1 // arm.cc -- arm target support for gold.
3 // Copyright 2009 Free Software Foundation, Inc.
4 // Written by Doug Kwan <dougkwan@google.com> based on the i386 code
5 // by Ian Lance Taylor <iant@google.com>.
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.
32 #include "parameters.h"
39 #include "copy-relocs.h"
41 #include "target-reloc.h"
42 #include "target-select.h"
52 template<bool big_endian
>
53 class Output_data_plt_arm
;
55 // The arm target class.
57 // This is a very simple port of gold for ARM-EABI. It is intended for
58 // supporting Android only for the time being. Only these relocation types
87 // R_ARM_THM_MOVW_ABS_NC
91 // R_ARM_THM_MOVW_PREL_NC
92 // R_ARM_THM_MOVT_PREL
95 // - Generate various branch stubs.
96 // - Support interworking.
97 // - Define section symbols __exidx_start and __exidx_stop.
98 // - Support more relocation types as needed.
99 // - Make PLTs more flexible for different architecture features like
101 // There are probably a lot more.
103 // Utilities for manipulating integers of up to 32-bits
107 // Sign extend an n-bit unsigned integer stored in an uint32_t into
108 // an int32_t. NO_BITS must be between 1 to 32.
109 template<int no_bits
>
110 static inline int32_t
111 sign_extend(uint32_t bits
)
113 gold_assert(no_bits
>= 0 && no_bits
<= 32);
115 return static_cast<int32_t>(bits
);
116 uint32_t mask
= (~((uint32_t) 0)) >> (32 - no_bits
);
118 uint32_t top_bit
= 1U << (no_bits
- 1);
119 int32_t as_signed
= static_cast<int32_t>(bits
);
120 return (bits
& top_bit
) ? as_signed
+ (-top_bit
* 2) : as_signed
;
123 // Detects overflow of an NO_BITS integer stored in a uint32_t.
124 template<int no_bits
>
126 has_overflow(uint32_t bits
)
128 gold_assert(no_bits
>= 0 && no_bits
<= 32);
131 int32_t max
= (1 << (no_bits
- 1)) - 1;
132 int32_t min
= -(1 << (no_bits
- 1));
133 int32_t as_signed
= static_cast<int32_t>(bits
);
134 return as_signed
> max
|| as_signed
< min
;
137 // Detects overflow of an NO_BITS integer stored in a uint32_t when it
138 // fits in the given number of bits as either a signed or unsigned value.
139 // For example, has_signed_unsigned_overflow<8> would check
140 // -128 <= bits <= 255
141 template<int no_bits
>
143 has_signed_unsigned_overflow(uint32_t bits
)
145 gold_assert(no_bits
>= 2 && no_bits
<= 32);
148 int32_t max
= static_cast<int32_t>((1U << no_bits
) - 1);
149 int32_t min
= -(1 << (no_bits
- 1));
150 int32_t as_signed
= static_cast<int32_t>(bits
);
151 return as_signed
> max
|| as_signed
< min
;
154 // Select bits from A and B using bits in MASK. For each n in [0..31],
155 // the n-th bit in the result is chosen from the n-th bits of A and B.
156 // A zero selects A and a one selects B.
157 static inline uint32_t
158 bit_select(uint32_t a
, uint32_t b
, uint32_t mask
)
159 { return (a
& ~mask
) | (b
& mask
); }
162 template<bool big_endian
>
163 class Target_arm
: public Sized_target
<32, big_endian
>
166 typedef Output_data_reloc
<elfcpp::SHT_REL
, true, 32, big_endian
>
170 : Sized_target
<32, big_endian
>(&arm_info
),
171 got_(NULL
), plt_(NULL
), got_plt_(NULL
), rel_dyn_(NULL
),
172 copy_relocs_(elfcpp::R_ARM_COPY
), dynbss_(NULL
)
175 // Process the relocations to determine unreferenced sections for
176 // garbage collection.
178 gc_process_relocs(const General_options
& options
,
179 Symbol_table
* symtab
,
181 Sized_relobj
<32, big_endian
>* object
,
182 unsigned int data_shndx
,
183 unsigned int sh_type
,
184 const unsigned char* prelocs
,
186 Output_section
* output_section
,
187 bool needs_special_offset_handling
,
188 size_t local_symbol_count
,
189 const unsigned char* plocal_symbols
);
191 // Scan the relocations to look for symbol adjustments.
193 scan_relocs(const General_options
& options
,
194 Symbol_table
* symtab
,
196 Sized_relobj
<32, big_endian
>* object
,
197 unsigned int data_shndx
,
198 unsigned int sh_type
,
199 const unsigned char* prelocs
,
201 Output_section
* output_section
,
202 bool needs_special_offset_handling
,
203 size_t local_symbol_count
,
204 const unsigned char* plocal_symbols
);
206 // Finalize the sections.
208 do_finalize_sections(Layout
*);
210 // Return the value to use for a dynamic symbol which requires special
213 do_dynsym_value(const Symbol
*) const;
215 // Relocate a section.
217 relocate_section(const Relocate_info
<32, big_endian
>*,
218 unsigned int sh_type
,
219 const unsigned char* prelocs
,
221 Output_section
* output_section
,
222 bool needs_special_offset_handling
,
224 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
225 section_size_type view_size
,
226 const Reloc_symbol_changes
*);
228 // Scan the relocs during a relocatable link.
230 scan_relocatable_relocs(const General_options
& options
,
231 Symbol_table
* symtab
,
233 Sized_relobj
<32, big_endian
>* object
,
234 unsigned int data_shndx
,
235 unsigned int sh_type
,
236 const unsigned char* prelocs
,
238 Output_section
* output_section
,
239 bool needs_special_offset_handling
,
240 size_t local_symbol_count
,
241 const unsigned char* plocal_symbols
,
242 Relocatable_relocs
*);
244 // Relocate a section during a relocatable link.
246 relocate_for_relocatable(const Relocate_info
<32, big_endian
>*,
247 unsigned int sh_type
,
248 const unsigned char* prelocs
,
250 Output_section
* output_section
,
251 off_t offset_in_output_section
,
252 const Relocatable_relocs
*,
254 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
255 section_size_type view_size
,
256 unsigned char* reloc_view
,
257 section_size_type reloc_view_size
);
259 // Return whether SYM is defined by the ABI.
261 do_is_defined_by_abi(Symbol
* sym
) const
262 { return strcmp(sym
->name(), "__tls_get_addr") == 0; }
264 // Return the size of the GOT section.
268 gold_assert(this->got_
!= NULL
);
269 return this->got_
->data_size();
272 // Map platform-specific reloc types
274 get_real_reloc_type (unsigned int r_type
);
277 // The class which scans relocations.
282 : issued_non_pic_error_(false)
286 local(const General_options
& options
, Symbol_table
* symtab
,
287 Layout
* layout
, Target_arm
* target
,
288 Sized_relobj
<32, big_endian
>* object
,
289 unsigned int data_shndx
,
290 Output_section
* output_section
,
291 const elfcpp::Rel
<32, big_endian
>& reloc
, unsigned int r_type
,
292 const elfcpp::Sym
<32, big_endian
>& lsym
);
295 global(const General_options
& options
, Symbol_table
* symtab
,
296 Layout
* layout
, Target_arm
* target
,
297 Sized_relobj
<32, big_endian
>* object
,
298 unsigned int data_shndx
,
299 Output_section
* output_section
,
300 const elfcpp::Rel
<32, big_endian
>& reloc
, unsigned int r_type
,
305 unsupported_reloc_local(Sized_relobj
<32, big_endian
>*,
306 unsigned int r_type
);
309 unsupported_reloc_global(Sized_relobj
<32, big_endian
>*,
310 unsigned int r_type
, Symbol
*);
313 check_non_pic(Relobj
*, unsigned int r_type
);
315 // Almost identical to Symbol::needs_plt_entry except that it also
316 // handles STT_ARM_TFUNC.
318 symbol_needs_plt_entry(const Symbol
* sym
)
320 // An undefined symbol from an executable does not need a PLT entry.
321 if (sym
->is_undefined() && !parameters
->options().shared())
324 return (!parameters
->doing_static_link()
325 && (sym
->type() == elfcpp::STT_FUNC
326 || sym
->type() == elfcpp::STT_ARM_TFUNC
)
327 && (sym
->is_from_dynobj()
328 || sym
->is_undefined()
329 || sym
->is_preemptible()));
332 // Whether we have issued an error about a non-PIC compilation.
333 bool issued_non_pic_error_
;
336 // The class which implements relocation.
346 // Return whether the static relocation needs to be applied.
348 should_apply_static_reloc(const Sized_symbol
<32>* gsym
,
351 Output_section
* output_section
);
353 // Do a relocation. Return false if the caller should not issue
354 // any warnings about this relocation.
356 relocate(const Relocate_info
<32, big_endian
>*, Target_arm
*,
357 Output_section
*, size_t relnum
,
358 const elfcpp::Rel
<32, big_endian
>&,
359 unsigned int r_type
, const Sized_symbol
<32>*,
360 const Symbol_value
<32>*,
361 unsigned char*, elfcpp::Elf_types
<32>::Elf_Addr
,
364 // Return whether we want to pass flag NON_PIC_REF for this
367 reloc_is_non_pic (unsigned int r_type
)
371 case elfcpp::R_ARM_REL32
:
372 case elfcpp::R_ARM_THM_CALL
:
373 case elfcpp::R_ARM_CALL
:
374 case elfcpp::R_ARM_JUMP24
:
375 case elfcpp::R_ARM_PREL31
:
376 case elfcpp::R_ARM_THM_ABS5
:
377 case elfcpp::R_ARM_ABS8
:
378 case elfcpp::R_ARM_ABS12
:
379 case elfcpp::R_ARM_ABS16
:
380 case elfcpp::R_ARM_BASE_ABS
:
388 // A class which returns the size required for a relocation type,
389 // used while scanning relocs during a relocatable link.
390 class Relocatable_size_for_reloc
394 get_size_for_reloc(unsigned int, Relobj
*);
397 // Get the GOT section, creating it if necessary.
398 Output_data_got
<32, big_endian
>*
399 got_section(Symbol_table
*, Layout
*);
401 // Get the GOT PLT section.
403 got_plt_section() const
405 gold_assert(this->got_plt_
!= NULL
);
406 return this->got_plt_
;
409 // Create a PLT entry for a global symbol.
411 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
413 // Get the PLT section.
414 const Output_data_plt_arm
<big_endian
>*
417 gold_assert(this->plt_
!= NULL
);
421 // Get the dynamic reloc section, creating it if necessary.
423 rel_dyn_section(Layout
*);
425 // Return true if the symbol may need a COPY relocation.
426 // References from an executable object to non-function symbols
427 // defined in a dynamic object may need a COPY relocation.
429 may_need_copy_reloc(Symbol
* gsym
)
431 return (gsym
->type() != elfcpp::STT_ARM_TFUNC
432 && gsym
->may_need_copy_reloc());
435 // Add a potential copy relocation.
437 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
438 Sized_relobj
<32, big_endian
>* object
,
439 unsigned int shndx
, Output_section
* output_section
,
440 Symbol
* sym
, const elfcpp::Rel
<32, big_endian
>& reloc
)
442 this->copy_relocs_
.copy_reloc(symtab
, layout
,
443 symtab
->get_sized_symbol
<32>(sym
),
444 object
, shndx
, output_section
, reloc
,
445 this->rel_dyn_section(layout
));
448 // Information about this specific target which we pass to the
449 // general Target structure.
450 static const Target::Target_info arm_info
;
452 // The types of GOT entries needed for this platform.
455 GOT_TYPE_STANDARD
= 0 // GOT entry for a regular symbol
459 Output_data_got
<32, big_endian
>* got_
;
461 Output_data_plt_arm
<big_endian
>* plt_
;
462 // The GOT PLT section.
463 Output_data_space
* got_plt_
;
464 // The dynamic reloc section.
465 Reloc_section
* rel_dyn_
;
466 // Relocs saved to avoid a COPY reloc.
467 Copy_relocs
<elfcpp::SHT_REL
, 32, big_endian
> copy_relocs_
;
468 // Space for variables copied with a COPY reloc.
469 Output_data_space
* dynbss_
;
472 template<bool big_endian
>
473 const Target::Target_info Target_arm
<big_endian
>::arm_info
=
476 big_endian
, // is_big_endian
477 elfcpp::EM_ARM
, // machine_code
478 false, // has_make_symbol
479 false, // has_resolve
480 false, // has_code_fill
481 true, // is_default_stack_executable
483 "/usr/lib/libc.so.1", // dynamic_linker
484 0x8000, // default_text_segment_address
485 0x1000, // abi_pagesize (overridable by -z max-page-size)
486 0x1000, // common_pagesize (overridable by -z common-page-size)
487 elfcpp::SHN_UNDEF
, // small_common_shndx
488 elfcpp::SHN_UNDEF
, // large_common_shndx
489 0, // small_common_section_flags
490 0 // large_common_section_flags
493 // Arm relocate functions class
496 template<bool big_endian
>
497 class Arm_relocate_functions
: public Relocate_functions
<32, big_endian
>
502 STATUS_OKAY
, // No error during relocation.
503 STATUS_OVERFLOW
, // Relocation oveflow.
504 STATUS_BAD_RELOC
// Relocation cannot be applied.
508 typedef Relocate_functions
<32, big_endian
> Base
;
509 typedef Arm_relocate_functions
<big_endian
> This
;
511 // Get an symbol value of *PSYMVAL with an ADDEND. This is a wrapper
512 // to Symbol_value::value(). If HAS_THUMB_BIT is true, that LSB is used
513 // to distinguish ARM and THUMB functions and it is treated specially.
514 static inline Symbol_value
<32>::Value
515 arm_symbol_value (const Sized_relobj
<32, big_endian
> *object
,
516 const Symbol_value
<32>* psymval
,
517 Symbol_value
<32>::Value addend
,
520 typedef Symbol_value
<32>::Value Valtype
;
524 Valtype raw
= psymval
->value(object
, 0);
525 Valtype thumb_bit
= raw
& 1;
526 return ((raw
& ~((Valtype
) 1)) + addend
) | thumb_bit
;
529 return psymval
->value(object
, addend
);
532 // Encoding of imm16 argument for movt and movw ARM instructions
535 // imm16 := imm4 | imm12
537 // f e d c b a 9 8 7 6 5 4 3 2 1 0 f e d c b a 9 8 7 6 5 4 3 2 1 0
538 // +-------+---------------+-------+-------+-----------------------+
539 // | | |imm4 | |imm12 |
540 // +-------+---------------+-------+-------+-----------------------+
542 // Extract the relocation addend from VAL based on the ARM
543 // instruction encoding described above.
544 static inline typename
elfcpp::Swap
<32, big_endian
>::Valtype
545 extract_arm_movw_movt_addend(
546 typename
elfcpp::Swap
<32, big_endian
>::Valtype val
)
548 // According to the Elf ABI for ARM Architecture the immediate
549 // field is sign-extended to form the addend.
550 return utils::sign_extend
<16>(((val
>> 4) & 0xf000) | (val
& 0xfff));
553 // Insert X into VAL based on the ARM instruction encoding described
555 static inline typename
elfcpp::Swap
<32, big_endian
>::Valtype
556 insert_val_arm_movw_movt(
557 typename
elfcpp::Swap
<32, big_endian
>::Valtype val
,
558 typename
elfcpp::Swap
<32, big_endian
>::Valtype x
)
562 val
|= (x
& 0xf000) << 4;
566 // Encoding of imm16 argument for movt and movw Thumb2 instructions
569 // imm16 := imm4 | i | imm3 | imm8
571 // f e d c b a 9 8 7 6 5 4 3 2 1 0 f e d c b a 9 8 7 6 5 4 3 2 1 0
572 // +---------+-+-----------+-------++-+-----+-------+---------------+
573 // | |i| |imm4 || |imm3 | |imm8 |
574 // +---------+-+-----------+-------++-+-----+-------+---------------+
576 // Extract the relocation addend from VAL based on the Thumb2
577 // instruction encoding described above.
578 static inline typename
elfcpp::Swap
<32, big_endian
>::Valtype
579 extract_thumb_movw_movt_addend(
580 typename
elfcpp::Swap
<32, big_endian
>::Valtype val
)
582 // According to the Elf ABI for ARM Architecture the immediate
583 // field is sign-extended to form the addend.
584 return utils::sign_extend
<16>(((val
>> 4) & 0xf000)
585 | ((val
>> 15) & 0x0800)
586 | ((val
>> 4) & 0x0700)
590 // Insert X into VAL based on the Thumb2 instruction encoding
592 static inline typename
elfcpp::Swap
<32, big_endian
>::Valtype
593 insert_val_thumb_movw_movt(
594 typename
elfcpp::Swap
<32, big_endian
>::Valtype val
,
595 typename
elfcpp::Swap
<32, big_endian
>::Valtype x
)
598 val
|= (x
& 0xf000) << 4;
599 val
|= (x
& 0x0800) << 15;
600 val
|= (x
& 0x0700) << 4;
605 // FIXME: This probably only works for Android on ARM v5te. We should
606 // following GNU ld for the general case.
607 template<unsigned r_type
>
608 static inline typename
This::Status
609 arm_branch_common(unsigned char *view
,
610 const Sized_relobj
<32, big_endian
>* object
,
611 const Symbol_value
<32>* psymval
,
612 elfcpp::Elf_types
<32>::Elf_Addr address
,
615 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
616 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
617 Valtype val
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
619 bool insn_is_b
= (((val
>> 28) & 0xf) <= 0xe)
620 && ((val
& 0x0f000000UL
) == 0x0a000000UL
);
621 bool insn_is_uncond_bl
= (val
& 0xff000000UL
) == 0xeb000000UL
;
622 bool insn_is_cond_bl
= (((val
>> 28) & 0xf) < 0xe)
623 && ((val
& 0x0f000000UL
) == 0x0b000000UL
);
624 bool insn_is_blx
= (val
& 0xfe000000UL
) == 0xfa000000UL
;
625 bool insn_is_any_branch
= (val
& 0x0e000000UL
) == 0x0a000000UL
;
627 if (r_type
== elfcpp::R_ARM_CALL
)
629 if (!insn_is_uncond_bl
&& !insn_is_blx
)
630 return This::STATUS_BAD_RELOC
;
632 else if (r_type
== elfcpp::R_ARM_JUMP24
)
634 if (!insn_is_b
&& !insn_is_cond_bl
)
635 return This::STATUS_BAD_RELOC
;
637 else if (r_type
== elfcpp::R_ARM_PLT32
)
639 if (!insn_is_any_branch
)
640 return This::STATUS_BAD_RELOC
;
645 Valtype addend
= utils::sign_extend
<26>(val
<< 2);
646 Valtype x
= (This::arm_symbol_value(object
, psymval
, addend
, has_thumb_bit
)
649 // If target has thumb bit set, we need to either turn the BL
650 // into a BLX (for ARMv5 or above) or generate a stub.
654 if (insn_is_uncond_bl
)
655 val
= (val
& 0xffffff) | 0xfa000000 | ((x
& 2) << 23);
657 return This::STATUS_BAD_RELOC
;
660 gold_assert(!insn_is_blx
);
662 val
= utils::bit_select(val
, (x
>> 2), 0xffffffUL
);
663 elfcpp::Swap
<32, big_endian
>::writeval(wv
, val
);
664 return (utils::has_overflow
<26>(x
)
665 ? This::STATUS_OVERFLOW
: This::STATUS_OKAY
);
671 static inline typename
This::Status
672 abs8(unsigned char *view
,
673 const Sized_relobj
<32, big_endian
>* object
,
674 const Symbol_value
<32>* psymval
)
676 typedef typename
elfcpp::Swap
<8, big_endian
>::Valtype Valtype
;
677 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Reltype
;
678 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
679 Valtype val
= elfcpp::Swap
<8, big_endian
>::readval(wv
);
680 Reltype addend
= utils::sign_extend
<8>(val
);
681 Reltype x
= This::arm_symbol_value(object
, psymval
, addend
, false);
682 val
= utils::bit_select(val
, x
, 0xffU
);
683 elfcpp::Swap
<8, big_endian
>::writeval(wv
, val
);
684 return (utils::has_signed_unsigned_overflow
<8>(x
)
685 ? This::STATUS_OVERFLOW
686 : This::STATUS_OKAY
);
689 // R_ARM_THM_ABS5: S + A
690 static inline typename
This::Status
691 thm_abs5(unsigned char *view
,
692 const Sized_relobj
<32, big_endian
>* object
,
693 const Symbol_value
<32>* psymval
)
695 typedef typename
elfcpp::Swap
<16, big_endian
>::Valtype Valtype
;
696 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Reltype
;
697 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
698 Valtype val
= elfcpp::Swap
<16, big_endian
>::readval(wv
);
699 Reltype addend
= (val
& 0x7e0U
) >> 6;
700 Reltype x
= This::arm_symbol_value(object
, psymval
, addend
, false);
701 val
= utils::bit_select(val
, x
<< 6, 0x7e0U
);
702 elfcpp::Swap
<16, big_endian
>::writeval(wv
, val
);
703 return (utils::has_overflow
<5>(x
)
704 ? This::STATUS_OVERFLOW
705 : This::STATUS_OKAY
);
708 // R_ARM_ABS12: S + A
709 static inline typename
This::Status
710 abs12(unsigned char *view
,
711 const Sized_relobj
<32, big_endian
>* object
,
712 const Symbol_value
<32>* psymval
)
714 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
715 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Reltype
;
716 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
717 Valtype val
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
718 Reltype addend
= val
& 0x0fffU
;
719 Reltype x
= This::arm_symbol_value(object
, psymval
, addend
, false);
720 val
= utils::bit_select(val
, x
, 0x0fffU
);
721 elfcpp::Swap
<32, big_endian
>::writeval(wv
, val
);
722 return (utils::has_overflow
<12>(x
)
723 ? This::STATUS_OVERFLOW
724 : This::STATUS_OKAY
);
727 // R_ARM_ABS16: S + A
728 static inline typename
This::Status
729 abs16(unsigned char *view
,
730 const Sized_relobj
<32, big_endian
>* object
,
731 const Symbol_value
<32>* psymval
)
733 typedef typename
elfcpp::Swap
<16, big_endian
>::Valtype Valtype
;
734 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Reltype
;
735 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
736 Valtype val
= elfcpp::Swap
<16, big_endian
>::readval(wv
);
737 Reltype addend
= utils::sign_extend
<16>(val
);
738 Reltype x
= This::arm_symbol_value(object
, psymval
, addend
, false);
739 val
= utils::bit_select(val
, x
, 0xffffU
);
740 elfcpp::Swap
<16, big_endian
>::writeval(wv
, val
);
741 return (utils::has_signed_unsigned_overflow
<16>(x
)
742 ? This::STATUS_OVERFLOW
743 : This::STATUS_OKAY
);
746 // R_ARM_ABS32: (S + A) | T
747 static inline typename
This::Status
748 abs32(unsigned char *view
,
749 const Sized_relobj
<32, big_endian
>* object
,
750 const Symbol_value
<32>* psymval
,
753 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
754 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
755 Valtype addend
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
756 Valtype x
= This::arm_symbol_value(object
, psymval
, addend
, has_thumb_bit
);
757 elfcpp::Swap
<32, big_endian
>::writeval(wv
, x
);
758 return This::STATUS_OKAY
;
761 // R_ARM_REL32: (S + A) | T - P
762 static inline typename
This::Status
763 rel32(unsigned char *view
,
764 const Sized_relobj
<32, big_endian
>* object
,
765 const Symbol_value
<32>* psymval
,
766 elfcpp::Elf_types
<32>::Elf_Addr address
,
769 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
770 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
771 Valtype addend
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
772 Valtype x
= (This::arm_symbol_value(object
, psymval
, addend
, has_thumb_bit
)
774 elfcpp::Swap
<32, big_endian
>::writeval(wv
, x
);
775 return This::STATUS_OKAY
;
778 // R_ARM_THM_CALL: (S + A) | T - P
779 static inline typename
This::Status
780 thm_call(unsigned char *view
,
781 const Sized_relobj
<32, big_endian
>* object
,
782 const Symbol_value
<32>* psymval
,
783 elfcpp::Elf_types
<32>::Elf_Addr address
,
786 // A thumb call consists of two instructions.
787 typedef typename
elfcpp::Swap
<16, big_endian
>::Valtype Valtype
;
788 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Reltype
;
789 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
790 Valtype hi
= elfcpp::Swap
<16, big_endian
>::readval(wv
);
791 Valtype lo
= elfcpp::Swap
<16, big_endian
>::readval(wv
+ 1);
792 // Must be a BL instruction. lo == 11111xxxxxxxxxxx.
793 gold_assert((lo
& 0xf800) == 0xf800);
794 Reltype addend
= utils::sign_extend
<23>(((hi
& 0x7ff) << 12)
795 | ((lo
& 0x7ff) << 1));
796 Reltype x
= (This::arm_symbol_value(object
, psymval
, addend
, has_thumb_bit
)
799 // If target has no thumb bit set, we need to either turn the BL
800 // into a BLX (for ARMv5 or above) or generate a stub.
803 // This only works for ARMv5 and above with interworking enabled.
806 hi
= utils::bit_select(hi
, (x
>> 12), 0x7ffU
);
807 lo
= utils::bit_select(lo
, (x
>> 1), 0x7ffU
);
808 elfcpp::Swap
<16, big_endian
>::writeval(wv
, hi
);
809 elfcpp::Swap
<16, big_endian
>::writeval(wv
+ 1, lo
);
810 return (utils::has_overflow
<23>(x
)
811 ? This::STATUS_OVERFLOW
812 : This::STATUS_OKAY
);
815 // R_ARM_BASE_PREL: B(S) + A - P
816 static inline typename
This::Status
817 base_prel(unsigned char* view
,
818 elfcpp::Elf_types
<32>::Elf_Addr origin
,
819 elfcpp::Elf_types
<32>::Elf_Addr address
)
821 Base::rel32(view
, origin
- address
);
825 // R_ARM_BASE_ABS: B(S) + A
826 static inline typename
This::Status
827 base_abs(unsigned char* view
,
828 elfcpp::Elf_types
<32>::Elf_Addr origin
)
830 Base::rel32(view
, origin
);
834 // R_ARM_GOT_BREL: GOT(S) + A - GOT_ORG
835 static inline typename
This::Status
836 got_brel(unsigned char* view
,
837 typename
elfcpp::Swap
<32, big_endian
>::Valtype got_offset
)
839 Base::rel32(view
, got_offset
);
840 return This::STATUS_OKAY
;
843 // R_ARM_GOT_PREL: GOT(S) + A – P
844 static inline typename
This::Status
845 got_prel(unsigned char* view
,
846 typename
elfcpp::Swap
<32, big_endian
>::Valtype got_offset
,
847 elfcpp::Elf_types
<32>::Elf_Addr address
)
849 Base::rel32(view
, got_offset
- address
);
850 return This::STATUS_OKAY
;
853 // R_ARM_PLT32: (S + A) | T - P
854 static inline typename
This::Status
855 plt32(unsigned char *view
,
856 const Sized_relobj
<32, big_endian
>* object
,
857 const Symbol_value
<32>* psymval
,
858 elfcpp::Elf_types
<32>::Elf_Addr address
,
861 return arm_branch_common
<elfcpp::R_ARM_PLT32
>(view
, object
, psymval
,
862 address
, has_thumb_bit
);
865 // R_ARM_CALL: (S + A) | T - P
866 static inline typename
This::Status
867 call(unsigned char *view
,
868 const Sized_relobj
<32, big_endian
>* object
,
869 const Symbol_value
<32>* psymval
,
870 elfcpp::Elf_types
<32>::Elf_Addr address
,
873 return arm_branch_common
<elfcpp::R_ARM_CALL
>(view
, object
, psymval
,
874 address
, has_thumb_bit
);
877 // R_ARM_JUMP24: (S + A) | T - P
878 static inline typename
This::Status
879 jump24(unsigned char *view
,
880 const Sized_relobj
<32, big_endian
>* object
,
881 const Symbol_value
<32>* psymval
,
882 elfcpp::Elf_types
<32>::Elf_Addr address
,
885 return arm_branch_common
<elfcpp::R_ARM_JUMP24
>(view
, object
, psymval
,
886 address
, has_thumb_bit
);
889 // R_ARM_PREL: (S + A) | T - P
890 static inline typename
This::Status
891 prel31(unsigned char *view
,
892 const Sized_relobj
<32, big_endian
>* object
,
893 const Symbol_value
<32>* psymval
,
894 elfcpp::Elf_types
<32>::Elf_Addr address
,
897 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
898 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
899 Valtype val
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
900 Valtype addend
= utils::sign_extend
<31>(val
);
901 Valtype x
= (This::arm_symbol_value(object
, psymval
, addend
, has_thumb_bit
)
903 val
= utils::bit_select(val
, x
, 0x7fffffffU
);
904 elfcpp::Swap
<32, big_endian
>::writeval(wv
, val
);
905 return (utils::has_overflow
<31>(x
) ?
906 This::STATUS_OVERFLOW
: This::STATUS_OKAY
);
909 // R_ARM_MOVW_ABS_NC: (S + A) | T
910 static inline typename
This::Status
911 movw_abs_nc(unsigned char *view
,
912 const Sized_relobj
<32, big_endian
>* object
,
913 const Symbol_value
<32>* psymval
,
916 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
917 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
918 Valtype val
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
919 Valtype addend
= This::extract_arm_movw_movt_addend(val
);
920 Valtype x
= This::arm_symbol_value(object
, psymval
, addend
, has_thumb_bit
);
921 val
= This::insert_val_arm_movw_movt(val
, x
);
922 elfcpp::Swap
<32, big_endian
>::writeval(wv
, val
);
923 return This::STATUS_OKAY
;
926 // R_ARM_MOVT_ABS: S + A
927 static inline typename
This::Status
928 movt_abs(unsigned char *view
,
929 const Sized_relobj
<32, big_endian
>* object
,
930 const Symbol_value
<32>* psymval
)
932 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
933 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
934 Valtype val
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
935 Valtype addend
= This::extract_arm_movw_movt_addend(val
);
936 Valtype x
= This::arm_symbol_value(object
, psymval
, addend
, 0) >> 16;
937 val
= This::insert_val_arm_movw_movt(val
, x
);
938 elfcpp::Swap
<32, big_endian
>::writeval(wv
, val
);
939 return This::STATUS_OKAY
;
942 // R_ARM_THM_MOVW_ABS_NC: S + A | T
943 static inline typename
This::Status
944 thm_movw_abs_nc(unsigned char *view
,
945 const Sized_relobj
<32, big_endian
>* object
,
946 const Symbol_value
<32>* psymval
,
949 typedef typename
elfcpp::Swap
<16, big_endian
>::Valtype Valtype
;
950 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Reltype
;
951 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
952 Reltype val
= ((elfcpp::Swap
<16, big_endian
>::readval(wv
) << 16)
953 | elfcpp::Swap
<16, big_endian
>::readval(wv
+ 1));
954 Reltype addend
= extract_thumb_movw_movt_addend(val
);
955 Reltype x
= This::arm_symbol_value(object
, psymval
, addend
, has_thumb_bit
);
956 val
= This::insert_val_thumb_movw_movt(val
, x
);
957 elfcpp::Swap
<16, big_endian
>::writeval(wv
, val
>> 16);
958 elfcpp::Swap
<16, big_endian
>::writeval(wv
+ 1, val
& 0xffff);
959 return This::STATUS_OKAY
;
962 // R_ARM_THM_MOVT_ABS: S + A
963 static inline typename
This::Status
964 thm_movt_abs(unsigned char *view
,
965 const Sized_relobj
<32, big_endian
>* object
,
966 const Symbol_value
<32>* psymval
)
968 typedef typename
elfcpp::Swap
<16, big_endian
>::Valtype Valtype
;
969 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Reltype
;
970 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
971 Reltype val
= ((elfcpp::Swap
<16, big_endian
>::readval(wv
) << 16)
972 | elfcpp::Swap
<16, big_endian
>::readval(wv
+ 1));
973 Reltype addend
= This::extract_thumb_movw_movt_addend(val
);
974 Reltype x
= This::arm_symbol_value(object
, psymval
, addend
, 0) >> 16;
975 val
= This::insert_val_thumb_movw_movt(val
, x
);
976 elfcpp::Swap
<16, big_endian
>::writeval(wv
, val
>> 16);
977 elfcpp::Swap
<16, big_endian
>::writeval(wv
+ 1, val
& 0xffff);
978 return This::STATUS_OKAY
;
981 // R_ARM_MOVW_PREL_NC: (S + A) | T - P
982 static inline typename
This::Status
983 movw_prel_nc(unsigned char *view
,
984 const Sized_relobj
<32, big_endian
>* object
,
985 const Symbol_value
<32>* psymval
,
986 elfcpp::Elf_types
<32>::Elf_Addr address
,
989 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
990 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
991 Valtype val
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
992 Valtype addend
= This::extract_arm_movw_movt_addend(val
);
993 Valtype x
= (This::arm_symbol_value(object
, psymval
, addend
, has_thumb_bit
)
995 val
= This::insert_val_arm_movw_movt(val
, x
);
996 elfcpp::Swap
<32, big_endian
>::writeval(wv
, val
);
997 return This::STATUS_OKAY
;
1000 // R_ARM_MOVT_PREL: S + A - P
1001 static inline typename
This::Status
1002 movt_prel(unsigned char *view
,
1003 const Sized_relobj
<32, big_endian
>* object
,
1004 const Symbol_value
<32>* psymval
,
1005 elfcpp::Elf_types
<32>::Elf_Addr address
)
1007 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
1008 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
1009 Valtype val
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
1010 Valtype addend
= This::extract_arm_movw_movt_addend(val
);
1011 Valtype x
= (This::arm_symbol_value(object
, psymval
, addend
, 0)
1013 val
= This::insert_val_arm_movw_movt(val
, x
);
1014 elfcpp::Swap
<32, big_endian
>::writeval(wv
, val
);
1015 return This::STATUS_OKAY
;
1018 // R_ARM_THM_MOVW_PREL_NC: (S + A) | T - P
1019 static inline typename
This::Status
1020 thm_movw_prel_nc(unsigned char *view
,
1021 const Sized_relobj
<32, big_endian
>* object
,
1022 const Symbol_value
<32>* psymval
,
1023 elfcpp::Elf_types
<32>::Elf_Addr address
,
1026 typedef typename
elfcpp::Swap
<16, big_endian
>::Valtype Valtype
;
1027 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Reltype
;
1028 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
1029 Reltype val
= (elfcpp::Swap
<16, big_endian
>::readval(wv
) << 16)
1030 | elfcpp::Swap
<16, big_endian
>::readval(wv
+ 1);
1031 Reltype addend
= This::extract_thumb_movw_movt_addend(val
);
1032 Reltype x
= (This::arm_symbol_value(object
, psymval
, addend
, has_thumb_bit
)
1034 val
= This::insert_val_thumb_movw_movt(val
, x
);
1035 elfcpp::Swap
<16, big_endian
>::writeval(wv
, val
>> 16);
1036 elfcpp::Swap
<16, big_endian
>::writeval(wv
+ 1, val
& 0xffff);
1037 return This::STATUS_OKAY
;
1040 // R_ARM_THM_MOVT_PREL: S + A - P
1041 static inline typename
This::Status
1042 thm_movt_prel(unsigned char *view
,
1043 const Sized_relobj
<32, big_endian
>* object
,
1044 const Symbol_value
<32>* psymval
,
1045 elfcpp::Elf_types
<32>::Elf_Addr address
)
1047 typedef typename
elfcpp::Swap
<16, big_endian
>::Valtype Valtype
;
1048 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Reltype
;
1049 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
1050 Reltype val
= (elfcpp::Swap
<16, big_endian
>::readval(wv
) << 16)
1051 | elfcpp::Swap
<16, big_endian
>::readval(wv
+ 1);
1052 Reltype addend
= This::extract_thumb_movw_movt_addend(val
);
1053 Reltype x
= (This::arm_symbol_value(object
, psymval
, addend
, 0)
1055 val
= This::insert_val_thumb_movw_movt(val
, x
);
1056 elfcpp::Swap
<16, big_endian
>::writeval(wv
, val
>> 16);
1057 elfcpp::Swap
<16, big_endian
>::writeval(wv
+ 1, val
& 0xffff);
1058 return This::STATUS_OKAY
;
1062 // Get the GOT section, creating it if necessary.
1064 template<bool big_endian
>
1065 Output_data_got
<32, big_endian
>*
1066 Target_arm
<big_endian
>::got_section(Symbol_table
* symtab
, Layout
* layout
)
1068 if (this->got_
== NULL
)
1070 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
1072 this->got_
= new Output_data_got
<32, big_endian
>();
1075 os
= layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
1077 | elfcpp::SHF_WRITE
),
1081 // The old GNU linker creates a .got.plt section. We just
1082 // create another set of data in the .got section. Note that we
1083 // always create a PLT if we create a GOT, although the PLT
1085 this->got_plt_
= new Output_data_space(4, "** GOT PLT");
1086 os
= layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
1088 | elfcpp::SHF_WRITE
),
1092 // The first three entries are reserved.
1093 this->got_plt_
->set_current_data_size(3 * 4);
1095 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
1096 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
1098 0, 0, elfcpp::STT_OBJECT
,
1100 elfcpp::STV_HIDDEN
, 0,
1106 // Get the dynamic reloc section, creating it if necessary.
1108 template<bool big_endian
>
1109 typename Target_arm
<big_endian
>::Reloc_section
*
1110 Target_arm
<big_endian
>::rel_dyn_section(Layout
* layout
)
1112 if (this->rel_dyn_
== NULL
)
1114 gold_assert(layout
!= NULL
);
1115 this->rel_dyn_
= new Reloc_section(parameters
->options().combreloc());
1116 layout
->add_output_section_data(".rel.dyn", elfcpp::SHT_REL
,
1117 elfcpp::SHF_ALLOC
, this->rel_dyn_
);
1119 return this->rel_dyn_
;
1122 // A class to handle the PLT data.
1124 template<bool big_endian
>
1125 class Output_data_plt_arm
: public Output_section_data
1128 typedef Output_data_reloc
<elfcpp::SHT_REL
, true, 32, big_endian
>
1131 Output_data_plt_arm(Layout
*, Output_data_space
*);
1133 // Add an entry to the PLT.
1135 add_entry(Symbol
* gsym
);
1137 // Return the .rel.plt section data.
1138 const Reloc_section
*
1140 { return this->rel_
; }
1144 do_adjust_output_section(Output_section
* os
);
1146 // Write to a map file.
1148 do_print_to_mapfile(Mapfile
* mapfile
) const
1149 { mapfile
->print_output_data(this, _("** PLT")); }
1152 // Template for the first PLT entry.
1153 static const uint32_t first_plt_entry
[5];
1155 // Template for subsequent PLT entries.
1156 static const uint32_t plt_entry
[3];
1158 // Set the final size.
1160 set_final_data_size()
1162 this->set_data_size(sizeof(first_plt_entry
)
1163 + this->count_
* sizeof(plt_entry
));
1166 // Write out the PLT data.
1168 do_write(Output_file
*);
1170 // The reloc section.
1171 Reloc_section
* rel_
;
1172 // The .got.plt section.
1173 Output_data_space
* got_plt_
;
1174 // The number of PLT entries.
1175 unsigned int count_
;
1178 // Create the PLT section. The ordinary .got section is an argument,
1179 // since we need to refer to the start. We also create our own .got
1180 // section just for PLT entries.
1182 template<bool big_endian
>
1183 Output_data_plt_arm
<big_endian
>::Output_data_plt_arm(Layout
* layout
,
1184 Output_data_space
* got_plt
)
1185 : Output_section_data(4), got_plt_(got_plt
), count_(0)
1187 this->rel_
= new Reloc_section(false);
1188 layout
->add_output_section_data(".rel.plt", elfcpp::SHT_REL
,
1189 elfcpp::SHF_ALLOC
, this->rel_
);
1192 template<bool big_endian
>
1194 Output_data_plt_arm
<big_endian
>::do_adjust_output_section(Output_section
* os
)
1199 // Add an entry to the PLT.
1201 template<bool big_endian
>
1203 Output_data_plt_arm
<big_endian
>::add_entry(Symbol
* gsym
)
1205 gold_assert(!gsym
->has_plt_offset());
1207 // Note that when setting the PLT offset we skip the initial
1208 // reserved PLT entry.
1209 gsym
->set_plt_offset((this->count_
) * sizeof(plt_entry
)
1210 + sizeof(first_plt_entry
));
1214 section_offset_type got_offset
= this->got_plt_
->current_data_size();
1216 // Every PLT entry needs a GOT entry which points back to the PLT
1217 // entry (this will be changed by the dynamic linker, normally
1218 // lazily when the function is called).
1219 this->got_plt_
->set_current_data_size(got_offset
+ 4);
1221 // Every PLT entry needs a reloc.
1222 gsym
->set_needs_dynsym_entry();
1223 this->rel_
->add_global(gsym
, elfcpp::R_ARM_JUMP_SLOT
, this->got_plt_
,
1226 // Note that we don't need to save the symbol. The contents of the
1227 // PLT are independent of which symbols are used. The symbols only
1228 // appear in the relocations.
1232 // FIXME: This is not very flexible. Right now this has only been tested
1233 // on armv5te. If we are to support additional architecture features like
1234 // Thumb-2 or BE8, we need to make this more flexible like GNU ld.
1236 // The first entry in the PLT.
1237 template<bool big_endian
>
1238 const uint32_t Output_data_plt_arm
<big_endian
>::first_plt_entry
[5] =
1240 0xe52de004, // str lr, [sp, #-4]!
1241 0xe59fe004, // ldr lr, [pc, #4]
1242 0xe08fe00e, // add lr, pc, lr
1243 0xe5bef008, // ldr pc, [lr, #8]!
1244 0x00000000, // &GOT[0] - .
1247 // Subsequent entries in the PLT.
1249 template<bool big_endian
>
1250 const uint32_t Output_data_plt_arm
<big_endian
>::plt_entry
[3] =
1252 0xe28fc600, // add ip, pc, #0xNN00000
1253 0xe28cca00, // add ip, ip, #0xNN000
1254 0xe5bcf000, // ldr pc, [ip, #0xNNN]!
1257 // Write out the PLT. This uses the hand-coded instructions above,
1258 // and adjusts them as needed. This is all specified by the arm ELF
1259 // Processor Supplement.
1261 template<bool big_endian
>
1263 Output_data_plt_arm
<big_endian
>::do_write(Output_file
* of
)
1265 const off_t offset
= this->offset();
1266 const section_size_type oview_size
=
1267 convert_to_section_size_type(this->data_size());
1268 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
1270 const off_t got_file_offset
= this->got_plt_
->offset();
1271 const section_size_type got_size
=
1272 convert_to_section_size_type(this->got_plt_
->data_size());
1273 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
1275 unsigned char* pov
= oview
;
1277 elfcpp::Elf_types
<32>::Elf_Addr plt_address
= this->address();
1278 elfcpp::Elf_types
<32>::Elf_Addr got_address
= this->got_plt_
->address();
1280 // Write first PLT entry. All but the last word are constants.
1281 const size_t num_first_plt_words
= (sizeof(first_plt_entry
)
1282 / sizeof(plt_entry
[0]));
1283 for (size_t i
= 0; i
< num_first_plt_words
- 1; i
++)
1284 elfcpp::Swap
<32, big_endian
>::writeval(pov
+ i
* 4, first_plt_entry
[i
]);
1285 // Last word in first PLT entry is &GOT[0] - .
1286 elfcpp::Swap
<32, big_endian
>::writeval(pov
+ 16,
1287 got_address
- (plt_address
+ 16));
1288 pov
+= sizeof(first_plt_entry
);
1290 unsigned char* got_pov
= got_view
;
1292 memset(got_pov
, 0, 12);
1295 const int rel_size
= elfcpp::Elf_sizes
<32>::rel_size
;
1296 unsigned int plt_offset
= sizeof(first_plt_entry
);
1297 unsigned int plt_rel_offset
= 0;
1298 unsigned int got_offset
= 12;
1299 const unsigned int count
= this->count_
;
1300 for (unsigned int i
= 0;
1303 pov
+= sizeof(plt_entry
),
1305 plt_offset
+= sizeof(plt_entry
),
1306 plt_rel_offset
+= rel_size
,
1309 // Set and adjust the PLT entry itself.
1310 int32_t offset
= ((got_address
+ got_offset
)
1311 - (plt_address
+ plt_offset
+ 8));
1313 gold_assert(offset
>= 0 && offset
< 0x0fffffff);
1314 uint32_t plt_insn0
= plt_entry
[0] | ((offset
>> 20) & 0xff);
1315 elfcpp::Swap
<32, big_endian
>::writeval(pov
, plt_insn0
);
1316 uint32_t plt_insn1
= plt_entry
[1] | ((offset
>> 12) & 0xff);
1317 elfcpp::Swap
<32, big_endian
>::writeval(pov
+ 4, plt_insn1
);
1318 uint32_t plt_insn2
= plt_entry
[2] | (offset
& 0xfff);
1319 elfcpp::Swap
<32, big_endian
>::writeval(pov
+ 8, plt_insn2
);
1321 // Set the entry in the GOT.
1322 elfcpp::Swap
<32, big_endian
>::writeval(got_pov
, plt_address
);
1325 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
1326 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
1328 of
->write_output_view(offset
, oview_size
, oview
);
1329 of
->write_output_view(got_file_offset
, got_size
, got_view
);
1332 // Create a PLT entry for a global symbol.
1334 template<bool big_endian
>
1336 Target_arm
<big_endian
>::make_plt_entry(Symbol_table
* symtab
, Layout
* layout
,
1339 if (gsym
->has_plt_offset())
1342 if (this->plt_
== NULL
)
1344 // Create the GOT sections first.
1345 this->got_section(symtab
, layout
);
1347 this->plt_
= new Output_data_plt_arm
<big_endian
>(layout
, this->got_plt_
);
1348 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
1350 | elfcpp::SHF_EXECINSTR
),
1353 this->plt_
->add_entry(gsym
);
1356 // Report an unsupported relocation against a local symbol.
1358 template<bool big_endian
>
1360 Target_arm
<big_endian
>::Scan::unsupported_reloc_local(
1361 Sized_relobj
<32, big_endian
>* object
,
1362 unsigned int r_type
)
1364 gold_error(_("%s: unsupported reloc %u against local symbol"),
1365 object
->name().c_str(), r_type
);
1368 // We are about to emit a dynamic relocation of type R_TYPE. If the
1369 // dynamic linker does not support it, issue an error. The GNU linker
1370 // only issues a non-PIC error for an allocated read-only section.
1371 // Here we know the section is allocated, but we don't know that it is
1372 // read-only. But we check for all the relocation types which the
1373 // glibc dynamic linker supports, so it seems appropriate to issue an
1374 // error even if the section is not read-only.
1376 template<bool big_endian
>
1378 Target_arm
<big_endian
>::Scan::check_non_pic(Relobj
* object
,
1379 unsigned int r_type
)
1383 // These are the relocation types supported by glibc for ARM.
1384 case elfcpp::R_ARM_RELATIVE
:
1385 case elfcpp::R_ARM_COPY
:
1386 case elfcpp::R_ARM_GLOB_DAT
:
1387 case elfcpp::R_ARM_JUMP_SLOT
:
1388 case elfcpp::R_ARM_ABS32
:
1389 case elfcpp::R_ARM_ABS32_NOI
:
1390 case elfcpp::R_ARM_PC24
:
1391 // FIXME: The following 3 types are not supported by Android's dynamic
1393 case elfcpp::R_ARM_TLS_DTPMOD32
:
1394 case elfcpp::R_ARM_TLS_DTPOFF32
:
1395 case elfcpp::R_ARM_TLS_TPOFF32
:
1399 // This prevents us from issuing more than one error per reloc
1400 // section. But we can still wind up issuing more than one
1401 // error per object file.
1402 if (this->issued_non_pic_error_
)
1404 object
->error(_("requires unsupported dynamic reloc; "
1405 "recompile with -fPIC"));
1406 this->issued_non_pic_error_
= true;
1409 case elfcpp::R_ARM_NONE
:
1414 // Scan a relocation for a local symbol.
1415 // FIXME: This only handles a subset of relocation types used by Android
1416 // on ARM v5te devices.
1418 template<bool big_endian
>
1420 Target_arm
<big_endian
>::Scan::local(const General_options
&,
1421 Symbol_table
* symtab
,
1424 Sized_relobj
<32, big_endian
>* object
,
1425 unsigned int data_shndx
,
1426 Output_section
* output_section
,
1427 const elfcpp::Rel
<32, big_endian
>& reloc
,
1428 unsigned int r_type
,
1429 const elfcpp::Sym
<32, big_endian
>&)
1431 r_type
= get_real_reloc_type(r_type
);
1434 case elfcpp::R_ARM_NONE
:
1437 case elfcpp::R_ARM_ABS32
:
1438 case elfcpp::R_ARM_ABS32_NOI
:
1439 // If building a shared library (or a position-independent
1440 // executable), we need to create a dynamic relocation for
1441 // this location. The relocation applied at link time will
1442 // apply the link-time value, so we flag the location with
1443 // an R_ARM_RELATIVE relocation so the dynamic loader can
1444 // relocate it easily.
1445 if (parameters
->options().output_is_position_independent())
1447 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1448 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1449 // If we are to add more other reloc types than R_ARM_ABS32,
1450 // we need to add check_non_pic(object, r_type) here.
1451 rel_dyn
->add_local_relative(object
, r_sym
, elfcpp::R_ARM_RELATIVE
,
1452 output_section
, data_shndx
,
1453 reloc
.get_r_offset());
1457 case elfcpp::R_ARM_REL32
:
1458 case elfcpp::R_ARM_THM_CALL
:
1459 case elfcpp::R_ARM_CALL
:
1460 case elfcpp::R_ARM_PREL31
:
1461 case elfcpp::R_ARM_JUMP24
:
1462 case elfcpp::R_ARM_PLT32
:
1463 case elfcpp::R_ARM_THM_ABS5
:
1464 case elfcpp::R_ARM_ABS8
:
1465 case elfcpp::R_ARM_ABS12
:
1466 case elfcpp::R_ARM_ABS16
:
1467 case elfcpp::R_ARM_BASE_ABS
:
1468 case elfcpp::R_ARM_MOVW_ABS_NC
:
1469 case elfcpp::R_ARM_MOVT_ABS
:
1470 case elfcpp::R_ARM_THM_MOVW_ABS_NC
:
1471 case elfcpp::R_ARM_THM_MOVT_ABS
:
1472 case elfcpp::R_ARM_MOVW_PREL_NC
:
1473 case elfcpp::R_ARM_MOVT_PREL
:
1474 case elfcpp::R_ARM_THM_MOVW_PREL_NC
:
1475 case elfcpp::R_ARM_THM_MOVT_PREL
:
1478 case elfcpp::R_ARM_GOTOFF32
:
1479 // We need a GOT section:
1480 target
->got_section(symtab
, layout
);
1483 case elfcpp::R_ARM_BASE_PREL
:
1484 // FIXME: What about this?
1487 case elfcpp::R_ARM_GOT_BREL
:
1488 case elfcpp::R_ARM_GOT_PREL
:
1490 // The symbol requires a GOT entry.
1491 Output_data_got
<32, big_endian
>* got
=
1492 target
->got_section(symtab
, layout
);
1493 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1494 if (got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
))
1496 // If we are generating a shared object, we need to add a
1497 // dynamic RELATIVE relocation for this symbol's GOT entry.
1498 if (parameters
->options().output_is_position_independent())
1500 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1501 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(reloc
.get_r_info());
1502 rel_dyn
->add_local_relative(
1503 object
, r_sym
, elfcpp::R_ARM_RELATIVE
, got
,
1504 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
));
1510 case elfcpp::R_ARM_TARGET1
:
1511 // This should have been mapped to another type already.
1513 case elfcpp::R_ARM_COPY
:
1514 case elfcpp::R_ARM_GLOB_DAT
:
1515 case elfcpp::R_ARM_JUMP_SLOT
:
1516 case elfcpp::R_ARM_RELATIVE
:
1517 // These are relocations which should only be seen by the
1518 // dynamic linker, and should never be seen here.
1519 gold_error(_("%s: unexpected reloc %u in object file"),
1520 object
->name().c_str(), r_type
);
1524 unsupported_reloc_local(object
, r_type
);
1529 // Report an unsupported relocation against a global symbol.
1531 template<bool big_endian
>
1533 Target_arm
<big_endian
>::Scan::unsupported_reloc_global(
1534 Sized_relobj
<32, big_endian
>* object
,
1535 unsigned int r_type
,
1538 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1539 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
1542 // Scan a relocation for a global symbol.
1543 // FIXME: This only handles a subset of relocation types used by Android
1544 // on ARM v5te devices.
1546 template<bool big_endian
>
1548 Target_arm
<big_endian
>::Scan::global(const General_options
&,
1549 Symbol_table
* symtab
,
1552 Sized_relobj
<32, big_endian
>* object
,
1553 unsigned int data_shndx
,
1554 Output_section
* output_section
,
1555 const elfcpp::Rel
<32, big_endian
>& reloc
,
1556 unsigned int r_type
,
1559 r_type
= get_real_reloc_type(r_type
);
1562 case elfcpp::R_ARM_NONE
:
1565 case elfcpp::R_ARM_ABS32
:
1566 case elfcpp::R_ARM_ABS32_NOI
:
1568 // Make a dynamic relocation if necessary.
1569 if (gsym
->needs_dynamic_reloc(Symbol::ABSOLUTE_REF
))
1571 if (target
->may_need_copy_reloc(gsym
))
1573 target
->copy_reloc(symtab
, layout
, object
,
1574 data_shndx
, output_section
, gsym
, reloc
);
1576 else if (gsym
->can_use_relative_reloc(false))
1578 // If we are to add more other reloc types than R_ARM_ABS32,
1579 // we need to add check_non_pic(object, r_type) here.
1580 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1581 rel_dyn
->add_global_relative(gsym
, elfcpp::R_ARM_RELATIVE
,
1582 output_section
, object
,
1583 data_shndx
, reloc
.get_r_offset());
1587 // If we are to add more other reloc types than R_ARM_ABS32,
1588 // we need to add check_non_pic(object, r_type) here.
1589 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1590 rel_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1591 data_shndx
, reloc
.get_r_offset());
1597 case elfcpp::R_ARM_MOVW_ABS_NC
:
1598 case elfcpp::R_ARM_MOVT_ABS
:
1599 case elfcpp::R_ARM_THM_MOVW_ABS_NC
:
1600 case elfcpp::R_ARM_THM_MOVT_ABS
:
1601 case elfcpp::R_ARM_MOVW_PREL_NC
:
1602 case elfcpp::R_ARM_MOVT_PREL
:
1603 case elfcpp::R_ARM_THM_MOVW_PREL_NC
:
1604 case elfcpp::R_ARM_THM_MOVT_PREL
:
1607 case elfcpp::R_ARM_THM_ABS5
:
1608 case elfcpp::R_ARM_ABS8
:
1609 case elfcpp::R_ARM_ABS12
:
1610 case elfcpp::R_ARM_ABS16
:
1611 case elfcpp::R_ARM_BASE_ABS
:
1613 // No dynamic relocs of this kinds.
1614 // Report the error in case of PIC.
1615 int flags
= Symbol::NON_PIC_REF
;
1616 if (gsym
->type() == elfcpp::STT_FUNC
1617 || gsym
->type() == elfcpp::STT_ARM_TFUNC
)
1618 flags
|= Symbol::FUNCTION_CALL
;
1619 if (gsym
->needs_dynamic_reloc(flags
))
1620 check_non_pic(object
, r_type
);
1624 case elfcpp::R_ARM_REL32
:
1625 case elfcpp::R_ARM_PREL31
:
1627 // Make a dynamic relocation if necessary.
1628 int flags
= Symbol::NON_PIC_REF
;
1629 if (gsym
->needs_dynamic_reloc(flags
))
1631 if (target
->may_need_copy_reloc(gsym
))
1633 target
->copy_reloc(symtab
, layout
, object
,
1634 data_shndx
, output_section
, gsym
, reloc
);
1638 check_non_pic(object
, r_type
);
1639 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1640 rel_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1641 data_shndx
, reloc
.get_r_offset());
1647 case elfcpp::R_ARM_JUMP24
:
1648 case elfcpp::R_ARM_THM_CALL
:
1649 case elfcpp::R_ARM_CALL
:
1651 if (Target_arm
<big_endian
>::Scan::symbol_needs_plt_entry(gsym
))
1652 target
->make_plt_entry(symtab
, layout
, gsym
);
1653 // Make a dynamic relocation if necessary.
1654 int flags
= Symbol::NON_PIC_REF
;
1655 if (gsym
->type() == elfcpp::STT_FUNC
1656 || gsym
->type() == elfcpp::STT_ARM_TFUNC
)
1657 flags
|= Symbol::FUNCTION_CALL
;
1658 if (gsym
->needs_dynamic_reloc(flags
))
1660 if (target
->may_need_copy_reloc(gsym
))
1662 target
->copy_reloc(symtab
, layout
, object
,
1663 data_shndx
, output_section
, gsym
,
1668 check_non_pic(object
, r_type
);
1669 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1670 rel_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1671 data_shndx
, reloc
.get_r_offset());
1677 case elfcpp::R_ARM_PLT32
:
1678 // If the symbol is fully resolved, this is just a relative
1679 // local reloc. Otherwise we need a PLT entry.
1680 if (gsym
->final_value_is_known())
1682 // If building a shared library, we can also skip the PLT entry
1683 // if the symbol is defined in the output file and is protected
1685 if (gsym
->is_defined()
1686 && !gsym
->is_from_dynobj()
1687 && !gsym
->is_preemptible())
1689 target
->make_plt_entry(symtab
, layout
, gsym
);
1692 case elfcpp::R_ARM_GOTOFF32
:
1693 // We need a GOT section.
1694 target
->got_section(symtab
, layout
);
1697 case elfcpp::R_ARM_BASE_PREL
:
1698 // FIXME: What about this?
1701 case elfcpp::R_ARM_GOT_BREL
:
1702 case elfcpp::R_ARM_GOT_PREL
:
1704 // The symbol requires a GOT entry.
1705 Output_data_got
<32, big_endian
>* got
=
1706 target
->got_section(symtab
, layout
);
1707 if (gsym
->final_value_is_known())
1708 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
1711 // If this symbol is not fully resolved, we need to add a
1712 // GOT entry with a dynamic relocation.
1713 Reloc_section
* rel_dyn
= target
->rel_dyn_section(layout
);
1714 if (gsym
->is_from_dynobj()
1715 || gsym
->is_undefined()
1716 || gsym
->is_preemptible())
1717 got
->add_global_with_rel(gsym
, GOT_TYPE_STANDARD
,
1718 rel_dyn
, elfcpp::R_ARM_GLOB_DAT
);
1721 if (got
->add_global(gsym
, GOT_TYPE_STANDARD
))
1722 rel_dyn
->add_global_relative(
1723 gsym
, elfcpp::R_ARM_RELATIVE
, got
,
1724 gsym
->got_offset(GOT_TYPE_STANDARD
));
1730 case elfcpp::R_ARM_TARGET1
:
1731 // This should have been mapped to another type already.
1733 case elfcpp::R_ARM_COPY
:
1734 case elfcpp::R_ARM_GLOB_DAT
:
1735 case elfcpp::R_ARM_JUMP_SLOT
:
1736 case elfcpp::R_ARM_RELATIVE
:
1737 // These are relocations which should only be seen by the
1738 // dynamic linker, and should never be seen here.
1739 gold_error(_("%s: unexpected reloc %u in object file"),
1740 object
->name().c_str(), r_type
);
1744 unsupported_reloc_global(object
, r_type
, gsym
);
1749 // Process relocations for gc.
1751 template<bool big_endian
>
1753 Target_arm
<big_endian
>::gc_process_relocs(const General_options
& options
,
1754 Symbol_table
* symtab
,
1756 Sized_relobj
<32, big_endian
>* object
,
1757 unsigned int data_shndx
,
1759 const unsigned char* prelocs
,
1761 Output_section
* output_section
,
1762 bool needs_special_offset_handling
,
1763 size_t local_symbol_count
,
1764 const unsigned char* plocal_symbols
)
1766 typedef Target_arm
<big_endian
> Arm
;
1767 typedef typename Target_arm
<big_endian
>::Scan Scan
;
1769 gold::gc_process_relocs
<32, big_endian
, Arm
, elfcpp::SHT_REL
, Scan
>(
1779 needs_special_offset_handling
,
1784 // Scan relocations for a section.
1786 template<bool big_endian
>
1788 Target_arm
<big_endian
>::scan_relocs(const General_options
& options
,
1789 Symbol_table
* symtab
,
1791 Sized_relobj
<32, big_endian
>* object
,
1792 unsigned int data_shndx
,
1793 unsigned int sh_type
,
1794 const unsigned char* prelocs
,
1796 Output_section
* output_section
,
1797 bool needs_special_offset_handling
,
1798 size_t local_symbol_count
,
1799 const unsigned char* plocal_symbols
)
1801 typedef typename Target_arm
<big_endian
>::Scan Scan
;
1802 if (sh_type
== elfcpp::SHT_RELA
)
1804 gold_error(_("%s: unsupported RELA reloc section"),
1805 object
->name().c_str());
1809 gold::scan_relocs
<32, big_endian
, Target_arm
, elfcpp::SHT_REL
, Scan
>(
1819 needs_special_offset_handling
,
1824 // Finalize the sections.
1826 template<bool big_endian
>
1828 Target_arm
<big_endian
>::do_finalize_sections(Layout
* layout
)
1830 // Fill in some more dynamic tags.
1831 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
1834 if (this->got_plt_
!= NULL
)
1835 odyn
->add_section_address(elfcpp::DT_PLTGOT
, this->got_plt_
);
1837 if (this->plt_
!= NULL
)
1839 const Output_data
* od
= this->plt_
->rel_plt();
1840 odyn
->add_section_size(elfcpp::DT_PLTRELSZ
, od
);
1841 odyn
->add_section_address(elfcpp::DT_JMPREL
, od
);
1842 odyn
->add_constant(elfcpp::DT_PLTREL
, elfcpp::DT_REL
);
1845 if (this->rel_dyn_
!= NULL
)
1847 const Output_data
* od
= this->rel_dyn_
;
1848 odyn
->add_section_address(elfcpp::DT_REL
, od
);
1849 odyn
->add_section_size(elfcpp::DT_RELSZ
, od
);
1850 odyn
->add_constant(elfcpp::DT_RELENT
,
1851 elfcpp::Elf_sizes
<32>::rel_size
);
1854 if (!parameters
->options().shared())
1856 // The value of the DT_DEBUG tag is filled in by the dynamic
1857 // linker at run time, and used by the debugger.
1858 odyn
->add_constant(elfcpp::DT_DEBUG
, 0);
1862 // Emit any relocs we saved in an attempt to avoid generating COPY
1864 if (this->copy_relocs_
.any_saved_relocs())
1865 this->copy_relocs_
.emit(this->rel_dyn_section(layout
));
1867 // For the ARM target, we need to add a PT_ARM_EXIDX segment for
1868 // the .ARM.exidx section.
1869 if (!layout
->script_options()->saw_phdrs_clause()
1870 && !parameters
->options().relocatable())
1872 Output_section
* exidx_section
=
1873 layout
->find_output_section(".ARM.exidx");
1875 if (exidx_section
!= NULL
1876 && exidx_section
->type() == elfcpp::SHT_ARM_EXIDX
)
1878 gold_assert(layout
->find_output_segment(elfcpp::PT_ARM_EXIDX
, 0, 0)
1880 Output_segment
* exidx_segment
=
1881 layout
->make_output_segment(elfcpp::PT_ARM_EXIDX
, elfcpp::PF_R
);
1882 exidx_segment
->add_output_section(exidx_section
, elfcpp::PF_R
);
1887 // Return whether a direct absolute static relocation needs to be applied.
1888 // In cases where Scan::local() or Scan::global() has created
1889 // a dynamic relocation other than R_ARM_RELATIVE, the addend
1890 // of the relocation is carried in the data, and we must not
1891 // apply the static relocation.
1893 template<bool big_endian
>
1895 Target_arm
<big_endian
>::Relocate::should_apply_static_reloc(
1896 const Sized_symbol
<32>* gsym
,
1899 Output_section
* output_section
)
1901 // If the output section is not allocated, then we didn't call
1902 // scan_relocs, we didn't create a dynamic reloc, and we must apply
1904 if ((output_section
->flags() & elfcpp::SHF_ALLOC
) == 0)
1907 // For local symbols, we will have created a non-RELATIVE dynamic
1908 // relocation only if (a) the output is position independent,
1909 // (b) the relocation is absolute (not pc- or segment-relative), and
1910 // (c) the relocation is not 32 bits wide.
1912 return !(parameters
->options().output_is_position_independent()
1913 && (ref_flags
& Symbol::ABSOLUTE_REF
)
1916 // For global symbols, we use the same helper routines used in the
1917 // scan pass. If we did not create a dynamic relocation, or if we
1918 // created a RELATIVE dynamic relocation, we should apply the static
1920 bool has_dyn
= gsym
->needs_dynamic_reloc(ref_flags
);
1921 bool is_rel
= (ref_flags
& Symbol::ABSOLUTE_REF
)
1922 && gsym
->can_use_relative_reloc(ref_flags
1923 & Symbol::FUNCTION_CALL
);
1924 return !has_dyn
|| is_rel
;
1927 // Perform a relocation.
1929 template<bool big_endian
>
1931 Target_arm
<big_endian
>::Relocate::relocate(
1932 const Relocate_info
<32, big_endian
>* relinfo
,
1934 Output_section
*output_section
,
1936 const elfcpp::Rel
<32, big_endian
>& rel
,
1937 unsigned int r_type
,
1938 const Sized_symbol
<32>* gsym
,
1939 const Symbol_value
<32>* psymval
,
1940 unsigned char* view
,
1941 elfcpp::Elf_types
<32>::Elf_Addr address
,
1942 section_size_type
/* view_size */ )
1944 typedef Arm_relocate_functions
<big_endian
> Arm_relocate_functions
;
1946 r_type
= get_real_reloc_type(r_type
);
1948 // If this the symbol may be a Thumb function, set thumb bit to 1.
1949 bool has_thumb_bit
= ((gsym
!= NULL
)
1950 && (gsym
->type() == elfcpp::STT_FUNC
1951 || gsym
->type() == elfcpp::STT_ARM_TFUNC
));
1953 // Pick the value to use for symbols defined in shared objects.
1954 Symbol_value
<32> symval
;
1956 && gsym
->use_plt_offset(reloc_is_non_pic(r_type
)))
1958 symval
.set_output_value(target
->plt_section()->address()
1959 + gsym
->plt_offset());
1964 const Sized_relobj
<32, big_endian
>* object
= relinfo
->object
;
1966 // Get the GOT offset if needed.
1967 // The GOT pointer points to the end of the GOT section.
1968 // We need to subtract the size of the GOT section to get
1969 // the actual offset to use in the relocation.
1970 bool have_got_offset
= false;
1971 unsigned int got_offset
= 0;
1974 case elfcpp::R_ARM_GOT_BREL
:
1975 case elfcpp::R_ARM_GOT_PREL
:
1978 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
1979 got_offset
= (gsym
->got_offset(GOT_TYPE_STANDARD
)
1980 - target
->got_size());
1984 unsigned int r_sym
= elfcpp::elf_r_sym
<32>(rel
.get_r_info());
1985 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
1986 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
1987 - target
->got_size());
1989 have_got_offset
= true;
1996 typename
Arm_relocate_functions::Status reloc_status
=
1997 Arm_relocate_functions::STATUS_OKAY
;
2000 case elfcpp::R_ARM_NONE
:
2003 case elfcpp::R_ARM_ABS8
:
2004 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, false,
2006 reloc_status
= Arm_relocate_functions::abs8(view
, object
, psymval
);
2009 case elfcpp::R_ARM_ABS12
:
2010 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, false,
2012 reloc_status
= Arm_relocate_functions::abs12(view
, object
, psymval
);
2015 case elfcpp::R_ARM_ABS16
:
2016 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, false,
2018 reloc_status
= Arm_relocate_functions::abs16(view
, object
, psymval
);
2021 case elfcpp::R_ARM_ABS32
:
2022 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, true,
2024 reloc_status
= Arm_relocate_functions::abs32(view
, object
, psymval
,
2028 case elfcpp::R_ARM_ABS32_NOI
:
2029 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, true,
2031 // No thumb bit for this relocation: (S + A)
2032 reloc_status
= Arm_relocate_functions::abs32(view
, object
, psymval
,
2036 case elfcpp::R_ARM_MOVW_ABS_NC
:
2037 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, true,
2039 reloc_status
= Arm_relocate_functions::movw_abs_nc(view
, object
,
2043 gold_error(_("relocation R_ARM_MOVW_ABS_NC cannot be used when making"
2044 "a shared object; recompile with -fPIC"));
2047 case elfcpp::R_ARM_MOVT_ABS
:
2048 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, true,
2050 reloc_status
= Arm_relocate_functions::movt_abs(view
, object
, psymval
);
2052 gold_error(_("relocation R_ARM_MOVT_ABS cannot be used when making"
2053 "a shared object; recompile with -fPIC"));
2056 case elfcpp::R_ARM_THM_MOVW_ABS_NC
:
2057 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, true,
2059 reloc_status
= Arm_relocate_functions::thm_movw_abs_nc(view
, object
,
2063 gold_error(_("relocation R_ARM_THM_MOVW_ABS_NC cannot be used when"
2064 "making a shared object; recompile with -fPIC"));
2067 case elfcpp::R_ARM_THM_MOVT_ABS
:
2068 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, true,
2070 reloc_status
= Arm_relocate_functions::thm_movt_abs(view
, object
,
2073 gold_error(_("relocation R_ARM_THM_MOVT_ABS cannot be used when"
2074 "making a shared object; recompile with -fPIC"));
2077 case elfcpp::R_ARM_MOVW_PREL_NC
:
2078 reloc_status
= Arm_relocate_functions::movw_prel_nc(view
, object
,
2083 case elfcpp::R_ARM_MOVT_PREL
:
2084 reloc_status
= Arm_relocate_functions::movt_prel(view
, object
,
2088 case elfcpp::R_ARM_THM_MOVW_PREL_NC
:
2089 reloc_status
= Arm_relocate_functions::thm_movw_prel_nc(view
, object
,
2094 case elfcpp::R_ARM_THM_MOVT_PREL
:
2095 reloc_status
= Arm_relocate_functions::thm_movt_prel(view
, object
,
2099 case elfcpp::R_ARM_REL32
:
2100 reloc_status
= Arm_relocate_functions::rel32(view
, object
, psymval
,
2101 address
, has_thumb_bit
);
2104 case elfcpp::R_ARM_THM_ABS5
:
2105 if (should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, false,
2107 reloc_status
= Arm_relocate_functions::thm_abs5(view
, object
, psymval
);
2110 case elfcpp::R_ARM_THM_CALL
:
2111 reloc_status
= Arm_relocate_functions::thm_call(view
, object
, psymval
,
2112 address
, has_thumb_bit
);
2115 case elfcpp::R_ARM_GOTOFF32
:
2117 elfcpp::Elf_types
<32>::Elf_Addr got_origin
;
2118 got_origin
= target
->got_plt_section()->address();
2119 reloc_status
= Arm_relocate_functions::rel32(view
, object
, psymval
,
2120 got_origin
, has_thumb_bit
);
2124 case elfcpp::R_ARM_BASE_PREL
:
2127 // Get the addressing origin of the output segment defining the
2128 // symbol gsym (AAELF 4.6.1.2 Relocation types)
2129 gold_assert(gsym
!= NULL
);
2130 if (gsym
->source() == Symbol::IN_OUTPUT_SEGMENT
)
2131 origin
= gsym
->output_segment()->vaddr();
2132 else if (gsym
->source () == Symbol::IN_OUTPUT_DATA
)
2133 origin
= gsym
->output_data()->address();
2136 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2137 _("cannot find origin of R_ARM_BASE_PREL"));
2140 reloc_status
= Arm_relocate_functions::base_prel(view
, origin
, address
);
2144 case elfcpp::R_ARM_BASE_ABS
:
2146 if (!should_apply_static_reloc(gsym
, Symbol::ABSOLUTE_REF
, true,
2151 // Get the addressing origin of the output segment defining
2152 // the symbol gsym (AAELF 4.6.1.2 Relocation types).
2154 // R_ARM_BASE_ABS with the NULL symbol will give the
2155 // absolute address of the GOT origin (GOT_ORG) (see ARM IHI
2156 // 0044C (AAELF): 4.6.1.8 Proxy generating relocations).
2157 origin
= target
->got_plt_section()->address();
2158 else if (gsym
->source() == Symbol::IN_OUTPUT_SEGMENT
)
2159 origin
= gsym
->output_segment()->vaddr();
2160 else if (gsym
->source () == Symbol::IN_OUTPUT_DATA
)
2161 origin
= gsym
->output_data()->address();
2164 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2165 _("cannot find origin of R_ARM_BASE_ABS"));
2169 reloc_status
= Arm_relocate_functions::base_abs(view
, origin
);
2173 case elfcpp::R_ARM_GOT_BREL
:
2174 gold_assert(have_got_offset
);
2175 reloc_status
= Arm_relocate_functions::got_brel(view
, got_offset
);
2178 case elfcpp::R_ARM_GOT_PREL
:
2179 gold_assert(have_got_offset
);
2180 // Get the address origin for GOT PLT, which is allocated right
2181 // after the GOT section, to calculate an absolute address of
2182 // the symbol GOT entry (got_origin + got_offset).
2183 elfcpp::Elf_types
<32>::Elf_Addr got_origin
;
2184 got_origin
= target
->got_plt_section()->address();
2185 reloc_status
= Arm_relocate_functions::got_prel(view
,
2186 got_origin
+ got_offset
,
2190 case elfcpp::R_ARM_PLT32
:
2191 gold_assert(gsym
== NULL
2192 || gsym
->has_plt_offset()
2193 || gsym
->final_value_is_known()
2194 || (gsym
->is_defined()
2195 && !gsym
->is_from_dynobj()
2196 && !gsym
->is_preemptible()));
2197 reloc_status
= Arm_relocate_functions::plt32(view
, object
, psymval
,
2198 address
, has_thumb_bit
);
2201 case elfcpp::R_ARM_CALL
:
2202 reloc_status
= Arm_relocate_functions::call(view
, object
, psymval
,
2203 address
, has_thumb_bit
);
2206 case elfcpp::R_ARM_JUMP24
:
2207 reloc_status
= Arm_relocate_functions::jump24(view
, object
, psymval
,
2208 address
, has_thumb_bit
);
2211 case elfcpp::R_ARM_PREL31
:
2212 reloc_status
= Arm_relocate_functions::prel31(view
, object
, psymval
,
2213 address
, has_thumb_bit
);
2216 case elfcpp::R_ARM_TARGET1
:
2217 // This should have been mapped to another type already.
2219 case elfcpp::R_ARM_COPY
:
2220 case elfcpp::R_ARM_GLOB_DAT
:
2221 case elfcpp::R_ARM_JUMP_SLOT
:
2222 case elfcpp::R_ARM_RELATIVE
:
2223 // These are relocations which should only be seen by the
2224 // dynamic linker, and should never be seen here.
2225 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2226 _("unexpected reloc %u in object file"),
2231 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2232 _("unsupported reloc %u"),
2237 // Report any errors.
2238 switch (reloc_status
)
2240 case Arm_relocate_functions::STATUS_OKAY
:
2242 case Arm_relocate_functions::STATUS_OVERFLOW
:
2243 gold_error_at_location(relinfo
, relnum
, rel
.get_r_offset(),
2244 _("relocation overflow in relocation %u"),
2247 case Arm_relocate_functions::STATUS_BAD_RELOC
:
2248 gold_error_at_location(
2252 _("unexpected opcode while processing relocation %u"),
2262 // Relocate section data.
2264 template<bool big_endian
>
2266 Target_arm
<big_endian
>::relocate_section(
2267 const Relocate_info
<32, big_endian
>* relinfo
,
2268 unsigned int sh_type
,
2269 const unsigned char* prelocs
,
2271 Output_section
* output_section
,
2272 bool needs_special_offset_handling
,
2273 unsigned char* view
,
2274 elfcpp::Elf_types
<32>::Elf_Addr address
,
2275 section_size_type view_size
,
2276 const Reloc_symbol_changes
* reloc_symbol_changes
)
2278 typedef typename Target_arm
<big_endian
>::Relocate Arm_relocate
;
2279 gold_assert(sh_type
== elfcpp::SHT_REL
);
2281 gold::relocate_section
<32, big_endian
, Target_arm
, elfcpp::SHT_REL
,
2288 needs_special_offset_handling
,
2292 reloc_symbol_changes
);
2295 // Return the size of a relocation while scanning during a relocatable
2298 template<bool big_endian
>
2300 Target_arm
<big_endian
>::Relocatable_size_for_reloc::get_size_for_reloc(
2301 unsigned int r_type
,
2304 r_type
= get_real_reloc_type(r_type
);
2307 case elfcpp::R_ARM_NONE
:
2310 case elfcpp::R_ARM_ABS8
:
2313 case elfcpp::R_ARM_ABS16
:
2314 case elfcpp::R_ARM_THM_ABS5
:
2317 case elfcpp::R_ARM_ABS32
:
2318 case elfcpp::R_ARM_ABS32_NOI
:
2319 case elfcpp::R_ARM_ABS12
:
2320 case elfcpp::R_ARM_BASE_ABS
:
2321 case elfcpp::R_ARM_REL32
:
2322 case elfcpp::R_ARM_THM_CALL
:
2323 case elfcpp::R_ARM_GOTOFF32
:
2324 case elfcpp::R_ARM_BASE_PREL
:
2325 case elfcpp::R_ARM_GOT_BREL
:
2326 case elfcpp::R_ARM_GOT_PREL
:
2327 case elfcpp::R_ARM_PLT32
:
2328 case elfcpp::R_ARM_CALL
:
2329 case elfcpp::R_ARM_JUMP24
:
2330 case elfcpp::R_ARM_PREL31
:
2331 case elfcpp::R_ARM_MOVW_ABS_NC
:
2332 case elfcpp::R_ARM_MOVT_ABS
:
2333 case elfcpp::R_ARM_THM_MOVW_ABS_NC
:
2334 case elfcpp::R_ARM_THM_MOVT_ABS
:
2335 case elfcpp::R_ARM_MOVW_PREL_NC
:
2336 case elfcpp::R_ARM_MOVT_PREL
:
2337 case elfcpp::R_ARM_THM_MOVW_PREL_NC
:
2338 case elfcpp::R_ARM_THM_MOVT_PREL
:
2341 case elfcpp::R_ARM_TARGET1
:
2342 // This should have been mapped to another type already.
2344 case elfcpp::R_ARM_COPY
:
2345 case elfcpp::R_ARM_GLOB_DAT
:
2346 case elfcpp::R_ARM_JUMP_SLOT
:
2347 case elfcpp::R_ARM_RELATIVE
:
2348 // These are relocations which should only be seen by the
2349 // dynamic linker, and should never be seen here.
2350 gold_error(_("%s: unexpected reloc %u in object file"),
2351 object
->name().c_str(), r_type
);
2355 object
->error(_("unsupported reloc %u in object file"), r_type
);
2360 // Scan the relocs during a relocatable link.
2362 template<bool big_endian
>
2364 Target_arm
<big_endian
>::scan_relocatable_relocs(
2365 const General_options
& options
,
2366 Symbol_table
* symtab
,
2368 Sized_relobj
<32, big_endian
>* object
,
2369 unsigned int data_shndx
,
2370 unsigned int sh_type
,
2371 const unsigned char* prelocs
,
2373 Output_section
* output_section
,
2374 bool needs_special_offset_handling
,
2375 size_t local_symbol_count
,
2376 const unsigned char* plocal_symbols
,
2377 Relocatable_relocs
* rr
)
2379 gold_assert(sh_type
== elfcpp::SHT_REL
);
2381 typedef gold::Default_scan_relocatable_relocs
<elfcpp::SHT_REL
,
2382 Relocatable_size_for_reloc
> Scan_relocatable_relocs
;
2384 gold::scan_relocatable_relocs
<32, big_endian
, elfcpp::SHT_REL
,
2385 Scan_relocatable_relocs
>(
2394 needs_special_offset_handling
,
2400 // Relocate a section during a relocatable link.
2402 template<bool big_endian
>
2404 Target_arm
<big_endian
>::relocate_for_relocatable(
2405 const Relocate_info
<32, big_endian
>* relinfo
,
2406 unsigned int sh_type
,
2407 const unsigned char* prelocs
,
2409 Output_section
* output_section
,
2410 off_t offset_in_output_section
,
2411 const Relocatable_relocs
* rr
,
2412 unsigned char* view
,
2413 elfcpp::Elf_types
<32>::Elf_Addr view_address
,
2414 section_size_type view_size
,
2415 unsigned char* reloc_view
,
2416 section_size_type reloc_view_size
)
2418 gold_assert(sh_type
== elfcpp::SHT_REL
);
2420 gold::relocate_for_relocatable
<32, big_endian
, elfcpp::SHT_REL
>(
2425 offset_in_output_section
,
2434 // Return the value to use for a dynamic symbol which requires special
2435 // treatment. This is how we support equality comparisons of function
2436 // pointers across shared library boundaries, as described in the
2437 // processor specific ABI supplement.
2439 template<bool big_endian
>
2441 Target_arm
<big_endian
>::do_dynsym_value(const Symbol
* gsym
) const
2443 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
2444 return this->plt_section()->address() + gsym
->plt_offset();
2447 // Map platform-specific relocs to real relocs
2449 template<bool big_endian
>
2451 Target_arm
<big_endian
>::get_real_reloc_type (unsigned int r_type
)
2455 case elfcpp::R_ARM_TARGET1
:
2456 // This is either R_ARM_ABS32 or R_ARM_REL32;
2457 return elfcpp::R_ARM_ABS32
;
2459 case elfcpp::R_ARM_TARGET2
:
2460 // This can be any reloc type but ususally is R_ARM_GOT_PREL
2461 return elfcpp::R_ARM_GOT_PREL
;
2468 // The selector for arm object files.
2470 template<bool big_endian
>
2471 class Target_selector_arm
: public Target_selector
2474 Target_selector_arm()
2475 : Target_selector(elfcpp::EM_ARM
, 32, big_endian
,
2476 (big_endian
? "elf32-bigarm" : "elf32-littlearm"))
2480 do_instantiate_target()
2481 { return new Target_arm
<big_endian
>(); }
2484 Target_selector_arm
<false> target_selector_arm
;
2485 Target_selector_arm
<true> target_selector_armbe
;
2487 } // End anonymous namespace.