1 /* ARC-specific support for 32-bit ELF
2 Copyright (C) 1994-2016 Free Software Foundation, Inc.
3 Contributed by Cupertino Miranda (cmiranda@synopsys.com).
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
27 #include "libiberty.h"
28 #include "opcode/arc-func.h"
29 #include "opcode/arc.h"
32 /* #define ARC_ENABLE_DEBUG 1 */
33 #ifdef ARC_ENABLE_DEBUG
35 name_for_global_symbol (struct elf_link_hash_entry *h)
37 static char *local_str = "(local)";
40 return h->root.root.string;
42 #define ARC_DEBUG(fmt, args...) fprintf (stderr, fmt, ##args)
44 #define ARC_DEBUG(...)
48 #define ADD_RELA(BFD, SECTION, OFFSET, SYM_IDX, TYPE, ADDEND) \
50 struct elf_link_hash_table *_htab = elf_hash_table (info); \
51 Elf_Internal_Rela _rel; \
54 BFD_ASSERT (_htab->srel##SECTION &&_htab->srel##SECTION->contents); \
55 _loc = _htab->srel##SECTION->contents \
56 + ((_htab->srel##SECTION->reloc_count) \
57 * sizeof (Elf32_External_Rela)); \
58 _htab->srel##SECTION->reloc_count++; \
59 _rel.r_addend = ADDEND; \
60 _rel.r_offset = (_htab->s##SECTION)->output_section->vma \
61 + (_htab->s##SECTION)->output_offset + OFFSET; \
62 BFD_ASSERT ((long) SYM_IDX != -1); \
63 _rel.r_info = ELF32_R_INFO (SYM_IDX, TYPE); \
64 bfd_elf32_swap_reloca_out (BFD, &_rel, _loc); \
67 struct dynamic_sections
69 bfd_boolean initialized;
73 asection * srelgotplt;
79 enum dyn_section_types
90 const char * dyn_section_names[DYN_SECTION_TYPES_END] =
101 /* The default symbols representing the init and fini dyn values.
102 TODO: Check what is the relation of those strings with arclinux.em
104 #define INIT_SYM_STRING "_init"
105 #define FINI_SYM_STRING "_fini"
107 char * init_str = INIT_SYM_STRING;
108 char * fini_str = FINI_SYM_STRING;
110 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
115 static ATTRIBUTE_UNUSED const char *
116 reloc_type_to_name (unsigned int type)
120 #include "elf/arc-reloc.def"
127 #undef ARC_RELOC_HOWTO
129 /* Try to minimize the amount of space occupied by relocation tables
130 on the ROM (not that the ROM won't be swamped by other ELF overhead). */
134 static ATTRIBUTE_UNUSED bfd_boolean
135 is_reloc_PC_relative (reloc_howto_type *howto)
137 return (strstr (howto->name, "PC") != NULL) ? TRUE : FALSE;
141 is_reloc_SDA_relative (reloc_howto_type *howto)
143 return (strstr (howto->name, "SDA") != NULL) ? TRUE : FALSE;
147 is_reloc_for_GOT (reloc_howto_type * howto)
149 if (strstr (howto->name, "TLS") != NULL)
151 return (strstr (howto->name, "GOT") != NULL) ? TRUE : FALSE;
155 is_reloc_for_PLT (reloc_howto_type * howto)
157 return (strstr (howto->name, "PLT") != NULL) ? TRUE : FALSE;
161 is_reloc_for_TLS (reloc_howto_type *howto)
163 return (strstr (howto->name, "TLS") != NULL) ? TRUE : FALSE;
166 struct arc_relocation_data
168 bfd_signed_vma reloc_offset;
169 bfd_signed_vma reloc_addend;
170 bfd_signed_vma got_offset_value;
172 bfd_signed_vma sym_value;
173 asection * sym_section;
175 reloc_howto_type *howto;
177 asection * input_section;
179 bfd_signed_vma sdata_begin_symbol_vma;
180 bfd_boolean sdata_begin_symbol_vma_set;
181 bfd_signed_vma got_symbol_vma;
183 bfd_boolean should_relocate;
185 const char * symbol_name;
188 /* Should be included at this location due to static declarations
189 * defined before this point. */
192 #define arc_bfd_get_8(A,B,C) bfd_get_8(A,B)
193 #define arc_bfd_get_16(A,B,C) bfd_get_16(A,B)
194 #define arc_bfd_get_32(A,B,C) bfd_get_32(A,B)
195 #define arc_bfd_put_8(A,B,C,D) bfd_put_8(A,B,C)
196 #define arc_bfd_put_16(A,B,C,D) bfd_put_16(A,B,C)
197 #define arc_bfd_put_32(A,B,C,D) bfd_put_32(A,B,C)
200 static bfd_reloc_status_type
201 arc_elf_reloc (bfd *abfd ATTRIBUTE_UNUSED,
202 arelent *reloc_entry,
204 void *data ATTRIBUTE_UNUSED,
205 asection *input_section,
207 char ** error_message ATTRIBUTE_UNUSED)
209 if (output_bfd != NULL)
211 reloc_entry->address += input_section->output_offset;
213 /* In case of relocateable link and if the reloc is against a
214 section symbol, the addend needs to be adjusted according to
215 where the section symbol winds up in the output section. */
216 if ((symbol_in->flags & BSF_SECTION_SYM) && symbol_in->section)
217 reloc_entry->addend += symbol_in->section->output_offset;
222 return bfd_reloc_continue;
226 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
230 #include "elf/arc-reloc.def"
233 #undef ARC_RELOC_HOWTO
235 #define ARC_RELOC_HOWTO(TYPE, VALUE, RSIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
236 [TYPE] = HOWTO (R_##TYPE, 0, RSIZE, BITSIZE, FALSE, 0, \
237 complain_overflow_##OVERFLOW, arc_elf_reloc, \
238 "R_" #TYPE, FALSE, 0, 0, FALSE),
240 static struct reloc_howto_struct elf_arc_howto_table[] =
242 #include "elf/arc-reloc.def"
243 /* Example of what is generated by the preprocessor. Currently kept as an
245 HOWTO (R_ARC_NONE, // Type.
247 2, // Size (0 = byte, 1 = short, 2 = long).
249 FALSE, // PC_relative.
251 complain_overflow_bitfield, // Complain_on_overflow.
252 bfd_elf_generic_reloc, // Special_function.
253 "R_ARC_NONE", // Name.
254 TRUE, // Partial_inplace.
257 FALSE), // PCrel_offset.
260 #undef ARC_RELOC_HOWTO
262 static void arc_elf_howto_init (void)
264 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
265 elf_arc_howto_table[TYPE].pc_relative = \
266 (strstr (#FORMULA, " P ") != NULL || strstr (#FORMULA, " PDATA ") != NULL); \
267 elf_arc_howto_table[TYPE].dst_mask = RELOC_FUNCTION(0, ~0); \
268 /* Only 32 bit data relocations should be marked as ME. */ \
269 if (strstr (#FORMULA, " ME ") != NULL) \
271 BFD_ASSERT (SIZE == 2); \
274 #include "elf/arc-reloc.def"
277 #undef ARC_RELOC_HOWTO
280 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
282 const int howto_table_lookup[] =
284 #include "elf/arc-reloc.def"
286 #undef ARC_RELOC_HOWTO
288 static reloc_howto_type *
289 arc_elf_howto (unsigned int r_type)
291 if (elf_arc_howto_table[R_ARC_32].dst_mask == 0)
292 arc_elf_howto_init ();
293 return &elf_arc_howto_table[r_type];
296 /* Map BFD reloc types to ARC ELF reloc types. */
300 bfd_reloc_code_real_type bfd_reloc_val;
301 unsigned char elf_reloc_val;
304 /* ARC ELF linker hash entry. */
305 struct elf_arc_link_hash_entry
307 struct elf_link_hash_entry root;
309 /* Track dynamic relocs copied for this symbol. */
310 struct elf_dyn_relocs *dyn_relocs;
313 /* ARC ELF linker hash table. */
314 struct elf_arc_link_hash_table
316 struct elf_link_hash_table elf;
318 /* Short-cuts to get to dynamic linker sections. */
322 static struct bfd_hash_entry *
323 elf_arc_link_hash_newfunc (struct bfd_hash_entry *entry,
324 struct bfd_hash_table *table,
327 /* Allocate the structure if it has not already been allocated by a
331 entry = (struct bfd_hash_entry *)
332 bfd_hash_allocate (table,
333 sizeof (struct elf_arc_link_hash_entry));
338 /* Call the allocation method of the superclass. */
339 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
342 struct elf_arc_link_hash_entry *eh;
344 eh = (struct elf_arc_link_hash_entry *) entry;
345 eh->dyn_relocs = NULL;
351 /* Destroy an ARC ELF linker hash table. */
353 elf_arc_link_hash_table_free (bfd *obfd)
355 _bfd_elf_link_hash_table_free (obfd);
358 /* Create an ARC ELF linker hash table. */
360 static struct bfd_link_hash_table *
361 arc_elf_link_hash_table_create (bfd *abfd)
363 struct elf_arc_link_hash_table *ret;
365 ret = (struct elf_arc_link_hash_table *) bfd_zmalloc (sizeof (*ret));
369 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
370 elf_arc_link_hash_newfunc,
371 sizeof (struct elf_arc_link_hash_entry),
380 ret->elf.init_got_refcount.refcount = 0;
381 ret->elf.init_got_refcount.glist = NULL;
382 ret->elf.init_got_offset.offset = 0;
383 ret->elf.init_got_offset.glist = NULL;
385 ret->elf.root.hash_table_free = elf_arc_link_hash_table_free;
387 return &ret->elf.root;
390 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
391 { BFD_RELOC_##TYPE, R_##TYPE },
392 static const struct arc_reloc_map arc_reloc_map[] =
394 #include "elf/arc-reloc.def"
396 {BFD_RELOC_NONE, R_ARC_NONE},
397 {BFD_RELOC_8, R_ARC_8},
398 {BFD_RELOC_16, R_ARC_16},
399 {BFD_RELOC_24, R_ARC_24},
400 {BFD_RELOC_32, R_ARC_32},
402 #undef ARC_RELOC_HOWTO
404 typedef ATTRIBUTE_UNUSED bfd_vma (*replace_func) (unsigned, int ATTRIBUTE_UNUSED);
406 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
408 func = (void *) RELOC_FUNCTION; \
411 get_replace_function (bfd *abfd, unsigned int r_type)
417 #include "elf/arc-reloc.def"
420 if (func == replace_bits24 && bfd_big_endian (abfd))
421 return (replace_func) replace_bits24_be;
423 return (replace_func) func;
425 #undef ARC_RELOC_HOWTO
427 static reloc_howto_type *
428 arc_elf32_bfd_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
429 bfd_reloc_code_real_type code)
433 for (i = ARRAY_SIZE (arc_reloc_map); i--;)
435 if (arc_reloc_map[i].bfd_reloc_val == code)
436 return arc_elf_howto (arc_reloc_map[i].elf_reloc_val);
442 /* Function to set the ELF flag bits. */
444 arc_elf_set_private_flags (bfd *abfd, flagword flags)
446 elf_elfheader (abfd)->e_flags = flags;
447 elf_flags_init (abfd) = TRUE;
451 /* Print private flags. */
453 arc_elf_print_private_bfd_data (bfd *abfd, void * ptr)
455 FILE *file = (FILE *) ptr;
458 BFD_ASSERT (abfd != NULL && ptr != NULL);
460 /* Print normal ELF private data. */
461 _bfd_elf_print_private_bfd_data (abfd, ptr);
463 flags = elf_elfheader (abfd)->e_flags;
464 fprintf (file, _("private flags = 0x%lx:"), (unsigned long) flags);
466 switch (flags & EF_ARC_MACH_MSK)
468 case EF_ARC_CPU_ARCV2HS : fprintf (file, " -mcpu=ARCv2HS"); break;
469 case EF_ARC_CPU_ARCV2EM : fprintf (file, " -mcpu=ARCv2EM"); break;
470 case E_ARC_MACH_ARC600 : fprintf (file, " -mcpu=ARC600"); break;
471 case E_ARC_MACH_ARC601 : fprintf (file, " -mcpu=ARC601"); break;
472 case E_ARC_MACH_ARC700 : fprintf (file, " -mcpu=ARC700"); break;
474 fprintf (file, "-mcpu=unknown");
478 switch (flags & EF_ARC_OSABI_MSK)
480 case E_ARC_OSABI_ORIG : fprintf (file, " (ABI:legacy)"); break;
481 case E_ARC_OSABI_V2 : fprintf (file, " (ABI:v2)"); break;
482 case E_ARC_OSABI_V3 : fprintf (file, " (ABI:v3)"); break;
484 fprintf (file, "(ABI:unknown)");
492 /* Copy backend specific data from one object module to another. */
495 arc_elf_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
497 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
498 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
501 BFD_ASSERT (!elf_flags_init (obfd)
502 || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags);
504 elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
505 elf_flags_init (obfd) = TRUE;
507 /* Copy object attributes. */
508 _bfd_elf_copy_obj_attributes (ibfd, obfd);
510 return _bfd_elf_copy_private_bfd_data (ibfd, obfd);
513 static reloc_howto_type *
514 bfd_elf32_bfd_reloc_name_lookup (bfd * abfd ATTRIBUTE_UNUSED,
519 for (i = 0; i < ARRAY_SIZE (elf_arc_howto_table); i++)
520 if (elf_arc_howto_table[i].name != NULL
521 && strcasecmp (elf_arc_howto_table[i].name, r_name) == 0)
522 return arc_elf_howto (i);
527 /* Set the howto pointer for an ARC ELF reloc. */
530 arc_info_to_howto_rel (bfd * abfd ATTRIBUTE_UNUSED,
532 Elf_Internal_Rela * dst)
536 r_type = ELF32_R_TYPE (dst->r_info);
537 BFD_ASSERT (r_type < (unsigned int) R_ARC_max);
538 cache_ptr->howto = arc_elf_howto (r_type);
541 /* Merge backend specific data from an object file to the output
542 object file when linking. */
545 arc_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
547 unsigned short mach_ibfd;
548 static unsigned short mach_obfd = EM_NONE;
553 /* Check if we have the same endianess. */
554 if (! _bfd_generic_verify_endian_match (ibfd, obfd))
556 _bfd_error_handler (_("ERROR: Endian Match failed. Attempting to link "
557 "%B with binary %s of opposite endian-ness"),
558 ibfd, bfd_get_filename (obfd));
562 /* Collect ELF flags. */
563 in_flags = elf_elfheader (ibfd)->e_flags & EF_ARC_MACH_MSK;
564 out_flags = elf_elfheader (obfd)->e_flags & EF_ARC_MACH_MSK;
566 if (!elf_flags_init (obfd)) /* First call, no flags set. */
568 elf_flags_init (obfd) = TRUE;
569 out_flags = in_flags;
572 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
573 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
576 /* Check to see if the input BFD actually contains any sections. Do
577 not short-circuit dynamic objects; their section list may be
578 emptied by elf_link_add_object_symbols. */
579 if (!(ibfd->flags & DYNAMIC))
581 bfd_boolean null_input_bfd = TRUE;
582 bfd_boolean only_data_sections = TRUE;
584 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
586 if ((bfd_get_section_flags (ibfd, sec)
587 & (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
588 == (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
589 only_data_sections = FALSE;
591 null_input_bfd = FALSE;
594 if (null_input_bfd || only_data_sections)
598 /* Complain about various flag/architecture mismatches. */
599 mach_ibfd = elf_elfheader (ibfd)->e_machine;
600 if (mach_obfd == EM_NONE)
602 mach_obfd = mach_ibfd;
606 if (mach_ibfd != mach_obfd)
608 _bfd_error_handler (_("ERROR: Attempting to link %B "
609 "with a binary %s of different architecture"),
610 ibfd, bfd_get_filename (obfd));
613 else if (in_flags != out_flags)
615 /* Warn if different flags. */
617 (_("%s: uses different e_flags (0x%lx) fields than "
618 "previous modules (0x%lx)"),
619 bfd_get_filename (ibfd), (long)in_flags, (long)out_flags);
620 if (in_flags && out_flags)
622 /* MWDT doesnt set the eflags hence make sure we choose the
623 eflags set by gcc. */
624 in_flags = in_flags > out_flags ? in_flags : out_flags;
628 /* Update the flags. */
629 elf_elfheader (obfd)->e_flags = in_flags;
631 if (bfd_get_mach (obfd) < bfd_get_mach (ibfd))
633 return bfd_set_arch_mach (obfd, bfd_arch_arc, bfd_get_mach (ibfd));
639 /* Set the right machine number for an ARC ELF file. */
641 arc_elf_object_p (bfd * abfd)
643 /* Make sure this is initialised, or you'll have the potential of passing
644 garbage---or misleading values---into the call to
645 bfd_default_set_arch_mach (). */
646 int mach = bfd_mach_arc_arc700;
647 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH_MSK;
648 unsigned e_machine = elf_elfheader (abfd)->e_machine;
650 if (e_machine == EM_ARC_COMPACT || e_machine == EM_ARC_COMPACT2)
654 case E_ARC_MACH_ARC600:
655 mach = bfd_mach_arc_arc600;
657 case E_ARC_MACH_ARC601:
658 mach = bfd_mach_arc_arc601;
660 case E_ARC_MACH_ARC700:
661 mach = bfd_mach_arc_arc700;
663 case EF_ARC_CPU_ARCV2HS:
664 case EF_ARC_CPU_ARCV2EM:
665 mach = bfd_mach_arc_arcv2;
668 mach = (e_machine == EM_ARC_COMPACT)
669 ? bfd_mach_arc_arc700 : bfd_mach_arc_arcv2;
675 if (e_machine == EM_ARC)
678 (_("Error: The ARC4 architecture is no longer supported.\n"));
684 (_("Warning: unset or old architecture flags. \n"
685 " Use default machine.\n"));
689 return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
692 /* The final processing done just before writing out an ARC ELF object file.
693 This gets the ARC architecture right based on the machine number. */
696 arc_elf_final_write_processing (bfd * abfd,
697 bfd_boolean linker ATTRIBUTE_UNUSED)
701 switch (bfd_get_mach (abfd))
703 case bfd_mach_arc_arc600:
704 emf = EM_ARC_COMPACT;
706 case bfd_mach_arc_arc601:
707 emf = EM_ARC_COMPACT;
709 case bfd_mach_arc_arc700:
710 emf = EM_ARC_COMPACT;
712 case bfd_mach_arc_arcv2:
713 emf = EM_ARC_COMPACT2;
719 elf_elfheader (abfd)->e_machine = emf;
721 /* Record whatever is the current syscall ABI version. */
722 elf_elfheader (abfd)->e_flags |= E_ARC_OSABI_CURRENT;
728 #ifdef ARC_ENABLE_DEBUG
729 #define DEBUG_ARC_RELOC(A) debug_arc_reloc (A)
732 debug_arc_reloc (struct arc_relocation_data reloc_data)
734 ARC_DEBUG ("Reloc type=%s, should_relocate = %s\n",
735 reloc_data.howto->name,
736 reloc_data.should_relocate ? "true" : "false");
737 ARC_DEBUG (" offset = 0x%x, addend = 0x%x\n",
738 (unsigned int) reloc_data.reloc_offset,
739 (unsigned int) reloc_data.reloc_addend);
740 ARC_DEBUG (" Symbol:\n");
741 ARC_DEBUG (" value = 0x%08x\n",
742 (unsigned int) reloc_data.sym_value);
743 if (reloc_data.sym_section != NULL)
745 ARC_DEBUG (" Symbol Section:\n");
746 ARC_DEBUG (" section name = %s, output_offset 0x%08x",
747 reloc_data.sym_section->name,
748 (unsigned int) reloc_data.sym_section->output_offset);
749 if (reloc_data.sym_section->output_section != NULL)
750 ARC_DEBUG (", output_section->vma = 0x%08x",
751 ((unsigned int) reloc_data.sym_section->output_section->vma));
753 if (reloc_data.sym_section->owner && reloc_data.sym_section->owner->filename)
754 ARC_DEBUG (" file: %s\n", reloc_data.sym_section->owner->filename);
758 ARC_DEBUG (" symbol section is NULL\n");
761 ARC_DEBUG (" Input_section:\n");
762 if (reloc_data.input_section != NULL)
764 ARC_DEBUG (" section name = %s, output_offset 0x%08x, output_section->vma = 0x%08x\n",
765 reloc_data.input_section->name,
766 (unsigned int) reloc_data.input_section->output_offset,
767 (unsigned int) reloc_data.input_section->output_section->vma);
768 ARC_DEBUG (" changed_address = 0x%08x\n",
769 (unsigned int) (reloc_data.input_section->output_section->vma
770 + reloc_data.input_section->output_offset
771 + reloc_data.reloc_offset));
772 ARC_DEBUG (" file: %s\n", reloc_data.input_section->owner->filename);
776 ARC_DEBUG (" input section is NULL\n");
780 #define DEBUG_ARC_RELOC(A)
781 #endif /* ARC_ENABLE_DEBUG */
784 middle_endian_convert (bfd_vma insn, bfd_boolean do_it)
789 = ((insn & 0xffff0000) >> 16)
790 | ((insn & 0xffff) << 16);
795 /* This function is called for relocations that are otherwise marked as NOT
796 requiring overflow checks. In here we perform non-standard checks of
797 the relocation value. */
799 static inline bfd_reloc_status_type
800 arc_special_overflow_checks (const struct arc_relocation_data reloc_data,
801 bfd_signed_vma relocation,
802 struct bfd_link_info *info ATTRIBUTE_UNUSED)
804 switch (reloc_data.howto->type)
806 case R_ARC_NPS_CMEM16:
807 if (((relocation >> 16) & 0xffff) != NPS_CMEM_HIGH_VALUE)
809 if (reloc_data.reloc_addend == 0)
811 (_("%B(%A+0x%lx): CMEM relocation to `%s' is invalid, "
812 "16 MSB should be 0x%04x (value is 0x%lx)"),
813 reloc_data.input_section->owner,
814 reloc_data.input_section,
815 reloc_data.reloc_offset,
816 reloc_data.symbol_name,
821 (_("%B(%A+0x%lx): CMEM relocation to `%s+0x%lx' is invalid, "
822 "16 MSB should be 0x%04x (value is 0x%lx)"),
823 reloc_data.input_section->owner,
824 reloc_data.input_section,
825 reloc_data.reloc_offset,
826 reloc_data.symbol_name,
827 reloc_data.reloc_addend,
830 return bfd_reloc_overflow;
841 #define ME(reloc) (reloc)
843 #define IS_ME(FORMULA,BFD) ((strstr (FORMULA, "ME") != NULL) \
844 && (!bfd_big_endian (BFD)))
846 #define S ((bfd_signed_vma) (reloc_data.sym_value \
847 + (reloc_data.sym_section->output_section != NULL ? \
848 (reloc_data.sym_section->output_offset \
849 + reloc_data.sym_section->output_section->vma) : 0)))
850 #define L ((bfd_signed_vma) (reloc_data.sym_value \
851 + (reloc_data.sym_section->output_section != NULL ? \
852 (reloc_data.sym_section->output_offset \
853 + reloc_data.sym_section->output_section->vma) : 0)))
854 #define A (reloc_data.reloc_addend)
856 #define G (reloc_data.got_offset_value)
857 #define GOT (reloc_data.got_symbol_vma)
858 #define GOT_BEGIN (htab->sgot->output_section->vma)
861 /* P: relative offset to PCL The offset should be to the
862 current location aligned to 32 bits. */
863 #define P ((bfd_signed_vma) ( \
865 (reloc_data.input_section->output_section != NULL ? \
866 reloc_data.input_section->output_section->vma : 0) \
867 + reloc_data.input_section->output_offset \
868 + (reloc_data.reloc_offset - (bitsize >= 32 ? 4 : 0))) \
870 #define PDATA ((bfd_signed_vma) ( \
871 (reloc_data.input_section->output_section->vma \
872 + reloc_data.input_section->output_offset \
873 + (reloc_data.reloc_offset))))
874 #define SECTSTART (bfd_signed_vma) (reloc_data.sym_section->output_section->vma \
875 + reloc_data.sym_section->output_offset)
877 #define _SDA_BASE_ (bfd_signed_vma) (reloc_data.sdata_begin_symbol_vma)
878 #define TLS_REL (bfd_signed_vma) \
879 ((elf_hash_table (info))->tls_sec->output_section->vma)
885 #ifdef ARC_ENABLE_DEBUG
886 #define PRINT_DEBUG_RELOC_INFO_BEFORE(FORMULA, TYPE) \
889 asection *sym_section = reloc_data.sym_section; \
890 asection *input_section = reloc_data.input_section; \
891 ARC_DEBUG ("RELOC_TYPE = " TYPE "\n"); \
892 ARC_DEBUG ("FORMULA = " FORMULA "\n"); \
893 ARC_DEBUG ("S = %#lx\n", S); \
894 ARC_DEBUG ("A = %#lx\n", A); \
895 ARC_DEBUG ("L = %lx\n", L); \
896 if (sym_section->output_section != NULL) \
897 ARC_DEBUG ("symbol_section->vma = %#lx\n", \
898 sym_section->output_section->vma \
899 + sym_section->output_offset); \
901 ARC_DEBUG ("symbol_section->vma = NULL\n"); \
902 if (input_section->output_section != NULL) \
903 ARC_DEBUG ("symbol_section->vma = %#lx\n", \
904 input_section->output_section->vma \
905 + input_section->output_offset); \
907 ARC_DEBUG ("symbol_section->vma = NULL\n"); \
908 ARC_DEBUG ("PCL = %#lx\n", P); \
909 ARC_DEBUG ("P = %#lx\n", P); \
910 ARC_DEBUG ("G = %#lx\n", G); \
911 ARC_DEBUG ("SDA_OFFSET = %#lx\n", _SDA_BASE_); \
912 ARC_DEBUG ("SDA_SET = %d\n", reloc_data.sdata_begin_symbol_vma_set); \
913 ARC_DEBUG ("GOT_OFFSET = %#lx\n", GOT); \
914 ARC_DEBUG ("relocation = %#08lx\n", relocation); \
915 ARC_DEBUG ("before = %#08x\n", (unsigned) insn); \
916 ARC_DEBUG ("data = %08x (%u) (%d)\n", (unsigned) relocation, \
917 (unsigned) relocation, (int) relocation); \
921 #define PRINT_DEBUG_RELOC_INFO_AFTER \
924 ARC_DEBUG ("after = 0x%08x\n", (unsigned int) insn); \
930 #define PRINT_DEBUG_RELOC_INFO_BEFORE(...)
931 #define PRINT_DEBUG_RELOC_INFO_AFTER
933 #endif /* ARC_ENABLE_DEBUG */
935 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
938 bfd_signed_vma bitsize ATTRIBUTE_UNUSED = BITSIZE; \
939 relocation = FORMULA ; \
940 PRINT_DEBUG_RELOC_INFO_BEFORE (#FORMULA, #TYPE); \
941 insn = middle_endian_convert (insn, IS_ME (#FORMULA, abfd)); \
942 insn = (* get_replace_function (abfd, TYPE)) (insn, relocation); \
943 insn = middle_endian_convert (insn, IS_ME (#FORMULA, abfd)); \
944 PRINT_DEBUG_RELOC_INFO_AFTER; \
948 static bfd_reloc_status_type
949 arc_do_relocation (bfd_byte * contents,
950 struct arc_relocation_data reloc_data,
951 struct bfd_link_info *info)
953 bfd_signed_vma relocation = 0;
955 bfd_vma orig_insn ATTRIBUTE_UNUSED;
956 bfd * abfd = reloc_data.input_section->owner;
957 struct elf_link_hash_table *htab ATTRIBUTE_UNUSED = elf_hash_table (info);
958 bfd_reloc_status_type flag;
960 if (reloc_data.should_relocate == FALSE)
963 switch (reloc_data.howto->size)
966 insn = arc_bfd_get_32 (abfd,
967 contents + reloc_data.reloc_offset,
968 reloc_data.input_section);
971 insn = arc_bfd_get_16 (abfd,
972 contents + reloc_data.reloc_offset,
973 reloc_data.input_section);
976 insn = arc_bfd_get_8 (abfd,
977 contents + reloc_data.reloc_offset,
978 reloc_data.input_section);
988 switch (reloc_data.howto->type)
990 #include "elf/arc-reloc.def"
997 /* Check for relocation overflow. */
998 if (reloc_data.howto->complain_on_overflow != complain_overflow_dont)
999 flag = bfd_check_overflow (reloc_data.howto->complain_on_overflow,
1000 reloc_data.howto->bitsize,
1001 reloc_data.howto->rightshift,
1002 bfd_arch_bits_per_address (abfd),
1005 flag = arc_special_overflow_checks (reloc_data, relocation, info);
1007 if (flag != bfd_reloc_ok)
1009 ARC_DEBUG ("Relocation overflows !\n");
1010 DEBUG_ARC_RELOC (reloc_data);
1011 ARC_DEBUG ("Relocation value = signed -> %d, unsigned -> %u"
1012 ", hex -> (0x%08x)\n",
1013 (int) relocation, (unsigned) relocation, (int) relocation);
1018 /* Write updated instruction back to memory. */
1019 switch (reloc_data.howto->size)
1022 arc_bfd_put_32 (abfd, insn,
1023 contents + reloc_data.reloc_offset,
1024 reloc_data.input_section);
1027 arc_bfd_put_16 (abfd, insn,
1028 contents + reloc_data.reloc_offset,
1029 reloc_data.input_section);
1032 arc_bfd_put_8 (abfd, insn,
1033 contents + reloc_data.reloc_offset,
1034 reloc_data.input_section);
1037 ARC_DEBUG ("size = %d\n", reloc_data.howto->size);
1042 return bfd_reloc_ok;
1057 #undef ARC_RELOC_HOWTO
1060 /* Relocate an arc ELF section.
1061 Function : elf_arc_relocate_section
1062 Brief : Relocate an arc section, by handling all the relocations
1063 appearing in that section.
1064 Args : output_bfd : The bfd being written to.
1065 info : Link information.
1066 input_bfd : The input bfd.
1067 input_section : The section being relocated.
1068 contents : contents of the section being relocated.
1069 relocs : List of relocations in the section.
1070 local_syms : is a pointer to the swapped in local symbols.
1071 local_section : is an array giving the section in the input file
1072 corresponding to the st_shndx field of each
1075 elf_arc_relocate_section (bfd * output_bfd,
1076 struct bfd_link_info * info,
1078 asection * input_section,
1079 bfd_byte * contents,
1080 Elf_Internal_Rela * relocs,
1081 Elf_Internal_Sym * local_syms,
1082 asection ** local_sections)
1084 Elf_Internal_Shdr * symtab_hdr;
1085 struct elf_link_hash_entry ** sym_hashes;
1086 Elf_Internal_Rela * rel;
1087 Elf_Internal_Rela * wrel;
1088 Elf_Internal_Rela * relend;
1089 struct elf_link_hash_table * htab = elf_hash_table (info);
1091 symtab_hdr = &((elf_tdata (input_bfd))->symtab_hdr);
1092 sym_hashes = elf_sym_hashes (input_bfd);
1094 rel = wrel = relocs;
1095 relend = relocs + input_section->reloc_count;
1096 for (; rel < relend; wrel++, rel++)
1098 enum elf_arc_reloc_type r_type;
1099 reloc_howto_type * howto;
1100 unsigned long r_symndx;
1101 struct elf_link_hash_entry * h;
1102 Elf_Internal_Sym * sym;
1104 struct elf_link_hash_entry * h2;
1107 struct arc_relocation_data reloc_data =
1111 .got_offset_value = 0,
1113 .sym_section = NULL,
1115 .input_section = NULL,
1116 .sdata_begin_symbol_vma = 0,
1117 .sdata_begin_symbol_vma_set = FALSE,
1118 .got_symbol_vma = 0,
1119 .should_relocate = FALSE
1122 r_type = ELF32_R_TYPE (rel->r_info);
1124 if (r_type >= (int) R_ARC_max)
1126 bfd_set_error (bfd_error_bad_value);
1129 howto = arc_elf_howto (r_type);
1131 r_symndx = ELF32_R_SYM (rel->r_info);
1133 /* If we are generating another .o file and the symbol in not
1134 local, skip this relocation. */
1135 if (bfd_link_relocatable (info))
1137 /* This is a relocateable link. We don't have to change
1138 anything, unless the reloc is against a section symbol,
1139 in which case we have to adjust according to where the
1140 section symbol winds up in the output section. */
1142 /* Checks if this is a local symbol and thus the reloc
1143 might (will??) be against a section symbol. */
1144 if (r_symndx < symtab_hdr->sh_info)
1146 sym = local_syms + r_symndx;
1147 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1149 sec = local_sections[r_symndx];
1151 /* For RELA relocs. Just adjust the addend
1152 value in the relocation entry. */
1153 rel->r_addend += sec->output_offset + sym->st_value;
1155 ARC_DEBUG ("local symbols reloc (section=%d %s) seen in %s\n",
1156 (int) r_symndx, local_sections[r_symndx]->name,
1157 __PRETTY_FUNCTION__);
1162 h2 = elf_link_hash_lookup (elf_hash_table (info), "__SDATA_BEGIN__",
1163 FALSE, FALSE, TRUE);
1165 if (reloc_data.sdata_begin_symbol_vma_set == FALSE
1166 && h2 != NULL && h2->root.type != bfd_link_hash_undefined
1167 && h2->root.u.def.section->output_section != NULL)
1168 /* TODO: Verify this condition. */
1170 reloc_data.sdata_begin_symbol_vma =
1171 (h2->root.u.def.value
1172 + h2->root.u.def.section->output_section->vma);
1173 reloc_data.sdata_begin_symbol_vma_set = TRUE;
1176 reloc_data.input_section = input_section;
1177 reloc_data.howto = howto;
1178 reloc_data.reloc_offset = rel->r_offset;
1179 reloc_data.reloc_addend = rel->r_addend;
1181 /* This is a final link. */
1186 if (r_symndx < symtab_hdr->sh_info) /* A local symbol. */
1188 sym = local_syms + r_symndx;
1189 sec = local_sections[r_symndx];
1193 /* TODO: This code is repeated from below. We should
1194 clean it and remove duplications.
1195 Sec is used check for discarded sections.
1196 Need to redesign code below. */
1198 /* Get the symbol's entry in the symtab. */
1199 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1201 while (h->root.type == bfd_link_hash_indirect
1202 || h->root.type == bfd_link_hash_warning)
1203 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1205 /* If we have encountered a definition for this symbol. */
1206 if (h->root.type == bfd_link_hash_defined
1207 || h->root.type == bfd_link_hash_defweak)
1209 reloc_data.sym_value = h->root.u.def.value;
1210 sec = h->root.u.def.section;
1214 /* Clean relocs for symbols in discarded sections. */
1215 if (sec != NULL && discarded_section (sec))
1217 _bfd_clear_contents (howto, input_bfd, input_section,
1218 contents + rel->r_offset);
1219 rel->r_offset = rel->r_offset;
1223 /* For ld -r, remove relocations in debug sections against
1224 sections defined in discarded sections. Not done for
1225 eh_frame editing code expects to be present. */
1226 if (bfd_link_relocatable (info)
1227 && (input_section->flags & SEC_DEBUGGING))
1233 if (bfd_link_relocatable (info))
1240 if (r_symndx < symtab_hdr->sh_info) /* A local symbol. */
1242 reloc_data.sym_value = sym->st_value;
1243 reloc_data.sym_section = sec;
1244 reloc_data.symbol_name =
1245 bfd_elf_string_from_elf_section (input_bfd,
1246 symtab_hdr->sh_link,
1249 /* Mergeable section handling. */
1250 if ((sec->flags & SEC_MERGE)
1251 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1255 rel->r_addend = _bfd_elf_rel_local_sym (output_bfd, sym,
1256 &msec, rel->r_addend);
1257 rel->r_addend -= (sec->output_section->vma
1258 + sec->output_offset
1260 rel->r_addend += msec->output_section->vma + msec->output_offset;
1262 reloc_data.reloc_addend = rel->r_addend;
1265 BFD_ASSERT (htab->sgot != NULL || !is_reloc_for_GOT (howto));
1266 if (htab->sgot != NULL)
1267 reloc_data.got_symbol_vma = htab->sgot->output_section->vma
1268 + htab->sgot->output_offset;
1270 reloc_data.should_relocate = TRUE;
1272 else /* Global symbol. */
1274 /* FIXME: We should use the RELOC_FOR_GLOBAL_SYMBOL macro
1275 (defined in elf-bfd.h) here. */
1277 /* Get the symbol's entry in the symtab. */
1278 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1280 while (h->root.type == bfd_link_hash_indirect
1281 || h->root.type == bfd_link_hash_warning)
1282 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1284 /* TODO: Need to validate what was the intention. */
1285 /* BFD_ASSERT ((h->dynindx == -1) || (h->forced_local != 0)); */
1286 reloc_data.symbol_name = h->root.root.string;
1288 /* If we have encountered a definition for this symbol. */
1289 if (h->root.type == bfd_link_hash_defined
1290 || h->root.type == bfd_link_hash_defweak)
1292 reloc_data.sym_value = h->root.u.def.value;
1293 reloc_data.sym_section = h->root.u.def.section;
1295 reloc_data.should_relocate = TRUE;
1297 if (is_reloc_for_GOT (howto) && !bfd_link_pic (info))
1299 /* TODO: Change it to use arc_do_relocation with
1300 ARC_32 reloc. Try to use ADD_RELA macro. */
1301 bfd_vma relocation =
1302 reloc_data.sym_value + reloc_data.reloc_addend
1303 + (reloc_data.sym_section->output_section != NULL ?
1304 (reloc_data.sym_section->output_offset
1305 + reloc_data.sym_section->output_section->vma)
1308 BFD_ASSERT (h->got.glist);
1309 bfd_vma got_offset = h->got.glist->offset;
1310 bfd_put_32 (output_bfd, relocation,
1311 htab->sgot->contents + got_offset);
1313 if (is_reloc_for_PLT (howto) && h->plt.offset != (bfd_vma) -1)
1315 /* TODO: This is repeated up here. */
1316 reloc_data.sym_value = h->plt.offset;
1317 reloc_data.sym_section = htab->splt;
1320 else if (h->root.type == bfd_link_hash_undefweak)
1322 /* Is weak symbol and has no definition. */
1323 if (is_reloc_for_GOT (howto))
1325 reloc_data.sym_value = h->root.u.def.value;
1326 reloc_data.sym_section = htab->sgot;
1327 reloc_data.should_relocate = TRUE;
1329 else if (is_reloc_for_PLT (howto)
1330 && h->plt.offset != (bfd_vma) -1)
1332 /* TODO: This is repeated up here. */
1333 reloc_data.sym_value = h->plt.offset;
1334 reloc_data.sym_section = htab->splt;
1335 reloc_data.should_relocate = TRUE;
1342 if (is_reloc_for_GOT (howto))
1344 reloc_data.sym_value = h->root.u.def.value;
1345 reloc_data.sym_section = htab->sgot;
1347 reloc_data.should_relocate = TRUE;
1349 else if (is_reloc_for_PLT (howto))
1351 /* Fail if it is linking for PIE and the symbol is
1353 if (bfd_link_executable (info))
1354 (*info->callbacks->undefined_symbol)
1355 (info, h->root.root.string, input_bfd, input_section,
1356 rel->r_offset, TRUE);
1357 reloc_data.sym_value = h->plt.offset;
1358 reloc_data.sym_section = htab->splt;
1360 reloc_data.should_relocate = TRUE;
1362 else if (!bfd_link_pic (info) || bfd_link_executable (info))
1363 (*info->callbacks->undefined_symbol)
1364 (info, h->root.root.string, input_bfd, input_section,
1365 rel->r_offset, TRUE);
1368 BFD_ASSERT (htab->sgot != NULL || !is_reloc_for_GOT (howto));
1369 if (htab->sgot != NULL)
1370 reloc_data.got_symbol_vma = htab->sgot->output_section->vma
1371 + htab->sgot->output_offset;
1374 if ((is_reloc_for_GOT (howto)
1375 || is_reloc_for_TLS (howto)))
1377 reloc_data.should_relocate = TRUE;
1379 struct got_entry **list
1380 = get_got_entry_list_for_symbol (output_bfd, r_symndx, h);
1382 reloc_data.got_offset_value
1383 = relocate_fix_got_relocs_for_got_info (list,
1384 tls_type_for_reloc (howto),
1395 create_got_dynrelocs_for_single_entry (
1396 got_entry_for_type (list,
1397 arc_got_entry_type_for_reloc (howto)),
1398 output_bfd, info, NULL);
1407 case R_ARC_32_PCREL:
1408 if ((bfd_link_pic (info))
1409 && ((r_type != R_ARC_PC32 && r_type != R_ARC_32_PCREL)
1412 && (!info->symbolic || !h->def_regular))))
1414 Elf_Internal_Rela outrel;
1416 bfd_boolean skip = FALSE;
1417 bfd_boolean relocate = FALSE;
1418 asection *sreloc = _bfd_elf_get_dynamic_reloc_section
1419 (input_bfd, input_section,
1422 BFD_ASSERT (sreloc != NULL);
1424 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
1428 if (outrel.r_offset == (bfd_vma) -1)
1431 outrel.r_addend = rel->r_addend;
1432 outrel.r_offset += (input_section->output_section->vma
1433 + input_section->output_offset);
1435 #define IS_ARC_PCREL_TYPE(TYPE) \
1436 ( (TYPE == R_ARC_PC32) \
1437 || (TYPE == R_ARC_32_PCREL))
1441 memset (&outrel, 0, sizeof outrel);
1446 && ((IS_ARC_PCREL_TYPE (r_type))
1447 || !(bfd_link_executable (info)
1448 || SYMBOLIC_BIND (info, h))
1449 || ! h->def_regular))
1451 BFD_ASSERT (h != NULL);
1452 if ((input_section->flags & SEC_ALLOC) != 0)
1457 BFD_ASSERT (h->dynindx != -1);
1458 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1462 /* Handle local symbols, they either do not have a
1463 global hash table entry (h == NULL), or are
1464 forced local due to a version script
1465 (h->forced_local), or the third condition is
1466 legacy, it appears to say something like, for
1467 links where we are pre-binding the symbols, or
1468 there's not an entry for this symbol in the
1469 dynamic symbol table, and it's a regular symbol
1470 not defined in a shared object, then treat the
1471 symbol as local, resolve it now. */
1473 /* outrel.r_addend = 0; */
1474 outrel.r_info = ELF32_R_INFO (0, R_ARC_RELATIVE);
1477 BFD_ASSERT (sreloc->contents != 0);
1479 loc = sreloc->contents;
1480 loc += sreloc->reloc_count * sizeof (Elf32_External_Rela);
1481 sreloc->reloc_count += 1;
1483 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1485 if (relocate == FALSE)
1493 if (is_reloc_SDA_relative (howto)
1494 && (reloc_data.sdata_begin_symbol_vma_set == FALSE))
1497 ("Error: Linker symbol __SDATA_BEGIN__ not found");
1498 bfd_set_error (bfd_error_bad_value);
1502 DEBUG_ARC_RELOC (reloc_data);
1504 /* Make sure we have with a dynamic linker. In case of GOT and PLT
1505 the sym_section should point to .got or .plt respectively. */
1506 if ((is_reloc_for_GOT (howto) || is_reloc_for_PLT (howto))
1507 && reloc_data.sym_section == NULL)
1510 (_("GOT and PLT relocations cannot be fixed with a non dynamic linker."));
1511 bfd_set_error (bfd_error_bad_value);
1516 switch (arc_do_relocation (contents, reloc_data, info))
1519 continue; /* The reloc processing loop. */
1521 case bfd_reloc_overflow:
1522 (*info->callbacks->reloc_overflow)
1523 (info, (h ? &h->root : NULL), reloc_data.symbol_name, howto->name, (bfd_vma) 0,
1524 input_bfd, input_section, rel->r_offset);
1527 case bfd_reloc_undefined:
1528 (*info->callbacks->undefined_symbol)
1529 (info, reloc_data.symbol_name, input_bfd, input_section, rel->r_offset, TRUE);
1532 case bfd_reloc_other:
1533 msg = _("%B(%A): warning: unaligned access to symbol '%s' in the small data area");
1536 case bfd_reloc_outofrange:
1537 msg = _("%B(%A): internal error: out of range error");
1540 case bfd_reloc_notsupported:
1541 msg = _("%B(%A): internal error: unsupported relocation error");
1544 case bfd_reloc_dangerous:
1545 msg = _("%B(%A): internal error: dangerous relocation");
1549 msg = _("%B(%A): internal error: unknown error");
1554 _bfd_error_handler (msg, input_bfd, input_section, reloc_data.symbol_name);
1561 #define elf_arc_hash_table(p) \
1562 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
1563 == ARC_ELF_DATA ? ((struct elf_arc_link_hash_table *) ((p)->hash)) : NULL)
1565 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1566 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1570 arc_elf_create_dynamic_sections (bfd *dynobj,
1571 struct bfd_link_info *info)
1573 struct elf_arc_link_hash_table *htab;
1575 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1578 htab = elf_arc_hash_table (info);
1582 if (bfd_link_executable (info))
1584 /* Always allow copy relocs for building executables. */
1585 asection *s = bfd_get_linker_section (dynobj, ".rela.bss");
1588 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1589 s = bfd_make_section_anyway_with_flags (dynobj,
1591 (bed->dynamic_sec_flags
1594 || ! bfd_set_section_alignment (dynobj, s,
1595 bed->s->log_file_align))
1604 static struct dynamic_sections
1605 arc_create_dynamic_sections (bfd * abfd, struct bfd_link_info *info)
1607 struct elf_link_hash_table *htab;
1609 struct dynamic_sections ds =
1611 .initialized = FALSE,
1621 htab = elf_hash_table (info);
1624 /* Create dynamic sections for relocatable executables so that we
1625 can copy relocations. */
1626 if (! htab->dynamic_sections_created && bfd_link_pic (info))
1628 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
1632 dynobj = (elf_hash_table (info))->dynobj;
1636 ds.sgot = htab->sgot;
1637 ds.srelgot = htab->srelgot;
1639 ds.sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
1640 ds.srelgotplt = ds.srelplt;
1642 ds.splt = bfd_get_section_by_name (dynobj, ".plt");
1643 ds.srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
1646 if (htab->dynamic_sections_created)
1648 ds.sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1651 ds.initialized = TRUE;
1657 elf_arc_check_relocs (bfd * abfd,
1658 struct bfd_link_info * info,
1660 const Elf_Internal_Rela * relocs)
1662 Elf_Internal_Shdr * symtab_hdr;
1663 struct elf_link_hash_entry ** sym_hashes;
1664 const Elf_Internal_Rela * rel;
1665 const Elf_Internal_Rela * rel_end;
1667 asection * sreloc = NULL;
1669 if (bfd_link_relocatable (info))
1672 dynobj = (elf_hash_table (info))->dynobj;
1673 symtab_hdr = &((elf_tdata (abfd))->symtab_hdr);
1674 sym_hashes = elf_sym_hashes (abfd);
1676 rel_end = relocs + sec->reloc_count;
1677 for (rel = relocs; rel < rel_end; rel++)
1679 enum elf_arc_reloc_type r_type;
1680 reloc_howto_type *howto;
1681 unsigned long r_symndx;
1682 struct elf_link_hash_entry *h;
1684 r_type = ELF32_R_TYPE (rel->r_info);
1686 if (r_type >= (int) R_ARC_max)
1688 bfd_set_error (bfd_error_bad_value);
1691 howto = arc_elf_howto (r_type);
1694 && (is_reloc_for_GOT (howto) == TRUE
1695 || is_reloc_for_TLS (howto) == TRUE))
1697 dynobj = elf_hash_table (info)->dynobj = abfd;
1698 if (! _bfd_elf_create_got_section (abfd, info))
1702 /* Load symbol information. */
1703 r_symndx = ELF32_R_SYM (rel->r_info);
1704 if (r_symndx < symtab_hdr->sh_info) /* Is a local symbol. */
1706 else /* Global one. */
1707 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1713 /* During shared library creation, these relocs should not
1714 appear in a shared library (as memory will be read only
1715 and the dynamic linker can not resolve these. However
1716 the error should not occur for e.g. debugging or
1717 non-readonly sections. */
1718 if ((bfd_link_dll (info) && !bfd_link_pie (info))
1719 && (sec->flags & SEC_ALLOC) != 0
1720 && (sec->flags & SEC_READONLY) != 0
1721 && ((sec->flags & SEC_CODE) != 0
1722 || (sec->flags & SEC_DEBUGGING) != 0))
1726 name = h->root.root.string;
1728 /* bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); */
1732 %B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1734 arc_elf_howto (r_type)->name,
1736 bfd_set_error (bfd_error_bad_value);
1740 /* In some cases we are not setting the 'non_got_ref'
1741 flag, even though the relocations don't require a GOT
1742 access. We should extend the testing in this area to
1743 ensure that no significant cases are being missed. */
1748 case R_ARC_32_PCREL:
1749 if ((bfd_link_pic (info))
1750 && ((r_type != R_ARC_PC32 && r_type != R_ARC_32_PCREL)
1752 && (!info->symbolic || !h->def_regular))))
1756 sreloc = _bfd_elf_make_dynamic_reloc_section (sec, dynobj,
1764 sreloc->size += sizeof (Elf32_External_Rela);
1771 if (is_reloc_for_PLT (howto) == TRUE)
1779 /* Add info to the symbol got_entry_list. */
1780 if (is_reloc_for_GOT (howto) == TRUE
1781 || is_reloc_for_TLS (howto) == TRUE)
1783 arc_fill_got_info_for_reloc (
1784 arc_got_entry_type_for_reloc (howto),
1785 get_got_entry_list_for_symbol (abfd, r_symndx, h),
1794 #define ELF_DYNAMIC_INTERPRETER "/sbin/ld-uClibc.so"
1796 static struct plt_version_t *
1797 arc_get_plt_version (struct bfd_link_info *info)
1801 for (i = 0; i < 1; i++)
1803 ARC_DEBUG ("%d: size1 = %d, size2 = %d\n", i,
1804 (int) plt_versions[i].entry_size,
1805 (int) plt_versions[i].elem_size);
1808 if (bfd_get_mach (info->output_bfd) == bfd_mach_arc_arcv2)
1810 if (bfd_link_pic (info))
1811 return &(plt_versions[ELF_ARCV2_PIC]);
1813 return &(plt_versions[ELF_ARCV2_ABS]);
1817 if (bfd_link_pic (info))
1818 return &(plt_versions[ELF_ARC_PIC]);
1820 return &(plt_versions[ELF_ARC_ABS]);
1825 add_symbol_to_plt (struct bfd_link_info *info)
1827 struct elf_link_hash_table *htab = elf_hash_table (info);
1830 struct plt_version_t *plt_data = arc_get_plt_version (info);
1832 /* If this is the first .plt entry, make room for the special first
1834 if (htab->splt->size == 0)
1835 htab->splt->size += plt_data->entry_size;
1837 ret = htab->splt->size;
1839 htab->splt->size += plt_data->elem_size;
1840 ARC_DEBUG ("PLT_SIZE = %d\n", (int) htab->splt->size);
1842 htab->sgotplt->size += 4;
1843 htab->srelplt->size += sizeof (Elf32_External_Rela);
1848 #define PLT_DO_RELOCS_FOR_ENTRY(ABFD, DS, RELOCS) \
1849 plt_do_relocs_for_symbol (ABFD, DS, RELOCS, 0, 0)
1852 plt_do_relocs_for_symbol (bfd *abfd,
1853 struct elf_link_hash_table *htab,
1854 const struct plt_reloc *reloc,
1856 bfd_vma symbol_got_offset)
1858 while (SYM_ONLY (reloc->symbol) != LAST_RELOC)
1860 bfd_vma relocation = 0;
1862 switch (SYM_ONLY (reloc->symbol))
1866 = htab->sgotplt->output_section->vma
1867 + htab->sgotplt->output_offset + symbol_got_offset;
1870 relocation += reloc->addend;
1872 if (IS_RELATIVE (reloc->symbol))
1874 bfd_vma reloc_offset = reloc->offset;
1875 reloc_offset -= (IS_INSN_32 (reloc->symbol)) ? 4 : 0;
1876 reloc_offset -= (IS_INSN_24 (reloc->symbol)) ? 2 : 0;
1878 relocation -= htab->splt->output_section->vma
1879 + htab->splt->output_offset
1880 + plt_offset + reloc_offset;
1883 /* TODO: being ME is not a property of the relocation but of the
1884 section of which is applying the relocation. */
1885 if (IS_MIDDLE_ENDIAN (reloc->symbol) && !bfd_big_endian (abfd))
1888 = ((relocation & 0xffff0000) >> 16)
1889 | ((relocation & 0xffff) << 16);
1892 switch (reloc->size)
1895 bfd_put_32 (htab->splt->output_section->owner,
1897 htab->splt->contents + plt_offset + reloc->offset);
1901 reloc = &(reloc[1]); /* Jump to next relocation. */
1906 relocate_plt_for_symbol (bfd *output_bfd,
1907 struct bfd_link_info *info,
1908 struct elf_link_hash_entry *h)
1910 struct plt_version_t *plt_data = arc_get_plt_version (info);
1911 struct elf_link_hash_table *htab = elf_hash_table (info);
1913 bfd_vma plt_index = (h->plt.offset - plt_data->entry_size)
1914 / plt_data->elem_size;
1915 bfd_vma got_offset = (plt_index + 3) * 4;
1917 ARC_DEBUG ("arc_info: PLT_OFFSET = %#lx, PLT_ENTRY_VMA = %#lx, \
1918 GOT_ENTRY_OFFSET = %#lx, GOT_ENTRY_VMA = %#lx, for symbol %s\n",
1919 (long) h->plt.offset,
1920 (long) (htab->splt->output_section->vma
1921 + htab->splt->output_offset
1924 (long) (htab->sgotplt->output_section->vma
1925 + htab->sgotplt->output_offset
1927 h->root.root.string);
1931 uint16_t *ptr = (uint16_t *) plt_data->elem;
1933 for (i = 0; i < plt_data->elem_size/2; i++)
1935 uint16_t data = ptr[i];
1936 bfd_put_16 (output_bfd,
1938 htab->splt->contents + h->plt.offset + (i*2));
1942 plt_do_relocs_for_symbol (output_bfd, htab,
1943 plt_data->elem_relocs,
1947 /* Fill in the entry in the global offset table. */
1948 bfd_put_32 (output_bfd,
1949 (bfd_vma) (htab->splt->output_section->vma
1950 + htab->splt->output_offset),
1951 htab->sgotplt->contents + got_offset);
1953 /* TODO: Fill in the entry in the .rela.plt section. */
1955 Elf_Internal_Rela rel;
1958 rel.r_offset = (htab->sgotplt->output_section->vma
1959 + htab->sgotplt->output_offset
1963 BFD_ASSERT (h->dynindx != -1);
1964 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARC_JMP_SLOT);
1966 loc = htab->srelplt->contents;
1967 loc += plt_index * sizeof (Elf32_External_Rela); /* relA */
1968 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc);
1973 relocate_plt_for_entry (bfd *abfd,
1974 struct bfd_link_info *info)
1976 struct plt_version_t *plt_data = arc_get_plt_version (info);
1977 struct elf_link_hash_table *htab = elf_hash_table (info);
1981 uint16_t *ptr = (uint16_t *) plt_data->entry;
1982 for (i = 0; i < plt_data->entry_size/2; i++)
1984 uint16_t data = ptr[i];
1987 htab->splt->contents + (i*2));
1990 PLT_DO_RELOCS_FOR_ENTRY (abfd, htab, plt_data->entry_relocs);
1993 /* Desc : Adjust a symbol defined by a dynamic object and referenced
1994 by a regular object. The current definition is in some section of
1995 the dynamic object, but we're not including those sections. We
1996 have to change the definition to something the rest of the link can
2000 elf_arc_adjust_dynamic_symbol (struct bfd_link_info *info,
2001 struct elf_link_hash_entry *h)
2004 bfd *dynobj = (elf_hash_table (info))->dynobj;
2005 struct elf_link_hash_table *htab = elf_hash_table (info);
2007 if (h->type == STT_FUNC
2008 || h->type == STT_GNU_IFUNC
2009 || h->needs_plt == 1)
2011 if (!bfd_link_pic (info) && !h->def_dynamic && !h->ref_dynamic)
2013 /* This case can occur if we saw a PLT32 reloc in an input
2014 file, but the symbol was never referred to by a dynamic
2015 object. In such a case, we don't actually need to build
2016 a procedure linkage table, and we can just do a PC32
2018 BFD_ASSERT (h->needs_plt);
2022 /* Make sure this symbol is output as a dynamic symbol. */
2023 if (h->dynindx == -1 && !h->forced_local
2024 && !bfd_elf_link_record_dynamic_symbol (info, h))
2027 if (bfd_link_pic (info)
2028 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2030 bfd_vma loc = add_symbol_to_plt (info);
2032 if (bfd_link_executable (info) && !h->def_regular)
2034 h->root.u.def.section = htab->splt;
2035 h->root.u.def.value = loc;
2037 h->plt.offset = loc;
2041 h->plt.offset = (bfd_vma) -1;
2047 /* If this is a weak symbol, and there is a real definition, the
2048 processor independent code will have arranged for us to see the
2049 real definition first, and we can just use the same value. */
2050 if (h->u.weakdef != NULL)
2052 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2053 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2054 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2055 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2059 /* This is a reference to a symbol defined by a dynamic object which
2060 is not a function. */
2062 /* If we are creating a shared library, we must presume that the
2063 only references to the symbol are via the global offset table.
2064 For such cases we need not do anything here; the relocations will
2065 be handled correctly by relocate_section. */
2066 if (!bfd_link_executable (info))
2069 /* If there are no non-GOT references, we do not need a copy
2071 if (!h->non_got_ref)
2074 /* If -z nocopyreloc was given, we won't generate them either. */
2075 if (info->nocopyreloc)
2081 /* We must allocate the symbol in our .dynbss section, which will
2082 become part of the .bss section of the executable. There will be
2083 an entry for this symbol in the .dynsym section. The dynamic
2084 object will contain position independent code, so all references
2085 from the dynamic object to this symbol will go through the global
2086 offset table. The dynamic linker will use the .dynsym entry to
2087 determine the address it must put in the global offset table, so
2088 both the dynamic object and the regular object will refer to the
2089 same memory location for the variable. */
2094 /* We must generate a R_ARC_COPY reloc to tell the dynamic linker to
2095 copy the initial value out of the dynamic object and into the
2096 runtime process image. We need to remember the offset into the
2097 .rela.bss section we are going to use. */
2098 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
2100 struct elf_arc_link_hash_table *arc_htab = elf_arc_hash_table (info);
2102 BFD_ASSERT (arc_htab->srelbss != NULL);
2103 arc_htab->srelbss->size += sizeof (Elf32_External_Rela);
2107 /* TODO: Move this also to arc_hash_table. */
2108 s = bfd_get_section_by_name (dynobj, ".dynbss");
2109 BFD_ASSERT (s != NULL);
2111 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2114 /* Function : elf_arc_finish_dynamic_symbol
2115 Brief : Finish up dynamic symbol handling. We set the
2116 contents of various dynamic sections here.
2121 Returns : True/False as the return status. */
2124 elf_arc_finish_dynamic_symbol (bfd * output_bfd,
2125 struct bfd_link_info *info,
2126 struct elf_link_hash_entry *h,
2127 Elf_Internal_Sym * sym)
2129 if (h->plt.offset != (bfd_vma) -1)
2131 relocate_plt_for_symbol (output_bfd, info, h);
2133 if (!h->def_regular)
2135 /* Mark the symbol as undefined, rather than as defined in
2136 the .plt section. Leave the value alone. */
2137 sym->st_shndx = SHN_UNDEF;
2142 /* This function traverses list of GOT entries and
2143 create respective dynamic relocs. */
2144 /* TODO: Make function to get list and not access the list directly. */
2145 /* TODO: Move function to relocate_section create this relocs eagerly. */
2146 create_got_dynrelocs_for_got_info (&h->got.glist,
2153 struct elf_arc_link_hash_table *arc_htab = elf_arc_hash_table (info);
2155 if (h->dynindx == -1
2156 || (h->root.type != bfd_link_hash_defined
2157 && h->root.type != bfd_link_hash_defweak)
2158 || arc_htab->srelbss == NULL)
2161 bfd_vma rel_offset = (h->root.u.def.value
2162 + h->root.u.def.section->output_section->vma
2163 + h->root.u.def.section->output_offset);
2165 bfd_byte * loc = arc_htab->srelbss->contents
2166 + (arc_htab->srelbss->reloc_count * sizeof (Elf32_External_Rela));
2167 arc_htab->srelbss->reloc_count++;
2169 Elf_Internal_Rela rel;
2171 rel.r_offset = rel_offset;
2173 BFD_ASSERT (h->dynindx != -1);
2174 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARC_COPY);
2176 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc);
2179 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2180 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2181 || strcmp (h->root.root.string, "__DYNAMIC") == 0
2182 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2183 sym->st_shndx = SHN_ABS;
2188 #define GET_SYMBOL_OR_SECTION(TAG, SYMBOL, SECTION) \
2190 if (SYMBOL != NULL) \
2191 h = elf_link_hash_lookup (elf_hash_table (info), \
2192 SYMBOL, FALSE, FALSE, TRUE); \
2193 else if (SECTION != NULL) \
2194 s = bfd_get_linker_section (dynobj, SECTION); \
2197 /* Function : elf_arc_finish_dynamic_sections
2198 Brief : Finish up the dynamic sections handling.
2203 Returns : True/False as the return status. */
2206 elf_arc_finish_dynamic_sections (bfd * output_bfd,
2207 struct bfd_link_info *info)
2209 struct dynamic_sections ds = arc_create_dynamic_sections (output_bfd, info);
2210 struct elf_link_hash_table *htab = elf_hash_table (info);
2211 bfd *dynobj = (elf_hash_table (info))->dynobj;
2215 Elf32_External_Dyn *dyncon, *dynconend;
2217 dyncon = (Elf32_External_Dyn *) ds.sdyn->contents;
2219 = (Elf32_External_Dyn *) (ds.sdyn->contents + ds.sdyn->size);
2220 for (; dyncon < dynconend; dyncon++)
2222 Elf_Internal_Dyn internal_dyn;
2223 bfd_boolean do_it = FALSE;
2225 struct elf_link_hash_entry *h = NULL;
2228 bfd_elf32_swap_dyn_in (dynobj, dyncon, &internal_dyn);
2230 switch (internal_dyn.d_tag)
2232 GET_SYMBOL_OR_SECTION (DT_INIT, info->init_function, NULL)
2233 GET_SYMBOL_OR_SECTION (DT_FINI, info->fini_function, NULL)
2234 GET_SYMBOL_OR_SECTION (DT_PLTGOT, NULL, ".plt")
2235 GET_SYMBOL_OR_SECTION (DT_JMPREL, NULL, ".rela.plt")
2236 GET_SYMBOL_OR_SECTION (DT_PLTRELSZ, NULL, ".rela.plt")
2237 GET_SYMBOL_OR_SECTION (DT_RELASZ, NULL, ".rela.plt")
2238 GET_SYMBOL_OR_SECTION (DT_VERSYM, NULL, ".gnu.version")
2239 GET_SYMBOL_OR_SECTION (DT_VERDEF, NULL, ".gnu.version_d")
2240 GET_SYMBOL_OR_SECTION (DT_VERNEED, NULL, ".gnu.version_r")
2245 /* In case the dynamic symbols should be updated with a symbol. */
2247 && (h->root.type == bfd_link_hash_defined
2248 || h->root.type == bfd_link_hash_defweak))
2252 internal_dyn.d_un.d_val = h->root.u.def.value;
2253 asec_ptr = h->root.u.def.section;
2254 if (asec_ptr->output_section != NULL)
2256 internal_dyn.d_un.d_val +=
2257 (asec_ptr->output_section->vma
2258 + asec_ptr->output_offset);
2262 /* The symbol is imported from another shared
2263 library and does not apply to this one. */
2264 internal_dyn.d_un.d_val = 0;
2268 else if (s != NULL) /* With a section information. */
2270 switch (internal_dyn.d_tag)
2277 internal_dyn.d_un.d_ptr = (s->output_section->vma
2278 + s->output_offset);
2283 internal_dyn.d_un.d_val = s->size;
2289 internal_dyn.d_un.d_val -= s->size;
2299 bfd_elf32_swap_dyn_out (output_bfd, &internal_dyn, dyncon);
2302 if (htab->splt->size > 0)
2304 relocate_plt_for_entry (output_bfd, info);
2307 /* TODO: Validate this. */
2308 elf_section_data (htab->srelplt->output_section)->this_hdr.sh_entsize
2312 /* Fill in the first three entries in the global offset table. */
2315 struct elf_link_hash_entry *h;
2316 h = elf_link_hash_lookup (elf_hash_table (info), "_GLOBAL_OFFSET_TABLE_",
2317 FALSE, FALSE, TRUE);
2319 if (h != NULL && h->root.type != bfd_link_hash_undefined
2320 && h->root.u.def.section != NULL)
2322 asection *sec = h->root.u.def.section;
2324 if (ds.sdyn == NULL)
2325 bfd_put_32 (output_bfd, (bfd_vma) 0,
2328 bfd_put_32 (output_bfd,
2329 ds.sdyn->output_section->vma + ds.sdyn->output_offset,
2331 bfd_put_32 (output_bfd, (bfd_vma) 0, sec->contents + 4);
2332 bfd_put_32 (output_bfd, (bfd_vma) 0, sec->contents + 8);
2339 #define ADD_DYNAMIC_SYMBOL(NAME, TAG) \
2340 h = elf_link_hash_lookup (elf_hash_table (info), \
2341 NAME, FALSE, FALSE, FALSE); \
2342 if ((h != NULL && (h->ref_regular || h->def_regular))) \
2343 if (! _bfd_elf_add_dynamic_entry (info, TAG, 0)) \
2346 /* Set the sizes of the dynamic sections. */
2348 elf_arc_size_dynamic_sections (bfd * output_bfd,
2349 struct bfd_link_info *info)
2353 bfd_boolean relocs_exist = FALSE;
2354 bfd_boolean reltext_exist = FALSE;
2355 struct dynamic_sections ds = arc_create_dynamic_sections (output_bfd, info);
2356 struct elf_link_hash_table *htab = elf_hash_table (info);
2358 dynobj = (elf_hash_table (info))->dynobj;
2359 BFD_ASSERT (dynobj != NULL);
2361 if ((elf_hash_table (info))->dynamic_sections_created)
2363 struct elf_link_hash_entry *h;
2365 /* Set the contents of the .interp section to the
2367 if (!bfd_link_pic (info))
2369 s = bfd_get_section_by_name (dynobj, ".interp");
2370 BFD_ASSERT (s != NULL);
2371 s->size = sizeof (ELF_DYNAMIC_INTERPRETER);
2372 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2375 /* Add some entries to the .dynamic section. We fill in some of
2376 the values later, in elf_bfd_final_link, but we must add the
2377 entries now so that we know the final size of the .dynamic
2378 section. Checking if the .init section is present. We also
2379 create DT_INIT and DT_FINI entries if the init_str has been
2380 changed by the user. */
2381 ADD_DYNAMIC_SYMBOL (info->init_function, DT_INIT);
2382 ADD_DYNAMIC_SYMBOL (info->fini_function, DT_FINI);
2386 /* We may have created entries in the .rela.got section.
2387 However, if we are not creating the dynamic sections, we will
2388 not actually use these entries. Reset the size of .rela.got,
2389 which will cause it to get stripped from the output file
2391 if (htab->srelgot != NULL)
2392 htab->srelgot->size = 0;
2395 if (htab->splt != NULL && htab->splt->size == 0)
2396 htab->splt->flags |= SEC_EXCLUDE;
2397 for (s = dynobj->sections; s != NULL; s = s->next)
2399 if ((s->flags & SEC_LINKER_CREATED) == 0)
2402 if (strncmp (s->name, ".rela", 5) == 0)
2406 s->flags |= SEC_EXCLUDE;
2410 if (strcmp (s->name, ".rela.plt") != 0)
2412 const char *outname =
2413 bfd_get_section_name (output_bfd,
2414 htab->srelplt->output_section);
2416 asection *target = bfd_get_section_by_name (output_bfd,
2419 relocs_exist = TRUE;
2420 if (target != NULL && target->size != 0
2421 && (target->flags & SEC_READONLY) != 0
2422 && (target->flags & SEC_ALLOC) != 0)
2423 reltext_exist = TRUE;
2427 /* We use the reloc_count field as a counter if we need to
2428 copy relocs into the output file. */
2432 if (strcmp (s->name, ".dynamic") == 0)
2436 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2438 if (s->contents == NULL && s->size != 0)
2444 /* TODO: Check if this is needed. */
2445 if (!bfd_link_pic (info))
2446 if (!_bfd_elf_add_dynamic_entry (info, DT_DEBUG, 0))
2449 if (htab->splt && (htab->splt->flags & SEC_EXCLUDE) == 0)
2450 if (!_bfd_elf_add_dynamic_entry (info, DT_PLTGOT, 0)
2451 || !_bfd_elf_add_dynamic_entry (info, DT_PLTRELSZ, 0)
2452 || !_bfd_elf_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
2453 || !_bfd_elf_add_dynamic_entry (info, DT_JMPREL, 0)
2457 if (relocs_exist == TRUE)
2458 if (!_bfd_elf_add_dynamic_entry (info, DT_RELA, 0)
2459 || !_bfd_elf_add_dynamic_entry (info, DT_RELASZ, 0)
2460 || !_bfd_elf_add_dynamic_entry (info, DT_RELAENT,
2461 sizeof (Elf32_External_Rela))
2465 if (reltext_exist == TRUE)
2466 if (!_bfd_elf_add_dynamic_entry (info, DT_TEXTREL, 0))
2474 /* Classify dynamic relocs such that -z combreloc can reorder and combine
2476 static enum elf_reloc_type_class
2477 elf32_arc_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
2478 const asection *rel_sec ATTRIBUTE_UNUSED,
2479 const Elf_Internal_Rela *rela)
2481 switch ((int) ELF32_R_TYPE (rela->r_info))
2483 case R_ARC_RELATIVE:
2484 return reloc_class_relative;
2485 case R_ARC_JMP_SLOT:
2486 return reloc_class_plt;
2488 return reloc_class_copy;
2489 /* TODO: Needed in future to support ifunc. */
2491 case R_ARC_IRELATIVE:
2492 return reloc_class_ifunc;
2495 return reloc_class_normal;
2499 const struct elf_size_info arc_elf32_size_info =
2501 sizeof (Elf32_External_Ehdr),
2502 sizeof (Elf32_External_Phdr),
2503 sizeof (Elf32_External_Shdr),
2504 sizeof (Elf32_External_Rel),
2505 sizeof (Elf32_External_Rela),
2506 sizeof (Elf32_External_Sym),
2507 sizeof (Elf32_External_Dyn),
2508 sizeof (Elf_External_Note),
2512 ELFCLASS32, EV_CURRENT,
2513 bfd_elf32_write_out_phdrs,
2514 bfd_elf32_write_shdrs_and_ehdr,
2515 bfd_elf32_checksum_contents,
2516 bfd_elf32_write_relocs,
2517 bfd_elf32_swap_symbol_in,
2518 bfd_elf32_swap_symbol_out,
2519 bfd_elf32_slurp_reloc_table,
2520 bfd_elf32_slurp_symbol_table,
2521 bfd_elf32_swap_dyn_in,
2522 bfd_elf32_swap_dyn_out,
2523 bfd_elf32_swap_reloc_in,
2524 bfd_elf32_swap_reloc_out,
2525 bfd_elf32_swap_reloca_in,
2526 bfd_elf32_swap_reloca_out
2529 #define elf_backend_size_info arc_elf32_size_info
2531 /* Hook called by the linker routine which adds symbols from an object
2535 elf_arc_add_symbol_hook (bfd * abfd,
2536 struct bfd_link_info * info,
2537 Elf_Internal_Sym * sym,
2538 const char ** namep ATTRIBUTE_UNUSED,
2539 flagword * flagsp ATTRIBUTE_UNUSED,
2540 asection ** secp ATTRIBUTE_UNUSED,
2541 bfd_vma * valp ATTRIBUTE_UNUSED)
2543 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
2544 && (abfd->flags & DYNAMIC) == 0
2545 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
2546 elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc;
2551 /* GDB expects general purpose registers to be in section .reg. However Linux
2552 kernel doesn't create this section and instead writes registers to NOTE
2553 section. It is up to the binutils to create a pseudo-section .reg from the
2554 contents of NOTE. Also BFD will read pid and signal number from NOTE. This
2555 function relies on offsets inside elf_prstatus structure in Linux to be
2559 elf32_arc_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
2564 switch (note->descsz)
2569 case 236: /* sizeof (struct elf_prstatus) on Linux/arc. */
2571 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
2573 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
2576 size = (40 * 4); /* There are 40 registers in user_regs_struct. */
2579 /* Make a ".reg/999" section. */
2580 return _bfd_elfcore_make_pseudosection (abfd, ".reg", size,
2581 note->descpos + offset);
2584 #define TARGET_LITTLE_SYM arc_elf32_le_vec
2585 #define TARGET_LITTLE_NAME "elf32-littlearc"
2586 #define TARGET_BIG_SYM arc_elf32_be_vec
2587 #define TARGET_BIG_NAME "elf32-bigarc"
2588 #define ELF_ARCH bfd_arch_arc
2589 #define ELF_TARGET_ID ARC_ELF_DATA
2590 #define ELF_MACHINE_CODE EM_ARC_COMPACT
2591 #define ELF_MACHINE_ALT1 EM_ARC_COMPACT2
2592 #define ELF_MAXPAGESIZE 0x2000
2594 #define bfd_elf32_bfd_link_hash_table_create arc_elf_link_hash_table_create
2596 #define bfd_elf32_bfd_merge_private_bfd_data arc_elf_merge_private_bfd_data
2597 #define bfd_elf32_bfd_reloc_type_lookup arc_elf32_bfd_reloc_type_lookup
2598 #define bfd_elf32_bfd_set_private_flags arc_elf_set_private_flags
2599 #define bfd_elf32_bfd_print_private_bfd_data arc_elf_print_private_bfd_data
2600 #define bfd_elf32_bfd_copy_private_bfd_data arc_elf_copy_private_bfd_data
2602 #define elf_info_to_howto_rel arc_info_to_howto_rel
2603 #define elf_backend_object_p arc_elf_object_p
2604 #define elf_backend_final_write_processing arc_elf_final_write_processing
2606 #define elf_backend_relocate_section elf_arc_relocate_section
2607 #define elf_backend_check_relocs elf_arc_check_relocs
2608 #define elf_backend_create_dynamic_sections arc_elf_create_dynamic_sections
2610 #define elf_backend_reloc_type_class elf32_arc_reloc_type_class
2612 #define elf_backend_adjust_dynamic_symbol elf_arc_adjust_dynamic_symbol
2613 #define elf_backend_finish_dynamic_symbol elf_arc_finish_dynamic_symbol
2615 #define elf_backend_finish_dynamic_sections elf_arc_finish_dynamic_sections
2616 #define elf_backend_size_dynamic_sections elf_arc_size_dynamic_sections
2617 #define elf_backend_add_symbol_hook elf_arc_add_symbol_hook
2619 #define elf_backend_can_gc_sections 1
2620 #define elf_backend_want_got_plt 1
2621 #define elf_backend_plt_readonly 1
2622 #define elf_backend_rela_plts_and_copies_p 1
2623 #define elf_backend_want_plt_sym 0
2624 #define elf_backend_got_header_size 12
2626 #define elf_backend_may_use_rel_p 0
2627 #define elf_backend_may_use_rela_p 1
2628 #define elf_backend_default_use_rela_p 1
2630 #define elf_backend_grok_prstatus elf32_arc_grok_prstatus
2632 #define elf_backend_default_execstack 0
2634 #include "elf32-target.h"