bfd/elfarm-nabi.c

   1 /* 32-bit ELF support for ARM new abi option.
   2    Copyright 1999 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 #include "elf/arm.h"
  21 #include "bfd.h"
  22 #include "sysdep.h"
  23 #include "libbfd.h"
  24 #include "elf-bfd.h"
  25
  26 #define USE_REL
  27
  28 #define TARGET_LITTLE_SYM               bfd_elf32_littlearm_vec
  29 #define TARGET_LITTLE_NAME              "elf32-littlearm"
  30 #define TARGET_BIG_SYM                  bfd_elf32_bigarm_vec
  31 #define TARGET_BIG_NAME                 "elf32-bigarm"
  32 #define elf_info_to_howto               0
  33 #define elf_info_to_howto_rel           elf32_arm_info_to_howto_rel
  34
  35
  36 static reloc_howto_type *elf32_arm_reloc_type_lookup
  37   PARAMS ((bfd * abfd, bfd_reloc_code_real_type code));
  38
  39 static reloc_howto_type elf32_arm_howto_table[] =
  40 {
  41   /* No relocation */
  42   HOWTO (R_ARM_NONE,            /* type */
  43          0,                     /* rightshift */
  44          0,                     /* size (0 = byte, 1 = short, 2 = long) */
  45          0,                     /* bitsize */
  46          false,                 /* pc_relative */
  47          0,                     /* bitpos */
  48          complain_overflow_dont,        /* complain_on_overflow */
  49          bfd_elf_generic_reloc, /* special_function */
  50          "R_ARM_NONE",          /* name */
  51          false,                 /* partial_inplace */
  52          0,                     /* src_mask */
  53          0,                     /* dst_mask */
  54          false),                /* pcrel_offset */
  55
  56   HOWTO (R_ARM_PC24,            /* type */
  57          2,                     /* rightshift */
  58          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  59          24,                    /* bitsize */
  60          true,                  /* pc_relative */
  61          0,                     /* bitpos */
  62          complain_overflow_signed,      /* complain_on_overflow */
  63          bfd_elf_generic_reloc, /* special_function */
  64          "R_ARM_PC24",          /* name */
  65          false,                 /* partial_inplace */
  66          0x00ffffff,            /* src_mask */
  67          0x00ffffff,            /* dst_mask */
  68          true),                 /* pcrel_offset */
  69
  70   /* 32 bit absolute */
  71   HOWTO (R_ARM_ABS32,           /* type */
  72          0,                     /* rightshift */
  73          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  74          32,                    /* bitsize */
  75          false,                 /* pc_relative */
  76          0,                     /* bitpos */
  77          complain_overflow_bitfield,    /* complain_on_overflow */
  78          bfd_elf_generic_reloc, /* special_function */
  79          "R_ARM_ABS32",         /* name */
  80          false,                 /* partial_inplace */
  81          0xffffffff,            /* src_mask */
  82          0xffffffff,            /* dst_mask */
  83          false),                /* pcrel_offset */
  84
  85   /* standard 32bit pc-relative reloc */
  86   HOWTO (R_ARM_REL32,           /* type */
  87          0,                     /* rightshift */
  88          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  89          32,                    /* bitsize */
  90          true,                  /* pc_relative */
  91          0,                     /* bitpos */
  92          complain_overflow_bitfield,    /* complain_on_overflow */
  93          bfd_elf_generic_reloc, /* special_function */
  94          "R_ARM_REL32",         /* name */
  95          false,                 /* partial_inplace */
  96          0xffffffff,            /* src_mask */
  97          0xffffffff,            /* dst_mask */
  98          true),                 /* pcrel_offset */
  99
 100   /* 8 bit absolute */
 101   HOWTO (R_ARM_PC13,            /* type */
 102          0,                     /* rightshift */
 103          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 104          8,                     /* bitsize */
 105          false,                 /* pc_relative */
 106          0,                     /* bitpos */
 107          complain_overflow_bitfield,    /* complain_on_overflow */
 108          bfd_elf_generic_reloc, /* special_function */
 109          "R_ARM_PC13",          /* name */
 110          false,                 /* partial_inplace */
 111          0x000000ff,            /* src_mask */
 112          0x000000ff,            /* dst_mask */
 113          false),                /* pcrel_offset */
 114
 115    /* 16 bit absolute */
 116   HOWTO (R_ARM_ABS16,           /* type */
 117          0,                     /* rightshift */
 118          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 119          16,                    /* bitsize */
 120          false,                 /* pc_relative */
 121          0,                     /* bitpos */
 122          complain_overflow_bitfield,    /* complain_on_overflow */
 123          bfd_elf_generic_reloc, /* special_function */
 124          "R_ARM_ABS16",         /* name */
 125          false,                 /* partial_inplace */
 126          0,                     /* src_mask */
 127          0,                     /* dst_mask */
 128          false),                /* pcrel_offset */
 129
 130   /* 12 bit absolute */
 131   HOWTO (R_ARM_ABS12,           /* type */
 132          0,                     /* rightshift */
 133          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 134          12,                    /* bitsize */
 135          false,                 /* pc_relative */
 136          0,                     /* bitpos */
 137          complain_overflow_bitfield,    /* complain_on_overflow */
 138          bfd_elf_generic_reloc, /* special_function */
 139          "R_ARM_ABS12",         /* name */
 140          false,                 /* partial_inplace */
 141          0x000008ff,            /* src_mask */
 142          0x000008ff,            /* dst_mask */
 143          false),                /* pcrel_offset */
 144
 145   HOWTO (R_ARM_THM_ABS5,        /* type */
 146          0,                     /* rightshift */
 147          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 148          5,                     /* bitsize */
 149          false,                 /* pc_relative */
 150          0,                     /* bitpos */
 151          complain_overflow_bitfield,    /* complain_on_overflow */
 152          bfd_elf_generic_reloc, /* special_function */
 153          "R_ARM_THM_ABS5",      /* name */
 154          false,                 /* partial_inplace */
 155          0x000007e0,            /* src_mask */
 156          0x000007e0,            /* dst_mask */
 157          false),                /* pcrel_offset */
 158
 159   /* 8 bit absolute */
 160   HOWTO (R_ARM_ABS8,            /* type */
 161          0,                     /* rightshift */
 162          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 163          8,                     /* bitsize */
 164          false,                 /* pc_relative */
 165          0,                     /* bitpos */
 166          complain_overflow_bitfield,    /* complain_on_overflow */
 167          bfd_elf_generic_reloc, /* special_function */
 168          "R_ARM_ABS8",          /* name */
 169          false,                 /* partial_inplace */
 170          0x000000ff,            /* src_mask */
 171          0x000000ff,            /* dst_mask */
 172          false),                /* pcrel_offset */
 173
 174   HOWTO (R_ARM_SBREL32,         /* type */
 175          0,                     /* rightshift */
 176          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 177          0,                     /* bitsize */
 178          false,                 /* pc_relative */
 179          0,                     /* bitpos */
 180          complain_overflow_dont,        /* complain_on_overflow */
 181          bfd_elf_generic_reloc, /* special_function */
 182          "R_ARM_SBREL32",       /* name */
 183          false,                 /* partial_inplace */
 184          0,                     /* src_mask */
 185          0,                     /* dst_mask */
 186          false),                /* pcrel_offset */
 187
 188   HOWTO (R_ARM_THM_PC22,        /* type */
 189          1,                     /* rightshift */
 190          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 191          22,                    /* bitsize */
 192          true,                  /* pc_relative */
 193          0,                     /* bitpos */
 194          complain_overflow_signed,      /* complain_on_overflow */
 195          bfd_elf_generic_reloc, /* special_function */
 196          "R_ARM_THM_PC22",      /* name */
 197          false,                 /* partial_inplace */
 198          0x07ff07ff,            /* src_mask */
 199          0x07ff07ff,            /* dst_mask */
 200          true),                 /* pcrel_offset */
 201
 202   HOWTO (R_ARM_THM_PC8,         /* type */
 203          1,                     /* rightshift */
 204          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 205          8,                     /* bitsize */
 206          true,                  /* pc_relative */
 207          0,                     /* bitpos */
 208          complain_overflow_signed,      /* complain_on_overflow */
 209          bfd_elf_generic_reloc, /* special_function */
 210          "R_ARM_THM_PC8",       /* name */
 211          false,                 /* partial_inplace */
 212          0x000000ff,            /* src_mask */
 213          0x000000ff,            /* dst_mask */
 214          true),                 /* pcrel_offset */
 215
 216   HOWTO (R_ARM_AMP_VCALL9,      /* type */
 217          1,                     /* rightshift */
 218          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 219          8,                     /* bitsize */
 220          true,                  /* pc_relative */
 221          0,                     /* bitpos */
 222          complain_overflow_signed,      /* complain_on_overflow */
 223          bfd_elf_generic_reloc, /* special_function */
 224          "R_ARM_AMP_VCALL9",    /* name */
 225          false,                 /* partial_inplace */
 226          0x000000ff,            /* src_mask */
 227          0x000000ff,            /* dst_mask */
 228          true),                 /* pcrel_offset */
 229
 230   HOWTO (R_ARM_SWI24,   /* type */
 231          0,                     /* rightshift */
 232          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 233          0,                     /* bitsize */
 234          false,                 /* pc_relative */
 235          0,                     /* bitpos */
 236          complain_overflow_signed,      /* complain_on_overflow */
 237          bfd_elf_generic_reloc, /* special_function */
 238          "R_ARM_SWI24", /* name */
 239          false,                 /* partial_inplace */
 240          0x00000000,            /* src_mask */
 241          0x00000000,            /* dst_mask */
 242          false),                        /* pcrel_offset */
 243
 244   HOWTO (R_ARM_THM_SWI8,        /* type */
 245          0,                     /* rightshift */
 246          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 247          0,                     /* bitsize */
 248          false,                 /* pc_relative */
 249          0,                     /* bitpos */
 250          complain_overflow_signed,      /* complain_on_overflow */
 251          bfd_elf_generic_reloc, /* special_function */
 252          "R_ARM_SWI8",  /* name */
 253          false,                 /* partial_inplace */
 254          0x00000000,            /* src_mask */
 255          0x00000000,            /* dst_mask */
 256          false),                        /* pcrel_offset */
 257
 258   HOWTO (R_ARM_RREL32,          /* type */
 259          0,                     /* rightshift */
 260          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 261          0,                     /* bitsize */
 262          false,                 /* pc_relative */
 263          0,                     /* bitpos */
 264          complain_overflow_dont,        /* complain_on_overflow */
 265          bfd_elf_generic_reloc, /* special_function */
 266          "R_ARM_RREL32",        /* name */
 267          false,                 /* partial_inplace */
 268          0,                     /* src_mask */
 269          0,                     /* dst_mask */
 270          false),                /* pcrel_offset */
 271
 272   HOWTO (R_ARM_RABS32,          /* type */
 273          0,                     /* rightshift */
 274          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 275          0,                     /* bitsize */
 276          false,                 /* pc_relative */
 277          0,                     /* bitpos */
 278          complain_overflow_dont,        /* complain_on_overflow */
 279          bfd_elf_generic_reloc, /* special_function */
 280          "R_ARM_RABS32",        /* name */
 281          false,                 /* partial_inplace */
 282          0,                     /* src_mask */
 283          0,                     /* dst_mask */
 284          false),                /* pcrel_offset */
 285
 286   HOWTO (R_ARM_RPC24,           /* type */
 287          0,                     /* rightshift */
 288          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 289          0,                     /* bitsize */
 290          false,                 /* pc_relative */
 291          0,                     /* bitpos */
 292          complain_overflow_dont,        /* complain_on_overflow */
 293          bfd_elf_generic_reloc, /* special_function */
 294          "R_ARM_RPC24",         /* name */
 295          false,                 /* partial_inplace */
 296          0,                     /* src_mask */
 297          0,                     /* dst_mask */
 298          false),                /* pcrel_offset */
 299
 300   HOWTO (R_ARM_RBASE,           /* type */
 301          0,                     /* rightshift */
 302          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 303          0,                     /* bitsize */
 304          false,                 /* pc_relative */
 305          0,                     /* bitpos */
 306          complain_overflow_dont,        /* complain_on_overflow */
 307          bfd_elf_generic_reloc, /* special_function */
 308          "R_ARM_RBASE",         /* name */
 309          false,                 /* partial_inplace */
 310          0,                     /* src_mask */
 311          0,                     /* dst_mask */
 312          false),                /* pcrel_offset */
 313
 314 };
 315
 316   /* GNU extension to record C++ vtable hierarchy */
 317 static reloc_howto_type elf32_arm_vtinherit_howto =
 318   HOWTO (R_ARM_GNU_VTINHERIT, /* type */
 319          0,                     /* rightshift */
 320          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 321          0,                     /* bitsize */
 322          false,                 /* pc_relative */
 323          0,                     /* bitpos */
 324          complain_overflow_dont, /* complain_on_overflow */
 325          NULL,                  /* special_function */
 326          "R_ARM_GNU_VTINHERIT", /* name */
 327          false,                 /* partial_inplace */
 328          0,                     /* src_mask */
 329          0,                     /* dst_mask */
 330          false);                /* pcrel_offset */
 331
 332   /* GNU extension to record C++ vtable member usage */
 333 static reloc_howto_type elf32_arm_vtentry_howto =
 334   HOWTO (R_ARM_GNU_VTENTRY,     /* type */
 335          0,                     /* rightshift */
 336          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 337          0,                     /* bitsize */
 338          false,                 /* pc_relative */
 339          0,                     /* bitpos */
 340          complain_overflow_dont, /* complain_on_overflow */
 341          _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
 342          "R_ARM_GNU_VTENTRY",   /* name */
 343          false,                 /* partial_inplace */
 344          0,                     /* src_mask */
 345          0,                     /* dst_mask */
 346          false);                /* pcrel_offset */
 347
 348   /* 12 bit pc relative */
 349 static reloc_howto_type elf32_arm_thm_pc11_howto =
 350   HOWTO (R_ARM_THM_PC11,        /* type */
 351          1,                     /* rightshift */
 352          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 353          11,                    /* bitsize */
 354          true,                  /* pc_relative */
 355          0,                     /* bitpos */
 356          complain_overflow_signed,      /* complain_on_overflow */
 357          bfd_elf_generic_reloc, /* special_function */
 358          "R_ARM_THM_PC11",      /* name */
 359          false,                 /* partial_inplace */
 360          0x000007ff,            /* src_mask */
 361          0x000007ff,            /* dst_mask */
 362          true);                 /* pcrel_offset */
 363
 364   /* 12 bit pc relative */
 365 static reloc_howto_type elf32_arm_thm_pc9_howto =
 366   HOWTO (R_ARM_THM_PC9,         /* type */
 367          1,                     /* rightshift */
 368          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 369          8,                     /* bitsize */
 370          true,                  /* pc_relative */
 371          0,                     /* bitpos */
 372          complain_overflow_signed,      /* complain_on_overflow */
 373          bfd_elf_generic_reloc, /* special_function */
 374          "R_ARM_THM_PC9",       /* name */
 375          false,                 /* partial_inplace */
 376          0x000000ff,            /* src_mask */
 377          0x000000ff,            /* dst_mask */
 378          true);                 /* pcrel_offset */
 379
 380
 381 static void
 382 elf32_arm_info_to_howto_rel (abfd, bfd_reloc, elf_reloc)
 383      bfd *abfd;
 384      arelent *bfd_reloc;
 385      Elf32_Internal_Rel *elf_reloc;
 386 {
 387      unsigned int r_type;
 388
 389      r_type = ELF32_R_TYPE (elf_reloc->r_info);
 390      if (r_type == R_ARM_GNU_VTINHERIT)
 391        bfd_reloc->howto = &elf32_arm_vtinherit_howto;
 392      else if (r_type == R_ARM_GNU_VTENTRY)
 393        bfd_reloc->howto = &elf32_arm_vtentry_howto;
 394      else if (r_type == R_ARM_THM_PC11)
 395       bfd_reloc->howto = &elf32_arm_thm_pc11_howto;
 396     else if (r_type == R_ARM_THM_PC9)
 397       bfd_reloc->howto = &elf32_arm_thm_pc9_howto;
 398      else
 399        bfd_reloc->howto = &elf32_arm_howto_table[r_type];
 400 }
 401
 402 struct elf32_arm_reloc_map
 403   {
 404     unsigned char bfd_reloc_val;
 405     unsigned char elf_reloc_val;
 406   };
 407
 408 static const struct elf32_arm_reloc_map elf32_arm_reloc_map[] =
 409 {
 410   {BFD_RELOC_NONE, R_ARM_NONE,},
 411   {BFD_RELOC_ARM_PCREL_BRANCH, R_ARM_PC24,},
 412   {BFD_RELOC_32, R_ARM_ABS32,},
 413   {BFD_RELOC_32_PCREL, R_ARM_REL32,},
 414   {BFD_RELOC_8, R_ARM_ABS8,},
 415   {BFD_RELOC_16, R_ARM_ABS16,},
 416   {BFD_RELOC_ARM_OFFSET_IMM, R_ARM_ABS12,},
 417   {BFD_RELOC_ARM_THUMB_OFFSET, R_ARM_THM_ABS5,},
 418   {BFD_RELOC_THUMB_PCREL_BRANCH23, R_ARM_THM_PC22,},
 419   {BFD_RELOC_VTABLE_INHERIT, R_ARM_GNU_VTINHERIT },
 420   {BFD_RELOC_VTABLE_ENTRY, R_ARM_GNU_VTENTRY },
 421   {BFD_RELOC_NONE, R_ARM_SBREL32,},
 422   {BFD_RELOC_NONE, R_ARM_AMP_VCALL9,},
 423   {BFD_RELOC_THUMB_PCREL_BRANCH12, R_ARM_THM_PC11,},
 424   {BFD_RELOC_THUMB_PCREL_BRANCH9, R_ARM_THM_PC9,}
 425 };
 426
 427 static reloc_howto_type *
 428 elf32_arm_reloc_type_lookup (abfd, code)
 429      bfd *abfd;
 430      bfd_reloc_code_real_type code;
 431 {
 432   unsigned int i;
 433
 434   switch (code)
 435     {
 436     case BFD_RELOC_VTABLE_INHERIT:
 437       return &elf32_arm_vtinherit_howto;
 438
 439     case BFD_RELOC_VTABLE_ENTRY:
 440       return &elf32_arm_vtentry_howto;
 441
 442     case BFD_RELOC_THUMB_PCREL_BRANCH12:
 443       return &elf32_arm_thm_pc11_howto;
 444
 445     case BFD_RELOC_THUMB_PCREL_BRANCH9:
 446       return &elf32_arm_thm_pc9_howto;
 447
 448     default:
 449       for (i = 0;
 450            i < sizeof (elf32_arm_reloc_map) / sizeof (struct elf32_arm_reloc_map);
 451            i++)
 452         {
 453           if (elf32_arm_reloc_map[i].bfd_reloc_val == code)
 454             return &elf32_arm_howto_table[elf32_arm_reloc_map[i].elf_reloc_val];
 455         }
 456
 457    }
 458   return NULL;
 459 }
 460
 461 #include "elf32-arm.h"