1 // s390.cc -- s390 target support for gold.
3 // Copyright (C) 2015-2016 Free Software Foundation, Inc.
4 // Written by Marcin KoĆcielnicki <koriakin@0x04.net>.
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.
29 #include "parameters.h"
36 #include "copy-relocs.h"
38 #include "target-reloc.h"
39 #include "target-select.h"
49 // A class to handle the .got.plt section.
52 class Output_data_got_plt_s390
: public Output_section_data_build
55 Output_data_got_plt_s390(Layout
* layout
)
56 : Output_section_data_build(size
/8),
60 Output_data_got_plt_s390(Layout
* layout
, off_t data_size
)
61 : Output_section_data_build(data_size
, size
/8),
66 // Write out the PLT data.
68 do_write(Output_file
*);
70 // Write to a map file.
72 do_print_to_mapfile(Mapfile
* mapfile
) const
73 { mapfile
->print_output_data(this, "** GOT PLT"); }
76 // A pointer to the Layout class, so that we can find the .dynamic
77 // section when we write out the GOT PLT section.
81 // A class to handle the PLT data.
84 class Output_data_plt_s390
: public Output_section_data
87 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, true>
90 Output_data_plt_s390(Layout
* layout
,
91 Output_data_got
<size
, true>* got
,
92 Output_data_got_plt_s390
<size
>* got_plt
,
93 Output_data_space
* got_irelative
)
94 : Output_section_data(4), layout_(layout
),
95 irelative_rel_(NULL
), got_(got
), got_plt_(got_plt
),
96 got_irelative_(got_irelative
), count_(0),
97 irelative_count_(0), free_list_()
98 { this->init(layout
); }
100 Output_data_plt_s390(Layout
* layout
,
101 Output_data_got
<size
, true>* got
,
102 Output_data_got_plt_s390
<size
>* got_plt
,
103 Output_data_space
* got_irelative
,
104 unsigned int plt_count
)
105 : Output_section_data((plt_count
+ 1) * plt_entry_size
,
107 layout_(layout
), irelative_rel_(NULL
), got_(got
),
108 got_plt_(got_plt
), got_irelative_(got_irelative
), count_(plt_count
),
109 irelative_count_(0), free_list_()
113 // Initialize the free list and reserve the first entry.
114 this->free_list_
.init((plt_count
+ 1) * plt_entry_size
, false);
115 this->free_list_
.remove(0, plt_entry_size
);
118 // Initialize the PLT section.
120 init(Layout
* layout
);
122 // Add an entry to the PLT.
124 add_entry(Symbol_table
*, Layout
*, Symbol
* gsym
);
126 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
128 add_local_ifunc_entry(Symbol_table
*, Layout
*,
129 Sized_relobj_file
<size
, true>*, unsigned int);
131 // Add the relocation for a PLT entry.
133 add_relocation(Symbol_table
*, Layout
*, Symbol
*, unsigned int);
135 // Return the .rela.plt section data.
138 { return this->rel_
; }
140 // Return where the IRELATIVE relocations should go in the PLT
143 rela_irelative(Symbol_table
*, Layout
*);
145 // Return whether we created a section for IRELATIVE relocations.
147 has_irelative_section() const
148 { return this->irelative_rel_
!= NULL
; }
150 // Return the number of PLT entries.
153 { return this->count_
+ this->irelative_count_
; }
155 // Return the offset of the first non-reserved PLT entry.
157 first_plt_entry_offset()
158 { return plt_entry_size
; }
160 // Return the size of a PLT entry.
162 get_plt_entry_size() const
163 { return plt_entry_size
; }
165 // Reserve a slot in the PLT for an existing symbol in an incremental update.
167 reserve_slot(unsigned int plt_index
)
169 this->free_list_
.remove((plt_index
+ 1) * plt_entry_size
,
170 (plt_index
+ 2) * plt_entry_size
);
173 // Return the PLT address to use for a global symbol.
175 address_for_global(const Symbol
*);
177 // Return the PLT address to use for a local symbol.
179 address_for_local(const Relobj
*, unsigned int symndx
);
181 // Add .eh_frame information for the PLT.
183 add_eh_frame(Layout
* layout
)
186 layout
->add_eh_frame_for_plt(this,
188 plt_eh_frame_cie_size
,
190 plt_eh_frame_fde_size
);
194 // Fill in the first PLT entry.
196 fill_first_plt_entry(unsigned char* pov
,
197 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
198 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
);
200 // Fill in a normal PLT entry. Returns the offset into the entry that
201 // should be the initial GOT slot value.
203 fill_plt_entry(unsigned char* pov
,
204 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
205 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
,
206 unsigned int got_offset
,
207 unsigned int plt_offset
,
208 unsigned int plt_rel_offset
);
211 do_adjust_output_section(Output_section
* os
);
213 // Write to a map file.
215 do_print_to_mapfile(Mapfile
* mapfile
) const
216 { mapfile
->print_output_data(this, _("** PLT")); }
219 // Set the final size.
221 set_final_data_size();
223 // Write out the PLT data.
225 do_write(Output_file
*);
227 // A pointer to the Layout class, so that we can find the .dynamic
228 // section when we write out the GOT PLT section.
230 // The reloc section.
232 // The IRELATIVE relocs, if necessary. These must follow the
233 // regular PLT relocations.
234 Reloc_section
* irelative_rel_
;
236 Output_data_got
<size
, true>* got_
;
237 // The .got.plt section.
238 Output_data_got_plt_s390
<size
>* got_plt_
;
239 // The part of the .got.plt section used for IRELATIVE relocs.
240 Output_data_space
* got_irelative_
;
241 // The number of PLT entries.
243 // Number of PLT entries with R_TILEGX_IRELATIVE relocs. These
244 // follow the regular PLT entries.
245 unsigned int irelative_count_
;
246 // List of available regions within the section, for incremental
248 Free_list free_list_
;
250 // The size of an entry in the PLT.
251 static const int plt_entry_size
= 0x20;
252 // The first entry in the PLT.
253 static const unsigned char first_plt_entry_32_abs
[plt_entry_size
];
254 static const unsigned char first_plt_entry_32_pic
[plt_entry_size
];
255 static const unsigned char first_plt_entry_64
[plt_entry_size
];
256 // Other entries in the PLT for an executable.
257 static const unsigned char plt_entry_32_abs
[plt_entry_size
];
258 static const unsigned char plt_entry_32_pic12
[plt_entry_size
];
259 static const unsigned char plt_entry_32_pic16
[plt_entry_size
];
260 static const unsigned char plt_entry_32_pic
[plt_entry_size
];
261 static const unsigned char plt_entry_64
[plt_entry_size
];
263 // The .eh_frame unwind information for the PLT.
264 static const int plt_eh_frame_cie_size
= 12;
265 static const unsigned char plt_eh_frame_cie
[plt_eh_frame_cie_size
];
266 static const int plt_eh_frame_fde_size
= 12;
267 static const unsigned char plt_eh_frame_fde
[plt_eh_frame_fde_size
];
272 class Target_s390
: public Sized_target
<size
, true>
275 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, true> Reloc_section
;
278 : Sized_target
<size
, true>(&s390_info
),
279 got_(NULL
), plt_(NULL
), got_plt_(NULL
), got_irelative_(NULL
),
280 global_offset_table_(NULL
), rela_dyn_(NULL
),
281 rela_irelative_(NULL
), copy_relocs_(elfcpp::R_390_COPY
),
282 got_mod_index_offset_(-1U), tls_base_symbol_defined_(false),
286 // Scan the relocations to look for symbol adjustments.
288 gc_process_relocs(Symbol_table
* symtab
,
290 Sized_relobj_file
<size
, true>* object
,
291 unsigned int data_shndx
,
292 unsigned int sh_type
,
293 const unsigned char* prelocs
,
295 Output_section
* output_section
,
296 bool needs_special_offset_handling
,
297 size_t local_symbol_count
,
298 const unsigned char* plocal_symbols
);
300 // Scan the relocations to look for symbol adjustments.
302 scan_relocs(Symbol_table
* symtab
,
304 Sized_relobj_file
<size
, true>* object
,
305 unsigned int data_shndx
,
306 unsigned int sh_type
,
307 const unsigned char* prelocs
,
309 Output_section
* output_section
,
310 bool needs_special_offset_handling
,
311 size_t local_symbol_count
,
312 const unsigned char* plocal_symbols
);
314 // Finalize the sections.
316 do_finalize_sections(Layout
*, const Input_objects
*, Symbol_table
*);
318 // Return the value to use for a dynamic which requires special
321 do_dynsym_value(const Symbol
*) const;
323 // Relocate a section.
325 relocate_section(const Relocate_info
<size
, true>*,
326 unsigned int sh_type
,
327 const unsigned char* prelocs
,
329 Output_section
* output_section
,
330 bool needs_special_offset_handling
,
332 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
333 section_size_type view_size
,
334 const Reloc_symbol_changes
*);
336 // Scan the relocs during a relocatable link.
338 scan_relocatable_relocs(Symbol_table
* symtab
,
340 Sized_relobj_file
<size
, true>* object
,
341 unsigned int data_shndx
,
342 unsigned int sh_type
,
343 const unsigned char* prelocs
,
345 Output_section
* output_section
,
346 bool needs_special_offset_handling
,
347 size_t local_symbol_count
,
348 const unsigned char* plocal_symbols
,
349 Relocatable_relocs
*);
351 // Scan the relocs for --emit-relocs.
353 emit_relocs_scan(Symbol_table
* symtab
,
355 Sized_relobj_file
<size
, true>* object
,
356 unsigned int data_shndx
,
357 unsigned int sh_type
,
358 const unsigned char* prelocs
,
360 Output_section
* output_section
,
361 bool needs_special_offset_handling
,
362 size_t local_symbol_count
,
363 const unsigned char* plocal_syms
,
364 Relocatable_relocs
* rr
);
366 // Return a string used to fill a code section with nops.
368 do_code_fill(section_size_type length
) const;
370 // Emit relocations for a section.
373 const Relocate_info
<size
, true>*,
374 unsigned int sh_type
,
375 const unsigned char* prelocs
,
377 Output_section
* output_section
,
378 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
380 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
381 section_size_type view_size
,
382 unsigned char* reloc_view
,
383 section_size_type reloc_view_size
);
385 // Return whether SYM is defined by the ABI.
387 do_is_defined_by_abi(const Symbol
* sym
) const
388 { return strcmp(sym
->name(), "__tls_get_offset") == 0; }
390 // Return the PLT address to use for a global symbol.
392 do_plt_address_for_global(const Symbol
* gsym
) const
393 { return this->plt_section()->address_for_global(gsym
); }
396 do_plt_address_for_local(const Relobj
* relobj
, unsigned int symndx
) const
397 { return this->plt_section()->address_for_local(relobj
, symndx
); }
399 // Return the offset to use for the GOT_INDX'th got entry which is
400 // for a local tls symbol specified by OBJECT, SYMNDX.
402 do_tls_offset_for_local(const Relobj
* object
,
404 unsigned int got_indx
) const;
406 // Return the offset to use for the GOT_INDX'th got entry which is
407 // for global tls symbol GSYM.
409 do_tls_offset_for_global(Symbol
* gsym
, unsigned int got_indx
) const;
411 // This function should be defined in targets that can use relocation
412 // types to determine (implemented in local_reloc_may_be_function_pointer
413 // and global_reloc_may_be_function_pointer)
414 // if a function's pointer is taken. ICF uses this in safe mode to only
415 // fold those functions whose pointer is defintely not taken.
417 do_can_check_for_function_pointers() const
420 // Return whether SYM is call to a non-split function.
422 do_is_call_to_non_split(const Symbol
* sym
, const unsigned char* preloc
,
423 const unsigned char* view
,
424 section_size_type view_size
) const;
426 // Adjust -fsplit-stack code which calls non-split-stack code.
428 do_calls_non_split(Relobj
* object
, unsigned int shndx
,
429 section_offset_type fnoffset
, section_size_type fnsize
,
430 const unsigned char* prelocs
, size_t reloc_count
,
431 unsigned char* view
, section_size_type view_size
,
432 std::string
* from
, std::string
* to
) const;
434 // Return the size of the GOT section.
438 gold_assert(this->got_
!= NULL
);
439 return this->got_
->data_size();
442 // Return the number of entries in the GOT.
444 got_entry_count() const
446 if (this->got_
== NULL
)
448 return this->got_size() / (size
/ 8);
451 // Return the number of entries in the PLT.
453 plt_entry_count() const;
455 // Return the offset of the first non-reserved PLT entry.
457 first_plt_entry_offset() const;
459 // Return the size of each PLT entry.
461 plt_entry_size() const;
463 // Create the GOT section for an incremental update.
464 Output_data_got_base
*
465 init_got_plt_for_update(Symbol_table
* symtab
,
467 unsigned int got_count
,
468 unsigned int plt_count
);
470 // Reserve a GOT entry for a local symbol, and regenerate any
471 // necessary dynamic relocations.
473 reserve_local_got_entry(unsigned int got_index
,
474 Sized_relobj
<size
, true>* obj
,
476 unsigned int got_type
);
478 // Reserve a GOT entry for a global symbol, and regenerate any
479 // necessary dynamic relocations.
481 reserve_global_got_entry(unsigned int got_index
, Symbol
* gsym
,
482 unsigned int got_type
);
484 // Register an existing PLT entry for a global symbol.
486 register_global_plt_entry(Symbol_table
*, Layout
*, unsigned int plt_index
,
489 // Force a COPY relocation for a given symbol.
491 emit_copy_reloc(Symbol_table
*, Symbol
*, Output_section
*, off_t
);
493 // Apply an incremental relocation.
495 apply_relocation(const Relocate_info
<size
, true>* relinfo
,
496 typename
elfcpp::Elf_types
<size
>::Elf_Addr r_offset
,
498 typename
elfcpp::Elf_types
<size
>::Elf_Swxword r_addend
,
501 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
502 section_size_type view_size
);
506 // The class which scans relocations.
511 : issued_non_pic_error_(false)
515 get_reference_flags(unsigned int r_type
);
518 local(Symbol_table
* symtab
, Layout
* layout
, Target_s390
* target
,
519 Sized_relobj_file
<size
, true>* object
,
520 unsigned int data_shndx
,
521 Output_section
* output_section
,
522 const elfcpp::Rela
<size
, true>& reloc
, unsigned int r_type
,
523 const elfcpp::Sym
<size
, true>& lsym
,
527 global(Symbol_table
* symtab
, Layout
* layout
, Target_s390
* target
,
528 Sized_relobj_file
<size
, true>* object
,
529 unsigned int data_shndx
,
530 Output_section
* output_section
,
531 const elfcpp::Rela
<size
, true>& reloc
, unsigned int r_type
,
535 local_reloc_may_be_function_pointer(Symbol_table
* symtab
, Layout
* layout
,
537 Sized_relobj_file
<size
, true>* object
,
538 unsigned int data_shndx
,
539 Output_section
* output_section
,
540 const elfcpp::Rela
<size
, true>& reloc
,
542 const elfcpp::Sym
<size
, true>& lsym
);
545 global_reloc_may_be_function_pointer(Symbol_table
* symtab
, Layout
* layout
,
547 Sized_relobj_file
<size
, true>* object
,
548 unsigned int data_shndx
,
549 Output_section
* output_section
,
550 const elfcpp::Rela
<size
, true>& reloc
,
556 unsupported_reloc_local(Sized_relobj_file
<size
, true>*,
557 unsigned int r_type
);
560 unsupported_reloc_global(Sized_relobj_file
<size
, true>*,
561 unsigned int r_type
, Symbol
*);
564 check_non_pic(Relobj
*, unsigned int r_type
);
567 possible_function_pointer_reloc(unsigned int r_type
);
570 reloc_needs_plt_for_ifunc(Sized_relobj_file
<size
, true>*,
571 unsigned int r_type
);
573 // Whether we have issued an error about a non-PIC compilation.
574 bool issued_non_pic_error_
;
577 // The class which implements relocation.
581 // Do a relocation. Return false if the caller should not issue
582 // any warnings about this relocation.
584 relocate(const Relocate_info
<size
, true>*, unsigned int,
585 Target_s390
*, Output_section
*, size_t, const unsigned char*,
586 const Sized_symbol
<size
>*, const Symbol_value
<size
>*,
587 unsigned char*, typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
591 // Do a TLS relocation.
592 inline typename
elfcpp::Elf_types
<size
>::Elf_Addr
593 relocate_tls(const Relocate_info
<size
, true>*, Target_s390
*,
594 size_t relnum
, const elfcpp::Rela
<size
, true>&,
595 unsigned int r_type
, const Sized_symbol
<size
>*,
596 const Symbol_value
<size
>*,
597 unsigned char*, section_size_type
);
599 // Do a TLS General-Dynamic to Initial-Exec transition.
601 tls_gd_to_ie(const Relocate_info
<size
, true>*, size_t relnum
,
602 const elfcpp::Rela
<size
, true>&,
604 section_size_type view_size
);
606 // Do a TLS General-Dynamic to Local-Exec transition.
608 tls_gd_to_le(const Relocate_info
<size
, true>*, size_t relnum
,
609 const elfcpp::Rela
<size
, true>&,
611 section_size_type view_size
);
613 // Do a TLS Local-Dynamic to Local-Exec transition.
615 tls_ld_to_le(const Relocate_info
<size
, true>*, size_t relnum
,
616 const elfcpp::Rela
<size
, true>&,
618 section_size_type view_size
);
620 // Do a TLS Initial-Exec to Local-Exec transition.
622 tls_ie_to_le(const Relocate_info
<size
, true>*, size_t relnum
,
623 const elfcpp::Rela
<size
, true>&,
625 section_size_type view_size
);
628 // Adjust TLS relocation type based on the options and whether this
629 // is a local symbol.
630 static tls::Tls_optimization
631 optimize_tls_reloc(bool is_final
, int r_type
);
633 // Get the GOT section.
634 const Output_data_got
<size
, true>*
637 gold_assert(this->got_
!= NULL
);
641 // Get the GOT section, creating it if necessary.
642 Output_data_got
<size
, true>*
643 got_section(Symbol_table
*, Layout
*);
645 typename
elfcpp::Elf_types
<size
>::Elf_Addr
648 gold_assert(this->got_
!= NULL
);
649 return this->got_plt_
->address();
652 typename
elfcpp::Elf_types
<size
>::Elf_Addr
653 got_main_offset() const
655 gold_assert(this->got_
!= NULL
);
656 return this->got_
->address() - this->got_address();
659 // Create the PLT section.
661 make_plt_section(Symbol_table
* symtab
, Layout
* layout
);
663 // Create a PLT entry for a global symbol.
665 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
667 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
669 make_local_ifunc_plt_entry(Symbol_table
*, Layout
*,
670 Sized_relobj_file
<size
, true>* relobj
,
671 unsigned int local_sym_index
);
673 // Create a GOT entry for the TLS module index.
675 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
676 Sized_relobj_file
<size
, true>* object
);
678 // Get the PLT section.
679 Output_data_plt_s390
<size
>*
682 gold_assert(this->plt_
!= NULL
);
686 // Get the dynamic reloc section, creating it if necessary.
688 rela_dyn_section(Layout
*);
690 // Get the section to use for IRELATIVE relocations.
692 rela_irelative_section(Layout
*);
694 // Add a potential copy relocation.
696 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
697 Sized_relobj_file
<size
, true>* object
,
698 unsigned int shndx
, Output_section
* output_section
,
699 Symbol
* sym
, const elfcpp::Rela
<size
, true>& reloc
)
701 unsigned int r_type
= elfcpp::elf_r_type
<size
>(reloc
.get_r_info());
702 this->copy_relocs_
.copy_reloc(symtab
, layout
,
703 symtab
->get_sized_symbol
<size
>(sym
),
704 object
, shndx
, output_section
,
705 r_type
, reloc
.get_r_offset(),
706 reloc
.get_r_addend(),
707 this->rela_dyn_section(layout
));
710 // A function for targets to call. Return whether BYTES/LEN matches
711 // VIEW/VIEW_SIZE at OFFSET. Like the one in Target, but takes
712 // an unsigned char * parameter.
714 match_view_u(const unsigned char* view
, section_size_type view_size
,
715 section_offset_type offset
, const unsigned char* bytes
, size_t len
) const
717 return this->match_view(view
, view_size
, offset
,
718 reinterpret_cast<const char*>(bytes
), len
);
721 // Information about this specific target which we pass to the
722 // general Target structure.
723 static Target::Target_info s390_info
;
725 // The types of GOT entries needed for this platform.
726 // These values are exposed to the ABI in an incremental link.
727 // Do not renumber existing values without changing the version
728 // number of the .gnu_incremental_inputs section.
731 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
732 GOT_TYPE_TLS_OFFSET
= 1, // GOT entry for TLS offset
733 GOT_TYPE_TLS_PAIR
= 2, // GOT entry for TLS module/offset pair
737 Output_data_got
<size
, true>* got_
;
739 Output_data_plt_s390
<size
>* plt_
;
740 // The GOT PLT section.
741 Output_data_got_plt_s390
<size
>* got_plt_
;
742 // The GOT section for IRELATIVE relocations.
743 Output_data_space
* got_irelative_
;
744 // The _GLOBAL_OFFSET_TABLE_ symbol.
745 Symbol
* global_offset_table_
;
746 // The dynamic reloc section.
747 Reloc_section
* rela_dyn_
;
748 // The section to use for IRELATIVE relocs.
749 Reloc_section
* rela_irelative_
;
750 // Relocs saved to avoid a COPY reloc.
751 Copy_relocs
<elfcpp::SHT_RELA
, size
, true> copy_relocs_
;
752 // Offset of the GOT entry for the TLS module index.
753 unsigned int got_mod_index_offset_
;
754 // True if the _TLS_MODULE_BASE_ symbol has been defined.
755 bool tls_base_symbol_defined_
;
756 // For use in do_tls_offset_for_*
759 // Code sequences for -fsplit-stack matching.
760 static const unsigned char ss_code_bras_8
[];
761 static const unsigned char ss_code_l_basr
[];
762 static const unsigned char ss_code_a_basr
[];
763 static const unsigned char ss_code_larl
[];
764 static const unsigned char ss_code_brasl
[];
765 static const unsigned char ss_code_jg
[];
766 static const unsigned char ss_code_jgl
[];
768 // Variable code sequence matchers for -fsplit-stack.
769 bool ss_match_st_r14(unsigned char* view
,
770 section_size_type view_size
,
771 section_offset_type
*offset
) const;
772 bool ss_match_l_r14(unsigned char* view
,
773 section_size_type view_size
,
774 section_offset_type
*offset
) const;
775 bool ss_match_mcount(unsigned char* view
,
776 section_size_type view_size
,
777 section_offset_type
*offset
) const;
778 bool ss_match_ear(unsigned char* view
,
779 section_size_type view_size
,
780 section_offset_type
*offset
) const;
781 bool ss_match_c(unsigned char* view
,
782 section_size_type view_size
,
783 section_offset_type
*offset
) const;
784 bool ss_match_l(unsigned char* view
,
785 section_size_type view_size
,
786 section_offset_type
*offset
,
787 int *guard_reg
) const;
788 bool ss_match_ahi(unsigned char* view
,
789 section_size_type view_size
,
790 section_offset_type
*offset
,
792 uint32_t *arg
) const;
793 bool ss_match_alfi(unsigned char* view
,
794 section_size_type view_size
,
795 section_offset_type
*offset
,
797 uint32_t *arg
) const;
798 bool ss_match_cr(unsigned char* view
,
799 section_size_type view_size
,
800 section_offset_type
*offset
,
801 int guard_reg
) const;
805 Target::Target_info Target_s390
<32>::s390_info
=
808 true, // is_big_endian
809 elfcpp::EM_S390
, // machine_code
810 false, // has_make_symbol
811 false, // has_resolve
812 true, // has_code_fill
813 true, // is_default_stack_executable
814 true, // can_icf_inline_merge_sections
816 "/lib/ld.so.1", // dynamic_linker
817 0x00400000, // default_text_segment_address
818 4 * 1024, // abi_pagesize (overridable by -z max-page-size)
819 4 * 1024, // common_pagesize (overridable by -z common-page-size)
820 false, // isolate_execinstr
822 elfcpp::SHN_UNDEF
, // small_common_shndx
823 elfcpp::SHN_UNDEF
, // large_common_shndx
824 0, // small_common_section_flags
825 0, // large_common_section_flags
826 NULL
, // attributes_section
827 NULL
, // attributes_vendor
828 "_start", // entry_symbol_name
829 32, // hash_entry_size
833 Target::Target_info Target_s390
<64>::s390_info
=
836 true, // is_big_endian
837 elfcpp::EM_S390
, // machine_code
838 false, // has_make_symbol
839 false, // has_resolve
840 true, // has_code_fill
841 true, // is_default_stack_executable
842 true, // can_icf_inline_merge_sections
844 "/lib/ld64.so.1", // dynamic_linker
845 0x80000000ll
, // default_text_segment_address
846 4 * 1024, // abi_pagesize (overridable by -z max-page-size)
847 4 * 1024, // common_pagesize (overridable by -z common-page-size)
848 false, // isolate_execinstr
850 elfcpp::SHN_UNDEF
, // small_common_shndx
851 elfcpp::SHN_UNDEF
, // large_common_shndx
852 0, // small_common_section_flags
853 0, // large_common_section_flags
854 NULL
, // attributes_section
855 NULL
, // attributes_vendor
856 "_start", // entry_symbol_name
857 64, // hash_entry_size
861 class S390_relocate_functions
881 typedef S390_relocate_functions
<size
> This
;
882 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
884 template<int valsize
>
886 has_overflow_signed(Address value
)
888 // limit = 1 << (valsize - 1) without shift count exceeding size of type
889 Address limit
= static_cast<Address
>(1) << ((valsize
- 1) >> 1);
890 limit
<<= ((valsize
- 1) >> 1);
891 limit
<<= ((valsize
- 1) - 2 * ((valsize
- 1) >> 1));
892 return value
+ limit
> (limit
<< 1) - 1;
895 template<int valsize
>
897 has_overflow_unsigned(Address value
)
899 Address limit
= static_cast<Address
>(1) << ((valsize
- 1) >> 1);
900 limit
<<= ((valsize
- 1) >> 1);
901 limit
<<= ((valsize
- 1) - 2 * ((valsize
- 1) >> 1));
902 return value
> (limit
<< 1) - 1;
905 template<int fieldsize
>
907 rela(unsigned char* view
, Address mask
, Address value
)
909 typedef typename
elfcpp::Swap
<fieldsize
, true>::Valtype Valtype
;
910 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
911 Valtype val
= elfcpp::Swap
<fieldsize
, true>::readval(view
);
914 elfcpp::Swap
<fieldsize
, true>::writeval(wv
, val
| value
);
918 // R_390_12, R_390_GOT12, R_390_GOTPLT12, R_390_GOTIE12
920 rela12(unsigned char* view
, Address value
)
922 if (This::template has_overflow_unsigned
<12>(value
))
923 return STATUS_OVERFLOW
;
924 This::template rela
<16>(view
, 0x0fff, value
);
928 // R_390_16, R_390_GOT16, R_390_GOTPLT16, R_390_GOTOFF16, R_390_PLTOFF16
930 rela16(unsigned char* view
, Address value
)
932 if (This::template has_overflow_signed
<16>(value
))
933 return STATUS_OVERFLOW
;
934 This::template rela
<16>(view
, 0xffff, value
);
938 // R_390_20, R_390_GOT20, R_390_GOTPLT20, R_390_GOTIE20
940 rela20(unsigned char* view
, Address value
)
942 if (This::template has_overflow_signed
<20>(value
))
943 return STATUS_OVERFLOW
;
944 This::template rela
<16>(view
, 0x0fff, value
);
945 This::template rela
<16>(view
+ 2, 0xff00, value
>> (12 - 8));
949 // R_390_PC12DBL, R_390_PLT12DBL
951 pcrela12dbl(unsigned char* view
, Address value
, Address address
)
954 if ((value
& 1) != 0)
955 return STATUS_OVERFLOW
;
956 if (This::template has_overflow_signed
<13>(value
))
957 return STATUS_OVERFLOW
;
959 This::template rela
<16>(view
, 0x0fff, value
);
963 // R_390_PC16DBL, R_390_PLT16DBL
965 pcrela16dbl(unsigned char* view
, Address value
, Address address
)
968 if ((value
& 1) != 0)
969 return STATUS_OVERFLOW
;
970 if (This::template has_overflow_signed
<17>(value
))
971 return STATUS_OVERFLOW
;
973 This::template rela
<16>(view
, 0xffff, value
);
977 // R_390_PC24DBL, R_390_PLT24DBL
979 pcrela24dbl(unsigned char* view
, Address value
, Address address
)
982 if ((value
& 1) != 0)
983 return STATUS_OVERFLOW
;
984 if (This::template has_overflow_signed
<25>(value
))
985 return STATUS_OVERFLOW
;
987 // Swap doesn't take 24-bit fields well...
988 This::template rela
<8>(view
, 0xff, value
>> 16);
989 This::template rela
<16>(view
+ 1, 0xffff, value
);
993 // R_390_PC32DBL, R_390_PLT32DBL, R_390_GOTPCDBL, R_390_GOTENT, R_390_GOTPLTENT
995 pcrela32dbl(unsigned char* view
, Address value
, Address address
)
997 Address reloc
= value
- address
;
998 if ((reloc
& 1) != 0)
1000 gold_warning(_("R_390_PC32DBL target misaligned at %llx"), (long long)address
);
1001 // Wait for a fix for https://sourceware.org/bugzilla/show_bug.cgi?id=18960
1002 // return STATUS_OVERFLOW;
1004 if (This::template has_overflow_signed
<33>(reloc
))
1005 return STATUS_OVERFLOW
;
1007 if (value
< address
&& size
== 32)
1008 reloc
|= 0x80000000;
1009 This::template rela
<32>(view
, 0xffffffff, reloc
);
1015 // Initialize the PLT section.
1019 Output_data_plt_s390
<size
>::init(Layout
* layout
)
1021 this->rel_
= new Reloc_section(false);
1022 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
1023 elfcpp::SHF_ALLOC
, this->rel_
,
1024 ORDER_DYNAMIC_PLT_RELOCS
, false);
1029 Output_data_plt_s390
<size
>::do_adjust_output_section(Output_section
* os
)
1031 os
->set_entsize(plt_entry_size
);
1034 // Add an entry to the PLT.
1038 Output_data_plt_s390
<size
>::add_entry(Symbol_table
* symtab
, Layout
* layout
,
1041 gold_assert(!gsym
->has_plt_offset());
1043 unsigned int plt_index
;
1045 section_offset_type got_offset
;
1047 unsigned int* pcount
;
1048 unsigned int offset
;
1049 unsigned int reserved
;
1050 Output_section_data_build
* got
;
1051 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
1052 && gsym
->can_use_relative_reloc(false))
1054 pcount
= &this->irelative_count_
;
1057 got
= this->got_irelative_
;
1061 pcount
= &this->count_
;
1064 got
= this->got_plt_
;
1067 if (!this->is_data_size_valid())
1069 // Note that when setting the PLT offset for a non-IRELATIVE
1070 // entry we skip the initial reserved PLT entry.
1071 plt_index
= *pcount
+ offset
;
1072 plt_offset
= plt_index
* plt_entry_size
;
1076 got_offset
= (plt_index
- offset
+ reserved
) * size
/ 8;
1077 gold_assert(got_offset
== got
->current_data_size());
1079 // Every PLT entry needs a GOT entry which points back to the PLT
1080 // entry (this will be changed by the dynamic linker, normally
1081 // lazily when the function is called).
1082 got
->set_current_data_size(got_offset
+ size
/ 8);
1086 // FIXME: This is probably not correct for IRELATIVE relocs.
1088 // For incremental updates, find an available slot.
1089 plt_offset
= this->free_list_
.allocate(plt_entry_size
,
1091 if (plt_offset
== -1)
1092 gold_fallback(_("out of patch space (PLT);"
1093 " relink with --incremental-full"));
1095 // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset
1096 // can be calculated from the PLT index, adjusting for the three
1097 // reserved entries at the beginning of the GOT.
1098 plt_index
= plt_offset
/ plt_entry_size
- 1;
1099 got_offset
= (plt_index
- offset
+ reserved
) * size
/ 8;
1102 gsym
->set_plt_offset(plt_offset
);
1104 // Every PLT entry needs a reloc.
1105 this->add_relocation(symtab
, layout
, gsym
, got_offset
);
1107 // Note that we don't need to save the symbol. The contents of the
1108 // PLT are independent of which symbols are used. The symbols only
1109 // appear in the relocations.
1112 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
1117 Output_data_plt_s390
<size
>::add_local_ifunc_entry(
1118 Symbol_table
* symtab
,
1120 Sized_relobj_file
<size
, true>* relobj
,
1121 unsigned int local_sym_index
)
1123 unsigned int plt_offset
= this->irelative_count_
* plt_entry_size
;
1124 ++this->irelative_count_
;
1126 section_offset_type got_offset
= this->got_irelative_
->current_data_size();
1128 // Every PLT entry needs a GOT entry which points back to the PLT
1130 this->got_irelative_
->set_current_data_size(got_offset
+ size
/ 8);
1132 // Every PLT entry needs a reloc.
1133 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
1134 rela
->add_symbolless_local_addend(relobj
, local_sym_index
,
1135 elfcpp::R_390_IRELATIVE
,
1136 this->got_irelative_
, got_offset
, 0);
1141 // Add the relocation for a PLT entry.
1145 Output_data_plt_s390
<size
>::add_relocation(Symbol_table
* symtab
,
1148 unsigned int got_offset
)
1150 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
1151 && gsym
->can_use_relative_reloc(false))
1153 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
1154 rela
->add_symbolless_global_addend(gsym
, elfcpp::R_390_IRELATIVE
,
1155 this->got_irelative_
, got_offset
, 0);
1159 gsym
->set_needs_dynsym_entry();
1160 this->rel_
->add_global(gsym
, elfcpp::R_390_JMP_SLOT
, this->got_plt_
,
1165 // Return where the IRELATIVE relocations should go in the PLT. These
1166 // follow the JUMP_SLOT and the TLSDESC relocations.
1169 typename Output_data_plt_s390
<size
>::Reloc_section
*
1170 Output_data_plt_s390
<size
>::rela_irelative(Symbol_table
* symtab
,
1173 if (this->irelative_rel_
== NULL
)
1175 this->irelative_rel_
= new Reloc_section(false);
1176 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
1177 elfcpp::SHF_ALLOC
, this->irelative_rel_
,
1178 ORDER_DYNAMIC_PLT_RELOCS
, false);
1179 gold_assert(this->irelative_rel_
->output_section()
1180 == this->rel_
->output_section());
1182 if (parameters
->doing_static_link())
1184 // A statically linked executable will only have a .rela.plt
1185 // section to hold R_390_IRELATIVE relocs for
1186 // STT_GNU_IFUNC symbols. The library will use these
1187 // symbols to locate the IRELATIVE relocs at program startup
1189 symtab
->define_in_output_data("__rela_iplt_start", NULL
,
1190 Symbol_table::PREDEFINED
,
1191 this->irelative_rel_
, 0, 0,
1192 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
1193 elfcpp::STV_HIDDEN
, 0, false, true);
1194 symtab
->define_in_output_data("__rela_iplt_end", NULL
,
1195 Symbol_table::PREDEFINED
,
1196 this->irelative_rel_
, 0, 0,
1197 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
1198 elfcpp::STV_HIDDEN
, 0, true, true);
1201 return this->irelative_rel_
;
1204 // Return the PLT address to use for a global symbol.
1208 Output_data_plt_s390
<size
>::address_for_global(const Symbol
* gsym
)
1210 uint64_t offset
= 0;
1211 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
1212 && gsym
->can_use_relative_reloc(false))
1213 offset
= (this->count_
+ 1) * plt_entry_size
;
1214 return this->address() + offset
+ gsym
->plt_offset();
1217 // Return the PLT address to use for a local symbol. These are always
1218 // IRELATIVE relocs.
1222 Output_data_plt_s390
<size
>::address_for_local(const Relobj
* object
,
1225 return (this->address()
1226 + (this->count_
+ 1) * plt_entry_size
1227 + object
->local_plt_offset(r_sym
));
1230 // Set the final size.
1233 Output_data_plt_s390
<size
>::set_final_data_size()
1235 unsigned int count
= this->count_
+ this->irelative_count_
;
1236 this->set_data_size((count
+ 1) * plt_entry_size
);
1241 Output_data_plt_s390
<size
>::first_plt_entry_32_abs
[plt_entry_size
] =
1243 0x50, 0x10, 0xf0, 0x1c, // st %r1, 28(%r15)
1244 0x0d, 0x10, // basr %r1, %r0
1245 0x58, 0x10, 0x10, 0x12, // l %r1, 18(%r1)
1246 0xd2, 0x03, 0xf0, 0x18, 0x10, 0x04, // mvc 24(4,%r15), 4(%r1)
1247 0x58, 0x10, 0x10, 0x08, // l %r1, 8(%r1)
1248 0x07, 0xf1, // br %r1
1249 0x00, 0x00, // padding
1250 0x00, 0x00, 0x00, 0x00, // _GLOBAL_OFFSET_TABLE_ (to fill)
1251 0x00, 0x00, 0x00, 0x00, // padding
1256 Output_data_plt_s390
<size
>::first_plt_entry_32_pic
[plt_entry_size
] =
1258 0x50, 0x10, 0xf0, 0x1c, // st %r1, 28(%r15)
1259 0x58, 0x10, 0xc0, 0x04, // l %r1, 4(%r12)
1260 0x50, 0x10, 0xf0, 0x18, // st %r1, 24(%r15)
1261 0x58, 0x10, 0xc0, 0x08, // l %r1, 8(%r12)
1262 0x07, 0xf1, // br %r1
1263 0x00, 0x00, // padding
1264 0x00, 0x00, 0x00, 0x00, // padding
1265 0x00, 0x00, 0x00, 0x00, // padding
1266 0x00, 0x00, 0x00, 0x00, // padding
1271 Output_data_plt_s390
<size
>::first_plt_entry_64
[plt_entry_size
] =
1273 0xe3, 0x10, 0xf0, 0x38, 0x00, 0x24, // stg %r1, 56(%r15)
1274 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, // larl %r1, _GLOBAL_OFFSET_TABLE_ (to fill)
1275 0xd2, 0x07, 0xf0, 0x30, 0x10, 0x08, // mvc 48(8,%r15), 8(%r1)
1276 0xe3, 0x10, 0x10, 0x10, 0x00, 0x04, // lg %r1, 16(%r1)
1277 0x07, 0xf1, // br %r1
1285 Output_data_plt_s390
<size
>::fill_first_plt_entry(
1287 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
1288 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
)
1292 memcpy(pov
, first_plt_entry_64
, plt_entry_size
);
1293 S390_relocate_functions
<size
>::pcrela32dbl(pov
+ 8, got_address
, (plt_address
+ 6));
1295 else if (!parameters
->options().output_is_position_independent())
1297 memcpy(pov
, first_plt_entry_32_abs
, plt_entry_size
);
1298 elfcpp::Swap
<32, true>::writeval(pov
+ 24, got_address
);
1302 memcpy(pov
, first_plt_entry_32_pic
, plt_entry_size
);
1308 Output_data_plt_s390
<size
>::plt_entry_32_abs
[plt_entry_size
] =
1311 0x0d, 0x10, // basr %r1, %r0
1312 0x58, 0x10, 0x10, 0x16, // l %r1, 22(%r1)
1313 0x58, 0x10, 0x10, 0x00, // l %r1, 0(%r1)
1314 0x07, 0xf1, // br %r1
1316 0x0d, 0x10, // basr %r1, %r0
1317 0x58, 0x10, 0x10, 0x0e, // l %r1, 14(%r1)
1318 0xa7, 0xf4, 0x00, 0x00, // j first_plt_entry (to fill)
1319 0x00, 0x00, // padding
1320 0x00, 0x00, 0x00, 0x00, // _GLOBAL_OFFSET_TABLE_+sym@gotplt (to fill)
1321 0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill)
1326 Output_data_plt_s390
<size
>::plt_entry_32_pic12
[plt_entry_size
] =
1329 0x58, 0x10, 0xc0, 0x00, // l %r1, sym@gotplt(%r12) (to fill)
1330 0x07, 0xf1, // br %r1
1331 0x00, 0x00, // padding
1332 0x00, 0x00, 0x00, 0x00, // padding
1334 0x0d, 0x10, // basr %r1, %r0
1335 0x58, 0x10, 0x10, 0x0e, // l %r1, 14(%r1)
1336 0xa7, 0xf4, 0x00, 0x00, // j first_plt_entry (to fill)
1337 0x00, 0x00, // padding
1338 0x00, 0x00, 0x00, 0x00, // padding
1339 0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill)
1344 Output_data_plt_s390
<size
>::plt_entry_32_pic16
[plt_entry_size
] =
1347 0xa7, 0x18, 0x00, 0x00, // lhi %r1, sym@gotplt (to fill)
1348 0x58, 0x11, 0xc0, 0x00, // l %r1, 0(%r1, %r12)
1349 0x07, 0xf1, // br %r1
1350 0x00, 0x00, // padding
1352 0x0d, 0x10, // basr %r1, %r0
1353 0x58, 0x10, 0x10, 0x0e, // l %r1, 14(%r1)
1354 0xa7, 0xf4, 0x00, 0x00, // j first_plt_entry (to fill)
1355 0x00, 0x00, // padding
1356 0x00, 0x00, 0x00, 0x00, // padding
1357 0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill)
1362 Output_data_plt_s390
<size
>::plt_entry_32_pic
[plt_entry_size
] =
1365 0x0d, 0x10, // basr %r1, %r0
1366 0x58, 0x10, 0x10, 0x16, // l %r1, 22(%r1)
1367 0x58, 0x11, 0xc0, 0x00, // l %r1, 0(%r1, %r12)
1368 0x07, 0xf1, // br %r1
1370 0x0d, 0x10, // basr %r1, %r0
1371 0x58, 0x10, 0x10, 0x0e, // l %r1, 14(%r1)
1372 0xa7, 0xf4, 0x00, 0x00, // j first_plt_entry (to fill)
1373 0x00, 0x00, // padding
1374 0x00, 0x00, 0x00, 0x00, // sym@gotplt (to fill)
1375 0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill)
1380 Output_data_plt_s390
<size
>::plt_entry_64
[plt_entry_size
] =
1383 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, // larl %r1, _GLOBAL_OFFSET_TABLE_+off (to fill)
1384 0xe3, 0x10, 0x10, 0x00, 0x00, 0x04, // lg %r1, 0(%r1)
1385 0x07, 0xf1, // br %r1
1387 0x0d, 0x10, // basr %r1, %r0
1388 0xe3, 0x10, 0x10, 0x0c, 0x00, 0x14, // lgf %r1, 12(%r1)
1389 0xc0, 0xf4, 0x00, 0x00, 0x00, 0x00, // jg first_plt_entry (to fill)
1390 0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill)
1395 Output_data_plt_s390
<size
>::fill_plt_entry(
1397 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
1398 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
,
1399 unsigned int got_offset
,
1400 unsigned int plt_offset
,
1401 unsigned int plt_rel_offset
)
1405 memcpy(pov
, plt_entry_64
, plt_entry_size
);
1406 S390_relocate_functions
<size
>::pcrela32dbl(pov
+ 2, got_address
+ got_offset
, plt_address
+ plt_offset
);
1407 S390_relocate_functions
<size
>::pcrela32dbl(pov
+ 24, plt_address
, plt_address
+ plt_offset
+ 22);
1411 if (!parameters
->options().output_is_position_independent())
1413 memcpy(pov
, plt_entry_32_abs
, plt_entry_size
);
1414 elfcpp::Swap
<32, true>::writeval(pov
+ 24, got_address
+ got_offset
);
1418 if (got_offset
< 0x1000)
1420 memcpy(pov
, plt_entry_32_pic12
, plt_entry_size
);
1421 S390_relocate_functions
<size
>::rela12(pov
+ 2, got_offset
);
1423 else if (got_offset
< 0x8000)
1425 memcpy(pov
, plt_entry_32_pic16
, plt_entry_size
);
1426 S390_relocate_functions
<size
>::rela16(pov
+ 2, got_offset
);
1430 memcpy(pov
, plt_entry_32_pic
, plt_entry_size
);
1431 elfcpp::Swap
<32, true>::writeval(pov
+ 24, got_offset
);
1434 typename
elfcpp::Elf_types
<size
>::Elf_Addr target
= plt_address
;
1435 if (plt_offset
>= 0x10000)
1437 // Would overflow pcrela16dbl - aim at the farthest previous jump
1439 if (plt_offset
> 0x10000)
1441 // Use the full range of pcrel16dbl.
1442 target
= plt_address
+ plt_offset
- 0x10000 + 18;
1446 // if plt_offset is exactly 0x10000, the above would aim at 18th byte
1447 // of first_plt_entry, which doesn't have the jump back like the others.
1448 // Aim at the next entry instead.
1449 target
= plt_address
+ plt_offset
- 0xffe0 + 18;
1452 S390_relocate_functions
<size
>::pcrela16dbl(pov
+ 20, target
, plt_address
+ plt_offset
+ 18);
1454 elfcpp::Swap
<32, true>::writeval(pov
+ 28, plt_rel_offset
);
1461 // The .eh_frame unwind information for the PLT.
1465 Output_data_plt_s390
<32>::plt_eh_frame_cie
[plt_eh_frame_cie_size
] =
1468 'z', // Augmentation: augmentation size included.
1469 'R', // Augmentation: FDE encoding included.
1470 '\0', // End of augmentation string.
1471 1, // Code alignment factor.
1472 0x7c, // Data alignment factor.
1473 14, // Return address column.
1474 1, // Augmentation size.
1475 (elfcpp::DW_EH_PE_pcrel
// FDE encoding.
1476 | elfcpp::DW_EH_PE_sdata4
),
1477 elfcpp::DW_CFA_def_cfa
, 15, 0x60, // DW_CFA_def_cfa: r15 ofs 0x60.
1482 Output_data_plt_s390
<64>::plt_eh_frame_cie
[plt_eh_frame_cie_size
] =
1485 'z', // Augmentation: augmentation size included.
1486 'R', // Augmentation: FDE encoding included.
1487 '\0', // End of augmentation string.
1488 1, // Code alignment factor.
1489 0x78, // Data alignment factor.
1490 14, // Return address column.
1491 1, // Augmentation size.
1492 (elfcpp::DW_EH_PE_pcrel
// FDE encoding.
1493 | elfcpp::DW_EH_PE_sdata4
),
1494 elfcpp::DW_CFA_def_cfa
, 15, 0xa0, // DW_CFA_def_cfa: r15 ofs 0xa0.
1499 Output_data_plt_s390
<size
>::plt_eh_frame_fde
[plt_eh_frame_fde_size
] =
1501 0, 0, 0, 0, // Replaced with offset to .plt.
1502 0, 0, 0, 0, // Replaced with size of .plt.
1503 0, // Augmentation size.
1509 // Write out the PLT. This uses the hand-coded instructions above,
1510 // and adjusts them as needed.
1514 Output_data_plt_s390
<size
>::do_write(Output_file
* of
)
1516 const off_t offset
= this->offset();
1517 const section_size_type oview_size
=
1518 convert_to_section_size_type(this->data_size());
1519 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
1521 const off_t got_file_offset
= this->got_plt_
->offset();
1522 gold_assert(parameters
->incremental_update()
1523 || (got_file_offset
+ this->got_plt_
->data_size()
1524 == this->got_irelative_
->offset()));
1525 const section_size_type got_size
=
1526 convert_to_section_size_type(this->got_plt_
->data_size()
1527 + this->got_irelative_
->data_size());
1528 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
1531 unsigned char* pov
= oview
;
1533 // The base address of the .plt section.
1534 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
= this->address();
1535 // The base address of the PLT portion of the .got section,
1536 // which is where the GOT pointer will point, and where the
1537 // three reserved GOT entries are located.
1538 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
1539 = this->got_plt_
->address();
1541 this->fill_first_plt_entry(pov
, got_address
, plt_address
);
1542 pov
+= this->get_plt_entry_size();
1544 unsigned char* got_pov
= got_view
;
1546 const int rel_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
1548 unsigned int plt_offset
= this->get_plt_entry_size();
1549 unsigned int plt_rel_offset
= 0;
1550 unsigned int got_offset
= 3 * size
/ 8;
1551 const unsigned int count
= this->count_
+ this->irelative_count_
;
1552 // The first three entries in the GOT are reserved, and are written
1553 // by Output_data_got_plt_s390::do_write.
1554 got_pov
+= 3 * size
/ 8;
1556 for (unsigned int plt_index
= 0;
1559 pov
+= plt_entry_size
,
1560 got_pov
+= size
/ 8,
1561 plt_offset
+= plt_entry_size
,
1562 plt_rel_offset
+= rel_size
,
1563 got_offset
+= size
/ 8)
1565 // Set and adjust the PLT entry itself.
1566 unsigned int lazy_offset
= this->fill_plt_entry(pov
,
1567 got_address
, plt_address
,
1568 got_offset
, plt_offset
,
1571 // Set the entry in the GOT.
1572 elfcpp::Swap
<size
, true>::writeval(got_pov
,
1573 plt_address
+ plt_offset
+ lazy_offset
);
1576 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
1577 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
1579 of
->write_output_view(offset
, oview_size
, oview
);
1580 of
->write_output_view(got_file_offset
, got_size
, got_view
);
1583 // Get the GOT section, creating it if necessary.
1586 Output_data_got
<size
, true>*
1587 Target_s390
<size
>::got_section(Symbol_table
* symtab
, Layout
* layout
)
1589 if (this->got_
== NULL
)
1591 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
1593 // When using -z now, we can treat .got as a relro section.
1594 // Without -z now, it is modified after program startup by lazy
1596 bool is_got_relro
= parameters
->options().now();
1597 Output_section_order got_order
= (is_got_relro
1601 // The old GNU linker creates a .got.plt section. We just
1602 // create another set of data in the .got section. Note that we
1603 // always create a PLT if we create a GOT, although the PLT
1605 this->got_plt_
= new Output_data_got_plt_s390
<size
>(layout
);
1606 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
1607 (elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
),
1608 this->got_plt_
, got_order
, is_got_relro
);
1610 // The first three entries are reserved.
1611 this->got_plt_
->set_current_data_size(3 * size
/ 8);
1613 // If there are any IRELATIVE relocations, they get GOT entries
1614 // in .got.plt after the jump slot entries.
1615 this->got_irelative_
= new Output_data_space(size
/ 8, "** GOT IRELATIVE PLT");
1616 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
1617 (elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
),
1618 this->got_irelative_
,
1619 got_order
, is_got_relro
);
1621 // Unlike some targets (.e.g x86), S/390 does not use separate .got and
1622 // .got.plt sections in output. The output .got section contains both
1623 // PLT and non-PLT GOT entries.
1624 this->got_
= new Output_data_got
<size
, true>();
1626 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
1627 (elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
),
1628 this->got_
, got_order
, is_got_relro
);
1630 // Define _GLOBAL_OFFSET_TABLE_ at the start of the GOT.
1631 this->global_offset_table_
=
1632 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
1633 Symbol_table::PREDEFINED
,
1635 0, 0, elfcpp::STT_OBJECT
,
1637 elfcpp::STV_HIDDEN
, 0,
1644 // Get the dynamic reloc section, creating it if necessary.
1647 typename Target_s390
<size
>::Reloc_section
*
1648 Target_s390
<size
>::rela_dyn_section(Layout
* layout
)
1650 if (this->rela_dyn_
== NULL
)
1652 gold_assert(layout
!= NULL
);
1653 this->rela_dyn_
= new Reloc_section(parameters
->options().combreloc());
1654 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
1655 elfcpp::SHF_ALLOC
, this->rela_dyn_
,
1656 ORDER_DYNAMIC_RELOCS
, false);
1658 return this->rela_dyn_
;
1661 // Get the section to use for IRELATIVE relocs, creating it if
1662 // necessary. These go in .rela.dyn, but only after all other dynamic
1663 // relocations. They need to follow the other dynamic relocations so
1664 // that they can refer to global variables initialized by those
1668 typename Target_s390
<size
>::Reloc_section
*
1669 Target_s390
<size
>::rela_irelative_section(Layout
* layout
)
1671 if (this->rela_irelative_
== NULL
)
1673 // Make sure we have already created the dynamic reloc section.
1674 this->rela_dyn_section(layout
);
1675 this->rela_irelative_
= new Reloc_section(false);
1676 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
1677 elfcpp::SHF_ALLOC
, this->rela_irelative_
,
1678 ORDER_DYNAMIC_RELOCS
, false);
1679 gold_assert(this->rela_dyn_
->output_section()
1680 == this->rela_irelative_
->output_section());
1682 return this->rela_irelative_
;
1685 // Write the first three reserved words of the .got.plt section.
1686 // The remainder of the section is written while writing the PLT
1687 // in Output_data_plt_s390::do_write.
1691 Output_data_got_plt_s390
<size
>::do_write(Output_file
* of
)
1693 // The first entry in the GOT is the address of the .dynamic section
1694 // aka the PT_DYNAMIC segment. The next two entries are reserved.
1695 // We saved space for them when we created the section in
1696 // Target_x86_64::got_section.
1697 const off_t got_file_offset
= this->offset();
1698 gold_assert(this->data_size() >= 3 * size
/ 8);
1699 unsigned char* const got_view
=
1700 of
->get_output_view(got_file_offset
, 3 * size
/ 8);
1701 Output_section
* dynamic
= this->layout_
->dynamic_section();
1702 uint64_t dynamic_addr
= dynamic
== NULL
? 0 : dynamic
->address();
1703 elfcpp::Swap
<size
, true>::writeval(got_view
, dynamic_addr
);
1704 memset(got_view
+ size
/ 8, 0, 2 * size
/ 8);
1705 of
->write_output_view(got_file_offset
, 3 * size
/ 8, got_view
);
1708 // Create the PLT section.
1712 Target_s390
<size
>::make_plt_section(Symbol_table
* symtab
, Layout
* layout
)
1714 if (this->plt_
== NULL
)
1716 // Create the GOT sections first.
1717 this->got_section(symtab
, layout
);
1719 // Ensure that .rela.dyn always appears before .rela.plt This is
1720 // necessary due to how, on 32-bit S/390 and some other targets,
1721 // .rela.dyn needs to include .rela.plt in it's range.
1722 this->rela_dyn_section(layout
);
1724 this->plt_
= new Output_data_plt_s390
<size
>(layout
,
1725 this->got_
, this->got_plt_
, this->got_irelative_
);
1727 // Add unwind information if requested.
1728 if (parameters
->options().ld_generated_unwind_info())
1729 this->plt_
->add_eh_frame(layout
);
1731 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
1733 | elfcpp::SHF_EXECINSTR
),
1734 this->plt_
, ORDER_PLT
, false);
1736 // Make the sh_info field of .rela.plt point to .plt.
1737 Output_section
* rela_plt_os
= this->plt_
->rela_plt()->output_section();
1738 rela_plt_os
->set_info_section(this->plt_
->output_section());
1742 // Create a PLT entry for a global symbol.
1746 Target_s390
<size
>::make_plt_entry(Symbol_table
* symtab
, Layout
* layout
,
1749 if (gsym
->has_plt_offset())
1752 if (this->plt_
== NULL
)
1753 this->make_plt_section(symtab
, layout
);
1755 this->plt_
->add_entry(symtab
, layout
, gsym
);
1758 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
1762 Target_s390
<size
>::make_local_ifunc_plt_entry(
1763 Symbol_table
* symtab
, Layout
* layout
,
1764 Sized_relobj_file
<size
, true>* relobj
,
1765 unsigned int local_sym_index
)
1767 if (relobj
->local_has_plt_offset(local_sym_index
))
1769 if (this->plt_
== NULL
)
1770 this->make_plt_section(symtab
, layout
);
1771 unsigned int plt_offset
= this->plt_
->add_local_ifunc_entry(symtab
, layout
,
1774 relobj
->set_local_plt_offset(local_sym_index
, plt_offset
);
1777 // Return the number of entries in the PLT.
1781 Target_s390
<size
>::plt_entry_count() const
1783 if (this->plt_
== NULL
)
1785 return this->plt_
->entry_count();
1788 // Return the offset of the first non-reserved PLT entry.
1792 Target_s390
<size
>::first_plt_entry_offset() const
1794 return this->plt_
->first_plt_entry_offset();
1797 // Return the size of each PLT entry.
1801 Target_s390
<size
>::plt_entry_size() const
1803 return this->plt_
->get_plt_entry_size();
1806 // Create the GOT and PLT sections for an incremental update.
1809 Output_data_got_base
*
1810 Target_s390
<size
>::init_got_plt_for_update(Symbol_table
* symtab
,
1812 unsigned int got_count
,
1813 unsigned int plt_count
)
1815 gold_assert(this->got_
== NULL
);
1817 // Add the three reserved entries.
1818 this->got_plt_
= new Output_data_got_plt_s390
<size
>(layout
, (plt_count
+ 3) * size
/ 8);
1819 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
1821 | elfcpp::SHF_WRITE
),
1822 this->got_plt_
, ORDER_NON_RELRO_FIRST
,
1825 // If there are any IRELATIVE relocations, they get GOT entries in
1826 // .got.plt after the jump slot entries.
1827 this->got_irelative_
= new Output_data_space(0, size
/ 8, "** GOT IRELATIVE PLT");
1828 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
1829 elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
,
1830 this->got_irelative_
,
1831 ORDER_NON_RELRO_FIRST
, false);
1833 this->got_
= new Output_data_got
<size
, true>(got_count
* size
/ 8);
1834 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
1836 | elfcpp::SHF_WRITE
),
1837 this->got_
, ORDER_RELRO_LAST
,
1840 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
1841 this->global_offset_table_
=
1842 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
1843 Symbol_table::PREDEFINED
,
1845 0, 0, elfcpp::STT_OBJECT
,
1847 elfcpp::STV_HIDDEN
, 0,
1850 // Create the PLT section.
1851 this->plt_
= new Output_data_plt_s390
<size
>(layout
,
1852 this->got_
, this->got_plt_
, this->got_irelative_
, plt_count
);
1854 // Add unwind information if requested.
1855 if (parameters
->options().ld_generated_unwind_info())
1856 this->plt_
->add_eh_frame(layout
);
1858 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
1859 elfcpp::SHF_ALLOC
| elfcpp::SHF_EXECINSTR
,
1860 this->plt_
, ORDER_PLT
, false);
1862 // Make the sh_info field of .rela.plt point to .plt.
1863 Output_section
* rela_plt_os
= this->plt_
->rela_plt()->output_section();
1864 rela_plt_os
->set_info_section(this->plt_
->output_section());
1866 // Create the rela_dyn section.
1867 this->rela_dyn_section(layout
);
1872 // Reserve a GOT entry for a local symbol, and regenerate any
1873 // necessary dynamic relocations.
1877 Target_s390
<size
>::reserve_local_got_entry(
1878 unsigned int got_index
,
1879 Sized_relobj
<size
, true>* obj
,
1881 unsigned int got_type
)
1883 unsigned int got_offset
= got_index
* size
/ 8;
1884 Reloc_section
* rela_dyn
= this->rela_dyn_section(NULL
);
1886 this->got_
->reserve_local(got_index
, obj
, r_sym
, got_type
);
1889 case GOT_TYPE_STANDARD
:
1890 if (parameters
->options().output_is_position_independent())
1891 rela_dyn
->add_local_relative(obj
, r_sym
, elfcpp::R_390_RELATIVE
,
1892 this->got_
, got_offset
, 0, false);
1894 case GOT_TYPE_TLS_OFFSET
:
1895 rela_dyn
->add_local(obj
, r_sym
, elfcpp::R_390_TLS_TPOFF
,
1896 this->got_
, got_offset
, 0);
1898 case GOT_TYPE_TLS_PAIR
:
1899 this->got_
->reserve_slot(got_index
+ 1);
1900 rela_dyn
->add_local(obj
, r_sym
, elfcpp::R_390_TLS_DTPMOD
,
1901 this->got_
, got_offset
, 0);
1908 // Reserve a GOT entry for a global symbol, and regenerate any
1909 // necessary dynamic relocations.
1913 Target_s390
<size
>::reserve_global_got_entry(unsigned int got_index
,
1915 unsigned int got_type
)
1917 unsigned int got_offset
= got_index
* size
/ 8;
1918 Reloc_section
* rela_dyn
= this->rela_dyn_section(NULL
);
1920 this->got_
->reserve_global(got_index
, gsym
, got_type
);
1923 case GOT_TYPE_STANDARD
:
1924 if (!gsym
->final_value_is_known())
1926 if (gsym
->is_from_dynobj()
1927 || gsym
->is_undefined()
1928 || gsym
->is_preemptible()
1929 || gsym
->type() == elfcpp::STT_GNU_IFUNC
)
1930 rela_dyn
->add_global(gsym
, elfcpp::R_390_GLOB_DAT
,
1931 this->got_
, got_offset
, 0);
1933 rela_dyn
->add_global_relative(gsym
, elfcpp::R_390_RELATIVE
,
1934 this->got_
, got_offset
, 0, false);
1937 case GOT_TYPE_TLS_OFFSET
:
1938 rela_dyn
->add_global_relative(gsym
, elfcpp::R_390_TLS_TPOFF
,
1939 this->got_
, got_offset
, 0, false);
1941 case GOT_TYPE_TLS_PAIR
:
1942 this->got_
->reserve_slot(got_index
+ 1);
1943 rela_dyn
->add_global_relative(gsym
, elfcpp::R_390_TLS_DTPMOD
,
1944 this->got_
, got_offset
, 0, false);
1945 rela_dyn
->add_global_relative(gsym
, elfcpp::R_390_TLS_DTPOFF
,
1946 this->got_
, got_offset
+ size
/ 8, 0, false);
1953 // Register an existing PLT entry for a global symbol.
1957 Target_s390
<size
>::register_global_plt_entry(Symbol_table
* symtab
,
1959 unsigned int plt_index
,
1962 gold_assert(this->plt_
!= NULL
);
1963 gold_assert(!gsym
->has_plt_offset());
1965 this->plt_
->reserve_slot(plt_index
);
1967 gsym
->set_plt_offset((plt_index
+ 1) * this->plt_entry_size());
1969 unsigned int got_offset
= (plt_index
+ 3) * size
/ 8;
1970 this->plt_
->add_relocation(symtab
, layout
, gsym
, got_offset
);
1973 // Force a COPY relocation for a given symbol.
1977 Target_s390
<size
>::emit_copy_reloc(
1978 Symbol_table
* symtab
, Symbol
* sym
, Output_section
* os
, off_t offset
)
1980 this->copy_relocs_
.emit_copy_reloc(symtab
,
1981 symtab
->get_sized_symbol
<size
>(sym
),
1984 this->rela_dyn_section(NULL
));
1987 // Create a GOT entry for the TLS module index.
1991 Target_s390
<size
>::got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
1992 Sized_relobj_file
<size
, true>* object
)
1994 if (this->got_mod_index_offset_
== -1U)
1996 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
1997 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
1998 Output_data_got
<size
, true>* got
= this->got_section(symtab
, layout
);
1999 unsigned int got_offset
= got
->add_constant(0);
2000 rela_dyn
->add_local(object
, 0, elfcpp::R_390_TLS_DTPMOD
, got
,
2002 got
->add_constant(0);
2003 this->got_mod_index_offset_
= got_offset
;
2005 return this->got_mod_index_offset_
;
2008 // Optimize the TLS relocation type based on what we know about the
2009 // symbol. IS_FINAL is true if the final address of this symbol is
2010 // known at link time.
2013 tls::Tls_optimization
2014 Target_s390
<size
>::optimize_tls_reloc(bool is_final
, int r_type
)
2016 // If we are generating a shared library, then we can't do anything
2018 if (parameters
->options().shared())
2019 return tls::TLSOPT_NONE
;
2023 case elfcpp::R_390_TLS_GD32
:
2024 case elfcpp::R_390_TLS_GD64
:
2025 case elfcpp::R_390_TLS_GDCALL
:
2026 // These are General-Dynamic which permits fully general TLS
2027 // access. Since we know that we are generating an executable,
2028 // we can convert this to Initial-Exec. If we also know that
2029 // this is a local symbol, we can further switch to Local-Exec.
2031 return tls::TLSOPT_TO_LE
;
2032 return tls::TLSOPT_TO_IE
;
2034 case elfcpp::R_390_TLS_LDM32
:
2035 case elfcpp::R_390_TLS_LDM64
:
2036 case elfcpp::R_390_TLS_LDO32
:
2037 case elfcpp::R_390_TLS_LDO64
:
2038 case elfcpp::R_390_TLS_LDCALL
:
2039 // This is Local-Dynamic, which refers to a local symbol in the
2040 // dynamic TLS block. Since we know that we generating an
2041 // executable, we can switch to Local-Exec.
2042 return tls::TLSOPT_TO_LE
;
2044 case elfcpp::R_390_TLS_IE32
:
2045 case elfcpp::R_390_TLS_IE64
:
2046 case elfcpp::R_390_TLS_GOTIE32
:
2047 case elfcpp::R_390_TLS_GOTIE64
:
2048 case elfcpp::R_390_TLS_LOAD
:
2049 // These are Initial-Exec relocs which get the thread offset
2050 // from the GOT. If we know that we are linking against the
2051 // local symbol, we can switch to Local-Exec, which links the
2052 // thread offset into the instruction.
2054 return tls::TLSOPT_TO_LE
;
2055 return tls::TLSOPT_NONE
;
2057 case elfcpp::R_390_TLS_GOTIE12
:
2058 case elfcpp::R_390_TLS_IEENT
:
2059 case elfcpp::R_390_TLS_GOTIE20
:
2060 // These are Initial-Exec, but cannot be optimized.
2061 return tls::TLSOPT_NONE
;
2063 case elfcpp::R_390_TLS_LE32
:
2064 case elfcpp::R_390_TLS_LE64
:
2065 // When we already have Local-Exec, there is nothing further we
2067 return tls::TLSOPT_NONE
;
2074 // Get the Reference_flags for a particular relocation.
2078 Target_s390
<size
>::Scan::get_reference_flags(unsigned int r_type
)
2082 case elfcpp::R_390_NONE
:
2083 case elfcpp::R_390_GNU_VTINHERIT
:
2084 case elfcpp::R_390_GNU_VTENTRY
:
2085 case elfcpp::R_390_GOTPC
:
2086 case elfcpp::R_390_GOTPCDBL
:
2087 // No symbol reference.
2090 case elfcpp::R_390_64
:
2091 case elfcpp::R_390_32
:
2092 case elfcpp::R_390_20
:
2093 case elfcpp::R_390_16
:
2094 case elfcpp::R_390_12
:
2095 case elfcpp::R_390_8
:
2096 return Symbol::ABSOLUTE_REF
;
2098 case elfcpp::R_390_PC12DBL
:
2099 case elfcpp::R_390_PC16
:
2100 case elfcpp::R_390_PC16DBL
:
2101 case elfcpp::R_390_PC24DBL
:
2102 case elfcpp::R_390_PC32
:
2103 case elfcpp::R_390_PC32DBL
:
2104 case elfcpp::R_390_PC64
:
2105 case elfcpp::R_390_GOTOFF16
:
2106 case elfcpp::R_390_GOTOFF32
:
2107 case elfcpp::R_390_GOTOFF64
:
2108 return Symbol::RELATIVE_REF
;
2110 case elfcpp::R_390_PLT12DBL
:
2111 case elfcpp::R_390_PLT16DBL
:
2112 case elfcpp::R_390_PLT24DBL
:
2113 case elfcpp::R_390_PLT32
:
2114 case elfcpp::R_390_PLT32DBL
:
2115 case elfcpp::R_390_PLT64
:
2116 case elfcpp::R_390_PLTOFF16
:
2117 case elfcpp::R_390_PLTOFF32
:
2118 case elfcpp::R_390_PLTOFF64
:
2119 return Symbol::FUNCTION_CALL
| Symbol::RELATIVE_REF
;
2121 case elfcpp::R_390_GOT12
:
2122 case elfcpp::R_390_GOT16
:
2123 case elfcpp::R_390_GOT20
:
2124 case elfcpp::R_390_GOT32
:
2125 case elfcpp::R_390_GOT64
:
2126 case elfcpp::R_390_GOTENT
:
2127 case elfcpp::R_390_GOTPLT12
:
2128 case elfcpp::R_390_GOTPLT16
:
2129 case elfcpp::R_390_GOTPLT20
:
2130 case elfcpp::R_390_GOTPLT32
:
2131 case elfcpp::R_390_GOTPLT64
:
2132 case elfcpp::R_390_GOTPLTENT
:
2134 return Symbol::ABSOLUTE_REF
;
2136 case elfcpp::R_390_TLS_GD32
: // Global-dynamic
2137 case elfcpp::R_390_TLS_GD64
:
2138 case elfcpp::R_390_TLS_GDCALL
:
2139 case elfcpp::R_390_TLS_LDM32
: // Local-dynamic
2140 case elfcpp::R_390_TLS_LDM64
:
2141 case elfcpp::R_390_TLS_LDO32
:
2142 case elfcpp::R_390_TLS_LDO64
:
2143 case elfcpp::R_390_TLS_LDCALL
:
2144 case elfcpp::R_390_TLS_IE32
: // Initial-exec
2145 case elfcpp::R_390_TLS_IE64
:
2146 case elfcpp::R_390_TLS_IEENT
:
2147 case elfcpp::R_390_TLS_GOTIE12
:
2148 case elfcpp::R_390_TLS_GOTIE20
:
2149 case elfcpp::R_390_TLS_GOTIE32
:
2150 case elfcpp::R_390_TLS_GOTIE64
:
2151 case elfcpp::R_390_TLS_LOAD
:
2152 case elfcpp::R_390_TLS_LE32
: // Local-exec
2153 case elfcpp::R_390_TLS_LE64
:
2154 return Symbol::TLS_REF
;
2156 case elfcpp::R_390_COPY
:
2157 case elfcpp::R_390_GLOB_DAT
:
2158 case elfcpp::R_390_JMP_SLOT
:
2159 case elfcpp::R_390_RELATIVE
:
2160 case elfcpp::R_390_IRELATIVE
:
2161 case elfcpp::R_390_TLS_TPOFF
:
2162 case elfcpp::R_390_TLS_DTPOFF
:
2163 case elfcpp::R_390_TLS_DTPMOD
:
2165 // Not expected. We will give an error later.
2170 // Report an unsupported relocation against a local symbol.
2174 Target_s390
<size
>::Scan::unsupported_reloc_local(
2175 Sized_relobj_file
<size
, true>* object
,
2176 unsigned int r_type
)
2178 gold_error(_("%s: unsupported reloc %u against local symbol"),
2179 object
->name().c_str(), r_type
);
2182 // We are about to emit a dynamic relocation of type R_TYPE. If the
2183 // dynamic linker does not support it, issue an error.
2187 Target_s390
<size
>::Scan::check_non_pic(Relobj
* object
, unsigned int r_type
)
2189 gold_assert(r_type
!= elfcpp::R_390_NONE
);
2195 // These are the relocation types supported by glibc for s390 64-bit.
2196 case elfcpp::R_390_RELATIVE
:
2197 case elfcpp::R_390_IRELATIVE
:
2198 case elfcpp::R_390_COPY
:
2199 case elfcpp::R_390_GLOB_DAT
:
2200 case elfcpp::R_390_JMP_SLOT
:
2201 case elfcpp::R_390_TLS_DTPMOD
:
2202 case elfcpp::R_390_TLS_DTPOFF
:
2203 case elfcpp::R_390_TLS_TPOFF
:
2204 case elfcpp::R_390_8
:
2205 case elfcpp::R_390_16
:
2206 case elfcpp::R_390_32
:
2207 case elfcpp::R_390_64
:
2208 case elfcpp::R_390_PC16
:
2209 case elfcpp::R_390_PC16DBL
:
2210 case elfcpp::R_390_PC32
:
2211 case elfcpp::R_390_PC32DBL
:
2212 case elfcpp::R_390_PC64
:
2223 // These are the relocation types supported by glibc for s390 32-bit.
2224 case elfcpp::R_390_RELATIVE
:
2225 case elfcpp::R_390_IRELATIVE
:
2226 case elfcpp::R_390_COPY
:
2227 case elfcpp::R_390_GLOB_DAT
:
2228 case elfcpp::R_390_JMP_SLOT
:
2229 case elfcpp::R_390_TLS_DTPMOD
:
2230 case elfcpp::R_390_TLS_DTPOFF
:
2231 case elfcpp::R_390_TLS_TPOFF
:
2232 case elfcpp::R_390_8
:
2233 case elfcpp::R_390_16
:
2234 case elfcpp::R_390_32
:
2235 case elfcpp::R_390_PC16
:
2236 case elfcpp::R_390_PC16DBL
:
2237 case elfcpp::R_390_PC32
:
2238 case elfcpp::R_390_PC32DBL
:
2246 // This prevents us from issuing more than one error per reloc
2247 // section. But we can still wind up issuing more than one
2248 // error per object file.
2249 if (this->issued_non_pic_error_
)
2251 gold_assert(parameters
->options().output_is_position_independent());
2252 object
->error(_("requires unsupported dynamic reloc; "
2253 "recompile with -fPIC"));
2254 this->issued_non_pic_error_
= true;
2258 // Return whether we need to make a PLT entry for a relocation of the
2259 // given type against a STT_GNU_IFUNC symbol.
2263 Target_s390
<size
>::Scan::reloc_needs_plt_for_ifunc(
2264 Sized_relobj_file
<size
, true>* object
,
2265 unsigned int r_type
)
2267 int flags
= Scan::get_reference_flags(r_type
);
2268 if (flags
& Symbol::TLS_REF
)
2269 gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"),
2270 object
->name().c_str(), r_type
);
2274 // Scan a relocation for a local symbol.
2278 Target_s390
<size
>::Scan::local(Symbol_table
* symtab
,
2280 Target_s390
<size
>* target
,
2281 Sized_relobj_file
<size
, true>* object
,
2282 unsigned int data_shndx
,
2283 Output_section
* output_section
,
2284 const elfcpp::Rela
<size
, true>& reloc
,
2285 unsigned int r_type
,
2286 const elfcpp::Sym
<size
, true>& lsym
,
2292 // A local STT_GNU_IFUNC symbol may require a PLT entry.
2293 bool is_ifunc
= lsym
.get_st_type() == elfcpp::STT_GNU_IFUNC
;
2295 if (is_ifunc
&& this->reloc_needs_plt_for_ifunc(object
, r_type
))
2297 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2298 target
->make_local_ifunc_plt_entry(symtab
, layout
, object
, r_sym
);
2303 case elfcpp::R_390_NONE
:
2304 case elfcpp::R_390_GNU_VTINHERIT
:
2305 case elfcpp::R_390_GNU_VTENTRY
:
2308 case elfcpp::R_390_64
:
2309 // If building a shared library (or a position-independent
2310 // executable), we need to create a dynamic relocation for this
2311 // location. The relocation applied at link time will apply the
2312 // link-time value, so we flag the location with an
2313 // R_390_RELATIVE relocation so the dynamic loader can
2314 // relocate it easily.
2315 if (parameters
->options().output_is_position_independent() && size
== 64)
2317 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2318 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2319 rela_dyn
->add_local_relative(object
, r_sym
,
2320 elfcpp::R_390_RELATIVE
,
2321 output_section
, data_shndx
,
2322 reloc
.get_r_offset(),
2323 reloc
.get_r_addend(), is_ifunc
);
2327 case elfcpp::R_390_32
:
2328 case elfcpp::R_390_20
:
2329 case elfcpp::R_390_16
:
2330 case elfcpp::R_390_12
:
2331 case elfcpp::R_390_8
:
2332 if (parameters
->options().output_is_position_independent())
2334 if (size
== 32 && r_type
== elfcpp::R_390_32
)
2336 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2337 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2338 rela_dyn
->add_local_relative(object
, r_sym
,
2339 elfcpp::R_390_RELATIVE
,
2340 output_section
, data_shndx
,
2341 reloc
.get_r_offset(),
2342 reloc
.get_r_addend(), is_ifunc
);
2346 check_non_pic(object
, r_type
);
2348 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2349 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2350 if (lsym
.get_st_type() != elfcpp::STT_SECTION
)
2351 rela_dyn
->add_local(object
, r_sym
, r_type
, output_section
,
2352 data_shndx
, reloc
.get_r_offset(),
2353 reloc
.get_r_addend());
2356 gold_assert(lsym
.get_st_value() == 0);
2357 unsigned int shndx
= lsym
.get_st_shndx();
2359 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
,
2362 object
->error(_("section symbol %u has bad shndx %u"),
2365 rela_dyn
->add_local_section(object
, shndx
,
2366 r_type
, output_section
,
2367 data_shndx
, reloc
.get_r_offset(),
2368 reloc
.get_r_addend());
2373 case elfcpp::R_390_PC12DBL
:
2374 case elfcpp::R_390_PC16
:
2375 case elfcpp::R_390_PC16DBL
:
2376 case elfcpp::R_390_PC24DBL
:
2377 case elfcpp::R_390_PC32
:
2378 case elfcpp::R_390_PC32DBL
:
2379 case elfcpp::R_390_PC64
:
2382 case elfcpp::R_390_PLT12DBL
:
2383 case elfcpp::R_390_PLT16DBL
:
2384 case elfcpp::R_390_PLT24DBL
:
2385 case elfcpp::R_390_PLT32
:
2386 case elfcpp::R_390_PLT32DBL
:
2387 case elfcpp::R_390_PLT64
:
2388 // Since we know this is a local symbol, we can handle this as a
2392 case elfcpp::R_390_GOTPC
:
2393 case elfcpp::R_390_GOTPCDBL
:
2394 case elfcpp::R_390_GOTOFF16
:
2395 case elfcpp::R_390_GOTOFF32
:
2396 case elfcpp::R_390_GOTOFF64
:
2397 case elfcpp::R_390_PLTOFF16
:
2398 case elfcpp::R_390_PLTOFF32
:
2399 case elfcpp::R_390_PLTOFF64
:
2400 // We need a GOT section.
2401 target
->got_section(symtab
, layout
);
2402 // For PLTOFF*, we'd normally want a PLT section, but since we
2403 // know this is a local symbol, no PLT is needed.
2406 case elfcpp::R_390_GOT12
:
2407 case elfcpp::R_390_GOT16
:
2408 case elfcpp::R_390_GOT20
:
2409 case elfcpp::R_390_GOT32
:
2410 case elfcpp::R_390_GOT64
:
2411 case elfcpp::R_390_GOTENT
:
2412 case elfcpp::R_390_GOTPLT12
:
2413 case elfcpp::R_390_GOTPLT16
:
2414 case elfcpp::R_390_GOTPLT20
:
2415 case elfcpp::R_390_GOTPLT32
:
2416 case elfcpp::R_390_GOTPLT64
:
2417 case elfcpp::R_390_GOTPLTENT
:
2419 // The symbol requires a GOT section.
2420 Output_data_got
<size
, true>* got
= target
->got_section(symtab
, layout
);
2422 // The symbol requires a GOT entry.
2423 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2425 // For a STT_GNU_IFUNC symbol we want the PLT offset. That
2426 // lets function pointers compare correctly with shared
2427 // libraries. Otherwise we would need an IRELATIVE reloc.
2430 is_new
= got
->add_local_plt(object
, r_sym
, GOT_TYPE_STANDARD
);
2432 is_new
= got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
);
2435 // If we are generating a shared object, we need to add a
2436 // dynamic relocation for this symbol's GOT entry.
2437 if (parameters
->options().output_is_position_independent())
2439 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2440 unsigned int got_offset
=
2441 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
);
2442 rela_dyn
->add_local_relative(object
, r_sym
,
2443 elfcpp::R_390_RELATIVE
,
2444 got
, got_offset
, 0, is_ifunc
);
2447 // For GOTPLT*, we'd normally want a PLT section, but since
2448 // we know this is a local symbol, no PLT is needed.
2452 case elfcpp::R_390_COPY
:
2453 case elfcpp::R_390_GLOB_DAT
:
2454 case elfcpp::R_390_JMP_SLOT
:
2455 case elfcpp::R_390_RELATIVE
:
2456 case elfcpp::R_390_IRELATIVE
:
2457 // These are outstanding tls relocs, which are unexpected when linking
2458 case elfcpp::R_390_TLS_TPOFF
:
2459 case elfcpp::R_390_TLS_DTPOFF
:
2460 case elfcpp::R_390_TLS_DTPMOD
:
2461 gold_error(_("%s: unexpected reloc %u in object file"),
2462 object
->name().c_str(), r_type
);
2465 // These are initial tls relocs, which are expected when linking
2466 case elfcpp::R_390_TLS_GD32
: // Global-dynamic
2467 case elfcpp::R_390_TLS_GD64
:
2468 case elfcpp::R_390_TLS_GDCALL
:
2469 case elfcpp::R_390_TLS_LDM32
: // Local-dynamic
2470 case elfcpp::R_390_TLS_LDM64
:
2471 case elfcpp::R_390_TLS_LDO32
:
2472 case elfcpp::R_390_TLS_LDO64
:
2473 case elfcpp::R_390_TLS_LDCALL
:
2474 case elfcpp::R_390_TLS_IE32
: // Initial-exec
2475 case elfcpp::R_390_TLS_IE64
:
2476 case elfcpp::R_390_TLS_IEENT
:
2477 case elfcpp::R_390_TLS_GOTIE12
:
2478 case elfcpp::R_390_TLS_GOTIE20
:
2479 case elfcpp::R_390_TLS_GOTIE32
:
2480 case elfcpp::R_390_TLS_GOTIE64
:
2481 case elfcpp::R_390_TLS_LOAD
:
2482 case elfcpp::R_390_TLS_LE32
: // Local-exec
2483 case elfcpp::R_390_TLS_LE64
:
2485 bool output_is_shared
= parameters
->options().shared();
2486 const tls::Tls_optimization optimized_type
2487 = Target_s390
<size
>::optimize_tls_reloc(!output_is_shared
,
2491 case elfcpp::R_390_TLS_GD32
: // General-dynamic
2492 case elfcpp::R_390_TLS_GD64
:
2493 case elfcpp::R_390_TLS_GDCALL
:
2494 if (optimized_type
== tls::TLSOPT_NONE
)
2496 // Create a pair of GOT entries for the module index and
2497 // dtv-relative offset.
2498 Output_data_got
<size
, true>* got
2499 = target
->got_section(symtab
, layout
);
2500 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2501 unsigned int shndx
= lsym
.get_st_shndx();
2503 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
2505 object
->error(_("local symbol %u has bad shndx %u"),
2508 got
->add_local_pair_with_rel(object
, r_sym
,
2511 target
->rela_dyn_section(layout
),
2512 elfcpp::R_390_TLS_DTPMOD
);
2514 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
2515 unsupported_reloc_local(object
, r_type
);
2518 case elfcpp::R_390_TLS_LDM32
: // Local-dynamic
2519 case elfcpp::R_390_TLS_LDM64
:
2520 case elfcpp::R_390_TLS_LDCALL
:
2521 if (optimized_type
== tls::TLSOPT_NONE
)
2523 // Create a GOT entry for the module index.
2524 target
->got_mod_index_entry(symtab
, layout
, object
);
2526 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
2527 unsupported_reloc_local(object
, r_type
);
2530 case elfcpp::R_390_TLS_LDO32
:
2531 case elfcpp::R_390_TLS_LDO64
:
2534 case elfcpp::R_390_TLS_IE32
: // Initial-exec
2535 case elfcpp::R_390_TLS_IE64
:
2536 // These two involve an absolute address
2537 if (parameters
->options().shared()
2538 && optimized_type
== tls::TLSOPT_NONE
)
2540 if ((size
== 32 && r_type
== elfcpp::R_390_TLS_IE32
) ||
2541 (size
== 64 && r_type
== elfcpp::R_390_TLS_IE64
))
2543 // We need to create a dynamic relocation.
2544 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2545 unsigned int r_sym
=
2546 elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2547 rela_dyn
->add_local_relative(object
, r_sym
,
2548 elfcpp::R_390_RELATIVE
,
2549 output_section
, data_shndx
,
2550 reloc
.get_r_offset(),
2551 reloc
.get_r_addend(), false);
2555 unsupported_reloc_local(object
, r_type
);
2559 case elfcpp::R_390_TLS_IEENT
:
2560 case elfcpp::R_390_TLS_GOTIE12
:
2561 case elfcpp::R_390_TLS_GOTIE20
:
2562 case elfcpp::R_390_TLS_GOTIE32
:
2563 case elfcpp::R_390_TLS_GOTIE64
:
2564 case elfcpp::R_390_TLS_LOAD
:
2565 layout
->set_has_static_tls();
2566 if (optimized_type
== tls::TLSOPT_NONE
)
2568 if (!output_is_shared
)
2570 // We're making an executable, and the symbol is local, but
2571 // we cannot optimize to LE. Make a const GOT entry instead.
2572 Output_data_got
<size
, true>* got
2573 = target
->got_section(symtab
, layout
);
2575 = elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2576 got
->add_local_plt(object
, r_sym
, GOT_TYPE_TLS_OFFSET
);
2580 // Create a GOT entry for the tp-relative offset.
2581 Output_data_got
<size
, true>* got
2582 = target
->got_section(symtab
, layout
);
2584 = elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2585 got
->add_local_with_rel(object
, r_sym
, GOT_TYPE_TLS_OFFSET
,
2586 target
->rela_dyn_section(layout
),
2587 elfcpp::R_390_TLS_TPOFF
);
2590 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
2591 unsupported_reloc_local(object
, r_type
);
2594 case elfcpp::R_390_TLS_LE32
: // Local-exec
2595 case elfcpp::R_390_TLS_LE64
:
2596 layout
->set_has_static_tls();
2597 if (output_is_shared
)
2599 // We need to create a dynamic relocation.
2600 if ((size
== 32 && r_type
== elfcpp::R_390_TLS_LE32
) ||
2601 (size
== 64 && r_type
== elfcpp::R_390_TLS_LE64
))
2603 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2605 = elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2606 gold_assert(lsym
.get_st_type() != elfcpp::STT_SECTION
);
2607 rela_dyn
->add_local(object
, r_sym
, elfcpp::R_390_TLS_TPOFF
,
2608 output_section
, data_shndx
,
2609 reloc
.get_r_offset(),
2610 reloc
.get_r_addend());
2614 unsupported_reloc_local(object
, r_type
);
2626 gold_error(_("%s: unsupported reloc %u against local symbol"),
2627 object
->name().c_str(), r_type
);
2632 // Scan a relocation for a global symbol.
2636 Target_s390
<size
>::Scan::global(Symbol_table
* symtab
,
2638 Target_s390
<size
>* target
,
2639 Sized_relobj_file
<size
, true>* object
,
2640 unsigned int data_shndx
,
2641 Output_section
* output_section
,
2642 const elfcpp::Rela
<size
, true>& reloc
,
2643 unsigned int r_type
,
2646 // A STT_GNU_IFUNC symbol may require a PLT entry.
2647 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
2648 && this->reloc_needs_plt_for_ifunc(object
, r_type
))
2649 target
->make_plt_entry(symtab
, layout
, gsym
);
2653 case elfcpp::R_390_NONE
:
2654 case elfcpp::R_390_GNU_VTINHERIT
:
2655 case elfcpp::R_390_GNU_VTENTRY
:
2658 case elfcpp::R_390_64
:
2659 case elfcpp::R_390_32
:
2660 case elfcpp::R_390_20
:
2661 case elfcpp::R_390_16
:
2662 case elfcpp::R_390_12
:
2663 case elfcpp::R_390_8
:
2665 // Make a PLT entry if necessary.
2666 if (gsym
->needs_plt_entry())
2668 target
->make_plt_entry(symtab
, layout
, gsym
);
2669 // Since this is not a PC-relative relocation, we may be
2670 // taking the address of a function. In that case we need to
2671 // set the entry in the dynamic symbol table to the address of
2673 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
2674 gsym
->set_needs_dynsym_value();
2676 // Make a dynamic relocation if necessary.
2677 if (gsym
->needs_dynamic_reloc(Scan::get_reference_flags(r_type
)))
2679 if (!parameters
->options().output_is_position_independent()
2680 && gsym
->may_need_copy_reloc())
2682 target
->copy_reloc(symtab
, layout
, object
,
2683 data_shndx
, output_section
, gsym
, reloc
);
2685 else if (((size
== 64 && r_type
== elfcpp::R_390_64
)
2686 || (size
== 32 && r_type
== elfcpp::R_390_32
))
2687 && gsym
->type() == elfcpp::STT_GNU_IFUNC
2688 && gsym
->can_use_relative_reloc(false)
2689 && !gsym
->is_from_dynobj()
2690 && !gsym
->is_undefined()
2691 && !gsym
->is_preemptible())
2693 // Use an IRELATIVE reloc for a locally defined
2694 // STT_GNU_IFUNC symbol. This makes a function
2695 // address in a PIE executable match the address in a
2696 // shared library that it links against.
2697 Reloc_section
* rela_dyn
=
2698 target
->rela_irelative_section(layout
);
2699 unsigned int r_type
= elfcpp::R_390_IRELATIVE
;
2700 rela_dyn
->add_symbolless_global_addend(gsym
, r_type
,
2701 output_section
, object
,
2703 reloc
.get_r_offset(),
2704 reloc
.get_r_addend());
2706 else if (((size
== 64 && r_type
== elfcpp::R_390_64
)
2707 || (size
== 32 && r_type
== elfcpp::R_390_32
))
2708 && gsym
->can_use_relative_reloc(false))
2710 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2711 rela_dyn
->add_global_relative(gsym
, elfcpp::R_390_RELATIVE
,
2712 output_section
, object
,
2714 reloc
.get_r_offset(),
2715 reloc
.get_r_addend(), false);
2719 check_non_pic(object
, r_type
);
2720 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2721 rela_dyn
->add_global(gsym
, r_type
, output_section
, object
,
2722 data_shndx
, reloc
.get_r_offset(),
2723 reloc
.get_r_addend());
2729 case elfcpp::R_390_PC12DBL
:
2730 case elfcpp::R_390_PC16
:
2731 case elfcpp::R_390_PC16DBL
:
2732 case elfcpp::R_390_PC24DBL
:
2733 case elfcpp::R_390_PC32
:
2734 case elfcpp::R_390_PC32DBL
:
2735 case elfcpp::R_390_PC64
:
2737 // Make a PLT entry if necessary.
2738 if (gsym
->needs_plt_entry())
2740 target
->make_plt_entry(symtab
, layout
, gsym
);
2741 // larl is often used to take address of a function. Aim the
2742 // symbol at the PLT entry.
2743 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
2744 gsym
->set_needs_dynsym_value();
2746 // Make a dynamic relocation if necessary.
2747 if (gsym
->needs_dynamic_reloc(Scan::get_reference_flags(r_type
)))
2749 if (parameters
->options().output_is_executable()
2750 && gsym
->may_need_copy_reloc())
2752 target
->copy_reloc(symtab
, layout
, object
,
2753 data_shndx
, output_section
, gsym
, reloc
);
2757 check_non_pic(object
, r_type
);
2758 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2759 rela_dyn
->add_global(gsym
, r_type
, output_section
, object
,
2760 data_shndx
, reloc
.get_r_offset(),
2761 reloc
.get_r_addend());
2767 case elfcpp::R_390_PLT12DBL
:
2768 case elfcpp::R_390_PLT16DBL
:
2769 case elfcpp::R_390_PLT24DBL
:
2770 case elfcpp::R_390_PLT32
:
2771 case elfcpp::R_390_PLT32DBL
:
2772 case elfcpp::R_390_PLT64
:
2773 // If the symbol is fully resolved, this is just a PC32 reloc.
2774 // Otherwise we need a PLT entry.
2775 if (gsym
->final_value_is_known())
2777 // If building a shared library, we can also skip the PLT entry
2778 // if the symbol is defined in the output file and is protected
2780 if (gsym
->is_defined()
2781 && !gsym
->is_from_dynobj()
2782 && !gsym
->is_preemptible())
2784 target
->make_plt_entry(symtab
, layout
, gsym
);
2787 case elfcpp::R_390_GOTPC
:
2788 case elfcpp::R_390_GOTPCDBL
:
2789 case elfcpp::R_390_GOTOFF16
:
2790 case elfcpp::R_390_GOTOFF32
:
2791 case elfcpp::R_390_GOTOFF64
:
2792 case elfcpp::R_390_PLTOFF16
:
2793 case elfcpp::R_390_PLTOFF32
:
2794 case elfcpp::R_390_PLTOFF64
:
2795 // We need a GOT section.
2796 target
->got_section(symtab
, layout
);
2797 // For PLTOFF*, we also need a PLT entry (but only if the
2798 // symbol is not fully resolved).
2799 if ((r_type
== elfcpp::R_390_PLTOFF16
2800 || r_type
== elfcpp::R_390_PLTOFF32
2801 || r_type
== elfcpp::R_390_PLTOFF64
)
2802 && !gsym
->final_value_is_known())
2803 target
->make_plt_entry(symtab
, layout
, gsym
);
2806 case elfcpp::R_390_GOT12
:
2807 case elfcpp::R_390_GOT16
:
2808 case elfcpp::R_390_GOT20
:
2809 case elfcpp::R_390_GOT32
:
2810 case elfcpp::R_390_GOT64
:
2811 case elfcpp::R_390_GOTENT
:
2812 case elfcpp::R_390_GOTPLT12
:
2813 case elfcpp::R_390_GOTPLT16
:
2814 case elfcpp::R_390_GOTPLT20
:
2815 case elfcpp::R_390_GOTPLT32
:
2816 case elfcpp::R_390_GOTPLT64
:
2817 case elfcpp::R_390_GOTPLTENT
:
2819 // The symbol requires a GOT entry.
2820 Output_data_got
<size
, true>* got
= target
->got_section(symtab
, layout
);
2822 if (gsym
->final_value_is_known())
2824 // For a STT_GNU_IFUNC symbol we want the PLT address.
2825 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
2826 got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
2828 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
2832 // If this symbol is not fully resolved, we need to add a
2833 // dynamic relocation for it.
2834 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2836 // Use a GLOB_DAT rather than a RELATIVE reloc if:
2838 // 1) The symbol may be defined in some other module.
2840 // 2) We are building a shared library and this is a
2841 // protected symbol; using GLOB_DAT means that the dynamic
2842 // linker can use the address of the PLT in the main
2843 // executable when appropriate so that function address
2844 // comparisons work.
2846 // 3) This is a STT_GNU_IFUNC symbol in position dependent
2847 // code, again so that function address comparisons work.
2848 if (gsym
->is_from_dynobj()
2849 || gsym
->is_undefined()
2850 || gsym
->is_preemptible()
2851 || (gsym
->visibility() == elfcpp::STV_PROTECTED
2852 && parameters
->options().shared())
2853 || (gsym
->type() == elfcpp::STT_GNU_IFUNC
2854 && parameters
->options().output_is_position_independent()))
2855 got
->add_global_with_rel(gsym
, GOT_TYPE_STANDARD
, rela_dyn
,
2856 elfcpp::R_390_GLOB_DAT
);
2859 // For a STT_GNU_IFUNC symbol we want to write the PLT
2860 // offset into the GOT, so that function pointer
2861 // comparisons work correctly.
2863 if (gsym
->type() != elfcpp::STT_GNU_IFUNC
)
2864 is_new
= got
->add_global(gsym
, GOT_TYPE_STANDARD
);
2867 is_new
= got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
2868 // Tell the dynamic linker to use the PLT address
2869 // when resolving relocations.
2870 if (gsym
->is_from_dynobj()
2871 && !parameters
->options().shared())
2872 gsym
->set_needs_dynsym_value();
2876 unsigned int got_off
= gsym
->got_offset(GOT_TYPE_STANDARD
);
2877 rela_dyn
->add_global_relative(gsym
,
2878 elfcpp::R_390_RELATIVE
,
2879 got
, got_off
, 0, false);
2886 case elfcpp::R_390_COPY
:
2887 case elfcpp::R_390_GLOB_DAT
:
2888 case elfcpp::R_390_JMP_SLOT
:
2889 case elfcpp::R_390_RELATIVE
:
2890 case elfcpp::R_390_IRELATIVE
:
2891 // These are outstanding tls relocs, which are unexpected when linking
2892 case elfcpp::R_390_TLS_TPOFF
:
2893 case elfcpp::R_390_TLS_DTPOFF
:
2894 case elfcpp::R_390_TLS_DTPMOD
:
2895 gold_error(_("%s: unexpected reloc %u in object file"),
2896 object
->name().c_str(), r_type
);
2899 // These are initial tls relocs, which are expected for global()
2900 case elfcpp::R_390_TLS_GD32
: // Global-dynamic
2901 case elfcpp::R_390_TLS_GD64
:
2902 case elfcpp::R_390_TLS_GDCALL
:
2903 case elfcpp::R_390_TLS_LDM32
: // Local-dynamic
2904 case elfcpp::R_390_TLS_LDM64
:
2905 case elfcpp::R_390_TLS_LDO32
:
2906 case elfcpp::R_390_TLS_LDO64
:
2907 case elfcpp::R_390_TLS_LDCALL
:
2908 case elfcpp::R_390_TLS_IE32
: // Initial-exec
2909 case elfcpp::R_390_TLS_IE64
:
2910 case elfcpp::R_390_TLS_IEENT
:
2911 case elfcpp::R_390_TLS_GOTIE12
:
2912 case elfcpp::R_390_TLS_GOTIE20
:
2913 case elfcpp::R_390_TLS_GOTIE32
:
2914 case elfcpp::R_390_TLS_GOTIE64
:
2915 case elfcpp::R_390_TLS_LOAD
:
2916 case elfcpp::R_390_TLS_LE32
: // Local-exec
2917 case elfcpp::R_390_TLS_LE64
:
2919 // For the optimizable Initial-Exec model, we can treat undef symbols
2920 // as final when building an executable.
2921 const bool is_final
= (gsym
->final_value_is_known() ||
2922 ((r_type
== elfcpp::R_390_TLS_IE32
||
2923 r_type
== elfcpp::R_390_TLS_IE64
||
2924 r_type
== elfcpp::R_390_TLS_GOTIE32
||
2925 r_type
== elfcpp::R_390_TLS_GOTIE64
) &&
2926 gsym
->is_undefined() &&
2927 parameters
->options().output_is_executable()));
2928 const tls::Tls_optimization optimized_type
2929 = Target_s390
<size
>::optimize_tls_reloc(is_final
, r_type
);
2932 case elfcpp::R_390_TLS_GD32
: // General-dynamic
2933 case elfcpp::R_390_TLS_GD64
:
2934 case elfcpp::R_390_TLS_GDCALL
:
2935 if (optimized_type
== tls::TLSOPT_NONE
)
2937 // Create a pair of GOT entries for the module index and
2938 // dtv-relative offset.
2939 Output_data_got
<size
, true>* got
2940 = target
->got_section(symtab
, layout
);
2941 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_PAIR
,
2942 target
->rela_dyn_section(layout
),
2943 elfcpp::R_390_TLS_DTPMOD
,
2944 elfcpp::R_390_TLS_DTPOFF
);
2946 else if (optimized_type
== tls::TLSOPT_TO_IE
)
2948 // Create a GOT entry for the tp-relative offset.
2949 Output_data_got
<size
, true>* got
2950 = target
->got_section(symtab
, layout
);
2951 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_OFFSET
,
2952 target
->rela_dyn_section(layout
),
2953 elfcpp::R_390_TLS_TPOFF
);
2955 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
2956 unsupported_reloc_global(object
, r_type
, gsym
);
2959 case elfcpp::R_390_TLS_LDM32
: // Local-dynamic
2960 case elfcpp::R_390_TLS_LDM64
:
2961 case elfcpp::R_390_TLS_LDCALL
:
2962 if (optimized_type
== tls::TLSOPT_NONE
)
2964 // Create a GOT entry for the module index.
2965 target
->got_mod_index_entry(symtab
, layout
, object
);
2967 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
2968 unsupported_reloc_global(object
, r_type
, gsym
);
2971 case elfcpp::R_390_TLS_LDO32
:
2972 case elfcpp::R_390_TLS_LDO64
:
2975 case elfcpp::R_390_TLS_IE32
: // Initial-exec
2976 case elfcpp::R_390_TLS_IE64
:
2977 // These two involve an absolute address
2978 if (parameters
->options().shared())
2980 if ((size
== 32 && r_type
== elfcpp::R_390_TLS_IE32
) ||
2981 (size
== 64 && r_type
== elfcpp::R_390_TLS_IE64
))
2983 // We need to create a dynamic relocation.
2984 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2985 rela_dyn
->add_global_relative(gsym
, elfcpp::R_390_RELATIVE
,
2986 output_section
, object
,
2988 reloc
.get_r_offset(),
2989 reloc
.get_r_addend(), false);
2993 unsupported_reloc_global(object
, r_type
, gsym
);
2997 case elfcpp::R_390_TLS_IEENT
:
2998 case elfcpp::R_390_TLS_GOTIE12
:
2999 case elfcpp::R_390_TLS_GOTIE20
:
3000 case elfcpp::R_390_TLS_GOTIE32
:
3001 case elfcpp::R_390_TLS_GOTIE64
:
3002 case elfcpp::R_390_TLS_LOAD
:
3003 layout
->set_has_static_tls();
3004 if (optimized_type
== tls::TLSOPT_NONE
)
3006 if (is_final
&& !parameters
->options().shared())
3008 // We're making an executable, and the symbol is local, but
3009 // we cannot optimize to LE. Make a const GOT entry instead.
3010 Output_data_got
<size
, true>* got
3011 = target
->got_section(symtab
, layout
);
3012 got
->add_global_plt(gsym
, GOT_TYPE_TLS_OFFSET
);
3016 // Create a GOT entry for the tp-relative offset.
3017 Output_data_got
<size
, true>* got
3018 = target
->got_section(symtab
, layout
);
3019 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_OFFSET
,
3020 target
->rela_dyn_section(layout
),
3021 elfcpp::R_390_TLS_TPOFF
);
3024 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
3025 unsupported_reloc_global(object
, r_type
, gsym
);
3028 case elfcpp::R_390_TLS_LE32
: // Local-exec
3029 case elfcpp::R_390_TLS_LE64
:
3030 layout
->set_has_static_tls();
3031 if (parameters
->options().shared())
3033 // We need to create a dynamic relocation.
3034 if ((size
== 32 && r_type
== elfcpp::R_390_TLS_LE32
) ||
3035 (size
== 64 && r_type
== elfcpp::R_390_TLS_LE64
))
3037 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
3038 rela_dyn
->add_global(gsym
, elfcpp::R_390_TLS_TPOFF
,
3039 output_section
, object
,
3040 data_shndx
, reloc
.get_r_offset(),
3041 reloc
.get_r_addend());
3045 unsupported_reloc_global(object
, r_type
, gsym
);
3057 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
3058 object
->name().c_str(), r_type
,
3059 gsym
->demangled_name().c_str());
3065 // Report an unsupported relocation against a global symbol.
3069 Target_s390
<size
>::Scan::unsupported_reloc_global(
3070 Sized_relobj_file
<size
, true>* object
,
3071 unsigned int r_type
,
3074 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
3075 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
3078 // Returns true if this relocation type could be that of a function pointer.
3081 Target_s390
<size
>::Scan::possible_function_pointer_reloc(unsigned int r_type
)
3085 case elfcpp::R_390_32
:
3086 case elfcpp::R_390_64
:
3087 case elfcpp::R_390_PC32DBL
: // could be used by larl insn
3088 case elfcpp::R_390_GOT12
:
3089 case elfcpp::R_390_GOT16
:
3090 case elfcpp::R_390_GOT20
:
3091 case elfcpp::R_390_GOT32
:
3092 case elfcpp::R_390_GOT64
:
3093 case elfcpp::R_390_GOTENT
:
3094 case elfcpp::R_390_GOTOFF16
:
3095 case elfcpp::R_390_GOTOFF32
:
3096 case elfcpp::R_390_GOTOFF64
:
3102 // For safe ICF, scan a relocation for a local symbol to check if it
3103 // corresponds to a function pointer being taken. In that case mark
3104 // the function whose pointer was taken as not foldable.
3108 Target_s390
<size
>::Scan::local_reloc_may_be_function_pointer(
3111 Target_s390
<size
>* ,
3112 Sized_relobj_file
<size
, true>* ,
3115 const elfcpp::Rela
<size
, true>& ,
3116 unsigned int r_type
,
3117 const elfcpp::Sym
<size
, true>&)
3119 // When building a shared library, do not fold any local symbols.
3120 return (parameters
->options().shared()
3121 || possible_function_pointer_reloc(r_type
));
3124 // For safe ICF, scan a relocation for a global symbol to check if it
3125 // corresponds to a function pointer being taken. In that case mark
3126 // the function whose pointer was taken as not foldable.
3130 Target_s390
<size
>::Scan::global_reloc_may_be_function_pointer(
3133 Target_s390
<size
>* ,
3134 Sized_relobj_file
<size
, true>* ,
3137 const elfcpp::Rela
<size
, true>& ,
3138 unsigned int r_type
,
3141 // When building a shared library, do not fold symbols whose visibility
3142 // is hidden, internal or protected.
3143 return ((parameters
->options().shared()
3144 && (gsym
->visibility() == elfcpp::STV_INTERNAL
3145 || gsym
->visibility() == elfcpp::STV_PROTECTED
3146 || gsym
->visibility() == elfcpp::STV_HIDDEN
))
3147 || possible_function_pointer_reloc(r_type
));
3152 Target_s390
<size
>::gc_process_relocs(Symbol_table
* symtab
,
3154 Sized_relobj_file
<size
, true>* object
,
3155 unsigned int data_shndx
,
3156 unsigned int sh_type
,
3157 const unsigned char* prelocs
,
3159 Output_section
* output_section
,
3160 bool needs_special_offset_handling
,
3161 size_t local_symbol_count
,
3162 const unsigned char* plocal_symbols
)
3164 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, true>
3167 if (sh_type
== elfcpp::SHT_REL
)
3170 gold::gc_process_relocs
<size
, true, Target_s390
<size
>, Scan
, Classify_reloc
>(
3179 needs_special_offset_handling
,
3184 // Perform a relocation.
3188 Target_s390
<size
>::Relocate::relocate(
3189 const Relocate_info
<size
, true>* relinfo
,
3191 Target_s390
<size
>* target
,
3194 const unsigned char* preloc
,
3195 const Sized_symbol
<size
>* gsym
,
3196 const Symbol_value
<size
>* psymval
,
3197 unsigned char* view
,
3198 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
3199 section_size_type view_size
)
3204 const elfcpp::Rela
<size
, true> rela(preloc
);
3205 unsigned int r_type
= elfcpp::elf_r_type
<size
>(rela
.get_r_info());
3206 const Sized_relobj_file
<size
, true>* object
= relinfo
->object
;
3208 // Pick the value to use for symbols defined in the PLT.
3209 Symbol_value
<size
> symval
;
3211 && gsym
->use_plt_offset(Scan::get_reference_flags(r_type
)))
3213 symval
.set_output_value(target
->plt_address_for_global(gsym
));
3216 else if (gsym
== NULL
&& psymval
->is_ifunc_symbol())
3218 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
3219 if (object
->local_has_plt_offset(r_sym
))
3221 symval
.set_output_value(target
->plt_address_for_local(object
, r_sym
));
3226 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
3228 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
= 0;
3232 case elfcpp::R_390_PLT64
:
3233 case elfcpp::R_390_PLT32
:
3234 case elfcpp::R_390_PLT32DBL
:
3235 case elfcpp::R_390_PLT24DBL
:
3236 case elfcpp::R_390_PLT16DBL
:
3237 case elfcpp::R_390_PLT12DBL
:
3238 gold_assert(gsym
== NULL
3239 || gsym
->has_plt_offset()
3240 || gsym
->final_value_is_known()
3241 || (gsym
->is_defined()
3242 && !gsym
->is_from_dynobj()
3243 && !gsym
->is_preemptible()));
3245 case elfcpp::R_390_8
:
3246 case elfcpp::R_390_12
:
3247 case elfcpp::R_390_16
:
3248 case elfcpp::R_390_20
:
3249 case elfcpp::R_390_32
:
3250 case elfcpp::R_390_64
:
3251 case elfcpp::R_390_PC16
:
3252 case elfcpp::R_390_PC32
:
3253 case elfcpp::R_390_PC64
:
3254 case elfcpp::R_390_PC32DBL
:
3255 case elfcpp::R_390_PC24DBL
:
3256 case elfcpp::R_390_PC16DBL
:
3257 case elfcpp::R_390_PC12DBL
:
3258 value
= psymval
->value(object
, addend
);
3261 case elfcpp::R_390_GOTPC
:
3262 case elfcpp::R_390_GOTPCDBL
:
3263 gold_assert(gsym
!= NULL
);
3264 value
= target
->got_address() + addend
;
3267 case elfcpp::R_390_PLTOFF64
:
3268 case elfcpp::R_390_PLTOFF32
:
3269 case elfcpp::R_390_PLTOFF16
:
3270 gold_assert(gsym
== NULL
3271 || gsym
->has_plt_offset()
3272 || gsym
->final_value_is_known());
3274 case elfcpp::R_390_GOTOFF64
:
3275 case elfcpp::R_390_GOTOFF32
:
3276 case elfcpp::R_390_GOTOFF16
:
3277 value
= (psymval
->value(object
, addend
)
3278 - target
->got_address());
3281 case elfcpp::R_390_GOT12
:
3282 case elfcpp::R_390_GOT16
:
3283 case elfcpp::R_390_GOT20
:
3284 case elfcpp::R_390_GOT32
:
3285 case elfcpp::R_390_GOT64
:
3286 case elfcpp::R_390_GOTENT
:
3287 case elfcpp::R_390_GOTPLT12
:
3288 case elfcpp::R_390_GOTPLT16
:
3289 case elfcpp::R_390_GOTPLT20
:
3290 case elfcpp::R_390_GOTPLT32
:
3291 case elfcpp::R_390_GOTPLT64
:
3292 case elfcpp::R_390_GOTPLTENT
:
3294 unsigned int got_offset
= 0;
3297 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
3298 got_offset
= gsym
->got_offset(GOT_TYPE_STANDARD
);
3302 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
3303 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
3304 got_offset
= object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
);
3306 value
= got_offset
+ target
->got_main_offset() + addend
;
3310 // These are initial tls relocs, which are expected when linking
3311 case elfcpp::R_390_TLS_LOAD
:
3312 case elfcpp::R_390_TLS_GDCALL
: // Global-dynamic
3313 case elfcpp::R_390_TLS_GD32
:
3314 case elfcpp::R_390_TLS_GD64
:
3315 case elfcpp::R_390_TLS_LDCALL
: // Local-dynamic
3316 case elfcpp::R_390_TLS_LDM32
:
3317 case elfcpp::R_390_TLS_LDM64
:
3318 case elfcpp::R_390_TLS_LDO32
:
3319 case elfcpp::R_390_TLS_LDO64
:
3320 case elfcpp::R_390_TLS_GOTIE12
: // Initial-exec
3321 case elfcpp::R_390_TLS_GOTIE20
:
3322 case elfcpp::R_390_TLS_GOTIE32
:
3323 case elfcpp::R_390_TLS_GOTIE64
:
3324 case elfcpp::R_390_TLS_IE32
:
3325 case elfcpp::R_390_TLS_IE64
:
3326 case elfcpp::R_390_TLS_IEENT
:
3327 case elfcpp::R_390_TLS_LE32
: // Local-exec
3328 case elfcpp::R_390_TLS_LE64
:
3329 value
= this->relocate_tls(relinfo
, target
, relnum
, rela
, r_type
, gsym
, psymval
,
3337 typename S390_relocate_functions
<size
>::Status status
3338 = S390_relocate_functions
<size
>::STATUS_OK
;
3342 case elfcpp::R_390_NONE
:
3343 case elfcpp::R_390_GNU_VTINHERIT
:
3344 case elfcpp::R_390_GNU_VTENTRY
:
3345 case elfcpp::R_390_TLS_GDCALL
:
3346 case elfcpp::R_390_TLS_LDCALL
:
3347 case elfcpp::R_390_TLS_LOAD
:
3350 case elfcpp::R_390_64
:
3351 case elfcpp::R_390_GOT64
:
3352 case elfcpp::R_390_GOTPLT64
:
3353 case elfcpp::R_390_PLTOFF64
:
3354 case elfcpp::R_390_GOTOFF64
:
3355 case elfcpp::R_390_TLS_GD64
:
3356 case elfcpp::R_390_TLS_LDM64
:
3357 case elfcpp::R_390_TLS_LDO64
:
3358 case elfcpp::R_390_TLS_GOTIE64
:
3359 case elfcpp::R_390_TLS_IE64
:
3360 case elfcpp::R_390_TLS_LE64
:
3361 Relocate_functions
<size
, true>::rela64(view
, value
, 0);
3364 case elfcpp::R_390_32
:
3365 case elfcpp::R_390_GOT32
:
3366 case elfcpp::R_390_GOTPLT32
:
3367 case elfcpp::R_390_PLTOFF32
:
3368 case elfcpp::R_390_GOTOFF32
:
3369 case elfcpp::R_390_TLS_GD32
:
3370 case elfcpp::R_390_TLS_LDM32
:
3371 case elfcpp::R_390_TLS_LDO32
:
3372 case elfcpp::R_390_TLS_GOTIE32
:
3373 case elfcpp::R_390_TLS_IE32
:
3374 case elfcpp::R_390_TLS_LE32
:
3375 Relocate_functions
<size
, true>::rela32(view
, value
, 0);
3378 case elfcpp::R_390_20
:
3379 case elfcpp::R_390_GOT20
:
3380 case elfcpp::R_390_GOTPLT20
:
3381 case elfcpp::R_390_TLS_GOTIE20
:
3382 status
= S390_relocate_functions
<size
>::rela20(view
, value
);
3385 case elfcpp::R_390_16
:
3386 case elfcpp::R_390_GOT16
:
3387 case elfcpp::R_390_GOTPLT16
:
3388 case elfcpp::R_390_PLTOFF16
:
3389 case elfcpp::R_390_GOTOFF16
:
3390 status
= S390_relocate_functions
<size
>::rela16(view
, value
);
3393 case elfcpp::R_390_12
:
3394 case elfcpp::R_390_GOT12
:
3395 case elfcpp::R_390_GOTPLT12
:
3396 case elfcpp::R_390_TLS_GOTIE12
:
3397 status
= S390_relocate_functions
<size
>::rela12(view
, value
);
3400 case elfcpp::R_390_8
:
3401 Relocate_functions
<size
, true>::rela8(view
, value
, 0);
3404 case elfcpp::R_390_PC16
:
3405 Relocate_functions
<size
, true>::pcrela16(view
, value
, 0,
3409 case elfcpp::R_390_PLT64
:
3410 case elfcpp::R_390_PC64
:
3411 Relocate_functions
<size
, true>::pcrela64(view
, value
, 0, address
);
3414 case elfcpp::R_390_PLT32
:
3415 case elfcpp::R_390_PC32
:
3416 case elfcpp::R_390_GOTPC
:
3417 Relocate_functions
<size
, true>::pcrela32(view
, value
, 0, address
);
3420 case elfcpp::R_390_PLT32DBL
:
3421 case elfcpp::R_390_PC32DBL
:
3422 case elfcpp::R_390_GOTPCDBL
:
3423 status
= S390_relocate_functions
<size
>::pcrela32dbl(view
, value
, address
);
3426 case elfcpp::R_390_PLT24DBL
:
3427 case elfcpp::R_390_PC24DBL
:
3428 status
= S390_relocate_functions
<size
>::pcrela24dbl(view
, value
, address
);
3431 case elfcpp::R_390_PLT16DBL
:
3432 case elfcpp::R_390_PC16DBL
:
3433 status
= S390_relocate_functions
<size
>::pcrela16dbl(view
, value
, address
);
3436 case elfcpp::R_390_PLT12DBL
:
3437 case elfcpp::R_390_PC12DBL
:
3438 status
= S390_relocate_functions
<size
>::pcrela12dbl(view
, value
, address
);
3441 case elfcpp::R_390_GOTENT
:
3442 case elfcpp::R_390_GOTPLTENT
:
3443 case elfcpp::R_390_TLS_IEENT
:
3444 value
+= target
->got_address();
3445 status
= S390_relocate_functions
<size
>::pcrela32dbl(view
, value
, address
);
3448 case elfcpp::R_390_COPY
:
3449 case elfcpp::R_390_GLOB_DAT
:
3450 case elfcpp::R_390_JMP_SLOT
:
3451 case elfcpp::R_390_RELATIVE
:
3452 case elfcpp::R_390_IRELATIVE
:
3453 // These are outstanding tls relocs, which are unexpected when linking
3454 case elfcpp::R_390_TLS_TPOFF
:
3455 case elfcpp::R_390_TLS_DTPMOD
:
3456 case elfcpp::R_390_TLS_DTPOFF
:
3457 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3458 _("unexpected reloc %u in object file"),
3463 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3464 _("unsupported reloc %u"),
3469 if (status
!= S390_relocate_functions
<size
>::STATUS_OK
)
3471 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3472 _("relocation overflow"));
3478 // Perform a TLS relocation.
3481 inline typename
elfcpp::Elf_types
<size
>::Elf_Addr
3482 Target_s390
<size
>::Relocate::relocate_tls(
3483 const Relocate_info
<size
, true>* relinfo
,
3484 Target_s390
<size
>* target
,
3486 const elfcpp::Rela
<size
, true>& rela
,
3487 unsigned int r_type
,
3488 const Sized_symbol
<size
>* gsym
,
3489 const Symbol_value
<size
>* psymval
,
3490 unsigned char* view
,
3491 section_size_type view_size
)
3493 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
3495 const Sized_relobj_file
<size
, true>* object
= relinfo
->object
;
3496 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
3497 elfcpp::Shdr
<size
, true> data_shdr(relinfo
->data_shdr
);
3498 bool is_allocatable
= (data_shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) != 0;
3500 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
3501 = psymval
->value(relinfo
->object
, addend
);
3503 const bool is_final
= (gsym
== NULL
3504 ? !parameters
->options().shared()
3505 : gsym
->final_value_is_known());
3506 tls::Tls_optimization optimized_type
3507 = Target_s390
<size
>::optimize_tls_reloc(is_final
, r_type
);
3510 case elfcpp::R_390_TLS_GDCALL
: // Global-dynamic marker
3511 if (optimized_type
== tls::TLSOPT_TO_LE
)
3513 if (tls_segment
== NULL
)
3515 gold_assert(parameters
->errors()->error_count() > 0
3516 || issue_undefined_symbol_error(gsym
));
3519 this->tls_gd_to_le(relinfo
, relnum
, rela
, view
, view_size
);
3524 if (optimized_type
== tls::TLSOPT_TO_IE
)
3526 this->tls_gd_to_ie(relinfo
, relnum
, rela
, view
, view_size
);
3529 else if (optimized_type
== tls::TLSOPT_NONE
)
3534 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3535 _("unsupported reloc %u"), r_type
);
3538 case elfcpp::R_390_TLS_GD32
: // Global-dynamic
3539 case elfcpp::R_390_TLS_GD64
:
3540 if (optimized_type
== tls::TLSOPT_TO_LE
)
3542 if (tls_segment
== NULL
)
3544 gold_assert(parameters
->errors()->error_count() > 0
3545 || issue_undefined_symbol_error(gsym
));
3548 return value
- tls_segment
->memsz();
3552 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
3553 ? GOT_TYPE_TLS_OFFSET
3554 : GOT_TYPE_TLS_PAIR
);
3557 gold_assert(gsym
->has_got_offset(got_type
));
3558 return (gsym
->got_offset(got_type
)
3559 + target
->got_main_offset()
3564 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
3565 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
3566 return (object
->local_got_offset(r_sym
, got_type
)
3567 + target
->got_main_offset()
3571 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3572 _("unsupported reloc %u"), r_type
);
3575 case elfcpp::R_390_TLS_LDCALL
: // Local-dynamic marker
3576 // This is a marker relocation. If the sequence is being turned to LE,
3577 // we modify the instruction, otherwise the instruction is untouched.
3578 if (optimized_type
== tls::TLSOPT_TO_LE
)
3580 if (tls_segment
== NULL
)
3582 gold_assert(parameters
->errors()->error_count() > 0
3583 || issue_undefined_symbol_error(gsym
));
3586 this->tls_ld_to_le(relinfo
, relnum
, rela
, view
, view_size
);
3589 else if (optimized_type
== tls::TLSOPT_NONE
)
3593 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3594 _("unsupported reloc %u"), r_type
);
3597 case elfcpp::R_390_TLS_LDM32
: // Local-dynamic module
3598 case elfcpp::R_390_TLS_LDM64
:
3599 if (optimized_type
== tls::TLSOPT_TO_LE
)
3601 if (tls_segment
== NULL
)
3603 gold_assert(parameters
->errors()->error_count() > 0
3604 || issue_undefined_symbol_error(gsym
));
3607 // Doesn't matter what we fill it with - it's going to be unused.
3610 else if (optimized_type
== tls::TLSOPT_NONE
)
3612 // Relocate the field with the offset of the GOT entry for
3613 // the module index.
3614 return (target
->got_mod_index_entry(NULL
, NULL
, NULL
)
3616 + target
->got_main_offset());
3618 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3619 _("unsupported reloc %u"), r_type
);
3622 case elfcpp::R_390_TLS_LDO32
: // Local-dynamic offset
3623 case elfcpp::R_390_TLS_LDO64
:
3624 // This relocation type is used in debugging information.
3625 // In that case we need to not optimize the value. If the
3626 // section is not allocatable, then we assume we should not
3627 // optimize this reloc.
3628 if (optimized_type
== tls::TLSOPT_TO_LE
&& is_allocatable
)
3630 if (tls_segment
== NULL
)
3632 gold_assert(parameters
->errors()->error_count() > 0
3633 || issue_undefined_symbol_error(gsym
));
3636 value
-= tls_segment
->memsz();
3640 case elfcpp::R_390_TLS_LOAD
: // Initial-exec marker
3641 // This is a marker relocation. If the sequence is being turned to LE,
3642 // we modify the instruction, otherwise the instruction is untouched.
3644 && gsym
->is_undefined()
3645 && parameters
->options().output_is_executable())
3647 Target_s390
<size
>::Relocate::tls_ie_to_le(relinfo
, relnum
,
3652 else if (optimized_type
== tls::TLSOPT_TO_LE
)
3654 if (tls_segment
== NULL
)
3656 gold_assert(parameters
->errors()->error_count() > 0
3657 || issue_undefined_symbol_error(gsym
));
3660 Target_s390
<size
>::Relocate::tls_ie_to_le(relinfo
, relnum
,
3665 else if (optimized_type
== tls::TLSOPT_NONE
)
3669 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3670 _("unsupported reloc type %u"),
3674 case elfcpp::R_390_TLS_GOTIE12
: // Initial-exec, not optimizable
3675 case elfcpp::R_390_TLS_GOTIE20
:
3676 case elfcpp::R_390_TLS_IEENT
:
3677 case elfcpp::R_390_TLS_GOTIE32
: // Initial-exec, optimizable
3678 case elfcpp::R_390_TLS_GOTIE64
:
3679 case elfcpp::R_390_TLS_IE32
:
3680 case elfcpp::R_390_TLS_IE64
:
3682 && gsym
->is_undefined()
3683 && parameters
->options().output_is_executable()
3684 // These three cannot be optimized to LE, no matter what
3685 && r_type
!= elfcpp::R_390_TLS_GOTIE12
3686 && r_type
!= elfcpp::R_390_TLS_GOTIE20
3687 && r_type
!= elfcpp::R_390_TLS_IEENT
)
3691 else if (optimized_type
== tls::TLSOPT_TO_LE
)
3693 if (tls_segment
== NULL
)
3695 gold_assert(parameters
->errors()->error_count() > 0
3696 || issue_undefined_symbol_error(gsym
));
3699 return value
- tls_segment
->memsz();
3701 else if (optimized_type
== tls::TLSOPT_NONE
)
3703 // Relocate the field with the offset of the GOT entry for
3704 // the tp-relative offset of the symbol.
3705 unsigned int got_offset
;
3708 gold_assert(gsym
->has_got_offset(GOT_TYPE_TLS_OFFSET
));
3709 got_offset
= gsym
->got_offset(GOT_TYPE_TLS_OFFSET
);
3713 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
3714 gold_assert(object
->local_has_got_offset(r_sym
,
3715 GOT_TYPE_TLS_OFFSET
));
3716 got_offset
= object
->local_got_offset(r_sym
, GOT_TYPE_TLS_OFFSET
);
3718 got_offset
+= target
->got_main_offset();
3719 if (r_type
== elfcpp::R_390_TLS_IE32
3720 || r_type
== elfcpp::R_390_TLS_IE64
)
3721 return target
->got_address() + got_offset
+ addend
;
3723 return got_offset
+ addend
;
3725 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3726 _("unsupported reloc type %u"),
3730 case elfcpp::R_390_TLS_LE32
: // Local-exec
3731 case elfcpp::R_390_TLS_LE64
:
3732 if (tls_segment
== NULL
)
3734 gold_assert(parameters
->errors()->error_count() > 0
3735 || issue_undefined_symbol_error(gsym
));
3738 return value
- tls_segment
->memsz();
3743 // Do a relocation in which we convert a TLS General-Dynamic to an
3748 Target_s390
<size
>::Relocate::tls_gd_to_ie(
3749 const Relocate_info
<size
, true>* relinfo
,
3751 const elfcpp::Rela
<size
, true>& rela
,
3752 unsigned char* view
,
3753 section_size_type view_size
)
3755 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
3756 if (view
[0] == 0x4d)
3758 // bas, don't care about details
3759 // Change to l %r2, 0(%r2, %r12)
3766 else if (view
[0] == 0xc0)
3768 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 6);
3769 // brasl %r14, __tls_get_offset@plt
3770 if (view
[1] == 0xe5)
3772 // Change to l/lg %r2, 0(%r2, %r12)
3773 // There was a PLT32DBL reloc at the last 4 bytes, overwrite its result.
3798 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3799 _("unsupported op for GD to IE"));
3802 // Do a relocation in which we convert a TLS General-Dynamic to a
3807 Target_s390
<size
>::Relocate::tls_gd_to_le(
3808 const Relocate_info
<size
, true>* relinfo
,
3810 const elfcpp::Rela
<size
, true>& rela
,
3811 unsigned char* view
,
3812 section_size_type view_size
)
3814 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 2);
3815 if (view
[0] == 0x0d)
3817 // basr, change to nop
3821 else if (view
[0] == 0x4d)
3823 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
3824 // bas, don't care about details, change to nop
3831 else if (view
[0] == 0xc0)
3833 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 6);
3834 // brasl %r14, __tls_get_offset@plt
3835 if (view
[1] == 0xe5)
3837 // Change to nop jump. There was a PLT32DBL reloc at the last
3838 // 4 bytes, overwrite its result.
3847 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3848 _("unsupported op for GD to LE"));
3853 Target_s390
<size
>::Relocate::tls_ld_to_le(
3854 const Relocate_info
<size
, true>* relinfo
,
3856 const elfcpp::Rela
<size
, true>& rela
,
3857 unsigned char* view
,
3858 section_size_type view_size
)
3860 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
3862 if (view
[0] == 0x0d)
3864 // basr, change to nop
3868 else if (view
[0] == 0x4d)
3870 // bas, don't care about details, change to nop
3877 else if (view
[0] == 0xc0)
3879 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 6);
3880 // brasl %r14, __tls_get_offset@plt
3881 if (view
[1] == 0xe5)
3883 // Change to nop jump. There was a PLT32DBL reloc at the last
3884 // 4 bytes, overwrite its result.
3893 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3894 _("unsupported op for LD to LE"));
3897 // Do a relocation in which we convert a TLS Initial-Exec to a
3902 Target_s390
<size
>::Relocate::tls_ie_to_le(
3903 const Relocate_info
<size
, true>* relinfo
,
3905 const elfcpp::Rela
<size
, true>& rela
,
3906 unsigned char* view
,
3907 section_size_type view_size
)
3909 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
3911 if (view
[0] == 0x58)
3913 // l %rX, 0(%rY) or l %rX, 0(%rY, %r12)
3914 if ((view
[2] & 0x0f) != 0 || view
[3] != 0)
3916 int rx
= view
[1] >> 4 & 0xf;
3917 int ry
= view
[1] & 0xf;
3918 int rz
= view
[2] >> 4 & 0xf;
3937 view
[1] = rx
<< 4 | ry
;
3942 else if (view
[0] == 0xe3)
3944 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 6);
3945 // lg %rX, 0(%rY) or lg %rX, 0(%rY, %r12)
3946 if ((view
[2] & 0x0f) != 0 ||
3951 int rx
= view
[1] >> 4 & 0xf;
3952 int ry
= view
[1] & 0xf;
3953 int rz
= view
[2] >> 4 & 0xf;
3970 // to sllg %rX, $rY, 0
3972 view
[1] = rx
<< 4 | ry
;
3981 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3982 _("unsupported op for IE to LE"));
3986 // Scan relocations for a section.
3990 Target_s390
<size
>::scan_relocs(Symbol_table
* symtab
,
3992 Sized_relobj_file
<size
, true>* object
,
3993 unsigned int data_shndx
,
3994 unsigned int sh_type
,
3995 const unsigned char* prelocs
,
3997 Output_section
* output_section
,
3998 bool needs_special_offset_handling
,
3999 size_t local_symbol_count
,
4000 const unsigned char* plocal_symbols
)
4002 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, true>
4005 if (sh_type
== elfcpp::SHT_REL
)
4007 gold_error(_("%s: unsupported REL reloc section"),
4008 object
->name().c_str());
4012 gold::scan_relocs
<size
, true, Target_s390
<size
>, Scan
, Classify_reloc
>(
4021 needs_special_offset_handling
,
4026 // Finalize the sections.
4030 Target_s390
<size
>::do_finalize_sections(
4032 const Input_objects
*,
4033 Symbol_table
* symtab
)
4035 const Reloc_section
* rel_plt
= (this->plt_
== NULL
4037 : this->plt_
->rela_plt());
4038 layout
->add_target_dynamic_tags(false, this->got_plt_
, rel_plt
,
4039 this->rela_dyn_
, true, size
== 32);
4041 this->layout_
= layout
;
4043 // Emit any relocs we saved in an attempt to avoid generating COPY
4045 if (this->copy_relocs_
.any_saved_relocs())
4046 this->copy_relocs_
.emit(this->rela_dyn_section(layout
));
4048 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
4049 // the .got section.
4050 Symbol
* sym
= this->global_offset_table_
;
4053 uint64_t data_size
= this->got_
->current_data_size();
4054 symtab
->get_sized_symbol
<size
>(sym
)->set_symsize(data_size
);
4057 if (parameters
->doing_static_link()
4058 && (this->plt_
== NULL
|| !this->plt_
->has_irelative_section()))
4060 // If linking statically, make sure that the __rela_iplt symbols
4061 // were defined if necessary, even if we didn't create a PLT.
4062 static const Define_symbol_in_segment syms
[] =
4065 "__rela_iplt_start", // name
4066 elfcpp::PT_LOAD
, // segment_type
4067 elfcpp::PF_W
, // segment_flags_set
4068 elfcpp::PF(0), // segment_flags_clear
4071 elfcpp::STT_NOTYPE
, // type
4072 elfcpp::STB_GLOBAL
, // binding
4073 elfcpp::STV_HIDDEN
, // visibility
4075 Symbol::SEGMENT_START
, // offset_from_base
4079 "__rela_iplt_end", // name
4080 elfcpp::PT_LOAD
, // segment_type
4081 elfcpp::PF_W
, // segment_flags_set
4082 elfcpp::PF(0), // segment_flags_clear
4085 elfcpp::STT_NOTYPE
, // type
4086 elfcpp::STB_GLOBAL
, // binding
4087 elfcpp::STV_HIDDEN
, // visibility
4089 Symbol::SEGMENT_START
, // offset_from_base
4094 symtab
->define_symbols(layout
, 2, syms
,
4095 layout
->script_options()->saw_sections_clause());
4099 // Scan the relocs during a relocatable link.
4103 Target_s390
<size
>::scan_relocatable_relocs(
4104 Symbol_table
* symtab
,
4106 Sized_relobj_file
<size
, true>* object
,
4107 unsigned int data_shndx
,
4108 unsigned int sh_type
,
4109 const unsigned char* prelocs
,
4111 Output_section
* output_section
,
4112 bool needs_special_offset_handling
,
4113 size_t local_symbol_count
,
4114 const unsigned char* plocal_symbols
,
4115 Relocatable_relocs
* rr
)
4117 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, true>
4119 typedef gold::Default_scan_relocatable_relocs
<Classify_reloc
>
4120 Scan_relocatable_relocs
;
4122 gold_assert(sh_type
== elfcpp::SHT_RELA
);
4124 gold::scan_relocatable_relocs
<size
, true, Scan_relocatable_relocs
>(
4132 needs_special_offset_handling
,
4138 // Scan the relocs for --emit-relocs.
4142 Target_s390
<size
>::emit_relocs_scan(
4143 Symbol_table
* symtab
,
4145 Sized_relobj_file
<size
, true>* object
,
4146 unsigned int data_shndx
,
4147 unsigned int sh_type
,
4148 const unsigned char* prelocs
,
4150 Output_section
* output_section
,
4151 bool needs_special_offset_handling
,
4152 size_t local_symbol_count
,
4153 const unsigned char* plocal_syms
,
4154 Relocatable_relocs
* rr
)
4156 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, true>
4158 typedef gold::Default_emit_relocs_strategy
<Classify_reloc
>
4159 Emit_relocs_strategy
;
4161 gold_assert(sh_type
== elfcpp::SHT_RELA
);
4163 gold::scan_relocatable_relocs
<size
, true, Emit_relocs_strategy
>(
4171 needs_special_offset_handling
,
4177 // Relocate a section during a relocatable link.
4181 Target_s390
<size
>::relocate_relocs(
4182 const Relocate_info
<size
, true>* relinfo
,
4183 unsigned int sh_type
,
4184 const unsigned char* prelocs
,
4186 Output_section
* output_section
,
4187 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
4188 unsigned char* view
,
4189 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
4190 section_size_type view_size
,
4191 unsigned char* reloc_view
,
4192 section_size_type reloc_view_size
)
4194 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, true>
4197 gold_assert(sh_type
== elfcpp::SHT_RELA
);
4199 gold::relocate_relocs
<size
, true, Classify_reloc
>(
4204 offset_in_output_section
,
4212 // Return the offset to use for the GOT_INDX'th got entry which is
4213 // for a local tls symbol specified by OBJECT, SYMNDX.
4216 Target_s390
<size
>::do_tls_offset_for_local(
4221 // The only way we can get called is when IEENT/GOTIE12/GOTIE20
4222 // couldn't be optimised to LE.
4223 Output_segment
* tls_segment
= layout_
->tls_segment();
4224 return -tls_segment
->memsz();
4227 // Return the offset to use for the GOT_INDX'th got entry which is
4228 // for global tls symbol GSYM.
4231 Target_s390
<size
>::do_tls_offset_for_global(
4235 Output_segment
* tls_segment
= layout_
->tls_segment();
4236 return -tls_segment
->memsz();
4239 // Return the value to use for a dynamic which requires special
4240 // treatment. This is how we support equality comparisons of function
4241 // pointers across shared library boundaries, as described in the
4242 // processor specific ABI supplement.
4246 Target_s390
<size
>::do_dynsym_value(const Symbol
* gsym
) const
4248 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
4249 return this->plt_address_for_global(gsym
);
4252 // Return a string used to fill a code section with nops to take up
4253 // the specified length.
4257 Target_s390
<size
>::do_code_fill(section_size_type length
) const
4260 gold_warning(_("S/390 code fill of odd length requested"));
4261 return std::string(length
, static_cast<char>(0x07));
4264 // Return whether SYM should be treated as a call to a non-split
4265 // function. We don't want that to be true of a larl instruction
4266 // that merely loads its address.
4270 Target_s390
<size
>::do_is_call_to_non_split(const Symbol
* sym
,
4271 const unsigned char* preloc
,
4272 const unsigned char* view
,
4273 section_size_type view_size
) const
4275 if (sym
->type() != elfcpp::STT_FUNC
)
4277 typename Reloc_types
<elfcpp::SHT_RELA
, size
, true>::Reloc
reloc(preloc
);
4278 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
4279 = reloc
.get_r_info();
4280 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
4281 section_offset_type offset
= reloc
.get_r_offset();
4284 // PLT refs always involve calling the function.
4285 case elfcpp::R_390_PLT12DBL
:
4286 case elfcpp::R_390_PLT16DBL
:
4287 case elfcpp::R_390_PLT24DBL
:
4288 case elfcpp::R_390_PLT32
:
4289 case elfcpp::R_390_PLT32DBL
:
4290 case elfcpp::R_390_PLT64
:
4291 case elfcpp::R_390_PLTOFF16
:
4292 case elfcpp::R_390_PLTOFF32
:
4293 case elfcpp::R_390_PLTOFF64
:
4294 // Could be used for calls for -msmall-exec.
4295 case elfcpp::R_390_PC16DBL
:
4298 // Tricky case. When used in a brasl, jg, and other branch instructions,
4299 // it's a call or a sibcall. However, when used in larl, it only loads
4300 // the function's address - not a call.
4301 case elfcpp::R_390_PC32DBL
:
4304 || offset
+ 4 > static_cast<section_offset_type
>(view_size
))
4306 // Should not happen.
4307 gold_error(_("instruction with PC32DBL not wholly within section"));
4311 uint8_t op0
= view
[offset
-2];
4312 uint8_t op1
= view
[offset
-1] & 0xf;
4315 if (op0
== 0xc0 && op1
== 0)
4318 // Otherwise, it's either a call instruction, a branch instruction
4319 // (used as a sibcall), or a data manipulation instruction (which
4320 // has no business being used on a function, and can be ignored).
4324 // Otherwise, it's probably not a call.
4330 // Code sequences to match below.
4334 Target_s390
<size
>::ss_code_bras_8
[] = {
4335 0xa7, 0x15, 0x00, 0x06, // bras %r1, .+0xc
4340 Target_s390
<size
>::ss_code_l_basr
[] = {
4341 0x58, 0xe0, 0x10, 0x00, // l %r14, 0(%r1)
4342 0x58, 0x10, 0x10, 0x04, // l %r1, 4(%r1)
4343 0x0d, 0xee, // basr %r14, %r14
4348 Target_s390
<size
>::ss_code_a_basr
[] = {
4349 0x18, 0xe1, // lr %r14, %r1
4350 0x5a, 0xe0, 0x10, 0x00, // a %r14, 0(%r1)
4351 0x5a, 0x10, 0x10, 0x04, // a %r1, 4(%r1)
4352 0x0d, 0xee, // basr %r14, %r14
4357 Target_s390
<size
>::ss_code_larl
[] = {
4358 0xc0, 0x10, // larl %r1, ...
4363 Target_s390
<size
>::ss_code_brasl
[] = {
4364 0xc0, 0xe5, // brasl %r14, ...
4369 Target_s390
<size
>::ss_code_jg
[] = {
4370 0xc0, 0xf4, // jg ...
4375 Target_s390
<size
>::ss_code_jgl
[] = {
4376 0xc0, 0x44, // jgl ...
4381 Target_s390
<32>::ss_match_st_r14(unsigned char* view
,
4382 section_size_type view_size
,
4383 section_offset_type
*offset
) const
4385 static const unsigned char ss_code_st_r14
[] = {
4386 0x50, 0xe0, 0xf0, 0x04, // st %r14, 4(%r15)
4388 if (!this->match_view_u(view
, view_size
, *offset
, ss_code_st_r14
,
4389 sizeof ss_code_st_r14
))
4391 *offset
+= sizeof ss_code_st_r14
;
4397 Target_s390
<64>::ss_match_st_r14(unsigned char* view
,
4398 section_size_type view_size
,
4399 section_offset_type
*offset
) const
4401 static const unsigned char ss_code_st_r14
[] = {
4402 0xe3, 0xe0, 0xf0, 0x08, 0x00, 0x24 // stg %r14, 8(%r15)
4404 if (!this->match_view_u(view
, view_size
, *offset
, ss_code_st_r14
,
4405 sizeof ss_code_st_r14
))
4407 *offset
+= sizeof ss_code_st_r14
;
4413 Target_s390
<32>::ss_match_l_r14(unsigned char* view
,
4414 section_size_type view_size
,
4415 section_offset_type
*offset
) const
4417 static const unsigned char ss_code_l_r14
[] = {
4418 0x58, 0xe0, 0xf0, 0x04, // l %r14, 4(%r15)
4420 if (!this->match_view_u(view
, view_size
, *offset
, ss_code_l_r14
,
4421 sizeof ss_code_l_r14
))
4423 *offset
+= sizeof ss_code_l_r14
;
4429 Target_s390
<64>::ss_match_l_r14(unsigned char* view
,
4430 section_size_type view_size
,
4431 section_offset_type
*offset
) const
4433 static const unsigned char ss_code_l_r14
[] = {
4434 0xe3, 0xe0, 0xf0, 0x08, 0x00, 0x04 // lg %r14, 8(%r15)
4436 if (!this->match_view_u(view
, view_size
, *offset
, ss_code_l_r14
,
4437 sizeof ss_code_l_r14
))
4439 *offset
+= sizeof ss_code_l_r14
;
4445 Target_s390
<size
>::ss_match_mcount(unsigned char* view
,
4446 section_size_type view_size
,
4447 section_offset_type
*offset
) const
4449 // Match the mcount call sequence.
4450 section_offset_type myoff
= *offset
;
4452 // First, look for the store instruction saving %r14.
4453 if (!this->ss_match_st_r14(view
, view_size
, &myoff
))
4456 // Now, param load and the actual call.
4457 if (this->match_view_u(view
, view_size
, myoff
, ss_code_larl
,
4458 sizeof ss_code_larl
))
4460 myoff
+= sizeof ss_code_larl
+ 4;
4462 // After larl, expect a brasl.
4463 if (!this->match_view_u(view
, view_size
, myoff
, ss_code_brasl
,
4464 sizeof ss_code_brasl
))
4466 myoff
+= sizeof ss_code_brasl
+ 4;
4468 else if (size
== 32 &&
4469 this->match_view_u(view
, view_size
, myoff
, ss_code_bras_8
,
4470 sizeof ss_code_bras_8
))
4472 // The bras skips over a block of 8 bytes, loading its address
4474 myoff
+= sizeof ss_code_bras_8
+ 8;
4476 // Now, there are two sequences used for actual load and call,
4477 // absolute and PIC.
4478 if (this->match_view_u(view
, view_size
, myoff
, ss_code_l_basr
,
4479 sizeof ss_code_l_basr
))
4480 myoff
+= sizeof ss_code_l_basr
;
4481 else if (this->match_view_u(view
, view_size
, myoff
, ss_code_a_basr
,
4482 sizeof ss_code_a_basr
))
4483 myoff
+= sizeof ss_code_a_basr
;
4490 // Finally, a load bringing %r14 back.
4491 if (!this->ss_match_l_r14(view
, view_size
, &myoff
))
4501 Target_s390
<32>::ss_match_ear(unsigned char* view
,
4502 section_size_type view_size
,
4503 section_offset_type
*offset
) const
4505 static const unsigned char ss_code_ear
[] = {
4506 0xb2, 0x4f, 0x00, 0x10, // ear %r1, %a0
4508 if (!this->match_view_u(view
, view_size
, *offset
, ss_code_ear
,
4509 sizeof ss_code_ear
))
4511 *offset
+= sizeof ss_code_ear
;
4517 Target_s390
<64>::ss_match_ear(unsigned char* view
,
4518 section_size_type view_size
,
4519 section_offset_type
*offset
) const
4521 static const unsigned char ss_code_ear
[] = {
4522 0xb2, 0x4f, 0x00, 0x10, // ear %r1, %a0
4523 0xeb, 0x11, 0x00, 0x20, 0x00, 0x0d, // sllg %r1,%r1,32
4524 0xb2, 0x4f, 0x00, 0x11, // ear %r1, %a1
4526 if (!this->match_view_u(view
, view_size
, *offset
, ss_code_ear
,
4527 sizeof ss_code_ear
))
4529 *offset
+= sizeof ss_code_ear
;
4535 Target_s390
<32>::ss_match_c(unsigned char* view
,
4536 section_size_type view_size
,
4537 section_offset_type
*offset
) const
4539 static const unsigned char ss_code_c
[] = {
4540 0x59, 0xf0, 0x10, 0x20, // c %r15, 0x20(%r1)
4542 if (!this->match_view_u(view
, view_size
, *offset
, ss_code_c
,
4545 *offset
+= sizeof ss_code_c
;
4551 Target_s390
<64>::ss_match_c(unsigned char* view
,
4552 section_size_type view_size
,
4553 section_offset_type
*offset
) const
4555 static const unsigned char ss_code_c
[] = {
4556 0xe3, 0xf0, 0x10, 0x38, 0x00, 0x20, // cg %r15, 0x38(%r1)
4558 if (!this->match_view_u(view
, view_size
, *offset
, ss_code_c
,
4561 *offset
+= sizeof ss_code_c
;
4567 Target_s390
<32>::ss_match_l(unsigned char* view
,
4568 section_size_type view_size
,
4569 section_offset_type
*offset
,
4570 int *guard_reg
) const
4572 // l %guard_reg, 0x20(%r1)
4573 if (convert_to_section_size_type(*offset
+ 4) > view_size
4574 || view
[*offset
] != 0x58
4575 || (view
[*offset
+ 1] & 0xf) != 0x0
4576 || view
[*offset
+ 2] != 0x10
4577 || view
[*offset
+ 3] != 0x20)
4580 *guard_reg
= view
[*offset
+ 1] >> 4 & 0xf;
4586 Target_s390
<64>::ss_match_l(unsigned char* view
,
4587 section_size_type view_size
,
4588 section_offset_type
*offset
,
4589 int *guard_reg
) const
4591 // lg %guard_reg, 0x38(%r1)
4592 if (convert_to_section_size_type(*offset
+ 6) > view_size
4593 || view
[*offset
] != 0xe3
4594 || (view
[*offset
+ 1] & 0xf) != 0x0
4595 || view
[*offset
+ 2] != 0x10
4596 || view
[*offset
+ 3] != 0x38
4597 || view
[*offset
+ 4] != 0x00
4598 || view
[*offset
+ 5] != 0x04)
4601 *guard_reg
= view
[*offset
+ 1] >> 4 & 0xf;
4607 Target_s390
<size
>::ss_match_ahi(unsigned char* view
,
4608 section_size_type view_size
,
4609 section_offset_type
*offset
,
4611 uint32_t *arg
) const
4613 int op
= size
== 32 ? 0xa : 0xb;
4614 // a[g]hi %guard_reg, <arg>
4615 if (convert_to_section_size_type(*offset
+ 4) > view_size
4616 || view
[*offset
] != 0xa7
4617 || view
[*offset
+ 1] != (guard_reg
<< 4 | op
)
4618 // Disallow negative size.
4619 || view
[*offset
+ 2] & 0x80)
4621 *arg
= elfcpp::Swap
<16, true>::readval(view
+ *offset
+ 2);
4628 Target_s390
<size
>::ss_match_alfi(unsigned char* view
,
4629 section_size_type view_size
,
4630 section_offset_type
*offset
,
4632 uint32_t *arg
) const
4634 int op
= size
== 32 ? 0xb : 0xa;
4635 // al[g]fi %guard_reg, <arg>
4636 if (convert_to_section_size_type(*offset
+ 6) > view_size
4637 || view
[*offset
] != 0xc2
4638 || view
[*offset
+ 1] != (guard_reg
<< 4 | op
))
4640 *arg
= elfcpp::Swap
<32, true>::readval(view
+ *offset
+ 2);
4647 Target_s390
<32>::ss_match_cr(unsigned char* view
,
4648 section_size_type view_size
,
4649 section_offset_type
*offset
,
4650 int guard_reg
) const
4652 // cr %r15, %guard_reg
4653 if (convert_to_section_size_type(*offset
+ 2) > view_size
4654 || view
[*offset
] != 0x19
4655 || view
[*offset
+ 1] != (0xf0 | guard_reg
))
4663 Target_s390
<64>::ss_match_cr(unsigned char* view
,
4664 section_size_type view_size
,
4665 section_offset_type
*offset
,
4666 int guard_reg
) const
4668 // cgr %r15, %guard_reg
4669 if (convert_to_section_size_type(*offset
+ 4) > view_size
4670 || view
[*offset
] != 0xb9
4671 || view
[*offset
+ 1] != 0x20
4672 || view
[*offset
+ 2] != 0x00
4673 || view
[*offset
+ 3] != (0xf0 | guard_reg
))
4680 // FNOFFSET in section SHNDX in OBJECT is the start of a function
4681 // compiled with -fsplit-stack. The function calls non-split-stack
4682 // code. We have to change the function so that it always ensures
4683 // that it has enough stack space to run some random function.
4687 Target_s390
<size
>::do_calls_non_split(Relobj
* object
, unsigned int shndx
,
4688 section_offset_type fnoffset
,
4690 const unsigned char *prelocs
,
4692 unsigned char* view
,
4693 section_size_type view_size
,
4697 // true if there's a conditional call to __morestack in the function,
4698 // false if there's an unconditional one.
4699 bool conditional
= false;
4700 // Offset of the byte after the compare insn, if conditional.
4701 section_offset_type cmpend
= 0;
4702 // Type and immediate offset of the add instruction that adds frame size
4708 } fsadd_type
= SS_ADD_NONE
;
4709 section_offset_type fsadd_offset
= 0;
4710 uint32_t fsadd_frame_size
= 0;
4711 // Register used for loading guard. Usually r1, but can also be r0 or r2-r5.
4713 // Offset of the conditional jump.
4714 section_offset_type jump_offset
= 0;
4715 // Section view and offset of param block.
4716 section_offset_type param_offset
= 0;
4717 unsigned char *param_view
= 0;
4718 section_size_type param_view_size
= 0;
4719 // Current position in function.
4720 section_offset_type curoffset
= fnoffset
;
4721 // And the position of split-stack prologue.
4722 section_offset_type ssoffset
;
4724 typename
elfcpp::Elf_types
<size
>::Elf_Addr frame_size
;
4725 // Relocation parsing.
4726 typedef typename Reloc_types
<elfcpp::SHT_RELA
, size
, true>::Reloc Reltype
;
4727 const int reloc_size
= Reloc_types
<elfcpp::SHT_RELA
, size
, true>::reloc_size
;
4728 const unsigned char *pr
= prelocs
;
4730 // If the function was compiled with -pg, the profiling code may come before
4731 // the split-stack prologue. Skip it.
4733 this->ss_match_mcount(view
, view_size
, &curoffset
);
4734 ssoffset
= curoffset
;
4736 // First, figure out if there's a conditional call by looking for the
4737 // extract-tp, add, cmp sequence.
4739 if (this->ss_match_ear(view
, view_size
, &curoffset
))
4741 // Found extract-tp, now look for an add and compare.
4743 if (this->ss_match_c(view
, view_size
, &curoffset
))
4745 // Found a direct compare of stack pointer with the guard,
4748 else if (this->ss_match_l(view
, view_size
, &curoffset
, &guard_reg
))
4750 // Found a load of guard to register, look for an add and compare.
4751 if (this->ss_match_ahi(view
, view_size
, &curoffset
, guard_reg
,
4754 fsadd_type
= SS_ADD_AHI
;
4755 fsadd_offset
= curoffset
- 2;
4757 else if (this->ss_match_alfi(view
, view_size
, &curoffset
, guard_reg
,
4760 fsadd_type
= SS_ADD_ALFI
;
4761 fsadd_offset
= curoffset
- 4;
4767 // Now, there has to be a compare.
4768 if (!this->ss_match_cr(view
, view_size
, &curoffset
, guard_reg
))
4778 // Second, look for the call.
4779 if (!this->match_view_u(view
, view_size
, curoffset
, ss_code_larl
,
4780 sizeof ss_code_larl
))
4782 curoffset
+= sizeof ss_code_larl
;
4784 // Find out larl's operand. It should be a local symbol in .rodata
4786 for (size_t i
= 0; i
< reloc_count
; ++i
, pr
+= reloc_size
)
4789 if (static_cast<section_offset_type
>(reloc
.get_r_offset())
4792 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
4793 = reloc
.get_r_info();
4794 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
4795 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
4796 if (r_type
!= elfcpp::R_390_PC32DBL
)
4798 if (r_sym
>= object
->local_symbol_count())
4800 Sized_relobj_file
<size
, true> *object_sized
=
4801 static_cast<Sized_relobj_file
<size
, true> *>(object
);
4802 const Symbol_value
<size
>* sym
= object_sized
->local_symbol(r_sym
);
4803 bool param_shndx_ordinary
;
4804 const unsigned int param_shndx
=
4805 sym
->input_shndx(¶m_shndx_ordinary
);
4806 if (!param_shndx_ordinary
)
4808 param_offset
= sym
->input_value() + reloc
.get_r_addend() - 2
4809 - object
->output_section(param_shndx
)->address()
4810 - object
->output_section_offset(param_shndx
);
4811 param_view
= object
->get_output_view(param_shndx
,
4822 // Now, there has to be a jump to __morestack.
4823 jump_offset
= curoffset
;
4825 if (this->match_view_u(view
, view_size
, curoffset
,
4826 conditional
? ss_code_jgl
: ss_code_jg
,
4828 curoffset
+= sizeof ss_code_jg
;
4834 // Read the frame size.
4835 if (convert_to_section_size_type(param_offset
+ size
/ 8) > param_view_size
)
4837 frame_size
= elfcpp::Swap
<size
, true>::readval(param_view
+ param_offset
);
4840 if (fsadd_type
!= SS_ADD_NONE
&& fsadd_frame_size
!= frame_size
)
4843 // Bump the frame size.
4844 frame_size
+= parameters
->options().split_stack_adjust_size();
4846 // Store it to the param block.
4847 elfcpp::Swap
<size
, true>::writeval(param_view
+ param_offset
, frame_size
);
4851 // If the call was already unconditional, we're done.
4853 else if (frame_size
<= 0xffffffff && fsadd_type
== SS_ADD_ALFI
)
4855 // Using alfi to add the frame size, and it still fits. Adjust it.
4856 elfcpp::Swap_unaligned
<32, true>::writeval(view
+ fsadd_offset
,
4861 // We were either relying on the backoff area, or used ahi to load
4862 // frame size. This won't fly, as our new frame size is too large.
4863 // Convert the sequence to unconditional by nopping out the comparison,
4864 // and rewiring the jump.
4865 this->set_view_to_nop(view
, view_size
, ssoffset
, cmpend
- ssoffset
);
4867 // The jump is jgl, we'll mutate it to jg.
4868 view
[jump_offset
+1] = 0xf4;
4874 if (!object
->has_no_split_stack())
4875 object
->error(_("failed to match split-stack sequence at "
4876 "section %u offset %0zx"),
4877 shndx
, static_cast<size_t>(fnoffset
));
4880 // Relocate section data.
4884 Target_s390
<size
>::relocate_section(
4885 const Relocate_info
<size
, true>* relinfo
,
4886 unsigned int sh_type
,
4887 const unsigned char* prelocs
,
4889 Output_section
* output_section
,
4890 bool needs_special_offset_handling
,
4891 unsigned char* view
,
4892 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
4893 section_size_type view_size
,
4894 const Reloc_symbol_changes
* reloc_symbol_changes
)
4896 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, true>
4899 gold_assert(sh_type
== elfcpp::SHT_RELA
);
4901 gold::relocate_section
<size
, true, Target_s390
<size
>, Relocate
,
4902 gold::Default_comdat_behavior
, Classify_reloc
>(
4908 needs_special_offset_handling
,
4912 reloc_symbol_changes
);
4915 // Apply an incremental relocation. Incremental relocations always refer
4916 // to global symbols.
4920 Target_s390
<size
>::apply_relocation(
4921 const Relocate_info
<size
, true>* relinfo
,
4922 typename
elfcpp::Elf_types
<size
>::Elf_Addr r_offset
,
4923 unsigned int r_type
,
4924 typename
elfcpp::Elf_types
<size
>::Elf_Swxword r_addend
,
4926 unsigned char* view
,
4927 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
4928 section_size_type view_size
)
4930 gold::apply_relocation
<size
, true, Target_s390
<size
>,
4931 typename Target_s390
<size
>::Relocate
>(
4943 // The selector for s390 object files.
4946 class Target_selector_s390
: public Target_selector
4949 Target_selector_s390()
4950 : Target_selector(elfcpp::EM_S390
, size
, true,
4951 (size
== 64 ? "elf64-s390" : "elf32-s390"),
4952 (size
== 64 ? "elf64_s390" : "elf32_s390"))
4956 do_instantiate_target()
4957 { return new Target_s390
<size
>(); }
4960 Target_selector_s390
<32> target_selector_s390
;
4961 Target_selector_s390
<64> target_selector_s390x
;
4963 } // End anonymous namespace.