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