| 1 | /* moxie-specific support for 32-bit ELF. |
| 2 | Copyright 2009, 2010, 2012 Free Software Foundation, Inc. |
| 3 | |
| 4 | Copied from elf32-fr30.c which is.. |
| 5 | Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
| 6 | Free Software Foundation, Inc. |
| 7 | |
| 8 | This file is part of BFD, the Binary File Descriptor library. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 3 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program; if not, write to the Free Software |
| 22 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 23 | MA 02110-1301, USA. */ |
| 24 | |
| 25 | #include "sysdep.h" |
| 26 | #include "bfd.h" |
| 27 | #include "libbfd.h" |
| 28 | #include "elf-bfd.h" |
| 29 | #include "elf/moxie.h" |
| 30 | |
| 31 | /* Forward declarations. */ |
| 32 | |
| 33 | static reloc_howto_type moxie_elf_howto_table [] = |
| 34 | { |
| 35 | /* This reloc does nothing. */ |
| 36 | HOWTO (R_MOXIE_NONE, /* type */ |
| 37 | 0, /* rightshift */ |
| 38 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 39 | 32, /* bitsize */ |
| 40 | FALSE, /* pc_relative */ |
| 41 | 0, /* bitpos */ |
| 42 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 43 | bfd_elf_generic_reloc, /* special_function */ |
| 44 | "R_MOXIE_NONE", /* name */ |
| 45 | FALSE, /* partial_inplace */ |
| 46 | 0, /* src_mask */ |
| 47 | 0, /* dst_mask */ |
| 48 | FALSE), /* pcrel_offset */ |
| 49 | |
| 50 | /* A 32 bit absolute relocation. */ |
| 51 | HOWTO (R_MOXIE_32, /* type */ |
| 52 | 0, /* rightshift */ |
| 53 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 54 | 32, /* bitsize */ |
| 55 | FALSE, /* pc_relative */ |
| 56 | 0, /* bitpos */ |
| 57 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 58 | bfd_elf_generic_reloc, /* special_function */ |
| 59 | "R_MOXIE_32", /* name */ |
| 60 | FALSE, /* partial_inplace */ |
| 61 | 0x00000000, /* src_mask */ |
| 62 | 0xffffffff, /* dst_mask */ |
| 63 | FALSE), /* pcrel_offset */ |
| 64 | |
| 65 | /* A 10 bit PC-relative relocation. */ |
| 66 | HOWTO (R_MOXIE_PCREL10, /* type. */ |
| 67 | 1, /* rightshift. */ |
| 68 | 1, /* size (0 = byte, 1 = short, 2 = long). */ |
| 69 | 10, /* bitsize. */ |
| 70 | TRUE, /* pc_relative. */ |
| 71 | 0, /* bitpos. */ |
| 72 | complain_overflow_signed, /* complain_on_overflow. */ |
| 73 | bfd_elf_generic_reloc, /* special_function. */ |
| 74 | "R_MOXIE_PCREL10", /* name. */ |
| 75 | FALSE, /* partial_inplace. */ |
| 76 | 0, /* src_mask. */ |
| 77 | 0x000003FF, /* dst_mask. */ |
| 78 | TRUE), /* pcrel_offset. */ |
| 79 | }; |
| 80 | \f |
| 81 | /* Map BFD reloc types to MOXIE ELF reloc types. */ |
| 82 | |
| 83 | struct moxie_reloc_map |
| 84 | { |
| 85 | bfd_reloc_code_real_type bfd_reloc_val; |
| 86 | unsigned int moxie_reloc_val; |
| 87 | }; |
| 88 | |
| 89 | static const struct moxie_reloc_map moxie_reloc_map [] = |
| 90 | { |
| 91 | { BFD_RELOC_NONE, R_MOXIE_NONE }, |
| 92 | { BFD_RELOC_32, R_MOXIE_32 }, |
| 93 | { BFD_RELOC_MOXIE_10_PCREL, R_MOXIE_PCREL10 }, |
| 94 | }; |
| 95 | |
| 96 | static reloc_howto_type * |
| 97 | moxie_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 98 | bfd_reloc_code_real_type code) |
| 99 | { |
| 100 | unsigned int i; |
| 101 | |
| 102 | for (i = sizeof (moxie_reloc_map) / sizeof (moxie_reloc_map[0]); |
| 103 | --i;) |
| 104 | if (moxie_reloc_map [i].bfd_reloc_val == code) |
| 105 | return & moxie_elf_howto_table [moxie_reloc_map[i].moxie_reloc_val]; |
| 106 | |
| 107 | return NULL; |
| 108 | } |
| 109 | |
| 110 | static reloc_howto_type * |
| 111 | moxie_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) |
| 112 | { |
| 113 | unsigned int i; |
| 114 | |
| 115 | for (i = 0; |
| 116 | i < sizeof (moxie_elf_howto_table) / sizeof (moxie_elf_howto_table[0]); |
| 117 | i++) |
| 118 | if (moxie_elf_howto_table[i].name != NULL |
| 119 | && strcasecmp (moxie_elf_howto_table[i].name, r_name) == 0) |
| 120 | return &moxie_elf_howto_table[i]; |
| 121 | |
| 122 | return NULL; |
| 123 | } |
| 124 | |
| 125 | /* Set the howto pointer for an MOXIE ELF reloc. */ |
| 126 | |
| 127 | static void |
| 128 | moxie_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, |
| 129 | arelent *cache_ptr, |
| 130 | Elf_Internal_Rela *dst) |
| 131 | { |
| 132 | unsigned int r_type; |
| 133 | |
| 134 | r_type = ELF32_R_TYPE (dst->r_info); |
| 135 | BFD_ASSERT (r_type < (unsigned int) R_MOXIE_max); |
| 136 | cache_ptr->howto = & moxie_elf_howto_table [r_type]; |
| 137 | } |
| 138 | \f |
| 139 | /* Perform a single relocation. By default we use the standard BFD |
| 140 | routines, but a few relocs, we have to do them ourselves. */ |
| 141 | |
| 142 | static bfd_reloc_status_type |
| 143 | moxie_final_link_relocate (reloc_howto_type *howto, |
| 144 | bfd *input_bfd, |
| 145 | asection *input_section, |
| 146 | bfd_byte *contents, |
| 147 | Elf_Internal_Rela *rel, |
| 148 | bfd_vma relocation) |
| 149 | { |
| 150 | bfd_reloc_status_type r = bfd_reloc_ok; |
| 151 | |
| 152 | switch (howto->type) |
| 153 | { |
| 154 | default: |
| 155 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 156 | contents, rel->r_offset, |
| 157 | relocation, rel->r_addend); |
| 158 | } |
| 159 | |
| 160 | return r; |
| 161 | } |
| 162 | \f |
| 163 | /* Relocate an MOXIE ELF section. |
| 164 | |
| 165 | The RELOCATE_SECTION function is called by the new ELF backend linker |
| 166 | to handle the relocations for a section. |
| 167 | |
| 168 | The relocs are always passed as Rela structures; if the section |
| 169 | actually uses Rel structures, the r_addend field will always be |
| 170 | zero. |
| 171 | |
| 172 | This function is responsible for adjusting the section contents as |
| 173 | necessary, and (if using Rela relocs and generating a relocatable |
| 174 | output file) adjusting the reloc addend as necessary. |
| 175 | |
| 176 | This function does not have to worry about setting the reloc |
| 177 | address or the reloc symbol index. |
| 178 | |
| 179 | LOCAL_SYMS is a pointer to the swapped in local symbols. |
| 180 | |
| 181 | LOCAL_SECTIONS is an array giving the section in the input file |
| 182 | corresponding to the st_shndx field of each local symbol. |
| 183 | |
| 184 | The global hash table entry for the global symbols can be found |
| 185 | via elf_sym_hashes (input_bfd). |
| 186 | |
| 187 | When generating relocatable output, this function must handle |
| 188 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is |
| 189 | going to be the section symbol corresponding to the output |
| 190 | section, which means that the addend must be adjusted |
| 191 | accordingly. */ |
| 192 | |
| 193 | static bfd_boolean |
| 194 | moxie_elf_relocate_section (bfd *output_bfd, |
| 195 | struct bfd_link_info *info, |
| 196 | bfd *input_bfd, |
| 197 | asection *input_section, |
| 198 | bfd_byte *contents, |
| 199 | Elf_Internal_Rela *relocs, |
| 200 | Elf_Internal_Sym *local_syms, |
| 201 | asection **local_sections) |
| 202 | { |
| 203 | Elf_Internal_Shdr *symtab_hdr; |
| 204 | struct elf_link_hash_entry **sym_hashes; |
| 205 | Elf_Internal_Rela *rel; |
| 206 | Elf_Internal_Rela *relend; |
| 207 | |
| 208 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
| 209 | sym_hashes = elf_sym_hashes (input_bfd); |
| 210 | relend = relocs + input_section->reloc_count; |
| 211 | |
| 212 | for (rel = relocs; rel < relend; rel ++) |
| 213 | { |
| 214 | reloc_howto_type *howto; |
| 215 | unsigned long r_symndx; |
| 216 | Elf_Internal_Sym *sym; |
| 217 | asection *sec; |
| 218 | struct elf_link_hash_entry *h; |
| 219 | bfd_vma relocation; |
| 220 | bfd_reloc_status_type r; |
| 221 | const char *name; |
| 222 | int r_type; |
| 223 | |
| 224 | r_type = ELF32_R_TYPE (rel->r_info); |
| 225 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 226 | howto = moxie_elf_howto_table + r_type; |
| 227 | h = NULL; |
| 228 | sym = NULL; |
| 229 | sec = NULL; |
| 230 | |
| 231 | if (r_symndx < symtab_hdr->sh_info) |
| 232 | { |
| 233 | sym = local_syms + r_symndx; |
| 234 | sec = local_sections [r_symndx]; |
| 235 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
| 236 | |
| 237 | name = bfd_elf_string_from_elf_section |
| 238 | (input_bfd, symtab_hdr->sh_link, sym->st_name); |
| 239 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; |
| 240 | } |
| 241 | else |
| 242 | { |
| 243 | bfd_boolean unresolved_reloc, warned; |
| 244 | |
| 245 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 246 | r_symndx, symtab_hdr, sym_hashes, |
| 247 | h, sec, relocation, |
| 248 | unresolved_reloc, warned); |
| 249 | |
| 250 | name = h->root.root.string; |
| 251 | } |
| 252 | |
| 253 | if (sec != NULL && discarded_section (sec)) |
| 254 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
| 255 | rel, 1, relend, howto, 0, contents); |
| 256 | |
| 257 | if (info->relocatable) |
| 258 | continue; |
| 259 | |
| 260 | r = moxie_final_link_relocate (howto, input_bfd, input_section, |
| 261 | contents, rel, relocation); |
| 262 | |
| 263 | if (r != bfd_reloc_ok) |
| 264 | { |
| 265 | const char * msg = NULL; |
| 266 | |
| 267 | switch (r) |
| 268 | { |
| 269 | case bfd_reloc_overflow: |
| 270 | r = info->callbacks->reloc_overflow |
| 271 | (info, (h ? &h->root : NULL), name, howto->name, |
| 272 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); |
| 273 | break; |
| 274 | |
| 275 | case bfd_reloc_undefined: |
| 276 | r = info->callbacks->undefined_symbol |
| 277 | (info, name, input_bfd, input_section, rel->r_offset, |
| 278 | TRUE); |
| 279 | break; |
| 280 | |
| 281 | case bfd_reloc_outofrange: |
| 282 | msg = _("internal error: out of range error"); |
| 283 | break; |
| 284 | |
| 285 | case bfd_reloc_notsupported: |
| 286 | msg = _("internal error: unsupported relocation error"); |
| 287 | break; |
| 288 | |
| 289 | case bfd_reloc_dangerous: |
| 290 | msg = _("internal error: dangerous relocation"); |
| 291 | break; |
| 292 | |
| 293 | default: |
| 294 | msg = _("internal error: unknown error"); |
| 295 | break; |
| 296 | } |
| 297 | |
| 298 | if (msg) |
| 299 | r = info->callbacks->warning |
| 300 | (info, msg, name, input_bfd, input_section, rel->r_offset); |
| 301 | |
| 302 | if (! r) |
| 303 | return FALSE; |
| 304 | } |
| 305 | } |
| 306 | |
| 307 | return TRUE; |
| 308 | } |
| 309 | \f |
| 310 | /* Return the section that should be marked against GC for a given |
| 311 | relocation. */ |
| 312 | |
| 313 | static asection * |
| 314 | moxie_elf_gc_mark_hook (asection *sec, |
| 315 | struct bfd_link_info *info, |
| 316 | Elf_Internal_Rela *rel, |
| 317 | struct elf_link_hash_entry *h, |
| 318 | Elf_Internal_Sym *sym) |
| 319 | { |
| 320 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); |
| 321 | } |
| 322 | |
| 323 | /* Look through the relocs for a section during the first phase. |
| 324 | Since we don't do .gots or .plts, we just need to consider the |
| 325 | virtual table relocs for gc. */ |
| 326 | |
| 327 | static bfd_boolean |
| 328 | moxie_elf_check_relocs (bfd *abfd, |
| 329 | struct bfd_link_info *info, |
| 330 | asection *sec, |
| 331 | const Elf_Internal_Rela *relocs) |
| 332 | { |
| 333 | Elf_Internal_Shdr *symtab_hdr; |
| 334 | struct elf_link_hash_entry **sym_hashes; |
| 335 | const Elf_Internal_Rela *rel; |
| 336 | const Elf_Internal_Rela *rel_end; |
| 337 | |
| 338 | if (info->relocatable) |
| 339 | return TRUE; |
| 340 | |
| 341 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 342 | sym_hashes = elf_sym_hashes (abfd); |
| 343 | |
| 344 | rel_end = relocs + sec->reloc_count; |
| 345 | for (rel = relocs; rel < rel_end; rel++) |
| 346 | { |
| 347 | struct elf_link_hash_entry *h; |
| 348 | unsigned long r_symndx; |
| 349 | |
| 350 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 351 | if (r_symndx < symtab_hdr->sh_info) |
| 352 | h = NULL; |
| 353 | else |
| 354 | { |
| 355 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 356 | while (h->root.type == bfd_link_hash_indirect |
| 357 | || h->root.type == bfd_link_hash_warning) |
| 358 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 359 | } |
| 360 | } |
| 361 | |
| 362 | return TRUE; |
| 363 | } |
| 364 | \f |
| 365 | #define ELF_ARCH bfd_arch_moxie |
| 366 | #define ELF_MACHINE_CODE EM_MOXIE |
| 367 | #define ELF_MAXPAGESIZE 0x1 |
| 368 | |
| 369 | #define TARGET_BIG_SYM bfd_elf32_moxie_vec |
| 370 | #define TARGET_BIG_NAME "elf32-moxie" |
| 371 | |
| 372 | #define elf_info_to_howto_rel NULL |
| 373 | #define elf_info_to_howto moxie_info_to_howto_rela |
| 374 | #define elf_backend_relocate_section moxie_elf_relocate_section |
| 375 | #define elf_backend_gc_mark_hook moxie_elf_gc_mark_hook |
| 376 | #define elf_backend_check_relocs moxie_elf_check_relocs |
| 377 | |
| 378 | #define elf_backend_can_gc_sections 1 |
| 379 | #define elf_backend_rela_normal 1 |
| 380 | |
| 381 | #define bfd_elf32_bfd_reloc_type_lookup moxie_reloc_type_lookup |
| 382 | #define bfd_elf32_bfd_reloc_name_lookup moxie_reloc_name_lookup |
| 383 | |
| 384 | #include "elf32-target.h" |