| 1 | /* Intel 80386/80486-specific support for 32-bit ELF |
| 2 | Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 |
| 3 | Free Software Foundation, Inc. |
| 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 "bfdlink.h" |
| 24 | #include "libbfd.h" |
| 25 | #include "elf-bfd.h" |
| 26 | |
| 27 | static reloc_howto_type *elf_i386_reloc_type_lookup |
| 28 | PARAMS ((bfd *, bfd_reloc_code_real_type)); |
| 29 | static void elf_i386_info_to_howto |
| 30 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); |
| 31 | static void elf_i386_info_to_howto_rel |
| 32 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); |
| 33 | static boolean elf_i386_is_local_label_name |
| 34 | PARAMS ((bfd *, const char *)); |
| 35 | static boolean elf_i386_grok_prstatus |
| 36 | PARAMS ((bfd *abfd, Elf_Internal_Note *note)); |
| 37 | static boolean elf_i386_grok_psinfo |
| 38 | PARAMS ((bfd *abfd, Elf_Internal_Note *note)); |
| 39 | static struct bfd_hash_entry *link_hash_newfunc |
| 40 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); |
| 41 | static struct bfd_link_hash_table *elf_i386_link_hash_table_create |
| 42 | PARAMS ((bfd *)); |
| 43 | static boolean create_got_section |
| 44 | PARAMS((bfd *, struct bfd_link_info *)); |
| 45 | static boolean elf_i386_create_dynamic_sections |
| 46 | PARAMS((bfd *, struct bfd_link_info *)); |
| 47 | static void elf_i386_copy_indirect_symbol |
| 48 | PARAMS ((struct elf_link_hash_entry *, struct elf_link_hash_entry *)); |
| 49 | static int elf_i386_tls_transition |
| 50 | PARAMS ((struct bfd_link_info *, int, int)); |
| 51 | |
| 52 | static boolean elf_i386_mkobject |
| 53 | PARAMS((bfd *)); |
| 54 | static boolean elf_i386_object_p |
| 55 | PARAMS((bfd *)); |
| 56 | static boolean elf_i386_check_relocs |
| 57 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 58 | const Elf_Internal_Rela *)); |
| 59 | static asection *elf_i386_gc_mark_hook |
| 60 | PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *, |
| 61 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); |
| 62 | static boolean elf_i386_gc_sweep_hook |
| 63 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 64 | const Elf_Internal_Rela *)); |
| 65 | static boolean elf_i386_adjust_dynamic_symbol |
| 66 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); |
| 67 | static boolean allocate_dynrelocs |
| 68 | PARAMS ((struct elf_link_hash_entry *, PTR)); |
| 69 | static boolean readonly_dynrelocs |
| 70 | PARAMS ((struct elf_link_hash_entry *, PTR)); |
| 71 | static boolean elf_i386_fake_sections |
| 72 | PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *)); |
| 73 | static boolean elf_i386_size_dynamic_sections |
| 74 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 75 | static bfd_vma dtpoff_base |
| 76 | PARAMS ((struct bfd_link_info *)); |
| 77 | static bfd_vma tpoff |
| 78 | PARAMS ((struct bfd_link_info *, bfd_vma)); |
| 79 | static boolean elf_i386_relocate_section |
| 80 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 81 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); |
| 82 | static boolean elf_i386_finish_dynamic_symbol |
| 83 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, |
| 84 | Elf_Internal_Sym *)); |
| 85 | static enum elf_reloc_type_class elf_i386_reloc_type_class |
| 86 | PARAMS ((const Elf_Internal_Rela *)); |
| 87 | static boolean elf_i386_finish_dynamic_sections |
| 88 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 89 | |
| 90 | #define USE_REL 1 /* 386 uses REL relocations instead of RELA */ |
| 91 | |
| 92 | #include "elf/i386.h" |
| 93 | |
| 94 | static reloc_howto_type elf_howto_table[]= |
| 95 | { |
| 96 | HOWTO(R_386_NONE, 0, 0, 0, false, 0, complain_overflow_bitfield, |
| 97 | bfd_elf_generic_reloc, "R_386_NONE", |
| 98 | true, 0x00000000, 0x00000000, false), |
| 99 | HOWTO(R_386_32, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 100 | bfd_elf_generic_reloc, "R_386_32", |
| 101 | true, 0xffffffff, 0xffffffff, false), |
| 102 | HOWTO(R_386_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, |
| 103 | bfd_elf_generic_reloc, "R_386_PC32", |
| 104 | true, 0xffffffff, 0xffffffff, true), |
| 105 | HOWTO(R_386_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 106 | bfd_elf_generic_reloc, "R_386_GOT32", |
| 107 | true, 0xffffffff, 0xffffffff, false), |
| 108 | HOWTO(R_386_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, |
| 109 | bfd_elf_generic_reloc, "R_386_PLT32", |
| 110 | true, 0xffffffff, 0xffffffff, true), |
| 111 | HOWTO(R_386_COPY, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 112 | bfd_elf_generic_reloc, "R_386_COPY", |
| 113 | true, 0xffffffff, 0xffffffff, false), |
| 114 | HOWTO(R_386_GLOB_DAT, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 115 | bfd_elf_generic_reloc, "R_386_GLOB_DAT", |
| 116 | true, 0xffffffff, 0xffffffff, false), |
| 117 | HOWTO(R_386_JUMP_SLOT, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 118 | bfd_elf_generic_reloc, "R_386_JUMP_SLOT", |
| 119 | true, 0xffffffff, 0xffffffff, false), |
| 120 | HOWTO(R_386_RELATIVE, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 121 | bfd_elf_generic_reloc, "R_386_RELATIVE", |
| 122 | true, 0xffffffff, 0xffffffff, false), |
| 123 | HOWTO(R_386_GOTOFF, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 124 | bfd_elf_generic_reloc, "R_386_GOTOFF", |
| 125 | true, 0xffffffff, 0xffffffff, false), |
| 126 | HOWTO(R_386_GOTPC, 0, 2, 32, true, 0, complain_overflow_bitfield, |
| 127 | bfd_elf_generic_reloc, "R_386_GOTPC", |
| 128 | true, 0xffffffff, 0xffffffff, true), |
| 129 | |
| 130 | /* We have a gap in the reloc numbers here. |
| 131 | R_386_standard counts the number up to this point, and |
| 132 | R_386_ext_offset is the value to subtract from a reloc type of |
| 133 | R_386_16 thru R_386_PC8 to form an index into this table. */ |
| 134 | #define R_386_standard ((unsigned int) R_386_GOTPC + 1) |
| 135 | #define R_386_ext_offset ((unsigned int) R_386_TLS_LE - R_386_standard) |
| 136 | |
| 137 | /* The remaining relocs are a GNU extension. */ |
| 138 | HOWTO(R_386_TLS_LE, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 139 | bfd_elf_generic_reloc, "R_386_TLS_LE", |
| 140 | true, 0xffffffff, 0xffffffff, false), |
| 141 | HOWTO(R_386_TLS_GD, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 142 | bfd_elf_generic_reloc, "R_386_TLS_GD", |
| 143 | true, 0xffffffff, 0xffffffff, false), |
| 144 | HOWTO(R_386_TLS_LDM, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 145 | bfd_elf_generic_reloc, "R_386_TLS_LDM", |
| 146 | true, 0xffffffff, 0xffffffff, false), |
| 147 | HOWTO(R_386_16, 0, 1, 16, false, 0, complain_overflow_bitfield, |
| 148 | bfd_elf_generic_reloc, "R_386_16", |
| 149 | true, 0xffff, 0xffff, false), |
| 150 | HOWTO(R_386_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, |
| 151 | bfd_elf_generic_reloc, "R_386_PC16", |
| 152 | true, 0xffff, 0xffff, true), |
| 153 | HOWTO(R_386_8, 0, 0, 8, false, 0, complain_overflow_bitfield, |
| 154 | bfd_elf_generic_reloc, "R_386_8", |
| 155 | true, 0xff, 0xff, false), |
| 156 | HOWTO(R_386_PC8, 0, 0, 8, true, 0, complain_overflow_signed, |
| 157 | bfd_elf_generic_reloc, "R_386_PC8", |
| 158 | true, 0xff, 0xff, true), |
| 159 | |
| 160 | #define R_386_ext ((unsigned int) R_386_PC8 + 1 - R_386_ext_offset) |
| 161 | #define R_386_tls_offset ((unsigned int) R_386_TLS_LDO_32 - R_386_ext) |
| 162 | /* These are common with Solaris TLS implementation. */ |
| 163 | HOWTO(R_386_TLS_LDO_32, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 164 | bfd_elf_generic_reloc, "R_386_TLS_LDO_32", |
| 165 | true, 0xffffffff, 0xffffffff, false), |
| 166 | HOWTO(R_386_TLS_IE_32, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 167 | bfd_elf_generic_reloc, "R_386_TLS_IE_32", |
| 168 | true, 0xffffffff, 0xffffffff, false), |
| 169 | HOWTO(R_386_TLS_LE_32, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 170 | bfd_elf_generic_reloc, "R_386_TLS_LE_32", |
| 171 | true, 0xffffffff, 0xffffffff, false), |
| 172 | HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 173 | bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32", |
| 174 | true, 0xffffffff, 0xffffffff, false), |
| 175 | HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 176 | bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32", |
| 177 | true, 0xffffffff, 0xffffffff, false), |
| 178 | HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, false, 0, complain_overflow_bitfield, |
| 179 | bfd_elf_generic_reloc, "R_386_TLS_TPOFF32", |
| 180 | true, 0xffffffff, 0xffffffff, false), |
| 181 | |
| 182 | /* Another gap. */ |
| 183 | #define R_386_tls ((unsigned int) R_386_TLS_TPOFF32 + 1 - R_386_tls_offset) |
| 184 | #define R_386_vt_offset ((unsigned int) R_386_GNU_VTINHERIT - R_386_tls) |
| 185 | |
| 186 | /* GNU extension to record C++ vtable hierarchy. */ |
| 187 | HOWTO (R_386_GNU_VTINHERIT, /* type */ |
| 188 | 0, /* rightshift */ |
| 189 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 190 | 0, /* bitsize */ |
| 191 | false, /* pc_relative */ |
| 192 | 0, /* bitpos */ |
| 193 | complain_overflow_dont, /* complain_on_overflow */ |
| 194 | NULL, /* special_function */ |
| 195 | "R_386_GNU_VTINHERIT", /* name */ |
| 196 | false, /* partial_inplace */ |
| 197 | 0, /* src_mask */ |
| 198 | 0, /* dst_mask */ |
| 199 | false), /* pcrel_offset */ |
| 200 | |
| 201 | /* GNU extension to record C++ vtable member usage. */ |
| 202 | HOWTO (R_386_GNU_VTENTRY, /* type */ |
| 203 | 0, /* rightshift */ |
| 204 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 205 | 0, /* bitsize */ |
| 206 | false, /* pc_relative */ |
| 207 | 0, /* bitpos */ |
| 208 | complain_overflow_dont, /* complain_on_overflow */ |
| 209 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 210 | "R_386_GNU_VTENTRY", /* name */ |
| 211 | false, /* partial_inplace */ |
| 212 | 0, /* src_mask */ |
| 213 | 0, /* dst_mask */ |
| 214 | false) /* pcrel_offset */ |
| 215 | |
| 216 | #define R_386_vt ((unsigned int) R_386_GNU_VTENTRY + 1 - R_386_vt_offset) |
| 217 | |
| 218 | }; |
| 219 | |
| 220 | #ifdef DEBUG_GEN_RELOC |
| 221 | #define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) |
| 222 | #else |
| 223 | #define TRACE(str) |
| 224 | #endif |
| 225 | |
| 226 | static reloc_howto_type * |
| 227 | elf_i386_reloc_type_lookup (abfd, code) |
| 228 | bfd *abfd ATTRIBUTE_UNUSED; |
| 229 | bfd_reloc_code_real_type code; |
| 230 | { |
| 231 | switch (code) |
| 232 | { |
| 233 | case BFD_RELOC_NONE: |
| 234 | TRACE ("BFD_RELOC_NONE"); |
| 235 | return &elf_howto_table[(unsigned int) R_386_NONE ]; |
| 236 | |
| 237 | case BFD_RELOC_32: |
| 238 | TRACE ("BFD_RELOC_32"); |
| 239 | return &elf_howto_table[(unsigned int) R_386_32 ]; |
| 240 | |
| 241 | case BFD_RELOC_CTOR: |
| 242 | TRACE ("BFD_RELOC_CTOR"); |
| 243 | return &elf_howto_table[(unsigned int) R_386_32 ]; |
| 244 | |
| 245 | case BFD_RELOC_32_PCREL: |
| 246 | TRACE ("BFD_RELOC_PC32"); |
| 247 | return &elf_howto_table[(unsigned int) R_386_PC32 ]; |
| 248 | |
| 249 | case BFD_RELOC_386_GOT32: |
| 250 | TRACE ("BFD_RELOC_386_GOT32"); |
| 251 | return &elf_howto_table[(unsigned int) R_386_GOT32 ]; |
| 252 | |
| 253 | case BFD_RELOC_386_PLT32: |
| 254 | TRACE ("BFD_RELOC_386_PLT32"); |
| 255 | return &elf_howto_table[(unsigned int) R_386_PLT32 ]; |
| 256 | |
| 257 | case BFD_RELOC_386_COPY: |
| 258 | TRACE ("BFD_RELOC_386_COPY"); |
| 259 | return &elf_howto_table[(unsigned int) R_386_COPY ]; |
| 260 | |
| 261 | case BFD_RELOC_386_GLOB_DAT: |
| 262 | TRACE ("BFD_RELOC_386_GLOB_DAT"); |
| 263 | return &elf_howto_table[(unsigned int) R_386_GLOB_DAT ]; |
| 264 | |
| 265 | case BFD_RELOC_386_JUMP_SLOT: |
| 266 | TRACE ("BFD_RELOC_386_JUMP_SLOT"); |
| 267 | return &elf_howto_table[(unsigned int) R_386_JUMP_SLOT ]; |
| 268 | |
| 269 | case BFD_RELOC_386_RELATIVE: |
| 270 | TRACE ("BFD_RELOC_386_RELATIVE"); |
| 271 | return &elf_howto_table[(unsigned int) R_386_RELATIVE ]; |
| 272 | |
| 273 | case BFD_RELOC_386_GOTOFF: |
| 274 | TRACE ("BFD_RELOC_386_GOTOFF"); |
| 275 | return &elf_howto_table[(unsigned int) R_386_GOTOFF ]; |
| 276 | |
| 277 | case BFD_RELOC_386_GOTPC: |
| 278 | TRACE ("BFD_RELOC_386_GOTPC"); |
| 279 | return &elf_howto_table[(unsigned int) R_386_GOTPC ]; |
| 280 | |
| 281 | /* The remaining relocs are a GNU extension. */ |
| 282 | case BFD_RELOC_386_TLS_LE: |
| 283 | TRACE ("BFD_RELOC_386_TLS_LE"); |
| 284 | return &elf_howto_table[(unsigned int) R_386_TLS_LE - R_386_ext_offset]; |
| 285 | |
| 286 | case BFD_RELOC_386_TLS_GD: |
| 287 | TRACE ("BFD_RELOC_386_TLS_GD"); |
| 288 | return &elf_howto_table[(unsigned int) R_386_TLS_GD - R_386_ext_offset]; |
| 289 | |
| 290 | case BFD_RELOC_386_TLS_LDM: |
| 291 | TRACE ("BFD_RELOC_386_TLS_LDM"); |
| 292 | return &elf_howto_table[(unsigned int) R_386_TLS_LDM - R_386_ext_offset]; |
| 293 | |
| 294 | case BFD_RELOC_16: |
| 295 | TRACE ("BFD_RELOC_16"); |
| 296 | return &elf_howto_table[(unsigned int) R_386_16 - R_386_ext_offset]; |
| 297 | |
| 298 | case BFD_RELOC_16_PCREL: |
| 299 | TRACE ("BFD_RELOC_16_PCREL"); |
| 300 | return &elf_howto_table[(unsigned int) R_386_PC16 - R_386_ext_offset]; |
| 301 | |
| 302 | case BFD_RELOC_8: |
| 303 | TRACE ("BFD_RELOC_8"); |
| 304 | return &elf_howto_table[(unsigned int) R_386_8 - R_386_ext_offset]; |
| 305 | |
| 306 | case BFD_RELOC_8_PCREL: |
| 307 | TRACE ("BFD_RELOC_8_PCREL"); |
| 308 | return &elf_howto_table[(unsigned int) R_386_PC8 - R_386_ext_offset]; |
| 309 | |
| 310 | /* Common with Sun TLS implementation. */ |
| 311 | case BFD_RELOC_386_TLS_LDO_32: |
| 312 | TRACE ("BFD_RELOC_386_TLS_LDO_32"); |
| 313 | return &elf_howto_table[(unsigned int) R_386_TLS_LDO_32 - R_386_tls_offset]; |
| 314 | |
| 315 | case BFD_RELOC_386_TLS_IE_32: |
| 316 | TRACE ("BFD_RELOC_386_TLS_IE_32"); |
| 317 | return &elf_howto_table[(unsigned int) R_386_TLS_IE_32 - R_386_tls_offset]; |
| 318 | |
| 319 | case BFD_RELOC_386_TLS_LE_32: |
| 320 | TRACE ("BFD_RELOC_386_TLS_LE_32"); |
| 321 | return &elf_howto_table[(unsigned int) R_386_TLS_LE_32 - R_386_tls_offset]; |
| 322 | |
| 323 | case BFD_RELOC_386_TLS_DTPMOD32: |
| 324 | TRACE ("BFD_RELOC_386_TLS_DTPMOD32"); |
| 325 | return &elf_howto_table[(unsigned int) R_386_TLS_DTPMOD32 - R_386_tls_offset]; |
| 326 | |
| 327 | case BFD_RELOC_386_TLS_DTPOFF32: |
| 328 | TRACE ("BFD_RELOC_386_TLS_DTPOFF32"); |
| 329 | return &elf_howto_table[(unsigned int) R_386_TLS_DTPOFF32 - R_386_tls_offset]; |
| 330 | |
| 331 | case BFD_RELOC_386_TLS_TPOFF32: |
| 332 | TRACE ("BFD_RELOC_386_TLS_TPOFF32"); |
| 333 | return &elf_howto_table[(unsigned int) R_386_TLS_TPOFF32 - R_386_tls_offset]; |
| 334 | |
| 335 | case BFD_RELOC_VTABLE_INHERIT: |
| 336 | TRACE ("BFD_RELOC_VTABLE_INHERIT"); |
| 337 | return &elf_howto_table[(unsigned int) R_386_GNU_VTINHERIT |
| 338 | - R_386_vt_offset]; |
| 339 | |
| 340 | case BFD_RELOC_VTABLE_ENTRY: |
| 341 | TRACE ("BFD_RELOC_VTABLE_ENTRY"); |
| 342 | return &elf_howto_table[(unsigned int) R_386_GNU_VTENTRY |
| 343 | - R_386_vt_offset]; |
| 344 | |
| 345 | default: |
| 346 | break; |
| 347 | } |
| 348 | |
| 349 | TRACE ("Unknown"); |
| 350 | return 0; |
| 351 | } |
| 352 | |
| 353 | static void |
| 354 | elf_i386_info_to_howto (abfd, cache_ptr, dst) |
| 355 | bfd *abfd ATTRIBUTE_UNUSED; |
| 356 | arelent *cache_ptr ATTRIBUTE_UNUSED; |
| 357 | Elf32_Internal_Rela *dst ATTRIBUTE_UNUSED; |
| 358 | { |
| 359 | abort (); |
| 360 | } |
| 361 | |
| 362 | static void |
| 363 | elf_i386_info_to_howto_rel (abfd, cache_ptr, dst) |
| 364 | bfd *abfd ATTRIBUTE_UNUSED; |
| 365 | arelent *cache_ptr; |
| 366 | Elf32_Internal_Rel *dst; |
| 367 | { |
| 368 | unsigned int r_type = ELF32_R_TYPE (dst->r_info); |
| 369 | unsigned int indx; |
| 370 | |
| 371 | if ((indx = r_type) >= R_386_standard |
| 372 | && ((indx = r_type - R_386_ext_offset) - R_386_standard |
| 373 | >= R_386_ext - R_386_standard) |
| 374 | && ((indx = r_type - R_386_tls_offset) - R_386_ext |
| 375 | >= R_386_tls - R_386_ext) |
| 376 | && ((indx = r_type - R_386_vt_offset) - R_386_tls |
| 377 | >= R_386_vt - R_386_tls)) |
| 378 | { |
| 379 | (*_bfd_error_handler) (_("%s: invalid relocation type %d"), |
| 380 | bfd_archive_filename (abfd), (int) r_type); |
| 381 | indx = (unsigned int) R_386_NONE; |
| 382 | } |
| 383 | cache_ptr->howto = &elf_howto_table[indx]; |
| 384 | } |
| 385 | |
| 386 | /* Return whether a symbol name implies a local label. The UnixWare |
| 387 | 2.1 cc generates temporary symbols that start with .X, so we |
| 388 | recognize them here. FIXME: do other SVR4 compilers also use .X?. |
| 389 | If so, we should move the .X recognition into |
| 390 | _bfd_elf_is_local_label_name. */ |
| 391 | |
| 392 | static boolean |
| 393 | elf_i386_is_local_label_name (abfd, name) |
| 394 | bfd *abfd; |
| 395 | const char *name; |
| 396 | { |
| 397 | if (name[0] == '.' && name[1] == 'X') |
| 398 | return true; |
| 399 | |
| 400 | return _bfd_elf_is_local_label_name (abfd, name); |
| 401 | } |
| 402 | \f |
| 403 | /* Support for core dump NOTE sections. */ |
| 404 | static boolean |
| 405 | elf_i386_grok_prstatus (abfd, note) |
| 406 | bfd *abfd; |
| 407 | Elf_Internal_Note *note; |
| 408 | { |
| 409 | int offset; |
| 410 | size_t raw_size; |
| 411 | |
| 412 | switch (note->descsz) |
| 413 | { |
| 414 | default: |
| 415 | return false; |
| 416 | |
| 417 | case 144: /* Linux/i386 */ |
| 418 | /* pr_cursig */ |
| 419 | elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); |
| 420 | |
| 421 | /* pr_pid */ |
| 422 | elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); |
| 423 | |
| 424 | /* pr_reg */ |
| 425 | offset = 72; |
| 426 | raw_size = 68; |
| 427 | |
| 428 | break; |
| 429 | } |
| 430 | |
| 431 | /* Make a ".reg/999" section. */ |
| 432 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", |
| 433 | raw_size, note->descpos + offset); |
| 434 | } |
| 435 | |
| 436 | static boolean |
| 437 | elf_i386_grok_psinfo (abfd, note) |
| 438 | bfd *abfd; |
| 439 | Elf_Internal_Note *note; |
| 440 | { |
| 441 | switch (note->descsz) |
| 442 | { |
| 443 | default: |
| 444 | return false; |
| 445 | |
| 446 | case 124: /* Linux/i386 elf_prpsinfo */ |
| 447 | elf_tdata (abfd)->core_program |
| 448 | = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); |
| 449 | elf_tdata (abfd)->core_command |
| 450 | = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); |
| 451 | } |
| 452 | |
| 453 | /* Note that for some reason, a spurious space is tacked |
| 454 | onto the end of the args in some (at least one anyway) |
| 455 | implementations, so strip it off if it exists. */ |
| 456 | |
| 457 | { |
| 458 | char *command = elf_tdata (abfd)->core_command; |
| 459 | int n = strlen (command); |
| 460 | |
| 461 | if (0 < n && command[n - 1] == ' ') |
| 462 | command[n - 1] = '\0'; |
| 463 | } |
| 464 | |
| 465 | return true; |
| 466 | } |
| 467 | \f |
| 468 | /* Functions for the i386 ELF linker. |
| 469 | |
| 470 | In order to gain some understanding of code in this file without |
| 471 | knowing all the intricate details of the linker, note the |
| 472 | following: |
| 473 | |
| 474 | Functions named elf_i386_* are called by external routines, other |
| 475 | functions are only called locally. elf_i386_* functions appear |
| 476 | in this file more or less in the order in which they are called |
| 477 | from external routines. eg. elf_i386_check_relocs is called |
| 478 | early in the link process, elf_i386_finish_dynamic_sections is |
| 479 | one of the last functions. */ |
| 480 | |
| 481 | |
| 482 | /* The name of the dynamic interpreter. This is put in the .interp |
| 483 | section. */ |
| 484 | |
| 485 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" |
| 486 | |
| 487 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 488 | |
| 489 | #define PLT_ENTRY_SIZE 16 |
| 490 | |
| 491 | /* The first entry in an absolute procedure linkage table looks like |
| 492 | this. See the SVR4 ABI i386 supplement to see how this works. */ |
| 493 | |
| 494 | static const bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] = |
| 495 | { |
| 496 | 0xff, 0x35, /* pushl contents of address */ |
| 497 | 0, 0, 0, 0, /* replaced with address of .got + 4. */ |
| 498 | 0xff, 0x25, /* jmp indirect */ |
| 499 | 0, 0, 0, 0, /* replaced with address of .got + 8. */ |
| 500 | 0, 0, 0, 0 /* pad out to 16 bytes. */ |
| 501 | }; |
| 502 | |
| 503 | /* Subsequent entries in an absolute procedure linkage table look like |
| 504 | this. */ |
| 505 | |
| 506 | static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = |
| 507 | { |
| 508 | 0xff, 0x25, /* jmp indirect */ |
| 509 | 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ |
| 510 | 0x68, /* pushl immediate */ |
| 511 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 512 | 0xe9, /* jmp relative */ |
| 513 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 514 | }; |
| 515 | |
| 516 | /* The first entry in a PIC procedure linkage table look like this. */ |
| 517 | |
| 518 | static const bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] = |
| 519 | { |
| 520 | 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ |
| 521 | 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */ |
| 522 | 0, 0, 0, 0 /* pad out to 16 bytes. */ |
| 523 | }; |
| 524 | |
| 525 | /* Subsequent entries in a PIC procedure linkage table look like this. */ |
| 526 | |
| 527 | static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = |
| 528 | { |
| 529 | 0xff, 0xa3, /* jmp *offset(%ebx) */ |
| 530 | 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ |
| 531 | 0x68, /* pushl immediate */ |
| 532 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 533 | 0xe9, /* jmp relative */ |
| 534 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 535 | }; |
| 536 | |
| 537 | /* The i386 linker needs to keep track of the number of relocs that it |
| 538 | decides to copy as dynamic relocs in check_relocs for each symbol. |
| 539 | This is so that it can later discard them if they are found to be |
| 540 | unnecessary. We store the information in a field extending the |
| 541 | regular ELF linker hash table. */ |
| 542 | |
| 543 | struct elf_i386_dyn_relocs |
| 544 | { |
| 545 | struct elf_i386_dyn_relocs *next; |
| 546 | |
| 547 | /* The input section of the reloc. */ |
| 548 | asection *sec; |
| 549 | |
| 550 | /* Total number of relocs copied for the input section. */ |
| 551 | bfd_size_type count; |
| 552 | |
| 553 | /* Number of pc-relative relocs copied for the input section. */ |
| 554 | bfd_size_type pc_count; |
| 555 | }; |
| 556 | |
| 557 | /* i386 ELF linker hash entry. */ |
| 558 | |
| 559 | struct elf_i386_link_hash_entry |
| 560 | { |
| 561 | struct elf_link_hash_entry elf; |
| 562 | |
| 563 | /* Track dynamic relocs copied for this symbol. */ |
| 564 | struct elf_i386_dyn_relocs *dyn_relocs; |
| 565 | |
| 566 | enum { |
| 567 | GOT_UNKNOWN = 0, GOT_NORMAL, GOT_TLS_GD, GOT_TLS_IE |
| 568 | } tls_type; |
| 569 | }; |
| 570 | |
| 571 | #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent)) |
| 572 | |
| 573 | struct elf_i386_obj_tdata |
| 574 | { |
| 575 | struct elf_obj_tdata root; |
| 576 | |
| 577 | /* tls_type for each local got entry. */ |
| 578 | char *local_got_tls_type; |
| 579 | }; |
| 580 | |
| 581 | #define elf_i386_tdata(abfd) \ |
| 582 | ((struct elf_i386_obj_tdata *) (abfd)->tdata.any) |
| 583 | |
| 584 | #define elf_i386_local_got_tls_type(abfd) \ |
| 585 | (elf_i386_tdata (abfd)->local_got_tls_type) |
| 586 | |
| 587 | static boolean |
| 588 | elf_i386_mkobject (abfd) |
| 589 | bfd *abfd; |
| 590 | { |
| 591 | bfd_size_type amt = sizeof (struct elf_i386_obj_tdata); |
| 592 | abfd->tdata.any = bfd_zalloc (abfd, amt); |
| 593 | if (abfd->tdata.any == NULL) |
| 594 | return false; |
| 595 | return true; |
| 596 | } |
| 597 | |
| 598 | static boolean |
| 599 | elf_i386_object_p (abfd) |
| 600 | bfd *abfd; |
| 601 | { |
| 602 | /* Allocate our special target data. */ |
| 603 | struct elf_i386_obj_tdata *new_tdata; |
| 604 | bfd_size_type amt = sizeof (struct elf_i386_obj_tdata); |
| 605 | new_tdata = bfd_zalloc (abfd, amt); |
| 606 | if (new_tdata == NULL) |
| 607 | return false; |
| 608 | new_tdata->root = *abfd->tdata.elf_obj_data; |
| 609 | abfd->tdata.any = new_tdata; |
| 610 | return true; |
| 611 | } |
| 612 | |
| 613 | /* i386 ELF linker hash table. */ |
| 614 | |
| 615 | struct elf_i386_link_hash_table |
| 616 | { |
| 617 | struct elf_link_hash_table elf; |
| 618 | |
| 619 | /* Short-cuts to get to dynamic linker sections. */ |
| 620 | asection *sgot; |
| 621 | asection *sgotplt; |
| 622 | asection *srelgot; |
| 623 | asection *splt; |
| 624 | asection *srelplt; |
| 625 | asection *sdynbss; |
| 626 | asection *srelbss; |
| 627 | |
| 628 | union { |
| 629 | bfd_signed_vma refcount; |
| 630 | bfd_vma offset; |
| 631 | } tls_ldm_got; |
| 632 | |
| 633 | /* Small local sym to section mapping cache. */ |
| 634 | struct sym_sec_cache sym_sec; |
| 635 | }; |
| 636 | |
| 637 | /* Get the i386 ELF linker hash table from a link_info structure. */ |
| 638 | |
| 639 | #define elf_i386_hash_table(p) \ |
| 640 | ((struct elf_i386_link_hash_table *) ((p)->hash)) |
| 641 | |
| 642 | /* Create an entry in an i386 ELF linker hash table. */ |
| 643 | |
| 644 | static struct bfd_hash_entry * |
| 645 | link_hash_newfunc (entry, table, string) |
| 646 | struct bfd_hash_entry *entry; |
| 647 | struct bfd_hash_table *table; |
| 648 | const char *string; |
| 649 | { |
| 650 | /* Allocate the structure if it has not already been allocated by a |
| 651 | subclass. */ |
| 652 | if (entry == NULL) |
| 653 | { |
| 654 | entry = bfd_hash_allocate (table, |
| 655 | sizeof (struct elf_i386_link_hash_entry)); |
| 656 | if (entry == NULL) |
| 657 | return entry; |
| 658 | } |
| 659 | |
| 660 | /* Call the allocation method of the superclass. */ |
| 661 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); |
| 662 | if (entry != NULL) |
| 663 | { |
| 664 | struct elf_i386_link_hash_entry *eh; |
| 665 | |
| 666 | eh = (struct elf_i386_link_hash_entry *) entry; |
| 667 | eh->dyn_relocs = NULL; |
| 668 | eh->tls_type = GOT_UNKNOWN; |
| 669 | } |
| 670 | |
| 671 | return entry; |
| 672 | } |
| 673 | |
| 674 | /* Create an i386 ELF linker hash table. */ |
| 675 | |
| 676 | static struct bfd_link_hash_table * |
| 677 | elf_i386_link_hash_table_create (abfd) |
| 678 | bfd *abfd; |
| 679 | { |
| 680 | struct elf_i386_link_hash_table *ret; |
| 681 | bfd_size_type amt = sizeof (struct elf_i386_link_hash_table); |
| 682 | |
| 683 | ret = (struct elf_i386_link_hash_table *) bfd_malloc (amt); |
| 684 | if (ret == NULL) |
| 685 | return NULL; |
| 686 | |
| 687 | if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc)) |
| 688 | { |
| 689 | free (ret); |
| 690 | return NULL; |
| 691 | } |
| 692 | |
| 693 | ret->sgot = NULL; |
| 694 | ret->sgotplt = NULL; |
| 695 | ret->srelgot = NULL; |
| 696 | ret->splt = NULL; |
| 697 | ret->srelplt = NULL; |
| 698 | ret->sdynbss = NULL; |
| 699 | ret->srelbss = NULL; |
| 700 | ret->tls_ldm_got.refcount = 0; |
| 701 | ret->sym_sec.abfd = NULL; |
| 702 | |
| 703 | return &ret->elf.root; |
| 704 | } |
| 705 | |
| 706 | /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up |
| 707 | shortcuts to them in our hash table. */ |
| 708 | |
| 709 | static boolean |
| 710 | create_got_section (dynobj, info) |
| 711 | bfd *dynobj; |
| 712 | struct bfd_link_info *info; |
| 713 | { |
| 714 | struct elf_i386_link_hash_table *htab; |
| 715 | |
| 716 | if (! _bfd_elf_create_got_section (dynobj, info)) |
| 717 | return false; |
| 718 | |
| 719 | htab = elf_i386_hash_table (info); |
| 720 | htab->sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 721 | htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 722 | if (!htab->sgot || !htab->sgotplt) |
| 723 | abort (); |
| 724 | |
| 725 | htab->srelgot = bfd_make_section (dynobj, ".rel.got"); |
| 726 | if (htab->srelgot == NULL |
| 727 | || ! bfd_set_section_flags (dynobj, htab->srelgot, |
| 728 | (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS |
| 729 | | SEC_IN_MEMORY | SEC_LINKER_CREATED |
| 730 | | SEC_READONLY)) |
| 731 | || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) |
| 732 | return false; |
| 733 | return true; |
| 734 | } |
| 735 | |
| 736 | /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and |
| 737 | .rel.bss sections in DYNOBJ, and set up shortcuts to them in our |
| 738 | hash table. */ |
| 739 | |
| 740 | static boolean |
| 741 | elf_i386_create_dynamic_sections (dynobj, info) |
| 742 | bfd *dynobj; |
| 743 | struct bfd_link_info *info; |
| 744 | { |
| 745 | struct elf_i386_link_hash_table *htab; |
| 746 | |
| 747 | htab = elf_i386_hash_table (info); |
| 748 | if (!htab->sgot && !create_got_section (dynobj, info)) |
| 749 | return false; |
| 750 | |
| 751 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) |
| 752 | return false; |
| 753 | |
| 754 | htab->splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 755 | htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt"); |
| 756 | htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); |
| 757 | if (!info->shared) |
| 758 | htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss"); |
| 759 | |
| 760 | if (!htab->splt || !htab->srelplt || !htab->sdynbss |
| 761 | || (!info->shared && !htab->srelbss)) |
| 762 | abort (); |
| 763 | |
| 764 | return true; |
| 765 | } |
| 766 | |
| 767 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ |
| 768 | |
| 769 | static void |
| 770 | elf_i386_copy_indirect_symbol (dir, ind) |
| 771 | struct elf_link_hash_entry *dir, *ind; |
| 772 | { |
| 773 | struct elf_i386_link_hash_entry *edir, *eind; |
| 774 | |
| 775 | edir = (struct elf_i386_link_hash_entry *) dir; |
| 776 | eind = (struct elf_i386_link_hash_entry *) ind; |
| 777 | |
| 778 | if (eind->dyn_relocs != NULL) |
| 779 | { |
| 780 | if (edir->dyn_relocs != NULL) |
| 781 | { |
| 782 | struct elf_i386_dyn_relocs **pp; |
| 783 | struct elf_i386_dyn_relocs *p; |
| 784 | |
| 785 | if (ind->root.type == bfd_link_hash_indirect) |
| 786 | abort (); |
| 787 | |
| 788 | /* Add reloc counts against the weak sym to the strong sym |
| 789 | list. Merge any entries against the same section. */ |
| 790 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) |
| 791 | { |
| 792 | struct elf_i386_dyn_relocs *q; |
| 793 | |
| 794 | for (q = edir->dyn_relocs; q != NULL; q = q->next) |
| 795 | if (q->sec == p->sec) |
| 796 | { |
| 797 | q->pc_count += p->pc_count; |
| 798 | q->count += p->count; |
| 799 | *pp = p->next; |
| 800 | break; |
| 801 | } |
| 802 | if (q == NULL) |
| 803 | pp = &p->next; |
| 804 | } |
| 805 | *pp = edir->dyn_relocs; |
| 806 | } |
| 807 | |
| 808 | edir->dyn_relocs = eind->dyn_relocs; |
| 809 | eind->dyn_relocs = NULL; |
| 810 | } |
| 811 | |
| 812 | if (ind->root.type == bfd_link_hash_indirect |
| 813 | && dir->got.refcount <= 0) |
| 814 | { |
| 815 | edir->tls_type = eind->tls_type; |
| 816 | eind->tls_type = GOT_UNKNOWN; |
| 817 | } |
| 818 | _bfd_elf_link_hash_copy_indirect (dir, ind); |
| 819 | } |
| 820 | |
| 821 | static int |
| 822 | elf_i386_tls_transition (info, r_type, is_local) |
| 823 | struct bfd_link_info *info; |
| 824 | int r_type; |
| 825 | int is_local; |
| 826 | { |
| 827 | if (info->shared) |
| 828 | return r_type; |
| 829 | |
| 830 | switch (r_type) |
| 831 | { |
| 832 | case R_386_TLS_GD: |
| 833 | case R_386_TLS_IE_32: |
| 834 | if (is_local) |
| 835 | return R_386_TLS_LE_32; |
| 836 | return R_386_TLS_IE_32; |
| 837 | case R_386_TLS_LDM: |
| 838 | return R_386_TLS_LE_32; |
| 839 | } |
| 840 | |
| 841 | return r_type; |
| 842 | } |
| 843 | |
| 844 | /* Look through the relocs for a section during the first phase, and |
| 845 | calculate needed space in the global offset table, procedure linkage |
| 846 | table, and dynamic reloc sections. */ |
| 847 | |
| 848 | static boolean |
| 849 | elf_i386_check_relocs (abfd, info, sec, relocs) |
| 850 | bfd *abfd; |
| 851 | struct bfd_link_info *info; |
| 852 | asection *sec; |
| 853 | const Elf_Internal_Rela *relocs; |
| 854 | { |
| 855 | struct elf_i386_link_hash_table *htab; |
| 856 | Elf_Internal_Shdr *symtab_hdr; |
| 857 | struct elf_link_hash_entry **sym_hashes; |
| 858 | const Elf_Internal_Rela *rel; |
| 859 | const Elf_Internal_Rela *rel_end; |
| 860 | asection *sreloc; |
| 861 | |
| 862 | if (info->relocateable) |
| 863 | return true; |
| 864 | |
| 865 | htab = elf_i386_hash_table (info); |
| 866 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 867 | sym_hashes = elf_sym_hashes (abfd); |
| 868 | |
| 869 | sreloc = NULL; |
| 870 | |
| 871 | rel_end = relocs + sec->reloc_count; |
| 872 | for (rel = relocs; rel < rel_end; rel++) |
| 873 | { |
| 874 | unsigned int r_type; |
| 875 | unsigned long r_symndx; |
| 876 | struct elf_link_hash_entry *h; |
| 877 | |
| 878 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 879 | r_type = ELF32_R_TYPE (rel->r_info); |
| 880 | |
| 881 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| 882 | { |
| 883 | (*_bfd_error_handler) (_("%s: bad symbol index: %d"), |
| 884 | bfd_archive_filename (abfd), |
| 885 | r_symndx); |
| 886 | return false; |
| 887 | } |
| 888 | |
| 889 | if (r_symndx < symtab_hdr->sh_info) |
| 890 | h = NULL; |
| 891 | else |
| 892 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 893 | |
| 894 | r_type = elf_i386_tls_transition (info, r_type, h == NULL); |
| 895 | |
| 896 | switch (r_type) |
| 897 | { |
| 898 | case R_386_TLS_IE_32: |
| 899 | if (info->shared) |
| 900 | info->flags |= DF_STATIC_TLS; |
| 901 | /* FALLTHROUGH */ |
| 902 | case R_386_GOT32: |
| 903 | case R_386_TLS_GD: |
| 904 | /* This symbol requires a global offset table entry. */ |
| 905 | { |
| 906 | int tls_type, old_tls_type; |
| 907 | |
| 908 | switch (r_type) |
| 909 | { |
| 910 | default: |
| 911 | case R_386_GOT32: tls_type = GOT_NORMAL; break; |
| 912 | case R_386_TLS_GD: tls_type = GOT_TLS_GD; break; |
| 913 | case R_386_TLS_IE_32: tls_type = GOT_TLS_IE; break; |
| 914 | } |
| 915 | |
| 916 | if (h != NULL) |
| 917 | { |
| 918 | h->got.refcount += 1; |
| 919 | old_tls_type = elf_i386_hash_entry(h)->tls_type; |
| 920 | } |
| 921 | else |
| 922 | { |
| 923 | bfd_signed_vma *local_got_refcounts; |
| 924 | |
| 925 | /* This is a global offset table entry for a local symbol. */ |
| 926 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 927 | if (local_got_refcounts == NULL) |
| 928 | { |
| 929 | bfd_size_type size; |
| 930 | |
| 931 | size = symtab_hdr->sh_info; |
| 932 | size *= (sizeof (bfd_signed_vma) + sizeof(char)); |
| 933 | local_got_refcounts = ((bfd_signed_vma *) |
| 934 | bfd_zalloc (abfd, size)); |
| 935 | if (local_got_refcounts == NULL) |
| 936 | return false; |
| 937 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
| 938 | elf_i386_local_got_tls_type (abfd) |
| 939 | = (char *) (local_got_refcounts + symtab_hdr->sh_info); |
| 940 | } |
| 941 | local_got_refcounts[r_symndx] += 1; |
| 942 | old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx]; |
| 943 | } |
| 944 | |
| 945 | /* If a TLS symbol is accessed using IE at least once, |
| 946 | there is no point to use dynamic model for it. */ |
| 947 | if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN |
| 948 | && (old_tls_type != GOT_TLS_GD || tls_type != GOT_TLS_IE)) |
| 949 | { |
| 950 | if (old_tls_type == GOT_TLS_IE && tls_type == GOT_TLS_GD) |
| 951 | tls_type = GOT_TLS_IE; |
| 952 | else |
| 953 | { |
| 954 | (*_bfd_error_handler) |
| 955 | (_("%s: `%s' accessed both as normal and thread local symbol"), |
| 956 | bfd_archive_filename (abfd), h->root.root.string); |
| 957 | return false; |
| 958 | } |
| 959 | } |
| 960 | |
| 961 | if (old_tls_type != tls_type) |
| 962 | { |
| 963 | if (h != NULL) |
| 964 | elf_i386_hash_entry (h)->tls_type = tls_type; |
| 965 | else |
| 966 | elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type; |
| 967 | } |
| 968 | } |
| 969 | /* Fall through */ |
| 970 | |
| 971 | case R_386_GOTOFF: |
| 972 | case R_386_GOTPC: |
| 973 | create_got: |
| 974 | if (htab->sgot == NULL) |
| 975 | { |
| 976 | if (htab->elf.dynobj == NULL) |
| 977 | htab->elf.dynobj = abfd; |
| 978 | if (!create_got_section (htab->elf.dynobj, info)) |
| 979 | return false; |
| 980 | } |
| 981 | break; |
| 982 | |
| 983 | case R_386_TLS_LDM: |
| 984 | htab->tls_ldm_got.refcount += 1; |
| 985 | goto create_got; |
| 986 | |
| 987 | case R_386_PLT32: |
| 988 | /* This symbol requires a procedure linkage table entry. We |
| 989 | actually build the entry in adjust_dynamic_symbol, |
| 990 | because this might be a case of linking PIC code which is |
| 991 | never referenced by a dynamic object, in which case we |
| 992 | don't need to generate a procedure linkage table entry |
| 993 | after all. */ |
| 994 | |
| 995 | /* If this is a local symbol, we resolve it directly without |
| 996 | creating a procedure linkage table entry. */ |
| 997 | if (h == NULL) |
| 998 | continue; |
| 999 | |
| 1000 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
| 1001 | h->plt.refcount += 1; |
| 1002 | break; |
| 1003 | |
| 1004 | case R_386_32: |
| 1005 | case R_386_PC32: |
| 1006 | if (h != NULL && !info->shared) |
| 1007 | { |
| 1008 | /* If this reloc is in a read-only section, we might |
| 1009 | need a copy reloc. We can't check reliably at this |
| 1010 | stage whether the section is read-only, as input |
| 1011 | sections have not yet been mapped to output sections. |
| 1012 | Tentatively set the flag for now, and correct in |
| 1013 | adjust_dynamic_symbol. */ |
| 1014 | h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; |
| 1015 | |
| 1016 | /* We may need a .plt entry if the function this reloc |
| 1017 | refers to is in a shared lib. */ |
| 1018 | h->plt.refcount += 1; |
| 1019 | } |
| 1020 | |
| 1021 | /* If we are creating a shared library, and this is a reloc |
| 1022 | against a global symbol, or a non PC relative reloc |
| 1023 | against a local symbol, then we need to copy the reloc |
| 1024 | into the shared library. However, if we are linking with |
| 1025 | -Bsymbolic, we do not need to copy a reloc against a |
| 1026 | global symbol which is defined in an object we are |
| 1027 | including in the link (i.e., DEF_REGULAR is set). At |
| 1028 | this point we have not seen all the input files, so it is |
| 1029 | possible that DEF_REGULAR is not set now but will be set |
| 1030 | later (it is never cleared). In case of a weak definition, |
| 1031 | DEF_REGULAR may be cleared later by a strong definition in |
| 1032 | a shared library. We account for that possibility below by |
| 1033 | storing information in the relocs_copied field of the hash |
| 1034 | table entry. A similar situation occurs when creating |
| 1035 | shared libraries and symbol visibility changes render the |
| 1036 | symbol local. |
| 1037 | |
| 1038 | If on the other hand, we are creating an executable, we |
| 1039 | may need to keep relocations for symbols satisfied by a |
| 1040 | dynamic library if we manage to avoid copy relocs for the |
| 1041 | symbol. */ |
| 1042 | if ((info->shared |
| 1043 | && (sec->flags & SEC_ALLOC) != 0 |
| 1044 | && (r_type != R_386_PC32 |
| 1045 | || (h != NULL |
| 1046 | && (! info->symbolic |
| 1047 | || h->root.type == bfd_link_hash_defweak |
| 1048 | || (h->elf_link_hash_flags |
| 1049 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| 1050 | || (!info->shared |
| 1051 | && (sec->flags & SEC_ALLOC) != 0 |
| 1052 | && h != NULL |
| 1053 | && (h->root.type == bfd_link_hash_defweak |
| 1054 | || (h->elf_link_hash_flags |
| 1055 | & ELF_LINK_HASH_DEF_REGULAR) == 0))) |
| 1056 | { |
| 1057 | struct elf_i386_dyn_relocs *p; |
| 1058 | struct elf_i386_dyn_relocs **head; |
| 1059 | |
| 1060 | /* We must copy these reloc types into the output file. |
| 1061 | Create a reloc section in dynobj and make room for |
| 1062 | this reloc. */ |
| 1063 | if (sreloc == NULL) |
| 1064 | { |
| 1065 | const char *name; |
| 1066 | bfd *dynobj; |
| 1067 | unsigned int strndx = elf_elfheader (abfd)->e_shstrndx; |
| 1068 | unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name; |
| 1069 | |
| 1070 | name = bfd_elf_string_from_elf_section (abfd, strndx, shnam); |
| 1071 | if (name == NULL) |
| 1072 | return false; |
| 1073 | |
| 1074 | if (strncmp (name, ".rel", 4) != 0 |
| 1075 | || strcmp (bfd_get_section_name (abfd, sec), |
| 1076 | name + 4) != 0) |
| 1077 | { |
| 1078 | (*_bfd_error_handler) |
| 1079 | (_("%s: bad relocation section name `%s\'"), |
| 1080 | bfd_archive_filename (abfd), name); |
| 1081 | } |
| 1082 | |
| 1083 | if (htab->elf.dynobj == NULL) |
| 1084 | htab->elf.dynobj = abfd; |
| 1085 | |
| 1086 | dynobj = htab->elf.dynobj; |
| 1087 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 1088 | if (sreloc == NULL) |
| 1089 | { |
| 1090 | flagword flags; |
| 1091 | |
| 1092 | sreloc = bfd_make_section (dynobj, name); |
| 1093 | flags = (SEC_HAS_CONTENTS | SEC_READONLY |
| 1094 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); |
| 1095 | if ((sec->flags & SEC_ALLOC) != 0) |
| 1096 | flags |= SEC_ALLOC | SEC_LOAD; |
| 1097 | if (sreloc == NULL |
| 1098 | || ! bfd_set_section_flags (dynobj, sreloc, flags) |
| 1099 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) |
| 1100 | return false; |
| 1101 | } |
| 1102 | elf_section_data (sec)->sreloc = sreloc; |
| 1103 | } |
| 1104 | |
| 1105 | /* If this is a global symbol, we count the number of |
| 1106 | relocations we need for this symbol. */ |
| 1107 | if (h != NULL) |
| 1108 | { |
| 1109 | head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs; |
| 1110 | } |
| 1111 | else |
| 1112 | { |
| 1113 | /* Track dynamic relocs needed for local syms too. |
| 1114 | We really need local syms available to do this |
| 1115 | easily. Oh well. */ |
| 1116 | |
| 1117 | asection *s; |
| 1118 | s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, |
| 1119 | sec, r_symndx); |
| 1120 | if (s == NULL) |
| 1121 | return false; |
| 1122 | |
| 1123 | head = ((struct elf_i386_dyn_relocs **) |
| 1124 | &elf_section_data (s)->local_dynrel); |
| 1125 | } |
| 1126 | |
| 1127 | p = *head; |
| 1128 | if (p == NULL || p->sec != sec) |
| 1129 | { |
| 1130 | bfd_size_type amt = sizeof *p; |
| 1131 | p = ((struct elf_i386_dyn_relocs *) |
| 1132 | bfd_alloc (htab->elf.dynobj, amt)); |
| 1133 | if (p == NULL) |
| 1134 | return false; |
| 1135 | p->next = *head; |
| 1136 | *head = p; |
| 1137 | p->sec = sec; |
| 1138 | p->count = 0; |
| 1139 | p->pc_count = 0; |
| 1140 | } |
| 1141 | |
| 1142 | p->count += 1; |
| 1143 | if (r_type == R_386_PC32) |
| 1144 | p->pc_count += 1; |
| 1145 | } |
| 1146 | break; |
| 1147 | |
| 1148 | /* This relocation describes the C++ object vtable hierarchy. |
| 1149 | Reconstruct it for later use during GC. */ |
| 1150 | case R_386_GNU_VTINHERIT: |
| 1151 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 1152 | return false; |
| 1153 | break; |
| 1154 | |
| 1155 | /* This relocation describes which C++ vtable entries are actually |
| 1156 | used. Record for later use during GC. */ |
| 1157 | case R_386_GNU_VTENTRY: |
| 1158 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset)) |
| 1159 | return false; |
| 1160 | break; |
| 1161 | |
| 1162 | case R_386_TLS_LE_32: |
| 1163 | case R_386_TLS_LE: |
| 1164 | if (info->shared) |
| 1165 | { |
| 1166 | (*_bfd_error_handler) (_("%s: TLS local exec code cannot be linked into shared objects"), |
| 1167 | bfd_archive_filename (abfd)); |
| 1168 | return false; |
| 1169 | } |
| 1170 | break; |
| 1171 | |
| 1172 | default: |
| 1173 | break; |
| 1174 | } |
| 1175 | } |
| 1176 | |
| 1177 | return true; |
| 1178 | } |
| 1179 | |
| 1180 | /* Return the section that should be marked against GC for a given |
| 1181 | relocation. */ |
| 1182 | |
| 1183 | static asection * |
| 1184 | elf_i386_gc_mark_hook (sec, info, rel, h, sym) |
| 1185 | asection *sec; |
| 1186 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 1187 | Elf_Internal_Rela *rel; |
| 1188 | struct elf_link_hash_entry *h; |
| 1189 | Elf_Internal_Sym *sym; |
| 1190 | { |
| 1191 | if (h != NULL) |
| 1192 | { |
| 1193 | switch (ELF32_R_TYPE (rel->r_info)) |
| 1194 | { |
| 1195 | case R_386_GNU_VTINHERIT: |
| 1196 | case R_386_GNU_VTENTRY: |
| 1197 | break; |
| 1198 | |
| 1199 | default: |
| 1200 | switch (h->root.type) |
| 1201 | { |
| 1202 | case bfd_link_hash_defined: |
| 1203 | case bfd_link_hash_defweak: |
| 1204 | return h->root.u.def.section; |
| 1205 | |
| 1206 | case bfd_link_hash_common: |
| 1207 | return h->root.u.c.p->section; |
| 1208 | |
| 1209 | default: |
| 1210 | break; |
| 1211 | } |
| 1212 | } |
| 1213 | } |
| 1214 | else |
| 1215 | return bfd_section_from_elf_index (sec->owner, sym->st_shndx); |
| 1216 | |
| 1217 | return NULL; |
| 1218 | } |
| 1219 | |
| 1220 | /* Update the got entry reference counts for the section being removed. */ |
| 1221 | |
| 1222 | static boolean |
| 1223 | elf_i386_gc_sweep_hook (abfd, info, sec, relocs) |
| 1224 | bfd *abfd; |
| 1225 | struct bfd_link_info *info; |
| 1226 | asection *sec; |
| 1227 | const Elf_Internal_Rela *relocs; |
| 1228 | { |
| 1229 | Elf_Internal_Shdr *symtab_hdr; |
| 1230 | struct elf_link_hash_entry **sym_hashes; |
| 1231 | bfd_signed_vma *local_got_refcounts; |
| 1232 | const Elf_Internal_Rela *rel, *relend; |
| 1233 | unsigned long r_symndx; |
| 1234 | struct elf_link_hash_entry *h; |
| 1235 | |
| 1236 | elf_section_data (sec)->local_dynrel = NULL; |
| 1237 | |
| 1238 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1239 | sym_hashes = elf_sym_hashes (abfd); |
| 1240 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 1241 | |
| 1242 | relend = relocs + sec->reloc_count; |
| 1243 | for (rel = relocs; rel < relend; rel++) |
| 1244 | switch (elf_i386_tls_transition (info, ELF32_R_TYPE (rel->r_info), |
| 1245 | ELF32_R_SYM (rel->r_info) |
| 1246 | >= symtab_hdr->sh_info)) |
| 1247 | { |
| 1248 | case R_386_TLS_LDM: |
| 1249 | if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0) |
| 1250 | elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1; |
| 1251 | break; |
| 1252 | |
| 1253 | case R_386_TLS_GD: |
| 1254 | case R_386_TLS_IE_32: |
| 1255 | case R_386_GOT32: |
| 1256 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1257 | if (r_symndx >= symtab_hdr->sh_info) |
| 1258 | { |
| 1259 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1260 | if (h->got.refcount > 0) |
| 1261 | h->got.refcount -= 1; |
| 1262 | } |
| 1263 | else if (local_got_refcounts != NULL) |
| 1264 | { |
| 1265 | if (local_got_refcounts[r_symndx] > 0) |
| 1266 | local_got_refcounts[r_symndx] -= 1; |
| 1267 | } |
| 1268 | break; |
| 1269 | |
| 1270 | case R_386_32: |
| 1271 | case R_386_PC32: |
| 1272 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1273 | if (r_symndx >= symtab_hdr->sh_info) |
| 1274 | { |
| 1275 | struct elf_i386_link_hash_entry *eh; |
| 1276 | struct elf_i386_dyn_relocs **pp; |
| 1277 | struct elf_i386_dyn_relocs *p; |
| 1278 | |
| 1279 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1280 | |
| 1281 | if (!info->shared && h->plt.refcount > 0) |
| 1282 | h->plt.refcount -= 1; |
| 1283 | |
| 1284 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1285 | |
| 1286 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) |
| 1287 | if (p->sec == sec) |
| 1288 | { |
| 1289 | if (ELF32_R_TYPE (rel->r_info) == R_386_PC32) |
| 1290 | p->pc_count -= 1; |
| 1291 | p->count -= 1; |
| 1292 | if (p->count == 0) |
| 1293 | *pp = p->next; |
| 1294 | break; |
| 1295 | } |
| 1296 | } |
| 1297 | break; |
| 1298 | |
| 1299 | case R_386_PLT32: |
| 1300 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1301 | if (r_symndx >= symtab_hdr->sh_info) |
| 1302 | { |
| 1303 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1304 | if (h->plt.refcount > 0) |
| 1305 | h->plt.refcount -= 1; |
| 1306 | } |
| 1307 | break; |
| 1308 | |
| 1309 | default: |
| 1310 | break; |
| 1311 | } |
| 1312 | |
| 1313 | return true; |
| 1314 | } |
| 1315 | |
| 1316 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 1317 | regular object. The current definition is in some section of the |
| 1318 | dynamic object, but we're not including those sections. We have to |
| 1319 | change the definition to something the rest of the link can |
| 1320 | understand. */ |
| 1321 | |
| 1322 | static boolean |
| 1323 | elf_i386_adjust_dynamic_symbol (info, h) |
| 1324 | struct bfd_link_info *info; |
| 1325 | struct elf_link_hash_entry *h; |
| 1326 | { |
| 1327 | struct elf_i386_link_hash_table *htab; |
| 1328 | struct elf_i386_link_hash_entry * eh; |
| 1329 | struct elf_i386_dyn_relocs *p; |
| 1330 | asection *s; |
| 1331 | unsigned int power_of_two; |
| 1332 | |
| 1333 | /* If this is a function, put it in the procedure linkage table. We |
| 1334 | will fill in the contents of the procedure linkage table later, |
| 1335 | when we know the address of the .got section. */ |
| 1336 | if (h->type == STT_FUNC |
| 1337 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) |
| 1338 | { |
| 1339 | if (h->plt.refcount <= 0 |
| 1340 | || (! info->shared |
| 1341 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 |
| 1342 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0 |
| 1343 | && h->root.type != bfd_link_hash_undefweak |
| 1344 | && h->root.type != bfd_link_hash_undefined)) |
| 1345 | { |
| 1346 | /* This case can occur if we saw a PLT32 reloc in an input |
| 1347 | file, but the symbol was never referred to by a dynamic |
| 1348 | object, or if all references were garbage collected. In |
| 1349 | such a case, we don't actually need to build a procedure |
| 1350 | linkage table, and we can just do a PC32 reloc instead. */ |
| 1351 | h->plt.offset = (bfd_vma) -1; |
| 1352 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 1353 | } |
| 1354 | |
| 1355 | return true; |
| 1356 | } |
| 1357 | else |
| 1358 | /* It's possible that we incorrectly decided a .plt reloc was |
| 1359 | needed for an R_386_PC32 reloc to a non-function sym in |
| 1360 | check_relocs. We can't decide accurately between function and |
| 1361 | non-function syms in check-relocs; Objects loaded later in |
| 1362 | the link may change h->type. So fix it now. */ |
| 1363 | h->plt.offset = (bfd_vma) -1; |
| 1364 | |
| 1365 | /* If this is a weak symbol, and there is a real definition, the |
| 1366 | processor independent code will have arranged for us to see the |
| 1367 | real definition first, and we can just use the same value. */ |
| 1368 | if (h->weakdef != NULL) |
| 1369 | { |
| 1370 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined |
| 1371 | || h->weakdef->root.type == bfd_link_hash_defweak); |
| 1372 | h->root.u.def.section = h->weakdef->root.u.def.section; |
| 1373 | h->root.u.def.value = h->weakdef->root.u.def.value; |
| 1374 | return true; |
| 1375 | } |
| 1376 | |
| 1377 | /* This is a reference to a symbol defined by a dynamic object which |
| 1378 | is not a function. */ |
| 1379 | |
| 1380 | /* If we are creating a shared library, we must presume that the |
| 1381 | only references to the symbol are via the global offset table. |
| 1382 | For such cases we need not do anything here; the relocations will |
| 1383 | be handled correctly by relocate_section. */ |
| 1384 | if (info->shared) |
| 1385 | return true; |
| 1386 | |
| 1387 | /* If there are no references to this symbol that do not use the |
| 1388 | GOT, we don't need to generate a copy reloc. */ |
| 1389 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) |
| 1390 | return true; |
| 1391 | |
| 1392 | /* If -z nocopyreloc was given, we won't generate them either. */ |
| 1393 | if (info->nocopyreloc) |
| 1394 | { |
| 1395 | h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; |
| 1396 | return true; |
| 1397 | } |
| 1398 | |
| 1399 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1400 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1401 | { |
| 1402 | s = p->sec->output_section; |
| 1403 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 1404 | break; |
| 1405 | } |
| 1406 | |
| 1407 | /* If we didn't find any dynamic relocs in read-only sections, then |
| 1408 | we'll be keeping the dynamic relocs and avoiding the copy reloc. */ |
| 1409 | if (p == NULL) |
| 1410 | { |
| 1411 | h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; |
| 1412 | return true; |
| 1413 | } |
| 1414 | |
| 1415 | /* We must allocate the symbol in our .dynbss section, which will |
| 1416 | become part of the .bss section of the executable. There will be |
| 1417 | an entry for this symbol in the .dynsym section. The dynamic |
| 1418 | object will contain position independent code, so all references |
| 1419 | from the dynamic object to this symbol will go through the global |
| 1420 | offset table. The dynamic linker will use the .dynsym entry to |
| 1421 | determine the address it must put in the global offset table, so |
| 1422 | both the dynamic object and the regular object will refer to the |
| 1423 | same memory location for the variable. */ |
| 1424 | |
| 1425 | htab = elf_i386_hash_table (info); |
| 1426 | |
| 1427 | /* We must generate a R_386_COPY reloc to tell the dynamic linker to |
| 1428 | copy the initial value out of the dynamic object and into the |
| 1429 | runtime process image. */ |
| 1430 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| 1431 | { |
| 1432 | htab->srelbss->_raw_size += sizeof (Elf32_External_Rel); |
| 1433 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; |
| 1434 | } |
| 1435 | |
| 1436 | /* We need to figure out the alignment required for this symbol. I |
| 1437 | have no idea how ELF linkers handle this. */ |
| 1438 | power_of_two = bfd_log2 (h->size); |
| 1439 | if (power_of_two > 3) |
| 1440 | power_of_two = 3; |
| 1441 | |
| 1442 | /* Apply the required alignment. */ |
| 1443 | s = htab->sdynbss; |
| 1444 | s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two)); |
| 1445 | if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) |
| 1446 | { |
| 1447 | if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two)) |
| 1448 | return false; |
| 1449 | } |
| 1450 | |
| 1451 | /* Define the symbol as being at this point in the section. */ |
| 1452 | h->root.u.def.section = s; |
| 1453 | h->root.u.def.value = s->_raw_size; |
| 1454 | |
| 1455 | /* Increment the section size to make room for the symbol. */ |
| 1456 | s->_raw_size += h->size; |
| 1457 | |
| 1458 | return true; |
| 1459 | } |
| 1460 | |
| 1461 | /* This is the condition under which elf_i386_finish_dynamic_symbol |
| 1462 | will be called from elflink.h. If elflink.h doesn't call our |
| 1463 | finish_dynamic_symbol routine, we'll need to do something about |
| 1464 | initializing any .plt and .got entries in elf_i386_relocate_section. */ |
| 1465 | #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \ |
| 1466 | ((DYN) \ |
| 1467 | && ((INFO)->shared \ |
| 1468 | || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \ |
| 1469 | && ((H)->dynindx != -1 \ |
| 1470 | || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)) |
| 1471 | |
| 1472 | /* Allocate space in .plt, .got and associated reloc sections for |
| 1473 | dynamic relocs. */ |
| 1474 | |
| 1475 | static boolean |
| 1476 | allocate_dynrelocs (h, inf) |
| 1477 | struct elf_link_hash_entry *h; |
| 1478 | PTR inf; |
| 1479 | { |
| 1480 | struct bfd_link_info *info; |
| 1481 | struct elf_i386_link_hash_table *htab; |
| 1482 | struct elf_i386_link_hash_entry *eh; |
| 1483 | struct elf_i386_dyn_relocs *p; |
| 1484 | |
| 1485 | if (h->root.type == bfd_link_hash_indirect) |
| 1486 | return true; |
| 1487 | |
| 1488 | if (h->root.type == bfd_link_hash_warning) |
| 1489 | /* When warning symbols are created, they **replace** the "real" |
| 1490 | entry in the hash table, thus we never get to see the real |
| 1491 | symbol in a hash traversal. So look at it now. */ |
| 1492 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1493 | |
| 1494 | info = (struct bfd_link_info *) inf; |
| 1495 | htab = elf_i386_hash_table (info); |
| 1496 | |
| 1497 | if (htab->elf.dynamic_sections_created |
| 1498 | && h->plt.refcount > 0) |
| 1499 | { |
| 1500 | /* Make sure this symbol is output as a dynamic symbol. |
| 1501 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1502 | if (h->dynindx == -1 |
| 1503 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| 1504 | { |
| 1505 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) |
| 1506 | return false; |
| 1507 | } |
| 1508 | |
| 1509 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h)) |
| 1510 | { |
| 1511 | asection *s = htab->splt; |
| 1512 | |
| 1513 | /* If this is the first .plt entry, make room for the special |
| 1514 | first entry. */ |
| 1515 | if (s->_raw_size == 0) |
| 1516 | s->_raw_size += PLT_ENTRY_SIZE; |
| 1517 | |
| 1518 | h->plt.offset = s->_raw_size; |
| 1519 | |
| 1520 | /* If this symbol is not defined in a regular file, and we are |
| 1521 | not generating a shared library, then set the symbol to this |
| 1522 | location in the .plt. This is required to make function |
| 1523 | pointers compare as equal between the normal executable and |
| 1524 | the shared library. */ |
| 1525 | if (! info->shared |
| 1526 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1527 | { |
| 1528 | h->root.u.def.section = s; |
| 1529 | h->root.u.def.value = h->plt.offset; |
| 1530 | } |
| 1531 | |
| 1532 | /* Make room for this entry. */ |
| 1533 | s->_raw_size += PLT_ENTRY_SIZE; |
| 1534 | |
| 1535 | /* We also need to make an entry in the .got.plt section, which |
| 1536 | will be placed in the .got section by the linker script. */ |
| 1537 | htab->sgotplt->_raw_size += 4; |
| 1538 | |
| 1539 | /* We also need to make an entry in the .rel.plt section. */ |
| 1540 | htab->srelplt->_raw_size += sizeof (Elf32_External_Rel); |
| 1541 | } |
| 1542 | else |
| 1543 | { |
| 1544 | h->plt.offset = (bfd_vma) -1; |
| 1545 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 1546 | } |
| 1547 | } |
| 1548 | else |
| 1549 | { |
| 1550 | h->plt.offset = (bfd_vma) -1; |
| 1551 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 1552 | } |
| 1553 | |
| 1554 | /* If R_386_TLS_IE_32 symbol is now local to the binary, |
| 1555 | make it a R_386_TLS_LE_32 requiring no TLS entry. */ |
| 1556 | if (h->got.refcount > 0 |
| 1557 | && !info->shared |
| 1558 | && h->dynindx == -1 |
| 1559 | && elf_i386_hash_entry(h)->tls_type == GOT_TLS_IE) |
| 1560 | h->got.offset = (bfd_vma) -1; |
| 1561 | else if (h->got.refcount > 0) |
| 1562 | { |
| 1563 | asection *s; |
| 1564 | boolean dyn; |
| 1565 | int tls_type = elf_i386_hash_entry(h)->tls_type; |
| 1566 | |
| 1567 | /* Make sure this symbol is output as a dynamic symbol. |
| 1568 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1569 | if (h->dynindx == -1 |
| 1570 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| 1571 | { |
| 1572 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) |
| 1573 | return false; |
| 1574 | } |
| 1575 | |
| 1576 | s = htab->sgot; |
| 1577 | h->got.offset = s->_raw_size; |
| 1578 | s->_raw_size += 4; |
| 1579 | /* R_386_TLS_GD needs 2 consecutive GOT slots. */ |
| 1580 | if (tls_type == GOT_TLS_GD) |
| 1581 | s->_raw_size += 4; |
| 1582 | dyn = htab->elf.dynamic_sections_created; |
| 1583 | /* R_386_TLS_IE_32 needs one dynamic relocation, |
| 1584 | R_386_TLS_GD needs one if local symbol and two if global. */ |
| 1585 | if ((tls_type == GOT_TLS_GD && h->dynindx == -1) |
| 1586 | || tls_type == GOT_TLS_IE) |
| 1587 | htab->srelgot->_raw_size += sizeof (Elf32_External_Rel); |
| 1588 | else if (tls_type == GOT_TLS_GD) |
| 1589 | htab->srelgot->_raw_size += 2 * sizeof (Elf32_External_Rel); |
| 1590 | else if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)) |
| 1591 | htab->srelgot->_raw_size += sizeof (Elf32_External_Rel); |
| 1592 | } |
| 1593 | else |
| 1594 | h->got.offset = (bfd_vma) -1; |
| 1595 | |
| 1596 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1597 | if (eh->dyn_relocs == NULL) |
| 1598 | return true; |
| 1599 | |
| 1600 | /* In the shared -Bsymbolic case, discard space allocated for |
| 1601 | dynamic pc-relative relocs against symbols which turn out to be |
| 1602 | defined in regular objects. For the normal shared case, discard |
| 1603 | space for pc-relative relocs that have become local due to symbol |
| 1604 | visibility changes. */ |
| 1605 | |
| 1606 | if (info->shared) |
| 1607 | { |
| 1608 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 |
| 1609 | && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 |
| 1610 | || info->symbolic)) |
| 1611 | { |
| 1612 | struct elf_i386_dyn_relocs **pp; |
| 1613 | |
| 1614 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) |
| 1615 | { |
| 1616 | p->count -= p->pc_count; |
| 1617 | p->pc_count = 0; |
| 1618 | if (p->count == 0) |
| 1619 | *pp = p->next; |
| 1620 | else |
| 1621 | pp = &p->next; |
| 1622 | } |
| 1623 | } |
| 1624 | } |
| 1625 | else |
| 1626 | { |
| 1627 | /* For the non-shared case, discard space for relocs against |
| 1628 | symbols which turn out to need copy relocs or are not |
| 1629 | dynamic. */ |
| 1630 | |
| 1631 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 |
| 1632 | && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
| 1633 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1634 | || (htab->elf.dynamic_sections_created |
| 1635 | && (h->root.type == bfd_link_hash_undefweak |
| 1636 | || h->root.type == bfd_link_hash_undefined)))) |
| 1637 | { |
| 1638 | /* Make sure this symbol is output as a dynamic symbol. |
| 1639 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1640 | if (h->dynindx == -1 |
| 1641 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| 1642 | { |
| 1643 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) |
| 1644 | return false; |
| 1645 | } |
| 1646 | |
| 1647 | /* If that succeeded, we know we'll be keeping all the |
| 1648 | relocs. */ |
| 1649 | if (h->dynindx != -1) |
| 1650 | goto keep; |
| 1651 | } |
| 1652 | |
| 1653 | eh->dyn_relocs = NULL; |
| 1654 | |
| 1655 | keep: ; |
| 1656 | } |
| 1657 | |
| 1658 | /* Finally, allocate space. */ |
| 1659 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1660 | { |
| 1661 | asection *sreloc = elf_section_data (p->sec)->sreloc; |
| 1662 | sreloc->_raw_size += p->count * sizeof (Elf32_External_Rel); |
| 1663 | } |
| 1664 | |
| 1665 | return true; |
| 1666 | } |
| 1667 | |
| 1668 | /* Find any dynamic relocs that apply to read-only sections. */ |
| 1669 | |
| 1670 | static boolean |
| 1671 | readonly_dynrelocs (h, inf) |
| 1672 | struct elf_link_hash_entry *h; |
| 1673 | PTR inf; |
| 1674 | { |
| 1675 | struct elf_i386_link_hash_entry *eh; |
| 1676 | struct elf_i386_dyn_relocs *p; |
| 1677 | |
| 1678 | if (h->root.type == bfd_link_hash_warning) |
| 1679 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1680 | |
| 1681 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1682 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1683 | { |
| 1684 | asection *s = p->sec->output_section; |
| 1685 | |
| 1686 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 1687 | { |
| 1688 | struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| 1689 | |
| 1690 | info->flags |= DF_TEXTREL; |
| 1691 | |
| 1692 | /* Not an error, just cut short the traversal. */ |
| 1693 | return false; |
| 1694 | } |
| 1695 | } |
| 1696 | return true; |
| 1697 | } |
| 1698 | |
| 1699 | /* Set the sizes of the dynamic sections. */ |
| 1700 | |
| 1701 | static boolean |
| 1702 | elf_i386_size_dynamic_sections (output_bfd, info) |
| 1703 | bfd *output_bfd ATTRIBUTE_UNUSED; |
| 1704 | struct bfd_link_info *info; |
| 1705 | { |
| 1706 | struct elf_i386_link_hash_table *htab; |
| 1707 | bfd *dynobj; |
| 1708 | asection *s; |
| 1709 | boolean relocs; |
| 1710 | bfd *ibfd; |
| 1711 | |
| 1712 | htab = elf_i386_hash_table (info); |
| 1713 | dynobj = htab->elf.dynobj; |
| 1714 | if (dynobj == NULL) |
| 1715 | abort (); |
| 1716 | |
| 1717 | if (htab->elf.dynamic_sections_created) |
| 1718 | { |
| 1719 | /* Set the contents of the .interp section to the interpreter. */ |
| 1720 | if (! info->shared) |
| 1721 | { |
| 1722 | s = bfd_get_section_by_name (dynobj, ".interp"); |
| 1723 | if (s == NULL) |
| 1724 | abort (); |
| 1725 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; |
| 1726 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| 1727 | } |
| 1728 | } |
| 1729 | |
| 1730 | /* Set up .got offsets for local syms, and space for local dynamic |
| 1731 | relocs. */ |
| 1732 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) |
| 1733 | { |
| 1734 | bfd_signed_vma *local_got; |
| 1735 | bfd_signed_vma *end_local_got; |
| 1736 | char *local_tls_type; |
| 1737 | bfd_size_type locsymcount; |
| 1738 | Elf_Internal_Shdr *symtab_hdr; |
| 1739 | asection *srel; |
| 1740 | |
| 1741 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) |
| 1742 | continue; |
| 1743 | |
| 1744 | for (s = ibfd->sections; s != NULL; s = s->next) |
| 1745 | { |
| 1746 | struct elf_i386_dyn_relocs *p; |
| 1747 | |
| 1748 | for (p = *((struct elf_i386_dyn_relocs **) |
| 1749 | &elf_section_data (s)->local_dynrel); |
| 1750 | p != NULL; |
| 1751 | p = p->next) |
| 1752 | { |
| 1753 | if (!bfd_is_abs_section (p->sec) |
| 1754 | && bfd_is_abs_section (p->sec->output_section)) |
| 1755 | { |
| 1756 | /* Input section has been discarded, either because |
| 1757 | it is a copy of a linkonce section or due to |
| 1758 | linker script /DISCARD/, so we'll be discarding |
| 1759 | the relocs too. */ |
| 1760 | } |
| 1761 | else if (p->count != 0) |
| 1762 | { |
| 1763 | srel = elf_section_data (p->sec)->sreloc; |
| 1764 | srel->_raw_size += p->count * sizeof (Elf32_External_Rel); |
| 1765 | if ((p->sec->output_section->flags & SEC_READONLY) != 0) |
| 1766 | info->flags |= DF_TEXTREL; |
| 1767 | } |
| 1768 | } |
| 1769 | } |
| 1770 | |
| 1771 | local_got = elf_local_got_refcounts (ibfd); |
| 1772 | if (!local_got) |
| 1773 | continue; |
| 1774 | |
| 1775 | symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; |
| 1776 | locsymcount = symtab_hdr->sh_info; |
| 1777 | end_local_got = local_got + locsymcount; |
| 1778 | local_tls_type = elf_i386_local_got_tls_type (ibfd); |
| 1779 | s = htab->sgot; |
| 1780 | srel = htab->srelgot; |
| 1781 | for (; local_got < end_local_got; ++local_got, ++local_tls_type) |
| 1782 | { |
| 1783 | if (*local_got > 0) |
| 1784 | { |
| 1785 | *local_got = s->_raw_size; |
| 1786 | s->_raw_size += 4; |
| 1787 | if (*local_tls_type == GOT_TLS_GD) |
| 1788 | s->_raw_size += 4; |
| 1789 | if (info->shared |
| 1790 | || *local_tls_type == GOT_TLS_GD |
| 1791 | || *local_tls_type == GOT_TLS_IE) |
| 1792 | srel->_raw_size += sizeof (Elf32_External_Rel); |
| 1793 | } |
| 1794 | else |
| 1795 | *local_got = (bfd_vma) -1; |
| 1796 | } |
| 1797 | } |
| 1798 | |
| 1799 | if (htab->tls_ldm_got.refcount > 0) |
| 1800 | { |
| 1801 | /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM |
| 1802 | relocs. */ |
| 1803 | htab->tls_ldm_got.offset = htab->sgot->_raw_size; |
| 1804 | htab->sgot->_raw_size += 8; |
| 1805 | htab->srelgot->_raw_size += sizeof (Elf32_External_Rel); |
| 1806 | } |
| 1807 | else |
| 1808 | htab->tls_ldm_got.offset = -1; |
| 1809 | |
| 1810 | /* Allocate global sym .plt and .got entries, and space for global |
| 1811 | sym dynamic relocs. */ |
| 1812 | elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); |
| 1813 | |
| 1814 | /* We now have determined the sizes of the various dynamic sections. |
| 1815 | Allocate memory for them. */ |
| 1816 | relocs = false; |
| 1817 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 1818 | { |
| 1819 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 1820 | continue; |
| 1821 | |
| 1822 | if (s == htab->splt |
| 1823 | || s == htab->sgot |
| 1824 | || s == htab->sgotplt) |
| 1825 | { |
| 1826 | /* Strip this section if we don't need it; see the |
| 1827 | comment below. */ |
| 1828 | } |
| 1829 | else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0) |
| 1830 | { |
| 1831 | if (s->_raw_size != 0 && s != htab->srelplt) |
| 1832 | relocs = true; |
| 1833 | |
| 1834 | /* We use the reloc_count field as a counter if we need |
| 1835 | to copy relocs into the output file. */ |
| 1836 | s->reloc_count = 0; |
| 1837 | } |
| 1838 | else |
| 1839 | { |
| 1840 | /* It's not one of our sections, so don't allocate space. */ |
| 1841 | continue; |
| 1842 | } |
| 1843 | |
| 1844 | if (s->_raw_size == 0) |
| 1845 | { |
| 1846 | /* If we don't need this section, strip it from the |
| 1847 | output file. This is mostly to handle .rel.bss and |
| 1848 | .rel.plt. We must create both sections in |
| 1849 | create_dynamic_sections, because they must be created |
| 1850 | before the linker maps input sections to output |
| 1851 | sections. The linker does that before |
| 1852 | adjust_dynamic_symbol is called, and it is that |
| 1853 | function which decides whether anything needs to go |
| 1854 | into these sections. */ |
| 1855 | |
| 1856 | _bfd_strip_section_from_output (info, s); |
| 1857 | continue; |
| 1858 | } |
| 1859 | |
| 1860 | /* Allocate memory for the section contents. We use bfd_zalloc |
| 1861 | here in case unused entries are not reclaimed before the |
| 1862 | section's contents are written out. This should not happen, |
| 1863 | but this way if it does, we get a R_386_NONE reloc instead |
| 1864 | of garbage. */ |
| 1865 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); |
| 1866 | if (s->contents == NULL) |
| 1867 | return false; |
| 1868 | } |
| 1869 | |
| 1870 | if (htab->elf.dynamic_sections_created) |
| 1871 | { |
| 1872 | /* Add some entries to the .dynamic section. We fill in the |
| 1873 | values later, in elf_i386_finish_dynamic_sections, but we |
| 1874 | must add the entries now so that we get the correct size for |
| 1875 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 1876 | dynamic linker and used by the debugger. */ |
| 1877 | #define add_dynamic_entry(TAG, VAL) \ |
| 1878 | bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL)) |
| 1879 | |
| 1880 | if (! info->shared) |
| 1881 | { |
| 1882 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
| 1883 | return false; |
| 1884 | } |
| 1885 | |
| 1886 | if (htab->splt->_raw_size != 0) |
| 1887 | { |
| 1888 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
| 1889 | || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| 1890 | || !add_dynamic_entry (DT_PLTREL, DT_REL) |
| 1891 | || !add_dynamic_entry (DT_JMPREL, 0)) |
| 1892 | return false; |
| 1893 | } |
| 1894 | |
| 1895 | if (relocs) |
| 1896 | { |
| 1897 | if (!add_dynamic_entry (DT_REL, 0) |
| 1898 | || !add_dynamic_entry (DT_RELSZ, 0) |
| 1899 | || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel))) |
| 1900 | return false; |
| 1901 | |
| 1902 | /* If any dynamic relocs apply to a read-only section, |
| 1903 | then we need a DT_TEXTREL entry. */ |
| 1904 | if ((info->flags & DF_TEXTREL) == 0) |
| 1905 | elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, |
| 1906 | (PTR) info); |
| 1907 | |
| 1908 | if ((info->flags & DF_TEXTREL) != 0) |
| 1909 | { |
| 1910 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| 1911 | return false; |
| 1912 | } |
| 1913 | } |
| 1914 | } |
| 1915 | #undef add_dynamic_entry |
| 1916 | |
| 1917 | return true; |
| 1918 | } |
| 1919 | |
| 1920 | /* Set the correct type for an x86 ELF section. We do this by the |
| 1921 | section name, which is a hack, but ought to work. */ |
| 1922 | |
| 1923 | static boolean |
| 1924 | elf_i386_fake_sections (abfd, hdr, sec) |
| 1925 | bfd *abfd ATTRIBUTE_UNUSED; |
| 1926 | Elf32_Internal_Shdr *hdr; |
| 1927 | asection *sec; |
| 1928 | { |
| 1929 | register const char *name; |
| 1930 | |
| 1931 | name = bfd_get_section_name (abfd, sec); |
| 1932 | |
| 1933 | /* This is an ugly, but unfortunately necessary hack that is |
| 1934 | needed when producing EFI binaries on x86. It tells |
| 1935 | elf.c:elf_fake_sections() not to consider ".reloc" as a section |
| 1936 | containing ELF relocation info. We need this hack in order to |
| 1937 | be able to generate ELF binaries that can be translated into |
| 1938 | EFI applications (which are essentially COFF objects). Those |
| 1939 | files contain a COFF ".reloc" section inside an ELFNN object, |
| 1940 | which would normally cause BFD to segfault because it would |
| 1941 | attempt to interpret this section as containing relocation |
| 1942 | entries for section "oc". With this hack enabled, ".reloc" |
| 1943 | will be treated as a normal data section, which will avoid the |
| 1944 | segfault. However, you won't be able to create an ELFNN binary |
| 1945 | with a section named "oc" that needs relocations, but that's |
| 1946 | the kind of ugly side-effects you get when detecting section |
| 1947 | types based on their names... In practice, this limitation is |
| 1948 | unlikely to bite. */ |
| 1949 | if (strcmp (name, ".reloc") == 0) |
| 1950 | hdr->sh_type = SHT_PROGBITS; |
| 1951 | |
| 1952 | return true; |
| 1953 | } |
| 1954 | |
| 1955 | /* Return the base VMA address which should be subtracted from real addresses |
| 1956 | when resolving @dtpoff relocation. |
| 1957 | This is PT_TLS segment p_vaddr. */ |
| 1958 | |
| 1959 | static bfd_vma |
| 1960 | dtpoff_base (info) |
| 1961 | struct bfd_link_info *info; |
| 1962 | { |
| 1963 | BFD_ASSERT (elf_hash_table (info)->tls_segment != NULL); |
| 1964 | return elf_hash_table (info)->tls_segment->start; |
| 1965 | } |
| 1966 | |
| 1967 | /* Return the relocation value for @tpoff relocation |
| 1968 | if STT_TLS virtual address is ADDRESS. */ |
| 1969 | |
| 1970 | static bfd_vma |
| 1971 | tpoff (info, address) |
| 1972 | struct bfd_link_info *info; |
| 1973 | bfd_vma address; |
| 1974 | { |
| 1975 | struct elf_link_tls_segment *tls_segment |
| 1976 | = elf_hash_table (info)->tls_segment; |
| 1977 | |
| 1978 | BFD_ASSERT (tls_segment != NULL); |
| 1979 | return (align_power (tls_segment->size, tls_segment->align) |
| 1980 | + tls_segment->start - address); |
| 1981 | } |
| 1982 | |
| 1983 | /* Relocate an i386 ELF section. */ |
| 1984 | |
| 1985 | static boolean |
| 1986 | elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, |
| 1987 | contents, relocs, local_syms, local_sections) |
| 1988 | bfd *output_bfd; |
| 1989 | struct bfd_link_info *info; |
| 1990 | bfd *input_bfd; |
| 1991 | asection *input_section; |
| 1992 | bfd_byte *contents; |
| 1993 | Elf_Internal_Rela *relocs; |
| 1994 | Elf_Internal_Sym *local_syms; |
| 1995 | asection **local_sections; |
| 1996 | { |
| 1997 | struct elf_i386_link_hash_table *htab; |
| 1998 | Elf_Internal_Shdr *symtab_hdr; |
| 1999 | struct elf_link_hash_entry **sym_hashes; |
| 2000 | bfd_vma *local_got_offsets; |
| 2001 | Elf_Internal_Rela *rel; |
| 2002 | Elf_Internal_Rela *relend; |
| 2003 | |
| 2004 | htab = elf_i386_hash_table (info); |
| 2005 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 2006 | sym_hashes = elf_sym_hashes (input_bfd); |
| 2007 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 2008 | |
| 2009 | rel = relocs; |
| 2010 | relend = relocs + input_section->reloc_count; |
| 2011 | for (; rel < relend; rel++) |
| 2012 | { |
| 2013 | unsigned int r_type; |
| 2014 | reloc_howto_type *howto; |
| 2015 | unsigned long r_symndx; |
| 2016 | struct elf_link_hash_entry *h; |
| 2017 | Elf_Internal_Sym *sym; |
| 2018 | asection *sec; |
| 2019 | bfd_vma off; |
| 2020 | bfd_vma relocation; |
| 2021 | boolean unresolved_reloc; |
| 2022 | bfd_reloc_status_type r; |
| 2023 | unsigned int indx; |
| 2024 | int tls_type; |
| 2025 | |
| 2026 | r_type = ELF32_R_TYPE (rel->r_info); |
| 2027 | if (r_type == (int) R_386_GNU_VTINHERIT |
| 2028 | || r_type == (int) R_386_GNU_VTENTRY) |
| 2029 | continue; |
| 2030 | |
| 2031 | if ((indx = (unsigned) r_type) >= R_386_standard |
| 2032 | && ((indx = r_type - R_386_ext_offset) - R_386_standard |
| 2033 | >= R_386_ext - R_386_standard) |
| 2034 | && ((indx = r_type - R_386_tls_offset) - R_386_ext |
| 2035 | >= R_386_tls - R_386_ext)) |
| 2036 | { |
| 2037 | bfd_set_error (bfd_error_bad_value); |
| 2038 | return false; |
| 2039 | } |
| 2040 | howto = elf_howto_table + indx; |
| 2041 | |
| 2042 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 2043 | |
| 2044 | if (info->relocateable) |
| 2045 | { |
| 2046 | bfd_vma val; |
| 2047 | bfd_byte *where; |
| 2048 | |
| 2049 | /* This is a relocatable link. We don't have to change |
| 2050 | anything, unless the reloc is against a section symbol, |
| 2051 | in which case we have to adjust according to where the |
| 2052 | section symbol winds up in the output section. */ |
| 2053 | if (r_symndx >= symtab_hdr->sh_info) |
| 2054 | continue; |
| 2055 | |
| 2056 | sym = local_syms + r_symndx; |
| 2057 | if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) |
| 2058 | continue; |
| 2059 | |
| 2060 | sec = local_sections[r_symndx]; |
| 2061 | val = sec->output_offset; |
| 2062 | if (val == 0) |
| 2063 | continue; |
| 2064 | |
| 2065 | where = contents + rel->r_offset; |
| 2066 | switch (howto->size) |
| 2067 | { |
| 2068 | /* FIXME: overflow checks. */ |
| 2069 | case 0: |
| 2070 | val += bfd_get_8 (input_bfd, where); |
| 2071 | bfd_put_8 (input_bfd, val, where); |
| 2072 | break; |
| 2073 | case 1: |
| 2074 | val += bfd_get_16 (input_bfd, where); |
| 2075 | bfd_put_16 (input_bfd, val, where); |
| 2076 | break; |
| 2077 | case 2: |
| 2078 | val += bfd_get_32 (input_bfd, where); |
| 2079 | bfd_put_32 (input_bfd, val, where); |
| 2080 | break; |
| 2081 | default: |
| 2082 | abort (); |
| 2083 | } |
| 2084 | continue; |
| 2085 | } |
| 2086 | |
| 2087 | /* This is a final link. */ |
| 2088 | h = NULL; |
| 2089 | sym = NULL; |
| 2090 | sec = NULL; |
| 2091 | unresolved_reloc = false; |
| 2092 | if (r_symndx < symtab_hdr->sh_info) |
| 2093 | { |
| 2094 | sym = local_syms + r_symndx; |
| 2095 | sec = local_sections[r_symndx]; |
| 2096 | relocation = (sec->output_section->vma |
| 2097 | + sec->output_offset |
| 2098 | + sym->st_value); |
| 2099 | if ((sec->flags & SEC_MERGE) |
| 2100 | && ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 2101 | { |
| 2102 | asection *msec; |
| 2103 | bfd_vma addend; |
| 2104 | bfd_byte *where = contents + rel->r_offset; |
| 2105 | |
| 2106 | switch (howto->size) |
| 2107 | { |
| 2108 | case 0: |
| 2109 | addend = bfd_get_8 (input_bfd, where); |
| 2110 | if (howto->pc_relative) |
| 2111 | { |
| 2112 | addend = (addend ^ 0x80) - 0x80; |
| 2113 | addend += 1; |
| 2114 | } |
| 2115 | break; |
| 2116 | case 1: |
| 2117 | addend = bfd_get_16 (input_bfd, where); |
| 2118 | if (howto->pc_relative) |
| 2119 | { |
| 2120 | addend = (addend ^ 0x8000) - 0x8000; |
| 2121 | addend += 2; |
| 2122 | } |
| 2123 | break; |
| 2124 | case 2: |
| 2125 | addend = bfd_get_32 (input_bfd, where); |
| 2126 | if (howto->pc_relative) |
| 2127 | { |
| 2128 | addend = (addend ^ 0x80000000) - 0x80000000; |
| 2129 | addend += 4; |
| 2130 | } |
| 2131 | break; |
| 2132 | default: |
| 2133 | abort (); |
| 2134 | } |
| 2135 | |
| 2136 | msec = sec; |
| 2137 | addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend); |
| 2138 | addend -= relocation; |
| 2139 | addend += msec->output_section->vma + msec->output_offset; |
| 2140 | |
| 2141 | switch (howto->size) |
| 2142 | { |
| 2143 | case 0: |
| 2144 | /* FIXME: overflow checks. */ |
| 2145 | if (howto->pc_relative) |
| 2146 | addend -= 1; |
| 2147 | bfd_put_8 (input_bfd, addend, where); |
| 2148 | break; |
| 2149 | case 1: |
| 2150 | if (howto->pc_relative) |
| 2151 | addend -= 2; |
| 2152 | bfd_put_16 (input_bfd, addend, where); |
| 2153 | break; |
| 2154 | case 2: |
| 2155 | if (howto->pc_relative) |
| 2156 | addend -= 4; |
| 2157 | bfd_put_32 (input_bfd, addend, where); |
| 2158 | break; |
| 2159 | } |
| 2160 | } |
| 2161 | } |
| 2162 | else |
| 2163 | { |
| 2164 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 2165 | while (h->root.type == bfd_link_hash_indirect |
| 2166 | || h->root.type == bfd_link_hash_warning) |
| 2167 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2168 | |
| 2169 | relocation = 0; |
| 2170 | if (h->root.type == bfd_link_hash_defined |
| 2171 | || h->root.type == bfd_link_hash_defweak) |
| 2172 | { |
| 2173 | sec = h->root.u.def.section; |
| 2174 | if (sec->output_section == NULL) |
| 2175 | /* Set a flag that will be cleared later if we find a |
| 2176 | relocation value for this symbol. output_section |
| 2177 | is typically NULL for symbols satisfied by a shared |
| 2178 | library. */ |
| 2179 | unresolved_reloc = true; |
| 2180 | else |
| 2181 | relocation = (h->root.u.def.value |
| 2182 | + sec->output_section->vma |
| 2183 | + sec->output_offset); |
| 2184 | } |
| 2185 | else if (h->root.type == bfd_link_hash_undefweak) |
| 2186 | ; |
| 2187 | else if (info->shared |
| 2188 | && (!info->symbolic || info->allow_shlib_undefined) |
| 2189 | && !info->no_undefined |
| 2190 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) |
| 2191 | ; |
| 2192 | else |
| 2193 | { |
| 2194 | if (! ((*info->callbacks->undefined_symbol) |
| 2195 | (info, h->root.root.string, input_bfd, |
| 2196 | input_section, rel->r_offset, |
| 2197 | (!info->shared || info->no_undefined |
| 2198 | || ELF_ST_VISIBILITY (h->other))))) |
| 2199 | return false; |
| 2200 | } |
| 2201 | } |
| 2202 | |
| 2203 | switch (r_type) |
| 2204 | { |
| 2205 | case R_386_GOT32: |
| 2206 | /* Relocation is to the entry for this symbol in the global |
| 2207 | offset table. */ |
| 2208 | if (htab->sgot == NULL) |
| 2209 | abort (); |
| 2210 | |
| 2211 | if (h != NULL) |
| 2212 | { |
| 2213 | boolean dyn; |
| 2214 | |
| 2215 | off = h->got.offset; |
| 2216 | dyn = htab->elf.dynamic_sections_created; |
| 2217 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h) |
| 2218 | || (info->shared |
| 2219 | && (info->symbolic |
| 2220 | || h->dynindx == -1 |
| 2221 | || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) |
| 2222 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) |
| 2223 | { |
| 2224 | /* This is actually a static link, or it is a |
| 2225 | -Bsymbolic link and the symbol is defined |
| 2226 | locally, or the symbol was forced to be local |
| 2227 | because of a version file. We must initialize |
| 2228 | this entry in the global offset table. Since the |
| 2229 | offset must always be a multiple of 4, we use the |
| 2230 | least significant bit to record whether we have |
| 2231 | initialized it already. |
| 2232 | |
| 2233 | When doing a dynamic link, we create a .rel.got |
| 2234 | relocation entry to initialize the value. This |
| 2235 | is done in the finish_dynamic_symbol routine. */ |
| 2236 | if ((off & 1) != 0) |
| 2237 | off &= ~1; |
| 2238 | else |
| 2239 | { |
| 2240 | bfd_put_32 (output_bfd, relocation, |
| 2241 | htab->sgot->contents + off); |
| 2242 | h->got.offset |= 1; |
| 2243 | } |
| 2244 | } |
| 2245 | else |
| 2246 | unresolved_reloc = false; |
| 2247 | } |
| 2248 | else |
| 2249 | { |
| 2250 | if (local_got_offsets == NULL) |
| 2251 | abort (); |
| 2252 | |
| 2253 | off = local_got_offsets[r_symndx]; |
| 2254 | |
| 2255 | /* The offset must always be a multiple of 4. We use |
| 2256 | the least significant bit to record whether we have |
| 2257 | already generated the necessary reloc. */ |
| 2258 | if ((off & 1) != 0) |
| 2259 | off &= ~1; |
| 2260 | else |
| 2261 | { |
| 2262 | bfd_put_32 (output_bfd, relocation, |
| 2263 | htab->sgot->contents + off); |
| 2264 | |
| 2265 | if (info->shared) |
| 2266 | { |
| 2267 | asection *srelgot; |
| 2268 | Elf_Internal_Rel outrel; |
| 2269 | Elf32_External_Rel *loc; |
| 2270 | |
| 2271 | srelgot = htab->srelgot; |
| 2272 | if (srelgot == NULL) |
| 2273 | abort (); |
| 2274 | |
| 2275 | outrel.r_offset = (htab->sgot->output_section->vma |
| 2276 | + htab->sgot->output_offset |
| 2277 | + off); |
| 2278 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2279 | loc = (Elf32_External_Rel *) srelgot->contents; |
| 2280 | loc += srelgot->reloc_count++; |
| 2281 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2282 | } |
| 2283 | |
| 2284 | local_got_offsets[r_symndx] |= 1; |
| 2285 | } |
| 2286 | } |
| 2287 | |
| 2288 | if (off >= (bfd_vma) -2) |
| 2289 | abort (); |
| 2290 | |
| 2291 | relocation = htab->sgot->output_offset + off; |
| 2292 | break; |
| 2293 | |
| 2294 | case R_386_GOTOFF: |
| 2295 | /* Relocation is relative to the start of the global offset |
| 2296 | table. */ |
| 2297 | |
| 2298 | /* Note that sgot->output_offset is not involved in this |
| 2299 | calculation. We always want the start of .got. If we |
| 2300 | defined _GLOBAL_OFFSET_TABLE in a different way, as is |
| 2301 | permitted by the ABI, we might have to change this |
| 2302 | calculation. */ |
| 2303 | relocation -= htab->sgot->output_section->vma; |
| 2304 | break; |
| 2305 | |
| 2306 | case R_386_GOTPC: |
| 2307 | /* Use global offset table as symbol value. */ |
| 2308 | relocation = htab->sgot->output_section->vma; |
| 2309 | unresolved_reloc = false; |
| 2310 | break; |
| 2311 | |
| 2312 | case R_386_PLT32: |
| 2313 | /* Relocation is to the entry for this symbol in the |
| 2314 | procedure linkage table. */ |
| 2315 | |
| 2316 | /* Resolve a PLT32 reloc against a local symbol directly, |
| 2317 | without using the procedure linkage table. */ |
| 2318 | if (h == NULL) |
| 2319 | break; |
| 2320 | |
| 2321 | if (h->plt.offset == (bfd_vma) -1 |
| 2322 | || htab->splt == NULL) |
| 2323 | { |
| 2324 | /* We didn't make a PLT entry for this symbol. This |
| 2325 | happens when statically linking PIC code, or when |
| 2326 | using -Bsymbolic. */ |
| 2327 | break; |
| 2328 | } |
| 2329 | |
| 2330 | relocation = (htab->splt->output_section->vma |
| 2331 | + htab->splt->output_offset |
| 2332 | + h->plt.offset); |
| 2333 | unresolved_reloc = false; |
| 2334 | break; |
| 2335 | |
| 2336 | case R_386_32: |
| 2337 | case R_386_PC32: |
| 2338 | /* r_symndx will be zero only for relocs against symbols |
| 2339 | from removed linkonce sections, or sections discarded by |
| 2340 | a linker script. */ |
| 2341 | if (r_symndx == 0 |
| 2342 | || (input_section->flags & SEC_ALLOC) == 0) |
| 2343 | break; |
| 2344 | |
| 2345 | if ((info->shared |
| 2346 | && (r_type != R_386_PC32 |
| 2347 | || (h != NULL |
| 2348 | && h->dynindx != -1 |
| 2349 | && (! info->symbolic |
| 2350 | || (h->elf_link_hash_flags |
| 2351 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| 2352 | || (!info->shared |
| 2353 | && h != NULL |
| 2354 | && h->dynindx != -1 |
| 2355 | && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 |
| 2356 | && (((h->elf_link_hash_flags |
| 2357 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
| 2358 | && (h->elf_link_hash_flags |
| 2359 | & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 2360 | || h->root.type == bfd_link_hash_undefweak |
| 2361 | || h->root.type == bfd_link_hash_undefined))) |
| 2362 | { |
| 2363 | Elf_Internal_Rel outrel; |
| 2364 | boolean skip, relocate; |
| 2365 | asection *sreloc; |
| 2366 | Elf32_External_Rel *loc; |
| 2367 | |
| 2368 | /* When generating a shared object, these relocations |
| 2369 | are copied into the output file to be resolved at run |
| 2370 | time. */ |
| 2371 | |
| 2372 | skip = false; |
| 2373 | relocate = false; |
| 2374 | |
| 2375 | outrel.r_offset = |
| 2376 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 2377 | rel->r_offset); |
| 2378 | if (outrel.r_offset == (bfd_vma) -1) |
| 2379 | skip = true; |
| 2380 | else if (outrel.r_offset == (bfd_vma) -2) |
| 2381 | skip = true, relocate = true; |
| 2382 | outrel.r_offset += (input_section->output_section->vma |
| 2383 | + input_section->output_offset); |
| 2384 | |
| 2385 | if (skip) |
| 2386 | memset (&outrel, 0, sizeof outrel); |
| 2387 | else if (h != NULL |
| 2388 | && h->dynindx != -1 |
| 2389 | && (r_type == R_386_PC32 |
| 2390 | || !info->shared |
| 2391 | || !info->symbolic |
| 2392 | || (h->elf_link_hash_flags |
| 2393 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) |
| 2394 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
| 2395 | else |
| 2396 | { |
| 2397 | /* This symbol is local, or marked to become local. */ |
| 2398 | relocate = true; |
| 2399 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2400 | } |
| 2401 | |
| 2402 | sreloc = elf_section_data (input_section)->sreloc; |
| 2403 | if (sreloc == NULL) |
| 2404 | abort (); |
| 2405 | |
| 2406 | loc = (Elf32_External_Rel *) sreloc->contents; |
| 2407 | loc += sreloc->reloc_count++; |
| 2408 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2409 | |
| 2410 | /* If this reloc is against an external symbol, we do |
| 2411 | not want to fiddle with the addend. Otherwise, we |
| 2412 | need to include the symbol value so that it becomes |
| 2413 | an addend for the dynamic reloc. */ |
| 2414 | if (! relocate) |
| 2415 | continue; |
| 2416 | } |
| 2417 | break; |
| 2418 | |
| 2419 | case R_386_TLS_GD: |
| 2420 | case R_386_TLS_IE_32: |
| 2421 | r_type = elf_i386_tls_transition (info, r_type, h == NULL); |
| 2422 | tls_type = GOT_UNKNOWN; |
| 2423 | if (h == NULL && local_got_offsets) |
| 2424 | tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx]; |
| 2425 | else if (h != NULL) |
| 2426 | { |
| 2427 | tls_type = elf_i386_hash_entry(h)->tls_type; |
| 2428 | if (!info->shared && h->dynindx == -1 && tls_type == GOT_TLS_IE) |
| 2429 | r_type = R_386_TLS_LE_32; |
| 2430 | } |
| 2431 | if (r_type == R_386_TLS_GD && tls_type == GOT_TLS_IE) |
| 2432 | r_type = R_386_TLS_IE_32; |
| 2433 | |
| 2434 | if (r_type == R_386_TLS_LE_32) |
| 2435 | { |
| 2436 | BFD_ASSERT (! unresolved_reloc); |
| 2437 | if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) |
| 2438 | { |
| 2439 | unsigned int val, type; |
| 2440 | bfd_vma roff; |
| 2441 | |
| 2442 | /* GD->LE transition. */ |
| 2443 | BFD_ASSERT (rel->r_offset >= 2); |
| 2444 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 2445 | BFD_ASSERT (type == 0x8d || type == 0x04); |
| 2446 | BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size); |
| 2447 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2448 | contents + rel->r_offset + 4) |
| 2449 | == 0xe8); |
| 2450 | BFD_ASSERT (rel + 1 < relend); |
| 2451 | BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); |
| 2452 | roff = rel->r_offset + 5; |
| 2453 | val = bfd_get_8 (input_bfd, |
| 2454 | contents + rel->r_offset - 1); |
| 2455 | if (type == 0x04) |
| 2456 | { |
| 2457 | /* leal foo(,%reg,1), %eax; call ___tls_get_addr |
| 2458 | Change it into: |
| 2459 | movl %gs:0, %eax; subl $foo@tpoff, %eax |
| 2460 | (6 byte form of subl). */ |
| 2461 | BFD_ASSERT (rel->r_offset >= 3); |
| 2462 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2463 | contents + rel->r_offset - 3) |
| 2464 | == 0x8d); |
| 2465 | BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3)); |
| 2466 | memcpy (contents + rel->r_offset - 3, |
| 2467 | "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
| 2468 | } |
| 2469 | else |
| 2470 | { |
| 2471 | BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); |
| 2472 | if (rel->r_offset + 10 <= input_section->_raw_size |
| 2473 | && bfd_get_8 (input_bfd, |
| 2474 | contents + rel->r_offset + 9) == 0x90) |
| 2475 | { |
| 2476 | /* leal foo(%reg), %eax; call ___tls_get_addr; nop |
| 2477 | Change it into: |
| 2478 | movl %gs:0, %eax; subl $foo@tpoff, %eax |
| 2479 | (6 byte form of subl). */ |
| 2480 | memcpy (contents + rel->r_offset - 2, |
| 2481 | "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
| 2482 | roff = rel->r_offset + 6; |
| 2483 | } |
| 2484 | else |
| 2485 | { |
| 2486 | /* leal foo(%reg), %eax; call ___tls_get_addr |
| 2487 | Change it into: |
| 2488 | movl %gs:0, %eax; subl $foo@tpoff, %eax |
| 2489 | (5 byte form of subl). */ |
| 2490 | memcpy (contents + rel->r_offset - 2, |
| 2491 | "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); |
| 2492 | } |
| 2493 | } |
| 2494 | bfd_put_32 (output_bfd, tpoff (info, relocation), |
| 2495 | contents + roff); |
| 2496 | /* Skip R_386_PLT32. */ |
| 2497 | rel++; |
| 2498 | continue; |
| 2499 | } |
| 2500 | else |
| 2501 | { |
| 2502 | unsigned int val, type; |
| 2503 | |
| 2504 | /* IE->LE transition: |
| 2505 | Originally it can be either: |
| 2506 | subl foo(%reg1), %reg2 |
| 2507 | or |
| 2508 | movl foo(%reg1), %reg2 |
| 2509 | We change it into: |
| 2510 | subl $foo, %reg2 |
| 2511 | or |
| 2512 | movl $foo, %reg2 (6 byte form) */ |
| 2513 | BFD_ASSERT (rel->r_offset >= 2); |
| 2514 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 2515 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 2516 | BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size); |
| 2517 | if (type == 0x8b) |
| 2518 | { |
| 2519 | /* movl */ |
| 2520 | BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4); |
| 2521 | bfd_put_8 (output_bfd, 0xc7, |
| 2522 | contents + rel->r_offset - 2); |
| 2523 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), |
| 2524 | contents + rel->r_offset - 1); |
| 2525 | } |
| 2526 | else if (type == 0x2b) |
| 2527 | { |
| 2528 | /* subl */ |
| 2529 | BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4); |
| 2530 | bfd_put_8 (output_bfd, 0x81, |
| 2531 | contents + rel->r_offset - 2); |
| 2532 | bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7), |
| 2533 | contents + rel->r_offset - 1); |
| 2534 | } |
| 2535 | else |
| 2536 | BFD_FAIL (); |
| 2537 | bfd_put_32 (output_bfd, tpoff (info, relocation), |
| 2538 | contents + rel->r_offset); |
| 2539 | continue; |
| 2540 | } |
| 2541 | } |
| 2542 | |
| 2543 | if (htab->sgot == NULL) |
| 2544 | abort (); |
| 2545 | |
| 2546 | if (h != NULL) |
| 2547 | off = h->got.offset; |
| 2548 | else |
| 2549 | { |
| 2550 | if (local_got_offsets == NULL) |
| 2551 | abort (); |
| 2552 | |
| 2553 | off = local_got_offsets[r_symndx]; |
| 2554 | } |
| 2555 | |
| 2556 | if ((off & 1) != 0) |
| 2557 | off &= ~1; |
| 2558 | else |
| 2559 | { |
| 2560 | Elf_Internal_Rel outrel; |
| 2561 | Elf32_External_Rel *loc; |
| 2562 | int dr_type, indx; |
| 2563 | |
| 2564 | if (htab->srelgot == NULL) |
| 2565 | abort (); |
| 2566 | |
| 2567 | outrel.r_offset = (htab->sgot->output_section->vma |
| 2568 | + htab->sgot->output_offset + off); |
| 2569 | |
| 2570 | indx = h && h->dynindx != -1 ? h->dynindx : 0; |
| 2571 | if (r_type == R_386_TLS_GD) |
| 2572 | dr_type = R_386_TLS_DTPMOD32; |
| 2573 | else |
| 2574 | dr_type = R_386_TLS_TPOFF32; |
| 2575 | if (dr_type == R_386_TLS_TPOFF32 && indx == 0) |
| 2576 | bfd_put_32 (output_bfd, relocation - dtpoff_base (info), |
| 2577 | htab->sgot->contents + off); |
| 2578 | else |
| 2579 | bfd_put_32 (output_bfd, 0, |
| 2580 | htab->sgot->contents + off); |
| 2581 | outrel.r_info = ELF32_R_INFO (indx, dr_type); |
| 2582 | loc = (Elf32_External_Rel *) htab->srelgot->contents; |
| 2583 | loc += htab->srelgot->reloc_count++; |
| 2584 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2585 | |
| 2586 | if (r_type == R_386_TLS_GD) |
| 2587 | { |
| 2588 | if (indx == 0) |
| 2589 | { |
| 2590 | BFD_ASSERT (! unresolved_reloc); |
| 2591 | bfd_put_32 (output_bfd, |
| 2592 | relocation - dtpoff_base (info), |
| 2593 | htab->sgot->contents + off + 4); |
| 2594 | } |
| 2595 | else |
| 2596 | { |
| 2597 | bfd_put_32 (output_bfd, 0, |
| 2598 | htab->sgot->contents + off + 4); |
| 2599 | outrel.r_info = ELF32_R_INFO (indx, |
| 2600 | R_386_TLS_DTPOFF32); |
| 2601 | outrel.r_offset += 4; |
| 2602 | htab->srelgot->reloc_count++; |
| 2603 | loc++; |
| 2604 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, |
| 2605 | loc); |
| 2606 | } |
| 2607 | } |
| 2608 | |
| 2609 | if (h != NULL) |
| 2610 | h->got.offset |= 1; |
| 2611 | else |
| 2612 | local_got_offsets[r_symndx] |= 1; |
| 2613 | } |
| 2614 | |
| 2615 | if (off >= (bfd_vma) -2) |
| 2616 | abort (); |
| 2617 | if (r_type == ELF32_R_TYPE (rel->r_info)) |
| 2618 | { |
| 2619 | relocation = htab->sgot->output_offset + off; |
| 2620 | unresolved_reloc = false; |
| 2621 | } |
| 2622 | else |
| 2623 | { |
| 2624 | unsigned int val, type; |
| 2625 | bfd_vma roff; |
| 2626 | |
| 2627 | /* GD->IE transition. */ |
| 2628 | BFD_ASSERT (rel->r_offset >= 2); |
| 2629 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 2630 | BFD_ASSERT (type == 0x8d || type == 0x04); |
| 2631 | BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size); |
| 2632 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) |
| 2633 | == 0xe8); |
| 2634 | BFD_ASSERT (rel + 1 < relend); |
| 2635 | BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); |
| 2636 | roff = rel->r_offset - 3; |
| 2637 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 2638 | if (type == 0x04) |
| 2639 | { |
| 2640 | /* leal foo(,%reg,1), %eax; call ___tls_get_addr |
| 2641 | Change it into: |
| 2642 | movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ |
| 2643 | BFD_ASSERT (rel->r_offset >= 3); |
| 2644 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2645 | contents + rel->r_offset - 3) |
| 2646 | == 0x8d); |
| 2647 | BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3)); |
| 2648 | val >>= 3; |
| 2649 | } |
| 2650 | else |
| 2651 | { |
| 2652 | /* leal foo(%reg), %eax; call ___tls_get_addr; nop |
| 2653 | Change it into: |
| 2654 | movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ |
| 2655 | BFD_ASSERT (rel->r_offset + 10 <= input_section->_raw_size); |
| 2656 | BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); |
| 2657 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2658 | contents + rel->r_offset + 9) |
| 2659 | == 0x90); |
| 2660 | roff = rel->r_offset - 2; |
| 2661 | } |
| 2662 | memcpy (contents + roff, |
| 2663 | "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12); |
| 2664 | contents[roff + 7] = 0x80 | (val & 7); |
| 2665 | bfd_put_32 (output_bfd, htab->sgot->output_offset + off, |
| 2666 | contents + roff + 8); |
| 2667 | /* Skip R_386_PLT32. */ |
| 2668 | rel++; |
| 2669 | continue; |
| 2670 | } |
| 2671 | break; |
| 2672 | |
| 2673 | case R_386_TLS_LDM: |
| 2674 | if (! info->shared) |
| 2675 | { |
| 2676 | unsigned int val; |
| 2677 | |
| 2678 | /* LD->LE transition: |
| 2679 | Ensure it is: |
| 2680 | leal foo(%reg), %eax; call ___tls_get_addr. |
| 2681 | We change it into: |
| 2682 | movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */ |
| 2683 | BFD_ASSERT (rel->r_offset >= 2); |
| 2684 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2) |
| 2685 | == 0x8d); |
| 2686 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 2687 | BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); |
| 2688 | BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size); |
| 2689 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) |
| 2690 | == 0xe8); |
| 2691 | BFD_ASSERT (rel + 1 < relend); |
| 2692 | BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); |
| 2693 | memcpy (contents + rel->r_offset - 2, |
| 2694 | "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11); |
| 2695 | /* Skip R_386_PLT32. */ |
| 2696 | rel++; |
| 2697 | continue; |
| 2698 | } |
| 2699 | |
| 2700 | if (htab->sgot == NULL) |
| 2701 | abort (); |
| 2702 | |
| 2703 | off = htab->tls_ldm_got.offset; |
| 2704 | if (off & 1) |
| 2705 | off &= ~1; |
| 2706 | else |
| 2707 | { |
| 2708 | Elf_Internal_Rel outrel; |
| 2709 | Elf32_External_Rel *loc; |
| 2710 | |
| 2711 | if (htab->srelgot == NULL) |
| 2712 | abort (); |
| 2713 | |
| 2714 | outrel.r_offset = (htab->sgot->output_section->vma |
| 2715 | + htab->sgot->output_offset + off); |
| 2716 | |
| 2717 | bfd_put_32 (output_bfd, 0, |
| 2718 | htab->sgot->contents + off); |
| 2719 | bfd_put_32 (output_bfd, 0, |
| 2720 | htab->sgot->contents + off + 4); |
| 2721 | outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32); |
| 2722 | loc = (Elf32_External_Rel *) htab->srelgot->contents; |
| 2723 | loc += htab->srelgot->reloc_count++; |
| 2724 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2725 | htab->tls_ldm_got.offset |= 1; |
| 2726 | } |
| 2727 | relocation = htab->sgot->output_offset + off; |
| 2728 | unresolved_reloc = false; |
| 2729 | break; |
| 2730 | |
| 2731 | case R_386_TLS_LDO_32: |
| 2732 | if (info->shared) |
| 2733 | relocation -= dtpoff_base (info); |
| 2734 | else |
| 2735 | /* When converting LDO to LE, we must negate. */ |
| 2736 | relocation = -tpoff (info, relocation); |
| 2737 | break; |
| 2738 | |
| 2739 | case R_386_TLS_LE_32: |
| 2740 | relocation = tpoff (info, relocation); |
| 2741 | break; |
| 2742 | |
| 2743 | case R_386_TLS_LE: |
| 2744 | relocation = -tpoff (info, relocation); |
| 2745 | break; |
| 2746 | |
| 2747 | default: |
| 2748 | break; |
| 2749 | } |
| 2750 | |
| 2751 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| 2752 | because such sections are not SEC_ALLOC and thus ld.so will |
| 2753 | not process them. */ |
| 2754 | if (unresolved_reloc |
| 2755 | && !((input_section->flags & SEC_DEBUGGING) != 0 |
| 2756 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) |
| 2757 | (*_bfd_error_handler) |
| 2758 | (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), |
| 2759 | bfd_archive_filename (input_bfd), |
| 2760 | bfd_get_section_name (input_bfd, input_section), |
| 2761 | (long) rel->r_offset, |
| 2762 | h->root.root.string); |
| 2763 | |
| 2764 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 2765 | contents, rel->r_offset, |
| 2766 | relocation, (bfd_vma) 0); |
| 2767 | |
| 2768 | if (r != bfd_reloc_ok) |
| 2769 | { |
| 2770 | const char *name; |
| 2771 | |
| 2772 | if (h != NULL) |
| 2773 | name = h->root.root.string; |
| 2774 | else |
| 2775 | { |
| 2776 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 2777 | symtab_hdr->sh_link, |
| 2778 | sym->st_name); |
| 2779 | if (name == NULL) |
| 2780 | return false; |
| 2781 | if (*name == '\0') |
| 2782 | name = bfd_section_name (input_bfd, sec); |
| 2783 | } |
| 2784 | |
| 2785 | if (r == bfd_reloc_overflow) |
| 2786 | { |
| 2787 | if (! ((*info->callbacks->reloc_overflow) |
| 2788 | (info, name, howto->name, (bfd_vma) 0, |
| 2789 | input_bfd, input_section, rel->r_offset))) |
| 2790 | return false; |
| 2791 | } |
| 2792 | else |
| 2793 | { |
| 2794 | (*_bfd_error_handler) |
| 2795 | (_("%s(%s+0x%lx): reloc against `%s': error %d"), |
| 2796 | bfd_archive_filename (input_bfd), |
| 2797 | bfd_get_section_name (input_bfd, input_section), |
| 2798 | (long) rel->r_offset, name, (int) r); |
| 2799 | return false; |
| 2800 | } |
| 2801 | } |
| 2802 | } |
| 2803 | |
| 2804 | return true; |
| 2805 | } |
| 2806 | |
| 2807 | /* Finish up dynamic symbol handling. We set the contents of various |
| 2808 | dynamic sections here. */ |
| 2809 | |
| 2810 | static boolean |
| 2811 | elf_i386_finish_dynamic_symbol (output_bfd, info, h, sym) |
| 2812 | bfd *output_bfd; |
| 2813 | struct bfd_link_info *info; |
| 2814 | struct elf_link_hash_entry *h; |
| 2815 | Elf_Internal_Sym *sym; |
| 2816 | { |
| 2817 | struct elf_i386_link_hash_table *htab; |
| 2818 | |
| 2819 | htab = elf_i386_hash_table (info); |
| 2820 | |
| 2821 | if (h->plt.offset != (bfd_vma) -1) |
| 2822 | { |
| 2823 | bfd_vma plt_index; |
| 2824 | bfd_vma got_offset; |
| 2825 | Elf_Internal_Rel rel; |
| 2826 | Elf32_External_Rel *loc; |
| 2827 | |
| 2828 | /* This symbol has an entry in the procedure linkage table. Set |
| 2829 | it up. */ |
| 2830 | |
| 2831 | if (h->dynindx == -1 |
| 2832 | || htab->splt == NULL |
| 2833 | || htab->sgotplt == NULL |
| 2834 | || htab->srelplt == NULL) |
| 2835 | abort (); |
| 2836 | |
| 2837 | /* Get the index in the procedure linkage table which |
| 2838 | corresponds to this symbol. This is the index of this symbol |
| 2839 | in all the symbols for which we are making plt entries. The |
| 2840 | first entry in the procedure linkage table is reserved. */ |
| 2841 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 2842 | |
| 2843 | /* Get the offset into the .got table of the entry that |
| 2844 | corresponds to this function. Each .got entry is 4 bytes. |
| 2845 | The first three are reserved. */ |
| 2846 | got_offset = (plt_index + 3) * 4; |
| 2847 | |
| 2848 | /* Fill in the entry in the procedure linkage table. */ |
| 2849 | if (! info->shared) |
| 2850 | { |
| 2851 | memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry, |
| 2852 | PLT_ENTRY_SIZE); |
| 2853 | bfd_put_32 (output_bfd, |
| 2854 | (htab->sgotplt->output_section->vma |
| 2855 | + htab->sgotplt->output_offset |
| 2856 | + got_offset), |
| 2857 | htab->splt->contents + h->plt.offset + 2); |
| 2858 | } |
| 2859 | else |
| 2860 | { |
| 2861 | memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry, |
| 2862 | PLT_ENTRY_SIZE); |
| 2863 | bfd_put_32 (output_bfd, got_offset, |
| 2864 | htab->splt->contents + h->plt.offset + 2); |
| 2865 | } |
| 2866 | |
| 2867 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), |
| 2868 | htab->splt->contents + h->plt.offset + 7); |
| 2869 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), |
| 2870 | htab->splt->contents + h->plt.offset + 12); |
| 2871 | |
| 2872 | /* Fill in the entry in the global offset table. */ |
| 2873 | bfd_put_32 (output_bfd, |
| 2874 | (htab->splt->output_section->vma |
| 2875 | + htab->splt->output_offset |
| 2876 | + h->plt.offset |
| 2877 | + 6), |
| 2878 | htab->sgotplt->contents + got_offset); |
| 2879 | |
| 2880 | /* Fill in the entry in the .rel.plt section. */ |
| 2881 | rel.r_offset = (htab->sgotplt->output_section->vma |
| 2882 | + htab->sgotplt->output_offset |
| 2883 | + got_offset); |
| 2884 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); |
| 2885 | loc = (Elf32_External_Rel *) htab->srelplt->contents + plt_index; |
| 2886 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 2887 | |
| 2888 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 2889 | { |
| 2890 | /* Mark the symbol as undefined, rather than as defined in |
| 2891 | the .plt section. Leave the value alone. This is a clue |
| 2892 | for the dynamic linker, to make function pointer |
| 2893 | comparisons work between an application and shared |
| 2894 | library. */ |
| 2895 | sym->st_shndx = SHN_UNDEF; |
| 2896 | } |
| 2897 | } |
| 2898 | |
| 2899 | if (h->got.offset != (bfd_vma) -1 |
| 2900 | && elf_i386_hash_entry(h)->tls_type != GOT_TLS_GD |
| 2901 | && elf_i386_hash_entry(h)->tls_type != GOT_TLS_IE) |
| 2902 | { |
| 2903 | Elf_Internal_Rel rel; |
| 2904 | Elf32_External_Rel *loc; |
| 2905 | |
| 2906 | /* This symbol has an entry in the global offset table. Set it |
| 2907 | up. */ |
| 2908 | |
| 2909 | if (htab->sgot == NULL || htab->srelgot == NULL) |
| 2910 | abort (); |
| 2911 | |
| 2912 | rel.r_offset = (htab->sgot->output_section->vma |
| 2913 | + htab->sgot->output_offset |
| 2914 | + (h->got.offset & ~(bfd_vma) 1)); |
| 2915 | |
| 2916 | /* If this is a static link, or it is a -Bsymbolic link and the |
| 2917 | symbol is defined locally or was forced to be local because |
| 2918 | of a version file, we just want to emit a RELATIVE reloc. |
| 2919 | The entry in the global offset table will already have been |
| 2920 | initialized in the relocate_section function. */ |
| 2921 | if (info->shared |
| 2922 | && (info->symbolic |
| 2923 | || h->dynindx == -1 |
| 2924 | || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) |
| 2925 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) |
| 2926 | { |
| 2927 | BFD_ASSERT((h->got.offset & 1) != 0); |
| 2928 | rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2929 | } |
| 2930 | else |
| 2931 | { |
| 2932 | BFD_ASSERT((h->got.offset & 1) == 0); |
| 2933 | bfd_put_32 (output_bfd, (bfd_vma) 0, |
| 2934 | htab->sgot->contents + h->got.offset); |
| 2935 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); |
| 2936 | } |
| 2937 | |
| 2938 | loc = (Elf32_External_Rel *) htab->srelgot->contents; |
| 2939 | loc += htab->srelgot->reloc_count++; |
| 2940 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 2941 | } |
| 2942 | |
| 2943 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) |
| 2944 | { |
| 2945 | Elf_Internal_Rel rel; |
| 2946 | Elf32_External_Rel *loc; |
| 2947 | |
| 2948 | /* This symbol needs a copy reloc. Set it up. */ |
| 2949 | |
| 2950 | if (h->dynindx == -1 |
| 2951 | || (h->root.type != bfd_link_hash_defined |
| 2952 | && h->root.type != bfd_link_hash_defweak) |
| 2953 | || htab->srelbss == NULL) |
| 2954 | abort (); |
| 2955 | |
| 2956 | rel.r_offset = (h->root.u.def.value |
| 2957 | + h->root.u.def.section->output_section->vma |
| 2958 | + h->root.u.def.section->output_offset); |
| 2959 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); |
| 2960 | loc = (Elf32_External_Rel *) htab->srelbss->contents; |
| 2961 | loc += htab->srelbss->reloc_count++; |
| 2962 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 2963 | } |
| 2964 | |
| 2965 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ |
| 2966 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| 2967 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 2968 | sym->st_shndx = SHN_ABS; |
| 2969 | |
| 2970 | return true; |
| 2971 | } |
| 2972 | |
| 2973 | /* Used to decide how to sort relocs in an optimal manner for the |
| 2974 | dynamic linker, before writing them out. */ |
| 2975 | |
| 2976 | static enum elf_reloc_type_class |
| 2977 | elf_i386_reloc_type_class (rela) |
| 2978 | const Elf_Internal_Rela *rela; |
| 2979 | { |
| 2980 | switch ((int) ELF32_R_TYPE (rela->r_info)) |
| 2981 | { |
| 2982 | case R_386_RELATIVE: |
| 2983 | return reloc_class_relative; |
| 2984 | case R_386_JUMP_SLOT: |
| 2985 | return reloc_class_plt; |
| 2986 | case R_386_COPY: |
| 2987 | return reloc_class_copy; |
| 2988 | default: |
| 2989 | return reloc_class_normal; |
| 2990 | } |
| 2991 | } |
| 2992 | |
| 2993 | /* Finish up the dynamic sections. */ |
| 2994 | |
| 2995 | static boolean |
| 2996 | elf_i386_finish_dynamic_sections (output_bfd, info) |
| 2997 | bfd *output_bfd; |
| 2998 | struct bfd_link_info *info; |
| 2999 | { |
| 3000 | struct elf_i386_link_hash_table *htab; |
| 3001 | bfd *dynobj; |
| 3002 | asection *sdyn; |
| 3003 | |
| 3004 | htab = elf_i386_hash_table (info); |
| 3005 | dynobj = htab->elf.dynobj; |
| 3006 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 3007 | |
| 3008 | if (htab->elf.dynamic_sections_created) |
| 3009 | { |
| 3010 | Elf32_External_Dyn *dyncon, *dynconend; |
| 3011 | |
| 3012 | if (sdyn == NULL || htab->sgot == NULL) |
| 3013 | abort (); |
| 3014 | |
| 3015 | dyncon = (Elf32_External_Dyn *) sdyn->contents; |
| 3016 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); |
| 3017 | for (; dyncon < dynconend; dyncon++) |
| 3018 | { |
| 3019 | Elf_Internal_Dyn dyn; |
| 3020 | asection *s; |
| 3021 | |
| 3022 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); |
| 3023 | |
| 3024 | switch (dyn.d_tag) |
| 3025 | { |
| 3026 | default: |
| 3027 | continue; |
| 3028 | |
| 3029 | case DT_PLTGOT: |
| 3030 | dyn.d_un.d_ptr = htab->sgot->output_section->vma; |
| 3031 | break; |
| 3032 | |
| 3033 | case DT_JMPREL: |
| 3034 | dyn.d_un.d_ptr = htab->srelplt->output_section->vma; |
| 3035 | break; |
| 3036 | |
| 3037 | case DT_PLTRELSZ: |
| 3038 | s = htab->srelplt->output_section; |
| 3039 | if (s->_cooked_size != 0) |
| 3040 | dyn.d_un.d_val = s->_cooked_size; |
| 3041 | else |
| 3042 | dyn.d_un.d_val = s->_raw_size; |
| 3043 | break; |
| 3044 | |
| 3045 | case DT_RELSZ: |
| 3046 | /* My reading of the SVR4 ABI indicates that the |
| 3047 | procedure linkage table relocs (DT_JMPREL) should be |
| 3048 | included in the overall relocs (DT_REL). This is |
| 3049 | what Solaris does. However, UnixWare can not handle |
| 3050 | that case. Therefore, we override the DT_RELSZ entry |
| 3051 | here to make it not include the JMPREL relocs. Since |
| 3052 | the linker script arranges for .rel.plt to follow all |
| 3053 | other relocation sections, we don't have to worry |
| 3054 | about changing the DT_REL entry. */ |
| 3055 | if (htab->srelplt != NULL) |
| 3056 | { |
| 3057 | s = htab->srelplt->output_section; |
| 3058 | if (s->_cooked_size != 0) |
| 3059 | dyn.d_un.d_val -= s->_cooked_size; |
| 3060 | else |
| 3061 | dyn.d_un.d_val -= s->_raw_size; |
| 3062 | } |
| 3063 | break; |
| 3064 | } |
| 3065 | |
| 3066 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 3067 | } |
| 3068 | |
| 3069 | /* Fill in the first entry in the procedure linkage table. */ |
| 3070 | if (htab->splt && htab->splt->_raw_size > 0) |
| 3071 | { |
| 3072 | if (info->shared) |
| 3073 | memcpy (htab->splt->contents, |
| 3074 | elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE); |
| 3075 | else |
| 3076 | { |
| 3077 | memcpy (htab->splt->contents, |
| 3078 | elf_i386_plt0_entry, PLT_ENTRY_SIZE); |
| 3079 | bfd_put_32 (output_bfd, |
| 3080 | (htab->sgotplt->output_section->vma |
| 3081 | + htab->sgotplt->output_offset |
| 3082 | + 4), |
| 3083 | htab->splt->contents + 2); |
| 3084 | bfd_put_32 (output_bfd, |
| 3085 | (htab->sgotplt->output_section->vma |
| 3086 | + htab->sgotplt->output_offset |
| 3087 | + 8), |
| 3088 | htab->splt->contents + 8); |
| 3089 | } |
| 3090 | |
| 3091 | /* UnixWare sets the entsize of .plt to 4, although that doesn't |
| 3092 | really seem like the right value. */ |
| 3093 | elf_section_data (htab->splt->output_section) |
| 3094 | ->this_hdr.sh_entsize = 4; |
| 3095 | } |
| 3096 | } |
| 3097 | |
| 3098 | if (htab->sgotplt) |
| 3099 | { |
| 3100 | /* Fill in the first three entries in the global offset table. */ |
| 3101 | if (htab->sgotplt->_raw_size > 0) |
| 3102 | { |
| 3103 | bfd_put_32 (output_bfd, |
| 3104 | (sdyn == NULL ? (bfd_vma) 0 |
| 3105 | : sdyn->output_section->vma + sdyn->output_offset), |
| 3106 | htab->sgotplt->contents); |
| 3107 | bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4); |
| 3108 | bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8); |
| 3109 | } |
| 3110 | |
| 3111 | elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4; |
| 3112 | } |
| 3113 | return true; |
| 3114 | } |
| 3115 | |
| 3116 | #define TARGET_LITTLE_SYM bfd_elf32_i386_vec |
| 3117 | #define TARGET_LITTLE_NAME "elf32-i386" |
| 3118 | #define ELF_ARCH bfd_arch_i386 |
| 3119 | #define ELF_MACHINE_CODE EM_386 |
| 3120 | #define ELF_MAXPAGESIZE 0x1000 |
| 3121 | |
| 3122 | #define elf_backend_can_gc_sections 1 |
| 3123 | #define elf_backend_can_refcount 1 |
| 3124 | #define elf_backend_want_got_plt 1 |
| 3125 | #define elf_backend_plt_readonly 1 |
| 3126 | #define elf_backend_want_plt_sym 0 |
| 3127 | #define elf_backend_got_header_size 12 |
| 3128 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE |
| 3129 | |
| 3130 | #define elf_info_to_howto elf_i386_info_to_howto |
| 3131 | #define elf_info_to_howto_rel elf_i386_info_to_howto_rel |
| 3132 | |
| 3133 | #define bfd_elf32_mkobject elf_i386_mkobject |
| 3134 | #define elf_backend_object_p elf_i386_object_p |
| 3135 | |
| 3136 | #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name |
| 3137 | #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create |
| 3138 | #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup |
| 3139 | |
| 3140 | #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol |
| 3141 | #define elf_backend_check_relocs elf_i386_check_relocs |
| 3142 | #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol |
| 3143 | #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections |
| 3144 | #define elf_backend_fake_sections elf_i386_fake_sections |
| 3145 | #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections |
| 3146 | #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol |
| 3147 | #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook |
| 3148 | #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook |
| 3149 | #define elf_backend_grok_prstatus elf_i386_grok_prstatus |
| 3150 | #define elf_backend_grok_psinfo elf_i386_grok_psinfo |
| 3151 | #define elf_backend_reloc_type_class elf_i386_reloc_type_class |
| 3152 | #define elf_backend_relocate_section elf_i386_relocate_section |
| 3153 | #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections |
| 3154 | |
| 3155 | #ifndef ELF32_I386_C_INCLUDED |
| 3156 | #include "elf32-target.h" |
| 3157 | #endif |