1 /* ARC-specific support for 32-bit ELF
2 Copyright (C) 1994-2017 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 FEATURE_LIST_NAME bfd_feature_list
33 #define CONFLICT_LIST bfd_conflict_list
34 #include "opcode/arc-attrs.h"
36 /* #define ARC_ENABLE_DEBUG 1 */
37 #ifdef ARC_ENABLE_DEBUG
39 name_for_global_symbol (struct elf_link_hash_entry *h)
41 static char *local_str = "(local)";
44 return h->root.root.string;
46 #define ARC_DEBUG(fmt, args...) fprintf (stderr, fmt, ##args)
48 #define ARC_DEBUG(...)
52 #define ADD_RELA(BFD, SECTION, OFFSET, SYM_IDX, TYPE, ADDEND) \
54 struct elf_link_hash_table *_htab = elf_hash_table (info); \
55 Elf_Internal_Rela _rel; \
58 BFD_ASSERT (_htab->srel##SECTION &&_htab->srel##SECTION->contents); \
59 _loc = _htab->srel##SECTION->contents \
60 + ((_htab->srel##SECTION->reloc_count) \
61 * sizeof (Elf32_External_Rela)); \
62 _htab->srel##SECTION->reloc_count++; \
63 _rel.r_addend = ADDEND; \
64 _rel.r_offset = (_htab->s##SECTION)->output_section->vma \
65 + (_htab->s##SECTION)->output_offset + OFFSET; \
66 BFD_ASSERT ((long) SYM_IDX != -1); \
67 _rel.r_info = ELF32_R_INFO (SYM_IDX, TYPE); \
68 bfd_elf32_swap_reloca_out (BFD, &_rel, _loc); \
72 /* The default symbols representing the init and fini dyn values.
73 TODO: Check what is the relation of those strings with arclinux.em
75 #define INIT_SYM_STRING "_init"
76 #define FINI_SYM_STRING "_fini"
78 char * init_str = INIT_SYM_STRING;
79 char * fini_str = FINI_SYM_STRING;
81 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
86 static ATTRIBUTE_UNUSED const char *
87 reloc_type_to_name (unsigned int type)
91 #include "elf/arc-reloc.def"
98 #undef ARC_RELOC_HOWTO
100 /* Try to minimize the amount of space occupied by relocation tables
101 on the ROM (not that the ROM won't be swamped by other ELF overhead). */
105 static ATTRIBUTE_UNUSED bfd_boolean
106 is_reloc_PC_relative (reloc_howto_type *howto)
108 return (strstr (howto->name, "PC") != NULL) ? TRUE : FALSE;
112 is_reloc_SDA_relative (reloc_howto_type *howto)
114 return (strstr (howto->name, "SDA") != NULL) ? TRUE : FALSE;
118 is_reloc_for_GOT (reloc_howto_type * howto)
120 if (strstr (howto->name, "TLS") != NULL)
122 return (strstr (howto->name, "GOT") != NULL) ? TRUE : FALSE;
126 is_reloc_for_PLT (reloc_howto_type * howto)
128 return (strstr (howto->name, "PLT") != NULL) ? TRUE : FALSE;
132 is_reloc_for_TLS (reloc_howto_type *howto)
134 return (strstr (howto->name, "TLS") != NULL) ? TRUE : FALSE;
137 struct arc_relocation_data
139 bfd_signed_vma reloc_offset;
140 bfd_signed_vma reloc_addend;
141 bfd_signed_vma got_offset_value;
143 bfd_signed_vma sym_value;
144 asection * sym_section;
146 reloc_howto_type *howto;
148 asection * input_section;
150 bfd_signed_vma sdata_begin_symbol_vma;
151 bfd_boolean sdata_begin_symbol_vma_set;
152 bfd_signed_vma got_symbol_vma;
154 bfd_boolean should_relocate;
156 const char * symbol_name;
159 /* Should be included at this location due to static declarations
160 * defined before this point. */
163 #define arc_bfd_get_8(A,B,C) bfd_get_8(A,B)
164 #define arc_bfd_get_16(A,B,C) bfd_get_16(A,B)
165 #define arc_bfd_get_32(A,B,C) bfd_get_32(A,B)
166 #define arc_bfd_put_8(A,B,C,D) bfd_put_8(A,B,C)
167 #define arc_bfd_put_16(A,B,C,D) bfd_put_16(A,B,C)
168 #define arc_bfd_put_32(A,B,C,D) bfd_put_32(A,B,C)
171 static bfd_reloc_status_type
172 arc_elf_reloc (bfd *abfd ATTRIBUTE_UNUSED,
173 arelent *reloc_entry,
175 void *data ATTRIBUTE_UNUSED,
176 asection *input_section,
178 char ** error_message ATTRIBUTE_UNUSED)
180 if (output_bfd != NULL)
182 reloc_entry->address += input_section->output_offset;
184 /* In case of relocateable link and if the reloc is against a
185 section symbol, the addend needs to be adjusted according to
186 where the section symbol winds up in the output section. */
187 if ((symbol_in->flags & BSF_SECTION_SYM) && symbol_in->section)
188 reloc_entry->addend += symbol_in->section->output_offset;
193 return bfd_reloc_continue;
197 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
201 #include "elf/arc-reloc.def"
204 #undef ARC_RELOC_HOWTO
206 #define ARC_RELOC_HOWTO(TYPE, VALUE, RSIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
207 [TYPE] = HOWTO (R_##TYPE, 0, RSIZE, BITSIZE, FALSE, 0, \
208 complain_overflow_##OVERFLOW, arc_elf_reloc, \
209 "R_" #TYPE, FALSE, 0, 0, FALSE),
211 static struct reloc_howto_struct elf_arc_howto_table[] =
213 #include "elf/arc-reloc.def"
214 /* Example of what is generated by the preprocessor. Currently kept as an
216 HOWTO (R_ARC_NONE, // Type.
218 2, // Size (0 = byte, 1 = short, 2 = long).
220 FALSE, // PC_relative.
222 complain_overflow_bitfield, // Complain_on_overflow.
223 bfd_elf_generic_reloc, // Special_function.
224 "R_ARC_NONE", // Name.
225 TRUE, // Partial_inplace.
228 FALSE), // PCrel_offset.
231 #undef ARC_RELOC_HOWTO
233 static void arc_elf_howto_init (void)
235 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
236 elf_arc_howto_table[TYPE].pc_relative = \
237 (strstr (#FORMULA, " P ") != NULL || strstr (#FORMULA, " PDATA ") != NULL); \
238 elf_arc_howto_table[TYPE].dst_mask = RELOC_FUNCTION(0, ~0); \
239 /* Only 32 bit data relocations should be marked as ME. */ \
240 if (strstr (#FORMULA, " ME ") != NULL) \
242 BFD_ASSERT (SIZE == 2); \
245 #include "elf/arc-reloc.def"
248 #undef ARC_RELOC_HOWTO
251 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
253 const int howto_table_lookup[] =
255 #include "elf/arc-reloc.def"
257 #undef ARC_RELOC_HOWTO
259 static reloc_howto_type *
260 arc_elf_howto (unsigned int r_type)
262 if (elf_arc_howto_table[R_ARC_32].dst_mask == 0)
263 arc_elf_howto_init ();
264 return &elf_arc_howto_table[r_type];
267 /* Map BFD reloc types to ARC ELF reloc types. */
271 bfd_reloc_code_real_type bfd_reloc_val;
272 unsigned char elf_reloc_val;
275 /* ARC ELF linker hash entry. */
276 struct elf_arc_link_hash_entry
278 struct elf_link_hash_entry root;
280 /* Track dynamic relocs copied for this symbol. */
281 struct elf_dyn_relocs *dyn_relocs;
284 /* ARC ELF linker hash table. */
285 struct elf_arc_link_hash_table
287 struct elf_link_hash_table elf;
290 static struct bfd_hash_entry *
291 elf_arc_link_hash_newfunc (struct bfd_hash_entry *entry,
292 struct bfd_hash_table *table,
295 /* Allocate the structure if it has not already been allocated by a
299 entry = (struct bfd_hash_entry *)
300 bfd_hash_allocate (table,
301 sizeof (struct elf_arc_link_hash_entry));
306 /* Call the allocation method of the superclass. */
307 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
310 struct elf_arc_link_hash_entry *eh;
312 eh = (struct elf_arc_link_hash_entry *) entry;
313 eh->dyn_relocs = NULL;
319 /* Destroy an ARC ELF linker hash table. */
321 elf_arc_link_hash_table_free (bfd *obfd)
323 _bfd_elf_link_hash_table_free (obfd);
326 /* Create an ARC ELF linker hash table. */
328 static struct bfd_link_hash_table *
329 arc_elf_link_hash_table_create (bfd *abfd)
331 struct elf_arc_link_hash_table *ret;
333 ret = (struct elf_arc_link_hash_table *) bfd_zmalloc (sizeof (*ret));
337 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
338 elf_arc_link_hash_newfunc,
339 sizeof (struct elf_arc_link_hash_entry),
346 ret->elf.init_got_refcount.refcount = 0;
347 ret->elf.init_got_refcount.glist = NULL;
348 ret->elf.init_got_offset.offset = 0;
349 ret->elf.init_got_offset.glist = NULL;
351 ret->elf.root.hash_table_free = elf_arc_link_hash_table_free;
353 return &ret->elf.root;
356 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
357 { BFD_RELOC_##TYPE, R_##TYPE },
358 static const struct arc_reloc_map arc_reloc_map[] =
360 #include "elf/arc-reloc.def"
362 {BFD_RELOC_NONE, R_ARC_NONE},
363 {BFD_RELOC_8, R_ARC_8},
364 {BFD_RELOC_16, R_ARC_16},
365 {BFD_RELOC_24, R_ARC_24},
366 {BFD_RELOC_32, R_ARC_32},
368 #undef ARC_RELOC_HOWTO
370 typedef ATTRIBUTE_UNUSED bfd_vma (*replace_func) (unsigned, int ATTRIBUTE_UNUSED);
372 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
374 func = (void *) RELOC_FUNCTION; \
377 get_replace_function (bfd *abfd, unsigned int r_type)
383 #include "elf/arc-reloc.def"
386 if (func == replace_bits24 && bfd_big_endian (abfd))
387 return (replace_func) replace_bits24_be;
389 return (replace_func) func;
391 #undef ARC_RELOC_HOWTO
393 static reloc_howto_type *
394 arc_elf32_bfd_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
395 bfd_reloc_code_real_type code)
399 for (i = ARRAY_SIZE (arc_reloc_map); i--;)
401 if (arc_reloc_map[i].bfd_reloc_val == code)
402 return arc_elf_howto (arc_reloc_map[i].elf_reloc_val);
408 /* Function to set the ELF flag bits. */
410 arc_elf_set_private_flags (bfd *abfd, flagword flags)
412 elf_elfheader (abfd)->e_flags = flags;
413 elf_flags_init (abfd) = TRUE;
417 /* Print private flags. */
419 arc_elf_print_private_bfd_data (bfd *abfd, void * ptr)
421 FILE *file = (FILE *) ptr;
424 BFD_ASSERT (abfd != NULL && ptr != NULL);
426 /* Print normal ELF private data. */
427 _bfd_elf_print_private_bfd_data (abfd, ptr);
429 flags = elf_elfheader (abfd)->e_flags;
430 fprintf (file, _("private flags = 0x%lx:"), (unsigned long) flags);
432 switch (flags & EF_ARC_MACH_MSK)
434 case EF_ARC_CPU_ARCV2HS : fprintf (file, " -mcpu=ARCv2HS"); break;
435 case EF_ARC_CPU_ARCV2EM : fprintf (file, " -mcpu=ARCv2EM"); break;
436 case E_ARC_MACH_ARC600 : fprintf (file, " -mcpu=ARC600"); break;
437 case E_ARC_MACH_ARC601 : fprintf (file, " -mcpu=ARC601"); break;
438 case E_ARC_MACH_ARC700 : fprintf (file, " -mcpu=ARC700"); break;
440 fprintf (file, "-mcpu=unknown");
444 switch (flags & EF_ARC_OSABI_MSK)
446 case E_ARC_OSABI_ORIG : fprintf (file, " (ABI:legacy)"); break;
447 case E_ARC_OSABI_V2 : fprintf (file, " (ABI:v2)"); break;
448 case E_ARC_OSABI_V3 : fprintf (file, " (ABI:v3)"); break;
449 case E_ARC_OSABI_V4 : fprintf (file, " (ABI:v4)"); break;
451 fprintf (file, " (ABI:unknown)");
459 /* Copy backend specific data from one object module to another. */
462 arc_elf_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
464 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
465 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
468 BFD_ASSERT (!elf_flags_init (obfd)
469 || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags);
471 elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
472 elf_flags_init (obfd) = TRUE;
474 /* Copy object attributes. */
475 _bfd_elf_copy_obj_attributes (ibfd, obfd);
477 return _bfd_elf_copy_private_bfd_data (ibfd, obfd);
480 static reloc_howto_type *
481 bfd_elf32_bfd_reloc_name_lookup (bfd * abfd ATTRIBUTE_UNUSED,
486 for (i = 0; i < ARRAY_SIZE (elf_arc_howto_table); i++)
487 if (elf_arc_howto_table[i].name != NULL
488 && strcasecmp (elf_arc_howto_table[i].name, r_name) == 0)
489 return arc_elf_howto (i);
494 /* Set the howto pointer for an ARC ELF reloc. */
497 arc_info_to_howto_rel (bfd * abfd ATTRIBUTE_UNUSED,
499 Elf_Internal_Rela * dst)
503 r_type = ELF32_R_TYPE (dst->r_info);
504 BFD_ASSERT (r_type < (unsigned int) R_ARC_max);
505 cache_ptr->howto = arc_elf_howto (r_type);
508 /* Extract CPU features from an NTBS. */
511 arc_extract_features (const char *p)
518 for (i = 0; i < ARRAY_SIZE (bfd_feature_list); i++)
520 char *t = strstr (p, bfd_feature_list[i].attr);
521 unsigned l = strlen (bfd_feature_list[i].attr);
525 r |= bfd_feature_list[i].feature;
531 /* Concatenate two strings. s1 can be NULL but not
535 arc_stralloc (char * s1, const char * s2)
539 /* Only s1 can be null. */
542 p = s1 ? concat (s1, ",", s2, NULL) : (char *)s2;
547 /* Merge ARC object attributes from IBFD into OBFD. Raise an error if
548 there are conflicting attributes. */
551 arc_elf_merge_attributes (bfd *ibfd, struct bfd_link_info *info)
553 bfd *obfd = info->output_bfd;
554 obj_attribute *in_attr;
555 obj_attribute *out_attr;
557 bfd_boolean result = TRUE;
558 const char *sec_name = get_elf_backend_data (ibfd)->obj_attrs_section;
559 char *tagname = NULL;
561 /* Skip the linker stubs file. This preserves previous behavior
562 of accepting unknown attributes in the first input file - but
564 if (ibfd->flags & BFD_LINKER_CREATED)
567 /* Skip any input that hasn't attribute section.
568 This enables to link object files without attribute section with
570 if (bfd_get_section_by_name (ibfd, sec_name) == NULL)
573 if (!elf_known_obj_attributes_proc (obfd)[0].i)
575 /* This is the first object. Copy the attributes. */
576 _bfd_elf_copy_obj_attributes (ibfd, obfd);
578 out_attr = elf_known_obj_attributes_proc (obfd);
580 /* Use the Tag_null value to indicate the attributes have been
587 in_attr = elf_known_obj_attributes_proc (ibfd);
588 out_attr = elf_known_obj_attributes_proc (obfd);
590 for (i = LEAST_KNOWN_OBJ_ATTRIBUTE; i < NUM_KNOWN_OBJ_ATTRIBUTES; i++)
592 /* Merge this attribute with existing attributes. */
595 case Tag_ARC_PCS_config:
596 if (out_attr[i].i == 0)
597 out_attr[i].i = in_attr[i].i;
598 else if (in_attr[i].i != 0 && out_attr[i].i != in_attr[i].i)
600 const char *tagval[] = { "Absent", "Bare-metal/mwdt",
601 "Bare-metal/newlib", "Linux/uclibc",
603 BFD_ASSERT (in_attr[i].i < 5);
604 BFD_ASSERT (out_attr[i].i < 5);
605 /* It's sometimes ok to mix different configs, so this is only
608 (_("Warning: %B: Conflicting platform configuration "
609 "%s with %s.\n"), ibfd,
610 tagval[in_attr[i].i],
611 tagval[out_attr[i].i]);
615 case Tag_ARC_CPU_base:
616 if (out_attr[i].i == 0)
617 out_attr[i].i = in_attr[i].i;
618 else if (in_attr[i].i != 0 && out_attr[i].i != in_attr[i].i
619 && ((out_attr[i].i + in_attr[i].i) < 6))
621 const char *tagval[] = { "Absent", "ARC6xx", "ARC7xx",
623 BFD_ASSERT (in_attr[i].i < 5);
624 BFD_ASSERT (out_attr[i].i < 5);
625 /* We cannot mix code for different CPUs. */
627 (_("error: %B: unable to merge CPU base attributes "
630 tagval[in_attr[i].i],
631 tagval[out_attr[i].i]);
637 /* The CPUs may be different, check if we can still mix
638 the objects against the output choosen CPU. */
639 unsigned in_feature = 0;
640 unsigned out_feature = 0;
641 char *p1 = in_attr[Tag_ARC_ISA_config].s;
642 char *p2 = out_attr[Tag_ARC_ISA_config].s;
645 unsigned opcode_map[] = {0, ARC_OPCODE_ARC600, ARC_OPCODE_ARC700,
646 ARC_OPCODE_ARCv2EM, ARC_OPCODE_ARCv2HS};
648 BFD_ASSERT (in_attr[i].i < (sizeof (opcode_map)
649 / sizeof (unsigned)));
650 BFD_ASSERT (out_attr[i].i < (sizeof (opcode_map)
651 / sizeof (unsigned)));
652 cpu_out = opcode_map[out_attr[i].i];
654 in_feature = arc_extract_features (p1);
655 out_feature = arc_extract_features (p2);
657 /* First, check if a feature is compatible with the
658 output object chosen CPU. */
659 for (j = 0; j < ARRAY_SIZE (bfd_feature_list); j++)
660 if (((in_feature | out_feature) & bfd_feature_list[j].feature)
661 && (!(cpu_out & bfd_feature_list[j].cpus)))
664 (_("error: %B: unable to merge ISA extension attributes "
666 obfd, bfd_feature_list[j].name);
670 /* Second, if we have compatible features with the
671 chosen CPU, check if they are compatible among
673 for (j = 0; j < ARRAY_SIZE (bfd_conflict_list); j++)
674 if (((in_feature | out_feature) & bfd_conflict_list[j])
675 == bfd_conflict_list[j])
678 for (k = 0; k < ARRAY_SIZE (bfd_feature_list); k++)
680 if (in_feature & bfd_feature_list[k].feature
681 & bfd_conflict_list[j])
682 p1 = (char *) bfd_feature_list[k].name;
683 if (out_feature & bfd_feature_list[k].feature
684 & bfd_conflict_list[j])
685 p2 = (char *) bfd_feature_list[k].name;
688 (_("error: %B: conflicting ISA extension attributes "
694 /* Everithing is alright. */
695 out_feature |= in_feature;
697 for (j = 0; j < ARRAY_SIZE (bfd_feature_list); j++)
698 if (out_feature & bfd_feature_list[j].feature)
699 p1 = arc_stralloc (p1, bfd_feature_list[j].attr);
701 out_attr[Tag_ARC_ISA_config].s =
702 _bfd_elf_attr_strdup (obfd, p1);
705 case Tag_ARC_CPU_variation:
706 case Tag_ARC_ISA_mpy_option:
707 case Tag_ARC_ABI_osver:
708 /* Use the largest value specified. */
709 if (in_attr[i].i > out_attr[i].i)
710 out_attr[i].i = in_attr[i].i;
713 case Tag_ARC_CPU_name:
716 case Tag_ARC_ABI_rf16:
717 if (out_attr[i].i == 0)
718 out_attr[i].i = in_attr[i].i;
719 else if (out_attr[i].i != in_attr[i].i)
721 /* We cannot mix code with rf16 and without. */
723 (_("error: %B: cannot mix rf16 with full register set %B.\n"),
729 case Tag_ARC_ABI_pic:
731 case Tag_ARC_ABI_sda:
734 case Tag_ARC_ABI_tls:
736 const char *tagval[] = { "Absent", "MWDT", "GNU" };
741 BFD_ASSERT (in_attr[i].i < 3);
742 BFD_ASSERT (out_attr[i].i < 3);
743 if (out_attr[i].i != 0 && in_attr[i].i != 0
744 && out_attr[i].i != in_attr[i].i)
747 (_("error: %B: conflicting attributes %s: %s with %s.\n"),
749 tagval[in_attr[i].i],
750 tagval[out_attr[i].i]);
757 case Tag_ARC_ABI_double_size:
758 tagname = "Double size";
759 case Tag_ARC_ABI_enumsize:
761 tagname = "Enum size";
762 case Tag_ARC_ABI_exceptions:
764 tagname = "ABI exceptions";
766 if (out_attr[i].i != 0 && in_attr[i].i != 0
767 && out_attr[i].i != in_attr[i].i)
770 (_("error: %B: conflicting attributes %s.\n"),
776 case Tag_ARC_ISA_apex:
777 break; /* Do nothing for APEX attributes. */
779 case Tag_ARC_ISA_config:
780 /* It is handled in Tag_ARC_CPU_base. */
785 = result && _bfd_elf_merge_unknown_attribute_low (ibfd, obfd, i);
788 /* If out_attr was copied from in_attr then it won't have a type yet. */
789 if (in_attr[i].type && !out_attr[i].type)
790 out_attr[i].type = in_attr[i].type;
793 /* Merge Tag_compatibility attributes and any common GNU ones. */
794 if (!_bfd_elf_merge_object_attributes (ibfd, info))
797 /* Check for any attributes not known on ARC. */
798 result &= _bfd_elf_merge_unknown_attribute_list (ibfd, obfd);
803 /* Merge backend specific data from an object file to the output
804 object file when linking. */
807 arc_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
809 bfd *obfd = info->output_bfd;
810 unsigned short mach_ibfd;
811 static unsigned short mach_obfd = EM_NONE;
816 /* Check if we have the same endianess. */
817 if (! _bfd_generic_verify_endian_match (ibfd, info))
820 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
821 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
824 /* Collect ELF flags. */
825 in_flags = elf_elfheader (ibfd)->e_flags & EF_ARC_MACH_MSK;
826 out_flags = elf_elfheader (obfd)->e_flags & EF_ARC_MACH_MSK;
828 if (!elf_flags_init (obfd)) /* First call, no flags set. */
830 elf_flags_init (obfd) = TRUE;
831 out_flags = in_flags;
834 if (!arc_elf_merge_attributes (ibfd, info))
837 /* Check to see if the input BFD actually contains any sections. Do
838 not short-circuit dynamic objects; their section list may be
839 emptied by elf_link_add_object_symbols. */
840 if (!(ibfd->flags & DYNAMIC))
842 bfd_boolean null_input_bfd = TRUE;
843 bfd_boolean only_data_sections = TRUE;
845 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
847 if ((bfd_get_section_flags (ibfd, sec)
848 & (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
849 == (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
850 only_data_sections = FALSE;
852 null_input_bfd = FALSE;
855 if (null_input_bfd || only_data_sections)
859 /* Complain about various flag/architecture mismatches. */
860 mach_ibfd = elf_elfheader (ibfd)->e_machine;
861 if (mach_obfd == EM_NONE)
863 mach_obfd = mach_ibfd;
867 if (mach_ibfd != mach_obfd)
869 /* xgettext:c-format */
870 _bfd_error_handler (_("ERROR: Attempting to link %B "
871 "with a binary %B of different architecture"),
875 else if ((in_flags != out_flags)
876 /* If we have object attributes, then we already
877 checked the objects compatibility, skip it. */
878 && !bfd_elf_get_obj_attr_int (ibfd, OBJ_ATTR_PROC,
881 /* Warn if different flags. */
883 /* xgettext:c-format */
884 (_("%B: uses different e_flags (0x%lx) fields than "
885 "previous modules (0x%lx)"),
886 ibfd, (long) in_flags, (long) out_flags);
887 if (in_flags && out_flags)
889 /* MWDT doesnt set the eflags hence make sure we choose the
890 eflags set by gcc. */
891 in_flags = in_flags > out_flags ? in_flags : out_flags;
895 /* Everything is correct; don't change the output flags. */
896 in_flags = out_flags;
900 /* Update the flags. */
901 elf_elfheader (obfd)->e_flags = in_flags;
903 if (bfd_get_mach (obfd) < bfd_get_mach (ibfd))
905 return bfd_set_arch_mach (obfd, bfd_arch_arc, bfd_get_mach (ibfd));
911 /* Return a best guess for the machine number based on the attributes. */
914 bfd_arc_get_mach_from_attributes (bfd * abfd)
916 int arch = bfd_elf_get_obj_attr_int (abfd, OBJ_ATTR_PROC, Tag_ARC_CPU_base);
917 unsigned e_machine = elf_elfheader (abfd)->e_machine;
922 return bfd_mach_arc_arc600;
924 return bfd_mach_arc_arc700;
927 return bfd_mach_arc_arcv2;
931 return (e_machine == EM_ARC_COMPACT)
932 ? bfd_mach_arc_arc700 : bfd_mach_arc_arcv2;
935 /* Set the right machine number for an ARC ELF file. */
937 arc_elf_object_p (bfd * abfd)
939 /* Make sure this is initialised, or you'll have the potential of passing
940 garbage---or misleading values---into the call to
941 bfd_default_set_arch_mach (). */
942 unsigned int mach = bfd_mach_arc_arc700;
943 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH_MSK;
944 unsigned e_machine = elf_elfheader (abfd)->e_machine;
946 if (e_machine == EM_ARC_COMPACT || e_machine == EM_ARC_COMPACT2)
950 case E_ARC_MACH_ARC600:
951 mach = bfd_mach_arc_arc600;
953 case E_ARC_MACH_ARC601:
954 mach = bfd_mach_arc_arc601;
956 case E_ARC_MACH_ARC700:
957 mach = bfd_mach_arc_arc700;
959 case EF_ARC_CPU_ARCV2HS:
960 case EF_ARC_CPU_ARCV2EM:
961 mach = bfd_mach_arc_arcv2;
964 mach = bfd_arc_get_mach_from_attributes (abfd);
970 if (e_machine == EM_ARC)
973 (_("Error: The ARC4 architecture is no longer supported.\n"));
979 (_("Warning: unset or old architecture flags. \n"
980 " Use default machine.\n"));
984 return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
987 /* The final processing done just before writing out an ARC ELF object file.
988 This gets the ARC architecture right based on the machine number. */
991 arc_elf_final_write_processing (bfd * abfd,
992 bfd_boolean linker ATTRIBUTE_UNUSED)
995 int osver = bfd_elf_get_obj_attr_int (abfd, OBJ_ATTR_PROC,
997 flagword e_flags = elf_elfheader (abfd)->e_flags & ~EF_ARC_OSABI_MSK;
999 switch (bfd_get_mach (abfd))
1001 case bfd_mach_arc_arc600:
1002 emf = EM_ARC_COMPACT;
1004 case bfd_mach_arc_arc601:
1005 emf = EM_ARC_COMPACT;
1007 case bfd_mach_arc_arc700:
1008 emf = EM_ARC_COMPACT;
1010 case bfd_mach_arc_arcv2:
1011 emf = EM_ARC_COMPACT2;
1017 elf_elfheader (abfd)->e_machine = emf;
1019 /* Record whatever is the current syscall ABI version. */
1021 e_flags |= ((osver & 0x0f) << 8);
1023 e_flags |= E_ARC_OSABI_V3;
1025 elf_elfheader (abfd)->e_flags |= e_flags;
1028 #ifdef ARC_ENABLE_DEBUG
1029 #define DEBUG_ARC_RELOC(A) debug_arc_reloc (A)
1032 debug_arc_reloc (struct arc_relocation_data reloc_data)
1034 ARC_DEBUG ("Reloc type=%s, should_relocate = %s\n",
1035 reloc_data.howto->name,
1036 reloc_data.should_relocate ? "true" : "false");
1037 ARC_DEBUG (" offset = 0x%x, addend = 0x%x\n",
1038 (unsigned int) reloc_data.reloc_offset,
1039 (unsigned int) reloc_data.reloc_addend);
1040 ARC_DEBUG (" Symbol:\n");
1041 ARC_DEBUG (" value = 0x%08x\n",
1042 (unsigned int) reloc_data.sym_value);
1043 if (reloc_data.sym_section != NULL)
1045 ARC_DEBUG (" Symbol Section:\n");
1046 ARC_DEBUG (" section name = %s, output_offset 0x%08x",
1047 reloc_data.sym_section->name,
1048 (unsigned int) reloc_data.sym_section->output_offset);
1049 if (reloc_data.sym_section->output_section != NULL)
1050 ARC_DEBUG (", output_section->vma = 0x%08x",
1051 ((unsigned int) reloc_data.sym_section->output_section->vma));
1053 if (reloc_data.sym_section->owner && reloc_data.sym_section->owner->filename)
1054 ARC_DEBUG (" file: %s\n", reloc_data.sym_section->owner->filename);
1058 ARC_DEBUG (" symbol section is NULL\n");
1061 ARC_DEBUG (" Input_section:\n");
1062 if (reloc_data.input_section != NULL)
1064 ARC_DEBUG (" section name = %s, output_offset 0x%08x, output_section->vma = 0x%08x\n",
1065 reloc_data.input_section->name,
1066 (unsigned int) reloc_data.input_section->output_offset,
1067 (unsigned int) reloc_data.input_section->output_section->vma);
1068 ARC_DEBUG (" changed_address = 0x%08x\n",
1069 (unsigned int) (reloc_data.input_section->output_section->vma
1070 + reloc_data.input_section->output_offset
1071 + reloc_data.reloc_offset));
1072 ARC_DEBUG (" file: %s\n", reloc_data.input_section->owner->filename);
1076 ARC_DEBUG (" input section is NULL\n");
1080 #define DEBUG_ARC_RELOC(A)
1081 #endif /* ARC_ENABLE_DEBUG */
1084 middle_endian_convert (bfd_vma insn, bfd_boolean do_it)
1089 = ((insn & 0xffff0000) >> 16)
1090 | ((insn & 0xffff) << 16);
1095 /* This function is called for relocations that are otherwise marked as NOT
1096 requiring overflow checks. In here we perform non-standard checks of
1097 the relocation value. */
1099 static inline bfd_reloc_status_type
1100 arc_special_overflow_checks (const struct arc_relocation_data reloc_data,
1101 bfd_signed_vma relocation,
1102 struct bfd_link_info *info ATTRIBUTE_UNUSED)
1104 switch (reloc_data.howto->type)
1106 case R_ARC_NPS_CMEM16:
1107 if (((relocation >> 16) & 0xffff) != NPS_CMEM_HIGH_VALUE)
1109 if (reloc_data.reloc_addend == 0)
1111 /* xgettext:c-format */
1112 (_("%B(%A+0x%lx): CMEM relocation to `%s' is invalid, "
1113 "16 MSB should be 0x%04x (value is 0x%lx)"),
1114 reloc_data.input_section->owner,
1115 reloc_data.input_section,
1116 reloc_data.reloc_offset,
1117 reloc_data.symbol_name,
1118 NPS_CMEM_HIGH_VALUE,
1122 /* xgettext:c-format */
1123 (_("%B(%A+0x%lx): CMEM relocation to `%s+0x%lx' is invalid, "
1124 "16 MSB should be 0x%04x (value is 0x%lx)"),
1125 reloc_data.input_section->owner,
1126 reloc_data.input_section,
1127 reloc_data.reloc_offset,
1128 reloc_data.symbol_name,
1129 reloc_data.reloc_addend,
1130 NPS_CMEM_HIGH_VALUE,
1132 return bfd_reloc_overflow;
1140 return bfd_reloc_ok;
1143 #define ME(reloc) (reloc)
1145 #define IS_ME(FORMULA,BFD) ((strstr (FORMULA, "ME") != NULL) \
1146 && (!bfd_big_endian (BFD)))
1148 #define S ((bfd_signed_vma) (reloc_data.sym_value \
1149 + (reloc_data.sym_section->output_section != NULL ? \
1150 (reloc_data.sym_section->output_offset \
1151 + reloc_data.sym_section->output_section->vma) : 0)))
1152 #define L ((bfd_signed_vma) (reloc_data.sym_value \
1153 + (reloc_data.sym_section->output_section != NULL ? \
1154 (reloc_data.sym_section->output_offset \
1155 + reloc_data.sym_section->output_section->vma) : 0)))
1156 #define A (reloc_data.reloc_addend)
1158 #define G (reloc_data.got_offset_value)
1159 #define GOT (reloc_data.got_symbol_vma)
1160 #define GOT_BEGIN (htab->sgot->output_section->vma)
1163 /* P: relative offset to PCL The offset should be to the
1164 current location aligned to 32 bits. */
1165 #define P ((bfd_signed_vma) ( \
1167 (reloc_data.input_section->output_section != NULL ? \
1168 reloc_data.input_section->output_section->vma : 0) \
1169 + reloc_data.input_section->output_offset \
1170 + (reloc_data.reloc_offset - (bitsize >= 32 ? 4 : 0))) \
1172 #define PDATA ((bfd_signed_vma) ( \
1173 (reloc_data.input_section->output_section->vma \
1174 + reloc_data.input_section->output_offset \
1175 + (reloc_data.reloc_offset))))
1176 #define SECTSTART (bfd_signed_vma) (reloc_data.sym_section->output_section->vma \
1177 + reloc_data.sym_section->output_offset)
1179 #define _SDA_BASE_ (bfd_signed_vma) (reloc_data.sdata_begin_symbol_vma)
1180 #define TLS_REL (bfd_signed_vma) \
1181 ((elf_hash_table (info))->tls_sec->output_section->vma)
1182 #define TLS_TBSS (8)
1183 #define TCB_SIZE (8)
1187 #ifdef ARC_ENABLE_DEBUG
1188 #define PRINT_DEBUG_RELOC_INFO_BEFORE(FORMULA, TYPE) \
1191 asection *sym_section = reloc_data.sym_section; \
1192 asection *input_section = reloc_data.input_section; \
1193 ARC_DEBUG ("RELOC_TYPE = " TYPE "\n"); \
1194 ARC_DEBUG ("FORMULA = " FORMULA "\n"); \
1195 ARC_DEBUG ("S = %#lx\n", S); \
1196 ARC_DEBUG ("A = %#lx\n", A); \
1197 ARC_DEBUG ("L = %lx\n", L); \
1198 if (sym_section->output_section != NULL) \
1199 ARC_DEBUG ("symbol_section->vma = %#lx\n", \
1200 sym_section->output_section->vma \
1201 + sym_section->output_offset); \
1203 ARC_DEBUG ("symbol_section->vma = NULL\n"); \
1204 if (input_section->output_section != NULL) \
1205 ARC_DEBUG ("symbol_section->vma = %#lx\n", \
1206 input_section->output_section->vma \
1207 + input_section->output_offset); \
1209 ARC_DEBUG ("symbol_section->vma = NULL\n"); \
1210 ARC_DEBUG ("PCL = %#lx\n", P); \
1211 ARC_DEBUG ("P = %#lx\n", P); \
1212 ARC_DEBUG ("G = %#lx\n", G); \
1213 ARC_DEBUG ("SDA_OFFSET = %#lx\n", _SDA_BASE_); \
1214 ARC_DEBUG ("SDA_SET = %d\n", reloc_data.sdata_begin_symbol_vma_set); \
1215 ARC_DEBUG ("GOT_OFFSET = %#lx\n", GOT); \
1216 ARC_DEBUG ("relocation = %#08lx\n", relocation); \
1217 ARC_DEBUG ("before = %#08x\n", (unsigned) insn); \
1218 ARC_DEBUG ("data = %08x (%u) (%d)\n", (unsigned) relocation, \
1219 (unsigned) relocation, (int) relocation); \
1223 #define PRINT_DEBUG_RELOC_INFO_AFTER \
1226 ARC_DEBUG ("after = 0x%08x\n", (unsigned int) insn); \
1232 #define PRINT_DEBUG_RELOC_INFO_BEFORE(...)
1233 #define PRINT_DEBUG_RELOC_INFO_AFTER
1235 #endif /* ARC_ENABLE_DEBUG */
1237 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
1240 bfd_signed_vma bitsize ATTRIBUTE_UNUSED = BITSIZE; \
1241 relocation = FORMULA ; \
1242 PRINT_DEBUG_RELOC_INFO_BEFORE (#FORMULA, #TYPE); \
1243 insn = middle_endian_convert (insn, IS_ME (#FORMULA, abfd)); \
1244 insn = (* get_replace_function (abfd, TYPE)) (insn, relocation); \
1245 insn = middle_endian_convert (insn, IS_ME (#FORMULA, abfd)); \
1246 PRINT_DEBUG_RELOC_INFO_AFTER; \
1250 static bfd_reloc_status_type
1251 arc_do_relocation (bfd_byte * contents,
1252 struct arc_relocation_data reloc_data,
1253 struct bfd_link_info *info)
1255 bfd_signed_vma relocation = 0;
1257 bfd_vma orig_insn ATTRIBUTE_UNUSED;
1258 bfd * abfd = reloc_data.input_section->owner;
1259 struct elf_link_hash_table *htab ATTRIBUTE_UNUSED = elf_hash_table (info);
1260 bfd_reloc_status_type flag;
1262 if (reloc_data.should_relocate == FALSE)
1263 return bfd_reloc_ok;
1265 switch (reloc_data.howto->size)
1268 insn = arc_bfd_get_32 (abfd,
1269 contents + reloc_data.reloc_offset,
1270 reloc_data.input_section);
1273 insn = arc_bfd_get_16 (abfd,
1274 contents + reloc_data.reloc_offset,
1275 reloc_data.input_section);
1278 insn = arc_bfd_get_8 (abfd,
1279 contents + reloc_data.reloc_offset,
1280 reloc_data.input_section);
1290 switch (reloc_data.howto->type)
1292 #include "elf/arc-reloc.def"
1299 /* Check for relocation overflow. */
1300 if (reloc_data.howto->complain_on_overflow != complain_overflow_dont)
1301 flag = bfd_check_overflow (reloc_data.howto->complain_on_overflow,
1302 reloc_data.howto->bitsize,
1303 reloc_data.howto->rightshift,
1304 bfd_arch_bits_per_address (abfd),
1307 flag = arc_special_overflow_checks (reloc_data, relocation, info);
1309 if (flag != bfd_reloc_ok)
1311 ARC_DEBUG ("Relocation overflows !\n");
1312 DEBUG_ARC_RELOC (reloc_data);
1313 ARC_DEBUG ("Relocation value = signed -> %d, unsigned -> %u"
1314 ", hex -> (0x%08x)\n",
1315 (int) relocation, (unsigned) relocation, (int) relocation);
1320 /* Write updated instruction back to memory. */
1321 switch (reloc_data.howto->size)
1324 arc_bfd_put_32 (abfd, insn,
1325 contents + reloc_data.reloc_offset,
1326 reloc_data.input_section);
1329 arc_bfd_put_16 (abfd, insn,
1330 contents + reloc_data.reloc_offset,
1331 reloc_data.input_section);
1334 arc_bfd_put_8 (abfd, insn,
1335 contents + reloc_data.reloc_offset,
1336 reloc_data.input_section);
1339 ARC_DEBUG ("size = %d\n", reloc_data.howto->size);
1344 return bfd_reloc_ok;
1359 #undef ARC_RELOC_HOWTO
1362 /* Relocate an arc ELF section.
1363 Function : elf_arc_relocate_section
1364 Brief : Relocate an arc section, by handling all the relocations
1365 appearing in that section.
1366 Args : output_bfd : The bfd being written to.
1367 info : Link information.
1368 input_bfd : The input bfd.
1369 input_section : The section being relocated.
1370 contents : contents of the section being relocated.
1371 relocs : List of relocations in the section.
1372 local_syms : is a pointer to the swapped in local symbols.
1373 local_section : is an array giving the section in the input file
1374 corresponding to the st_shndx field of each
1377 elf_arc_relocate_section (bfd * output_bfd,
1378 struct bfd_link_info * info,
1380 asection * input_section,
1381 bfd_byte * contents,
1382 Elf_Internal_Rela * relocs,
1383 Elf_Internal_Sym * local_syms,
1384 asection ** local_sections)
1386 Elf_Internal_Shdr * symtab_hdr;
1387 struct elf_link_hash_entry ** sym_hashes;
1388 Elf_Internal_Rela * rel;
1389 Elf_Internal_Rela * wrel;
1390 Elf_Internal_Rela * relend;
1391 struct elf_link_hash_table * htab = elf_hash_table (info);
1393 symtab_hdr = &((elf_tdata (input_bfd))->symtab_hdr);
1394 sym_hashes = elf_sym_hashes (input_bfd);
1396 rel = wrel = relocs;
1397 relend = relocs + input_section->reloc_count;
1398 for (; rel < relend; wrel++, rel++)
1400 enum elf_arc_reloc_type r_type;
1401 reloc_howto_type * howto;
1402 unsigned long r_symndx;
1403 struct elf_link_hash_entry * h;
1404 Elf_Internal_Sym * sym;
1406 struct elf_link_hash_entry * h2;
1409 struct arc_relocation_data reloc_data =
1413 .got_offset_value = 0,
1415 .sym_section = NULL,
1417 .input_section = NULL,
1418 .sdata_begin_symbol_vma = 0,
1419 .sdata_begin_symbol_vma_set = FALSE,
1420 .got_symbol_vma = 0,
1421 .should_relocate = FALSE
1424 r_type = ELF32_R_TYPE (rel->r_info);
1426 if (r_type >= (int) R_ARC_max)
1428 bfd_set_error (bfd_error_bad_value);
1431 howto = arc_elf_howto (r_type);
1433 r_symndx = ELF32_R_SYM (rel->r_info);
1435 /* If we are generating another .o file and the symbol in not
1436 local, skip this relocation. */
1437 if (bfd_link_relocatable (info))
1439 /* This is a relocateable link. We don't have to change
1440 anything, unless the reloc is against a section symbol,
1441 in which case we have to adjust according to where the
1442 section symbol winds up in the output section. */
1444 /* Checks if this is a local symbol and thus the reloc
1445 might (will??) be against a section symbol. */
1446 if (r_symndx < symtab_hdr->sh_info)
1448 sym = local_syms + r_symndx;
1449 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1451 sec = local_sections[r_symndx];
1453 /* For RELA relocs. Just adjust the addend
1454 value in the relocation entry. */
1455 rel->r_addend += sec->output_offset + sym->st_value;
1457 ARC_DEBUG ("local symbols reloc (section=%d %s) seen in %s\n",
1458 (int) r_symndx, local_sections[r_symndx]->name,
1459 __PRETTY_FUNCTION__);
1464 h2 = elf_link_hash_lookup (elf_hash_table (info), "__SDATA_BEGIN__",
1465 FALSE, FALSE, TRUE);
1467 if (reloc_data.sdata_begin_symbol_vma_set == FALSE
1468 && h2 != NULL && h2->root.type != bfd_link_hash_undefined
1469 && h2->root.u.def.section->output_section != NULL)
1470 /* TODO: Verify this condition. */
1472 reloc_data.sdata_begin_symbol_vma =
1473 (h2->root.u.def.value
1474 + h2->root.u.def.section->output_section->vma);
1475 reloc_data.sdata_begin_symbol_vma_set = TRUE;
1478 reloc_data.input_section = input_section;
1479 reloc_data.howto = howto;
1480 reloc_data.reloc_offset = rel->r_offset;
1481 reloc_data.reloc_addend = rel->r_addend;
1483 /* This is a final link. */
1488 if (r_symndx < symtab_hdr->sh_info) /* A local symbol. */
1490 sym = local_syms + r_symndx;
1491 sec = local_sections[r_symndx];
1495 /* TODO: This code is repeated from below. We should
1496 clean it and remove duplications.
1497 Sec is used check for discarded sections.
1498 Need to redesign code below. */
1500 /* Get the symbol's entry in the symtab. */
1501 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1503 while (h->root.type == bfd_link_hash_indirect
1504 || h->root.type == bfd_link_hash_warning)
1505 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1507 /* If we have encountered a definition for this symbol. */
1508 if (h->root.type == bfd_link_hash_defined
1509 || h->root.type == bfd_link_hash_defweak)
1511 reloc_data.sym_value = h->root.u.def.value;
1512 sec = h->root.u.def.section;
1516 /* Clean relocs for symbols in discarded sections. */
1517 if (sec != NULL && discarded_section (sec))
1519 _bfd_clear_contents (howto, input_bfd, input_section,
1520 contents + rel->r_offset);
1521 rel->r_offset = rel->r_offset;
1525 /* For ld -r, remove relocations in debug sections against
1526 sections defined in discarded sections. Not done for
1527 eh_frame editing code expects to be present. */
1528 if (bfd_link_relocatable (info)
1529 && (input_section->flags & SEC_DEBUGGING))
1535 if (bfd_link_relocatable (info))
1542 if (r_symndx < symtab_hdr->sh_info) /* A local symbol. */
1544 reloc_data.sym_value = sym->st_value;
1545 reloc_data.sym_section = sec;
1546 reloc_data.symbol_name =
1547 bfd_elf_string_from_elf_section (input_bfd,
1548 symtab_hdr->sh_link,
1551 /* Mergeable section handling. */
1552 if ((sec->flags & SEC_MERGE)
1553 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1557 rel->r_addend = _bfd_elf_rel_local_sym (output_bfd, sym,
1558 &msec, rel->r_addend);
1559 rel->r_addend -= (sec->output_section->vma
1560 + sec->output_offset
1562 rel->r_addend += msec->output_section->vma + msec->output_offset;
1564 reloc_data.reloc_addend = rel->r_addend;
1567 BFD_ASSERT (htab->sgot != NULL || !is_reloc_for_GOT (howto));
1568 if (htab->sgot != NULL)
1569 reloc_data.got_symbol_vma = htab->sgot->output_section->vma
1570 + htab->sgot->output_offset;
1572 reloc_data.should_relocate = TRUE;
1574 else /* Global symbol. */
1576 /* FIXME: We should use the RELOC_FOR_GLOBAL_SYMBOL macro
1577 (defined in elf-bfd.h) here. */
1579 /* Get the symbol's entry in the symtab. */
1580 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1582 while (h->root.type == bfd_link_hash_indirect
1583 || h->root.type == bfd_link_hash_warning)
1584 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1586 /* TODO: Need to validate what was the intention. */
1587 /* BFD_ASSERT ((h->dynindx == -1) || (h->forced_local != 0)); */
1588 reloc_data.symbol_name = h->root.root.string;
1590 /* If we have encountered a definition for this symbol. */
1591 if (h->root.type == bfd_link_hash_defined
1592 || h->root.type == bfd_link_hash_defweak)
1594 reloc_data.sym_value = h->root.u.def.value;
1595 reloc_data.sym_section = h->root.u.def.section;
1597 reloc_data.should_relocate = TRUE;
1599 if (is_reloc_for_GOT (howto) && !bfd_link_pic (info))
1601 /* TODO: Change it to use arc_do_relocation with
1602 ARC_32 reloc. Try to use ADD_RELA macro. */
1603 bfd_vma relocation =
1604 reloc_data.sym_value + reloc_data.reloc_addend
1605 + (reloc_data.sym_section->output_section != NULL ?
1606 (reloc_data.sym_section->output_offset
1607 + reloc_data.sym_section->output_section->vma)
1610 BFD_ASSERT (h->got.glist);
1611 bfd_vma got_offset = h->got.glist->offset;
1612 bfd_put_32 (output_bfd, relocation,
1613 htab->sgot->contents + got_offset);
1615 if (is_reloc_for_PLT (howto) && h->plt.offset != (bfd_vma) -1)
1617 /* TODO: This is repeated up here. */
1618 reloc_data.sym_value = h->plt.offset;
1619 reloc_data.sym_section = htab->splt;
1622 else if (h->root.type == bfd_link_hash_undefweak)
1624 /* Is weak symbol and has no definition. */
1625 if (is_reloc_for_GOT (howto))
1627 reloc_data.sym_value = h->root.u.def.value;
1628 reloc_data.sym_section = htab->sgot;
1629 reloc_data.should_relocate = TRUE;
1631 else if (is_reloc_for_PLT (howto)
1632 && h->plt.offset != (bfd_vma) -1)
1634 /* TODO: This is repeated up here. */
1635 reloc_data.sym_value = h->plt.offset;
1636 reloc_data.sym_section = htab->splt;
1637 reloc_data.should_relocate = TRUE;
1644 if (is_reloc_for_GOT (howto))
1646 reloc_data.sym_value = h->root.u.def.value;
1647 reloc_data.sym_section = htab->sgot;
1649 reloc_data.should_relocate = TRUE;
1651 else if (is_reloc_for_PLT (howto))
1653 /* Fail if it is linking for PIE and the symbol is
1655 if (bfd_link_executable (info))
1656 (*info->callbacks->undefined_symbol)
1657 (info, h->root.root.string, input_bfd, input_section,
1658 rel->r_offset, TRUE);
1659 reloc_data.sym_value = h->plt.offset;
1660 reloc_data.sym_section = htab->splt;
1662 reloc_data.should_relocate = TRUE;
1664 else if (!bfd_link_pic (info) || bfd_link_executable (info))
1665 (*info->callbacks->undefined_symbol)
1666 (info, h->root.root.string, input_bfd, input_section,
1667 rel->r_offset, TRUE);
1670 BFD_ASSERT (htab->sgot != NULL || !is_reloc_for_GOT (howto));
1671 if (htab->sgot != NULL)
1672 reloc_data.got_symbol_vma = htab->sgot->output_section->vma
1673 + htab->sgot->output_offset;
1676 if ((is_reloc_for_GOT (howto)
1677 || is_reloc_for_TLS (howto)))
1679 reloc_data.should_relocate = TRUE;
1681 struct got_entry **list
1682 = get_got_entry_list_for_symbol (output_bfd, r_symndx, h);
1684 reloc_data.got_offset_value
1685 = relocate_fix_got_relocs_for_got_info (list,
1686 tls_type_for_reloc (howto),
1697 create_got_dynrelocs_for_single_entry (
1698 got_entry_for_type (list,
1699 arc_got_entry_type_for_reloc (howto)),
1700 output_bfd, info, NULL);
1709 case R_ARC_32_PCREL:
1710 if ((bfd_link_pic (info))
1711 && ((r_type != R_ARC_PC32 && r_type != R_ARC_32_PCREL)
1714 && (!info->symbolic || !h->def_regular))))
1716 Elf_Internal_Rela outrel;
1718 bfd_boolean skip = FALSE;
1719 bfd_boolean relocate = FALSE;
1720 asection *sreloc = _bfd_elf_get_dynamic_reloc_section
1721 (input_bfd, input_section,
1724 BFD_ASSERT (sreloc != NULL);
1726 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
1730 if (outrel.r_offset == (bfd_vma) -1)
1733 outrel.r_addend = rel->r_addend;
1734 outrel.r_offset += (input_section->output_section->vma
1735 + input_section->output_offset);
1737 #define IS_ARC_PCREL_TYPE(TYPE) \
1738 ( (TYPE == R_ARC_PC32) \
1739 || (TYPE == R_ARC_32_PCREL))
1743 memset (&outrel, 0, sizeof outrel);
1748 && ((IS_ARC_PCREL_TYPE (r_type))
1749 || !(bfd_link_executable (info)
1750 || SYMBOLIC_BIND (info, h))
1751 || ! h->def_regular))
1753 BFD_ASSERT (h != NULL);
1754 if ((input_section->flags & SEC_ALLOC) != 0)
1759 BFD_ASSERT (h->dynindx != -1);
1760 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1764 /* Handle local symbols, they either do not have a
1765 global hash table entry (h == NULL), or are
1766 forced local due to a version script
1767 (h->forced_local), or the third condition is
1768 legacy, it appears to say something like, for
1769 links where we are pre-binding the symbols, or
1770 there's not an entry for this symbol in the
1771 dynamic symbol table, and it's a regular symbol
1772 not defined in a shared object, then treat the
1773 symbol as local, resolve it now. */
1775 /* outrel.r_addend = 0; */
1776 outrel.r_info = ELF32_R_INFO (0, R_ARC_RELATIVE);
1779 BFD_ASSERT (sreloc->contents != 0);
1781 loc = sreloc->contents;
1782 loc += sreloc->reloc_count * sizeof (Elf32_External_Rela);
1783 sreloc->reloc_count += 1;
1785 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1787 if (relocate == FALSE)
1795 if (is_reloc_SDA_relative (howto)
1796 && (reloc_data.sdata_begin_symbol_vma_set == FALSE))
1799 ("Error: Linker symbol __SDATA_BEGIN__ not found");
1800 bfd_set_error (bfd_error_bad_value);
1804 DEBUG_ARC_RELOC (reloc_data);
1806 /* Make sure we have with a dynamic linker. In case of GOT and PLT
1807 the sym_section should point to .got or .plt respectively. */
1808 if ((is_reloc_for_GOT (howto) || is_reloc_for_PLT (howto))
1809 && reloc_data.sym_section == NULL)
1812 (_("GOT and PLT relocations cannot be fixed with a non dynamic linker."));
1813 bfd_set_error (bfd_error_bad_value);
1818 switch (arc_do_relocation (contents, reloc_data, info))
1821 continue; /* The reloc processing loop. */
1823 case bfd_reloc_overflow:
1824 (*info->callbacks->reloc_overflow)
1825 (info, (h ? &h->root : NULL), reloc_data.symbol_name, howto->name, (bfd_vma) 0,
1826 input_bfd, input_section, rel->r_offset);
1829 case bfd_reloc_undefined:
1830 (*info->callbacks->undefined_symbol)
1831 (info, reloc_data.symbol_name, input_bfd, input_section, rel->r_offset, TRUE);
1834 case bfd_reloc_other:
1835 /* xgettext:c-format */
1836 msg = _("%B(%A): warning: unaligned access to symbol '%s' in the small data area");
1839 case bfd_reloc_outofrange:
1840 /* xgettext:c-format */
1841 msg = _("%B(%A): internal error: out of range error");
1844 case bfd_reloc_notsupported:
1845 /* xgettext:c-format */
1846 msg = _("%B(%A): internal error: unsupported relocation error");
1849 case bfd_reloc_dangerous:
1850 /* xgettext:c-format */
1851 msg = _("%B(%A): internal error: dangerous relocation");
1855 /* xgettext:c-format */
1856 msg = _("%B(%A): internal error: unknown error");
1861 _bfd_error_handler (msg, input_bfd, input_section, reloc_data.symbol_name);
1868 #define elf_arc_hash_table(p) \
1869 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
1870 == ARC_ELF_DATA ? ((struct elf_arc_link_hash_table *) ((p)->hash)) : NULL)
1873 elf_arc_check_relocs (bfd * abfd,
1874 struct bfd_link_info * info,
1876 const Elf_Internal_Rela * relocs)
1878 Elf_Internal_Shdr * symtab_hdr;
1879 struct elf_link_hash_entry ** sym_hashes;
1880 const Elf_Internal_Rela * rel;
1881 const Elf_Internal_Rela * rel_end;
1883 asection * sreloc = NULL;
1885 if (bfd_link_relocatable (info))
1888 dynobj = (elf_hash_table (info))->dynobj;
1889 symtab_hdr = &((elf_tdata (abfd))->symtab_hdr);
1890 sym_hashes = elf_sym_hashes (abfd);
1892 rel_end = relocs + sec->reloc_count;
1893 for (rel = relocs; rel < rel_end; rel++)
1895 enum elf_arc_reloc_type r_type;
1896 reloc_howto_type *howto;
1897 unsigned long r_symndx;
1898 struct elf_link_hash_entry *h;
1900 r_type = ELF32_R_TYPE (rel->r_info);
1902 if (r_type >= (int) R_ARC_max)
1904 bfd_set_error (bfd_error_bad_value);
1907 howto = arc_elf_howto (r_type);
1910 && (is_reloc_for_GOT (howto) == TRUE
1911 || is_reloc_for_TLS (howto) == TRUE))
1913 dynobj = elf_hash_table (info)->dynobj = abfd;
1914 if (! _bfd_elf_create_got_section (abfd, info))
1918 /* Load symbol information. */
1919 r_symndx = ELF32_R_SYM (rel->r_info);
1920 if (r_symndx < symtab_hdr->sh_info) /* Is a local symbol. */
1922 else /* Global one. */
1923 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1929 /* During shared library creation, these relocs should not
1930 appear in a shared library (as memory will be read only
1931 and the dynamic linker can not resolve these. However
1932 the error should not occur for e.g. debugging or
1933 non-readonly sections. */
1934 if ((bfd_link_dll (info) && !bfd_link_pie (info))
1935 && (sec->flags & SEC_ALLOC) != 0
1936 && (sec->flags & SEC_READONLY) != 0
1937 && ((sec->flags & SEC_CODE) != 0
1938 || (sec->flags & SEC_DEBUGGING) != 0))
1942 name = h->root.root.string;
1944 /* bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); */
1947 /* xgettext:c-format */
1949 %B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1951 arc_elf_howto (r_type)->name,
1953 bfd_set_error (bfd_error_bad_value);
1957 /* In some cases we are not setting the 'non_got_ref'
1958 flag, even though the relocations don't require a GOT
1959 access. We should extend the testing in this area to
1960 ensure that no significant cases are being missed. */
1965 case R_ARC_32_PCREL:
1966 if ((bfd_link_pic (info))
1967 && ((r_type != R_ARC_PC32 && r_type != R_ARC_32_PCREL)
1969 && (!info->symbolic || !h->def_regular))))
1973 sreloc = _bfd_elf_make_dynamic_reloc_section (sec, dynobj,
1981 sreloc->size += sizeof (Elf32_External_Rela);
1988 if (is_reloc_for_PLT (howto) == TRUE)
1996 /* Add info to the symbol got_entry_list. */
1997 if (is_reloc_for_GOT (howto) == TRUE
1998 || is_reloc_for_TLS (howto) == TRUE)
2000 arc_fill_got_info_for_reloc (
2001 arc_got_entry_type_for_reloc (howto),
2002 get_got_entry_list_for_symbol (abfd, r_symndx, h),
2011 #define ELF_DYNAMIC_INTERPRETER "/sbin/ld-uClibc.so"
2013 static struct plt_version_t *
2014 arc_get_plt_version (struct bfd_link_info *info)
2018 for (i = 0; i < 1; i++)
2020 ARC_DEBUG ("%d: size1 = %d, size2 = %d\n", i,
2021 (int) plt_versions[i].entry_size,
2022 (int) plt_versions[i].elem_size);
2025 if (bfd_get_mach (info->output_bfd) == bfd_mach_arc_arcv2)
2027 if (bfd_link_pic (info))
2028 return &(plt_versions[ELF_ARCV2_PIC]);
2030 return &(plt_versions[ELF_ARCV2_ABS]);
2034 if (bfd_link_pic (info))
2035 return &(plt_versions[ELF_ARC_PIC]);
2037 return &(plt_versions[ELF_ARC_ABS]);
2042 add_symbol_to_plt (struct bfd_link_info *info)
2044 struct elf_link_hash_table *htab = elf_hash_table (info);
2047 struct plt_version_t *plt_data = arc_get_plt_version (info);
2049 /* If this is the first .plt entry, make room for the special first
2051 if (htab->splt->size == 0)
2052 htab->splt->size += plt_data->entry_size;
2054 ret = htab->splt->size;
2056 htab->splt->size += plt_data->elem_size;
2057 ARC_DEBUG ("PLT_SIZE = %d\n", (int) htab->splt->size);
2059 htab->sgotplt->size += 4;
2060 htab->srelplt->size += sizeof (Elf32_External_Rela);
2065 #define PLT_DO_RELOCS_FOR_ENTRY(ABFD, DS, RELOCS) \
2066 plt_do_relocs_for_symbol (ABFD, DS, RELOCS, 0, 0)
2069 plt_do_relocs_for_symbol (bfd *abfd,
2070 struct elf_link_hash_table *htab,
2071 const struct plt_reloc *reloc,
2073 bfd_vma symbol_got_offset)
2075 while (SYM_ONLY (reloc->symbol) != LAST_RELOC)
2077 bfd_vma relocation = 0;
2079 switch (SYM_ONLY (reloc->symbol))
2083 = htab->sgotplt->output_section->vma
2084 + htab->sgotplt->output_offset + symbol_got_offset;
2087 relocation += reloc->addend;
2089 if (IS_RELATIVE (reloc->symbol))
2091 bfd_vma reloc_offset = reloc->offset;
2092 reloc_offset -= (IS_INSN_32 (reloc->symbol)) ? 4 : 0;
2093 reloc_offset -= (IS_INSN_24 (reloc->symbol)) ? 2 : 0;
2095 relocation -= htab->splt->output_section->vma
2096 + htab->splt->output_offset
2097 + plt_offset + reloc_offset;
2100 /* TODO: being ME is not a property of the relocation but of the
2101 section of which is applying the relocation. */
2102 if (IS_MIDDLE_ENDIAN (reloc->symbol) && !bfd_big_endian (abfd))
2105 = ((relocation & 0xffff0000) >> 16)
2106 | ((relocation & 0xffff) << 16);
2109 switch (reloc->size)
2112 bfd_put_32 (htab->splt->output_section->owner,
2114 htab->splt->contents + plt_offset + reloc->offset);
2118 reloc = &(reloc[1]); /* Jump to next relocation. */
2123 relocate_plt_for_symbol (bfd *output_bfd,
2124 struct bfd_link_info *info,
2125 struct elf_link_hash_entry *h)
2127 struct plt_version_t *plt_data = arc_get_plt_version (info);
2128 struct elf_link_hash_table *htab = elf_hash_table (info);
2130 bfd_vma plt_index = (h->plt.offset - plt_data->entry_size)
2131 / plt_data->elem_size;
2132 bfd_vma got_offset = (plt_index + 3) * 4;
2134 ARC_DEBUG ("arc_info: PLT_OFFSET = %#lx, PLT_ENTRY_VMA = %#lx, \
2135 GOT_ENTRY_OFFSET = %#lx, GOT_ENTRY_VMA = %#lx, for symbol %s\n",
2136 (long) h->plt.offset,
2137 (long) (htab->splt->output_section->vma
2138 + htab->splt->output_offset
2141 (long) (htab->sgotplt->output_section->vma
2142 + htab->sgotplt->output_offset
2144 h->root.root.string);
2148 uint16_t *ptr = (uint16_t *) plt_data->elem;
2150 for (i = 0; i < plt_data->elem_size/2; i++)
2152 uint16_t data = ptr[i];
2153 bfd_put_16 (output_bfd,
2155 htab->splt->contents + h->plt.offset + (i*2));
2159 plt_do_relocs_for_symbol (output_bfd, htab,
2160 plt_data->elem_relocs,
2164 /* Fill in the entry in the global offset table. */
2165 bfd_put_32 (output_bfd,
2166 (bfd_vma) (htab->splt->output_section->vma
2167 + htab->splt->output_offset),
2168 htab->sgotplt->contents + got_offset);
2170 /* TODO: Fill in the entry in the .rela.plt section. */
2172 Elf_Internal_Rela rel;
2175 rel.r_offset = (htab->sgotplt->output_section->vma
2176 + htab->sgotplt->output_offset
2180 BFD_ASSERT (h->dynindx != -1);
2181 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARC_JMP_SLOT);
2183 loc = htab->srelplt->contents;
2184 loc += plt_index * sizeof (Elf32_External_Rela); /* relA */
2185 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc);
2190 relocate_plt_for_entry (bfd *abfd,
2191 struct bfd_link_info *info)
2193 struct plt_version_t *plt_data = arc_get_plt_version (info);
2194 struct elf_link_hash_table *htab = elf_hash_table (info);
2198 uint16_t *ptr = (uint16_t *) plt_data->entry;
2199 for (i = 0; i < plt_data->entry_size/2; i++)
2201 uint16_t data = ptr[i];
2204 htab->splt->contents + (i*2));
2207 PLT_DO_RELOCS_FOR_ENTRY (abfd, htab, plt_data->entry_relocs);
2210 /* Desc : Adjust a symbol defined by a dynamic object and referenced
2211 by a regular object. The current definition is in some section of
2212 the dynamic object, but we're not including those sections. We
2213 have to change the definition to something the rest of the link can
2217 elf_arc_adjust_dynamic_symbol (struct bfd_link_info *info,
2218 struct elf_link_hash_entry *h)
2221 bfd *dynobj = (elf_hash_table (info))->dynobj;
2222 struct elf_link_hash_table *htab = elf_hash_table (info);
2224 if (h->type == STT_FUNC
2225 || h->type == STT_GNU_IFUNC
2226 || h->needs_plt == 1)
2228 if (!bfd_link_pic (info) && !h->def_dynamic && !h->ref_dynamic)
2230 /* This case can occur if we saw a PLT32 reloc in an input
2231 file, but the symbol was never referred to by a dynamic
2232 object. In such a case, we don't actually need to build
2233 a procedure linkage table, and we can just do a PC32
2235 BFD_ASSERT (h->needs_plt);
2239 /* Make sure this symbol is output as a dynamic symbol. */
2240 if (h->dynindx == -1 && !h->forced_local
2241 && !bfd_elf_link_record_dynamic_symbol (info, h))
2244 if (bfd_link_pic (info)
2245 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2247 bfd_vma loc = add_symbol_to_plt (info);
2249 if (bfd_link_executable (info) && !h->def_regular)
2251 h->root.u.def.section = htab->splt;
2252 h->root.u.def.value = loc;
2254 h->plt.offset = loc;
2258 h->plt.offset = (bfd_vma) -1;
2264 /* If this is a weak symbol, and there is a real definition, the
2265 processor independent code will have arranged for us to see the
2266 real definition first, and we can just use the same value. */
2267 if (h->u.weakdef != NULL)
2269 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2270 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2271 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2272 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2276 /* This is a reference to a symbol defined by a dynamic object which
2277 is not a function. */
2279 /* If we are creating a shared library, we must presume that the
2280 only references to the symbol are via the global offset table.
2281 For such cases we need not do anything here; the relocations will
2282 be handled correctly by relocate_section. */
2283 if (!bfd_link_executable (info))
2286 /* If there are no non-GOT references, we do not need a copy
2288 if (!h->non_got_ref)
2291 /* If -z nocopyreloc was given, we won't generate them either. */
2292 if (info->nocopyreloc)
2298 /* We must allocate the symbol in our .dynbss section, which will
2299 become part of the .bss section of the executable. There will be
2300 an entry for this symbol in the .dynsym section. The dynamic
2301 object will contain position independent code, so all references
2302 from the dynamic object to this symbol will go through the global
2303 offset table. The dynamic linker will use the .dynsym entry to
2304 determine the address it must put in the global offset table, so
2305 both the dynamic object and the regular object will refer to the
2306 same memory location for the variable. */
2311 /* We must generate a R_ARC_COPY reloc to tell the dynamic linker to
2312 copy the initial value out of the dynamic object and into the
2313 runtime process image. We need to remember the offset into the
2314 .rela.bss section we are going to use. */
2315 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
2317 struct elf_arc_link_hash_table *arc_htab = elf_arc_hash_table (info);
2319 BFD_ASSERT (arc_htab->elf.srelbss != NULL);
2320 arc_htab->elf.srelbss->size += sizeof (Elf32_External_Rela);
2324 /* TODO: Move this also to arc_hash_table. */
2325 s = bfd_get_section_by_name (dynobj, ".dynbss");
2326 BFD_ASSERT (s != NULL);
2328 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2331 /* Function : elf_arc_finish_dynamic_symbol
2332 Brief : Finish up dynamic symbol handling. We set the
2333 contents of various dynamic sections here.
2338 Returns : True/False as the return status. */
2341 elf_arc_finish_dynamic_symbol (bfd * output_bfd,
2342 struct bfd_link_info *info,
2343 struct elf_link_hash_entry *h,
2344 Elf_Internal_Sym * sym)
2346 if (h->plt.offset != (bfd_vma) -1)
2348 relocate_plt_for_symbol (output_bfd, info, h);
2350 if (!h->def_regular)
2352 /* Mark the symbol as undefined, rather than as defined in
2353 the .plt section. Leave the value alone. */
2354 sym->st_shndx = SHN_UNDEF;
2359 /* This function traverses list of GOT entries and
2360 create respective dynamic relocs. */
2361 /* TODO: Make function to get list and not access the list directly. */
2362 /* TODO: Move function to relocate_section create this relocs eagerly. */
2363 create_got_dynrelocs_for_got_info (&h->got.glist,
2370 struct elf_arc_link_hash_table *arc_htab = elf_arc_hash_table (info);
2372 if (h->dynindx == -1
2373 || (h->root.type != bfd_link_hash_defined
2374 && h->root.type != bfd_link_hash_defweak)
2375 || arc_htab->elf.srelbss == NULL)
2378 bfd_vma rel_offset = (h->root.u.def.value
2379 + h->root.u.def.section->output_section->vma
2380 + h->root.u.def.section->output_offset);
2382 bfd_byte * loc = arc_htab->elf.srelbss->contents
2383 + (arc_htab->elf.srelbss->reloc_count * sizeof (Elf32_External_Rela));
2384 arc_htab->elf.srelbss->reloc_count++;
2386 Elf_Internal_Rela rel;
2388 rel.r_offset = rel_offset;
2390 BFD_ASSERT (h->dynindx != -1);
2391 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARC_COPY);
2393 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc);
2396 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2397 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2398 || strcmp (h->root.root.string, "__DYNAMIC") == 0
2399 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2400 sym->st_shndx = SHN_ABS;
2405 #define GET_SYMBOL_OR_SECTION(TAG, SYMBOL, SECTION) \
2407 if (SYMBOL != NULL) \
2408 h = elf_link_hash_lookup (elf_hash_table (info), \
2409 SYMBOL, FALSE, FALSE, TRUE); \
2410 else if (SECTION != NULL) \
2411 s = bfd_get_linker_section (dynobj, SECTION); \
2414 /* Function : elf_arc_finish_dynamic_sections
2415 Brief : Finish up the dynamic sections handling.
2420 Returns : True/False as the return status. */
2423 elf_arc_finish_dynamic_sections (bfd * output_bfd,
2424 struct bfd_link_info *info)
2426 struct elf_link_hash_table *htab = elf_hash_table (info);
2427 bfd *dynobj = (elf_hash_table (info))->dynobj;
2428 asection *sdyn = bfd_get_linker_section (dynobj, ".dynamic");
2432 Elf32_External_Dyn *dyncon, *dynconend;
2434 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2436 = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2437 for (; dyncon < dynconend; dyncon++)
2439 Elf_Internal_Dyn internal_dyn;
2440 bfd_boolean do_it = FALSE;
2442 struct elf_link_hash_entry *h = NULL;
2445 bfd_elf32_swap_dyn_in (dynobj, dyncon, &internal_dyn);
2447 switch (internal_dyn.d_tag)
2449 GET_SYMBOL_OR_SECTION (DT_INIT, info->init_function, NULL)
2450 GET_SYMBOL_OR_SECTION (DT_FINI, info->fini_function, NULL)
2451 GET_SYMBOL_OR_SECTION (DT_PLTGOT, NULL, ".plt")
2452 GET_SYMBOL_OR_SECTION (DT_JMPREL, NULL, ".rela.plt")
2453 GET_SYMBOL_OR_SECTION (DT_PLTRELSZ, NULL, ".rela.plt")
2454 GET_SYMBOL_OR_SECTION (DT_VERSYM, NULL, ".gnu.version")
2455 GET_SYMBOL_OR_SECTION (DT_VERDEF, NULL, ".gnu.version_d")
2456 GET_SYMBOL_OR_SECTION (DT_VERNEED, NULL, ".gnu.version_r")
2461 /* In case the dynamic symbols should be updated with a symbol. */
2463 && (h->root.type == bfd_link_hash_defined
2464 || h->root.type == bfd_link_hash_defweak))
2468 internal_dyn.d_un.d_val = h->root.u.def.value;
2469 asec_ptr = h->root.u.def.section;
2470 if (asec_ptr->output_section != NULL)
2472 internal_dyn.d_un.d_val +=
2473 (asec_ptr->output_section->vma
2474 + asec_ptr->output_offset);
2478 /* The symbol is imported from another shared
2479 library and does not apply to this one. */
2480 internal_dyn.d_un.d_val = 0;
2484 else if (s != NULL) /* With a section information. */
2486 switch (internal_dyn.d_tag)
2493 internal_dyn.d_un.d_ptr = (s->output_section->vma
2494 + s->output_offset);
2499 internal_dyn.d_un.d_val = s->size;
2509 bfd_elf32_swap_dyn_out (output_bfd, &internal_dyn, dyncon);
2512 if (htab->splt->size > 0)
2514 relocate_plt_for_entry (output_bfd, info);
2517 /* TODO: Validate this. */
2518 if (htab->srelplt->output_section != bfd_abs_section_ptr)
2519 elf_section_data (htab->srelplt->output_section)
2520 ->this_hdr.sh_entsize = 12;
2523 /* Fill in the first three entries in the global offset table. */
2526 struct elf_link_hash_entry *h;
2527 h = elf_link_hash_lookup (elf_hash_table (info), "_GLOBAL_OFFSET_TABLE_",
2528 FALSE, FALSE, TRUE);
2530 if (h != NULL && h->root.type != bfd_link_hash_undefined
2531 && h->root.u.def.section != NULL)
2533 asection *sec = h->root.u.def.section;
2536 bfd_put_32 (output_bfd, (bfd_vma) 0,
2539 bfd_put_32 (output_bfd,
2540 sdyn->output_section->vma + sdyn->output_offset,
2542 bfd_put_32 (output_bfd, (bfd_vma) 0, sec->contents + 4);
2543 bfd_put_32 (output_bfd, (bfd_vma) 0, sec->contents + 8);
2550 #define ADD_DYNAMIC_SYMBOL(NAME, TAG) \
2551 h = elf_link_hash_lookup (elf_hash_table (info), \
2552 NAME, FALSE, FALSE, FALSE); \
2553 if ((h != NULL && (h->ref_regular || h->def_regular))) \
2554 if (! _bfd_elf_add_dynamic_entry (info, TAG, 0)) \
2557 /* Set the sizes of the dynamic sections. */
2559 elf_arc_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2560 struct bfd_link_info *info)
2564 bfd_boolean relocs_exist = FALSE;
2565 bfd_boolean reltext_exist = FALSE;
2566 struct elf_link_hash_table *htab = elf_hash_table (info);
2568 dynobj = htab->dynobj;
2569 BFD_ASSERT (dynobj != NULL);
2571 if (htab->dynamic_sections_created)
2573 struct elf_link_hash_entry *h;
2575 /* Set the contents of the .interp section to the
2577 if (bfd_link_executable (info) && !info->nointerp)
2579 s = bfd_get_section_by_name (dynobj, ".interp");
2580 BFD_ASSERT (s != NULL);
2581 s->size = sizeof (ELF_DYNAMIC_INTERPRETER);
2582 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2585 /* Add some entries to the .dynamic section. We fill in some of
2586 the values later, in elf_bfd_final_link, but we must add the
2587 entries now so that we know the final size of the .dynamic
2588 section. Checking if the .init section is present. We also
2589 create DT_INIT and DT_FINI entries if the init_str has been
2590 changed by the user. */
2591 ADD_DYNAMIC_SYMBOL (info->init_function, DT_INIT);
2592 ADD_DYNAMIC_SYMBOL (info->fini_function, DT_FINI);
2596 /* We may have created entries in the .rela.got section.
2597 However, if we are not creating the dynamic sections, we will
2598 not actually use these entries. Reset the size of .rela.got,
2599 which will cause it to get stripped from the output file
2601 if (htab->srelgot != NULL)
2602 htab->srelgot->size = 0;
2605 for (s = dynobj->sections; s != NULL; s = s->next)
2607 if ((s->flags & SEC_LINKER_CREATED) == 0)
2612 || s == htab->sgotplt
2613 || s == htab->sdynbss)
2615 /* Strip this section if we don't need it. */
2617 else if (strncmp (s->name, ".rela", 5) == 0)
2619 if (s->size != 0 && s != htab->srelplt)
2623 const char *name = s->name + 5;
2625 for (ibfd = info->input_bfds; ibfd; ibfd = ibfd->link.next)
2626 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour)
2628 asection *target = bfd_get_section_by_name (ibfd, name);
2630 && elf_section_data (target)->sreloc == s
2631 && ((target->output_section->flags
2632 & (SEC_READONLY | SEC_ALLOC))
2633 == (SEC_READONLY | SEC_ALLOC)))
2635 reltext_exist = TRUE;
2640 relocs_exist = TRUE;
2643 /* We use the reloc_count field as a counter if we need to
2644 copy relocs into the output file. */
2649 /* It's not one of our sections, so don't allocate space. */
2655 s->flags |= SEC_EXCLUDE;
2659 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2662 /* Allocate memory for the section contents. */
2663 s->contents = bfd_zalloc (dynobj, s->size);
2664 if (s->contents == NULL)
2668 if (htab->dynamic_sections_created)
2670 /* TODO: Check if this is needed. */
2671 if (!bfd_link_pic (info))
2672 if (!_bfd_elf_add_dynamic_entry (info, DT_DEBUG, 0))
2675 if (htab->splt && (htab->splt->flags & SEC_EXCLUDE) == 0)
2676 if (!_bfd_elf_add_dynamic_entry (info, DT_PLTGOT, 0)
2677 || !_bfd_elf_add_dynamic_entry (info, DT_PLTRELSZ, 0)
2678 || !_bfd_elf_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
2679 || !_bfd_elf_add_dynamic_entry (info, DT_JMPREL, 0))
2683 if (!_bfd_elf_add_dynamic_entry (info, DT_RELA, 0)
2684 || !_bfd_elf_add_dynamic_entry (info, DT_RELASZ, 0)
2685 || !_bfd_elf_add_dynamic_entry (info, DT_RELAENT,
2686 sizeof (Elf32_External_Rela)))
2690 if (!_bfd_elf_add_dynamic_entry (info, DT_TEXTREL, 0))
2698 /* Classify dynamic relocs such that -z combreloc can reorder and combine
2700 static enum elf_reloc_type_class
2701 elf32_arc_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
2702 const asection *rel_sec ATTRIBUTE_UNUSED,
2703 const Elf_Internal_Rela *rela)
2705 switch ((int) ELF32_R_TYPE (rela->r_info))
2707 case R_ARC_RELATIVE:
2708 return reloc_class_relative;
2709 case R_ARC_JMP_SLOT:
2710 return reloc_class_plt;
2712 return reloc_class_copy;
2713 /* TODO: Needed in future to support ifunc. */
2715 case R_ARC_IRELATIVE:
2716 return reloc_class_ifunc;
2719 return reloc_class_normal;
2723 const struct elf_size_info arc_elf32_size_info =
2725 sizeof (Elf32_External_Ehdr),
2726 sizeof (Elf32_External_Phdr),
2727 sizeof (Elf32_External_Shdr),
2728 sizeof (Elf32_External_Rel),
2729 sizeof (Elf32_External_Rela),
2730 sizeof (Elf32_External_Sym),
2731 sizeof (Elf32_External_Dyn),
2732 sizeof (Elf_External_Note),
2736 ELFCLASS32, EV_CURRENT,
2737 bfd_elf32_write_out_phdrs,
2738 bfd_elf32_write_shdrs_and_ehdr,
2739 bfd_elf32_checksum_contents,
2740 bfd_elf32_write_relocs,
2741 bfd_elf32_swap_symbol_in,
2742 bfd_elf32_swap_symbol_out,
2743 bfd_elf32_slurp_reloc_table,
2744 bfd_elf32_slurp_symbol_table,
2745 bfd_elf32_swap_dyn_in,
2746 bfd_elf32_swap_dyn_out,
2747 bfd_elf32_swap_reloc_in,
2748 bfd_elf32_swap_reloc_out,
2749 bfd_elf32_swap_reloca_in,
2750 bfd_elf32_swap_reloca_out
2753 #define elf_backend_size_info arc_elf32_size_info
2755 /* Hook called by the linker routine which adds symbols from an object
2759 elf_arc_add_symbol_hook (bfd * abfd,
2760 struct bfd_link_info * info,
2761 Elf_Internal_Sym * sym,
2762 const char ** namep ATTRIBUTE_UNUSED,
2763 flagword * flagsp ATTRIBUTE_UNUSED,
2764 asection ** secp ATTRIBUTE_UNUSED,
2765 bfd_vma * valp ATTRIBUTE_UNUSED)
2767 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
2768 && (abfd->flags & DYNAMIC) == 0
2769 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
2770 elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc;
2775 /* GDB expects general purpose registers to be in section .reg. However Linux
2776 kernel doesn't create this section and instead writes registers to NOTE
2777 section. It is up to the binutils to create a pseudo-section .reg from the
2778 contents of NOTE. Also BFD will read pid and signal number from NOTE. This
2779 function relies on offsets inside elf_prstatus structure in Linux to be
2783 elf32_arc_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
2788 switch (note->descsz)
2793 case 236: /* sizeof (struct elf_prstatus) on Linux/arc. */
2795 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
2797 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
2800 size = (40 * 4); /* There are 40 registers in user_regs_struct. */
2803 /* Make a ".reg/999" section. */
2804 return _bfd_elfcore_make_pseudosection (abfd, ".reg", size,
2805 note->descpos + offset);
2808 /* Determine whether an object attribute tag takes an integer, a
2812 elf32_arc_obj_attrs_arg_type (int tag)
2814 if (tag == Tag_ARC_CPU_name
2815 || tag == Tag_ARC_ISA_config
2816 || tag == Tag_ARC_ISA_apex)
2817 return ATTR_TYPE_FLAG_STR_VAL;
2818 else if (tag < (Tag_ARC_ISA_mpy_option + 1))
2819 return ATTR_TYPE_FLAG_INT_VAL;
2821 return (tag & 1) != 0 ? ATTR_TYPE_FLAG_STR_VAL : ATTR_TYPE_FLAG_INT_VAL;
2824 /* Attribute numbers >=14 can be safely ignored. */
2827 elf32_arc_obj_attrs_handle_unknown (bfd *abfd, int tag)
2829 if ((tag & 127) < (Tag_ARC_ISA_mpy_option + 1))
2832 (_("%B: Unknown mandatory ARC object attribute %d."),
2834 bfd_set_error (bfd_error_bad_value);
2840 (_("Warning: %B: Unknown ARC object attribute %d."),
2846 /* Handle an ARC specific section when reading an object file. This is
2847 called when bfd_section_from_shdr finds a section with an unknown
2851 elf32_arc_section_from_shdr (bfd *abfd,
2852 Elf_Internal_Shdr * hdr,
2856 switch (hdr->sh_type)
2858 case SHT_ARC_ATTRIBUTES:
2865 if (!_bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
2871 #define TARGET_LITTLE_SYM arc_elf32_le_vec
2872 #define TARGET_LITTLE_NAME "elf32-littlearc"
2873 #define TARGET_BIG_SYM arc_elf32_be_vec
2874 #define TARGET_BIG_NAME "elf32-bigarc"
2875 #define ELF_ARCH bfd_arch_arc
2876 #define ELF_TARGET_ID ARC_ELF_DATA
2877 #define ELF_MACHINE_CODE EM_ARC_COMPACT
2878 #define ELF_MACHINE_ALT1 EM_ARC_COMPACT2
2879 #define ELF_MAXPAGESIZE 0x2000
2881 #define bfd_elf32_bfd_link_hash_table_create arc_elf_link_hash_table_create
2883 #define bfd_elf32_bfd_merge_private_bfd_data arc_elf_merge_private_bfd_data
2884 #define bfd_elf32_bfd_reloc_type_lookup arc_elf32_bfd_reloc_type_lookup
2885 #define bfd_elf32_bfd_set_private_flags arc_elf_set_private_flags
2886 #define bfd_elf32_bfd_print_private_bfd_data arc_elf_print_private_bfd_data
2887 #define bfd_elf32_bfd_copy_private_bfd_data arc_elf_copy_private_bfd_data
2889 #define elf_info_to_howto_rel arc_info_to_howto_rel
2890 #define elf_backend_object_p arc_elf_object_p
2891 #define elf_backend_final_write_processing arc_elf_final_write_processing
2893 #define elf_backend_relocate_section elf_arc_relocate_section
2894 #define elf_backend_check_relocs elf_arc_check_relocs
2895 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
2897 #define elf_backend_reloc_type_class elf32_arc_reloc_type_class
2899 #define elf_backend_adjust_dynamic_symbol elf_arc_adjust_dynamic_symbol
2900 #define elf_backend_finish_dynamic_symbol elf_arc_finish_dynamic_symbol
2902 #define elf_backend_finish_dynamic_sections elf_arc_finish_dynamic_sections
2903 #define elf_backend_size_dynamic_sections elf_arc_size_dynamic_sections
2904 #define elf_backend_add_symbol_hook elf_arc_add_symbol_hook
2906 #define elf_backend_can_gc_sections 1
2907 #define elf_backend_want_got_plt 1
2908 #define elf_backend_plt_readonly 1
2909 #define elf_backend_rela_plts_and_copies_p 1
2910 #define elf_backend_want_plt_sym 0
2911 #define elf_backend_got_header_size 12
2912 #define elf_backend_dtrel_excludes_plt 1
2914 #define elf_backend_may_use_rel_p 0
2915 #define elf_backend_may_use_rela_p 1
2916 #define elf_backend_default_use_rela_p 1
2918 #define elf_backend_grok_prstatus elf32_arc_grok_prstatus
2920 #define elf_backend_default_execstack 0
2922 #undef elf_backend_obj_attrs_vendor
2923 #define elf_backend_obj_attrs_vendor "ARC"
2924 #undef elf_backend_obj_attrs_section
2925 #define elf_backend_obj_attrs_section ".ARC.attributes"
2926 #undef elf_backend_obj_attrs_arg_type
2927 #define elf_backend_obj_attrs_arg_type elf32_arc_obj_attrs_arg_type
2928 #undef elf_backend_obj_attrs_section_type
2929 #define elf_backend_obj_attrs_section_type SHT_ARC_ATTRIBUTES
2930 #define elf_backend_obj_attrs_handle_unknown elf32_arc_obj_attrs_handle_unknown
2932 #define elf_backend_section_from_shdr elf32_arc_section_from_shdr
2934 #include "elf32-target.h"