| 1 | /* Xtensa-specific support for 32-bit ELF. |
| 2 | Copyright 2003 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of BFD, the Binary File Descriptor library. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or |
| 7 | modify it under the terms of the GNU General Public License as |
| 8 | published by the Free Software Foundation; either version 2 of the |
| 9 | License, or (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, but |
| 12 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
| 19 | 02111-1307, USA. */ |
| 20 | |
| 21 | #include "bfd.h" |
| 22 | #include "sysdep.h" |
| 23 | |
| 24 | #ifdef ANSI_PROTOTYPES |
| 25 | #include <stdarg.h> |
| 26 | #else |
| 27 | #include <varargs.h> |
| 28 | #endif |
| 29 | #include <strings.h> |
| 30 | |
| 31 | #include "bfdlink.h" |
| 32 | #include "libbfd.h" |
| 33 | #include "elf-bfd.h" |
| 34 | #include "elf/xtensa.h" |
| 35 | #include "xtensa-isa.h" |
| 36 | #include "xtensa-config.h" |
| 37 | |
| 38 | /* Main interface functions. */ |
| 39 | static void elf_xtensa_info_to_howto_rela |
| 40 | PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); |
| 41 | static reloc_howto_type *elf_xtensa_reloc_type_lookup |
| 42 | PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); |
| 43 | extern int xtensa_read_table_entries |
| 44 | PARAMS ((bfd *, asection *, property_table_entry **, const char *)); |
| 45 | static bfd_boolean elf_xtensa_check_relocs |
| 46 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 47 | const Elf_Internal_Rela *)); |
| 48 | static void elf_xtensa_hide_symbol |
| 49 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean)); |
| 50 | static void elf_xtensa_copy_indirect_symbol |
| 51 | PARAMS ((const struct elf_backend_data *, struct elf_link_hash_entry *, |
| 52 | struct elf_link_hash_entry *)); |
| 53 | static asection *elf_xtensa_gc_mark_hook |
| 54 | PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *, |
| 55 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); |
| 56 | static bfd_boolean elf_xtensa_gc_sweep_hook |
| 57 | PARAMS ((bfd *, struct bfd_link_info *, asection *, |
| 58 | const Elf_Internal_Rela *)); |
| 59 | static bfd_boolean elf_xtensa_create_dynamic_sections |
| 60 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 61 | static bfd_boolean elf_xtensa_adjust_dynamic_symbol |
| 62 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); |
| 63 | static bfd_boolean elf_xtensa_size_dynamic_sections |
| 64 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 65 | static bfd_boolean elf_xtensa_modify_segment_map |
| 66 | PARAMS ((bfd *)); |
| 67 | static bfd_boolean elf_xtensa_relocate_section |
| 68 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| 69 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); |
| 70 | static bfd_boolean elf_xtensa_relax_section |
| 71 | PARAMS ((bfd *, asection *, struct bfd_link_info *, bfd_boolean *again)); |
| 72 | static bfd_boolean elf_xtensa_finish_dynamic_symbol |
| 73 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, |
| 74 | Elf_Internal_Sym *)); |
| 75 | static bfd_boolean elf_xtensa_finish_dynamic_sections |
| 76 | PARAMS ((bfd *, struct bfd_link_info *)); |
| 77 | static bfd_boolean elf_xtensa_merge_private_bfd_data |
| 78 | PARAMS ((bfd *, bfd *)); |
| 79 | static bfd_boolean elf_xtensa_set_private_flags |
| 80 | PARAMS ((bfd *, flagword)); |
| 81 | extern flagword elf_xtensa_get_private_bfd_flags |
| 82 | PARAMS ((bfd *)); |
| 83 | static bfd_boolean elf_xtensa_print_private_bfd_data |
| 84 | PARAMS ((bfd *, PTR)); |
| 85 | static bfd_boolean elf_xtensa_object_p |
| 86 | PARAMS ((bfd *)); |
| 87 | static void elf_xtensa_final_write_processing |
| 88 | PARAMS ((bfd *, bfd_boolean)); |
| 89 | static enum elf_reloc_type_class elf_xtensa_reloc_type_class |
| 90 | PARAMS ((const Elf_Internal_Rela *)); |
| 91 | static bfd_boolean elf_xtensa_discard_info |
| 92 | PARAMS ((bfd *, struct elf_reloc_cookie *, struct bfd_link_info *)); |
| 93 | static bfd_boolean elf_xtensa_ignore_discarded_relocs |
| 94 | PARAMS ((asection *)); |
| 95 | static bfd_boolean elf_xtensa_grok_prstatus |
| 96 | PARAMS ((bfd *, Elf_Internal_Note *)); |
| 97 | static bfd_boolean elf_xtensa_grok_psinfo |
| 98 | PARAMS ((bfd *, Elf_Internal_Note *)); |
| 99 | static bfd_boolean elf_xtensa_new_section_hook |
| 100 | PARAMS ((bfd *, asection *)); |
| 101 | |
| 102 | |
| 103 | /* Local helper functions. */ |
| 104 | |
| 105 | static bfd_boolean xtensa_elf_dynamic_symbol_p |
| 106 | PARAMS ((struct elf_link_hash_entry *, struct bfd_link_info *)); |
| 107 | static int property_table_compare |
| 108 | PARAMS ((const PTR, const PTR)); |
| 109 | static bfd_boolean elf_xtensa_in_literal_pool |
| 110 | PARAMS ((property_table_entry *, int, bfd_vma)); |
| 111 | static void elf_xtensa_make_sym_local |
| 112 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); |
| 113 | static bfd_boolean add_extra_plt_sections |
| 114 | PARAMS ((bfd *, int)); |
| 115 | static bfd_boolean elf_xtensa_fix_refcounts |
| 116 | PARAMS ((struct elf_link_hash_entry *, PTR)); |
| 117 | static bfd_boolean elf_xtensa_allocate_plt_size |
| 118 | PARAMS ((struct elf_link_hash_entry *, PTR)); |
| 119 | static bfd_boolean elf_xtensa_allocate_got_size |
| 120 | PARAMS ((struct elf_link_hash_entry *, PTR)); |
| 121 | static void elf_xtensa_allocate_local_got_size |
| 122 | PARAMS ((struct bfd_link_info *, asection *)); |
| 123 | static bfd_reloc_status_type elf_xtensa_do_reloc |
| 124 | PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_vma, bfd_byte *, |
| 125 | bfd_vma, bfd_boolean, char **)); |
| 126 | static char * vsprint_msg |
| 127 | VPARAMS ((const char *, const char *, int, ...)); |
| 128 | static char *build_encoding_error_message |
| 129 | PARAMS ((xtensa_opcode, xtensa_encode_result)); |
| 130 | static bfd_reloc_status_type bfd_elf_xtensa_reloc |
| 131 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); |
| 132 | static void do_fix_for_relocatable_link |
| 133 | PARAMS ((Elf_Internal_Rela *, bfd *, asection *)); |
| 134 | static void do_fix_for_final_link |
| 135 | PARAMS ((Elf_Internal_Rela *, asection *, bfd_vma *)); |
| 136 | static bfd_vma elf_xtensa_create_plt_entry |
| 137 | PARAMS ((bfd *, bfd *, unsigned)); |
| 138 | static int elf_xtensa_combine_prop_entries |
| 139 | PARAMS ((bfd *, asection *, asection *)); |
| 140 | static bfd_boolean elf_xtensa_discard_info_for_section |
| 141 | PARAMS ((bfd *, struct elf_reloc_cookie *, struct bfd_link_info *, |
| 142 | asection *)); |
| 143 | |
| 144 | /* Local functions to handle Xtensa configurability. */ |
| 145 | |
| 146 | static void init_call_opcodes |
| 147 | PARAMS ((void)); |
| 148 | static bfd_boolean is_indirect_call_opcode |
| 149 | PARAMS ((xtensa_opcode)); |
| 150 | static bfd_boolean is_direct_call_opcode |
| 151 | PARAMS ((xtensa_opcode)); |
| 152 | static bfd_boolean is_windowed_call_opcode |
| 153 | PARAMS ((xtensa_opcode)); |
| 154 | static xtensa_opcode get_l32r_opcode |
| 155 | PARAMS ((void)); |
| 156 | static bfd_vma l32r_offset |
| 157 | PARAMS ((bfd_vma, bfd_vma)); |
| 158 | static int get_relocation_opnd |
| 159 | PARAMS ((Elf_Internal_Rela *)); |
| 160 | static xtensa_opcode get_relocation_opcode |
| 161 | PARAMS ((asection *, bfd_byte *, Elf_Internal_Rela *)); |
| 162 | static bfd_boolean is_l32r_relocation |
| 163 | PARAMS ((asection *, bfd_byte *, Elf_Internal_Rela *)); |
| 164 | |
| 165 | /* Functions for link-time code simplifications. */ |
| 166 | |
| 167 | static bfd_reloc_status_type elf_xtensa_do_asm_simplify |
| 168 | PARAMS ((bfd_byte *, bfd_vma, bfd_vma)); |
| 169 | static bfd_reloc_status_type contract_asm_expansion |
| 170 | PARAMS ((bfd_byte *, bfd_vma, Elf_Internal_Rela *)); |
| 171 | static xtensa_opcode swap_callx_for_call_opcode |
| 172 | PARAMS ((xtensa_opcode)); |
| 173 | static xtensa_opcode get_expanded_call_opcode |
| 174 | PARAMS ((bfd_byte *, int)); |
| 175 | |
| 176 | /* Access to internal relocations, section contents and symbols. */ |
| 177 | |
| 178 | static Elf_Internal_Rela *retrieve_internal_relocs |
| 179 | PARAMS ((bfd *, asection *, bfd_boolean)); |
| 180 | static void pin_internal_relocs |
| 181 | PARAMS ((asection *, Elf_Internal_Rela *)); |
| 182 | static void release_internal_relocs |
| 183 | PARAMS ((asection *, Elf_Internal_Rela *)); |
| 184 | static bfd_byte *retrieve_contents |
| 185 | PARAMS ((bfd *, asection *, bfd_boolean)); |
| 186 | static void pin_contents |
| 187 | PARAMS ((asection *, bfd_byte *)); |
| 188 | static void release_contents |
| 189 | PARAMS ((asection *, bfd_byte *)); |
| 190 | static Elf_Internal_Sym *retrieve_local_syms |
| 191 | PARAMS ((bfd *)); |
| 192 | |
| 193 | /* Miscellaneous utility functions. */ |
| 194 | |
| 195 | static asection *elf_xtensa_get_plt_section |
| 196 | PARAMS ((bfd *, int)); |
| 197 | static asection *elf_xtensa_get_gotplt_section |
| 198 | PARAMS ((bfd *, int)); |
| 199 | static asection *get_elf_r_symndx_section |
| 200 | PARAMS ((bfd *, unsigned long)); |
| 201 | static struct elf_link_hash_entry *get_elf_r_symndx_hash_entry |
| 202 | PARAMS ((bfd *, unsigned long)); |
| 203 | static bfd_vma get_elf_r_symndx_offset |
| 204 | PARAMS ((bfd *, unsigned long)); |
| 205 | static bfd_boolean pcrel_reloc_fits |
| 206 | PARAMS ((xtensa_operand, bfd_vma, bfd_vma)); |
| 207 | static bfd_boolean xtensa_is_property_section |
| 208 | PARAMS ((asection *)); |
| 209 | static bfd_boolean xtensa_is_littable_section |
| 210 | PARAMS ((asection *)); |
| 211 | static bfd_boolean is_literal_section |
| 212 | PARAMS ((asection *)); |
| 213 | static int internal_reloc_compare |
| 214 | PARAMS ((const PTR, const PTR)); |
| 215 | static bfd_boolean get_is_linkonce_section |
| 216 | PARAMS ((bfd *, asection *)); |
| 217 | extern char *xtensa_get_property_section_name |
| 218 | PARAMS ((bfd *, asection *, const char *)); |
| 219 | |
| 220 | /* Other functions called directly by the linker. */ |
| 221 | |
| 222 | typedef void (*deps_callback_t) |
| 223 | PARAMS ((asection *, bfd_vma, asection *, bfd_vma, PTR)); |
| 224 | extern bfd_boolean xtensa_callback_required_dependence |
| 225 | PARAMS ((bfd *, asection *, struct bfd_link_info *, |
| 226 | deps_callback_t, PTR)); |
| 227 | |
| 228 | |
| 229 | typedef struct xtensa_relax_info_struct xtensa_relax_info; |
| 230 | |
| 231 | |
| 232 | /* Total count of PLT relocations seen during check_relocs. |
| 233 | The actual PLT code must be split into multiple sections and all |
| 234 | the sections have to be created before size_dynamic_sections, |
| 235 | where we figure out the exact number of PLT entries that will be |
| 236 | needed. It is OK if this count is an overestimate, e.g., some |
| 237 | relocations may be removed by GC. */ |
| 238 | |
| 239 | static int plt_reloc_count = 0; |
| 240 | |
| 241 | |
| 242 | /* When this is true, relocations may have been modified to refer to |
| 243 | symbols from other input files. The per-section list of "fix" |
| 244 | records needs to be checked when resolving relocations. */ |
| 245 | |
| 246 | static bfd_boolean relaxing_section = FALSE; |
| 247 | |
| 248 | \f |
| 249 | static reloc_howto_type elf_howto_table[] = |
| 250 | { |
| 251 | HOWTO (R_XTENSA_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont, |
| 252 | bfd_elf_xtensa_reloc, "R_XTENSA_NONE", |
| 253 | FALSE, 0x00000000, 0x00000000, FALSE), |
| 254 | HOWTO (R_XTENSA_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 255 | bfd_elf_xtensa_reloc, "R_XTENSA_32", |
| 256 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 257 | /* Replace a 32-bit value with a value from the runtime linker (only |
| 258 | used by linker-generated stub functions). The r_addend value is |
| 259 | special: 1 means to substitute a pointer to the runtime linker's |
| 260 | dynamic resolver function; 2 means to substitute the link map for |
| 261 | the shared object. */ |
| 262 | HOWTO (R_XTENSA_RTLD, 0, 2, 32, FALSE, 0, complain_overflow_dont, |
| 263 | NULL, "R_XTENSA_RTLD", |
| 264 | FALSE, 0x00000000, 0x00000000, FALSE), |
| 265 | HOWTO (R_XTENSA_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 266 | bfd_elf_generic_reloc, "R_XTENSA_GLOB_DAT", |
| 267 | FALSE, 0xffffffff, 0xffffffff, FALSE), |
| 268 | HOWTO (R_XTENSA_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 269 | bfd_elf_generic_reloc, "R_XTENSA_JMP_SLOT", |
| 270 | FALSE, 0xffffffff, 0xffffffff, FALSE), |
| 271 | HOWTO (R_XTENSA_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 272 | bfd_elf_generic_reloc, "R_XTENSA_RELATIVE", |
| 273 | FALSE, 0xffffffff, 0xffffffff, FALSE), |
| 274 | HOWTO (R_XTENSA_PLT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 275 | bfd_elf_xtensa_reloc, "R_XTENSA_PLT", |
| 276 | FALSE, 0xffffffff, 0xffffffff, FALSE), |
| 277 | EMPTY_HOWTO (7), |
| 278 | HOWTO (R_XTENSA_OP0, 0, 0, 0, TRUE, 0, complain_overflow_dont, |
| 279 | bfd_elf_xtensa_reloc, "R_XTENSA_OP0", |
| 280 | FALSE, 0x00000000, 0x00000000, TRUE), |
| 281 | HOWTO (R_XTENSA_OP1, 0, 0, 0, TRUE, 0, complain_overflow_dont, |
| 282 | bfd_elf_xtensa_reloc, "R_XTENSA_OP1", |
| 283 | FALSE, 0x00000000, 0x00000000, TRUE), |
| 284 | HOWTO (R_XTENSA_OP2, 0, 0, 0, TRUE, 0, complain_overflow_dont, |
| 285 | bfd_elf_xtensa_reloc, "R_XTENSA_OP2", |
| 286 | FALSE, 0x00000000, 0x00000000, TRUE), |
| 287 | /* Assembly auto-expansion. */ |
| 288 | HOWTO (R_XTENSA_ASM_EXPAND, 0, 0, 0, TRUE, 0, complain_overflow_dont, |
| 289 | bfd_elf_xtensa_reloc, "R_XTENSA_ASM_EXPAND", |
| 290 | FALSE, 0x00000000, 0x00000000, FALSE), |
| 291 | /* Relax assembly auto-expansion. */ |
| 292 | HOWTO (R_XTENSA_ASM_SIMPLIFY, 0, 0, 0, TRUE, 0, complain_overflow_dont, |
| 293 | bfd_elf_xtensa_reloc, "R_XTENSA_ASM_SIMPLIFY", |
| 294 | FALSE, 0x00000000, 0x00000000, TRUE), |
| 295 | EMPTY_HOWTO (13), |
| 296 | EMPTY_HOWTO (14), |
| 297 | /* GNU extension to record C++ vtable hierarchy. */ |
| 298 | HOWTO (R_XTENSA_GNU_VTINHERIT, 0, 2, 0, FALSE, 0, complain_overflow_dont, |
| 299 | NULL, "R_XTENSA_GNU_VTINHERIT", |
| 300 | FALSE, 0x00000000, 0x00000000, FALSE), |
| 301 | /* GNU extension to record C++ vtable member usage. */ |
| 302 | HOWTO (R_XTENSA_GNU_VTENTRY, 0, 2, 0, FALSE, 0, complain_overflow_dont, |
| 303 | _bfd_elf_rel_vtable_reloc_fn, "R_XTENSA_GNU_VTENTRY", |
| 304 | FALSE, 0x00000000, 0x00000000, FALSE) |
| 305 | }; |
| 306 | |
| 307 | #ifdef DEBUG_GEN_RELOC |
| 308 | #define TRACE(str) \ |
| 309 | fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str) |
| 310 | #else |
| 311 | #define TRACE(str) |
| 312 | #endif |
| 313 | |
| 314 | static reloc_howto_type * |
| 315 | elf_xtensa_reloc_type_lookup (abfd, code) |
| 316 | bfd *abfd ATTRIBUTE_UNUSED; |
| 317 | bfd_reloc_code_real_type code; |
| 318 | { |
| 319 | switch (code) |
| 320 | { |
| 321 | case BFD_RELOC_NONE: |
| 322 | TRACE ("BFD_RELOC_NONE"); |
| 323 | return &elf_howto_table[(unsigned) R_XTENSA_NONE ]; |
| 324 | |
| 325 | case BFD_RELOC_32: |
| 326 | TRACE ("BFD_RELOC_32"); |
| 327 | return &elf_howto_table[(unsigned) R_XTENSA_32 ]; |
| 328 | |
| 329 | case BFD_RELOC_XTENSA_RTLD: |
| 330 | TRACE ("BFD_RELOC_XTENSA_RTLD"); |
| 331 | return &elf_howto_table[(unsigned) R_XTENSA_RTLD ]; |
| 332 | |
| 333 | case BFD_RELOC_XTENSA_GLOB_DAT: |
| 334 | TRACE ("BFD_RELOC_XTENSA_GLOB_DAT"); |
| 335 | return &elf_howto_table[(unsigned) R_XTENSA_GLOB_DAT ]; |
| 336 | |
| 337 | case BFD_RELOC_XTENSA_JMP_SLOT: |
| 338 | TRACE ("BFD_RELOC_XTENSA_JMP_SLOT"); |
| 339 | return &elf_howto_table[(unsigned) R_XTENSA_JMP_SLOT ]; |
| 340 | |
| 341 | case BFD_RELOC_XTENSA_RELATIVE: |
| 342 | TRACE ("BFD_RELOC_XTENSA_RELATIVE"); |
| 343 | return &elf_howto_table[(unsigned) R_XTENSA_RELATIVE ]; |
| 344 | |
| 345 | case BFD_RELOC_XTENSA_PLT: |
| 346 | TRACE ("BFD_RELOC_XTENSA_PLT"); |
| 347 | return &elf_howto_table[(unsigned) R_XTENSA_PLT ]; |
| 348 | |
| 349 | case BFD_RELOC_XTENSA_OP0: |
| 350 | TRACE ("BFD_RELOC_XTENSA_OP0"); |
| 351 | return &elf_howto_table[(unsigned) R_XTENSA_OP0 ]; |
| 352 | |
| 353 | case BFD_RELOC_XTENSA_OP1: |
| 354 | TRACE ("BFD_RELOC_XTENSA_OP1"); |
| 355 | return &elf_howto_table[(unsigned) R_XTENSA_OP1 ]; |
| 356 | |
| 357 | case BFD_RELOC_XTENSA_OP2: |
| 358 | TRACE ("BFD_RELOC_XTENSA_OP2"); |
| 359 | return &elf_howto_table[(unsigned) R_XTENSA_OP2 ]; |
| 360 | |
| 361 | case BFD_RELOC_XTENSA_ASM_EXPAND: |
| 362 | TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND"); |
| 363 | return &elf_howto_table[(unsigned) R_XTENSA_ASM_EXPAND ]; |
| 364 | |
| 365 | case BFD_RELOC_XTENSA_ASM_SIMPLIFY: |
| 366 | TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY"); |
| 367 | return &elf_howto_table[(unsigned) R_XTENSA_ASM_SIMPLIFY ]; |
| 368 | |
| 369 | case BFD_RELOC_VTABLE_INHERIT: |
| 370 | TRACE ("BFD_RELOC_VTABLE_INHERIT"); |
| 371 | return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTINHERIT ]; |
| 372 | |
| 373 | case BFD_RELOC_VTABLE_ENTRY: |
| 374 | TRACE ("BFD_RELOC_VTABLE_ENTRY"); |
| 375 | return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTENTRY ]; |
| 376 | |
| 377 | default: |
| 378 | break; |
| 379 | } |
| 380 | |
| 381 | TRACE ("Unknown"); |
| 382 | return NULL; |
| 383 | } |
| 384 | |
| 385 | |
| 386 | /* Given an ELF "rela" relocation, find the corresponding howto and record |
| 387 | it in the BFD internal arelent representation of the relocation. */ |
| 388 | |
| 389 | static void |
| 390 | elf_xtensa_info_to_howto_rela (abfd, cache_ptr, dst) |
| 391 | bfd *abfd ATTRIBUTE_UNUSED; |
| 392 | arelent *cache_ptr; |
| 393 | Elf_Internal_Rela *dst; |
| 394 | { |
| 395 | unsigned int r_type = ELF32_R_TYPE (dst->r_info); |
| 396 | |
| 397 | BFD_ASSERT (r_type < (unsigned int) R_XTENSA_max); |
| 398 | cache_ptr->howto = &elf_howto_table[r_type]; |
| 399 | } |
| 400 | |
| 401 | \f |
| 402 | /* Functions for the Xtensa ELF linker. */ |
| 403 | |
| 404 | /* The name of the dynamic interpreter. This is put in the .interp |
| 405 | section. */ |
| 406 | |
| 407 | #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so" |
| 408 | |
| 409 | /* The size in bytes of an entry in the procedure linkage table. |
| 410 | (This does _not_ include the space for the literals associated with |
| 411 | the PLT entry.) */ |
| 412 | |
| 413 | #define PLT_ENTRY_SIZE 16 |
| 414 | |
| 415 | /* For _really_ large PLTs, we may need to alternate between literals |
| 416 | and code to keep the literals within the 256K range of the L32R |
| 417 | instructions in the code. It's unlikely that anyone would ever need |
| 418 | such a big PLT, but an arbitrary limit on the PLT size would be bad. |
| 419 | Thus, we split the PLT into chunks. Since there's very little |
| 420 | overhead (2 extra literals) for each chunk, the chunk size is kept |
| 421 | small so that the code for handling multiple chunks get used and |
| 422 | tested regularly. With 254 entries, there are 1K of literals for |
| 423 | each chunk, and that seems like a nice round number. */ |
| 424 | |
| 425 | #define PLT_ENTRIES_PER_CHUNK 254 |
| 426 | |
| 427 | /* PLT entries are actually used as stub functions for lazy symbol |
| 428 | resolution. Once the symbol is resolved, the stub function is never |
| 429 | invoked. Note: the 32-byte frame size used here cannot be changed |
| 430 | without a corresponding change in the runtime linker. */ |
| 431 | |
| 432 | static const bfd_byte elf_xtensa_be_plt_entry[PLT_ENTRY_SIZE] = |
| 433 | { |
| 434 | 0x6c, 0x10, 0x04, /* entry sp, 32 */ |
| 435 | 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */ |
| 436 | 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */ |
| 437 | 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */ |
| 438 | 0x0a, 0x80, 0x00, /* jx a8 */ |
| 439 | 0 /* unused */ |
| 440 | }; |
| 441 | |
| 442 | static const bfd_byte elf_xtensa_le_plt_entry[PLT_ENTRY_SIZE] = |
| 443 | { |
| 444 | 0x36, 0x41, 0x00, /* entry sp, 32 */ |
| 445 | 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */ |
| 446 | 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */ |
| 447 | 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */ |
| 448 | 0xa0, 0x08, 0x00, /* jx a8 */ |
| 449 | 0 /* unused */ |
| 450 | }; |
| 451 | |
| 452 | |
| 453 | static inline bfd_boolean |
| 454 | xtensa_elf_dynamic_symbol_p (h, info) |
| 455 | struct elf_link_hash_entry *h; |
| 456 | struct bfd_link_info *info; |
| 457 | { |
| 458 | /* Check if we should do dynamic things to this symbol. The |
| 459 | "ignore_protected" argument need not be set, because Xtensa code |
| 460 | does not require special handling of STV_PROTECTED to make function |
| 461 | pointer comparisons work properly. The PLT addresses are never |
| 462 | used for function pointers. */ |
| 463 | |
| 464 | return _bfd_elf_dynamic_symbol_p (h, info, 0); |
| 465 | } |
| 466 | |
| 467 | \f |
| 468 | static int |
| 469 | property_table_compare (ap, bp) |
| 470 | const PTR ap; |
| 471 | const PTR bp; |
| 472 | { |
| 473 | const property_table_entry *a = (const property_table_entry *) ap; |
| 474 | const property_table_entry *b = (const property_table_entry *) bp; |
| 475 | |
| 476 | /* Check if one entry overlaps with the other; this shouldn't happen |
| 477 | except when searching for a match. */ |
| 478 | if ((b->address >= a->address && b->address < (a->address + a->size)) |
| 479 | || (a->address >= b->address && a->address < (b->address + b->size))) |
| 480 | return 0; |
| 481 | |
| 482 | return (a->address - b->address); |
| 483 | } |
| 484 | |
| 485 | |
| 486 | /* Get the literal table or instruction table entries for the given |
| 487 | section. Sets TABLE_P and returns the number of entries. On error, |
| 488 | returns a negative value. */ |
| 489 | |
| 490 | int |
| 491 | xtensa_read_table_entries (abfd, section, table_p, sec_name) |
| 492 | bfd *abfd; |
| 493 | asection *section; |
| 494 | property_table_entry **table_p; |
| 495 | const char *sec_name; |
| 496 | { |
| 497 | asection *table_section; |
| 498 | char *table_section_name; |
| 499 | bfd_size_type table_size = 0; |
| 500 | bfd_byte *table_data; |
| 501 | property_table_entry *blocks; |
| 502 | int block_count; |
| 503 | bfd_size_type num_records; |
| 504 | Elf_Internal_Rela *internal_relocs; |
| 505 | |
| 506 | table_section_name = |
| 507 | xtensa_get_property_section_name (abfd, section, sec_name); |
| 508 | table_section = bfd_get_section_by_name (abfd, table_section_name); |
| 509 | if (table_section != NULL) |
| 510 | table_size = bfd_get_section_size_before_reloc (table_section); |
| 511 | |
| 512 | if (table_size == 0) |
| 513 | { |
| 514 | *table_p = NULL; |
| 515 | return 0; |
| 516 | } |
| 517 | |
| 518 | num_records = table_size / sizeof (property_table_entry); |
| 519 | table_data = retrieve_contents (abfd, table_section, TRUE); |
| 520 | blocks = (property_table_entry *) |
| 521 | bfd_malloc (num_records * sizeof (property_table_entry)); |
| 522 | block_count = 0; |
| 523 | |
| 524 | /* If the file has not yet been relocated, process the relocations |
| 525 | and sort out the table entries that apply to the specified section. */ |
| 526 | internal_relocs = retrieve_internal_relocs (abfd, table_section, TRUE); |
| 527 | if (internal_relocs) |
| 528 | { |
| 529 | unsigned i; |
| 530 | |
| 531 | for (i = 0; i < table_section->reloc_count; i++) |
| 532 | { |
| 533 | Elf_Internal_Rela *rel = &internal_relocs[i]; |
| 534 | unsigned long r_symndx; |
| 535 | |
| 536 | if (ELF32_R_TYPE (rel->r_info) == R_XTENSA_NONE) |
| 537 | continue; |
| 538 | |
| 539 | BFD_ASSERT (ELF32_R_TYPE (rel->r_info) == R_XTENSA_32); |
| 540 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 541 | |
| 542 | if (get_elf_r_symndx_section (abfd, r_symndx) == section) |
| 543 | { |
| 544 | bfd_vma sym_off = get_elf_r_symndx_offset (abfd, r_symndx); |
| 545 | blocks[block_count].address = |
| 546 | (section->vma + sym_off + rel->r_addend |
| 547 | + bfd_get_32 (abfd, table_data + rel->r_offset)); |
| 548 | blocks[block_count].size = |
| 549 | bfd_get_32 (abfd, table_data + rel->r_offset + 4); |
| 550 | block_count++; |
| 551 | } |
| 552 | } |
| 553 | } |
| 554 | else |
| 555 | { |
| 556 | /* No relocations. Presumably the file has been relocated |
| 557 | and the addresses are already in the table. */ |
| 558 | bfd_vma off; |
| 559 | |
| 560 | for (off = 0; off < table_size; off += sizeof (property_table_entry)) |
| 561 | { |
| 562 | bfd_vma address = bfd_get_32 (abfd, table_data + off); |
| 563 | |
| 564 | if (address >= section->vma |
| 565 | && address < ( section->vma + section->_raw_size)) |
| 566 | { |
| 567 | blocks[block_count].address = address; |
| 568 | blocks[block_count].size = |
| 569 | bfd_get_32 (abfd, table_data + off + 4); |
| 570 | block_count++; |
| 571 | } |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | release_contents (table_section, table_data); |
| 576 | release_internal_relocs (table_section, internal_relocs); |
| 577 | |
| 578 | if (block_count > 0) |
| 579 | { |
| 580 | /* Now sort them into address order for easy reference. */ |
| 581 | qsort (blocks, block_count, sizeof (property_table_entry), |
| 582 | property_table_compare); |
| 583 | } |
| 584 | |
| 585 | *table_p = blocks; |
| 586 | return block_count; |
| 587 | } |
| 588 | |
| 589 | |
| 590 | static bfd_boolean |
| 591 | elf_xtensa_in_literal_pool (lit_table, lit_table_size, addr) |
| 592 | property_table_entry *lit_table; |
| 593 | int lit_table_size; |
| 594 | bfd_vma addr; |
| 595 | { |
| 596 | property_table_entry entry; |
| 597 | |
| 598 | if (lit_table_size == 0) |
| 599 | return FALSE; |
| 600 | |
| 601 | entry.address = addr; |
| 602 | entry.size = 1; |
| 603 | |
| 604 | if (bsearch (&entry, lit_table, lit_table_size, |
| 605 | sizeof (property_table_entry), property_table_compare)) |
| 606 | return TRUE; |
| 607 | |
| 608 | return FALSE; |
| 609 | } |
| 610 | |
| 611 | \f |
| 612 | /* Look through the relocs for a section during the first phase, and |
| 613 | calculate needed space in the dynamic reloc sections. */ |
| 614 | |
| 615 | static bfd_boolean |
| 616 | elf_xtensa_check_relocs (abfd, info, sec, relocs) |
| 617 | bfd *abfd; |
| 618 | struct bfd_link_info *info; |
| 619 | asection *sec; |
| 620 | const Elf_Internal_Rela *relocs; |
| 621 | { |
| 622 | Elf_Internal_Shdr *symtab_hdr; |
| 623 | struct elf_link_hash_entry **sym_hashes; |
| 624 | const Elf_Internal_Rela *rel; |
| 625 | const Elf_Internal_Rela *rel_end; |
| 626 | property_table_entry *lit_table; |
| 627 | int ltblsize; |
| 628 | |
| 629 | if (info->relocatable) |
| 630 | return TRUE; |
| 631 | |
| 632 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 633 | sym_hashes = elf_sym_hashes (abfd); |
| 634 | |
| 635 | ltblsize = xtensa_read_table_entries (abfd, sec, &lit_table, |
| 636 | XTENSA_LIT_SEC_NAME); |
| 637 | if (ltblsize < 0) |
| 638 | return FALSE; |
| 639 | |
| 640 | rel_end = relocs + sec->reloc_count; |
| 641 | for (rel = relocs; rel < rel_end; rel++) |
| 642 | { |
| 643 | unsigned int r_type; |
| 644 | unsigned long r_symndx; |
| 645 | struct elf_link_hash_entry *h; |
| 646 | |
| 647 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 648 | r_type = ELF32_R_TYPE (rel->r_info); |
| 649 | |
| 650 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| 651 | { |
| 652 | (*_bfd_error_handler) (_("%s: bad symbol index: %d"), |
| 653 | bfd_archive_filename (abfd), |
| 654 | r_symndx); |
| 655 | return FALSE; |
| 656 | } |
| 657 | |
| 658 | if (r_symndx < symtab_hdr->sh_info) |
| 659 | h = NULL; |
| 660 | else |
| 661 | { |
| 662 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 663 | while (h->root.type == bfd_link_hash_indirect |
| 664 | || h->root.type == bfd_link_hash_warning) |
| 665 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 666 | } |
| 667 | |
| 668 | switch (r_type) |
| 669 | { |
| 670 | case R_XTENSA_32: |
| 671 | if (h == NULL) |
| 672 | goto local_literal; |
| 673 | |
| 674 | if ((sec->flags & SEC_ALLOC) != 0) |
| 675 | { |
| 676 | if ((sec->flags & SEC_READONLY) != 0 |
| 677 | && !elf_xtensa_in_literal_pool (lit_table, ltblsize, |
| 678 | sec->vma + rel->r_offset)) |
| 679 | h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; |
| 680 | |
| 681 | if (h->got.refcount <= 0) |
| 682 | h->got.refcount = 1; |
| 683 | else |
| 684 | h->got.refcount += 1; |
| 685 | } |
| 686 | break; |
| 687 | |
| 688 | case R_XTENSA_PLT: |
| 689 | /* If this relocation is against a local symbol, then it's |
| 690 | exactly the same as a normal local GOT entry. */ |
| 691 | if (h == NULL) |
| 692 | goto local_literal; |
| 693 | |
| 694 | if ((sec->flags & SEC_ALLOC) != 0) |
| 695 | { |
| 696 | if ((sec->flags & SEC_READONLY) != 0 |
| 697 | && !elf_xtensa_in_literal_pool (lit_table, ltblsize, |
| 698 | sec->vma + rel->r_offset)) |
| 699 | h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; |
| 700 | |
| 701 | if (h->plt.refcount <= 0) |
| 702 | { |
| 703 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
| 704 | h->plt.refcount = 1; |
| 705 | } |
| 706 | else |
| 707 | h->plt.refcount += 1; |
| 708 | |
| 709 | /* Keep track of the total PLT relocation count even if we |
| 710 | don't yet know whether the dynamic sections will be |
| 711 | created. */ |
| 712 | plt_reloc_count += 1; |
| 713 | |
| 714 | if (elf_hash_table (info)->dynamic_sections_created) |
| 715 | { |
| 716 | if (!add_extra_plt_sections (elf_hash_table (info)->dynobj, |
| 717 | plt_reloc_count)) |
| 718 | return FALSE; |
| 719 | } |
| 720 | } |
| 721 | break; |
| 722 | |
| 723 | local_literal: |
| 724 | if ((sec->flags & SEC_ALLOC) != 0) |
| 725 | { |
| 726 | bfd_signed_vma *local_got_refcounts; |
| 727 | |
| 728 | /* This is a global offset table entry for a local symbol. */ |
| 729 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 730 | if (local_got_refcounts == NULL) |
| 731 | { |
| 732 | bfd_size_type size; |
| 733 | |
| 734 | size = symtab_hdr->sh_info; |
| 735 | size *= sizeof (bfd_signed_vma); |
| 736 | local_got_refcounts = ((bfd_signed_vma *) |
| 737 | bfd_zalloc (abfd, size)); |
| 738 | if (local_got_refcounts == NULL) |
| 739 | return FALSE; |
| 740 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
| 741 | } |
| 742 | local_got_refcounts[r_symndx] += 1; |
| 743 | |
| 744 | /* If the relocation is not inside the GOT, the DF_TEXTREL |
| 745 | flag needs to be set. */ |
| 746 | if (info->shared |
| 747 | && (sec->flags & SEC_READONLY) != 0 |
| 748 | && !elf_xtensa_in_literal_pool (lit_table, ltblsize, |
| 749 | sec->vma + rel->r_offset)) |
| 750 | info->flags |= DF_TEXTREL; |
| 751 | } |
| 752 | break; |
| 753 | |
| 754 | case R_XTENSA_OP0: |
| 755 | case R_XTENSA_OP1: |
| 756 | case R_XTENSA_OP2: |
| 757 | case R_XTENSA_ASM_EXPAND: |
| 758 | case R_XTENSA_ASM_SIMPLIFY: |
| 759 | /* Nothing to do for these. */ |
| 760 | break; |
| 761 | |
| 762 | case R_XTENSA_GNU_VTINHERIT: |
| 763 | /* This relocation describes the C++ object vtable hierarchy. |
| 764 | Reconstruct it for later use during GC. */ |
| 765 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 766 | return FALSE; |
| 767 | break; |
| 768 | |
| 769 | case R_XTENSA_GNU_VTENTRY: |
| 770 | /* This relocation describes which C++ vtable entries are actually |
| 771 | used. Record for later use during GC. */ |
| 772 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 773 | return FALSE; |
| 774 | break; |
| 775 | |
| 776 | default: |
| 777 | break; |
| 778 | } |
| 779 | } |
| 780 | |
| 781 | free (lit_table); |
| 782 | return TRUE; |
| 783 | } |
| 784 | |
| 785 | |
| 786 | static void |
| 787 | elf_xtensa_hide_symbol (info, h, force_local) |
| 788 | struct bfd_link_info *info; |
| 789 | struct elf_link_hash_entry *h; |
| 790 | bfd_boolean force_local; |
| 791 | { |
| 792 | /* For a shared link, move the plt refcount to the got refcount to leave |
| 793 | space for RELATIVE relocs. */ |
| 794 | elf_xtensa_make_sym_local (info, h); |
| 795 | |
| 796 | _bfd_elf_link_hash_hide_symbol (info, h, force_local); |
| 797 | } |
| 798 | |
| 799 | |
| 800 | static void |
| 801 | elf_xtensa_copy_indirect_symbol (bed, dir, ind) |
| 802 | const struct elf_backend_data *bed; |
| 803 | struct elf_link_hash_entry *dir, *ind; |
| 804 | { |
| 805 | _bfd_elf_link_hash_copy_indirect (bed, dir, ind); |
| 806 | |
| 807 | /* The standard function doesn't copy the NEEDS_PLT flag. */ |
| 808 | dir->elf_link_hash_flags |= |
| 809 | (ind->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT); |
| 810 | } |
| 811 | |
| 812 | |
| 813 | /* Return the section that should be marked against GC for a given |
| 814 | relocation. */ |
| 815 | |
| 816 | static asection * |
| 817 | elf_xtensa_gc_mark_hook (sec, info, rel, h, sym) |
| 818 | asection *sec; |
| 819 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 820 | Elf_Internal_Rela *rel; |
| 821 | struct elf_link_hash_entry *h; |
| 822 | Elf_Internal_Sym *sym; |
| 823 | { |
| 824 | if (h != NULL) |
| 825 | { |
| 826 | switch (ELF32_R_TYPE (rel->r_info)) |
| 827 | { |
| 828 | case R_XTENSA_GNU_VTINHERIT: |
| 829 | case R_XTENSA_GNU_VTENTRY: |
| 830 | break; |
| 831 | |
| 832 | default: |
| 833 | switch (h->root.type) |
| 834 | { |
| 835 | case bfd_link_hash_defined: |
| 836 | case bfd_link_hash_defweak: |
| 837 | return h->root.u.def.section; |
| 838 | |
| 839 | case bfd_link_hash_common: |
| 840 | return h->root.u.c.p->section; |
| 841 | |
| 842 | default: |
| 843 | break; |
| 844 | } |
| 845 | } |
| 846 | } |
| 847 | else |
| 848 | return bfd_section_from_elf_index (sec->owner, sym->st_shndx); |
| 849 | |
| 850 | return NULL; |
| 851 | } |
| 852 | |
| 853 | /* Update the GOT & PLT entry reference counts |
| 854 | for the section being removed. */ |
| 855 | |
| 856 | static bfd_boolean |
| 857 | elf_xtensa_gc_sweep_hook (abfd, info, sec, relocs) |
| 858 | bfd *abfd; |
| 859 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 860 | asection *sec; |
| 861 | const Elf_Internal_Rela *relocs; |
| 862 | { |
| 863 | Elf_Internal_Shdr *symtab_hdr; |
| 864 | struct elf_link_hash_entry **sym_hashes; |
| 865 | bfd_signed_vma *local_got_refcounts; |
| 866 | const Elf_Internal_Rela *rel, *relend; |
| 867 | |
| 868 | if ((sec->flags & SEC_ALLOC) == 0) |
| 869 | return TRUE; |
| 870 | |
| 871 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 872 | sym_hashes = elf_sym_hashes (abfd); |
| 873 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 874 | |
| 875 | relend = relocs + sec->reloc_count; |
| 876 | for (rel = relocs; rel < relend; rel++) |
| 877 | { |
| 878 | unsigned long r_symndx; |
| 879 | unsigned int r_type; |
| 880 | struct elf_link_hash_entry *h = NULL; |
| 881 | |
| 882 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 883 | if (r_symndx >= symtab_hdr->sh_info) |
| 884 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 885 | |
| 886 | r_type = ELF32_R_TYPE (rel->r_info); |
| 887 | switch (r_type) |
| 888 | { |
| 889 | case R_XTENSA_32: |
| 890 | if (h == NULL) |
| 891 | goto local_literal; |
| 892 | if (h->got.refcount > 0) |
| 893 | h->got.refcount--; |
| 894 | break; |
| 895 | |
| 896 | case R_XTENSA_PLT: |
| 897 | if (h == NULL) |
| 898 | goto local_literal; |
| 899 | if (h->plt.refcount > 0) |
| 900 | h->plt.refcount--; |
| 901 | break; |
| 902 | |
| 903 | local_literal: |
| 904 | if (local_got_refcounts[r_symndx] > 0) |
| 905 | local_got_refcounts[r_symndx] -= 1; |
| 906 | break; |
| 907 | |
| 908 | default: |
| 909 | break; |
| 910 | } |
| 911 | } |
| 912 | |
| 913 | return TRUE; |
| 914 | } |
| 915 | |
| 916 | |
| 917 | /* Create all the dynamic sections. */ |
| 918 | |
| 919 | static bfd_boolean |
| 920 | elf_xtensa_create_dynamic_sections (dynobj, info) |
| 921 | bfd *dynobj; |
| 922 | struct bfd_link_info *info; |
| 923 | { |
| 924 | flagword flags, noalloc_flags; |
| 925 | asection *s; |
| 926 | |
| 927 | /* First do all the standard stuff. */ |
| 928 | if (! _bfd_elf_create_dynamic_sections (dynobj, info)) |
| 929 | return FALSE; |
| 930 | |
| 931 | /* Create any extra PLT sections in case check_relocs has already |
| 932 | been called on all the non-dynamic input files. */ |
| 933 | if (!add_extra_plt_sections (dynobj, plt_reloc_count)) |
| 934 | return FALSE; |
| 935 | |
| 936 | noalloc_flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY |
| 937 | | SEC_LINKER_CREATED | SEC_READONLY); |
| 938 | flags = noalloc_flags | SEC_ALLOC | SEC_LOAD; |
| 939 | |
| 940 | /* Mark the ".got.plt" section READONLY. */ |
| 941 | s = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 942 | if (s == NULL |
| 943 | || ! bfd_set_section_flags (dynobj, s, flags)) |
| 944 | return FALSE; |
| 945 | |
| 946 | /* Create ".rela.got". */ |
| 947 | s = bfd_make_section (dynobj, ".rela.got"); |
| 948 | if (s == NULL |
| 949 | || ! bfd_set_section_flags (dynobj, s, flags) |
| 950 | || ! bfd_set_section_alignment (dynobj, s, 2)) |
| 951 | return FALSE; |
| 952 | |
| 953 | /* Create ".got.loc" (literal tables for use by dynamic linker). */ |
| 954 | s = bfd_make_section (dynobj, ".got.loc"); |
| 955 | if (s == NULL |
| 956 | || ! bfd_set_section_flags (dynobj, s, flags) |
| 957 | || ! bfd_set_section_alignment (dynobj, s, 2)) |
| 958 | return FALSE; |
| 959 | |
| 960 | /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */ |
| 961 | s = bfd_make_section (dynobj, ".xt.lit.plt"); |
| 962 | if (s == NULL |
| 963 | || ! bfd_set_section_flags (dynobj, s, noalloc_flags) |
| 964 | || ! bfd_set_section_alignment (dynobj, s, 2)) |
| 965 | return FALSE; |
| 966 | |
| 967 | return TRUE; |
| 968 | } |
| 969 | |
| 970 | |
| 971 | static bfd_boolean |
| 972 | add_extra_plt_sections (dynobj, count) |
| 973 | bfd *dynobj; |
| 974 | int count; |
| 975 | { |
| 976 | int chunk; |
| 977 | |
| 978 | /* Iterate over all chunks except 0 which uses the standard ".plt" and |
| 979 | ".got.plt" sections. */ |
| 980 | for (chunk = count / PLT_ENTRIES_PER_CHUNK; chunk > 0; chunk--) |
| 981 | { |
| 982 | char *sname; |
| 983 | flagword flags; |
| 984 | asection *s; |
| 985 | |
| 986 | /* Stop when we find a section has already been created. */ |
| 987 | if (elf_xtensa_get_plt_section (dynobj, chunk)) |
| 988 | break; |
| 989 | |
| 990 | flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY |
| 991 | | SEC_LINKER_CREATED | SEC_READONLY); |
| 992 | |
| 993 | sname = (char *) bfd_malloc (10); |
| 994 | sprintf (sname, ".plt.%u", chunk); |
| 995 | s = bfd_make_section (dynobj, sname); |
| 996 | if (s == NULL |
| 997 | || ! bfd_set_section_flags (dynobj, s, flags | SEC_CODE) |
| 998 | || ! bfd_set_section_alignment (dynobj, s, 2)) |
| 999 | return FALSE; |
| 1000 | |
| 1001 | sname = (char *) bfd_malloc (14); |
| 1002 | sprintf (sname, ".got.plt.%u", chunk); |
| 1003 | s = bfd_make_section (dynobj, sname); |
| 1004 | if (s == NULL |
| 1005 | || ! bfd_set_section_flags (dynobj, s, flags) |
| 1006 | || ! bfd_set_section_alignment (dynobj, s, 2)) |
| 1007 | return FALSE; |
| 1008 | } |
| 1009 | |
| 1010 | return TRUE; |
| 1011 | } |
| 1012 | |
| 1013 | |
| 1014 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 1015 | regular object. The current definition is in some section of the |
| 1016 | dynamic object, but we're not including those sections. We have to |
| 1017 | change the definition to something the rest of the link can |
| 1018 | understand. */ |
| 1019 | |
| 1020 | static bfd_boolean |
| 1021 | elf_xtensa_adjust_dynamic_symbol (info, h) |
| 1022 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 1023 | struct elf_link_hash_entry *h; |
| 1024 | { |
| 1025 | /* If this is a weak symbol, and there is a real definition, the |
| 1026 | processor independent code will have arranged for us to see the |
| 1027 | real definition first, and we can just use the same value. */ |
| 1028 | if (h->weakdef != NULL) |
| 1029 | { |
| 1030 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined |
| 1031 | || h->weakdef->root.type == bfd_link_hash_defweak); |
| 1032 | h->root.u.def.section = h->weakdef->root.u.def.section; |
| 1033 | h->root.u.def.value = h->weakdef->root.u.def.value; |
| 1034 | return TRUE; |
| 1035 | } |
| 1036 | |
| 1037 | /* This is a reference to a symbol defined by a dynamic object. The |
| 1038 | reference must go through the GOT, so there's no need for COPY relocs, |
| 1039 | .dynbss, etc. */ |
| 1040 | |
| 1041 | return TRUE; |
| 1042 | } |
| 1043 | |
| 1044 | |
| 1045 | static void |
| 1046 | elf_xtensa_make_sym_local (info, h) |
| 1047 | struct bfd_link_info *info; |
| 1048 | struct elf_link_hash_entry *h; |
| 1049 | { |
| 1050 | if (info->shared) |
| 1051 | { |
| 1052 | if (h->plt.refcount > 0) |
| 1053 | { |
| 1054 | /* Will use RELATIVE relocs instead of JMP_SLOT relocs. */ |
| 1055 | if (h->got.refcount < 0) |
| 1056 | h->got.refcount = 0; |
| 1057 | h->got.refcount += h->plt.refcount; |
| 1058 | h->plt.refcount = 0; |
| 1059 | } |
| 1060 | } |
| 1061 | else |
| 1062 | { |
| 1063 | /* Don't need any dynamic relocations at all. */ |
| 1064 | h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; |
| 1065 | h->plt.refcount = 0; |
| 1066 | h->got.refcount = 0; |
| 1067 | } |
| 1068 | } |
| 1069 | |
| 1070 | |
| 1071 | static bfd_boolean |
| 1072 | elf_xtensa_fix_refcounts (h, arg) |
| 1073 | struct elf_link_hash_entry *h; |
| 1074 | PTR arg; |
| 1075 | { |
| 1076 | struct bfd_link_info *info = (struct bfd_link_info *) arg; |
| 1077 | |
| 1078 | if (h->root.type == bfd_link_hash_warning) |
| 1079 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1080 | |
| 1081 | if (! xtensa_elf_dynamic_symbol_p (h, info)) |
| 1082 | elf_xtensa_make_sym_local (info, h); |
| 1083 | |
| 1084 | /* If the symbol has a relocation outside the GOT, set the |
| 1085 | DF_TEXTREL flag. */ |
| 1086 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) != 0) |
| 1087 | info->flags |= DF_TEXTREL; |
| 1088 | |
| 1089 | return TRUE; |
| 1090 | } |
| 1091 | |
| 1092 | |
| 1093 | static bfd_boolean |
| 1094 | elf_xtensa_allocate_plt_size (h, arg) |
| 1095 | struct elf_link_hash_entry *h; |
| 1096 | PTR arg; |
| 1097 | { |
| 1098 | asection *srelplt = (asection *) arg; |
| 1099 | |
| 1100 | if (h->root.type == bfd_link_hash_warning) |
| 1101 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1102 | |
| 1103 | if (h->plt.refcount > 0) |
| 1104 | srelplt->_raw_size += (h->plt.refcount * sizeof (Elf32_External_Rela)); |
| 1105 | |
| 1106 | return TRUE; |
| 1107 | } |
| 1108 | |
| 1109 | |
| 1110 | static bfd_boolean |
| 1111 | elf_xtensa_allocate_got_size (h, arg) |
| 1112 | struct elf_link_hash_entry *h; |
| 1113 | PTR arg; |
| 1114 | { |
| 1115 | asection *srelgot = (asection *) arg; |
| 1116 | |
| 1117 | if (h->root.type == bfd_link_hash_warning) |
| 1118 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1119 | |
| 1120 | if (h->got.refcount > 0) |
| 1121 | srelgot->_raw_size += (h->got.refcount * sizeof (Elf32_External_Rela)); |
| 1122 | |
| 1123 | return TRUE; |
| 1124 | } |
| 1125 | |
| 1126 | |
| 1127 | static void |
| 1128 | elf_xtensa_allocate_local_got_size (info, srelgot) |
| 1129 | struct bfd_link_info *info; |
| 1130 | asection *srelgot; |
| 1131 | { |
| 1132 | bfd *i; |
| 1133 | |
| 1134 | for (i = info->input_bfds; i; i = i->link_next) |
| 1135 | { |
| 1136 | bfd_signed_vma *local_got_refcounts; |
| 1137 | bfd_size_type j, cnt; |
| 1138 | Elf_Internal_Shdr *symtab_hdr; |
| 1139 | |
| 1140 | local_got_refcounts = elf_local_got_refcounts (i); |
| 1141 | if (!local_got_refcounts) |
| 1142 | continue; |
| 1143 | |
| 1144 | symtab_hdr = &elf_tdata (i)->symtab_hdr; |
| 1145 | cnt = symtab_hdr->sh_info; |
| 1146 | |
| 1147 | for (j = 0; j < cnt; ++j) |
| 1148 | { |
| 1149 | if (local_got_refcounts[j] > 0) |
| 1150 | srelgot->_raw_size += (local_got_refcounts[j] |
| 1151 | * sizeof (Elf32_External_Rela)); |
| 1152 | } |
| 1153 | } |
| 1154 | } |
| 1155 | |
| 1156 | |
| 1157 | /* Set the sizes of the dynamic sections. */ |
| 1158 | |
| 1159 | static bfd_boolean |
| 1160 | elf_xtensa_size_dynamic_sections (output_bfd, info) |
| 1161 | bfd *output_bfd ATTRIBUTE_UNUSED; |
| 1162 | struct bfd_link_info *info; |
| 1163 | { |
| 1164 | bfd *dynobj, *abfd; |
| 1165 | asection *s, *srelplt, *splt, *sgotplt, *srelgot, *spltlittbl, *sgotloc; |
| 1166 | bfd_boolean relplt, relgot; |
| 1167 | int plt_entries, plt_chunks, chunk; |
| 1168 | |
| 1169 | plt_entries = 0; |
| 1170 | plt_chunks = 0; |
| 1171 | srelgot = 0; |
| 1172 | |
| 1173 | dynobj = elf_hash_table (info)->dynobj; |
| 1174 | if (dynobj == NULL) |
| 1175 | abort (); |
| 1176 | |
| 1177 | if (elf_hash_table (info)->dynamic_sections_created) |
| 1178 | { |
| 1179 | /* Set the contents of the .interp section to the interpreter. */ |
| 1180 | if (! info->shared) |
| 1181 | { |
| 1182 | s = bfd_get_section_by_name (dynobj, ".interp"); |
| 1183 | if (s == NULL) |
| 1184 | abort (); |
| 1185 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; |
| 1186 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| 1187 | } |
| 1188 | |
| 1189 | /* Allocate room for one word in ".got". */ |
| 1190 | s = bfd_get_section_by_name (dynobj, ".got"); |
| 1191 | if (s == NULL) |
| 1192 | abort (); |
| 1193 | s->_raw_size = 4; |
| 1194 | |
| 1195 | /* Adjust refcounts for symbols that we now know are not "dynamic". */ |
| 1196 | elf_link_hash_traverse (elf_hash_table (info), |
| 1197 | elf_xtensa_fix_refcounts, |
| 1198 | (PTR) info); |
| 1199 | |
| 1200 | /* Allocate space in ".rela.got" for literals that reference |
| 1201 | global symbols. */ |
| 1202 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); |
| 1203 | if (srelgot == NULL) |
| 1204 | abort (); |
| 1205 | elf_link_hash_traverse (elf_hash_table (info), |
| 1206 | elf_xtensa_allocate_got_size, |
| 1207 | (PTR) srelgot); |
| 1208 | |
| 1209 | /* If we are generating a shared object, we also need space in |
| 1210 | ".rela.got" for R_XTENSA_RELATIVE relocs for literals that |
| 1211 | reference local symbols. */ |
| 1212 | if (info->shared) |
| 1213 | elf_xtensa_allocate_local_got_size (info, srelgot); |
| 1214 | |
| 1215 | /* Allocate space in ".rela.plt" for literals that have PLT entries. */ |
| 1216 | srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); |
| 1217 | if (srelplt == NULL) |
| 1218 | abort (); |
| 1219 | elf_link_hash_traverse (elf_hash_table (info), |
| 1220 | elf_xtensa_allocate_plt_size, |
| 1221 | (PTR) srelplt); |
| 1222 | |
| 1223 | /* Allocate space in ".plt" to match the size of ".rela.plt". For |
| 1224 | each PLT entry, we need the PLT code plus a 4-byte literal. |
| 1225 | For each chunk of ".plt", we also need two more 4-byte |
| 1226 | literals, two corresponding entries in ".rela.got", and an |
| 1227 | 8-byte entry in ".xt.lit.plt". */ |
| 1228 | spltlittbl = bfd_get_section_by_name (dynobj, ".xt.lit.plt"); |
| 1229 | if (spltlittbl == NULL) |
| 1230 | abort (); |
| 1231 | |
| 1232 | plt_entries = srelplt->_raw_size / sizeof (Elf32_External_Rela); |
| 1233 | plt_chunks = |
| 1234 | (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK; |
| 1235 | |
| 1236 | /* Iterate over all the PLT chunks, including any extra sections |
| 1237 | created earlier because the initial count of PLT relocations |
| 1238 | was an overestimate. */ |
| 1239 | for (chunk = 0; |
| 1240 | (splt = elf_xtensa_get_plt_section (dynobj, chunk)) != NULL; |
| 1241 | chunk++) |
| 1242 | { |
| 1243 | int chunk_entries; |
| 1244 | |
| 1245 | sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk); |
| 1246 | if (sgotplt == NULL) |
| 1247 | abort (); |
| 1248 | |
| 1249 | if (chunk < plt_chunks - 1) |
| 1250 | chunk_entries = PLT_ENTRIES_PER_CHUNK; |
| 1251 | else if (chunk == plt_chunks - 1) |
| 1252 | chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK); |
| 1253 | else |
| 1254 | chunk_entries = 0; |
| 1255 | |
| 1256 | if (chunk_entries != 0) |
| 1257 | { |
| 1258 | sgotplt->_raw_size = 4 * (chunk_entries + 2); |
| 1259 | splt->_raw_size = PLT_ENTRY_SIZE * chunk_entries; |
| 1260 | srelgot->_raw_size += 2 * sizeof (Elf32_External_Rela); |
| 1261 | spltlittbl->_raw_size += 8; |
| 1262 | } |
| 1263 | else |
| 1264 | { |
| 1265 | sgotplt->_raw_size = 0; |
| 1266 | splt->_raw_size = 0; |
| 1267 | } |
| 1268 | } |
| 1269 | |
| 1270 | /* Allocate space in ".got.loc" to match the total size of all the |
| 1271 | literal tables. */ |
| 1272 | sgotloc = bfd_get_section_by_name (dynobj, ".got.loc"); |
| 1273 | if (sgotloc == NULL) |
| 1274 | abort (); |
| 1275 | sgotloc->_raw_size = spltlittbl->_raw_size; |
| 1276 | for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next) |
| 1277 | { |
| 1278 | if (abfd->flags & DYNAMIC) |
| 1279 | continue; |
| 1280 | for (s = abfd->sections; s != NULL; s = s->next) |
| 1281 | { |
| 1282 | if (! elf_discarded_section (s) |
| 1283 | && xtensa_is_littable_section (s) |
| 1284 | && s != spltlittbl) |
| 1285 | sgotloc->_raw_size += s->_raw_size; |
| 1286 | } |
| 1287 | } |
| 1288 | } |
| 1289 | |
| 1290 | /* Allocate memory for dynamic sections. */ |
| 1291 | relplt = FALSE; |
| 1292 | relgot = FALSE; |
| 1293 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 1294 | { |
| 1295 | const char *name; |
| 1296 | bfd_boolean strip; |
| 1297 | |
| 1298 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 1299 | continue; |
| 1300 | |
| 1301 | /* It's OK to base decisions on the section name, because none |
| 1302 | of the dynobj section names depend upon the input files. */ |
| 1303 | name = bfd_get_section_name (dynobj, s); |
| 1304 | |
| 1305 | strip = FALSE; |
| 1306 | |
| 1307 | if (strncmp (name, ".rela", 5) == 0) |
| 1308 | { |
| 1309 | if (strcmp (name, ".rela.plt") == 0) |
| 1310 | relplt = TRUE; |
| 1311 | else if (strcmp (name, ".rela.got") == 0) |
| 1312 | relgot = TRUE; |
| 1313 | |
| 1314 | /* We use the reloc_count field as a counter if we need |
| 1315 | to copy relocs into the output file. */ |
| 1316 | s->reloc_count = 0; |
| 1317 | } |
| 1318 | else if (strncmp (name, ".plt.", 5) == 0 |
| 1319 | || strncmp (name, ".got.plt.", 9) == 0) |
| 1320 | { |
| 1321 | if (s->_raw_size == 0) |
| 1322 | { |
| 1323 | /* If we don't need this section, strip it from the output |
| 1324 | file. We must create the ".plt*" and ".got.plt*" |
| 1325 | sections in create_dynamic_sections and/or check_relocs |
| 1326 | based on a conservative estimate of the PLT relocation |
| 1327 | count, because the sections must be created before the |
| 1328 | linker maps input sections to output sections. The |
| 1329 | linker does that before size_dynamic_sections, where we |
| 1330 | compute the exact size of the PLT, so there may be more |
| 1331 | of these sections than are actually needed. */ |
| 1332 | strip = TRUE; |
| 1333 | } |
| 1334 | } |
| 1335 | else if (strcmp (name, ".got") != 0 |
| 1336 | && strcmp (name, ".plt") != 0 |
| 1337 | && strcmp (name, ".got.plt") != 0 |
| 1338 | && strcmp (name, ".xt.lit.plt") != 0 |
| 1339 | && strcmp (name, ".got.loc") != 0) |
| 1340 | { |
| 1341 | /* It's not one of our sections, so don't allocate space. */ |
| 1342 | continue; |
| 1343 | } |
| 1344 | |
| 1345 | if (strip) |
| 1346 | _bfd_strip_section_from_output (info, s); |
| 1347 | else |
| 1348 | { |
| 1349 | /* Allocate memory for the section contents. */ |
| 1350 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); |
| 1351 | if (s->contents == NULL && s->_raw_size != 0) |
| 1352 | return FALSE; |
| 1353 | } |
| 1354 | } |
| 1355 | |
| 1356 | if (elf_hash_table (info)->dynamic_sections_created) |
| 1357 | { |
| 1358 | /* Add the special XTENSA_RTLD relocations now. The offsets won't be |
| 1359 | known until finish_dynamic_sections, but we need to get the relocs |
| 1360 | in place before they are sorted. */ |
| 1361 | if (srelgot == NULL) |
| 1362 | abort (); |
| 1363 | for (chunk = 0; chunk < plt_chunks; chunk++) |
| 1364 | { |
| 1365 | Elf_Internal_Rela irela; |
| 1366 | bfd_byte *loc; |
| 1367 | |
| 1368 | irela.r_offset = 0; |
| 1369 | irela.r_info = ELF32_R_INFO (0, R_XTENSA_RTLD); |
| 1370 | irela.r_addend = 0; |
| 1371 | |
| 1372 | loc = (srelgot->contents |
| 1373 | + srelgot->reloc_count * sizeof (Elf32_External_Rela)); |
| 1374 | bfd_elf32_swap_reloca_out (output_bfd, &irela, loc); |
| 1375 | bfd_elf32_swap_reloca_out (output_bfd, &irela, |
| 1376 | loc + sizeof (Elf32_External_Rela)); |
| 1377 | srelgot->reloc_count += 2; |
| 1378 | } |
| 1379 | |
| 1380 | /* Add some entries to the .dynamic section. We fill in the |
| 1381 | values later, in elf_xtensa_finish_dynamic_sections, but we |
| 1382 | must add the entries now so that we get the correct size for |
| 1383 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 1384 | dynamic linker and used by the debugger. */ |
| 1385 | #define add_dynamic_entry(TAG, VAL) \ |
| 1386 | bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL)) |
| 1387 | |
| 1388 | if (! info->shared) |
| 1389 | { |
| 1390 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
| 1391 | return FALSE; |
| 1392 | } |
| 1393 | |
| 1394 | if (relplt) |
| 1395 | { |
| 1396 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
| 1397 | || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| 1398 | || !add_dynamic_entry (DT_PLTREL, DT_RELA) |
| 1399 | || !add_dynamic_entry (DT_JMPREL, 0)) |
| 1400 | return FALSE; |
| 1401 | } |
| 1402 | |
| 1403 | if (relgot) |
| 1404 | { |
| 1405 | if (!add_dynamic_entry (DT_RELA, 0) |
| 1406 | || !add_dynamic_entry (DT_RELASZ, 0) |
| 1407 | || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) |
| 1408 | return FALSE; |
| 1409 | } |
| 1410 | |
| 1411 | if ((info->flags & DF_TEXTREL) != 0) |
| 1412 | { |
| 1413 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| 1414 | return FALSE; |
| 1415 | } |
| 1416 | |
| 1417 | if (!add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF, 0) |
| 1418 | || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ, 0)) |
| 1419 | return FALSE; |
| 1420 | } |
| 1421 | #undef add_dynamic_entry |
| 1422 | |
| 1423 | return TRUE; |
| 1424 | } |
| 1425 | |
| 1426 | \f |
| 1427 | /* Remove any PT_LOAD segments with no allocated sections. Prior to |
| 1428 | binutils 2.13, this function used to remove the non-SEC_ALLOC |
| 1429 | sections from PT_LOAD segments, but that task has now been moved |
| 1430 | into elf.c. We still need this function to remove any empty |
| 1431 | segments that result, but there's nothing Xtensa-specific about |
| 1432 | this and it probably ought to be moved into elf.c as well. */ |
| 1433 | |
| 1434 | static bfd_boolean |
| 1435 | elf_xtensa_modify_segment_map (abfd) |
| 1436 | bfd *abfd; |
| 1437 | { |
| 1438 | struct elf_segment_map **m_p; |
| 1439 | |
| 1440 | m_p = &elf_tdata (abfd)->segment_map; |
| 1441 | while (*m_p != NULL) |
| 1442 | { |
| 1443 | if ((*m_p)->p_type == PT_LOAD && (*m_p)->count == 0) |
| 1444 | *m_p = (*m_p)->next; |
| 1445 | else |
| 1446 | m_p = &(*m_p)->next; |
| 1447 | } |
| 1448 | return TRUE; |
| 1449 | } |
| 1450 | |
| 1451 | \f |
| 1452 | /* Perform the specified relocation. The instruction at (contents + address) |
| 1453 | is modified to set one operand to represent the value in "relocation". The |
| 1454 | operand position is determined by the relocation type recorded in the |
| 1455 | howto. */ |
| 1456 | |
| 1457 | #define CALL_SEGMENT_BITS (30) |
| 1458 | #define CALL_SEGMENT_SIZE (1<<CALL_SEGMENT_BITS) |
| 1459 | |
| 1460 | static bfd_reloc_status_type |
| 1461 | elf_xtensa_do_reloc (howto, abfd, input_section, relocation, |
| 1462 | contents, address, is_weak_undef, error_message) |
| 1463 | reloc_howto_type *howto; |
| 1464 | bfd *abfd; |
| 1465 | asection *input_section; |
| 1466 | bfd_vma relocation; |
| 1467 | bfd_byte *contents; |
| 1468 | bfd_vma address; |
| 1469 | bfd_boolean is_weak_undef; |
| 1470 | char **error_message; |
| 1471 | { |
| 1472 | xtensa_opcode opcode; |
| 1473 | xtensa_operand operand; |
| 1474 | xtensa_encode_result encode_result; |
| 1475 | xtensa_isa isa = xtensa_default_isa; |
| 1476 | xtensa_insnbuf ibuff; |
| 1477 | bfd_vma self_address; |
| 1478 | int opnd; |
| 1479 | uint32 newval; |
| 1480 | |
| 1481 | switch (howto->type) |
| 1482 | { |
| 1483 | case R_XTENSA_NONE: |
| 1484 | return bfd_reloc_ok; |
| 1485 | |
| 1486 | case R_XTENSA_ASM_EXPAND: |
| 1487 | if (!is_weak_undef) |
| 1488 | { |
| 1489 | /* Check for windowed CALL across a 1GB boundary. */ |
| 1490 | xtensa_opcode opcode = |
| 1491 | get_expanded_call_opcode (contents + address, |
| 1492 | input_section->_raw_size - address); |
| 1493 | if (is_windowed_call_opcode (opcode)) |
| 1494 | { |
| 1495 | self_address = (input_section->output_section->vma |
| 1496 | + input_section->output_offset |
| 1497 | + address); |
| 1498 | if ((self_address >> CALL_SEGMENT_BITS) != |
| 1499 | (relocation >> CALL_SEGMENT_BITS)) |
| 1500 | { |
| 1501 | *error_message = "windowed longcall crosses 1GB boundary; " |
| 1502 | "return may fail"; |
| 1503 | return bfd_reloc_dangerous; |
| 1504 | } |
| 1505 | } |
| 1506 | } |
| 1507 | return bfd_reloc_ok; |
| 1508 | |
| 1509 | case R_XTENSA_ASM_SIMPLIFY: |
| 1510 | { |
| 1511 | /* Convert the L32R/CALLX to CALL. */ |
| 1512 | bfd_reloc_status_type retval = |
| 1513 | elf_xtensa_do_asm_simplify (contents, address, |
| 1514 | input_section->_raw_size); |
| 1515 | if (retval != bfd_reloc_ok) |
| 1516 | return retval; |
| 1517 | |
| 1518 | /* The CALL needs to be relocated. Continue below for that part. */ |
| 1519 | address += 3; |
| 1520 | howto = &elf_howto_table[(unsigned) R_XTENSA_OP0 ]; |
| 1521 | } |
| 1522 | break; |
| 1523 | |
| 1524 | case R_XTENSA_32: |
| 1525 | case R_XTENSA_PLT: |
| 1526 | { |
| 1527 | bfd_vma x; |
| 1528 | x = bfd_get_32 (abfd, contents + address); |
| 1529 | x = x + relocation; |
| 1530 | bfd_put_32 (abfd, x, contents + address); |
| 1531 | } |
| 1532 | return bfd_reloc_ok; |
| 1533 | } |
| 1534 | |
| 1535 | /* Read the instruction into a buffer and decode the opcode. */ |
| 1536 | ibuff = xtensa_insnbuf_alloc (isa); |
| 1537 | xtensa_insnbuf_from_chars (isa, ibuff, contents + address); |
| 1538 | opcode = xtensa_decode_insn (isa, ibuff); |
| 1539 | |
| 1540 | /* Determine which operand is being relocated. */ |
| 1541 | if (opcode == XTENSA_UNDEFINED) |
| 1542 | { |
| 1543 | *error_message = "cannot decode instruction"; |
| 1544 | return bfd_reloc_dangerous; |
| 1545 | } |
| 1546 | |
| 1547 | if (howto->type < R_XTENSA_OP0 || howto->type > R_XTENSA_OP2) |
| 1548 | { |
| 1549 | *error_message = "unexpected relocation"; |
| 1550 | return bfd_reloc_dangerous; |
| 1551 | } |
| 1552 | |
| 1553 | opnd = howto->type - R_XTENSA_OP0; |
| 1554 | |
| 1555 | /* Calculate the PC address for this instruction. */ |
| 1556 | if (!howto->pc_relative) |
| 1557 | { |
| 1558 | *error_message = "expected PC-relative relocation"; |
| 1559 | return bfd_reloc_dangerous; |
| 1560 | } |
| 1561 | |
| 1562 | self_address = (input_section->output_section->vma |
| 1563 | + input_section->output_offset |
| 1564 | + address); |
| 1565 | |
| 1566 | /* Apply the relocation. */ |
| 1567 | operand = xtensa_get_operand (isa, opcode, opnd); |
| 1568 | newval = xtensa_operand_do_reloc (operand, relocation, self_address); |
| 1569 | encode_result = xtensa_operand_encode (operand, &newval); |
| 1570 | xtensa_operand_set_field (operand, ibuff, newval); |
| 1571 | |
| 1572 | /* Write the modified instruction back out of the buffer. */ |
| 1573 | xtensa_insnbuf_to_chars (isa, ibuff, contents + address); |
| 1574 | free (ibuff); |
| 1575 | |
| 1576 | if (encode_result != xtensa_encode_result_ok) |
| 1577 | { |
| 1578 | char *message = build_encoding_error_message (opcode, encode_result); |
| 1579 | *error_message = message; |
| 1580 | return bfd_reloc_dangerous; |
| 1581 | } |
| 1582 | |
| 1583 | /* Final check for call. */ |
| 1584 | if (is_direct_call_opcode (opcode) |
| 1585 | && is_windowed_call_opcode (opcode)) |
| 1586 | { |
| 1587 | if ((self_address >> CALL_SEGMENT_BITS) != |
| 1588 | (relocation >> CALL_SEGMENT_BITS)) |
| 1589 | { |
| 1590 | *error_message = "windowed call crosses 1GB boundary; " |
| 1591 | "return may fail"; |
| 1592 | return bfd_reloc_dangerous; |
| 1593 | } |
| 1594 | } |
| 1595 | |
| 1596 | return bfd_reloc_ok; |
| 1597 | } |
| 1598 | |
| 1599 | |
| 1600 | static char * |
| 1601 | vsprint_msg VPARAMS ((const char *origmsg, const char *fmt, int arglen, ...)) |
| 1602 | { |
| 1603 | /* To reduce the size of the memory leak, |
| 1604 | we only use a single message buffer. */ |
| 1605 | static bfd_size_type alloc_size = 0; |
| 1606 | static char *message = NULL; |
| 1607 | bfd_size_type orig_len, len = 0; |
| 1608 | bfd_boolean is_append; |
| 1609 | |
| 1610 | VA_OPEN (ap, arglen); |
| 1611 | VA_FIXEDARG (ap, const char *, origmsg); |
| 1612 | |
| 1613 | is_append = (origmsg == message); |
| 1614 | |
| 1615 | orig_len = strlen (origmsg); |
| 1616 | len = orig_len + strlen (fmt) + arglen + 20; |
| 1617 | if (len > alloc_size) |
| 1618 | { |
| 1619 | message = (char *) bfd_realloc (message, len); |
| 1620 | alloc_size = len; |
| 1621 | } |
| 1622 | if (!is_append) |
| 1623 | memcpy (message, origmsg, orig_len); |
| 1624 | vsprintf (message + orig_len, fmt, ap); |
| 1625 | VA_CLOSE (ap); |
| 1626 | return message; |
| 1627 | } |
| 1628 | |
| 1629 | |
| 1630 | static char * |
| 1631 | build_encoding_error_message (opcode, encode_result) |
| 1632 | xtensa_opcode opcode; |
| 1633 | xtensa_encode_result encode_result; |
| 1634 | { |
| 1635 | const char *opname = xtensa_opcode_name (xtensa_default_isa, opcode); |
| 1636 | const char *msg = NULL; |
| 1637 | |
| 1638 | switch (encode_result) |
| 1639 | { |
| 1640 | case xtensa_encode_result_ok: |
| 1641 | msg = "unexpected valid encoding"; |
| 1642 | break; |
| 1643 | case xtensa_encode_result_align: |
| 1644 | msg = "misaligned encoding"; |
| 1645 | break; |
| 1646 | case xtensa_encode_result_not_in_table: |
| 1647 | msg = "encoding not in lookup table"; |
| 1648 | break; |
| 1649 | case xtensa_encode_result_too_low: |
| 1650 | msg = "encoding out of range: too low"; |
| 1651 | break; |
| 1652 | case xtensa_encode_result_too_high: |
| 1653 | msg = "encoding out of range: too high"; |
| 1654 | break; |
| 1655 | case xtensa_encode_result_not_ok: |
| 1656 | default: |
| 1657 | msg = "could not encode"; |
| 1658 | break; |
| 1659 | } |
| 1660 | |
| 1661 | if (is_direct_call_opcode (opcode) |
| 1662 | && (encode_result == xtensa_encode_result_too_low |
| 1663 | || encode_result == xtensa_encode_result_too_high)) |
| 1664 | |
| 1665 | msg = "direct call out of range"; |
| 1666 | |
| 1667 | else if (opcode == get_l32r_opcode ()) |
| 1668 | { |
| 1669 | /* L32Rs have the strange interaction with encoding in that they |
| 1670 | have an unsigned immediate field, so libisa returns "too high" |
| 1671 | when the absolute value is out of range and never returns "too |
| 1672 | low", but I leave the "too low" message in case anything |
| 1673 | changes. */ |
| 1674 | if (encode_result == xtensa_encode_result_too_low) |
| 1675 | msg = "literal out of range"; |
| 1676 | else if (encode_result == xtensa_encode_result_too_high) |
| 1677 | msg = "literal placed after use"; |
| 1678 | } |
| 1679 | |
| 1680 | return vsprint_msg (opname, ": %s", strlen (msg) + 2, msg); |
| 1681 | } |
| 1682 | |
| 1683 | |
| 1684 | /* This function is registered as the "special_function" in the |
| 1685 | Xtensa howto for handling simplify operations. |
| 1686 | bfd_perform_relocation / bfd_install_relocation use it to |
| 1687 | perform (install) the specified relocation. Since this replaces the code |
| 1688 | in bfd_perform_relocation, it is basically an Xtensa-specific, |
| 1689 | stripped-down version of bfd_perform_relocation. */ |
| 1690 | |
| 1691 | static bfd_reloc_status_type |
| 1692 | bfd_elf_xtensa_reloc (abfd, reloc_entry, symbol, data, input_section, |
| 1693 | output_bfd, error_message) |
| 1694 | bfd *abfd; |
| 1695 | arelent *reloc_entry; |
| 1696 | asymbol *symbol; |
| 1697 | PTR data; |
| 1698 | asection *input_section; |
| 1699 | bfd *output_bfd; |
| 1700 | char **error_message; |
| 1701 | { |
| 1702 | bfd_vma relocation; |
| 1703 | bfd_reloc_status_type flag; |
| 1704 | bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd); |
| 1705 | bfd_vma output_base = 0; |
| 1706 | reloc_howto_type *howto = reloc_entry->howto; |
| 1707 | asection *reloc_target_output_section; |
| 1708 | bfd_boolean is_weak_undef; |
| 1709 | |
| 1710 | /* ELF relocs are against symbols. If we are producing relocatable |
| 1711 | output, and the reloc is against an external symbol, the resulting |
| 1712 | reloc will also be against the same symbol. In such a case, we |
| 1713 | don't want to change anything about the way the reloc is handled, |
| 1714 | since it will all be done at final link time. This test is similar |
| 1715 | to what bfd_elf_generic_reloc does except that it lets relocs with |
| 1716 | howto->partial_inplace go through even if the addend is non-zero. |
| 1717 | (The real problem is that partial_inplace is set for XTENSA_32 |
| 1718 | relocs to begin with, but that's a long story and there's little we |
| 1719 | can do about it now....) */ |
| 1720 | |
| 1721 | if (output_bfd != (bfd *) NULL |
| 1722 | && (symbol->flags & BSF_SECTION_SYM) == 0) |
| 1723 | { |
| 1724 | reloc_entry->address += input_section->output_offset; |
| 1725 | return bfd_reloc_ok; |
| 1726 | } |
| 1727 | |
| 1728 | /* Is the address of the relocation really within the section? */ |
| 1729 | if (reloc_entry->address > (input_section->_cooked_size |
| 1730 | / bfd_octets_per_byte (abfd))) |
| 1731 | return bfd_reloc_outofrange; |
| 1732 | |
| 1733 | /* Work out which section the relocation is targetted at and the |
| 1734 | initial relocation command value. */ |
| 1735 | |
| 1736 | /* Get symbol value. (Common symbols are special.) */ |
| 1737 | if (bfd_is_com_section (symbol->section)) |
| 1738 | relocation = 0; |
| 1739 | else |
| 1740 | relocation = symbol->value; |
| 1741 | |
| 1742 | reloc_target_output_section = symbol->section->output_section; |
| 1743 | |
| 1744 | /* Convert input-section-relative symbol value to absolute. */ |
| 1745 | if ((output_bfd && !howto->partial_inplace) |
| 1746 | || reloc_target_output_section == NULL) |
| 1747 | output_base = 0; |
| 1748 | else |
| 1749 | output_base = reloc_target_output_section->vma; |
| 1750 | |
| 1751 | relocation += output_base + symbol->section->output_offset; |
| 1752 | |
| 1753 | /* Add in supplied addend. */ |
| 1754 | relocation += reloc_entry->addend; |
| 1755 | |
| 1756 | /* Here the variable relocation holds the final address of the |
| 1757 | symbol we are relocating against, plus any addend. */ |
| 1758 | if (output_bfd) |
| 1759 | { |
| 1760 | if (!howto->partial_inplace) |
| 1761 | { |
| 1762 | /* This is a partial relocation, and we want to apply the relocation |
| 1763 | to the reloc entry rather than the raw data. Everything except |
| 1764 | relocations against section symbols has already been handled |
| 1765 | above. */ |
| 1766 | |
| 1767 | BFD_ASSERT (symbol->flags & BSF_SECTION_SYM); |
| 1768 | reloc_entry->addend = relocation; |
| 1769 | reloc_entry->address += input_section->output_offset; |
| 1770 | return bfd_reloc_ok; |
| 1771 | } |
| 1772 | else |
| 1773 | { |
| 1774 | reloc_entry->address += input_section->output_offset; |
| 1775 | reloc_entry->addend = 0; |
| 1776 | } |
| 1777 | } |
| 1778 | |
| 1779 | is_weak_undef = (bfd_is_und_section (symbol->section) |
| 1780 | && (symbol->flags & BSF_WEAK) != 0); |
| 1781 | flag = elf_xtensa_do_reloc (howto, abfd, input_section, relocation, |
| 1782 | (bfd_byte *) data, (bfd_vma) octets, |
| 1783 | is_weak_undef, error_message); |
| 1784 | |
| 1785 | if (flag == bfd_reloc_dangerous) |
| 1786 | { |
| 1787 | /* Add the symbol name to the error message. */ |
| 1788 | if (! *error_message) |
| 1789 | *error_message = ""; |
| 1790 | *error_message = vsprint_msg (*error_message, ": (%s + 0x%lx)", |
| 1791 | strlen (symbol->name) + 17, |
| 1792 | symbol->name, reloc_entry->addend); |
| 1793 | } |
| 1794 | |
| 1795 | return flag; |
| 1796 | } |
| 1797 | |
| 1798 | |
| 1799 | /* Set up an entry in the procedure linkage table. */ |
| 1800 | |
| 1801 | static bfd_vma |
| 1802 | elf_xtensa_create_plt_entry (dynobj, output_bfd, reloc_index) |
| 1803 | bfd *dynobj; |
| 1804 | bfd *output_bfd; |
| 1805 | unsigned reloc_index; |
| 1806 | { |
| 1807 | asection *splt, *sgotplt; |
| 1808 | bfd_vma plt_base, got_base; |
| 1809 | bfd_vma code_offset, lit_offset; |
| 1810 | int chunk; |
| 1811 | |
| 1812 | chunk = reloc_index / PLT_ENTRIES_PER_CHUNK; |
| 1813 | splt = elf_xtensa_get_plt_section (dynobj, chunk); |
| 1814 | sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk); |
| 1815 | BFD_ASSERT (splt != NULL && sgotplt != NULL); |
| 1816 | |
| 1817 | plt_base = splt->output_section->vma + splt->output_offset; |
| 1818 | got_base = sgotplt->output_section->vma + sgotplt->output_offset; |
| 1819 | |
| 1820 | lit_offset = 8 + (reloc_index % PLT_ENTRIES_PER_CHUNK) * 4; |
| 1821 | code_offset = (reloc_index % PLT_ENTRIES_PER_CHUNK) * PLT_ENTRY_SIZE; |
| 1822 | |
| 1823 | /* Fill in the literal entry. This is the offset of the dynamic |
| 1824 | relocation entry. */ |
| 1825 | bfd_put_32 (output_bfd, reloc_index * sizeof (Elf32_External_Rela), |
| 1826 | sgotplt->contents + lit_offset); |
| 1827 | |
| 1828 | /* Fill in the entry in the procedure linkage table. */ |
| 1829 | memcpy (splt->contents + code_offset, |
| 1830 | (bfd_big_endian (output_bfd) |
| 1831 | ? elf_xtensa_be_plt_entry |
| 1832 | : elf_xtensa_le_plt_entry), |
| 1833 | PLT_ENTRY_SIZE); |
| 1834 | bfd_put_16 (output_bfd, l32r_offset (got_base + 0, |
| 1835 | plt_base + code_offset + 3), |
| 1836 | splt->contents + code_offset + 4); |
| 1837 | bfd_put_16 (output_bfd, l32r_offset (got_base + 4, |
| 1838 | plt_base + code_offset + 6), |
| 1839 | splt->contents + code_offset + 7); |
| 1840 | bfd_put_16 (output_bfd, l32r_offset (got_base + lit_offset, |
| 1841 | plt_base + code_offset + 9), |
| 1842 | splt->contents + code_offset + 10); |
| 1843 | |
| 1844 | return plt_base + code_offset; |
| 1845 | } |
| 1846 | |
| 1847 | |
| 1848 | /* Relocate an Xtensa ELF section. This is invoked by the linker for |
| 1849 | both relocatable and final links. */ |
| 1850 | |
| 1851 | static bfd_boolean |
| 1852 | elf_xtensa_relocate_section (output_bfd, info, input_bfd, |
| 1853 | input_section, contents, relocs, |
| 1854 | local_syms, local_sections) |
| 1855 | bfd *output_bfd; |
| 1856 | struct bfd_link_info *info; |
| 1857 | bfd *input_bfd; |
| 1858 | asection *input_section; |
| 1859 | bfd_byte *contents; |
| 1860 | Elf_Internal_Rela *relocs; |
| 1861 | Elf_Internal_Sym *local_syms; |
| 1862 | asection **local_sections; |
| 1863 | { |
| 1864 | Elf_Internal_Shdr *symtab_hdr; |
| 1865 | Elf_Internal_Rela *rel; |
| 1866 | Elf_Internal_Rela *relend; |
| 1867 | struct elf_link_hash_entry **sym_hashes; |
| 1868 | asection *srelgot, *srelplt; |
| 1869 | bfd *dynobj; |
| 1870 | char *error_message = NULL; |
| 1871 | |
| 1872 | if (xtensa_default_isa == NULL) |
| 1873 | xtensa_isa_init (); |
| 1874 | |
| 1875 | dynobj = elf_hash_table (info)->dynobj; |
| 1876 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 1877 | sym_hashes = elf_sym_hashes (input_bfd); |
| 1878 | |
| 1879 | srelgot = NULL; |
| 1880 | srelplt = NULL; |
| 1881 | if (dynobj != NULL) |
| 1882 | { |
| 1883 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got");; |
| 1884 | srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); |
| 1885 | } |
| 1886 | |
| 1887 | rel = relocs; |
| 1888 | relend = relocs + input_section->reloc_count; |
| 1889 | for (; rel < relend; rel++) |
| 1890 | { |
| 1891 | int r_type; |
| 1892 | reloc_howto_type *howto; |
| 1893 | unsigned long r_symndx; |
| 1894 | struct elf_link_hash_entry *h; |
| 1895 | Elf_Internal_Sym *sym; |
| 1896 | asection *sec; |
| 1897 | bfd_vma relocation; |
| 1898 | bfd_reloc_status_type r; |
| 1899 | bfd_boolean is_weak_undef; |
| 1900 | bfd_boolean unresolved_reloc; |
| 1901 | bfd_boolean warned; |
| 1902 | |
| 1903 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1904 | if (r_type == (int) R_XTENSA_GNU_VTINHERIT |
| 1905 | || r_type == (int) R_XTENSA_GNU_VTENTRY) |
| 1906 | continue; |
| 1907 | |
| 1908 | if (r_type < 0 || r_type >= (int) R_XTENSA_max) |
| 1909 | { |
| 1910 | bfd_set_error (bfd_error_bad_value); |
| 1911 | return FALSE; |
| 1912 | } |
| 1913 | howto = &elf_howto_table[r_type]; |
| 1914 | |
| 1915 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1916 | |
| 1917 | if (info->relocatable) |
| 1918 | { |
| 1919 | /* This is a relocatable link. |
| 1920 | 1) If the reloc is against a section symbol, adjust |
| 1921 | according to the output section. |
| 1922 | 2) If there is a new target for this relocation, |
| 1923 | the new target will be in the same output section. |
| 1924 | We adjust the relocation by the output section |
| 1925 | difference. */ |
| 1926 | |
| 1927 | if (relaxing_section) |
| 1928 | { |
| 1929 | /* Check if this references a section in another input file. */ |
| 1930 | do_fix_for_relocatable_link (rel, input_bfd, input_section); |
| 1931 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1932 | } |
| 1933 | |
| 1934 | if (r_type == R_XTENSA_ASM_SIMPLIFY) |
| 1935 | { |
| 1936 | /* Convert ASM_SIMPLIFY into the simpler relocation |
| 1937 | so that they never escape a relaxing link. */ |
| 1938 | contract_asm_expansion (contents, input_section->_raw_size, rel); |
| 1939 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1940 | } |
| 1941 | |
| 1942 | /* This is a relocatable link, so we don't have to change |
| 1943 | anything unless the reloc is against a section symbol, |
| 1944 | in which case we have to adjust according to where the |
| 1945 | section symbol winds up in the output section. */ |
| 1946 | if (r_symndx < symtab_hdr->sh_info) |
| 1947 | { |
| 1948 | sym = local_syms + r_symndx; |
| 1949 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 1950 | { |
| 1951 | sec = local_sections[r_symndx]; |
| 1952 | rel->r_addend += sec->output_offset + sym->st_value; |
| 1953 | } |
| 1954 | } |
| 1955 | |
| 1956 | /* If there is an addend with a partial_inplace howto, |
| 1957 | then move the addend to the contents. This is a hack |
| 1958 | to work around problems with DWARF in relocatable links |
| 1959 | with some previous version of BFD. Now we can't easily get |
| 1960 | rid of the hack without breaking backward compatibility.... */ |
| 1961 | if (rel->r_addend) |
| 1962 | { |
| 1963 | howto = &elf_howto_table[r_type]; |
| 1964 | if (howto->partial_inplace) |
| 1965 | { |
| 1966 | r = elf_xtensa_do_reloc (howto, input_bfd, input_section, |
| 1967 | rel->r_addend, contents, |
| 1968 | rel->r_offset, FALSE, |
| 1969 | &error_message); |
| 1970 | if (r != bfd_reloc_ok) |
| 1971 | { |
| 1972 | if (!((*info->callbacks->reloc_dangerous) |
| 1973 | (info, error_message, input_bfd, input_section, |
| 1974 | rel->r_offset))) |
| 1975 | return FALSE; |
| 1976 | } |
| 1977 | rel->r_addend = 0; |
| 1978 | } |
| 1979 | } |
| 1980 | |
| 1981 | /* Done with work for relocatable link; continue with next reloc. */ |
| 1982 | continue; |
| 1983 | } |
| 1984 | |
| 1985 | /* This is a final link. */ |
| 1986 | |
| 1987 | h = NULL; |
| 1988 | sym = NULL; |
| 1989 | sec = NULL; |
| 1990 | is_weak_undef = FALSE; |
| 1991 | unresolved_reloc = FALSE; |
| 1992 | warned = FALSE; |
| 1993 | |
| 1994 | if (howto->partial_inplace) |
| 1995 | { |
| 1996 | /* Because R_XTENSA_32 was made partial_inplace to fix some |
| 1997 | problems with DWARF info in partial links, there may be |
| 1998 | an addend stored in the contents. Take it out of there |
| 1999 | and move it back into the addend field of the reloc. */ |
| 2000 | rel->r_addend += bfd_get_32 (input_bfd, contents + rel->r_offset); |
| 2001 | bfd_put_32 (input_bfd, 0, contents + rel->r_offset); |
| 2002 | } |
| 2003 | |
| 2004 | if (r_symndx < symtab_hdr->sh_info) |
| 2005 | { |
| 2006 | sym = local_syms + r_symndx; |
| 2007 | sec = local_sections[r_symndx]; |
| 2008 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel); |
| 2009 | } |
| 2010 | else |
| 2011 | { |
| 2012 | RELOC_FOR_GLOBAL_SYMBOL (h, sym_hashes, r_symndx, |
| 2013 | symtab_hdr, relocation, sec, |
| 2014 | unresolved_reloc, info, |
| 2015 | warned); |
| 2016 | |
| 2017 | if (relocation == 0 |
| 2018 | && !unresolved_reloc |
| 2019 | && h->root.type == bfd_link_hash_undefweak) |
| 2020 | is_weak_undef = TRUE; |
| 2021 | } |
| 2022 | |
| 2023 | if (relaxing_section) |
| 2024 | { |
| 2025 | /* Check if this references a section in another input file. */ |
| 2026 | do_fix_for_final_link (rel, input_section, &relocation); |
| 2027 | |
| 2028 | /* Update some already cached values. */ |
| 2029 | r_type = ELF32_R_TYPE (rel->r_info); |
| 2030 | howto = &elf_howto_table[r_type]; |
| 2031 | } |
| 2032 | |
| 2033 | /* Sanity check the address. */ |
| 2034 | if (rel->r_offset >= input_section->_raw_size |
| 2035 | && ELF32_R_TYPE (rel->r_info) != R_XTENSA_NONE) |
| 2036 | { |
| 2037 | bfd_set_error (bfd_error_bad_value); |
| 2038 | return FALSE; |
| 2039 | } |
| 2040 | |
| 2041 | /* Generate dynamic relocations. */ |
| 2042 | if (elf_hash_table (info)->dynamic_sections_created) |
| 2043 | { |
| 2044 | bfd_boolean dynamic_symbol = xtensa_elf_dynamic_symbol_p (h, info); |
| 2045 | |
| 2046 | if (dynamic_symbol && (r_type == R_XTENSA_OP0 |
| 2047 | || r_type == R_XTENSA_OP1 |
| 2048 | || r_type == R_XTENSA_OP2)) |
| 2049 | { |
| 2050 | /* This is an error. The symbol's real value won't be known |
| 2051 | until runtime and it's likely to be out of range anyway. */ |
| 2052 | const char *name = h->root.root.string; |
| 2053 | error_message = vsprint_msg ("invalid relocation for dynamic " |
| 2054 | "symbol", ": %s", |
| 2055 | strlen (name) + 2, name); |
| 2056 | if (!((*info->callbacks->reloc_dangerous) |
| 2057 | (info, error_message, input_bfd, input_section, |
| 2058 | rel->r_offset))) |
| 2059 | return FALSE; |
| 2060 | } |
| 2061 | else if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT) |
| 2062 | && (input_section->flags & SEC_ALLOC) != 0 |
| 2063 | && (dynamic_symbol || info->shared)) |
| 2064 | { |
| 2065 | Elf_Internal_Rela outrel; |
| 2066 | bfd_byte *loc; |
| 2067 | asection *srel; |
| 2068 | |
| 2069 | if (dynamic_symbol && r_type == R_XTENSA_PLT) |
| 2070 | srel = srelplt; |
| 2071 | else |
| 2072 | srel = srelgot; |
| 2073 | |
| 2074 | BFD_ASSERT (srel != NULL); |
| 2075 | |
| 2076 | outrel.r_offset = |
| 2077 | _bfd_elf_section_offset (output_bfd, info, |
| 2078 | input_section, rel->r_offset); |
| 2079 | |
| 2080 | if ((outrel.r_offset | 1) == (bfd_vma) -1) |
| 2081 | memset (&outrel, 0, sizeof outrel); |
| 2082 | else |
| 2083 | { |
| 2084 | outrel.r_offset = (input_section->output_section->vma |
| 2085 | + input_section->output_offset); |
| 2086 | |
| 2087 | if (dynamic_symbol) |
| 2088 | { |
| 2089 | outrel.r_addend = rel->r_addend; |
| 2090 | rel->r_addend = 0; |
| 2091 | |
| 2092 | if (r_type == R_XTENSA_32) |
| 2093 | { |
| 2094 | outrel.r_info = |
| 2095 | ELF32_R_INFO (h->dynindx, R_XTENSA_GLOB_DAT); |
| 2096 | relocation = 0; |
| 2097 | } |
| 2098 | else /* r_type == R_XTENSA_PLT */ |
| 2099 | { |
| 2100 | outrel.r_info = |
| 2101 | ELF32_R_INFO (h->dynindx, R_XTENSA_JMP_SLOT); |
| 2102 | |
| 2103 | /* Create the PLT entry and set the initial |
| 2104 | contents of the literal entry to the address of |
| 2105 | the PLT entry. */ |
| 2106 | relocation = |
| 2107 | elf_xtensa_create_plt_entry (dynobj, output_bfd, |
| 2108 | srel->reloc_count); |
| 2109 | } |
| 2110 | unresolved_reloc = FALSE; |
| 2111 | } |
| 2112 | else |
| 2113 | { |
| 2114 | /* Generate a RELATIVE relocation. */ |
| 2115 | outrel.r_info = ELF32_R_INFO (0, R_XTENSA_RELATIVE); |
| 2116 | outrel.r_addend = 0; |
| 2117 | } |
| 2118 | } |
| 2119 | |
| 2120 | loc = (srel->contents |
| 2121 | + srel->reloc_count++ * sizeof (Elf32_External_Rela)); |
| 2122 | bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); |
| 2123 | BFD_ASSERT (sizeof (Elf32_External_Rela) * srel->reloc_count |
| 2124 | <= srel->_cooked_size); |
| 2125 | } |
| 2126 | } |
| 2127 | |
| 2128 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| 2129 | because such sections are not SEC_ALLOC and thus ld.so will |
| 2130 | not process them. */ |
| 2131 | if (unresolved_reloc |
| 2132 | && !((input_section->flags & SEC_DEBUGGING) != 0 |
| 2133 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) |
| 2134 | (*_bfd_error_handler) |
| 2135 | (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), |
| 2136 | bfd_archive_filename (input_bfd), |
| 2137 | bfd_get_section_name (input_bfd, input_section), |
| 2138 | (long) rel->r_offset, |
| 2139 | h->root.root.string); |
| 2140 | |
| 2141 | /* There's no point in calling bfd_perform_relocation here. |
| 2142 | Just go directly to our "special function". */ |
| 2143 | r = elf_xtensa_do_reloc (howto, input_bfd, input_section, |
| 2144 | relocation + rel->r_addend, |
| 2145 | contents, rel->r_offset, is_weak_undef, |
| 2146 | &error_message); |
| 2147 | |
| 2148 | if (r != bfd_reloc_ok && !warned) |
| 2149 | { |
| 2150 | const char *name; |
| 2151 | |
| 2152 | BFD_ASSERT (r == bfd_reloc_dangerous); |
| 2153 | BFD_ASSERT (error_message != (char *) NULL); |
| 2154 | |
| 2155 | if (h != NULL) |
| 2156 | name = h->root.root.string; |
| 2157 | else |
| 2158 | { |
| 2159 | name = bfd_elf_string_from_elf_section |
| 2160 | (input_bfd, symtab_hdr->sh_link, sym->st_name); |
| 2161 | if (name && *name == '\0') |
| 2162 | name = bfd_section_name (input_bfd, sec); |
| 2163 | } |
| 2164 | if (name) |
| 2165 | error_message = vsprint_msg (error_message, ": %s", |
| 2166 | strlen (name), name); |
| 2167 | if (!((*info->callbacks->reloc_dangerous) |
| 2168 | (info, error_message, input_bfd, input_section, |
| 2169 | rel->r_offset))) |
| 2170 | return FALSE; |
| 2171 | } |
| 2172 | } |
| 2173 | |
| 2174 | return TRUE; |
| 2175 | } |
| 2176 | |
| 2177 | |
| 2178 | /* Finish up dynamic symbol handling. There's not much to do here since |
| 2179 | the PLT and GOT entries are all set up by relocate_section. */ |
| 2180 | |
| 2181 | static bfd_boolean |
| 2182 | elf_xtensa_finish_dynamic_symbol (output_bfd, info, h, sym) |
| 2183 | bfd *output_bfd ATTRIBUTE_UNUSED; |
| 2184 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| 2185 | struct elf_link_hash_entry *h; |
| 2186 | Elf_Internal_Sym *sym; |
| 2187 | { |
| 2188 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0 |
| 2189 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 2190 | { |
| 2191 | /* Mark the symbol as undefined, rather than as defined in |
| 2192 | the .plt section. Leave the value alone. */ |
| 2193 | sym->st_shndx = SHN_UNDEF; |
| 2194 | } |
| 2195 | |
| 2196 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ |
| 2197 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| 2198 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 2199 | sym->st_shndx = SHN_ABS; |
| 2200 | |
| 2201 | return TRUE; |
| 2202 | } |
| 2203 | |
| 2204 | |
| 2205 | /* Combine adjacent literal table entries in the output. Adjacent |
| 2206 | entries within each input section may have been removed during |
| 2207 | relaxation, but we repeat the process here, even though it's too late |
| 2208 | to shrink the output section, because it's important to minimize the |
| 2209 | number of literal table entries to reduce the start-up work for the |
| 2210 | runtime linker. Returns the number of remaining table entries or -1 |
| 2211 | on error. */ |
| 2212 | |
| 2213 | static int |
| 2214 | elf_xtensa_combine_prop_entries (output_bfd, sxtlit, sgotloc) |
| 2215 | bfd *output_bfd; |
| 2216 | asection *sxtlit; |
| 2217 | asection *sgotloc; |
| 2218 | { |
| 2219 | bfd_byte *contents; |
| 2220 | property_table_entry *table; |
| 2221 | bfd_size_type section_size, sgotloc_size; |
| 2222 | bfd_vma offset; |
| 2223 | int n, m, num; |
| 2224 | |
| 2225 | section_size = (sxtlit->_cooked_size != 0 |
| 2226 | ? sxtlit->_cooked_size : sxtlit->_raw_size); |
| 2227 | BFD_ASSERT (section_size % 8 == 0); |
| 2228 | num = section_size / 8; |
| 2229 | |
| 2230 | sgotloc_size = (sgotloc->_cooked_size != 0 |
| 2231 | ? sgotloc->_cooked_size : sgotloc->_raw_size); |
| 2232 | if (sgotloc_size != section_size) |
| 2233 | { |
| 2234 | (*_bfd_error_handler) |
| 2235 | ("internal inconsistency in size of .got.loc section"); |
| 2236 | return -1; |
| 2237 | } |
| 2238 | |
| 2239 | contents = (bfd_byte *) bfd_malloc (section_size); |
| 2240 | table = (property_table_entry *) |
| 2241 | bfd_malloc (num * sizeof (property_table_entry)); |
| 2242 | if (contents == 0 || table == 0) |
| 2243 | return -1; |
| 2244 | |
| 2245 | /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this |
| 2246 | propagates to the output section, where it doesn't really apply and |
| 2247 | where it breaks the following call to bfd_get_section_contents. */ |
| 2248 | sxtlit->flags &= ~SEC_IN_MEMORY; |
| 2249 | |
| 2250 | if (! bfd_get_section_contents (output_bfd, sxtlit, contents, 0, |
| 2251 | section_size)) |
| 2252 | return -1; |
| 2253 | |
| 2254 | /* There should never be any relocations left at this point, so this |
| 2255 | is quite a bit easier than what is done during relaxation. */ |
| 2256 | |
| 2257 | /* Copy the raw contents into a property table array and sort it. */ |
| 2258 | offset = 0; |
| 2259 | for (n = 0; n < num; n++) |
| 2260 | { |
| 2261 | table[n].address = bfd_get_32 (output_bfd, &contents[offset]); |
| 2262 | table[n].size = bfd_get_32 (output_bfd, &contents[offset + 4]); |
| 2263 | offset += 8; |
| 2264 | } |
| 2265 | qsort (table, num, sizeof (property_table_entry), property_table_compare); |
| 2266 | |
| 2267 | for (n = 0; n < num; n++) |
| 2268 | { |
| 2269 | bfd_boolean remove = FALSE; |
| 2270 | |
| 2271 | if (table[n].size == 0) |
| 2272 | remove = TRUE; |
| 2273 | else if (n > 0 && |
| 2274 | (table[n-1].address + table[n-1].size == table[n].address)) |
| 2275 | { |
| 2276 | table[n-1].size += table[n].size; |
| 2277 | remove = TRUE; |
| 2278 | } |
| 2279 | |
| 2280 | if (remove) |
| 2281 | { |
| 2282 | for (m = n; m < num - 1; m++) |
| 2283 | { |
| 2284 | table[m].address = table[m+1].address; |
| 2285 | table[m].size = table[m+1].size; |
| 2286 | } |
| 2287 | |
| 2288 | n--; |
| 2289 | num--; |
| 2290 | } |
| 2291 | } |
| 2292 | |
| 2293 | /* Copy the data back to the raw contents. */ |
| 2294 | offset = 0; |
| 2295 | for (n = 0; n < num; n++) |
| 2296 | { |
| 2297 | bfd_put_32 (output_bfd, table[n].address, &contents[offset]); |
| 2298 | bfd_put_32 (output_bfd, table[n].size, &contents[offset + 4]); |
| 2299 | offset += 8; |
| 2300 | } |
| 2301 | |
| 2302 | /* Clear the removed bytes. */ |
| 2303 | if ((bfd_size_type) (num * 8) < section_size) |
| 2304 | { |
| 2305 | memset (&contents[num * 8], 0, section_size - num * 8); |
| 2306 | sxtlit->_cooked_size = num * 8; |
| 2307 | } |
| 2308 | |
| 2309 | if (! bfd_set_section_contents (output_bfd, sxtlit, contents, 0, |
| 2310 | section_size)) |
| 2311 | return -1; |
| 2312 | |
| 2313 | /* Copy the contents to ".got.loc". */ |
| 2314 | memcpy (sgotloc->contents, contents, section_size); |
| 2315 | |
| 2316 | free (contents); |
| 2317 | return num; |
| 2318 | } |
| 2319 | |
| 2320 | |
| 2321 | /* Finish up the dynamic sections. */ |
| 2322 | |
| 2323 | static bfd_boolean |
| 2324 | elf_xtensa_finish_dynamic_sections (output_bfd, info) |
| 2325 | bfd *output_bfd; |
| 2326 | struct bfd_link_info *info; |
| 2327 | { |
| 2328 | bfd *dynobj; |
| 2329 | asection *sdyn, *srelplt, *sgot, *sxtlit, *sgotloc; |
| 2330 | Elf32_External_Dyn *dyncon, *dynconend; |
| 2331 | int num_xtlit_entries; |
| 2332 | |
| 2333 | if (! elf_hash_table (info)->dynamic_sections_created) |
| 2334 | return TRUE; |
| 2335 | |
| 2336 | dynobj = elf_hash_table (info)->dynobj; |
| 2337 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 2338 | BFD_ASSERT (sdyn != NULL); |
| 2339 | |
| 2340 | /* Set the first entry in the global offset table to the address of |
| 2341 | the dynamic section. */ |
| 2342 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 2343 | if (sgot) |
| 2344 | { |
| 2345 | BFD_ASSERT (sgot->_raw_size == 4); |
| 2346 | if (sdyn == NULL) |
| 2347 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); |
| 2348 | else |
| 2349 | bfd_put_32 (output_bfd, |
| 2350 | sdyn->output_section->vma + sdyn->output_offset, |
| 2351 | sgot->contents); |
| 2352 | } |
| 2353 | |
| 2354 | srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); |
| 2355 | if (srelplt != NULL && srelplt->_raw_size != 0) |
| 2356 | { |
| 2357 | asection *sgotplt, *srelgot, *spltlittbl; |
| 2358 | int chunk, plt_chunks, plt_entries; |
| 2359 | Elf_Internal_Rela irela; |
| 2360 | bfd_byte *loc; |
| 2361 | unsigned rtld_reloc; |
| 2362 | |
| 2363 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got");; |
| 2364 | BFD_ASSERT (srelgot != NULL); |
| 2365 | |
| 2366 | spltlittbl = bfd_get_section_by_name (dynobj, ".xt.lit.plt"); |
| 2367 | BFD_ASSERT (spltlittbl != NULL); |
| 2368 | |
| 2369 | /* Find the first XTENSA_RTLD relocation. Presumably the rest |
| 2370 | of them follow immediately after.... */ |
| 2371 | for (rtld_reloc = 0; rtld_reloc < srelgot->reloc_count; rtld_reloc++) |
| 2372 | { |
| 2373 | loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela); |
| 2374 | bfd_elf32_swap_reloca_in (output_bfd, loc, &irela); |
| 2375 | if (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD) |
| 2376 | break; |
| 2377 | } |
| 2378 | BFD_ASSERT (rtld_reloc < srelgot->reloc_count); |
| 2379 | |
| 2380 | plt_entries = (srelplt->_raw_size / sizeof (Elf32_External_Rela)); |
| 2381 | plt_chunks = |
| 2382 | (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK; |
| 2383 | |
| 2384 | for (chunk = 0; chunk < plt_chunks; chunk++) |
| 2385 | { |
| 2386 | int chunk_entries = 0; |
| 2387 | |
| 2388 | sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk); |
| 2389 | BFD_ASSERT (sgotplt != NULL); |
| 2390 | |
| 2391 | /* Emit special RTLD relocations for the first two entries in |
| 2392 | each chunk of the .got.plt section. */ |
| 2393 | |
| 2394 | loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela); |
| 2395 | bfd_elf32_swap_reloca_in (output_bfd, loc, &irela); |
| 2396 | BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD); |
| 2397 | irela.r_offset = (sgotplt->output_section->vma |
| 2398 | + sgotplt->output_offset); |
| 2399 | irela.r_addend = 1; /* tell rtld to set value to resolver function */ |
| 2400 | bfd_elf32_swap_reloca_out (output_bfd, &irela, loc); |
| 2401 | rtld_reloc += 1; |
| 2402 | BFD_ASSERT (rtld_reloc <= srelgot->reloc_count); |
| 2403 | |
| 2404 | /* Next literal immediately follows the first. */ |
| 2405 | loc += sizeof (Elf32_External_Rela); |
| 2406 | bfd_elf32_swap_reloca_in (output_bfd, loc, &irela); |
| 2407 | BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD); |
| 2408 | irela.r_offset = (sgotplt->output_section->vma |
| 2409 | + sgotplt->output_offset + 4); |
| 2410 | /* Tell rtld to set value to object's link map. */ |
| 2411 | irela.r_addend = 2; |
| 2412 | bfd_elf32_swap_reloca_out (output_bfd, &irela, loc); |
| 2413 | rtld_reloc += 1; |
| 2414 | BFD_ASSERT (rtld_reloc <= srelgot->reloc_count); |
| 2415 | |
| 2416 | /* Fill in the literal table. */ |
| 2417 | if (chunk < plt_chunks - 1) |
| 2418 | chunk_entries = PLT_ENTRIES_PER_CHUNK; |
| 2419 | else |
| 2420 | chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK); |
| 2421 | |
| 2422 | BFD_ASSERT ((unsigned) (chunk + 1) * 8 <= spltlittbl->_cooked_size); |
| 2423 | bfd_put_32 (output_bfd, |
| 2424 | sgotplt->output_section->vma + sgotplt->output_offset, |
| 2425 | spltlittbl->contents + (chunk * 8) + 0); |
| 2426 | bfd_put_32 (output_bfd, |
| 2427 | 8 + (chunk_entries * 4), |
| 2428 | spltlittbl->contents + (chunk * 8) + 4); |
| 2429 | } |
| 2430 | |
| 2431 | /* All the dynamic relocations have been emitted at this point. |
| 2432 | Make sure the relocation sections are the correct size. */ |
| 2433 | if (srelgot->_cooked_size != (sizeof (Elf32_External_Rela) |
| 2434 | * srelgot->reloc_count) |
| 2435 | || srelplt->_cooked_size != (sizeof (Elf32_External_Rela) |
| 2436 | * srelplt->reloc_count)) |
| 2437 | abort (); |
| 2438 | |
| 2439 | /* The .xt.lit.plt section has just been modified. This must |
| 2440 | happen before the code below which combines adjacent literal |
| 2441 | table entries, and the .xt.lit.plt contents have to be forced to |
| 2442 | the output here. */ |
| 2443 | if (! bfd_set_section_contents (output_bfd, |
| 2444 | spltlittbl->output_section, |
| 2445 | spltlittbl->contents, |
| 2446 | spltlittbl->output_offset, |
| 2447 | spltlittbl->_raw_size)) |
| 2448 | return FALSE; |
| 2449 | /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */ |
| 2450 | spltlittbl->flags &= ~SEC_HAS_CONTENTS; |
| 2451 | } |
| 2452 | |
| 2453 | /* Combine adjacent literal table entries. */ |
| 2454 | BFD_ASSERT (! info->relocatable); |
| 2455 | sxtlit = bfd_get_section_by_name (output_bfd, ".xt.lit"); |
| 2456 | sgotloc = bfd_get_section_by_name (dynobj, ".got.loc"); |
| 2457 | BFD_ASSERT (sxtlit && sgotloc); |
| 2458 | num_xtlit_entries = |
| 2459 | elf_xtensa_combine_prop_entries (output_bfd, sxtlit, sgotloc); |
| 2460 | if (num_xtlit_entries < 0) |
| 2461 | return FALSE; |
| 2462 | |
| 2463 | dyncon = (Elf32_External_Dyn *) sdyn->contents; |
| 2464 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); |
| 2465 | for (; dyncon < dynconend; dyncon++) |
| 2466 | { |
| 2467 | Elf_Internal_Dyn dyn; |
| 2468 | const char *name; |
| 2469 | asection *s; |
| 2470 | |
| 2471 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); |
| 2472 | |
| 2473 | switch (dyn.d_tag) |
| 2474 | { |
| 2475 | default: |
| 2476 | break; |
| 2477 | |
| 2478 | case DT_XTENSA_GOT_LOC_SZ: |
| 2479 | dyn.d_un.d_val = num_xtlit_entries; |
| 2480 | break; |
| 2481 | |
| 2482 | case DT_XTENSA_GOT_LOC_OFF: |
| 2483 | name = ".got.loc"; |
| 2484 | goto get_vma; |
| 2485 | case DT_PLTGOT: |
| 2486 | name = ".got"; |
| 2487 | goto get_vma; |
| 2488 | case DT_JMPREL: |
| 2489 | name = ".rela.plt"; |
| 2490 | get_vma: |
| 2491 | s = bfd_get_section_by_name (output_bfd, name); |
| 2492 | BFD_ASSERT (s); |
| 2493 | dyn.d_un.d_ptr = s->vma; |
| 2494 | break; |
| 2495 | |
| 2496 | case DT_PLTRELSZ: |
| 2497 | s = bfd_get_section_by_name (output_bfd, ".rela.plt"); |
| 2498 | BFD_ASSERT (s); |
| 2499 | dyn.d_un.d_val = (s->_cooked_size ? s->_cooked_size : s->_raw_size); |
| 2500 | break; |
| 2501 | |
| 2502 | case DT_RELASZ: |
| 2503 | /* Adjust RELASZ to not include JMPREL. This matches what |
| 2504 | glibc expects and what is done for several other ELF |
| 2505 | targets (e.g., i386, alpha), but the "correct" behavior |
| 2506 | seems to be unresolved. Since the linker script arranges |
| 2507 | for .rela.plt to follow all other relocation sections, we |
| 2508 | don't have to worry about changing the DT_RELA entry. */ |
| 2509 | s = bfd_get_section_by_name (output_bfd, ".rela.plt"); |
| 2510 | if (s) |
| 2511 | { |
| 2512 | dyn.d_un.d_val -= |
| 2513 | (s->_cooked_size ? s->_cooked_size : s->_raw_size); |
| 2514 | } |
| 2515 | break; |
| 2516 | } |
| 2517 | |
| 2518 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 2519 | } |
| 2520 | |
| 2521 | return TRUE; |
| 2522 | } |
| 2523 | |
| 2524 | \f |
| 2525 | /* Functions for dealing with the e_flags field. */ |
| 2526 | |
| 2527 | /* Merge backend specific data from an object file to the output |
| 2528 | object file when linking. */ |
| 2529 | |
| 2530 | static bfd_boolean |
| 2531 | elf_xtensa_merge_private_bfd_data (ibfd, obfd) |
| 2532 | bfd *ibfd; |
| 2533 | bfd *obfd; |
| 2534 | { |
| 2535 | unsigned out_mach, in_mach; |
| 2536 | flagword out_flag, in_flag; |
| 2537 | |
| 2538 | /* Check if we have the same endianess. */ |
| 2539 | if (!_bfd_generic_verify_endian_match (ibfd, obfd)) |
| 2540 | return FALSE; |
| 2541 | |
| 2542 | /* Don't even pretend to support mixed-format linking. */ |
| 2543 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
| 2544 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
| 2545 | return FALSE; |
| 2546 | |
| 2547 | out_flag = elf_elfheader (obfd)->e_flags; |
| 2548 | in_flag = elf_elfheader (ibfd)->e_flags; |
| 2549 | |
| 2550 | out_mach = out_flag & EF_XTENSA_MACH; |
| 2551 | in_mach = in_flag & EF_XTENSA_MACH; |
| 2552 | if (out_mach != in_mach) |
| 2553 | { |
| 2554 | (*_bfd_error_handler) |
| 2555 | ("%s: incompatible machine type. Output is 0x%x. Input is 0x%x", |
| 2556 | bfd_archive_filename (ibfd), out_mach, in_mach); |
| 2557 | bfd_set_error (bfd_error_wrong_format); |
| 2558 | return FALSE; |
| 2559 | } |
| 2560 | |
| 2561 | if (! elf_flags_init (obfd)) |
| 2562 | { |
| 2563 | elf_flags_init (obfd) = TRUE; |
| 2564 | elf_elfheader (obfd)->e_flags = in_flag; |
| 2565 | |
| 2566 | if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) |
| 2567 | && bfd_get_arch_info (obfd)->the_default) |
| 2568 | return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), |
| 2569 | bfd_get_mach (ibfd)); |
| 2570 | |
| 2571 | return TRUE; |
| 2572 | } |
| 2573 | |
| 2574 | if ((out_flag & EF_XTENSA_XT_INSN) != |
| 2575 | (in_flag & EF_XTENSA_XT_INSN)) |
| 2576 | elf_elfheader(obfd)->e_flags &= (~ EF_XTENSA_XT_INSN); |
| 2577 | |
| 2578 | if ((out_flag & EF_XTENSA_XT_LIT) != |
| 2579 | (in_flag & EF_XTENSA_XT_LIT)) |
| 2580 | elf_elfheader(obfd)->e_flags &= (~ EF_XTENSA_XT_LIT); |
| 2581 | |
| 2582 | return TRUE; |
| 2583 | } |
| 2584 | |
| 2585 | |
| 2586 | static bfd_boolean |
| 2587 | elf_xtensa_set_private_flags (abfd, flags) |
| 2588 | bfd *abfd; |
| 2589 | flagword flags; |
| 2590 | { |
| 2591 | BFD_ASSERT (!elf_flags_init (abfd) |
| 2592 | || elf_elfheader (abfd)->e_flags == flags); |
| 2593 | |
| 2594 | elf_elfheader (abfd)->e_flags |= flags; |
| 2595 | elf_flags_init (abfd) = TRUE; |
| 2596 | |
| 2597 | return TRUE; |
| 2598 | } |
| 2599 | |
| 2600 | |
| 2601 | extern flagword |
| 2602 | elf_xtensa_get_private_bfd_flags (abfd) |
| 2603 | bfd *abfd; |
| 2604 | { |
| 2605 | return elf_elfheader (abfd)->e_flags; |
| 2606 | } |
| 2607 | |
| 2608 | |
| 2609 | static bfd_boolean |
| 2610 | elf_xtensa_print_private_bfd_data (abfd, farg) |
| 2611 | bfd *abfd; |
| 2612 | PTR farg; |
| 2613 | { |
| 2614 | FILE *f = (FILE *) farg; |
| 2615 | flagword e_flags = elf_elfheader (abfd)->e_flags; |
| 2616 | |
| 2617 | fprintf (f, "\nXtensa header:\n"); |
| 2618 | if ((e_flags & EF_XTENSA_MACH) == E_XTENSA_MACH) |
| 2619 | fprintf (f, "\nMachine = Base\n"); |
| 2620 | else |
| 2621 | fprintf (f, "\nMachine Id = 0x%x\n", e_flags & EF_XTENSA_MACH); |
| 2622 | |
| 2623 | fprintf (f, "Insn tables = %s\n", |
| 2624 | (e_flags & EF_XTENSA_XT_INSN) ? "true" : "false"); |
| 2625 | |
| 2626 | fprintf (f, "Literal tables = %s\n", |
| 2627 | (e_flags & EF_XTENSA_XT_LIT) ? "true" : "false"); |
| 2628 | |
| 2629 | return _bfd_elf_print_private_bfd_data (abfd, farg); |
| 2630 | } |
| 2631 | |
| 2632 | |
| 2633 | /* Set the right machine number for an Xtensa ELF file. */ |
| 2634 | |
| 2635 | static bfd_boolean |
| 2636 | elf_xtensa_object_p (abfd) |
| 2637 | bfd *abfd; |
| 2638 | { |
| 2639 | int mach; |
| 2640 | unsigned long arch = elf_elfheader (abfd)->e_flags & EF_XTENSA_MACH; |
| 2641 | |
| 2642 | switch (arch) |
| 2643 | { |
| 2644 | case E_XTENSA_MACH: |
| 2645 | mach = bfd_mach_xtensa; |
| 2646 | break; |
| 2647 | default: |
| 2648 | return FALSE; |
| 2649 | } |
| 2650 | |
| 2651 | (void) bfd_default_set_arch_mach (abfd, bfd_arch_xtensa, mach); |
| 2652 | return TRUE; |
| 2653 | } |
| 2654 | |
| 2655 | |
| 2656 | /* The final processing done just before writing out an Xtensa ELF object |
| 2657 | file. This gets the Xtensa architecture right based on the machine |
| 2658 | number. */ |
| 2659 | |
| 2660 | static void |
| 2661 | elf_xtensa_final_write_processing (abfd, linker) |
| 2662 | bfd *abfd; |
| 2663 | bfd_boolean linker ATTRIBUTE_UNUSED; |
| 2664 | { |
| 2665 | int mach; |
| 2666 | unsigned long val; |
| 2667 | |
| 2668 | switch (mach = bfd_get_mach (abfd)) |
| 2669 | { |
| 2670 | case bfd_mach_xtensa: |
| 2671 | val = E_XTENSA_MACH; |
| 2672 | break; |
| 2673 | default: |
| 2674 | return; |
| 2675 | } |
| 2676 | |
| 2677 | elf_elfheader (abfd)->e_flags &= (~ EF_XTENSA_MACH); |
| 2678 | elf_elfheader (abfd)->e_flags |= val; |
| 2679 | } |
| 2680 | |
| 2681 | |
| 2682 | static enum elf_reloc_type_class |
| 2683 | elf_xtensa_reloc_type_class (rela) |
| 2684 | const Elf_Internal_Rela *rela; |
| 2685 | { |
| 2686 | switch ((int) ELF32_R_TYPE (rela->r_info)) |
| 2687 | { |
| 2688 | case R_XTENSA_RELATIVE: |
| 2689 | return reloc_class_relative; |
| 2690 | case R_XTENSA_JMP_SLOT: |
| 2691 | return reloc_class_plt; |
| 2692 | default: |
| 2693 | return reloc_class_normal; |
| 2694 | } |
| 2695 | } |
| 2696 | |
| 2697 | \f |
| 2698 | static bfd_boolean |
| 2699 | elf_xtensa_discard_info_for_section (abfd, cookie, info, sec) |
| 2700 | bfd *abfd; |
| 2701 | struct elf_reloc_cookie *cookie; |
| 2702 | struct bfd_link_info *info; |
| 2703 | asection *sec; |
| 2704 | { |
| 2705 | bfd_byte *contents; |
| 2706 | bfd_vma section_size; |
| 2707 | bfd_vma offset, actual_offset; |
| 2708 | size_t removed_bytes = 0; |
| 2709 | |
| 2710 | section_size = (sec->_cooked_size ? sec->_cooked_size : sec->_raw_size); |
| 2711 | if (section_size == 0 || section_size % 8 != 0) |
| 2712 | return FALSE; |
| 2713 | |
| 2714 | if (sec->output_section |
| 2715 | && bfd_is_abs_section (sec->output_section)) |
| 2716 | return FALSE; |
| 2717 | |
| 2718 | contents = retrieve_contents (abfd, sec, info->keep_memory); |
| 2719 | if (!contents) |
| 2720 | return FALSE; |
| 2721 | |
| 2722 | cookie->rels = retrieve_internal_relocs (abfd, sec, info->keep_memory); |
| 2723 | if (!cookie->rels) |
| 2724 | { |
| 2725 | release_contents (sec, contents); |
| 2726 | return FALSE; |
| 2727 | } |
| 2728 | |
| 2729 | cookie->rel = cookie->rels; |
| 2730 | cookie->relend = cookie->rels + sec->reloc_count; |
| 2731 | |
| 2732 | for (offset = 0; offset < section_size; offset += 8) |
| 2733 | { |
| 2734 | actual_offset = offset - removed_bytes; |
| 2735 | |
| 2736 | /* The ...symbol_deleted_p function will skip over relocs but it |
| 2737 | won't adjust their offsets, so do that here. */ |
| 2738 | while (cookie->rel < cookie->relend |
| 2739 | && cookie->rel->r_offset < offset) |
| 2740 | { |
| 2741 | cookie->rel->r_offset -= removed_bytes; |
| 2742 | cookie->rel++; |
| 2743 | } |
| 2744 | |
| 2745 | while (cookie->rel < cookie->relend |
| 2746 | && cookie->rel->r_offset == offset) |
| 2747 | { |
| 2748 | if (_bfd_elf32_reloc_symbol_deleted_p (offset, cookie)) |
| 2749 | { |
| 2750 | /* Remove the table entry. (If the reloc type is NONE, then |
| 2751 | the entry has already been merged with another and deleted |
| 2752 | during relaxation.) */ |
| 2753 | if (ELF32_R_TYPE (cookie->rel->r_info) != R_XTENSA_NONE) |
| 2754 | { |
| 2755 | /* Shift the contents up. */ |
| 2756 | if (offset + 8 < section_size) |
| 2757 | memmove (&contents[actual_offset], |
| 2758 | &contents[actual_offset+8], |
| 2759 | section_size - offset - 8); |
| 2760 | removed_bytes += 8; |
| 2761 | } |
| 2762 | |
| 2763 | /* Remove this relocation. */ |
| 2764 | cookie->rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); |
| 2765 | } |
| 2766 | |
| 2767 | /* Adjust the relocation offset for previous removals. This |
| 2768 | should not be done before calling ...symbol_deleted_p |
| 2769 | because it might mess up the offset comparisons there. |
| 2770 | Make sure the offset doesn't underflow in the case where |
| 2771 | the first entry is removed. */ |
| 2772 | if (cookie->rel->r_offset >= removed_bytes) |
| 2773 | cookie->rel->r_offset -= removed_bytes; |
| 2774 | else |
| 2775 | cookie->rel->r_offset = 0; |
| 2776 | |
| 2777 | cookie->rel++; |
| 2778 | } |
| 2779 | } |
| 2780 | |
| 2781 | if (removed_bytes != 0) |
| 2782 | { |
| 2783 | /* Adjust any remaining relocs (shouldn't be any). */ |
| 2784 | for (; cookie->rel < cookie->relend; cookie->rel++) |
| 2785 | { |
| 2786 | if (cookie->rel->r_offset >= removed_bytes) |
| 2787 | cookie->rel->r_offset -= removed_bytes; |
| 2788 | else |
| 2789 | cookie->rel->r_offset = 0; |
| 2790 | } |
| 2791 | |
| 2792 | /* Clear the removed bytes. */ |
| 2793 | memset (&contents[section_size - removed_bytes], 0, removed_bytes); |
| 2794 | |
| 2795 | pin_contents (sec, contents); |
| 2796 | pin_internal_relocs (sec, cookie->rels); |
| 2797 | |
| 2798 | sec->_cooked_size = section_size - removed_bytes; |
| 2799 | /* Also shrink _raw_size. See comments in relax_property_section. */ |
| 2800 | sec->_raw_size = sec->_cooked_size; |
| 2801 | |
| 2802 | if (xtensa_is_littable_section (sec)) |
| 2803 | { |
| 2804 | bfd *dynobj = elf_hash_table (info)->dynobj; |
| 2805 | if (dynobj) |
| 2806 | { |
| 2807 | asection *sgotloc = |
| 2808 | bfd_get_section_by_name (dynobj, ".got.loc"); |
| 2809 | if (sgotloc) |
| 2810 | { |
| 2811 | bfd_size_type sgotloc_size = |
| 2812 | (sgotloc->_cooked_size ? sgotloc->_cooked_size |
| 2813 | : sgotloc->_raw_size); |
| 2814 | sgotloc->_cooked_size = sgotloc_size - removed_bytes; |
| 2815 | sgotloc->_raw_size = sgotloc_size - removed_bytes; |
| 2816 | } |
| 2817 | } |
| 2818 | } |
| 2819 | } |
| 2820 | else |
| 2821 | { |
| 2822 | release_contents (sec, contents); |
| 2823 | release_internal_relocs (sec, cookie->rels); |
| 2824 | } |
| 2825 | |
| 2826 | return (removed_bytes != 0); |
| 2827 | } |
| 2828 | |
| 2829 | |
| 2830 | static bfd_boolean |
| 2831 | elf_xtensa_discard_info (abfd, cookie, info) |
| 2832 | bfd *abfd; |
| 2833 | struct elf_reloc_cookie *cookie; |
| 2834 | struct bfd_link_info *info; |
| 2835 | { |
| 2836 | asection *sec; |
| 2837 | bfd_boolean changed = FALSE; |
| 2838 | |
| 2839 | for (sec = abfd->sections; sec != NULL; sec = sec->next) |
| 2840 | { |
| 2841 | if (xtensa_is_property_section (sec)) |
| 2842 | { |
| 2843 | if (elf_xtensa_discard_info_for_section (abfd, cookie, info, sec)) |
| 2844 | changed = TRUE; |
| 2845 | } |
| 2846 | } |
| 2847 | |
| 2848 | return changed; |
| 2849 | } |
| 2850 | |
| 2851 | |
| 2852 | static bfd_boolean |
| 2853 | elf_xtensa_ignore_discarded_relocs (sec) |
| 2854 | asection *sec; |
| 2855 | { |
| 2856 | return xtensa_is_property_section (sec); |
| 2857 | } |
| 2858 | |
| 2859 | \f |
| 2860 | /* Support for core dump NOTE sections. */ |
| 2861 | |
| 2862 | static bfd_boolean |
| 2863 | elf_xtensa_grok_prstatus (abfd, note) |
| 2864 | bfd *abfd; |
| 2865 | Elf_Internal_Note *note; |
| 2866 | { |
| 2867 | int offset; |
| 2868 | unsigned int raw_size; |
| 2869 | |
| 2870 | /* The size for Xtensa is variable, so don't try to recognize the format |
| 2871 | based on the size. Just assume this is GNU/Linux. */ |
| 2872 | |
| 2873 | /* pr_cursig */ |
| 2874 | elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); |
| 2875 | |
| 2876 | /* pr_pid */ |
| 2877 | elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); |
| 2878 | |
| 2879 | /* pr_reg */ |
| 2880 | offset = 72; |
| 2881 | raw_size = note->descsz - offset - 4; |
| 2882 | |
| 2883 | /* Make a ".reg/999" section. */ |
| 2884 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", |
| 2885 | raw_size, note->descpos + offset); |
| 2886 | } |
| 2887 | |
| 2888 | |
| 2889 | static bfd_boolean |
| 2890 | elf_xtensa_grok_psinfo (abfd, note) |
| 2891 | bfd *abfd; |
| 2892 | Elf_Internal_Note *note; |
| 2893 | { |
| 2894 | switch (note->descsz) |
| 2895 | { |
| 2896 | default: |
| 2897 | return FALSE; |
| 2898 | |
| 2899 | case 128: /* GNU/Linux elf_prpsinfo */ |
| 2900 | elf_tdata (abfd)->core_program |
| 2901 | = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16); |
| 2902 | elf_tdata (abfd)->core_command |
| 2903 | = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80); |
| 2904 | } |
| 2905 | |
| 2906 | /* Note that for some reason, a spurious space is tacked |
| 2907 | onto the end of the args in some (at least one anyway) |
| 2908 | implementations, so strip it off if it exists. */ |
| 2909 | |
| 2910 | { |
| 2911 | char *command = elf_tdata (abfd)->core_command; |
| 2912 | int n = strlen (command); |
| 2913 | |
| 2914 | if (0 < n && command[n - 1] == ' ') |
| 2915 | command[n - 1] = '\0'; |
| 2916 | } |
| 2917 | |
| 2918 | return TRUE; |
| 2919 | } |
| 2920 | |
| 2921 | \f |
| 2922 | /* Generic Xtensa configurability stuff. */ |
| 2923 | |
| 2924 | static xtensa_opcode callx0_op = XTENSA_UNDEFINED; |
| 2925 | static xtensa_opcode callx4_op = XTENSA_UNDEFINED; |
| 2926 | static xtensa_opcode callx8_op = XTENSA_UNDEFINED; |
| 2927 | static xtensa_opcode callx12_op = XTENSA_UNDEFINED; |
| 2928 | static xtensa_opcode call0_op = XTENSA_UNDEFINED; |
| 2929 | static xtensa_opcode call4_op = XTENSA_UNDEFINED; |
| 2930 | static xtensa_opcode call8_op = XTENSA_UNDEFINED; |
| 2931 | static xtensa_opcode call12_op = XTENSA_UNDEFINED; |
| 2932 | |
| 2933 | static void |
| 2934 | init_call_opcodes () |
| 2935 | { |
| 2936 | if (callx0_op == XTENSA_UNDEFINED) |
| 2937 | { |
| 2938 | callx0_op = xtensa_opcode_lookup (xtensa_default_isa, "callx0"); |
| 2939 | callx4_op = xtensa_opcode_lookup (xtensa_default_isa, "callx4"); |
| 2940 | callx8_op = xtensa_opcode_lookup (xtensa_default_isa, "callx8"); |
| 2941 | callx12_op = xtensa_opcode_lookup (xtensa_default_isa, "callx12"); |
| 2942 | call0_op = xtensa_opcode_lookup (xtensa_default_isa, "call0"); |
| 2943 | call4_op = xtensa_opcode_lookup (xtensa_default_isa, "call4"); |
| 2944 | call8_op = xtensa_opcode_lookup (xtensa_default_isa, "call8"); |
| 2945 | call12_op = xtensa_opcode_lookup (xtensa_default_isa, "call12"); |
| 2946 | } |
| 2947 | } |
| 2948 | |
| 2949 | |
| 2950 | static bfd_boolean |
| 2951 | is_indirect_call_opcode (opcode) |
| 2952 | xtensa_opcode opcode; |
| 2953 | { |
| 2954 | init_call_opcodes (); |
| 2955 | return (opcode == callx0_op |
| 2956 | || opcode == callx4_op |
| 2957 | || opcode == callx8_op |
| 2958 | || opcode == callx12_op); |
| 2959 | } |
| 2960 | |
| 2961 | |
| 2962 | static bfd_boolean |
| 2963 | is_direct_call_opcode (opcode) |
| 2964 | xtensa_opcode opcode; |
| 2965 | { |
| 2966 | init_call_opcodes (); |
| 2967 | return (opcode == call0_op |
| 2968 | || opcode == call4_op |
| 2969 | || opcode == call8_op |
| 2970 | || opcode == call12_op); |
| 2971 | } |
| 2972 | |
| 2973 | |
| 2974 | static bfd_boolean |
| 2975 | is_windowed_call_opcode (opcode) |
| 2976 | xtensa_opcode opcode; |
| 2977 | { |
| 2978 | init_call_opcodes (); |
| 2979 | return (opcode == call4_op |
| 2980 | || opcode == call8_op |
| 2981 | || opcode == call12_op |
| 2982 | || opcode == callx4_op |
| 2983 | || opcode == callx8_op |
| 2984 | || opcode == callx12_op); |
| 2985 | } |
| 2986 | |
| 2987 | |
| 2988 | static xtensa_opcode |
| 2989 | get_l32r_opcode (void) |
| 2990 | { |
| 2991 | static xtensa_opcode l32r_opcode = XTENSA_UNDEFINED; |
| 2992 | if (l32r_opcode == XTENSA_UNDEFINED) |
| 2993 | { |
| 2994 | l32r_opcode = xtensa_opcode_lookup (xtensa_default_isa, "l32r"); |
| 2995 | BFD_ASSERT (l32r_opcode != XTENSA_UNDEFINED); |
| 2996 | } |
| 2997 | return l32r_opcode; |
| 2998 | } |
| 2999 | |
| 3000 | |
| 3001 | static bfd_vma |
| 3002 | l32r_offset (addr, pc) |
| 3003 | bfd_vma addr; |
| 3004 | bfd_vma pc; |
| 3005 | { |
| 3006 | bfd_vma offset; |
| 3007 | |
| 3008 | offset = addr - ((pc+3) & -4); |
| 3009 | BFD_ASSERT ((offset & ((1 << 2) - 1)) == 0); |
| 3010 | offset = (signed int) offset >> 2; |
| 3011 | BFD_ASSERT ((signed int) offset >> 16 == -1); |
| 3012 | return offset; |
| 3013 | } |
| 3014 | |
| 3015 | |
| 3016 | /* Get the operand number for a PC-relative relocation. |
| 3017 | If the relocation is not a PC-relative one, return (-1). */ |
| 3018 | |
| 3019 | static int |
| 3020 | get_relocation_opnd (irel) |
| 3021 | Elf_Internal_Rela *irel; |
| 3022 | { |
| 3023 | if (ELF32_R_TYPE (irel->r_info) < R_XTENSA_OP0 |
| 3024 | || ELF32_R_TYPE (irel->r_info) >= R_XTENSA_max) |
| 3025 | return -1; |
| 3026 | return ELF32_R_TYPE (irel->r_info) - R_XTENSA_OP0; |
| 3027 | } |
| 3028 | |
| 3029 | |
| 3030 | /* Get the opcode for a relocation. */ |
| 3031 | |
| 3032 | static xtensa_opcode |
| 3033 | get_relocation_opcode (sec, contents, irel) |
| 3034 | asection *sec; |
| 3035 | bfd_byte *contents; |
| 3036 | Elf_Internal_Rela *irel; |
| 3037 | { |
| 3038 | static xtensa_insnbuf ibuff = NULL; |
| 3039 | xtensa_isa isa = xtensa_default_isa; |
| 3040 | |
| 3041 | if (get_relocation_opnd (irel) == -1) |
| 3042 | return XTENSA_UNDEFINED; |
| 3043 | |
| 3044 | if (contents == NULL) |
| 3045 | return XTENSA_UNDEFINED; |
| 3046 | |
| 3047 | if (sec->_raw_size <= irel->r_offset) |
| 3048 | return XTENSA_UNDEFINED; |
| 3049 | |
| 3050 | if (ibuff == NULL) |
| 3051 | ibuff = xtensa_insnbuf_alloc (isa); |
| 3052 | |
| 3053 | /* Decode the instruction. */ |
| 3054 | xtensa_insnbuf_from_chars (isa, ibuff, &contents[irel->r_offset]); |
| 3055 | return xtensa_decode_insn (isa, ibuff); |
| 3056 | } |
| 3057 | |
| 3058 | |
| 3059 | bfd_boolean |
| 3060 | is_l32r_relocation (sec, contents, irel) |
| 3061 | asection *sec; |
| 3062 | bfd_byte *contents; |
| 3063 | Elf_Internal_Rela *irel; |
| 3064 | { |
| 3065 | xtensa_opcode opcode; |
| 3066 | |
| 3067 | if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_OP1) |
| 3068 | return FALSE; |
| 3069 | |
| 3070 | opcode = get_relocation_opcode (sec, contents, irel); |
| 3071 | return (opcode == get_l32r_opcode ()); |
| 3072 | } |
| 3073 | |
| 3074 | \f |
| 3075 | /* Code for transforming CALLs at link-time. */ |
| 3076 | |
| 3077 | static bfd_reloc_status_type |
| 3078 | elf_xtensa_do_asm_simplify (contents, address, content_length) |
| 3079 | bfd_byte *contents; |
| 3080 | bfd_vma address; |
| 3081 | bfd_vma content_length; |
| 3082 | { |
| 3083 | static xtensa_insnbuf insnbuf = NULL; |
| 3084 | xtensa_opcode opcode; |
| 3085 | xtensa_operand operand; |
| 3086 | xtensa_opcode direct_call_opcode; |
| 3087 | xtensa_isa isa = xtensa_default_isa; |
| 3088 | bfd_byte *chbuf = contents + address; |
| 3089 | int opn; |
| 3090 | |
| 3091 | if (insnbuf == NULL) |
| 3092 | insnbuf = xtensa_insnbuf_alloc (isa); |
| 3093 | |
| 3094 | if (content_length < address) |
| 3095 | { |
| 3096 | (*_bfd_error_handler) |
| 3097 | ("Attempt to convert L32R/CALLX to CALL failed"); |
| 3098 | return bfd_reloc_other; |
| 3099 | } |
| 3100 | |
| 3101 | opcode = get_expanded_call_opcode (chbuf, content_length - address); |
| 3102 | direct_call_opcode = swap_callx_for_call_opcode (opcode); |
| 3103 | if (direct_call_opcode == XTENSA_UNDEFINED) |
| 3104 | { |
| 3105 | (*_bfd_error_handler) |
| 3106 | ("Attempt to convert L32R/CALLX to CALL failed"); |
| 3107 | return bfd_reloc_other; |
| 3108 | } |
| 3109 | |
| 3110 | /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */ |
| 3111 | opcode = xtensa_opcode_lookup (isa, "or"); |
| 3112 | xtensa_encode_insn (isa, opcode, insnbuf); |
| 3113 | for (opn = 0; opn < 3; opn++) |
| 3114 | { |
| 3115 | operand = xtensa_get_operand (isa, opcode, opn); |
| 3116 | xtensa_operand_set_field (operand, insnbuf, 1); |
| 3117 | } |
| 3118 | xtensa_insnbuf_to_chars (isa, insnbuf, chbuf); |
| 3119 | |
| 3120 | /* Assemble a CALL ("callN 0") into the 3 byte offset. */ |
| 3121 | xtensa_encode_insn (isa, direct_call_opcode, insnbuf); |
| 3122 | operand = xtensa_get_operand (isa, opcode, 0); |
| 3123 | xtensa_operand_set_field (operand, insnbuf, 0); |
| 3124 | xtensa_insnbuf_to_chars (isa, insnbuf, chbuf + 3); |
| 3125 | |
| 3126 | return bfd_reloc_ok; |
| 3127 | } |
| 3128 | |
| 3129 | |
| 3130 | static bfd_reloc_status_type |
| 3131 | contract_asm_expansion (contents, content_length, irel) |
| 3132 | bfd_byte *contents; |
| 3133 | bfd_vma content_length; |
| 3134 | Elf_Internal_Rela *irel; |
| 3135 | { |
| 3136 | bfd_reloc_status_type retval = |
| 3137 | elf_xtensa_do_asm_simplify (contents, irel->r_offset, content_length); |
| 3138 | |
| 3139 | if (retval != bfd_reloc_ok) |
| 3140 | return retval; |
| 3141 | |
| 3142 | /* Update the irel->r_offset field so that the right immediate and |
| 3143 | the right instruction are modified during the relocation. */ |
| 3144 | irel->r_offset += 3; |
| 3145 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_XTENSA_OP0); |
| 3146 | return bfd_reloc_ok; |
| 3147 | } |
| 3148 | |
| 3149 | |
| 3150 | static xtensa_opcode |
| 3151 | swap_callx_for_call_opcode (opcode) |
| 3152 | xtensa_opcode opcode; |
| 3153 | { |
| 3154 | init_call_opcodes (); |
| 3155 | |
| 3156 | if (opcode == callx0_op) return call0_op; |
| 3157 | if (opcode == callx4_op) return call4_op; |
| 3158 | if (opcode == callx8_op) return call8_op; |
| 3159 | if (opcode == callx12_op) return call12_op; |
| 3160 | |
| 3161 | /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */ |
| 3162 | return XTENSA_UNDEFINED; |
| 3163 | } |
| 3164 | |
| 3165 | |
| 3166 | /* Check if "buf" is pointing to a "L32R aN; CALLX aN" sequence, and |
| 3167 | if so, return the CALLX opcode. If not, return XTENSA_UNDEFINED. */ |
| 3168 | |
| 3169 | #define L32R_TARGET_REG_OPERAND 0 |
| 3170 | #define CALLN_SOURCE_OPERAND 0 |
| 3171 | |
| 3172 | static xtensa_opcode |
| 3173 | get_expanded_call_opcode (buf, bufsize) |
| 3174 | bfd_byte *buf; |
| 3175 | int bufsize; |
| 3176 | { |
| 3177 | static xtensa_insnbuf insnbuf = NULL; |
| 3178 | xtensa_opcode opcode; |
| 3179 | xtensa_operand operand; |
| 3180 | xtensa_isa isa = xtensa_default_isa; |
| 3181 | uint32 regno, call_regno; |
| 3182 | |
| 3183 | /* Buffer must be at least 6 bytes. */ |
| 3184 | if (bufsize < 6) |
| 3185 | return XTENSA_UNDEFINED; |
| 3186 | |
| 3187 | if (insnbuf == NULL) |
| 3188 | insnbuf = xtensa_insnbuf_alloc (isa); |
| 3189 | |
| 3190 | xtensa_insnbuf_from_chars (isa, insnbuf, buf); |
| 3191 | opcode = xtensa_decode_insn (isa, insnbuf); |
| 3192 | |
| 3193 | if (opcode != get_l32r_opcode ()) |
| 3194 | return XTENSA_UNDEFINED; |
| 3195 | |
| 3196 | operand = xtensa_get_operand (isa, opcode, L32R_TARGET_REG_OPERAND); |
| 3197 | regno = xtensa_operand_decode |
| 3198 | (operand, xtensa_operand_get_field (operand, insnbuf)); |
| 3199 | |
| 3200 | /* Next instruction should be an CALLXn with operand 0 == regno. */ |
| 3201 | xtensa_insnbuf_from_chars (isa, insnbuf, |
| 3202 | buf + xtensa_insn_length (isa, opcode)); |
| 3203 | opcode = xtensa_decode_insn (isa, insnbuf); |
| 3204 | |
| 3205 | if (!is_indirect_call_opcode (opcode)) |
| 3206 | return XTENSA_UNDEFINED; |
| 3207 | |
| 3208 | operand = xtensa_get_operand (isa, opcode, CALLN_SOURCE_OPERAND); |
| 3209 | call_regno = xtensa_operand_decode |
| 3210 | (operand, xtensa_operand_get_field (operand, insnbuf)); |
| 3211 | if (call_regno != regno) |
| 3212 | return XTENSA_UNDEFINED; |
| 3213 | |
| 3214 | return opcode; |
| 3215 | } |
| 3216 | |
| 3217 | \f |
| 3218 | /* Data structures used during relaxation. */ |
| 3219 | |
| 3220 | /* r_reloc: relocation values. */ |
| 3221 | |
| 3222 | /* Through the relaxation process, we need to keep track of the values |
| 3223 | that will result from evaluating relocations. The standard ELF |
| 3224 | relocation structure is not sufficient for this purpose because we're |
| 3225 | operating on multiple input files at once, so we need to know which |
| 3226 | input file a relocation refers to. The r_reloc structure thus |
| 3227 | records both the input file (bfd) and ELF relocation. |
| 3228 | |
| 3229 | For efficiency, an r_reloc also contains a "target_offset" field to |
| 3230 | cache the target-section-relative offset value that is represented by |
| 3231 | the relocation. */ |
| 3232 | |
| 3233 | typedef struct r_reloc_struct r_reloc; |
| 3234 | |
| 3235 | struct r_reloc_struct |
| 3236 | { |
| 3237 | bfd *abfd; |
| 3238 | Elf_Internal_Rela rela; |
| 3239 | bfd_vma target_offset; |
| 3240 | }; |
| 3241 | |
| 3242 | static bfd_boolean r_reloc_is_const |
| 3243 | PARAMS ((const r_reloc *)); |
| 3244 | static void r_reloc_init |
| 3245 | PARAMS ((r_reloc *, bfd *, Elf_Internal_Rela *)); |
| 3246 | static bfd_vma r_reloc_get_target_offset |
| 3247 | PARAMS ((const r_reloc *)); |
| 3248 | static asection *r_reloc_get_section |
| 3249 | PARAMS ((const r_reloc *)); |
| 3250 | static bfd_boolean r_reloc_is_defined |
| 3251 | PARAMS ((const r_reloc *)); |
| 3252 | static struct elf_link_hash_entry *r_reloc_get_hash_entry |
| 3253 | PARAMS ((const r_reloc *)); |
| 3254 | |
| 3255 | |
| 3256 | /* The r_reloc structure is included by value in literal_value, but not |
| 3257 | every literal_value has an associated relocation -- some are simple |
| 3258 | constants. In such cases, we set all the fields in the r_reloc |
| 3259 | struct to zero. The r_reloc_is_const function should be used to |
| 3260 | detect this case. */ |
| 3261 | |
| 3262 | static bfd_boolean |
| 3263 | r_reloc_is_const (r_rel) |
| 3264 | const r_reloc *r_rel; |
| 3265 | { |
| 3266 | return (r_rel->abfd == NULL); |
| 3267 | } |
| 3268 | |
| 3269 | |
| 3270 | static void |
| 3271 | r_reloc_init (r_rel, abfd, irel) |
| 3272 | r_reloc *r_rel; |
| 3273 | bfd *abfd; |
| 3274 | Elf_Internal_Rela *irel; |
| 3275 | { |
| 3276 | if (irel != NULL) |
| 3277 | { |
| 3278 | r_rel->rela = *irel; |
| 3279 | r_rel->abfd = abfd; |
| 3280 | r_rel->target_offset = r_reloc_get_target_offset (r_rel); |
| 3281 | } |
| 3282 | else |
| 3283 | memset (r_rel, 0, sizeof (r_reloc)); |
| 3284 | } |
| 3285 | |
| 3286 | |
| 3287 | static bfd_vma |
| 3288 | r_reloc_get_target_offset (r_rel) |
| 3289 | const r_reloc *r_rel; |
| 3290 | { |
| 3291 | bfd_vma target_offset; |
| 3292 | unsigned long r_symndx; |
| 3293 | |
| 3294 | BFD_ASSERT (!r_reloc_is_const (r_rel)); |
| 3295 | r_symndx = ELF32_R_SYM (r_rel->rela.r_info); |
| 3296 | target_offset = get_elf_r_symndx_offset (r_rel->abfd, r_symndx); |
| 3297 | return (target_offset + r_rel->rela.r_addend); |
| 3298 | } |
| 3299 | |
| 3300 | |
| 3301 | static struct elf_link_hash_entry * |
| 3302 | r_reloc_get_hash_entry (r_rel) |
| 3303 | const r_reloc *r_rel; |
| 3304 | { |
| 3305 | unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info); |
| 3306 | return get_elf_r_symndx_hash_entry (r_rel->abfd, r_symndx); |
| 3307 | } |
| 3308 | |
| 3309 | |
| 3310 | static asection * |
| 3311 | r_reloc_get_section (r_rel) |
| 3312 | const r_reloc *r_rel; |
| 3313 | { |
| 3314 | unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info); |
| 3315 | return get_elf_r_symndx_section (r_rel->abfd, r_symndx); |
| 3316 | } |
| 3317 | |
| 3318 | |
| 3319 | static bfd_boolean |
| 3320 | r_reloc_is_defined (r_rel) |
| 3321 | const r_reloc *r_rel; |
| 3322 | { |
| 3323 | asection *sec = r_reloc_get_section (r_rel); |
| 3324 | if (sec == bfd_abs_section_ptr |
| 3325 | || sec == bfd_com_section_ptr |
| 3326 | || sec == bfd_und_section_ptr) |
| 3327 | return FALSE; |
| 3328 | return TRUE; |
| 3329 | } |
| 3330 | |
| 3331 | \f |
| 3332 | /* source_reloc: relocations that reference literal sections. */ |
| 3333 | |
| 3334 | /* To determine whether literals can be coalesced, we need to first |
| 3335 | record all the relocations that reference the literals. The |
| 3336 | source_reloc structure below is used for this purpose. The |
| 3337 | source_reloc entries are kept in a per-literal-section array, sorted |
| 3338 | by offset within the literal section (i.e., target offset). |
| 3339 | |
| 3340 | The source_sec and r_rel.rela.r_offset fields identify the source of |
| 3341 | the relocation. The r_rel field records the relocation value, i.e., |
| 3342 | the offset of the literal being referenced. The opnd field is needed |
| 3343 | to determine the range of the immediate field to which the relocation |
| 3344 | applies, so we can determine whether another literal with the same |
| 3345 | value is within range. The is_null field is true when the relocation |
| 3346 | is being removed (e.g., when an L32R is being removed due to a CALLX |
| 3347 | that is converted to a direct CALL). */ |
| 3348 | |
| 3349 | typedef struct source_reloc_struct source_reloc; |
| 3350 | |
| 3351 | struct source_reloc_struct |
| 3352 | { |
| 3353 | asection *source_sec; |
| 3354 | r_reloc r_rel; |
| 3355 | xtensa_operand opnd; |
| 3356 | bfd_boolean is_null; |
| 3357 | }; |
| 3358 | |
| 3359 | |
| 3360 | static void init_source_reloc |
| 3361 | PARAMS ((source_reloc *, asection *, const r_reloc *, xtensa_operand)); |
| 3362 | static source_reloc *find_source_reloc |
| 3363 | PARAMS ((source_reloc *, int, asection *, Elf_Internal_Rela *)); |
| 3364 | static int source_reloc_compare |
| 3365 | PARAMS ((const PTR, const PTR)); |
| 3366 | |
| 3367 | |
| 3368 | static void |
| 3369 | init_source_reloc (reloc, source_sec, r_rel, opnd) |
| 3370 | source_reloc *reloc; |
| 3371 | asection *source_sec; |
| 3372 | const r_reloc *r_rel; |
| 3373 | xtensa_operand opnd; |
| 3374 | { |
| 3375 | reloc->source_sec = source_sec; |
| 3376 | reloc->r_rel = *r_rel; |
| 3377 | reloc->opnd = opnd; |
| 3378 | reloc->is_null = FALSE; |
| 3379 | } |
| 3380 | |
| 3381 | |
| 3382 | /* Find the source_reloc for a particular source offset and relocation |
| 3383 | type. Note that the array is sorted by _target_ offset, so this is |
| 3384 | just a linear search. */ |
| 3385 | |
| 3386 | static source_reloc * |
| 3387 | find_source_reloc (src_relocs, src_count, sec, irel) |
| 3388 | source_reloc *src_relocs; |
| 3389 | int src_count; |
| 3390 | asection *sec; |
| 3391 | Elf_Internal_Rela *irel; |
| 3392 | { |
| 3393 | int i; |
| 3394 | |
| 3395 | for (i = 0; i < src_count; i++) |
| 3396 | { |
| 3397 | if (src_relocs[i].source_sec == sec |
| 3398 | && src_relocs[i].r_rel.rela.r_offset == irel->r_offset |
| 3399 | && (ELF32_R_TYPE (src_relocs[i].r_rel.rela.r_info) |
| 3400 | == ELF32_R_TYPE (irel->r_info))) |
| 3401 | return &src_relocs[i]; |
| 3402 | } |
| 3403 | |
| 3404 | return NULL; |
| 3405 | } |
| 3406 | |
| 3407 | |
| 3408 | static int |
| 3409 | source_reloc_compare (ap, bp) |
| 3410 | const PTR ap; |
| 3411 | const PTR bp; |
| 3412 | { |
| 3413 | const source_reloc *a = (const source_reloc *) ap; |
| 3414 | const source_reloc *b = (const source_reloc *) bp; |
| 3415 | |
| 3416 | return (a->r_rel.target_offset - b->r_rel.target_offset); |
| 3417 | } |
| 3418 | |
| 3419 | \f |
| 3420 | /* Literal values and value hash tables. */ |
| 3421 | |
| 3422 | /* Literals with the same value can be coalesced. The literal_value |
| 3423 | structure records the value of a literal: the "r_rel" field holds the |
| 3424 | information from the relocation on the literal (if there is one) and |
| 3425 | the "value" field holds the contents of the literal word itself. |
| 3426 | |
| 3427 | The value_map structure records a literal value along with the |
| 3428 | location of a literal holding that value. The value_map hash table |
| 3429 | is indexed by the literal value, so that we can quickly check if a |
| 3430 | particular literal value has been seen before and is thus a candidate |
| 3431 | for coalescing. */ |
| 3432 | |
| 3433 | typedef struct literal_value_struct literal_value; |
| 3434 | typedef struct value_map_struct value_map; |
| 3435 | typedef struct value_map_hash_table_struct value_map_hash_table; |
| 3436 | |
| 3437 | struct literal_value_struct |
| 3438 | { |
| 3439 | r_reloc r_rel; |
| 3440 | unsigned long value; |
| 3441 | }; |
| 3442 | |
| 3443 | struct value_map_struct |
| 3444 | { |
| 3445 | literal_value val; /* The literal value. */ |
| 3446 | r_reloc loc; /* Location of the literal. */ |
| 3447 | value_map *next; |
| 3448 | }; |
| 3449 | |
| 3450 | struct value_map_hash_table_struct |
| 3451 | { |
| 3452 | unsigned bucket_count; |
| 3453 | value_map **buckets; |
| 3454 | unsigned count; |
| 3455 | }; |
| 3456 | |
| 3457 | |
| 3458 | static bfd_boolean is_same_value |
| 3459 | PARAMS ((const literal_value *, const literal_value *)); |
| 3460 | static value_map_hash_table *value_map_hash_table_init |
| 3461 | PARAMS ((void)); |
| 3462 | static unsigned hash_literal_value |
| 3463 | PARAMS ((const literal_value *)); |
| 3464 | static unsigned hash_bfd_vma |
| 3465 | PARAMS ((bfd_vma)); |
| 3466 | static value_map *get_cached_value |
| 3467 | PARAMS ((value_map_hash_table *, const literal_value *)); |
| 3468 | static value_map *add_value_map |
| 3469 | PARAMS ((value_map_hash_table *, const literal_value *, const r_reloc *)); |
| 3470 | |
| 3471 | |
| 3472 | static bfd_boolean |
| 3473 | is_same_value (src1, src2) |
| 3474 | const literal_value *src1; |
| 3475 | const literal_value *src2; |
| 3476 | { |
| 3477 | if (r_reloc_is_const (&src1->r_rel) != r_reloc_is_const (&src2->r_rel)) |
| 3478 | return FALSE; |
| 3479 | |
| 3480 | if (r_reloc_is_const (&src1->r_rel)) |
| 3481 | return (src1->value == src2->value); |
| 3482 | |
| 3483 | if (ELF32_R_TYPE (src1->r_rel.rela.r_info) |
| 3484 | != ELF32_R_TYPE (src2->r_rel.rela.r_info)) |
| 3485 | return FALSE; |
| 3486 | |
| 3487 | if (r_reloc_get_target_offset (&src1->r_rel) |
| 3488 | != r_reloc_get_target_offset (&src2->r_rel)) |
| 3489 | return FALSE; |
| 3490 | |
| 3491 | if (src1->value != src2->value) |
| 3492 | return FALSE; |
| 3493 | |
| 3494 | /* Now check for the same section and the same elf_hash. */ |
| 3495 | if (r_reloc_is_defined (&src1->r_rel)) |
| 3496 | { |
| 3497 | if (r_reloc_get_section (&src1->r_rel) |
| 3498 | != r_reloc_get_section (&src2->r_rel)) |
| 3499 | return FALSE; |
| 3500 | } |
| 3501 | else |
| 3502 | { |
| 3503 | if (r_reloc_get_hash_entry (&src1->r_rel) |
| 3504 | != r_reloc_get_hash_entry (&src2->r_rel)) |
| 3505 | return FALSE; |
| 3506 | |
| 3507 | if (r_reloc_get_hash_entry (&src1->r_rel) == 0) |
| 3508 | return FALSE; |
| 3509 | } |
| 3510 | |
| 3511 | return TRUE; |
| 3512 | } |
| 3513 | |
| 3514 | |
| 3515 | /* Must be power of 2. */ |
| 3516 | #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024 |
| 3517 | |
| 3518 | static value_map_hash_table * |
| 3519 | value_map_hash_table_init () |
| 3520 | { |
| 3521 | value_map_hash_table *values; |
| 3522 | |
| 3523 | values = (value_map_hash_table *) |
| 3524 | bfd_malloc (sizeof (value_map_hash_table)); |
| 3525 | |
| 3526 | values->bucket_count = INITIAL_HASH_RELOC_BUCKET_COUNT; |
| 3527 | values->count = 0; |
| 3528 | values->buckets = (value_map **) |
| 3529 | bfd_zmalloc (sizeof (value_map *) * values->bucket_count); |
| 3530 | |
| 3531 | return values; |
| 3532 | } |
| 3533 | |
| 3534 | |
| 3535 | static unsigned |
| 3536 | hash_bfd_vma (val) |
| 3537 | bfd_vma val; |
| 3538 | { |
| 3539 | return (val >> 2) + (val >> 10); |
| 3540 | } |
| 3541 | |
| 3542 | |
| 3543 | static unsigned |
| 3544 | hash_literal_value (src) |
| 3545 | const literal_value *src; |
| 3546 | { |
| 3547 | unsigned hash_val; |
| 3548 | |
| 3549 | if (r_reloc_is_const (&src->r_rel)) |
| 3550 | return hash_bfd_vma (src->value); |
| 3551 | |
| 3552 | hash_val = (hash_bfd_vma (r_reloc_get_target_offset (&src->r_rel)) |
| 3553 | + hash_bfd_vma (src->value)); |
| 3554 | |
| 3555 | /* Now check for the same section and the same elf_hash. */ |
| 3556 | if (r_reloc_is_defined (&src->r_rel)) |
| 3557 | hash_val += hash_bfd_vma ((bfd_vma) (unsigned) r_reloc_get_section (&src->r_rel)); |
| 3558 | else |
| 3559 | hash_val += hash_bfd_vma ((bfd_vma) (unsigned) r_reloc_get_hash_entry (&src->r_rel)); |
| 3560 | |
| 3561 | return hash_val; |
| 3562 | } |
| 3563 | |
| 3564 | |
| 3565 | /* Check if the specified literal_value has been seen before. */ |
| 3566 | |
| 3567 | static value_map * |
| 3568 | get_cached_value (map, val) |
| 3569 | value_map_hash_table *map; |
| 3570 | const literal_value *val; |
| 3571 | { |
| 3572 | value_map *map_e; |
| 3573 | value_map *bucket; |
| 3574 | unsigned idx; |
| 3575 | |
| 3576 | idx = hash_literal_value (val); |
| 3577 | idx = idx & (map->bucket_count - 1); |
| 3578 | bucket = map->buckets[idx]; |
| 3579 | for (map_e = bucket; map_e; map_e = map_e->next) |
| 3580 | { |
| 3581 | if (is_same_value (&map_e->val, val)) |
| 3582 | return map_e; |
| 3583 | } |
| 3584 | return NULL; |
| 3585 | } |
| 3586 | |
| 3587 | |
| 3588 | /* Record a new literal value. It is illegal to call this if VALUE |
| 3589 | already has an entry here. */ |
| 3590 | |
| 3591 | static value_map * |
| 3592 | add_value_map (map, val, loc) |
| 3593 | value_map_hash_table *map; |
| 3594 | const literal_value *val; |
| 3595 | const r_reloc *loc; |
| 3596 | { |
| 3597 | value_map **bucket_p; |
| 3598 | unsigned idx; |
| 3599 | |
| 3600 | value_map *val_e = (value_map *) bfd_zmalloc (sizeof (value_map)); |
| 3601 | |
| 3602 | BFD_ASSERT (get_cached_value (map, val) == NULL); |
| 3603 | val_e->val = *val; |
| 3604 | val_e->loc = *loc; |
| 3605 | |
| 3606 | idx = hash_literal_value (val); |
| 3607 | idx = idx & (map->bucket_count - 1); |
| 3608 | bucket_p = &map->buckets[idx]; |
| 3609 | |
| 3610 | val_e->next = *bucket_p; |
| 3611 | *bucket_p = val_e; |
| 3612 | map->count++; |
| 3613 | /* FIXME: consider resizing the hash table if we get too many entries */ |
| 3614 | |
| 3615 | return val_e; |
| 3616 | } |
| 3617 | |
| 3618 | \f |
| 3619 | /* Lists of literals being coalesced or removed. */ |
| 3620 | |
| 3621 | /* In the usual case, the literal identified by "from" is being |
| 3622 | coalesced with another literal identified by "to". If the literal is |
| 3623 | unused and is being removed altogether, "to.abfd" will be NULL. |
| 3624 | The removed_literal entries are kept on a per-section list, sorted |
| 3625 | by the "from" offset field. */ |
| 3626 | |
| 3627 | typedef struct removed_literal_struct removed_literal; |
| 3628 | typedef struct removed_literal_list_struct removed_literal_list; |
| 3629 | |
| 3630 | struct removed_literal_struct |
| 3631 | { |
| 3632 | r_reloc from; |
| 3633 | r_reloc to; |
| 3634 | removed_literal *next; |
| 3635 | }; |
| 3636 | |
| 3637 | struct removed_literal_list_struct |
| 3638 | { |
| 3639 | removed_literal *head; |
| 3640 | removed_literal *tail; |
| 3641 | }; |
| 3642 | |
| 3643 | |
| 3644 | static void add_removed_literal |
| 3645 | PARAMS ((removed_literal_list *, const r_reloc *, const r_reloc *)); |
| 3646 | static removed_literal *find_removed_literal |
| 3647 | PARAMS ((removed_literal_list *, bfd_vma)); |
| 3648 | static bfd_vma offset_with_removed_literals |
| 3649 | PARAMS ((removed_literal_list *, bfd_vma)); |
| 3650 | |
| 3651 | |
| 3652 | /* Record that the literal at "from" is being removed. If "to" is not |
| 3653 | NULL, the "from" literal is being coalesced with the "to" literal. */ |
| 3654 | |
| 3655 | static void |
| 3656 | add_removed_literal (removed_list, from, to) |
| 3657 | removed_literal_list *removed_list; |
| 3658 | const r_reloc *from; |
| 3659 | const r_reloc *to; |
| 3660 | { |
| 3661 | removed_literal *r, *new_r, *next_r; |
| 3662 | |
| 3663 | new_r = (removed_literal *) bfd_zmalloc (sizeof (removed_literal)); |
| 3664 | |
| 3665 | new_r->from = *from; |
| 3666 | if (to) |
| 3667 | new_r->to = *to; |
| 3668 | else |
| 3669 | new_r->to.abfd = NULL; |
| 3670 | new_r->next = NULL; |
| 3671 | |
| 3672 | r = removed_list->head; |
| 3673 | if (r == NULL) |
| 3674 | { |
| 3675 | removed_list->head = new_r; |
| 3676 | removed_list->tail = new_r; |
| 3677 | } |
| 3678 | /* Special check for common case of append. */ |
| 3679 | else if (removed_list->tail->from.target_offset < from->target_offset) |
| 3680 | { |
| 3681 | removed_list->tail->next = new_r; |
| 3682 | removed_list->tail = new_r; |
| 3683 | } |
| 3684 | else |
| 3685 | { |
| 3686 | while (r->from.target_offset < from->target_offset |
| 3687 | && r->next != NULL) |
| 3688 | { |
| 3689 | r = r->next; |
| 3690 | } |
| 3691 | next_r = r->next; |
| 3692 | r->next = new_r; |
| 3693 | new_r->next = next_r; |
| 3694 | if (next_r == NULL) |
| 3695 | removed_list->tail = new_r; |
| 3696 | } |
| 3697 | } |
| 3698 | |
| 3699 | |
| 3700 | /* Check if the list of removed literals contains an entry for the |
| 3701 | given address. Return the entry if found. */ |
| 3702 | |
| 3703 | static removed_literal * |
| 3704 | find_removed_literal (removed_list, addr) |
| 3705 | removed_literal_list *removed_list; |
| 3706 | bfd_vma addr; |
| 3707 | { |
| 3708 | removed_literal *r = removed_list->head; |
| 3709 | while (r && r->from.target_offset < addr) |
| 3710 | r = r->next; |
| 3711 | if (r && r->from.target_offset == addr) |
| 3712 | return r; |
| 3713 | return NULL; |
| 3714 | } |
| 3715 | |
| 3716 | |
| 3717 | /* Adjust an offset in a section to compensate for literals that are |
| 3718 | being removed. Search the list of removed literals and subtract |
| 3719 | 4 bytes for every removed literal prior to the given address. */ |
| 3720 | |
| 3721 | static bfd_vma |
| 3722 | offset_with_removed_literals (removed_list, addr) |
| 3723 | removed_literal_list *removed_list; |
| 3724 | bfd_vma addr; |
| 3725 | { |
| 3726 | removed_literal *r = removed_list->head; |
| 3727 | unsigned num_bytes = 0; |
| 3728 | |
| 3729 | if (r == NULL) |
| 3730 | return addr; |
| 3731 | |
| 3732 | while (r && r->from.target_offset <= addr) |
| 3733 | { |
| 3734 | num_bytes += 4; |
| 3735 | r = r->next; |
| 3736 | } |
| 3737 | if (num_bytes > addr) |
| 3738 | return 0; |
| 3739 | return (addr - num_bytes); |
| 3740 | } |
| 3741 | |
| 3742 | \f |
| 3743 | /* Coalescing literals may require a relocation to refer to a section in |
| 3744 | a different input file, but the standard relocation information |
| 3745 | cannot express that. Instead, the reloc_bfd_fix structures are used |
| 3746 | to "fix" the relocations that refer to sections in other input files. |
| 3747 | These structures are kept on per-section lists. The "src_type" field |
| 3748 | records the relocation type in case there are multiple relocations on |
| 3749 | the same location. FIXME: This is ugly; an alternative might be to |
| 3750 | add new symbols with the "owner" field to some other input file. */ |
| 3751 | |
| 3752 | typedef struct reloc_bfd_fix_struct reloc_bfd_fix; |
| 3753 | |
| 3754 | struct reloc_bfd_fix_struct |
| 3755 | { |
| 3756 | asection *src_sec; |
| 3757 | bfd_vma src_offset; |
| 3758 | unsigned src_type; /* Relocation type. */ |
| 3759 | |
| 3760 | bfd *target_abfd; |
| 3761 | asection *target_sec; |
| 3762 | bfd_vma target_offset; |
| 3763 | |
| 3764 | reloc_bfd_fix *next; |
| 3765 | }; |
| 3766 | |
| 3767 | |
| 3768 | static reloc_bfd_fix *reloc_bfd_fix_init |
| 3769 | PARAMS ((asection *, bfd_vma, unsigned, bfd *, asection *, bfd_vma)); |
| 3770 | static reloc_bfd_fix *get_bfd_fix |
| 3771 | PARAMS ((reloc_bfd_fix *, asection *, bfd_vma, unsigned)); |
| 3772 | |
| 3773 | |
| 3774 | static reloc_bfd_fix * |
| 3775 | reloc_bfd_fix_init (src_sec, src_offset, src_type, |
| 3776 | target_abfd, target_sec, target_offset) |
| 3777 | asection *src_sec; |
| 3778 | bfd_vma src_offset; |
| 3779 | unsigned src_type; |
| 3780 | bfd *target_abfd; |
| 3781 | asection *target_sec; |
| 3782 | bfd_vma target_offset; |
| 3783 | { |
| 3784 | reloc_bfd_fix *fix; |
| 3785 | |
| 3786 | fix = (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix)); |
| 3787 | fix->src_sec = src_sec; |
| 3788 | fix->src_offset = src_offset; |
| 3789 | fix->src_type = src_type; |
| 3790 | fix->target_abfd = target_abfd; |
| 3791 | fix->target_sec = target_sec; |
| 3792 | fix->target_offset = target_offset; |
| 3793 | |
| 3794 | return fix; |
| 3795 | } |
| 3796 | |
| 3797 | |
| 3798 | static reloc_bfd_fix * |
| 3799 | get_bfd_fix (fix_list, sec, offset, type) |
| 3800 | reloc_bfd_fix *fix_list; |
| 3801 | asection *sec; |
| 3802 | bfd_vma offset; |
| 3803 | unsigned type; |
| 3804 | { |
| 3805 | reloc_bfd_fix *r; |
| 3806 | |
| 3807 | for (r = fix_list; r != NULL; r = r->next) |
| 3808 | { |
| 3809 | if (r->src_sec == sec |
| 3810 | && r->src_offset == offset |
| 3811 | && r->src_type == type) |
| 3812 | return r; |
| 3813 | } |
| 3814 | return NULL; |
| 3815 | } |
| 3816 | |
| 3817 | \f |
| 3818 | /* Per-section data for relaxation. */ |
| 3819 | |
| 3820 | struct xtensa_relax_info_struct |
| 3821 | { |
| 3822 | bfd_boolean is_relaxable_literal_section; |
| 3823 | int visited; /* Number of times visited. */ |
| 3824 | |
| 3825 | source_reloc *src_relocs; /* Array[src_count]. */ |
| 3826 | int src_count; |
| 3827 | int src_next; /* Next src_relocs entry to assign. */ |
| 3828 | |
| 3829 | removed_literal_list removed_list; |
| 3830 | |
| 3831 | reloc_bfd_fix *fix_list; |
| 3832 | }; |
| 3833 | |
| 3834 | struct elf_xtensa_section_data |
| 3835 | { |
| 3836 | struct bfd_elf_section_data elf; |
| 3837 | xtensa_relax_info relax_info; |
| 3838 | }; |
| 3839 | |
| 3840 | static void init_xtensa_relax_info |
| 3841 | PARAMS ((asection *)); |
| 3842 | static xtensa_relax_info *get_xtensa_relax_info |
| 3843 | PARAMS ((asection *)); |
| 3844 | static void add_fix |
| 3845 | PARAMS ((asection *, reloc_bfd_fix *)); |
| 3846 | |
| 3847 | |
| 3848 | static bfd_boolean |
| 3849 | elf_xtensa_new_section_hook (abfd, sec) |
| 3850 | bfd *abfd; |
| 3851 | asection *sec; |
| 3852 | { |
| 3853 | struct elf_xtensa_section_data *sdata; |
| 3854 | bfd_size_type amt = sizeof (*sdata); |
| 3855 | |
| 3856 | sdata = (struct elf_xtensa_section_data *) bfd_zalloc (abfd, amt); |
| 3857 | if (sdata == NULL) |
| 3858 | return FALSE; |
| 3859 | sec->used_by_bfd = (PTR) sdata; |
| 3860 | |
| 3861 | return _bfd_elf_new_section_hook (abfd, sec); |
| 3862 | } |
| 3863 | |
| 3864 | |
| 3865 | static void |
| 3866 | init_xtensa_relax_info (sec) |
| 3867 | asection *sec; |
| 3868 | { |
| 3869 | xtensa_relax_info *relax_info = get_xtensa_relax_info (sec); |
| 3870 | |
| 3871 | relax_info->is_relaxable_literal_section = FALSE; |
| 3872 | relax_info->visited = 0; |
| 3873 | |
| 3874 | relax_info->src_relocs = NULL; |
| 3875 | relax_info->src_count = 0; |
| 3876 | relax_info->src_next = 0; |
| 3877 | |
| 3878 | relax_info->removed_list.head = NULL; |
| 3879 | relax_info->removed_list.tail = NULL; |
| 3880 | |
| 3881 | relax_info->fix_list = NULL; |
| 3882 | } |
| 3883 | |
| 3884 | |
| 3885 | static xtensa_relax_info * |
| 3886 | get_xtensa_relax_info (sec) |
| 3887 | asection *sec; |
| 3888 | { |
| 3889 | struct elf_xtensa_section_data *section_data; |
| 3890 | |
| 3891 | /* No info available if no section or if it is an output section. */ |
| 3892 | if (!sec || sec == sec->output_section) |
| 3893 | return NULL; |
| 3894 | |
| 3895 | section_data = (struct elf_xtensa_section_data *) elf_section_data (sec); |
| 3896 | return §ion_data->relax_info; |
| 3897 | } |
| 3898 | |
| 3899 | |
| 3900 | static void |
| 3901 | add_fix (src_sec, fix) |
| 3902 | asection *src_sec; |
| 3903 | reloc_bfd_fix *fix; |
| 3904 | { |
| 3905 | xtensa_relax_info *relax_info; |
| 3906 | |
| 3907 | relax_info = get_xtensa_relax_info (src_sec); |
| 3908 | fix->next = relax_info->fix_list; |
| 3909 | relax_info->fix_list = fix; |
| 3910 | } |
| 3911 | |
| 3912 | \f |
| 3913 | /* Access to internal relocations, section contents and symbols. */ |
| 3914 | |
| 3915 | /* During relaxation, we need to modify relocations, section contents, |
| 3916 | and symbol definitions, and we need to keep the original values from |
| 3917 | being reloaded from the input files, i.e., we need to "pin" the |
| 3918 | modified values in memory. We also want to continue to observe the |
| 3919 | setting of the "keep-memory" flag. The following functions wrap the |
| 3920 | standard BFD functions to take care of this for us. */ |
| 3921 | |
| 3922 | static Elf_Internal_Rela * |
| 3923 | retrieve_internal_relocs (abfd, sec, keep_memory) |
| 3924 | bfd *abfd; |
| 3925 | asection *sec; |
| 3926 | bfd_boolean keep_memory; |
| 3927 | { |
| 3928 | Elf_Internal_Rela *internal_relocs; |
| 3929 | |
| 3930 | if ((sec->flags & SEC_LINKER_CREATED) != 0) |
| 3931 | return NULL; |
| 3932 | |
| 3933 | internal_relocs = elf_section_data (sec)->relocs; |
| 3934 | if (internal_relocs == NULL) |
| 3935 | internal_relocs = (_bfd_elf_link_read_relocs |
| 3936 | (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL, |
| 3937 | keep_memory)); |
| 3938 | return internal_relocs; |
| 3939 | } |
| 3940 | |
| 3941 | |
| 3942 | static void |
| 3943 | pin_internal_relocs (sec, internal_relocs) |
| 3944 | asection *sec; |
| 3945 | Elf_Internal_Rela *internal_relocs; |
| 3946 | { |
| 3947 | elf_section_data (sec)->relocs = internal_relocs; |
| 3948 | } |
| 3949 | |
| 3950 | |
| 3951 | static void |
| 3952 | release_internal_relocs (sec, internal_relocs) |
| 3953 | asection *sec; |
| 3954 | Elf_Internal_Rela *internal_relocs; |
| 3955 | { |
| 3956 | if (internal_relocs |
| 3957 | && elf_section_data (sec)->relocs != internal_relocs) |
| 3958 | free (internal_relocs); |
| 3959 | } |
| 3960 | |
| 3961 | |
| 3962 | static bfd_byte * |
| 3963 | retrieve_contents (abfd, sec, keep_memory) |
| 3964 | bfd *abfd; |
| 3965 | asection *sec; |
| 3966 | bfd_boolean keep_memory; |
| 3967 | { |
| 3968 | bfd_byte *contents; |
| 3969 | |
| 3970 | contents = elf_section_data (sec)->this_hdr.contents; |
| 3971 | |
| 3972 | if (contents == NULL && sec->_raw_size != 0) |
| 3973 | { |
| 3974 | contents = (bfd_byte *) bfd_malloc (sec->_raw_size); |
| 3975 | if (contents != NULL) |
| 3976 | { |
| 3977 | if (! bfd_get_section_contents (abfd, sec, contents, |
| 3978 | (file_ptr) 0, sec->_raw_size)) |
| 3979 | { |
| 3980 | free (contents); |
| 3981 | return NULL; |
| 3982 | } |
| 3983 | if (keep_memory) |
| 3984 | elf_section_data (sec)->this_hdr.contents = contents; |
| 3985 | } |
| 3986 | } |
| 3987 | return contents; |
| 3988 | } |
| 3989 | |
| 3990 | |
| 3991 | static void |
| 3992 | pin_contents (sec, contents) |
| 3993 | asection *sec; |
| 3994 | bfd_byte *contents; |
| 3995 | { |
| 3996 | elf_section_data (sec)->this_hdr.contents = contents; |
| 3997 | } |
| 3998 | |
| 3999 | |
| 4000 | static void |
| 4001 | release_contents (sec, contents) |
| 4002 | asection *sec; |
| 4003 | bfd_byte *contents; |
| 4004 | { |
| 4005 | if (contents && |
| 4006 | elf_section_data (sec)->this_hdr.contents != contents) |
| 4007 | free (contents); |
| 4008 | } |
| 4009 | |
| 4010 | |
| 4011 | static Elf_Internal_Sym * |
| 4012 | retrieve_local_syms (input_bfd) |
| 4013 | bfd *input_bfd; |
| 4014 | { |
| 4015 | Elf_Internal_Shdr *symtab_hdr; |
| 4016 | Elf_Internal_Sym *isymbuf; |
| 4017 | size_t locsymcount; |
| 4018 | |
| 4019 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 4020 | locsymcount = symtab_hdr->sh_info; |
| 4021 | |
| 4022 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| 4023 | if (isymbuf == NULL && locsymcount != 0) |
| 4024 | isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0, |
| 4025 | NULL, NULL, NULL); |
| 4026 | |
| 4027 | /* Save the symbols for this input file so they won't be read again. */ |
| 4028 | if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents) |
| 4029 | symtab_hdr->contents = (unsigned char *) isymbuf; |
| 4030 | |
| 4031 | return isymbuf; |
| 4032 | } |
| 4033 | |
| 4034 | \f |
| 4035 | /* Code for link-time relaxation. */ |
| 4036 | |
| 4037 | /* Local helper functions. */ |
| 4038 | static bfd_boolean analyze_relocations |
| 4039 | PARAMS ((struct bfd_link_info *)); |
| 4040 | static bfd_boolean find_relaxable_sections |
| 4041 | PARAMS ((bfd *, asection *, struct bfd_link_info *, bfd_boolean *)); |
| 4042 | static bfd_boolean collect_source_relocs |
| 4043 | PARAMS ((bfd *, asection *, struct bfd_link_info *)); |
| 4044 | static bfd_boolean is_resolvable_asm_expansion |
| 4045 | PARAMS ((bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, |
| 4046 | struct bfd_link_info *, bfd_boolean *)); |
| 4047 | static bfd_boolean remove_literals |
| 4048 | PARAMS ((bfd *, asection *, struct bfd_link_info *, value_map_hash_table *)); |
| 4049 | static bfd_boolean relax_section |
| 4050 | PARAMS ((bfd *, asection *, struct bfd_link_info *)); |
| 4051 | static bfd_boolean relax_property_section |
| 4052 | PARAMS ((bfd *, asection *, struct bfd_link_info *)); |
| 4053 | static bfd_boolean relax_section_symbols |
| 4054 | PARAMS ((bfd *, asection *)); |
| 4055 | static bfd_boolean relocations_reach |
| 4056 | PARAMS ((source_reloc *, int, const r_reloc *)); |
| 4057 | static void translate_reloc |
| 4058 | PARAMS ((const r_reloc *, r_reloc *)); |
| 4059 | static Elf_Internal_Rela *get_irel_at_offset |
| 4060 | PARAMS ((asection *, Elf_Internal_Rela *, bfd_vma)); |
| 4061 | static Elf_Internal_Rela *find_associated_l32r_irel |
| 4062 | PARAMS ((asection *, bfd_byte *, Elf_Internal_Rela *, |
| 4063 | Elf_Internal_Rela *)); |
| 4064 | static void shrink_dynamic_reloc_sections |
| 4065 | PARAMS ((struct bfd_link_info *, bfd *, asection *, Elf_Internal_Rela *)); |
| 4066 | |
| 4067 | |
| 4068 | static bfd_boolean |
| 4069 | elf_xtensa_relax_section (abfd, sec, link_info, again) |
| 4070 | bfd *abfd; |
| 4071 | asection *sec; |
| 4072 | struct bfd_link_info *link_info; |
| 4073 | bfd_boolean *again; |
| 4074 | { |
| 4075 | static value_map_hash_table *values = NULL; |
| 4076 | xtensa_relax_info *relax_info; |
| 4077 | |
| 4078 | if (!values) |
| 4079 | { |
| 4080 | /* Do some overall initialization for relaxation. */ |
| 4081 | values = value_map_hash_table_init (); |
| 4082 | relaxing_section = TRUE; |
| 4083 | if (!analyze_relocations (link_info)) |
| 4084 | return FALSE; |
| 4085 | } |
| 4086 | *again = FALSE; |
| 4087 | |
| 4088 | /* Don't mess with linker-created sections. */ |
| 4089 | if ((sec->flags & SEC_LINKER_CREATED) != 0) |
| 4090 | return TRUE; |
| 4091 | |
| 4092 | relax_info = get_xtensa_relax_info (sec); |
| 4093 | BFD_ASSERT (relax_info != NULL); |
| 4094 | |
| 4095 | switch (relax_info->visited) |
| 4096 | { |
| 4097 | case 0: |
| 4098 | /* Note: It would be nice to fold this pass into |
| 4099 | analyze_relocations, but it is important for this step that the |
| 4100 | sections be examined in link order. */ |
| 4101 | if (!remove_literals (abfd, sec, link_info, values)) |
| 4102 | return FALSE; |
| 4103 | *again = TRUE; |
| 4104 | break; |
| 4105 | |
| 4106 | case 1: |
| 4107 | if (!relax_section (abfd, sec, link_info)) |
| 4108 | return FALSE; |
| 4109 | *again = TRUE; |
| 4110 | break; |
| 4111 | |
| 4112 | case 2: |
| 4113 | if (!relax_section_symbols (abfd, sec)) |
| 4114 | return FALSE; |
| 4115 | break; |
| 4116 | } |
| 4117 | |
| 4118 | relax_info->visited++; |
| 4119 | return TRUE; |
| 4120 | } |
| 4121 | |
| 4122 | /* Initialization for relaxation. */ |
| 4123 | |
| 4124 | /* This function is called once at the start of relaxation. It scans |
| 4125 | all the input sections and marks the ones that are relaxable (i.e., |
| 4126 | literal sections with L32R relocations against them). It then |
| 4127 | collect source_reloc information for all the relocations against |
| 4128 | those relaxable sections. */ |
| 4129 | |
| 4130 | static bfd_boolean |
| 4131 | analyze_relocations (link_info) |
| 4132 | struct bfd_link_info *link_info; |
| 4133 | { |
| 4134 | bfd *abfd; |
| 4135 | asection *sec; |
| 4136 | bfd_boolean is_relaxable = FALSE; |
| 4137 | |
| 4138 | /* Initialize the per-section relaxation info. */ |
| 4139 | for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next) |
| 4140 | for (sec = abfd->sections; sec != NULL; sec = sec->next) |
| 4141 | { |
| 4142 | init_xtensa_relax_info (sec); |
| 4143 | } |
| 4144 | |
| 4145 | /* Mark relaxable sections (and count relocations against each one). */ |
| 4146 | for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next) |
| 4147 | for (sec = abfd->sections; sec != NULL; sec = sec->next) |
| 4148 | { |
| 4149 | if (!find_relaxable_sections (abfd, sec, link_info, &is_relaxable)) |
| 4150 | return FALSE; |
| 4151 | } |
| 4152 | |
| 4153 | /* Bail out if there are no relaxable sections. */ |
| 4154 | if (!is_relaxable) |
| 4155 | return TRUE; |
| 4156 | |
| 4157 | /* Allocate space for source_relocs. */ |
| 4158 | for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next) |
| 4159 | for (sec = abfd->sections; sec != NULL; sec = sec->next) |
| 4160 | { |
| 4161 | xtensa_relax_info *relax_info; |
| 4162 | |
| 4163 | relax_info = get_xtensa_relax_info (sec); |
| 4164 | if (relax_info->is_relaxable_literal_section) |
| 4165 | { |
| 4166 | relax_info->src_relocs = (source_reloc *) |
| 4167 | bfd_malloc (relax_info->src_count * sizeof (source_reloc)); |
| 4168 | } |
| 4169 | } |
| 4170 | |
| 4171 | /* Collect info on relocations against each relaxable section. */ |
| 4172 | for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link_next) |
| 4173 | for (sec = abfd->sections; sec != NULL; sec = sec->next) |
| 4174 | { |
| 4175 | if (!collect_source_relocs (abfd, sec, link_info)) |
| 4176 | return FALSE; |
| 4177 | } |
| 4178 | |
| 4179 | return TRUE; |
| 4180 | } |
| 4181 | |
| 4182 | |
| 4183 | /* Find all the literal sections that might be relaxed. The motivation |
| 4184 | for this pass is that collect_source_relocs() needs to record _all_ |
| 4185 | the relocations that target each relaxable section. That is |
| 4186 | expensive and unnecessary unless the target section is actually going |
| 4187 | to be relaxed. This pass identifies all such sections by checking if |
| 4188 | they have L32Rs pointing to them. In the process, the total number |
| 4189 | of relocations targetting each section is also counted so that we |
| 4190 | know how much space to allocate for source_relocs against each |
| 4191 | relaxable literal section. */ |
| 4192 | |
| 4193 | static bfd_boolean |
| 4194 | find_relaxable_sections (abfd, sec, link_info, is_relaxable_p) |
| 4195 | bfd *abfd; |
| 4196 | asection *sec; |
| 4197 | struct bfd_link_info *link_info; |
| 4198 | bfd_boolean *is_relaxable_p; |
| 4199 | { |
| 4200 | Elf_Internal_Rela *internal_relocs; |
| 4201 | bfd_byte *contents; |
| 4202 | bfd_boolean ok = TRUE; |
| 4203 | unsigned i; |
| 4204 | |
| 4205 | internal_relocs = retrieve_internal_relocs (abfd, sec, |
| 4206 | link_info->keep_memory); |
| 4207 | if (internal_relocs == NULL) |
| 4208 | return ok; |
| 4209 | |
| 4210 | contents = retrieve_contents (abfd, sec, link_info->keep_memory); |
| 4211 | if (contents == NULL && sec->_raw_size != 0) |
| 4212 | { |
| 4213 | ok = FALSE; |
| 4214 | goto error_return; |
| 4215 | } |
| 4216 | |
| 4217 | for (i = 0; i < sec->reloc_count; i++) |
| 4218 | { |
| 4219 | Elf_Internal_Rela *irel = &internal_relocs[i]; |
| 4220 | r_reloc r_rel; |
| 4221 | asection *target_sec; |
| 4222 | xtensa_relax_info *target_relax_info; |
| 4223 | |
| 4224 | r_reloc_init (&r_rel, abfd, irel); |
| 4225 | |
| 4226 | target_sec = r_reloc_get_section (&r_rel); |
| 4227 | target_relax_info = get_xtensa_relax_info (target_sec); |
| 4228 | if (!target_relax_info) |
| 4229 | continue; |
| 4230 | |
| 4231 | /* Count relocations against the target section. */ |
| 4232 | target_relax_info->src_count++; |
| 4233 | |
| 4234 | if (is_literal_section (target_sec) |
| 4235 | && is_l32r_relocation (sec, contents, irel) |
| 4236 | && r_reloc_is_defined (&r_rel)) |
| 4237 | { |
| 4238 | /* Mark the target section as relaxable. */ |
| 4239 | target_relax_info->is_relaxable_literal_section = TRUE; |
| 4240 | *is_relaxable_p = TRUE; |
| 4241 | } |
| 4242 | } |
| 4243 | |
| 4244 | error_return: |
| 4245 | release_contents (sec, contents); |
| 4246 | release_internal_relocs (sec, internal_relocs); |
| 4247 | return ok; |
| 4248 | } |
| 4249 | |
| 4250 | |
| 4251 | /* Record _all_ the relocations that point to relaxable literal |
| 4252 | sections, and get rid of ASM_EXPAND relocs by either converting them |
| 4253 | to ASM_SIMPLIFY or by removing them. */ |
| 4254 | |
| 4255 | static bfd_boolean |
| 4256 | collect_source_relocs (abfd, sec, link_info) |
| 4257 | bfd *abfd; |
| 4258 | asection *sec; |
| 4259 | struct bfd_link_info *link_info; |
| 4260 | { |
| 4261 | Elf_Internal_Rela *internal_relocs; |
| 4262 | bfd_byte *contents; |
| 4263 | bfd_boolean ok = TRUE; |
| 4264 | unsigned i; |
| 4265 | |
| 4266 | internal_relocs = retrieve_internal_relocs (abfd, sec, |
| 4267 | link_info->keep_memory); |
| 4268 | if (internal_relocs == NULL) |
| 4269 | return ok; |
| 4270 | |
| 4271 | contents = retrieve_contents (abfd, sec, link_info->keep_memory); |
| 4272 | if (contents == NULL && sec->_raw_size != 0) |
| 4273 | { |
| 4274 | ok = FALSE; |
| 4275 | goto error_return; |
| 4276 | } |
| 4277 | |
| 4278 | /* Record relocations against relaxable literal sections. */ |
| 4279 | for (i = 0; i < sec->reloc_count; i++) |
| 4280 | { |
| 4281 | Elf_Internal_Rela *irel = &internal_relocs[i]; |
| 4282 | r_reloc r_rel; |
| 4283 | asection *target_sec; |
| 4284 | xtensa_relax_info *target_relax_info; |
| 4285 | |
| 4286 | r_reloc_init (&r_rel, abfd, irel); |
| 4287 | |
| 4288 | target_sec = r_reloc_get_section (&r_rel); |
| 4289 | target_relax_info = get_xtensa_relax_info (target_sec); |
| 4290 | |
| 4291 | if (target_relax_info |
| 4292 | && target_relax_info->is_relaxable_literal_section) |
| 4293 | { |
| 4294 | xtensa_opcode opcode; |
| 4295 | xtensa_operand opnd; |
| 4296 | source_reloc *s_reloc; |
| 4297 | int src_next; |
| 4298 | |
| 4299 | src_next = target_relax_info->src_next++; |
| 4300 | s_reloc = &target_relax_info->src_relocs[src_next]; |
| 4301 | |
| 4302 | opcode = get_relocation_opcode (sec, contents, irel); |
| 4303 | if (opcode == XTENSA_UNDEFINED) |
| 4304 | opnd = NULL; |
| 4305 | else |
| 4306 | opnd = xtensa_get_operand (xtensa_default_isa, opcode, |
| 4307 | get_relocation_opnd (irel)); |
| 4308 | |
| 4309 | init_source_reloc (s_reloc, sec, &r_rel, opnd); |
| 4310 | } |
| 4311 | } |
| 4312 | |
| 4313 | /* Now get rid of ASM_EXPAND relocations. At this point, the |
| 4314 | src_relocs array for the target literal section may still be |
| 4315 | incomplete, but it must at least contain the entries for the L32R |
| 4316 | relocations associated with ASM_EXPANDs because they were just |
| 4317 | added in the preceding loop over the relocations. */ |
| 4318 | |
| 4319 | for (i = 0; i < sec->reloc_count; i++) |
| 4320 | { |
| 4321 | Elf_Internal_Rela *irel = &internal_relocs[i]; |
| 4322 | bfd_boolean is_reachable; |
| 4323 | |
| 4324 | if (!is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info, |
| 4325 | &is_reachable)) |
| 4326 | continue; |
| 4327 | |
| 4328 | if (is_reachable) |
| 4329 | { |
| 4330 | Elf_Internal_Rela *l32r_irel; |
| 4331 | r_reloc r_rel; |
| 4332 | asection *target_sec; |
| 4333 | xtensa_relax_info *target_relax_info; |
| 4334 | |
| 4335 | /* Mark the source_reloc for the L32R so that it will be |
| 4336 | removed in remove_literals(), along with the associated |
| 4337 | literal. */ |
| 4338 | l32r_irel = find_associated_l32r_irel (sec, contents, |
| 4339 | irel, internal_relocs); |
| 4340 | if (l32r_irel == NULL) |
| 4341 | continue; |
| 4342 | |
| 4343 | r_reloc_init (&r_rel, abfd, l32r_irel); |
| 4344 | |
| 4345 | target_sec = r_reloc_get_section (&r_rel); |
| 4346 | target_relax_info = get_xtensa_relax_info (target_sec); |
| 4347 | |
| 4348 | if (target_relax_info |
| 4349 | && target_relax_info->is_relaxable_literal_section) |
| 4350 | { |
| 4351 | source_reloc *s_reloc; |
| 4352 | |
| 4353 | /* Search the source_relocs for the entry corresponding to |
| 4354 | the l32r_irel. Note: The src_relocs array is not yet |
| 4355 | sorted, but it wouldn't matter anyway because we're |
| 4356 | searching by source offset instead of target offset. */ |
| 4357 | s_reloc = find_source_reloc (target_relax_info->src_relocs, |
| 4358 | target_relax_info->src_next, |
| 4359 | sec, l32r_irel); |
| 4360 | BFD_ASSERT (s_reloc); |
| 4361 | s_reloc->is_null = TRUE; |
| 4362 | } |
| 4363 | |
| 4364 | /* Convert this reloc to ASM_SIMPLIFY. */ |
| 4365 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| 4366 | R_XTENSA_ASM_SIMPLIFY); |
| 4367 | l32r_irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); |
| 4368 | |
| 4369 | pin_internal_relocs (sec, internal_relocs); |
| 4370 | } |
| 4371 | else |
| 4372 | { |
| 4373 | /* It is resolvable but doesn't reach. We resolve now |
| 4374 | by eliminating the relocation -- the call will remain |
| 4375 | expanded into L32R/CALLX. */ |
| 4376 | irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); |
| 4377 | pin_internal_relocs (sec, internal_relocs); |
| 4378 | } |
| 4379 | } |
| 4380 | |
| 4381 | error_return: |
| 4382 | release_contents (sec, contents); |
| 4383 | release_internal_relocs (sec, internal_relocs); |
| 4384 | return ok; |
| 4385 | } |
| 4386 | |
| 4387 | |
| 4388 | /* Return TRUE if the asm expansion can be resolved. Generally it can |
| 4389 | be resolved on a final link or when a partial link locates it in the |
| 4390 | same section as the target. Set "is_reachable" flag if the target of |
| 4391 | the call is within the range of a direct call, given the current VMA |
| 4392 | for this section and the target section. */ |
| 4393 | |
| 4394 | bfd_boolean |
| 4395 | is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info, |
| 4396 | is_reachable_p) |
| 4397 | bfd *abfd; |
| 4398 | asection *sec; |
| 4399 | bfd_byte *contents; |
| 4400 | Elf_Internal_Rela *irel; |
| 4401 | struct bfd_link_info *link_info; |
| 4402 | bfd_boolean *is_reachable_p; |
| 4403 | { |
| 4404 | asection *target_sec; |
| 4405 | bfd_vma target_offset; |
| 4406 | r_reloc r_rel; |
| 4407 | xtensa_opcode opcode, direct_call_opcode; |
| 4408 | bfd_vma self_address; |
| 4409 | bfd_vma dest_address; |
| 4410 | |
| 4411 | *is_reachable_p = FALSE; |
| 4412 | |
| 4413 | if (contents == NULL) |
| 4414 | return FALSE; |
| 4415 | |
| 4416 | if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_EXPAND) |
| 4417 | return FALSE; |
| 4418 | |
| 4419 | opcode = get_expanded_call_opcode (contents + irel->r_offset, |
| 4420 | sec->_raw_size - irel->r_offset); |
| 4421 | |
| 4422 | direct_call_opcode = swap_callx_for_call_opcode (opcode); |
| 4423 | if (direct_call_opcode == XTENSA_UNDEFINED) |
| 4424 | return FALSE; |
| 4425 | |
| 4426 | /* Check and see that the target resolves. */ |
| 4427 | r_reloc_init (&r_rel, abfd, irel); |
| 4428 | if (!r_reloc_is_defined (&r_rel)) |
| 4429 | return FALSE; |
| 4430 | |
| 4431 | target_sec = r_reloc_get_section (&r_rel); |
| 4432 | target_offset = r_reloc_get_target_offset (&r_rel); |
| 4433 | |
| 4434 | /* If the target is in a shared library, then it doesn't reach. This |
| 4435 | isn't supposed to come up because the compiler should never generate |
| 4436 | non-PIC calls on systems that use shared libraries, but the linker |
| 4437 | shouldn't crash regardless. */ |
| 4438 | if (!target_sec->output_section) |
| 4439 | return FALSE; |
| 4440 | |
| 4441 | /* For relocatable sections, we can only simplify when the output |
| 4442 | section of the target is the same as the output section of the |
| 4443 | source. */ |
| 4444 | if (link_info->relocatable |
| 4445 | && (target_sec->output_section != sec->output_section)) |
| 4446 | return FALSE; |
| 4447 | |
| 4448 | self_address = (sec->output_section->vma |
| 4449 | + sec->output_offset + irel->r_offset + 3); |
| 4450 | dest_address = (target_sec->output_section->vma |
| 4451 | + target_sec->output_offset + target_offset); |
| 4452 | |
| 4453 | *is_reachable_p = pcrel_reloc_fits |
| 4454 | (xtensa_get_operand (xtensa_default_isa, direct_call_opcode, 0), |
| 4455 | self_address, dest_address); |
| 4456 | |
| 4457 | if ((self_address >> CALL_SEGMENT_BITS) != |
| 4458 | (dest_address >> CALL_SEGMENT_BITS)) |
| 4459 | return FALSE; |
| 4460 | |
| 4461 | return TRUE; |
| 4462 | } |
| 4463 | |
| 4464 | |
| 4465 | static Elf_Internal_Rela * |
| 4466 | find_associated_l32r_irel (sec, contents, other_irel, internal_relocs) |
| 4467 | asection *sec; |
| 4468 | bfd_byte *contents; |
| 4469 | Elf_Internal_Rela *other_irel; |
| 4470 | Elf_Internal_Rela *internal_relocs; |
| 4471 | { |
| 4472 | unsigned i; |
| 4473 | |
| 4474 | for (i = 0; i < sec->reloc_count; i++) |
| 4475 | { |
| 4476 | Elf_Internal_Rela *irel = &internal_relocs[i]; |
| 4477 | |
| 4478 | if (irel == other_irel) |
| 4479 | continue; |
| 4480 | if (irel->r_offset != other_irel->r_offset) |
| 4481 | continue; |
| 4482 | if (is_l32r_relocation (sec, contents, irel)) |
| 4483 | return irel; |
| 4484 | } |
| 4485 | |
| 4486 | return NULL; |
| 4487 | } |
| 4488 | |
| 4489 | /* First relaxation pass. */ |
| 4490 | |
| 4491 | /* If the section is relaxable (i.e., a literal section), check each |
| 4492 | literal to see if it has the same value as another literal that has |
| 4493 | already been seen, either in the current section or a previous one. |
| 4494 | If so, add an entry to the per-section list of removed literals. The |
| 4495 | actual changes are deferred until the next pass. */ |
| 4496 | |
| 4497 | static bfd_boolean |
| 4498 | remove_literals (abfd, sec, link_info, values) |
| 4499 | bfd *abfd; |
| 4500 | asection *sec; |
| 4501 | struct bfd_link_info *link_info; |
| 4502 | value_map_hash_table *values; |
| 4503 | { |
| 4504 | xtensa_relax_info *relax_info; |
| 4505 | bfd_byte *contents; |
| 4506 | Elf_Internal_Rela *internal_relocs; |
| 4507 | source_reloc *src_relocs; |
| 4508 | bfd_boolean ok = TRUE; |
| 4509 | int i; |
| 4510 | |
| 4511 | /* Do nothing if it is not a relaxable literal section. */ |
| 4512 | relax_info = get_xtensa_relax_info (sec); |
| 4513 | BFD_ASSERT (relax_info); |
| 4514 | |
| 4515 | if (!relax_info->is_relaxable_literal_section) |
| 4516 | return ok; |
| 4517 | |
| 4518 | internal_relocs = retrieve_internal_relocs (abfd, sec, |
| 4519 | link_info->keep_memory); |
| 4520 | |
| 4521 | contents = retrieve_contents (abfd, sec, link_info->keep_memory); |
| 4522 | if (contents == NULL && sec->_raw_size != 0) |
| 4523 | { |
| 4524 | ok = FALSE; |
| 4525 | goto error_return; |
| 4526 | } |
| 4527 | |
| 4528 | /* Sort the source_relocs by target offset. */ |
| 4529 | src_relocs = relax_info->src_relocs; |
| 4530 | qsort (src_relocs, relax_info->src_count, |
| 4531 | sizeof (source_reloc), source_reloc_compare); |
| 4532 | |
| 4533 | for (i = 0; i < relax_info->src_count; i++) |
| 4534 | { |
| 4535 | source_reloc *rel; |
| 4536 | Elf_Internal_Rela *irel = NULL; |
| 4537 | literal_value val; |
| 4538 | value_map *val_map; |
| 4539 | |
| 4540 | rel = &src_relocs[i]; |
| 4541 | irel = get_irel_at_offset (sec, internal_relocs, |
| 4542 | rel->r_rel.target_offset); |
| 4543 | |
| 4544 | /* If the target_offset for this relocation is the same as the |
| 4545 | previous relocation, then we've already considered whether the |
| 4546 | literal can be coalesced. Skip to the next one.... */ |
| 4547 | if (i != 0 && (src_relocs[i-1].r_rel.target_offset |
| 4548 | == rel->r_rel.target_offset)) |
| 4549 | continue; |
| 4550 | |
| 4551 | /* Check if the relocation was from an L32R that is being removed |
| 4552 | because a CALLX was converted to a direct CALL, and check if |
| 4553 | there are no other relocations to the literal. */ |
| 4554 | if (rel->is_null |
| 4555 | && (i == relax_info->src_count - 1 |
| 4556 | || (src_relocs[i+1].r_rel.target_offset |
| 4557 | != rel->r_rel.target_offset))) |
| 4558 | { |
| 4559 | /* Mark the unused literal so that it will be removed. */ |
| 4560 | add_removed_literal (&relax_info->removed_list, &rel->r_rel, NULL); |
| 4561 | |
| 4562 | /* Zero out the relocation on this literal location. */ |
| 4563 | if (irel) |
| 4564 | { |
| 4565 | if (elf_hash_table (link_info)->dynamic_sections_created) |
| 4566 | shrink_dynamic_reloc_sections (link_info, abfd, sec, irel); |
| 4567 | |
| 4568 | irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); |
| 4569 | } |
| 4570 | |
| 4571 | continue; |
| 4572 | } |
| 4573 | |
| 4574 | /* Find the literal value. */ |
| 4575 | r_reloc_init (&val.r_rel, abfd, irel); |
| 4576 | BFD_ASSERT (rel->r_rel.target_offset < sec->_raw_size); |
| 4577 | val.value = bfd_get_32 (abfd, contents + rel->r_rel.target_offset); |
| 4578 | |
| 4579 | /* Check if we've seen another literal with the same value. */ |
| 4580 | val_map = get_cached_value (values, &val); |
| 4581 | if (val_map != NULL) |
| 4582 | { |
| 4583 | /* First check that THIS and all the other relocs to this |
| 4584 | literal will FIT if we move them to the new address. */ |
| 4585 | |
| 4586 | if (relocations_reach (rel, relax_info->src_count - i, |
| 4587 | &val_map->loc)) |
| 4588 | { |
| 4589 | /* Mark that the literal will be coalesced. */ |
| 4590 | add_removed_literal (&relax_info->removed_list, |
| 4591 | &rel->r_rel, &val_map->loc); |
| 4592 | } |
| 4593 | else |
| 4594 | { |
| 4595 | /* Relocations do not reach -- do not remove this literal. */ |
| 4596 | val_map->loc = rel->r_rel; |
| 4597 | } |
| 4598 | } |
| 4599 | else |
| 4600 | { |
| 4601 | /* This is the first time we've seen this literal value. */ |
| 4602 | BFD_ASSERT (sec == r_reloc_get_section (&rel->r_rel)); |
| 4603 | add_value_map (values, &val, &rel->r_rel); |
| 4604 | } |
| 4605 | } |
| 4606 | |
| 4607 | error_return: |
| 4608 | release_contents (sec, contents); |
| 4609 | release_internal_relocs (sec, internal_relocs); |
| 4610 | return ok; |
| 4611 | } |
| 4612 | |
| 4613 | |
| 4614 | /* Check if the original relocations (presumably on L32R instructions) |
| 4615 | identified by reloc[0..N] can be changed to reference the literal |
| 4616 | identified by r_rel. If r_rel is out of range for any of the |
| 4617 | original relocations, then we don't want to coalesce the original |
| 4618 | literal with the one at r_rel. We only check reloc[0..N], where the |
| 4619 | offsets are all the same as for reloc[0] (i.e., they're all |
| 4620 | referencing the same literal) and where N is also bounded by the |
| 4621 | number of remaining entries in the "reloc" array. The "reloc" array |
| 4622 | is sorted by target offset so we know all the entries for the same |
| 4623 | literal will be contiguous. */ |
| 4624 | |
| 4625 | static bfd_boolean |
| 4626 | relocations_reach (reloc, remaining_relocs, r_rel) |
| 4627 | source_reloc *reloc; |
| 4628 | int remaining_relocs; |
| 4629 | const r_reloc *r_rel; |
| 4630 | { |
| 4631 | bfd_vma from_offset, source_address, dest_address; |
| 4632 | asection *sec; |
| 4633 | int i; |
| 4634 | |
| 4635 | if (!r_reloc_is_defined (r_rel)) |
| 4636 | return FALSE; |
| 4637 | |
| 4638 | sec = r_reloc_get_section (r_rel); |
| 4639 | from_offset = reloc[0].r_rel.target_offset; |
| 4640 | |
| 4641 | for (i = 0; i < remaining_relocs; i++) |
| 4642 | { |
| 4643 | if (reloc[i].r_rel.target_offset != from_offset) |
| 4644 | break; |
| 4645 | |
| 4646 | /* Ignore relocations that have been removed. */ |
| 4647 | if (reloc[i].is_null) |
| 4648 | continue; |
| 4649 | |
| 4650 | /* The original and new output section for these must be the same |
| 4651 | in order to coalesce. */ |
| 4652 | if (r_reloc_get_section (&reloc[i].r_rel)->output_section |
| 4653 | != sec->output_section) |
| 4654 | return FALSE; |
| 4655 | |
| 4656 | /* A NULL operand means it is not a PC-relative relocation, so |
| 4657 | the literal can be moved anywhere. */ |
| 4658 | if (reloc[i].opnd) |
| 4659 | { |
| 4660 | /* Otherwise, check to see that it fits. */ |
| 4661 | source_address = (reloc[i].source_sec->output_section->vma |
| 4662 | + reloc[i].source_sec->output_offset |
| 4663 | + reloc[i].r_rel.rela.r_offset); |
| 4664 | dest_address = (sec->output_section->vma |
| 4665 | + sec->output_offset |
| 4666 | + r_rel->target_offset); |
| 4667 | |
| 4668 | if (!pcrel_reloc_fits (reloc[i].opnd, source_address, dest_address)) |
| 4669 | return FALSE; |
| 4670 | } |
| 4671 | } |
| 4672 | |
| 4673 | return TRUE; |
| 4674 | } |
| 4675 | |
| 4676 | |
| 4677 | /* WARNING: linear search here. If the relocation are in order by |
| 4678 | address, we can use a faster binary search. ALSO, we assume that |
| 4679 | there is only 1 non-NONE relocation per address. */ |
| 4680 | |
| 4681 | static Elf_Internal_Rela * |
| 4682 | get_irel_at_offset (sec, internal_relocs, offset) |
| 4683 | asection *sec; |
| 4684 | Elf_Internal_Rela *internal_relocs; |
| 4685 | bfd_vma offset; |
| 4686 | { |
| 4687 | unsigned i; |
| 4688 | if (!internal_relocs) |
| 4689 | return NULL; |
| 4690 | for (i = 0; i < sec->reloc_count; i++) |
| 4691 | { |
| 4692 | Elf_Internal_Rela *irel = &internal_relocs[i]; |
| 4693 | if (irel->r_offset == offset |
| 4694 | && ELF32_R_TYPE (irel->r_info) != R_XTENSA_NONE) |
| 4695 | return irel; |
| 4696 | } |
| 4697 | return NULL; |
| 4698 | } |
| 4699 | |
| 4700 | \f |
| 4701 | /* Second relaxation pass. */ |
| 4702 | |
| 4703 | /* Modify all of the relocations to point to the right spot, and if this |
| 4704 | is a relaxable section, delete the unwanted literals and fix the |
| 4705 | cooked_size. */ |
| 4706 | |
| 4707 | bfd_boolean |
| 4708 | relax_section (abfd, sec, link_info) |
| 4709 | bfd *abfd; |
| 4710 | asection *sec; |
| 4711 | struct bfd_link_info *link_info; |
| 4712 | { |
| 4713 | Elf_Internal_Rela *internal_relocs; |
| 4714 | xtensa_relax_info *relax_info; |
| 4715 | bfd_byte *contents; |
| 4716 | bfd_boolean ok = TRUE; |
| 4717 | unsigned i; |
| 4718 | |
| 4719 | relax_info = get_xtensa_relax_info (sec); |
| 4720 | BFD_ASSERT (relax_info); |
| 4721 | |
| 4722 | /* Handle property sections (e.g., literal tables) specially. */ |
| 4723 | if (xtensa_is_property_section (sec)) |
| 4724 | { |
| 4725 | BFD_ASSERT (!relax_info->is_relaxable_literal_section); |
| 4726 | return relax_property_section (abfd, sec, link_info); |
| 4727 | } |
| 4728 | |
| 4729 | internal_relocs = retrieve_internal_relocs (abfd, sec, |
| 4730 | link_info->keep_memory); |
| 4731 | contents = retrieve_contents (abfd, sec, link_info->keep_memory); |
| 4732 | if (contents == NULL && sec->_raw_size != 0) |
| 4733 | { |
| 4734 | ok = FALSE; |
| 4735 | goto error_return; |
| 4736 | } |
| 4737 | |
| 4738 | if (internal_relocs) |
| 4739 | { |
| 4740 | for (i = 0; i < sec->reloc_count; i++) |
| 4741 | { |
| 4742 | Elf_Internal_Rela *irel; |
| 4743 | xtensa_relax_info *target_relax_info; |
| 4744 | bfd_vma source_offset; |
| 4745 | r_reloc r_rel; |
| 4746 | unsigned r_type; |
| 4747 | asection *target_sec; |
| 4748 | |
| 4749 | /* Locally change the source address. |
| 4750 | Translate the target to the new target address. |
| 4751 | If it points to this section and has been removed, |
| 4752 | NULLify it. |
| 4753 | Write it back. */ |
| 4754 | |
| 4755 | irel = &internal_relocs[i]; |
| 4756 | source_offset = irel->r_offset; |
| 4757 | |
| 4758 | r_type = ELF32_R_TYPE (irel->r_info); |
| 4759 | r_reloc_init (&r_rel, abfd, irel); |
| 4760 | |
| 4761 | if (relax_info->is_relaxable_literal_section) |
| 4762 | { |
| 4763 | if (r_type != R_XTENSA_NONE |
| 4764 | && find_removed_literal (&relax_info->removed_list, |
| 4765 | irel->r_offset)) |
| 4766 | { |
| 4767 | /* Remove this relocation. */ |
| 4768 | if (elf_hash_table (link_info)->dynamic_sections_created) |
| 4769 | shrink_dynamic_reloc_sections (link_info, abfd, sec, irel); |
| 4770 | irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); |
| 4771 | irel->r_offset = offset_with_removed_literals |
| 4772 | (&relax_info->removed_list, irel->r_offset); |
| 4773 | continue; |
| 4774 | } |
| 4775 | source_offset = |
| 4776 | offset_with_removed_literals (&relax_info->removed_list, |
| 4777 | irel->r_offset); |
| 4778 | irel->r_offset = source_offset; |
| 4779 | } |
| 4780 | |
| 4781 | target_sec = r_reloc_get_section (&r_rel); |
| 4782 | target_relax_info = get_xtensa_relax_info (target_sec); |
| 4783 | |
| 4784 | if (target_relax_info |
| 4785 | && target_relax_info->is_relaxable_literal_section) |
| 4786 | { |
| 4787 | r_reloc new_rel; |
| 4788 | reloc_bfd_fix *fix; |
| 4789 | |
| 4790 | translate_reloc (&r_rel, &new_rel); |
| 4791 | |
| 4792 | /* FIXME: If the relocation still references a section in |
| 4793 | the same input file, the relocation should be modified |
| 4794 | directly instead of adding a "fix" record. */ |
| 4795 | |
| 4796 | fix = reloc_bfd_fix_init (sec, source_offset, r_type, 0, |
| 4797 | r_reloc_get_section (&new_rel), |
| 4798 | new_rel.target_offset); |
| 4799 | add_fix (sec, fix); |
| 4800 | } |
| 4801 | |
| 4802 | pin_internal_relocs (sec, internal_relocs); |
| 4803 | } |
| 4804 | } |
| 4805 | |
| 4806 | if (relax_info->is_relaxable_literal_section) |
| 4807 | { |
| 4808 | /* Walk through the contents and delete literals that are not needed |
| 4809 | anymore. */ |
| 4810 | |
| 4811 | unsigned long size = sec->_cooked_size; |
| 4812 | unsigned long removed = 0; |
| 4813 | |
| 4814 | removed_literal *reloc = relax_info->removed_list.head; |
| 4815 | for (; reloc; reloc = reloc->next) |
| 4816 | { |
| 4817 | unsigned long upper = sec->_raw_size; |
| 4818 | bfd_vma start = reloc->from.target_offset + 4; |
| 4819 | if (reloc->next) |
| 4820 | upper = reloc->next->from.target_offset; |
| 4821 | if (upper - start != 0) |
| 4822 | { |
| 4823 | BFD_ASSERT (start <= upper); |
| 4824 | memmove (contents + start - removed - 4, |
| 4825 | contents + start, |
| 4826 | upper - start ); |
| 4827 | pin_contents (sec, contents); |
| 4828 | } |
| 4829 | removed += 4; |
| 4830 | size -= 4; |
| 4831 | } |
| 4832 | |
| 4833 | /* Change the section size. */ |
| 4834 | sec->_cooked_size = size; |
| 4835 | /* Also shrink _raw_size. (The code in relocate_section that |
| 4836 | checks that relocations are within the section must use |
| 4837 | _raw_size because of the way the stabs sections are relaxed; |
| 4838 | shrinking _raw_size means that these checks will not be |
| 4839 | unnecessarily lax.) */ |
| 4840 | sec->_raw_size = size; |
| 4841 | } |
| 4842 | |
| 4843 | error_return: |
| 4844 | release_internal_relocs (sec, internal_relocs); |
| 4845 | release_contents (sec, contents); |
| 4846 | return ok; |
| 4847 | } |
| 4848 | |
| 4849 | |
| 4850 | /* Fix up a relocation to take account of removed literals. */ |
| 4851 | |
| 4852 | static void |
| 4853 | translate_reloc (orig_rel, new_rel) |
| 4854 | const r_reloc *orig_rel; |
| 4855 | r_reloc *new_rel; |
| 4856 | { |
| 4857 | asection *sec; |
| 4858 | xtensa_relax_info *relax_info; |
| 4859 | removed_literal *removed; |
| 4860 | unsigned long new_offset; |
| 4861 | |
| 4862 | *new_rel = *orig_rel; |
| 4863 | |
| 4864 | if (!r_reloc_is_defined (orig_rel)) |
| 4865 | return; |
| 4866 | sec = r_reloc_get_section (orig_rel); |
| 4867 | |
| 4868 | relax_info = get_xtensa_relax_info (sec); |
| 4869 | BFD_ASSERT (relax_info); |
| 4870 | |
| 4871 | if (!relax_info->is_relaxable_literal_section) |
| 4872 | return; |
| 4873 | |
| 4874 | /* Check if the original relocation is against a literal being removed. */ |
| 4875 | removed = find_removed_literal (&relax_info->removed_list, |
| 4876 | orig_rel->target_offset); |
| 4877 | if (removed) |
| 4878 | { |
| 4879 | asection *new_sec; |
| 4880 | |
| 4881 | /* The fact that there is still a relocation to this literal indicates |
| 4882 | that the literal is being coalesced, not simply removed. */ |
| 4883 | BFD_ASSERT (removed->to.abfd != NULL); |
| 4884 | |
| 4885 | /* This was moved to some other address (possibly in another section). */ |
| 4886 | *new_rel = removed->to; |
| 4887 | new_sec = r_reloc_get_section (new_rel); |
| 4888 | if (new_sec != sec) |
| 4889 | { |
| 4890 | sec = new_sec; |
| 4891 | relax_info = get_xtensa_relax_info (sec); |
| 4892 | if (!relax_info || !relax_info->is_relaxable_literal_section) |
| 4893 | return; |
| 4894 | } |
| 4895 | } |
| 4896 | |
| 4897 | /* ...and the target address may have been moved within its section. */ |
| 4898 | new_offset = offset_with_removed_literals (&relax_info->removed_list, |
| 4899 | new_rel->target_offset); |
| 4900 | |
| 4901 | /* Modify the offset and addend. */ |
| 4902 | new_rel->target_offset = new_offset; |
| 4903 | new_rel->rela.r_addend += (new_offset - new_rel->target_offset); |
| 4904 | } |
| 4905 | |
| 4906 | |
| 4907 | /* For dynamic links, there may be a dynamic relocation for each |
| 4908 | literal. The number of dynamic relocations must be computed in |
| 4909 | size_dynamic_sections, which occurs before relaxation. When a |
| 4910 | literal is removed, this function checks if there is a corresponding |
| 4911 | dynamic relocation and shrinks the size of the appropriate dynamic |
| 4912 | relocation section accordingly. At this point, the contents of the |
| 4913 | dynamic relocation sections have not yet been filled in, so there's |
| 4914 | nothing else that needs to be done. */ |
| 4915 | |
| 4916 | static void |
| 4917 | shrink_dynamic_reloc_sections (info, abfd, input_section, rel) |
| 4918 | struct bfd_link_info *info; |
| 4919 | bfd *abfd; |
| 4920 | asection *input_section; |
| 4921 | Elf_Internal_Rela *rel; |
| 4922 | { |
| 4923 | Elf_Internal_Shdr *symtab_hdr; |
| 4924 | struct elf_link_hash_entry **sym_hashes; |
| 4925 | unsigned long r_symndx; |
| 4926 | int r_type; |
| 4927 | struct elf_link_hash_entry *h; |
| 4928 | bfd_boolean dynamic_symbol; |
| 4929 | |
| 4930 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 4931 | sym_hashes = elf_sym_hashes (abfd); |
| 4932 | |
| 4933 | r_type = ELF32_R_TYPE (rel->r_info); |
| 4934 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 4935 | |
| 4936 | if (r_symndx < symtab_hdr->sh_info) |
| 4937 | h = NULL; |
| 4938 | else |
| 4939 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 4940 | |
| 4941 | dynamic_symbol = xtensa_elf_dynamic_symbol_p (h, info); |
| 4942 | |
| 4943 | if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT) |
| 4944 | && (input_section->flags & SEC_ALLOC) != 0 |
| 4945 | && (dynamic_symbol || info->shared)) |
| 4946 | { |
| 4947 | bfd *dynobj; |
| 4948 | const char *srel_name; |
| 4949 | asection *srel; |
| 4950 | bfd_boolean is_plt = FALSE; |
| 4951 | |
| 4952 | dynobj = elf_hash_table (info)->dynobj; |
| 4953 | BFD_ASSERT (dynobj != NULL); |
| 4954 | |
| 4955 | if (dynamic_symbol && r_type == R_XTENSA_PLT) |
| 4956 | { |
| 4957 | srel_name = ".rela.plt"; |
| 4958 | is_plt = TRUE; |
| 4959 | } |
| 4960 | else |
| 4961 | srel_name = ".rela.got"; |
| 4962 | |
| 4963 | /* Reduce size of the .rela.* section by one reloc. */ |
| 4964 | srel = bfd_get_section_by_name (dynobj, srel_name); |
| 4965 | BFD_ASSERT (srel != NULL); |
| 4966 | BFD_ASSERT (srel->_cooked_size >= sizeof (Elf32_External_Rela)); |
| 4967 | srel->_cooked_size -= sizeof (Elf32_External_Rela); |
| 4968 | |
| 4969 | /* Also shrink _raw_size. (This seems wrong but other bfd code seems |
| 4970 | to assume that linker-created sections will never be relaxed and |
| 4971 | hence _raw_size must always equal _cooked_size.) */ |
| 4972 | srel->_raw_size = srel->_cooked_size; |
| 4973 | |
| 4974 | if (is_plt) |
| 4975 | { |
| 4976 | asection *splt, *sgotplt, *srelgot; |
| 4977 | int reloc_index, chunk; |
| 4978 | |
| 4979 | /* Find the PLT reloc index of the entry being removed. This |
| 4980 | is computed from the size of ".rela.plt". It is needed to |
| 4981 | figure out which PLT chunk to resize. Usually "last index |
| 4982 | = size - 1" since the index starts at zero, but in this |
| 4983 | context, the size has just been decremented so there's no |
| 4984 | need to subtract one. */ |
| 4985 | reloc_index = srel->_cooked_size / sizeof (Elf32_External_Rela); |
| 4986 | |
| 4987 | chunk = reloc_index / PLT_ENTRIES_PER_CHUNK; |
| 4988 | splt = elf_xtensa_get_plt_section (dynobj, chunk); |
| 4989 | sgotplt = elf_xtensa_get_gotplt_section (dynobj, chunk); |
| 4990 | BFD_ASSERT (splt != NULL && sgotplt != NULL); |
| 4991 | |
| 4992 | /* Check if an entire PLT chunk has just been eliminated. */ |
| 4993 | if (reloc_index % PLT_ENTRIES_PER_CHUNK == 0) |
| 4994 | { |
| 4995 | /* The two magic GOT entries for that chunk can go away. */ |
| 4996 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); |
| 4997 | BFD_ASSERT (srelgot != NULL); |
| 4998 | srelgot->reloc_count -= 2; |
| 4999 | srelgot->_cooked_size -= 2 * sizeof (Elf32_External_Rela); |
| 5000 | /* Shrink _raw_size (see comment above). */ |
| 5001 | srelgot->_raw_size = srelgot->_cooked_size; |
| 5002 | |
| 5003 | sgotplt->_cooked_size -= 8; |
| 5004 | |
| 5005 | /* There should be only one entry left (and it will be |
| 5006 | removed below). */ |
| 5007 | BFD_ASSERT (sgotplt->_cooked_size == 4); |
| 5008 | BFD_ASSERT (splt->_cooked_size == PLT_ENTRY_SIZE); |
| 5009 | } |
| 5010 | |
| 5011 | BFD_ASSERT (sgotplt->_cooked_size >= 4); |
| 5012 | BFD_ASSERT (splt->_cooked_size >= PLT_ENTRY_SIZE); |
| 5013 | |
| 5014 | sgotplt->_cooked_size -= 4; |
| 5015 | splt->_cooked_size -= PLT_ENTRY_SIZE; |
| 5016 | |
| 5017 | /* Shrink _raw_sizes (see comment above). */ |
| 5018 | sgotplt->_raw_size = sgotplt->_cooked_size; |
| 5019 | splt->_raw_size = splt->_cooked_size; |
| 5020 | } |
| 5021 | } |
| 5022 | } |
| 5023 | |
| 5024 | |
| 5025 | /* This is similar to relax_section except that when a target is moved, |
| 5026 | we shift addresses up. We also need to modify the size. This |
| 5027 | algorithm does NOT allow for relocations into the middle of the |
| 5028 | property sections. */ |
| 5029 | |
| 5030 | static bfd_boolean |
| 5031 | relax_property_section (abfd, sec, link_info) |
| 5032 | bfd *abfd; |
| 5033 | asection *sec; |
| 5034 | struct bfd_link_info *link_info; |
| 5035 | { |
| 5036 | Elf_Internal_Rela *internal_relocs; |
| 5037 | bfd_byte *contents; |
| 5038 | unsigned i, nexti; |
| 5039 | bfd_boolean ok = TRUE; |
| 5040 | |
| 5041 | internal_relocs = retrieve_internal_relocs (abfd, sec, |
| 5042 | link_info->keep_memory); |
| 5043 | contents = retrieve_contents (abfd, sec, link_info->keep_memory); |
| 5044 | if (contents == NULL && sec->_raw_size != 0) |
| 5045 | { |
| 5046 | ok = FALSE; |
| 5047 | goto error_return; |
| 5048 | } |
| 5049 | |
| 5050 | if (internal_relocs) |
| 5051 | { |
| 5052 | for (i = 0; i < sec->reloc_count; i++) |
| 5053 | { |
| 5054 | Elf_Internal_Rela *irel; |
| 5055 | xtensa_relax_info *target_relax_info; |
| 5056 | r_reloc r_rel; |
| 5057 | unsigned r_type; |
| 5058 | asection *target_sec; |
| 5059 | |
| 5060 | /* Locally change the source address. |
| 5061 | Translate the target to the new target address. |
| 5062 | If it points to this section and has been removed, MOVE IT. |
| 5063 | Also, don't forget to modify the associated SIZE at |
| 5064 | (offset + 4). */ |
| 5065 | |
| 5066 | irel = &internal_relocs[i]; |
| 5067 | r_type = ELF32_R_TYPE (irel->r_info); |
| 5068 | if (r_type == R_XTENSA_NONE) |
| 5069 | continue; |
| 5070 | |
| 5071 | r_reloc_init (&r_rel, abfd, irel); |
| 5072 | |
| 5073 | target_sec = r_reloc_get_section (&r_rel); |
| 5074 | target_relax_info = get_xtensa_relax_info (target_sec); |
| 5075 | |
| 5076 | if (target_relax_info |
| 5077 | && target_relax_info->is_relaxable_literal_section) |
| 5078 | { |
| 5079 | /* Translate the relocation's destination. */ |
| 5080 | bfd_vma new_offset; |
| 5081 | bfd_vma new_end_offset; |
| 5082 | bfd_byte *size_p; |
| 5083 | long old_size, new_size; |
| 5084 | |
| 5085 | new_offset = |
| 5086 | offset_with_removed_literals (&target_relax_info->removed_list, |
| 5087 | r_rel.target_offset); |
| 5088 | |
| 5089 | /* Assert that we are not out of bounds. */ |
| 5090 | size_p = &contents[irel->r_offset + 4]; |
| 5091 | old_size = bfd_get_32 (abfd, &contents[irel->r_offset + 4]); |
| 5092 | |
| 5093 | new_end_offset = |
| 5094 | offset_with_removed_literals (&target_relax_info->removed_list, |
| 5095 | r_rel.target_offset + old_size); |
| 5096 | |
| 5097 | new_size = new_end_offset - new_offset; |
| 5098 | if (new_size != old_size) |
| 5099 | { |
| 5100 | bfd_put_32 (abfd, new_size, size_p); |
| 5101 | pin_contents (sec, contents); |
| 5102 | } |
| 5103 | |
| 5104 | if (new_offset != r_rel.target_offset) |
| 5105 | { |
| 5106 | bfd_vma diff = new_offset - r_rel.target_offset; |
| 5107 | irel->r_addend += diff; |
| 5108 | pin_internal_relocs (sec, internal_relocs); |
| 5109 | } |
| 5110 | } |
| 5111 | } |
| 5112 | } |
| 5113 | |
| 5114 | /* Combine adjacent property table entries. This is also done in |
| 5115 | finish_dynamic_sections() but at that point it's too late to |
| 5116 | reclaim the space in the output section, so we do this twice. */ |
| 5117 | |
| 5118 | if (internal_relocs) |
| 5119 | { |
| 5120 | Elf_Internal_Rela *last_irel = NULL; |
| 5121 | int removed_bytes = 0; |
| 5122 | bfd_vma offset, last_irel_offset; |
| 5123 | bfd_vma section_size; |
| 5124 | |
| 5125 | /* Walk over memory and irels at the same time. |
| 5126 | This REQUIRES that the internal_relocs be sorted by offset. */ |
| 5127 | qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela), |
| 5128 | internal_reloc_compare); |
| 5129 | nexti = 0; /* Index into internal_relocs. */ |
| 5130 | |
| 5131 | pin_internal_relocs (sec, internal_relocs); |
| 5132 | pin_contents (sec, contents); |
| 5133 | |
| 5134 | last_irel_offset = (bfd_vma) -1; |
| 5135 | section_size = (sec->_cooked_size ? sec->_cooked_size : sec->_raw_size); |
| 5136 | BFD_ASSERT (section_size % 8 == 0); |
| 5137 | |
| 5138 | for (offset = 0; offset < section_size; offset += 8) |
| 5139 | { |
| 5140 | Elf_Internal_Rela *irel, *next_irel; |
| 5141 | bfd_vma bytes_to_remove, size, actual_offset; |
| 5142 | bfd_boolean remove_this_irel; |
| 5143 | |
| 5144 | irel = NULL; |
| 5145 | next_irel = NULL; |
| 5146 | |
| 5147 | /* Find the next two relocations (if there are that many left), |
| 5148 | skipping over any R_XTENSA_NONE relocs. On entry, "nexti" is |
| 5149 | the starting reloc index. After these two loops, "i" |
| 5150 | is the index of the first non-NONE reloc past that starting |
| 5151 | index, and "nexti" is the index for the next non-NONE reloc |
| 5152 | after "i". */ |
| 5153 | |
| 5154 | for (i = nexti; i < sec->reloc_count; i++) |
| 5155 | { |
| 5156 | if (ELF32_R_TYPE (internal_relocs[i].r_info) != R_XTENSA_NONE) |
| 5157 | { |
| 5158 | irel = &internal_relocs[i]; |
| 5159 | break; |
| 5160 | } |
| 5161 | internal_relocs[i].r_offset -= removed_bytes; |
| 5162 | } |
| 5163 | |
| 5164 | for (nexti = i + 1; nexti < sec->reloc_count; nexti++) |
| 5165 | { |
| 5166 | if (ELF32_R_TYPE (internal_relocs[nexti].r_info) |
| 5167 | != R_XTENSA_NONE) |
| 5168 | { |
| 5169 | next_irel = &internal_relocs[nexti]; |
| 5170 | break; |
| 5171 | } |
| 5172 | internal_relocs[nexti].r_offset -= removed_bytes; |
| 5173 | } |
| 5174 | |
| 5175 | remove_this_irel = FALSE; |
| 5176 | bytes_to_remove = 0; |
| 5177 | actual_offset = offset - removed_bytes; |
| 5178 | size = bfd_get_32 (abfd, &contents[actual_offset + 4]); |
| 5179 | |
| 5180 | /* Check that the irels are sorted by offset, |
| 5181 | with only one per address. */ |
| 5182 | BFD_ASSERT (!irel || (int) irel->r_offset > (int) last_irel_offset); |
| 5183 | BFD_ASSERT (!next_irel || next_irel->r_offset > irel->r_offset); |
| 5184 | |
| 5185 | /* Make sure there isn't a reloc on the size field. */ |
| 5186 | if (irel && irel->r_offset == offset + 4) |
| 5187 | { |
| 5188 | irel->r_offset -= removed_bytes; |
| 5189 | last_irel_offset = irel->r_offset; |
| 5190 | } |
| 5191 | else if (next_irel && next_irel->r_offset == offset + 4) |
| 5192 | { |
| 5193 | nexti += 1; |
| 5194 | irel->r_offset -= removed_bytes; |
| 5195 | next_irel->r_offset -= removed_bytes; |
| 5196 | last_irel_offset = next_irel->r_offset; |
| 5197 | } |
| 5198 | else if (size == 0) |
| 5199 | { |
| 5200 | /* Always remove entries with zero size. */ |
| 5201 | bytes_to_remove = 8; |
| 5202 | if (irel && irel->r_offset == offset) |
| 5203 | { |
| 5204 | remove_this_irel = TRUE; |
| 5205 | |
| 5206 | irel->r_offset -= removed_bytes; |
| 5207 | last_irel_offset = irel->r_offset; |
| 5208 | } |
| 5209 | } |
| 5210 | else if (irel && irel->r_offset == offset) |
| 5211 | { |
| 5212 | if (ELF32_R_TYPE (irel->r_info) == R_XTENSA_32) |
| 5213 | { |
| 5214 | if (last_irel) |
| 5215 | { |
| 5216 | bfd_vma old_size = |
| 5217 | bfd_get_32 (abfd, &contents[last_irel->r_offset + 4]); |
| 5218 | bfd_vma old_address = |
| 5219 | (last_irel->r_addend |
| 5220 | + bfd_get_32 (abfd, &contents[last_irel->r_offset])); |
| 5221 | bfd_vma new_address = |
| 5222 | (irel->r_addend |
| 5223 | + bfd_get_32 (abfd, &contents[actual_offset])); |
| 5224 | |
| 5225 | if ((ELF32_R_SYM (irel->r_info) == |
| 5226 | ELF32_R_SYM (last_irel->r_info)) |
| 5227 | && (old_address + old_size == new_address)) |
| 5228 | { |
| 5229 | /* fix the old size */ |
| 5230 | bfd_put_32 (abfd, old_size + size, |
| 5231 | &contents[last_irel->r_offset + 4]); |
| 5232 | bytes_to_remove = 8; |
| 5233 | remove_this_irel = TRUE; |
| 5234 | } |
| 5235 | else |
| 5236 | last_irel = irel; |
| 5237 | } |
| 5238 | else |
| 5239 | last_irel = irel; |
| 5240 | } |
| 5241 | |
| 5242 | irel->r_offset -= removed_bytes; |
| 5243 | last_irel_offset = irel->r_offset; |
| 5244 | } |
| 5245 | |
| 5246 | if (remove_this_irel) |
| 5247 | { |
| 5248 | irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); |
| 5249 | irel->r_offset -= bytes_to_remove; |
| 5250 | } |
| 5251 | |
| 5252 | if (bytes_to_remove != 0) |
| 5253 | { |
| 5254 | removed_bytes += bytes_to_remove; |
| 5255 | if (offset + 8 < section_size) |
| 5256 | memmove (&contents[actual_offset], |
| 5257 | &contents[actual_offset+8], |
| 5258 | section_size - offset - 8); |
| 5259 | } |
| 5260 | } |
| 5261 | |
| 5262 | if (removed_bytes) |
| 5263 | { |
| 5264 | /* Clear the removed bytes. */ |
| 5265 | memset (&contents[section_size - removed_bytes], 0, removed_bytes); |
| 5266 | |
| 5267 | sec->_cooked_size = section_size - removed_bytes; |
| 5268 | /* Also shrink _raw_size. (The code in relocate_section that |
| 5269 | checks that relocations are within the section must use |
| 5270 | _raw_size because of the way the stabs sections are |
| 5271 | relaxed; shrinking _raw_size means that these checks will |
| 5272 | not be unnecessarily lax.) */ |
| 5273 | sec->_raw_size = sec->_cooked_size; |
| 5274 | |
| 5275 | if (xtensa_is_littable_section (sec)) |
| 5276 | { |
| 5277 | bfd *dynobj = elf_hash_table (link_info)->dynobj; |
| 5278 | if (dynobj) |
| 5279 | { |
| 5280 | asection *sgotloc = |
| 5281 | bfd_get_section_by_name (dynobj, ".got.loc"); |
| 5282 | if (sgotloc) |
| 5283 | { |
| 5284 | bfd_size_type sgotloc_size = |
| 5285 | (sgotloc->_cooked_size ? sgotloc->_cooked_size |
| 5286 | : sgotloc->_raw_size); |
| 5287 | sgotloc->_cooked_size = sgotloc_size - removed_bytes; |
| 5288 | sgotloc->_raw_size = sgotloc_size - removed_bytes; |
| 5289 | } |
| 5290 | } |
| 5291 | } |
| 5292 | } |
| 5293 | } |
| 5294 | |
| 5295 | error_return: |
| 5296 | release_internal_relocs (sec, internal_relocs); |
| 5297 | release_contents (sec, contents); |
| 5298 | return ok; |
| 5299 | } |
| 5300 | |
| 5301 | \f |
| 5302 | /* Third relaxation pass. */ |
| 5303 | |
| 5304 | /* Change symbol values to account for removed literals. */ |
| 5305 | |
| 5306 | bfd_boolean |
| 5307 | relax_section_symbols (abfd, sec) |
| 5308 | bfd *abfd; |
| 5309 | asection *sec; |
| 5310 | { |
| 5311 | xtensa_relax_info *relax_info; |
| 5312 | unsigned int sec_shndx; |
| 5313 | Elf_Internal_Shdr *symtab_hdr; |
| 5314 | Elf_Internal_Sym *isymbuf; |
| 5315 | unsigned i, num_syms, num_locals; |
| 5316 | |
| 5317 | relax_info = get_xtensa_relax_info (sec); |
| 5318 | BFD_ASSERT (relax_info); |
| 5319 | |
| 5320 | if (!relax_info->is_relaxable_literal_section) |
| 5321 | return TRUE; |
| 5322 | |
| 5323 | sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| 5324 | |
| 5325 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 5326 | isymbuf = retrieve_local_syms (abfd); |
| 5327 | |
| 5328 | num_syms = symtab_hdr->sh_size / sizeof (Elf32_External_Sym); |
| 5329 | num_locals = symtab_hdr->sh_info; |
| 5330 | |
| 5331 | /* Adjust the local symbols defined in this section. */ |
| 5332 | for (i = 0; i < num_locals; i++) |
| 5333 | { |
| 5334 | Elf_Internal_Sym *isym = &isymbuf[i]; |
| 5335 | |
| 5336 | if (isym->st_shndx == sec_shndx) |
| 5337 | { |
| 5338 | bfd_vma new_address = offset_with_removed_literals |
| 5339 | (&relax_info->removed_list, isym->st_value); |
| 5340 | if (new_address != isym->st_value) |
| 5341 | isym->st_value = new_address; |
| 5342 | } |
| 5343 | } |
| 5344 | |
| 5345 | /* Now adjust the global symbols defined in this section. */ |
| 5346 | for (i = 0; i < (num_syms - num_locals); i++) |
| 5347 | { |
| 5348 | struct elf_link_hash_entry *sym_hash; |
| 5349 | |
| 5350 | sym_hash = elf_sym_hashes (abfd)[i]; |
| 5351 | |
| 5352 | if (sym_hash->root.type == bfd_link_hash_warning) |
| 5353 | sym_hash = (struct elf_link_hash_entry *) sym_hash->root.u.i.link; |
| 5354 | |
| 5355 | if ((sym_hash->root.type == bfd_link_hash_defined |
| 5356 | || sym_hash->root.type == bfd_link_hash_defweak) |
| 5357 | && sym_hash->root.u.def.section == sec) |
| 5358 | { |
| 5359 | bfd_vma new_address = offset_with_removed_literals |
| 5360 | (&relax_info->removed_list, sym_hash->root.u.def.value); |
| 5361 | if (new_address != sym_hash->root.u.def.value) |
| 5362 | sym_hash->root.u.def.value = new_address; |
| 5363 | } |
| 5364 | } |
| 5365 | |
| 5366 | return TRUE; |
| 5367 | } |
| 5368 | |
| 5369 | \f |
| 5370 | /* "Fix" handling functions, called while performing relocations. */ |
| 5371 | |
| 5372 | static void |
| 5373 | do_fix_for_relocatable_link (rel, input_bfd, input_section) |
| 5374 | Elf_Internal_Rela *rel; |
| 5375 | bfd *input_bfd; |
| 5376 | asection *input_section; |
| 5377 | { |
| 5378 | r_reloc r_rel; |
| 5379 | asection *sec, *old_sec; |
| 5380 | bfd_vma old_offset; |
| 5381 | int r_type = ELF32_R_TYPE (rel->r_info); |
| 5382 | reloc_bfd_fix *fix_list; |
| 5383 | reloc_bfd_fix *fix; |
| 5384 | |
| 5385 | if (r_type == R_XTENSA_NONE) |
| 5386 | return; |
| 5387 | |
| 5388 | fix_list = (get_xtensa_relax_info (input_section))->fix_list; |
| 5389 | if (fix_list == NULL) |
| 5390 | return; |
| 5391 | |
| 5392 | fix = get_bfd_fix (fix_list, input_section, rel->r_offset, r_type); |
| 5393 | if (fix == NULL) |
| 5394 | return; |
| 5395 | |
| 5396 | r_reloc_init (&r_rel, input_bfd, rel); |
| 5397 | old_sec = r_reloc_get_section (&r_rel); |
| 5398 | old_offset = r_reloc_get_target_offset (&r_rel); |
| 5399 | |
| 5400 | if (old_sec == NULL || !r_reloc_is_defined (&r_rel)) |
| 5401 | { |
| 5402 | BFD_ASSERT (r_type == R_XTENSA_ASM_EXPAND); |
| 5403 | /* Leave it be. Resolution will happen in a later stage. */ |
| 5404 | } |
| 5405 | else |
| 5406 | { |
| 5407 | sec = fix->target_sec; |
| 5408 | rel->r_addend += ((sec->output_offset + fix->target_offset) |
| 5409 | - (old_sec->output_offset + old_offset)); |
| 5410 | } |
| 5411 | } |
| 5412 | |
| 5413 | |
| 5414 | static void |
| 5415 | do_fix_for_final_link (rel, input_section, relocationp) |
| 5416 | Elf_Internal_Rela *rel; |
| 5417 | asection *input_section; |
| 5418 | bfd_vma *relocationp; |
| 5419 | { |
| 5420 | asection *sec; |
| 5421 | int r_type = ELF32_R_TYPE (rel->r_info); |
| 5422 | reloc_bfd_fix *fix_list; |
| 5423 | reloc_bfd_fix *fix; |
| 5424 | |
| 5425 | if (r_type == R_XTENSA_NONE) |
| 5426 | return; |
| 5427 | |
| 5428 | fix_list = (get_xtensa_relax_info (input_section))->fix_list; |
| 5429 | if (fix_list == NULL) |
| 5430 | return; |
| 5431 | |
| 5432 | fix = get_bfd_fix (fix_list, input_section, rel->r_offset, r_type); |
| 5433 | if (fix == NULL) |
| 5434 | return; |
| 5435 | |
| 5436 | sec = fix->target_sec; |
| 5437 | *relocationp = (sec->output_section->vma |
| 5438 | + sec->output_offset |
| 5439 | + fix->target_offset - rel->r_addend); |
| 5440 | } |
| 5441 | |
| 5442 | \f |
| 5443 | /* Miscellaneous utility functions.... */ |
| 5444 | |
| 5445 | static asection * |
| 5446 | elf_xtensa_get_plt_section (dynobj, chunk) |
| 5447 | bfd *dynobj; |
| 5448 | int chunk; |
| 5449 | { |
| 5450 | char plt_name[10]; |
| 5451 | |
| 5452 | if (chunk == 0) |
| 5453 | return bfd_get_section_by_name (dynobj, ".plt"); |
| 5454 | |
| 5455 | sprintf (plt_name, ".plt.%u", chunk); |
| 5456 | return bfd_get_section_by_name (dynobj, plt_name); |
| 5457 | } |
| 5458 | |
| 5459 | |
| 5460 | static asection * |
| 5461 | elf_xtensa_get_gotplt_section (dynobj, chunk) |
| 5462 | bfd *dynobj; |
| 5463 | int chunk; |
| 5464 | { |
| 5465 | char got_name[14]; |
| 5466 | |
| 5467 | if (chunk == 0) |
| 5468 | return bfd_get_section_by_name (dynobj, ".got.plt"); |
| 5469 | |
| 5470 | sprintf (got_name, ".got.plt.%u", chunk); |
| 5471 | return bfd_get_section_by_name (dynobj, got_name); |
| 5472 | } |
| 5473 | |
| 5474 | |
| 5475 | /* Get the input section for a given symbol index. |
| 5476 | If the symbol is: |
| 5477 | . a section symbol, return the section; |
| 5478 | . a common symbol, return the common section; |
| 5479 | . an undefined symbol, return the undefined section; |
| 5480 | . an indirect symbol, follow the links; |
| 5481 | . an absolute value, return the absolute section. */ |
| 5482 | |
| 5483 | static asection * |
| 5484 | get_elf_r_symndx_section (abfd, r_symndx) |
| 5485 | bfd *abfd; |
| 5486 | unsigned long r_symndx; |
| 5487 | { |
| 5488 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 5489 | asection *target_sec = NULL; |
| 5490 | if (r_symndx < symtab_hdr->sh_info) |
| 5491 | { |
| 5492 | Elf_Internal_Sym *isymbuf; |
| 5493 | unsigned int section_index; |
| 5494 | |
| 5495 | isymbuf = retrieve_local_syms (abfd); |
| 5496 | section_index = isymbuf[r_symndx].st_shndx; |
| 5497 | |
| 5498 | if (section_index == SHN_UNDEF) |
| 5499 | target_sec = bfd_und_section_ptr; |
| 5500 | else if (section_index > 0 && section_index < SHN_LORESERVE) |
| 5501 | target_sec = bfd_section_from_elf_index (abfd, section_index); |
| 5502 | else if (section_index == SHN_ABS) |
| 5503 | target_sec = bfd_abs_section_ptr; |
| 5504 | else if (section_index == SHN_COMMON) |
| 5505 | target_sec = bfd_com_section_ptr; |
| 5506 | else |
| 5507 | /* Who knows? */ |
| 5508 | target_sec = NULL; |
| 5509 | } |
| 5510 | else |
| 5511 | { |
| 5512 | unsigned long indx = r_symndx - symtab_hdr->sh_info; |
| 5513 | struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx]; |
| 5514 | |
| 5515 | while (h->root.type == bfd_link_hash_indirect |
| 5516 | || h->root.type == bfd_link_hash_warning) |
| 5517 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 5518 | |
| 5519 | switch (h->root.type) |
| 5520 | { |
| 5521 | case bfd_link_hash_defined: |
| 5522 | case bfd_link_hash_defweak: |
| 5523 | target_sec = h->root.u.def.section; |
| 5524 | break; |
| 5525 | case bfd_link_hash_common: |
| 5526 | target_sec = bfd_com_section_ptr; |
| 5527 | break; |
| 5528 | case bfd_link_hash_undefined: |
| 5529 | case bfd_link_hash_undefweak: |
| 5530 | target_sec = bfd_und_section_ptr; |
| 5531 | break; |
| 5532 | default: /* New indirect warning. */ |
| 5533 | target_sec = bfd_und_section_ptr; |
| 5534 | break; |
| 5535 | } |
| 5536 | } |
| 5537 | return target_sec; |
| 5538 | } |
| 5539 | |
| 5540 | |
| 5541 | static struct elf_link_hash_entry * |
| 5542 | get_elf_r_symndx_hash_entry (abfd, r_symndx) |
| 5543 | bfd *abfd; |
| 5544 | unsigned long r_symndx; |
| 5545 | { |
| 5546 | unsigned long indx; |
| 5547 | struct elf_link_hash_entry *h; |
| 5548 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 5549 | |
| 5550 | if (r_symndx < symtab_hdr->sh_info) |
| 5551 | return NULL; |
| 5552 | |
| 5553 | indx = r_symndx - symtab_hdr->sh_info; |
| 5554 | h = elf_sym_hashes (abfd)[indx]; |
| 5555 | while (h->root.type == bfd_link_hash_indirect |
| 5556 | || h->root.type == bfd_link_hash_warning) |
| 5557 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 5558 | return h; |
| 5559 | } |
| 5560 | |
| 5561 | |
| 5562 | /* Get the section-relative offset for a symbol number. */ |
| 5563 | |
| 5564 | static bfd_vma |
| 5565 | get_elf_r_symndx_offset (abfd, r_symndx) |
| 5566 | bfd *abfd; |
| 5567 | unsigned long r_symndx; |
| 5568 | { |
| 5569 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 5570 | bfd_vma offset = 0; |
| 5571 | |
| 5572 | if (r_symndx < symtab_hdr->sh_info) |
| 5573 | { |
| 5574 | Elf_Internal_Sym *isymbuf; |
| 5575 | isymbuf = retrieve_local_syms (abfd); |
| 5576 | offset = isymbuf[r_symndx].st_value; |
| 5577 | } |
| 5578 | else |
| 5579 | { |
| 5580 | unsigned long indx = r_symndx - symtab_hdr->sh_info; |
| 5581 | struct elf_link_hash_entry *h = |
| 5582 | elf_sym_hashes (abfd)[indx]; |
| 5583 | |
| 5584 | while (h->root.type == bfd_link_hash_indirect |
| 5585 | || h->root.type == bfd_link_hash_warning) |
| 5586 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 5587 | if (h->root.type == bfd_link_hash_defined |
| 5588 | || h->root.type == bfd_link_hash_defweak) |
| 5589 | offset = h->root.u.def.value; |
| 5590 | } |
| 5591 | return offset; |
| 5592 | } |
| 5593 | |
| 5594 | |
| 5595 | static bfd_boolean |
| 5596 | pcrel_reloc_fits (opnd, self_address, dest_address) |
| 5597 | xtensa_operand opnd; |
| 5598 | bfd_vma self_address; |
| 5599 | bfd_vma dest_address; |
| 5600 | { |
| 5601 | uint32 new_address = |
| 5602 | xtensa_operand_do_reloc (opnd, dest_address, self_address); |
| 5603 | return (xtensa_operand_encode (opnd, &new_address) |
| 5604 | == xtensa_encode_result_ok); |
| 5605 | } |
| 5606 | |
| 5607 | |
| 5608 | static bfd_boolean |
| 5609 | xtensa_is_property_section (sec) |
| 5610 | asection *sec; |
| 5611 | { |
| 5612 | static int linkonce_len = sizeof (".gnu.linkonce.") - 1; |
| 5613 | |
| 5614 | if (strncmp (".xt.insn", sec->name, 8) == 0 |
| 5615 | || strncmp (".xt.lit", sec->name, 7) == 0) |
| 5616 | return TRUE; |
| 5617 | |
| 5618 | if (strncmp (".gnu.linkonce.", sec->name, linkonce_len) == 0) |
| 5619 | { |
| 5620 | if (strncmp ("x.", sec->name + linkonce_len, 2) == 0 |
| 5621 | || strncmp ("p.", sec->name + linkonce_len, 2) == 0) |
| 5622 | return TRUE; |
| 5623 | if (strstr (sec->name + linkonce_len, ".xt.insn") != NULL |
| 5624 | || strstr (sec->name + linkonce_len, ".xt.lit") != NULL) |
| 5625 | return TRUE; |
| 5626 | } |
| 5627 | return FALSE; |
| 5628 | } |
| 5629 | |
| 5630 | |
| 5631 | static bfd_boolean |
| 5632 | xtensa_is_littable_section (sec) |
| 5633 | asection *sec; |
| 5634 | { |
| 5635 | static int linkonce_len = sizeof (".gnu.linkonce.") - 1; |
| 5636 | |
| 5637 | if (strncmp (".xt.lit", sec->name, 7) == 0) |
| 5638 | return TRUE; |
| 5639 | |
| 5640 | if (strncmp (".gnu.linkonce.", sec->name, linkonce_len) == 0) |
| 5641 | { |
| 5642 | if (strncmp ("p.", sec->name + linkonce_len, 2) == 0) |
| 5643 | return TRUE; |
| 5644 | if (strstr (sec->name + linkonce_len, ".xt.lit") != NULL) |
| 5645 | return TRUE; |
| 5646 | } |
| 5647 | return FALSE; |
| 5648 | } |
| 5649 | |
| 5650 | |
| 5651 | static bfd_boolean |
| 5652 | is_literal_section (sec) |
| 5653 | asection *sec; |
| 5654 | { |
| 5655 | /* FIXME: the current definition of this leaves a lot to be desired.... */ |
| 5656 | if (sec == NULL || sec->name == NULL) |
| 5657 | return FALSE; |
| 5658 | return (strstr (sec->name, "literal") != NULL); |
| 5659 | } |
| 5660 | |
| 5661 | |
| 5662 | static int |
| 5663 | internal_reloc_compare (ap, bp) |
| 5664 | const PTR ap; |
| 5665 | const PTR bp; |
| 5666 | { |
| 5667 | const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap; |
| 5668 | const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp; |
| 5669 | |
| 5670 | return (a->r_offset - b->r_offset); |
| 5671 | } |
| 5672 | |
| 5673 | |
| 5674 | static bfd_boolean |
| 5675 | get_is_linkonce_section (abfd, sec) |
| 5676 | bfd *abfd ATTRIBUTE_UNUSED; |
| 5677 | asection *sec; |
| 5678 | { |
| 5679 | flagword flags, link_once_flags; |
| 5680 | bfd_boolean is_linkonce = FALSE;; |
| 5681 | |
| 5682 | flags = bfd_get_section_flags (abfd, sec); |
| 5683 | link_once_flags = (flags & SEC_LINK_ONCE); |
| 5684 | if (link_once_flags != 0) |
| 5685 | is_linkonce = TRUE; |
| 5686 | |
| 5687 | /* In order for this to be useful to the assembler |
| 5688 | before the linkonce flag is set we need to |
| 5689 | check for the GNU extension name. */ |
| 5690 | if (!is_linkonce && |
| 5691 | strncmp (sec->name, ".gnu.linkonce", sizeof ".gnu.linkonce" - 1) == 0) |
| 5692 | is_linkonce = TRUE; |
| 5693 | |
| 5694 | return is_linkonce; |
| 5695 | } |
| 5696 | |
| 5697 | |
| 5698 | char * |
| 5699 | xtensa_get_property_section_name (abfd, sec, base_name) |
| 5700 | bfd *abfd; |
| 5701 | asection *sec; |
| 5702 | const char * base_name; |
| 5703 | { |
| 5704 | char *table_sec_name = NULL; |
| 5705 | bfd_boolean is_linkonce; |
| 5706 | |
| 5707 | is_linkonce = get_is_linkonce_section (abfd, sec); |
| 5708 | |
| 5709 | if (!is_linkonce) |
| 5710 | { |
| 5711 | table_sec_name = strdup (base_name); |
| 5712 | } |
| 5713 | else |
| 5714 | { |
| 5715 | static size_t prefix_len = sizeof (".gnu.linkonce.t.") - 1; |
| 5716 | size_t len = strlen (sec->name) + 1; |
| 5717 | char repl_char = '\0'; |
| 5718 | const char *segname = sec->name; |
| 5719 | |
| 5720 | if (strncmp (segname, ".gnu.linkonce.t.", prefix_len) == 0) |
| 5721 | { |
| 5722 | if (strcmp (base_name, ".xt.insn") == 0) |
| 5723 | repl_char = 'x'; |
| 5724 | else if (strcmp (base_name, ".xt.lit") == 0) |
| 5725 | repl_char = 'p'; |
| 5726 | } |
| 5727 | |
| 5728 | if (repl_char != '\0') |
| 5729 | { |
| 5730 | char *name = (char *) bfd_malloc (len); |
| 5731 | memcpy (name, sec->name, len); |
| 5732 | name[prefix_len - 2] = repl_char; |
| 5733 | table_sec_name = name; |
| 5734 | } |
| 5735 | else |
| 5736 | { |
| 5737 | size_t base_len = strlen (base_name) + 1; |
| 5738 | char *name = (char *) bfd_malloc (len + base_len); |
| 5739 | memcpy (name, sec->name, len - 1); |
| 5740 | memcpy (name + len - 1, base_name, base_len); |
| 5741 | table_sec_name = name; |
| 5742 | } |
| 5743 | } |
| 5744 | |
| 5745 | return table_sec_name; |
| 5746 | } |
| 5747 | |
| 5748 | \f |
| 5749 | /* Other functions called directly by the linker. */ |
| 5750 | |
| 5751 | bfd_boolean |
| 5752 | xtensa_callback_required_dependence (abfd, sec, link_info, callback, closure) |
| 5753 | bfd *abfd; |
| 5754 | asection *sec; |
| 5755 | struct bfd_link_info *link_info; |
| 5756 | deps_callback_t callback; |
| 5757 | PTR closure; |
| 5758 | { |
| 5759 | Elf_Internal_Rela *internal_relocs; |
| 5760 | bfd_byte *contents; |
| 5761 | unsigned i; |
| 5762 | bfd_boolean ok = TRUE; |
| 5763 | |
| 5764 | /* ".plt*" sections have no explicit relocations but they contain L32R |
| 5765 | instructions that reference the corresponding ".got.plt*" sections. */ |
| 5766 | if ((sec->flags & SEC_LINKER_CREATED) != 0 |
| 5767 | && strncmp (sec->name, ".plt", 4) == 0) |
| 5768 | { |
| 5769 | asection *sgotplt; |
| 5770 | |
| 5771 | /* Find the corresponding ".got.plt*" section. */ |
| 5772 | if (sec->name[4] == '\0') |
| 5773 | sgotplt = bfd_get_section_by_name (sec->owner, ".got.plt"); |
| 5774 | else |
| 5775 | { |
| 5776 | char got_name[14]; |
| 5777 | int chunk = 0; |
| 5778 | |
| 5779 | BFD_ASSERT (sec->name[4] == '.'); |
| 5780 | chunk = strtol (&sec->name[5], NULL, 10); |
| 5781 | |
| 5782 | sprintf (got_name, ".got.plt.%u", chunk); |
| 5783 | sgotplt = bfd_get_section_by_name (sec->owner, got_name); |
| 5784 | } |
| 5785 | BFD_ASSERT (sgotplt); |
| 5786 | |
| 5787 | /* Assume worst-case offsets: L32R at the very end of the ".plt" |
| 5788 | section referencing a literal at the very beginning of |
| 5789 | ".got.plt". This is very close to the real dependence, anyway. */ |
| 5790 | (*callback) (sec, sec->_raw_size, sgotplt, 0, closure); |
| 5791 | } |
| 5792 | |
| 5793 | internal_relocs = retrieve_internal_relocs (abfd, sec, |
| 5794 | link_info->keep_memory); |
| 5795 | if (internal_relocs == NULL |
| 5796 | || sec->reloc_count == 0) |
| 5797 | return ok; |
| 5798 | |
| 5799 | /* Cache the contents for the duration of this scan. */ |
| 5800 | contents = retrieve_contents (abfd, sec, link_info->keep_memory); |
| 5801 | if (contents == NULL && sec->_raw_size != 0) |
| 5802 | { |
| 5803 | ok = FALSE; |
| 5804 | goto error_return; |
| 5805 | } |
| 5806 | |
| 5807 | if (xtensa_default_isa == NULL) |
| 5808 | xtensa_isa_init (); |
| 5809 | |
| 5810 | for (i = 0; i < sec->reloc_count; i++) |
| 5811 | { |
| 5812 | Elf_Internal_Rela *irel = &internal_relocs[i]; |
| 5813 | if (is_l32r_relocation (sec, contents, irel)) |
| 5814 | { |
| 5815 | r_reloc l32r_rel; |
| 5816 | asection *target_sec; |
| 5817 | bfd_vma target_offset; |
| 5818 | |
| 5819 | r_reloc_init (&l32r_rel, abfd, irel); |
| 5820 | target_sec = NULL; |
| 5821 | target_offset = 0; |
| 5822 | /* L32Rs must be local to the input file. */ |
| 5823 | if (r_reloc_is_defined (&l32r_rel)) |
| 5824 | { |
| 5825 | target_sec = r_reloc_get_section (&l32r_rel); |
| 5826 | target_offset = r_reloc_get_target_offset (&l32r_rel); |
| 5827 | } |
| 5828 | (*callback) (sec, irel->r_offset, target_sec, target_offset, |
| 5829 | closure); |
| 5830 | } |
| 5831 | } |
| 5832 | |
| 5833 | error_return: |
| 5834 | release_internal_relocs (sec, internal_relocs); |
| 5835 | release_contents (sec, contents); |
| 5836 | return ok; |
| 5837 | } |
| 5838 | |
| 5839 | /* The default literal sections should always be marked as "code" (i.e., |
| 5840 | SHF_EXECINSTR). This is particularly important for the Linux kernel |
| 5841 | module loader so that the literals are not placed after the text. */ |
| 5842 | static struct bfd_elf_special_section const elf_xtensa_special_sections[]= |
| 5843 | { |
| 5844 | { ".literal", 0, NULL, 0, |
| 5845 | SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR }, |
| 5846 | { ".init.literal", 0, NULL, 0, |
| 5847 | SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR }, |
| 5848 | { ".fini.literal", 0, NULL, 0, |
| 5849 | SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR }, |
| 5850 | { NULL, 0, NULL, 0, |
| 5851 | 0, 0 } |
| 5852 | }; |
| 5853 | |
| 5854 | \f |
| 5855 | #ifndef ELF_ARCH |
| 5856 | #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec |
| 5857 | #define TARGET_LITTLE_NAME "elf32-xtensa-le" |
| 5858 | #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec |
| 5859 | #define TARGET_BIG_NAME "elf32-xtensa-be" |
| 5860 | #define ELF_ARCH bfd_arch_xtensa |
| 5861 | |
| 5862 | /* The new EM_XTENSA value will be recognized beginning in the Xtensa T1040 |
| 5863 | release. However, we still have to generate files with the EM_XTENSA_OLD |
| 5864 | value so that pre-T1040 tools can read the files. As soon as we stop |
| 5865 | caring about pre-T1040 tools, the following two values should be |
| 5866 | swapped. At the same time, any other code that uses EM_XTENSA_OLD |
| 5867 | (e.g., prep_headers() in elf.c) should be changed to use EM_XTENSA. */ |
| 5868 | #define ELF_MACHINE_CODE EM_XTENSA_OLD |
| 5869 | #define ELF_MACHINE_ALT1 EM_XTENSA |
| 5870 | |
| 5871 | #if XCHAL_HAVE_MMU |
| 5872 | #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE) |
| 5873 | #else /* !XCHAL_HAVE_MMU */ |
| 5874 | #define ELF_MAXPAGESIZE 1 |
| 5875 | #endif /* !XCHAL_HAVE_MMU */ |
| 5876 | #endif /* ELF_ARCH */ |
| 5877 | |
| 5878 | #define elf_backend_can_gc_sections 1 |
| 5879 | #define elf_backend_can_refcount 1 |
| 5880 | #define elf_backend_plt_readonly 1 |
| 5881 | #define elf_backend_got_header_size 4 |
| 5882 | #define elf_backend_want_dynbss 0 |
| 5883 | #define elf_backend_want_got_plt 1 |
| 5884 | |
| 5885 | #define elf_info_to_howto elf_xtensa_info_to_howto_rela |
| 5886 | |
| 5887 | #define bfd_elf32_bfd_final_link bfd_elf32_bfd_final_link |
| 5888 | #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data |
| 5889 | #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook |
| 5890 | #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data |
| 5891 | #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section |
| 5892 | #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup |
| 5893 | #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags |
| 5894 | |
| 5895 | #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol |
| 5896 | #define elf_backend_check_relocs elf_xtensa_check_relocs |
| 5897 | #define elf_backend_copy_indirect_symbol elf_xtensa_copy_indirect_symbol |
| 5898 | #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections |
| 5899 | #define elf_backend_discard_info elf_xtensa_discard_info |
| 5900 | #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs |
| 5901 | #define elf_backend_final_write_processing elf_xtensa_final_write_processing |
| 5902 | #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections |
| 5903 | #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol |
| 5904 | #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook |
| 5905 | #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook |
| 5906 | #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus |
| 5907 | #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo |
| 5908 | #define elf_backend_hide_symbol elf_xtensa_hide_symbol |
| 5909 | #define elf_backend_modify_segment_map elf_xtensa_modify_segment_map |
| 5910 | #define elf_backend_object_p elf_xtensa_object_p |
| 5911 | #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class |
| 5912 | #define elf_backend_relocate_section elf_xtensa_relocate_section |
| 5913 | #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections |
| 5914 | #define elf_backend_special_sections elf_xtensa_special_sections |
| 5915 | |
| 5916 | #include "elf32-target.h" |