bfd/elfarm-oabi.c

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