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