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 enum reloc_type
  37 {
  38   R_D10V_NONE = 0,
  39   R_D10V_10_PCREL_R,
  40   R_D10V_10_PCREL_L,
  41   R_D10V_16,
  42   R_D10V_18,
  43   R_D10V_18_PCREL,
  44   R_D10V_32,
  45   R_D10V_GNU_VTINHERIT,
  46   R_D10V_GNU_VTENTRY,
  47   R_D10V_max
  48 };
  49
  50 static reloc_howto_type elf_d10v_howto_table[] =
  51 {
  52   /* This reloc does nothing.  */
  53   HOWTO (R_D10V_NONE,           /* type */
  54          0,                     /* rightshift */
  55          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  56          32,                    /* bitsize */
  57          false,                 /* pc_relative */
  58          0,                     /* bitpos */
  59          complain_overflow_bitfield, /* complain_on_overflow */
  60          bfd_elf_generic_reloc, /* special_function */
  61          "R_D10V_NONE",         /* name */
  62          false,                 /* partial_inplace */
  63          0,                     /* src_mask */
  64          0,                     /* dst_mask */
  65          false),                /* pcrel_offset */
  66
  67   /* An PC Relative 10-bit relocation, shifted by 2  */
  68   /* right container */
  69   HOWTO (R_D10V_10_PCREL_R,     /* type */
  70          2,                     /* rightshift */
  71          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  72          10,                    /* bitsize */
  73          true,                  /* pc_relative */
  74          0,                     /* bitpos */
  75          complain_overflow_bitfield, /* complain_on_overflow */
  76          bfd_elf_generic_reloc, /* special_function */
  77          "R_D10V_10_PCREL_R",   /* name */
  78          false,                 /* partial_inplace */
  79          0xff,                  /* src_mask */
  80          0xff,                  /* dst_mask */
  81          true),                 /* pcrel_offset */
  82
  83   /* An PC Relative 10-bit relocation, shifted by 2  */
  84   /* left container */
  85   HOWTO (R_D10V_10_PCREL_L,     /* type */
  86          2,                     /* rightshift */
  87          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  88          10,                    /* bitsize */
  89          true,                  /* pc_relative */
  90          15,                    /* bitpos */
  91          complain_overflow_bitfield, /* complain_on_overflow */
  92          bfd_elf_generic_reloc, /* special_function */
  93          "R_D10V_10_PCREL_L",   /* name */
  94          false,                 /* partial_inplace */
  95          0x07f8000,                     /* src_mask */
  96          0x07f8000,             /* dst_mask */
  97          true),                 /* pcrel_offset */
  98
  99   /* A 16 bit absolute relocation */
 100   HOWTO (R_D10V_16,             /* type */
 101          0,                     /* rightshift */
 102          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 103          16,                    /* 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_16",           /* name */
 109          false,                 /* partial_inplace */
 110          0xffff,                /* src_mask */
 111          0xffff,                /* dst_mask */
 112          false),                /* pcrel_offset */
 113
 114   /* An 18 bit absolute relocation, right shifted 2 */
 115   HOWTO (R_D10V_18,             /* type */
 116          2,                     /* rightshift */
 117          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 118          18,                    /* bitsize */
 119          false,                 /* pc_relative */
 120          0,                     /* bitpos */
 121          complain_overflow_dont, /* complain_on_overflow */
 122          bfd_elf_generic_reloc, /* special_function */
 123          "R_D10V_18",           /* name */
 124          false,                 /* partial_inplace */
 125          0xffff,                /* src_mask */
 126          0xffff,                /* dst_mask */
 127          false),                /* pcrel_offset */
 128
 129   /* A relative 18 bit relocation, right shifted by 2  */
 130   HOWTO (R_D10V_18_PCREL,       /* type */
 131          2,                     /* rightshift */
 132          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 133          18,                    /* bitsize */
 134          true,                  /* pc_relative */
 135          0,                     /* bitpos */
 136          complain_overflow_signed, /* complain_on_overflow */
 137          bfd_elf_generic_reloc, /* special_function */
 138          "R_D10V_18_PCREL",     /* name */
 139          false,                 /* partial_inplace */
 140          0xffff,                /* src_mask */
 141          0xffff,                /* dst_mask */
 142          true),                 /* pcrel_offset */
 143
 144   /* A 32 bit absolute relocation */
 145   HOWTO (R_D10V_32,             /* type */
 146          0,                     /* rightshift */
 147          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 148          32,                    /* bitsize */
 149          false,                 /* pc_relative */
 150          0,                     /* bitpos */
 151          complain_overflow_bitfield, /* complain_on_overflow */
 152          bfd_elf_generic_reloc, /* special_function */
 153          "R_D10V_32",           /* name */
 154          false,                 /* partial_inplace */
 155          0xffffffff,            /* src_mask */
 156          0xffffffff,            /* dst_mask */
 157          false),                /* pcrel_offset */
 158
 159   /* GNU extension to record C++ vtable hierarchy */
 160   HOWTO (R_D10V_GNU_VTINHERIT, /* 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          NULL,                  /* special_function */
 168          "R_D10V_GNU_VTINHERIT", /* name */
 169          false,                 /* partial_inplace */
 170          0,                     /* src_mask */
 171          0,                     /* dst_mask */
 172          false),                /* pcrel_offset */
 173
 174   /* GNU extension to record C++ vtable member usage */
 175   HOWTO (R_D10V_GNU_VTENTRY,     /* type */
 176          0,                     /* rightshift */
 177          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 178          0,                     /* bitsize */
 179          false,                 /* pc_relative */
 180          0,                     /* bitpos */
 181          complain_overflow_dont, /* complain_on_overflow */
 182          _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
 183          "R_D10V_GNU_VTENTRY",   /* name */
 184          false,                 /* partial_inplace */
 185          0,                     /* src_mask */
 186          0,                     /* dst_mask */
 187          false),                /* pcrel_offset */
 188
 189 };
 190
 191 /* Map BFD reloc types to D10V ELF reloc types.  */
 192
 193 struct d10v_reloc_map
 194 {
 195   bfd_reloc_code_real_type bfd_reloc_val;
 196   unsigned char elf_reloc_val;
 197 };
 198
 199  static const struct d10v_reloc_map d10v_reloc_map[] =
 200 {
 201   { BFD_RELOC_NONE, R_D10V_NONE, },
 202   { BFD_RELOC_D10V_10_PCREL_R, R_D10V_10_PCREL_R },
 203   { BFD_RELOC_D10V_10_PCREL_L, R_D10V_10_PCREL_L },
 204   { BFD_RELOC_16, R_D10V_16 },
 205   { BFD_RELOC_D10V_18, R_D10V_18 },
 206   { BFD_RELOC_D10V_18_PCREL, R_D10V_18_PCREL },
 207   { BFD_RELOC_32, R_D10V_32 },
 208   { BFD_RELOC_VTABLE_INHERIT, R_D10V_GNU_VTINHERIT },
 209   { BFD_RELOC_VTABLE_ENTRY, R_D10V_GNU_VTENTRY },
 210 };
 211
 212 static reloc_howto_type *
 213 bfd_elf32_bfd_reloc_type_lookup (abfd, code)
 214      bfd *abfd ATTRIBUTE_UNUSED;
 215      bfd_reloc_code_real_type code;
 216 {
 217   unsigned int i;
 218
 219   for (i = 0;
 220        i < sizeof (d10v_reloc_map) / sizeof (struct d10v_reloc_map);
 221        i++)
 222     {
 223       if (d10v_reloc_map[i].bfd_reloc_val == code)
 224         return &elf_d10v_howto_table[d10v_reloc_map[i].elf_reloc_val];
 225     }
 226
 227   return NULL;
 228 }
 229
 230 /* Set the howto pointer for an D10V ELF reloc.  */
 231
 232 static void
 233 d10v_info_to_howto_rel (abfd, cache_ptr, dst)
 234      bfd *abfd ATTRIBUTE_UNUSED;
 235      arelent *cache_ptr;
 236      Elf32_Internal_Rel *dst;
 237 {
 238   unsigned int r_type;
 239
 240   r_type = ELF32_R_TYPE (dst->r_info);
 241   BFD_ASSERT (r_type < (unsigned int) R_D10V_max);
 242   cache_ptr->howto = &elf_d10v_howto_table[r_type];
 243 }
 244
 245 static asection *
 246 elf32_d10v_gc_mark_hook (abfd, info, rel, h, sym)
 247        bfd *abfd;
 248        struct bfd_link_info *info ATTRIBUTE_UNUSED;
 249        Elf_Internal_Rela *rel;
 250        struct elf_link_hash_entry *h;
 251        Elf_Internal_Sym *sym;
 252 {
 253   if (h != NULL)
 254     {
 255       switch (ELF32_R_TYPE (rel->r_info))
 256       {
 257       case R_D10V_GNU_VTINHERIT:
 258       case R_D10V_GNU_VTENTRY:
 259         break;
 260
 261       default:
 262         switch (h->root.type)
 263           {
 264           case bfd_link_hash_defined:
 265           case bfd_link_hash_defweak:
 266             return h->root.u.def.section;
 267
 268           case bfd_link_hash_common:
 269             return h->root.u.c.p->section;
 270
 271           default:
 272             break;
 273           }
 274        }
 275      }
 276    else
 277      {
 278        if (!(elf_bad_symtab (abfd)
 279            && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
 280          && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
 281                 && sym->st_shndx != SHN_COMMON))
 282           {
 283             return bfd_section_from_elf_index (abfd, sym->st_shndx);
 284           }
 285       }
 286   return NULL;
 287 }
 288
 289 static boolean
 290 elf32_d10v_gc_sweep_hook (abfd, info, sec, relocs)
 291      bfd *abfd ATTRIBUTE_UNUSED;
 292      struct bfd_link_info *info ATTRIBUTE_UNUSED;
 293      asection *sec ATTRIBUTE_UNUSED;
 294      const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
 295 {
 296   /* we don't use got and plt entries for d10v */
 297   return true;
 298 }
 299
 300 /* Look through the relocs for a section during the first phase.
 301    Since we don't do .gots or .plts, we just need to consider the
 302    virtual table relocs for gc.  */
 303
 304 static boolean
 305 elf32_d10v_check_relocs (abfd, info, sec, relocs)
 306      bfd *abfd;
 307      struct bfd_link_info *info;
 308      asection *sec;
 309      const Elf_Internal_Rela *relocs;
 310 {
 311   Elf_Internal_Shdr *symtab_hdr;
 312   struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
 313   const Elf_Internal_Rela *rel;
 314   const Elf_Internal_Rela *rel_end;
 315
 316   if (info->relocateable)
 317     return true;
 318
 319   symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
 320   sym_hashes = elf_sym_hashes (abfd);
 321   sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym);
 322   if (!elf_bad_symtab (abfd))
 323     sym_hashes_end -= symtab_hdr->sh_info;
 324
 325   rel_end = relocs + sec->reloc_count;
 326   for (rel = relocs; rel < rel_end; rel++)
 327     {
 328       struct elf_link_hash_entry *h;
 329       unsigned long r_symndx;
 330
 331       r_symndx = ELF32_R_SYM (rel->r_info);
 332       if (r_symndx < symtab_hdr->sh_info)
 333         h = NULL;
 334       else
 335         h = sym_hashes[r_symndx - symtab_hdr->sh_info];
 336
 337       switch (ELF32_R_TYPE (rel->r_info))
 338         {
 339         /* This relocation describes the C++ object vtable hierarchy.
 340            Reconstruct it for later use during GC.  */
 341         case R_D10V_GNU_VTINHERIT:
 342           if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
 343             return false;
 344           break;
 345
 346         /* This relocation describes which C++ vtable entries are actually
 347            used.  Record for later use during GC.  */
 348         case R_D10V_GNU_VTENTRY:
 349           if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset))
 350             return false;
 351           break;
 352         }
 353     }
 354
 355   return true;
 356 }
 357
 358 /* Relocate a D10V ELF section.  */
 359 static boolean
 360 elf32_d10v_relocate_section (output_bfd, info, input_bfd, input_section,
 361                             contents, relocs, local_syms, local_sections)
 362      bfd *output_bfd ATTRIBUTE_UNUSED;
 363      struct bfd_link_info *info;
 364      bfd *input_bfd;
 365      asection *input_section;
 366      bfd_byte *contents;
 367      Elf_Internal_Rela *relocs;
 368      Elf_Internal_Sym *local_syms;
 369      asection **local_sections;
 370 {
 371   Elf_Internal_Shdr *symtab_hdr;
 372   struct elf_link_hash_entry **sym_hashes;
 373   Elf_Internal_Rela *rel, *relend;
 374   const char *name;
 375
 376   symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
 377   sym_hashes = elf_sym_hashes (input_bfd);
 378
 379   rel = relocs;
 380   relend = relocs + input_section->reloc_count;
 381   for (; rel < relend; rel++)
 382     {
 383       int r_type;
 384       reloc_howto_type *howto;
 385       unsigned long r_symndx;
 386       Elf_Internal_Sym *sym;
 387       asection *sec;
 388       struct elf_link_hash_entry *h;
 389       bfd_vma relocation;
 390       bfd_reloc_status_type r;
 391
 392       r_symndx = ELF32_R_SYM (rel->r_info);
 393       r_type = ELF32_R_TYPE (rel->r_info);
 394
 395       if (r_type == R_D10V_GNU_VTENTRY
 396           || r_type == R_D10V_GNU_VTINHERIT )
 397         continue;
 398
 399       howto = elf_d10v_howto_table + r_type;
 400
 401       if (info->relocateable)
 402         {
 403           /* This is a relocateable link.  We don't have to change
 404              anything, unless the reloc is against a section symbol,
 405              in which case we have to adjust according to where the
 406              section symbol winds up in the output section.  */
 407           if (r_symndx < symtab_hdr->sh_info)
 408             {
 409               sym = local_syms + r_symndx;
 410               if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
 411                 {
 412                   sec = local_sections[r_symndx];
 413                   rel->r_addend += sec->output_offset + sym->st_value;
 414                 }
 415             }
 416
 417           continue;
 418         }
 419
 420       /* This is a final link.  */
 421       h = NULL;
 422       sym = NULL;
 423       sec = NULL;
 424       if (r_symndx < symtab_hdr->sh_info)
 425         {
 426           sym = local_syms + r_symndx;
 427           sec = local_sections[r_symndx];
 428           relocation = (sec->output_section->vma
 429                         + sec->output_offset
 430                         + sym->st_value);
 431         }
 432       else
 433         {
 434           h = sym_hashes[r_symndx - symtab_hdr->sh_info];
 435           while (h->root.type == bfd_link_hash_indirect
 436                  || h->root.type == bfd_link_hash_warning)
 437             h = (struct elf_link_hash_entry *) h->root.u.i.link;
 438           if (h->root.type == bfd_link_hash_defined
 439               || h->root.type == bfd_link_hash_defweak)
 440             {
 441               sec = h->root.u.def.section;
 442               relocation = (h->root.u.def.value
 443                             + sec->output_section->vma
 444                             + sec->output_offset);
 445             }
 446           else if (h->root.type == bfd_link_hash_undefweak)
 447             relocation = 0;
 448           else
 449             {
 450               if (!((*info->callbacks->undefined_symbol)
 451                     (info, h->root.root.string, input_bfd,
 452                      input_section, rel->r_offset)))
 453                 return false;
 454               relocation = 0;
 455             }
 456         }
 457
 458       if (h != NULL)
 459         name = h->root.root.string;
 460       else
 461         {
 462           name = (bfd_elf_string_from_elf_section
 463                   (input_bfd, symtab_hdr->sh_link, sym->st_name));
 464           if (name == NULL || *name == '\0')
 465             name = bfd_section_name (input_bfd, sec);
 466         }
 467
 468       r = _bfd_final_link_relocate (howto, input_bfd, input_section,
 469                                     contents, rel->r_offset,
 470                                     relocation, rel->r_addend);
 471
 472       if (r != bfd_reloc_ok)
 473         {
 474           const char * msg = (const char *) 0;
 475
 476           switch (r)
 477             {
 478             case bfd_reloc_overflow:
 479               if (!((*info->callbacks->reloc_overflow)
 480                     (info, name, howto->name, (bfd_vma) 0,
 481                      input_bfd, input_section, rel->r_offset)))
 482                 return false;
 483               break;
 484
 485             case bfd_reloc_undefined:
 486               if (!((*info->callbacks->undefined_symbol)
 487                     (info, name, input_bfd, input_section,
 488                      rel->r_offset)))
 489                 return false;
 490               break;
 491
 492             case bfd_reloc_outofrange:
 493               msg = _ ("internal error: out of range error");
 494               goto common_error;
 495
 496             case bfd_reloc_notsupported:
 497               msg = _ ("internal error: unsupported relocation error");
 498               goto common_error;
 499
 500             case bfd_reloc_dangerous:
 501               msg = _ ("internal error: dangerous error");
 502               goto common_error;
 503
 504             default:
 505               msg = _ ("internal error: unknown error");
 506               /* fall through */
 507
 508             common_error:
 509               if (!((*info->callbacks->warning)
 510                     (info, msg, name, input_bfd, input_section,
 511                      rel->r_offset)))
 512                 return false;
 513               break;
 514             }
 515         }
 516     }
 517
 518   return true;
 519 }
 520 #define ELF_ARCH                bfd_arch_d10v
 521 #define ELF_MACHINE_CODE        EM_CYGNUS_D10V
 522 #define ELF_MAXPAGESIZE         0x1000
 523
 524 #define TARGET_BIG_SYM          bfd_elf32_d10v_vec
 525 #define TARGET_BIG_NAME         "elf32-d10v"
 526
 527 #define elf_info_to_howto                    0
 528 #define elf_info_to_howto_rel                d10v_info_to_howto_rel
 529 #define elf_backend_object_p                 0
 530 #define elf_backend_final_write_processing   0
 531 #define elf_backend_gc_mark_hook             elf32_d10v_gc_mark_hook
 532 #define elf_backend_gc_sweep_hook            elf32_d10v_gc_sweep_hook
 533 #define elf_backend_check_relocs             elf32_d10v_check_relocs
 534 #define elf_backend_relocate_section         elf32_d10v_relocate_section
 535 #define elf_backend_can_gc_sections          1
 536
 537 #include "elf32-target.h"