1 // powerpc.cc -- powerpc target support for gold.
3 // Copyright 2008, 2009 Free Software Foundation, Inc.
4 // Written by David S. Miller <davem@davemloft.net>
5 // and David Edelsohn <edelsohn@gnu.org>
7 // This file is part of gold.
9 // This program is free software; you can redistribute it and/or modify
10 // it under the terms of the GNU General Public License as published by
11 // the Free Software Foundation; either version 3 of the License, or
12 // (at your option) any later version.
14 // This program is distributed in the hope that it will be useful,
15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 // GNU General Public License for more details.
19 // You should have received a copy of the GNU General Public License
20 // along with this program; if not, write to the Free Software
21 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 // MA 02110-1301, USA.
27 #include "parameters.h"
34 #include "copy-relocs.h"
36 #include "target-reloc.h"
37 #include "target-select.h"
47 template<int size
, bool big_endian
>
48 class Output_data_plt_powerpc
;
50 template<int size
, bool big_endian
>
51 class Target_powerpc
: public Sized_target
<size
, big_endian
>
54 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
> Reloc_section
;
57 : Sized_target
<size
, big_endian
>(&powerpc_info
),
58 got_(NULL
), got2_(NULL
), toc_(NULL
),
59 plt_(NULL
), rela_dyn_(NULL
),
60 copy_relocs_(elfcpp::R_POWERPC_COPY
),
61 dynbss_(NULL
), got_mod_index_offset_(-1U)
65 // Process the relocations to determine unreferenced sections for
66 // garbage collection.
68 gc_process_relocs(Symbol_table
* symtab
,
70 Sized_relobj
<size
, big_endian
>* object
,
71 unsigned int data_shndx
,
73 const unsigned char* prelocs
,
75 Output_section
* output_section
,
76 bool needs_special_offset_handling
,
77 size_t local_symbol_count
,
78 const unsigned char* plocal_symbols
);
80 // Scan the relocations to look for symbol adjustments.
82 scan_relocs(Symbol_table
* symtab
,
84 Sized_relobj
<size
, big_endian
>* object
,
85 unsigned int data_shndx
,
87 const unsigned char* prelocs
,
89 Output_section
* output_section
,
90 bool needs_special_offset_handling
,
91 size_t local_symbol_count
,
92 const unsigned char* plocal_symbols
);
93 // Finalize the sections.
95 do_finalize_sections(Layout
*, const Input_objects
*, Symbol_table
*);
97 // Return the value to use for a dynamic which requires special
100 do_dynsym_value(const Symbol
*) const;
102 // Relocate a section.
104 relocate_section(const Relocate_info
<size
, big_endian
>*,
105 unsigned int sh_type
,
106 const unsigned char* prelocs
,
108 Output_section
* output_section
,
109 bool needs_special_offset_handling
,
111 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
112 section_size_type view_size
,
113 const Reloc_symbol_changes
*);
115 // Scan the relocs during a relocatable link.
117 scan_relocatable_relocs(Symbol_table
* symtab
,
119 Sized_relobj
<size
, big_endian
>* object
,
120 unsigned int data_shndx
,
121 unsigned int sh_type
,
122 const unsigned char* prelocs
,
124 Output_section
* output_section
,
125 bool needs_special_offset_handling
,
126 size_t local_symbol_count
,
127 const unsigned char* plocal_symbols
,
128 Relocatable_relocs
*);
130 // Relocate a section during a relocatable link.
132 relocate_for_relocatable(const Relocate_info
<size
, big_endian
>*,
133 unsigned int sh_type
,
134 const unsigned char* prelocs
,
136 Output_section
* output_section
,
137 off_t offset_in_output_section
,
138 const Relocatable_relocs
*,
140 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
141 section_size_type view_size
,
142 unsigned char* reloc_view
,
143 section_size_type reloc_view_size
);
145 // Return whether SYM is defined by the ABI.
147 do_is_defined_by_abi(const Symbol
* sym
) const
149 return strcmp(sym
->name(), "___tls_get_addr") == 0;
152 // Return the size of the GOT section.
156 gold_assert(this->got_
!= NULL
);
157 return this->got_
->data_size();
162 // The class which scans relocations.
167 : issued_non_pic_error_(false)
171 local(Symbol_table
* symtab
, Layout
* layout
, Target_powerpc
* target
,
172 Sized_relobj
<size
, big_endian
>* object
,
173 unsigned int data_shndx
,
174 Output_section
* output_section
,
175 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
176 const elfcpp::Sym
<size
, big_endian
>& lsym
);
179 global(Symbol_table
* symtab
, Layout
* layout
, Target_powerpc
* target
,
180 Sized_relobj
<size
, big_endian
>* object
,
181 unsigned int data_shndx
,
182 Output_section
* output_section
,
183 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
188 unsupported_reloc_local(Sized_relobj
<size
, big_endian
>*,
189 unsigned int r_type
);
192 unsupported_reloc_global(Sized_relobj
<size
, big_endian
>*,
193 unsigned int r_type
, Symbol
*);
196 generate_tls_call(Symbol_table
* symtab
, Layout
* layout
,
197 Target_powerpc
* target
);
200 check_non_pic(Relobj
*, unsigned int r_type
);
202 // Whether we have issued an error about a non-PIC compilation.
203 bool issued_non_pic_error_
;
206 // The class which implements relocation.
210 // Do a relocation. Return false if the caller should not issue
211 // any warnings about this relocation.
213 relocate(const Relocate_info
<size
, big_endian
>*, Target_powerpc
*,
214 Output_section
*, size_t relnum
,
215 const elfcpp::Rela
<size
, big_endian
>&,
216 unsigned int r_type
, const Sized_symbol
<size
>*,
217 const Symbol_value
<size
>*,
219 typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
223 // Do a TLS relocation.
225 relocate_tls(const Relocate_info
<size
, big_endian
>*,
226 Target_powerpc
* target
,
227 size_t relnum
, const elfcpp::Rela
<size
, big_endian
>&,
228 unsigned int r_type
, const Sized_symbol
<size
>*,
229 const Symbol_value
<size
>*,
231 typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
235 // A class which returns the size required for a relocation type,
236 // used while scanning relocs during a relocatable link.
237 class Relocatable_size_for_reloc
241 get_size_for_reloc(unsigned int, Relobj
*);
244 // Get the GOT section, creating it if necessary.
245 Output_data_got
<size
, big_endian
>*
246 got_section(Symbol_table
*, Layout
*);
251 gold_assert (this->got2_
!= NULL
);
255 // Get the TOC section.
259 gold_assert (this->toc_
!= NULL
);
263 // Create a PLT entry for a global symbol.
265 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
267 // Create a GOT entry for the TLS module index.
269 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
270 Sized_relobj
<size
, big_endian
>* object
);
272 // Get the PLT section.
273 const Output_data_plt_powerpc
<size
, big_endian
>*
276 gold_assert(this->plt_
!= NULL
);
280 // Get the dynamic reloc section, creating it if necessary.
282 rela_dyn_section(Layout
*);
284 // Copy a relocation against a global symbol.
286 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
287 Sized_relobj
<size
, big_endian
>* object
,
288 unsigned int shndx
, Output_section
* output_section
,
289 Symbol
* sym
, const elfcpp::Rela
<size
, big_endian
>& reloc
)
291 this->copy_relocs_
.copy_reloc(symtab
, layout
,
292 symtab
->get_sized_symbol
<size
>(sym
),
293 object
, shndx
, output_section
,
294 reloc
, this->rela_dyn_section(layout
));
297 // Information about this specific target which we pass to the
298 // general Target structure.
299 static Target::Target_info powerpc_info
;
301 // The types of GOT entries needed for this platform.
304 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
305 GOT_TYPE_TLS_OFFSET
= 1, // GOT entry for TLS offset
306 GOT_TYPE_TLS_PAIR
= 2, // GOT entry for TLS module/offset pair
310 Output_data_got
<size
, big_endian
>* got_
;
312 Output_data_space
* got2_
;
314 Output_data_space
* toc_
;
316 Output_data_plt_powerpc
<size
, big_endian
>* plt_
;
317 // The dynamic reloc section.
318 Reloc_section
* rela_dyn_
;
319 // Relocs saved to avoid a COPY reloc.
320 Copy_relocs
<elfcpp::SHT_RELA
, size
, big_endian
> copy_relocs_
;
321 // Space for variables copied with a COPY reloc.
322 Output_data_space
* dynbss_
;
323 // Offset of the GOT entry for the TLS module index;
324 unsigned int got_mod_index_offset_
;
328 Target::Target_info Target_powerpc
<32, true>::powerpc_info
=
331 true, // is_big_endian
332 elfcpp::EM_PPC
, // machine_code
333 false, // has_make_symbol
334 false, // has_resolve
335 false, // has_code_fill
336 true, // is_default_stack_executable
338 "/usr/lib/ld.so.1", // dynamic_linker
339 0x10000000, // default_text_segment_address
340 64 * 1024, // abi_pagesize (overridable by -z max-page-size)
341 4 * 1024, // common_pagesize (overridable by -z common-page-size)
342 elfcpp::SHN_UNDEF
, // small_common_shndx
343 elfcpp::SHN_UNDEF
, // large_common_shndx
344 0, // small_common_section_flags
345 0, // large_common_section_flags
346 NULL
, // attributes_section
347 NULL
// attributes_vendor
351 Target::Target_info Target_powerpc
<32, false>::powerpc_info
=
354 false, // is_big_endian
355 elfcpp::EM_PPC
, // machine_code
356 false, // has_make_symbol
357 false, // has_resolve
358 false, // has_code_fill
359 true, // is_default_stack_executable
361 "/usr/lib/ld.so.1", // dynamic_linker
362 0x10000000, // default_text_segment_address
363 64 * 1024, // abi_pagesize (overridable by -z max-page-size)
364 4 * 1024, // common_pagesize (overridable by -z common-page-size)
365 elfcpp::SHN_UNDEF
, // small_common_shndx
366 elfcpp::SHN_UNDEF
, // large_common_shndx
367 0, // small_common_section_flags
368 0, // large_common_section_flags
369 NULL
, // attributes_section
370 NULL
// attributes_vendor
374 Target::Target_info Target_powerpc
<64, true>::powerpc_info
=
377 true, // is_big_endian
378 elfcpp::EM_PPC64
, // machine_code
379 false, // has_make_symbol
380 false, // has_resolve
381 false, // has_code_fill
382 true, // is_default_stack_executable
384 "/usr/lib/ld.so.1", // dynamic_linker
385 0x10000000, // default_text_segment_address
386 64 * 1024, // abi_pagesize (overridable by -z max-page-size)
387 8 * 1024, // common_pagesize (overridable by -z common-page-size)
388 elfcpp::SHN_UNDEF
, // small_common_shndx
389 elfcpp::SHN_UNDEF
, // large_common_shndx
390 0, // small_common_section_flags
391 0, // large_common_section_flags
392 NULL
, // attributes_section
393 NULL
// attributes_vendor
397 Target::Target_info Target_powerpc
<64, false>::powerpc_info
=
400 false, // is_big_endian
401 elfcpp::EM_PPC64
, // machine_code
402 false, // has_make_symbol
403 false, // has_resolve
404 false, // has_code_fill
405 true, // is_default_stack_executable
407 "/usr/lib/ld.so.1", // dynamic_linker
408 0x10000000, // default_text_segment_address
409 64 * 1024, // abi_pagesize (overridable by -z max-page-size)
410 8 * 1024, // common_pagesize (overridable by -z common-page-size)
411 elfcpp::SHN_UNDEF
, // small_common_shndx
412 elfcpp::SHN_UNDEF
, // large_common_shndx
413 0, // small_common_section_flags
414 0, // large_common_section_flags
415 NULL
, // attributes_section
416 NULL
// attributes_vendor
419 template<int size
, bool big_endian
>
420 class Powerpc_relocate_functions
423 // Do a simple relocation with the addend in the relocation.
424 template<int valsize
>
426 rela(unsigned char* view
,
427 unsigned int right_shift
,
428 elfcpp::Elf_Xword dst_mask
,
429 typename
elfcpp::Swap
<size
, big_endian
>::Valtype value
,
430 typename
elfcpp::Swap
<size
, big_endian
>::Valtype addend
)
432 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
433 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
434 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
435 Valtype reloc
= ((value
+ addend
) >> right_shift
);
440 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
, val
| reloc
);
443 // Do a simple relocation using a symbol value with the addend in
445 template<int valsize
>
447 rela(unsigned char* view
,
448 unsigned int right_shift
,
449 elfcpp::Elf_Xword dst_mask
,
450 const Sized_relobj
<size
, big_endian
>* object
,
451 const Symbol_value
<size
>* psymval
,
452 typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype addend
)
454 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
455 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
456 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
457 Valtype reloc
= (psymval
->value(object
, addend
) >> right_shift
);
462 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
, val
| reloc
);
465 // Do a simple relocation using a symbol value with the addend in
466 // the relocation, unaligned.
467 template<int valsize
>
469 rela_ua(unsigned char* view
, unsigned int right_shift
,
470 elfcpp::Elf_Xword dst_mask
,
471 const Sized_relobj
<size
, big_endian
>* object
,
472 const Symbol_value
<size
>* psymval
,
473 typename
elfcpp::Swap
<size
, big_endian
>::Valtype addend
)
475 typedef typename
elfcpp::Swap_unaligned
<valsize
,
476 big_endian
>::Valtype Valtype
;
477 unsigned char* wv
= view
;
478 Valtype val
= elfcpp::Swap_unaligned
<valsize
, big_endian
>::readval(wv
);
479 Valtype reloc
= (psymval
->value(object
, addend
) >> right_shift
);
484 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(wv
, val
| reloc
);
487 // Do a simple PC relative relocation with a Symbol_value with the
488 // addend in the relocation.
489 template<int valsize
>
491 pcrela(unsigned char* view
, unsigned int right_shift
,
492 elfcpp::Elf_Xword dst_mask
,
493 const Sized_relobj
<size
, big_endian
>* object
,
494 const Symbol_value
<size
>* psymval
,
495 typename
elfcpp::Swap
<size
, big_endian
>::Valtype addend
,
496 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
498 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
499 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
500 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
501 Valtype reloc
= ((psymval
->value(object
, addend
) - address
)
507 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
, val
| reloc
);
510 template<int valsize
>
512 pcrela_unaligned(unsigned char* view
,
513 const Sized_relobj
<size
, big_endian
>* object
,
514 const Symbol_value
<size
>* psymval
,
515 typename
elfcpp::Swap
<size
, big_endian
>::Valtype addend
,
516 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
518 typedef typename
elfcpp::Swap_unaligned
<valsize
,
519 big_endian
>::Valtype Valtype
;
520 unsigned char* wv
= view
;
521 Valtype reloc
= (psymval
->value(object
, addend
) - address
);
523 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(wv
, reloc
);
526 typedef Powerpc_relocate_functions
<size
, big_endian
> This
;
527 typedef Relocate_functions
<size
, big_endian
> This_reloc
;
529 // R_POWERPC_REL32: (Symbol + Addend - Address)
531 rel32(unsigned char* view
,
532 const Sized_relobj
<size
, big_endian
>* object
,
533 const Symbol_value
<size
>* psymval
,
534 typename
elfcpp::Elf_types
<size
>::Elf_Addr addend
,
535 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
536 { This_reloc::pcrela32(view
, object
, psymval
, addend
, address
); }
538 // R_POWERPC_REL24: (Symbol + Addend - Address) & 0x3fffffc
540 rel24(unsigned char* view
,
541 const Sized_relobj
<size
, big_endian
>* object
,
542 const Symbol_value
<size
>* psymval
,
543 typename
elfcpp::Elf_types
<size
>::Elf_Addr addend
,
544 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
546 This::template pcrela
<32>(view
, 0, 0x03fffffc, object
,
547 psymval
, addend
, address
);
550 // R_POWERPC_REL14: (Symbol + Addend - Address) & 0xfffc
552 rel14(unsigned char* view
,
553 const Sized_relobj
<size
, big_endian
>* object
,
554 const Symbol_value
<size
>* psymval
,
555 typename
elfcpp::Elf_types
<size
>::Elf_Addr addend
,
556 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
558 This::template pcrela
<32>(view
, 0, 0x0000fffc, object
,
559 psymval
, addend
, address
);
562 // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff
564 addr16(unsigned char* view
,
565 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
566 typename
elfcpp::Elf_types
<size
>::Elf_Addr addend
)
567 { This_reloc::rela16(view
, value
, addend
); }
570 addr16(unsigned char* view
,
571 const Sized_relobj
<size
, big_endian
>* object
,
572 const Symbol_value
<size
>* psymval
,
573 typename
elfcpp::Elf_types
<size
>::Elf_Addr addend
)
574 { This_reloc::rela16(view
, object
, psymval
, addend
); }
576 // R_POWERPC_ADDR16_DS: (Symbol + Addend) & 0xfffc
578 addr16_ds(unsigned char* view
,
579 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
580 typename
elfcpp::Elf_types
<size
>::Elf_Addr addend
)
582 This::template rela
<16>(view
, 0, 0xfffc, value
, addend
);
585 // R_POWERPC_ADDR16_LO: (Symbol + Addend) & 0xffff
587 addr16_lo(unsigned char* view
,
588 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
589 typename
elfcpp::Elf_types
<size
>::Elf_Addr addend
)
590 { This_reloc::rela16(view
, value
, addend
); }
593 addr16_lo(unsigned char* view
,
594 const Sized_relobj
<size
, big_endian
>* object
,
595 const Symbol_value
<size
>* psymval
,
596 typename
elfcpp::Elf_types
<size
>::Elf_Addr addend
)
597 { This_reloc::rela16(view
, object
, psymval
, addend
); }
599 // R_POWERPC_ADDR16_HI: ((Symbol + Addend) >> 16) & 0xffff
601 addr16_hi(unsigned char* view
,
602 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
603 typename
elfcpp::Elf_types
<size
>::Elf_Addr addend
)
605 This::template rela
<16>(view
, 16, 0xffff, value
, addend
);
609 addr16_hi(unsigned char* view
,
610 const Sized_relobj
<size
, big_endian
>* object
,
611 const Symbol_value
<size
>* psymval
,
612 typename
elfcpp::Elf_types
<size
>::Elf_Addr addend
)
614 This::template rela
<16>(view
, 16, 0xffff, object
, psymval
, addend
);
617 // R_POWERPC_ADDR16_HA: Same as R_POWERPC_ADDR16_HI except that if the
618 // final value of the low 16 bits of the
619 // relocation is negative, add one.
621 addr16_ha(unsigned char* view
,
622 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
623 typename
elfcpp::Elf_types
<size
>::Elf_Addr addend
)
625 typename
elfcpp::Elf_types
<size
>::Elf_Addr reloc
;
627 reloc
= value
+ addend
;
633 elfcpp::Swap
<16, big_endian
>::writeval(view
, reloc
);
637 addr16_ha(unsigned char* view
,
638 const Sized_relobj
<size
, big_endian
>* object
,
639 const Symbol_value
<size
>* psymval
,
640 typename
elfcpp::Elf_types
<size
>::Elf_Addr addend
)
642 typename
elfcpp::Elf_types
<size
>::Elf_Addr reloc
;
644 reloc
= psymval
->value(object
, addend
);
650 elfcpp::Swap
<16, big_endian
>::writeval(view
, reloc
);
653 // R_PPC_REL16: (Symbol + Addend - Address) & 0xffff
655 rel16(unsigned char* view
,
656 const Sized_relobj
<size
, big_endian
>* object
,
657 const Symbol_value
<size
>* psymval
,
658 typename
elfcpp::Elf_types
<size
>::Elf_Addr addend
,
659 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
660 { This_reloc::pcrela16(view
, object
, psymval
, addend
, address
); }
662 // R_PPC_REL16_LO: (Symbol + Addend - Address) & 0xffff
664 rel16_lo(unsigned char* view
,
665 const Sized_relobj
<size
, big_endian
>* object
,
666 const Symbol_value
<size
>* psymval
,
667 typename
elfcpp::Elf_types
<size
>::Elf_Addr addend
,
668 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
669 { This_reloc::pcrela16(view
, object
, psymval
, addend
, address
); }
671 // R_PPC_REL16_HI: ((Symbol + Addend - Address) >> 16) & 0xffff
673 rel16_hi(unsigned char* view
,
674 const Sized_relobj
<size
, big_endian
>* object
,
675 const Symbol_value
<size
>* psymval
,
676 typename
elfcpp::Elf_types
<size
>::Elf_Addr addend
,
677 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
679 This::template pcrela
<16>(view
, 16, 0xffff, object
,
680 psymval
, addend
, address
);
683 // R_PPC_REL16_HA: Same as R_PPC_REL16_HI except that if the
684 // final value of the low 16 bits of the
685 // relocation is negative, add one.
687 rel16_ha(unsigned char* view
,
688 const Sized_relobj
<size
, big_endian
>* object
,
689 const Symbol_value
<size
>* psymval
,
690 typename
elfcpp::Elf_types
<size
>::Elf_Addr addend
,
691 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
693 typename
elfcpp::Elf_types
<size
>::Elf_Addr reloc
;
695 reloc
= (psymval
->value(object
, addend
) - address
);
700 elfcpp::Swap
<16, big_endian
>::writeval(view
, reloc
);
704 // Get the GOT section, creating it if necessary.
706 template<int size
, bool big_endian
>
707 Output_data_got
<size
, big_endian
>*
708 Target_powerpc
<size
, big_endian
>::got_section(Symbol_table
* symtab
,
711 if (this->got_
== NULL
)
713 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
715 this->got_
= new Output_data_got
<size
, big_endian
>();
717 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
718 elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
,
719 this->got_
, false, false, false, false);
721 // Create the GOT2 or TOC in the .got section.
724 this->got2_
= new Output_data_space(4, "** GOT2");
725 layout
->add_output_section_data(".got2", elfcpp::SHT_PROGBITS
,
728 this->got2_
, false, false, false,
733 this->toc_
= new Output_data_space(8, "** TOC");
734 layout
->add_output_section_data(".toc", elfcpp::SHT_PROGBITS
,
737 this->toc_
, false, false, false,
741 // Define _GLOBAL_OFFSET_TABLE_ at the start of the .got section.
742 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
743 Symbol_table::PREDEFINED
,
745 0, 0, elfcpp::STT_OBJECT
,
747 elfcpp::STV_HIDDEN
, 0,
754 // Get the dynamic reloc section, creating it if necessary.
756 template<int size
, bool big_endian
>
757 typename Target_powerpc
<size
, big_endian
>::Reloc_section
*
758 Target_powerpc
<size
, big_endian
>::rela_dyn_section(Layout
* layout
)
760 if (this->rela_dyn_
== NULL
)
762 gold_assert(layout
!= NULL
);
763 this->rela_dyn_
= new Reloc_section(parameters
->options().combreloc());
764 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
765 elfcpp::SHF_ALLOC
, this->rela_dyn_
, true,
766 false, false, false);
768 return this->rela_dyn_
;
771 // A class to handle the PLT data.
773 template<int size
, bool big_endian
>
774 class Output_data_plt_powerpc
: public Output_section_data
777 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true,
778 size
, big_endian
> Reloc_section
;
780 Output_data_plt_powerpc(Layout
*);
782 // Add an entry to the PLT.
783 void add_entry(Symbol
* gsym
);
785 // Return the .rela.plt section data.
786 const Reloc_section
* rel_plt() const
792 void do_adjust_output_section(Output_section
* os
);
795 // The size of an entry in the PLT.
796 static const int base_plt_entry_size
= (size
== 32 ? 16 : 24);
798 // Set the final size.
800 set_final_data_size()
802 unsigned int full_count
= this->count_
+ 4;
804 this->set_data_size(full_count
* base_plt_entry_size
);
807 // Write out the PLT data.
809 do_write(Output_file
*);
811 // The reloc section.
813 // The number of PLT entries.
817 // Create the PLT section. The ordinary .got section is an argument,
818 // since we need to refer to the start.
820 template<int size
, bool big_endian
>
821 Output_data_plt_powerpc
<size
, big_endian
>::Output_data_plt_powerpc(Layout
* layout
)
822 : Output_section_data(size
== 32 ? 4 : 8), count_(0)
824 this->rel_
= new Reloc_section(false);
825 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
826 elfcpp::SHF_ALLOC
, this->rel_
, true, false,
830 template<int size
, bool big_endian
>
832 Output_data_plt_powerpc
<size
, big_endian
>::do_adjust_output_section(Output_section
* os
)
837 // Add an entry to the PLT.
839 template<int size
, bool big_endian
>
841 Output_data_plt_powerpc
<size
, big_endian
>::add_entry(Symbol
* gsym
)
843 gold_assert(!gsym
->has_plt_offset());
844 unsigned int index
= this->count_
+ + 4;
845 section_offset_type plt_offset
;
848 plt_offset
= index
* base_plt_entry_size
;
852 gsym
->set_plt_offset(plt_offset
);
856 gsym
->set_needs_dynsym_entry();
857 this->rel_
->add_global(gsym
, elfcpp::R_POWERPC_JMP_SLOT
, this,
861 static const unsigned int addis_11_11
= 0x3d6b0000;
862 static const unsigned int addis_11_30
= 0x3d7e0000;
863 static const unsigned int addis_12_12
= 0x3d8c0000;
864 static const unsigned int addi_11_11
= 0x396b0000;
865 static const unsigned int add_0_11_11
= 0x7c0b5a14;
866 static const unsigned int add_11_0_11
= 0x7d605a14;
867 static const unsigned int b
= 0x48000000;
868 static const unsigned int bcl_20_31
= 0x429f0005;
869 static const unsigned int bctr
= 0x4e800420;
870 static const unsigned int lis_11
= 0x3d600000;
871 static const unsigned int lis_12
= 0x3d800000;
872 static const unsigned int lwzu_0_12
= 0x840c0000;
873 static const unsigned int lwz_0_12
= 0x800c0000;
874 static const unsigned int lwz_11_11
= 0x816b0000;
875 static const unsigned int lwz_11_30
= 0x817e0000;
876 static const unsigned int lwz_12_12
= 0x818c0000;
877 static const unsigned int mflr_0
= 0x7c0802a6;
878 static const unsigned int mflr_12
= 0x7d8802a6;
879 static const unsigned int mtctr_0
= 0x7c0903a6;
880 static const unsigned int mtctr_11
= 0x7d6903a6;
881 static const unsigned int mtlr_0
= 0x7c0803a6;
882 static const unsigned int nop
= 0x60000000;
883 static const unsigned int sub_11_11_12
= 0x7d6c5850;
885 static const unsigned int addis_r12_r2
= 0x3d820000; /* addis %r12,%r2,xxx@ha */
886 static const unsigned int std_r2_40r1
= 0xf8410028; /* std %r2,40(%r1) */
887 static const unsigned int ld_r11_0r12
= 0xe96c0000; /* ld %r11,xxx+0@l(%r12) */
888 static const unsigned int ld_r2_0r12
= 0xe84c0000; /* ld %r2,xxx+8@l(%r12) */
889 /* ld %r11,xxx+16@l(%r12) */
892 // Write out the PLT.
894 template<int size
, bool big_endian
>
896 Output_data_plt_powerpc
<size
, big_endian
>::do_write(Output_file
* of
)
898 const off_t offset
= this->offset();
899 const section_size_type oview_size
=
900 convert_to_section_size_type(this->data_size());
901 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
902 unsigned char* pov
= oview
;
904 memset(pov
, 0, base_plt_entry_size
* 4);
905 pov
+= base_plt_entry_size
* 4;
907 unsigned int plt_offset
= base_plt_entry_size
* 4;
908 const unsigned int count
= this->count_
;
912 for (unsigned int i
= 0; i
< count
; i
++)
918 for (unsigned int i
= 0; i
< count
; i
++)
920 elfcpp::Swap
<32, true>::writeval(pov
+ 0x00,
921 lwz_11_30
+ plt_offset
);
922 elfcpp::Swap
<32, true>::writeval(pov
+ 0x04, mtctr_11
);
923 elfcpp::Swap
<32, true>::writeval(pov
+ 0x08, bctr
);
924 elfcpp::Swap
<32, true>::writeval(pov
+ 0x0c, nop
);
925 pov
+= base_plt_entry_size
;
926 plt_offset
+= base_plt_entry_size
;
930 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
932 of
->write_output_view(offset
, oview_size
, oview
);
935 // Create a PLT entry for a global symbol.
937 template<int size
, bool big_endian
>
939 Target_powerpc
<size
, big_endian
>::make_plt_entry(Symbol_table
* symtab
,
943 if (gsym
->has_plt_offset())
946 if (this->plt_
== NULL
)
948 // Create the GOT section first.
949 this->got_section(symtab
, layout
);
951 // Ensure that .rela.dyn always appears before .rela.plt This is
952 // necessary due to how, on PowerPC and some other targets, .rela.dyn
953 // needs to include .rela.plt in it's range.
954 this->rela_dyn_section(layout
);
956 this->plt_
= new Output_data_plt_powerpc
<size
, big_endian
>(layout
);
957 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
959 | elfcpp::SHF_EXECINSTR
960 | elfcpp::SHF_WRITE
),
961 this->plt_
, false, false, false, false);
963 // Define _PROCEDURE_LINKAGE_TABLE_ at the start of the .plt section.
964 symtab
->define_in_output_data("_PROCEDURE_LINKAGE_TABLE_", NULL
,
965 Symbol_table::PREDEFINED
,
967 0, 0, elfcpp::STT_OBJECT
,
969 elfcpp::STV_HIDDEN
, 0,
973 this->plt_
->add_entry(gsym
);
976 // Create a GOT entry for the TLS module index.
978 template<int size
, bool big_endian
>
980 Target_powerpc
<size
, big_endian
>::got_mod_index_entry(Symbol_table
* symtab
,
982 Sized_relobj
<size
, big_endian
>* object
)
984 if (this->got_mod_index_offset_
== -1U)
986 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
987 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
988 Output_data_got
<size
, big_endian
>* got
;
989 unsigned int got_offset
;
991 got
= this->got_section(symtab
, layout
);
992 got_offset
= got
->add_constant(0);
993 rela_dyn
->add_local(object
, 0, elfcpp::R_POWERPC_DTPMOD
, got
,
995 got
->add_constant(0);
996 this->got_mod_index_offset_
= got_offset
;
998 return this->got_mod_index_offset_
;
1001 // Optimize the TLS relocation type based on what we know about the
1002 // symbol. IS_FINAL is true if the final address of this symbol is
1003 // known at link time.
1005 static tls::Tls_optimization
1006 optimize_tls_reloc(bool /* is_final */, int r_type
)
1008 // If we are generating a shared library, then we can't do anything
1010 if (parameters
->options().shared())
1011 return tls::TLSOPT_NONE
;
1020 // Report an unsupported relocation against a local symbol.
1022 template<int size
, bool big_endian
>
1024 Target_powerpc
<size
, big_endian
>::Scan::unsupported_reloc_local(
1025 Sized_relobj
<size
, big_endian
>* object
,
1026 unsigned int r_type
)
1028 gold_error(_("%s: unsupported reloc %u against local symbol"),
1029 object
->name().c_str(), r_type
);
1032 // We are about to emit a dynamic relocation of type R_TYPE. If the
1033 // dynamic linker does not support it, issue an error.
1035 template<int size
, bool big_endian
>
1037 Target_powerpc
<size
, big_endian
>::Scan::check_non_pic(Relobj
* object
,
1038 unsigned int r_type
)
1040 gold_assert(r_type
!= elfcpp::R_POWERPC_NONE
);
1042 // These are the relocation types supported by glibc for both 32-bit
1043 // and 64-bit powerpc.
1046 case elfcpp::R_POWERPC_RELATIVE
:
1047 case elfcpp::R_POWERPC_GLOB_DAT
:
1048 case elfcpp::R_POWERPC_DTPMOD
:
1049 case elfcpp::R_POWERPC_DTPREL
:
1050 case elfcpp::R_POWERPC_TPREL
:
1051 case elfcpp::R_POWERPC_JMP_SLOT
:
1052 case elfcpp::R_POWERPC_COPY
:
1053 case elfcpp::R_POWERPC_ADDR32
:
1054 case elfcpp::R_POWERPC_ADDR24
:
1055 case elfcpp::R_POWERPC_REL24
:
1066 // These are the relocation types supported only on 64-bit.
1067 case elfcpp::R_PPC64_ADDR64
:
1068 case elfcpp::R_PPC64_TPREL16_LO_DS
:
1069 case elfcpp::R_PPC64_TPREL16_DS
:
1070 case elfcpp::R_POWERPC_TPREL16
:
1071 case elfcpp::R_POWERPC_TPREL16_LO
:
1072 case elfcpp::R_POWERPC_TPREL16_HI
:
1073 case elfcpp::R_POWERPC_TPREL16_HA
:
1074 case elfcpp::R_PPC64_TPREL16_HIGHER
:
1075 case elfcpp::R_PPC64_TPREL16_HIGHEST
:
1076 case elfcpp::R_PPC64_TPREL16_HIGHERA
:
1077 case elfcpp::R_PPC64_TPREL16_HIGHESTA
:
1078 case elfcpp::R_PPC64_ADDR16_LO_DS
:
1079 case elfcpp::R_POWERPC_ADDR16_LO
:
1080 case elfcpp::R_POWERPC_ADDR16_HI
:
1081 case elfcpp::R_POWERPC_ADDR16_HA
:
1082 case elfcpp::R_POWERPC_ADDR30
:
1083 case elfcpp::R_PPC64_UADDR64
:
1084 case elfcpp::R_POWERPC_UADDR32
:
1085 case elfcpp::R_POWERPC_ADDR16
:
1086 case elfcpp::R_POWERPC_UADDR16
:
1087 case elfcpp::R_PPC64_ADDR16_DS
:
1088 case elfcpp::R_PPC64_ADDR16_HIGHER
:
1089 case elfcpp::R_PPC64_ADDR16_HIGHEST
:
1090 case elfcpp::R_PPC64_ADDR16_HIGHERA
:
1091 case elfcpp::R_PPC64_ADDR16_HIGHESTA
:
1092 case elfcpp::R_POWERPC_ADDR14_BRTAKEN
:
1093 case elfcpp::R_POWERPC_ADDR14_BRNTAKEN
:
1094 case elfcpp::R_POWERPC_REL32
:
1095 case elfcpp::R_PPC64_REL64
:
1106 // These are the relocation types supported only on 32-bit.
1113 // This prevents us from issuing more than one error per reloc
1114 // section. But we can still wind up issuing more than one
1115 // error per object file.
1116 if (this->issued_non_pic_error_
)
1118 gold_assert(parameters
->options().output_is_position_independent());
1119 object
->error(_("requires unsupported dynamic reloc; "
1120 "recompile with -fPIC"));
1121 this->issued_non_pic_error_
= true;
1125 // Scan a relocation for a local symbol.
1127 template<int size
, bool big_endian
>
1129 Target_powerpc
<size
, big_endian
>::Scan::local(
1130 Symbol_table
* symtab
,
1132 Target_powerpc
<size
, big_endian
>* target
,
1133 Sized_relobj
<size
, big_endian
>* object
,
1134 unsigned int data_shndx
,
1135 Output_section
* output_section
,
1136 const elfcpp::Rela
<size
, big_endian
>& reloc
,
1137 unsigned int r_type
,
1138 const elfcpp::Sym
<size
, big_endian
>& lsym
)
1142 case elfcpp::R_POWERPC_NONE
:
1143 case elfcpp::R_POWERPC_GNU_VTINHERIT
:
1144 case elfcpp::R_POWERPC_GNU_VTENTRY
:
1147 case elfcpp::R_PPC64_ADDR64
:
1148 case elfcpp::R_POWERPC_ADDR32
:
1149 case elfcpp::R_POWERPC_ADDR16_HA
:
1150 case elfcpp::R_POWERPC_ADDR16_LO
:
1151 // If building a shared library (or a position-independent
1152 // executable), we need to create a dynamic relocation for
1154 if (parameters
->options().output_is_position_independent())
1156 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1158 check_non_pic(object
, r_type
);
1159 if (lsym
.get_st_type() != elfcpp::STT_SECTION
)
1161 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
1162 rela_dyn
->add_local(object
, r_sym
, r_type
, output_section
,
1163 data_shndx
, reloc
.get_r_offset(),
1164 reloc
.get_r_addend());
1168 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
1169 gold_assert(lsym
.get_st_value() == 0);
1170 rela_dyn
->add_local_relative(object
, r_sym
, r_type
,
1171 output_section
, data_shndx
,
1172 reloc
.get_r_offset(),
1173 reloc
.get_r_addend());
1178 case elfcpp::R_POWERPC_REL24
:
1179 case elfcpp::R_PPC_LOCAL24PC
:
1180 case elfcpp::R_POWERPC_REL32
:
1181 case elfcpp::R_PPC_REL16_LO
:
1182 case elfcpp::R_PPC_REL16_HA
:
1185 case elfcpp::R_POWERPC_GOT16
:
1186 case elfcpp::R_POWERPC_GOT16_LO
:
1187 case elfcpp::R_POWERPC_GOT16_HI
:
1188 case elfcpp::R_POWERPC_GOT16_HA
:
1189 case elfcpp::R_PPC64_TOC16
:
1190 case elfcpp::R_PPC64_TOC16_LO
:
1191 case elfcpp::R_PPC64_TOC16_HI
:
1192 case elfcpp::R_PPC64_TOC16_HA
:
1193 case elfcpp::R_PPC64_TOC16_DS
:
1194 case elfcpp::R_PPC64_TOC16_LO_DS
:
1196 // The symbol requires a GOT entry.
1197 Output_data_got
<size
, big_endian
>* got
;
1200 got
= target
->got_section(symtab
, layout
);
1201 r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
1203 // If we are generating a shared object, we need to add a
1204 // dynamic relocation for this symbol's GOT entry.
1205 if (parameters
->options().output_is_position_independent())
1207 if (!object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
))
1209 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1212 off
= got
->add_constant(0);
1213 object
->set_local_got_offset(r_sym
, GOT_TYPE_STANDARD
, off
);
1214 rela_dyn
->add_local_relative(object
, r_sym
,
1215 elfcpp::R_POWERPC_RELATIVE
,
1220 got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
);
1224 case elfcpp::R_PPC64_TOC
:
1225 // We need a GOT section.
1226 target
->got_section(symtab
, layout
);
1229 // These are relocations which should only be seen by the
1230 // dynamic linker, and should never be seen here.
1231 case elfcpp::R_POWERPC_COPY
:
1232 case elfcpp::R_POWERPC_GLOB_DAT
:
1233 case elfcpp::R_POWERPC_JMP_SLOT
:
1234 case elfcpp::R_POWERPC_RELATIVE
:
1235 case elfcpp::R_POWERPC_DTPMOD
:
1236 gold_error(_("%s: unexpected reloc %u in object file"),
1237 object
->name().c_str(), r_type
);
1241 unsupported_reloc_local(object
, r_type
);
1246 // Report an unsupported relocation against a global symbol.
1248 template<int size
, bool big_endian
>
1250 Target_powerpc
<size
, big_endian
>::Scan::unsupported_reloc_global(
1251 Sized_relobj
<size
, big_endian
>* object
,
1252 unsigned int r_type
,
1255 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1256 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
1259 // Scan a relocation for a global symbol.
1261 template<int size
, bool big_endian
>
1263 Target_powerpc
<size
, big_endian
>::Scan::global(
1264 Symbol_table
* symtab
,
1266 Target_powerpc
<size
, big_endian
>* target
,
1267 Sized_relobj
<size
, big_endian
>* object
,
1268 unsigned int data_shndx
,
1269 Output_section
* output_section
,
1270 const elfcpp::Rela
<size
, big_endian
>& reloc
,
1271 unsigned int r_type
,
1276 case elfcpp::R_POWERPC_NONE
:
1277 case elfcpp::R_POWERPC_GNU_VTINHERIT
:
1278 case elfcpp::R_POWERPC_GNU_VTENTRY
:
1281 case elfcpp::R_PPC_PLTREL24
:
1282 // If the symbol is fully resolved, this is just a PC32 reloc.
1283 // Otherwise we need a PLT entry.
1284 if (gsym
->final_value_is_known())
1286 // If building a shared library, we can also skip the PLT entry
1287 // if the symbol is defined in the output file and is protected
1289 if (gsym
->is_defined()
1290 && !gsym
->is_from_dynobj()
1291 && !gsym
->is_preemptible())
1293 target
->make_plt_entry(symtab
, layout
, gsym
);
1296 case elfcpp::R_POWERPC_ADDR16
:
1297 case elfcpp::R_POWERPC_ADDR16_LO
:
1298 case elfcpp::R_POWERPC_ADDR16_HI
:
1299 case elfcpp::R_POWERPC_ADDR16_HA
:
1300 case elfcpp::R_POWERPC_ADDR32
:
1301 case elfcpp::R_PPC64_ADDR64
:
1303 // Make a PLT entry if necessary.
1304 if (gsym
->needs_plt_entry())
1306 target
->make_plt_entry(symtab
, layout
, gsym
);
1307 // Since this is not a PC-relative relocation, we may be
1308 // taking the address of a function. In that case we need to
1309 // set the entry in the dynamic symbol table to the address of
1311 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
1312 gsym
->set_needs_dynsym_value();
1314 // Make a dynamic relocation if necessary.
1315 if (gsym
->needs_dynamic_reloc(Symbol::ABSOLUTE_REF
))
1317 if (gsym
->may_need_copy_reloc())
1319 target
->copy_reloc(symtab
, layout
, object
,
1320 data_shndx
, output_section
, gsym
, reloc
);
1322 else if ((r_type
== elfcpp::R_POWERPC_ADDR32
1323 || r_type
== elfcpp::R_PPC64_ADDR64
)
1324 && gsym
->can_use_relative_reloc(false))
1326 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1327 rela_dyn
->add_global_relative(gsym
, elfcpp::R_POWERPC_RELATIVE
,
1328 output_section
, object
,
1329 data_shndx
, reloc
.get_r_offset(),
1330 reloc
.get_r_addend());
1334 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1336 check_non_pic(object
, r_type
);
1337 if (gsym
->is_from_dynobj()
1338 || gsym
->is_undefined()
1339 || gsym
->is_preemptible())
1340 rela_dyn
->add_global(gsym
, r_type
, output_section
,
1342 reloc
.get_r_offset(),
1343 reloc
.get_r_addend());
1345 rela_dyn
->add_global_relative(gsym
, r_type
,
1346 output_section
, object
,
1348 reloc
.get_r_offset(),
1349 reloc
.get_r_addend());
1355 case elfcpp::R_POWERPC_REL24
:
1356 case elfcpp::R_PPC_LOCAL24PC
:
1357 case elfcpp::R_PPC_REL16
:
1358 case elfcpp::R_PPC_REL16_LO
:
1359 case elfcpp::R_PPC_REL16_HI
:
1360 case elfcpp::R_PPC_REL16_HA
:
1362 if (gsym
->needs_plt_entry())
1363 target
->make_plt_entry(symtab
, layout
, gsym
);
1364 // Make a dynamic relocation if necessary.
1365 int flags
= Symbol::NON_PIC_REF
;
1366 if (gsym
->type() == elfcpp::STT_FUNC
)
1367 flags
|= Symbol::FUNCTION_CALL
;
1368 if (gsym
->needs_dynamic_reloc(flags
))
1370 if (gsym
->may_need_copy_reloc())
1372 target
->copy_reloc(symtab
, layout
, object
,
1373 data_shndx
, output_section
, gsym
,
1378 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1379 check_non_pic(object
, r_type
);
1380 rela_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1381 data_shndx
, reloc
.get_r_offset(),
1382 reloc
.get_r_addend());
1388 case elfcpp::R_POWERPC_GOT16
:
1389 case elfcpp::R_POWERPC_GOT16_LO
:
1390 case elfcpp::R_POWERPC_GOT16_HI
:
1391 case elfcpp::R_POWERPC_GOT16_HA
:
1392 case elfcpp::R_PPC64_TOC16
:
1393 case elfcpp::R_PPC64_TOC16_LO
:
1394 case elfcpp::R_PPC64_TOC16_HI
:
1395 case elfcpp::R_PPC64_TOC16_HA
:
1396 case elfcpp::R_PPC64_TOC16_DS
:
1397 case elfcpp::R_PPC64_TOC16_LO_DS
:
1399 // The symbol requires a GOT entry.
1400 Output_data_got
<size
, big_endian
>* got
;
1402 got
= target
->got_section(symtab
, layout
);
1403 if (gsym
->final_value_is_known())
1404 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
1407 // If this symbol is not fully resolved, we need to add a
1408 // dynamic relocation for it.
1409 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1410 if (gsym
->is_from_dynobj()
1411 || gsym
->is_undefined()
1412 || gsym
->is_preemptible())
1413 got
->add_global_with_rela(gsym
, GOT_TYPE_STANDARD
, rela_dyn
,
1414 elfcpp::R_POWERPC_GLOB_DAT
);
1415 else if (!gsym
->has_got_offset(GOT_TYPE_STANDARD
))
1417 unsigned int off
= got
->add_constant(0);
1419 gsym
->set_got_offset(GOT_TYPE_STANDARD
, off
);
1420 rela_dyn
->add_global_relative(gsym
, elfcpp::R_POWERPC_RELATIVE
,
1427 case elfcpp::R_PPC64_TOC
:
1428 // We need a GOT section.
1429 target
->got_section(symtab
, layout
);
1432 case elfcpp::R_POWERPC_GOT_TPREL16
:
1433 case elfcpp::R_POWERPC_TLS
:
1437 // These are relocations which should only be seen by the
1438 // dynamic linker, and should never be seen here.
1439 case elfcpp::R_POWERPC_COPY
:
1440 case elfcpp::R_POWERPC_GLOB_DAT
:
1441 case elfcpp::R_POWERPC_JMP_SLOT
:
1442 case elfcpp::R_POWERPC_RELATIVE
:
1443 case elfcpp::R_POWERPC_DTPMOD
:
1444 gold_error(_("%s: unexpected reloc %u in object file"),
1445 object
->name().c_str(), r_type
);
1449 unsupported_reloc_global(object
, r_type
, gsym
);
1454 // Process relocations for gc.
1456 template<int size
, bool big_endian
>
1458 Target_powerpc
<size
, big_endian
>::gc_process_relocs(
1459 Symbol_table
* symtab
,
1461 Sized_relobj
<size
, big_endian
>* object
,
1462 unsigned int data_shndx
,
1464 const unsigned char* prelocs
,
1466 Output_section
* output_section
,
1467 bool needs_special_offset_handling
,
1468 size_t local_symbol_count
,
1469 const unsigned char* plocal_symbols
)
1471 typedef Target_powerpc
<size
, big_endian
> Powerpc
;
1472 typedef typename Target_powerpc
<size
, big_endian
>::Scan Scan
;
1474 gold::gc_process_relocs
<size
, big_endian
, Powerpc
, elfcpp::SHT_RELA
, Scan
>(
1483 needs_special_offset_handling
,
1488 // Scan relocations for a section.
1490 template<int size
, bool big_endian
>
1492 Target_powerpc
<size
, big_endian
>::scan_relocs(
1493 Symbol_table
* symtab
,
1495 Sized_relobj
<size
, big_endian
>* object
,
1496 unsigned int data_shndx
,
1497 unsigned int sh_type
,
1498 const unsigned char* prelocs
,
1500 Output_section
* output_section
,
1501 bool needs_special_offset_handling
,
1502 size_t local_symbol_count
,
1503 const unsigned char* plocal_symbols
)
1505 typedef Target_powerpc
<size
, big_endian
> Powerpc
;
1506 typedef typename Target_powerpc
<size
, big_endian
>::Scan Scan
;
1507 static Output_data_space
* sdata
;
1509 if (sh_type
== elfcpp::SHT_REL
)
1511 gold_error(_("%s: unsupported REL reloc section"),
1512 object
->name().c_str());
1516 // Define _SDA_BASE_ at the start of the .sdata section.
1519 // layout->find_output_section(".sdata") == NULL
1520 sdata
= new Output_data_space(4, "** sdata");
1521 Output_section
* os
= layout
->add_output_section_data(".sdata", 0,
1523 | elfcpp::SHF_WRITE
,
1525 false, false, false);
1526 symtab
->define_in_output_data("_SDA_BASE_", NULL
,
1527 Symbol_table::PREDEFINED
,
1532 elfcpp::STV_HIDDEN
, 0,
1536 gold::scan_relocs
<size
, big_endian
, Powerpc
, elfcpp::SHT_RELA
, Scan
>(
1545 needs_special_offset_handling
,
1550 // Finalize the sections.
1552 template<int size
, bool big_endian
>
1554 Target_powerpc
<size
, big_endian
>::do_finalize_sections(
1556 const Input_objects
*,
1559 // Fill in some more dynamic tags.
1560 const Reloc_section
* rel_plt
= (this->plt_
== NULL
1562 : this->plt_
->rel_plt());
1563 layout
->add_target_dynamic_tags(false, this->plt_
, rel_plt
,
1564 this->rela_dyn_
, true, size
== 32);
1566 // Emit any relocs we saved in an attempt to avoid generating COPY
1568 if (this->copy_relocs_
.any_saved_relocs())
1569 this->copy_relocs_
.emit(this->rela_dyn_section(layout
));
1572 // Perform a relocation.
1574 template<int size
, bool big_endian
>
1576 Target_powerpc
<size
, big_endian
>::Relocate::relocate(
1577 const Relocate_info
<size
, big_endian
>* relinfo
,
1578 Target_powerpc
* target
,
1581 const elfcpp::Rela
<size
, big_endian
>& rela
,
1582 unsigned int r_type
,
1583 const Sized_symbol
<size
>* gsym
,
1584 const Symbol_value
<size
>* psymval
,
1585 unsigned char* view
,
1586 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
1587 section_size_type
/* view_size */)
1589 const unsigned int toc_base_offset
= 0x8000;
1590 typedef Powerpc_relocate_functions
<size
, big_endian
> Reloc
;
1592 // Pick the value to use for symbols defined in shared objects.
1593 Symbol_value
<size
> symval
;
1595 && gsym
->use_plt_offset(r_type
== elfcpp::R_POWERPC_REL24
1596 || r_type
== elfcpp::R_PPC_LOCAL24PC
1597 || r_type
== elfcpp::R_PPC_REL16
1598 || r_type
== elfcpp::R_PPC_REL16_LO
1599 || r_type
== elfcpp::R_PPC_REL16_HI
1600 || r_type
== elfcpp::R_PPC_REL16_HA
))
1602 elfcpp::Elf_Xword value
;
1604 value
= target
->plt_section()->address() + gsym
->plt_offset();
1606 symval
.set_output_value(value
);
1611 const Sized_relobj
<size
, big_endian
>* object
= relinfo
->object
;
1612 elfcpp::Elf_Xword addend
= rela
.get_r_addend();
1614 // Get the GOT offset if needed. Unlike i386 and x86_64, our GOT
1615 // pointer points to the beginning, not the end, of the table.
1616 // So we just use the plain offset.
1617 bool have_got_offset
= false;
1618 unsigned int got_offset
= 0;
1619 unsigned int got2_offset
= 0;
1622 case elfcpp::R_PPC64_TOC16
:
1623 case elfcpp::R_PPC64_TOC16_LO
:
1624 case elfcpp::R_PPC64_TOC16_HI
:
1625 case elfcpp::R_PPC64_TOC16_HA
:
1626 case elfcpp::R_PPC64_TOC16_DS
:
1627 case elfcpp::R_PPC64_TOC16_LO_DS
:
1628 // Subtract the TOC base address.
1629 addend
-= target
->toc_section()->address() + toc_base_offset
;
1632 case elfcpp::R_POWERPC_GOT16
:
1633 case elfcpp::R_POWERPC_GOT16_LO
:
1634 case elfcpp::R_POWERPC_GOT16_HI
:
1635 case elfcpp::R_POWERPC_GOT16_HA
:
1636 case elfcpp::R_PPC64_GOT16_DS
:
1637 case elfcpp::R_PPC64_GOT16_LO_DS
:
1640 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
1641 got_offset
= gsym
->got_offset(GOT_TYPE_STANDARD
);
1645 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
1646 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
1647 got_offset
= object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
);
1649 have_got_offset
= true;
1652 // R_PPC_PLTREL24 is rather special. If non-zero,
1653 // the addend specifies the GOT pointer offset within .got2.
1654 case elfcpp::R_PPC_PLTREL24
:
1655 if (addend
>= 32768)
1657 Output_data_space
* got2
;
1658 got2
= target
->got2_section();
1659 got2_offset
= got2
->offset();
1660 addend
+= got2_offset
;
1662 have_got_offset
= true;
1671 case elfcpp::R_POWERPC_NONE
:
1672 case elfcpp::R_POWERPC_GNU_VTINHERIT
:
1673 case elfcpp::R_POWERPC_GNU_VTENTRY
:
1676 case elfcpp::R_POWERPC_REL32
:
1677 Reloc::rel32(view
, object
, psymval
, addend
, address
);
1680 case elfcpp::R_POWERPC_REL24
:
1681 Reloc::rel24(view
, object
, psymval
, addend
, address
);
1684 case elfcpp::R_POWERPC_REL14
:
1685 Reloc::rel14(view
, object
, psymval
, addend
, address
);
1688 case elfcpp::R_PPC_PLTREL24
:
1689 Reloc::rel24(view
, object
, psymval
, addend
, address
);
1692 case elfcpp::R_PPC_LOCAL24PC
:
1693 Reloc::rel24(view
, object
, psymval
, addend
, address
);
1696 case elfcpp::R_PPC64_ADDR64
:
1697 if (!parameters
->options().output_is_position_independent())
1698 Relocate_functions
<size
, big_endian
>::rela64(view
, object
,
1702 case elfcpp::R_POWERPC_ADDR32
:
1703 if (!parameters
->options().output_is_position_independent())
1704 Relocate_functions
<size
, big_endian
>::rela32(view
, object
,
1708 case elfcpp::R_POWERPC_ADDR16_LO
:
1709 Reloc::addr16_lo(view
, object
, psymval
, addend
);
1712 case elfcpp::R_POWERPC_ADDR16_HI
:
1713 Reloc::addr16_hi(view
, object
, psymval
, addend
);
1716 case elfcpp::R_POWERPC_ADDR16_HA
:
1717 Reloc::addr16_ha(view
, object
, psymval
, addend
);
1720 case elfcpp::R_PPC_REL16_LO
:
1721 Reloc::rel16_lo(view
, object
, psymval
, addend
, address
);
1724 case elfcpp::R_PPC_REL16_HI
:
1725 Reloc::rel16_lo(view
, object
, psymval
, addend
, address
);
1728 case elfcpp::R_PPC_REL16_HA
:
1729 Reloc::rel16_ha(view
, object
, psymval
, addend
, address
);
1732 case elfcpp::R_POWERPC_GOT16
:
1733 Reloc::addr16(view
, got_offset
, addend
);
1736 case elfcpp::R_POWERPC_GOT16_LO
:
1737 Reloc::addr16_lo(view
, got_offset
, addend
);
1740 case elfcpp::R_POWERPC_GOT16_HI
:
1741 Reloc::addr16_hi(view
, got_offset
, addend
);
1744 case elfcpp::R_POWERPC_GOT16_HA
:
1745 Reloc::addr16_ha(view
, got_offset
, addend
);
1748 case elfcpp::R_PPC64_TOC16
:
1749 Reloc::addr16(view
, got_offset
, addend
);
1752 case elfcpp::R_PPC64_TOC16_LO
:
1753 Reloc::addr16_lo(view
, got_offset
, addend
);
1756 case elfcpp::R_PPC64_TOC16_HI
:
1757 Reloc::addr16_hi(view
, got_offset
, addend
);
1760 case elfcpp::R_PPC64_TOC16_HA
:
1761 Reloc::addr16_ha(view
, got_offset
, addend
);
1764 case elfcpp::R_PPC64_TOC16_DS
:
1765 case elfcpp::R_PPC64_TOC16_LO_DS
:
1766 Reloc::addr16_ds(view
, got_offset
, addend
);
1769 case elfcpp::R_PPC64_TOC
:
1771 elfcpp::Elf_types
<64>::Elf_Addr value
;
1772 value
= target
->toc_section()->address() + toc_base_offset
;
1773 Relocate_functions
<64, false>::rela64(view
, value
, addend
);
1777 case elfcpp::R_POWERPC_COPY
:
1778 case elfcpp::R_POWERPC_GLOB_DAT
:
1779 case elfcpp::R_POWERPC_JMP_SLOT
:
1780 case elfcpp::R_POWERPC_RELATIVE
:
1781 // This is an outstanding tls reloc, which is unexpected when
1783 case elfcpp::R_POWERPC_DTPMOD
:
1784 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1785 _("unexpected reloc %u in object file"),
1790 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1791 _("unsupported reloc %u"),
1799 // Perform a TLS relocation.
1801 template<int size
, bool big_endian
>
1803 Target_powerpc
<size
, big_endian
>::Relocate::relocate_tls(
1804 const Relocate_info
<size
, big_endian
>* relinfo
,
1805 Target_powerpc
<size
, big_endian
>* target
,
1807 const elfcpp::Rela
<size
, big_endian
>& rela
,
1808 unsigned int r_type
,
1809 const Sized_symbol
<size
>* gsym
,
1810 const Symbol_value
<size
>* psymval
,
1811 unsigned char* view
,
1812 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
1815 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
1816 typedef Powerpc_relocate_functions
<size
, big_endian
> Reloc
;
1817 const Sized_relobj
<size
, big_endian
>* object
= relinfo
->object
;
1819 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
1820 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
= psymval
->value(object
, 0);
1822 const bool is_final
=
1824 ? !parameters
->options().output_is_position_independent()
1825 : gsym
->final_value_is_known());
1826 const tls::Tls_optimization optimized_type
1827 = optimize_tls_reloc(is_final
, r_type
);
1835 // Relocate section data.
1837 template<int size
, bool big_endian
>
1839 Target_powerpc
<size
, big_endian
>::relocate_section(
1840 const Relocate_info
<size
, big_endian
>* relinfo
,
1841 unsigned int sh_type
,
1842 const unsigned char* prelocs
,
1844 Output_section
* output_section
,
1845 bool needs_special_offset_handling
,
1846 unsigned char* view
,
1847 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
1848 section_size_type view_size
,
1849 const Reloc_symbol_changes
* reloc_symbol_changes
)
1851 typedef Target_powerpc
<size
, big_endian
> Powerpc
;
1852 typedef typename Target_powerpc
<size
, big_endian
>::Relocate Powerpc_relocate
;
1854 gold_assert(sh_type
== elfcpp::SHT_RELA
);
1856 gold::relocate_section
<size
, big_endian
, Powerpc
, elfcpp::SHT_RELA
,
1863 needs_special_offset_handling
,
1867 reloc_symbol_changes
);
1870 // Return the size of a relocation while scanning during a relocatable
1873 template<int size
, bool big_endian
>
1875 Target_powerpc
<size
, big_endian
>::Relocatable_size_for_reloc::get_size_for_reloc(
1879 // We are always SHT_RELA, so we should never get here.
1884 // Scan the relocs during a relocatable link.
1886 template<int size
, bool big_endian
>
1888 Target_powerpc
<size
, big_endian
>::scan_relocatable_relocs(
1889 Symbol_table
* symtab
,
1891 Sized_relobj
<size
, big_endian
>* object
,
1892 unsigned int data_shndx
,
1893 unsigned int sh_type
,
1894 const unsigned char* prelocs
,
1896 Output_section
* output_section
,
1897 bool needs_special_offset_handling
,
1898 size_t local_symbol_count
,
1899 const unsigned char* plocal_symbols
,
1900 Relocatable_relocs
* rr
)
1902 gold_assert(sh_type
== elfcpp::SHT_RELA
);
1904 typedef gold::Default_scan_relocatable_relocs
<elfcpp::SHT_RELA
,
1905 Relocatable_size_for_reloc
> Scan_relocatable_relocs
;
1907 gold::scan_relocatable_relocs
<size
, big_endian
, elfcpp::SHT_RELA
,
1908 Scan_relocatable_relocs
>(
1916 needs_special_offset_handling
,
1922 // Relocate a section during a relocatable link.
1924 template<int size
, bool big_endian
>
1926 Target_powerpc
<size
, big_endian
>::relocate_for_relocatable(
1927 const Relocate_info
<size
, big_endian
>* relinfo
,
1928 unsigned int sh_type
,
1929 const unsigned char* prelocs
,
1931 Output_section
* output_section
,
1932 off_t offset_in_output_section
,
1933 const Relocatable_relocs
* rr
,
1934 unsigned char* view
,
1935 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
1936 section_size_type view_size
,
1937 unsigned char* reloc_view
,
1938 section_size_type reloc_view_size
)
1940 gold_assert(sh_type
== elfcpp::SHT_RELA
);
1942 gold::relocate_for_relocatable
<size
, big_endian
, elfcpp::SHT_RELA
>(
1947 offset_in_output_section
,
1956 // Return the value to use for a dynamic which requires special
1957 // treatment. This is how we support equality comparisons of function
1958 // pointers across shared library boundaries, as described in the
1959 // processor specific ABI supplement.
1961 template<int size
, bool big_endian
>
1963 Target_powerpc
<size
, big_endian
>::do_dynsym_value(const Symbol
* gsym
) const
1965 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
1966 return this->plt_section()->address() + gsym
->plt_offset();
1969 // The selector for powerpc object files.
1971 template<int size
, bool big_endian
>
1972 class Target_selector_powerpc
: public Target_selector
1975 Target_selector_powerpc()
1976 : Target_selector(elfcpp::EM_NONE
, size
, big_endian
,
1978 (big_endian
? "elf64-powerpc" : "elf64-powerpcle") :
1979 (big_endian
? "elf32-powerpc" : "elf32-powerpcle")))
1982 Target
* do_recognize(int machine
, int, int)
1987 if (machine
!= elfcpp::EM_PPC64
)
1992 if (machine
!= elfcpp::EM_PPC
)
2000 return this->instantiate_target();
2003 Target
* do_instantiate_target()
2004 { return new Target_powerpc
<size
, big_endian
>(); }
2007 Target_selector_powerpc
<32, true> target_selector_ppc32
;
2008 Target_selector_powerpc
<32, false> target_selector_ppc32le
;
2009 Target_selector_powerpc
<64, true> target_selector_ppc64
;
2010 Target_selector_powerpc
<64, false> target_selector_ppc64le
;
2012 } // End anonymous namespace.