| blob | 41b5909bad4fa3bdf82e2bef39cad98d9b93c605 |
1 /* MIPS-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
5 Most of the information added by Ian Lance Taylor, Cygnus Support,
6 <ian@cygnus.com>.
7 N32/64 ABI support added by Mark Mitchell, CodeSourcery, LLC.
8 <mark@codesourcery.com>
9 Traditional MIPS targets support added by Koundinya.K, Dansk Data
10 Elektronik & Operations Research Group. <kk@ddeorg.soft.net>
12 This file is part of BFD, the Binary File Descriptor library.
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 2 of the License, or
17 (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
24 You should have received a copy of the GNU General Public License
25 along with this program; if not, write to the Free Software
26 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
28 /* This file handles MIPS ELF targets. SGI Irix 5 uses a slightly
29 different MIPS ELF from other targets. This matters when linking.
30 This file supports both, switching at runtime. */
40 /* Get the ECOFF swapping routines. */
46 #define ECOFF_SIGNED_32
49 /* This structure is used to hold .got information when linking. It
50 is stored in the tdata field of the bfd_elf_section_data structure. */
52 struct mips_got_info
53 {
54 /* The global symbol in the GOT with the lowest index in the dynamic
55 symbol table. */
57 /* The number of global .got entries. */
59 /* The number of local .got entries. */
61 /* The number of local .got entries we have used. */
63 };
65 /* The MIPS ELF linker needs additional information for each symbol in
66 the global hash table. */
68 struct mips_elf_link_hash_entry
69 {
72 /* External symbol information. */
73 EXTR esym;
75 /* Number of R_MIPS_32, R_MIPS_REL32, or R_MIPS_64 relocs against
76 this symbol. */
79 /* If the R_MIPS_32, R_MIPS_REL32, or R_MIPS_64 reloc is against
80 a readonly section. */
81 boolean readonly_reloc;
83 /* The index of the first dynamic relocation (in the .rel.dyn
84 section) against this symbol. */
87 /* We must not create a stub for a symbol that has relocations
88 related to taking the function's address, i.e. any but
89 R_MIPS_CALL*16 ones -- see "MIPS ABI Supplement, 3rd Edition",
90 p. 4-20. */
91 boolean no_fn_stub;
93 /* If there is a stub that 32 bit functions should use to call this
94 16 bit function, this points to the section containing the stub. */
97 /* Whether we need the fn_stub; this is set if this symbol appears
98 in any relocs other than a 16 bit call. */
99 boolean need_fn_stub;
101 /* If there is a stub that 16 bit functions should use to call this
102 32 bit function, this points to the section containing the stub. */
105 /* This is like the call_stub field, but it is used if the function
106 being called returns a floating point value. */
108 };
110 static bfd_reloc_status_type mips32_64bit_reloc
116 static void mips_info_to_howto_rel
118 static void mips_info_to_howto_rela
120 static void bfd_mips_elf32_swap_gptab_in
122 static void bfd_mips_elf32_swap_gptab_out
124 #if 0
125 static void bfd_mips_elf_swap_msym_in
127 #endif
128 static void bfd_mips_elf_swap_msym_out
131 static boolean mips_elf_create_procedure_table
137 static boolean mips_elf_is_local_label_name
142 static bfd_reloc_status_type mips16_jump_reloc
144 static bfd_reloc_status_type mips16_gprel_reloc
146 static boolean mips_elf_create_compact_rel_section
148 static boolean mips_elf_create_got_section
150 static bfd_reloc_status_type mips_elf_final_gp
157 static void mips_elf_irix6_finish_dynamic_symbol
164 static bfd_vma mips_elf_global_got_index
166 static bfd_vma mips_elf_local_got_index
168 static bfd_vma mips_elf_got_offset_from_index
170 static boolean mips_elf_record_global_got_symbol
173 static bfd_vma mips_elf_got_page
178 static bfd_reloc_status_type mips_elf_calculate_relocation
182 boolean *));
183 static bfd_vma mips_elf_obtain_contents
185 static boolean mips_elf_perform_relocation
190 static boolean mips_elf_sort_hash_table_f
192 static boolean mips_elf_sort_hash_table
197 static boolean mips_elf_local_relocation_p
199 static bfd_vma mips_elf_create_local_got_entry
201 static bfd_vma mips_elf_got16_entry
203 static boolean mips_elf_create_dynamic_relocation
207 static void mips_elf_allocate_dynamic_relocations
209 static boolean mips_elf_stub_section_p
211 static int sort_dynamic_relocs
213 static void _bfd_mips_elf_hide_symbol
215 static void _bfd_mips_elf_copy_indirect_symbol
218 static boolean _bfd_elf32_mips_grok_prstatus
220 static boolean _bfd_elf32_mips_grok_psinfo
222 static boolean _bfd_elf32_mips_discard_info
224 static boolean _bfd_elf32_mips_ignore_discarded_relocs
226 static boolean _bfd_elf32_mips_write_section
231 #ifdef BFD64
234 #endif
236 /* The level of IRIX compatibility we're striving for. */
239 ict_none,
240 ict_irix5,
241 ict_irix6
244 /* This will be used when we sort the dynamic relocation records. */
247 /* Nonzero if ABFD is using the N32 ABI. */
249 #define ABI_N32_P(abfd) \
250 ((elf_elfheader (abfd)->e_flags & EF_MIPS_ABI2) != 0)
252 /* Nonzero if ABFD is using the 64-bit ABI. */
253 #define ABI_64_P(abfd) \
254 ((elf_elfheader (abfd)->e_ident[EI_CLASS] == ELFCLASS64) != 0)
256 /* Depending on the target vector we generate some version of Irix
257 executables or "normal" MIPS ELF ABI executables. */
258 #ifdef BFD64
259 #define IRIX_COMPAT(abfd) \
260 (((abfd->xvec == &bfd_elf64_tradbigmips_vec) || \
261 (abfd->xvec == &bfd_elf64_tradlittlemips_vec) || \
262 (abfd->xvec == &bfd_elf32_tradbigmips_vec) || \
263 (abfd->xvec == &bfd_elf32_tradlittlemips_vec)) ? ict_none : \
264 ((ABI_N32_P (abfd) || ABI_64_P (abfd)) ? ict_irix6 : ict_irix5))
265 #else
266 #define IRIX_COMPAT(abfd) \
267 (((abfd->xvec == &bfd_elf32_tradbigmips_vec) || \
268 (abfd->xvec == &bfd_elf32_tradlittlemips_vec)) ? ict_none : \
269 ((ABI_N32_P (abfd) || ABI_64_P (abfd)) ? ict_irix6 : ict_irix5))
270 #endif
272 #define NEWABI_P(abfd) (ABI_N32_P(abfd) || ABI_64_P(abfd))
274 /* Whether we are trying to be compatible with IRIX at all. */
275 #define SGI_COMPAT(abfd) \
276 (IRIX_COMPAT (abfd) != ict_none)
278 /* The name of the msym section. */
281 /* The name of the srdata section. */
284 /* The name of the options section. */
285 #define MIPS_ELF_OPTIONS_SECTION_NAME(abfd) \
288 /* The name of the stub section. */
289 #define MIPS_ELF_STUB_SECTION_NAME(abfd) \
292 /* The name of the dynamic relocation section. */
295 /* The size of an external REL relocation. */
296 #define MIPS_ELF_REL_SIZE(abfd) \
297 (get_elf_backend_data (abfd)->s->sizeof_rel)
299 /* The size of an external dynamic table entry. */
300 #define MIPS_ELF_DYN_SIZE(abfd) \
301 (get_elf_backend_data (abfd)->s->sizeof_dyn)
303 /* The size of a GOT entry. */
304 #define MIPS_ELF_GOT_SIZE(abfd) \
305 (get_elf_backend_data (abfd)->s->arch_size / 8)
307 /* The size of a symbol-table entry. */
308 #define MIPS_ELF_SYM_SIZE(abfd) \
309 (get_elf_backend_data (abfd)->s->sizeof_sym)
311 /* The default alignment for sections, as a power of two. */
312 #define MIPS_ELF_LOG_FILE_ALIGN(abfd) \
313 (get_elf_backend_data (abfd)->s->file_align == 8 ? 3 : 2)
315 /* Get word-sized data. */
316 #define MIPS_ELF_GET_WORD(abfd, ptr) \
317 (ABI_64_P (abfd) ? bfd_get_64 (abfd, ptr) : bfd_get_32 (abfd, ptr))
319 /* Put out word-sized data. */
320 #define MIPS_ELF_PUT_WORD(abfd, val, ptr) \
321 (ABI_64_P (abfd) \
322 ? bfd_put_64 (abfd, val, ptr) \
323 : bfd_put_32 (abfd, val, ptr))
325 /* Add a dynamic symbol table-entry. */
326 #ifdef BFD64
327 #define MIPS_ELF_ADD_DYNAMIC_ENTRY(info, tag, val) \
328 (ABI_64_P (elf_hash_table (info)->dynobj) \
329 ? bfd_elf64_add_dynamic_entry (info, (bfd_vma) tag, (bfd_vma) val) \
330 : bfd_elf32_add_dynamic_entry (info, (bfd_vma) tag, (bfd_vma) val))
331 #else
332 #define MIPS_ELF_ADD_DYNAMIC_ENTRY(info, tag, val) \
333 (ABI_64_P (elf_hash_table (info)->dynobj) \
334 ? (boolean) (abort (), false) \
335 : bfd_elf32_add_dynamic_entry (info, (bfd_vma) tag, (bfd_vma) val))
336 #endif
338 /* The number of local .got entries we reserve. */
339 #define MIPS_RESERVED_GOTNO (2)
341 /* Instructions which appear in a stub. For some reason the stub is
342 slightly different on an SGI system. */
343 #define ELF_MIPS_GP_OFFSET(abfd) (SGI_COMPAT (abfd) ? 0x7ff0 : 0x8000)
344 #define STUB_LW(abfd) \
345 (SGI_COMPAT (abfd) \
346 ? (ABI_64_P (abfd) \
350 #define STUB_MOVE(abfd) \
353 #define STUB_LI16(abfd) \
355 #define MIPS_FUNCTION_STUB_SIZE (16)
357 #if 0
358 /* We no longer try to identify particular sections for the .dynsym
359 section. When we do, we wind up crashing if there are other random
360 sections with relocations. */
362 /* Names of sections which appear in the .dynsym section in an Irix 5
363 executable. */
366 {
375 NULL
376 };
378 #define SIZEOF_MIPS_DYNSYM_SECNAMES \
379 (sizeof mips_elf_dynsym_sec_names / sizeof mips_elf_dynsym_sec_names[0])
381 /* The number of entries in mips_elf_dynsym_sec_names which go in the
382 text segment. */
384 #define MIPS_TEXT_DYNSYM_SECNO (3)
388 /* The names of the runtime procedure table symbols used on Irix 5. */
391 {
395 NULL
396 };
398 /* These structures are used to generate the .compact_rel section on
399 Irix 5. */
402 {
412 {
422 {
432 {
441 {
448 {
453 /* These are the constants used to swap the bitfields in a crinfo. */
455 #define CRINFO_CTYPE (0x1)
456 #define CRINFO_CTYPE_SH (31)
457 #define CRINFO_RTYPE (0xf)
458 #define CRINFO_RTYPE_SH (27)
459 #define CRINFO_DIST2TO (0xff)
460 #define CRINFO_DIST2TO_SH (19)
461 #define CRINFO_RELVADDR (0x7ffff)
462 #define CRINFO_RELVADDR_SH (0)
464 /* A compact relocation info has long (3 words) or short (2 words)
465 formats. A short format doesn't have VADDR field and relvaddr
466 fields contains ((VADDR - vaddr of the previous entry) >> 2). */
467 #define CRF_MIPS_LONG 1
468 #define CRF_MIPS_SHORT 0
470 /* There are 4 types of compact relocation at least. The value KONST
471 has different meaning for each type:
473 (type) (konst)
474 CT_MIPS_REL32 Address in data
475 CT_MIPS_WORD Address in word (XXX)
476 CT_MIPS_GPHI_LO GP - vaddr
477 CT_MIPS_JMPAD Address to jump
478 */
480 #define CRT_MIPS_REL32 0xa
481 #define CRT_MIPS_WORD 0xb
482 #define CRT_MIPS_GPHI_LO 0xc
483 #define CRT_MIPS_JMPAD 0xd
485 #define mips_elf_set_cr_format(x,format) ((x).ctype = (format))
486 #define mips_elf_set_cr_type(x,type) ((x).rtype = (type))
487 #define mips_elf_set_cr_dist2to(x,v) ((x).dist2to = (v))
488 #define mips_elf_set_cr_relvaddr(x,d) ((x).relvaddr = (d)<<2)
490 static void bfd_elf32_swap_compact_rel_out
492 static void bfd_elf32_swap_crinfo_out
495 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
496 from smaller values. Start with zero, widen, *then* decrement. */
497 #define MINUS_ONE (((bfd_vma)0) - 1)
499 /* The relocation table used for SHT_REL sections. */
502 {
503 /* No relocation. */
518 /* 16 bit relocation. */
533 /* 32 bit relocation. */
548 /* 32 bit symbol relative relocation. */
563 /* 26 bit jump address. */
571 /* This needs complex overflow
572 detection, because the upper four
573 bits must match the PC + 4. */
581 /* High 16 bits of symbol value. */
596 /* Low 16 bits of symbol value. */
611 /* GP relative reference. */
626 /* Reference to literal section. */
641 /* Reference to global offset table. */
656 /* 16 bit PC relative reference. */
671 /* 16 bit call through global offset table. */
686 /* 32 bit GP relative reference. */
701 /* The remaining relocs are defined on Irix 5, although they are
702 not defined by the ABI. */
707 /* A 5 bit shift field. */
722 /* A 6 bit shift field. */
723 /* FIXME: This is not handled correctly; a special function is
724 needed to put the most significant bit in the right place. */
739 /* A 64 bit relocation. */
754 /* Displacement in the global offset table. */
769 /* Displacement to page pointer in the global offset table. */
784 /* Offset from page pointer in the global offset table. */
799 /* High 16 bits of displacement in global offset table. */
814 /* Low 16 bits of displacement in global offset table. */
829 /* 64 bit subtraction. Used in the N32 ABI. */
844 /* Used to cause the linker to insert and delete instructions? */
849 /* Get the higher value of a 64 bit addend. */
864 /* Get the highest value of a 64 bit addend. */
879 /* High 16 bits of displacement in global offset table. */
894 /* Low 16 bits of displacement in global offset table. */
909 /* Section displacement. */
929 /* Protected jump conversion. This is an optimization hint. No
930 relocation is required for correctness. */
944 };
946 /* The relocation table used for SHT_RELA sections. */
949 {
950 /* No relocation. */
965 /* 16 bit relocation. */
980 /* 32 bit relocation. */
995 /* 32 bit symbol relative relocation. */
1010 /* 26 bit jump address. */
1018 /* This needs complex overflow
1019 detection, because the upper 36
1020 bits must match the PC + 4. */
1028 /* R_MIPS_HI16 and R_MIPS_LO16 are unsupported for 64 bit REL. */
1029 /* High 16 bits of symbol value. */
1044 /* Low 16 bits of symbol value. */
1059 /* GP relative reference. */
1074 /* Reference to literal section. */
1089 /* Reference to global offset table. */
1090 /* FIXME: This is not handled correctly. */
1105 /* 16 bit PC relative reference. */
1120 /* 16 bit call through global offset table. */
1121 /* FIXME: This is not handled correctly. */
1136 /* 32 bit GP relative reference. */
1155 /* A 5 bit shift field. */
1170 /* A 6 bit shift field. */
1171 /* FIXME: Not handled correctly. */
1186 /* 64 bit relocation. */
1201 /* Displacement in the global offset table. */
1202 /* FIXME: Not handled correctly. */
1217 /* Displacement to page pointer in the global offset table. */
1218 /* FIXME: Not handled correctly. */
1233 /* Offset from page pointer in the global offset table. */
1234 /* FIXME: Not handled correctly. */
1249 /* High 16 bits of displacement in global offset table. */
1250 /* FIXME: Not handled correctly. */
1265 /* Low 16 bits of displacement in global offset table. */
1266 /* FIXME: Not handled correctly. */
1281 /* 64 bit substraction. */
1282 /* FIXME: Not handled correctly. */
1297 /* Insert the addend as an instruction. */
1298 /* FIXME: Not handled correctly. */
1313 /* Insert the addend as an instruction, and change all relocations
1314 to refer to the old instruction at the address. */
1315 /* FIXME: Not handled correctly. */
1330 /* Delete a 32 bit instruction. */
1331 /* FIXME: Not handled correctly. */
1346 /* Get the higher value of a 64 bit addend. */
1361 /* Get the highest value of a 64 bit addend. */
1376 /* High 16 bits of displacement in global offset table. */
1377 /* FIXME: Not handled correctly. */
1392 /* Low 16 bits of displacement in global offset table. */
1393 /* FIXME: Not handled correctly. */
1408 /* Section displacement, used by an associated event location section. */
1409 /* FIXME: Not handled correctly. */
1438 /* These two are obsolete. */
1442 /* Similiar to R_MIPS_REL32, but used for relocations in a GOT section.
1443 It must be used for multigot GOT's (and only there). */
1458 /* Protected jump conversion. This is an optimization hint. No
1459 relocation is required for correctness. */
1473 };
1475 /* The reloc used for BFD_RELOC_CTOR when doing a 64 bit link. This
1476 is a hack to make the linker think that we need 64 bit values. */
1492 /* The reloc used for the mips16 jump instruction. */
1501 /* This needs complex overflow
1502 detection, because the upper four
1503 bits must match the PC. */
1511 /* The reloc used for the mips16 gprel instruction. */
1527 /* GNU extensions for embedded-pic. */
1528 /* High 16 bits of symbol value, pc-relative. */
1544 /* Low 16 bits of symbol value, pc-relative. */
1560 /* 16 bit offset for pc-relative branches. */
1576 /* 64 bit pc-relative. */
1592 /* 32 bit pc-relative. */
1608 /* GNU extension to record C++ vtable hierarchy */
1624 /* GNU extension to record C++ vtable member usage */
1640 /* Do a R_MIPS_HI16 relocation. This has to be done in combination
1641 with a R_MIPS_LO16 reloc, because there is a carry from the LO16 to
1642 the HI16. Here we just save the information we need; we do the
1643 actual relocation when we see the LO16. MIPS ELF requires that the
1644 LO16 immediately follow the HI16. As a GNU extension, we permit an
1645 arbitrary number of HI16 relocs to be associated with a single LO16
1646 reloc. This extension permits gcc to output the HI and LO relocs
1647 itself. */
1649 struct mips_hi16
1650 {
1653 bfd_vma addend;
1654 };
1656 /* FIXME: This should not be a static variable. */
1660 bfd_reloc_status_type
1662 reloc_entry,
1663 symbol,
1664 data,
1665 input_section,
1666 output_bfd,
1667 error_message)
1671 PTR data;
1675 {
1676 bfd_reloc_status_type ret;
1677 bfd_vma relocation;
1680 /* If we're relocating, and this an external symbol, we don't want
1681 to change anything. */
1685 {
1688 }
1693 {
1694 boolean relocateable;
1695 bfd_vma gp;
1702 else
1703 {
1706 }
1714 }
1715 else
1716 {
1723 else
1725 }
1736 /* Save the information, and let LO16 do the actual relocation. */
1749 }
1751 /* Do a R_MIPS_LO16 relocation. This is a straightforward 16 bit
1752 inplace relocation; this function exists in order to do the
1753 R_MIPS_HI16 relocation described above. */
1755 bfd_reloc_status_type
1757 reloc_entry,
1758 symbol,
1759 data,
1760 input_section,
1761 output_bfd,
1762 error_message)
1766 PTR data;
1770 {
1771 arelent gp_disp_relent;
1774 {
1779 {
1785 /* Do the HI16 relocation. Note that we actually don't need
1786 to know anything about the LO16 itself, except where to
1787 find the low 16 bits of the addend needed by the LO16. */
1791 /* The low order 16 bits are always treated as a signed
1792 value. */
1797 /* At this point, "val" has the value of the combined HI/LO
1798 pair. If the low order 16 bits (which will be used for
1799 the LO16 insn) are negative, then we will need an
1800 adjustment for the high order 16 bits. */
1809 {
1813 }
1818 }
1821 }
1823 {
1824 bfd_reloc_status_type ret;
1827 /* FIXME: Does this case ever occur? */
1844 }
1846 /* Now do the LO16 reloc in the usual way. */
1849 }
1851 /* Do a R_MIPS_GOT16 reloc. This is a reloc against the global offset
1852 table used for PIC code. If the symbol is an external symbol, the
1853 instruction is modified to contain the offset of the appropriate
1854 entry in the global offset table. If the symbol is a section
1855 symbol, the next reloc is a R_MIPS_LO16 reloc. The two 16 bit
1856 addends are combined to form the real addend against the section
1857 symbol; the GOT16 is modified to contain the offset of an entry in
1858 the global offset table, and the LO16 is modified to offset it
1859 appropriately. Thus an offset larger than 16 bits requires a
1860 modified value in the global offset table.
1862 This implementation suffices for the assembler, but the linker does
1863 not yet know how to create global offset tables. */
1865 bfd_reloc_status_type
1867 reloc_entry,
1868 symbol,
1869 data,
1870 input_section,
1871 output_bfd,
1872 error_message)
1876 PTR data;
1880 {
1881 /* If we're relocating, and this an external symbol, we don't want
1882 to change anything. */
1886 {
1889 }
1891 /* If we're relocating, and this is a local symbol, we can handle it
1892 just like HI16. */
1899 }
1901 /* Set the GP value for OUTPUT_BFD. Returns false if this is a
1902 dangerous relocation. */
1904 static boolean
1908 {
1913 /* If we've already figured out what GP will be, just return it. */
1921 /* The linker script will have created a symbol named `_gp' with the
1922 appropriate value. */
1925 else
1926 {
1928 {
1933 {
1937 }
1938 }
1939 }
1942 {
1943 /* Only get the error once. */
1947 }
1950 }
1952 /* We have to figure out the gp value, so that we can adjust the
1953 symbol value correctly. We look up the symbol _gp in the output
1954 BFD. If we can't find it, we're stuck. We cache it in the ELF
1955 target data. We don't need to adjust the symbol value for an
1956 external symbol if we are producing relocateable output. */
1958 static bfd_reloc_status_type
1962 boolean relocateable;
1965 {
1968 {
1971 }
1975 && (! relocateable
1977 {
1979 {
1980 /* Make up a value. */
1983 }
1985 {
1989 }
1990 }
1993 }
1995 /* Do a R_MIPS_GPREL16 relocation. This is a 16 bit value which must
1996 become the offset from the gp register. This function also handles
1997 R_MIPS_LITERAL relocations, although those can be handled more
1998 cleverly because the entries in the .lit8 and .lit4 sections can be
1999 merged. */
2005 bfd_reloc_status_type
2011 PTR data;
2015 {
2016 boolean relocateable;
2017 bfd_reloc_status_type ret;
2018 bfd_vma gp;
2020 /* If we're relocating, and this is an external symbol with no
2021 addend, we don't want to change anything. We will only have an
2022 addend if this is a newly created reloc, not read from an ELF
2023 file. */
2027 {
2030 }
2034 else
2035 {
2038 }
2047 }
2049 static bfd_reloc_status_type
2051 gp)
2056 boolean relocateable;
2057 PTR data;
2058 bfd_vma gp;
2059 {
2060 bfd_vma relocation;
2066 else
2077 /* Set val to the offset into the section or symbol. */
2079 {
2080 /* This case occurs with the 64-bit MIPS ELF ABI. */
2082 }
2083 else
2084 {
2088 }
2090 /* Adjust val for the final section location and GP value. If we
2091 are producing relocateable output, we don't want to do this for
2092 an external symbol. */
2103 /* Make sure it fit in 16 bits. */
2108 }
2110 /* Do a R_MIPS_GPREL32 relocation. Is this 32 bit value the offset
2111 from the gp register? XXX */
2117 bfd_reloc_status_type
2119 reloc_entry,
2120 symbol,
2121 data,
2122 input_section,
2123 output_bfd,
2124 error_message)
2128 PTR data;
2132 {
2133 boolean relocateable;
2134 bfd_reloc_status_type ret;
2135 bfd_vma gp;
2137 /* If we're relocating, and this is an external symbol with no
2138 addend, we don't want to change anything. We will only have an
2139 addend if this is a newly created reloc, not read from an ELF
2140 file. */
2144 {
2148 }
2151 {
2154 }
2155 else
2156 {
2164 }
2168 }
2170 static bfd_reloc_status_type
2172 gp)
2177 boolean relocateable;
2178 PTR data;
2179 bfd_vma gp;
2180 {
2181 bfd_vma relocation;
2186 else
2196 {
2197 /* This case arises with the 64-bit MIPS ELF ABI. */
2199 }
2200 else
2203 /* Set val to the offset into the section or symbol. */
2206 /* Adjust val for the final section location and GP value. If we
2207 are producing relocateable output, we don't want to do this for
2208 an external symbol. */
2219 }
2221 /* Handle a 64 bit reloc in a 32 bit MIPS ELF file. These are
2222 generated when addresses are 64 bits. The upper 32 bits are a simple
2223 sign extension. */
2225 static bfd_reloc_status_type
2231 PTR data;
2235 {
2236 bfd_reloc_status_type r;
2237 arelent reloc32;
2239 bfd_size_type addr;
2246 /* Do a normal 32 bit relocation on the lower 32 bits. */
2254 /* Sign extend into the upper 32 bits. */
2258 else
2266 }
2268 /* Handle a mips16 jump. */
2270 static bfd_reloc_status_type
2276 PTR data ATTRIBUTE_UNUSED;
2280 {
2284 {
2287 }
2289 /* FIXME. */
2290 {
2298 }
2301 }
2303 /* Handle a mips16 GP relative reloc. */
2305 static bfd_reloc_status_type
2311 PTR data;
2315 {
2316 boolean relocateable;
2317 bfd_reloc_status_type ret;
2318 bfd_vma gp;
2322 /* If we're relocating, and this is an external symbol with no
2323 addend, we don't want to change anything. We will only have an
2324 addend if this is a newly created reloc, not read from an ELF
2325 file. */
2329 {
2332 }
2336 else
2337 {
2340 }
2350 /* Pick up the mips16 extend instruction and the real instruction. */
2354 /* Stuff the current addend back as a 32 bit value, do the usual
2355 relocation, and then clean up. */
2377 }
2379 /* Return the ISA for a MIPS e_flags value. */
2383 flagword flags;
2384 {
2386 {
2401 }
2403 }
2405 /* Return the MACH for a MIPS e_flags value. */
2409 flagword flags;
2410 {
2412 {
2433 {
2462 }
2463 }
2466 }
2468 /* Return printable name for ABI. */
2473 {
2474 flagword flags;
2478 {
2484 else
2496 }
2497 }
2499 /* A mapping from BFD reloc types to MIPS ELF reloc types. */
2502 bfd_reloc_code_real_type bfd_reloc_val;
2504 };
2507 {
2529 };
2531 /* Given a BFD reloc type, return a howto structure. */
2536 bfd_reloc_code_real_type code;
2537 {
2541 {
2544 }
2547 {
2553 /* We need to handle BFD_RELOC_CTOR specially.
2554 Select the right relocation (R_MIPS_32 or R_MIPS_64) based on the
2555 size of addresses on this architecture. */
2558 else
2579 }
2580 }
2582 /* Given a MIPS Elf32_Internal_Rel, fill in an arelent structure. */
2587 {
2589 {
2622 }
2623 }
2625 /* Given a MIPS Elf32_Internal_Rel, fill in an arelent structure. */
2627 static void
2632 {
2638 /* The addend for a GPREL16 or LITERAL relocation comes from the GP
2639 value for the object file. We get the addend now, rather than
2640 when we do the relocation, because the symbol manipulations done
2641 by the linker may cause us to lose track of the input BFD. */
2646 }
2648 /* Given a MIPS Elf32_Internal_Rela, fill in an arelent structure. */
2650 static void
2655 {
2656 /* Since an Elf32_Internal_Rel is an initial prefix of an
2657 Elf32_Internal_Rela, we can just use mips_info_to_howto_rel
2658 above. */
2661 /* If we ever need to do any extra processing with dst->r_addend
2662 (the field omitted in an Elf32_Internal_Rel) we can do it here. */
2663 }
2664 \f
2665 /* A .reginfo section holds a single Elf32_RegInfo structure. These
2666 routines swap this structure in and out. They are used outside of
2667 BFD, so they are globally visible. */
2669 void
2674 {
2681 }
2683 void
2688 {
2695 }
2697 /* In the 64 bit ABI, the .MIPS.options section holds register
2698 information in an Elf64_Reginfo structure. These routines swap
2699 them in and out. They are globally visible because they are used
2700 outside of BFD. These routines are here so that gas can call them
2701 without worrying about whether the 64 bit ABI has been included. */
2703 void
2708 {
2716 }
2718 void
2723 {
2731 }
2733 /* Swap an entry in a .gptab section. Note that these routines rely
2734 on the equivalence of the two elements of the union. */
2736 static void
2741 {
2744 }
2746 static void
2751 {
2754 }
2756 static void
2761 {
2768 }
2770 static void
2775 {
2785 }
2787 /* Swap in an options header. */
2789 void
2794 {
2799 }
2801 /* Swap out an options header. */
2803 void
2808 {
2813 }
2814 #if 0
2815 /* Swap in an MSYM entry. */
2817 static void
2822 {
2825 }
2826 #endif
2827 /* Swap out an MSYM entry. */
2829 static void
2834 {
2837 }
2838 \f
2839 /* Determine whether a symbol is global for the purposes of splitting
2840 the symbol table into global symbols and local symbols. At least
2841 on Irix 5, this split must be between section symbols and all other
2842 symbols. On most ELF targets the split is between static symbols
2843 and externally visible symbols. */
2845 static boolean
2849 {
2852 else
2856 }
2857 \f
2858 /* Set the right machine number for a MIPS ELF file. This is used for
2859 both the 32-bit and the 64-bit ABI. */
2861 boolean
2864 {
2865 /* Irix 5 and 6 are broken. Object file symbol tables are not always
2866 sorted correctly such that local symbols precede global symbols,
2867 and the sh_info field in the symbol table is not always right. */
2874 }
2876 /* The final processing done just before writing out a MIPS ELF object
2877 file. This gets the MIPS architecture right based on the machine
2878 number. This is used by both the 32-bit and the 64-bit ABI. */
2880 void
2883 boolean linker ATTRIBUTE_UNUSED;
2884 {
2892 {
2950 }
2955 /* Set the sh_info field for .gptab sections and other appropriate
2956 info for each special section. */
2960 {
2962 {
3008 else
3009 {
3013 (name
3015 }
3020 }
3021 }
3022 }
3023 \f
3024 /* Function to keep MIPS specific file flags like as EF_MIPS_PIC. */
3026 boolean
3029 flagword flags;
3030 {
3037 }
3039 /* Merge backend specific data from an object file to the output
3040 object file when linking. */
3042 boolean
3046 {
3047 flagword old_flags;
3048 flagword new_flags;
3049 boolean ok;
3053 /* Check if we have the same endianess */
3066 {
3074 {
3078 }
3081 }
3083 /* Check flag compatibility. */
3091 /* Check to see if the input BFD actually contains any sections.
3092 If not, its flags may not have been initialised either, but it cannot
3093 actually cause any incompatibility. */
3095 {
3096 /* Ignore synthetic sections and empty .text, .data and .bss sections
3097 which are automatically generated by gas. */
3104 {
3107 }
3108 }
3115 {
3122 }
3125 {
3132 }
3134 /* Compare the ISA's. */
3137 {
3143 /* If either has no machine specified, just compare the general isa's.
3144 Some combinations of machines are ok, if the isa's match. */
3146 || ! old_mach
3148 )
3149 {
3150 /* Don't warn about mixing code using 32-bit ISAs, or mixing code
3151 using 64-bit ISAs. They will normally use the same data sizes
3152 and calling conventions. */
3156 {
3161 }
3162 }
3164 else
3165 {
3172 }
3176 }
3178 /* Compare ABI's. The 64-bit ABI does not use EF_MIPS_ABI. But, it
3179 does set EI_CLASS differently from any 32-bit ABI. */
3183 {
3184 /* Only error if both are set (to different values). */
3188 {
3195 }
3198 }
3200 /* Warn about any other mismatches */
3202 {
3208 }
3211 {
3214 }
3217 }
3218 \f
3219 boolean
3222 PTR ptr;
3223 {
3228 /* Print normal ELF private data. */
3231 /* xgettext:c-format */
3248 else
3265 else
3270 else
3276 }
3277 \f
3278 /* Handle a MIPS specific section when reading an object file. This
3279 is called when elfcode.h finds a section with an unknown type.
3280 This routine supports both the 32-bit and 64-bit ELF ABI.
3282 FIXME: We need to handle the SHF_MIPS_GPREL flag, but I'm not sure
3283 how to. */
3285 boolean
3290 {
3293 /* There ought to be a place to keep ELF backend specific flags, but
3294 at the moment there isn't one. We just keep track of the
3295 sections by their name, instead. Fortunately, the ABI gives
3296 suggested names for all the MIPS specific sections, so we will
3297 probably get away with this. */
3299 {
3359 }
3365 {
3371 }
3373 /* FIXME: We should record sh_info for a .gptab section. */
3375 /* For a .reginfo section, set the gp value in the tdata information
3376 from the contents of this section. We need the gp value while
3377 processing relocs, so we just get it now. The .reginfo section
3378 is not used in the 64-bit MIPS ELF ABI. */
3380 {
3381 Elf32_External_RegInfo ext;
3382 Elf32_RegInfo s;
3390 }
3392 /* For a SHT_MIPS_OPTIONS section, look for a ODK_REGINFO entry, and
3393 set the gp value based on what we find. We may see both
3394 SHT_MIPS_REGINFO and SHT_MIPS_OPTIONS/ODK_REGINFO; in that case,
3395 they should agree. */
3397 {
3405 {
3408 }
3412 {
3413 Elf_Internal_Options intopt;
3418 {
3419 Elf64_Internal_RegInfo intreg;
3421 bfd_mips_elf64_swap_reginfo_in
3427 }
3429 {
3430 Elf32_RegInfo intreg;
3432 bfd_mips_elf32_swap_reginfo_in
3438 }
3440 }
3442 }
3445 }
3447 /* Set the correct type for a MIPS ELF section. We do this by the
3448 section name, which is a hack, but ought to work. This routine is
3449 used by both the 32-bit and the 64-bit ABI. */
3451 boolean
3456 {
3462 {
3465 /* The sh_link field is set in final_write_processing. */
3466 }
3470 {
3473 /* The sh_info field is set in final_write_processing. */
3474 }
3478 {
3480 /* In a shared object on Irix 5.3, the .mdebug section has an
3481 entsize of 0. FIXME: Does this matter? */
3484 else
3486 }
3488 {
3490 /* In a shared object on Irix 5.3, the .reginfo section has an
3491 entsize of 0x18. FIXME: Does this matter? */
3493 {
3496 else
3498 }
3499 else
3501 }
3506 {
3509 #if 0
3510 /* This isn't how the Irix 6 linker behaves. */
3512 #endif
3513 }
3522 {
3525 }
3527 {
3530 /* The sh_info field is set in final_write_processing. */
3531 }
3533 {
3537 }
3541 {
3543 /* The sh_link and sh_info fields are set in
3544 final_write_processing. */
3545 }
3549 {
3552 /* The sh_link field is set in final_write_processing. */
3553 }
3555 {
3559 }
3561 /* The generic elf_fake_sections will set up REL_HDR using the
3562 default kind of relocations. But, we may actually need both
3563 kinds of relocations, so we set up the second header here. */
3565 {
3576 }
3579 }
3581 /* Given a BFD section, try to locate the corresponding ELF section
3582 index. This is used by both the 32-bit and the 64-bit ABI.
3583 Actually, it's not clear to me that the 64-bit ABI supports these,
3584 but for non-PIC objects we will certainly want support for at least
3585 the .scommon section. */
3587 boolean
3592 {
3594 {
3597 }
3599 {
3602 }
3604 }
3606 /* When are writing out the .options or .MIPS.options section,
3607 remember the bytes we are writing out, so that we can install the
3608 GP value in the section_processing routine. */
3610 boolean
3613 sec_ptr section;
3614 PTR location;
3615 file_ptr offset;
3616 bfd_size_type count;
3617 {
3619 {
3623 {
3628 }
3631 {
3632 bfd_size_type size;
3636 else
3642 }
3645 }
3648 count);
3649 }
3651 /* Work over a section just before writing it out. This routine is
3652 used by both the 32-bit and the 64-bit ABI. FIXME: We recognize
3653 sections that need the SHF_MIPS_GPREL flag by name; there has to be
3654 a better way. */
3656 boolean
3660 {
3663 {
3676 }
3682 {
3685 /* We stored the section contents in the elf_section_data tdata
3686 field in the set_section_contents routine. We save the
3687 section contents so that we don't have to read them again.
3688 At this point we know that elf_gp is set, so we can look
3689 through the section contents to see if there is an
3690 ODK_REGINFO structure. */
3696 {
3697 Elf_Internal_Options intopt;
3702 {
3715 }
3717 {
3730 }
3732 }
3733 }
3736 {
3742 {
3745 }
3747 {
3750 }
3752 {
3755 }
3757 {
3760 }
3762 {
3764 {
3770 }
3771 }
3772 }
3775 }
3776 \f
3777 /* MIPS ELF uses two common sections. One is the usual one, and the
3778 other is for small objects. All the small objects are kept
3779 together, and then referenced via the gp pointer, which yields
3780 faster assembler code. This is what we use for the small common
3781 section. This approach is copied from ecoff.c. */
3786 /* MIPS ELF also uses an acommon section, which represents an
3787 allocated common symbol which may be overridden by a
3788 definition in a shared library. */
3793 /* Handle the special MIPS section numbers that a symbol may use.
3794 This is used for both the 32-bit and the 64-bit ABI. */
3796 void
3800 {
3805 {
3807 /* This section is used in a dynamically linked executable file.
3808 It is an allocated common section. The dynamic linker can
3809 either resolve these symbols to something in a shared
3810 library, or it can just leave them here. For our purposes,
3811 we can consider these symbols to be in a new section. */
3813 {
3814 /* Initialize the acommon section. */
3824 }
3829 /* Common symbols less than the GP size are automatically
3830 treated as SHN_MIPS_SCOMMON symbols on IRIX5. */
3834 /* Fall through. */
3837 {
3838 /* Initialize the small common section. */
3848 }
3865 #endif
3866 }
3867 }
3868 \f
3869 /* When creating an Irix 5 executable, we need REGINFO and RTPROC
3870 segments. */
3872 int
3875 {
3879 /* See if we need a PT_MIPS_REGINFO segment. */
3884 /* See if we need a PT_MIPS_OPTIONS segment. */
3890 /* See if we need a PT_MIPS_RTPROC segment. */
3897 }
3899 /* Modify the segment map for an Irix 5 executable. */
3901 boolean
3904 {
3907 bfd_size_type amt;
3909 /* If there is a .reginfo section, we need a PT_MIPS_REGINFO
3910 segment. */
3913 {
3918 {
3928 /* We want to put it after the PHDR and INTERP segments. */
3937 }
3938 }
3940 /* For IRIX 6, we don't have .mdebug sections, nor does anything but
3941 .dynamic end up in PT_DYNAMIC. However, we do have to insert a
3942 PT_OPTIONS segement immediately following the program header
3943 table. */
3945 {
3951 {
3954 /* Usually, there's a program header table. But, sometimes
3955 there's not (like when running the `ld' testsuite). So,
3956 if there's no program header table, we just put the
3957 options segement at the end. */
3973 }
3974 }
3975 else
3976 {
3978 {
3979 /* If there are .dynamic and .mdebug sections, we make a room
3980 for the RTPROC header. FIXME: Rewrite without section names. */
3984 {
3989 {
3999 {
4003 }
4004 else
4005 {
4008 }
4010 /* We want to put it after the DYNAMIC segment. */
4019 }
4020 }
4021 }
4022 /* On Irix 5, the PT_DYNAMIC segment includes the .dynamic,
4023 .dynstr, .dynsym, and .hash sections, and everything in
4024 between. */
4031 {
4032 /* For a normal mips executable the permissions for the PT_DYNAMIC
4033 segment are read, write and execute. We do that here since
4034 the code in elf.c sets only the read permission. This matters
4035 sometimes for the dynamic linker. */
4037 {
4040 }
4041 }
4044 {
4046 {
4048 };
4056 {
4059 {
4060 bfd_size_type sz;
4069 }
4070 }
4090 {
4096 {
4099 }
4100 }
4103 }
4104 }
4107 }
4108 \f
4109 /* The structure of the runtime procedure descriptor created by the
4110 loader for use by the static exception system. */
4125 #define cbRPDR sizeof (RPDR)
4126 #define rpdNil ((pRPDR) 0)
4128 /* Swap RPDR (runtime procedure table entry) for output. */
4130 static void ecoff_swap_rpdr_out
4133 static void
4138 {
4139 /* ECOFF_PUT_OFF was defined in ecoffswap.h. */
4153 #endif
4154 }
4155 \f
4156 /* Read ECOFF debugging information from a .mdebug section into a
4157 ecoff_debug_info structure. */
4159 boolean
4164 {
4184 /* The symbolic header contains absolute file offsets and sizes to
4185 read. */
4186 #define READ(ptr, offset, count, size, type) \
4187 if (symhdr->count == 0) \
4188 debug->ptr = NULL; \
4189 else \
4190 { \
4191 bfd_size_type amt = (bfd_size_type) size * symhdr->count; \
4192 debug->ptr = (type) bfd_malloc (amt); \
4193 if (debug->ptr == NULL) \
4194 goto error_return; \
4195 if (bfd_seek (abfd, (file_ptr) symhdr->offset, SEEK_SET) != 0 \
4196 || bfd_bread (debug->ptr, amt, abfd) != amt) \
4197 goto error_return; \
4198 }
4212 #undef READ
4219 error_return:
4245 }
4246 \f
4247 /* MIPS ELF local labels start with '$', not 'L'. */
4249 static boolean
4253 {
4257 /* On Irix 6, the labels go back to starting with '.', so we accept
4258 the generic ELF local label syntax as well. */
4260 }
4262 /* MIPS ELF uses a special find_nearest_line routine in order the
4263 handle the ECOFF debugging information. */
4265 struct mips_elf_find_line
4266 {
4269 };
4271 boolean
4277 bfd_vma offset;
4281 {
4286 line_ptr))
4291 line_ptr,
4298 {
4299 flagword origflags;
4304 /* If we are called during a link, mips_elf_final_link may have
4305 cleared the SEC_HAS_CONTENTS field. We force it back on here
4306 if appropriate (which it normally will be). */
4313 {
4314 bfd_size_type external_fdr_size;
4322 {
4325 }
4328 {
4331 }
4333 /* Swap in the FDR information. */
4337 {
4340 }
4344 fraw_end = (fraw_src
4351 /* Note that we don't bother to ever free this information.
4352 find_nearest_line is either called all the time, as in
4353 objdump -l, so the information should be saved, or it is
4354 rarely called, as in ld error messages, so the memory
4355 wasted is unimportant. Still, it would probably be a
4356 good idea for free_cached_info to throw it away. */
4357 }
4361 line_ptr))
4362 {
4365 }
4368 }
4370 /* Fall back on the generic ELF find_nearest_line routine. */
4374 line_ptr);
4375 }
4376 \f
4377 /* The mips16 compiler uses a couple of special sections to handle
4378 floating point arguments.
4380 Section names that look like .mips16.fn.FNNAME contain stubs that
4381 copy floating point arguments from the fp regs to the gp regs and
4382 then jump to FNNAME. If any 32 bit function calls FNNAME, the
4383 call should be redirected to the stub instead. If no 32 bit
4384 function calls FNNAME, the stub should be discarded. We need to
4385 consider any reference to the function, not just a call, because
4386 if the address of the function is taken we will need the stub,
4387 since the address might be passed to a 32 bit function.
4389 Section names that look like .mips16.call.FNNAME contain stubs
4390 that copy floating point arguments from the gp regs to the fp
4391 regs and then jump to FNNAME. If FNNAME is a 32 bit function,
4392 then any 16 bit function that calls FNNAME should be redirected
4393 to the stub instead. If FNNAME is not a 32 bit function, the
4394 stub should be discarded.
4396 .mips16.call.fp.FNNAME sections are similar, but contain stubs
4397 which call FNNAME and then copy the return value from the fp regs
4398 to the gp regs. These stubs store the return value in $18 while
4399 calling FNNAME; any function which might call one of these stubs
4400 must arrange to save $18 around the call. (This case is not
4401 needed for 32 bit functions that call 16 bit functions, because
4402 16 bit functions always return floating point values in both
4403 $f0/$f1 and $2/$3.)
4405 Note that in all cases FNNAME might be defined statically.
4406 Therefore, FNNAME is not used literally. Instead, the relocation
4407 information will indicate which symbol the section is for.
4409 We record any stubs that we find in the symbol table. */
4415 /* MIPS ELF linker hash table. */
4417 struct mips_elf_link_hash_table
4418 {
4420 #if 0
4421 /* We no longer use this. */
4422 /* String section indices for the dynamic section symbols. */
4424 #endif
4425 /* The number of .rtproc entries. */
4426 bfd_size_type procedure_count;
4427 /* The size of the .compact_rel section (if SGI_COMPAT). */
4428 bfd_size_type compact_rel_size;
4429 /* This flag indicates that the value of DT_MIPS_RLD_MAP dynamic
4430 entry is set to the address of __rld_obj_head as in Irix 5. */
4431 boolean use_rld_obj_head;
4432 /* This is the value of the __rld_map or __rld_obj_head symbol. */
4433 bfd_vma rld_value;
4434 /* This is set if we see any mips16 stub sections. */
4435 boolean mips16_stubs_seen;
4436 };
4438 /* Look up an entry in a MIPS ELF linker hash table. */
4440 #define mips_elf_link_hash_lookup(table, string, create, copy, follow) \
4441 ((struct mips_elf_link_hash_entry *) \
4442 elf_link_hash_lookup (&(table)->root, (string), (create), \
4443 (copy), (follow)))
4445 /* Traverse a MIPS ELF linker hash table. */
4447 #define mips_elf_link_hash_traverse(table, func, info) \
4448 (elf_link_hash_traverse \
4449 (&(table)->root, \
4450 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
4451 (info)))
4453 /* Get the MIPS ELF linker hash table from a link_info structure. */
4455 #define mips_elf_hash_table(p) \
4456 ((struct mips_elf_link_hash_table *) ((p)->hash))
4458 static boolean mips_elf_output_extsym
4461 /* Create an entry in a MIPS ELF linker hash table. */
4468 {
4472 /* Allocate the structure if it has not already been allocated by a
4473 subclass. */
4481 /* Call the allocation method of the superclass. */
4486 {
4487 /* Set local fields. */
4489 /* We use -2 as a marker to indicate that the information has
4490 not been set. -1 means there is no associated ifd. */
4500 }
4503 }
4505 static void
4509 {
4524 /* FIXME: Do we allocate too much GOT space here? */
4527 }
4529 /* Create a MIPS ELF linker hash table. */
4534 {
4543 mips_elf_link_hash_newfunc))
4544 {
4547 }
4549 #if 0
4550 /* We no longer use this. */
4553 #endif
4561 }
4563 /* Hook called by the linker routine which adds symbols from an object
4564 file. We must handle the special MIPS section numbers here. */
4566 boolean
4575 {
4579 {
4580 /* Skip Irix 5 rld entry name. */
4583 }
4586 {
4588 /* Common symbols less than the GP size are automatically
4589 treated as SHN_MIPS_SCOMMON symbols. */
4593 /* Fall through. */
4601 /* This section is used in a shared object. */
4603 {
4617 /* Initialize the section. */
4632 }
4633 /* This code used to do *secp = bfd_und_section_ptr if
4634 info->shared. I don't know why, and that doesn't make sense,
4635 so I took it out. */
4640 /* Fall through. XXX Can we treat this as allocated data? */
4642 /* This section is used in a shared object. */
4644 {
4658 /* Initialize the section. */
4673 }
4674 /* This code used to do *secp = bfd_und_section_ptr if
4675 info->shared. I don't know why, and that doesn't make sense,
4676 so I took it out. */
4683 }
4689 {
4692 /* Mark __rld_obj_head as dynamic. */
4708 }
4710 /* If this is a mips16 text symbol, add 1 to the value to make it
4711 odd. This will cause something like .word SYM to come up with
4712 the right value when it is loaded into the PC. */
4717 }
4719 /* Structure used to pass information to mips_elf_output_extsym. */
4721 struct extsym_info
4722 {
4727 boolean failed;
4728 };
4730 /* This routine is used to write out ECOFF debugging external symbol
4731 information. It is called via mips_elf_link_hash_traverse. The
4732 ECOFF external symbol information must match the ELF external
4733 symbol information. Unfortunately, at this point we don't know
4734 whether a symbol is required by reloc information, so the two
4735 tables may wind up being different. We must sort out the external
4736 symbol information before we can set the final size of the .mdebug
4737 section, and we must set the size of the .mdebug section before we
4738 can relocate any sections, and we can't know which symbols are
4739 required by relocation until we relocate the sections.
4740 Fortunately, it is relatively unlikely that any symbol will be
4741 stripped but required by a reloc. In particular, it can not happen
4742 when generating a final executable. */
4744 static boolean
4747 PTR data;
4748 {
4750 boolean strip;
4766 else
4773 {
4784 {
4787 /* Use undefined class. Also, set class and type for some
4788 special symbols. */
4792 {
4796 }
4798 {
4803 }
4805 {
4809 }
4810 else
4812 }
4816 else
4817 {
4823 /* When making a shared library and symbol h is the one from
4824 the another shared library, OUTPUT_SECTION may be null. */
4827 else
4828 {
4848 else
4850 }
4851 }
4855 }
4861 {
4873 else
4875 }
4877 {
4882 {
4885 }
4888 {
4889 /* Set type and value for a symbol with a function stub. */
4894 else
4895 {
4901 else
4903 }
4906 #endif
4907 }
4908 }
4913 {
4916 }
4919 }
4921 /* Create a runtime procedure table from the .mdebug section. */
4923 static boolean
4925 PTR handle;
4930 {
4935 PTR rtproc;
4940 bfd_size_type size;
4941 bfd_size_type count;
4944 PDR pdr;
4945 SYMR sym;
4959 {
4997 {
5011 }
5012 }
5018 {
5021 }
5027 erp++;
5032 {
5036 }
5039 /* Set the size and contents of .rtproc section. */
5043 /* Skip this section later on (I don't think this currently
5044 matters, but someday it might). */
5060 error_return:
5072 }
5074 /* A comparison routine used to sort .gptab entries. */
5076 static int
5080 {
5085 }
5087 /* We need to use a special link routine to handle the .reginfo and
5088 the .mdebug sections. We need to merge all instances of these
5089 sections together, not write them all out sequentially. */
5091 boolean
5095 {
5101 Elf32_RegInfo reginfo;
5108 EXTR esym;
5110 bfd_size_type amt;
5113 {
5116 };
5118 {
5121 };
5123 /* If all the things we linked together were PIC, but we're
5124 producing an executable (rather than a shared object), then the
5125 resulting file is CPIC (i.e., it calls PIC code.) */
5129 {
5132 }
5134 /* We'd carefully arranged the dynamic symbol indices, and then the
5135 generic size_dynamic_sections renumbered them out from under us.
5136 Rather than trying somehow to prevent the renumbering, just do
5137 the sort again. */
5139 {
5144 /* When we resort, we must tell mips_elf_sort_hash_table what
5145 the lowest index it may use is. That's the number of section
5146 symbols we're going to add. The generic ELF linker only
5147 adds these symbols when building a shared object. Note that
5148 we count the sections after (possibly) removing the .options
5149 section above. */
5155 /* Make sure we didn't grow the global .got region. */
5164 }
5166 /* On IRIX5, we omit the .options section. On IRIX6, however, we
5167 include it, even though we don't process it quite right. (Some
5168 entries are supposed to be merged.) Empirically, we seem to be
5169 better off including it then not. */
5172 {
5174 {
5183 }
5184 }
5186 /* Get a value for the GP register. */
5188 {
5198 {
5199 bfd_vma lo;
5201 /* Find the GP-relative section with the lowest offset. */
5208 /* And calculate GP relative to that. */
5210 }
5211 else
5212 {
5213 /* If the relocate_section function needs to do a reloc
5214 involving the GP value, it should make a reloc_dangerous
5215 callback to warn that GP is not defined. */
5216 }
5217 }
5219 /* Go through the sections and collect the .reginfo and .mdebug
5220 information. */
5226 {
5228 {
5231 /* We have found the .reginfo section in the output file.
5232 Look through all the link_orders comprising it and merge
5233 the information together. */
5237 {
5240 Elf32_External_RegInfo ext;
5241 Elf32_RegInfo sub;
5244 {
5248 }
5253 /* The linker emulation code has probably clobbered the
5254 size to be zero bytes. */
5272 /* ri_gp_value is set by the function
5273 mips_elf32_section_processing when the section is
5274 finally written out. */
5276 /* Hack: reset the SEC_HAS_CONTENTS flag so that
5277 elf_link_input_bfd ignores this section. */
5279 }
5281 /* Size has been set in mips_elf_always_size_sections */
5284 /* Skip this section later on (I don't think this currently
5285 matters, but someday it might). */
5289 }
5292 {
5294 bfd_vma last;
5296 /* We have found the .mdebug section in the output file.
5297 Look through all the link_orders comprising it and merge
5298 the information together. */
5300 /* FIXME: What should the version stamp be? */
5315 /* We accumulate the debugging information itself in the
5316 debug_info structure. */
5344 {
5348 {
5351 }
5352 else
5357 }
5362 {
5371 {
5375 }
5383 {
5384 /* I don't know what a non MIPS ELF bfd would be
5385 doing with a .mdebug section, but I don't really
5386 want to deal with it. */
5388 }
5395 /* The ECOFF linking code expects that we have already
5396 read in the debugging information and set up an
5397 ecoff_debug_info structure, so we do that now. */
5407 /* Loop through the external symbols. For each one with
5408 interesting information, try to find the symbol in
5409 the linker global hash table and save the information
5410 for the output external symbols. */
5412 eraw_end = (eraw_src
5418 {
5419 EXTR ext;
5436 {
5440 }
5443 }
5445 /* Free up the information we just read. */
5458 /* Hack: reset the SEC_HAS_CONTENTS flag so that
5459 elf_link_input_bfd ignores this section. */
5461 }
5464 {
5465 /* Create .rtproc section. */
5468 {
5477 }
5482 }
5484 /* Build the external symbol information. */
5491 mips_elf_output_extsym,
5496 /* Set the size of the .mdebug section. */
5499 /* Skip this section later on (I don't think this currently
5500 matters, but someday it might). */
5504 }
5507 {
5514 /* The .gptab.sdata and .gptab.sbss sections hold
5515 information describing how the small data area would
5516 change depending upon the -G switch. These sections
5517 not used in executables files. */
5519 {
5523 {
5527 {
5531 }
5535 /* Hack: reset the SEC_HAS_CONTENTS flag so that
5536 elf_link_input_bfd ignores this section. */
5538 }
5540 /* Skip this section later on (I don't think this
5541 currently matters, but someday it might). */
5544 /* Really remove the section. */
5548 ;
5553 }
5555 /* There is one gptab for initialized data, and one for
5556 uninitialized data. */
5561 else
5562 {
5568 }
5570 /* The linker script always combines .gptab.data and
5571 .gptab.sdata into .gptab.sdata, and likewise for
5572 .gptab.bss and .gptab.sbss. It is possible that there is
5573 no .sdata or .sbss section in the output file, in which
5574 case we must change the name of the output section. */
5577 {
5580 else
5584 }
5586 /* Set up the first entry. */
5595 /* Combine the input sections. */
5599 {
5602 bfd_size_type size;
5604 bfd_size_type gpentry;
5607 {
5611 }
5616 /* Combine the gptab entries for this input section one
5617 by one. We know that the input gptab entries are
5618 sorted by ascending -G value. */
5624 {
5625 Elf32_External_gptab ext_gptab;
5626 Elf32_gptab int_gptab;
5629 boolean exact;
5636 {
5639 }
5648 {
5654 }
5657 {
5661 /* We need a new table entry. */
5665 {
5668 }
5673 /* Merge in the size for the next smallest -G
5674 value, since that will be implied by this new
5675 value. */
5678 {
5684 }
5690 }
5693 }
5695 /* Hack: reset the SEC_HAS_CONTENTS flag so that
5696 elf_link_input_bfd ignores this section. */
5698 }
5700 /* The table must be sorted by -G value. */
5704 /* Swap out the table. */
5708 {
5711 }
5720 /* Skip this section later on (I don't think this currently
5721 matters, but someday it might). */
5723 }
5724 }
5726 /* Invoke the regular ELF backend linker to do all the work. */
5728 {
5729 #ifdef BFD64
5732 #else
5736 }
5740 /* Now write out the computed sections. */
5743 {
5744 Elf32_External_RegInfo ext;
5750 }
5753 {
5761 }
5764 {
5770 }
5773 {
5779 }
5782 {
5785 {
5791 }
5792 }
5795 }
5797 /* This function is called via qsort() to sort the dynamic relocation
5798 entries by increasing r_symndx value. */
5800 static int
5804 {
5808 Elf_Internal_Rel int_reloc1;
5809 Elf_Internal_Rel int_reloc2;
5815 }
5817 /* Returns the GOT section for ABFD. */
5822 {
5824 }
5826 /* Returns the GOT information associated with the link indicated by
5827 INFO. If SGOTP is non-NULL, it is filled in with the GOT
5828 section. */
5834 {
5847 }
5849 /* Return whether a relocation is against a local symbol. */
5851 static boolean
5853 check_forced)
5857 boolean check_forced;
5858 {
5874 {
5875 /* Look up the hash table to check whether the symbol
5876 was forced local. */
5879 /* Find the real hash-table entry for this symbol. */
5885 }
5888 }
5890 /* Sign-extend VALUE, which has the indicated number of BITS. */
5892 static bfd_vma
5894 bfd_vma value;
5896 {
5898 /* VALUE is negative. */
5902 }
5904 /* Return non-zero if the indicated VALUE has overflowed the maximum
5905 range expressable by a signed number with the indicated number of
5906 BITS. */
5908 static boolean
5910 bfd_vma value;
5912 {
5916 /* The value is too big. */
5919 /* The value is too small. */
5922 /* All is well. */
5924 }
5926 /* Calculate the %high function. */
5928 static bfd_vma
5930 bfd_vma value;
5931 {
5933 }
5935 /* Calculate the %higher function. */
5937 static bfd_vma
5939 bfd_vma value ATTRIBUTE_UNUSED;
5940 {
5941 #ifdef BFD64
5943 #else
5946 #endif
5947 }
5949 /* Calculate the %highest function. */
5951 static bfd_vma
5953 bfd_vma value ATTRIBUTE_UNUSED;
5954 {
5955 #ifdef BFD64
5957 #else
5960 #endif
5961 }
5963 /* Returns the GOT index for the global symbol indicated by H. */
5965 static bfd_vma
5969 {
5970 bfd_vma index;
5976 /* Once we determine the global GOT entry with the lowest dynamic
5977 symbol table index, we must put all dynamic symbols with greater
5978 indices into the GOT. That makes it easy to calculate the GOT
5979 offset. */
5986 }
5988 /* Returns the offset for the entry at the INDEXth position
5989 in the GOT. */
5991 static bfd_vma
5995 bfd_vma index;
5996 {
5998 bfd_vma gp;
6003 gp);
6004 }
6006 /* If H is a symbol that needs a global GOT entry, but has a dynamic
6007 symbol table index lower than any we've seen to date, record it for
6008 posterity. */
6010 static boolean
6015 {
6016 /* A global symbol in the GOT must also be in the dynamic symbol
6017 table. */
6022 /* If we've already marked this entry as needing GOT space, we don't
6023 need to do it again. */
6027 /* By setting this to a value other than -1, we are indicating that
6028 there needs to be a GOT entry for H. Avoid using zero, as the
6029 generic ELF copy_indirect_symbol tests for <= 0. */
6033 }
6035 /* This structure is passed to mips_elf_sort_hash_table_f when sorting
6036 the dynamic symbols. */
6038 struct mips_elf_hash_sort_data
6039 {
6040 /* The symbol in the global GOT with the lowest dynamic symbol table
6041 index. */
6043 /* The least dynamic symbol table index corresponding to a symbol
6044 with a GOT entry. */
6046 /* The greatest dynamic symbol table index not corresponding to a
6047 symbol without a GOT entry. */
6049 };
6051 /* If H needs a GOT entry, assign it the highest available dynamic
6052 index. Otherwise, assign it the lowest available dynamic
6053 index. */
6055 static boolean
6058 PTR data;
6059 {
6063 /* Symbols without dynamic symbol table entries aren't interesting
6064 at all. */
6070 else
6071 {
6074 }
6077 }
6079 /* Sort the dynamic symbol table so that symbols that need GOT entries
6080 appear towards the end. This reduces the amount of GOT space
6081 required. MAX_LOCAL is used to set the number of local symbols
6082 known to be in the dynamic symbol table. During
6083 mips_elf_size_dynamic_sections, this value is 1. Afterward, the
6084 section symbols are added and the count is higher. */
6086 static boolean
6090 {
6102 mips_elf_sort_hash_table_f,
6105 /* There should have been enough room in the symbol table to
6106 accomodate both the GOT and non-GOT symbols. */
6109 /* Now we know which dynamic symbol has the lowest dynamic symbol
6110 table index in the GOT. */
6115 }
6117 /* Create a local GOT entry for VALUE. Return the index of the entry,
6118 or -1 if it could not be created. */
6120 static bfd_vma
6125 bfd_vma value;
6126 {
6128 {
6129 /* We didn't allocate enough space in the GOT. */
6134 }
6140 }
6142 /* Returns the GOT offset at which the indicated address can be found.
6143 If there is not yet a GOT entry for this value, create one. Returns
6144 -1 if no satisfactory GOT offset can be found. */
6146 static bfd_vma
6150 bfd_vma value;
6151 {
6158 /* Look to see if we already have an appropriate entry. */
6163 {
6167 }
6170 }
6172 /* Find a GOT entry that is within 32KB of the VALUE. These entries
6173 are supposed to be placed at small offsets in the GOT, i.e.,
6174 within 32KB of GP. Return the index into the GOT for this page,
6175 and store the offset from this entry to the desired address in
6176 OFFSETP, if it is non-NULL. */
6178 static bfd_vma
6182 bfd_vma value;
6184 {
6190 bfd_vma address;
6194 /* Look to see if we aleady have an appropriate entry. */
6200 {
6204 {
6205 /* This entry will serve as the page pointer. We can add a
6206 16-bit number to it to get the actual address. */
6209 }
6210 }
6212 /* If we didn't have an appropriate entry, we create one now. */
6217 {
6220 }
6223 }
6225 /* Find a GOT entry whose higher-order 16 bits are the same as those
6226 for value. Return the index into the GOT for this entry. */
6228 static bfd_vma
6232 bfd_vma value;
6233 boolean external;
6234 {
6240 bfd_vma address;
6243 {
6244 /* Although the ABI says that it is "the high-order 16 bits" that we
6245 want, it is really the %high value. The complete value is
6246 calculated with a `addiu' of a LO16 relocation, just as with a
6247 HI16/LO16 pair. */
6249 }
6253 /* Look to see if we already have an appropriate entry. */
6259 {
6262 {
6263 /* This entry has the right high-order 16 bits, and the low-order
6264 16 bits are set to zero. */
6267 }
6268 }
6270 /* If we didn't have an appropriate entry, we create one now. */
6275 }
6277 /* Returns the first relocation of type r_type found, beginning with
6278 RELOCATION. RELEND is one-past-the-end of the relocation table. */
6285 {
6286 /* According to the MIPS ELF ABI, the R_MIPS_LO16 relocation must be
6287 immediately following. However, for the IRIX6 ABI, the next
6288 relocation may be a composed relocation consisting of several
6289 relocations for the same address. In that case, the R_MIPS_LO16
6290 relocation may occur as one of these. We permit a similar
6291 extension in general, as that is useful for GCC. */
6293 {
6298 }
6300 /* We didn't find it. */
6303 }
6305 /* Create a rel.dyn relocation for the dynamic linker to resolve. REL
6306 is the original relocation, which is now being transformed into a
6307 dynamic relocation. The ADDENDP is adjusted if necessary; the
6308 caller should store the result in place of the original addend. */
6310 static boolean
6318 bfd_vma symbol;
6321 {
6322 Elf_Internal_Rel outrel;
6323 boolean skip;
6330 sreloc
6344 /* If we've decided to skip this relocation, just output an empty
6345 record. Note that R_MIPS_NONE == 0, so that this call to memset
6346 is a way of setting R_TYPE to R_MIPS_NONE. */
6349 else
6350 {
6352 bfd_vma section_offset;
6354 /* We must now calculate the dynamic symbol table index to use
6355 in the relocation. */
6359 {
6361 /* h->root.dynindx may be -1 if this symbol was marked to
6362 become local. */
6365 }
6366 else
6367 {
6371 {
6374 }
6375 else
6376 {
6380 }
6382 /* Figure out how far the target of the relocation is from
6383 the beginning of its section. */
6385 /* The relocation we're building is section-relative.
6386 Therefore, the original addend must be adjusted by the
6387 section offset. */
6389 /* Now, the relocation is just against the section. */
6391 }
6393 /* If the relocation was previously an absolute relocation and
6394 this symbol will not be referred to by the relocation, we must
6395 adjust it by the value we give it in the dynamic symbol table.
6396 Otherwise leave the job up to the dynamic linker. */
6400 /* The relocation is always an REL32 relocation because we don't
6401 know where the shared library will wind up at load-time. */
6404 /* Adjust the output offset of the relocation to reference the
6405 correct location in the output file. */
6408 }
6410 /* Put the relocation back out. We have to use the special
6411 relocation outputter in the 64-bit case since the 64-bit
6412 relocation format is non-standard. */
6414 {
6419 }
6420 else
6426 /* Record the index of the first relocation referencing H. This
6427 information is later emitted in the .msym section. */
6433 /* We've now added another relocation. */
6436 /* Make sure the output section is writable. The dynamic linker
6437 will be writing to it. */
6441 /* On IRIX5, make an entry of compact relocation info. */
6443 {
6448 {
6449 Elf32_crinfo cptrel;
6457 else
6468 }
6469 }
6472 }
6474 /* Calculate the value produced by the RELOCATION (which comes from
6475 the INPUT_BFD). The ADDEND is the addend to use for this
6476 RELOCATION; RELOCATION->R_ADDEND is ignored.
6478 The result of the relocation calculation is stored in VALUEP.
6479 REQUIRE_JALXP indicates whether or not the opcode used with this
6480 relocation must be JALX.
6482 This function returns bfd_reloc_continue if the caller need take no
6483 further action regarding this relocation, bfd_reloc_notsupported if
6484 something goes dramatically wrong, bfd_reloc_overflow if an
6485 overflow occurs, and bfd_reloc_ok to indicate success. */
6487 static bfd_reloc_status_type
6489 input_bfd,
6490 input_section,
6491 info,
6492 relocation,
6493 addend,
6494 howto,
6495 local_syms,
6496 local_sections,
6497 valuep,
6498 namep,
6499 require_jalxp)
6505 bfd_vma addend;
6512 {
6513 /* The eventual value we will return. */
6514 bfd_vma value;
6515 /* The address of the symbol against which the relocation is
6516 occurring. */
6518 /* The final GP value to be used for the relocatable, executable, or
6519 shared object file being produced. */
6521 /* The place (section offset or address) of the storage unit being
6522 relocated. */
6523 bfd_vma p;
6524 /* The value of GP used to create the relocatable object. */
6526 /* The offset into the global offset table at which the address of
6527 the relocation entry symbol, adjusted by the addend, resides
6528 during execution. */
6530 /* The section in which the symbol referenced by the relocation is
6531 located. */
6534 /* True if the symbol referred to by this relocation is a local
6535 symbol. */
6536 boolean local_p;
6537 /* True if the symbol referred to by this relocation is "_gp_disp". */
6543 /* True if overflow occurred during the calculation of the
6544 relocation value. */
6545 boolean overflowed_p;
6546 /* True if this relocation refers to a MIPS16 function. */
6549 /* Parse the relocation. */
6556 /* Assume that there will be no overflow. */
6559 /* Figure out whether or not the symbol is local, and get the offset
6560 used in the array of hash table entries. */
6566 else
6567 {
6568 /* The symbol table does not follow the rule that local symbols
6569 must come before globals. */
6571 }
6573 /* Figure out the value of the symbol. */
6575 {
6585 /* MIPS16 text labels should be treated as odd. */
6589 /* Record the name of this symbol, for our caller. */
6597 }
6598 else
6599 {
6600 /* For global symbols we look up the symbol in the hash-table. */
6603 /* Find the real hash-table entry for this symbol. */
6608 /* Record the name of this symbol, for our caller. */
6611 /* See if this is the special _gp_disp symbol. Note that such a
6612 symbol must always be a global symbol. */
6614 {
6615 /* Relocations against _gp_disp are permitted only with
6616 R_MIPS_HI16 and R_MIPS_LO16 relocations. */
6621 }
6622 /* If this symbol is defined, calculate its address. Note that
6623 _gp_disp is a magic symbol, always implicitly defined by the
6624 linker, so it's inappropriate to check to see whether or not
6625 its defined. */
6629 {
6635 else
6637 }
6639 /* We allow relocations against undefined weak symbols, giving
6640 it the value zero, so that you can undefined weak functions
6641 and check to see if they exist by looking at their
6642 addresses. */
6651 {
6652 /* If this is a dynamic link, we should have created a
6653 _DYNAMIC_LINK symbol or _DYNAMIC_LINKING(for normal mips) symbol
6654 in in mips_elf_create_dynamic_sections.
6655 Otherwise, we should define the symbol with a value of 0.
6656 FIXME: It should probably get into the symbol table
6657 somehow as well. */
6661 }
6662 else
6663 {
6671 }
6674 }
6676 /* If this is a 32-bit call to a 16-bit function with a stub, we
6677 need to redirect the call to the stub, unless we're already *in*
6678 a stub. */
6684 {
6685 /* This is a 32-bit call to a 16-bit function. We should
6686 have already noticed that we were going to need the
6687 stub. */
6690 else
6691 {
6694 }
6697 }
6698 /* If this is a 16-bit call to a 32-bit function with a stub, we
6699 need to redirect the call to the stub. */
6704 {
6705 /* If both call_stub and call_fp_stub are defined, we can figure
6706 out which one to use by seeing which one appears in the input
6707 file. */
6709 {
6714 {
6717 {
6720 }
6721 }
6724 }
6727 else
6732 }
6734 /* Calls from 16-bit code to 32-bit code and vice versa require the
6735 special jalx instruction. */
6743 /* If we haven't already determined the GOT offset, or the GP value,
6744 and we're going to need it, get it now. */
6746 {
6754 /* Find the index into the GOT where this value is located. */
6756 {
6758 g = mips_elf_global_got_index
6765 {
6766 /* This is a static link or a -Bsymbolic link. The
6767 symbol is defined locally, or was forced to be local.
6768 We must initialize this entry in the GOT. */
6773 }
6774 }
6776 /* There's no need to create a local GOT entry here; the
6777 calculation for a local GOT16 entry does not involve G. */
6779 else
6780 {
6784 }
6786 /* Convert GOT indices to actual offsets. */
6803 }
6805 /* Figure out what kind of relocation is being performed. */
6807 {
6828 {
6829 /* If we're creating a shared library, or this relocation is
6830 against a symbol in a shared library, then we can't know
6831 where the symbol will end up. So, we create a relocation
6832 record in the output, and leave the job up to the dynamic
6833 linker. */
6836 info,
6837 relocation,
6838 h,
6839 sec,
6840 symbol,
6842 input_section))
6844 }
6845 else
6846 {
6849 else
6851 }
6874 /* The calculation for R_MIPS16_26 is just the same as for an
6875 R_MIPS_26. It's only the storage of the relocated field into
6876 the output file that's different. That's handled in
6877 mips_elf_perform_relocation. So, we just fall through to the
6878 R_MIPS_26 case here. */
6882 else
6889 {
6892 }
6893 else
6894 {
6897 }
6903 else
6904 {
6906 /* The MIPS ABI requires checking the R_MIPS_LO16 relocation
6907 for overflow. But, on, say, Irix 5, relocations against
6908 _gp_disp are normally generated from the .cpload
6909 pseudo-op. It generates code that normally looks like
6910 this:
6912 lui $gp,%hi(_gp_disp)
6913 addiu $gp,$gp,%lo(_gp_disp)
6914 addu $gp,$gp,$t9
6916 Here $t9 holds the address of the function being called,
6917 as required by the MIPS ELF ABI. The R_MIPS_LO16
6918 relocation can easily overflow in this situation, but the
6919 R_MIPS_HI16 relocation will handle the overflow.
6920 Therefore, we consider this a bug in the MIPS ABI, and do
6921 not check for overflow here. */
6922 }
6926 /* Because we don't merge literal sections, we can handle this
6927 just like R_MIPS_GPREL16. In the long run, we should merge
6928 shared literals, and then we will need to additional work
6929 here. */
6931 /* Fall through. */
6934 /* The R_MIPS16_GPREL performs the same calculation as
6935 R_MIPS_GPREL16, but stores the relocated bits in a different
6936 order. We don't need to do anything special here; the
6937 differences are handled in mips_elf_perform_relocation. */
6941 else
6949 {
6950 boolean forced;
6952 /* The special case is when the symbol is forced to be local. We
6953 need the full address in the GOT since no R_MIPS_LO16 relocation
6954 follows. */
6960 value
6962 abfd,
6963 value);
6966 }
6968 /* Fall through. */
6987 /* We're allowed to handle these two relocations identically.
6988 The dynamic linker is allowed to handle the CALL relocations
6989 differently by creating a lazy evaluation stub. */
7005 abfd,
7006 value);
7037 /* Both of these may be ignored. R_MIPS_JALR is an optimization
7038 hint; we could improve performance by honoring that hint. */
7043 /* We don't do anything with these at present. */
7047 /* An unrecognized relocation type. */
7049 }
7051 /* Store the VALUE for our caller. */
7054 }
7056 /* Obtain the field relocated by RELOCATION. */
7058 static bfd_vma
7064 {
7065 bfd_vma x;
7068 /* Obtain the bytes. */
7074 /* The two 16-bit words will be reversed on a little-endian
7075 system. See mips_elf_perform_relocation for more details. */
7079 }
7081 /* It has been determined that the result of the RELOCATION is the
7082 VALUE. Use HOWTO to place VALUE into the output file at the
7083 appropriate position. The SECTION is the section to which the
7084 relocation applies. If REQUIRE_JALX is true, then the opcode used
7085 for the relocation must be either JAL or JALX, and it is
7086 unconditionally converted to JALX.
7088 Returns false if anything goes wrong. */
7090 static boolean
7097 bfd_vma value;
7101 boolean require_jalx;
7102 {
7103 bfd_vma x;
7107 /* Figure out where the relocation is occurring. */
7110 /* Obtain the current value. */
7113 /* Clear the field we are setting. */
7116 /* If this is the R_MIPS16_26 relocation, we must store the
7117 value in a funny way. */
7119 {
7120 /* R_MIPS16_26 is used for the mips16 jal and jalx instructions.
7121 Most mips16 instructions are 16 bits, but these instructions
7122 are 32 bits.
7124 The format of these instructions is:
7126 +--------------+--------------------------------+
7127 ! JALX ! X! Imm 20:16 ! Imm 25:21 !
7128 +--------------+--------------------------------+
7129 ! Immediate 15:0 !
7130 +-----------------------------------------------+
7132 JALX is the 5-bit value 00011. X is 0 for jal, 1 for jalx.
7133 Note that the immediate value in the first word is swapped.
7135 When producing a relocateable object file, R_MIPS16_26 is
7136 handled mostly like R_MIPS_26. In particular, the addend is
7137 stored as a straight 26-bit value in a 32-bit instruction.
7138 (gas makes life simpler for itself by never adjusting a
7139 R_MIPS16_26 reloc to be against a section, so the addend is
7140 always zero). However, the 32 bit instruction is stored as 2
7141 16-bit values, rather than a single 32-bit value. In a
7142 big-endian file, the result is the same; in a little-endian
7143 file, the two 16-bit halves of the 32 bit value are swapped.
7144 This is so that a disassembler can recognize the jal
7145 instruction.
7147 When doing a final link, R_MIPS16_26 is treated as a 32 bit
7148 instruction stored as two 16-bit values. The addend A is the
7149 contents of the targ26 field. The calculation is the same as
7150 R_MIPS_26. When storing the calculated value, reorder the
7151 immediate value as shown above, and don't forget to store the
7152 value as two 16-bit values.
7154 To put it in MIPS ABI terms, the relocation field is T-targ26-16,
7155 defined as
7157 big-endian:
7158 +--------+----------------------+
7159 | | |
7160 | | targ26-16 |
7161 |31 26|25 0|
7162 +--------+----------------------+
7164 little-endian:
7165 +----------+------+-------------+
7166 | | | |
7167 | sub1 | | sub2 |
7168 |0 9|10 15|16 31|
7169 +----------+--------------------+
7170 where targ26-16 is sub1 followed by sub2 (i.e., the addend field A is
7171 ((sub1 << 16) | sub2)).
7173 When producing a relocateable object file, the calculation is
7174 (((A < 2) | ((P + 4) & 0xf0000000) + S) >> 2)
7175 When producing a fully linked file, the calculation is
7176 let R = (((A < 2) | ((P + 4) & 0xf0000000) + S) >> 2)
7177 ((R & 0x1f0000) << 5) | ((R & 0x3e00000) >> 5) | (R & 0xffff) */
7180 /* Shuffle the bits according to the formula above. */
7184 }
7186 {
7187 /* R_MIPS16_GPREL is used for GP-relative addressing in mips16
7188 mode. A typical instruction will have a format like this:
7190 +--------------+--------------------------------+
7191 ! EXTEND ! Imm 10:5 ! Imm 15:11 !
7192 +--------------+--------------------------------+
7193 ! Major ! rx ! ry ! Imm 4:0 !
7194 +--------------+--------------------------------+
7196 EXTEND is the five bit value 11110. Major is the instruction
7197 opcode.
7199 This is handled exactly like R_MIPS_GPREL16, except that the
7200 addend is retrieved and stored as shown in this diagram; that
7201 is, the Imm fields above replace the V-rel16 field.
7203 All we need to do here is shuffle the bits appropriately. As
7204 above, the two 16-bit halves must be swapped on a
7205 little-endian system. */
7209 }
7211 /* Set the field. */
7214 /* If required, turn JAL into JALX. */
7216 {
7217 boolean ok;
7219 bfd_vma jalx_opcode;
7221 /* Check to see if the opcode is already JAL or JALX. */
7223 {
7226 }
7227 else
7228 {
7231 }
7233 /* If the opcode is not JAL or JALX, there's a problem. */
7235 {
7243 }
7245 /* Make this the JALX opcode. */
7247 }
7249 /* Swap the high- and low-order 16 bits on little-endian systems
7250 when doing a MIPS16 relocation. */
7255 /* Put the value into the output. */
7258 }
7260 /* Returns true if SECTION is a MIPS16 stub section. */
7262 static boolean
7266 {
7272 }
7274 /* Relocate a MIPS ELF section. */
7276 boolean
7287 {
7297 {
7299 bfd_vma value;
7301 boolean require_jalx;
7302 /* True if the relocation is a RELA relocation, rather than a
7303 REL relocation. */
7308 /* Find the relocation howto for this relocation. */
7310 {
7311 /* Some 32-bit code uses R_MIPS_64. In particular, people use
7312 64-bit code, but make sure all their addresses are in the
7313 lowermost or uppermost 32-bit section of the 64-bit address
7314 space. Thus, when they use an R_MIPS_64 they mean what is
7315 usually meant by R_MIPS_32, with the exception that the
7316 stored value is sign-extended to 64 bits. */
7319 /* On big-endian systems, we need to lie about the position
7320 of the reloc. */
7323 }
7324 else
7328 {
7331 /* If these relocations were originally of the REL variety,
7332 we must pull the addend out of the field that will be
7333 relocated. Otherwise, we simply use the contents of the
7334 RELA relocation. To determine which flavor or relocation
7335 this is, we depend on the fact that the INPUT_SECTION's
7336 REL_HDR is read before its REL_HDR2. */
7342 {
7343 /* Note that this is a REL relocation. */
7346 /* Get the addend, which is stored in the input file. */
7348 rel,
7349 input_bfd,
7350 contents);
7353 /* For some kinds of relocations, the ADDEND is a
7354 combination of the addend stored in two different
7355 relocations. */
7361 {
7362 bfd_vma l;
7367 /* The combined value is the sum of the HI16 addend,
7368 left-shifted by sixteen bits, and the LO16
7369 addend, sign extended. (Usually, the code does
7370 a `lui' of the HI16 value, and then an `addiu' of
7371 the LO16 value.)
7373 Scan ahead to find a matching LO16 relocation. */
7376 else
7378 lo16_relocation
7383 /* Obtain the addend kept there. */
7386 lo16_relocation,
7393 /* Compute the combined addend. */
7395 }
7397 {
7398 /* The addend is scrambled in the object file. See
7399 mips_elf_perform_relocation for details on the
7400 format. */
7404 }
7405 }
7406 else
7408 }
7411 {
7419 /* Since we're just relocating, all we need to do is copy
7420 the relocations back out to the object file, unless
7421 they're against a section symbol, in which case we need
7422 to adjust by the section offset, or unless they're GP
7423 relative in which case we need to adjust by the amount
7424 that we're adjusting GP in this relocateable object. */
7428 /* There's nothing to do for non-local relocations. */
7439 /* The addend is stored without its two least
7440 significant bits (which are always zero.) In a
7441 non-relocateable link, calculate_relocation will do
7442 this shift; here, we must do it ourselves. */
7448 /* Adjust the addend appropriately. */
7451 /* If the relocation is for a R_MIPS_HI16 or R_MIPS_GOT16,
7452 then we only want to write out the high-order 16 bits.
7453 The subsequent R_MIPS_LO16 will handle the low-order bits. */
7457 /* If the relocation is for an R_MIPS_26 relocation, then
7458 the two low-order bits are not stored in the object file;
7459 they are implicitly zero. */
7465 /* If this is a RELA relocation, just update the addend.
7466 We have to cast away constness for REL. */
7468 else
7469 {
7470 /* Otherwise, we have to write the value back out. Note
7471 that we use the source mask, rather than the
7472 destination mask because the place to which we are
7473 writing will be source of the addend in the final
7474 link. */
7478 /* See the comment above about using R_MIPS_64 in the 32-bit
7479 ABI. Here, we need to update the addend. It would be
7480 possible to get away with just using the R_MIPS_32 reloc
7481 but for endianness. */
7482 {
7483 bfd_vma sign_bits;
7484 bfd_vma low_bits;
7485 bfd_vma high_bits;
7488 #ifdef BFD64
7490 #else
7492 #endif
7493 else
7496 /* If we don't know that we have a 64-bit type,
7497 do two separate stores. */
7499 {
7500 /* Store the sign-bits (which are most significant)
7501 first. */
7504 }
7505 else
7506 {
7509 }
7515 }
7521 }
7523 /* Go on to the next relocation. */
7525 }
7527 /* In the N32 and 64-bit ABIs there may be multiple consecutive
7528 relocations for the same offset. In that case we are
7529 supposed to treat the output of each relocation as the addend
7530 for the next. */
7535 else
7538 /* Figure out what value we are supposed to relocate. */
7540 input_bfd,
7541 input_section,
7542 info,
7543 rel,
7544 addend,
7545 howto,
7546 local_syms,
7547 local_sections,
7551 {
7553 /* There's nothing to do. */
7557 /* mips_elf_calculate_relocation already called the
7558 undefined_symbol callback. There's no real point in
7559 trying to perform the relocation at this point, so we
7560 just skip ahead to the next relocation. */
7571 /* Ignore overflow until we reach the last relocation for
7572 a given location. */
7573 ;
7574 else
7575 {
7581 }
7590 }
7592 /* If we've got another relocation for the address, keep going
7593 until we reach the last one. */
7595 {
7598 }
7601 /* See the comment above about using R_MIPS_64 in the 32-bit
7602 ABI. Until now, we've been using the HOWTO for R_MIPS_32;
7603 that calculated the right value. Now, however, we
7604 sign-extend the 32-bit result to 64-bits, and store it as a
7605 64-bit value. We are especially generous here in that we
7606 go to extreme lengths to support this usage on systems with
7607 only a 32-bit VMA. */
7608 {
7609 bfd_vma sign_bits;
7610 bfd_vma low_bits;
7611 bfd_vma high_bits;
7614 #ifdef BFD64
7616 #else
7618 #endif
7619 else
7622 /* If we don't know that we have a 64-bit type,
7623 do two separate stores. */
7625 {
7626 /* Undo what we did above. */
7628 /* Store the sign-bits (which are most significant)
7629 first. */
7632 }
7633 else
7634 {
7637 }
7643 }
7645 /* Actually perform the relocation. */
7648 require_jalx))
7650 }
7653 }
7655 /* This hook function is called before the linker writes out a global
7656 symbol. We mark symbols as small common if appropriate. This is
7657 also where we undo the increment of the value for a mips16 symbol. */
7659 boolean
7666 {
7667 /* If we see a common symbol, which implies a relocatable link, then
7668 if a symbol was small common in an input file, mark it as small
7669 common in the output file. */
7679 }
7680 \f
7681 /* Functions for the dynamic linker. */
7683 /* The name of the dynamic interpreter. This is put in the .interp
7684 section. */
7686 #define ELF_DYNAMIC_INTERPRETER(abfd) \
7691 /* Create dynamic sections when linking against a dynamic object. */
7693 boolean
7697 {
7699 flagword flags;
7706 /* Mips ABI requests the .dynamic section to be read only. */
7709 {
7712 }
7714 /* We need to create .got section. */
7718 /* Create the .msym section on IRIX6. It is used by the dynamic
7719 linker to speed up dynamic relocations, and to avoid computing
7720 the ELF hash for symbols. */
7725 /* Create .stub section. */
7728 {
7735 }
7740 {
7747 }
7749 /* On IRIX5, we adjust add some additional symbols and change the
7750 alignments of several sections. There is no ABI documentation
7751 indicating that this is necessary on IRIX6, nor any evidence that
7752 the linker takes such action. */
7754 {
7756 {
7770 }
7772 /* We need to create a .compact_rel section. */
7774 {
7777 }
7779 /* Change aligments of some sections. */
7795 }
7798 {
7801 {
7808 }
7809 else
7810 {
7811 /* For normal mips it is _DYNAMIC_LINKING. */
7818 }
7827 {
7828 /* __rld_map is a four byte word located in the .data section
7829 and is filled in by the rtld to contain a pointer to
7830 the _r_debug structure. Its symbol value will be set in
7831 mips_elf_finish_dynamic_symbol. */
7837 {
7844 }
7845 else
7846 {
7847 /* For normal mips the symbol is __RLD_MAP. */
7854 }
7861 }
7862 }
7865 }
7867 /* Create the .compact_rel section. */
7869 static boolean
7873 {
7874 flagword flags;
7878 {
7890 }
7893 }
7895 /* Create the .got section to hold the global offset table. */
7897 static boolean
7901 {
7902 flagword flags;
7906 bfd_size_type amt;
7908 /* This function may be called more than once. */
7921 /* Define the symbol _GLOBAL_OFFSET_TABLE_. We don't do this in the
7922 linker script because we don't want to define the symbol if we
7923 are not creating a global offset table. */
7939 /* The first several global offset table entries are reserved. */
7950 {
7955 }
7961 }
7963 /* Returns the .msym section for ABFD, creating it if it does not
7964 already exist. Returns NULL to indicate error. */
7969 {
7974 {
7978 SEC_ALLOC
7979 | SEC_LOAD
7980 | SEC_HAS_CONTENTS
7981 | SEC_LINKER_CREATED
7986 }
7989 }
7991 /* Add room for N relocations to the .rel.dyn section in ABFD. */
7993 static void
7997 {
8004 {
8005 /* Make room for a null element. */
8008 }
8010 }
8012 /* Look through the relocs for a section during the first phase, and
8013 allocate space in the global offset table. */
8015 boolean
8021 {
8042 /* Check for the mips16 stub sections. */
8046 {
8049 /* Look at the relocation information to figure out which symbol
8050 this is for. */
8056 {
8059 /* This stub is for a local symbol. This stub will only be
8060 needed if there is some relocation in this BFD, other
8061 than a 16 bit function call, which refers to this symbol. */
8063 {
8067 /* We can ignore stub sections when looking for relocs. */
8078 sec_relocs = (_bfd_elf32_link_read_relocs
8096 }
8099 {
8100 /* There is no non-call reloc for this stub, so we do
8101 not need it. Since this function is called before
8102 the linker maps input sections to output sections, we
8103 can easily discard it by setting the SEC_EXCLUDE
8104 flag. */
8107 }
8109 /* Record this stub in an array of local symbol stubs for
8110 this BFD. */
8112 {
8115 bfd_size_type amt;
8119 else
8126 }
8130 /* We don't need to set mips16_stubs_seen in this case.
8131 That flag is used to see whether we need to look through
8132 the global symbol table for stubs. We don't need to set
8133 it here, because we just have a local stub. */
8134 }
8135 else
8136 {
8142 /* H is the symbol this stub is for. */
8146 }
8147 }
8150 {
8155 /* Look at the relocation information to figure out which symbol
8156 this is for. */
8162 {
8163 /* This stub was actually built for a static symbol defined
8164 in the same file. We assume that all static symbols in
8165 mips16 code are themselves mips16, so we can simply
8166 discard this stub. Since this function is called before
8167 the linker maps input sections to output sections, we can
8168 easily discard it by setting the SEC_EXCLUDE flag. */
8171 }
8176 /* H is the symbol this stub is for. */
8180 else
8183 /* If we already have an appropriate stub for this function, we
8184 don't need another one, so we can discard this one. Since
8185 this function is called before the linker maps input sections
8186 to output sections, we can easily discard it by setting the
8187 SEC_EXCLUDE flag. We can also discard this section if we
8188 happen to already know that this is a mips16 function; it is
8189 not necessary to check this here, as it is checked later, but
8190 it is slightly faster to check now. */
8192 {
8195 }
8199 }
8202 {
8205 }
8206 else
8207 {
8211 else
8212 {
8216 }
8217 }
8223 {
8234 {
8240 }
8241 else
8242 {
8245 /* This may be an indirect symbol created because of a version. */
8247 {
8250 }
8251 }
8253 /* Some relocs require a global offset table. */
8255 {
8257 {
8285 }
8286 }
8291 {
8292 /* We may need a local GOT entry for this relocation. We
8293 don't count R_MIPS_GOT_PAGE because we can estimate the
8294 maximum number of pages needed by looking at the size of
8295 the segment. Similar comments apply to R_MIPS_GOT16 and
8296 R_MIPS_CALL16. We don't count R_MIPS_GOT_HI16, or
8297 R_MIPS_CALL_HI16 because these are always followed by an
8298 R_MIPS_GOT_LO16 or R_MIPS_CALL_LO16.
8300 This estimation is very conservative since we can merge
8301 duplicate entries in the GOT. In order to be less
8302 conservative, we could actually build the GOT here,
8303 rather than in relocate_section. */
8306 }
8309 {
8312 {
8318 }
8319 /* Fall through. */
8324 {
8325 /* This symbol requires a global offset table entry. */
8329 /* We need a stub, not a plt entry for the undefined
8330 function. But we record it as if it needs plt. See
8331 elf_adjust_dynamic_symbol in elflink.h. */
8334 }
8341 /* This symbol requires a global offset table entry. */
8351 {
8353 {
8358 {
8362 (SEC_ALLOC
8363 | SEC_LOAD
8364 | SEC_HAS_CONTENTS
8365 | SEC_IN_MEMORY
8366 | SEC_LINKER_CREATED
8371 }
8372 }
8373 #define MIPS_READONLY_SECTION (SEC_ALLOC | SEC_LOAD | SEC_READONLY)
8375 {
8376 /* When creating a shared object, we must copy these
8377 reloc types into the output file as R_MIPS_REL32
8378 relocs. We make room for this reloc in the
8379 .rel.dyn reloc section. */
8383 /* We tell the dynamic linker that there are
8384 relocations against the text segment. */
8386 }
8387 else
8388 {
8391 /* We only need to copy this reloc if the symbol is
8392 defined in a dynamic object. */
8397 /* We need it to tell the dynamic linker if there
8398 are relocations against the text segment. */
8400 }
8402 /* Even though we don't directly need a GOT entry for
8403 this symbol, a symbol must have a dynamic symbol
8404 table index greater that DT_MIPS_GOTSYM if there are
8405 dynamic relocations against it. */
8409 }
8425 /* This relocation describes the C++ object vtable hierarchy.
8426 Reconstruct it for later use during GC. */
8432 /* This relocation describes which C++ vtable entries are actually
8433 used. Record for later use during GC. */
8441 }
8443 /* We must not create a stub for a symbol that has relocations
8444 related to taking the function's address. */
8446 {
8449 {
8454 }
8460 }
8462 /* If this reloc is not a 16 bit call, and it has a global
8463 symbol, then we will need the fn_stub if there is one.
8464 References from a stub section do not count. */
8473 {
8478 }
8479 }
8482 }
8484 /* Return the section that should be marked against GC for a given
8485 relocation. */
8487 asection *
8494 {
8495 /* ??? Do mips16 stub sections need to be handled special? */
8498 {
8500 {
8507 {
8517 }
8518 }
8519 }
8520 else
8521 {
8523 }
8526 }
8528 /* Update the got entry reference counts for the section being removed. */
8530 boolean
8536 {
8537 #if 0
8552 {
8559 /* ??? It would seem that the existing MIPS code does no sort
8560 of reference counting or whatnot on its GOT and PLT entries,
8561 so it is not possible to garbage collect them at this time. */
8566 }
8567 #endif
8570 }
8572 /* Copy data from a MIPS ELF indirect symbol to its direct symbol,
8573 hiding the old indirect symbol. Process additional relocation
8574 information. Also called for weakdefs, in which case we just let
8575 _bfd_elf_link_hash_copy_indirect copy the flags for us. */
8577 static void
8580 {
8599 }
8601 /* Adjust a symbol defined by a dynamic object and referenced by a
8602 regular object. The current definition is in some section of the
8603 dynamic object, but we're not including those sections. We have to
8604 change the definition to something the rest of the link can
8605 understand. */
8607 boolean
8611 {
8618 /* Make sure we know what is going on here. */
8629 /* If this symbol is defined in a dynamic object, we need to copy
8630 any R_MIPS_32 or R_MIPS_REL32 relocs against it into the output
8631 file. */
8638 {
8642 /* We tell the dynamic linker that there are relocations
8643 against the text segment. */
8645 }
8647 /* For a function, create a stub, if allowed. */
8650 {
8654 /* If this symbol is not defined in a regular file, then set
8655 the symbol to the stub location. This is required to make
8656 function pointers compare as equal between the normal
8657 executable and the shared library. */
8659 {
8660 /* We need .stub section. */
8668 /* XXX Write this stub address somewhere. */
8671 /* Make room for this stub code. */
8674 /* The last half word of the stub will be filled with the index
8675 of this symbol in .dynsym section. */
8677 }
8678 }
8681 {
8682 /* This will set the entry for this symbol in the GOT to 0, and
8683 the dynamic linker will take care of this. */
8686 }
8688 /* If this is a weak symbol, and there is a real definition, the
8689 processor independent code will have arranged for us to see the
8690 real definition first, and we can just use the same value. */
8692 {
8698 }
8700 /* This is a reference to a symbol defined by a dynamic object which
8701 is not a function. */
8704 }
8706 /* This function is called after all the input files have been read,
8707 and the input sections have been assigned to output sections. We
8708 check for any mips16 stub sections that we can discard. */
8710 static boolean mips_elf_check_mips16_stubs
8713 boolean
8717 {
8720 /* The .reginfo section has a fixed size. */
8731 mips_elf_check_mips16_stubs,
8735 }
8737 /* Check the mips16 stubs for a particular symbol, and see if we can
8738 discard them. */
8740 static boolean
8743 PTR data ATTRIBUTE_UNUSED;
8744 {
8747 {
8748 /* We don't need the fn_stub; the only references to this symbol
8749 are 16 bit calls. Clobber the size to 0 to prevent it from
8750 being included in the link. */
8756 }
8760 {
8761 /* We don't need the call_stub; this is a 16 bit function, so
8762 calls from other 16 bit functions are OK. Clobber the size
8763 to 0 to prevent it from being included in the link. */
8769 }
8773 {
8774 /* We don't need the call_stub; this is a 16 bit function, so
8775 calls from other 16 bit functions are OK. Clobber the size
8776 to 0 to prevent it from being included in the link. */
8782 }
8785 }
8787 /* Set the sizes of the dynamic sections. */
8789 boolean
8793 {
8796 boolean reltext;
8803 {
8804 /* Set the contents of the .interp section to the interpreter. */
8806 {
8809 s->_raw_size
8811 s->contents
8813 }
8814 }
8816 /* The check_relocs and adjust_dynamic_symbol entry points have
8817 determined the sizes of the various dynamic sections. Allocate
8818 memory for them. */
8821 {
8823 boolean strip;
8825 /* It's OK to base decisions on the section name, because none
8826 of the dynobj section names depend upon the input files. */
8835 {
8837 {
8838 /* We only strip the section if the output section name
8839 has the same name. Otherwise, there might be several
8840 input sections for this output section. FIXME: This
8841 code is probably not needed these days anyhow, since
8842 the linker now does not create empty output sections. */
8848 }
8849 else
8850 {
8854 /* If this relocation section applies to a read only
8855 section, then we probably need a DT_TEXTREL entry.
8856 If the relocation section is .rel.dyn, we always
8857 assert a DT_TEXTREL entry rather than testing whether
8858 there exists a relocation to a read only section or
8859 not. */
8870 /* We use the reloc_count field as a counter if we need
8871 to copy relocs into the output file. */
8875 }
8876 }
8878 {
8881 bfd_size_type local_gotno;
8888 /* Calculate the total loadable size of the output. That
8889 will give us the maximum number of GOT_PAGE entries
8890 required. */
8892 {
8896 subsection;
8898 {
8903 }
8904 }
8907 /* Assume there are two loadable segments consisting of
8908 contiguous sections. Is 5 enough? */
8911 /* It's possible we will need GOT_PAGE entries as well as
8912 GOT16 entries. Often, these will be able to share GOT
8913 entries, but not always. */
8919 /* There has to be a global GOT entry for every symbol with
8920 a dynamic symbol table index of DT_MIPS_GOTSYM or
8921 higher. Therefore, it make sense to put those symbols
8922 that need GOT entries at the end of the symbol table. We
8923 do that here. */
8929 else
8930 /* If there are no global symbols, or none requiring
8931 relocations, then GLOBAL_GOTSYM will be NULL. */
8935 }
8937 {
8938 /* Irix rld assumes that the function stub isn't at the end
8939 of .text section. So put a dummy. XXX */
8941 }
8945 {
8946 /* We add a room for __rld_map. It will be filled in by the
8947 rtld to contain a pointer to the _r_debug structure. */
8949 }
8959 {
8960 /* It's not one of our sections, so don't allocate space. */
8962 }
8965 {
8968 }
8970 /* Allocate memory for the section contents. */
8973 {
8976 }
8977 }
8980 {
8981 /* Add some entries to the .dynamic section. We fill in the
8982 values later, in elf_mips_finish_dynamic_sections, but we
8983 must add the entries now so that we get the correct size for
8984 the .dynamic section. The DT_DEBUG entry is filled in by the
8985 dynamic linker and used by the debugger. */
8987 {
8988 /* SGI object has the equivalence of DT_DEBUG in the
8989 DT_MIPS_RLD_MAP entry. */
8993 {
8996 }
8997 }
8998 else
8999 {
9000 /* Shared libraries on traditional mips have DT_DEBUG. */
9002 {
9005 }
9006 }
9012 {
9015 }
9022 {
9031 }
9034 {
9037 }
9040 {
9043 }
9046 {
9055 }
9063 #if 0
9064 /* Time stamps in executable files are a bad idea. */
9067 #endif
9072 #endif
9077 #endif
9099 && (bfd_get_section_by_name
9108 }
9111 }
9113 /* If NAME is one of the special IRIX6 symbols defined by the linker,
9114 adjust it appropriately now. */
9116 static void
9121 {
9122 /* The linker script takes care of providing names and values for
9123 these, but we must place them into the right sections. */
9130 NULL
9131 };
9138 NULL
9139 };
9149 {
9150 /* All of these symbols are given type STT_SECTION by the
9151 IRIX6 linker. */
9154 /* The IRIX linker puts these symbols in special sections. */
9157 else
9161 }
9162 }
9164 /* Finish up dynamic symbol handling. We set the contents of various
9165 dynamic sections here. */
9167 boolean
9173 {
9175 bfd_vma gval;
9187 {
9192 /* This symbol has a stub. Set it up. */
9200 /* Fill the stub. */
9207 /* FIXME: Can h->dynindex be more than 64K? */
9218 /* Mark the symbol as undefined. plt.offset != -1 occurs
9219 only for the referenced symbol. */
9222 /* The run-time linker uses the st_value field of the symbol
9223 to reset the global offset table entry for this external
9224 to its stub address when unlinking a shared object. */
9227 }
9238 /* Run through the global symbol table, creating GOT entries for all
9239 the symbols that need them. */
9242 {
9243 bfd_vma offset;
9244 bfd_vma value;
9248 else
9249 {
9250 /* For an entity defined in a shared object, this will be
9251 NULL. (For functions in shared objects for
9252 which we have created stubs, ST_VALUE will be non-NULL.
9253 That's because such the functions are now no longer defined
9254 in a shared object.) */
9258 else
9260 }
9263 }
9265 /* Create a .msym entry, if appropriate. */
9269 {
9270 Elf32_Internal_Msym msym;
9273 /* It is undocumented what the `1' indicates, but IRIX6 uses
9274 this value. */
9276 bfd_mips_elf_swap_msym_out
9279 }
9281 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
9288 {
9292 }
9294 {
9298 }
9300 {
9303 {
9308 }
9310 {
9315 }
9317 {
9322 }
9323 }
9325 /* Handle the IRIX6-specific symbols. */
9330 {
9334 {
9341 }
9344 {
9345 /* IRIX6 does not use a .rld_map section. */
9351 }
9352 }
9354 /* If this is a mips16 symbol, force the value to be even. */
9360 }
9362 /* Finish up the dynamic sections. */
9364 boolean
9368 {
9381 else
9382 {
9386 }
9389 {
9398 {
9399 Elf_Internal_Dyn dyn;
9403 boolean swap_out_p;
9405 /* Read in the current dynamic entry. */
9408 /* Assume that we're going to modify it and write it out. */
9412 {
9414 s = (bfd_get_section_by_name
9422 /* Rewrite DT_STRSZ. */
9435 get_vma:
9457 set_elemno:
9460 {
9463 else
9465 }
9466 else
9475 /* XXX FIXME: */
9480 /* XXX FIXME: */
9495 /* The index into the dynamic symbol table which is the
9496 entry of the first external symbol that is not
9497 referenced within the same object. */
9503 {
9506 }
9507 /* In case if we don't have global got symbols we default
9508 to setting DT_MIPS_GOTSYM to the same value as
9509 DT_MIPS_SYMTABNO, so we just fall through. */
9519 else
9532 s = (bfd_get_section_by_name
9538 s = (bfd_get_section_by_name
9546 }
9551 }
9552 }
9554 /* The first entry of the global offset table will be filled at
9555 runtime. The second entry will be used by some runtime loaders.
9556 This isn't the case of Irix rld. */
9558 {
9562 }
9568 {
9571 Elf32_compact_rel cpt;
9573 /* ??? The section symbols for the output sections were set up in
9574 _bfd_elf_final_link. SGI sets the STT_NOTYPE attribute for these
9575 symbols. Should we do so? */
9580 {
9581 Elf32_Internal_Msym msym;
9587 {
9590 bfd_mips_elf_swap_msym_out
9594 }
9595 }
9598 {
9599 /* Write .compact_rel section out. */
9602 {
9614 /* Clean up a dummy stub function entry in .text. */
9618 {
9619 file_ptr dummy_offset;
9624 MIPS_FUNCTION_STUB_SIZE);
9625 }
9626 }
9627 }
9629 /* We need to sort the entries of the dynamic relocation section. */
9632 {
9638 {
9643 }
9644 }
9646 /* Clean up a first relocation in .rel.dyn. */
9651 }
9654 }
9655 \f
9656 /* Support for core dump NOTE sections */
9657 static boolean
9661 {
9666 {
9671 /* pr_cursig */
9674 /* pr_pid */
9677 /* pr_reg */
9682 }
9684 /* Make a ".reg/999" section. */
9687 }
9689 static boolean
9693 {
9695 {
9704 }
9706 /* Note that for some reason, a spurious space is tacked
9707 onto the end of the args in some (at least one anyway)
9708 implementations, so strip it off if it exists. */
9710 {
9716 }
9719 }
9720 \f
9721 #define PDR_SIZE 32
9723 static boolean
9728 {
9754 {
9757 }
9764 {
9766 {
9768 skip ++;
9769 }
9770 }
9773 {
9777 }
9778 else
9785 }
9787 static boolean
9790 {
9794 }
9796 static boolean
9801 {
9816 {
9822 }
9827 }
9828 \f
9829 /* This is almost identical to bfd_generic_get_... except that some
9830 MIPS relocations need to be handled specially. Sigh. */
9839 boolean relocateable;
9841 {
9842 /* Get enough memory to hold the stuff */
9857 /* read in the section */
9859 input_section,
9865 /* We're not relaxing the section, so just copy the size info */
9870 input_section,
9871 reloc_vector,
9872 symbols);
9877 {
9879 /* for mips */
9883 {
9886 /* Skip all this stuff if we aren't mixing formats. */
9890 else
9891 {
9894 }
9895 lookup:
9897 {
9899 {
9913 /* @@FIXME ignoring warning for now */
9918 }
9919 }
9920 else
9922 }
9923 /* end mips */
9925 parent++)
9926 {
9928 bfd_reloc_status_type r;
9930 /* Specific to MIPS: Deal with relocation types that require
9931 knowing the gp of the output bfd. */
9934 {
9935 /* The special_function wouldn't get called anyways. */
9936 }
9938 {
9939 /* The gp isn't there; let the special function code
9940 fall over on its own. */
9941 }
9944 {
9945 /* bypass special_function call */
9949 }
9950 /* end mips specific stuff */
9955 input_section,
9958 skip_bfd_perform_relocation:
9961 {
9964 /* A partial link, so keep the relocs */
9967 }
9970 {
9972 {
9998 }
10000 }
10001 }
10002 }
10007 error_return:
10011 }
10013 #define bfd_elf32_bfd_get_relocated_section_contents \
10014 elf32_mips_get_relocated_section_contents
10015 \f
10016 /* ECOFF swapping routines. These are used when dealing with the
10017 .mdebug section, which is in the ECOFF debugging format. */
10019 /* Symbol table magic number. */
10020 magicSym,
10021 /* Alignment of debugging information. E.g., 4. */
10023 /* Sizes of external symbolic information. */
10032 /* Functions to swap in external symbolic data. */
10033 ecoff_swap_hdr_in,
10034 ecoff_swap_dnr_in,
10035 ecoff_swap_pdr_in,
10036 ecoff_swap_sym_in,
10037 ecoff_swap_opt_in,
10038 ecoff_swap_fdr_in,
10039 ecoff_swap_rfd_in,
10040 ecoff_swap_ext_in,
10041 _bfd_ecoff_swap_tir_in,
10042 _bfd_ecoff_swap_rndx_in,
10043 /* Functions to swap out external symbolic data. */
10044 ecoff_swap_hdr_out,
10045 ecoff_swap_dnr_out,
10046 ecoff_swap_pdr_out,
10047 ecoff_swap_sym_out,
10048 ecoff_swap_opt_out,
10049 ecoff_swap_fdr_out,
10050 ecoff_swap_rfd_out,
10051 ecoff_swap_ext_out,
10052 _bfd_ecoff_swap_tir_out,
10053 _bfd_ecoff_swap_rndx_out,
10054 /* Function to read in symbolic data. */
10055 _bfd_mips_elf_read_ecoff_info
10056 };
10057 \f
10058 #define ELF_ARCH bfd_arch_mips
10059 #define ELF_MACHINE_CODE EM_MIPS
10061 /* The SVR4 MIPS ABI says that this should be 0x10000, but Irix 5 uses
10062 a value of 0x1000, and we are compatible. */
10063 #define ELF_MAXPAGESIZE 0x1000
10065 #define elf_backend_collect true
10066 #define elf_backend_type_change_ok true
10067 #define elf_backend_can_gc_sections true
10068 #define elf_info_to_howto mips_info_to_howto_rela
10069 #define elf_info_to_howto_rel mips_info_to_howto_rel
10070 #define elf_backend_sym_is_global mips_elf_sym_is_global
10071 #define elf_backend_object_p _bfd_mips_elf_object_p
10072 #define elf_backend_symbol_processing _bfd_mips_elf_symbol_processing
10073 #define elf_backend_section_processing _bfd_mips_elf_section_processing
10074 #define elf_backend_section_from_shdr _bfd_mips_elf_section_from_shdr
10075 #define elf_backend_fake_sections _bfd_mips_elf_fake_sections
10076 #define elf_backend_section_from_bfd_section \
10077 _bfd_mips_elf_section_from_bfd_section
10078 #define elf_backend_add_symbol_hook _bfd_mips_elf_add_symbol_hook
10079 #define elf_backend_link_output_symbol_hook \
10080 _bfd_mips_elf_link_output_symbol_hook
10081 #define elf_backend_create_dynamic_sections \
10082 _bfd_mips_elf_create_dynamic_sections
10083 #define elf_backend_check_relocs _bfd_mips_elf_check_relocs
10084 #define elf_backend_adjust_dynamic_symbol \
10085 _bfd_mips_elf_adjust_dynamic_symbol
10086 #define elf_backend_always_size_sections \
10087 _bfd_mips_elf_always_size_sections
10088 #define elf_backend_size_dynamic_sections \
10089 _bfd_mips_elf_size_dynamic_sections
10090 #define elf_backend_relocate_section _bfd_mips_elf_relocate_section
10091 #define elf_backend_finish_dynamic_symbol \
10092 _bfd_mips_elf_finish_dynamic_symbol
10093 #define elf_backend_finish_dynamic_sections \
10094 _bfd_mips_elf_finish_dynamic_sections
10095 #define elf_backend_final_write_processing \
10096 _bfd_mips_elf_final_write_processing
10097 #define elf_backend_additional_program_headers \
10098 _bfd_mips_elf_additional_program_headers
10099 #define elf_backend_modify_segment_map _bfd_mips_elf_modify_segment_map
10100 #define elf_backend_gc_mark_hook _bfd_mips_elf_gc_mark_hook
10101 #define elf_backend_gc_sweep_hook _bfd_mips_elf_gc_sweep_hook
10102 #define elf_backend_copy_indirect_symbol \
10103 _bfd_mips_elf_copy_indirect_symbol
10104 #define elf_backend_hide_symbol _bfd_mips_elf_hide_symbol
10105 #define elf_backend_grok_prstatus _bfd_elf32_mips_grok_prstatus
10106 #define elf_backend_grok_psinfo _bfd_elf32_mips_grok_psinfo
10107 #define elf_backend_ecoff_debug_swap &mips_elf32_ecoff_debug_swap
10109 #define elf_backend_got_header_size (4 * MIPS_RESERVED_GOTNO)
10110 #define elf_backend_plt_header_size 0
10111 #define elf_backend_may_use_rel_p 1
10112 #define elf_backend_may_use_rela_p 0
10113 #define elf_backend_default_use_rela_p 0
10114 #define elf_backend_sign_extend_vma true
10116 #define elf_backend_discard_info _bfd_elf32_mips_discard_info
10117 #define elf_backend_ignore_discarded_relocs \
10118 _bfd_elf32_mips_ignore_discarded_relocs
10119 #define elf_backend_write_section _bfd_elf32_mips_write_section
10121 #define bfd_elf32_bfd_is_local_label_name \
10122 mips_elf_is_local_label_name
10123 #define bfd_elf32_find_nearest_line _bfd_mips_elf_find_nearest_line
10124 #define bfd_elf32_set_section_contents _bfd_mips_elf_set_section_contents
10125 #define bfd_elf32_bfd_link_hash_table_create \
10126 _bfd_mips_elf_link_hash_table_create
10127 #define bfd_elf32_bfd_final_link _bfd_mips_elf_final_link
10128 #define bfd_elf32_bfd_merge_private_bfd_data \
10129 _bfd_mips_elf_merge_private_bfd_data
10130 #define bfd_elf32_bfd_set_private_flags _bfd_mips_elf_set_private_flags
10131 #define bfd_elf32_bfd_print_private_bfd_data \
10132 _bfd_mips_elf_print_private_bfd_data
10134 /* Support for SGI-ish mips targets. */
10135 #define TARGET_LITTLE_SYM bfd_elf32_littlemips_vec
10137 #define TARGET_BIG_SYM bfd_elf32_bigmips_vec
10142 /* Support for traditional mips targets. */
10145 #undef TARGET_LITTLE_SYM
10146 #undef TARGET_LITTLE_NAME
10147 #undef TARGET_BIG_SYM
10148 #undef TARGET_BIG_NAME
10150 #define TARGET_LITTLE_SYM bfd_elf32_tradlittlemips_vec
10152 #define TARGET_BIG_SYM bfd_elf32_tradbigmips_vec
10155 /* Include the target file again for this target */