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 // Relocate a section.
79 relocate_section(const Relocate_info
<32, false>*,
81 const unsigned char* prelocs
,
84 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
87 // Return a string used to fill a code section with nops.
89 do_code_fill(off_t length
);
92 // The class which scans relocations.
96 local(const General_options
& options
, Symbol_table
* symtab
,
97 Layout
* layout
, Target_i386
* target
,
98 Sized_relobj
<32, false>* object
,
99 unsigned int data_shndx
,
100 const elfcpp::Rel
<32, false>& reloc
, unsigned int r_type
,
101 const elfcpp::Sym
<32, false>& lsym
);
104 global(const General_options
& options
, Symbol_table
* symtab
,
105 Layout
* layout
, Target_i386
* target
,
106 Sized_relobj
<32, false>* object
,
107 unsigned int data_shndx
,
108 const elfcpp::Rel
<32, false>& reloc
, unsigned int r_type
,
112 // The class which implements relocation.
117 : skip_call_tls_get_addr_(false)
122 if (this->skip_call_tls_get_addr_
)
124 // FIXME: This needs to specify the location somehow.
125 fprintf(stderr
, _("%s: missing expected TLS relocation\n"),
131 // Do a relocation. Return false if the caller should not issue
132 // any warnings about this relocation.
134 relocate(const Relocate_info
<32, false>*, Target_i386
*, size_t relnum
,
135 const elfcpp::Rel
<32, false>&,
136 unsigned int r_type
, const Sized_symbol
<32>*,
137 const Symbol_value
<32>*,
138 unsigned char*, elfcpp::Elf_types
<32>::Elf_Addr
,
142 // Do a TLS relocation.
144 relocate_tls(const Relocate_info
<32, false>*, size_t relnum
,
145 const elfcpp::Rel
<32, false>&,
146 unsigned int r_type
, const Sized_symbol
<32>*,
147 const Symbol_value
<32>*,
148 unsigned char*, elfcpp::Elf_types
<32>::Elf_Addr
, off_t
);
150 // Do a TLS Initial-Exec to Local-Exec transition.
152 tls_ie_to_le(const Relocate_info
<32, false>*, size_t relnum
,
153 Output_segment
* tls_segment
,
154 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
155 elfcpp::Elf_types
<32>::Elf_Addr value
,
159 // Do a TLS Global-Dynamic to Local-Exec transition.
161 tls_gd_to_le(const Relocate_info
<32, false>*, size_t relnum
,
162 Output_segment
* tls_segment
,
163 const elfcpp::Rel
<32, false>&, unsigned int r_type
,
164 elfcpp::Elf_types
<32>::Elf_Addr value
,
168 // Check the range for a TLS relocation.
170 check_range(const Relocate_info
<32, false>*, size_t relnum
,
171 const elfcpp::Rel
<32, false>&, off_t
, off_t
);
173 // Check the validity of a TLS relocation. This is like assert.
175 check_tls(const Relocate_info
<32, false>*, size_t relnum
,
176 const elfcpp::Rel
<32, false>&, bool);
178 // This is set if we should skip the next reloc, which should be a
179 // PLT32 reloc against ___tls_get_addr.
180 bool skip_call_tls_get_addr_
;
183 // Adjust TLS relocation type based on the options and whether this
184 // is a local symbol.
186 optimize_tls_reloc(bool is_final
, int r_type
);
188 // Get the GOT section, creating it if necessary.
189 Output_data_got
<32, false>*
190 got_section(Symbol_table
*, Layout
*);
192 // Create a PLT entry for a global symbol.
194 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
196 // Get the PLT section.
197 Output_data_plt_i386
*
200 gold_assert(this->plt_
!= NULL
);
204 // Get the dynamic reloc section, creating it if necessary.
206 rel_dyn_section(Layout
*);
208 // Copy a relocation against a global symbol.
210 copy_reloc(const General_options
*, Symbol_table
*, Layout
*,
211 Sized_relobj
<32, false>*, unsigned int,
212 Symbol
*, const elfcpp::Rel
<32, false>&);
214 // Information about this specific target which we pass to the
215 // general Target structure.
216 static const Target::Target_info i386_info
;
219 Output_data_got
<32, false>* got_
;
221 Output_data_plt_i386
* plt_
;
222 // The GOT PLT section.
223 Output_data_space
* got_plt_
;
224 // The dynamic reloc section.
225 Reloc_section
* rel_dyn_
;
226 // Relocs saved to avoid a COPY reloc.
227 Copy_relocs
<32, false>* copy_relocs_
;
228 // Space for variables copied with a COPY reloc.
229 Output_data_space
* dynbss_
;
232 const Target::Target_info
Target_i386::i386_info
=
235 false, // is_big_endian
236 elfcpp::EM_386
, // machine_code
237 false, // has_make_symbol
238 false, // has_resolve
239 true, // has_code_fill
240 "/usr/lib/libc.so.1", // dynamic_linker
241 0x08048000, // text_segment_address
242 0x1000, // abi_pagesize
243 0x1000 // common_pagesize
246 // Get the GOT section, creating it if necessary.
248 Output_data_got
<32, false>*
249 Target_i386::got_section(Symbol_table
* symtab
, Layout
* layout
)
251 if (this->got_
== NULL
)
253 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
255 this->got_
= new Output_data_got
<32, false>();
257 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
258 elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
,
261 // The old GNU linker creates a .got.plt section. We just
262 // create another set of data in the .got section. Note that we
263 // always create a PLT if we create a GOT, although the PLT
265 this->got_plt_
= new Output_data_space(4);
266 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
267 elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
,
270 // The first three entries are reserved.
271 this->got_plt_
->set_space_size(3 * 4);
273 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
274 symtab
->define_in_output_data(this, "_GLOBAL_OFFSET_TABLE_", NULL
,
276 0, 0, elfcpp::STT_OBJECT
,
278 elfcpp::STV_HIDDEN
, 0,
285 // Get the dynamic reloc section, creating it if necessary.
287 Target_i386::Reloc_section
*
288 Target_i386::rel_dyn_section(Layout
* layout
)
290 if (this->rel_dyn_
== NULL
)
292 gold_assert(layout
!= NULL
);
293 this->rel_dyn_
= new Reloc_section();
294 layout
->add_output_section_data(".rel.dyn", elfcpp::SHT_REL
,
295 elfcpp::SHF_ALLOC
, this->rel_dyn_
);
297 return this->rel_dyn_
;
300 // A class to handle the PLT data.
302 class Output_data_plt_i386
: public Output_section_data
305 typedef Output_data_reloc
<elfcpp::SHT_REL
, true, 32, false> Reloc_section
;
307 Output_data_plt_i386(Layout
*, Output_data_space
*);
309 // Add an entry to the PLT.
311 add_entry(Symbol
* gsym
);
313 // Return the .rel.plt section data.
316 { return this->rel_
; }
320 do_adjust_output_section(Output_section
* os
);
323 // The size of an entry in the PLT.
324 static const int plt_entry_size
= 16;
326 // The first entry in the PLT for an executable.
327 static unsigned char exec_first_plt_entry
[plt_entry_size
];
329 // The first entry in the PLT for a shared object.
330 static unsigned char dyn_first_plt_entry
[plt_entry_size
];
332 // Other entries in the PLT for an executable.
333 static unsigned char exec_plt_entry
[plt_entry_size
];
335 // Other entries in the PLT for a shared object.
336 static unsigned char dyn_plt_entry
[plt_entry_size
];
338 // Set the final size.
340 do_set_address(uint64_t, off_t
)
341 { this->set_data_size((this->count_
+ 1) * plt_entry_size
); }
343 // Write out the PLT data.
345 do_write(Output_file
*);
347 // The reloc section.
349 // The .got.plt section.
350 Output_data_space
* got_plt_
;
351 // The number of PLT entries.
355 // Create the PLT section. The ordinary .got section is an argument,
356 // since we need to refer to the start. We also create our own .got
357 // section just for PLT entries.
359 Output_data_plt_i386::Output_data_plt_i386(Layout
* layout
,
360 Output_data_space
* got_plt
)
361 : Output_section_data(4), got_plt_(got_plt
), count_(0)
363 this->rel_
= new Reloc_section();
364 layout
->add_output_section_data(".rel.plt", elfcpp::SHT_REL
,
365 elfcpp::SHF_ALLOC
, this->rel_
);
371 Output_data_plt_i386::do_adjust_output_section(Output_section
* os
)
373 // UnixWare sets the entsize of .plt to 4, and so does the old GNU
374 // linker, and so do we.
378 // Add an entry to the PLT.
381 Output_data_plt_i386::add_entry(Symbol
* gsym
)
383 gold_assert(!gsym
->has_plt_offset());
385 // Note that when setting the PLT offset we skip the initial
386 // reserved PLT entry.
387 gsym
->set_plt_offset((this->count_
+ 1) * plt_entry_size
);
391 off_t got_offset
= this->got_plt_
->data_size();
393 // Every PLT entry needs a GOT entry which points back to the PLT
394 // entry (this will be changed by the dynamic linker, normally
395 // lazily when the function is called).
396 this->got_plt_
->set_space_size(got_offset
+ 4);
398 // Every PLT entry needs a reloc.
399 gsym
->set_needs_dynsym_entry();
400 this->rel_
->add_global(gsym
, elfcpp::R_386_JUMP_SLOT
, this->got_plt_
,
403 // Note that we don't need to save the symbol. The contents of the
404 // PLT are independent of which symbols are used. The symbols only
405 // appear in the relocations.
408 // The first entry in the PLT for an executable.
410 unsigned char Output_data_plt_i386::exec_first_plt_entry
[plt_entry_size
] =
412 0xff, 0x35, // pushl contents of memory address
413 0, 0, 0, 0, // replaced with address of .got + 4
414 0xff, 0x25, // jmp indirect
415 0, 0, 0, 0, // replaced with address of .got + 8
419 // The first entry in the PLT for a shared object.
421 unsigned char Output_data_plt_i386::dyn_first_plt_entry
[plt_entry_size
] =
423 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx)
424 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx)
428 // Subsequent entries in the PLT for an executable.
430 unsigned char Output_data_plt_i386::exec_plt_entry
[plt_entry_size
] =
432 0xff, 0x25, // jmp indirect
433 0, 0, 0, 0, // replaced with address of symbol in .got
434 0x68, // pushl immediate
435 0, 0, 0, 0, // replaced with offset into relocation table
436 0xe9, // jmp relative
437 0, 0, 0, 0 // replaced with offset to start of .plt
440 // Subsequent entries in the PLT for a shared object.
442 unsigned char Output_data_plt_i386::dyn_plt_entry
[plt_entry_size
] =
444 0xff, 0xa3, // jmp *offset(%ebx)
445 0, 0, 0, 0, // replaced with offset of symbol in .got
446 0x68, // pushl immediate
447 0, 0, 0, 0, // replaced with offset into relocation table
448 0xe9, // jmp relative
449 0, 0, 0, 0 // replaced with offset to start of .plt
452 // Write out the PLT. This uses the hand-coded instructions above,
453 // and adjusts them as needed. This is all specified by the i386 ELF
454 // Processor Supplement.
457 Output_data_plt_i386::do_write(Output_file
* of
)
459 const off_t offset
= this->offset();
460 const off_t oview_size
= this->data_size();
461 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
463 const off_t got_file_offset
= this->got_plt_
->offset();
464 const off_t got_size
= this->got_plt_
->data_size();
465 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
468 unsigned char* pov
= oview
;
470 elfcpp::Elf_types
<32>::Elf_Addr plt_address
= this->address();
471 elfcpp::Elf_types
<32>::Elf_Addr got_address
= this->got_plt_
->address();
473 if (parameters
->output_is_shared())
474 memcpy(pov
, dyn_first_plt_entry
, plt_entry_size
);
477 memcpy(pov
, exec_first_plt_entry
, plt_entry_size
);
478 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2, got_address
+ 4);
479 elfcpp::Swap
<32, false>::writeval(pov
+ 8, got_address
+ 8);
481 pov
+= plt_entry_size
;
483 unsigned char* got_pov
= got_view
;
485 memset(got_pov
, 0, 12);
488 const int rel_size
= elfcpp::Elf_sizes
<32>::rel_size
;
490 unsigned int plt_offset
= plt_entry_size
;
491 unsigned int plt_rel_offset
= 0;
492 unsigned int got_offset
= 12;
493 const unsigned int count
= this->count_
;
494 for (unsigned int i
= 0;
497 pov
+= plt_entry_size
,
499 plt_offset
+= plt_entry_size
,
500 plt_rel_offset
+= rel_size
,
503 // Set and adjust the PLT entry itself.
505 if (parameters
->output_is_shared())
507 memcpy(pov
, dyn_plt_entry
, plt_entry_size
);
508 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2, got_offset
);
512 memcpy(pov
, exec_plt_entry
, plt_entry_size
);
513 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
518 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 7, plt_rel_offset
);
519 elfcpp::Swap
<32, false>::writeval(pov
+ 12,
520 - (plt_offset
+ plt_entry_size
));
522 // Set the entry in the GOT.
523 elfcpp::Swap
<32, false>::writeval(got_pov
, plt_address
+ plt_offset
+ 6);
526 gold_assert(pov
- oview
== oview_size
);
527 gold_assert(got_pov
- got_view
== got_size
);
529 of
->write_output_view(offset
, oview_size
, oview
);
530 of
->write_output_view(got_file_offset
, got_size
, got_view
);
533 // Create a PLT entry for a global symbol.
536 Target_i386::make_plt_entry(Symbol_table
* symtab
, Layout
* layout
, Symbol
* gsym
)
538 if (gsym
->has_plt_offset())
541 if (this->plt_
== NULL
)
543 // Create the GOT sections first.
544 this->got_section(symtab
, layout
);
546 this->plt_
= new Output_data_plt_i386(layout
, this->got_plt_
);
547 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
549 | elfcpp::SHF_EXECINSTR
),
553 this->plt_
->add_entry(gsym
);
556 // Handle a relocation against a non-function symbol defined in a
557 // dynamic object. The traditional way to handle this is to generate
558 // a COPY relocation to copy the variable at runtime from the shared
559 // object into the executable's data segment. However, this is
560 // undesirable in general, as if the size of the object changes in the
561 // dynamic object, the executable will no longer work correctly. If
562 // this relocation is in a writable section, then we can create a
563 // dynamic reloc and the dynamic linker will resolve it to the correct
564 // address at runtime. However, we do not want do that if the
565 // relocation is in a read-only section, as it would prevent the
566 // readonly segment from being shared. And if we have to eventually
567 // generate a COPY reloc, then any dynamic relocations will be
568 // useless. So this means that if this is a writable section, we need
569 // to save the relocation until we see whether we have to create a
570 // COPY relocation for this symbol for any other relocation.
573 Target_i386::copy_reloc(const General_options
* options
,
574 Symbol_table
* symtab
,
576 Sized_relobj
<32, false>* object
,
577 unsigned int data_shndx
, Symbol
* gsym
,
578 const elfcpp::Rel
<32, false>& rel
)
580 Sized_symbol
<32>* ssym
;
581 ssym
= symtab
->get_sized_symbol
SELECT_SIZE_NAME(32) (gsym
584 if (!Copy_relocs
<32, false>::need_copy_reloc(options
, object
,
587 // So far we do not need a COPY reloc. Save this relocation.
588 // If it turns out that we never need a COPY reloc for this
589 // symbol, then we will emit the relocation.
590 if (this->copy_relocs_
== NULL
)
591 this->copy_relocs_
= new Copy_relocs
<32, false>();
592 this->copy_relocs_
->save(ssym
, object
, data_shndx
, rel
);
596 // Allocate space for this symbol in the .bss section.
598 elfcpp::Elf_types
<32>::Elf_WXword symsize
= ssym
->symsize();
600 // There is no defined way to determine the required alignment
601 // of the symbol. We pick the alignment based on the size. We
602 // set an arbitrary maximum of 256.
604 for (align
= 1; align
< 512; align
<<= 1)
605 if ((symsize
& align
) != 0)
608 if (this->dynbss_
== NULL
)
610 this->dynbss_
= new Output_data_space(align
);
611 layout
->add_output_section_data(".bss",
614 | elfcpp::SHF_WRITE
),
618 Output_data_space
* dynbss
= this->dynbss_
;
620 if (align
> dynbss
->addralign())
621 dynbss
->set_space_alignment(align
);
623 off_t dynbss_size
= dynbss
->data_size();
624 dynbss_size
= align_address(dynbss_size
, align
);
625 off_t offset
= dynbss_size
;
626 dynbss
->set_space_size(dynbss_size
+ symsize
);
628 // Define the symbol in the .dynbss section.
629 symtab
->define_in_output_data(this, ssym
->name(), ssym
->version(),
630 dynbss
, offset
, symsize
, ssym
->type(),
631 ssym
->binding(), ssym
->visibility(),
632 ssym
->nonvis(), false, false);
634 // Add the COPY reloc.
635 ssym
->set_needs_dynsym_entry();
636 Reloc_section
* rel_dyn
= this->rel_dyn_section(layout
);
637 rel_dyn
->add_global(ssym
, elfcpp::R_386_COPY
, dynbss
, offset
);
641 // Optimize the TLS relocation type based on what we know about the
642 // symbol. IS_FINAL is true if the final address of this symbol is
643 // known at link time.
646 Target_i386::optimize_tls_reloc(bool is_final
, int r_type
)
648 // If we are generating a shared library, then we can't do anything
650 if (parameters
->output_is_shared())
655 case elfcpp::R_386_TLS_GD
:
656 case elfcpp::R_386_TLS_GOTDESC
:
657 case elfcpp::R_386_TLS_DESC_CALL
:
658 // These are Global-Dynamic which permits fully general TLS
659 // access. Since we know that we are generating an executable,
660 // we can convert this to Initial-Exec. If we also know that
661 // this is a local symbol, we can further switch to Local-Exec.
663 return elfcpp::R_386_TLS_LE_32
;
664 return elfcpp::R_386_TLS_IE_32
;
666 case elfcpp::R_386_TLS_LDM
:
667 // This is Local-Dynamic, which refers to a local symbol in the
668 // dynamic TLS block. Since we know that we generating an
669 // executable, we can switch to Local-Exec.
670 return elfcpp::R_386_TLS_LE_32
;
672 case elfcpp::R_386_TLS_LDO_32
:
673 // Another type of Local-Dynamic relocation.
674 return elfcpp::R_386_TLS_LE
;
676 case elfcpp::R_386_TLS_IE
:
677 case elfcpp::R_386_TLS_GOTIE
:
678 case elfcpp::R_386_TLS_IE_32
:
679 // These are Initial-Exec relocs which get the thread offset
680 // from the GOT. If we know that we are linking against the
681 // local symbol, we can switch to Local-Exec, which links the
682 // thread offset into the instruction.
684 return elfcpp::R_386_TLS_LE_32
;
687 case elfcpp::R_386_TLS_LE
:
688 case elfcpp::R_386_TLS_LE_32
:
689 // When we already have Local-Exec, there is nothing further we
698 // Scan a relocation for a local symbol.
701 Target_i386::Scan::local(const General_options
&,
702 Symbol_table
* symtab
,
705 Sized_relobj
<32, false>* object
,
707 const elfcpp::Rel
<32, false>&,
709 const elfcpp::Sym
<32, false>&)
713 case elfcpp::R_386_NONE
:
714 case elfcpp::R_386_GNU_VTINHERIT
:
715 case elfcpp::R_386_GNU_VTENTRY
:
718 case elfcpp::R_386_32
:
719 case elfcpp::R_386_16
:
720 case elfcpp::R_386_8
:
721 // FIXME: If we are generating a shared object we need to copy
722 // this relocation into the object.
723 gold_assert(!parameters
->output_is_shared());
726 case elfcpp::R_386_PC32
:
727 case elfcpp::R_386_PC16
:
728 case elfcpp::R_386_PC8
:
731 case elfcpp::R_386_GOTOFF
:
732 case elfcpp::R_386_GOTPC
:
733 // We need a GOT section.
734 target
->got_section(symtab
, layout
);
737 case elfcpp::R_386_COPY
:
738 case elfcpp::R_386_GLOB_DAT
:
739 case elfcpp::R_386_JUMP_SLOT
:
740 case elfcpp::R_386_RELATIVE
:
741 case elfcpp::R_386_TLS_TPOFF
:
742 case elfcpp::R_386_TLS_DTPMOD32
:
743 case elfcpp::R_386_TLS_DTPOFF32
:
744 case elfcpp::R_386_TLS_TPOFF32
:
745 case elfcpp::R_386_TLS_DESC
:
746 fprintf(stderr
, _("%s: %s: unexpected reloc %u in object file\n"),
747 program_name
, object
->name().c_str(), r_type
);
751 case elfcpp::R_386_TLS_IE
:
752 case elfcpp::R_386_TLS_GOTIE
:
753 case elfcpp::R_386_TLS_LE
:
754 case elfcpp::R_386_TLS_GD
:
755 case elfcpp::R_386_TLS_LDM
:
756 case elfcpp::R_386_TLS_LDO_32
:
757 case elfcpp::R_386_TLS_IE_32
:
758 case elfcpp::R_386_TLS_LE_32
:
759 case elfcpp::R_386_TLS_GOTDESC
:
760 case elfcpp::R_386_TLS_DESC_CALL
:
762 bool output_is_shared
= parameters
->output_is_shared();
763 r_type
= Target_i386::optimize_tls_reloc(!output_is_shared
,
767 case elfcpp::R_386_TLS_LE
:
768 case elfcpp::R_386_TLS_LE_32
:
769 // FIXME: If generating a shared object, we need to copy
770 // this relocation into the object.
771 gold_assert(!output_is_shared
);
774 case elfcpp::R_386_TLS_IE
:
775 case elfcpp::R_386_TLS_GOTIE
:
776 case elfcpp::R_386_TLS_GD
:
777 case elfcpp::R_386_TLS_LDM
:
778 case elfcpp::R_386_TLS_LDO_32
:
779 case elfcpp::R_386_TLS_IE_32
:
780 case elfcpp::R_386_TLS_GOTDESC
:
781 case elfcpp::R_386_TLS_DESC_CALL
:
783 _("%s: %s: unsupported reloc %u against local symbol\n"),
784 program_name
, object
->name().c_str(), r_type
);
790 case elfcpp::R_386_GOT32
:
791 case elfcpp::R_386_PLT32
:
792 case elfcpp::R_386_32PLT
:
793 case elfcpp::R_386_TLS_GD_32
:
794 case elfcpp::R_386_TLS_GD_PUSH
:
795 case elfcpp::R_386_TLS_GD_CALL
:
796 case elfcpp::R_386_TLS_GD_POP
:
797 case elfcpp::R_386_TLS_LDM_32
:
798 case elfcpp::R_386_TLS_LDM_PUSH
:
799 case elfcpp::R_386_TLS_LDM_CALL
:
800 case elfcpp::R_386_TLS_LDM_POP
:
801 case elfcpp::R_386_USED_BY_INTEL_200
:
803 fprintf(stderr
, _("%s: %s: unsupported reloc %u against local symbol\n"),
804 program_name
, object
->name().c_str(), r_type
);
809 // Scan a relocation for a global symbol.
812 Target_i386::Scan::global(const General_options
& options
,
813 Symbol_table
* symtab
,
816 Sized_relobj
<32, false>* object
,
817 unsigned int data_shndx
,
818 const elfcpp::Rel
<32, false>& reloc
,
824 case elfcpp::R_386_NONE
:
825 case elfcpp::R_386_GNU_VTINHERIT
:
826 case elfcpp::R_386_GNU_VTENTRY
:
829 case elfcpp::R_386_32
:
830 case elfcpp::R_386_PC32
:
831 case elfcpp::R_386_16
:
832 case elfcpp::R_386_PC16
:
833 case elfcpp::R_386_8
:
834 case elfcpp::R_386_PC8
:
835 // FIXME: If we are generating a shared object we may need to
836 // copy this relocation into the object. If this symbol is
837 // defined in a shared object, we may need to copy this
838 // relocation in order to avoid a COPY relocation.
839 gold_assert(!parameters
->output_is_shared());
841 if (gsym
->is_from_dynobj())
843 // This symbol is defined in a dynamic object. If it is a
844 // function, we make a PLT entry. Otherwise we need to
845 // either generate a COPY reloc or copy this reloc.
846 if (gsym
->type() == elfcpp::STT_FUNC
)
847 target
->make_plt_entry(symtab
, layout
, gsym
);
849 target
->copy_reloc(&options
, symtab
, layout
, object
, data_shndx
,
855 case elfcpp::R_386_GOT32
:
857 // The symbol requires a GOT entry.
858 Output_data_got
<32, false>* got
= target
->got_section(symtab
, layout
);
859 if (got
->add_global(gsym
))
861 // If this symbol is not fully resolved, we need to add a
862 // dynamic relocation for it.
863 if (!gsym
->final_value_is_known())
865 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
866 rel_dyn
->add_global(gsym
, elfcpp::R_386_GLOB_DAT
, got
,
873 case elfcpp::R_386_PLT32
:
874 // If the symbol is fully resolved, this is just a PC32 reloc.
875 // Otherwise we need a PLT entry.
876 if (gsym
->final_value_is_known())
878 target
->make_plt_entry(symtab
, layout
, gsym
);
881 case elfcpp::R_386_GOTOFF
:
882 case elfcpp::R_386_GOTPC
:
883 // We need a GOT section.
884 target
->got_section(symtab
, layout
);
887 case elfcpp::R_386_COPY
:
888 case elfcpp::R_386_GLOB_DAT
:
889 case elfcpp::R_386_JUMP_SLOT
:
890 case elfcpp::R_386_RELATIVE
:
891 case elfcpp::R_386_TLS_TPOFF
:
892 case elfcpp::R_386_TLS_DTPMOD32
:
893 case elfcpp::R_386_TLS_DTPOFF32
:
894 case elfcpp::R_386_TLS_TPOFF32
:
895 case elfcpp::R_386_TLS_DESC
:
896 fprintf(stderr
, _("%s: %s: unexpected reloc %u in object file\n"),
897 program_name
, object
->name().c_str(), r_type
);
901 case elfcpp::R_386_TLS_IE
:
902 case elfcpp::R_386_TLS_GOTIE
:
903 case elfcpp::R_386_TLS_LE
:
904 case elfcpp::R_386_TLS_GD
:
905 case elfcpp::R_386_TLS_LDM
:
906 case elfcpp::R_386_TLS_LDO_32
:
907 case elfcpp::R_386_TLS_IE_32
:
908 case elfcpp::R_386_TLS_LE_32
:
909 case elfcpp::R_386_TLS_GOTDESC
:
910 case elfcpp::R_386_TLS_DESC_CALL
:
912 const bool is_final
= gsym
->final_value_is_known();
913 r_type
= Target_i386::optimize_tls_reloc(is_final
, r_type
);
916 case elfcpp::R_386_TLS_LE
:
917 case elfcpp::R_386_TLS_LE_32
:
918 // FIXME: If generating a shared object, we need to copy
919 // this relocation into the object.
920 gold_assert(!parameters
->output_is_shared());
923 case elfcpp::R_386_TLS_IE
:
924 case elfcpp::R_386_TLS_GOTIE
:
925 case elfcpp::R_386_TLS_GD
:
926 case elfcpp::R_386_TLS_LDM
:
927 case elfcpp::R_386_TLS_LDO_32
:
928 case elfcpp::R_386_TLS_IE_32
:
929 case elfcpp::R_386_TLS_GOTDESC
:
930 case elfcpp::R_386_TLS_DESC_CALL
:
932 _("%s: %s: unsupported reloc %u "
933 "against global symbol %s\n"),
934 program_name
, object
->name().c_str(), r_type
,
941 case elfcpp::R_386_32PLT
:
942 case elfcpp::R_386_TLS_GD_32
:
943 case elfcpp::R_386_TLS_GD_PUSH
:
944 case elfcpp::R_386_TLS_GD_CALL
:
945 case elfcpp::R_386_TLS_GD_POP
:
946 case elfcpp::R_386_TLS_LDM_32
:
947 case elfcpp::R_386_TLS_LDM_PUSH
:
948 case elfcpp::R_386_TLS_LDM_CALL
:
949 case elfcpp::R_386_TLS_LDM_POP
:
950 case elfcpp::R_386_USED_BY_INTEL_200
:
953 _("%s: %s: unsupported reloc %u against global symbol %s\n"),
954 program_name
, object
->name().c_str(), r_type
, gsym
->name());
959 // Scan relocations for a section.
962 Target_i386::scan_relocs(const General_options
& options
,
963 Symbol_table
* symtab
,
965 Sized_relobj
<32, false>* object
,
966 unsigned int data_shndx
,
967 unsigned int sh_type
,
968 const unsigned char* prelocs
,
970 size_t local_symbol_count
,
971 const unsigned char* plocal_symbols
,
972 Symbol
** global_symbols
)
974 if (sh_type
== elfcpp::SHT_RELA
)
976 fprintf(stderr
, _("%s: %s: unsupported RELA reloc section\n"),
977 program_name
, object
->name().c_str());
981 gold::scan_relocs
<32, false, Target_i386
, elfcpp::SHT_REL
,
996 // Finalize the sections.
999 Target_i386::do_finalize_sections(Layout
* layout
)
1001 // Fill in some more dynamic tags.
1002 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
1005 if (this->got_plt_
!= NULL
)
1006 odyn
->add_section_address(elfcpp::DT_PLTGOT
, this->got_plt_
);
1008 if (this->plt_
!= NULL
)
1010 const Output_data
* od
= this->plt_
->rel_plt();
1011 odyn
->add_section_size(elfcpp::DT_PLTRELSZ
, od
);
1012 odyn
->add_section_address(elfcpp::DT_JMPREL
, od
);
1013 odyn
->add_constant(elfcpp::DT_PLTREL
, elfcpp::DT_REL
);
1016 if (this->rel_dyn_
!= NULL
)
1018 const Output_data
* od
= this->rel_dyn_
;
1019 odyn
->add_section_address(elfcpp::DT_REL
, od
);
1020 odyn
->add_section_size(elfcpp::DT_RELSZ
, od
);
1021 odyn
->add_constant(elfcpp::DT_RELENT
,
1022 elfcpp::Elf_sizes
<32>::rel_size
);
1025 if (!parameters
->output_is_shared())
1027 // The value of the DT_DEBUG tag is filled in by the dynamic
1028 // linker at run time, and used by the debugger.
1029 odyn
->add_constant(elfcpp::DT_DEBUG
, 0);
1033 // Emit any relocs we saved in an attempt to avoid generating COPY
1035 if (this->copy_relocs_
== NULL
)
1037 if (this->copy_relocs_
->any_to_emit())
1039 Reloc_section
* rel_dyn
= this->rel_dyn_section(layout
);
1040 this->copy_relocs_
->emit(rel_dyn
);
1042 delete this->copy_relocs_
;
1043 this->copy_relocs_
= NULL
;
1046 // Perform a relocation.
1049 Target_i386::Relocate::relocate(const Relocate_info
<32, false>* relinfo
,
1050 Target_i386
* target
,
1052 const elfcpp::Rel
<32, false>& rel
,
1053 unsigned int r_type
,
1054 const Sized_symbol
<32>* gsym
,
1055 const Symbol_value
<32>* psymval
,
1056 unsigned char* view
,
1057 elfcpp::Elf_types
<32>::Elf_Addr address
,
1060 if (this->skip_call_tls_get_addr_
)
1062 if (r_type
!= elfcpp::R_386_PLT32
1064 || strcmp(gsym
->name(), "___tls_get_addr") != 0)
1066 fprintf(stderr
, _("%s: %s: missing expected TLS relocation\n"),
1068 relinfo
->location(relnum
, rel
.get_r_offset()).c_str());
1072 this->skip_call_tls_get_addr_
= false;
1077 // Pick the value to use for symbols defined in shared objects.
1078 Symbol_value
<32> symval
;
1079 if (gsym
!= NULL
&& gsym
->is_from_dynobj() && gsym
->has_plt_offset())
1081 symval
.set_output_value(target
->plt_section()->address()
1082 + gsym
->plt_offset());
1086 const Sized_relobj
<32, false>* object
= relinfo
->object
;
1090 case elfcpp::R_386_NONE
:
1091 case elfcpp::R_386_GNU_VTINHERIT
:
1092 case elfcpp::R_386_GNU_VTENTRY
:
1095 case elfcpp::R_386_32
:
1096 Relocate_functions
<32, false>::rel32(view
, object
, psymval
);
1099 case elfcpp::R_386_PC32
:
1100 Relocate_functions
<32, false>::pcrel32(view
, object
, psymval
, address
);
1103 case elfcpp::R_386_16
:
1104 Relocate_functions
<32, false>::rel16(view
, object
, psymval
);
1107 case elfcpp::R_386_PC16
:
1108 Relocate_functions
<32, false>::pcrel16(view
, object
, psymval
, address
);
1111 case elfcpp::R_386_8
:
1112 Relocate_functions
<32, false>::rel8(view
, object
, psymval
);
1115 case elfcpp::R_386_PC8
:
1116 Relocate_functions
<32, false>::pcrel8(view
, object
, psymval
, address
);
1119 case elfcpp::R_386_PLT32
:
1120 gold_assert(gsym
->has_plt_offset()
1121 || gsym
->final_value_is_known());
1122 Relocate_functions
<32, false>::pcrel32(view
, object
, psymval
, address
);
1125 case elfcpp::R_386_GOT32
:
1126 // Local GOT offsets not yet supported.
1128 gold_assert(gsym
->has_got_offset());
1129 Relocate_functions
<32, false>::rel32(view
, gsym
->got_offset());
1132 case elfcpp::R_386_GOTOFF
:
1134 elfcpp::Elf_types
<32>::Elf_Addr value
;
1135 value
= (psymval
->value(object
, 0)
1136 - target
->got_section(NULL
, NULL
)->address());
1137 Relocate_functions
<32, false>::rel32(view
, value
);
1141 case elfcpp::R_386_GOTPC
:
1143 elfcpp::Elf_types
<32>::Elf_Addr value
;
1144 value
= target
->got_section(NULL
, NULL
)->address();
1145 Relocate_functions
<32, false>::pcrel32(view
, value
, address
);
1149 case elfcpp::R_386_COPY
:
1150 case elfcpp::R_386_GLOB_DAT
:
1151 case elfcpp::R_386_JUMP_SLOT
:
1152 case elfcpp::R_386_RELATIVE
:
1153 case elfcpp::R_386_TLS_TPOFF
:
1154 case elfcpp::R_386_TLS_DTPMOD32
:
1155 case elfcpp::R_386_TLS_DTPOFF32
:
1156 case elfcpp::R_386_TLS_TPOFF32
:
1157 case elfcpp::R_386_TLS_DESC
:
1158 fprintf(stderr
, _("%s: %s: unexpected reloc %u in object file\n"),
1160 relinfo
->location(relnum
, rel
.get_r_offset()).c_str(),
1165 case elfcpp::R_386_TLS_IE
:
1166 case elfcpp::R_386_TLS_GOTIE
:
1167 case elfcpp::R_386_TLS_LE
:
1168 case elfcpp::R_386_TLS_GD
:
1169 case elfcpp::R_386_TLS_LDM
:
1170 case elfcpp::R_386_TLS_LDO_32
:
1171 case elfcpp::R_386_TLS_IE_32
:
1172 case elfcpp::R_386_TLS_LE_32
:
1173 case elfcpp::R_386_TLS_GOTDESC
:
1174 case elfcpp::R_386_TLS_DESC_CALL
:
1175 this->relocate_tls(relinfo
, relnum
, rel
, r_type
, gsym
, psymval
, view
,
1176 address
, view_size
);
1179 case elfcpp::R_386_32PLT
:
1180 case elfcpp::R_386_TLS_GD_32
:
1181 case elfcpp::R_386_TLS_GD_PUSH
:
1182 case elfcpp::R_386_TLS_GD_CALL
:
1183 case elfcpp::R_386_TLS_GD_POP
:
1184 case elfcpp::R_386_TLS_LDM_32
:
1185 case elfcpp::R_386_TLS_LDM_PUSH
:
1186 case elfcpp::R_386_TLS_LDM_CALL
:
1187 case elfcpp::R_386_TLS_LDM_POP
:
1188 case elfcpp::R_386_USED_BY_INTEL_200
:
1190 fprintf(stderr
, _("%s: %s: unsupported reloc %u\n"),
1192 relinfo
->location(relnum
, rel
.get_r_offset()).c_str(),
1194 // gold_exit(false);
1201 // Perform a TLS relocation.
1204 Target_i386::Relocate::relocate_tls(const Relocate_info
<32, false>* relinfo
,
1206 const elfcpp::Rel
<32, false>& rel
,
1207 unsigned int r_type
,
1208 const Sized_symbol
<32>* gsym
,
1209 const Symbol_value
<32>* psymval
,
1210 unsigned char* view
,
1211 elfcpp::Elf_types
<32>::Elf_Addr
,
1214 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
1215 if (tls_segment
== NULL
)
1217 fprintf(stderr
, _("%s: %s: TLS reloc but no TLS segment\n"),
1219 relinfo
->location(relnum
, rel
.get_r_offset()).c_str());
1223 elfcpp::Elf_types
<32>::Elf_Addr value
= psymval
->value(relinfo
->object
, 0);
1225 const bool is_final
= (gsym
== NULL
1226 ? !parameters
->output_is_shared()
1227 : gsym
->final_value_is_known());
1228 const unsigned int opt_r_type
=
1229 Target_i386::optimize_tls_reloc(is_final
, r_type
);
1232 case elfcpp::R_386_TLS_LE_32
:
1233 value
= tls_segment
->vaddr() + tls_segment
->memsz() - value
;
1234 Relocate_functions
<32, false>::rel32(view
, value
);
1237 case elfcpp::R_386_TLS_LE
:
1238 value
= value
- (tls_segment
->vaddr() + tls_segment
->memsz());
1239 Relocate_functions
<32, false>::rel32(view
, value
);
1242 case elfcpp::R_386_TLS_IE
:
1243 case elfcpp::R_386_TLS_GOTIE
:
1244 case elfcpp::R_386_TLS_IE_32
:
1245 if (opt_r_type
== elfcpp::R_386_TLS_LE_32
)
1247 Target_i386::Relocate::tls_ie_to_le(relinfo
, relnum
, tls_segment
,
1248 rel
, r_type
, value
, view
,
1252 fprintf(stderr
, _("%s: %s: unsupported reloc type %u\n"),
1254 relinfo
->location(relnum
, rel
.get_r_offset()).c_str(),
1256 // gold_exit(false);
1259 case elfcpp::R_386_TLS_GD
:
1260 if (opt_r_type
== elfcpp::R_386_TLS_LE_32
)
1262 this->tls_gd_to_le(relinfo
, relnum
, tls_segment
,
1263 rel
, r_type
, value
, view
,
1267 fprintf(stderr
, _("%s: %s: unsupported reloc %u\n"),
1269 relinfo
->location(relnum
, rel
.get_r_offset()).c_str(),
1271 // gold_exit(false);
1274 case elfcpp::R_386_TLS_LDM
:
1275 case elfcpp::R_386_TLS_LDO_32
:
1276 case elfcpp::R_386_TLS_GOTDESC
:
1277 case elfcpp::R_386_TLS_DESC_CALL
:
1278 fprintf(stderr
, _("%s: %s: unsupported reloc %u\n"),
1280 relinfo
->location(relnum
, rel
.get_r_offset()).c_str(),
1282 // gold_exit(false);
1287 // Do a relocation in which we convert a TLS Initial-Exec to a
1291 Target_i386::Relocate::tls_ie_to_le(const Relocate_info
<32, false>* relinfo
,
1293 Output_segment
* tls_segment
,
1294 const elfcpp::Rel
<32, false>& rel
,
1295 unsigned int r_type
,
1296 elfcpp::Elf_types
<32>::Elf_Addr value
,
1297 unsigned char* view
,
1300 // We have to actually change the instructions, which means that we
1301 // need to examine the opcodes to figure out which instruction we
1303 if (r_type
== elfcpp::R_386_TLS_IE
)
1305 // movl %gs:XX,%eax ==> movl $YY,%eax
1306 // movl %gs:XX,%reg ==> movl $YY,%reg
1307 // addl %gs:XX,%reg ==> addl $YY,%reg
1308 Target_i386::Relocate::check_range(relinfo
, relnum
, rel
, view_size
, -1);
1309 Target_i386::Relocate::check_range(relinfo
, relnum
, rel
, view_size
, 4);
1311 unsigned char op1
= view
[-1];
1314 // movl XX,%eax ==> movl $YY,%eax
1319 Target_i386::Relocate::check_range(relinfo
, relnum
, rel
,
1322 unsigned char op2
= view
[-2];
1325 // movl XX,%reg ==> movl $YY,%reg
1326 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
,
1327 (op1
& 0xc7) == 0x05);
1329 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
1331 else if (op2
== 0x03)
1333 // addl XX,%reg ==> addl $YY,%reg
1334 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
,
1335 (op1
& 0xc7) == 0x05);
1337 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
1340 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
, 0);
1345 // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
1346 // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
1347 // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
1348 Target_i386::Relocate::check_range(relinfo
, relnum
, rel
, view_size
, -2);
1349 Target_i386::Relocate::check_range(relinfo
, relnum
, rel
, view_size
, 4);
1351 unsigned char op1
= view
[-1];
1352 unsigned char op2
= view
[-2];
1353 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
,
1354 (op1
& 0xc0) == 0x80 && (op1
& 7) != 4);
1357 // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
1359 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
1361 else if (op2
== 0x2b)
1363 // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
1365 view
[-1] = 0xe8 | ((op1
>> 3) & 7);
1367 else if (op2
== 0x03)
1369 // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
1371 view
[-1] = 0xc0 | ((op1
>> 3) & 7);
1374 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
, 0);
1377 value
= tls_segment
->vaddr() + tls_segment
->memsz() - value
;
1378 if (r_type
== elfcpp::R_386_TLS_IE
|| r_type
== elfcpp::R_386_TLS_GOTIE
)
1381 Relocate_functions
<32, false>::rel32(view
, value
);
1384 // Do a relocation in which we convert a TLS Global-Dynamic to a
1388 Target_i386::Relocate::tls_gd_to_le(const Relocate_info
<32, false>* relinfo
,
1390 Output_segment
* tls_segment
,
1391 const elfcpp::Rel
<32, false>& rel
,
1393 elfcpp::Elf_types
<32>::Elf_Addr value
,
1394 unsigned char* view
,
1397 // leal foo(,%reg,1),%eax; call ___tls_get_addr
1398 // ==> movl %gs,0,%eax; subl $foo@tpoff,%eax
1399 // leal foo(%reg),%eax; call ___tls_get_addr
1400 // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
1402 Target_i386::Relocate::check_range(relinfo
, relnum
, rel
, view_size
, -2);
1403 Target_i386::Relocate::check_range(relinfo
, relnum
, rel
, view_size
, 9);
1405 unsigned char op1
= view
[-1];
1406 unsigned char op2
= view
[-2];
1408 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
,
1409 op2
== 0x8d || op2
== 0x04);
1410 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
,
1417 Target_i386::Relocate::check_range(relinfo
, relnum
, rel
, view_size
, -3);
1418 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
,
1420 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
,
1421 ((op1
& 0xc7) == 0x05
1422 && op1
!= (4 << 3)));
1423 memcpy(view
- 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
1427 Target_i386::Relocate::check_tls(relinfo
, relnum
, rel
,
1428 (op1
& 0xf8) == 0x80 && (op1
& 7) != 4);
1429 if (rel
.get_r_offset() + 9 < view_size
&& view
[9] == 0x90)
1431 // There is a trailing nop. Use the size byte subl.
1432 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
1437 // Use the five byte subl.
1438 memcpy(view
- 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
1442 value
= tls_segment
->vaddr() + tls_segment
->memsz() - value
;
1443 Relocate_functions
<32, false>::rel32(view
+ roff
, value
);
1445 // The next reloc should be a PLT32 reloc against __tls_get_addr.
1447 this->skip_call_tls_get_addr_
= true;
1450 // Check the range for a TLS relocation.
1453 Target_i386::Relocate::check_range(const Relocate_info
<32, false>* relinfo
,
1455 const elfcpp::Rel
<32, false>& rel
,
1456 off_t view_size
, off_t off
)
1458 off_t offset
= rel
.get_r_offset() + off
;
1459 if (offset
< 0 || offset
> view_size
)
1461 fprintf(stderr
, _("%s: %s: TLS relocation out of range\n"),
1463 relinfo
->location(relnum
, rel
.get_r_offset()).c_str());
1468 // Check the validity of a TLS relocation. This is like assert.
1471 Target_i386::Relocate::check_tls(const Relocate_info
<32, false>* relinfo
,
1473 const elfcpp::Rel
<32, false>& rel
,
1479 _("%s: %s: TLS relocation against invalid instruction\n"),
1481 relinfo
->location(relnum
, rel
.get_r_offset()).c_str());
1486 // Relocate section data.
1489 Target_i386::relocate_section(const Relocate_info
<32, false>* relinfo
,
1490 unsigned int sh_type
,
1491 const unsigned char* prelocs
,
1493 unsigned char* view
,
1494 elfcpp::Elf_types
<32>::Elf_Addr address
,
1497 gold_assert(sh_type
== elfcpp::SHT_REL
);
1499 gold::relocate_section
<32, false, Target_i386
, elfcpp::SHT_REL
,
1500 Target_i386::Relocate
>(
1510 // Return a string used to fill a code section with nops to take up
1511 // the specified length.
1514 Target_i386::do_code_fill(off_t length
)
1518 // Build a jmp instruction to skip over the bytes.
1519 unsigned char jmp
[5];
1521 elfcpp::Swap_unaligned
<32, false>::writeval(jmp
+ 1, length
- 5);
1522 return (std::string(reinterpret_cast<char*>(&jmp
[0]), 5)
1523 + std::string(length
- 5, '\0'));
1526 // Nop sequences of various lengths.
1527 const char nop1
[1] = { 0x90 }; // nop
1528 const char nop2
[2] = { 0x66, 0x90 }; // xchg %ax %ax
1529 const char nop3
[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi
1530 const char nop4
[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi
1531 const char nop5
[5] = { 0x90, 0x8d, 0x74, 0x26, // nop
1532 0x00 }; // leal 0(%esi,1),%esi
1533 const char nop6
[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
1535 const char nop7
[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
1537 const char nop8
[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop
1538 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi
1539 const char nop9
[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi
1540 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi
1542 const char nop10
[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi
1543 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi
1545 const char nop11
[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi
1546 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi
1548 const char nop12
[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
1549 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi
1550 0x00, 0x00, 0x00, 0x00 };
1551 const char nop13
[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
1552 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi
1553 0x27, 0x00, 0x00, 0x00,
1555 const char nop14
[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
1556 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi
1557 0xbc, 0x27, 0x00, 0x00,
1559 const char nop15
[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15
1560 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,...
1561 0x90, 0x90, 0x90, 0x90,
1564 const char* nops
[16] = {
1566 nop1
, nop2
, nop3
, nop4
, nop5
, nop6
, nop7
,
1567 nop8
, nop9
, nop10
, nop11
, nop12
, nop13
, nop14
, nop15
1570 return std::string(nops
[length
], length
);
1573 // The selector for i386 object files.
1575 class Target_selector_i386
: public Target_selector
1578 Target_selector_i386()
1579 : Target_selector(elfcpp::EM_386
, 32, false)
1583 recognize(int machine
, int osabi
, int abiversion
);
1586 Target_i386
* target_
;
1589 // Recognize an i386 object file when we already know that the machine
1590 // number is EM_386.
1593 Target_selector_i386::recognize(int, int, int)
1595 if (this->target_
== NULL
)
1596 this->target_
= new Target_i386();
1597 return this->target_
;
1600 Target_selector_i386 target_selector_i386
;
1602 } // End anonymous namespace.