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(Symbol_table
*, Layout
*, Output_data_space
*);
58 // Add an entry to the PLT.
60 add_entry(Symbol
* gsym
);
62 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
64 add_local_ifunc_entry(Sized_relobj_file
<32, false>* relobj
,
65 unsigned int local_sym_index
);
67 // Return the .rel.plt section data.
70 { return this->rel_
; }
72 // Return where the TLS_DESC relocations should go.
74 rel_tls_desc(Layout
*);
76 // Return the number of PLT entries.
79 { return this->count_
; }
81 // Return the offset of the first non-reserved PLT entry.
83 first_plt_entry_offset()
84 { return plt_entry_size
; }
86 // Return the size of a PLT entry.
89 { return plt_entry_size
; }
93 do_adjust_output_section(Output_section
* os
);
95 // Write to a map file.
97 do_print_to_mapfile(Mapfile
* mapfile
) const
98 { mapfile
->print_output_data(this, _("** PLT")); }
101 // The size of an entry in the PLT.
102 static const int plt_entry_size
= 16;
104 // The first entry in the PLT for an executable.
105 static const unsigned char exec_first_plt_entry
[plt_entry_size
];
107 // The first entry in the PLT for a shared object.
108 static const unsigned char dyn_first_plt_entry
[plt_entry_size
];
110 // Other entries in the PLT for an executable.
111 static const unsigned char exec_plt_entry
[plt_entry_size
];
113 // Other entries in the PLT for a shared object.
114 static const unsigned char dyn_plt_entry
[plt_entry_size
];
116 // The .eh_frame unwind information for the PLT.
117 static const int plt_eh_frame_cie_size
= 16;
118 static const int plt_eh_frame_fde_size
= 32;
119 static const unsigned char plt_eh_frame_cie
[plt_eh_frame_cie_size
];
120 static const unsigned char plt_eh_frame_fde
[plt_eh_frame_fde_size
];
122 // Set the final size.
124 set_final_data_size()
125 { this->set_data_size((this->count_
+ 1) * plt_entry_size
); }
127 // Write out the PLT data.
129 do_write(Output_file
*);
131 // We keep a list of global STT_GNU_IFUNC symbols, each with its
132 // offset in the GOT.
136 unsigned int got_offset
;
139 // We keep a list of local STT_GNU_IFUNC symbols, each with its
140 // offset in the GOT.
143 Sized_relobj_file
<32, false>* object
;
144 unsigned int local_sym_index
;
145 unsigned int got_offset
;
148 // The reloc section.
150 // The TLS_DESC relocations, if necessary. These must follow the
151 // regular PLT relocs.
152 Reloc_section
* tls_desc_rel_
;
153 // The .got.plt section.
154 Output_data_space
* got_plt_
;
155 // The number of PLT entries.
157 // Global STT_GNU_IFUNC symbols.
158 std::vector
<Global_ifunc
> global_ifuncs_
;
159 // Local STT_GNU_IFUNC symbols.
160 std::vector
<Local_ifunc
> local_ifuncs_
;
163 // The i386 target class.
164 // TLS info comes from
165 // http://people.redhat.com/drepper/tls.pdf
166 // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
168 class Target_i386
: public Sized_target
<32, false>
171 typedef Output_data_reloc
<elfcpp::SHT_REL
, true, 32, false> Reloc_section
;
174 : Sized_target
<32, false>(&i386_info
),
175 got_(NULL
), plt_(NULL
), got_plt_(NULL
), got_tlsdesc_(NULL
),
176 global_offset_table_(NULL
), rel_dyn_(NULL
),
177 copy_relocs_(elfcpp::R_386_COPY
), dynbss_(NULL
),
178 got_mod_index_offset_(-1U), tls_base_symbol_defined_(false)
181 // Process the relocations to determine unreferenced sections for
182 // garbage collection.
184 gc_process_relocs(Symbol_table
* symtab
,
186 Sized_relobj_file
<32, false>* object
,
187 unsigned int data_shndx
,
188 unsigned int sh_type
,
189 const unsigned char* prelocs
,
191 Output_section
* output_section
,
192 bool needs_special_offset_handling
,
193 size_t local_symbol_count
,
194 const unsigned char* plocal_symbols
);
196 // Scan the relocations to look for symbol adjustments.
198 scan_relocs(Symbol_table
* symtab
,
200 Sized_relobj_file
<32, false>* object
,
201 unsigned int data_shndx
,
202 unsigned int sh_type
,
203 const unsigned char* prelocs
,
205 Output_section
* output_section
,
206 bool needs_special_offset_handling
,
207 size_t local_symbol_count
,
208 const unsigned char* plocal_symbols
);
210 // Finalize the sections.
212 do_finalize_sections(Layout
*, const Input_objects
*, Symbol_table
*);
214 // Return the value to use for a dynamic which requires special
217 do_dynsym_value(const Symbol
*) const;
219 // Relocate a section.
221 relocate_section(const Relocate_info
<32, false>*,
222 unsigned int sh_type
,
223 const unsigned char* prelocs
,
225 Output_section
* output_section
,
226 bool needs_special_offset_handling
,
228 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
229 section_size_type view_size
,
230 const Reloc_symbol_changes
*);
232 // Scan the relocs during a relocatable link.
234 scan_relocatable_relocs(Symbol_table
* symtab
,
236 Sized_relobj_file
<32, false>* object
,
237 unsigned int data_shndx
,
238 unsigned int sh_type
,
239 const unsigned char* prelocs
,
241 Output_section
* output_section
,
242 bool needs_special_offset_handling
,
243 size_t local_symbol_count
,
244 const unsigned char* plocal_symbols
,
245 Relocatable_relocs
*);
247 // Relocate a section during a relocatable link.
249 relocate_for_relocatable(const Relocate_info
<32, false>*,
250 unsigned int sh_type
,
251 const unsigned char* prelocs
,
253 Output_section
* output_section
,
254 off_t offset_in_output_section
,
255 const Relocatable_relocs
*,
257 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
258 section_size_type view_size
,
259 unsigned char* reloc_view
,
260 section_size_type reloc_view_size
);
262 // Return a string used to fill a code section with nops.
264 do_code_fill(section_size_type length
) const;
266 // Return whether SYM is defined by the ABI.
268 do_is_defined_by_abi(const Symbol
* sym
) const
269 { return strcmp(sym
->name(), "___tls_get_addr") == 0; }
271 // Return whether a symbol name implies a local label. The UnixWare
272 // 2.1 cc generates temporary symbols that start with .X, so we
273 // recognize them here. FIXME: do other SVR4 compilers also use .X?.
274 // If so, we should move the .X recognition into
275 // Target::do_is_local_label_name.
277 do_is_local_label_name(const char* name
) const
279 if (name
[0] == '.' && name
[1] == 'X')
281 return Target::do_is_local_label_name(name
);
284 // Return the PLT section.
286 do_plt_section_for_global(const Symbol
*) const
287 { return this->plt_section(); }
290 do_plt_section_for_local(const Relobj
*, unsigned int) const
291 { return this->plt_section(); }
293 // We can tell whether we take the address of a function.
295 do_can_check_for_function_pointers() const
298 // Return the base for a DW_EH_PE_datarel encoding.
300 do_ehframe_datarel_base() const;
302 // Return whether SYM is call to a non-split function.
304 do_is_call_to_non_split(const Symbol
* sym
, unsigned int) const;
306 // Adjust -fsplit-stack code which calls non-split-stack code.
308 do_calls_non_split(Relobj
* object
, unsigned int shndx
,
309 section_offset_type fnoffset
, section_size_type fnsize
,
310 unsigned char* view
, section_size_type view_size
,
311 std::string
* from
, std::string
* to
) const;
313 // Return the size of the GOT section.
317 gold_assert(this->got_
!= NULL
);
318 return this->got_
->data_size();
321 // Return the number of entries in the GOT.
323 got_entry_count() const
325 if (this->got_
== NULL
)
327 return this->got_size() / 4;
330 // Return the number of entries in the PLT.
332 plt_entry_count() const;
334 // Return the offset of the first non-reserved PLT entry.
336 first_plt_entry_offset() const;
338 // Return the size of each PLT entry.
340 plt_entry_size() const;
343 // The class which scans relocations.
348 get_reference_flags(unsigned int r_type
);
351 local(Symbol_table
* symtab
, Layout
* layout
, Target_i386
* target
,
352 Sized_relobj_file
<32, false>* object
,
353 unsigned int data_shndx
,
354 Output_section
* output_section
,
355 const elfcpp::Rel
<32, false>& reloc
, unsigned int r_type
,
356 const elfcpp::Sym
<32, false>& lsym
);
359 global(Symbol_table
* symtab
, Layout
* layout
, Target_i386
* target
,
360 Sized_relobj_file
<32, false>* object
,
361 unsigned int data_shndx
,
362 Output_section
* output_section
,
363 const elfcpp::Rel
<32, false>& reloc
, unsigned int r_type
,
367 local_reloc_may_be_function_pointer(Symbol_table
* symtab
, Layout
* layout
,
369 Sized_relobj_file
<32, false>* object
,
370 unsigned int data_shndx
,
371 Output_section
* output_section
,
372 const elfcpp::Rel
<32, false>& reloc
,
374 const elfcpp::Sym
<32, false>& lsym
);
377 global_reloc_may_be_function_pointer(Symbol_table
* symtab
, Layout
* layout
,
379 Sized_relobj_file
<32, false>* object
,
380 unsigned int data_shndx
,
381 Output_section
* output_section
,
382 const elfcpp::Rel
<32, false>& reloc
,
387 possible_function_pointer_reloc(unsigned int r_type
);
390 reloc_needs_plt_for_ifunc(Sized_relobj_file
<32, false>*,
391 unsigned int r_type
);
394 unsupported_reloc_local(Sized_relobj_file
<32, false>*, unsigned int r_type
);
397 unsupported_reloc_global(Sized_relobj_file
<32, false>*, unsigned int r_type
,
401 // The class which implements relocation.
406 : skip_call_tls_get_addr_(false),
407 local_dynamic_type_(LOCAL_DYNAMIC_NONE
)
412 if (this->skip_call_tls_get_addr_
)
414 // FIXME: This needs to specify the location somehow.
415 gold_error(_("missing expected TLS relocation"));
419 // Return whether the static relocation needs to be applied.
421 should_apply_static_reloc(const Sized_symbol
<32>* gsym
,
424 Output_section
* output_section
);
426 // Do a relocation. Return false if the caller should not issue
427 // any warnings about this relocation.
429 relocate(const Relocate_info
<32, false>*, Target_i386
*, Output_section
*,
430 size_t relnum
, const elfcpp::Rel
<32, false>&,
431 unsigned int r_type
, const Sized_symbol
<32>*,
432 const Symbol_value
<32>*,
433 unsigned char*, elfcpp::Elf_types
<32>::Elf_Addr
,
437 // Do a TLS relocation.
439 relocate_tls(const Relocate_info
<32, false>*, Target_i386
* target
,
440 size_t relnum
, const elfcpp::Rel
<32, false>&,
441 unsigned int r_type
, const Sized_symbol
<32>*,
442 const Symbol_value
<32>*,
443 unsigned char*, elfcpp::Elf_types
<32>::Elf_Addr
,
446 // Do a TLS General-Dynamic to Initial-Exec transition.
448 tls_gd_to_ie(const Relocate_info
<32, false>*, size_t relnum
,
449 Output_segment
* tls_segment
,
450 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
451 elfcpp::Elf_types
<32>::Elf_Addr value
,
453 section_size_type view_size
);
455 // Do a TLS General-Dynamic to Local-Exec transition.
457 tls_gd_to_le(const Relocate_info
<32, false>*, size_t relnum
,
458 Output_segment
* tls_segment
,
459 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
460 elfcpp::Elf_types
<32>::Elf_Addr value
,
462 section_size_type view_size
);
464 // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec
467 tls_desc_gd_to_ie(const Relocate_info
<32, false>*, size_t relnum
,
468 Output_segment
* tls_segment
,
469 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
470 elfcpp::Elf_types
<32>::Elf_Addr value
,
472 section_size_type view_size
);
474 // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec
477 tls_desc_gd_to_le(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 Local-Dynamic to Local-Exec transition.
486 tls_ld_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 Initial-Exec to Local-Exec transition.
495 tls_ie_to_le(const Relocate_info
<32, false>*, size_t relnum
,
496 Output_segment
* tls_segment
,
497 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
498 elfcpp::Elf_types
<32>::Elf_Addr value
,
500 section_size_type view_size
);
502 // We need to keep track of which type of local dynamic relocation
503 // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly.
504 enum Local_dynamic_type
511 // This is set if we should skip the next reloc, which should be a
512 // PLT32 reloc against ___tls_get_addr.
513 bool skip_call_tls_get_addr_
;
514 // The type of local dynamic relocation we have seen in the section
515 // being relocated, if any.
516 Local_dynamic_type local_dynamic_type_
;
519 // A class which returns the size required for a relocation type,
520 // used while scanning relocs during a relocatable link.
521 class Relocatable_size_for_reloc
525 get_size_for_reloc(unsigned int, Relobj
*);
528 // Adjust TLS relocation type based on the options and whether this
529 // is a local symbol.
530 static tls::Tls_optimization
531 optimize_tls_reloc(bool is_final
, int r_type
);
533 // Get the GOT section, creating it if necessary.
534 Output_data_got
<32, false>*
535 got_section(Symbol_table
*, Layout
*);
537 // Get the GOT PLT section.
539 got_plt_section() const
541 gold_assert(this->got_plt_
!= NULL
);
542 return this->got_plt_
;
545 // Get the GOT section for TLSDESC entries.
546 Output_data_got
<32, false>*
547 got_tlsdesc_section() const
549 gold_assert(this->got_tlsdesc_
!= NULL
);
550 return this->got_tlsdesc_
;
553 // Create the PLT section.
555 make_plt_section(Symbol_table
* symtab
, Layout
* layout
);
557 // Create a PLT entry for a global symbol.
559 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
561 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
563 make_local_ifunc_plt_entry(Symbol_table
*, Layout
*,
564 Sized_relobj_file
<32, false>* relobj
,
565 unsigned int local_sym_index
);
567 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
569 define_tls_base_symbol(Symbol_table
*, Layout
*);
571 // Create a GOT entry for the TLS module index.
573 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
574 Sized_relobj_file
<32, false>* object
);
576 // Get the PLT section.
577 Output_data_plt_i386
*
580 gold_assert(this->plt_
!= NULL
);
584 // Get the dynamic reloc section, creating it if necessary.
586 rel_dyn_section(Layout
*);
588 // Get the section to use for TLS_DESC relocations.
590 rel_tls_desc_section(Layout
*) const;
592 // Add a potential copy relocation.
594 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
595 Sized_relobj_file
<32, false>* object
,
596 unsigned int shndx
, Output_section
* output_section
,
597 Symbol
* sym
, const elfcpp::Rel
<32, false>& reloc
)
599 this->copy_relocs_
.copy_reloc(symtab
, layout
,
600 symtab
->get_sized_symbol
<32>(sym
),
601 object
, shndx
, output_section
, reloc
,
602 this->rel_dyn_section(layout
));
605 // Information about this specific target which we pass to the
606 // general Target structure.
607 static const Target::Target_info i386_info
;
609 // The types of GOT entries needed for this platform.
610 // These values are exposed to the ABI in an incremental link.
611 // Do not renumber existing values without changing the version
612 // number of the .gnu_incremental_inputs section.
615 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
616 GOT_TYPE_TLS_NOFFSET
= 1, // GOT entry for negative TLS offset
617 GOT_TYPE_TLS_OFFSET
= 2, // GOT entry for positive TLS offset
618 GOT_TYPE_TLS_PAIR
= 3, // GOT entry for TLS module/offset pair
619 GOT_TYPE_TLS_DESC
= 4 // GOT entry for TLS_DESC pair
623 Output_data_got
<32, false>* got_
;
625 Output_data_plt_i386
* plt_
;
626 // The GOT PLT section.
627 Output_data_space
* got_plt_
;
628 // The GOT section for TLSDESC relocations.
629 Output_data_got
<32, false>* got_tlsdesc_
;
630 // The _GLOBAL_OFFSET_TABLE_ symbol.
631 Symbol
* global_offset_table_
;
632 // The dynamic reloc section.
633 Reloc_section
* rel_dyn_
;
634 // Relocs saved to avoid a COPY reloc.
635 Copy_relocs
<elfcpp::SHT_REL
, 32, false> copy_relocs_
;
636 // Space for variables copied with a COPY reloc.
637 Output_data_space
* dynbss_
;
638 // Offset of the GOT entry for the TLS module index.
639 unsigned int got_mod_index_offset_
;
640 // True if the _TLS_MODULE_BASE_ symbol has been defined.
641 bool tls_base_symbol_defined_
;
644 const Target::Target_info
Target_i386::i386_info
=
647 false, // is_big_endian
648 elfcpp::EM_386
, // machine_code
649 false, // has_make_symbol
650 false, // has_resolve
651 true, // has_code_fill
652 true, // is_default_stack_executable
653 true, // can_icf_inline_merge_sections
655 "/usr/lib/libc.so.1", // dynamic_linker
656 0x08048000, // default_text_segment_address
657 0x1000, // abi_pagesize (overridable by -z max-page-size)
658 0x1000, // common_pagesize (overridable by -z common-page-size)
659 elfcpp::SHN_UNDEF
, // small_common_shndx
660 elfcpp::SHN_UNDEF
, // large_common_shndx
661 0, // small_common_section_flags
662 0, // large_common_section_flags
663 NULL
, // attributes_section
664 NULL
// attributes_vendor
667 // Get the GOT section, creating it if necessary.
669 Output_data_got
<32, false>*
670 Target_i386::got_section(Symbol_table
* symtab
, Layout
* layout
)
672 if (this->got_
== NULL
)
674 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
676 this->got_
= new Output_data_got
<32, false>();
678 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
680 | elfcpp::SHF_WRITE
),
681 this->got_
, ORDER_RELRO_LAST
, true);
683 this->got_plt_
= new Output_data_space(4, "** GOT PLT");
684 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
686 | elfcpp::SHF_WRITE
),
687 this->got_plt_
, ORDER_NON_RELRO_FIRST
,
690 // The first three entries are reserved.
691 this->got_plt_
->set_current_data_size(3 * 4);
693 // Those bytes can go into the relro segment.
694 layout
->increase_relro(3 * 4);
696 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
697 this->global_offset_table_
=
698 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
699 Symbol_table::PREDEFINED
,
701 0, 0, elfcpp::STT_OBJECT
,
703 elfcpp::STV_HIDDEN
, 0,
706 // If there are any TLSDESC relocations, they get GOT entries in
707 // .got.plt after the jump slot entries.
708 this->got_tlsdesc_
= new Output_data_got
<32, false>();
709 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
711 | elfcpp::SHF_WRITE
),
713 ORDER_NON_RELRO_FIRST
, false);
719 // Get the dynamic reloc section, creating it if necessary.
721 Target_i386::Reloc_section
*
722 Target_i386::rel_dyn_section(Layout
* layout
)
724 if (this->rel_dyn_
== NULL
)
726 gold_assert(layout
!= NULL
);
727 this->rel_dyn_
= new Reloc_section(parameters
->options().combreloc());
728 layout
->add_output_section_data(".rel.dyn", elfcpp::SHT_REL
,
729 elfcpp::SHF_ALLOC
, this->rel_dyn_
,
730 ORDER_DYNAMIC_RELOCS
, false);
732 return this->rel_dyn_
;
735 // Create the PLT section. The ordinary .got section is an argument,
736 // since we need to refer to the start. We also create our own .got
737 // section just for PLT entries.
739 Output_data_plt_i386::Output_data_plt_i386(Symbol_table
* symtab
,
741 Output_data_space
* got_plt
)
742 : Output_section_data(16), tls_desc_rel_(NULL
), got_plt_(got_plt
), count_(0),
743 global_ifuncs_(), local_ifuncs_()
745 this->rel_
= new Reloc_section(false);
746 layout
->add_output_section_data(".rel.plt", elfcpp::SHT_REL
,
747 elfcpp::SHF_ALLOC
, this->rel_
,
748 ORDER_DYNAMIC_PLT_RELOCS
, false);
750 if (parameters
->doing_static_link())
752 // A statically linked executable will only have a .rel.plt
753 // section to hold R_386_IRELATIVE relocs for STT_GNU_IFUNC
754 // symbols. The library will use these symbols to locate the
755 // IRELATIVE relocs at program startup time.
756 symtab
->define_in_output_data("__rel_iplt_start", NULL
,
757 Symbol_table::PREDEFINED
,
758 this->rel_
, 0, 0, elfcpp::STT_NOTYPE
,
759 elfcpp::STB_GLOBAL
, elfcpp::STV_HIDDEN
,
761 symtab
->define_in_output_data("__rel_iplt_end", NULL
,
762 Symbol_table::PREDEFINED
,
763 this->rel_
, 0, 0, elfcpp::STT_NOTYPE
,
764 elfcpp::STB_GLOBAL
, elfcpp::STV_HIDDEN
,
768 // Add unwind information if requested.
769 if (parameters
->options().ld_generated_unwind_info())
770 layout
->add_eh_frame_for_plt(this, plt_eh_frame_cie
, plt_eh_frame_cie_size
,
771 plt_eh_frame_fde
, plt_eh_frame_fde_size
);
775 Output_data_plt_i386::do_adjust_output_section(Output_section
* os
)
777 // UnixWare sets the entsize of .plt to 4, and so does the old GNU
778 // linker, and so do we.
782 // Add an entry to the PLT.
785 Output_data_plt_i386::add_entry(Symbol
* gsym
)
787 gold_assert(!gsym
->has_plt_offset());
789 // Note that when setting the PLT offset we skip the initial
790 // reserved PLT entry.
791 gsym
->set_plt_offset((this->count_
+ 1) * plt_entry_size
);
795 section_offset_type got_offset
= this->got_plt_
->current_data_size();
797 // Every PLT entry needs a GOT entry which points back to the PLT
798 // entry (this will be changed by the dynamic linker, normally
799 // lazily when the function is called).
800 this->got_plt_
->set_current_data_size(got_offset
+ 4);
802 // Every PLT entry needs a reloc.
803 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
804 && gsym
->can_use_relative_reloc(false))
806 this->rel_
->add_symbolless_global_addend(gsym
, elfcpp::R_386_IRELATIVE
,
807 this->got_plt_
, got_offset
);
808 struct Global_ifunc gi
;
810 gi
.got_offset
= got_offset
;
811 this->global_ifuncs_
.push_back(gi
);
815 gsym
->set_needs_dynsym_entry();
816 this->rel_
->add_global(gsym
, elfcpp::R_386_JUMP_SLOT
, this->got_plt_
,
820 // Note that we don't need to save the symbol. The contents of the
821 // PLT are independent of which symbols are used. The symbols only
822 // appear in the relocations.
825 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
829 Output_data_plt_i386::add_local_ifunc_entry(
830 Sized_relobj_file
<32, false>* relobj
,
831 unsigned int local_sym_index
)
833 unsigned int plt_offset
= (this->count_
+ 1) * plt_entry_size
;
836 section_offset_type got_offset
= this->got_plt_
->current_data_size();
838 // Every PLT entry needs a GOT entry which points back to the PLT
840 this->got_plt_
->set_current_data_size(got_offset
+ 4);
842 // Every PLT entry needs a reloc.
843 this->rel_
->add_symbolless_local_addend(relobj
, local_sym_index
,
844 elfcpp::R_386_IRELATIVE
,
845 this->got_plt_
, got_offset
);
847 struct Local_ifunc li
;
849 li
.local_sym_index
= local_sym_index
;
850 li
.got_offset
= got_offset
;
851 this->local_ifuncs_
.push_back(li
);
856 // Return where the TLS_DESC relocations should go, creating it if
857 // necessary. These follow the JUMP_SLOT relocations.
859 Output_data_plt_i386::Reloc_section
*
860 Output_data_plt_i386::rel_tls_desc(Layout
* layout
)
862 if (this->tls_desc_rel_
== NULL
)
864 this->tls_desc_rel_
= new Reloc_section(false);
865 layout
->add_output_section_data(".rel.plt", elfcpp::SHT_REL
,
866 elfcpp::SHF_ALLOC
, this->tls_desc_rel_
,
867 ORDER_DYNAMIC_PLT_RELOCS
, false);
868 gold_assert(this->tls_desc_rel_
->output_section() ==
869 this->rel_
->output_section());
871 return this->tls_desc_rel_
;
874 // The first entry in the PLT for an executable.
876 const unsigned char Output_data_plt_i386::exec_first_plt_entry
[plt_entry_size
] =
878 0xff, 0x35, // pushl contents of memory address
879 0, 0, 0, 0, // replaced with address of .got + 4
880 0xff, 0x25, // jmp indirect
881 0, 0, 0, 0, // replaced with address of .got + 8
885 // The first entry in the PLT for a shared object.
887 const unsigned char Output_data_plt_i386::dyn_first_plt_entry
[plt_entry_size
] =
889 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx)
890 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx)
894 // Subsequent entries in the PLT for an executable.
896 const unsigned char Output_data_plt_i386::exec_plt_entry
[plt_entry_size
] =
898 0xff, 0x25, // jmp indirect
899 0, 0, 0, 0, // replaced with address of symbol in .got
900 0x68, // pushl immediate
901 0, 0, 0, 0, // replaced with offset into relocation table
902 0xe9, // jmp relative
903 0, 0, 0, 0 // replaced with offset to start of .plt
906 // Subsequent entries in the PLT for a shared object.
908 const unsigned char Output_data_plt_i386::dyn_plt_entry
[plt_entry_size
] =
910 0xff, 0xa3, // jmp *offset(%ebx)
911 0, 0, 0, 0, // replaced with offset of symbol in .got
912 0x68, // pushl immediate
913 0, 0, 0, 0, // replaced with offset into relocation table
914 0xe9, // jmp relative
915 0, 0, 0, 0 // replaced with offset to start of .plt
918 // The .eh_frame unwind information for the PLT.
921 Output_data_plt_i386::plt_eh_frame_cie
[plt_eh_frame_cie_size
] =
924 'z', // Augmentation: augmentation size included.
925 'R', // Augmentation: FDE encoding included.
926 '\0', // End of augmentation string.
927 1, // Code alignment factor.
928 0x7c, // Data alignment factor.
929 8, // Return address column.
930 1, // Augmentation size.
931 (elfcpp::DW_EH_PE_pcrel
// FDE encoding.
932 | elfcpp::DW_EH_PE_sdata4
),
933 elfcpp::DW_CFA_def_cfa
, 4, 4, // DW_CFA_def_cfa: r4 (esp) ofs 4.
934 elfcpp::DW_CFA_offset
+ 8, 1, // DW_CFA_offset: r8 (eip) at cfa-4.
935 elfcpp::DW_CFA_nop
, // Align to 16 bytes.
940 Output_data_plt_i386::plt_eh_frame_fde
[plt_eh_frame_fde_size
] =
942 0, 0, 0, 0, // Replaced with offset to .plt.
943 0, 0, 0, 0, // Replaced with size of .plt.
944 0, // Augmentation size.
945 elfcpp::DW_CFA_def_cfa_offset
, 8, // DW_CFA_def_cfa_offset: 8.
946 elfcpp::DW_CFA_advance_loc
+ 6, // Advance 6 to __PLT__ + 6.
947 elfcpp::DW_CFA_def_cfa_offset
, 12, // DW_CFA_def_cfa_offset: 12.
948 elfcpp::DW_CFA_advance_loc
+ 10, // Advance 10 to __PLT__ + 16.
949 elfcpp::DW_CFA_def_cfa_expression
, // DW_CFA_def_cfa_expression.
951 elfcpp::DW_OP_breg4
, 4, // Push %esp + 4.
952 elfcpp::DW_OP_breg8
, 0, // Push %eip.
953 elfcpp::DW_OP_lit15
, // Push 0xf.
954 elfcpp::DW_OP_and
, // & (%eip & 0xf).
955 elfcpp::DW_OP_lit11
, // Push 0xb.
956 elfcpp::DW_OP_ge
, // >= ((%eip & 0xf) >= 0xb)
957 elfcpp::DW_OP_lit2
, // Push 2.
958 elfcpp::DW_OP_shl
, // << (((%eip & 0xf) >= 0xb) << 2)
959 elfcpp::DW_OP_plus
, // + ((((%eip&0xf)>=0xb)<<2)+%esp+4
960 elfcpp::DW_CFA_nop
, // Align to 32 bytes.
966 // Write out the PLT. This uses the hand-coded instructions above,
967 // and adjusts them as needed. This is all specified by the i386 ELF
968 // Processor Supplement.
971 Output_data_plt_i386::do_write(Output_file
* of
)
973 const off_t offset
= this->offset();
974 const section_size_type oview_size
=
975 convert_to_section_size_type(this->data_size());
976 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
978 const off_t got_file_offset
= this->got_plt_
->offset();
979 const section_size_type got_size
=
980 convert_to_section_size_type(this->got_plt_
->data_size());
981 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
984 unsigned char* pov
= oview
;
986 elfcpp::Elf_types
<32>::Elf_Addr plt_address
= this->address();
987 elfcpp::Elf_types
<32>::Elf_Addr got_address
= this->got_plt_
->address();
989 if (parameters
->options().output_is_position_independent())
990 memcpy(pov
, dyn_first_plt_entry
, plt_entry_size
);
993 memcpy(pov
, exec_first_plt_entry
, plt_entry_size
);
994 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2, got_address
+ 4);
995 elfcpp::Swap
<32, false>::writeval(pov
+ 8, got_address
+ 8);
997 pov
+= plt_entry_size
;
999 unsigned char* got_pov
= got_view
;
1001 memset(got_pov
, 0, 12);
1004 const int rel_size
= elfcpp::Elf_sizes
<32>::rel_size
;
1006 unsigned int plt_offset
= plt_entry_size
;
1007 unsigned int plt_rel_offset
= 0;
1008 unsigned int got_offset
= 12;
1009 const unsigned int count
= this->count_
;
1010 for (unsigned int i
= 0;
1013 pov
+= plt_entry_size
,
1015 plt_offset
+= plt_entry_size
,
1016 plt_rel_offset
+= rel_size
,
1019 // Set and adjust the PLT entry itself.
1021 if (parameters
->options().output_is_position_independent())
1023 memcpy(pov
, dyn_plt_entry
, plt_entry_size
);
1024 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2, got_offset
);
1028 memcpy(pov
, exec_plt_entry
, plt_entry_size
);
1029 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
1034 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 7, plt_rel_offset
);
1035 elfcpp::Swap
<32, false>::writeval(pov
+ 12,
1036 - (plt_offset
+ plt_entry_size
));
1038 // Set the entry in the GOT.
1039 elfcpp::Swap
<32, false>::writeval(got_pov
, plt_address
+ plt_offset
+ 6);
1042 // If any STT_GNU_IFUNC symbols have PLT entries, we need to change
1043 // the GOT to point to the actual symbol value, rather than point to
1044 // the PLT entry. That will let the dynamic linker call the right
1045 // function when resolving IRELATIVE relocations.
1046 for (std::vector
<Global_ifunc
>::const_iterator p
=
1047 this->global_ifuncs_
.begin();
1048 p
!= this->global_ifuncs_
.end();
1051 const Sized_symbol
<32>* ssym
=
1052 static_cast<const Sized_symbol
<32>*>(p
->sym
);
1053 elfcpp::Swap
<32, false>::writeval(got_view
+ p
->got_offset
,
1057 for (std::vector
<Local_ifunc
>::const_iterator p
=
1058 this->local_ifuncs_
.begin();
1059 p
!= this->local_ifuncs_
.end();
1062 const Symbol_value
<32>* psymval
=
1063 p
->object
->local_symbol(p
->local_sym_index
);
1064 elfcpp::Swap
<32, false>::writeval(got_view
+ p
->got_offset
,
1065 psymval
->value(p
->object
, 0));
1068 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
1069 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
1071 of
->write_output_view(offset
, oview_size
, oview
);
1072 of
->write_output_view(got_file_offset
, got_size
, got_view
);
1075 // Create the PLT section.
1078 Target_i386::make_plt_section(Symbol_table
* symtab
, Layout
* layout
)
1080 if (this->plt_
== NULL
)
1082 // Create the GOT sections first.
1083 this->got_section(symtab
, layout
);
1085 this->plt_
= new Output_data_plt_i386(symtab
, layout
, this->got_plt_
);
1086 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
1088 | elfcpp::SHF_EXECINSTR
),
1089 this->plt_
, ORDER_PLT
, false);
1091 // Make the sh_info field of .rel.plt point to .plt.
1092 Output_section
* rel_plt_os
= this->plt_
->rel_plt()->output_section();
1093 rel_plt_os
->set_info_section(this->plt_
->output_section());
1097 // Create a PLT entry for a global symbol.
1100 Target_i386::make_plt_entry(Symbol_table
* symtab
, Layout
* layout
, Symbol
* gsym
)
1102 if (gsym
->has_plt_offset())
1104 if (this->plt_
== NULL
)
1105 this->make_plt_section(symtab
, layout
);
1106 this->plt_
->add_entry(gsym
);
1109 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
1112 Target_i386::make_local_ifunc_plt_entry(Symbol_table
* symtab
, Layout
* layout
,
1113 Sized_relobj_file
<32, false>* relobj
,
1114 unsigned int local_sym_index
)
1116 if (relobj
->local_has_plt_offset(local_sym_index
))
1118 if (this->plt_
== NULL
)
1119 this->make_plt_section(symtab
, layout
);
1120 unsigned int plt_offset
= this->plt_
->add_local_ifunc_entry(relobj
,
1122 relobj
->set_local_plt_offset(local_sym_index
, plt_offset
);
1125 // Return the number of entries in the PLT.
1128 Target_i386::plt_entry_count() const
1130 if (this->plt_
== NULL
)
1132 return this->plt_
->entry_count();
1135 // Return the offset of the first non-reserved PLT entry.
1138 Target_i386::first_plt_entry_offset() const
1140 return Output_data_plt_i386::first_plt_entry_offset();
1143 // Return the size of each PLT entry.
1146 Target_i386::plt_entry_size() const
1148 return Output_data_plt_i386::get_plt_entry_size();
1151 // Get the section to use for TLS_DESC relocations.
1153 Target_i386::Reloc_section
*
1154 Target_i386::rel_tls_desc_section(Layout
* layout
) const
1156 return this->plt_section()->rel_tls_desc(layout
);
1159 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
1162 Target_i386::define_tls_base_symbol(Symbol_table
* symtab
, Layout
* layout
)
1164 if (this->tls_base_symbol_defined_
)
1167 Output_segment
* tls_segment
= layout
->tls_segment();
1168 if (tls_segment
!= NULL
)
1170 bool is_exec
= parameters
->options().output_is_executable();
1171 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
1172 Symbol_table::PREDEFINED
,
1176 elfcpp::STV_HIDDEN
, 0,
1178 ? Symbol::SEGMENT_END
1179 : Symbol::SEGMENT_START
),
1182 this->tls_base_symbol_defined_
= true;
1185 // Create a GOT entry for the TLS module index.
1188 Target_i386::got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
1189 Sized_relobj_file
<32, false>* object
)
1191 if (this->got_mod_index_offset_
== -1U)
1193 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
1194 Reloc_section
* rel_dyn
= this->rel_dyn_section(layout
);
1195 Output_data_got
<32, false>* got
= this->got_section(symtab
, layout
);
1196 unsigned int got_offset
= got
->add_constant(0);
1197 rel_dyn
->add_local(object
, 0, elfcpp::R_386_TLS_DTPMOD32
, got
,
1199 got
->add_constant(0);
1200 this->got_mod_index_offset_
= got_offset
;
1202 return this->got_mod_index_offset_
;
1205 // Optimize the TLS relocation type based on what we know about the
1206 // symbol. IS_FINAL is true if the final address of this symbol is
1207 // known at link time.
1209 tls::Tls_optimization
1210 Target_i386::optimize_tls_reloc(bool is_final
, int r_type
)
1212 // If we are generating a shared library, then we can't do anything
1214 if (parameters
->options().shared())
1215 return tls::TLSOPT_NONE
;
1219 case elfcpp::R_386_TLS_GD
:
1220 case elfcpp::R_386_TLS_GOTDESC
:
1221 case elfcpp::R_386_TLS_DESC_CALL
:
1222 // These are General-Dynamic which permits fully general TLS
1223 // access. Since we know that we are generating an executable,
1224 // we can convert this to Initial-Exec. If we also know that
1225 // this is a local symbol, we can further switch to Local-Exec.
1227 return tls::TLSOPT_TO_LE
;
1228 return tls::TLSOPT_TO_IE
;
1230 case elfcpp::R_386_TLS_LDM
:
1231 // This is Local-Dynamic, which refers to a local symbol in the
1232 // dynamic TLS block. Since we know that we generating an
1233 // executable, we can switch to Local-Exec.
1234 return tls::TLSOPT_TO_LE
;
1236 case elfcpp::R_386_TLS_LDO_32
:
1237 // Another type of Local-Dynamic relocation.
1238 return tls::TLSOPT_TO_LE
;
1240 case elfcpp::R_386_TLS_IE
:
1241 case elfcpp::R_386_TLS_GOTIE
:
1242 case elfcpp::R_386_TLS_IE_32
:
1243 // These are Initial-Exec relocs which get the thread offset
1244 // from the GOT. If we know that we are linking against the
1245 // local symbol, we can switch to Local-Exec, which links the
1246 // thread offset into the instruction.
1248 return tls::TLSOPT_TO_LE
;
1249 return tls::TLSOPT_NONE
;
1251 case elfcpp::R_386_TLS_LE
:
1252 case elfcpp::R_386_TLS_LE_32
:
1253 // When we already have Local-Exec, there is nothing further we
1255 return tls::TLSOPT_NONE
;
1262 // Get the Reference_flags for a particular relocation.
1265 Target_i386::Scan::get_reference_flags(unsigned int r_type
)
1269 case elfcpp::R_386_NONE
:
1270 case elfcpp::R_386_GNU_VTINHERIT
:
1271 case elfcpp::R_386_GNU_VTENTRY
:
1272 case elfcpp::R_386_GOTPC
:
1273 // No symbol reference.
1276 case elfcpp::R_386_32
:
1277 case elfcpp::R_386_16
:
1278 case elfcpp::R_386_8
:
1279 return Symbol::ABSOLUTE_REF
;
1281 case elfcpp::R_386_PC32
:
1282 case elfcpp::R_386_PC16
:
1283 case elfcpp::R_386_PC8
:
1284 case elfcpp::R_386_GOTOFF
:
1285 return Symbol::RELATIVE_REF
;
1287 case elfcpp::R_386_PLT32
:
1288 return Symbol::FUNCTION_CALL
| Symbol::RELATIVE_REF
;
1290 case elfcpp::R_386_GOT32
:
1292 return Symbol::ABSOLUTE_REF
;
1294 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1295 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
1296 case elfcpp::R_386_TLS_DESC_CALL
:
1297 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1298 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1299 case elfcpp::R_386_TLS_IE
: // Initial-exec
1300 case elfcpp::R_386_TLS_IE_32
:
1301 case elfcpp::R_386_TLS_GOTIE
:
1302 case elfcpp::R_386_TLS_LE
: // Local-exec
1303 case elfcpp::R_386_TLS_LE_32
:
1304 return Symbol::TLS_REF
;
1306 case elfcpp::R_386_COPY
:
1307 case elfcpp::R_386_GLOB_DAT
:
1308 case elfcpp::R_386_JUMP_SLOT
:
1309 case elfcpp::R_386_RELATIVE
:
1310 case elfcpp::R_386_IRELATIVE
:
1311 case elfcpp::R_386_TLS_TPOFF
:
1312 case elfcpp::R_386_TLS_DTPMOD32
:
1313 case elfcpp::R_386_TLS_DTPOFF32
:
1314 case elfcpp::R_386_TLS_TPOFF32
:
1315 case elfcpp::R_386_TLS_DESC
:
1316 case elfcpp::R_386_32PLT
:
1317 case elfcpp::R_386_TLS_GD_32
:
1318 case elfcpp::R_386_TLS_GD_PUSH
:
1319 case elfcpp::R_386_TLS_GD_CALL
:
1320 case elfcpp::R_386_TLS_GD_POP
:
1321 case elfcpp::R_386_TLS_LDM_32
:
1322 case elfcpp::R_386_TLS_LDM_PUSH
:
1323 case elfcpp::R_386_TLS_LDM_CALL
:
1324 case elfcpp::R_386_TLS_LDM_POP
:
1325 case elfcpp::R_386_USED_BY_INTEL_200
:
1327 // Not expected. We will give an error later.
1332 // Report an unsupported relocation against a local symbol.
1335 Target_i386::Scan::unsupported_reloc_local(Sized_relobj_file
<32, false>* object
,
1336 unsigned int r_type
)
1338 gold_error(_("%s: unsupported reloc %u against local symbol"),
1339 object
->name().c_str(), r_type
);
1342 // Return whether we need to make a PLT entry for a relocation of a
1343 // given type against a STT_GNU_IFUNC symbol.
1346 Target_i386::Scan::reloc_needs_plt_for_ifunc(
1347 Sized_relobj_file
<32, false>* object
,
1348 unsigned int r_type
)
1350 int flags
= Scan::get_reference_flags(r_type
);
1351 if (flags
& Symbol::TLS_REF
)
1352 gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"),
1353 object
->name().c_str(), r_type
);
1357 // Scan a relocation for a local symbol.
1360 Target_i386::Scan::local(Symbol_table
* symtab
,
1362 Target_i386
* target
,
1363 Sized_relobj_file
<32, false>* object
,
1364 unsigned int data_shndx
,
1365 Output_section
* output_section
,
1366 const elfcpp::Rel
<32, false>& reloc
,
1367 unsigned int r_type
,
1368 const elfcpp::Sym
<32, false>& lsym
)
1370 // A local STT_GNU_IFUNC symbol may require a PLT entry.
1371 if (lsym
.get_st_type() == elfcpp::STT_GNU_IFUNC
1372 && this->reloc_needs_plt_for_ifunc(object
, r_type
))
1374 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1375 target
->make_local_ifunc_plt_entry(symtab
, layout
, object
, r_sym
);
1380 case elfcpp::R_386_NONE
:
1381 case elfcpp::R_386_GNU_VTINHERIT
:
1382 case elfcpp::R_386_GNU_VTENTRY
:
1385 case elfcpp::R_386_32
:
1386 // If building a shared library (or a position-independent
1387 // executable), we need to create a dynamic relocation for
1388 // this location. The relocation applied at link time will
1389 // apply the link-time value, so we flag the location with
1390 // an R_386_RELATIVE relocation so the dynamic loader can
1391 // relocate it easily.
1392 if (parameters
->options().output_is_position_independent())
1394 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1395 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1396 rel_dyn
->add_local_relative(object
, r_sym
, elfcpp::R_386_RELATIVE
,
1397 output_section
, data_shndx
,
1398 reloc
.get_r_offset());
1402 case elfcpp::R_386_16
:
1403 case elfcpp::R_386_8
:
1404 // If building a shared library (or a position-independent
1405 // executable), we need to create a dynamic relocation for
1406 // this location. Because the addend needs to remain in the
1407 // data section, we need to be careful not to apply this
1408 // relocation statically.
1409 if (parameters
->options().output_is_position_independent())
1411 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1412 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1413 if (lsym
.get_st_type() != elfcpp::STT_SECTION
)
1414 rel_dyn
->add_local(object
, r_sym
, r_type
, output_section
,
1415 data_shndx
, reloc
.get_r_offset());
1418 gold_assert(lsym
.get_st_value() == 0);
1419 unsigned int shndx
= lsym
.get_st_shndx();
1421 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
,
1424 object
->error(_("section symbol %u has bad shndx %u"),
1427 rel_dyn
->add_local_section(object
, shndx
,
1428 r_type
, output_section
,
1429 data_shndx
, reloc
.get_r_offset());
1434 case elfcpp::R_386_PC32
:
1435 case elfcpp::R_386_PC16
:
1436 case elfcpp::R_386_PC8
:
1439 case elfcpp::R_386_PLT32
:
1440 // Since we know this is a local symbol, we can handle this as a
1444 case elfcpp::R_386_GOTOFF
:
1445 case elfcpp::R_386_GOTPC
:
1446 // We need a GOT section.
1447 target
->got_section(symtab
, layout
);
1450 case elfcpp::R_386_GOT32
:
1452 // The symbol requires a GOT entry.
1453 Output_data_got
<32, false>* got
= target
->got_section(symtab
, layout
);
1454 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1456 // For a STT_GNU_IFUNC symbol we want the PLT offset. That
1457 // lets function pointers compare correctly with shared
1458 // libraries. Otherwise we would need an IRELATIVE reloc.
1460 if (lsym
.get_st_type() == elfcpp::STT_GNU_IFUNC
)
1461 is_new
= got
->add_local_plt(object
, r_sym
, GOT_TYPE_STANDARD
);
1463 is_new
= got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
);
1466 // If we are generating a shared object, we need to add a
1467 // dynamic RELATIVE relocation for this symbol's GOT entry.
1468 if (parameters
->options().output_is_position_independent())
1470 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1471 unsigned int got_offset
=
1472 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
);
1473 rel_dyn
->add_local_relative(object
, r_sym
,
1474 elfcpp::R_386_RELATIVE
,
1481 // These are relocations which should only be seen by the
1482 // dynamic linker, and should never be seen here.
1483 case elfcpp::R_386_COPY
:
1484 case elfcpp::R_386_GLOB_DAT
:
1485 case elfcpp::R_386_JUMP_SLOT
:
1486 case elfcpp::R_386_RELATIVE
:
1487 case elfcpp::R_386_IRELATIVE
:
1488 case elfcpp::R_386_TLS_TPOFF
:
1489 case elfcpp::R_386_TLS_DTPMOD32
:
1490 case elfcpp::R_386_TLS_DTPOFF32
:
1491 case elfcpp::R_386_TLS_TPOFF32
:
1492 case elfcpp::R_386_TLS_DESC
:
1493 gold_error(_("%s: unexpected reloc %u in object file"),
1494 object
->name().c_str(), r_type
);
1497 // These are initial TLS relocs, which are expected when
1499 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1500 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
1501 case elfcpp::R_386_TLS_DESC_CALL
:
1502 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1503 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1504 case elfcpp::R_386_TLS_IE
: // Initial-exec
1505 case elfcpp::R_386_TLS_IE_32
:
1506 case elfcpp::R_386_TLS_GOTIE
:
1507 case elfcpp::R_386_TLS_LE
: // Local-exec
1508 case elfcpp::R_386_TLS_LE_32
:
1510 bool output_is_shared
= parameters
->options().shared();
1511 const tls::Tls_optimization optimized_type
1512 = Target_i386::optimize_tls_reloc(!output_is_shared
, r_type
);
1515 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1516 if (optimized_type
== tls::TLSOPT_NONE
)
1518 // Create a pair of GOT entries for the module index and
1519 // dtv-relative offset.
1520 Output_data_got
<32, false>* got
1521 = target
->got_section(symtab
, layout
);
1522 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1523 unsigned int shndx
= lsym
.get_st_shndx();
1525 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
1527 object
->error(_("local symbol %u has bad shndx %u"),
1530 got
->add_local_pair_with_rel(object
, r_sym
, shndx
,
1532 target
->rel_dyn_section(layout
),
1533 elfcpp::R_386_TLS_DTPMOD32
, 0);
1535 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1536 unsupported_reloc_local(object
, r_type
);
1539 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva)
1540 target
->define_tls_base_symbol(symtab
, layout
);
1541 if (optimized_type
== tls::TLSOPT_NONE
)
1543 // Create a double GOT entry with an R_386_TLS_DESC
1544 // reloc. The R_386_TLS_DESC reloc is resolved
1545 // lazily, so the GOT entry needs to be in an area in
1546 // .got.plt, not .got. Call got_section to make sure
1547 // the section has been created.
1548 target
->got_section(symtab
, layout
);
1549 Output_data_got
<32, false>* got
= target
->got_tlsdesc_section();
1550 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1551 if (!object
->local_has_got_offset(r_sym
, GOT_TYPE_TLS_DESC
))
1553 unsigned int got_offset
= got
->add_constant(0);
1554 // The local symbol value is stored in the second
1556 got
->add_local(object
, r_sym
, GOT_TYPE_TLS_DESC
);
1557 // That set the GOT offset of the local symbol to
1558 // point to the second entry, but we want it to
1559 // point to the first.
1560 object
->set_local_got_offset(r_sym
, GOT_TYPE_TLS_DESC
,
1562 Reloc_section
* rt
= target
->rel_tls_desc_section(layout
);
1563 rt
->add_absolute(elfcpp::R_386_TLS_DESC
, got
, got_offset
);
1566 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1567 unsupported_reloc_local(object
, r_type
);
1570 case elfcpp::R_386_TLS_DESC_CALL
:
1573 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1574 if (optimized_type
== tls::TLSOPT_NONE
)
1576 // Create a GOT entry for the module index.
1577 target
->got_mod_index_entry(symtab
, layout
, object
);
1579 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1580 unsupported_reloc_local(object
, r_type
);
1583 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1586 case elfcpp::R_386_TLS_IE
: // Initial-exec
1587 case elfcpp::R_386_TLS_IE_32
:
1588 case elfcpp::R_386_TLS_GOTIE
:
1589 layout
->set_has_static_tls();
1590 if (optimized_type
== tls::TLSOPT_NONE
)
1592 // For the R_386_TLS_IE relocation, we need to create a
1593 // dynamic relocation when building a shared library.
1594 if (r_type
== elfcpp::R_386_TLS_IE
1595 && parameters
->options().shared())
1597 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1599 = elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1600 rel_dyn
->add_local_relative(object
, r_sym
,
1601 elfcpp::R_386_RELATIVE
,
1602 output_section
, data_shndx
,
1603 reloc
.get_r_offset());
1605 // Create a GOT entry for the tp-relative offset.
1606 Output_data_got
<32, false>* got
1607 = target
->got_section(symtab
, layout
);
1608 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1609 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_IE_32
1610 ? elfcpp::R_386_TLS_TPOFF32
1611 : elfcpp::R_386_TLS_TPOFF
);
1612 unsigned int got_type
= (r_type
== elfcpp::R_386_TLS_IE_32
1613 ? GOT_TYPE_TLS_OFFSET
1614 : GOT_TYPE_TLS_NOFFSET
);
1615 got
->add_local_with_rel(object
, r_sym
, got_type
,
1616 target
->rel_dyn_section(layout
),
1619 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1620 unsupported_reloc_local(object
, r_type
);
1623 case elfcpp::R_386_TLS_LE
: // Local-exec
1624 case elfcpp::R_386_TLS_LE_32
:
1625 layout
->set_has_static_tls();
1626 if (output_is_shared
)
1628 // We need to create a dynamic relocation.
1629 gold_assert(lsym
.get_st_type() != elfcpp::STT_SECTION
);
1630 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1631 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_LE_32
1632 ? elfcpp::R_386_TLS_TPOFF32
1633 : elfcpp::R_386_TLS_TPOFF
);
1634 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1635 rel_dyn
->add_local(object
, r_sym
, dyn_r_type
, output_section
,
1636 data_shndx
, reloc
.get_r_offset());
1646 case elfcpp::R_386_32PLT
:
1647 case elfcpp::R_386_TLS_GD_32
:
1648 case elfcpp::R_386_TLS_GD_PUSH
:
1649 case elfcpp::R_386_TLS_GD_CALL
:
1650 case elfcpp::R_386_TLS_GD_POP
:
1651 case elfcpp::R_386_TLS_LDM_32
:
1652 case elfcpp::R_386_TLS_LDM_PUSH
:
1653 case elfcpp::R_386_TLS_LDM_CALL
:
1654 case elfcpp::R_386_TLS_LDM_POP
:
1655 case elfcpp::R_386_USED_BY_INTEL_200
:
1657 unsupported_reloc_local(object
, r_type
);
1662 // Report an unsupported relocation against a global symbol.
1665 Target_i386::Scan::unsupported_reloc_global(
1666 Sized_relobj_file
<32, false>* object
,
1667 unsigned int r_type
,
1670 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1671 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
1675 Target_i386::Scan::possible_function_pointer_reloc(unsigned int r_type
)
1679 case elfcpp::R_386_32
:
1680 case elfcpp::R_386_16
:
1681 case elfcpp::R_386_8
:
1682 case elfcpp::R_386_GOTOFF
:
1683 case elfcpp::R_386_GOT32
:
1694 Target_i386::Scan::local_reloc_may_be_function_pointer(
1698 Sized_relobj_file
<32, false>* ,
1701 const elfcpp::Rel
<32, false>& ,
1702 unsigned int r_type
,
1703 const elfcpp::Sym
<32, false>&)
1705 return possible_function_pointer_reloc(r_type
);
1709 Target_i386::Scan::global_reloc_may_be_function_pointer(
1713 Sized_relobj_file
<32, false>* ,
1716 const elfcpp::Rel
<32, false>& ,
1717 unsigned int r_type
,
1720 return possible_function_pointer_reloc(r_type
);
1723 // Scan a relocation for a global symbol.
1726 Target_i386::Scan::global(Symbol_table
* symtab
,
1728 Target_i386
* target
,
1729 Sized_relobj_file
<32, false>* object
,
1730 unsigned int data_shndx
,
1731 Output_section
* output_section
,
1732 const elfcpp::Rel
<32, false>& reloc
,
1733 unsigned int r_type
,
1736 // A STT_GNU_IFUNC symbol may require a PLT entry.
1737 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
1738 && this->reloc_needs_plt_for_ifunc(object
, r_type
))
1739 target
->make_plt_entry(symtab
, layout
, gsym
);
1743 case elfcpp::R_386_NONE
:
1744 case elfcpp::R_386_GNU_VTINHERIT
:
1745 case elfcpp::R_386_GNU_VTENTRY
:
1748 case elfcpp::R_386_32
:
1749 case elfcpp::R_386_16
:
1750 case elfcpp::R_386_8
:
1752 // Make a PLT entry if necessary.
1753 if (gsym
->needs_plt_entry())
1755 target
->make_plt_entry(symtab
, layout
, gsym
);
1756 // Since this is not a PC-relative relocation, we may be
1757 // taking the address of a function. In that case we need to
1758 // set the entry in the dynamic symbol table to the address of
1760 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
1761 gsym
->set_needs_dynsym_value();
1763 // Make a dynamic relocation if necessary.
1764 if (gsym
->needs_dynamic_reloc(Scan::get_reference_flags(r_type
)))
1766 if (gsym
->may_need_copy_reloc())
1768 target
->copy_reloc(symtab
, layout
, object
,
1769 data_shndx
, output_section
, gsym
, reloc
);
1771 else if (r_type
== elfcpp::R_386_32
1772 && gsym
->type() == elfcpp::STT_GNU_IFUNC
1773 && gsym
->can_use_relative_reloc(false)
1774 && !gsym
->is_from_dynobj()
1775 && !gsym
->is_undefined()
1776 && !gsym
->is_preemptible())
1778 // Use an IRELATIVE reloc for a locally defined
1779 // STT_GNU_IFUNC symbol. This makes a function
1780 // address in a PIE executable match the address in a
1781 // shared library that it links against.
1782 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1783 rel_dyn
->add_symbolless_global_addend(gsym
,
1784 elfcpp::R_386_IRELATIVE
,
1787 reloc
.get_r_offset());
1789 else if (r_type
== elfcpp::R_386_32
1790 && gsym
->can_use_relative_reloc(false))
1792 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1793 rel_dyn
->add_global_relative(gsym
, elfcpp::R_386_RELATIVE
,
1794 output_section
, object
,
1795 data_shndx
, reloc
.get_r_offset());
1799 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1800 rel_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1801 data_shndx
, reloc
.get_r_offset());
1807 case elfcpp::R_386_PC32
:
1808 case elfcpp::R_386_PC16
:
1809 case elfcpp::R_386_PC8
:
1811 // Make a PLT entry if necessary.
1812 if (gsym
->needs_plt_entry())
1814 // These relocations are used for function calls only in
1815 // non-PIC code. For a 32-bit relocation in a shared library,
1816 // we'll need a text relocation anyway, so we can skip the
1817 // PLT entry and let the dynamic linker bind the call directly
1818 // to the target. For smaller relocations, we should use a
1819 // PLT entry to ensure that the call can reach.
1820 if (!parameters
->options().shared()
1821 || r_type
!= elfcpp::R_386_PC32
)
1822 target
->make_plt_entry(symtab
, layout
, gsym
);
1824 // Make a dynamic relocation if necessary.
1825 if (gsym
->needs_dynamic_reloc(Scan::get_reference_flags(r_type
)))
1827 if (gsym
->may_need_copy_reloc())
1829 target
->copy_reloc(symtab
, layout
, object
,
1830 data_shndx
, output_section
, gsym
, reloc
);
1834 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1835 rel_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1836 data_shndx
, reloc
.get_r_offset());
1842 case elfcpp::R_386_GOT32
:
1844 // The symbol requires a GOT entry.
1845 Output_data_got
<32, false>* got
= target
->got_section(symtab
, layout
);
1846 if (gsym
->final_value_is_known())
1848 // For a STT_GNU_IFUNC symbol we want the PLT address.
1849 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
1850 got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
1852 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
1856 // If this symbol is not fully resolved, we need to add a
1857 // GOT entry with a dynamic relocation.
1858 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1859 if (gsym
->is_from_dynobj()
1860 || gsym
->is_undefined()
1861 || gsym
->is_preemptible()
1862 || (gsym
->type() == elfcpp::STT_GNU_IFUNC
1863 && parameters
->options().output_is_position_independent()))
1864 got
->add_global_with_rel(gsym
, GOT_TYPE_STANDARD
,
1865 rel_dyn
, elfcpp::R_386_GLOB_DAT
);
1868 // For a STT_GNU_IFUNC symbol we want to write the PLT
1869 // offset into the GOT, so that function pointer
1870 // comparisons work correctly.
1872 if (gsym
->type() != elfcpp::STT_GNU_IFUNC
)
1873 is_new
= got
->add_global(gsym
, GOT_TYPE_STANDARD
);
1876 is_new
= got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
1877 // Tell the dynamic linker to use the PLT address
1878 // when resolving relocations.
1879 if (gsym
->is_from_dynobj()
1880 && !parameters
->options().shared())
1881 gsym
->set_needs_dynsym_value();
1885 unsigned int got_off
= gsym
->got_offset(GOT_TYPE_STANDARD
);
1886 rel_dyn
->add_global_relative(gsym
, elfcpp::R_386_RELATIVE
,
1894 case elfcpp::R_386_PLT32
:
1895 // If the symbol is fully resolved, this is just a PC32 reloc.
1896 // Otherwise we need a PLT entry.
1897 if (gsym
->final_value_is_known())
1899 // If building a shared library, we can also skip the PLT entry
1900 // if the symbol is defined in the output file and is protected
1902 if (gsym
->is_defined()
1903 && !gsym
->is_from_dynobj()
1904 && !gsym
->is_preemptible())
1906 target
->make_plt_entry(symtab
, layout
, gsym
);
1909 case elfcpp::R_386_GOTOFF
:
1910 case elfcpp::R_386_GOTPC
:
1911 // We need a GOT section.
1912 target
->got_section(symtab
, layout
);
1915 // These are relocations which should only be seen by the
1916 // dynamic linker, and should never be seen here.
1917 case elfcpp::R_386_COPY
:
1918 case elfcpp::R_386_GLOB_DAT
:
1919 case elfcpp::R_386_JUMP_SLOT
:
1920 case elfcpp::R_386_RELATIVE
:
1921 case elfcpp::R_386_IRELATIVE
:
1922 case elfcpp::R_386_TLS_TPOFF
:
1923 case elfcpp::R_386_TLS_DTPMOD32
:
1924 case elfcpp::R_386_TLS_DTPOFF32
:
1925 case elfcpp::R_386_TLS_TPOFF32
:
1926 case elfcpp::R_386_TLS_DESC
:
1927 gold_error(_("%s: unexpected reloc %u in object file"),
1928 object
->name().c_str(), r_type
);
1931 // These are initial tls relocs, which are expected when
1933 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1934 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
1935 case elfcpp::R_386_TLS_DESC_CALL
:
1936 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1937 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1938 case elfcpp::R_386_TLS_IE
: // Initial-exec
1939 case elfcpp::R_386_TLS_IE_32
:
1940 case elfcpp::R_386_TLS_GOTIE
:
1941 case elfcpp::R_386_TLS_LE
: // Local-exec
1942 case elfcpp::R_386_TLS_LE_32
:
1944 const bool is_final
= gsym
->final_value_is_known();
1945 const tls::Tls_optimization optimized_type
1946 = Target_i386::optimize_tls_reloc(is_final
, r_type
);
1949 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1950 if (optimized_type
== tls::TLSOPT_NONE
)
1952 // Create a pair of GOT entries for the module index and
1953 // dtv-relative offset.
1954 Output_data_got
<32, false>* got
1955 = target
->got_section(symtab
, layout
);
1956 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_PAIR
,
1957 target
->rel_dyn_section(layout
),
1958 elfcpp::R_386_TLS_DTPMOD32
,
1959 elfcpp::R_386_TLS_DTPOFF32
);
1961 else if (optimized_type
== tls::TLSOPT_TO_IE
)
1963 // Create a GOT entry for the tp-relative offset.
1964 Output_data_got
<32, false>* got
1965 = target
->got_section(symtab
, layout
);
1966 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_NOFFSET
,
1967 target
->rel_dyn_section(layout
),
1968 elfcpp::R_386_TLS_TPOFF
);
1970 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1971 unsupported_reloc_global(object
, r_type
, gsym
);
1974 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (~oliva url)
1975 target
->define_tls_base_symbol(symtab
, layout
);
1976 if (optimized_type
== tls::TLSOPT_NONE
)
1978 // Create a double GOT entry with an R_386_TLS_DESC
1979 // reloc. The R_386_TLS_DESC reloc is resolved
1980 // lazily, so the GOT entry needs to be in an area in
1981 // .got.plt, not .got. Call got_section to make sure
1982 // the section has been created.
1983 target
->got_section(symtab
, layout
);
1984 Output_data_got
<32, false>* got
= target
->got_tlsdesc_section();
1985 Reloc_section
* rt
= target
->rel_tls_desc_section(layout
);
1986 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_DESC
, rt
,
1987 elfcpp::R_386_TLS_DESC
, 0);
1989 else if (optimized_type
== tls::TLSOPT_TO_IE
)
1991 // Create a GOT entry for the tp-relative offset.
1992 Output_data_got
<32, false>* got
1993 = target
->got_section(symtab
, layout
);
1994 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_NOFFSET
,
1995 target
->rel_dyn_section(layout
),
1996 elfcpp::R_386_TLS_TPOFF
);
1998 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1999 unsupported_reloc_global(object
, r_type
, gsym
);
2002 case elfcpp::R_386_TLS_DESC_CALL
:
2005 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
2006 if (optimized_type
== tls::TLSOPT_NONE
)
2008 // Create a GOT entry for the module index.
2009 target
->got_mod_index_entry(symtab
, layout
, object
);
2011 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
2012 unsupported_reloc_global(object
, r_type
, gsym
);
2015 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
2018 case elfcpp::R_386_TLS_IE
: // Initial-exec
2019 case elfcpp::R_386_TLS_IE_32
:
2020 case elfcpp::R_386_TLS_GOTIE
:
2021 layout
->set_has_static_tls();
2022 if (optimized_type
== tls::TLSOPT_NONE
)
2024 // For the R_386_TLS_IE relocation, we need to create a
2025 // dynamic relocation when building a shared library.
2026 if (r_type
== elfcpp::R_386_TLS_IE
2027 && parameters
->options().shared())
2029 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
2030 rel_dyn
->add_global_relative(gsym
, elfcpp::R_386_RELATIVE
,
2031 output_section
, object
,
2033 reloc
.get_r_offset());
2035 // Create a GOT entry for the tp-relative offset.
2036 Output_data_got
<32, false>* got
2037 = target
->got_section(symtab
, layout
);
2038 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_IE_32
2039 ? elfcpp::R_386_TLS_TPOFF32
2040 : elfcpp::R_386_TLS_TPOFF
);
2041 unsigned int got_type
= (r_type
== elfcpp::R_386_TLS_IE_32
2042 ? GOT_TYPE_TLS_OFFSET
2043 : GOT_TYPE_TLS_NOFFSET
);
2044 got
->add_global_with_rel(gsym
, got_type
,
2045 target
->rel_dyn_section(layout
),
2048 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
2049 unsupported_reloc_global(object
, r_type
, gsym
);
2052 case elfcpp::R_386_TLS_LE
: // Local-exec
2053 case elfcpp::R_386_TLS_LE_32
:
2054 layout
->set_has_static_tls();
2055 if (parameters
->options().shared())
2057 // We need to create a dynamic relocation.
2058 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_LE_32
2059 ? elfcpp::R_386_TLS_TPOFF32
2060 : elfcpp::R_386_TLS_TPOFF
);
2061 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
2062 rel_dyn
->add_global(gsym
, dyn_r_type
, output_section
, object
,
2063 data_shndx
, reloc
.get_r_offset());
2073 case elfcpp::R_386_32PLT
:
2074 case elfcpp::R_386_TLS_GD_32
:
2075 case elfcpp::R_386_TLS_GD_PUSH
:
2076 case elfcpp::R_386_TLS_GD_CALL
:
2077 case elfcpp::R_386_TLS_GD_POP
:
2078 case elfcpp::R_386_TLS_LDM_32
:
2079 case elfcpp::R_386_TLS_LDM_PUSH
:
2080 case elfcpp::R_386_TLS_LDM_CALL
:
2081 case elfcpp::R_386_TLS_LDM_POP
:
2082 case elfcpp::R_386_USED_BY_INTEL_200
:
2084 unsupported_reloc_global(object
, r_type
, gsym
);
2089 // Process relocations for gc.
2092 Target_i386::gc_process_relocs(Symbol_table
* symtab
,
2094 Sized_relobj_file
<32, false>* object
,
2095 unsigned int data_shndx
,
2097 const unsigned char* prelocs
,
2099 Output_section
* output_section
,
2100 bool needs_special_offset_handling
,
2101 size_t local_symbol_count
,
2102 const unsigned char* plocal_symbols
)
2104 gold::gc_process_relocs
<32, false, Target_i386
, elfcpp::SHT_REL
,
2106 Target_i386::Relocatable_size_for_reloc
>(
2115 needs_special_offset_handling
,
2120 // Scan relocations for a section.
2123 Target_i386::scan_relocs(Symbol_table
* symtab
,
2125 Sized_relobj_file
<32, false>* object
,
2126 unsigned int data_shndx
,
2127 unsigned int sh_type
,
2128 const unsigned char* prelocs
,
2130 Output_section
* output_section
,
2131 bool needs_special_offset_handling
,
2132 size_t local_symbol_count
,
2133 const unsigned char* plocal_symbols
)
2135 if (sh_type
== elfcpp::SHT_RELA
)
2137 gold_error(_("%s: unsupported RELA reloc section"),
2138 object
->name().c_str());
2142 gold::scan_relocs
<32, false, Target_i386
, elfcpp::SHT_REL
,
2152 needs_special_offset_handling
,
2157 // Finalize the sections.
2160 Target_i386::do_finalize_sections(
2162 const Input_objects
*,
2163 Symbol_table
* symtab
)
2165 const Reloc_section
* rel_plt
= (this->plt_
== NULL
2167 : this->plt_
->rel_plt());
2168 layout
->add_target_dynamic_tags(true, this->got_plt_
, rel_plt
,
2169 this->rel_dyn_
, true, false);
2171 // Emit any relocs we saved in an attempt to avoid generating COPY
2173 if (this->copy_relocs_
.any_saved_relocs())
2174 this->copy_relocs_
.emit(this->rel_dyn_section(layout
));
2176 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
2177 // the .got.plt section.
2178 Symbol
* sym
= this->global_offset_table_
;
2181 uint32_t data_size
= this->got_plt_
->current_data_size();
2182 symtab
->get_sized_symbol
<32>(sym
)->set_symsize(data_size
);
2186 // Return whether a direct absolute static relocation needs to be applied.
2187 // In cases where Scan::local() or Scan::global() has created
2188 // a dynamic relocation other than R_386_RELATIVE, the addend
2189 // of the relocation is carried in the data, and we must not
2190 // apply the static relocation.
2193 Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol
<32>* gsym
,
2194 unsigned int r_type
,
2196 Output_section
* output_section
)
2198 // If the output section is not allocated, then we didn't call
2199 // scan_relocs, we didn't create a dynamic reloc, and we must apply
2201 if ((output_section
->flags() & elfcpp::SHF_ALLOC
) == 0)
2204 int ref_flags
= Scan::get_reference_flags(r_type
);
2206 // For local symbols, we will have created a non-RELATIVE dynamic
2207 // relocation only if (a) the output is position independent,
2208 // (b) the relocation is absolute (not pc- or segment-relative), and
2209 // (c) the relocation is not 32 bits wide.
2211 return !(parameters
->options().output_is_position_independent()
2212 && (ref_flags
& Symbol::ABSOLUTE_REF
)
2215 // For global symbols, we use the same helper routines used in the
2216 // scan pass. If we did not create a dynamic relocation, or if we
2217 // created a RELATIVE dynamic relocation, we should apply the static
2219 bool has_dyn
= gsym
->needs_dynamic_reloc(ref_flags
);
2220 bool is_rel
= (ref_flags
& Symbol::ABSOLUTE_REF
)
2221 && gsym
->can_use_relative_reloc(ref_flags
2222 & Symbol::FUNCTION_CALL
);
2223 return !has_dyn
|| is_rel
;
2226 // Perform a relocation.
2229 Target_i386::Relocate::relocate(const Relocate_info
<32, false>* relinfo
,
2230 Target_i386
* target
,
2231 Output_section
* output_section
,
2233 const elfcpp::Rel
<32, false>& rel
,
2234 unsigned int r_type
,
2235 const Sized_symbol
<32>* gsym
,
2236 const Symbol_value
<32>* psymval
,
2237 unsigned char* view
,
2238 elfcpp::Elf_types
<32>::Elf_Addr address
,
2239 section_size_type view_size
)
2241 if (this->skip_call_tls_get_addr_
)
2243 if ((r_type
!= elfcpp::R_386_PLT32
2244 && r_type
!= elfcpp::R_386_PC32
)
2246 || strcmp(gsym
->name(), "___tls_get_addr") != 0)
2247 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2248 _("missing expected TLS relocation"));
2251 this->skip_call_tls_get_addr_
= false;
2256 const Sized_relobj_file
<32, false>* object
= relinfo
->object
;
2258 // Pick the value to use for symbols defined in shared objects.
2259 Symbol_value
<32> symval
;
2261 && gsym
->type() == elfcpp::STT_GNU_IFUNC
2262 && r_type
== elfcpp::R_386_32
2263 && gsym
->needs_dynamic_reloc(Scan::get_reference_flags(r_type
))
2264 && gsym
->can_use_relative_reloc(false)
2265 && !gsym
->is_from_dynobj()
2266 && !gsym
->is_undefined()
2267 && !gsym
->is_preemptible())
2269 // In this case we are generating a R_386_IRELATIVE reloc. We
2270 // want to use the real value of the symbol, not the PLT offset.
2272 else if (gsym
!= NULL
2273 && gsym
->use_plt_offset(Scan::get_reference_flags(r_type
)))
2275 symval
.set_output_value(target
->plt_section()->address()
2276 + gsym
->plt_offset());
2279 else if (gsym
== NULL
&& psymval
->is_ifunc_symbol())
2281 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
2282 if (object
->local_has_plt_offset(r_sym
))
2284 symval
.set_output_value(target
->plt_section()->address()
2285 + object
->local_plt_offset(r_sym
));
2290 // Get the GOT offset if needed.
2291 // The GOT pointer points to the end of the GOT section.
2292 // We need to subtract the size of the GOT section to get
2293 // the actual offset to use in the relocation.
2294 bool have_got_offset
= false;
2295 unsigned int got_offset
= 0;
2298 case elfcpp::R_386_GOT32
:
2301 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
2302 got_offset
= (gsym
->got_offset(GOT_TYPE_STANDARD
)
2303 - target
->got_size());
2307 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
2308 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
2309 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
2310 - target
->got_size());
2312 have_got_offset
= true;
2321 case elfcpp::R_386_NONE
:
2322 case elfcpp::R_386_GNU_VTINHERIT
:
2323 case elfcpp::R_386_GNU_VTENTRY
:
2326 case elfcpp::R_386_32
:
2327 if (should_apply_static_reloc(gsym
, r_type
, true, output_section
))
2328 Relocate_functions
<32, false>::rel32(view
, object
, psymval
);
2331 case elfcpp::R_386_PC32
:
2332 if (should_apply_static_reloc(gsym
, r_type
, true, output_section
))
2333 Relocate_functions
<32, false>::pcrel32(view
, object
, psymval
, address
);
2336 case elfcpp::R_386_16
:
2337 if (should_apply_static_reloc(gsym
, r_type
, false, output_section
))
2338 Relocate_functions
<32, false>::rel16(view
, object
, psymval
);
2341 case elfcpp::R_386_PC16
:
2342 if (should_apply_static_reloc(gsym
, r_type
, false, output_section
))
2343 Relocate_functions
<32, false>::pcrel16(view
, object
, psymval
, address
);
2346 case elfcpp::R_386_8
:
2347 if (should_apply_static_reloc(gsym
, r_type
, false, output_section
))
2348 Relocate_functions
<32, false>::rel8(view
, object
, psymval
);
2351 case elfcpp::R_386_PC8
:
2352 if (should_apply_static_reloc(gsym
, r_type
, false, output_section
))
2353 Relocate_functions
<32, false>::pcrel8(view
, object
, psymval
, address
);
2356 case elfcpp::R_386_PLT32
:
2357 gold_assert(gsym
== NULL
2358 || gsym
->has_plt_offset()
2359 || gsym
->final_value_is_known()
2360 || (gsym
->is_defined()
2361 && !gsym
->is_from_dynobj()
2362 && !gsym
->is_preemptible()));
2363 Relocate_functions
<32, false>::pcrel32(view
, object
, psymval
, address
);
2366 case elfcpp::R_386_GOT32
:
2367 gold_assert(have_got_offset
);
2368 Relocate_functions
<32, false>::rel32(view
, got_offset
);
2371 case elfcpp::R_386_GOTOFF
:
2373 elfcpp::Elf_types
<32>::Elf_Addr value
;
2374 value
= (psymval
->value(object
, 0)
2375 - target
->got_plt_section()->address());
2376 Relocate_functions
<32, false>::rel32(view
, value
);
2380 case elfcpp::R_386_GOTPC
:
2382 elfcpp::Elf_types
<32>::Elf_Addr value
;
2383 value
= target
->got_plt_section()->address();
2384 Relocate_functions
<32, false>::pcrel32(view
, value
, address
);
2388 case elfcpp::R_386_COPY
:
2389 case elfcpp::R_386_GLOB_DAT
:
2390 case elfcpp::R_386_JUMP_SLOT
:
2391 case elfcpp::R_386_RELATIVE
:
2392 case elfcpp::R_386_IRELATIVE
:
2393 // These are outstanding tls relocs, which are unexpected when
2395 case elfcpp::R_386_TLS_TPOFF
:
2396 case elfcpp::R_386_TLS_DTPMOD32
:
2397 case elfcpp::R_386_TLS_DTPOFF32
:
2398 case elfcpp::R_386_TLS_TPOFF32
:
2399 case elfcpp::R_386_TLS_DESC
:
2400 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2401 _("unexpected reloc %u in object file"),
2405 // These are initial tls relocs, which are expected when
2407 case elfcpp::R_386_TLS_GD
: // Global-dynamic
2408 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
2409 case elfcpp::R_386_TLS_DESC_CALL
:
2410 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
2411 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
2412 case elfcpp::R_386_TLS_IE
: // Initial-exec
2413 case elfcpp::R_386_TLS_IE_32
:
2414 case elfcpp::R_386_TLS_GOTIE
:
2415 case elfcpp::R_386_TLS_LE
: // Local-exec
2416 case elfcpp::R_386_TLS_LE_32
:
2417 this->relocate_tls(relinfo
, target
, relnum
, rel
, r_type
, gsym
, psymval
,
2418 view
, address
, view_size
);
2421 case elfcpp::R_386_32PLT
:
2422 case elfcpp::R_386_TLS_GD_32
:
2423 case elfcpp::R_386_TLS_GD_PUSH
:
2424 case elfcpp::R_386_TLS_GD_CALL
:
2425 case elfcpp::R_386_TLS_GD_POP
:
2426 case elfcpp::R_386_TLS_LDM_32
:
2427 case elfcpp::R_386_TLS_LDM_PUSH
:
2428 case elfcpp::R_386_TLS_LDM_CALL
:
2429 case elfcpp::R_386_TLS_LDM_POP
:
2430 case elfcpp::R_386_USED_BY_INTEL_200
:
2432 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2433 _("unsupported reloc %u"),
2441 // Perform a TLS relocation.
2444 Target_i386::Relocate::relocate_tls(const Relocate_info
<32, false>* relinfo
,
2445 Target_i386
* target
,
2447 const elfcpp::Rel
<32, false>& rel
,
2448 unsigned int r_type
,
2449 const Sized_symbol
<32>* gsym
,
2450 const Symbol_value
<32>* psymval
,
2451 unsigned char* view
,
2452 elfcpp::Elf_types
<32>::Elf_Addr
,
2453 section_size_type view_size
)
2455 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
2457 const Sized_relobj_file
<32, false>* object
= relinfo
->object
;
2459 elfcpp::Elf_types
<32>::Elf_Addr value
= psymval
->value(object
, 0);
2461 const bool is_final
= (gsym
== NULL
2462 ? !parameters
->options().shared()
2463 : gsym
->final_value_is_known());
2464 const tls::Tls_optimization optimized_type
2465 = Target_i386::optimize_tls_reloc(is_final
, r_type
);
2468 case elfcpp::R_386_TLS_GD
: // Global-dynamic
2469 if (optimized_type
== tls::TLSOPT_TO_LE
)
2471 gold_assert(tls_segment
!= NULL
);
2472 this->tls_gd_to_le(relinfo
, relnum
, tls_segment
,
2473 rel
, r_type
, value
, view
,
2479 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
2480 ? GOT_TYPE_TLS_NOFFSET
2481 : GOT_TYPE_TLS_PAIR
);
2482 unsigned int got_offset
;
2485 gold_assert(gsym
->has_got_offset(got_type
));
2486 got_offset
= gsym
->got_offset(got_type
) - target
->got_size();
2490 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
2491 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
2492 got_offset
= (object
->local_got_offset(r_sym
, got_type
)
2493 - target
->got_size());
2495 if (optimized_type
== tls::TLSOPT_TO_IE
)
2497 gold_assert(tls_segment
!= NULL
);
2498 this->tls_gd_to_ie(relinfo
, relnum
, tls_segment
, rel
, r_type
,
2499 got_offset
, view
, view_size
);
2502 else if (optimized_type
== tls::TLSOPT_NONE
)
2504 // Relocate the field with the offset of the pair of GOT
2506 Relocate_functions
<32, false>::rel32(view
, got_offset
);
2510 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2511 _("unsupported reloc %u"),
2515 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
2516 case elfcpp::R_386_TLS_DESC_CALL
:
2517 this->local_dynamic_type_
= LOCAL_DYNAMIC_GNU
;
2518 if (optimized_type
== tls::TLSOPT_TO_LE
)
2520 gold_assert(tls_segment
!= NULL
);
2521 this->tls_desc_gd_to_le(relinfo
, relnum
, tls_segment
,
2522 rel
, r_type
, value
, view
,
2528 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
2529 ? GOT_TYPE_TLS_NOFFSET
2530 : GOT_TYPE_TLS_DESC
);
2531 unsigned int got_offset
= 0;
2532 if (r_type
== elfcpp::R_386_TLS_GOTDESC
2533 && optimized_type
== tls::TLSOPT_NONE
)
2535 // We created GOT entries in the .got.tlsdesc portion of
2536 // the .got.plt section, but the offset stored in the
2537 // symbol is the offset within .got.tlsdesc.
2538 got_offset
= (target
->got_size()
2539 + target
->got_plt_section()->data_size());
2543 gold_assert(gsym
->has_got_offset(got_type
));
2544 got_offset
+= gsym
->got_offset(got_type
) - target
->got_size();
2548 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
2549 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
2550 got_offset
+= (object
->local_got_offset(r_sym
, got_type
)
2551 - target
->got_size());
2553 if (optimized_type
== tls::TLSOPT_TO_IE
)
2555 gold_assert(tls_segment
!= NULL
);
2556 this->tls_desc_gd_to_ie(relinfo
, relnum
, tls_segment
, rel
, r_type
,
2557 got_offset
, view
, view_size
);
2560 else if (optimized_type
== tls::TLSOPT_NONE
)
2562 if (r_type
== elfcpp::R_386_TLS_GOTDESC
)
2564 // Relocate the field with the offset of the pair of GOT
2566 Relocate_functions
<32, false>::rel32(view
, got_offset
);
2571 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2572 _("unsupported reloc %u"),
2576 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
2577 if (this->local_dynamic_type_
== LOCAL_DYNAMIC_SUN
)
2579 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2580 _("both SUN and GNU model "
2581 "TLS relocations"));
2584 this->local_dynamic_type_
= LOCAL_DYNAMIC_GNU
;
2585 if (optimized_type
== tls::TLSOPT_TO_LE
)
2587 gold_assert(tls_segment
!= NULL
);
2588 this->tls_ld_to_le(relinfo
, relnum
, tls_segment
, rel
, r_type
,
2589 value
, view
, view_size
);
2592 else if (optimized_type
== tls::TLSOPT_NONE
)
2594 // Relocate the field with the offset of the GOT entry for
2595 // the module index.
2596 unsigned int got_offset
;
2597 got_offset
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
)
2598 - target
->got_size());
2599 Relocate_functions
<32, false>::rel32(view
, got_offset
);
2602 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2603 _("unsupported reloc %u"),
2607 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
2608 if (optimized_type
== tls::TLSOPT_TO_LE
)
2610 // This reloc can appear in debugging sections, in which
2611 // case we must not convert to local-exec. We decide what
2612 // to do based on whether the section is marked as
2613 // containing executable code. That is what the GNU linker
2615 elfcpp::Shdr
<32, false> shdr(relinfo
->data_shdr
);
2616 if ((shdr
.get_sh_flags() & elfcpp::SHF_EXECINSTR
) != 0)
2618 gold_assert(tls_segment
!= NULL
);
2619 value
-= tls_segment
->memsz();
2622 Relocate_functions
<32, false>::rel32(view
, value
);
2625 case elfcpp::R_386_TLS_IE
: // Initial-exec
2626 case elfcpp::R_386_TLS_GOTIE
:
2627 case elfcpp::R_386_TLS_IE_32
:
2628 if (optimized_type
== tls::TLSOPT_TO_LE
)
2630 gold_assert(tls_segment
!= NULL
);
2631 Target_i386::Relocate::tls_ie_to_le(relinfo
, relnum
, tls_segment
,
2632 rel
, r_type
, value
, view
,
2636 else if (optimized_type
== tls::TLSOPT_NONE
)
2638 // Relocate the field with the offset of the GOT entry for
2639 // the tp-relative offset of the symbol.
2640 unsigned int got_type
= (r_type
== elfcpp::R_386_TLS_IE_32
2641 ? GOT_TYPE_TLS_OFFSET
2642 : GOT_TYPE_TLS_NOFFSET
);
2643 unsigned int got_offset
;
2646 gold_assert(gsym
->has_got_offset(got_type
));
2647 got_offset
= gsym
->got_offset(got_type
);
2651 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
2652 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
2653 got_offset
= object
->local_got_offset(r_sym
, got_type
);
2655 // For the R_386_TLS_IE relocation, we need to apply the
2656 // absolute address of the GOT entry.
2657 if (r_type
== elfcpp::R_386_TLS_IE
)
2658 got_offset
+= target
->got_plt_section()->address();
2659 // All GOT offsets are relative to the end of the GOT.
2660 got_offset
-= target
->got_size();
2661 Relocate_functions
<32, false>::rel32(view
, got_offset
);
2664 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2665 _("unsupported reloc %u"),
2669 case elfcpp::R_386_TLS_LE
: // Local-exec
2670 // If we're creating a shared library, a dynamic relocation will
2671 // have been created for this location, so do not apply it now.
2672 if (!parameters
->options().shared())
2674 gold_assert(tls_segment
!= NULL
);
2675 value
-= tls_segment
->memsz();
2676 Relocate_functions
<32, false>::rel32(view
, value
);
2680 case elfcpp::R_386_TLS_LE_32
:
2681 // If we're creating a shared library, a dynamic relocation will
2682 // have been created for this location, so do not apply it now.
2683 if (!parameters
->options().shared())
2685 gold_assert(tls_segment
!= NULL
);
2686 value
= tls_segment
->memsz() - value
;
2687 Relocate_functions
<32, false>::rel32(view
, value
);
2693 // Do a relocation in which we convert a TLS General-Dynamic to a
2697 Target_i386::Relocate::tls_gd_to_le(const Relocate_info
<32, false>* relinfo
,
2699 Output_segment
* tls_segment
,
2700 const elfcpp::Rel
<32, false>& rel
,
2702 elfcpp::Elf_types
<32>::Elf_Addr value
,
2703 unsigned char* view
,
2704 section_size_type view_size
)
2706 // leal foo(,%reg,1),%eax; call ___tls_get_addr
2707 // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
2708 // leal foo(%reg),%eax; call ___tls_get_addr
2709 // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
2711 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2712 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 9);
2714 unsigned char op1
= view
[-1];
2715 unsigned char op2
= view
[-2];
2717 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2718 op2
== 0x8d || op2
== 0x04);
2719 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[4] == 0xe8);
2725 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -3);
2726 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[-3] == 0x8d);
2727 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2728 ((op1
& 0xc7) == 0x05 && op1
!= (4 << 3)));
2729 memcpy(view
- 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2733 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2734 (op1
& 0xf8) == 0x80 && (op1
& 7) != 4);
2735 if (rel
.get_r_offset() + 9 < view_size
2738 // There is a trailing nop. Use the size byte subl.
2739 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2744 // Use the five byte subl.
2745 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2749 value
= tls_segment
->memsz() - value
;
2750 Relocate_functions
<32, false>::rel32(view
+ roff
, value
);
2752 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2754 this->skip_call_tls_get_addr_
= true;
2757 // Do a relocation in which we convert a TLS General-Dynamic to an
2761 Target_i386::Relocate::tls_gd_to_ie(const Relocate_info
<32, false>* relinfo
,
2764 const elfcpp::Rel
<32, false>& rel
,
2766 elfcpp::Elf_types
<32>::Elf_Addr value
,
2767 unsigned char* view
,
2768 section_size_type view_size
)
2770 // leal foo(,%ebx,1),%eax; call ___tls_get_addr
2771 // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax
2773 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2774 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 9);
2776 unsigned char op1
= view
[-1];
2777 unsigned char op2
= view
[-2];
2779 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2780 op2
== 0x8d || op2
== 0x04);
2781 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[4] == 0xe8);
2785 // FIXME: For now, support only the first (SIB) form.
2786 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), op2
== 0x04);
2790 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -3);
2791 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[-3] == 0x8d);
2792 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2793 ((op1
& 0xc7) == 0x05 && op1
!= (4 << 3)));
2794 memcpy(view
- 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12);
2798 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2799 (op1
& 0xf8) == 0x80 && (op1
& 7) != 4);
2800 if (rel
.get_r_offset() + 9 < view_size
2803 // FIXME: This is not the right instruction sequence.
2804 // There is a trailing nop. Use the size byte subl.
2805 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2810 // FIXME: This is not the right instruction sequence.
2811 // Use the five byte subl.
2812 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2816 Relocate_functions
<32, false>::rel32(view
+ roff
, value
);
2818 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2820 this->skip_call_tls_get_addr_
= true;
2823 // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL
2824 // General-Dynamic to a Local-Exec.
2827 Target_i386::Relocate::tls_desc_gd_to_le(
2828 const Relocate_info
<32, false>* relinfo
,
2830 Output_segment
* tls_segment
,
2831 const elfcpp::Rel
<32, false>& rel
,
2832 unsigned int r_type
,
2833 elfcpp::Elf_types
<32>::Elf_Addr value
,
2834 unsigned char* view
,
2835 section_size_type view_size
)
2837 if (r_type
== elfcpp::R_386_TLS_GOTDESC
)
2839 // leal foo@TLSDESC(%ebx), %eax
2840 // ==> leal foo@NTPOFF, %eax
2841 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2842 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
2843 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2844 view
[-2] == 0x8d && view
[-1] == 0x83);
2846 value
-= tls_segment
->memsz();
2847 Relocate_functions
<32, false>::rel32(view
, value
);
2851 // call *foo@TLSCALL(%eax)
2853 gold_assert(r_type
== elfcpp::R_386_TLS_DESC_CALL
);
2854 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 2);
2855 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2856 view
[0] == 0xff && view
[1] == 0x10);
2862 // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL
2863 // General-Dynamic to an Initial-Exec.
2866 Target_i386::Relocate::tls_desc_gd_to_ie(
2867 const Relocate_info
<32, false>* relinfo
,
2870 const elfcpp::Rel
<32, false>& rel
,
2871 unsigned int r_type
,
2872 elfcpp::Elf_types
<32>::Elf_Addr value
,
2873 unsigned char* view
,
2874 section_size_type view_size
)
2876 if (r_type
== elfcpp::R_386_TLS_GOTDESC
)
2878 // leal foo@TLSDESC(%ebx), %eax
2879 // ==> movl foo@GOTNTPOFF(%ebx), %eax
2880 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2881 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
2882 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2883 view
[-2] == 0x8d && view
[-1] == 0x83);
2885 Relocate_functions
<32, false>::rel32(view
, value
);
2889 // call *foo@TLSCALL(%eax)
2891 gold_assert(r_type
== elfcpp::R_386_TLS_DESC_CALL
);
2892 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 2);
2893 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2894 view
[0] == 0xff && view
[1] == 0x10);
2900 // Do a relocation in which we convert a TLS Local-Dynamic to a
2904 Target_i386::Relocate::tls_ld_to_le(const Relocate_info
<32, false>* relinfo
,
2907 const elfcpp::Rel
<32, false>& rel
,
2909 elfcpp::Elf_types
<32>::Elf_Addr
,
2910 unsigned char* view
,
2911 section_size_type view_size
)
2913 // leal foo(%reg), %eax; call ___tls_get_addr
2914 // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi
2916 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2917 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 9);
2919 // FIXME: Does this test really always pass?
2920 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2921 view
[-2] == 0x8d && view
[-1] == 0x83);
2923 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[4] == 0xe8);
2925 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11);
2927 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2929 this->skip_call_tls_get_addr_
= true;
2932 // Do a relocation in which we convert a TLS Initial-Exec to a
2936 Target_i386::Relocate::tls_ie_to_le(const Relocate_info
<32, false>* relinfo
,
2938 Output_segment
* tls_segment
,
2939 const elfcpp::Rel
<32, false>& rel
,
2940 unsigned int r_type
,
2941 elfcpp::Elf_types
<32>::Elf_Addr value
,
2942 unsigned char* view
,
2943 section_size_type view_size
)
2945 // We have to actually change the instructions, which means that we
2946 // need to examine the opcodes to figure out which instruction we
2948 if (r_type
== elfcpp::R_386_TLS_IE
)
2950 // movl %gs:XX,%eax ==> movl $YY,%eax
2951 // movl %gs:XX,%reg ==> movl $YY,%reg
2952 // addl %gs:XX,%reg ==> addl $YY,%reg
2953 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -1);
2954 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
2956 unsigned char op1
= view
[-1];
2959 // movl XX,%eax ==> movl $YY,%eax
2964 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2966 unsigned char op2
= view
[-2];
2969 // movl XX,%reg ==> movl $YY,%reg
2970 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2971 (op1
& 0xc7) == 0x05);
2973 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
2975 else if (op2
== 0x03)
2977 // addl XX,%reg ==> addl $YY,%reg
2978 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2979 (op1
& 0xc7) == 0x05);
2981 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
2984 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), 0);
2989 // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
2990 // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
2991 // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
2992 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2993 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
2995 unsigned char op1
= view
[-1];
2996 unsigned char op2
= view
[-2];
2997 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2998 (op1
& 0xc0) == 0x80 && (op1
& 7) != 4);
3001 // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
3003 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
3005 else if (op2
== 0x2b)
3007 // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
3009 view
[-1] = 0xe8 | ((op1
>> 3) & 7);
3011 else if (op2
== 0x03)
3013 // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
3015 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
3018 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), 0);
3021 value
= tls_segment
->memsz() - value
;
3022 if (r_type
== elfcpp::R_386_TLS_IE
|| r_type
== elfcpp::R_386_TLS_GOTIE
)
3025 Relocate_functions
<32, false>::rel32(view
, value
);
3028 // Relocate section data.
3031 Target_i386::relocate_section(const Relocate_info
<32, false>* relinfo
,
3032 unsigned int sh_type
,
3033 const unsigned char* prelocs
,
3035 Output_section
* output_section
,
3036 bool needs_special_offset_handling
,
3037 unsigned char* view
,
3038 elfcpp::Elf_types
<32>::Elf_Addr address
,
3039 section_size_type view_size
,
3040 const Reloc_symbol_changes
* reloc_symbol_changes
)
3042 gold_assert(sh_type
== elfcpp::SHT_REL
);
3044 gold::relocate_section
<32, false, Target_i386
, elfcpp::SHT_REL
,
3045 Target_i386::Relocate
>(
3051 needs_special_offset_handling
,
3055 reloc_symbol_changes
);
3058 // Return the size of a relocation while scanning during a relocatable
3062 Target_i386::Relocatable_size_for_reloc::get_size_for_reloc(
3063 unsigned int r_type
,
3068 case elfcpp::R_386_NONE
:
3069 case elfcpp::R_386_GNU_VTINHERIT
:
3070 case elfcpp::R_386_GNU_VTENTRY
:
3071 case elfcpp::R_386_TLS_GD
: // Global-dynamic
3072 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
3073 case elfcpp::R_386_TLS_DESC_CALL
:
3074 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
3075 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
3076 case elfcpp::R_386_TLS_IE
: // Initial-exec
3077 case elfcpp::R_386_TLS_IE_32
:
3078 case elfcpp::R_386_TLS_GOTIE
:
3079 case elfcpp::R_386_TLS_LE
: // Local-exec
3080 case elfcpp::R_386_TLS_LE_32
:
3083 case elfcpp::R_386_32
:
3084 case elfcpp::R_386_PC32
:
3085 case elfcpp::R_386_GOT32
:
3086 case elfcpp::R_386_PLT32
:
3087 case elfcpp::R_386_GOTOFF
:
3088 case elfcpp::R_386_GOTPC
:
3091 case elfcpp::R_386_16
:
3092 case elfcpp::R_386_PC16
:
3095 case elfcpp::R_386_8
:
3096 case elfcpp::R_386_PC8
:
3099 // These are relocations which should only be seen by the
3100 // dynamic linker, and should never be seen here.
3101 case elfcpp::R_386_COPY
:
3102 case elfcpp::R_386_GLOB_DAT
:
3103 case elfcpp::R_386_JUMP_SLOT
:
3104 case elfcpp::R_386_RELATIVE
:
3105 case elfcpp::R_386_IRELATIVE
:
3106 case elfcpp::R_386_TLS_TPOFF
:
3107 case elfcpp::R_386_TLS_DTPMOD32
:
3108 case elfcpp::R_386_TLS_DTPOFF32
:
3109 case elfcpp::R_386_TLS_TPOFF32
:
3110 case elfcpp::R_386_TLS_DESC
:
3111 object
->error(_("unexpected reloc %u in object file"), r_type
);
3114 case elfcpp::R_386_32PLT
:
3115 case elfcpp::R_386_TLS_GD_32
:
3116 case elfcpp::R_386_TLS_GD_PUSH
:
3117 case elfcpp::R_386_TLS_GD_CALL
:
3118 case elfcpp::R_386_TLS_GD_POP
:
3119 case elfcpp::R_386_TLS_LDM_32
:
3120 case elfcpp::R_386_TLS_LDM_PUSH
:
3121 case elfcpp::R_386_TLS_LDM_CALL
:
3122 case elfcpp::R_386_TLS_LDM_POP
:
3123 case elfcpp::R_386_USED_BY_INTEL_200
:
3125 object
->error(_("unsupported reloc %u in object file"), r_type
);
3130 // Scan the relocs during a relocatable link.
3133 Target_i386::scan_relocatable_relocs(Symbol_table
* symtab
,
3135 Sized_relobj_file
<32, false>* object
,
3136 unsigned int data_shndx
,
3137 unsigned int sh_type
,
3138 const unsigned char* prelocs
,
3140 Output_section
* output_section
,
3141 bool needs_special_offset_handling
,
3142 size_t local_symbol_count
,
3143 const unsigned char* plocal_symbols
,
3144 Relocatable_relocs
* rr
)
3146 gold_assert(sh_type
== elfcpp::SHT_REL
);
3148 typedef gold::Default_scan_relocatable_relocs
<elfcpp::SHT_REL
,
3149 Relocatable_size_for_reloc
> Scan_relocatable_relocs
;
3151 gold::scan_relocatable_relocs
<32, false, elfcpp::SHT_REL
,
3152 Scan_relocatable_relocs
>(
3160 needs_special_offset_handling
,
3166 // Relocate a section during a relocatable link.
3169 Target_i386::relocate_for_relocatable(
3170 const Relocate_info
<32, false>* relinfo
,
3171 unsigned int sh_type
,
3172 const unsigned char* prelocs
,
3174 Output_section
* output_section
,
3175 off_t offset_in_output_section
,
3176 const Relocatable_relocs
* rr
,
3177 unsigned char* view
,
3178 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
3179 section_size_type view_size
,
3180 unsigned char* reloc_view
,
3181 section_size_type reloc_view_size
)
3183 gold_assert(sh_type
== elfcpp::SHT_REL
);
3185 gold::relocate_for_relocatable
<32, false, elfcpp::SHT_REL
>(
3190 offset_in_output_section
,
3199 // Return the value to use for a dynamic which requires special
3200 // treatment. This is how we support equality comparisons of function
3201 // pointers across shared library boundaries, as described in the
3202 // processor specific ABI supplement.
3205 Target_i386::do_dynsym_value(const Symbol
* gsym
) const
3207 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
3208 return this->plt_section()->address() + gsym
->plt_offset();
3211 // Return a string used to fill a code section with nops to take up
3212 // the specified length.
3215 Target_i386::do_code_fill(section_size_type length
) const
3219 // Build a jmp instruction to skip over the bytes.
3220 unsigned char jmp
[5];
3222 elfcpp::Swap_unaligned
<32, false>::writeval(jmp
+ 1, length
- 5);
3223 return (std::string(reinterpret_cast<char*>(&jmp
[0]), 5)
3224 + std::string(length
- 5, '\0'));
3227 // Nop sequences of various lengths.
3228 const char nop1
[1] = { 0x90 }; // nop
3229 const char nop2
[2] = { 0x66, 0x90 }; // xchg %ax %ax
3230 const char nop3
[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi
3231 const char nop4
[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi
3232 const char nop5
[5] = { 0x90, 0x8d, 0x74, 0x26, // nop
3233 0x00 }; // leal 0(%esi,1),%esi
3234 const char nop6
[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
3236 const char nop7
[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
3238 const char nop8
[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop
3239 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi
3240 const char nop9
[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi
3241 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi
3243 const char nop10
[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi
3244 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi
3246 const char nop11
[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi
3247 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi
3249 const char nop12
[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
3250 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi
3251 0x00, 0x00, 0x00, 0x00 };
3252 const char nop13
[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
3253 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi
3254 0x27, 0x00, 0x00, 0x00,
3256 const char nop14
[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
3257 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi
3258 0xbc, 0x27, 0x00, 0x00,
3260 const char nop15
[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15
3261 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,...
3262 0x90, 0x90, 0x90, 0x90,
3265 const char* nops
[16] = {
3267 nop1
, nop2
, nop3
, nop4
, nop5
, nop6
, nop7
,
3268 nop8
, nop9
, nop10
, nop11
, nop12
, nop13
, nop14
, nop15
3271 return std::string(nops
[length
], length
);
3274 // Return the value to use for the base of a DW_EH_PE_datarel offset
3275 // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their
3276 // assembler can not write out the difference between two labels in
3277 // different sections, so instead of using a pc-relative value they
3278 // use an offset from the GOT.
3281 Target_i386::do_ehframe_datarel_base() const
3283 gold_assert(this->global_offset_table_
!= NULL
);
3284 Symbol
* sym
= this->global_offset_table_
;
3285 Sized_symbol
<32>* ssym
= static_cast<Sized_symbol
<32>*>(sym
);
3286 return ssym
->value();
3289 // Return whether SYM should be treated as a call to a non-split
3290 // function. We don't want that to be true of a call to a
3291 // get_pc_thunk function.
3294 Target_i386::do_is_call_to_non_split(const Symbol
* sym
, unsigned int) const
3296 return (sym
->type() == elfcpp::STT_FUNC
3297 && !is_prefix_of("__i686.get_pc_thunk.", sym
->name()));
3300 // FNOFFSET in section SHNDX in OBJECT is the start of a function
3301 // compiled with -fsplit-stack. The function calls non-split-stack
3302 // code. We have to change the function so that it always ensures
3303 // that it has enough stack space to run some random function.
3306 Target_i386::do_calls_non_split(Relobj
* object
, unsigned int shndx
,
3307 section_offset_type fnoffset
,
3308 section_size_type fnsize
,
3309 unsigned char* view
,
3310 section_size_type view_size
,
3312 std::string
* to
) const
3314 // The function starts with a comparison of the stack pointer and a
3315 // field in the TCB. This is followed by a jump.
3318 if (this->match_view(view
, view_size
, fnoffset
, "\x65\x3b\x25", 3)
3321 // We will call __morestack if the carry flag is set after this
3322 // comparison. We turn the comparison into an stc instruction
3324 view
[fnoffset
] = '\xf9';
3325 this->set_view_to_nop(view
, view_size
, fnoffset
+ 1, 6);
3327 // lea NN(%esp),%ecx
3328 // lea NN(%esp),%edx
3329 else if ((this->match_view(view
, view_size
, fnoffset
, "\x8d\x8c\x24", 3)
3330 || this->match_view(view
, view_size
, fnoffset
, "\x8d\x94\x24", 3))
3333 // This is loading an offset from the stack pointer for a
3334 // comparison. The offset is negative, so we decrease the
3335 // offset by the amount of space we need for the stack. This
3336 // means we will avoid calling __morestack if there happens to
3337 // be plenty of space on the stack already.
3338 unsigned char* pval
= view
+ fnoffset
+ 3;
3339 uint32_t val
= elfcpp::Swap_unaligned
<32, false>::readval(pval
);
3340 val
-= parameters
->options().split_stack_adjust_size();
3341 elfcpp::Swap_unaligned
<32, false>::writeval(pval
, val
);
3345 if (!object
->has_no_split_stack())
3346 object
->error(_("failed to match split-stack sequence at "
3347 "section %u offset %0zx"),
3348 shndx
, static_cast<size_t>(fnoffset
));
3352 // We have to change the function so that it calls
3353 // __morestack_non_split instead of __morestack. The former will
3354 // allocate additional stack space.
3355 *from
= "__morestack";
3356 *to
= "__morestack_non_split";
3359 // The selector for i386 object files.
3361 class Target_selector_i386
: public Target_selector_freebsd
3364 Target_selector_i386()
3365 : Target_selector_freebsd(elfcpp::EM_386
, 32, false,
3366 "elf32-i386", "elf32-i386-freebsd",
3371 do_instantiate_target()
3372 { return new Target_i386(); }
3375 Target_selector_i386 target_selector_i386
;
3377 } // End anonymous namespace.