1 /* ARC-specific support for 32-bit ELF
2 Copyright (C) 1994-2019 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 if (_htab->dynamic_sections_created == TRUE) \
60 BFD_ASSERT (_htab->srel##SECTION &&_htab->srel##SECTION->contents); \
61 _loc = _htab->srel##SECTION->contents \
62 + ((_htab->srel##SECTION->reloc_count) \
63 * sizeof (Elf32_External_Rela)); \
64 _htab->srel##SECTION->reloc_count++; \
65 _rel.r_addend = ADDEND; \
66 _rel.r_offset = (_htab->s##SECTION)->output_section->vma \
67 + (_htab->s##SECTION)->output_offset + OFFSET; \
68 BFD_ASSERT ((long) SYM_IDX != -1); \
69 _rel.r_info = ELF32_R_INFO (SYM_IDX, TYPE); \
70 bfd_elf32_swap_reloca_out (BFD, &_rel, _loc); \
74 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
79 static ATTRIBUTE_UNUSED const char *
80 reloc_type_to_name (unsigned int type)
84 #include "elf/arc-reloc.def"
92 #undef ARC_RELOC_HOWTO
94 /* Try to minimize the amount of space occupied by relocation tables
95 on the ROM (not that the ROM won't be swamped by other ELF overhead). */
99 static ATTRIBUTE_UNUSED bfd_boolean
100 is_reloc_PC_relative (reloc_howto_type *howto)
102 return (strstr (howto->name, "PC") != NULL) ? TRUE : FALSE;
106 is_reloc_SDA_relative (reloc_howto_type *howto)
108 return (strstr (howto->name, "SDA") != NULL) ? TRUE : FALSE;
112 is_reloc_for_GOT (reloc_howto_type * howto)
114 if (strstr (howto->name, "TLS") != NULL)
116 return (strstr (howto->name, "GOT") != NULL) ? TRUE : FALSE;
120 is_reloc_for_PLT (reloc_howto_type * howto)
122 return (strstr (howto->name, "PLT") != NULL) ? TRUE : FALSE;
126 is_reloc_for_TLS (reloc_howto_type *howto)
128 return (strstr (howto->name, "TLS") != NULL) ? TRUE : FALSE;
131 struct arc_relocation_data
133 bfd_signed_vma reloc_offset;
134 bfd_signed_vma reloc_addend;
135 bfd_signed_vma got_offset_value;
137 bfd_signed_vma sym_value;
138 asection * sym_section;
140 reloc_howto_type *howto;
142 asection * input_section;
144 bfd_signed_vma sdata_begin_symbol_vma;
145 bfd_boolean sdata_begin_symbol_vma_set;
146 bfd_signed_vma got_symbol_vma;
148 bfd_boolean should_relocate;
150 const char * symbol_name;
153 /* ARC ELF linker hash entry. */
154 struct elf_arc_link_hash_entry
156 struct elf_link_hash_entry root;
158 /* Track dynamic relocs copied for this symbol. */
159 struct elf_dyn_relocs *dyn_relocs;
161 struct got_entry *got_ents;
165 /* Should be included at this location due to static declarations
166 defined before this point. */
169 #define arc_bfd_get_8(A,B,C) bfd_get_8(A,B)
170 #define arc_bfd_get_16(A,B,C) bfd_get_16(A,B)
171 #define arc_bfd_get_32(A,B,C) bfd_get_32(A,B)
172 #define arc_bfd_put_8(A,B,C,D) bfd_put_8(A,B,C)
173 #define arc_bfd_put_16(A,B,C,D) bfd_put_16(A,B,C)
174 #define arc_bfd_put_32(A,B,C,D) bfd_put_32(A,B,C)
177 static bfd_reloc_status_type
178 arc_elf_reloc (bfd *abfd ATTRIBUTE_UNUSED,
179 arelent *reloc_entry,
181 void *data ATTRIBUTE_UNUSED,
182 asection *input_section,
184 char ** error_message ATTRIBUTE_UNUSED)
186 if (output_bfd != NULL)
188 reloc_entry->address += input_section->output_offset;
190 /* In case of relocateable link and if the reloc is against a
191 section symbol, the addend needs to be adjusted according to
192 where the section symbol winds up in the output section. */
193 if ((symbol_in->flags & BSF_SECTION_SYM) && symbol_in->section)
194 reloc_entry->addend += symbol_in->section->output_offset;
199 return bfd_reloc_continue;
203 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
208 #include "elf/arc-reloc.def"
212 #undef ARC_RELOC_HOWTO
214 #define ARC_RELOC_HOWTO(TYPE, VALUE, RSIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
215 [TYPE] = HOWTO (R_##TYPE, 0, RSIZE, BITSIZE, FALSE, 0, \
216 complain_overflow_##OVERFLOW, arc_elf_reloc, \
217 "R_" #TYPE, FALSE, 0, 0, FALSE),
219 static struct reloc_howto_struct elf_arc_howto_table[] =
221 #include "elf/arc-reloc.def"
222 /* Example of what is generated by the preprocessor. Currently kept as an
224 HOWTO (R_ARC_NONE, // Type.
226 2, // Size (0 = byte, 1 = short, 2 = long).
228 FALSE, // PC_relative.
230 complain_overflow_bitfield, // Complain_on_overflow.
231 bfd_elf_generic_reloc, // Special_function.
232 "R_ARC_NONE", // Name.
233 TRUE, // Partial_inplace.
236 FALSE), // PCrel_offset.
239 #undef ARC_RELOC_HOWTO
242 arc_elf_howto_init (void)
244 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
245 elf_arc_howto_table[TYPE].pc_relative = \
246 (strstr (#FORMULA, " P ") != NULL || strstr (#FORMULA, " PDATA ") != NULL); \
247 elf_arc_howto_table[TYPE].dst_mask = RELOC_FUNCTION(0, ~0); \
248 /* Only 32 bit data relocations should be marked as ME. */ \
249 if (strstr (#FORMULA, " ME ") != NULL) \
251 BFD_ASSERT (SIZE == 2); \
254 #include "elf/arc-reloc.def"
257 #undef ARC_RELOC_HOWTO
260 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
263 const int howto_table_lookup[] =
265 #include "elf/arc-reloc.def"
268 #undef ARC_RELOC_HOWTO
270 static reloc_howto_type *
271 arc_elf_howto (unsigned int r_type)
273 if (elf_arc_howto_table[R_ARC_32].dst_mask == 0)
274 arc_elf_howto_init ();
275 return &elf_arc_howto_table[r_type];
278 /* Map BFD reloc types to ARC ELF reloc types. */
282 bfd_reloc_code_real_type bfd_reloc_val;
283 unsigned char elf_reloc_val;
286 /* ARC ELF linker hash table. */
287 struct elf_arc_link_hash_table
289 struct elf_link_hash_table elf;
292 static struct bfd_hash_entry *
293 elf_arc_link_hash_newfunc (struct bfd_hash_entry *entry,
294 struct bfd_hash_table *table,
297 struct elf_arc_link_hash_entry * ret =
298 (struct elf_arc_link_hash_entry *) entry;
300 /* Allocate the structure if it has not already been allocated by a
303 ret = (struct elf_arc_link_hash_entry *)
304 bfd_hash_allocate (table, sizeof (struct elf_arc_link_hash_entry));
306 return (struct bfd_hash_entry *) ret;
308 /* Call the allocation method of the superclass. */
309 ret = ((struct elf_arc_link_hash_entry *)
310 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
314 ret->dyn_relocs = NULL;
315 ret->got_ents = NULL;
318 return (struct bfd_hash_entry *) ret;
321 /* Destroy an ARC ELF linker hash table. */
323 elf_arc_link_hash_table_free (bfd *obfd)
325 _bfd_elf_link_hash_table_free (obfd);
328 /* Create an ARC ELF linker hash table. */
330 static struct bfd_link_hash_table *
331 arc_elf_link_hash_table_create (bfd *abfd)
333 struct elf_arc_link_hash_table *ret;
335 ret = (struct elf_arc_link_hash_table *) bfd_zmalloc (sizeof (*ret));
339 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
340 elf_arc_link_hash_newfunc,
341 sizeof (struct elf_arc_link_hash_entry),
348 ret->elf.root.hash_table_free = elf_arc_link_hash_table_free;
350 return &ret->elf.root;
353 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
354 { BFD_RELOC_##TYPE, R_##TYPE },
356 static const struct arc_reloc_map arc_reloc_map[] =
358 #include "elf/arc-reloc.def"
360 {BFD_RELOC_NONE, R_ARC_NONE},
361 {BFD_RELOC_8, R_ARC_8},
362 {BFD_RELOC_16, R_ARC_16},
363 {BFD_RELOC_24, R_ARC_24},
364 {BFD_RELOC_32, R_ARC_32},
367 #undef ARC_RELOC_HOWTO
369 typedef ATTRIBUTE_UNUSED bfd_vma (*replace_func) (unsigned, int ATTRIBUTE_UNUSED);
371 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
373 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 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,
499 Elf_Internal_Rela * dst)
503 r_type = ELF32_R_TYPE (dst->r_info);
504 if (r_type >= (unsigned int) R_ARC_max)
506 /* xgettext:c-format */
507 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
509 bfd_set_error (bfd_error_bad_value);
513 cache_ptr->howto = arc_elf_howto (r_type);
517 /* Extract CPU features from an NTBS. */
520 arc_extract_features (const char *p)
527 for (i = 0; i < ARRAY_SIZE (bfd_feature_list); i++)
529 char *t = strstr (p, bfd_feature_list[i].attr);
530 unsigned l = strlen (bfd_feature_list[i].attr);
534 r |= bfd_feature_list[i].feature;
540 /* Concatenate two strings. s1 can be NULL but not
544 arc_stralloc (char * s1, const char * s2)
548 /* Only s1 can be null. */
551 p = s1 ? concat (s1, ",", s2, NULL) : (char *)s2;
556 /* Merge ARC object attributes from IBFD into OBFD. Raise an error if
557 there are conflicting attributes. */
560 arc_elf_merge_attributes (bfd *ibfd, struct bfd_link_info *info)
562 bfd *obfd = info->output_bfd;
563 obj_attribute *in_attr;
564 obj_attribute *out_attr;
566 bfd_boolean result = TRUE;
567 const char *sec_name = get_elf_backend_data (ibfd)->obj_attrs_section;
568 char *tagname = NULL;
570 /* Skip the linker stubs file. This preserves previous behavior
571 of accepting unknown attributes in the first input file - but
573 if (ibfd->flags & BFD_LINKER_CREATED)
576 /* Skip any input that hasn't attribute section.
577 This enables to link object files without attribute section with
579 if (bfd_get_section_by_name (ibfd, sec_name) == NULL)
582 if (!elf_known_obj_attributes_proc (obfd)[0].i)
584 /* This is the first object. Copy the attributes. */
585 _bfd_elf_copy_obj_attributes (ibfd, obfd);
587 out_attr = elf_known_obj_attributes_proc (obfd);
589 /* Use the Tag_null value to indicate the attributes have been
596 in_attr = elf_known_obj_attributes_proc (ibfd);
597 out_attr = elf_known_obj_attributes_proc (obfd);
599 for (i = LEAST_KNOWN_OBJ_ATTRIBUTE; i < NUM_KNOWN_OBJ_ATTRIBUTES; i++)
601 /* Merge this attribute with existing attributes. */
604 case Tag_ARC_PCS_config:
605 if (out_attr[i].i == 0)
606 out_attr[i].i = in_attr[i].i;
607 else if (in_attr[i].i != 0 && out_attr[i].i != in_attr[i].i)
609 const char *tagval[] = { "Absent", "Bare-metal/mwdt",
610 "Bare-metal/newlib", "Linux/uclibc",
612 BFD_ASSERT (in_attr[i].i < 5);
613 BFD_ASSERT (out_attr[i].i < 5);
614 /* It's sometimes ok to mix different configs, so this is only
617 (_("warning: %pB: conflicting platform configuration "
619 tagval[in_attr[i].i],
620 tagval[out_attr[i].i]);
624 case Tag_ARC_CPU_base:
625 if (out_attr[i].i == 0)
626 out_attr[i].i = in_attr[i].i;
627 else if (in_attr[i].i != 0 && out_attr[i].i != in_attr[i].i
628 && ((out_attr[i].i + in_attr[i].i) < 6))
630 const char *tagval[] = { "Absent", "ARC6xx", "ARC7xx",
632 BFD_ASSERT (in_attr[i].i < 5);
633 BFD_ASSERT (out_attr[i].i < 5);
634 /* We cannot mix code for different CPUs. */
636 (_("error: %pB: unable to merge CPU base attributes "
639 tagval[in_attr[i].i],
640 tagval[out_attr[i].i]);
646 /* The CPUs may be different, check if we can still mix
647 the objects against the output choosen CPU. */
648 unsigned in_feature = 0;
649 unsigned out_feature = 0;
650 char *p1 = in_attr[Tag_ARC_ISA_config].s;
651 char *p2 = out_attr[Tag_ARC_ISA_config].s;
654 unsigned opcode_map[] = {0, ARC_OPCODE_ARC600, ARC_OPCODE_ARC700,
655 ARC_OPCODE_ARCv2EM, ARC_OPCODE_ARCv2HS};
657 BFD_ASSERT (in_attr[i].i < (sizeof (opcode_map)
658 / sizeof (unsigned)));
659 BFD_ASSERT (out_attr[i].i < (sizeof (opcode_map)
660 / sizeof (unsigned)));
661 cpu_out = opcode_map[out_attr[i].i];
663 in_feature = arc_extract_features (p1);
664 out_feature = arc_extract_features (p2);
666 /* First, check if a feature is compatible with the
667 output object chosen CPU. */
668 for (j = 0; j < ARRAY_SIZE (bfd_feature_list); j++)
669 if (((in_feature | out_feature) & bfd_feature_list[j].feature)
670 && (!(cpu_out & bfd_feature_list[j].cpus)))
673 (_("error: %pB: unable to merge ISA extension attributes "
675 obfd, bfd_feature_list[j].name);
679 /* Second, if we have compatible features with the
680 chosen CPU, check if they are compatible among
682 for (j = 0; j < ARRAY_SIZE (bfd_conflict_list); j++)
683 if (((in_feature | out_feature) & bfd_conflict_list[j])
684 == bfd_conflict_list[j])
687 for (k = 0; k < ARRAY_SIZE (bfd_feature_list); k++)
689 if (in_feature & bfd_feature_list[k].feature
690 & bfd_conflict_list[j])
691 p1 = (char *) bfd_feature_list[k].name;
692 if (out_feature & bfd_feature_list[k].feature
693 & bfd_conflict_list[j])
694 p2 = (char *) bfd_feature_list[k].name;
697 (_("error: %pB: conflicting ISA extension attributes "
703 /* Everithing is alright. */
704 out_feature |= in_feature;
706 for (j = 0; j < ARRAY_SIZE (bfd_feature_list); j++)
707 if (out_feature & bfd_feature_list[j].feature)
708 p1 = arc_stralloc (p1, bfd_feature_list[j].attr);
710 out_attr[Tag_ARC_ISA_config].s =
711 _bfd_elf_attr_strdup (obfd, p1);
714 case Tag_ARC_CPU_variation:
715 case Tag_ARC_ISA_mpy_option:
716 case Tag_ARC_ABI_osver:
717 /* Use the largest value specified. */
718 if (in_attr[i].i > out_attr[i].i)
719 out_attr[i].i = in_attr[i].i;
722 /* The CPU name is given by the vendor, just choose an
723 existing one if missing or different. There are no fail
724 criteria if they different or both missing. */
725 case Tag_ARC_CPU_name:
726 if (!out_attr[i].s && in_attr[i].s)
727 out_attr[i].s = _bfd_elf_attr_strdup (obfd, in_attr[i].s);
730 case Tag_ARC_ABI_rf16:
731 if (out_attr[i].i == 0)
732 out_attr[i].i = in_attr[i].i;
733 else if (out_attr[i].i != in_attr[i].i)
735 /* We cannot mix code with rf16 and without. */
737 (_("error: %pB: cannot mix rf16 with full register set %pB"),
743 case Tag_ARC_ABI_pic:
746 case Tag_ARC_ABI_sda:
750 case Tag_ARC_ABI_tls:
752 const char *tagval[] = { "Absent", "MWDT", "GNU" };
757 BFD_ASSERT (in_attr[i].i < 3);
758 BFD_ASSERT (out_attr[i].i < 3);
759 if (out_attr[i].i == 0)
760 out_attr[i].i = in_attr[i].i;
761 else if (out_attr[i].i != 0 && in_attr[i].i != 0
762 && out_attr[i].i != in_attr[i].i)
765 (_("error: %pB: conflicting attributes %s: %s with %s"),
767 tagval[in_attr[i].i],
768 tagval[out_attr[i].i]);
775 case Tag_ARC_ABI_double_size:
776 tagname = "Double size";
778 case Tag_ARC_ABI_enumsize:
780 tagname = "Enum size";
782 case Tag_ARC_ABI_exceptions:
784 tagname = "ABI exceptions";
786 if (out_attr[i].i == 0)
787 out_attr[i].i = in_attr[i].i;
788 else if (out_attr[i].i != 0 && in_attr[i].i != 0
789 && out_attr[i].i != in_attr[i].i)
792 (_("error: %pB: conflicting attributes %s"),
798 case Tag_ARC_ISA_apex:
799 break; /* Do nothing for APEX attributes. */
801 case Tag_ARC_ISA_config:
802 /* It is handled in Tag_ARC_CPU_base. */
805 case Tag_ARC_ATR_version:
806 if (out_attr[i].i == 0)
807 out_attr[i].i = in_attr[i].i;
812 = result && _bfd_elf_merge_unknown_attribute_low (ibfd, obfd, i);
815 /* If out_attr was copied from in_attr then it won't have a type yet. */
816 if (in_attr[i].type && !out_attr[i].type)
817 out_attr[i].type = in_attr[i].type;
820 /* Merge Tag_compatibility attributes and any common GNU ones. */
821 if (!_bfd_elf_merge_object_attributes (ibfd, info))
824 /* Check for any attributes not known on ARC. */
825 result &= _bfd_elf_merge_unknown_attribute_list (ibfd, obfd);
830 /* Merge backend specific data from an object file to the output
831 object file when linking. */
834 arc_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
836 bfd *obfd = info->output_bfd;
837 unsigned short mach_ibfd;
838 static unsigned short mach_obfd = EM_NONE;
843 /* Check if we have the same endianess. */
844 if (! _bfd_generic_verify_endian_match (ibfd, info))
847 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
848 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
851 /* Collect ELF flags. */
852 in_flags = elf_elfheader (ibfd)->e_flags & EF_ARC_MACH_MSK;
853 out_flags = elf_elfheader (obfd)->e_flags & EF_ARC_MACH_MSK;
855 if (!elf_flags_init (obfd)) /* First call, no flags set. */
857 elf_flags_init (obfd) = TRUE;
858 out_flags = in_flags;
861 if (!arc_elf_merge_attributes (ibfd, info))
864 /* Check to see if the input BFD actually contains any sections. Do
865 not short-circuit dynamic objects; their section list may be
866 emptied by elf_link_add_object_symbols. */
867 if (!(ibfd->flags & DYNAMIC))
869 bfd_boolean null_input_bfd = TRUE;
870 bfd_boolean only_data_sections = TRUE;
872 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
874 if ((bfd_get_section_flags (ibfd, sec)
875 & (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
876 == (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
877 only_data_sections = FALSE;
879 null_input_bfd = FALSE;
882 if (null_input_bfd || only_data_sections)
886 /* Complain about various flag/architecture mismatches. */
887 mach_ibfd = elf_elfheader (ibfd)->e_machine;
888 if (mach_obfd == EM_NONE)
890 mach_obfd = mach_ibfd;
894 if (mach_ibfd != mach_obfd)
896 /* xgettext:c-format */
897 _bfd_error_handler (_("error: attempting to link %pB "
898 "with a binary %pB of different architecture"),
902 else if ((in_flags != out_flags)
903 /* If we have object attributes, then we already
904 checked the objects compatibility, skip it. */
905 && !bfd_elf_get_obj_attr_int (ibfd, OBJ_ATTR_PROC,
908 if (in_flags && out_flags)
910 /* Warn if different flags. */
912 /* xgettext:c-format */
913 (_("%pB: uses different e_flags (%#x) fields than "
914 "previous modules (%#x)"),
915 ibfd, in_flags, out_flags);
918 /* MWDT doesnt set the eflags hence make sure we choose the
919 eflags set by gcc. */
920 in_flags = in_flags > out_flags ? in_flags : out_flags;
924 /* Everything is correct; don't change the output flags. */
925 in_flags = out_flags;
929 /* Update the flags. */
930 elf_elfheader (obfd)->e_flags = in_flags;
932 if (bfd_get_mach (obfd) < bfd_get_mach (ibfd))
934 return bfd_set_arch_mach (obfd, bfd_arch_arc, bfd_get_mach (ibfd));
940 /* Return a best guess for the machine number based on the attributes. */
943 bfd_arc_get_mach_from_attributes (bfd * abfd)
945 int arch = bfd_elf_get_obj_attr_int (abfd, OBJ_ATTR_PROC, Tag_ARC_CPU_base);
946 unsigned e_machine = elf_elfheader (abfd)->e_machine;
951 return bfd_mach_arc_arc600;
953 return bfd_mach_arc_arc700;
956 return bfd_mach_arc_arcv2;
960 return (e_machine == EM_ARC_COMPACT)
961 ? bfd_mach_arc_arc700 : bfd_mach_arc_arcv2;
964 /* Set the right machine number for an ARC ELF file. */
966 arc_elf_object_p (bfd * abfd)
968 /* Make sure this is initialised, or you'll have the potential of passing
969 garbage---or misleading values---into the call to
970 bfd_default_set_arch_mach (). */
971 unsigned int mach = bfd_mach_arc_arc700;
972 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH_MSK;
973 unsigned e_machine = elf_elfheader (abfd)->e_machine;
975 if (e_machine == EM_ARC_COMPACT || e_machine == EM_ARC_COMPACT2)
979 case E_ARC_MACH_ARC600:
980 mach = bfd_mach_arc_arc600;
982 case E_ARC_MACH_ARC601:
983 mach = bfd_mach_arc_arc601;
985 case E_ARC_MACH_ARC700:
986 mach = bfd_mach_arc_arc700;
988 case EF_ARC_CPU_ARCV2HS:
989 case EF_ARC_CPU_ARCV2EM:
990 mach = bfd_mach_arc_arcv2;
993 mach = bfd_arc_get_mach_from_attributes (abfd);
999 if (e_machine == EM_ARC)
1002 (_("error: the ARC4 architecture is no longer supported"));
1008 (_("warning: unset or old architecture flags; "
1009 "use default machine"));
1013 return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
1016 /* The final processing done just before writing out an ARC ELF object file.
1017 This gets the ARC architecture right based on the machine number. */
1020 arc_elf_final_write_processing (bfd * abfd,
1021 bfd_boolean linker ATTRIBUTE_UNUSED)
1024 int osver = bfd_elf_get_obj_attr_int (abfd, OBJ_ATTR_PROC,
1026 flagword e_flags = elf_elfheader (abfd)->e_flags & ~EF_ARC_OSABI_MSK;
1028 switch (bfd_get_mach (abfd))
1030 case bfd_mach_arc_arc600:
1031 emf = EM_ARC_COMPACT;
1033 case bfd_mach_arc_arc601:
1034 emf = EM_ARC_COMPACT;
1036 case bfd_mach_arc_arc700:
1037 emf = EM_ARC_COMPACT;
1039 case bfd_mach_arc_arcv2:
1040 emf = EM_ARC_COMPACT2;
1046 elf_elfheader (abfd)->e_machine = emf;
1048 /* Record whatever is the current syscall ABI version. */
1050 e_flags |= ((osver & 0x0f) << 8);
1052 e_flags |= E_ARC_OSABI_V3;
1054 elf_elfheader (abfd)->e_flags |= e_flags;
1057 #ifdef ARC_ENABLE_DEBUG
1058 #define DEBUG_ARC_RELOC(A) debug_arc_reloc (A)
1061 debug_arc_reloc (struct arc_relocation_data reloc_data)
1063 ARC_DEBUG ("Reloc type=%s, should_relocate = %s\n",
1064 reloc_data.howto->name,
1065 reloc_data.should_relocate ? "true" : "false");
1066 ARC_DEBUG (" offset = 0x%x, addend = 0x%x\n",
1067 (unsigned int) reloc_data.reloc_offset,
1068 (unsigned int) reloc_data.reloc_addend);
1069 ARC_DEBUG (" Symbol:\n");
1070 ARC_DEBUG (" value = 0x%08x\n",
1071 (unsigned int) reloc_data.sym_value);
1072 if (reloc_data.sym_section != NULL)
1074 ARC_DEBUG (" Symbol Section:\n");
1075 ARC_DEBUG (" section name = %s, output_offset 0x%08x",
1076 reloc_data.sym_section->name,
1077 (unsigned int) reloc_data.sym_section->output_offset);
1078 if (reloc_data.sym_section->output_section != NULL)
1079 ARC_DEBUG (", output_section->vma = 0x%08x",
1080 ((unsigned int) reloc_data.sym_section->output_section->vma));
1082 if (reloc_data.sym_section->owner && reloc_data.sym_section->owner->filename)
1083 ARC_DEBUG (" file: %s\n", reloc_data.sym_section->owner->filename);
1087 ARC_DEBUG (" symbol section is NULL\n");
1090 ARC_DEBUG (" Input_section:\n");
1091 if (reloc_data.input_section != NULL)
1093 ARC_DEBUG (" section name = %s, output_offset 0x%08x, output_section->vma = 0x%08x\n",
1094 reloc_data.input_section->name,
1095 (unsigned int) reloc_data.input_section->output_offset,
1096 (unsigned int) reloc_data.input_section->output_section->vma);
1097 ARC_DEBUG (" changed_address = 0x%08x\n",
1098 (unsigned int) (reloc_data.input_section->output_section->vma
1099 + reloc_data.input_section->output_offset
1100 + reloc_data.reloc_offset));
1101 ARC_DEBUG (" file: %s\n", reloc_data.input_section->owner->filename);
1105 ARC_DEBUG (" input section is NULL\n");
1109 #define DEBUG_ARC_RELOC(A)
1110 #endif /* ARC_ENABLE_DEBUG */
1113 middle_endian_convert (bfd_vma insn, bfd_boolean do_it)
1118 = ((insn & 0xffff0000) >> 16)
1119 | ((insn & 0xffff) << 16);
1124 /* This function is called for relocations that are otherwise marked as NOT
1125 requiring overflow checks. In here we perform non-standard checks of
1126 the relocation value. */
1128 static inline bfd_reloc_status_type
1129 arc_special_overflow_checks (const struct arc_relocation_data reloc_data,
1130 bfd_signed_vma relocation,
1131 struct bfd_link_info *info ATTRIBUTE_UNUSED)
1133 switch (reloc_data.howto->type)
1135 case R_ARC_NPS_CMEM16:
1136 if (((relocation >> 16) & 0xffff) != NPS_CMEM_HIGH_VALUE)
1138 if (reloc_data.reloc_addend == 0)
1140 /* xgettext:c-format */
1141 (_("%pB(%pA+%#" PRIx64 "): CMEM relocation to `%s' is invalid, "
1142 "16 MSB should be %#x (value is %#" PRIx64 ")"),
1143 reloc_data.input_section->owner,
1144 reloc_data.input_section,
1145 (uint64_t) reloc_data.reloc_offset,
1146 reloc_data.symbol_name,
1147 NPS_CMEM_HIGH_VALUE,
1148 (uint64_t) relocation);
1151 /* xgettext:c-format */
1152 (_("%pB(%pA+%#" PRIx64 "): CMEM relocation to `%s+%#" PRIx64
1153 "' is invalid, 16 MSB should be %#x (value is %#" PRIx64 ")"),
1154 reloc_data.input_section->owner,
1155 reloc_data.input_section,
1156 (uint64_t) reloc_data.reloc_offset,
1157 reloc_data.symbol_name,
1158 (uint64_t) reloc_data.reloc_addend,
1159 NPS_CMEM_HIGH_VALUE,
1160 (uint64_t) relocation);
1161 return bfd_reloc_overflow;
1169 return bfd_reloc_ok;
1172 #define ME(reloc) (reloc)
1174 #define IS_ME(FORMULA,BFD) ((strstr (FORMULA, "ME") != NULL) \
1175 && (!bfd_big_endian (BFD)))
1177 #define S ((bfd_signed_vma) (reloc_data.sym_value \
1178 + (reloc_data.sym_section->output_section != NULL ? \
1179 (reloc_data.sym_section->output_offset \
1180 + reloc_data.sym_section->output_section->vma) : 0)))
1181 #define L ((bfd_signed_vma) (reloc_data.sym_value \
1182 + (reloc_data.sym_section->output_section != NULL ? \
1183 (reloc_data.sym_section->output_offset \
1184 + reloc_data.sym_section->output_section->vma) : 0)))
1185 #define A (reloc_data.reloc_addend)
1187 #define G (reloc_data.got_offset_value)
1188 #define GOT (reloc_data.got_symbol_vma)
1189 #define GOT_BEGIN (htab->sgot->output_section->vma)
1192 /* P: relative offset to PCL The offset should be to the
1193 current location aligned to 32 bits. */
1194 #define P ((bfd_signed_vma) ( \
1196 (reloc_data.input_section->output_section != NULL ? \
1197 reloc_data.input_section->output_section->vma : 0) \
1198 + reloc_data.input_section->output_offset \
1199 + (reloc_data.reloc_offset - (bitsize >= 32 ? 4 : 0))) \
1201 #define PDATA ((bfd_signed_vma) ( \
1202 (reloc_data.input_section->output_section->vma \
1203 + reloc_data.input_section->output_offset \
1204 + (reloc_data.reloc_offset))))
1205 #define SECTSTART (bfd_signed_vma) (reloc_data.sym_section->output_section->vma \
1206 + reloc_data.sym_section->output_offset)
1207 #define FINAL_SECTSTART \
1208 (bfd_signed_vma) (reloc_data.sym_section->output_section->vma)
1209 #define JLI (bfd_signed_vma) (reloc_data.sym_section->output_section->vma)
1210 #define _SDA_BASE_ (bfd_signed_vma) (reloc_data.sdata_begin_symbol_vma)
1211 #define TLS_REL (bfd_signed_vma) \
1212 ((elf_hash_table (info))->tls_sec->output_section->vma)
1213 #define TLS_TBSS (align_power(TCB_SIZE, \
1214 reloc_data.sym_section->alignment_power))
1218 #ifdef ARC_ENABLE_DEBUG
1219 #define PRINT_DEBUG_RELOC_INFO_BEFORE(FORMULA, TYPE) \
1222 asection *sym_section = reloc_data.sym_section; \
1223 asection *input_section = reloc_data.input_section; \
1224 ARC_DEBUG ("RELOC_TYPE = " TYPE "\n"); \
1225 ARC_DEBUG ("FORMULA = " FORMULA "\n"); \
1226 ARC_DEBUG ("S = %#lx\n", S); \
1227 ARC_DEBUG ("A = %#lx\n", A); \
1228 ARC_DEBUG ("L = %lx\n", L); \
1229 if (sym_section->output_section != NULL) \
1230 ARC_DEBUG ("symbol_section->vma = %#lx\n", \
1231 sym_section->output_section->vma \
1232 + sym_section->output_offset); \
1234 ARC_DEBUG ("symbol_section->vma = NULL\n"); \
1235 if (input_section->output_section != NULL) \
1236 ARC_DEBUG ("symbol_section->vma = %#lx\n", \
1237 input_section->output_section->vma \
1238 + input_section->output_offset); \
1240 ARC_DEBUG ("symbol_section->vma = NULL\n"); \
1241 ARC_DEBUG ("PCL = %#lx\n", P); \
1242 ARC_DEBUG ("P = %#lx\n", P); \
1243 ARC_DEBUG ("G = %#lx\n", G); \
1244 ARC_DEBUG ("SDA_OFFSET = %#lx\n", _SDA_BASE_); \
1245 ARC_DEBUG ("SDA_SET = %d\n", reloc_data.sdata_begin_symbol_vma_set); \
1246 ARC_DEBUG ("GOT_OFFSET = %#lx\n", GOT); \
1247 ARC_DEBUG ("relocation = %#08lx\n", relocation); \
1248 ARC_DEBUG ("before = %#08x\n", (unsigned) insn); \
1249 ARC_DEBUG ("data = %08x (%u) (%d)\n", (unsigned) relocation, \
1250 (unsigned) relocation, (int) relocation); \
1254 #define PRINT_DEBUG_RELOC_INFO_AFTER \
1257 ARC_DEBUG ("after = 0x%08x\n", (unsigned int) insn); \
1263 #define PRINT_DEBUG_RELOC_INFO_BEFORE(...)
1264 #define PRINT_DEBUG_RELOC_INFO_AFTER
1266 #endif /* ARC_ENABLE_DEBUG */
1268 #define ARC_RELOC_HOWTO(TYPE, VALUE, SIZE, BITSIZE, RELOC_FUNCTION, OVERFLOW, FORMULA) \
1271 bfd_signed_vma bitsize ATTRIBUTE_UNUSED = BITSIZE; \
1272 relocation = FORMULA ; \
1273 PRINT_DEBUG_RELOC_INFO_BEFORE (#FORMULA, #TYPE); \
1274 insn = middle_endian_convert (insn, IS_ME (#FORMULA, abfd)); \
1275 insn = (* get_replace_function (abfd, TYPE)) (insn, relocation); \
1276 insn = middle_endian_convert (insn, IS_ME (#FORMULA, abfd)); \
1277 PRINT_DEBUG_RELOC_INFO_AFTER; \
1281 static bfd_reloc_status_type
1282 arc_do_relocation (bfd_byte * contents,
1283 struct arc_relocation_data reloc_data,
1284 struct bfd_link_info *info)
1286 bfd_signed_vma relocation = 0;
1288 bfd_vma orig_insn ATTRIBUTE_UNUSED;
1289 bfd * abfd = reloc_data.input_section->owner;
1290 struct elf_link_hash_table *htab ATTRIBUTE_UNUSED = elf_hash_table (info);
1291 bfd_reloc_status_type flag;
1293 if (!reloc_data.should_relocate)
1294 return bfd_reloc_ok;
1296 switch (reloc_data.howto->size)
1299 insn = arc_bfd_get_32 (abfd,
1300 contents + reloc_data.reloc_offset,
1301 reloc_data.input_section);
1304 insn = arc_bfd_get_16 (abfd,
1305 contents + reloc_data.reloc_offset,
1306 reloc_data.input_section);
1309 insn = arc_bfd_get_8 (abfd,
1310 contents + reloc_data.reloc_offset,
1311 reloc_data.input_section);
1321 switch (reloc_data.howto->type)
1323 #include "elf/arc-reloc.def"
1330 /* Check for relocation overflow. */
1331 if (reloc_data.howto->complain_on_overflow != complain_overflow_dont)
1332 flag = bfd_check_overflow (reloc_data.howto->complain_on_overflow,
1333 reloc_data.howto->bitsize,
1334 reloc_data.howto->rightshift,
1335 bfd_arch_bits_per_address (abfd),
1338 flag = arc_special_overflow_checks (reloc_data, relocation, info);
1340 if (flag != bfd_reloc_ok)
1342 ARC_DEBUG ("Relocation overflows !\n");
1343 DEBUG_ARC_RELOC (reloc_data);
1344 ARC_DEBUG ("Relocation value = signed -> %d, unsigned -> %u"
1345 ", hex -> (0x%08x)\n",
1346 (int) relocation, (unsigned) relocation, (int) relocation);
1351 /* Write updated instruction back to memory. */
1352 switch (reloc_data.howto->size)
1355 arc_bfd_put_32 (abfd, insn,
1356 contents + reloc_data.reloc_offset,
1357 reloc_data.input_section);
1360 arc_bfd_put_16 (abfd, insn,
1361 contents + reloc_data.reloc_offset,
1362 reloc_data.input_section);
1365 arc_bfd_put_8 (abfd, insn,
1366 contents + reloc_data.reloc_offset,
1367 reloc_data.input_section);
1370 ARC_DEBUG ("size = %d\n", reloc_data.howto->size);
1375 return bfd_reloc_ok;
1391 #undef ARC_RELOC_HOWTO
1394 /* Relocate an arc ELF section.
1395 Function : elf_arc_relocate_section
1396 Brief : Relocate an arc section, by handling all the relocations
1397 appearing in that section.
1398 Args : output_bfd : The bfd being written to.
1399 info : Link information.
1400 input_bfd : The input bfd.
1401 input_section : The section being relocated.
1402 contents : contents of the section being relocated.
1403 relocs : List of relocations in the section.
1404 local_syms : is a pointer to the swapped in local symbols.
1405 local_section : is an array giving the section in the input file
1406 corresponding to the st_shndx field of each
1409 elf_arc_relocate_section (bfd * output_bfd,
1410 struct bfd_link_info * info,
1412 asection * input_section,
1413 bfd_byte * contents,
1414 Elf_Internal_Rela * relocs,
1415 Elf_Internal_Sym * local_syms,
1416 asection ** local_sections)
1418 Elf_Internal_Shdr * symtab_hdr;
1419 struct elf_link_hash_entry ** sym_hashes;
1420 Elf_Internal_Rela * rel;
1421 Elf_Internal_Rela * wrel;
1422 Elf_Internal_Rela * relend;
1423 struct elf_link_hash_table * htab = elf_hash_table (info);
1425 symtab_hdr = &((elf_tdata (input_bfd))->symtab_hdr);
1426 sym_hashes = elf_sym_hashes (input_bfd);
1428 rel = wrel = relocs;
1429 relend = relocs + input_section->reloc_count;
1430 for (; rel < relend; wrel++, rel++)
1432 enum elf_arc_reloc_type r_type;
1433 reloc_howto_type * howto;
1434 unsigned long r_symndx;
1435 struct elf_link_hash_entry * h;
1436 Elf_Internal_Sym * sym;
1438 struct elf_link_hash_entry * h2;
1440 bfd_boolean unresolved_reloc = FALSE;
1442 struct arc_relocation_data reloc_data =
1446 .got_offset_value = 0,
1448 .sym_section = NULL,
1450 .input_section = NULL,
1451 .sdata_begin_symbol_vma = 0,
1452 .sdata_begin_symbol_vma_set = FALSE,
1453 .got_symbol_vma = 0,
1454 .should_relocate = FALSE
1457 r_type = ELF32_R_TYPE (rel->r_info);
1459 if (r_type >= (int) R_ARC_max)
1461 bfd_set_error (bfd_error_bad_value);
1464 howto = arc_elf_howto (r_type);
1466 r_symndx = ELF32_R_SYM (rel->r_info);
1468 /* If we are generating another .o file and the symbol in not
1469 local, skip this relocation. */
1470 if (bfd_link_relocatable (info))
1472 /* This is a relocateable link. We don't have to change
1473 anything, unless the reloc is against a section symbol,
1474 in which case we have to adjust according to where the
1475 section symbol winds up in the output section. */
1477 /* Checks if this is a local symbol and thus the reloc
1478 might (will??) be against a section symbol. */
1479 if (r_symndx < symtab_hdr->sh_info)
1481 sym = local_syms + r_symndx;
1482 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1484 sec = local_sections[r_symndx];
1486 /* For RELA relocs. Just adjust the addend
1487 value in the relocation entry. */
1488 rel->r_addend += sec->output_offset + sym->st_value;
1490 ARC_DEBUG ("local symbols reloc (section=%d %s) seen in %s\n",
1491 (int) r_symndx, local_sections[r_symndx]->name,
1492 __PRETTY_FUNCTION__);
1497 h2 = elf_link_hash_lookup (elf_hash_table (info), "__SDATA_BEGIN__",
1498 FALSE, FALSE, TRUE);
1500 if (!reloc_data.sdata_begin_symbol_vma_set
1501 && h2 != NULL && h2->root.type != bfd_link_hash_undefined
1502 && h2->root.u.def.section->output_section != NULL)
1503 /* TODO: Verify this condition. */
1505 reloc_data.sdata_begin_symbol_vma =
1506 (h2->root.u.def.value
1507 + h2->root.u.def.section->output_section->vma);
1508 reloc_data.sdata_begin_symbol_vma_set = TRUE;
1511 reloc_data.input_section = input_section;
1512 reloc_data.howto = howto;
1513 reloc_data.reloc_offset = rel->r_offset;
1514 reloc_data.reloc_addend = rel->r_addend;
1516 /* This is a final link. */
1521 if (r_symndx < symtab_hdr->sh_info) /* A local symbol. */
1523 sym = local_syms + r_symndx;
1524 sec = local_sections[r_symndx];
1528 bfd_boolean warned, ignored;
1529 bfd_vma relocation ATTRIBUTE_UNUSED;
1531 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
1532 r_symndx, symtab_hdr, sym_hashes,
1534 unresolved_reloc, warned, ignored);
1536 /* TODO: This code is repeated from below. We should
1537 clean it and remove duplications.
1538 Sec is used check for discarded sections.
1539 Need to redesign code below. */
1541 /* Get the symbol's entry in the symtab. */
1542 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1544 while (h->root.type == bfd_link_hash_indirect
1545 || h->root.type == bfd_link_hash_warning)
1546 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1548 /* If we have encountered a definition for this symbol. */
1549 if (h->root.type == bfd_link_hash_defined
1550 || h->root.type == bfd_link_hash_defweak)
1552 reloc_data.sym_value = h->root.u.def.value;
1553 sec = h->root.u.def.section;
1557 /* Clean relocs for symbols in discarded sections. */
1558 if (sec != NULL && discarded_section (sec))
1560 _bfd_clear_contents (howto, input_bfd, input_section,
1561 contents, rel->r_offset);
1565 /* For ld -r, remove relocations in debug sections against
1566 sections defined in discarded sections. Not done for
1567 eh_frame editing code expects to be present. */
1568 if (bfd_link_relocatable (info)
1569 && (input_section->flags & SEC_DEBUGGING))
1575 if (bfd_link_relocatable (info))
1582 if (r_symndx < symtab_hdr->sh_info) /* A local symbol. */
1584 reloc_data.sym_value = sym->st_value;
1585 reloc_data.sym_section = sec;
1586 reloc_data.symbol_name =
1587 bfd_elf_string_from_elf_section (input_bfd,
1588 symtab_hdr->sh_link,
1591 /* Mergeable section handling. */
1592 if ((sec->flags & SEC_MERGE)
1593 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1597 rel->r_addend = _bfd_elf_rel_local_sym (output_bfd, sym,
1598 &msec, rel->r_addend);
1599 rel->r_addend -= (sec->output_section->vma
1600 + sec->output_offset
1602 rel->r_addend += msec->output_section->vma + msec->output_offset;
1604 reloc_data.reloc_addend = rel->r_addend;
1607 BFD_ASSERT (htab->sgot != NULL || !is_reloc_for_GOT (howto));
1608 if (htab->sgot != NULL)
1609 reloc_data.got_symbol_vma = htab->sgot->output_section->vma
1610 + htab->sgot->output_offset;
1612 reloc_data.should_relocate = TRUE;
1614 else /* Global symbol. */
1616 /* FIXME: We should use the RELOC_FOR_GLOBAL_SYMBOL macro
1617 (defined in elf-bfd.h) here. */
1619 /* Get the symbol's entry in the symtab. */
1620 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1622 while (h->root.type == bfd_link_hash_indirect
1623 || h->root.type == bfd_link_hash_warning)
1625 struct elf_arc_link_hash_entry *ah_old =
1626 (struct elf_arc_link_hash_entry *) h;
1627 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1628 struct elf_arc_link_hash_entry *ah =
1629 (struct elf_arc_link_hash_entry *) h;
1631 if (ah->got_ents == 0 && ah_old->got_ents != ah->got_ents)
1632 ah->got_ents = ah_old->got_ents;
1635 /* TODO: Need to validate what was the intention. */
1636 /* BFD_ASSERT ((h->dynindx == -1) || (h->forced_local != 0)); */
1637 reloc_data.symbol_name = h->root.root.string;
1639 /* If we have encountered a definition for this symbol. */
1640 if (h->root.type == bfd_link_hash_defined
1641 || h->root.type == bfd_link_hash_defweak)
1643 reloc_data.sym_value = h->root.u.def.value;
1644 reloc_data.sym_section = h->root.u.def.section;
1646 reloc_data.should_relocate = TRUE;
1648 if (is_reloc_for_GOT (howto) && !bfd_link_pic (info))
1650 struct elf_arc_link_hash_entry *ah =
1651 (struct elf_arc_link_hash_entry *) h;
1652 /* TODO: Change it to use arc_do_relocation with
1653 ARC_32 reloc. Try to use ADD_RELA macro. */
1654 bfd_vma relocation =
1655 reloc_data.sym_value + reloc_data.reloc_addend
1656 + (reloc_data.sym_section->output_section != NULL ?
1657 (reloc_data.sym_section->output_offset
1658 + reloc_data.sym_section->output_section->vma)
1661 BFD_ASSERT (ah->got_ents);
1662 bfd_vma got_offset = ah->got_ents->offset;
1663 bfd_put_32 (output_bfd, relocation,
1664 htab->sgot->contents + got_offset);
1666 if (is_reloc_for_PLT (howto) && h->plt.offset != (bfd_vma) -1)
1668 /* TODO: This is repeated up here. */
1669 reloc_data.sym_value = h->plt.offset;
1670 reloc_data.sym_section = htab->splt;
1673 else if (h->root.type == bfd_link_hash_undefweak)
1675 /* Is weak symbol and has no definition. */
1676 if (is_reloc_for_GOT (howto))
1678 reloc_data.sym_value = h->root.u.def.value;
1679 reloc_data.sym_section = htab->sgot;
1680 reloc_data.should_relocate = TRUE;
1682 else if (is_reloc_for_PLT (howto)
1683 && h->plt.offset != (bfd_vma) -1)
1685 /* TODO: This is repeated up here. */
1686 reloc_data.sym_value = h->plt.offset;
1687 reloc_data.sym_section = htab->splt;
1688 reloc_data.should_relocate = TRUE;
1695 if (is_reloc_for_GOT (howto))
1697 reloc_data.sym_value = h->root.u.def.value;
1698 reloc_data.sym_section = htab->sgot;
1700 reloc_data.should_relocate = TRUE;
1702 else if (is_reloc_for_PLT (howto))
1704 /* Fail if it is linking for PIE and the symbol is
1706 if (bfd_link_executable (info))
1707 (*info->callbacks->undefined_symbol)
1708 (info, h->root.root.string, input_bfd, input_section,
1709 rel->r_offset, TRUE);
1710 reloc_data.sym_value = h->plt.offset;
1711 reloc_data.sym_section = htab->splt;
1713 reloc_data.should_relocate = TRUE;
1715 else if (!bfd_link_pic (info) || bfd_link_executable (info))
1716 (*info->callbacks->undefined_symbol)
1717 (info, h->root.root.string, input_bfd, input_section,
1718 rel->r_offset, TRUE);
1721 BFD_ASSERT (htab->sgot != NULL || !is_reloc_for_GOT (howto));
1722 if (htab->sgot != NULL)
1723 reloc_data.got_symbol_vma = htab->sgot->output_section->vma
1724 + htab->sgot->output_offset;
1727 if ((is_reloc_for_GOT (howto)
1728 || is_reloc_for_TLS (howto)))
1730 reloc_data.should_relocate = TRUE;
1732 struct got_entry **list
1733 = get_got_entry_list_for_symbol (input_bfd, r_symndx, h);
1735 reloc_data.got_offset_value
1736 = relocate_fix_got_relocs_for_got_info (list,
1737 tls_type_for_reloc (howto),
1748 create_got_dynrelocs_for_single_entry (
1749 got_entry_for_type (list,
1750 arc_got_entry_type_for_reloc (howto)),
1751 output_bfd, info, NULL);
1756 #define IS_ARC_PCREL_TYPE(TYPE) \
1757 ( (TYPE == R_ARC_PC32) \
1758 || (TYPE == R_ARC_32_PCREL))
1765 case R_ARC_32_PCREL:
1766 if (bfd_link_pic (info)
1767 && (!IS_ARC_PCREL_TYPE (r_type)
1771 && (!info->symbolic || !h->def_regular))))
1773 Elf_Internal_Rela outrel;
1775 bfd_boolean skip = FALSE;
1776 bfd_boolean relocate = FALSE;
1777 asection *sreloc = _bfd_elf_get_dynamic_reloc_section
1778 (input_bfd, input_section,
1781 BFD_ASSERT (sreloc != NULL);
1783 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
1788 if (outrel.r_offset == (bfd_vma) -1)
1791 outrel.r_addend = rel->r_addend;
1792 outrel.r_offset += (input_section->output_section->vma
1793 + input_section->output_offset);
1797 memset (&outrel, 0, sizeof outrel);
1802 && (IS_ARC_PCREL_TYPE (r_type)
1803 || !(bfd_link_executable (info)
1804 || SYMBOLIC_BIND (info, h))
1805 || ! h->def_regular))
1807 BFD_ASSERT (h != NULL);
1808 if ((input_section->flags & SEC_ALLOC) != 0)
1813 BFD_ASSERT (h->dynindx != -1);
1814 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1818 /* Handle local symbols, they either do not have a
1819 global hash table entry (h == NULL), or are
1820 forced local due to a version script
1821 (h->forced_local), or the third condition is
1822 legacy, it appears to say something like, for
1823 links where we are pre-binding the symbols, or
1824 there's not an entry for this symbol in the
1825 dynamic symbol table, and it's a regular symbol
1826 not defined in a shared object, then treat the
1827 symbol as local, resolve it now. */
1829 /* outrel.r_addend = 0; */
1830 outrel.r_info = ELF32_R_INFO (0, R_ARC_RELATIVE);
1833 BFD_ASSERT (sreloc->contents != 0);
1835 loc = sreloc->contents;
1836 loc += sreloc->reloc_count * sizeof (Elf32_External_Rela);
1837 sreloc->reloc_count += 1;
1839 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1849 if (is_reloc_SDA_relative (howto)
1850 && !reloc_data.sdata_begin_symbol_vma_set)
1853 ("error: linker symbol __SDATA_BEGIN__ not found");
1854 bfd_set_error (bfd_error_bad_value);
1858 DEBUG_ARC_RELOC (reloc_data);
1860 /* Make sure we have with a dynamic linker. In case of GOT and PLT
1861 the sym_section should point to .got or .plt respectively. */
1862 if ((is_reloc_for_GOT (howto) || is_reloc_for_PLT (howto))
1863 && reloc_data.sym_section == NULL)
1866 (_("GOT and PLT relocations cannot be fixed with a non dynamic linker"));
1867 bfd_set_error (bfd_error_bad_value);
1872 switch (arc_do_relocation (contents, reloc_data, info))
1875 continue; /* The reloc processing loop. */
1877 case bfd_reloc_overflow:
1878 (*info->callbacks->reloc_overflow)
1879 (info, (h ? &h->root : NULL), reloc_data.symbol_name, howto->name, (bfd_vma) 0,
1880 input_bfd, input_section, rel->r_offset);
1883 case bfd_reloc_undefined:
1884 (*info->callbacks->undefined_symbol)
1885 (info, reloc_data.symbol_name, input_bfd, input_section, rel->r_offset, TRUE);
1888 case bfd_reloc_other:
1889 /* xgettext:c-format */
1890 msg = _("%pB(%pA): warning: unaligned access to symbol '%s' in the small data area");
1893 case bfd_reloc_outofrange:
1894 /* xgettext:c-format */
1895 msg = _("%pB(%pA): internal error: out of range error");
1898 case bfd_reloc_notsupported:
1899 /* xgettext:c-format */
1900 msg = _("%pB(%pA): internal error: unsupported relocation error");
1903 case bfd_reloc_dangerous:
1904 /* xgettext:c-format */
1905 msg = _("%pB(%pA): internal error: dangerous relocation");
1909 /* xgettext:c-format */
1910 msg = _("%pB(%pA): internal error: unknown error");
1915 _bfd_error_handler (msg, input_bfd, input_section, reloc_data.symbol_name);
1922 #define elf_arc_hash_table(p) \
1923 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
1924 == ARC_ELF_DATA ? ((struct elf_arc_link_hash_table *) ((p)->hash)) : NULL)
1927 elf_arc_check_relocs (bfd * abfd,
1928 struct bfd_link_info * info,
1930 const Elf_Internal_Rela * relocs)
1932 Elf_Internal_Shdr * symtab_hdr;
1933 struct elf_link_hash_entry ** sym_hashes;
1934 const Elf_Internal_Rela * rel;
1935 const Elf_Internal_Rela * rel_end;
1937 asection * sreloc = NULL;
1938 struct elf_link_hash_table * htab = elf_hash_table (info);
1940 if (bfd_link_relocatable (info))
1943 if (htab->dynobj == NULL)
1944 htab->dynobj = abfd;
1946 dynobj = (elf_hash_table (info))->dynobj;
1947 symtab_hdr = &((elf_tdata (abfd))->symtab_hdr);
1948 sym_hashes = elf_sym_hashes (abfd);
1950 rel_end = relocs + sec->reloc_count;
1951 for (rel = relocs; rel < rel_end; rel++)
1953 enum elf_arc_reloc_type r_type;
1954 reloc_howto_type *howto;
1955 unsigned long r_symndx;
1956 struct elf_link_hash_entry *h;
1958 r_type = ELF32_R_TYPE (rel->r_info);
1960 if (r_type >= (int) R_ARC_max)
1962 bfd_set_error (bfd_error_bad_value);
1965 howto = arc_elf_howto (r_type);
1967 /* Load symbol information. */
1968 r_symndx = ELF32_R_SYM (rel->r_info);
1969 if (r_symndx < symtab_hdr->sh_info) /* Is a local symbol. */
1971 else /* Global one. */
1973 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1974 while (h->root.type == bfd_link_hash_indirect
1975 || h->root.type == bfd_link_hash_warning)
1976 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1984 /* During shared library creation, these relocs should not
1985 appear in a shared library (as memory will be read only
1986 and the dynamic linker can not resolve these. However
1987 the error should not occur for e.g. debugging or
1988 non-readonly sections. */
1990 && (bfd_link_dll (info) && !bfd_link_pie (info))
1991 && (sec->flags & SEC_ALLOC) != 0
1992 && (sec->flags & SEC_READONLY) != 0
1993 && ((sec->flags & SEC_CODE) != 0
1994 || (sec->flags & SEC_DEBUGGING) != 0))
1998 name = h->root.root.string;
2002 /* xgettext:c-format */
2003 (_("%pB: relocation %s against `%s' can not be used"
2004 " when making a shared object; recompile with -fPIC"),
2006 arc_elf_howto (r_type)->name,
2008 bfd_set_error (bfd_error_bad_value);
2012 /* In some cases we are not setting the 'non_got_ref'
2013 flag, even though the relocations don't require a GOT
2014 access. We should extend the testing in this area to
2015 ensure that no significant cases are being missed. */
2020 case R_ARC_32_PCREL:
2021 if ((bfd_link_pic (info))
2022 && ((r_type != R_ARC_PC32 && r_type != R_ARC_32_PCREL)
2024 && (!info->symbolic || !h->def_regular))))
2029 && ! htab->dynamic_sections_created
2030 && ! _bfd_elf_link_create_dynamic_sections (abfd, info))
2032 sreloc = _bfd_elf_make_dynamic_reloc_section (sec, dynobj,
2040 sreloc->size += sizeof (Elf32_External_Rela);
2047 if (is_reloc_for_PLT (howto))
2052 if (h->forced_local == 0)
2056 /* Add info to the symbol got_entry_list. */
2057 if (is_reloc_for_GOT (howto)
2058 || is_reloc_for_TLS (howto))
2060 if (bfd_link_dll (info) && !bfd_link_pie (info)
2061 && (r_type == R_ARC_TLS_LE_32 || r_type == R_ARC_TLS_LE_S9))
2065 name = h->root.root.string;
2067 /* bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); */
2070 /* xgettext:c-format */
2071 (_("%pB: relocation %s against `%s' can not be used"
2072 " when making a shared object; recompile with -fPIC"),
2074 arc_elf_howto (r_type)->name,
2076 bfd_set_error (bfd_error_bad_value);
2079 if (! _bfd_elf_create_got_section (dynobj, info))
2082 arc_fill_got_info_for_reloc (
2083 arc_got_entry_type_for_reloc (howto),
2084 get_got_entry_list_for_symbol (abfd, r_symndx, h),
2093 #define ELF_DYNAMIC_INTERPRETER "/sbin/ld-uClibc.so"
2095 static struct plt_version_t *
2096 arc_get_plt_version (struct bfd_link_info *info)
2100 for (i = 0; i < 1; i++)
2102 ARC_DEBUG ("%d: size1 = %d, size2 = %d\n", i,
2103 (int) plt_versions[i].entry_size,
2104 (int) plt_versions[i].elem_size);
2107 if (bfd_get_mach (info->output_bfd) == bfd_mach_arc_arcv2)
2109 if (bfd_link_pic (info))
2110 return &(plt_versions[ELF_ARCV2_PIC]);
2112 return &(plt_versions[ELF_ARCV2_ABS]);
2116 if (bfd_link_pic (info))
2117 return &(plt_versions[ELF_ARC_PIC]);
2119 return &(plt_versions[ELF_ARC_ABS]);
2124 add_symbol_to_plt (struct bfd_link_info *info)
2126 struct elf_link_hash_table *htab = elf_hash_table (info);
2129 struct plt_version_t *plt_data = arc_get_plt_version (info);
2131 /* If this is the first .plt entry, make room for the special first
2133 if (htab->splt->size == 0)
2134 htab->splt->size += plt_data->entry_size;
2136 ret = htab->splt->size;
2138 htab->splt->size += plt_data->elem_size;
2139 ARC_DEBUG ("PLT_SIZE = %d\n", (int) htab->splt->size);
2141 htab->sgotplt->size += 4;
2142 htab->srelplt->size += sizeof (Elf32_External_Rela);
2147 #define PLT_DO_RELOCS_FOR_ENTRY(ABFD, DS, RELOCS) \
2148 plt_do_relocs_for_symbol (ABFD, DS, RELOCS, 0, 0)
2151 plt_do_relocs_for_symbol (bfd *abfd,
2152 struct elf_link_hash_table *htab,
2153 const struct plt_reloc *reloc,
2155 bfd_vma symbol_got_offset)
2157 while (SYM_ONLY (reloc->symbol) != LAST_RELOC)
2159 bfd_vma relocation = 0;
2161 switch (SYM_ONLY (reloc->symbol))
2165 = htab->sgotplt->output_section->vma
2166 + htab->sgotplt->output_offset + symbol_got_offset;
2169 relocation += reloc->addend;
2171 if (IS_RELATIVE (reloc->symbol))
2173 bfd_vma reloc_offset = reloc->offset;
2174 reloc_offset -= (IS_INSN_32 (reloc->symbol)) ? 4 : 0;
2175 reloc_offset -= (IS_INSN_24 (reloc->symbol)) ? 2 : 0;
2177 relocation -= htab->splt->output_section->vma
2178 + htab->splt->output_offset
2179 + plt_offset + reloc_offset;
2182 /* TODO: being ME is not a property of the relocation but of the
2183 section of which is applying the relocation. */
2184 if (IS_MIDDLE_ENDIAN (reloc->symbol) && !bfd_big_endian (abfd))
2187 = ((relocation & 0xffff0000) >> 16)
2188 | ((relocation & 0xffff) << 16);
2191 switch (reloc->size)
2194 bfd_put_32 (htab->splt->output_section->owner,
2196 htab->splt->contents + plt_offset + reloc->offset);
2200 reloc = &(reloc[1]); /* Jump to next relocation. */
2205 relocate_plt_for_symbol (bfd *output_bfd,
2206 struct bfd_link_info *info,
2207 struct elf_link_hash_entry *h)
2209 struct plt_version_t *plt_data = arc_get_plt_version (info);
2210 struct elf_link_hash_table *htab = elf_hash_table (info);
2212 bfd_vma plt_index = (h->plt.offset - plt_data->entry_size)
2213 / plt_data->elem_size;
2214 bfd_vma got_offset = (plt_index + 3) * 4;
2216 ARC_DEBUG ("arc_info: PLT_OFFSET = %#lx, PLT_ENTRY_VMA = %#lx, \
2217 GOT_ENTRY_OFFSET = %#lx, GOT_ENTRY_VMA = %#lx, for symbol %s\n",
2218 (long) h->plt.offset,
2219 (long) (htab->splt->output_section->vma
2220 + htab->splt->output_offset
2223 (long) (htab->sgotplt->output_section->vma
2224 + htab->sgotplt->output_offset
2226 h->root.root.string);
2230 uint16_t *ptr = (uint16_t *) plt_data->elem;
2232 for (i = 0; i < plt_data->elem_size/2; i++)
2234 uint16_t data = ptr[i];
2235 bfd_put_16 (output_bfd,
2237 htab->splt->contents + h->plt.offset + (i*2));
2241 plt_do_relocs_for_symbol (output_bfd, htab,
2242 plt_data->elem_relocs,
2246 /* Fill in the entry in the global offset table. */
2247 bfd_put_32 (output_bfd,
2248 (bfd_vma) (htab->splt->output_section->vma
2249 + htab->splt->output_offset),
2250 htab->sgotplt->contents + got_offset);
2252 /* TODO: Fill in the entry in the .rela.plt section. */
2254 Elf_Internal_Rela rel;
2257 rel.r_offset = (htab->sgotplt->output_section->vma
2258 + htab->sgotplt->output_offset
2262 BFD_ASSERT (h->dynindx != -1);
2263 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARC_JMP_SLOT);
2265 loc = htab->srelplt->contents;
2266 loc += plt_index * sizeof (Elf32_External_Rela); /* relA */
2267 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc);
2272 relocate_plt_for_entry (bfd *abfd,
2273 struct bfd_link_info *info)
2275 struct plt_version_t *plt_data = arc_get_plt_version (info);
2276 struct elf_link_hash_table *htab = elf_hash_table (info);
2280 uint16_t *ptr = (uint16_t *) plt_data->entry;
2281 for (i = 0; i < plt_data->entry_size/2; i++)
2283 uint16_t data = ptr[i];
2286 htab->splt->contents + (i*2));
2289 PLT_DO_RELOCS_FOR_ENTRY (abfd, htab, plt_data->entry_relocs);
2292 /* Desc : Adjust a symbol defined by a dynamic object and referenced
2293 by a regular object. The current definition is in some section of
2294 the dynamic object, but we're not including those sections. We
2295 have to change the definition to something the rest of the link can
2299 elf_arc_adjust_dynamic_symbol (struct bfd_link_info *info,
2300 struct elf_link_hash_entry *h)
2303 bfd *dynobj = (elf_hash_table (info))->dynobj;
2304 struct elf_link_hash_table *htab = elf_hash_table (info);
2306 if (h->type == STT_FUNC
2307 || h->type == STT_GNU_IFUNC
2308 || h->needs_plt == 1)
2310 if (!bfd_link_pic (info) && !h->def_dynamic && !h->ref_dynamic)
2312 /* This case can occur if we saw a PLT32 reloc in an input
2313 file, but the symbol was never referred to by a dynamic
2314 object. In such a case, we don't actually need to build
2315 a procedure linkage table, and we can just do a PC32
2317 BFD_ASSERT (h->needs_plt);
2321 /* Make sure this symbol is output as a dynamic symbol. */
2322 if (h->dynindx == -1 && !h->forced_local
2323 && !bfd_elf_link_record_dynamic_symbol (info, h))
2326 if (bfd_link_pic (info)
2327 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2329 bfd_vma loc = add_symbol_to_plt (info);
2331 if (bfd_link_executable (info) && !h->def_regular)
2333 h->root.u.def.section = htab->splt;
2334 h->root.u.def.value = loc;
2336 h->plt.offset = loc;
2340 h->plt.offset = (bfd_vma) -1;
2346 /* If this is a weak symbol, and there is a real definition, the
2347 processor independent code will have arranged for us to see the
2348 real definition first, and we can just use the same value. */
2349 if (h->is_weakalias)
2351 struct elf_link_hash_entry *def = weakdef (h);
2352 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
2353 h->root.u.def.section = def->root.u.def.section;
2354 h->root.u.def.value = def->root.u.def.value;
2358 /* This is a reference to a symbol defined by a dynamic object which
2359 is not a function. */
2361 /* If we are creating a shared library, we must presume that the
2362 only references to the symbol are via the global offset table.
2363 For such cases we need not do anything here; the relocations will
2364 be handled correctly by relocate_section. */
2365 if (!bfd_link_executable (info))
2368 /* If there are no non-GOT references, we do not need a copy
2370 if (!h->non_got_ref)
2373 /* If -z nocopyreloc was given, we won't generate them either. */
2374 if (info->nocopyreloc)
2380 /* We must allocate the symbol in our .dynbss section, which will
2381 become part of the .bss section of the executable. There will be
2382 an entry for this symbol in the .dynsym section. The dynamic
2383 object will contain position independent code, so all references
2384 from the dynamic object to this symbol will go through the global
2385 offset table. The dynamic linker will use the .dynsym entry to
2386 determine the address it must put in the global offset table, so
2387 both the dynamic object and the regular object will refer to the
2388 same memory location for the variable. */
2393 /* We must generate a R_ARC_COPY reloc to tell the dynamic linker to
2394 copy the initial value out of the dynamic object and into the
2395 runtime process image. We need to remember the offset into the
2396 .rela.bss section we are going to use. */
2397 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
2399 struct elf_arc_link_hash_table *arc_htab = elf_arc_hash_table (info);
2401 BFD_ASSERT (arc_htab->elf.srelbss != NULL);
2402 arc_htab->elf.srelbss->size += sizeof (Elf32_External_Rela);
2406 /* TODO: Move this also to arc_hash_table. */
2407 s = bfd_get_section_by_name (dynobj, ".dynbss");
2408 BFD_ASSERT (s != NULL);
2410 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2413 /* Function : elf_arc_finish_dynamic_symbol
2414 Brief : Finish up dynamic symbol handling. We set the
2415 contents of various dynamic sections here.
2420 Returns : True/False as the return status. */
2423 elf_arc_finish_dynamic_symbol (bfd * output_bfd,
2424 struct bfd_link_info *info,
2425 struct elf_link_hash_entry *h,
2426 Elf_Internal_Sym * sym)
2428 if (h->plt.offset != (bfd_vma) -1)
2430 relocate_plt_for_symbol (output_bfd, info, h);
2432 if (!h->def_regular)
2434 /* Mark the symbol as undefined, rather than as defined in
2435 the .plt section. Leave the value alone. */
2436 sym->st_shndx = SHN_UNDEF;
2441 /* This function traverses list of GOT entries and
2442 create respective dynamic relocs. */
2443 /* TODO: Make function to get list and not access the list directly. */
2444 /* TODO: Move function to relocate_section create this relocs eagerly. */
2445 struct elf_arc_link_hash_entry *ah =
2446 (struct elf_arc_link_hash_entry *) h;
2447 create_got_dynrelocs_for_got_info (&ah->got_ents,
2454 struct elf_arc_link_hash_table *arc_htab = elf_arc_hash_table (info);
2456 if (arc_htab == NULL)
2459 if (h->dynindx == -1
2460 || (h->root.type != bfd_link_hash_defined
2461 && h->root.type != bfd_link_hash_defweak)
2462 || arc_htab->elf.srelbss == NULL)
2465 bfd_vma rel_offset = (h->root.u.def.value
2466 + h->root.u.def.section->output_section->vma
2467 + h->root.u.def.section->output_offset);
2469 bfd_byte * loc = arc_htab->elf.srelbss->contents
2470 + (arc_htab->elf.srelbss->reloc_count * sizeof (Elf32_External_Rela));
2471 arc_htab->elf.srelbss->reloc_count++;
2473 Elf_Internal_Rela rel;
2475 rel.r_offset = rel_offset;
2477 BFD_ASSERT (h->dynindx != -1);
2478 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARC_COPY);
2480 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc);
2483 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2484 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2485 || strcmp (h->root.root.string, "__DYNAMIC") == 0
2486 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2487 sym->st_shndx = SHN_ABS;
2492 #define GET_SYMBOL_OR_SECTION(TAG, SYMBOL, SECTION) \
2494 if (SYMBOL != NULL) \
2495 h = elf_link_hash_lookup (elf_hash_table (info), \
2496 SYMBOL, FALSE, FALSE, TRUE); \
2497 else if (SECTION != NULL) \
2498 s = bfd_get_linker_section (dynobj, SECTION); \
2502 struct obfd_info_group {
2504 struct bfd_link_info *info;
2508 arc_create_forced_local_got_entries_for_tls (struct bfd_hash_entry *bh,
2511 struct elf_arc_link_hash_entry * h =
2512 (struct elf_arc_link_hash_entry *) bh;
2513 struct obfd_info_group *tmp = (struct obfd_info_group *) data;
2515 if (h->got_ents != NULL)
2519 struct got_entry *list = h->got_ents;
2521 while (list != NULL)
2523 create_got_dynrelocs_for_single_entry (list, tmp->output_bfd,
2525 (struct elf_link_hash_entry *) h);
2534 /* Function : elf_arc_finish_dynamic_sections
2535 Brief : Finish up the dynamic sections handling.
2540 Returns : True/False as the return status. */
2543 elf_arc_finish_dynamic_sections (bfd * output_bfd,
2544 struct bfd_link_info *info)
2546 struct elf_link_hash_table *htab = elf_hash_table (info);
2547 bfd *dynobj = (elf_hash_table (info))->dynobj;
2548 asection *sdyn = bfd_get_linker_section (dynobj, ".dynamic");
2552 Elf32_External_Dyn *dyncon, *dynconend;
2554 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2556 = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
2557 for (; dyncon < dynconend; dyncon++)
2559 Elf_Internal_Dyn internal_dyn;
2560 bfd_boolean do_it = FALSE;
2562 struct elf_link_hash_entry *h = NULL;
2565 bfd_elf32_swap_dyn_in (dynobj, dyncon, &internal_dyn);
2567 switch (internal_dyn.d_tag)
2569 GET_SYMBOL_OR_SECTION (DT_INIT, info->init_function, NULL)
2570 GET_SYMBOL_OR_SECTION (DT_FINI, info->fini_function, NULL)
2571 GET_SYMBOL_OR_SECTION (DT_PLTGOT, NULL, ".plt")
2572 GET_SYMBOL_OR_SECTION (DT_JMPREL, NULL, ".rela.plt")
2573 GET_SYMBOL_OR_SECTION (DT_PLTRELSZ, NULL, ".rela.plt")
2574 GET_SYMBOL_OR_SECTION (DT_VERSYM, NULL, ".gnu.version")
2575 GET_SYMBOL_OR_SECTION (DT_VERDEF, NULL, ".gnu.version_d")
2576 GET_SYMBOL_OR_SECTION (DT_VERNEED, NULL, ".gnu.version_r")
2581 /* In case the dynamic symbols should be updated with a symbol. */
2583 && (h->root.type == bfd_link_hash_defined
2584 || h->root.type == bfd_link_hash_defweak))
2588 internal_dyn.d_un.d_val = h->root.u.def.value;
2589 asec_ptr = h->root.u.def.section;
2590 if (asec_ptr->output_section != NULL)
2592 internal_dyn.d_un.d_val +=
2593 (asec_ptr->output_section->vma
2594 + asec_ptr->output_offset);
2598 /* The symbol is imported from another shared
2599 library and does not apply to this one. */
2600 internal_dyn.d_un.d_val = 0;
2604 else if (s != NULL) /* With a section information. */
2606 switch (internal_dyn.d_tag)
2613 internal_dyn.d_un.d_ptr = (s->output_section->vma
2614 + s->output_offset);
2619 internal_dyn.d_un.d_val = s->size;
2629 bfd_elf32_swap_dyn_out (output_bfd, &internal_dyn, dyncon);
2632 if (htab->splt->size > 0)
2634 relocate_plt_for_entry (output_bfd, info);
2637 /* TODO: Validate this. */
2638 if (htab->srelplt->output_section != bfd_abs_section_ptr)
2639 elf_section_data (htab->srelplt->output_section)
2640 ->this_hdr.sh_entsize = 12;
2643 /* Fill in the first three entries in the global offset table. */
2646 struct elf_link_hash_entry *h;
2647 h = elf_link_hash_lookup (elf_hash_table (info), "_GLOBAL_OFFSET_TABLE_",
2648 FALSE, FALSE, TRUE);
2650 if (h != NULL && h->root.type != bfd_link_hash_undefined
2651 && h->root.u.def.section != NULL)
2653 asection *sec = h->root.u.def.section;
2656 bfd_put_32 (output_bfd, (bfd_vma) 0,
2659 bfd_put_32 (output_bfd,
2660 sdyn->output_section->vma + sdyn->output_offset,
2662 bfd_put_32 (output_bfd, (bfd_vma) 0, sec->contents + 4);
2663 bfd_put_32 (output_bfd, (bfd_vma) 0, sec->contents + 8);
2667 struct obfd_info_group group;
2668 group.output_bfd = output_bfd;
2670 bfd_hash_traverse (&info->hash->table,
2671 arc_create_forced_local_got_entries_for_tls, &group);
2676 #define ADD_DYNAMIC_SYMBOL(NAME, TAG) \
2677 h = elf_link_hash_lookup (elf_hash_table (info), \
2678 NAME, FALSE, FALSE, FALSE); \
2679 if ((h != NULL && (h->ref_regular || h->def_regular))) \
2680 if (! _bfd_elf_add_dynamic_entry (info, TAG, 0)) \
2683 /* Set the sizes of the dynamic sections. */
2685 elf_arc_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2686 struct bfd_link_info *info)
2690 bfd_boolean relocs_exist = FALSE;
2691 bfd_boolean reltext_exist = FALSE;
2692 struct elf_link_hash_table *htab = elf_hash_table (info);
2694 dynobj = htab->dynobj;
2695 BFD_ASSERT (dynobj != NULL);
2697 if (htab->dynamic_sections_created)
2699 struct elf_link_hash_entry *h;
2701 /* Set the contents of the .interp section to the
2703 if (bfd_link_executable (info) && !info->nointerp)
2705 s = bfd_get_section_by_name (dynobj, ".interp");
2706 BFD_ASSERT (s != NULL);
2707 s->size = sizeof (ELF_DYNAMIC_INTERPRETER);
2708 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2711 /* Add some entries to the .dynamic section. We fill in some of
2712 the values later, in elf_bfd_final_link, but we must add the
2713 entries now so that we know the final size of the .dynamic
2714 section. Checking if the .init section is present. We also
2715 create DT_INIT and DT_FINI entries if the init_str has been
2716 changed by the user. */
2717 ADD_DYNAMIC_SYMBOL (info->init_function, DT_INIT);
2718 ADD_DYNAMIC_SYMBOL (info->fini_function, DT_FINI);
2722 /* We may have created entries in the .rela.got section.
2723 However, if we are not creating the dynamic sections, we will
2724 not actually use these entries. Reset the size of .rela.got,
2725 which will cause it to get stripped from the output file
2727 if (htab->srelgot != NULL)
2728 htab->srelgot->size = 0;
2731 for (s = dynobj->sections; s != NULL; s = s->next)
2733 if ((s->flags & SEC_LINKER_CREATED) == 0)
2738 || s == htab->sgotplt
2739 || s == htab->sdynbss)
2741 /* Strip this section if we don't need it. */
2743 else if (strncmp (s->name, ".rela", 5) == 0)
2745 if (s->size != 0 && s != htab->srelplt)
2749 const char *name = s->name + 5;
2751 for (ibfd = info->input_bfds; ibfd; ibfd = ibfd->link.next)
2752 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
2753 && ibfd->flags & DYNAMIC)
2755 asection *target = bfd_get_section_by_name (ibfd, name);
2757 && elf_section_data (target)->sreloc == s
2758 && ((target->output_section->flags
2759 & (SEC_READONLY | SEC_ALLOC))
2760 == (SEC_READONLY | SEC_ALLOC)))
2762 reltext_exist = TRUE;
2767 relocs_exist = TRUE;
2770 /* We use the reloc_count field as a counter if we need to
2771 copy relocs into the output file. */
2776 /* It's not one of our sections, so don't allocate space. */
2782 s->flags |= SEC_EXCLUDE;
2786 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2789 /* Allocate memory for the section contents. */
2790 s->contents = bfd_zalloc (dynobj, s->size);
2791 if (s->contents == NULL)
2795 if (htab->dynamic_sections_created)
2797 /* TODO: Check if this is needed. */
2798 if (!bfd_link_pic (info))
2799 if (!_bfd_elf_add_dynamic_entry (info, DT_DEBUG, 0))
2802 if (htab->splt && (htab->splt->flags & SEC_EXCLUDE) == 0)
2803 if (!_bfd_elf_add_dynamic_entry (info, DT_PLTGOT, 0)
2804 || !_bfd_elf_add_dynamic_entry (info, DT_PLTRELSZ, 0)
2805 || !_bfd_elf_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
2806 || !_bfd_elf_add_dynamic_entry (info, DT_JMPREL, 0))
2810 if (!_bfd_elf_add_dynamic_entry (info, DT_RELA, 0)
2811 || !_bfd_elf_add_dynamic_entry (info, DT_RELASZ, 0)
2812 || !_bfd_elf_add_dynamic_entry (info, DT_RELAENT,
2813 sizeof (Elf32_External_Rela)))
2817 if (!_bfd_elf_add_dynamic_entry (info, DT_TEXTREL, 0))
2825 /* Classify dynamic relocs such that -z combreloc can reorder and combine
2827 static enum elf_reloc_type_class
2828 elf32_arc_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
2829 const asection *rel_sec ATTRIBUTE_UNUSED,
2830 const Elf_Internal_Rela *rela)
2832 switch ((int) ELF32_R_TYPE (rela->r_info))
2834 case R_ARC_RELATIVE:
2835 return reloc_class_relative;
2836 case R_ARC_JMP_SLOT:
2837 return reloc_class_plt;
2839 return reloc_class_copy;
2840 /* TODO: Needed in future to support ifunc. */
2842 case R_ARC_IRELATIVE:
2843 return reloc_class_ifunc;
2846 return reloc_class_normal;
2850 const struct elf_size_info arc_elf32_size_info =
2852 sizeof (Elf32_External_Ehdr),
2853 sizeof (Elf32_External_Phdr),
2854 sizeof (Elf32_External_Shdr),
2855 sizeof (Elf32_External_Rel),
2856 sizeof (Elf32_External_Rela),
2857 sizeof (Elf32_External_Sym),
2858 sizeof (Elf32_External_Dyn),
2859 sizeof (Elf_External_Note),
2863 ELFCLASS32, EV_CURRENT,
2864 bfd_elf32_write_out_phdrs,
2865 bfd_elf32_write_shdrs_and_ehdr,
2866 bfd_elf32_checksum_contents,
2867 bfd_elf32_write_relocs,
2868 bfd_elf32_swap_symbol_in,
2869 bfd_elf32_swap_symbol_out,
2870 bfd_elf32_slurp_reloc_table,
2871 bfd_elf32_slurp_symbol_table,
2872 bfd_elf32_swap_dyn_in,
2873 bfd_elf32_swap_dyn_out,
2874 bfd_elf32_swap_reloc_in,
2875 bfd_elf32_swap_reloc_out,
2876 bfd_elf32_swap_reloca_in,
2877 bfd_elf32_swap_reloca_out
2880 #define elf_backend_size_info arc_elf32_size_info
2882 /* GDB expects general purpose registers to be in section .reg. However Linux
2883 kernel doesn't create this section and instead writes registers to NOTE
2884 section. It is up to the binutils to create a pseudo-section .reg from the
2885 contents of NOTE. Also BFD will read pid and signal number from NOTE. This
2886 function relies on offsets inside elf_prstatus structure in Linux to be
2890 elf32_arc_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
2895 switch (note->descsz)
2900 case 236: /* sizeof (struct elf_prstatus) on Linux/arc. */
2902 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
2904 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
2907 size = (40 * 4); /* There are 40 registers in user_regs_struct. */
2910 /* Make a ".reg/999" section. */
2911 return _bfd_elfcore_make_pseudosection (abfd, ".reg", size,
2912 note->descpos + offset);
2915 /* Determine whether an object attribute tag takes an integer, a
2919 elf32_arc_obj_attrs_arg_type (int tag)
2921 if (tag == Tag_ARC_CPU_name
2922 || tag == Tag_ARC_ISA_config
2923 || tag == Tag_ARC_ISA_apex)
2924 return ATTR_TYPE_FLAG_STR_VAL;
2925 else if (tag < (Tag_ARC_ISA_mpy_option + 1))
2926 return ATTR_TYPE_FLAG_INT_VAL;
2928 return (tag & 1) != 0 ? ATTR_TYPE_FLAG_STR_VAL : ATTR_TYPE_FLAG_INT_VAL;
2931 /* Attribute numbers >=14 can be safely ignored. */
2934 elf32_arc_obj_attrs_handle_unknown (bfd *abfd, int tag)
2936 if ((tag & 127) < (Tag_ARC_ISA_mpy_option + 1))
2939 (_("%pB: unknown mandatory ARC object attribute %d"),
2941 bfd_set_error (bfd_error_bad_value);
2947 (_("warning: %pB: unknown ARC object attribute %d"),
2953 /* Handle an ARC specific section when reading an object file. This is
2954 called when bfd_section_from_shdr finds a section with an unknown
2958 elf32_arc_section_from_shdr (bfd *abfd,
2959 Elf_Internal_Shdr * hdr,
2963 switch (hdr->sh_type)
2965 case 0x0c: /* MWDT specific section, don't complain about it. */
2966 case SHT_ARC_ATTRIBUTES:
2973 if (!_bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
2979 #define TARGET_LITTLE_SYM arc_elf32_le_vec
2980 #define TARGET_LITTLE_NAME "elf32-littlearc"
2981 #define TARGET_BIG_SYM arc_elf32_be_vec
2982 #define TARGET_BIG_NAME "elf32-bigarc"
2983 #define ELF_ARCH bfd_arch_arc
2984 #define ELF_TARGET_ID ARC_ELF_DATA
2985 #define ELF_MACHINE_CODE EM_ARC_COMPACT
2986 #define ELF_MACHINE_ALT1 EM_ARC_COMPACT2
2987 #define ELF_MAXPAGESIZE 0x2000
2989 #define bfd_elf32_bfd_link_hash_table_create arc_elf_link_hash_table_create
2991 #define bfd_elf32_bfd_merge_private_bfd_data arc_elf_merge_private_bfd_data
2992 #define bfd_elf32_bfd_reloc_type_lookup arc_elf32_bfd_reloc_type_lookup
2993 #define bfd_elf32_bfd_set_private_flags arc_elf_set_private_flags
2994 #define bfd_elf32_bfd_print_private_bfd_data arc_elf_print_private_bfd_data
2995 #define bfd_elf32_bfd_copy_private_bfd_data arc_elf_copy_private_bfd_data
2997 #define elf_info_to_howto_rel arc_info_to_howto_rel
2998 #define elf_backend_object_p arc_elf_object_p
2999 #define elf_backend_final_write_processing arc_elf_final_write_processing
3001 #define elf_backend_relocate_section elf_arc_relocate_section
3002 #define elf_backend_check_relocs elf_arc_check_relocs
3003 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
3005 #define elf_backend_reloc_type_class elf32_arc_reloc_type_class
3007 #define elf_backend_adjust_dynamic_symbol elf_arc_adjust_dynamic_symbol
3008 #define elf_backend_finish_dynamic_symbol elf_arc_finish_dynamic_symbol
3010 #define elf_backend_finish_dynamic_sections elf_arc_finish_dynamic_sections
3011 #define elf_backend_size_dynamic_sections elf_arc_size_dynamic_sections
3013 #define elf_backend_can_gc_sections 1
3014 #define elf_backend_want_got_plt 1
3015 #define elf_backend_plt_readonly 1
3016 #define elf_backend_rela_plts_and_copies_p 1
3017 #define elf_backend_want_plt_sym 0
3018 #define elf_backend_got_header_size 12
3019 #define elf_backend_dtrel_excludes_plt 1
3021 #define elf_backend_may_use_rel_p 0
3022 #define elf_backend_may_use_rela_p 1
3023 #define elf_backend_default_use_rela_p 1
3025 #define elf_backend_grok_prstatus elf32_arc_grok_prstatus
3027 #define elf_backend_default_execstack 0
3029 #undef elf_backend_obj_attrs_vendor
3030 #define elf_backend_obj_attrs_vendor "ARC"
3031 #undef elf_backend_obj_attrs_section
3032 #define elf_backend_obj_attrs_section ".ARC.attributes"
3033 #undef elf_backend_obj_attrs_arg_type
3034 #define elf_backend_obj_attrs_arg_type elf32_arc_obj_attrs_arg_type
3035 #undef elf_backend_obj_attrs_section_type
3036 #define elf_backend_obj_attrs_section_type SHT_ARC_ATTRIBUTES
3037 #define elf_backend_obj_attrs_handle_unknown elf32_arc_obj_attrs_handle_unknown
3039 #define elf_backend_section_from_shdr elf32_arc_section_from_shdr
3041 #include "elf32-target.h"