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_post_wait) (ptid_t, int);
 308     void (*to_fetch_registers) (int);
 309     void (*to_store_registers) (int);
 310     void (*to_prepare_to_store) (void);
 311
 312     /* Transfer LEN bytes of memory between GDB address MYADDR and
 313        target address MEMADDR.  If WRITE, transfer them to the target, else
 314        transfer them from the target.  TARGET is the target from which we
 315        get this function.
 316
 317        Return value, N, is one of the following:
 318
 319        0 means that we can't handle this.  If errno has been set, it is the
 320        error which prevented us from doing it (FIXME: What about bfd_error?).
 321
 322        positive (call it N) means that we have transferred N bytes
 323        starting at MEMADDR.  We might be able to handle more bytes
 324        beyond this length, but no promises.
 325
 326        negative (call its absolute value N) means that we cannot
 327        transfer right at MEMADDR, but we could transfer at least
 328        something at MEMADDR + N.  */
 329
 330     int (*to_xfer_memory) (CORE_ADDR memaddr, char *myaddr,
 331                            int len, int write,
 332                            struct mem_attrib *attrib,
 333                            struct target_ops *target);
 334
 335     void (*to_files_info) (struct target_ops *);
 336     int (*to_insert_breakpoint) (CORE_ADDR, char *);
 337     int (*to_remove_breakpoint) (CORE_ADDR, char *);
 338     int (*to_can_use_hw_breakpoint) (int, int, int);
 339     int (*to_insert_hw_breakpoint) (CORE_ADDR, char *);
 340     int (*to_remove_hw_breakpoint) (CORE_ADDR, char *);
 341     int (*to_remove_watchpoint) (CORE_ADDR, int, int);
 342     int (*to_insert_watchpoint) (CORE_ADDR, int, int);
 343     int (*to_stopped_by_watchpoint) (void);
 344     int to_have_continuable_watchpoint;
 345     CORE_ADDR (*to_stopped_data_address) (void);
 346     int (*to_region_size_ok_for_hw_watchpoint) (int);
 347     void (*to_terminal_init) (void);
 348     void (*to_terminal_inferior) (void);
 349     void (*to_terminal_ours_for_output) (void);
 350     void (*to_terminal_ours) (void);
 351     void (*to_terminal_save_ours) (void);
 352     void (*to_terminal_info) (char *, int);
 353     void (*to_kill) (void);
 354     void (*to_load) (char *, int);
 355     int (*to_lookup_symbol) (char *, CORE_ADDR *);
 356     void (*to_create_inferior) (char *, char *, char **);
 357     void (*to_post_startup_inferior) (ptid_t);
 358     void (*to_acknowledge_created_inferior) (int);
 359     int (*to_insert_fork_catchpoint) (int);
 360     int (*to_remove_fork_catchpoint) (int);
 361     int (*to_insert_vfork_catchpoint) (int);
 362     int (*to_remove_vfork_catchpoint) (int);
 363     int (*to_follow_fork) (int);
 364     int (*to_insert_exec_catchpoint) (int);
 365     int (*to_remove_exec_catchpoint) (int);
 366     int (*to_reported_exec_events_per_exec_call) (void);
 367     int (*to_has_exited) (int, int, int *);
 368     void (*to_mourn_inferior) (void);
 369     int (*to_can_run) (void);
 370     void (*to_notice_signals) (ptid_t ptid);
 371     int (*to_thread_alive) (ptid_t ptid);
 372     void (*to_find_new_threads) (void);
 373     char *(*to_pid_to_str) (ptid_t);
 374     char *(*to_extra_thread_info) (struct thread_info *);
 375     void (*to_stop) (void);
 376     void (*to_rcmd) (char *command, struct ui_file *output);
 377     struct symtab_and_line *(*to_enable_exception_callback) (enum
 378                                                              exception_event_kind,
 379                                                              int);
 380     struct exception_event_record *(*to_get_current_exception_event) (void);
 381     char *(*to_pid_to_exec_file) (int pid);
 382     enum strata to_stratum;
 383     int to_has_all_memory;
 384     int to_has_memory;
 385     int to_has_stack;
 386     int to_has_registers;
 387     int to_has_execution;
 388     int to_has_thread_control;  /* control thread execution */
 389     struct section_table
 390      *to_sections;
 391     struct section_table
 392      *to_sections_end;
 393     /* ASYNC target controls */
 394     int (*to_can_async_p) (void);
 395     int (*to_is_async_p) (void);
 396     void (*to_async) (void (*cb) (enum inferior_event_type, void *context),
 397                       void *context);
 398     int to_async_mask_value;
 399     int (*to_find_memory_regions) (int (*) (CORE_ADDR,
 400                                             unsigned long,
 401                                             int, int, int,
 402                                             void *),
 403                                    void *);
 404     char * (*to_make_corefile_notes) (bfd *, int *);
 405
 406     /* Return the thread-local address at OFFSET in the
 407        thread-local storage for the thread PTID and the shared library
 408        or executable file given by OBJFILE.  If that block of
 409        thread-local storage hasn't been allocated yet, this function
 410        may return an error.  */
 411     CORE_ADDR (*to_get_thread_local_address) (ptid_t ptid,
 412                                               struct objfile *objfile,
 413                                               CORE_ADDR offset);
 414
 415     /* Perform partial transfers on OBJECT.  See target_read_partial
 416        and target_write_partial for details of each variant.  One, and
 417        only one, of readbuf or writebuf must be non-NULL.  */
 418     LONGEST (*to_xfer_partial) (struct target_ops *ops,
 419                                 enum target_object object, const char *annex,
 420                                 void *readbuf, const void *writebuf,
 421                                 ULONGEST offset, LONGEST len);
 422
 423     int to_magic;
 424     /* Need sub-structure for target machine related rather than comm related?
 425      */
 426   };
 427
 428 /* Magic number for checking ops size.  If a struct doesn't end with this
 429    number, somebody changed the declaration but didn't change all the
 430    places that initialize one.  */
 431
 432 #define OPS_MAGIC       3840
 433
 434 /* The ops structure for our "current" target process.  This should
 435    never be NULL.  If there is no target, it points to the dummy_target.  */
 436
 437 extern struct target_ops current_target;
 438
 439 /* Define easy words for doing these operations on our current target.  */
 440
 441 #define target_shortname        (current_target.to_shortname)
 442 #define target_longname         (current_target.to_longname)
 443
 444 /* Does whatever cleanup is required for a target that we are no
 445    longer going to be calling.  QUITTING indicates that GDB is exiting
 446    and should not get hung on an error (otherwise it is important to
 447    perform clean termination, even if it takes a while).  This routine
 448    is automatically always called when popping the target off the
 449    target stack (to_beneath is undefined).  Closing file descriptors
 450    and freeing all memory allocated memory are typical things it
 451    should do.  */
 452
 453 void target_close (struct target_ops *targ, int quitting);
 454
 455 /* Attaches to a process on the target side.  Arguments are as passed
 456    to the `attach' command by the user.  This routine can be called
 457    when the target is not on the target-stack, if the target_can_run
 458    routine returns 1; in that case, it must push itself onto the stack.
 459    Upon exit, the target should be ready for normal operations, and
 460    should be ready to deliver the status of the process immediately
 461    (without waiting) to an upcoming target_wait call.  */
 462
 463 #define target_attach(args, from_tty)   \
 464      (*current_target.to_attach) (args, from_tty)
 465
 466 /* The target_attach operation places a process under debugger control,
 467    and stops the process.
 468
 469    This operation provides a target-specific hook that allows the
 470    necessary bookkeeping to be performed after an attach completes.  */
 471 #define target_post_attach(pid) \
 472      (*current_target.to_post_attach) (pid)
 473
 474 /* Takes a program previously attached to and detaches it.
 475    The program may resume execution (some targets do, some don't) and will
 476    no longer stop on signals, etc.  We better not have left any breakpoints
 477    in the program or it'll die when it hits one.  ARGS is arguments
 478    typed by the user (e.g. a signal to send the process).  FROM_TTY
 479    says whether to be verbose or not.  */
 480
 481 extern void target_detach (char *, int);
 482
 483 /* Disconnect from the current target without resuming it (leaving it
 484    waiting for a debugger).  */
 485
 486 extern void target_disconnect (char *, int);
 487
 488 /* Resume execution of the target process PTID.  STEP says whether to
 489    single-step or to run free; SIGGNAL is the signal to be given to
 490    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 491    pass TARGET_SIGNAL_DEFAULT.  */
 492
 493 #define target_resume(ptid, step, siggnal)                              \
 494   do {                                                                  \
 495     dcache_invalidate(target_dcache);                                   \
 496     (*current_target.to_resume) (ptid, step, siggnal);                  \
 497   } while (0)
 498
 499 /* Wait for process pid to do something.  PTID = -1 to wait for any
 500    pid to do something.  Return pid of child, or -1 in case of error;
 501    store status through argument pointer STATUS.  Note that it is
 502    _NOT_ OK to throw_exception() out of target_wait() without popping
 503    the debugging target from the stack; GDB isn't prepared to get back
 504    to the prompt with a debugging target but without the frame cache,
 505    stop_pc, etc., set up.  */
 506
 507 #define target_wait(ptid, status)               \
 508      (*current_target.to_wait) (ptid, status)
 509
 510 /* The target_wait operation waits for a process event to occur, and
 511    thereby stop the process.
 512
 513    On some targets, certain events may happen in sequences.  gdb's
 514    correct response to any single event of such a sequence may require
 515    knowledge of what earlier events in the sequence have been seen.
 516
 517    This operation provides a target-specific hook that allows the
 518    necessary bookkeeping to be performed to track such sequences.  */
 519
 520 #define target_post_wait(ptid, status) \
 521      (*current_target.to_post_wait) (ptid, status)
 522
 523 /* Fetch at least register REGNO, or all regs if regno == -1.  No result.  */
 524
 525 #define target_fetch_registers(regno)   \
 526      (*current_target.to_fetch_registers) (regno)
 527
 528 /* Store at least register REGNO, or all regs if REGNO == -1.
 529    It can store as many registers as it wants to, so target_prepare_to_store
 530    must have been previously called.  Calls error() if there are problems.  */
 531
 532 #define target_store_registers(regs)    \
 533      (*current_target.to_store_registers) (regs)
 534
 535 /* Get ready to modify the registers array.  On machines which store
 536    individual registers, this doesn't need to do anything.  On machines
 537    which store all the registers in one fell swoop, this makes sure
 538    that REGISTERS contains all the registers from the program being
 539    debugged.  */
 540
 541 #define target_prepare_to_store()       \
 542      (*current_target.to_prepare_to_store) ()
 543
 544 extern DCACHE *target_dcache;
 545
 546 extern int do_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
 547                            struct mem_attrib *attrib);
 548
 549 extern int target_read_string (CORE_ADDR, char **, int, int *);
 550
 551 extern int target_read_memory (CORE_ADDR memaddr, char *myaddr, int len);
 552
 553 extern int target_write_memory (CORE_ADDR memaddr, char *myaddr, int len);
 554
 555 extern int xfer_memory (CORE_ADDR, char *, int, int,
 556                         struct mem_attrib *, struct target_ops *);
 557
 558 extern int child_xfer_memory (CORE_ADDR, char *, int, int,
 559                               struct mem_attrib *, struct target_ops *);
 560
 561 /* Make a single attempt at transfering LEN bytes.  On a successful
 562    transfer, the number of bytes actually transfered is returned and
 563    ERR is set to 0.  When a transfer fails, -1 is returned (the number
 564    of bytes actually transfered is not defined) and ERR is set to a
 565    non-zero error indication.  */
 566
 567 extern int target_read_memory_partial (CORE_ADDR addr, char *buf, int len,
 568                                        int *err);
 569
 570 extern int target_write_memory_partial (CORE_ADDR addr, char *buf, int len,
 571                                         int *err);
 572
 573 extern char *child_pid_to_exec_file (int);
 574
 575 extern char *child_core_file_to_sym_file (char *);
 576
 577 #if defined(CHILD_POST_ATTACH)
 578 extern void child_post_attach (int);
 579 #endif
 580
 581 extern void child_post_wait (ptid_t, int);
 582
 583 extern void child_post_startup_inferior (ptid_t);
 584
 585 extern void child_acknowledge_created_inferior (int);
 586
 587 extern int child_insert_fork_catchpoint (int);
 588
 589 extern int child_remove_fork_catchpoint (int);
 590
 591 extern int child_insert_vfork_catchpoint (int);
 592
 593 extern int child_remove_vfork_catchpoint (int);
 594
 595 extern void child_acknowledge_created_inferior (int);
 596
 597 extern int child_follow_fork (int);
 598
 599 extern int child_insert_exec_catchpoint (int);
 600
 601 extern int child_remove_exec_catchpoint (int);
 602
 603 extern int child_reported_exec_events_per_exec_call (void);
 604
 605 extern int child_has_exited (int, int, int *);
 606
 607 extern int child_thread_alive (ptid_t);
 608
 609 /* From infrun.c.  */
 610
 611 extern int inferior_has_forked (int pid, int *child_pid);
 612
 613 extern int inferior_has_vforked (int pid, int *child_pid);
 614
 615 extern int inferior_has_execd (int pid, char **execd_pathname);
 616
 617 /* From exec.c */
 618
 619 extern void print_section_info (struct target_ops *, bfd *);
 620
 621 /* Print a line about the current target.  */
 622
 623 #define target_files_info()     \
 624      (*current_target.to_files_info) (&current_target)
 625
 626 /* Insert a breakpoint at address ADDR in the target machine.  SAVE is
 627    a pointer to memory allocated for saving the target contents.  It
 628    is guaranteed by the caller to be long enough to save the number of
 629    breakpoint bytes indicated by BREAKPOINT_FROM_PC.  Result is 0 for
 630    success, or an errno value.  */
 631
 632 #define target_insert_breakpoint(addr, save)    \
 633      (*current_target.to_insert_breakpoint) (addr, save)
 634
 635 /* Remove a breakpoint at address ADDR in the target machine.
 636    SAVE is a pointer to the same save area
 637    that was previously passed to target_insert_breakpoint.
 638    Result is 0 for success, or an errno value.  */
 639
 640 #define target_remove_breakpoint(addr, save)    \
 641      (*current_target.to_remove_breakpoint) (addr, save)
 642
 643 /* Initialize the terminal settings we record for the inferior,
 644    before we actually run the inferior.  */
 645
 646 #define target_terminal_init() \
 647      (*current_target.to_terminal_init) ()
 648
 649 /* Put the inferior's terminal settings into effect.
 650    This is preparation for starting or resuming the inferior.  */
 651
 652 #define target_terminal_inferior() \
 653      (*current_target.to_terminal_inferior) ()
 654
 655 /* Put some of our terminal settings into effect,
 656    enough to get proper results from our output,
 657    but do not change into or out of RAW mode
 658    so that no input is discarded.
 659
 660    After doing this, either terminal_ours or terminal_inferior
 661    should be called to get back to a normal state of affairs.  */
 662
 663 #define target_terminal_ours_for_output() \
 664      (*current_target.to_terminal_ours_for_output) ()
 665
 666 /* Put our terminal settings into effect.
 667    First record the inferior's terminal settings
 668    so they can be restored properly later.  */
 669
 670 #define target_terminal_ours() \
 671      (*current_target.to_terminal_ours) ()
 672
 673 /* Save our terminal settings.
 674    This is called from TUI after entering or leaving the curses
 675    mode.  Since curses modifies our terminal this call is here
 676    to take this change into account.  */
 677
 678 #define target_terminal_save_ours() \
 679      (*current_target.to_terminal_save_ours) ()
 680
 681 /* Print useful information about our terminal status, if such a thing
 682    exists.  */
 683
 684 #define target_terminal_info(arg, from_tty) \
 685      (*current_target.to_terminal_info) (arg, from_tty)
 686
 687 /* Kill the inferior process.   Make it go away.  */
 688
 689 #define target_kill() \
 690      (*current_target.to_kill) ()
 691
 692 /* Load an executable file into the target process.  This is expected
 693    to not only bring new code into the target process, but also to
 694    update GDB's symbol tables to match.  */
 695
 696 extern void target_load (char *arg, int from_tty);
 697
 698 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 699    name.  ADDRP is a CORE_ADDR * pointing to where the value of the
 700    symbol should be returned.  The result is 0 if successful, nonzero
 701    if the symbol does not exist in the target environment.  This
 702    function should not call error() if communication with the target
 703    is interrupted, since it is called from symbol reading, but should
 704    return nonzero, possibly doing a complain().  */
 705
 706 #define target_lookup_symbol(name, addrp) \
 707      (*current_target.to_lookup_symbol) (name, addrp)
 708
 709 /* Start an inferior process and set inferior_ptid to its pid.
 710    EXEC_FILE is the file to run.
 711    ALLARGS is a string containing the arguments to the program.
 712    ENV is the environment vector to pass.  Errors reported with error().
 713    On VxWorks and various standalone systems, we ignore exec_file.  */
 714
 715 #define target_create_inferior(exec_file, args, env)    \
 716      (*current_target.to_create_inferior) (exec_file, args, env)
 717
 718
 719 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 720    notification of inferior events such as fork and vork immediately
 721    after the inferior is created.  (This because of how gdb gets an
 722    inferior created via invoking a shell to do it.  In such a scenario,
 723    if the shell init file has commands in it, the shell will fork and
 724    exec for each of those commands, and we will see each such fork
 725    event.  Very bad.)
 726
 727    Such targets will supply an appropriate definition for this function.  */
 728
 729 #define target_post_startup_inferior(ptid) \
 730      (*current_target.to_post_startup_inferior) (ptid)
 731
 732 /* On some targets, the sequence of starting up an inferior requires
 733    some synchronization between gdb and the new inferior process, PID.  */
 734
 735 #define target_acknowledge_created_inferior(pid) \
 736      (*current_target.to_acknowledge_created_inferior) (pid)
 737
 738 /* On some targets, we can catch an inferior fork or vfork event when
 739    it occurs.  These functions insert/remove an already-created
 740    catchpoint for such events.  */
 741
 742 #define target_insert_fork_catchpoint(pid) \
 743      (*current_target.to_insert_fork_catchpoint) (pid)
 744
 745 #define target_remove_fork_catchpoint(pid) \
 746      (*current_target.to_remove_fork_catchpoint) (pid)
 747
 748 #define target_insert_vfork_catchpoint(pid) \
 749      (*current_target.to_insert_vfork_catchpoint) (pid)
 750
 751 #define target_remove_vfork_catchpoint(pid) \
 752      (*current_target.to_remove_vfork_catchpoint) (pid)
 753
 754 /* If the inferior forks or vforks, this function will be called at
 755    the next resume in order to perform any bookkeeping and fiddling
 756    necessary to continue debugging either the parent or child, as
 757    requested, and releasing the other.  Information about the fork
 758    or vfork event is available via get_last_target_status ().
 759    This function returns 1 if the inferior should not be resumed
 760    (i.e. there is another event pending).  */
 761
 762 #define target_follow_fork(follow_child) \
 763      (*current_target.to_follow_fork) (follow_child)
 764
 765 /* On some targets, we can catch an inferior exec event when it
 766    occurs.  These functions insert/remove an already-created
 767    catchpoint for such events.  */
 768
 769 #define target_insert_exec_catchpoint(pid) \
 770      (*current_target.to_insert_exec_catchpoint) (pid)
 771
 772 #define target_remove_exec_catchpoint(pid) \
 773      (*current_target.to_remove_exec_catchpoint) (pid)
 774
 775 /* Returns the number of exec events that are reported when a process
 776    invokes a flavor of the exec() system call on this target, if exec
 777    events are being reported.  */
 778
 779 #define target_reported_exec_events_per_exec_call() \
 780      (*current_target.to_reported_exec_events_per_exec_call) ()
 781
 782 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 783    exit code of PID, if any.  */
 784
 785 #define target_has_exited(pid,wait_status,exit_status) \
 786      (*current_target.to_has_exited) (pid,wait_status,exit_status)
 787
 788 /* The debugger has completed a blocking wait() call.  There is now
 789    some process event that must be processed.  This function should
 790    be defined by those targets that require the debugger to perform
 791    cleanup or internal state changes in response to the process event.  */
 792
 793 /* The inferior process has died.  Do what is right.  */
 794
 795 #define target_mourn_inferior() \
 796      (*current_target.to_mourn_inferior) ()
 797
 798 /* Does target have enough data to do a run or attach command? */
 799
 800 #define target_can_run(t) \
 801      ((t)->to_can_run) ()
 802
 803 /* post process changes to signal handling in the inferior.  */
 804
 805 #define target_notice_signals(ptid) \
 806      (*current_target.to_notice_signals) (ptid)
 807
 808 /* Check to see if a thread is still alive.  */
 809
 810 #define target_thread_alive(ptid) \
 811      (*current_target.to_thread_alive) (ptid)
 812
 813 /* Query for new threads and add them to the thread list.  */
 814
 815 #define target_find_new_threads() \
 816      (*current_target.to_find_new_threads) (); \
 817
 818 /* Make target stop in a continuable fashion.  (For instance, under
 819    Unix, this should act like SIGSTOP).  This function is normally
 820    used by GUIs to implement a stop button.  */
 821
 822 #define target_stop current_target.to_stop
 823
 824 /* Send the specified COMMAND to the target's monitor
 825    (shell,interpreter) for execution.  The result of the query is
 826    placed in OUTBUF.  */
 827
 828 #define target_rcmd(command, outbuf) \
 829      (*current_target.to_rcmd) (command, outbuf)
 830
 831
 832 /* Get the symbol information for a breakpointable routine called when
 833    an exception event occurs.
 834    Intended mainly for C++, and for those
 835    platforms/implementations where such a callback mechanism is available,
 836    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 837    different mechanisms for debugging exceptions.  */
 838
 839 #define target_enable_exception_callback(kind, enable) \
 840      (*current_target.to_enable_exception_callback) (kind, enable)
 841
 842 /* Get the current exception event kind -- throw or catch, etc.  */
 843
 844 #define target_get_current_exception_event() \
 845      (*current_target.to_get_current_exception_event) ()
 846
 847 /* Does the target include all of memory, or only part of it?  This
 848    determines whether we look up the target chain for other parts of
 849    memory if this target can't satisfy a request.  */
 850
 851 #define target_has_all_memory   \
 852      (current_target.to_has_all_memory)
 853
 854 /* Does the target include memory?  (Dummy targets don't.)  */
 855
 856 #define target_has_memory       \
 857      (current_target.to_has_memory)
 858
 859 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 860    we start a process.)  */
 861
 862 #define target_has_stack        \
 863      (current_target.to_has_stack)
 864
 865 /* Does the target have registers?  (Exec files don't.)  */
 866
 867 #define target_has_registers    \
 868      (current_target.to_has_registers)
 869
 870 /* Does the target have execution?  Can we make it jump (through
 871    hoops), or pop its stack a few times?  FIXME: If this is to work that
 872    way, it needs to check whether an inferior actually exists.
 873    remote-udi.c and probably other targets can be the current target
 874    when the inferior doesn't actually exist at the moment.  Right now
 875    this just tells us whether this target is *capable* of execution.  */
 876
 877 #define target_has_execution    \
 878      (current_target.to_has_execution)
 879
 880 /* Can the target support the debugger control of thread execution?
 881    a) Can it lock the thread scheduler?
 882    b) Can it switch the currently running thread?  */
 883
 884 #define target_can_lock_scheduler \
 885      (current_target.to_has_thread_control & tc_schedlock)
 886
 887 #define target_can_switch_threads \
 888      (current_target.to_has_thread_control & tc_switch)
 889
 890 /* Can the target support asynchronous execution? */
 891 #define target_can_async_p() (current_target.to_can_async_p ())
 892
 893 /* Is the target in asynchronous execution mode? */
 894 #define target_is_async_p() (current_target.to_is_async_p())
 895
 896 /* Put the target in async mode with the specified callback function. */
 897 #define target_async(CALLBACK,CONTEXT) \
 898      (current_target.to_async((CALLBACK), (CONTEXT)))
 899
 900 /* This is to be used ONLY within call_function_by_hand(). It provides
 901    a workaround, to have inferior function calls done in sychronous
 902    mode, even though the target is asynchronous. After
 903    target_async_mask(0) is called, calls to target_can_async_p() will
 904    return FALSE , so that target_resume() will not try to start the
 905    target asynchronously. After the inferior stops, we IMMEDIATELY
 906    restore the previous nature of the target, by calling
 907    target_async_mask(1). After that, target_can_async_p() will return
 908    TRUE. ANY OTHER USE OF THIS FEATURE IS DEPRECATED.
 909
 910    FIXME ezannoni 1999-12-13: we won't need this once we move
 911    the turning async on and off to the single execution commands,
 912    from where it is done currently, in remote_resume().  */
 913
 914 #define target_async_mask_value \
 915      (current_target.to_async_mask_value)
 916
 917 extern int target_async_mask (int mask);
 918
 919 extern void target_link (char *, CORE_ADDR *);
 920
 921 /* Converts a process id to a string.  Usually, the string just contains
 922    `process xyz', but on some systems it may contain
 923    `process xyz thread abc'.  */
 924
 925 #undef target_pid_to_str
 926 #define target_pid_to_str(PID) current_target.to_pid_to_str (PID)
 927
 928 #ifndef target_tid_to_str
 929 #define target_tid_to_str(PID) \
 930      target_pid_to_str (PID)
 931 extern char *normal_pid_to_str (ptid_t ptid);
 932 #endif
 933
 934 /* Return a short string describing extra information about PID,
 935    e.g. "sleeping", "runnable", "running on LWP 3".  Null return value
 936    is okay.  */
 937
 938 #define target_extra_thread_info(TP) \
 939      (current_target.to_extra_thread_info (TP))
 940
 941 /*
 942  * New Objfile Event Hook:
 943  *
 944  * Sometimes a GDB component wants to get notified whenever a new
 945  * objfile is loaded.  Mainly this is used by thread-debugging
 946  * implementations that need to know when symbols for the target
 947  * thread implemenation are available.
 948  *
 949  * The old way of doing this is to define a macro 'target_new_objfile'
 950  * that points to the function that you want to be called on every
 951  * objfile/shlib load.
 952
 953    The new way is to grab the function pointer,
 954    'deprecated_target_new_objfile_hook', and point it to the function
 955    that you want to be called on every objfile/shlib load.
 956
 957    If multiple clients are willing to be cooperative, they can each
 958    save a pointer to the previous value of
 959    deprecated_target_new_objfile_hook before modifying it, and arrange
 960    for their function to call the previous function in the chain.  In
 961    that way, multiple clients can receive this notification (something
 962    like with signal handlers).  */
 963
 964 extern void (*deprecated_target_new_objfile_hook) (struct objfile *);
 965
 966 #ifndef target_pid_or_tid_to_str
 967 #define target_pid_or_tid_to_str(ID) \
 968      target_pid_to_str (ID)
 969 #endif
 970
 971 /* Attempts to find the pathname of the executable file
 972    that was run to create a specified process.
 973
 974    The process PID must be stopped when this operation is used.
 975
 976    If the executable file cannot be determined, NULL is returned.
 977
 978    Else, a pointer to a character string containing the pathname
 979    is returned.  This string should be copied into a buffer by
 980    the client if the string will not be immediately used, or if
 981    it must persist.  */
 982
 983 #define target_pid_to_exec_file(pid) \
 984      (current_target.to_pid_to_exec_file) (pid)
 985
 986 /*
 987  * Iterator function for target memory regions.
 988  * Calls a callback function once for each memory region 'mapped'
 989  * in the child process.  Defined as a simple macro rather than
 990  * as a function macro so that it can be tested for nullity.
 991  */
 992
 993 #define target_find_memory_regions(FUNC, DATA) \
 994      (current_target.to_find_memory_regions) (FUNC, DATA)
 995
 996 /*
 997  * Compose corefile .note section.
 998  */
 999
1000 #define target_make_corefile_notes(BFD, SIZE_P) \
1001      (current_target.to_make_corefile_notes) (BFD, SIZE_P)
1002
1003 /* Thread-local values.  */
1004 #define target_get_thread_local_address \
1005     (current_target.to_get_thread_local_address)
1006 #define target_get_thread_local_address_p() \
1007     (target_get_thread_local_address != NULL)
1008
1009 /* Hook to call target dependent code just after inferior target process has
1010    started.  */
1011
1012 #ifndef TARGET_CREATE_INFERIOR_HOOK
1013 #define TARGET_CREATE_INFERIOR_HOOK(PID)
1014 #endif
1015
1016 /* Hardware watchpoint interfaces.  */
1017
1018 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1019    write).  */
1020
1021 #ifndef STOPPED_BY_WATCHPOINT
1022 #define STOPPED_BY_WATCHPOINT(w) \
1023    (*current_target.to_stopped_by_watchpoint) ()
1024 #endif
1025
1026 /* Non-zero if we have continuable watchpoints  */
1027
1028 #ifndef HAVE_CONTINUABLE_WATCHPOINT
1029 #define HAVE_CONTINUABLE_WATCHPOINT \
1030    (current_target.to_have_continuable_watchpoint)
1031 #endif
1032
1033 /* HP-UX supplies these operations, which respectively disable and enable
1034    the memory page-protections that are used to implement hardware watchpoints
1035    on that platform.  See wait_for_inferior's use of these.  */
1036
1037 #if !defined(TARGET_DISABLE_HW_WATCHPOINTS)
1038 #define TARGET_DISABLE_HW_WATCHPOINTS(pid)
1039 #endif
1040
1041 #if !defined(TARGET_ENABLE_HW_WATCHPOINTS)
1042 #define TARGET_ENABLE_HW_WATCHPOINTS(pid)
1043 #endif
1044
1045 /* Provide defaults for hardware watchpoint functions.  */
1046
1047 /* If the *_hw_beakpoint functions have not been defined
1048    elsewhere use the definitions in the target vector.  */
1049
1050 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1051    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1052    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1053    (including this one?).  OTHERTYPE is who knows what...  */
1054
1055 #ifndef TARGET_CAN_USE_HARDWARE_WATCHPOINT
1056 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) \
1057  (*current_target.to_can_use_hw_breakpoint) (TYPE, CNT, OTHERTYPE);
1058 #endif
1059
1060 #if !defined(TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT)
1061 #define TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT(byte_count) \
1062     (*current_target.to_region_size_ok_for_hw_watchpoint) (byte_count)
1063 #endif
1064
1065
1066 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1067    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1068    success, non-zero for failure.  */
1069
1070 #ifndef target_insert_watchpoint
1071 #define target_insert_watchpoint(addr, len, type)       \
1072      (*current_target.to_insert_watchpoint) (addr, len, type)
1073
1074 #define target_remove_watchpoint(addr, len, type)       \
1075      (*current_target.to_remove_watchpoint) (addr, len, type)
1076 #endif
1077
1078 #ifndef target_insert_hw_breakpoint
1079 #define target_insert_hw_breakpoint(addr, save) \
1080      (*current_target.to_insert_hw_breakpoint) (addr, save)
1081
1082 #define target_remove_hw_breakpoint(addr, save) \
1083      (*current_target.to_remove_hw_breakpoint) (addr, save)
1084 #endif
1085
1086 #ifndef target_stopped_data_address
1087 #define target_stopped_data_address() \
1088     (*current_target.to_stopped_data_address) ()
1089 #endif
1090
1091 /* Sometimes gdb may pick up what appears to be a valid target address
1092    from a minimal symbol, but the value really means, essentially,
1093    "This is an index into a table which is populated when the inferior
1094    is run.  Therefore, do not attempt to use this as a PC."  */
1095
1096 #if !defined(PC_REQUIRES_RUN_BEFORE_USE)
1097 #define PC_REQUIRES_RUN_BEFORE_USE(pc) (0)
1098 #endif
1099
1100 /* This will only be defined by a target that supports catching vfork events,
1101    such as HP-UX.
1102
1103    On some targets (such as HP-UX 10.20 and earlier), resuming a newly vforked
1104    child process after it has exec'd, causes the parent process to resume as
1105    well.  To prevent the parent from running spontaneously, such targets should
1106    define this to a function that prevents that from happening.  */
1107 #if !defined(ENSURE_VFORKING_PARENT_REMAINS_STOPPED)
1108 #define ENSURE_VFORKING_PARENT_REMAINS_STOPPED(PID) (0)
1109 #endif
1110
1111 /* This will only be defined by a target that supports catching vfork events,
1112    such as HP-UX.
1113
1114    On some targets (such as HP-UX 10.20 and earlier), a newly vforked child
1115    process must be resumed when it delivers its exec event, before the parent
1116    vfork event will be delivered to us.  */
1117
1118 #if !defined(RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK)
1119 #define RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK() (0)
1120 #endif
1121
1122 /* Routines for maintenance of the target structures...
1123
1124    add_target:   Add a target to the list of all possible targets.
1125
1126    push_target:  Make this target the top of the stack of currently used
1127    targets, within its particular stratum of the stack.  Result
1128    is 0 if now atop the stack, nonzero if not on top (maybe
1129    should warn user).
1130
1131    unpush_target: Remove this from the stack of currently used targets,
1132    no matter where it is on the list.  Returns 0 if no
1133    change, 1 if removed from stack.
1134
1135    pop_target:   Remove the top thing on the stack of current targets.  */
1136
1137 extern void add_target (struct target_ops *);
1138
1139 extern int push_target (struct target_ops *);
1140
1141 extern int unpush_target (struct target_ops *);
1142
1143 extern void target_preopen (int);
1144
1145 extern void pop_target (void);
1146
1147 /* Struct section_table maps address ranges to file sections.  It is
1148    mostly used with BFD files, but can be used without (e.g. for handling
1149    raw disks, or files not in formats handled by BFD).  */
1150
1151 struct section_table
1152   {
1153     CORE_ADDR addr;             /* Lowest address in section */
1154     CORE_ADDR endaddr;          /* 1+highest address in section */
1155
1156     struct bfd_section *the_bfd_section;
1157
1158     bfd *bfd;                   /* BFD file pointer */
1159   };
1160
1161 /* Return the "section" containing the specified address.  */
1162 struct section_table *target_section_by_addr (struct target_ops *target,
1163                                               CORE_ADDR addr);
1164
1165
1166 /* From mem-break.c */
1167
1168 extern int memory_remove_breakpoint (CORE_ADDR, char *);
1169
1170 extern int memory_insert_breakpoint (CORE_ADDR, char *);
1171
1172 extern int default_memory_remove_breakpoint (CORE_ADDR, char *);
1173
1174 extern int default_memory_insert_breakpoint (CORE_ADDR, char *);
1175
1176
1177 /* From target.c */
1178
1179 extern void initialize_targets (void);
1180
1181 extern void noprocess (void);
1182
1183 extern void find_default_attach (char *, int);
1184
1185 extern void find_default_create_inferior (char *, char *, char **);
1186
1187 extern struct target_ops *find_run_target (void);
1188
1189 extern struct target_ops *find_core_target (void);
1190
1191 extern struct target_ops *find_target_beneath (struct target_ops *);
1192
1193 extern int target_resize_to_sections (struct target_ops *target,
1194                                       int num_added);
1195
1196 extern void remove_target_sections (bfd *abfd);
1197
1198 \f
1199 /* Stuff that should be shared among the various remote targets.  */
1200
1201 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1202    information (higher values, more information).  */
1203 extern int remote_debug;
1204
1205 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1206 extern int baud_rate;
1207 /* Timeout limit for response from target. */
1208 extern int remote_timeout;
1209
1210 \f
1211 /* Functions for helping to write a native target.  */
1212
1213 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1214 extern void store_waitstatus (struct target_waitstatus *, int);
1215
1216 /* Predicate to target_signal_to_host(). Return non-zero if the enum
1217    targ_signal SIGNO has an equivalent ``host'' representation.  */
1218 /* FIXME: cagney/1999-11-22: The name below was chosen in preference
1219    to the shorter target_signal_p() because it is far less ambigious.
1220    In this context ``target_signal'' refers to GDB's internal
1221    representation of the target's set of signals while ``host signal''
1222    refers to the target operating system's signal.  Confused?  */
1223
1224 extern int target_signal_to_host_p (enum target_signal signo);
1225
1226 /* Convert between host signal numbers and enum target_signal's.
1227    target_signal_to_host() returns 0 and prints a warning() on GDB's
1228    console if SIGNO has no equivalent host representation.  */
1229 /* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
1230    refering to the target operating system's signal numbering.
1231    Similarly, ``enum target_signal'' is named incorrectly, ``enum
1232    gdb_signal'' would probably be better as it is refering to GDB's
1233    internal representation of a target operating system's signal.  */
1234
1235 extern enum target_signal target_signal_from_host (int);
1236 extern int target_signal_to_host (enum target_signal);
1237
1238 /* Convert from a number used in a GDB command to an enum target_signal.  */
1239 extern enum target_signal target_signal_from_command (int);
1240
1241 /* Any target can call this to switch to remote protocol (in remote.c). */
1242 extern void push_remote_target (char *name, int from_tty);
1243 \f
1244 /* Imported from machine dependent code */
1245
1246 /* Blank target vector entries are initialized to target_ignore. */
1247 void target_ignore (void);
1248
1249 #endif /* !defined (TARGET_H) */