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
  45 enum strata {
  46         dummy_stratum,          /* The lowest of the low */
  47         file_stratum,           /* Executable files, etc */
  48         core_stratum,           /* Core dump files */
  49         download_stratum,       /* Downloading of remote targets */
  50         process_stratum         /* Executing processes */
  51 };
  52
  53 /* Stuff for target_wait.  */
  54
  55 /* Generally, what has the program done?  */
  56 enum target_waitkind {
  57   /* The program has exited.  The exit status is in value.integer.  */
  58   TARGET_WAITKIND_EXITED,
  59
  60   /* The program has stopped with a signal.  Which signal is in value.sig.  */
  61   TARGET_WAITKIND_STOPPED,
  62
  63   /* The program has terminated with a signal.  Which signal is in
  64      value.sig.  */
  65   TARGET_WAITKIND_SIGNALLED,
  66
  67   /* The program is letting us know that it dynamically loaded something
  68      (e.g. it called load(2) on AIX).  */
  69   TARGET_WAITKIND_LOADED,
  70
  71   /* Nothing happened, but we stopped anyway.  This perhaps should be handled
  72      within target_wait, but I'm not sure target_wait should be resuming the
  73      inferior.  */
  74   TARGET_WAITKIND_SPURIOUS
  75   };
  76
  77 /* The numbering of these signals is chosen to match traditional unix
  78    signals (insofar as various unices use the same numbers, anyway).
  79    It is also the numbering of the GDB remote protocol.  Other remote
  80    protocols, if they use a different numbering, should make sure to
  81    translate appropriately.  */
  82
  83 /* This is based strongly on Unix/POSIX signals for several reasons:
  84    (1) This set of signals represents a widely-accepted attempt to
  85    represent events of this sort in a portable fashion, (2) we want a
  86    signal to make it from wait to child_wait to the user intact, (3) many
  87    remote protocols use a similar encoding.  However, it is
  88    recognized that this set of signals has limitations (such as not
  89    distinguishing between various kinds of SIGSEGV, or not
  90    distinguishing hitting a breakpoint from finishing a single step).
  91    So in the future we may get around this either by adding additional
  92    signals for breakpoint, single-step, etc., or by adding signal
  93    codes; the latter seems more in the spirit of what BSD, System V,
  94    etc. are doing to address these issues.  */
  95
  96 /* For an explanation of what each signal means, see
  97    target_signal_to_string.  */
  98
  99 enum target_signal {
 100   /* Used some places (e.g. stop_signal) to record the concept that
 101      there is no signal.  */
 102   TARGET_SIGNAL_0 = 0,
 103   TARGET_SIGNAL_FIRST = 0,
 104   TARGET_SIGNAL_HUP = 1,
 105   TARGET_SIGNAL_INT = 2,
 106   TARGET_SIGNAL_QUIT = 3,
 107   TARGET_SIGNAL_ILL = 4,
 108   TARGET_SIGNAL_TRAP = 5,
 109   TARGET_SIGNAL_ABRT = 6,
 110   TARGET_SIGNAL_EMT = 7,
 111   TARGET_SIGNAL_FPE = 8,
 112   TARGET_SIGNAL_KILL = 9,
 113   TARGET_SIGNAL_BUS = 10,
 114   TARGET_SIGNAL_SEGV = 11,
 115   TARGET_SIGNAL_SYS = 12,
 116   TARGET_SIGNAL_PIPE = 13,
 117   TARGET_SIGNAL_ALRM = 14,
 118   TARGET_SIGNAL_TERM = 15,
 119   TARGET_SIGNAL_URG = 16,
 120   TARGET_SIGNAL_STOP = 17,
 121   TARGET_SIGNAL_TSTP = 18,
 122   TARGET_SIGNAL_CONT = 19,
 123   TARGET_SIGNAL_CHLD = 20,
 124   TARGET_SIGNAL_TTIN = 21,
 125   TARGET_SIGNAL_TTOU = 22,
 126   TARGET_SIGNAL_IO = 23,
 127   TARGET_SIGNAL_XCPU = 24,
 128   TARGET_SIGNAL_XFSZ = 25,
 129   TARGET_SIGNAL_VTALRM = 26,
 130   TARGET_SIGNAL_PROF = 27,
 131   TARGET_SIGNAL_WINCH = 28,
 132   TARGET_SIGNAL_LOST = 29,
 133   TARGET_SIGNAL_USR1 = 30,
 134   TARGET_SIGNAL_USR2 = 31,
 135   TARGET_SIGNAL_PWR = 32,
 136   /* Similar to SIGIO.  Perhaps they should have the same number.  */
 137   TARGET_SIGNAL_POLL = 33,
 138   TARGET_SIGNAL_WIND = 34,
 139   TARGET_SIGNAL_PHONE = 35,
 140   TARGET_SIGNAL_WAITING = 36,
 141   TARGET_SIGNAL_LWP = 37,
 142   TARGET_SIGNAL_DANGER = 38,
 143   TARGET_SIGNAL_GRANT = 39,
 144   TARGET_SIGNAL_RETRACT = 40,
 145   TARGET_SIGNAL_MSG = 41,
 146   TARGET_SIGNAL_SOUND = 42,
 147   TARGET_SIGNAL_SAK = 43,
 148   TARGET_SIGNAL_PRIO = 44,
 149   TARGET_SIGNAL_REALTIME_33 = 45,
 150   TARGET_SIGNAL_REALTIME_34 = 46,
 151   TARGET_SIGNAL_REALTIME_35 = 47,
 152   TARGET_SIGNAL_REALTIME_36 = 48,
 153   TARGET_SIGNAL_REALTIME_37 = 49,
 154   TARGET_SIGNAL_REALTIME_38 = 50,
 155   TARGET_SIGNAL_REALTIME_39 = 51,
 156   TARGET_SIGNAL_REALTIME_40 = 52,
 157   TARGET_SIGNAL_REALTIME_41 = 53,
 158   TARGET_SIGNAL_REALTIME_42 = 54,
 159   TARGET_SIGNAL_REALTIME_43 = 55,
 160   TARGET_SIGNAL_REALTIME_44 = 56,
 161   TARGET_SIGNAL_REALTIME_45 = 57,
 162   TARGET_SIGNAL_REALTIME_46 = 58,
 163   TARGET_SIGNAL_REALTIME_47 = 59,
 164   TARGET_SIGNAL_REALTIME_48 = 60,
 165   TARGET_SIGNAL_REALTIME_49 = 61,
 166   TARGET_SIGNAL_REALTIME_50 = 62,
 167   TARGET_SIGNAL_REALTIME_51 = 63,
 168   TARGET_SIGNAL_REALTIME_52 = 64,
 169   TARGET_SIGNAL_REALTIME_53 = 65,
 170   TARGET_SIGNAL_REALTIME_54 = 66,
 171   TARGET_SIGNAL_REALTIME_55 = 67,
 172   TARGET_SIGNAL_REALTIME_56 = 68,
 173   TARGET_SIGNAL_REALTIME_57 = 69,
 174   TARGET_SIGNAL_REALTIME_58 = 70,
 175   TARGET_SIGNAL_REALTIME_59 = 71,
 176   TARGET_SIGNAL_REALTIME_60 = 72,
 177   TARGET_SIGNAL_REALTIME_61 = 73,
 178   TARGET_SIGNAL_REALTIME_62 = 74,
 179   TARGET_SIGNAL_REALTIME_63 = 75,
 180
 181   /* Mach exceptions */
 182   TARGET_EXC_BAD_ACCESS = 76,
 183   TARGET_EXC_BAD_INSTRUCTION = 77,
 184   TARGET_EXC_ARITHMETIC = 78,
 185   TARGET_EXC_EMULATION = 79,
 186   TARGET_EXC_SOFTWARE = 80,
 187   TARGET_EXC_BREAKPOINT = 81,
 188
 189   /* Some signal we don't know about.  */
 190   TARGET_SIGNAL_UNKNOWN,
 191
 192   /* Use whatever signal we use when one is not specifically specified
 193      (for passing to proceed and so on).  */
 194   TARGET_SIGNAL_DEFAULT,
 195
 196   /* Last and unused enum value, for sizing arrays, etc.  */
 197   TARGET_SIGNAL_LAST
 198 };
 199
 200 struct target_waitstatus {
 201   enum target_waitkind kind;
 202
 203   /* Exit status or signal number.  */
 204   union {
 205     int integer;
 206     enum target_signal sig;
 207   } value;
 208 };
 209
 210 /* Return the string for a signal.  */
 211 extern char *target_signal_to_string PARAMS ((enum target_signal));
 212
 213 /* Return the name (SIGHUP, etc.) for a signal.  */
 214 extern char *target_signal_to_name PARAMS ((enum target_signal));
 215
 216 /* Given a name (SIGHUP, etc.), return its signal.  */
 217 enum target_signal target_signal_from_name PARAMS ((char *));
 218 \f
 219 /* If certain kinds of activity happen, target_wait should perform
 220    callbacks.  */
 221 /* Right now we just call (*TARGET_ACTIVITY_FUNCTION) if I/O is possible
 222    on TARGET_ACTIVITY_FD.   */
 223 extern int target_activity_fd;
 224 /* Returns zero to leave the inferior alone, one to interrupt it.  */
 225 extern int (*target_activity_function) PARAMS ((void));
 226 \f
 227 struct target_ops
 228 {
 229   char         *to_shortname;   /* Name this target type */
 230   char         *to_longname;    /* Name for printing */
 231   char         *to_doc;         /* Documentation.  Does not include trailing
 232                                    newline, and starts with a one-line descrip-
 233                                    tion (probably similar to to_longname). */
 234   void        (*to_open) PARAMS ((char *, int));
 235   void        (*to_close) PARAMS ((int));
 236   void        (*to_attach) PARAMS ((char *, int));
 237   void        (*to_detach) PARAMS ((char *, int));
 238   void        (*to_resume) PARAMS ((int, int, enum target_signal));
 239   int         (*to_wait) PARAMS ((int, struct target_waitstatus *));
 240   void        (*to_fetch_registers) PARAMS ((int));
 241   void        (*to_store_registers) PARAMS ((int));
 242   void        (*to_prepare_to_store) PARAMS ((void));
 243
 244   /* Transfer LEN bytes of memory between GDB address MYADDR and
 245      target address MEMADDR.  If WRITE, transfer them to the target, else
 246      transfer them from the target.  TARGET is the target from which we
 247      get this function.
 248
 249      Return value, N, is one of the following:
 250
 251      0 means that we can't handle this.  If errno has been set, it is the
 252      error which prevented us from doing it (FIXME: What about bfd_error?).
 253
 254      positive (call it N) means that we have transferred N bytes
 255      starting at MEMADDR.  We might be able to handle more bytes
 256      beyond this length, but no promises.
 257
 258      negative (call its absolute value N) means that we cannot
 259      transfer right at MEMADDR, but we could transfer at least
 260      something at MEMADDR + N.  */
 261
 262   int         (*to_xfer_memory) PARAMS ((CORE_ADDR memaddr, char *myaddr,
 263                                          int len, int write,
 264                                          struct target_ops * target));
 265
 266 #if 0
 267   /* Enable this after 4.12.  */
 268
 269   /* Search target memory.  Start at STARTADDR and take LEN bytes of
 270      target memory, and them with MASK, and compare to DATA.  If they
 271      match, set *ADDR_FOUND to the address we found it at, store the data
 272      we found at LEN bytes starting at DATA_FOUND, and return.  If
 273      not, add INCREMENT to the search address and keep trying until
 274      the search address is outside of the range [LORANGE,HIRANGE).
 275
 276      If we don't find anything, set *ADDR_FOUND to (CORE_ADDR)0 and return.  */
 277   void (*to_search) PARAMS ((int len, char *data, char *mask,
 278                              CORE_ADDR startaddr, int increment,
 279                              CORE_ADDR lorange, CORE_ADDR hirange,
 280                              CORE_ADDR *addr_found, char *data_found));
 281
 282 #define target_search(len, data, mask, startaddr, increment, lorange, hirange, addr_found, data_found)  \
 283   (*current_target.to_search) (len, data, mask, startaddr, increment, \
 284                                 lorange, hirange, addr_found, data_found)
 285 #endif /* 0 */
 286
 287   void        (*to_files_info) PARAMS ((struct target_ops *));
 288   int         (*to_insert_breakpoint) PARAMS ((CORE_ADDR, char *));
 289   int         (*to_remove_breakpoint) PARAMS ((CORE_ADDR, char *));
 290   void        (*to_terminal_init) PARAMS ((void));
 291   void        (*to_terminal_inferior) PARAMS ((void));
 292   void        (*to_terminal_ours_for_output) PARAMS ((void));
 293   void        (*to_terminal_ours) PARAMS ((void));
 294   void        (*to_terminal_info) PARAMS ((char *, int));
 295   void        (*to_kill) PARAMS ((void));
 296   void        (*to_load) PARAMS ((char *, int));
 297   int         (*to_lookup_symbol) PARAMS ((char *, CORE_ADDR *));
 298   void        (*to_create_inferior) PARAMS ((char *, char *, char **));
 299   void        (*to_mourn_inferior) PARAMS ((void));
 300   int         (*to_can_run) PARAMS ((void));
 301   void        (*to_notice_signals) PARAMS ((int pid));
 302   int         (*to_thread_alive) PARAMS ((int pid));
 303   void        (*to_stop) PARAMS ((void));
 304   enum strata   to_stratum;
 305   struct target_ops
 306                 *DONT_USE;      /* formerly to_next */
 307   int           to_has_all_memory;
 308   int           to_has_memory;
 309   int           to_has_stack;
 310   int           to_has_registers;
 311   int           to_has_execution;
 312   struct section_table
 313                *to_sections;
 314   struct section_table
 315                *to_sections_end;
 316   int           to_magic;
 317   /* Need sub-structure for target machine related rather than comm related? */
 318 };
 319
 320 /* Magic number for checking ops size.  If a struct doesn't end with this
 321    number, somebody changed the declaration but didn't change all the
 322    places that initialize one.  */
 323
 324 #define OPS_MAGIC       3840
 325
 326 /* The ops structure for our "current" target process.  This should
 327    never be NULL.  If there is no target, it points to the dummy_target.  */
 328
 329 extern struct target_ops        current_target;
 330
 331 /* An item on the target stack.  */
 332
 333 struct target_stack_item
 334 {
 335   struct target_stack_item *next;
 336   struct target_ops *target_ops;
 337 };
 338
 339 /* The target stack.  */
 340
 341 extern struct target_stack_item *target_stack;
 342
 343 /* Define easy words for doing these operations on our current target.  */
 344
 345 #define target_shortname        (current_target.to_shortname)
 346 #define target_longname         (current_target.to_longname)
 347
 348 /* The open routine takes the rest of the parameters from the command,
 349    and (if successful) pushes a new target onto the stack.
 350    Targets should supply this routine, if only to provide an error message.  */
 351 #define target_open(name, from_tty)     \
 352         (*current_target.to_open) (name, from_tty)
 353
 354 /* Does whatever cleanup is required for a target that we are no longer
 355    going to be calling.  Argument says whether we are quitting gdb and
 356    should not get hung in case of errors, or whether we want a clean
 357    termination even if it takes a while.  This routine is automatically
 358    always called just before a routine is popped off the target stack.
 359    Closing file descriptors and freeing memory are typical things it should
 360    do.  */
 361
 362 #define target_close(quitting)  \
 363         (*current_target.to_close) (quitting)
 364
 365 /* Attaches to a process on the target side.  Arguments are as passed
 366    to the `attach' command by the user.  This routine can be called
 367    when the target is not on the target-stack, if the target_can_run
 368    routine returns 1; in that case, it must push itself onto the stack.
 369    Upon exit, the target should be ready for normal operations, and
 370    should be ready to deliver the status of the process immediately
 371    (without waiting) to an upcoming target_wait call.  */
 372
 373 #define target_attach(args, from_tty)   \
 374         (*current_target.to_attach) (args, from_tty)
 375
 376 /* Takes a program previously attached to and detaches it.
 377    The program may resume execution (some targets do, some don't) and will
 378    no longer stop on signals, etc.  We better not have left any breakpoints
 379    in the program or it'll die when it hits one.  ARGS is arguments
 380    typed by the user (e.g. a signal to send the process).  FROM_TTY
 381    says whether to be verbose or not.  */
 382
 383 extern void
 384 target_detach PARAMS ((char *, int));
 385
 386 /* Resume execution of the target process PID.  STEP says whether to
 387    single-step or to run free; SIGGNAL is the signal to be given to
 388    the target, or TARGET_SIGNAL_0 for no signal.  The caller may not
 389    pass TARGET_SIGNAL_DEFAULT.  */
 390
 391 #define target_resume(pid, step, siggnal)       \
 392         (*current_target.to_resume) (pid, step, siggnal)
 393
 394 /* Wait for process pid to do something.  Pid = -1 to wait for any pid
 395    to do something.  Return pid of child, or -1 in case of error;
 396    store status through argument pointer STATUS.  Note that it is
 397    *not* OK to return_to_top_level out of target_wait without popping
 398    the debugging target from the stack; GDB isn't prepared to get back
 399    to the prompt with a debugging target but without the frame cache,
 400    stop_pc, etc., set up.  */
 401
 402 #define target_wait(pid, status)                \
 403         (*current_target.to_wait) (pid, status)
 404
 405 /* Fetch register REGNO, or all regs if regno == -1.  No result.  */
 406
 407 #define target_fetch_registers(regno)   \
 408         (*current_target.to_fetch_registers) (regno)
 409
 410 /* Store at least register REGNO, or all regs if REGNO == -1.
 411    It can store as many registers as it wants to, so target_prepare_to_store
 412    must have been previously called.  Calls error() if there are problems.  */
 413
 414 #define target_store_registers(regs)    \
 415         (*current_target.to_store_registers) (regs)
 416
 417 /* Get ready to modify the registers array.  On machines which store
 418    individual registers, this doesn't need to do anything.  On machines
 419    which store all the registers in one fell swoop, this makes sure
 420    that REGISTERS contains all the registers from the program being
 421    debugged.  */
 422
 423 #define target_prepare_to_store()       \
 424         (*current_target.to_prepare_to_store) ()
 425
 426 extern int target_read_string PARAMS ((CORE_ADDR, char **, int, int *));
 427
 428 extern int
 429 target_read_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, int len));
 430
 431 extern int
 432 target_read_memory_section PARAMS ((CORE_ADDR memaddr, char *myaddr, int len,
 433                                     asection *bfd_section));
 434
 435 extern int
 436 target_read_memory_partial PARAMS ((CORE_ADDR, char *, int, int *));
 437
 438 extern int
 439 target_write_memory PARAMS ((CORE_ADDR, char *, int));
 440
 441 extern int
 442 xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
 443
 444 extern int
 445 child_xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
 446
 447 /* From exec.c */
 448
 449 extern void
 450 print_section_info PARAMS ((struct target_ops *, bfd *));
 451
 452 /* Print a line about the current target.  */
 453
 454 #define target_files_info()     \
 455         (*current_target.to_files_info) (&current_target)
 456
 457 /* Insert a breakpoint at address ADDR in the target machine.
 458    SAVE is a pointer to memory allocated for saving the
 459    target contents.  It is guaranteed by the caller to be long enough
 460    to save "sizeof BREAKPOINT" bytes.  Result is 0 for success, or
 461    an errno value.  */
 462
 463 #define target_insert_breakpoint(addr, save)    \
 464         (*current_target.to_insert_breakpoint) (addr, save)
 465
 466 /* Remove a breakpoint at address ADDR in the target machine.
 467    SAVE is a pointer to the same save area
 468    that was previously passed to target_insert_breakpoint.
 469    Result is 0 for success, or an errno value.  */
 470
 471 #define target_remove_breakpoint(addr, save)    \
 472         (*current_target.to_remove_breakpoint) (addr, save)
 473
 474 /* Initialize the terminal settings we record for the inferior,
 475    before we actually run the inferior.  */
 476
 477 #define target_terminal_init() \
 478         (*current_target.to_terminal_init) ()
 479
 480 /* Put the inferior's terminal settings into effect.
 481    This is preparation for starting or resuming the inferior.  */
 482
 483 #define target_terminal_inferior() \
 484         (*current_target.to_terminal_inferior) ()
 485
 486 /* Put some of our terminal settings into effect,
 487    enough to get proper results from our output,
 488    but do not change into or out of RAW mode
 489    so that no input is discarded.
 490
 491    After doing this, either terminal_ours or terminal_inferior
 492    should be called to get back to a normal state of affairs.  */
 493
 494 #define target_terminal_ours_for_output() \
 495         (*current_target.to_terminal_ours_for_output) ()
 496
 497 /* Put our terminal settings into effect.
 498    First record the inferior's terminal settings
 499    so they can be restored properly later.  */
 500
 501 #define target_terminal_ours() \
 502         (*current_target.to_terminal_ours) ()
 503
 504 /* Print useful information about our terminal status, if such a thing
 505    exists.  */
 506
 507 #define target_terminal_info(arg, from_tty) \
 508         (*current_target.to_terminal_info) (arg, from_tty)
 509
 510 /* Kill the inferior process.   Make it go away.  */
 511
 512 #define target_kill() \
 513         (*current_target.to_kill) ()
 514
 515 /* Load an executable file into the target process.  This is expected to
 516    not only bring new code into the target process, but also to update
 517    GDB's symbol tables to match.  */
 518
 519 #define target_load(arg, from_tty) \
 520         (*current_target.to_load) (arg, from_tty)
 521
 522 /* Look up a symbol in the target's symbol table.  NAME is the symbol
 523    name.  ADDRP is a CORE_ADDR * pointing to where the value of the symbol
 524    should be returned.  The result is 0 if successful, nonzero if the
 525    symbol does not exist in the target environment.  This function should
 526    not call error() if communication with the target is interrupted, since
 527    it is called from symbol reading, but should return nonzero, possibly
 528    doing a complain().  */
 529
 530 #define target_lookup_symbol(name, addrp)       \
 531   (*current_target.to_lookup_symbol) (name, addrp)
 532
 533 /* Start an inferior process and set inferior_pid to its pid.
 534    EXEC_FILE is the file to run.
 535    ALLARGS is a string containing the arguments to the program.
 536    ENV is the environment vector to pass.  Errors reported with error().
 537    On VxWorks and various standalone systems, we ignore exec_file.  */
 538
 539 #define target_create_inferior(exec_file, args, env)    \
 540         (*current_target.to_create_inferior) (exec_file, args, env)
 541
 542 /* The inferior process has died.  Do what is right.  */
 543
 544 #define target_mourn_inferior() \
 545         (*current_target.to_mourn_inferior) ()
 546
 547 /* Does target have enough data to do a run or attach command? */
 548
 549 #define target_can_run(t) \
 550         ((t)->to_can_run) ()
 551
 552 /* post process changes to signal handling in the inferior.  */
 553
 554 #define target_notice_signals(pid) \
 555         (*current_target.to_notice_signals) (pid)
 556
 557 /* Check to see if a thread is still alive.  */
 558
 559 #define target_thread_alive(pid) \
 560         (*current_target.to_thread_alive) (pid)
 561
 562 /* Make target stop in a continuable fashion.  (For instance, under Unix, this
 563    should act like SIGSTOP).  This function is normally used by GUIs to
 564    implement a stop button.  */
 565
 566 #define target_stop() current_target.to_stop ()
 567
 568 /* Pointer to next target in the chain, e.g. a core file and an exec file.  */
 569
 570 #define target_next \
 571         (current_target.to_next)
 572
 573 /* Does the target include all of memory, or only part of it?  This
 574    determines whether we look up the target chain for other parts of
 575    memory if this target can't satisfy a request.  */
 576
 577 #define target_has_all_memory   \
 578         (current_target.to_has_all_memory)
 579
 580 /* Does the target include memory?  (Dummy targets don't.)  */
 581
 582 #define target_has_memory       \
 583         (current_target.to_has_memory)
 584
 585 /* Does the target have a stack?  (Exec files don't, VxWorks doesn't, until
 586    we start a process.)  */
 587
 588 #define target_has_stack        \
 589         (current_target.to_has_stack)
 590
 591 /* Does the target have registers?  (Exec files don't.)  */
 592
 593 #define target_has_registers    \
 594         (current_target.to_has_registers)
 595
 596 /* Does the target have execution?  Can we make it jump (through
 597    hoops), or pop its stack a few times?  FIXME: If this is to work that
 598    way, it needs to check whether an inferior actually exists.
 599    remote-udi.c and probably other targets can be the current target
 600    when the inferior doesn't actually exist at the moment.  Right now
 601    this just tells us whether this target is *capable* of execution.  */
 602
 603 #define target_has_execution    \
 604         (current_target.to_has_execution)
 605
 606 extern void target_link PARAMS ((char *, CORE_ADDR *));
 607
 608 /* Converts a process id to a string.  Usually, the string just contains
 609    `process xyz', but on some systems it may contain
 610    `process xyz thread abc'.  */
 611
 612 #ifndef target_pid_to_str
 613 #define target_pid_to_str(PID) \
 614         normal_pid_to_str (PID)
 615 extern char *normal_pid_to_str PARAMS ((int pid));
 616 #endif
 617
 618 #ifndef target_new_objfile
 619 #define target_new_objfile(OBJFILE)
 620 #endif
 621
 622 /* Hook to call target-dependant code after reading in a new symbol table. */
 623
 624 #ifndef TARGET_SYMFILE_POSTREAD
 625 #define TARGET_SYMFILE_POSTREAD(OBJFILE)
 626 #endif
 627
 628 /* Hook to call target dependant code just after inferior target process has
 629    started.  */
 630
 631 #ifndef TARGET_CREATE_INFERIOR_HOOK
 632 #define TARGET_CREATE_INFERIOR_HOOK(PID)
 633 #endif
 634
 635 /* Hardware watchpoint interfaces.  */
 636
 637 /* Returns non-zero if we were stopped by a hardware watchpoint (memory read or
 638    write).  */
 639
 640 #ifndef STOPPED_BY_WATCHPOINT
 641 #define STOPPED_BY_WATCHPOINT(w) 0
 642 #endif
 643
 644 /* Provide defaults for systems that don't support hardware watchpoints. */
 645
 646 #ifndef TARGET_HAS_HARDWARE_WATCHPOINTS
 647
 648 /* Returns non-zero if we can set a hardware watchpoint of type TYPE.  TYPE is
 649    one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint, or
 650    bp_hardware_breakpoint.  CNT is the number of such watchpoints used so far
 651    (including this one?).  OTHERTYPE is who knows what...  */
 652
 653 #define TARGET_CAN_USE_HARDWARE_WATCHPOINT(TYPE,CNT,OTHERTYPE) 0
 654
 655 /* Set/clear a hardware watchpoint starting at ADDR, for LEN bytes.  TYPE is 0
 656    for write, 1 for read, and 2 for read/write accesses.  Returns 0 for
 657    success, non-zero for failure.  */
 658
 659 #define target_remove_watchpoint(ADDR,LEN,TYPE) -1
 660 #define target_insert_watchpoint(ADDR,LEN,TYPE) -1
 661
 662 #endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */
 663
 664 #ifndef target_insert_hw_breakpoint
 665 #define target_remove_hw_breakpoint(ADDR,SHADOW) -1
 666 #define target_insert_hw_breakpoint(ADDR,SHADOW) -1
 667 #endif
 668
 669 #ifndef target_stopped_data_address
 670 #define target_stopped_data_address() 0
 671 #endif
 672
 673 /* If defined, then we need to decr pc by this much after a hardware break-
 674    point.  Presumably this overrides DECR_PC_AFTER_BREAK...  */
 675
 676 #ifndef DECR_PC_AFTER_HW_BREAK
 677 #define DECR_PC_AFTER_HW_BREAK 0
 678 #endif
 679
 680 /* Routines for maintenance of the target structures...
 681
 682    add_target:   Add a target to the list of all possible targets.
 683
 684    push_target:  Make this target the top of the stack of currently used
 685                  targets, within its particular stratum of the stack.  Result
 686                  is 0 if now atop the stack, nonzero if not on top (maybe
 687                  should warn user).
 688
 689    unpush_target: Remove this from the stack of currently used targets,
 690                  no matter where it is on the list.  Returns 0 if no
 691                  change, 1 if removed from stack.
 692
 693    pop_target:   Remove the top thing on the stack of current targets.  */
 694
 695 extern void
 696 add_target PARAMS ((struct target_ops *));
 697
 698 extern int
 699 push_target PARAMS ((struct target_ops *));
 700
 701 extern int
 702 unpush_target PARAMS ((struct target_ops *));
 703
 704 extern void
 705 target_preopen PARAMS ((int));
 706
 707 extern void
 708 pop_target PARAMS ((void));
 709
 710 /* Struct section_table maps address ranges to file sections.  It is
 711    mostly used with BFD files, but can be used without (e.g. for handling
 712    raw disks, or files not in formats handled by BFD).  */
 713
 714 struct section_table {
 715   CORE_ADDR addr;               /* Lowest address in section */
 716   CORE_ADDR endaddr;            /* 1+highest address in section */
 717
 718   sec_ptr the_bfd_section;
 719
 720   bfd      *bfd;                /* BFD file pointer */
 721 };
 722
 723 /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
 724    Returns 0 if OK, 1 on error.  */
 725
 726 extern int
 727 build_section_table PARAMS ((bfd *, struct section_table **,
 728                              struct section_table **));
 729
 730 /* From mem-break.c */
 731
 732 extern int
 733 memory_remove_breakpoint PARAMS ((CORE_ADDR, char *));
 734
 735 extern int
 736 memory_insert_breakpoint PARAMS ((CORE_ADDR, char *));
 737
 738 unsigned char *
 739 memory_breakpoint_from_pc PARAMS ((CORE_ADDR *pcptr, int *lenptr));
 740
 741 /* From target.c */
 742
 743 extern void
 744 initialize_targets PARAMS ((void));
 745
 746 extern void
 747 noprocess PARAMS ((void));
 748
 749 extern void
 750 find_default_attach PARAMS ((char *, int));
 751
 752 extern void
 753 find_default_create_inferior PARAMS ((char *, char *, char **));
 754
 755 extern struct target_ops *
 756 find_core_target PARAMS ((void));
 757 \f
 758 /* Stuff that should be shared among the various remote targets.  */
 759
 760 /* Debugging level.  0 is off, and non-zero values mean to print some debug
 761    information (higher values, more information).  */
 762 extern int remote_debug;
 763
 764 /* Speed in bits per second, or -1 which means don't mess with the speed.  */
 765 extern int baud_rate;
 766 /* Timeout limit for response from target. */
 767 extern int remote_timeout;
 768
 769 extern asection *target_memory_bfd_section;
 770 \f
 771 /* Functions for helping to write a native target.  */
 772
 773 /* This is for native targets which use a unix/POSIX-style waitstatus.  */
 774 extern void store_waitstatus PARAMS ((struct target_waitstatus *, int));
 775
 776 /* Convert between host signal numbers and enum target_signal's.  */
 777 extern enum target_signal target_signal_from_host PARAMS ((int));
 778 extern int target_signal_to_host PARAMS ((enum target_signal));
 779
 780 /* Convert from a number used in a GDB command to an enum target_signal.  */
 781 extern enum target_signal target_signal_from_command PARAMS ((int));
 782
 783 /* Any target can call this to switch to remote protocol (in remote.c). */
 784 extern void push_remote_target PARAMS ((char *name, int from_tty));
 785 \f
 786 /* Imported from machine dependent code */
 787
 788 #ifdef NO_SINGLE_STEP
 789 extern int one_stepped;
 790 extern void  single_step PARAMS ((enum target_signal));
 791 #endif /* NO_SINGLE_STEP */
 792
 793 #endif  /* !defined (TARGET_H) */