's.
1204    target_signal_to_host() returns 0 and prints a warning() on GDB's
1205    console if SIGNO has no equivalent host representation.  */
1206 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1207    refering to the target operating system's signal numbering.
1208    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1209    gdb_signal'' would probably be better as it is refering to GDB's
1210    internal representation of a target operating system's signal.  */
1211
1212 extern enum target_signal target_signal_from_host (int);
1213 extern int target_signal_to_host (enum target_signal);
1214
1215 /* Convert from a number used in a GDB command to an enum target_signal.  */
1216 extern enum target_signal target_signal_from_command (int);
1217
1218 /* Any target can call this to switch to remote protocol (in remote.c). */
1219 extern void push_remote_target (char *name, int from_tty);
1220 \f
1221 /* Imported from machine dependent code */
1222
1223 /* Blank target vector entries are initialized to target_ignore. */
1224 void target_ignore (void);
1225
1226 extern struct target_ops deprecated_child_ops;
1227
1228 #endif /* !defined (TARGET_H) */