gdb/target.h

   1 /* Interface between GDB and target environments, including files and processes
   2    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   3    2000, 2001, 2002 Free Software Foundation, Inc.
   4    Contributed by Cygnus Support.  Written by John Gilmore.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #if !defined (TARGET_H)
  24 #define TARGET_H
  25
  26 /* This include file defines the interface between the main part
  27    of the debugger, and the part which is target-specific, or
  28    specific to the communications interface between us and the
  29    target.
  30
  31    A TARGET is an interface between the debugger and a particular
  32    kind of file or process.  Targets can be STACKED in STRATA,
  33    so that more than one target can potentially respond to a request.
  34    In particular, memory accesses will walk down the stack of targets
  35    until they find a target that is interested in handling that particular
  36    address.  STRATA are artificial boundaries on the stack, within
  37    which particular kinds of targets live.  Strata exist so that
  38    people don't get confused by pushing e.g. a process target and then
  39    a file target, and wondering why they can't see the current values
  40    of variables any more (the file target is handling them and they
  41    never get to the process target).  So when you push a file target,
  42    it goes into the file stratum, which is always below the process
  43    stratum.  */
  44
  45 #include "bfd.h"
  46 #include "symtab.h"
  47 #include "dcache.h"
  48 #include "memattr.h"
  49
  50 enum strata
  51   {
  52     dummy_stratum,              /* The lowest of the low */
  53     file_stratum,               /* Executable files, etc */
  54     core_stratum,               /* Core dump files */
  55     download_stratum,           /* Downloading of remote targets */
  56     process_stratum,            /* Executing processes */
  57     thread_stratum              /* Executing threads */
  58   };
  59
  60 enum thread_control_capabilities
  61   {
  62     tc_none = 0,                /* Default: can't control thread execution.  */
  63     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  64     tc_switch = 2               /* Can switch the running thread on demand.  */
  65   };
  66
  67 /* Stuff for target_wait.  */
  68
  69 /* Generally, what has the program done?  */
  70 enum target_waitkind
  71   {
  72     /* The program has exited.  The exit status is in value.integer.  */
  73     TARGET_WAITKIND_EXITED,
  74
  75     /* The program has stopped with a signal.  Which signal is in
  76        value.sig.  */
  77     TARGET_WAITKIND_STOPPED,
  78
  79     /* The program has terminated with a signal.  Which signal is in
  80        value.sig.  */
  81     TARGET_WAITKIND_SIGNALLED,
  82
  83     /* The program is letting us know that it dynamically loaded something
  84        (e.g. it called load(2) on AIX).  */
  85     TARGET_WAITKIND_LOADED,
  86
  87     /* The program has forked.  A "related" process' ID is in
  88        value.related_pid.  I.e., if the child forks, value.related_pid
  89        is the parent's ID.  */
  90
  91     TARGET_WAITKIND_FORKED,
  92
  93     /* The program has vforked.  A "related" process's ID is in
  94        value.related_pid.  */
  95
  96     TARGET_WAITKIND_VFORKED,
  97
  98     /* The program has exec'ed a new executable file.  The new file's
  99        pathname is pointed to by value.execd_pathname.  */
 100
 101     TARGET_WAITKIND_EXECD,
 102
 103     /* The program has entered or returned from a system call.  On
 104        HP-UX, this is used in the hardware watchpoint implementation.
 105        The syscall's unique integer ID number is in value.syscall_id */
 106
 107     TARGET_WAITKIND_SYSCALL_ENTRY,
 108     TARGET_WAITKIND_SYSCALL_RETURN,
 109
 110     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 111        within target_wait, but I'm not sure target_wait should be resuming the
 112        inferior.  */
 113     TARGET_WAITKIND_SPURIOUS,
 114
 115     /* This is used for target async and extended-async
 116        only. Remote_async_wait() returns this when there is an event
 117        on the inferior, but the rest of the world is not interested in
 118        it. The inferior has not stopped, but has just sent some output
 119        to the console, for instance. In this case, we want to go back
 120        to the event loop and wait there for another event from the
 121        inferior, rather than being stuck in the remote_async_wait()
 122        function. This way the event loop is responsive to other events,
 123        like for instance the user typing.  */
 124     TARGET_WAITKIND_IGNORE
 125   };
 126
 127 struct target_waitstatus
 128   {
 129     enum target_waitkind kind;
 130
 131     /* Forked child pid, execd pathname, exit status or signal number.  */
 132     union
 133       {
 134         int integer;
 135         enum target_signal sig;
 136         int related_pid;
 137         char *execd_pathname;
 138         int syscall_id;
 139       }
 140     value;
 141   };
 142
 143 /* Possible types of events that the inferior handler will have to
 144    deal with.  */
 145 enum inferior_event_type
 146   {
 147     /* There is a request to quit the inferior, abandon it.  */
 148     INF_QUIT_REQ,
 149     /* Process a normal inferior event which will result in target_wait
 150        being called.  */
 151     INF_REG_EVENT,
 152     /* Deal with an error on the inferior.  */
 153     INF_ERROR,
 154     /* We are called because a timer went off.  */
 155     INF_TIMER,
 156     /* We are called to do stuff after the inferior stops.  */
 157     INF_EXEC_COMPLETE,
 158     /* We are called to do some stuff after the inferior stops, but we
 159        are expected to reenter the proceed() and
 160        handle_inferior_event() functions. This is used only in case of
 161        'step n' like commands.  */
 162     INF_EXEC_CONTINUE
 163   };
 164
 165 /* Return the string for a signal.  */
 166 extern char *target_signal_to_string (enum target_signal);
 167
 168 /* Return the name (SIGHUP, etc.) for a signal.  */
 169 extern char *target_signal_to_name (enum target_signal);
 170
 171 /* Given a name (SIGHUP, etc.), return its signal.  */
 172 enum target_signal target_signal_from_name (char *);
 173 \f
 174
 175 /* If certain kinds of activity happen, target_wait should perform
 176    callbacks.  */
 177 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 178    on TARGET_ACTIVITY_FD.  */
 179 extern int target_activity_fd;
 180 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 181 extern int (*target_activity_function) (void);
 182 \f
 183 struct thread_info;             /* fwd decl for parameter list below: */
 184
 185 struct target_ops
 186   {
 187     char *to_shortname;         /* Name this target type */
 188     char *to_longname;          /* Name for printing */
 189     char *to_doc;               /* Documentation.  Does not include trailing
 190                                    newline, and starts with a one-line descrip-
 191                                    tion (probably similar to to_longname).  */
 192     void (*to_open) (char *, int);
 193     void (*to_close) (int);
 194     void (*to_attach) (char *, int);
 195     void (*to_post_attach) (int);
 196     void (*to_require_attach) (char *, int);
 197     void (*to_detach) (char *, int);
 198     void (*to_require_detach) (int, char *, int);
 199     void (*to_resume) (ptid_t, int, enum target_signal);
 200     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 201     void (*to_post_wait) (ptid_t, int);
 202     void (*to_fetch_registers) (int);
 203     void (*to_store_registers) (int);
 204     void (*to_prepare_to_store) (void);
 205
 206     /* Transfer LEN bytes of memory between GDB address MYADDR and
 207        target address MEMADDR.  If WRITE, transfer them to the target, else
 208        transfer them from the target.  TARGET is the target from which we
 209        get this function.
 210
 211        Return value, N, is one of the following:
 212
 213        0 means that we can't handle this.  If errno has been set, it is the
 214        error which prevented us from doing it (FIXME: What about bfd_error?).
 215
 216        positive (call it N) means that we have transferred N bytes
 217        starting at MEMADDR.  We might be able to handle more bytes
 218        beyond this length, but no promises.
 219
 220        negative (call its absolute value N) means that we cannot
 221        transfer right at MEMADDR, but we could transfer at least
 222        something at MEMADDR + N.  */
 223
 224     int (*to_xfer_memory) (CORE_ADDR memaddr, char *myaddr,
 225                            int len, int write,
 226                            struct mem_attrib *attrib,
 227                            struct target_ops *target);
 228
 229 #if 0
 230     /* Enable this after 4.12.  */
 231
 232     /* Search target memory.  Start at STARTADDR and take LEN bytes of
 233        target memory, and them with MASK, and compare to DATA.  If they
 234        match, set *ADDR_FOUND to the address we found it at, store the data
 235        we found at LEN bytes starting at DATA_FOUND, and return.  If
 236        not, add INCREMENT to the search address and keep trying until
 237        the search address is outside of the range [LORANGE,HIRANGE).
 238
 239        If we don't find anything, set *ADDR_FOUND to (CORE_ADDR)0 and
 240        return.  */
 241
 242     void (*to_search) (int len, char *data, char *mask,
 243                        CORE_ADDR startaddr, int increment,
 244                        CORE_ADDR lorange, CORE_ADDR hirange,
 245                        CORE_ADDR * addr_found, char *data_found);
 246
 247 #define target_search(len, data, mask, startaddr, increment, lorange, hirange, addr_found, data_found)  \
 248     (*current_target.to_search) (len, data, mask, startaddr, increment, \
 249                                  lorange, hirange, addr_found, data_found)
 250 #endif                          /* 0 */
 251
 252     void (*to_files_info) (struct target_ops *);
 253     int (*to_insert_breakpoint) (CORE_ADDR, char *);
 254     int (*to_remove_breakpoint) (CORE_ADDR, char *);
 255     void (*to_terminal_init) (void);
 256     void (*to_terminal_inferior) (void);
 257     void (*to_terminal_ours_for_output) (void);
 258     void (*to_terminal_ours) (void);
 259     void (*to_terminal_info) (char *, int);
 260     void (*to_kill) (void);
 261     void (*to_load) (char *, int);
 262     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 263     void (*to_create_inferior) (char *, char *, char **);
 264     void (*to_post_startup_inferior) (ptid_t);
 265     void (*to_acknowledge_created_inferior) (int);
 266     void (*to_clone_and_follow_inferior) (int, int *);
 267     void (*to_post_follow_inferior_by_clone) (void);
 268     int (*to_insert_fork_catchpoint) (int);
 269     int (*to_remove_fork_catchpoint) (int);
 270     int (*to_insert_vfork_catchpoint) (int);
 271     int (*to_remove_vfork_catchpoint) (int);
 272     int (*to_has_forked) (int, int *);
 273     int (*to_has_vforked) (int, int *);
 274     int (*to_can_follow_vfork_prior_to_exec) (void);
 275     void (*to_post_follow_vfork) (int, int, int, int);
 276     int (*to_insert_exec_catchpoint) (int);
 277     int (*to_remove_exec_catchpoint) (int);
 278     int (*to_has_execd) (int, char **);
 279     int (*to_reported_exec_events_per_exec_call) (void);
 280     int (*to_has_syscall_event) (int, enum target_waitkind *, int *);
 281     int (*to_has_exited) (int, int, int *);
 282     void (*to_mourn_inferior) (void);
 283     int (*to_can_run) (void);
 284     void (*to_notice_signals) (ptid_t ptid);
 285     int (*to_thread_alive) (ptid_t ptid);
 286     void (*to_find_new_threads) (void);
 287     char *(*to_pid_to_str) (ptid_t);
 288     char *(*to_extra_thread_info) (struct thread_info *);
 289     void (*to_stop) (void);
 290     int (*to_query) (int /*char */ , char *, char *, int *);
 291     void (*to_rcmd) (char *command, struct ui_file *output);
 292     struct symtab_and_line *(*to_enable_exception_callback) (enum
 293                                                              exception_event_kind,
 294                                                              int);
 295     struct exception_event_record *(*to_get_current_exception_event) (void);
 296     char *(*to_pid_to_exec_file) (int pid);
 297     enum strata to_stratum;
 298     struct target_ops
 299      *DONT_USE;                 /* formerly to_next */
 300     int to_has_all_memory;
 301     int to_has_memory;
 302     int to_has_stack;
 303     int to_has_registers;
 304     int to_has_execution;
 305     int to_has_thread_control;  /* control thread execution */
 306     struct section_table
 307      *to_sections;
 308     struct section_table
 309      *to_sections_end;
 310     /* ASYNC target controls */
 311     int (*to_can_async_p) (void);
 312     int (*to_is_async_p) (void);
 313     void (*to_async) (void (*cb) (enum inferior_event_type, void *context),
 314                       void *context);
 315     int to_async_mask_value;
 316     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 317                                             unsigned long,
 318                                             int, int, int,
 319                                             void *),
 320                                    void *);
 321     char * (*to_make_corefile_notes) (bfd *, int *);
 322     int to_magic;
 323     /* Need sub-structure for target machine related rather than comm related?
 324      */
 325   };
 326
 327 /* Magic number for checking ops size.  If a struct doesn't end with this
 328    number, somebody changed the declaration but didn't change all the
 329    places that initialize one.  */
 330
 331 #define OPS_MAGIC       3840
 332
 333 /* The ops structure for our "current" target process.  This should
 334    never be NULL.  If there is no target, it points to the dummy_target.  */
 335
 336 extern struct target_ops current_target;
 337
 338 /* An item on the target stack.  */
 339
 340 struct target_stack_item
 341   {
 342     struct target_stack_item *next;
 343     struct target_ops *target_ops;
 344   };
 345
 346 /* The target stack.  */
 347
 348 extern struct target_stack_item *target_stack;
 349
 350 /* Define easy words for doing these operations on our current target.  */
 351
 352 #define target_shortname        (current_target.to_shortname)
 353 #define target_longname         (current_target.to_longname)
 354
 355 /* The open routine takes the rest of the parameters from the command,
 356    and (if successful) pushes a new target onto the stack.
 357    Targets should supply this routine, if only to provide an error message.  */
 358
 359 #define target_open(name, from_tty)                                     \
 360   do {                                                                  \
 361     dcache_invalidate (target_dcache);                                  \
 362     (*current_target.to_open) (name, from_tty);                         \
 363   } while (0)
 364
 365 /* Does whatever cleanup is required for a target that we are no longer
 366    going to be calling.  Argument says whether we are quitting gdb and
 367    should not get hung in case of errors, or whether we want a clean
 368    termination even if it takes a while.  This routine is automatically
 369    always called just before a routine is popped off the target stack.
 370    Closing file descriptors and freeing memory are typical things it should
 371    do.  */
 372
 373 #define target_close(quitting)  \
 374      (*current_target.to_close) (quitting)
 375
 376 /* Attaches to a process on the target side.  Arguments are as passed
 377    to the `attach' command by the user.  This routine can be called
 378    when the target is not on the target-stack, if the target_can_run
 379    routine returns 1; in that case, it must push itself onto the stack.
 380    Upon exit, the target should be ready for normal operations, and
 381    should be ready to deliver the status of the process immediately
 382    (without waiting) to an upcoming target_wait call.  */
 383
 384 #define target_attach(args, from_tty)   \
 385      (*current_target.to_attach) (args, from_tty)
 386
 387 /* The target_attach operation places a process under debugger control,
 388    and stops the process.
 389
 390    This operation provides a target-specific hook that allows the
 391    necessary bookkeeping to be performed after an attach completes.  */
 392 #define target_post_attach(pid) \
 393      (*current_target.to_post_attach) (pid)
 394
 395 /* Attaches to a process on the target side, if not already attached.
 396    (If already attached, takes no action.)
 397
 398    This operation can be used to follow the child process of a fork.
 399    On some targets, such child processes of an original inferior process
 400    are automatically under debugger control, and thus do not require an
 401    actual attach operation.  */
 402
 403 #define target_require_attach(args, from_tty)   \
 404      (*current_target.to_require_attach) (args, from_tty)
 405
 406 /* Takes a program previously attached to and detaches it.
 407    The program may resume execution (some targets do, some don't) and will
 408    no longer stop on signals, etc.  We better not have left any breakpoints
 409    in the program or it'll die when it hits one.  ARGS is arguments
 410    typed by the user (e.g. a signal to send the process).  FROM_TTY
 411    says whether to be verbose or not.  */
 412
 413 extern void target_detach (char *, int);
 414
 415 /* Detaches from a process on the target side, if not already dettached.
 416    (If already detached, takes no action.)
 417
 418    This operation can be used to follow the parent process of a fork.
 419    On some targets, such child processes of an original inferior process
 420    are automatically under debugger control, and thus do require an actual
 421    detach operation.
 422
 423    PID is the process id of the child to detach from.
 424    ARGS is arguments typed by the user (e.g. a signal to send the process).
 425    FROM_TTY says whether to be verbose or not.  */
 426
 427 #define target_require_detach(pid, args, from_tty)      \
 428      (*current_target.to_require_detach) (pid, args, from_tty)
 429
 430 /* Resume execution of the target process PTID.  STEP says whether to
 431    single-step or to run free; SIGGNAL is the signal to be given to
 432    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 433    pass TARGET_SIGNAL_DEFAULT.  */
 434
 435 #define target_resume(ptid, step, siggnal)                              \
 436   do {                                                                  \
 437     dcache_invalidate(target_dcache);                                   \
 438     (*current_target.to_resume) (ptid, step, siggnal);                  \
 439   } while (0)
 440
 441 /* Wait for process pid to do something.  PTID = -1 to wait for any
 442    pid to do something.  Return pid of child, or -1 in case of error;
 443    store status through argument pointer STATUS.  Note that it is
 444    _NOT_ OK to throw_exception() out of target_wait() without popping
 445    the debugging target from the stack; GDB isn't prepared to get back
 446    to the prompt with a debugging target but without the frame cache,
 447    stop_pc, etc., set up.  */
 448
 449 #define target_wait(ptid, status)               \
 450      (*current_target.to_wait) (ptid, status)
 451
 452 /* The target_wait operation waits for a process event to occur, and
 453    thereby stop the process.
 454
 455    On some targets, certain events may happen in sequences.  gdb's
 456    correct response to any single event of such a sequence may require
 457    knowledge of what earlier events in the sequence have been seen.
 458
 459    This operation provides a target-specific hook that allows the
 460    necessary bookkeeping to be performed to track such sequences.  */
 461
 462 #define target_post_wait(ptid, status) \
 463      (*current_target.to_post_wait) (ptid, status)
 464
 465 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 466
 467 #define target_fetch_registers(regno)   \
 468      (*current_target.to_fetch_registers) (regno)
 469
 470 /* Store at least register REGNO, or all regs if REGNO == -1.
 471    It can store as many registers as it wants to, so target_prepare_to_store
 472    must have been previously called.  Calls error() if there are problems.  */
 473
 474 #define target_store_registers(regs)    \
 475      (*current_target.to_store_registers) (regs)
 476
 477 /* Get ready to modify the registers array.  On machines which store
 478    individual registers, this doesn't need to do anything.  On machines
 479    which store all the registers in one fell swoop, this makes sure
 480    that REGISTERS contains all the registers from the program being
 481    debugged.  */
 482
 483 #define target_prepare_to_store()       \
 484      (*current_target.to_prepare_to_store) ()
 485
 486 extern DCACHE *target_dcache;
 487
 488 extern int do_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
 489                            struct mem_attrib *attrib);
 490
 491 extern int target_read_string (CORE_ADDR, char **, int, int *);
 492
 493 extern int target_read_memory (CORE_ADDR memaddr, char *myaddr, int len);
 494
 495 extern int target_write_memory (CORE_ADDR memaddr, char *myaddr, int len);
 496
 497 extern int xfer_memory (CORE_ADDR, char *, int, int,
 498                         struct mem_attrib *, struct target_ops *);
 499
 500 extern int child_xfer_memory (CORE_ADDR, char *, int, int,
 501                               struct mem_attrib *, struct target_ops *);
 502
 503 /* Make a single attempt at transfering LEN bytes.  On a successful
 504    transfer, the number of bytes actually transfered is returned and
 505    ERR is set to 0.  When a transfer fails, -1 is returned (the number
 506    of bytes actually transfered is not defined) and ERR is set to a
 507    non-zero error indication.  */
 508
 509 extern int
 510 target_read_memory_partial (CORE_ADDR addr, char *buf, int len, int *err);
 511
 512 extern int
 513 target_write_memory_partial (CORE_ADDR addr, char *buf, int len, int *err);
 514
 515 extern char *child_pid_to_exec_file (int);
 516
 517 extern char *child_core_file_to_sym_file (char *);
 518
 519 #if defined(CHILD_POST_ATTACH)
 520 extern void child_post_attach (int);
 521 #endif
 522
 523 extern void child_post_wait (ptid_t, int);
 524
 525 extern void child_post_startup_inferior (ptid_t);
 526
 527 extern void child_acknowledge_created_inferior (int);
 528
 529 extern void child_clone_and_follow_inferior (int, int *);
 530
 531 extern void child_post_follow_inferior_by_clone (void);
 532
 533 extern int child_insert_fork_catchpoint (int);
 534
 535 extern int child_remove_fork_catchpoint (int);
 536
 537 extern int child_insert_vfork_catchpoint (int);
 538
 539 extern int child_remove_vfork_catchpoint (int);
 540
 541 extern int child_has_forked (int, int *);
 542
 543 extern int child_has_vforked (int, int *);
 544
 545 extern void child_acknowledge_created_inferior (int);
 546
 547 extern int child_can_follow_vfork_prior_to_exec (void);
 548
 549 extern void child_post_follow_vfork (int, int, int, int);
 550
 551 extern int child_insert_exec_catchpoint (int);
 552
 553 extern int child_remove_exec_catchpoint (int);
 554
 555 extern int child_has_execd (int, char **);
 556
 557 extern int child_reported_exec_events_per_exec_call (void);
 558
 559 extern int child_has_syscall_event (int, enum target_waitkind *, int *);
 560
 561 extern int child_has_exited (int, int, int *);
 562
 563 extern int child_thread_alive (ptid_t);
 564
 565 /* From exec.c */
 566
 567 extern void print_section_info (struct target_ops *, bfd *);
 568
 569 /* Print a line about the current target.  */
 570
 571 #define target_files_info()     \
 572      (*current_target.to_files_info) (&current_target)
 573
 574 /* Insert a breakpoint at address ADDR in the target machine.
 575    SAVE is a pointer to memory allocated for saving the
 576    target contents.  It is guaranteed by the caller to be long enough
 577    to save "sizeof BREAKPOINT" bytes.  Result is 0 for success, or
 578    an errno value.  */
 579
 580 #define target_insert_breakpoint(addr, save)    \
 581      (*current_target.to_insert_breakpoint) (addr, save)
 582
 583 /* Remove a breakpoint at address ADDR in the target machine.
 584    SAVE is a pointer to the same save area
 585    that was previously passed to target_insert_breakpoint.
 586    Result is 0 for success, or an errno value.  */
 587
 588 #define target_remove_breakpoint(addr, save)    \
 589      (*current_target.to_remove_breakpoint) (addr, save)
 590
 591 /* Initialize the terminal settings we record for the inferior,
 592    before we actually run the inferior.  */
 593
 594 #define target_terminal_init() \
 595      (*current_target.to_terminal_init) ()
 596
 597 /* Put the inferior's terminal settings into effect.
 598    This is preparation for starting or resuming the inferior.  */
 599
 600 #define target_terminal_inferior() \
 601      (*current_target.to_terminal_inferior) ()
 602
 603 /* Put some of our terminal settings into effect,
 604    enough to get proper results from our output,
 605    but do not change into or out of RAW mode
 606    so that no input is discarded.
 607
 608    After doing this, either terminal_ours or terminal_inferior
 609    should be called to get back to a normal state of affairs.  */
 610
 611 #define target_terminal_ours_for_output() \
 612      (*current_target.to_terminal_ours_for_output) ()
 613
 614 /* Put our terminal settings into effect.
 615    First record the inferior's terminal settings
 616    so they can be restored properly later.  */
 617
 618 #define target_terminal_ours() \
 619      (*current_target.to_terminal_ours) ()
 620
 621 /* Print useful information about our terminal status, if such a thing
 622    exists.  */
 623
 624 #define target_terminal_info(arg, from_tty) \
 625      (*current_target.to_terminal_info) (arg, from_tty)
 626
 627 /* Kill the inferior process.   Make it go away.  */
 628
 629 #define target_kill() \
 630      (*current_target.to_kill) ()
 631
 632 /* Load an executable file into the target process.  This is expected
 633    to not only bring new code into the target process, but also to
 634    update GDB's symbol tables to match.  */
 635
 636 extern void target_load (char *arg, int from_tty);
 637
 638 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 639    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 640    symbol should be returned.  The result is 0 if successful, nonzero
 641    if the symbol does not exist in the target environment.  This
 642    function should not call error() if communication with the target
 643    is interrupted, since it is called from symbol reading, but should
 644    return nonzero, possibly doing a complain().  */
 645
 646 #define target_lookup_symbol(name, addrp) \
 647      (*current_target.to_lookup_symbol) (name, addrp)
 648
 649 /* Start an inferior process and set inferior_ptid to its pid.
 650    EXEC_FILE is the file to run.
 651    ALLARGS is a string containing the arguments to the program.
 652    ENV is the environment vector to pass.  Errors reported with error().
 653    On VxWorks and various standalone systems, we ignore exec_file.  */
 654
 655 #define target_create_inferior(exec_file, args, env)    \
 656      (*current_target.to_create_inferior) (exec_file, args, env)
 657
 658
 659 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 660    notification of inferior events such as fork and vork immediately
 661    after the inferior is created.  (This because of how gdb gets an
 662    inferior created via invoking a shell to do it.  In such a scenario,
 663    if the shell init file has commands in it, the shell will fork and
 664    exec for each of those commands, and we will see each such fork
 665    event.  Very bad.)
 666
 667    Such targets will supply an appropriate definition for this function.  */
 668
 669 #define target_post_startup_inferior(ptid) \
 670      (*current_target.to_post_startup_inferior) (ptid)
 671
 672 /* On some targets, the sequence of starting up an inferior requires
 673    some synchronization between gdb and the new inferior process, PID.  */
 674
 675 #define target_acknowledge_created_inferior(pid) \
 676      (*current_target.to_acknowledge_created_inferior) (pid)
 677
 678 /* An inferior process has been created via a fork() or similar
 679    system call.  This function will clone the debugger, then ensure
 680    that CHILD_PID is attached to by that debugger.
 681
 682    FOLLOWED_CHILD is set TRUE on return *for the clone debugger only*,
 683    and FALSE otherwise.  (The original and clone debuggers can use this
 684    to determine which they are, if need be.)
 685
 686    (This is not a terribly useful feature without a GUI to prevent
 687    the two debuggers from competing for shell input.)  */
 688
 689 #define target_clone_and_follow_inferior(child_pid,followed_child) \
 690      (*current_target.to_clone_and_follow_inferior) (child_pid, followed_child)
 691
 692 /* This operation is intended to be used as the last in a sequence of
 693    steps taken when following both parent and child of a fork.  This
 694    is used by a clone of the debugger, which will follow the child.
 695
 696    The original debugger has detached from this process, and the
 697    clone has attached to it.
 698
 699    On some targets, this requires a bit of cleanup to make it work
 700    correctly.  */
 701
 702 #define target_post_follow_inferior_by_clone() \
 703      (*current_target.to_post_follow_inferior_by_clone) ()
 704
 705 /* On some targets, we can catch an inferior fork or vfork event when
 706    it occurs.  These functions insert/remove an already-created
 707    catchpoint for such events.  */
 708
 709 #define target_insert_fork_catchpoint(pid) \
 710      (*current_target.to_insert_fork_catchpoint) (pid)
 711
 712 #define target_remove_fork_catchpoint(pid) \
 713      (*current_target.to_remove_fork_catchpoint) (pid)
 714
 715 #define target_insert_vfork_catchpoint(pid) \
 716      (*current_target.to_insert_vfork_catchpoint) (pid)
 717
 718 #define target_remove_vfork_catchpoint(pid) \
 719      (*current_target.to_remove_vfork_catchpoint) (pid)
 720
 721 /* Returns TRUE if PID has invoked the fork() system call.  And,
 722    also sets CHILD_PID to the process id of the other ("child")
 723    inferior process that was created by that call.  */
 724
 725 #define target_has_forked(pid,child_pid) \
 726      (*current_target.to_has_forked) (pid,child_pid)
 727
 728 /* Returns TRUE if PID has invoked the vfork() system call.  And,
 729    also sets CHILD_PID to the process id of the other ("child")
 730    inferior process that was created by that call.  */
 731
 732 #define target_has_vforked(pid,child_pid) \
 733      (*current_target.to_has_vforked) (pid,child_pid)
 734
 735 /* Some platforms (such as pre-10.20 HP-UX) don't allow us to do
 736    anything to a vforked child before it subsequently calls exec().
 737    On such platforms, we say that the debugger cannot "follow" the
 738    child until it has vforked.
 739
 740    This function should be defined to return 1 by those targets
 741    which can allow the debugger to immediately follow a vforked
 742    child, and 0 if they cannot.  */
 743
 744 #define target_can_follow_vfork_prior_to_exec() \
 745      (*current_target.to_can_follow_vfork_prior_to_exec) ()
 746
 747 /* An inferior process has been created via a vfork() system call.
 748    The debugger has followed the parent, the child, or both.  The
 749    process of setting up for that follow may have required some
 750    target-specific trickery to track the sequence of reported events.
 751    If so, this function should be defined by those targets that
 752    require the debugger to perform cleanup or initialization after
 753    the vfork follow.  */
 754
 755 #define target_post_follow_vfork(parent_pid,followed_parent,child_pid,followed_child) \
 756      (*current_target.to_post_follow_vfork) (parent_pid,followed_parent,child_pid,followed_child)
 757
 758 /* On some targets, we can catch an inferior exec event when it
 759    occurs.  These functions insert/remove an already-created
 760    catchpoint for such events.  */
 761
 762 #define target_insert_exec_catchpoint(pid) \
 763      (*current_target.to_insert_exec_catchpoint) (pid)
 764
 765 #define target_remove_exec_catchpoint(pid) \
 766      (*current_target.to_remove_exec_catchpoint) (pid)
 767
 768 /* Returns TRUE if PID has invoked a flavor of the exec() system call.
 769    And, also sets EXECD_PATHNAME to the pathname of the executable
 770    file that was passed to exec(), and is now being executed.  */
 771
 772 #define target_has_execd(pid,execd_pathname) \
 773      (*current_target.to_has_execd) (pid,execd_pathname)
 774
 775 /* Returns the number of exec events that are reported when a process
 776    invokes a flavor of the exec() system call on this target, if exec
 777    events are being reported.  */
 778
 779 #define target_reported_exec_events_per_exec_call() \
 780      (*current_target.to_reported_exec_events_per_exec_call) ()
 781
 782 /* Returns TRUE if PID has reported a syscall event.  And, also sets
 783    KIND to the appropriate TARGET_WAITKIND_, and sets SYSCALL_ID to
 784    the unique integer ID of the syscall.  */
 785
 786 #define target_has_syscall_event(pid,kind,syscall_id) \
 787      (*current_target.to_has_syscall_event) (pid,kind,syscall_id)
 788
 789 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 790    exit code of PID, if any.  */
 791
 792 #define target_has_exited(pid,wait_status,exit_status) \
 793      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 794
 795 /* The debugger has completed a blocking wait() call.  There is now
 796    some process event that must be processed.  This function should
 797    be defined by those targets that require the debugger to perform
 798    cleanup or internal state changes in response to the process event.  */
 799
 800 /* The inferior process has died.  Do what is right.  */
 801
 802 #define target_mourn_inferior() \
 803      (*current_target.to_mourn_inferior) ()
 804
 805 /* Does target have enough data to do a run or attach command? */
 806
 807 #define target_can_run(t) \
 808      ((t)->to_can_run) ()
 809
 810 /* post process changes to signal handling in the inferior.  */
 811
 812 #define target_notice_signals(ptid) \
 813      (*current_target.to_notice_signals) (ptid)
 814
 815 /* Check to see if a thread is still alive.  */
 816
 817 #define target_thread_alive(ptid) \
 818      (*current_target.to_thread_alive) (ptid)
 819
 820 /* Query for new threads and add them to the thread list.  */
 821
 822 #define target_find_new_threads() \
 823      (*current_target.to_find_new_threads) (); \
 824
 825 /* Make target stop in a continuable fashion.  (For instance, under
 826    Unix, this should act like SIGSTOP).  This function is normally
 827    used by GUIs to implement a stop button.  */
 828
 829 #define target_stop current_target.to_stop
 830
 831 /* Queries the target side for some information.  The first argument is a
 832    letter specifying the type of the query, which is used to determine who
 833    should process it.  The second argument is a string that specifies which
 834    information is desired and the third is a buffer that carries back the
 835    response from the target side. The fourth parameter is the size of the
 836    output buffer supplied.  */
 837
 838 #define target_query(query_type, query, resp_buffer, bufffer_size)      \
 839      (*current_target.to_query) (query_type, query, resp_buffer, bufffer_size)
 840
 841 /* Send the specified COMMAND to the target's monitor
 842    (shell,interpreter) for execution.  The result of the query is
 843    placed in OUTBUF.  */
 844
 845 #define target_rcmd(command, outbuf) \
 846      (*current_target.to_rcmd) (command, outbuf)
 847
 848
 849 /* Get the symbol information for a breakpointable routine called when
 850    an exception event occurs.
 851    Intended mainly for C++, and for those
 852    platforms/implementations where such a callback mechanism is available,
 853    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 854    different mechanisms for debugging exceptions.  */
 855
 856 #define target_enable_exception_callback(kind, enable) \
 857      (*current_target.to_enable_exception_callback) (kind, enable)
 858
 859 /* Get the current exception event kind -- throw or catch, etc.  */
 860
 861 #define target_get_current_exception_event() \
 862      (*current_target.to_get_current_exception_event) ()
 863
 864 /* Pointer to next target in the chain, e.g. a core file and an exec file.  */
 865
 866 #define target_next \
 867      (current_target.to_next)
 868
 869 /* Does the target include all of memory, or only part of it?  This
 870    determines whether we look up the target chain for other parts of
 871    memory if this target can't satisfy a request.  */
 872
 873 #define target_has_all_memory   \
 874      (current_target.to_has_all_memory)
 875
 876 /* Does the target include memory?  (Dummy targets don't.)  */
 877
 878 #define target_has_memory       \
 879      (current_target.to_has_memory)
 880
 881 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 882    we start a process.)  */
 883
 884 #define target_has_stack        \
 885      (current_target.to_has_stack)
 886
 887 /* Does the target have registers?  (Exec files don't.)  */
 888
 889 #define target_has_registers    \
 890      (current_target.to_has_registers)
 891
 892 /* Does the target have execution?  Can we make it jump (through
 893    hoops), or pop its stack a few times?  FIXME: If this is to work that
 894    way, it needs to check whether an inferior actually exists.
 895    remote-udi.c and probably other targets can be the current target
 896    when the inferior doesn't actually exist at the moment.  Right now
 897    this just tells us whether this target is *capable* of execution.  */
 898
 899 #define target_has_execution    \
 900      (current_target.to_has_execution)
 901
 902 /* Can the target support the debugger control of thread execution?
 903    a) Can it lock the thread scheduler?
 904    b) Can it switch the currently running thread?  */
 905
 906 #define target_can_lock_scheduler \
 907      (current_target.to_has_thread_control & tc_schedlock)
 908
 909 #define target_can_switch_threads \
 910      (current_target.to_has_thread_control & tc_switch)
 911
 912 /* Can the target support asynchronous execution? */
 913 #define target_can_async_p() (current_target.to_can_async_p ())
 914
 915 /* Is the target in asynchronous execution mode? */
 916 #define target_is_async_p() (current_target.to_is_async_p())
 917
 918 /* Put the target in async mode with the specified callback function. */
 919 #define target_async(CALLBACK,CONTEXT) \
 920      (current_target.to_async((CALLBACK), (CONTEXT)))
 921
 922 /* This is to be used ONLY within run_stack_dummy(). It
 923    provides a workaround, to have inferior function calls done in
 924    sychronous mode, even though the target is asynchronous. After
 925    target_async_mask(0) is called, calls to target_can_async_p() will
 926    return FALSE , so that target_resume() will not try to start the
 927    target asynchronously. After the inferior stops, we IMMEDIATELY
 928    restore the previous nature of the target, by calling
 929    target_async_mask(1). After that, target_can_async_p() will return
 930    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 931
 932    FIXME ezannoni 1999-12-13: we won't need this once we move
 933    the turning async on and off to the single execution commands,
 934    from where it is done currently, in remote_resume().  */
 935
 936 #define target_async_mask_value \
 937      (current_target.to_async_mask_value)
 938
 939 extern int target_async_mask (int mask);
 940
 941 extern void target_link (char *, CORE_ADDR *);
 942
 943 /* Converts a process id to a string.  Usually, the string just contains
 944    `process xyz', but on some systems it may contain
 945    `process xyz thread abc'.  */
 946
 947 #undef target_pid_to_str
 948 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
 949
 950 #ifndef target_tid_to_str
 951 #define target_tid_to_str(PID) \
 952      target_pid_to_str (PID)
 953 extern char *normal_pid_to_str (ptid_t ptid);
 954 #endif
 955
 956 /* Return a short string describing extra information about PID,
 957    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
 958    is okay.  */
 959
 960 #define target_extra_thread_info(TP) \
 961      (current_target.to_extra_thread_info (TP))
 962
 963 /*
 964  * New Objfile Event Hook:
 965  *
 966  * Sometimes a GDB component wants to get notified whenever a new
 967  * objfile is loaded.  Mainly this is used by thread-debugging
 968  * implementations that need to know when symbols for the target
 969  * thread implemenation are available.
 970  *
 971  * The old way of doing this is to define a macro 'target_new_objfile'
 972  * that points to the function that you want to be called on every
 973  * objfile/shlib load.
 974  *
 975  * The new way is to grab the function pointer, 'target_new_objfile_hook',
 976  * and point it to the function that you want to be called on every
 977  * objfile/shlib load.
 978  *
 979  * If multiple clients are willing to be cooperative, they can each
 980  * save a pointer to the previous value of target_new_objfile_hook
 981  * before modifying it, and arrange for their function to call the
 982  * previous function in the chain.  In that way, multiple clients
 983  * can receive this notification (something like with signal handlers).
 984  */
 985
 986 extern void (*target_new_objfile_hook) (struct objfile *);
 987
 988 #ifndef target_pid_or_tid_to_str
 989 #define target_pid_or_tid_to_str(ID) \
 990      target_pid_to_str (ID)
 991 #endif
 992
 993 /* Attempts to find the pathname of the executable file
 994    that was run to create a specified process.
 995
 996    The process PID must be stopped when this operation is used.
 997
 998    If the executable file cannot be determined, NULL is returned.
 999
1000    Else, a pointer to a character string containing the pathname
1001    is returned.  This string should be copied into a buffer by
1002    the client if the string will not be immediately used, or if
1003    it must persist.  */
1004
1005 #define target_pid_to_exec_file(pid) \
1006      (current_target.to_pid_to_exec_file) (pid)
1007
1008 /*
1009  * Iterator function for target memory regions.
1010  * Calls a callback function once for each memory region 'mapped'
1011  * in the child process.  Defined as a simple macro rather than
1012  * as a function macro so that it can be tested for nullity.
1013  */
1014
1015 #define target_find_memory_regions(FUNC, DATA) \
1016      (current_target.to_find_memory_regions) (FUNC, DATA)
1017
1018 /*
1019  * Compose corefile .note section.
1020  */
1021
1022 #define target_make_corefile_notes(BFD, SIZE_P) \
1023      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1024
1025 /* Hook to call target-dependent code after reading in a new symbol table.  */
1026
1027 #ifndef TARGET_SYMFILE_POSTREAD
1028 #define TARGET_SYMFILE_POSTREAD(OBJFILE)
1029 #endif
1030
1031 /* Hook to call target dependent code just after inferior target process has
1032    started.  */
1033
1034 #ifndef TARGET_CREATE_INFERIOR_HOOK
1035 #define TARGET_CREATE_INFERIOR_HOOK(PID)
1036 #endif
1037
1038 /* Hardware watchpoint interfaces.  */
1039
1040 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1041    write).  */
1042
1043 #ifndef STOPPED_BY_WATCHPOINT
1044 #define STOPPED_BY_WATCHPOINT(w) 0
1045 #endif
1046
1047 /* HP-UX supplies these operations, which respectively disable and enable
1048    the memory page-protections that are used to implement hardware watchpoints
1049    on that platform.  See wait_for_inferior's use of these.  */
1050
1051 #if !defined(TARGET_DISABLE_HW_WATCHPOINTS)
1052 #define TARGET_DISABLE_HW_WATCHPOINTS(pid)
1053 #endif
1054
1055 #if !defined(TARGET_ENABLE_HW_WATCHPOINTS)
1056 #define TARGET_ENABLE_HW_WATCHPOINTS(pid)
1057 #endif
1058
1059 /* Provide defaults for systems that don't support hardware watchpoints.  */
1060
1061 #ifndef TARGET_HAS_HARDWARE_WATCHPOINTS
1062
1063 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1064    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1065    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1066    (including this one?).  OTHERTYPE is who knows what...  */
1067
1068 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) 0
1069
1070 #if !defined(TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT)
1071 #define TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT(byte_count) \
1072      ((LONGEST)(byte_count) <= REGISTER_SIZE)
1073 #endif
1074
1075
1076 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1077    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1078    success, non-zero for failure.  */
1079
1080 #define target_remove_watchpoint(ADDR,LEN,TYPE) -1
1081 #define target_insert_watchpoint(ADDR,LEN,TYPE) -1
1082
1083 #endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */
1084
1085 #ifndef target_insert_hw_breakpoint
1086 #define target_remove_hw_breakpoint(ADDR,SHADOW) -1
1087 #define target_insert_hw_breakpoint(ADDR,SHADOW) -1
1088 #endif
1089
1090 #ifndef target_stopped_data_address
1091 #define target_stopped_data_address() 0
1092 #endif
1093
1094 /* If defined, then we need to decr pc by this much after a hardware break-
1095    point.  Presumably this overrides DECR_PC_AFTER_BREAK...  */
1096
1097 #ifndef DECR_PC_AFTER_HW_BREAK
1098 #define DECR_PC_AFTER_HW_BREAK 0
1099 #endif
1100
1101 /* Sometimes gdb may pick up what appears to be a valid target address
1102    from a minimal symbol, but the value really means, essentially,
1103    "This is an index into a table which is populated when the inferior
1104    is run.  Therefore, do not attempt to use this as a PC."  */
1105
1106 #if !defined(PC_REQUIRES_RUN_BEFORE_USE)
1107 #define PC_REQUIRES_RUN_BEFORE_USE(pc) (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), resuming a newly vforked
1114    child process after it has exec'd, causes the parent process to resume as
1115    well.  To prevent the parent from running spontaneously, such targets should
1116    define this to a function that prevents that from happening.  */
1117 #if !defined(ENSURE_VFORKING_PARENT_REMAINS_STOPPED)
1118 #define ENSURE_VFORKING_PARENT_REMAINS_STOPPED(PID) (0)
1119 #endif
1120
1121 /* This will only be defined by a target that supports catching vfork events,
1122    such as HP-UX.
1123
1124    On some targets (such as HP-UX 10.20 and earlier), a newly vforked child
1125    process must be resumed when it delivers its exec event, before the parent
1126    vfork event will be delivered to us.  */
1127
1128 #if !defined(RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK)
1129 #define RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK() (0)
1130 #endif
1131
1132 /* Routines for maintenance of the target structures...
1133
1134    add_target:   Add a target to the list of all possible targets.
1135
1136    push_target:  Make this target the top of the stack of currently used
1137    targets, within its particular stratum of the stack.  Result
1138    is 0 if now atop the stack, nonzero if not on top (maybe
1139    should warn user).
1140
1141    unpush_target: Remove this from the stack of currently used targets,
1142    no matter where it is on the list.  Returns 0 if no
1143    change, 1 if removed from stack.
1144
1145    pop_target:   Remove the top thing on the stack of current targets.  */
1146
1147 extern void add_target (struct target_ops *);
1148
1149 extern int push_target (struct target_ops *);
1150
1151 extern int unpush_target (struct target_ops *);
1152
1153 extern void target_preopen (int);
1154
1155 extern void pop_target (void);
1156
1157 /* Struct section_table maps address ranges to file sections.  It is
1158    mostly used with BFD files, but can be used without (e.g. for handling
1159    raw disks, or files not in formats handled by BFD).  */
1160
1161 struct section_table
1162   {
1163     CORE_ADDR addr;             /* Lowest address in section */
1164     CORE_ADDR endaddr;          /* 1+highest address in section */
1165
1166     sec_ptr the_bfd_section;
1167
1168     bfd *bfd;                   /* BFD file pointer */
1169   };
1170
1171 /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
1172    Returns 0 if OK, 1 on error.  */
1173
1174 extern int
1175 build_section_table (bfd *, struct section_table **, struct section_table **);
1176
1177 /* From mem-break.c */
1178
1179 extern int memory_remove_breakpoint (CORE_ADDR, char *);
1180
1181 extern int memory_insert_breakpoint (CORE_ADDR, char *);
1182
1183 extern int default_memory_remove_breakpoint (CORE_ADDR, char *);
1184
1185 extern int default_memory_insert_breakpoint (CORE_ADDR, char *);
1186
1187 extern const unsigned char *memory_breakpoint_from_pc (CORE_ADDR *pcptr,
1188                                                        int *lenptr);
1189
1190
1191 /* From target.c */
1192
1193 extern void initialize_targets (void);
1194
1195 extern void noprocess (void);
1196
1197 extern void find_default_attach (char *, int);
1198
1199 extern void find_default_require_attach (char *, int);
1200
1201 extern void find_default_require_detach (int, char *, int);
1202
1203 extern void find_default_create_inferior (char *, char *, char **);
1204
1205 extern void find_default_clone_and_follow_inferior (int, int *);
1206
1207 extern struct target_ops *find_run_target (void);
1208
1209 extern struct target_ops *find_core_target (void);
1210
1211 extern struct target_ops *find_target_beneath (struct target_ops *);
1212
1213 extern int
1214 target_resize_to_sections (struct target_ops *target, int num_added);
1215
1216 extern void remove_target_sections (bfd *abfd);
1217
1218 \f
1219 /* Stuff that should be shared among the various remote targets.  */
1220
1221 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1222    information (higher values, more information).  */
1223 extern int remote_debug;
1224
1225 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1226 extern int baud_rate;
1227 /* Timeout limit for response from target. */
1228 extern int remote_timeout;
1229
1230 \f
1231 /* Functions for helping to write a native target.  */
1232
1233 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1234 extern void store_waitstatus (struct target_waitstatus *, int);
1235
1236 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1237    targ_signal SIGNO has an equivalent ``host'' representation.  */
1238 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1239    to the shorter target_signal_p() because it is far less ambigious.
1240    In this context ``target_signal'' refers to GDB's internal
1241    representation of the target's set of signals while ``host signal''
1242    refers to the target operating system's signal.  Confused?  */
1243
1244 extern int target_signal_to_host_p (enum target_signal signo);
1245
1246 /* Convert between host signal numbers and enum target_signal's.
1247    target_signal_to_host() returns 0 and prints a warning() on GDB's
1248    console if SIGNO has no equivalent host representation.  */
1249 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1250    refering to the target operating system's signal numbering.
1251    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1252    gdb_signal'' would probably be better as it is refering to GDB's
1253    internal representation of a target operating system's signal.  */
1254
1255 extern enum target_signal target_signal_from_host (int);
1256 extern int target_signal_to_host (enum target_signal);
1257
1258 /* Convert from a number used in a GDB command to an enum target_signal.  */
1259 extern enum target_signal target_signal_from_command (int);
1260
1261 /* Any target can call this to switch to remote protocol (in remote.c). */
1262 extern void push_remote_target (char *name, int from_tty);
1263 \f
1264 /* Imported from machine dependent code */
1265
1266 /* Blank target vector entries are initialized to target_ignore. */
1267 void target_ignore (void);
1268
1269 #endif /* !defined (TARGET_H) */