| blob | c62c5db213d3184f25b76d54afc5af907bbdad7c |
1 /* MIPS-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
5 Most of the information added by Ian Lance Taylor, Cygnus Support,
6 <ian@cygnus.com>.
7 N32/64 ABI support added by Mark Mitchell, CodeSourcery, LLC.
8 <mark@codesourcery.com>
9 Traditional MIPS targets support added by Koundinya.K, Dansk Data
10 Elektronik & Operations Research Group. <kk@ddeorg.soft.net>
12 This file is part of BFD, the Binary File Descriptor library.
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 2 of the License, or
17 (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
24 You should have received a copy of the GNU General Public License
25 along with this program; if not, write to the Free Software
26 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
28 /* This file handles MIPS ELF targets. SGI Irix 5 uses a slightly
29 different MIPS ELF from other targets. This matters when linking.
30 This file supports both, switching at runtime. */
40 /* Get the ECOFF swapping routines. */
46 #define ECOFF_SIGNED_32
49 /* This structure is used to hold .got information when linking. It
50 is stored in the tdata field of the bfd_elf_section_data structure. */
52 struct mips_got_info
53 {
54 /* The global symbol in the GOT with the lowest index in the dynamic
55 symbol table. */
57 /* The number of global .got entries. */
59 /* The number of local .got entries. */
61 /* The number of local .got entries we have used. */
63 };
65 /* The MIPS ELF linker needs additional information for each symbol in
66 the global hash table. */
68 struct mips_elf_link_hash_entry
69 {
72 /* External symbol information. */
73 EXTR esym;
75 /* Number of R_MIPS_32, R_MIPS_REL32, or R_MIPS_64 relocs against
76 this symbol. */
79 /* If the R_MIPS_32, R_MIPS_REL32, or R_MIPS_64 reloc is against
80 a readonly section. */
81 boolean readonly_reloc;
83 /* The index of the first dynamic relocation (in the .rel.dyn
84 section) against this symbol. */
87 /* We must not create a stub for a symbol that has relocations
88 related to taking the function's address, i.e. any but
89 R_MIPS_CALL*16 ones -- see "MIPS ABI Supplement, 3rd Edition",
90 p. 4-20. */
91 boolean no_fn_stub;
93 /* If there is a stub that 32 bit functions should use to call this
94 16 bit function, this points to the section containing the stub. */
97 /* Whether we need the fn_stub; this is set if this symbol appears
98 in any relocs other than a 16 bit call. */
99 boolean need_fn_stub;
101 /* If there is a stub that 16 bit functions should use to call this
102 32 bit function, this points to the section containing the stub. */
105 /* This is like the call_stub field, but it is used if the function
106 being called returns a floating point value. */
108 };
110 static bfd_reloc_status_type mips32_64bit_reloc
116 static void mips_info_to_howto_rel
118 static void mips_info_to_howto_rela
120 static void bfd_mips_elf32_swap_gptab_in
122 static void bfd_mips_elf32_swap_gptab_out
124 #if 0
125 static void bfd_mips_elf_swap_msym_in
127 #endif
128 static void bfd_mips_elf_swap_msym_out
131 static boolean mips_elf_create_procedure_table
137 static boolean mips_elf_is_local_label_name
142 static bfd_reloc_status_type mips16_jump_reloc
144 static bfd_reloc_status_type mips16_gprel_reloc
146 static boolean mips_elf_create_compact_rel_section
148 static boolean mips_elf_create_got_section
150 static bfd_reloc_status_type mips_elf_final_gp
157 static void mips_elf_irix6_finish_dynamic_symbol
164 static bfd_vma mips_elf_global_got_index
166 static bfd_vma mips_elf_local_got_index
168 static bfd_vma mips_elf_got_offset_from_index
170 static boolean mips_elf_record_global_got_symbol
173 static bfd_vma mips_elf_got_page
178 static bfd_reloc_status_type mips_elf_calculate_relocation
182 boolean *));
183 static bfd_vma mips_elf_obtain_contents
185 static boolean mips_elf_perform_relocation
190 static boolean mips_elf_sort_hash_table_f
192 static boolean mips_elf_sort_hash_table
197 static boolean mips_elf_local_relocation_p
199 static bfd_vma mips_elf_create_local_got_entry
201 static bfd_vma mips_elf_got16_entry
203 static boolean mips_elf_create_dynamic_relocation
207 static void mips_elf_allocate_dynamic_relocations
209 static boolean mips_elf_stub_section_p
211 static int sort_dynamic_relocs
213 static void _bfd_mips_elf_hide_symbol
215 static void _bfd_mips_elf_copy_indirect_symbol
218 static boolean _bfd_elf32_mips_grok_prstatus
220 static boolean _bfd_elf32_mips_grok_psinfo
222 static boolean _bfd_elf32_mips_discard_info
224 static boolean _bfd_elf32_mips_ignore_discarded_relocs
226 static boolean _bfd_elf32_mips_write_section
231 #ifdef BFD64
234 #endif
236 /* The level of IRIX compatibility we're striving for. */
239 ict_none,
240 ict_irix5,
241 ict_irix6
244 /* This will be used when we sort the dynamic relocation records. */
247 /* Nonzero if ABFD is using the N32 ABI. */
249 #define ABI_N32_P(abfd) \
250 ((elf_elfheader (abfd)->e_flags & EF_MIPS_ABI2) != 0)
252 /* Nonzero if ABFD is using the 64-bit ABI. */
253 #define ABI_64_P(abfd) \
254 ((elf_elfheader (abfd)->e_ident[EI_CLASS] == ELFCLASS64) != 0)
256 /* Depending on the target vector we generate some version of Irix
257 executables or "normal" MIPS ELF ABI executables. */
258 #ifdef BFD64
259 #define IRIX_COMPAT(abfd) \
260 (((abfd->xvec == &bfd_elf64_tradbigmips_vec) || \
261 (abfd->xvec == &bfd_elf64_tradlittlemips_vec) || \
262 (abfd->xvec == &bfd_elf32_tradbigmips_vec) || \
263 (abfd->xvec == &bfd_elf32_tradlittlemips_vec)) ? ict_none : \
264 ((ABI_N32_P (abfd) || ABI_64_P (abfd)) ? ict_irix6 : ict_irix5))
265 #else
266 #define IRIX_COMPAT(abfd) \
267 (((abfd->xvec == &bfd_elf32_tradbigmips_vec) || \
268 (abfd->xvec == &bfd_elf32_tradlittlemips_vec)) ? ict_none : \
269 ((ABI_N32_P (abfd) || ABI_64_P (abfd)) ? ict_irix6 : ict_irix5))
270 #endif
272 #define NEWABI_P(abfd) (ABI_N32_P(abfd) || ABI_64_P(abfd))
274 /* Whether we are trying to be compatible with IRIX at all. */
275 #define SGI_COMPAT(abfd) \
276 (IRIX_COMPAT (abfd) != ict_none)
278 /* The name of the msym section. */
281 /* The name of the srdata section. */
284 /* The name of the options section. */
285 #define MIPS_ELF_OPTIONS_SECTION_NAME(abfd) \
288 /* The name of the stub section. */
289 #define MIPS_ELF_STUB_SECTION_NAME(abfd) \
292 /* The name of the dynamic relocation section. */
295 /* The size of an external REL relocation. */
296 #define MIPS_ELF_REL_SIZE(abfd) \
297 (get_elf_backend_data (abfd)->s->sizeof_rel)
299 /* The size of an external dynamic table entry. */
300 #define MIPS_ELF_DYN_SIZE(abfd) \
301 (get_elf_backend_data (abfd)->s->sizeof_dyn)
303 /* The size of a GOT entry. */
304 #define MIPS_ELF_GOT_SIZE(abfd) \
305 (get_elf_backend_data (abfd)->s->arch_size / 8)
307 /* The size of a symbol-table entry. */
308 #define MIPS_ELF_SYM_SIZE(abfd) \
309 (get_elf_backend_data (abfd)->s->sizeof_sym)
311 /* The default alignment for sections, as a power of two. */
312 #define MIPS_ELF_LOG_FILE_ALIGN(abfd) \
313 (get_elf_backend_data (abfd)->s->file_align == 8 ? 3 : 2)
315 /* Get word-sized data. */
316 #define MIPS_ELF_GET_WORD(abfd, ptr) \
317 (ABI_64_P (abfd) ? bfd_get_64 (abfd, ptr) : bfd_get_32 (abfd, ptr))
319 /* Put out word-sized data. */
320 #define MIPS_ELF_PUT_WORD(abfd, val, ptr) \
321 (ABI_64_P (abfd) \
322 ? bfd_put_64 (abfd, val, ptr) \
323 : bfd_put_32 (abfd, val, ptr))
325 /* Add a dynamic symbol table-entry. */
326 #ifdef BFD64
327 #define MIPS_ELF_ADD_DYNAMIC_ENTRY(info, tag, val) \
328 (ABI_64_P (elf_hash_table (info)->dynobj) \
329 ? bfd_elf64_add_dynamic_entry (info, (bfd_vma) tag, (bfd_vma) val) \
330 : bfd_elf32_add_dynamic_entry (info, (bfd_vma) tag, (bfd_vma) val))
331 #else
332 #define MIPS_ELF_ADD_DYNAMIC_ENTRY(info, tag, val) \
333 (ABI_64_P (elf_hash_table (info)->dynobj) \
334 ? (boolean) (abort (), false) \
335 : bfd_elf32_add_dynamic_entry (info, (bfd_vma) tag, (bfd_vma) val))
336 #endif
338 /* The number of local .got entries we reserve. */
339 #define MIPS_RESERVED_GOTNO (2)
341 /* Instructions which appear in a stub. For some reason the stub is
342 slightly different on an SGI system. */
343 #define ELF_MIPS_GP_OFFSET(abfd) (SGI_COMPAT (abfd) ? 0x7ff0 : 0x8000)
344 #define STUB_LW(abfd) \
345 (SGI_COMPAT (abfd) \
346 ? (ABI_64_P (abfd) \
350 #define STUB_MOVE(abfd) \
353 #define STUB_LI16(abfd) \
355 #define MIPS_FUNCTION_STUB_SIZE (16)
357 #if 0
358 /* We no longer try to identify particular sections for the .dynsym
359 section. When we do, we wind up crashing if there are other random
360 sections with relocations. */
362 /* Names of sections which appear in the .dynsym section in an Irix 5
363 executable. */
366 {
375 NULL
376 };
378 #define SIZEOF_MIPS_DYNSYM_SECNAMES \
379 (sizeof mips_elf_dynsym_sec_names / sizeof mips_elf_dynsym_sec_names[0])
381 /* The number of entries in mips_elf_dynsym_sec_names which go in the
382 text segment. */
384 #define MIPS_TEXT_DYNSYM_SECNO (3)
388 /* The names of the runtime procedure table symbols used on Irix 5. */
391 {
395 NULL
396 };
398 /* These structures are used to generate the .compact_rel section on
399 Irix 5. */
402 {
412 {
422 {
432 {
441 {
448 {
453 /* These are the constants used to swap the bitfields in a crinfo. */
455 #define CRINFO_CTYPE (0x1)
456 #define CRINFO_CTYPE_SH (31)
457 #define CRINFO_RTYPE (0xf)
458 #define CRINFO_RTYPE_SH (27)
459 #define CRINFO_DIST2TO (0xff)
460 #define CRINFO_DIST2TO_SH (19)
461 #define CRINFO_RELVADDR (0x7ffff)
462 #define CRINFO_RELVADDR_SH (0)
464 /* A compact relocation info has long (3 words) or short (2 words)
465 formats. A short format doesn't have VADDR field and relvaddr
466 fields contains ((VADDR - vaddr of the previous entry) >> 2). */
467 #define CRF_MIPS_LONG 1
468 #define CRF_MIPS_SHORT 0
470 /* There are 4 types of compact relocation at least. The value KONST
471 has different meaning for each type:
473 (type) (konst)
474 CT_MIPS_REL32 Address in data
475 CT_MIPS_WORD Address in word (XXX)
476 CT_MIPS_GPHI_LO GP - vaddr
477 CT_MIPS_JMPAD Address to jump
478 */
480 #define CRT_MIPS_REL32 0xa
481 #define CRT_MIPS_WORD 0xb
482 #define CRT_MIPS_GPHI_LO 0xc
483 #define CRT_MIPS_JMPAD 0xd
485 #define mips_elf_set_cr_format(x,format) ((x).ctype = (format))
486 #define mips_elf_set_cr_type(x,type) ((x).rtype = (type))
487 #define mips_elf_set_cr_dist2to(x,v) ((x).dist2to = (v))
488 #define mips_elf_set_cr_relvaddr(x,d) ((x).relvaddr = (d)<<2)
490 static void bfd_elf32_swap_compact_rel_out
492 static void bfd_elf32_swap_crinfo_out
495 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
496 from smaller values. Start with zero, widen, *then* decrement. */
497 #define MINUS_ONE (((bfd_vma)0) - 1)
499 /* The relocation table used for SHT_REL sections. */
502 {
503 /* No relocation. */
518 /* 16 bit relocation. */
533 /* 32 bit relocation. */
548 /* 32 bit symbol relative relocation. */
563 /* 26 bit jump address. */
571 /* This needs complex overflow
572 detection, because the upper four
573 bits must match the PC + 4. */
581 /* High 16 bits of symbol value. */
596 /* Low 16 bits of symbol value. */
611 /* GP relative reference. */
626 /* Reference to literal section. */
641 /* Reference to global offset table. */
656 /* 16 bit PC relative reference. */
671 /* 16 bit call through global offset table. */
686 /* 32 bit GP relative reference. */
701 /* The remaining relocs are defined on Irix 5, although they are
702 not defined by the ABI. */
707 /* A 5 bit shift field. */
722 /* A 6 bit shift field. */
723 /* FIXME: This is not handled correctly; a special function is
724 needed to put the most significant bit in the right place. */
739 /* A 64 bit relocation. */
754 /* Displacement in the global offset table. */
769 /* Displacement to page pointer in the global offset table. */
784 /* Offset from page pointer in the global offset table. */
799 /* High 16 bits of displacement in global offset table. */
814 /* Low 16 bits of displacement in global offset table. */
829 /* 64 bit subtraction. Used in the N32 ABI. */
844 /* Used to cause the linker to insert and delete instructions? */
849 /* Get the higher value of a 64 bit addend. */
864 /* Get the highest value of a 64 bit addend. */
879 /* High 16 bits of displacement in global offset table. */
894 /* Low 16 bits of displacement in global offset table. */
909 /* Section displacement. */
929 /* Protected jump conversion. This is an optimization hint. No
930 relocation is required for correctness. */
944 };
946 /* The relocation table used for SHT_RELA sections. */
949 {
950 /* No relocation. */
965 /* 16 bit relocation. */
980 /* 32 bit relocation. */
995 /* 32 bit symbol relative relocation. */
1010 /* 26 bit jump address. */
1018 /* This needs complex overflow
1019 detection, because the upper 36
1020 bits must match the PC + 4. */
1028 /* R_MIPS_HI16 and R_MIPS_LO16 are unsupported for 64 bit REL. */
1029 /* High 16 bits of symbol value. */
1044 /* Low 16 bits of symbol value. */
1059 /* GP relative reference. */
1074 /* Reference to literal section. */
1089 /* Reference to global offset table. */
1090 /* FIXME: This is not handled correctly. */
1105 /* 16 bit PC relative reference. */
1120 /* 16 bit call through global offset table. */
1121 /* FIXME: This is not handled correctly. */
1136 /* 32 bit GP relative reference. */
1155 /* A 5 bit shift field. */
1170 /* A 6 bit shift field. */
1171 /* FIXME: Not handled correctly. */
1186 /* 64 bit relocation. */
1201 /* Displacement in the global offset table. */
1202 /* FIXME: Not handled correctly. */
1217 /* Displacement to page pointer in the global offset table. */
1218 /* FIXME: Not handled correctly. */
1233 /* Offset from page pointer in the global offset table. */
1234 /* FIXME: Not handled correctly. */
1249 /* High 16 bits of displacement in global offset table. */
1250 /* FIXME: Not handled correctly. */
1265 /* Low 16 bits of displacement in global offset table. */
1266 /* FIXME: Not handled correctly. */
1281 /* 64 bit substraction. */
1282 /* FIXME: Not handled correctly. */
1297 /* Insert the addend as an instruction. */
1298 /* FIXME: Not handled correctly. */
1313 /* Insert the addend as an instruction, and change all relocations
1314 to refer to the old instruction at the address. */
1315 /* FIXME: Not handled correctly. */
1330 /* Delete a 32 bit instruction. */
1331 /* FIXME: Not handled correctly. */
1346 /* Get the higher value of a 64 bit addend. */
1361 /* Get the highest value of a 64 bit addend. */
1376 /* High 16 bits of displacement in global offset table. */
1377 /* FIXME: Not handled correctly. */
1392 /* Low 16 bits of displacement in global offset table. */
1393 /* FIXME: Not handled correctly. */
1408 /* Section displacement, used by an associated event location section. */
1409 /* FIXME: Not handled correctly. */
1438 /* These two are obsolete. */
1442 /* Similiar to R_MIPS_REL32, but used for relocations in a GOT section.
1443 It must be used for multigot GOT's (and only there). */
1458 /* Protected jump conversion. This is an optimization hint. No
1459 relocation is required for correctness. */
1473 };
1475 /* The reloc used for BFD_RELOC_CTOR when doing a 64 bit link. This
1476 is a hack to make the linker think that we need 64 bit values. */
1492 /* The reloc used for the mips16 jump instruction. */
1501 /* This needs complex overflow
1502 detection, because the upper four
1503 bits must match the PC. */
1511 /* The reloc used for the mips16 gprel instruction. */
1527 /* GNU extensions for embedded-pic. */
1528 /* High 16 bits of symbol value, pc-relative. */
1544 /* Low 16 bits of symbol value, pc-relative. */
1560 /* 16 bit offset for pc-relative branches. */
1576 /* 64 bit pc-relative. */
1592 /* 32 bit pc-relative. */
1608 /* GNU extension to record C++ vtable hierarchy */
1624 /* GNU extension to record C++ vtable member usage */
1640 /* Do a R_MIPS_HI16 relocation. This has to be done in combination
1641 with a R_MIPS_LO16 reloc, because there is a carry from the LO16 to
1642 the HI16. Here we just save the information we need; we do the
1643 actual relocation when we see the LO16.
1645 MIPS ELF requires that the LO16 immediately follow the HI16. As a
1646 GNU extension, for non-pc-relative relocations, we permit an
1647 arbitrary number of HI16 relocs to be associated with a single LO16
1648 reloc. This extension permits gcc to output the HI and LO relocs
1649 itself.
1651 This cannot be done for PC-relative relocations because both the HI16
1652 and LO16 parts of the relocations must be done relative to the LO16
1653 part, and there can be carry to or borrow from the HI16 part. */
1655 struct mips_hi16
1656 {
1659 bfd_vma addend;
1660 };
1662 /* FIXME: This should not be a static variable. */
1666 bfd_reloc_status_type
1668 reloc_entry,
1669 symbol,
1670 data,
1671 input_section,
1672 output_bfd,
1673 error_message)
1677 PTR data;
1681 {
1682 bfd_reloc_status_type ret;
1683 bfd_vma relocation;
1686 /* If we're relocating, and this an external symbol, we don't want
1687 to change anything. */
1691 {
1694 }
1699 {
1700 boolean relocateable;
1701 bfd_vma gp;
1708 else
1709 {
1712 }
1720 }
1721 else
1722 {
1729 else
1731 }
1740 /* Save the information, and let LO16 do the actual relocation. */
1753 }
1755 /* Do a R_MIPS_LO16 relocation. This is a straightforward 16 bit
1756 inplace relocation; this function exists in order to do the
1757 R_MIPS_HI16 relocation described above. */
1759 bfd_reloc_status_type
1761 reloc_entry,
1762 symbol,
1763 data,
1764 input_section,
1765 output_bfd,
1766 error_message)
1770 PTR data;
1774 {
1775 arelent gp_disp_relent;
1778 {
1783 {
1789 /* Do the HI16 relocation. Note that we actually don't need
1790 to know anything about the LO16 itself, except where to
1791 find the low 16 bits of the addend needed by the LO16. */
1795 /* The low order 16 bits are always treated as a signed
1796 value. */
1801 /* If PC-relative, we need to subtract out the address of the LO
1802 half of the HI/LO. (The actual relocation is relative
1803 to that instruction.) */
1807 /* At this point, "val" has the value of the combined HI/LO
1808 pair. If the low order 16 bits (which will be used for
1809 the LO16 insn) are negative, then we will need an
1810 adjustment for the high order 16 bits. */
1819 {
1823 }
1828 }
1831 }
1833 {
1834 bfd_reloc_status_type ret;
1837 /* FIXME: Does this case ever occur? */
1854 }
1856 /* Now do the LO16 reloc in the usual way. */
1859 }
1861 /* Do a R_MIPS_GOT16 reloc. This is a reloc against the global offset
1862 table used for PIC code. If the symbol is an external symbol, the
1863 instruction is modified to contain the offset of the appropriate
1864 entry in the global offset table. If the symbol is a section
1865 symbol, the next reloc is a R_MIPS_LO16 reloc. The two 16 bit
1866 addends are combined to form the real addend against the section
1867 symbol; the GOT16 is modified to contain the offset of an entry in
1868 the global offset table, and the LO16 is modified to offset it
1869 appropriately. Thus an offset larger than 16 bits requires a
1870 modified value in the global offset table.
1872 This implementation suffices for the assembler, but the linker does
1873 not yet know how to create global offset tables. */
1875 bfd_reloc_status_type
1877 reloc_entry,
1878 symbol,
1879 data,
1880 input_section,
1881 output_bfd,
1882 error_message)
1886 PTR data;
1890 {
1891 /* If we're relocating, and this an external symbol, we don't want
1892 to change anything. */
1896 {
1899 }
1901 /* If we're relocating, and this is a local symbol, we can handle it
1902 just like HI16. */
1909 }
1911 /* Set the GP value for OUTPUT_BFD. Returns false if this is a
1912 dangerous relocation. */
1914 static boolean
1918 {
1923 /* If we've already figured out what GP will be, just return it. */
1931 /* The linker script will have created a symbol named `_gp' with the
1932 appropriate value. */
1935 else
1936 {
1938 {
1943 {
1947 }
1948 }
1949 }
1952 {
1953 /* Only get the error once. */
1957 }
1960 }
1962 /* We have to figure out the gp value, so that we can adjust the
1963 symbol value correctly. We look up the symbol _gp in the output
1964 BFD. If we can't find it, we're stuck. We cache it in the ELF
1965 target data. We don't need to adjust the symbol value for an
1966 external symbol if we are producing relocateable output. */
1968 static bfd_reloc_status_type
1972 boolean relocateable;
1975 {
1978 {
1981 }
1985 && (! relocateable
1987 {
1989 {
1990 /* Make up a value. */
1993 }
1995 {
1999 }
2000 }
2003 }
2005 /* Do a R_MIPS_GPREL16 relocation. This is a 16 bit value which must
2006 become the offset from the gp register. This function also handles
2007 R_MIPS_LITERAL relocations, although those can be handled more
2008 cleverly because the entries in the .lit8 and .lit4 sections can be
2009 merged. */
2015 bfd_reloc_status_type
2021 PTR data;
2025 {
2026 boolean relocateable;
2027 bfd_reloc_status_type ret;
2028 bfd_vma gp;
2030 /* If we're relocating, and this is an external symbol with no
2031 addend, we don't want to change anything. We will only have an
2032 addend if this is a newly created reloc, not read from an ELF
2033 file. */
2037 {
2040 }
2044 else
2045 {
2048 }
2057 }
2059 static bfd_reloc_status_type
2061 gp)
2066 boolean relocateable;
2067 PTR data;
2068 bfd_vma gp;
2069 {
2070 bfd_vma relocation;
2076 else
2087 /* Set val to the offset into the section or symbol. */
2089 {
2090 /* This case occurs with the 64-bit MIPS ELF ABI. */
2092 }
2093 else
2094 {
2098 }
2100 /* Adjust val for the final section location and GP value. If we
2101 are producing relocateable output, we don't want to do this for
2102 an external symbol. */
2113 /* Make sure it fit in 16 bits. */
2118 }
2120 /* Do a R_MIPS_GPREL32 relocation. Is this 32 bit value the offset
2121 from the gp register? XXX */
2127 bfd_reloc_status_type
2129 reloc_entry,
2130 symbol,
2131 data,
2132 input_section,
2133 output_bfd,
2134 error_message)
2138 PTR data;
2142 {
2143 boolean relocateable;
2144 bfd_reloc_status_type ret;
2145 bfd_vma gp;
2147 /* If we're relocating, and this is an external symbol with no
2148 addend, we don't want to change anything. We will only have an
2149 addend if this is a newly created reloc, not read from an ELF
2150 file. */
2154 {
2158 }
2161 {
2164 }
2165 else
2166 {
2174 }
2178 }
2180 static bfd_reloc_status_type
2182 gp)
2187 boolean relocateable;
2188 PTR data;
2189 bfd_vma gp;
2190 {
2191 bfd_vma relocation;
2196 else
2206 {
2207 /* This case arises with the 64-bit MIPS ELF ABI. */
2209 }
2210 else
2213 /* Set val to the offset into the section or symbol. */
2216 /* Adjust val for the final section location and GP value. If we
2217 are producing relocateable output, we don't want to do this for
2218 an external symbol. */
2229 }
2231 /* Handle a 64 bit reloc in a 32 bit MIPS ELF file. These are
2232 generated when addresses are 64 bits. The upper 32 bits are a simple
2233 sign extension. */
2235 static bfd_reloc_status_type
2241 PTR data;
2245 {
2246 bfd_reloc_status_type r;
2247 arelent reloc32;
2249 bfd_size_type addr;
2256 /* Do a normal 32 bit relocation on the lower 32 bits. */
2264 /* Sign extend into the upper 32 bits. */
2268 else
2276 }
2278 /* Handle a mips16 jump. */
2280 static bfd_reloc_status_type
2286 PTR data ATTRIBUTE_UNUSED;
2290 {
2294 {
2297 }
2299 /* FIXME. */
2300 {
2308 }
2311 }
2313 /* Handle a mips16 GP relative reloc. */
2315 static bfd_reloc_status_type
2321 PTR data;
2325 {
2326 boolean relocateable;
2327 bfd_reloc_status_type ret;
2328 bfd_vma gp;
2332 /* If we're relocating, and this is an external symbol with no
2333 addend, we don't want to change anything. We will only have an
2334 addend if this is a newly created reloc, not read from an ELF
2335 file. */
2339 {
2342 }
2346 else
2347 {
2350 }
2360 /* Pick up the mips16 extend instruction and the real instruction. */
2364 /* Stuff the current addend back as a 32 bit value, do the usual
2365 relocation, and then clean up. */
2387 }
2389 /* Return the ISA for a MIPS e_flags value. */
2393 flagword flags;
2394 {
2396 {
2411 }
2413 }
2415 /* Return the MACH for a MIPS e_flags value. */
2419 flagword flags;
2420 {
2422 {
2443 {
2472 }
2473 }
2476 }
2478 /* Return printable name for ABI. */
2483 {
2484 flagword flags;
2488 {
2494 else
2506 }
2507 }
2509 /* A mapping from BFD reloc types to MIPS ELF reloc types. */
2512 bfd_reloc_code_real_type bfd_reloc_val;
2514 };
2517 {
2539 };
2541 /* Given a BFD reloc type, return a howto structure. */
2546 bfd_reloc_code_real_type code;
2547 {
2551 {
2554 }
2557 {
2563 /* We need to handle BFD_RELOC_CTOR specially.
2564 Select the right relocation (R_MIPS_32 or R_MIPS_64) based on the
2565 size of addresses on this architecture. */
2568 else
2589 }
2590 }
2592 /* Given a MIPS Elf32_Internal_Rel, fill in an arelent structure. */
2597 {
2599 {
2632 }
2633 }
2635 /* Given a MIPS Elf32_Internal_Rel, fill in an arelent structure. */
2637 static void
2642 {
2648 /* The addend for a GPREL16 or LITERAL relocation comes from the GP
2649 value for the object file. We get the addend now, rather than
2650 when we do the relocation, because the symbol manipulations done
2651 by the linker may cause us to lose track of the input BFD. */
2656 }
2658 /* Given a MIPS Elf32_Internal_Rela, fill in an arelent structure. */
2660 static void
2665 {
2666 /* Since an Elf32_Internal_Rel is an initial prefix of an
2667 Elf32_Internal_Rela, we can just use mips_info_to_howto_rel
2668 above. */
2671 /* If we ever need to do any extra processing with dst->r_addend
2672 (the field omitted in an Elf32_Internal_Rel) we can do it here. */
2673 }
2674 \f
2675 /* A .reginfo section holds a single Elf32_RegInfo structure. These
2676 routines swap this structure in and out. They are used outside of
2677 BFD, so they are globally visible. */
2679 void
2684 {
2691 }
2693 void
2698 {
2705 }
2707 /* In the 64 bit ABI, the .MIPS.options section holds register
2708 information in an Elf64_Reginfo structure. These routines swap
2709 them in and out. They are globally visible because they are used
2710 outside of BFD. These routines are here so that gas can call them
2711 without worrying about whether the 64 bit ABI has been included. */
2713 void
2718 {
2726 }
2728 void
2733 {
2741 }
2743 /* Swap an entry in a .gptab section. Note that these routines rely
2744 on the equivalence of the two elements of the union. */
2746 static void
2751 {
2754 }
2756 static void
2761 {
2764 }
2766 static void
2771 {
2778 }
2780 static void
2785 {
2795 }
2797 /* Swap in an options header. */
2799 void
2804 {
2809 }
2811 /* Swap out an options header. */
2813 void
2818 {
2823 }
2824 #if 0
2825 /* Swap in an MSYM entry. */
2827 static void
2832 {
2835 }
2836 #endif
2837 /* Swap out an MSYM entry. */
2839 static void
2844 {
2847 }
2848 \f
2849 /* Determine whether a symbol is global for the purposes of splitting
2850 the symbol table into global symbols and local symbols. At least
2851 on Irix 5, this split must be between section symbols and all other
2852 symbols. On most ELF targets the split is between static symbols
2853 and externally visible symbols. */
2855 static boolean
2859 {
2862 else
2866 }
2867 \f
2868 /* Set the right machine number for a MIPS ELF file. This is used for
2869 both the 32-bit and the 64-bit ABI. */
2871 boolean
2874 {
2875 /* Irix 5 and 6 are broken. Object file symbol tables are not always
2876 sorted correctly such that local symbols precede global symbols,
2877 and the sh_info field in the symbol table is not always right. */
2884 }
2886 /* The final processing done just before writing out a MIPS ELF object
2887 file. This gets the MIPS architecture right based on the machine
2888 number. This is used by both the 32-bit and the 64-bit ABI. */
2890 void
2893 boolean linker ATTRIBUTE_UNUSED;
2894 {
2902 {
2960 }
2965 /* Set the sh_info field for .gptab sections and other appropriate
2966 info for each special section. */
2970 {
2972 {
3018 else
3019 {
3023 (name
3025 }
3030 }
3031 }
3032 }
3033 \f
3034 /* Function to keep MIPS specific file flags like as EF_MIPS_PIC. */
3036 boolean
3039 flagword flags;
3040 {
3047 }
3049 /* Merge backend specific data from an object file to the output
3050 object file when linking. */
3052 boolean
3056 {
3057 flagword old_flags;
3058 flagword new_flags;
3059 boolean ok;
3063 /* Check if we have the same endianess */
3076 {
3084 {
3088 }
3091 }
3093 /* Check flag compatibility. */
3101 /* Check to see if the input BFD actually contains any sections.
3102 If not, its flags may not have been initialised either, but it cannot
3103 actually cause any incompatibility. */
3105 {
3106 /* Ignore synthetic sections and empty .text, .data and .bss sections
3107 which are automatically generated by gas. */
3114 {
3117 }
3118 }
3125 {
3132 }
3135 {
3142 }
3144 /* Compare the ISA's. */
3147 {
3153 /* If either has no machine specified, just compare the general isa's.
3154 Some combinations of machines are ok, if the isa's match. */
3156 || ! old_mach
3158 )
3159 {
3160 /* Don't warn about mixing code using 32-bit ISAs, or mixing code
3161 using 64-bit ISAs. They will normally use the same data sizes
3162 and calling conventions. */
3166 {
3171 }
3172 else
3173 {
3174 /* Do we need to update the mach field? */
3178 /* Do we need to update the ISA field? */
3180 {
3184 }
3185 }
3186 }
3187 else
3188 {
3195 }
3199 }
3201 /* Compare ABI's. The 64-bit ABI does not use EF_MIPS_ABI. But, it
3202 does set EI_CLASS differently from any 32-bit ABI. */
3206 {
3207 /* Only error if both are set (to different values). */
3211 {
3218 }
3221 }
3223 /* Warn about any other mismatches */
3225 {
3231 }
3234 {
3237 }
3240 }
3241 \f
3242 boolean
3245 PTR ptr;
3246 {
3251 /* Print normal ELF private data. */
3254 /* xgettext:c-format */
3271 else
3288 else
3293 else
3299 }
3300 \f
3301 /* Handle a MIPS specific section when reading an object file. This
3302 is called when elfcode.h finds a section with an unknown type.
3303 This routine supports both the 32-bit and 64-bit ELF ABI.
3305 FIXME: We need to handle the SHF_MIPS_GPREL flag, but I'm not sure
3306 how to. */
3308 boolean
3313 {
3316 /* There ought to be a place to keep ELF backend specific flags, but
3317 at the moment there isn't one. We just keep track of the
3318 sections by their name, instead. Fortunately, the ABI gives
3319 suggested names for all the MIPS specific sections, so we will
3320 probably get away with this. */
3322 {
3382 }
3388 {
3394 }
3396 /* FIXME: We should record sh_info for a .gptab section. */
3398 /* For a .reginfo section, set the gp value in the tdata information
3399 from the contents of this section. We need the gp value while
3400 processing relocs, so we just get it now. The .reginfo section
3401 is not used in the 64-bit MIPS ELF ABI. */
3403 {
3404 Elf32_External_RegInfo ext;
3405 Elf32_RegInfo s;
3413 }
3415 /* For a SHT_MIPS_OPTIONS section, look for a ODK_REGINFO entry, and
3416 set the gp value based on what we find. We may see both
3417 SHT_MIPS_REGINFO and SHT_MIPS_OPTIONS/ODK_REGINFO; in that case,
3418 they should agree. */
3420 {
3428 {
3431 }
3435 {
3436 Elf_Internal_Options intopt;
3441 {
3442 Elf64_Internal_RegInfo intreg;
3444 bfd_mips_elf64_swap_reginfo_in
3450 }
3452 {
3453 Elf32_RegInfo intreg;
3455 bfd_mips_elf32_swap_reginfo_in
3461 }
3463 }
3465 }
3468 }
3470 /* Set the correct type for a MIPS ELF section. We do this by the
3471 section name, which is a hack, but ought to work. This routine is
3472 used by both the 32-bit and the 64-bit ABI. */
3474 boolean
3479 {
3485 {
3488 /* The sh_link field is set in final_write_processing. */
3489 }
3493 {
3496 /* The sh_info field is set in final_write_processing. */
3497 }
3501 {
3503 /* In a shared object on Irix 5.3, the .mdebug section has an
3504 entsize of 0. FIXME: Does this matter? */
3507 else
3509 }
3511 {
3513 /* In a shared object on Irix 5.3, the .reginfo section has an
3514 entsize of 0x18. FIXME: Does this matter? */
3516 {
3519 else
3521 }
3522 else
3524 }
3529 {
3532 #if 0
3533 /* This isn't how the Irix 6 linker behaves. */
3535 #endif
3536 }
3545 {
3548 }
3550 {
3553 /* The sh_info field is set in final_write_processing. */
3554 }
3556 {
3560 }
3564 {
3566 /* The sh_link and sh_info fields are set in
3567 final_write_processing. */
3568 }
3572 {
3575 /* The sh_link field is set in final_write_processing. */
3576 }
3578 {
3582 }
3584 /* The generic elf_fake_sections will set up REL_HDR using the
3585 default kind of relocations. But, we may actually need both
3586 kinds of relocations, so we set up the second header here.
3588 This is not necessary for the O32 ABI since that only uses Elf32_Rel
3589 relocations (cf. System V ABI, MIPS RISC Processor Supplement,
3590 3rd Edition, p. 4-17). It breaks the IRIX 5/6 32-bit ld, since one
3591 of the resulting empty .rela.<section> sections starts with
3592 sh_offset == object size, and ld doesn't allow that. While the check
3593 is arguably bogus for empty or SHT_NOBITS sections, it can easily be
3594 avoided by not emitting those useless sections in the first place. */
3596 {
3607 }
3610 }
3612 /* Given a BFD section, try to locate the corresponding ELF section
3613 index. This is used by both the 32-bit and the 64-bit ABI.
3614 Actually, it's not clear to me that the 64-bit ABI supports these,
3615 but for non-PIC objects we will certainly want support for at least
3616 the .scommon section. */
3618 boolean
3623 {
3625 {
3628 }
3630 {
3633 }
3635 }
3637 /* When are writing out the .options or .MIPS.options section,
3638 remember the bytes we are writing out, so that we can install the
3639 GP value in the section_processing routine. */
3641 boolean
3644 sec_ptr section;
3645 PTR location;
3646 file_ptr offset;
3647 bfd_size_type count;
3648 {
3650 {
3654 {
3659 }
3662 {
3663 bfd_size_type size;
3667 else
3673 }
3676 }
3679 count);
3680 }
3682 /* Work over a section just before writing it out. This routine is
3683 used by both the 32-bit and the 64-bit ABI. FIXME: We recognize
3684 sections that need the SHF_MIPS_GPREL flag by name; there has to be
3685 a better way. */
3687 boolean
3691 {
3694 {
3707 }
3713 {
3716 /* We stored the section contents in the elf_section_data tdata
3717 field in the set_section_contents routine. We save the
3718 section contents so that we don't have to read them again.
3719 At this point we know that elf_gp is set, so we can look
3720 through the section contents to see if there is an
3721 ODK_REGINFO structure. */
3727 {
3728 Elf_Internal_Options intopt;
3733 {
3746 }
3748 {
3761 }
3763 }
3764 }
3767 {
3773 {
3776 }
3778 {
3781 }
3783 {
3786 }
3788 {
3791 }
3793 {
3795 {
3801 }
3802 }
3803 }
3806 }
3807 \f
3808 /* MIPS ELF uses two common sections. One is the usual one, and the
3809 other is for small objects. All the small objects are kept
3810 together, and then referenced via the gp pointer, which yields
3811 faster assembler code. This is what we use for the small common
3812 section. This approach is copied from ecoff.c. */
3817 /* MIPS ELF also uses an acommon section, which represents an
3818 allocated common symbol which may be overridden by a
3819 definition in a shared library. */
3824 /* Handle the special MIPS section numbers that a symbol may use.
3825 This is used for both the 32-bit and the 64-bit ABI. */
3827 void
3831 {
3836 {
3838 /* This section is used in a dynamically linked executable file.
3839 It is an allocated common section. The dynamic linker can
3840 either resolve these symbols to something in a shared
3841 library, or it can just leave them here. For our purposes,
3842 we can consider these symbols to be in a new section. */
3844 {
3845 /* Initialize the acommon section. */
3855 }
3860 /* Common symbols less than the GP size are automatically
3861 treated as SHN_MIPS_SCOMMON symbols on IRIX5. */
3865 /* Fall through. */
3868 {
3869 /* Initialize the small common section. */
3879 }
3896 #endif
3897 }
3898 }
3899 \f
3900 /* When creating an Irix 5 executable, we need REGINFO and RTPROC
3901 segments. */
3903 int
3906 {
3910 /* See if we need a PT_MIPS_REGINFO segment. */
3915 /* See if we need a PT_MIPS_OPTIONS segment. */
3921 /* See if we need a PT_MIPS_RTPROC segment. */
3928 }
3930 /* Modify the segment map for an Irix 5 executable. */
3932 boolean
3935 {
3938 bfd_size_type amt;
3940 /* If there is a .reginfo section, we need a PT_MIPS_REGINFO
3941 segment. */
3944 {
3949 {
3959 /* We want to put it after the PHDR and INTERP segments. */
3968 }
3969 }
3971 /* For IRIX 6, we don't have .mdebug sections, nor does anything but
3972 .dynamic end up in PT_DYNAMIC. However, we do have to insert a
3973 PT_OPTIONS segement immediately following the program header
3974 table. */
3976 {
3982 {
3985 /* Usually, there's a program header table. But, sometimes
3986 there's not (like when running the `ld' testsuite). So,
3987 if there's no program header table, we just put the
3988 options segement at the end. */
4004 }
4005 }
4006 else
4007 {
4009 {
4010 /* If there are .dynamic and .mdebug sections, we make a room
4011 for the RTPROC header. FIXME: Rewrite without section names. */
4015 {
4020 {
4030 {
4034 }
4035 else
4036 {
4039 }
4041 /* We want to put it after the DYNAMIC segment. */
4050 }
4051 }
4052 }
4053 /* On Irix 5, the PT_DYNAMIC segment includes the .dynamic,
4054 .dynstr, .dynsym, and .hash sections, and everything in
4055 between. */
4062 {
4063 /* For a normal mips executable the permissions for the PT_DYNAMIC
4064 segment are read, write and execute. We do that here since
4065 the code in elf.c sets only the read permission. This matters
4066 sometimes for the dynamic linker. */
4068 {
4071 }
4072 }
4075 {
4077 {
4079 };
4087 {
4090 {
4091 bfd_size_type sz;
4100 }
4101 }
4121 {
4127 {
4130 }
4131 }
4134 }
4135 }
4138 }
4139 \f
4140 /* The structure of the runtime procedure descriptor created by the
4141 loader for use by the static exception system. */
4156 #define cbRPDR sizeof (RPDR)
4157 #define rpdNil ((pRPDR) 0)
4159 /* Swap RPDR (runtime procedure table entry) for output. */
4161 static void ecoff_swap_rpdr_out
4164 static void
4169 {
4170 /* ECOFF_PUT_OFF was defined in ecoffswap.h. */
4184 #endif
4185 }
4186 \f
4187 /* Read ECOFF debugging information from a .mdebug section into a
4188 ecoff_debug_info structure. */
4190 boolean
4195 {
4215 /* The symbolic header contains absolute file offsets and sizes to
4216 read. */
4217 #define READ(ptr, offset, count, size, type) \
4218 if (symhdr->count == 0) \
4219 debug->ptr = NULL; \
4220 else \
4221 { \
4222 bfd_size_type amt = (bfd_size_type) size * symhdr->count; \
4223 debug->ptr = (type) bfd_malloc (amt); \
4224 if (debug->ptr == NULL) \
4225 goto error_return; \
4226 if (bfd_seek (abfd, (file_ptr) symhdr->offset, SEEK_SET) != 0 \
4227 || bfd_bread (debug->ptr, amt, abfd) != amt) \
4228 goto error_return; \
4229 }
4243 #undef READ
4250 error_return:
4276 }
4277 \f
4278 /* MIPS ELF local labels start with '$', not 'L'. */
4280 static boolean
4284 {
4288 /* On Irix 6, the labels go back to starting with '.', so we accept
4289 the generic ELF local label syntax as well. */
4291 }
4293 /* MIPS ELF uses a special find_nearest_line routine in order the
4294 handle the ECOFF debugging information. */
4296 struct mips_elf_find_line
4297 {
4300 };
4302 boolean
4308 bfd_vma offset;
4312 {
4317 line_ptr))
4322 line_ptr,
4329 {
4330 flagword origflags;
4335 /* If we are called during a link, mips_elf_final_link may have
4336 cleared the SEC_HAS_CONTENTS field. We force it back on here
4337 if appropriate (which it normally will be). */
4344 {
4345 bfd_size_type external_fdr_size;
4353 {
4356 }
4359 {
4362 }
4364 /* Swap in the FDR information. */
4368 {
4371 }
4375 fraw_end = (fraw_src
4382 /* Note that we don't bother to ever free this information.
4383 find_nearest_line is either called all the time, as in
4384 objdump -l, so the information should be saved, or it is
4385 rarely called, as in ld error messages, so the memory
4386 wasted is unimportant. Still, it would probably be a
4387 good idea for free_cached_info to throw it away. */
4388 }
4392 line_ptr))
4393 {
4396 }
4399 }
4401 /* Fall back on the generic ELF find_nearest_line routine. */
4405 line_ptr);
4406 }
4407 \f
4408 /* The mips16 compiler uses a couple of special sections to handle
4409 floating point arguments.
4411 Section names that look like .mips16.fn.FNNAME contain stubs that
4412 copy floating point arguments from the fp regs to the gp regs and
4413 then jump to FNNAME. If any 32 bit function calls FNNAME, the
4414 call should be redirected to the stub instead. If no 32 bit
4415 function calls FNNAME, the stub should be discarded. We need to
4416 consider any reference to the function, not just a call, because
4417 if the address of the function is taken we will need the stub,
4418 since the address might be passed to a 32 bit function.
4420 Section names that look like .mips16.call.FNNAME contain stubs
4421 that copy floating point arguments from the gp regs to the fp
4422 regs and then jump to FNNAME. If FNNAME is a 32 bit function,
4423 then any 16 bit function that calls FNNAME should be redirected
4424 to the stub instead. If FNNAME is not a 32 bit function, the
4425 stub should be discarded.
4427 .mips16.call.fp.FNNAME sections are similar, but contain stubs
4428 which call FNNAME and then copy the return value from the fp regs
4429 to the gp regs. These stubs store the return value in $18 while
4430 calling FNNAME; any function which might call one of these stubs
4431 must arrange to save $18 around the call. (This case is not
4432 needed for 32 bit functions that call 16 bit functions, because
4433 16 bit functions always return floating point values in both
4434 $f0/$f1 and $2/$3.)
4436 Note that in all cases FNNAME might be defined statically.
4437 Therefore, FNNAME is not used literally. Instead, the relocation
4438 information will indicate which symbol the section is for.
4440 We record any stubs that we find in the symbol table. */
4446 /* MIPS ELF linker hash table. */
4448 struct mips_elf_link_hash_table
4449 {
4451 #if 0
4452 /* We no longer use this. */
4453 /* String section indices for the dynamic section symbols. */
4455 #endif
4456 /* The number of .rtproc entries. */
4457 bfd_size_type procedure_count;
4458 /* The size of the .compact_rel section (if SGI_COMPAT). */
4459 bfd_size_type compact_rel_size;
4460 /* This flag indicates that the value of DT_MIPS_RLD_MAP dynamic
4461 entry is set to the address of __rld_obj_head as in Irix 5. */
4462 boolean use_rld_obj_head;
4463 /* This is the value of the __rld_map or __rld_obj_head symbol. */
4464 bfd_vma rld_value;
4465 /* This is set if we see any mips16 stub sections. */
4466 boolean mips16_stubs_seen;
4467 };
4469 /* Look up an entry in a MIPS ELF linker hash table. */
4471 #define mips_elf_link_hash_lookup(table, string, create, copy, follow) \
4472 ((struct mips_elf_link_hash_entry *) \
4473 elf_link_hash_lookup (&(table)->root, (string), (create), \
4474 (copy), (follow)))
4476 /* Traverse a MIPS ELF linker hash table. */
4478 #define mips_elf_link_hash_traverse(table, func, info) \
4479 (elf_link_hash_traverse \
4480 (&(table)->root, \
4481 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
4482 (info)))
4484 /* Get the MIPS ELF linker hash table from a link_info structure. */
4486 #define mips_elf_hash_table(p) \
4487 ((struct mips_elf_link_hash_table *) ((p)->hash))
4489 static boolean mips_elf_output_extsym
4492 /* Create an entry in a MIPS ELF linker hash table. */
4499 {
4503 /* Allocate the structure if it has not already been allocated by a
4504 subclass. */
4512 /* Call the allocation method of the superclass. */
4517 {
4518 /* Set local fields. */
4520 /* We use -2 as a marker to indicate that the information has
4521 not been set. -1 means there is no associated ifd. */
4531 }
4534 }
4536 static void
4540 boolean force_local;
4541 {
4553 /* FIXME: Do we allocate too much GOT space here? */
4556 }
4558 /* Create a MIPS ELF linker hash table. */
4563 {
4572 mips_elf_link_hash_newfunc))
4573 {
4576 }
4578 #if 0
4579 /* We no longer use this. */
4582 #endif
4590 }
4592 /* Hook called by the linker routine which adds symbols from an object
4593 file. We must handle the special MIPS section numbers here. */
4595 boolean
4604 {
4608 {
4609 /* Skip Irix 5 rld entry name. */
4612 }
4615 {
4617 /* Common symbols less than the GP size are automatically
4618 treated as SHN_MIPS_SCOMMON symbols. */
4622 /* Fall through. */
4630 /* This section is used in a shared object. */
4632 {
4646 /* Initialize the section. */
4661 }
4662 /* This code used to do *secp = bfd_und_section_ptr if
4663 info->shared. I don't know why, and that doesn't make sense,
4664 so I took it out. */
4669 /* Fall through. XXX Can we treat this as allocated data? */
4671 /* This section is used in a shared object. */
4673 {
4687 /* Initialize the section. */
4702 }
4703 /* This code used to do *secp = bfd_und_section_ptr if
4704 info->shared. I don't know why, and that doesn't make sense,
4705 so I took it out. */
4712 }
4718 {
4721 /* Mark __rld_obj_head as dynamic. */
4737 }
4739 /* If this is a mips16 text symbol, add 1 to the value to make it
4740 odd. This will cause something like .word SYM to come up with
4741 the right value when it is loaded into the PC. */
4746 }
4748 /* Structure used to pass information to mips_elf_output_extsym. */
4750 struct extsym_info
4751 {
4756 boolean failed;
4757 };
4759 /* This routine is used to write out ECOFF debugging external symbol
4760 information. It is called via mips_elf_link_hash_traverse. The
4761 ECOFF external symbol information must match the ELF external
4762 symbol information. Unfortunately, at this point we don't know
4763 whether a symbol is required by reloc information, so the two
4764 tables may wind up being different. We must sort out the external
4765 symbol information before we can set the final size of the .mdebug
4766 section, and we must set the size of the .mdebug section before we
4767 can relocate any sections, and we can't know which symbols are
4768 required by relocation until we relocate the sections.
4769 Fortunately, it is relatively unlikely that any symbol will be
4770 stripped but required by a reloc. In particular, it can not happen
4771 when generating a final executable. */
4773 static boolean
4776 PTR data;
4777 {
4779 boolean strip;
4795 else
4802 {
4813 {
4816 /* Use undefined class. Also, set class and type for some
4817 special symbols. */
4821 {
4825 }
4827 {
4832 }
4834 {
4838 }
4839 else
4841 }
4845 else
4846 {
4852 /* When making a shared library and symbol h is the one from
4853 the another shared library, OUTPUT_SECTION may be null. */
4856 else
4857 {
4877 else
4879 }
4880 }
4884 }
4890 {
4902 else
4904 }
4906 {
4911 {
4914 }
4917 {
4918 /* Set type and value for a symbol with a function stub. */
4923 else
4924 {
4930 else
4932 }
4935 #endif
4936 }
4937 }
4942 {
4945 }
4948 }
4950 /* Create a runtime procedure table from the .mdebug section. */
4952 static boolean
4954 PTR handle;
4959 {
4964 PTR rtproc;
4969 bfd_size_type size;
4970 bfd_size_type count;
4973 PDR pdr;
4974 SYMR sym;
4988 {
5026 {
5040 }
5041 }
5047 {
5050 }
5056 erp++;
5061 {
5065 }
5068 /* Set the size and contents of .rtproc section. */
5072 /* Skip this section later on (I don't think this currently
5073 matters, but someday it might). */
5089 error_return:
5101 }
5103 /* A comparison routine used to sort .gptab entries. */
5105 static int
5109 {
5114 }
5116 /* We need to use a special link routine to handle the .reginfo and
5117 the .mdebug sections. We need to merge all instances of these
5118 sections together, not write them all out sequentially. */
5120 boolean
5124 {
5130 Elf32_RegInfo reginfo;
5137 EXTR esym;
5139 bfd_size_type amt;
5142 {
5145 };
5147 {
5150 };
5152 /* If all the things we linked together were PIC, but we're
5153 producing an executable (rather than a shared object), then the
5154 resulting file is CPIC (i.e., it calls PIC code.) */
5158 {
5161 }
5163 /* We'd carefully arranged the dynamic symbol indices, and then the
5164 generic size_dynamic_sections renumbered them out from under us.
5165 Rather than trying somehow to prevent the renumbering, just do
5166 the sort again. */
5168 {
5173 /* When we resort, we must tell mips_elf_sort_hash_table what
5174 the lowest index it may use is. That's the number of section
5175 symbols we're going to add. The generic ELF linker only
5176 adds these symbols when building a shared object. Note that
5177 we count the sections after (possibly) removing the .options
5178 section above. */
5184 /* Make sure we didn't grow the global .got region. */
5193 }
5195 /* On IRIX5, we omit the .options section. On IRIX6, however, we
5196 include it, even though we don't process it quite right. (Some
5197 entries are supposed to be merged.) Empirically, we seem to be
5198 better off including it then not. */
5201 {
5203 {
5212 }
5213 }
5215 /* Get a value for the GP register. */
5217 {
5227 {
5228 bfd_vma lo;
5230 /* Find the GP-relative section with the lowest offset. */
5237 /* And calculate GP relative to that. */
5239 }
5240 else
5241 {
5242 /* If the relocate_section function needs to do a reloc
5243 involving the GP value, it should make a reloc_dangerous
5244 callback to warn that GP is not defined. */
5245 }
5246 }
5248 /* Go through the sections and collect the .reginfo and .mdebug
5249 information. */
5255 {
5257 {
5260 /* We have found the .reginfo section in the output file.
5261 Look through all the link_orders comprising it and merge
5262 the information together. */
5266 {
5269 Elf32_External_RegInfo ext;
5270 Elf32_RegInfo sub;
5273 {
5277 }
5282 /* The linker emulation code has probably clobbered the
5283 size to be zero bytes. */
5301 /* ri_gp_value is set by the function
5302 mips_elf32_section_processing when the section is
5303 finally written out. */
5305 /* Hack: reset the SEC_HAS_CONTENTS flag so that
5306 elf_link_input_bfd ignores this section. */
5308 }
5310 /* Size has been set in mips_elf_always_size_sections */
5313 /* Skip this section later on (I don't think this currently
5314 matters, but someday it might). */
5318 }
5321 {
5323 bfd_vma last;
5325 /* We have found the .mdebug section in the output file.
5326 Look through all the link_orders comprising it and merge
5327 the information together. */
5329 /* FIXME: What should the version stamp be? */
5344 /* We accumulate the debugging information itself in the
5345 debug_info structure. */
5373 {
5377 {
5380 }
5381 else
5386 }
5391 {
5400 {
5404 }
5412 {
5413 /* I don't know what a non MIPS ELF bfd would be
5414 doing with a .mdebug section, but I don't really
5415 want to deal with it. */
5417 }
5424 /* The ECOFF linking code expects that we have already
5425 read in the debugging information and set up an
5426 ecoff_debug_info structure, so we do that now. */
5436 /* Loop through the external symbols. For each one with
5437 interesting information, try to find the symbol in
5438 the linker global hash table and save the information
5439 for the output external symbols. */
5441 eraw_end = (eraw_src
5447 {
5448 EXTR ext;
5465 {
5469 }
5472 }
5474 /* Free up the information we just read. */
5487 /* Hack: reset the SEC_HAS_CONTENTS flag so that
5488 elf_link_input_bfd ignores this section. */
5490 }
5493 {
5494 /* Create .rtproc section. */
5497 {
5506 }
5511 }
5513 /* Build the external symbol information. */
5520 mips_elf_output_extsym,
5525 /* Set the size of the .mdebug section. */
5528 /* Skip this section later on (I don't think this currently
5529 matters, but someday it might). */
5533 }
5536 {
5543 /* The .gptab.sdata and .gptab.sbss sections hold
5544 information describing how the small data area would
5545 change depending upon the -G switch. These sections
5546 not used in executables files. */
5548 {
5552 {
5556 {
5560 }
5564 /* Hack: reset the SEC_HAS_CONTENTS flag so that
5565 elf_link_input_bfd ignores this section. */
5567 }
5569 /* Skip this section later on (I don't think this
5570 currently matters, but someday it might). */
5573 /* Really remove the section. */
5577 ;
5582 }
5584 /* There is one gptab for initialized data, and one for
5585 uninitialized data. */
5590 else
5591 {
5597 }
5599 /* The linker script always combines .gptab.data and
5600 .gptab.sdata into .gptab.sdata, and likewise for
5601 .gptab.bss and .gptab.sbss. It is possible that there is
5602 no .sdata or .sbss section in the output file, in which
5603 case we must change the name of the output section. */
5606 {
5609 else
5613 }
5615 /* Set up the first entry. */
5624 /* Combine the input sections. */
5628 {
5631 bfd_size_type size;
5633 bfd_size_type gpentry;
5636 {
5640 }
5645 /* Combine the gptab entries for this input section one
5646 by one. We know that the input gptab entries are
5647 sorted by ascending -G value. */
5653 {
5654 Elf32_External_gptab ext_gptab;
5655 Elf32_gptab int_gptab;
5658 boolean exact;
5665 {
5668 }
5677 {
5683 }
5686 {
5690 /* We need a new table entry. */
5694 {
5697 }
5702 /* Merge in the size for the next smallest -G
5703 value, since that will be implied by this new
5704 value. */
5707 {
5713 }
5719 }
5722 }
5724 /* Hack: reset the SEC_HAS_CONTENTS flag so that
5725 elf_link_input_bfd ignores this section. */
5727 }
5729 /* The table must be sorted by -G value. */
5733 /* Swap out the table. */
5737 {
5740 }
5749 /* Skip this section later on (I don't think this currently
5750 matters, but someday it might). */
5752 }
5753 }
5755 /* Invoke the regular ELF backend linker to do all the work. */
5757 {
5758 #ifdef BFD64
5761 #else
5765 }
5769 /* Now write out the computed sections. */
5772 {
5773 Elf32_External_RegInfo ext;
5779 }
5782 {
5790 }
5793 {
5799 }
5802 {
5808 }
5811 {
5814 {
5820 }
5821 }
5824 }
5826 /* This function is called via qsort() to sort the dynamic relocation
5827 entries by increasing r_symndx value. */
5829 static int
5833 {
5837 Elf_Internal_Rel int_reloc1;
5838 Elf_Internal_Rel int_reloc2;
5844 }
5846 /* Returns the GOT section for ABFD. */
5851 {
5853 }
5855 /* Returns the GOT information associated with the link indicated by
5856 INFO. If SGOTP is non-NULL, it is filled in with the GOT
5857 section. */
5863 {
5876 }
5878 /* Return whether a relocation is against a local symbol. */
5880 static boolean
5882 check_forced)
5886 boolean check_forced;
5887 {
5903 {
5904 /* Look up the hash table to check whether the symbol
5905 was forced local. */
5908 /* Find the real hash-table entry for this symbol. */
5914 }
5917 }
5919 /* Sign-extend VALUE, which has the indicated number of BITS. */
5921 static bfd_vma
5923 bfd_vma value;
5925 {
5927 /* VALUE is negative. */
5931 }
5933 /* Return non-zero if the indicated VALUE has overflowed the maximum
5934 range expressable by a signed number with the indicated number of
5935 BITS. */
5937 static boolean
5939 bfd_vma value;
5941 {
5945 /* The value is too big. */
5948 /* The value is too small. */
5951 /* All is well. */
5953 }
5955 /* Calculate the %high function. */
5957 static bfd_vma
5959 bfd_vma value;
5960 {
5962 }
5964 /* Calculate the %higher function. */
5966 static bfd_vma
5968 bfd_vma value ATTRIBUTE_UNUSED;
5969 {
5970 #ifdef BFD64
5972 #else
5975 #endif
5976 }
5978 /* Calculate the %highest function. */
5980 static bfd_vma
5982 bfd_vma value ATTRIBUTE_UNUSED;
5983 {
5984 #ifdef BFD64
5986 #else
5989 #endif
5990 }
5992 /* Returns the GOT index for the global symbol indicated by H. */
5994 static bfd_vma
5998 {
5999 bfd_vma index;
6005 /* Once we determine the global GOT entry with the lowest dynamic
6006 symbol table index, we must put all dynamic symbols with greater
6007 indices into the GOT. That makes it easy to calculate the GOT
6008 offset. */
6015 }
6017 /* Returns the offset for the entry at the INDEXth position
6018 in the GOT. */
6020 static bfd_vma
6024 bfd_vma index;
6025 {
6027 bfd_vma gp;
6032 gp);
6033 }
6035 /* If H is a symbol that needs a global GOT entry, but has a dynamic
6036 symbol table index lower than any we've seen to date, record it for
6037 posterity. */
6039 static boolean
6044 {
6045 /* A global symbol in the GOT must also be in the dynamic symbol
6046 table. */
6051 /* If we've already marked this entry as needing GOT space, we don't
6052 need to do it again. */
6056 /* By setting this to a value other than -1, we are indicating that
6057 there needs to be a GOT entry for H. Avoid using zero, as the
6058 generic ELF copy_indirect_symbol tests for <= 0. */
6062 }
6064 /* This structure is passed to mips_elf_sort_hash_table_f when sorting
6065 the dynamic symbols. */
6067 struct mips_elf_hash_sort_data
6068 {
6069 /* The symbol in the global GOT with the lowest dynamic symbol table
6070 index. */
6072 /* The least dynamic symbol table index corresponding to a symbol
6073 with a GOT entry. */
6075 /* The greatest dynamic symbol table index not corresponding to a
6076 symbol without a GOT entry. */
6078 };
6080 /* If H needs a GOT entry, assign it the highest available dynamic
6081 index. Otherwise, assign it the lowest available dynamic
6082 index. */
6084 static boolean
6087 PTR data;
6088 {
6092 /* Symbols without dynamic symbol table entries aren't interesting
6093 at all. */
6099 else
6100 {
6103 }
6106 }
6108 /* Sort the dynamic symbol table so that symbols that need GOT entries
6109 appear towards the end. This reduces the amount of GOT space
6110 required. MAX_LOCAL is used to set the number of local symbols
6111 known to be in the dynamic symbol table. During
6112 mips_elf_size_dynamic_sections, this value is 1. Afterward, the
6113 section symbols are added and the count is higher. */
6115 static boolean
6119 {
6131 mips_elf_sort_hash_table_f,
6134 /* There should have been enough room in the symbol table to
6135 accomodate both the GOT and non-GOT symbols. */
6138 /* Now we know which dynamic symbol has the lowest dynamic symbol
6139 table index in the GOT. */
6144 }
6146 /* Create a local GOT entry for VALUE. Return the index of the entry,
6147 or -1 if it could not be created. */
6149 static bfd_vma
6154 bfd_vma value;
6155 {
6157 {
6158 /* We didn't allocate enough space in the GOT. */
6163 }
6169 }
6171 /* Returns the GOT offset at which the indicated address can be found.
6172 If there is not yet a GOT entry for this value, create one. Returns
6173 -1 if no satisfactory GOT offset can be found. */
6175 static bfd_vma
6179 bfd_vma value;
6180 {
6187 /* Look to see if we already have an appropriate entry. */
6192 {
6196 }
6199 }
6201 /* Find a GOT entry that is within 32KB of the VALUE. These entries
6202 are supposed to be placed at small offsets in the GOT, i.e.,
6203 within 32KB of GP. Return the index into the GOT for this page,
6204 and store the offset from this entry to the desired address in
6205 OFFSETP, if it is non-NULL. */
6207 static bfd_vma
6211 bfd_vma value;
6213 {
6219 bfd_vma address;
6223 /* Look to see if we aleady have an appropriate entry. */
6229 {
6233 {
6234 /* This entry will serve as the page pointer. We can add a
6235 16-bit number to it to get the actual address. */
6238 }
6239 }
6241 /* If we didn't have an appropriate entry, we create one now. */
6246 {
6249 }
6252 }
6254 /* Find a GOT entry whose higher-order 16 bits are the same as those
6255 for value. Return the index into the GOT for this entry. */
6257 static bfd_vma
6261 bfd_vma value;
6262 boolean external;
6263 {
6269 bfd_vma address;
6272 {
6273 /* Although the ABI says that it is "the high-order 16 bits" that we
6274 want, it is really the %high value. The complete value is
6275 calculated with a `addiu' of a LO16 relocation, just as with a
6276 HI16/LO16 pair. */
6278 }
6282 /* Look to see if we already have an appropriate entry. */
6288 {
6291 {
6292 /* This entry has the right high-order 16 bits, and the low-order
6293 16 bits are set to zero. */
6296 }
6297 }
6299 /* If we didn't have an appropriate entry, we create one now. */
6304 }
6306 /* Returns the first relocation of type r_type found, beginning with
6307 RELOCATION. RELEND is one-past-the-end of the relocation table. */
6314 {
6315 /* According to the MIPS ELF ABI, the R_MIPS_LO16 relocation must be
6316 immediately following. However, for the IRIX6 ABI, the next
6317 relocation may be a composed relocation consisting of several
6318 relocations for the same address. In that case, the R_MIPS_LO16
6319 relocation may occur as one of these. We permit a similar
6320 extension in general, as that is useful for GCC. */
6322 {
6327 }
6329 /* We didn't find it. */
6332 }
6334 /* Create a rel.dyn relocation for the dynamic linker to resolve. REL
6335 is the original relocation, which is now being transformed into a
6336 dynamic relocation. The ADDENDP is adjusted if necessary; the
6337 caller should store the result in place of the original addend. */
6339 static boolean
6347 bfd_vma symbol;
6350 {
6351 Elf_Internal_Rel outrel;
6352 boolean skip;
6359 sreloc
6373 /* If we've decided to skip this relocation, just output an empty
6374 record. Note that R_MIPS_NONE == 0, so that this call to memset
6375 is a way of setting R_TYPE to R_MIPS_NONE. */
6378 else
6379 {
6381 bfd_vma section_offset;
6383 /* We must now calculate the dynamic symbol table index to use
6384 in the relocation. */
6388 {
6390 /* h->root.dynindx may be -1 if this symbol was marked to
6391 become local. */
6394 }
6395 else
6396 {
6400 {
6403 }
6404 else
6405 {
6409 }
6411 /* Figure out how far the target of the relocation is from
6412 the beginning of its section. */
6414 /* The relocation we're building is section-relative.
6415 Therefore, the original addend must be adjusted by the
6416 section offset. */
6418 /* Now, the relocation is just against the section. */
6420 }
6422 /* If the relocation was previously an absolute relocation and
6423 this symbol will not be referred to by the relocation, we must
6424 adjust it by the value we give it in the dynamic symbol table.
6425 Otherwise leave the job up to the dynamic linker. */
6429 /* The relocation is always an REL32 relocation because we don't
6430 know where the shared library will wind up at load-time. */
6433 /* Adjust the output offset of the relocation to reference the
6434 correct location in the output file. */
6437 }
6439 /* Put the relocation back out. We have to use the special
6440 relocation outputter in the 64-bit case since the 64-bit
6441 relocation format is non-standard. */
6443 {
6448 }
6449 else
6455 /* Record the index of the first relocation referencing H. This
6456 information is later emitted in the .msym section. */
6462 /* We've now added another relocation. */
6465 /* Make sure the output section is writable. The dynamic linker
6466 will be writing to it. */
6470 /* On IRIX5, make an entry of compact relocation info. */
6472 {
6477 {
6478 Elf32_crinfo cptrel;
6486 else
6497 }
6498 }
6501 }
6503 /* Calculate the value produced by the RELOCATION (which comes from
6504 the INPUT_BFD). The ADDEND is the addend to use for this
6505 RELOCATION; RELOCATION->R_ADDEND is ignored.
6507 The result of the relocation calculation is stored in VALUEP.
6508 REQUIRE_JALXP indicates whether or not the opcode used with this
6509 relocation must be JALX.
6511 This function returns bfd_reloc_continue if the caller need take no
6512 further action regarding this relocation, bfd_reloc_notsupported if
6513 something goes dramatically wrong, bfd_reloc_overflow if an
6514 overflow occurs, and bfd_reloc_ok to indicate success. */
6516 static bfd_reloc_status_type
6518 input_bfd,
6519 input_section,
6520 info,
6521 relocation,
6522 addend,
6523 howto,
6524 local_syms,
6525 local_sections,
6526 valuep,
6527 namep,
6528 require_jalxp)
6534 bfd_vma addend;
6541 {
6542 /* The eventual value we will return. */
6543 bfd_vma value;
6544 /* The address of the symbol against which the relocation is
6545 occurring. */
6547 /* The final GP value to be used for the relocatable, executable, or
6548 shared object file being produced. */
6550 /* The place (section offset or address) of the storage unit being
6551 relocated. */
6552 bfd_vma p;
6553 /* The value of GP used to create the relocatable object. */
6555 /* The offset into the global offset table at which the address of
6556 the relocation entry symbol, adjusted by the addend, resides
6557 during execution. */
6559 /* The section in which the symbol referenced by the relocation is
6560 located. */
6563 /* True if the symbol referred to by this relocation is a local
6564 symbol. */
6565 boolean local_p;
6566 /* True if the symbol referred to by this relocation is "_gp_disp". */
6572 /* True if overflow occurred during the calculation of the
6573 relocation value. */
6574 boolean overflowed_p;
6575 /* True if this relocation refers to a MIPS16 function. */
6578 /* Parse the relocation. */
6585 /* Assume that there will be no overflow. */
6588 /* Figure out whether or not the symbol is local, and get the offset
6589 used in the array of hash table entries. */
6595 else
6596 {
6597 /* The symbol table does not follow the rule that local symbols
6598 must come before globals. */
6600 }
6602 /* Figure out the value of the symbol. */
6604 {
6614 /* MIPS16 text labels should be treated as odd. */
6618 /* Record the name of this symbol, for our caller. */
6626 }
6627 else
6628 {
6629 /* For global symbols we look up the symbol in the hash-table. */
6632 /* Find the real hash-table entry for this symbol. */
6637 /* Record the name of this symbol, for our caller. */
6640 /* See if this is the special _gp_disp symbol. Note that such a
6641 symbol must always be a global symbol. */
6643 {
6644 /* Relocations against _gp_disp are permitted only with
6645 R_MIPS_HI16 and R_MIPS_LO16 relocations. */
6650 }
6651 /* If this symbol is defined, calculate its address. Note that
6652 _gp_disp is a magic symbol, always implicitly defined by the
6653 linker, so it's inappropriate to check to see whether or not
6654 its defined. */
6658 {
6664 else
6666 }
6668 /* We allow relocations against undefined weak symbols, giving
6669 it the value zero, so that you can undefined weak functions
6670 and check to see if they exist by looking at their
6671 addresses. */
6680 {
6681 /* If this is a dynamic link, we should have created a
6682 _DYNAMIC_LINK symbol or _DYNAMIC_LINKING(for normal mips) symbol
6683 in in mips_elf_create_dynamic_sections.
6684 Otherwise, we should define the symbol with a value of 0.
6685 FIXME: It should probably get into the symbol table
6686 somehow as well. */
6690 }
6691 else
6692 {
6700 }
6703 }
6705 /* If this is a 32-bit call to a 16-bit function with a stub, we
6706 need to redirect the call to the stub, unless we're already *in*
6707 a stub. */
6713 {
6714 /* This is a 32-bit call to a 16-bit function. We should
6715 have already noticed that we were going to need the
6716 stub. */
6719 else
6720 {
6723 }
6726 }
6727 /* If this is a 16-bit call to a 32-bit function with a stub, we
6728 need to redirect the call to the stub. */
6733 {
6734 /* If both call_stub and call_fp_stub are defined, we can figure
6735 out which one to use by seeing which one appears in the input
6736 file. */
6738 {
6743 {
6746 {
6749 }
6750 }
6753 }
6756 else
6761 }
6763 /* Calls from 16-bit code to 32-bit code and vice versa require the
6764 special jalx instruction. */
6772 /* If we haven't already determined the GOT offset, or the GP value,
6773 and we're going to need it, get it now. */
6775 {
6783 /* Find the index into the GOT where this value is located. */
6785 {
6787 g = mips_elf_global_got_index
6794 {
6795 /* This is a static link or a -Bsymbolic link. The
6796 symbol is defined locally, or was forced to be local.
6797 We must initialize this entry in the GOT. */
6802 }
6803 }
6805 /* There's no need to create a local GOT entry here; the
6806 calculation for a local GOT16 entry does not involve G. */
6808 else
6809 {
6813 }
6815 /* Convert GOT indices to actual offsets. */
6832 }
6834 /* Figure out what kind of relocation is being performed. */
6836 {
6857 {
6858 /* If we're creating a shared library, or this relocation is
6859 against a symbol in a shared library, then we can't know
6860 where the symbol will end up. So, we create a relocation
6861 record in the output, and leave the job up to the dynamic
6862 linker. */
6865 info,
6866 relocation,
6867 h,
6868 sec,
6869 symbol,
6871 input_section))
6873 }
6874 else
6875 {
6878 else
6880 }
6898 /* Instead of subtracting 'p' here, we should be subtracting the
6899 equivalent value for the LO part of the reloc, since the value
6900 here is relative to that address. Because that's not easy to do,
6901 we adjust 'addend' in _bfd_mips_elf_relocate_section(). See also
6902 the comment there for more information. */
6908 /* The calculation for R_MIPS16_26 is just the same as for an
6909 R_MIPS_26. It's only the storage of the relocated field into
6910 the output file that's different. That's handled in
6911 mips_elf_perform_relocation. So, we just fall through to the
6912 R_MIPS_26 case here. */
6916 else
6923 {
6926 }
6927 else
6928 {
6931 }
6937 else
6938 {
6940 /* The MIPS ABI requires checking the R_MIPS_LO16 relocation
6941 for overflow. But, on, say, Irix 5, relocations against
6942 _gp_disp are normally generated from the .cpload
6943 pseudo-op. It generates code that normally looks like
6944 this:
6946 lui $gp,%hi(_gp_disp)
6947 addiu $gp,$gp,%lo(_gp_disp)
6948 addu $gp,$gp,$t9
6950 Here $t9 holds the address of the function being called,
6951 as required by the MIPS ELF ABI. The R_MIPS_LO16
6952 relocation can easily overflow in this situation, but the
6953 R_MIPS_HI16 relocation will handle the overflow.
6954 Therefore, we consider this a bug in the MIPS ABI, and do
6955 not check for overflow here. */
6956 }
6960 /* Because we don't merge literal sections, we can handle this
6961 just like R_MIPS_GPREL16. In the long run, we should merge
6962 shared literals, and then we will need to additional work
6963 here. */
6965 /* Fall through. */
6968 /* The R_MIPS16_GPREL performs the same calculation as
6969 R_MIPS_GPREL16, but stores the relocated bits in a different
6970 order. We don't need to do anything special here; the
6971 differences are handled in mips_elf_perform_relocation. */
6975 else
6983 {
6984 boolean forced;
6986 /* The special case is when the symbol is forced to be local. We
6987 need the full address in the GOT since no R_MIPS_LO16 relocation
6988 follows. */
6994 value
6996 abfd,
6997 value);
7000 }
7002 /* Fall through. */
7021 /* We're allowed to handle these two relocations identically.
7022 The dynamic linker is allowed to handle the CALL relocations
7023 differently by creating a lazy evaluation stub. */
7039 abfd,
7040 value);
7071 /* Both of these may be ignored. R_MIPS_JALR is an optimization
7072 hint; we could improve performance by honoring that hint. */
7077 /* We don't do anything with these at present. */
7081 /* An unrecognized relocation type. */
7083 }
7085 /* Store the VALUE for our caller. */
7088 }
7090 /* Obtain the field relocated by RELOCATION. */
7092 static bfd_vma
7098 {
7099 bfd_vma x;
7102 /* Obtain the bytes. */
7108 /* The two 16-bit words will be reversed on a little-endian
7109 system. See mips_elf_perform_relocation for more details. */
7113 }
7115 /* It has been determined that the result of the RELOCATION is the
7116 VALUE. Use HOWTO to place VALUE into the output file at the
7117 appropriate position. The SECTION is the section to which the
7118 relocation applies. If REQUIRE_JALX is true, then the opcode used
7119 for the relocation must be either JAL or JALX, and it is
7120 unconditionally converted to JALX.
7122 Returns false if anything goes wrong. */
7124 static boolean
7131 bfd_vma value;
7135 boolean require_jalx;
7136 {
7137 bfd_vma x;
7141 /* Figure out where the relocation is occurring. */
7144 /* Obtain the current value. */
7147 /* Clear the field we are setting. */
7150 /* If this is the R_MIPS16_26 relocation, we must store the
7151 value in a funny way. */
7153 {
7154 /* R_MIPS16_26 is used for the mips16 jal and jalx instructions.
7155 Most mips16 instructions are 16 bits, but these instructions
7156 are 32 bits.
7158 The format of these instructions is:
7160 +--------------+--------------------------------+
7161 ! JALX ! X! Imm 20:16 ! Imm 25:21 !
7162 +--------------+--------------------------------+
7163 ! Immediate 15:0 !
7164 +-----------------------------------------------+
7166 JALX is the 5-bit value 00011. X is 0 for jal, 1 for jalx.
7167 Note that the immediate value in the first word is swapped.
7169 When producing a relocateable object file, R_MIPS16_26 is
7170 handled mostly like R_MIPS_26. In particular, the addend is
7171 stored as a straight 26-bit value in a 32-bit instruction.
7172 (gas makes life simpler for itself by never adjusting a
7173 R_MIPS16_26 reloc to be against a section, so the addend is
7174 always zero). However, the 32 bit instruction is stored as 2
7175 16-bit values, rather than a single 32-bit value. In a
7176 big-endian file, the result is the same; in a little-endian
7177 file, the two 16-bit halves of the 32 bit value are swapped.
7178 This is so that a disassembler can recognize the jal
7179 instruction.
7181 When doing a final link, R_MIPS16_26 is treated as a 32 bit
7182 instruction stored as two 16-bit values. The addend A is the
7183 contents of the targ26 field. The calculation is the same as
7184 R_MIPS_26. When storing the calculated value, reorder the
7185 immediate value as shown above, and don't forget to store the
7186 value as two 16-bit values.
7188 To put it in MIPS ABI terms, the relocation field is T-targ26-16,
7189 defined as
7191 big-endian:
7192 +--------+----------------------+
7193 | | |
7194 | | targ26-16 |
7195 |31 26|25 0|
7196 +--------+----------------------+
7198 little-endian:
7199 +----------+------+-------------+
7200 | | | |
7201 | sub1 | | sub2 |
7202 |0 9|10 15|16 31|
7203 +----------+--------------------+
7204 where targ26-16 is sub1 followed by sub2 (i.e., the addend field A is
7205 ((sub1 << 16) | sub2)).
7207 When producing a relocateable object file, the calculation is
7208 (((A < 2) | ((P + 4) & 0xf0000000) + S) >> 2)
7209 When producing a fully linked file, the calculation is
7210 let R = (((A < 2) | ((P + 4) & 0xf0000000) + S) >> 2)
7211 ((R & 0x1f0000) << 5) | ((R & 0x3e00000) >> 5) | (R & 0xffff) */
7214 /* Shuffle the bits according to the formula above. */
7218 }
7220 {
7221 /* R_MIPS16_GPREL is used for GP-relative addressing in mips16
7222 mode. A typical instruction will have a format like this:
7224 +--------------+--------------------------------+
7225 ! EXTEND ! Imm 10:5 ! Imm 15:11 !
7226 +--------------+--------------------------------+
7227 ! Major ! rx ! ry ! Imm 4:0 !
7228 +--------------+--------------------------------+
7230 EXTEND is the five bit value 11110. Major is the instruction
7231 opcode.
7233 This is handled exactly like R_MIPS_GPREL16, except that the
7234 addend is retrieved and stored as shown in this diagram; that
7235 is, the Imm fields above replace the V-rel16 field.
7237 All we need to do here is shuffle the bits appropriately. As
7238 above, the two 16-bit halves must be swapped on a
7239 little-endian system. */
7243 }
7245 /* Set the field. */
7248 /* If required, turn JAL into JALX. */
7250 {
7251 boolean ok;
7253 bfd_vma jalx_opcode;
7255 /* Check to see if the opcode is already JAL or JALX. */
7257 {
7260 }
7261 else
7262 {
7265 }
7267 /* If the opcode is not JAL or JALX, there's a problem. */
7269 {
7277 }
7279 /* Make this the JALX opcode. */
7281 }
7283 /* Swap the high- and low-order 16 bits on little-endian systems
7284 when doing a MIPS16 relocation. */
7289 /* Put the value into the output. */
7292 }
7294 /* Returns true if SECTION is a MIPS16 stub section. */
7296 static boolean
7300 {
7306 }
7308 /* Relocate a MIPS ELF section. */
7310 boolean
7321 {
7331 {
7333 bfd_vma value;
7335 boolean require_jalx;
7336 /* True if the relocation is a RELA relocation, rather than a
7337 REL relocation. */
7342 /* Find the relocation howto for this relocation. */
7344 {
7345 /* Some 32-bit code uses R_MIPS_64. In particular, people use
7346 64-bit code, but make sure all their addresses are in the
7347 lowermost or uppermost 32-bit section of the 64-bit address
7348 space. Thus, when they use an R_MIPS_64 they mean what is
7349 usually meant by R_MIPS_32, with the exception that the
7350 stored value is sign-extended to 64 bits. */
7353 /* On big-endian systems, we need to lie about the position
7354 of the reloc. */
7357 }
7358 else
7362 {
7365 /* If these relocations were originally of the REL variety,
7366 we must pull the addend out of the field that will be
7367 relocated. Otherwise, we simply use the contents of the
7368 RELA relocation. To determine which flavor or relocation
7369 this is, we depend on the fact that the INPUT_SECTION's
7370 REL_HDR is read before its REL_HDR2. */
7376 {
7377 /* Note that this is a REL relocation. */
7380 /* Get the addend, which is stored in the input file. */
7382 rel,
7383 input_bfd,
7384 contents);
7387 /* For some kinds of relocations, the ADDEND is a
7388 combination of the addend stored in two different
7389 relocations. */
7395 {
7396 bfd_vma l;
7401 /* The combined value is the sum of the HI16 addend,
7402 left-shifted by sixteen bits, and the LO16
7403 addend, sign extended. (Usually, the code does
7404 a `lui' of the HI16 value, and then an `addiu' of
7405 the LO16 value.)
7407 Scan ahead to find a matching LO16 relocation. */
7410 else
7412 lo16_relocation
7417 /* Obtain the addend kept there. */
7420 lo16_relocation,
7427 /* Compute the combined addend. */
7430 /* If PC-relative, subtract the difference between the
7431 address of the LO part of the reloc and the address of
7432 the HI part. The relocation is relative to the LO
7433 part, but mips_elf_calculate_relocation() doesn't know
7434 it address or the difference from the HI part, so
7435 we subtract that difference here. See also the
7436 comment in mips_elf_calculate_relocation(). */
7439 }
7441 {
7442 /* The addend is scrambled in the object file. See
7443 mips_elf_perform_relocation for details on the
7444 format. */
7448 }
7449 }
7450 else
7452 }
7455 {
7463 /* Since we're just relocating, all we need to do is copy
7464 the relocations back out to the object file, unless
7465 they're against a section symbol, in which case we need
7466 to adjust by the section offset, or unless they're GP
7467 relative in which case we need to adjust by the amount
7468 that we're adjusting GP in this relocateable object. */
7472 /* There's nothing to do for non-local relocations. */
7483 /* The addend is stored without its two least
7484 significant bits (which are always zero.) In a
7485 non-relocateable link, calculate_relocation will do
7486 this shift; here, we must do it ourselves. */
7492 /* Adjust the addend appropriately. */
7495 /* If the relocation is for a R_MIPS_HI16 or R_MIPS_GOT16,
7496 then we only want to write out the high-order 16 bits.
7497 The subsequent R_MIPS_LO16 will handle the low-order bits. */
7501 /* If the relocation is for an R_MIPS_26 relocation, then
7502 the two low-order bits are not stored in the object file;
7503 they are implicitly zero. */
7509 /* If this is a RELA relocation, just update the addend.
7510 We have to cast away constness for REL. */
7512 else
7513 {
7514 /* Otherwise, we have to write the value back out. Note
7515 that we use the source mask, rather than the
7516 destination mask because the place to which we are
7517 writing will be source of the addend in the final
7518 link. */
7522 /* See the comment above about using R_MIPS_64 in the 32-bit
7523 ABI. Here, we need to update the addend. It would be
7524 possible to get away with just using the R_MIPS_32 reloc
7525 but for endianness. */
7526 {
7527 bfd_vma sign_bits;
7528 bfd_vma low_bits;
7529 bfd_vma high_bits;
7532 #ifdef BFD64
7534 #else
7536 #endif
7537 else
7540 /* If we don't know that we have a 64-bit type,
7541 do two separate stores. */
7543 {
7544 /* Store the sign-bits (which are most significant)
7545 first. */
7548 }
7549 else
7550 {
7553 }
7559 }
7565 }
7567 /* Go on to the next relocation. */
7569 }
7571 /* In the N32 and 64-bit ABIs there may be multiple consecutive
7572 relocations for the same offset. In that case we are
7573 supposed to treat the output of each relocation as the addend
7574 for the next. */
7579 else
7582 /* Figure out what value we are supposed to relocate. */
7584 input_bfd,
7585 input_section,
7586 info,
7587 rel,
7588 addend,
7589 howto,
7590 local_syms,
7591 local_sections,
7595 {
7597 /* There's nothing to do. */
7601 /* mips_elf_calculate_relocation already called the
7602 undefined_symbol callback. There's no real point in
7603 trying to perform the relocation at this point, so we
7604 just skip ahead to the next relocation. */
7615 /* Ignore overflow until we reach the last relocation for
7616 a given location. */
7617 ;
7618 else
7619 {
7625 }
7634 }
7636 /* If we've got another relocation for the address, keep going
7637 until we reach the last one. */
7639 {
7642 }
7645 /* See the comment above about using R_MIPS_64 in the 32-bit
7646 ABI. Until now, we've been using the HOWTO for R_MIPS_32;
7647 that calculated the right value. Now, however, we
7648 sign-extend the 32-bit result to 64-bits, and store it as a
7649 64-bit value. We are especially generous here in that we
7650 go to extreme lengths to support this usage on systems with
7651 only a 32-bit VMA. */
7652 {
7653 bfd_vma sign_bits;
7654 bfd_vma low_bits;
7655 bfd_vma high_bits;
7658 #ifdef BFD64
7660 #else
7662 #endif
7663 else
7666 /* If we don't know that we have a 64-bit type,
7667 do two separate stores. */
7669 {
7670 /* Undo what we did above. */
7672 /* Store the sign-bits (which are most significant)
7673 first. */
7676 }
7677 else
7678 {
7681 }
7687 }
7689 /* Actually perform the relocation. */
7692 require_jalx))
7694 }
7697 }
7699 /* This hook function is called before the linker writes out a global
7700 symbol. We mark symbols as small common if appropriate. This is
7701 also where we undo the increment of the value for a mips16 symbol. */
7703 boolean
7710 {
7711 /* If we see a common symbol, which implies a relocatable link, then
7712 if a symbol was small common in an input file, mark it as small
7713 common in the output file. */
7723 }
7724 \f
7725 /* Functions for the dynamic linker. */
7727 /* The name of the dynamic interpreter. This is put in the .interp
7728 section. */
7730 #define ELF_DYNAMIC_INTERPRETER(abfd) \
7735 /* Create dynamic sections when linking against a dynamic object. */
7737 boolean
7741 {
7743 flagword flags;
7750 /* Mips ABI requests the .dynamic section to be read only. */
7753 {
7756 }
7758 /* We need to create .got section. */
7762 /* Create the .msym section on IRIX6. It is used by the dynamic
7763 linker to speed up dynamic relocations, and to avoid computing
7764 the ELF hash for symbols. */
7769 /* Create .stub section. */
7772 {
7779 }
7784 {
7791 }
7793 /* On IRIX5, we adjust add some additional symbols and change the
7794 alignments of several sections. There is no ABI documentation
7795 indicating that this is necessary on IRIX6, nor any evidence that
7796 the linker takes such action. */
7798 {
7800 {
7814 }
7816 /* We need to create a .compact_rel section. */
7818 {
7821 }
7823 /* Change aligments of some sections. */
7839 }
7842 {
7845 {
7852 }
7853 else
7854 {
7855 /* For normal mips it is _DYNAMIC_LINKING. */
7862 }
7871 {
7872 /* __rld_map is a four byte word located in the .data section
7873 and is filled in by the rtld to contain a pointer to
7874 the _r_debug structure. Its symbol value will be set in
7875 mips_elf_finish_dynamic_symbol. */
7881 {
7888 }
7889 else
7890 {
7891 /* For normal mips the symbol is __RLD_MAP. */
7898 }
7905 }
7906 }
7909 }
7911 /* Create the .compact_rel section. */
7913 static boolean
7917 {
7918 flagword flags;
7922 {
7934 }
7937 }
7939 /* Create the .got section to hold the global offset table. */
7941 static boolean
7945 {
7946 flagword flags;
7950 bfd_size_type amt;
7952 /* This function may be called more than once. */
7965 /* Define the symbol _GLOBAL_OFFSET_TABLE_. We don't do this in the
7966 linker script because we don't want to define the symbol if we
7967 are not creating a global offset table. */
7983 /* The first several global offset table entries are reserved. */
7994 {
7999 }
8005 }
8007 /* Returns the .msym section for ABFD, creating it if it does not
8008 already exist. Returns NULL to indicate error. */
8013 {
8018 {
8022 SEC_ALLOC
8023 | SEC_LOAD
8024 | SEC_HAS_CONTENTS
8025 | SEC_LINKER_CREATED
8030 }
8033 }
8035 /* Add room for N relocations to the .rel.dyn section in ABFD. */
8037 static void
8041 {
8048 {
8049 /* Make room for a null element. */
8052 }
8054 }
8056 /* Look through the relocs for a section during the first phase, and
8057 allocate space in the global offset table. */
8059 boolean
8065 {
8086 /* Check for the mips16 stub sections. */
8090 {
8093 /* Look at the relocation information to figure out which symbol
8094 this is for. */
8100 {
8103 /* This stub is for a local symbol. This stub will only be
8104 needed if there is some relocation in this BFD, other
8105 than a 16 bit function call, which refers to this symbol. */
8107 {
8111 /* We can ignore stub sections when looking for relocs. */
8122 sec_relocs = (_bfd_elf32_link_read_relocs
8140 }
8143 {
8144 /* There is no non-call reloc for this stub, so we do
8145 not need it. Since this function is called before
8146 the linker maps input sections to output sections, we
8147 can easily discard it by setting the SEC_EXCLUDE
8148 flag. */
8151 }
8153 /* Record this stub in an array of local symbol stubs for
8154 this BFD. */
8156 {
8159 bfd_size_type amt;
8163 else
8170 }
8174 /* We don't need to set mips16_stubs_seen in this case.
8175 That flag is used to see whether we need to look through
8176 the global symbol table for stubs. We don't need to set
8177 it here, because we just have a local stub. */
8178 }
8179 else
8180 {
8186 /* H is the symbol this stub is for. */
8190 }
8191 }
8194 {
8199 /* Look at the relocation information to figure out which symbol
8200 this is for. */
8206 {
8207 /* This stub was actually built for a static symbol defined
8208 in the same file. We assume that all static symbols in
8209 mips16 code are themselves mips16, so we can simply
8210 discard this stub. Since this function is called before
8211 the linker maps input sections to output sections, we can
8212 easily discard it by setting the SEC_EXCLUDE flag. */
8215 }
8220 /* H is the symbol this stub is for. */
8224 else
8227 /* If we already have an appropriate stub for this function, we
8228 don't need another one, so we can discard this one. Since
8229 this function is called before the linker maps input sections
8230 to output sections, we can easily discard it by setting the
8231 SEC_EXCLUDE flag. We can also discard this section if we
8232 happen to already know that this is a mips16 function; it is
8233 not necessary to check this here, as it is checked later, but
8234 it is slightly faster to check now. */
8236 {
8239 }
8243 }
8246 {
8249 }
8250 else
8251 {
8255 else
8256 {
8260 }
8261 }
8267 {
8278 {
8284 }
8285 else
8286 {
8289 /* This may be an indirect symbol created because of a version. */
8291 {
8294 }
8295 }
8297 /* Some relocs require a global offset table. */
8299 {
8301 {
8329 }
8330 }
8335 {
8336 /* We may need a local GOT entry for this relocation. We
8337 don't count R_MIPS_GOT_PAGE because we can estimate the
8338 maximum number of pages needed by looking at the size of
8339 the segment. Similar comments apply to R_MIPS_GOT16 and
8340 R_MIPS_CALL16. We don't count R_MIPS_GOT_HI16, or
8341 R_MIPS_CALL_HI16 because these are always followed by an
8342 R_MIPS_GOT_LO16 or R_MIPS_CALL_LO16.
8344 This estimation is very conservative since we can merge
8345 duplicate entries in the GOT. In order to be less
8346 conservative, we could actually build the GOT here,
8347 rather than in relocate_section. */
8350 }
8353 {
8356 {
8362 }
8363 /* Fall through. */
8368 {
8369 /* This symbol requires a global offset table entry. */
8373 /* We need a stub, not a plt entry for the undefined
8374 function. But we record it as if it needs plt. See
8375 elf_adjust_dynamic_symbol in elflink.h. */
8378 }
8385 /* This symbol requires a global offset table entry. */
8395 {
8397 {
8402 {
8406 (SEC_ALLOC
8407 | SEC_LOAD
8408 | SEC_HAS_CONTENTS
8409 | SEC_IN_MEMORY
8410 | SEC_LINKER_CREATED
8415 }
8416 }
8417 #define MIPS_READONLY_SECTION (SEC_ALLOC | SEC_LOAD | SEC_READONLY)
8419 {
8420 /* When creating a shared object, we must copy these
8421 reloc types into the output file as R_MIPS_REL32
8422 relocs. We make room for this reloc in the
8423 .rel.dyn reloc section. */
8427 /* We tell the dynamic linker that there are
8428 relocations against the text segment. */
8430 }
8431 else
8432 {
8435 /* We only need to copy this reloc if the symbol is
8436 defined in a dynamic object. */
8441 /* We need it to tell the dynamic linker if there
8442 are relocations against the text segment. */
8444 }
8446 /* Even though we don't directly need a GOT entry for
8447 this symbol, a symbol must have a dynamic symbol
8448 table index greater that DT_MIPS_GOTSYM if there are
8449 dynamic relocations against it. */
8453 }
8469 /* This relocation describes the C++ object vtable hierarchy.
8470 Reconstruct it for later use during GC. */
8476 /* This relocation describes which C++ vtable entries are actually
8477 used. Record for later use during GC. */
8485 }
8487 /* We must not create a stub for a symbol that has relocations
8488 related to taking the function's address. */
8490 {
8493 {
8498 }
8504 }
8506 /* If this reloc is not a 16 bit call, and it has a global
8507 symbol, then we will need the fn_stub if there is one.
8508 References from a stub section do not count. */
8517 {
8522 }
8523 }
8526 }
8528 /* Return the section that should be marked against GC for a given
8529 relocation. */
8531 asection *
8538 {
8539 /* ??? Do mips16 stub sections need to be handled special? */
8542 {
8544 {
8551 {
8561 }
8562 }
8563 }
8564 else
8565 {
8567 }
8570 }
8572 /* Update the got entry reference counts for the section being removed. */
8574 boolean
8580 {
8581 #if 0
8596 {
8603 /* ??? It would seem that the existing MIPS code does no sort
8604 of reference counting or whatnot on its GOT and PLT entries,
8605 so it is not possible to garbage collect them at this time. */
8610 }
8611 #endif
8614 }
8616 /* Copy data from a MIPS ELF indirect symbol to its direct symbol,
8617 hiding the old indirect symbol. Process additional relocation
8618 information. Also called for weakdefs, in which case we just let
8619 _bfd_elf_link_hash_copy_indirect copy the flags for us. */
8621 static void
8624 {
8643 }
8645 /* Adjust a symbol defined by a dynamic object and referenced by a
8646 regular object. The current definition is in some section of the
8647 dynamic object, but we're not including those sections. We have to
8648 change the definition to something the rest of the link can
8649 understand. */
8651 boolean
8655 {
8662 /* Make sure we know what is going on here. */
8673 /* If this symbol is defined in a dynamic object, we need to copy
8674 any R_MIPS_32 or R_MIPS_REL32 relocs against it into the output
8675 file. */
8682 {
8686 /* We tell the dynamic linker that there are relocations
8687 against the text segment. */
8689 }
8691 /* For a function, create a stub, if allowed. */
8694 {
8698 /* If this symbol is not defined in a regular file, then set
8699 the symbol to the stub location. This is required to make
8700 function pointers compare as equal between the normal
8701 executable and the shared library. */
8703 {
8704 /* We need .stub section. */
8712 /* XXX Write this stub address somewhere. */
8715 /* Make room for this stub code. */
8718 /* The last half word of the stub will be filled with the index
8719 of this symbol in .dynsym section. */
8721 }
8722 }
8725 {
8726 /* This will set the entry for this symbol in the GOT to 0, and
8727 the dynamic linker will take care of this. */
8730 }
8732 /* If this is a weak symbol, and there is a real definition, the
8733 processor independent code will have arranged for us to see the
8734 real definition first, and we can just use the same value. */
8736 {
8742 }
8744 /* This is a reference to a symbol defined by a dynamic object which
8745 is not a function. */
8748 }
8750 /* This function is called after all the input files have been read,
8751 and the input sections have been assigned to output sections. We
8752 check for any mips16 stub sections that we can discard. */
8754 static boolean mips_elf_check_mips16_stubs
8757 boolean
8761 {
8764 /* The .reginfo section has a fixed size. */
8775 mips_elf_check_mips16_stubs,
8779 }
8781 /* Check the mips16 stubs for a particular symbol, and see if we can
8782 discard them. */
8784 static boolean
8787 PTR data ATTRIBUTE_UNUSED;
8788 {
8791 {
8792 /* We don't need the fn_stub; the only references to this symbol
8793 are 16 bit calls. Clobber the size to 0 to prevent it from
8794 being included in the link. */
8800 }
8804 {
8805 /* We don't need the call_stub; this is a 16 bit function, so
8806 calls from other 16 bit functions are OK. Clobber the size
8807 to 0 to prevent it from being included in the link. */
8813 }
8817 {
8818 /* We don't need the call_stub; this is a 16 bit function, so
8819 calls from other 16 bit functions are OK. Clobber the size
8820 to 0 to prevent it from being included in the link. */
8826 }
8829 }
8831 /* Set the sizes of the dynamic sections. */
8833 boolean
8837 {
8840 boolean reltext;
8847 {
8848 /* Set the contents of the .interp section to the interpreter. */
8850 {
8853 s->_raw_size
8855 s->contents
8857 }
8858 }
8860 /* The check_relocs and adjust_dynamic_symbol entry points have
8861 determined the sizes of the various dynamic sections. Allocate
8862 memory for them. */
8865 {
8867 boolean strip;
8869 /* It's OK to base decisions on the section name, because none
8870 of the dynobj section names depend upon the input files. */
8879 {
8881 {
8882 /* We only strip the section if the output section name
8883 has the same name. Otherwise, there might be several
8884 input sections for this output section. FIXME: This
8885 code is probably not needed these days anyhow, since
8886 the linker now does not create empty output sections. */
8892 }
8893 else
8894 {
8898 /* If this relocation section applies to a read only
8899 section, then we probably need a DT_TEXTREL entry.
8900 If the relocation section is .rel.dyn, we always
8901 assert a DT_TEXTREL entry rather than testing whether
8902 there exists a relocation to a read only section or
8903 not. */
8914 /* We use the reloc_count field as a counter if we need
8915 to copy relocs into the output file. */
8919 }
8920 }
8922 {
8925 bfd_size_type local_gotno;
8932 /* Calculate the total loadable size of the output. That
8933 will give us the maximum number of GOT_PAGE entries
8934 required. */
8936 {
8940 subsection;
8942 {
8947 }
8948 }
8951 /* Assume there are two loadable segments consisting of
8952 contiguous sections. Is 5 enough? */
8955 /* It's possible we will need GOT_PAGE entries as well as
8956 GOT16 entries. Often, these will be able to share GOT
8957 entries, but not always. */
8963 /* There has to be a global GOT entry for every symbol with
8964 a dynamic symbol table index of DT_MIPS_GOTSYM or
8965 higher. Therefore, it make sense to put those symbols
8966 that need GOT entries at the end of the symbol table. We
8967 do that here. */
8973 else
8974 /* If there are no global symbols, or none requiring
8975 relocations, then GLOBAL_GOTSYM will be NULL. */
8979 }
8981 {
8982 /* Irix rld assumes that the function stub isn't at the end
8983 of .text section. So put a dummy. XXX */
8985 }
8989 {
8990 /* We add a room for __rld_map. It will be filled in by the
8991 rtld to contain a pointer to the _r_debug structure. */
8993 }
9003 {
9004 /* It's not one of our sections, so don't allocate space. */
9006 }
9009 {
9012 }
9014 /* Allocate memory for the section contents. */
9017 {
9020 }
9021 }
9024 {
9025 /* Add some entries to the .dynamic section. We fill in the
9026 values later, in elf_mips_finish_dynamic_sections, but we
9027 must add the entries now so that we get the correct size for
9028 the .dynamic section. The DT_DEBUG entry is filled in by the
9029 dynamic linker and used by the debugger. */
9031 {
9032 /* SGI object has the equivalence of DT_DEBUG in the
9033 DT_MIPS_RLD_MAP entry. */
9037 {
9040 }
9041 }
9042 else
9043 {
9044 /* Shared libraries on traditional mips have DT_DEBUG. */
9046 {
9049 }
9050 }
9056 {
9059 }
9066 {
9075 }
9078 {
9081 }
9084 {
9087 }
9090 {
9099 }
9107 #if 0
9108 /* Time stamps in executable files are a bad idea. */
9111 #endif
9116 #endif
9121 #endif
9143 && (bfd_get_section_by_name
9152 }
9155 }
9157 /* If NAME is one of the special IRIX6 symbols defined by the linker,
9158 adjust it appropriately now. */
9160 static void
9165 {
9166 /* The linker script takes care of providing names and values for
9167 these, but we must place them into the right sections. */
9174 NULL
9175 };
9182 NULL
9183 };
9193 {
9194 /* All of these symbols are given type STT_SECTION by the
9195 IRIX6 linker. */
9198 /* The IRIX linker puts these symbols in special sections. */
9201 else
9205 }
9206 }
9208 /* Finish up dynamic symbol handling. We set the contents of various
9209 dynamic sections here. */
9211 boolean
9217 {
9219 bfd_vma gval;
9231 {
9236 /* This symbol has a stub. Set it up. */
9244 /* Fill the stub. */
9251 /* FIXME: Can h->dynindex be more than 64K? */
9262 /* Mark the symbol as undefined. plt.offset != -1 occurs
9263 only for the referenced symbol. */
9266 /* The run-time linker uses the st_value field of the symbol
9267 to reset the global offset table entry for this external
9268 to its stub address when unlinking a shared object. */
9271 }
9282 /* Run through the global symbol table, creating GOT entries for all
9283 the symbols that need them. */
9286 {
9287 bfd_vma offset;
9288 bfd_vma value;
9292 else
9293 {
9294 /* For an entity defined in a shared object, this will be
9295 NULL. (For functions in shared objects for
9296 which we have created stubs, ST_VALUE will be non-NULL.
9297 That's because such the functions are now no longer defined
9298 in a shared object.) */
9302 else
9304 }
9307 }
9309 /* Create a .msym entry, if appropriate. */
9313 {
9314 Elf32_Internal_Msym msym;
9317 /* It is undocumented what the `1' indicates, but IRIX6 uses
9318 this value. */
9320 bfd_mips_elf_swap_msym_out
9323 }
9325 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
9332 {
9336 }
9338 {
9342 }
9344 {
9347 {
9352 }
9354 {
9359 }
9361 {
9366 }
9367 }
9369 /* Handle the IRIX6-specific symbols. */
9374 {
9378 {
9385 }
9388 {
9389 /* IRIX6 does not use a .rld_map section. */
9395 }
9396 }
9398 /* If this is a mips16 symbol, force the value to be even. */
9404 }
9406 /* Finish up the dynamic sections. */
9408 boolean
9412 {
9425 else
9426 {
9430 }
9433 {
9442 {
9443 Elf_Internal_Dyn dyn;
9447 boolean swap_out_p;
9449 /* Read in the current dynamic entry. */
9452 /* Assume that we're going to modify it and write it out. */
9456 {
9458 s = (bfd_get_section_by_name
9466 /* Rewrite DT_STRSZ. */
9479 get_vma:
9501 set_elemno:
9504 {
9507 else
9509 }
9510 else
9519 /* XXX FIXME: */
9524 /* XXX FIXME: */
9539 /* The index into the dynamic symbol table which is the
9540 entry of the first external symbol that is not
9541 referenced within the same object. */
9547 {
9550 }
9551 /* In case if we don't have global got symbols we default
9552 to setting DT_MIPS_GOTSYM to the same value as
9553 DT_MIPS_SYMTABNO, so we just fall through. */
9563 else
9576 s = (bfd_get_section_by_name
9582 s = (bfd_get_section_by_name
9590 }
9595 }
9596 }
9598 /* The first entry of the global offset table will be filled at
9599 runtime. The second entry will be used by some runtime loaders.
9600 This isn't the case of Irix rld. */
9602 {
9606 }
9612 {
9615 Elf32_compact_rel cpt;
9617 /* ??? The section symbols for the output sections were set up in
9618 _bfd_elf_final_link. SGI sets the STT_NOTYPE attribute for these
9619 symbols. Should we do so? */
9624 {
9625 Elf32_Internal_Msym msym;
9631 {
9634 bfd_mips_elf_swap_msym_out
9638 }
9639 }
9642 {
9643 /* Write .compact_rel section out. */
9646 {
9658 /* Clean up a dummy stub function entry in .text. */
9662 {
9663 file_ptr dummy_offset;
9668 MIPS_FUNCTION_STUB_SIZE);
9669 }
9670 }
9671 }
9673 /* We need to sort the entries of the dynamic relocation section. */
9676 {
9682 {
9687 }
9688 }
9690 /* Clean up a first relocation in .rel.dyn. */
9695 }
9698 }
9699 \f
9700 /* Support for core dump NOTE sections */
9701 static boolean
9705 {
9710 {
9715 /* pr_cursig */
9718 /* pr_pid */
9721 /* pr_reg */
9726 }
9728 /* Make a ".reg/999" section. */
9731 }
9733 static boolean
9737 {
9739 {
9748 }
9750 /* Note that for some reason, a spurious space is tacked
9751 onto the end of the args in some (at least one anyway)
9752 implementations, so strip it off if it exists. */
9754 {
9760 }
9763 }
9764 \f
9765 #define PDR_SIZE 32
9767 static boolean
9772 {
9798 {
9801 }
9808 {
9810 {
9812 skip ++;
9813 }
9814 }
9817 {
9821 }
9822 else
9829 }
9831 static boolean
9834 {
9838 }
9840 static boolean
9845 {
9860 {
9866 }
9871 }
9872 \f
9873 /* Given a data section and an in-memory embedded reloc section, store
9874 relocation information into the embedded reloc section which can be
9875 used at runtime to relocate the data section. This is called by the
9876 linker when the --embedded-relocs switch is used. This is called
9877 after the add_symbols entry point has been called for all the
9878 objects, and before the final_link entry point is called. */
9880 boolean
9887 {
9897 bfd_size_type amt;
9907 /* Read this BFD's symbols if we haven't done so already, or get the cached
9908 copy if it exists. */
9911 else
9912 {
9913 /* Go get them off disk. */
9917 else
9930 }
9934 {
9942 }
9944 /* Get a copy of the native relocations. */
9945 internal_relocs = (_bfd_elf32_link_read_relocs
9962 {
9965 /* We are going to write a four byte longword into the runtime
9966 reloc section. The longword will be the address in the data
9967 section which must be relocated. It is followed by the name
9968 of the target section NUL-padded or truncated to 8
9969 characters. */
9971 /* We can only relocate absolute longword relocs at run time. */
9974 {
9978 }
9979 /* Get the target section referred to by the reloc. */
9981 {
9984 Elf_Internal_Sym isym;
9986 /* A local symbol. */
9992 }
9993 else
9994 {
9998 /* An external symbol. */
10002 /*
10003 * For some reason, in certain programs, the symbol will
10004 * not be in the hash table. It seems to happen when you
10005 * declare a static table of pointers to const external structures.
10006 * In this case, the relocs are relative to data, not
10007 * text, so just treating it like an undefined link
10008 * should be sufficient.
10009 */
10014 }
10017 /*
10018 * Set the low bit of the relocation offset if it's a MIPS64 reloc.
10019 * Relocations will always be on (at least) 32-bit boundaries.
10020 */
10024 p);
10028 }
10038 error_return:
10046 }
10047 \f
10048 /* This is almost identical to bfd_generic_get_... except that some
10049 MIPS relocations need to be handled specially. Sigh. */
10058 boolean relocateable;
10060 {
10061 /* Get enough memory to hold the stuff */
10076 /* read in the section */
10078 input_section,
10084 /* We're not relaxing the section, so just copy the size info */
10089 input_section,
10090 reloc_vector,
10091 symbols);
10096 {
10098 /* for mips */
10102 {
10105 /* Skip all this stuff if we aren't mixing formats. */
10109 else
10110 {
10113 }
10114 lookup:
10116 {
10118 {
10132 /* @@FIXME ignoring warning for now */
10137 }
10138 }
10139 else
10141 }
10142 /* end mips */
10144 parent++)
10145 {
10147 bfd_reloc_status_type r;
10149 /* Specific to MIPS: Deal with relocation types that require
10150 knowing the gp of the output bfd. */
10153 {
10154 /* The special_function wouldn't get called anyways. */
10155 }
10157 {
10158 /* The gp isn't there; let the special function code
10159 fall over on its own. */
10160 }
10163 {
10164 /* bypass special_function call */
10168 }
10169 /* end mips specific stuff */
10174 input_section,
10177 skip_bfd_perform_relocation:
10180 {
10183 /* A partial link, so keep the relocs */
10186 }
10189 {
10191 {
10217 }
10219 }
10220 }
10221 }
10226 error_return:
10230 }
10232 #define bfd_elf32_bfd_get_relocated_section_contents \
10233 elf32_mips_get_relocated_section_contents
10234 \f
10235 /* ECOFF swapping routines. These are used when dealing with the
10236 .mdebug section, which is in the ECOFF debugging format. */
10238 /* Symbol table magic number. */
10239 magicSym,
10240 /* Alignment of debugging information. E.g., 4. */
10242 /* Sizes of external symbolic information. */
10251 /* Functions to swap in external symbolic data. */
10252 ecoff_swap_hdr_in,
10253 ecoff_swap_dnr_in,
10254 ecoff_swap_pdr_in,
10255 ecoff_swap_sym_in,
10256 ecoff_swap_opt_in,
10257 ecoff_swap_fdr_in,
10258 ecoff_swap_rfd_in,
10259 ecoff_swap_ext_in,
10260 _bfd_ecoff_swap_tir_in,
10261 _bfd_ecoff_swap_rndx_in,
10262 /* Functions to swap out external symbolic data. */
10263 ecoff_swap_hdr_out,
10264 ecoff_swap_dnr_out,
10265 ecoff_swap_pdr_out,
10266 ecoff_swap_sym_out,
10267 ecoff_swap_opt_out,
10268 ecoff_swap_fdr_out,
10269 ecoff_swap_rfd_out,
10270 ecoff_swap_ext_out,
10271 _bfd_ecoff_swap_tir_out,
10272 _bfd_ecoff_swap_rndx_out,
10273 /* Function to read in symbolic data. */
10274 _bfd_mips_elf_read_ecoff_info
10275 };
10276 \f
10277 #define ELF_ARCH bfd_arch_mips
10278 #define ELF_MACHINE_CODE EM_MIPS
10280 /* The SVR4 MIPS ABI says that this should be 0x10000, but Irix 5 uses
10281 a value of 0x1000, and we are compatible. */
10282 #define ELF_MAXPAGESIZE 0x1000
10284 #define elf_backend_collect true
10285 #define elf_backend_type_change_ok true
10286 #define elf_backend_can_gc_sections true
10287 #define elf_info_to_howto mips_info_to_howto_rela
10288 #define elf_info_to_howto_rel mips_info_to_howto_rel
10289 #define elf_backend_sym_is_global mips_elf_sym_is_global
10290 #define elf_backend_object_p _bfd_mips_elf_object_p
10291 #define elf_backend_symbol_processing _bfd_mips_elf_symbol_processing
10292 #define elf_backend_section_processing _bfd_mips_elf_section_processing
10293 #define elf_backend_section_from_shdr _bfd_mips_elf_section_from_shdr
10294 #define elf_backend_fake_sections _bfd_mips_elf_fake_sections
10295 #define elf_backend_section_from_bfd_section \
10296 _bfd_mips_elf_section_from_bfd_section
10297 #define elf_backend_add_symbol_hook _bfd_mips_elf_add_symbol_hook
10298 #define elf_backend_link_output_symbol_hook \
10299 _bfd_mips_elf_link_output_symbol_hook
10300 #define elf_backend_create_dynamic_sections \
10301 _bfd_mips_elf_create_dynamic_sections
10302 #define elf_backend_check_relocs _bfd_mips_elf_check_relocs
10303 #define elf_backend_adjust_dynamic_symbol \
10304 _bfd_mips_elf_adjust_dynamic_symbol
10305 #define elf_backend_always_size_sections \
10306 _bfd_mips_elf_always_size_sections
10307 #define elf_backend_size_dynamic_sections \
10308 _bfd_mips_elf_size_dynamic_sections
10309 #define elf_backend_relocate_section _bfd_mips_elf_relocate_section
10310 #define elf_backend_finish_dynamic_symbol \
10311 _bfd_mips_elf_finish_dynamic_symbol
10312 #define elf_backend_finish_dynamic_sections \
10313 _bfd_mips_elf_finish_dynamic_sections
10314 #define elf_backend_final_write_processing \
10315 _bfd_mips_elf_final_write_processing
10316 #define elf_backend_additional_program_headers \
10317 _bfd_mips_elf_additional_program_headers
10318 #define elf_backend_modify_segment_map _bfd_mips_elf_modify_segment_map
10319 #define elf_backend_gc_mark_hook _bfd_mips_elf_gc_mark_hook
10320 #define elf_backend_gc_sweep_hook _bfd_mips_elf_gc_sweep_hook
10321 #define elf_backend_copy_indirect_symbol \
10322 _bfd_mips_elf_copy_indirect_symbol
10323 #define elf_backend_hide_symbol _bfd_mips_elf_hide_symbol
10324 #define elf_backend_grok_prstatus _bfd_elf32_mips_grok_prstatus
10325 #define elf_backend_grok_psinfo _bfd_elf32_mips_grok_psinfo
10326 #define elf_backend_ecoff_debug_swap &mips_elf32_ecoff_debug_swap
10328 #define elf_backend_got_header_size (4 * MIPS_RESERVED_GOTNO)
10329 #define elf_backend_plt_header_size 0
10330 #define elf_backend_may_use_rel_p 1
10331 #define elf_backend_may_use_rela_p 0
10332 #define elf_backend_default_use_rela_p 0
10333 #define elf_backend_sign_extend_vma true
10335 #define elf_backend_discard_info _bfd_elf32_mips_discard_info
10336 #define elf_backend_ignore_discarded_relocs \
10337 _bfd_elf32_mips_ignore_discarded_relocs
10338 #define elf_backend_write_section _bfd_elf32_mips_write_section
10340 #define bfd_elf32_bfd_is_local_label_name \
10341 mips_elf_is_local_label_name
10342 #define bfd_elf32_find_nearest_line _bfd_mips_elf_find_nearest_line
10343 #define bfd_elf32_set_section_contents _bfd_mips_elf_set_section_contents
10344 #define bfd_elf32_bfd_link_hash_table_create \
10345 _bfd_mips_elf_link_hash_table_create
10346 #define bfd_elf32_bfd_final_link _bfd_mips_elf_final_link
10347 #define bfd_elf32_bfd_merge_private_bfd_data \
10348 _bfd_mips_elf_merge_private_bfd_data
10349 #define bfd_elf32_bfd_set_private_flags _bfd_mips_elf_set_private_flags
10350 #define bfd_elf32_bfd_print_private_bfd_data \
10351 _bfd_mips_elf_print_private_bfd_data
10353 /* Support for SGI-ish mips targets. */
10354 #define TARGET_LITTLE_SYM bfd_elf32_littlemips_vec
10356 #define TARGET_BIG_SYM bfd_elf32_bigmips_vec
10361 /* Support for traditional mips targets. */
10364 #undef TARGET_LITTLE_SYM
10365 #undef TARGET_LITTLE_NAME
10366 #undef TARGET_BIG_SYM
10367 #undef TARGET_BIG_NAME
10369 #define TARGET_LITTLE_SYM bfd_elf32_tradlittlemips_vec
10371 #define TARGET_BIG_SYM bfd_elf32_tradbigmips_vec
10374 /* Include the target file again for this target */