bfd/elfarm-oabi.c

   1 /* 32-bit ELF support for ARM old abi option.
   2    Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #define OLD_ARM_ABI
  21
  22 #include "elf/arm.h"
  23 #include "bfd.h"
  24 #include "sysdep.h"
  25 #include "libbfd.h"
  26 #include "elf-bfd.h"
  27
  28 #ifndef NUM_ELEM
  29 #define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0])
  30 #endif
  31
  32 #define USE_RELA
  33
  34 #define TARGET_LITTLE_SYM               bfd_elf32_littlearm_oabi_vec
  35 #define TARGET_LITTLE_NAME              "elf32-littlearm-oabi"
  36 #define TARGET_BIG_SYM                  bfd_elf32_bigarm_oabi_vec
  37 #define TARGET_BIG_NAME                 "elf32-bigarm-oabi"
  38
  39 #define elf_info_to_howto               elf32_arm_info_to_howto
  40 #define elf_info_to_howto_rel           0
  41
  42 #define ARM_ELF_ABI_VERSION             0
  43 #define ARM_ELF_OS_ABI_VERSION          0
  44
  45 static reloc_howto_type * find_howto                  PARAMS ((unsigned int));
  46 static void               elf32_arm_info_to_howto     PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
  47 static reloc_howto_type * elf32_arm_reloc_type_lookup PARAMS ((bfd *, bfd_reloc_code_real_type));
  48
  49 static reloc_howto_type elf32_arm_howto_table[] =
  50   {
  51     /* No relocation.  */
  52     HOWTO (R_ARM_NONE,          /* type */
  53            0,                   /* rightshift */
  54            0,                   /* size (0 = byte, 1 = short, 2 = long) */
  55            0,                   /* bitsize */
  56            false,               /* pc_relative */
  57            0,                   /* bitpos */
  58            complain_overflow_dont,      /* complain_on_overflow */
  59            bfd_elf_generic_reloc,       /* special_function */
  60            "R_ARM_NONE",        /* name */
  61            false,               /* partial_inplace */
  62            0,                   /* src_mask */
  63            0,                   /* dst_mask */
  64            false),              /* pcrel_offset */
  65
  66     HOWTO (R_ARM_PC24,          /* type */
  67            2,                   /* rightshift */
  68            2,                   /* size (0 = byte, 1 = short, 2 = long) */
  69            24,                  /* bitsize */
  70            true,                /* pc_relative */
  71            0,                   /* bitpos */
  72            complain_overflow_signed,    /* complain_on_overflow */
  73            bfd_elf_generic_reloc,       /* special_function */
  74            "R_ARM_PC24",        /* name */
  75            false,               /* partial_inplace */
  76            0x00ffffff,          /* src_mask */
  77            0x00ffffff,          /* dst_mask */
  78            true),                       /* pcrel_offset */
  79
  80     /* 32 bit absolute.  */
  81     HOWTO (R_ARM_ABS32,         /* type */
  82            0,                   /* rightshift */
  83            2,                   /* size (0 = byte, 1 = short, 2 = long) */
  84            32,                  /* bitsize */
  85            false,               /* pc_relative */
  86            0,                   /* bitpos */
  87            complain_overflow_bitfield,  /* complain_on_overflow */
  88            bfd_elf_generic_reloc,       /* special_function */
  89            "R_ARM_ABS32",       /* name */
  90            false,               /* partial_inplace */
  91            0xffffffff,          /* src_mask */
  92            0xffffffff,          /* dst_mask */
  93            false),              /* pcrel_offset */
  94
  95     /* Standard 32bit pc-relative reloc.  */
  96     HOWTO (R_ARM_REL32,         /* type */
  97            0,                   /* rightshift */
  98            2,                   /* size (0 = byte, 1 = short, 2 = long) */
  99            32,                  /* bitsize */
 100            true,                /* pc_relative */
 101            0,                   /* bitpos */
 102            complain_overflow_bitfield,  /* complain_on_overflow */
 103            bfd_elf_generic_reloc,       /* special_function */
 104            "R_ARM_REL32",       /* name */
 105            false,               /* partial_inplace */
 106            0xffffffff,          /* src_mask */
 107            0xffffffff,          /* dst_mask */
 108            true),               /* pcrel_offset */
 109
 110     /* 8 bit absolute.  */
 111     HOWTO (R_ARM_ABS8,          /* type */
 112            0,                   /* rightshift */
 113            0,                   /* size (0 = byte, 1 = short, 2 = long) */
 114            8,                   /* bitsize */
 115            false,               /* pc_relative */
 116            0,                   /* bitpos */
 117            complain_overflow_bitfield,  /* complain_on_overflow */
 118            bfd_elf_generic_reloc,       /* special_function */
 119            "R_ARM_ABS8",        /* name */
 120            false,               /* partial_inplace */
 121            0x000000ff,          /* src_mask */
 122            0x000000ff,          /* dst_mask */
 123            false),              /* pcrel_offset */
 124
 125     /* 16 bit absolute.  */
 126     HOWTO (R_ARM_ABS16,         /* type */
 127            0,                   /* rightshift */
 128            1,                   /* size (0 = byte, 1 = short, 2 = long) */
 129            16,                  /* bitsize */
 130            false,               /* pc_relative */
 131            0,                   /* bitpos */
 132            complain_overflow_bitfield,  /* complain_on_overflow */
 133            bfd_elf_generic_reloc,       /* special_function */
 134            "R_ARM_ABS16",       /* name */
 135            false,               /* partial_inplace */
 136            0,                   /* src_mask */
 137            0,                   /* dst_mask */
 138            false),              /* pcrel_offset */
 139
 140     /* 12 bit absolute.  */
 141     HOWTO (R_ARM_ABS12,         /* type */
 142            0,                   /* rightshift */
 143            2,                   /* size (0 = byte, 1 = short, 2 = long) */
 144            12,                  /* bitsize */
 145            false,               /* pc_relative */
 146            0,                   /* bitpos */
 147            complain_overflow_bitfield,  /* complain_on_overflow */
 148            bfd_elf_generic_reloc,       /* special_function */
 149            "R_ARM_ABS12",       /* name */
 150            false,               /* partial_inplace */
 151            0x000008ff,          /* src_mask */
 152            0x000008ff,          /* dst_mask */
 153            false),              /* pcrel_offset */
 154
 155     HOWTO (R_ARM_THM_ABS5,      /* type */
 156            6,                   /* rightshift */
 157            1,                   /* size (0 = byte, 1 = short, 2 = long) */
 158            5,                   /* bitsize */
 159            false,               /* pc_relative */
 160            0,                   /* bitpos */
 161            complain_overflow_bitfield,  /* complain_on_overflow */
 162            bfd_elf_generic_reloc,       /* special_function */
 163            "R_ARM_THM_ABS5",    /* name */
 164            false,               /* partial_inplace */
 165            0x000007e0,          /* src_mask */
 166            0x000007e0,          /* dst_mask */
 167            false),              /* pcrel_offset */
 168
 169     HOWTO (R_ARM_THM_PC22,      /* type */
 170            1,                   /* rightshift */
 171            2,                   /* size (0 = byte, 1 = short, 2 = long) */
 172            23,                  /* bitsize */
 173            true,                /* pc_relative */
 174            0,                   /* bitpos */
 175            complain_overflow_signed,    /* complain_on_overflow */
 176            bfd_elf_generic_reloc,       /* special_function */
 177            "R_ARM_THM_PC22",    /* name */
 178            false,               /* partial_inplace */
 179            0x07ff07ff,          /* src_mask */
 180            0x07ff07ff,          /* dst_mask */
 181            true),                       /* pcrel_offset */
 182
 183     HOWTO (R_ARM_SBREL32,               /* type */
 184            0,                   /* rightshift */
 185            0,                   /* size (0 = byte, 1 = short, 2 = long) */
 186            0,                   /* bitsize */
 187            false,               /* pc_relative */
 188            0,                   /* bitpos */
 189            complain_overflow_dont,/* complain_on_overflow */
 190            bfd_elf_generic_reloc,       /* special_function */
 191            "R_ARM_SBREL32",     /* name */
 192            false,               /* partial_inplace */
 193            0,                   /* src_mask */
 194            0,                   /* dst_mask */
 195            false),              /* pcrel_offset */
 196
 197     HOWTO (R_ARM_AMP_VCALL9,    /* type */
 198            1,                   /* rightshift */
 199            1,                   /* size (0 = byte, 1 = short, 2 = long) */
 200            8,                   /* bitsize */
 201            true,                /* pc_relative */
 202            0,                   /* bitpos */
 203            complain_overflow_signed,    /* complain_on_overflow */
 204            bfd_elf_generic_reloc,       /* special_function */
 205            "R_ARM_AMP_VCALL9",  /* name */
 206            false,               /* partial_inplace */
 207            0x000000ff,          /* src_mask */
 208            0x000000ff,          /* dst_mask */
 209            true),               /* pcrel_offset */
 210
 211     /* 12 bit pc relative.  */
 212     HOWTO (R_ARM_THM_PC11,      /* type */
 213            1,                   /* rightshift */
 214            1,                   /* size (0 = byte, 1 = short, 2 = long) */
 215            11,                  /* bitsize */
 216            true,                /* pc_relative */
 217            0,                   /* bitpos */
 218            complain_overflow_signed,    /* complain_on_overflow */
 219            bfd_elf_generic_reloc,       /* special_function */
 220            "R_ARM_THM_PC11",    /* name */
 221            false,               /* partial_inplace */
 222            0x000007ff,          /* src_mask */
 223            0x000007ff,          /* dst_mask */
 224            true),               /* pcrel_offset */
 225
 226     /* 12 bit pc relative.  */
 227     HOWTO (R_ARM_THM_PC9,       /* type */
 228            1,                   /* rightshift */
 229            1,                   /* size (0 = byte, 1 = short, 2 = long) */
 230            8,                   /* bitsize */
 231            true,                /* pc_relative */
 232            0,                   /* bitpos */
 233            complain_overflow_signed,    /* complain_on_overflow */
 234            bfd_elf_generic_reloc,       /* special_function */
 235            "R_ARM_THM_PC9",     /* name */
 236            false,               /* partial_inplace */
 237            0x000000ff,          /* src_mask */
 238            0x000000ff,          /* dst_mask */
 239            true),               /* pcrel_offset */
 240
 241     /* GNU extension to record C++ vtable hierarchy.  */
 242     HOWTO (R_ARM_GNU_VTINHERIT, /* type */
 243            0,                     /* rightshift */
 244            2,                     /* size (0 = byte, 1 = short, 2 = long) */
 245            0,                     /* bitsize */
 246            false,                 /* pc_relative */
 247            0,                     /* bitpos */
 248            complain_overflow_dont, /* complain_on_overflow */
 249            NULL,                  /* special_function */
 250            "R_ARM_GNU_VTINHERIT", /* name */
 251            false,                 /* partial_inplace */
 252            0,                     /* src_mask */
 253            0,                     /* dst_mask */
 254            false),                /* pcrel_offset */
 255
 256     /* GNU extension to record C++ vtable member usage.  */
 257     HOWTO (R_ARM_GNU_VTENTRY,     /* type */
 258            0,                     /* rightshift */
 259            2,                     /* size (0 = byte, 1 = short, 2 = long) */
 260            0,                     /* bitsize */
 261            false,                 /* pc_relative */
 262            0,                     /* bitpos */
 263            complain_overflow_dont, /* complain_on_overflow */
 264            _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
 265            "R_ARM_GNU_VTENTRY",   /* name */
 266            false,                 /* partial_inplace */
 267            0,                     /* src_mask */
 268            0,                     /* dst_mask */
 269            false),                /* pcrel_offset */
 270
 271     /* XXX - gap in index numbering here.  */
 272
 273     HOWTO (R_ARM_PLT32,         /* type */
 274            2,                   /* rightshift */
 275            2,                   /* size (0 = byte, 1 = short, 2 = long) */
 276            26,                  /* bitsize */
 277            true,                /* pc_relative */
 278            0,                   /* bitpos */
 279            complain_overflow_bitfield,/* complain_on_overflow */
 280            bfd_elf_generic_reloc, /* special_function */
 281            "R_ARM_PLT32",       /* name */
 282            true,                /* partial_inplace */
 283            0x00ffffff,          /* src_mask */
 284            0x00ffffff,          /* dst_mask */
 285            true),                       /* pcrel_offset */
 286
 287     /* XXX - gap in index numbering here.  */
 288
 289     HOWTO (R_ARM_RREL32,        /* type */
 290            0,                   /* rightshift */
 291            0,                   /* size (0 = byte, 1 = short, 2 = long) */
 292            0,                   /* bitsize */
 293            false,               /* pc_relative */
 294            0,                   /* bitpos */
 295            complain_overflow_dont,      /* complain_on_overflow */
 296            bfd_elf_generic_reloc,       /* special_function */
 297            "R_ARM_RREL32",      /* name */
 298            false,               /* partial_inplace */
 299            0,                   /* src_mask */
 300            0,                   /* dst_mask */
 301            false),              /* pcrel_offset */
 302
 303     HOWTO (R_ARM_RABS32,        /* type */
 304            0,                   /* rightshift */
 305            0,                   /* size (0 = byte, 1 = short, 2 = long) */
 306            0,                   /* bitsize */
 307            false,               /* pc_relative */
 308            0,                   /* bitpos */
 309            complain_overflow_dont,      /* complain_on_overflow */
 310            bfd_elf_generic_reloc,       /* special_function */
 311            "R_ARM_RABS32",      /* name */
 312            false,               /* partial_inplace */
 313            0,                   /* src_mask */
 314            0,                   /* dst_mask */
 315            false),              /* pcrel_offset */
 316
 317     HOWTO (R_ARM_RPC24,         /* type */
 318            0,                   /* rightshift */
 319            0,                   /* size (0 = byte, 1 = short, 2 = long) */
 320            0,                   /* bitsize */
 321            false,               /* pc_relative */
 322            0,                   /* bitpos */
 323            complain_overflow_dont,      /* complain_on_overflow */
 324            bfd_elf_generic_reloc,       /* special_function */
 325            "R_ARM_RPC24",       /* name */
 326            false,               /* partial_inplace */
 327            0,                   /* src_mask */
 328            0,                   /* dst_mask */
 329            false),              /* pcrel_offset */
 330
 331     HOWTO (R_ARM_RBASE,         /* type */
 332            0,                   /* rightshift */
 333            0,                   /* size (0 = byte, 1 = short, 2 = long) */
 334            0,                   /* bitsize */
 335            false,               /* pc_relative */
 336            0,                   /* bitpos */
 337            complain_overflow_dont,      /* complain_on_overflow */
 338            bfd_elf_generic_reloc,       /* special_function */
 339            "R_ARM_RBASE",       /* name */
 340            false,               /* partial_inplace */
 341            0,                   /* src_mask */
 342            0,                   /* dst_mask */
 343            false)               /* pcrel_offset */
 344   };
 345
 346 /* Locate a reloc in the howto table.  This function must be used
 347    when the entry number is is > R_ARM_GNU_VTINHERIT.  */
 348
 349 static reloc_howto_type *
 350 find_howto (r_type)
 351      unsigned int r_type;
 352 {
 353   int i;
 354
 355   for (i = NUM_ELEM (elf32_arm_howto_table); i--;)
 356     if (elf32_arm_howto_table [i].type == r_type)
 357       return elf32_arm_howto_table + i;
 358
 359   return NULL;
 360 }
 361
 362 static void
 363 elf32_arm_info_to_howto (abfd, bfd_reloc, elf_reloc)
 364      bfd *abfd ATTRIBUTE_UNUSED;
 365      arelent *bfd_reloc;
 366      Elf32_Internal_Rela *elf_reloc;
 367 {
 368   unsigned int r_type;
 369
 370   r_type = ELF32_R_TYPE (elf_reloc->r_info);
 371
 372   if (r_type <= R_ARM_GNU_VTINHERIT)
 373     bfd_reloc->howto = & elf32_arm_howto_table[r_type];
 374   else
 375     bfd_reloc->howto = find_howto (r_type);
 376 }
 377
 378 struct elf32_arm_reloc_map
 379   {
 380     bfd_reloc_code_real_type bfd_reloc_val;
 381     unsigned char elf_reloc_val;
 382   };
 383
 384 static const struct elf32_arm_reloc_map elf32_arm_reloc_map[] =
 385   {
 386     {BFD_RELOC_NONE,                 R_ARM_NONE },
 387     {BFD_RELOC_ARM_PCREL_BRANCH,     R_ARM_PC24 },
 388     {BFD_RELOC_32,                   R_ARM_ABS32 },
 389     {BFD_RELOC_32_PCREL,             R_ARM_REL32 },
 390     {BFD_RELOC_8,                    R_ARM_ABS8 },
 391     {BFD_RELOC_16,                   R_ARM_ABS16 },
 392     {BFD_RELOC_ARM_OFFSET_IMM,       R_ARM_ABS12 },
 393     {BFD_RELOC_ARM_THUMB_OFFSET,     R_ARM_THM_ABS5 },
 394     {BFD_RELOC_THUMB_PCREL_BRANCH23, R_ARM_THM_PC22 },
 395     {BFD_RELOC_NONE,                 R_ARM_SBREL32 },
 396     {BFD_RELOC_NONE,                 R_ARM_AMP_VCALL9 },
 397     {BFD_RELOC_THUMB_PCREL_BRANCH12, R_ARM_THM_PC11 },
 398     {BFD_RELOC_THUMB_PCREL_BRANCH9,  R_ARM_THM_PC9 },
 399     {BFD_RELOC_VTABLE_INHERIT,       R_ARM_GNU_VTINHERIT },
 400     {BFD_RELOC_VTABLE_ENTRY,         R_ARM_GNU_VTENTRY }
 401   };
 402
 403 static reloc_howto_type *
 404 elf32_arm_reloc_type_lookup (abfd, code)
 405      bfd * abfd ATTRIBUTE_UNUSED;
 406      bfd_reloc_code_real_type code;
 407 {
 408   unsigned int i;
 409
 410   for (i = NUM_ELEM (elf32_arm_reloc_map); i--;)
 411     if (elf32_arm_reloc_map[i].bfd_reloc_val == code)
 412       return & elf32_arm_howto_table [elf32_arm_reloc_map[i].elf_reloc_val];
 413
 414   if (code == BFD_RELOC_ARM_PLT32)
 415     return find_howto (R_ARM_PLT32);
 416
 417   return NULL;
 418 }
 419
 420 #define bfd_elf32_arm_allocate_interworking_sections \
 421         bfd_elf32_arm_oabi_allocate_interworking_sections
 422 #define bfd_elf32_arm_get_bfd_for_interworking \
 423         bfd_elf32_arm_oabi_get_bfd_for_interworking
 424 #define bfd_elf32_arm_process_before_allocation \
 425         bfd_elf32_arm_oabi_process_before_allocation
 426
 427 #include "elf32-arm.h"