1 // i386.cc -- i386 target support for gold.
3 // Copyright 2006, 2007 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"
36 #include "target-reloc.h"
37 #include "target-select.h"
44 class Output_data_plt_i386
;
46 // The i386 target class.
48 class Target_i386
: public Sized_target
<32, false>
51 typedef Output_data_reloc
<elfcpp::SHT_REL
, true, 32, false> Reloc_section
;
54 : Sized_target
<32, false>(&i386_info
),
55 got_(NULL
), plt_(NULL
), got_plt_(NULL
), rel_dyn_(NULL
),
56 copy_relocs_(NULL
), dynbss_(NULL
)
59 // Scan the relocations to look for symbol adjustments.
61 scan_relocs(const General_options
& options
,
64 Sized_relobj
<32, false>* object
,
65 unsigned int data_shndx
,
67 const unsigned char* prelocs
,
69 size_t local_symbol_count
,
70 const unsigned char* plocal_symbols
,
71 Symbol
** global_symbols
);
73 // Finalize the sections.
75 do_finalize_sections(Layout
*);
77 // Return the value to use for a dynamic which requires special
80 do_dynsym_value(const Symbol
*) const;
82 // Relocate a section.
84 relocate_section(const Relocate_info
<32, false>*,
86 const unsigned char* prelocs
,
89 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
92 // Return a string used to fill a code section with nops.
94 do_code_fill(off_t length
);
97 // The class which scans relocations.
101 local(const General_options
& options
, Symbol_table
* symtab
,
102 Layout
* layout
, Target_i386
* target
,
103 Sized_relobj
<32, false>* object
,
104 unsigned int data_shndx
,
105 const elfcpp::Rel
<32, false>& reloc
, unsigned int r_type
,
106 const elfcpp::Sym
<32, false>& lsym
);
109 global(const General_options
& options
, Symbol_table
* symtab
,
110 Layout
* layout
, Target_i386
* target
,
111 Sized_relobj
<32, false>* object
,
112 unsigned int data_shndx
,
113 const elfcpp::Rel
<32, false>& reloc
, unsigned int r_type
,
117 // The class which implements relocation.
122 : skip_call_tls_get_addr_(false)
127 if (this->skip_call_tls_get_addr_
)
129 // FIXME: This needs to specify the location somehow.
130 fprintf(stderr
, _("%s: missing expected TLS relocation\n"),
136 // Do a relocation. Return false if the caller should not issue
137 // any warnings about this relocation.
139 relocate(const Relocate_info
<32, false>*, Target_i386
*, size_t relnum
,
140 const elfcpp::Rel
<32, false>&,
141 unsigned int r_type
, const Sized_symbol
<32>*,
142 const Symbol_value
<32>*,
143 unsigned char*, elfcpp::Elf_types
<32>::Elf_Addr
,
147 // Do a TLS relocation.
149 relocate_tls(const Relocate_info
<32, false>*, size_t relnum
,
150 const elfcpp::Rel
<32, false>&,
151 unsigned int r_type
, const Sized_symbol
<32>*,
152 const Symbol_value
<32>*,
153 unsigned char*, elfcpp::Elf_types
<32>::Elf_Addr
, off_t
);
155 // Do a TLS Initial-Exec to Local-Exec transition.
157 tls_ie_to_le(const Relocate_info
<32, false>*, size_t relnum
,
158 Output_segment
* tls_segment
,
159 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
160 elfcpp::Elf_types
<32>::Elf_Addr value
,
164 // Do a TLS Global-Dynamic to Local-Exec transition.
166 tls_gd_to_le(const Relocate_info
<32, false>*, size_t relnum
,
167 Output_segment
* tls_segment
,
168 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
169 elfcpp::Elf_types
<32>::Elf_Addr value
,
173 // Check the range for a TLS relocation.
175 check_range(const Relocate_info
<32, false>*, size_t relnum
,
176 const elfcpp::Rel
<32, false>&, off_t
, off_t
);
178 // Check the validity of a TLS relocation. This is like assert.
180 check_tls(const Relocate_info
<32, false>*, size_t relnum
,
181 const elfcpp::Rel
<32, false>&, bool);
183 // This is set if we should skip the next reloc, which should be a
184 // PLT32 reloc against ___tls_get_addr.
185 bool skip_call_tls_get_addr_
;
188 // Adjust TLS relocation type based on the options and whether this
189 // is a local symbol.
191 optimize_tls_reloc(bool is_final
, int r_type
);
193 // Get the GOT section, creating it if necessary.
194 Output_data_got
<32, false>*
195 got_section(Symbol_table
*, Layout
*);
197 // Create a PLT entry for a global symbol.
199 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
201 // Get the PLT section.
202 Output_data_plt_i386
*
205 gold_assert(this->plt_
!= NULL
);
209 // Get the dynamic reloc section, creating it if necessary.
211 rel_dyn_section(Layout
*);
213 // Copy a relocation against a global symbol.
215 copy_reloc(const General_options
*, Symbol_table
*, Layout
*,
216 Sized_relobj
<32, false>*, unsigned int,
217 Symbol
*, const elfcpp::Rel
<32, false>&);
219 // Information about this specific target which we pass to the
220 // general Target structure.
221 static const Target::Target_info i386_info
;
224 Output_data_got
<32, false>* got_
;
226 Output_data_plt_i386
* plt_
;
227 // The GOT PLT section.
228 Output_data_space
* got_plt_
;
229 // The dynamic reloc section.
230 Reloc_section
* rel_dyn_
;
231 // Relocs saved to avoid a COPY reloc.
232 Copy_relocs
<32, false>* copy_relocs_
;
233 // Space for variables copied with a COPY reloc.
234 Output_data_space
* dynbss_
;
237 const Target::Target_info
Target_i386::i386_info
=
240 false, // is_big_endian
241 elfcpp::EM_386
, // machine_code
242 false, // has_make_symbol
243 false, // has_resolve
244 true, // has_code_fill
245 "/usr/lib/libc.so.1", // dynamic_linker
246 0x08048000, // text_segment_address
247 0x1000, // abi_pagesize
248 0x1000 // common_pagesize
251 // Get the GOT section, creating it if necessary.
253 Output_data_got
<32, false>*
254 Target_i386::got_section(Symbol_table
* symtab
, Layout
* layout
)
256 if (this->got_
== NULL
)
258 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
260 this->got_
= new Output_data_got
<32, false>();
262 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
263 elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
,
266 // The old GNU linker creates a .got.plt section. We just
267 // create another set of data in the .got section. Note that we
268 // always create a PLT if we create a GOT, although the PLT
270 this->got_plt_
= new Output_data_space(4);
271 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
272 elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
,
275 // The first three entries are reserved.
276 this->got_plt_
->set_space_size(3 * 4);
278 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
279 symtab
->define_in_output_data(this, "_GLOBAL_OFFSET_TABLE_", NULL
,
281 0, 0, elfcpp::STT_OBJECT
,
283 elfcpp::STV_HIDDEN
, 0,
290 // Get the dynamic reloc section, creating it if necessary.
292 Target_i386::Reloc_section
*
293 Target_i386::rel_dyn_section(Layout
* layout
)
295 if (this->rel_dyn_
== NULL
)
297 gold_assert(layout
!= NULL
);
298 this->rel_dyn_
= new Reloc_section();
299 layout
->add_output_section_data(".rel.dyn", elfcpp::SHT_REL
,
300 elfcpp::SHF_ALLOC
, this->rel_dyn_
);
302 return this->rel_dyn_
;
305 // A class to handle the PLT data.
307 class Output_data_plt_i386
: public Output_section_data
310 typedef Output_data_reloc
<elfcpp::SHT_REL
, true, 32, false> Reloc_section
;
312 Output_data_plt_i386(Layout
*, Output_data_space
*);
314 // Add an entry to the PLT.
316 add_entry(Symbol
* gsym
);
318 // Return the .rel.plt section data.
321 { return this->rel_
; }
325 do_adjust_output_section(Output_section
* os
);
328 // The size of an entry in the PLT.
329 static const int plt_entry_size
= 16;
331 // The first entry in the PLT for an executable.
332 static unsigned char exec_first_plt_entry
[plt_entry_size
];
334 // The first entry in the PLT for a shared object.
335 static unsigned char dyn_first_plt_entry
[plt_entry_size
];
337 // Other entries in the PLT for an executable.
338 static unsigned char exec_plt_entry
[plt_entry_size
];
340 // Other entries in the PLT for a shared object.
341 static unsigned char dyn_plt_entry
[plt_entry_size
];
343 // Set the final size.
345 do_set_address(uint64_t, off_t
)
346 { this->set_data_size((this->count_
+ 1) * plt_entry_size
); }
348 // Write out the PLT data.
350 do_write(Output_file
*);
352 // The reloc section.
354 // The .got.plt section.
355 Output_data_space
* got_plt_
;
356 // The number of PLT entries.
360 // Create the PLT section. The ordinary .got section is an argument,
361 // since we need to refer to the start. We also create our own .got
362 // section just for PLT entries.
364 Output_data_plt_i386::Output_data_plt_i386(Layout
* layout
,
365 Output_data_space
* got_plt
)
366 : Output_section_data(4), got_plt_(got_plt
), count_(0)
368 this->rel_
= new Reloc_section();
369 layout
->add_output_section_data(".rel.plt", elfcpp::SHT_REL
,
370 elfcpp::SHF_ALLOC
, this->rel_
);
376 Output_data_plt_i386::do_adjust_output_section(Output_section
* os
)
378 // UnixWare sets the entsize of .plt to 4, and so does the old GNU
379 // linker, and so do we.
383 // Add an entry to the PLT.
386 Output_data_plt_i386::add_entry(Symbol
* gsym
)
388 gold_assert(!gsym
->has_plt_offset());
390 // Note that when setting the PLT offset we skip the initial
391 // reserved PLT entry.
392 gsym
->set_plt_offset((this->count_
+ 1) * plt_entry_size
);
396 off_t got_offset
= this->got_plt_
->data_size();
398 // Every PLT entry needs a GOT entry which points back to the PLT
399 // entry (this will be changed by the dynamic linker, normally
400 // lazily when the function is called).
401 this->got_plt_
->set_space_size(got_offset
+ 4);
403 // Every PLT entry needs a reloc.
404 gsym
->set_needs_dynsym_entry();
405 this->rel_
->add_global(gsym
, elfcpp::R_386_JUMP_SLOT
, this->got_plt_
,
408 // Note that we don't need to save the symbol. The contents of the
409 // PLT are independent of which symbols are used. The symbols only
410 // appear in the relocations.
413 // The first entry in the PLT for an executable.
415 unsigned char Output_data_plt_i386::exec_first_plt_entry
[plt_entry_size
] =
417 0xff, 0x35, // pushl contents of memory address
418 0, 0, 0, 0, // replaced with address of .got + 4
419 0xff, 0x25, // jmp indirect
420 0, 0, 0, 0, // replaced with address of .got + 8
424 // The first entry in the PLT for a shared object.
426 unsigned char Output_data_plt_i386::dyn_first_plt_entry
[plt_entry_size
] =
428 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx)
429 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx)
433 // Subsequent entries in the PLT for an executable.
435 unsigned char Output_data_plt_i386::exec_plt_entry
[plt_entry_size
] =
437 0xff, 0x25, // jmp indirect
438 0, 0, 0, 0, // replaced with address of symbol in .got
439 0x68, // pushl immediate
440 0, 0, 0, 0, // replaced with offset into relocation table
441 0xe9, // jmp relative
442 0, 0, 0, 0 // replaced with offset to start of .plt
445 // Subsequent entries in the PLT for a shared object.
447 unsigned char Output_data_plt_i386::dyn_plt_entry
[plt_entry_size
] =
449 0xff, 0xa3, // jmp *offset(%ebx)
450 0, 0, 0, 0, // replaced with offset of symbol in .got
451 0x68, // pushl immediate
452 0, 0, 0, 0, // replaced with offset into relocation table
453 0xe9, // jmp relative
454 0, 0, 0, 0 // replaced with offset to start of .plt
457 // Write out the PLT. This uses the hand-coded instructions above,
458 // and adjusts them as needed. This is all specified by the i386 ELF
459 // Processor Supplement.
462 Output_data_plt_i386::do_write(Output_file
* of
)
464 const off_t offset
= this->offset();
465 const off_t oview_size
= this->data_size();
466 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
468 const off_t got_file_offset
= this->got_plt_
->offset();
469 const off_t got_size
= this->got_plt_
->data_size();
470 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
473 unsigned char* pov
= oview
;
475 elfcpp::Elf_types
<32>::Elf_Addr plt_address
= this->address();
476 elfcpp::Elf_types
<32>::Elf_Addr got_address
= this->got_plt_
->address();
478 if (parameters
->output_is_shared())
479 memcpy(pov
, dyn_first_plt_entry
, plt_entry_size
);
482 memcpy(pov
, exec_first_plt_entry
, plt_entry_size
);
483 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2, got_address
+ 4);
484 elfcpp::Swap
<32, false>::writeval(pov
+ 8, got_address
+ 8);
486 pov
+= plt_entry_size
;
488 unsigned char* got_pov
= got_view
;
490 memset(got_pov
, 0, 12);
493 const int rel_size
= elfcpp::Elf_sizes
<32>::rel_size
;
495 unsigned int plt_offset
= plt_entry_size
;
496 unsigned int plt_rel_offset
= 0;
497 unsigned int got_offset
= 12;
498 const unsigned int count
= this->count_
;
499 for (unsigned int i
= 0;
502 pov
+= plt_entry_size
,
504 plt_offset
+= plt_entry_size
,
505 plt_rel_offset
+= rel_size
,
508 // Set and adjust the PLT entry itself.
510 if (parameters
->output_is_shared())
512 memcpy(pov
, dyn_plt_entry
, plt_entry_size
);
513 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2, got_offset
);
517 memcpy(pov
, exec_plt_entry
, plt_entry_size
);
518 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
523 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 7, plt_rel_offset
);
524 elfcpp::Swap
<32, false>::writeval(pov
+ 12,
525 - (plt_offset
+ plt_entry_size
));
527 // Set the entry in the GOT.
528 elfcpp::Swap
<32, false>::writeval(got_pov
, plt_address
+ plt_offset
+ 6);
531 gold_assert(pov
- oview
== oview_size
);
532 gold_assert(got_pov
- got_view
== got_size
);
534 of
->write_output_view(offset
, oview_size
, oview
);
535 of
->write_output_view(got_file_offset
, got_size
, got_view
);
538 // Create a PLT entry for a global symbol.
541 Target_i386::make_plt_entry(Symbol_table
* symtab
, Layout
* layout
, Symbol
* gsym
)
543 if (gsym
->has_plt_offset())
546 if (this->plt_
== NULL
)
548 // Create the GOT sections first.
549 this->got_section(symtab
, layout
);
551 this->plt_
= new Output_data_plt_i386(layout
, this->got_plt_
);
552 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
554 | elfcpp::SHF_EXECINSTR
),
558 this->plt_
->add_entry(gsym
);
561 // Handle a relocation against a non-function symbol defined in a
562 // dynamic object. The traditional way to handle this is to generate
563 // a COPY relocation to copy the variable at runtime from the shared
564 // object into the executable's data segment. However, this is
565 // undesirable in general, as if the size of the object changes in the
566 // dynamic object, the executable will no longer work correctly. If
567 // this relocation is in a writable section, then we can create a
568 // dynamic reloc and the dynamic linker will resolve it to the correct
569 // address at runtime. However, we do not want do that if the
570 // relocation is in a read-only section, as it would prevent the
571 // readonly segment from being shared. And if we have to eventually
572 // generate a COPY reloc, then any dynamic relocations will be
573 // useless. So this means that if this is a writable section, we need
574 // to save the relocation until we see whether we have to create a
575 // COPY relocation for this symbol for any other relocation.
578 Target_i386::copy_reloc(const General_options
* options
,
579 Symbol_table
* symtab
,
581 Sized_relobj
<32, false>* object
,
582 unsigned int data_shndx
, Symbol
* gsym
,
583 const elfcpp::Rel
<32, false>& rel
)
585 Sized_symbol
<32>* ssym
;
586 ssym
= symtab
->get_sized_symbol
SELECT_SIZE_NAME(32) (gsym
589 if (!Copy_relocs
<32, false>::need_copy_reloc(options
, object
,
592 // So far we do not need a COPY reloc. Save this relocation.
593 // If it turns out that we never need a COPY reloc for this
594 // symbol, then we will emit the relocation.
595 if (this->copy_relocs_
== NULL
)
596 this->copy_relocs_
= new Copy_relocs
<32, false>();
597 this->copy_relocs_
->save(ssym
, object
, data_shndx
, rel
);
601 // Allocate space for this symbol in the .bss section.
603 elfcpp::Elf_types
<32>::Elf_WXword symsize
= ssym
->symsize();
605 // There is no defined way to determine the required alignment
606 // of the symbol. We pick the alignment based on the size. We
607 // set an arbitrary maximum of 256.
609 for (align
= 1; align
< 512; align
<<= 1)
610 if ((symsize
& align
) != 0)
613 if (this->dynbss_
== NULL
)
615 this->dynbss_
= new Output_data_space(align
);
616 layout
->add_output_section_data(".bss",
619 | elfcpp::SHF_WRITE
),
623 Output_data_space
* dynbss
= this->dynbss_
;
625 if (align
> dynbss
->addralign())
626 dynbss
->set_space_alignment(align
);
628 off_t dynbss_size
= dynbss
->data_size();
629 dynbss_size
= align_address(dynbss_size
, align
);
630 off_t offset
= dynbss_size
;
631 dynbss
->set_space_size(dynbss_size
+ symsize
);
633 // Define the symbol in the .dynbss section.
634 symtab
->define_in_output_data(this, ssym
->name(), ssym
->version(),
635 dynbss
, offset
, symsize
, ssym
->type(),
636 ssym
->binding(), ssym
->visibility(),
637 ssym
->nonvis(), false, false);
639 // Add the COPY reloc.
640 ssym
->set_needs_dynsym_entry();
641 Reloc_section
* rel_dyn
= this->rel_dyn_section(layout
);
642 rel_dyn
->add_global(ssym
, elfcpp::R_386_COPY
, dynbss
, offset
);
646 // Optimize the TLS relocation type based on what we know about the
647 // symbol. IS_FINAL is true if the final address of this symbol is
648 // known at link time.
651 Target_i386::optimize_tls_reloc(bool is_final
, int r_type
)
653 // If we are generating a shared library, then we can't do anything
655 if (parameters
->output_is_shared())
660 case elfcpp::R_386_TLS_GD
:
661 case elfcpp::R_386_TLS_GOTDESC
:
662 case elfcpp::R_386_TLS_DESC_CALL
:
663 // These are Global-Dynamic which permits fully general TLS
664 // access. Since we know that we are generating an executable,
665 // we can convert this to Initial-Exec. If we also know that
666 // this is a local symbol, we can further switch to Local-Exec.
668 return elfcpp::R_386_TLS_LE_32
;
669 return elfcpp::R_386_TLS_IE_32
;
671 case elfcpp::R_386_TLS_LDM
:
672 // This is Local-Dynamic, which refers to a local symbol in the
673 // dynamic TLS block. Since we know that we generating an
674 // executable, we can switch to Local-Exec.
675 return elfcpp::R_386_TLS_LE_32
;
677 case elfcpp::R_386_TLS_LDO_32
:
678 // Another type of Local-Dynamic relocation.
679 return elfcpp::R_386_TLS_LE
;
681 case elfcpp::R_386_TLS_IE
:
682 case elfcpp::R_386_TLS_GOTIE
:
683 case elfcpp::R_386_TLS_IE_32
:
684 // These are Initial-Exec relocs which get the thread offset
685 // from the GOT. If we know that we are linking against the
686 // local symbol, we can switch to Local-Exec, which links the
687 // thread offset into the instruction.
689 return elfcpp::R_386_TLS_LE_32
;
692 case elfcpp::R_386_TLS_LE
:
693 case elfcpp::R_386_TLS_LE_32
:
694 // When we already have Local-Exec, there is nothing further we
703 // Scan a relocation for a local symbol.
706 Target_i386::Scan::local(const General_options
&,
707 Symbol_table
* symtab
,
710 Sized_relobj
<32, false>* object
,
712 const elfcpp::Rel
<32, false>&,
714 const elfcpp::Sym
<32, false>&)
718 case elfcpp::R_386_NONE
:
719 case elfcpp::R_386_GNU_VTINHERIT
:
720 case elfcpp::R_386_GNU_VTENTRY
:
723 case elfcpp::R_386_32
:
724 case elfcpp::R_386_16
:
725 case elfcpp::R_386_8
:
726 // FIXME: If we are generating a shared object we need to copy
727 // this relocation into the object.
728 gold_assert(!parameters
->output_is_shared());
731 case elfcpp::R_386_PC32
:
732 case elfcpp::R_386_PC16
:
733 case elfcpp::R_386_PC8
:
736 case elfcpp::R_386_GOTOFF
:
737 case elfcpp::R_386_GOTPC
:
738 // We need a GOT section.
739 target
->got_section(symtab
, layout
);
742 case elfcpp::R_386_COPY
:
743 case elfcpp::R_386_GLOB_DAT
:
744 case elfcpp::R_386_JUMP_SLOT
:
745 case elfcpp::R_386_RELATIVE
:
746 case elfcpp::R_386_TLS_TPOFF
:
747 case elfcpp::R_386_TLS_DTPMOD32
:
748 case elfcpp::R_386_TLS_DTPOFF32
:
749 case elfcpp::R_386_TLS_TPOFF32
:
750 case elfcpp::R_386_TLS_DESC
:
751 fprintf(stderr
, _("%s: %s: unexpected reloc %u in object file\n"),
752 program_name
, object
->name().c_str(), r_type
);
756 case elfcpp::R_386_TLS_IE
:
757 case elfcpp::R_386_TLS_GOTIE
:
758 case elfcpp::R_386_TLS_LE
:
759 case elfcpp::R_386_TLS_GD
:
760 case elfcpp::R_386_TLS_LDM
:
761 case elfcpp::R_386_TLS_LDO_32
:
762 case elfcpp::R_386_TLS_IE_32
:
763 case elfcpp::R_386_TLS_LE_32
:
764 case elfcpp::R_386_TLS_GOTDESC
:
765 case elfcpp::R_386_TLS_DESC_CALL
:
767 bool output_is_shared
= parameters
->output_is_shared();
768 r_type
= Target_i386::optimize_tls_reloc(!output_is_shared
,
772 case elfcpp::R_386_TLS_LE
:
773 case elfcpp::R_386_TLS_LE_32
:
774 // FIXME: If generating a shared object, we need to copy
775 // this relocation into the object.
776 gold_assert(!output_is_shared
);
779 case elfcpp::R_386_TLS_IE
:
780 case elfcpp::R_386_TLS_GOTIE
:
781 case elfcpp::R_386_TLS_GD
:
782 case elfcpp::R_386_TLS_LDM
:
783 case elfcpp::R_386_TLS_LDO_32
:
784 case elfcpp::R_386_TLS_IE_32
:
785 case elfcpp::R_386_TLS_GOTDESC
:
786 case elfcpp::R_386_TLS_DESC_CALL
:
788 _("%s: %s: unsupported reloc %u against local symbol\n"),
789 program_name
, object
->name().c_str(), r_type
);
795 case elfcpp::R_386_GOT32
:
796 case elfcpp::R_386_PLT32
:
797 case elfcpp::R_386_32PLT
:
798 case elfcpp::R_386_TLS_GD_32
:
799 case elfcpp::R_386_TLS_GD_PUSH
:
800 case elfcpp::R_386_TLS_GD_CALL
:
801 case elfcpp::R_386_TLS_GD_POP
:
802 case elfcpp::R_386_TLS_LDM_32
:
803 case elfcpp::R_386_TLS_LDM_PUSH
:
804 case elfcpp::R_386_TLS_LDM_CALL
:
805 case elfcpp::R_386_TLS_LDM_POP
:
806 case elfcpp::R_386_USED_BY_INTEL_200
:
808 fprintf(stderr
, _("%s: %s: unsupported reloc %u against local symbol\n"),
809 program_name
, object
->name().c_str(), r_type
);
814 // Scan a relocation for a global symbol.
817 Target_i386::Scan::global(const General_options
& options
,
818 Symbol_table
* symtab
,
821 Sized_relobj
<32, false>* object
,
822 unsigned int data_shndx
,
823 const elfcpp::Rel
<32, false>& reloc
,
829 case elfcpp::R_386_NONE
:
830 case elfcpp::R_386_GNU_VTINHERIT
:
831 case elfcpp::R_386_GNU_VTENTRY
:
834 case elfcpp::R_386_32
:
835 case elfcpp::R_386_PC32
:
836 case elfcpp::R_386_16
:
837 case elfcpp::R_386_PC16
:
838 case elfcpp::R_386_8
:
839 case elfcpp::R_386_PC8
:
840 // FIXME: If we are generating a shared object we may need to
841 // copy this relocation into the object. If this symbol is
842 // defined in a shared object, we may need to copy this
843 // relocation in order to avoid a COPY relocation.
844 gold_assert(!parameters
->output_is_shared());
846 if (gsym
->is_from_dynobj())
848 // This symbol is defined in a dynamic object. If it is a
849 // function, we make a PLT entry. Otherwise we need to
850 // either generate a COPY reloc or copy this reloc.
851 if (gsym
->type() == elfcpp::STT_FUNC
)
853 target
->make_plt_entry(symtab
, layout
, gsym
);
855 // If this is not a PC relative reference, then we may
856 // be taking the address of the function. In that case
857 // we need to set the entry in the dynamic symbol table
858 // to the address of the PLT entry.
859 if (r_type
!= elfcpp::R_386_PC32
860 && r_type
!= elfcpp::R_386_PC16
861 && r_type
!= elfcpp::R_386_PC8
)
862 gsym
->set_needs_dynsym_value();
865 target
->copy_reloc(&options
, symtab
, layout
, object
, data_shndx
,
871 case elfcpp::R_386_GOT32
:
873 // The symbol requires a GOT entry.
874 Output_data_got
<32, false>* got
= target
->got_section(symtab
, layout
);
875 if (got
->add_global(gsym
))
877 // If this symbol is not fully resolved, we need to add a
878 // dynamic relocation for it.
879 if (!gsym
->final_value_is_known())
881 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
882 rel_dyn
->add_global(gsym
, elfcpp::R_386_GLOB_DAT
, got
,
889 case elfcpp::R_386_PLT32
:
890 // If the symbol is fully resolved, this is just a PC32 reloc.
891 // Otherwise we need a PLT entry.
892 if (gsym
->final_value_is_known())
894 target
->make_plt_entry(symtab
, layout
, gsym
);
897 case elfcpp::R_386_GOTOFF
:
898 case elfcpp::R_386_GOTPC
:
899 // We need a GOT section.
900 target
->got_section(symtab
, layout
);
903 case elfcpp::R_386_COPY
:
904 case elfcpp::R_386_GLOB_DAT
:
905 case elfcpp::R_386_JUMP_SLOT
:
906 case elfcpp::R_386_RELATIVE
:
907 case elfcpp::R_386_TLS_TPOFF
:
908 case elfcpp::R_386_TLS_DTPMOD32
:
909 case elfcpp::R_386_TLS_DTPOFF32
:
910 case elfcpp::R_386_TLS_TPOFF32
:
911 case elfcpp::R_386_TLS_DESC
:
912 fprintf(stderr
, _("%s: %s: unexpected reloc %u in object file\n"),
913 program_name
, object
->name().c_str(), r_type
);
917 case elfcpp::R_386_TLS_IE
:
918 case elfcpp::R_386_TLS_GOTIE
:
919 case elfcpp::R_386_TLS_LE
:
920 case elfcpp::R_386_TLS_GD
:
921 case elfcpp::R_386_TLS_LDM
:
922 case elfcpp::R_386_TLS_LDO_32
:
923 case elfcpp::R_386_TLS_IE_32
:
924 case elfcpp::R_386_TLS_LE_32
:
925 case elfcpp::R_386_TLS_GOTDESC
:
926 case elfcpp::R_386_TLS_DESC_CALL
:
928 const bool is_final
= gsym
->final_value_is_known();
929 r_type
= Target_i386::optimize_tls_reloc(is_final
, r_type
);
932 case elfcpp::R_386_TLS_LE
:
933 case elfcpp::R_386_TLS_LE_32
:
934 // FIXME: If generating a shared object, we need to copy
935 // this relocation into the object.
936 gold_assert(!parameters
->output_is_shared());
939 case elfcpp::R_386_TLS_IE
:
940 case elfcpp::R_386_TLS_GOTIE
:
941 case elfcpp::R_386_TLS_GD
:
942 case elfcpp::R_386_TLS_LDM
:
943 case elfcpp::R_386_TLS_LDO_32
:
944 case elfcpp::R_386_TLS_IE_32
:
945 case elfcpp::R_386_TLS_GOTDESC
:
946 case elfcpp::R_386_TLS_DESC_CALL
:
948 _("%s: %s: unsupported reloc %u "
949 "against global symbol %s\n"),
950 program_name
, object
->name().c_str(), r_type
,
957 case elfcpp::R_386_32PLT
:
958 case elfcpp::R_386_TLS_GD_32
:
959 case elfcpp::R_386_TLS_GD_PUSH
:
960 case elfcpp::R_386_TLS_GD_CALL
:
961 case elfcpp::R_386_TLS_GD_POP
:
962 case elfcpp::R_386_TLS_LDM_32
:
963 case elfcpp::R_386_TLS_LDM_PUSH
:
964 case elfcpp::R_386_TLS_LDM_CALL
:
965 case elfcpp::R_386_TLS_LDM_POP
:
966 case elfcpp::R_386_USED_BY_INTEL_200
:
969 _("%s: %s: unsupported reloc %u against global symbol %s\n"),
970 program_name
, object
->name().c_str(), r_type
, gsym
->name());
975 // Scan relocations for a section.
978 Target_i386::scan_relocs(const General_options
& options
,
979 Symbol_table
* symtab
,
981 Sized_relobj
<32, false>* object
,
982 unsigned int data_shndx
,
983 unsigned int sh_type
,
984 const unsigned char* prelocs
,
986 size_t local_symbol_count
,
987 const unsigned char* plocal_symbols
,
988 Symbol
** global_symbols
)
990 if (sh_type
== elfcpp::SHT_RELA
)
992 fprintf(stderr
, _("%s: %s: unsupported RELA reloc section\n"),
993 program_name
, object
->name().c_str());
997 gold::scan_relocs
<32, false, Target_i386
, elfcpp::SHT_REL
,
1012 // Finalize the sections.
1015 Target_i386::do_finalize_sections(Layout
* layout
)
1017 // Fill in some more dynamic tags.
1018 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
1021 if (this->got_plt_
!= NULL
)
1022 odyn
->add_section_address(elfcpp::DT_PLTGOT
, this->got_plt_
);
1024 if (this->plt_
!= NULL
)
1026 const Output_data
* od
= this->plt_
->rel_plt();
1027 odyn
->add_section_size(elfcpp::DT_PLTRELSZ
, od
);
1028 odyn
->add_section_address(elfcpp::DT_JMPREL
, od
);
1029 odyn
->add_constant(elfcpp::DT_PLTREL
, elfcpp::DT_REL
);
1032 if (this->rel_dyn_
!= NULL
)
1034 const Output_data
* od
= this->rel_dyn_
;
1035 odyn
->add_section_address(elfcpp::DT_REL
, od
);
1036 odyn
->add_section_size(elfcpp::DT_RELSZ
, od
);
1037 odyn
->add_constant(elfcpp::DT_RELENT
,
1038 elfcpp::Elf_sizes
<32>::rel_size
);
1041 if (!parameters
->output_is_shared())
1043 // The value of the DT_DEBUG tag is filled in by the dynamic
1044 // linker at run time, and used by the debugger.
1045 odyn
->add_constant(elfcpp::DT_DEBUG
, 0);
1049 // Emit any relocs we saved in an attempt to avoid generating COPY
1051 if (this->copy_relocs_
== NULL
)
1053 if (this->copy_relocs_
->any_to_emit())
1055 Reloc_section
* rel_dyn
= this->rel_dyn_section(layout
);
1056 this->copy_relocs_
->emit(rel_dyn
);
1058 delete this->copy_relocs_
;
1059 this->copy_relocs_
= NULL
;
1062 // Perform a relocation.
1065 Target_i386::Relocate::relocate(const Relocate_info
<32, false>* relinfo
,
1066 Target_i386
* target
,
1068 const elfcpp::Rel
<32, false>& rel
,
1069 unsigned int r_type
,
1070 const Sized_symbol
<32>* gsym
,
1071 const Symbol_value
<32>* psymval
,
1072 unsigned char* view
,
1073 elfcpp::Elf_types
<32>::Elf_Addr address
,
1076 if (this->skip_call_tls_get_addr_
)
1078 if (r_type
!= elfcpp::R_386_PLT32
1080 || strcmp(gsym
->name(), "___tls_get_addr") != 0)
1082 fprintf(stderr
, _("%s: %s: missing expected TLS relocation\n"),
1084 relinfo
->location(relnum
, rel
.get_r_offset()).c_str());
1088 this->skip_call_tls_get_addr_
= false;
1093 // Pick the value to use for symbols defined in shared objects.
1094 Symbol_value
<32> symval
;
1095 if (gsym
!= NULL
&& gsym
->is_from_dynobj() && gsym
->has_plt_offset())
1097 symval
.set_output_value(target
->plt_section()->address()
1098 + gsym
->plt_offset());
1102 const Sized_relobj
<32, false>* object
= relinfo
->object
;
1106 case elfcpp::R_386_NONE
:
1107 case elfcpp::R_386_GNU_VTINHERIT
:
1108 case elfcpp::R_386_GNU_VTENTRY
:
1111 case elfcpp::R_386_32
:
1112 Relocate_functions
<32, false>::rel32(view
, object
, psymval
);
1115 case elfcpp::R_386_PC32
:
1116 Relocate_functions
<32, false>::pcrel32(view
, object
, psymval
, address
);
1119 case elfcpp::R_386_16
:
1120 Relocate_functions
<32, false>::rel16(view
, object
, psymval
);
1123 case elfcpp::R_386_PC16
:
1124 Relocate_functions
<32, false>::pcrel16(view
, object
, psymval
, address
);
1127 case elfcpp::R_386_8
:
1128 Relocate_functions
<32, false>::rel8(view
, object
, psymval
);
1131 case elfcpp::R_386_PC8
:
1132 Relocate_functions
<32, false>::pcrel8(view
, object
, psymval
, address
);
1135 case elfcpp::R_386_PLT32
:
1136 gold_assert(gsym
->has_plt_offset()
1137 || gsym
->final_value_is_known());
1138 Relocate_functions
<32, false>::pcrel32(view
, object
, psymval
, address
);
1141 case elfcpp::R_386_GOT32
:
1142 // Local GOT offsets not yet supported.
1144 gold_assert(gsym
->has_got_offset());
1145 Relocate_functions
<32, false>::rel32(view
, gsym
->got_offset());
1148 case elfcpp::R_386_GOTOFF
:
1150 elfcpp::Elf_types
<32>::Elf_Addr value
;
1151 value
= (psymval
->value(object
, 0)
1152 - target
->got_section(NULL
, NULL
)->address());
1153 Relocate_functions
<32, false>::rel32(view
, value
);
1157 case elfcpp::R_386_GOTPC
:
1159 elfcpp::Elf_types
<32>::Elf_Addr value
;
1160 value
= target
->got_section(NULL
, NULL
)->address();
1161 Relocate_functions
<32, false>::pcrel32(view
, value
, address
);
1165 case elfcpp::R_386_COPY
:
1166 case elfcpp::R_386_GLOB_DAT
:
1167 case elfcpp::R_386_JUMP_SLOT
:
1168 case elfcpp::R_386_RELATIVE
:
1169 case elfcpp::R_386_TLS_TPOFF
:
1170 case elfcpp::R_386_TLS_DTPMOD32
:
1171 case elfcpp::R_386_TLS_DTPOFF32
:
1172 case elfcpp::R_386_TLS_TPOFF32
:
1173 case elfcpp::R_386_TLS_DESC
:
1174 fprintf(stderr
, _("%s: %s: unexpected reloc %u in object file\n"),
1176 relinfo
->location(relnum
, rel
.get_r_offset()).c_str(),
1181 case elfcpp::R_386_TLS_IE
:
1182 case elfcpp::R_386_TLS_GOTIE
:
1183 case elfcpp::R_386_TLS_LE
:
1184 case elfcpp::R_386_TLS_GD
:
1185 case elfcpp::R_386_TLS_LDM
:
1186 case elfcpp::R_386_TLS_LDO_32
:
1187 case elfcpp::R_386_TLS_IE_32
:
1188 case elfcpp::R_386_TLS_LE_32
:
1189 case elfcpp::R_386_TLS_GOTDESC
:
1190 case elfcpp::R_386_TLS_DESC_CALL
:
1191 this->relocate_tls(relinfo
, relnum
, rel
, r_type
, gsym
, psymval
, view
,
1192 address
, view_size
);
1195 case elfcpp::R_386_32PLT
:
1196 case elfcpp::R_386_TLS_GD_32
:
1197 case elfcpp::R_386_TLS_GD_PUSH
:
1198 case elfcpp::R_386_TLS_GD_CALL
:
1199 case elfcpp::R_386_TLS_GD_POP
:
1200 case elfcpp::R_386_TLS_LDM_32
:
1201 case elfcpp::R_386_TLS_LDM_PUSH
:
1202 case elfcpp::R_386_TLS_LDM_CALL
:
1203 case elfcpp::R_386_TLS_LDM_POP
:
1204 case elfcpp::R_386_USED_BY_INTEL_200
:
1206 fprintf(stderr
, _("%s: %s: unsupported reloc %u\n"),
1208 relinfo
->location(relnum
, rel
.get_r_offset()).c_str(),
1210 // gold_exit(false);
1217 // Perform a TLS relocation.
1220 Target_i386::Relocate::relocate_tls(const Relocate_info
<32, false>* relinfo
,
1222 const elfcpp::Rel
<32, false>& rel
,
1223 unsigned int r_type
,
1224 const Sized_symbol
<32>* gsym
,
1225 const Symbol_value
<32>* psymval
,
1226 unsigned char* view
,
1227 elfcpp::Elf_types
<32>::Elf_Addr
,
1230 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
1231 if (tls_segment
== NULL
)
1233 fprintf(stderr
, _("%s: %s: TLS reloc but no TLS segment\n"),
1235 relinfo
->location(relnum
, rel
.get_r_offset()).c_str());
1239 elfcpp::Elf_types
<32>::Elf_Addr value
= psymval
->value(relinfo
->object
, 0);
1241 const bool is_final
= (gsym
== NULL
1242 ? !parameters
->output_is_shared()
1243 : gsym
->final_value_is_known());
1244 const unsigned int opt_r_type
=
1245 Target_i386::optimize_tls_reloc(is_final
, r_type
);
1248 case elfcpp::R_386_TLS_LE_32
:
1249 value
= tls_segment
->vaddr() + tls_segment
->memsz() - value
;
1250 Relocate_functions
<32, false>::rel32(view
, value
);
1253 case elfcpp::R_386_TLS_LE
:
1254 value
= value
- (tls_segment
->vaddr() + tls_segment
->memsz());
1255 Relocate_functions
<32, false>::rel32(view
, value
);
1258 case elfcpp::R_386_TLS_IE
:
1259 case elfcpp::R_386_TLS_GOTIE
:
1260 case elfcpp::R_386_TLS_IE_32
:
1261 if (opt_r_type
== elfcpp::R_386_TLS_LE_32
)
1263 Target_i386::Relocate::tls_ie_to_le(relinfo
, relnum
, tls_segment
,
1264 rel
, r_type
, value
, view
,
1268 fprintf(stderr
, _("%s: %s: unsupported reloc type %u\n"),
1270 relinfo
->location(relnum
, rel
.get_r_offset()).c_str(),
1272 // gold_exit(false);
1275 case elfcpp::R_386_TLS_GD
:
1276 if (opt_r_type
== elfcpp::R_386_TLS_LE_32
)
1278 this->tls_gd_to_le(relinfo
, relnum
, tls_segment
,
1279 rel
, r_type
, value
, view
,
1283 fprintf(stderr
, _("%s: %s: unsupported reloc %u\n"),
1285 relinfo
->location(relnum
, rel
.get_r_offset()).c_str(),
1287 // gold_exit(false);
1290 case elfcpp::R_386_TLS_LDM
:
1291 case elfcpp::R_386_TLS_LDO_32
:
1292 case elfcpp::R_386_TLS_GOTDESC
:
1293 case elfcpp::R_386_TLS_DESC_CALL
:
1294 fprintf(stderr
, _("%s: %s: unsupported reloc %u\n"),
1296 relinfo
->location(relnum
, rel
.get_r_offset()).c_str(),
1298 // gold_exit(false);
1303 // Do a relocation in which we convert a TLS Initial-Exec to a
1307 Target_i386::Relocate::tls_ie_to_le(const Relocate_info
<32, false>* relinfo
,
1309 Output_segment
* tls_segment
,
1310 const elfcpp::Rel
<32, false>& rel
,
1311 unsigned int r_type
,
1312 elfcpp::Elf_types
<32>::Elf_Addr value
,
1313 unsigned char* view
,
1316 // We have to actually change the instructions, which means that we
1317 // need to examine the opcodes to figure out which instruction we
1319 if (r_type
== elfcpp::R_386_TLS_IE
)
1321 // movl %gs:XX,%eax ==> movl $YY,%eax
1322 // movl %gs:XX,%reg ==> movl $YY,%reg
1323 // addl %gs:XX,%reg ==> addl $YY,%reg
1324 Target_i386::Relocate::check_range(relinfo
, relnum
, rel
, view_size
, -1);
1325 Target_i386::Relocate::check_range(relinfo
, relnum
, rel
, view_size
, 4);
1327 unsigned char op1
= view
[-1];
1330 // movl XX,%eax ==> movl $YY,%eax
1335 Target_i386::Relocate::check_range(relinfo
, relnum
, rel
,
1338 unsigned char op2
= view
[-2];
1341 // movl XX,%reg ==> movl $YY,%reg
1342 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
,
1343 (op1
& 0xc7) == 0x05);
1345 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
1347 else if (op2
== 0x03)
1349 // addl XX,%reg ==> addl $YY,%reg
1350 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
,
1351 (op1
& 0xc7) == 0x05);
1353 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
1356 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
, 0);
1361 // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
1362 // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
1363 // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
1364 Target_i386::Relocate::check_range(relinfo
, relnum
, rel
, view_size
, -2);
1365 Target_i386::Relocate::check_range(relinfo
, relnum
, rel
, view_size
, 4);
1367 unsigned char op1
= view
[-1];
1368 unsigned char op2
= view
[-2];
1369 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
,
1370 (op1
& 0xc0) == 0x80 && (op1
& 7) != 4);
1373 // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
1375 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
1377 else if (op2
== 0x2b)
1379 // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
1381 view
[-1] = 0xe8 | ((op1
>> 3) & 7);
1383 else if (op2
== 0x03)
1385 // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
1387 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
1390 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
, 0);
1393 value
= tls_segment
->vaddr() + tls_segment
->memsz() - value
;
1394 if (r_type
== elfcpp::R_386_TLS_IE
|| r_type
== elfcpp::R_386_TLS_GOTIE
)
1397 Relocate_functions
<32, false>::rel32(view
, value
);
1400 // Do a relocation in which we convert a TLS Global-Dynamic to a
1404 Target_i386::Relocate::tls_gd_to_le(const Relocate_info
<32, false>* relinfo
,
1406 Output_segment
* tls_segment
,
1407 const elfcpp::Rel
<32, false>& rel
,
1409 elfcpp::Elf_types
<32>::Elf_Addr value
,
1410 unsigned char* view
,
1413 // leal foo(,%reg,1),%eax; call ___tls_get_addr
1414 // ==> movl %gs,0,%eax; subl $foo@tpoff,%eax
1415 // leal foo(%reg),%eax; call ___tls_get_addr
1416 // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
1418 Target_i386::Relocate::check_range(relinfo
, relnum
, rel
, view_size
, -2);
1419 Target_i386::Relocate::check_range(relinfo
, relnum
, rel
, view_size
, 9);
1421 unsigned char op1
= view
[-1];
1422 unsigned char op2
= view
[-2];
1424 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
,
1425 op2
== 0x8d || op2
== 0x04);
1426 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
,
1433 Target_i386::Relocate::check_range(relinfo
, relnum
, rel
, view_size
, -3);
1434 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
,
1436 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
,
1437 ((op1
& 0xc7) == 0x05
1438 && op1
!= (4 << 3)));
1439 memcpy(view
- 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
1443 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
,
1444 (op1
& 0xf8) == 0x80 && (op1
& 7) != 4);
1445 if (rel
.get_r_offset() + 9 < view_size
&& view
[9] == 0x90)
1447 // There is a trailing nop. Use the size byte subl.
1448 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
1453 // Use the five byte subl.
1454 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
1458 value
= tls_segment
->vaddr() + tls_segment
->memsz() - value
;
1459 Relocate_functions
<32, false>::rel32(view
+ roff
, value
);
1461 // The next reloc should be a PLT32 reloc against __tls_get_addr.
1463 this->skip_call_tls_get_addr_
= true;
1466 // Check the range for a TLS relocation.
1469 Target_i386::Relocate::check_range(const Relocate_info
<32, false>* relinfo
,
1471 const elfcpp::Rel
<32, false>& rel
,
1472 off_t view_size
, off_t off
)
1474 off_t offset
= rel
.get_r_offset() + off
;
1475 if (offset
< 0 || offset
> view_size
)
1477 fprintf(stderr
, _("%s: %s: TLS relocation out of range\n"),
1479 relinfo
->location(relnum
, rel
.get_r_offset()).c_str());
1484 // Check the validity of a TLS relocation. This is like assert.
1487 Target_i386::Relocate::check_tls(const Relocate_info
<32, false>* relinfo
,
1489 const elfcpp::Rel
<32, false>& rel
,
1495 _("%s: %s: TLS relocation against invalid instruction\n"),
1497 relinfo
->location(relnum
, rel
.get_r_offset()).c_str());
1502 // Relocate section data.
1505 Target_i386::relocate_section(const Relocate_info
<32, false>* relinfo
,
1506 unsigned int sh_type
,
1507 const unsigned char* prelocs
,
1509 unsigned char* view
,
1510 elfcpp::Elf_types
<32>::Elf_Addr address
,
1513 gold_assert(sh_type
== elfcpp::SHT_REL
);
1515 gold::relocate_section
<32, false, Target_i386
, elfcpp::SHT_REL
,
1516 Target_i386::Relocate
>(
1526 // Return the value to use for a dynamic which requires special
1527 // treatment. This is how we support equality comparisons of function
1528 // pointers across shared library boundaries, as described in the
1529 // processor specific ABI supplement.
1532 Target_i386::do_dynsym_value(const Symbol
* gsym
) const
1534 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
1535 return this->plt_section()->address() + gsym
->plt_offset();
1538 // Return a string used to fill a code section with nops to take up
1539 // the specified length.
1542 Target_i386::do_code_fill(off_t length
)
1546 // Build a jmp instruction to skip over the bytes.
1547 unsigned char jmp
[5];
1549 elfcpp::Swap_unaligned
<32, false>::writeval(jmp
+ 1, length
- 5);
1550 return (std::string(reinterpret_cast<char*>(&jmp
[0]), 5)
1551 + std::string(length
- 5, '\0'));
1554 // Nop sequences of various lengths.
1555 const char nop1
[1] = { 0x90 }; // nop
1556 const char nop2
[2] = { 0x66, 0x90 }; // xchg %ax %ax
1557 const char nop3
[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi
1558 const char nop4
[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi
1559 const char nop5
[5] = { 0x90, 0x8d, 0x74, 0x26, // nop
1560 0x00 }; // leal 0(%esi,1),%esi
1561 const char nop6
[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
1563 const char nop7
[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
1565 const char nop8
[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop
1566 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi
1567 const char nop9
[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi
1568 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi
1570 const char nop10
[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi
1571 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi
1573 const char nop11
[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi
1574 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi
1576 const char nop12
[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
1577 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi
1578 0x00, 0x00, 0x00, 0x00 };
1579 const char nop13
[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
1580 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi
1581 0x27, 0x00, 0x00, 0x00,
1583 const char nop14
[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
1584 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi
1585 0xbc, 0x27, 0x00, 0x00,
1587 const char nop15
[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15
1588 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,...
1589 0x90, 0x90, 0x90, 0x90,
1592 const char* nops
[16] = {
1594 nop1
, nop2
, nop3
, nop4
, nop5
, nop6
, nop7
,
1595 nop8
, nop9
, nop10
, nop11
, nop12
, nop13
, nop14
, nop15
1598 return std::string(nops
[length
], length
);
1601 // The selector for i386 object files.
1603 class Target_selector_i386
: public Target_selector
1606 Target_selector_i386()
1607 : Target_selector(elfcpp::EM_386
, 32, false)
1611 recognize(int machine
, int osabi
, int abiversion
);
1614 Target_i386
* target_
;
1617 // Recognize an i386 object file when we already know that the machine
1618 // number is EM_386.
1621 Target_selector_i386::recognize(int, int, int)
1623 if (this->target_
== NULL
)
1624 this->target_
= new Target_i386();
1625 return this->target_
;
1628 Target_selector_i386 target_selector_i386
;
1630 } // End anonymous namespace.