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
),
467 // The old GNU linker creates a .got.plt section. We just
468 // create another set of data in the .got section. Note that we
469 // always create a PLT if we create a GOT, although the PLT
471 this->got_plt_
= new Output_data_space(4, "** GOT PLT");
472 os
= layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
474 | elfcpp::SHF_WRITE
),
475 this->got_plt_
, false);
478 // The first three entries are reserved.
479 this->got_plt_
->set_current_data_size(3 * 4);
481 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
482 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
483 Symbol_table::PREDEFINED
,
485 0, 0, elfcpp::STT_OBJECT
,
487 elfcpp::STV_HIDDEN
, 0,
494 // Get the dynamic reloc section, creating it if necessary.
496 Target_i386::Reloc_section
*
497 Target_i386::rel_dyn_section(Layout
* layout
)
499 if (this->rel_dyn_
== NULL
)
501 gold_assert(layout
!= NULL
);
502 this->rel_dyn_
= new Reloc_section(parameters
->options().combreloc());
503 layout
->add_output_section_data(".rel.dyn", elfcpp::SHT_REL
,
504 elfcpp::SHF_ALLOC
, this->rel_dyn_
, true);
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);
583 Output_data_plt_i386::do_adjust_output_section(Output_section
* os
)
585 // UnixWare sets the entsize of .plt to 4, and so does the old GNU
586 // linker, and so do we.
590 // Add an entry to the PLT.
593 Output_data_plt_i386::add_entry(Symbol
* gsym
)
595 gold_assert(!gsym
->has_plt_offset());
597 // Note that when setting the PLT offset we skip the initial
598 // reserved PLT entry.
599 gsym
->set_plt_offset((this->count_
+ 1) * plt_entry_size
);
603 section_offset_type got_offset
= this->got_plt_
->current_data_size();
605 // Every PLT entry needs a GOT entry which points back to the PLT
606 // entry (this will be changed by the dynamic linker, normally
607 // lazily when the function is called).
608 this->got_plt_
->set_current_data_size(got_offset
+ 4);
610 // Every PLT entry needs a reloc.
611 gsym
->set_needs_dynsym_entry();
612 this->rel_
->add_global(gsym
, elfcpp::R_386_JUMP_SLOT
, this->got_plt_
,
615 // Note that we don't need to save the symbol. The contents of the
616 // PLT are independent of which symbols are used. The symbols only
617 // appear in the relocations.
620 // The first entry in the PLT for an executable.
622 unsigned char Output_data_plt_i386::exec_first_plt_entry
[plt_entry_size
] =
624 0xff, 0x35, // pushl contents of memory address
625 0, 0, 0, 0, // replaced with address of .got + 4
626 0xff, 0x25, // jmp indirect
627 0, 0, 0, 0, // replaced with address of .got + 8
631 // The first entry in the PLT for a shared object.
633 unsigned char Output_data_plt_i386::dyn_first_plt_entry
[plt_entry_size
] =
635 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx)
636 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx)
640 // Subsequent entries in the PLT for an executable.
642 unsigned char Output_data_plt_i386::exec_plt_entry
[plt_entry_size
] =
644 0xff, 0x25, // jmp indirect
645 0, 0, 0, 0, // replaced with address of symbol in .got
646 0x68, // pushl immediate
647 0, 0, 0, 0, // replaced with offset into relocation table
648 0xe9, // jmp relative
649 0, 0, 0, 0 // replaced with offset to start of .plt
652 // Subsequent entries in the PLT for a shared object.
654 unsigned char Output_data_plt_i386::dyn_plt_entry
[plt_entry_size
] =
656 0xff, 0xa3, // jmp *offset(%ebx)
657 0, 0, 0, 0, // replaced with offset of symbol in .got
658 0x68, // pushl immediate
659 0, 0, 0, 0, // replaced with offset into relocation table
660 0xe9, // jmp relative
661 0, 0, 0, 0 // replaced with offset to start of .plt
664 // Write out the PLT. This uses the hand-coded instructions above,
665 // and adjusts them as needed. This is all specified by the i386 ELF
666 // Processor Supplement.
669 Output_data_plt_i386::do_write(Output_file
* of
)
671 const off_t offset
= this->offset();
672 const section_size_type oview_size
=
673 convert_to_section_size_type(this->data_size());
674 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
676 const off_t got_file_offset
= this->got_plt_
->offset();
677 const section_size_type got_size
=
678 convert_to_section_size_type(this->got_plt_
->data_size());
679 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
682 unsigned char* pov
= oview
;
684 elfcpp::Elf_types
<32>::Elf_Addr plt_address
= this->address();
685 elfcpp::Elf_types
<32>::Elf_Addr got_address
= this->got_plt_
->address();
687 if (parameters
->options().output_is_position_independent())
688 memcpy(pov
, dyn_first_plt_entry
, plt_entry_size
);
691 memcpy(pov
, exec_first_plt_entry
, plt_entry_size
);
692 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2, got_address
+ 4);
693 elfcpp::Swap
<32, false>::writeval(pov
+ 8, got_address
+ 8);
695 pov
+= plt_entry_size
;
697 unsigned char* got_pov
= got_view
;
699 memset(got_pov
, 0, 12);
702 const int rel_size
= elfcpp::Elf_sizes
<32>::rel_size
;
704 unsigned int plt_offset
= plt_entry_size
;
705 unsigned int plt_rel_offset
= 0;
706 unsigned int got_offset
= 12;
707 const unsigned int count
= this->count_
;
708 for (unsigned int i
= 0;
711 pov
+= plt_entry_size
,
713 plt_offset
+= plt_entry_size
,
714 plt_rel_offset
+= rel_size
,
717 // Set and adjust the PLT entry itself.
719 if (parameters
->options().output_is_position_independent())
721 memcpy(pov
, dyn_plt_entry
, plt_entry_size
);
722 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2, got_offset
);
726 memcpy(pov
, exec_plt_entry
, plt_entry_size
);
727 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
732 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 7, plt_rel_offset
);
733 elfcpp::Swap
<32, false>::writeval(pov
+ 12,
734 - (plt_offset
+ plt_entry_size
));
736 // Set the entry in the GOT.
737 elfcpp::Swap
<32, false>::writeval(got_pov
, plt_address
+ plt_offset
+ 6);
740 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
741 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
743 of
->write_output_view(offset
, oview_size
, oview
);
744 of
->write_output_view(got_file_offset
, got_size
, got_view
);
747 // Create a PLT entry for a global symbol.
750 Target_i386::make_plt_entry(Symbol_table
* symtab
, Layout
* layout
, Symbol
* gsym
)
752 if (gsym
->has_plt_offset())
755 if (this->plt_
== NULL
)
757 // Create the GOT sections first.
758 this->got_section(symtab
, layout
);
760 this->plt_
= new Output_data_plt_i386(layout
, this->got_plt_
);
761 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
763 | elfcpp::SHF_EXECINSTR
),
767 this->plt_
->add_entry(gsym
);
770 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
773 Target_i386::define_tls_base_symbol(Symbol_table
* symtab
, Layout
* layout
)
775 if (this->tls_base_symbol_defined_
)
778 Output_segment
* tls_segment
= layout
->tls_segment();
779 if (tls_segment
!= NULL
)
781 bool is_exec
= parameters
->options().output_is_executable();
782 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
783 Symbol_table::PREDEFINED
,
787 elfcpp::STV_HIDDEN
, 0,
789 ? Symbol::SEGMENT_END
790 : Symbol::SEGMENT_START
),
793 this->tls_base_symbol_defined_
= true;
796 // Create a GOT entry for the TLS module index.
799 Target_i386::got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
800 Sized_relobj
<32, false>* object
)
802 if (this->got_mod_index_offset_
== -1U)
804 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
805 Reloc_section
* rel_dyn
= this->rel_dyn_section(layout
);
806 Output_data_got
<32, false>* got
= this->got_section(symtab
, layout
);
807 unsigned int got_offset
= got
->add_constant(0);
808 rel_dyn
->add_local(object
, 0, elfcpp::R_386_TLS_DTPMOD32
, got
,
810 got
->add_constant(0);
811 this->got_mod_index_offset_
= got_offset
;
813 return this->got_mod_index_offset_
;
816 // Optimize the TLS relocation type based on what we know about the
817 // symbol. IS_FINAL is true if the final address of this symbol is
818 // known at link time.
820 tls::Tls_optimization
821 Target_i386::optimize_tls_reloc(bool is_final
, int r_type
)
823 // If we are generating a shared library, then we can't do anything
825 if (parameters
->options().shared())
826 return tls::TLSOPT_NONE
;
830 case elfcpp::R_386_TLS_GD
:
831 case elfcpp::R_386_TLS_GOTDESC
:
832 case elfcpp::R_386_TLS_DESC_CALL
:
833 // These are General-Dynamic which permits fully general TLS
834 // access. Since we know that we are generating an executable,
835 // we can convert this to Initial-Exec. If we also know that
836 // this is a local symbol, we can further switch to Local-Exec.
838 return tls::TLSOPT_TO_LE
;
839 return tls::TLSOPT_TO_IE
;
841 case elfcpp::R_386_TLS_LDM
:
842 // This is Local-Dynamic, which refers to a local symbol in the
843 // dynamic TLS block. Since we know that we generating an
844 // executable, we can switch to Local-Exec.
845 return tls::TLSOPT_TO_LE
;
847 case elfcpp::R_386_TLS_LDO_32
:
848 // Another type of Local-Dynamic relocation.
849 return tls::TLSOPT_TO_LE
;
851 case elfcpp::R_386_TLS_IE
:
852 case elfcpp::R_386_TLS_GOTIE
:
853 case elfcpp::R_386_TLS_IE_32
:
854 // These are Initial-Exec relocs which get the thread offset
855 // from the GOT. If we know that we are linking against the
856 // local symbol, we can switch to Local-Exec, which links the
857 // thread offset into the instruction.
859 return tls::TLSOPT_TO_LE
;
860 return tls::TLSOPT_NONE
;
862 case elfcpp::R_386_TLS_LE
:
863 case elfcpp::R_386_TLS_LE_32
:
864 // When we already have Local-Exec, there is nothing further we
866 return tls::TLSOPT_NONE
;
873 // Report an unsupported relocation against a local symbol.
876 Target_i386::Scan::unsupported_reloc_local(Sized_relobj
<32, false>* object
,
879 gold_error(_("%s: unsupported reloc %u against local symbol"),
880 object
->name().c_str(), r_type
);
883 // Scan a relocation for a local symbol.
886 Target_i386::Scan::local(Symbol_table
* symtab
,
889 Sized_relobj
<32, false>* object
,
890 unsigned int data_shndx
,
891 Output_section
* output_section
,
892 const elfcpp::Rel
<32, false>& reloc
,
894 const elfcpp::Sym
<32, false>& lsym
)
898 case elfcpp::R_386_NONE
:
899 case elfcpp::R_386_GNU_VTINHERIT
:
900 case elfcpp::R_386_GNU_VTENTRY
:
903 case elfcpp::R_386_32
:
904 // If building a shared library (or a position-independent
905 // executable), we need to create a dynamic relocation for
906 // this location. The relocation applied at link time will
907 // apply the link-time value, so we flag the location with
908 // an R_386_RELATIVE relocation so the dynamic loader can
909 // relocate it easily.
910 if (parameters
->options().output_is_position_independent())
912 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
913 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
914 rel_dyn
->add_local_relative(object
, r_sym
, elfcpp::R_386_RELATIVE
,
915 output_section
, data_shndx
,
916 reloc
.get_r_offset());
920 case elfcpp::R_386_16
:
921 case elfcpp::R_386_8
:
922 // If building a shared library (or a position-independent
923 // executable), we need to create a dynamic relocation for
924 // this location. Because the addend needs to remain in the
925 // data section, we need to be careful not to apply this
926 // relocation statically.
927 if (parameters
->options().output_is_position_independent())
929 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
930 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
931 if (lsym
.get_st_type() != elfcpp::STT_SECTION
)
932 rel_dyn
->add_local(object
, r_sym
, r_type
, output_section
,
933 data_shndx
, reloc
.get_r_offset());
936 gold_assert(lsym
.get_st_value() == 0);
937 unsigned int shndx
= lsym
.get_st_shndx();
939 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
,
942 object
->error(_("section symbol %u has bad shndx %u"),
945 rel_dyn
->add_local_section(object
, shndx
,
946 r_type
, output_section
,
947 data_shndx
, reloc
.get_r_offset());
952 case elfcpp::R_386_PC32
:
953 case elfcpp::R_386_PC16
:
954 case elfcpp::R_386_PC8
:
957 case elfcpp::R_386_PLT32
:
958 // Since we know this is a local symbol, we can handle this as a
962 case elfcpp::R_386_GOTOFF
:
963 case elfcpp::R_386_GOTPC
:
964 // We need a GOT section.
965 target
->got_section(symtab
, layout
);
968 case elfcpp::R_386_GOT32
:
970 // The symbol requires a GOT entry.
971 Output_data_got
<32, false>* got
= target
->got_section(symtab
, layout
);
972 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
973 if (got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
))
975 // If we are generating a shared object, we need to add a
976 // dynamic RELATIVE relocation for this symbol's GOT entry.
977 if (parameters
->options().output_is_position_independent())
979 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
980 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
981 rel_dyn
->add_local_relative(
982 object
, r_sym
, elfcpp::R_386_RELATIVE
, got
,
983 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
));
989 // These are relocations which should only be seen by the
990 // dynamic linker, and should never be seen here.
991 case elfcpp::R_386_COPY
:
992 case elfcpp::R_386_GLOB_DAT
:
993 case elfcpp::R_386_JUMP_SLOT
:
994 case elfcpp::R_386_RELATIVE
:
995 case elfcpp::R_386_TLS_TPOFF
:
996 case elfcpp::R_386_TLS_DTPMOD32
:
997 case elfcpp::R_386_TLS_DTPOFF32
:
998 case elfcpp::R_386_TLS_TPOFF32
:
999 case elfcpp::R_386_TLS_DESC
:
1000 gold_error(_("%s: unexpected reloc %u in object file"),
1001 object
->name().c_str(), r_type
);
1004 // These are initial TLS relocs, which are expected when
1006 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1007 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
1008 case elfcpp::R_386_TLS_DESC_CALL
:
1009 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1010 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1011 case elfcpp::R_386_TLS_IE
: // Initial-exec
1012 case elfcpp::R_386_TLS_IE_32
:
1013 case elfcpp::R_386_TLS_GOTIE
:
1014 case elfcpp::R_386_TLS_LE
: // Local-exec
1015 case elfcpp::R_386_TLS_LE_32
:
1017 bool output_is_shared
= parameters
->options().shared();
1018 const tls::Tls_optimization optimized_type
1019 = Target_i386::optimize_tls_reloc(!output_is_shared
, r_type
);
1022 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1023 if (optimized_type
== tls::TLSOPT_NONE
)
1025 // Create a pair of GOT entries for the module index and
1026 // dtv-relative offset.
1027 Output_data_got
<32, false>* got
1028 = target
->got_section(symtab
, layout
);
1029 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1030 unsigned int shndx
= lsym
.get_st_shndx();
1032 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
1034 object
->error(_("local symbol %u has bad shndx %u"),
1037 got
->add_local_pair_with_rel(object
, r_sym
, shndx
,
1039 target
->rel_dyn_section(layout
),
1040 elfcpp::R_386_TLS_DTPMOD32
, 0);
1042 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1043 unsupported_reloc_local(object
, r_type
);
1046 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva)
1047 target
->define_tls_base_symbol(symtab
, layout
);
1048 if (optimized_type
== tls::TLSOPT_NONE
)
1050 // Create a double GOT entry with an R_386_TLS_DESC reloc.
1051 Output_data_got
<32, false>* got
1052 = target
->got_section(symtab
, layout
);
1053 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1054 unsigned int shndx
= lsym
.get_st_shndx();
1056 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
1058 object
->error(_("local symbol %u has bad shndx %u"),
1061 got
->add_local_pair_with_rel(object
, r_sym
, shndx
,
1063 target
->rel_dyn_section(layout
),
1064 elfcpp::R_386_TLS_DESC
, 0);
1066 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1067 unsupported_reloc_local(object
, r_type
);
1070 case elfcpp::R_386_TLS_DESC_CALL
:
1073 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1074 if (optimized_type
== tls::TLSOPT_NONE
)
1076 // Create a GOT entry for the module index.
1077 target
->got_mod_index_entry(symtab
, layout
, object
);
1079 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1080 unsupported_reloc_local(object
, r_type
);
1083 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1086 case elfcpp::R_386_TLS_IE
: // Initial-exec
1087 case elfcpp::R_386_TLS_IE_32
:
1088 case elfcpp::R_386_TLS_GOTIE
:
1089 layout
->set_has_static_tls();
1090 if (optimized_type
== tls::TLSOPT_NONE
)
1092 // For the R_386_TLS_IE relocation, we need to create a
1093 // dynamic relocation when building a shared library.
1094 if (r_type
== elfcpp::R_386_TLS_IE
1095 && parameters
->options().shared())
1097 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1099 = elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1100 rel_dyn
->add_local_relative(object
, r_sym
,
1101 elfcpp::R_386_RELATIVE
,
1102 output_section
, data_shndx
,
1103 reloc
.get_r_offset());
1105 // Create a GOT entry for the tp-relative offset.
1106 Output_data_got
<32, false>* got
1107 = target
->got_section(symtab
, layout
);
1108 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1109 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_IE_32
1110 ? elfcpp::R_386_TLS_TPOFF32
1111 : elfcpp::R_386_TLS_TPOFF
);
1112 unsigned int got_type
= (r_type
== elfcpp::R_386_TLS_IE_32
1113 ? GOT_TYPE_TLS_OFFSET
1114 : GOT_TYPE_TLS_NOFFSET
);
1115 got
->add_local_with_rel(object
, r_sym
, got_type
,
1116 target
->rel_dyn_section(layout
),
1119 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1120 unsupported_reloc_local(object
, r_type
);
1123 case elfcpp::R_386_TLS_LE
: // Local-exec
1124 case elfcpp::R_386_TLS_LE_32
:
1125 layout
->set_has_static_tls();
1126 if (output_is_shared
)
1128 // We need to create a dynamic relocation.
1129 gold_assert(lsym
.get_st_type() != elfcpp::STT_SECTION
);
1130 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1131 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_LE_32
1132 ? elfcpp::R_386_TLS_TPOFF32
1133 : elfcpp::R_386_TLS_TPOFF
);
1134 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1135 rel_dyn
->add_local(object
, r_sym
, dyn_r_type
, output_section
,
1136 data_shndx
, reloc
.get_r_offset());
1146 case elfcpp::R_386_32PLT
:
1147 case elfcpp::R_386_TLS_GD_32
:
1148 case elfcpp::R_386_TLS_GD_PUSH
:
1149 case elfcpp::R_386_TLS_GD_CALL
:
1150 case elfcpp::R_386_TLS_GD_POP
:
1151 case elfcpp::R_386_TLS_LDM_32
:
1152 case elfcpp::R_386_TLS_LDM_PUSH
:
1153 case elfcpp::R_386_TLS_LDM_CALL
:
1154 case elfcpp::R_386_TLS_LDM_POP
:
1155 case elfcpp::R_386_USED_BY_INTEL_200
:
1157 unsupported_reloc_local(object
, r_type
);
1162 // Report an unsupported relocation against a global symbol.
1165 Target_i386::Scan::unsupported_reloc_global(Sized_relobj
<32, false>* object
,
1166 unsigned int r_type
,
1169 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1170 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
1173 // Scan a relocation for a global symbol.
1176 Target_i386::Scan::global(Symbol_table
* symtab
,
1178 Target_i386
* target
,
1179 Sized_relobj
<32, false>* object
,
1180 unsigned int data_shndx
,
1181 Output_section
* output_section
,
1182 const elfcpp::Rel
<32, false>& reloc
,
1183 unsigned int r_type
,
1188 case elfcpp::R_386_NONE
:
1189 case elfcpp::R_386_GNU_VTINHERIT
:
1190 case elfcpp::R_386_GNU_VTENTRY
:
1193 case elfcpp::R_386_32
:
1194 case elfcpp::R_386_16
:
1195 case elfcpp::R_386_8
:
1197 // Make a PLT entry if necessary.
1198 if (gsym
->needs_plt_entry())
1200 target
->make_plt_entry(symtab
, layout
, gsym
);
1201 // Since this is not a PC-relative relocation, we may be
1202 // taking the address of a function. In that case we need to
1203 // set the entry in the dynamic symbol table to the address of
1205 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
1206 gsym
->set_needs_dynsym_value();
1208 // Make a dynamic relocation if necessary.
1209 if (gsym
->needs_dynamic_reloc(Symbol::ABSOLUTE_REF
))
1211 if (gsym
->may_need_copy_reloc())
1213 target
->copy_reloc(symtab
, layout
, object
,
1214 data_shndx
, output_section
, gsym
, reloc
);
1216 else if (r_type
== elfcpp::R_386_32
1217 && gsym
->can_use_relative_reloc(false))
1219 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1220 rel_dyn
->add_global_relative(gsym
, elfcpp::R_386_RELATIVE
,
1221 output_section
, object
,
1222 data_shndx
, reloc
.get_r_offset());
1226 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1227 rel_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1228 data_shndx
, reloc
.get_r_offset());
1234 case elfcpp::R_386_PC32
:
1235 case elfcpp::R_386_PC16
:
1236 case elfcpp::R_386_PC8
:
1238 // Make a PLT entry if necessary.
1239 if (gsym
->needs_plt_entry())
1241 // These relocations are used for function calls only in
1242 // non-PIC code. For a 32-bit relocation in a shared library,
1243 // we'll need a text relocation anyway, so we can skip the
1244 // PLT entry and let the dynamic linker bind the call directly
1245 // to the target. For smaller relocations, we should use a
1246 // PLT entry to ensure that the call can reach.
1247 if (!parameters
->options().shared()
1248 || r_type
!= elfcpp::R_386_PC32
)
1249 target
->make_plt_entry(symtab
, layout
, gsym
);
1251 // Make a dynamic relocation if necessary.
1252 int flags
= Symbol::NON_PIC_REF
;
1253 if (gsym
->is_func())
1254 flags
|= Symbol::FUNCTION_CALL
;
1255 if (gsym
->needs_dynamic_reloc(flags
))
1257 if (gsym
->may_need_copy_reloc())
1259 target
->copy_reloc(symtab
, layout
, object
,
1260 data_shndx
, output_section
, gsym
, reloc
);
1264 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1265 rel_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1266 data_shndx
, reloc
.get_r_offset());
1272 case elfcpp::R_386_GOT32
:
1274 // The symbol requires a GOT entry.
1275 Output_data_got
<32, false>* got
= target
->got_section(symtab
, layout
);
1276 if (gsym
->final_value_is_known())
1277 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
1280 // If this symbol is not fully resolved, we need to add a
1281 // GOT entry with a dynamic relocation.
1282 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1283 if (gsym
->is_from_dynobj()
1284 || gsym
->is_undefined()
1285 || gsym
->is_preemptible())
1286 got
->add_global_with_rel(gsym
, GOT_TYPE_STANDARD
,
1287 rel_dyn
, elfcpp::R_386_GLOB_DAT
);
1290 if (got
->add_global(gsym
, GOT_TYPE_STANDARD
))
1291 rel_dyn
->add_global_relative(
1292 gsym
, elfcpp::R_386_RELATIVE
, got
,
1293 gsym
->got_offset(GOT_TYPE_STANDARD
));
1299 case elfcpp::R_386_PLT32
:
1300 // If the symbol is fully resolved, this is just a PC32 reloc.
1301 // Otherwise we need a PLT entry.
1302 if (gsym
->final_value_is_known())
1304 // If building a shared library, we can also skip the PLT entry
1305 // if the symbol is defined in the output file and is protected
1307 if (gsym
->is_defined()
1308 && !gsym
->is_from_dynobj()
1309 && !gsym
->is_preemptible())
1311 target
->make_plt_entry(symtab
, layout
, gsym
);
1314 case elfcpp::R_386_GOTOFF
:
1315 case elfcpp::R_386_GOTPC
:
1316 // We need a GOT section.
1317 target
->got_section(symtab
, layout
);
1320 // These are relocations which should only be seen by the
1321 // dynamic linker, and should never be seen here.
1322 case elfcpp::R_386_COPY
:
1323 case elfcpp::R_386_GLOB_DAT
:
1324 case elfcpp::R_386_JUMP_SLOT
:
1325 case elfcpp::R_386_RELATIVE
:
1326 case elfcpp::R_386_TLS_TPOFF
:
1327 case elfcpp::R_386_TLS_DTPMOD32
:
1328 case elfcpp::R_386_TLS_DTPOFF32
:
1329 case elfcpp::R_386_TLS_TPOFF32
:
1330 case elfcpp::R_386_TLS_DESC
:
1331 gold_error(_("%s: unexpected reloc %u in object file"),
1332 object
->name().c_str(), r_type
);
1335 // These are initial tls relocs, which are expected when
1337 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1338 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
1339 case elfcpp::R_386_TLS_DESC_CALL
:
1340 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1341 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1342 case elfcpp::R_386_TLS_IE
: // Initial-exec
1343 case elfcpp::R_386_TLS_IE_32
:
1344 case elfcpp::R_386_TLS_GOTIE
:
1345 case elfcpp::R_386_TLS_LE
: // Local-exec
1346 case elfcpp::R_386_TLS_LE_32
:
1348 const bool is_final
= gsym
->final_value_is_known();
1349 const tls::Tls_optimization optimized_type
1350 = Target_i386::optimize_tls_reloc(is_final
, r_type
);
1353 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1354 if (optimized_type
== tls::TLSOPT_NONE
)
1356 // Create a pair of GOT entries for the module index and
1357 // dtv-relative offset.
1358 Output_data_got
<32, false>* got
1359 = target
->got_section(symtab
, layout
);
1360 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_PAIR
,
1361 target
->rel_dyn_section(layout
),
1362 elfcpp::R_386_TLS_DTPMOD32
,
1363 elfcpp::R_386_TLS_DTPOFF32
);
1365 else if (optimized_type
== tls::TLSOPT_TO_IE
)
1367 // Create a GOT entry for the tp-relative offset.
1368 Output_data_got
<32, false>* got
1369 = target
->got_section(symtab
, layout
);
1370 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_NOFFSET
,
1371 target
->rel_dyn_section(layout
),
1372 elfcpp::R_386_TLS_TPOFF
);
1374 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1375 unsupported_reloc_global(object
, r_type
, gsym
);
1378 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (~oliva url)
1379 target
->define_tls_base_symbol(symtab
, layout
);
1380 if (optimized_type
== tls::TLSOPT_NONE
)
1382 // Create a double GOT entry with an R_386_TLS_DESC reloc.
1383 Output_data_got
<32, false>* got
1384 = target
->got_section(symtab
, layout
);
1385 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_DESC
,
1386 target
->rel_dyn_section(layout
),
1387 elfcpp::R_386_TLS_DESC
, 0);
1389 else if (optimized_type
== tls::TLSOPT_TO_IE
)
1391 // Create a GOT entry for the tp-relative offset.
1392 Output_data_got
<32, false>* got
1393 = target
->got_section(symtab
, layout
);
1394 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_NOFFSET
,
1395 target
->rel_dyn_section(layout
),
1396 elfcpp::R_386_TLS_TPOFF
);
1398 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1399 unsupported_reloc_global(object
, r_type
, gsym
);
1402 case elfcpp::R_386_TLS_DESC_CALL
:
1405 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1406 if (optimized_type
== tls::TLSOPT_NONE
)
1408 // Create a GOT entry for the module index.
1409 target
->got_mod_index_entry(symtab
, layout
, object
);
1411 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1412 unsupported_reloc_global(object
, r_type
, gsym
);
1415 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1418 case elfcpp::R_386_TLS_IE
: // Initial-exec
1419 case elfcpp::R_386_TLS_IE_32
:
1420 case elfcpp::R_386_TLS_GOTIE
:
1421 layout
->set_has_static_tls();
1422 if (optimized_type
== tls::TLSOPT_NONE
)
1424 // For the R_386_TLS_IE relocation, we need to create a
1425 // dynamic relocation when building a shared library.
1426 if (r_type
== elfcpp::R_386_TLS_IE
1427 && parameters
->options().shared())
1429 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1430 rel_dyn
->add_global_relative(gsym
, elfcpp::R_386_RELATIVE
,
1431 output_section
, object
,
1433 reloc
.get_r_offset());
1435 // Create a GOT entry for the tp-relative offset.
1436 Output_data_got
<32, false>* got
1437 = target
->got_section(symtab
, layout
);
1438 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_IE_32
1439 ? elfcpp::R_386_TLS_TPOFF32
1440 : elfcpp::R_386_TLS_TPOFF
);
1441 unsigned int got_type
= (r_type
== elfcpp::R_386_TLS_IE_32
1442 ? GOT_TYPE_TLS_OFFSET
1443 : GOT_TYPE_TLS_NOFFSET
);
1444 got
->add_global_with_rel(gsym
, got_type
,
1445 target
->rel_dyn_section(layout
),
1448 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1449 unsupported_reloc_global(object
, r_type
, gsym
);
1452 case elfcpp::R_386_TLS_LE
: // Local-exec
1453 case elfcpp::R_386_TLS_LE_32
:
1454 layout
->set_has_static_tls();
1455 if (parameters
->options().shared())
1457 // We need to create a dynamic relocation.
1458 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_LE_32
1459 ? elfcpp::R_386_TLS_TPOFF32
1460 : elfcpp::R_386_TLS_TPOFF
);
1461 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1462 rel_dyn
->add_global(gsym
, dyn_r_type
, output_section
, object
,
1463 data_shndx
, reloc
.get_r_offset());
1473 case elfcpp::R_386_32PLT
:
1474 case elfcpp::R_386_TLS_GD_32
:
1475 case elfcpp::R_386_TLS_GD_PUSH
:
1476 case elfcpp::R_386_TLS_GD_CALL
:
1477 case elfcpp::R_386_TLS_GD_POP
:
1478 case elfcpp::R_386_TLS_LDM_32
:
1479 case elfcpp::R_386_TLS_LDM_PUSH
:
1480 case elfcpp::R_386_TLS_LDM_CALL
:
1481 case elfcpp::R_386_TLS_LDM_POP
:
1482 case elfcpp::R_386_USED_BY_INTEL_200
:
1484 unsupported_reloc_global(object
, r_type
, gsym
);
1489 // Process relocations for gc.
1492 Target_i386::gc_process_relocs(Symbol_table
* symtab
,
1494 Sized_relobj
<32, false>* object
,
1495 unsigned int data_shndx
,
1497 const unsigned char* prelocs
,
1499 Output_section
* output_section
,
1500 bool needs_special_offset_handling
,
1501 size_t local_symbol_count
,
1502 const unsigned char* plocal_symbols
)
1504 gold::gc_process_relocs
<32, false, Target_i386
, elfcpp::SHT_REL
,
1514 needs_special_offset_handling
,
1519 // Scan relocations for a section.
1522 Target_i386::scan_relocs(Symbol_table
* symtab
,
1524 Sized_relobj
<32, false>* object
,
1525 unsigned int data_shndx
,
1526 unsigned int sh_type
,
1527 const unsigned char* prelocs
,
1529 Output_section
* output_section
,
1530 bool needs_special_offset_handling
,
1531 size_t local_symbol_count
,
1532 const unsigned char* plocal_symbols
)
1534 if (sh_type
== elfcpp::SHT_RELA
)
1536 gold_error(_("%s: unsupported RELA reloc section"),
1537 object
->name().c_str());
1541 gold::scan_relocs
<32, false, Target_i386
, elfcpp::SHT_REL
,
1551 needs_special_offset_handling
,
1556 // Finalize the sections.
1559 Target_i386::do_finalize_sections(
1561 const Input_objects
*,
1564 // Fill in some more dynamic tags.
1565 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
1568 if (this->got_plt_
!= NULL
1569 && this->got_plt_
->output_section() != NULL
)
1570 odyn
->add_section_address(elfcpp::DT_PLTGOT
, this->got_plt_
);
1572 if (this->plt_
!= NULL
1573 && this->plt_
->output_section() != NULL
)
1575 const Output_data
* od
= this->plt_
->rel_plt();
1576 odyn
->add_section_size(elfcpp::DT_PLTRELSZ
, od
);
1577 odyn
->add_section_address(elfcpp::DT_JMPREL
, od
);
1578 odyn
->add_constant(elfcpp::DT_PLTREL
, elfcpp::DT_REL
);
1581 if (this->rel_dyn_
!= NULL
1582 && this->rel_dyn_
->output_section() != NULL
)
1584 const Output_data
* od
= this->rel_dyn_
;
1585 odyn
->add_section_address(elfcpp::DT_REL
, od
);
1586 odyn
->add_section_size(elfcpp::DT_RELSZ
, od
);
1587 odyn
->add_constant(elfcpp::DT_RELENT
,
1588 elfcpp::Elf_sizes
<32>::rel_size
);
1591 if (!parameters
->options().shared())
1593 // The value of the DT_DEBUG tag is filled in by the dynamic
1594 // linker at run time, and used by the debugger.
1595 odyn
->add_constant(elfcpp::DT_DEBUG
, 0);
1599 // Emit any relocs we saved in an attempt to avoid generating COPY
1601 if (this->copy_relocs_
.any_saved_relocs())
1602 this->copy_relocs_
.emit(this->rel_dyn_section(layout
));
1605 // Return whether a direct absolute static relocation needs to be applied.
1606 // In cases where Scan::local() or Scan::global() has created
1607 // a dynamic relocation other than R_386_RELATIVE, the addend
1608 // of the relocation is carried in the data, and we must not
1609 // apply the static relocation.
1612 Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol
<32>* gsym
,
1615 Output_section
* output_section
)
1617 // If the output section is not allocated, then we didn't call
1618 // scan_relocs, we didn't create a dynamic reloc, and we must apply
1620 if ((output_section
->flags() & elfcpp::SHF_ALLOC
) == 0)
1623 // For local symbols, we will have created a non-RELATIVE dynamic
1624 // relocation only if (a) the output is position independent,
1625 // (b) the relocation is absolute (not pc- or segment-relative), and
1626 // (c) the relocation is not 32 bits wide.
1628 return !(parameters
->options().output_is_position_independent()
1629 && (ref_flags
& Symbol::ABSOLUTE_REF
)
1632 // For global symbols, we use the same helper routines used in the
1633 // scan pass. If we did not create a dynamic relocation, or if we
1634 // created a RELATIVE dynamic relocation, we should apply the static
1636 bool has_dyn
= gsym
->needs_dynamic_reloc(ref_flags
);
1637 bool is_rel
= (ref_flags
& Symbol::ABSOLUTE_REF
)
1638 && gsym
->can_use_relative_reloc(ref_flags
1639 & Symbol::FUNCTION_CALL
);
1640 return !has_dyn
|| is_rel
;
1643 // Perform a relocation.
1646 Target_i386::Relocate::relocate(const Relocate_info
<32, false>* relinfo
,
1647 Target_i386
* target
,
1648 Output_section
*output_section
,
1650 const elfcpp::Rel
<32, false>& rel
,
1651 unsigned int r_type
,
1652 const Sized_symbol
<32>* gsym
,
1653 const Symbol_value
<32>* psymval
,
1654 unsigned char* view
,
1655 elfcpp::Elf_types
<32>::Elf_Addr address
,
1656 section_size_type view_size
)
1658 if (this->skip_call_tls_get_addr_
)
1660 if ((r_type
!= elfcpp::R_386_PLT32
1661 && r_type
!= elfcpp::R_386_PC32
)
1663 || strcmp(gsym
->name(), "___tls_get_addr") != 0)
1664 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
1665 _("missing expected TLS relocation"));
1668 this->skip_call_tls_get_addr_
= false;
1673 // Pick the value to use for symbols defined in shared objects.
1674 Symbol_value
<32> symval
;
1676 && gsym
->use_plt_offset(r_type
== elfcpp::R_386_PC8
1677 || r_type
== elfcpp::R_386_PC16
1678 || r_type
== elfcpp::R_386_PC32
))
1680 symval
.set_output_value(target
->plt_section()->address()
1681 + gsym
->plt_offset());
1685 const Sized_relobj
<32, false>* object
= relinfo
->object
;
1687 // Get the GOT offset if needed.
1688 // The GOT pointer points to the end of the GOT section.
1689 // We need to subtract the size of the GOT section to get
1690 // the actual offset to use in the relocation.
1691 bool have_got_offset
= false;
1692 unsigned int got_offset
= 0;
1695 case elfcpp::R_386_GOT32
:
1698 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
1699 got_offset
= (gsym
->got_offset(GOT_TYPE_STANDARD
)
1700 - target
->got_size());
1704 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
1705 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
1706 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
1707 - target
->got_size());
1709 have_got_offset
= true;
1718 case elfcpp::R_386_NONE
:
1719 case elfcpp::R_386_GNU_VTINHERIT
:
1720 case elfcpp::R_386_GNU_VTENTRY
:
1723 case elfcpp::R_386_32
:
1724 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, true,
1726 Relocate_functions
<32, false>::rel32(view
, object
, psymval
);
1729 case elfcpp::R_386_PC32
:
1731 int ref_flags
= Symbol::NON_PIC_REF
;
1732 if (gsym
!= NULL
&& gsym
->is_func())
1733 ref_flags
|= Symbol::FUNCTION_CALL
;
1734 if (should_apply_static_reloc(gsym
, ref_flags
, true, output_section
))
1735 Relocate_functions
<32, false>::pcrel32(view
, object
, psymval
, address
);
1739 case elfcpp::R_386_16
:
1740 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, false,
1742 Relocate_functions
<32, false>::rel16(view
, object
, psymval
);
1745 case elfcpp::R_386_PC16
:
1747 int ref_flags
= Symbol::NON_PIC_REF
;
1748 if (gsym
!= NULL
&& gsym
->is_func())
1749 ref_flags
|= Symbol::FUNCTION_CALL
;
1750 if (should_apply_static_reloc(gsym
, ref_flags
, false, output_section
))
1751 Relocate_functions
<32, false>::pcrel16(view
, object
, psymval
, address
);
1755 case elfcpp::R_386_8
:
1756 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, false,
1758 Relocate_functions
<32, false>::rel8(view
, object
, psymval
);
1761 case elfcpp::R_386_PC8
:
1763 int ref_flags
= Symbol::NON_PIC_REF
;
1764 if (gsym
!= NULL
&& gsym
->is_func())
1765 ref_flags
|= Symbol::FUNCTION_CALL
;
1766 if (should_apply_static_reloc(gsym
, ref_flags
, false,
1768 Relocate_functions
<32, false>::pcrel8(view
, object
, psymval
, address
);
1772 case elfcpp::R_386_PLT32
:
1773 gold_assert(gsym
== NULL
1774 || gsym
->has_plt_offset()
1775 || gsym
->final_value_is_known()
1776 || (gsym
->is_defined()
1777 && !gsym
->is_from_dynobj()
1778 && !gsym
->is_preemptible()));
1779 Relocate_functions
<32, false>::pcrel32(view
, object
, psymval
, address
);
1782 case elfcpp::R_386_GOT32
:
1783 gold_assert(have_got_offset
);
1784 Relocate_functions
<32, false>::rel32(view
, got_offset
);
1787 case elfcpp::R_386_GOTOFF
:
1789 elfcpp::Elf_types
<32>::Elf_Addr value
;
1790 value
= (psymval
->value(object
, 0)
1791 - target
->got_plt_section()->address());
1792 Relocate_functions
<32, false>::rel32(view
, value
);
1796 case elfcpp::R_386_GOTPC
:
1798 elfcpp::Elf_types
<32>::Elf_Addr value
;
1799 value
= target
->got_plt_section()->address();
1800 Relocate_functions
<32, false>::pcrel32(view
, value
, address
);
1804 case elfcpp::R_386_COPY
:
1805 case elfcpp::R_386_GLOB_DAT
:
1806 case elfcpp::R_386_JUMP_SLOT
:
1807 case elfcpp::R_386_RELATIVE
:
1808 // These are outstanding tls relocs, which are unexpected when
1810 case elfcpp::R_386_TLS_TPOFF
:
1811 case elfcpp::R_386_TLS_DTPMOD32
:
1812 case elfcpp::R_386_TLS_DTPOFF32
:
1813 case elfcpp::R_386_TLS_TPOFF32
:
1814 case elfcpp::R_386_TLS_DESC
:
1815 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
1816 _("unexpected reloc %u in object file"),
1820 // These are initial tls relocs, which are expected when
1822 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1823 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
1824 case elfcpp::R_386_TLS_DESC_CALL
:
1825 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1826 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1827 case elfcpp::R_386_TLS_IE
: // Initial-exec
1828 case elfcpp::R_386_TLS_IE_32
:
1829 case elfcpp::R_386_TLS_GOTIE
:
1830 case elfcpp::R_386_TLS_LE
: // Local-exec
1831 case elfcpp::R_386_TLS_LE_32
:
1832 this->relocate_tls(relinfo
, target
, relnum
, rel
, r_type
, gsym
, psymval
,
1833 view
, address
, view_size
);
1836 case elfcpp::R_386_32PLT
:
1837 case elfcpp::R_386_TLS_GD_32
:
1838 case elfcpp::R_386_TLS_GD_PUSH
:
1839 case elfcpp::R_386_TLS_GD_CALL
:
1840 case elfcpp::R_386_TLS_GD_POP
:
1841 case elfcpp::R_386_TLS_LDM_32
:
1842 case elfcpp::R_386_TLS_LDM_PUSH
:
1843 case elfcpp::R_386_TLS_LDM_CALL
:
1844 case elfcpp::R_386_TLS_LDM_POP
:
1845 case elfcpp::R_386_USED_BY_INTEL_200
:
1847 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
1848 _("unsupported reloc %u"),
1856 // Perform a TLS relocation.
1859 Target_i386::Relocate::relocate_tls(const Relocate_info
<32, false>* relinfo
,
1860 Target_i386
* target
,
1862 const elfcpp::Rel
<32, false>& rel
,
1863 unsigned int r_type
,
1864 const Sized_symbol
<32>* gsym
,
1865 const Symbol_value
<32>* psymval
,
1866 unsigned char* view
,
1867 elfcpp::Elf_types
<32>::Elf_Addr
,
1868 section_size_type view_size
)
1870 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
1872 const Sized_relobj
<32, false>* object
= relinfo
->object
;
1874 elfcpp::Elf_types
<32>::Elf_Addr value
= psymval
->value(object
, 0);
1876 const bool is_final
=
1878 ? !parameters
->options().output_is_position_independent()
1879 : gsym
->final_value_is_known());
1880 const tls::Tls_optimization optimized_type
1881 = Target_i386::optimize_tls_reloc(is_final
, r_type
);
1884 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1885 if (optimized_type
== tls::TLSOPT_TO_LE
)
1887 gold_assert(tls_segment
!= NULL
);
1888 this->tls_gd_to_le(relinfo
, relnum
, tls_segment
,
1889 rel
, r_type
, value
, view
,
1895 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
1896 ? GOT_TYPE_TLS_NOFFSET
1897 : GOT_TYPE_TLS_PAIR
);
1898 unsigned int got_offset
;
1901 gold_assert(gsym
->has_got_offset(got_type
));
1902 got_offset
= gsym
->got_offset(got_type
) - target
->got_size();
1906 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
1907 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
1908 got_offset
= (object
->local_got_offset(r_sym
, got_type
)
1909 - target
->got_size());
1911 if (optimized_type
== tls::TLSOPT_TO_IE
)
1913 gold_assert(tls_segment
!= NULL
);
1914 this->tls_gd_to_ie(relinfo
, relnum
, tls_segment
, rel
, r_type
,
1915 got_offset
, view
, view_size
);
1918 else if (optimized_type
== tls::TLSOPT_NONE
)
1920 // Relocate the field with the offset of the pair of GOT
1922 Relocate_functions
<32, false>::rel32(view
, got_offset
);
1926 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
1927 _("unsupported reloc %u"),
1931 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
1932 case elfcpp::R_386_TLS_DESC_CALL
:
1933 this->local_dynamic_type_
= LOCAL_DYNAMIC_GNU
;
1934 if (optimized_type
== tls::TLSOPT_TO_LE
)
1936 gold_assert(tls_segment
!= NULL
);
1937 this->tls_desc_gd_to_le(relinfo
, relnum
, tls_segment
,
1938 rel
, r_type
, value
, view
,
1944 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
1945 ? GOT_TYPE_TLS_NOFFSET
1946 : GOT_TYPE_TLS_DESC
);
1947 unsigned int got_offset
;
1950 gold_assert(gsym
->has_got_offset(got_type
));
1951 got_offset
= gsym
->got_offset(got_type
) - target
->got_size();
1955 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
1956 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
1957 got_offset
= (object
->local_got_offset(r_sym
, got_type
)
1958 - target
->got_size());
1960 if (optimized_type
== tls::TLSOPT_TO_IE
)
1962 gold_assert(tls_segment
!= NULL
);
1963 this->tls_desc_gd_to_ie(relinfo
, relnum
, tls_segment
, rel
, r_type
,
1964 got_offset
, view
, view_size
);
1967 else if (optimized_type
== tls::TLSOPT_NONE
)
1969 if (r_type
== elfcpp::R_386_TLS_GOTDESC
)
1971 // Relocate the field with the offset of the pair of GOT
1973 Relocate_functions
<32, false>::rel32(view
, got_offset
);
1978 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
1979 _("unsupported reloc %u"),
1983 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1984 if (this->local_dynamic_type_
== LOCAL_DYNAMIC_SUN
)
1986 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
1987 _("both SUN and GNU model "
1988 "TLS relocations"));
1991 this->local_dynamic_type_
= LOCAL_DYNAMIC_GNU
;
1992 if (optimized_type
== tls::TLSOPT_TO_LE
)
1994 gold_assert(tls_segment
!= NULL
);
1995 this->tls_ld_to_le(relinfo
, relnum
, tls_segment
, rel
, r_type
,
1996 value
, view
, view_size
);
1999 else if (optimized_type
== tls::TLSOPT_NONE
)
2001 // Relocate the field with the offset of the GOT entry for
2002 // the module index.
2003 unsigned int got_offset
;
2004 got_offset
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
)
2005 - target
->got_size());
2006 Relocate_functions
<32, false>::rel32(view
, got_offset
);
2009 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2010 _("unsupported reloc %u"),
2014 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
2015 if (optimized_type
== tls::TLSOPT_TO_LE
)
2017 // This reloc can appear in debugging sections, in which
2018 // case we must not convert to local-exec. We decide what
2019 // to do based on whether the section is marked as
2020 // containing executable code. That is what the GNU linker
2022 elfcpp::Shdr
<32, false> shdr(relinfo
->data_shdr
);
2023 if ((shdr
.get_sh_flags() & elfcpp::SHF_EXECINSTR
) != 0)
2025 gold_assert(tls_segment
!= NULL
);
2026 value
-= tls_segment
->memsz();
2029 Relocate_functions
<32, false>::rel32(view
, value
);
2032 case elfcpp::R_386_TLS_IE
: // Initial-exec
2033 case elfcpp::R_386_TLS_GOTIE
:
2034 case elfcpp::R_386_TLS_IE_32
:
2035 if (optimized_type
== tls::TLSOPT_TO_LE
)
2037 gold_assert(tls_segment
!= NULL
);
2038 Target_i386::Relocate::tls_ie_to_le(relinfo
, relnum
, tls_segment
,
2039 rel
, r_type
, value
, view
,
2043 else if (optimized_type
== tls::TLSOPT_NONE
)
2045 // Relocate the field with the offset of the GOT entry for
2046 // the tp-relative offset of the symbol.
2047 unsigned int got_type
= (r_type
== elfcpp::R_386_TLS_IE_32
2048 ? GOT_TYPE_TLS_OFFSET
2049 : GOT_TYPE_TLS_NOFFSET
);
2050 unsigned int got_offset
;
2053 gold_assert(gsym
->has_got_offset(got_type
));
2054 got_offset
= gsym
->got_offset(got_type
);
2058 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
2059 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
2060 got_offset
= object
->local_got_offset(r_sym
, got_type
);
2062 // For the R_386_TLS_IE relocation, we need to apply the
2063 // absolute address of the GOT entry.
2064 if (r_type
== elfcpp::R_386_TLS_IE
)
2065 got_offset
+= target
->got_plt_section()->address();
2066 // All GOT offsets are relative to the end of the GOT.
2067 got_offset
-= target
->got_size();
2068 Relocate_functions
<32, false>::rel32(view
, got_offset
);
2071 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2072 _("unsupported reloc %u"),
2076 case elfcpp::R_386_TLS_LE
: // Local-exec
2077 // If we're creating a shared library, a dynamic relocation will
2078 // have been created for this location, so do not apply it now.
2079 if (!parameters
->options().shared())
2081 gold_assert(tls_segment
!= NULL
);
2082 value
-= tls_segment
->memsz();
2083 Relocate_functions
<32, false>::rel32(view
, value
);
2087 case elfcpp::R_386_TLS_LE_32
:
2088 // If we're creating a shared library, a dynamic relocation will
2089 // have been created for this location, so do not apply it now.
2090 if (!parameters
->options().shared())
2092 gold_assert(tls_segment
!= NULL
);
2093 value
= tls_segment
->memsz() - value
;
2094 Relocate_functions
<32, false>::rel32(view
, value
);
2100 // Do a relocation in which we convert a TLS General-Dynamic to a
2104 Target_i386::Relocate::tls_gd_to_le(const Relocate_info
<32, false>* relinfo
,
2106 Output_segment
* tls_segment
,
2107 const elfcpp::Rel
<32, false>& rel
,
2109 elfcpp::Elf_types
<32>::Elf_Addr value
,
2110 unsigned char* view
,
2111 section_size_type view_size
)
2113 // leal foo(,%reg,1),%eax; call ___tls_get_addr
2114 // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
2115 // leal foo(%reg),%eax; call ___tls_get_addr
2116 // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
2118 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2119 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 9);
2121 unsigned char op1
= view
[-1];
2122 unsigned char op2
= view
[-2];
2124 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2125 op2
== 0x8d || op2
== 0x04);
2126 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[4] == 0xe8);
2132 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -3);
2133 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[-3] == 0x8d);
2134 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2135 ((op1
& 0xc7) == 0x05 && op1
!= (4 << 3)));
2136 memcpy(view
- 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2140 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2141 (op1
& 0xf8) == 0x80 && (op1
& 7) != 4);
2142 if (rel
.get_r_offset() + 9 < view_size
2145 // There is a trailing nop. Use the size byte subl.
2146 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2151 // Use the five byte subl.
2152 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2156 value
= tls_segment
->memsz() - value
;
2157 Relocate_functions
<32, false>::rel32(view
+ roff
, value
);
2159 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2161 this->skip_call_tls_get_addr_
= true;
2164 // Do a relocation in which we convert a TLS General-Dynamic to an
2168 Target_i386::Relocate::tls_gd_to_ie(const Relocate_info
<32, false>* relinfo
,
2171 const elfcpp::Rel
<32, false>& rel
,
2173 elfcpp::Elf_types
<32>::Elf_Addr value
,
2174 unsigned char* view
,
2175 section_size_type view_size
)
2177 // leal foo(,%ebx,1),%eax; call ___tls_get_addr
2178 // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax
2180 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2181 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 9);
2183 unsigned char op1
= view
[-1];
2184 unsigned char op2
= view
[-2];
2186 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2187 op2
== 0x8d || op2
== 0x04);
2188 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[4] == 0xe8);
2192 // FIXME: For now, support only the first (SIB) form.
2193 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), op2
== 0x04);
2197 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -3);
2198 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[-3] == 0x8d);
2199 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2200 ((op1
& 0xc7) == 0x05 && op1
!= (4 << 3)));
2201 memcpy(view
- 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12);
2205 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2206 (op1
& 0xf8) == 0x80 && (op1
& 7) != 4);
2207 if (rel
.get_r_offset() + 9 < view_size
2210 // FIXME: This is not the right instruction sequence.
2211 // There is a trailing nop. Use the size byte subl.
2212 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2217 // FIXME: This is not the right instruction sequence.
2218 // Use the five byte subl.
2219 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2223 Relocate_functions
<32, false>::rel32(view
+ roff
, value
);
2225 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2227 this->skip_call_tls_get_addr_
= true;
2230 // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL
2231 // General-Dynamic to a Local-Exec.
2234 Target_i386::Relocate::tls_desc_gd_to_le(
2235 const Relocate_info
<32, false>* relinfo
,
2237 Output_segment
* tls_segment
,
2238 const elfcpp::Rel
<32, false>& rel
,
2239 unsigned int r_type
,
2240 elfcpp::Elf_types
<32>::Elf_Addr value
,
2241 unsigned char* view
,
2242 section_size_type view_size
)
2244 if (r_type
== elfcpp::R_386_TLS_GOTDESC
)
2246 // leal foo@TLSDESC(%ebx), %eax
2247 // ==> leal foo@NTPOFF, %eax
2248 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2249 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
2250 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2251 view
[-2] == 0x8d && view
[-1] == 0x83);
2253 value
-= tls_segment
->memsz();
2254 Relocate_functions
<32, false>::rel32(view
, value
);
2258 // call *foo@TLSCALL(%eax)
2260 gold_assert(r_type
== elfcpp::R_386_TLS_DESC_CALL
);
2261 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 2);
2262 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2263 view
[0] == 0xff && view
[1] == 0x10);
2269 // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL
2270 // General-Dynamic to an Initial-Exec.
2273 Target_i386::Relocate::tls_desc_gd_to_ie(
2274 const Relocate_info
<32, false>* relinfo
,
2277 const elfcpp::Rel
<32, false>& rel
,
2278 unsigned int r_type
,
2279 elfcpp::Elf_types
<32>::Elf_Addr value
,
2280 unsigned char* view
,
2281 section_size_type view_size
)
2283 if (r_type
== elfcpp::R_386_TLS_GOTDESC
)
2285 // leal foo@TLSDESC(%ebx), %eax
2286 // ==> movl foo@GOTNTPOFF(%ebx), %eax
2287 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2288 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
2289 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2290 view
[-2] == 0x8d && view
[-1] == 0x83);
2292 Relocate_functions
<32, false>::rel32(view
, value
);
2296 // call *foo@TLSCALL(%eax)
2298 gold_assert(r_type
== elfcpp::R_386_TLS_DESC_CALL
);
2299 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 2);
2300 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2301 view
[0] == 0xff && view
[1] == 0x10);
2307 // Do a relocation in which we convert a TLS Local-Dynamic to a
2311 Target_i386::Relocate::tls_ld_to_le(const Relocate_info
<32, false>* relinfo
,
2314 const elfcpp::Rel
<32, false>& rel
,
2316 elfcpp::Elf_types
<32>::Elf_Addr
,
2317 unsigned char* view
,
2318 section_size_type view_size
)
2320 // leal foo(%reg), %eax; call ___tls_get_addr
2321 // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi
2323 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2324 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 9);
2326 // FIXME: Does this test really always pass?
2327 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2328 view
[-2] == 0x8d && view
[-1] == 0x83);
2330 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[4] == 0xe8);
2332 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11);
2334 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2336 this->skip_call_tls_get_addr_
= true;
2339 // Do a relocation in which we convert a TLS Initial-Exec to a
2343 Target_i386::Relocate::tls_ie_to_le(const Relocate_info
<32, false>* relinfo
,
2345 Output_segment
* tls_segment
,
2346 const elfcpp::Rel
<32, false>& rel
,
2347 unsigned int r_type
,
2348 elfcpp::Elf_types
<32>::Elf_Addr value
,
2349 unsigned char* view
,
2350 section_size_type view_size
)
2352 // We have to actually change the instructions, which means that we
2353 // need to examine the opcodes to figure out which instruction we
2355 if (r_type
== elfcpp::R_386_TLS_IE
)
2357 // movl %gs:XX,%eax ==> movl $YY,%eax
2358 // movl %gs:XX,%reg ==> movl $YY,%reg
2359 // addl %gs:XX,%reg ==> addl $YY,%reg
2360 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -1);
2361 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
2363 unsigned char op1
= view
[-1];
2366 // movl XX,%eax ==> movl $YY,%eax
2371 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2373 unsigned char op2
= view
[-2];
2376 // movl XX,%reg ==> movl $YY,%reg
2377 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2378 (op1
& 0xc7) == 0x05);
2380 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
2382 else if (op2
== 0x03)
2384 // addl XX,%reg ==> addl $YY,%reg
2385 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2386 (op1
& 0xc7) == 0x05);
2388 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
2391 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), 0);
2396 // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
2397 // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
2398 // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
2399 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2400 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
2402 unsigned char op1
= view
[-1];
2403 unsigned char op2
= view
[-2];
2404 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2405 (op1
& 0xc0) == 0x80 && (op1
& 7) != 4);
2408 // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
2410 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
2412 else if (op2
== 0x2b)
2414 // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
2416 view
[-1] = 0xe8 | ((op1
>> 3) & 7);
2418 else if (op2
== 0x03)
2420 // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
2422 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
2425 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), 0);
2428 value
= tls_segment
->memsz() - value
;
2429 if (r_type
== elfcpp::R_386_TLS_IE
|| r_type
== elfcpp::R_386_TLS_GOTIE
)
2432 Relocate_functions
<32, false>::rel32(view
, value
);
2435 // Relocate section data.
2438 Target_i386::relocate_section(const Relocate_info
<32, false>* relinfo
,
2439 unsigned int sh_type
,
2440 const unsigned char* prelocs
,
2442 Output_section
* output_section
,
2443 bool needs_special_offset_handling
,
2444 unsigned char* view
,
2445 elfcpp::Elf_types
<32>::Elf_Addr address
,
2446 section_size_type view_size
,
2447 const Reloc_symbol_changes
* reloc_symbol_changes
)
2449 gold_assert(sh_type
== elfcpp::SHT_REL
);
2451 gold::relocate_section
<32, false, Target_i386
, elfcpp::SHT_REL
,
2452 Target_i386::Relocate
>(
2458 needs_special_offset_handling
,
2462 reloc_symbol_changes
);
2465 // Return the size of a relocation while scanning during a relocatable
2469 Target_i386::Relocatable_size_for_reloc::get_size_for_reloc(
2470 unsigned int r_type
,
2475 case elfcpp::R_386_NONE
:
2476 case elfcpp::R_386_GNU_VTINHERIT
:
2477 case elfcpp::R_386_GNU_VTENTRY
:
2478 case elfcpp::R_386_TLS_GD
: // Global-dynamic
2479 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
2480 case elfcpp::R_386_TLS_DESC_CALL
:
2481 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
2482 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
2483 case elfcpp::R_386_TLS_IE
: // Initial-exec
2484 case elfcpp::R_386_TLS_IE_32
:
2485 case elfcpp::R_386_TLS_GOTIE
:
2486 case elfcpp::R_386_TLS_LE
: // Local-exec
2487 case elfcpp::R_386_TLS_LE_32
:
2490 case elfcpp::R_386_32
:
2491 case elfcpp::R_386_PC32
:
2492 case elfcpp::R_386_GOT32
:
2493 case elfcpp::R_386_PLT32
:
2494 case elfcpp::R_386_GOTOFF
:
2495 case elfcpp::R_386_GOTPC
:
2498 case elfcpp::R_386_16
:
2499 case elfcpp::R_386_PC16
:
2502 case elfcpp::R_386_8
:
2503 case elfcpp::R_386_PC8
:
2506 // These are relocations which should only be seen by the
2507 // dynamic linker, and should never be seen here.
2508 case elfcpp::R_386_COPY
:
2509 case elfcpp::R_386_GLOB_DAT
:
2510 case elfcpp::R_386_JUMP_SLOT
:
2511 case elfcpp::R_386_RELATIVE
:
2512 case elfcpp::R_386_TLS_TPOFF
:
2513 case elfcpp::R_386_TLS_DTPMOD32
:
2514 case elfcpp::R_386_TLS_DTPOFF32
:
2515 case elfcpp::R_386_TLS_TPOFF32
:
2516 case elfcpp::R_386_TLS_DESC
:
2517 object
->error(_("unexpected reloc %u in object file"), r_type
);
2520 case elfcpp::R_386_32PLT
:
2521 case elfcpp::R_386_TLS_GD_32
:
2522 case elfcpp::R_386_TLS_GD_PUSH
:
2523 case elfcpp::R_386_TLS_GD_CALL
:
2524 case elfcpp::R_386_TLS_GD_POP
:
2525 case elfcpp::R_386_TLS_LDM_32
:
2526 case elfcpp::R_386_TLS_LDM_PUSH
:
2527 case elfcpp::R_386_TLS_LDM_CALL
:
2528 case elfcpp::R_386_TLS_LDM_POP
:
2529 case elfcpp::R_386_USED_BY_INTEL_200
:
2531 object
->error(_("unsupported reloc %u in object file"), r_type
);
2536 // Scan the relocs during a relocatable link.
2539 Target_i386::scan_relocatable_relocs(Symbol_table
* symtab
,
2541 Sized_relobj
<32, false>* object
,
2542 unsigned int data_shndx
,
2543 unsigned int sh_type
,
2544 const unsigned char* prelocs
,
2546 Output_section
* output_section
,
2547 bool needs_special_offset_handling
,
2548 size_t local_symbol_count
,
2549 const unsigned char* plocal_symbols
,
2550 Relocatable_relocs
* rr
)
2552 gold_assert(sh_type
== elfcpp::SHT_REL
);
2554 typedef gold::Default_scan_relocatable_relocs
<elfcpp::SHT_REL
,
2555 Relocatable_size_for_reloc
> Scan_relocatable_relocs
;
2557 gold::scan_relocatable_relocs
<32, false, elfcpp::SHT_REL
,
2558 Scan_relocatable_relocs
>(
2566 needs_special_offset_handling
,
2572 // Relocate a section during a relocatable link.
2575 Target_i386::relocate_for_relocatable(
2576 const Relocate_info
<32, false>* relinfo
,
2577 unsigned int sh_type
,
2578 const unsigned char* prelocs
,
2580 Output_section
* output_section
,
2581 off_t offset_in_output_section
,
2582 const Relocatable_relocs
* rr
,
2583 unsigned char* view
,
2584 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
2585 section_size_type view_size
,
2586 unsigned char* reloc_view
,
2587 section_size_type reloc_view_size
)
2589 gold_assert(sh_type
== elfcpp::SHT_REL
);
2591 gold::relocate_for_relocatable
<32, false, elfcpp::SHT_REL
>(
2596 offset_in_output_section
,
2605 // Return the value to use for a dynamic which requires special
2606 // treatment. This is how we support equality comparisons of function
2607 // pointers across shared library boundaries, as described in the
2608 // processor specific ABI supplement.
2611 Target_i386::do_dynsym_value(const Symbol
* gsym
) const
2613 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
2614 return this->plt_section()->address() + gsym
->plt_offset();
2617 // Return a string used to fill a code section with nops to take up
2618 // the specified length.
2621 Target_i386::do_code_fill(section_size_type length
) const
2625 // Build a jmp instruction to skip over the bytes.
2626 unsigned char jmp
[5];
2628 elfcpp::Swap_unaligned
<32, false>::writeval(jmp
+ 1, length
- 5);
2629 return (std::string(reinterpret_cast<char*>(&jmp
[0]), 5)
2630 + std::string(length
- 5, '\0'));
2633 // Nop sequences of various lengths.
2634 const char nop1
[1] = { 0x90 }; // nop
2635 const char nop2
[2] = { 0x66, 0x90 }; // xchg %ax %ax
2636 const char nop3
[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi
2637 const char nop4
[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi
2638 const char nop5
[5] = { 0x90, 0x8d, 0x74, 0x26, // nop
2639 0x00 }; // leal 0(%esi,1),%esi
2640 const char nop6
[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
2642 const char nop7
[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
2644 const char nop8
[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop
2645 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi
2646 const char nop9
[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi
2647 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi
2649 const char nop10
[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi
2650 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi
2652 const char nop11
[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi
2653 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi
2655 const char nop12
[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
2656 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi
2657 0x00, 0x00, 0x00, 0x00 };
2658 const char nop13
[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
2659 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi
2660 0x27, 0x00, 0x00, 0x00,
2662 const char nop14
[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
2663 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi
2664 0xbc, 0x27, 0x00, 0x00,
2666 const char nop15
[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15
2667 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,...
2668 0x90, 0x90, 0x90, 0x90,
2671 const char* nops
[16] = {
2673 nop1
, nop2
, nop3
, nop4
, nop5
, nop6
, nop7
,
2674 nop8
, nop9
, nop10
, nop11
, nop12
, nop13
, nop14
, nop15
2677 return std::string(nops
[length
], length
);
2680 // FNOFFSET in section SHNDX in OBJECT is the start of a function
2681 // compiled with -fstack-split. The function calls non-stack-split
2682 // code. We have to change the function so that it always ensures
2683 // that it has enough stack space to run some random function.
2686 Target_i386::do_calls_non_split(Relobj
* object
, unsigned int shndx
,
2687 section_offset_type fnoffset
,
2688 section_size_type fnsize
,
2689 unsigned char* view
,
2690 section_size_type view_size
,
2692 std::string
* to
) const
2694 // The function starts with a comparison of the stack pointer and a
2695 // field in the TCB. This is followed by a jump.
2698 if (this->match_view(view
, view_size
, fnoffset
, "\x65\x3b\x25", 3)
2701 // We will call __morestack if the carry flag is set after this
2702 // comparison. We turn the comparison into an stc instruction
2704 view
[fnoffset
] = '\xf9';
2705 this->set_view_to_nop(view
, view_size
, fnoffset
+ 1, 6);
2707 // lea NN(%esp),%ecx
2708 // lea NN(%esp),%edx
2709 else if ((this->match_view(view
, view_size
, fnoffset
, "\x8d\x8c\x24", 3)
2710 || this->match_view(view
, view_size
, fnoffset
, "\x8d\x94\x24", 3))
2713 // This is loading an offset from the stack pointer for a
2714 // comparison. The offset is negative, so we decrease the
2715 // offset by the amount of space we need for the stack. This
2716 // means we will avoid calling __morestack if there happens to
2717 // be plenty of space on the stack already.
2718 unsigned char* pval
= view
+ fnoffset
+ 3;
2719 uint32_t val
= elfcpp::Swap_unaligned
<32, false>::readval(pval
);
2720 val
-= parameters
->options().split_stack_adjust_size();
2721 elfcpp::Swap_unaligned
<32, false>::writeval(pval
, val
);
2725 if (!object
->has_no_split_stack())
2726 object
->error(_("failed to match split-stack sequence at "
2727 "section %u offset %0zx"),
2728 shndx
, static_cast<size_t>(fnoffset
));
2732 // We have to change the function so that it calls
2733 // __morestack_non_split instead of __morestack. The former will
2734 // allocate additional stack space.
2735 *from
= "__morestack";
2736 *to
= "__morestack_non_split";
2739 // The selector for i386 object files.
2741 class Target_selector_i386
: public Target_selector_freebsd
2744 Target_selector_i386()
2745 : Target_selector_freebsd(elfcpp::EM_386
, 32, false,
2746 "elf32-i386", "elf32-i386-freebsd")
2750 do_instantiate_target()
2751 { return new Target_i386(); }
2754 Target_selector_i386 target_selector_i386
;
2756 } // End anonymous namespace.