gdb/target.h

   1 /* Interface between GDB and target environments, including files and processes
   2    Copyright 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
   3    Contributed by Cygnus Support.  Written by John Gilmore.
   4
   5 This file is part of GDB.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #if !defined (TARGET_H)
  22 #define TARGET_H
  23
  24 /* This include file defines the interface between the main part
  25    of the debugger, and the part which is target-specific, or
  26    specific to the communications interface between us and the
  27    target.
  28
  29    A TARGET is an interface between the debugger and a particular
  30    kind of file or process.  Targets can be STACKED in STRATA,
  31    so that more than one target can potentially respond to a request.
  32    In particular, memory accesses will walk down the stack of targets
  33    until they find a target that is interested in handling that particular
  34    address.  STRATA are artificial boundaries on the stack, within
  35    which particular kinds of targets live.  Strata exist so that
  36    people don't get confused by pushing e.g. a process target and then
  37    a file target, and wondering why they can't see the current values
  38    of variables any more (the file target is handling them and they
  39    never get to the process target).  So when you push a file target,
  40    it goes into the file stratum, which is always below the process
  41    stratum.  */
  42
  43 #include "bfd.h"
  44 #include "symtab.h"
  45
  46 enum strata {
  47         dummy_stratum,          /* The lowest of the low */
  48         file_stratum,           /* Executable files, etc */
  49         core_stratum,           /* Core dump files */
  50         download_stratum,       /* Downloading of remote targets */
  51         process_stratum         /* Executing processes */
  52 };
  53
  54 enum thread_control_capabilities {
  55         tc_none = 0,            /* Default: can't control thread execution. */
  56         tc_schedlock = 1,       /* Can lock the thread scheduler. */
  57         tc_switch = 2,          /* Can switch the running thread on demand. */
  58 };
  59
  60 /* Stuff for target_wait.  */
  61
  62 /* Generally, what has the program done?  */
  63 enum target_waitkind {
  64   /* The program has exited.  The exit status is in value.integer.  */
  65   TARGET_WAITKIND_EXITED,
  66
  67   /* The program has stopped with a signal.  Which signal is in value.sig.  */
  68   TARGET_WAITKIND_STOPPED,
  69
  70   /* The program has terminated with a signal.  Which signal is in
  71      value.sig.  */
  72   TARGET_WAITKIND_SIGNALLED,
  73
  74   /* The program is letting us know that it dynamically loaded something
  75      (e.g. it called load(2) on AIX).  */
  76   TARGET_WAITKIND_LOADED,
  77
  78   /* The program has forked.  A "related" process' ID is in value.related_pid.
  79      I.e., if the child forks, value.related_pid is the parent's ID.
  80      */
  81   TARGET_WAITKIND_FORKED,
  82
  83   /* The program has vforked.  A "related" process's ID is in value.related_pid.
  84      */
  85   TARGET_WAITKIND_VFORKED,
  86
  87   /* The program has exec'ed a new executable file.  The new file's pathname
  88      is pointed to by value.execd_pathname.
  89      */
  90   TARGET_WAITKIND_EXECD,
  91
  92   /* The program has entered or returned from a system call.  On HP-UX, this
  93      is used in the hardware watchpoint implementation.  The syscall's unique
  94      integer ID number is in value.syscall_id;
  95      */
  96   TARGET_WAITKIND_SYSCALL_ENTRY,
  97   TARGET_WAITKIND_SYSCALL_RETURN,
  98
  99   /* Nothing happened, but we stopped anyway.  This perhaps should be handled
 100      within target_wait, but I'm not sure target_wait should be resuming the
 101      inferior.  */
 102   TARGET_WAITKIND_SPURIOUS
 103   };
 104
 105 /* The numbering of these signals is chosen to match traditional unix
 106    signals (insofar as various unices use the same numbers, anyway).
 107    It is also the numbering of the GDB remote protocol.  Other remote
 108    protocols, if they use a different numbering, should make sure to
 109    translate appropriately.  */
 110
 111 /* This is based strongly on Unix/POSIX signals for several reasons:
 112    (1) This set of signals represents a widely-accepted attempt to
 113    represent events of this sort in a portable fashion, (2) we want a
 114    signal to make it from wait to child_wait to the user intact, (3) many
 115    remote protocols use a similar encoding.  However, it is
 116    recognized that this set of signals has limitations (such as not
 117    distinguishing between various kinds of SIGSEGV, or not
 118    distinguishing hitting a breakpoint from finishing a single step).
 119    So in the future we may get around this either by adding additional
 120    signals for breakpoint, single-step, etc., or by adding signal
 121    codes; the latter seems more in the spirit of what BSD, System V,
 122    etc. are doing to address these issues.  */
 123
 124 /* For an explanation of what each signal means, see
 125    target_signal_to_string.  */
 126
 127 enum target_signal {
 128   /* Used some places (e.g. stop_signal) to record the concept that
 129      there is no signal.  */
 130   TARGET_SIGNAL_0 = 0,
 131   TARGET_SIGNAL_FIRST = 0,
 132   TARGET_SIGNAL_HUP = 1,
 133   TARGET_SIGNAL_INT = 2,
 134   TARGET_SIGNAL_QUIT = 3,
 135   TARGET_SIGNAL_ILL = 4,
 136   TARGET_SIGNAL_TRAP = 5,
 137   TARGET_SIGNAL_ABRT = 6,
 138   TARGET_SIGNAL_EMT = 7,
 139   TARGET_SIGNAL_FPE = 8,
 140   TARGET_SIGNAL_KILL = 9,
 141   TARGET_SIGNAL_BUS = 10,
 142   TARGET_SIGNAL_SEGV = 11,
 143   TARGET_SIGNAL_SYS = 12,
 144   TARGET_SIGNAL_PIPE = 13,
 145   TARGET_SIGNAL_ALRM = 14,
 146   TARGET_SIGNAL_TERM = 15,
 147   TARGET_SIGNAL_URG = 16,
 148   TARGET_SIGNAL_STOP = 17,
 149   TARGET_SIGNAL_TSTP = 18,
 150   TARGET_SIGNAL_CONT = 19,
 151   TARGET_SIGNAL_CHLD = 20,
 152   TARGET_SIGNAL_TTIN = 21,
 153   TARGET_SIGNAL_TTOU = 22,
 154   TARGET_SIGNAL_IO = 23,
 155   TARGET_SIGNAL_XCPU = 24,
 156   TARGET_SIGNAL_XFSZ = 25,
 157   TARGET_SIGNAL_VTALRM = 26,
 158   TARGET_SIGNAL_PROF = 27,
 159   TARGET_SIGNAL_WINCH = 28,
 160   TARGET_SIGNAL_LOST = 29,
 161   TARGET_SIGNAL_USR1 = 30,
 162   TARGET_SIGNAL_USR2 = 31,
 163   TARGET_SIGNAL_PWR = 32,
 164   /* Similar to SIGIO.  Perhaps they should have the same number.  */
 165   TARGET_SIGNAL_POLL = 33,
 166   TARGET_SIGNAL_WIND = 34,
 167   TARGET_SIGNAL_PHONE = 35,
 168   TARGET_SIGNAL_WAITING = 36,
 169   TARGET_SIGNAL_LWP = 37,
 170   TARGET_SIGNAL_DANGER = 38,
 171   TARGET_SIGNAL_GRANT = 39,
 172   TARGET_SIGNAL_RETRACT = 40,
 173   TARGET_SIGNAL_MSG = 41,
 174   TARGET_SIGNAL_SOUND = 42,
 175   TARGET_SIGNAL_SAK = 43,
 176   TARGET_SIGNAL_PRIO = 44,
 177   TARGET_SIGNAL_REALTIME_33 = 45,
 178   TARGET_SIGNAL_REALTIME_34 = 46,
 179   TARGET_SIGNAL_REALTIME_35 = 47,
 180   TARGET_SIGNAL_REALTIME_36 = 48,
 181   TARGET_SIGNAL_REALTIME_37 = 49,
 182   TARGET_SIGNAL_REALTIME_38 = 50,
 183   TARGET_SIGNAL_REALTIME_39 = 51,
 184   TARGET_SIGNAL_REALTIME_40 = 52,
 185   TARGET_SIGNAL_REALTIME_41 = 53,
 186   TARGET_SIGNAL_REALTIME_42 = 54,
 187   TARGET_SIGNAL_REALTIME_43 = 55,
 188   TARGET_SIGNAL_REALTIME_44 = 56,
 189   TARGET_SIGNAL_REALTIME_45 = 57,
 190   TARGET_SIGNAL_REALTIME_46 = 58,
 191   TARGET_SIGNAL_REALTIME_47 = 59,
 192   TARGET_SIGNAL_REALTIME_48 = 60,
 193   TARGET_SIGNAL_REALTIME_49 = 61,
 194   TARGET_SIGNAL_REALTIME_50 = 62,
 195   TARGET_SIGNAL_REALTIME_51 = 63,
 196   TARGET_SIGNAL_REALTIME_52 = 64,
 197   TARGET_SIGNAL_REALTIME_53 = 65,
 198   TARGET_SIGNAL_REALTIME_54 = 66,
 199   TARGET_SIGNAL_REALTIME_55 = 67,
 200   TARGET_SIGNAL_REALTIME_56 = 68,
 201   TARGET_SIGNAL_REALTIME_57 = 69,
 202   TARGET_SIGNAL_REALTIME_58 = 70,
 203   TARGET_SIGNAL_REALTIME_59 = 71,
 204   TARGET_SIGNAL_REALTIME_60 = 72,
 205   TARGET_SIGNAL_REALTIME_61 = 73,
 206   TARGET_SIGNAL_REALTIME_62 = 74,
 207   TARGET_SIGNAL_REALTIME_63 = 75,
 208 #if defined(MACH) || defined(__MACH__)
 209   /* Mach exceptions */
 210   TARGET_EXC_BAD_ACCESS = 76,
 211   TARGET_EXC_BAD_INSTRUCTION = 77,
 212   TARGET_EXC_ARITHMETIC = 78,
 213   TARGET_EXC_EMULATION = 79,
 214   TARGET_EXC_SOFTWARE = 80,
 215   TARGET_EXC_BREAKPOINT = 81,
 216 #endif
 217   /* Some signal we don't know about.  */
 218   TARGET_SIGNAL_UNKNOWN,
 219
 220   /* Use whatever signal we use when one is not specifically specified
 221      (for passing to proceed and so on).  */
 222   TARGET_SIGNAL_DEFAULT,
 223
 224   /* Last and unused enum value, for sizing arrays, etc.  */
 225   TARGET_SIGNAL_LAST
 226 };
 227
 228 struct target_waitstatus {
 229   enum target_waitkind kind;
 230
 231   /* Forked child pid, execd pathname, exit status or signal number.  */
 232   union {
 233     int integer;
 234     enum target_signal sig;
 235     int  related_pid;
 236     char *  execd_pathname;
 237     int  syscall_id;
 238   } value;
 239 };
 240
 241 /* Return the string for a signal.  */
 242 extern char *target_signal_to_string PARAMS ((enum target_signal));
 243
 244 /* Return the name (SIGHUP, etc.) for a signal.  */
 245 extern char *target_signal_to_name PARAMS ((enum target_signal));
 246
 247 /* Given a name (SIGHUP, etc.), return its signal.  */
 248 enum target_signal target_signal_from_name PARAMS ((char *));
 249
 250 \f
 251 /* If certain kinds of activity happen, target_wait should perform
 252    callbacks.  */
 253 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 254    on TARGET_ACTIVITY_FD.   */
 255 extern int target_activity_fd;
 256 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 257 extern int (*target_activity_function) PARAMS ((void));
 258 \f
 259 struct target_ops
 260 {
 261   char         *to_shortname;   /* Name this target type */
 262   char         *to_longname;    /* Name for printing */
 263   char         *to_doc;         /* Documentation.  Does not include trailing
 264                                    newline, and starts with a one-line descrip-
 265                                    tion (probably similar to to_longname). */
 266   void        (*to_open) PARAMS ((char *, int));
 267   void        (*to_close) PARAMS ((int));
 268   void        (*to_attach) PARAMS ((char *, int));
 269   void        (*to_post_attach) PARAMS ((int));
 270   void        (*to_require_attach) PARAMS ((char *, int));
 271   void        (*to_detach) PARAMS ((char *, int));
 272   void        (*to_require_detach) PARAMS ((int, char *, int));
 273   void        (*to_resume) PARAMS ((int, int, enum target_signal));
 274   int         (*to_wait) PARAMS ((int, struct target_waitstatus *));
 275   void        (*to_post_wait) PARAMS ((int, int));
 276   void        (*to_fetch_registers) PARAMS ((int));
 277   void        (*to_store_registers) PARAMS ((int));
 278   void        (*to_prepare_to_store) PARAMS ((void));
 279
 280   /* Transfer LEN bytes of memory between GDB address MYADDR and
 281      target address MEMADDR.  If WRITE, transfer them to the target, else
 282      transfer them from the target.  TARGET is the target from which we
 283      get this function.
 284
 285      Return value, N, is one of the following:
 286
 287      0 means that we can't handle this.  If errno has been set, it is the
 288      error which prevented us from doing it (FIXME: What about bfd_error?).
 289
 290      positive (call it N) means that we have transferred N bytes
 291      starting at MEMADDR.  We might be able to handle more bytes
 292      beyond this length, but no promises.
 293
 294      negative (call its absolute value N) means that we cannot
 295      transfer right at MEMADDR, but we could transfer at least
 296      something at MEMADDR + N.  */
 297
 298   int         (*to_xfer_memory) PARAMS ((CORE_ADDR memaddr, char *myaddr,
 299                                          int len, int write,
 300                                          struct target_ops * target));
 301
 302 #if 0
 303   /* Enable this after 4.12.  */
 304
 305   /* Search target memory.  Start at STARTADDR and take LEN bytes of
 306      target memory, and them with MASK, and compare to DATA.  If they
 307      match, set *ADDR_FOUND to the address we found it at, store the data
 308      we found at LEN bytes starting at DATA_FOUND, and return.  If
 309      not, add INCREMENT to the search address and keep trying until
 310      the search address is outside of the range [LORANGE,HIRANGE).
 311
 312      If we don't find anything, set *ADDR_FOUND to (CORE_ADDR)0 and return.  */
 313   void (*to_search) PARAMS ((int len, char *data, char *mask,
 314                              CORE_ADDR startaddr, int increment,
 315                              CORE_ADDR lorange, CORE_ADDR hirange,
 316                              CORE_ADDR *addr_found, char *data_found));
 317
 318 #define target_search(len, data, mask, startaddr, increment, lorange, hirange, addr_found, data_found)  \
 319   (*current_target.to_search) (len, data, mask, startaddr, increment, \
 320                                 lorange, hirange, addr_found, data_found)
 321 #endif /* 0 */
 322
 323   void        (*to_files_info) PARAMS ((struct target_ops *));
 324   int         (*to_insert_breakpoint) PARAMS ((CORE_ADDR, char *));
 325   int         (*to_remove_breakpoint) PARAMS ((CORE_ADDR, char *));
 326   void        (*to_terminal_init) PARAMS ((void));
 327   void        (*to_terminal_inferior) PARAMS ((void));
 328   void        (*to_terminal_ours_for_output) PARAMS ((void));
 329   void        (*to_terminal_ours) PARAMS ((void));
 330   void        (*to_terminal_info) PARAMS ((char *, int));
 331   void        (*to_kill) PARAMS ((void));
 332   void        (*to_load) PARAMS ((char *, int));
 333   int         (*to_lookup_symbol) PARAMS ((char *, CORE_ADDR *));
 334   void        (*to_create_inferior) PARAMS ((char *, char *, char **));
 335   void        (*to_post_startup_inferior) PARAMS ((int));
 336   void        (*to_acknowledge_created_inferior) PARAMS ((int));
 337   void        (*to_clone_and_follow_inferior) PARAMS ((int, int *));
 338   void        (*to_post_follow_inferior_by_clone) PARAMS ((void));
 339   int         (*to_insert_fork_catchpoint) PARAMS ((int));
 340   int         (*to_remove_fork_catchpoint) PARAMS ((int));
 341   int         (*to_insert_vfork_catchpoint) PARAMS ((int));
 342   int         (*to_remove_vfork_catchpoint) PARAMS ((int));
 343   int         (*to_has_forked) PARAMS ((int, int *));
 344   int         (*to_has_vforked) PARAMS ((int, int *));
 345   int         (*to_can_follow_vfork_prior_to_exec) PARAMS ((void));
 346   void        (*to_post_follow_vfork) PARAMS ((int, int, int, int));
 347   int         (*to_insert_exec_catchpoint) PARAMS ((int));
 348   int         (*to_remove_exec_catchpoint) PARAMS ((int));
 349   int         (*to_has_execd) PARAMS ((int, char **));
 350   int         (*to_reported_exec_events_per_exec_call) PARAMS ((void));
 351   int         (*to_has_syscall_event) PARAMS ((int, enum target_waitkind *, int *));
 352   int         (*to_has_exited) PARAMS ((int, int, int *));
 353   void        (*to_mourn_inferior) PARAMS ((void));
 354   int         (*to_can_run) PARAMS ((void));
 355   void        (*to_notice_signals) PARAMS ((int pid));
 356   int         (*to_thread_alive) PARAMS ((int pid));
 357   void        (*to_stop) PARAMS ((void));
 358   struct symtab_and_line * (*to_enable_exception_callback) PARAMS ((enum exception_event_kind, int));
 359   struct exception_event_record * (*to_get_current_exception_event) PARAMS ((void));
 360   char *      (*to_pid_to_exec_file) PARAMS ((int pid));
 361   char *      (*to_core_file_to_sym_file) PARAMS ((char *));
 362   enum strata   to_stratum;
 363   struct target_ops
 364                 *DONT_USE;      /* formerly to_next */
 365   int           to_has_all_memory;
 366   int           to_has_memory;
 367   int           to_has_stack;
 368   int           to_has_registers;
 369   int           to_has_execution;
 370   int           to_has_thread_control;  /* control thread execution */
 371   struct section_table
 372                *to_sections;
 373   struct section_table
 374                *to_sections_end;
 375   int           to_magic;
 376   /* Need sub-structure for target machine related rather than comm related? */
 377 };
 378
 379 /* Magic number for checking ops size.  If a struct doesn't end with this
 380    number, somebody changed the declaration but didn't change all the
 381    places that initialize one.  */
 382
 383 #define OPS_MAGIC       3840
 384
 385 /* The ops structure for our "current" target process.  This should
 386    never be NULL.  If there is no target, it points to the dummy_target.  */
 387
 388 extern struct target_ops        current_target;
 389
 390 /* An item on the target stack.  */
 391
 392 struct target_stack_item
 393 {
 394   struct target_stack_item *next;
 395   struct target_ops *target_ops;
 396 };
 397
 398 /* The target stack.  */
 399
 400 extern struct target_stack_item *target_stack;
 401
 402 /* Define easy words for doing these operations on our current target.  */
 403
 404 #define target_shortname        (current_target.to_shortname)
 405 #define target_longname         (current_target.to_longname)
 406
 407 /* The open routine takes the rest of the parameters from the command,
 408    and (if successful) pushes a new target onto the stack.
 409    Targets should supply this routine, if only to provide an error message.  */
 410 #define target_open(name, from_tty)     \
 411         (*current_target.to_open) (name, from_tty)
 412
 413 /* Does whatever cleanup is required for a target that we are no longer
 414    going to be calling.  Argument says whether we are quitting gdb and
 415    should not get hung in case of errors, or whether we want a clean
 416    termination even if it takes a while.  This routine is automatically
 417    always called just before a routine is popped off the target stack.
 418    Closing file descriptors and freeing memory are typical things it should
 419    do.  */
 420
 421 #define target_close(quitting)  \
 422         (*current_target.to_close) (quitting)
 423
 424 /* Attaches to a process on the target side.  Arguments are as passed
 425    to the `attach' command by the user.  This routine can be called
 426    when the target is not on the target-stack, if the target_can_run
 427    routine returns 1; in that case, it must push itself onto the stack.
 428    Upon exit, the target should be ready for normal operations, and
 429    should be ready to deliver the status of the process immediately
 430    (without waiting) to an upcoming target_wait call.  */
 431
 432 #define target_attach(args, from_tty)   \
 433         (*current_target.to_attach) (args, from_tty)
 434
 435 /* The target_attach operation places a process under debugger control,
 436    and stops the process.
 437
 438    This operation provides a target-specific hook that allows the
 439    necessary bookkeeping to be performed after an attach completes.
 440    */
 441 #define target_post_attach(pid) \
 442         (*current_target.to_post_attach) (pid)
 443
 444 /* Attaches to a process on the target side, if not already attached.
 445    (If already attached, takes no action.)
 446
 447    This operation can be used to follow the child process of a fork.
 448    On some targets, such child processes of an original inferior process
 449    are automatically under debugger control, and thus do not require an
 450    actual attach operation.  */
 451
 452 #define target_require_attach(args, from_tty)   \
 453         (*current_target.to_require_attach) (args, from_tty)
 454
 455 /* Takes a program previously attached to and detaches it.
 456    The program may resume execution (some targets do, some don't) and will
 457    no longer stop on signals, etc.  We better not have left any breakpoints
 458    in the program or it'll die when it hits one.  ARGS is arguments
 459    typed by the user (e.g. a signal to send the process).  FROM_TTY
 460    says whether to be verbose or not.  */
 461
 462 extern void
 463 target_detach PARAMS ((char *, int));
 464
 465 /* Detaches from a process on the target side, if not already dettached.
 466    (If already detached, takes no action.)
 467
 468    This operation can be used to follow the parent process of a fork.
 469    On some targets, such child processes of an original inferior process
 470    are automatically under debugger control, and thus do require an actual
 471    detach operation.
 472
 473    PID is the process id of the child to detach from.
 474    ARGS is arguments typed by the user (e.g. a signal to send the process).
 475    FROM_TTY says whether to be verbose or not.  */
 476
 477 #define target_require_detach(pid, args, from_tty) \
 478         (*current_target.to_require_detach) (pid, args, from_tty)
 479
 480 /* Resume execution of the target process PID.  STEP says whether to
 481    single-step or to run free; SIGGNAL is the signal to be given to
 482    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 483    pass TARGET_SIGNAL_DEFAULT.  */
 484
 485 #define target_resume(pid, step, siggnal)       \
 486         (*current_target.to_resume) (pid, step, siggnal)
 487
 488 /* Wait for process pid to do something.  Pid = -1 to wait for any pid
 489    to do something.  Return pid of child, or -1 in case of error;
 490    store status through argument pointer STATUS.  Note that it is
 491    *not* OK to return_to_top_level out of target_wait without popping
 492    the debugging target from the stack; GDB isn't prepared to get back
 493    to the prompt with a debugging target but without the frame cache,
 494    stop_pc, etc., set up.  */
 495
 496 #define target_wait(pid, status)                \
 497         (*current_target.to_wait) (pid, status)
 498
 499 /* The target_wait operation waits for a process event to occur, and
 500    thereby stop the process.
 501
 502    On some targets, certain events may happen in sequences.  gdb's
 503    correct response to any single event of such a sequence may require
 504    knowledge of what earlier events in the sequence have been seen.
 505
 506    This operation provides a target-specific hook that allows the
 507    necessary bookkeeping to be performed to track such sequences.
 508    */
 509
 510 #define target_post_wait(pid, status) \
 511         (*current_target.to_post_wait) (pid, status)
 512
 513 /* Fetch register REGNO, or all regs if regno == -1.  No result.  */
 514
 515 #define target_fetch_registers(regno)   \
 516         (*current_target.to_fetch_registers) (regno)
 517
 518 /* Store at least register REGNO, or all regs if REGNO == -1.
 519    It can store as many registers as it wants to, so target_prepare_to_store
 520    must have been previously called.  Calls error() if there are problems.  */
 521
 522 #define target_store_registers(regs)    \
 523         (*current_target.to_store_registers) (regs)
 524
 525 /* Get ready to modify the registers array.  On machines which store
 526    individual registers, this doesn't need to do anything.  On machines
 527    which store all the registers in one fell swoop, this makes sure
 528    that REGISTERS contains all the registers from the program being
 529    debugged.  */
 530
 531 #define target_prepare_to_store()       \
 532         (*current_target.to_prepare_to_store) ()
 533
 534 extern int target_read_string PARAMS ((CORE_ADDR, char **, int, int *));
 535
 536 extern int
 537 target_read_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, int len));
 538
 539 extern int
 540 target_read_memory_section PARAMS ((CORE_ADDR memaddr, char *myaddr, int len,
 541                                     asection *bfd_section));
 542
 543 extern int
 544 target_read_memory_partial PARAMS ((CORE_ADDR, char *, int, int *));
 545
 546 extern int
 547 target_write_memory PARAMS ((CORE_ADDR, char *, int));
 548
 549 extern int
 550 xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
 551
 552 extern int
 553 child_xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
 554
 555 extern char *
 556 child_pid_to_exec_file PARAMS ((int));
 557
 558 extern char *
 559 child_core_file_to_sym_file PARAMS ((char *));
 560
 561 extern void
 562 child_post_attach PARAMS ((int));
 563
 564 extern void
 565 child_post_wait PARAMS ((int, int));
 566
 567 extern void
 568 child_post_startup_inferior PARAMS ((int));
 569
 570 extern void
 571 child_acknowledge_created_inferior PARAMS ((int));
 572
 573 extern void
 574 child_clone_and_follow_inferior PARAMS ((int, int *));
 575
 576 extern void
 577 child_post_follow_inferior_by_clone PARAMS ((void));
 578
 579 extern int
 580 child_insert_fork_catchpoint PARAMS ((int));
 581
 582 extern int
 583 child_remove_fork_catchpoint PARAMS ((int));
 584
 585 extern int
 586 child_insert_vfork_catchpoint PARAMS ((int));
 587
 588 extern int
 589 child_remove_vfork_catchpoint PARAMS ((int));
 590
 591 extern int
 592 child_has_forked PARAMS ((int, int *));
 593
 594 extern int
 595 child_has_vforked PARAMS ((int, int *));
 596
 597 extern void
 598 child_acknowledge_created_inferior PARAMS ((int));
 599
 600 extern int
 601 child_can_follow_vfork_prior_to_exec PARAMS ((void));
 602
 603 extern void
 604 child_post_follow_vfork PARAMS ((int, int, int, int));
 605
 606 extern int
 607 child_insert_exec_catchpoint PARAMS ((int));
 608
 609 extern int
 610 child_remove_exec_catchpoint PARAMS ((int));
 611
 612 extern int
 613 child_has_execd PARAMS ((int, char **));
 614
 615 extern int
 616 child_reported_exec_events_per_exec_call PARAMS ((void));
 617
 618 extern int
 619 child_has_syscall_event PARAMS ((int, enum target_waitkind *, int *));
 620
 621 extern int
 622 child_has_exited PARAMS ((int, int, int *));
 623
 624 extern int
 625 child_thread_alive PARAMS ((int));
 626
 627 /* From exec.c */
 628
 629 extern void
 630 print_section_info PARAMS ((struct target_ops *, bfd *));
 631
 632 /* Print a line about the current target.  */
 633
 634 #define target_files_info()     \
 635         (*current_target.to_files_info) (&current_target)
 636
 637 /* Insert a breakpoint at address ADDR in the target machine.
 638    SAVE is a pointer to memory allocated for saving the
 639    target contents.  It is guaranteed by the caller to be long enough
 640    to save "sizeof BREAKPOINT" bytes.  Result is 0 for success, or
 641    an errno value.  */
 642
 643 #define target_insert_breakpoint(addr, save)    \
 644         (*current_target.to_insert_breakpoint) (addr, save)
 645
 646 /* Remove a breakpoint at address ADDR in the target machine.
 647    SAVE is a pointer to the same save area
 648    that was previously passed to target_insert_breakpoint.
 649    Result is 0 for success, or an errno value.  */
 650
 651 #define target_remove_breakpoint(addr, save)    \
 652         (*current_target.to_remove_breakpoint) (addr, save)
 653
 654 /* Initialize the terminal settings we record for the inferior,
 655    before we actually run the inferior.  */
 656
 657 #define target_terminal_init() \
 658         (*current_target.to_terminal_init) ()
 659
 660 /* Put the inferior's terminal settings into effect.
 661    This is preparation for starting or resuming the inferior.  */
 662
 663 #define target_terminal_inferior() \
 664         (*current_target.to_terminal_inferior) ()
 665
 666 /* Put some of our terminal settings into effect,
 667    enough to get proper results from our output,
 668    but do not change into or out of RAW mode
 669    so that no input is discarded.
 670
 671    After doing this, either terminal_ours or terminal_inferior
 672    should be called to get back to a normal state of affairs.  */
 673
 674 #define target_terminal_ours_for_output() \
 675         (*current_target.to_terminal_ours_for_output) ()
 676
 677 /* Put our terminal settings into effect.
 678    First record the inferior's terminal settings
 679    so they can be restored properly later.  */
 680
 681 #define target_terminal_ours() \
 682         (*current_target.to_terminal_ours) ()
 683
 684 /* Print useful information about our terminal status, if such a thing
 685    exists.  */
 686
 687 #define target_terminal_info(arg, from_tty) \
 688         (*current_target.to_terminal_info) (arg, from_tty)
 689
 690 /* Kill the inferior process.   Make it go away.  */
 691
 692 #define target_kill() \
 693         (*current_target.to_kill) ()
 694
 695 /* Load an executable file into the target process.  This is expected to
 696    not only bring new code into the target process, but also to update
 697    GDB's symbol tables to match.  */
 698
 699 #define target_load(arg, from_tty) \
 700         (*current_target.to_load) (arg, from_tty)
 701
 702 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 703    name.  ADDRP is a CORE_ADDR * pointing to where the value of the symbol
 704    should be returned.  The result is 0 if successful, nonzero if the
 705    symbol does not exist in the target environment.  This function should
 706    not call error() if communication with the target is interrupted, since
 707    it is called from symbol reading, but should return nonzero, possibly
 708    doing a complain().  */
 709
 710 #define target_lookup_symbol(name, addrp)       \
 711   (*current_target.to_lookup_symbol) (name, addrp)
 712
 713 /* Start an inferior process and set inferior_pid to its pid.
 714    EXEC_FILE is the file to run.
 715    ALLARGS is a string containing the arguments to the program.
 716    ENV is the environment vector to pass.  Errors reported with error().
 717    On VxWorks and various standalone systems, we ignore exec_file.  */
 718
 719 #define target_create_inferior(exec_file, args, env)    \
 720         (*current_target.to_create_inferior) (exec_file, args, env)
 721
 722
 723 /* Some targets (such as ttrace-based HPUX) don't allow us to request
 724    notification of inferior events such as fork and vork immediately
 725    after the inferior is created.  (This because of how gdb gets an
 726    inferior created via invoking a shell to do it.  In such a scenario,
 727    if the shell init file has commands in it, the shell will fork and
 728    exec for each of those commands, and we will see each such fork
 729    event.  Very bad.)
 730
 731    Such targets will supply an appropriate definition for this function.
 732    */
 733 #define target_post_startup_inferior(pid) \
 734         (*current_target.to_post_startup_inferior) (pid)
 735
 736 /* On some targets, the sequence of starting up an inferior requires
 737    some synchronization between gdb and the new inferior process, PID.
 738    */
 739 #define target_acknowledge_created_inferior(pid) \
 740         (*current_target.to_acknowledge_created_inferior) (pid)
 741
 742 /* An inferior process has been created via a fork() or similar
 743    system call.  This function will clone the debugger, then ensure
 744    that CHILD_PID is attached to by that debugger.
 745
 746    FOLLOWED_CHILD is set TRUE on return *for the clone debugger only*,
 747    and FALSE otherwise.  (The original and clone debuggers can use this
 748    to determine which they are, if need be.)
 749
 750    (This is not a terribly useful feature without a GUI to prevent
 751    the two debuggers from competing for shell input.)
 752    */
 753 #define target_clone_and_follow_inferior(child_pid,followed_child) \
 754         (*current_target.to_clone_and_follow_inferior) (child_pid, followed_child)
 755
 756 /* This operation is intended to be used as the last in a sequence of
 757    steps taken when following both parent and child of a fork.  This
 758    is used by a clone of the debugger, which will follow the child.
 759
 760    The original debugger has detached from this process, and the
 761    clone has attached to it.
 762
 763    On some targets, this requires a bit of cleanup to make it work
 764    correctly.
 765    */
 766 #define target_post_follow_inferior_by_clone() \
 767         (*current_target.to_post_follow_inferior_by_clone) ()
 768
 769 /* On some targets, we can catch an inferior fork or vfork event when it
 770    occurs.  These functions insert/remove an already-created catchpoint for
 771    such events.
 772    */
 773 #define target_insert_fork_catchpoint(pid) \
 774         (*current_target.to_insert_fork_catchpoint) (pid)
 775
 776 #define target_remove_fork_catchpoint(pid) \
 777         (*current_target.to_remove_fork_catchpoint) (pid)
 778
 779 #define target_insert_vfork_catchpoint(pid) \
 780         (*current_target.to_insert_vfork_catchpoint) (pid)
 781
 782 #define target_remove_vfork_catchpoint(pid) \
 783         (*current_target.to_remove_vfork_catchpoint) (pid)
 784
 785 /* Returns TRUE if PID has invoked the fork() system call.  And,
 786    also sets CHILD_PID to the process id of the other ("child")
 787    inferior process that was created by that call.
 788    */
 789 #define target_has_forked(pid,child_pid) \
 790         (*current_target.to_has_forked) (pid,child_pid)
 791
 792 /* Returns TRUE if PID has invoked the vfork() system call.  And,
 793    also sets CHILD_PID to the process id of the other ("child")
 794    inferior process that was created by that call.
 795    */
 796 #define target_has_vforked(pid,child_pid) \
 797         (*current_target.to_has_vforked) (pid,child_pid)
 798
 799 /* Some platforms (such as pre-10.20 HP-UX) don't allow us to do
 800    anything to a vforked child before it subsequently calls exec().
 801    On such platforms, we say that the debugger cannot "follow" the
 802    child until it has vforked.
 803
 804    This function should be defined to return 1 by those targets
 805    which can allow the debugger to immediately follow a vforked
 806    child, and 0 if they cannot.
 807    */
 808 #define target_can_follow_vfork_prior_to_exec() \
 809         (*current_target.to_can_follow_vfork_prior_to_exec) ()
 810
 811 /* An inferior process has been created via a vfork() system call.
 812    The debugger has followed the parent, the child, or both.  The
 813    process of setting up for that follow may have required some
 814    target-specific trickery to track the sequence of reported events.
 815    If so, this function should be defined by those targets that
 816    require the debugger to perform cleanup or initialization after
 817    the vfork follow.
 818    */
 819 #define target_post_follow_vfork(parent_pid,followed_parent,child_pid,followed_child) \
 820         (*current_target.to_post_follow_vfork) (parent_pid,followed_parent,child_pid,followed_child)
 821
 822 /* On some targets, we can catch an inferior exec event when it
 823    occurs.  These functions insert/remove an already-created catchpoint
 824    for such events.
 825    */
 826 #define target_insert_exec_catchpoint(pid) \
 827         (*current_target.to_insert_exec_catchpoint) (pid)
 828
 829 #define target_remove_exec_catchpoint(pid) \
 830         (*current_target.to_remove_exec_catchpoint) (pid)
 831
 832 /* Returns TRUE if PID has invoked a flavor of the exec() system call.
 833    And, also sets EXECD_PATHNAME to the pathname of the executable file
 834    that was passed to exec(), and is now being executed.
 835    */
 836 #define target_has_execd(pid,execd_pathname) \
 837         (*current_target.to_has_execd) (pid,execd_pathname)
 838
 839 /* Returns the number of exec events that are reported when a process
 840    invokes a flavor of the exec() system call on this target, if exec
 841    events are being reported.
 842    */
 843 #define target_reported_exec_events_per_exec_call() \
 844         (*current_target.to_reported_exec_events_per_exec_call) ()
 845
 846 /* Returns TRUE if PID has reported a syscall event.  And, also sets
 847    KIND to the appropriate TARGET_WAITKIND_, and sets SYSCALL_ID to
 848    the unique integer ID of the syscall.
 849    */
 850 #define target_has_syscall_event(pid,kind,syscall_id) \
 851   (*current_target.to_has_syscall_event) (pid,kind,syscall_id)
 852
 853 /* Returns TRUE if PID has exited.  And, also sets EXIT_STATUS to the
 854    exit code of PID, if any.
 855    */
 856 #define target_has_exited(pid,wait_status,exit_status) \
 857         (*current_target.to_has_exited) (pid,wait_status,exit_status)
 858
 859 /* The debugger has completed a blocking wait() call.  There is now
 860    some process event that must be processed.  This function should
 861    be defined by those targets that require the debugger to perform
 862    cleanup or internal state changes in response to the process event.
 863    */
 864
 865 /* The inferior process has died.  Do what is right.  */
 866
 867 #define target_mourn_inferior() \
 868         (*current_target.to_mourn_inferior) ()
 869
 870 /* Does target have enough data to do a run or attach command? */
 871
 872 #define target_can_run(t) \
 873         ((t)->to_can_run) ()
 874
 875 /* post process changes to signal handling in the inferior.  */
 876
 877 #define target_notice_signals(pid) \
 878         (*current_target.to_notice_signals) (pid)
 879
 880 /* Check to see if a thread is still alive.  */
 881
 882 #define target_thread_alive(pid) \
 883         (*current_target.to_thread_alive) (pid)
 884
 885 /* Make target stop in a continuable fashion.  (For instance, under Unix, this
 886    should act like SIGSTOP).  This function is normally used by GUIs to
 887    implement a stop button.  */
 888
 889 #define target_stop current_target.to_stop
 890
 891 /* Get the symbol information for a breakpointable routine called when
 892    an exception event occurs.
 893    Intended mainly for C++, and for those
 894    platforms/implementations where such a callback mechanism is available,
 895    e.g. HP-UX with ANSI C++ (aCC).  Some compilers (e.g. g++) support
 896    different mechanisms for debugging exceptions. */
 897
 898 #define target_enable_exception_callback(kind, enable) \
 899         (*current_target.to_enable_exception_callback) (kind, enable)
 900
 901 /* Get the current exception event kind -- throw or catch, etc. */
 902
 903 #define target_get_current_exception_event() \
 904         (*current_target.to_get_current_exception_event) ()
 905
 906 /* Pointer to next target in the chain, e.g. a core file and an exec file.  */
 907
 908 #define target_next \
 909         (current_target.to_next)
 910
 911 /* Does the target include all of memory, or only part of it?  This
 912    determines whether we look up the target chain for other parts of
 913    memory if this target can't satisfy a request.  */
 914
 915 #define target_has_all_memory   \
 916         (current_target.to_has_all_memory)
 917
 918 /* Does the target include memory?  (Dummy targets don't.)  */
 919
 920 #define target_has_memory       \
 921         (current_target.to_has_memory)
 922
 923 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 924    we start a process.)  */
 925
 926 #define target_has_stack        \
 927         (current_target.to_has_stack)
 928
 929 /* Does the target have registers?  (Exec files don't.)  */
 930
 931 #define target_has_registers    \
 932         (current_target.to_has_registers)
 933
 934 /* Does the target have execution?  Can we make it jump (through
 935    hoops), or pop its stack a few times?  FIXME: If this is to work that
 936    way, it needs to check whether an inferior actually exists.
 937    remote-udi.c and probably other targets can be the current target
 938    when the inferior doesn't actually exist at the moment.  Right now
 939    this just tells us whether this target is *capable* of execution.  */
 940
 941 #define target_has_execution    \
 942         (current_target.to_has_execution)
 943
 944 /* Can the target support the debugger control of thread execution?
 945    a) Can it lock the thread scheduler?
 946    b) Can it switch the currently running thread?  */
 947
 948 #define target_can_lock_scheduler \
 949         (current_target.to_has_thread_control & tc_schedlock)
 950
 951 #define target_can_switch_threads \
 952         (current_target.to_has_thread_control & tc_switch)
 953
 954 extern void target_link PARAMS ((char *, CORE_ADDR *));
 955
 956 /* Converts a process id to a string.  Usually, the string just contains
 957    `process xyz', but on some systems it may contain
 958    `process xyz thread abc'.  */
 959
 960 #ifndef target_pid_to_str
 961 #define target_pid_to_str(PID) \
 962         normal_pid_to_str (PID)
 963 extern char *normal_pid_to_str PARAMS ((int pid));
 964 #endif
 965
 966 #ifndef target_tid_to_str
 967 #define target_tid_to_str(PID) \
 968         normal_pid_to_str (PID)
 969 extern char *normal_pid_to_str PARAMS ((int pid));
 970 #endif
 971
 972
 973 #ifndef target_new_objfile
 974 #define target_new_objfile(OBJFILE)
 975 #endif
 976
 977 #ifndef target_pid_or_tid_to_str
 978 #define target_pid_or_tid_to_str(ID) \
 979         normal_pid_to_str (ID)
 980 #endif
 981
 982 /* Attempts to find the pathname of the executable file
 983    that was run to create a specified process.
 984
 985    The process PID must be stopped when this operation is used.
 986
 987    If the executable file cannot be determined, NULL is returned.
 988
 989    Else, a pointer to a character string containing the pathname
 990    is returned.  This string should be copied into a buffer by
 991    the client if the string will not be immediately used, or if
 992    it must persist.
 993    */
 994
 995 #define target_pid_to_exec_file(pid) \
 996         (current_target.to_pid_to_exec_file) (pid)
 997
 998 /* Hook to call target-dependant code after reading in a new symbol table. */
 999
1000 #ifndef TARGET_SYMFILE_POSTREAD
1001 #define TARGET_SYMFILE_POSTREAD(OBJFILE)
1002 #endif
1003
1004 /* Hook to call target dependant code just after inferior target process has
1005    started.  */
1006
1007 #ifndef TARGET_CREATE_INFERIOR_HOOK
1008 #define TARGET_CREATE_INFERIOR_HOOK(PID)
1009 #endif
1010
1011 /* Hardware watchpoint interfaces.  */
1012
1013 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
1014    write).  */
1015
1016 #ifndef STOPPED_BY_WATCHPOINT
1017 #define STOPPED_BY_WATCHPOINT(w) 0
1018 #endif
1019
1020 /* HP-UX supplies these operations, which respectively disable and enable
1021    the memory page-protections that are used to implement hardware watchpoints
1022    on that platform.  See wait_for_inferior's use of these.
1023    */
1024 #if !defined(TARGET_DISABLE_HW_WATCHPOINTS)
1025 #define TARGET_DISABLE_HW_WATCHPOINTS(pid)
1026 #endif
1027
1028 #if !defined(TARGET_ENABLE_HW_WATCHPOINTS)
1029 #define TARGET_ENABLE_HW_WATCHPOINTS(pid)
1030 #endif
1031
1032 /* Provide defaults for systems that don't support hardware watchpoints. */
1033
1034 #ifndef TARGET_HAS_HARDWARE_WATCHPOINTS
1035
1036 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
1037    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
1038    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
1039    (including this one?).  OTHERTYPE is who knows what...  */
1040
1041 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) 0
1042
1043 #if !defined(TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT)
1044 #define TARGET_REGION_SIZE_OK_FOR_HW_WATCHPOINT(byte_count) \
1045         (LONGEST)(byte_count) <= REGISTER_SIZE
1046 #endif
1047
1048 /* However, some addresses may not be profitable to use hardware to watch,
1049    or may be difficult to understand when the addressed object is out of
1050    scope, and hence should be unwatched.  On some targets, this may have
1051    severe performance penalties, such that we might as well use regular
1052    watchpoints, and save (possibly precious) hardware watchpoints for other
1053    locations.
1054    */
1055 #if !defined(TARGET_RANGE_PROFITABLE_FOR_HW_WATCHPOINT)
1056 #define TARGET_RANGE_PROFITABLE_FOR_HW_WATCHPOINT(pid,start,len) 0
1057 #endif
1058
1059
1060 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
1061    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
1062    success, non-zero for failure.  */
1063
1064 #define target_remove_watchpoint(ADDR,LEN,TYPE) -1
1065 #define target_insert_watchpoint(ADDR,LEN,TYPE) -1
1066
1067 #endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */
1068
1069 #ifndef target_insert_hw_breakpoint
1070 #define target_remove_hw_breakpoint(ADDR,SHADOW) -1
1071 #define target_insert_hw_breakpoint(ADDR,SHADOW) -1
1072 #endif
1073
1074 #ifndef target_stopped_data_address
1075 #define target_stopped_data_address() 0
1076 #endif
1077
1078 /* If defined, then we need to decr pc by this much after a hardware break-
1079    point.  Presumably this overrides DECR_PC_AFTER_BREAK...  */
1080
1081 #ifndef DECR_PC_AFTER_HW_BREAK
1082 #define DECR_PC_AFTER_HW_BREAK 0
1083 #endif
1084
1085 /* Sometimes gdb may pick up what appears to be a valid target address
1086    from a minimal symbol, but the value really means, essentially,
1087    "This is an index into a table which is populated when the inferior
1088    is run.  Therefore, do not attempt to use this as a PC."
1089    */
1090 #if !defined(PC_REQUIRES_RUN_BEFORE_USE)
1091 #define PC_REQUIRES_RUN_BEFORE_USE(pc) (0)
1092 #endif
1093
1094 /* This will only be defined by a target that supports catching vfork events,
1095    such as HP-UX.
1096
1097    On some targets (such as HP-UX 10.20 and earlier), resuming a newly vforked
1098    child process after it has exec'd, causes the parent process to resume as
1099    well.  To prevent the parent from running spontaneously, such targets should
1100    define this to a function that prevents that from happening.
1101    */
1102 #if !defined(ENSURE_VFORKING_PARENT_REMAINS_STOPPED)
1103 #define ENSURE_VFORKING_PARENT_REMAINS_STOPPED(PID) (0)
1104 #endif
1105
1106 /* This will only be defined by a target that supports catching vfork events,
1107    such as HP-UX.
1108
1109    On some targets (such as HP-UX 10.20 and earlier), a newly vforked child
1110    process must be resumed when it delivers its exec event, before the parent
1111    vfork event will be delivered to us.
1112    */
1113 #if !defined(RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK)
1114 #define RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK() (0)
1115 #endif
1116
1117 /* Routines for maintenance of the target structures...
1118
1119    add_target:   Add a target to the list of all possible targets.
1120
1121    push_target:  Make this target the top of the stack of currently used
1122                  targets, within its particular stratum of the stack.  Result
1123                  is 0 if now atop the stack, nonzero if not on top (maybe
1124                  should warn user).
1125
1126    unpush_target: Remove this from the stack of currently used targets,
1127                  no matter where it is on the list.  Returns 0 if no
1128                  change, 1 if removed from stack.
1129
1130    pop_target:   Remove the top thing on the stack of current targets.  */
1131
1132 extern void
1133 add_target PARAMS ((struct target_ops *));
1134
1135 extern int
1136 push_target PARAMS ((struct target_ops *));
1137
1138 extern int
1139 unpush_target PARAMS ((struct target_ops *));
1140
1141 extern void
1142 target_preopen PARAMS ((int));
1143
1144 extern void
1145 pop_target PARAMS ((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   CORE_ADDR addr;               /* Lowest address in section */
1153   CORE_ADDR endaddr;            /* 1+highest address in section */
1154
1155   sec_ptr the_bfd_section;
1156
1157   bfd      *bfd;                /* BFD file pointer */
1158 };
1159
1160 /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
1161    Returns 0 if OK, 1 on error.  */
1162
1163 extern int
1164 build_section_table PARAMS ((bfd *, struct section_table **,
1165                              struct section_table **));
1166
1167 /* From mem-break.c */
1168
1169 extern int memory_remove_breakpoint PARAMS ((CORE_ADDR, char *));
1170
1171 extern int memory_insert_breakpoint PARAMS ((CORE_ADDR, char *));
1172
1173 extern breakpoint_from_pc_fn memory_breakpoint_from_pc;
1174 #ifndef BREAKPOINT_FROM_PC
1175 #define BREAKPOINT_FROM_PC(pcptr, lenptr) memory_breakpoint_from_pc (pcptr, lenptr)
1176 #endif
1177
1178
1179 /* From target.c */
1180
1181 extern void
1182 initialize_targets PARAMS ((void));
1183
1184 extern void
1185 noprocess PARAMS ((void));
1186
1187 extern void
1188 find_default_attach PARAMS ((char *, int));
1189
1190 void
1191 find_default_require_attach PARAMS ((char *, int));
1192
1193 void
1194 find_default_require_detach PARAMS ((int, char *, int));
1195
1196 extern void
1197 find_default_create_inferior PARAMS ((char *, char *, char **));
1198
1199 void
1200 find_default_clone_and_follow_inferior PARAMS ((int, int *));
1201
1202 extern struct target_ops *
1203 find_core_target PARAMS ((void));
1204 \f
1205 /* Stuff that should be shared among the various remote targets.  */
1206
1207 /* Debugging level.  0 is off, and non-zero values mean to print some debug
1208    information (higher values, more information).  */
1209 extern int remote_debug;
1210
1211 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
1212 extern int baud_rate;
1213 /* Timeout limit for response from target. */
1214 extern int remote_timeout;
1215
1216 extern asection *target_memory_bfd_section;
1217 \f
1218 /* Functions for helping to write a native target.  */
1219
1220 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
1221 extern void store_waitstatus PARAMS ((struct target_waitstatus *, int));
1222
1223 /* Convert between host signal numbers and enum target_signal's.  */
1224 extern enum target_signal target_signal_from_host PARAMS ((int));
1225 extern int target_signal_to_host PARAMS ((enum target_signal));
1226
1227 /* Convert from a number used in a GDB command to an enum target_signal.  */
1228 extern enum target_signal target_signal_from_command PARAMS ((int));
1229
1230 /* Any target can call this to switch to remote protocol (in remote.c). */
1231 extern void push_remote_target PARAMS ((char *name, int from_tty));
1232 \f
1233 /* Imported from machine dependent code */
1234
1235 #ifndef SOFTWARE_SINGLE_STEP_P
1236 #define SOFTWARE_SINGLE_STEP_P 0
1237 #define SOFTWARE_SINGLE_STEP(sig,bp_p) abort ()
1238 #endif /* SOFTWARE_SINGLE_STEP_P */
1239
1240 /* Blank target vector entries are initialized to target_ignore. */
1241 void target_ignore PARAMS ((void));
1242
1243 /* Macro for getting target's idea of a frame pointer.
1244    FIXME: GDB's whole scheme for dealing with "frames" and
1245    "frame pointers" needs a serious shakedown.  */
1246 #ifndef TARGET_VIRTUAL_FRAME_POINTER
1247 #define TARGET_VIRTUAL_FRAME_POINTER(ADDR, REGP, OFFP) \
1248    do { *(REGP) = FP_REGNUM; *(OFFP) =  0; } while (0)
1249 #endif /* TARGET_VIRTUAL_FRAME_POINTER */
1250
1251 #endif  /* !defined (TARGET_H) */