| blob | 72916f2aa70eed7e8991ee25e23c59f07937a925 |
1 /* CRIS-specific support for 32-bit ELF.
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
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)
440 };
441 \f
442 /* Map BFD reloc types to CRIS ELF reloc types. */
444 struct cris_reloc_map
445 {
446 bfd_reloc_code_real_type bfd_reloc_val;
448 };
451 {
483 };
488 bfd_reloc_code_real_type code;
489 {
497 }
501 {
506 i++)
512 }
514 /* Set the howto pointer for an CRIS ELF reloc. */
516 static void
521 {
527 }
529 bfd_reloc_status_type
535 PTR data ATTRIBUTE_UNUSED;
539 {
540 /* By default (using only bfd_elf_generic_reloc when linking to
541 non-ELF formats) PC-relative relocs are relative to the beginning
542 of the reloc. CRIS PC-relative relocs are relative to the position
543 *after* the reloc because that's what pre-CRISv32 PC points to
544 after reading an insn field with that reloc. (For CRISv32, PC is
545 actually relative to the start of the insn, but we keep the old
546 definition.) Still, we use as much generic machinery as we can.
548 Only adjust when doing a final link. */
552 return
555 }
556 \f
557 /* Support for core dump NOTE sections.
558 The slightly unintuitive code layout is an attempt to keep at least
559 some similarities with other ports, hoping to simplify general
560 changes, while still keeping Linux/CRIS and Linux/CRISv32 code apart. */
562 static bfd_boolean
566 {
572 {
577 /* pr_cursig */
580 /* pr_pid */
583 /* pr_reg */
588 }
589 else
591 {
596 /* pr_cursig */
599 /* pr_pid */
602 /* pr_reg */
607 }
609 /* Make a ".reg/999" section. */
612 }
614 static bfd_boolean
618 {
621 {
630 }
631 else
633 {
642 }
644 /* Note that for some reason, a spurious space is tacked
645 onto the end of the args in some (at least one anyway)
646 implementations, so strip it off if it exists. */
648 {
654 }
657 }
658 \f
659 /* The name of the dynamic interpreter. This is put in the .interp
660 section. */
664 /* The size in bytes of an entry in the procedure linkage table. */
666 #define PLT_ENTRY_SIZE 20
667 #define PLT_ENTRY_SIZE_V32 26
669 /* The first entry in an absolute procedure linkage table looks like this. */
672 {
681 };
684 {
695 };
697 /* Subsequent entries in an absolute procedure linkage table look like
698 this. */
701 {
710 };
713 {
724 };
726 /* The first entry in a PIC procedure linkage table looks like this. */
729 {
734 };
737 {
749 };
751 /* Subsequent entries in a PIC procedure linkage table look like this. */
754 {
763 };
766 {
777 };
778 \f
779 /* We copy elf32-m68k.c and elf32-i386.c for the basic linker hash bits
780 (and most other PIC/shlib stuff). Check that we don't drift away
781 without reason.
783 The CRIS linker, like the m68k and i386 linkers (and probably the rest
784 too) needs to keep track of the number of relocs that it decides to
785 copy in check_relocs for each symbol. This is so that it can discard
786 PC relative relocs if it doesn't need them when linking with
787 -Bsymbolic. We store the information in a field extending the regular
788 ELF linker hash table. */
790 /* This structure keeps track of the number of PC relative relocs we have
791 copied for a given symbol. */
793 struct elf_cris_pcrel_relocs_copied
794 {
795 /* Next section. */
797 /* A section in dynobj. */
799 /* Number of relocs copied in this section. */
800 bfd_size_type count;
801 };
803 /* CRIS ELF linker hash entry. */
805 struct elf_cris_link_hash_entry
806 {
809 /* Number of PC relative relocs copied for this symbol. */
812 /* The GOTPLT references are CRIS-specific; the goal is to avoid having
813 both a general GOT and a PLT-specific GOT entry for the same symbol,
814 when it is referenced both as a function and as a function pointer.
816 Number of GOTPLT references for a function. */
817 bfd_signed_vma gotplt_refcount;
819 /* Actual GOTPLT index for this symbol, if applicable, or zero if not
820 (zero is never used as an index). FIXME: We should be able to fold
821 this with gotplt_refcount in a union, like the got and plt unions in
822 elf_link_hash_entry. */
823 bfd_size_type gotplt_offset;
825 /* The root.got.refcount is the sum of the regular reference counts
826 (this) and those members below. We have to keep a separate count
827 to track when we've found the first (or last) reference to a
828 regular got entry. The offset is in root.got.offset. */
829 bfd_signed_vma reg_got_refcount;
831 /* Similar to the above, the number of reloc references to this
832 symbols that need a R_CRIS_32_TPREL slot. The offset is in
833 root.got.offset, because this and .dtp_refcount can't validly
834 happen when there's also a regular GOT entry; that's invalid
835 input for which an error is emitted. */
836 bfd_signed_vma tprel_refcount;
838 /* Similar to the above, the number of reloc references to this
839 symbols that need a R_CRIS_DTP slot. The offset is in
840 root.got.offset; plus 4 if .tprel_refcount > 0. */
841 bfd_signed_vma dtp_refcount;
842 };
844 /* The local_got_refcounts and local_got_offsets are a multiple of
845 LSNUM in size, namely LGOT_ALLOC_NELTS_FOR(LSNUM) (plus one for the
846 refcount for GOT itself, see code), with the summary / group offset
847 for local symbols located at offset N, reference counts for
848 ordinary (address) relocs at offset N + LSNUM, for R_CRIS_DTP
849 relocs at offset N + 2*LSNUM, and for R_CRIS_32_TPREL relocs at N +
850 3*LSNUM. */
852 #define LGOT_REG_NDX(x) ((x) + symtab_hdr->sh_info)
853 #define LGOT_DTP_NDX(x) ((x) + 2 * symtab_hdr->sh_info)
854 #define LGOT_TPREL_NDX(x) ((x) + 3 * symtab_hdr->sh_info)
855 #define LGOT_ALLOC_NELTS_FOR(x) ((x) * 4)
857 /* CRIS ELF linker hash table. */
859 struct elf_cris_link_hash_table
860 {
863 /* We can't use the PLT offset and calculate to get the GOTPLT offset,
864 since we try and avoid creating GOTPLT:s when there's already a GOT.
865 Instead, we keep and update the next available index here. */
866 bfd_size_type next_gotplt_entry;
868 /* The number of R_CRIS_32_DTPREL and R_CRIS_16_DTPREL that have
869 been seen for any input; if != 0, then the constant-offset
870 R_CRIS_DTPMOD is needed for this DSO/executable. This turns
871 negative at relocation, so that we don't need an extra flag for
872 when the reloc is output. */
873 bfd_signed_vma dtpmod_refcount;
874 };
876 /* Traverse a CRIS ELF linker hash table. */
878 #define elf_cris_link_hash_traverse(table, func, info) \
879 (elf_link_hash_traverse \
880 (&(table)->root, \
881 (bfd_boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
882 (info)))
884 /* Get the CRIS ELF linker hash table from a link_info structure. */
886 #define elf_cris_hash_table(p) \
887 ((struct elf_cris_link_hash_table *) (p)->hash)
889 /* Get the CRIS ELF linker hash entry from a regular hash entry (the
890 "parent class"). The .root reference is just a simple type
891 check on the argument. */
893 #define elf_cris_hash_entry(p) \
894 ((struct elf_cris_link_hash_entry *) (&(p)->root))
896 /* Create an entry in a CRIS ELF linker hash table. */
903 {
907 /* Allocate the structure if it has not already been allocated by a
908 subclass. */
916 /* Call the allocation method of the superclass. */
921 {
928 }
931 }
933 /* Create a CRIS ELF linker hash table. */
938 {
947 elf_cris_link_hash_newfunc,
949 {
952 }
954 /* Initialize to skip over the first three entries in the gotplt; they
955 are used for run-time symbol evaluation. */
958 /* We haven't seen any R_CRIS_nn_GOT_TPREL initially. */
962 }
963 \f
964 /* Perform a single relocation. By default we use the standard BFD
965 routines, with a few tweaks. */
967 static bfd_reloc_status_type
969 relocation)
975 bfd_vma relocation;
976 {
977 bfd_reloc_status_type r;
980 /* PC-relative relocations are relative to the position *after*
981 the reloc. Note that for R_CRIS_8_PCREL the adjustment is
982 not a single byte, since PC must be 16-bit-aligned. */
984 {
985 /* Check that the 16-bit GOT relocs are positive. */
995 /* Fall through. */
1003 }
1009 }
1010 \f
1012 /* The number of errors left before we stop outputting reloc-specific
1013 explanatory messages. By coincidence, this works nicely together
1014 with the default number of messages you'll get from LD about
1015 "relocation truncated to fit" messages before you get an
1016 "additional relocation overflows omitted from the output". */
1019 /* Relocate an CRIS ELF section. See elf32-fr30.c, from where this was
1020 copied, for further comments. */
1022 static bfd_boolean
1033 {
1057 {
1060 }
1063 {
1069 bfd_vma relocation;
1070 bfd_reloc_status_type r;
1087 {
1092 symname = (bfd_elf_string_from_elf_section
1096 }
1097 else
1098 {
1099 bfd_boolean warned;
1100 bfd_boolean unresolved_reloc;
1110 /* Perhaps we should detect the cases that
1111 sec->output_section is expected to be NULL like i386 and
1112 m68k, but apparently (and according to elfxx-ia64.c) all
1113 valid cases are where the symbol is defined in a shared
1114 object which we link dynamically against. This includes
1115 PLT relocs for which we've created a PLT entry and other
1116 relocs for which we're prepared to create dynamic
1117 relocations.
1119 For now, new situations cause us to just err when
1120 sec->output_offset is NULL but the object with the symbol
1121 is *not* dynamically linked against. Thus this will
1122 automatically remind us so we can see if there are other
1123 valid cases we need to revisit. */
1129 {
1130 /* Here follow the cases where the relocation value must
1131 be zero (or when further handling is simplified when
1132 zero). I can't claim to understand the various
1133 conditions and they weren't described in the files
1134 where I copied them from (elf32-m68k.c and
1135 elf32-i386.c), but let's mention examples of where
1136 they happen. FIXME: Perhaps define and use a
1137 dynamic_symbol_p function like ia64.
1139 - When creating a shared library, we can have an
1140 ordinary relocation for a symbol defined in a shared
1141 library (perhaps the one we create). We then make
1142 the relocation value zero, as the value seen now will
1143 be added into the relocation addend in this shared
1144 library, but must be handled only at dynamic-link
1145 time. FIXME: Not sure this example covers the
1146 h->elf_link_hash_flags test, though it's there in
1147 other targets. */
1160 {
1161 _bfd_error_handler
1163 input_bfd,
1164 input_section,
1166 symname);
1169 }
1170 }
1171 }
1174 {
1175 /* For relocs against symbols from removed linkonce sections,
1176 or sections discarded by a linker script, we just want the
1177 section contents zeroed. Avoid any special processing. */
1182 }
1188 {
1191 /* This is like the case for R_CRIS_32_GOT and R_CRIS_16_GOT,
1192 but we require a PLT, and the PLT handling will take care of
1193 filling in the PLT-specific GOT entry. For the GOT offset,
1194 calculate it as we do when filling it in for the .got.plt
1195 section. If we don't have a PLT, punt to GOT handling. */
1198 {
1199 asection *sgotplt
1201 bfd_vma got_offset;
1206 got_offset
1211 }
1213 /* We didn't make a PLT entry for this symbol. Maybe everything is
1214 folded into the GOT. Other than folding, this happens when
1215 statically linking PIC code, or when using -Bsymbolic. Check
1216 that we instead have a GOT entry as done for us by
1217 elf_cris_adjust_dynamic_symbol, and drop through into the
1218 ordinary GOT cases. This must not happen for the
1219 executable, because any reference it does to a function
1220 that is satisfied by a DSO must generate a PLT. We assume
1221 these call-specific relocs don't address non-functions. */
1228 {
1235 input_bfd,
1236 input_section,
1241 /* FIXME: Perhaps blaming input is not the right thing to
1242 do; this is probably an internal error. But it is true
1243 that we didn't like that particular input. */
1246 }
1247 /* Fall through. */
1249 /* The size of the actual relocation is not used here; we only
1250 fill in the GOT table here. */
1253 {
1254 bfd_vma off;
1256 /* Note that despite using RELA relocations, the .got contents
1257 is always filled in with the link-relative relocation
1258 value; the addend. */
1261 {
1273 {
1274 /* This wasn't checked above for ! info->shared, but
1275 must hold there if we get here; the symbol must
1276 be defined in the regular program or be undefweak
1277 or be a function or otherwise need a PLT. */
1285 /* This is actually a static link, or it is a
1286 -Bsymbolic link and the symbol is defined locally,
1287 or is undefweak, or the symbol was forced to be
1288 local because of a version file, or we're not
1289 creating a dynamic object. We must initialize this
1290 entry in the global offset table. Since the offset
1291 must always be a multiple of 4, we use the least
1292 significant bit to record whether we have
1293 initialized it already.
1295 If this GOT entry should be runtime-initialized, we
1296 will create a .rela.got relocation entry to
1297 initialize the value. This is done in the
1298 finish_dynamic_symbol routine. */
1301 else
1302 {
1306 }
1307 }
1308 }
1309 else
1310 {
1316 /* The offset must always be a multiple of 4. We use
1317 the least significant bit to record whether we have
1318 already generated the necessary reloc. */
1321 else
1322 {
1326 {
1327 Elf_Internal_Rela outrel;
1331 srelgot
1343 }
1346 }
1347 }
1351 {
1352 /* We can't do anything for a relocation which is against
1353 a symbol *plus offset*. GOT holds relocations for
1354 symbols. Make this an error; the compiler isn't
1355 allowed to pass us these kinds of things. */
1360 input_bfd,
1361 input_section,
1364 else
1368 input_bfd,
1369 input_section,
1376 }
1377 }
1381 /* This relocation must only be performed against local symbols.
1382 It's also ok when we link a program and the symbol is either
1383 defined in an ordinary (non-DSO) object or is undefined weak. */
1390 {
1394 input_bfd,
1395 input_section,
1397 symname);
1400 }
1402 /* This can happen if we get a link error with the input ELF
1403 variant mismatching the output variant. Emit an error so
1404 it's noticed if it happens elsewhere. */
1406 {
1409 input_bfd,
1410 input_section,
1414 }
1416 /* This relocation is like a PC-relative one, except the
1417 reference point is the location of GOT. Note that
1418 sgot->output_offset is not involved in this calculation. We
1419 always want the start of entire .got section, not the
1420 position after the reserved header. */
1425 /* Relocation is to the entry for this symbol in the
1426 procedure linkage table. */
1428 /* Resolve a PLT_PCREL reloc against a local symbol directly,
1429 without using the procedure linkage table. */
1435 {
1436 /* We didn't make a PLT entry for this symbol. This
1437 happens when statically linking PIC code, or when
1438 using -Bsymbolic. */
1440 }
1448 /* Like R_CRIS_32_PLT_PCREL, but the reference point is the
1449 start of the .got section. See also comment at
1450 R_CRIS_32_GOT. */
1453 /* Resolve a PLT_GOTREL reloc against a local symbol directly,
1454 without using the procedure linkage table. */
1460 {
1461 /* We didn't make a PLT entry for this symbol. This
1462 happens when statically linking PIC code, or when
1463 using -Bsymbolic. */
1465 }
1476 /* If the symbol was local, we need no shlib-specific handling. */
1480 /* Fall through. */
1492 {
1493 Elf_Internal_Rela outrel;
1497 /* When generating a shared object, these relocations
1498 are copied into the output file to be resolved at run
1499 time. */
1502 {
1503 sreloc = _bfd_elf_get_dynamic_reloc_section
1505 /* The section should have been created in cris_elf_check_relocs,
1506 but that function will not be called for objects which fail in
1507 cris_elf_merge_private_bfd_data. */
1509 {
1512 }
1513 }
1530 /* h->dynindx may be -1 if the symbol was marked to
1531 become local. */
1535 {
1539 }
1540 else
1541 {
1545 {
1548 }
1549 else
1550 {
1556 {
1559 }
1560 else
1561 {
1564 /* We are turning this relocation into one
1565 against a section symbol. It would be
1566 proper to subtract the symbol's value,
1567 osec->vma, from the emitted reloc addend,
1568 but ld.so expects buggy relocs. */
1572 {
1577 }
1579 }
1582 }
1583 }
1589 /* This reloc will be computed at runtime, so there's no
1590 need to do anything now, except for R_CRIS_32 relocations
1591 that have been turned into R_CRIS_RELATIVE. */
1594 }
1600 /* This relocation must only be performed against local
1601 symbols. It's also ok when we link a program and the
1602 symbol is defined in an ordinary (non-DSO) object (if
1603 it's undefined there, we've already seen an error). */
1609 {
1612 /* We shouldn't get here for GCC-emitted code. */
1616 " not allowed for `%s', a global symbol with default"
1618 input_bfd,
1619 input_section,
1625 }
1629 /* Fill in a R_CRIS_DTPMOD reloc at offset 3 if we haven't
1630 already done so. Note that we do this in .got.plt, not
1631 in .got, as .got.plt contains the first part, still the
1632 reloc is against .got, because the linker script directs
1633 (is required to direct) them both into .got. */
1635 {
1640 {
1641 Elf_Internal_Rela outrel;
1658 }
1659 else
1660 {
1661 /* For an executable, the GOT entry contents is known. */
1664 }
1666 /* Reverse the sign to mark that we've emitted the
1667 required GOT entry. */
1670 }
1672 /* The thread-based offset to the local symbol is the
1673 relocation. */
1680 {
1683 /* We've already informed in cris_elf_check_relocs that
1684 this is an error. */
1686 }
1687 /* Fall through. */
1692 {
1693 /* We can't do anything for a relocation which is against a
1694 symbol *plus offset*. The GOT holds relocations for
1695 symbols. Make this an error; the compiler isn't allowed
1696 to pass us these kinds of things. */
1700 input_bfd,
1701 input_section,
1708 }
1711 {
1712 /* Known contents of the GOT. */
1713 bfd_vma off;
1715 /* The symbol is defined in the program, so just write
1716 (1, known_tpoffset) into the GOT. */
1720 {
1723 }
1724 else
1725 {
1729 }
1731 /* We use bit 1 of the offset as a flag for GOT entry with
1732 the R_CRIS_DTP reloc, setting it when we've emitted the
1733 GOT entry and reloc. Bit 0 is used for R_CRIS_32_TPREL
1734 relocs. */
1736 {
1741 else
1746 }
1747 else
1752 }
1753 else
1754 {
1755 /* Not all parts of the GOT entry are known; emit a real
1756 relocation. */
1757 bfd_vma off;
1762 else
1763 {
1767 }
1769 /* See above re bit 1 and bit 0 usage. */
1771 {
1772 Elf_Internal_Rela outrel;
1779 else
1782 /* Clear the target contents of the GOT (just as a
1783 gesture; it's already cleared on allocation): this
1784 relocation is not like the other dynrelocs. */
1793 {
1796 }
1797 else
1798 {
1801 /* NULL if we had an error. */
1804 }
1813 /* NULL if we had an error. */
1816 }
1817 else
1822 }
1824 /* The GOT-relative offset to the GOT entry is the
1825 relocation, or for R_CRIS_32_GD, the actual address of
1826 the GOT entry. */
1832 {
1833 /* We can't do anything for a relocation which is
1834 against a symbol *plus offset*. GOT holds
1835 relocations for symbols. Make this an error; the
1836 compiler isn't allowed to pass us these kinds of
1837 things. */
1841 input_bfd,
1842 input_section,
1848 }
1851 {
1852 /* Known contents of the GOT. */
1853 bfd_vma off;
1855 /* The symbol is defined in the program, so just write
1856 the known_tpoffset into the GOT. */
1861 else
1864 /* Bit 0 is used to mark whether we've emitted the required
1865 entry (and if needed R_CRIS_32_TPREL reloc). Bit 1
1866 is used similarly for R_CRIS_DTP, see above. */
1868 {
1873 else
1877 }
1878 else
1882 }
1883 else
1884 {
1885 /* Emit a real relocation. */
1886 bfd_vma off;
1890 else
1893 /* See above re usage of bit 0 and 1. */
1895 {
1896 Elf_Internal_Rela outrel;
1903 else
1911 {
1914 }
1915 else
1916 {
1919 /* NULL if we had an error. */
1922 }
1924 /* Just "define" the initial contents in some
1925 semi-logical way. */
1934 /* NULL if we had an error. */
1937 }
1938 else
1942 }
1944 /* The GOT-relative offset to the GOT entry is the relocation. */
1949 /* This relocation must only be performed against symbols
1950 defined in an ordinary (non-DSO) object. */
1952 {
1955 /* We've already informed in cris_elf_check_relocs that
1956 this is an error. */
1958 }
1963 /* If it's undefined, then an error message has already
1964 been emitted. */
1966 {
1969 " not allowed for symbol: `%s'"
1970 " which is defined outside the program,"
1972 input_bfd,
1973 input_section,
1975 symname);
1978 }
1980 /* NULL if we had an error. */
1984 /* The TLS-relative offset is the relocation. */
1990 }
1996 {
2000 {
2006 {
2007 additional_relocation_error_msg_count--;
2009 {
2013 /* Not just TLS is involved here, so we make
2014 generation and message depend on -fPIC/-fpic
2015 only. */
2027 " -msmall-tls: recompile with -fPIC or"
2031 /* No known cause for overflow for other relocs. */
2034 }
2035 }
2041 TRUE);
2059 }
2067 }
2068 }
2071 }
2072 \f
2073 /* Finish up dynamic symbol handling. We set the contents of various
2074 dynamic sections here. */
2076 static bfd_boolean
2082 {
2085 /* Where in the plt entry to put values. */
2088 /* What offset to add to the distance to the first PLT entry for the
2089 value at plt_off3. */
2092 /* Where in the PLT entry the call-dynlink-stub is (happens to be same
2093 for PIC and non-PIC for v32 and pre-v32). */
2099 /* Adjust the various PLT entry offsets. */
2101 {
2109 }
2114 {
2119 bfd_vma got_base;
2121 bfd_vma gotplt_offset
2123 Elf_Internal_Rela rela;
2127 /* Get the index in the procedure linkage table which
2128 corresponds to this symbol. This is the index of this symbol
2129 in all the symbols for which we are making plt entries. The
2130 first entry in the procedure linkage table is reserved. */
2131 /* We have to count backwards here, and the result is only valid as
2132 an index into .got.plt and its relocations. FIXME: Constants... */
2135 /* Get the offset into the .got table of the entry that corresponds
2136 to this function. Note that we embed knowledge that "incoming"
2137 .got goes after .got.plt in the output without padding (pointer
2138 aligned). However, that knowledge is present in several other
2139 places too. */
2140 bfd_vma got_offset
2141 = (has_gotplt
2142 ? gotplt_offset
2145 /* This symbol has an entry in the procedure linkage table. Set it
2146 up. */
2159 /* Fill in the entry in the procedure linkage table. */
2161 {
2163 plt_entry_size);
2165 /* We need to enter the absolute address of the GOT entry here. */
2168 }
2169 else
2170 {
2172 plt_entry_size);
2175 }
2177 /* Fill in the plt entry and make a relocation, if this is a "real"
2178 PLT entry. */
2180 {
2181 /* Fill in the offset to the reloc table. */
2186 /* Fill in the offset to the first PLT entry, where to "jump". */
2191 /* Fill in the entry in the global offset table with the address of
2192 the relocating stub. */
2200 /* Fill in the entry in the .rela.plt section. */
2208 }
2211 {
2212 /* Mark the symbol as undefined, rather than as defined in
2213 the .plt section. Leave the value alone. */
2216 /* FIXME: From elf32-sparc.c 2001-02-19 (1.18). I still don't
2217 know whether resetting the value is significant; if it really
2218 is, rather than a quirk or bug in the sparc port, then I
2219 believe we'd see this elsewhere. */
2220 /* If the symbol is weak, we do need to clear the value.
2221 Otherwise, the PLT entry would provide a definition for
2222 the symbol even if the symbol wasn't defined anywhere,
2223 and so the symbol would never be NULL. */
2226 }
2227 }
2229 /* For an ordinary program, we emit .got relocs only for symbols that
2230 are in the dynamic-symbols table and are either defined by the
2231 program or are undefined weak symbols, or are function symbols
2232 where we do not output a PLT: the PLT reloc was output above and all
2233 references to the function symbol are redirected to the PLT. */
2241 {
2244 Elf_Internal_Rela rela;
2248 /* This symbol has an entry in the global offset table. Set it up. */
2258 /* If this is a static link, or it is a -Bsymbolic link and the
2259 symbol is defined locally or was forced to be local because
2260 of a version file, we just want to emit a RELATIVE reloc.
2261 The entry in the global offset table will already have been
2262 initialized in the relocate_section function. */
2268 {
2271 }
2272 else
2273 {
2277 }
2282 }
2285 {
2287 Elf_Internal_Rela rela;
2290 /* This symbol needs a copy reloc. Set it up. */
2307 }
2309 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2315 }
2316 \f
2317 /* Finish up the dynamic sections. Do *not* emit relocs here, as their
2318 offsets were changed, as part of -z combreloc handling, from those we
2319 computed. */
2321 static bfd_boolean
2325 {
2337 {
2347 {
2348 Elf_Internal_Dyn dyn;
2354 {
2366 /* Yes, we *can* have a .plt and no .plt.rela, for instance
2367 if all symbols are found in the .got (not .got.plt). */
2377 else
2383 /* The procedure linkage table relocs (DT_JMPREL) should
2384 not be included in the overall relocs (DT_RELA).
2385 Therefore, we override the DT_RELASZ entry here to
2386 make it not include the JMPREL relocs. Since the
2387 linker script arranges for .rela.plt to follow all
2388 other relocation sections, we don't have to worry
2389 about changing the DT_RELA entry. */
2395 }
2396 }
2398 /* Fill in the first entry in the procedure linkage table. */
2400 {
2402 {
2405 PLT_ENTRY_SIZE_V32);
2406 else
2407 {
2409 PLT_ENTRY_SIZE_V32);
2417 }
2418 }
2419 else
2420 {
2423 PLT_ENTRY_SIZE);
2424 else
2425 {
2427 PLT_ENTRY_SIZE);
2439 }
2440 }
2441 }
2442 }
2444 /* Fill in the first three entries in the global offset table. */
2446 {
2449 else
2455 }
2460 }
2461 \f
2462 /* Return the section that should be marked against GC for a given
2463 relocation. */
2471 {
2475 {
2482 }
2485 }
2487 /* Update the got entry reference counts for the section being removed. */
2489 static bfd_boolean
2494 {
2519 {
2528 {
2533 }
2537 {
2565 }
2568 {
2577 {
2578 /* If the counters are 0 when we got here, we've
2579 miscounted somehow somewhere, an internal error. */
2586 {
2587 /* We don't need the .got entry any more. */
2590 }
2592 }
2594 local_got_reloc:
2596 {
2597 /* If the counters are 0 when we got here, we've
2598 miscounted somehow somewhere, an internal error. */
2605 {
2606 /* We don't need the .got entry any more. */
2610 }
2611 }
2616 /* For local symbols, treat these like GOT relocs. */
2619 /* Fall through. */
2622 /* FIXME: We don't garbage-collect away the .got section. */
2625 /* Fall through. */
2632 {
2636 }
2650 }
2651 }
2654 }
2656 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
2657 entry but we found we will not create any. Called when we find we will
2658 not have any PLT for this symbol, by for example
2659 elf_cris_adjust_dynamic_symbol when we're doing a proper dynamic link,
2660 or elf_cris_size_dynamic_sections if no dynamic sections will be
2661 created (we're only linking static objects). */
2663 static bfd_boolean
2666 PTR p;
2667 {
2673 /* If nobody wanted a GOTPLT with this symbol, we're done. */
2678 {
2679 /* There's a GOT entry for this symbol. Just adjust the refcounts.
2680 Probably not necessary at this stage, but keeping them accurate
2681 helps avoiding surprises later. */
2685 }
2686 else
2687 {
2688 /* No GOT entry for this symbol. We need to create one. */
2697 /* Put accurate refcounts there. */
2703 /* We always have a .got and a .rela.got section if there were
2704 GOTPLT relocs in input. */
2707 /* Allocate space in the .got section. */
2710 /* Allocate relocation space. */
2712 }
2715 }
2717 /* Try to fold PLT entries with GOT entries. There are two cases when we
2718 want to do this:
2720 - When all PLT references are GOTPLT references, and there are GOT
2721 references, and this is not the executable. We don't have to
2722 generate a PLT at all.
2724 - When there are both (ordinary) PLT references and GOT references,
2725 and this isn't the executable.
2726 We want to make the PLT reference use the ordinary GOT entry rather
2727 than R_CRIS_JUMP_SLOT, a run-time dynamically resolved GOTPLT entry,
2728 since the GOT entry will have to be resolved at startup anyway.
2730 Though the latter case is handled when room for the PLT is allocated,
2731 not here.
2733 By folding into the GOT, we may need a round-trip to a PLT in the
2734 executable for calls, a loss in performance. Still, losing a
2735 reloc is a win in size and at least in start-up time.
2737 Note that this function is called before symbols are forced local by
2738 version scripts. The differing cases are handled by
2739 elf_cris_hide_symbol. */
2741 static bfd_boolean
2744 PTR p;
2745 {
2748 /* If there are no GOT references for this symbol, we can't fold any
2749 other reference so there's nothing to do. Likewise if there are no
2750 PLT references; GOTPLT references included. */
2754 /* GOTPLT relocs are supposed to be included into the PLT refcount. */
2758 {
2759 /* The only PLT references are GOTPLT references, and there are GOT
2760 references. Convert PLT to GOT references. */
2764 /* Clear the PLT references, so no PLT will be created. */
2766 }
2769 }
2771 /* Our own version of hide_symbol, so that we can adjust a GOTPLT reloc
2772 to use a GOT entry (and create one) rather than requiring a GOTPLT
2773 entry. */
2775 static void
2779 bfd_boolean force_local;
2780 {
2784 }
2786 /* Adjust a symbol defined by a dynamic object and referenced by a
2787 regular object. The current definition is in some section of the
2788 dynamic object, but we're not including those sections. We have to
2789 change the definition to something the rest of the link can
2790 understand. */
2792 static bfd_boolean
2796 {
2799 bfd_size_type plt_entry_size;
2803 /* Make sure we know what is going on here. */
2811 plt_entry_size
2815 /* If this is a function, put it in the procedure linkage table. We
2816 will fill in the contents of the procedure linkage table later,
2817 when we know the address of the .got section. */
2820 {
2821 /* If we link a program (not a DSO), we'll get rid of unnecessary
2822 PLT entries; we point to the actual symbols -- even for pic
2823 relocs, because a program built with -fpic should have the same
2824 result as one built without -fpic, specifically considering weak
2825 symbols.
2826 FIXME: m68k and i386 differ here, for unclear reasons. */
2829 {
2830 /* This case can occur if we saw a PLT reloc in an input file,
2831 but the symbol was not defined by a dynamic object. In such
2832 a case, we don't actually need to build a procedure linkage
2833 table, and we can just do an absolute or PC reloc instead, or
2834 change a .got.plt index to a .got index for GOTPLT relocs. */
2838 return
2841 info);
2842 }
2844 /* If we had a R_CRIS_GLOB_DAT that didn't have to point to a PLT;
2845 where a pointer-equivalent symbol was unimportant (i.e. more
2846 like R_CRIS_JUMP_SLOT after symbol evaluation) we could get rid
2847 of the PLT. We can't for the executable, because the GOT
2848 entries will point to the PLT there (and be constant). */
2854 /* GC or folding may have rendered this entry unused. */
2856 {
2860 }
2862 /* Make sure this symbol is output as a dynamic symbol. */
2864 {
2867 }
2872 /* If this is the first .plt entry, make room for the special
2873 first entry. */
2877 /* If this symbol is not defined in a regular file, and we are
2878 not generating a shared library, then set the symbol to this
2879 location in the .plt. */
2882 {
2885 }
2887 /* If there's already a GOT entry, use that, not a .got.plt. A
2888 GOT field still has a reference count when we get here; it's
2889 not yet changed to an offset. We can't do this for an
2890 executable, because then the reloc associated with the PLT
2891 would get a non-PLT reloc pointing to the PLT. FIXME: Move
2892 this to elf_cris_try_fold_plt_to_got. */
2894 {
2897 /* Mark the PLT offset to use the GOT entry by setting the low
2898 bit in the plt offset; it is always a multiple of
2899 plt_entry_size (which is at least a multiple of 2). */
2902 /* Change the PLT refcount to an offset. */
2905 /* By not setting gotplt_offset (i.e. it remains at 0), we signal
2906 that the got entry should be used instead. */
2910 /* Make room for this entry. */
2914 }
2916 /* No GOT reference for this symbol; prepare for an ordinary PLT. */
2919 /* Make room for this entry. */
2922 /* We also need to make an entry in the .got.plt section, which
2923 will be placed in the .got section by the linker script. */
2932 /* We also need to make an entry in the .rela.plt section. */
2939 }
2941 /* Reinitialize the plt offset now that it is not used as a reference
2942 count any more. */
2945 /* If this is a weak symbol, and there is a real definition, the
2946 processor independent code will have arranged for us to see the
2947 real definition first, and we can just use the same value. */
2949 {
2955 }
2957 /* This is a reference to a symbol defined by a dynamic object which
2958 is not a function. */
2960 /* If we are creating a shared library, we must presume that the
2961 only references to the symbol are via the global offset table.
2962 For such cases we need not do anything here; the relocations will
2963 be handled correctly by relocate_section. */
2967 /* If there are no references to this symbol that do not use the
2968 GOT, we don't need to generate a copy reloc. */
2973 {
2977 }
2979 /* We must allocate the symbol in our .dynbss section, which will
2980 become part of the .bss section of the executable. There will be
2981 an entry for this symbol in the .dynsym section. The dynamic
2982 object will contain position independent code, so all references
2983 from the dynamic object to this symbol will go through the global
2984 offset table. The dynamic linker will use the .dynsym entry to
2985 determine the address it must put in the global offset table, so
2986 both the dynamic object and the regular object will refer to the
2987 same memory location for the variable. */
2992 /* We must generate a R_CRIS_COPY reloc to tell the dynamic linker to
2993 copy the initial value out of the dynamic object and into the
2994 runtime process image. We need to remember the offset into the
2995 .rela.bss section we are going to use. */
2997 {
3004 }
3007 }
3009 /* Look through the relocs for a section during the first phase. */
3011 static bfd_boolean
3017 {
3042 {
3051 {
3054 }
3055 else
3056 {
3061 }
3065 /* Some relocs require linker-created sections; we need to hang them
3066 on the first input bfd we found that contained dynamic relocs. */
3068 {
3071 /* The first .got.plt entry is right after the R_CRIS_DTPMOD
3072 entry at index 3. */
3076 /* Fall through. */
3091 {
3094 /* We could handle this if we can get a handle on the
3095 output bfd in elf_cris_adjust_dynamic_symbol. Failing
3096 that, we must insist on dynobj being a specific mach. */
3098 {
3104 }
3106 /* Create the .got section, so we can assume it's always
3107 present whenever there's a dynobj. */
3110 }
3116 {
3117 bfd_size_type amt;
3119 /* We use index local_got_refcounts[-1] to count all
3120 GOT-relative relocations that do not have explicit
3121 GOT entries. */
3128 local_got_refcounts++;
3130 }
3135 }
3137 /* Some relocs require a global offset table (but perhaps not a
3138 specific GOT entry). */
3140 {
3143 /* Not requesting .got.rela for an executable: the contents
3144 of the first entry is constant there. For a shared
3145 library, we need .got.rela for the R_CRIS_DTPMOD
3146 relocation at index 3. */
3149 /* Fall through. */
3156 /* Fall through. */
3158 /* For R_CRIS_16_GOTPLT and R_CRIS_32_GOTPLT, we need a GOT
3159 entry only for local symbols. Unfortunately, we don't know
3160 until later on if there's a version script that forces the
3161 symbol local. We must have the .rela.got section in place
3162 before we know if the symbol looks global now, so we need
3163 to treat the reloc just like for R_CRIS_16_GOT and
3164 R_CRIS_32_GOT. */
3171 {
3174 {
3177 (SEC_ALLOC
3178 | SEC_LOAD
3179 | SEC_HAS_CONTENTS
3180 | SEC_IN_MEMORY
3181 | SEC_LINKER_CREATED
3186 }
3187 }
3192 }
3194 /* Warn and error for invalid input. */
3196 {
3201 {
3204 " in a shared object;"
3206 abfd,
3207 sec,
3209 /* Don't return FALSE here; we want messages for all of
3210 these and the error behavior is ungraceful
3211 anyway. */
3212 }
3215 }
3218 {
3222 /* These are requests for tls_index entries, run-time R_CRIS_DTP. */
3229 /* These two just request for the constant-index
3230 module-local tls_index-sized GOT entry, which we add
3231 elsewhere. */
3238 /* Those two relocs also require that a DSO is of type
3239 Initial Exec. Like other targets, we don't reset this
3240 flag even if the relocs are GC:ed away. */
3245 /* Let's list the other assembler-generated TLS-relocs too,
3246 just to show that they're not forgotten. */
3251 }
3254 {
3257 /* Mark that we need a GOT entry if the PLT entry (and its GOT
3258 entry) is eliminated. We can only do this for a non-local
3259 symbol. */
3261 {
3264 }
3265 /* If h is NULL then this is a local symbol, and we must make a
3266 GOT entry for it, so handle it like a GOT reloc. */
3267 /* Fall through. */
3276 /* This symbol requires a global offset table entry. */
3278 {
3280 {
3281 /* Make sure this symbol is output as a dynamic symbol. */
3283 {
3286 }
3287 }
3289 /* Update the sum of reloc counts for this symbol. */
3293 {
3297 {
3298 /* Allocate space in the .got section. */
3300 /* Allocate relocation space. */
3302 }
3310 {
3311 /* Allocate space in the .got section. */
3313 /* Allocate relocation space. */
3315 }
3322 {
3323 /* Allocate space in the .got section. */
3325 /* Allocate relocation space. */
3327 }
3334 }
3335 }
3336 else
3337 {
3338 /* This is a global offset table entry for a local symbol. */
3340 {
3343 {
3344 /* If we are generating a shared object, we need
3345 to output a R_CRIS_RELATIVE reloc so that the
3346 dynamic linker can adjust this GOT entry.
3347 Similarly for non-regular got entries. */
3349 }
3350 }
3351 /* Update the reloc-specific count. */
3354 /* This one is the sum of all the others. */
3356 }
3362 /* This reference requires a global offset table.
3363 FIXME: The actual refcount isn't used currently; the .got
3364 section can't be removed if there were any references in the
3365 input. */
3369 handle_gotplt_reloc:
3372 /* This reference requires a global offset table. */
3374 /* Fall through. */
3377 /* This symbol requires a procedure linkage table entry. We
3378 actually build the entry in adjust_dynamic_symbol,
3379 because this might be a case of linking PIC code which is
3380 never referenced by a dynamic object, in which case we
3381 don't need to generate a procedure linkage table entry
3382 after all. */
3384 /* Beware: if we'd check for visibility of the symbol here
3385 (and not marking the need for a PLT when non-visible), we'd
3386 get into trouble with keeping handling consistent with
3387 regards to relocs found before definition and GOTPLT
3388 handling. Eliminable PLT entries will be dealt with later
3389 anyway. */
3400 /* Let's help debug shared library creation. Any of these
3401 relocs can be used in shared libs, but pages containing them
3402 cannot be shared. Don't warn for sections we don't care
3403 about, such as debug sections or non-constant sections. We
3404 can't help tables of (global) function pointers, for example,
3405 though they must be emitted in a data section to avoid having
3406 impure text sections. */
3410 {
3411 /* FIXME: How do we make this optionally a warning only? */
3415 abfd,
3416 sec,
3418 }
3420 /* Fall through. */
3426 {
3429 /* Make sure a plt entry is created for this symbol if it
3430 turns out to be a function defined by a dynamic object. */
3433 }
3435 /* If we are creating a shared library and this is not a local
3436 symbol, we need to copy the reloc into the shared library.
3437 However when linking with -Bsymbolic and this is a global
3438 symbol which is defined in an object we are including in the
3439 link (i.e., DEF_REGULAR is set), then we can resolve the
3440 reloc directly. At this point we have not seen all the input
3441 files, so it is possible that DEF_REGULAR is not set now but
3442 will be set later (it is never cleared). In case of a weak
3443 definition, DEF_REGULAR may be cleared later by a strong
3444 definition in a shared library. We account for that
3445 possibility below by storing information in the relocs_copied
3446 field of the hash table entry. A similar situation occurs
3447 when creating shared libraries and symbol visibility changes
3448 render the symbol local. */
3450 /* No need to do anything if we're not creating a shared object. */
3454 /* We don't need to handle relocs into sections not going into
3455 the "real" output. */
3459 /* We can only eliminate PC-relative relocs. */
3463 {
3464 /* If the symbol is local, then we can eliminate the reloc. */
3468 /* If this is with -Bsymbolic and the symbol isn't weak, and
3469 is defined by an ordinary object (the ones we include in
3470 this shared library) then we can also eliminate the
3471 reloc. See comment above for more eliminable cases which
3472 we can't identify at this time. */
3479 {
3480 /* FIXME: How do we make this optionally a warning only? */
3484 abfd,
3485 sec,
3487 }
3488 }
3490 /* We may need to create a reloc section in the dynobj and made room
3491 for this reloc. */
3493 {
3494 sreloc = _bfd_elf_make_dynamic_reloc_section
3502 }
3506 /* If we are linking with -Bsymbolic, we count the number of PC
3507 relative relocations we have entered for this symbol, so that
3508 we can discard them again if the symbol is later defined by a
3509 regular object. We know that h is really a pointer to an
3510 elf_cris_link_hash_entry. */
3515 {
3526 {
3535 }
3538 }
3541 /* This relocation describes the C++ object vtable hierarchy.
3542 Reconstruct it for later use during GC. */
3548 /* This relocation describes which C++ vtable entries are actually
3549 used. Record for later use during GC. */
3559 /* Already warned above, when necessary. */
3563 /* Other relocs do not appear here. */
3566 }
3567 }
3570 }
3572 /* Set the sizes of the dynamic sections. */
3574 static bfd_boolean
3578 {
3581 bfd_boolean plt;
3582 bfd_boolean relocs;
3588 {
3589 /* Set the contents of the .interp section to the interpreter. */
3591 {
3596 }
3597 }
3598 else
3599 {
3600 /* Adjust all expected GOTPLT uses to use a GOT entry instead. */
3602 elf_cris_adjust_gotplt_to_got,
3605 /* We may have created entries in the .rela.got section.
3606 However, if we are not creating the dynamic sections, we will
3607 not actually use these entries. Reset the size of .rela.got,
3608 which will cause it to get stripped from the output file
3609 below. */
3613 }
3615 /* If this is a -Bsymbolic shared link, then we need to discard all PC
3616 relative relocs against symbols defined in a regular object. We
3617 allocated space for them in the check_relocs routine, but we will not
3618 fill them in in the relocate_section routine. We also discard space
3619 for relocs that have become for local symbols due to symbol
3620 visibility changes. For programs, we discard space for relocs for
3621 symbols not referenced by any dynamic object. */
3624 elf_cris_discard_excess_dso_dynamics,
3626 else
3628 elf_cris_discard_excess_program_dynamics,
3631 /* The check_relocs and adjust_dynamic_symbol entry points have
3632 determined the sizes of the various dynamic sections. Allocate
3633 memory for them. */
3637 {
3643 /* It's OK to base decisions on the section name, because none
3644 of the dynobj section names depend upon the input files. */
3648 {
3649 /* Remember whether there is a PLT. */
3651 }
3653 {
3654 /* The .got.plt contains the .got header as well as the
3655 actual .got.plt contents. The .got header may contain a
3656 R_CRIS_DTPMOD entry at index 3. */
3659 }
3661 {
3668 {
3669 /* Remember whether there are any reloc sections other
3670 than .rela.plt. */
3674 /* We use the reloc_count field as a counter if we need
3675 to copy relocs into the output file. */
3677 }
3678 }
3681 {
3682 /* It's not one of our sections, so don't allocate space. */
3684 }
3687 {
3688 /* If we don't need this section, strip it from the
3689 output file. This is mostly to handle .rela.bss and
3690 .rela.plt. We must create both sections in
3691 create_dynamic_sections, because they must be created
3692 before the linker maps input sections to output
3693 sections. The linker does that before
3694 adjust_dynamic_symbol is called, and it is that
3695 function which decides whether anything needs to go
3696 into these sections. */
3699 }
3704 /* Allocate memory for the section contents. We use bfd_zalloc here
3705 in case unused entries are not reclaimed before the section's
3706 contents are written out. This should not happen, but this way
3707 if it does, we will not write out garbage. For reloc sections,
3708 this will make entries have the type R_CRIS_NONE. */
3712 }
3715 {
3716 /* Add some entries to the .dynamic section. We fill in the
3717 values later, in elf_cris_finish_dynamic_sections, but we
3718 must add the entries now so that we get the correct size for
3719 the .dynamic section. The DT_DEBUG entry is filled in by the
3720 dynamic linker and used by the debugger. */
3721 #define add_dynamic_entry(TAG, VAL) \
3722 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3725 {
3728 }
3731 {
3737 }
3740 {
3745 }
3748 {
3752 }
3753 }
3754 #undef add_dynamic_entry
3757 }
3759 /* This function is called via elf_cris_link_hash_traverse if we are
3760 creating a shared object. In the -Bsymbolic case, it discards the
3761 space allocated to copy PC relative relocs against symbols which
3762 are defined in regular objects. For the normal non-symbolic case,
3763 we also discard space for relocs that have become local due to
3764 symbol visibility changes. We allocated space for them in the
3765 check_relocs routine, but we won't fill them in in the
3766 relocate_section routine. */
3768 static bfd_boolean
3771 PTR inf;
3772 {
3779 /* If a symbol has been forced local or we have found a regular
3780 definition for the symbolic link case, then we won't be needing
3781 any relocs. */
3785 {
3788 }
3791 }
3793 /* This function is called via elf_cris_link_hash_traverse if we are *not*
3794 creating a shared object. We discard space for relocs for symbols put
3795 in the .got, but which we found we do not have to resolve at run-time. */
3797 static bfd_boolean
3800 PTR inf;
3801 {
3807 /* If we're not creating a shared library and have a symbol which is
3808 referred to by .got references, but the symbol is defined locally,
3809 (or rather, not defined by a DSO) then lose the reloc for the .got
3810 (don't allocate room for it). Likewise for relocs for something
3811 for which we create a PLT. */
3814 {
3816 /* The size of this section is only valid and in sync with the
3817 various reference counts if we do dynamic; don't decrement it
3818 otherwise. */
3820 {
3831 }
3833 /* If the locally-defined symbol isn't used by a DSO, then we don't
3834 have to export it as a dynamic symbol. This was already done for
3835 functions; doing this for all symbols would presumably not
3836 introduce new problems. Of course we don't do this if we're
3837 exporting all dynamic symbols. */
3842 {
3846 }
3847 }
3850 }
3852 /* Reject a file depending on presence and expectation of prefixed
3853 underscores on symbols. */
3855 static bfd_boolean
3858 {
3864 else
3866 }
3868 /* Mark presence or absence of leading underscore. Set machine type
3869 flags from mach type. */
3871 static void
3874 bfd_boolean linker ATTRIBUTE_UNUSED;
3875 {
3883 {
3899 }
3902 }
3904 /* Set the mach type from e_flags value. */
3906 static bfd_boolean
3910 {
3912 {
3926 /* Since we don't recognize them, we obviously can't support them
3927 with this code; we'd have to require that all future handling
3928 would be optional. */
3931 }
3934 }
3936 /* Display the flags field. */
3938 static bfd_boolean
3941 PTR ptr;
3942 {
3962 }
3964 /* Don't mix files with and without a leading underscore. */
3966 static bfd_boolean
3970 {
3983 {
3984 /* This happens when ld starts out with a 'blank' output file. */
3987 /* We ignore the linker-set mach, and instead set it according to
3988 the first input file. This would also happen if we could
3989 somehow filter out the OUTPUT_ARCH () setting from elf.sc.
3990 This allows us to keep the same linker config across
3991 cris(v0..v10) and crisv32. The drawback is that we can't force
3992 the output type, which might be a sane thing to do for a
3993 v10+v32 compatibility object. */
3996 }
4000 {
4005 ibfd);
4008 }
4013 {
4014 /* We can get an incompatible combination only if either is
4015 bfd_mach_cris_v32, and the other one isn't compatible. */
4020 {
4027 ibfd);
4030 }
4032 /* We don't have to check the case where the input is compatible
4033 with v10 and v32, because the output is already known to be set
4034 to the other (compatible) mach. */
4038 }
4041 }
4043 /* Do side-effects of e_flags copying to obfd. */
4045 static bfd_boolean
4049 {
4050 /* Call the base function. */
4054 /* If output is big-endian for some obscure reason, stop here. */
4062 /* Do what we really came here for. */
4064 }
4066 static enum elf_reloc_type_class
4069 {
4072 {
4081 }
4082 }
4084 /* The elf_backend_got_elt_size worker. For one symbol, we can have up to
4085 two GOT entries from three types with two different sizes. We handle
4086 it as a single entry, so we can use the regular offset-calculation
4087 machinery. */
4089 static bfd_vma
4095 {
4100 /* We may have one regular GOT entry or up to two TLS GOT
4101 entries. */
4103 {
4109 {
4110 /* We can't have a variable referred to both as a regular
4111 variable and through TLS relocs. */
4115 }
4122 }
4123 else
4124 {
4127 {
4128 /* The actual error-on-input is emitted elsewhere. */
4131 }
4138 }
4141 }
4142 \f
4143 #define ELF_ARCH bfd_arch_cris
4144 #define ELF_MACHINE_CODE EM_CRIS
4145 #define ELF_MAXPAGESIZE 0x2000
4147 #define TARGET_LITTLE_SYM bfd_elf32_cris_vec
4149 #define elf_symbol_leading_char 0
4151 #define elf_info_to_howto_rel NULL
4152 #define elf_info_to_howto cris_info_to_howto_rela
4153 #define elf_backend_relocate_section cris_elf_relocate_section
4154 #define elf_backend_gc_mark_hook cris_elf_gc_mark_hook
4155 #define elf_backend_gc_sweep_hook cris_elf_gc_sweep_hook
4156 #define elf_backend_check_relocs cris_elf_check_relocs
4157 #define elf_backend_grok_prstatus cris_elf_grok_prstatus
4158 #define elf_backend_grok_psinfo cris_elf_grok_psinfo
4160 #define elf_backend_can_gc_sections 1
4161 #define elf_backend_can_refcount 1
4163 #define elf_backend_object_p cris_elf_object_p
4164 #define elf_backend_final_write_processing \
4165 cris_elf_final_write_processing
4166 #define bfd_elf32_bfd_print_private_bfd_data \
4167 cris_elf_print_private_bfd_data
4168 #define bfd_elf32_bfd_merge_private_bfd_data \
4169 cris_elf_merge_private_bfd_data
4170 #define bfd_elf32_bfd_copy_private_bfd_data \
4171 cris_elf_copy_private_bfd_data
4173 #define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup
4174 #define bfd_elf32_bfd_reloc_name_lookup cris_reloc_name_lookup
4176 #define bfd_elf32_bfd_link_hash_table_create \
4177 elf_cris_link_hash_table_create
4178 #define elf_backend_adjust_dynamic_symbol \
4179 elf_cris_adjust_dynamic_symbol
4180 #define elf_backend_size_dynamic_sections \
4181 elf_cris_size_dynamic_sections
4182 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4183 #define elf_backend_finish_dynamic_symbol \
4184 elf_cris_finish_dynamic_symbol
4185 #define elf_backend_finish_dynamic_sections \
4186 elf_cris_finish_dynamic_sections
4187 #define elf_backend_create_dynamic_sections \
4188 _bfd_elf_create_dynamic_sections
4189 #define bfd_elf32_bfd_final_link \
4190 bfd_elf_gc_common_final_link
4191 #define elf_backend_hide_symbol elf_cris_hide_symbol
4192 #define elf_backend_reloc_type_class elf_cris_reloc_type_class
4194 #define elf_backend_want_got_plt 1
4195 #define elf_backend_plt_readonly 1
4196 #define elf_backend_want_plt_sym 0
4197 #define elf_backend_got_header_size 12
4198 #define elf_backend_got_elt_size elf_cris_got_elt_size
4200 /* Later, we my want to optimize RELA entries into REL entries for dynamic
4201 linking and libraries (if it's a win of any significance). Until then,
4202 take the easy route. */
4203 #define elf_backend_may_use_rel_p 0
4204 #define elf_backend_may_use_rela_p 1
4205 #define elf_backend_rela_normal 1
4209 #undef TARGET_LITTLE_SYM
4210 #undef TARGET_LITTLE_NAME
4211 #undef elf_symbol_leading_char
4213 #define TARGET_LITTLE_SYM bfd_elf32_us_cris_vec
4216 #undef elf32_bed
4217 #define elf32_bed elf32_us_cris_bed