gdb/target.h

   1 /* Interface between GDB and target environments, including files and processes
   2
   3    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   4    1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
   5
   6    Contributed by Cygnus Support.  Written by John Gilmore.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 59 Temple Place - Suite 330,
  23    Boston, MA 02111-1307, USA.  */
  24
  25 #if !defined (TARGET_H)
  26 #define TARGET_H
  27
  28 struct objfile;
  29 struct ui_file;
  30 struct mem_attrib;
  31 struct target_ops;
  32
  33 /* This include file defines the interface between the main part
  34    of the debugger, and the part which is target-specific, or
  35    specific to the communications interface between us and the
  36    target.
  37
  38    A TARGET is an interface between the debugger and a particular
  39    kind of file or process.  Targets can be STACKED in STRATA,
  40    so that more than one target can potentially respond to a request.
  41    In particular, memory accesses will walk down the stack of targets
  42    until they find a target that is interested in handling that particular
  43    address.  STRATA are artificial boundaries on the stack, within
  44    which particular kinds of targets live.  Strata exist so that
  45    people don't get confused by pushing e.g. a process target and then
  46    a file target, and wondering why they can't see the current values
  47    of variables any more (the file target is handling them and they
  48    never get to the process target).  So when you push a file target,
  49    it goes into the file stratum, which is always below the process
  50    stratum.  */
  51
  52 #include "bfd.h"
  53 #include "symtab.h"
  54 #include "dcache.h"
  55 #include "memattr.h"
  56
  57 enum strata
  58   {
  59     dummy_stratum,              /* The lowest of the low */
  60     file_stratum,               /* Executable files, etc */
  61     core_stratum,               /* Core dump files */
  62     download_stratum,           /* Downloading of remote targets */
  63     process_stratum,            /* Executing processes */
  64     thread_stratum              /* Executing threads */
  65   };
  66
  67 enum thread_control_capabilities
  68   {
  69     tc_none = 0,                /* Default: can't control thread execution.  */
  70     tc_schedlock = 1,           /* Can lock the thread scheduler.  */
  71     tc_switch = 2               /* Can switch the running thread on demand.  */
  72   };
  73
  74 /* Stuff for target_wait.  */
  75
  76 /* Generally, what has the program done?  */
  77 enum target_waitkind
  78   {
  79     /* The program has exited.  The exit status is in value.integer.  */
  80     TARGET_WAITKIND_EXITED,
  81
  82     /* The program has stopped with a signal.  Which signal is in
  83        value.sig.  */
  84     TARGET_WAITKIND_STOPPED,
  85
  86     /* The program has terminated with a signal.  Which signal is in
  87        value.sig.  */
  88     TARGET_WAITKIND_SIGNALLED,
  89
  90     /* The program is letting us know that it dynamically loaded something
  91        (e.g. it called load(2) on AIX).  */
  92     TARGET_WAITKIND_LOADED,
  93
  94     /* The program has forked.  A "related" process' ID is in
  95        value.related_pid.  I.e., if the child forks, value.related_pid
  96        is the parent's ID.  */
  97
  98     TARGET_WAITKIND_FORKED,
  99
 100     /* The program has vforked.  A "related" process's ID is in
 101        value.related_pid.  */
 102
 103     TARGET_WAITKIND_VFORKED,
 104
 105     /* The program has exec'ed a new executable file.  The new file's
 106        pathname is pointed to by value.execd_pathname.  */
 107
 108     TARGET_WAITKIND_EXECD,
 109
 110     /* The program has entered or returned from a system call.  On
 111        HP-UX, this is used in the hardware watchpoint implementation.
 112        The syscall's unique integer ID number is in value.syscall_id */
 113
 114     TARGET_WAITKIND_SYSCALL_ENTRY,
 115     TARGET_WAITKIND_SYSCALL_RETURN,
 116
 117     /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 118        within target_wait, but I'm not sure target_wait should be resuming the
 119        inferior.  */
 120     TARGET_WAITKIND_SPURIOUS,
 121
 122     /* An event has occured, but we should wait again.
 123        Remote_async_wait() returns this when there is an event
 124        on the inferior, but the rest of the world is not interested in
 125        it. The inferior has not stopped, but has just sent some output
 126        to the console, for instance. In this case, we want to go back
 127        to the event loop and wait there for another event from the
 128        inferior, rather than being stuck in the remote_async_wait()
 129        function. This way the event loop is responsive to other events,
 130        like for instance the user typing.  */
 131     TARGET_WAITKIND_IGNORE
 132   };
 133
 134 struct target_waitstatus
 135   {
 136     enum target_waitkind kind;
 137
 138     /* Forked child pid, execd pathname, exit status or signal number.  */
 139     union
 140       {
 141         int integer;
 142         enum target_signal sig;
 143         int related_pid;
 144         char *execd_pathname;
 145         int syscall_id;
 146       }
 147     value;
 148   };
 149
 150 /* Possible types of events that the inferior handler will have to
 151    deal with.  */
 152 enum inferior_event_type
 153   {
 154     /* There is a request to quit the inferior, abandon it.  */
 155     INF_QUIT_REQ,
 156     /* Process a normal inferior event which will result in target_wait
 157        being called.  */
 158     INF_REG_EVENT,
 159     /* Deal with an error on the inferior.  */
 160     INF_ERROR,
 161     /* We are called because a timer went off.  */
 162     INF_TIMER,
 163     /* We are called to do stuff after the inferior stops.  */
 164     INF_EXEC_COMPLETE,
 165     /* We are called to do some stuff after the inferior stops, but we
 166        are expected to reenter the proceed() and
 167        handle_inferior_event() functions. This is used only in case of
 168        'step n' like commands.  */
 169     INF_EXEC_CONTINUE
 170   };
 171
 172 /* Return the string for a signal.  */
 173 extern char *target_signal_to_string (enum target_signal);
 174
 175 /* Return the name (SIGHUP, etc.) for a signal.  */
 176 extern char *target_signal_to_name (enum target_signal);
 177
 178 /* Given a name (SIGHUP, etc.), return its signal.  */
 179 enum target_signal target_signal_from_name (char *);
 180 \f
 181 /* Request the transfer of up to LEN 8-bit bytes of the target's
 182    OBJECT.  The OFFSET, for a seekable object, specifies the starting
 183    point.  The ANNEX can be used to provide additional data-specific
 184    information to the target.
 185
 186    Return the number of bytes actually transfered, zero when no
 187    further transfer is possible, and -1 when the transfer is not
 188    supported.
 189
 190    NOTE: cagney/2003-10-17: The current interface does not support a
 191    "retry" mechanism.  Instead it assumes that at least one byte will
 192    be transfered on each call.
 193
 194    NOTE: cagney/2003-10-17: The current interface can lead to
 195    fragmented transfers.  Lower target levels should not implement
 196    hacks, such as enlarging the transfer, in an attempt to compensate
 197    for this.  Instead, the target stack should be extended so that it
 198    implements supply/collect methods and a look-aside object cache.
 199    With that available, the lowest target can safely and freely "push"
 200    data up the stack.
 201
 202    NOTE: cagney/2003-10-17: Unlike the old query and the memory
 203    transfer mechanisms, these methods are explicitly parameterized by
 204    the target that it should be applied to.
 205
 206    NOTE: cagney/2003-10-17: Just like the old query and memory xfer
 207    methods, these new methods perform partial transfers.  The only
 208    difference is that these new methods thought to include "partial"
 209    in the name.  The old code's failure to do this lead to much
 210    confusion and duplication of effort as each target object attempted
 211    to locally take responsibility for something it didn't have to
 212    worry about.
 213
 214    NOTE: cagney/2003-10-17: With a TARGET_OBJECT_KOD object, for
 215    backward compatibility with the "target_query" method that this
 216    replaced, when OFFSET and LEN are both zero, return the "minimum"
 217    buffer size.  See "remote.c" for further information.  */
 218
 219 enum target_object
 220 {
 221   /* Kernel Object Display transfer.  See "kod.c" and "remote.c".  */
 222   TARGET_OBJECT_KOD,
 223   /* AVR target specific transfer.  See "avr-tdep.c" and "remote.c".  */
 224   TARGET_OBJECT_AVR,
 225   /* Transfer up-to LEN bytes of memory starting at OFFSET.  */
 226   TARGET_OBJECT_MEMORY,
 227   /* Kernel Unwind Table.  See "ia64-tdep.c".  */
 228   TARGET_OBJECT_UNWIND_TABLE,
 229   /* Transfer auxilliary vector.  */
 230   TARGET_OBJECT_AUXV,
 231   /* StackGhost cookie.  See "sparc-tdep.c".  */
 232   TARGET_OBJECT_WCOOKIE
 233
 234   /* Possible future objects: TARGET_OBJECT_FILE, TARGET_OBJECT_PROC, ... */
 235 };
 236
 237 extern LONGEST target_read_partial (struct target_ops *ops,
 238                                     enum target_object object,
 239                                     const char *annex, void *buf,
 240                                     ULONGEST offset, LONGEST len);
 241
 242 extern LONGEST target_write_partial (struct target_ops *ops,
 243                                      enum target_object object,
 244                                      const char *annex, const void *buf,
 245                                      ULONGEST offset, LONGEST len);
 246
 247 /* Wrappers to perform the full transfer.  */
 248 extern LONGEST target_read (struct target_ops *ops,
 249                             enum target_object object,
 250                             const char *annex, void *buf,
 251                             ULONGEST offset, LONGEST len);
 252
 253 extern LONGEST target_write (struct target_ops *ops,
 254                              enum target_object object,
 255                              const char *annex, const void *buf,
 256                              ULONGEST offset, LONGEST len);
 257
 258 /* Wrappers to target read/write that perform memory transfers.  They
 259    throw an error if the memory transfer fails.
 260
 261    NOTE: cagney/2003-10-23: The naming schema is lifted from
 262    "frame.h".  The parameter order is lifted from get_frame_memory,
 263    which in turn lifted it from read_memory.  */
 264
 265 extern void get_target_memory (struct target_ops *ops, CORE_ADDR addr,
 266                                void *buf, LONGEST len);
 267 extern ULONGEST get_target_memory_unsigned (struct target_ops *ops,
 268                                             CORE_ADDR addr, int len);
 269 \f
 270
 271 /* If certain kinds of activity happen, target_wait should perform
 272    callbacks.  */
 273 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 274    on TARGET_ACTIVITY_FD.  */
 275 extern int target_activity_fd;
 276 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 277 extern int (*target_activity_function) (void);
 278 \f
 279 struct thread_info;             /* fwd decl for parameter list below: */
 280
 281 struct target_ops
 282   {
 283     struct target_ops *beneath; /* To the target under this one.  */
 284     char *to_shortname;         /* Name this target type */
 285     char *to_longname;          /* Name for printing */
 286     char *to_doc;               /* Documentation.  Does not include trailing
 287                                    newline, and starts with a one-line descrip-
 288                                    tion (probably similar to to_longname).  */
 289     /* Per-target scratch pad.  */
 290     void *to_data;
 291     /* The open routine takes the rest of the parameters from the
 292        command, and (if successful) pushes a new target onto the
 293        stack.  Targets should supply this routine, if only to provide
 294        an error message.  */
 295     void (*to_open) (char *, int);
 296     /* Old targets with a static target vector provide "to_close".
 297        New re-entrant targets provide "to_xclose" and that is expected
 298        to xfree everything (including the "struct target_ops").  */
 299     void (*to_xclose) (struct target_ops *targ, int quitting);
 300     void (*to_close) (int);
 301     void (*to_attach) (char *, int);
 302     void (*to_post_attach) (int);
 303     void (*to_detach) (char *, int);
 304     void (*to_disconnect) (char *, int);
 305     void (*to_resume) (ptid_t, int, enum target_signal);
 306     ptid_t (*to_wait) (ptid_t, struct target_waitstatus *);
 307     void (*to_fetch_registers) (int);
 308     void (*to_store_registers) (int);
 309     void (*to_prepare_to_store) (void);
 310
 311     /* Transfer LEN bytes of memory between GDB address MYADDR and
 312        target address MEMADDR.  If WRITE, transfer them to the target, else
 313        transfer them from the target.  TARGET is the target from which we
 314        get this function.
 315
 316        Return value, N, is one of the following:
 317
 318        0 means that we can't handle this.  If errno has been set, it is the
 319        error which prevented us from doing it (FIXME: What about bfd_error?).
 320
 321        positive (call it N) means that we have transferred N bytes
 322        starting at MEMADDR.  We might be able to handle more bytes
 323        beyond this length, but no promises.
 324
 325        negative (call its absolute value N) means that we cannot
 326        transfer right at MEMADDR, but we could transfer at least
 327        something at MEMADDR + N.
 328
 329        NOTE: cagney/2004-10-01: This has been entirely superseeded by
 330        to_xfer_partial and inferior inheritance.  */
 331
 332     int (*deprecated_xfer_memory) (CORE_ADDR memaddr, char *myaddr,
 333                                    int len, int write,
 334                                    struct mem_attrib *attrib,
 335                                    struct target_ops *target);
 336
 337     void (*to_files_info) (struct target_ops *);
 338     int (*to_insert_breakpoint) (CORE_ADDR, char *);
 339     int (*to_remove_breakpoint) (CORE_ADDR, char *);
 340     int (*to_can_use_hw_breakpoint) (int, int, int);
 341     int (*to_insert_hw_breakpoint) (CORE_ADDR, char *);
 342     int (*to_remove_hw_breakpoint) (CORE_ADDR, char *);
 343     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 344     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 345     int (*to_stopped_by_watchpoint) (void);
 346     int to_have_continuable_watchpoint;
 347     int (*to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
 348     int (*to_region_size_ok_for_hw_watchpoint) (int);
 349     void (*to_terminal_init) (void);
 350     void (*to_terminal_inferior) (void);
 351     void (*to_terminal_ours_for_output) (void);
 352     void (*to_terminal_ours) (void);
 353     void (*to_terminal_save_ours) (void);
 354     void (*to_terminal_info) (char *, int);
 355     void (*to_kill) (void);
 356     void (*to_load) (char *, int);
 357     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 358     void (*to_create_inferior) (char *, char *, char **, int);
 359     void (*to_post_startup_inferior) (ptid_t);
 360     void (*to_acknowledge_created_inferior) (int);
 361     void (*to_insert_fork_catchpoint) (int);
 362     int (*to_remove_fork_catchpoint) (int);
 363     void (*to_insert_vfork_catchpoint) (int);
 364     int (*to_remove_vfork_catchpoint) (int);
 365     int (*to_follow_fork) (int);
 366     void (*to_insert_exec_catchpoint) (int);
 367     int (*to_remove_exec_catchpoint) (int);
 368     int (*to_reported_exec_events_per_exec_call) (void);
 369     int (*to_has_exited) (int, int, int *);
 370     void (*to_mourn_inferior) (void);
 371     int (*to_can_run) (void);
 372     void (*to_notice_signals) (ptid_t ptid);
 373     int (*to_thread_alive) (ptid_t ptid);
 374     void (*to_find_new_threads) (void);
 375     char *(*to_pid_to_str) (ptid_t);
 376     char *(*to_extra_thread_info) (struct thread_info *);
 377     void (*to_stop) (void);
 378     void (*to_rcmd) (char *command, struct ui_file *output);
 379     struct symtab_and_line *(*to_enable_exception_callback) (enum
 380                                                              exception_event_kind,
 381                                                              int);
 382     struct exception_event_record *(*to_get_current_exception_event) (void);
 383     char *(*to_pid_to_exec_file) (int pid);
 384     enum strata to_stratum;
 385     int to_has_all_memory;
 386     int to_has_memory;
 387     int to_has_stack;
 388     int to_has_registers;
 389     int to_has_execution;
 390     int to_has_thread_control;  /* control thread execution */
 391     struct section_table
 392      *to_sections;
 393     struct section_table
 394      *to_sections_end;
 395     /* ASYNC target controls */
 396     int (*to_can_async_p) (void);
 397     int (*to_is_async_p) (void);
 398     void (*to_async) (void (*cb) (enum inferior_event_type, void *context),
 399                       void *context);
 400     int to_async_mask_value;
 401     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 402                                             unsigned long,
 403                                             int, int, int,
 404                                             void *),
 405                                    void *);
 406     char * (*to_make_corefile_notes) (bfd *, int *);
 407
 408     /* Return the thread-local address at OFFSET in the
 409        thread-local storage for the thread PTID and the shared library
 410        or executable file given by OBJFILE.  If that block of
 411        thread-local storage hasn't been allocated yet, this function
 412        may return an error.  */
 413     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 414                                               CORE_ADDR load_module_addr,
 415                                               CORE_ADDR offset);
 416
 417     /* Perform partial transfers on OBJECT.  See target_read_partial
 418        and target_write_partial for details of each variant.  One, and
 419        only one, of readbuf or writebuf must be non-NULL.  */
 420     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 421                                 enum target_object object, const char *annex,
 422                                 void *readbuf, const void *writebuf,
 423                                 ULONGEST offset, LONGEST len);
 424
 425     int to_magic;
 426     /* Need sub-structure for target machine related rather than comm related?
 427      */
 428   };
 429
 430 /* Magic number for checking ops size.  If a struct doesn't end with this
 431    number, somebody changed the declaration but didn't change all the
 432    places that initialize one.  */
 433
 434 #define OPS_MAGIC       3840
 435
 436 /* The ops structure for our "current" target process.  This should
 437    never be NULL.  If there is no target, it points to the dummy_target.  */
 438
 439 extern struct target_ops current_target;
 440
 441 /* Define easy words for doing these operations on our current target.  */
 442
 443 #define target_shortname        (current_target.to_shortname)
 444 #define target_longname         (current_target.to_longname)
 445
 446 /* Does whatever cleanup is required for a target that we are no
 447    longer going to be calling.  QUITTING indicates that GDB is exiting
 448    and should not get hung on an error (otherwise it is important to
 449    perform clean termination, even if it takes a while).  This routine
 450    is automatically always called when popping the target off the
 451    target stack (to_beneath is undefined).  Closing file descriptors
 452    and freeing all memory allocated memory are typical things it
 453    should do.  */
 454
 455 void target_close (struct target_ops *targ, int quitting);
 456
 457 /* Attaches to a process on the target side.  Arguments are as passed
 458    to the `attach' command by the user.  This routine can be called
 459    when the target is not on the target-stack, if the target_can_run
 460    routine returns 1; in that case, it must push itself onto the stack.
 461    Upon exit, the target should be ready for normal operations, and
 462    should be ready to deliver the status of the process immediately
 463    (without waiting) to an upcoming target_wait call.  */
 464
 465 #define target_attach(args, from_tty)   \
 466      (*current_target.to_attach) (args, from_tty)
 467
 468 /* The target_attach operation places a process under debugger control,
 469    and stops the process.
 470
 471    This operation provides a target-specific hook that allows the
 472    necessary bookkeeping to be performed after an attach completes.  */
 473 #define target_post_attach(pid) \
 474      (*current_target.to_post_attach) (pid)
 475
 476 /* Takes a program previously attached to and detaches it.
 477    The program may resume execution (some targets do, some don't) and will
 478    no longer stop on signals, etc.  We better not have left any breakpoints
 479    in the program or it'll die when it hits one.  ARGS is arguments
 480    typed by the user (e.g. a signal to send the process).  FROM_TTY
 481    says whether to be verbose or not.  */
 482
 483 extern void target_detach (char *, int);
 484
 485 /* Disconnect from the current target without resuming it (leaving it
 486    waiting for a debugger).  */
 487
 488 extern void target_disconnect (char *, int);
 489
 490 /* Resume execution of the target process PTID.  STEP says whether to
 491    single-step or to run free; SIGGNAL is the signal to be given to
 492    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 493    pass TARGET_SIGNAL_DEFAULT.  */
 494
 495 #define target_resume(ptid, step, siggnal)                              \
 496   do {                                                                  \
 497     dcache_invalidate(target_dcache);                                   \
 498     (*current_target.to_resume) (ptid, step, siggnal);                  \
 499   } while (0)
 500
 501 /* Wait for process pid to do something.  PTID = -1 to wait for any
 502    pid to do something.  Return pid of child, or -1 in case of error;
 503    store status through argument pointer STATUS.  Note that it is
 504    _NOT_ OK to throw_exception() out of target_wait() without popping
 505    the debugging target from the stack; GDB isn't prepared to get back
 506    to the prompt with a debugging target but without the frame cache,
 507    stop_pc, etc., set up.  */
 508
 509 #define target_wait(ptid, status)               \
 510      (*current_target.to_wait) (ptid, status)
 511
 512 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 513
 514 #define target_fetch_registers(regno)   \
 515      (*current_target.to_fetch_registers) (regno)
 516
 517 /* Store at least register REGNO, or all regs if REGNO == -1.
 518    It can store as many registers as it wants to, so target_prepare_to_store
 519    must have been previously called.  Calls error() if there are problems.  */
 520
 521 #define target_store_registers(regs)    \
 522      (*current_target.to_store_registers) (regs)
 523
 524 /* Get ready to modify the registers array.  On machines which store
 525    individual registers, this doesn't need to do anything.  On machines
 526    which store all the registers in one fell swoop, this makes sure
 527    that REGISTERS contains all the registers from the program being
 528    debugged.  */
 529
 530 #define target_prepare_to_store()       \
 531      (*current_target.to_prepare_to_store) ()
 532
 533 extern DCACHE *target_dcache;
 534
 535 extern int do_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
 536                            struct mem_attrib *attrib);
 537
 538 extern int target_read_string (CORE_ADDR, char **, int, int *);
 539
 540 extern int target_read_memory (CORE_ADDR memaddr, bfd_byte *myaddr, int len);
 541
 542 extern int target_write_memory (CORE_ADDR memaddr, const bfd_byte *myaddr,
 543                                 int len);
 544
 545 extern int xfer_memory (CORE_ADDR, char *, int, int,
 546                         struct mem_attrib *, struct target_ops *);
 547
 548 extern int child_xfer_memory (CORE_ADDR, char *, int, int,
 549                               struct mem_attrib *, struct target_ops *);
 550
 551 /* Make a single attempt at transfering LEN bytes.  On a successful
 552    transfer, the number of bytes actually transfered is returned and
 553    ERR is set to 0.  When a transfer fails, -1 is returned (the number
 554    of bytes actually transfered is not defined) and ERR is set to a
 555    non-zero error indication.  */
 556
 557 extern int target_read_memory_partial (CORE_ADDR addr, char *buf, int len,
 558                                        int *err);
 559
 560 extern int target_write_memory_partial (CORE_ADDR addr, char *buf, int len,
 561                                         int *err);
 562
 563 extern char *child_pid_to_exec_file (int);
 564
 565 extern char *child_core_file_to_sym_file (char *);
 566
 567 #if defined(CHILD_POST_ATTACH)
 568 extern void child_post_attach (int);
 569 #endif
 570
 571 extern void child_post_startup_inferior (ptid_t);
 572
 573 extern void child_acknowledge_created_inferior (int);
 574
 575 extern void child_insert_fork_catchpoint (int);
 576
 577 extern int child_remove_fork_catchpoint (int);
 578
 579 extern void child_insert_vfork_catchpoint (int);
 580
 581 extern int child_remove_vfork_catchpoint (int);
 582
 583 extern void child_acknowledge_created_inferior (int);
 584
 585 extern int child_follow_fork (int);
 586
 587 extern void child_insert_exec_catchpoint (int);
 588
 589 extern int child_remove_exec_catchpoint (int);
 590
 591 extern int child_reported_exec_events_per_exec_call (void);
 592
 593 extern int child_has_exited (int, int, int *);
 594
 595 extern int child_thread_alive (ptid_t);
 596
 597 /* From infrun.c.  */
 598
 599 extern int inferior_has_forked (int pid, int *child_pid);
 600
 601 extern int inferior_has_vforked (int pid, int *child_pid);
 602
 603 extern int inferior_has_execd (int pid, char **execd_pathname);
 604
 605 /* From exec.c */
 606
 607 extern void print_section_info (struct target_ops *, bfd *);
 608
 609 /* Print a line about the current target.  */
 610
 611 #define target_files_info()     \
 612      (*current_target.to_files_info) (&current_target)
 613
 614 /* Insert a breakpoint at address ADDR in the target machine.  SAVE is
 615    a pointer to memory allocated for saving the target contents.  It
 616    is guaranteed by the caller to be long enough to save the number of
 617    breakpoint bytes indicated by BREAKPOINT_FROM_PC.  Result is 0 for
 618    success, or an errno value.  */
 619
 620 #define target_insert_breakpoint(addr, save)    \
 621      (*current_target.to_insert_breakpoint) (addr, save)
 622
 623 /* Remove a breakpoint at address ADDR in the target machine.
 624    SAVE is a pointer to the same save area
 625    that was previously passed to target_insert_breakpoint.
 626    Result is 0 for success, or an errno value.  */
 627
 628 #define target_remove_breakpoint(addr, save)    \
 629      (*current_target.to_remove_breakpoint) (addr, save)
 630
 631 /* Initialize the terminal settings we record for the inferior,
 632    before we actually run the inferior.  */
 633
 634 #define target_terminal_init() \
 635      (*current_target.to_terminal_init) ()
 636
 637 /* Put the inferior's terminal settings into effect.
 638    This is preparation for starting or resuming the inferior.  */
 639
 640 #define target_terminal_inferior() \
 641      (*current_target.to_terminal_inferior) ()
 642
 643 /* Put some of our terminal settings into effect,
 644    enough to get proper results from our output,
 645    but do not change into or out of RAW mode
 646    so that no input is discarded.
 647
 648    After doing this, either terminal_ours or terminal_inferior
 649    should be called to get back to a normal state of affairs.  */
 650
 651 #define target_terminal_ours_for_output() \
 652      (*current_target.to_terminal_ours_for_output) ()
 653
 654 /* Put our terminal settings into effect.
 655    First record the inferior's terminal settings
 656    so they can be restored properly later.  */
 657
 658 #define target_terminal_ours() \
 659      (*current_target.to_terminal_ours) ()
 660
 661 /* Save our terminal settings.
 662    This is called from TUI after entering or leaving the curses
 663    mode.  Since curses modifies our terminal this call is here
 664    to take this change into account.  */
 665
 666 #define target_terminal_save_ours() \
 667      (*current_target.to_terminal_save_ours) ()
 668
 669 /* Print useful information about our terminal status, if such a thing
 670    exists.  */
 671
 672 #define target_terminal_info(arg, from_tty) \
 673      (*current_target.to_terminal_info) (arg, from_tty)
 674
 675 /* Kill the inferior process.   Make it go away.  */
 676
 677 #define target_kill() \
 678      (*current_target.to_kill) ()
 679
 680 /* Load an executable file into the target process.  This is expected
 681    to not only bring new code into the target process, but also to
 682    update GDB's symbol tables to match.  */
 683
 684 extern void target_load (char *arg, int from_tty);
 685
 686 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 687    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 688    symbol should be returned.  The result is 0 if successful, nonzero
 689    if the symbol does not exist in the target environment.  This
 690    function should not call error() if communication with the target
 691    is interrupted, since it is called from symbol reading, but should
 692    return nonzero, possibly doing a complain().  */
 693
 694 #define target_lookup_symbol(name, addrp) \
 695      (*current_target.to_lookup_symbol) (name, addrp)
 696
 697 /* Start an inferior process and set inferior_ptid to its pid.
 698    EXEC_FILE is the file to run.
 699    ALLARGS is a string containing the arguments to the program.
 700    ENV is the environment vector to pass.  Errors reported with error().
 701    On VxWorks and various standalone systems, we ignore exec_file.  */
 702
 703 #define target_create_inferior(exec_file, args, env, FROM_TTY)  \
 704      (*current_target.to_create_inferior) (exec_file, args, env, (FROM_TTY))
 705
 706
 707 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 708    notification of inferior events such as fork and vork immediately
 709    after the inferior is created.  (This because of how gdb gets an
 710    inferior created via invoking a shell to do it.  In such a scenario,
 711    if the shell init file has commands in it, the shell will fork and
 712    exec for each of those commands, and we will see each such fork
 713    event.  Very bad.)
 714
 715    Such targets will supply an appropriate definition for this function.  */
 716
 717 #define target_post_startup_inferior(ptid) \
 718      (*current_target.to_post_startup_inferior) (ptid)
 719
 720 /* On some targets, the sequence of starting up an inferior requires
 721    some synchronization between gdb and the new inferior process, PID.  */
 722
 723 #define target_acknowledge_created_inferior(pid) \
 724      (*current_target.to_acknowledge_created_inferior) (pid)
 725
 726 /* On some targets, we can catch an inferior fork or vfork event when
 727    it occurs.  These functions insert/remove an already-created
 728    catchpoint for such events.  */
 729
 730 #define target_insert_fork_catchpoint(pid) \
 731      (*current_target.to_insert_fork_catchpoint) (pid)
 732
 733 #define target_remove_fork_catchpoint(pid) \
 734      (*current_target.to_remove_fork_catchpoint) (pid)
 735
 736 #define target_insert_vfork_catchpoint(pid) \
 737      (*current_target.to_insert_vfork_catchpoint) (pid)
 738
 739 #define target_remove_vfork_catchpoint(pid) \
 740      (*current_target.to_remove_vfork_catchpoint) (pid)
 741
 742 /* If the inferior forks or vforks, this function will be called at
 743    the next resume in order to perform any bookkeeping and fiddling
 744    necessary to continue debugging either the parent or child, as
 745    requested, and releasing the other.  Information about the fork
 746    or vfork event is available via get_last_target_status ().
 747    This function returns 1 if the inferior should not be resumed
 748    (i.e. there is another event pending).  */
 749
 750 #define target_follow_fork(follow_child) \
 751      (*current_target.to_follow_fork) (follow_child)
 752
 753 /* On some targets, we can catch an inferior exec event when it
 754    occurs.  These functions insert/remove an already-created
 755    catchpoint for such events.  */
 756
 757 #define target_insert_exec_catchpoint(pid) \
 758      (*current_target.to_insert_exec_catchpoint) (pid)
 759
 760 #define target_remove_exec_catchpoint(pid) \
 761      (*current_target.to_remove_exec_catchpoint) (pid)
 762
 763 /* Returns the number of exec events that are reported when a process
 764    invokes a flavor of the exec() system call on this target, if exec
 765    events are being reported.  */
 766
 767 #define target_reported_exec_events_per_exec_call() \
 768      (*current_target.to_reported_exec_events_per_exec_call) ()
 769
 770 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 771    exit code of PID, if any.  */
 772
 773 #define target_has_exited(pid,wait_status,exit_status) \
 774      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 775
 776 /* The debugger has completed a blocking wait() call.  There is now
 777    some process event that must be processed.  This function should
 778    be defined by those targets that require the debugger to perform
 779    cleanup or internal state changes in response to the process event.  */
 780
 781 /* The inferior process has died.  Do what is right.  */
 782
 783 #define target_mourn_inferior() \
 784      (*current_target.to_mourn_inferior) ()
 785
 786 /* Does target have enough data to do a run or attach command? */
 787
 788 #define target_can_run(t) \
 789      ((t)->to_can_run) ()
 790
 791 /* post process changes to signal handling in the inferior.  */
 792
 793 #define target_notice_signals(ptid) \
 794      (*current_target.to_notice_signals) (ptid)
 795
 796 /* Check to see if a thread is still alive.  */
 797
 798 #define target_thread_alive(ptid) \
 799      (*current_target.to_thread_alive) (ptid)
 800
 801 /* Query for new threads and add them to the thread list.  */
 802
 803 #define target_find_new_threads() \
 804      (*current_target.to_find_new_threads) (); \
 805
 806 /* Make target stop in a continuable fashion.  (For instance, under
 807    Unix, this should act like SIGSTOP).  This function is normally
 808    used by GUIs to implement a stop button.  */
 809
 810 #define target_stop current_target.to_stop
 811
 812 /* Send the specified COMMAND to the target's monitor
 813    (shell,interpreter) for execution.  The result of the query is
 814    placed in OUTBUF.  */
 815
 816 #define target_rcmd(command, outbuf) \
 817      (*current_target.to_rcmd) (command, outbuf)
 818
 819
 820 /* Get the symbol information for a breakpointable routine called when
 821    an exception event occurs.
 822    Intended mainly for C++, and for those
 823    platforms/implementations where such a callback mechanism is available,
 824    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 825    different mechanisms for debugging exceptions.  */
 826
 827 #define target_enable_exception_callback(kind, enable) \
 828      (*current_target.to_enable_exception_callback) (kind, enable)
 829
 830 /* Get the current exception event kind -- throw or catch, etc.  */
 831
 832 #define target_get_current_exception_event() \
 833      (*current_target.to_get_current_exception_event) ()
 834
 835 /* Does the target include all of memory, or only part of it?  This
 836    determines whether we look up the target chain for other parts of
 837    memory if this target can't satisfy a request.  */
 838
 839 #define target_has_all_memory   \
 840      (current_target.to_has_all_memory)
 841
 842 /* Does the target include memory?  (Dummy targets don't.)  */
 843
 844 #define target_has_memory       \
 845      (current_target.to_has_memory)
 846
 847 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 848    we start a process.)  */
 849
 850 #define target_has_stack        \
 851      (current_target.to_has_stack)
 852
 853 /* Does the target have registers?  (Exec files don't.)  */
 854
 855 #define target_has_registers    \
 856      (current_target.to_has_registers)
 857
 858 /* Does the target have execution?  Can we make it jump (through
 859    hoops), or pop its stack a few times?  FIXME: If this is to work that
 860    way, it needs to check whether an inferior actually exists.
 861    remote-udi.c and probably other targets can be the current target
 862    when the inferior doesn't actually exist at the moment.  Right now
 863    this just tells us whether this target is *capable* of execution.  */
 864
 865 #define target_has_execution    \
 866      (current_target.to_has_execution)
 867
 868 /* Can the target support the debugger control of thread execution?
 869    a) Can it lock the thread scheduler?
 870    b) Can it switch the currently running thread?  */
 871
 872 #define target_can_lock_scheduler \
 873      (current_target.to_has_thread_control & tc_schedlock)
 874
 875 #define target_can_switch_threads \
 876      (current_target.to_has_thread_control & tc_switch)
 877
 878 /* Can the target support asynchronous execution? */
 879 #define target_can_async_p() (current_target.to_can_async_p ())
 880
 881 /* Is the target in asynchronous execution mode? */
 882 #define target_is_async_p() (current_target.to_is_async_p())
 883
 884 /* Put the target in async mode with the specified callback function. */
 885 #define target_async(CALLBACK,CONTEXT) \
 886      (current_target.to_async((CALLBACK), (CONTEXT)))
 887
 888 /* This is to be used ONLY within call_function_by_hand(). It provides
 889    a workaround, to have inferior function calls done in sychronous
 890    mode, even though the target is asynchronous. After
 891    target_async_mask(0) is called, calls to target_can_async_p() will
 892    return FALSE , so that target_resume() will not try to start the
 893    target asynchronously. After the inferior stops, we IMMEDIATELY
 894    restore the previous nature of the target, by calling
 895    target_async_mask(1). After that, target_can_async_p() will return
 896    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 897
 898    FIXME ezannoni 1999-12-13: we won't need this once we move
 899    the turning async on and off to the single execution commands,
 900    from where it is done currently, in remote_resume().  */
 901
 902 #define target_async_mask_value \
 903      (current_target.to_async_mask_value)
 904
 905 extern int target_async_mask (int mask);
 906
 907 extern void target_link (char *, CORE_ADDR *);
 908
 909 /* Converts a process id to a string.  Usually, the string just contains
 910    `process xyz', but on some systems it may contain
 911    `process xyz thread abc'.  */
 912
 913 #undef target_pid_to_str
 914 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
 915
 916 #ifndef target_tid_to_str
 917 #define target_tid_to_str(PID) \
 918      target_pid_to_str (PID)
 919 extern char *normal_pid_to_str (ptid_t ptid);
 920 #endif
 921
 922 /* Return a short string describing extra information about PID,
 923    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
 924    is okay.  */
 925
 926 #define target_extra_thread_info(TP) \
 927      (current_target.to_extra_thread_info (TP))
 928
 929 /*
 930  * New Objfile Event Hook:
 931  *
 932  * Sometimes a GDB component wants to get notified whenever a new
 933  * objfile is loaded.  Mainly this is used by thread-debugging
 934  * implementations that need to know when symbols for the target
 935  * thread implemenation are available.
 936  *
 937  * The old way of doing this is to define a macro 'target_new_objfile'
 938  * that points to the function that you want to be called on every
 939  * objfile/shlib load.
 940
 941    The new way is to grab the function pointer,
 942    'deprecated_target_new_objfile_hook', and point it to the function
 943    that you want to be called on every objfile/shlib load.
 944
 945    If multiple clients are willing to be cooperative, they can each
 946    save a pointer to the previous value of
 947    deprecated_target_new_objfile_hook before modifying it, and arrange
 948    for their function to call the previous function in the chain.  In
 949    that way, multiple clients can receive this notification (something
 950    like with signal handlers).  */
 951
 952 extern void (*deprecated_target_new_objfile_hook) (struct objfile *);
 953
 954 #ifndef target_pid_or_tid_to_str
 955 #define target_pid_or_tid_to_str(ID) \
 956      target_pid_to_str (ID)
 957 #endif
 958
 959 /* Attempts to find the pathname of the executable file
 960    that was run to create a specified process.
 961
 962    The process PID must be stopped when this operation is used.
 963
 964    If the executable file cannot be determined, NULL is returned.
 965
 966    Else, a pointer to a character string containing the pathname
 967    is returned.  This string should be copied into a buffer by
 968    the client if the string will not be immediately used, or if
 969    it must persist.  */
 970
 971 #define target_pid_to_exec_file(pid) \
 972      (current_target.to_pid_to_exec_file) (pid)
 973
 974 /*
 975  * Iterator function for target memory regions.
 976  * Calls a callback function once for each memory region 'mapped'
 977  * in the child process.  Defined as a simple macro rather than
 978  * as a function macro so that it can be tested for nullity.
 979  */
 980
 981 #define target_find_memory_regions(FUNC, DATA) \
 982      (current_target.to_find_memory_regions) (FUNC, DATA)
 983
 984 /*
 985  * Compose corefile .note section.
 986  */
 987
 988 #define target_make_corefile_notes(BFD, SIZE_P) \
 989      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
 990
 991 /* Thread-local values.  */
 992 #define target_get_thread_local_address \
 993     (current_target.to_get_thread_local_address)
 994 #define target_get_thread_local_address_p() \
 995     (target_get_thread_local_address != NULL)
 996
 997 /* Hook to call target dependent code just after inferior target process has
 998    started.  */
 999
1000 #ifndef TARGET_CREATE_INFERIOR_HOOK
1001 #define TARGET_CREATE_INFERIOR_HOOK(PID)
1002 #endif
1003
1004 /* Hardware watchpoint interfaces.  */
1005
1006 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1007    write).  */
1008
1009 #ifndef STOPPED_BY_WATCHPOINT
1010 #define STOPPED_BY_WATCHPOINT(w) \
1011    (*current_target.to_stopped_by_watchpoint) ()
1012 #endif
1013
1014 /* Non-zero if we have continuable watchpoints  */
1015
1016 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1017 #define HAVE_CONTINUABLE_WATCHPOINT \
1018    (current_target.to_have_continuable_watchpoint)
1019 #endif
1020
1021 /* Provide defaults for hardware watchpoint functions.  */
1022
1023 /* If the *_hw_beakpoint functions have not been defined
1024    elsewhere use the definitions in the target vector.  */
1025
1026 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1027    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1028    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1029    (including this one?).  OTHERTYPE is who knows what...  */
1030
1031 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1032 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1033  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1034 #endif
1035
1036 #if !defined(TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT)
1037 #define TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT(byte_count) \
1038     (*current_target.to_region_size_ok_for_hw_watchpoint) (byte_count)
1039 #endif
1040
1041
1042 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1043    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1044    success, non-zero for failure.  */
1045
1046 #ifndef target_insert_watchpoint
1047 #define target_insert_watchpoint(addr, len, type)       \
1048      (*current_target.to_insert_watchpoint) (addr, len, type)
1049
1050 #define target_remove_watchpoint(addr, len, type)       \
1051      (*current_target.to_remove_watchpoint) (addr, len, type)
1052 #endif
1053
1054 #ifndef target_insert_hw_breakpoint
1055 #define target_insert_hw_breakpoint(addr, save) \
1056      (*current_target.to_insert_hw_breakpoint) (addr, save)
1057
1058 #define target_remove_hw_breakpoint(addr, save) \
1059      (*current_target.to_remove_hw_breakpoint) (addr, save)
1060 #endif
1061
1062 extern int target_stopped_data_address_p (struct target_ops *);
1063
1064 #ifndef target_stopped_data_address
1065 #define target_stopped_data_address(target, x) \
1066     (*target.to_stopped_data_address) (target, x)
1067 #else
1068 /* Horrible hack to get around existing macros :-(.  */
1069 #define target_stopped_data_address_p(CURRENT_TARGET) (1)
1070 #endif
1071
1072 /* This will only be defined by a target that supports catching vfork events,
1073    such as HP-UX.
1074
1075    On some targets (such as HP-UX 10.20 and earlier), resuming a newly vforked
1076    child process after it has exec'd, causes the parent process to resume as
1077    well.  To prevent the parent from running spontaneously, such targets should
1078    define this to a function that prevents that from happening.  */
1079 #if !defined(ENSURE_VFORKING_PARENT_REMAINS_STOPPED)
1080 #define ENSURE_VFORKING_PARENT_REMAINS_STOPPED(PID) (0)
1081 #endif
1082
1083 /* This will only be defined by a target that supports catching vfork events,
1084    such as HP-UX.
1085
1086    On some targets (such as HP-UX 10.20 and earlier), a newly vforked child
1087    process must be resumed when it delivers its exec event, before the parent
1088    vfork event will be delivered to us.  */
1089
1090 #if !defined(RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK)
1091 #define RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK() (0)
1092 #endif
1093
1094 /* Routines for maintenance of the target structures...
1095
1096    add_target:   Add a target to the list of all possible targets.
1097
1098    push_target:  Make this target the top of the stack of currently used
1099    targets, within its particular stratum of the stack.  Result
1100    is 0 if now atop the stack, nonzero if not on top (maybe
1101    should warn user).
1102
1103    unpush_target: Remove this from the stack of currently used targets,
1104    no matter where it is on the list.  Returns 0 if no
1105    change, 1 if removed from stack.
1106
1107    pop_target:   Remove the top thing on the stack of current targets.  */
1108
1109 extern void add_target (struct target_ops *);
1110
1111 extern int push_target (struct target_ops *);
1112
1113 extern int unpush_target (struct target_ops *);
1114
1115 extern void target_preopen (int);
1116
1117 extern void pop_target (void);
1118
1119 /* Struct section_table maps address ranges to file sections.  It is
1120    mostly used with BFD files, but can be used without (e.g. for handling
1121    raw disks, or files not in formats handled by BFD).  */
1122
1123 struct section_table
1124   {
1125     CORE_ADDR addr;             /* Lowest address in section */
1126     CORE_ADDR endaddr;          /* 1+highest address in section */
1127
1128     struct bfd_section *the_bfd_section;
1129
1130     bfd *bfd;                   /* BFD file pointer */
1131   };
1132
1133 /* Return the "section" containing the specified address.  */
1134 struct section_table *target_section_by_addr (struct target_ops *target,
1135                                               CORE_ADDR addr);
1136
1137
1138 /* From mem-break.c */
1139
1140 extern int memory_remove_breakpoint (CORE_ADDR, char *);
1141
1142 extern int memory_insert_breakpoint (CORE_ADDR, char *);
1143
1144 extern int default_memory_remove_breakpoint (CORE_ADDR, char *);
1145
1146 extern int default_memory_insert_breakpoint (CORE_ADDR, char *);
1147
1148
1149 /* From target.c */
1150
1151 extern void initialize_targets (void);
1152
1153 extern void noprocess (void);
1154
1155 extern void find_default_attach (char *, int);
1156
1157 extern void find_default_create_inferior (char *, char *, char **, int);
1158
1159 extern struct target_ops *find_run_target (void);
1160
1161 extern struct target_ops *find_core_target (void);
1162
1163 extern struct target_ops *find_target_beneath (struct target_ops *);
1164
1165 extern int target_resize_to_sections (struct target_ops *target,
1166                                       int num_added);
1167
1168 extern void remove_target_sections (bfd *abfd);
1169
1170 \f
1171 /* Stuff that should be shared among the various remote targets.  */
1172
1173 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1174    information (higher values, more information).  */
1175 extern int remote_debug;
1176
1177 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1178 extern int baud_rate;
1179 /* Timeout limit for response from target. */
1180 extern int remote_timeout;
1181
1182 \f
1183 /* Functions for helping to write a native target.  */
1184
1185 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1186 extern void store_waitstatus (struct target_waitstatus *, int);
1187
1188 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1189    targ_signal SIGNO has an equivalent ``host'' representation.  */
1190 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1191    to the shorter target_signal_p() because it is far less ambigious.
1192    In this context ``target_signal'' refers to GDB's internal
1193    representation of the target's set of signals while ``host signal''
1194    refers to the target operating system's signal.  Confused?  */
1195
1196 extern int target_signal_to_host_p (enum target_signal signo);
1197
1198 /* Convert between host signal numbers and enum target_signal's.
1199    target_signal_to_host() returns 0 and prints a warning() on GDB's
1200    console if SIGNO has no equivalent host representation.  */
1201 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1202    refering to the target operating system's signal numbering.
1203    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1204    gdb_signal'' would probably be better as it is refering to GDB's
1205    internal representation of a target operating system's signal.  */
1206
1207 extern enum target_signal target_signal_from_host (int);
1208 extern int target_signal_to_host (enum target_signal);
1209
1210 /* Convert from a number used in a GDB command to an enum target_signal.  */
1211 extern enum target_signal target_signal_from_command (int);
1212
1213 /* Any target can call this to switch to remote protocol (in remote.c). */
1214 extern void push_remote_target (char *name, int from_tty);
1215 \f
1216 /* Imported from machine dependent code */
1217
1218 /* Blank target vector entries are initialized to target_ignore. */
1219 void target_ignore (void);
1220
1221 extern struct target_ops deprecated_child_ops;
1222
1223 #endif /* !defined (TARGET_H) */