1 // i386.cc -- i386 target support for gold.
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
29 #include "parameters.h"
36 #include "copy-relocs.h"
38 #include "target-reloc.h"
39 #include "target-select.h"
49 // A class to handle the PLT data.
51 class Output_data_plt_i386
: public Output_section_data
54 typedef Output_data_reloc
<elfcpp::SHT_REL
, true, 32, false> Reloc_section
;
56 Output_data_plt_i386(Layout
*, Output_data_space
*, Output_data_space
*);
58 // Add an entry to the PLT.
60 add_entry(Symbol_table
*, Layout
*, Symbol
* gsym
);
62 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
64 add_local_ifunc_entry(Symbol_table
*, Layout
*,
65 Sized_relobj_file
<32, false>* relobj
,
66 unsigned int local_sym_index
);
68 // Return the .rel.plt section data.
71 { return this->rel_
; }
73 // Return where the TLS_DESC relocations should go.
75 rel_tls_desc(Layout
*);
77 // Return where the IRELATIVE relocations should go.
79 rel_irelative(Symbol_table
*, Layout
*);
81 // Return whether we created a section for IRELATIVE relocations.
83 has_irelative_section() const
84 { return this->irelative_rel_
!= NULL
; }
86 // Return the number of PLT entries.
89 { return this->count_
+ this->irelative_count_
; }
91 // Return the offset of the first non-reserved PLT entry.
93 first_plt_entry_offset()
94 { return plt_entry_size
; }
96 // Return the size of a PLT entry.
99 { return plt_entry_size
; }
101 // Return the PLT address to use for a global symbol.
103 address_for_global(const Symbol
*);
105 // Return the PLT address to use for a local symbol.
107 address_for_local(const Relobj
*, unsigned int symndx
);
111 do_adjust_output_section(Output_section
* os
);
113 // Write to a map file.
115 do_print_to_mapfile(Mapfile
* mapfile
) const
116 { mapfile
->print_output_data(this, _("** PLT")); }
119 // The size of an entry in the PLT.
120 static const int plt_entry_size
= 16;
122 // The first entry in the PLT for an executable.
123 static const unsigned char exec_first_plt_entry
[plt_entry_size
];
125 // The first entry in the PLT for a shared object.
126 static const unsigned char dyn_first_plt_entry
[plt_entry_size
];
128 // Other entries in the PLT for an executable.
129 static const unsigned char exec_plt_entry
[plt_entry_size
];
131 // Other entries in the PLT for a shared object.
132 static const unsigned char dyn_plt_entry
[plt_entry_size
];
134 // The .eh_frame unwind information for the PLT.
135 static const int plt_eh_frame_cie_size
= 16;
136 static const int plt_eh_frame_fde_size
= 32;
137 static const unsigned char plt_eh_frame_cie
[plt_eh_frame_cie_size
];
138 static const unsigned char plt_eh_frame_fde
[plt_eh_frame_fde_size
];
140 // Set the final size.
142 set_final_data_size()
144 this->set_data_size((this->count_
+ this->irelative_count_
+ 1)
148 // Write out the PLT data.
150 do_write(Output_file
*);
152 // We keep a list of global STT_GNU_IFUNC symbols, each with its
153 // offset in the GOT.
157 unsigned int got_offset
;
160 // We keep a list of local STT_GNU_IFUNC symbols, each with its
161 // offset in the GOT.
164 Sized_relobj_file
<32, false>* object
;
165 unsigned int local_sym_index
;
166 unsigned int got_offset
;
169 // The reloc section.
171 // The TLS_DESC relocations, if necessary. These must follow the
172 // regular PLT relocs.
173 Reloc_section
* tls_desc_rel_
;
174 // The IRELATIVE relocations, if necessary. These must follow the
175 // regular relocatoins and the TLS_DESC relocations.
176 Reloc_section
* irelative_rel_
;
177 // The .got.plt section.
178 Output_data_space
* got_plt_
;
179 // The part of the .got.plt section used for IRELATIVE relocs.
180 Output_data_space
* got_irelative_
;
181 // The number of PLT entries.
183 // Number of PLT entries with R_386_IRELATIVE relocs. These follow
184 // the regular PLT entries.
185 unsigned int irelative_count_
;
186 // Global STT_GNU_IFUNC symbols.
187 std::vector
<Global_ifunc
> global_ifuncs_
;
188 // Local STT_GNU_IFUNC symbols.
189 std::vector
<Local_ifunc
> local_ifuncs_
;
192 // The i386 target class.
193 // TLS info comes from
194 // http://people.redhat.com/drepper/tls.pdf
195 // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
197 class Target_i386
: public Sized_target
<32, false>
200 typedef Output_data_reloc
<elfcpp::SHT_REL
, true, 32, false> Reloc_section
;
203 : Sized_target
<32, false>(&i386_info
),
204 got_(NULL
), plt_(NULL
), got_plt_(NULL
), got_irelative_(NULL
),
205 got_tlsdesc_(NULL
), global_offset_table_(NULL
), rel_dyn_(NULL
),
206 rel_irelative_(NULL
), copy_relocs_(elfcpp::R_386_COPY
), dynbss_(NULL
),
207 got_mod_index_offset_(-1U), tls_base_symbol_defined_(false)
210 // Process the relocations to determine unreferenced sections for
211 // garbage collection.
213 gc_process_relocs(Symbol_table
* symtab
,
215 Sized_relobj_file
<32, false>* object
,
216 unsigned int data_shndx
,
217 unsigned int sh_type
,
218 const unsigned char* prelocs
,
220 Output_section
* output_section
,
221 bool needs_special_offset_handling
,
222 size_t local_symbol_count
,
223 const unsigned char* plocal_symbols
);
225 // Scan the relocations to look for symbol adjustments.
227 scan_relocs(Symbol_table
* symtab
,
229 Sized_relobj_file
<32, false>* object
,
230 unsigned int data_shndx
,
231 unsigned int sh_type
,
232 const unsigned char* prelocs
,
234 Output_section
* output_section
,
235 bool needs_special_offset_handling
,
236 size_t local_symbol_count
,
237 const unsigned char* plocal_symbols
);
239 // Finalize the sections.
241 do_finalize_sections(Layout
*, const Input_objects
*, Symbol_table
*);
243 // Return the value to use for a dynamic which requires special
246 do_dynsym_value(const Symbol
*) const;
248 // Relocate a section.
250 relocate_section(const Relocate_info
<32, false>*,
251 unsigned int sh_type
,
252 const unsigned char* prelocs
,
254 Output_section
* output_section
,
255 bool needs_special_offset_handling
,
257 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
258 section_size_type view_size
,
259 const Reloc_symbol_changes
*);
261 // Scan the relocs during a relocatable link.
263 scan_relocatable_relocs(Symbol_table
* symtab
,
265 Sized_relobj_file
<32, false>* object
,
266 unsigned int data_shndx
,
267 unsigned int sh_type
,
268 const unsigned char* prelocs
,
270 Output_section
* output_section
,
271 bool needs_special_offset_handling
,
272 size_t local_symbol_count
,
273 const unsigned char* plocal_symbols
,
274 Relocatable_relocs
*);
276 // Relocate a section during a relocatable link.
278 relocate_for_relocatable(const Relocate_info
<32, false>*,
279 unsigned int sh_type
,
280 const unsigned char* prelocs
,
282 Output_section
* output_section
,
283 off_t offset_in_output_section
,
284 const Relocatable_relocs
*,
286 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
287 section_size_type view_size
,
288 unsigned char* reloc_view
,
289 section_size_type reloc_view_size
);
291 // Return a string used to fill a code section with nops.
293 do_code_fill(section_size_type length
) const;
295 // Return whether SYM is defined by the ABI.
297 do_is_defined_by_abi(const Symbol
* sym
) const
298 { return strcmp(sym
->name(), "___tls_get_addr") == 0; }
300 // Return whether a symbol name implies a local label. The UnixWare
301 // 2.1 cc generates temporary symbols that start with .X, so we
302 // recognize them here. FIXME: do other SVR4 compilers also use .X?.
303 // If so, we should move the .X recognition into
304 // Target::do_is_local_label_name.
306 do_is_local_label_name(const char* name
) const
308 if (name
[0] == '.' && name
[1] == 'X')
310 return Target::do_is_local_label_name(name
);
313 // Return the PLT address to use for a global symbol.
315 do_plt_address_for_global(const Symbol
* gsym
) const
316 { return this->plt_section()->address_for_global(gsym
); }
319 do_plt_address_for_local(const Relobj
* relobj
, unsigned int symndx
) const
320 { return this->plt_section()->address_for_local(relobj
, symndx
); }
322 // We can tell whether we take the address of a function.
324 do_can_check_for_function_pointers() const
327 // Return the base for a DW_EH_PE_datarel encoding.
329 do_ehframe_datarel_base() const;
331 // Return whether SYM is call to a non-split function.
333 do_is_call_to_non_split(const Symbol
* sym
, unsigned int) const;
335 // Adjust -fsplit-stack code which calls non-split-stack code.
337 do_calls_non_split(Relobj
* object
, unsigned int shndx
,
338 section_offset_type fnoffset
, section_size_type fnsize
,
339 unsigned char* view
, section_size_type view_size
,
340 std::string
* from
, std::string
* to
) const;
342 // Return the size of the GOT section.
346 gold_assert(this->got_
!= NULL
);
347 return this->got_
->data_size();
350 // Return the number of entries in the GOT.
352 got_entry_count() const
354 if (this->got_
== NULL
)
356 return this->got_size() / 4;
359 // Return the number of entries in the PLT.
361 plt_entry_count() const;
363 // Return the offset of the first non-reserved PLT entry.
365 first_plt_entry_offset() const;
367 // Return the size of each PLT entry.
369 plt_entry_size() const;
372 // The class which scans relocations.
377 get_reference_flags(unsigned int r_type
);
380 local(Symbol_table
* symtab
, Layout
* layout
, Target_i386
* target
,
381 Sized_relobj_file
<32, false>* object
,
382 unsigned int data_shndx
,
383 Output_section
* output_section
,
384 const elfcpp::Rel
<32, false>& reloc
, unsigned int r_type
,
385 const elfcpp::Sym
<32, false>& lsym
);
388 global(Symbol_table
* symtab
, Layout
* layout
, Target_i386
* target
,
389 Sized_relobj_file
<32, false>* object
,
390 unsigned int data_shndx
,
391 Output_section
* output_section
,
392 const elfcpp::Rel
<32, false>& reloc
, unsigned int r_type
,
396 local_reloc_may_be_function_pointer(Symbol_table
* symtab
, Layout
* layout
,
398 Sized_relobj_file
<32, false>* object
,
399 unsigned int data_shndx
,
400 Output_section
* output_section
,
401 const elfcpp::Rel
<32, false>& reloc
,
403 const elfcpp::Sym
<32, false>& lsym
);
406 global_reloc_may_be_function_pointer(Symbol_table
* symtab
, Layout
* layout
,
408 Sized_relobj_file
<32, false>* object
,
409 unsigned int data_shndx
,
410 Output_section
* output_section
,
411 const elfcpp::Rel
<32, false>& reloc
,
416 possible_function_pointer_reloc(unsigned int r_type
);
419 reloc_needs_plt_for_ifunc(Sized_relobj_file
<32, false>*,
420 unsigned int r_type
);
423 unsupported_reloc_local(Sized_relobj_file
<32, false>*, unsigned int r_type
);
426 unsupported_reloc_global(Sized_relobj_file
<32, false>*, unsigned int r_type
,
430 // The class which implements relocation.
435 : skip_call_tls_get_addr_(false),
436 local_dynamic_type_(LOCAL_DYNAMIC_NONE
)
441 if (this->skip_call_tls_get_addr_
)
443 // FIXME: This needs to specify the location somehow.
444 gold_error(_("missing expected TLS relocation"));
448 // Return whether the static relocation needs to be applied.
450 should_apply_static_reloc(const Sized_symbol
<32>* gsym
,
453 Output_section
* output_section
);
455 // Do a relocation. Return false if the caller should not issue
456 // any warnings about this relocation.
458 relocate(const Relocate_info
<32, false>*, Target_i386
*, Output_section
*,
459 size_t relnum
, const elfcpp::Rel
<32, false>&,
460 unsigned int r_type
, const Sized_symbol
<32>*,
461 const Symbol_value
<32>*,
462 unsigned char*, elfcpp::Elf_types
<32>::Elf_Addr
,
466 // Do a TLS relocation.
468 relocate_tls(const Relocate_info
<32, false>*, Target_i386
* target
,
469 size_t relnum
, const elfcpp::Rel
<32, false>&,
470 unsigned int r_type
, const Sized_symbol
<32>*,
471 const Symbol_value
<32>*,
472 unsigned char*, elfcpp::Elf_types
<32>::Elf_Addr
,
475 // Do a TLS General-Dynamic to Initial-Exec transition.
477 tls_gd_to_ie(const Relocate_info
<32, false>*, size_t relnum
,
478 Output_segment
* tls_segment
,
479 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
480 elfcpp::Elf_types
<32>::Elf_Addr value
,
482 section_size_type view_size
);
484 // Do a TLS General-Dynamic to Local-Exec transition.
486 tls_gd_to_le(const Relocate_info
<32, false>*, size_t relnum
,
487 Output_segment
* tls_segment
,
488 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
489 elfcpp::Elf_types
<32>::Elf_Addr value
,
491 section_size_type view_size
);
493 // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec
496 tls_desc_gd_to_ie(const Relocate_info
<32, false>*, size_t relnum
,
497 Output_segment
* tls_segment
,
498 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
499 elfcpp::Elf_types
<32>::Elf_Addr value
,
501 section_size_type view_size
);
503 // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec
506 tls_desc_gd_to_le(const Relocate_info
<32, false>*, size_t relnum
,
507 Output_segment
* tls_segment
,
508 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
509 elfcpp::Elf_types
<32>::Elf_Addr value
,
511 section_size_type view_size
);
513 // Do a TLS Local-Dynamic to Local-Exec transition.
515 tls_ld_to_le(const Relocate_info
<32, false>*, size_t relnum
,
516 Output_segment
* tls_segment
,
517 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
518 elfcpp::Elf_types
<32>::Elf_Addr value
,
520 section_size_type view_size
);
522 // Do a TLS Initial-Exec to Local-Exec transition.
524 tls_ie_to_le(const Relocate_info
<32, false>*, size_t relnum
,
525 Output_segment
* tls_segment
,
526 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
527 elfcpp::Elf_types
<32>::Elf_Addr value
,
529 section_size_type view_size
);
531 // We need to keep track of which type of local dynamic relocation
532 // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly.
533 enum Local_dynamic_type
540 // This is set if we should skip the next reloc, which should be a
541 // PLT32 reloc against ___tls_get_addr.
542 bool skip_call_tls_get_addr_
;
543 // The type of local dynamic relocation we have seen in the section
544 // being relocated, if any.
545 Local_dynamic_type local_dynamic_type_
;
548 // A class which returns the size required for a relocation type,
549 // used while scanning relocs during a relocatable link.
550 class Relocatable_size_for_reloc
554 get_size_for_reloc(unsigned int, Relobj
*);
557 // Adjust TLS relocation type based on the options and whether this
558 // is a local symbol.
559 static tls::Tls_optimization
560 optimize_tls_reloc(bool is_final
, int r_type
);
562 // Get the GOT section, creating it if necessary.
563 Output_data_got
<32, false>*
564 got_section(Symbol_table
*, Layout
*);
566 // Get the GOT PLT section.
568 got_plt_section() const
570 gold_assert(this->got_plt_
!= NULL
);
571 return this->got_plt_
;
574 // Get the GOT section for TLSDESC entries.
575 Output_data_got
<32, false>*
576 got_tlsdesc_section() const
578 gold_assert(this->got_tlsdesc_
!= NULL
);
579 return this->got_tlsdesc_
;
582 // Create the PLT section.
584 make_plt_section(Symbol_table
* symtab
, Layout
* layout
);
586 // Create a PLT entry for a global symbol.
588 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
590 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
592 make_local_ifunc_plt_entry(Symbol_table
*, Layout
*,
593 Sized_relobj_file
<32, false>* relobj
,
594 unsigned int local_sym_index
);
596 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
598 define_tls_base_symbol(Symbol_table
*, Layout
*);
600 // Create a GOT entry for the TLS module index.
602 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
603 Sized_relobj_file
<32, false>* object
);
605 // Get the PLT section.
606 Output_data_plt_i386
*
609 gold_assert(this->plt_
!= NULL
);
613 // Get the dynamic reloc section, creating it if necessary.
615 rel_dyn_section(Layout
*);
617 // Get the section to use for TLS_DESC relocations.
619 rel_tls_desc_section(Layout
*) const;
621 // Get the section to use for IRELATIVE relocations.
623 rel_irelative_section(Layout
*);
625 // Add a potential copy relocation.
627 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
628 Sized_relobj_file
<32, false>* object
,
629 unsigned int shndx
, Output_section
* output_section
,
630 Symbol
* sym
, const elfcpp::Rel
<32, false>& reloc
)
632 this->copy_relocs_
.copy_reloc(symtab
, layout
,
633 symtab
->get_sized_symbol
<32>(sym
),
634 object
, shndx
, output_section
, reloc
,
635 this->rel_dyn_section(layout
));
638 // Information about this specific target which we pass to the
639 // general Target structure.
640 static const Target::Target_info i386_info
;
642 // The types of GOT entries needed for this platform.
643 // These values are exposed to the ABI in an incremental link.
644 // Do not renumber existing values without changing the version
645 // number of the .gnu_incremental_inputs section.
648 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
649 GOT_TYPE_TLS_NOFFSET
= 1, // GOT entry for negative TLS offset
650 GOT_TYPE_TLS_OFFSET
= 2, // GOT entry for positive TLS offset
651 GOT_TYPE_TLS_PAIR
= 3, // GOT entry for TLS module/offset pair
652 GOT_TYPE_TLS_DESC
= 4 // GOT entry for TLS_DESC pair
656 Output_data_got
<32, false>* got_
;
658 Output_data_plt_i386
* plt_
;
659 // The GOT PLT section.
660 Output_data_space
* got_plt_
;
661 // The GOT section for IRELATIVE relocations.
662 Output_data_space
* got_irelative_
;
663 // The GOT section for TLSDESC relocations.
664 Output_data_got
<32, false>* got_tlsdesc_
;
665 // The _GLOBAL_OFFSET_TABLE_ symbol.
666 Symbol
* global_offset_table_
;
667 // The dynamic reloc section.
668 Reloc_section
* rel_dyn_
;
669 // The section to use for IRELATIVE relocs.
670 Reloc_section
* rel_irelative_
;
671 // Relocs saved to avoid a COPY reloc.
672 Copy_relocs
<elfcpp::SHT_REL
, 32, false> copy_relocs_
;
673 // Space for variables copied with a COPY reloc.
674 Output_data_space
* dynbss_
;
675 // Offset of the GOT entry for the TLS module index.
676 unsigned int got_mod_index_offset_
;
677 // True if the _TLS_MODULE_BASE_ symbol has been defined.
678 bool tls_base_symbol_defined_
;
681 const Target::Target_info
Target_i386::i386_info
=
684 false, // is_big_endian
685 elfcpp::EM_386
, // machine_code
686 false, // has_make_symbol
687 false, // has_resolve
688 true, // has_code_fill
689 true, // is_default_stack_executable
690 true, // can_icf_inline_merge_sections
692 "/usr/lib/libc.so.1", // dynamic_linker
693 0x08048000, // default_text_segment_address
694 0x1000, // abi_pagesize (overridable by -z max-page-size)
695 0x1000, // common_pagesize (overridable by -z common-page-size)
696 elfcpp::SHN_UNDEF
, // small_common_shndx
697 elfcpp::SHN_UNDEF
, // large_common_shndx
698 0, // small_common_section_flags
699 0, // large_common_section_flags
700 NULL
, // attributes_section
701 NULL
// attributes_vendor
704 // Get the GOT section, creating it if necessary.
706 Output_data_got
<32, false>*
707 Target_i386::got_section(Symbol_table
* symtab
, Layout
* layout
)
709 if (this->got_
== NULL
)
711 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
713 this->got_
= new Output_data_got
<32, false>();
715 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
717 | elfcpp::SHF_WRITE
),
718 this->got_
, ORDER_RELRO_LAST
, true);
720 this->got_plt_
= new Output_data_space(4, "** GOT PLT");
721 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
723 | elfcpp::SHF_WRITE
),
724 this->got_plt_
, ORDER_NON_RELRO_FIRST
,
727 // The first three entries are reserved.
728 this->got_plt_
->set_current_data_size(3 * 4);
730 // Those bytes can go into the relro segment.
731 layout
->increase_relro(3 * 4);
733 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
734 this->global_offset_table_
=
735 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
736 Symbol_table::PREDEFINED
,
738 0, 0, elfcpp::STT_OBJECT
,
740 elfcpp::STV_HIDDEN
, 0,
743 // If there are any IRELATIVE relocations, they get GOT entries
744 // in .got.plt after the jump slot relocations.
745 this->got_irelative_
= new Output_data_space(4, "** GOT IRELATIVE PLT");
746 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
748 | elfcpp::SHF_WRITE
),
749 this->got_irelative_
,
750 ORDER_NON_RELRO_FIRST
, false);
752 // If there are any TLSDESC relocations, they get GOT entries in
753 // .got.plt after the jump slot entries.
754 this->got_tlsdesc_
= new Output_data_got
<32, false>();
755 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
757 | elfcpp::SHF_WRITE
),
759 ORDER_NON_RELRO_FIRST
, false);
765 // Get the dynamic reloc section, creating it if necessary.
767 Target_i386::Reloc_section
*
768 Target_i386::rel_dyn_section(Layout
* layout
)
770 if (this->rel_dyn_
== NULL
)
772 gold_assert(layout
!= NULL
);
773 this->rel_dyn_
= new Reloc_section(parameters
->options().combreloc());
774 layout
->add_output_section_data(".rel.dyn", elfcpp::SHT_REL
,
775 elfcpp::SHF_ALLOC
, this->rel_dyn_
,
776 ORDER_DYNAMIC_RELOCS
, false);
778 return this->rel_dyn_
;
781 // Get the section to use for IRELATIVE relocs, creating it if
782 // necessary. These go in .rel.dyn, but only after all other dynamic
783 // relocations. They need to follow the other dynamic relocations so
784 // that they can refer to global variables initialized by those
787 Target_i386::Reloc_section
*
788 Target_i386::rel_irelative_section(Layout
* layout
)
790 if (this->rel_irelative_
== NULL
)
792 // Make sure we have already create the dynamic reloc section.
793 this->rel_dyn_section(layout
);
794 this->rel_irelative_
= new Reloc_section(false);
795 layout
->add_output_section_data(".rel.dyn", elfcpp::SHT_REL
,
796 elfcpp::SHF_ALLOC
, this->rel_irelative_
,
797 ORDER_DYNAMIC_RELOCS
, false);
798 gold_assert(this->rel_dyn_
->output_section()
799 == this->rel_irelative_
->output_section());
801 return this->rel_irelative_
;
804 // Create the PLT section. The ordinary .got section is an argument,
805 // since we need to refer to the start. We also create our own .got
806 // section just for PLT entries.
808 Output_data_plt_i386::Output_data_plt_i386(Layout
* layout
,
809 Output_data_space
* got_plt
,
810 Output_data_space
* got_irelative
)
811 : Output_section_data(16), tls_desc_rel_(NULL
), irelative_rel_(NULL
),
812 got_plt_(got_plt
), got_irelative_(got_irelative
), count_(0),
813 irelative_count_(0), global_ifuncs_(), local_ifuncs_()
815 this->rel_
= new Reloc_section(false);
816 layout
->add_output_section_data(".rel.plt", elfcpp::SHT_REL
,
817 elfcpp::SHF_ALLOC
, this->rel_
,
818 ORDER_DYNAMIC_PLT_RELOCS
, false);
820 // Add unwind information if requested.
821 if (parameters
->options().ld_generated_unwind_info())
822 layout
->add_eh_frame_for_plt(this, plt_eh_frame_cie
, plt_eh_frame_cie_size
,
823 plt_eh_frame_fde
, plt_eh_frame_fde_size
);
827 Output_data_plt_i386::do_adjust_output_section(Output_section
* os
)
829 // UnixWare sets the entsize of .plt to 4, and so does the old GNU
830 // linker, and so do we.
834 // Add an entry to the PLT.
837 Output_data_plt_i386::add_entry(Symbol_table
* symtab
, Layout
* layout
,
840 gold_assert(!gsym
->has_plt_offset());
842 // Every PLT entry needs a reloc.
843 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
844 && gsym
->can_use_relative_reloc(false))
846 gsym
->set_plt_offset(this->irelative_count_
* plt_entry_size
);
847 ++this->irelative_count_
;
848 section_offset_type got_offset
=
849 this->got_irelative_
->current_data_size();
850 this->got_irelative_
->set_current_data_size(got_offset
+ 4);
851 Reloc_section
* rel
= this->rel_irelative(symtab
, layout
);
852 rel
->add_symbolless_global_addend(gsym
, elfcpp::R_386_IRELATIVE
,
853 this->got_irelative_
, got_offset
);
854 struct Global_ifunc gi
;
856 gi
.got_offset
= got_offset
;
857 this->global_ifuncs_
.push_back(gi
);
861 // When setting the PLT offset we skip the initial reserved PLT
863 gsym
->set_plt_offset((this->count_
+ 1) * plt_entry_size
);
867 section_offset_type got_offset
= this->got_plt_
->current_data_size();
869 // Every PLT entry needs a GOT entry which points back to the
870 // PLT entry (this will be changed by the dynamic linker,
871 // normally lazily when the function is called).
872 this->got_plt_
->set_current_data_size(got_offset
+ 4);
874 gsym
->set_needs_dynsym_entry();
875 this->rel_
->add_global(gsym
, elfcpp::R_386_JUMP_SLOT
, this->got_plt_
,
879 // Note that we don't need to save the symbol. The contents of the
880 // PLT are independent of which symbols are used. The symbols only
881 // appear in the relocations.
884 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
888 Output_data_plt_i386::add_local_ifunc_entry(
889 Symbol_table
* symtab
,
891 Sized_relobj_file
<32, false>* relobj
,
892 unsigned int local_sym_index
)
894 unsigned int plt_offset
= this->irelative_count_
* plt_entry_size
;
895 ++this->irelative_count_
;
897 section_offset_type got_offset
= this->got_irelative_
->current_data_size();
899 // Every PLT entry needs a GOT entry which points back to the PLT
901 this->got_irelative_
->set_current_data_size(got_offset
+ 4);
903 // Every PLT entry needs a reloc.
904 Reloc_section
* rel
= this->rel_irelative(symtab
, layout
);
905 rel
->add_symbolless_local_addend(relobj
, local_sym_index
,
906 elfcpp::R_386_IRELATIVE
,
907 this->got_irelative_
, got_offset
);
909 struct Local_ifunc li
;
911 li
.local_sym_index
= local_sym_index
;
912 li
.got_offset
= got_offset
;
913 this->local_ifuncs_
.push_back(li
);
918 // Return where the TLS_DESC relocations should go, creating it if
919 // necessary. These follow the JUMP_SLOT relocations.
921 Output_data_plt_i386::Reloc_section
*
922 Output_data_plt_i386::rel_tls_desc(Layout
* layout
)
924 if (this->tls_desc_rel_
== NULL
)
926 this->tls_desc_rel_
= new Reloc_section(false);
927 layout
->add_output_section_data(".rel.plt", elfcpp::SHT_REL
,
928 elfcpp::SHF_ALLOC
, this->tls_desc_rel_
,
929 ORDER_DYNAMIC_PLT_RELOCS
, false);
930 gold_assert(this->tls_desc_rel_
->output_section()
931 == this->rel_
->output_section());
933 return this->tls_desc_rel_
;
936 // Return where the IRELATIVE relocations should go in the PLT. These
937 // follow the JUMP_SLOT and TLS_DESC relocations.
939 Output_data_plt_i386::Reloc_section
*
940 Output_data_plt_i386::rel_irelative(Symbol_table
* symtab
, Layout
* layout
)
942 if (this->irelative_rel_
== NULL
)
944 // Make sure we have a place for the TLS_DESC relocations, in
945 // case we see any later on.
946 this->rel_tls_desc(layout
);
947 this->irelative_rel_
= new Reloc_section(false);
948 layout
->add_output_section_data(".rel.plt", elfcpp::SHT_REL
,
949 elfcpp::SHF_ALLOC
, this->irelative_rel_
,
950 ORDER_DYNAMIC_PLT_RELOCS
, false);
951 gold_assert(this->irelative_rel_
->output_section()
952 == this->rel_
->output_section());
954 if (parameters
->doing_static_link())
956 // A statically linked executable will only have a .rel.plt
957 // section to hold R_386_IRELATIVE relocs for STT_GNU_IFUNC
958 // symbols. The library will use these symbols to locate
959 // the IRELATIVE relocs at program startup time.
960 symtab
->define_in_output_data("__rel_iplt_start", NULL
,
961 Symbol_table::PREDEFINED
,
962 this->irelative_rel_
, 0, 0,
963 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
964 elfcpp::STV_HIDDEN
, 0, false, true);
965 symtab
->define_in_output_data("__rel_iplt_end", NULL
,
966 Symbol_table::PREDEFINED
,
967 this->irelative_rel_
, 0, 0,
968 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
969 elfcpp::STV_HIDDEN
, 0, true, true);
972 return this->irelative_rel_
;
975 // Return the PLT address to use for a global symbol.
978 Output_data_plt_i386::address_for_global(const Symbol
* gsym
)
981 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
982 && gsym
->can_use_relative_reloc(false))
983 offset
= (this->count_
+ 1) * plt_entry_size
;
984 return this->address() + offset
;
987 // Return the PLT address to use for a local symbol. These are always
991 Output_data_plt_i386::address_for_local(const Relobj
*, unsigned int)
993 return this->address() + (this->count_
+ 1) * plt_entry_size
;
996 // The first entry in the PLT for an executable.
998 const unsigned char Output_data_plt_i386::exec_first_plt_entry
[plt_entry_size
] =
1000 0xff, 0x35, // pushl contents of memory address
1001 0, 0, 0, 0, // replaced with address of .got + 4
1002 0xff, 0x25, // jmp indirect
1003 0, 0, 0, 0, // replaced with address of .got + 8
1004 0, 0, 0, 0 // unused
1007 // The first entry in the PLT for a shared object.
1009 const unsigned char Output_data_plt_i386::dyn_first_plt_entry
[plt_entry_size
] =
1011 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx)
1012 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx)
1013 0, 0, 0, 0 // unused
1016 // Subsequent entries in the PLT for an executable.
1018 const unsigned char Output_data_plt_i386::exec_plt_entry
[plt_entry_size
] =
1020 0xff, 0x25, // jmp indirect
1021 0, 0, 0, 0, // replaced with address of symbol in .got
1022 0x68, // pushl immediate
1023 0, 0, 0, 0, // replaced with offset into relocation table
1024 0xe9, // jmp relative
1025 0, 0, 0, 0 // replaced with offset to start of .plt
1028 // Subsequent entries in the PLT for a shared object.
1030 const unsigned char Output_data_plt_i386::dyn_plt_entry
[plt_entry_size
] =
1032 0xff, 0xa3, // jmp *offset(%ebx)
1033 0, 0, 0, 0, // replaced with offset of symbol in .got
1034 0x68, // pushl immediate
1035 0, 0, 0, 0, // replaced with offset into relocation table
1036 0xe9, // jmp relative
1037 0, 0, 0, 0 // replaced with offset to start of .plt
1040 // The .eh_frame unwind information for the PLT.
1043 Output_data_plt_i386::plt_eh_frame_cie
[plt_eh_frame_cie_size
] =
1046 'z', // Augmentation: augmentation size included.
1047 'R', // Augmentation: FDE encoding included.
1048 '\0', // End of augmentation string.
1049 1, // Code alignment factor.
1050 0x7c, // Data alignment factor.
1051 8, // Return address column.
1052 1, // Augmentation size.
1053 (elfcpp::DW_EH_PE_pcrel
// FDE encoding.
1054 | elfcpp::DW_EH_PE_sdata4
),
1055 elfcpp::DW_CFA_def_cfa
, 4, 4, // DW_CFA_def_cfa: r4 (esp) ofs 4.
1056 elfcpp::DW_CFA_offset
+ 8, 1, // DW_CFA_offset: r8 (eip) at cfa-4.
1057 elfcpp::DW_CFA_nop
, // Align to 16 bytes.
1062 Output_data_plt_i386::plt_eh_frame_fde
[plt_eh_frame_fde_size
] =
1064 0, 0, 0, 0, // Replaced with offset to .plt.
1065 0, 0, 0, 0, // Replaced with size of .plt.
1066 0, // Augmentation size.
1067 elfcpp::DW_CFA_def_cfa_offset
, 8, // DW_CFA_def_cfa_offset: 8.
1068 elfcpp::DW_CFA_advance_loc
+ 6, // Advance 6 to __PLT__ + 6.
1069 elfcpp::DW_CFA_def_cfa_offset
, 12, // DW_CFA_def_cfa_offset: 12.
1070 elfcpp::DW_CFA_advance_loc
+ 10, // Advance 10 to __PLT__ + 16.
1071 elfcpp::DW_CFA_def_cfa_expression
, // DW_CFA_def_cfa_expression.
1072 11, // Block length.
1073 elfcpp::DW_OP_breg4
, 4, // Push %esp + 4.
1074 elfcpp::DW_OP_breg8
, 0, // Push %eip.
1075 elfcpp::DW_OP_lit15
, // Push 0xf.
1076 elfcpp::DW_OP_and
, // & (%eip & 0xf).
1077 elfcpp::DW_OP_lit11
, // Push 0xb.
1078 elfcpp::DW_OP_ge
, // >= ((%eip & 0xf) >= 0xb)
1079 elfcpp::DW_OP_lit2
, // Push 2.
1080 elfcpp::DW_OP_shl
, // << (((%eip & 0xf) >= 0xb) << 2)
1081 elfcpp::DW_OP_plus
, // + ((((%eip&0xf)>=0xb)<<2)+%esp+4
1082 elfcpp::DW_CFA_nop
, // Align to 32 bytes.
1088 // Write out the PLT. This uses the hand-coded instructions above,
1089 // and adjusts them as needed. This is all specified by the i386 ELF
1090 // Processor Supplement.
1093 Output_data_plt_i386::do_write(Output_file
* of
)
1095 const off_t offset
= this->offset();
1096 const section_size_type oview_size
=
1097 convert_to_section_size_type(this->data_size());
1098 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
1100 const off_t got_file_offset
= this->got_plt_
->offset();
1101 gold_assert(parameters
->incremental_update()
1102 || (got_file_offset
+ this->got_plt_
->data_size()
1103 == this->got_irelative_
->offset()));
1104 const section_size_type got_size
=
1105 convert_to_section_size_type(this->got_plt_
->data_size()
1106 + this->got_irelative_
->data_size());
1107 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
1110 unsigned char* pov
= oview
;
1112 elfcpp::Elf_types
<32>::Elf_Addr plt_address
= this->address();
1113 elfcpp::Elf_types
<32>::Elf_Addr got_address
= this->got_plt_
->address();
1115 if (parameters
->options().output_is_position_independent())
1116 memcpy(pov
, dyn_first_plt_entry
, plt_entry_size
);
1119 memcpy(pov
, exec_first_plt_entry
, plt_entry_size
);
1120 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2, got_address
+ 4);
1121 elfcpp::Swap
<32, false>::writeval(pov
+ 8, got_address
+ 8);
1123 pov
+= plt_entry_size
;
1125 unsigned char* got_pov
= got_view
;
1127 memset(got_pov
, 0, 12);
1130 const int rel_size
= elfcpp::Elf_sizes
<32>::rel_size
;
1132 unsigned int plt_offset
= plt_entry_size
;
1133 unsigned int plt_rel_offset
= 0;
1134 unsigned int got_offset
= 12;
1135 const unsigned int count
= this->count_
+ this->irelative_count_
;
1136 for (unsigned int i
= 0;
1139 pov
+= plt_entry_size
,
1141 plt_offset
+= plt_entry_size
,
1142 plt_rel_offset
+= rel_size
,
1145 // Set and adjust the PLT entry itself.
1147 if (parameters
->options().output_is_position_independent())
1149 memcpy(pov
, dyn_plt_entry
, plt_entry_size
);
1150 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2, got_offset
);
1154 memcpy(pov
, exec_plt_entry
, plt_entry_size
);
1155 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
1160 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 7, plt_rel_offset
);
1161 elfcpp::Swap
<32, false>::writeval(pov
+ 12,
1162 - (plt_offset
+ plt_entry_size
));
1164 // Set the entry in the GOT.
1165 elfcpp::Swap
<32, false>::writeval(got_pov
, plt_address
+ plt_offset
+ 6);
1168 // If any STT_GNU_IFUNC symbols have PLT entries, we need to change
1169 // the GOT to point to the actual symbol value, rather than point to
1170 // the PLT entry. That will let the dynamic linker call the right
1171 // function when resolving IRELATIVE relocations.
1172 unsigned char* got_irelative_view
= got_view
+ this->got_plt_
->data_size();
1173 for (std::vector
<Global_ifunc
>::const_iterator p
=
1174 this->global_ifuncs_
.begin();
1175 p
!= this->global_ifuncs_
.end();
1178 const Sized_symbol
<32>* ssym
=
1179 static_cast<const Sized_symbol
<32>*>(p
->sym
);
1180 elfcpp::Swap
<32, false>::writeval(got_irelative_view
+ p
->got_offset
,
1184 for (std::vector
<Local_ifunc
>::const_iterator p
=
1185 this->local_ifuncs_
.begin();
1186 p
!= this->local_ifuncs_
.end();
1189 const Symbol_value
<32>* psymval
=
1190 p
->object
->local_symbol(p
->local_sym_index
);
1191 elfcpp::Swap
<32, false>::writeval(got_irelative_view
+ p
->got_offset
,
1192 psymval
->value(p
->object
, 0));
1195 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
1196 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
1198 of
->write_output_view(offset
, oview_size
, oview
);
1199 of
->write_output_view(got_file_offset
, got_size
, got_view
);
1202 // Create the PLT section.
1205 Target_i386::make_plt_section(Symbol_table
* symtab
, Layout
* layout
)
1207 if (this->plt_
== NULL
)
1209 // Create the GOT sections first.
1210 this->got_section(symtab
, layout
);
1212 this->plt_
= new Output_data_plt_i386(layout
, this->got_plt_
,
1213 this->got_irelative_
);
1214 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
1216 | elfcpp::SHF_EXECINSTR
),
1217 this->plt_
, ORDER_PLT
, false);
1219 // Make the sh_info field of .rel.plt point to .plt.
1220 Output_section
* rel_plt_os
= this->plt_
->rel_plt()->output_section();
1221 rel_plt_os
->set_info_section(this->plt_
->output_section());
1225 // Create a PLT entry for a global symbol.
1228 Target_i386::make_plt_entry(Symbol_table
* symtab
, Layout
* layout
, Symbol
* gsym
)
1230 if (gsym
->has_plt_offset())
1232 if (this->plt_
== NULL
)
1233 this->make_plt_section(symtab
, layout
);
1234 this->plt_
->add_entry(symtab
, layout
, gsym
);
1237 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
1240 Target_i386::make_local_ifunc_plt_entry(Symbol_table
* symtab
, Layout
* layout
,
1241 Sized_relobj_file
<32, false>* relobj
,
1242 unsigned int local_sym_index
)
1244 if (relobj
->local_has_plt_offset(local_sym_index
))
1246 if (this->plt_
== NULL
)
1247 this->make_plt_section(symtab
, layout
);
1248 unsigned int plt_offset
= this->plt_
->add_local_ifunc_entry(symtab
, layout
,
1251 relobj
->set_local_plt_offset(local_sym_index
, plt_offset
);
1254 // Return the number of entries in the PLT.
1257 Target_i386::plt_entry_count() const
1259 if (this->plt_
== NULL
)
1261 return this->plt_
->entry_count();
1264 // Return the offset of the first non-reserved PLT entry.
1267 Target_i386::first_plt_entry_offset() const
1269 return Output_data_plt_i386::first_plt_entry_offset();
1272 // Return the size of each PLT entry.
1275 Target_i386::plt_entry_size() const
1277 return Output_data_plt_i386::get_plt_entry_size();
1280 // Get the section to use for TLS_DESC relocations.
1282 Target_i386::Reloc_section
*
1283 Target_i386::rel_tls_desc_section(Layout
* layout
) const
1285 return this->plt_section()->rel_tls_desc(layout
);
1288 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
1291 Target_i386::define_tls_base_symbol(Symbol_table
* symtab
, Layout
* layout
)
1293 if (this->tls_base_symbol_defined_
)
1296 Output_segment
* tls_segment
= layout
->tls_segment();
1297 if (tls_segment
!= NULL
)
1299 bool is_exec
= parameters
->options().output_is_executable();
1300 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
1301 Symbol_table::PREDEFINED
,
1305 elfcpp::STV_HIDDEN
, 0,
1307 ? Symbol::SEGMENT_END
1308 : Symbol::SEGMENT_START
),
1311 this->tls_base_symbol_defined_
= true;
1314 // Create a GOT entry for the TLS module index.
1317 Target_i386::got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
1318 Sized_relobj_file
<32, false>* object
)
1320 if (this->got_mod_index_offset_
== -1U)
1322 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
1323 Reloc_section
* rel_dyn
= this->rel_dyn_section(layout
);
1324 Output_data_got
<32, false>* got
= this->got_section(symtab
, layout
);
1325 unsigned int got_offset
= got
->add_constant(0);
1326 rel_dyn
->add_local(object
, 0, elfcpp::R_386_TLS_DTPMOD32
, got
,
1328 got
->add_constant(0);
1329 this->got_mod_index_offset_
= got_offset
;
1331 return this->got_mod_index_offset_
;
1334 // Optimize the TLS relocation type based on what we know about the
1335 // symbol. IS_FINAL is true if the final address of this symbol is
1336 // known at link time.
1338 tls::Tls_optimization
1339 Target_i386::optimize_tls_reloc(bool is_final
, int r_type
)
1341 // If we are generating a shared library, then we can't do anything
1343 if (parameters
->options().shared())
1344 return tls::TLSOPT_NONE
;
1348 case elfcpp::R_386_TLS_GD
:
1349 case elfcpp::R_386_TLS_GOTDESC
:
1350 case elfcpp::R_386_TLS_DESC_CALL
:
1351 // These are General-Dynamic which permits fully general TLS
1352 // access. Since we know that we are generating an executable,
1353 // we can convert this to Initial-Exec. If we also know that
1354 // this is a local symbol, we can further switch to Local-Exec.
1356 return tls::TLSOPT_TO_LE
;
1357 return tls::TLSOPT_TO_IE
;
1359 case elfcpp::R_386_TLS_LDM
:
1360 // This is Local-Dynamic, which refers to a local symbol in the
1361 // dynamic TLS block. Since we know that we generating an
1362 // executable, we can switch to Local-Exec.
1363 return tls::TLSOPT_TO_LE
;
1365 case elfcpp::R_386_TLS_LDO_32
:
1366 // Another type of Local-Dynamic relocation.
1367 return tls::TLSOPT_TO_LE
;
1369 case elfcpp::R_386_TLS_IE
:
1370 case elfcpp::R_386_TLS_GOTIE
:
1371 case elfcpp::R_386_TLS_IE_32
:
1372 // These are Initial-Exec relocs which get the thread offset
1373 // from the GOT. If we know that we are linking against the
1374 // local symbol, we can switch to Local-Exec, which links the
1375 // thread offset into the instruction.
1377 return tls::TLSOPT_TO_LE
;
1378 return tls::TLSOPT_NONE
;
1380 case elfcpp::R_386_TLS_LE
:
1381 case elfcpp::R_386_TLS_LE_32
:
1382 // When we already have Local-Exec, there is nothing further we
1384 return tls::TLSOPT_NONE
;
1391 // Get the Reference_flags for a particular relocation.
1394 Target_i386::Scan::get_reference_flags(unsigned int r_type
)
1398 case elfcpp::R_386_NONE
:
1399 case elfcpp::R_386_GNU_VTINHERIT
:
1400 case elfcpp::R_386_GNU_VTENTRY
:
1401 case elfcpp::R_386_GOTPC
:
1402 // No symbol reference.
1405 case elfcpp::R_386_32
:
1406 case elfcpp::R_386_16
:
1407 case elfcpp::R_386_8
:
1408 return Symbol::ABSOLUTE_REF
;
1410 case elfcpp::R_386_PC32
:
1411 case elfcpp::R_386_PC16
:
1412 case elfcpp::R_386_PC8
:
1413 case elfcpp::R_386_GOTOFF
:
1414 return Symbol::RELATIVE_REF
;
1416 case elfcpp::R_386_PLT32
:
1417 return Symbol::FUNCTION_CALL
| Symbol::RELATIVE_REF
;
1419 case elfcpp::R_386_GOT32
:
1421 return Symbol::ABSOLUTE_REF
;
1423 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1424 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
1425 case elfcpp::R_386_TLS_DESC_CALL
:
1426 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1427 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1428 case elfcpp::R_386_TLS_IE
: // Initial-exec
1429 case elfcpp::R_386_TLS_IE_32
:
1430 case elfcpp::R_386_TLS_GOTIE
:
1431 case elfcpp::R_386_TLS_LE
: // Local-exec
1432 case elfcpp::R_386_TLS_LE_32
:
1433 return Symbol::TLS_REF
;
1435 case elfcpp::R_386_COPY
:
1436 case elfcpp::R_386_GLOB_DAT
:
1437 case elfcpp::R_386_JUMP_SLOT
:
1438 case elfcpp::R_386_RELATIVE
:
1439 case elfcpp::R_386_IRELATIVE
:
1440 case elfcpp::R_386_TLS_TPOFF
:
1441 case elfcpp::R_386_TLS_DTPMOD32
:
1442 case elfcpp::R_386_TLS_DTPOFF32
:
1443 case elfcpp::R_386_TLS_TPOFF32
:
1444 case elfcpp::R_386_TLS_DESC
:
1445 case elfcpp::R_386_32PLT
:
1446 case elfcpp::R_386_TLS_GD_32
:
1447 case elfcpp::R_386_TLS_GD_PUSH
:
1448 case elfcpp::R_386_TLS_GD_CALL
:
1449 case elfcpp::R_386_TLS_GD_POP
:
1450 case elfcpp::R_386_TLS_LDM_32
:
1451 case elfcpp::R_386_TLS_LDM_PUSH
:
1452 case elfcpp::R_386_TLS_LDM_CALL
:
1453 case elfcpp::R_386_TLS_LDM_POP
:
1454 case elfcpp::R_386_USED_BY_INTEL_200
:
1456 // Not expected. We will give an error later.
1461 // Report an unsupported relocation against a local symbol.
1464 Target_i386::Scan::unsupported_reloc_local(Sized_relobj_file
<32, false>* object
,
1465 unsigned int r_type
)
1467 gold_error(_("%s: unsupported reloc %u against local symbol"),
1468 object
->name().c_str(), r_type
);
1471 // Return whether we need to make a PLT entry for a relocation of a
1472 // given type against a STT_GNU_IFUNC symbol.
1475 Target_i386::Scan::reloc_needs_plt_for_ifunc(
1476 Sized_relobj_file
<32, false>* object
,
1477 unsigned int r_type
)
1479 int flags
= Scan::get_reference_flags(r_type
);
1480 if (flags
& Symbol::TLS_REF
)
1481 gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"),
1482 object
->name().c_str(), r_type
);
1486 // Scan a relocation for a local symbol.
1489 Target_i386::Scan::local(Symbol_table
* symtab
,
1491 Target_i386
* target
,
1492 Sized_relobj_file
<32, false>* object
,
1493 unsigned int data_shndx
,
1494 Output_section
* output_section
,
1495 const elfcpp::Rel
<32, false>& reloc
,
1496 unsigned int r_type
,
1497 const elfcpp::Sym
<32, false>& lsym
)
1499 // A local STT_GNU_IFUNC symbol may require a PLT entry.
1500 if (lsym
.get_st_type() == elfcpp::STT_GNU_IFUNC
1501 && this->reloc_needs_plt_for_ifunc(object
, r_type
))
1503 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1504 target
->make_local_ifunc_plt_entry(symtab
, layout
, object
, r_sym
);
1509 case elfcpp::R_386_NONE
:
1510 case elfcpp::R_386_GNU_VTINHERIT
:
1511 case elfcpp::R_386_GNU_VTENTRY
:
1514 case elfcpp::R_386_32
:
1515 // If building a shared library (or a position-independent
1516 // executable), we need to create a dynamic relocation for
1517 // this location. The relocation applied at link time will
1518 // apply the link-time value, so we flag the location with
1519 // an R_386_RELATIVE relocation so the dynamic loader can
1520 // relocate it easily.
1521 if (parameters
->options().output_is_position_independent())
1523 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1524 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1525 rel_dyn
->add_local_relative(object
, r_sym
, elfcpp::R_386_RELATIVE
,
1526 output_section
, data_shndx
,
1527 reloc
.get_r_offset());
1531 case elfcpp::R_386_16
:
1532 case elfcpp::R_386_8
:
1533 // If building a shared library (or a position-independent
1534 // executable), we need to create a dynamic relocation for
1535 // this location. Because the addend needs to remain in the
1536 // data section, we need to be careful not to apply this
1537 // relocation statically.
1538 if (parameters
->options().output_is_position_independent())
1540 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1541 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1542 if (lsym
.get_st_type() != elfcpp::STT_SECTION
)
1543 rel_dyn
->add_local(object
, r_sym
, r_type
, output_section
,
1544 data_shndx
, reloc
.get_r_offset());
1547 gold_assert(lsym
.get_st_value() == 0);
1548 unsigned int shndx
= lsym
.get_st_shndx();
1550 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
,
1553 object
->error(_("section symbol %u has bad shndx %u"),
1556 rel_dyn
->add_local_section(object
, shndx
,
1557 r_type
, output_section
,
1558 data_shndx
, reloc
.get_r_offset());
1563 case elfcpp::R_386_PC32
:
1564 case elfcpp::R_386_PC16
:
1565 case elfcpp::R_386_PC8
:
1568 case elfcpp::R_386_PLT32
:
1569 // Since we know this is a local symbol, we can handle this as a
1573 case elfcpp::R_386_GOTOFF
:
1574 case elfcpp::R_386_GOTPC
:
1575 // We need a GOT section.
1576 target
->got_section(symtab
, layout
);
1579 case elfcpp::R_386_GOT32
:
1581 // The symbol requires a GOT entry.
1582 Output_data_got
<32, false>* got
= target
->got_section(symtab
, layout
);
1583 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1585 // For a STT_GNU_IFUNC symbol we want the PLT offset. That
1586 // lets function pointers compare correctly with shared
1587 // libraries. Otherwise we would need an IRELATIVE reloc.
1589 if (lsym
.get_st_type() == elfcpp::STT_GNU_IFUNC
)
1590 is_new
= got
->add_local_plt(object
, r_sym
, GOT_TYPE_STANDARD
);
1592 is_new
= got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
);
1595 // If we are generating a shared object, we need to add a
1596 // dynamic RELATIVE relocation for this symbol's GOT entry.
1597 if (parameters
->options().output_is_position_independent())
1599 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1600 unsigned int got_offset
=
1601 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
);
1602 rel_dyn
->add_local_relative(object
, r_sym
,
1603 elfcpp::R_386_RELATIVE
,
1610 // These are relocations which should only be seen by the
1611 // dynamic linker, and should never be seen here.
1612 case elfcpp::R_386_COPY
:
1613 case elfcpp::R_386_GLOB_DAT
:
1614 case elfcpp::R_386_JUMP_SLOT
:
1615 case elfcpp::R_386_RELATIVE
:
1616 case elfcpp::R_386_IRELATIVE
:
1617 case elfcpp::R_386_TLS_TPOFF
:
1618 case elfcpp::R_386_TLS_DTPMOD32
:
1619 case elfcpp::R_386_TLS_DTPOFF32
:
1620 case elfcpp::R_386_TLS_TPOFF32
:
1621 case elfcpp::R_386_TLS_DESC
:
1622 gold_error(_("%s: unexpected reloc %u in object file"),
1623 object
->name().c_str(), r_type
);
1626 // These are initial TLS relocs, which are expected when
1628 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1629 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
1630 case elfcpp::R_386_TLS_DESC_CALL
:
1631 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1632 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1633 case elfcpp::R_386_TLS_IE
: // Initial-exec
1634 case elfcpp::R_386_TLS_IE_32
:
1635 case elfcpp::R_386_TLS_GOTIE
:
1636 case elfcpp::R_386_TLS_LE
: // Local-exec
1637 case elfcpp::R_386_TLS_LE_32
:
1639 bool output_is_shared
= parameters
->options().shared();
1640 const tls::Tls_optimization optimized_type
1641 = Target_i386::optimize_tls_reloc(!output_is_shared
, r_type
);
1644 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1645 if (optimized_type
== tls::TLSOPT_NONE
)
1647 // Create a pair of GOT entries for the module index and
1648 // dtv-relative offset.
1649 Output_data_got
<32, false>* got
1650 = target
->got_section(symtab
, layout
);
1651 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1652 unsigned int shndx
= lsym
.get_st_shndx();
1654 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
1656 object
->error(_("local symbol %u has bad shndx %u"),
1659 got
->add_local_pair_with_rel(object
, r_sym
, shndx
,
1661 target
->rel_dyn_section(layout
),
1662 elfcpp::R_386_TLS_DTPMOD32
, 0);
1664 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1665 unsupported_reloc_local(object
, r_type
);
1668 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva)
1669 target
->define_tls_base_symbol(symtab
, layout
);
1670 if (optimized_type
== tls::TLSOPT_NONE
)
1672 // Create a double GOT entry with an R_386_TLS_DESC
1673 // reloc. The R_386_TLS_DESC reloc is resolved
1674 // lazily, so the GOT entry needs to be in an area in
1675 // .got.plt, not .got. Call got_section to make sure
1676 // the section has been created.
1677 target
->got_section(symtab
, layout
);
1678 Output_data_got
<32, false>* got
= target
->got_tlsdesc_section();
1679 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1680 if (!object
->local_has_got_offset(r_sym
, GOT_TYPE_TLS_DESC
))
1682 unsigned int got_offset
= got
->add_constant(0);
1683 // The local symbol value is stored in the second
1685 got
->add_local(object
, r_sym
, GOT_TYPE_TLS_DESC
);
1686 // That set the GOT offset of the local symbol to
1687 // point to the second entry, but we want it to
1688 // point to the first.
1689 object
->set_local_got_offset(r_sym
, GOT_TYPE_TLS_DESC
,
1691 Reloc_section
* rt
= target
->rel_tls_desc_section(layout
);
1692 rt
->add_absolute(elfcpp::R_386_TLS_DESC
, got
, got_offset
);
1695 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1696 unsupported_reloc_local(object
, r_type
);
1699 case elfcpp::R_386_TLS_DESC_CALL
:
1702 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1703 if (optimized_type
== tls::TLSOPT_NONE
)
1705 // Create a GOT entry for the module index.
1706 target
->got_mod_index_entry(symtab
, layout
, object
);
1708 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1709 unsupported_reloc_local(object
, r_type
);
1712 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1715 case elfcpp::R_386_TLS_IE
: // Initial-exec
1716 case elfcpp::R_386_TLS_IE_32
:
1717 case elfcpp::R_386_TLS_GOTIE
:
1718 layout
->set_has_static_tls();
1719 if (optimized_type
== tls::TLSOPT_NONE
)
1721 // For the R_386_TLS_IE relocation, we need to create a
1722 // dynamic relocation when building a shared library.
1723 if (r_type
== elfcpp::R_386_TLS_IE
1724 && parameters
->options().shared())
1726 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1728 = elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1729 rel_dyn
->add_local_relative(object
, r_sym
,
1730 elfcpp::R_386_RELATIVE
,
1731 output_section
, data_shndx
,
1732 reloc
.get_r_offset());
1734 // Create a GOT entry for the tp-relative offset.
1735 Output_data_got
<32, false>* got
1736 = target
->got_section(symtab
, layout
);
1737 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1738 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_IE_32
1739 ? elfcpp::R_386_TLS_TPOFF32
1740 : elfcpp::R_386_TLS_TPOFF
);
1741 unsigned int got_type
= (r_type
== elfcpp::R_386_TLS_IE_32
1742 ? GOT_TYPE_TLS_OFFSET
1743 : GOT_TYPE_TLS_NOFFSET
);
1744 got
->add_local_with_rel(object
, r_sym
, got_type
,
1745 target
->rel_dyn_section(layout
),
1748 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1749 unsupported_reloc_local(object
, r_type
);
1752 case elfcpp::R_386_TLS_LE
: // Local-exec
1753 case elfcpp::R_386_TLS_LE_32
:
1754 layout
->set_has_static_tls();
1755 if (output_is_shared
)
1757 // We need to create a dynamic relocation.
1758 gold_assert(lsym
.get_st_type() != elfcpp::STT_SECTION
);
1759 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1760 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_LE_32
1761 ? elfcpp::R_386_TLS_TPOFF32
1762 : elfcpp::R_386_TLS_TPOFF
);
1763 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1764 rel_dyn
->add_local(object
, r_sym
, dyn_r_type
, output_section
,
1765 data_shndx
, reloc
.get_r_offset());
1775 case elfcpp::R_386_32PLT
:
1776 case elfcpp::R_386_TLS_GD_32
:
1777 case elfcpp::R_386_TLS_GD_PUSH
:
1778 case elfcpp::R_386_TLS_GD_CALL
:
1779 case elfcpp::R_386_TLS_GD_POP
:
1780 case elfcpp::R_386_TLS_LDM_32
:
1781 case elfcpp::R_386_TLS_LDM_PUSH
:
1782 case elfcpp::R_386_TLS_LDM_CALL
:
1783 case elfcpp::R_386_TLS_LDM_POP
:
1784 case elfcpp::R_386_USED_BY_INTEL_200
:
1786 unsupported_reloc_local(object
, r_type
);
1791 // Report an unsupported relocation against a global symbol.
1794 Target_i386::Scan::unsupported_reloc_global(
1795 Sized_relobj_file
<32, false>* object
,
1796 unsigned int r_type
,
1799 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1800 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
1804 Target_i386::Scan::possible_function_pointer_reloc(unsigned int r_type
)
1808 case elfcpp::R_386_32
:
1809 case elfcpp::R_386_16
:
1810 case elfcpp::R_386_8
:
1811 case elfcpp::R_386_GOTOFF
:
1812 case elfcpp::R_386_GOT32
:
1823 Target_i386::Scan::local_reloc_may_be_function_pointer(
1827 Sized_relobj_file
<32, false>* ,
1830 const elfcpp::Rel
<32, false>& ,
1831 unsigned int r_type
,
1832 const elfcpp::Sym
<32, false>&)
1834 return possible_function_pointer_reloc(r_type
);
1838 Target_i386::Scan::global_reloc_may_be_function_pointer(
1842 Sized_relobj_file
<32, false>* ,
1845 const elfcpp::Rel
<32, false>& ,
1846 unsigned int r_type
,
1849 return possible_function_pointer_reloc(r_type
);
1852 // Scan a relocation for a global symbol.
1855 Target_i386::Scan::global(Symbol_table
* symtab
,
1857 Target_i386
* target
,
1858 Sized_relobj_file
<32, false>* object
,
1859 unsigned int data_shndx
,
1860 Output_section
* output_section
,
1861 const elfcpp::Rel
<32, false>& reloc
,
1862 unsigned int r_type
,
1865 // A STT_GNU_IFUNC symbol may require a PLT entry.
1866 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
1867 && this->reloc_needs_plt_for_ifunc(object
, r_type
))
1868 target
->make_plt_entry(symtab
, layout
, gsym
);
1872 case elfcpp::R_386_NONE
:
1873 case elfcpp::R_386_GNU_VTINHERIT
:
1874 case elfcpp::R_386_GNU_VTENTRY
:
1877 case elfcpp::R_386_32
:
1878 case elfcpp::R_386_16
:
1879 case elfcpp::R_386_8
:
1881 // Make a PLT entry if necessary.
1882 if (gsym
->needs_plt_entry())
1884 target
->make_plt_entry(symtab
, layout
, gsym
);
1885 // Since this is not a PC-relative relocation, we may be
1886 // taking the address of a function. In that case we need to
1887 // set the entry in the dynamic symbol table to the address of
1889 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
1890 gsym
->set_needs_dynsym_value();
1892 // Make a dynamic relocation if necessary.
1893 if (gsym
->needs_dynamic_reloc(Scan::get_reference_flags(r_type
)))
1895 if (gsym
->may_need_copy_reloc())
1897 target
->copy_reloc(symtab
, layout
, object
,
1898 data_shndx
, output_section
, gsym
, reloc
);
1900 else if (r_type
== elfcpp::R_386_32
1901 && gsym
->type() == elfcpp::STT_GNU_IFUNC
1902 && gsym
->can_use_relative_reloc(false)
1903 && !gsym
->is_from_dynobj()
1904 && !gsym
->is_undefined()
1905 && !gsym
->is_preemptible())
1907 // Use an IRELATIVE reloc for a locally defined
1908 // STT_GNU_IFUNC symbol. This makes a function
1909 // address in a PIE executable match the address in a
1910 // shared library that it links against.
1911 Reloc_section
* rel_dyn
= target
->rel_irelative_section(layout
);
1912 rel_dyn
->add_symbolless_global_addend(gsym
,
1913 elfcpp::R_386_IRELATIVE
,
1916 reloc
.get_r_offset());
1918 else if (r_type
== elfcpp::R_386_32
1919 && gsym
->can_use_relative_reloc(false))
1921 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1922 rel_dyn
->add_global_relative(gsym
, elfcpp::R_386_RELATIVE
,
1923 output_section
, object
,
1924 data_shndx
, reloc
.get_r_offset());
1928 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1929 rel_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1930 data_shndx
, reloc
.get_r_offset());
1936 case elfcpp::R_386_PC32
:
1937 case elfcpp::R_386_PC16
:
1938 case elfcpp::R_386_PC8
:
1940 // Make a PLT entry if necessary.
1941 if (gsym
->needs_plt_entry())
1943 // These relocations are used for function calls only in
1944 // non-PIC code. For a 32-bit relocation in a shared library,
1945 // we'll need a text relocation anyway, so we can skip the
1946 // PLT entry and let the dynamic linker bind the call directly
1947 // to the target. For smaller relocations, we should use a
1948 // PLT entry to ensure that the call can reach.
1949 if (!parameters
->options().shared()
1950 || r_type
!= elfcpp::R_386_PC32
)
1951 target
->make_plt_entry(symtab
, layout
, gsym
);
1953 // Make a dynamic relocation if necessary.
1954 if (gsym
->needs_dynamic_reloc(Scan::get_reference_flags(r_type
)))
1956 if (gsym
->may_need_copy_reloc())
1958 target
->copy_reloc(symtab
, layout
, object
,
1959 data_shndx
, output_section
, gsym
, reloc
);
1963 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1964 rel_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1965 data_shndx
, reloc
.get_r_offset());
1971 case elfcpp::R_386_GOT32
:
1973 // The symbol requires a GOT entry.
1974 Output_data_got
<32, false>* got
= target
->got_section(symtab
, layout
);
1975 if (gsym
->final_value_is_known())
1977 // For a STT_GNU_IFUNC symbol we want the PLT address.
1978 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
1979 got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
1981 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
1985 // If this symbol is not fully resolved, we need to add a
1986 // GOT entry with a dynamic relocation.
1987 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1988 if (gsym
->is_from_dynobj()
1989 || gsym
->is_undefined()
1990 || gsym
->is_preemptible()
1991 || (gsym
->type() == elfcpp::STT_GNU_IFUNC
1992 && parameters
->options().output_is_position_independent()))
1993 got
->add_global_with_rel(gsym
, GOT_TYPE_STANDARD
,
1994 rel_dyn
, elfcpp::R_386_GLOB_DAT
);
1997 // For a STT_GNU_IFUNC symbol we want to write the PLT
1998 // offset into the GOT, so that function pointer
1999 // comparisons work correctly.
2001 if (gsym
->type() != elfcpp::STT_GNU_IFUNC
)
2002 is_new
= got
->add_global(gsym
, GOT_TYPE_STANDARD
);
2005 is_new
= got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
2006 // Tell the dynamic linker to use the PLT address
2007 // when resolving relocations.
2008 if (gsym
->is_from_dynobj()
2009 && !parameters
->options().shared())
2010 gsym
->set_needs_dynsym_value();
2014 unsigned int got_off
= gsym
->got_offset(GOT_TYPE_STANDARD
);
2015 rel_dyn
->add_global_relative(gsym
, elfcpp::R_386_RELATIVE
,
2023 case elfcpp::R_386_PLT32
:
2024 // If the symbol is fully resolved, this is just a PC32 reloc.
2025 // Otherwise we need a PLT entry.
2026 if (gsym
->final_value_is_known())
2028 // If building a shared library, we can also skip the PLT entry
2029 // if the symbol is defined in the output file and is protected
2031 if (gsym
->is_defined()
2032 && !gsym
->is_from_dynobj()
2033 && !gsym
->is_preemptible())
2035 target
->make_plt_entry(symtab
, layout
, gsym
);
2038 case elfcpp::R_386_GOTOFF
:
2039 case elfcpp::R_386_GOTPC
:
2040 // We need a GOT section.
2041 target
->got_section(symtab
, layout
);
2044 // These are relocations which should only be seen by the
2045 // dynamic linker, and should never be seen here.
2046 case elfcpp::R_386_COPY
:
2047 case elfcpp::R_386_GLOB_DAT
:
2048 case elfcpp::R_386_JUMP_SLOT
:
2049 case elfcpp::R_386_RELATIVE
:
2050 case elfcpp::R_386_IRELATIVE
:
2051 case elfcpp::R_386_TLS_TPOFF
:
2052 case elfcpp::R_386_TLS_DTPMOD32
:
2053 case elfcpp::R_386_TLS_DTPOFF32
:
2054 case elfcpp::R_386_TLS_TPOFF32
:
2055 case elfcpp::R_386_TLS_DESC
:
2056 gold_error(_("%s: unexpected reloc %u in object file"),
2057 object
->name().c_str(), r_type
);
2060 // These are initial tls relocs, which are expected when
2062 case elfcpp::R_386_TLS_GD
: // Global-dynamic
2063 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
2064 case elfcpp::R_386_TLS_DESC_CALL
:
2065 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
2066 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
2067 case elfcpp::R_386_TLS_IE
: // Initial-exec
2068 case elfcpp::R_386_TLS_IE_32
:
2069 case elfcpp::R_386_TLS_GOTIE
:
2070 case elfcpp::R_386_TLS_LE
: // Local-exec
2071 case elfcpp::R_386_TLS_LE_32
:
2073 const bool is_final
= gsym
->final_value_is_known();
2074 const tls::Tls_optimization optimized_type
2075 = Target_i386::optimize_tls_reloc(is_final
, r_type
);
2078 case elfcpp::R_386_TLS_GD
: // Global-dynamic
2079 if (optimized_type
== tls::TLSOPT_NONE
)
2081 // Create a pair of GOT entries for the module index and
2082 // dtv-relative offset.
2083 Output_data_got
<32, false>* got
2084 = target
->got_section(symtab
, layout
);
2085 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_PAIR
,
2086 target
->rel_dyn_section(layout
),
2087 elfcpp::R_386_TLS_DTPMOD32
,
2088 elfcpp::R_386_TLS_DTPOFF32
);
2090 else if (optimized_type
== tls::TLSOPT_TO_IE
)
2092 // Create a GOT entry for the tp-relative offset.
2093 Output_data_got
<32, false>* got
2094 = target
->got_section(symtab
, layout
);
2095 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_NOFFSET
,
2096 target
->rel_dyn_section(layout
),
2097 elfcpp::R_386_TLS_TPOFF
);
2099 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
2100 unsupported_reloc_global(object
, r_type
, gsym
);
2103 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (~oliva url)
2104 target
->define_tls_base_symbol(symtab
, layout
);
2105 if (optimized_type
== tls::TLSOPT_NONE
)
2107 // Create a double GOT entry with an R_386_TLS_DESC
2108 // reloc. The R_386_TLS_DESC reloc is resolved
2109 // lazily, so the GOT entry needs to be in an area in
2110 // .got.plt, not .got. Call got_section to make sure
2111 // the section has been created.
2112 target
->got_section(symtab
, layout
);
2113 Output_data_got
<32, false>* got
= target
->got_tlsdesc_section();
2114 Reloc_section
* rt
= target
->rel_tls_desc_section(layout
);
2115 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_DESC
, rt
,
2116 elfcpp::R_386_TLS_DESC
, 0);
2118 else if (optimized_type
== tls::TLSOPT_TO_IE
)
2120 // Create a GOT entry for the tp-relative offset.
2121 Output_data_got
<32, false>* got
2122 = target
->got_section(symtab
, layout
);
2123 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_NOFFSET
,
2124 target
->rel_dyn_section(layout
),
2125 elfcpp::R_386_TLS_TPOFF
);
2127 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
2128 unsupported_reloc_global(object
, r_type
, gsym
);
2131 case elfcpp::R_386_TLS_DESC_CALL
:
2134 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
2135 if (optimized_type
== tls::TLSOPT_NONE
)
2137 // Create a GOT entry for the module index.
2138 target
->got_mod_index_entry(symtab
, layout
, object
);
2140 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
2141 unsupported_reloc_global(object
, r_type
, gsym
);
2144 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
2147 case elfcpp::R_386_TLS_IE
: // Initial-exec
2148 case elfcpp::R_386_TLS_IE_32
:
2149 case elfcpp::R_386_TLS_GOTIE
:
2150 layout
->set_has_static_tls();
2151 if (optimized_type
== tls::TLSOPT_NONE
)
2153 // For the R_386_TLS_IE relocation, we need to create a
2154 // dynamic relocation when building a shared library.
2155 if (r_type
== elfcpp::R_386_TLS_IE
2156 && parameters
->options().shared())
2158 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
2159 rel_dyn
->add_global_relative(gsym
, elfcpp::R_386_RELATIVE
,
2160 output_section
, object
,
2162 reloc
.get_r_offset());
2164 // Create a GOT entry for the tp-relative offset.
2165 Output_data_got
<32, false>* got
2166 = target
->got_section(symtab
, layout
);
2167 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_IE_32
2168 ? elfcpp::R_386_TLS_TPOFF32
2169 : elfcpp::R_386_TLS_TPOFF
);
2170 unsigned int got_type
= (r_type
== elfcpp::R_386_TLS_IE_32
2171 ? GOT_TYPE_TLS_OFFSET
2172 : GOT_TYPE_TLS_NOFFSET
);
2173 got
->add_global_with_rel(gsym
, got_type
,
2174 target
->rel_dyn_section(layout
),
2177 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
2178 unsupported_reloc_global(object
, r_type
, gsym
);
2181 case elfcpp::R_386_TLS_LE
: // Local-exec
2182 case elfcpp::R_386_TLS_LE_32
:
2183 layout
->set_has_static_tls();
2184 if (parameters
->options().shared())
2186 // We need to create a dynamic relocation.
2187 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_LE_32
2188 ? elfcpp::R_386_TLS_TPOFF32
2189 : elfcpp::R_386_TLS_TPOFF
);
2190 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
2191 rel_dyn
->add_global(gsym
, dyn_r_type
, output_section
, object
,
2192 data_shndx
, reloc
.get_r_offset());
2202 case elfcpp::R_386_32PLT
:
2203 case elfcpp::R_386_TLS_GD_32
:
2204 case elfcpp::R_386_TLS_GD_PUSH
:
2205 case elfcpp::R_386_TLS_GD_CALL
:
2206 case elfcpp::R_386_TLS_GD_POP
:
2207 case elfcpp::R_386_TLS_LDM_32
:
2208 case elfcpp::R_386_TLS_LDM_PUSH
:
2209 case elfcpp::R_386_TLS_LDM_CALL
:
2210 case elfcpp::R_386_TLS_LDM_POP
:
2211 case elfcpp::R_386_USED_BY_INTEL_200
:
2213 unsupported_reloc_global(object
, r_type
, gsym
);
2218 // Process relocations for gc.
2221 Target_i386::gc_process_relocs(Symbol_table
* symtab
,
2223 Sized_relobj_file
<32, false>* object
,
2224 unsigned int data_shndx
,
2226 const unsigned char* prelocs
,
2228 Output_section
* output_section
,
2229 bool needs_special_offset_handling
,
2230 size_t local_symbol_count
,
2231 const unsigned char* plocal_symbols
)
2233 gold::gc_process_relocs
<32, false, Target_i386
, elfcpp::SHT_REL
,
2235 Target_i386::Relocatable_size_for_reloc
>(
2244 needs_special_offset_handling
,
2249 // Scan relocations for a section.
2252 Target_i386::scan_relocs(Symbol_table
* symtab
,
2254 Sized_relobj_file
<32, false>* object
,
2255 unsigned int data_shndx
,
2256 unsigned int sh_type
,
2257 const unsigned char* prelocs
,
2259 Output_section
* output_section
,
2260 bool needs_special_offset_handling
,
2261 size_t local_symbol_count
,
2262 const unsigned char* plocal_symbols
)
2264 if (sh_type
== elfcpp::SHT_RELA
)
2266 gold_error(_("%s: unsupported RELA reloc section"),
2267 object
->name().c_str());
2271 gold::scan_relocs
<32, false, Target_i386
, elfcpp::SHT_REL
,
2281 needs_special_offset_handling
,
2286 // Finalize the sections.
2289 Target_i386::do_finalize_sections(
2291 const Input_objects
*,
2292 Symbol_table
* symtab
)
2294 const Reloc_section
* rel_plt
= (this->plt_
== NULL
2296 : this->plt_
->rel_plt());
2297 layout
->add_target_dynamic_tags(true, this->got_plt_
, rel_plt
,
2298 this->rel_dyn_
, true, false);
2300 // Emit any relocs we saved in an attempt to avoid generating COPY
2302 if (this->copy_relocs_
.any_saved_relocs())
2303 this->copy_relocs_
.emit(this->rel_dyn_section(layout
));
2305 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
2306 // the .got.plt section.
2307 Symbol
* sym
= this->global_offset_table_
;
2310 uint32_t data_size
= this->got_plt_
->current_data_size();
2311 symtab
->get_sized_symbol
<32>(sym
)->set_symsize(data_size
);
2314 if (parameters
->doing_static_link()
2315 && (this->plt_
== NULL
|| !this->plt_
->has_irelative_section()))
2317 // If linking statically, make sure that the __rel_iplt symbols
2318 // were defined if necessary, even if we didn't create a PLT.
2319 static const Define_symbol_in_segment syms
[] =
2322 "__rel_iplt_start", // name
2323 elfcpp::PT_LOAD
, // segment_type
2324 elfcpp::PF_W
, // segment_flags_set
2325 elfcpp::PF(0), // segment_flags_clear
2328 elfcpp::STT_NOTYPE
, // type
2329 elfcpp::STB_GLOBAL
, // binding
2330 elfcpp::STV_HIDDEN
, // visibility
2332 Symbol::SEGMENT_START
, // offset_from_base
2336 "__rel_iplt_end", // name
2337 elfcpp::PT_LOAD
, // segment_type
2338 elfcpp::PF_W
, // segment_flags_set
2339 elfcpp::PF(0), // segment_flags_clear
2342 elfcpp::STT_NOTYPE
, // type
2343 elfcpp::STB_GLOBAL
, // binding
2344 elfcpp::STV_HIDDEN
, // visibility
2346 Symbol::SEGMENT_START
, // offset_from_base
2351 symtab
->define_symbols(layout
, 2, syms
,
2352 layout
->script_options()->saw_sections_clause());
2356 // Return whether a direct absolute static relocation needs to be applied.
2357 // In cases where Scan::local() or Scan::global() has created
2358 // a dynamic relocation other than R_386_RELATIVE, the addend
2359 // of the relocation is carried in the data, and we must not
2360 // apply the static relocation.
2363 Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol
<32>* gsym
,
2364 unsigned int r_type
,
2366 Output_section
* output_section
)
2368 // If the output section is not allocated, then we didn't call
2369 // scan_relocs, we didn't create a dynamic reloc, and we must apply
2371 if ((output_section
->flags() & elfcpp::SHF_ALLOC
) == 0)
2374 int ref_flags
= Scan::get_reference_flags(r_type
);
2376 // For local symbols, we will have created a non-RELATIVE dynamic
2377 // relocation only if (a) the output is position independent,
2378 // (b) the relocation is absolute (not pc- or segment-relative), and
2379 // (c) the relocation is not 32 bits wide.
2381 return !(parameters
->options().output_is_position_independent()
2382 && (ref_flags
& Symbol::ABSOLUTE_REF
)
2385 // For global symbols, we use the same helper routines used in the
2386 // scan pass. If we did not create a dynamic relocation, or if we
2387 // created a RELATIVE dynamic relocation, we should apply the static
2389 bool has_dyn
= gsym
->needs_dynamic_reloc(ref_flags
);
2390 bool is_rel
= (ref_flags
& Symbol::ABSOLUTE_REF
)
2391 && gsym
->can_use_relative_reloc(ref_flags
2392 & Symbol::FUNCTION_CALL
);
2393 return !has_dyn
|| is_rel
;
2396 // Perform a relocation.
2399 Target_i386::Relocate::relocate(const Relocate_info
<32, false>* relinfo
,
2400 Target_i386
* target
,
2401 Output_section
* output_section
,
2403 const elfcpp::Rel
<32, false>& rel
,
2404 unsigned int r_type
,
2405 const Sized_symbol
<32>* gsym
,
2406 const Symbol_value
<32>* psymval
,
2407 unsigned char* view
,
2408 elfcpp::Elf_types
<32>::Elf_Addr address
,
2409 section_size_type view_size
)
2411 if (this->skip_call_tls_get_addr_
)
2413 if ((r_type
!= elfcpp::R_386_PLT32
2414 && r_type
!= elfcpp::R_386_PC32
)
2416 || strcmp(gsym
->name(), "___tls_get_addr") != 0)
2417 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2418 _("missing expected TLS relocation"));
2421 this->skip_call_tls_get_addr_
= false;
2426 const Sized_relobj_file
<32, false>* object
= relinfo
->object
;
2428 // Pick the value to use for symbols defined in shared objects.
2429 Symbol_value
<32> symval
;
2431 && gsym
->type() == elfcpp::STT_GNU_IFUNC
2432 && r_type
== elfcpp::R_386_32
2433 && gsym
->needs_dynamic_reloc(Scan::get_reference_flags(r_type
))
2434 && gsym
->can_use_relative_reloc(false)
2435 && !gsym
->is_from_dynobj()
2436 && !gsym
->is_undefined()
2437 && !gsym
->is_preemptible())
2439 // In this case we are generating a R_386_IRELATIVE reloc. We
2440 // want to use the real value of the symbol, not the PLT offset.
2442 else if (gsym
!= NULL
2443 && gsym
->use_plt_offset(Scan::get_reference_flags(r_type
)))
2445 symval
.set_output_value(target
->plt_address_for_global(gsym
)
2446 + gsym
->plt_offset());
2449 else if (gsym
== NULL
&& psymval
->is_ifunc_symbol())
2451 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
2452 if (object
->local_has_plt_offset(r_sym
))
2454 symval
.set_output_value(target
->plt_address_for_local(object
, r_sym
)
2455 + object
->local_plt_offset(r_sym
));
2460 // Get the GOT offset if needed.
2461 // The GOT pointer points to the end of the GOT section.
2462 // We need to subtract the size of the GOT section to get
2463 // the actual offset to use in the relocation.
2464 bool have_got_offset
= false;
2465 unsigned int got_offset
= 0;
2468 case elfcpp::R_386_GOT32
:
2471 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
2472 got_offset
= (gsym
->got_offset(GOT_TYPE_STANDARD
)
2473 - target
->got_size());
2477 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
2478 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
2479 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
2480 - target
->got_size());
2482 have_got_offset
= true;
2491 case elfcpp::R_386_NONE
:
2492 case elfcpp::R_386_GNU_VTINHERIT
:
2493 case elfcpp::R_386_GNU_VTENTRY
:
2496 case elfcpp::R_386_32
:
2497 if (should_apply_static_reloc(gsym
, r_type
, true, output_section
))
2498 Relocate_functions
<32, false>::rel32(view
, object
, psymval
);
2501 case elfcpp::R_386_PC32
:
2502 if (should_apply_static_reloc(gsym
, r_type
, true, output_section
))
2503 Relocate_functions
<32, false>::pcrel32(view
, object
, psymval
, address
);
2506 case elfcpp::R_386_16
:
2507 if (should_apply_static_reloc(gsym
, r_type
, false, output_section
))
2508 Relocate_functions
<32, false>::rel16(view
, object
, psymval
);
2511 case elfcpp::R_386_PC16
:
2512 if (should_apply_static_reloc(gsym
, r_type
, false, output_section
))
2513 Relocate_functions
<32, false>::pcrel16(view
, object
, psymval
, address
);
2516 case elfcpp::R_386_8
:
2517 if (should_apply_static_reloc(gsym
, r_type
, false, output_section
))
2518 Relocate_functions
<32, false>::rel8(view
, object
, psymval
);
2521 case elfcpp::R_386_PC8
:
2522 if (should_apply_static_reloc(gsym
, r_type
, false, output_section
))
2523 Relocate_functions
<32, false>::pcrel8(view
, object
, psymval
, address
);
2526 case elfcpp::R_386_PLT32
:
2527 gold_assert(gsym
== NULL
2528 || gsym
->has_plt_offset()
2529 || gsym
->final_value_is_known()
2530 || (gsym
->is_defined()
2531 && !gsym
->is_from_dynobj()
2532 && !gsym
->is_preemptible()));
2533 Relocate_functions
<32, false>::pcrel32(view
, object
, psymval
, address
);
2536 case elfcpp::R_386_GOT32
:
2537 gold_assert(have_got_offset
);
2538 Relocate_functions
<32, false>::rel32(view
, got_offset
);
2541 case elfcpp::R_386_GOTOFF
:
2543 elfcpp::Elf_types
<32>::Elf_Addr value
;
2544 value
= (psymval
->value(object
, 0)
2545 - target
->got_plt_section()->address());
2546 Relocate_functions
<32, false>::rel32(view
, value
);
2550 case elfcpp::R_386_GOTPC
:
2552 elfcpp::Elf_types
<32>::Elf_Addr value
;
2553 value
= target
->got_plt_section()->address();
2554 Relocate_functions
<32, false>::pcrel32(view
, value
, address
);
2558 case elfcpp::R_386_COPY
:
2559 case elfcpp::R_386_GLOB_DAT
:
2560 case elfcpp::R_386_JUMP_SLOT
:
2561 case elfcpp::R_386_RELATIVE
:
2562 case elfcpp::R_386_IRELATIVE
:
2563 // These are outstanding tls relocs, which are unexpected when
2565 case elfcpp::R_386_TLS_TPOFF
:
2566 case elfcpp::R_386_TLS_DTPMOD32
:
2567 case elfcpp::R_386_TLS_DTPOFF32
:
2568 case elfcpp::R_386_TLS_TPOFF32
:
2569 case elfcpp::R_386_TLS_DESC
:
2570 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2571 _("unexpected reloc %u in object file"),
2575 // These are initial tls relocs, which are expected when
2577 case elfcpp::R_386_TLS_GD
: // Global-dynamic
2578 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
2579 case elfcpp::R_386_TLS_DESC_CALL
:
2580 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
2581 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
2582 case elfcpp::R_386_TLS_IE
: // Initial-exec
2583 case elfcpp::R_386_TLS_IE_32
:
2584 case elfcpp::R_386_TLS_GOTIE
:
2585 case elfcpp::R_386_TLS_LE
: // Local-exec
2586 case elfcpp::R_386_TLS_LE_32
:
2587 this->relocate_tls(relinfo
, target
, relnum
, rel
, r_type
, gsym
, psymval
,
2588 view
, address
, view_size
);
2591 case elfcpp::R_386_32PLT
:
2592 case elfcpp::R_386_TLS_GD_32
:
2593 case elfcpp::R_386_TLS_GD_PUSH
:
2594 case elfcpp::R_386_TLS_GD_CALL
:
2595 case elfcpp::R_386_TLS_GD_POP
:
2596 case elfcpp::R_386_TLS_LDM_32
:
2597 case elfcpp::R_386_TLS_LDM_PUSH
:
2598 case elfcpp::R_386_TLS_LDM_CALL
:
2599 case elfcpp::R_386_TLS_LDM_POP
:
2600 case elfcpp::R_386_USED_BY_INTEL_200
:
2602 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2603 _("unsupported reloc %u"),
2611 // Perform a TLS relocation.
2614 Target_i386::Relocate::relocate_tls(const Relocate_info
<32, false>* relinfo
,
2615 Target_i386
* target
,
2617 const elfcpp::Rel
<32, false>& rel
,
2618 unsigned int r_type
,
2619 const Sized_symbol
<32>* gsym
,
2620 const Symbol_value
<32>* psymval
,
2621 unsigned char* view
,
2622 elfcpp::Elf_types
<32>::Elf_Addr
,
2623 section_size_type view_size
)
2625 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
2627 const Sized_relobj_file
<32, false>* object
= relinfo
->object
;
2629 elfcpp::Elf_types
<32>::Elf_Addr value
= psymval
->value(object
, 0);
2631 const bool is_final
= (gsym
== NULL
2632 ? !parameters
->options().shared()
2633 : gsym
->final_value_is_known());
2634 const tls::Tls_optimization optimized_type
2635 = Target_i386::optimize_tls_reloc(is_final
, r_type
);
2638 case elfcpp::R_386_TLS_GD
: // Global-dynamic
2639 if (optimized_type
== tls::TLSOPT_TO_LE
)
2641 if (tls_segment
== NULL
)
2643 gold_assert(parameters
->errors()->error_count() > 0
2644 || issue_undefined_symbol_error(gsym
));
2647 this->tls_gd_to_le(relinfo
, relnum
, tls_segment
,
2648 rel
, r_type
, value
, view
,
2654 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
2655 ? GOT_TYPE_TLS_NOFFSET
2656 : GOT_TYPE_TLS_PAIR
);
2657 unsigned int got_offset
;
2660 gold_assert(gsym
->has_got_offset(got_type
));
2661 got_offset
= gsym
->got_offset(got_type
) - target
->got_size();
2665 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
2666 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
2667 got_offset
= (object
->local_got_offset(r_sym
, got_type
)
2668 - target
->got_size());
2670 if (optimized_type
== tls::TLSOPT_TO_IE
)
2672 if (tls_segment
== NULL
)
2674 gold_assert(parameters
->errors()->error_count() > 0
2675 || issue_undefined_symbol_error(gsym
));
2678 this->tls_gd_to_ie(relinfo
, relnum
, tls_segment
, rel
, r_type
,
2679 got_offset
, view
, view_size
);
2682 else if (optimized_type
== tls::TLSOPT_NONE
)
2684 // Relocate the field with the offset of the pair of GOT
2686 Relocate_functions
<32, false>::rel32(view
, got_offset
);
2690 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2691 _("unsupported reloc %u"),
2695 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
2696 case elfcpp::R_386_TLS_DESC_CALL
:
2697 this->local_dynamic_type_
= LOCAL_DYNAMIC_GNU
;
2698 if (optimized_type
== tls::TLSOPT_TO_LE
)
2700 if (tls_segment
== NULL
)
2702 gold_assert(parameters
->errors()->error_count() > 0
2703 || issue_undefined_symbol_error(gsym
));
2706 this->tls_desc_gd_to_le(relinfo
, relnum
, tls_segment
,
2707 rel
, r_type
, value
, view
,
2713 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
2714 ? GOT_TYPE_TLS_NOFFSET
2715 : GOT_TYPE_TLS_DESC
);
2716 unsigned int got_offset
= 0;
2717 if (r_type
== elfcpp::R_386_TLS_GOTDESC
2718 && optimized_type
== tls::TLSOPT_NONE
)
2720 // We created GOT entries in the .got.tlsdesc portion of
2721 // the .got.plt section, but the offset stored in the
2722 // symbol is the offset within .got.tlsdesc.
2723 got_offset
= (target
->got_size()
2724 + target
->got_plt_section()->data_size());
2728 gold_assert(gsym
->has_got_offset(got_type
));
2729 got_offset
+= gsym
->got_offset(got_type
) - target
->got_size();
2733 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
2734 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
2735 got_offset
+= (object
->local_got_offset(r_sym
, got_type
)
2736 - target
->got_size());
2738 if (optimized_type
== tls::TLSOPT_TO_IE
)
2740 if (tls_segment
== NULL
)
2742 gold_assert(parameters
->errors()->error_count() > 0
2743 || issue_undefined_symbol_error(gsym
));
2746 this->tls_desc_gd_to_ie(relinfo
, relnum
, tls_segment
, rel
, r_type
,
2747 got_offset
, view
, view_size
);
2750 else if (optimized_type
== tls::TLSOPT_NONE
)
2752 if (r_type
== elfcpp::R_386_TLS_GOTDESC
)
2754 // Relocate the field with the offset of the pair of GOT
2756 Relocate_functions
<32, false>::rel32(view
, got_offset
);
2761 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2762 _("unsupported reloc %u"),
2766 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
2767 if (this->local_dynamic_type_
== LOCAL_DYNAMIC_SUN
)
2769 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2770 _("both SUN and GNU model "
2771 "TLS relocations"));
2774 this->local_dynamic_type_
= LOCAL_DYNAMIC_GNU
;
2775 if (optimized_type
== tls::TLSOPT_TO_LE
)
2777 if (tls_segment
== NULL
)
2779 gold_assert(parameters
->errors()->error_count() > 0
2780 || issue_undefined_symbol_error(gsym
));
2783 this->tls_ld_to_le(relinfo
, relnum
, tls_segment
, rel
, r_type
,
2784 value
, view
, view_size
);
2787 else if (optimized_type
== tls::TLSOPT_NONE
)
2789 // Relocate the field with the offset of the GOT entry for
2790 // the module index.
2791 unsigned int got_offset
;
2792 got_offset
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
)
2793 - target
->got_size());
2794 Relocate_functions
<32, false>::rel32(view
, got_offset
);
2797 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2798 _("unsupported reloc %u"),
2802 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
2803 if (optimized_type
== tls::TLSOPT_TO_LE
)
2805 // This reloc can appear in debugging sections, in which
2806 // case we must not convert to local-exec. We decide what
2807 // to do based on whether the section is marked as
2808 // containing executable code. That is what the GNU linker
2810 elfcpp::Shdr
<32, false> shdr(relinfo
->data_shdr
);
2811 if ((shdr
.get_sh_flags() & elfcpp::SHF_EXECINSTR
) != 0)
2813 if (tls_segment
== NULL
)
2815 gold_assert(parameters
->errors()->error_count() > 0
2816 || issue_undefined_symbol_error(gsym
));
2819 value
-= tls_segment
->memsz();
2822 Relocate_functions
<32, false>::rel32(view
, value
);
2825 case elfcpp::R_386_TLS_IE
: // Initial-exec
2826 case elfcpp::R_386_TLS_GOTIE
:
2827 case elfcpp::R_386_TLS_IE_32
:
2828 if (optimized_type
== tls::TLSOPT_TO_LE
)
2830 if (tls_segment
== NULL
)
2832 gold_assert(parameters
->errors()->error_count() > 0
2833 || issue_undefined_symbol_error(gsym
));
2836 Target_i386::Relocate::tls_ie_to_le(relinfo
, relnum
, tls_segment
,
2837 rel
, r_type
, value
, view
,
2841 else if (optimized_type
== tls::TLSOPT_NONE
)
2843 // Relocate the field with the offset of the GOT entry for
2844 // the tp-relative offset of the symbol.
2845 unsigned int got_type
= (r_type
== elfcpp::R_386_TLS_IE_32
2846 ? GOT_TYPE_TLS_OFFSET
2847 : GOT_TYPE_TLS_NOFFSET
);
2848 unsigned int got_offset
;
2851 gold_assert(gsym
->has_got_offset(got_type
));
2852 got_offset
= gsym
->got_offset(got_type
);
2856 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
2857 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
2858 got_offset
= object
->local_got_offset(r_sym
, got_type
);
2860 // For the R_386_TLS_IE relocation, we need to apply the
2861 // absolute address of the GOT entry.
2862 if (r_type
== elfcpp::R_386_TLS_IE
)
2863 got_offset
+= target
->got_plt_section()->address();
2864 // All GOT offsets are relative to the end of the GOT.
2865 got_offset
-= target
->got_size();
2866 Relocate_functions
<32, false>::rel32(view
, got_offset
);
2869 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2870 _("unsupported reloc %u"),
2874 case elfcpp::R_386_TLS_LE
: // Local-exec
2875 // If we're creating a shared library, a dynamic relocation will
2876 // have been created for this location, so do not apply it now.
2877 if (!parameters
->options().shared())
2879 if (tls_segment
== NULL
)
2881 gold_assert(parameters
->errors()->error_count() > 0
2882 || issue_undefined_symbol_error(gsym
));
2885 value
-= tls_segment
->memsz();
2886 Relocate_functions
<32, false>::rel32(view
, value
);
2890 case elfcpp::R_386_TLS_LE_32
:
2891 // If we're creating a shared library, a dynamic relocation will
2892 // have been created for this location, so do not apply it now.
2893 if (!parameters
->options().shared())
2895 if (tls_segment
== NULL
)
2897 gold_assert(parameters
->errors()->error_count() > 0
2898 || issue_undefined_symbol_error(gsym
));
2901 value
= tls_segment
->memsz() - value
;
2902 Relocate_functions
<32, false>::rel32(view
, value
);
2908 // Do a relocation in which we convert a TLS General-Dynamic to a
2912 Target_i386::Relocate::tls_gd_to_le(const Relocate_info
<32, false>* relinfo
,
2914 Output_segment
* tls_segment
,
2915 const elfcpp::Rel
<32, false>& rel
,
2917 elfcpp::Elf_types
<32>::Elf_Addr value
,
2918 unsigned char* view
,
2919 section_size_type view_size
)
2921 // leal foo(,%reg,1),%eax; call ___tls_get_addr
2922 // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
2923 // leal foo(%reg),%eax; call ___tls_get_addr
2924 // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
2926 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2927 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 9);
2929 unsigned char op1
= view
[-1];
2930 unsigned char op2
= view
[-2];
2932 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2933 op2
== 0x8d || op2
== 0x04);
2934 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[4] == 0xe8);
2940 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -3);
2941 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[-3] == 0x8d);
2942 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2943 ((op1
& 0xc7) == 0x05 && op1
!= (4 << 3)));
2944 memcpy(view
- 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2948 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2949 (op1
& 0xf8) == 0x80 && (op1
& 7) != 4);
2950 if (rel
.get_r_offset() + 9 < view_size
2953 // There is a trailing nop. Use the size byte subl.
2954 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2959 // Use the five byte subl.
2960 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2964 value
= tls_segment
->memsz() - value
;
2965 Relocate_functions
<32, false>::rel32(view
+ roff
, value
);
2967 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2969 this->skip_call_tls_get_addr_
= true;
2972 // Do a relocation in which we convert a TLS General-Dynamic to an
2976 Target_i386::Relocate::tls_gd_to_ie(const Relocate_info
<32, false>* relinfo
,
2979 const elfcpp::Rel
<32, false>& rel
,
2981 elfcpp::Elf_types
<32>::Elf_Addr value
,
2982 unsigned char* view
,
2983 section_size_type view_size
)
2985 // leal foo(,%ebx,1),%eax; call ___tls_get_addr
2986 // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax
2988 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2989 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 9);
2991 unsigned char op1
= view
[-1];
2992 unsigned char op2
= view
[-2];
2994 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2995 op2
== 0x8d || op2
== 0x04);
2996 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[4] == 0xe8);
3000 // FIXME: For now, support only the first (SIB) form.
3001 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), op2
== 0x04);
3005 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -3);
3006 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[-3] == 0x8d);
3007 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
3008 ((op1
& 0xc7) == 0x05 && op1
!= (4 << 3)));
3009 memcpy(view
- 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12);
3013 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
3014 (op1
& 0xf8) == 0x80 && (op1
& 7) != 4);
3015 if (rel
.get_r_offset() + 9 < view_size
3018 // FIXME: This is not the right instruction sequence.
3019 // There is a trailing nop. Use the size byte subl.
3020 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3025 // FIXME: This is not the right instruction sequence.
3026 // Use the five byte subl.
3027 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
3031 Relocate_functions
<32, false>::rel32(view
+ roff
, value
);
3033 // The next reloc should be a PLT32 reloc against __tls_get_addr.
3035 this->skip_call_tls_get_addr_
= true;
3038 // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL
3039 // General-Dynamic to a Local-Exec.
3042 Target_i386::Relocate::tls_desc_gd_to_le(
3043 const Relocate_info
<32, false>* relinfo
,
3045 Output_segment
* tls_segment
,
3046 const elfcpp::Rel
<32, false>& rel
,
3047 unsigned int r_type
,
3048 elfcpp::Elf_types
<32>::Elf_Addr value
,
3049 unsigned char* view
,
3050 section_size_type view_size
)
3052 if (r_type
== elfcpp::R_386_TLS_GOTDESC
)
3054 // leal foo@TLSDESC(%ebx), %eax
3055 // ==> leal foo@NTPOFF, %eax
3056 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
3057 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
3058 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
3059 view
[-2] == 0x8d && view
[-1] == 0x83);
3061 value
-= tls_segment
->memsz();
3062 Relocate_functions
<32, false>::rel32(view
, value
);
3066 // call *foo@TLSCALL(%eax)
3068 gold_assert(r_type
== elfcpp::R_386_TLS_DESC_CALL
);
3069 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 2);
3070 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
3071 view
[0] == 0xff && view
[1] == 0x10);
3077 // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL
3078 // General-Dynamic to an Initial-Exec.
3081 Target_i386::Relocate::tls_desc_gd_to_ie(
3082 const Relocate_info
<32, false>* relinfo
,
3085 const elfcpp::Rel
<32, false>& rel
,
3086 unsigned int r_type
,
3087 elfcpp::Elf_types
<32>::Elf_Addr value
,
3088 unsigned char* view
,
3089 section_size_type view_size
)
3091 if (r_type
== elfcpp::R_386_TLS_GOTDESC
)
3093 // leal foo@TLSDESC(%ebx), %eax
3094 // ==> movl foo@GOTNTPOFF(%ebx), %eax
3095 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
3096 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
3097 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
3098 view
[-2] == 0x8d && view
[-1] == 0x83);
3100 Relocate_functions
<32, false>::rel32(view
, value
);
3104 // call *foo@TLSCALL(%eax)
3106 gold_assert(r_type
== elfcpp::R_386_TLS_DESC_CALL
);
3107 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 2);
3108 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
3109 view
[0] == 0xff && view
[1] == 0x10);
3115 // Do a relocation in which we convert a TLS Local-Dynamic to a
3119 Target_i386::Relocate::tls_ld_to_le(const Relocate_info
<32, false>* relinfo
,
3122 const elfcpp::Rel
<32, false>& rel
,
3124 elfcpp::Elf_types
<32>::Elf_Addr
,
3125 unsigned char* view
,
3126 section_size_type view_size
)
3128 // leal foo(%reg), %eax; call ___tls_get_addr
3129 // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi
3131 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
3132 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 9);
3134 // FIXME: Does this test really always pass?
3135 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
3136 view
[-2] == 0x8d && view
[-1] == 0x83);
3138 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[4] == 0xe8);
3140 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11);
3142 // The next reloc should be a PLT32 reloc against __tls_get_addr.
3144 this->skip_call_tls_get_addr_
= true;
3147 // Do a relocation in which we convert a TLS Initial-Exec to a
3151 Target_i386::Relocate::tls_ie_to_le(const Relocate_info
<32, false>* relinfo
,
3153 Output_segment
* tls_segment
,
3154 const elfcpp::Rel
<32, false>& rel
,
3155 unsigned int r_type
,
3156 elfcpp::Elf_types
<32>::Elf_Addr value
,
3157 unsigned char* view
,
3158 section_size_type view_size
)
3160 // We have to actually change the instructions, which means that we
3161 // need to examine the opcodes to figure out which instruction we
3163 if (r_type
== elfcpp::R_386_TLS_IE
)
3165 // movl %gs:XX,%eax ==> movl $YY,%eax
3166 // movl %gs:XX,%reg ==> movl $YY,%reg
3167 // addl %gs:XX,%reg ==> addl $YY,%reg
3168 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -1);
3169 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
3171 unsigned char op1
= view
[-1];
3174 // movl XX,%eax ==> movl $YY,%eax
3179 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
3181 unsigned char op2
= view
[-2];
3184 // movl XX,%reg ==> movl $YY,%reg
3185 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
3186 (op1
& 0xc7) == 0x05);
3188 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
3190 else if (op2
== 0x03)
3192 // addl XX,%reg ==> addl $YY,%reg
3193 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
3194 (op1
& 0xc7) == 0x05);
3196 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
3199 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), 0);
3204 // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
3205 // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
3206 // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
3207 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
3208 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
3210 unsigned char op1
= view
[-1];
3211 unsigned char op2
= view
[-2];
3212 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
3213 (op1
& 0xc0) == 0x80 && (op1
& 7) != 4);
3216 // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
3218 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
3220 else if (op2
== 0x2b)
3222 // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
3224 view
[-1] = 0xe8 | ((op1
>> 3) & 7);
3226 else if (op2
== 0x03)
3228 // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
3230 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
3233 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), 0);
3236 value
= tls_segment
->memsz() - value
;
3237 if (r_type
== elfcpp::R_386_TLS_IE
|| r_type
== elfcpp::R_386_TLS_GOTIE
)
3240 Relocate_functions
<32, false>::rel32(view
, value
);
3243 // Relocate section data.
3246 Target_i386::relocate_section(const Relocate_info
<32, false>* relinfo
,
3247 unsigned int sh_type
,
3248 const unsigned char* prelocs
,
3250 Output_section
* output_section
,
3251 bool needs_special_offset_handling
,
3252 unsigned char* view
,
3253 elfcpp::Elf_types
<32>::Elf_Addr address
,
3254 section_size_type view_size
,
3255 const Reloc_symbol_changes
* reloc_symbol_changes
)
3257 gold_assert(sh_type
== elfcpp::SHT_REL
);
3259 gold::relocate_section
<32, false, Target_i386
, elfcpp::SHT_REL
,
3260 Target_i386::Relocate
>(
3266 needs_special_offset_handling
,
3270 reloc_symbol_changes
);
3273 // Return the size of a relocation while scanning during a relocatable
3277 Target_i386::Relocatable_size_for_reloc::get_size_for_reloc(
3278 unsigned int r_type
,
3283 case elfcpp::R_386_NONE
:
3284 case elfcpp::R_386_GNU_VTINHERIT
:
3285 case elfcpp::R_386_GNU_VTENTRY
:
3286 case elfcpp::R_386_TLS_GD
: // Global-dynamic
3287 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
3288 case elfcpp::R_386_TLS_DESC_CALL
:
3289 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
3290 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
3291 case elfcpp::R_386_TLS_IE
: // Initial-exec
3292 case elfcpp::R_386_TLS_IE_32
:
3293 case elfcpp::R_386_TLS_GOTIE
:
3294 case elfcpp::R_386_TLS_LE
: // Local-exec
3295 case elfcpp::R_386_TLS_LE_32
:
3298 case elfcpp::R_386_32
:
3299 case elfcpp::R_386_PC32
:
3300 case elfcpp::R_386_GOT32
:
3301 case elfcpp::R_386_PLT32
:
3302 case elfcpp::R_386_GOTOFF
:
3303 case elfcpp::R_386_GOTPC
:
3306 case elfcpp::R_386_16
:
3307 case elfcpp::R_386_PC16
:
3310 case elfcpp::R_386_8
:
3311 case elfcpp::R_386_PC8
:
3314 // These are relocations which should only be seen by the
3315 // dynamic linker, and should never be seen here.
3316 case elfcpp::R_386_COPY
:
3317 case elfcpp::R_386_GLOB_DAT
:
3318 case elfcpp::R_386_JUMP_SLOT
:
3319 case elfcpp::R_386_RELATIVE
:
3320 case elfcpp::R_386_IRELATIVE
:
3321 case elfcpp::R_386_TLS_TPOFF
:
3322 case elfcpp::R_386_TLS_DTPMOD32
:
3323 case elfcpp::R_386_TLS_DTPOFF32
:
3324 case elfcpp::R_386_TLS_TPOFF32
:
3325 case elfcpp::R_386_TLS_DESC
:
3326 object
->error(_("unexpected reloc %u in object file"), r_type
);
3329 case elfcpp::R_386_32PLT
:
3330 case elfcpp::R_386_TLS_GD_32
:
3331 case elfcpp::R_386_TLS_GD_PUSH
:
3332 case elfcpp::R_386_TLS_GD_CALL
:
3333 case elfcpp::R_386_TLS_GD_POP
:
3334 case elfcpp::R_386_TLS_LDM_32
:
3335 case elfcpp::R_386_TLS_LDM_PUSH
:
3336 case elfcpp::R_386_TLS_LDM_CALL
:
3337 case elfcpp::R_386_TLS_LDM_POP
:
3338 case elfcpp::R_386_USED_BY_INTEL_200
:
3340 object
->error(_("unsupported reloc %u in object file"), r_type
);
3345 // Scan the relocs during a relocatable link.
3348 Target_i386::scan_relocatable_relocs(Symbol_table
* symtab
,
3350 Sized_relobj_file
<32, false>* object
,
3351 unsigned int data_shndx
,
3352 unsigned int sh_type
,
3353 const unsigned char* prelocs
,
3355 Output_section
* output_section
,
3356 bool needs_special_offset_handling
,
3357 size_t local_symbol_count
,
3358 const unsigned char* plocal_symbols
,
3359 Relocatable_relocs
* rr
)
3361 gold_assert(sh_type
== elfcpp::SHT_REL
);
3363 typedef gold::Default_scan_relocatable_relocs
<elfcpp::SHT_REL
,
3364 Relocatable_size_for_reloc
> Scan_relocatable_relocs
;
3366 gold::scan_relocatable_relocs
<32, false, elfcpp::SHT_REL
,
3367 Scan_relocatable_relocs
>(
3375 needs_special_offset_handling
,
3381 // Relocate a section during a relocatable link.
3384 Target_i386::relocate_for_relocatable(
3385 const Relocate_info
<32, false>* relinfo
,
3386 unsigned int sh_type
,
3387 const unsigned char* prelocs
,
3389 Output_section
* output_section
,
3390 off_t offset_in_output_section
,
3391 const Relocatable_relocs
* rr
,
3392 unsigned char* view
,
3393 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
3394 section_size_type view_size
,
3395 unsigned char* reloc_view
,
3396 section_size_type reloc_view_size
)
3398 gold_assert(sh_type
== elfcpp::SHT_REL
);
3400 gold::relocate_for_relocatable
<32, false, elfcpp::SHT_REL
>(
3405 offset_in_output_section
,
3414 // Return the value to use for a dynamic which requires special
3415 // treatment. This is how we support equality comparisons of function
3416 // pointers across shared library boundaries, as described in the
3417 // processor specific ABI supplement.
3420 Target_i386::do_dynsym_value(const Symbol
* gsym
) const
3422 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
3423 return this->plt_address_for_global(gsym
) + gsym
->plt_offset();
3426 // Return a string used to fill a code section with nops to take up
3427 // the specified length.
3430 Target_i386::do_code_fill(section_size_type length
) const
3434 // Build a jmp instruction to skip over the bytes.
3435 unsigned char jmp
[5];
3437 elfcpp::Swap_unaligned
<32, false>::writeval(jmp
+ 1, length
- 5);
3438 return (std::string(reinterpret_cast<char*>(&jmp
[0]), 5)
3439 + std::string(length
- 5, '\0'));
3442 // Nop sequences of various lengths.
3443 const char nop1
[1] = { 0x90 }; // nop
3444 const char nop2
[2] = { 0x66, 0x90 }; // xchg %ax %ax
3445 const char nop3
[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi
3446 const char nop4
[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi
3447 const char nop5
[5] = { 0x90, 0x8d, 0x74, 0x26, // nop
3448 0x00 }; // leal 0(%esi,1),%esi
3449 const char nop6
[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
3451 const char nop7
[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
3453 const char nop8
[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop
3454 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi
3455 const char nop9
[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi
3456 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi
3458 const char nop10
[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi
3459 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi
3461 const char nop11
[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi
3462 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi
3464 const char nop12
[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
3465 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi
3466 0x00, 0x00, 0x00, 0x00 };
3467 const char nop13
[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
3468 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi
3469 0x27, 0x00, 0x00, 0x00,
3471 const char nop14
[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
3472 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi
3473 0xbc, 0x27, 0x00, 0x00,
3475 const char nop15
[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15
3476 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,...
3477 0x90, 0x90, 0x90, 0x90,
3480 const char* nops
[16] = {
3482 nop1
, nop2
, nop3
, nop4
, nop5
, nop6
, nop7
,
3483 nop8
, nop9
, nop10
, nop11
, nop12
, nop13
, nop14
, nop15
3486 return std::string(nops
[length
], length
);
3489 // Return the value to use for the base of a DW_EH_PE_datarel offset
3490 // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their
3491 // assembler can not write out the difference between two labels in
3492 // different sections, so instead of using a pc-relative value they
3493 // use an offset from the GOT.
3496 Target_i386::do_ehframe_datarel_base() const
3498 gold_assert(this->global_offset_table_
!= NULL
);
3499 Symbol
* sym
= this->global_offset_table_
;
3500 Sized_symbol
<32>* ssym
= static_cast<Sized_symbol
<32>*>(sym
);
3501 return ssym
->value();
3504 // Return whether SYM should be treated as a call to a non-split
3505 // function. We don't want that to be true of a call to a
3506 // get_pc_thunk function.
3509 Target_i386::do_is_call_to_non_split(const Symbol
* sym
, unsigned int) const
3511 return (sym
->type() == elfcpp::STT_FUNC
3512 && !is_prefix_of("__i686.get_pc_thunk.", sym
->name()));
3515 // FNOFFSET in section SHNDX in OBJECT is the start of a function
3516 // compiled with -fsplit-stack. The function calls non-split-stack
3517 // code. We have to change the function so that it always ensures
3518 // that it has enough stack space to run some random function.
3521 Target_i386::do_calls_non_split(Relobj
* object
, unsigned int shndx
,
3522 section_offset_type fnoffset
,
3523 section_size_type fnsize
,
3524 unsigned char* view
,
3525 section_size_type view_size
,
3527 std::string
* to
) const
3529 // The function starts with a comparison of the stack pointer and a
3530 // field in the TCB. This is followed by a jump.
3533 if (this->match_view(view
, view_size
, fnoffset
, "\x65\x3b\x25", 3)
3536 // We will call __morestack if the carry flag is set after this
3537 // comparison. We turn the comparison into an stc instruction
3539 view
[fnoffset
] = '\xf9';
3540 this->set_view_to_nop(view
, view_size
, fnoffset
+ 1, 6);
3542 // lea NN(%esp),%ecx
3543 // lea NN(%esp),%edx
3544 else if ((this->match_view(view
, view_size
, fnoffset
, "\x8d\x8c\x24", 3)
3545 || this->match_view(view
, view_size
, fnoffset
, "\x8d\x94\x24", 3))
3548 // This is loading an offset from the stack pointer for a
3549 // comparison. The offset is negative, so we decrease the
3550 // offset by the amount of space we need for the stack. This
3551 // means we will avoid calling __morestack if there happens to
3552 // be plenty of space on the stack already.
3553 unsigned char* pval
= view
+ fnoffset
+ 3;
3554 uint32_t val
= elfcpp::Swap_unaligned
<32, false>::readval(pval
);
3555 val
-= parameters
->options().split_stack_adjust_size();
3556 elfcpp::Swap_unaligned
<32, false>::writeval(pval
, val
);
3560 if (!object
->has_no_split_stack())
3561 object
->error(_("failed to match split-stack sequence at "
3562 "section %u offset %0zx"),
3563 shndx
, static_cast<size_t>(fnoffset
));
3567 // We have to change the function so that it calls
3568 // __morestack_non_split instead of __morestack. The former will
3569 // allocate additional stack space.
3570 *from
= "__morestack";
3571 *to
= "__morestack_non_split";
3574 // The selector for i386 object files.
3576 class Target_selector_i386
: public Target_selector_freebsd
3579 Target_selector_i386()
3580 : Target_selector_freebsd(elfcpp::EM_386
, 32, false,
3581 "elf32-i386", "elf32-i386-freebsd",
3586 do_instantiate_target()
3587 { return new Target_i386(); }
3590 Target_selector_i386 target_selector_i386
;
3592 } // End anonymous namespace.