| blob | 8b10dae21b320f4a19575b4cb3b28c4ff14c1d35 |
1 /* CRIS-specific support for 32-bit ELF.
2 Copyright (C) 2000-2024 Free Software Foundation, Inc.
3 Contributed by Axis Communications AB.
4 Written by Hans-Peter Nilsson, based on elf32-fr30.c
5 PIC and shlib bits based primarily on elf32-m68k.c and elf32-i386.c.
7 This file is part of BFD, the Binary File Descriptor library.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
29 #include <limits.h>
31 bfd_reloc_status_type
34 static bool
37 /* Forward declarations. */
39 {
40 /* This reloc does nothing. */
55 /* An 8 bit absolute relocation. */
70 /* A 16 bit absolute relocation. */
85 /* A 32 bit absolute relocation. */
92 /* We don't want overflow complaints for 64-bit vma builds
93 for e.g. sym+0x40000000 (or actually sym-0xc0000000 in
94 32-bit ELF) where sym=0xc0001234.
95 Don't do this for the PIC relocs, as we don't expect to
96 see them with large offsets. */
105 /* An 8 bit PC-relative relocation. */
120 /* A 16 bit PC-relative relocation. */
135 /* A 32 bit PC-relative relocation. */
150 /* GNU extension to record C++ vtable hierarchy. */
165 /* GNU extension to record C++ vtable member usage. */
180 /* This is used only by the dynamic linker. The symbol should exist
181 both in the object being run and in some shared library. The
182 dynamic linker copies the data addressed by the symbol from the
183 shared library into the object, because the object being
184 run has to have the data at some particular address. */
199 /* Like R_CRIS_32, but used when setting global offset table entries. */
214 /* Marks a procedure linkage table entry for a symbol. */
229 /* Used only by the dynamic linker. When the object is run, this
230 longword is set to the load address of the object, plus the
231 addend. */
246 /* Like R_CRIS_32, but referring to the GOT table entry for the symbol. */
275 /* Like R_CRIS_32_GOT, but referring to (and requesting a) PLT part of
276 the GOT table for the symbol. */
305 /* A 32-bit offset from GOT to (local const) symbol: no GOT entry should
306 be necessary. */
321 /* A 32-bit offset from GOT to entry for this symbol in PLT and request
322 to create PLT entry for symbol. */
337 /* A 32-bit offset from PC (location after the relocation) + addend to
338 entry for this symbol in PLT and request to create PLT entry for
339 symbol. */
354 /* We don't handle these in any special manner and cross-format
355 linking is not supported; just recognize them enough to pass them
356 around. FIXME: do the same for most PIC relocs and add sanity
357 tests to actually refuse gracefully to handle these and PIC
358 relocs for cross-format linking. */
359 #define TLSHOWTO32(name) \
360 HOWTO (name, 0, 4, 32, false, 0, complain_overflow_bitfield, \
361 bfd_elf_generic_reloc, #name, false, 0, 0xffffffff, false)
362 #define TLSHOWTO16X(name, X) \
363 HOWTO (name, 0, 2, 16, false, 0, complain_overflow_ ## X, \
364 bfd_elf_generic_reloc, #name, false, 0, 0xffff, false)
365 #define TLSHOWTO16(name) TLSHOWTO16X(name, unsigned)
366 #define TLSHOWTO16S(name) TLSHOWTO16X(name, signed)
380 };
381 \f
382 /* Map BFD reloc types to CRIS ELF reloc types. */
384 struct cris_reloc_map
385 {
386 bfd_reloc_code_real_type bfd_reloc_val;
388 };
391 {
424 };
428 bfd_reloc_code_real_type code)
429 {
437 }
441 {
446 i++)
452 }
454 /* Set the howto pointer for an CRIS ELF reloc. */
456 static bool
460 {
465 {
466 /* xgettext:c-format */
471 }
474 }
476 bfd_reloc_status_type
484 {
485 /* By default (using only bfd_elf_generic_reloc when linking to
486 non-ELF formats) PC-relative relocs are relative to the beginning
487 of the reloc. CRIS PC-relative relocs are relative to the position
488 *after* the reloc because that's what pre-CRISv32 PC points to
489 after reading an insn field with that reloc. (For CRISv32, PC is
490 actually relative to the start of the insn, but we keep the old
491 definition.) Still, we use as much generic machinery as we can.
493 Only adjust when doing a final link. */
497 return
500 }
501 \f
502 /* Support for core dump NOTE sections.
503 The slightly unintuitive code layout is an attempt to keep at least
504 some similarities with other ports, hoping to simplify general
505 changes, while still keeping Linux/CRIS and Linux/CRISv32 code apart. */
507 static bool
509 {
515 {
520 /* pr_cursig */
523 /* pr_pid */
526 /* pr_reg */
531 }
532 else
534 {
539 /* pr_cursig */
542 /* pr_pid */
545 /* pr_reg */
550 }
552 /* Make a ".reg/999" section. */
555 }
557 static bool
559 {
562 {
571 }
572 else
574 {
583 }
585 /* Note that for some reason, a spurious space is tacked
586 onto the end of the args in some (at least one anyway)
587 implementations, so strip it off if it exists. */
589 {
595 }
598 }
599 \f
600 /* The name of the dynamic interpreter. This is put in the .interp
601 section. */
605 /* The size in bytes of an entry in the procedure linkage table. */
607 #define PLT_ENTRY_SIZE 20
608 #define PLT_ENTRY_SIZE_V32 26
610 /* The first entry in an absolute procedure linkage table looks like this. */
613 {
622 };
625 {
636 };
638 /* Subsequent entries in an absolute procedure linkage table look like
639 this. */
642 {
651 };
654 {
665 };
667 /* The first entry in a PIC procedure linkage table looks like this. */
670 {
675 };
678 {
690 };
692 /* Subsequent entries in a PIC procedure linkage table look like this. */
695 {
704 };
707 {
718 };
719 \f
720 /* We copy elf32-m68k.c and elf32-i386.c for the basic linker hash bits
721 (and most other PIC/shlib stuff). Check that we don't drift away
722 without reason.
724 The CRIS linker, like the m68k and i386 linkers (and probably the rest
725 too) needs to keep track of the number of relocs that it decides to
726 copy in check_relocs for each symbol. This is so that it can discard
727 PC relative relocs if it doesn't need them when linking with
728 -Bsymbolic. We store the information in a field extending the regular
729 ELF linker hash table. */
731 /* This structure keeps track of the number of PC relative relocs we have
732 copied for a given symbol. */
734 struct elf_cris_pcrel_relocs_copied
735 {
736 /* Next section. */
739 /* A section in dynobj. */
742 /* Number of relocs copied in this section. */
743 bfd_size_type count;
745 /* Example of reloc being copied, for message. */
747 };
749 /* CRIS ELF linker hash entry. */
751 struct elf_cris_link_hash_entry
752 {
755 /* Number of PC relative relocs copied for this symbol. */
758 /* The GOTPLT references are CRIS-specific; the goal is to avoid having
759 both a general GOT and a PLT-specific GOT entry for the same symbol,
760 when it is referenced both as a function and as a function pointer.
762 Number of GOTPLT references for a function. */
763 bfd_signed_vma gotplt_refcount;
765 /* Actual GOTPLT index for this symbol, if applicable, or zero if not
766 (zero is never used as an index). FIXME: We should be able to fold
767 this with gotplt_refcount in a union, like the got and plt unions in
768 elf_link_hash_entry. */
769 bfd_size_type gotplt_offset;
771 /* The root.got.refcount is the sum of the regular reference counts
772 (this) and those members below. We have to keep a separate count
773 to track when we've found the first (or last) reference to a
774 regular got entry. The offset is in root.got.offset. */
775 bfd_signed_vma reg_got_refcount;
777 /* Similar to the above, the number of reloc references to this
778 symbols that need a R_CRIS_32_TPREL slot. The offset is in
779 root.got.offset, because this and .dtp_refcount can't validly
780 happen when there's also a regular GOT entry; that's invalid
781 input for which an error is emitted. */
782 bfd_signed_vma tprel_refcount;
784 /* Similar to the above, the number of reloc references to this
785 symbols that need a R_CRIS_DTP slot. The offset is in
786 root.got.offset; plus 4 if .tprel_refcount > 0. */
787 bfd_signed_vma dtp_refcount;
788 };
790 static bool
793 static bool
797 /* The local_got_refcounts and local_got_offsets are a multiple of
798 LSNUM in size, namely LGOT_ALLOC_NELTS_FOR(LSNUM) (plus one for the
799 refcount for GOT itself, see code), with the summary / group offset
800 for local symbols located at offset N, reference counts for
801 ordinary (address) relocs at offset N + LSNUM, for R_CRIS_DTP
802 relocs at offset N + 2*LSNUM, and for R_CRIS_32_TPREL relocs at N +
803 3*LSNUM. */
805 #define LGOT_REG_NDX(x) ((x) + symtab_hdr->sh_info)
806 #define LGOT_DTP_NDX(x) ((x) + 2 * symtab_hdr->sh_info)
807 #define LGOT_TPREL_NDX(x) ((x) + 3 * symtab_hdr->sh_info)
808 #define LGOT_ALLOC_NELTS_FOR(x) ((x) * 4)
810 /* CRIS ELF linker hash table. */
812 struct elf_cris_link_hash_table
813 {
816 /* We can't use the PLT offset and calculate to get the GOTPLT offset,
817 since we try and avoid creating GOTPLT:s when there's already a GOT.
818 Instead, we keep and update the next available index here. */
819 bfd_size_type next_gotplt_entry;
821 /* The number of R_CRIS_32_DTPREL and R_CRIS_16_DTPREL that have
822 been seen for any input; if != 0, then the constant-offset
823 R_CRIS_DTPMOD is needed for this DSO/executable. This turns
824 negative at relocation, so that we don't need an extra flag for
825 when the reloc is output. */
826 bfd_signed_vma dtpmod_refcount;
827 };
829 /* Traverse a CRIS ELF linker hash table. */
831 #define elf_cris_link_hash_traverse(table, func, info) \
832 (elf_link_hash_traverse \
833 (&(table)->root, \
834 (bool (*) (struct elf_link_hash_entry *, void *)) (func), \
835 (info)))
837 /* Get the CRIS ELF linker hash table from a link_info structure. */
839 #define elf_cris_hash_table(p) \
840 ((is_elf_hash_table ((p)->hash) \
841 && elf_hash_table_id (elf_hash_table (p)) == CRIS_ELF_DATA) \
842 ? (struct elf_cris_link_hash_table *) (p)->hash : NULL)
844 /* Get the CRIS ELF linker hash entry from a regular hash entry (the
845 "parent class"). The .root reference is just a simple type
846 check on the argument. */
848 #define elf_cris_hash_entry(p) \
849 ((struct elf_cris_link_hash_entry *) (&(p)->root))
851 /* Create an entry in a CRIS ELF linker hash table. */
857 {
861 /* Allocate the structure if it has not already been allocated by a
862 subclass. */
870 /* Call the allocation method of the superclass. */
875 {
882 }
885 }
887 /* Create a CRIS ELF linker hash table. */
891 {
900 elf_cris_link_hash_newfunc,
902 CRIS_ELF_DATA))
903 {
906 }
908 /* Initialize to skip over the first three entries in the gotplt; they
909 are used for run-time symbol evaluation. */
913 }
914 \f
915 /* Perform a single relocation. By default we use the standard BFD
916 routines, with a few tweaks. */
918 static bfd_reloc_status_type
924 bfd_vma relocation)
925 {
926 bfd_reloc_status_type r;
929 /* PC-relative relocations are relative to the position *after*
930 the reloc. Note that for R_CRIS_8_PCREL the adjustment is
931 not a single byte, since PC must be 16-bit-aligned. */
933 {
934 /* Check that the 16-bit GOT relocs are positive. */
944 /* Fall through. */
952 }
958 }
959 \f
961 /* The number of errors left before we stop outputting reloc-specific
962 explanatory messages. By coincidence, this works nicely together
963 with the default number of messages you'll get from LD about
964 "relocation truncated to fit" messages before you get an
965 "additional relocation overflows omitted from the output". */
968 /* Relocate an CRIS ELF section. See elf32-fr30.c, from where this was
969 copied, for further comments. */
971 static int
980 {
1009 {
1012 }
1015 {
1021 bfd_vma relocation;
1022 bfd_reloc_status_type r;
1040 {
1045 symname = (bfd_elf_string_from_elf_section
1049 }
1050 else
1051 {
1063 /* Perhaps we should detect the cases that
1064 sec->output_section is expected to be NULL like i386 and
1065 m68k, but apparently (and according to elfxx-ia64.c) all
1066 valid cases are where the symbol is defined in a shared
1067 object which we link dynamically against. This includes
1068 PLT relocs for which we've created a PLT entry and other
1069 relocs for which we're prepared to create dynamic
1070 relocations.
1072 For now, new situations cause us to just err when
1073 sec->output_offset is NULL but the object with the symbol
1074 is *not* dynamically linked against. Thus this will
1075 automatically remind us so we can see if there are other
1076 valid cases we need to revisit. */
1082 {
1083 /* Here follow the cases where the relocation value must
1084 be zero (or when further handling is simplified when
1085 zero). I can't claim to understand the various
1086 conditions and they weren't described in the files
1087 where I copied them from (elf32-m68k.c and
1088 elf32-i386.c), but let's mention examples of where
1089 they happen. FIXME: Perhaps define and use a
1090 dynamic_symbol_p function like ia64.
1092 - When creating a shared library, we can have an
1093 ordinary relocation for a symbol defined in a shared
1094 library (perhaps the one we create). We then make
1095 the relocation value zero, as the value seen now will
1096 be added into the relocation addend in this shared
1097 library, but must be handled only at dynamic-link
1098 time. FIXME: Not sure this example covers the
1099 h->elf_link_hash_flags test, though it's there in
1100 other targets. */
1114 input_section,
1117 {
1118 _bfd_error_handler
1119 /* xgettext:c-format */
1121 input_bfd,
1122 input_section,
1124 symname);
1127 }
1128 }
1129 }
1142 {
1145 /* This is like the case for R_CRIS_32_GOT and R_CRIS_16_GOT,
1146 but we require a PLT, and the PLT handling will take care of
1147 filling in the PLT-specific GOT entry. For the GOT offset,
1148 calculate it as we do when filling it in for the .got.plt
1149 section. If we don't have a PLT, punt to GOT handling. */
1152 {
1154 bfd_vma got_offset;
1159 got_offset
1164 }
1166 /* We didn't make a PLT entry for this symbol. Maybe everything is
1167 folded into the GOT. Other than folding, this happens when
1168 statically linking PIC code, or when using -Bsymbolic. Check
1169 that we instead have a GOT entry as done for us by
1170 elf_cris_adjust_dynamic_symbol, and drop through into the
1171 ordinary GOT cases. This must not happen for the
1172 executable, because any reference it does to a function
1173 that is satisfied by a DSO must generate a PLT. We assume
1174 these call-specific relocs don't address non-functions. */
1181 {
1182 _bfd_error_handler
1184 /* xgettext:c-format */
1187 /* xgettext:c-format */
1190 input_bfd,
1191 input_section,
1196 /* FIXME: Perhaps blaming input is not the right thing to
1197 do; this is probably an internal error. But it is true
1198 that we didn't like that particular input. */
1201 }
1202 /* Fall through. */
1204 /* The size of the actual relocation is not used here; we only
1205 fill in the GOT table here. */
1208 {
1209 bfd_vma off;
1211 /* Note that despite using RELA relocations, the .got contents
1212 is always filled in with the link-relative relocation
1213 value; the addend. */
1216 {
1228 {
1229 /* This wasn't checked above for ! bfd_link_pic (info), but
1230 must hold there if we get here; the symbol must
1231 be defined in the regular program or be undefweak
1232 or be a function or otherwise need a PLT. */
1240 /* This is actually a static link, or it is a
1241 -Bsymbolic link and the symbol is defined locally,
1242 or is undefweak, or the symbol was forced to be
1243 local because of a version file, or we're not
1244 creating a dynamic object. We must initialize this
1245 entry in the global offset table. Since the offset
1246 must always be a multiple of 4, we use the least
1247 significant bit to record whether we have
1248 initialized it already.
1250 If this GOT entry should be runtime-initialized, we
1251 will create a .rela.got relocation entry to
1252 initialize the value. This is done in the
1253 finish_dynamic_symbol routine. */
1256 else
1257 {
1261 }
1262 }
1263 }
1264 else
1265 {
1271 /* The offset must always be a multiple of 4. We use
1272 the least significant bit to record whether we have
1273 already generated the necessary reloc. */
1276 else
1277 {
1281 {
1282 Elf_Internal_Rela outrel;
1296 }
1299 }
1300 }
1304 {
1305 /* We can't do anything for a relocation which is against
1306 a symbol *plus offset*. GOT holds relocations for
1307 symbols. Make this an error; the compiler isn't
1308 allowed to pass us these kinds of things. */
1310 _bfd_error_handler
1311 /* xgettext:c-format */
1314 input_bfd,
1315 input_section,
1318 else
1319 _bfd_error_handler
1320 /* xgettext:c-format */
1323 input_bfd,
1324 input_section,
1331 }
1332 }
1336 /* This relocation must only be performed against local symbols.
1337 It's also ok when we link a program and the symbol is either
1338 defined in an ordinary (non-DSO) object or is undefined weak. */
1345 {
1346 _bfd_error_handler
1347 /* xgettext:c-format */
1350 input_bfd,
1351 input_section,
1353 symname);
1356 }
1358 /* This can happen if we get a link error with the input ELF
1359 variant mismatching the output variant. Emit an error so
1360 it's noticed if it happens elsewhere. */
1362 {
1363 _bfd_error_handler
1364 /* xgettext:c-format */
1366 input_bfd,
1367 input_section,
1371 }
1373 /* This relocation is like a PC-relative one, except the
1374 reference point is the location of GOT. Note that
1375 sgot->output_offset is not involved in this calculation. We
1376 always want the start of entire .got section, not the
1377 position after the reserved header. */
1382 /* Relocation is to the entry for this symbol in the
1383 procedure linkage table. */
1385 /* Resolve a PLT_PCREL reloc against a local symbol directly,
1386 without using the procedure linkage table. */
1392 {
1393 /* We didn't make a PLT entry for this symbol. This
1394 happens when statically linking PIC code, or when
1395 using -Bsymbolic. */
1397 }
1405 /* Like R_CRIS_32_PLT_PCREL, but the reference point is the
1406 start of the .got section. See also comment at
1407 R_CRIS_32_GOT. */
1410 /* Resolve a PLT_GOTREL reloc against a local symbol directly,
1411 without using the procedure linkage table. */
1417 {
1418 /* We didn't make a PLT entry for this symbol. This
1419 happens when statically linking PIC code, or when
1420 using -Bsymbolic. */
1422 }
1433 /* If the symbol was local, we need no shlib-specific handling. */
1438 /* Fall through. */
1443 && !resolved_to_zero
1451 {
1452 Elf_Internal_Rela outrel;
1456 /* When generating a shared object, these relocations
1457 are copied into the output file to be resolved at run
1458 time. */
1461 {
1462 sreloc = _bfd_elf_get_dynamic_reloc_section
1464 /* The section should have been created in cris_elf_check_relocs,
1465 but that function will not be called for objects which fail in
1466 cris_elf_merge_private_bfd_data. */
1468 {
1471 }
1472 }
1483 /* For now, undefined weak symbols with non-default
1484 visibility (yielding 0), like exception info for
1485 discarded sections, will get a R_CRIS_NONE
1486 relocation rather than no relocation, because we
1487 notice too late that the symbol doesn't need a
1488 relocation. */
1498 /* h->dynindx may be -1 if the symbol was marked to
1499 become local. */
1503 {
1507 }
1508 else
1509 {
1513 {
1516 }
1517 else
1518 {
1524 {
1527 }
1528 else
1529 {
1532 /* We are turning this relocation into one
1533 against a section symbol. It would be
1534 proper to subtract the symbol's value,
1535 osec->vma, from the emitted reloc addend,
1536 but ld.so expects buggy relocs. */
1540 {
1543 }
1545 }
1548 }
1549 }
1555 /* This reloc will be computed at runtime, so there's no
1556 need to do anything now, except for R_CRIS_32 relocations
1557 that have been turned into R_CRIS_RELATIVE. */
1560 }
1566 /* This relocation must only be performed against local
1567 symbols, or to sections that are not loadable. It's also
1568 ok when we link a program and the symbol is defined in an
1569 ordinary (non-DSO) object (if it's undefined there, we've
1570 already seen an error). */
1577 {
1578 _bfd_error_handler
1580 /* We shouldn't get here for GCC-emitted code. */
1581 /* xgettext:c-format */
1584 /* xgettext:c-format */
1586 " not allowed for `%s', a global symbol with default"
1588 input_bfd,
1589 input_section,
1595 }
1600 /* Fill in a R_CRIS_DTPMOD reloc at offset 3 if we haven't
1601 already done so. Note that we do this in .got.plt, not
1602 in .got, as .got.plt contains the first part, still the
1603 reloc is against .got, because the linker script directs
1604 (is required to direct) them both into .got. */
1607 {
1612 {
1613 Elf_Internal_Rela outrel;
1629 }
1630 else
1631 {
1632 /* For an executable, the GOT entry contents is known. */
1635 }
1637 /* Reverse the sign to mark that we've emitted the
1638 required GOT entry. */
1640 }
1642 /* The relocation is the offset from the start of the module
1643 TLS block to the (local) symbol. */
1650 {
1653 /* We've already informed in cris_elf_check_relocs that
1654 this is an error. */
1656 }
1657 /* Fall through. */
1662 {
1663 /* We can't do anything for a relocation which is against a
1664 symbol *plus offset*. The GOT holds relocations for
1665 symbols. Make this an error; the compiler isn't allowed
1666 to pass us these kinds of things. */
1667 _bfd_error_handler
1668 /* xgettext:c-format */
1671 input_bfd,
1672 input_section,
1679 }
1683 {
1684 /* Known contents of the GOT. */
1685 bfd_vma off;
1687 /* The symbol is defined in the program, so just write
1688 (1, known_tpoffset) into the GOT. */
1692 {
1695 }
1696 else
1697 {
1701 }
1703 /* We use bit 1 of the offset as a flag for GOT entry with
1704 the R_CRIS_DTP reloc, setting it when we've emitted the
1705 GOT entry and reloc. Bit 0 is used for R_CRIS_32_TPREL
1706 relocs. */
1708 {
1713 else
1718 }
1719 else
1724 }
1725 else
1726 {
1727 /* Not all parts of the GOT entry are known; emit a real
1728 relocation. */
1729 bfd_vma off;
1734 else
1735 {
1739 }
1741 /* See above re bit 1 and bit 0 usage. */
1743 {
1744 Elf_Internal_Rela outrel;
1751 else
1754 /* Clear the target contents of the GOT (just as a
1755 gesture; it's already cleared on allocation): this
1756 relocation is not like the other dynrelocs. */
1764 {
1767 }
1768 else
1769 {
1772 /* NULL if we had an error. */
1775 }
1784 /* NULL if we had an error. */
1787 }
1788 else
1793 }
1795 /* The GOT-relative offset to the GOT entry is the
1796 relocation, or for R_CRIS_32_GD, the actual address of
1797 the GOT entry. */
1802 {
1805 /* We've already informed in cris_elf_check_relocs that
1806 this is an error. */
1808 }
1809 /* Fall through. */
1814 {
1815 /* We can't do anything for a relocation which is
1816 against a symbol *plus offset*. GOT holds
1817 relocations for symbols. Make this an error; the
1818 compiler isn't allowed to pass us these kinds of
1819 things. */
1820 _bfd_error_handler
1821 /* xgettext:c-format */
1824 input_bfd,
1825 input_section,
1831 }
1835 {
1836 /* Known contents of the GOT. */
1837 bfd_vma off;
1839 /* The symbol is defined in the program, so just write
1840 the -prog_tls_size+known_tpoffset into the GOT. */
1846 else
1849 /* Bit 0 is used to mark whether we've emitted the required
1850 entry (and if needed R_CRIS_32_TPREL reloc). Bit 1
1851 is used similarly for R_CRIS_DTP, see above. */
1853 {
1858 else
1862 }
1863 else
1868 }
1869 else
1870 {
1871 /* Emit a real relocation. */
1872 bfd_vma off;
1876 else
1879 /* See above re usage of bit 0 and 1. */
1881 {
1882 Elf_Internal_Rela outrel;
1889 else
1896 {
1899 }
1900 else
1901 {
1904 /* NULL if we had an error. */
1907 }
1909 /* Just "define" the initial contents in some
1910 semi-logical way. */
1919 /* NULL if we had an error. */
1922 }
1923 else
1928 }
1930 /* The GOT-relative offset to the GOT entry is the relocation,
1931 or for R_CRIS_32_GD, the actual address of the GOT entry. */
1936 /* This relocation must only be performed against symbols
1937 defined in an ordinary (non-DSO) object. */
1939 {
1942 /* We've already informed in cris_elf_check_relocs that
1943 this is an error. */
1945 }
1950 /* If it's undefined, then an error message has already
1951 been emitted. */
1953 {
1954 _bfd_error_handler
1955 /* xgettext:c-format */
1957 " not allowed for symbol: `%s'"
1958 " which is defined outside the program,"
1960 input_bfd,
1961 input_section,
1963 symname);
1966 }
1968 /* NULL if we had an error. */
1974 /* The TLS-relative offset is the relocation. */
1980 }
1986 {
1990 {
1996 {
1997 additional_relocation_error_msg_count--;
1999 {
2003 /* Not just TLS is involved here, so we make
2004 generation and message depend on -fPIC/-fpic
2005 only. */
2008 _bfd_error_handler
2015 _bfd_error_handler
2017 " -msmall-tls: recompile with -fPIC or"
2021 /* No known cause for overflow for other relocs. */
2024 }
2025 }
2048 }
2053 }
2054 }
2057 }
2058 \f
2059 /* Finish up dynamic symbol handling. We set the contents of various
2060 dynamic sections here. */
2062 static bool
2067 {
2070 /* Where in the plt entry to put values. */
2073 /* What offset to add to the distance to the first PLT entry for the
2074 value at plt_off3. */
2077 /* Where in the PLT entry the call-dynlink-stub is (happens to be same
2078 for PIC and non-PIC for v32 and pre-v32). */
2086 /* Adjust the various PLT entry offsets. */
2088 {
2096 }
2099 {
2103 bfd_vma got_base;
2105 bfd_vma gotplt_offset
2107 Elf_Internal_Rela rela;
2111 /* Get the index in the .rela.plt relocations for the .got.plt
2112 entry that corresponds to this symbol.
2113 We have to count backwards here, and the result is only valid
2114 as an index into .rela.plt. We also have to undo the effect
2115 of the R_CRIS_DTPMOD entry at .got index 3 (offset 12 into
2116 .got.plt) for which gotplt_offset is adjusted, because while
2117 that entry goes into .got.plt, its relocation goes into
2118 .rela.got, not .rela.plt. (It's not PLT-specific; not to be
2119 processed as part of the runtime lazy .rela.plt relocation).
2120 FIXME: There be literal constants here... */
2121 bfd_vma rela_plt_index
2125 /* Get the offset into the .got table of the entry that corresponds
2126 to this function. Note that we embed knowledge that "incoming"
2127 .got goes after .got.plt in the output without padding (pointer
2128 aligned). However, that knowledge is present in several other
2129 places too. */
2130 bfd_vma got_offset
2131 = (has_gotplt
2132 ? gotplt_offset
2135 /* This symbol has an entry in the procedure linkage table. Set it
2136 up. */
2148 /* Fill in the entry in the procedure linkage table. */
2150 {
2152 plt_entry_size);
2154 /* We need to enter the absolute address of the GOT entry here. */
2157 }
2158 else
2159 {
2161 plt_entry_size);
2164 }
2166 /* Fill in the plt entry and make a relocation, if this is a "real"
2167 PLT entry. */
2169 {
2170 /* Fill in the offset to the reloc table. */
2175 /* Fill in the offset to the first PLT entry, where to "jump". */
2180 /* Fill in the entry in the global offset table with the address of
2181 the relocating stub. */
2189 /* Fill in the entry in the .rela.plt section. */
2197 }
2200 {
2201 /* Mark the symbol as undefined, rather than as defined in
2202 the .plt section. Leave the value alone. */
2205 /* FIXME: From elf32-sparc.c 2001-02-19 (1.18). I still don't
2206 know whether resetting the value is significant; if it really
2207 is, rather than a quirk or bug in the sparc port, then I
2208 believe we'd see this elsewhere. */
2209 /* If the symbol is weak, we do need to clear the value.
2210 Otherwise, the PLT entry would provide a definition for
2211 the symbol even if the symbol wasn't defined anywhere,
2212 and so the symbol would never be NULL. */
2215 }
2216 }
2218 /* For an ordinary program, we emit .got relocs only for symbols that
2219 are in the dynamic-symbols table and are either defined by the
2220 program or are undefined weak symbols, or are function symbols
2221 where we do not output a PLT: the PLT reloc was output above and all
2222 references to the function symbol are redirected to the PLT. */
2230 {
2233 Elf_Internal_Rela rela;
2237 /* This symbol has an entry in the global offset table. Set it up. */
2247 /* If this is a static link, or it is a -Bsymbolic link and the
2248 symbol is defined locally or was forced to be local because
2249 of a version file, we just want to emit a RELATIVE reloc.
2250 The entry in the global offset table will already have been
2251 initialized in the relocate_section function. */
2257 {
2260 }
2261 else
2262 {
2266 }
2271 }
2274 {
2276 Elf_Internal_Rela rela;
2279 /* This symbol needs a copy reloc. Set it up. */
2287 else
2297 }
2299 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2305 }
2306 \f
2307 /* Finish up the dynamic sections. Do *not* emit relocs here, as their
2308 offsets were changed, as part of -z combreloc handling, from those we
2309 computed. */
2311 static bool
2314 {
2326 {
2336 {
2337 Elf_Internal_Dyn dyn;
2343 {
2353 /* Yes, we *can* have a .plt and no .plt.rela, for instance
2354 if all symbols are found in the .got (not .got.plt). */
2365 else
2369 }
2370 }
2372 /* Fill in the first entry in the procedure linkage table. */
2374 {
2376 {
2379 PLT_ENTRY_SIZE_V32);
2380 else
2381 {
2383 PLT_ENTRY_SIZE_V32);
2391 }
2392 }
2393 else
2394 {
2397 PLT_ENTRY_SIZE);
2398 else
2399 {
2401 PLT_ENTRY_SIZE);
2413 }
2414 }
2415 }
2416 }
2418 /* Fill in the first three entries in the global offset table. */
2420 {
2423 else
2429 }
2434 }
2435 \f
2436 /* Return the section that should be marked against GC for a given
2437 relocation. */
2445 {
2449 {
2456 }
2459 }
2461 /* The elf_backend_plt_sym_val hook function. */
2463 static bfd_vma
2466 {
2467 bfd_size_type plt_entry_size;
2468 bfd_size_type pltoffs;
2471 /* Same for CRIS and CRIS v32; see elf_cris_(|pic_)plt_entry(|_v32)[]. */
2473 bfd_size_type plt_sec_size;
2474 bfd_size_type got_vma_for_dyn;
2477 /* FIXME: the .got section should be readily available also when
2478 we're not linking. */
2483 plt_entry_size
2487 /* Data in PLT is GOT-relative for DYN, but absolute for EXE. */
2490 /* Because we can have merged GOT entries; a single .got entry for
2491 both GOT and the PLT part of the GOT (.got.plt), the index of the
2492 reloc in .rela.plt is not the same as the index in the PLT.
2493 Instead, we have to hunt down the GOT offset in the PLT that
2494 corresponds to that of this reloc. Unfortunately, we will only
2495 be called for the .rela.plt relocs, so we'll miss synthetic
2496 symbols for .plt entries with merged GOT entries. (FIXME:
2497 fixable by providing our own bfd_elf32_get_synthetic_symtab.
2498 Doesn't seem worthwile at time of this writing.) FIXME: we've
2499 gone from O(1) to O(N) (N number of PLT entries) for finding each
2500 PLT address. Shouldn't matter in practice though. */
2505 {
2506 bfd_size_type got_offset;
2517 }
2519 /* While it's tempting to BFD_ASSERT that we shouldn't get here,
2520 that'd not be graceful behavior for invalid input. */
2522 }
2524 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
2525 entry but we found we will not create any. Called when we find we will
2526 not have any PLT for this symbol, by for example
2527 elf_cris_adjust_dynamic_symbol when we're doing a proper dynamic link,
2528 or elf_cris_late_size_sections if no dynamic sections will be
2529 created (we're only linking static objects). */
2531 static bool
2533 {
2536 /* A GOTPLT reloc, when activated, is supposed to be included into
2537 the PLT refcount, when the symbol isn't set-or-forced local. */
2542 /* If nobody wanted a GOTPLT with this symbol, we're done. */
2547 {
2548 /* There's a GOT entry for this symbol. Just adjust the refcounts.
2549 Probably not necessary at this stage, but keeping them accurate
2550 helps avoiding surprises later. */
2554 }
2555 else
2556 {
2557 /* No GOT entry for this symbol. We need to create one. */
2564 /* Put accurate refcounts there. */
2571 /* We always have a .got and a .rela.got section if there were
2572 GOTPLT relocs in input. */
2575 /* Allocate space in the .got section. */
2578 /* Allocate relocation space. */
2580 }
2583 }
2585 /* Try to fold PLT entries with GOT entries. There are two cases when we
2586 want to do this:
2588 - When all PLT references are GOTPLT references, and there are GOT
2589 references, and this is not the executable. We don't have to
2590 generate a PLT at all.
2592 - When there are both (ordinary) PLT references and GOT references,
2593 and this isn't the executable.
2594 We want to make the PLT reference use the ordinary GOT entry rather
2595 than R_CRIS_JUMP_SLOT, a run-time dynamically resolved GOTPLT entry,
2596 since the GOT entry will have to be resolved at startup anyway.
2598 Though the latter case is handled when room for the PLT is allocated,
2599 not here.
2601 By folding into the GOT, we may need a round-trip to a PLT in the
2602 executable for calls, a loss in performance. Still, losing a
2603 reloc is a win in size and at least in start-up time.
2605 Note that this function is called before symbols are forced local by
2606 version scripts. The differing cases are handled by
2607 elf_cris_hide_symbol. */
2609 static bool
2611 {
2614 /* If there are no GOT references for this symbol, we can't fold any
2615 other reference so there's nothing to do. Likewise if there are no
2616 PLT references; GOTPLT references included. */
2620 /* GOTPLT relocs are supposed to be included into the PLT refcount. */
2624 {
2625 /* The only PLT references are GOTPLT references, and there are GOT
2626 references. Convert PLT to GOT references. */
2630 /* Clear the PLT references, so no PLT will be created. */
2632 }
2635 }
2637 /* Our own version of hide_symbol, so that we can adjust a GOTPLT reloc
2638 to use a GOT entry (and create one) rather than requiring a GOTPLT
2639 entry. */
2641 static void
2645 {
2649 }
2651 /* Adjust a symbol defined by a dynamic object and referenced by a
2652 regular object. The current definition is in some section of the
2653 dynamic object, but we're not including those sections. We have to
2654 change the definition to something the rest of the link can
2655 understand. */
2657 static bool
2660 {
2665 bfd_size_type plt_entry_size;
2673 /* Make sure we know what is going on here. */
2681 plt_entry_size
2685 /* If this is a function, put it in the procedure linkage table. We
2686 will fill in the contents of the procedure linkage table later,
2687 when we know the address of the .got section. */
2690 {
2691 /* If we link a program (not a DSO), we'll get rid of unnecessary
2692 PLT entries; we point to the actual symbols -- even for pic
2693 relocs, because a program built with -fpic should have the same
2694 result as one built without -fpic, specifically considering weak
2695 symbols.
2696 FIXME: m68k and i386 differ here, for unclear reasons. */
2699 {
2700 /* This case can occur if we saw a PLT reloc in an input file,
2701 but the symbol was not defined by a dynamic object. In such
2702 a case, we don't actually need to build a procedure linkage
2703 table, and we can just do an absolute or PC reloc instead, or
2704 change a .got.plt index to a .got index for GOTPLT relocs. */
2708 return
2711 info);
2712 }
2714 /* If we had a R_CRIS_GLOB_DAT that didn't have to point to a PLT;
2715 where a pointer-equivalent symbol was unimportant (i.e. more
2716 like R_CRIS_JUMP_SLOT after symbol evaluation) we could get rid
2717 of the PLT. We can't for the executable, because the GOT
2718 entries will point to the PLT there (and be constant). */
2724 /* GC or folding may have rendered this entry unused. */
2726 {
2730 }
2732 /* Make sure this symbol is output as a dynamic symbol. */
2734 {
2737 }
2742 /* If this is the first .plt entry, make room for the special
2743 first entry. */
2747 /* If this symbol is not defined in a regular file, and we are
2748 not generating a shared library, then set the symbol to this
2749 location in the .plt. */
2752 {
2755 }
2757 /* If there's already a GOT entry, use that, not a .got.plt. A
2758 GOT field still has a reference count when we get here; it's
2759 not yet changed to an offset. We can't do this for an
2760 executable, because then the reloc associated with the PLT
2761 would get a non-PLT reloc pointing to the PLT. FIXME: Move
2762 this to elf_cris_try_fold_plt_to_got. */
2764 {
2767 /* Mark the PLT offset to use the GOT entry by setting the low
2768 bit in the plt offset; it is always a multiple of
2769 plt_entry_size (which is at least a multiple of 2). */
2772 /* Change the PLT refcount to an offset. */
2775 /* By not setting gotplt_offset (i.e. it remains at 0), we signal
2776 that the got entry should be used instead. */
2780 /* Make room for this entry. */
2784 }
2786 /* No GOT reference for this symbol; prepare for an ordinary PLT. */
2789 /* Make room for this entry. */
2792 /* We also need to make an entry in the .got.plt section, which
2793 will be placed in the .got section by the linker script. */
2802 /* We also need to make an entry in the .rela.plt section. */
2809 }
2811 /* Reinitialize the plt offset now that it is not used as a reference
2812 count any more. */
2815 /* If this is a weak symbol, and there is a real definition, the
2816 processor independent code will have arranged for us to see the
2817 real definition first, and we can just use the same value. */
2819 {
2825 }
2827 /* This is a reference to a symbol defined by a dynamic object which
2828 is not a function. */
2830 /* If we are creating a shared library, we must presume that the
2831 only references to the symbol are via the global offset table.
2832 For such cases we need not do anything here; the relocations will
2833 be handled correctly by relocate_section. */
2837 /* If there are no references to this symbol that do not use the
2838 GOT, we don't need to generate a copy reloc. */
2842 /* We must allocate the symbol in our .dynbss section, which will
2843 become part of the .bss section of the executable. There will be
2844 an entry for this symbol in the .dynsym section. The dynamic
2845 object will contain position independent code, so all references
2846 from the dynamic object to this symbol will go through the global
2847 offset table. The dynamic linker will use the .dynsym entry to
2848 determine the address it must put in the global offset table, so
2849 both the dynamic object and the regular object will refer to the
2850 same memory location for the variable. */
2852 /* We must generate a R_CRIS_COPY reloc to tell the dynamic linker to
2853 copy the initial value out of the dynamic object and into the
2854 runtime process image. We need to remember the offset into the
2855 .rela.bss section we are going to use. */
2858 {
2861 }
2862 else
2863 {
2866 }
2868 {
2872 }
2877 }
2879 /* Adjust our "subclass" elements for an indirect symbol. */
2881 static void
2885 {
2891 /* Only indirect symbols are replaced; we're not interested in
2892 updating any of EIND's fields for other symbols. */
2894 {
2895 /* Still, we need to copy flags for e.g. weak definitions. */
2898 }
2902 #define XMOVOPZ(F, OP, Z) edir->F OP eind->F; eind->F = Z
2903 #define XMOVE(F) XMOVOPZ (F, +=, 0)
2905 {
2907 {
2911 /* Add reloc counts against the indirect sym to the direct sym
2912 list. Merge any entries against the same section. */
2914 {
2919 {
2923 }
2926 }
2928 }
2930 }
2936 #undef XMOVE
2937 #undef XMOVOPZ
2940 }
2942 /* Look through the relocs for a section during the first phase. */
2944 static bool
2949 {
2979 {
2988 {
2991 }
2992 else
2993 {
2998 }
3002 /* Some relocs require linker-created sections; we need to hang them
3003 on the first input bfd we found that contained dynamic relocs. */
3005 {
3008 /* This'd be a .dtpreld entry in e.g. debug info. We have
3009 several different switch statements below, but none of
3010 that is needed; we need no preparations for resolving
3011 R_CRIS_32_DTPREL into a non-allocated section (debug
3012 info), so let's just move on to the next
3013 relocation. */
3015 /* Fall through. */
3017 /* The first .got.plt entry is right after the R_CRIS_DTPMOD
3018 entry at index 3. */
3023 /* Fall through. */
3039 {
3042 /* We could handle this if we can get a handle on the
3043 output bfd in elf_cris_adjust_dynamic_symbol. Failing
3044 that, we must insist on dynobj being a specific mach. */
3046 {
3047 _bfd_error_handler
3048 /* xgettext:c-format */
3053 }
3054 }
3057 {
3058 /* We may have a dynobj but no .got section, if machine-
3059 independent parts of the linker found a reason to create
3060 a dynobj. We want to create the .got section now, so we
3061 can assume it's always present whenever there's a dynobj.
3062 It's ok to call this function more than once. */
3068 }
3071 {
3072 bfd_size_type amt;
3074 /* We use index local_got_refcounts[-1] to count all
3075 GOT-relative relocations that do not have explicit
3076 GOT entries. */
3083 local_got_refcounts++;
3085 }
3090 }
3092 /* Warn and error for invalid input. */
3094 {
3100 {
3101 _bfd_error_handler
3102 /* xgettext:c-format */
3104 " in a shared object;"
3106 abfd,
3107 sec,
3109 /* Don't return FALSE here; we want messages for all of
3110 these and the error behavior is ungraceful
3111 anyway. */
3112 }
3115 }
3118 {
3122 /* These are requests for tls_index entries, run-time R_CRIS_DTP. */
3129 /* These two just request for the constant-index
3130 module-local tls_index-sized GOT entry, which we add
3131 elsewhere. */
3139 /* Those relocs also require that a DSO is of type
3140 Initial Exec. Like other targets, we don't reset this
3141 flag even if the relocs are GC:ed away. */
3146 /* Let's list the other assembler-generated TLS-relocs too,
3147 just to show that they're not forgotten. */
3152 }
3155 {
3158 /* Mark that we need a GOT entry if the PLT entry (and its GOT
3159 entry) is eliminated. We can only do this for a non-local
3160 symbol. */
3162 {
3165 }
3166 /* If h is NULL then this is a local symbol, and we must make a
3167 GOT entry for it, so handle it like a GOT reloc. */
3168 /* Fall through. */
3178 /* This symbol requires a global offset table entry. */
3180 {
3182 {
3183 /* Make sure this symbol is output as a dynamic symbol. */
3185 {
3188 }
3189 }
3191 /* Update the sum of reloc counts for this symbol. */
3195 {
3199 {
3200 /* Allocate space in the .got section. */
3202 /* Allocate relocation space. */
3204 }
3212 {
3213 /* Allocate space in the .got section. */
3215 /* Allocate relocation space. */
3217 }
3225 {
3226 /* Allocate space in the .got section. */
3228 /* Allocate relocation space. */
3230 }
3237 }
3238 }
3239 else
3240 {
3241 /* This is a global offset table entry for a local symbol. */
3243 {
3246 {
3247 /* If we are generating a shared object, we need
3248 to output a R_CRIS_RELATIVE reloc so that the
3249 dynamic linker can adjust this GOT entry.
3250 Similarly for non-regular got entries. */
3252 }
3253 }
3254 /* Update the reloc-specific count. */
3257 /* This one is the sum of all the others. */
3259 }
3265 /* This reference requires a global offset table.
3266 FIXME: The actual refcount isn't used currently; the .got
3267 section can't be removed if there were any references in the
3268 input. */
3272 handle_gotplt_reloc:
3275 /* This reference requires a global offset table. */
3277 /* Fall through. */
3280 /* This symbol requires a procedure linkage table entry. We
3281 actually build the entry in adjust_dynamic_symbol,
3282 because this might be a case of linking PIC code which is
3283 never referenced by a dynamic object, in which case we
3284 don't need to generate a procedure linkage table entry
3285 after all. */
3287 /* Beware: if we'd check for visibility of the symbol here
3288 (and not marking the need for a PLT when non-visible), we'd
3289 get into trouble with keeping handling consistent with
3290 regards to relocs found before definition and GOTPLT
3291 handling. Eliminable PLT entries will be dealt with later
3292 anyway. */
3298 /* If the symbol is forced local, the refcount is unavailable. */
3306 /* Let's help debug shared library creation. Any of these
3307 relocs *can* be used in shared libs, but pages containing
3308 them cannot be shared, so they're not appropriate for
3309 common use. Don't warn for sections we don't care about,
3310 such as debug sections or non-constant sections. We
3311 can't help tables of (global) function pointers, for
3312 example, though they must be emitted in a (writable) data
3313 section to avoid having impure text sections. */
3317 {
3318 /* FIXME: How do we make this optionally a warning only? */
3319 _bfd_error_handler
3320 /* xgettext:c-format */
3323 abfd,
3324 sec,
3326 }
3328 /* We don't need to handle relocs into sections not going into
3329 the "real" output. */
3334 {
3337 /* Make sure a plt entry is created for this symbol if it
3338 turns out to be a function defined by a dynamic object. */
3341 }
3343 /* If we are creating a shared library and this is not a local
3344 symbol, we need to copy the reloc into the shared library.
3345 However when linking with -Bsymbolic and this is a global
3346 symbol which is defined in an object we are including in the
3347 link (i.e., DEF_REGULAR is set), then we can resolve the
3348 reloc directly. At this point we have not seen all the input
3349 files, so it is possible that DEF_REGULAR is not set now but
3350 will be set later (it is never cleared). In case of a weak
3351 definition, DEF_REGULAR may be cleared later by a strong
3352 definition in a shared library. We account for that
3353 possibility below by storing information in the relocs_copied
3354 field of the hash table entry. A similar situation occurs
3355 when creating shared libraries and symbol visibility changes
3356 render the symbol local. */
3358 /* No need to do anything if we're not creating a shared object. */
3363 /* We may need to create a reloc section in the dynobj and made room
3364 for this reloc. */
3366 {
3367 sreloc = _bfd_elf_make_dynamic_reloc_section
3372 }
3384 {
3387 /* Make sure a plt entry is created for this symbol if it
3388 turns out to be a function defined by a dynamic object. */
3391 }
3393 /* If we are creating a shared library and this is not a local
3394 symbol, we need to copy the reloc into the shared library.
3395 However when linking with -Bsymbolic and this is a global
3396 symbol which is defined in an object we are including in the
3397 link (i.e., DEF_REGULAR is set), then we can resolve the
3398 reloc directly. At this point we have not seen all the input
3399 files, so it is possible that DEF_REGULAR is not set now but
3400 will be set later (it is never cleared). In case of a weak
3401 definition, DEF_REGULAR may be cleared later by a strong
3402 definition in a shared library. We account for that
3403 possibility below by storing information in the relocs_copied
3404 field of the hash table entry. A similar situation occurs
3405 when creating shared libraries and symbol visibility changes
3406 render the symbol local. */
3408 /* No need to do anything if we're not creating a shared object. */
3412 /* We don't need to handle relocs into sections not going into
3413 the "real" output. */
3417 /* If the symbol is local, then we know already we can
3418 eliminate the reloc. */
3422 /* If this is with -Bsymbolic and the symbol isn't weak, and
3423 is defined by an ordinary object (the ones we include in
3424 this shared library) then we can also eliminate the
3425 reloc. See comment above for more eliminable cases which
3426 we can't identify at this time. */
3432 /* We may need to create a reloc section in the dynobj and made room
3433 for this reloc. */
3435 {
3436 sreloc = _bfd_elf_make_dynamic_reloc_section
3441 }
3445 /* We count the number of PC relative relocations we have
3446 entered for this symbol, so that we can discard them
3447 again if the symbol is later defined by a regular object.
3448 We know that h is really a pointer to an
3449 elf_cris_link_hash_entry. */
3450 {
3461 {
3471 }
3474 }
3477 /* This relocation describes the C++ object vtable hierarchy.
3478 Reconstruct it for later use during GC. */
3484 /* This relocation describes which C++ vtable entries are actually
3485 used. Record for later use during GC. */
3493 /* Already warned above, when necessary. */
3497 /* Other relocs do not appear here. */
3500 }
3501 }
3504 }
3506 /* Set the sizes of the dynamic sections. */
3508 static bool
3511 {
3526 {
3527 /* Set the contents of the .interp section to the interpreter. */
3529 {
3534 }
3535 }
3536 else
3537 {
3538 /* Adjust all expected GOTPLT uses to use a GOT entry instead. */
3540 info);
3542 /* We may have created entries in the .rela.got section.
3543 However, if we are not creating the dynamic sections, we will
3544 not actually use these entries. Reset the size of .rela.got,
3545 which will cause it to get stripped from the output file
3546 below. */
3550 }
3552 /* If this is a -Bsymbolic shared link, then we need to discard all PC
3553 relative relocs against symbols defined in a regular object. We
3554 allocated space for them in the check_relocs routine, but we will not
3555 fill them in in the relocate_section routine. We also discard space
3556 for relocs that have become for local symbols due to symbol
3557 visibility changes. For programs, we discard space for relocs for
3558 symbols not referenced by any dynamic object. */
3561 elf_cris_discard_excess_dso_dynamics,
3562 info);
3563 else
3565 elf_cris_discard_excess_program_dynamics,
3566 info);
3568 /* The check_relocs and adjust_dynamic_symbol entry points have
3569 determined the sizes of the various dynamic sections. Allocate
3570 memory for them. */
3573 {
3579 /* It's OK to base decisions on the section name, because none
3580 of the dynobj section names depend upon the input files. */
3584 {
3585 ;
3586 }
3588 {
3589 /* The .got.plt contains the .got header as well as the
3590 actual .got.plt contents. The .got header may contain a
3591 R_CRIS_DTPMOD entry at index 3. */
3594 }
3596 {
3603 {
3604 /* Remember whether there are any reloc sections other
3605 than .rela.plt. */
3609 /* We use the reloc_count field as a counter if we need
3610 to copy relocs into the output file. */
3612 }
3613 }
3617 {
3618 /* It's not one of our sections, so don't allocate space. */
3620 }
3623 {
3624 /* If we don't need this section, strip it from the
3625 output file. This is mostly to handle .rela.bss and
3626 .rela.plt. We must create both sections in
3627 create_dynamic_sections, because they must be created
3628 before the linker maps input sections to output
3629 sections. The linker does that before
3630 adjust_dynamic_symbol is called, and it is that
3631 function which decides whether anything needs to go
3632 into these sections. */
3635 }
3640 /* Allocate memory for the section contents. We use bfd_zalloc here
3641 in case unused entries are not reclaimed before the section's
3642 contents are written out. This should not happen, but this way
3643 if it does, we will not write out garbage. For reloc sections,
3644 this will make entries have the type R_CRIS_NONE. */
3648 }
3651 }
3653 /* This function is called via elf_cris_link_hash_traverse if we are
3654 creating a shared object. In the -Bsymbolic case, it discards the
3655 space allocated to copy PC relative relocs against symbols which
3656 are defined in regular objects. For the normal non-symbolic case,
3657 we also discard space for relocs that have become local due to
3658 symbol visibility changes. We allocated space for them in the
3659 check_relocs routine, but we won't fill them in in the
3660 relocate_section routine. */
3662 static bool
3665 {
3669 /* If a symbol has been forced local or we have found a regular
3670 definition for the symbolic link case, then we won't be needing
3671 any relocs. */
3675 {
3677 {
3678 asection *sreloc
3684 }
3686 }
3688 /* If we have accounted for PC-relative relocs for read-only
3689 sections, now is the time to warn for them. We can't do it in
3690 cris_elf_check_relocs, because we don't know the status of all
3691 symbols at that time (and it's common to force symbols local
3692 late). */
3696 {
3697 /* FIXME: How do we make this optionally a warning only? */
3698 _bfd_error_handler
3699 /* xgettext:c-format */
3701 " relocation %s should not be used"
3709 }
3712 }
3714 /* This function is called via elf_cris_link_hash_traverse if we are *not*
3715 creating a shared object. We discard space for relocs for symbols put
3716 in the .got, but which we found we do not have to resolve at run-time. */
3718 static bool
3721 {
3724 /* If we're not creating a shared library and have a symbol which is
3725 referred to by .got references, but the symbol is defined locally,
3726 (or rather, not defined by a DSO) then lose the reloc for the .got
3727 (don't allocate room for it). Likewise for relocs for something
3728 for which we create a PLT. */
3731 {
3733 /* The size of this section is only valid and in sync with the
3734 various reference counts if we do dynamic; don't decrement it
3735 otherwise. */
3737 {
3745 }
3747 /* If the locally-defined symbol isn't used by a DSO, then we don't
3748 have to export it as a dynamic symbol. This was already done for
3749 functions; doing this for all symbols would presumably not
3750 introduce new problems. Of course we don't do this if we're
3751 exporting all dynamic symbols, or all data symbols, regardless of
3752 them being referenced or not. */
3759 {
3763 }
3764 }
3767 }
3769 /* Reject a file depending on presence and expectation of prefixed
3770 underscores on symbols. */
3772 static bool
3774 {
3780 else
3782 }
3784 /* Mark presence or absence of leading underscore. Set machine type
3785 flags from mach type. */
3787 static bool
3789 {
3797 {
3813 }
3817 }
3819 /* Set the mach type from e_flags value. */
3821 static bool
3824 {
3826 {
3840 /* Since we don't recognize them, we obviously can't support them
3841 with this code; we'd have to require that all future handling
3842 would be optional. */
3845 }
3848 }
3850 /* Display the flags field. */
3852 static bool
3854 {
3874 }
3876 /* Don't mix files with and without a leading underscore. */
3878 static bool
3880 {
3894 {
3895 /* This happens when ld starts out with a 'blank' output file. */
3898 /* We ignore the linker-set mach, and instead set it according to
3899 the first input file. This would also happen if we could
3900 somehow filter out the OUTPUT_ARCH () setting from elf.sc.
3901 This allows us to keep the same linker config across
3902 cris(v0..v10) and crisv32. The drawback is that we can't force
3903 the output type, which might be a sane thing to do for a
3904 v10+v32 compatibility object. */
3907 }
3911 {
3912 _bfd_error_handler
3916 ibfd);
3919 }
3924 {
3925 /* We can get an incompatible combination only if either is
3926 bfd_mach_cris_v32, and the other one isn't compatible. */
3931 {
3932 _bfd_error_handler
3938 ibfd);
3941 }
3943 /* We don't have to check the case where the input is compatible
3944 with v10 and v32, because the output is already known to be set
3945 to the other (compatible) mach. */
3949 }
3952 }
3954 /* Do side-effects of e_flags copying to obfd. */
3956 static bool
3958 {
3963 /* Call the base function. */
3967 /* Do what we really came here for. */
3969 }
3971 static enum elf_reloc_type_class
3975 {
3978 {
3987 }
3988 }
3990 /* The elf_backend_got_elt_size worker. For one symbol, we can have up to
3991 two GOT entries from three types with two different sizes. We handle
3992 it as a single entry, so we can use the regular offset-calculation
3993 machinery. */
3995 static bfd_vma
4001 {
4005 /* We may have one regular GOT entry or up to two TLS GOT
4006 entries. */
4008 {
4015 {
4016 /* We can't have a variable referred to both as a regular
4017 variable and through TLS relocs. */
4021 }
4028 }
4029 else
4030 {
4033 {
4034 /* The actual error-on-input is emitted elsewhere. */
4037 }
4044 }
4046 /* We're only called when h->got.refcount is non-zero, so we must
4047 have a non-zero size. */
4050 }
4051 \f
4052 #define ELF_ARCH bfd_arch_cris
4053 #define ELF_TARGET_ID CRIS_ELF_DATA
4054 #define ELF_MACHINE_CODE EM_CRIS
4055 #define ELF_MAXPAGESIZE 0x2000
4057 #define TARGET_LITTLE_SYM cris_elf32_vec
4059 #define elf_symbol_leading_char 0
4061 #define elf_info_to_howto_rel NULL
4062 #define elf_info_to_howto cris_info_to_howto_rela
4063 #define elf_backend_relocate_section cris_elf_relocate_section
4064 #define elf_backend_gc_mark_hook cris_elf_gc_mark_hook
4065 #define elf_backend_plt_sym_val cris_elf_plt_sym_val
4066 #define elf_backend_check_relocs cris_elf_check_relocs
4067 #define elf_backend_grok_prstatus cris_elf_grok_prstatus
4068 #define elf_backend_grok_psinfo cris_elf_grok_psinfo
4070 #define elf_backend_can_gc_sections 1
4071 #define elf_backend_can_refcount 1
4073 #define elf_backend_object_p cris_elf_object_p
4074 #define elf_backend_final_write_processing \
4075 cris_elf_final_write_processing
4076 #define bfd_elf32_bfd_print_private_bfd_data \
4077 cris_elf_print_private_bfd_data
4078 #define bfd_elf32_bfd_merge_private_bfd_data \
4079 cris_elf_merge_private_bfd_data
4080 #define bfd_elf32_bfd_copy_private_bfd_data \
4081 cris_elf_copy_private_bfd_data
4083 #define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup
4084 #define bfd_elf32_bfd_reloc_name_lookup cris_reloc_name_lookup
4086 #define bfd_elf32_bfd_link_hash_table_create \
4087 elf_cris_link_hash_table_create
4088 #define elf_backend_adjust_dynamic_symbol \
4089 elf_cris_adjust_dynamic_symbol
4090 #define elf_backend_copy_indirect_symbol \
4091 elf_cris_copy_indirect_symbol
4092 #define elf_backend_late_size_sections \
4093 elf_cris_late_size_sections
4094 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4095 #define elf_backend_finish_dynamic_symbol \
4096 elf_cris_finish_dynamic_symbol
4097 #define elf_backend_finish_dynamic_sections \
4098 elf_cris_finish_dynamic_sections
4099 #define elf_backend_create_dynamic_sections \
4100 _bfd_elf_create_dynamic_sections
4101 #define bfd_elf32_bfd_final_link \
4102 bfd_elf_gc_common_final_link
4103 #define elf_backend_hide_symbol elf_cris_hide_symbol
4104 #define elf_backend_reloc_type_class elf_cris_reloc_type_class
4106 #define elf_backend_want_got_plt 1
4107 #define elf_backend_plt_readonly 1
4108 #define elf_backend_want_plt_sym 0
4109 #define elf_backend_got_header_size 12
4110 #define elf_backend_got_elt_size elf_cris_got_elt_size
4111 #define elf_backend_dtrel_excludes_plt 1
4112 #define elf_backend_want_dynrelro 1
4114 #define elf_backend_default_execstack 0
4116 /* Later, we my want to optimize RELA entries into REL entries for dynamic
4117 linking and libraries (if it's a win of any significance). Until then,
4118 take the easy route. */
4119 #define elf_backend_may_use_rel_p 0
4120 #define elf_backend_may_use_rela_p 1
4121 #define elf_backend_rela_normal 1
4123 #define elf_backend_linux_prpsinfo32_ugid16 true
4127 #undef TARGET_LITTLE_SYM
4128 #undef TARGET_LITTLE_NAME
4129 #undef elf_symbol_leading_char
4131 #define TARGET_LITTLE_SYM cris_elf32_us_vec
4134 #undef elf32_bed
4135 #define elf32_bed elf32_us_cris_bed