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"
47 class Output_data_plt_i386
;
49 // The i386 target class.
50 // TLS info comes from
51 // http://people.redhat.com/drepper/tls.pdf
52 // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
54 class Target_i386
: public Target_freebsd
<32, false>
57 typedef Output_data_reloc
<elfcpp::SHT_REL
, true, 32, false> Reloc_section
;
60 : Target_freebsd
<32, false>(&i386_info
),
61 got_(NULL
), plt_(NULL
), got_plt_(NULL
), rel_dyn_(NULL
),
62 copy_relocs_(elfcpp::R_386_COPY
), dynbss_(NULL
),
63 got_mod_index_offset_(-1U), tls_base_symbol_defined_(false)
66 // Process the relocations to determine unreferenced sections for
67 // garbage collection.
69 gc_process_relocs(const General_options
& options
,
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(const General_options
& options
,
87 Sized_relobj
<32, false>* object
,
88 unsigned int data_shndx
,
90 const unsigned char* prelocs
,
92 Output_section
* output_section
,
93 bool needs_special_offset_handling
,
94 size_t local_symbol_count
,
95 const unsigned char* plocal_symbols
);
97 // Finalize the sections.
99 do_finalize_sections(Layout
*);
101 // Return the value to use for a dynamic which requires special
104 do_dynsym_value(const Symbol
*) const;
106 // Relocate a section.
108 relocate_section(const Relocate_info
<32, false>*,
109 unsigned int sh_type
,
110 const unsigned char* prelocs
,
112 Output_section
* output_section
,
113 bool needs_special_offset_handling
,
115 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
116 section_size_type view_size
);
118 // Scan the relocs during a relocatable link.
120 scan_relocatable_relocs(const General_options
& options
,
121 Symbol_table
* symtab
,
123 Sized_relobj
<32, false>* object
,
124 unsigned int data_shndx
,
125 unsigned int sh_type
,
126 const unsigned char* prelocs
,
128 Output_section
* output_section
,
129 bool needs_special_offset_handling
,
130 size_t local_symbol_count
,
131 const unsigned char* plocal_symbols
,
132 Relocatable_relocs
*);
134 // Relocate a section during a relocatable link.
136 relocate_for_relocatable(const Relocate_info
<32, false>*,
137 unsigned int sh_type
,
138 const unsigned char* prelocs
,
140 Output_section
* output_section
,
141 off_t offset_in_output_section
,
142 const Relocatable_relocs
*,
144 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
145 section_size_type view_size
,
146 unsigned char* reloc_view
,
147 section_size_type reloc_view_size
);
149 // Return a string used to fill a code section with nops.
151 do_code_fill(section_size_type length
) const;
153 // Return whether SYM is defined by the ABI.
155 do_is_defined_by_abi(const Symbol
* sym
) const
156 { return strcmp(sym
->name(), "___tls_get_addr") == 0; }
158 // Return whether a symbol name implies a local label. The UnixWare
159 // 2.1 cc generates temporary symbols that start with .X, so we
160 // recognize them here. FIXME: do other SVR4 compilers also use .X?.
161 // If so, we should move the .X recognition into
162 // Target::do_is_local_label_name.
164 do_is_local_label_name(const char* name
) const
166 if (name
[0] == '.' && name
[1] == 'X')
168 return Target::do_is_local_label_name(name
);
171 // Return the size of the GOT section.
175 gold_assert(this->got_
!= NULL
);
176 return this->got_
->data_size();
180 // The class which scans relocations.
184 local(const General_options
& options
, Symbol_table
* symtab
,
185 Layout
* layout
, Target_i386
* target
,
186 Sized_relobj
<32, false>* object
,
187 unsigned int data_shndx
,
188 Output_section
* output_section
,
189 const elfcpp::Rel
<32, false>& reloc
, unsigned int r_type
,
190 const elfcpp::Sym
<32, false>& lsym
);
193 global(const General_options
& options
, Symbol_table
* symtab
,
194 Layout
* layout
, Target_i386
* target
,
195 Sized_relobj
<32, false>* object
,
196 unsigned int data_shndx
,
197 Output_section
* output_section
,
198 const elfcpp::Rel
<32, false>& reloc
, unsigned int r_type
,
202 unsupported_reloc_local(Sized_relobj
<32, false>*, unsigned int r_type
);
205 unsupported_reloc_global(Sized_relobj
<32, false>*, unsigned int r_type
,
209 // The class which implements relocation.
214 : skip_call_tls_get_addr_(false),
215 local_dynamic_type_(LOCAL_DYNAMIC_NONE
), ldo_addrs_()
220 if (this->skip_call_tls_get_addr_
)
222 // FIXME: This needs to specify the location somehow.
223 gold_error(_("missing expected TLS relocation"));
227 // Return whether the static relocation needs to be applied.
229 should_apply_static_reloc(const Sized_symbol
<32>* gsym
,
232 Output_section
* output_section
);
234 // Do a relocation. Return false if the caller should not issue
235 // any warnings about this relocation.
237 relocate(const Relocate_info
<32, false>*, Target_i386
*, Output_section
*,
238 size_t relnum
, const elfcpp::Rel
<32, false>&,
239 unsigned int r_type
, const Sized_symbol
<32>*,
240 const Symbol_value
<32>*,
241 unsigned char*, elfcpp::Elf_types
<32>::Elf_Addr
,
245 // Do a TLS relocation.
247 relocate_tls(const Relocate_info
<32, false>*, Target_i386
* target
,
248 size_t relnum
, const elfcpp::Rel
<32, false>&,
249 unsigned int r_type
, const Sized_symbol
<32>*,
250 const Symbol_value
<32>*,
251 unsigned char*, elfcpp::Elf_types
<32>::Elf_Addr
,
254 // Do a TLS General-Dynamic to Initial-Exec transition.
256 tls_gd_to_ie(const Relocate_info
<32, false>*, size_t relnum
,
257 Output_segment
* tls_segment
,
258 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
259 elfcpp::Elf_types
<32>::Elf_Addr value
,
261 section_size_type view_size
);
263 // Do a TLS General-Dynamic to Local-Exec transition.
265 tls_gd_to_le(const Relocate_info
<32, false>*, size_t relnum
,
266 Output_segment
* tls_segment
,
267 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
268 elfcpp::Elf_types
<32>::Elf_Addr value
,
270 section_size_type view_size
);
272 // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec
275 tls_desc_gd_to_ie(const Relocate_info
<32, false>*, size_t relnum
,
276 Output_segment
* tls_segment
,
277 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
278 elfcpp::Elf_types
<32>::Elf_Addr value
,
280 section_size_type view_size
);
282 // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec
285 tls_desc_gd_to_le(const Relocate_info
<32, false>*, size_t relnum
,
286 Output_segment
* tls_segment
,
287 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
288 elfcpp::Elf_types
<32>::Elf_Addr value
,
290 section_size_type view_size
);
292 // Do a TLS Local-Dynamic to Local-Exec transition.
294 tls_ld_to_le(const Relocate_info
<32, false>*, size_t relnum
,
295 Output_segment
* tls_segment
,
296 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
297 elfcpp::Elf_types
<32>::Elf_Addr value
,
299 section_size_type view_size
);
301 // Do a TLS Initial-Exec to Local-Exec transition.
303 tls_ie_to_le(const Relocate_info
<32, false>*, size_t relnum
,
304 Output_segment
* tls_segment
,
305 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
306 elfcpp::Elf_types
<32>::Elf_Addr value
,
308 section_size_type view_size
);
310 // Fix up LDO_32 relocations we've already seen.
312 fix_up_ldo(const Relocate_info
<32, false>*);
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_
;
329 // A list of LDO_32 offsets, in case we find LDM after LDO_32.
330 std::vector
<unsigned char*> ldo_addrs_
;
333 // A class which returns the size required for a relocation type,
334 // used while scanning relocs during a relocatable link.
335 class Relocatable_size_for_reloc
339 get_size_for_reloc(unsigned int, Relobj
*);
342 // Adjust TLS relocation type based on the options and whether this
343 // is a local symbol.
344 static tls::Tls_optimization
345 optimize_tls_reloc(bool is_final
, int r_type
);
347 // Get the GOT section, creating it if necessary.
348 Output_data_got
<32, false>*
349 got_section(Symbol_table
*, Layout
*);
351 // Get the GOT PLT section.
353 got_plt_section() const
355 gold_assert(this->got_plt_
!= NULL
);
356 return this->got_plt_
;
359 // Create a PLT entry for a global symbol.
361 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
363 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
365 define_tls_base_symbol(Symbol_table
*, Layout
*);
367 // Create a GOT entry for the TLS module index.
369 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
370 Sized_relobj
<32, false>* object
);
372 // Get the PLT section.
373 const Output_data_plt_i386
*
376 gold_assert(this->plt_
!= NULL
);
380 // Get the dynamic reloc section, creating it if necessary.
382 rel_dyn_section(Layout
*);
384 // Add a potential copy relocation.
386 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
387 Sized_relobj
<32, false>* object
,
388 unsigned int shndx
, Output_section
* output_section
,
389 Symbol
* sym
, const elfcpp::Rel
<32, false>& reloc
)
391 this->copy_relocs_
.copy_reloc(symtab
, layout
,
392 symtab
->get_sized_symbol
<32>(sym
),
393 object
, shndx
, output_section
, reloc
,
394 this->rel_dyn_section(layout
));
397 // Information about this specific target which we pass to the
398 // general Target structure.
399 static const Target::Target_info i386_info
;
401 // The types of GOT entries needed for this platform.
404 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
405 GOT_TYPE_TLS_NOFFSET
= 1, // GOT entry for negative TLS offset
406 GOT_TYPE_TLS_OFFSET
= 2, // GOT entry for positive TLS offset
407 GOT_TYPE_TLS_PAIR
= 3, // GOT entry for TLS module/offset pair
408 GOT_TYPE_TLS_DESC
= 4 // GOT entry for TLS_DESC pair
412 Output_data_got
<32, false>* got_
;
414 Output_data_plt_i386
* plt_
;
415 // The GOT PLT section.
416 Output_data_space
* got_plt_
;
417 // The dynamic reloc section.
418 Reloc_section
* rel_dyn_
;
419 // Relocs saved to avoid a COPY reloc.
420 Copy_relocs
<elfcpp::SHT_REL
, 32, false> copy_relocs_
;
421 // Space for variables copied with a COPY reloc.
422 Output_data_space
* dynbss_
;
423 // Offset of the GOT entry for the TLS module index.
424 unsigned int got_mod_index_offset_
;
425 // True if the _TLS_MODULE_BASE_ symbol has been defined.
426 bool tls_base_symbol_defined_
;
429 const Target::Target_info
Target_i386::i386_info
=
432 false, // is_big_endian
433 elfcpp::EM_386
, // machine_code
434 false, // has_make_symbol
435 false, // has_resolve
436 true, // has_code_fill
437 true, // is_default_stack_executable
439 "/usr/lib/libc.so.1", // dynamic_linker
440 0x08048000, // default_text_segment_address
441 0x1000, // abi_pagesize (overridable by -z max-page-size)
442 0x1000, // common_pagesize (overridable by -z common-page-size)
443 elfcpp::SHN_UNDEF
, // small_common_shndx
444 elfcpp::SHN_UNDEF
, // large_common_shndx
445 0, // small_common_section_flags
446 0 // large_common_section_flags
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
),
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
,
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_
);
505 return this->rel_dyn_
;
508 // A class to handle the PLT data.
510 class Output_data_plt_i386
: public Output_section_data
513 typedef Output_data_reloc
<elfcpp::SHT_REL
, true, 32, false> Reloc_section
;
515 Output_data_plt_i386(Layout
*, Output_data_space
*);
517 // Add an entry to the PLT.
519 add_entry(Symbol
* gsym
);
521 // Return the .rel.plt section data.
524 { return this->rel_
; }
528 do_adjust_output_section(Output_section
* os
);
530 // Write to a map file.
532 do_print_to_mapfile(Mapfile
* mapfile
) const
533 { mapfile
->print_output_data(this, _("** PLT")); }
536 // The size of an entry in the PLT.
537 static const int plt_entry_size
= 16;
539 // The first entry in the PLT for an executable.
540 static unsigned char exec_first_plt_entry
[plt_entry_size
];
542 // The first entry in the PLT for a shared object.
543 static unsigned char dyn_first_plt_entry
[plt_entry_size
];
545 // Other entries in the PLT for an executable.
546 static unsigned char exec_plt_entry
[plt_entry_size
];
548 // Other entries in the PLT for a shared object.
549 static unsigned char dyn_plt_entry
[plt_entry_size
];
551 // Set the final size.
553 set_final_data_size()
554 { this->set_data_size((this->count_
+ 1) * plt_entry_size
); }
556 // Write out the PLT data.
558 do_write(Output_file
*);
560 // The reloc section.
562 // The .got.plt section.
563 Output_data_space
* got_plt_
;
564 // The number of PLT entries.
568 // Create the PLT section. The ordinary .got section is an argument,
569 // since we need to refer to the start. We also create our own .got
570 // section just for PLT entries.
572 Output_data_plt_i386::Output_data_plt_i386(Layout
* layout
,
573 Output_data_space
* got_plt
)
574 : Output_section_data(4), got_plt_(got_plt
), count_(0)
576 this->rel_
= new Reloc_section(false);
577 layout
->add_output_section_data(".rel.plt", elfcpp::SHT_REL
,
578 elfcpp::SHF_ALLOC
, this->rel_
);
582 Output_data_plt_i386::do_adjust_output_section(Output_section
* os
)
584 // UnixWare sets the entsize of .plt to 4, and so does the old GNU
585 // linker, and so do we.
589 // Add an entry to the PLT.
592 Output_data_plt_i386::add_entry(Symbol
* gsym
)
594 gold_assert(!gsym
->has_plt_offset());
596 // Note that when setting the PLT offset we skip the initial
597 // reserved PLT entry.
598 gsym
->set_plt_offset((this->count_
+ 1) * plt_entry_size
);
602 section_offset_type got_offset
= this->got_plt_
->current_data_size();
604 // Every PLT entry needs a GOT entry which points back to the PLT
605 // entry (this will be changed by the dynamic linker, normally
606 // lazily when the function is called).
607 this->got_plt_
->set_current_data_size(got_offset
+ 4);
609 // Every PLT entry needs a reloc.
610 gsym
->set_needs_dynsym_entry();
611 this->rel_
->add_global(gsym
, elfcpp::R_386_JUMP_SLOT
, this->got_plt_
,
614 // Note that we don't need to save the symbol. The contents of the
615 // PLT are independent of which symbols are used. The symbols only
616 // appear in the relocations.
619 // The first entry in the PLT for an executable.
621 unsigned char Output_data_plt_i386::exec_first_plt_entry
[plt_entry_size
] =
623 0xff, 0x35, // pushl contents of memory address
624 0, 0, 0, 0, // replaced with address of .got + 4
625 0xff, 0x25, // jmp indirect
626 0, 0, 0, 0, // replaced with address of .got + 8
630 // The first entry in the PLT for a shared object.
632 unsigned char Output_data_plt_i386::dyn_first_plt_entry
[plt_entry_size
] =
634 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx)
635 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx)
639 // Subsequent entries in the PLT for an executable.
641 unsigned char Output_data_plt_i386::exec_plt_entry
[plt_entry_size
] =
643 0xff, 0x25, // jmp indirect
644 0, 0, 0, 0, // replaced with address of symbol in .got
645 0x68, // pushl immediate
646 0, 0, 0, 0, // replaced with offset into relocation table
647 0xe9, // jmp relative
648 0, 0, 0, 0 // replaced with offset to start of .plt
651 // Subsequent entries in the PLT for a shared object.
653 unsigned char Output_data_plt_i386::dyn_plt_entry
[plt_entry_size
] =
655 0xff, 0xa3, // jmp *offset(%ebx)
656 0, 0, 0, 0, // replaced with offset of symbol in .got
657 0x68, // pushl immediate
658 0, 0, 0, 0, // replaced with offset into relocation table
659 0xe9, // jmp relative
660 0, 0, 0, 0 // replaced with offset to start of .plt
663 // Write out the PLT. This uses the hand-coded instructions above,
664 // and adjusts them as needed. This is all specified by the i386 ELF
665 // Processor Supplement.
668 Output_data_plt_i386::do_write(Output_file
* of
)
670 const off_t offset
= this->offset();
671 const section_size_type oview_size
=
672 convert_to_section_size_type(this->data_size());
673 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
675 const off_t got_file_offset
= this->got_plt_
->offset();
676 const section_size_type got_size
=
677 convert_to_section_size_type(this->got_plt_
->data_size());
678 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
681 unsigned char* pov
= oview
;
683 elfcpp::Elf_types
<32>::Elf_Addr plt_address
= this->address();
684 elfcpp::Elf_types
<32>::Elf_Addr got_address
= this->got_plt_
->address();
686 if (parameters
->options().shared())
687 memcpy(pov
, dyn_first_plt_entry
, plt_entry_size
);
690 memcpy(pov
, exec_first_plt_entry
, plt_entry_size
);
691 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2, got_address
+ 4);
692 elfcpp::Swap
<32, false>::writeval(pov
+ 8, got_address
+ 8);
694 pov
+= plt_entry_size
;
696 unsigned char* got_pov
= got_view
;
698 memset(got_pov
, 0, 12);
701 const int rel_size
= elfcpp::Elf_sizes
<32>::rel_size
;
703 unsigned int plt_offset
= plt_entry_size
;
704 unsigned int plt_rel_offset
= 0;
705 unsigned int got_offset
= 12;
706 const unsigned int count
= this->count_
;
707 for (unsigned int i
= 0;
710 pov
+= plt_entry_size
,
712 plt_offset
+= plt_entry_size
,
713 plt_rel_offset
+= rel_size
,
716 // Set and adjust the PLT entry itself.
718 if (parameters
->options().shared())
720 memcpy(pov
, dyn_plt_entry
, plt_entry_size
);
721 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2, got_offset
);
725 memcpy(pov
, exec_plt_entry
, plt_entry_size
);
726 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
731 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 7, plt_rel_offset
);
732 elfcpp::Swap
<32, false>::writeval(pov
+ 12,
733 - (plt_offset
+ plt_entry_size
));
735 // Set the entry in the GOT.
736 elfcpp::Swap
<32, false>::writeval(got_pov
, plt_address
+ plt_offset
+ 6);
739 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
740 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
742 of
->write_output_view(offset
, oview_size
, oview
);
743 of
->write_output_view(got_file_offset
, got_size
, got_view
);
746 // Create a PLT entry for a global symbol.
749 Target_i386::make_plt_entry(Symbol_table
* symtab
, Layout
* layout
, Symbol
* gsym
)
751 if (gsym
->has_plt_offset())
754 if (this->plt_
== NULL
)
756 // Create the GOT sections first.
757 this->got_section(symtab
, layout
);
759 this->plt_
= new Output_data_plt_i386(layout
, this->got_plt_
);
760 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
762 | elfcpp::SHF_EXECINSTR
),
766 this->plt_
->add_entry(gsym
);
769 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
772 Target_i386::define_tls_base_symbol(Symbol_table
* symtab
, Layout
* layout
)
774 if (this->tls_base_symbol_defined_
)
777 Output_segment
* tls_segment
= layout
->tls_segment();
778 if (tls_segment
!= NULL
)
780 bool is_exec
= parameters
->options().output_is_executable();
781 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
785 elfcpp::STV_HIDDEN
, 0,
787 ? Symbol::SEGMENT_END
788 : Symbol::SEGMENT_START
),
791 this->tls_base_symbol_defined_
= true;
794 // Create a GOT entry for the TLS module index.
797 Target_i386::got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
798 Sized_relobj
<32, false>* object
)
800 if (this->got_mod_index_offset_
== -1U)
802 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
803 Reloc_section
* rel_dyn
= this->rel_dyn_section(layout
);
804 Output_data_got
<32, false>* got
= this->got_section(symtab
, layout
);
805 unsigned int got_offset
= got
->add_constant(0);
806 rel_dyn
->add_local(object
, 0, elfcpp::R_386_TLS_DTPMOD32
, got
,
808 got
->add_constant(0);
809 this->got_mod_index_offset_
= got_offset
;
811 return this->got_mod_index_offset_
;
814 // Optimize the TLS relocation type based on what we know about the
815 // symbol. IS_FINAL is true if the final address of this symbol is
816 // known at link time.
818 tls::Tls_optimization
819 Target_i386::optimize_tls_reloc(bool is_final
, int r_type
)
821 // If we are generating a shared library, then we can't do anything
823 if (parameters
->options().shared())
824 return tls::TLSOPT_NONE
;
828 case elfcpp::R_386_TLS_GD
:
829 case elfcpp::R_386_TLS_GOTDESC
:
830 case elfcpp::R_386_TLS_DESC_CALL
:
831 // These are General-Dynamic which permits fully general TLS
832 // access. Since we know that we are generating an executable,
833 // we can convert this to Initial-Exec. If we also know that
834 // this is a local symbol, we can further switch to Local-Exec.
836 return tls::TLSOPT_TO_LE
;
837 return tls::TLSOPT_TO_IE
;
839 case elfcpp::R_386_TLS_LDM
:
840 // This is Local-Dynamic, which refers to a local symbol in the
841 // dynamic TLS block. Since we know that we generating an
842 // executable, we can switch to Local-Exec.
843 return tls::TLSOPT_TO_LE
;
845 case elfcpp::R_386_TLS_LDO_32
:
846 // Another type of Local-Dynamic relocation.
847 return tls::TLSOPT_TO_LE
;
849 case elfcpp::R_386_TLS_IE
:
850 case elfcpp::R_386_TLS_GOTIE
:
851 case elfcpp::R_386_TLS_IE_32
:
852 // These are Initial-Exec relocs which get the thread offset
853 // from the GOT. If we know that we are linking against the
854 // local symbol, we can switch to Local-Exec, which links the
855 // thread offset into the instruction.
857 return tls::TLSOPT_TO_LE
;
858 return tls::TLSOPT_NONE
;
860 case elfcpp::R_386_TLS_LE
:
861 case elfcpp::R_386_TLS_LE_32
:
862 // When we already have Local-Exec, there is nothing further we
864 return tls::TLSOPT_NONE
;
871 // Report an unsupported relocation against a local symbol.
874 Target_i386::Scan::unsupported_reloc_local(Sized_relobj
<32, false>* object
,
877 gold_error(_("%s: unsupported reloc %u against local symbol"),
878 object
->name().c_str(), r_type
);
881 // Scan a relocation for a local symbol.
884 Target_i386::Scan::local(const General_options
&,
885 Symbol_table
* symtab
,
888 Sized_relobj
<32, false>* object
,
889 unsigned int data_shndx
,
890 Output_section
* output_section
,
891 const elfcpp::Rel
<32, false>& reloc
,
893 const elfcpp::Sym
<32, false>& lsym
)
897 case elfcpp::R_386_NONE
:
898 case elfcpp::R_386_GNU_VTINHERIT
:
899 case elfcpp::R_386_GNU_VTENTRY
:
902 case elfcpp::R_386_32
:
903 // If building a shared library (or a position-independent
904 // executable), we need to create a dynamic relocation for
905 // this location. The relocation applied at link time will
906 // apply the link-time value, so we flag the location with
907 // an R_386_RELATIVE relocation so the dynamic loader can
908 // relocate it easily.
909 if (parameters
->options().output_is_position_independent())
911 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
912 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
913 rel_dyn
->add_local_relative(object
, r_sym
, elfcpp::R_386_RELATIVE
,
914 output_section
, data_shndx
,
915 reloc
.get_r_offset());
919 case elfcpp::R_386_16
:
920 case elfcpp::R_386_8
:
921 // If building a shared library (or a position-independent
922 // executable), we need to create a dynamic relocation for
923 // this location. Because the addend needs to remain in the
924 // data section, we need to be careful not to apply this
925 // relocation statically.
926 if (parameters
->options().output_is_position_independent())
928 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
929 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
930 if (lsym
.get_st_type() != elfcpp::STT_SECTION
)
931 rel_dyn
->add_local(object
, r_sym
, r_type
, output_section
,
932 data_shndx
, reloc
.get_r_offset());
935 gold_assert(lsym
.get_st_value() == 0);
936 unsigned int shndx
= lsym
.get_st_shndx();
938 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
,
941 object
->error(_("section symbol %u has bad shndx %u"),
944 rel_dyn
->add_local_section(object
, shndx
,
945 r_type
, output_section
,
946 data_shndx
, reloc
.get_r_offset());
951 case elfcpp::R_386_PC32
:
952 case elfcpp::R_386_PC16
:
953 case elfcpp::R_386_PC8
:
956 case elfcpp::R_386_PLT32
:
957 // Since we know this is a local symbol, we can handle this as a
961 case elfcpp::R_386_GOTOFF
:
962 case elfcpp::R_386_GOTPC
:
963 // We need a GOT section.
964 target
->got_section(symtab
, layout
);
967 case elfcpp::R_386_GOT32
:
969 // The symbol requires a GOT entry.
970 Output_data_got
<32, false>* got
= target
->got_section(symtab
, layout
);
971 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
972 if (got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
))
974 // If we are generating a shared object, we need to add a
975 // dynamic RELATIVE relocation for this symbol's GOT entry.
976 if (parameters
->options().output_is_position_independent())
978 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
979 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
980 rel_dyn
->add_local_relative(
981 object
, r_sym
, elfcpp::R_386_RELATIVE
, got
,
982 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
));
988 // These are relocations which should only be seen by the
989 // dynamic linker, and should never be seen here.
990 case elfcpp::R_386_COPY
:
991 case elfcpp::R_386_GLOB_DAT
:
992 case elfcpp::R_386_JUMP_SLOT
:
993 case elfcpp::R_386_RELATIVE
:
994 case elfcpp::R_386_TLS_TPOFF
:
995 case elfcpp::R_386_TLS_DTPMOD32
:
996 case elfcpp::R_386_TLS_DTPOFF32
:
997 case elfcpp::R_386_TLS_TPOFF32
:
998 case elfcpp::R_386_TLS_DESC
:
999 gold_error(_("%s: unexpected reloc %u in object file"),
1000 object
->name().c_str(), r_type
);
1003 // These are initial TLS relocs, which are expected when
1005 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1006 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
1007 case elfcpp::R_386_TLS_DESC_CALL
:
1008 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1009 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1010 case elfcpp::R_386_TLS_IE
: // Initial-exec
1011 case elfcpp::R_386_TLS_IE_32
:
1012 case elfcpp::R_386_TLS_GOTIE
:
1013 case elfcpp::R_386_TLS_LE
: // Local-exec
1014 case elfcpp::R_386_TLS_LE_32
:
1016 bool output_is_shared
= parameters
->options().shared();
1017 const tls::Tls_optimization optimized_type
1018 = Target_i386::optimize_tls_reloc(!output_is_shared
, r_type
);
1021 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1022 if (optimized_type
== tls::TLSOPT_NONE
)
1024 // Create a pair of GOT entries for the module index and
1025 // dtv-relative offset.
1026 Output_data_got
<32, false>* got
1027 = target
->got_section(symtab
, layout
);
1028 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1029 unsigned int shndx
= lsym
.get_st_shndx();
1031 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
1033 object
->error(_("local symbol %u has bad shndx %u"),
1036 got
->add_local_pair_with_rel(object
, r_sym
, shndx
,
1038 target
->rel_dyn_section(layout
),
1039 elfcpp::R_386_TLS_DTPMOD32
, 0);
1041 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1042 unsupported_reloc_local(object
, r_type
);
1045 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva)
1046 target
->define_tls_base_symbol(symtab
, layout
);
1047 if (optimized_type
== tls::TLSOPT_NONE
)
1049 // Create a double GOT entry with an R_386_TLS_DESC reloc.
1050 Output_data_got
<32, false>* got
1051 = target
->got_section(symtab
, layout
);
1052 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1053 unsigned int shndx
= lsym
.get_st_shndx();
1055 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
1057 object
->error(_("local symbol %u has bad shndx %u"),
1060 got
->add_local_pair_with_rel(object
, r_sym
, shndx
,
1062 target
->rel_dyn_section(layout
),
1063 elfcpp::R_386_TLS_DESC
, 0);
1065 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1066 unsupported_reloc_local(object
, r_type
);
1069 case elfcpp::R_386_TLS_DESC_CALL
:
1072 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1073 if (optimized_type
== tls::TLSOPT_NONE
)
1075 // Create a GOT entry for the module index.
1076 target
->got_mod_index_entry(symtab
, layout
, object
);
1078 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1079 unsupported_reloc_local(object
, r_type
);
1082 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1085 case elfcpp::R_386_TLS_IE
: // Initial-exec
1086 case elfcpp::R_386_TLS_IE_32
:
1087 case elfcpp::R_386_TLS_GOTIE
:
1088 layout
->set_has_static_tls();
1089 if (optimized_type
== tls::TLSOPT_NONE
)
1091 // For the R_386_TLS_IE relocation, we need to create a
1092 // dynamic relocation when building a shared library.
1093 if (r_type
== elfcpp::R_386_TLS_IE
1094 && parameters
->options().shared())
1096 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1098 = elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1099 rel_dyn
->add_local_relative(object
, r_sym
,
1100 elfcpp::R_386_RELATIVE
,
1101 output_section
, data_shndx
,
1102 reloc
.get_r_offset());
1104 // Create a GOT entry for the tp-relative offset.
1105 Output_data_got
<32, false>* got
1106 = target
->got_section(symtab
, layout
);
1107 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1108 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_IE_32
1109 ? elfcpp::R_386_TLS_TPOFF32
1110 : elfcpp::R_386_TLS_TPOFF
);
1111 unsigned int got_type
= (r_type
== elfcpp::R_386_TLS_IE_32
1112 ? GOT_TYPE_TLS_OFFSET
1113 : GOT_TYPE_TLS_NOFFSET
);
1114 got
->add_local_with_rel(object
, r_sym
, got_type
,
1115 target
->rel_dyn_section(layout
),
1118 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1119 unsupported_reloc_local(object
, r_type
);
1122 case elfcpp::R_386_TLS_LE
: // Local-exec
1123 case elfcpp::R_386_TLS_LE_32
:
1124 layout
->set_has_static_tls();
1125 if (output_is_shared
)
1127 // We need to create a dynamic relocation.
1128 gold_assert(lsym
.get_st_type() != elfcpp::STT_SECTION
);
1129 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1130 unsigned int dyn_r_type
= (r_type
== elfcpp::R_386_TLS_LE_32
1131 ? elfcpp::R_386_TLS_TPOFF32
1132 : elfcpp::R_386_TLS_TPOFF
);
1133 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1134 rel_dyn
->add_local(object
, r_sym
, dyn_r_type
, output_section
,
1135 data_shndx
, reloc
.get_r_offset());
1145 case elfcpp::R_386_32PLT
:
1146 case elfcpp::R_386_TLS_GD_32
:
1147 case elfcpp::R_386_TLS_GD_PUSH
:
1148 case elfcpp::R_386_TLS_GD_CALL
:
1149 case elfcpp::R_386_TLS_GD_POP
:
1150 case elfcpp::R_386_TLS_LDM_32
:
1151 case elfcpp::R_386_TLS_LDM_PUSH
:
1152 case elfcpp::R_386_TLS_LDM_CALL
:
1153 case elfcpp::R_386_TLS_LDM_POP
:
1154 case elfcpp::R_386_USED_BY_INTEL_200
:
1156 unsupported_reloc_local(object
, r_type
);
1161 // Report an unsupported relocation against a global symbol.
1164 Target_i386::Scan::unsupported_reloc_global(Sized_relobj
<32, false>* object
,
1165 unsigned int r_type
,
1168 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1169 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
1172 // Scan a relocation for a global symbol.
1175 Target_i386::Scan::global(const General_options
&,
1176 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
->type() == elfcpp::STT_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(const General_options
& options
,
1493 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
,
1516 needs_special_offset_handling
,
1521 // Scan relocations for a section.
1524 Target_i386::scan_relocs(const General_options
& options
,
1525 Symbol_table
* symtab
,
1527 Sized_relobj
<32, false>* object
,
1528 unsigned int data_shndx
,
1529 unsigned int sh_type
,
1530 const unsigned char* prelocs
,
1532 Output_section
* output_section
,
1533 bool needs_special_offset_handling
,
1534 size_t local_symbol_count
,
1535 const unsigned char* plocal_symbols
)
1537 if (sh_type
== elfcpp::SHT_RELA
)
1539 gold_error(_("%s: unsupported RELA reloc section"),
1540 object
->name().c_str());
1544 gold::scan_relocs
<32, false, Target_i386
, elfcpp::SHT_REL
,
1555 needs_special_offset_handling
,
1560 // Finalize the sections.
1563 Target_i386::do_finalize_sections(Layout
* layout
)
1565 // Fill in some more dynamic tags.
1566 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
1569 if (this->got_plt_
!= NULL
)
1570 odyn
->add_section_address(elfcpp::DT_PLTGOT
, this->got_plt_
);
1572 if (this->plt_
!= NULL
)
1574 const Output_data
* od
= this->plt_
->rel_plt();
1575 odyn
->add_section_size(elfcpp::DT_PLTRELSZ
, od
);
1576 odyn
->add_section_address(elfcpp::DT_JMPREL
, od
);
1577 odyn
->add_constant(elfcpp::DT_PLTREL
, elfcpp::DT_REL
);
1580 if (this->rel_dyn_
!= NULL
)
1582 const Output_data
* od
= this->rel_dyn_
;
1583 odyn
->add_section_address(elfcpp::DT_REL
, od
);
1584 odyn
->add_section_size(elfcpp::DT_RELSZ
, od
);
1585 odyn
->add_constant(elfcpp::DT_RELENT
,
1586 elfcpp::Elf_sizes
<32>::rel_size
);
1589 if (!parameters
->options().shared())
1591 // The value of the DT_DEBUG tag is filled in by the dynamic
1592 // linker at run time, and used by the debugger.
1593 odyn
->add_constant(elfcpp::DT_DEBUG
, 0);
1597 // Emit any relocs we saved in an attempt to avoid generating COPY
1599 if (this->copy_relocs_
.any_saved_relocs())
1600 this->copy_relocs_
.emit(this->rel_dyn_section(layout
));
1603 // Return whether a direct absolute static relocation needs to be applied.
1604 // In cases where Scan::local() or Scan::global() has created
1605 // a dynamic relocation other than R_386_RELATIVE, the addend
1606 // of the relocation is carried in the data, and we must not
1607 // apply the static relocation.
1610 Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol
<32>* gsym
,
1613 Output_section
* output_section
)
1615 // If the output section is not allocated, then we didn't call
1616 // scan_relocs, we didn't create a dynamic reloc, and we must apply
1618 if ((output_section
->flags() & elfcpp::SHF_ALLOC
) == 0)
1621 // For local symbols, we will have created a non-RELATIVE dynamic
1622 // relocation only if (a) the output is position independent,
1623 // (b) the relocation is absolute (not pc- or segment-relative), and
1624 // (c) the relocation is not 32 bits wide.
1626 return !(parameters
->options().output_is_position_independent()
1627 && (ref_flags
& Symbol::ABSOLUTE_REF
)
1630 // For global symbols, we use the same helper routines used in the
1631 // scan pass. If we did not create a dynamic relocation, or if we
1632 // created a RELATIVE dynamic relocation, we should apply the static
1634 bool has_dyn
= gsym
->needs_dynamic_reloc(ref_flags
);
1635 bool is_rel
= (ref_flags
& Symbol::ABSOLUTE_REF
)
1636 && gsym
->can_use_relative_reloc(ref_flags
1637 & Symbol::FUNCTION_CALL
);
1638 return !has_dyn
|| is_rel
;
1641 // Perform a relocation.
1644 Target_i386::Relocate::relocate(const Relocate_info
<32, false>* relinfo
,
1645 Target_i386
* target
,
1646 Output_section
*output_section
,
1648 const elfcpp::Rel
<32, false>& rel
,
1649 unsigned int r_type
,
1650 const Sized_symbol
<32>* gsym
,
1651 const Symbol_value
<32>* psymval
,
1652 unsigned char* view
,
1653 elfcpp::Elf_types
<32>::Elf_Addr address
,
1654 section_size_type view_size
)
1656 if (this->skip_call_tls_get_addr_
)
1658 if ((r_type
!= elfcpp::R_386_PLT32
1659 && r_type
!= elfcpp::R_386_PC32
)
1661 || strcmp(gsym
->name(), "___tls_get_addr") != 0)
1662 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
1663 _("missing expected TLS relocation"));
1666 this->skip_call_tls_get_addr_
= false;
1671 // Pick the value to use for symbols defined in shared objects.
1672 Symbol_value
<32> symval
;
1674 && gsym
->use_plt_offset(r_type
== elfcpp::R_386_PC8
1675 || r_type
== elfcpp::R_386_PC16
1676 || r_type
== elfcpp::R_386_PC32
))
1678 symval
.set_output_value(target
->plt_section()->address()
1679 + gsym
->plt_offset());
1683 const Sized_relobj
<32, false>* object
= relinfo
->object
;
1685 // Get the GOT offset if needed.
1686 // The GOT pointer points to the end of the GOT section.
1687 // We need to subtract the size of the GOT section to get
1688 // the actual offset to use in the relocation.
1689 bool have_got_offset
= false;
1690 unsigned int got_offset
= 0;
1693 case elfcpp::R_386_GOT32
:
1696 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
1697 got_offset
= (gsym
->got_offset(GOT_TYPE_STANDARD
)
1698 - target
->got_size());
1702 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
1703 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
1704 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
1705 - target
->got_size());
1707 have_got_offset
= true;
1716 case elfcpp::R_386_NONE
:
1717 case elfcpp::R_386_GNU_VTINHERIT
:
1718 case elfcpp::R_386_GNU_VTENTRY
:
1721 case elfcpp::R_386_32
:
1722 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, true,
1724 Relocate_functions
<32, false>::rel32(view
, object
, psymval
);
1727 case elfcpp::R_386_PC32
:
1729 int ref_flags
= Symbol::NON_PIC_REF
;
1730 if (gsym
!= NULL
&& gsym
->type() == elfcpp::STT_FUNC
)
1731 ref_flags
|= Symbol::FUNCTION_CALL
;
1732 if (should_apply_static_reloc(gsym
, ref_flags
, true, output_section
))
1733 Relocate_functions
<32, false>::pcrel32(view
, object
, psymval
, address
);
1737 case elfcpp::R_386_16
:
1738 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, false,
1740 Relocate_functions
<32, false>::rel16(view
, object
, psymval
);
1743 case elfcpp::R_386_PC16
:
1745 int ref_flags
= Symbol::NON_PIC_REF
;
1746 if (gsym
!= NULL
&& gsym
->type() == elfcpp::STT_FUNC
)
1747 ref_flags
|= Symbol::FUNCTION_CALL
;
1748 if (should_apply_static_reloc(gsym
, ref_flags
, false, output_section
))
1749 Relocate_functions
<32, false>::pcrel16(view
, object
, psymval
, address
);
1753 case elfcpp::R_386_8
:
1754 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, false,
1756 Relocate_functions
<32, false>::rel8(view
, object
, psymval
);
1759 case elfcpp::R_386_PC8
:
1761 int ref_flags
= Symbol::NON_PIC_REF
;
1762 if (gsym
!= NULL
&& gsym
->type() == elfcpp::STT_FUNC
)
1763 ref_flags
|= Symbol::FUNCTION_CALL
;
1764 if (should_apply_static_reloc(gsym
, ref_flags
, false,
1766 Relocate_functions
<32, false>::pcrel8(view
, object
, psymval
, address
);
1770 case elfcpp::R_386_PLT32
:
1771 gold_assert(gsym
== NULL
1772 || gsym
->has_plt_offset()
1773 || gsym
->final_value_is_known()
1774 || (gsym
->is_defined()
1775 && !gsym
->is_from_dynobj()
1776 && !gsym
->is_preemptible()));
1777 Relocate_functions
<32, false>::pcrel32(view
, object
, psymval
, address
);
1780 case elfcpp::R_386_GOT32
:
1781 gold_assert(have_got_offset
);
1782 Relocate_functions
<32, false>::rel32(view
, got_offset
);
1785 case elfcpp::R_386_GOTOFF
:
1787 elfcpp::Elf_types
<32>::Elf_Addr value
;
1788 value
= (psymval
->value(object
, 0)
1789 - target
->got_plt_section()->address());
1790 Relocate_functions
<32, false>::rel32(view
, value
);
1794 case elfcpp::R_386_GOTPC
:
1796 elfcpp::Elf_types
<32>::Elf_Addr value
;
1797 value
= target
->got_plt_section()->address();
1798 Relocate_functions
<32, false>::pcrel32(view
, value
, address
);
1802 case elfcpp::R_386_COPY
:
1803 case elfcpp::R_386_GLOB_DAT
:
1804 case elfcpp::R_386_JUMP_SLOT
:
1805 case elfcpp::R_386_RELATIVE
:
1806 // These are outstanding tls relocs, which are unexpected when
1808 case elfcpp::R_386_TLS_TPOFF
:
1809 case elfcpp::R_386_TLS_DTPMOD32
:
1810 case elfcpp::R_386_TLS_DTPOFF32
:
1811 case elfcpp::R_386_TLS_TPOFF32
:
1812 case elfcpp::R_386_TLS_DESC
:
1813 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
1814 _("unexpected reloc %u in object file"),
1818 // These are initial tls relocs, which are expected when
1820 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1821 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
1822 case elfcpp::R_386_TLS_DESC_CALL
:
1823 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
1824 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
1825 case elfcpp::R_386_TLS_IE
: // Initial-exec
1826 case elfcpp::R_386_TLS_IE_32
:
1827 case elfcpp::R_386_TLS_GOTIE
:
1828 case elfcpp::R_386_TLS_LE
: // Local-exec
1829 case elfcpp::R_386_TLS_LE_32
:
1830 this->relocate_tls(relinfo
, target
, relnum
, rel
, r_type
, gsym
, psymval
,
1831 view
, address
, view_size
);
1834 case elfcpp::R_386_32PLT
:
1835 case elfcpp::R_386_TLS_GD_32
:
1836 case elfcpp::R_386_TLS_GD_PUSH
:
1837 case elfcpp::R_386_TLS_GD_CALL
:
1838 case elfcpp::R_386_TLS_GD_POP
:
1839 case elfcpp::R_386_TLS_LDM_32
:
1840 case elfcpp::R_386_TLS_LDM_PUSH
:
1841 case elfcpp::R_386_TLS_LDM_CALL
:
1842 case elfcpp::R_386_TLS_LDM_POP
:
1843 case elfcpp::R_386_USED_BY_INTEL_200
:
1845 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
1846 _("unsupported reloc %u"),
1854 // Perform a TLS relocation.
1857 Target_i386::Relocate::relocate_tls(const Relocate_info
<32, false>* relinfo
,
1858 Target_i386
* target
,
1860 const elfcpp::Rel
<32, false>& rel
,
1861 unsigned int r_type
,
1862 const Sized_symbol
<32>* gsym
,
1863 const Symbol_value
<32>* psymval
,
1864 unsigned char* view
,
1865 elfcpp::Elf_types
<32>::Elf_Addr
,
1866 section_size_type view_size
)
1868 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
1870 const Sized_relobj
<32, false>* object
= relinfo
->object
;
1872 elfcpp::Elf_types
<32>::Elf_Addr value
= psymval
->value(object
, 0);
1874 const bool is_final
=
1876 ? !parameters
->options().output_is_position_independent()
1877 : gsym
->final_value_is_known());
1878 const tls::Tls_optimization optimized_type
1879 = Target_i386::optimize_tls_reloc(is_final
, r_type
);
1882 case elfcpp::R_386_TLS_GD
: // Global-dynamic
1883 if (optimized_type
== tls::TLSOPT_TO_LE
)
1885 gold_assert(tls_segment
!= NULL
);
1886 this->tls_gd_to_le(relinfo
, relnum
, tls_segment
,
1887 rel
, r_type
, value
, view
,
1893 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
1894 ? GOT_TYPE_TLS_NOFFSET
1895 : GOT_TYPE_TLS_PAIR
);
1896 unsigned int got_offset
;
1899 gold_assert(gsym
->has_got_offset(got_type
));
1900 got_offset
= gsym
->got_offset(got_type
) - target
->got_size();
1904 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
1905 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
1906 got_offset
= (object
->local_got_offset(r_sym
, got_type
)
1907 - target
->got_size());
1909 if (optimized_type
== tls::TLSOPT_TO_IE
)
1911 gold_assert(tls_segment
!= NULL
);
1912 this->tls_gd_to_ie(relinfo
, relnum
, tls_segment
, rel
, r_type
,
1913 got_offset
, view
, view_size
);
1916 else if (optimized_type
== tls::TLSOPT_NONE
)
1918 // Relocate the field with the offset of the pair of GOT
1920 Relocate_functions
<32, false>::rel32(view
, got_offset
);
1924 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
1925 _("unsupported reloc %u"),
1929 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
1930 case elfcpp::R_386_TLS_DESC_CALL
:
1931 if (this->local_dynamic_type_
== LOCAL_DYNAMIC_NONE
)
1932 this->fix_up_ldo(relinfo
);
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 else if (this->local_dynamic_type_
== LOCAL_DYNAMIC_NONE
)
1992 this->fix_up_ldo(relinfo
);
1993 this->local_dynamic_type_
= LOCAL_DYNAMIC_GNU
;
1994 if (optimized_type
== tls::TLSOPT_TO_LE
)
1996 gold_assert(tls_segment
!= NULL
);
1997 this->tls_ld_to_le(relinfo
, relnum
, tls_segment
, rel
, r_type
,
1998 value
, view
, view_size
);
2001 else if (optimized_type
== tls::TLSOPT_NONE
)
2003 // Relocate the field with the offset of the GOT entry for
2004 // the module index.
2005 unsigned int got_offset
;
2006 got_offset
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
)
2007 - target
->got_size());
2008 Relocate_functions
<32, false>::rel32(view
, got_offset
);
2011 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2012 _("unsupported reloc %u"),
2016 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
2017 // This reloc can appear in debugging sections, in which case we
2018 // won't see the TLS_LDM reloc. The local_dynamic_type field
2020 if (optimized_type
== tls::TLSOPT_TO_LE
2021 && this->local_dynamic_type_
!= LOCAL_DYNAMIC_NONE
)
2023 gold_assert(tls_segment
!= NULL
);
2024 value
-= tls_segment
->memsz();
2028 // We may see the LDM later.
2029 this->ldo_addrs_
.push_back(view
);
2031 Relocate_functions
<32, false>::rel32(view
, value
);
2034 case elfcpp::R_386_TLS_IE
: // Initial-exec
2035 case elfcpp::R_386_TLS_GOTIE
:
2036 case elfcpp::R_386_TLS_IE_32
:
2037 if (optimized_type
== tls::TLSOPT_TO_LE
)
2039 gold_assert(tls_segment
!= NULL
);
2040 Target_i386::Relocate::tls_ie_to_le(relinfo
, relnum
, tls_segment
,
2041 rel
, r_type
, value
, view
,
2045 else if (optimized_type
== tls::TLSOPT_NONE
)
2047 // Relocate the field with the offset of the GOT entry for
2048 // the tp-relative offset of the symbol.
2049 unsigned int got_type
= (r_type
== elfcpp::R_386_TLS_IE_32
2050 ? GOT_TYPE_TLS_OFFSET
2051 : GOT_TYPE_TLS_NOFFSET
);
2052 unsigned int got_offset
;
2055 gold_assert(gsym
->has_got_offset(got_type
));
2056 got_offset
= gsym
->got_offset(got_type
);
2060 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
2061 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
2062 got_offset
= object
->local_got_offset(r_sym
, got_type
);
2064 // For the R_386_TLS_IE relocation, we need to apply the
2065 // absolute address of the GOT entry.
2066 if (r_type
== elfcpp::R_386_TLS_IE
)
2067 got_offset
+= target
->got_plt_section()->address();
2068 // All GOT offsets are relative to the end of the GOT.
2069 got_offset
-= target
->got_size();
2070 Relocate_functions
<32, false>::rel32(view
, got_offset
);
2073 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2074 _("unsupported reloc %u"),
2078 case elfcpp::R_386_TLS_LE
: // Local-exec
2079 // If we're creating a shared library, a dynamic relocation will
2080 // have been created for this location, so do not apply it now.
2081 if (!parameters
->options().shared())
2083 gold_assert(tls_segment
!= NULL
);
2084 value
-= tls_segment
->memsz();
2085 Relocate_functions
<32, false>::rel32(view
, value
);
2089 case elfcpp::R_386_TLS_LE_32
:
2090 // If we're creating a shared library, a dynamic relocation will
2091 // have been created for this location, so do not apply it now.
2092 if (!parameters
->options().shared())
2094 gold_assert(tls_segment
!= NULL
);
2095 value
= tls_segment
->memsz() - value
;
2096 Relocate_functions
<32, false>::rel32(view
, value
);
2102 // Do a relocation in which we convert a TLS General-Dynamic to a
2106 Target_i386::Relocate::tls_gd_to_le(const Relocate_info
<32, false>* relinfo
,
2108 Output_segment
* tls_segment
,
2109 const elfcpp::Rel
<32, false>& rel
,
2111 elfcpp::Elf_types
<32>::Elf_Addr value
,
2112 unsigned char* view
,
2113 section_size_type view_size
)
2115 // leal foo(,%reg,1),%eax; call ___tls_get_addr
2116 // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
2117 // leal foo(%reg),%eax; call ___tls_get_addr
2118 // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
2120 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2121 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 9);
2123 unsigned char op1
= view
[-1];
2124 unsigned char op2
= view
[-2];
2126 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2127 op2
== 0x8d || op2
== 0x04);
2128 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[4] == 0xe8);
2134 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -3);
2135 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[-3] == 0x8d);
2136 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2137 ((op1
& 0xc7) == 0x05 && op1
!= (4 << 3)));
2138 memcpy(view
- 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2142 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2143 (op1
& 0xf8) == 0x80 && (op1
& 7) != 4);
2144 if (rel
.get_r_offset() + 9 < view_size
2147 // There is a trailing nop. Use the size byte subl.
2148 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2153 // Use the five byte subl.
2154 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2158 value
= tls_segment
->memsz() - value
;
2159 Relocate_functions
<32, false>::rel32(view
+ roff
, value
);
2161 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2163 this->skip_call_tls_get_addr_
= true;
2166 // Do a relocation in which we convert a TLS General-Dynamic to an
2170 Target_i386::Relocate::tls_gd_to_ie(const Relocate_info
<32, false>* relinfo
,
2173 const elfcpp::Rel
<32, false>& rel
,
2175 elfcpp::Elf_types
<32>::Elf_Addr value
,
2176 unsigned char* view
,
2177 section_size_type view_size
)
2179 // leal foo(,%ebx,1),%eax; call ___tls_get_addr
2180 // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax
2182 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2183 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 9);
2185 unsigned char op1
= view
[-1];
2186 unsigned char op2
= view
[-2];
2188 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2189 op2
== 0x8d || op2
== 0x04);
2190 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[4] == 0xe8);
2194 // FIXME: For now, support only the first (SIB) form.
2195 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), op2
== 0x04);
2199 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -3);
2200 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[-3] == 0x8d);
2201 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2202 ((op1
& 0xc7) == 0x05 && op1
!= (4 << 3)));
2203 memcpy(view
- 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12);
2207 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2208 (op1
& 0xf8) == 0x80 && (op1
& 7) != 4);
2209 if (rel
.get_r_offset() + 9 < view_size
2212 // FIXME: This is not the right instruction sequence.
2213 // There is a trailing nop. Use the size byte subl.
2214 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2219 // FIXME: This is not the right instruction sequence.
2220 // Use the five byte subl.
2221 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2225 Relocate_functions
<32, false>::rel32(view
+ roff
, value
);
2227 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2229 this->skip_call_tls_get_addr_
= true;
2232 // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL
2233 // General-Dynamic to a Local-Exec.
2236 Target_i386::Relocate::tls_desc_gd_to_le(
2237 const Relocate_info
<32, false>* relinfo
,
2239 Output_segment
* tls_segment
,
2240 const elfcpp::Rel
<32, false>& rel
,
2241 unsigned int r_type
,
2242 elfcpp::Elf_types
<32>::Elf_Addr value
,
2243 unsigned char* view
,
2244 section_size_type view_size
)
2246 if (r_type
== elfcpp::R_386_TLS_GOTDESC
)
2248 // leal foo@TLSDESC(%ebx), %eax
2249 // ==> leal foo@NTPOFF, %eax
2250 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2251 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
2252 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2253 view
[-2] == 0x8d && view
[-1] == 0x83);
2255 value
-= tls_segment
->memsz();
2256 Relocate_functions
<32, false>::rel32(view
, value
);
2260 // call *foo@TLSCALL(%eax)
2262 gold_assert(r_type
== elfcpp::R_386_TLS_DESC_CALL
);
2263 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 2);
2264 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2265 view
[0] == 0xff && view
[1] == 0x10);
2271 // Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL
2272 // General-Dynamic to an Initial-Exec.
2275 Target_i386::Relocate::tls_desc_gd_to_ie(
2276 const Relocate_info
<32, false>* relinfo
,
2279 const elfcpp::Rel
<32, false>& rel
,
2280 unsigned int r_type
,
2281 elfcpp::Elf_types
<32>::Elf_Addr value
,
2282 unsigned char* view
,
2283 section_size_type view_size
)
2285 if (r_type
== elfcpp::R_386_TLS_GOTDESC
)
2287 // leal foo@TLSDESC(%ebx), %eax
2288 // ==> movl foo@GOTNTPOFF(%ebx), %eax
2289 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2290 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
2291 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2292 view
[-2] == 0x8d && view
[-1] == 0x83);
2294 Relocate_functions
<32, false>::rel32(view
, value
);
2298 // call *foo@TLSCALL(%eax)
2300 gold_assert(r_type
== elfcpp::R_386_TLS_DESC_CALL
);
2301 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 2);
2302 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2303 view
[0] == 0xff && view
[1] == 0x10);
2309 // Do a relocation in which we convert a TLS Local-Dynamic to a
2313 Target_i386::Relocate::tls_ld_to_le(const Relocate_info
<32, false>* relinfo
,
2316 const elfcpp::Rel
<32, false>& rel
,
2318 elfcpp::Elf_types
<32>::Elf_Addr
,
2319 unsigned char* view
,
2320 section_size_type view_size
)
2322 // leal foo(%reg), %eax; call ___tls_get_addr
2323 // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi
2325 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2326 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 9);
2328 // FIXME: Does this test really always pass?
2329 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2330 view
[-2] == 0x8d && view
[-1] == 0x83);
2332 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), view
[4] == 0xe8);
2334 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11);
2336 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2338 this->skip_call_tls_get_addr_
= true;
2341 // Do a relocation in which we convert a TLS Initial-Exec to a
2345 Target_i386::Relocate::tls_ie_to_le(const Relocate_info
<32, false>* relinfo
,
2347 Output_segment
* tls_segment
,
2348 const elfcpp::Rel
<32, false>& rel
,
2349 unsigned int r_type
,
2350 elfcpp::Elf_types
<32>::Elf_Addr value
,
2351 unsigned char* view
,
2352 section_size_type view_size
)
2354 // We have to actually change the instructions, which means that we
2355 // need to examine the opcodes to figure out which instruction we
2357 if (r_type
== elfcpp::R_386_TLS_IE
)
2359 // movl %gs:XX,%eax ==> movl $YY,%eax
2360 // movl %gs:XX,%reg ==> movl $YY,%reg
2361 // addl %gs:XX,%reg ==> addl $YY,%reg
2362 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -1);
2363 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
2365 unsigned char op1
= view
[-1];
2368 // movl XX,%eax ==> movl $YY,%eax
2373 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2375 unsigned char op2
= view
[-2];
2378 // movl XX,%reg ==> movl $YY,%reg
2379 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2380 (op1
& 0xc7) == 0x05);
2382 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
2384 else if (op2
== 0x03)
2386 // addl XX,%reg ==> addl $YY,%reg
2387 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2388 (op1
& 0xc7) == 0x05);
2390 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
2393 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), 0);
2398 // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
2399 // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
2400 // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
2401 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, -2);
2402 tls::check_range(relinfo
, relnum
, rel
.get_r_offset(), view_size
, 4);
2404 unsigned char op1
= view
[-1];
2405 unsigned char op2
= view
[-2];
2406 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(),
2407 (op1
& 0xc0) == 0x80 && (op1
& 7) != 4);
2410 // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
2412 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
2414 else if (op2
== 0x2b)
2416 // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
2418 view
[-1] = 0xe8 | ((op1
>> 3) & 7);
2420 else if (op2
== 0x03)
2422 // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
2424 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
2427 tls::check_tls(relinfo
, relnum
, rel
.get_r_offset(), 0);
2430 value
= tls_segment
->memsz() - value
;
2431 if (r_type
== elfcpp::R_386_TLS_IE
|| r_type
== elfcpp::R_386_TLS_GOTIE
)
2434 Relocate_functions
<32, false>::rel32(view
, value
);
2437 // If we see an LDM reloc after we handled any LDO_32 relocs, fix up
2438 // the LDO_32 relocs.
2441 Target_i386::Relocate::fix_up_ldo(const Relocate_info
<32, false>* relinfo
)
2443 if (this->ldo_addrs_
.empty())
2445 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
2446 gold_assert(tls_segment
!= NULL
);
2447 elfcpp::Elf_types
<32>::Elf_Addr value
= - tls_segment
->memsz();
2448 for (std::vector
<unsigned char*>::const_iterator p
= this->ldo_addrs_
.begin();
2449 p
!= this->ldo_addrs_
.end();
2451 Relocate_functions
<32, false>::rel32(*p
, value
);
2452 this->ldo_addrs_
.clear();
2455 // Relocate section data.
2458 Target_i386::relocate_section(const Relocate_info
<32, false>* relinfo
,
2459 unsigned int sh_type
,
2460 const unsigned char* prelocs
,
2462 Output_section
* output_section
,
2463 bool needs_special_offset_handling
,
2464 unsigned char* view
,
2465 elfcpp::Elf_types
<32>::Elf_Addr address
,
2466 section_size_type view_size
)
2468 gold_assert(sh_type
== elfcpp::SHT_REL
);
2470 gold::relocate_section
<32, false, Target_i386
, elfcpp::SHT_REL
,
2471 Target_i386::Relocate
>(
2477 needs_special_offset_handling
,
2483 // Return the size of a relocation while scanning during a relocatable
2487 Target_i386::Relocatable_size_for_reloc::get_size_for_reloc(
2488 unsigned int r_type
,
2493 case elfcpp::R_386_NONE
:
2494 case elfcpp::R_386_GNU_VTINHERIT
:
2495 case elfcpp::R_386_GNU_VTENTRY
:
2496 case elfcpp::R_386_TLS_GD
: // Global-dynamic
2497 case elfcpp::R_386_TLS_GOTDESC
: // Global-dynamic (from ~oliva url)
2498 case elfcpp::R_386_TLS_DESC_CALL
:
2499 case elfcpp::R_386_TLS_LDM
: // Local-dynamic
2500 case elfcpp::R_386_TLS_LDO_32
: // Alternate local-dynamic
2501 case elfcpp::R_386_TLS_IE
: // Initial-exec
2502 case elfcpp::R_386_TLS_IE_32
:
2503 case elfcpp::R_386_TLS_GOTIE
:
2504 case elfcpp::R_386_TLS_LE
: // Local-exec
2505 case elfcpp::R_386_TLS_LE_32
:
2508 case elfcpp::R_386_32
:
2509 case elfcpp::R_386_PC32
:
2510 case elfcpp::R_386_GOT32
:
2511 case elfcpp::R_386_PLT32
:
2512 case elfcpp::R_386_GOTOFF
:
2513 case elfcpp::R_386_GOTPC
:
2516 case elfcpp::R_386_16
:
2517 case elfcpp::R_386_PC16
:
2520 case elfcpp::R_386_8
:
2521 case elfcpp::R_386_PC8
:
2524 // These are relocations which should only be seen by the
2525 // dynamic linker, and should never be seen here.
2526 case elfcpp::R_386_COPY
:
2527 case elfcpp::R_386_GLOB_DAT
:
2528 case elfcpp::R_386_JUMP_SLOT
:
2529 case elfcpp::R_386_RELATIVE
:
2530 case elfcpp::R_386_TLS_TPOFF
:
2531 case elfcpp::R_386_TLS_DTPMOD32
:
2532 case elfcpp::R_386_TLS_DTPOFF32
:
2533 case elfcpp::R_386_TLS_TPOFF32
:
2534 case elfcpp::R_386_TLS_DESC
:
2535 object
->error(_("unexpected reloc %u in object file"), r_type
);
2538 case elfcpp::R_386_32PLT
:
2539 case elfcpp::R_386_TLS_GD_32
:
2540 case elfcpp::R_386_TLS_GD_PUSH
:
2541 case elfcpp::R_386_TLS_GD_CALL
:
2542 case elfcpp::R_386_TLS_GD_POP
:
2543 case elfcpp::R_386_TLS_LDM_32
:
2544 case elfcpp::R_386_TLS_LDM_PUSH
:
2545 case elfcpp::R_386_TLS_LDM_CALL
:
2546 case elfcpp::R_386_TLS_LDM_POP
:
2547 case elfcpp::R_386_USED_BY_INTEL_200
:
2549 object
->error(_("unsupported reloc %u in object file"), r_type
);
2554 // Scan the relocs during a relocatable link.
2557 Target_i386::scan_relocatable_relocs(const General_options
& options
,
2558 Symbol_table
* symtab
,
2560 Sized_relobj
<32, false>* object
,
2561 unsigned int data_shndx
,
2562 unsigned int sh_type
,
2563 const unsigned char* prelocs
,
2565 Output_section
* output_section
,
2566 bool needs_special_offset_handling
,
2567 size_t local_symbol_count
,
2568 const unsigned char* plocal_symbols
,
2569 Relocatable_relocs
* rr
)
2571 gold_assert(sh_type
== elfcpp::SHT_REL
);
2573 typedef gold::Default_scan_relocatable_relocs
<elfcpp::SHT_REL
,
2574 Relocatable_size_for_reloc
> Scan_relocatable_relocs
;
2576 gold::scan_relocatable_relocs
<32, false, elfcpp::SHT_REL
,
2577 Scan_relocatable_relocs
>(
2586 needs_special_offset_handling
,
2592 // Relocate a section during a relocatable link.
2595 Target_i386::relocate_for_relocatable(
2596 const Relocate_info
<32, false>* relinfo
,
2597 unsigned int sh_type
,
2598 const unsigned char* prelocs
,
2600 Output_section
* output_section
,
2601 off_t offset_in_output_section
,
2602 const Relocatable_relocs
* rr
,
2603 unsigned char* view
,
2604 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
2605 section_size_type view_size
,
2606 unsigned char* reloc_view
,
2607 section_size_type reloc_view_size
)
2609 gold_assert(sh_type
== elfcpp::SHT_REL
);
2611 gold::relocate_for_relocatable
<32, false, elfcpp::SHT_REL
>(
2616 offset_in_output_section
,
2625 // Return the value to use for a dynamic which requires special
2626 // treatment. This is how we support equality comparisons of function
2627 // pointers across shared library boundaries, as described in the
2628 // processor specific ABI supplement.
2631 Target_i386::do_dynsym_value(const Symbol
* gsym
) const
2633 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
2634 return this->plt_section()->address() + gsym
->plt_offset();
2637 // Return a string used to fill a code section with nops to take up
2638 // the specified length.
2641 Target_i386::do_code_fill(section_size_type length
) const
2645 // Build a jmp instruction to skip over the bytes.
2646 unsigned char jmp
[5];
2648 elfcpp::Swap_unaligned
<32, false>::writeval(jmp
+ 1, length
- 5);
2649 return (std::string(reinterpret_cast<char*>(&jmp
[0]), 5)
2650 + std::string(length
- 5, '\0'));
2653 // Nop sequences of various lengths.
2654 const char nop1
[1] = { 0x90 }; // nop
2655 const char nop2
[2] = { 0x66, 0x90 }; // xchg %ax %ax
2656 const char nop3
[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi
2657 const char nop4
[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi
2658 const char nop5
[5] = { 0x90, 0x8d, 0x74, 0x26, // nop
2659 0x00 }; // leal 0(%esi,1),%esi
2660 const char nop6
[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
2662 const char nop7
[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
2664 const char nop8
[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop
2665 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi
2666 const char nop9
[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi
2667 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi
2669 const char nop10
[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi
2670 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi
2672 const char nop11
[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi
2673 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi
2675 const char nop12
[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
2676 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi
2677 0x00, 0x00, 0x00, 0x00 };
2678 const char nop13
[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
2679 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi
2680 0x27, 0x00, 0x00, 0x00,
2682 const char nop14
[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
2683 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi
2684 0xbc, 0x27, 0x00, 0x00,
2686 const char nop15
[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15
2687 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,...
2688 0x90, 0x90, 0x90, 0x90,
2691 const char* nops
[16] = {
2693 nop1
, nop2
, nop3
, nop4
, nop5
, nop6
, nop7
,
2694 nop8
, nop9
, nop10
, nop11
, nop12
, nop13
, nop14
, nop15
2697 return std::string(nops
[length
], length
);
2700 // The selector for i386 object files.
2702 class Target_selector_i386
: public Target_selector_freebsd
2705 Target_selector_i386()
2706 : Target_selector_freebsd(elfcpp::EM_386
, 32, false,
2707 "elf32-i386", "elf32-i386-freebsd")
2711 do_instantiate_target()
2712 { return new Target_i386(); }
2715 Target_selector_i386 target_selector_i386
;
2717 } // End anonymous namespace.