1 // i386.cc -- i386 target support for gold.
3 // Copyright 2006, 2007, 2008, 2009 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.
28 #include "parameters.h"
35 #include "copy-relocs.h"
37 #include "target-reloc.h"
38 #include "target-select.h"
48 class Output_data_plt_i386
;
50 // The i386 target class.
51 // TLS info comes from
52 // http://people.redhat.com/drepper/tls.pdf
53 // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
55 class Target_i386
: public Target_freebsd
<32, false>
58 typedef Output_data_reloc
<elfcpp::SHT_REL
, true, 32, false> Reloc_section
;
61 : Target_freebsd
<32, false>(&i386_info
),
62 got_(NULL
), plt_(NULL
), got_plt_(NULL
), rel_dyn_(NULL
),
63 copy_relocs_(elfcpp::R_386_COPY
), dynbss_(NULL
),
64 got_mod_index_offset_(-1U), tls_base_symbol_defined_(false)
67 // Process the relocations to determine unreferenced sections for
68 // garbage collection.
70 gc_process_relocs(Symbol_table
* symtab
,
72 Sized_relobj
<32, false>* object
,
73 unsigned int data_shndx
,
75 const unsigned char* prelocs
,
77 Output_section
* output_section
,
78 bool needs_special_offset_handling
,
79 size_t local_symbol_count
,
80 const unsigned char* plocal_symbols
);
82 // Scan the relocations to look for symbol adjustments.
84 scan_relocs(Symbol_table
* symtab
,
86 Sized_relobj
<32, false>* object
,
87 unsigned int data_shndx
,
89 const unsigned char* prelocs
,
91 Output_section
* output_section
,
92 bool needs_special_offset_handling
,
93 size_t local_symbol_count
,
94 const unsigned char* plocal_symbols
);
96 // Finalize the sections.
98 do_finalize_sections(Layout
*, const Input_objects
*, Symbol_table
*);
100 // Return the value to use for a dynamic which requires special
103 do_dynsym_value(const Symbol
*) const;
105 // Relocate a section.
107 relocate_section(const Relocate_info
<32, false>*,
108 unsigned int sh_type
,
109 const unsigned char* prelocs
,
111 Output_section
* output_section
,
112 bool needs_special_offset_handling
,
114 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
115 section_size_type view_size
,
116 const Reloc_symbol_changes
*);
118 // Scan the relocs during a relocatable link.
120 scan_relocatable_relocs(Symbol_table
* symtab
,
122 Sized_relobj
<32, false>* object
,
123 unsigned int data_shndx
,
124 unsigned int sh_type
,
125 const unsigned char* prelocs
,
127 Output_section
* output_section
,
128 bool needs_special_offset_handling
,
129 size_t local_symbol_count
,
130 const unsigned char* plocal_symbols
,
131 Relocatable_relocs
*);
133 // Relocate a section during a relocatable link.
135 relocate_for_relocatable(const Relocate_info
<32, false>*,
136 unsigned int sh_type
,
137 const unsigned char* prelocs
,
139 Output_section
* output_section
,
140 off_t offset_in_output_section
,
141 const Relocatable_relocs
*,
143 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
144 section_size_type view_size
,
145 unsigned char* reloc_view
,
146 section_size_type reloc_view_size
);
148 // Return a string used to fill a code section with nops.
150 do_code_fill(section_size_type length
) const;
152 // Return whether SYM is defined by the ABI.
154 do_is_defined_by_abi(const Symbol
* sym
) const
155 { return strcmp(sym
->name(), "___tls_get_addr") == 0; }
157 // Return whether a symbol name implies a local label. The UnixWare
158 // 2.1 cc generates temporary symbols that start with .X, so we
159 // recognize them here. FIXME: do other SVR4 compilers also use .X?.
160 // If so, we should move the .X recognition into
161 // Target::do_is_local_label_name.
163 do_is_local_label_name(const char* name
) const
165 if (name
[0] == '.' && name
[1] == 'X')
167 return Target::do_is_local_label_name(name
);
170 // Adjust -fstack-split code which calls non-stack-split code.
172 do_calls_non_split(Relobj
* object
, unsigned int shndx
,
173 section_offset_type fnoffset
, section_size_type fnsize
,
174 unsigned char* view
, section_size_type view_size
,
175 std::string
* from
, std::string
* to
) const;
177 // Return the size of the GOT section.
181 gold_assert(this->got_
!= NULL
);
182 return this->got_
->data_size();
186 // The class which scans relocations.
190 local(Symbol_table
* symtab
, Layout
* layout
, Target_i386
* target
,
191 Sized_relobj
<32, false>* object
,
192 unsigned int data_shndx
,
193 Output_section
* output_section
,
194 const elfcpp::Rel
<32, false>& reloc
, unsigned int r_type
,
195 const elfcpp::Sym
<32, false>& lsym
);
198 global(Symbol_table
* symtab
, Layout
* layout
, Target_i386
* target
,
199 Sized_relobj
<32, false>* object
,
200 unsigned int data_shndx
,
201 Output_section
* output_section
,
202 const elfcpp::Rel
<32, false>& reloc
, unsigned int r_type
,
206 unsupported_reloc_local(Sized_relobj
<32, false>*, unsigned int r_type
);
209 unsupported_reloc_global(Sized_relobj
<32, false>*, unsigned int r_type
,
213 // The class which implements relocation.
218 : skip_call_tls_get_addr_(false),
219 local_dynamic_type_(LOCAL_DYNAMIC_NONE
)
224 if (this->skip_call_tls_get_addr_
)
226 // FIXME: This needs to specify the location somehow.
227 gold_error(_("missing expected TLS relocation"));
231 // Return whether the static relocation needs to be applied.
233 should_apply_static_reloc(const Sized_symbol
<32>* gsym
,
236 Output_section
* output_section
);
238 // Do a relocation. Return false if the caller should not issue
239 // any warnings about this relocation.
241 relocate(const Relocate_info
<32, false>*, Target_i386
*, Output_section
*,
242 size_t relnum
, const elfcpp::Rel
<32, false>&,
243 unsigned int r_type
, const Sized_symbol
<32>*,
244 const Symbol_value
<32>*,
245 unsigned char*, elfcpp::Elf_types
<32>::Elf_Addr
,
249 // Do a TLS relocation.
251 relocate_tls(const Relocate_info
<32, false>*, Target_i386
* target
,
252 size_t relnum
, const elfcpp::Rel
<32, false>&,
253 unsigned int r_type
, const Sized_symbol
<32>*,
254 const Symbol_value
<32>*,
255 unsigned char*, elfcpp::Elf_types
<32>::Elf_Addr
,
258 // Do a TLS General-Dynamic to Initial-Exec transition.
260 tls_gd_to_ie(const Relocate_info
<32, false>*, size_t relnum
,
261 Output_segment
* tls_segment
,
262 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
263 elfcpp::Elf_types
<32>::Elf_Addr value
,
265 section_size_type view_size
);
267 // Do a TLS General-Dynamic to Local-Exec transition.
269 tls_gd_to_le(const Relocate_info
<32, false>*, size_t relnum
,
270 Output_segment
* tls_segment
,
271 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
272 elfcpp::Elf_types
<32>::Elf_Addr value
,
274 section_size_type view_size
);
276 // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec
279 tls_desc_gd_to_ie(const Relocate_info
<32, false>*, size_t relnum
,
280 Output_segment
* tls_segment
,
281 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
282 elfcpp::Elf_types
<32>::Elf_Addr value
,
284 section_size_type view_size
);
286 // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec
289 tls_desc_gd_to_le(const Relocate_info
<32, false>*, size_t relnum
,
290 Output_segment
* tls_segment
,
291 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
292 elfcpp::Elf_types
<32>::Elf_Addr value
,
294 section_size_type view_size
);
296 // Do a TLS Local-Dynamic to Local-Exec transition.
298 tls_ld_to_le(const Relocate_info
<32, false>*, size_t relnum
,
299 Output_segment
* tls_segment
,
300 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
301 elfcpp::Elf_types
<32>::Elf_Addr value
,
303 section_size_type view_size
);
305 // Do a TLS Initial-Exec to Local-Exec transition.
307 tls_ie_to_le(const Relocate_info
<32, false>*, size_t relnum
,
308 Output_segment
* tls_segment
,
309 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
310 elfcpp::Elf_types
<32>::Elf_Addr value
,
312 section_size_type view_size
);
314 // We need to keep track of which type of local dynamic relocation
315 // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly.
316 enum Local_dynamic_type
323 // This is set if we should skip the next reloc, which should be a
324 // PLT32 reloc against ___tls_get_addr.
325 bool skip_call_tls_get_addr_
;
326 // The type of local dynamic relocation we have seen in the section
327 // being relocated, if any.
328 Local_dynamic_type local_dynamic_type_
;
331 // A class which returns the size required for a relocation type,
332 // used while scanning relocs during a relocatable link.
333 class Relocatable_size_for_reloc
337 get_size_for_reloc(unsigned int, Relobj
*);
340 // Adjust TLS relocation type based on the options and whether this
341 // is a local symbol.
342 static tls::Tls_optimization
343 optimize_tls_reloc(bool is_final
, int r_type
);
345 // Get the GOT section, creating it if necessary.
346 Output_data_got
<32, false>*
347 got_section(Symbol_table
*, Layout
*);
349 // Get the GOT PLT section.
351 got_plt_section() const
353 gold_assert(this->got_plt_
!= NULL
);
354 return this->got_plt_
;
357 // Create a PLT entry for a global symbol.
359 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
361 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
363 define_tls_base_symbol(Symbol_table
*, Layout
*);
365 // Create a GOT entry for the TLS module index.
367 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
368 Sized_relobj
<32, false>* object
);
370 // Get the PLT section.
371 const Output_data_plt_i386
*
374 gold_assert(this->plt_
!= NULL
);
378 // Get the dynamic reloc section, creating it if necessary.
380 rel_dyn_section(Layout
*);
382 // Add a potential copy relocation.
384 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
385 Sized_relobj
<32, false>* object
,
386 unsigned int shndx
, Output_section
* output_section
,
387 Symbol
* sym
, const elfcpp::Rel
<32, false>& reloc
)
389 this->copy_relocs_
.copy_reloc(symtab
, layout
,
390 symtab
->get_sized_symbol
<32>(sym
),
391 object
, shndx
, output_section
, reloc
,
392 this->rel_dyn_section(layout
));
395 // Information about this specific target which we pass to the
396 // general Target structure.
397 static const Target::Target_info i386_info
;
399 // The types of GOT entries needed for this platform.
402 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
403 GOT_TYPE_TLS_NOFFSET
= 1, // GOT entry for negative TLS offset
404 GOT_TYPE_TLS_OFFSET
= 2, // GOT entry for positive TLS offset
405 GOT_TYPE_TLS_PAIR
= 3, // GOT entry for TLS module/offset pair
406 GOT_TYPE_TLS_DESC
= 4 // GOT entry for TLS_DESC pair
410 Output_data_got
<32, false>* got_
;
412 Output_data_plt_i386
* plt_
;
413 // The GOT PLT section.
414 Output_data_space
* got_plt_
;
415 // The dynamic reloc section.
416 Reloc_section
* rel_dyn_
;
417 // Relocs saved to avoid a COPY reloc.
418 Copy_relocs
<elfcpp::SHT_REL
, 32, false> copy_relocs_
;
419 // Space for variables copied with a COPY reloc.
420 Output_data_space
* dynbss_
;
421 // Offset of the GOT entry for the TLS module index.
422 unsigned int got_mod_index_offset_
;
423 // True if the _TLS_MODULE_BASE_ symbol has been defined.
424 bool tls_base_symbol_defined_
;
427 const Target::Target_info
Target_i386::i386_info
=
430 false, // is_big_endian
431 elfcpp::EM_386
, // machine_code
432 false, // has_make_symbol
433 false, // has_resolve
434 true, // has_code_fill
435 true, // is_default_stack_executable
437 "/usr/lib/libc.so.1", // dynamic_linker
438 0x08048000, // default_text_segment_address
439 0x1000, // abi_pagesize (overridable by -z max-page-size)
440 0x1000, // common_pagesize (overridable by -z common-page-size)
441 elfcpp::SHN_UNDEF
, // small_common_shndx
442 elfcpp::SHN_UNDEF
, // large_common_shndx
443 0, // small_common_section_flags
444 0, // large_common_section_flags
445 NULL
, // attributes_section
446 NULL
// attributes_vendor
449 // Get the GOT section, creating it if necessary.
451 Output_data_got
<32, false>*
452 Target_i386::got_section(Symbol_table
* symtab
, Layout
* layout
)
454 if (this->got_
== NULL
)
456 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
458 this->got_
= new Output_data_got
<32, false>();
461 os
= layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
463 | elfcpp::SHF_WRITE
),
464 this->got_
, false, true, true,
467 this->got_plt_
= new Output_data_space(4, "** GOT PLT");
468 os
= layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
470 | elfcpp::SHF_WRITE
),
471 this->got_plt_
, false, false, false,
474 // The first three entries are reserved.
475 this->got_plt_
->set_current_data_size(3 * 4);
477 // Those bytes can go into the relro segment.
478 layout
->increase_relro(3 * 4);
480 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
481 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
482 Symbol_table::PREDEFINED
,
484 0, 0, elfcpp::STT_OBJECT
,
486 elfcpp::STV_HIDDEN
, 0,
493 // Get the dynamic reloc section, creating it if necessary.
495 Target_i386::Reloc_section
*
496 Target_i386::rel_dyn_section(Layout
* layout
)
498 if (this->rel_dyn_
== NULL
)
500 gold_assert(layout
!= NULL
);
501 this->rel_dyn_
= new Reloc_section(parameters
->options().combreloc());
502 layout
->add_output_section_data(".rel.dyn", elfcpp::SHT_REL
,
503 elfcpp::SHF_ALLOC
, this->rel_dyn_
, true,
504 false, false, false);
506 return this->rel_dyn_
;
509 // A class to handle the PLT data.
511 class Output_data_plt_i386
: public Output_section_data
514 typedef Output_data_reloc
<elfcpp::SHT_REL
, true, 32, false> Reloc_section
;
516 Output_data_plt_i386(Layout
*, Output_data_space
*);
518 // Add an entry to the PLT.
520 add_entry(Symbol
* gsym
);
522 // Return the .rel.plt section data.
525 { return this->rel_
; }
529 do_adjust_output_section(Output_section
* os
);
531 // Write to a map file.
533 do_print_to_mapfile(Mapfile
* mapfile
) const
534 { mapfile
->print_output_data(this, _("** PLT")); }
537 // The size of an entry in the PLT.
538 static const int plt_entry_size
= 16;
540 // The first entry in the PLT for an executable.
541 static unsigned char exec_first_plt_entry
[plt_entry_size
];
543 // The first entry in the PLT for a shared object.
544 static unsigned char dyn_first_plt_entry
[plt_entry_size
];
546 // Other entries in the PLT for an executable.
547 static unsigned char exec_plt_entry
[plt_entry_size
];
549 // Other entries in the PLT for a shared object.
550 static unsigned char dyn_plt_entry
[plt_entry_size
];
552 // Set the final size.
554 set_final_data_size()
555 { this->set_data_size((this->count_
+ 1) * plt_entry_size
); }
557 // Write out the PLT data.
559 do_write(Output_file
*);
561 // The reloc section.
563 // The .got.plt section.
564 Output_data_space
* got_plt_
;
565 // The number of PLT entries.
569 // Create the PLT section. The ordinary .got section is an argument,
570 // since we need to refer to the start. We also create our own .got
571 // section just for PLT entries.
573 Output_data_plt_i386::Output_data_plt_i386(Layout
* layout
,
574 Output_data_space
* got_plt
)
575 : Output_section_data(4), got_plt_(got_plt
), count_(0)
577 this->rel_
= new Reloc_section(false);
578 layout
->add_output_section_data(".rel.plt", elfcpp::SHT_REL
,
579 elfcpp::SHF_ALLOC
, this->rel_
, true,
580 false, false, false);
584 Output_data_plt_i386::do_adjust_output_section(Output_section
* os
)
586 // UnixWare sets the entsize of .plt to 4, and so does the old GNU
587 // linker, and so do we.
591 // Add an entry to the PLT.
594 Output_data_plt_i386::add_entry(Symbol
* gsym
)
596 gold_assert(!gsym
->has_plt_offset());
598 // Note that when setting the PLT offset we skip the initial
599 // reserved PLT entry.
600 gsym
->set_plt_offset((this->count_
+ 1) * plt_entry_size
);
604 section_offset_type got_offset
= this->got_plt_
->current_data_size();
606 // Every PLT entry needs a GOT entry which points back to the PLT
607 // entry (this will be changed by the dynamic linker, normally
608 // lazily when the function is called).
609 this->got_plt_
->set_current_data_size(got_offset
+ 4);
611 // Every PLT entry needs a reloc.
612 gsym
->set_needs_dynsym_entry();
613 this->rel_
->add_global(gsym
, elfcpp::R_386_JUMP_SLOT
, this->got_plt_
,
616 // Note that we don't need to save the symbol. The contents of the
617 // PLT are independent of which symbols are used. The symbols only
618 // appear in the relocations.
621 // The first entry in the PLT for an executable.
623 unsigned char Output_data_plt_i386::exec_first_plt_entry
[plt_entry_size
] =
625 0xff, 0x35, // pushl contents of memory address
626 0, 0, 0, 0, // replaced with address of .got + 4
627 0xff, 0x25, // jmp indirect
628 0, 0, 0, 0, // replaced with address of .got + 8
632 // The first entry in the PLT for a shared object.
634 unsigned char Output_data_plt_i386::dyn_first_plt_entry
[plt_entry_size
] =
636 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx)
637 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx)
641 // Subsequent entries in the PLT for an executable.
643 unsigned char Output_data_plt_i386::exec_plt_entry
[plt_entry_size
] =
645 0xff, 0x25, // jmp indirect
646 0, 0, 0, 0, // replaced with address of symbol in .got
647 0x68, // pushl immediate
648 0, 0, 0, 0, // replaced with offset into relocation table
649 0xe9, // jmp relative
650 0, 0, 0, 0 // replaced with offset to start of .plt
653 // Subsequent entries in the PLT for a shared object.
655 unsigned char Output_data_plt_i386::dyn_plt_entry
[plt_entry_size
] =
657 0xff, 0xa3, // jmp *offset(%ebx)
658 0, 0, 0, 0, // replaced with offset of symbol in .got
659 0x68, // pushl immediate
660 0, 0, 0, 0, // replaced with offset into relocation table
661 0xe9, // jmp relative
662 0, 0, 0, 0 // replaced with offset to start of .plt
665 // Write out the PLT. This uses the hand-coded instructions above,
666 // and adjusts them as needed. This is all specified by the i386 ELF
667 // Processor Supplement.
670 Output_data_plt_i386::do_write(Output_file
* of
)
672 const off_t offset
= this->offset();
673 const section_size_type oview_size
=
674 convert_to_section_size_type(this->data_size());
675 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
677 const off_t got_file_offset
= this->got_plt_
->offset();
678 const section_size_type got_size
=
679 convert_to_section_size_type(this->got_plt_
->data_size());
680 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
683 unsigned char* pov
= oview
;
685 elfcpp::Elf_types
<32>::Elf_Addr plt_address
= this->address();
686 elfcpp::Elf_types
<32>::Elf_Addr got_address
= this->got_plt_
->address();
688 if (parameters
->options().output_is_position_independent())
689 memcpy(pov
, dyn_first_plt_entry
, plt_entry_size
);
692 memcpy(pov
, exec_first_plt_entry
, plt_entry_size
);
693 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2, got_address
+ 4);
694 elfcpp::Swap
<32, false>::writeval(pov
+ 8, got_address
+ 8);
696 pov
+= plt_entry_size
;
698 unsigned char* got_pov
= got_view
;
700 memset(got_pov
, 0, 12);
703 const int rel_size
= elfcpp::Elf_sizes
<32>::rel_size
;
705 unsigned int plt_offset
= plt_entry_size
;
706 unsigned int plt_rel_offset
= 0;
707 unsigned int got_offset
= 12;
708 const unsigned int count
= this->count_
;
709 for (unsigned int i
= 0;
712 pov
+= plt_entry_size
,
714 plt_offset
+= plt_entry_size
,
715 plt_rel_offset
+= rel_size
,
718 // Set and adjust the PLT entry itself.
720 if (parameters
->options().output_is_position_independent())
722 memcpy(pov
, dyn_plt_entry
, plt_entry_size
);
723 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2, got_offset
);
727 memcpy(pov
, exec_plt_entry
, plt_entry_size
);
728 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
733 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 7, plt_rel_offset
);
734 elfcpp::Swap
<32, false>::writeval(pov
+ 12,
735 - (plt_offset
+ plt_entry_size
));
737 // Set the entry in the GOT.
738 elfcpp::Swap
<32, false>::writeval(got_pov
, plt_address
+ plt_offset
+ 6);
741 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
742 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
744 of
->write_output_view(offset
, oview_size
, oview
);
745 of
->write_output_view(got_file_offset
, got_size
, got_view
);
748 // Create a PLT entry for a global symbol.
751 Target_i386::make_plt_entry(Symbol_table
* symtab
, Layout
* layout
, Symbol
* gsym
)
753 if (gsym
->has_plt_offset())
756 if (this->plt_
== NULL
)
758 // Create the GOT sections first.
759 this->got_section(symtab
, layout
);
761 this->plt_
= new Output_data_plt_i386(layout
, this->got_plt_
);
762 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
764 | elfcpp::SHF_EXECINSTR
),
765 this->plt_
, false, false, false, false);
768 this->plt_
->add_entry(gsym
);
771 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
774 Target_i386::define_tls_base_symbol(Symbol_table
* symtab
, Layout
* layout
)
776 if (this->tls_base_symbol_defined_
)
779 Output_segment
* tls_segment
= layout
->tls_segment();
780 if (tls_segment
!= NULL
)
782 bool is_exec
= parameters
->options().output_is_executable();
783 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
784 Symbol_table::PREDEFINED
,
788 elfcpp::STV_HIDDEN
, 0,
790 ? Symbol::SEGMENT_END
791 : Symbol::SEGMENT_START
),
794 this->tls_base_symbol_defined_
= true;
797 // Create a GOT entry for the TLS module index.
800 Target_i386::got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
801 Sized_relobj
<32, false>* object
)
803 if (this->got_mod_index_offset_
== -1U)
805 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
806 Reloc_section
* rel_dyn
= this->rel_dyn_section(layout
);
807 Output_data_got
<32, false>* got
= this->got_section(symtab
, layout
);
808 unsigned int got_offset
= got
->add_constant(0);
809 rel_dyn
->add_local(object
, 0, elfcpp::R_386_TLS_DTPMOD32
, got
,
811 got
->add_constant(0);
812 this->got_mod_index_offset_
= got_offset
;
814 return this->got_mod_index_offset_
;
817 // Optimize the TLS relocation type based on what we know about the
818 // symbol. IS_FINAL is true if the final address of this symbol is
819 // known at link time.
821 tls::Tls_optimization
822 Target_i386::optimize_tls_reloc(bool is_final
, int r_type
)
824 // If we are generating a shared library, then we can't do anything
826 if (parameters
->options().shared())
827 return tls::TLSOPT_NONE
;
831 case elfcpp::R_386_TLS_GD
:
832 case elfcpp::R_386_TLS_GOTDESC
:
833 case elfcpp::R_386_TLS_DESC_CALL
:
834 // These are General-Dynamic which permits fully general TLS
835 // access. Since we know that we are generating an executable,
836 // we can convert this to Initial-Exec. If we also know that
837 // this is a local symbol, we can further switch to Local-Exec.
839 return tls::TLSOPT_TO_LE
;
840 return tls::TLSOPT_TO_IE
;
842 case elfcpp::R_386_TLS_LDM
:
843 // This is Local-Dynamic, which refers to a local symbol in the
844 // dynamic TLS block. Since we know that we generating an
845 // executable, we can switch to Local-Exec.
846 return tls::TLSOPT_TO_LE
;
848 case elfcpp::R_386_TLS_LDO_32
:
849 // Another type of Local-Dynamic relocation.
850 return tls::TLSOPT_TO_LE
;
852 case elfcpp::R_386_TLS_IE
:
853 case elfcpp::R_386_TLS_GOTIE
:
854 case elfcpp::R_386_TLS_IE_32
:
855 // These are Initial-Exec relocs which get the thread offset
856 // from the GOT. If we know that we are linking against the
857 // local symbol, we can switch to Local-Exec, which links the
858 // thread offset into the instruction.
860 return tls::TLSOPT_TO_LE
;
861 return tls::TLSOPT_NONE
;
863 case elfcpp::R_386_TLS_LE
:
864 case elfcpp::R_386_TLS_LE_32
:
865 // When we already have Local-Exec, there is nothing further we
867 return tls::TLSOPT_NONE
;
874 // Report an unsupported relocation against a local symbol.
877 Target_i386::Scan::unsupported_reloc_local(Sized_relobj
<32, false>* object
,
880 gold_error(_("%s: unsupported reloc %u against local symbol"),
881 object
->name().c_str(), r_type
);
884 // Scan a relocation for a local symbol.
887 Target_i386::Scan::local(Symbol_table
* symtab
,
890 Sized_relobj
<32, false>* object
,
891 unsigned int data_shndx
,
892 Output_section
* output_section
,
893 const elfcpp::Rel
<32, false>& reloc
,
895 const elfcpp::Sym
<32, false>& lsym
)
899 case elfcpp::R_386_NONE
:
900 case elfcpp::R_386_GNU_VTINHERIT
:
901 case elfcpp::R_386_GNU_VTENTRY
:
904 case elfcpp::R_386_32
:
905 // If building a shared library (or a position-independent
906 // executable), we need to create a dynamic relocation for
907 // this location. The relocation applied at link time will
908 // apply the link-time value, so we flag the location with
909 // an R_386_RELATIVE relocation so the dynamic loader can
910 // relocate it easily.
911 if (parameters
->options().output_is_position_independent())
913 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
914 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
915 rel_dyn
->add_local_relative(object
, r_sym
, elfcpp::R_386_RELATIVE
,
916 output_section
, data_shndx
,
917 reloc
.get_r_offset());
921 case elfcpp::R_386_16
:
922 case elfcpp::R_386_8
:
923 // If building a shared library (or a position-independent
924 // executable), we need to create a dynamic relocation for
925 // this location. Because the addend needs to remain in the
926 // data section, we need to be careful not to apply this
927 // relocation statically.
928 if (parameters
->options().output_is_position_independent())
930 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
931 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
932 if (lsym
.get_st_type() != elfcpp::STT_SECTION
)
933 rel_dyn
->add_local(object
, r_sym
, r_type
, output_section
,
934 data_shndx
, reloc
.get_r_offset());
937 gold_assert(lsym
.get_st_value() == 0);
938 unsigned int shndx
= lsym
.get_st_shndx();
940 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
,
943 object
->error(_("section symbol %u has bad shndx %u"),
946 rel_dyn
->add_local_section(object
, shndx
,
947 r_type
, output_section
,
948 data_shndx
, reloc
.get_r_offset());
953 case elfcpp::R_386_PC32
:
954 case elfcpp::R_386_PC16
:
955 case elfcpp::R_386_PC8
:
958 case elfcpp::R_386_PLT32
:
959 // Since we know this is a local symbol, we can handle this as a
963 case elfcpp::R_386_GOTOFF
:
964 case elfcpp::R_386_GOTPC
:
965 // We need a GOT section.
966 target
->got_section(symtab
, layout
);
969 case elfcpp::R_386_GOT32
:
971 // The symbol requires a GOT entry.
972 Output_data_got
<32, false>* got
= target
->got_section(symtab
, layout
);
973 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
974 if (got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
))
976 // If we are generating a shared object, we need to add a
977 // dynamic RELATIVE relocation for this symbol's GOT entry.
978 if (parameters
->options().output_is_position_independent())
980 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
981 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
982 rel_dyn
->add_local_relative(
983 object
, r_sym
, elfcpp::R_386_RELATIVE
, got
,
984 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
));
990 // These are relocations which should only be seen by the
991 // dynamic linker, and should never be seen here.
992 case elfcpp::R_386_COPY
:
993 case elfcpp::R_386_GLOB_DAT
:
994 case elfcpp::R_386_JUMP_SLOT
:
995 case elfcpp::R_386_RELATIVE
:
996 case elfcpp::R_386_TLS_TPOFF
:
997 case elfcpp::R_386_TLS_DTPMOD32
:
998 case elfcpp::R_386_TLS_DTPOFF32
:
999 case elfcpp::R_386_TLS_TPOFF32
:
1000 case elfcpp::R_386_TLS_DESC
:
1001 gold_error(_("%s: unexpected reloc %u in object file"),
1002 object
->name().c_str(), r_type
);
1005 // These are initial TLS relocs, which are expected when
1007 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1008 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
1009 case elfcpp::R_386_TLS_DESC_CALL
:
1010 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1011 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1012 case elfcpp::R_386_TLS_IE
: // Initial-exec
1013 case elfcpp::R_386_TLS_IE_32
:
1014 case elfcpp::R_386_TLS_GOTIE
:
1015 case elfcpp::R_386_TLS_LE
: // Local-exec
1016 case elfcpp::R_386_TLS_LE_32
:
1018 bool output_is_shared
= parameters
->options().shared();
1019 const tls::Tls_optimization optimized_type
1020 = Target_i386::optimize_tls_reloc(!output_is_shared
, r_type
);
1023 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1024 if (optimized_type
== tls::TLSOPT_NONE
)
1026 // Create a pair of GOT entries for the module index and
1027 // dtv-relative offset.
1028 Output_data_got
<32, false>* got
1029 = target
->got_section(symtab
, layout
);
1030 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1031 unsigned int shndx
= lsym
.get_st_shndx();
1033 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
1035 object
->error(_("local symbol %u has bad shndx %u"),
1038 got
->add_local_pair_with_rel(object
, r_sym
, shndx
,
1040 target
->rel_dyn_section(layout
),
1041 elfcpp::R_386_TLS_DTPMOD32
, 0);
1043 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1044 unsupported_reloc_local(object
, r_type
);
1047 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva)
1048 target
->define_tls_base_symbol(symtab
, layout
);
1049 if (optimized_type
== tls::TLSOPT_NONE
)
1051 // Create a double GOT entry with an R_386_TLS_DESC reloc.
1052 Output_data_got
<32, false>* got
1053 = target
->got_section(symtab
, layout
);
1054 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1055 unsigned int shndx
= lsym
.get_st_shndx();
1057 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
1059 object
->error(_("local symbol %u has bad shndx %u"),
1062 got
->add_local_pair_with_rel(object
, r_sym
, shndx
,
1064 target
->rel_dyn_section(layout
),
1065 elfcpp::R_386_TLS_DESC
, 0);
1067 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1068 unsupported_reloc_local(object
, r_type
);
1071 case elfcpp::R_386_TLS_DESC_CALL
:
1074 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1075 if (optimized_type
== tls::TLSOPT_NONE
)
1077 // Create a GOT entry for the module index.
1078 target
->got_mod_index_entry(symtab
, layout
, object
);
1080 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1081 unsupported_reloc_local(object
, r_type
);
1084 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1087 case elfcpp::R_386_TLS_IE
: // Initial-exec
1088 case elfcpp::R_386_TLS_IE_32
:
1089 case elfcpp::R_386_TLS_GOTIE
:
1090 layout
->set_has_static_tls();
1091 if (optimized_type
== tls::TLSOPT_NONE
)
1093 // For the R_386_TLS_IE relocation, we need to create a
1094 // dynamic relocation when building a shared library.
1095 if (r_type
== elfcpp::R_386_TLS_IE
1096 && parameters
->options().shared())
1098 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1100 = elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1101 rel_dyn
->add_local_relative(object
, r_sym
,
1102 elfcpp::R_386_RELATIVE
,
1103 output_section
, data_shndx
,
1104 reloc
.get_r_offset());
1106 // Create a GOT entry for the tp-relative offset.
1107 Output_data_got
<32, false>* got
1108 = target
->got_section(symtab
, layout
);
1109 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1110 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_IE_32
1111 ? elfcpp::R_386_TLS_TPOFF32
1112 : elfcpp::R_386_TLS_TPOFF
);
1113 unsigned int got_type
= (r_type
== elfcpp::R_386_TLS_IE_32
1114 ? GOT_TYPE_TLS_OFFSET
1115 : GOT_TYPE_TLS_NOFFSET
);
1116 got
->add_local_with_rel(object
, r_sym
, got_type
,
1117 target
->rel_dyn_section(layout
),
1120 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1121 unsupported_reloc_local(object
, r_type
);
1124 case elfcpp::R_386_TLS_LE
: // Local-exec
1125 case elfcpp::R_386_TLS_LE_32
:
1126 layout
->set_has_static_tls();
1127 if (output_is_shared
)
1129 // We need to create a dynamic relocation.
1130 gold_assert(lsym
.get_st_type() != elfcpp::STT_SECTION
);
1131 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1132 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_LE_32
1133 ? elfcpp::R_386_TLS_TPOFF32
1134 : elfcpp::R_386_TLS_TPOFF
);
1135 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1136 rel_dyn
->add_local(object
, r_sym
, dyn_r_type
, output_section
,
1137 data_shndx
, reloc
.get_r_offset());
1147 case elfcpp::R_386_32PLT
:
1148 case elfcpp::R_386_TLS_GD_32
:
1149 case elfcpp::R_386_TLS_GD_PUSH
:
1150 case elfcpp::R_386_TLS_GD_CALL
:
1151 case elfcpp::R_386_TLS_GD_POP
:
1152 case elfcpp::R_386_TLS_LDM_32
:
1153 case elfcpp::R_386_TLS_LDM_PUSH
:
1154 case elfcpp::R_386_TLS_LDM_CALL
:
1155 case elfcpp::R_386_TLS_LDM_POP
:
1156 case elfcpp::R_386_USED_BY_INTEL_200
:
1158 unsupported_reloc_local(object
, r_type
);
1163 // Report an unsupported relocation against a global symbol.
1166 Target_i386::Scan::unsupported_reloc_global(Sized_relobj
<32, false>* object
,
1167 unsigned int r_type
,
1170 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1171 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
1174 // Scan a relocation for a global symbol.
1177 Target_i386::Scan::global(Symbol_table
* symtab
,
1179 Target_i386
* target
,
1180 Sized_relobj
<32, false>* object
,
1181 unsigned int data_shndx
,
1182 Output_section
* output_section
,
1183 const elfcpp::Rel
<32, false>& reloc
,
1184 unsigned int r_type
,
1189 case elfcpp::R_386_NONE
:
1190 case elfcpp::R_386_GNU_VTINHERIT
:
1191 case elfcpp::R_386_GNU_VTENTRY
:
1194 case elfcpp::R_386_32
:
1195 case elfcpp::R_386_16
:
1196 case elfcpp::R_386_8
:
1198 // Make a PLT entry if necessary.
1199 if (gsym
->needs_plt_entry())
1201 target
->make_plt_entry(symtab
, layout
, gsym
);
1202 // Since this is not a PC-relative relocation, we may be
1203 // taking the address of a function. In that case we need to
1204 // set the entry in the dynamic symbol table to the address of
1206 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
1207 gsym
->set_needs_dynsym_value();
1209 // Make a dynamic relocation if necessary.
1210 if (gsym
->needs_dynamic_reloc(Symbol::ABSOLUTE_REF
))
1212 if (gsym
->may_need_copy_reloc())
1214 target
->copy_reloc(symtab
, layout
, object
,
1215 data_shndx
, output_section
, gsym
, reloc
);
1217 else if (r_type
== elfcpp::R_386_32
1218 && gsym
->can_use_relative_reloc(false))
1220 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1221 rel_dyn
->add_global_relative(gsym
, elfcpp::R_386_RELATIVE
,
1222 output_section
, object
,
1223 data_shndx
, reloc
.get_r_offset());
1227 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1228 rel_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1229 data_shndx
, reloc
.get_r_offset());
1235 case elfcpp::R_386_PC32
:
1236 case elfcpp::R_386_PC16
:
1237 case elfcpp::R_386_PC8
:
1239 // Make a PLT entry if necessary.
1240 if (gsym
->needs_plt_entry())
1242 // These relocations are used for function calls only in
1243 // non-PIC code. For a 32-bit relocation in a shared library,
1244 // we'll need a text relocation anyway, so we can skip the
1245 // PLT entry and let the dynamic linker bind the call directly
1246 // to the target. For smaller relocations, we should use a
1247 // PLT entry to ensure that the call can reach.
1248 if (!parameters
->options().shared()
1249 || r_type
!= elfcpp::R_386_PC32
)
1250 target
->make_plt_entry(symtab
, layout
, gsym
);
1252 // Make a dynamic relocation if necessary.
1253 int flags
= Symbol::NON_PIC_REF
;
1254 if (gsym
->is_func())
1255 flags
|= Symbol::FUNCTION_CALL
;
1256 if (gsym
->needs_dynamic_reloc(flags
))
1258 if (gsym
->may_need_copy_reloc())
1260 target
->copy_reloc(symtab
, layout
, object
,
1261 data_shndx
, output_section
, gsym
, reloc
);
1265 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1266 rel_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1267 data_shndx
, reloc
.get_r_offset());
1273 case elfcpp::R_386_GOT32
:
1275 // The symbol requires a GOT entry.
1276 Output_data_got
<32, false>* got
= target
->got_section(symtab
, layout
);
1277 if (gsym
->final_value_is_known())
1278 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
1281 // If this symbol is not fully resolved, we need to add a
1282 // GOT entry with a dynamic relocation.
1283 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1284 if (gsym
->is_from_dynobj()
1285 || gsym
->is_undefined()
1286 || gsym
->is_preemptible())
1287 got
->add_global_with_rel(gsym
, GOT_TYPE_STANDARD
,
1288 rel_dyn
, elfcpp::R_386_GLOB_DAT
);
1291 if (got
->add_global(gsym
, GOT_TYPE_STANDARD
))
1292 rel_dyn
->add_global_relative(
1293 gsym
, elfcpp::R_386_RELATIVE
, got
,
1294 gsym
->got_offset(GOT_TYPE_STANDARD
));
1300 case elfcpp::R_386_PLT32
:
1301 // If the symbol is fully resolved, this is just a PC32 reloc.
1302 // Otherwise we need a PLT entry.
1303 if (gsym
->final_value_is_known())
1305 // If building a shared library, we can also skip the PLT entry
1306 // if the symbol is defined in the output file and is protected
1308 if (gsym
->is_defined()
1309 && !gsym
->is_from_dynobj()
1310 && !gsym
->is_preemptible())
1312 target
->make_plt_entry(symtab
, layout
, gsym
);
1315 case elfcpp::R_386_GOTOFF
:
1316 case elfcpp::R_386_GOTPC
:
1317 // We need a GOT section.
1318 target
->got_section(symtab
, layout
);
1321 // These are relocations which should only be seen by the
1322 // dynamic linker, and should never be seen here.
1323 case elfcpp::R_386_COPY
:
1324 case elfcpp::R_386_GLOB_DAT
:
1325 case elfcpp::R_386_JUMP_SLOT
:
1326 case elfcpp::R_386_RELATIVE
:
1327 case elfcpp::R_386_TLS_TPOFF
:
1328 case elfcpp::R_386_TLS_DTPMOD32
:
1329 case elfcpp::R_386_TLS_DTPOFF32
:
1330 case elfcpp::R_386_TLS_TPOFF32
:
1331 case elfcpp::R_386_TLS_DESC
:
1332 gold_error(_("%s: unexpected reloc %u in object file"),
1333 object
->name().c_str(), r_type
);
1336 // These are initial tls relocs, which are expected when
1338 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1339 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
1340 case elfcpp::R_386_TLS_DESC_CALL
:
1341 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1342 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1343 case elfcpp::R_386_TLS_IE
: // Initial-exec
1344 case elfcpp::R_386_TLS_IE_32
:
1345 case elfcpp::R_386_TLS_GOTIE
:
1346 case elfcpp::R_386_TLS_LE
: // Local-exec
1347 case elfcpp::R_386_TLS_LE_32
:
1349 const bool is_final
= gsym
->final_value_is_known();
1350 const tls::Tls_optimization optimized_type
1351 = Target_i386::optimize_tls_reloc(is_final
, r_type
);
1354 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1355 if (optimized_type
== tls::TLSOPT_NONE
)
1357 // Create a pair of GOT entries for the module index and
1358 // dtv-relative offset.
1359 Output_data_got
<32, false>* got
1360 = target
->got_section(symtab
, layout
);
1361 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_PAIR
,
1362 target
->rel_dyn_section(layout
),
1363 elfcpp::R_386_TLS_DTPMOD32
,
1364 elfcpp::R_386_TLS_DTPOFF32
);
1366 else if (optimized_type
== tls::TLSOPT_TO_IE
)
1368 // Create a GOT entry for the tp-relative offset.
1369 Output_data_got
<32, false>* got
1370 = target
->got_section(symtab
, layout
);
1371 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_NOFFSET
,
1372 target
->rel_dyn_section(layout
),
1373 elfcpp::R_386_TLS_TPOFF
);
1375 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1376 unsupported_reloc_global(object
, r_type
, gsym
);
1379 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (~oliva url)
1380 target
->define_tls_base_symbol(symtab
, layout
);
1381 if (optimized_type
== tls::TLSOPT_NONE
)
1383 // Create a double GOT entry with an R_386_TLS_DESC reloc.
1384 Output_data_got
<32, false>* got
1385 = target
->got_section(symtab
, layout
);
1386 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_DESC
,
1387 target
->rel_dyn_section(layout
),
1388 elfcpp::R_386_TLS_DESC
, 0);
1390 else if (optimized_type
== tls::TLSOPT_TO_IE
)
1392 // Create a GOT entry for the tp-relative offset.
1393 Output_data_got
<32, false>* got
1394 = target
->got_section(symtab
, layout
);
1395 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_NOFFSET
,
1396 target
->rel_dyn_section(layout
),
1397 elfcpp::R_386_TLS_TPOFF
);
1399 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1400 unsupported_reloc_global(object
, r_type
, gsym
);
1403 case elfcpp::R_386_TLS_DESC_CALL
:
1406 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1407 if (optimized_type
== tls::TLSOPT_NONE
)
1409 // Create a GOT entry for the module index.
1410 target
->got_mod_index_entry(symtab
, layout
, object
);
1412 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1413 unsupported_reloc_global(object
, r_type
, gsym
);
1416 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1419 case elfcpp::R_386_TLS_IE
: // Initial-exec
1420 case elfcpp::R_386_TLS_IE_32
:
1421 case elfcpp::R_386_TLS_GOTIE
:
1422 layout
->set_has_static_tls();
1423 if (optimized_type
== tls::TLSOPT_NONE
)
1425 // For the R_386_TLS_IE relocation, we need to create a
1426 // dynamic relocation when building a shared library.
1427 if (r_type
== elfcpp::R_386_TLS_IE
1428 && parameters
->options().shared())
1430 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1431 rel_dyn
->add_global_relative(gsym
, elfcpp::R_386_RELATIVE
,
1432 output_section
, object
,
1434 reloc
.get_r_offset());
1436 // Create a GOT entry for the tp-relative offset.
1437 Output_data_got
<32, false>* got
1438 = target
->got_section(symtab
, layout
);
1439 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_IE_32
1440 ? elfcpp::R_386_TLS_TPOFF32
1441 : elfcpp::R_386_TLS_TPOFF
);
1442 unsigned int got_type
= (r_type
== elfcpp::R_386_TLS_IE_32
1443 ? GOT_TYPE_TLS_OFFSET
1444 : GOT_TYPE_TLS_NOFFSET
);
1445 got
->add_global_with_rel(gsym
, got_type
,
1446 target
->rel_dyn_section(layout
),
1449 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1450 unsupported_reloc_global(object
, r_type
, gsym
);
1453 case elfcpp::R_386_TLS_LE
: // Local-exec
1454 case elfcpp::R_386_TLS_LE_32
:
1455 layout
->set_has_static_tls();
1456 if (parameters
->options().shared())
1458 // We need to create a dynamic relocation.
1459 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_LE_32
1460 ? elfcpp::R_386_TLS_TPOFF32
1461 : elfcpp::R_386_TLS_TPOFF
);
1462 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1463 rel_dyn
->add_global(gsym
, dyn_r_type
, output_section
, object
,
1464 data_shndx
, reloc
.get_r_offset());
1474 case elfcpp::R_386_32PLT
:
1475 case elfcpp::R_386_TLS_GD_32
:
1476 case elfcpp::R_386_TLS_GD_PUSH
:
1477 case elfcpp::R_386_TLS_GD_CALL
:
1478 case elfcpp::R_386_TLS_GD_POP
:
1479 case elfcpp::R_386_TLS_LDM_32
:
1480 case elfcpp::R_386_TLS_LDM_PUSH
:
1481 case elfcpp::R_386_TLS_LDM_CALL
:
1482 case elfcpp::R_386_TLS_LDM_POP
:
1483 case elfcpp::R_386_USED_BY_INTEL_200
:
1485 unsupported_reloc_global(object
, r_type
, gsym
);
1490 // Process relocations for gc.
1493 Target_i386::gc_process_relocs(Symbol_table
* symtab
,
1495 Sized_relobj
<32, false>* object
,
1496 unsigned int data_shndx
,
1498 const unsigned char* prelocs
,
1500 Output_section
* output_section
,
1501 bool needs_special_offset_handling
,
1502 size_t local_symbol_count
,
1503 const unsigned char* plocal_symbols
)
1505 gold::gc_process_relocs
<32, false, Target_i386
, elfcpp::SHT_REL
,
1515 needs_special_offset_handling
,
1520 // Scan relocations for a section.
1523 Target_i386::scan_relocs(Symbol_table
* symtab
,
1525 Sized_relobj
<32, false>* object
,
1526 unsigned int data_shndx
,
1527 unsigned int sh_type
,
1528 const unsigned char* prelocs
,
1530 Output_section
* output_section
,
1531 bool needs_special_offset_handling
,
1532 size_t local_symbol_count
,
1533 const unsigned char* plocal_symbols
)
1535 if (sh_type
== elfcpp::SHT_RELA
)
1537 gold_error(_("%s: unsupported RELA reloc section"),
1538 object
->name().c_str());
1542 gold::scan_relocs
<32, false, Target_i386
, elfcpp::SHT_REL
,
1552 needs_special_offset_handling
,
1557 // Finalize the sections.
1560 Target_i386::do_finalize_sections(
1562 const Input_objects
*,
1565 // Fill in some more dynamic tags.
1566 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
1569 if (this->got_plt_
!= NULL
1570 && this->got_plt_
->output_section() != NULL
)
1571 odyn
->add_section_address(elfcpp::DT_PLTGOT
, this->got_plt_
);
1573 if (this->plt_
!= NULL
1574 && this->plt_
->output_section() != NULL
)
1576 const Output_data
* od
= this->plt_
->rel_plt();
1577 odyn
->add_section_size(elfcpp::DT_PLTRELSZ
, od
);
1578 odyn
->add_section_address(elfcpp::DT_JMPREL
, od
);
1579 odyn
->add_constant(elfcpp::DT_PLTREL
, elfcpp::DT_REL
);
1582 if (this->rel_dyn_
!= NULL
1583 && this->rel_dyn_
->output_section() != NULL
)
1585 const Output_data
* od
= this->rel_dyn_
;
1586 odyn
->add_section_address(elfcpp::DT_REL
, od
);
1587 odyn
->add_section_size(elfcpp::DT_RELSZ
, od
);
1588 odyn
->add_constant(elfcpp::DT_RELENT
,
1589 elfcpp::Elf_sizes
<32>::rel_size
);
1592 if (!parameters
->options().shared())
1594 // The value of the DT_DEBUG tag is filled in by the dynamic
1595 // linker at run time, and used by the debugger.
1596 odyn
->add_constant(elfcpp::DT_DEBUG
, 0);
1600 // Emit any relocs we saved in an attempt to avoid generating COPY
1602 if (this->copy_relocs_
.any_saved_relocs())
1603 this->copy_relocs_
.emit(this->rel_dyn_section(layout
));
1606 // Return whether a direct absolute static relocation needs to be applied.
1607 // In cases where Scan::local() or Scan::global() has created
1608 // a dynamic relocation other than R_386_RELATIVE, the addend
1609 // of the relocation is carried in the data, and we must not
1610 // apply the static relocation.
1613 Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol
<32>* gsym
,
1616 Output_section
* output_section
)
1618 // If the output section is not allocated, then we didn't call
1619 // scan_relocs, we didn't create a dynamic reloc, and we must apply
1621 if ((output_section
->flags() & elfcpp::SHF_ALLOC
) == 0)
1624 // For local symbols, we will have created a non-RELATIVE dynamic
1625 // relocation only if (a) the output is position independent,
1626 // (b) the relocation is absolute (not pc- or segment-relative), and
1627 // (c) the relocation is not 32 bits wide.
1629 return !(parameters
->options().output_is_position_independent()
1630 && (ref_flags
& Symbol::ABSOLUTE_REF
)
1633 // For global symbols, we use the same helper routines used in the
1634 // scan pass. If we did not create a dynamic relocation, or if we
1635 // created a RELATIVE dynamic relocation, we should apply the static
1637 bool has_dyn
= gsym
->needs_dynamic_reloc(ref_flags
);
1638 bool is_rel
= (ref_flags
& Symbol::ABSOLUTE_REF
)
1639 && gsym
->can_use_relative_reloc(ref_flags
1640 & Symbol::FUNCTION_CALL
);
1641 return !has_dyn
|| is_rel
;
1644 // Perform a relocation.
1647 Target_i386::Relocate::relocate(const Relocate_info
<32, false>* relinfo
,
1648 Target_i386
* target
,
1649 Output_section
*output_section
,
1651 const elfcpp::Rel
<32, false>& rel
,
1652 unsigned int r_type
,
1653 const Sized_symbol
<32>* gsym
,
1654 const Symbol_value
<32>* psymval
,
1655 unsigned char* view
,
1656 elfcpp::Elf_types
<32>::Elf_Addr address
,
1657 section_size_type view_size
)
1659 if (this->skip_call_tls_get_addr_
)
1661 if ((r_type
!= elfcpp::R_386_PLT32
1662 && r_type
!= elfcpp::R_386_PC32
)
1664 || strcmp(gsym
->name(), "___tls_get_addr") != 0)
1665 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
1666 _("missing expected TLS relocation"));
1669 this->skip_call_tls_get_addr_
= false;
1674 // Pick the value to use for symbols defined in shared objects.
1675 Symbol_value
<32> symval
;
1677 && gsym
->use_plt_offset(r_type
== elfcpp::R_386_PC8
1678 || r_type
== elfcpp::R_386_PC16
1679 || r_type
== elfcpp::R_386_PC32
))
1681 symval
.set_output_value(target
->plt_section()->address()
1682 + gsym
->plt_offset());
1686 const Sized_relobj
<32, false>* object
= relinfo
->object
;
1688 // Get the GOT offset if needed.
1689 // The GOT pointer points to the end of the GOT section.
1690 // We need to subtract the size of the GOT section to get
1691 // the actual offset to use in the relocation.
1692 bool have_got_offset
= false;
1693 unsigned int got_offset
= 0;
1696 case elfcpp::R_386_GOT32
:
1699 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
1700 got_offset
= (gsym
->got_offset(GOT_TYPE_STANDARD
)
1701 - target
->got_size());
1705 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
1706 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
1707 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
1708 - target
->got_size());
1710 have_got_offset
= true;
1719 case elfcpp::R_386_NONE
:
1720 case elfcpp::R_386_GNU_VTINHERIT
:
1721 case elfcpp::R_386_GNU_VTENTRY
:
1724 case elfcpp::R_386_32
:
1725 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, true,
1727 Relocate_functions
<32, false>::rel32(view
, object
, psymval
);
1730 case elfcpp::R_386_PC32
:
1732 int ref_flags
= Symbol::NON_PIC_REF
;
1733 if (gsym
!= NULL
&& gsym
->is_func())
1734 ref_flags
|= Symbol::FUNCTION_CALL
;
1735 if (should_apply_static_reloc(gsym
, ref_flags
, true, output_section
))
1736 Relocate_functions
<32, false>::pcrel32(view
, object
, psymval
, address
);
1740 case elfcpp::R_386_16
:
1741 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, false,
1743 Relocate_functions
<32, false>::rel16(view
, object
, psymval
);
1746 case elfcpp::R_386_PC16
:
1748 int ref_flags
= Symbol::NON_PIC_REF
;
1749 if (gsym
!= NULL
&& gsym
->is_func())
1750 ref_flags
|= Symbol::FUNCTION_CALL
;
1751 if (should_apply_static_reloc(gsym
, ref_flags
, false, output_section
))
1752 Relocate_functions
<32, false>::pcrel16(view
, object
, psymval
, address
);
1756 case elfcpp::R_386_8
:
1757 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, false,
1759 Relocate_functions
<32, false>::rel8(view
, object
, psymval
);
1762 case elfcpp::R_386_PC8
:
1764 int ref_flags
= Symbol::NON_PIC_REF
;
1765 if (gsym
!= NULL
&& gsym
->is_func())
1766 ref_flags
|= Symbol::FUNCTION_CALL
;
1767 if (should_apply_static_reloc(gsym
, ref_flags
, false,
1769 Relocate_functions
<32, false>::pcrel8(view
, object
, psymval
, address
);
1773 case elfcpp::R_386_PLT32
:
1774 gold_assert(gsym
== NULL
1775 || gsym
->has_plt_offset()
1776 || gsym
->final_value_is_known()
1777 || (gsym
->is_defined()
1778 && !gsym
->is_from_dynobj()
1779 && !gsym
->is_preemptible()));
1780 Relocate_functions
<32, false>::pcrel32(view
, object
, psymval
, address
);
1783 case elfcpp::R_386_GOT32
:
1784 gold_assert(have_got_offset
);
1785 Relocate_functions
<32, false>::rel32(view
, got_offset
);
1788 case elfcpp::R_386_GOTOFF
:
1790 elfcpp::Elf_types
<32>::Elf_Addr value
;
1791 value
= (psymval
->value(object
, 0)
1792 - target
->got_plt_section()->address());
1793 Relocate_functions
<32, false>::rel32(view
, value
);
1797 case elfcpp::R_386_GOTPC
:
1799 elfcpp::Elf_types
<32>::Elf_Addr value
;
1800 value
= target
->got_plt_section()->address();
1801 Relocate_functions
<32, false>::pcrel32(view
, value
, address
);
1805 case elfcpp::R_386_COPY
:
1806 case elfcpp::R_386_GLOB_DAT
:
1807 case elfcpp::R_386_JUMP_SLOT
:
1808 case elfcpp::R_386_RELATIVE
:
1809 // These are outstanding tls relocs, which are unexpected when
1811 case elfcpp::R_386_TLS_TPOFF
:
1812 case elfcpp::R_386_TLS_DTPMOD32
:
1813 case elfcpp::R_386_TLS_DTPOFF32
:
1814 case elfcpp::R_386_TLS_TPOFF32
:
1815 case elfcpp::R_386_TLS_DESC
:
1816 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
1817 _("unexpected reloc %u in object file"),
1821 // These are initial tls relocs, which are expected when
1823 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1824 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
1825 case elfcpp::R_386_TLS_DESC_CALL
:
1826 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1827 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1828 case elfcpp::R_386_TLS_IE
: // Initial-exec
1829 case elfcpp::R_386_TLS_IE_32
:
1830 case elfcpp::R_386_TLS_GOTIE
:
1831 case elfcpp::R_386_TLS_LE
: // Local-exec
1832 case elfcpp::R_386_TLS_LE_32
:
1833 this->relocate_tls(relinfo
, target
, relnum
, rel
, r_type
, gsym
, psymval
,
1834 view
, address
, view_size
);
1837 case elfcpp::R_386_32PLT
:
1838 case elfcpp::R_386_TLS_GD_32
:
1839 case elfcpp::R_386_TLS_GD_PUSH
:
1840 case elfcpp::R_386_TLS_GD_CALL
:
1841 case elfcpp::R_386_TLS_GD_POP
:
1842 case elfcpp::R_386_TLS_LDM_32
:
1843 case elfcpp::R_386_TLS_LDM_PUSH
:
1844 case elfcpp::R_386_TLS_LDM_CALL
:
1845 case elfcpp::R_386_TLS_LDM_POP
:
1846 case elfcpp::R_386_USED_BY_INTEL_200
:
1848 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
1849 _("unsupported reloc %u"),
1857 // Perform a TLS relocation.
1860 Target_i386::Relocate::relocate_tls(const Relocate_info
<32, false>* relinfo
,
1861 Target_i386
* target
,
1863 const elfcpp::Rel
<32, false>& rel
,
1864 unsigned int r_type
,
1865 const Sized_symbol
<32>* gsym
,
1866 const Symbol_value
<32>* psymval
,
1867 unsigned char* view
,
1868 elfcpp::Elf_types
<32>::Elf_Addr
,
1869 section_size_type view_size
)
1871 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
1873 const Sized_relobj
<32, false>* object
= relinfo
->object
;
1875 elfcpp::Elf_types
<32>::Elf_Addr value
= psymval
->value(object
, 0);
1877 const bool is_final
=
1879 ? !parameters
->options().output_is_position_independent()
1880 : gsym
->final_value_is_known());
1881 const tls::Tls_optimization optimized_type
1882 = Target_i386::optimize_tls_reloc(is_final
, r_type
);
1885 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1886 if (optimized_type
== tls::TLSOPT_TO_LE
)
1888 gold_assert(tls_segment
!= NULL
);
1889 this->tls_gd_to_le(relinfo
, relnum
, tls_segment
,
1890 rel
, r_type
, value
, view
,
1896 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
1897 ? GOT_TYPE_TLS_NOFFSET
1898 : GOT_TYPE_TLS_PAIR
);
1899 unsigned int got_offset
;
1902 gold_assert(gsym
->has_got_offset(got_type
));
1903 got_offset
= gsym
->got_offset(got_type
) - target
->got_size();
1907 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
1908 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
1909 got_offset
= (object
->local_got_offset(r_sym
, got_type
)
1910 - target
->got_size());
1912 if (optimized_type
== tls::TLSOPT_TO_IE
)
1914 gold_assert(tls_segment
!= NULL
);
1915 this->tls_gd_to_ie(relinfo
, relnum
, tls_segment
, rel
, r_type
,
1916 got_offset
, view
, view_size
);
1919 else if (optimized_type
== tls::TLSOPT_NONE
)
1921 // Relocate the field with the offset of the pair of GOT
1923 Relocate_functions
<32, false>::rel32(view
, got_offset
);
1927 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
1928 _("unsupported reloc %u"),
1932 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
1933 case elfcpp::R_386_TLS_DESC_CALL
:
1934 this->local_dynamic_type_
= LOCAL_DYNAMIC_GNU
;
1935 if (optimized_type
== tls::TLSOPT_TO_LE
)
1937 gold_assert(tls_segment
!= NULL
);
1938 this->tls_desc_gd_to_le(relinfo
, relnum
, tls_segment
,
1939 rel
, r_type
, value
, view
,
1945 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
1946 ? GOT_TYPE_TLS_NOFFSET
1947 : GOT_TYPE_TLS_DESC
);
1948 unsigned int got_offset
;
1951 gold_assert(gsym
->has_got_offset(got_type
));
1952 got_offset
= gsym
->got_offset(got_type
) - target
->got_size();
1956 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
1957 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
1958 got_offset
= (object
->local_got_offset(r_sym
, got_type
)
1959 - target
->got_size());
1961 if (optimized_type
== tls::TLSOPT_TO_IE
)
1963 gold_assert(tls_segment
!= NULL
);
1964 this->tls_desc_gd_to_ie(relinfo
, relnum
, tls_segment
, rel
, r_type
,
1965 got_offset
, view
, view_size
);
1968 else if (optimized_type
== tls::TLSOPT_NONE
)
1970 if (r_type
== elfcpp::R_386_TLS_GOTDESC
)
1972 // Relocate the field with the offset of the pair of GOT
1974 Relocate_functions
<32, false>::rel32(view
, got_offset
);
1979 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
1980 _("unsupported reloc %u"),
1984 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1985 if (this->local_dynamic_type_
== LOCAL_DYNAMIC_SUN
)
1987 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
1988 _("both SUN and GNU model "
1989 "TLS relocations"));
1992 this->local_dynamic_type_
= LOCAL_DYNAMIC_GNU
;
1993 if (optimized_type
== tls::TLSOPT_TO_LE
)
1995 gold_assert(tls_segment
!= NULL
);
1996 this->tls_ld_to_le(relinfo
, relnum
, tls_segment
, rel
, r_type
,
1997 value
, view
, view_size
);
2000 else if (optimized_type
== tls::TLSOPT_NONE
)
2002 // Relocate the field with the offset of the GOT entry for
2003 // the module index.
2004 unsigned int got_offset
;
2005 got_offset
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
)
2006 - target
->got_size());
2007 Relocate_functions
<32, false>::rel32(view
, got_offset
);
2010 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2011 _("unsupported reloc %u"),
2015 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
2016 if (optimized_type
== tls::TLSOPT_TO_LE
)
2018 // This reloc can appear in debugging sections, in which
2019 // case we must not convert to local-exec. We decide what
2020 // to do based on whether the section is marked as
2021 // containing executable code. That is what the GNU linker
2023 elfcpp::Shdr
<32, false> shdr(relinfo
->data_shdr
);
2024 if ((shdr
.get_sh_flags() & elfcpp::SHF_EXECINSTR
) != 0)
2026 gold_assert(tls_segment
!= NULL
);
2027 value
-= tls_segment
->memsz();
2030 Relocate_functions
<32, false>::rel32(view
, value
);
2033 case elfcpp::R_386_TLS_IE
: // Initial-exec
2034 case elfcpp::R_386_TLS_GOTIE
:
2035 case elfcpp::R_386_TLS_IE_32
:
2036 if (optimized_type
== tls::TLSOPT_TO_LE
)
2038 gold_assert(tls_segment
!= NULL
);
2039 Target_i386::Relocate::tls_ie_to_le(relinfo
, relnum
, tls_segment
,
2040 rel
, r_type
, value
, view
,
2044 else if (optimized_type
== tls::TLSOPT_NONE
)
2046 // Relocate the field with the offset of the GOT entry for
2047 // the tp-relative offset of the symbol.
2048 unsigned int got_type
= (r_type
== elfcpp::R_386_TLS_IE_32
2049 ? GOT_TYPE_TLS_OFFSET
2050 : GOT_TYPE_TLS_NOFFSET
);
2051 unsigned int got_offset
;
2054 gold_assert(gsym
->has_got_offset(got_type
));
2055 got_offset
= gsym
->got_offset(got_type
);
2059 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
2060 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
2061 got_offset
= object
->local_got_offset(r_sym
, got_type
);
2063 // For the R_386_TLS_IE relocation, we need to apply the
2064 // absolute address of the GOT entry.
2065 if (r_type
== elfcpp::R_386_TLS_IE
)
2066 got_offset
+= target
->got_plt_section()->address();
2067 // All GOT offsets are relative to the end of the GOT.
2068 got_offset
-= target
->got_size();
2069 Relocate_functions
<32, false>::rel32(view
, got_offset
);
2072 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2073 _("unsupported reloc %u"),
2077 case elfcpp::R_386_TLS_LE
: // Local-exec
2078 // If we're creating a shared library, a dynamic relocation will
2079 // have been created for this location, so do not apply it now.
2080 if (!parameters
->options().shared())
2082 gold_assert(tls_segment
!= NULL
);
2083 value
-= tls_segment
->memsz();
2084 Relocate_functions
<32, false>::rel32(view
, value
);
2088 case elfcpp::R_386_TLS_LE_32
:
2089 // If we're creating a shared library, a dynamic relocation will
2090 // have been created for this location, so do not apply it now.
2091 if (!parameters
->options().shared())
2093 gold_assert(tls_segment
!= NULL
);
2094 value
= tls_segment
->memsz() - value
;
2095 Relocate_functions
<32, false>::rel32(view
, value
);
2101 // Do a relocation in which we convert a TLS General-Dynamic to a
2105 Target_i386::Relocate::tls_gd_to_le(const Relocate_info
<32, false>* relinfo
,
2107 Output_segment
* tls_segment
,
2108 const elfcpp::Rel
<32, false>& rel
,
2110 elfcpp::Elf_types
<32>::Elf_Addr value
,
2111 unsigned char* view
,
2112 section_size_type view_size
)
2114 // leal foo(,%reg,1),%eax; call ___tls_get_addr
2115 // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
2116 // leal foo(%reg),%eax; call ___tls_get_addr
2117 // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
2119 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2120 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 9);
2122 unsigned char op1
= view
[-1];
2123 unsigned char op2
= view
[-2];
2125 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2126 op2
== 0x8d || op2
== 0x04);
2127 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[4] == 0xe8);
2133 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -3);
2134 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[-3] == 0x8d);
2135 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2136 ((op1
& 0xc7) == 0x05 && op1
!= (4 << 3)));
2137 memcpy(view
- 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2141 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2142 (op1
& 0xf8) == 0x80 && (op1
& 7) != 4);
2143 if (rel
.get_r_offset() + 9 < view_size
2146 // There is a trailing nop. Use the size byte subl.
2147 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2152 // Use the five byte subl.
2153 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2157 value
= tls_segment
->memsz() - value
;
2158 Relocate_functions
<32, false>::rel32(view
+ roff
, value
);
2160 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2162 this->skip_call_tls_get_addr_
= true;
2165 // Do a relocation in which we convert a TLS General-Dynamic to an
2169 Target_i386::Relocate::tls_gd_to_ie(const Relocate_info
<32, false>* relinfo
,
2172 const elfcpp::Rel
<32, false>& rel
,
2174 elfcpp::Elf_types
<32>::Elf_Addr value
,
2175 unsigned char* view
,
2176 section_size_type view_size
)
2178 // leal foo(,%ebx,1),%eax; call ___tls_get_addr
2179 // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax
2181 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2182 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 9);
2184 unsigned char op1
= view
[-1];
2185 unsigned char op2
= view
[-2];
2187 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2188 op2
== 0x8d || op2
== 0x04);
2189 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[4] == 0xe8);
2193 // FIXME: For now, support only the first (SIB) form.
2194 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), op2
== 0x04);
2198 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -3);
2199 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[-3] == 0x8d);
2200 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2201 ((op1
& 0xc7) == 0x05 && op1
!= (4 << 3)));
2202 memcpy(view
- 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12);
2206 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2207 (op1
& 0xf8) == 0x80 && (op1
& 7) != 4);
2208 if (rel
.get_r_offset() + 9 < view_size
2211 // FIXME: This is not the right instruction sequence.
2212 // There is a trailing nop. Use the size byte subl.
2213 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2218 // FIXME: This is not the right instruction sequence.
2219 // Use the five byte subl.
2220 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2224 Relocate_functions
<32, false>::rel32(view
+ roff
, value
);
2226 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2228 this->skip_call_tls_get_addr_
= true;
2231 // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL
2232 // General-Dynamic to a Local-Exec.
2235 Target_i386::Relocate::tls_desc_gd_to_le(
2236 const Relocate_info
<32, false>* relinfo
,
2238 Output_segment
* tls_segment
,
2239 const elfcpp::Rel
<32, false>& rel
,
2240 unsigned int r_type
,
2241 elfcpp::Elf_types
<32>::Elf_Addr value
,
2242 unsigned char* view
,
2243 section_size_type view_size
)
2245 if (r_type
== elfcpp::R_386_TLS_GOTDESC
)
2247 // leal foo@TLSDESC(%ebx), %eax
2248 // ==> leal foo@NTPOFF, %eax
2249 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2250 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
2251 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2252 view
[-2] == 0x8d && view
[-1] == 0x83);
2254 value
-= tls_segment
->memsz();
2255 Relocate_functions
<32, false>::rel32(view
, value
);
2259 // call *foo@TLSCALL(%eax)
2261 gold_assert(r_type
== elfcpp::R_386_TLS_DESC_CALL
);
2262 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 2);
2263 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2264 view
[0] == 0xff && view
[1] == 0x10);
2270 // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL
2271 // General-Dynamic to an Initial-Exec.
2274 Target_i386::Relocate::tls_desc_gd_to_ie(
2275 const Relocate_info
<32, false>* relinfo
,
2278 const elfcpp::Rel
<32, false>& rel
,
2279 unsigned int r_type
,
2280 elfcpp::Elf_types
<32>::Elf_Addr value
,
2281 unsigned char* view
,
2282 section_size_type view_size
)
2284 if (r_type
== elfcpp::R_386_TLS_GOTDESC
)
2286 // leal foo@TLSDESC(%ebx), %eax
2287 // ==> movl foo@GOTNTPOFF(%ebx), %eax
2288 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2289 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
2290 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2291 view
[-2] == 0x8d && view
[-1] == 0x83);
2293 Relocate_functions
<32, false>::rel32(view
, value
);
2297 // call *foo@TLSCALL(%eax)
2299 gold_assert(r_type
== elfcpp::R_386_TLS_DESC_CALL
);
2300 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 2);
2301 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2302 view
[0] == 0xff && view
[1] == 0x10);
2308 // Do a relocation in which we convert a TLS Local-Dynamic to a
2312 Target_i386::Relocate::tls_ld_to_le(const Relocate_info
<32, false>* relinfo
,
2315 const elfcpp::Rel
<32, false>& rel
,
2317 elfcpp::Elf_types
<32>::Elf_Addr
,
2318 unsigned char* view
,
2319 section_size_type view_size
)
2321 // leal foo(%reg), %eax; call ___tls_get_addr
2322 // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi
2324 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2325 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 9);
2327 // FIXME: Does this test really always pass?
2328 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2329 view
[-2] == 0x8d && view
[-1] == 0x83);
2331 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[4] == 0xe8);
2333 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11);
2335 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2337 this->skip_call_tls_get_addr_
= true;
2340 // Do a relocation in which we convert a TLS Initial-Exec to a
2344 Target_i386::Relocate::tls_ie_to_le(const Relocate_info
<32, false>* relinfo
,
2346 Output_segment
* tls_segment
,
2347 const elfcpp::Rel
<32, false>& rel
,
2348 unsigned int r_type
,
2349 elfcpp::Elf_types
<32>::Elf_Addr value
,
2350 unsigned char* view
,
2351 section_size_type view_size
)
2353 // We have to actually change the instructions, which means that we
2354 // need to examine the opcodes to figure out which instruction we
2356 if (r_type
== elfcpp::R_386_TLS_IE
)
2358 // movl %gs:XX,%eax ==> movl $YY,%eax
2359 // movl %gs:XX,%reg ==> movl $YY,%reg
2360 // addl %gs:XX,%reg ==> addl $YY,%reg
2361 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -1);
2362 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
2364 unsigned char op1
= view
[-1];
2367 // movl XX,%eax ==> movl $YY,%eax
2372 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2374 unsigned char op2
= view
[-2];
2377 // movl XX,%reg ==> movl $YY,%reg
2378 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2379 (op1
& 0xc7) == 0x05);
2381 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
2383 else if (op2
== 0x03)
2385 // addl XX,%reg ==> addl $YY,%reg
2386 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2387 (op1
& 0xc7) == 0x05);
2389 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
2392 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), 0);
2397 // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
2398 // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
2399 // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
2400 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2401 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
2403 unsigned char op1
= view
[-1];
2404 unsigned char op2
= view
[-2];
2405 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2406 (op1
& 0xc0) == 0x80 && (op1
& 7) != 4);
2409 // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
2411 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
2413 else if (op2
== 0x2b)
2415 // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
2417 view
[-1] = 0xe8 | ((op1
>> 3) & 7);
2419 else if (op2
== 0x03)
2421 // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
2423 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
2426 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), 0);
2429 value
= tls_segment
->memsz() - value
;
2430 if (r_type
== elfcpp::R_386_TLS_IE
|| r_type
== elfcpp::R_386_TLS_GOTIE
)
2433 Relocate_functions
<32, false>::rel32(view
, value
);
2436 // Relocate section data.
2439 Target_i386::relocate_section(const Relocate_info
<32, false>* relinfo
,
2440 unsigned int sh_type
,
2441 const unsigned char* prelocs
,
2443 Output_section
* output_section
,
2444 bool needs_special_offset_handling
,
2445 unsigned char* view
,
2446 elfcpp::Elf_types
<32>::Elf_Addr address
,
2447 section_size_type view_size
,
2448 const Reloc_symbol_changes
* reloc_symbol_changes
)
2450 gold_assert(sh_type
== elfcpp::SHT_REL
);
2452 gold::relocate_section
<32, false, Target_i386
, elfcpp::SHT_REL
,
2453 Target_i386::Relocate
>(
2459 needs_special_offset_handling
,
2463 reloc_symbol_changes
);
2466 // Return the size of a relocation while scanning during a relocatable
2470 Target_i386::Relocatable_size_for_reloc::get_size_for_reloc(
2471 unsigned int r_type
,
2476 case elfcpp::R_386_NONE
:
2477 case elfcpp::R_386_GNU_VTINHERIT
:
2478 case elfcpp::R_386_GNU_VTENTRY
:
2479 case elfcpp::R_386_TLS_GD
: // Global-dynamic
2480 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
2481 case elfcpp::R_386_TLS_DESC_CALL
:
2482 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
2483 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
2484 case elfcpp::R_386_TLS_IE
: // Initial-exec
2485 case elfcpp::R_386_TLS_IE_32
:
2486 case elfcpp::R_386_TLS_GOTIE
:
2487 case elfcpp::R_386_TLS_LE
: // Local-exec
2488 case elfcpp::R_386_TLS_LE_32
:
2491 case elfcpp::R_386_32
:
2492 case elfcpp::R_386_PC32
:
2493 case elfcpp::R_386_GOT32
:
2494 case elfcpp::R_386_PLT32
:
2495 case elfcpp::R_386_GOTOFF
:
2496 case elfcpp::R_386_GOTPC
:
2499 case elfcpp::R_386_16
:
2500 case elfcpp::R_386_PC16
:
2503 case elfcpp::R_386_8
:
2504 case elfcpp::R_386_PC8
:
2507 // These are relocations which should only be seen by the
2508 // dynamic linker, and should never be seen here.
2509 case elfcpp::R_386_COPY
:
2510 case elfcpp::R_386_GLOB_DAT
:
2511 case elfcpp::R_386_JUMP_SLOT
:
2512 case elfcpp::R_386_RELATIVE
:
2513 case elfcpp::R_386_TLS_TPOFF
:
2514 case elfcpp::R_386_TLS_DTPMOD32
:
2515 case elfcpp::R_386_TLS_DTPOFF32
:
2516 case elfcpp::R_386_TLS_TPOFF32
:
2517 case elfcpp::R_386_TLS_DESC
:
2518 object
->error(_("unexpected reloc %u in object file"), r_type
);
2521 case elfcpp::R_386_32PLT
:
2522 case elfcpp::R_386_TLS_GD_32
:
2523 case elfcpp::R_386_TLS_GD_PUSH
:
2524 case elfcpp::R_386_TLS_GD_CALL
:
2525 case elfcpp::R_386_TLS_GD_POP
:
2526 case elfcpp::R_386_TLS_LDM_32
:
2527 case elfcpp::R_386_TLS_LDM_PUSH
:
2528 case elfcpp::R_386_TLS_LDM_CALL
:
2529 case elfcpp::R_386_TLS_LDM_POP
:
2530 case elfcpp::R_386_USED_BY_INTEL_200
:
2532 object
->error(_("unsupported reloc %u in object file"), r_type
);
2537 // Scan the relocs during a relocatable link.
2540 Target_i386::scan_relocatable_relocs(Symbol_table
* symtab
,
2542 Sized_relobj
<32, false>* object
,
2543 unsigned int data_shndx
,
2544 unsigned int sh_type
,
2545 const unsigned char* prelocs
,
2547 Output_section
* output_section
,
2548 bool needs_special_offset_handling
,
2549 size_t local_symbol_count
,
2550 const unsigned char* plocal_symbols
,
2551 Relocatable_relocs
* rr
)
2553 gold_assert(sh_type
== elfcpp::SHT_REL
);
2555 typedef gold::Default_scan_relocatable_relocs
<elfcpp::SHT_REL
,
2556 Relocatable_size_for_reloc
> Scan_relocatable_relocs
;
2558 gold::scan_relocatable_relocs
<32, false, elfcpp::SHT_REL
,
2559 Scan_relocatable_relocs
>(
2567 needs_special_offset_handling
,
2573 // Relocate a section during a relocatable link.
2576 Target_i386::relocate_for_relocatable(
2577 const Relocate_info
<32, false>* relinfo
,
2578 unsigned int sh_type
,
2579 const unsigned char* prelocs
,
2581 Output_section
* output_section
,
2582 off_t offset_in_output_section
,
2583 const Relocatable_relocs
* rr
,
2584 unsigned char* view
,
2585 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
2586 section_size_type view_size
,
2587 unsigned char* reloc_view
,
2588 section_size_type reloc_view_size
)
2590 gold_assert(sh_type
== elfcpp::SHT_REL
);
2592 gold::relocate_for_relocatable
<32, false, elfcpp::SHT_REL
>(
2597 offset_in_output_section
,
2606 // Return the value to use for a dynamic which requires special
2607 // treatment. This is how we support equality comparisons of function
2608 // pointers across shared library boundaries, as described in the
2609 // processor specific ABI supplement.
2612 Target_i386::do_dynsym_value(const Symbol
* gsym
) const
2614 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
2615 return this->plt_section()->address() + gsym
->plt_offset();
2618 // Return a string used to fill a code section with nops to take up
2619 // the specified length.
2622 Target_i386::do_code_fill(section_size_type length
) const
2626 // Build a jmp instruction to skip over the bytes.
2627 unsigned char jmp
[5];
2629 elfcpp::Swap_unaligned
<32, false>::writeval(jmp
+ 1, length
- 5);
2630 return (std::string(reinterpret_cast<char*>(&jmp
[0]), 5)
2631 + std::string(length
- 5, '\0'));
2634 // Nop sequences of various lengths.
2635 const char nop1
[1] = { 0x90 }; // nop
2636 const char nop2
[2] = { 0x66, 0x90 }; // xchg %ax %ax
2637 const char nop3
[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi
2638 const char nop4
[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi
2639 const char nop5
[5] = { 0x90, 0x8d, 0x74, 0x26, // nop
2640 0x00 }; // leal 0(%esi,1),%esi
2641 const char nop6
[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
2643 const char nop7
[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
2645 const char nop8
[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop
2646 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi
2647 const char nop9
[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi
2648 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi
2650 const char nop10
[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi
2651 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi
2653 const char nop11
[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi
2654 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi
2656 const char nop12
[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
2657 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi
2658 0x00, 0x00, 0x00, 0x00 };
2659 const char nop13
[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
2660 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi
2661 0x27, 0x00, 0x00, 0x00,
2663 const char nop14
[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
2664 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi
2665 0xbc, 0x27, 0x00, 0x00,
2667 const char nop15
[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15
2668 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,...
2669 0x90, 0x90, 0x90, 0x90,
2672 const char* nops
[16] = {
2674 nop1
, nop2
, nop3
, nop4
, nop5
, nop6
, nop7
,
2675 nop8
, nop9
, nop10
, nop11
, nop12
, nop13
, nop14
, nop15
2678 return std::string(nops
[length
], length
);
2681 // FNOFFSET in section SHNDX in OBJECT is the start of a function
2682 // compiled with -fstack-split. The function calls non-stack-split
2683 // code. We have to change the function so that it always ensures
2684 // that it has enough stack space to run some random function.
2687 Target_i386::do_calls_non_split(Relobj
* object
, unsigned int shndx
,
2688 section_offset_type fnoffset
,
2689 section_size_type fnsize
,
2690 unsigned char* view
,
2691 section_size_type view_size
,
2693 std::string
* to
) const
2695 // The function starts with a comparison of the stack pointer and a
2696 // field in the TCB. This is followed by a jump.
2699 if (this->match_view(view
, view_size
, fnoffset
, "\x65\x3b\x25", 3)
2702 // We will call __morestack if the carry flag is set after this
2703 // comparison. We turn the comparison into an stc instruction
2705 view
[fnoffset
] = '\xf9';
2706 this->set_view_to_nop(view
, view_size
, fnoffset
+ 1, 6);
2708 // lea NN(%esp),%ecx
2709 // lea NN(%esp),%edx
2710 else if ((this->match_view(view
, view_size
, fnoffset
, "\x8d\x8c\x24", 3)
2711 || this->match_view(view
, view_size
, fnoffset
, "\x8d\x94\x24", 3))
2714 // This is loading an offset from the stack pointer for a
2715 // comparison. The offset is negative, so we decrease the
2716 // offset by the amount of space we need for the stack. This
2717 // means we will avoid calling __morestack if there happens to
2718 // be plenty of space on the stack already.
2719 unsigned char* pval
= view
+ fnoffset
+ 3;
2720 uint32_t val
= elfcpp::Swap_unaligned
<32, false>::readval(pval
);
2721 val
-= parameters
->options().split_stack_adjust_size();
2722 elfcpp::Swap_unaligned
<32, false>::writeval(pval
, val
);
2726 if (!object
->has_no_split_stack())
2727 object
->error(_("failed to match split-stack sequence at "
2728 "section %u offset %0zx"),
2729 shndx
, static_cast<size_t>(fnoffset
));
2733 // We have to change the function so that it calls
2734 // __morestack_non_split instead of __morestack. The former will
2735 // allocate additional stack space.
2736 *from
= "__morestack";
2737 *to
= "__morestack_non_split";
2740 // The selector for i386 object files.
2742 class Target_selector_i386
: public Target_selector_freebsd
2745 Target_selector_i386()
2746 : Target_selector_freebsd(elfcpp::EM_386
, 32, false,
2747 "elf32-i386", "elf32-i386-freebsd")
2751 do_instantiate_target()
2752 { return new Target_i386(); }
2755 Target_selector_i386 target_selector_i386
;
2757 } // End anonymous namespace.