bfd/elf32-d10v.c

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