1 // powerpc.cc -- powerpc target support for gold.
3 // Copyright 2008, 2009 Free Software Foundation, Inc.
4 // Written by David S. Miller <davem@davemloft.net>
5 // and David Edelsohn <edelsohn@gnu.org>
7 // This file is part of gold.
9 // This program is free software; you can redistribute it and/or modify
10 // it under the terms of the GNU General Public License as published by
11 // the Free Software Foundation; either version 3 of the License, or
12 // (at your option) any later version.
14 // This program is distributed in the hope that it will be useful,
15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 // GNU General Public License for more details.
19 // You should have received a copy of the GNU General Public License
20 // along with this program; if not, write to the Free Software
21 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 // MA 02110-1301, USA.
27 #include "parameters.h"
34 #include "copy-relocs.h"
36 #include "target-reloc.h"
37 #include "target-select.h"
47 template<int size, bool big_endian>
48 class Output_data_plt_powerpc;
50 template<int size, bool big_endian>
51 class Target_powerpc : public Sized_target<size, big_endian>
54 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Reloc_section;
57 : Sized_target<size, big_endian>(&powerpc_info),
58 got_(NULL), got2_(NULL), toc_(NULL),
59 plt_(NULL), rela_dyn_(NULL),
60 copy_relocs_(elfcpp::R_POWERPC_COPY),
61 dynbss_(NULL), got_mod_index_offset_(-1U)
65 // Process the relocations to determine unreferenced sections for
66 // garbage collection.
68 gc_process_relocs(Symbol_table* symtab,
70 Sized_relobj<size, big_endian>* object,
71 unsigned int data_shndx,
73 const unsigned char* prelocs,
75 Output_section* output_section,
76 bool needs_special_offset_handling,
77 size_t local_symbol_count,
78 const unsigned char* plocal_symbols);
80 // Scan the relocations to look for symbol adjustments.
82 scan_relocs(Symbol_table* symtab,
84 Sized_relobj<size, big_endian>* object,
85 unsigned int data_shndx,
87 const unsigned char* prelocs,
89 Output_section* output_section,
90 bool needs_special_offset_handling,
91 size_t local_symbol_count,
92 const unsigned char* plocal_symbols);
93 // Finalize the sections.
95 do_finalize_sections(Layout*);
97 // Return the value to use for a dynamic which requires special
100 do_dynsym_value(const Symbol*) const;
102 // Relocate a section.
104 relocate_section(const Relocate_info<size, big_endian>*,
105 unsigned int sh_type,
106 const unsigned char* prelocs,
108 Output_section* output_section,
109 bool needs_special_offset_handling,
111 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
112 section_size_type view_size,
113 const Reloc_symbol_changes*);
115 // Scan the relocs during a relocatable link.
117 scan_relocatable_relocs(Symbol_table* symtab,
119 Sized_relobj<size, big_endian>* object,
120 unsigned int data_shndx,
121 unsigned int sh_type,
122 const unsigned char* prelocs,
124 Output_section* output_section,
125 bool needs_special_offset_handling,
126 size_t local_symbol_count,
127 const unsigned char* plocal_symbols,
128 Relocatable_relocs*);
130 // Relocate a section during a relocatable link.
132 relocate_for_relocatable(const Relocate_info<size, big_endian>*,
133 unsigned int sh_type,
134 const unsigned char* prelocs,
136 Output_section* output_section,
137 off_t offset_in_output_section,
138 const Relocatable_relocs*,
140 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
141 section_size_type view_size,
142 unsigned char* reloc_view,
143 section_size_type reloc_view_size);
145 // Return whether SYM is defined by the ABI.
147 do_is_defined_by_abi(const Symbol* sym) const
149 return strcmp(sym->name(), "___tls_get_addr") == 0;
152 // Return the size of the GOT section.
156 gold_assert(this->got_ != NULL);
157 return this->got_->data_size();
162 // The class which scans relocations.
167 : issued_non_pic_error_(false)
171 local(Symbol_table* symtab, Layout* layout, Target_powerpc* target,
172 Sized_relobj<size, big_endian>* object,
173 unsigned int data_shndx,
174 Output_section* output_section,
175 const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
176 const elfcpp::Sym<size, big_endian>& lsym);
179 global(Symbol_table* symtab, Layout* layout, Target_powerpc* target,
180 Sized_relobj<size, big_endian>* object,
181 unsigned int data_shndx,
182 Output_section* output_section,
183 const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
188 unsupported_reloc_local(Sized_relobj<size, big_endian>*,
189 unsigned int r_type);
192 unsupported_reloc_global(Sized_relobj<size, big_endian>*,
193 unsigned int r_type, Symbol*);
196 generate_tls_call(Symbol_table* symtab, Layout* layout,
197 Target_powerpc* target);
200 check_non_pic(Relobj*, unsigned int r_type);
202 // Whether we have issued an error about a non-PIC compilation.
203 bool issued_non_pic_error_;
206 // The class which implements relocation.
210 // Do a relocation. Return false if the caller should not issue
211 // any warnings about this relocation.
213 relocate(const Relocate_info<size, big_endian>*, Target_powerpc*,
214 Output_section*, size_t relnum,
215 const elfcpp::Rela<size, big_endian>&,
216 unsigned int r_type, const Sized_symbol<size>*,
217 const Symbol_value<size>*,
219 typename elfcpp::Elf_types<size>::Elf_Addr,
223 // Do a TLS relocation.
225 relocate_tls(const Relocate_info<size, big_endian>*,
226 Target_powerpc* target,
227 size_t relnum, const elfcpp::Rela<size, big_endian>&,
228 unsigned int r_type, const Sized_symbol<size>*,
229 const Symbol_value<size>*,
231 typename elfcpp::Elf_types<size>::Elf_Addr,
235 // A class which returns the size required for a relocation type,
236 // used while scanning relocs during a relocatable link.
237 class Relocatable_size_for_reloc
241 get_size_for_reloc(unsigned int, Relobj*);
244 // Get the GOT section, creating it if necessary.
245 Output_data_got<size, big_endian>*
246 got_section(Symbol_table*, Layout*);
251 gold_assert (this->got2_ != NULL);
255 // Get the TOC section.
259 gold_assert (this->toc_ != NULL);
263 // Create a PLT entry for a global symbol.
265 make_plt_entry(Symbol_table*, Layout*, Symbol*);
267 // Create a GOT entry for the TLS module index.
269 got_mod_index_entry(Symbol_table* symtab, Layout* layout,
270 Sized_relobj<size, big_endian>* object);
272 // Get the PLT section.
273 const Output_data_plt_powerpc<size, big_endian>*
276 gold_assert(this->plt_ != NULL);
280 // Get the dynamic reloc section, creating it if necessary.
282 rela_dyn_section(Layout*);
284 // Copy a relocation against a global symbol.
286 copy_reloc(Symbol_table* symtab, Layout* layout,
287 Sized_relobj<size, big_endian>* object,
288 unsigned int shndx, Output_section* output_section,
289 Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc)
291 this->copy_relocs_.copy_reloc(symtab, layout,
292 symtab->get_sized_symbol<size>(sym),
293 object, shndx, output_section,
294 reloc, this->rela_dyn_section(layout));
297 // Information about this specific target which we pass to the
298 // general Target structure.
299 static Target::Target_info powerpc_info;
301 // The types of GOT entries needed for this platform.
304 GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol
305 GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset
306 GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair
310 Output_data_got<size, big_endian>* got_;
312 Output_data_space* got2_;
314 Output_data_space* toc_;
316 Output_data_plt_powerpc<size, big_endian>* plt_;
317 // The dynamic reloc section.
318 Reloc_section* rela_dyn_;
319 // Relocs saved to avoid a COPY reloc.
320 Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_;
321 // Space for variables copied with a COPY reloc.
322 Output_data_space* dynbss_;
323 // Offset of the GOT entry for the TLS module index;
324 unsigned int got_mod_index_offset_;
328 Target::Target_info Target_powerpc<32, true>::powerpc_info =
331 true, // is_big_endian
332 elfcpp::EM_PPC, // machine_code
333 false, // has_make_symbol
334 false, // has_resolve
335 false, // has_code_fill
336 true, // is_default_stack_executable
338 "/usr/lib/ld.so.1", // dynamic_linker
339 0x10000000, // default_text_segment_address
340 64 * 1024, // abi_pagesize (overridable by -z max-page-size)
341 4 * 1024, // common_pagesize (overridable by -z common-page-size)
342 elfcpp::SHN_UNDEF, // small_common_shndx
343 elfcpp::SHN_UNDEF, // large_common_shndx
344 0, // small_common_section_flags
345 0 // large_common_section_flags
349 Target::Target_info Target_powerpc<32, false>::powerpc_info =
352 false, // is_big_endian
353 elfcpp::EM_PPC, // machine_code
354 false, // has_make_symbol
355 false, // has_resolve
356 false, // has_code_fill
357 true, // is_default_stack_executable
359 "/usr/lib/ld.so.1", // dynamic_linker
360 0x10000000, // default_text_segment_address
361 64 * 1024, // abi_pagesize (overridable by -z max-page-size)
362 4 * 1024, // common_pagesize (overridable by -z common-page-size)
363 elfcpp::SHN_UNDEF, // small_common_shndx
364 elfcpp::SHN_UNDEF, // large_common_shndx
365 0, // small_common_section_flags
366 0 // large_common_section_flags
370 Target::Target_info Target_powerpc<64, true>::powerpc_info =
373 true, // is_big_endian
374 elfcpp::EM_PPC64, // machine_code
375 false, // has_make_symbol
376 false, // has_resolve
377 false, // has_code_fill
378 true, // is_default_stack_executable
380 "/usr/lib/ld.so.1", // dynamic_linker
381 0x10000000, // default_text_segment_address
382 64 * 1024, // abi_pagesize (overridable by -z max-page-size)
383 8 * 1024, // common_pagesize (overridable by -z common-page-size)
384 elfcpp::SHN_UNDEF, // small_common_shndx
385 elfcpp::SHN_UNDEF, // large_common_shndx
386 0, // small_common_section_flags
387 0 // large_common_section_flags
391 Target::Target_info Target_powerpc<64, false>::powerpc_info =
394 false, // is_big_endian
395 elfcpp::EM_PPC64, // machine_code
396 false, // has_make_symbol
397 false, // has_resolve
398 false, // has_code_fill
399 true, // is_default_stack_executable
401 "/usr/lib/ld.so.1", // dynamic_linker
402 0x10000000, // default_text_segment_address
403 64 * 1024, // abi_pagesize (overridable by -z max-page-size)
404 8 * 1024, // common_pagesize (overridable by -z common-page-size)
405 elfcpp::SHN_UNDEF, // small_common_shndx
406 elfcpp::SHN_UNDEF, // large_common_shndx
407 0, // small_common_section_flags
408 0 // large_common_section_flags
411 template<int size, bool big_endian>
412 class Powerpc_relocate_functions
415 // Do a simple relocation with the addend in the relocation.
416 template<int valsize>
418 rela(unsigned char* view,
419 unsigned int right_shift,
420 elfcpp::Elf_Xword dst_mask,
421 typename elfcpp::Swap<size, big_endian>::Valtype value,
422 typename elfcpp::Swap<size, big_endian>::Valtype addend)
424 typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
425 Valtype* wv = reinterpret_cast<Valtype*>(view);
426 Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
427 Valtype reloc = ((value + addend) >> right_shift);
432 elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc);
435 // Do a simple relocation using a symbol value with the addend in
437 template<int valsize>
439 rela(unsigned char* view,
440 unsigned int right_shift,
441 elfcpp::Elf_Xword dst_mask,
442 const Sized_relobj<size, big_endian>* object,
443 const Symbol_value<size>* psymval,
444 typename elfcpp::Swap<valsize, big_endian>::Valtype addend)
446 typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
447 Valtype* wv = reinterpret_cast<Valtype*>(view);
448 Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
449 Valtype reloc = (psymval->value(object, addend) >> right_shift);
454 elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc);
457 // Do a simple relocation using a symbol value with the addend in
458 // the relocation, unaligned.
459 template<int valsize>
461 rela_ua(unsigned char* view, unsigned int right_shift,
462 elfcpp::Elf_Xword dst_mask,
463 const Sized_relobj<size, big_endian>* object,
464 const Symbol_value<size>* psymval,
465 typename elfcpp::Swap<size, big_endian>::Valtype addend)
467 typedef typename elfcpp::Swap_unaligned<valsize,
468 big_endian>::Valtype Valtype;
469 unsigned char* wv = view;
470 Valtype val = elfcpp::Swap_unaligned<valsize, big_endian>::readval(wv);
471 Valtype reloc = (psymval->value(object, addend) >> right_shift);
476 elfcpp::Swap_unaligned<valsize, big_endian>::writeval(wv, val | reloc);
479 // Do a simple PC relative relocation with a Symbol_value with the
480 // addend in the relocation.
481 template<int valsize>
483 pcrela(unsigned char* view, unsigned int right_shift,
484 elfcpp::Elf_Xword dst_mask,
485 const Sized_relobj<size, big_endian>* object,
486 const Symbol_value<size>* psymval,
487 typename elfcpp::Swap<size, big_endian>::Valtype addend,
488 typename elfcpp::Elf_types<size>::Elf_Addr address)
490 typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
491 Valtype* wv = reinterpret_cast<Valtype*>(view);
492 Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
493 Valtype reloc = ((psymval->value(object, addend) - address)
499 elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc);
502 template<int valsize>
504 pcrela_unaligned(unsigned char* view,
505 const Sized_relobj<size, big_endian>* object,
506 const Symbol_value<size>* psymval,
507 typename elfcpp::Swap<size, big_endian>::Valtype addend,
508 typename elfcpp::Elf_types<size>::Elf_Addr address)
510 typedef typename elfcpp::Swap_unaligned<valsize,
511 big_endian>::Valtype Valtype;
512 unsigned char* wv = view;
513 Valtype reloc = (psymval->value(object, addend) - address);
515 elfcpp::Swap_unaligned<valsize, big_endian>::writeval(wv, reloc);
518 typedef Powerpc_relocate_functions<size, big_endian> This;
519 typedef Relocate_functions<size, big_endian> This_reloc;
521 // R_POWERPC_REL32: (Symbol + Addend - Address)
523 rel32(unsigned char* view,
524 const Sized_relobj<size, big_endian>* object,
525 const Symbol_value<size>* psymval,
526 typename elfcpp::Elf_types<size>::Elf_Addr addend,
527 typename elfcpp::Elf_types<size>::Elf_Addr address)
528 { This_reloc::pcrela32(view, object, psymval, addend, address); }
530 // R_POWERPC_REL24: (Symbol + Addend - Address) & 0x3fffffc
532 rel24(unsigned char* view,
533 const Sized_relobj<size, big_endian>* object,
534 const Symbol_value<size>* psymval,
535 typename elfcpp::Elf_types<size>::Elf_Addr addend,
536 typename elfcpp::Elf_types<size>::Elf_Addr address)
538 This::template pcrela<32>(view, 0, 0x03fffffc, object,
539 psymval, addend, address);
542 // R_POWERPC_REL14: (Symbol + Addend - Address) & 0xfffc
544 rel14(unsigned char* view,
545 const Sized_relobj<size, big_endian>* object,
546 const Symbol_value<size>* psymval,
547 typename elfcpp::Elf_types<size>::Elf_Addr addend,
548 typename elfcpp::Elf_types<size>::Elf_Addr address)
550 This::template pcrela<32>(view, 0, 0x0000fffc, object,
551 psymval, addend, address);
554 // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff
556 addr16(unsigned char* view,
557 typename elfcpp::Elf_types<size>::Elf_Addr value,
558 typename elfcpp::Elf_types<size>::Elf_Addr addend)
559 { This_reloc::rela16(view, value, addend); }
562 addr16(unsigned char* view,
563 const Sized_relobj<size, big_endian>* object,
564 const Symbol_value<size>* psymval,
565 typename elfcpp::Elf_types<size>::Elf_Addr addend)
566 { This_reloc::rela16(view, object, psymval, addend); }
568 // R_POWERPC_ADDR16_DS: (Symbol + Addend) & 0xfffc
570 addr16_ds(unsigned char* view,
571 typename elfcpp::Elf_types<size>::Elf_Addr value,
572 typename elfcpp::Elf_types<size>::Elf_Addr addend)
574 This::template rela<16>(view, 0, 0xfffc, value, addend);
577 // R_POWERPC_ADDR16_LO: (Symbol + Addend) & 0xffff
579 addr16_lo(unsigned char* view,
580 typename elfcpp::Elf_types<size>::Elf_Addr value,
581 typename elfcpp::Elf_types<size>::Elf_Addr addend)
582 { This_reloc::rela16(view, value, addend); }
585 addr16_lo(unsigned char* view,
586 const Sized_relobj<size, big_endian>* object,
587 const Symbol_value<size>* psymval,
588 typename elfcpp::Elf_types<size>::Elf_Addr addend)
589 { This_reloc::rela16(view, object, psymval, addend); }
591 // R_POWERPC_ADDR16_HI: ((Symbol + Addend) >> 16) & 0xffff
593 addr16_hi(unsigned char* view,
594 typename elfcpp::Elf_types<size>::Elf_Addr value,
595 typename elfcpp::Elf_types<size>::Elf_Addr addend)
597 This::template rela<16>(view, 16, 0xffff, value, addend);
601 addr16_hi(unsigned char* view,
602 const Sized_relobj<size, big_endian>* object,
603 const Symbol_value<size>* psymval,
604 typename elfcpp::Elf_types<size>::Elf_Addr addend)
606 This::template rela<16>(view, 16, 0xffff, object, psymval, addend);
609 // R_POWERPC_ADDR16_HA: Same as R_POWERPC_ADDR16_HI except that if the
610 // final value of the low 16 bits of the
611 // relocation is negative, add one.
613 addr16_ha(unsigned char* view,
614 typename elfcpp::Elf_types<size>::Elf_Addr value,
615 typename elfcpp::Elf_types<size>::Elf_Addr addend)
617 typename elfcpp::Elf_types<size>::Elf_Addr reloc;
619 reloc = value + addend;
625 elfcpp::Swap<16, big_endian>::writeval(view, reloc);
629 addr16_ha(unsigned char* view,
630 const Sized_relobj<size, big_endian>* object,
631 const Symbol_value<size>* psymval,
632 typename elfcpp::Elf_types<size>::Elf_Addr addend)
634 typename elfcpp::Elf_types<size>::Elf_Addr reloc;
636 reloc = psymval->value(object, addend);
642 elfcpp::Swap<16, big_endian>::writeval(view, reloc);
645 // R_PPC_REL16: (Symbol + Addend - Address) & 0xffff
647 rel16(unsigned char* view,
648 const Sized_relobj<size, big_endian>* object,
649 const Symbol_value<size>* psymval,
650 typename elfcpp::Elf_types<size>::Elf_Addr addend,
651 typename elfcpp::Elf_types<size>::Elf_Addr address)
652 { This_reloc::pcrela16(view, object, psymval, addend, address); }
654 // R_PPC_REL16_LO: (Symbol + Addend - Address) & 0xffff
656 rel16_lo(unsigned char* view,
657 const Sized_relobj<size, big_endian>* object,
658 const Symbol_value<size>* psymval,
659 typename elfcpp::Elf_types<size>::Elf_Addr addend,
660 typename elfcpp::Elf_types<size>::Elf_Addr address)
661 { This_reloc::pcrela16(view, object, psymval, addend, address); }
663 // R_PPC_REL16_HI: ((Symbol + Addend - Address) >> 16) & 0xffff
665 rel16_hi(unsigned char* view,
666 const Sized_relobj<size, big_endian>* object,
667 const Symbol_value<size>* psymval,
668 typename elfcpp::Elf_types<size>::Elf_Addr addend,
669 typename elfcpp::Elf_types<size>::Elf_Addr address)
671 This::template pcrela<16>(view, 16, 0xffff, object,
672 psymval, addend, address);
675 // R_PPC_REL16_HA: Same as R_PPC_REL16_HI except that if the
676 // final value of the low 16 bits of the
677 // relocation is negative, add one.
679 rel16_ha(unsigned char* view,
680 const Sized_relobj<size, big_endian>* object,
681 const Symbol_value<size>* psymval,
682 typename elfcpp::Elf_types<size>::Elf_Addr addend,
683 typename elfcpp::Elf_types<size>::Elf_Addr address)
685 typename elfcpp::Elf_types<size>::Elf_Addr reloc;
687 reloc = (psymval->value(object, addend) - address);
692 elfcpp::Swap<16, big_endian>::writeval(view, reloc);
696 // Get the GOT section, creating it if necessary.
698 template<int size, bool big_endian>
699 Output_data_got<size, big_endian>*
700 Target_powerpc<size, big_endian>::got_section(Symbol_table* symtab,
703 if (this->got_ == NULL)
705 gold_assert(symtab != NULL && layout != NULL);
707 this->got_ = new Output_data_got<size, big_endian>();
709 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
710 elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
713 // Create the GOT2 or TOC in the .got section.
716 this->got2_ = new Output_data_space(4, "** GOT2");
717 layout->add_output_section_data(".got2", elfcpp::SHT_PROGBITS,
724 this->toc_ = new Output_data_space(8, "** TOC");
725 layout->add_output_section_data(".toc", elfcpp::SHT_PROGBITS,
731 // Define _GLOBAL_OFFSET_TABLE_ at the start of the .got section.
732 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
734 0, 0, elfcpp::STT_OBJECT,
736 elfcpp::STV_HIDDEN, 0,
743 // Get the dynamic reloc section, creating it if necessary.
745 template<int size, bool big_endian>
746 typename Target_powerpc<size, big_endian>::Reloc_section*
747 Target_powerpc<size, big_endian>::rela_dyn_section(Layout* layout)
749 if (this->rela_dyn_ == NULL)
751 gold_assert(layout != NULL);
752 this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
753 layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
754 elfcpp::SHF_ALLOC, this->rela_dyn_);
756 return this->rela_dyn_;
759 // A class to handle the PLT data.
761 template<int size, bool big_endian>
762 class Output_data_plt_powerpc : public Output_section_data
765 typedef Output_data_reloc<elfcpp::SHT_RELA, true,
766 size, big_endian> Reloc_section;
768 Output_data_plt_powerpc(Layout*);
770 // Add an entry to the PLT.
771 void add_entry(Symbol* gsym);
773 // Return the .rela.plt section data.
774 const Reloc_section* rel_plt() const
780 void do_adjust_output_section(Output_section* os);
783 // The size of an entry in the PLT.
784 static const int base_plt_entry_size = (size == 32 ? 16 : 24);
786 // Set the final size.
788 set_final_data_size()
790 unsigned int full_count = this->count_ + 4;
792 this->set_data_size(full_count * base_plt_entry_size);
795 // Write out the PLT data.
797 do_write(Output_file*);
799 // The reloc section.
801 // The number of PLT entries.
805 // Create the PLT section. The ordinary .got section is an argument,
806 // since we need to refer to the start.
808 template<int size, bool big_endian>
809 Output_data_plt_powerpc<size, big_endian>::Output_data_plt_powerpc(Layout* layout)
810 : Output_section_data(size == 32 ? 4 : 8), count_(0)
812 this->rel_ = new Reloc_section(false);
813 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
814 elfcpp::SHF_ALLOC, this->rel_);
817 template<int size, bool big_endian>
819 Output_data_plt_powerpc<size, big_endian>::do_adjust_output_section(Output_section* os)
824 // Add an entry to the PLT.
826 template<int size, bool big_endian>
828 Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym)
830 gold_assert(!gsym->has_plt_offset());
831 unsigned int index = this->count_+ + 4;
832 section_offset_type plt_offset;
835 plt_offset = index * base_plt_entry_size;
839 gsym->set_plt_offset(plt_offset);
843 gsym->set_needs_dynsym_entry();
844 this->rel_->add_global(gsym, elfcpp::R_POWERPC_JMP_SLOT, this,
848 static const unsigned int addis_11_11 = 0x3d6b0000;
849 static const unsigned int addis_11_30 = 0x3d7e0000;
850 static const unsigned int addis_12_12 = 0x3d8c0000;
851 static const unsigned int addi_11_11 = 0x396b0000;
852 static const unsigned int add_0_11_11 = 0x7c0b5a14;
853 static const unsigned int add_11_0_11 = 0x7d605a14;
854 static const unsigned int b = 0x48000000;
855 static const unsigned int bcl_20_31 = 0x429f0005;
856 static const unsigned int bctr = 0x4e800420;
857 static const unsigned int lis_11 = 0x3d600000;
858 static const unsigned int lis_12 = 0x3d800000;
859 static const unsigned int lwzu_0_12 = 0x840c0000;
860 static const unsigned int lwz_0_12 = 0x800c0000;
861 static const unsigned int lwz_11_11 = 0x816b0000;
862 static const unsigned int lwz_11_30 = 0x817e0000;
863 static const unsigned int lwz_12_12 = 0x818c0000;
864 static const unsigned int mflr_0 = 0x7c0802a6;
865 static const unsigned int mflr_12 = 0x7d8802a6;
866 static const unsigned int mtctr_0 = 0x7c0903a6;
867 static const unsigned int mtctr_11 = 0x7d6903a6;
868 static const unsigned int mtlr_0 = 0x7c0803a6;
869 static const unsigned int nop = 0x60000000;
870 static const unsigned int sub_11_11_12 = 0x7d6c5850;
872 static const unsigned int addis_r12_r2 = 0x3d820000; /* addis %r12,%r2,xxx@ha */
873 static const unsigned int std_r2_40r1 = 0xf8410028; /* std %r2,40(%r1) */
874 static const unsigned int ld_r11_0r12 = 0xe96c0000; /* ld %r11,xxx+0@l(%r12) */
875 static const unsigned int ld_r2_0r12 = 0xe84c0000; /* ld %r2,xxx+8@l(%r12) */
876 /* ld %r11,xxx+16@l(%r12) */
879 // Write out the PLT.
881 template<int size, bool big_endian>
883 Output_data_plt_powerpc<size, big_endian>::do_write(Output_file* of)
885 const off_t offset = this->offset();
886 const section_size_type oview_size =
887 convert_to_section_size_type(this->data_size());
888 unsigned char* const oview = of->get_output_view(offset, oview_size);
889 unsigned char* pov = oview;
891 memset(pov, 0, base_plt_entry_size * 4);
892 pov += base_plt_entry_size * 4;
894 unsigned int plt_offset = base_plt_entry_size * 4;
895 const unsigned int count = this->count_;
899 for (unsigned int i = 0; i < count; i++)
905 for (unsigned int i = 0; i < count; i++)
907 elfcpp::Swap<32, true>::writeval(pov + 0x00,
908 lwz_11_30 + plt_offset);
909 elfcpp::Swap<32, true>::writeval(pov + 0x04, mtctr_11);
910 elfcpp::Swap<32, true>::writeval(pov + 0x08, bctr);
911 elfcpp::Swap<32, true>::writeval(pov + 0x0c, nop);
912 pov += base_plt_entry_size;
913 plt_offset += base_plt_entry_size;
917 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
919 of->write_output_view(offset, oview_size, oview);
922 // Create a PLT entry for a global symbol.
924 template<int size, bool big_endian>
926 Target_powerpc<size, big_endian>::make_plt_entry(Symbol_table* symtab,
930 if (gsym->has_plt_offset())
933 if (this->plt_ == NULL)
935 // Create the GOT section first.
936 this->got_section(symtab, layout);
938 this->plt_ = new Output_data_plt_powerpc<size, big_endian>(layout);
939 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
941 | elfcpp::SHF_EXECINSTR
942 | elfcpp::SHF_WRITE),
945 // Define _PROCEDURE_LINKAGE_TABLE_ at the start of the .plt section.
946 symtab->define_in_output_data("_PROCEDURE_LINKAGE_TABLE_", NULL,
948 0, 0, elfcpp::STT_OBJECT,
950 elfcpp::STV_HIDDEN, 0,
954 this->plt_->add_entry(gsym);
957 // Create a GOT entry for the TLS module index.
959 template<int size, bool big_endian>
961 Target_powerpc<size, big_endian>::got_mod_index_entry(Symbol_table* symtab,
963 Sized_relobj<size, big_endian>* object)
965 if (this->got_mod_index_offset_ == -1U)
967 gold_assert(symtab != NULL && layout != NULL && object != NULL);
968 Reloc_section* rela_dyn = this->rela_dyn_section(layout);
969 Output_data_got<size, big_endian>* got;
970 unsigned int got_offset;
972 got = this->got_section(symtab, layout);
973 got_offset = got->add_constant(0);
974 rela_dyn->add_local(object, 0, elfcpp::R_POWERPC_DTPMOD, got,
976 got->add_constant(0);
977 this->got_mod_index_offset_ = got_offset;
979 return this->got_mod_index_offset_;
982 // Optimize the TLS relocation type based on what we know about the
983 // symbol. IS_FINAL is true if the final address of this symbol is
984 // known at link time.
986 static tls::Tls_optimization
987 optimize_tls_reloc(bool /* is_final */, int r_type)
989 // If we are generating a shared library, then we can't do anything
991 if (parameters->options().shared())
992 return tls::TLSOPT_NONE;
1001 // Report an unsupported relocation against a local symbol.
1003 template<int size, bool big_endian>
1005 Target_powerpc<size, big_endian>::Scan::unsupported_reloc_local(
1006 Sized_relobj<size, big_endian>* object,
1007 unsigned int r_type)
1009 gold_error(_("%s: unsupported reloc %u against local symbol"),
1010 object->name().c_str(), r_type);
1013 // We are about to emit a dynamic relocation of type R_TYPE. If the
1014 // dynamic linker does not support it, issue an error.
1016 template<int size, bool big_endian>
1018 Target_powerpc<size, big_endian>::Scan::check_non_pic(Relobj* object,
1019 unsigned int r_type)
1021 gold_assert(r_type != elfcpp::R_POWERPC_NONE);
1023 // These are the relocation types supported by glibc for both 32-bit
1024 // and 64-bit powerpc.
1027 case elfcpp::R_POWERPC_RELATIVE:
1028 case elfcpp::R_POWERPC_GLOB_DAT:
1029 case elfcpp::R_POWERPC_DTPMOD:
1030 case elfcpp::R_POWERPC_DTPREL:
1031 case elfcpp::R_POWERPC_TPREL:
1032 case elfcpp::R_POWERPC_JMP_SLOT:
1033 case elfcpp::R_POWERPC_COPY:
1034 case elfcpp::R_POWERPC_ADDR32:
1035 case elfcpp::R_POWERPC_ADDR24:
1036 case elfcpp::R_POWERPC_REL24:
1047 // These are the relocation types supported only on 64-bit.
1048 case elfcpp::R_PPC64_ADDR64:
1049 case elfcpp::R_PPC64_TPREL16_LO_DS:
1050 case elfcpp::R_PPC64_TPREL16_DS:
1051 case elfcpp::R_POWERPC_TPREL16:
1052 case elfcpp::R_POWERPC_TPREL16_LO:
1053 case elfcpp::R_POWERPC_TPREL16_HI:
1054 case elfcpp::R_POWERPC_TPREL16_HA:
1055 case elfcpp::R_PPC64_TPREL16_HIGHER:
1056 case elfcpp::R_PPC64_TPREL16_HIGHEST:
1057 case elfcpp::R_PPC64_TPREL16_HIGHERA:
1058 case elfcpp::R_PPC64_TPREL16_HIGHESTA:
1059 case elfcpp::R_PPC64_ADDR16_LO_DS:
1060 case elfcpp::R_POWERPC_ADDR16_LO:
1061 case elfcpp::R_POWERPC_ADDR16_HI:
1062 case elfcpp::R_POWERPC_ADDR16_HA:
1063 case elfcpp::R_POWERPC_ADDR30:
1064 case elfcpp::R_PPC64_UADDR64:
1065 case elfcpp::R_POWERPC_UADDR32:
1066 case elfcpp::R_POWERPC_ADDR16:
1067 case elfcpp::R_POWERPC_UADDR16:
1068 case elfcpp::R_PPC64_ADDR16_DS:
1069 case elfcpp::R_PPC64_ADDR16_HIGHER:
1070 case elfcpp::R_PPC64_ADDR16_HIGHEST:
1071 case elfcpp::R_PPC64_ADDR16_HIGHERA:
1072 case elfcpp::R_PPC64_ADDR16_HIGHESTA:
1073 case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
1074 case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
1075 case elfcpp::R_POWERPC_REL32:
1076 case elfcpp::R_PPC64_REL64:
1087 // These are the relocation types supported only on 32-bit.
1094 // This prevents us from issuing more than one error per reloc
1095 // section. But we can still wind up issuing more than one
1096 // error per object file.
1097 if (this->issued_non_pic_error_)
1099 gold_assert(parameters->options().output_is_position_independent());
1100 object->error(_("requires unsupported dynamic reloc; "
1101 "recompile with -fPIC"));
1102 this->issued_non_pic_error_ = true;
1106 // Scan a relocation for a local symbol.
1108 template<int size, bool big_endian>
1110 Target_powerpc<size, big_endian>::Scan::local(
1111 Symbol_table* symtab,
1113 Target_powerpc<size, big_endian>* target,
1114 Sized_relobj<size, big_endian>* object,
1115 unsigned int data_shndx,
1116 Output_section* output_section,
1117 const elfcpp::Rela<size, big_endian>& reloc,
1118 unsigned int r_type,
1119 const elfcpp::Sym<size, big_endian>& lsym)
1123 case elfcpp::R_POWERPC_NONE:
1124 case elfcpp::R_POWERPC_GNU_VTINHERIT:
1125 case elfcpp::R_POWERPC_GNU_VTENTRY:
1128 case elfcpp::R_PPC64_ADDR64:
1129 case elfcpp::R_POWERPC_ADDR32:
1130 case elfcpp::R_POWERPC_ADDR16_HA:
1131 case elfcpp::R_POWERPC_ADDR16_LO:
1132 // If building a shared library (or a position-independent
1133 // executable), we need to create a dynamic relocation for
1135 if (parameters->options().output_is_position_independent())
1137 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1139 check_non_pic(object, r_type);
1140 if (lsym.get_st_type() != elfcpp::STT_SECTION)
1142 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
1143 rela_dyn->add_local(object, r_sym, r_type, output_section,
1144 data_shndx, reloc.get_r_offset(),
1145 reloc.get_r_addend());
1149 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
1150 gold_assert(lsym.get_st_value() == 0);
1151 rela_dyn->add_local_relative(object, r_sym, r_type,
1152 output_section, data_shndx,
1153 reloc.get_r_offset(),
1154 reloc.get_r_addend());
1159 case elfcpp::R_POWERPC_REL24:
1160 case elfcpp::R_PPC_LOCAL24PC:
1161 case elfcpp::R_POWERPC_REL32:
1162 case elfcpp::R_PPC_REL16_LO:
1163 case elfcpp::R_PPC_REL16_HA:
1166 case elfcpp::R_POWERPC_GOT16:
1167 case elfcpp::R_POWERPC_GOT16_LO:
1168 case elfcpp::R_POWERPC_GOT16_HI:
1169 case elfcpp::R_POWERPC_GOT16_HA:
1170 case elfcpp::R_PPC64_TOC16:
1171 case elfcpp::R_PPC64_TOC16_LO:
1172 case elfcpp::R_PPC64_TOC16_HI:
1173 case elfcpp::R_PPC64_TOC16_HA:
1174 case elfcpp::R_PPC64_TOC16_DS:
1175 case elfcpp::R_PPC64_TOC16_LO_DS:
1177 // The symbol requires a GOT entry.
1178 Output_data_got<size, big_endian>* got;
1181 got = target->got_section(symtab, layout);
1182 r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
1184 // If we are generating a shared object, we need to add a
1185 // dynamic relocation for this symbol's GOT entry.
1186 if (parameters->options().output_is_position_independent())
1188 if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD))
1190 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1193 off = got->add_constant(0);
1194 object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off);
1195 rela_dyn->add_local_relative(object, r_sym,
1196 elfcpp::R_POWERPC_RELATIVE,
1201 got->add_local(object, r_sym, GOT_TYPE_STANDARD);
1205 case elfcpp::R_PPC64_TOC:
1206 // We need a GOT section.
1207 target->got_section(symtab, layout);
1210 // These are relocations which should only be seen by the
1211 // dynamic linker, and should never be seen here.
1212 case elfcpp::R_POWERPC_COPY:
1213 case elfcpp::R_POWERPC_GLOB_DAT:
1214 case elfcpp::R_POWERPC_JMP_SLOT:
1215 case elfcpp::R_POWERPC_RELATIVE:
1216 case elfcpp::R_POWERPC_DTPMOD:
1217 gold_error(_("%s: unexpected reloc %u in object file"),
1218 object->name().c_str(), r_type);
1222 unsupported_reloc_local(object, r_type);
1227 // Report an unsupported relocation against a global symbol.
1229 template<int size, bool big_endian>
1231 Target_powerpc<size, big_endian>::Scan::unsupported_reloc_global(
1232 Sized_relobj<size, big_endian>* object,
1233 unsigned int r_type,
1236 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1237 object->name().c_str(), r_type, gsym->demangled_name().c_str());
1240 // Scan a relocation for a global symbol.
1242 template<int size, bool big_endian>
1244 Target_powerpc<size, big_endian>::Scan::global(
1245 Symbol_table* symtab,
1247 Target_powerpc<size, big_endian>* target,
1248 Sized_relobj<size, big_endian>* object,
1249 unsigned int data_shndx,
1250 Output_section* output_section,
1251 const elfcpp::Rela<size, big_endian>& reloc,
1252 unsigned int r_type,
1257 case elfcpp::R_POWERPC_NONE:
1258 case elfcpp::R_POWERPC_GNU_VTINHERIT:
1259 case elfcpp::R_POWERPC_GNU_VTENTRY:
1262 case elfcpp::R_PPC_PLTREL24:
1263 // If the symbol is fully resolved, this is just a PC32 reloc.
1264 // Otherwise we need a PLT entry.
1265 if (gsym->final_value_is_known())
1267 // If building a shared library, we can also skip the PLT entry
1268 // if the symbol is defined in the output file and is protected
1270 if (gsym->is_defined()
1271 && !gsym->is_from_dynobj()
1272 && !gsym->is_preemptible())
1274 target->make_plt_entry(symtab, layout, gsym);
1277 case elfcpp::R_POWERPC_ADDR16:
1278 case elfcpp::R_POWERPC_ADDR16_LO:
1279 case elfcpp::R_POWERPC_ADDR16_HI:
1280 case elfcpp::R_POWERPC_ADDR16_HA:
1281 case elfcpp::R_POWERPC_ADDR32:
1282 case elfcpp::R_PPC64_ADDR64:
1284 // Make a PLT entry if necessary.
1285 if (gsym->needs_plt_entry())
1287 target->make_plt_entry(symtab, layout, gsym);
1288 // Since this is not a PC-relative relocation, we may be
1289 // taking the address of a function. In that case we need to
1290 // set the entry in the dynamic symbol table to the address of
1292 if (gsym->is_from_dynobj() && !parameters->options().shared())
1293 gsym->set_needs_dynsym_value();
1295 // Make a dynamic relocation if necessary.
1296 if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF))
1298 if (gsym->may_need_copy_reloc())
1300 target->copy_reloc(symtab, layout, object,
1301 data_shndx, output_section, gsym, reloc);
1303 else if ((r_type == elfcpp::R_POWERPC_ADDR32
1304 || r_type == elfcpp::R_PPC64_ADDR64)
1305 && gsym->can_use_relative_reloc(false))
1307 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1308 rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE,
1309 output_section, object,
1310 data_shndx, reloc.get_r_offset(),
1311 reloc.get_r_addend());
1315 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1317 check_non_pic(object, r_type);
1318 if (gsym->is_from_dynobj()
1319 || gsym->is_undefined()
1320 || gsym->is_preemptible())
1321 rela_dyn->add_global(gsym, r_type, output_section,
1323 reloc.get_r_offset(),
1324 reloc.get_r_addend());
1326 rela_dyn->add_global_relative(gsym, r_type,
1327 output_section, object,
1329 reloc.get_r_offset(),
1330 reloc.get_r_addend());
1336 case elfcpp::R_POWERPC_REL24:
1337 case elfcpp::R_PPC_LOCAL24PC:
1338 case elfcpp::R_PPC_REL16:
1339 case elfcpp::R_PPC_REL16_LO:
1340 case elfcpp::R_PPC_REL16_HI:
1341 case elfcpp::R_PPC_REL16_HA:
1343 if (gsym->needs_plt_entry())
1344 target->make_plt_entry(symtab, layout, gsym);
1345 // Make a dynamic relocation if necessary.
1346 int flags = Symbol::NON_PIC_REF;
1347 if (gsym->type() == elfcpp::STT_FUNC)
1348 flags |= Symbol::FUNCTION_CALL;
1349 if (gsym->needs_dynamic_reloc(flags))
1351 if (gsym->may_need_copy_reloc())
1353 target->copy_reloc(symtab, layout, object,
1354 data_shndx, output_section, gsym,
1359 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1360 check_non_pic(object, r_type);
1361 rela_dyn->add_global(gsym, r_type, output_section, object,
1362 data_shndx, reloc.get_r_offset(),
1363 reloc.get_r_addend());
1369 case elfcpp::R_POWERPC_GOT16:
1370 case elfcpp::R_POWERPC_GOT16_LO:
1371 case elfcpp::R_POWERPC_GOT16_HI:
1372 case elfcpp::R_POWERPC_GOT16_HA:
1373 case elfcpp::R_PPC64_TOC16:
1374 case elfcpp::R_PPC64_TOC16_LO:
1375 case elfcpp::R_PPC64_TOC16_HI:
1376 case elfcpp::R_PPC64_TOC16_HA:
1377 case elfcpp::R_PPC64_TOC16_DS:
1378 case elfcpp::R_PPC64_TOC16_LO_DS:
1380 // The symbol requires a GOT entry.
1381 Output_data_got<size, big_endian>* got;
1383 got = target->got_section(symtab, layout);
1384 if (gsym->final_value_is_known())
1385 got->add_global(gsym, GOT_TYPE_STANDARD);
1388 // If this symbol is not fully resolved, we need to add a
1389 // dynamic relocation for it.
1390 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
1391 if (gsym->is_from_dynobj()
1392 || gsym->is_undefined()
1393 || gsym->is_preemptible())
1394 got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn,
1395 elfcpp::R_POWERPC_GLOB_DAT);
1396 else if (!gsym->has_got_offset(GOT_TYPE_STANDARD))
1398 unsigned int off = got->add_constant(0);
1400 gsym->set_got_offset(GOT_TYPE_STANDARD, off);
1401 rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE,
1408 case elfcpp::R_PPC64_TOC:
1409 // We need a GOT section.
1410 target->got_section(symtab, layout);
1413 case elfcpp::R_POWERPC_GOT_TPREL16:
1414 case elfcpp::R_POWERPC_TLS:
1418 // These are relocations which should only be seen by the
1419 // dynamic linker, and should never be seen here.
1420 case elfcpp::R_POWERPC_COPY:
1421 case elfcpp::R_POWERPC_GLOB_DAT:
1422 case elfcpp::R_POWERPC_JMP_SLOT:
1423 case elfcpp::R_POWERPC_RELATIVE:
1424 case elfcpp::R_POWERPC_DTPMOD:
1425 gold_error(_("%s: unexpected reloc %u in object file"),
1426 object->name().c_str(), r_type);
1430 unsupported_reloc_global(object, r_type, gsym);
1435 // Process relocations for gc.
1437 template<int size, bool big_endian>
1439 Target_powerpc<size, big_endian>::gc_process_relocs(
1440 Symbol_table* symtab,
1442 Sized_relobj<size, big_endian>* object,
1443 unsigned int data_shndx,
1445 const unsigned char* prelocs,
1447 Output_section* output_section,
1448 bool needs_special_offset_handling,
1449 size_t local_symbol_count,
1450 const unsigned char* plocal_symbols)
1452 typedef Target_powerpc<size, big_endian> Powerpc;
1453 typedef typename Target_powerpc<size, big_endian>::Scan Scan;
1455 gold::gc_process_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>(
1464 needs_special_offset_handling,
1469 // Scan relocations for a section.
1471 template<int size, bool big_endian>
1473 Target_powerpc<size, big_endian>::scan_relocs(
1474 Symbol_table* symtab,
1476 Sized_relobj<size, big_endian>* object,
1477 unsigned int data_shndx,
1478 unsigned int sh_type,
1479 const unsigned char* prelocs,
1481 Output_section* output_section,
1482 bool needs_special_offset_handling,
1483 size_t local_symbol_count,
1484 const unsigned char* plocal_symbols)
1486 typedef Target_powerpc<size, big_endian> Powerpc;
1487 typedef typename Target_powerpc<size, big_endian>::Scan Scan;
1488 static Output_data_space* sdata;
1490 if (sh_type == elfcpp::SHT_REL)
1492 gold_error(_("%s: unsupported REL reloc section"),
1493 object->name().c_str());
1497 // Define _SDA_BASE_ at the start of the .sdata section.
1500 // layout->find_output_section(".sdata") == NULL
1501 sdata = new Output_data_space(4, "** sdata");
1502 Output_section* os = layout->add_output_section_data(".sdata", 0,
1504 | elfcpp::SHF_WRITE,
1506 symtab->define_in_output_data("_SDA_BASE_", NULL,
1511 elfcpp::STV_HIDDEN, 0,
1515 gold::scan_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>(
1524 needs_special_offset_handling,
1529 // Finalize the sections.
1531 template<int size, bool big_endian>
1533 Target_powerpc<size, big_endian>::do_finalize_sections(Layout* layout)
1535 // Fill in some more dynamic tags.
1536 Output_data_dynamic* const odyn = layout->dynamic_data();
1539 if (this->plt_ != NULL)
1541 const Output_data* od = this->plt_->rel_plt();
1542 odyn->add_section_size(elfcpp::DT_PLTRELSZ, od);
1543 odyn->add_section_address(elfcpp::DT_JMPREL, od);
1544 odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA);
1546 odyn->add_section_address(elfcpp::DT_PLTGOT, this->plt_);
1549 if (this->rela_dyn_ != NULL)
1551 const Output_data* od = this->rela_dyn_;
1552 odyn->add_section_address(elfcpp::DT_RELA, od);
1553 odyn->add_section_size(elfcpp::DT_RELASZ, od);
1554 odyn->add_constant(elfcpp::DT_RELAENT,
1555 elfcpp::Elf_sizes<size>::rela_size);
1558 if (!parameters->options().shared())
1560 // The value of the DT_DEBUG tag is filled in by the dynamic
1561 // linker at run time, and used by the debugger.
1562 odyn->add_constant(elfcpp::DT_DEBUG, 0);
1566 // Emit any relocs we saved in an attempt to avoid generating COPY
1568 if (this->copy_relocs_.any_saved_relocs())
1569 this->copy_relocs_.emit(this->rela_dyn_section(layout));
1572 // Perform a relocation.
1574 template<int size, bool big_endian>
1576 Target_powerpc<size, big_endian>::Relocate::relocate(
1577 const Relocate_info<size, big_endian>* relinfo,
1578 Target_powerpc* target,
1581 const elfcpp::Rela<size, big_endian>& rela,
1582 unsigned int r_type,
1583 const Sized_symbol<size>* gsym,
1584 const Symbol_value<size>* psymval,
1585 unsigned char* view,
1586 typename elfcpp::Elf_types<size>::Elf_Addr address,
1587 section_size_type /* view_size */)
1589 const unsigned int toc_base_offset = 0x8000;
1590 typedef Powerpc_relocate_functions<size, big_endian> Reloc;
1592 // Pick the value to use for symbols defined in shared objects.
1593 Symbol_value<size> symval;
1595 && gsym->use_plt_offset(r_type == elfcpp::R_POWERPC_REL24
1596 || r_type == elfcpp::R_PPC_LOCAL24PC
1597 || r_type == elfcpp::R_PPC_REL16
1598 || r_type == elfcpp::R_PPC_REL16_LO
1599 || r_type == elfcpp::R_PPC_REL16_HI
1600 || r_type == elfcpp::R_PPC_REL16_HA))
1602 elfcpp::Elf_Xword value;
1604 value = target->plt_section()->address() + gsym->plt_offset();
1606 symval.set_output_value(value);
1611 const Sized_relobj<size, big_endian>* object = relinfo->object;
1612 elfcpp::Elf_Xword addend = rela.get_r_addend();
1614 // Get the GOT offset if needed. Unlike i386 and x86_64, our GOT
1615 // pointer points to the beginning, not the end, of the table.
1616 // So we just use the plain offset.
1617 bool have_got_offset = false;
1618 unsigned int got_offset = 0;
1619 unsigned int got2_offset = 0;
1622 case elfcpp::R_PPC64_TOC16:
1623 case elfcpp::R_PPC64_TOC16_LO:
1624 case elfcpp::R_PPC64_TOC16_HI:
1625 case elfcpp::R_PPC64_TOC16_HA:
1626 case elfcpp::R_PPC64_TOC16_DS:
1627 case elfcpp::R_PPC64_TOC16_LO_DS:
1628 // Subtract the TOC base address.
1629 addend -= target->toc_section()->address() + toc_base_offset;
1632 case elfcpp::R_POWERPC_GOT16:
1633 case elfcpp::R_POWERPC_GOT16_LO:
1634 case elfcpp::R_POWERPC_GOT16_HI:
1635 case elfcpp::R_POWERPC_GOT16_HA:
1636 case elfcpp::R_PPC64_GOT16_DS:
1637 case elfcpp::R_PPC64_GOT16_LO_DS:
1640 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
1641 got_offset = gsym->got_offset(GOT_TYPE_STANDARD);
1645 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
1646 gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
1647 got_offset = object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
1649 have_got_offset = true;
1652 // R_PPC_PLTREL24 is rather special. If non-zero,
1653 // the addend specifies the GOT pointer offset within .got2.
1654 case elfcpp::R_PPC_PLTREL24:
1655 if (addend >= 32768)
1657 Output_data_space* got2;
1658 got2 = target->got2_section();
1659 got2_offset = got2->offset();
1660 addend += got2_offset;
1662 have_got_offset = true;
1671 case elfcpp::R_POWERPC_NONE:
1672 case elfcpp::R_POWERPC_GNU_VTINHERIT:
1673 case elfcpp::R_POWERPC_GNU_VTENTRY:
1676 case elfcpp::R_POWERPC_REL32:
1677 Reloc::rel32(view, object, psymval, addend, address);
1680 case elfcpp::R_POWERPC_REL24:
1681 Reloc::rel24(view, object, psymval, addend, address);
1684 case elfcpp::R_POWERPC_REL14:
1685 Reloc::rel14(view, object, psymval, addend, address);
1688 case elfcpp::R_PPC_PLTREL24:
1689 Reloc::rel24(view, object, psymval, addend, address);
1692 case elfcpp::R_PPC_LOCAL24PC:
1693 Reloc::rel24(view, object, psymval, addend, address);
1696 case elfcpp::R_PPC64_ADDR64:
1697 if (!parameters->options().output_is_position_independent())
1698 Relocate_functions<size, big_endian>::rela64(view, object,
1702 case elfcpp::R_POWERPC_ADDR32:
1703 if (!parameters->options().output_is_position_independent())
1704 Relocate_functions<size, big_endian>::rela32(view, object,
1708 case elfcpp::R_POWERPC_ADDR16_LO:
1709 Reloc::addr16_lo(view, object, psymval, addend);
1712 case elfcpp::R_POWERPC_ADDR16_HI:
1713 Reloc::addr16_hi(view, object, psymval, addend);
1716 case elfcpp::R_POWERPC_ADDR16_HA:
1717 Reloc::addr16_ha(view, object, psymval, addend);
1720 case elfcpp::R_PPC_REL16_LO:
1721 Reloc::rel16_lo(view, object, psymval, addend, address);
1724 case elfcpp::R_PPC_REL16_HI:
1725 Reloc::rel16_lo(view, object, psymval, addend, address);
1728 case elfcpp::R_PPC_REL16_HA:
1729 Reloc::rel16_ha(view, object, psymval, addend, address);
1732 case elfcpp::R_POWERPC_GOT16:
1733 Reloc::addr16(view, got_offset, addend);
1736 case elfcpp::R_POWERPC_GOT16_LO:
1737 Reloc::addr16_lo(view, got_offset, addend);
1740 case elfcpp::R_POWERPC_GOT16_HI:
1741 Reloc::addr16_hi(view, got_offset, addend);
1744 case elfcpp::R_POWERPC_GOT16_HA:
1745 Reloc::addr16_ha(view, got_offset, addend);
1748 case elfcpp::R_PPC64_TOC16:
1749 Reloc::addr16(view, got_offset, addend);
1752 case elfcpp::R_PPC64_TOC16_LO:
1753 Reloc::addr16_lo(view, got_offset, addend);
1756 case elfcpp::R_PPC64_TOC16_HI:
1757 Reloc::addr16_hi(view, got_offset, addend);
1760 case elfcpp::R_PPC64_TOC16_HA:
1761 Reloc::addr16_ha(view, got_offset, addend);
1764 case elfcpp::R_PPC64_TOC16_DS:
1765 case elfcpp::R_PPC64_TOC16_LO_DS:
1766 Reloc::addr16_ds(view, got_offset, addend);
1769 case elfcpp::R_PPC64_TOC:
1771 elfcpp::Elf_types<64>::Elf_Addr value;
1772 value = target->toc_section()->address() + toc_base_offset;
1773 Relocate_functions<64, false>::rela64(view, value, addend);
1777 case elfcpp::R_POWERPC_COPY:
1778 case elfcpp::R_POWERPC_GLOB_DAT:
1779 case elfcpp::R_POWERPC_JMP_SLOT:
1780 case elfcpp::R_POWERPC_RELATIVE:
1781 // This is an outstanding tls reloc, which is unexpected when
1783 case elfcpp::R_POWERPC_DTPMOD:
1784 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
1785 _("unexpected reloc %u in object file"),
1790 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
1791 _("unsupported reloc %u"),
1799 // Perform a TLS relocation.
1801 template<int size, bool big_endian>
1803 Target_powerpc<size, big_endian>::Relocate::relocate_tls(
1804 const Relocate_info<size, big_endian>* relinfo,
1805 Target_powerpc<size, big_endian>* target,
1807 const elfcpp::Rela<size, big_endian>& rela,
1808 unsigned int r_type,
1809 const Sized_symbol<size>* gsym,
1810 const Symbol_value<size>* psymval,
1811 unsigned char* view,
1812 typename elfcpp::Elf_types<size>::Elf_Addr address,
1815 Output_segment* tls_segment = relinfo->layout->tls_segment();
1816 typedef Powerpc_relocate_functions<size, big_endian> Reloc;
1817 const Sized_relobj<size, big_endian>* object = relinfo->object;
1819 const elfcpp::Elf_Xword addend = rela.get_r_addend();
1820 typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(object, 0);
1822 const bool is_final =
1824 ? !parameters->options().output_is_position_independent()
1825 : gsym->final_value_is_known());
1826 const tls::Tls_optimization optimized_type
1827 = optimize_tls_reloc(is_final, r_type);
1835 // Relocate section data.
1837 template<int size, bool big_endian>
1839 Target_powerpc<size, big_endian>::relocate_section(
1840 const Relocate_info<size, big_endian>* relinfo,
1841 unsigned int sh_type,
1842 const unsigned char* prelocs,
1844 Output_section* output_section,
1845 bool needs_special_offset_handling,
1846 unsigned char* view,
1847 typename elfcpp::Elf_types<size>::Elf_Addr address,
1848 section_size_type view_size,
1849 const Reloc_symbol_changes* reloc_symbol_changes)
1851 typedef Target_powerpc<size, big_endian> Powerpc;
1852 typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate;
1854 gold_assert(sh_type == elfcpp::SHT_RELA);
1856 gold::relocate_section<size, big_endian, Powerpc, elfcpp::SHT_RELA,
1863 needs_special_offset_handling,
1867 reloc_symbol_changes);
1870 // Return the size of a relocation while scanning during a relocatable
1873 template<int size, bool big_endian>
1875 Target_powerpc<size, big_endian>::Relocatable_size_for_reloc::get_size_for_reloc(
1879 // We are always SHT_RELA, so we should never get here.
1884 // Scan the relocs during a relocatable link.
1886 template<int size, bool big_endian>
1888 Target_powerpc<size, big_endian>::scan_relocatable_relocs(
1889 Symbol_table* symtab,
1891 Sized_relobj<size, big_endian>* object,
1892 unsigned int data_shndx,
1893 unsigned int sh_type,
1894 const unsigned char* prelocs,
1896 Output_section* output_section,
1897 bool needs_special_offset_handling,
1898 size_t local_symbol_count,
1899 const unsigned char* plocal_symbols,
1900 Relocatable_relocs* rr)
1902 gold_assert(sh_type == elfcpp::SHT_RELA);
1904 typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA,
1905 Relocatable_size_for_reloc> Scan_relocatable_relocs;
1907 gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA,
1908 Scan_relocatable_relocs>(
1916 needs_special_offset_handling,
1922 // Relocate a section during a relocatable link.
1924 template<int size, bool big_endian>
1926 Target_powerpc<size, big_endian>::relocate_for_relocatable(
1927 const Relocate_info<size, big_endian>* relinfo,
1928 unsigned int sh_type,
1929 const unsigned char* prelocs,
1931 Output_section* output_section,
1932 off_t offset_in_output_section,
1933 const Relocatable_relocs* rr,
1934 unsigned char* view,
1935 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
1936 section_size_type view_size,
1937 unsigned char* reloc_view,
1938 section_size_type reloc_view_size)
1940 gold_assert(sh_type == elfcpp::SHT_RELA);
1942 gold::relocate_for_relocatable<size, big_endian, elfcpp::SHT_RELA>(
1947 offset_in_output_section,
1956 // Return the value to use for a dynamic which requires special
1957 // treatment. This is how we support equality comparisons of function
1958 // pointers across shared library boundaries, as described in the
1959 // processor specific ABI supplement.
1961 template<int size, bool big_endian>
1963 Target_powerpc<size, big_endian>::do_dynsym_value(const Symbol* gsym) const
1965 gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
1966 return this->plt_section()->address() + gsym->plt_offset();
1969 // The selector for powerpc object files.
1971 template<int size, bool big_endian>
1972 class Target_selector_powerpc : public Target_selector
1975 Target_selector_powerpc()
1976 : Target_selector(elfcpp::EM_NONE, size, big_endian,
1978 (big_endian ? "elf64-powerpc" : "elf64-powerpcle") :
1979 (big_endian ? "elf32-powerpc" : "elf32-powerpcle")))
1982 Target* do_recognize(int machine, int, int)
1987 if (machine != elfcpp::EM_PPC64)
1992 if (machine != elfcpp::EM_PPC)
2000 return this->instantiate_target();
2003 Target* do_instantiate_target()
2004 { return new Target_powerpc<size, big_endian>(); }
2007 Target_selector_powerpc<32, true> target_selector_ppc32;
2008 Target_selector_powerpc<32, false> target_selector_ppc32le;
2009 Target_selector_powerpc<64, true> target_selector_ppc64;
2010 Target_selector_powerpc<64, false> target_selector_ppc64le;
2012 } // End anonymous namespace.