gdb/arch-utils.c

   1 /* Dynamic architecture support for GDB, the GNU debugger.
   2
   3    Copyright 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation,
   4    Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #include "defs.h"
  24
  25 #if GDB_MULTI_ARCH
  26 #include "arch-utils.h"
  27 #include "gdbcmd.h"
  28 #include "inferior.h"           /* enum CALL_DUMMY_LOCATION et.al. */
  29 #else
  30 /* Just include everything in sight so that the every old definition
  31    of macro is visible. */
  32 #include "symtab.h"
  33 #include "frame.h"
  34 #include "inferior.h"
  35 #include "breakpoint.h"
  36 #include "gdb_wait.h"
  37 #include "gdbcore.h"
  38 #include "gdbcmd.h"
  39 #include "target.h"
  40 #include "annotate.h"
  41 #endif
  42 #include "gdb_string.h"
  43 #include "regcache.h"
  44 #include "gdb_assert.h"
  45 #include "sim-regno.h"
  46
  47 #include "version.h"
  48
  49 #include "floatformat.h"
  50
  51 /* Implementation of extract return value that grubs around in the
  52    register cache.  */
  53 void
  54 legacy_extract_return_value (struct type *type, struct regcache *regcache,
  55                              void *valbuf)
  56 {
  57   char *registers = deprecated_grub_regcache_for_registers (regcache);
  58   bfd_byte *buf = valbuf;
  59   DEPRECATED_EXTRACT_RETURN_VALUE (type, registers, buf); /* OK */
  60 }
  61
  62 /* Implementation of store return value that grubs the register cache.
  63    Takes a local copy of the buffer to avoid const problems.  */
  64 void
  65 legacy_store_return_value (struct type *type, struct regcache *regcache,
  66                            const void *buf)
  67 {
  68   bfd_byte *b = alloca (TYPE_LENGTH (type));
  69   gdb_assert (regcache == current_regcache);
  70   memcpy (b, buf, TYPE_LENGTH (type));
  71   DEPRECATED_STORE_RETURN_VALUE (type, b);
  72 }
  73
  74
  75 int
  76 legacy_register_sim_regno (int regnum)
  77 {
  78   /* Only makes sense to supply raw registers.  */
  79   gdb_assert (regnum >= 0 && regnum < NUM_REGS);
  80   /* NOTE: cagney/2002-05-13: The old code did it this way and it is
  81      suspected that some GDB/SIM combinations may rely on this
  82      behavour.  The default should be one2one_register_sim_regno
  83      (below).  */
  84   if (REGISTER_NAME (regnum) != NULL
  85       && REGISTER_NAME (regnum)[0] != '\0')
  86     return regnum;
  87   else
  88     return LEGACY_SIM_REGNO_IGNORE;
  89 }
  90
  91 int
  92 generic_frameless_function_invocation_not (struct frame_info *fi)
  93 {
  94   return 0;
  95 }
  96
  97 int
  98 generic_return_value_on_stack_not (struct type *type)
  99 {
 100   return 0;
 101 }
 102
 103 CORE_ADDR
 104 generic_skip_trampoline_code (CORE_ADDR pc)
 105 {
 106   return 0;
 107 }
 108
 109 int
 110 generic_in_solib_call_trampoline (CORE_ADDR pc, char *name)
 111 {
 112   return 0;
 113 }
 114
 115 int
 116 generic_in_solib_return_trampoline (CORE_ADDR pc, char *name)
 117 {
 118   return 0;
 119 }
 120
 121 int
 122 generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
 123 {
 124   return 0;
 125 }
 126
 127 const char *
 128 legacy_register_name (int i)
 129 {
 130 #ifdef REGISTER_NAMES
 131   static char *names[] = REGISTER_NAMES;
 132   if (i < 0 || i >= (sizeof (names) / sizeof (*names)))
 133     return NULL;
 134   else
 135     return names[i];
 136 #else
 137   internal_error (__FILE__, __LINE__,
 138                   "legacy_register_name: called.");
 139   return NULL;
 140 #endif
 141 }
 142
 143 #if defined (CALL_DUMMY)
 144 LONGEST legacy_call_dummy_words[] = CALL_DUMMY;
 145 #else
 146 LONGEST legacy_call_dummy_words[1];
 147 #endif
 148 int legacy_sizeof_call_dummy_words = sizeof (legacy_call_dummy_words);
 149
 150 void
 151 generic_remote_translate_xfer_address (struct gdbarch *gdbarch,
 152                                        struct regcache *regcache,
 153                                        CORE_ADDR gdb_addr, int gdb_len,
 154                                        CORE_ADDR * rem_addr, int *rem_len)
 155 {
 156   *rem_addr = gdb_addr;
 157   *rem_len = gdb_len;
 158 }
 159
 160 int
 161 generic_prologue_frameless_p (CORE_ADDR ip)
 162 {
 163   return ip == SKIP_PROLOGUE (ip);
 164 }
 165
 166 /* New/multi-arched targets should use the correct gdbarch field
 167    instead of using this global pointer. */
 168 int
 169 legacy_print_insn (bfd_vma vma, disassemble_info *info)
 170 {
 171   return (*deprecated_tm_print_insn) (vma, info);
 172 }
 173
 174 /* Helper functions for INNER_THAN */
 175
 176 int
 177 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
 178 {
 179   return (lhs < rhs);
 180 }
 181
 182 int
 183 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
 184 {
 185   return (lhs > rhs);
 186 }
 187
 188
 189 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
 190
 191 const struct floatformat *
 192 default_float_format (struct gdbarch *gdbarch)
 193 {
 194 #if GDB_MULTI_ARCH
 195   int byte_order = gdbarch_byte_order (gdbarch);
 196 #else
 197   int byte_order = TARGET_BYTE_ORDER;
 198 #endif
 199   switch (byte_order)
 200     {
 201     case BFD_ENDIAN_BIG:
 202       return &floatformat_ieee_single_big;
 203     case BFD_ENDIAN_LITTLE:
 204       return &floatformat_ieee_single_little;
 205     default:
 206       internal_error (__FILE__, __LINE__,
 207                       "default_float_format: bad byte order");
 208     }
 209 }
 210
 211
 212 const struct floatformat *
 213 default_double_format (struct gdbarch *gdbarch)
 214 {
 215 #if GDB_MULTI_ARCH
 216   int byte_order = gdbarch_byte_order (gdbarch);
 217 #else
 218   int byte_order = TARGET_BYTE_ORDER;
 219 #endif
 220   switch (byte_order)
 221     {
 222     case BFD_ENDIAN_BIG:
 223       return &floatformat_ieee_double_big;
 224     case BFD_ENDIAN_LITTLE:
 225       return &floatformat_ieee_double_little;
 226     default:
 227       internal_error (__FILE__, __LINE__,
 228                       "default_double_format: bad byte order");
 229     }
 230 }
 231
 232 /* Misc helper functions for targets. */
 233
 234 int
 235 frame_num_args_unknown (struct frame_info *fi)
 236 {
 237   return -1;
 238 }
 239
 240
 241 int
 242 generic_register_convertible_not (int num)
 243 {
 244   return 0;
 245 }
 246
 247
 248 /* Under some ABI's that specify the `struct convention' for returning
 249    structures by value, by the time we've returned from the function,
 250    the return value is sitting there in the caller's buffer, but GDB
 251    has no way to find the address of that buffer.
 252
 253    On such architectures, use this function as your
 254    extract_struct_value_address method.  When asked to a struct
 255    returned by value in this fashion, GDB will print a nice error
 256    message, instead of garbage.  */
 257 CORE_ADDR
 258 generic_cannot_extract_struct_value_address (char *dummy)
 259 {
 260   return 0;
 261 }
 262
 263 CORE_ADDR
 264 core_addr_identity (CORE_ADDR addr)
 265 {
 266   return addr;
 267 }
 268
 269 int
 270 no_op_reg_to_regnum (int reg)
 271 {
 272   return reg;
 273 }
 274
 275 /* Default prepare_to_procced().  */
 276 int
 277 default_prepare_to_proceed (int select_it)
 278 {
 279   return 0;
 280 }
 281
 282 /* Generic prepare_to_proceed().  This one should be suitable for most
 283    targets that support threads. */
 284 int
 285 generic_prepare_to_proceed (int select_it)
 286 {
 287   ptid_t wait_ptid;
 288   struct target_waitstatus wait_status;
 289
 290   /* Get the last target status returned by target_wait().  */
 291   get_last_target_status (&wait_ptid, &wait_status);
 292
 293   /* Make sure we were stopped either at a breakpoint, or because
 294      of a Ctrl-C.  */
 295   if (wait_status.kind != TARGET_WAITKIND_STOPPED
 296       || (wait_status.value.sig != TARGET_SIGNAL_TRAP &&
 297           wait_status.value.sig != TARGET_SIGNAL_INT))
 298     {
 299       return 0;
 300     }
 301
 302   if (!ptid_equal (wait_ptid, minus_one_ptid)
 303       && !ptid_equal (inferior_ptid, wait_ptid))
 304     {
 305       /* Switched over from WAIT_PID.  */
 306       CORE_ADDR wait_pc = read_pc_pid (wait_ptid);
 307
 308       if (wait_pc != read_pc ())
 309         {
 310           if (select_it)
 311             {
 312               /* Switch back to WAIT_PID thread.  */
 313               inferior_ptid = wait_ptid;
 314
 315               /* FIXME: This stuff came from switch_to_thread() in
 316                  thread.c (which should probably be a public function).  */
 317               flush_cached_frames ();
 318               registers_changed ();
 319               stop_pc = wait_pc;
 320               select_frame (get_current_frame ());
 321             }
 322           /* We return 1 to indicate that there is a breakpoint here,
 323              so we need to step over it before continuing to avoid
 324              hitting it straight away. */
 325           if (breakpoint_here_p (wait_pc))
 326             {
 327               return 1;
 328             }
 329         }
 330     }
 331   return 0;
 332
 333 }
 334
 335 CORE_ADDR
 336 init_frame_pc_noop (int fromleaf, struct frame_info *prev)
 337 {
 338   /* Do nothing, implies return the same PC value.  */
 339   return get_frame_pc (prev);
 340 }
 341
 342 CORE_ADDR
 343 init_frame_pc_default (int fromleaf, struct frame_info *prev)
 344 {
 345   if (fromleaf && DEPRECATED_SAVED_PC_AFTER_CALL_P ())
 346     return DEPRECATED_SAVED_PC_AFTER_CALL (get_next_frame (prev));
 347   else if (get_next_frame (prev) != NULL)
 348     return DEPRECATED_FRAME_SAVED_PC (get_next_frame (prev));
 349   else
 350     return read_pc ();
 351 }
 352
 353 void
 354 default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
 355 {
 356   return;
 357 }
 358
 359 void
 360 default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
 361 {
 362   return;
 363 }
 364
 365 int
 366 cannot_register_not (int regnum)
 367 {
 368   return 0;
 369 }
 370
 371 /* Legacy version of target_virtual_frame_pointer().  Assumes that
 372    there is an DEPRECATED_FP_REGNUM and that it is the same, cooked or
 373    raw.  */
 374
 375 void
 376 legacy_virtual_frame_pointer (CORE_ADDR pc,
 377                               int *frame_regnum,
 378                               LONGEST *frame_offset)
 379 {
 380   /* FIXME: cagney/2002-09-13: This code is used when identifying the
 381      frame pointer of the current PC.  It is assuming that a single
 382      register and an offset can determine this.  I think it should
 383      instead generate a byte code expression as that would work better
 384      with things like Dwarf2's CFI.  */
 385   if (DEPRECATED_FP_REGNUM >= 0 && DEPRECATED_FP_REGNUM < NUM_REGS)
 386     *frame_regnum = DEPRECATED_FP_REGNUM;
 387   else if (SP_REGNUM >= 0 && SP_REGNUM < NUM_REGS)
 388     *frame_regnum = SP_REGNUM;
 389   else
 390     /* Should this be an internal error?  I guess so, it is reflecting
 391        an architectural limitation in the current design.  */
 392     internal_error (__FILE__, __LINE__, "No virtual frame pointer available");
 393   *frame_offset = 0;
 394 }
 395
 396 /* Assume the world is sane, every register's virtual and real size
 397    is identical.  */
 398
 399 int
 400 generic_register_size (int regnum)
 401 {
 402   gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
 403   if (gdbarch_register_type_p (current_gdbarch))
 404     return TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum));
 405   else
 406     /* FIXME: cagney/2003-03-01: Once all architectures implement
 407        gdbarch_register_type(), this entire function can go away.  It
 408        is made obsolete by register_size().  */
 409     return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (regnum)); /* OK */
 410 }
 411
 412 /* Assume all registers are adjacent.  */
 413
 414 int
 415 generic_register_byte (int regnum)
 416 {
 417   int byte;
 418   int i;
 419   gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
 420   byte = 0;
 421   for (i = 0; i < regnum; i++)
 422     {
 423       byte += generic_register_size (i);
 424     }
 425   return byte;
 426 }
 427
 428 \f
 429 int
 430 legacy_pc_in_sigtramp (CORE_ADDR pc, char *name)
 431 {
 432 #if !defined (IN_SIGTRAMP)
 433   if (SIGTRAMP_START_P ())
 434     return (pc) >= SIGTRAMP_START (pc) && (pc) < SIGTRAMP_END (pc);
 435   else
 436     return name && strcmp ("_sigtramp", name) == 0;
 437 #else
 438   return IN_SIGTRAMP (pc, name);
 439 #endif
 440 }
 441
 442 int
 443 legacy_convert_register_p (int regnum)
 444 {
 445   return REGISTER_CONVERTIBLE (regnum);
 446 }
 447
 448 void
 449 legacy_register_to_value (int regnum, struct type *type,
 450                           char *from, char *to)
 451 {
 452   REGISTER_CONVERT_TO_VIRTUAL (regnum, type, from, to);
 453 }
 454
 455 void
 456 legacy_value_to_register (struct type *type, int regnum,
 457                           char *from, char *to)
 458 {
 459   REGISTER_CONVERT_TO_RAW (type, regnum, from, to);
 460 }
 461
 462 \f
 463 /* Functions to manipulate the endianness of the target.  */
 464
 465 /* ``target_byte_order'' is only used when non- multi-arch.
 466    Multi-arch targets obtain the current byte order using the
 467    TARGET_BYTE_ORDER gdbarch method.
 468
 469    The choice of initial value is entirely arbitrary.  During startup,
 470    the function initialize_current_architecture() updates this value
 471    based on default byte-order information extracted from BFD.  */
 472 int target_byte_order = BFD_ENDIAN_BIG;
 473 int target_byte_order_auto = 1;
 474
 475 static const char endian_big[] = "big";
 476 static const char endian_little[] = "little";
 477 static const char endian_auto[] = "auto";
 478 static const char *endian_enum[] =
 479 {
 480   endian_big,
 481   endian_little,
 482   endian_auto,
 483   NULL,
 484 };
 485 static const char *set_endian_string;
 486
 487 /* Called by ``show endian''.  */
 488
 489 static void
 490 show_endian (char *args, int from_tty)
 491 {
 492   if (TARGET_BYTE_ORDER_AUTO)
 493     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 494                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 495   else
 496     printf_unfiltered ("The target is assumed to be %s endian\n",
 497                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 498 }
 499
 500 static void
 501 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 502 {
 503   if (set_endian_string == endian_auto)
 504     {
 505       target_byte_order_auto = 1;
 506     }
 507   else if (set_endian_string == endian_little)
 508     {
 509       target_byte_order_auto = 0;
 510       if (GDB_MULTI_ARCH)
 511         {
 512           struct gdbarch_info info;
 513           gdbarch_info_init (&info);
 514           info.byte_order = BFD_ENDIAN_LITTLE;
 515           if (! gdbarch_update_p (info))
 516             {
 517               printf_unfiltered ("Little endian target not supported by GDB\n");
 518             }
 519         }
 520       else
 521         {
 522           target_byte_order = BFD_ENDIAN_LITTLE;
 523         }
 524     }
 525   else if (set_endian_string == endian_big)
 526     {
 527       target_byte_order_auto = 0;
 528       if (GDB_MULTI_ARCH)
 529         {
 530           struct gdbarch_info info;
 531           gdbarch_info_init (&info);
 532           info.byte_order = BFD_ENDIAN_BIG;
 533           if (! gdbarch_update_p (info))
 534             {
 535               printf_unfiltered ("Big endian target not supported by GDB\n");
 536             }
 537         }
 538       else
 539         {
 540           target_byte_order = BFD_ENDIAN_BIG;
 541         }
 542     }
 543   else
 544     internal_error (__FILE__, __LINE__,
 545                     "set_endian: bad value");
 546   show_endian (NULL, from_tty);
 547 }
 548
 549 /* Set the endianness from a BFD.  */
 550
 551 static void
 552 set_endian_from_file (bfd *abfd)
 553 {
 554   int want;
 555   if (GDB_MULTI_ARCH)
 556     internal_error (__FILE__, __LINE__,
 557                     "set_endian_from_file: not for multi-arch");
 558   if (bfd_big_endian (abfd))
 559     want = BFD_ENDIAN_BIG;
 560   else
 561     want = BFD_ENDIAN_LITTLE;
 562   if (TARGET_BYTE_ORDER_AUTO)
 563     target_byte_order = want;
 564   else if (TARGET_BYTE_ORDER != want)
 565     warning ("%s endian file does not match %s endian target.",
 566              want == BFD_ENDIAN_BIG ? "big" : "little",
 567              TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little");
 568 }
 569
 570
 571 /* Functions to manipulate the architecture of the target */
 572
 573 enum set_arch { set_arch_auto, set_arch_manual };
 574
 575 int target_architecture_auto = 1;
 576
 577 const char *set_architecture_string;
 578
 579 /* Old way of changing the current architecture. */
 580
 581 extern const struct bfd_arch_info bfd_default_arch_struct;
 582 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
 583 int (*target_architecture_hook) (const struct bfd_arch_info *ap);
 584
 585 static int
 586 arch_ok (const struct bfd_arch_info *arch)
 587 {
 588   if (GDB_MULTI_ARCH)
 589     internal_error (__FILE__, __LINE__,
 590                     "arch_ok: not multi-arched");
 591   /* Should be performing the more basic check that the binary is
 592      compatible with GDB. */
 593   /* Check with the target that the architecture is valid. */
 594   return (target_architecture_hook == NULL
 595           || target_architecture_hook (arch));
 596 }
 597
 598 static void
 599 set_arch (const struct bfd_arch_info *arch,
 600           enum set_arch type)
 601 {
 602   if (GDB_MULTI_ARCH)
 603     internal_error (__FILE__, __LINE__,
 604                     "set_arch: not multi-arched");
 605   switch (type)
 606     {
 607     case set_arch_auto:
 608       if (!arch_ok (arch))
 609         warning ("Target may not support %s architecture",
 610                  arch->printable_name);
 611       target_architecture = arch;
 612       break;
 613     case set_arch_manual:
 614       if (!arch_ok (arch))
 615         {
 616           printf_unfiltered ("Target does not support `%s' architecture.\n",
 617                              arch->printable_name);
 618         }
 619       else
 620         {
 621           target_architecture_auto = 0;
 622           target_architecture = arch;
 623         }
 624       break;
 625     }
 626   if (gdbarch_debug)
 627     gdbarch_dump (current_gdbarch, gdb_stdlog);
 628 }
 629
 630 /* Set the architecture from arch/machine (deprecated) */
 631
 632 void
 633 set_architecture_from_arch_mach (enum bfd_architecture arch,
 634                                  unsigned long mach)
 635 {
 636   const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
 637   if (GDB_MULTI_ARCH)
 638     internal_error (__FILE__, __LINE__,
 639                     "set_architecture_from_arch_mach: not multi-arched");
 640   if (wanted != NULL)
 641     set_arch (wanted, set_arch_manual);
 642   else
 643     internal_error (__FILE__, __LINE__,
 644                     "gdbarch: hardwired architecture/machine not recognized");
 645 }
 646
 647 /* Set the architecture from a BFD (deprecated) */
 648
 649 static void
 650 set_architecture_from_file (bfd *abfd)
 651 {
 652   const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
 653   if (GDB_MULTI_ARCH)
 654     internal_error (__FILE__, __LINE__,
 655                     "set_architecture_from_file: not multi-arched");
 656   if (target_architecture_auto)
 657     {
 658       set_arch (wanted, set_arch_auto);
 659     }
 660   else if (wanted != target_architecture)
 661     {
 662       warning ("%s architecture file may be incompatible with %s target.",
 663                wanted->printable_name,
 664                target_architecture->printable_name);
 665     }
 666 }
 667
 668
 669 /* Called if the user enters ``show architecture'' without an
 670    argument. */
 671
 672 static void
 673 show_architecture (char *args, int from_tty)
 674 {
 675   const char *arch;
 676   arch = TARGET_ARCHITECTURE->printable_name;
 677   if (target_architecture_auto)
 678     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 679   else
 680     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 681 }
 682
 683
 684 /* Called if the user enters ``set architecture'' with or without an
 685    argument. */
 686
 687 static void
 688 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 689 {
 690   if (strcmp (set_architecture_string, "auto") == 0)
 691     {
 692       target_architecture_auto = 1;
 693     }
 694   else if (GDB_MULTI_ARCH)
 695     {
 696       struct gdbarch_info info;
 697       gdbarch_info_init (&info);
 698       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 699       if (info.bfd_arch_info == NULL)
 700         internal_error (__FILE__, __LINE__,
 701                         "set_architecture: bfd_scan_arch failed");
 702       if (gdbarch_update_p (info))
 703         target_architecture_auto = 0;
 704       else
 705         printf_unfiltered ("Architecture `%s' not recognized.\n",
 706                            set_architecture_string);
 707     }
 708   else
 709     {
 710       const struct bfd_arch_info *arch
 711         = bfd_scan_arch (set_architecture_string);
 712       if (arch == NULL)
 713         internal_error (__FILE__, __LINE__,
 714                         "set_architecture: bfd_scan_arch failed");
 715       set_arch (arch, set_arch_manual);
 716     }
 717   show_architecture (NULL, from_tty);
 718 }
 719
 720 /* Set the dynamic target-system-dependent parameters (architecture,
 721    byte-order) using information found in the BFD */
 722
 723 void
 724 set_gdbarch_from_file (bfd *abfd)
 725 {
 726   if (GDB_MULTI_ARCH)
 727     {
 728       struct gdbarch_info info;
 729       gdbarch_info_init (&info);
 730       info.abfd = abfd;
 731       if (! gdbarch_update_p (info))
 732         error ("Architecture of file not recognized.\n");
 733     }
 734   else
 735     {
 736       set_architecture_from_file (abfd);
 737       set_endian_from_file (abfd);
 738     }
 739 }
 740
 741 /* Initialize the current architecture.  Update the ``set
 742    architecture'' command so that it specifies a list of valid
 743    architectures.  */
 744
 745 #ifdef DEFAULT_BFD_ARCH
 746 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 747 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 748 #else
 749 static const bfd_arch_info_type *default_bfd_arch;
 750 #endif
 751
 752 #ifdef DEFAULT_BFD_VEC
 753 extern const bfd_target DEFAULT_BFD_VEC;
 754 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 755 #else
 756 static const bfd_target *default_bfd_vec;
 757 #endif
 758
 759 void
 760 initialize_current_architecture (void)
 761 {
 762   const char **arches = gdbarch_printable_names ();
 763
 764   /* determine a default architecture and byte order. */
 765   struct gdbarch_info info;
 766   gdbarch_info_init (&info);
 767
 768   /* Find a default architecture. */
 769   if (info.bfd_arch_info == NULL
 770       && default_bfd_arch != NULL)
 771     info.bfd_arch_info = default_bfd_arch;
 772   if (info.bfd_arch_info == NULL)
 773     {
 774       /* Choose the architecture by taking the first one
 775          alphabetically. */
 776       const char *chosen = arches[0];
 777       const char **arch;
 778       for (arch = arches; *arch != NULL; arch++)
 779         {
 780           if (strcmp (*arch, chosen) < 0)
 781             chosen = *arch;
 782         }
 783       if (chosen == NULL)
 784         internal_error (__FILE__, __LINE__,
 785                         "initialize_current_architecture: No arch");
 786       info.bfd_arch_info = bfd_scan_arch (chosen);
 787       if (info.bfd_arch_info == NULL)
 788         internal_error (__FILE__, __LINE__,
 789                         "initialize_current_architecture: Arch not found");
 790     }
 791
 792   /* Take several guesses at a byte order.  */
 793   if (info.byte_order == BFD_ENDIAN_UNKNOWN
 794       && default_bfd_vec != NULL)
 795     {
 796       /* Extract BFD's default vector's byte order. */
 797       switch (default_bfd_vec->byteorder)
 798         {
 799         case BFD_ENDIAN_BIG:
 800           info.byte_order = BFD_ENDIAN_BIG;
 801           break;
 802         case BFD_ENDIAN_LITTLE:
 803           info.byte_order = BFD_ENDIAN_LITTLE;
 804           break;
 805         default:
 806           break;
 807         }
 808     }
 809   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 810     {
 811       /* look for ``*el-*'' in the target name. */
 812       const char *chp;
 813       chp = strchr (target_name, '-');
 814       if (chp != NULL
 815           && chp - 2 >= target_name
 816           && strncmp (chp - 2, "el", 2) == 0)
 817         info.byte_order = BFD_ENDIAN_LITTLE;
 818     }
 819   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 820     {
 821       /* Wire it to big-endian!!! */
 822       info.byte_order = BFD_ENDIAN_BIG;
 823     }
 824
 825   if (GDB_MULTI_ARCH)
 826     {
 827       if (! gdbarch_update_p (info))
 828         {
 829           internal_error (__FILE__, __LINE__,
 830                           "initialize_current_architecture: Selection of initial architecture failed");
 831         }
 832     }
 833   else
 834     {
 835       /* If the multi-arch logic comes up with a byte-order (from BFD)
 836          use it for the non-multi-arch case.  */
 837       if (info.byte_order != BFD_ENDIAN_UNKNOWN)
 838         target_byte_order = info.byte_order;
 839       initialize_non_multiarch ();
 840     }
 841
 842   /* Create the ``set architecture'' command appending ``auto'' to the
 843      list of architectures. */
 844   {
 845     struct cmd_list_element *c;
 846     /* Append ``auto''. */
 847     int nr;
 848     for (nr = 0; arches[nr] != NULL; nr++);
 849     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 850     arches[nr + 0] = "auto";
 851     arches[nr + 1] = NULL;
 852     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 853        of ``const char *''.  We just happen to know that the casts are
 854        safe. */
 855     c = add_set_enum_cmd ("architecture", class_support,
 856                           arches, &set_architecture_string,
 857                           "Set architecture of target.",
 858                           &setlist);
 859     set_cmd_sfunc (c, set_architecture);
 860     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 861     /* Don't use set_from_show - need to print both auto/manual and
 862        current setting. */
 863     add_cmd ("architecture", class_support, show_architecture,
 864              "Show the current target architecture", &showlist);
 865   }
 866 }
 867
 868
 869 /* Initialize a gdbarch info to values that will be automatically
 870    overridden.  Note: Originally, this ``struct info'' was initialized
 871    using memset(0).  Unfortunatly, that ran into problems, namely
 872    BFD_ENDIAN_BIG is zero.  An explicit initialization function that
 873    can explicitly set each field to a well defined value is used.  */
 874
 875 void
 876 gdbarch_info_init (struct gdbarch_info *info)
 877 {
 878   memset (info, 0, sizeof (struct gdbarch_info));
 879   info->byte_order = BFD_ENDIAN_UNKNOWN;
 880   info->osabi = GDB_OSABI_UNINITIALIZED;
 881 }
 882
 883 /* */
 884
 885 extern initialize_file_ftype _initialize_gdbarch_utils;
 886
 887 void
 888 _initialize_gdbarch_utils (void)
 889 {
 890   struct cmd_list_element *c;
 891   c = add_set_enum_cmd ("endian", class_support,
 892                         endian_enum, &set_endian_string,
 893                         "Set endianness of target.",
 894                         &setlist);
 895   set_cmd_sfunc (c, set_endian);
 896   /* Don't use set_from_show - need to print both auto/manual and
 897      current setting. */
 898   add_cmd ("endian", class_support, show_endian,
 899            "Show the current byte-order", &showlist);
 900 }