| blob | 41c4309591493b4f8edc36a3cd4d9e645e38ebfb |
1 /* MIPS-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
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. */
1794 /* The low order 16 bits are always treated as a signed
1795 value. Therefore, a negative value in the low order bits
1796 requires an adjustment in the high order bits. We need
1797 to make this adjustment in two ways: once for the bits we
1798 took from the data, and once for the bits we are putting
1799 back in to the data. */
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 /* Copy backend specific data from one object module to another */
3041 boolean
3045 {
3058 }
3060 /* Merge backend specific data from an object file to the output
3061 object file when linking. */
3063 boolean
3067 {
3068 flagword old_flags;
3069 flagword new_flags;
3070 boolean ok;
3074 /* Check if we have the same endianess */
3087 {
3095 {
3099 }
3102 }
3104 /* Check flag compatibility. */
3112 /* Check to see if the input BFD actually contains any sections.
3113 If not, its flags may not have been initialised either, but it cannot
3114 actually cause any incompatibility. */
3116 {
3117 /* Ignore synthetic sections and empty .text, .data and .bss sections
3118 which are automatically generated by gas. */
3125 {
3128 }
3129 }
3136 {
3143 }
3146 {
3153 }
3155 /* Compare the ISA's. */
3158 {
3164 /* If either has no machine specified, just compare the general isa's.
3165 Some combinations of machines are ok, if the isa's match. */
3167 || ! old_mach
3169 )
3170 {
3171 /* Don't warn about mixing code using 32-bit ISAs, or mixing code
3172 using 64-bit ISAs. They will normally use the same data sizes
3173 and calling conventions. */
3177 {
3182 }
3183 }
3185 else
3186 {
3193 }
3197 }
3199 /* Compare ABI's. The 64-bit ABI does not use EF_MIPS_ABI. But, it
3200 does set EI_CLASS differently from any 32-bit ABI. */
3204 {
3205 /* Only error if both are set (to different values). */
3209 {
3216 }
3219 }
3221 /* Warn about any other mismatches */
3223 {
3229 }
3232 {
3235 }
3238 }
3239 \f
3240 boolean
3243 PTR ptr;
3244 {
3249 /* Print normal ELF private data. */
3252 /* xgettext:c-format */
3269 else
3286 else
3291 else
3297 }
3298 \f
3299 /* Handle a MIPS specific section when reading an object file. This
3300 is called when elfcode.h finds a section with an unknown type.
3301 This routine supports both the 32-bit and 64-bit ELF ABI.
3303 FIXME: We need to handle the SHF_MIPS_GPREL flag, but I'm not sure
3304 how to. */
3306 boolean
3311 {
3314 /* There ought to be a place to keep ELF backend specific flags, but
3315 at the moment there isn't one. We just keep track of the
3316 sections by their name, instead. Fortunately, the ABI gives
3317 suggested names for all the MIPS specific sections, so we will
3318 probably get away with this. */
3320 {
3380 }
3386 {
3392 }
3394 /* FIXME: We should record sh_info for a .gptab section. */
3396 /* For a .reginfo section, set the gp value in the tdata information
3397 from the contents of this section. We need the gp value while
3398 processing relocs, so we just get it now. The .reginfo section
3399 is not used in the 64-bit MIPS ELF ABI. */
3401 {
3402 Elf32_External_RegInfo ext;
3403 Elf32_RegInfo s;
3411 }
3413 /* For a SHT_MIPS_OPTIONS section, look for a ODK_REGINFO entry, and
3414 set the gp value based on what we find. We may see both
3415 SHT_MIPS_REGINFO and SHT_MIPS_OPTIONS/ODK_REGINFO; in that case,
3416 they should agree. */
3418 {
3426 {
3429 }
3433 {
3434 Elf_Internal_Options intopt;
3439 {
3440 Elf64_Internal_RegInfo intreg;
3442 bfd_mips_elf64_swap_reginfo_in
3448 }
3450 {
3451 Elf32_RegInfo intreg;
3453 bfd_mips_elf32_swap_reginfo_in
3459 }
3461 }
3463 }
3466 }
3468 /* Set the correct type for a MIPS ELF section. We do this by the
3469 section name, which is a hack, but ought to work. This routine is
3470 used by both the 32-bit and the 64-bit ABI. */
3472 boolean
3477 {
3483 {
3486 /* The sh_link field is set in final_write_processing. */
3487 }
3491 {
3494 /* The sh_info field is set in final_write_processing. */
3495 }
3499 {
3501 /* In a shared object on Irix 5.3, the .mdebug section has an
3502 entsize of 0. FIXME: Does this matter? */
3505 else
3507 }
3509 {
3511 /* In a shared object on Irix 5.3, the .reginfo section has an
3512 entsize of 0x18. FIXME: Does this matter? */
3514 {
3517 else
3519 }
3520 else
3522 }
3527 {
3530 #if 0
3531 /* This isn't how the Irix 6 linker behaves. */
3533 #endif
3534 }
3543 {
3546 }
3548 {
3551 /* The sh_info field is set in final_write_processing. */
3552 }
3554 {
3558 }
3562 {
3564 /* The sh_link and sh_info fields are set in
3565 final_write_processing. */
3566 }
3570 {
3573 /* The sh_link field is set in final_write_processing. */
3574 }
3576 {
3580 }
3582 /* The generic elf_fake_sections will set up REL_HDR using the
3583 default kind of relocations. But, we may actually need both
3584 kinds of relocations, so we set up the second header here. */
3586 {
3597 }
3600 }
3602 /* Given a BFD section, try to locate the corresponding ELF section
3603 index. This is used by both the 32-bit and the 64-bit ABI.
3604 Actually, it's not clear to me that the 64-bit ABI supports these,
3605 but for non-PIC objects we will certainly want support for at least
3606 the .scommon section. */
3608 boolean
3614 {
3616 {
3619 }
3621 {
3624 }
3626 }
3628 /* When are writing out the .options or .MIPS.options section,
3629 remember the bytes we are writing out, so that we can install the
3630 GP value in the section_processing routine. */
3632 boolean
3635 sec_ptr section;
3636 PTR location;
3637 file_ptr offset;
3638 bfd_size_type count;
3639 {
3641 {
3645 {
3650 }
3653 {
3654 bfd_size_type size;
3658 else
3664 }
3667 }
3670 count);
3671 }
3673 /* Work over a section just before writing it out. This routine is
3674 used by both the 32-bit and the 64-bit ABI. FIXME: We recognize
3675 sections that need the SHF_MIPS_GPREL flag by name; there has to be
3676 a better way. */
3678 boolean
3682 {
3685 {
3698 }
3704 {
3707 /* We stored the section contents in the elf_section_data tdata
3708 field in the set_section_contents routine. We save the
3709 section contents so that we don't have to read them again.
3710 At this point we know that elf_gp is set, so we can look
3711 through the section contents to see if there is an
3712 ODK_REGINFO structure. */
3718 {
3719 Elf_Internal_Options intopt;
3724 {
3737 }
3739 {
3752 }
3754 }
3755 }
3758 {
3764 {
3767 }
3769 {
3772 }
3774 {
3777 }
3779 {
3782 }
3784 {
3786 {
3792 }
3793 }
3794 }
3797 }
3798 \f
3799 /* MIPS ELF uses two common sections. One is the usual one, and the
3800 other is for small objects. All the small objects are kept
3801 together, and then referenced via the gp pointer, which yields
3802 faster assembler code. This is what we use for the small common
3803 section. This approach is copied from ecoff.c. */
3808 /* MIPS ELF also uses an acommon section, which represents an
3809 allocated common symbol which may be overridden by a
3810 definition in a shared library. */
3815 /* Handle the special MIPS section numbers that a symbol may use.
3816 This is used for both the 32-bit and the 64-bit ABI. */
3818 void
3822 {
3827 {
3829 /* This section is used in a dynamically linked executable file.
3830 It is an allocated common section. The dynamic linker can
3831 either resolve these symbols to something in a shared
3832 library, or it can just leave them here. For our purposes,
3833 we can consider these symbols to be in a new section. */
3835 {
3836 /* Initialize the acommon section. */
3846 }
3851 /* Common symbols less than the GP size are automatically
3852 treated as SHN_MIPS_SCOMMON symbols on IRIX5. */
3856 /* Fall through. */
3859 {
3860 /* Initialize the small common section. */
3870 }
3887 #endif
3888 }
3889 }
3890 \f
3891 /* When creating an Irix 5 executable, we need REGINFO and RTPROC
3892 segments. */
3894 int
3897 {
3901 /* See if we need a PT_MIPS_REGINFO segment. */
3906 /* See if we need a PT_MIPS_OPTIONS segment. */
3912 /* See if we need a PT_MIPS_RTPROC segment. */
3919 }
3921 /* Modify the segment map for an Irix 5 executable. */
3923 boolean
3926 {
3929 bfd_size_type amt;
3931 /* If there is a .reginfo section, we need a PT_MIPS_REGINFO
3932 segment. */
3935 {
3940 {
3950 /* We want to put it after the PHDR and INTERP segments. */
3959 }
3960 }
3962 /* For IRIX 6, we don't have .mdebug sections, nor does anything but
3963 .dynamic end up in PT_DYNAMIC. However, we do have to insert a
3964 PT_OPTIONS segement immediately following the program header
3965 table. */
3967 {
3973 {
3976 /* Usually, there's a program header table. But, sometimes
3977 there's not (like when running the `ld' testsuite). So,
3978 if there's no program header table, we just put the
3979 options segement at the end. */
3995 }
3996 }
3997 else
3998 {
4000 {
4001 /* If there are .dynamic and .mdebug sections, we make a room
4002 for the RTPROC header. FIXME: Rewrite without section names. */
4006 {
4011 {
4021 {
4025 }
4026 else
4027 {
4030 }
4032 /* We want to put it after the DYNAMIC segment. */
4041 }
4042 }
4043 }
4044 /* On Irix 5, the PT_DYNAMIC segment includes the .dynamic,
4045 .dynstr, .dynsym, and .hash sections, and everything in
4046 between. */
4053 {
4054 /* For a normal mips executable the permissions for the PT_DYNAMIC
4055 segment are read, write and execute. We do that here since
4056 the code in elf.c sets only the read permission. This matters
4057 sometimes for the dynamic linker. */
4059 {
4062 }
4063 }
4066 {
4068 {
4070 };
4078 {
4081 {
4082 bfd_size_type sz;
4091 }
4092 }
4112 {
4118 {
4121 }
4122 }
4125 }
4126 }
4129 }
4130 \f
4131 /* The structure of the runtime procedure descriptor created by the
4132 loader for use by the static exception system. */
4147 #define cbRPDR sizeof (RPDR)
4148 #define rpdNil ((pRPDR) 0)
4150 /* Swap RPDR (runtime procedure table entry) for output. */
4152 static void ecoff_swap_rpdr_out
4155 static void
4160 {
4161 /* ECOFF_PUT_OFF was defined in ecoffswap.h. */
4175 #endif
4176 }
4177 \f
4178 /* Read ECOFF debugging information from a .mdebug section into a
4179 ecoff_debug_info structure. */
4181 boolean
4186 {
4206 /* The symbolic header contains absolute file offsets and sizes to
4207 read. */
4208 #define READ(ptr, offset, count, size, type) \
4209 if (symhdr->count == 0) \
4210 debug->ptr = NULL; \
4211 else \
4212 { \
4213 bfd_size_type amt = (bfd_size_type) size * symhdr->count; \
4214 debug->ptr = (type) bfd_malloc (amt); \
4215 if (debug->ptr == NULL) \
4216 goto error_return; \
4217 if (bfd_seek (abfd, (file_ptr) symhdr->offset, SEEK_SET) != 0 \
4218 || bfd_bread (debug->ptr, amt, abfd) != amt) \
4219 goto error_return; \
4220 }
4234 #undef READ
4241 error_return:
4267 }
4268 \f
4269 /* MIPS ELF local labels start with '$', not 'L'. */
4271 static boolean
4275 {
4279 /* On Irix 6, the labels go back to starting with '.', so we accept
4280 the generic ELF local label syntax as well. */
4282 }
4284 /* MIPS ELF uses a special find_nearest_line routine in order the
4285 handle the ECOFF debugging information. */
4287 struct mips_elf_find_line
4288 {
4291 };
4293 boolean
4299 bfd_vma offset;
4303 {
4308 line_ptr))
4313 line_ptr,
4320 {
4321 flagword origflags;
4326 /* If we are called during a link, mips_elf_final_link may have
4327 cleared the SEC_HAS_CONTENTS field. We force it back on here
4328 if appropriate (which it normally will be). */
4335 {
4336 bfd_size_type external_fdr_size;
4344 {
4347 }
4350 {
4353 }
4355 /* Swap in the FDR information. */
4359 {
4362 }
4366 fraw_end = (fraw_src
4373 /* Note that we don't bother to ever free this information.
4374 find_nearest_line is either called all the time, as in
4375 objdump -l, so the information should be saved, or it is
4376 rarely called, as in ld error messages, so the memory
4377 wasted is unimportant. Still, it would probably be a
4378 good idea for free_cached_info to throw it away. */
4379 }
4383 line_ptr))
4384 {
4387 }
4390 }
4392 /* Fall back on the generic ELF find_nearest_line routine. */
4396 line_ptr);
4397 }
4398 \f
4399 /* The mips16 compiler uses a couple of special sections to handle
4400 floating point arguments.
4402 Section names that look like .mips16.fn.FNNAME contain stubs that
4403 copy floating point arguments from the fp regs to the gp regs and
4404 then jump to FNNAME. If any 32 bit function calls FNNAME, the
4405 call should be redirected to the stub instead. If no 32 bit
4406 function calls FNNAME, the stub should be discarded. We need to
4407 consider any reference to the function, not just a call, because
4408 if the address of the function is taken we will need the stub,
4409 since the address might be passed to a 32 bit function.
4411 Section names that look like .mips16.call.FNNAME contain stubs
4412 that copy floating point arguments from the gp regs to the fp
4413 regs and then jump to FNNAME. If FNNAME is a 32 bit function,
4414 then any 16 bit function that calls FNNAME should be redirected
4415 to the stub instead. If FNNAME is not a 32 bit function, the
4416 stub should be discarded.
4418 .mips16.call.fp.FNNAME sections are similar, but contain stubs
4419 which call FNNAME and then copy the return value from the fp regs
4420 to the gp regs. These stubs store the return value in $18 while
4421 calling FNNAME; any function which might call one of these stubs
4422 must arrange to save $18 around the call. (This case is not
4423 needed for 32 bit functions that call 16 bit functions, because
4424 16 bit functions always return floating point values in both
4425 $f0/$f1 and $2/$3.)
4427 Note that in all cases FNNAME might be defined statically.
4428 Therefore, FNNAME is not used literally. Instead, the relocation
4429 information will indicate which symbol the section is for.
4431 We record any stubs that we find in the symbol table. */
4437 /* MIPS ELF linker hash table. */
4439 struct mips_elf_link_hash_table
4440 {
4442 #if 0
4443 /* We no longer use this. */
4444 /* String section indices for the dynamic section symbols. */
4446 #endif
4447 /* The number of .rtproc entries. */
4448 bfd_size_type procedure_count;
4449 /* The size of the .compact_rel section (if SGI_COMPAT). */
4450 bfd_size_type compact_rel_size;
4451 /* This flag indicates that the value of DT_MIPS_RLD_MAP dynamic
4452 entry is set to the address of __rld_obj_head as in Irix 5. */
4453 boolean use_rld_obj_head;
4454 /* This is the value of the __rld_map or __rld_obj_head symbol. */
4455 bfd_vma rld_value;
4456 /* This is set if we see any mips16 stub sections. */
4457 boolean mips16_stubs_seen;
4458 };
4460 /* Look up an entry in a MIPS ELF linker hash table. */
4462 #define mips_elf_link_hash_lookup(table, string, create, copy, follow) \
4463 ((struct mips_elf_link_hash_entry *) \
4464 elf_link_hash_lookup (&(table)->root, (string), (create), \
4465 (copy), (follow)))
4467 /* Traverse a MIPS ELF linker hash table. */
4469 #define mips_elf_link_hash_traverse(table, func, info) \
4470 (elf_link_hash_traverse \
4471 (&(table)->root, \
4472 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
4473 (info)))
4475 /* Get the MIPS ELF linker hash table from a link_info structure. */
4477 #define mips_elf_hash_table(p) \
4478 ((struct mips_elf_link_hash_table *) ((p)->hash))
4480 static boolean mips_elf_output_extsym
4483 /* Create an entry in a MIPS ELF linker hash table. */
4490 {
4494 /* Allocate the structure if it has not already been allocated by a
4495 subclass. */
4503 /* Call the allocation method of the superclass. */
4508 {
4509 /* Set local fields. */
4511 /* We use -2 as a marker to indicate that the information has
4512 not been set. -1 means there is no associated ifd. */
4522 }
4525 }
4527 static void
4531 {
4546 /* FIXME: Do we allocate too much GOT space here? */
4549 }
4551 /* Create a MIPS ELF linker hash table. */
4556 {
4565 mips_elf_link_hash_newfunc))
4566 {
4569 }
4571 #if 0
4572 /* We no longer use this. */
4575 #endif
4583 }
4585 /* Hook called by the linker routine which adds symbols from an object
4586 file. We must handle the special MIPS section numbers here. */
4588 boolean
4597 {
4601 {
4602 /* Skip Irix 5 rld entry name. */
4605 }
4608 {
4610 /* Common symbols less than the GP size are automatically
4611 treated as SHN_MIPS_SCOMMON symbols. */
4615 /* Fall through. */
4623 /* This section is used in a shared object. */
4625 {
4639 /* Initialize the section. */
4654 }
4655 /* This code used to do *secp = bfd_und_section_ptr if
4656 info->shared. I don't know why, and that doesn't make sense,
4657 so I took it out. */
4662 /* Fall through. XXX Can we treat this as allocated data? */
4664 /* This section is used in a shared object. */
4666 {
4680 /* Initialize the section. */
4695 }
4696 /* This code used to do *secp = bfd_und_section_ptr if
4697 info->shared. I don't know why, and that doesn't make sense,
4698 so I took it out. */
4705 }
4711 {
4714 /* Mark __rld_obj_head as dynamic. */
4730 }
4732 /* If this is a mips16 text symbol, add 1 to the value to make it
4733 odd. This will cause something like .word SYM to come up with
4734 the right value when it is loaded into the PC. */
4739 }
4741 /* Structure used to pass information to mips_elf_output_extsym. */
4743 struct extsym_info
4744 {
4749 boolean failed;
4750 };
4752 /* This routine is used to write out ECOFF debugging external symbol
4753 information. It is called via mips_elf_link_hash_traverse. The
4754 ECOFF external symbol information must match the ELF external
4755 symbol information. Unfortunately, at this point we don't know
4756 whether a symbol is required by reloc information, so the two
4757 tables may wind up being different. We must sort out the external
4758 symbol information before we can set the final size of the .mdebug
4759 section, and we must set the size of the .mdebug section before we
4760 can relocate any sections, and we can't know which symbols are
4761 required by relocation until we relocate the sections.
4762 Fortunately, it is relatively unlikely that any symbol will be
4763 stripped but required by a reloc. In particular, it can not happen
4764 when generating a final executable. */
4766 static boolean
4769 PTR data;
4770 {
4772 boolean strip;
4788 else
4795 {
4806 {
4809 /* Use undefined class. Also, set class and type for some
4810 special symbols. */
4814 {
4818 }
4820 {
4825 }
4827 {
4831 }
4832 else
4834 }
4838 else
4839 {
4845 /* When making a shared library and symbol h is the one from
4846 the another shared library, OUTPUT_SECTION may be null. */
4849 else
4850 {
4870 else
4872 }
4873 }
4877 }
4883 {
4895 else
4897 }
4899 {
4904 {
4907 }
4910 {
4911 /* Set type and value for a symbol with a function stub. */
4916 else
4917 {
4923 else
4925 }
4928 #endif
4929 }
4930 }
4935 {
4938 }
4941 }
4943 /* Create a runtime procedure table from the .mdebug section. */
4945 static boolean
4947 PTR handle;
4952 {
4957 PTR rtproc;
4962 bfd_size_type size;
4963 bfd_size_type count;
4966 PDR pdr;
4967 SYMR sym;
4981 {
5019 {
5033 }
5034 }
5040 {
5043 }
5049 erp++;
5054 {
5058 }
5061 /* Set the size and contents of .rtproc section. */
5065 /* Skip this section later on (I don't think this currently
5066 matters, but someday it might). */
5082 error_return:
5094 }
5096 /* A comparison routine used to sort .gptab entries. */
5098 static int
5102 {
5107 }
5109 /* We need to use a special link routine to handle the .reginfo and
5110 the .mdebug sections. We need to merge all instances of these
5111 sections together, not write them all out sequentially. */
5113 boolean
5117 {
5123 Elf32_RegInfo reginfo;
5130 EXTR esym;
5132 bfd_size_type amt;
5135 {
5138 };
5140 {
5143 };
5145 /* If all the things we linked together were PIC, but we're
5146 producing an executable (rather than a shared object), then the
5147 resulting file is CPIC (i.e., it calls PIC code.) */
5151 {
5154 }
5156 /* We'd carefully arranged the dynamic symbol indices, and then the
5157 generic size_dynamic_sections renumbered them out from under us.
5158 Rather than trying somehow to prevent the renumbering, just do
5159 the sort again. */
5161 {
5166 /* When we resort, we must tell mips_elf_sort_hash_table what
5167 the lowest index it may use is. That's the number of section
5168 symbols we're going to add. The generic ELF linker only
5169 adds these symbols when building a shared object. Note that
5170 we count the sections after (possibly) removing the .options
5171 section above. */
5177 /* Make sure we didn't grow the global .got region. */
5186 }
5188 /* On IRIX5, we omit the .options section. On IRIX6, however, we
5189 include it, even though we don't process it quite right. (Some
5190 entries are supposed to be merged.) Empirically, we seem to be
5191 better off including it then not. */
5194 {
5196 {
5205 }
5206 }
5208 /* Get a value for the GP register. */
5210 {
5220 {
5221 bfd_vma lo;
5223 /* Find the GP-relative section with the lowest offset. */
5230 /* And calculate GP relative to that. */
5232 }
5233 else
5234 {
5235 /* If the relocate_section function needs to do a reloc
5236 involving the GP value, it should make a reloc_dangerous
5237 callback to warn that GP is not defined. */
5238 }
5239 }
5241 /* Go through the sections and collect the .reginfo and .mdebug
5242 information. */
5248 {
5250 {
5253 /* We have found the .reginfo section in the output file.
5254 Look through all the link_orders comprising it and merge
5255 the information together. */
5259 {
5262 Elf32_External_RegInfo ext;
5263 Elf32_RegInfo sub;
5266 {
5270 }
5275 /* The linker emulation code has probably clobbered the
5276 size to be zero bytes. */
5294 /* ri_gp_value is set by the function
5295 mips_elf32_section_processing when the section is
5296 finally written out. */
5298 /* Hack: reset the SEC_HAS_CONTENTS flag so that
5299 elf_link_input_bfd ignores this section. */
5301 }
5303 /* Size has been set in mips_elf_always_size_sections */
5306 /* Skip this section later on (I don't think this currently
5307 matters, but someday it might). */
5311 }
5314 {
5316 bfd_vma last;
5318 /* We have found the .mdebug section in the output file.
5319 Look through all the link_orders comprising it and merge
5320 the information together. */
5322 /* FIXME: What should the version stamp be? */
5337 /* We accumulate the debugging information itself in the
5338 debug_info structure. */
5366 {
5370 {
5373 }
5374 else
5379 }
5384 {
5393 {
5397 }
5405 {
5406 /* I don't know what a non MIPS ELF bfd would be
5407 doing with a .mdebug section, but I don't really
5408 want to deal with it. */
5410 }
5417 /* The ECOFF linking code expects that we have already
5418 read in the debugging information and set up an
5419 ecoff_debug_info structure, so we do that now. */
5429 /* Loop through the external symbols. For each one with
5430 interesting information, try to find the symbol in
5431 the linker global hash table and save the information
5432 for the output external symbols. */
5434 eraw_end = (eraw_src
5440 {
5441 EXTR ext;
5458 {
5462 }
5465 }
5467 /* Free up the information we just read. */
5480 /* Hack: reset the SEC_HAS_CONTENTS flag so that
5481 elf_link_input_bfd ignores this section. */
5483 }
5486 {
5487 /* Create .rtproc section. */
5490 {
5499 }
5504 }
5506 /* Build the external symbol information. */
5513 mips_elf_output_extsym,
5518 /* Set the size of the .mdebug section. */
5521 /* Skip this section later on (I don't think this currently
5522 matters, but someday it might). */
5526 }
5529 {
5536 /* The .gptab.sdata and .gptab.sbss sections hold
5537 information describing how the small data area would
5538 change depending upon the -G switch. These sections
5539 not used in executables files. */
5541 {
5545 {
5549 {
5553 }
5557 /* Hack: reset the SEC_HAS_CONTENTS flag so that
5558 elf_link_input_bfd ignores this section. */
5560 }
5562 /* Skip this section later on (I don't think this
5563 currently matters, but someday it might). */
5566 /* Really remove the section. */
5570 ;
5575 }
5577 /* There is one gptab for initialized data, and one for
5578 uninitialized data. */
5583 else
5584 {
5590 }
5592 /* The linker script always combines .gptab.data and
5593 .gptab.sdata into .gptab.sdata, and likewise for
5594 .gptab.bss and .gptab.sbss. It is possible that there is
5595 no .sdata or .sbss section in the output file, in which
5596 case we must change the name of the output section. */
5599 {
5602 else
5606 }
5608 /* Set up the first entry. */
5617 /* Combine the input sections. */
5621 {
5624 bfd_size_type size;
5626 bfd_size_type gpentry;
5629 {
5633 }
5638 /* Combine the gptab entries for this input section one
5639 by one. We know that the input gptab entries are
5640 sorted by ascending -G value. */
5646 {
5647 Elf32_External_gptab ext_gptab;
5648 Elf32_gptab int_gptab;
5651 boolean exact;
5658 {
5661 }
5670 {
5676 }
5679 {
5683 /* We need a new table entry. */
5687 {
5690 }
5695 /* Merge in the size for the next smallest -G
5696 value, since that will be implied by this new
5697 value. */
5700 {
5706 }
5712 }
5715 }
5717 /* Hack: reset the SEC_HAS_CONTENTS flag so that
5718 elf_link_input_bfd ignores this section. */
5720 }
5722 /* The table must be sorted by -G value. */
5726 /* Swap out the table. */
5730 {
5733 }
5742 /* Skip this section later on (I don't think this currently
5743 matters, but someday it might). */
5745 }
5746 }
5748 /* Invoke the regular ELF backend linker to do all the work. */
5750 {
5751 #ifdef BFD64
5754 #else
5758 }
5762 /* Now write out the computed sections. */
5765 {
5766 Elf32_External_RegInfo ext;
5772 }
5775 {
5783 }
5786 {
5792 }
5795 {
5801 }
5804 {
5807 {
5813 }
5814 }
5817 }
5819 /* This function is called via qsort() to sort the dynamic relocation
5820 entries by increasing r_symndx value. */
5822 static int
5826 {
5830 Elf_Internal_Rel int_reloc1;
5831 Elf_Internal_Rel int_reloc2;
5837 }
5839 /* Returns the GOT section for ABFD. */
5844 {
5846 }
5848 /* Returns the GOT information associated with the link indicated by
5849 INFO. If SGOTP is non-NULL, it is filled in with the GOT
5850 section. */
5856 {
5869 }
5871 /* Return whether a relocation is against a local symbol. */
5873 static boolean
5875 check_forced)
5879 boolean check_forced;
5880 {
5896 {
5897 /* Look up the hash table to check whether the symbol
5898 was forced local. */
5901 /* Find the real hash-table entry for this symbol. */
5907 }
5910 }
5912 /* Sign-extend VALUE, which has the indicated number of BITS. */
5914 static bfd_vma
5916 bfd_vma value;
5918 {
5920 /* VALUE is negative. */
5924 }
5926 /* Return non-zero if the indicated VALUE has overflowed the maximum
5927 range expressable by a signed number with the indicated number of
5928 BITS. */
5930 static boolean
5932 bfd_vma value;
5934 {
5938 /* The value is too big. */
5941 /* The value is too small. */
5944 /* All is well. */
5946 }
5948 /* Calculate the %high function. */
5950 static bfd_vma
5952 bfd_vma value;
5953 {
5955 }
5957 /* Calculate the %higher function. */
5959 static bfd_vma
5961 bfd_vma value ATTRIBUTE_UNUSED;
5962 {
5963 #ifdef BFD64
5965 #else
5968 #endif
5969 }
5971 /* Calculate the %highest function. */
5973 static bfd_vma
5975 bfd_vma value ATTRIBUTE_UNUSED;
5976 {
5977 #ifdef BFD64
5979 #else
5982 #endif
5983 }
5985 /* Returns the GOT index for the global symbol indicated by H. */
5987 static bfd_vma
5991 {
5992 bfd_vma index;
5998 /* Once we determine the global GOT entry with the lowest dynamic
5999 symbol table index, we must put all dynamic symbols with greater
6000 indices into the GOT. That makes it easy to calculate the GOT
6001 offset. */
6008 }
6010 /* Returns the offset for the entry at the INDEXth position
6011 in the GOT. */
6013 static bfd_vma
6017 bfd_vma index;
6018 {
6020 bfd_vma gp;
6025 gp);
6026 }
6028 /* If H is a symbol that needs a global GOT entry, but has a dynamic
6029 symbol table index lower than any we've seen to date, record it for
6030 posterity. */
6032 static boolean
6037 {
6038 /* A global symbol in the GOT must also be in the dynamic symbol
6039 table. */
6044 /* If we've already marked this entry as needing GOT space, we don't
6045 need to do it again. */
6049 /* By setting this to a value other than -1, we are indicating that
6050 there needs to be a GOT entry for H. Avoid using zero, as the
6051 generic ELF copy_indirect_symbol tests for <= 0. */
6055 }
6057 /* This structure is passed to mips_elf_sort_hash_table_f when sorting
6058 the dynamic symbols. */
6060 struct mips_elf_hash_sort_data
6061 {
6062 /* The symbol in the global GOT with the lowest dynamic symbol table
6063 index. */
6065 /* The least dynamic symbol table index corresponding to a symbol
6066 with a GOT entry. */
6068 /* The greatest dynamic symbol table index not corresponding to a
6069 symbol without a GOT entry. */
6071 };
6073 /* If H needs a GOT entry, assign it the highest available dynamic
6074 index. Otherwise, assign it the lowest available dynamic
6075 index. */
6077 static boolean
6080 PTR data;
6081 {
6085 /* Symbols without dynamic symbol table entries aren't interesting
6086 at all. */
6092 else
6093 {
6096 }
6099 }
6101 /* Sort the dynamic symbol table so that symbols that need GOT entries
6102 appear towards the end. This reduces the amount of GOT space
6103 required. MAX_LOCAL is used to set the number of local symbols
6104 known to be in the dynamic symbol table. During
6105 mips_elf_size_dynamic_sections, this value is 1. Afterward, the
6106 section symbols are added and the count is higher. */
6108 static boolean
6112 {
6124 mips_elf_sort_hash_table_f,
6127 /* There should have been enough room in the symbol table to
6128 accomodate both the GOT and non-GOT symbols. */
6131 /* Now we know which dynamic symbol has the lowest dynamic symbol
6132 table index in the GOT. */
6137 }
6139 /* Create a local GOT entry for VALUE. Return the index of the entry,
6140 or -1 if it could not be created. */
6142 static bfd_vma
6147 bfd_vma value;
6148 {
6150 {
6151 /* We didn't allocate enough space in the GOT. */
6156 }
6162 }
6164 /* Returns the GOT offset at which the indicated address can be found.
6165 If there is not yet a GOT entry for this value, create one. Returns
6166 -1 if no satisfactory GOT offset can be found. */
6168 static bfd_vma
6172 bfd_vma value;
6173 {
6180 /* Look to see if we already have an appropriate entry. */
6185 {
6189 }
6192 }
6194 /* Find a GOT entry that is within 32KB of the VALUE. These entries
6195 are supposed to be placed at small offsets in the GOT, i.e.,
6196 within 32KB of GP. Return the index into the GOT for this page,
6197 and store the offset from this entry to the desired address in
6198 OFFSETP, if it is non-NULL. */
6200 static bfd_vma
6204 bfd_vma value;
6206 {
6212 bfd_vma address;
6216 /* Look to see if we aleady have an appropriate entry. */
6222 {
6226 {
6227 /* This entry will serve as the page pointer. We can add a
6228 16-bit number to it to get the actual address. */
6231 }
6232 }
6234 /* If we didn't have an appropriate entry, we create one now. */
6239 {
6242 }
6245 }
6247 /* Find a GOT entry whose higher-order 16 bits are the same as those
6248 for value. Return the index into the GOT for this entry. */
6250 static bfd_vma
6254 bfd_vma value;
6255 boolean external;
6256 {
6262 bfd_vma address;
6265 {
6266 /* Although the ABI says that it is "the high-order 16 bits" that we
6267 want, it is really the %high value. The complete value is
6268 calculated with a `addiu' of a LO16 relocation, just as with a
6269 HI16/LO16 pair. */
6271 }
6275 /* Look to see if we already have an appropriate entry. */
6281 {
6284 {
6285 /* This entry has the right high-order 16 bits, and the low-order
6286 16 bits are set to zero. */
6289 }
6290 }
6292 /* If we didn't have an appropriate entry, we create one now. */
6297 }
6299 /* Returns the first relocation of type r_type found, beginning with
6300 RELOCATION. RELEND is one-past-the-end of the relocation table. */
6307 {
6308 /* According to the MIPS ELF ABI, the R_MIPS_LO16 relocation must be
6309 immediately following. However, for the IRIX6 ABI, the next
6310 relocation may be a composed relocation consisting of several
6311 relocations for the same address. In that case, the R_MIPS_LO16
6312 relocation may occur as one of these. We permit a similar
6313 extension in general, as that is useful for GCC. */
6315 {
6320 }
6322 /* We didn't find it. */
6325 }
6327 /* Create a rel.dyn relocation for the dynamic linker to resolve. REL
6328 is the original relocation, which is now being transformed into a
6329 dynamic relocation. The ADDENDP is adjusted if necessary; the
6330 caller should store the result in place of the original addend. */
6332 static boolean
6340 bfd_vma symbol;
6343 {
6344 Elf_Internal_Rel outrel;
6345 boolean skip;
6352 sreloc
6366 /* If we've decided to skip this relocation, just output an empty
6367 record. Note that R_MIPS_NONE == 0, so that this call to memset
6368 is a way of setting R_TYPE to R_MIPS_NONE. */
6371 else
6372 {
6374 bfd_vma section_offset;
6376 /* We must now calculate the dynamic symbol table index to use
6377 in the relocation. */
6381 {
6383 /* h->root.dynindx may be -1 if this symbol was marked to
6384 become local. */
6387 }
6388 else
6389 {
6393 {
6396 }
6397 else
6398 {
6402 }
6404 /* Figure out how far the target of the relocation is from
6405 the beginning of its section. */
6407 /* The relocation we're building is section-relative.
6408 Therefore, the original addend must be adjusted by the
6409 section offset. */
6411 /* Now, the relocation is just against the section. */
6413 }
6415 /* If the relocation was previously an absolute relocation and
6416 this symbol will not be referred to by the relocation, we must
6417 adjust it by the value we give it in the dynamic symbol table.
6418 Otherwise leave the job up to the dynamic linker. */
6422 /* The relocation is always an REL32 relocation because we don't
6423 know where the shared library will wind up at load-time. */
6426 /* Adjust the output offset of the relocation to reference the
6427 correct location in the output file. */
6430 }
6432 /* Put the relocation back out. We have to use the special
6433 relocation outputter in the 64-bit case since the 64-bit
6434 relocation format is non-standard. */
6436 {
6441 }
6442 else
6448 /* Record the index of the first relocation referencing H. This
6449 information is later emitted in the .msym section. */
6455 /* We've now added another relocation. */
6458 /* Make sure the output section is writable. The dynamic linker
6459 will be writing to it. */
6463 /* On IRIX5, make an entry of compact relocation info. */
6465 {
6470 {
6471 Elf32_crinfo cptrel;
6479 else
6490 }
6491 }
6494 }
6496 /* Calculate the value produced by the RELOCATION (which comes from
6497 the INPUT_BFD). The ADDEND is the addend to use for this
6498 RELOCATION; RELOCATION->R_ADDEND is ignored.
6500 The result of the relocation calculation is stored in VALUEP.
6501 REQUIRE_JALXP indicates whether or not the opcode used with this
6502 relocation must be JALX.
6504 This function returns bfd_reloc_continue if the caller need take no
6505 further action regarding this relocation, bfd_reloc_notsupported if
6506 something goes dramatically wrong, bfd_reloc_overflow if an
6507 overflow occurs, and bfd_reloc_ok to indicate success. */
6509 static bfd_reloc_status_type
6511 input_bfd,
6512 input_section,
6513 info,
6514 relocation,
6515 addend,
6516 howto,
6517 local_syms,
6518 local_sections,
6519 valuep,
6520 namep,
6521 require_jalxp)
6527 bfd_vma addend;
6534 {
6535 /* The eventual value we will return. */
6536 bfd_vma value;
6537 /* The address of the symbol against which the relocation is
6538 occurring. */
6540 /* The final GP value to be used for the relocatable, executable, or
6541 shared object file being produced. */
6543 /* The place (section offset or address) of the storage unit being
6544 relocated. */
6545 bfd_vma p;
6546 /* The value of GP used to create the relocatable object. */
6548 /* The offset into the global offset table at which the address of
6549 the relocation entry symbol, adjusted by the addend, resides
6550 during execution. */
6552 /* The section in which the symbol referenced by the relocation is
6553 located. */
6556 /* True if the symbol referred to by this relocation is a local
6557 symbol. */
6558 boolean local_p;
6559 /* True if the symbol referred to by this relocation is "_gp_disp". */
6565 /* True if overflow occurred during the calculation of the
6566 relocation value. */
6567 boolean overflowed_p;
6568 /* True if this relocation refers to a MIPS16 function. */
6571 /* Parse the relocation. */
6578 /* Assume that there will be no overflow. */
6581 /* Figure out whether or not the symbol is local, and get the offset
6582 used in the array of hash table entries. */
6588 else
6589 {
6590 /* The symbol table does not follow the rule that local symbols
6591 must come before globals. */
6593 }
6595 /* Figure out the value of the symbol. */
6597 {
6607 /* MIPS16 text labels should be treated as odd. */
6611 /* Record the name of this symbol, for our caller. */
6619 }
6620 else
6621 {
6622 /* For global symbols we look up the symbol in the hash-table. */
6625 /* Find the real hash-table entry for this symbol. */
6630 /* Record the name of this symbol, for our caller. */
6633 /* See if this is the special _gp_disp symbol. Note that such a
6634 symbol must always be a global symbol. */
6636 {
6637 /* Relocations against _gp_disp are permitted only with
6638 R_MIPS_HI16 and R_MIPS_LO16 relocations. */
6643 }
6644 /* If this symbol is defined, calculate its address. Note that
6645 _gp_disp is a magic symbol, always implicitly defined by the
6646 linker, so it's inappropriate to check to see whether or not
6647 its defined. */
6651 {
6657 else
6659 }
6661 /* We allow relocations against undefined weak symbols, giving
6662 it the value zero, so that you can undefined weak functions
6663 and check to see if they exist by looking at their
6664 addresses. */
6673 {
6674 /* If this is a dynamic link, we should have created a
6675 _DYNAMIC_LINK symbol or _DYNAMIC_LINKING(for normal mips) symbol
6676 in in mips_elf_create_dynamic_sections.
6677 Otherwise, we should define the symbol with a value of 0.
6678 FIXME: It should probably get into the symbol table
6679 somehow as well. */
6683 }
6684 else
6685 {
6693 }
6696 }
6698 /* If this is a 32-bit call to a 16-bit function with a stub, we
6699 need to redirect the call to the stub, unless we're already *in*
6700 a stub. */
6706 {
6707 /* This is a 32-bit call to a 16-bit function. We should
6708 have already noticed that we were going to need the
6709 stub. */
6712 else
6713 {
6716 }
6719 }
6720 /* If this is a 16-bit call to a 32-bit function with a stub, we
6721 need to redirect the call to the stub. */
6726 {
6727 /* If both call_stub and call_fp_stub are defined, we can figure
6728 out which one to use by seeing which one appears in the input
6729 file. */
6731 {
6736 {
6739 {
6742 }
6743 }
6746 }
6749 else
6754 }
6756 /* Calls from 16-bit code to 32-bit code and vice versa require the
6757 special jalx instruction. */
6764 /* If we haven't already determined the GOT offset, or the GP value,
6765 and we're going to need it, get it now. */
6767 {
6775 /* Find the index into the GOT where this value is located. */
6777 {
6779 g = mips_elf_global_got_index
6786 {
6787 /* This is a static link or a -Bsymbolic link. The
6788 symbol is defined locally, or was forced to be local.
6789 We must initialize this entry in the GOT. */
6794 }
6795 }
6797 /* There's no need to create a local GOT entry here; the
6798 calculation for a local GOT16 entry does not involve G. */
6800 else
6801 {
6805 }
6807 /* Convert GOT indices to actual offsets. */
6823 }
6825 /* Figure out what kind of relocation is being performed. */
6827 {
6848 {
6849 /* If we're creating a shared library, or this relocation is
6850 against a symbol in a shared library, then we can't know
6851 where the symbol will end up. So, we create a relocation
6852 record in the output, and leave the job up to the dynamic
6853 linker. */
6856 info,
6857 relocation,
6858 h,
6859 sec,
6860 symbol,
6862 input_section))
6864 }
6865 else
6866 {
6869 else
6871 }
6894 /* The calculation for R_MIPS16_26 is just the same as for an
6895 R_MIPS_26. It's only the storage of the relocated field into
6896 the output file that's different. That's handled in
6897 mips_elf_perform_relocation. So, we just fall through to the
6898 R_MIPS_26 case here. */
6902 else
6909 {
6912 }
6913 else
6914 {
6917 }
6923 else
6924 {
6926 /* The MIPS ABI requires checking the R_MIPS_LO16 relocation
6927 for overflow. But, on, say, Irix 5, relocations against
6928 _gp_disp are normally generated from the .cpload
6929 pseudo-op. It generates code that normally looks like
6930 this:
6932 lui $gp,%hi(_gp_disp)
6933 addiu $gp,$gp,%lo(_gp_disp)
6934 addu $gp,$gp,$t9
6936 Here $t9 holds the address of the function being called,
6937 as required by the MIPS ELF ABI. The R_MIPS_LO16
6938 relocation can easily overflow in this situation, but the
6939 R_MIPS_HI16 relocation will handle the overflow.
6940 Therefore, we consider this a bug in the MIPS ABI, and do
6941 not check for overflow here. */
6942 }
6946 /* Because we don't merge literal sections, we can handle this
6947 just like R_MIPS_GPREL16. In the long run, we should merge
6948 shared literals, and then we will need to additional work
6949 here. */
6951 /* Fall through. */
6954 /* The R_MIPS16_GPREL performs the same calculation as
6955 R_MIPS_GPREL16, but stores the relocated bits in a different
6956 order. We don't need to do anything special here; the
6957 differences are handled in mips_elf_perform_relocation. */
6961 else
6969 {
6970 boolean forced;
6972 /* The special case is when the symbol is forced to be local. We
6973 need the full address in the GOT since no R_MIPS_LO16 relocation
6974 follows. */
6980 value
6982 abfd,
6983 value);
6986 }
6988 /* Fall through. */
7007 /* We're allowed to handle these two relocations identically.
7008 The dynamic linker is allowed to handle the CALL relocations
7009 differently by creating a lazy evaluation stub. */
7025 abfd,
7026 value);
7057 /* Both of these may be ignored. R_MIPS_JALR is an optimization
7058 hint; we could improve performance by honoring that hint. */
7063 /* We don't do anything with these at present. */
7067 /* An unrecognized relocation type. */
7069 }
7071 /* Store the VALUE for our caller. */
7074 }
7076 /* Obtain the field relocated by RELOCATION. */
7078 static bfd_vma
7084 {
7085 bfd_vma x;
7088 /* Obtain the bytes. */
7094 /* The two 16-bit words will be reversed on a little-endian
7095 system. See mips_elf_perform_relocation for more details. */
7099 }
7101 /* It has been determined that the result of the RELOCATION is the
7102 VALUE. Use HOWTO to place VALUE into the output file at the
7103 appropriate position. The SECTION is the section to which the
7104 relocation applies. If REQUIRE_JALX is true, then the opcode used
7105 for the relocation must be either JAL or JALX, and it is
7106 unconditionally converted to JALX.
7108 Returns false if anything goes wrong. */
7110 static boolean
7117 bfd_vma value;
7121 boolean require_jalx;
7122 {
7123 bfd_vma x;
7127 /* Figure out where the relocation is occurring. */
7130 /* Obtain the current value. */
7133 /* Clear the field we are setting. */
7136 /* If this is the R_MIPS16_26 relocation, we must store the
7137 value in a funny way. */
7139 {
7140 /* R_MIPS16_26 is used for the mips16 jal and jalx instructions.
7141 Most mips16 instructions are 16 bits, but these instructions
7142 are 32 bits.
7144 The format of these instructions is:
7146 +--------------+--------------------------------+
7147 ! JALX ! X! Imm 20:16 ! Imm 25:21 !
7148 +--------------+--------------------------------+
7149 ! Immediate 15:0 !
7150 +-----------------------------------------------+
7152 JALX is the 5-bit value 00011. X is 0 for jal, 1 for jalx.
7153 Note that the immediate value in the first word is swapped.
7155 When producing a relocateable object file, R_MIPS16_26 is
7156 handled mostly like R_MIPS_26. In particular, the addend is
7157 stored as a straight 26-bit value in a 32-bit instruction.
7158 (gas makes life simpler for itself by never adjusting a
7159 R_MIPS16_26 reloc to be against a section, so the addend is
7160 always zero). However, the 32 bit instruction is stored as 2
7161 16-bit values, rather than a single 32-bit value. In a
7162 big-endian file, the result is the same; in a little-endian
7163 file, the two 16-bit halves of the 32 bit value are swapped.
7164 This is so that a disassembler can recognize the jal
7165 instruction.
7167 When doing a final link, R_MIPS16_26 is treated as a 32 bit
7168 instruction stored as two 16-bit values. The addend A is the
7169 contents of the targ26 field. The calculation is the same as
7170 R_MIPS_26. When storing the calculated value, reorder the
7171 immediate value as shown above, and don't forget to store the
7172 value as two 16-bit values.
7174 To put it in MIPS ABI terms, the relocation field is T-targ26-16,
7175 defined as
7177 big-endian:
7178 +--------+----------------------+
7179 | | |
7180 | | targ26-16 |
7181 |31 26|25 0|
7182 +--------+----------------------+
7184 little-endian:
7185 +----------+------+-------------+
7186 | | | |
7187 | sub1 | | sub2 |
7188 |0 9|10 15|16 31|
7189 +----------+--------------------+
7190 where targ26-16 is sub1 followed by sub2 (i.e., the addend field A is
7191 ((sub1 << 16) | sub2)).
7193 When producing a relocateable object file, the calculation is
7194 (((A < 2) | ((P + 4) & 0xf0000000) + S) >> 2)
7195 When producing a fully linked file, the calculation is
7196 let R = (((A < 2) | ((P + 4) & 0xf0000000) + S) >> 2)
7197 ((R & 0x1f0000) << 5) | ((R & 0x3e00000) >> 5) | (R & 0xffff) */
7200 /* Shuffle the bits according to the formula above. */
7204 }
7206 {
7207 /* R_MIPS16_GPREL is used for GP-relative addressing in mips16
7208 mode. A typical instruction will have a format like this:
7210 +--------------+--------------------------------+
7211 ! EXTEND ! Imm 10:5 ! Imm 15:11 !
7212 +--------------+--------------------------------+
7213 ! Major ! rx ! ry ! Imm 4:0 !
7214 +--------------+--------------------------------+
7216 EXTEND is the five bit value 11110. Major is the instruction
7217 opcode.
7219 This is handled exactly like R_MIPS_GPREL16, except that the
7220 addend is retrieved and stored as shown in this diagram; that
7221 is, the Imm fields above replace the V-rel16 field.
7223 All we need to do here is shuffle the bits appropriately. As
7224 above, the two 16-bit halves must be swapped on a
7225 little-endian system. */
7229 }
7231 /* Set the field. */
7234 /* If required, turn JAL into JALX. */
7236 {
7237 boolean ok;
7239 bfd_vma jalx_opcode;
7241 /* Check to see if the opcode is already JAL or JALX. */
7243 {
7246 }
7247 else
7248 {
7251 }
7253 /* If the opcode is not JAL or JALX, there's a problem. */
7255 {
7263 }
7265 /* Make this the JALX opcode. */
7267 }
7269 /* Swap the high- and low-order 16 bits on little-endian systems
7270 when doing a MIPS16 relocation. */
7275 /* Put the value into the output. */
7278 }
7280 /* Returns true if SECTION is a MIPS16 stub section. */
7282 static boolean
7286 {
7292 }
7294 /* Relocate a MIPS ELF section. */
7296 boolean
7307 {
7317 {
7319 bfd_vma value;
7321 boolean require_jalx;
7322 /* True if the relocation is a RELA relocation, rather than a
7323 REL relocation. */
7328 /* Find the relocation howto for this relocation. */
7330 {
7331 /* Some 32-bit code uses R_MIPS_64. In particular, people use
7332 64-bit code, but make sure all their addresses are in the
7333 lowermost or uppermost 32-bit section of the 64-bit address
7334 space. Thus, when they use an R_MIPS_64 they mean what is
7335 usually meant by R_MIPS_32, with the exception that the
7336 stored value is sign-extended to 64 bits. */
7339 /* On big-endian systems, we need to lie about the position
7340 of the reloc. */
7343 }
7344 else
7348 {
7351 /* If these relocations were originally of the REL variety,
7352 we must pull the addend out of the field that will be
7353 relocated. Otherwise, we simply use the contents of the
7354 RELA relocation. To determine which flavor or relocation
7355 this is, we depend on the fact that the INPUT_SECTION's
7356 REL_HDR is read before its REL_HDR2. */
7362 {
7363 /* Note that this is a REL relocation. */
7366 /* Get the addend, which is stored in the input file. */
7368 rel,
7369 input_bfd,
7370 contents);
7373 /* For some kinds of relocations, the ADDEND is a
7374 combination of the addend stored in two different
7375 relocations. */
7381 {
7382 bfd_vma l;
7387 /* The combined value is the sum of the HI16 addend,
7388 left-shifted by sixteen bits, and the LO16
7389 addend, sign extended. (Usually, the code does
7390 a `lui' of the HI16 value, and then an `addiu' of
7391 the LO16 value.)
7393 Scan ahead to find a matching LO16 relocation. */
7396 else
7398 lo16_relocation
7403 /* Obtain the addend kept there. */
7406 lo16_relocation,
7413 /* Compute the combined addend. */
7415 }
7417 {
7418 /* The addend is scrambled in the object file. See
7419 mips_elf_perform_relocation for details on the
7420 format. */
7424 }
7425 }
7426 else
7428 }
7431 {
7439 /* Since we're just relocating, all we need to do is copy
7440 the relocations back out to the object file, unless
7441 they're against a section symbol, in which case we need
7442 to adjust by the section offset, or unless they're GP
7443 relative in which case we need to adjust by the amount
7444 that we're adjusting GP in this relocateable object. */
7448 /* There's nothing to do for non-local relocations. */
7459 /* The addend is stored without its two least
7460 significant bits (which are always zero.) In a
7461 non-relocateable link, calculate_relocation will do
7462 this shift; here, we must do it ourselves. */
7468 /* Adjust the addend appropriately. */
7471 /* If the relocation is for a R_MIPS_HI16 or R_MIPS_GOT16,
7472 then we only want to write out the high-order 16 bits.
7473 The subsequent R_MIPS_LO16 will handle the low-order bits. */
7477 /* If the relocation is for an R_MIPS_26 relocation, then
7478 the two low-order bits are not stored in the object file;
7479 they are implicitly zero. */
7485 /* If this is a RELA relocation, just update the addend.
7486 We have to cast away constness for REL. */
7488 else
7489 {
7490 /* Otherwise, we have to write the value back out. Note
7491 that we use the source mask, rather than the
7492 destination mask because the place to which we are
7493 writing will be source of the addend in the final
7494 link. */
7498 /* See the comment above about using R_MIPS_64 in the 32-bit
7499 ABI. Here, we need to update the addend. It would be
7500 possible to get away with just using the R_MIPS_32 reloc
7501 but for endianness. */
7502 {
7503 bfd_vma sign_bits;
7504 bfd_vma low_bits;
7505 bfd_vma high_bits;
7508 #ifdef BFD64
7510 #else
7512 #endif
7513 else
7516 /* If we don't know that we have a 64-bit type,
7517 do two separate stores. */
7519 {
7520 /* Store the sign-bits (which are most significant)
7521 first. */
7524 }
7525 else
7526 {
7529 }
7535 }
7541 }
7543 /* Go on to the next relocation. */
7545 }
7547 /* In the N32 and 64-bit ABIs there may be multiple consecutive
7548 relocations for the same offset. In that case we are
7549 supposed to treat the output of each relocation as the addend
7550 for the next. */
7555 else
7558 /* Figure out what value we are supposed to relocate. */
7560 input_bfd,
7561 input_section,
7562 info,
7563 rel,
7564 addend,
7565 howto,
7566 local_syms,
7567 local_sections,
7571 {
7573 /* There's nothing to do. */
7577 /* mips_elf_calculate_relocation already called the
7578 undefined_symbol callback. There's no real point in
7579 trying to perform the relocation at this point, so we
7580 just skip ahead to the next relocation. */
7591 /* Ignore overflow until we reach the last relocation for
7592 a given location. */
7593 ;
7594 else
7595 {
7601 }
7610 }
7612 /* If we've got another relocation for the address, keep going
7613 until we reach the last one. */
7615 {
7618 }
7621 /* See the comment above about using R_MIPS_64 in the 32-bit
7622 ABI. Until now, we've been using the HOWTO for R_MIPS_32;
7623 that calculated the right value. Now, however, we
7624 sign-extend the 32-bit result to 64-bits, and store it as a
7625 64-bit value. We are especially generous here in that we
7626 go to extreme lengths to support this usage on systems with
7627 only a 32-bit VMA. */
7628 {
7629 bfd_vma sign_bits;
7630 bfd_vma low_bits;
7631 bfd_vma high_bits;
7634 #ifdef BFD64
7636 #else
7638 #endif
7639 else
7642 /* If we don't know that we have a 64-bit type,
7643 do two separate stores. */
7645 {
7646 /* Undo what we did above. */
7648 /* Store the sign-bits (which are most significant)
7649 first. */
7652 }
7653 else
7654 {
7657 }
7663 }
7665 /* Actually perform the relocation. */
7668 require_jalx))
7670 }
7673 }
7675 /* This hook function is called before the linker writes out a global
7676 symbol. We mark symbols as small common if appropriate. This is
7677 also where we undo the increment of the value for a mips16 symbol. */
7679 boolean
7686 {
7687 /* If we see a common symbol, which implies a relocatable link, then
7688 if a symbol was small common in an input file, mark it as small
7689 common in the output file. */
7699 }
7700 \f
7701 /* Functions for the dynamic linker. */
7703 /* The name of the dynamic interpreter. This is put in the .interp
7704 section. */
7706 #define ELF_DYNAMIC_INTERPRETER(abfd) \
7711 /* Create dynamic sections when linking against a dynamic object. */
7713 boolean
7717 {
7719 flagword flags;
7726 /* Mips ABI requests the .dynamic section to be read only. */
7729 {
7732 }
7734 /* We need to create .got section. */
7738 /* Create the .msym section on IRIX6. It is used by the dynamic
7739 linker to speed up dynamic relocations, and to avoid computing
7740 the ELF hash for symbols. */
7745 /* Create .stub section. */
7748 {
7755 }
7760 {
7767 }
7769 /* On IRIX5, we adjust add some additional symbols and change the
7770 alignments of several sections. There is no ABI documentation
7771 indicating that this is necessary on IRIX6, nor any evidence that
7772 the linker takes such action. */
7774 {
7776 {
7790 }
7792 /* We need to create a .compact_rel section. */
7794 {
7797 }
7799 /* Change aligments of some sections. */
7815 }
7818 {
7821 {
7828 }
7829 else
7830 {
7831 /* For normal mips it is _DYNAMIC_LINKING. */
7838 }
7847 {
7848 /* __rld_map is a four byte word located in the .data section
7849 and is filled in by the rtld to contain a pointer to
7850 the _r_debug structure. Its symbol value will be set in
7851 mips_elf_finish_dynamic_symbol. */
7857 {
7864 }
7865 else
7866 {
7867 /* For normal mips the symbol is __RLD_MAP. */
7874 }
7881 }
7882 }
7885 }
7887 /* Create the .compact_rel section. */
7889 static boolean
7893 {
7894 flagword flags;
7898 {
7910 }
7913 }
7915 /* Create the .got section to hold the global offset table. */
7917 static boolean
7921 {
7922 flagword flags;
7926 bfd_size_type amt;
7928 /* This function may be called more than once. */
7941 /* Define the symbol _GLOBAL_OFFSET_TABLE_. We don't do this in the
7942 linker script because we don't want to define the symbol if we
7943 are not creating a global offset table. */
7959 /* The first several global offset table entries are reserved. */
7970 {
7975 }
7981 }
7983 /* Returns the .msym section for ABFD, creating it if it does not
7984 already exist. Returns NULL to indicate error. */
7989 {
7994 {
7998 SEC_ALLOC
7999 | SEC_LOAD
8000 | SEC_HAS_CONTENTS
8001 | SEC_LINKER_CREATED
8006 }
8009 }
8011 /* Add room for N relocations to the .rel.dyn section in ABFD. */
8013 static void
8017 {
8024 {
8025 /* Make room for a null element. */
8028 }
8030 }
8032 /* Look through the relocs for a section during the first phase, and
8033 allocate space in the global offset table. */
8035 boolean
8041 {
8062 /* Check for the mips16 stub sections. */
8066 {
8069 /* Look at the relocation information to figure out which symbol
8070 this is for. */
8076 {
8079 /* This stub is for a local symbol. This stub will only be
8080 needed if there is some relocation in this BFD, other
8081 than a 16 bit function call, which refers to this symbol. */
8083 {
8087 /* We can ignore stub sections when looking for relocs. */
8098 sec_relocs = (_bfd_elf32_link_read_relocs
8116 }
8119 {
8120 /* There is no non-call reloc for this stub, so we do
8121 not need it. Since this function is called before
8122 the linker maps input sections to output sections, we
8123 can easily discard it by setting the SEC_EXCLUDE
8124 flag. */
8127 }
8129 /* Record this stub in an array of local symbol stubs for
8130 this BFD. */
8132 {
8135 bfd_size_type amt;
8139 else
8146 }
8150 /* We don't need to set mips16_stubs_seen in this case.
8151 That flag is used to see whether we need to look through
8152 the global symbol table for stubs. We don't need to set
8153 it here, because we just have a local stub. */
8154 }
8155 else
8156 {
8162 /* H is the symbol this stub is for. */
8166 }
8167 }
8170 {
8175 /* Look at the relocation information to figure out which symbol
8176 this is for. */
8182 {
8183 /* This stub was actually built for a static symbol defined
8184 in the same file. We assume that all static symbols in
8185 mips16 code are themselves mips16, so we can simply
8186 discard this stub. Since this function is called before
8187 the linker maps input sections to output sections, we can
8188 easily discard it by setting the SEC_EXCLUDE flag. */
8191 }
8196 /* H is the symbol this stub is for. */
8200 else
8203 /* If we already have an appropriate stub for this function, we
8204 don't need another one, so we can discard this one. Since
8205 this function is called before the linker maps input sections
8206 to output sections, we can easily discard it by setting the
8207 SEC_EXCLUDE flag. We can also discard this section if we
8208 happen to already know that this is a mips16 function; it is
8209 not necessary to check this here, as it is checked later, but
8210 it is slightly faster to check now. */
8212 {
8215 }
8219 }
8222 {
8225 }
8226 else
8227 {
8231 else
8232 {
8236 }
8237 }
8243 {
8254 {
8260 }
8261 else
8262 {
8265 /* This may be an indirect symbol created because of a version. */
8267 {
8270 }
8271 }
8273 /* Some relocs require a global offset table. */
8275 {
8277 {
8305 }
8306 }
8311 {
8312 /* We may need a local GOT entry for this relocation. We
8313 don't count R_MIPS_GOT_PAGE because we can estimate the
8314 maximum number of pages needed by looking at the size of
8315 the segment. Similar comments apply to R_MIPS_GOT16 and
8316 R_MIPS_CALL16. We don't count R_MIPS_GOT_HI16, or
8317 R_MIPS_CALL_HI16 because these are always followed by an
8318 R_MIPS_GOT_LO16 or R_MIPS_CALL_LO16.
8320 This estimation is very conservative since we can merge
8321 duplicate entries in the GOT. In order to be less
8322 conservative, we could actually build the GOT here,
8323 rather than in relocate_section. */
8326 }
8329 {
8332 {
8338 }
8339 /* Fall through. */
8344 {
8345 /* This symbol requires a global offset table entry. */
8349 /* We need a stub, not a plt entry for the undefined
8350 function. But we record it as if it needs plt. See
8351 elf_adjust_dynamic_symbol in elflink.h. */
8354 }
8361 /* This symbol requires a global offset table entry. */
8371 {
8373 {
8378 {
8382 (SEC_ALLOC
8383 | SEC_LOAD
8384 | SEC_HAS_CONTENTS
8385 | SEC_IN_MEMORY
8386 | SEC_LINKER_CREATED
8391 }
8392 }
8393 #define MIPS_READONLY_SECTION (SEC_ALLOC | SEC_LOAD | SEC_READONLY)
8395 {
8396 /* When creating a shared object, we must copy these
8397 reloc types into the output file as R_MIPS_REL32
8398 relocs. We make room for this reloc in the
8399 .rel.dyn reloc section. */
8403 /* We tell the dynamic linker that there are
8404 relocations against the text segment. */
8406 }
8407 else
8408 {
8411 /* We only need to copy this reloc if the symbol is
8412 defined in a dynamic object. */
8417 /* We need it to tell the dynamic linker if there
8418 are relocations against the text segment. */
8420 }
8422 /* Even though we don't directly need a GOT entry for
8423 this symbol, a symbol must have a dynamic symbol
8424 table index greater that DT_MIPS_GOTSYM if there are
8425 dynamic relocations against it. */
8429 }
8445 /* This relocation describes the C++ object vtable hierarchy.
8446 Reconstruct it for later use during GC. */
8452 /* This relocation describes which C++ vtable entries are actually
8453 used. Record for later use during GC. */
8461 }
8463 /* We must not create a stub for a symbol that has relocations
8464 related to taking the function's address. */
8466 {
8469 {
8474 }
8480 }
8482 /* If this reloc is not a 16 bit call, and it has a global
8483 symbol, then we will need the fn_stub if there is one.
8484 References from a stub section do not count. */
8493 {
8498 }
8499 }
8502 }
8504 /* Return the section that should be marked against GC for a given
8505 relocation. */
8507 asection *
8514 {
8515 /* ??? Do mips16 stub sections need to be handled special? */
8518 {
8520 {
8527 {
8537 }
8538 }
8539 }
8540 else
8541 {
8543 }
8546 }
8548 /* Update the got entry reference counts for the section being removed. */
8550 boolean
8556 {
8557 #if 0
8572 {
8579 /* ??? It would seem that the existing MIPS code does no sort
8580 of reference counting or whatnot on its GOT and PLT entries,
8581 so it is not possible to garbage collect them at this time. */
8586 }
8587 #endif
8590 }
8592 /* Copy data from a MIPS ELF indirect symbol to its direct symbol,
8593 hiding the old indirect symbol. Process additional relocation
8594 information. Also called for weakdefs, in which case we just let
8595 _bfd_elf_link_hash_copy_indirect copy the flags for us. */
8597 static void
8600 {
8619 }
8621 /* Adjust a symbol defined by a dynamic object and referenced by a
8622 regular object. The current definition is in some section of the
8623 dynamic object, but we're not including those sections. We have to
8624 change the definition to something the rest of the link can
8625 understand. */
8627 boolean
8631 {
8638 /* Make sure we know what is going on here. */
8649 /* If this symbol is defined in a dynamic object, we need to copy
8650 any R_MIPS_32 or R_MIPS_REL32 relocs against it into the output
8651 file. */
8658 {
8662 /* We tell the dynamic linker that there are relocations
8663 against the text segment. */
8665 }
8667 /* For a function, create a stub, if allowed. */
8670 {
8674 /* If this symbol is not defined in a regular file, then set
8675 the symbol to the stub location. This is required to make
8676 function pointers compare as equal between the normal
8677 executable and the shared library. */
8679 {
8680 /* We need .stub section. */
8688 /* XXX Write this stub address somewhere. */
8691 /* Make room for this stub code. */
8694 /* The last half word of the stub will be filled with the index
8695 of this symbol in .dynsym section. */
8697 }
8698 }
8701 {
8702 /* This will set the entry for this symbol in the GOT to 0, and
8703 the dynamic linker will take care of this. */
8706 }
8708 /* If this is a weak symbol, and there is a real definition, the
8709 processor independent code will have arranged for us to see the
8710 real definition first, and we can just use the same value. */
8712 {
8718 }
8720 /* This is a reference to a symbol defined by a dynamic object which
8721 is not a function. */
8724 }
8726 /* This function is called after all the input files have been read,
8727 and the input sections have been assigned to output sections. We
8728 check for any mips16 stub sections that we can discard. */
8730 static boolean mips_elf_check_mips16_stubs
8733 boolean
8737 {
8740 /* The .reginfo section has a fixed size. */
8751 mips_elf_check_mips16_stubs,
8755 }
8757 /* Check the mips16 stubs for a particular symbol, and see if we can
8758 discard them. */
8760 static boolean
8763 PTR data ATTRIBUTE_UNUSED;
8764 {
8767 {
8768 /* We don't need the fn_stub; the only references to this symbol
8769 are 16 bit calls. Clobber the size to 0 to prevent it from
8770 being included in the link. */
8776 }
8780 {
8781 /* We don't need the call_stub; this is a 16 bit function, so
8782 calls from other 16 bit functions are OK. Clobber the size
8783 to 0 to prevent it from being included in the link. */
8789 }
8793 {
8794 /* We don't need the call_stub; this is a 16 bit function, so
8795 calls from other 16 bit functions are OK. Clobber the size
8796 to 0 to prevent it from being included in the link. */
8802 }
8805 }
8807 /* Set the sizes of the dynamic sections. */
8809 boolean
8813 {
8816 boolean reltext;
8823 {
8824 /* Set the contents of the .interp section to the interpreter. */
8826 {
8829 s->_raw_size
8831 s->contents
8833 }
8834 }
8836 /* The check_relocs and adjust_dynamic_symbol entry points have
8837 determined the sizes of the various dynamic sections. Allocate
8838 memory for them. */
8841 {
8843 boolean strip;
8845 /* It's OK to base decisions on the section name, because none
8846 of the dynobj section names depend upon the input files. */
8855 {
8857 {
8858 /* We only strip the section if the output section name
8859 has the same name. Otherwise, there might be several
8860 input sections for this output section. FIXME: This
8861 code is probably not needed these days anyhow, since
8862 the linker now does not create empty output sections. */
8868 }
8869 else
8870 {
8874 /* If this relocation section applies to a read only
8875 section, then we probably need a DT_TEXTREL entry.
8876 If the relocation section is .rel.dyn, we always
8877 assert a DT_TEXTREL entry rather than testing whether
8878 there exists a relocation to a read only section or
8879 not. */
8890 /* We use the reloc_count field as a counter if we need
8891 to copy relocs into the output file. */
8895 }
8896 }
8898 {
8901 bfd_size_type local_gotno;
8908 /* Calculate the total loadable size of the output. That
8909 will give us the maximum number of GOT_PAGE entries
8910 required. */
8912 {
8916 subsection;
8918 {
8923 }
8924 }
8927 /* Assume there are two loadable segments consisting of
8928 contiguous sections. Is 5 enough? */
8931 /* It's possible we will need GOT_PAGE entries as well as
8932 GOT16 entries. Often, these will be able to share GOT
8933 entries, but not always. */
8939 /* There has to be a global GOT entry for every symbol with
8940 a dynamic symbol table index of DT_MIPS_GOTSYM or
8941 higher. Therefore, it make sense to put those symbols
8942 that need GOT entries at the end of the symbol table. We
8943 do that here. */
8949 else
8950 /* If there are no global symbols, or none requiring
8951 relocations, then GLOBAL_GOTSYM will be NULL. */
8955 }
8957 {
8958 /* Irix rld assumes that the function stub isn't at the end
8959 of .text section. So put a dummy. XXX */
8961 }
8965 {
8966 /* We add a room for __rld_map. It will be filled in by the
8967 rtld to contain a pointer to the _r_debug structure. */
8969 }
8979 {
8980 /* It's not one of our sections, so don't allocate space. */
8982 }
8985 {
8988 }
8990 /* Allocate memory for the section contents. */
8993 {
8996 }
8997 }
9000 {
9001 /* Add some entries to the .dynamic section. We fill in the
9002 values later, in elf_mips_finish_dynamic_sections, but we
9003 must add the entries now so that we get the correct size for
9004 the .dynamic section. The DT_DEBUG entry is filled in by the
9005 dynamic linker and used by the debugger. */
9007 {
9008 /* SGI object has the equivalence of DT_DEBUG in the
9009 DT_MIPS_RLD_MAP entry. */
9013 {
9016 }
9017 }
9018 else
9019 {
9020 /* Shared libraries on traditional mips have DT_DEBUG. */
9022 {
9025 }
9026 }
9032 {
9035 }
9042 {
9051 }
9054 {
9057 }
9060 {
9063 }
9066 {
9075 }
9083 #if 0
9084 /* Time stamps in executable files are a bad idea. */
9087 #endif
9092 #endif
9097 #endif
9119 && (bfd_get_section_by_name
9128 }
9131 }
9133 /* If NAME is one of the special IRIX6 symbols defined by the linker,
9134 adjust it appropriately now. */
9136 static void
9141 {
9142 /* The linker script takes care of providing names and values for
9143 these, but we must place them into the right sections. */
9150 NULL
9151 };
9158 NULL
9159 };
9169 {
9170 /* All of these symbols are given type STT_SECTION by the
9171 IRIX6 linker. */
9174 /* The IRIX linker puts these symbols in special sections. */
9177 else
9181 }
9182 }
9184 /* Finish up dynamic symbol handling. We set the contents of various
9185 dynamic sections here. */
9187 boolean
9193 {
9195 bfd_vma gval;
9207 {
9212 /* This symbol has a stub. Set it up. */
9220 /* Fill the stub. */
9227 /* FIXME: Can h->dynindex be more than 64K? */
9238 /* Mark the symbol as undefined. plt.offset != -1 occurs
9239 only for the referenced symbol. */
9242 /* The run-time linker uses the st_value field of the symbol
9243 to reset the global offset table entry for this external
9244 to its stub address when unlinking a shared object. */
9247 }
9258 /* Run through the global symbol table, creating GOT entries for all
9259 the symbols that need them. */
9262 {
9263 bfd_vma offset;
9264 bfd_vma value;
9268 else
9269 {
9270 /* For an entity defined in a shared object, this will be
9271 NULL. (For functions in shared objects for
9272 which we have created stubs, ST_VALUE will be non-NULL.
9273 That's because such the functions are now no longer defined
9274 in a shared object.) */
9278 else
9280 }
9283 }
9285 /* Create a .msym entry, if appropriate. */
9289 {
9290 Elf32_Internal_Msym msym;
9293 /* It is undocumented what the `1' indicates, but IRIX6 uses
9294 this value. */
9296 bfd_mips_elf_swap_msym_out
9299 }
9301 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
9308 {
9312 }
9314 {
9318 }
9320 {
9323 {
9328 }
9330 {
9335 }
9337 {
9342 }
9343 }
9345 /* Handle the IRIX6-specific symbols. */
9350 {
9354 {
9361 }
9364 {
9365 /* IRIX6 does not use a .rld_map section. */
9371 }
9372 }
9374 /* If this is a mips16 symbol, force the value to be even. */
9380 }
9382 /* Finish up the dynamic sections. */
9384 boolean
9388 {
9401 else
9402 {
9406 }
9409 {
9418 {
9419 Elf_Internal_Dyn dyn;
9423 boolean swap_out_p;
9425 /* Read in the current dynamic entry. */
9428 /* Assume that we're going to modify it and write it out. */
9432 {
9434 s = (bfd_get_section_by_name
9442 /* Rewrite DT_STRSZ. */
9455 get_vma:
9477 set_elemno:
9480 {
9483 else
9485 }
9486 else
9495 /* XXX FIXME: */
9500 /* XXX FIXME: */
9515 /* The index into the dynamic symbol table which is the
9516 entry of the first external symbol that is not
9517 referenced within the same object. */
9523 {
9526 }
9527 /* In case if we don't have global got symbols we default
9528 to setting DT_MIPS_GOTSYM to the same value as
9529 DT_MIPS_SYMTABNO, so we just fall through. */
9539 else
9552 s = (bfd_get_section_by_name
9558 s = (bfd_get_section_by_name
9566 }
9571 }
9572 }
9574 /* The first entry of the global offset table will be filled at
9575 runtime. The second entry will be used by some runtime loaders.
9576 This isn't the case of Irix rld. */
9578 {
9582 }
9588 {
9591 Elf32_compact_rel cpt;
9593 /* ??? The section symbols for the output sections were set up in
9594 _bfd_elf_final_link. SGI sets the STT_NOTYPE attribute for these
9595 symbols. Should we do so? */
9600 {
9601 Elf32_Internal_Msym msym;
9607 {
9610 bfd_mips_elf_swap_msym_out
9614 }
9615 }
9618 {
9619 /* Write .compact_rel section out. */
9622 {
9634 /* Clean up a dummy stub function entry in .text. */
9638 {
9639 file_ptr dummy_offset;
9644 MIPS_FUNCTION_STUB_SIZE);
9645 }
9646 }
9647 }
9649 /* We need to sort the entries of the dynamic relocation section. */
9652 {
9658 {
9663 }
9664 }
9666 /* Clean up a first relocation in .rel.dyn. */
9671 }
9674 }
9675 \f
9676 /* Support for core dump NOTE sections */
9677 static boolean
9681 {
9686 {
9691 /* pr_cursig */
9694 /* pr_pid */
9697 /* pr_reg */
9702 }
9704 /* Make a ".reg/999" section. */
9707 }
9709 static boolean
9713 {
9715 {
9724 }
9726 /* Note that for some reason, a spurious space is tacked
9727 onto the end of the args in some (at least one anyway)
9728 implementations, so strip it off if it exists. */
9730 {
9736 }
9739 }
9740 \f
9741 #define PDR_SIZE 32
9743 static boolean
9748 {
9774 {
9777 }
9784 {
9786 {
9788 skip ++;
9789 }
9790 }
9793 {
9797 }
9798 else
9805 }
9807 static boolean
9810 {
9814 }
9816 static boolean
9821 {
9836 {
9842 }
9847 }
9848 \f
9849 /* This is almost identical to bfd_generic_get_... except that some
9850 MIPS relocations need to be handled specially. Sigh. */
9859 boolean relocateable;
9861 {
9862 /* Get enough memory to hold the stuff */
9877 /* read in the section */
9879 input_section,
9885 /* We're not relaxing the section, so just copy the size info */
9890 input_section,
9891 reloc_vector,
9892 symbols);
9897 {
9899 /* for mips */
9903 {
9906 /* Skip all this stuff if we aren't mixing formats. */
9910 else
9911 {
9914 }
9915 lookup:
9917 {
9919 {
9933 /* @@FIXME ignoring warning for now */
9938 }
9939 }
9940 else
9942 }
9943 /* end mips */
9945 parent++)
9946 {
9948 bfd_reloc_status_type r;
9950 /* Specific to MIPS: Deal with relocation types that require
9951 knowing the gp of the output bfd. */
9954 {
9955 /* The special_function wouldn't get called anyways. */
9956 }
9958 {
9959 /* The gp isn't there; let the special function code
9960 fall over on its own. */
9961 }
9964 {
9965 /* bypass special_function call */
9969 }
9970 /* end mips specific stuff */
9975 input_section,
9978 skip_bfd_perform_relocation:
9981 {
9984 /* A partial link, so keep the relocs */
9987 }
9990 {
9992 {
10018 }
10020 }
10021 }
10022 }
10027 error_return:
10031 }
10033 #define bfd_elf32_bfd_get_relocated_section_contents \
10034 elf32_mips_get_relocated_section_contents
10035 \f
10036 /* ECOFF swapping routines. These are used when dealing with the
10037 .mdebug section, which is in the ECOFF debugging format. */
10039 /* Symbol table magic number. */
10040 magicSym,
10041 /* Alignment of debugging information. E.g., 4. */
10043 /* Sizes of external symbolic information. */
10052 /* Functions to swap in external symbolic data. */
10053 ecoff_swap_hdr_in,
10054 ecoff_swap_dnr_in,
10055 ecoff_swap_pdr_in,
10056 ecoff_swap_sym_in,
10057 ecoff_swap_opt_in,
10058 ecoff_swap_fdr_in,
10059 ecoff_swap_rfd_in,
10060 ecoff_swap_ext_in,
10061 _bfd_ecoff_swap_tir_in,
10062 _bfd_ecoff_swap_rndx_in,
10063 /* Functions to swap out external symbolic data. */
10064 ecoff_swap_hdr_out,
10065 ecoff_swap_dnr_out,
10066 ecoff_swap_pdr_out,
10067 ecoff_swap_sym_out,
10068 ecoff_swap_opt_out,
10069 ecoff_swap_fdr_out,
10070 ecoff_swap_rfd_out,
10071 ecoff_swap_ext_out,
10072 _bfd_ecoff_swap_tir_out,
10073 _bfd_ecoff_swap_rndx_out,
10074 /* Function to read in symbolic data. */
10075 _bfd_mips_elf_read_ecoff_info
10076 };
10077 \f
10078 #define ELF_ARCH bfd_arch_mips
10079 #define ELF_MACHINE_CODE EM_MIPS
10081 /* The SVR4 MIPS ABI says that this should be 0x10000, but Irix 5 uses
10082 a value of 0x1000, and we are compatible. */
10083 #define ELF_MAXPAGESIZE 0x1000
10085 #define elf_backend_collect true
10086 #define elf_backend_type_change_ok true
10087 #define elf_backend_can_gc_sections true
10088 #define elf_info_to_howto mips_info_to_howto_rela
10089 #define elf_info_to_howto_rel mips_info_to_howto_rel
10090 #define elf_backend_sym_is_global mips_elf_sym_is_global
10091 #define elf_backend_object_p _bfd_mips_elf_object_p
10092 #define elf_backend_symbol_processing _bfd_mips_elf_symbol_processing
10093 #define elf_backend_section_processing _bfd_mips_elf_section_processing
10094 #define elf_backend_section_from_shdr _bfd_mips_elf_section_from_shdr
10095 #define elf_backend_fake_sections _bfd_mips_elf_fake_sections
10096 #define elf_backend_section_from_bfd_section \
10097 _bfd_mips_elf_section_from_bfd_section
10098 #define elf_backend_add_symbol_hook _bfd_mips_elf_add_symbol_hook
10099 #define elf_backend_link_output_symbol_hook \
10100 _bfd_mips_elf_link_output_symbol_hook
10101 #define elf_backend_create_dynamic_sections \
10102 _bfd_mips_elf_create_dynamic_sections
10103 #define elf_backend_check_relocs _bfd_mips_elf_check_relocs
10104 #define elf_backend_adjust_dynamic_symbol \
10105 _bfd_mips_elf_adjust_dynamic_symbol
10106 #define elf_backend_always_size_sections \
10107 _bfd_mips_elf_always_size_sections
10108 #define elf_backend_size_dynamic_sections \
10109 _bfd_mips_elf_size_dynamic_sections
10110 #define elf_backend_relocate_section _bfd_mips_elf_relocate_section
10111 #define elf_backend_finish_dynamic_symbol \
10112 _bfd_mips_elf_finish_dynamic_symbol
10113 #define elf_backend_finish_dynamic_sections \
10114 _bfd_mips_elf_finish_dynamic_sections
10115 #define elf_backend_final_write_processing \
10116 _bfd_mips_elf_final_write_processing
10117 #define elf_backend_additional_program_headers \
10118 _bfd_mips_elf_additional_program_headers
10119 #define elf_backend_modify_segment_map _bfd_mips_elf_modify_segment_map
10120 #define elf_backend_gc_mark_hook _bfd_mips_elf_gc_mark_hook
10121 #define elf_backend_gc_sweep_hook _bfd_mips_elf_gc_sweep_hook
10122 #define elf_backend_copy_indirect_symbol \
10123 _bfd_mips_elf_copy_indirect_symbol
10124 #define elf_backend_hide_symbol _bfd_mips_elf_hide_symbol
10125 #define elf_backend_grok_prstatus _bfd_elf32_mips_grok_prstatus
10126 #define elf_backend_grok_psinfo _bfd_elf32_mips_grok_psinfo
10127 #define elf_backend_ecoff_debug_swap &mips_elf32_ecoff_debug_swap
10129 #define elf_backend_got_header_size (4 * MIPS_RESERVED_GOTNO)
10130 #define elf_backend_plt_header_size 0
10131 #define elf_backend_may_use_rel_p 1
10132 #define elf_backend_may_use_rela_p 0
10133 #define elf_backend_default_use_rela_p 0
10134 #define elf_backend_sign_extend_vma true
10136 #define elf_backend_discard_info _bfd_elf32_mips_discard_info
10137 #define elf_backend_ignore_discarded_relocs \
10138 _bfd_elf32_mips_ignore_discarded_relocs
10139 #define elf_backend_write_section _bfd_elf32_mips_write_section
10141 #define bfd_elf32_bfd_is_local_label_name \
10142 mips_elf_is_local_label_name
10143 #define bfd_elf32_find_nearest_line _bfd_mips_elf_find_nearest_line
10144 #define bfd_elf32_set_section_contents _bfd_mips_elf_set_section_contents
10145 #define bfd_elf32_bfd_link_hash_table_create \
10146 _bfd_mips_elf_link_hash_table_create
10147 #define bfd_elf32_bfd_final_link _bfd_mips_elf_final_link
10148 #define bfd_elf32_bfd_copy_private_bfd_data \
10149 _bfd_mips_elf_copy_private_bfd_data
10150 #define bfd_elf32_bfd_merge_private_bfd_data \
10151 _bfd_mips_elf_merge_private_bfd_data
10152 #define bfd_elf32_bfd_set_private_flags _bfd_mips_elf_set_private_flags
10153 #define bfd_elf32_bfd_print_private_bfd_data \
10154 _bfd_mips_elf_print_private_bfd_data
10156 /* Support for SGI-ish mips targets. */
10157 #define TARGET_LITTLE_SYM bfd_elf32_littlemips_vec
10159 #define TARGET_BIG_SYM bfd_elf32_bigmips_vec
10164 /* Support for traditional mips targets. */
10167 #undef TARGET_LITTLE_SYM
10168 #undef TARGET_LITTLE_NAME
10169 #undef TARGET_BIG_SYM
10170 #undef TARGET_BIG_NAME
10172 #define TARGET_LITTLE_SYM bfd_elf32_tradlittlemips_vec
10174 #define TARGET_BIG_SYM bfd_elf32_tradbigmips_vec
10177 /* Include the target file again for this target */