bfd/elf32-d10v.c

   1 /* D10V-specific support for 32-bit ELF
   2    Copyright (C) 1996, 1998, 1999, 2000 Free Software Foundation, Inc.
   3    Contributed by Martin Hunt (hunt@cygnus.com).
   4
   5 This file is part of BFD, the Binary File Descriptor library.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #include "bfd.h"
  22 #include "sysdep.h"
  23 #include "libbfd.h"
  24 #include "elf-bfd.h"
  25 #include "elf/d10v.h"
  26
  27 static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
  28   PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
  29 static void d10v_info_to_howto_rel
  30   PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
  31
  32 /* Use REL instead of RELA to save space */
  33 #define USE_REL
  34
  35 static reloc_howto_type elf_d10v_howto_table[] =
  36 {
  37   /* This reloc does nothing.  */
  38   HOWTO (R_D10V_NONE,           /* type */
  39          0,                     /* rightshift */
  40          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  41          32,                    /* bitsize */
  42          false,                 /* pc_relative */
  43          0,                     /* bitpos */
  44          complain_overflow_bitfield, /* complain_on_overflow */
  45          bfd_elf_generic_reloc, /* special_function */
  46          "R_D10V_NONE",         /* name */
  47          false,                 /* partial_inplace */
  48          0,                     /* src_mask */
  49          0,                     /* dst_mask */
  50          false),                /* pcrel_offset */
  51
  52   /* An PC Relative 10-bit relocation, shifted by 2  */
  53   /* right container */
  54   HOWTO (R_D10V_10_PCREL_R,     /* type */
  55          2,                     /* rightshift */
  56          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  57          10,                    /* bitsize */
  58          true,                  /* pc_relative */
  59          0,                     /* bitpos */
  60          complain_overflow_bitfield, /* complain_on_overflow */
  61          bfd_elf_generic_reloc, /* special_function */
  62          "R_D10V_10_PCREL_R",   /* name */
  63          false,                 /* partial_inplace */
  64          0xff,                  /* src_mask */
  65          0xff,                  /* dst_mask */
  66          true),                 /* pcrel_offset */
  67
  68   /* An PC Relative 10-bit relocation, shifted by 2  */
  69   /* left container */
  70   HOWTO (R_D10V_10_PCREL_L,     /* type */
  71          2,                     /* rightshift */
  72          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  73          10,                    /* bitsize */
  74          true,                  /* pc_relative */
  75          15,                    /* bitpos */
  76          complain_overflow_bitfield, /* complain_on_overflow */
  77          bfd_elf_generic_reloc, /* special_function */
  78          "R_D10V_10_PCREL_L",   /* name */
  79          false,                 /* partial_inplace */
  80          0x07f8000,                     /* src_mask */
  81          0x07f8000,             /* dst_mask */
  82          true),                 /* pcrel_offset */
  83
  84   /* A 16 bit absolute relocation */
  85   HOWTO (R_D10V_16,             /* type */
  86          0,                     /* rightshift */
  87          1,                     /* size (0 = byte, 1 = short, 2 = long) */
  88          16,                    /* bitsize */
  89          false,                 /* pc_relative */
  90          0,                     /* bitpos */
  91          complain_overflow_dont, /* complain_on_overflow */
  92          bfd_elf_generic_reloc, /* special_function */
  93          "R_D10V_16",           /* name */
  94          false,                 /* partial_inplace */
  95          0xffff,                /* src_mask */
  96          0xffff,                /* dst_mask */
  97          false),                /* pcrel_offset */
  98
  99   /* An 18 bit absolute relocation, right shifted 2 */
 100   HOWTO (R_D10V_18,             /* type */
 101          2,                     /* rightshift */
 102          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 103          18,                    /* bitsize */
 104          false,                 /* pc_relative */
 105          0,                     /* bitpos */
 106          complain_overflow_dont, /* complain_on_overflow */
 107          bfd_elf_generic_reloc, /* special_function */
 108          "R_D10V_18",           /* name */
 109          false,                 /* partial_inplace */
 110          0xffff,                /* src_mask */
 111          0xffff,                /* dst_mask */
 112          false),                /* pcrel_offset */
 113
 114   /* A relative 18 bit relocation, right shifted by 2  */
 115   HOWTO (R_D10V_18_PCREL,       /* type */
 116          2,                     /* rightshift */
 117          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 118          18,                    /* bitsize */
 119          true,                  /* pc_relative */
 120          0,                     /* bitpos */
 121          complain_overflow_signed, /* complain_on_overflow */
 122          bfd_elf_generic_reloc, /* special_function */
 123          "R_D10V_18_PCREL",     /* name */
 124          false,                 /* partial_inplace */
 125          0xffff,                /* src_mask */
 126          0xffff,                /* dst_mask */
 127          true),                 /* pcrel_offset */
 128
 129   /* A 32 bit absolute relocation */
 130   HOWTO (R_D10V_32,             /* type */
 131          0,                     /* rightshift */
 132          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 133          32,                    /* bitsize */
 134          false,                 /* pc_relative */
 135          0,                     /* bitpos */
 136          complain_overflow_bitfield, /* complain_on_overflow */
 137          bfd_elf_generic_reloc, /* special_function */
 138          "R_D10V_32",           /* name */
 139          false,                 /* partial_inplace */
 140          0xffffffff,            /* src_mask */
 141          0xffffffff,            /* dst_mask */
 142          false),                /* pcrel_offset */
 143
 144   /* GNU extension to record C++ vtable hierarchy */
 145   HOWTO (R_D10V_GNU_VTINHERIT, /* type */
 146          0,                     /* rightshift */
 147          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 148          0,                     /* bitsize */
 149          false,                 /* pc_relative */
 150          0,                     /* bitpos */
 151          complain_overflow_dont, /* complain_on_overflow */
 152          NULL,                  /* special_function */
 153          "R_D10V_GNU_VTINHERIT", /* name */
 154          false,                 /* partial_inplace */
 155          0,                     /* src_mask */
 156          0,                     /* dst_mask */
 157          false),                /* pcrel_offset */
 158
 159   /* GNU extension to record C++ vtable member usage */
 160   HOWTO (R_D10V_GNU_VTENTRY,     /* type */
 161          0,                     /* rightshift */
 162          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 163          0,                     /* bitsize */
 164          false,                 /* pc_relative */
 165          0,                     /* bitpos */
 166          complain_overflow_dont, /* complain_on_overflow */
 167          _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
 168          "R_D10V_GNU_VTENTRY",   /* name */
 169          false,                 /* partial_inplace */
 170          0,                     /* src_mask */
 171          0,                     /* dst_mask */
 172          false),                /* pcrel_offset */
 173
 174 };
 175
 176 /* Map BFD reloc types to D10V ELF reloc types.  */
 177
 178 struct d10v_reloc_map
 179 {
 180   bfd_reloc_code_real_type bfd_reloc_val;
 181   unsigned char elf_reloc_val;
 182 };
 183
 184  static const struct d10v_reloc_map d10v_reloc_map[] =
 185 {
 186   { BFD_RELOC_NONE, R_D10V_NONE, },
 187   { BFD_RELOC_D10V_10_PCREL_R, R_D10V_10_PCREL_R },
 188   { BFD_RELOC_D10V_10_PCREL_L, R_D10V_10_PCREL_L },
 189   { BFD_RELOC_16, R_D10V_16 },
 190   { BFD_RELOC_D10V_18, R_D10V_18 },
 191   { BFD_RELOC_D10V_18_PCREL, R_D10V_18_PCREL },
 192   { BFD_RELOC_32, R_D10V_32 },
 193   { BFD_RELOC_VTABLE_INHERIT, R_D10V_GNU_VTINHERIT },
 194   { BFD_RELOC_VTABLE_ENTRY, R_D10V_GNU_VTENTRY },
 195 };
 196
 197 static reloc_howto_type *
 198 bfd_elf32_bfd_reloc_type_lookup (abfd, code)
 199      bfd *abfd ATTRIBUTE_UNUSED;
 200      bfd_reloc_code_real_type code;
 201 {
 202   unsigned int i;
 203
 204   for (i = 0;
 205        i < sizeof (d10v_reloc_map) / sizeof (struct d10v_reloc_map);
 206        i++)
 207     {
 208       if (d10v_reloc_map[i].bfd_reloc_val == code)
 209         return &elf_d10v_howto_table[d10v_reloc_map[i].elf_reloc_val];
 210     }
 211
 212   return NULL;
 213 }
 214
 215 /* Set the howto pointer for an D10V ELF reloc.  */
 216
 217 static void
 218 d10v_info_to_howto_rel (abfd, cache_ptr, dst)
 219      bfd *abfd ATTRIBUTE_UNUSED;
 220      arelent *cache_ptr;
 221      Elf32_Internal_Rel *dst;
 222 {
 223   unsigned int r_type;
 224
 225   r_type = ELF32_R_TYPE (dst->r_info);
 226   BFD_ASSERT (r_type < (unsigned int) R_D10V_max);
 227   cache_ptr->howto = &elf_d10v_howto_table[r_type];
 228 }
 229
 230 static asection *
 231 elf32_d10v_gc_mark_hook (abfd, info, rel, h, sym)
 232        bfd *abfd;
 233        struct bfd_link_info *info ATTRIBUTE_UNUSED;
 234        Elf_Internal_Rela *rel;
 235        struct elf_link_hash_entry *h;
 236        Elf_Internal_Sym *sym;
 237 {
 238   if (h != NULL)
 239     {
 240       switch (ELF32_R_TYPE (rel->r_info))
 241       {
 242       case R_D10V_GNU_VTINHERIT:
 243       case R_D10V_GNU_VTENTRY:
 244         break;
 245
 246       default:
 247         switch (h->root.type)
 248           {
 249           case bfd_link_hash_defined:
 250           case bfd_link_hash_defweak:
 251             return h->root.u.def.section;
 252
 253           case bfd_link_hash_common:
 254             return h->root.u.c.p->section;
 255
 256           default:
 257             break;
 258           }
 259        }
 260      }
 261    else
 262      {
 263        if (!(elf_bad_symtab (abfd)
 264            && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
 265          && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
 266                 && sym->st_shndx != SHN_COMMON))
 267           {
 268             return bfd_section_from_elf_index (abfd, sym->st_shndx);
 269           }
 270       }
 271   return NULL;
 272 }
 273
 274 static boolean
 275 elf32_d10v_gc_sweep_hook (abfd, info, sec, relocs)
 276      bfd *abfd ATTRIBUTE_UNUSED;
 277      struct bfd_link_info *info ATTRIBUTE_UNUSED;
 278      asection *sec ATTRIBUTE_UNUSED;
 279      const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
 280 {
 281   /* we don't use got and plt entries for d10v */
 282   return true;
 283 }
 284
 285 /* Look through the relocs for a section during the first phase.
 286    Since we don't do .gots or .plts, we just need to consider the
 287    virtual table relocs for gc.  */
 288
 289 static boolean
 290 elf32_d10v_check_relocs (abfd, info, sec, relocs)
 291      bfd *abfd;
 292      struct bfd_link_info *info;
 293      asection *sec;
 294      const Elf_Internal_Rela *relocs;
 295 {
 296   Elf_Internal_Shdr *symtab_hdr;
 297   struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
 298   const Elf_Internal_Rela *rel;
 299   const Elf_Internal_Rela *rel_end;
 300
 301   if (info->relocateable)
 302     return true;
 303
 304   symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
 305   sym_hashes = elf_sym_hashes (abfd);
 306   sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
 307   if (!elf_bad_symtab (abfd))
 308     sym_hashes_end -= symtab_hdr->sh_info;
 309
 310   rel_end = relocs + sec->reloc_count;
 311   for (rel = relocs; rel < rel_end; rel++)
 312     {
 313       struct elf_link_hash_entry *h;
 314       unsigned long r_symndx;
 315
 316       r_symndx = ELF32_R_SYM (rel->r_info);
 317       if (r_symndx < symtab_hdr->sh_info)
 318         h = NULL;
 319       else
 320         h = sym_hashes[r_symndx - symtab_hdr->sh_info];
 321
 322       switch (ELF32_R_TYPE (rel->r_info))
 323         {
 324         /* This relocation describes the C++ object vtable hierarchy.
 325            Reconstruct it for later use during GC.  */
 326         case R_D10V_GNU_VTINHERIT:
 327           if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
 328             return false;
 329           break;
 330
 331         /* This relocation describes which C++ vtable entries are actually
 332            used.  Record for later use during GC.  */
 333         case R_D10V_GNU_VTENTRY:
 334           if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset))
 335             return false;
 336           break;
 337         }
 338     }
 339
 340   return true;
 341 }
 342
 343 /* Relocate a D10V ELF section.  */
 344 static boolean
 345 elf32_d10v_relocate_section (output_bfd, info, input_bfd, input_section,
 346                             contents, relocs, local_syms, local_sections)
 347      bfd *output_bfd ATTRIBUTE_UNUSED;
 348      struct bfd_link_info *info;
 349      bfd *input_bfd;
 350      asection *input_section;
 351      bfd_byte *contents;
 352      Elf_Internal_Rela *relocs;
 353      Elf_Internal_Sym *local_syms;
 354      asection **local_sections;
 355 {
 356   Elf_Internal_Shdr *symtab_hdr;
 357   struct elf_link_hash_entry **sym_hashes;
 358   Elf_Internal_Rela *rel, *relend;
 359   const char *name;
 360
 361   symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
 362   sym_hashes = elf_sym_hashes (input_bfd);
 363
 364   rel = relocs;
 365   relend = relocs + input_section->reloc_count;
 366   for (; rel < relend; rel++)
 367     {
 368       int r_type;
 369       reloc_howto_type *howto;
 370       unsigned long r_symndx;
 371       Elf_Internal_Sym *sym;
 372       asection *sec;
 373       struct elf_link_hash_entry *h;
 374       bfd_vma relocation;
 375       bfd_reloc_status_type r;
 376
 377       r_symndx = ELF32_R_SYM (rel->r_info);
 378       r_type = ELF32_R_TYPE (rel->r_info);
 379
 380       if (r_type == R_D10V_GNU_VTENTRY
 381           || r_type == R_D10V_GNU_VTINHERIT )
 382         continue;
 383
 384       howto = elf_d10v_howto_table + r_type;
 385
 386       if (info->relocateable)
 387         {
 388           /* This is a relocateable link.  We don't have to change
 389              anything, unless the reloc is against a section symbol,
 390              in which case we have to adjust according to where the
 391              section symbol winds up in the output section.  */
 392           if (r_symndx < symtab_hdr->sh_info)
 393             {
 394               sym = local_syms + r_symndx;
 395               if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
 396                 {
 397                   sec = local_sections[r_symndx];
 398                   rel->r_addend += sec->output_offset + sym->st_value;
 399                 }
 400             }
 401
 402           continue;
 403         }
 404
 405       /* This is a final link.  */
 406       h = NULL;
 407       sym = NULL;
 408       sec = NULL;
 409       if (r_symndx < symtab_hdr->sh_info)
 410         {
 411           sym = local_syms + r_symndx;
 412           sec = local_sections[r_symndx];
 413           relocation = (sec->output_section->vma
 414                         + sec->output_offset
 415                         + sym->st_value);
 416         }
 417       else
 418         {
 419           h = sym_hashes[r_symndx - symtab_hdr->sh_info];
 420           while (h->root.type == bfd_link_hash_indirect
 421                  || h->root.type == bfd_link_hash_warning)
 422             h = (struct elf_link_hash_entry *) h->root.u.i.link;
 423           if (h->root.type == bfd_link_hash_defined
 424               || h->root.type == bfd_link_hash_defweak)
 425             {
 426               sec = h->root.u.def.section;
 427               relocation = (h->root.u.def.value
 428                             + sec->output_section->vma
 429                             + sec->output_offset);
 430             }
 431           else if (h->root.type == bfd_link_hash_undefweak)
 432             relocation = 0;
 433           else
 434             {
 435               if (!((*info->callbacks->undefined_symbol)
 436                     (info, h->root.root.string, input_bfd,
 437                      input_section, rel->r_offset, true)))
 438                 return false;
 439               relocation = 0;
 440             }
 441         }
 442
 443       if (h != NULL)
 444         name = h->root.root.string;
 445       else
 446         {
 447           name = (bfd_elf_string_from_elf_section
 448                   (input_bfd, symtab_hdr->sh_link, sym->st_name));
 449           if (name == NULL || *name == '\0')
 450             name = bfd_section_name (input_bfd, sec);
 451         }
 452
 453       r = _bfd_final_link_relocate (howto, input_bfd, input_section,
 454                                     contents, rel->r_offset,
 455                                     relocation, rel->r_addend);
 456
 457       if (r != bfd_reloc_ok)
 458         {
 459           const char * msg = (const char *) 0;
 460
 461           switch (r)
 462             {
 463             case bfd_reloc_overflow:
 464               if (!((*info->callbacks->reloc_overflow)
 465                     (info, name, howto->name, (bfd_vma) 0,
 466                      input_bfd, input_section, rel->r_offset)))
 467                 return false;
 468               break;
 469
 470             case bfd_reloc_undefined:
 471               if (!((*info->callbacks->undefined_symbol)
 472                     (info, name, input_bfd, input_section,
 473                      rel->r_offset, true)))
 474                 return false;
 475               break;
 476
 477             case bfd_reloc_outofrange:
 478               msg = _ ("internal error: out of range error");
 479               goto common_error;
 480
 481             case bfd_reloc_notsupported:
 482               msg = _ ("internal error: unsupported relocation error");
 483               goto common_error;
 484
 485             case bfd_reloc_dangerous:
 486               msg = _ ("internal error: dangerous error");
 487               goto common_error;
 488
 489             default:
 490               msg = _ ("internal error: unknown error");
 491               /* fall through */
 492
 493             common_error:
 494               if (!((*info->callbacks->warning)
 495                     (info, msg, name, input_bfd, input_section,
 496                      rel->r_offset)))
 497                 return false;
 498               break;
 499             }
 500         }
 501     }
 502
 503   return true;
 504 }
 505 #define ELF_ARCH                bfd_arch_d10v
 506 #define ELF_MACHINE_CODE        EM_CYGNUS_D10V
 507 #define ELF_MAXPAGESIZE         0x1000
 508
 509 #define TARGET_BIG_SYM          bfd_elf32_d10v_vec
 510 #define TARGET_BIG_NAME         "elf32-d10v"
 511
 512 #define elf_info_to_howto                    0
 513 #define elf_info_to_howto_rel                d10v_info_to_howto_rel
 514 #define elf_backend_object_p                 0
 515 #define elf_backend_final_write_processing   0
 516 #define elf_backend_gc_mark_hook             elf32_d10v_gc_mark_hook
 517 #define elf_backend_gc_sweep_hook            elf32_d10v_gc_sweep_hook
 518 #define elf_backend_check_relocs             elf32_d10v_check_relocs
 519 #define elf_backend_relocate_section         elf32_d10v_relocate_section
 520 #define elf_backend_can_gc_sections          1
 521
 522 #include "elf32-target.h"