| blob | 8abb09e2fd5777cfa7e0271330ecb63fd995617d |
1 /* CRIS-specific support for 32-bit ELF.
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
3 2010 Free Software Foundation, Inc.
4 Contributed by Axis Communications AB.
5 Written by Hans-Peter Nilsson, based on elf32-fr30.c
6 PIC and shlib bits based primarily on elf32-m68k.c and elf32-i386.c.
8 This file is part of BFD, the Binary File Descriptor library.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
23 MA 02110-1301, USA. */
30 #include <limits.h>
32 /* Forward declarations. */
36 static void cris_info_to_howto_rela
39 static bfd_reloc_status_type cris_elf_pcrel_reloc
42 static bfd_boolean cris_elf_grok_prstatus
45 static bfd_boolean cris_elf_grok_psinfo
48 static bfd_boolean cris_elf_relocate_section
52 static bfd_reloc_status_type cris_final_link_relocate
60 static bfd_boolean cris_elf_set_mach_from_flags
69 static bfd_boolean elf_cris_discard_excess_dso_dynamics
71 static bfd_boolean elf_cris_discard_excess_program_dynamics
73 static bfd_boolean elf_cris_adjust_gotplt_to_got
75 static bfd_boolean elf_cris_try_fold_plt_to_got
81 static bfd_boolean elf_cris_adjust_dynamic_symbol
83 static bfd_boolean cris_elf_check_relocs
87 static bfd_boolean elf_cris_size_dynamic_sections
89 static bfd_boolean elf_cris_finish_dynamic_symbol
91 Elf_Internal_Sym *));
92 static bfd_boolean elf_cris_finish_dynamic_sections
94 static void elf_cris_hide_symbol
96 static enum elf_reloc_type_class elf_cris_reloc_type_class
100 {
101 /* This reloc does nothing. */
116 /* An 8 bit absolute relocation. */
131 /* A 16 bit absolute relocation. */
146 /* A 32 bit absolute relocation. */
153 /* We don't want overflow complaints for 64-bit vma builds
154 for e.g. sym+0x40000000 (or actually sym-0xc0000000 in
155 32-bit ELF) where sym=0xc0001234.
156 Don't do this for the PIC relocs, as we don't expect to
157 see them with large offsets. */
166 /* An 8 bit PC-relative relocation. */
181 /* A 16 bit PC-relative relocation. */
196 /* A 32 bit PC-relative relocation. */
211 /* GNU extension to record C++ vtable hierarchy. */
226 /* GNU extension to record C++ vtable member usage. */
241 /* This is used only by the dynamic linker. The symbol should exist
242 both in the object being run and in some shared library. The
243 dynamic linker copies the data addressed by the symbol from the
244 shared library into the object, because the object being
245 run has to have the data at some particular address. */
260 /* Like R_CRIS_32, but used when setting global offset table entries. */
275 /* Marks a procedure linkage table entry for a symbol. */
290 /* Used only by the dynamic linker. When the object is run, this
291 longword is set to the load address of the object, plus the
292 addend. */
307 /* Like R_CRIS_32, but referring to the GOT table entry for the symbol. */
336 /* Like R_CRIS_32_GOT, but referring to (and requesting a) PLT part of
337 the GOT table for the symbol. */
366 /* A 32-bit offset from GOT to (local const) symbol: no GOT entry should
367 be necessary. */
382 /* A 32-bit offset from GOT to entry for this symbol in PLT and request
383 to create PLT entry for symbol. */
398 /* A 32-bit offset from PC (location after the relocation) + addend to
399 entry for this symbol in PLT and request to create PLT entry for
400 symbol. */
415 /* We don't handle these in any special manner and cross-format
416 linking is not supported; just recognize them enough to pass them
417 around. FIXME: do the same for most PIC relocs and add sanity
418 tests to actually refuse gracefully to handle these and PIC
419 relocs for cross-format linking. */
420 #define TLSHOWTO32(name) \
421 HOWTO (name, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, \
422 bfd_elf_generic_reloc, #name, FALSE, 0, 0xffffffff, FALSE)
423 #define TLSHOWTO16X(name, X) \
424 HOWTO (name, 0, 1, 16, FALSE, 0, complain_overflow_ ## X, \
425 bfd_elf_generic_reloc, #name, FALSE, 0, 0xffff, FALSE)
426 #define TLSHOWTO16(name) TLSHOWTO16X(name, unsigned)
427 #define TLSHOWTO16S(name) TLSHOWTO16X(name, signed)
441 };
442 \f
443 /* Map BFD reloc types to CRIS ELF reloc types. */
445 struct cris_reloc_map
446 {
447 bfd_reloc_code_real_type bfd_reloc_val;
449 };
452 {
485 };
490 bfd_reloc_code_real_type code;
491 {
499 }
503 {
508 i++)
514 }
516 /* Set the howto pointer for an CRIS ELF reloc. */
518 static void
523 {
529 }
531 bfd_reloc_status_type
537 PTR data ATTRIBUTE_UNUSED;
541 {
542 /* By default (using only bfd_elf_generic_reloc when linking to
543 non-ELF formats) PC-relative relocs are relative to the beginning
544 of the reloc. CRIS PC-relative relocs are relative to the position
545 *after* the reloc because that's what pre-CRISv32 PC points to
546 after reading an insn field with that reloc. (For CRISv32, PC is
547 actually relative to the start of the insn, but we keep the old
548 definition.) Still, we use as much generic machinery as we can.
550 Only adjust when doing a final link. */
554 return
557 }
558 \f
559 /* Support for core dump NOTE sections.
560 The slightly unintuitive code layout is an attempt to keep at least
561 some similarities with other ports, hoping to simplify general
562 changes, while still keeping Linux/CRIS and Linux/CRISv32 code apart. */
564 static bfd_boolean
568 {
574 {
579 /* pr_cursig */
582 /* pr_pid */
585 /* pr_reg */
590 }
591 else
593 {
598 /* pr_cursig */
601 /* pr_pid */
604 /* pr_reg */
609 }
611 /* Make a ".reg/999" section. */
614 }
616 static bfd_boolean
620 {
623 {
632 }
633 else
635 {
644 }
646 /* Note that for some reason, a spurious space is tacked
647 onto the end of the args in some (at least one anyway)
648 implementations, so strip it off if it exists. */
650 {
656 }
659 }
660 \f
661 /* The name of the dynamic interpreter. This is put in the .interp
662 section. */
666 /* The size in bytes of an entry in the procedure linkage table. */
668 #define PLT_ENTRY_SIZE 20
669 #define PLT_ENTRY_SIZE_V32 26
671 /* The first entry in an absolute procedure linkage table looks like this. */
674 {
683 };
686 {
697 };
699 /* Subsequent entries in an absolute procedure linkage table look like
700 this. */
703 {
712 };
715 {
726 };
728 /* The first entry in a PIC procedure linkage table looks like this. */
731 {
736 };
739 {
751 };
753 /* Subsequent entries in a PIC procedure linkage table look like this. */
756 {
765 };
768 {
779 };
780 \f
781 /* We copy elf32-m68k.c and elf32-i386.c for the basic linker hash bits
782 (and most other PIC/shlib stuff). Check that we don't drift away
783 without reason.
785 The CRIS linker, like the m68k and i386 linkers (and probably the rest
786 too) needs to keep track of the number of relocs that it decides to
787 copy in check_relocs for each symbol. This is so that it can discard
788 PC relative relocs if it doesn't need them when linking with
789 -Bsymbolic. We store the information in a field extending the regular
790 ELF linker hash table. */
792 /* This structure keeps track of the number of PC relative relocs we have
793 copied for a given symbol. */
795 struct elf_cris_pcrel_relocs_copied
796 {
797 /* Next section. */
800 /* A section in dynobj. */
803 /* Number of relocs copied in this section. */
804 bfd_size_type count;
806 /* Example of reloc being copied, for message. */
808 };
810 /* CRIS ELF linker hash entry. */
812 struct elf_cris_link_hash_entry
813 {
816 /* Number of PC relative relocs copied for this symbol. */
819 /* The GOTPLT references are CRIS-specific; the goal is to avoid having
820 both a general GOT and a PLT-specific GOT entry for the same symbol,
821 when it is referenced both as a function and as a function pointer.
823 Number of GOTPLT references for a function. */
824 bfd_signed_vma gotplt_refcount;
826 /* Actual GOTPLT index for this symbol, if applicable, or zero if not
827 (zero is never used as an index). FIXME: We should be able to fold
828 this with gotplt_refcount in a union, like the got and plt unions in
829 elf_link_hash_entry. */
830 bfd_size_type gotplt_offset;
832 /* The root.got.refcount is the sum of the regular reference counts
833 (this) and those members below. We have to keep a separate count
834 to track when we've found the first (or last) reference to a
835 regular got entry. The offset is in root.got.offset. */
836 bfd_signed_vma reg_got_refcount;
838 /* Similar to the above, the number of reloc references to this
839 symbols that need a R_CRIS_32_TPREL slot. The offset is in
840 root.got.offset, because this and .dtp_refcount can't validly
841 happen when there's also a regular GOT entry; that's invalid
842 input for which an error is emitted. */
843 bfd_signed_vma tprel_refcount;
845 /* Similar to the above, the number of reloc references to this
846 symbols that need a R_CRIS_DTP slot. The offset is in
847 root.got.offset; plus 4 if .tprel_refcount > 0. */
848 bfd_signed_vma dtp_refcount;
849 };
851 /* The local_got_refcounts and local_got_offsets are a multiple of
852 LSNUM in size, namely LGOT_ALLOC_NELTS_FOR(LSNUM) (plus one for the
853 refcount for GOT itself, see code), with the summary / group offset
854 for local symbols located at offset N, reference counts for
855 ordinary (address) relocs at offset N + LSNUM, for R_CRIS_DTP
856 relocs at offset N + 2*LSNUM, and for R_CRIS_32_TPREL relocs at N +
857 3*LSNUM. */
859 #define LGOT_REG_NDX(x) ((x) + symtab_hdr->sh_info)
860 #define LGOT_DTP_NDX(x) ((x) + 2 * symtab_hdr->sh_info)
861 #define LGOT_TPREL_NDX(x) ((x) + 3 * symtab_hdr->sh_info)
862 #define LGOT_ALLOC_NELTS_FOR(x) ((x) * 4)
864 /* CRIS ELF linker hash table. */
866 struct elf_cris_link_hash_table
867 {
870 /* We can't use the PLT offset and calculate to get the GOTPLT offset,
871 since we try and avoid creating GOTPLT:s when there's already a GOT.
872 Instead, we keep and update the next available index here. */
873 bfd_size_type next_gotplt_entry;
875 /* The number of R_CRIS_32_DTPREL and R_CRIS_16_DTPREL that have
876 been seen for any input; if != 0, then the constant-offset
877 R_CRIS_DTPMOD is needed for this DSO/executable. This turns
878 negative at relocation, so that we don't need an extra flag for
879 when the reloc is output. */
880 bfd_signed_vma dtpmod_refcount;
881 };
883 /* Traverse a CRIS ELF linker hash table. */
885 #define elf_cris_link_hash_traverse(table, func, info) \
886 (elf_link_hash_traverse \
887 (&(table)->root, \
888 (bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \
889 (info)))
891 /* Get the CRIS ELF linker hash table from a link_info structure. */
893 #define elf_cris_hash_table(p) \
894 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
895 == CRIS_ELF_DATA ? ((struct elf_cris_link_hash_table *) ((p)->hash)) : NULL)
897 /* Get the CRIS ELF linker hash entry from a regular hash entry (the
898 "parent class"). The .root reference is just a simple type
899 check on the argument. */
901 #define elf_cris_hash_entry(p) \
902 ((struct elf_cris_link_hash_entry *) (&(p)->root))
904 /* Create an entry in a CRIS ELF linker hash table. */
910 {
914 /* Allocate the structure if it has not already been allocated by a
915 subclass. */
923 /* Call the allocation method of the superclass. */
928 {
935 }
938 }
940 /* Create a CRIS ELF linker hash table. */
944 {
953 elf_cris_link_hash_newfunc,
955 CRIS_ELF_DATA))
956 {
959 }
961 /* Initialize to skip over the first three entries in the gotplt; they
962 are used for run-time symbol evaluation. */
965 /* We haven't seen any R_CRIS_nn_GOT_TPREL initially. */
969 }
970 \f
971 /* Perform a single relocation. By default we use the standard BFD
972 routines, with a few tweaks. */
974 static bfd_reloc_status_type
976 relocation)
982 bfd_vma relocation;
983 {
984 bfd_reloc_status_type r;
987 /* PC-relative relocations are relative to the position *after*
988 the reloc. Note that for R_CRIS_8_PCREL the adjustment is
989 not a single byte, since PC must be 16-bit-aligned. */
991 {
992 /* Check that the 16-bit GOT relocs are positive. */
1002 /* Fall through. */
1010 }
1016 }
1017 \f
1019 /* The number of errors left before we stop outputting reloc-specific
1020 explanatory messages. By coincidence, this works nicely together
1021 with the default number of messages you'll get from LD about
1022 "relocation truncated to fit" messages before you get an
1023 "additional relocation overflows omitted from the output". */
1026 /* Relocate an CRIS ELF section. See elf32-fr30.c, from where this was
1027 copied, for further comments. */
1029 static bfd_boolean
1038 {
1067 {
1070 }
1073 {
1079 bfd_vma relocation;
1080 bfd_reloc_status_type r;
1097 {
1102 symname = (bfd_elf_string_from_elf_section
1106 }
1107 else
1108 {
1109 bfd_boolean warned;
1110 bfd_boolean unresolved_reloc;
1120 /* Perhaps we should detect the cases that
1121 sec->output_section is expected to be NULL like i386 and
1122 m68k, but apparently (and according to elfxx-ia64.c) all
1123 valid cases are where the symbol is defined in a shared
1124 object which we link dynamically against. This includes
1125 PLT relocs for which we've created a PLT entry and other
1126 relocs for which we're prepared to create dynamic
1127 relocations.
1129 For now, new situations cause us to just err when
1130 sec->output_offset is NULL but the object with the symbol
1131 is *not* dynamically linked against. Thus this will
1132 automatically remind us so we can see if there are other
1133 valid cases we need to revisit. */
1139 {
1140 /* Here follow the cases where the relocation value must
1141 be zero (or when further handling is simplified when
1142 zero). I can't claim to understand the various
1143 conditions and they weren't described in the files
1144 where I copied them from (elf32-m68k.c and
1145 elf32-i386.c), but let's mention examples of where
1146 they happen. FIXME: Perhaps define and use a
1147 dynamic_symbol_p function like ia64.
1149 - When creating a shared library, we can have an
1150 ordinary relocation for a symbol defined in a shared
1151 library (perhaps the one we create). We then make
1152 the relocation value zero, as the value seen now will
1153 be added into the relocation addend in this shared
1154 library, but must be handled only at dynamic-link
1155 time. FIXME: Not sure this example covers the
1156 h->elf_link_hash_flags test, though it's there in
1157 other targets. */
1170 {
1171 _bfd_error_handler
1173 input_bfd,
1174 input_section,
1176 symname);
1179 }
1180 }
1181 }
1184 {
1185 /* For relocs against symbols from removed linkonce sections,
1186 or sections discarded by a linker script, we just want the
1187 section contents zeroed. Avoid any special processing. */
1192 }
1198 {
1201 /* This is like the case for R_CRIS_32_GOT and R_CRIS_16_GOT,
1202 but we require a PLT, and the PLT handling will take care of
1203 filling in the PLT-specific GOT entry. For the GOT offset,
1204 calculate it as we do when filling it in for the .got.plt
1205 section. If we don't have a PLT, punt to GOT handling. */
1208 {
1209 asection *sgotplt
1211 bfd_vma got_offset;
1216 got_offset
1221 }
1223 /* We didn't make a PLT entry for this symbol. Maybe everything is
1224 folded into the GOT. Other than folding, this happens when
1225 statically linking PIC code, or when using -Bsymbolic. Check
1226 that we instead have a GOT entry as done for us by
1227 elf_cris_adjust_dynamic_symbol, and drop through into the
1228 ordinary GOT cases. This must not happen for the
1229 executable, because any reference it does to a function
1230 that is satisfied by a DSO must generate a PLT. We assume
1231 these call-specific relocs don't address non-functions. */
1238 {
1245 input_bfd,
1246 input_section,
1251 /* FIXME: Perhaps blaming input is not the right thing to
1252 do; this is probably an internal error. But it is true
1253 that we didn't like that particular input. */
1256 }
1257 /* Fall through. */
1259 /* The size of the actual relocation is not used here; we only
1260 fill in the GOT table here. */
1263 {
1264 bfd_vma off;
1266 /* Note that despite using RELA relocations, the .got contents
1267 is always filled in with the link-relative relocation
1268 value; the addend. */
1271 {
1283 {
1284 /* This wasn't checked above for ! info->shared, but
1285 must hold there if we get here; the symbol must
1286 be defined in the regular program or be undefweak
1287 or be a function or otherwise need a PLT. */
1295 /* This is actually a static link, or it is a
1296 -Bsymbolic link and the symbol is defined locally,
1297 or is undefweak, or the symbol was forced to be
1298 local because of a version file, or we're not
1299 creating a dynamic object. We must initialize this
1300 entry in the global offset table. Since the offset
1301 must always be a multiple of 4, we use the least
1302 significant bit to record whether we have
1303 initialized it already.
1305 If this GOT entry should be runtime-initialized, we
1306 will create a .rela.got relocation entry to
1307 initialize the value. This is done in the
1308 finish_dynamic_symbol routine. */
1311 else
1312 {
1316 }
1317 }
1318 }
1319 else
1320 {
1326 /* The offset must always be a multiple of 4. We use
1327 the least significant bit to record whether we have
1328 already generated the necessary reloc. */
1331 else
1332 {
1336 {
1337 Elf_Internal_Rela outrel;
1341 srelgot
1353 }
1356 }
1357 }
1361 {
1362 /* We can't do anything for a relocation which is against
1363 a symbol *plus offset*. GOT holds relocations for
1364 symbols. Make this an error; the compiler isn't
1365 allowed to pass us these kinds of things. */
1370 input_bfd,
1371 input_section,
1374 else
1378 input_bfd,
1379 input_section,
1386 }
1387 }
1391 /* This relocation must only be performed against local symbols.
1392 It's also ok when we link a program and the symbol is either
1393 defined in an ordinary (non-DSO) object or is undefined weak. */
1400 {
1404 input_bfd,
1405 input_section,
1407 symname);
1410 }
1412 /* This can happen if we get a link error with the input ELF
1413 variant mismatching the output variant. Emit an error so
1414 it's noticed if it happens elsewhere. */
1416 {
1419 input_bfd,
1420 input_section,
1424 }
1426 /* This relocation is like a PC-relative one, except the
1427 reference point is the location of GOT. Note that
1428 sgot->output_offset is not involved in this calculation. We
1429 always want the start of entire .got section, not the
1430 position after the reserved header. */
1435 /* Relocation is to the entry for this symbol in the
1436 procedure linkage table. */
1438 /* Resolve a PLT_PCREL reloc against a local symbol directly,
1439 without using the procedure linkage table. */
1445 {
1446 /* We didn't make a PLT entry for this symbol. This
1447 happens when statically linking PIC code, or when
1448 using -Bsymbolic. */
1450 }
1458 /* Like R_CRIS_32_PLT_PCREL, but the reference point is the
1459 start of the .got section. See also comment at
1460 R_CRIS_32_GOT. */
1463 /* Resolve a PLT_GOTREL reloc against a local symbol directly,
1464 without using the procedure linkage table. */
1470 {
1471 /* We didn't make a PLT entry for this symbol. This
1472 happens when statically linking PIC code, or when
1473 using -Bsymbolic. */
1475 }
1486 /* If the symbol was local, we need no shlib-specific handling. */
1491 /* Fall through. */
1503 {
1504 Elf_Internal_Rela outrel;
1508 /* When generating a shared object, these relocations
1509 are copied into the output file to be resolved at run
1510 time. */
1513 {
1514 sreloc = _bfd_elf_get_dynamic_reloc_section
1516 /* The section should have been created in cris_elf_check_relocs,
1517 but that function will not be called for objects which fail in
1518 cris_elf_merge_private_bfd_data. */
1520 {
1523 }
1524 }
1535 /* For now, undefined weak symbols with non-default
1536 visibility (yielding 0), like exception info for
1537 discarded sections, will get a R_CRIS_NONE
1538 relocation rather than no relocation, because we
1539 notice too late that the symbol doesn't need a
1540 relocation. */
1550 /* h->dynindx may be -1 if the symbol was marked to
1551 become local. */
1555 {
1559 }
1560 else
1561 {
1565 {
1568 }
1569 else
1570 {
1576 {
1579 }
1580 else
1581 {
1584 /* We are turning this relocation into one
1585 against a section symbol. It would be
1586 proper to subtract the symbol's value,
1587 osec->vma, from the emitted reloc addend,
1588 but ld.so expects buggy relocs. */
1592 {
1595 }
1597 }
1600 }
1601 }
1607 /* This reloc will be computed at runtime, so there's no
1608 need to do anything now, except for R_CRIS_32 relocations
1609 that have been turned into R_CRIS_RELATIVE. */
1612 }
1618 /* This relocation must only be performed against local
1619 symbols, or to sections that are not loadable. It's also
1620 ok when we link a program and the symbol is defined in an
1621 ordinary (non-DSO) object (if it's undefined there, we've
1622 already seen an error). */
1629 {
1632 /* We shouldn't get here for GCC-emitted code. */
1636 " not allowed for `%s', a global symbol with default"
1638 input_bfd,
1639 input_section,
1645 }
1650 /* Fill in a R_CRIS_DTPMOD reloc at offset 3 if we haven't
1651 already done so. Note that we do this in .got.plt, not
1652 in .got, as .got.plt contains the first part, still the
1653 reloc is against .got, because the linker script directs
1654 (is required to direct) them both into .got. */
1657 {
1662 {
1663 Elf_Internal_Rela outrel;
1680 }
1681 else
1682 {
1683 /* For an executable, the GOT entry contents is known. */
1686 }
1688 /* Reverse the sign to mark that we've emitted the
1689 required GOT entry. */
1691 }
1693 /* The relocation is the offset from the start of the module
1694 TLS block to the (local) symbol. */
1701 {
1704 /* We've already informed in cris_elf_check_relocs that
1705 this is an error. */
1707 }
1708 /* Fall through. */
1713 {
1714 /* We can't do anything for a relocation which is against a
1715 symbol *plus offset*. The GOT holds relocations for
1716 symbols. Make this an error; the compiler isn't allowed
1717 to pass us these kinds of things. */
1721 input_bfd,
1722 input_section,
1729 }
1733 {
1734 /* Known contents of the GOT. */
1735 bfd_vma off;
1737 /* The symbol is defined in the program, so just write
1738 (1, known_tpoffset) into the GOT. */
1742 {
1745 }
1746 else
1747 {
1751 }
1753 /* We use bit 1 of the offset as a flag for GOT entry with
1754 the R_CRIS_DTP reloc, setting it when we've emitted the
1755 GOT entry and reloc. Bit 0 is used for R_CRIS_32_TPREL
1756 relocs. */
1758 {
1763 else
1768 }
1769 else
1774 }
1775 else
1776 {
1777 /* Not all parts of the GOT entry are known; emit a real
1778 relocation. */
1779 bfd_vma off;
1784 else
1785 {
1789 }
1791 /* See above re bit 1 and bit 0 usage. */
1793 {
1794 Elf_Internal_Rela outrel;
1801 else
1804 /* Clear the target contents of the GOT (just as a
1805 gesture; it's already cleared on allocation): this
1806 relocation is not like the other dynrelocs. */
1815 {
1818 }
1819 else
1820 {
1823 /* NULL if we had an error. */
1826 }
1835 /* NULL if we had an error. */
1838 }
1839 else
1844 }
1846 /* The GOT-relative offset to the GOT entry is the
1847 relocation, or for R_CRIS_32_GD, the actual address of
1848 the GOT entry. */
1853 {
1856 /* We've already informed in cris_elf_check_relocs that
1857 this is an error. */
1859 }
1860 /* Fall through. */
1865 {
1866 /* We can't do anything for a relocation which is
1867 against a symbol *plus offset*. GOT holds
1868 relocations for symbols. Make this an error; the
1869 compiler isn't allowed to pass us these kinds of
1870 things. */
1874 input_bfd,
1875 input_section,
1881 }
1884 {
1885 /* Known contents of the GOT. */
1886 bfd_vma off;
1888 /* The symbol is defined in the program, so just write
1889 the -prog_tls_size+known_tpoffset into the GOT. */
1895 else
1898 /* Bit 0 is used to mark whether we've emitted the required
1899 entry (and if needed R_CRIS_32_TPREL reloc). Bit 1
1900 is used similarly for R_CRIS_DTP, see above. */
1902 {
1907 else
1911 }
1912 else
1917 }
1918 else
1919 {
1920 /* Emit a real relocation. */
1921 bfd_vma off;
1925 else
1928 /* See above re usage of bit 0 and 1. */
1930 {
1931 Elf_Internal_Rela outrel;
1938 else
1946 {
1949 }
1950 else
1951 {
1954 /* NULL if we had an error. */
1957 }
1959 /* Just "define" the initial contents in some
1960 semi-logical way. */
1969 /* NULL if we had an error. */
1972 }
1973 else
1978 }
1980 /* The GOT-relative offset to the GOT entry is the relocation,
1981 or for R_CRIS_32_GD, the actual address of the GOT entry. */
1986 /* This relocation must only be performed against symbols
1987 defined in an ordinary (non-DSO) object. */
1989 {
1992 /* We've already informed in cris_elf_check_relocs that
1993 this is an error. */
1995 }
2000 /* If it's undefined, then an error message has already
2001 been emitted. */
2003 {
2006 " not allowed for symbol: `%s'"
2007 " which is defined outside the program,"
2009 input_bfd,
2010 input_section,
2012 symname);
2015 }
2017 /* NULL if we had an error. */
2023 /* The TLS-relative offset is the relocation. */
2029 }
2035 {
2039 {
2045 {
2046 additional_relocation_error_msg_count--;
2048 {
2052 /* Not just TLS is involved here, so we make
2053 generation and message depend on -fPIC/-fpic
2054 only. */
2066 " -msmall-tls: recompile with -fPIC or"
2070 /* No known cause for overflow for other relocs. */
2073 }
2074 }
2080 TRUE);
2098 }
2106 }
2107 }
2110 }
2111 \f
2112 /* Finish up dynamic symbol handling. We set the contents of various
2113 dynamic sections here. */
2115 static bfd_boolean
2120 {
2124 /* Where in the plt entry to put values. */
2127 /* What offset to add to the distance to the first PLT entry for the
2128 value at plt_off3. */
2131 /* Where in the PLT entry the call-dynlink-stub is (happens to be same
2132 for PIC and non-PIC for v32 and pre-v32). */
2142 /* Adjust the various PLT entry offsets. */
2144 {
2152 }
2157 {
2162 bfd_vma got_base;
2164 bfd_vma gotplt_offset
2166 Elf_Internal_Rela rela;
2170 /* Get the index in the .rela.plt relocations for the .got.plt
2171 entry that corresponds to this symbol.
2172 We have to count backwards here, and the result is only valid
2173 as an index into .rela.plt. We also have to undo the effect
2174 of the R_CRIS_DTPMOD entry at .got index 3 (offset 12 into
2175 .got.plt) for which gotplt_offset is adjusted, because while
2176 that entry goes into .got.plt, its relocation goes into
2177 .rela.got, not .rela.plt. (It's not PLT-specific; not to be
2178 processed as part of the runtime lazy .rela.plt relocation).
2179 FIXME: There be literal constants here... */
2180 bfd_vma rela_plt_index
2184 /* Get the offset into the .got table of the entry that corresponds
2185 to this function. Note that we embed knowledge that "incoming"
2186 .got goes after .got.plt in the output without padding (pointer
2187 aligned). However, that knowledge is present in several other
2188 places too. */
2189 bfd_vma got_offset
2190 = (has_gotplt
2191 ? gotplt_offset
2194 /* This symbol has an entry in the procedure linkage table. Set it
2195 up. */
2208 /* Fill in the entry in the procedure linkage table. */
2210 {
2212 plt_entry_size);
2214 /* We need to enter the absolute address of the GOT entry here. */
2217 }
2218 else
2219 {
2221 plt_entry_size);
2224 }
2226 /* Fill in the plt entry and make a relocation, if this is a "real"
2227 PLT entry. */
2229 {
2230 /* Fill in the offset to the reloc table. */
2235 /* Fill in the offset to the first PLT entry, where to "jump". */
2240 /* Fill in the entry in the global offset table with the address of
2241 the relocating stub. */
2249 /* Fill in the entry in the .rela.plt section. */
2257 }
2260 {
2261 /* Mark the symbol as undefined, rather than as defined in
2262 the .plt section. Leave the value alone. */
2265 /* FIXME: From elf32-sparc.c 2001-02-19 (1.18). I still don't
2266 know whether resetting the value is significant; if it really
2267 is, rather than a quirk or bug in the sparc port, then I
2268 believe we'd see this elsewhere. */
2269 /* If the symbol is weak, we do need to clear the value.
2270 Otherwise, the PLT entry would provide a definition for
2271 the symbol even if the symbol wasn't defined anywhere,
2272 and so the symbol would never be NULL. */
2275 }
2276 }
2278 /* For an ordinary program, we emit .got relocs only for symbols that
2279 are in the dynamic-symbols table and are either defined by the
2280 program or are undefined weak symbols, or are function symbols
2281 where we do not output a PLT: the PLT reloc was output above and all
2282 references to the function symbol are redirected to the PLT. */
2290 {
2293 Elf_Internal_Rela rela;
2297 /* This symbol has an entry in the global offset table. Set it up. */
2307 /* If this is a static link, or it is a -Bsymbolic link and the
2308 symbol is defined locally or was forced to be local because
2309 of a version file, we just want to emit a RELATIVE reloc.
2310 The entry in the global offset table will already have been
2311 initialized in the relocate_section function. */
2317 {
2320 }
2321 else
2322 {
2326 }
2331 }
2334 {
2336 Elf_Internal_Rela rela;
2339 /* This symbol needs a copy reloc. Set it up. */
2356 }
2358 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2364 }
2365 \f
2366 /* Finish up the dynamic sections. Do *not* emit relocs here, as their
2367 offsets were changed, as part of -z combreloc handling, from those we
2368 computed. */
2370 static bfd_boolean
2374 {
2386 {
2396 {
2397 Elf_Internal_Dyn dyn;
2403 {
2415 /* Yes, we *can* have a .plt and no .plt.rela, for instance
2416 if all symbols are found in the .got (not .got.plt). */
2426 else
2432 /* The procedure linkage table relocs (DT_JMPREL) should
2433 not be included in the overall relocs (DT_RELA).
2434 Therefore, we override the DT_RELASZ entry here to
2435 make it not include the JMPREL relocs. Since the
2436 linker script arranges for .rela.plt to follow all
2437 other relocation sections, we don't have to worry
2438 about changing the DT_RELA entry. */
2444 }
2445 }
2447 /* Fill in the first entry in the procedure linkage table. */
2449 {
2451 {
2454 PLT_ENTRY_SIZE_V32);
2455 else
2456 {
2458 PLT_ENTRY_SIZE_V32);
2466 }
2467 }
2468 else
2469 {
2472 PLT_ENTRY_SIZE);
2473 else
2474 {
2476 PLT_ENTRY_SIZE);
2488 }
2489 }
2490 }
2491 }
2493 /* Fill in the first three entries in the global offset table. */
2495 {
2498 else
2504 }
2509 }
2510 \f
2511 /* Return the section that should be marked against GC for a given
2512 relocation. */
2520 {
2524 {
2531 }
2534 }
2536 /* Update the got entry reference counts for the section being removed. */
2538 static bfd_boolean
2543 {
2573 {
2582 {
2587 }
2591 {
2620 }
2623 {
2633 {
2634 /* If the counters are 0 when we got here, we've
2635 miscounted somehow somewhere, an internal error. */
2642 {
2643 /* We don't need the .got entry any more. */
2646 }
2648 }
2650 local_got_reloc:
2652 {
2653 /* If the counters are 0 when we got here, we've
2654 miscounted somehow somewhere, an internal error. */
2661 {
2662 /* We don't need the .got entry any more. */
2666 }
2667 }
2672 /* For local symbols, treat these like GOT relocs. */
2675 /* Fall through. */
2678 /* FIXME: We don't garbage-collect away the .got section. */
2681 /* Fall through. */
2688 {
2692 }
2696 /* This'd be a .dtpreld entry in e.g. debug info. */
2699 /* Fall through. */
2710 }
2711 }
2714 }
2716 /* The elf_backend_plt_sym_val hook function. */
2718 static bfd_vma
2721 {
2722 bfd_size_type plt_entry_size;
2724 plt_entry_size
2729 }
2731 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
2732 entry but we found we will not create any. Called when we find we will
2733 not have any PLT for this symbol, by for example
2734 elf_cris_adjust_dynamic_symbol when we're doing a proper dynamic link,
2735 or elf_cris_size_dynamic_sections if no dynamic sections will be
2736 created (we're only linking static objects). */
2738 static bfd_boolean
2741 PTR p;
2742 {
2748 /* If nobody wanted a GOTPLT with this symbol, we're done. */
2753 {
2754 /* There's a GOT entry for this symbol. Just adjust the refcounts.
2755 Probably not necessary at this stage, but keeping them accurate
2756 helps avoiding surprises later. */
2760 }
2761 else
2762 {
2763 /* No GOT entry for this symbol. We need to create one. */
2772 /* Put accurate refcounts there. */
2778 /* We always have a .got and a .rela.got section if there were
2779 GOTPLT relocs in input. */
2782 /* Allocate space in the .got section. */
2785 /* Allocate relocation space. */
2787 }
2790 }
2792 /* Try to fold PLT entries with GOT entries. There are two cases when we
2793 want to do this:
2795 - When all PLT references are GOTPLT references, and there are GOT
2796 references, and this is not the executable. We don't have to
2797 generate a PLT at all.
2799 - When there are both (ordinary) PLT references and GOT references,
2800 and this isn't the executable.
2801 We want to make the PLT reference use the ordinary GOT entry rather
2802 than R_CRIS_JUMP_SLOT, a run-time dynamically resolved GOTPLT entry,
2803 since the GOT entry will have to be resolved at startup anyway.
2805 Though the latter case is handled when room for the PLT is allocated,
2806 not here.
2808 By folding into the GOT, we may need a round-trip to a PLT in the
2809 executable for calls, a loss in performance. Still, losing a
2810 reloc is a win in size and at least in start-up time.
2812 Note that this function is called before symbols are forced local by
2813 version scripts. The differing cases are handled by
2814 elf_cris_hide_symbol. */
2816 static bfd_boolean
2819 PTR p;
2820 {
2823 /* If there are no GOT references for this symbol, we can't fold any
2824 other reference so there's nothing to do. Likewise if there are no
2825 PLT references; GOTPLT references included. */
2829 /* GOTPLT relocs are supposed to be included into the PLT refcount. */
2833 {
2834 /* The only PLT references are GOTPLT references, and there are GOT
2835 references. Convert PLT to GOT references. */
2839 /* Clear the PLT references, so no PLT will be created. */
2841 }
2844 }
2846 /* Our own version of hide_symbol, so that we can adjust a GOTPLT reloc
2847 to use a GOT entry (and create one) rather than requiring a GOTPLT
2848 entry. */
2850 static void
2854 bfd_boolean force_local;
2855 {
2859 }
2861 /* Adjust a symbol defined by a dynamic object and referenced by a
2862 regular object. The current definition is in some section of the
2863 dynamic object, but we're not including those sections. We have to
2864 change the definition to something the rest of the link can
2865 understand. */
2867 static bfd_boolean
2870 {
2874 bfd_size_type plt_entry_size;
2882 /* Make sure we know what is going on here. */
2890 plt_entry_size
2894 /* If this is a function, put it in the procedure linkage table. We
2895 will fill in the contents of the procedure linkage table later,
2896 when we know the address of the .got section. */
2899 {
2900 /* If we link a program (not a DSO), we'll get rid of unnecessary
2901 PLT entries; we point to the actual symbols -- even for pic
2902 relocs, because a program built with -fpic should have the same
2903 result as one built without -fpic, specifically considering weak
2904 symbols.
2905 FIXME: m68k and i386 differ here, for unclear reasons. */
2908 {
2909 /* This case can occur if we saw a PLT reloc in an input file,
2910 but the symbol was not defined by a dynamic object. In such
2911 a case, we don't actually need to build a procedure linkage
2912 table, and we can just do an absolute or PC reloc instead, or
2913 change a .got.plt index to a .got index for GOTPLT relocs. */
2917 return
2920 info);
2921 }
2923 /* If we had a R_CRIS_GLOB_DAT that didn't have to point to a PLT;
2924 where a pointer-equivalent symbol was unimportant (i.e. more
2925 like R_CRIS_JUMP_SLOT after symbol evaluation) we could get rid
2926 of the PLT. We can't for the executable, because the GOT
2927 entries will point to the PLT there (and be constant). */
2933 /* GC or folding may have rendered this entry unused. */
2935 {
2939 }
2941 /* Make sure this symbol is output as a dynamic symbol. */
2943 {
2946 }
2951 /* If this is the first .plt entry, make room for the special
2952 first entry. */
2956 /* If this symbol is not defined in a regular file, and we are
2957 not generating a shared library, then set the symbol to this
2958 location in the .plt. */
2961 {
2964 }
2966 /* If there's already a GOT entry, use that, not a .got.plt. A
2967 GOT field still has a reference count when we get here; it's
2968 not yet changed to an offset. We can't do this for an
2969 executable, because then the reloc associated with the PLT
2970 would get a non-PLT reloc pointing to the PLT. FIXME: Move
2971 this to elf_cris_try_fold_plt_to_got. */
2973 {
2976 /* Mark the PLT offset to use the GOT entry by setting the low
2977 bit in the plt offset; it is always a multiple of
2978 plt_entry_size (which is at least a multiple of 2). */
2981 /* Change the PLT refcount to an offset. */
2984 /* By not setting gotplt_offset (i.e. it remains at 0), we signal
2985 that the got entry should be used instead. */
2989 /* Make room for this entry. */
2993 }
2995 /* No GOT reference for this symbol; prepare for an ordinary PLT. */
2998 /* Make room for this entry. */
3001 /* We also need to make an entry in the .got.plt section, which
3002 will be placed in the .got section by the linker script. */
3011 /* We also need to make an entry in the .rela.plt section. */
3018 }
3020 /* Reinitialize the plt offset now that it is not used as a reference
3021 count any more. */
3024 /* If this is a weak symbol, and there is a real definition, the
3025 processor independent code will have arranged for us to see the
3026 real definition first, and we can just use the same value. */
3028 {
3034 }
3036 /* This is a reference to a symbol defined by a dynamic object which
3037 is not a function. */
3039 /* If we are creating a shared library, we must presume that the
3040 only references to the symbol are via the global offset table.
3041 For such cases we need not do anything here; the relocations will
3042 be handled correctly by relocate_section. */
3046 /* If there are no references to this symbol that do not use the
3047 GOT, we don't need to generate a copy reloc. */
3052 {
3056 }
3058 /* We must allocate the symbol in our .dynbss section, which will
3059 become part of the .bss section of the executable. There will be
3060 an entry for this symbol in the .dynsym section. The dynamic
3061 object will contain position independent code, so all references
3062 from the dynamic object to this symbol will go through the global
3063 offset table. The dynamic linker will use the .dynsym entry to
3064 determine the address it must put in the global offset table, so
3065 both the dynamic object and the regular object will refer to the
3066 same memory location for the variable. */
3071 /* We must generate a R_CRIS_COPY reloc to tell the dynamic linker to
3072 copy the initial value out of the dynamic object and into the
3073 runtime process image. We need to remember the offset into the
3074 .rela.bss section we are going to use. */
3076 {
3083 }
3086 }
3088 /* Adjust our "subclass" elements for an indirect symbol. */
3090 static void
3094 {
3100 /* Only indirect symbols are replaced; we're not interested in
3101 updating any of EIND's fields for other symbols. */
3103 {
3104 /* Still, we need to copy flags for e.g. weak definitions. */
3107 }
3111 #define XMOVOPZ(F, OP, Z) edir->F OP eind->F; eind->F = Z
3112 #define XMOVE(F) XMOVOPZ (F, +=, 0)
3114 {
3116 {
3120 /* Add reloc counts against the indirect sym to the direct sym
3121 list. Merge any entries against the same section. */
3123 {
3128 {
3132 }
3135 }
3137 }
3139 }
3145 #undef XMOVE
3146 #undef XMOVOPZ
3149 }
3151 /* Look through the relocs for a section during the first phase. */
3153 static bfd_boolean
3158 {
3188 {
3197 {
3200 }
3201 else
3202 {
3207 }
3211 /* Some relocs require linker-created sections; we need to hang them
3212 on the first input bfd we found that contained dynamic relocs. */
3214 {
3217 /* This'd be a .dtpreld entry in e.g. debug info. We have
3218 several different switch statements below, but none of
3219 that is needed; we need no preparations for resolving
3220 R_CRIS_32_DTPREL into a non-allocated section (debug
3221 info), so let's just move on to the next
3222 relocation. */
3224 /* Fall through. */
3226 /* The first .got.plt entry is right after the R_CRIS_DTPMOD
3227 entry at index 3. */
3232 /* Fall through. */
3248 {
3251 /* We could handle this if we can get a handle on the
3252 output bfd in elf_cris_adjust_dynamic_symbol. Failing
3253 that, we must insist on dynobj being a specific mach. */
3255 {
3261 }
3263 /* Create the .got section, so we can assume it's always
3264 present whenever there's a dynobj. */
3267 }
3273 {
3274 bfd_size_type amt;
3276 /* We use index local_got_refcounts[-1] to count all
3277 GOT-relative relocations that do not have explicit
3278 GOT entries. */
3285 local_got_refcounts++;
3287 }
3292 }
3294 /* Some relocs require a global offset table (but perhaps not a
3295 specific GOT entry). */
3297 {
3300 /* Not requesting .got.rela for an executable: the contents
3301 of the first entry is constant there. For a shared
3302 library, we need .got.rela for the R_CRIS_DTPMOD
3303 relocation at index 3. */
3306 /* Fall through. */
3314 /* Fall through. */
3316 /* For R_CRIS_16_GOTPLT and R_CRIS_32_GOTPLT, we need a GOT
3317 entry only for local symbols. Unfortunately, we don't know
3318 until later on if there's a version script that forces the
3319 symbol local. We must have the .rela.got section in place
3320 before we know if the symbol looks global now, so we need
3321 to treat the reloc just like for R_CRIS_16_GOT and
3322 R_CRIS_32_GOT. */
3329 {
3332 {
3335 (SEC_ALLOC
3336 | SEC_LOAD
3337 | SEC_HAS_CONTENTS
3338 | SEC_IN_MEMORY
3339 | SEC_LINKER_CREATED
3344 }
3345 }
3350 }
3352 /* Warn and error for invalid input. */
3354 {
3360 {
3363 " in a shared object;"
3365 abfd,
3366 sec,
3368 /* Don't return FALSE here; we want messages for all of
3369 these and the error behavior is ungraceful
3370 anyway. */
3371 }
3374 }
3377 {
3381 /* These are requests for tls_index entries, run-time R_CRIS_DTP. */
3388 /* These two just request for the constant-index
3389 module-local tls_index-sized GOT entry, which we add
3390 elsewhere. */
3398 /* Those relocs also require that a DSO is of type
3399 Initial Exec. Like other targets, we don't reset this
3400 flag even if the relocs are GC:ed away. */
3405 /* Let's list the other assembler-generated TLS-relocs too,
3406 just to show that they're not forgotten. */
3411 }
3414 {
3417 /* Mark that we need a GOT entry if the PLT entry (and its GOT
3418 entry) is eliminated. We can only do this for a non-local
3419 symbol. */
3421 {
3424 }
3425 /* If h is NULL then this is a local symbol, and we must make a
3426 GOT entry for it, so handle it like a GOT reloc. */
3427 /* Fall through. */
3437 /* This symbol requires a global offset table entry. */
3439 {
3441 {
3442 /* Make sure this symbol is output as a dynamic symbol. */
3444 {
3447 }
3448 }
3450 /* Update the sum of reloc counts for this symbol. */
3454 {
3458 {
3459 /* Allocate space in the .got section. */
3461 /* Allocate relocation space. */
3463 }
3471 {
3472 /* Allocate space in the .got section. */
3474 /* Allocate relocation space. */
3476 }
3484 {
3485 /* Allocate space in the .got section. */
3487 /* Allocate relocation space. */
3489 }
3496 }
3497 }
3498 else
3499 {
3500 /* This is a global offset table entry for a local symbol. */
3502 {
3505 {
3506 /* If we are generating a shared object, we need
3507 to output a R_CRIS_RELATIVE reloc so that the
3508 dynamic linker can adjust this GOT entry.
3509 Similarly for non-regular got entries. */
3511 }
3512 }
3513 /* Update the reloc-specific count. */
3516 /* This one is the sum of all the others. */
3518 }
3524 /* This reference requires a global offset table.
3525 FIXME: The actual refcount isn't used currently; the .got
3526 section can't be removed if there were any references in the
3527 input. */
3531 handle_gotplt_reloc:
3534 /* This reference requires a global offset table. */
3536 /* Fall through. */
3539 /* This symbol requires a procedure linkage table entry. We
3540 actually build the entry in adjust_dynamic_symbol,
3541 because this might be a case of linking PIC code which is
3542 never referenced by a dynamic object, in which case we
3543 don't need to generate a procedure linkage table entry
3544 after all. */
3546 /* Beware: if we'd check for visibility of the symbol here
3547 (and not marking the need for a PLT when non-visible), we'd
3548 get into trouble with keeping handling consistent with
3549 regards to relocs found before definition and GOTPLT
3550 handling. Eliminable PLT entries will be dealt with later
3551 anyway. */
3562 /* Let's help debug shared library creation. Any of these
3563 relocs *can* be used in shared libs, but pages containing
3564 them cannot be shared, so they're not appropriate for
3565 common use. Don't warn for sections we don't care about,
3566 such as debug sections or non-constant sections. We
3567 can't help tables of (global) function pointers, for
3568 example, though they must be emitted in a (writable) data
3569 section to avoid having impure text sections. */
3573 {
3574 /* FIXME: How do we make this optionally a warning only? */
3578 abfd,
3579 sec,
3581 }
3583 {
3586 /* Make sure a plt entry is created for this symbol if it
3587 turns out to be a function defined by a dynamic object. */
3590 }
3592 /* If we are creating a shared library and this is not a local
3593 symbol, we need to copy the reloc into the shared library.
3594 However when linking with -Bsymbolic and this is a global
3595 symbol which is defined in an object we are including in the
3596 link (i.e., DEF_REGULAR is set), then we can resolve the
3597 reloc directly. At this point we have not seen all the input
3598 files, so it is possible that DEF_REGULAR is not set now but
3599 will be set later (it is never cleared). In case of a weak
3600 definition, DEF_REGULAR may be cleared later by a strong
3601 definition in a shared library. We account for that
3602 possibility below by storing information in the relocs_copied
3603 field of the hash table entry. A similar situation occurs
3604 when creating shared libraries and symbol visibility changes
3605 render the symbol local. */
3607 /* No need to do anything if we're not creating a shared object. */
3611 /* We don't need to handle relocs into sections not going into
3612 the "real" output. */
3616 /* We may need to create a reloc section in the dynobj and made room
3617 for this reloc. */
3619 {
3620 sreloc = _bfd_elf_make_dynamic_reloc_section
3625 }
3637 {
3640 /* Make sure a plt entry is created for this symbol if it
3641 turns out to be a function defined by a dynamic object. */
3644 }
3646 /* If we are creating a shared library and this is not a local
3647 symbol, we need to copy the reloc into the shared library.
3648 However when linking with -Bsymbolic and this is a global
3649 symbol which is defined in an object we are including in the
3650 link (i.e., DEF_REGULAR is set), then we can resolve the
3651 reloc directly. At this point we have not seen all the input
3652 files, so it is possible that DEF_REGULAR is not set now but
3653 will be set later (it is never cleared). In case of a weak
3654 definition, DEF_REGULAR may be cleared later by a strong
3655 definition in a shared library. We account for that
3656 possibility below by storing information in the relocs_copied
3657 field of the hash table entry. A similar situation occurs
3658 when creating shared libraries and symbol visibility changes
3659 render the symbol local. */
3661 /* No need to do anything if we're not creating a shared object. */
3665 /* We don't need to handle relocs into sections not going into
3666 the "real" output. */
3670 /* If the symbol is local, then we know already we can
3671 eliminate the reloc. */
3675 /* If this is with -Bsymbolic and the symbol isn't weak, and
3676 is defined by an ordinary object (the ones we include in
3677 this shared library) then we can also eliminate the
3678 reloc. See comment above for more eliminable cases which
3679 we can't identify at this time. */
3685 /* We may need to create a reloc section in the dynobj and made room
3686 for this reloc. */
3688 {
3689 sreloc = _bfd_elf_make_dynamic_reloc_section
3694 }
3698 /* We count the number of PC relative relocations we have
3699 entered for this symbol, so that we can discard them
3700 again if the symbol is later defined by a regular object.
3701 We know that h is really a pointer to an
3702 elf_cris_link_hash_entry. */
3703 {
3714 {
3724 }
3727 }
3730 /* This relocation describes the C++ object vtable hierarchy.
3731 Reconstruct it for later use during GC. */
3737 /* This relocation describes which C++ vtable entries are actually
3738 used. Record for later use during GC. */
3748 /* Already warned above, when necessary. */
3752 /* Other relocs do not appear here. */
3755 }
3756 }
3759 }
3761 /* Set the sizes of the dynamic sections. */
3763 static bfd_boolean
3766 {
3770 bfd_boolean plt;
3771 bfd_boolean relocs;
3781 {
3782 /* Set the contents of the .interp section to the interpreter. */
3784 {
3789 }
3790 }
3791 else
3792 {
3793 /* Adjust all expected GOTPLT uses to use a GOT entry instead. */
3795 info);
3797 /* We may have created entries in the .rela.got section.
3798 However, if we are not creating the dynamic sections, we will
3799 not actually use these entries. Reset the size of .rela.got,
3800 which will cause it to get stripped from the output file
3801 below. */
3805 }
3807 /* If this is a -Bsymbolic shared link, then we need to discard all PC
3808 relative relocs against symbols defined in a regular object. We
3809 allocated space for them in the check_relocs routine, but we will not
3810 fill them in in the relocate_section routine. We also discard space
3811 for relocs that have become for local symbols due to symbol
3812 visibility changes. For programs, we discard space for relocs for
3813 symbols not referenced by any dynamic object. */
3816 elf_cris_discard_excess_dso_dynamics,
3817 info);
3818 else
3820 elf_cris_discard_excess_program_dynamics,
3821 info);
3823 /* The check_relocs and adjust_dynamic_symbol entry points have
3824 determined the sizes of the various dynamic sections. Allocate
3825 memory for them. */
3829 {
3835 /* It's OK to base decisions on the section name, because none
3836 of the dynobj section names depend upon the input files. */
3840 {
3841 /* Remember whether there is a PLT. */
3843 }
3845 {
3846 /* The .got.plt contains the .got header as well as the
3847 actual .got.plt contents. The .got header may contain a
3848 R_CRIS_DTPMOD entry at index 3. */
3851 }
3853 {
3860 {
3861 /* Remember whether there are any reloc sections other
3862 than .rela.plt. */
3866 /* We use the reloc_count field as a counter if we need
3867 to copy relocs into the output file. */
3869 }
3870 }
3873 {
3874 /* It's not one of our sections, so don't allocate space. */
3876 }
3879 {
3880 /* If we don't need this section, strip it from the
3881 output file. This is mostly to handle .rela.bss and
3882 .rela.plt. We must create both sections in
3883 create_dynamic_sections, because they must be created
3884 before the linker maps input sections to output
3885 sections. The linker does that before
3886 adjust_dynamic_symbol is called, and it is that
3887 function which decides whether anything needs to go
3888 into these sections. */
3891 }
3896 /* Allocate memory for the section contents. We use bfd_zalloc here
3897 in case unused entries are not reclaimed before the section's
3898 contents are written out. This should not happen, but this way
3899 if it does, we will not write out garbage. For reloc sections,
3900 this will make entries have the type R_CRIS_NONE. */
3904 }
3907 {
3908 /* Add some entries to the .dynamic section. We fill in the
3909 values later, in elf_cris_finish_dynamic_sections, but we
3910 must add the entries now so that we get the correct size for
3911 the .dynamic section. The DT_DEBUG entry is filled in by the
3912 dynamic linker and used by the debugger. */
3913 #define add_dynamic_entry(TAG, VAL) \
3914 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3917 {
3920 }
3923 {
3929 }
3932 {
3937 }
3940 {
3944 }
3945 }
3946 #undef add_dynamic_entry
3949 }
3951 /* This function is called via elf_cris_link_hash_traverse if we are
3952 creating a shared object. In the -Bsymbolic case, it discards the
3953 space allocated to copy PC relative relocs against symbols which
3954 are defined in regular objects. For the normal non-symbolic case,
3955 we also discard space for relocs that have become local due to
3956 symbol visibility changes. We allocated space for them in the
3957 check_relocs routine, but we won't fill them in in the
3958 relocate_section routine. */
3960 static bfd_boolean
3963 PTR inf;
3964 {
3971 /* If a symbol has been forced local or we have found a regular
3972 definition for the symbolic link case, then we won't be needing
3973 any relocs. */
3977 {
3979 {
3980 asection *sreloc
3986 }
3988 }
3990 /* If we have accounted for PC-relative relocs for read-only
3991 sections, now is the time to warn for them. We can't do it in
3992 cris_elf_check_relocs, because we don't know the status of all
3993 symbols at that time (and it's common to force symbols local
3994 late). */
3998 {
3999 /* FIXME: How do we make this optionally a warning only? */
4002 " relocation %s should not be used"
4010 }
4013 }
4015 /* This function is called via elf_cris_link_hash_traverse if we are *not*
4016 creating a shared object. We discard space for relocs for symbols put
4017 in the .got, but which we found we do not have to resolve at run-time. */
4019 static bfd_boolean
4022 PTR inf;
4023 {
4029 /* If we're not creating a shared library and have a symbol which is
4030 referred to by .got references, but the symbol is defined locally,
4031 (or rather, not defined by a DSO) then lose the reloc for the .got
4032 (don't allocate room for it). Likewise for relocs for something
4033 for which we create a PLT. */
4036 {
4038 /* The size of this section is only valid and in sync with the
4039 various reference counts if we do dynamic; don't decrement it
4040 otherwise. */
4042 {
4053 }
4055 /* If the locally-defined symbol isn't used by a DSO, then we don't
4056 have to export it as a dynamic symbol. This was already done for
4057 functions; doing this for all symbols would presumably not
4058 introduce new problems. Of course we don't do this if we're
4059 exporting all dynamic symbols. */
4064 {
4068 }
4069 }
4072 }
4074 /* Reject a file depending on presence and expectation of prefixed
4075 underscores on symbols. */
4077 static bfd_boolean
4080 {
4086 else
4088 }
4090 /* Mark presence or absence of leading underscore. Set machine type
4091 flags from mach type. */
4093 static void
4096 bfd_boolean linker ATTRIBUTE_UNUSED;
4097 {
4105 {
4121 }
4124 }
4126 /* Set the mach type from e_flags value. */
4128 static bfd_boolean
4132 {
4134 {
4148 /* Since we don't recognize them, we obviously can't support them
4149 with this code; we'd have to require that all future handling
4150 would be optional. */
4153 }
4156 }
4158 /* Display the flags field. */
4160 static bfd_boolean
4163 PTR ptr;
4164 {
4184 }
4186 /* Don't mix files with and without a leading underscore. */
4188 static bfd_boolean
4192 {
4205 {
4206 /* This happens when ld starts out with a 'blank' output file. */
4209 /* We ignore the linker-set mach, and instead set it according to
4210 the first input file. This would also happen if we could
4211 somehow filter out the OUTPUT_ARCH () setting from elf.sc.
4212 This allows us to keep the same linker config across
4213 cris(v0..v10) and crisv32. The drawback is that we can't force
4214 the output type, which might be a sane thing to do for a
4215 v10+v32 compatibility object. */
4218 }
4222 {
4227 ibfd);
4230 }
4235 {
4236 /* We can get an incompatible combination only if either is
4237 bfd_mach_cris_v32, and the other one isn't compatible. */
4242 {
4249 ibfd);
4252 }
4254 /* We don't have to check the case where the input is compatible
4255 with v10 and v32, because the output is already known to be set
4256 to the other (compatible) mach. */
4260 }
4263 }
4265 /* Do side-effects of e_flags copying to obfd. */
4267 static bfd_boolean
4271 {
4272 /* Call the base function. */
4276 /* If output is big-endian for some obscure reason, stop here. */
4284 /* Do what we really came here for. */
4286 }
4288 static enum elf_reloc_type_class
4291 {
4294 {
4303 }
4304 }
4306 /* The elf_backend_got_elt_size worker. For one symbol, we can have up to
4307 two GOT entries from three types with two different sizes. We handle
4308 it as a single entry, so we can use the regular offset-calculation
4309 machinery. */
4311 static bfd_vma
4317 {
4321 /* We may have one regular GOT entry or up to two TLS GOT
4322 entries. */
4324 {
4331 {
4332 /* We can't have a variable referred to both as a regular
4333 variable and through TLS relocs. */
4337 }
4344 }
4345 else
4346 {
4349 {
4350 /* The actual error-on-input is emitted elsewhere. */
4353 }
4360 }
4362 /* We're only called when h->got.refcount is non-zero, so we must
4363 have a non-zero size. */
4366 }
4367 \f
4368 #define ELF_ARCH bfd_arch_cris
4369 #define ELF_MACHINE_CODE EM_CRIS
4370 #define ELF_MAXPAGESIZE 0x2000
4372 #define TARGET_LITTLE_SYM bfd_elf32_cris_vec
4374 #define elf_symbol_leading_char 0
4376 #define elf_info_to_howto_rel NULL
4377 #define elf_info_to_howto cris_info_to_howto_rela
4378 #define elf_backend_relocate_section cris_elf_relocate_section
4379 #define elf_backend_gc_mark_hook cris_elf_gc_mark_hook
4380 #define elf_backend_gc_sweep_hook cris_elf_gc_sweep_hook
4381 #define elf_backend_plt_sym_val cris_elf_plt_sym_val
4382 #define elf_backend_check_relocs cris_elf_check_relocs
4383 #define elf_backend_grok_prstatus cris_elf_grok_prstatus
4384 #define elf_backend_grok_psinfo cris_elf_grok_psinfo
4386 #define elf_backend_can_gc_sections 1
4387 #define elf_backend_can_refcount 1
4389 #define elf_backend_object_p cris_elf_object_p
4390 #define elf_backend_final_write_processing \
4391 cris_elf_final_write_processing
4392 #define bfd_elf32_bfd_print_private_bfd_data \
4393 cris_elf_print_private_bfd_data
4394 #define bfd_elf32_bfd_merge_private_bfd_data \
4395 cris_elf_merge_private_bfd_data
4396 #define bfd_elf32_bfd_copy_private_bfd_data \
4397 cris_elf_copy_private_bfd_data
4399 #define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup
4400 #define bfd_elf32_bfd_reloc_name_lookup cris_reloc_name_lookup
4402 #define bfd_elf32_bfd_link_hash_table_create \
4403 elf_cris_link_hash_table_create
4404 #define elf_backend_adjust_dynamic_symbol \
4405 elf_cris_adjust_dynamic_symbol
4406 #define elf_backend_copy_indirect_symbol \
4407 elf_cris_copy_indirect_symbol
4408 #define elf_backend_size_dynamic_sections \
4409 elf_cris_size_dynamic_sections
4410 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4411 #define elf_backend_finish_dynamic_symbol \
4412 elf_cris_finish_dynamic_symbol
4413 #define elf_backend_finish_dynamic_sections \
4414 elf_cris_finish_dynamic_sections
4415 #define elf_backend_create_dynamic_sections \
4416 _bfd_elf_create_dynamic_sections
4417 #define bfd_elf32_bfd_final_link \
4418 bfd_elf_gc_common_final_link
4419 #define elf_backend_hide_symbol elf_cris_hide_symbol
4420 #define elf_backend_reloc_type_class elf_cris_reloc_type_class
4422 #define elf_backend_want_got_plt 1
4423 #define elf_backend_plt_readonly 1
4424 #define elf_backend_want_plt_sym 0
4425 #define elf_backend_got_header_size 12
4426 #define elf_backend_got_elt_size elf_cris_got_elt_size
4428 /* Later, we my want to optimize RELA entries into REL entries for dynamic
4429 linking and libraries (if it's a win of any significance). Until then,
4430 take the easy route. */
4431 #define elf_backend_may_use_rel_p 0
4432 #define elf_backend_may_use_rela_p 1
4433 #define elf_backend_rela_normal 1
4437 #undef TARGET_LITTLE_SYM
4438 #undef TARGET_LITTLE_NAME
4439 #undef elf_symbol_leading_char
4441 #define TARGET_LITTLE_SYM bfd_elf32_us_cris_vec
4444 #undef elf32_bed
4445 #define elf32_bed elf32_us_cris_bed