1 /* BFD back-end for HP PA-RISC ELF files. 2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, 2001 3 Free Software Foundation, Inc. 4 5 Original code by 6 Center for Software Science 7 Department of Computer Science 8 University of Utah 9 Largely rewritten by Alan Modra <alan@linuxcare.com.au> 10 11 This file is part of BFD, the Binary File Descriptor library. 12 13 This program is free software; you can redistribute it and/or modify 14 it under the terms of the GNU General Public License as published by 15 the Free Software Foundation; either version 2 of the License, or 16 (at your option) any later version. 17 18 This program is distributed in the hope that it will be useful, 19 but WITHOUT ANY WARRANTY; without even the implied warranty of 20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 GNU General Public License for more details. 22 23 You should have received a copy of the GNU General Public License 24 along with this program; if not, write to the Free Software 25 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 26 27 #include "bfd.h" 28 #include "sysdep.h" 29 #include "libbfd.h" 30 #include "elf-bfd.h" 31 #include "elf/hppa.h" 32 #include "libhppa.h" 33 #include "elf32-hppa.h" 34 #define ARCH_SIZE 32 35 #include "elf-hppa.h" 36 #include "elf32-hppa.h" 37 38 /* In order to gain some understanding of code in this file without 39 knowing all the intricate details of the linker, note the 40 following: 41 42 Functions named elf32_hppa_* are called by external routines, other 43 functions are only called locally. elf32_hppa_* functions appear 44 in this file more or less in the order in which they are called 45 from external routines. eg. elf32_hppa_check_relocs is called 46 early in the link process, elf32_hppa_finish_dynamic_sections is 47 one of the last functions. */ 48 49 /* We use two hash tables to hold information for linking PA ELF objects. 50 51 The first is the elf32_hppa_link_hash_table which is derived 52 from the standard ELF linker hash table. We use this as a place to 53 attach other hash tables and static information. 54 55 The second is the stub hash table which is derived from the 56 base BFD hash table. The stub hash table holds the information 57 necessary to build the linker stubs during a link. 58 59 There are a number of different stubs generated by the linker. 60 61 Long branch stub: 62 : ldil LR'X,%r1 63 : be,n RR'X(%sr4,%r1) 64 65 PIC long branch stub: 66 : b,l .+8,%r1 67 : addil LR'X - ($PIC_pcrel$0 - 4),%r1 68 : be,n RR'X - ($PIC_pcrel$0 - 8)(%sr4,%r1) 69 70 Import stub to call shared library routine from normal object file 71 (single sub-space version) 72 : addil LR'lt_ptr+ltoff,%dp ; get procedure entry point 73 : ldw RR'lt_ptr+ltoff(%r1),%r21 74 : bv %r0(%r21) 75 : ldw RR'lt_ptr+ltoff+4(%r1),%r19 ; get new dlt value. 76 77 Import stub to call shared library routine from shared library 78 (single sub-space version) 79 : addil LR'ltoff,%r19 ; get procedure entry point 80 : ldw RR'ltoff(%r1),%r21 81 : bv %r0(%r21) 82 : ldw RR'ltoff+4(%r1),%r19 ; get new dlt value. 83 84 Import stub to call shared library routine from normal object file 85 (multiple sub-space support) 86 : addil LR'lt_ptr+ltoff,%dp ; get procedure entry point 87 : ldw RR'lt_ptr+ltoff(%r1),%r21 88 : ldw RR'lt_ptr+ltoff+4(%r1),%r19 ; get new dlt value. 89 : ldsid (%r21),%r1 90 : mtsp %r1,%sr0 91 : be 0(%sr0,%r21) ; branch to target 92 : stw %rp,-24(%sp) ; save rp 93 94 Import stub to call shared library routine from shared library 95 (multiple sub-space support) 96 : addil LR'ltoff,%r19 ; get procedure entry point 97 : ldw RR'ltoff(%r1),%r21 98 : ldw RR'ltoff+4(%r1),%r19 ; get new dlt value. 99 : ldsid (%r21),%r1 100 : mtsp %r1,%sr0 101 : be 0(%sr0,%r21) ; branch to target 102 : stw %rp,-24(%sp) ; save rp 103 104 Export stub to return from shared lib routine (multiple sub-space support) 105 One of these is created for each exported procedure in a shared 106 library (and stored in the shared lib). Shared lib routines are 107 called via the first instruction in the export stub so that we can 108 do an inter-space return. Not required for single sub-space. 109 : bl,n X,%rp ; trap the return 110 : nop 111 : ldw -24(%sp),%rp ; restore the original rp 112 : ldsid (%rp),%r1 113 : mtsp %r1,%sr0 114 : be,n 0(%sr0,%rp) ; inter-space return */ 115 116 #define PLT_ENTRY_SIZE 8 117 #define PLABEL_PLT_ENTRY_SIZE PLT_ENTRY_SIZE 118 #define GOT_ENTRY_SIZE 4 119 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1" 120 121 static const bfd_byte plt_stub[] = 122 { 123 0x0e, 0x80, 0x10, 0x96, /* 1: ldw 0(%r20),%r22 */ 124 0xea, 0xc0, 0xc0, 0x00, /* bv %r0(%r22) */ 125 0x0e, 0x88, 0x10, 0x95, /* ldw 4(%r20),%r21 */ 126 #define PLT_STUB_ENTRY (3*4) 127 0xea, 0x9f, 0x1f, 0xdd, /* b,l 1b,%r20 */ 128 0xd6, 0x80, 0x1c, 0x1e, /* depi 0,31,2,%r20 */ 129 0x00, 0xc0, 0xff, 0xee, /* 9: .word fixup_func */ 130 0xde, 0xad, 0xbe, 0xef /* .word fixup_ltp */ 131 }; 132 133 /* Section name for stubs is the associated section name plus this 134 string. */ 135 #define STUB_SUFFIX ".stub" 136 137 /* Setting the following non-zero makes all long branch stubs 138 generated during a shared link of the PIC variety. This saves on 139 relocs, but costs one extra instruction per stub. */ 140 #ifndef LONG_BRANCH_PIC_IN_SHLIB 141 #define LONG_BRANCH_PIC_IN_SHLIB 1 142 #endif 143 144 /* Set this non-zero to use import stubs instead of long branch stubs 145 where a .plt entry exists for the symbol. This is a fairly useless 146 option as import stubs are bigger than PIC long branch stubs. */ 147 #ifndef LONG_BRANCH_VIA_PLT 148 #define LONG_BRANCH_VIA_PLT 0 149 #endif 150 151 /* We don't need to copy any PC- or GP-relative dynamic relocs into a 152 shared object's dynamic section. */ 153 #ifndef RELATIVE_DYNAMIC_RELOCS 154 #define RELATIVE_DYNAMIC_RELOCS 0 155 #endif 156 157 enum elf32_hppa_stub_type { 158 hppa_stub_long_branch, 159 hppa_stub_long_branch_shared, 160 hppa_stub_import, 161 hppa_stub_import_shared, 162 hppa_stub_export, 163 hppa_stub_none 164 }; 165 166 struct elf32_hppa_stub_hash_entry { 167 168 /* Base hash table entry structure. */ 169 struct bfd_hash_entry root; 170 171 /* The stub section. */ 172 asection *stub_sec; 173 174 #if ! LONG_BRANCH_PIC_IN_SHLIB 175 /* It's associated reloc section. */ 176 asection *reloc_sec; 177 #endif 178 179 /* Offset within stub_sec of the beginning of this stub. */ 180 bfd_vma stub_offset; 181 182 /* Given the symbol's value and its section we can determine its final 183 value when building the stubs (so the stub knows where to jump. */ 184 bfd_vma target_value; 185 asection *target_section; 186 187 enum elf32_hppa_stub_type stub_type; 188 189 /* The symbol table entry, if any, that this was derived from. */ 190 struct elf32_hppa_link_hash_entry *h; 191 192 /* Where this stub is being called from, or, in the case of combined 193 stub sections, the first input section in the group. */ 194 asection *id_sec; 195 }; 196 197 struct elf32_hppa_link_hash_entry { 198 199 struct elf_link_hash_entry elf; 200 201 /* A pointer to the most recently used stub hash entry against this 202 symbol. */ 203 struct elf32_hppa_stub_hash_entry *stub_cache; 204 205 #if ! LONG_BRANCH_PIC_IN_SHLIB 206 /* Used to track whether we have allocated space for a long branch 207 stub relocation for this symbol in the given section. */ 208 asection *stub_reloc_sec; 209 #endif 210 211 #if ! LONG_BRANCH_PIC_IN_SHLIB || RELATIVE_DYNAMIC_RELOCS 212 /* Used to count relocations for delayed sizing of relocation 213 sections. */ 214 struct elf32_hppa_dyn_reloc_entry { 215 216 /* Next relocation in the chain. */ 217 struct elf32_hppa_dyn_reloc_entry *next; 218 219 /* The section in dynobj. */ 220 asection *section; 221 222 /* Number of relocs copied in this section. */ 223 bfd_size_type count; 224 } *reloc_entries; 225 #endif 226 227 /* Set during a static link if we detect a function is PIC. */ 228 unsigned int maybe_pic_call:1; 229 230 /* Set if the only reason we need a .plt entry is for a non-PIC to 231 PIC function call. */ 232 unsigned int pic_call:1; 233 234 /* Set if this symbol is used by a plabel reloc. */ 235 unsigned int plabel:1; 236 237 /* Set if this symbol is an init or fini function and thus should 238 use an absolute reloc. */ 239 unsigned int plt_abs:1; 240 }; 241 242 struct elf32_hppa_link_hash_table { 243 244 /* The main hash table. */ 245 struct elf_link_hash_table root; 246 247 /* The stub hash table. */ 248 struct bfd_hash_table stub_hash_table; 249 250 /* Linker stub bfd. */ 251 bfd *stub_bfd; 252 253 /* Linker call-backs. */ 254 asection * (*add_stub_section) PARAMS ((const char *, asection *)); 255 void (*layout_sections_again) PARAMS ((void)); 256 257 /* Array to keep track of which stub sections have been created, and 258 information on stub grouping. */ 259 struct map_stub { 260 /* This is the section to which stubs in the group will be 261 attached. */ 262 asection *link_sec; 263 /* The stub section. */ 264 asection *stub_sec; 265 #if ! LONG_BRANCH_PIC_IN_SHLIB 266 /* The stub section's reloc section. */ 267 asection *reloc_sec; 268 #endif 269 } *stub_group; 270 271 /* Short-cuts to get to dynamic linker sections. */ 272 asection *sgot; 273 asection *srelgot; 274 asection *splt; 275 asection *srelplt; 276 asection *sdynbss; 277 asection *srelbss; 278 279 /* Used during a final link to store the base of the text and data 280 segments so that we can perform SEGREL relocations. */ 281 bfd_vma text_segment_base; 282 bfd_vma data_segment_base; 283 284 /* Whether we support multiple sub-spaces for shared libs. */ 285 unsigned int multi_subspace:1; 286 287 /* Flags set when PCREL12F and PCREL17F branches detected. Used to 288 select suitable defaults for the stub group size. */ 289 unsigned int has_12bit_branch:1; 290 unsigned int has_17bit_branch:1; 291 292 /* Set if we need a .plt stub to support lazy dynamic linking. */ 293 unsigned int need_plt_stub:1; 294 }; 295 296 /* Various hash macros and functions. */ 297 #define hppa_link_hash_table(p) \ 298 ((struct elf32_hppa_link_hash_table *) ((p)->hash)) 299 300 #define hppa_stub_hash_lookup(table, string, create, copy) \ 301 ((struct elf32_hppa_stub_hash_entry *) \ 302 bfd_hash_lookup ((table), (string), (create), (copy))) 303 304 static struct bfd_hash_entry *stub_hash_newfunc 305 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); 306 307 static struct bfd_hash_entry *hppa_link_hash_newfunc 308 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); 309 310 static struct bfd_link_hash_table *elf32_hppa_link_hash_table_create 311 PARAMS ((bfd *)); 312 313 /* Stub handling functions. */ 314 static char *hppa_stub_name 315 PARAMS ((const asection *, const asection *, 316 const struct elf32_hppa_link_hash_entry *, 317 const Elf_Internal_Rela *)); 318 319 static struct elf32_hppa_stub_hash_entry *hppa_get_stub_entry 320 PARAMS ((const asection *, const asection *, 321 struct elf32_hppa_link_hash_entry *, 322 const Elf_Internal_Rela *, 323 struct elf32_hppa_link_hash_table *)); 324 325 static struct elf32_hppa_stub_hash_entry *hppa_add_stub 326 PARAMS ((const char *, asection *, struct elf32_hppa_link_hash_table *)); 327 328 static enum elf32_hppa_stub_type hppa_type_of_stub 329 PARAMS ((asection *, const Elf_Internal_Rela *, 330 struct elf32_hppa_link_hash_entry *, bfd_vma)); 331 332 static boolean hppa_build_one_stub 333 PARAMS ((struct bfd_hash_entry *, PTR)); 334 335 static boolean hppa_size_one_stub 336 PARAMS ((struct bfd_hash_entry *, PTR)); 337 338 /* BFD and elf backend functions. */ 339 static boolean elf32_hppa_object_p PARAMS ((bfd *)); 340 341 static boolean elf32_hppa_add_symbol_hook 342 PARAMS ((bfd *, struct bfd_link_info *, const Elf_Internal_Sym *, 343 const char **, flagword *, asection **, bfd_vma *)); 344 345 static boolean elf32_hppa_create_dynamic_sections 346 PARAMS ((bfd *, struct bfd_link_info *)); 347 348 static boolean elf32_hppa_check_relocs 349 PARAMS ((bfd *, struct bfd_link_info *, 350 asection *, const Elf_Internal_Rela *)); 351 352 static asection *elf32_hppa_gc_mark_hook 353 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, 354 struct elf_link_hash_entry *, Elf_Internal_Sym *)); 355 356 static boolean elf32_hppa_gc_sweep_hook 357 PARAMS ((bfd *, struct bfd_link_info *, 358 asection *, const Elf_Internal_Rela *)); 359 360 static void elf32_hppa_hide_symbol 361 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); 362 363 static boolean elf32_hppa_adjust_dynamic_symbol 364 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); 365 366 static boolean hppa_handle_PIC_calls 367 PARAMS ((struct elf_link_hash_entry *, PTR)); 368 369 static boolean allocate_plt_and_got 370 PARAMS ((struct elf_link_hash_entry *, PTR)); 371 372 #if ((! LONG_BRANCH_PIC_IN_SHLIB && LONG_BRANCH_VIA_PLT) \ 373 || RELATIVE_DYNAMIC_RELOCS) 374 static boolean hppa_discard_copies 375 PARAMS ((struct elf_link_hash_entry *, PTR)); 376 #endif 377 378 static boolean clobber_millicode_symbols 379 PARAMS ((struct elf_link_hash_entry *, struct bfd_link_info *)); 380 381 static boolean elf32_hppa_size_dynamic_sections 382 PARAMS ((bfd *, struct bfd_link_info *)); 383 384 static boolean elf32_hppa_final_link 385 PARAMS ((bfd *, struct bfd_link_info *)); 386 387 static void hppa_record_segment_addr 388 PARAMS ((bfd *, asection *, PTR)); 389 390 static bfd_reloc_status_type final_link_relocate 391 PARAMS ((asection *, bfd_byte *, const Elf_Internal_Rela *, 392 bfd_vma, struct elf32_hppa_link_hash_table *, asection *, 393 struct elf32_hppa_link_hash_entry *)); 394 395 static boolean elf32_hppa_relocate_section 396 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, 397 bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); 398 399 static int hppa_unwind_entry_compare 400 PARAMS ((const PTR, const PTR)); 401 402 static boolean elf32_hppa_finish_dynamic_symbol 403 PARAMS ((bfd *, struct bfd_link_info *, 404 struct elf_link_hash_entry *, Elf_Internal_Sym *)); 405 406 static boolean elf32_hppa_finish_dynamic_sections 407 PARAMS ((bfd *, struct bfd_link_info *)); 408 409 static void elf32_hppa_post_process_headers 410 PARAMS ((bfd *, struct bfd_link_info *)); 411 412 static int elf32_hppa_elf_get_symbol_type 413 PARAMS ((Elf_Internal_Sym *, int)); 414 415 /* Assorted hash table functions. */ 416 417 /* Initialize an entry in the stub hash table. */ 418 419 static struct bfd_hash_entry * 420 stub_hash_newfunc (entry, table, string) 421 struct bfd_hash_entry *entry; 422 struct bfd_hash_table *table; 423 const char *string; 424 { 425 struct elf32_hppa_stub_hash_entry *ret; 426 427 ret = (struct elf32_hppa_stub_hash_entry *) entry; 428 429 /* Allocate the structure if it has not already been allocated by a 430 subclass. */ 431 if (ret == NULL) 432 { 433 ret = ((struct elf32_hppa_stub_hash_entry *) 434 bfd_hash_allocate (table, 435 sizeof (struct elf32_hppa_stub_hash_entry))); 436 if (ret == NULL) 437 return NULL; 438 } 439 440 /* Call the allocation method of the superclass. */ 441 ret = ((struct elf32_hppa_stub_hash_entry *) 442 bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string)); 443 444 if (ret) 445 { 446 /* Initialize the local fields. */ 447 ret->stub_sec = NULL; 448 #if ! LONG_BRANCH_PIC_IN_SHLIB 449 ret->reloc_sec = NULL; 450 #endif 451 ret->stub_offset = 0; 452 ret->target_value = 0; 453 ret->target_section = NULL; 454 ret->stub_type = hppa_stub_long_branch; 455 ret->h = NULL; 456 ret->id_sec = NULL; 457 } 458 459 return (struct bfd_hash_entry *) ret; 460 } 461 462 /* Initialize an entry in the link hash table. */ 463 464 static struct bfd_hash_entry * 465 hppa_link_hash_newfunc (entry, table, string) 466 struct bfd_hash_entry *entry; 467 struct bfd_hash_table *table; 468 const char *string; 469 { 470 struct elf32_hppa_link_hash_entry *ret; 471 472 ret = (struct elf32_hppa_link_hash_entry *) entry; 473 474 /* Allocate the structure if it has not already been allocated by a 475 subclass. */ 476 if (ret == NULL) 477 { 478 ret = ((struct elf32_hppa_link_hash_entry *) 479 bfd_hash_allocate (table, 480 sizeof (struct elf32_hppa_link_hash_entry))); 481 if (ret == NULL) 482 return NULL; 483 } 484 485 /* Call the allocation method of the superclass. */ 486 ret = ((struct elf32_hppa_link_hash_entry *) 487 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 488 table, string)); 489 490 if (ret) 491 { 492 /* Initialize the local fields. */ 493 #if ! LONG_BRANCH_PIC_IN_SHLIB 494 ret->stub_reloc_sec = NULL; 495 #endif 496 ret->stub_cache = NULL; 497 #if ! LONG_BRANCH_PIC_IN_SHLIB || RELATIVE_DYNAMIC_RELOCS 498 ret->reloc_entries = NULL; 499 #endif 500 ret->maybe_pic_call = 0; 501 ret->pic_call = 0; 502 ret->plabel = 0; 503 ret->plt_abs = 0; 504 } 505 506 return (struct bfd_hash_entry *) ret; 507 } 508 509 /* Create the derived linker hash table. The PA ELF port uses the derived 510 hash table to keep information specific to the PA ELF linker (without 511 using static variables). */ 512 513 static struct bfd_link_hash_table * 514 elf32_hppa_link_hash_table_create (abfd) 515 bfd *abfd; 516 { 517 struct elf32_hppa_link_hash_table *ret; 518 519 ret = ((struct elf32_hppa_link_hash_table *) bfd_alloc (abfd, sizeof (*ret))); 520 if (ret == NULL) 521 return NULL; 522 523 if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, hppa_link_hash_newfunc)) 524 { 525 bfd_release (abfd, ret); 526 return NULL; 527 } 528 529 /* Init the stub hash table too. */ 530 if (!bfd_hash_table_init (&ret->stub_hash_table, stub_hash_newfunc)) 531 return NULL; 532 533 ret->stub_bfd = NULL; 534 ret->add_stub_section = NULL; 535 ret->layout_sections_again = NULL; 536 ret->stub_group = NULL; 537 ret->sgot = NULL; 538 ret->srelgot = NULL; 539 ret->splt = NULL; 540 ret->srelplt = NULL; 541 ret->sdynbss = NULL; 542 ret->srelbss = NULL; 543 ret->text_segment_base = (bfd_vma) -1; 544 ret->data_segment_base = (bfd_vma) -1; 545 ret->multi_subspace = 0; 546 ret->has_12bit_branch = 0; 547 ret->has_17bit_branch = 0; 548 ret->need_plt_stub = 0; 549 550 return &ret->root.root; 551 } 552 553 /* Build a name for an entry in the stub hash table. */ 554 555 static char * 556 hppa_stub_name (input_section, sym_sec, hash, rel) 557 const asection *input_section; 558 const asection *sym_sec; 559 const struct elf32_hppa_link_hash_entry *hash; 560 const Elf_Internal_Rela *rel; 561 { 562 char *stub_name; 563 size_t len; 564 565 if (hash) 566 { 567 len = 8 + 1 + strlen (hash->elf.root.root.string) + 1 + 8 + 1; 568 stub_name = bfd_malloc (len); 569 if (stub_name != NULL) 570 { 571 sprintf (stub_name, "%08x_%s+%x", 572 input_section->id & 0xffffffff, 573 hash->elf.root.root.string, 574 (int) rel->r_addend & 0xffffffff); 575 } 576 } 577 else 578 { 579 len = 8 + 1 + 8 + 1 + 8 + 1 + 8 + 1; 580 stub_name = bfd_malloc (len); 581 if (stub_name != NULL) 582 { 583 sprintf (stub_name, "%08x_%x:%x+%x", 584 input_section->id & 0xffffffff, 585 sym_sec->id & 0xffffffff, 586 (int) ELF32_R_SYM (rel->r_info) & 0xffffffff, 587 (int) rel->r_addend & 0xffffffff); 588 } 589 } 590 return stub_name; 591 } 592 593 /* Look up an entry in the stub hash. Stub entries are cached because 594 creating the stub name takes a bit of time. */ 595 596 static struct elf32_hppa_stub_hash_entry * 597 hppa_get_stub_entry (input_section, sym_sec, hash, rel, hplink) 598 const asection *input_section; 599 const asection *sym_sec; 600 struct elf32_hppa_link_hash_entry *hash; 601 const Elf_Internal_Rela *rel; 602 struct elf32_hppa_link_hash_table *hplink; 603 { 604 struct elf32_hppa_stub_hash_entry *stub_entry; 605 const asection *id_sec; 606 607 /* If this input section is part of a group of sections sharing one 608 stub section, then use the id of the first section in the group. 609 Stub names need to include a section id, as there may well be 610 more than one stub used to reach say, printf, and we need to 611 distinguish between them. */ 612 id_sec = hplink->stub_group[input_section->id].link_sec; 613 614 if (hash != NULL && hash->stub_cache != NULL 615 && hash->stub_cache->h == hash 616 && hash->stub_cache->id_sec == id_sec) 617 { 618 stub_entry = hash->stub_cache; 619 } 620 else 621 { 622 char *stub_name; 623 624 stub_name = hppa_stub_name (id_sec, sym_sec, hash, rel); 625 if (stub_name == NULL) 626 return NULL; 627 628 stub_entry = hppa_stub_hash_lookup (&hplink->stub_hash_table, 629 stub_name, false, false); 630 if (stub_entry == NULL) 631 { 632 if (hash == NULL || hash->elf.root.type != bfd_link_hash_undefweak) 633 (*_bfd_error_handler) (_("%s(%s+0x%lx): cannot find stub entry %s"), 634 bfd_get_filename (input_section->owner), 635 input_section->name, 636 (long) rel->r_offset, 637 stub_name); 638 } 639 else 640 { 641 if (hash != NULL) 642 hash->stub_cache = stub_entry; 643 } 644 645 free (stub_name); 646 } 647 648 return stub_entry; 649 } 650 651 /* Add a new stub entry to the stub hash. Not all fields of the new 652 stub entry are initialised. */ 653 654 static struct elf32_hppa_stub_hash_entry * 655 hppa_add_stub (stub_name, section, hplink) 656 const char *stub_name; 657 asection *section; 658 struct elf32_hppa_link_hash_table *hplink; 659 { 660 asection *link_sec; 661 asection *stub_sec; 662 struct elf32_hppa_stub_hash_entry *stub_entry; 663 664 link_sec = hplink->stub_group[section->id].link_sec; 665 stub_sec = hplink->stub_group[section->id].stub_sec; 666 if (stub_sec == NULL) 667 { 668 stub_sec = hplink->stub_group[link_sec->id].stub_sec; 669 if (stub_sec == NULL) 670 { 671 size_t len; 672 char *s_name; 673 674 len = strlen (link_sec->name) + sizeof (STUB_SUFFIX); 675 s_name = bfd_alloc (hplink->stub_bfd, len); 676 if (s_name == NULL) 677 return NULL; 678 679 strcpy (s_name, link_sec->name); 680 strcpy (s_name + len - sizeof (STUB_SUFFIX), STUB_SUFFIX); 681 stub_sec = (*hplink->add_stub_section) (s_name, link_sec); 682 if (stub_sec == NULL) 683 return NULL; 684 hplink->stub_group[link_sec->id].stub_sec = stub_sec; 685 } 686 hplink->stub_group[section->id].stub_sec = stub_sec; 687 } 688 689 /* Enter this entry into the linker stub hash table. */ 690 stub_entry = hppa_stub_hash_lookup (&hplink->stub_hash_table, stub_name, 691 true, false); 692 if (stub_entry == NULL) 693 { 694 (*_bfd_error_handler) (_("%s: cannot create stub entry %s"), 695 bfd_get_filename (section->owner), 696 stub_name); 697 return NULL; 698 } 699 700 stub_entry->stub_sec = stub_sec; 701 #if ! LONG_BRANCH_PIC_IN_SHLIB 702 stub_entry->reloc_sec = hplink->stub_group[section->id].reloc_sec; 703 #endif 704 stub_entry->stub_offset = 0; 705 stub_entry->id_sec = link_sec; 706 return stub_entry; 707 } 708 709 /* Determine the type of stub needed, if any, for a call. */ 710 711 static enum elf32_hppa_stub_type 712 hppa_type_of_stub (input_sec, rel, hash, destination) 713 asection *input_sec; 714 const Elf_Internal_Rela *rel; 715 struct elf32_hppa_link_hash_entry *hash; 716 bfd_vma destination; 717 { 718 bfd_vma location; 719 bfd_vma branch_offset; 720 bfd_vma max_branch_offset; 721 unsigned int r_type; 722 723 if (hash != NULL 724 && (((hash->elf.root.type == bfd_link_hash_defined 725 || hash->elf.root.type == bfd_link_hash_defweak) 726 && hash->elf.root.u.def.section->output_section == NULL) 727 || (hash->elf.root.type == bfd_link_hash_defweak 728 && hash->elf.dynindx != -1 729 && hash->elf.plt.offset != (bfd_vma) -1) 730 || hash->elf.root.type == bfd_link_hash_undefweak 731 || hash->elf.root.type == bfd_link_hash_undefined 732 || (hash->maybe_pic_call && !(input_sec->flags & SEC_HAS_GOT_REF)))) 733 { 734 /* If output_section is NULL, then it's a symbol defined in a 735 shared library. We will need an import stub. Decide between 736 hppa_stub_import and hppa_stub_import_shared later. For 737 shared links we need stubs for undefined or weak syms too; 738 They will presumably be resolved by the dynamic linker. */ 739 return hppa_stub_import; 740 } 741 742 /* Determine where the call point is. */ 743 location = (input_sec->output_offset 744 + input_sec->output_section->vma 745 + rel->r_offset); 746 747 branch_offset = destination - location - 8; 748 r_type = ELF32_R_TYPE (rel->r_info); 749 750 /* Determine if a long branch stub is needed. parisc branch offsets 751 are relative to the second instruction past the branch, ie. +8 752 bytes on from the branch instruction location. The offset is 753 signed and counts in units of 4 bytes. */ 754 if (r_type == (unsigned int) R_PARISC_PCREL17F) 755 { 756 max_branch_offset = (1 << (17-1)) << 2; 757 } 758 else if (r_type == (unsigned int) R_PARISC_PCREL12F) 759 { 760 max_branch_offset = (1 << (12-1)) << 2; 761 } 762 else /* R_PARISC_PCREL22F. */ 763 { 764 max_branch_offset = (1 << (22-1)) << 2; 765 } 766 767 if (branch_offset + max_branch_offset >= 2*max_branch_offset) 768 { 769 #if LONG_BRANCH_VIA_PLT 770 if (hash != NULL 771 && hash->elf.dynindx != -1 772 && hash->elf.plt.offset != (bfd_vma) -1 773 && hash->elf.type != STT_PARISC_MILLI) 774 { 775 /* If we are doing a shared link and find we need a long 776 branch stub, then go via the .plt if possible. */ 777 return hppa_stub_import; 778 } 779 else 780 #endif 781 return hppa_stub_long_branch; 782 } 783 return hppa_stub_none; 784 } 785 786 /* Build one linker stub as defined by the stub hash table entry GEN_ENTRY. 787 IN_ARG contains the link info pointer. */ 788 789 #define LDIL_R1 0x20200000 /* ldil LR'XXX,%r1 */ 790 #define BE_SR4_R1 0xe0202002 /* be,n RR'XXX(%sr4,%r1) */ 791 792 #define BL_R1 0xe8200000 /* b,l .+8,%r1 */ 793 #define ADDIL_R1 0x28200000 /* addil LR'XXX,%r1,%r1 */ 794 #define DEPI_R1 0xd4201c1e /* depi 0,31,2,%r1 */ 795 796 #define ADDIL_DP 0x2b600000 /* addil LR'XXX,%dp,%r1 */ 797 #define LDW_R1_R21 0x48350000 /* ldw RR'XXX(%sr0,%r1),%r21 */ 798 #define BV_R0_R21 0xeaa0c000 /* bv %r0(%r21) */ 799 #define LDW_R1_R19 0x48330000 /* ldw RR'XXX(%sr0,%r1),%r19 */ 800 801 #define ADDIL_R19 0x2a600000 /* addil LR'XXX,%r19,%r1 */ 802 #define LDW_R1_DP 0x483b0000 /* ldw RR'XXX(%sr0,%r1),%dp */ 803 804 #define LDSID_R21_R1 0x02a010a1 /* ldsid (%sr0,%r21),%r1 */ 805 #define MTSP_R1 0x00011820 /* mtsp %r1,%sr0 */ 806 #define BE_SR0_R21 0xe2a00000 /* be 0(%sr0,%r21) */ 807 #define STW_RP 0x6bc23fd1 /* stw %rp,-24(%sr0,%sp) */ 808 809 #define BL_RP 0xe8400002 /* b,l,n XXX,%rp */ 810 #define NOP 0x08000240 /* nop */ 811 #define LDW_RP 0x4bc23fd1 /* ldw -24(%sr0,%sp),%rp */ 812 #define LDSID_RP_R1 0x004010a1 /* ldsid (%sr0,%rp),%r1 */ 813 #define BE_SR0_RP 0xe0400002 /* be,n 0(%sr0,%rp) */ 814 815 #ifndef R19_STUBS 816 #define R19_STUBS 1 817 #endif 818 819 #if R19_STUBS 820 #define LDW_R1_DLT LDW_R1_R19 821 #else 822 #define LDW_R1_DLT LDW_R1_DP 823 #endif 824 825 static boolean 826 hppa_build_one_stub (gen_entry, in_arg) 827 struct bfd_hash_entry *gen_entry; 828 PTR in_arg; 829 { 830 struct elf32_hppa_stub_hash_entry *stub_entry; 831 struct bfd_link_info *info; 832 struct elf32_hppa_link_hash_table *hplink; 833 asection *stub_sec; 834 bfd *stub_bfd; 835 bfd_byte *loc; 836 bfd_vma sym_value; 837 bfd_vma insn; 838 bfd_vma off; 839 int val; 840 int size; 841 842 /* Massage our args to the form they really have. */ 843 stub_entry = (struct elf32_hppa_stub_hash_entry *) gen_entry; 844 info = (struct bfd_link_info *) in_arg; 845 846 hplink = hppa_link_hash_table (info); 847 stub_sec = stub_entry->stub_sec; 848 849 /* Make a note of the offset within the stubs for this entry. */ 850 stub_entry->stub_offset = stub_sec->_raw_size; 851 loc = stub_sec->contents + stub_entry->stub_offset; 852 853 stub_bfd = stub_sec->owner; 854 855 switch (stub_entry->stub_type) 856 { 857 case hppa_stub_long_branch: 858 /* Create the long branch. A long branch is formed with "ldil" 859 loading the upper bits of the target address into a register, 860 then branching with "be" which adds in the lower bits. 861 The "be" has its delay slot nullified. */ 862 sym_value = (stub_entry->target_value 863 + stub_entry->target_section->output_offset 864 + stub_entry->target_section->output_section->vma); 865 866 val = hppa_field_adjust (sym_value, (bfd_signed_vma) 0, e_lrsel); 867 insn = hppa_rebuild_insn ((int) LDIL_R1, val, 21); 868 bfd_put_32 (stub_bfd, insn, loc); 869 870 val = hppa_field_adjust (sym_value, (bfd_signed_vma) 0, e_rrsel) >> 2; 871 insn = hppa_rebuild_insn ((int) BE_SR4_R1, val, 17); 872 bfd_put_32 (stub_bfd, insn, loc + 4); 873 874 #if ! LONG_BRANCH_PIC_IN_SHLIB 875 if (info->shared) 876 { 877 /* Output a dynamic relocation for this stub. We only 878 output one PCREL21L reloc per stub, trusting that the 879 dynamic linker will also fix the implied PCREL17R for the 880 second instruction. PCREL21L dynamic relocs had better 881 never be emitted for some other purpose... */ 882 asection *srel; 883 Elf_Internal_Rela outrel; 884 885 if (stub_entry->h == NULL) 886 { 887 (*_bfd_error_handler) 888 (_("%s(%s+0x%lx): cannot relocate %s, recompile with -ffunction-sections"), 889 bfd_get_filename (stub_entry->target_section->owner), 890 stub_sec->name, 891 (long) stub_entry->stub_offset, 892 stub_entry->root.string); 893 bfd_set_error (bfd_error_bad_value); 894 return false; 895 } 896 897 srel = stub_entry->reloc_sec; 898 if (srel == NULL) 899 { 900 (*_bfd_error_handler) 901 (_("Could not find relocation section for %s"), 902 stub_sec->name); 903 bfd_set_error (bfd_error_bad_value); 904 return false; 905 } 906 907 outrel.r_offset = (stub_entry->stub_offset 908 + stub_sec->output_offset 909 + stub_sec->output_section->vma); 910 outrel.r_info = ELF32_R_INFO (0, R_PARISC_PCREL21L); 911 outrel.r_addend = sym_value; 912 bfd_elf32_swap_reloca_out (stub_sec->output_section->owner, 913 &outrel, 914 ((Elf32_External_Rela *) 915 srel->contents + srel->reloc_count)); 916 ++srel->reloc_count; 917 } 918 #endif 919 size = 8; 920 break; 921 922 case hppa_stub_long_branch_shared: 923 /* Branches are relative. This is where we are going to. */ 924 sym_value = (stub_entry->target_value 925 + stub_entry->target_section->output_offset 926 + stub_entry->target_section->output_section->vma); 927 928 /* And this is where we are coming from, more or less. */ 929 sym_value -= (stub_entry->stub_offset 930 + stub_sec->output_offset 931 + stub_sec->output_section->vma); 932 933 bfd_put_32 (stub_bfd, (bfd_vma) BL_R1, loc); 934 val = hppa_field_adjust (sym_value, (bfd_signed_vma) -8, e_lrsel); 935 insn = hppa_rebuild_insn ((int) ADDIL_R1, val, 21); 936 bfd_put_32 (stub_bfd, insn, loc + 4); 937 938 val = hppa_field_adjust (sym_value, (bfd_signed_vma) -8, e_rrsel) >> 2; 939 insn = hppa_rebuild_insn ((int) BE_SR4_R1, val, 17); 940 bfd_put_32 (stub_bfd, insn, loc + 8); 941 size = 12; 942 break; 943 944 case hppa_stub_import: 945 case hppa_stub_import_shared: 946 off = stub_entry->h->elf.plt.offset; 947 if (off >= (bfd_vma) -2) 948 abort (); 949 950 off &= ~ (bfd_vma) 1; 951 sym_value = (off 952 + hplink->splt->output_offset 953 + hplink->splt->output_section->vma 954 - elf_gp (hplink->splt->output_section->owner)); 955 956 insn = ADDIL_DP; 957 #if R19_STUBS 958 if (stub_entry->stub_type == hppa_stub_import_shared) 959 insn = ADDIL_R19; 960 #endif 961 val = hppa_field_adjust (sym_value, (bfd_signed_vma) 0, e_lrsel), 962 insn = hppa_rebuild_insn ((int) insn, val, 21); 963 bfd_put_32 (stub_bfd, insn, loc); 964 965 /* It is critical to use lrsel/rrsel here because we are using 966 two different offsets (+0 and +4) from sym_value. If we use 967 lsel/rsel then with unfortunate sym_values we will round 968 sym_value+4 up to the next 2k block leading to a mis-match 969 between the lsel and rsel value. */ 970 val = hppa_field_adjust (sym_value, (bfd_signed_vma) 0, e_rrsel); 971 insn = hppa_rebuild_insn ((int) LDW_R1_R21, val, 14); 972 bfd_put_32 (stub_bfd, insn, loc + 4); 973 974 if (hplink->multi_subspace) 975 { 976 val = hppa_field_adjust (sym_value, (bfd_signed_vma) 4, e_rrsel); 977 insn = hppa_rebuild_insn ((int) LDW_R1_DLT, val, 14); 978 bfd_put_32 (stub_bfd, insn, loc + 8); 979 980 bfd_put_32 (stub_bfd, (bfd_vma) LDSID_R21_R1, loc + 12); 981 bfd_put_32 (stub_bfd, (bfd_vma) MTSP_R1, loc + 16); 982 bfd_put_32 (stub_bfd, (bfd_vma) BE_SR0_R21, loc + 20); 983 bfd_put_32 (stub_bfd, (bfd_vma) STW_RP, loc + 24); 984 985 size = 28; 986 } 987 else 988 { 989 bfd_put_32 (stub_bfd, (bfd_vma) BV_R0_R21, loc + 8); 990 val = hppa_field_adjust (sym_value, (bfd_signed_vma) 4, e_rrsel); 991 insn = hppa_rebuild_insn ((int) LDW_R1_DLT, val, 14); 992 bfd_put_32 (stub_bfd, insn, loc + 12); 993 994 size = 16; 995 } 996 997 if (!info->shared 998 && stub_entry->h != NULL 999 && stub_entry->h->pic_call) 1000 { 1001 /* Build the .plt entry needed to call a PIC function from 1002 statically linked code. We don't need any relocs. */ 1003 bfd *dynobj; 1004 struct elf32_hppa_link_hash_entry *eh; 1005 bfd_vma value; 1006 1007 dynobj = hplink->root.dynobj; 1008 eh = (struct elf32_hppa_link_hash_entry *) stub_entry->h; 1009 1010 if (eh->elf.root.type != bfd_link_hash_defined 1011 && eh->elf.root.type != bfd_link_hash_defweak) 1012 abort (); 1013 1014 value = (eh->elf.root.u.def.value 1015 + eh->elf.root.u.def.section->output_offset 1016 + eh->elf.root.u.def.section->output_section->vma); 1017 1018 /* Fill in the entry in the procedure linkage table. 1019 1020 The format of a plt entry is 1021 <funcaddr> 1022 <__gp>. */ 1023 1024 bfd_put_32 (hplink->splt->owner, value, 1025 hplink->splt->contents + off); 1026 value = elf_gp (hplink->splt->output_section->owner); 1027 bfd_put_32 (hplink->splt->owner, value, 1028 hplink->splt->contents + off + 4); 1029 } 1030 break; 1031 1032 case hppa_stub_export: 1033 /* Branches are relative. This is where we are going to. */ 1034 sym_value = (stub_entry->target_value 1035 + stub_entry->target_section->output_offset 1036 + stub_entry->target_section->output_section->vma); 1037 1038 /* And this is where we are coming from. */ 1039 sym_value -= (stub_entry->stub_offset 1040 + stub_sec->output_offset 1041 + stub_sec->output_section->vma); 1042 1043 if (sym_value - 8 + 0x40000 >= 0x80000) 1044 { 1045 (*_bfd_error_handler) 1046 (_("%s(%s+0x%lx): cannot reach %s, recompile with -ffunction-sections"), 1047 bfd_get_filename (stub_entry->target_section->owner), 1048 stub_sec->name, 1049 (long) stub_entry->stub_offset, 1050 stub_entry->root.string); 1051 bfd_set_error (bfd_error_bad_value); 1052 return false; 1053 } 1054 1055 val = hppa_field_adjust (sym_value, (bfd_signed_vma) -8, e_fsel) >> 2; 1056 insn = hppa_rebuild_insn ((int) BL_RP, val, 17); 1057 bfd_put_32 (stub_bfd, insn, loc); 1058 1059 bfd_put_32 (stub_bfd, (bfd_vma) NOP, loc + 4); 1060 bfd_put_32 (stub_bfd, (bfd_vma) LDW_RP, loc + 8); 1061 bfd_put_32 (stub_bfd, (bfd_vma) LDSID_RP_R1, loc + 12); 1062 bfd_put_32 (stub_bfd, (bfd_vma) MTSP_R1, loc + 16); 1063 bfd_put_32 (stub_bfd, (bfd_vma) BE_SR0_RP, loc + 20); 1064 1065 /* Point the function symbol at the stub. */ 1066 stub_entry->h->elf.root.u.def.section = stub_sec; 1067 stub_entry->h->elf.root.u.def.value = stub_sec->_raw_size; 1068 1069 size = 24; 1070 break; 1071 1072 default: 1073 BFD_FAIL (); 1074 return false; 1075 } 1076 1077 stub_sec->_raw_size += size; 1078 return true; 1079 } 1080 1081 #undef LDIL_R1 1082 #undef BE_SR4_R1 1083 #undef BL_R1 1084 #undef ADDIL_R1 1085 #undef DEPI_R1 1086 #undef ADDIL_DP 1087 #undef LDW_R1_R21 1088 #undef LDW_R1_DLT 1089 #undef LDW_R1_R19 1090 #undef ADDIL_R19 1091 #undef LDW_R1_DP 1092 #undef LDSID_R21_R1 1093 #undef MTSP_R1 1094 #undef BE_SR0_R21 1095 #undef STW_RP 1096 #undef BV_R0_R21 1097 #undef BL_RP 1098 #undef NOP 1099 #undef LDW_RP 1100 #undef LDSID_RP_R1 1101 #undef BE_SR0_RP 1102 1103 /* As above, but don't actually build the stub. Just bump offset so 1104 we know stub section sizes. */ 1105 1106 static boolean 1107 hppa_size_one_stub (gen_entry, in_arg) 1108 struct bfd_hash_entry *gen_entry; 1109 PTR in_arg; 1110 { 1111 struct elf32_hppa_stub_hash_entry *stub_entry; 1112 struct elf32_hppa_link_hash_table *hplink; 1113 int size; 1114 1115 /* Massage our args to the form they really have. */ 1116 stub_entry = (struct elf32_hppa_stub_hash_entry *) gen_entry; 1117 hplink = (struct elf32_hppa_link_hash_table *) in_arg; 1118 1119 if (stub_entry->stub_type == hppa_stub_long_branch) 1120 { 1121 #if ! LONG_BRANCH_PIC_IN_SHLIB 1122 if (stub_entry->reloc_sec != NULL) 1123 stub_entry->reloc_sec->_raw_size += sizeof (Elf32_External_Rela); 1124 #endif 1125 size = 8; 1126 } 1127 else if (stub_entry->stub_type == hppa_stub_long_branch_shared) 1128 size = 12; 1129 else if (stub_entry->stub_type == hppa_stub_export) 1130 size = 24; 1131 else /* hppa_stub_import or hppa_stub_import_shared. */ 1132 { 1133 if (hplink->multi_subspace) 1134 size = 28; 1135 else 1136 size = 16; 1137 } 1138 1139 stub_entry->stub_sec->_raw_size += size; 1140 return true; 1141 } 1142 1143 /* Return nonzero if ABFD represents an HPPA ELF32 file. 1144 Additionally we set the default architecture and machine. */ 1145 1146 static boolean 1147 elf32_hppa_object_p (abfd) 1148 bfd *abfd; 1149 { 1150 Elf_Internal_Ehdr * i_ehdrp; 1151 unsigned int flags; 1152 1153 i_ehdrp = elf_elfheader (abfd); 1154 if (strcmp (bfd_get_target (abfd), "elf32-hppa-linux") == 0) 1155 { 1156 if (i_ehdrp->e_ident[EI_OSABI] != ELFOSABI_LINUX) 1157 return false; 1158 } 1159 else 1160 { 1161 if (i_ehdrp->e_ident[EI_OSABI] != ELFOSABI_HPUX) 1162 return false; 1163 } 1164 1165 flags = i_ehdrp->e_flags; 1166 switch (flags & (EF_PARISC_ARCH | EF_PARISC_WIDE)) 1167 { 1168 case EFA_PARISC_1_0: 1169 return bfd_default_set_arch_mach (abfd, bfd_arch_hppa, 10); 1170 case EFA_PARISC_1_1: 1171 return bfd_default_set_arch_mach (abfd, bfd_arch_hppa, 11); 1172 case EFA_PARISC_2_0: 1173 return bfd_default_set_arch_mach (abfd, bfd_arch_hppa, 20); 1174 case EFA_PARISC_2_0 | EF_PARISC_WIDE: 1175 return bfd_default_set_arch_mach (abfd, bfd_arch_hppa, 25); 1176 } 1177 return true; 1178 } 1179 1180 /* Undo the generic ELF code's subtraction of section->vma from the 1181 value of each external symbol. */ 1182 1183 static boolean 1184 elf32_hppa_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp) 1185 bfd *abfd ATTRIBUTE_UNUSED; 1186 struct bfd_link_info *info ATTRIBUTE_UNUSED; 1187 const Elf_Internal_Sym *sym ATTRIBUTE_UNUSED; 1188 const char **namep ATTRIBUTE_UNUSED; 1189 flagword *flagsp ATTRIBUTE_UNUSED; 1190 asection **secp; 1191 bfd_vma *valp; 1192 { 1193 *valp += (*secp)->vma; 1194 return true; 1195 } 1196 1197 /* Create the .plt and .got sections, and set up our hash table 1198 short-cuts to various dynamic sections. */ 1199 1200 static boolean 1201 elf32_hppa_create_dynamic_sections (abfd, info) 1202 bfd *abfd; 1203 struct bfd_link_info *info; 1204 { 1205 struct elf32_hppa_link_hash_table *hplink; 1206 1207 /* Don't try to create the .plt and .got twice. */ 1208 hplink = hppa_link_hash_table (info); 1209 if (hplink->splt != NULL) 1210 return true; 1211 1212 /* Call the generic code to do most of the work. */ 1213 if (! _bfd_elf_create_dynamic_sections (abfd, info)) 1214 return false; 1215 1216 hplink->splt = bfd_get_section_by_name (abfd, ".plt"); 1217 hplink->srelplt = bfd_get_section_by_name (abfd, ".rela.plt"); 1218 1219 hplink->sgot = bfd_get_section_by_name (abfd, ".got"); 1220 hplink->srelgot = bfd_make_section (abfd, ".rela.got"); 1221 if (hplink->srelgot == NULL 1222 || ! bfd_set_section_flags (abfd, hplink->srelgot, 1223 (SEC_ALLOC 1224 | SEC_LOAD 1225 | SEC_HAS_CONTENTS 1226 | SEC_IN_MEMORY 1227 | SEC_LINKER_CREATED 1228 | SEC_READONLY)) 1229 || ! bfd_set_section_alignment (abfd, hplink->srelgot, 2)) 1230 return false; 1231 1232 hplink->sdynbss = bfd_get_section_by_name (abfd, ".dynbss"); 1233 hplink->srelbss = bfd_get_section_by_name (abfd, ".rela.bss"); 1234 1235 return true; 1236 } 1237 1238 /* Look through the relocs for a section during the first phase, and 1239 allocate space in the global offset table or procedure linkage 1240 table. At this point we haven't necessarily read all the input 1241 files. */ 1242 1243 static boolean 1244 elf32_hppa_check_relocs (abfd, info, sec, relocs) 1245 bfd *abfd; 1246 struct bfd_link_info *info; 1247 asection *sec; 1248 const Elf_Internal_Rela *relocs; 1249 { 1250 bfd *dynobj; 1251 Elf_Internal_Shdr *symtab_hdr; 1252 struct elf_link_hash_entry **sym_hashes; 1253 bfd_signed_vma *local_got_refcounts; 1254 const Elf_Internal_Rela *rel; 1255 const Elf_Internal_Rela *rel_end; 1256 struct elf32_hppa_link_hash_table *hplink; 1257 asection *sreloc; 1258 asection *stubreloc; 1259 1260 if (info->relocateable) 1261 return true; 1262 1263 hplink = hppa_link_hash_table (info); 1264 dynobj = hplink->root.dynobj; 1265 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1266 sym_hashes = elf_sym_hashes (abfd); 1267 local_got_refcounts = elf_local_got_refcounts (abfd); 1268 sreloc = NULL; 1269 stubreloc = NULL; 1270 1271 rel_end = relocs + sec->reloc_count; 1272 for (rel = relocs; rel < rel_end; rel++) 1273 { 1274 enum { 1275 NEED_GOT = 1, 1276 NEED_PLT = 2, 1277 NEED_DYNREL = 4, 1278 #if LONG_BRANCH_PIC_IN_SHLIB 1279 NEED_STUBREL = 0, /* We won't be needing them in this case. */ 1280 #else 1281 NEED_STUBREL = 8, 1282 #endif 1283 PLT_PLABEL = 16 1284 }; 1285 1286 unsigned int r_symndx, r_type; 1287 struct elf32_hppa_link_hash_entry *h; 1288 int need_entry; 1289 1290 r_symndx = ELF32_R_SYM (rel->r_info); 1291 1292 if (r_symndx < symtab_hdr->sh_info) 1293 h = NULL; 1294 else 1295 h = ((struct elf32_hppa_link_hash_entry *) 1296 sym_hashes[r_symndx - symtab_hdr->sh_info]); 1297 1298 r_type = ELF32_R_TYPE (rel->r_info); 1299 1300 switch (r_type) 1301 { 1302 case R_PARISC_DLTIND14F: 1303 case R_PARISC_DLTIND14R: 1304 case R_PARISC_DLTIND21L: 1305 /* This symbol requires a global offset table entry. */ 1306 need_entry = NEED_GOT; 1307 1308 /* Mark this section as containing PIC code. */ 1309 sec->flags |= SEC_HAS_GOT_REF; 1310 break; 1311 1312 case R_PARISC_PLABEL14R: /* "Official" procedure labels. */ 1313 case R_PARISC_PLABEL21L: 1314 case R_PARISC_PLABEL32: 1315 /* If the addend is non-zero, we break badly. */ 1316 if (rel->r_addend != 0) 1317 abort (); 1318 1319 /* If we are creating a shared library, then we need to 1320 create a PLT entry for all PLABELs, because PLABELs with 1321 local symbols may be passed via a pointer to another 1322 object. Additionally, output a dynamic relocation 1323 pointing to the PLT entry. 1324 For executables, the original 32-bit ABI allowed two 1325 different styles of PLABELs (function pointers): For 1326 global functions, the PLABEL word points into the .plt 1327 two bytes past a (function address, gp) pair, and for 1328 local functions the PLABEL points directly at the 1329 function. The magic +2 for the first type allows us to 1330 differentiate between the two. As you can imagine, this 1331 is a real pain when it comes to generating code to call 1332 functions indirectly or to compare function pointers. 1333 We avoid the mess by always pointing a PLABEL into the 1334 .plt, even for local functions. */ 1335 need_entry = PLT_PLABEL | NEED_PLT | NEED_DYNREL; 1336 break; 1337 1338 case R_PARISC_PCREL12F: 1339 hplink->has_12bit_branch = 1; 1340 /* Fall thru. */ 1341 case R_PARISC_PCREL17C: 1342 case R_PARISC_PCREL17F: 1343 hplink->has_17bit_branch = 1; 1344 /* Fall thru. */ 1345 case R_PARISC_PCREL22F: 1346 /* Function calls might need to go through the .plt, and 1347 might require long branch stubs. */ 1348 if (h == NULL) 1349 { 1350 /* We know local syms won't need a .plt entry, and if 1351 they need a long branch stub we can't guarantee that 1352 we can reach the stub. So just flag an error later 1353 if we're doing a shared link and find we need a long 1354 branch stub. */ 1355 continue; 1356 } 1357 else 1358 { 1359 /* Global symbols will need a .plt entry if they remain 1360 global, and in most cases won't need a long branch 1361 stub. Unfortunately, we have to cater for the case 1362 where a symbol is forced local by versioning, or due 1363 to symbolic linking, and we lose the .plt entry. */ 1364 need_entry = NEED_PLT | NEED_STUBREL; 1365 if (h->elf.type == STT_PARISC_MILLI) 1366 need_entry = NEED_STUBREL; 1367 } 1368 break; 1369 1370 case R_PARISC_SEGBASE: /* Used to set segment base. */ 1371 case R_PARISC_SEGREL32: /* Relative reloc, used for unwind. */ 1372 case R_PARISC_PCREL14F: /* PC relative load/store. */ 1373 case R_PARISC_PCREL14R: 1374 case R_PARISC_PCREL17R: /* External branches. */ 1375 case R_PARISC_PCREL21L: /* As above, and for load/store too. */ 1376 /* We don't need to propagate the relocation if linking a 1377 shared object since these are section relative. */ 1378 continue; 1379 1380 case R_PARISC_DPREL14F: /* Used for gp rel data load/store. */ 1381 case R_PARISC_DPREL14R: 1382 case R_PARISC_DPREL21L: 1383 if (info->shared) 1384 { 1385 (*_bfd_error_handler) 1386 (_("%s: relocation %s can not be used when making a shared object; recompile with -fPIC"), 1387 bfd_get_filename (abfd), 1388 elf_hppa_howto_table[r_type].name); 1389 bfd_set_error (bfd_error_bad_value); 1390 return false; 1391 } 1392 /* Fall through. */ 1393 1394 case R_PARISC_DIR17F: /* Used for external branches. */ 1395 case R_PARISC_DIR17R: 1396 case R_PARISC_DIR14F: /* Used for load/store from absolute locn. */ 1397 case R_PARISC_DIR14R: 1398 case R_PARISC_DIR21L: /* As above, and for ext branches too. */ 1399 #if 1 1400 /* Help debug shared library creation. Any of the above 1401 relocs can be used in shared libs, but they may cause 1402 pages to become unshared. */ 1403 if (info->shared) 1404 { 1405 (*_bfd_error_handler) 1406 (_("%s: relocation %s should not be used when making a shared object; recompile with -fPIC"), 1407 bfd_get_filename (abfd), 1408 elf_hppa_howto_table[r_type].name); 1409 } 1410 /* Fall through. */ 1411 #endif 1412 1413 case R_PARISC_DIR32: /* .word relocs. */ 1414 /* We may want to output a dynamic relocation later. */ 1415 need_entry = NEED_DYNREL; 1416 break; 1417 1418 /* This relocation describes the C++ object vtable hierarchy. 1419 Reconstruct it for later use during GC. */ 1420 case R_PARISC_GNU_VTINHERIT: 1421 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, 1422 &h->elf, rel->r_offset)) 1423 return false; 1424 continue; 1425 1426 /* This relocation describes which C++ vtable entries are actually 1427 used. Record for later use during GC. */ 1428 case R_PARISC_GNU_VTENTRY: 1429 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, 1430 &h->elf, rel->r_addend)) 1431 return false; 1432 continue; 1433 1434 default: 1435 continue; 1436 } 1437 1438 /* Now carry out our orders. */ 1439 if (need_entry & NEED_GOT) 1440 { 1441 /* Allocate space for a GOT entry, as well as a dynamic 1442 relocation for this entry. */ 1443 if (dynobj == NULL) 1444 hplink->root.dynobj = dynobj = abfd; 1445 1446 if (hplink->sgot == NULL) 1447 { 1448 if (! elf32_hppa_create_dynamic_sections (dynobj, info)) 1449 return false; 1450 } 1451 1452 if (h != NULL) 1453 { 1454 if (h->elf.got.refcount == -1) 1455 { 1456 h->elf.got.refcount = 1; 1457 1458 /* Make sure this symbol is output as a dynamic symbol. */ 1459 if (h->elf.dynindx == -1) 1460 { 1461 if (! bfd_elf32_link_record_dynamic_symbol (info, 1462 &h->elf)) 1463 return false; 1464 } 1465 } 1466 else 1467 h->elf.got.refcount += 1; 1468 } 1469 else 1470 { 1471 /* This is a global offset table entry for a local symbol. */ 1472 if (local_got_refcounts == NULL) 1473 { 1474 size_t size; 1475 1476 /* Allocate space for local got offsets and local 1477 plt offsets. Done this way to save polluting 1478 elf_obj_tdata with another target specific 1479 pointer. */ 1480 size = symtab_hdr->sh_info * 2 * sizeof (bfd_signed_vma); 1481 local_got_refcounts = ((bfd_signed_vma *) 1482 bfd_alloc (abfd, size)); 1483 if (local_got_refcounts == NULL) 1484 return false; 1485 elf_local_got_refcounts (abfd) = local_got_refcounts; 1486 memset (local_got_refcounts, -1, size); 1487 } 1488 if (local_got_refcounts[r_symndx] == -1) 1489 local_got_refcounts[r_symndx] = 1; 1490 else 1491 local_got_refcounts[r_symndx] += 1; 1492 } 1493 } 1494 1495 if (need_entry & NEED_PLT) 1496 { 1497 /* If we are creating a shared library, and this is a reloc 1498 against a weak symbol or a global symbol in a dynamic 1499 object, then we will be creating an import stub and a 1500 .plt entry for the symbol. Similarly, on a normal link 1501 to symbols defined in a dynamic object we'll need the 1502 import stub and a .plt entry. We don't know yet whether 1503 the symbol is defined or not, so make an entry anyway and 1504 clean up later in adjust_dynamic_symbol. */ 1505 if ((sec->flags & SEC_ALLOC) != 0) 1506 { 1507 if (h != NULL) 1508 { 1509 if (h->elf.plt.refcount == -1) 1510 { 1511 h->elf.plt.refcount = 1; 1512 h->elf.elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; 1513 } 1514 else 1515 h->elf.plt.refcount += 1; 1516 1517 /* If this .plt entry is for a plabel, mark it so 1518 that adjust_dynamic_symbol will keep the entry 1519 even if it appears to be local. */ 1520 if (need_entry & PLT_PLABEL) 1521 h->plabel = 1; 1522 } 1523 else if (need_entry & PLT_PLABEL) 1524 { 1525 int indx; 1526 1527 if (local_got_refcounts == NULL) 1528 { 1529 size_t size; 1530 1531 /* Allocate space for local got offsets and local 1532 plt offsets. */ 1533 size = symtab_hdr->sh_info * 2 * sizeof (bfd_signed_vma); 1534 local_got_refcounts = ((bfd_signed_vma *) 1535 bfd_alloc (abfd, size)); 1536 if (local_got_refcounts == NULL) 1537 return false; 1538 elf_local_got_refcounts (abfd) = local_got_refcounts; 1539 memset (local_got_refcounts, -1, size); 1540 } 1541 indx = r_symndx + symtab_hdr->sh_info; 1542 if (local_got_refcounts[indx] == -1) 1543 local_got_refcounts[indx] = 1; 1544 else 1545 local_got_refcounts[indx] += 1; 1546 } 1547 } 1548 } 1549 1550 if (need_entry & (NEED_DYNREL | NEED_STUBREL)) 1551 { 1552 /* Flag this symbol as having a non-got, non-plt reference 1553 so that we generate copy relocs if it turns out to be 1554 dynamic. */ 1555 if (h != NULL) 1556 h->elf.elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; 1557 1558 /* If we are creating a shared library then we need to copy 1559 the reloc into the shared library. However, if we are 1560 linking with -Bsymbolic, we need only copy absolute 1561 relocs or relocs against symbols that are not defined in 1562 an object we are including in the link. PC- or DP- or 1563 DLT-relative relocs against any local sym or global sym 1564 with DEF_REGULAR set, can be discarded. At this point we 1565 have not seen all the input files, so it is possible that 1566 DEF_REGULAR is not set now but will be set later (it is 1567 never cleared). We account for that possibility below by 1568 storing information in the reloc_entries field of the 1569 hash table entry. 1570 1571 A similar situation to the -Bsymbolic case occurs when 1572 creating shared libraries and symbol visibility changes 1573 render the symbol local. 1574 1575 As it turns out, all the relocs we will be creating here 1576 are absolute, so we cannot remove them on -Bsymbolic 1577 links or visibility changes anyway. A STUB_REL reloc 1578 is absolute too, as in that case it is the reloc in the 1579 stub we will be creating, rather than copying the PCREL 1580 reloc in the branch. */ 1581 if ((sec->flags & SEC_ALLOC) != 0 1582 && info->shared 1583 #if RELATIVE_DYNAMIC_RELOCS 1584 && (!info->symbolic 1585 || is_absolute_reloc (r_type) 1586 || (h != NULL 1587 && ((h->elf.elf_link_hash_flags 1588 & ELF_LINK_HASH_DEF_REGULAR) == 0))) 1589 #endif 1590 ) 1591 { 1592 boolean doit; 1593 asection *srel; 1594 1595 srel = sreloc; 1596 if ((need_entry & NEED_STUBREL)) 1597 srel = stubreloc; 1598 1599 /* Create a reloc section in dynobj and make room for 1600 this reloc. */ 1601 if (srel == NULL) 1602 { 1603 char *name; 1604 1605 if (dynobj == NULL) 1606 hplink->root.dynobj = dynobj = abfd; 1607 1608 name = bfd_elf_string_from_elf_section 1609 (abfd, 1610 elf_elfheader (abfd)->e_shstrndx, 1611 elf_section_data (sec)->rel_hdr.sh_name); 1612 if (name == NULL) 1613 { 1614 (*_bfd_error_handler) 1615 (_("Could not find relocation section for %s"), 1616 sec->name); 1617 bfd_set_error (bfd_error_bad_value); 1618 return false; 1619 } 1620 1621 if ((need_entry & NEED_STUBREL)) 1622 { 1623 size_t len = strlen (name) + sizeof (STUB_SUFFIX); 1624 char *newname = bfd_malloc (len); 1625 1626 if (newname == NULL) 1627 return false; 1628 strcpy (newname, name); 1629 strcpy (newname + len - sizeof (STUB_SUFFIX), 1630 STUB_SUFFIX); 1631 name = newname; 1632 } 1633 1634 srel = bfd_get_section_by_name (dynobj, name); 1635 if (srel == NULL) 1636 { 1637 flagword flags; 1638 1639 srel = bfd_make_section (dynobj, name); 1640 flags = (SEC_HAS_CONTENTS | SEC_READONLY 1641 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 1642 if ((sec->flags & SEC_ALLOC) != 0) 1643 flags |= SEC_ALLOC | SEC_LOAD; 1644 if (srel == NULL 1645 || !bfd_set_section_flags (dynobj, srel, flags) 1646 || !bfd_set_section_alignment (dynobj, srel, 2)) 1647 return false; 1648 } 1649 else if ((need_entry & NEED_STUBREL)) 1650 free (name); 1651 1652 if ((need_entry & NEED_STUBREL)) 1653 stubreloc = srel; 1654 else 1655 sreloc = srel; 1656 } 1657 1658 #if ! LONG_BRANCH_PIC_IN_SHLIB 1659 /* If this is a function call, we only need one dynamic 1660 reloc for the stub as all calls to a particular 1661 function will go through the same stub. Actually, a 1662 long branch stub needs two relocations, but we count 1663 on some intelligence on the part of the dynamic 1664 linker. */ 1665 if ((need_entry & NEED_STUBREL)) 1666 { 1667 doit = h->stub_reloc_sec != stubreloc; 1668 h->stub_reloc_sec = stubreloc; 1669 } 1670 else 1671 #endif 1672 doit = 1; 1673 1674 if (doit) 1675 { 1676 srel->_raw_size += sizeof (Elf32_External_Rela); 1677 1678 #if ! LONG_BRANCH_PIC_IN_SHLIB || RELATIVE_DYNAMIC_RELOCS 1679 /* Keep track of relocations we have entered for 1680 this global symbol, so that we can discard them 1681 later if necessary. */ 1682 if (h != NULL 1683 && (0 1684 #if RELATIVE_DYNAMIC_RELOCS 1685 || ! is_absolute_reloc (rtype) 1686 #endif 1687 || (need_entry & NEED_STUBREL))) 1688 { 1689 struct elf32_hppa_dyn_reloc_entry *p; 1690 1691 for (p = h->reloc_entries; p != NULL; p = p->next) 1692 if (p->section == srel) 1693 break; 1694 1695 if (p == NULL) 1696 { 1697 p = ((struct elf32_hppa_dyn_reloc_entry *) 1698 bfd_alloc (dynobj, sizeof *p)); 1699 if (p == NULL) 1700 return false; 1701 p->next = h->reloc_entries; 1702 h->reloc_entries = p; 1703 p->section = srel; 1704 p->count = 0; 1705 } 1706 1707 /* NEED_STUBREL and NEED_DYNREL are never both 1708 set. Leave the count at zero for the 1709 NEED_STUBREL case as we only ever have one 1710 stub reloc per section per symbol, and this 1711 simplifies code in hppa_discard_copies. */ 1712 if (! (need_entry & NEED_STUBREL)) 1713 ++p->count; 1714 } 1715 #endif 1716 } 1717 } 1718 } 1719 } 1720 1721 return true; 1722 } 1723 1724 /* Return the section that should be marked against garbage collection 1725 for a given relocation. */ 1726 1727 static asection * 1728 elf32_hppa_gc_mark_hook (abfd, info, rel, h, sym) 1729 bfd *abfd; 1730 struct bfd_link_info *info ATTRIBUTE_UNUSED; 1731 Elf_Internal_Rela *rel; 1732 struct elf_link_hash_entry *h; 1733 Elf_Internal_Sym *sym; 1734 { 1735 if (h != NULL) 1736 { 1737 switch ((unsigned int) ELF32_R_TYPE (rel->r_info)) 1738 { 1739 case R_PARISC_GNU_VTINHERIT: 1740 case R_PARISC_GNU_VTENTRY: 1741 break; 1742 1743 default: 1744 switch (h->root.type) 1745 { 1746 case bfd_link_hash_defined: 1747 case bfd_link_hash_defweak: 1748 return h->root.u.def.section; 1749 1750 case bfd_link_hash_common: 1751 return h->root.u.c.p->section; 1752 1753 default: 1754 break; 1755 } 1756 } 1757 } 1758 else 1759 { 1760 if (!(elf_bad_symtab (abfd) 1761 && ELF_ST_BIND (sym->st_info) != STB_LOCAL) 1762 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) 1763 && sym->st_shndx != SHN_COMMON)) 1764 { 1765 return bfd_section_from_elf_index (abfd, sym->st_shndx); 1766 } 1767 } 1768 1769 return NULL; 1770 } 1771 1772 /* Update the got and plt entry reference counts for the section being 1773 removed. */ 1774 1775 static boolean 1776 elf32_hppa_gc_sweep_hook (abfd, info, sec, relocs) 1777 bfd *abfd; 1778 struct bfd_link_info *info ATTRIBUTE_UNUSED; 1779 asection *sec; 1780 const Elf_Internal_Rela *relocs; 1781 { 1782 Elf_Internal_Shdr *symtab_hdr; 1783 struct elf_link_hash_entry **sym_hashes; 1784 bfd_signed_vma *local_got_refcounts; 1785 bfd_signed_vma *local_plt_refcounts; 1786 const Elf_Internal_Rela *rel, *relend; 1787 unsigned long r_symndx; 1788 struct elf_link_hash_entry *h; 1789 struct elf32_hppa_link_hash_table *hplink; 1790 bfd *dynobj; 1791 1792 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1793 sym_hashes = elf_sym_hashes (abfd); 1794 local_got_refcounts = elf_local_got_refcounts (abfd); 1795 local_plt_refcounts = local_got_refcounts; 1796 if (local_plt_refcounts != NULL) 1797 local_plt_refcounts += symtab_hdr->sh_info; 1798 hplink = hppa_link_hash_table (info); 1799 dynobj = hplink->root.dynobj; 1800 if (dynobj == NULL) 1801 return true; 1802 1803 relend = relocs + sec->reloc_count; 1804 for (rel = relocs; rel < relend; rel++) 1805 switch ((unsigned int) ELF32_R_TYPE (rel->r_info)) 1806 { 1807 case R_PARISC_DLTIND14F: 1808 case R_PARISC_DLTIND14R: 1809 case R_PARISC_DLTIND21L: 1810 r_symndx = ELF32_R_SYM (rel->r_info); 1811 if (r_symndx >= symtab_hdr->sh_info) 1812 { 1813 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1814 if (h->got.refcount > 0) 1815 h->got.refcount -= 1; 1816 } 1817 else if (local_got_refcounts != NULL) 1818 { 1819 if (local_got_refcounts[r_symndx] > 0) 1820 local_got_refcounts[r_symndx] -= 1; 1821 } 1822 break; 1823 1824 case R_PARISC_PCREL12F: 1825 case R_PARISC_PCREL17C: 1826 case R_PARISC_PCREL17F: 1827 case R_PARISC_PCREL22F: 1828 r_symndx = ELF32_R_SYM (rel->r_info); 1829 if (r_symndx >= symtab_hdr->sh_info) 1830 { 1831 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1832 if (h->plt.refcount > 0) 1833 h->plt.refcount -= 1; 1834 } 1835 break; 1836 1837 case R_PARISC_PLABEL14R: 1838 case R_PARISC_PLABEL21L: 1839 case R_PARISC_PLABEL32: 1840 r_symndx = ELF32_R_SYM (rel->r_info); 1841 if (r_symndx >= symtab_hdr->sh_info) 1842 { 1843 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1844 if (h->plt.refcount > 0) 1845 h->plt.refcount -= 1; 1846 } 1847 else if (local_plt_refcounts != NULL) 1848 { 1849 if (local_plt_refcounts[r_symndx] > 0) 1850 local_plt_refcounts[r_symndx] -= 1; 1851 } 1852 break; 1853 1854 default: 1855 break; 1856 } 1857 1858 return true; 1859 } 1860 1861 /* Our own version of hide_symbol, so that we can keep plt entries for 1862 plabels. */ 1863 1864 static void 1865 elf32_hppa_hide_symbol (info, h) 1866 struct bfd_link_info *info ATTRIBUTE_UNUSED; 1867 struct elf_link_hash_entry *h; 1868 { 1869 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0) 1870 h->dynindx = -1; 1871 if (! ((struct elf32_hppa_link_hash_entry *) h)->plabel) 1872 { 1873 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; 1874 h->plt.offset = (bfd_vma) -1; 1875 } 1876 } 1877 1878 /* This is the condition under which elf32_hppa_finish_dynamic_symbol 1879 will be called from elflink.h. If elflink.h doesn't call our 1880 finish_dynamic_symbol routine, we'll need to do something about 1881 initializing any .plt and .got entries in elf32_hppa_relocate_section. */ 1882 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \ 1883 ((DYN) \ 1884 && ((INFO)->shared \ 1885 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \ 1886 && ((H)->dynindx != -1 \ 1887 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)) 1888 1889 /* Adjust a symbol defined by a dynamic object and referenced by a 1890 regular object. The current definition is in some section of the 1891 dynamic object, but we're not including those sections. We have to 1892 change the definition to something the rest of the link can 1893 understand. */ 1894 1895 static boolean 1896 elf32_hppa_adjust_dynamic_symbol (info, h) 1897 struct bfd_link_info *info; 1898 struct elf_link_hash_entry *h; 1899 { 1900 bfd *dynobj; 1901 struct elf32_hppa_link_hash_table *hplink; 1902 asection *s; 1903 1904 hplink = hppa_link_hash_table (info); 1905 dynobj = hplink->root.dynobj; 1906 1907 /* If this is a function, put it in the procedure linkage table. We 1908 will fill in the contents of the procedure linkage table later, 1909 when we know the address of the .got section. */ 1910 if (h->type == STT_FUNC 1911 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) 1912 { 1913 if (!info->shared 1914 && h->plt.refcount > 0 1915 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 1916 && (h->root.u.def.section->flags & SEC_HAS_GOT_REF) != 0) 1917 { 1918 ((struct elf32_hppa_link_hash_entry *) h)->maybe_pic_call = 1; 1919 } 1920 1921 if (h->plt.refcount <= 0 1922 || ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 1923 && h->root.type != bfd_link_hash_defweak 1924 && ! ((struct elf32_hppa_link_hash_entry *) h)->plabel 1925 && (!info->shared || info->symbolic))) 1926 { 1927 /* The .plt entry is not needed when: 1928 a) Garbage collection has removed all references to the 1929 symbol, or 1930 b) We know for certain the symbol is defined in this 1931 object, and it's not a weak definition, nor is the symbol 1932 used by a plabel relocation. Either this object is the 1933 application or we are doing a shared symbolic link. */ 1934 1935 /* As a special sop to the hppa ABI, we keep a .plt entry 1936 for functions in sections containing PIC code. */ 1937 if (((struct elf32_hppa_link_hash_entry *) h)->maybe_pic_call) 1938 ((struct elf32_hppa_link_hash_entry *) h)->pic_call = 1; 1939 else 1940 { 1941 h->plt.offset = (bfd_vma) -1; 1942 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; 1943 return true; 1944 } 1945 } 1946 1947 if (! ((struct elf32_hppa_link_hash_entry *) h)->pic_call) 1948 { 1949 /* Make sure this symbol is output as a dynamic symbol. */ 1950 if (h->dynindx == -1 1951 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) 1952 { 1953 if (! bfd_elf32_link_record_dynamic_symbol (info, h)) 1954 return false; 1955 } 1956 } 1957 1958 return true; 1959 } 1960 1961 /* If this is a weak symbol, and there is a real definition, the 1962 processor independent code will have arranged for us to see the 1963 real definition first, and we can just use the same value. */ 1964 if (h->weakdef != NULL) 1965 { 1966 if (h->weakdef->root.type != bfd_link_hash_defined 1967 && h->weakdef->root.type != bfd_link_hash_defweak) 1968 abort (); 1969 h->root.u.def.section = h->weakdef->root.u.def.section; 1970 h->root.u.def.value = h->weakdef->root.u.def.value; 1971 return true; 1972 } 1973 1974 /* This is a reference to a symbol defined by a dynamic object which 1975 is not a function. */ 1976 1977 /* If we are creating a shared library, we must presume that the 1978 only references to the symbol are via the global offset table. 1979 For such cases we need not do anything here; the relocations will 1980 be handled correctly by relocate_section. */ 1981 if (info->shared) 1982 return true; 1983 1984 /* If there are no references to this symbol that do not use the 1985 GOT, we don't need to generate a copy reloc. */ 1986 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) 1987 return true; 1988 1989 /* We must allocate the symbol in our .dynbss section, which will 1990 become part of the .bss section of the executable. There will be 1991 an entry for this symbol in the .dynsym section. The dynamic 1992 object will contain position independent code, so all references 1993 from the dynamic object to this symbol will go through the global 1994 offset table. The dynamic linker will use the .dynsym entry to 1995 determine the address it must put in the global offset table, so 1996 both the dynamic object and the regular object will refer to the 1997 same memory location for the variable. */ 1998 1999 s = hplink->sdynbss; 2000 2001 /* We must generate a COPY reloc to tell the dynamic linker to 2002 copy the initial value out of the dynamic object and into the 2003 runtime process image. We need to remember the offset into the 2004 .rela.bss section we are going to use. */ 2005 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 2006 { 2007 asection *srel; 2008 2009 srel = hplink->srelbss; 2010 srel->_raw_size += sizeof (Elf32_External_Rela); 2011 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; 2012 } 2013 2014 { 2015 /* We need to figure out the alignment required for this symbol. I 2016 have no idea how other ELF linkers handle this. */ 2017 unsigned int power_of_two; 2018 2019 power_of_two = bfd_log2 (h->size); 2020 if (power_of_two > 3) 2021 power_of_two = 3; 2022 2023 /* Apply the required alignment. */ 2024 s->_raw_size = BFD_ALIGN (s->_raw_size, 2025 (bfd_size_type) (1 << power_of_two)); 2026 if (power_of_two > bfd_get_section_alignment (dynobj, s)) 2027 { 2028 if (! bfd_set_section_alignment (dynobj, s, power_of_two)) 2029 return false; 2030 } 2031 } 2032 /* Define the symbol as being at this point in the section. */ 2033 h->root.u.def.section = s; 2034 h->root.u.def.value = s->_raw_size; 2035 2036 /* Increment the section size to make room for the symbol. */ 2037 s->_raw_size += h->size; 2038 2039 return true; 2040 } 2041 2042 /* Called via elf_link_hash_traverse to create .plt entries for an 2043 application that uses statically linked PIC functions. Similar to 2044 the first part of elf32_hppa_adjust_dynamic_symbol. */ 2045 2046 static boolean 2047 hppa_handle_PIC_calls (h, inf) 2048 struct elf_link_hash_entry *h; 2049 PTR inf ATTRIBUTE_UNUSED; 2050 { 2051 if (! (h->plt.refcount > 0 2052 && (h->root.type == bfd_link_hash_defined 2053 || h->root.type == bfd_link_hash_defweak) 2054 && (h->root.u.def.section->flags & SEC_HAS_GOT_REF) != 0)) 2055 { 2056 h->plt.offset = (bfd_vma) -1; 2057 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; 2058 return true; 2059 } 2060 2061 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; 2062 ((struct elf32_hppa_link_hash_entry *) h)->maybe_pic_call = 1; 2063 ((struct elf32_hppa_link_hash_entry *) h)->pic_call = 1; 2064 2065 return true; 2066 } 2067 2068 /* Allocate space in .plt, .got and associated reloc sections for 2069 global syms. */ 2070 2071 static boolean 2072 allocate_plt_and_got (h, inf) 2073 struct elf_link_hash_entry *h; 2074 PTR inf; 2075 { 2076 struct bfd_link_info *info; 2077 struct elf32_hppa_link_hash_table *hplink; 2078 asection *s; 2079 2080 if (h->root.type == bfd_link_hash_indirect 2081 || h->root.type == bfd_link_hash_warning) 2082 return true; 2083 2084 info = (struct bfd_link_info *) inf; 2085 hplink = hppa_link_hash_table (info); 2086 if ((hplink->root.dynamic_sections_created 2087 && h->plt.refcount > 0) 2088 || ((struct elf32_hppa_link_hash_entry *) h)->pic_call) 2089 { 2090 /* Make an entry in the .plt section. */ 2091 s = hplink->splt; 2092 h->plt.offset = s->_raw_size; 2093 if (PLABEL_PLT_ENTRY_SIZE != PLT_ENTRY_SIZE 2094 && ((struct elf32_hppa_link_hash_entry *) h)->plabel 2095 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) 2096 { 2097 /* Add some extra space for the dynamic linker to use. */ 2098 s->_raw_size += PLABEL_PLT_ENTRY_SIZE; 2099 } 2100 else 2101 s->_raw_size += PLT_ENTRY_SIZE; 2102 2103 if (! ((struct elf32_hppa_link_hash_entry *) h)->pic_call 2104 && WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h)) 2105 { 2106 /* We also need to make an entry in the .rela.plt section. */ 2107 hplink->srelplt->_raw_size += sizeof (Elf32_External_Rela); 2108 hplink->need_plt_stub = 1; 2109 } 2110 } 2111 else 2112 { 2113 h->plt.offset = (bfd_vma) -1; 2114 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; 2115 } 2116 2117 if (h->got.refcount > 0) 2118 { 2119 boolean dyn; 2120 2121 s = hplink->sgot; 2122 h->got.offset = s->_raw_size; 2123 s->_raw_size += GOT_ENTRY_SIZE; 2124 dyn = hplink->root.dynamic_sections_created; 2125 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)) 2126 hplink->srelgot->_raw_size += sizeof (Elf32_External_Rela); 2127 } 2128 else 2129 h->got.offset = (bfd_vma) -1; 2130 2131 return true; 2132 } 2133 2134 #if ((! LONG_BRANCH_PIC_IN_SHLIB && LONG_BRANCH_VIA_PLT) \ 2135 || RELATIVE_DYNAMIC_RELOCS) 2136 /* This function is called via elf_link_hash_traverse to discard space 2137 we allocated for relocs that it turned out we didn't need. */ 2138 2139 static boolean 2140 hppa_discard_copies (h, inf) 2141 struct elf_link_hash_entry *h; 2142 PTR inf; 2143 { 2144 struct elf32_hppa_dyn_reloc_entry *s; 2145 struct elf32_hppa_link_hash_entry *eh; 2146 struct bfd_link_info *info; 2147 2148 eh = (struct elf32_hppa_link_hash_entry *) h; 2149 info = (struct bfd_link_info *) inf; 2150 2151 #if ! LONG_BRANCH_PIC_IN_SHLIB && LONG_BRANCH_VIA_PLT 2152 /* Handle the stub reloc case. If we have a plt entry for the 2153 function, we won't be needing long branch stubs. s->count will 2154 only be zero for stub relocs, which provides a handy way of 2155 flagging these relocs, and means we need do nothing special for 2156 the forced local and symbolic link case. */ 2157 if (eh->stub_reloc_sec != NULL 2158 && eh->elf.plt.offset != (bfd_vma) -1) 2159 { 2160 for (s = eh->reloc_entries; s != NULL; s = s->next) 2161 if (s->count == 0) 2162 s->section->_raw_size -= sizeof (Elf32_External_Rela); 2163 } 2164 #endif 2165 2166 #if RELATIVE_DYNAMIC_RELOCS 2167 /* If a symbol has been forced local or we have found a regular 2168 definition for the symbolic link case, then we won't be needing 2169 any relocs. */ 2170 if (eh->elf.dynindx == -1 2171 || ((eh->elf.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 2172 && !is_absolute_reloc (r_type) 2173 && info->symbolic)) 2174 { 2175 for (s = eh->reloc_entries; s != NULL; s = s->next) 2176 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela); 2177 } 2178 #endif 2179 2180 return true; 2181 } 2182 #endif 2183 2184 /* This function is called via elf_link_hash_traverse to force 2185 millicode symbols local so they do not end up as globals in the 2186 dynamic symbol table. We ought to be able to do this in 2187 adjust_dynamic_symbol, but our adjust_dynamic_symbol is not called 2188 for all dynamic symbols. Arguably, this is a bug in 2189 elf_adjust_dynamic_symbol. */ 2190 2191 static boolean 2192 clobber_millicode_symbols (h, info) 2193 struct elf_link_hash_entry *h; 2194 struct bfd_link_info *info; 2195 { 2196 /* We only want to remove these from the dynamic symbol table. 2197 Therefore we do not leave ELF_LINK_FORCED_LOCAL set. */ 2198 if (h->type == STT_PARISC_MILLI) 2199 { 2200 unsigned short oldflags = h->elf_link_hash_flags; 2201 h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL; 2202 elf32_hppa_hide_symbol (info, h); 2203 h->elf_link_hash_flags &= ~ELF_LINK_FORCED_LOCAL; 2204 h->elf_link_hash_flags |= oldflags & ELF_LINK_FORCED_LOCAL; 2205 } 2206 return true; 2207 } 2208 2209 /* Set the sizes of the dynamic sections. */ 2210 2211 static boolean 2212 elf32_hppa_size_dynamic_sections (output_bfd, info) 2213 bfd *output_bfd; 2214 struct bfd_link_info *info; 2215 { 2216 struct elf32_hppa_link_hash_table *hplink; 2217 bfd *dynobj; 2218 asection *s; 2219 boolean relocs; 2220 boolean reltext; 2221 2222 hplink = hppa_link_hash_table (info); 2223 dynobj = hplink->root.dynobj; 2224 if (dynobj == NULL) 2225 abort (); 2226 2227 if (hplink->root.dynamic_sections_created) 2228 { 2229 bfd *i; 2230 2231 /* Set the contents of the .interp section to the interpreter. */ 2232 if (! info->shared) 2233 { 2234 s = bfd_get_section_by_name (dynobj, ".interp"); 2235 if (s == NULL) 2236 abort (); 2237 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; 2238 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2239 } 2240 2241 /* Force millicode symbols local. */ 2242 elf_link_hash_traverse (&hplink->root, 2243 clobber_millicode_symbols, 2244 info); 2245 2246 /* Set up .got and .plt offsets for local syms. */ 2247 for (i = info->input_bfds; i; i = i->link_next) 2248 { 2249 bfd_signed_vma *local_got; 2250 bfd_signed_vma *end_local_got; 2251 bfd_signed_vma *local_plt; 2252 bfd_signed_vma *end_local_plt; 2253 bfd_size_type locsymcount; 2254 Elf_Internal_Shdr *symtab_hdr; 2255 asection *srel; 2256 2257 if (bfd_get_flavour (i) != bfd_target_elf_flavour) 2258 continue; 2259 2260 local_got = elf_local_got_refcounts (i); 2261 if (!local_got) 2262 continue; 2263 2264 symtab_hdr = &elf_tdata (i)->symtab_hdr; 2265 locsymcount = symtab_hdr->sh_info; 2266 end_local_got = local_got + locsymcount; 2267 s = hplink->sgot; 2268 srel = hplink->srelgot; 2269 for (; local_got < end_local_got; ++local_got) 2270 { 2271 if (*local_got > 0) 2272 { 2273 *local_got = s->_raw_size; 2274 s->_raw_size += GOT_ENTRY_SIZE; 2275 if (info->shared) 2276 srel->_raw_size += sizeof (Elf32_External_Rela); 2277 } 2278 else 2279 *local_got = (bfd_vma) -1; 2280 } 2281 2282 local_plt = end_local_got; 2283 end_local_plt = local_plt + locsymcount; 2284 s = hplink->splt; 2285 srel = hplink->srelplt; 2286 for (; local_plt < end_local_plt; ++local_plt) 2287 { 2288 if (*local_plt > 0) 2289 { 2290 *local_plt = s->_raw_size; 2291 s->_raw_size += PLT_ENTRY_SIZE; 2292 if (info->shared) 2293 srel->_raw_size += sizeof (Elf32_External_Rela); 2294 } 2295 else 2296 *local_plt = (bfd_vma) -1; 2297 } 2298 } 2299 } 2300 else 2301 { 2302 /* Run through the function symbols, looking for any that are 2303 PIC, and allocate space for the necessary .plt entries so 2304 that %r19 will be set up. */ 2305 if (! info->shared) 2306 elf_link_hash_traverse (&hplink->root, 2307 hppa_handle_PIC_calls, 2308 info); 2309 } 2310 2311 /* Allocate global sym .plt and .got entries. */ 2312 elf_link_hash_traverse (&hplink->root, 2313 allocate_plt_and_got, 2314 info); 2315 2316 #if ((! LONG_BRANCH_PIC_IN_SHLIB && LONG_BRANCH_VIA_PLT) \ 2317 || RELATIVE_DYNAMIC_RELOCS) 2318 /* If this is a -Bsymbolic shared link, then we need to discard all 2319 relocs against symbols defined in a regular object. We also need 2320 to lose relocs we've allocated for long branch stubs if we know 2321 we won't be generating a stub. */ 2322 if (info->shared) 2323 elf_link_hash_traverse (&hplink->root, 2324 hppa_discard_copies, 2325 info); 2326 #endif 2327 2328 /* The check_relocs and adjust_dynamic_symbol entry points have 2329 determined the sizes of the various dynamic sections. Allocate 2330 memory for them. */ 2331 relocs = false; 2332 reltext = false; 2333 for (s = dynobj->sections; s != NULL; s = s->next) 2334 { 2335 const char *name; 2336 2337 if ((s->flags & SEC_LINKER_CREATED) == 0) 2338 continue; 2339 2340 /* It's OK to base decisions on the section name, because none 2341 of the dynobj section names depend upon the input files. */ 2342 name = bfd_get_section_name (dynobj, s); 2343 2344 if (strncmp (name, ".rela", 5) == 0) 2345 { 2346 if (s->_raw_size != 0) 2347 { 2348 asection *target; 2349 const char *outname; 2350 2351 /* Remember whether there are any reloc sections other 2352 than .rela.plt. */ 2353 if (strcmp (name+5, ".plt") != 0) 2354 relocs = true; 2355 2356 /* If this relocation section applies to a read only 2357 section, then we probably need a DT_TEXTREL entry. */ 2358 outname = bfd_get_section_name (output_bfd, 2359 s->output_section); 2360 target = bfd_get_section_by_name (output_bfd, outname + 5); 2361 if (target != NULL 2362 && (target->flags & SEC_READONLY) != 0 2363 && (target->flags & SEC_ALLOC) != 0) 2364 reltext = true; 2365 2366 /* We use the reloc_count field as a counter if we need 2367 to copy relocs into the output file. */ 2368 s->reloc_count = 0; 2369 } 2370 } 2371 else if (strcmp (name, ".plt") == 0) 2372 { 2373 if (hplink->need_plt_stub) 2374 { 2375 /* Make space for the plt stub at the end of the .plt 2376 section. We want this stub right at the end, up 2377 against the .got section. */ 2378 int gotalign = bfd_section_alignment (dynobj, hplink->sgot); 2379 int pltalign = bfd_section_alignment (dynobj, s); 2380 bfd_size_type mask; 2381 2382 if (gotalign > pltalign) 2383 bfd_set_section_alignment (dynobj, s, gotalign); 2384 mask = ((bfd_size_type) 1 << gotalign) - 1; 2385 s->_raw_size = (s->_raw_size + sizeof (plt_stub) + mask) & ~mask; 2386 } 2387 } 2388 else if (strcmp (name, ".got") == 0) 2389 ; 2390 else 2391 { 2392 /* It's not one of our sections, so don't allocate space. */ 2393 continue; 2394 } 2395 2396 if (s->_raw_size == 0) 2397 { 2398 /* If we don't need this section, strip it from the 2399 output file. This is mostly to handle .rela.bss and 2400 .rela.plt. We must create both sections in 2401 create_dynamic_sections, because they must be created 2402 before the linker maps input sections to output 2403 sections. The linker does that before 2404 adjust_dynamic_symbol is called, and it is that 2405 function which decides whether anything needs to go 2406 into these sections. */ 2407 _bfd_strip_section_from_output (info, s); 2408 continue; 2409 } 2410 2411 /* Allocate memory for the section contents. Zero it, because 2412 we may not fill in all the reloc sections. */ 2413 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); 2414 if (s->contents == NULL && s->_raw_size != 0) 2415 return false; 2416 } 2417 2418 if (hplink->root.dynamic_sections_created) 2419 { 2420 /* Like IA-64 and HPPA64, always create a DT_PLTGOT. It 2421 actually has nothing to do with the PLT, it is how we 2422 communicate the LTP value of a load module to the dynamic 2423 linker. */ 2424 if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)) 2425 return false; 2426 2427 /* Add some entries to the .dynamic section. We fill in the 2428 values later, in elf32_hppa_finish_dynamic_sections, but we 2429 must add the entries now so that we get the correct size for 2430 the .dynamic section. The DT_DEBUG entry is filled in by the 2431 dynamic linker and used by the debugger. */ 2432 if (! info->shared) 2433 { 2434 if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) 2435 return false; 2436 } 2437 2438 if (hplink->srelplt->_raw_size != 0) 2439 { 2440 if (! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) 2441 || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA) 2442 || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) 2443 return false; 2444 } 2445 2446 if (relocs) 2447 { 2448 if (! bfd_elf32_add_dynamic_entry (info, DT_RELA, 0) 2449 || ! bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0) 2450 || ! bfd_elf32_add_dynamic_entry (info, DT_RELAENT, 2451 sizeof (Elf32_External_Rela))) 2452 return false; 2453 } 2454 2455 if (reltext) 2456 { 2457 if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) 2458 return false; 2459 info->flags |= DF_TEXTREL; 2460 } 2461 } 2462 2463 return true; 2464 } 2465 2466 /* External entry points for sizing and building linker stubs. */ 2467 2468 /* Determine and set the size of the stub section for a final link. 2469 2470 The basic idea here is to examine all the relocations looking for 2471 PC-relative calls to a target that is unreachable with a "bl" 2472 instruction. */ 2473 2474 boolean 2475 elf32_hppa_size_stubs (output_bfd, stub_bfd, info, multi_subspace, group_size, 2476 add_stub_section, layout_sections_again) 2477 bfd *output_bfd; 2478 bfd *stub_bfd; 2479 struct bfd_link_info *info; 2480 boolean multi_subspace; 2481 bfd_signed_vma group_size; 2482 asection * (*add_stub_section) PARAMS ((const char *, asection *)); 2483 void (*layout_sections_again) PARAMS ((void)); 2484 { 2485 bfd *input_bfd; 2486 asection *section; 2487 asection **input_list, **list; 2488 Elf_Internal_Sym *local_syms, **all_local_syms; 2489 unsigned int bfd_indx, bfd_count; 2490 int top_id, top_index; 2491 struct elf32_hppa_link_hash_table *hplink; 2492 bfd_size_type stub_group_size; 2493 boolean stubs_always_before_branch; 2494 boolean stub_changed = 0; 2495 boolean ret = 0; 2496 2497 hplink = hppa_link_hash_table (info); 2498 2499 /* Stash our params away. */ 2500 hplink->stub_bfd = stub_bfd; 2501 hplink->multi_subspace = multi_subspace; 2502 hplink->add_stub_section = add_stub_section; 2503 hplink->layout_sections_again = layout_sections_again; 2504 stubs_always_before_branch = group_size < 0; 2505 if (group_size < 0) 2506 stub_group_size = -group_size; 2507 else 2508 stub_group_size = group_size; 2509 if (stub_group_size == 1) 2510 { 2511 /* Default values. */ 2512 stub_group_size = 8000000; 2513 if (hplink->has_17bit_branch || hplink->multi_subspace) 2514 stub_group_size = 250000; 2515 if (hplink->has_12bit_branch) 2516 stub_group_size = 7812; 2517 } 2518 2519 /* Count the number of input BFDs and find the top input section id. */ 2520 for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0; 2521 input_bfd != NULL; 2522 input_bfd = input_bfd->link_next) 2523 { 2524 bfd_count += 1; 2525 for (section = input_bfd->sections; 2526 section != NULL; 2527 section = section->next) 2528 { 2529 if (top_id < section->id) 2530 top_id = section->id; 2531 } 2532 } 2533 2534 hplink->stub_group 2535 = (struct map_stub *) bfd_zmalloc (sizeof (struct map_stub) * (top_id + 1)); 2536 if (hplink->stub_group == NULL) 2537 return false; 2538 2539 /* Make a list of input sections for each output section included in 2540 the link. 2541 2542 We can't use output_bfd->section_count here to find the top output 2543 section index as some sections may have been removed, and 2544 _bfd_strip_section_from_output doesn't renumber the indices. */ 2545 for (section = output_bfd->sections, top_index = 0; 2546 section != NULL; 2547 section = section->next) 2548 { 2549 if (top_index < section->index) 2550 top_index = section->index; 2551 } 2552 2553 input_list 2554 = (asection **) bfd_malloc (sizeof (asection *) * (top_index + 1)); 2555 if (input_list == NULL) 2556 return false; 2557 2558 /* For sections we aren't interested in, mark their entries with a 2559 value we can check later. */ 2560 list = input_list + top_index; 2561 do 2562 *list = bfd_abs_section_ptr; 2563 while (list-- != input_list); 2564 2565 for (section = output_bfd->sections; 2566 section != NULL; 2567 section = section->next) 2568 { 2569 if ((section->flags & SEC_CODE) != 0) 2570 input_list[section->index] = NULL; 2571 } 2572 2573 /* Now actually build the lists. */ 2574 for (input_bfd = info->input_bfds; 2575 input_bfd != NULL; 2576 input_bfd = input_bfd->link_next) 2577 { 2578 for (section = input_bfd->sections; 2579 section != NULL; 2580 section = section->next) 2581 { 2582 if (section->output_section != NULL 2583 && section->output_section->owner == output_bfd 2584 && section->output_section->index <= top_index) 2585 { 2586 list = input_list + section->output_section->index; 2587 if (*list != bfd_abs_section_ptr) 2588 { 2589 /* Steal the link_sec pointer for our list. */ 2590 #define PREV_SEC(sec) (hplink->stub_group[(sec)->id].link_sec) 2591 /* This happens to make the list in reverse order, 2592 which is what we want. */ 2593 PREV_SEC (section) = *list; 2594 *list = section; 2595 } 2596 } 2597 } 2598 } 2599 2600 /* See whether we can group stub sections together. Grouping stub 2601 sections may result in fewer stubs. More importantly, we need to 2602 put all .init* and .fini* stubs at the beginning of the .init or 2603 .fini output sections respectively, because glibc splits the 2604 _init and _fini functions into multiple parts. Putting a stub in 2605 the middle of a function is not a good idea. */ 2606 list = input_list + top_index; 2607 do 2608 { 2609 asection *tail = *list; 2610 if (tail == bfd_abs_section_ptr) 2611 continue; 2612 while (tail != NULL) 2613 { 2614 asection *curr; 2615 asection *prev; 2616 bfd_size_type total; 2617 2618 curr = tail; 2619 if (tail->_cooked_size) 2620 total = tail->_cooked_size; 2621 else 2622 total = tail->_raw_size; 2623 while ((prev = PREV_SEC (curr)) != NULL 2624 && ((total += curr->output_offset - prev->output_offset) 2625 < stub_group_size)) 2626 curr = prev; 2627 2628 /* OK, the size from the start of CURR to the end is less 2629 than 250000 bytes and thus can be handled by one stub 2630 section. (or the tail section is itself larger than 2631 250000 bytes, in which case we may be toast.) 2632 We should really be keeping track of the total size of 2633 stubs added here, as stubs contribute to the final output 2634 section size. That's a little tricky, and this way will 2635 only break if stubs added total more than 12144 bytes, or 2636 1518 long branch stubs. It seems unlikely for more than 2637 1518 different functions to be called, especially from 2638 code only 250000 bytes long. */ 2639 do 2640 { 2641 prev = PREV_SEC (tail); 2642 /* Set up this stub group. */ 2643 hplink->stub_group[tail->id].link_sec = curr; 2644 } 2645 while (tail != curr && (tail = prev) != NULL); 2646 2647 /* But wait, there's more! Input sections up to 250000 2648 bytes before the stub section can be handled by it too. */ 2649 if (!stubs_always_before_branch) 2650 { 2651 total = 0; 2652 while (prev != NULL 2653 && ((total += tail->output_offset - prev->output_offset) 2654 < stub_group_size)) 2655 { 2656 tail = prev; 2657 prev = PREV_SEC (tail); 2658 hplink->stub_group[tail->id].link_sec = curr; 2659 } 2660 } 2661 tail = prev; 2662 } 2663 } 2664 while (list-- != input_list); 2665 free (input_list); 2666 #undef PREV_SEC 2667 2668 /* We want to read in symbol extension records only once. To do this 2669 we need to read in the local symbols in parallel and save them for 2670 later use; so hold pointers to the local symbols in an array. */ 2671 all_local_syms 2672 = (Elf_Internal_Sym **) bfd_zmalloc (sizeof (Elf_Internal_Sym *) 2673 * bfd_count); 2674 if (all_local_syms == NULL) 2675 return false; 2676 2677 /* Walk over all the input BFDs, swapping in local symbols. 2678 If we are creating a shared library, create hash entries for the 2679 export stubs. */ 2680 for (input_bfd = info->input_bfds, bfd_indx = 0; 2681 input_bfd != NULL; 2682 input_bfd = input_bfd->link_next, bfd_indx++) 2683 { 2684 Elf_Internal_Shdr *symtab_hdr; 2685 Elf_Internal_Sym *isym; 2686 Elf32_External_Sym *ext_syms, *esym, *end_sy; 2687 2688 /* We'll need the symbol table in a second. */ 2689 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 2690 if (symtab_hdr->sh_info == 0) 2691 continue; 2692 2693 /* We need an array of the local symbols attached to the input bfd. 2694 Unfortunately, we're going to have to read & swap them in. */ 2695 local_syms = (Elf_Internal_Sym *) 2696 bfd_malloc (symtab_hdr->sh_info * sizeof (Elf_Internal_Sym)); 2697 if (local_syms == NULL) 2698 { 2699 goto error_ret_free_local; 2700 } 2701 all_local_syms[bfd_indx] = local_syms; 2702 ext_syms = (Elf32_External_Sym *) 2703 bfd_malloc (symtab_hdr->sh_info * sizeof (Elf32_External_Sym)); 2704 if (ext_syms == NULL) 2705 { 2706 goto error_ret_free_local; 2707 } 2708 2709 if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0 2710 || (bfd_read (ext_syms, 1, 2711 (symtab_hdr->sh_info * sizeof (Elf32_External_Sym)), 2712 input_bfd) 2713 != (symtab_hdr->sh_info * sizeof (Elf32_External_Sym)))) 2714 { 2715 free (ext_syms); 2716 goto error_ret_free_local; 2717 } 2718 2719 /* Swap the local symbols in. */ 2720 isym = local_syms; 2721 esym = ext_syms; 2722 for (end_sy = esym + symtab_hdr->sh_info; esym < end_sy; esym++, isym++) 2723 bfd_elf32_swap_symbol_in (input_bfd, esym, isym); 2724 2725 /* Now we can free the external symbols. */ 2726 free (ext_syms); 2727 2728 #if ! LONG_BRANCH_PIC_IN_SHLIB 2729 /* If this is a shared link, find all the stub reloc sections. */ 2730 if (info->shared) 2731 for (section = input_bfd->sections; 2732 section != NULL; 2733 section = section->next) 2734 { 2735 char *name; 2736 asection *reloc_sec; 2737 2738 name = bfd_malloc (strlen (section->name) 2739 + sizeof STUB_SUFFIX 2740 + 5); 2741 if (name == NULL) 2742 return false; 2743 sprintf (name, ".rela%s%s", section->name, STUB_SUFFIX); 2744 reloc_sec = bfd_get_section_by_name (hplink->root.dynobj, name); 2745 hplink->stub_group[section->id].reloc_sec = reloc_sec; 2746 free (name); 2747 } 2748 #endif 2749 2750 if (info->shared && hplink->multi_subspace) 2751 { 2752 struct elf_link_hash_entry **sym_hashes; 2753 struct elf_link_hash_entry **end_hashes; 2754 unsigned int symcount; 2755 2756 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) 2757 - symtab_hdr->sh_info); 2758 sym_hashes = elf_sym_hashes (input_bfd); 2759 end_hashes = sym_hashes + symcount; 2760 2761 /* Look through the global syms for functions; We need to 2762 build export stubs for all globally visible functions. */ 2763 for (; sym_hashes < end_hashes; sym_hashes++) 2764 { 2765 struct elf32_hppa_link_hash_entry *hash; 2766 2767 hash = (struct elf32_hppa_link_hash_entry *) *sym_hashes; 2768 2769 while (hash->elf.root.type == bfd_link_hash_indirect 2770 || hash->elf.root.type == bfd_link_hash_warning) 2771 hash = ((struct elf32_hppa_link_hash_entry *) 2772 hash->elf.root.u.i.link); 2773 2774 /* At this point in the link, undefined syms have been 2775 resolved, so we need to check that the symbol was 2776 defined in this BFD. */ 2777 if ((hash->elf.root.type == bfd_link_hash_defined 2778 || hash->elf.root.type == bfd_link_hash_defweak) 2779 && hash->elf.type == STT_FUNC 2780 && hash->elf.root.u.def.section->output_section != NULL 2781 && (hash->elf.root.u.def.section->output_section->owner 2782 == output_bfd) 2783 && hash->elf.root.u.def.section->owner == input_bfd 2784 && (hash->elf.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) 2785 && !(hash->elf.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) 2786 && ELF_ST_VISIBILITY (hash->elf.other) == STV_DEFAULT) 2787 { 2788 asection *sec; 2789 const char *stub_name; 2790 struct elf32_hppa_stub_hash_entry *stub_entry; 2791 2792 sec = hash->elf.root.u.def.section; 2793 stub_name = hash->elf.root.root.string; 2794 stub_entry = hppa_stub_hash_lookup (&hplink->stub_hash_table, 2795 stub_name, 2796 false, false); 2797 if (stub_entry == NULL) 2798 { 2799 stub_entry = hppa_add_stub (stub_name, sec, hplink); 2800 if (!stub_entry) 2801 goto error_ret_free_local; 2802 2803 stub_entry->target_value = hash->elf.root.u.def.value; 2804 stub_entry->target_section = hash->elf.root.u.def.section; 2805 stub_entry->stub_type = hppa_stub_export; 2806 stub_entry->h = hash; 2807 stub_changed = 1; 2808 } 2809 else 2810 { 2811 (*_bfd_error_handler) (_("%s: duplicate export stub %s"), 2812 bfd_get_filename (input_bfd), 2813 stub_name); 2814 } 2815 } 2816 } 2817 } 2818 } 2819 2820 while (1) 2821 { 2822 asection *stub_sec; 2823 2824 for (input_bfd = info->input_bfds, bfd_indx = 0; 2825 input_bfd != NULL; 2826 input_bfd = input_bfd->link_next, bfd_indx++) 2827 { 2828 Elf_Internal_Shdr *symtab_hdr; 2829 2830 /* We'll need the symbol table in a second. */ 2831 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 2832 if (symtab_hdr->sh_info == 0) 2833 continue; 2834 2835 local_syms = all_local_syms[bfd_indx]; 2836 2837 /* Walk over each section attached to the input bfd. */ 2838 for (section = input_bfd->sections; 2839 section != NULL; 2840 section = section->next) 2841 { 2842 Elf_Internal_Shdr *input_rel_hdr; 2843 Elf32_External_Rela *external_relocs, *erelaend, *erela; 2844 Elf_Internal_Rela *internal_relocs, *irelaend, *irela; 2845 2846 /* If there aren't any relocs, then there's nothing more 2847 to do. */ 2848 if ((section->flags & SEC_RELOC) == 0 2849 || section->reloc_count == 0) 2850 continue; 2851 2852 /* If this section is a link-once section that will be 2853 discarded, then don't create any stubs. */ 2854 if (section->output_section == NULL 2855 || section->output_section->owner != output_bfd) 2856 continue; 2857 2858 /* Allocate space for the external relocations. */ 2859 external_relocs 2860 = ((Elf32_External_Rela *) 2861 bfd_malloc (section->reloc_count 2862 * sizeof (Elf32_External_Rela))); 2863 if (external_relocs == NULL) 2864 { 2865 goto error_ret_free_local; 2866 } 2867 2868 /* Likewise for the internal relocations. */ 2869 internal_relocs = ((Elf_Internal_Rela *) 2870 bfd_malloc (section->reloc_count 2871 * sizeof (Elf_Internal_Rela))); 2872 if (internal_relocs == NULL) 2873 { 2874 free (external_relocs); 2875 goto error_ret_free_local; 2876 } 2877 2878 /* Read in the external relocs. */ 2879 input_rel_hdr = &elf_section_data (section)->rel_hdr; 2880 if (bfd_seek (input_bfd, input_rel_hdr->sh_offset, SEEK_SET) != 0 2881 || bfd_read (external_relocs, 1, 2882 input_rel_hdr->sh_size, 2883 input_bfd) != input_rel_hdr->sh_size) 2884 { 2885 free (external_relocs); 2886 error_ret_free_internal: 2887 free (internal_relocs); 2888 goto error_ret_free_local; 2889 } 2890 2891 /* Swap in the relocs. */ 2892 erela = external_relocs; 2893 erelaend = erela + section->reloc_count; 2894 irela = internal_relocs; 2895 for (; erela < erelaend; erela++, irela++) 2896 bfd_elf32_swap_reloca_in (input_bfd, erela, irela); 2897 2898 /* We're done with the external relocs, free them. */ 2899 free (external_relocs); 2900 2901 /* Now examine each relocation. */ 2902 irela = internal_relocs; 2903 irelaend = irela + section->reloc_count; 2904 for (; irela < irelaend; irela++) 2905 { 2906 unsigned int r_type, r_indx; 2907 enum elf32_hppa_stub_type stub_type; 2908 struct elf32_hppa_stub_hash_entry *stub_entry; 2909 asection *sym_sec; 2910 bfd_vma sym_value; 2911 bfd_vma destination; 2912 struct elf32_hppa_link_hash_entry *hash; 2913 char *stub_name; 2914 const asection *id_sec; 2915 2916 r_type = ELF32_R_TYPE (irela->r_info); 2917 r_indx = ELF32_R_SYM (irela->r_info); 2918 2919 if (r_type >= (unsigned int) R_PARISC_UNIMPLEMENTED) 2920 { 2921 bfd_set_error (bfd_error_bad_value); 2922 goto error_ret_free_internal; 2923 } 2924 2925 /* Only look for stubs on call instructions. */ 2926 if (r_type != (unsigned int) R_PARISC_PCREL12F 2927 && r_type != (unsigned int) R_PARISC_PCREL17F 2928 && r_type != (unsigned int) R_PARISC_PCREL22F) 2929 continue; 2930 2931 /* Now determine the call target, its name, value, 2932 section. */ 2933 sym_sec = NULL; 2934 sym_value = 0; 2935 destination = 0; 2936 hash = NULL; 2937 if (r_indx < symtab_hdr->sh_info) 2938 { 2939 /* It's a local symbol. */ 2940 Elf_Internal_Sym *sym; 2941 Elf_Internal_Shdr *hdr; 2942 2943 sym = local_syms + r_indx; 2944 hdr = elf_elfsections (input_bfd)[sym->st_shndx]; 2945 sym_sec = hdr->bfd_section; 2946 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) 2947 sym_value = sym->st_value; 2948 destination = (sym_value + irela->r_addend 2949 + sym_sec->output_offset 2950 + sym_sec->output_section->vma); 2951 } 2952 else 2953 { 2954 /* It's an external symbol. */ 2955 int e_indx; 2956 2957 e_indx = r_indx - symtab_hdr->sh_info; 2958 hash = ((struct elf32_hppa_link_hash_entry *) 2959 elf_sym_hashes (input_bfd)[e_indx]); 2960 2961 while (hash->elf.root.type == bfd_link_hash_indirect 2962 || hash->elf.root.type == bfd_link_hash_warning) 2963 hash = ((struct elf32_hppa_link_hash_entry *) 2964 hash->elf.root.u.i.link); 2965 2966 if (hash->elf.root.type == bfd_link_hash_defined 2967 || hash->elf.root.type == bfd_link_hash_defweak) 2968 { 2969 sym_sec = hash->elf.root.u.def.section; 2970 sym_value = hash->elf.root.u.def.value; 2971 if (sym_sec->output_section != NULL) 2972 destination = (sym_value + irela->r_addend 2973 + sym_sec->output_offset 2974 + sym_sec->output_section->vma); 2975 } 2976 else if (hash->elf.root.type == bfd_link_hash_undefweak) 2977 { 2978 if (! info->shared) 2979 continue; 2980 } 2981 else if (hash->elf.root.type == bfd_link_hash_undefined) 2982 { 2983 if (! (info->shared 2984 && !info->no_undefined 2985 && (ELF_ST_VISIBILITY (hash->elf.other) 2986 == STV_DEFAULT))) 2987 continue; 2988 } 2989 else 2990 { 2991 bfd_set_error (bfd_error_bad_value); 2992 goto error_ret_free_internal; 2993 } 2994 } 2995 2996 /* Determine what (if any) linker stub is needed. */ 2997 stub_type = hppa_type_of_stub (section, irela, hash, 2998 destination); 2999 if (stub_type == hppa_stub_none) 3000 continue; 3001 3002 /* Support for grouping stub sections. */ 3003 id_sec = hplink->stub_group[section->id].link_sec; 3004 3005 /* Get the name of this stub. */ 3006 stub_name = hppa_stub_name (id_sec, sym_sec, hash, irela); 3007 if (!stub_name) 3008 goto error_ret_free_internal; 3009 3010 stub_entry = hppa_stub_hash_lookup (&hplink->stub_hash_table, 3011 stub_name, 3012 false, false); 3013 if (stub_entry != NULL) 3014 { 3015 /* The proper stub has already been created. */ 3016 free (stub_name); 3017 continue; 3018 } 3019 3020 stub_entry = hppa_add_stub (stub_name, section, hplink); 3021 if (stub_entry == NULL) 3022 { 3023 free (stub_name); 3024 goto error_ret_free_local; 3025 } 3026 3027 stub_entry->target_value = sym_value; 3028 stub_entry->target_section = sym_sec; 3029 stub_entry->stub_type = stub_type; 3030 if (info->shared) 3031 { 3032 if (stub_type == hppa_stub_import) 3033 stub_entry->stub_type = hppa_stub_import_shared; 3034 else if (stub_type == hppa_stub_long_branch 3035 && (LONG_BRANCH_PIC_IN_SHLIB || hash == NULL)) 3036 stub_entry->stub_type = hppa_stub_long_branch_shared; 3037 } 3038 stub_entry->h = hash; 3039 stub_changed = 1; 3040 } 3041 3042 /* We're done with the internal relocs, free them. */ 3043 free (internal_relocs); 3044 } 3045 } 3046 3047 if (!stub_changed) 3048 break; 3049 3050 /* OK, we've added some stubs. Find out the new size of the 3051 stub sections. */ 3052 for (stub_sec = hplink->stub_bfd->sections; 3053 stub_sec != NULL; 3054 stub_sec = stub_sec->next) 3055 { 3056 stub_sec->_raw_size = 0; 3057 stub_sec->_cooked_size = 0; 3058 } 3059 #if ! LONG_BRANCH_PIC_IN_SHLIB 3060 { 3061 int i; 3062 3063 for (i = top_id; i >= 0; --i) 3064 { 3065 /* This will probably hit the same section many times.. */ 3066 stub_sec = hplink->stub_group[i].reloc_sec; 3067 if (stub_sec != NULL) 3068 { 3069 stub_sec->_raw_size = 0; 3070 stub_sec->_cooked_size = 0; 3071 } 3072 } 3073 } 3074 #endif 3075 3076 bfd_hash_traverse (&hplink->stub_hash_table, 3077 hppa_size_one_stub, 3078 hplink); 3079 3080 /* Ask the linker to do its stuff. */ 3081 (*hplink->layout_sections_again) (); 3082 stub_changed = 0; 3083 } 3084 3085 ret = 1; 3086 3087 error_ret_free_local: 3088 while (bfd_count-- > 0) 3089 if (all_local_syms[bfd_count]) 3090 free (all_local_syms[bfd_count]); 3091 free (all_local_syms); 3092 3093 return ret; 3094 } 3095 3096 /* For a final link, this function is called after we have sized the 3097 stubs to provide a value for __gp. */ 3098 3099 boolean 3100 elf32_hppa_set_gp (abfd, info) 3101 bfd *abfd; 3102 struct bfd_link_info *info; 3103 { 3104 struct elf32_hppa_link_hash_table *hplink; 3105 struct elf_link_hash_entry *h; 3106 asection *sec; 3107 bfd_vma gp_val; 3108 3109 hplink = hppa_link_hash_table (info); 3110 h = elf_link_hash_lookup (&hplink->root, "$global$", 3111 false, false, false); 3112 3113 if (h != NULL 3114 && (h->root.type == bfd_link_hash_defined 3115 || h->root.type == bfd_link_hash_defweak)) 3116 { 3117 gp_val = h->root.u.def.value; 3118 sec = h->root.u.def.section; 3119 } 3120 else 3121 { 3122 /* Choose to point our LTP at, in this order, one of .plt, .got, 3123 or .data, if these sections exist. In the case of choosing 3124 .plt try to make the LTP ideal for addressing anywhere in the 3125 .plt or .got with a 14 bit signed offset. Typically, the end 3126 of the .plt is the start of the .got, so choose .plt + 0x2000 3127 if either the .plt or .got is larger than 0x2000. If both 3128 the .plt and .got are smaller than 0x2000, choose the end of 3129 the .plt section. */ 3130 3131 sec = hplink->splt; 3132 if (sec != NULL) 3133 { 3134 gp_val = sec->_raw_size; 3135 if (gp_val > 0x2000 3136 || (hplink->sgot && hplink->sgot->_raw_size > 0x2000)) 3137 { 3138 gp_val = 0x2000; 3139 } 3140 } 3141 else 3142 { 3143 gp_val = 0; 3144 sec = hplink->sgot; 3145 if (sec != NULL) 3146 { 3147 /* We know we don't have a .plt. If .got is large, 3148 offset our LTP. */ 3149 if (sec->_raw_size > 0x2000) 3150 gp_val = 0x2000; 3151 } 3152 else 3153 { 3154 /* No .plt or .got. Who cares what the LTP is? */ 3155 sec = bfd_get_section_by_name (abfd, ".data"); 3156 } 3157 } 3158 3159 if (h != NULL) 3160 { 3161 h->root.type = bfd_link_hash_defined; 3162 h->root.u.def.value = gp_val; 3163 if (sec != NULL) 3164 h->root.u.def.section = sec; 3165 else 3166 h->root.u.def.section = bfd_abs_section_ptr; 3167 } 3168 } 3169 3170 if (sec != NULL && sec->output_section != NULL) 3171 gp_val += sec->output_section->vma + sec->output_offset; 3172 3173 elf_gp (abfd) = gp_val; 3174 return true; 3175 } 3176 3177 /* Build all the stubs associated with the current output file. The 3178 stubs are kept in a hash table attached to the main linker hash 3179 table. We also set up the .plt entries for statically linked PIC 3180 functions here. This function is called via hppaelf_finish in the 3181 linker. */ 3182 3183 boolean 3184 elf32_hppa_build_stubs (info) 3185 struct bfd_link_info *info; 3186 { 3187 asection *stub_sec; 3188 struct bfd_hash_table *table; 3189 struct elf32_hppa_link_hash_table *hplink; 3190 3191 hplink = hppa_link_hash_table (info); 3192 3193 for (stub_sec = hplink->stub_bfd->sections; 3194 stub_sec != NULL; 3195 stub_sec = stub_sec->next) 3196 { 3197 size_t size; 3198 3199 /* Allocate memory to hold the linker stubs. */ 3200 size = stub_sec->_raw_size; 3201 stub_sec->contents = (unsigned char *) bfd_zalloc (hplink->stub_bfd, 3202 size); 3203 if (stub_sec->contents == NULL && size != 0) 3204 return false; 3205 stub_sec->_raw_size = 0; 3206 } 3207 3208 /* Build the stubs as directed by the stub hash table. */ 3209 table = &hplink->stub_hash_table; 3210 bfd_hash_traverse (table, hppa_build_one_stub, info); 3211 3212 return true; 3213 } 3214 3215 /* Perform a final link. */ 3216 3217 static boolean 3218 elf32_hppa_final_link (abfd, info) 3219 bfd *abfd; 3220 struct bfd_link_info *info; 3221 { 3222 asection *s; 3223 3224 /* Invoke the regular ELF linker to do all the work. */ 3225 if (!bfd_elf32_bfd_final_link (abfd, info)) 3226 return false; 3227 3228 /* If we're producing a final executable, sort the contents of the 3229 unwind section. Magic section names, but this is much safer than 3230 having elf32_hppa_relocate_section remember where SEGREL32 relocs 3231 occurred. Consider what happens if someone inept creates a 3232 linker script that puts unwind information in .text. */ 3233 s = bfd_get_section_by_name (abfd, ".PARISC.unwind"); 3234 if (s != NULL) 3235 { 3236 bfd_size_type size; 3237 char *contents; 3238 3239 size = s->_raw_size; 3240 contents = bfd_malloc (size); 3241 if (contents == NULL) 3242 return false; 3243 3244 if (! bfd_get_section_contents (abfd, s, contents, (file_ptr) 0, size)) 3245 return false; 3246 3247 qsort (contents, size / 16, 16, hppa_unwind_entry_compare); 3248 3249 if (! bfd_set_section_contents (abfd, s, contents, (file_ptr) 0, size)) 3250 return false; 3251 } 3252 return true; 3253 } 3254 3255 /* Record the lowest address for the data and text segments. */ 3256 3257 static void 3258 hppa_record_segment_addr (abfd, section, data) 3259 bfd *abfd ATTRIBUTE_UNUSED; 3260 asection *section; 3261 PTR data; 3262 { 3263 struct elf32_hppa_link_hash_table *hplink; 3264 3265 hplink = (struct elf32_hppa_link_hash_table *) data; 3266 3267 if ((section->flags & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD)) 3268 { 3269 bfd_vma value = section->vma - section->filepos; 3270 3271 if ((section->flags & SEC_READONLY) != 0) 3272 { 3273 if (value < hplink->text_segment_base) 3274 hplink->text_segment_base = value; 3275 } 3276 else 3277 { 3278 if (value < hplink->data_segment_base) 3279 hplink->data_segment_base = value; 3280 } 3281 } 3282 } 3283 3284 /* Perform a relocation as part of a final link. */ 3285 3286 static bfd_reloc_status_type 3287 final_link_relocate (input_section, contents, rel, value, hplink, sym_sec, h) 3288 asection *input_section; 3289 bfd_byte *contents; 3290 const Elf_Internal_Rela *rel; 3291 bfd_vma value; 3292 struct elf32_hppa_link_hash_table *hplink; 3293 asection *sym_sec; 3294 struct elf32_hppa_link_hash_entry *h; 3295 { 3296 int insn; 3297 unsigned int r_type = ELF32_R_TYPE (rel->r_info); 3298 reloc_howto_type *howto = elf_hppa_howto_table + r_type; 3299 int r_format = howto->bitsize; 3300 enum hppa_reloc_field_selector_type_alt r_field; 3301 bfd *input_bfd = input_section->owner; 3302 bfd_vma offset = rel->r_offset; 3303 bfd_vma max_branch_offset = 0; 3304 bfd_byte *hit_data = contents + offset; 3305 bfd_signed_vma addend = rel->r_addend; 3306 bfd_vma location; 3307 struct elf32_hppa_stub_hash_entry *stub_entry = NULL; 3308 int val; 3309 3310 if (r_type == R_PARISC_NONE) 3311 return bfd_reloc_ok; 3312 3313 insn = bfd_get_32 (input_bfd, hit_data); 3314 3315 /* Find out where we are and where we're going. */ 3316 location = (offset + 3317 input_section->output_offset + 3318 input_section->output_section->vma); 3319 3320 switch (r_type) 3321 { 3322 case R_PARISC_PCREL12F: 3323 case R_PARISC_PCREL17F: 3324 case R_PARISC_PCREL22F: 3325 /* If this is a call to a function defined in another dynamic 3326 library, or if it is a call to a PIC function in the same 3327 object, or if this is a shared link and it is a call to a 3328 weak symbol which may or may not be in the same object, then 3329 find the import stub in the stub hash. */ 3330 if (sym_sec == NULL 3331 || sym_sec->output_section == NULL 3332 || (h != NULL 3333 && ((h->maybe_pic_call 3334 && !(input_section->flags & SEC_HAS_GOT_REF)) 3335 || (h->elf.root.type == bfd_link_hash_defweak 3336 && h->elf.dynindx != -1 3337 && h->elf.plt.offset != (bfd_vma) -1)))) 3338 { 3339 stub_entry = hppa_get_stub_entry (input_section, sym_sec, 3340 h, rel, hplink); 3341 if (stub_entry != NULL) 3342 { 3343 value = (stub_entry->stub_offset 3344 + stub_entry->stub_sec->output_offset 3345 + stub_entry->stub_sec->output_section->vma); 3346 addend = 0; 3347 } 3348 else if (sym_sec == NULL && h != NULL 3349 && h->elf.root.type == bfd_link_hash_undefweak) 3350 { 3351 /* It's OK if undefined weak. Calls to undefined weak 3352 symbols behave as if the "called" function 3353 immediately returns. We can thus call to a weak 3354 function without first checking whether the function 3355 is defined. */ 3356 value = location; 3357 addend = 8; 3358 } 3359 else 3360 return bfd_reloc_notsupported; 3361 } 3362 /* Fall thru. */ 3363 3364 case R_PARISC_PCREL21L: 3365 case R_PARISC_PCREL17C: 3366 case R_PARISC_PCREL17R: 3367 case R_PARISC_PCREL14R: 3368 case R_PARISC_PCREL14F: 3369 /* Make it a pc relative offset. */ 3370 value -= location; 3371 addend -= 8; 3372 break; 3373 3374 case R_PARISC_DPREL21L: 3375 case R_PARISC_DPREL14R: 3376 case R_PARISC_DPREL14F: 3377 /* For all the DP relative relocations, we need to examine the symbol's 3378 section. If it's a code section, then "data pointer relative" makes 3379 no sense. In that case we don't adjust the "value", and for 21 bit 3380 addil instructions, we change the source addend register from %dp to 3381 %r0. This situation commonly arises when a variable's "constness" 3382 is declared differently from the way the variable is defined. For 3383 instance: "extern int foo" with foo defined as "const int foo". */ 3384 if (sym_sec == NULL) 3385 break; 3386 if ((sym_sec->flags & SEC_CODE) != 0) 3387 { 3388 if ((insn & ((0x3f << 26) | (0x1f << 21))) 3389 == (((int) OP_ADDIL << 26) | (27 << 21))) 3390 { 3391 insn &= ~ (0x1f << 21); 3392 #if 1 /* debug them. */ 3393 (*_bfd_error_handler) 3394 (_("%s(%s+0x%lx): fixing %s"), 3395 bfd_get_filename (input_bfd), 3396 input_section->name, 3397 (long) rel->r_offset, 3398 howto->name); 3399 #endif 3400 } 3401 /* Now try to make things easy for the dynamic linker. */ 3402 3403 break; 3404 } 3405 /* Fall thru. */ 3406 3407 case R_PARISC_DLTIND21L: 3408 case R_PARISC_DLTIND14R: 3409 case R_PARISC_DLTIND14F: 3410 value -= elf_gp (input_section->output_section->owner); 3411 break; 3412 3413 case R_PARISC_SEGREL32: 3414 if ((sym_sec->flags & SEC_CODE) != 0) 3415 value -= hplink->text_segment_base; 3416 else 3417 value -= hplink->data_segment_base; 3418 break; 3419 3420 default: 3421 break; 3422 } 3423 3424 switch (r_type) 3425 { 3426 case R_PARISC_DIR32: 3427 case R_PARISC_DIR14F: 3428 case R_PARISC_DIR17F: 3429 case R_PARISC_PCREL17C: 3430 case R_PARISC_PCREL14F: 3431 case R_PARISC_DPREL14F: 3432 case R_PARISC_PLABEL32: 3433 case R_PARISC_DLTIND14F: 3434 case R_PARISC_SEGBASE: 3435 case R_PARISC_SEGREL32: 3436 r_field = e_fsel; 3437 break; 3438 3439 case R_PARISC_DIR21L: 3440 case R_PARISC_PCREL21L: 3441 case R_PARISC_DPREL21L: 3442 case R_PARISC_PLABEL21L: 3443 case R_PARISC_DLTIND21L: 3444 r_field = e_lrsel; 3445 break; 3446 3447 case R_PARISC_DIR17R: 3448 case R_PARISC_PCREL17R: 3449 case R_PARISC_DIR14R: 3450 case R_PARISC_PCREL14R: 3451 case R_PARISC_DPREL14R: 3452 case R_PARISC_PLABEL14R: 3453 case R_PARISC_DLTIND14R: 3454 r_field = e_rrsel; 3455 break; 3456 3457 case R_PARISC_PCREL12F: 3458 case R_PARISC_PCREL17F: 3459 case R_PARISC_PCREL22F: 3460 r_field = e_fsel; 3461 3462 if (r_type == (unsigned int) R_PARISC_PCREL17F) 3463 { 3464 max_branch_offset = (1 << (17-1)) << 2; 3465 } 3466 else if (r_type == (unsigned int) R_PARISC_PCREL12F) 3467 { 3468 max_branch_offset = (1 << (12-1)) << 2; 3469 } 3470 else 3471 { 3472 max_branch_offset = (1 << (22-1)) << 2; 3473 } 3474 3475 /* sym_sec is NULL on undefined weak syms or when shared on 3476 undefined syms. We've already checked for a stub for the 3477 shared undefined case. */ 3478 if (sym_sec == NULL) 3479 break; 3480 3481 /* If the branch is out of reach, then redirect the 3482 call to the local stub for this function. */ 3483 if (value + addend + max_branch_offset >= 2*max_branch_offset) 3484 { 3485 stub_entry = hppa_get_stub_entry (input_section, sym_sec, 3486 h, rel, hplink); 3487 if (stub_entry == NULL) 3488 return bfd_reloc_notsupported; 3489 3490 /* Munge up the value and addend so that we call the stub 3491 rather than the procedure directly. */ 3492 value = (stub_entry->stub_offset 3493 + stub_entry->stub_sec->output_offset 3494 + stub_entry->stub_sec->output_section->vma 3495 - location); 3496 addend = -8; 3497 } 3498 break; 3499 3500 /* Something we don't know how to handle. */ 3501 default: 3502 return bfd_reloc_notsupported; 3503 } 3504 3505 /* Make sure we can reach the stub. */ 3506 if (max_branch_offset != 0 3507 && value + addend + max_branch_offset >= 2*max_branch_offset) 3508 { 3509 (*_bfd_error_handler) 3510 (_("%s(%s+0x%lx): cannot reach %s, recompile with -ffunction-sections"), 3511 bfd_get_filename (input_bfd), 3512 input_section->name, 3513 (long) rel->r_offset, 3514 stub_entry->root.string); 3515 return bfd_reloc_notsupported; 3516 } 3517 3518 val = hppa_field_adjust (value, addend, r_field); 3519 3520 switch (r_type) 3521 { 3522 case R_PARISC_PCREL12F: 3523 case R_PARISC_PCREL17C: 3524 case R_PARISC_PCREL17F: 3525 case R_PARISC_PCREL17R: 3526 case R_PARISC_PCREL22F: 3527 case R_PARISC_DIR17F: 3528 case R_PARISC_DIR17R: 3529 /* This is a branch. Divide the offset by four. 3530 Note that we need to decide whether it's a branch or 3531 otherwise by inspecting the reloc. Inspecting insn won't 3532 work as insn might be from a .word directive. */ 3533 val >>= 2; 3534 break; 3535 3536 default: 3537 break; 3538 } 3539 3540 insn = hppa_rebuild_insn (insn, val, r_format); 3541 3542 /* Update the instruction word. */ 3543 bfd_put_32 (input_bfd, (bfd_vma) insn, hit_data); 3544 return bfd_reloc_ok; 3545 } 3546 3547 /* Relocate an HPPA ELF section. */ 3548 3549 static boolean 3550 elf32_hppa_relocate_section (output_bfd, info, input_bfd, input_section, 3551 contents, relocs, local_syms, local_sections) 3552 bfd *output_bfd; 3553 struct bfd_link_info *info; 3554 bfd *input_bfd; 3555 asection *input_section; 3556 bfd_byte *contents; 3557 Elf_Internal_Rela *relocs; 3558 Elf_Internal_Sym *local_syms; 3559 asection **local_sections; 3560 { 3561 bfd *dynobj; 3562 bfd_vma *local_got_offsets; 3563 struct elf32_hppa_link_hash_table *hplink; 3564 Elf_Internal_Shdr *symtab_hdr; 3565 Elf_Internal_Rela *rel; 3566 Elf_Internal_Rela *relend; 3567 asection *sreloc; 3568 3569 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 3570 3571 hplink = hppa_link_hash_table (info); 3572 dynobj = hplink->root.dynobj; 3573 local_got_offsets = elf_local_got_offsets (input_bfd); 3574 sreloc = NULL; 3575 3576 rel = relocs; 3577 relend = relocs + input_section->reloc_count; 3578 for (; rel < relend; rel++) 3579 { 3580 unsigned int r_type; 3581 reloc_howto_type *howto; 3582 unsigned int r_symndx; 3583 struct elf32_hppa_link_hash_entry *h; 3584 Elf_Internal_Sym *sym; 3585 asection *sym_sec; 3586 bfd_vma relocation; 3587 bfd_reloc_status_type r; 3588 const char *sym_name; 3589 boolean plabel; 3590 3591 r_type = ELF32_R_TYPE (rel->r_info); 3592 if (r_type >= (unsigned int) R_PARISC_UNIMPLEMENTED) 3593 { 3594 bfd_set_error (bfd_error_bad_value); 3595 return false; 3596 } 3597 if (r_type == (unsigned int) R_PARISC_GNU_VTENTRY 3598 || r_type == (unsigned int) R_PARISC_GNU_VTINHERIT) 3599 continue; 3600 3601 r_symndx = ELF32_R_SYM (rel->r_info); 3602 3603 if (info->relocateable) 3604 { 3605 /* This is a relocateable link. We don't have to change 3606 anything, unless the reloc is against a section symbol, 3607 in which case we have to adjust according to where the 3608 section symbol winds up in the output section. */ 3609 if (r_symndx < symtab_hdr->sh_info) 3610 { 3611 sym = local_syms + r_symndx; 3612 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) 3613 { 3614 sym_sec = local_sections[r_symndx]; 3615 rel->r_addend += sym_sec->output_offset; 3616 } 3617 } 3618 continue; 3619 } 3620 3621 /* This is a final link. */ 3622 h = NULL; 3623 sym = NULL; 3624 sym_sec = NULL; 3625 if (r_symndx < symtab_hdr->sh_info) 3626 { 3627 /* This is a local symbol, h defaults to NULL. */ 3628 sym = local_syms + r_symndx; 3629 sym_sec = local_sections[r_symndx]; 3630 relocation = ((ELF_ST_TYPE (sym->st_info) == STT_SECTION 3631 ? 0 : sym->st_value) 3632 + sym_sec->output_offset 3633 + sym_sec->output_section->vma); 3634 } 3635 else 3636 { 3637 int indx; 3638 3639 /* It's a global; Find its entry in the link hash. */ 3640 indx = r_symndx - symtab_hdr->sh_info; 3641 h = ((struct elf32_hppa_link_hash_entry *) 3642 elf_sym_hashes (input_bfd)[indx]); 3643 while (h->elf.root.type == bfd_link_hash_indirect 3644 || h->elf.root.type == bfd_link_hash_warning) 3645 h = (struct elf32_hppa_link_hash_entry *) h->elf.root.u.i.link; 3646 3647 relocation = 0; 3648 if (h->elf.root.type == bfd_link_hash_defined 3649 || h->elf.root.type == bfd_link_hash_defweak) 3650 { 3651 sym_sec = h->elf.root.u.def.section; 3652 /* If sym_sec->output_section is NULL, then it's a 3653 symbol defined in a shared library. */ 3654 if (sym_sec->output_section != NULL) 3655 relocation = (h->elf.root.u.def.value 3656 + sym_sec->output_offset 3657 + sym_sec->output_section->vma); 3658 } 3659 else if (h->elf.root.type == bfd_link_hash_undefweak) 3660 ; 3661 else if (info->shared && !info->no_undefined 3662 && ELF_ST_VISIBILITY (h->elf.other) == STV_DEFAULT 3663 && h->elf.type != STT_PARISC_MILLI) 3664 { 3665 if (info->symbolic) 3666 if (!((*info->callbacks->undefined_symbol) 3667 (info, h->elf.root.root.string, input_bfd, 3668 input_section, rel->r_offset, false))) 3669 return false; 3670 } 3671 else 3672 { 3673 if (!((*info->callbacks->undefined_symbol) 3674 (info, h->elf.root.root.string, input_bfd, 3675 input_section, rel->r_offset, true))) 3676 return false; 3677 } 3678 } 3679 3680 /* Do any required modifications to the relocation value, and 3681 determine what types of dynamic info we need to output, if 3682 any. */ 3683 plabel = 0; 3684 switch (r_type) 3685 { 3686 case R_PARISC_DLTIND14F: 3687 case R_PARISC_DLTIND14R: 3688 case R_PARISC_DLTIND21L: 3689 /* Relocation is to the entry for this symbol in the global 3690 offset table. */ 3691 if (h != NULL) 3692 { 3693 bfd_vma off; 3694 boolean dyn; 3695 3696 off = h->elf.got.offset; 3697 if (off == (bfd_vma) -1) 3698 abort (); 3699 3700 dyn = hplink->root.dynamic_sections_created; 3701 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, &h->elf)) 3702 { 3703 /* This is actually a static link, or it is a 3704 -Bsymbolic link and the symbol is defined 3705 locally, or the symbol was forced to be local 3706 because of a version file. We must initialize 3707 this entry in the global offset table. Since the 3708 offset must always be a multiple of 4, we use the 3709 least significant bit to record whether we have 3710 initialized it already. 3711 3712 When doing a dynamic link, we create a .rela.got 3713 relocation entry to initialize the value. This 3714 is done in the finish_dynamic_symbol routine. */ 3715 if ((off & 1) != 0) 3716 off &= ~1; 3717 else 3718 { 3719 bfd_put_32 (output_bfd, relocation, 3720 hplink->sgot->contents + off); 3721 h->elf.got.offset |= 1; 3722 } 3723 } 3724 3725 relocation = off; 3726 } 3727 else 3728 { 3729 /* Local symbol case. */ 3730 bfd_vma off; 3731 3732 if (local_got_offsets == NULL 3733 || (off = local_got_offsets[r_symndx]) == (bfd_vma) -1) 3734 abort (); 3735 3736 /* The offset must always be a multiple of 4. We use 3737 the least significant bit to record whether we have 3738 already generated the necessary reloc. */ 3739 if ((off & 1) != 0) 3740 off &= ~1; 3741 else 3742 { 3743 bfd_put_32 (output_bfd, relocation, 3744 hplink->sgot->contents + off); 3745 3746 if (info->shared) 3747 { 3748 /* Output a dynamic relocation for this GOT 3749 entry. In this case it is relative to the 3750 base of the object because the symbol index 3751 is zero. */ 3752 Elf_Internal_Rela outrel; 3753 asection *srelgot = hplink->srelgot; 3754 3755 outrel.r_offset = (off 3756 + hplink->sgot->output_offset 3757 + hplink->sgot->output_section->vma); 3758 outrel.r_info = ELF32_R_INFO (0, R_PARISC_DIR32); 3759 outrel.r_addend = relocation; 3760 bfd_elf32_swap_reloca_out (output_bfd, &outrel, 3761 ((Elf32_External_Rela *) 3762 srelgot->contents 3763 + srelgot->reloc_count)); 3764 ++srelgot->reloc_count; 3765 } 3766 3767 local_got_offsets[r_symndx] |= 1; 3768 } 3769 3770 relocation = off; 3771 } 3772 3773 /* Add the base of the GOT to the relocation value. */ 3774 relocation += (hplink->sgot->output_offset 3775 + hplink->sgot->output_section->vma); 3776 break; 3777 3778 case R_PARISC_SEGREL32: 3779 /* If this is the first SEGREL relocation, then initialize 3780 the segment base values. */ 3781 if (hplink->text_segment_base == (bfd_vma) -1) 3782 bfd_map_over_sections (output_bfd, 3783 hppa_record_segment_addr, 3784 hplink); 3785 break; 3786 3787 case R_PARISC_PLABEL14R: 3788 case R_PARISC_PLABEL21L: 3789 case R_PARISC_PLABEL32: 3790 if (hplink->root.dynamic_sections_created) 3791 { 3792 bfd_vma off; 3793 3794 /* If we have a global symbol with a PLT slot, then 3795 redirect this relocation to it. */ 3796 if (h != NULL) 3797 { 3798 off = h->elf.plt.offset; 3799 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, &h->elf)) 3800 { 3801 /* In a non-shared link, adjust_dynamic_symbols 3802 isn't called for symbols forced local. We 3803 need to write out the plt entry here. */ 3804 if ((off & 1) != 0) 3805 off &= ~1; 3806 else 3807 { 3808 bfd_put_32 (output_bfd, 3809 relocation, 3810 hplink->splt->contents + off); 3811 bfd_put_32 (output_bfd, 3812 elf_gp (hplink->splt->output_section->owner), 3813 hplink->splt->contents + off + 4); 3814 h->elf.plt.offset |= 1; 3815 } 3816 } 3817 } 3818 else 3819 { 3820 int indx; 3821 3822 indx = r_symndx + symtab_hdr->sh_info; 3823 off = local_got_offsets[indx]; 3824 3825 /* As for the local .got entry case, we use the last 3826 bit to record whether we've already initialised 3827 this local .plt entry. */ 3828 if ((off & 1) != 0) 3829 off &= ~1; 3830 else 3831 { 3832 bfd_put_32 (output_bfd, 3833 relocation, 3834 hplink->splt->contents + off); 3835 bfd_put_32 (output_bfd, 3836 elf_gp (hplink->splt->output_section->owner), 3837 hplink->splt->contents + off + 4); 3838 3839 if (info->shared) 3840 { 3841 /* Output a dynamic IPLT relocation for this 3842 PLT entry. */ 3843 Elf_Internal_Rela outrel; 3844 asection *srelplt = hplink->srelplt; 3845 3846 outrel.r_offset = (off 3847 + hplink->splt->output_offset 3848 + hplink->splt->output_section->vma); 3849 outrel.r_info = ELF32_R_INFO (0, R_PARISC_IPLT); 3850 outrel.r_addend = relocation; 3851 bfd_elf32_swap_reloca_out (output_bfd, &outrel, 3852 ((Elf32_External_Rela *) 3853 srelplt->contents 3854 + srelplt->reloc_count)); 3855 ++srelplt->reloc_count; 3856 } 3857 3858 local_got_offsets[indx] |= 1; 3859 } 3860 } 3861 3862 if (off >= (bfd_vma) -2 || (off & 1) != 0) 3863 abort (); 3864 3865 /* PLABELs contain function pointers. Relocation is to 3866 the entry for the function in the .plt. The magic +2 3867 offset signals to $$dyncall that the function pointer 3868 is in the .plt and thus has a gp pointer too. 3869 Exception: Undefined PLABELs should have a value of 3870 zero. */ 3871 if (h == NULL 3872 || (h->elf.root.type != bfd_link_hash_undefweak 3873 && h->elf.root.type != bfd_link_hash_undefined)) 3874 { 3875 relocation = (off 3876 + hplink->splt->output_offset 3877 + hplink->splt->output_section->vma 3878 + 2); 3879 } 3880 plabel = 1; 3881 } 3882 /* Fall through and possibly emit a dynamic relocation. */ 3883 3884 case R_PARISC_DIR17F: 3885 case R_PARISC_DIR17R: 3886 case R_PARISC_DIR14F: 3887 case R_PARISC_DIR14R: 3888 case R_PARISC_DIR21L: 3889 case R_PARISC_DPREL14F: 3890 case R_PARISC_DPREL14R: 3891 case R_PARISC_DPREL21L: 3892 case R_PARISC_DIR32: 3893 /* The reloc types handled here and this conditional 3894 expression must match the code in check_relocs and 3895 hppa_discard_copies. ie. We need exactly the same 3896 condition as in check_relocs, with some extra conditions 3897 (dynindx test in this case) to cater for relocs removed 3898 by hppa_discard_copies. */ 3899 if ((input_section->flags & SEC_ALLOC) != 0 3900 && info->shared 3901 #if RELATIVE_DYNAMIC_RELOCS 3902 && (is_absolute_reloc (r_type) 3903 || ((!info->symbolic 3904 || (h != NULL 3905 && ((h->elf.elf_link_hash_flags 3906 & ELF_LINK_HASH_DEF_REGULAR) == 0 3907 || h->elf.root.type == bfd_link_hash_defweak))) 3908 && (h == NULL || h->elf.dynindx != -1))) 3909 #endif 3910 ) 3911 { 3912 Elf_Internal_Rela outrel; 3913 boolean skip; 3914 3915 /* When generating a shared object, these relocations 3916 are copied into the output file to be resolved at run 3917 time. */ 3918 3919 if (sreloc == NULL) 3920 { 3921 const char *name; 3922 3923 name = (bfd_elf_string_from_elf_section 3924 (input_bfd, 3925 elf_elfheader (input_bfd)->e_shstrndx, 3926 elf_section_data (input_section)->rel_hdr.sh_name)); 3927 if (name == NULL) 3928 return false; 3929 sreloc = bfd_get_section_by_name (dynobj, name); 3930 if (sreloc == NULL) 3931 abort (); 3932 } 3933 3934 outrel.r_offset = rel->r_offset; 3935 outrel.r_addend = rel->r_addend; 3936 skip = false; 3937 if (elf_section_data (input_section)->stab_info != NULL) 3938 { 3939 bfd_vma off; 3940 3941 off = (_bfd_stab_section_offset 3942 (output_bfd, &hplink->root.stab_info, 3943 input_section, 3944 &elf_section_data (input_section)->stab_info, 3945 rel->r_offset)); 3946 if (off == (bfd_vma) -1) 3947 skip = true; 3948 outrel.r_offset = off; 3949 } 3950 3951 outrel.r_offset += (input_section->output_offset 3952 + input_section->output_section->vma); 3953 3954 if (skip) 3955 { 3956 memset (&outrel, 0, sizeof (outrel)); 3957 } 3958 else if (h != NULL 3959 && h->elf.dynindx != -1 3960 && (plabel 3961 || !info->symbolic 3962 || (h->elf.elf_link_hash_flags 3963 & ELF_LINK_HASH_DEF_REGULAR) == 0)) 3964 { 3965 outrel.r_info = ELF32_R_INFO (h->elf.dynindx, r_type); 3966 } 3967 else /* It's a local symbol, or one marked to become local. */ 3968 { 3969 int indx = 0; 3970 3971 /* Add the absolute offset of the symbol. */ 3972 outrel.r_addend += relocation; 3973 3974 /* Global plabels need to be processed by the 3975 dynamic linker so that functions have at most one 3976 fptr. For this reason, we need to differentiate 3977 between global and local plabels, which we do by 3978 providing the function symbol for a global plabel 3979 reloc, and no symbol for local plabels. */ 3980 if (! plabel 3981 && sym_sec != NULL 3982 && sym_sec->output_section != NULL 3983 && ! bfd_is_abs_section (sym_sec)) 3984 { 3985 indx = elf_section_data (sym_sec->output_section)->dynindx; 3986 /* We are turning this relocation into one 3987 against a section symbol, so subtract out the 3988 output section's address but not the offset 3989 of the input section in the output section. */ 3990 outrel.r_addend -= sym_sec->output_section->vma; 3991 } 3992 3993 outrel.r_info = ELF32_R_INFO (indx, r_type); 3994 } 3995 3996 bfd_elf32_swap_reloca_out (output_bfd, &outrel, 3997 ((Elf32_External_Rela *) 3998 sreloc->contents 3999 + sreloc->reloc_count)); 4000 ++sreloc->reloc_count; 4001 } 4002 break; 4003 4004 default: 4005 break; 4006 } 4007 4008 r = final_link_relocate (input_section, contents, rel, relocation, 4009 hplink, sym_sec, h); 4010 4011 if (r == bfd_reloc_ok) 4012 continue; 4013 4014 if (h != NULL) 4015 sym_name = h->elf.root.root.string; 4016 else 4017 { 4018 sym_name = bfd_elf_string_from_elf_section (input_bfd, 4019 symtab_hdr->sh_link, 4020 sym->st_name); 4021 if (sym_name == NULL) 4022 return false; 4023 if (*sym_name == '\0') 4024 sym_name = bfd_section_name (input_bfd, sym_sec); 4025 } 4026 4027 howto = elf_hppa_howto_table + r_type; 4028 4029 if (r == bfd_reloc_undefined || r == bfd_reloc_notsupported) 4030 { 4031 (*_bfd_error_handler) 4032 (_("%s(%s+0x%lx): cannot handle %s for %s"), 4033 bfd_get_filename (input_bfd), 4034 input_section->name, 4035 (long) rel->r_offset, 4036 howto->name, 4037 sym_name); 4038 } 4039 else 4040 { 4041 if (!((*info->callbacks->reloc_overflow) 4042 (info, sym_name, howto->name, (bfd_vma) 0, 4043 input_bfd, input_section, rel->r_offset))) 4044 return false; 4045 } 4046 } 4047 4048 return true; 4049 } 4050 4051 /* Comparison function for qsort to sort unwind section during a 4052 final link. */ 4053 4054 static int 4055 hppa_unwind_entry_compare (a, b) 4056 const PTR a; 4057 const PTR b; 4058 { 4059 const bfd_byte *ap, *bp; 4060 unsigned long av, bv; 4061 4062 ap = (const bfd_byte *) a; 4063 av = (unsigned long) ap[0] << 24; 4064 av |= (unsigned long) ap[1] << 16; 4065 av |= (unsigned long) ap[2] << 8; 4066 av |= (unsigned long) ap[3]; 4067 4068 bp = (const bfd_byte *) b; 4069 bv = (unsigned long) bp[0] << 24; 4070 bv |= (unsigned long) bp[1] << 16; 4071 bv |= (unsigned long) bp[2] << 8; 4072 bv |= (unsigned long) bp[3]; 4073 4074 return av < bv ? -1 : av > bv ? 1 : 0; 4075 } 4076 4077 /* Finish up dynamic symbol handling. We set the contents of various 4078 dynamic sections here. */ 4079 4080 static boolean 4081 elf32_hppa_finish_dynamic_symbol (output_bfd, info, h, sym) 4082 bfd *output_bfd; 4083 struct bfd_link_info *info; 4084 struct elf_link_hash_entry *h; 4085 Elf_Internal_Sym *sym; 4086 { 4087 struct elf32_hppa_link_hash_table *hplink; 4088 bfd *dynobj; 4089 4090 hplink = hppa_link_hash_table (info); 4091 dynobj = hplink->root.dynobj; 4092 4093 if (h->plt.offset != (bfd_vma) -1) 4094 { 4095 bfd_vma value; 4096 4097 if (h->plt.offset & 1) 4098 abort (); 4099 4100 /* This symbol has an entry in the procedure linkage table. Set 4101 it up. 4102 4103 The format of a plt entry is 4104 <funcaddr> 4105 <__gp> 4106 */ 4107 value = 0; 4108 if (h->root.type == bfd_link_hash_defined 4109 || h->root.type == bfd_link_hash_defweak) 4110 { 4111 value = h->root.u.def.value; 4112 if (h->root.u.def.section->output_section != NULL) 4113 value += (h->root.u.def.section->output_offset 4114 + h->root.u.def.section->output_section->vma); 4115 } 4116 4117 if (! ((struct elf32_hppa_link_hash_entry *) h)->pic_call) 4118 { 4119 Elf_Internal_Rela rel; 4120 4121 /* Create a dynamic IPLT relocation for this entry. */ 4122 rel.r_offset = (h->plt.offset 4123 + hplink->splt->output_offset 4124 + hplink->splt->output_section->vma); 4125 if (! ((struct elf32_hppa_link_hash_entry *) h)->plt_abs 4126 && h->dynindx != -1) 4127 { 4128 /* To support lazy linking, the function pointer is 4129 initialised to point to a special stub stored at the 4130 end of the .plt. This is not done for plt entries 4131 with a base-relative dynamic relocation. */ 4132 value = (hplink->splt->output_offset 4133 + hplink->splt->output_section->vma 4134 + hplink->splt->_raw_size 4135 - sizeof (plt_stub) 4136 + PLT_STUB_ENTRY); 4137 rel.r_info = ELF32_R_INFO (h->dynindx, R_PARISC_IPLT); 4138 rel.r_addend = 0; 4139 } 4140 else 4141 { 4142 /* This symbol has been marked to become local, and is 4143 used by a plabel so must be kept in the .plt. */ 4144 rel.r_info = ELF32_R_INFO (0, R_PARISC_IPLT); 4145 rel.r_addend = value; 4146 } 4147 4148 bfd_elf32_swap_reloca_out (hplink->splt->output_section->owner, 4149 &rel, 4150 ((Elf32_External_Rela *) 4151 hplink->srelplt->contents 4152 + hplink->srelplt->reloc_count)); 4153 hplink->srelplt->reloc_count++; 4154 } 4155 4156 bfd_put_32 (hplink->splt->owner, 4157 value, 4158 hplink->splt->contents + h->plt.offset); 4159 bfd_put_32 (hplink->splt->owner, 4160 elf_gp (hplink->splt->output_section->owner), 4161 hplink->splt->contents + h->plt.offset + 4); 4162 if (PLABEL_PLT_ENTRY_SIZE != PLT_ENTRY_SIZE 4163 && ((struct elf32_hppa_link_hash_entry *) h)->plabel 4164 && h->dynindx != -1) 4165 { 4166 memset (hplink->splt->contents + h->plt.offset + 8, 4167 0, PLABEL_PLT_ENTRY_SIZE - PLT_ENTRY_SIZE); 4168 } 4169 4170 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) 4171 { 4172 /* Mark the symbol as undefined, rather than as defined in 4173 the .plt section. Leave the value alone. */ 4174 sym->st_shndx = SHN_UNDEF; 4175 } 4176 } 4177 4178 if (h->got.offset != (bfd_vma) -1) 4179 { 4180 Elf_Internal_Rela rel; 4181 4182 /* This symbol has an entry in the global offset table. Set it 4183 up. */ 4184 4185 rel.r_offset = ((h->got.offset &~ (bfd_vma) 1) 4186 + hplink->sgot->output_offset 4187 + hplink->sgot->output_section->vma); 4188 4189 /* If this is a -Bsymbolic link and the symbol is defined 4190 locally or was forced to be local because of a version file, 4191 we just want to emit a RELATIVE reloc. The entry in the 4192 global offset table will already have been initialized in the 4193 relocate_section function. */ 4194 if (info->shared 4195 && (info->symbolic || h->dynindx == -1) 4196 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) 4197 { 4198 rel.r_info = ELF32_R_INFO (0, R_PARISC_DIR32); 4199 rel.r_addend = (h->root.u.def.value 4200 + h->root.u.def.section->output_offset 4201 + h->root.u.def.section->output_section->vma); 4202 } 4203 else 4204 { 4205 if ((h->got.offset & 1) != 0) 4206 abort (); 4207 bfd_put_32 (output_bfd, (bfd_vma) 0, 4208 hplink->sgot->contents + h->got.offset); 4209 rel.r_info = ELF32_R_INFO (h->dynindx, R_PARISC_DIR32); 4210 rel.r_addend = 0; 4211 } 4212 4213 bfd_elf32_swap_reloca_out (output_bfd, &rel, 4214 ((Elf32_External_Rela *) 4215 hplink->srelgot->contents 4216 + hplink->srelgot->reloc_count)); 4217 ++hplink->srelgot->reloc_count; 4218 } 4219 4220 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) 4221 { 4222 asection *s; 4223 Elf_Internal_Rela rel; 4224 4225 /* This symbol needs a copy reloc. Set it up. */ 4226 4227 if (! (h->dynindx != -1 4228 && (h->root.type == bfd_link_hash_defined 4229 || h->root.type == bfd_link_hash_defweak))) 4230 abort (); 4231 4232 s = hplink->srelbss; 4233 4234 rel.r_offset = (h->root.u.def.value 4235 + h->root.u.def.section->output_offset 4236 + h->root.u.def.section->output_section->vma); 4237 rel.r_addend = 0; 4238 rel.r_info = ELF32_R_INFO (h->dynindx, R_PARISC_COPY); 4239 bfd_elf32_swap_reloca_out (output_bfd, &rel, 4240 ((Elf32_External_Rela *) s->contents 4241 + s->reloc_count)); 4242 ++s->reloc_count; 4243 } 4244 4245 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 4246 if (h->root.root.string[0] == '_' 4247 && (strcmp (h->root.root.string, "_DYNAMIC") == 0 4248 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)) 4249 { 4250 sym->st_shndx = SHN_ABS; 4251 } 4252 4253 return true; 4254 } 4255 4256 /* Finish up the dynamic sections. */ 4257 4258 static boolean 4259 elf32_hppa_finish_dynamic_sections (output_bfd, info) 4260 bfd *output_bfd; 4261 struct bfd_link_info *info; 4262 { 4263 bfd *dynobj; 4264 struct elf32_hppa_link_hash_table *hplink; 4265 asection *sdyn; 4266 4267 hplink = hppa_link_hash_table (info); 4268 dynobj = hplink->root.dynobj; 4269 4270 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 4271 4272 if (hplink->root.dynamic_sections_created) 4273 { 4274 Elf32_External_Dyn *dyncon, *dynconend; 4275 4276 if (sdyn == NULL) 4277 abort (); 4278 4279 dyncon = (Elf32_External_Dyn *) sdyn->contents; 4280 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); 4281 for (; dyncon < dynconend; dyncon++) 4282 { 4283 Elf_Internal_Dyn dyn; 4284 asection *s; 4285 4286 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 4287 4288 switch (dyn.d_tag) 4289 { 4290 default: 4291 break; 4292 4293 case DT_PLTGOT: 4294 /* Use PLTGOT to set the GOT register. */ 4295 dyn.d_un.d_ptr = elf_gp (output_bfd); 4296 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4297 break; 4298 4299 case DT_JMPREL: 4300 s = hplink->srelplt; 4301 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 4302 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4303 break; 4304 4305 case DT_PLTRELSZ: 4306 s = hplink->srelplt; 4307 if (s->_cooked_size != 0) 4308 dyn.d_un.d_val = s->_cooked_size; 4309 else 4310 dyn.d_un.d_val = s->_raw_size; 4311 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4312 break; 4313 } 4314 } 4315 } 4316 4317 if (hplink->sgot->_raw_size != 0) 4318 { 4319 /* Fill in the first entry in the global offset table. 4320 We use it to point to our dynamic section, if we have one. */ 4321 bfd_put_32 (output_bfd, 4322 (sdyn != NULL 4323 ? sdyn->output_section->vma + sdyn->output_offset 4324 : (bfd_vma) 0), 4325 hplink->sgot->contents); 4326 4327 /* The second entry is reserved for use by the dynamic linker. */ 4328 memset (hplink->sgot->contents + GOT_ENTRY_SIZE, 0, GOT_ENTRY_SIZE); 4329 4330 /* Set .got entry size. */ 4331 elf_section_data (hplink->sgot->output_section) 4332 ->this_hdr.sh_entsize = GOT_ENTRY_SIZE; 4333 } 4334 4335 if (hplink->splt->_raw_size != 0) 4336 { 4337 /* Set plt entry size. */ 4338 elf_section_data (hplink->splt->output_section) 4339 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE; 4340 4341 if (hplink->need_plt_stub) 4342 { 4343 /* Set up the .plt stub. */ 4344 memcpy (hplink->splt->contents 4345 + hplink->splt->_raw_size - sizeof (plt_stub), 4346 plt_stub, sizeof (plt_stub)); 4347 4348 if ((hplink->splt->output_offset 4349 + hplink->splt->output_section->vma 4350 + hplink->splt->_raw_size) 4351 != (hplink->sgot->output_offset 4352 + hplink->sgot->output_section->vma)) 4353 { 4354 (*_bfd_error_handler) 4355 (_(".got section not immediately after .plt section")); 4356 return false; 4357 } 4358 } 4359 } 4360 4361 return true; 4362 } 4363 4364 /* Tweak the OSABI field of the elf header. */ 4365 4366 static void 4367 elf32_hppa_post_process_headers (abfd, link_info) 4368 bfd *abfd; 4369 struct bfd_link_info *link_info ATTRIBUTE_UNUSED; 4370 { 4371 Elf_Internal_Ehdr * i_ehdrp; 4372 4373 i_ehdrp = elf_elfheader (abfd); 4374 4375 if (strcmp (bfd_get_target (abfd), "elf32-hppa-linux") == 0) 4376 { 4377 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_LINUX; 4378 } 4379 else 4380 { 4381 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_HPUX; 4382 } 4383 } 4384 4385 /* Called when writing out an object file to decide the type of a 4386 symbol. */ 4387 static int 4388 elf32_hppa_elf_get_symbol_type (elf_sym, type) 4389 Elf_Internal_Sym *elf_sym; 4390 int type; 4391 { 4392 if (ELF_ST_TYPE (elf_sym->st_info) == STT_PARISC_MILLI) 4393 return STT_PARISC_MILLI; 4394 else 4395 return type; 4396 } 4397 4398 /* Misc BFD support code. */ 4399 #define bfd_elf32_bfd_is_local_label_name elf_hppa_is_local_label_name 4400 #define bfd_elf32_bfd_reloc_type_lookup elf_hppa_reloc_type_lookup 4401 #define elf_info_to_howto elf_hppa_info_to_howto 4402 #define elf_info_to_howto_rel elf_hppa_info_to_howto_rel 4403 4404 /* Stuff for the BFD linker. */ 4405 #define bfd_elf32_bfd_final_link elf32_hppa_final_link 4406 #define bfd_elf32_bfd_link_hash_table_create elf32_hppa_link_hash_table_create 4407 #define elf_backend_add_symbol_hook elf32_hppa_add_symbol_hook 4408 #define elf_backend_adjust_dynamic_symbol elf32_hppa_adjust_dynamic_symbol 4409 #define elf_backend_check_relocs elf32_hppa_check_relocs 4410 #define elf_backend_create_dynamic_sections elf32_hppa_create_dynamic_sections 4411 #define elf_backend_fake_sections elf_hppa_fake_sections 4412 #define elf_backend_relocate_section elf32_hppa_relocate_section 4413 #define elf_backend_hide_symbol elf32_hppa_hide_symbol 4414 #define elf_backend_finish_dynamic_symbol elf32_hppa_finish_dynamic_symbol 4415 #define elf_backend_finish_dynamic_sections elf32_hppa_finish_dynamic_sections 4416 #define elf_backend_size_dynamic_sections elf32_hppa_size_dynamic_sections 4417 #define elf_backend_gc_mark_hook elf32_hppa_gc_mark_hook 4418 #define elf_backend_gc_sweep_hook elf32_hppa_gc_sweep_hook 4419 #define elf_backend_object_p elf32_hppa_object_p 4420 #define elf_backend_final_write_processing elf_hppa_final_write_processing 4421 #define elf_backend_post_process_headers elf32_hppa_post_process_headers 4422 #define elf_backend_get_symbol_type elf32_hppa_elf_get_symbol_type 4423 4424 #define elf_backend_can_gc_sections 1 4425 #define elf_backend_plt_alignment 2 4426 #define elf_backend_want_got_plt 0 4427 #define elf_backend_plt_readonly 0 4428 #define elf_backend_want_plt_sym 0 4429 #define elf_backend_got_header_size 8 4430 4431 #define TARGET_BIG_SYM bfd_elf32_hppa_vec 4432 #define TARGET_BIG_NAME "elf32-hppa" 4433 #define ELF_ARCH bfd_arch_hppa 4434 #define ELF_MACHINE_CODE EM_PARISC 4435 #define ELF_MAXPAGESIZE 0x1000 4436 4437 #include "elf32-target.h" 4438 4439 #undef TARGET_BIG_SYM 4440 #define TARGET_BIG_SYM bfd_elf32_hppa_linux_vec 4441 #undef TARGET_BIG_NAME 4442 #define TARGET_BIG_NAME "elf32-hppa-linux" 4443 4444 #define INCLUDED_TARGET_FILE 1 4445 #include "elf32-target.h" 4446