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 /* Use the program counter to determine the contents and size
  52    of a breakpoint instruction.  If no target-dependent macro
  53    BREAKPOINT_FROM_PC has been defined to implement this function,
  54    assume that the breakpoint doesn't depend on the PC, and
  55    use the values of the BIG_BREAKPOINT and LITTLE_BREAKPOINT macros.
  56    Return a pointer to a string of bytes that encode a breakpoint
  57    instruction, stores the length of the string to *lenptr,
  58    and optionally adjust the pc to point to the correct memory location
  59    for inserting the breakpoint.  */
  60
  61 const unsigned char *
  62 legacy_breakpoint_from_pc (CORE_ADDR * pcptr, int *lenptr)
  63 {
  64   /* {BIG_,LITTLE_}BREAKPOINT is the sequence of bytes we insert for a
  65      breakpoint.  On some machines, breakpoints are handled by the
  66      target environment and we don't have to worry about them here.  */
  67 #ifdef BIG_BREAKPOINT
  68   if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
  69     {
  70       static unsigned char big_break_insn[] = BIG_BREAKPOINT;
  71       *lenptr = sizeof (big_break_insn);
  72       return big_break_insn;
  73     }
  74 #endif
  75 #ifdef LITTLE_BREAKPOINT
  76   if (TARGET_BYTE_ORDER != BFD_ENDIAN_BIG)
  77     {
  78       static unsigned char little_break_insn[] = LITTLE_BREAKPOINT;
  79       *lenptr = sizeof (little_break_insn);
  80       return little_break_insn;
  81     }
  82 #endif
  83 #ifdef BREAKPOINT
  84   {
  85     static unsigned char break_insn[] = BREAKPOINT;
  86     *lenptr = sizeof (break_insn);
  87     return break_insn;
  88   }
  89 #endif
  90   *lenptr = 0;
  91   return NULL;
  92 }
  93
  94 /* Implementation of extract return value that grubs around in the
  95    register cache.  */
  96 void
  97 legacy_extract_return_value (struct type *type, struct regcache *regcache,
  98                              void *valbuf)
  99 {
 100   char *registers = deprecated_grub_regcache_for_registers (regcache);
 101   bfd_byte *buf = valbuf;
 102   DEPRECATED_EXTRACT_RETURN_VALUE (type, registers, buf); /* OK */
 103 }
 104
 105 /* Implementation of store return value that grubs the register cache.
 106    Takes a local copy of the buffer to avoid const problems.  */
 107 void
 108 legacy_store_return_value (struct type *type, struct regcache *regcache,
 109                            const void *buf)
 110 {
 111   bfd_byte *b = alloca (TYPE_LENGTH (type));
 112   gdb_assert (regcache == current_regcache);
 113   memcpy (b, buf, TYPE_LENGTH (type));
 114   DEPRECATED_STORE_RETURN_VALUE (type, b);
 115 }
 116
 117
 118 int
 119 legacy_register_sim_regno (int regnum)
 120 {
 121   /* Only makes sense to supply raw registers.  */
 122   gdb_assert (regnum >= 0 && regnum < NUM_REGS);
 123   /* NOTE: cagney/2002-05-13: The old code did it this way and it is
 124      suspected that some GDB/SIM combinations may rely on this
 125      behavour.  The default should be one2one_register_sim_regno
 126      (below).  */
 127   if (REGISTER_NAME (regnum) != NULL
 128       && REGISTER_NAME (regnum)[0] != '\0')
 129     return regnum;
 130   else
 131     return LEGACY_SIM_REGNO_IGNORE;
 132 }
 133
 134 int
 135 generic_frameless_function_invocation_not (struct frame_info *fi)
 136 {
 137   return 0;
 138 }
 139
 140 int
 141 generic_return_value_on_stack_not (struct type *type)
 142 {
 143   return 0;
 144 }
 145
 146 CORE_ADDR
 147 generic_skip_trampoline_code (CORE_ADDR pc)
 148 {
 149   return 0;
 150 }
 151
 152 int
 153 generic_in_solib_call_trampoline (CORE_ADDR pc, char *name)
 154 {
 155   return 0;
 156 }
 157
 158 int
 159 generic_in_solib_return_trampoline (CORE_ADDR pc, char *name)
 160 {
 161   return 0;
 162 }
 163
 164 int
 165 generic_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
 166 {
 167   return 0;
 168 }
 169
 170 const char *
 171 legacy_register_name (int i)
 172 {
 173 #ifdef REGISTER_NAMES
 174   static char *names[] = REGISTER_NAMES;
 175   if (i < 0 || i >= (sizeof (names) / sizeof (*names)))
 176     return NULL;
 177   else
 178     return names[i];
 179 #else
 180   internal_error (__FILE__, __LINE__,
 181                   "legacy_register_name: called.");
 182   return NULL;
 183 #endif
 184 }
 185
 186 #if defined (CALL_DUMMY)
 187 LONGEST legacy_call_dummy_words[] = CALL_DUMMY;
 188 #else
 189 LONGEST legacy_call_dummy_words[1];
 190 #endif
 191 int legacy_sizeof_call_dummy_words = sizeof (legacy_call_dummy_words);
 192
 193 void
 194 generic_remote_translate_xfer_address (CORE_ADDR gdb_addr, int gdb_len,
 195                                        CORE_ADDR * rem_addr, int *rem_len)
 196 {
 197   *rem_addr = gdb_addr;
 198   *rem_len = gdb_len;
 199 }
 200
 201 int
 202 generic_prologue_frameless_p (CORE_ADDR ip)
 203 {
 204   return ip == SKIP_PROLOGUE (ip);
 205 }
 206
 207 /* New/multi-arched targets should use the correct gdbarch field
 208    instead of using this global pointer. */
 209 int
 210 legacy_print_insn (bfd_vma vma, disassemble_info *info)
 211 {
 212   return (*tm_print_insn) (vma, info);
 213 }
 214
 215 /* Helper functions for INNER_THAN */
 216
 217 int
 218 core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
 219 {
 220   return (lhs < rhs);
 221 }
 222
 223 int
 224 core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
 225 {
 226   return (lhs > rhs);
 227 }
 228
 229
 230 /* Helper functions for TARGET_{FLOAT,DOUBLE}_FORMAT */
 231
 232 const struct floatformat *
 233 default_float_format (struct gdbarch *gdbarch)
 234 {
 235 #if GDB_MULTI_ARCH
 236   int byte_order = gdbarch_byte_order (gdbarch);
 237 #else
 238   int byte_order = TARGET_BYTE_ORDER;
 239 #endif
 240   switch (byte_order)
 241     {
 242     case BFD_ENDIAN_BIG:
 243       return &floatformat_ieee_single_big;
 244     case BFD_ENDIAN_LITTLE:
 245       return &floatformat_ieee_single_little;
 246     default:
 247       internal_error (__FILE__, __LINE__,
 248                       "default_float_format: bad byte order");
 249     }
 250 }
 251
 252
 253 const struct floatformat *
 254 default_double_format (struct gdbarch *gdbarch)
 255 {
 256 #if GDB_MULTI_ARCH
 257   int byte_order = gdbarch_byte_order (gdbarch);
 258 #else
 259   int byte_order = TARGET_BYTE_ORDER;
 260 #endif
 261   switch (byte_order)
 262     {
 263     case BFD_ENDIAN_BIG:
 264       return &floatformat_ieee_double_big;
 265     case BFD_ENDIAN_LITTLE:
 266       return &floatformat_ieee_double_little;
 267     default:
 268       internal_error (__FILE__, __LINE__,
 269                       "default_double_format: bad byte order");
 270     }
 271 }
 272
 273 /* Misc helper functions for targets. */
 274
 275 int
 276 frame_num_args_unknown (struct frame_info *fi)
 277 {
 278   return -1;
 279 }
 280
 281
 282 int
 283 generic_register_convertible_not (int num)
 284 {
 285   return 0;
 286 }
 287
 288
 289 /* Under some ABI's that specify the `struct convention' for returning
 290    structures by value, by the time we've returned from the function,
 291    the return value is sitting there in the caller's buffer, but GDB
 292    has no way to find the address of that buffer.
 293
 294    On such architectures, use this function as your
 295    extract_struct_value_address method.  When asked to a struct
 296    returned by value in this fashion, GDB will print a nice error
 297    message, instead of garbage.  */
 298 CORE_ADDR
 299 generic_cannot_extract_struct_value_address (char *dummy)
 300 {
 301   return 0;
 302 }
 303
 304 CORE_ADDR
 305 core_addr_identity (CORE_ADDR addr)
 306 {
 307   return addr;
 308 }
 309
 310 int
 311 no_op_reg_to_regnum (int reg)
 312 {
 313   return reg;
 314 }
 315
 316 /* Default prepare_to_procced().  */
 317 int
 318 default_prepare_to_proceed (int select_it)
 319 {
 320   return 0;
 321 }
 322
 323 /* Generic prepare_to_proceed().  This one should be suitable for most
 324    targets that support threads. */
 325 int
 326 generic_prepare_to_proceed (int select_it)
 327 {
 328   ptid_t wait_ptid;
 329   struct target_waitstatus wait_status;
 330
 331   /* Get the last target status returned by target_wait().  */
 332   get_last_target_status (&wait_ptid, &wait_status);
 333
 334   /* Make sure we were stopped either at a breakpoint, or because
 335      of a Ctrl-C.  */
 336   if (wait_status.kind != TARGET_WAITKIND_STOPPED
 337       || (wait_status.value.sig != TARGET_SIGNAL_TRAP &&
 338           wait_status.value.sig != TARGET_SIGNAL_INT))
 339     {
 340       return 0;
 341     }
 342
 343   if (!ptid_equal (wait_ptid, minus_one_ptid)
 344       && !ptid_equal (inferior_ptid, wait_ptid))
 345     {
 346       /* Switched over from WAIT_PID.  */
 347       CORE_ADDR wait_pc = read_pc_pid (wait_ptid);
 348
 349       if (wait_pc != read_pc ())
 350         {
 351           if (select_it)
 352             {
 353               /* Switch back to WAIT_PID thread.  */
 354               inferior_ptid = wait_ptid;
 355
 356               /* FIXME: This stuff came from switch_to_thread() in
 357                  thread.c (which should probably be a public function).  */
 358               flush_cached_frames ();
 359               registers_changed ();
 360               stop_pc = wait_pc;
 361               select_frame (get_current_frame ());
 362             }
 363           /* We return 1 to indicate that there is a breakpoint here,
 364              so we need to step over it before continuing to avoid
 365              hitting it straight away. */
 366           if (breakpoint_here_p (wait_pc))
 367             {
 368               return 1;
 369             }
 370         }
 371     }
 372   return 0;
 373
 374 }
 375
 376 CORE_ADDR
 377 init_frame_pc_noop (int fromleaf, struct frame_info *prev)
 378 {
 379   /* Do nothing, implies return the same PC value.  */
 380   return get_frame_pc (prev);
 381 }
 382
 383 CORE_ADDR
 384 init_frame_pc_default (int fromleaf, struct frame_info *prev)
 385 {
 386   if (fromleaf && SAVED_PC_AFTER_CALL_P ())
 387     return SAVED_PC_AFTER_CALL (get_next_frame (prev));
 388   else if (get_next_frame (prev) != NULL)
 389     return DEPRECATED_FRAME_SAVED_PC (get_next_frame (prev));
 390   else
 391     return read_pc ();
 392 }
 393
 394 void
 395 default_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
 396 {
 397   return;
 398 }
 399
 400 void
 401 default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
 402 {
 403   return;
 404 }
 405
 406 int
 407 cannot_register_not (int regnum)
 408 {
 409   return 0;
 410 }
 411
 412 /* Legacy version of target_virtual_frame_pointer().  Assumes that
 413    there is an FP_REGNUM and that it is the same, cooked or raw.  */
 414
 415 void
 416 legacy_virtual_frame_pointer (CORE_ADDR pc,
 417                               int *frame_regnum,
 418                               LONGEST *frame_offset)
 419 {
 420   /* FIXME: cagney/2002-09-13: This code is used when identifying the
 421      frame pointer of the current PC.  It is assuming that a single
 422      register and an offset can determine this.  I think it should
 423      instead generate a byte code expression as that would work better
 424      with things like Dwarf2's CFI.  */
 425   if (FP_REGNUM >= 0 && FP_REGNUM < NUM_REGS)
 426     *frame_regnum = FP_REGNUM;
 427   else if (SP_REGNUM >= 0 && SP_REGNUM < NUM_REGS)
 428     *frame_regnum = SP_REGNUM;
 429   else
 430     /* Should this be an internal error?  I guess so, it is reflecting
 431        an architectural limitation in the current design.  */
 432     internal_error (__FILE__, __LINE__, "No virtual frame pointer available");
 433   *frame_offset = 0;
 434 }
 435
 436 /* Assume the world is sane, every register's virtual and real size
 437    is identical.  */
 438
 439 int
 440 generic_register_size (int regnum)
 441 {
 442   gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
 443   if (gdbarch_register_type_p (current_gdbarch))
 444     return TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum));
 445   else
 446     /* FIXME: cagney/2003-03-01: Once all architectures implement
 447        gdbarch_register_type(), this entire function can go away.  It
 448        is made obsolete by register_size().  */
 449     return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (regnum)); /* OK */
 450 }
 451
 452 /* Assume all registers are adjacent.  */
 453
 454 int
 455 generic_register_byte (int regnum)
 456 {
 457   int byte;
 458   int i;
 459   gdb_assert (regnum >= 0 && regnum < NUM_REGS + NUM_PSEUDO_REGS);
 460   byte = 0;
 461   for (i = 0; i < regnum; i++)
 462     {
 463       byte += generic_register_size (i);
 464     }
 465   return byte;
 466 }
 467
 468 \f
 469 int
 470 legacy_pc_in_sigtramp (CORE_ADDR pc, char *name)
 471 {
 472 #if !defined (IN_SIGTRAMP)
 473   if (SIGTRAMP_START_P ())
 474     return (pc) >= SIGTRAMP_START (pc) && (pc) < SIGTRAMP_END (pc);
 475   else
 476     return name && strcmp ("_sigtramp", name) == 0;
 477 #else
 478   return IN_SIGTRAMP (pc, name);
 479 #endif
 480 }
 481
 482 int
 483 legacy_convert_register_p (int regnum)
 484 {
 485   return REGISTER_CONVERTIBLE (regnum);
 486 }
 487
 488 void
 489 legacy_register_to_value (int regnum, struct type *type,
 490                           char *from, char *to)
 491 {
 492   REGISTER_CONVERT_TO_VIRTUAL (regnum, type, from, to);
 493 }
 494
 495 void
 496 legacy_value_to_register (struct type *type, int regnum,
 497                           char *from, char *to)
 498 {
 499   REGISTER_CONVERT_TO_RAW (type, regnum, from, to);
 500 }
 501
 502 \f
 503 /* Functions to manipulate the endianness of the target.  */
 504
 505 /* ``target_byte_order'' is only used when non- multi-arch.
 506    Multi-arch targets obtain the current byte order using the
 507    TARGET_BYTE_ORDER gdbarch method.
 508
 509    The choice of initial value is entirely arbitrary.  During startup,
 510    the function initialize_current_architecture() updates this value
 511    based on default byte-order information extracted from BFD.  */
 512 int target_byte_order = BFD_ENDIAN_BIG;
 513 int target_byte_order_auto = 1;
 514
 515 static const char endian_big[] = "big";
 516 static const char endian_little[] = "little";
 517 static const char endian_auto[] = "auto";
 518 static const char *endian_enum[] =
 519 {
 520   endian_big,
 521   endian_little,
 522   endian_auto,
 523   NULL,
 524 };
 525 static const char *set_endian_string;
 526
 527 /* Called by ``show endian''.  */
 528
 529 static void
 530 show_endian (char *args, int from_tty)
 531 {
 532   if (TARGET_BYTE_ORDER_AUTO)
 533     printf_unfiltered ("The target endianness is set automatically (currently %s endian)\n",
 534                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 535   else
 536     printf_unfiltered ("The target is assumed to be %s endian\n",
 537                        (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little"));
 538 }
 539
 540 static void
 541 set_endian (char *ignore_args, int from_tty, struct cmd_list_element *c)
 542 {
 543   if (set_endian_string == endian_auto)
 544     {
 545       target_byte_order_auto = 1;
 546     }
 547   else if (set_endian_string == endian_little)
 548     {
 549       target_byte_order_auto = 0;
 550       if (GDB_MULTI_ARCH)
 551         {
 552           struct gdbarch_info info;
 553           gdbarch_info_init (&info);
 554           info.byte_order = BFD_ENDIAN_LITTLE;
 555           if (! gdbarch_update_p (info))
 556             {
 557               printf_unfiltered ("Little endian target not supported by GDB\n");
 558             }
 559         }
 560       else
 561         {
 562           target_byte_order = BFD_ENDIAN_LITTLE;
 563         }
 564     }
 565   else if (set_endian_string == endian_big)
 566     {
 567       target_byte_order_auto = 0;
 568       if (GDB_MULTI_ARCH)
 569         {
 570           struct gdbarch_info info;
 571           gdbarch_info_init (&info);
 572           info.byte_order = BFD_ENDIAN_BIG;
 573           if (! gdbarch_update_p (info))
 574             {
 575               printf_unfiltered ("Big endian target not supported by GDB\n");
 576             }
 577         }
 578       else
 579         {
 580           target_byte_order = BFD_ENDIAN_BIG;
 581         }
 582     }
 583   else
 584     internal_error (__FILE__, __LINE__,
 585                     "set_endian: bad value");
 586   show_endian (NULL, from_tty);
 587 }
 588
 589 /* Set the endianness from a BFD.  */
 590
 591 static void
 592 set_endian_from_file (bfd *abfd)
 593 {
 594   int want;
 595   if (GDB_MULTI_ARCH)
 596     internal_error (__FILE__, __LINE__,
 597                     "set_endian_from_file: not for multi-arch");
 598   if (bfd_big_endian (abfd))
 599     want = BFD_ENDIAN_BIG;
 600   else
 601     want = BFD_ENDIAN_LITTLE;
 602   if (TARGET_BYTE_ORDER_AUTO)
 603     target_byte_order = want;
 604   else if (TARGET_BYTE_ORDER != want)
 605     warning ("%s endian file does not match %s endian target.",
 606              want == BFD_ENDIAN_BIG ? "big" : "little",
 607              TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "big" : "little");
 608 }
 609
 610
 611 /* Functions to manipulate the architecture of the target */
 612
 613 enum set_arch { set_arch_auto, set_arch_manual };
 614
 615 int target_architecture_auto = 1;
 616
 617 const char *set_architecture_string;
 618
 619 /* Old way of changing the current architecture. */
 620
 621 extern const struct bfd_arch_info bfd_default_arch_struct;
 622 const struct bfd_arch_info *target_architecture = &bfd_default_arch_struct;
 623 int (*target_architecture_hook) (const struct bfd_arch_info *ap);
 624
 625 static int
 626 arch_ok (const struct bfd_arch_info *arch)
 627 {
 628   if (GDB_MULTI_ARCH)
 629     internal_error (__FILE__, __LINE__,
 630                     "arch_ok: not multi-arched");
 631   /* Should be performing the more basic check that the binary is
 632      compatible with GDB. */
 633   /* Check with the target that the architecture is valid. */
 634   return (target_architecture_hook == NULL
 635           || target_architecture_hook (arch));
 636 }
 637
 638 static void
 639 set_arch (const struct bfd_arch_info *arch,
 640           enum set_arch type)
 641 {
 642   if (GDB_MULTI_ARCH)
 643     internal_error (__FILE__, __LINE__,
 644                     "set_arch: not multi-arched");
 645   switch (type)
 646     {
 647     case set_arch_auto:
 648       if (!arch_ok (arch))
 649         warning ("Target may not support %s architecture",
 650                  arch->printable_name);
 651       target_architecture = arch;
 652       break;
 653     case set_arch_manual:
 654       if (!arch_ok (arch))
 655         {
 656           printf_unfiltered ("Target does not support `%s' architecture.\n",
 657                              arch->printable_name);
 658         }
 659       else
 660         {
 661           target_architecture_auto = 0;
 662           target_architecture = arch;
 663         }
 664       break;
 665     }
 666   if (gdbarch_debug)
 667     gdbarch_dump (current_gdbarch, gdb_stdlog);
 668 }
 669
 670 /* Set the architecture from arch/machine (deprecated) */
 671
 672 void
 673 set_architecture_from_arch_mach (enum bfd_architecture arch,
 674                                  unsigned long mach)
 675 {
 676   const struct bfd_arch_info *wanted = bfd_lookup_arch (arch, mach);
 677   if (GDB_MULTI_ARCH)
 678     internal_error (__FILE__, __LINE__,
 679                     "set_architecture_from_arch_mach: not multi-arched");
 680   if (wanted != NULL)
 681     set_arch (wanted, set_arch_manual);
 682   else
 683     internal_error (__FILE__, __LINE__,
 684                     "gdbarch: hardwired architecture/machine not recognized");
 685 }
 686
 687 /* Set the architecture from a BFD (deprecated) */
 688
 689 static void
 690 set_architecture_from_file (bfd *abfd)
 691 {
 692   const struct bfd_arch_info *wanted = bfd_get_arch_info (abfd);
 693   if (GDB_MULTI_ARCH)
 694     internal_error (__FILE__, __LINE__,
 695                     "set_architecture_from_file: not multi-arched");
 696   if (target_architecture_auto)
 697     {
 698       set_arch (wanted, set_arch_auto);
 699     }
 700   else if (wanted != target_architecture)
 701     {
 702       warning ("%s architecture file may be incompatible with %s target.",
 703                wanted->printable_name,
 704                target_architecture->printable_name);
 705     }
 706 }
 707
 708
 709 /* Called if the user enters ``show architecture'' without an
 710    argument. */
 711
 712 static void
 713 show_architecture (char *args, int from_tty)
 714 {
 715   const char *arch;
 716   arch = TARGET_ARCHITECTURE->printable_name;
 717   if (target_architecture_auto)
 718     printf_filtered ("The target architecture is set automatically (currently %s)\n", arch);
 719   else
 720     printf_filtered ("The target architecture is assumed to be %s\n", arch);
 721 }
 722
 723
 724 /* Called if the user enters ``set architecture'' with or without an
 725    argument. */
 726
 727 static void
 728 set_architecture (char *ignore_args, int from_tty, struct cmd_list_element *c)
 729 {
 730   if (strcmp (set_architecture_string, "auto") == 0)
 731     {
 732       target_architecture_auto = 1;
 733     }
 734   else if (GDB_MULTI_ARCH)
 735     {
 736       struct gdbarch_info info;
 737       gdbarch_info_init (&info);
 738       info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
 739       if (info.bfd_arch_info == NULL)
 740         internal_error (__FILE__, __LINE__,
 741                         "set_architecture: bfd_scan_arch failed");
 742       if (gdbarch_update_p (info))
 743         target_architecture_auto = 0;
 744       else
 745         printf_unfiltered ("Architecture `%s' not recognized.\n",
 746                            set_architecture_string);
 747     }
 748   else
 749     {
 750       const struct bfd_arch_info *arch
 751         = bfd_scan_arch (set_architecture_string);
 752       if (arch == NULL)
 753         internal_error (__FILE__, __LINE__,
 754                         "set_architecture: bfd_scan_arch failed");
 755       set_arch (arch, set_arch_manual);
 756     }
 757   show_architecture (NULL, from_tty);
 758 }
 759
 760 /* Set the dynamic target-system-dependent parameters (architecture,
 761    byte-order) using information found in the BFD */
 762
 763 void
 764 set_gdbarch_from_file (bfd *abfd)
 765 {
 766   if (GDB_MULTI_ARCH)
 767     {
 768       struct gdbarch_info info;
 769       gdbarch_info_init (&info);
 770       info.abfd = abfd;
 771       if (! gdbarch_update_p (info))
 772         error ("Architecture of file not recognized.\n");
 773     }
 774   else
 775     {
 776       set_architecture_from_file (abfd);
 777       set_endian_from_file (abfd);
 778     }
 779 }
 780
 781 /* Initialize the current architecture.  Update the ``set
 782    architecture'' command so that it specifies a list of valid
 783    architectures.  */
 784
 785 #ifdef DEFAULT_BFD_ARCH
 786 extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
 787 static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
 788 #else
 789 static const bfd_arch_info_type *default_bfd_arch;
 790 #endif
 791
 792 #ifdef DEFAULT_BFD_VEC
 793 extern const bfd_target DEFAULT_BFD_VEC;
 794 static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
 795 #else
 796 static const bfd_target *default_bfd_vec;
 797 #endif
 798
 799 void
 800 initialize_current_architecture (void)
 801 {
 802   const char **arches = gdbarch_printable_names ();
 803
 804   /* determine a default architecture and byte order. */
 805   struct gdbarch_info info;
 806   gdbarch_info_init (&info);
 807
 808   /* Find a default architecture. */
 809   if (info.bfd_arch_info == NULL
 810       && default_bfd_arch != NULL)
 811     info.bfd_arch_info = default_bfd_arch;
 812   if (info.bfd_arch_info == NULL)
 813     {
 814       /* Choose the architecture by taking the first one
 815          alphabetically. */
 816       const char *chosen = arches[0];
 817       const char **arch;
 818       for (arch = arches; *arch != NULL; arch++)
 819         {
 820           if (strcmp (*arch, chosen) < 0)
 821             chosen = *arch;
 822         }
 823       if (chosen == NULL)
 824         internal_error (__FILE__, __LINE__,
 825                         "initialize_current_architecture: No arch");
 826       info.bfd_arch_info = bfd_scan_arch (chosen);
 827       if (info.bfd_arch_info == NULL)
 828         internal_error (__FILE__, __LINE__,
 829                         "initialize_current_architecture: Arch not found");
 830     }
 831
 832   /* Take several guesses at a byte order.  */
 833   if (info.byte_order == BFD_ENDIAN_UNKNOWN
 834       && default_bfd_vec != NULL)
 835     {
 836       /* Extract BFD's default vector's byte order. */
 837       switch (default_bfd_vec->byteorder)
 838         {
 839         case BFD_ENDIAN_BIG:
 840           info.byte_order = BFD_ENDIAN_BIG;
 841           break;
 842         case BFD_ENDIAN_LITTLE:
 843           info.byte_order = BFD_ENDIAN_LITTLE;
 844           break;
 845         default:
 846           break;
 847         }
 848     }
 849   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 850     {
 851       /* look for ``*el-*'' in the target name. */
 852       const char *chp;
 853       chp = strchr (target_name, '-');
 854       if (chp != NULL
 855           && chp - 2 >= target_name
 856           && strncmp (chp - 2, "el", 2) == 0)
 857         info.byte_order = BFD_ENDIAN_LITTLE;
 858     }
 859   if (info.byte_order == BFD_ENDIAN_UNKNOWN)
 860     {
 861       /* Wire it to big-endian!!! */
 862       info.byte_order = BFD_ENDIAN_BIG;
 863     }
 864
 865   if (GDB_MULTI_ARCH)
 866     {
 867       if (! gdbarch_update_p (info))
 868         {
 869           internal_error (__FILE__, __LINE__,
 870                           "initialize_current_architecture: Selection of initial architecture failed");
 871         }
 872     }
 873   else
 874     {
 875       /* If the multi-arch logic comes up with a byte-order (from BFD)
 876          use it for the non-multi-arch case.  */
 877       if (info.byte_order != BFD_ENDIAN_UNKNOWN)
 878         target_byte_order = info.byte_order;
 879       initialize_non_multiarch ();
 880     }
 881
 882   /* Create the ``set architecture'' command appending ``auto'' to the
 883      list of architectures. */
 884   {
 885     struct cmd_list_element *c;
 886     /* Append ``auto''. */
 887     int nr;
 888     for (nr = 0; arches[nr] != NULL; nr++);
 889     arches = xrealloc (arches, sizeof (char*) * (nr + 2));
 890     arches[nr + 0] = "auto";
 891     arches[nr + 1] = NULL;
 892     /* FIXME: add_set_enum_cmd() uses an array of ``char *'' instead
 893        of ``const char *''.  We just happen to know that the casts are
 894        safe. */
 895     c = add_set_enum_cmd ("architecture", class_support,
 896                           arches, &set_architecture_string,
 897                           "Set architecture of target.",
 898                           &setlist);
 899     set_cmd_sfunc (c, set_architecture);
 900     add_alias_cmd ("processor", "architecture", class_support, 1, &setlist);
 901     /* Don't use set_from_show - need to print both auto/manual and
 902        current setting. */
 903     add_cmd ("architecture", class_support, show_architecture,
 904              "Show the current target architecture", &showlist);
 905   }
 906 }
 907
 908
 909 /* Initialize a gdbarch info to values that will be automatically
 910    overridden.  Note: Originally, this ``struct info'' was initialized
 911    using memset(0).  Unfortunatly, that ran into problems, namely
 912    BFD_ENDIAN_BIG is zero.  An explicit initialization function that
 913    can explicitly set each field to a well defined value is used.  */
 914
 915 void
 916 gdbarch_info_init (struct gdbarch_info *info)
 917 {
 918   memset (info, 0, sizeof (struct gdbarch_info));
 919   info->byte_order = BFD_ENDIAN_UNKNOWN;
 920   info->osabi = GDB_OSABI_UNINITIALIZED;
 921 }
 922
 923 /* */
 924
 925 extern initialize_file_ftype _initialize_gdbarch_utils;
 926
 927 void
 928 _initialize_gdbarch_utils (void)
 929 {
 930   struct cmd_list_element *c;
 931   c = add_set_enum_cmd ("endian", class_support,
 932                         endian_enum, &set_endian_string,
 933                         "Set endianness of target.",
 934                         &setlist);
 935   set_cmd_sfunc (c, set_endian);
 936   /* Don't use set_from_show - need to print both auto/manual and
 937      current setting. */
 938   add_cmd ("endian", class_support, show_endian,
 939            "Show the current byte-order", &showlist);
 940 }