| blob | 2037b10f59ec6f82e628fe3c09532fcc45cb3f76 |
1 /* CRIS-specific support for 32-bit ELF.
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
3 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 (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
889 (info)))
891 /* Get the CRIS ELF linker hash table from a link_info structure. */
893 #define elf_cris_hash_table(p) \
894 ((struct elf_cris_link_hash_table *) (p)->hash)
896 /* Get the CRIS ELF linker hash entry from a regular hash entry (the
897 "parent class"). The .root reference is just a simple type
898 check on the argument. */
900 #define elf_cris_hash_entry(p) \
901 ((struct elf_cris_link_hash_entry *) (&(p)->root))
903 /* 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. */
945 {
954 elf_cris_link_hash_newfunc,
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
1040 {
1064 {
1067 }
1070 {
1076 bfd_vma relocation;
1077 bfd_reloc_status_type r;
1094 {
1099 symname = (bfd_elf_string_from_elf_section
1103 }
1104 else
1105 {
1106 bfd_boolean warned;
1107 bfd_boolean unresolved_reloc;
1117 /* Perhaps we should detect the cases that
1118 sec->output_section is expected to be NULL like i386 and
1119 m68k, but apparently (and according to elfxx-ia64.c) all
1120 valid cases are where the symbol is defined in a shared
1121 object which we link dynamically against. This includes
1122 PLT relocs for which we've created a PLT entry and other
1123 relocs for which we're prepared to create dynamic
1124 relocations.
1126 For now, new situations cause us to just err when
1127 sec->output_offset is NULL but the object with the symbol
1128 is *not* dynamically linked against. Thus this will
1129 automatically remind us so we can see if there are other
1130 valid cases we need to revisit. */
1136 {
1137 /* Here follow the cases where the relocation value must
1138 be zero (or when further handling is simplified when
1139 zero). I can't claim to understand the various
1140 conditions and they weren't described in the files
1141 where I copied them from (elf32-m68k.c and
1142 elf32-i386.c), but let's mention examples of where
1143 they happen. FIXME: Perhaps define and use a
1144 dynamic_symbol_p function like ia64.
1146 - When creating a shared library, we can have an
1147 ordinary relocation for a symbol defined in a shared
1148 library (perhaps the one we create). We then make
1149 the relocation value zero, as the value seen now will
1150 be added into the relocation addend in this shared
1151 library, but must be handled only at dynamic-link
1152 time. FIXME: Not sure this example covers the
1153 h->elf_link_hash_flags test, though it's there in
1154 other targets. */
1167 {
1168 _bfd_error_handler
1170 input_bfd,
1171 input_section,
1173 symname);
1176 }
1177 }
1178 }
1181 {
1182 /* For relocs against symbols from removed linkonce sections,
1183 or sections discarded by a linker script, we just want the
1184 section contents zeroed. Avoid any special processing. */
1189 }
1195 {
1198 /* This is like the case for R_CRIS_32_GOT and R_CRIS_16_GOT,
1199 but we require a PLT, and the PLT handling will take care of
1200 filling in the PLT-specific GOT entry. For the GOT offset,
1201 calculate it as we do when filling it in for the .got.plt
1202 section. If we don't have a PLT, punt to GOT handling. */
1205 {
1206 asection *sgotplt
1208 bfd_vma got_offset;
1213 got_offset
1218 }
1220 /* We didn't make a PLT entry for this symbol. Maybe everything is
1221 folded into the GOT. Other than folding, this happens when
1222 statically linking PIC code, or when using -Bsymbolic. Check
1223 that we instead have a GOT entry as done for us by
1224 elf_cris_adjust_dynamic_symbol, and drop through into the
1225 ordinary GOT cases. This must not happen for the
1226 executable, because any reference it does to a function
1227 that is satisfied by a DSO must generate a PLT. We assume
1228 these call-specific relocs don't address non-functions. */
1235 {
1242 input_bfd,
1243 input_section,
1248 /* FIXME: Perhaps blaming input is not the right thing to
1249 do; this is probably an internal error. But it is true
1250 that we didn't like that particular input. */
1253 }
1254 /* Fall through. */
1256 /* The size of the actual relocation is not used here; we only
1257 fill in the GOT table here. */
1260 {
1261 bfd_vma off;
1263 /* Note that despite using RELA relocations, the .got contents
1264 is always filled in with the link-relative relocation
1265 value; the addend. */
1268 {
1280 {
1281 /* This wasn't checked above for ! info->shared, but
1282 must hold there if we get here; the symbol must
1283 be defined in the regular program or be undefweak
1284 or be a function or otherwise need a PLT. */
1292 /* This is actually a static link, or it is a
1293 -Bsymbolic link and the symbol is defined locally,
1294 or is undefweak, or the symbol was forced to be
1295 local because of a version file, or we're not
1296 creating a dynamic object. We must initialize this
1297 entry in the global offset table. Since the offset
1298 must always be a multiple of 4, we use the least
1299 significant bit to record whether we have
1300 initialized it already.
1302 If this GOT entry should be runtime-initialized, we
1303 will create a .rela.got relocation entry to
1304 initialize the value. This is done in the
1305 finish_dynamic_symbol routine. */
1308 else
1309 {
1313 }
1314 }
1315 }
1316 else
1317 {
1323 /* The offset must always be a multiple of 4. We use
1324 the least significant bit to record whether we have
1325 already generated the necessary reloc. */
1328 else
1329 {
1333 {
1334 Elf_Internal_Rela outrel;
1338 srelgot
1350 }
1353 }
1354 }
1358 {
1359 /* We can't do anything for a relocation which is against
1360 a symbol *plus offset*. GOT holds relocations for
1361 symbols. Make this an error; the compiler isn't
1362 allowed to pass us these kinds of things. */
1367 input_bfd,
1368 input_section,
1371 else
1375 input_bfd,
1376 input_section,
1383 }
1384 }
1388 /* This relocation must only be performed against local symbols.
1389 It's also ok when we link a program and the symbol is either
1390 defined in an ordinary (non-DSO) object or is undefined weak. */
1397 {
1401 input_bfd,
1402 input_section,
1404 symname);
1407 }
1409 /* This can happen if we get a link error with the input ELF
1410 variant mismatching the output variant. Emit an error so
1411 it's noticed if it happens elsewhere. */
1413 {
1416 input_bfd,
1417 input_section,
1421 }
1423 /* This relocation is like a PC-relative one, except the
1424 reference point is the location of GOT. Note that
1425 sgot->output_offset is not involved in this calculation. We
1426 always want the start of entire .got section, not the
1427 position after the reserved header. */
1432 /* Relocation is to the entry for this symbol in the
1433 procedure linkage table. */
1435 /* Resolve a PLT_PCREL reloc against a local symbol directly,
1436 without using the procedure linkage table. */
1442 {
1443 /* We didn't make a PLT entry for this symbol. This
1444 happens when statically linking PIC code, or when
1445 using -Bsymbolic. */
1447 }
1455 /* Like R_CRIS_32_PLT_PCREL, but the reference point is the
1456 start of the .got section. See also comment at
1457 R_CRIS_32_GOT. */
1460 /* Resolve a PLT_GOTREL reloc against a local symbol directly,
1461 without using the procedure linkage table. */
1467 {
1468 /* We didn't make a PLT entry for this symbol. This
1469 happens when statically linking PIC code, or when
1470 using -Bsymbolic. */
1472 }
1483 /* If the symbol was local, we need no shlib-specific handling. */
1488 /* Fall through. */
1500 {
1501 Elf_Internal_Rela outrel;
1505 /* When generating a shared object, these relocations
1506 are copied into the output file to be resolved at run
1507 time. */
1510 {
1511 sreloc = _bfd_elf_get_dynamic_reloc_section
1513 /* The section should have been created in cris_elf_check_relocs,
1514 but that function will not be called for objects which fail in
1515 cris_elf_merge_private_bfd_data. */
1517 {
1520 }
1521 }
1532 /* For now, undefined weak symbols with non-default
1533 visibility (yielding 0), like exception info for
1534 discarded sections, will get a R_CRIS_NONE
1535 relocation rather than no relocation, because we
1536 notice too late that the symbol doesn't need a
1537 relocation. */
1547 /* h->dynindx may be -1 if the symbol was marked to
1548 become local. */
1552 {
1556 }
1557 else
1558 {
1562 {
1565 }
1566 else
1567 {
1573 {
1576 }
1577 else
1578 {
1581 /* We are turning this relocation into one
1582 against a section symbol. It would be
1583 proper to subtract the symbol's value,
1584 osec->vma, from the emitted reloc addend,
1585 but ld.so expects buggy relocs. */
1589 {
1594 }
1596 }
1599 }
1600 }
1606 /* This reloc will be computed at runtime, so there's no
1607 need to do anything now, except for R_CRIS_32 relocations
1608 that have been turned into R_CRIS_RELATIVE. */
1611 }
1617 /* This relocation must only be performed against local
1618 symbols, or to sections that are not loadable. It's also
1619 ok when we link a program and the symbol is defined in an
1620 ordinary (non-DSO) object (if it's undefined there, we've
1621 already seen an error). */
1628 {
1631 /* We shouldn't get here for GCC-emitted code. */
1635 " not allowed for `%s', a global symbol with default"
1637 input_bfd,
1638 input_section,
1644 }
1649 /* Fill in a R_CRIS_DTPMOD reloc at offset 3 if we haven't
1650 already done so. Note that we do this in .got.plt, not
1651 in .got, as .got.plt contains the first part, still the
1652 reloc is against .got, because the linker script directs
1653 (is required to direct) them both into .got. */
1656 {
1661 {
1662 Elf_Internal_Rela outrel;
1679 }
1680 else
1681 {
1682 /* For an executable, the GOT entry contents is known. */
1685 }
1687 /* Reverse the sign to mark that we've emitted the
1688 required GOT entry. */
1691 }
1693 /* The thread-based offset to the local symbol is the
1694 relocation.
1695 For the executable, TLS data begins at the thread pointer plus
1696 the negative size of the TLS data. For a DSO, that's part of
1697 the module TLS offset. */
1706 {
1709 /* We've already informed in cris_elf_check_relocs that
1710 this is an error. */
1712 }
1713 /* Fall through. */
1718 {
1719 /* We can't do anything for a relocation which is against a
1720 symbol *plus offset*. The GOT holds relocations for
1721 symbols. Make this an error; the compiler isn't allowed
1722 to pass us these kinds of things. */
1726 input_bfd,
1727 input_section,
1734 }
1738 {
1739 /* Known contents of the GOT. */
1740 bfd_vma off;
1742 /* The symbol is defined in the program, so just write
1743 (1, known_tpoffset) into the GOT. */
1747 {
1750 }
1751 else
1752 {
1756 }
1758 /* We use bit 1 of the offset as a flag for GOT entry with
1759 the R_CRIS_DTP reloc, setting it when we've emitted the
1760 GOT entry and reloc. Bit 0 is used for R_CRIS_32_TPREL
1761 relocs. */
1763 {
1768 else
1773 }
1774 else
1779 }
1780 else
1781 {
1782 /* Not all parts of the GOT entry are known; emit a real
1783 relocation. */
1784 bfd_vma off;
1789 else
1790 {
1794 }
1796 /* See above re bit 1 and bit 0 usage. */
1798 {
1799 Elf_Internal_Rela outrel;
1806 else
1809 /* Clear the target contents of the GOT (just as a
1810 gesture; it's already cleared on allocation): this
1811 relocation is not like the other dynrelocs. */
1820 {
1823 }
1824 else
1825 {
1828 /* NULL if we had an error. */
1831 }
1840 /* NULL if we had an error. */
1843 }
1844 else
1849 }
1851 /* The GOT-relative offset to the GOT entry is the
1852 relocation, or for R_CRIS_32_GD, the actual address of
1853 the GOT entry. */
1858 {
1861 /* We've already informed in cris_elf_check_relocs that
1862 this is an error. */
1864 }
1865 /* Fall through. */
1870 {
1871 /* We can't do anything for a relocation which is
1872 against a symbol *plus offset*. GOT holds
1873 relocations for symbols. Make this an error; the
1874 compiler isn't allowed to pass us these kinds of
1875 things. */
1879 input_bfd,
1880 input_section,
1886 }
1889 {
1890 /* Known contents of the GOT. */
1891 bfd_vma off;
1893 /* The symbol is defined in the program, so just write
1894 the -prog_tls_size+known_tpoffset into the GOT. */
1900 else
1903 /* Bit 0 is used to mark whether we've emitted the required
1904 entry (and if needed R_CRIS_32_TPREL reloc). Bit 1
1905 is used similarly for R_CRIS_DTP, see above. */
1907 {
1912 else
1916 }
1917 else
1922 }
1923 else
1924 {
1925 /* Emit a real relocation. */
1926 bfd_vma off;
1930 else
1933 /* See above re usage of bit 0 and 1. */
1935 {
1936 Elf_Internal_Rela outrel;
1943 else
1951 {
1954 }
1955 else
1956 {
1959 /* NULL if we had an error. */
1962 }
1964 /* Just "define" the initial contents in some
1965 semi-logical way. */
1974 /* NULL if we had an error. */
1977 }
1978 else
1983 }
1985 /* The GOT-relative offset to the GOT entry is the relocation,
1986 or for R_CRIS_32_GD, the actual address of the GOT entry. */
1991 /* This relocation must only be performed against symbols
1992 defined in an ordinary (non-DSO) object. */
1994 {
1997 /* We've already informed in cris_elf_check_relocs that
1998 this is an error. */
2000 }
2005 /* If it's undefined, then an error message has already
2006 been emitted. */
2008 {
2011 " not allowed for symbol: `%s'"
2012 " which is defined outside the program,"
2014 input_bfd,
2015 input_section,
2017 symname);
2020 }
2022 /* NULL if we had an error. */
2028 /* The TLS-relative offset is the relocation. */
2034 }
2040 {
2044 {
2050 {
2051 additional_relocation_error_msg_count--;
2053 {
2057 /* Not just TLS is involved here, so we make
2058 generation and message depend on -fPIC/-fpic
2059 only. */
2071 " -msmall-tls: recompile with -fPIC or"
2075 /* No known cause for overflow for other relocs. */
2078 }
2079 }
2085 TRUE);
2103 }
2111 }
2112 }
2115 }
2116 \f
2117 /* Finish up dynamic symbol handling. We set the contents of various
2118 dynamic sections here. */
2120 static bfd_boolean
2126 {
2129 /* Where in the plt entry to put values. */
2132 /* What offset to add to the distance to the first PLT entry for the
2133 value at plt_off3. */
2136 /* Where in the PLT entry the call-dynlink-stub is (happens to be same
2137 for PIC and non-PIC for v32 and pre-v32). */
2143 /* Adjust the various PLT entry offsets. */
2145 {
2153 }
2158 {
2163 bfd_vma got_base;
2165 bfd_vma gotplt_offset
2167 Elf_Internal_Rela rela;
2171 /* Get the index in the .rela.plt relocations for the .got.plt
2172 entry that corresponds to this symbol.
2173 We have to count backwards here, and the result is only valid
2174 as an index into .rela.plt. We also have to undo the effect
2175 of the R_CRIS_DTPMOD entry at .got index 3 (offset 12 into
2176 .got.plt) for which gotplt_offset is adjusted, because while
2177 that entry goes into .got.plt, its relocation goes into
2178 .rela.got, not .rela.plt. (It's not PLT-specific; not to be
2179 processed as part of the runtime lazy .rela.plt relocation).
2180 FIXME: There be literal constants here... */
2181 bfd_vma rela_plt_index
2185 /* Get the offset into the .got table of the entry that corresponds
2186 to this function. Note that we embed knowledge that "incoming"
2187 .got goes after .got.plt in the output without padding (pointer
2188 aligned). However, that knowledge is present in several other
2189 places too. */
2190 bfd_vma got_offset
2191 = (has_gotplt
2192 ? gotplt_offset
2195 /* This symbol has an entry in the procedure linkage table. Set it
2196 up. */
2209 /* Fill in the entry in the procedure linkage table. */
2211 {
2213 plt_entry_size);
2215 /* We need to enter the absolute address of the GOT entry here. */
2218 }
2219 else
2220 {
2222 plt_entry_size);
2225 }
2227 /* Fill in the plt entry and make a relocation, if this is a "real"
2228 PLT entry. */
2230 {
2231 /* Fill in the offset to the reloc table. */
2236 /* Fill in the offset to the first PLT entry, where to "jump". */
2241 /* Fill in the entry in the global offset table with the address of
2242 the relocating stub. */
2250 /* Fill in the entry in the .rela.plt section. */
2258 }
2261 {
2262 /* Mark the symbol as undefined, rather than as defined in
2263 the .plt section. Leave the value alone. */
2266 /* FIXME: From elf32-sparc.c 2001-02-19 (1.18). I still don't
2267 know whether resetting the value is significant; if it really
2268 is, rather than a quirk or bug in the sparc port, then I
2269 believe we'd see this elsewhere. */
2270 /* If the symbol is weak, we do need to clear the value.
2271 Otherwise, the PLT entry would provide a definition for
2272 the symbol even if the symbol wasn't defined anywhere,
2273 and so the symbol would never be NULL. */
2276 }
2277 }
2279 /* For an ordinary program, we emit .got relocs only for symbols that
2280 are in the dynamic-symbols table and are either defined by the
2281 program or are undefined weak symbols, or are function symbols
2282 where we do not output a PLT: the PLT reloc was output above and all
2283 references to the function symbol are redirected to the PLT. */
2291 {
2294 Elf_Internal_Rela rela;
2298 /* This symbol has an entry in the global offset table. Set it up. */
2308 /* If this is a static link, or it is a -Bsymbolic link and the
2309 symbol is defined locally or was forced to be local because
2310 of a version file, we just want to emit a RELATIVE reloc.
2311 The entry in the global offset table will already have been
2312 initialized in the relocate_section function. */
2318 {
2321 }
2322 else
2323 {
2327 }
2332 }
2335 {
2337 Elf_Internal_Rela rela;
2340 /* This symbol needs a copy reloc. Set it up. */
2357 }
2359 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2365 }
2366 \f
2367 /* Finish up the dynamic sections. Do *not* emit relocs here, as their
2368 offsets were changed, as part of -z combreloc handling, from those we
2369 computed. */
2371 static bfd_boolean
2375 {
2387 {
2397 {
2398 Elf_Internal_Dyn dyn;
2404 {
2416 /* Yes, we *can* have a .plt and no .plt.rela, for instance
2417 if all symbols are found in the .got (not .got.plt). */
2427 else
2433 /* The procedure linkage table relocs (DT_JMPREL) should
2434 not be included in the overall relocs (DT_RELA).
2435 Therefore, we override the DT_RELASZ entry here to
2436 make it not include the JMPREL relocs. Since the
2437 linker script arranges for .rela.plt to follow all
2438 other relocation sections, we don't have to worry
2439 about changing the DT_RELA entry. */
2445 }
2446 }
2448 /* Fill in the first entry in the procedure linkage table. */
2450 {
2452 {
2455 PLT_ENTRY_SIZE_V32);
2456 else
2457 {
2459 PLT_ENTRY_SIZE_V32);
2467 }
2468 }
2469 else
2470 {
2473 PLT_ENTRY_SIZE);
2474 else
2475 {
2477 PLT_ENTRY_SIZE);
2489 }
2490 }
2491 }
2492 }
2494 /* Fill in the first three entries in the global offset table. */
2496 {
2499 else
2505 }
2510 }
2511 \f
2512 /* Return the section that should be marked against GC for a given
2513 relocation. */
2521 {
2525 {
2532 }
2535 }
2537 /* Update the got entry reference counts for the section being removed. */
2539 static bfd_boolean
2544 {
2569 {
2578 {
2583 }
2587 {
2616 }
2619 {
2629 {
2630 /* If the counters are 0 when we got here, we've
2631 miscounted somehow somewhere, an internal error. */
2638 {
2639 /* We don't need the .got entry any more. */
2642 }
2644 }
2646 local_got_reloc:
2648 {
2649 /* If the counters are 0 when we got here, we've
2650 miscounted somehow somewhere, an internal error. */
2657 {
2658 /* We don't need the .got entry any more. */
2662 }
2663 }
2668 /* For local symbols, treat these like GOT relocs. */
2671 /* Fall through. */
2674 /* FIXME: We don't garbage-collect away the .got section. */
2677 /* Fall through. */
2684 {
2688 }
2692 /* This'd be a .dtpreld entry in e.g. debug info. */
2695 /* Fall through. */
2706 }
2707 }
2710 }
2712 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
2713 entry but we found we will not create any. Called when we find we will
2714 not have any PLT for this symbol, by for example
2715 elf_cris_adjust_dynamic_symbol when we're doing a proper dynamic link,
2716 or elf_cris_size_dynamic_sections if no dynamic sections will be
2717 created (we're only linking static objects). */
2719 static bfd_boolean
2722 PTR p;
2723 {
2729 /* If nobody wanted a GOTPLT with this symbol, we're done. */
2734 {
2735 /* There's a GOT entry for this symbol. Just adjust the refcounts.
2736 Probably not necessary at this stage, but keeping them accurate
2737 helps avoiding surprises later. */
2741 }
2742 else
2743 {
2744 /* No GOT entry for this symbol. We need to create one. */
2753 /* Put accurate refcounts there. */
2759 /* We always have a .got and a .rela.got section if there were
2760 GOTPLT relocs in input. */
2763 /* Allocate space in the .got section. */
2766 /* Allocate relocation space. */
2768 }
2771 }
2773 /* Try to fold PLT entries with GOT entries. There are two cases when we
2774 want to do this:
2776 - When all PLT references are GOTPLT references, and there are GOT
2777 references, and this is not the executable. We don't have to
2778 generate a PLT at all.
2780 - When there are both (ordinary) PLT references and GOT references,
2781 and this isn't the executable.
2782 We want to make the PLT reference use the ordinary GOT entry rather
2783 than R_CRIS_JUMP_SLOT, a run-time dynamically resolved GOTPLT entry,
2784 since the GOT entry will have to be resolved at startup anyway.
2786 Though the latter case is handled when room for the PLT is allocated,
2787 not here.
2789 By folding into the GOT, we may need a round-trip to a PLT in the
2790 executable for calls, a loss in performance. Still, losing a
2791 reloc is a win in size and at least in start-up time.
2793 Note that this function is called before symbols are forced local by
2794 version scripts. The differing cases are handled by
2795 elf_cris_hide_symbol. */
2797 static bfd_boolean
2800 PTR p;
2801 {
2804 /* If there are no GOT references for this symbol, we can't fold any
2805 other reference so there's nothing to do. Likewise if there are no
2806 PLT references; GOTPLT references included. */
2810 /* GOTPLT relocs are supposed to be included into the PLT refcount. */
2814 {
2815 /* The only PLT references are GOTPLT references, and there are GOT
2816 references. Convert PLT to GOT references. */
2820 /* Clear the PLT references, so no PLT will be created. */
2822 }
2825 }
2827 /* Our own version of hide_symbol, so that we can adjust a GOTPLT reloc
2828 to use a GOT entry (and create one) rather than requiring a GOTPLT
2829 entry. */
2831 static void
2835 bfd_boolean force_local;
2836 {
2840 }
2842 /* Adjust a symbol defined by a dynamic object and referenced by a
2843 regular object. The current definition is in some section of the
2844 dynamic object, but we're not including those sections. We have to
2845 change the definition to something the rest of the link can
2846 understand. */
2848 static bfd_boolean
2852 {
2855 bfd_size_type plt_entry_size;
2859 /* Make sure we know what is going on here. */
2867 plt_entry_size
2871 /* If this is a function, put it in the procedure linkage table. We
2872 will fill in the contents of the procedure linkage table later,
2873 when we know the address of the .got section. */
2876 {
2877 /* If we link a program (not a DSO), we'll get rid of unnecessary
2878 PLT entries; we point to the actual symbols -- even for pic
2879 relocs, because a program built with -fpic should have the same
2880 result as one built without -fpic, specifically considering weak
2881 symbols.
2882 FIXME: m68k and i386 differ here, for unclear reasons. */
2885 {
2886 /* This case can occur if we saw a PLT reloc in an input file,
2887 but the symbol was not defined by a dynamic object. In such
2888 a case, we don't actually need to build a procedure linkage
2889 table, and we can just do an absolute or PC reloc instead, or
2890 change a .got.plt index to a .got index for GOTPLT relocs. */
2894 return
2897 info);
2898 }
2900 /* If we had a R_CRIS_GLOB_DAT that didn't have to point to a PLT;
2901 where a pointer-equivalent symbol was unimportant (i.e. more
2902 like R_CRIS_JUMP_SLOT after symbol evaluation) we could get rid
2903 of the PLT. We can't for the executable, because the GOT
2904 entries will point to the PLT there (and be constant). */
2910 /* GC or folding may have rendered this entry unused. */
2912 {
2916 }
2918 /* Make sure this symbol is output as a dynamic symbol. */
2920 {
2923 }
2928 /* If this is the first .plt entry, make room for the special
2929 first entry. */
2933 /* If this symbol is not defined in a regular file, and we are
2934 not generating a shared library, then set the symbol to this
2935 location in the .plt. */
2938 {
2941 }
2943 /* If there's already a GOT entry, use that, not a .got.plt. A
2944 GOT field still has a reference count when we get here; it's
2945 not yet changed to an offset. We can't do this for an
2946 executable, because then the reloc associated with the PLT
2947 would get a non-PLT reloc pointing to the PLT. FIXME: Move
2948 this to elf_cris_try_fold_plt_to_got. */
2950 {
2953 /* Mark the PLT offset to use the GOT entry by setting the low
2954 bit in the plt offset; it is always a multiple of
2955 plt_entry_size (which is at least a multiple of 2). */
2958 /* Change the PLT refcount to an offset. */
2961 /* By not setting gotplt_offset (i.e. it remains at 0), we signal
2962 that the got entry should be used instead. */
2966 /* Make room for this entry. */
2970 }
2972 /* No GOT reference for this symbol; prepare for an ordinary PLT. */
2975 /* Make room for this entry. */
2978 /* We also need to make an entry in the .got.plt section, which
2979 will be placed in the .got section by the linker script. */
2988 /* We also need to make an entry in the .rela.plt section. */
2995 }
2997 /* Reinitialize the plt offset now that it is not used as a reference
2998 count any more. */
3001 /* If this is a weak symbol, and there is a real definition, the
3002 processor independent code will have arranged for us to see the
3003 real definition first, and we can just use the same value. */
3005 {
3011 }
3013 /* This is a reference to a symbol defined by a dynamic object which
3014 is not a function. */
3016 /* If we are creating a shared library, we must presume that the
3017 only references to the symbol are via the global offset table.
3018 For such cases we need not do anything here; the relocations will
3019 be handled correctly by relocate_section. */
3023 /* If there are no references to this symbol that do not use the
3024 GOT, we don't need to generate a copy reloc. */
3029 {
3033 }
3035 /* We must allocate the symbol in our .dynbss section, which will
3036 become part of the .bss section of the executable. There will be
3037 an entry for this symbol in the .dynsym section. The dynamic
3038 object will contain position independent code, so all references
3039 from the dynamic object to this symbol will go through the global
3040 offset table. The dynamic linker will use the .dynsym entry to
3041 determine the address it must put in the global offset table, so
3042 both the dynamic object and the regular object will refer to the
3043 same memory location for the variable. */
3048 /* We must generate a R_CRIS_COPY reloc to tell the dynamic linker to
3049 copy the initial value out of the dynamic object and into the
3050 runtime process image. We need to remember the offset into the
3051 .rela.bss section we are going to use. */
3053 {
3060 }
3063 }
3065 /* Adjust our "subclass" elements for an indirect symbol. */
3067 static void
3071 {
3077 /* Only indirect symbols are replaced; we're not interested in
3078 updating any of EIND's fields for other symbols. */
3080 {
3081 /* Still, we need to copy flags for e.g. weak definitions. */
3084 }
3089 #define XMOVOPZ(F, OP, Z) edir->F OP eind->F; eind->F = Z
3090 #define XMOVE(F) XMOVOPZ (F, +=, 0)
3097 #undef XMOVE
3098 #undef XMOVOPZ
3101 }
3103 /* Look through the relocs for a section during the first phase. */
3105 static bfd_boolean
3111 {
3136 {
3145 {
3148 }
3149 else
3150 {
3155 }
3159 /* Some relocs require linker-created sections; we need to hang them
3160 on the first input bfd we found that contained dynamic relocs. */
3162 {
3165 /* This'd be a .dtpreld entry in e.g. debug info. We have
3166 several different switch statements below, but none of
3167 that is needed; we need no preparations for resolving
3168 R_CRIS_32_DTPREL into a non-allocated section (debug
3169 info), so let's just move on to the next
3170 relocation. */
3172 /* Fall through. */
3174 /* The first .got.plt entry is right after the R_CRIS_DTPMOD
3175 entry at index 3. */
3179 /* Fall through. */
3195 {
3198 /* We could handle this if we can get a handle on the
3199 output bfd in elf_cris_adjust_dynamic_symbol. Failing
3200 that, we must insist on dynobj being a specific mach. */
3202 {
3208 }
3210 /* Create the .got section, so we can assume it's always
3211 present whenever there's a dynobj. */
3214 }
3220 {
3221 bfd_size_type amt;
3223 /* We use index local_got_refcounts[-1] to count all
3224 GOT-relative relocations that do not have explicit
3225 GOT entries. */
3232 local_got_refcounts++;
3234 }
3239 }
3241 /* Some relocs require a global offset table (but perhaps not a
3242 specific GOT entry). */
3244 {
3247 /* Not requesting .got.rela for an executable: the contents
3248 of the first entry is constant there. For a shared
3249 library, we need .got.rela for the R_CRIS_DTPMOD
3250 relocation at index 3. */
3253 /* Fall through. */
3261 /* Fall through. */
3263 /* For R_CRIS_16_GOTPLT and R_CRIS_32_GOTPLT, we need a GOT
3264 entry only for local symbols. Unfortunately, we don't know
3265 until later on if there's a version script that forces the
3266 symbol local. We must have the .rela.got section in place
3267 before we know if the symbol looks global now, so we need
3268 to treat the reloc just like for R_CRIS_16_GOT and
3269 R_CRIS_32_GOT. */
3276 {
3279 {
3282 (SEC_ALLOC
3283 | SEC_LOAD
3284 | SEC_HAS_CONTENTS
3285 | SEC_IN_MEMORY
3286 | SEC_LINKER_CREATED
3291 }
3292 }
3297 }
3299 /* Warn and error for invalid input. */
3301 {
3307 {
3310 " in a shared object;"
3312 abfd,
3313 sec,
3315 /* Don't return FALSE here; we want messages for all of
3316 these and the error behavior is ungraceful
3317 anyway. */
3318 }
3321 }
3324 {
3328 /* These are requests for tls_index entries, run-time R_CRIS_DTP. */
3335 /* These two just request for the constant-index
3336 module-local tls_index-sized GOT entry, which we add
3337 elsewhere. */
3345 /* Those relocs also require that a DSO is of type
3346 Initial Exec. Like other targets, we don't reset this
3347 flag even if the relocs are GC:ed away. */
3352 /* Let's list the other assembler-generated TLS-relocs too,
3353 just to show that they're not forgotten. */
3358 }
3361 {
3364 /* Mark that we need a GOT entry if the PLT entry (and its GOT
3365 entry) is eliminated. We can only do this for a non-local
3366 symbol. */
3368 {
3371 }
3372 /* If h is NULL then this is a local symbol, and we must make a
3373 GOT entry for it, so handle it like a GOT reloc. */
3374 /* Fall through. */
3384 /* This symbol requires a global offset table entry. */
3386 {
3388 {
3389 /* Make sure this symbol is output as a dynamic symbol. */
3391 {
3394 }
3395 }
3397 /* Update the sum of reloc counts for this symbol. */
3401 {
3405 {
3406 /* Allocate space in the .got section. */
3408 /* Allocate relocation space. */
3410 }
3418 {
3419 /* Allocate space in the .got section. */
3421 /* Allocate relocation space. */
3423 }
3431 {
3432 /* Allocate space in the .got section. */
3434 /* Allocate relocation space. */
3436 }
3443 }
3444 }
3445 else
3446 {
3447 /* This is a global offset table entry for a local symbol. */
3449 {
3452 {
3453 /* If we are generating a shared object, we need
3454 to output a R_CRIS_RELATIVE reloc so that the
3455 dynamic linker can adjust this GOT entry.
3456 Similarly for non-regular got entries. */
3458 }
3459 }
3460 /* Update the reloc-specific count. */
3463 /* This one is the sum of all the others. */
3465 }
3471 /* This reference requires a global offset table.
3472 FIXME: The actual refcount isn't used currently; the .got
3473 section can't be removed if there were any references in the
3474 input. */
3478 handle_gotplt_reloc:
3481 /* This reference requires a global offset table. */
3483 /* Fall through. */
3486 /* This symbol requires a procedure linkage table entry. We
3487 actually build the entry in adjust_dynamic_symbol,
3488 because this might be a case of linking PIC code which is
3489 never referenced by a dynamic object, in which case we
3490 don't need to generate a procedure linkage table entry
3491 after all. */
3493 /* Beware: if we'd check for visibility of the symbol here
3494 (and not marking the need for a PLT when non-visible), we'd
3495 get into trouble with keeping handling consistent with
3496 regards to relocs found before definition and GOTPLT
3497 handling. Eliminable PLT entries will be dealt with later
3498 anyway. */
3509 /* Let's help debug shared library creation. Any of these
3510 relocs *can* be used in shared libs, but pages containing
3511 them cannot be shared, so they're not appropriate for
3512 common use. Don't warn for sections we don't care about,
3513 such as debug sections or non-constant sections. We
3514 can't help tables of (global) function pointers, for
3515 example, though they must be emitted in a (writable) data
3516 section to avoid having impure text sections. */
3520 {
3521 /* FIXME: How do we make this optionally a warning only? */
3525 abfd,
3526 sec,
3528 }
3530 {
3533 /* Make sure a plt entry is created for this symbol if it
3534 turns out to be a function defined by a dynamic object. */
3537 }
3539 /* If we are creating a shared library and this is not a local
3540 symbol, we need to copy the reloc into the shared library.
3541 However when linking with -Bsymbolic and this is a global
3542 symbol which is defined in an object we are including in the
3543 link (i.e., DEF_REGULAR is set), then we can resolve the
3544 reloc directly. At this point we have not seen all the input
3545 files, so it is possible that DEF_REGULAR is not set now but
3546 will be set later (it is never cleared). In case of a weak
3547 definition, DEF_REGULAR may be cleared later by a strong
3548 definition in a shared library. We account for that
3549 possibility below by storing information in the relocs_copied
3550 field of the hash table entry. A similar situation occurs
3551 when creating shared libraries and symbol visibility changes
3552 render the symbol local. */
3554 /* No need to do anything if we're not creating a shared object. */
3558 /* We don't need to handle relocs into sections not going into
3559 the "real" output. */
3563 /* We may need to create a reloc section in the dynobj and made room
3564 for this reloc. */
3566 {
3567 sreloc = _bfd_elf_make_dynamic_reloc_section
3572 }
3584 {
3587 /* Make sure a plt entry is created for this symbol if it
3588 turns out to be a function defined by a dynamic object. */
3591 }
3593 /* If we are creating a shared library and this is not a local
3594 symbol, we need to copy the reloc into the shared library.
3595 However when linking with -Bsymbolic and this is a global
3596 symbol which is defined in an object we are including in the
3597 link (i.e., DEF_REGULAR is set), then we can resolve the
3598 reloc directly. At this point we have not seen all the input
3599 files, so it is possible that DEF_REGULAR is not set now but
3600 will be set later (it is never cleared). In case of a weak
3601 definition, DEF_REGULAR may be cleared later by a strong
3602 definition in a shared library. We account for that
3603 possibility below by storing information in the relocs_copied
3604 field of the hash table entry. A similar situation occurs
3605 when creating shared libraries and symbol visibility changes
3606 render the symbol local. */
3608 /* No need to do anything if we're not creating a shared object. */
3612 /* We don't need to handle relocs into sections not going into
3613 the "real" output. */
3617 /* If the symbol is local, then we know already we can
3618 eliminate the reloc. */
3622 /* If this is with -Bsymbolic and the symbol isn't weak, and
3623 is defined by an ordinary object (the ones we include in
3624 this shared library) then we can also eliminate the
3625 reloc. See comment above for more eliminable cases which
3626 we can't identify at this time. */
3632 /* We may need to create a reloc section in the dynobj and made room
3633 for this reloc. */
3635 {
3636 sreloc = _bfd_elf_make_dynamic_reloc_section
3641 }
3645 /* We count the number of PC relative relocations we have
3646 entered for this symbol, so that we can discard them
3647 again if the symbol is later defined by a regular object.
3648 We know that h is really a pointer to an
3649 elf_cris_link_hash_entry. */
3650 {
3661 {
3671 }
3674 }
3677 /* This relocation describes the C++ object vtable hierarchy.
3678 Reconstruct it for later use during GC. */
3684 /* This relocation describes which C++ vtable entries are actually
3685 used. Record for later use during GC. */
3695 /* Already warned above, when necessary. */
3699 /* Other relocs do not appear here. */
3702 }
3703 }
3706 }
3708 /* Set the sizes of the dynamic sections. */
3710 static bfd_boolean
3714 {
3717 bfd_boolean plt;
3718 bfd_boolean relocs;
3724 {
3725 /* Set the contents of the .interp section to the interpreter. */
3727 {
3732 }
3733 }
3734 else
3735 {
3736 /* Adjust all expected GOTPLT uses to use a GOT entry instead. */
3738 elf_cris_adjust_gotplt_to_got,
3741 /* We may have created entries in the .rela.got section.
3742 However, if we are not creating the dynamic sections, we will
3743 not actually use these entries. Reset the size of .rela.got,
3744 which will cause it to get stripped from the output file
3745 below. */
3749 }
3751 /* If this is a -Bsymbolic shared link, then we need to discard all PC
3752 relative relocs against symbols defined in a regular object. We
3753 allocated space for them in the check_relocs routine, but we will not
3754 fill them in in the relocate_section routine. We also discard space
3755 for relocs that have become for local symbols due to symbol
3756 visibility changes. For programs, we discard space for relocs for
3757 symbols not referenced by any dynamic object. */
3760 elf_cris_discard_excess_dso_dynamics,
3762 else
3764 elf_cris_discard_excess_program_dynamics,
3767 /* The check_relocs and adjust_dynamic_symbol entry points have
3768 determined the sizes of the various dynamic sections. Allocate
3769 memory for them. */
3773 {
3779 /* It's OK to base decisions on the section name, because none
3780 of the dynobj section names depend upon the input files. */
3784 {
3785 /* Remember whether there is a PLT. */
3787 }
3789 {
3790 /* The .got.plt contains the .got header as well as the
3791 actual .got.plt contents. The .got header may contain a
3792 R_CRIS_DTPMOD entry at index 3. */
3795 }
3797 {
3804 {
3805 /* Remember whether there are any reloc sections other
3806 than .rela.plt. */
3810 /* We use the reloc_count field as a counter if we need
3811 to copy relocs into the output file. */
3813 }
3814 }
3817 {
3818 /* It's not one of our sections, so don't allocate space. */
3820 }
3823 {
3824 /* If we don't need this section, strip it from the
3825 output file. This is mostly to handle .rela.bss and
3826 .rela.plt. We must create both sections in
3827 create_dynamic_sections, because they must be created
3828 before the linker maps input sections to output
3829 sections. The linker does that before
3830 adjust_dynamic_symbol is called, and it is that
3831 function which decides whether anything needs to go
3832 into these sections. */
3835 }
3840 /* Allocate memory for the section contents. We use bfd_zalloc here
3841 in case unused entries are not reclaimed before the section's
3842 contents are written out. This should not happen, but this way
3843 if it does, we will not write out garbage. For reloc sections,
3844 this will make entries have the type R_CRIS_NONE. */
3848 }
3851 {
3852 /* Add some entries to the .dynamic section. We fill in the
3853 values later, in elf_cris_finish_dynamic_sections, but we
3854 must add the entries now so that we get the correct size for
3855 the .dynamic section. The DT_DEBUG entry is filled in by the
3856 dynamic linker and used by the debugger. */
3857 #define add_dynamic_entry(TAG, VAL) \
3858 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3861 {
3864 }
3867 {
3873 }
3876 {
3881 }
3884 {
3888 }
3889 }
3890 #undef add_dynamic_entry
3893 }
3895 /* This function is called via elf_cris_link_hash_traverse if we are
3896 creating a shared object. In the -Bsymbolic case, it discards the
3897 space allocated to copy PC relative relocs against symbols which
3898 are defined in regular objects. For the normal non-symbolic case,
3899 we also discard space for relocs that have become local due to
3900 symbol visibility changes. We allocated space for them in the
3901 check_relocs routine, but we won't fill them in in the
3902 relocate_section routine. */
3904 static bfd_boolean
3907 PTR inf;
3908 {
3915 /* If a symbol has been forced local or we have found a regular
3916 definition for the symbolic link case, then we won't be needing
3917 any relocs. */
3921 {
3926 }
3928 /* If we have accounted for PC-relative relocs for read-only
3929 sections, now is the time to warn for them. We can't do it in
3930 cris_elf_check_relocs, because we don't know the status of all
3931 symbols at that time (and it's common to force symbols local
3932 late). */
3935 {
3938 /* FIXME: How do we make this optionally a warning only? */
3941 " relocation %s should not be used"
3949 }
3952 }
3954 /* This function is called via elf_cris_link_hash_traverse if we are *not*
3955 creating a shared object. We discard space for relocs for symbols put
3956 in the .got, but which we found we do not have to resolve at run-time. */
3958 static bfd_boolean
3961 PTR inf;
3962 {
3968 /* If we're not creating a shared library and have a symbol which is
3969 referred to by .got references, but the symbol is defined locally,
3970 (or rather, not defined by a DSO) then lose the reloc for the .got
3971 (don't allocate room for it). Likewise for relocs for something
3972 for which we create a PLT. */
3975 {
3977 /* The size of this section is only valid and in sync with the
3978 various reference counts if we do dynamic; don't decrement it
3979 otherwise. */
3981 {
3992 }
3994 /* If the locally-defined symbol isn't used by a DSO, then we don't
3995 have to export it as a dynamic symbol. This was already done for
3996 functions; doing this for all symbols would presumably not
3997 introduce new problems. Of course we don't do this if we're
3998 exporting all dynamic symbols. */
4003 {
4007 }
4008 }
4011 }
4013 /* Reject a file depending on presence and expectation of prefixed
4014 underscores on symbols. */
4016 static bfd_boolean
4019 {
4025 else
4027 }
4029 /* Mark presence or absence of leading underscore. Set machine type
4030 flags from mach type. */
4032 static void
4035 bfd_boolean linker ATTRIBUTE_UNUSED;
4036 {
4044 {
4060 }
4063 }
4065 /* Set the mach type from e_flags value. */
4067 static bfd_boolean
4071 {
4073 {
4087 /* Since we don't recognize them, we obviously can't support them
4088 with this code; we'd have to require that all future handling
4089 would be optional. */
4092 }
4095 }
4097 /* Display the flags field. */
4099 static bfd_boolean
4102 PTR ptr;
4103 {
4123 }
4125 /* Don't mix files with and without a leading underscore. */
4127 static bfd_boolean
4131 {
4144 {
4145 /* This happens when ld starts out with a 'blank' output file. */
4148 /* We ignore the linker-set mach, and instead set it according to
4149 the first input file. This would also happen if we could
4150 somehow filter out the OUTPUT_ARCH () setting from elf.sc.
4151 This allows us to keep the same linker config across
4152 cris(v0..v10) and crisv32. The drawback is that we can't force
4153 the output type, which might be a sane thing to do for a
4154 v10+v32 compatibility object. */
4157 }
4161 {
4166 ibfd);
4169 }
4174 {
4175 /* We can get an incompatible combination only if either is
4176 bfd_mach_cris_v32, and the other one isn't compatible. */
4181 {
4188 ibfd);
4191 }
4193 /* We don't have to check the case where the input is compatible
4194 with v10 and v32, because the output is already known to be set
4195 to the other (compatible) mach. */
4199 }
4202 }
4204 /* Do side-effects of e_flags copying to obfd. */
4206 static bfd_boolean
4210 {
4211 /* Call the base function. */
4215 /* If output is big-endian for some obscure reason, stop here. */
4223 /* Do what we really came here for. */
4225 }
4227 static enum elf_reloc_type_class
4230 {
4233 {
4242 }
4243 }
4245 /* The elf_backend_got_elt_size worker. For one symbol, we can have up to
4246 two GOT entries from three types with two different sizes. We handle
4247 it as a single entry, so we can use the regular offset-calculation
4248 machinery. */
4250 static bfd_vma
4256 {
4260 /* We may have one regular GOT entry or up to two TLS GOT
4261 entries. */
4263 {
4270 {
4271 /* We can't have a variable referred to both as a regular
4272 variable and through TLS relocs. */
4276 }
4283 }
4284 else
4285 {
4288 {
4289 /* The actual error-on-input is emitted elsewhere. */
4292 }
4299 }
4301 /* We're only called when h->got.refcount is non-zero, so we must
4302 have a non-zero size. */
4305 }
4306 \f
4307 #define ELF_ARCH bfd_arch_cris
4308 #define ELF_MACHINE_CODE EM_CRIS
4309 #define ELF_MAXPAGESIZE 0x2000
4311 #define TARGET_LITTLE_SYM bfd_elf32_cris_vec
4313 #define elf_symbol_leading_char 0
4315 #define elf_info_to_howto_rel NULL
4316 #define elf_info_to_howto cris_info_to_howto_rela
4317 #define elf_backend_relocate_section cris_elf_relocate_section
4318 #define elf_backend_gc_mark_hook cris_elf_gc_mark_hook
4319 #define elf_backend_gc_sweep_hook cris_elf_gc_sweep_hook
4320 #define elf_backend_check_relocs cris_elf_check_relocs
4321 #define elf_backend_grok_prstatus cris_elf_grok_prstatus
4322 #define elf_backend_grok_psinfo cris_elf_grok_psinfo
4324 #define elf_backend_can_gc_sections 1
4325 #define elf_backend_can_refcount 1
4327 #define elf_backend_object_p cris_elf_object_p
4328 #define elf_backend_final_write_processing \
4329 cris_elf_final_write_processing
4330 #define bfd_elf32_bfd_print_private_bfd_data \
4331 cris_elf_print_private_bfd_data
4332 #define bfd_elf32_bfd_merge_private_bfd_data \
4333 cris_elf_merge_private_bfd_data
4334 #define bfd_elf32_bfd_copy_private_bfd_data \
4335 cris_elf_copy_private_bfd_data
4337 #define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup
4338 #define bfd_elf32_bfd_reloc_name_lookup cris_reloc_name_lookup
4340 #define bfd_elf32_bfd_link_hash_table_create \
4341 elf_cris_link_hash_table_create
4342 #define elf_backend_adjust_dynamic_symbol \
4343 elf_cris_adjust_dynamic_symbol
4344 #define elf_backend_copy_indirect_symbol \
4345 elf_cris_copy_indirect_symbol
4346 #define elf_backend_size_dynamic_sections \
4347 elf_cris_size_dynamic_sections
4348 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4349 #define elf_backend_finish_dynamic_symbol \
4350 elf_cris_finish_dynamic_symbol
4351 #define elf_backend_finish_dynamic_sections \
4352 elf_cris_finish_dynamic_sections
4353 #define elf_backend_create_dynamic_sections \
4354 _bfd_elf_create_dynamic_sections
4355 #define bfd_elf32_bfd_final_link \
4356 bfd_elf_gc_common_final_link
4357 #define elf_backend_hide_symbol elf_cris_hide_symbol
4358 #define elf_backend_reloc_type_class elf_cris_reloc_type_class
4360 #define elf_backend_want_got_plt 1
4361 #define elf_backend_plt_readonly 1
4362 #define elf_backend_want_plt_sym 0
4363 #define elf_backend_got_header_size 12
4364 #define elf_backend_got_elt_size elf_cris_got_elt_size
4366 /* Later, we my want to optimize RELA entries into REL entries for dynamic
4367 linking and libraries (if it's a win of any significance). Until then,
4368 take the easy route. */
4369 #define elf_backend_may_use_rel_p 0
4370 #define elf_backend_may_use_rela_p 1
4371 #define elf_backend_rela_normal 1
4375 #undef TARGET_LITTLE_SYM
4376 #undef TARGET_LITTLE_NAME
4377 #undef elf_symbol_leading_char
4379 #define TARGET_LITTLE_SYM bfd_elf32_us_cris_vec
4382 #undef elf32_bed
4383 #define elf32_bed elf32_us_cris_bed