bfd/elfarm-oabi.c

   1 /* 32-bit ELF support for ARM old abi option.
   2    Copyright 1999, 2000, 2001, 2002 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 #define bfd_elf32_arm_allocate_interworking_sections \
  22         bfd_elf32_arm_oabi_allocate_interworking_sections
  23 #define bfd_elf32_arm_get_bfd_for_interworking \
  24         bfd_elf32_arm_oabi_get_bfd_for_interworking
  25 #define bfd_elf32_arm_process_before_allocation \
  26         bfd_elf32_arm_oabi_process_before_allocation
  27 #define bfd_elf32_arm_add_glue_sections_to_bfd \
  28         bfd_elf32_arm_oabi_add_glue_sections_to_bfd
  29
  30 #include "elf/arm.h"
  31 #include "bfd.h"
  32 #include "sysdep.h"
  33 #include "libbfd.h"
  34 #include "elf-bfd.h"
  35
  36 #ifndef NUM_ELEM
  37 #define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0])
  38 #endif
  39
  40 #define TARGET_LITTLE_SYM               bfd_elf32_littlearm_oabi_vec
  41 #define TARGET_LITTLE_NAME              "elf32-littlearm-oabi"
  42 #define TARGET_BIG_SYM                  bfd_elf32_bigarm_oabi_vec
  43 #define TARGET_BIG_NAME                 "elf32-bigarm-oabi"
  44
  45 #define elf_info_to_howto               elf32_arm_info_to_howto
  46 #define elf_info_to_howto_rel           0
  47
  48 #define ARM_ELF_ABI_VERSION             0
  49 #define ARM_ELF_OS_ABI_VERSION          0
  50
  51 static reloc_howto_type * find_howto                  PARAMS ((unsigned int));
  52 static void               elf32_arm_info_to_howto     PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
  53 static reloc_howto_type * elf32_arm_reloc_type_lookup PARAMS ((bfd *, bfd_reloc_code_real_type));
  54
  55 static reloc_howto_type elf32_arm_howto_table[] =
  56   {
  57     /* No relocation.  */
  58     HOWTO (R_ARM_NONE,          /* type */
  59            0,                   /* rightshift */
  60            0,                   /* size (0 = byte, 1 = short, 2 = long) */
  61            0,                   /* bitsize */
  62            false,               /* pc_relative */
  63            0,                   /* bitpos */
  64            complain_overflow_dont,      /* complain_on_overflow */
  65            bfd_elf_generic_reloc,       /* special_function */
  66            "R_ARM_NONE",        /* name */
  67            false,               /* partial_inplace */
  68            0,                   /* src_mask */
  69            0,                   /* dst_mask */
  70            false),              /* pcrel_offset */
  71
  72     HOWTO (R_ARM_PC24,          /* type */
  73            2,                   /* rightshift */
  74            2,                   /* size (0 = byte, 1 = short, 2 = long) */
  75            24,                  /* bitsize */
  76            true,                /* pc_relative */
  77            0,                   /* bitpos */
  78            complain_overflow_signed,    /* complain_on_overflow */
  79            bfd_elf_generic_reloc,       /* special_function */
  80            "R_ARM_PC24",        /* name */
  81            false,               /* partial_inplace */
  82            0x00ffffff,          /* src_mask */
  83            0x00ffffff,          /* dst_mask */
  84            true),                       /* pcrel_offset */
  85
  86     /* 32 bit absolute.  */
  87     HOWTO (R_ARM_ABS32,         /* type */
  88            0,                   /* rightshift */
  89            2,                   /* size (0 = byte, 1 = short, 2 = long) */
  90            32,                  /* bitsize */
  91            false,               /* pc_relative */
  92            0,                   /* bitpos */
  93            complain_overflow_bitfield,  /* complain_on_overflow */
  94            bfd_elf_generic_reloc,       /* special_function */
  95            "R_ARM_ABS32",       /* name */
  96            false,               /* partial_inplace */
  97            0xffffffff,          /* src_mask */
  98            0xffffffff,          /* dst_mask */
  99            false),              /* pcrel_offset */
 100
 101     /* Standard 32bit pc-relative reloc.  */
 102     HOWTO (R_ARM_REL32,         /* type */
 103            0,                   /* rightshift */
 104            2,                   /* size (0 = byte, 1 = short, 2 = long) */
 105            32,                  /* bitsize */
 106            true,                /* pc_relative */
 107            0,                   /* bitpos */
 108            complain_overflow_bitfield,  /* complain_on_overflow */
 109            bfd_elf_generic_reloc,       /* special_function */
 110            "R_ARM_REL32",       /* name */
 111            false,               /* partial_inplace */
 112            0xffffffff,          /* src_mask */
 113            0xffffffff,          /* dst_mask */
 114            true),               /* pcrel_offset */
 115
 116     /* 8 bit absolute.  */
 117     HOWTO (R_ARM_ABS8,          /* type */
 118            0,                   /* rightshift */
 119            0,                   /* size (0 = byte, 1 = short, 2 = long) */
 120            8,                   /* bitsize */
 121            false,               /* pc_relative */
 122            0,                   /* bitpos */
 123            complain_overflow_bitfield,  /* complain_on_overflow */
 124            bfd_elf_generic_reloc,       /* special_function */
 125            "R_ARM_ABS8",        /* name */
 126            false,               /* partial_inplace */
 127            0x000000ff,          /* src_mask */
 128            0x000000ff,          /* dst_mask */
 129            false),              /* pcrel_offset */
 130
 131     /* 16 bit absolute.  */
 132     HOWTO (R_ARM_ABS16,         /* type */
 133            0,                   /* rightshift */
 134            1,                   /* size (0 = byte, 1 = short, 2 = long) */
 135            16,                  /* bitsize */
 136            false,               /* pc_relative */
 137            0,                   /* bitpos */
 138            complain_overflow_bitfield,  /* complain_on_overflow */
 139            bfd_elf_generic_reloc,       /* special_function */
 140            "R_ARM_ABS16",       /* name */
 141            false,               /* partial_inplace */
 142            0,                   /* src_mask */
 143            0,                   /* dst_mask */
 144            false),              /* pcrel_offset */
 145
 146     /* 12 bit absolute.  */
 147     HOWTO (R_ARM_ABS12,         /* type */
 148            0,                   /* rightshift */
 149            2,                   /* size (0 = byte, 1 = short, 2 = long) */
 150            12,                  /* bitsize */
 151            false,               /* pc_relative */
 152            0,                   /* bitpos */
 153            complain_overflow_bitfield,  /* complain_on_overflow */
 154            bfd_elf_generic_reloc,       /* special_function */
 155            "R_ARM_ABS12",       /* name */
 156            false,               /* partial_inplace */
 157            0x000008ff,          /* src_mask */
 158            0x000008ff,          /* dst_mask */
 159            false),              /* pcrel_offset */
 160
 161     HOWTO (R_ARM_THM_ABS5,      /* type */
 162            6,                   /* rightshift */
 163            1,                   /* size (0 = byte, 1 = short, 2 = long) */
 164            5,                   /* bitsize */
 165            false,               /* pc_relative */
 166            0,                   /* bitpos */
 167            complain_overflow_bitfield,  /* complain_on_overflow */
 168            bfd_elf_generic_reloc,       /* special_function */
 169            "R_ARM_THM_ABS5",    /* name */
 170            false,               /* partial_inplace */
 171            0x000007e0,          /* src_mask */
 172            0x000007e0,          /* dst_mask */
 173            false),              /* pcrel_offset */
 174
 175     HOWTO (R_ARM_THM_PC22,      /* type */
 176            1,                   /* rightshift */
 177            2,                   /* size (0 = byte, 1 = short, 2 = long) */
 178            23,                  /* bitsize */
 179            true,                /* pc_relative */
 180            0,                   /* bitpos */
 181            complain_overflow_signed,    /* complain_on_overflow */
 182            bfd_elf_generic_reloc,       /* special_function */
 183            "R_ARM_THM_PC22",    /* name */
 184            false,               /* partial_inplace */
 185            0x07ff07ff,          /* src_mask */
 186            0x07ff07ff,          /* dst_mask */
 187            true),                       /* pcrel_offset */
 188
 189     HOWTO (R_ARM_SBREL32,               /* type */
 190            0,                   /* rightshift */
 191            0,                   /* size (0 = byte, 1 = short, 2 = long) */
 192            0,                   /* bitsize */
 193            false,               /* pc_relative */
 194            0,                   /* bitpos */
 195            complain_overflow_dont,/* complain_on_overflow */
 196            bfd_elf_generic_reloc,       /* special_function */
 197            "R_ARM_SBREL32",     /* name */
 198            false,               /* partial_inplace */
 199            0,                   /* src_mask */
 200            0,                   /* dst_mask */
 201            false),              /* pcrel_offset */
 202
 203     HOWTO (R_ARM_AMP_VCALL9,    /* type */
 204            1,                   /* rightshift */
 205            1,                   /* size (0 = byte, 1 = short, 2 = long) */
 206            8,                   /* bitsize */
 207            true,                /* pc_relative */
 208            0,                   /* bitpos */
 209            complain_overflow_signed,    /* complain_on_overflow */
 210            bfd_elf_generic_reloc,       /* special_function */
 211            "R_ARM_AMP_VCALL9",  /* name */
 212            false,               /* partial_inplace */
 213            0x000000ff,          /* src_mask */
 214            0x000000ff,          /* dst_mask */
 215            true),               /* pcrel_offset */
 216
 217     /* 12 bit pc relative.  */
 218     HOWTO (R_ARM_THM_PC11,      /* type */
 219            1,                   /* rightshift */
 220            1,                   /* size (0 = byte, 1 = short, 2 = long) */
 221            11,                  /* bitsize */
 222            true,                /* pc_relative */
 223            0,                   /* bitpos */
 224            complain_overflow_signed,    /* complain_on_overflow */
 225            bfd_elf_generic_reloc,       /* special_function */
 226            "R_ARM_THM_PC11",    /* name */
 227            false,               /* partial_inplace */
 228            0x000007ff,          /* src_mask */
 229            0x000007ff,          /* dst_mask */
 230            true),               /* pcrel_offset */
 231
 232     /* 12 bit pc relative.  */
 233     HOWTO (R_ARM_THM_PC9,       /* type */
 234            1,                   /* rightshift */
 235            1,                   /* size (0 = byte, 1 = short, 2 = long) */
 236            8,                   /* bitsize */
 237            true,                /* pc_relative */
 238            0,                   /* bitpos */
 239            complain_overflow_signed,    /* complain_on_overflow */
 240            bfd_elf_generic_reloc,       /* special_function */
 241            "R_ARM_THM_PC9",     /* name */
 242            false,               /* partial_inplace */
 243            0x000000ff,          /* src_mask */
 244            0x000000ff,          /* dst_mask */
 245            true),               /* pcrel_offset */
 246
 247     /* GNU extension to record C++ vtable hierarchy.  */
 248     HOWTO (R_ARM_GNU_VTINHERIT, /* type */
 249            0,                     /* rightshift */
 250            2,                     /* size (0 = byte, 1 = short, 2 = long) */
 251            0,                     /* bitsize */
 252            false,                 /* pc_relative */
 253            0,                     /* bitpos */
 254            complain_overflow_dont, /* complain_on_overflow */
 255            NULL,                  /* special_function */
 256            "R_ARM_GNU_VTINHERIT", /* name */
 257            false,                 /* partial_inplace */
 258            0,                     /* src_mask */
 259            0,                     /* dst_mask */
 260            false),                /* pcrel_offset */
 261
 262     /* GNU extension to record C++ vtable member usage.  */
 263     HOWTO (R_ARM_GNU_VTENTRY,     /* type */
 264            0,                     /* rightshift */
 265            2,                     /* size (0 = byte, 1 = short, 2 = long) */
 266            0,                     /* bitsize */
 267            false,                 /* pc_relative */
 268            0,                     /* bitpos */
 269            complain_overflow_dont, /* complain_on_overflow */
 270            _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
 271            "R_ARM_GNU_VTENTRY",   /* name */
 272            false,                 /* partial_inplace */
 273            0,                     /* src_mask */
 274            0,                     /* dst_mask */
 275            false),                /* pcrel_offset */
 276
 277     /* XXX - gap in index numbering here.  */
 278
 279     HOWTO (R_ARM_PLT32,         /* type */
 280            2,                   /* rightshift */
 281            2,                   /* size (0 = byte, 1 = short, 2 = long) */
 282            26,                  /* bitsize */
 283            true,                /* pc_relative */
 284            0,                   /* bitpos */
 285            complain_overflow_bitfield,/* complain_on_overflow */
 286            bfd_elf_generic_reloc, /* special_function */
 287            "R_ARM_PLT32",       /* name */
 288            true,                /* partial_inplace */
 289            0x00ffffff,          /* src_mask */
 290            0x00ffffff,          /* dst_mask */
 291            true),                       /* pcrel_offset */
 292
 293     /* XXX - gap in index numbering here.  */
 294
 295     HOWTO (R_ARM_RREL32,        /* type */
 296            0,                   /* rightshift */
 297            0,                   /* size (0 = byte, 1 = short, 2 = long) */
 298            0,                   /* bitsize */
 299            false,               /* pc_relative */
 300            0,                   /* bitpos */
 301            complain_overflow_dont,      /* complain_on_overflow */
 302            bfd_elf_generic_reloc,       /* special_function */
 303            "R_ARM_RREL32",      /* name */
 304            false,               /* partial_inplace */
 305            0,                   /* src_mask */
 306            0,                   /* dst_mask */
 307            false),              /* pcrel_offset */
 308
 309     HOWTO (R_ARM_RABS32,        /* type */
 310            0,                   /* rightshift */
 311            0,                   /* size (0 = byte, 1 = short, 2 = long) */
 312            0,                   /* bitsize */
 313            false,               /* pc_relative */
 314            0,                   /* bitpos */
 315            complain_overflow_dont,      /* complain_on_overflow */
 316            bfd_elf_generic_reloc,       /* special_function */
 317            "R_ARM_RABS32",      /* name */
 318            false,               /* partial_inplace */
 319            0,                   /* src_mask */
 320            0,                   /* dst_mask */
 321            false),              /* pcrel_offset */
 322
 323     HOWTO (R_ARM_RPC24,         /* type */
 324            0,                   /* rightshift */
 325            0,                   /* size (0 = byte, 1 = short, 2 = long) */
 326            0,                   /* bitsize */
 327            false,               /* pc_relative */
 328            0,                   /* bitpos */
 329            complain_overflow_dont,      /* complain_on_overflow */
 330            bfd_elf_generic_reloc,       /* special_function */
 331            "R_ARM_RPC24",       /* name */
 332            false,               /* partial_inplace */
 333            0,                   /* src_mask */
 334            0,                   /* dst_mask */
 335            false),              /* pcrel_offset */
 336
 337     HOWTO (R_ARM_RBASE,         /* type */
 338            0,                   /* rightshift */
 339            0,                   /* size (0 = byte, 1 = short, 2 = long) */
 340            0,                   /* bitsize */
 341            false,               /* pc_relative */
 342            0,                   /* bitpos */
 343            complain_overflow_dont,      /* complain_on_overflow */
 344            bfd_elf_generic_reloc,       /* special_function */
 345            "R_ARM_RBASE",       /* name */
 346            false,               /* partial_inplace */
 347            0,                   /* src_mask */
 348            0,                   /* dst_mask */
 349            false)               /* pcrel_offset */
 350   };
 351
 352 /* Locate a reloc in the howto table.  This function must be used
 353    when the entry number is is > R_ARM_GNU_VTINHERIT.  */
 354
 355 static reloc_howto_type *
 356 find_howto (r_type)
 357      unsigned int r_type;
 358 {
 359   int i;
 360
 361   for (i = NUM_ELEM (elf32_arm_howto_table); i--;)
 362     if (elf32_arm_howto_table [i].type == r_type)
 363       return elf32_arm_howto_table + i;
 364
 365   return NULL;
 366 }
 367
 368 static void
 369 elf32_arm_info_to_howto (abfd, bfd_reloc, elf_reloc)
 370      bfd *abfd ATTRIBUTE_UNUSED;
 371      arelent *bfd_reloc;
 372      Elf32_Internal_Rela *elf_reloc;
 373 {
 374   unsigned int r_type;
 375
 376   r_type = ELF32_R_TYPE (elf_reloc->r_info);
 377
 378   if (r_type <= R_ARM_GNU_VTINHERIT)
 379     bfd_reloc->howto = & elf32_arm_howto_table[r_type];
 380   else
 381     bfd_reloc->howto = find_howto (r_type);
 382 }
 383
 384 struct elf32_arm_reloc_map
 385   {
 386     bfd_reloc_code_real_type bfd_reloc_val;
 387     unsigned char elf_reloc_val;
 388   };
 389
 390 static const struct elf32_arm_reloc_map elf32_arm_reloc_map[] =
 391   {
 392     {BFD_RELOC_NONE,                 R_ARM_NONE },
 393     {BFD_RELOC_ARM_PCREL_BRANCH,     R_ARM_PC24 },
 394     {BFD_RELOC_32,                   R_ARM_ABS32 },
 395     {BFD_RELOC_32_PCREL,             R_ARM_REL32 },
 396     {BFD_RELOC_8,                    R_ARM_ABS8 },
 397     {BFD_RELOC_16,                   R_ARM_ABS16 },
 398     {BFD_RELOC_ARM_OFFSET_IMM,       R_ARM_ABS12 },
 399     {BFD_RELOC_ARM_THUMB_OFFSET,     R_ARM_THM_ABS5 },
 400     {BFD_RELOC_THUMB_PCREL_BRANCH23, R_ARM_THM_PC22 },
 401     {BFD_RELOC_NONE,                 R_ARM_SBREL32 },
 402     {BFD_RELOC_NONE,                 R_ARM_AMP_VCALL9 },
 403     {BFD_RELOC_THUMB_PCREL_BRANCH12, R_ARM_THM_PC11 },
 404     {BFD_RELOC_THUMB_PCREL_BRANCH9,  R_ARM_THM_PC9 },
 405     {BFD_RELOC_VTABLE_INHERIT,       R_ARM_GNU_VTINHERIT },
 406     {BFD_RELOC_VTABLE_ENTRY,         R_ARM_GNU_VTENTRY }
 407   };
 408
 409 static reloc_howto_type *
 410 elf32_arm_reloc_type_lookup (abfd, code)
 411      bfd * abfd ATTRIBUTE_UNUSED;
 412      bfd_reloc_code_real_type code;
 413 {
 414   unsigned int i;
 415
 416   for (i = NUM_ELEM (elf32_arm_reloc_map); i--;)
 417     if (elf32_arm_reloc_map[i].bfd_reloc_val == code)
 418       return & elf32_arm_howto_table [elf32_arm_reloc_map[i].elf_reloc_val];
 419
 420   if (code == BFD_RELOC_ARM_PLT32)
 421     return find_howto (R_ARM_PLT32);
 422
 423   return NULL;
 424 }
 425
 426 #include "elf32-arm.h"