gdb/target.h

   1 /* Interface between GDB and target environments, including files and processes
   2
   3    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   4    1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
   5
   6    Contributed by Cygnus Support.  Written by John Gilmore.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 59 Temple Place - Suite 330,
  23    Boston, MA 02111-1307, USA.  */
  24
  25 #if !defined (TARGET_H)
  26 #define TARGET_H
  27
  28 struct objfile;
  29 struct ui_file;
  30 struct mem_attrib;
  31 struct target_ops;
  32
  33 /* This include file defines the interface between the main part
  34    of the debugger, and the part which is target-specific, or
  35    specific to the communications interface between us and the
  36    target.
  37
  38    A TARGET is an interface between the debugger and a particular
  39    kind of file or process.  Targets can be STACKED in STRATA,
  40    so that more than one target can potentially respond to a request.
  41    In particular, memory accesses will walk down the stack of targets
  42    until they find a target that is interested in handling that particular
  43    address.  STRATA are artificial boundaries on the stack, within
  44    which particular kinds of targets live.  Strata exist so that
  45    people don't get confused by pushing e.g. a process target and then
  46    a file target, and wondering why they can't see the current values
  47    of variables any more (the file target is handling them and they
  48    never get to the process target).  So when you push a file target,
  49    it goes into the file stratum, which is always below the process
  50    stratum.  */
  51
  52 #include "bfd.h"
  53 #include "symtab.h"
  54 #include "dcache.h"
  55 #include "memattr.h"
  56
  57 enum strata
  58   {
  59     dummy_stratum,              /* The lowest of the low */
  60     file_stratum,               /* Executable files, etc */
  61     core_stratum,               /* Core dump files */
  62     download_stratum,           /* Downloading of remote targets */
  63     process_stratum,            /* Executing processes */
  64     thread_stratum              /* Executing threads */
  65   };
  66
  67 enum thread_control_capabilities
  68   {
  69     tc_none = 0,                /* Default: can't control thread execution.  */
  70     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  71     tc_switch = 2               /* Can switch the running thread on demand.  */
  72   };
  73
  74 /* Stuff for target_wait.  */
  75
  76 /* Generally, what has the program done?  */
  77 enum target_waitkind
  78   {
  79     /* The program has exited.  The exit status is in value.integer.  */
  80     TARGET_WAITKIND_EXITED,
  81
  82     /* The program has stopped with a signal.  Which signal is in
  83        value.sig.  */
  84     TARGET_WAITKIND_STOPPED,
  85
  86     /* The program has terminated with a signal.  Which signal is in
  87        value.sig.  */
  88     TARGET_WAITKIND_SIGNALLED,
  89
  90     /* The program is letting us know that it dynamically loaded something
  91        (e.g. it called load(2) on AIX).  */
  92     TARGET_WAITKIND_LOADED,
  93
  94     /* The program has forked.  A "related" process' ID is in
  95        value.related_pid.  I.e., if the child forks, value.related_pid
  96        is the parent's ID.  */
  97
  98     TARGET_WAITKIND_FORKED,
  99
 100     /* The program has vforked.  A "related" process's ID is in
 101        value.related_pid.  */
 102
 103     TARGET_WAITKIND_VFORKED,
 104
 105     /* The program has exec'ed a new executable file.  The new file's
 106        pathname is pointed to by value.execd_pathname.  */
 107
 108     TARGET_WAITKIND_EXECD,
 109
 110     /* The program has entered or returned from a system call.  On
 111        HP-UX, this is used in the hardware watchpoint implementation.
 112        The syscall's unique integer ID number is in value.syscall_id */
 113
 114     TARGET_WAITKIND_SYSCALL_ENTRY,
 115     TARGET_WAITKIND_SYSCALL_RETURN,
 116
 117     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 118        within target_wait, but I'm not sure target_wait should be resuming the
 119        inferior.  */
 120     TARGET_WAITKIND_SPURIOUS,
 121
 122     /* An event has occured, but we should wait again.
 123        Remote_async_wait() returns this when there is an event
 124        on the inferior, but the rest of the world is not interested in
 125        it. The inferior has not stopped, but has just sent some output
 126        to the console, for instance. In this case, we want to go back
 127        to the event loop and wait there for another event from the
 128        inferior, rather than being stuck in the remote_async_wait()
 129        function. This way the event loop is responsive to other events,
 130        like for instance the user typing.  */
 131     TARGET_WAITKIND_IGNORE
 132   };
 133
 134 struct target_waitstatus
 135   {
 136     enum target_waitkind kind;
 137
 138     /* Forked child pid, execd pathname, exit status or signal number.  */
 139     union
 140       {
 141         int integer;
 142         enum target_signal sig;
 143         int related_pid;
 144         char *execd_pathname;
 145         int syscall_id;
 146       }
 147     value;
 148   };
 149
 150 /* Possible types of events that the inferior handler will have to
 151    deal with.  */
 152 enum inferior_event_type
 153   {
 154     /* There is a request to quit the inferior, abandon it.  */
 155     INF_QUIT_REQ,
 156     /* Process a normal inferior event which will result in target_wait
 157        being called.  */
 158     INF_REG_EVENT,
 159     /* Deal with an error on the inferior.  */
 160     INF_ERROR,
 161     /* We are called because a timer went off.  */
 162     INF_TIMER,
 163     /* We are called to do stuff after the inferior stops.  */
 164     INF_EXEC_COMPLETE,
 165     /* We are called to do some stuff after the inferior stops, but we
 166        are expected to reenter the proceed() and
 167        handle_inferior_event() functions. This is used only in case of
 168        'step n' like commands.  */
 169     INF_EXEC_CONTINUE
 170   };
 171
 172 /* Return the string for a signal.  */
 173 extern char *target_signal_to_string (enum target_signal);
 174
 175 /* Return the name (SIGHUP, etc.) for a signal.  */
 176 extern char *target_signal_to_name (enum target_signal);
 177
 178 /* Given a name (SIGHUP, etc.), return its signal.  */
 179 enum target_signal target_signal_from_name (char *);
 180 \f
 181 /* Request the transfer of up to LEN 8-bit bytes of the target's
 182    OBJECT.  The OFFSET, for a seekable object, specifies the starting
 183    point.  The ANNEX can be used to provide additional data-specific
 184    information to the target.
 185
 186    Return the number of bytes actually transfered, zero when no
 187    further transfer is possible, and -1 when the transfer is not
 188    supported.
 189
 190    NOTE: cagney/2003-10-17: The current interface does not support a
 191    "retry" mechanism.  Instead it assumes that at least one byte will
 192    be transfered on each call.
 193
 194    NOTE: cagney/2003-10-17: The current interface can lead to
 195    fragmented transfers.  Lower target levels should not implement
 196    hacks, such as enlarging the transfer, in an attempt to compensate
 197    for this.  Instead, the target stack should be extended so that it
 198    implements supply/collect methods and a look-aside object cache.
 199    With that available, the lowest target can safely and freely "push"
 200    data up the stack.
 201
 202    NOTE: cagney/2003-10-17: Unlike the old query and the memory
 203    transfer mechanisms, these methods are explicitly parameterized by
 204    the target that it should be applied to.
 205
 206    NOTE: cagney/2003-10-17: Just like the old query and memory xfer
 207    methods, these new methods perform partial transfers.  The only
 208    difference is that these new methods thought to include "partial"
 209    in the name.  The old code's failure to do this lead to much
 210    confusion and duplication of effort as each target object attempted
 211    to locally take responsibility for something it didn't have to
 212    worry about.
 213
 214    NOTE: cagney/2003-10-17: With a TARGET_OBJECT_KOD object, for
 215    backward compatibility with the "target_query" method that this
 216    replaced, when OFFSET and LEN are both zero, return the "minimum"
 217    buffer size.  See "remote.c" for further information.  */
 218
 219 enum target_object
 220 {
 221   /* Kernel Object Display transfer.  See "kod.c" and "remote.c".  */
 222   TARGET_OBJECT_KOD,
 223   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 224   TARGET_OBJECT_AVR,
 225   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 226   TARGET_OBJECT_MEMORY
 227   /* Possible future ojbects: TARGET_OJBECT_FILE, TARGET_OBJECT_PROC,
 228      TARGET_OBJECT_AUXV, ...  */
 229 };
 230
 231 extern LONGEST target_read_partial (struct target_ops *ops,
 232                                     enum target_object object,
 233                                     const char *annex, void *buf,
 234                                     ULONGEST offset, LONGEST len);
 235
 236 extern LONGEST target_write_partial (struct target_ops *ops,
 237                                      enum target_object object,
 238                                      const char *annex, const void *buf,
 239                                      ULONGEST offset, LONGEST len);
 240
 241 /* Wrappers to perform the full transfer.  */
 242 extern LONGEST target_read (struct target_ops *ops,
 243                             enum target_object object,
 244                             const char *annex, void *buf,
 245                             ULONGEST offset, LONGEST len);
 246
 247 extern LONGEST target_write (struct target_ops *ops,
 248                              enum target_object object,
 249                              const char *annex, const void *buf,
 250                              ULONGEST offset, LONGEST len);
 251
 252 /* Wrappers to target read/write that perform memory transfers.  They
 253    throw an error if the memory transfer fails.
 254
 255    NOTE: cagney/2003-10-23: The naming schema is lifted from
 256    "frame.h".  The parameter order is lifted from get_frame_memory,
 257    which in turn lifted it from read_memory.  */
 258
 259 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 260                                void *buf, LONGEST len);
 261 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 262                                             CORE_ADDR addr, int len);
 263 \f
 264
 265 /* If certain kinds of activity happen, target_wait should perform
 266    callbacks.  */
 267 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 268    on TARGET_ACTIVITY_FD.  */
 269 extern int target_activity_fd;
 270 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 271 extern int (*target_activity_function) (void);
 272 \f
 273 struct thread_info;             /* fwd decl for parameter list below: */
 274
 275 struct target_ops
 276   {
 277     struct target_ops *beneath; /* To the target under this one.  */
 278     char *to_shortname;         /* Name this target type */
 279     char *to_longname;          /* Name for printing */
 280     char *to_doc;               /* Documentation.  Does not include trailing
 281                                    newline, and starts with a one-line descrip-
 282                                    tion (probably similar to to_longname).  */
 283     /* The open routine takes the rest of the parameters from the
 284        command, and (if successful) pushes a new target onto the
 285        stack.  Targets should supply this routine, if only to provide
 286        an error message.  */
 287     void (*to_open) (char *, int);
 288     /* Old targets with a static target vector provide "to_close".
 289        New re-entrant targets provide "to_xclose" and that is expected
 290        to xfree everything (including the "struct target_ops").  */
 291     void (*to_xclose) (struct target_ops *targ, int quitting);
 292     void (*to_close) (int);
 293     void (*to_attach) (char *, int);
 294     void (*to_post_attach) (int);
 295     void (*to_detach) (char *, int);
 296     void (*to_disconnect) (char *, int);
 297     void (*to_resume) (ptid_t, int, enum target_signal);
 298     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 299     void (*to_post_wait) (ptid_t, int);
 300     void (*to_fetch_registers) (int);
 301     void (*to_store_registers) (int);
 302     void (*to_prepare_to_store) (void);
 303
 304     /* Transfer LEN bytes of memory between GDB address MYADDR and
 305        target address MEMADDR.  If WRITE, transfer them to the target, else
 306        transfer them from the target.  TARGET is the target from which we
 307        get this function.
 308
 309        Return value, N, is one of the following:
 310
 311        0 means that we can't handle this.  If errno has been set, it is the
 312        error which prevented us from doing it (FIXME: What about bfd_error?).
 313
 314        positive (call it N) means that we have transferred N bytes
 315        starting at MEMADDR.  We might be able to handle more bytes
 316        beyond this length, but no promises.
 317
 318        negative (call its absolute value N) means that we cannot
 319        transfer right at MEMADDR, but we could transfer at least
 320        something at MEMADDR + N.  */
 321
 322     int (*to_xfer_memory) (CORE_ADDR memaddr, char *myaddr,
 323                            int len, int write,
 324                            struct mem_attrib *attrib,
 325                            struct target_ops *target);
 326
 327     void (*to_files_info) (struct target_ops *);
 328     int (*to_insert_breakpoint) (CORE_ADDR, char *);
 329     int (*to_remove_breakpoint) (CORE_ADDR, char *);
 330     int (*to_can_use_hw_breakpoint) (int, int, int);
 331     int (*to_insert_hw_breakpoint) (CORE_ADDR, char *);
 332     int (*to_remove_hw_breakpoint) (CORE_ADDR, char *);
 333     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 334     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 335     int (*to_stopped_by_watchpoint) (void);
 336     int to_have_continuable_watchpoint;
 337     CORE_ADDR (*to_stopped_data_address) (void);
 338     int (*to_region_size_ok_for_hw_watchpoint) (int);
 339     void (*to_terminal_init) (void);
 340     void (*to_terminal_inferior) (void);
 341     void (*to_terminal_ours_for_output) (void);
 342     void (*to_terminal_ours) (void);
 343     void (*to_terminal_save_ours) (void);
 344     void (*to_terminal_info) (char *, int);
 345     void (*to_kill) (void);
 346     void (*to_load) (char *, int);
 347     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 348     void (*to_create_inferior) (char *, char *, char **);
 349     void (*to_post_startup_inferior) (ptid_t);
 350     void (*to_acknowledge_created_inferior) (int);
 351     int (*to_insert_fork_catchpoint) (int);
 352     int (*to_remove_fork_catchpoint) (int);
 353     int (*to_insert_vfork_catchpoint) (int);
 354     int (*to_remove_vfork_catchpoint) (int);
 355     int (*to_follow_fork) (int);
 356     int (*to_insert_exec_catchpoint) (int);
 357     int (*to_remove_exec_catchpoint) (int);
 358     int (*to_reported_exec_events_per_exec_call) (void);
 359     int (*to_has_exited) (int, int, int *);
 360     void (*to_mourn_inferior) (void);
 361     int (*to_can_run) (void);
 362     void (*to_notice_signals) (ptid_t ptid);
 363     int (*to_thread_alive) (ptid_t ptid);
 364     void (*to_find_new_threads) (void);
 365     char *(*to_pid_to_str) (ptid_t);
 366     char *(*to_extra_thread_info) (struct thread_info *);
 367     void (*to_stop) (void);
 368     void (*to_rcmd) (char *command, struct ui_file *output);
 369     struct symtab_and_line *(*to_enable_exception_callback) (enum
 370                                                              exception_event_kind,
 371                                                              int);
 372     struct exception_event_record *(*to_get_current_exception_event) (void);
 373     char *(*to_pid_to_exec_file) (int pid);
 374     enum strata to_stratum;
 375     int to_has_all_memory;
 376     int to_has_memory;
 377     int to_has_stack;
 378     int to_has_registers;
 379     int to_has_execution;
 380     int to_has_thread_control;  /* control thread execution */
 381     struct section_table
 382      *to_sections;
 383     struct section_table
 384      *to_sections_end;
 385     /* ASYNC target controls */
 386     int (*to_can_async_p) (void);
 387     int (*to_is_async_p) (void);
 388     void (*to_async) (void (*cb) (enum inferior_event_type, void *context),
 389                       void *context);
 390     int to_async_mask_value;
 391     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 392                                             unsigned long,
 393                                             int, int, int,
 394                                             void *),
 395                                    void *);
 396     char * (*to_make_corefile_notes) (bfd *, int *);
 397
 398     /* Return the thread-local address at OFFSET in the
 399        thread-local storage for the thread PTID and the shared library
 400        or executable file given by OBJFILE.  If that block of
 401        thread-local storage hasn't been allocated yet, this function
 402        may return an error.  */
 403     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 404                                               struct objfile *objfile,
 405                                               CORE_ADDR offset);
 406
 407     /* Perform partial transfers on OBJECT.  See target_read_partial
 408        and target_write_partial for details of each variant.  One, and
 409        only one, of readbuf or writebuf must be non-NULL.  */
 410     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 411                                 enum target_object object,
 412                                 const char *annex, const void *writebuf,
 413                                 void *readbuf, ULONGEST offset, LONGEST len);
 414
 415     int to_magic;
 416     /* Need sub-structure for target machine related rather than comm related?
 417      */
 418   };
 419
 420 /* Magic number for checking ops size.  If a struct doesn't end with this
 421    number, somebody changed the declaration but didn't change all the
 422    places that initialize one.  */
 423
 424 #define OPS_MAGIC       3840
 425
 426 /* The ops structure for our "current" target process.  This should
 427    never be NULL.  If there is no target, it points to the dummy_target.  */
 428
 429 extern struct target_ops current_target;
 430
 431 /* Define easy words for doing these operations on our current target.  */
 432
 433 #define target_shortname        (current_target.to_shortname)
 434 #define target_longname         (current_target.to_longname)
 435
 436 /* Does whatever cleanup is required for a target that we are no
 437    longer going to be calling.  QUITTING indicates that GDB is exiting
 438    and should not get hung on an error (otherwise it is important to
 439    perform clean termination, even if it takes a while).  This routine
 440    is automatically always called when popping the target off the
 441    target stack (to_beneath is undefined).  Closing file descriptors
 442    and freeing all memory allocated memory are typical things it
 443    should do.  */
 444
 445 void target_close (struct target_ops *targ, int quitting);
 446
 447 /* Attaches to a process on the target side.  Arguments are as passed
 448    to the `attach' command by the user.  This routine can be called
 449    when the target is not on the target-stack, if the target_can_run
 450    routine returns 1; in that case, it must push itself onto the stack.
 451    Upon exit, the target should be ready for normal operations, and
 452    should be ready to deliver the status of the process immediately
 453    (without waiting) to an upcoming target_wait call.  */
 454
 455 #define target_attach(args, from_tty)   \
 456      (*current_target.to_attach) (args, from_tty)
 457
 458 /* The target_attach operation places a process under debugger control,
 459    and stops the process.
 460
 461    This operation provides a target-specific hook that allows the
 462    necessary bookkeeping to be performed after an attach completes.  */
 463 #define target_post_attach(pid) \
 464      (*current_target.to_post_attach) (pid)
 465
 466 /* Takes a program previously attached to and detaches it.
 467    The program may resume execution (some targets do, some don't) and will
 468    no longer stop on signals, etc.  We better not have left any breakpoints
 469    in the program or it'll die when it hits one.  ARGS is arguments
 470    typed by the user (e.g. a signal to send the process).  FROM_TTY
 471    says whether to be verbose or not.  */
 472
 473 extern void target_detach (char *, int);
 474
 475 /* Disconnect from the current target without resuming it (leaving it
 476    waiting for a debugger).  */
 477
 478 extern void target_disconnect (char *, int);
 479
 480 /* Resume execution of the target process PTID.  STEP says whether to
 481    single-step or to run free; SIGGNAL is the signal to be given to
 482    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 483    pass TARGET_SIGNAL_DEFAULT.  */
 484
 485 #define target_resume(ptid, step, siggnal)                              \
 486   do {                                                                  \
 487     dcache_invalidate(target_dcache);                                   \
 488     (*current_target.to_resume) (ptid, step, siggnal);                  \
 489   } while (0)
 490
 491 /* Wait for process pid to do something.  PTID = -1 to wait for any
 492    pid to do something.  Return pid of child, or -1 in case of error;
 493    store status through argument pointer STATUS.  Note that it is
 494    _NOT_ OK to throw_exception() out of target_wait() without popping
 495    the debugging target from the stack; GDB isn't prepared to get back
 496    to the prompt with a debugging target but without the frame cache,
 497    stop_pc, etc., set up.  */
 498
 499 #define target_wait(ptid, status)               \
 500      (*current_target.to_wait) (ptid, status)
 501
 502 /* The target_wait operation waits for a process event to occur, and
 503    thereby stop the process.
 504
 505    On some targets, certain events may happen in sequences.  gdb's
 506    correct response to any single event of such a sequence may require
 507    knowledge of what earlier events in the sequence have been seen.
 508
 509    This operation provides a target-specific hook that allows the
 510    necessary bookkeeping to be performed to track such sequences.  */
 511
 512 #define target_post_wait(ptid, status) \
 513      (*current_target.to_post_wait) (ptid, status)
 514
 515 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 516
 517 #define target_fetch_registers(regno)   \
 518      (*current_target.to_fetch_registers) (regno)
 519
 520 /* Store at least register REGNO, or all regs if REGNO == -1.
 521    It can store as many registers as it wants to, so target_prepare_to_store
 522    must have been previously called.  Calls error() if there are problems.  */
 523
 524 #define target_store_registers(regs)    \
 525      (*current_target.to_store_registers) (regs)
 526
 527 /* Get ready to modify the registers array.  On machines which store
 528    individual registers, this doesn't need to do anything.  On machines
 529    which store all the registers in one fell swoop, this makes sure
 530    that REGISTERS contains all the registers from the program being
 531    debugged.  */
 532
 533 #define target_prepare_to_store()       \
 534      (*current_target.to_prepare_to_store) ()
 535
 536 extern DCACHE *target_dcache;
 537
 538 extern int do_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
 539                            struct mem_attrib *attrib);
 540
 541 extern int target_read_string (CORE_ADDR, char **, int, int *);
 542
 543 extern int target_read_memory (CORE_ADDR memaddr, char *myaddr, int len);
 544
 545 extern int target_write_memory (CORE_ADDR memaddr, char *myaddr, int len);
 546
 547 extern int xfer_memory (CORE_ADDR, char *, int, int,
 548                         struct mem_attrib *, struct target_ops *);
 549
 550 extern int child_xfer_memory (CORE_ADDR, char *, 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, char *buf, int len,
 560                                        int *err);
 561
 562 extern int target_write_memory_partial (CORE_ADDR addr, char *buf, int len,
 563                                         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_wait (ptid_t, int);
 574
 575 extern void child_post_startup_inferior (ptid_t);
 576
 577 extern void child_acknowledge_created_inferior (int);
 578
 579 extern int child_insert_fork_catchpoint (int);
 580
 581 extern int child_remove_fork_catchpoint (int);
 582
 583 extern int child_insert_vfork_catchpoint (int);
 584
 585 extern int child_remove_vfork_catchpoint (int);
 586
 587 extern void child_acknowledge_created_inferior (int);
 588
 589 extern int child_follow_fork (int);
 590
 591 extern int child_insert_exec_catchpoint (int);
 592
 593 extern int child_remove_exec_catchpoint (int);
 594
 595 extern int child_reported_exec_events_per_exec_call (void);
 596
 597 extern int child_has_exited (int, int, int *);
 598
 599 extern int child_thread_alive (ptid_t);
 600
 601 /* From infrun.c.  */
 602
 603 extern int inferior_has_forked (int pid, int *child_pid);
 604
 605 extern int inferior_has_vforked (int pid, int *child_pid);
 606
 607 extern int inferior_has_execd (int pid, char **execd_pathname);
 608
 609 /* From exec.c */
 610
 611 extern void print_section_info (struct target_ops *, bfd *);
 612
 613 /* Print a line about the current target.  */
 614
 615 #define target_files_info()     \
 616      (*current_target.to_files_info) (&current_target)
 617
 618 /* Insert a breakpoint at address ADDR in the target machine.  SAVE is
 619    a pointer to memory allocated for saving the target contents.  It
 620    is guaranteed by the caller to be long enough to save the number of
 621    breakpoint bytes indicated by BREAKPOINT_FROM_PC.  Result is 0 for
 622    success, or an errno value.  */
 623
 624 #define target_insert_breakpoint(addr, save)    \
 625      (*current_target.to_insert_breakpoint) (addr, save)
 626
 627 /* Remove a breakpoint at address ADDR in the target machine.
 628    SAVE is a pointer to the same save area
 629    that was previously passed to target_insert_breakpoint.
 630    Result is 0 for success, or an errno value.  */
 631
 632 #define target_remove_breakpoint(addr, save)    \
 633      (*current_target.to_remove_breakpoint) (addr, save)
 634
 635 /* Initialize the terminal settings we record for the inferior,
 636    before we actually run the inferior.  */
 637
 638 #define target_terminal_init() \
 639      (*current_target.to_terminal_init) ()
 640
 641 /* Put the inferior's terminal settings into effect.
 642    This is preparation for starting or resuming the inferior.  */
 643
 644 #define target_terminal_inferior() \
 645      (*current_target.to_terminal_inferior) ()
 646
 647 /* Put some of our terminal settings into effect,
 648    enough to get proper results from our output,
 649    but do not change into or out of RAW mode
 650    so that no input is discarded.
 651
 652    After doing this, either terminal_ours or terminal_inferior
 653    should be called to get back to a normal state of affairs.  */
 654
 655 #define target_terminal_ours_for_output() \
 656      (*current_target.to_terminal_ours_for_output) ()
 657
 658 /* Put our terminal settings into effect.
 659    First record the inferior's terminal settings
 660    so they can be restored properly later.  */
 661
 662 #define target_terminal_ours() \
 663      (*current_target.to_terminal_ours) ()
 664
 665 /* Save our terminal settings.
 666    This is called from TUI after entering or leaving the curses
 667    mode.  Since curses modifies our terminal this call is here
 668    to take this change into account.  */
 669
 670 #define target_terminal_save_ours() \
 671      (*current_target.to_terminal_save_ours) ()
 672
 673 /* Print useful information about our terminal status, if such a thing
 674    exists.  */
 675
 676 #define target_terminal_info(arg, from_tty) \
 677      (*current_target.to_terminal_info) (arg, from_tty)
 678
 679 /* Kill the inferior process.   Make it go away.  */
 680
 681 #define target_kill() \
 682      (*current_target.to_kill) ()
 683
 684 /* Load an executable file into the target process.  This is expected
 685    to not only bring new code into the target process, but also to
 686    update GDB's symbol tables to match.  */
 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)    \
 708      (*current_target.to_create_inferior) (exec_file, args, env)
 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 #define target_follow_fork(follow_child) \
 755      (*current_target.to_follow_fork) (follow_child)
 756
 757 /* On some targets, we can catch an inferior exec event when it
 758    occurs.  These functions insert/remove an already-created
 759    catchpoint for such events.  */
 760
 761 #define target_insert_exec_catchpoint(pid) \
 762      (*current_target.to_insert_exec_catchpoint) (pid)
 763
 764 #define target_remove_exec_catchpoint(pid) \
 765      (*current_target.to_remove_exec_catchpoint) (pid)
 766
 767 /* Returns the number of exec events that are reported when a process
 768    invokes a flavor of the exec() system call on this target, if exec
 769    events are being reported.  */
 770
 771 #define target_reported_exec_events_per_exec_call() \
 772      (*current_target.to_reported_exec_events_per_exec_call) ()
 773
 774 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 775    exit code of PID, if any.  */
 776
 777 #define target_has_exited(pid,wait_status,exit_status) \
 778      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 779
 780 /* The debugger has completed a blocking wait() call.  There is now
 781    some process event that must be processed.  This function should
 782    be defined by those targets that require the debugger to perform
 783    cleanup or internal state changes in response to the process event.  */
 784
 785 /* The inferior process has died.  Do what is right.  */
 786
 787 #define target_mourn_inferior() \
 788      (*current_target.to_mourn_inferior) ()
 789
 790 /* Does target have enough data to do a run or attach command? */
 791
 792 #define target_can_run(t) \
 793      ((t)->to_can_run) ()
 794
 795 /* post process changes to signal handling in the inferior.  */
 796
 797 #define target_notice_signals(ptid) \
 798      (*current_target.to_notice_signals) (ptid)
 799
 800 /* Check to see if a thread is still alive.  */
 801
 802 #define target_thread_alive(ptid) \
 803      (*current_target.to_thread_alive) (ptid)
 804
 805 /* Query for new threads and add them to the thread list.  */
 806
 807 #define target_find_new_threads() \
 808      (*current_target.to_find_new_threads) (); \
 809
 810 /* Make target stop in a continuable fashion.  (For instance, under
 811    Unix, this should act like SIGSTOP).  This function is normally
 812    used by GUIs to implement a stop button.  */
 813
 814 #define target_stop current_target.to_stop
 815
 816 /* Send the specified COMMAND to the target's monitor
 817    (shell,interpreter) for execution.  The result of the query is
 818    placed in OUTBUF.  */
 819
 820 #define target_rcmd(command, outbuf) \
 821      (*current_target.to_rcmd) (command, outbuf)
 822
 823
 824 /* Get the symbol information for a breakpointable routine called when
 825    an exception event occurs.
 826    Intended mainly for C++, and for those
 827    platforms/implementations where such a callback mechanism is available,
 828    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 829    different mechanisms for debugging exceptions.  */
 830
 831 #define target_enable_exception_callback(kind, enable) \
 832      (*current_target.to_enable_exception_callback) (kind, enable)
 833
 834 /* Get the current exception event kind -- throw or catch, etc.  */
 835
 836 #define target_get_current_exception_event() \
 837      (*current_target.to_get_current_exception_event) ()
 838
 839 /* Does the target include all of memory, or only part of it?  This
 840    determines whether we look up the target chain for other parts of
 841    memory if this target can't satisfy a request.  */
 842
 843 #define target_has_all_memory   \
 844      (current_target.to_has_all_memory)
 845
 846 /* Does the target include memory?  (Dummy targets don't.)  */
 847
 848 #define target_has_memory       \
 849      (current_target.to_has_memory)
 850
 851 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 852    we start a process.)  */
 853
 854 #define target_has_stack        \
 855      (current_target.to_has_stack)
 856
 857 /* Does the target have registers?  (Exec files don't.)  */
 858
 859 #define target_has_registers    \
 860      (current_target.to_has_registers)
 861
 862 /* Does the target have execution?  Can we make it jump (through
 863    hoops), or pop its stack a few times?  FIXME: If this is to work that
 864    way, it needs to check whether an inferior actually exists.
 865    remote-udi.c and probably other targets can be the current target
 866    when the inferior doesn't actually exist at the moment.  Right now
 867    this just tells us whether this target is *capable* of execution.  */
 868
 869 #define target_has_execution    \
 870      (current_target.to_has_execution)
 871
 872 /* Can the target support the debugger control of thread execution?
 873    a) Can it lock the thread scheduler?
 874    b) Can it switch the currently running thread?  */
 875
 876 #define target_can_lock_scheduler \
 877      (current_target.to_has_thread_control & tc_schedlock)
 878
 879 #define target_can_switch_threads \
 880      (current_target.to_has_thread_control & tc_switch)
 881
 882 /* Can the target support asynchronous execution? */
 883 #define target_can_async_p() (current_target.to_can_async_p ())
 884
 885 /* Is the target in asynchronous execution mode? */
 886 #define target_is_async_p() (current_target.to_is_async_p())
 887
 888 /* Put the target in async mode with the specified callback function. */
 889 #define target_async(CALLBACK,CONTEXT) \
 890      (current_target.to_async((CALLBACK), (CONTEXT)))
 891
 892 /* This is to be used ONLY within call_function_by_hand(). It provides
 893    a workaround, to have inferior function calls done in sychronous
 894    mode, even though the target is asynchronous. After
 895    target_async_mask(0) is called, calls to target_can_async_p() will
 896    return FALSE , so that target_resume() will not try to start the
 897    target asynchronously. After the inferior stops, we IMMEDIATELY
 898    restore the previous nature of the target, by calling
 899    target_async_mask(1). After that, target_can_async_p() will return
 900    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 901
 902    FIXME ezannoni 1999-12-13: we won't need this once we move
 903    the turning async on and off to the single execution commands,
 904    from where it is done currently, in remote_resume().  */
 905
 906 #define target_async_mask_value \
 907      (current_target.to_async_mask_value)
 908
 909 extern int target_async_mask (int mask);
 910
 911 extern void target_link (char *, CORE_ADDR *);
 912
 913 /* Converts a process id to a string.  Usually, the string just contains
 914    `process xyz', but on some systems it may contain
 915    `process xyz thread abc'.  */
 916
 917 #undef target_pid_to_str
 918 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
 919
 920 #ifndef target_tid_to_str
 921 #define target_tid_to_str(PID) \
 922      target_pid_to_str (PID)
 923 extern char *normal_pid_to_str (ptid_t ptid);
 924 #endif
 925
 926 /* Return a short string describing extra information about PID,
 927    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
 928    is okay.  */
 929
 930 #define target_extra_thread_info(TP) \
 931      (current_target.to_extra_thread_info (TP))
 932
 933 /*
 934  * New Objfile Event Hook:
 935  *
 936  * Sometimes a GDB component wants to get notified whenever a new
 937  * objfile is loaded.  Mainly this is used by thread-debugging
 938  * implementations that need to know when symbols for the target
 939  * thread implemenation are available.
 940  *
 941  * The old way of doing this is to define a macro 'target_new_objfile'
 942  * that points to the function that you want to be called on every
 943  * objfile/shlib load.
 944  *
 945  * The new way is to grab the function pointer, 'target_new_objfile_hook',
 946  * and point it to the function that you want to be called on every
 947  * objfile/shlib load.
 948  *
 949  * If multiple clients are willing to be cooperative, they can each
 950  * save a pointer to the previous value of target_new_objfile_hook
 951  * before modifying it, and arrange for their function to call the
 952  * previous function in the chain.  In that way, multiple clients
 953  * can receive this notification (something like with signal handlers).
 954  */
 955
 956 extern void (*target_new_objfile_hook) (struct objfile *);
 957
 958 #ifndef target_pid_or_tid_to_str
 959 #define target_pid_or_tid_to_str(ID) \
 960      target_pid_to_str (ID)
 961 #endif
 962
 963 /* Attempts to find the pathname of the executable file
 964    that was run to create a specified process.
 965
 966    The process PID must be stopped when this operation is used.
 967
 968    If the executable file cannot be determined, NULL is returned.
 969
 970    Else, a pointer to a character string containing the pathname
 971    is returned.  This string should be copied into a buffer by
 972    the client if the string will not be immediately used, or if
 973    it must persist.  */
 974
 975 #define target_pid_to_exec_file(pid) \
 976      (current_target.to_pid_to_exec_file) (pid)
 977
 978 /*
 979  * Iterator function for target memory regions.
 980  * Calls a callback function once for each memory region 'mapped'
 981  * in the child process.  Defined as a simple macro rather than
 982  * as a function macro so that it can be tested for nullity.
 983  */
 984
 985 #define target_find_memory_regions(FUNC, DATA) \
 986      (current_target.to_find_memory_regions) (FUNC, DATA)
 987
 988 /*
 989  * Compose corefile .note section.
 990  */
 991
 992 #define target_make_corefile_notes(BFD, SIZE_P) \
 993      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
 994
 995 /* Thread-local values.  */
 996 #define target_get_thread_local_address \
 997     (current_target.to_get_thread_local_address)
 998 #define target_get_thread_local_address_p() \
 999     (target_get_thread_local_address != NULL)
1000
1001 /* Hook to call target dependent code just after inferior target process has
1002    started.  */
1003
1004 #ifndef TARGET_CREATE_INFERIOR_HOOK
1005 #define TARGET_CREATE_INFERIOR_HOOK(PID)
1006 #endif
1007
1008 /* Hardware watchpoint interfaces.  */
1009
1010 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1011    write).  */
1012
1013 #ifndef STOPPED_BY_WATCHPOINT
1014 #define STOPPED_BY_WATCHPOINT(w) \
1015    (*current_target.to_stopped_by_watchpoint) ()
1016 #endif
1017
1018 /* Non-zero if we have continuable watchpoints  */
1019
1020 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1021 #define HAVE_CONTINUABLE_WATCHPOINT \
1022    (current_target.to_have_continuable_watchpoint)
1023 #endif
1024
1025 /* HP-UX supplies these operations, which respectively disable and enable
1026    the memory page-protections that are used to implement hardware watchpoints
1027    on that platform.  See wait_for_inferior's use of these.  */
1028
1029 #if !defined(TARGET_DISABLE_HW_WATCHPOINTS)
1030 #define TARGET_DISABLE_HW_WATCHPOINTS(pid)
1031 #endif
1032
1033 #if !defined(TARGET_ENABLE_HW_WATCHPOINTS)
1034 #define TARGET_ENABLE_HW_WATCHPOINTS(pid)
1035 #endif
1036
1037 /* Provide defaults for hardware watchpoint functions.  */
1038
1039 /* If the *_hw_beakpoint functions have not been defined
1040    elsewhere use the definitions in the target vector.  */
1041
1042 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1043    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1044    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1045    (including this one?).  OTHERTYPE is who knows what...  */
1046
1047 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1048 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1049  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1050 #endif
1051
1052 #if !defined(TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT)
1053 #define TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT(byte_count) \
1054     (*current_target.to_region_size_ok_for_hw_watchpoint) (byte_count)
1055 #endif
1056
1057
1058 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1059    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1060    success, non-zero for failure.  */
1061
1062 #ifndef target_insert_watchpoint
1063 #define target_insert_watchpoint(addr, len, type)       \
1064      (*current_target.to_insert_watchpoint) (addr, len, type)
1065
1066 #define target_remove_watchpoint(addr, len, type)       \
1067      (*current_target.to_remove_watchpoint) (addr, len, type)
1068 #endif
1069
1070 #ifndef target_insert_hw_breakpoint
1071 #define target_insert_hw_breakpoint(addr, save) \
1072      (*current_target.to_insert_hw_breakpoint) (addr, save)
1073
1074 #define target_remove_hw_breakpoint(addr, save) \
1075      (*current_target.to_remove_hw_breakpoint) (addr, save)
1076 #endif
1077
1078 #ifndef target_stopped_data_address
1079 #define target_stopped_data_address() \
1080     (*current_target.to_stopped_data_address) ()
1081 #endif
1082
1083 /* If defined, then we need to decr pc by this much after a hardware break-
1084    point.  Presumably this overrides DECR_PC_AFTER_BREAK...  */
1085
1086 #ifndef DECR_PC_AFTER_HW_BREAK
1087 #define DECR_PC_AFTER_HW_BREAK 0
1088 #endif
1089
1090 /* Sometimes gdb may pick up what appears to be a valid target address
1091    from a minimal symbol, but the value really means, essentially,
1092    "This is an index into a table which is populated when the inferior
1093    is run.  Therefore, do not attempt to use this as a PC."  */
1094
1095 #if !defined(PC_REQUIRES_RUN_BEFORE_USE)
1096 #define PC_REQUIRES_RUN_BEFORE_USE(pc) (0)
1097 #endif
1098
1099 /* This will only be defined by a target that supports catching vfork events,
1100    such as HP-UX.
1101
1102    On some targets (such as HP-UX 10.20 and earlier), resuming a newly vforked
1103    child process after it has exec'd, causes the parent process to resume as
1104    well.  To prevent the parent from running spontaneously, such targets should
1105    define this to a function that prevents that from happening.  */
1106 #if !defined(ENSURE_VFORKING_PARENT_REMAINS_STOPPED)
1107 #define ENSURE_VFORKING_PARENT_REMAINS_STOPPED(PID) (0)
1108 #endif
1109
1110 /* This will only be defined by a target that supports catching vfork events,
1111    such as HP-UX.
1112
1113    On some targets (such as HP-UX 10.20 and earlier), a newly vforked child
1114    process must be resumed when it delivers its exec event, before the parent
1115    vfork event will be delivered to us.  */
1116
1117 #if !defined(RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK)
1118 #define RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK() (0)
1119 #endif
1120
1121 /* Routines for maintenance of the target structures...
1122
1123    add_target:   Add a target to the list of all possible targets.
1124
1125    push_target:  Make this target the top of the stack of currently used
1126    targets, within its particular stratum of the stack.  Result
1127    is 0 if now atop the stack, nonzero if not on top (maybe
1128    should warn user).
1129
1130    unpush_target: Remove this from the stack of currently used targets,
1131    no matter where it is on the list.  Returns 0 if no
1132    change, 1 if removed from stack.
1133
1134    pop_target:   Remove the top thing on the stack of current targets.  */
1135
1136 extern void add_target (struct target_ops *);
1137
1138 extern int push_target (struct target_ops *);
1139
1140 extern int unpush_target (struct target_ops *);
1141
1142 extern void target_preopen (int);
1143
1144 extern void pop_target (void);
1145
1146 /* Struct section_table maps address ranges to file sections.  It is
1147    mostly used with BFD files, but can be used without (e.g. for handling
1148    raw disks, or files not in formats handled by BFD).  */
1149
1150 struct section_table
1151   {
1152     CORE_ADDR addr;             /* Lowest address in section */
1153     CORE_ADDR endaddr;          /* 1+highest address in section */
1154
1155     sec_ptr the_bfd_section;
1156
1157     bfd *bfd;                   /* BFD file pointer */
1158   };
1159
1160 /* Return the "section" containing the specified address.  */
1161 struct section_table *target_section_by_addr (struct target_ops *target,
1162                                               CORE_ADDR addr);
1163
1164
1165 /* From mem-break.c */
1166
1167 extern int memory_remove_breakpoint (CORE_ADDR, char *);
1168
1169 extern int memory_insert_breakpoint (CORE_ADDR, char *);
1170
1171 extern int default_memory_remove_breakpoint (CORE_ADDR, char *);
1172
1173 extern int default_memory_insert_breakpoint (CORE_ADDR, char *);
1174
1175
1176 /* From target.c */
1177
1178 extern void initialize_targets (void);
1179
1180 extern void noprocess (void);
1181
1182 extern void find_default_attach (char *, int);
1183
1184 extern void find_default_create_inferior (char *, char *, char **);
1185
1186 extern struct target_ops *find_run_target (void);
1187
1188 extern struct target_ops *find_core_target (void);
1189
1190 extern struct target_ops *find_target_beneath (struct target_ops *);
1191
1192 extern int target_resize_to_sections (struct target_ops *target,
1193                                       int num_added);
1194
1195 extern void remove_target_sections (bfd *abfd);
1196
1197 \f
1198 /* Stuff that should be shared among the various remote targets.  */
1199
1200 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1201    information (higher values, more information).  */
1202 extern int remote_debug;
1203
1204 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1205 extern int baud_rate;
1206 /* Timeout limit for response from target. */
1207 extern int remote_timeout;
1208
1209 \f
1210 /* Functions for helping to write a native target.  */
1211
1212 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1213 extern void store_waitstatus (struct target_waitstatus *, int);
1214
1215 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1216    targ_signal SIGNO has an equivalent ``host'' representation.  */
1217 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1218    to the shorter target_signal_p() because it is far less ambigious.
1219    In this context ``target_signal'' refers to GDB's internal
1220    representation of the target's set of signals while ``host signal''
1221    refers to the target operating system's signal.  Confused?  */
1222
1223 extern int target_signal_to_host_p (enum target_signal signo);
1224
1225 /* Convert between host signal numbers and enum target_signal's.
1226    target_signal_to_host() returns 0 and prints a warning() on GDB's
1227    console if SIGNO has no equivalent host representation.  */
1228 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1229    refering to the target operating system's signal numbering.
1230    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1231    gdb_signal'' would probably be better as it is refering to GDB's
1232    internal representation of a target operating system's signal.  */
1233
1234 extern enum target_signal target_signal_from_host (int);
1235 extern int target_signal_to_host (enum target_signal);
1236
1237 /* Convert from a number used in a GDB command to an enum target_signal.  */
1238 extern enum target_signal target_signal_from_command (int);
1239
1240 /* Any target can call this to switch to remote protocol (in remote.c). */
1241 extern void push_remote_target (char *name, int from_tty);
1242 \f
1243 /* Imported from machine dependent code */
1244
1245 /* Blank target vector entries are initialized to target_ignore. */
1246 void target_ignore (void);
1247
1248 #endif /* !defined (TARGET_H) */