bfd/coff-arm.c

   1 /* BFD back-end for ARM COFF files.
   2    Copyright 1990, 91, 92, 93, 94, 95, 96, 97, 98, 99, 2000
   3    Free Software Foundation, Inc.
   4    Written by Cygnus Support.
   5
   6 This file is part of BFD, the Binary File Descriptor library.
   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, Boston, MA 02111-1307, USA.  */
  21
  22 #include "bfd.h"
  23 #include "sysdep.h"
  24 #include "libbfd.h"
  25
  26 #include "coff/arm.h"
  27
  28 #include "coff/internal.h"
  29
  30 #ifdef COFF_WITH_PE
  31 #include "coff/pe.h"
  32 #endif
  33
  34 #include "libcoff.h"
  35
  36 /* Macros for manipulation the bits in the flags field of the coff data
  37    structure.  */
  38 #define APCS_26_FLAG(       abfd )      (coff_data (abfd)->flags & F_APCS_26)
  39 #define APCS_FLOAT_FLAG(    abfd )      (coff_data (abfd)->flags & F_APCS_FLOAT)
  40 #define PIC_FLAG(           abfd )      (coff_data (abfd)->flags & F_PIC)
  41 #define APCS_SET(           abfd )      (coff_data (abfd)->flags & F_APCS_SET)
  42 #define SET_APCS_FLAGS(     abfd, flgs) (coff_data (abfd)->flags = \
  43                                         (coff_data (abfd)->flags & ~ (F_APCS_26 | F_APCS_FLOAT | F_PIC)) \
  44                                          | (flgs | F_APCS_SET))
  45 #define INTERWORK_FLAG(     abfd )      (coff_data (abfd)->flags & F_INTERWORK)
  46 #define INTERWORK_SET(      abfd )      (coff_data (abfd)->flags & F_INTERWORK_SET)
  47 #define SET_INTERWORK_FLAG( abfd, flg ) (coff_data (abfd)->flags = \
  48                                         (coff_data (abfd)->flags & ~ F_INTERWORK) \
  49                                          | (flg | F_INTERWORK_SET))
  50
  51 #ifndef NUM_ELEM
  52 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
  53 #endif
  54
  55 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
  56 /* some typedefs for holding instructions */
  57 typedef unsigned long int insn32;
  58 typedef unsigned short int insn16;
  59
  60      /* Forward declarations for stupid compilers.  */
  61 static boolean coff_arm_relocate_section
  62   PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
  63            struct internal_reloc *, struct internal_syment *, asection **));
  64 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
  65   PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
  66 static bfd_reloc_status_type aoutarm_fix_pcrel_26
  67   PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
  68 static bfd_reloc_status_type coff_thumb_pcrel_23
  69   PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
  70 static bfd_reloc_status_type coff_thumb_pcrel_12
  71   PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
  72 static bfd_reloc_status_type coff_thumb_pcrel_9
  73   PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
  74 static bfd_reloc_status_type coff_arm_reloc
  75   PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
  76 static boolean coff_arm_adjust_symndx
  77   PARAMS ((bfd *, struct bfd_link_info *, bfd *,
  78            asection *, struct internal_reloc *, boolean *));
  79 static reloc_howto_type * coff_arm_rtype_to_howto
  80   PARAMS ((bfd *, asection *, struct internal_reloc *,
  81            struct coff_link_hash_entry *, struct internal_syment *, bfd_vma *));
  82 static bfd_reloc_status_type coff_thumb_pcrel_common
  83   PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **,
  84            thumb_pcrel_branchtype));
  85 static CONST struct reloc_howto_struct * coff_arm_reloc_type_lookup
  86   PARAMS ((bfd *, bfd_reloc_code_real_type));
  87 static struct bfd_link_hash_table * coff_arm_link_hash_table_create
  88   PARAMS ((bfd *));
  89 static insn32 insert_thumb_branch
  90   PARAMS ((insn32, int));
  91 static struct coff_link_hash_entry * find_thumb_glue
  92   PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
  93 static struct coff_link_hash_entry * find_arm_glue
  94   PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
  95 #ifndef COFF_IMAGE_WITH_PE
  96 static void record_arm_to_thumb_glue
  97   PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
  98 static void record_thumb_to_arm_glue
  99   PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
 100 #endif
 101 static boolean coff_arm_merge_private_bfd_data
 102   PARAMS ((bfd *, bfd *));
 103 static boolean coff_arm_print_private_bfd_data
 104   PARAMS ((bfd *, PTR));
 105 static boolean _bfd_coff_arm_set_private_flags
 106   PARAMS ((bfd *, flagword));
 107 static boolean coff_arm_copy_private_bfd_data
 108   PARAMS ((bfd *, bfd *));
 109 static boolean coff_arm_is_local_label_name
 110   PARAMS ((bfd *, const char *));
 111 static boolean coff_arm_link_output_has_begun
 112   PARAMS ((bfd *, struct coff_final_link_info *));
 113 static boolean coff_arm_final_link_postscript
 114   PARAMS ((bfd *, struct coff_final_link_info *));
 115
 116 /* The linker script knows the section names for placement.
 117    The entry_names are used to do simple name mangling on the stubs.
 118    Given a function name, and its type, the stub can be found. The
 119    name can be changed. The only requirement is the %s be present.
 120    */
 121
 122 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
 123 #define THUMB2ARM_GLUE_ENTRY_NAME   "__%s_from_thumb"
 124
 125 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
 126 #define ARM2THUMB_GLUE_ENTRY_NAME   "__%s_from_arm"
 127
 128 /* Used by the assembler.  */
 129 static bfd_reloc_status_type
 130 coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
 131                  error_message)
 132      bfd *abfd;
 133      arelent *reloc_entry;
 134      asymbol *symbol ATTRIBUTE_UNUSED;
 135      PTR data;
 136      asection *input_section ATTRIBUTE_UNUSED;
 137      bfd *output_bfd;
 138      char **error_message ATTRIBUTE_UNUSED;
 139 {
 140   symvalue diff;
 141   if (output_bfd == (bfd *) NULL)
 142     return bfd_reloc_continue;
 143
 144   diff = reloc_entry->addend;
 145
 146 #define DOIT(x) \
 147   x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
 148
 149     if (diff != 0)
 150       {
 151         reloc_howto_type *howto = reloc_entry->howto;
 152         unsigned char *addr = (unsigned char *) data + reloc_entry->address;
 153
 154         switch (howto->size)
 155           {
 156           case 0:
 157             {
 158               char x = bfd_get_8 (abfd, addr);
 159               DOIT (x);
 160               bfd_put_8 (abfd, x, addr);
 161             }
 162             break;
 163
 164           case 1:
 165             {
 166               short x = bfd_get_16 (abfd, addr);
 167               DOIT (x);
 168               bfd_put_16 (abfd, x, addr);
 169             }
 170             break;
 171
 172           case 2:
 173             {
 174               long x = bfd_get_32 (abfd, addr);
 175               DOIT (x);
 176               bfd_put_32 (abfd, x, addr);
 177             }
 178             break;
 179
 180           default:
 181             abort ();
 182           }
 183       }
 184
 185   /* Now let bfd_perform_relocation finish everything up.  */
 186   return bfd_reloc_continue;
 187 }
 188
 189 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
 190    in this file), then TARGET_UNDERSCORE should be defined, otherwise it
 191    should not.  */
 192 #ifndef TARGET_UNDERSCORE
 193 #define TARGET_UNDERSCORE '_'
 194 #endif
 195
 196 #ifndef PCRELOFFSET
 197 #define PCRELOFFSET true
 198 #endif
 199
 200 /* These most certainly belong somewhere else. Just had to get rid of
 201    the manifest constants in the code.  */
 202 #define ARM_8        0
 203 #define ARM_16       1
 204 #define ARM_32       2
 205 #define ARM_26       3
 206 #define ARM_DISP8    4
 207 #define ARM_DISP16   5
 208 #define ARM_DISP32   6
 209 #define ARM_26D      7
 210 /* 8 is unused */
 211 #define ARM_NEG16    9
 212 #define ARM_NEG32   10
 213 #define ARM_RVA32   11
 214 #define ARM_THUMB9  12
 215 #define ARM_THUMB12 13
 216 #define ARM_THUMB23 14
 217
 218 #ifdef ARM_WINCE
 219 #undef  ARM_32
 220 #undef  ARM_RVA32
 221 #undef  ARM_26
 222 #undef  ARM_THUMB12
 223 #undef  ARM_26D
 224
 225 #define ARM_32       1
 226 #define ARM_RVA32    2
 227 #define ARM_26       3
 228 #define ARM_THUMB12  4
 229 #define ARM_26D      5
 230 #define ARM_SECTION  14
 231 #define ARM_SECREL   15
 232 #endif
 233
 234 static reloc_howto_type aoutarm_std_reloc_howto[] =
 235 {
 236   /* type              rs size bsz  pcrel bitpos ovrf                     sf name     part_inpl readmask  setmask    pcdone */
 237 #ifdef ARM_WINCE
 238   EMPTY_HOWTO (-1),
 239   HOWTO (ARM_32,
 240         0,
 241         2,
 242         32,
 243         false,
 244         0,
 245         complain_overflow_bitfield,
 246         coff_arm_reloc,
 247         "ARM_32",
 248         true,
 249         0xffffffff,
 250         0xffffffff,
 251         PCRELOFFSET),
 252   HOWTO (ARM_RVA32,
 253         0,
 254         2,
 255         32,
 256         false,
 257         0,
 258         complain_overflow_bitfield,
 259         coff_arm_reloc,
 260         "ARM_RVA32",
 261         true,
 262         0xffffffff,
 263         0xffffffff,
 264         PCRELOFFSET),
 265   HOWTO (ARM_26,
 266         2,
 267         2,
 268         24,
 269         true,
 270         0,
 271         complain_overflow_signed,
 272         aoutarm_fix_pcrel_26 ,
 273         "ARM_26",
 274         false,
 275         0x00ffffff,
 276         0x00ffffff,
 277         PCRELOFFSET),
 278   HOWTO (ARM_THUMB12,
 279         1,
 280         1,
 281         11,
 282         true,
 283         0,
 284         complain_overflow_signed,
 285         coff_thumb_pcrel_12 ,
 286         "ARM_THUMB12",
 287         false,
 288         0x000007ff,
 289         0x000007ff,
 290         PCRELOFFSET),
 291   HOWTO (ARM_26D,
 292         2,
 293         2,
 294         24,
 295         false,
 296         0,
 297         complain_overflow_dont,
 298         aoutarm_fix_pcrel_26_done,
 299         "ARM_26D",
 300         true,
 301         0x00ffffff,
 302         0x0,
 303         false),
 304   EMPTY_HOWTO (-1),
 305   EMPTY_HOWTO (-1),
 306   EMPTY_HOWTO (-1),
 307   EMPTY_HOWTO (-1),
 308   EMPTY_HOWTO (-1),
 309   EMPTY_HOWTO (-1),
 310   EMPTY_HOWTO (-1),
 311   EMPTY_HOWTO (-1),
 312   HOWTO (ARM_SECTION,
 313         0,
 314         1,
 315         16,
 316         false,
 317         0,
 318         complain_overflow_bitfield,
 319         coff_arm_reloc,
 320         "ARM_16",
 321         true,
 322         0x0000ffff,
 323         0x0000ffff,
 324         PCRELOFFSET),
 325   HOWTO (ARM_SECREL,
 326         0,
 327         2,
 328         32,
 329         false,
 330         0,
 331         complain_overflow_bitfield,
 332         coff_arm_reloc,
 333         "ARM_32",
 334         true,
 335         0xffffffff,
 336         0xffffffff,
 337         PCRELOFFSET),
 338 #else /* not ARM_WINCE */
 339   HOWTO(ARM_8,                  /* type */
 340         0,                      /* rightshift */
 341         0,                      /* size */
 342         8,                      /* bitsize */
 343         false,                  /* pc_relative */
 344         0,                      /* bitpos */
 345         complain_overflow_bitfield, /* complain_on_overflow */
 346         coff_arm_reloc,         /* special_function */
 347         "ARM_8",                /* name */
 348         true,                   /* partial_inplace */
 349         0x000000ff,             /* src_mask */
 350         0x000000ff,             /* dst_mask */
 351         PCRELOFFSET             /* pcrel_offset */),
 352   HOWTO(ARM_16,
 353         0,
 354         1,
 355         16,
 356         false,
 357         0,
 358         complain_overflow_bitfield,
 359         coff_arm_reloc,
 360         "ARM_16",
 361         true,
 362         0x0000ffff,
 363         0x0000ffff,
 364         PCRELOFFSET),
 365   HOWTO(ARM_32,
 366         0,
 367         2,
 368         32,
 369         false,
 370         0,
 371         complain_overflow_bitfield,
 372         coff_arm_reloc,
 373         "ARM_32",
 374         true,
 375         0xffffffff,
 376         0xffffffff,
 377         PCRELOFFSET),
 378   HOWTO(ARM_26,
 379         2,
 380         2,
 381         24,
 382         true,
 383         0,
 384         complain_overflow_signed,
 385         aoutarm_fix_pcrel_26 ,
 386         "ARM_26",
 387         false,
 388         0x00ffffff,
 389         0x00ffffff,
 390         PCRELOFFSET),
 391   HOWTO(ARM_DISP8,
 392         0,
 393         0,
 394         8,
 395         true,
 396         0,
 397         complain_overflow_signed,
 398         coff_arm_reloc,
 399         "ARM_DISP8",
 400         true,
 401         0x000000ff,
 402         0x000000ff,
 403         true),
 404   HOWTO( ARM_DISP16,
 405         0,
 406         1,
 407         16,
 408         true,
 409         0,
 410         complain_overflow_signed,
 411         coff_arm_reloc,
 412         "ARM_DISP16",
 413         true,
 414         0x0000ffff,
 415         0x0000ffff,
 416         true),
 417   HOWTO( ARM_DISP32,
 418         0,
 419         2,
 420         32,
 421         true,
 422         0,
 423         complain_overflow_signed,
 424         coff_arm_reloc,
 425         "ARM_DISP32",
 426         true,
 427         0xffffffff,
 428         0xffffffff,
 429         true),
 430   HOWTO( ARM_26D,
 431         2,
 432         2,
 433         24,
 434         false,
 435         0,
 436         complain_overflow_dont,
 437         aoutarm_fix_pcrel_26_done,
 438         "ARM_26D",
 439         true,
 440         0x00ffffff,
 441         0x0,
 442         false),
 443   /* 8 is unused */
 444   EMPTY_HOWTO (-1),
 445   HOWTO( ARM_NEG16,
 446         0,
 447         -1,
 448         16,
 449         false,
 450         0,
 451         complain_overflow_bitfield,
 452         coff_arm_reloc,
 453         "ARM_NEG16",
 454         true,
 455         0x0000ffff,
 456         0x0000ffff,
 457         false),
 458   HOWTO( ARM_NEG32,
 459         0,
 460         -2,
 461         32,
 462         false,
 463         0,
 464         complain_overflow_bitfield,
 465         coff_arm_reloc,
 466         "ARM_NEG32",
 467         true,
 468         0xffffffff,
 469         0xffffffff,
 470         false),
 471   HOWTO( ARM_RVA32,
 472         0,
 473         2,
 474         32,
 475         false,
 476         0,
 477         complain_overflow_bitfield,
 478         coff_arm_reloc,
 479         "ARM_RVA32",
 480         true,
 481         0xffffffff,
 482         0xffffffff,
 483         PCRELOFFSET),
 484   HOWTO( ARM_THUMB9,
 485         1,
 486         1,
 487         8,
 488         true,
 489         0,
 490         complain_overflow_signed,
 491         coff_thumb_pcrel_9 ,
 492         "ARM_THUMB9",
 493         false,
 494         0x000000ff,
 495         0x000000ff,
 496         PCRELOFFSET),
 497   HOWTO( ARM_THUMB12,
 498         1,
 499         1,
 500         11,
 501         true,
 502         0,
 503         complain_overflow_signed,
 504         coff_thumb_pcrel_12 ,
 505         "ARM_THUMB12",
 506         false,
 507         0x000007ff,
 508         0x000007ff,
 509         PCRELOFFSET),
 510   HOWTO( ARM_THUMB23,
 511         1,
 512         2,
 513         22,
 514         true,
 515         0,
 516         complain_overflow_signed,
 517         coff_thumb_pcrel_23 ,
 518         "ARM_THUMB23",
 519         false,
 520         0x07ff07ff,
 521         0x07ff07ff,
 522         PCRELOFFSET)
 523 #endif /* not ARM_WINCE */
 524 };
 525
 526 #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
 527
 528 #ifdef COFF_WITH_PE
 529 /* Return true if this relocation should
 530    appear in the output .reloc section.  */
 531
 532 static boolean
 533 in_reloc_p (abfd, howto)
 534      bfd * abfd ATTRIBUTE_UNUSED;
 535      reloc_howto_type * howto;
 536 {
 537   return !howto->pc_relative && howto->type != ARM_RVA32;
 538 }
 539 #endif
 540
 541 #define RTYPE2HOWTO(cache_ptr, dst)             \
 542   (cache_ptr)->howto =                          \
 543     (dst)->r_type < NUM_RELOCS                  \
 544     ? aoutarm_std_reloc_howto + (dst)->r_type   \
 545     : NULL
 546
 547 #define coff_rtype_to_howto coff_arm_rtype_to_howto
 548
 549 static reloc_howto_type *
 550 coff_arm_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
 551      bfd *abfd ATTRIBUTE_UNUSED;
 552      asection *sec;
 553      struct internal_reloc *rel;
 554      struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
 555      struct internal_syment *sym ATTRIBUTE_UNUSED;
 556      bfd_vma *addendp;
 557 {
 558   reloc_howto_type * howto;
 559
 560   if (rel->r_type >= NUM_RELOCS)
 561     return NULL;
 562
 563   howto = aoutarm_std_reloc_howto + rel->r_type;
 564
 565   if (rel->r_type == ARM_RVA32)
 566     *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
 567
 568   return howto;
 569 }
 570 /* Used by the assembler.  */
 571
 572 static bfd_reloc_status_type
 573 aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
 574                           output_bfd, error_message)
 575      bfd *abfd ATTRIBUTE_UNUSED;
 576      arelent *reloc_entry ATTRIBUTE_UNUSED;
 577      asymbol *symbol ATTRIBUTE_UNUSED;
 578      PTR data ATTRIBUTE_UNUSED;
 579      asection *input_section ATTRIBUTE_UNUSED;
 580      bfd *output_bfd ATTRIBUTE_UNUSED;
 581      char **error_message ATTRIBUTE_UNUSED;
 582 {
 583   /* This is dead simple at present.  */
 584   return bfd_reloc_ok;
 585 }
 586
 587 /* Used by the assembler.  */
 588
 589 static bfd_reloc_status_type
 590 aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
 591                      output_bfd, error_message)
 592      bfd *abfd;
 593      arelent *reloc_entry;
 594      asymbol *symbol;
 595      PTR data;
 596      asection *input_section;
 597      bfd *output_bfd;
 598      char **error_message ATTRIBUTE_UNUSED;
 599 {
 600   bfd_vma relocation;
 601   bfd_size_type addr = reloc_entry->address;
 602   long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
 603   bfd_reloc_status_type flag = bfd_reloc_ok;
 604
 605   /* If this is an undefined symbol, return error */
 606   if (symbol->section == &bfd_und_section
 607       && (symbol->flags & BSF_WEAK) == 0)
 608     return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
 609
 610   /* If the sections are different, and we are doing a partial relocation,
 611      just ignore it for now.  */
 612   if (symbol->section->name != input_section->name
 613       && output_bfd != (bfd *)NULL)
 614     return bfd_reloc_continue;
 615
 616   relocation = (target & 0x00ffffff) << 2;
 617   relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend */
 618   relocation += symbol->value;
 619   relocation += symbol->section->output_section->vma;
 620   relocation += symbol->section->output_offset;
 621   relocation += reloc_entry->addend;
 622   relocation -= input_section->output_section->vma;
 623   relocation -= input_section->output_offset;
 624   relocation -= addr;
 625
 626   if (relocation & 3)
 627     return bfd_reloc_overflow;
 628
 629   /* Check for overflow */
 630   if (relocation & 0x02000000)
 631     {
 632       if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
 633         flag = bfd_reloc_overflow;
 634     }
 635   else if (relocation & ~0x03ffffff)
 636     flag = bfd_reloc_overflow;
 637
 638   target &= ~0x00ffffff;
 639   target |= (relocation >> 2) & 0x00ffffff;
 640   bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
 641
 642   /* Now the ARM magic... Change the reloc type so that it is marked as done.
 643      Strictly this is only necessary if we are doing a partial relocation.  */
 644   reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
 645
 646   return flag;
 647 }
 648
 649 static bfd_reloc_status_type
 650 coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, input_section,
 651                      output_bfd, error_message, btype)
 652      bfd *abfd;
 653      arelent *reloc_entry;
 654      asymbol *symbol;
 655      PTR data;
 656      asection *input_section;
 657      bfd *output_bfd;
 658      char **error_message ATTRIBUTE_UNUSED;
 659      thumb_pcrel_branchtype btype;
 660 {
 661   bfd_vma relocation = 0;
 662   bfd_size_type addr = reloc_entry->address;
 663   long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
 664   bfd_reloc_status_type flag = bfd_reloc_ok;
 665   bfd_vma dstmsk;
 666   bfd_vma offmsk;
 667   bfd_vma signbit;
 668
 669   /* NOTE: This routine is currently used by GAS, but not by the link
 670      phase.  */
 671
 672   switch (btype)
 673     {
 674     case b9:
 675       dstmsk  = 0x000000ff;
 676       offmsk  = 0x000001fe;
 677       signbit = 0x00000100;
 678       break;
 679
 680     case b12:
 681       dstmsk  = 0x000007ff;
 682       offmsk  = 0x00000ffe;
 683       signbit = 0x00000800;
 684       break;
 685
 686     case b23:
 687       dstmsk  = 0x07ff07ff;
 688       offmsk  = 0x007fffff;
 689       signbit = 0x00400000;
 690       break;
 691
 692     default:
 693       abort ();
 694     }
 695
 696   /* If this is an undefined symbol, return error */
 697   if (symbol->section == &bfd_und_section
 698       && (symbol->flags & BSF_WEAK) == 0)
 699     return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
 700
 701   /* If the sections are different, and we are doing a partial relocation,
 702      just ignore it for now.  */
 703   if (symbol->section->name != input_section->name
 704       && output_bfd != (bfd *)NULL)
 705     return bfd_reloc_continue;
 706
 707   switch (btype)
 708     {
 709     case b9:
 710     case b12:
 711       relocation = ((target & dstmsk) << 1);
 712       break;
 713
 714     case b23:
 715       if (bfd_big_endian (abfd))
 716         relocation = ((target & 0x7ff) << 1)  | ((target & 0x07ff0000) >> 4);
 717       else
 718         relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
 719       break;
 720
 721     default:
 722       abort ();
 723     }
 724
 725   relocation = (relocation ^ signbit) - signbit; /* Sign extend */
 726   relocation += symbol->value;
 727   relocation += symbol->section->output_section->vma;
 728   relocation += symbol->section->output_offset;
 729   relocation += reloc_entry->addend;
 730   relocation -= input_section->output_section->vma;
 731   relocation -= input_section->output_offset;
 732   relocation -= addr;
 733
 734   if (relocation & 1)
 735     return bfd_reloc_overflow;
 736
 737   /* Check for overflow */
 738   if (relocation & signbit)
 739     {
 740       if ((relocation & ~offmsk) != ~offmsk)
 741         flag = bfd_reloc_overflow;
 742     }
 743   else if (relocation & ~offmsk)
 744     flag = bfd_reloc_overflow;
 745
 746   target &= ~dstmsk;
 747   switch (btype)
 748    {
 749    case b9:
 750    case b12:
 751      target |= (relocation >> 1);
 752      break;
 753
 754    case b23:
 755      if (bfd_big_endian (abfd))
 756        target |= ((relocation & 0xfff) >> 1)  | ((relocation << 4)  & 0x07ff0000);
 757      else
 758        target |= ((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff);
 759      break;
 760
 761    default:
 762      abort ();
 763    }
 764
 765   bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
 766
 767   /* Now the ARM magic... Change the reloc type so that it is marked as done.
 768      Strictly this is only necessary if we are doing a partial relocation.  */
 769   reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
 770
 771   /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations */
 772   return flag;
 773 }
 774
 775 static bfd_reloc_status_type
 776 coff_thumb_pcrel_23 (abfd, reloc_entry, symbol, data, input_section,
 777                      output_bfd, error_message)
 778      bfd *abfd;
 779      arelent *reloc_entry;
 780      asymbol *symbol;
 781      PTR data;
 782      asection *input_section;
 783      bfd *output_bfd;
 784      char **error_message;
 785 {
 786   return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
 787                                   input_section, output_bfd, error_message, b23);
 788 }
 789
 790 static bfd_reloc_status_type
 791 coff_thumb_pcrel_12 (abfd, reloc_entry, symbol, data, input_section,
 792                      output_bfd, error_message)
 793      bfd *abfd;
 794      arelent *reloc_entry;
 795      asymbol *symbol;
 796      PTR data;
 797      asection *input_section;
 798      bfd *output_bfd;
 799      char **error_message;
 800 {
 801   return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
 802                                   input_section, output_bfd, error_message, b12);
 803 }
 804
 805 static bfd_reloc_status_type
 806 coff_thumb_pcrel_9 (abfd, reloc_entry, symbol, data, input_section,
 807                      output_bfd, error_message)
 808      bfd *abfd;
 809      arelent *reloc_entry;
 810      asymbol *symbol;
 811      PTR data;
 812      asection *input_section;
 813      bfd *output_bfd;
 814      char **error_message;
 815 {
 816   return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
 817                                   input_section, output_bfd, error_message, b9);
 818 }
 819
 820 static CONST struct reloc_howto_struct *
 821 coff_arm_reloc_type_lookup (abfd, code)
 822       bfd * abfd;
 823       bfd_reloc_code_real_type code;
 824 {
 825 #define ASTD(i,j)       case i: return aoutarm_std_reloc_howto + j
 826
 827   if (code == BFD_RELOC_CTOR)
 828     switch (bfd_get_arch_info (abfd)->bits_per_address)
 829       {
 830       case 32:
 831         code = BFD_RELOC_32;
 832         break;
 833       default: return (CONST struct reloc_howto_struct *) 0;
 834       }
 835
 836   switch (code)
 837     {
 838 #ifdef ARM_WINCE
 839       ASTD (BFD_RELOC_32,                   ARM_32);
 840       ASTD (BFD_RELOC_RVA,                  ARM_RVA32);
 841       ASTD (BFD_RELOC_ARM_PCREL_BRANCH,     ARM_26);
 842       ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
 843 #else
 844       ASTD (BFD_RELOC_8,                    ARM_8);
 845       ASTD (BFD_RELOC_16,                   ARM_16);
 846       ASTD (BFD_RELOC_32,                   ARM_32);
 847       ASTD (BFD_RELOC_ARM_PCREL_BRANCH,     ARM_26);
 848       ASTD (BFD_RELOC_ARM_PCREL_BLX,        ARM_26);
 849       ASTD (BFD_RELOC_8_PCREL,              ARM_DISP8);
 850       ASTD (BFD_RELOC_16_PCREL,             ARM_DISP16);
 851       ASTD (BFD_RELOC_32_PCREL,             ARM_DISP32);
 852       ASTD (BFD_RELOC_RVA,                  ARM_RVA32);
 853       ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9,  ARM_THUMB9);
 854       ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
 855       ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
 856 #endif
 857     default: return (CONST struct reloc_howto_struct *) 0;
 858     }
 859 }
 860
 861 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
 862 #define COFF_PAGE_SIZE 0x1000
 863 /* Turn a howto into a reloc  nunmber */
 864
 865 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
 866 #define BADMAG(x) ARMBADMAG(x)
 867 #define ARM 1                   /* Customize coffcode.h */
 868
 869 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
 870    This allows us to store global data here without actually creating any
 871    global variables, which is a no-no in the BFD world.  */
 872 struct coff_arm_link_hash_table
 873 {
 874   /* The original coff_link_hash_table structure.  MUST be first field.  */
 875   struct coff_link_hash_table   root;
 876
 877   /* The size in bytes of the section containg the Thumb-to-ARM glue.  */
 878   long int                      thumb_glue_size;
 879
 880   /* The size in bytes of the section containg the ARM-to-Thumb glue.  */
 881   long int                      arm_glue_size;
 882
 883   /* An arbitary input BFD chosen to hold the glue sections.  */
 884   bfd *                         bfd_of_glue_owner;
 885
 886   /* Support interworking with old, non-interworking aware ARM code.  */
 887   int                           support_old_code;
 888 };
 889
 890 /* Get the ARM coff linker hash table from a link_info structure.  */
 891 #define coff_arm_hash_table(info) \
 892   ((struct coff_arm_link_hash_table *) ((info)->hash))
 893
 894 /* Create an ARM coff linker hash table.  */
 895
 896 static struct bfd_link_hash_table *
 897 coff_arm_link_hash_table_create (abfd)
 898      bfd * abfd;
 899 {
 900   struct coff_arm_link_hash_table * ret;
 901
 902   ret = ((struct coff_arm_link_hash_table *)
 903          bfd_alloc (abfd, sizeof (struct coff_arm_link_hash_table)));
 904   if (ret == (struct coff_arm_link_hash_table *) NULL)
 905     return NULL;
 906
 907   if (! _bfd_coff_link_hash_table_init
 908       (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
 909     {
 910       bfd_release (abfd, ret);
 911       return (struct bfd_link_hash_table *) NULL;
 912     }
 913
 914   ret->thumb_glue_size   = 0;
 915   ret->arm_glue_size     = 0;
 916   ret->bfd_of_glue_owner = NULL;
 917
 918   return & ret->root.root;
 919 }
 920
 921 static void
 922 arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
 923       struct bfd_link_info *info;
 924       bfd *output_bfd;
 925       asection *input_section;
 926       bfd_vma reloc_offset;
 927 {
 928   bfd_vma addr = reloc_offset
 929                 - input_section->vma
 930                 + input_section->output_offset
 931                   + input_section->output_section->vma;
 932
 933   if (coff_data(output_bfd)->pe)
 934      addr -= pe_data(output_bfd)->pe_opthdr.ImageBase;
 935   fwrite (&addr, 1, sizeof (addr), (FILE *) info->base_file);
 936
 937 }
 938 \f
 939 /* The thumb form of a long branch is a bit finicky, because the offset
 940    encoding is split over two fields, each in it's own instruction. They
 941    can occur in any order. So given a thumb form of long branch, and an
 942    offset, insert the offset into the thumb branch and return finished
 943    instruction.
 944
 945    It takes two thumb instructions to encode the target address. Each has
 946    11 bits to invest. The upper 11 bits are stored in one (identifed by
 947    H-0.. see below), the lower 11 bits are stored in the other (identified
 948    by H-1).
 949
 950    Combine together and shifted left by 1 (it's a half word address) and
 951    there you have it.
 952
 953      Op: 1111 = F,
 954      H-0, upper address-0 = 000
 955      Op: 1111 = F,
 956      H-1, lower address-0 = 800
 957
 958    They can be ordered either way, but the arm tools I've seen always put
 959    the lower one first. It probably doesn't matter. krk@cygnus.com
 960
 961    XXX:  Actually the order does matter.  The second instruction (H-1)
 962    moves the computed address into the PC, so it must be the second one
 963    in the sequence.  The problem, however is that whilst little endian code
 964    stores the instructions in HI then LOW order, big endian code does the
 965    reverse.  nickc@cygnus.com  */
 966
 967 #define LOW_HI_ORDER 0xF800F000
 968 #define HI_LOW_ORDER 0xF000F800
 969
 970 static insn32
 971 insert_thumb_branch (br_insn, rel_off)
 972      insn32 br_insn;
 973      int rel_off;
 974 {
 975   unsigned int low_bits;
 976   unsigned int high_bits;
 977
 978   BFD_ASSERT((rel_off & 1) != 1);
 979
 980   rel_off >>= 1;                              /* half word aligned address */
 981   low_bits = rel_off & 0x000007FF;            /* the bottom 11 bits */
 982   high_bits = (rel_off >> 11) & 0x000007FF;   /* the top 11 bits */
 983
 984   if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
 985     br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
 986   else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
 987     br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
 988   else
 989     abort (); /* error - not a valid branch instruction form */
 990
 991   /* FIXME: abort is probably not the right call. krk@cygnus.com */
 992
 993   return br_insn;
 994 }
 995
 996 \f
 997 static struct coff_link_hash_entry *
 998 find_thumb_glue (info, name, input_bfd)
 999      struct bfd_link_info * info;
1000      CONST char *           name;
1001      bfd *                  input_bfd;
1002 {
1003   char *                        tmp_name;
1004   struct coff_link_hash_entry * myh;
1005
1006   tmp_name = ((char *)
1007          bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1));
1008
1009   BFD_ASSERT (tmp_name);
1010
1011   sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1012
1013   myh = coff_link_hash_lookup
1014     (coff_hash_table (info), tmp_name, false, false, true);
1015
1016   if (myh == NULL)
1017     /* xgettext:c-format */
1018     _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
1019                         bfd_get_filename (input_bfd), tmp_name, name);
1020
1021   free (tmp_name);
1022
1023   return myh;
1024 }
1025
1026 static struct coff_link_hash_entry *
1027 find_arm_glue (info, name, input_bfd)
1028      struct bfd_link_info * info;
1029      CONST char *           name;
1030      bfd *                  input_bfd;
1031 {
1032   char *                        tmp_name;
1033   struct coff_link_hash_entry * myh;
1034
1035   tmp_name = ((char *)
1036               bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1037
1038   BFD_ASSERT (tmp_name);
1039
1040   sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1041
1042   myh = coff_link_hash_lookup
1043     (coff_hash_table (info), tmp_name, false, false, true);
1044
1045   if (myh == NULL)
1046     /* xgettext:c-format */
1047     _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
1048                         bfd_get_filename (input_bfd), tmp_name, name);
1049
1050   free (tmp_name);
1051
1052   return myh;
1053 }
1054
1055 /*
1056   ARM->Thumb glue:
1057
1058        .arm
1059        __func_from_arm:
1060              ldr r12, __func_addr
1061              bx  r12
1062        __func_addr:
1063             .word func    @ behave as if you saw a ARM_32 reloc
1064 */
1065
1066 #define ARM2THUMB_GLUE_SIZE 12
1067 static const insn32 a2t1_ldr_insn       = 0xe59fc000;
1068 static const insn32 a2t2_bx_r12_insn    = 0xe12fff1c;
1069 static const insn32 a2t3_func_addr_insn = 0x00000001;
1070
1071 /*
1072    Thumb->ARM:                          Thumb->(non-interworking aware) ARM
1073
1074    .thumb                               .thumb
1075    .align 2                             .align 2
1076       __func_from_thumb:                   __func_from_thumb:
1077            bx pc                                push {r6, lr}
1078            nop                                  ldr  r6, __func_addr
1079    .arm                                         mov  lr, pc
1080       __func_change_to_arm:                     bx   r6
1081            b func                       .arm
1082                                            __func_back_to_thumb:
1083                                                 ldmia r13! {r6, lr}
1084                                                 bx    lr
1085                                            __func_addr:
1086                                                 .word   func
1087 */
1088
1089 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1090 static const insn16 t2a1_bx_pc_insn = 0x4778;
1091 static const insn16 t2a2_noop_insn  = 0x46c0;
1092 static const insn32 t2a3_b_insn     = 0xea000000;
1093
1094 static const insn16 t2a1_push_insn  = 0xb540;
1095 static const insn16 t2a2_ldr_insn   = 0x4e03;
1096 static const insn16 t2a3_mov_insn   = 0x46fe;
1097 static const insn16 t2a4_bx_insn    = 0x4730;
1098 static const insn32 t2a5_pop_insn   = 0xe8bd4040;
1099 static const insn32 t2a6_bx_insn    = 0xe12fff1e;
1100
1101 /* TODO:
1102      We should really create new local (static) symbols in destination
1103      object for each stub we create.  We should also create local
1104      (static) symbols within the stubs when switching between ARM and
1105      Thumb code.  This will ensure that the debugger and disassembler
1106      can present a better view of stubs.
1107
1108      We can treat stubs like literal sections, and for the THUMB9 ones
1109      (short addressing range) we should be able to insert the stubs
1110      between sections. i.e. the simplest approach (since relocations
1111      are done on a section basis) is to dump the stubs at the end of
1112      processing a section. That way we can always try and minimise the
1113      offset to and from a stub. However, this does not map well onto
1114      the way that the linker/BFD does its work: mapping all input
1115      sections to output sections via the linker script before doing
1116      all the processing.
1117
1118      Unfortunately it may be easier to just to disallow short range
1119      Thumb->ARM stubs (i.e. no conditional inter-working branches,
1120      only branch-and-link (BL) calls.  This will simplify the processing
1121      since we can then put all of the stubs into their own section.
1122
1123   TODO:
1124      On a different subject, rather than complaining when a
1125      branch cannot fit in the number of bits available for the
1126      instruction we should generate a trampoline stub (needed to
1127      address the complete 32bit address space).  */
1128
1129 /* The standard COFF backend linker does not cope with the special
1130    Thumb BRANCH23 relocation.  The alternative would be to split the
1131    BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1132    bit simpler simply providing our own relocation driver.  */
1133
1134 /* The reloc processing routine for the ARM/Thumb COFF linker.  NOTE:
1135    This code is a very slightly modified copy of
1136    _bfd_coff_generic_relocate_section.  It would be a much more
1137    maintainable solution to have a MACRO that could be expanded within
1138    _bfd_coff_generic_relocate_section that would only be provided for
1139    ARM/Thumb builds.  It is only the code marked THUMBEXTENSION that
1140    is different from the original.  */
1141
1142 static boolean
1143 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1144                            contents, relocs, syms, sections)
1145      bfd *output_bfd;
1146      struct bfd_link_info *info;
1147      bfd *input_bfd;
1148      asection *input_section;
1149      bfd_byte *contents;
1150      struct internal_reloc *relocs;
1151      struct internal_syment *syms;
1152      asection **sections;
1153 {
1154   struct internal_reloc * rel;
1155   struct internal_reloc * relend;
1156
1157   rel = relocs;
1158   relend = rel + input_section->reloc_count;
1159
1160   for (; rel < relend; rel++)
1161     {
1162       int                            done = 0;
1163       long                           symndx;
1164       struct coff_link_hash_entry *  h;
1165       struct internal_syment *       sym;
1166       bfd_vma                        addend;
1167       bfd_vma                        val;
1168       reloc_howto_type *             howto;
1169       bfd_reloc_status_type          rstat;
1170       bfd_vma                        h_val;
1171
1172       symndx = rel->r_symndx;
1173
1174       if (symndx == -1)
1175         {
1176           h = NULL;
1177           sym = NULL;
1178         }
1179       else
1180         {
1181           h = obj_coff_sym_hashes (input_bfd)[symndx];
1182           sym = syms + symndx;
1183         }
1184
1185       /* COFF treats common symbols in one of two ways.  Either the
1186          size of the symbol is included in the section contents, or it
1187          is not.  We assume that the size is not included, and force
1188          the rtype_to_howto function to adjust the addend as needed.  */
1189
1190       if (sym != NULL && sym->n_scnum != 0)
1191         addend = - sym->n_value;
1192       else
1193         addend = 0;
1194
1195       howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1196                                        sym, &addend);
1197       if (howto == NULL)
1198         return false;
1199
1200       /* The relocation_section function will skip pcrel_offset relocs
1201          when doing a relocateable link.  However, we want to convert
1202          ARM26 to ARM26D relocs if possible.  We return a fake howto in
1203          this case without pcrel_offset set, and adjust the addend to
1204          compensate.  */
1205       if (rel->r_type == ARM_26
1206           && h != NULL
1207           && info->relocateable
1208           && (h->root.type == bfd_link_hash_defined
1209               || h->root.type == bfd_link_hash_defweak)
1210           && h->root.u.def.section->output_section == input_section->output_section)
1211         {
1212           static reloc_howto_type fake_arm26_reloc =
1213             HOWTO (ARM_26,
1214                2,
1215                2,
1216                24,
1217                true,
1218                0,
1219                complain_overflow_signed,
1220                aoutarm_fix_pcrel_26 ,
1221                "ARM_26",
1222                false,
1223                0x00ffffff,
1224                0x00ffffff,
1225                false);
1226
1227           addend -= rel->r_vaddr - input_section->vma;
1228           howto = &fake_arm26_reloc;
1229         }
1230
1231 #ifdef ARM_WINCE
1232       /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1233          the next opcode's pc, so is off by one.  */
1234       if (howto->pc_relative && !info->relocateable)
1235         addend -= 8;
1236 #endif
1237
1238       /* If we are doing a relocateable link, then we can just ignore
1239          a PC relative reloc that is pcrel_offset.  It will already
1240          have the correct value.  If this is not a relocateable link,
1241          then we should ignore the symbol value.  */
1242       if (howto->pc_relative && howto->pcrel_offset)
1243         {
1244           if (info->relocateable)
1245             continue;
1246 #if 0  /* We must not ignore the symbol value.  If the symbol is
1247           within the same section, the relocation should have already
1248           been fixed, but if it is not, we'll be handed a reloc into
1249           the beginning of the symbol's section, so we must not cancel
1250           out the symbol's value, otherwise we'll be adding it in
1251           twice.  */
1252           if (sym != NULL && sym->n_scnum != 0)
1253             addend += sym->n_value;
1254 #endif
1255         }
1256
1257       val = 0;
1258
1259       if (h == NULL)
1260         {
1261           asection *sec;
1262
1263           if (symndx == -1)
1264             {
1265               sec = bfd_abs_section_ptr;
1266               val = 0;
1267             }
1268           else
1269             {
1270               sec = sections[symndx];
1271               val = (sec->output_section->vma
1272                      + sec->output_offset
1273                      + sym->n_value
1274                      - sec->vma);
1275             }
1276         }
1277       else
1278         {
1279 #if 1 /* THUMBEXTENSION */
1280           /* We don't output the stubs if we are generating a
1281              relocatable output file, since we may as well leave the
1282              stub generation to the final linker pass. If we fail to
1283              verify that the name is defined, we'll try to build stubs
1284              for an undefined name...  */
1285           if (! info->relocateable
1286               && (   h->root.type == bfd_link_hash_defined
1287                   || h->root.type == bfd_link_hash_defweak))
1288             {
1289               asection *   h_sec = h->root.u.def.section;
1290               const char * name  = h->root.root.string;
1291
1292               /* h locates the symbol referenced in the reloc.  */
1293               h_val = (h->root.u.def.value
1294                        + h_sec->output_section->vma
1295                        + h_sec->output_offset);
1296
1297               if (howto->type == ARM_26)
1298                 {
1299                   if (   h->class == C_THUMBSTATFUNC
1300                       || h->class == C_THUMBEXTFUNC)
1301                     {
1302                       /* Arm code calling a Thumb function */
1303                       unsigned long int                 tmp;
1304                       long int                          my_offset;
1305                       asection *                        s;
1306                       long int                          ret_offset;
1307                       struct coff_link_hash_entry *     myh;
1308                       struct coff_arm_link_hash_table * globals;
1309
1310                       myh = find_arm_glue (info, name, input_bfd);
1311                       if (myh == NULL)
1312                         return false;
1313
1314                       globals = coff_arm_hash_table (info);
1315
1316                       BFD_ASSERT (globals != NULL);
1317                       BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1318
1319                       my_offset = myh->root.u.def.value;
1320
1321                       s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1322                                                   ARM2THUMB_GLUE_SECTION_NAME);
1323                       BFD_ASSERT (s != NULL);
1324                       BFD_ASSERT (s->contents != NULL);
1325                       BFD_ASSERT (s->output_section != NULL);
1326
1327                       if ((my_offset & 0x01) == 0x01)
1328                         {
1329                           if (h_sec->owner != NULL
1330                               && INTERWORK_SET (h_sec->owner)
1331                               && ! INTERWORK_FLAG (h_sec->owner))
1332                             {
1333                               _bfd_error_handler
1334                                 /* xgettext:c-format */
1335                                 (_("%s(%s): warning: interworking not enabled."),
1336                                  bfd_get_filename (h_sec->owner), name);
1337                               _bfd_error_handler
1338                                 /* xgettext:c-format */
1339                                 (_("  first occurrence: %s: arm call to thumb"),
1340                                  bfd_get_filename (input_bfd));
1341                             }
1342
1343                           --my_offset;
1344                           myh->root.u.def.value = my_offset;
1345
1346                           bfd_put_32 (output_bfd, a2t1_ldr_insn,
1347                                       s->contents + my_offset);
1348
1349                           bfd_put_32 (output_bfd, a2t2_bx_r12_insn,
1350                                       s->contents + my_offset + 4);
1351
1352                           /* It's a thumb address.  Add the low order bit.  */
1353                           bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1354                                       s->contents + my_offset + 8);
1355
1356                           if (info->base_file)
1357                             arm_emit_base_file_entry (info, output_bfd, s,
1358                                                             my_offset + 8);
1359
1360                         }
1361
1362                       BFD_ASSERT (my_offset <= globals->arm_glue_size);
1363
1364                       tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1365                                         - input_section->vma);
1366
1367                       tmp = tmp & 0xFF000000;
1368
1369                       /* Somehow these are both 4 too far, so subtract 8.  */
1370                       ret_offset =
1371                         s->output_offset
1372                         + my_offset
1373                         + s->output_section->vma
1374                         - (input_section->output_offset
1375                            + input_section->output_section->vma
1376                            + rel->r_vaddr)
1377                         - 8;
1378
1379                       tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1380
1381                       bfd_put_32 (output_bfd, tmp, contents + rel->r_vaddr
1382                                   - input_section->vma);
1383                       done = 1;
1384                     }
1385                 }
1386
1387 #ifndef ARM_WINCE
1388               /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12 */
1389               else if (howto->type == ARM_THUMB23)
1390                 {
1391                   if (   h->class == C_EXT
1392                       || h->class == C_STAT
1393                       || h->class == C_LABEL)
1394                     {
1395                       /* Thumb code calling an ARM function */
1396                       asection *                         s = 0;
1397                       long int                           my_offset;
1398                       unsigned long int                  tmp;
1399                       long int                           ret_offset;
1400                       struct coff_link_hash_entry *      myh;
1401                       struct coff_arm_link_hash_table *  globals;
1402
1403                       myh = find_thumb_glue (info, name, input_bfd);
1404                       if (myh == NULL)
1405                         return false;
1406
1407                       globals = coff_arm_hash_table (info);
1408
1409                       BFD_ASSERT (globals != NULL);
1410                       BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1411
1412                       my_offset = myh->root.u.def.value;
1413
1414                       s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1415                                                    THUMB2ARM_GLUE_SECTION_NAME);
1416
1417                       BFD_ASSERT (s != NULL);
1418                       BFD_ASSERT (s->contents != NULL);
1419                       BFD_ASSERT (s->output_section != NULL);
1420
1421                       if ((my_offset & 0x01) == 0x01)
1422                         {
1423                           if (h_sec->owner != NULL
1424                               && INTERWORK_SET (h_sec->owner)
1425                               && ! INTERWORK_FLAG (h_sec->owner)
1426                               && ! globals->support_old_code)
1427                             {
1428                               _bfd_error_handler
1429                                 /* xgettext:c-format */
1430                                 (_("%s(%s): warning: interworking not enabled."),
1431                                  bfd_get_filename (h_sec->owner), name);
1432                               _bfd_error_handler
1433                                 /* xgettext:c-format */
1434                                 (_("  first occurrence: %s: thumb call to arm"),
1435                                  bfd_get_filename (input_bfd));
1436                               _bfd_error_handler
1437                                 (_("  consider relinking with --support-old-code enabled"));
1438                             }
1439
1440                           -- my_offset;
1441                           myh->root.u.def.value = my_offset;
1442
1443                           if (globals->support_old_code)
1444                             {
1445                               bfd_put_16 (output_bfd, t2a1_push_insn,
1446                                           s->contents + my_offset);
1447
1448                               bfd_put_16 (output_bfd, t2a2_ldr_insn,
1449                                           s->contents + my_offset + 2);
1450
1451                               bfd_put_16 (output_bfd, t2a3_mov_insn,
1452                                           s->contents + my_offset + 4);
1453
1454                               bfd_put_16 (output_bfd, t2a4_bx_insn,
1455                                           s->contents + my_offset + 6);
1456
1457                               bfd_put_32 (output_bfd, t2a5_pop_insn,
1458                                           s->contents + my_offset + 8);
1459
1460                               bfd_put_32 (output_bfd, t2a6_bx_insn,
1461                                           s->contents + my_offset + 12);
1462
1463                               /* Store the address of the function in the last word of the stub.  */
1464                               bfd_put_32 (output_bfd, h_val,
1465                                           s->contents + my_offset + 16);
1466
1467                               if (info->base_file)
1468                                 arm_emit_base_file_entry (info, output_bfd, s, my_offset + 16);
1469                             }
1470                           else
1471                             {
1472                               bfd_put_16 (output_bfd, t2a1_bx_pc_insn,
1473                                           s->contents + my_offset);
1474
1475                               bfd_put_16 (output_bfd, t2a2_noop_insn,
1476                                           s->contents + my_offset + 2);
1477
1478                               ret_offset =
1479                                 ((bfd_signed_vma) h_val)        /* Address of destination of the stub */
1480                                 - ((bfd_signed_vma)
1481                                    (s->output_offset            /* Offset from the start of the current section to the start of the stubs.  */
1482                                     + my_offset                 /* Offset of the start of this stub from the start of the stubs.  */
1483                                     + s->output_section->vma)   /* Address of the start of the current section.  */
1484                                    + 4                          /* The branch instruction is 4 bytes into the stub.  */
1485                                    + 8);                        /* ARM branches work from the pc of the instruction + 8.  */
1486
1487                               bfd_put_32 (output_bfd,
1488                                           t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1489                                           s->contents + my_offset + 4);
1490
1491                             }
1492                         }
1493
1494                       BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1495
1496                       /* Now go back and fix up the original BL insn to point
1497                          to here.  */
1498                       ret_offset =
1499                         s->output_offset
1500                         + my_offset
1501                         - (input_section->output_offset
1502                            + rel->r_vaddr)
1503                         -4;
1504
1505                       tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1506                                         - input_section->vma);
1507
1508                       bfd_put_32 (output_bfd,
1509                                   insert_thumb_branch (tmp, ret_offset),
1510                                   contents + rel->r_vaddr
1511                                   - input_section->vma);
1512
1513                       done = 1;
1514                     }
1515                 }
1516 #endif
1517             }
1518
1519           /* If the relocation type and destination symbol does not
1520              fall into one of the above categories, then we can just
1521              perform a direct link.  */
1522
1523           if (done)
1524             rstat = bfd_reloc_ok;
1525           else
1526 #endif /* THUMBEXTENSION */
1527             if (   h->root.type == bfd_link_hash_defined
1528                 || h->root.type == bfd_link_hash_defweak)
1529             {
1530               asection *sec;
1531
1532               sec = h->root.u.def.section;
1533               val = (h->root.u.def.value
1534                      + sec->output_section->vma
1535                      + sec->output_offset);
1536               }
1537
1538           else if (! info->relocateable)
1539             {
1540               if (! ((*info->callbacks->undefined_symbol)
1541                      (info, h->root.root.string, input_bfd, input_section,
1542                       rel->r_vaddr - input_section->vma, true)))
1543                 return false;
1544             }
1545         }
1546
1547       if (info->base_file)
1548         {
1549           /* Emit a reloc if the backend thinks it needs it.  */
1550           if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1551             arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
1552         }
1553
1554 #if 1 /* THUMBEXTENSION */
1555       if (done)
1556         rstat = bfd_reloc_ok;
1557 #ifndef ARM_WINCE
1558       /* Only perform this fix during the final link, not a relocatable link.  nickc@cygnus.com  */
1559       else if (! info->relocateable
1560                && howto->type == ARM_THUMB23)
1561         {
1562           /* This is pretty much a copy of what the default
1563              _bfd_final_link_relocate and _bfd_relocate_contents
1564              routines do to perform a relocation, with special
1565              processing for the split addressing of the Thumb BL
1566              instruction.  Again, it would probably be simpler adding a
1567              ThumbBRANCH23 specific macro expansion into the default
1568              code.  */
1569
1570           bfd_vma address = rel->r_vaddr - input_section->vma;
1571
1572           if (address > input_section->_raw_size)
1573             rstat = bfd_reloc_outofrange;
1574           else
1575             {
1576               bfd_vma         relocation       = val + addend;
1577               int             size             = bfd_get_reloc_size (howto);
1578               boolean         overflow         = false;
1579               bfd_byte *      location         = contents + address;
1580               bfd_vma         x                = bfd_get_32 (input_bfd, location);
1581               bfd_vma         src_mask         = 0x007FFFFE;
1582               bfd_signed_vma  reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1583               bfd_signed_vma  reloc_signed_min = ~reloc_signed_max;
1584               bfd_vma         check;
1585               bfd_signed_vma  signed_check;
1586               bfd_vma         add;
1587               bfd_signed_vma  signed_add;
1588
1589               BFD_ASSERT (size == 4);
1590
1591               /* howto->pc_relative should be TRUE for type 14 BRANCH23 */
1592               relocation -= (input_section->output_section->vma
1593                              + input_section->output_offset);
1594
1595               /* howto->pcrel_offset should be TRUE for type 14 BRANCH23 */
1596               relocation -= address;
1597
1598               /* No need to negate the relocation with BRANCH23.  */
1599               /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23.  */
1600               /* howto->rightshift == 1 */
1601               /* Drop unwanted bits from the value we are relocating to.  */
1602
1603               check = relocation >> howto->rightshift;
1604
1605               /* If this is a signed value, the rightshift just dropped
1606                  leading 1 bits (assuming twos complement).  */
1607               if ((bfd_signed_vma) relocation >= 0)
1608                 signed_check = check;
1609               else
1610                 signed_check = (check
1611                                 | ((bfd_vma) - 1
1612                                    & ~((bfd_vma) - 1 >> howto->rightshift)));
1613
1614               /* Get the value from the object file.  */
1615               if (bfd_big_endian (input_bfd))
1616                 {
1617                   add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1618                 }
1619               else
1620                 {
1621                   add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1622                 }
1623
1624               /* Get the value from the object file with an appropriate sign.
1625                  The expression involving howto->src_mask isolates the upper
1626                  bit of src_mask.  If that bit is set in the value we are
1627                  adding, it is negative, and we subtract out that number times
1628                  two.  If src_mask includes the highest possible bit, then we
1629                  can not get the upper bit, but that does not matter since
1630                  signed_add needs no adjustment to become negative in that
1631                  case.  */
1632
1633               signed_add = add;
1634
1635               if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1636                 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1637
1638               /* Add the value from the object file, shifted so that it is a
1639                  straight number.  */
1640               /* howto->bitpos == 0 */
1641
1642               signed_check += signed_add;
1643               relocation += signed_add;
1644
1645               BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1646
1647               /* Assumes two's complement.  */
1648               if (   signed_check > reloc_signed_max
1649                   || signed_check < reloc_signed_min)
1650                 overflow = true;
1651
1652               /* Put RELOCATION into the correct bits:  */
1653
1654               if (bfd_big_endian (input_bfd))
1655                 {
1656                   relocation = (((relocation & 0xffe) >> 1)  | ((relocation << 4) & 0x07ff0000));
1657                 }
1658               else
1659                 {
1660                   relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1661                 }
1662
1663               /* Add RELOCATION to the correct bits of X:  */
1664               x = ((x & ~howto->dst_mask) | relocation);
1665
1666               /* Put the relocated value back in the object file:  */
1667               bfd_put_32 (input_bfd, x, location);
1668
1669               rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1670             }
1671         }
1672 #endif
1673       else
1674 #endif /* THUMBEXTENSION */
1675         rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1676                                           contents,
1677                                           rel->r_vaddr - input_section->vma,
1678                                           val, addend);
1679 #if 1 /* THUMBEXTENSION */
1680       /* FIXME:
1681          Is this the best way to fix up thumb addresses? krk@cygnus.com
1682          Probably not, but it works, and if it works it don't need fixing!  nickc@cygnus.com */
1683       /* Only perform this fix during the final link, not a relocatable link.  nickc@cygnus.com  */
1684       if (! info->relocateable
1685           && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1686         {
1687           /* Determine if we need to set the bottom bit of a relocated address
1688              because the address is the address of a Thumb code symbol.  */
1689
1690           int patchit = false;
1691
1692           if (h != NULL
1693               && (   h->class == C_THUMBSTATFUNC
1694                   || h->class == C_THUMBEXTFUNC))
1695             {
1696               patchit = true;
1697             }
1698           else if (sym != NULL
1699                    && sym->n_scnum > N_UNDEF)
1700             {
1701               /* No hash entry - use the symbol instead.  */
1702
1703               if (   sym->n_sclass == C_THUMBSTATFUNC
1704                   || sym->n_sclass == C_THUMBEXTFUNC)
1705                 patchit = true;
1706             }
1707
1708           if (patchit)
1709             {
1710               bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1711               bfd_vma    x        = bfd_get_32 (input_bfd, location);
1712
1713               bfd_put_32 (input_bfd, x | 1, location);
1714             }
1715         }
1716 #endif /* THUMBEXTENSION */
1717
1718       switch (rstat)
1719         {
1720         default:
1721           abort ();
1722         case bfd_reloc_ok:
1723           break;
1724         case bfd_reloc_outofrange:
1725           (*_bfd_error_handler)
1726             (_("%s: bad reloc address 0x%lx in section `%s'"),
1727              bfd_get_filename (input_bfd),
1728              (unsigned long) rel->r_vaddr,
1729              bfd_get_section_name (input_bfd, input_section));
1730           return false;
1731         case bfd_reloc_overflow:
1732           {
1733             const char *name;
1734             char buf[SYMNMLEN + 1];
1735
1736             if (symndx == -1)
1737               name = "*ABS*";
1738             else if (h != NULL)
1739               name = h->root.root.string;
1740             else
1741               {
1742                 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1743                 if (name == NULL)
1744                   return false;
1745               }
1746
1747             if (! ((*info->callbacks->reloc_overflow)
1748                    (info, name, howto->name, (bfd_vma) 0, input_bfd,
1749                     input_section, rel->r_vaddr - input_section->vma)))
1750               return false;
1751           }
1752         }
1753     }
1754
1755   return true;
1756 }
1757
1758 #ifndef COFF_IMAGE_WITH_PE
1759
1760 boolean
1761 bfd_arm_allocate_interworking_sections (info)
1762      struct bfd_link_info * info;
1763 {
1764   asection *                        s;
1765   bfd_byte *                        foo;
1766   struct coff_arm_link_hash_table * globals;
1767 #if 0
1768   static char                       test_char = '1';
1769 #endif
1770
1771   globals = coff_arm_hash_table (info);
1772
1773   BFD_ASSERT (globals != NULL);
1774
1775   if (globals->arm_glue_size != 0)
1776     {
1777       BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1778
1779       s = bfd_get_section_by_name
1780         (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1781
1782       BFD_ASSERT (s != NULL);
1783
1784       foo = (bfd_byte *) bfd_alloc
1785         (globals->bfd_of_glue_owner, globals->arm_glue_size);
1786 #if 0
1787       memset (foo, test_char, globals->arm_glue_size);
1788 #endif
1789
1790       s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1791       s->contents = foo;
1792     }
1793
1794   if (globals->thumb_glue_size != 0)
1795     {
1796       BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1797
1798       s = bfd_get_section_by_name
1799         (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1800
1801       BFD_ASSERT (s != NULL);
1802
1803       foo = (bfd_byte *) bfd_alloc
1804         (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1805 #if 0
1806       memset (foo, test_char, globals->thumb_glue_size);
1807 #endif
1808
1809       s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1810       s->contents = foo;
1811     }
1812
1813   return true;
1814 }
1815
1816 static void
1817 record_arm_to_thumb_glue (info, h)
1818      struct bfd_link_info *        info;
1819      struct coff_link_hash_entry * h;
1820 {
1821   const char *                      name = h->root.root.string;
1822   register asection *               s;
1823   char *                            tmp_name;
1824   struct coff_link_hash_entry *     myh;
1825   struct coff_arm_link_hash_table * globals;
1826
1827   globals = coff_arm_hash_table (info);
1828
1829   BFD_ASSERT (globals != NULL);
1830   BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1831
1832   s = bfd_get_section_by_name
1833     (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1834
1835   BFD_ASSERT (s != NULL);
1836
1837   tmp_name = ((char *)
1838               bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1839
1840   BFD_ASSERT (tmp_name);
1841
1842   sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1843
1844   myh = coff_link_hash_lookup
1845     (coff_hash_table (info), tmp_name, false, false, true);
1846
1847   if (myh != NULL)
1848     {
1849       free (tmp_name);
1850       return; /* we've already seen this guy */
1851     }
1852
1853   /* The only trick here is using globals->arm_glue_size as the value. Even
1854      though the section isn't allocated yet, this is where we will be putting
1855      it.  */
1856
1857   bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1858                                 BSF_GLOBAL,
1859                                 s, globals->arm_glue_size + 1,
1860                                 NULL, true, false,
1861                                 (struct bfd_link_hash_entry **) & myh);
1862
1863   free (tmp_name);
1864
1865   globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1866
1867   return;
1868 }
1869
1870 static void
1871 record_thumb_to_arm_glue (info, h)
1872      struct bfd_link_info *        info;
1873      struct coff_link_hash_entry * h;
1874 {
1875   const char *                       name = h->root.root.string;
1876   register asection *                s;
1877   char *                             tmp_name;
1878   struct coff_link_hash_entry *      myh;
1879   struct coff_arm_link_hash_table *  globals;
1880
1881   globals = coff_arm_hash_table (info);
1882
1883   BFD_ASSERT (globals != NULL);
1884   BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1885
1886   s = bfd_get_section_by_name
1887     (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1888
1889   BFD_ASSERT (s != NULL);
1890
1891   tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1892
1893   BFD_ASSERT (tmp_name);
1894
1895   sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1896
1897   myh = coff_link_hash_lookup
1898     (coff_hash_table (info), tmp_name, false, false, true);
1899
1900   if (myh != NULL)
1901     {
1902       free (tmp_name);
1903       return; /* we've already seen this guy */
1904     }
1905
1906   bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1907                                 BSF_GLOBAL, s, globals->thumb_glue_size + 1,
1908                                 NULL, true, false,
1909                                 (struct bfd_link_hash_entry **) & myh);
1910
1911   /* If we mark it 'thumb', the disassembler will do a better job.  */
1912   myh->class = C_THUMBEXTFUNC;
1913
1914   free (tmp_name);
1915
1916   /* Allocate another symbol to mark where we switch to arm mode.  */
1917
1918 #define CHANGE_TO_ARM "__%s_change_to_arm"
1919 #define BACK_FROM_ARM "__%s_back_from_arm"
1920
1921   tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1);
1922
1923   BFD_ASSERT (tmp_name);
1924
1925   sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1926
1927   myh = NULL;
1928
1929   bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1930                                 BSF_LOCAL, s, globals->thumb_glue_size
1931                                 + (globals->support_old_code ? 8 : 4),
1932                                 NULL, true, false,
1933                                 (struct bfd_link_hash_entry **) & myh);
1934
1935   free (tmp_name);
1936
1937   globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1938
1939   return;
1940 }
1941
1942 /* Select a BFD to be used to hold the sections used by the glue code.
1943    This function is called from the linker scripts in ld/emultempl/
1944    {armcoff/pe}.em  */
1945
1946 boolean
1947 bfd_arm_get_bfd_for_interworking (abfd, info)
1948      bfd *                  abfd;
1949      struct bfd_link_info * info;
1950 {
1951   struct coff_arm_link_hash_table * globals;
1952   flagword                          flags;
1953   asection *                        sec;
1954
1955   /* If we are only performing a partial link do not bother
1956      getting a bfd to hold the glue.  */
1957   if (info->relocateable)
1958     return true;
1959
1960   globals = coff_arm_hash_table (info);
1961
1962   BFD_ASSERT (globals != NULL);
1963
1964   if (globals->bfd_of_glue_owner != NULL)
1965     return true;
1966
1967   sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1968
1969   if (sec == NULL)
1970     {
1971       flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1972
1973       sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1974
1975       if (sec == NULL
1976           || ! bfd_set_section_flags (abfd, sec, flags)
1977           || ! bfd_set_section_alignment (abfd, sec, 2))
1978         return false;
1979     }
1980
1981   sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1982
1983   if (sec == NULL)
1984     {
1985       flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1986
1987       sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1988
1989       if (sec == NULL
1990           || ! bfd_set_section_flags (abfd, sec, flags)
1991           || ! bfd_set_section_alignment (abfd, sec, 2))
1992         return false;
1993     }
1994
1995   /* Save the bfd for later use.  */
1996   globals->bfd_of_glue_owner = abfd;
1997
1998   return true;
1999 }
2000
2001 boolean
2002 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2003      bfd *                   abfd;
2004      struct bfd_link_info *  info;
2005      int                     support_old_code;
2006 {
2007   asection * sec;
2008   struct coff_arm_link_hash_table * globals;
2009
2010   /* If we are only performing a partial link do not bother
2011      to construct any glue.  */
2012   if (info->relocateable)
2013     return true;
2014
2015   /* Here we have a bfd that is to be included on the link.  We have a hook
2016      to do reloc rummaging, before section sizes are nailed down.  */
2017
2018   _bfd_coff_get_external_symbols (abfd);
2019
2020   globals = coff_arm_hash_table (info);
2021
2022   BFD_ASSERT (globals != NULL);
2023   BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2024
2025   globals->support_old_code = support_old_code;
2026
2027   /* Rummage around all the relocs and map the glue vectors.  */
2028   sec = abfd->sections;
2029
2030   if (sec == NULL)
2031     return true;
2032
2033   for (; sec != NULL; sec = sec->next)
2034     {
2035       struct internal_reloc * i;
2036       struct internal_reloc * rel;
2037
2038       if (sec->reloc_count == 0)
2039         continue;
2040
2041       /* Load the relocs.  */
2042       /* FIXME: there may be a storage leak here.  */
2043
2044       i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2045
2046       BFD_ASSERT (i != 0);
2047
2048       for (rel = i; rel < i + sec->reloc_count; ++rel)
2049         {
2050           unsigned short                 r_type  = rel->r_type;
2051           long                           symndx;
2052           struct coff_link_hash_entry *  h;
2053
2054           symndx = rel->r_symndx;
2055
2056           /* If the relocation is not against a symbol it cannot concern us.  */
2057           if (symndx == -1)
2058             continue;
2059
2060           /* If the index is outside of the range of our table, something has gone wrong.  */
2061           if (symndx >= obj_conv_table_size (abfd))
2062             {
2063               _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2064                                   bfd_get_filename (abfd), symndx);
2065               continue;
2066             }
2067
2068           h = obj_coff_sym_hashes (abfd)[symndx];
2069
2070           /* If the relocation is against a static symbol it must be within
2071              the current section and so cannot be a cross ARM/Thumb relocation.  */
2072           if (h == NULL)
2073             continue;
2074
2075           switch (r_type)
2076             {
2077             case ARM_26:
2078               /* This one is a call from arm code.  We need to look up
2079                  the target of the call. If it is a thumb target, we
2080                  insert glue.  */
2081
2082               if (h->class == C_THUMBEXTFUNC)
2083                 record_arm_to_thumb_glue (info, h);
2084               break;
2085
2086 #ifndef ARM_WINCE
2087             case ARM_THUMB23:
2088               /* This one is a call from thumb code.  We used to look
2089                  for ARM_THUMB9 and ARM_THUMB12 as well.  We need to look
2090                  up the target of the call. If it is an arm target, we
2091                  insert glue.  If the symbol does not exist it will be
2092                  given a class of C_EXT and so we will generate a stub
2093                  for it.  This is not really a problem, since the link
2094                  is doomed anyway.  */
2095
2096               switch (h->class)
2097                 {
2098                 case C_EXT:
2099                 case C_STAT:
2100                 case C_LABEL:
2101                   record_thumb_to_arm_glue (info, h);
2102                   break;
2103                 default:
2104                   ;
2105                 }
2106               break;
2107 #endif
2108
2109             default:
2110               break;
2111             }
2112         }
2113     }
2114
2115   return true;
2116 }
2117
2118 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2119
2120 #define coff_bfd_reloc_type_lookup              coff_arm_reloc_type_lookup
2121 #define coff_relocate_section                   coff_arm_relocate_section
2122 #define coff_bfd_is_local_label_name            coff_arm_is_local_label_name
2123 #define coff_adjust_symndx                      coff_arm_adjust_symndx
2124 #define coff_link_output_has_begun              coff_arm_link_output_has_begun
2125 #define coff_final_link_postscript              coff_arm_final_link_postscript
2126 #define coff_bfd_merge_private_bfd_data         coff_arm_merge_private_bfd_data
2127 #define coff_bfd_print_private_bfd_data         coff_arm_print_private_bfd_data
2128 #define coff_bfd_set_private_flags              _bfd_coff_arm_set_private_flags
2129 #define coff_bfd_copy_private_bfd_data          coff_arm_copy_private_bfd_data
2130 #define coff_bfd_link_hash_table_create         coff_arm_link_hash_table_create
2131
2132 /* When doing a relocateable link, we want to convert ARM26 relocs
2133    into ARM26D relocs.  */
2134
2135 static boolean
2136 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2137      bfd *obfd ATTRIBUTE_UNUSED;
2138      struct bfd_link_info *info ATTRIBUTE_UNUSED;
2139      bfd *ibfd;
2140      asection *sec;
2141      struct internal_reloc *irel;
2142      boolean *adjustedp;
2143 {
2144   if (irel->r_type == 3)
2145     {
2146       struct coff_link_hash_entry *h;
2147
2148       h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2149       if (h != NULL
2150           && (h->root.type == bfd_link_hash_defined
2151               || h->root.type == bfd_link_hash_defweak)
2152           && h->root.u.def.section->output_section == sec->output_section)
2153         irel->r_type = 7;
2154     }
2155   *adjustedp = false;
2156   return true;
2157 }
2158
2159 /* Called when merging the private data areas of two BFDs.
2160    This is important as it allows us to detect if we are
2161    attempting to merge binaries compiled for different ARM
2162    targets, eg different CPUs or differents APCS's.     */
2163
2164 static boolean
2165 coff_arm_merge_private_bfd_data (ibfd, obfd)
2166      bfd *   ibfd;
2167      bfd *   obfd;
2168 {
2169   BFD_ASSERT (ibfd != NULL && obfd != NULL);
2170
2171   if (ibfd == obfd)
2172     return true;
2173
2174   /* If the two formats are different we cannot merge anything.
2175      This is not an error, since it is permissable to change the
2176      input and output formats.  */
2177   if (   ibfd->xvec->flavour != bfd_target_coff_flavour
2178       || obfd->xvec->flavour != bfd_target_coff_flavour)
2179     return true;
2180
2181   /* Verify that the APCS is the same for the two BFDs */
2182   if (APCS_SET (ibfd))
2183     {
2184       if (APCS_SET (obfd))
2185         {
2186           /* If the src and dest have different APCS flag bits set, fail.  */
2187           if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2188             {
2189               _bfd_error_handler
2190                 /* xgettext: c-format */
2191                 (_("%s: ERROR: compiled for APCS-%d whereas target %s uses APCS-%d"),
2192                  bfd_get_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2193                  bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2194                  );
2195
2196               bfd_set_error (bfd_error_wrong_format);
2197               return false;
2198             }
2199
2200           if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2201             {
2202               const char *msg;
2203
2204               if (APCS_FLOAT_FLAG (ibfd))
2205                 /* xgettext: c-format */
2206                 msg = _("%s: ERROR: passes floats in float registers whereas target %s uses integer registers");
2207               else
2208                 /* xgettext: c-format */
2209                 msg = _("%s: ERROR: passes floats in integer registers whereas target %s uses float registers");
2210
2211               _bfd_error_handler (msg, bfd_get_filename (ibfd),
2212                                   bfd_get_filename (obfd));
2213
2214               bfd_set_error (bfd_error_wrong_format);
2215               return false;
2216             }
2217
2218           if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2219             {
2220               const char * msg;
2221
2222               if (PIC_FLAG (ibfd))
2223                 /* xgettext: c-format */
2224                 msg = _("%s: ERROR: compiled as position independent code, whereas target %s is absolute position");
2225               else
2226                 /* xgettext: c-format */
2227                 msg = _("%s: ERROR: compiled as absolute position code, whereas target %s is position independent");
2228               _bfd_error_handler (msg, bfd_get_filename (ibfd),
2229                                   bfd_get_filename (obfd));
2230
2231               bfd_set_error (bfd_error_wrong_format);
2232               return false;
2233             }
2234         }
2235       else
2236         {
2237           SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2238
2239           /* Set up the arch and fields as well as these are probably wrong.  */
2240           bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2241         }
2242     }
2243
2244   /* Check the interworking support.  */
2245   if (INTERWORK_SET (ibfd))
2246     {
2247       if (INTERWORK_SET (obfd))
2248         {
2249           /* If the src and dest differ in their interworking issue a warning.  */
2250           if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2251             {
2252               const char * msg;
2253
2254               if (INTERWORK_FLAG (ibfd))
2255                 /* xgettext: c-format */
2256                 msg = _("Warning: input file %s supports interworking, whereas %s does not.");
2257               else
2258                 /* xgettext: c-format */
2259                 msg = _("Warning: input file %s does not support interworking, whereas %s does.");
2260
2261               _bfd_error_handler (msg, bfd_get_filename (ibfd),
2262                                   bfd_get_filename (obfd));
2263             }
2264         }
2265       else
2266         {
2267           SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2268         }
2269     }
2270
2271   return true;
2272 }
2273
2274 /* Display the flags field.  */
2275
2276 static boolean
2277 coff_arm_print_private_bfd_data (abfd, ptr)
2278      bfd *   abfd;
2279      PTR     ptr;
2280 {
2281   FILE * file = (FILE *) ptr;
2282
2283   BFD_ASSERT (abfd != NULL && ptr != NULL);
2284
2285   /* xgettext:c-format */
2286   fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2287
2288   if (APCS_SET (abfd))
2289     {
2290       /* xgettext: APCS is ARM Prodecure Call Standard, it should not be translated.  */
2291       fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2292
2293       if (APCS_FLOAT_FLAG (abfd))
2294         fprintf (file, _(" [floats passed in float registers]"));
2295       else
2296         fprintf (file, _(" [floats passed in integer registers]"));
2297
2298       if (PIC_FLAG (abfd))
2299         fprintf (file, _(" [position independent]"));
2300       else
2301         fprintf (file, _(" [absolute position]"));
2302     }
2303
2304   if (! INTERWORK_SET (abfd))
2305     fprintf (file, _(" [interworking flag not initialised]"));
2306   else if (INTERWORK_FLAG (abfd))
2307     fprintf (file, _(" [interworking supported]"));
2308   else
2309     fprintf (file, _(" [interworking not supported]"));
2310
2311   fputc ('\n', file);
2312
2313   return true;
2314 }
2315
2316 /* Copies the given flags into the coff_tdata.flags field.
2317    Typically these flags come from the f_flags[] field of
2318    the COFF filehdr structure, which contains important,
2319    target specific information.
2320    Note: Although this function is static, it is explicitly
2321    called from both coffcode.h and peicode.h.  */
2322
2323 static boolean
2324 _bfd_coff_arm_set_private_flags (abfd, flags)
2325         bfd *      abfd;
2326         flagword   flags;
2327 {
2328   flagword flag;
2329
2330   BFD_ASSERT (abfd != NULL);
2331
2332   flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2333
2334   /* Make sure that the APCS field has not been initialised to the opposite
2335      value.  */
2336   if (APCS_SET (abfd)
2337       && (   (APCS_26_FLAG    (abfd) != flag)
2338           || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2339           || (PIC_FLAG        (abfd) != (flags & F_PIC))
2340           ))
2341     return false;
2342
2343   flag |= (flags & (F_APCS_FLOAT | F_PIC));
2344
2345   SET_APCS_FLAGS (abfd, flag);
2346
2347   flag = (flags & F_INTERWORK);
2348
2349   /* If the BFD has already had its interworking flag set, but it
2350      is different from the value that we have been asked to set,
2351      then assume that that merged code will not support interworking
2352      and set the flag accordingly.  */
2353   if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2354     {
2355       if (flag)
2356         /* xgettext: c-format */
2357         _bfd_error_handler (_("Warning: Not setting interworking flag of %s, since it has already been specified as non-interworking"),
2358                             bfd_get_filename (abfd));
2359       else
2360         /* xgettext: c-format */
2361         _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2362                             bfd_get_filename (abfd));
2363       flag = 0;
2364     }
2365
2366   SET_INTERWORK_FLAG (abfd, flag);
2367
2368   return true;
2369 }
2370
2371 /* Copy the important parts of the target specific data
2372    from one instance of a BFD to another.  */
2373
2374 static boolean
2375 coff_arm_copy_private_bfd_data (src, dest)
2376      bfd *  src;
2377      bfd *  dest;
2378 {
2379   BFD_ASSERT (src != NULL && dest != NULL);
2380
2381   if (src == dest)
2382     return true;
2383
2384   /* If the destination is not in the same format as the source, do not do
2385      the copy.  */
2386   if (src->xvec != dest->xvec)
2387     return true;
2388
2389   /* copy the flags field */
2390   if (APCS_SET (src))
2391     {
2392       if (APCS_SET (dest))
2393         {
2394           /* If the src and dest have different APCS flag bits set, fail.  */
2395           if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2396             return false;
2397
2398           if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2399             return false;
2400
2401           if (PIC_FLAG (dest) != PIC_FLAG (src))
2402             return false;
2403         }
2404       else
2405         SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2406                         | PIC_FLAG (src));
2407     }
2408
2409   if (INTERWORK_SET (src))
2410     {
2411       if (INTERWORK_SET (dest))
2412         {
2413           /* If the src and dest have different interworking flags then turn
2414              off the interworking bit.  */
2415           if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2416             {
2417               if (INTERWORK_FLAG (dest))
2418                 {
2419                   /* xgettext:c-format */
2420                   _bfd_error_handler (("Warning: Clearing the interworking bit of %s, because the non-interworking code in %s has been copied into it"),
2421                                       bfd_get_filename (dest),
2422                                       bfd_get_filename (src));
2423                 }
2424
2425               SET_INTERWORK_FLAG (dest, 0);
2426             }
2427         }
2428       else
2429         {
2430           SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2431         }
2432     }
2433
2434   return true;
2435 }
2436
2437 /* Note:  the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2438  *must* match the definitions in gcc/config/arm/coff.h and semi.h */
2439 #define LOCAL_LABEL_PREFIX "."
2440 #ifndef USER_LABEL_PREFIX
2441 #define USER_LABEL_PREFIX "_"
2442 #endif
2443
2444 /* Like _bfd_coff_is_local_label_name, but
2445    a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2446       non-local.
2447    b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2448       labels of the form Lxxx to be stripped.  */
2449 static boolean
2450 coff_arm_is_local_label_name (abfd, name)
2451      bfd *        abfd ATTRIBUTE_UNUSED;
2452      const char * name;
2453 {
2454 #ifdef USER_LABEL_PREFIX
2455   if (USER_LABEL_PREFIX[0] != 0)
2456     {
2457       if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2458         return false;
2459     }
2460 #endif
2461
2462 #ifdef LOCAL_LABEL_PREFIX
2463   /* If there is a prefix for local labels then look for this.
2464      If the prefix exists, but it is empty, then ignore the test.  */
2465
2466   if (LOCAL_LABEL_PREFIX[0] != 0)
2467     {
2468       int len = strlen (LOCAL_LABEL_PREFIX);
2469
2470       if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2471         return false;
2472
2473       /* Perform the checks below for the rest of the name.  */
2474       name += len;
2475     }
2476 #endif
2477
2478   return name[0] == 'L';
2479 }
2480
2481 /* This piece of machinery exists only to guarantee that the bfd that holds
2482    the glue section is written last.
2483
2484    This does depend on bfd_make_section attaching a new section to the
2485    end of the section list for the bfd.
2486
2487    krk@cygnus.com  */
2488
2489 static boolean
2490 coff_arm_link_output_has_begun (sub, info)
2491      bfd * sub;
2492      struct coff_final_link_info * info;
2493 {
2494   return (sub->output_has_begun
2495           || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2496 }
2497
2498 static boolean
2499 coff_arm_final_link_postscript (abfd, pfinfo)
2500      bfd * abfd ATTRIBUTE_UNUSED;
2501      struct coff_final_link_info * pfinfo;
2502 {
2503   struct coff_arm_link_hash_table * globals;
2504
2505   globals = coff_arm_hash_table (pfinfo->info);
2506
2507   BFD_ASSERT (globals != NULL);
2508
2509   if (globals->bfd_of_glue_owner != NULL)
2510     {
2511       if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2512         return false;
2513
2514       globals->bfd_of_glue_owner->output_has_begun = true;
2515     }
2516
2517   return true;
2518 }
2519
2520 #include "coffcode.h"
2521
2522 #ifndef TARGET_LITTLE_SYM
2523 #define TARGET_LITTLE_SYM armcoff_little_vec
2524 #endif
2525 #ifndef TARGET_LITTLE_NAME
2526 #define TARGET_LITTLE_NAME "coff-arm-little"
2527 #endif
2528 #ifndef TARGET_BIG_SYM
2529 #define TARGET_BIG_SYM armcoff_big_vec
2530 #endif
2531 #ifndef TARGET_BIG_NAME
2532 #define TARGET_BIG_NAME "coff-arm-big"
2533 #endif
2534
2535 #ifndef TARGET_UNDERSCORE
2536 #define TARGET_UNDERSCORE 0
2537 #endif
2538
2539 #ifndef EXTRA_S_FLAGS
2540 #ifdef COFF_WITH_PE
2541 #define EXTRA_S_FLAGS (SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2542 #else
2543 #define EXTRA_S_FLAGS 0
2544 #endif
2545 #endif
2546
2547 /* Forward declaration for use initialising alternative_target field.  */
2548 extern const bfd_target TARGET_BIG_SYM ;
2549
2550 /* Target vectors.  */
2551 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM)
2552 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM)
2553