| blob | 1d86b483061cc67e1fcd083f07ebae811b26c2b5 |
1 /* PowerPC-specific support for 32-bit ELF
2 Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
3 2004, 2005 Free Software Foundation, Inc.
4 Written by Ian Lance Taylor, Cygnus Support.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the
20 Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
21 Boston, MA 02110-1301, USA. */
23 /* This file is based on a preliminary PowerPC ELF ABI. The
24 information may not match the final PowerPC ELF ABI. It includes
25 suggestions from the in-progress Embedded PowerPC ABI, and that
26 information may also not match. */
36 /* RELA relocations are used here. */
38 static bfd_reloc_status_type ppc_elf_addr16_ha_reloc
40 static bfd_reloc_status_type ppc_elf_unhandled_reloc
43 /* Branch prediction bit for branch taken relocs. */
44 #define BRANCH_PREDICT_BIT 0x200000
45 /* Mask to set RA in memory instructions. */
46 #define RA_REGISTER_MASK 0x001f0000
47 /* Value to shift register by to insert RA. */
48 #define RA_REGISTER_SHIFT 16
50 /* The name of the dynamic interpreter. This is put in the .interp
51 section. */
54 /* For old-style PLT. */
55 /* The size in bytes of an entry in the procedure linkage table. */
56 #define PLT_ENTRY_SIZE 12
57 /* The initial size of the plt reserved for the dynamic linker. */
58 #define PLT_INITIAL_ENTRY_SIZE 72
59 /* The size of the gap between entries in the PLT. */
60 #define PLT_SLOT_SIZE 8
61 /* The number of single-slot PLT entries (the rest use two slots). */
62 #define PLT_NUM_SINGLE_ENTRIES 8192
64 /* For new-style .glink and .plt. */
65 #define GLINK_PLTRESOLVE 16*4
66 #define GLINK_ENTRY_SIZE 4*4
68 /* Some instructions. */
69 #define ADDIS_11_11 0x3d6b0000
70 #define ADDIS_11_30 0x3d7e0000
71 #define ADDIS_12_12 0x3d8c0000
72 #define ADDI_11_11 0x396b0000
73 #define ADD_0_11_11 0x7c0b5a14
74 #define ADD_11_0_11 0x7d605a14
75 #define B 0x48000000
76 #define BCL_20_31 0x429f0005
77 #define BCTR 0x4e800420
78 #define LIS_11 0x3d600000
79 #define LIS_12 0x3d800000
80 #define LWZU_0_12 0x840c0000
81 #define LWZ_0_12 0x800c0000
82 #define LWZ_11_11 0x816b0000
83 #define LWZ_11_30 0x817e0000
84 #define LWZ_12_12 0x818c0000
85 #define MFLR_0 0x7c0802a6
86 #define MFLR_12 0x7d8802a6
87 #define MTCTR_0 0x7c0903a6
88 #define MTCTR_11 0x7d6903a6
89 #define MTLR_0 0x7c0803a6
90 #define NOP 0x60000000
91 #define SUB_11_11_12 0x7d6c5850
93 /* Offset of tp and dtp pointers from start of TLS block. */
94 #define TP_OFFSET 0x7000
95 #define DTP_OFFSET 0x8000
96 \f
100 /* This reloc does nothing. */
115 /* A standard 32 bit relocation. */
130 /* An absolute 26 bit branch; the lower two bits must be zero.
131 FIXME: we don't check that, we just clear them. */
146 /* A standard 16 bit relocation. */
161 /* A 16 bit relocation without overflow. */
176 /* The high order 16 bits of an address. */
191 /* The high order 16 bits of an address, plus 1 if the contents of
192 the low 16 bits, treated as a signed number, is negative. */
207 /* An absolute 16 bit branch; the lower two bits must be zero.
208 FIXME: we don't check that, we just clear them. */
223 /* An absolute 16 bit branch, for which bit 10 should be set to
224 indicate that the branch is expected to be taken. The lower two
225 bits must be zero. */
240 /* An absolute 16 bit branch, for which bit 10 should be set to
241 indicate that the branch is not expected to be taken. The lower
242 two bits must be zero. */
257 /* A relative 26 bit branch; the lower two bits must be zero. */
272 /* A relative 16 bit branch; the lower two bits must be zero. */
287 /* A relative 16 bit branch. Bit 10 should be set to indicate that
288 the branch is expected to be taken. The lower two bits must be
289 zero. */
304 /* A relative 16 bit branch. Bit 10 should be set to indicate that
305 the branch is not expected to be taken. The lower two bits must
306 be zero. */
321 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the
322 symbol. */
337 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
338 the symbol. */
353 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
354 the symbol. */
369 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
370 the symbol. */
385 /* Like R_PPC_REL24, but referring to the procedure linkage table
386 entry for the symbol. */
401 /* This is used only by the dynamic linker. The symbol should exist
402 both in the object being run and in some shared library. The
403 dynamic linker copies the data addressed by the symbol from the
404 shared library into the object, because the object being
405 run has to have the data at some particular address. */
420 /* Like R_PPC_ADDR32, but used when setting global offset table
421 entries. */
436 /* Marks a procedure linkage table entry for a symbol. */
451 /* Used only by the dynamic linker. When the object is run, this
452 longword is set to the load address of the object, plus the
453 addend. */
468 /* Like R_PPC_REL24, but uses the value of the symbol within the
469 object rather than the final value. Normally used for
470 _GLOBAL_OFFSET_TABLE_. */
485 /* Like R_PPC_ADDR32, but may be unaligned. */
500 /* Like R_PPC_ADDR16, but may be unaligned. */
515 /* 32-bit PC relative */
530 /* 32-bit relocation to the symbol's procedure linkage table.
531 FIXME: not supported. */
546 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
547 FIXME: not supported. */
562 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
563 the symbol. */
578 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
579 the symbol. */
594 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
595 the symbol. */
610 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
611 small data items. */
626 /* 16-bit section relative relocation. */
641 /* 16-bit lower half section relative relocation. */
656 /* 16-bit upper half section relative relocation. */
671 /* 16-bit upper half adjusted section relative relocation. */
686 /* Marker reloc for TLS. */
701 /* Computes the load module index of the load module that contains the
702 definition of its TLS sym. */
717 /* Computes a dtv-relative displacement, the difference between the value
718 of sym+add and the base address of the thread-local storage block that
719 contains the definition of sym, minus 0x8000. */
734 /* A 16 bit dtprel reloc. */
749 /* Like DTPREL16, but no overflow. */
764 /* Like DTPREL16_LO, but next higher group of 16 bits. */
779 /* Like DTPREL16_HI, but adjust for low 16 bits. */
794 /* Computes a tp-relative displacement, the difference between the value of
795 sym+add and the value of the thread pointer (r13). */
810 /* A 16 bit tprel reloc. */
825 /* Like TPREL16, but no overflow. */
840 /* Like TPREL16_LO, but next higher group of 16 bits. */
855 /* Like TPREL16_HI, but adjust for low 16 bits. */
870 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
871 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset
872 to the first entry. */
887 /* Like GOT_TLSGD16, but no overflow. */
902 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */
917 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */
932 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
933 with values (sym+add)@dtpmod and zero, and computes the offset to the
934 first entry. */
949 /* Like GOT_TLSLD16, but no overflow. */
964 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */
979 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */
994 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes
995 the offset to the entry. */
1010 /* Like GOT_DTPREL16, but no overflow. */
1025 /* Like GOT_DTPREL16_LO, but next higher group of 16 bits. */
1040 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */
1055 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the
1056 offset to the entry. */
1071 /* Like GOT_TPREL16, but no overflow. */
1086 /* Like GOT_TPREL16_LO, but next higher group of 16 bits. */
1101 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */
1116 /* The remaining relocs are from the Embedded ELF ABI, and are not
1117 in the SVR4 ELF ABI. */
1119 /* 32 bit value resulting from the addend minus the symbol. */
1134 /* 16 bit value resulting from the addend minus the symbol. */
1149 /* 16 bit value resulting from the addend minus the symbol. */
1164 /* The high order 16 bits of the addend minus the symbol. */
1179 /* The high order 16 bits of the result of the addend minus the address,
1180 plus 1 if the contents of the low 16 bits, treated as a signed number,
1181 is negative. */
1196 /* 16 bit value resulting from allocating a 4 byte word to hold an
1197 address in the .sdata section, and returning the offset from
1198 _SDA_BASE_ for that relocation. */
1213 /* 16 bit value resulting from allocating a 4 byte word to hold an
1214 address in the .sdata2 section, and returning the offset from
1215 _SDA2_BASE_ for that relocation. */
1230 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
1231 small data items. */
1246 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
1247 signed offset from the appropriate base, and filling in the register
1248 field with the appropriate register (0, 2, or 13). */
1263 /* Relocation not handled: R_PPC_EMB_MRKREF */
1264 /* Relocation not handled: R_PPC_EMB_RELSEC16 */
1265 /* Relocation not handled: R_PPC_EMB_RELST_LO */
1266 /* Relocation not handled: R_PPC_EMB_RELST_HI */
1267 /* Relocation not handled: R_PPC_EMB_RELST_HA */
1268 /* Relocation not handled: R_PPC_EMB_BIT_FLD */
1270 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
1271 in the 16 bit signed offset from the appropriate base, and filling in the
1272 register field with the appropriate register (0, 2, or 13). */
1287 /* A 16 bit relative relocation. */
1302 /* A 16 bit relative relocation without overflow. */
1317 /* The high order 16 bits of a relative address. */
1332 /* The high order 16 bits of a relative address, plus 1 if the contents of
1333 the low 16 bits, treated as a signed number, is negative. */
1348 /* GNU extension to record C++ vtable hierarchy. */
1363 /* GNU extension to record C++ vtable member usage. */
1378 /* Phony reloc to handle AIX style TOC entries. */
1392 };
1393 \f
1394 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
1396 static void
1398 {
1403 i++)
1404 {
1410 }
1411 }
1415 bfd_reloc_code_real_type code)
1416 {
1419 /* Initialize howto table if not already done. */
1424 {
1513 }
1516 };
1518 /* Set the howto pointer for a PowerPC ELF reloc. */
1520 static void
1524 {
1525 /* Initialize howto table if not already done. */
1531 }
1533 /* Handle the R_PPC_ADDR16_HA and R_PPC_REL16_HA relocs. */
1535 static bfd_reloc_status_type
1543 {
1544 bfd_vma relocation;
1547 {
1550 }
1557 else
1569 }
1571 static bfd_reloc_status_type
1579 {
1580 /* If this is a relocatable link (output_bfd test tells us), just
1581 call the generic function. Any adjustment will be done at final
1582 link time. */
1588 {
1593 }
1595 }
1596 \f
1597 /* Sections created by the linker. */
1600 {
1601 /* Pointer to the bfd section. */
1603 /* Section name. */
1605 /* Associated bss section name. */
1607 /* Associated symbol name. */
1609 /* Value of symbol. */
1610 bfd_vma sym_val;
1613 /* Linked list of allocated pointer entries. This hangs off of the
1614 symbol lists, and provides allows us to return different pointers,
1615 based on different addend's. */
1618 {
1619 /* next allocated pointer for this symbol */
1621 /* offset of pointer from beginning of section */
1622 bfd_vma offset;
1623 /* addend used */
1624 bfd_vma addend;
1625 /* which linker section this is */
1629 struct ppc_elf_obj_tdata
1630 {
1633 /* A mapping from local symbols to offsets into the various linker
1634 sections added. This is index by the symbol index. */
1636 };
1638 #define ppc_elf_tdata(bfd) \
1639 ((struct ppc_elf_obj_tdata *) (bfd)->tdata.any)
1641 #define elf_local_ptr_offsets(bfd) \
1642 (ppc_elf_tdata (bfd)->linker_section_pointers)
1644 /* Override the generic function because we store some extras. */
1646 static bfd_boolean
1648 {
1654 }
1656 /* Fix bad default arch selected for a 32 bit input bfd when the
1657 default is 64 bit. */
1659 static bfd_boolean
1661 {
1663 {
1667 {
1668 /* Relies on arch after 64 bit default being 32 bit default. */
1671 }
1672 }
1674 }
1676 /* Function to set whether a module needs the -mrelocatable bit set. */
1678 static bfd_boolean
1680 {
1687 }
1689 /* Support for core dump NOTE sections. */
1691 static bfd_boolean
1693 {
1698 {
1703 /* pr_cursig */
1706 /* pr_pid */
1709 /* pr_reg */
1714 }
1716 /* Make a ".reg/999" section. */
1719 }
1721 static bfd_boolean
1723 {
1725 {
1734 }
1736 /* Note that for some reason, a spurious space is tacked
1737 onto the end of the args in some (at least one anyway)
1738 implementations, so strip it off if it exists. */
1740 {
1746 }
1749 }
1751 /* Return address for Ith PLT stub in section PLT, for relocation REL
1752 or (bfd_vma) -1 if it should not be included. */
1754 static bfd_vma
1758 {
1760 }
1762 /* Handle a PowerPC specific section when reading an object file. This
1763 is called when bfd_section_from_shdr finds a section with an unknown
1764 type. */
1766 static bfd_boolean
1771 {
1773 flagword flags;
1788 }
1790 /* Set up any other section flags and such that may be necessary. */
1792 static bfd_boolean
1796 {
1804 }
1806 /* If we have .sbss2 or .PPC.EMB.sbss0 output sections, we
1807 need to bump up the number of section headers. */
1809 static int
1811 {
1824 }
1826 /* Add extra PPC sections -- Note, for now, make .sbss2 and
1827 .PPC.EMB.sbss0 a normal section, and not a bss section so
1828 that the linker doesn't crater when trying to make more than
1829 2 sections. */
1832 ppc_special_sections_p[] =
1833 {
1836 };
1839 ppc_special_sections_s[] =
1840 {
1846 };
1849 ppc_special_sections_t[] =
1850 {
1853 };
1856 ppc_special_sections_other[]=
1857 {
1862 };
1866 {
1894 };
1895 \f
1896 /* Very simple linked list structure for recording apuinfo values. */
1898 {
1901 }
1902 apuinfo_list;
1907 static void
1909 {
1911 }
1913 static void
1915 {
1919 {
1923 }
1932 }
1934 static unsigned
1936 {
1941 entry;
1946 }
1950 {
1956 ;
1959 }
1961 static void
1963 {
1967 {
1971 }
1974 }
1979 /* Scan the input BFDs and create a linked list of
1980 the APUinfo values that will need to be emitted. */
1982 static void
1984 {
1989 bfd_size_type output_section_size;
1999 /* Scan the input bfds, looking for apuinfo sections. */
2004 {
2007 {
2010 }
2011 }
2013 /* We need at least one input sections
2014 in order to make merging worthwhile. */
2018 /* Just make sure that the output section exists as well. */
2023 /* Allocate a buffer for the contents of the input sections. */
2031 /* Read in the input sections contents. */
2033 {
2043 {
2046 }
2050 {
2053 }
2055 /* Process the contents of the section. */
2059 /* Verify the contents of the header. Note - we have to
2060 extract the values this way in order to allow for a
2061 host whose endian-ness is different from the target. */
2073 /* Get the number of bytes used for apuinfo entries. */
2078 /* Make sure that we do not run off the end of the section. */
2082 /* Scan the apuinfo section, building a list of apuinfo numbers. */
2086 /* Update the offset. */
2088 }
2092 /* Compute the size of the output section. */
2102 fail:
2107 }
2109 /* Prevent the output section from accumulating the input sections'
2110 contents. We have already stored this in our linked list structure. */
2112 static bfd_boolean
2116 {
2119 }
2121 /* Finally we can generate the output section. */
2123 static void
2125 {
2130 bfd_size_type length;
2145 {
2149 }
2151 /* Create the apuinfo header. */
2160 {
2163 }
2174 }
2175 \f
2176 /* The following functions are specific to the ELF linker, while
2177 functions above are used generally. They appear in this file more
2178 or less in the order in which they are called. eg.
2179 ppc_elf_check_relocs is called early in the link process,
2180 ppc_elf_finish_dynamic_sections is one of the last functions
2181 called. */
2183 /* The PPC linker needs to keep track of the number of relocs that it
2184 decides to copy as dynamic relocs in check_relocs for each symbol.
2185 This is so that it can later discard them if they are found to be
2186 unnecessary. We store the information in a field extending the
2187 regular ELF linker hash table. */
2189 struct ppc_elf_dyn_relocs
2190 {
2193 /* The input section of the reloc. */
2196 /* Total number of relocs copied for the input section. */
2197 bfd_size_type count;
2199 /* Number of pc-relative relocs copied for the input section. */
2200 bfd_size_type pc_count;
2201 };
2203 /* Track PLT entries needed for a given symbol. We might need more
2204 than one glink entry per symbol. */
2205 struct plt_entry
2206 {
2209 /* -fPIC uses multiple GOT sections, one per file, called ".got2".
2210 This field stores the offset into .got2 used to initialise the
2211 GOT pointer reg. It will always be at least 32768 (and for
2212 current gcc this is the only offset used). */
2213 bfd_vma addend;
2215 /* The .got2 section. */
2218 /* PLT refcount or offset. */
2219 union
2220 {
2221 bfd_signed_vma refcount;
2222 bfd_vma offset;
2225 /* .glink stub offset. */
2226 bfd_vma glink_offset;
2227 };
2229 /* Of those relocs that might be copied as dynamic relocs, this macro
2230 selects those that must be copied when linking a shared library,
2231 even when the symbol is local. */
2233 #define MUST_BE_DYN_RELOC(RTYPE) \
2234 ((RTYPE) != R_PPC_REL24 \
2235 && (RTYPE) != R_PPC_REL14 \
2236 && (RTYPE) != R_PPC_REL14_BRTAKEN \
2237 && (RTYPE) != R_PPC_REL14_BRNTAKEN \
2238 && (RTYPE) != R_PPC_REL32)
2240 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
2241 copying dynamic variables from a shared lib into an app's dynbss
2242 section, and instead use a dynamic relocation to point into the
2243 shared lib. */
2244 #define ELIMINATE_COPY_RELOCS 1
2246 /* PPC ELF linker hash entry. */
2248 struct ppc_elf_link_hash_entry
2249 {
2252 /* If this symbol is used in the linker created sections, the processor
2253 specific backend uses this field to map the field into the offset
2254 from the beginning of the section. */
2257 /* Track dynamic relocs copied for this symbol. */
2260 /* Contexts in which symbol is used in the GOT (or TOC).
2261 TLS_GD .. TLS_TLS bits are or'd into the mask as the
2262 corresponding relocs are encountered during check_relocs.
2263 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
2264 indicate the corresponding GOT entry type is not needed. */
2273 /* Nonzero if we have seen a small data relocation referring to this
2274 symbol. */
2276 };
2278 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent))
2280 /* PPC ELF linker hash table. */
2282 struct ppc_elf_link_hash_table
2283 {
2286 /* Short-cuts to get to dynamic linker sections. */
2299 /* Shortcut to .__tls_get_addr. */
2302 /* TLS local dynamic got entry handling. */
2304 bfd_signed_vma refcount;
2305 bfd_vma offset;
2308 /* Offset of PltResolve function in glink. */
2309 bfd_vma glink_pltresolve;
2311 /* Size of reserved GOT entries. */
2313 /* Non-zero if allocating the header left a gap. */
2316 /* Whether to use new plt/got layout or not. */
2320 /* Small local sym to section mapping cache. */
2322 };
2324 /* Get the PPC ELF linker hash table from a link_info structure. */
2326 #define ppc_elf_hash_table(p) \
2327 ((struct ppc_elf_link_hash_table *) (p)->hash)
2329 /* Create an entry in a PPC ELF linker hash table. */
2335 {
2336 /* Allocate the structure if it has not already been allocated by a
2337 subclass. */
2339 {
2344 }
2346 /* Call the allocation method of the superclass. */
2349 {
2353 }
2356 }
2358 /* Create a PPC ELF linker hash table. */
2362 {
2370 ppc_elf_link_hash_newfunc))
2371 {
2374 }
2390 }
2392 /* The powerpc .got has a blrl instruction in it. Mark it executable. */
2394 static bfd_boolean
2396 {
2399 flagword flags;
2422 }
2424 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2425 to output sections (just like _bfd_elf_create_dynamic_sections has
2426 to create .dynbss and .rela.bss). */
2428 static bfd_boolean
2430 {
2433 flagword flags;
2461 {
2468 }
2477 }
2479 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2481 static void
2485 {
2487 bfd_signed_vma tmp;
2493 {
2495 {
2502 /* Add reloc counts against the weak sym to the strong sym
2503 list. Merge any entries against the same section. */
2505 {
2510 {
2515 }
2518 }
2520 }
2524 }
2529 /* If called to transfer flags for a weakdef during processing
2530 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
2531 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
2542 /* If we were called to copy over info for a weak sym, that's all. */
2546 /* Copy over the GOT refcount entries that we may have already seen to
2547 the symbol which just became indirect. */
2550 {
2553 }
2554 else
2557 /* And plt entries. */
2559 {
2561 {
2566 {
2571 {
2575 }
2578 }
2580 }
2584 }
2587 {
2592 }
2593 else
2595 }
2597 /* Return 1 if target is one of ours. */
2599 static bfd_boolean
2601 {
2606 }
2608 /* Hook called by the linker routine which adds symbols from an object
2609 file. We use it to put .comm items in .sbss, and not .bss. */
2611 static bfd_boolean
2619 {
2624 {
2625 /* Common symbols less than or equal to -G nn bytes are automatically
2626 put into .sbss. */
2631 {
2639 flags);
2642 }
2646 }
2649 }
2650 \f
2651 /* Create a special linker section. */
2653 static bfd_boolean
2656 flagword flags,
2658 {
2665 /* Record the first bfd that needs the special sections. */
2671 flags);
2678 }
2680 /* Find a linker generated pointer with a given addend and type. */
2683 elf_find_pointer_linker_section
2685 bfd_vma addend,
2687 {
2693 }
2695 /* Allocate a pointer to live in a linker created section. */
2697 static bfd_boolean
2702 {
2706 bfd_size_type amt;
2710 /* Is this a global symbol? */
2712 {
2715 /* Has this symbol already been allocated? If so, our work is done. */
2719 lsect))
2723 }
2724 else
2725 {
2726 /* Allocation of a pointer to a local symbol. */
2729 /* Allocate a table to hold the local symbols if first time. */
2731 {
2742 }
2744 /* Has this symbol already been allocated? If so, our work is done. */
2747 lsect))
2751 }
2753 /* Allocate space for a pointer in the linker section, and allocate
2754 a new pointer record from internal memory. */
2770 #ifdef DEBUG
2775 #endif
2778 }
2780 static bfd_boolean
2785 {
2790 {
2798 }
2804 }
2806 static bfd_boolean
2809 {
2818 {
2828 }
2831 }
2835 {
2844 }
2846 static void
2848 {
2851 abfd,
2854 }
2856 /* Look through the relocs for a section during the first phase, and
2857 allocate space in the global offset table or procedure linkage
2858 table. */
2860 static bfd_boolean
2865 {
2876 /* Don't do anything special with non-loaded, non-alloced sections.
2877 In particular, any relocs in such sections should not affect GOT
2878 and PLT reference counting (ie. we don't allow them to create GOT
2879 or PLT entries), there's no possibility or desire to optimize TLS
2880 relocs, and there's not much point in propagating relocs to shared
2881 libs that the dynamic linker won't relocate. */
2885 #ifdef DEBUG
2888 #endif
2890 /* Initialize howto table if not already done. */
2902 {
2911 else
2912 {
2917 }
2919 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
2920 This shows up in particular in an R_PPC_ADDR32 in the eabi
2921 startup code. */
2925 {
2931 }
2935 {
2965 dogottls:
2967 /* Fall thru */
2969 /* GOT16 relocations */
2974 /* This symbol requires a global offset table entry. */
2976 {
2981 }
2983 {
2986 }
2987 else
2988 /* This is a global offset table entry for a local symbol. */
2993 /* Indirect .sdata relocation. */
2996 {
2999 }
3009 /* Indirect .sdata2 relocation. */
3012 {
3015 }
3035 {
3038 }
3040 {
3042 /* We may need a copy reloc. */
3044 }
3053 #ifdef DEBUG
3055 #endif
3056 /* This symbol requires a procedure linkage table entry. We
3057 actually build the entry in finish_dynamic_symbol,
3058 because this might be a case of linking PIC code without
3059 linking in any dynamic objects, in which case we don't
3060 need to generate a procedure linkage table after all. */
3063 {
3064 /* It does not make sense to have a procedure linkage
3065 table entry for a local symbol. */
3068 abfd,
3069 sec,
3074 }
3075 else
3076 {
3082 }
3085 /* The following relocations don't need to propagate the
3086 relocation if linking a shared object since they are
3087 section relative. */
3106 /* These are just markers. */
3113 /* These should only appear in dynamic objects. */
3120 /* These aren't handled yet. We'll report an error later. */
3129 /* This refers only to functions defined in the shared library. */
3135 /* This relocation describes the C++ object vtable hierarchy.
3136 Reconstruct it for later use during GC. */
3142 /* This relocation describes which C++ vtable entries are actually
3143 used. Record for later use during GC. */
3149 /* We shouldn't really be seeing these. */
3155 /* Nor these. */
3174 {
3175 /* Old -fPIC gcc code has .long LCTOC1-LCFx just before
3176 the start of a function, which assembles to a REL32
3177 reference to .got2. If we detect one of these, then
3178 force the old PLT layout because the linker cannot
3179 reliably deduce the GOT pointer value needed for
3180 PLT call stubs. */
3184 r_symndx);
3187 }
3188 /* fall through */
3197 {
3200 }
3201 /* fall through */
3215 {
3216 /* We may need a plt entry if the symbol turns out to be
3217 a function defined in a dynamic object. */
3221 /* We may need a copy reloc too. */
3223 }
3225 dodyn:
3226 /* If we are creating a shared library, and this is a reloc
3227 against a global symbol, or a non PC relative reloc
3228 against a local symbol, then we need to copy the reloc
3229 into the shared library. However, if we are linking with
3230 -Bsymbolic, we do not need to copy a reloc against a
3231 global symbol which is defined in an object we are
3232 including in the link (i.e., DEF_REGULAR is set). At
3233 this point we have not seen all the input files, so it is
3234 possible that DEF_REGULAR is not set now but will be set
3235 later (it is never cleared). In case of a weak definition,
3236 DEF_REGULAR may be cleared later by a strong definition in
3237 a shared library. We account for that possibility below by
3238 storing information in the dyn_relocs field of the hash
3239 table entry. A similar situation occurs when creating
3240 shared libraries and symbol visibility changes render the
3241 symbol local.
3243 If on the other hand, we are creating an executable, we
3244 may need to keep relocations for symbols satisfied by a
3245 dynamic library if we manage to avoid copy relocs for the
3246 symbol. */
3253 || (ELIMINATE_COPY_RELOCS
3258 {
3262 #ifdef DEBUG
3264 "ppc_elf_check_relocs needs to "
3268 #endif
3270 {
3273 name = (bfd_elf_string_from_elf_section
3288 {
3289 flagword flags;
3295 name,
3296 flags);
3301 }
3303 }
3305 /* If this is a global symbol, we count the number of
3306 relocations we need for this symbol. */
3308 {
3310 }
3311 else
3312 {
3313 /* Track dynamic relocs needed for local syms too.
3314 We really need local syms available to do this
3315 easily. Oh well. */
3325 }
3329 {
3338 }
3343 }
3346 }
3347 }
3350 }
3351 \f
3352 /* Merge backend specific data from an object file to the output
3353 object file when linking. */
3355 static bfd_boolean
3357 {
3358 flagword old_flags;
3359 flagword new_flags;
3360 bfd_boolean error;
3366 /* Check if we have the same endianess. */
3373 {
3374 /* First call, no flags set. */
3377 }
3379 /* Compatible flags are ok. */
3381 ;
3383 /* Incompatible flags. */
3384 else
3385 {
3386 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
3387 to be linked with either. */
3391 {
3396 }
3399 {
3404 }
3406 /* The output is -mrelocatable-lib iff both the input files are. */
3410 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
3411 but each input file is either -mrelocatable or -mrelocatable-lib. */
3417 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
3418 any module uses it. */
3424 /* Warn about any other mismatches. */
3426 {
3432 }
3435 {
3438 }
3439 }
3442 }
3443 \f
3444 /* Choose which PLT scheme to use, and set .plt flags appropriately.
3445 Returns -1 on error, 0 for old PLT, 1 for new PLT. */
3446 int
3450 {
3458 {
3462 /* The new PLT is a loaded section. */
3467 /* The new GOT is not executable. */
3471 }
3472 else
3473 {
3474 /* Stop an unused .glink section from affecting .text alignment. */
3478 }
3480 }
3481 \f
3482 /* Return the section that should be marked against GC for a given
3483 relocation. */
3491 {
3493 {
3495 {
3502 {
3512 }
3513 }
3514 }
3515 else
3519 }
3521 /* Update the got, plt and dynamic reloc reference counts for the
3522 section being removed. */
3524 static bfd_boolean
3529 {
3550 {
3557 {
3569 {
3570 /* Everything must go for SEC. */
3573 }
3574 }
3578 {
3584 /* Fall thru */
3603 {
3606 }
3608 {
3611 }
3621 /* Fall thru */
3640 {
3645 }
3650 }
3651 }
3653 }
3654 \f
3655 /* Set htab->tls_get_addr and call the generic ELF tls_setup function. */
3657 asection *
3659 {
3666 {
3669 }
3674 }
3676 /* Run through all the TLS relocs looking for optimization
3677 opportunities. */
3679 bfd_boolean
3682 {
3692 {
3698 {
3702 /* Read the relocations. */
3711 {
3717 bfd_boolean is_local;
3721 {
3729 }
3738 {
3743 /* These relocs should never be against a symbol
3744 defined in a shared lib. Leave them alone if
3745 that turns out to be the case. */
3751 /* LD -> LE */
3762 /* GD -> LE */
3764 else
3765 /* GD -> IE */
3777 {
3778 /* IE -> LE */
3782 }
3783 else
3793 {
3797 }
3804 }
3807 {
3809 {
3810 /* We managed to get rid of a got entry. */
3813 }
3815 }
3816 else
3817 {
3823 {
3830 {
3834 }
3835 }
3841 {
3842 /* We managed to get rid of a got entry. */
3845 }
3848 }
3852 }
3856 }
3860 {
3863 else
3865 }
3866 }
3868 }
3869 \f
3870 /* Adjust a symbol defined by a dynamic object and referenced by a
3871 regular object. The current definition is in some section of the
3872 dynamic object, but we're not including those sections. We have to
3873 change the definition to something the rest of the link can
3874 understand. */
3876 static bfd_boolean
3879 {
3884 #ifdef DEBUG
3887 #endif
3889 /* Make sure we know what is going on here. */
3898 /* Deal with function syms. */
3901 {
3902 /* Clear procedure linkage table information for any symbol that
3903 won't need a .plt entry. */
3912 {
3913 /* A PLT entry is not required/allowed when:
3915 1. We are not using ld.so; because then the PLT entry
3916 can't be set up, so we can't use one. In this case,
3917 ppc_elf_adjust_dynamic_symbol won't even be called.
3919 2. GC has rendered the entry unused.
3921 3. We know for certain that a call to this symbol
3922 will go to this object, or will remain undefined. */
3925 }
3927 }
3928 else
3931 /* If this is a weak symbol, and there is a real definition, the
3932 processor independent code will have arranged for us to see the
3933 real definition first, and we can just use the same value. */
3935 {
3943 }
3945 /* This is a reference to a symbol defined by a dynamic object which
3946 is not a function. */
3948 /* If we are creating a shared library, we must presume that the
3949 only references to the symbol are via the global offset table.
3950 For such cases we need not do anything here; the relocations will
3951 be handled correctly by relocate_section. */
3955 /* If there are no references to this symbol that do not use the
3956 GOT, we don't need to generate a copy reloc. */
3960 /* If we didn't find any dynamic relocs in read-only sections, then we'll
3961 be keeping the dynamic relocs and avoiding the copy reloc. We can't
3962 do this if there are any small data relocations. */
3965 {
3968 {
3972 }
3975 {
3978 }
3979 }
3981 /* We must allocate the symbol in our .dynbss section, which will
3982 become part of the .bss section of the executable. There will be
3983 an entry for this symbol in the .dynsym section. The dynamic
3984 object will contain position independent code, so all references
3985 from the dynamic object to this symbol will go through the global
3986 offset table. The dynamic linker will use the .dynsym entry to
3987 determine the address it must put in the global offset table, so
3988 both the dynamic object and the regular object will refer to the
3989 same memory location for the variable.
3991 Of course, if the symbol is referenced using SDAREL relocs, we
3992 must instead allocate it in .sbss. */
3996 else
4000 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
4001 copy the initial value out of the dynamic object and into the
4002 runtime process image. We need to remember the offset into the
4003 .rela.bss section we are going to use. */
4005 {
4010 else
4015 }
4017 /* We need to figure out the alignment required for this symbol. I
4018 have no idea how ELF linkers handle this. */
4023 /* Apply the required alignment. */
4026 {
4029 }
4031 /* Define the symbol as being at this point in the section. */
4035 /* Increment the section size to make room for the symbol. */
4039 }
4040 \f
4041 /* Allocate NEED contiguous space in .got, and return the offset.
4042 Handles allocation of the got header when crossing 32k. */
4044 static bfd_vma
4046 {
4047 bfd_vma where;
4054 {
4057 }
4058 else
4059 {
4062 {
4065 }
4068 }
4070 }
4072 /* Allocate space in associated reloc sections for dynamic relocs. */
4074 static bfd_boolean
4076 {
4086 /* When warning symbols are created, they **replace** the "real"
4087 entry in the hash table, thus we never get to see the real
4088 symbol in a hash traversal. So look at it now. */
4093 {
4100 {
4101 /* Make sure this symbol is output as a dynamic symbol. */
4104 {
4107 }
4111 {
4115 {
4117 {
4120 }
4125 {
4128 }
4132 {
4135 }
4137 }
4138 else
4139 {
4141 {
4142 /* If this is the first .plt entry, make room
4143 for the special first entry. */
4147 /* The PowerPC PLT is actually composed of two
4148 parts, the first part is 2 words (for a load
4149 and a jump), and then there is a remaining
4150 word available at the end. */
4151 plt_offset = (PLT_INITIAL_ENTRY_SIZE
4152 + (PLT_SLOT_SIZE
4156 /* If this symbol is not defined in a regular
4157 file, and we are not generating a shared
4158 library, then set the symbol to this location
4159 in the .plt. This is required to make
4160 function pointers compare as equal between
4161 the normal executable and the shared library. */
4164 {
4167 }
4169 /* Make room for this entry. After the 8192nd
4170 entry, room for two entries is allocated. */
4175 }
4177 }
4179 /* We also need to make an entry in the .rela.plt section. */
4181 {
4184 }
4185 }
4186 else
4190 {
4193 }
4194 }
4195 }
4196 else
4197 {
4200 }
4204 {
4205 /* Make sure this symbol is output as a dynamic symbol. */
4208 {
4211 }
4215 /* If just an LD reloc, we'll just use htab->tlsld_got.offset. */
4217 else
4218 {
4219 bfd_boolean dyn;
4222 {
4231 }
4232 else
4240 {
4241 /* All the entries we allocated need relocs.
4242 Except LD only needs one. */
4246 }
4247 }
4248 }
4249 else
4255 /* In the shared -Bsymbolic case, discard space allocated for
4256 dynamic pc-relative relocs against symbols which turn out to be
4257 defined in regular objects. For the normal shared case, discard
4258 space for relocs that have become local due to symbol visibility
4259 changes. */
4262 {
4263 /* Relocs that use pc_count are those that appear on a call insn,
4264 or certain REL relocs (see MUST_BE_DYN_RELOC) that can be
4265 generated via assembly. We want calls to protected symbols to
4266 resolve directly to the function rather than going via the plt.
4267 If people want function pointer comparisons to work as expected
4268 then they should avoid writing weird assembly. */
4270 {
4274 {
4279 else
4281 }
4282 }
4284 /* Also discard relocs on undefined weak syms with non-default
4285 visibility. */
4290 /* Make sure undefined weak symbols are output as a dynamic symbol
4291 in PIEs. */
4297 {
4300 }
4301 }
4303 {
4304 /* For the non-shared case, discard space for relocs against
4305 symbols which turn out to need copy relocs or are not
4306 dynamic. */
4311 {
4312 /* Make sure this symbol is output as a dynamic symbol.
4313 Undefined weak syms won't yet be marked as dynamic. */
4316 {
4319 }
4321 /* If that succeeded, we know we'll be keeping all the
4322 relocs. */
4325 }
4329 keep: ;
4330 }
4332 /* Finally, allocate space. */
4334 {
4337 }
4340 }
4342 /* Find any dynamic relocs that apply to read-only sections. */
4344 static bfd_boolean
4346 {
4356 {
4362 {
4365 /* Not an error, just cut short the traversal. */
4367 }
4368 }
4370 }
4372 /* Set the sizes of the dynamic sections. */
4374 static bfd_boolean
4377 {
4380 bfd_boolean relocs;
4383 #ifdef DEBUG
4385 #endif
4391 {
4392 /* Set the contents of the .interp section to the interpreter. */
4394 {
4399 }
4400 }
4404 else
4407 /* Set up .got offsets for local syms, and space for local dynamic
4408 relocs. */
4410 {
4414 bfd_size_type locsymcount;
4421 {
4428 {
4431 {
4432 /* Input section has been discarded, either because
4433 it is a copy of a linkonce section or due to
4434 linker script /DISCARD/, so we'll be discarding
4435 the relocs too. */
4436 }
4438 {
4445 }
4446 }
4447 }
4459 {
4461 {
4462 /* If just an LD reloc, we'll just use
4463 htab->tlsld_got.offset. */
4466 }
4467 else
4468 {
4471 {
4478 }
4479 else
4485 }
4486 }
4487 else
4489 }
4492 {
4496 }
4497 else
4500 /* Allocate space for global sym dynamic relocs. */
4504 {
4507 /* If we haven't allocated the header, do so now. */
4509 {
4512 }
4517 }
4520 {
4522 /* Space for the branch table. */
4524 /* Pad out to align the start of PLTresolve. */
4527 }
4529 /* We've now determined the sizes of the various dynamic sections.
4530 Allocate memory for them. */
4533 {
4541 {
4542 /* Strip this section if we don't need it; see the
4543 comment below. */
4544 }
4547 {
4548 /* Strip these too. */
4549 }
4551 {
4553 {
4554 /* If we don't need this section, strip it from the
4555 output file. This is mostly to handle .rela.bss and
4556 .rela.plt. We must create both sections in
4557 create_dynamic_sections, because they must be created
4558 before the linker maps input sections to output
4559 sections. The linker does that before
4560 adjust_dynamic_symbol is called, and it is that
4561 function which decides whether anything needs to go
4562 into these sections. */
4563 }
4564 else
4565 {
4566 /* Remember whether there are any relocation sections. */
4569 /* We use the reloc_count field as a counter if we need
4570 to copy relocs into the output file. */
4572 }
4573 }
4574 else
4575 {
4576 /* It's not one of our sections, so don't allocate space. */
4578 }
4581 {
4584 }
4589 /* Allocate memory for the section contents. */
4593 }
4596 {
4597 /* Add some entries to the .dynamic section. We fill in the
4598 values later, in ppc_elf_finish_dynamic_sections, but we
4599 must add the entries now so that we get the correct size for
4600 the .dynamic section. The DT_DEBUG entry is filled in by the
4601 dynamic linker and used by the debugger. */
4602 #define add_dynamic_entry(TAG, VAL) \
4603 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
4606 {
4609 }
4612 {
4618 }
4621 {
4624 }
4627 {
4632 }
4634 /* If any dynamic relocs apply to a read-only section, then we
4635 need a DT_TEXTREL entry. */
4638 info);
4641 {
4644 }
4645 }
4646 #undef add_dynamic_entry
4649 }
4650 \f
4651 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
4654 {
4663 };
4666 {
4671 };
4673 static bfd_boolean
4678 {
4679 struct one_fixup
4680 {
4683 bfd_vma toff;
4684 bfd_vma trampoff;
4685 };
4693 bfd_boolean changed;
4695 bfd_size_type trampoff;
4700 /* Nothing to do if there are no relocations, and no need to do
4701 anything with non-alloc sections. */
4708 /* Space for a branch around any trampolines. */
4713 /* Get a copy of the native relocations. */
4724 {
4736 {
4751 }
4753 /* Get the value of the symbol referred to by the reloc. */
4755 {
4756 /* A local symbol. */
4759 /* Read this BFD's local symbols. */
4761 {
4769 }
4777 else
4782 }
4783 else
4784 {
4785 /* Global symbol handling. */
4800 {
4804 {
4806 {
4809 }
4810 else
4811 {
4814 }
4815 }
4816 }
4818 ;
4821 {
4824 }
4825 else
4829 }
4831 /* If the branch and target are in the same section, you have
4832 no hope of adding stubs. We'll error out later should the
4833 branch overflow. */
4837 /* There probably isn't any reason to handle symbols in
4838 SEC_MERGE sections; SEC_MERGE doesn't seem a likely
4839 attribute for a code section, and we are only looking at
4840 branches. However, implement it correctly here as a
4841 reference for other target relax_section functions. */
4843 {
4844 /* At this stage in linking, no SEC_MERGE symbol has been
4845 adjusted, so all references to such symbols need to be
4846 passed through _bfd_merged_section_offset. (Later, in
4847 relocate_section, all SEC_MERGE symbols *except* for
4848 section symbols have been adjusted.)
4850 gas may reduce relocations against symbols in SEC_MERGE
4851 sections to a relocation against the section symbol when
4852 the original addend was zero. When the reloc is against
4853 a section symbol we should include the addend in the
4854 offset passed to _bfd_merged_section_offset, since the
4855 location of interest is the original symbol. On the
4856 other hand, an access to "sym+addend" where "sym" is not
4857 a section symbol should not include the addend; Such an
4858 access is presumed to be an offset from "sym"; The
4859 location of interest is just "sym". */
4865 toff);
4869 }
4870 /* PLTREL24 addends are special. */
4879 /* If the branch is in range, no need to do anything. */
4883 /* Look for an existing fixup to this address. */
4889 {
4895 /* Oh dear, we can't reach a trampoline. Don't try to add
4896 one. We'll report an error later. */
4900 {
4904 }
4905 else
4906 {
4910 }
4919 /* Hijack the old relocation. Since we need two
4920 relocations for this use a "composite" reloc. */
4922 stub_rtype);
4925 /* Record the fixup so we don't do it again this section. */
4934 }
4935 else
4936 {
4941 /* Nop out the reloc, since we're finalizing things here. */
4943 }
4945 /* Get the section contents. */
4947 {
4948 /* Get cached copy if it exists. */
4951 else
4952 {
4953 /* Go get them off disk. */
4956 }
4957 }
4959 /* Fix up the existing branch to hit the trampoline. */
4962 {
4980 }
4981 }
4983 /* Write out the trampolines. */
4986 {
4989 bfd_vma val;
4992 do
4993 {
4997 }
5005 /* Branch around the trampolines. */
5013 {
5016 }
5017 else
5018 {
5021 }
5025 {
5027 i++;
5031 }
5033 }
5037 {
5040 else
5041 {
5042 /* Cache the symbols for elf_link_input_bfd. */
5044 }
5045 }
5049 {
5052 else
5053 {
5054 /* Cache the section contents for elf_link_input_bfd. */
5056 }
5057 }
5060 {
5063 else
5065 }
5070 error_return:
5080 }
5081 \f
5082 /* Set _SDA_BASE_, _SDA2_BASE, and sbss start and end syms. They are
5083 set here rather than via PROVIDE in the default linker script,
5084 because using PROVIDE inside an output section statement results in
5085 unnecessary output sections. Using PROVIDE outside an output section
5086 statement runs the risk of section alignment affecting where the
5087 section starts. */
5089 bfd_boolean
5091 {
5095 bfd_vma val;
5100 {
5117 }
5130 }
5131 \f
5132 /* Fill in the address for a pointer generated in a linker section. */
5134 static bfd_vma
5138 bfd_vma relocation,
5140 {
5146 {
5147 /* Handle global symbol. */
5153 }
5154 else
5155 {
5156 /* Handle local symbol. */
5161 }
5165 lsect);
5168 /* Offset will always be a multiple of four, so use the bottom bit
5169 as a "written" flag. */
5171 {
5176 }
5182 #ifdef DEBUG
5186 #endif
5188 /* Subtract out the addend, because it will get added back in by the normal
5189 processing. */
5191 }
5193 /* The RELOCATE_SECTION function is called by the ELF backend linker
5194 to handle the relocations for a section.
5196 The relocs are always passed as Rela structures; if the section
5197 actually uses Rel structures, the r_addend field will always be
5198 zero.
5200 This function is responsible for adjust the section contents as
5201 necessary, and (if using Rela relocs and generating a
5202 relocatable output file) adjusting the reloc addend as
5203 necessary.
5205 This function does not have to worry about setting the reloc
5206 address or the reloc symbol index.
5208 LOCAL_SYMS is a pointer to the swapped in local symbols.
5210 LOCAL_SECTIONS is an array giving the section in the input file
5211 corresponding to the st_shndx field of each local symbol.
5213 The global hash table entry for the global symbols can be found
5214 via elf_sym_hashes (input_bfd).
5216 When generating relocatable output, this function must handle
5217 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
5218 going to be the section symbol corresponding to the output
5219 section, which means that the addend must be adjusted
5220 accordingly. */
5222 static bfd_boolean
5231 {
5237 Elf_Internal_Rela outrel;
5243 #ifdef DEBUG
5249 #endif
5254 {
5261 {
5267 {
5268 /* R_PPC_PLTREL24 is rather special. If non-zero, the
5269 addend specifies the GOT pointer offset within .got2. */
5271 }
5272 }
5274 }
5276 /* Initialize howto table if not already done. */
5287 {
5289 bfd_vma addend;
5290 bfd_reloc_status_type r;
5297 bfd_vma relocation;
5299 bfd_boolean unresolved_reloc;
5300 bfd_boolean warned;
5312 {
5318 }
5319 else
5320 {
5327 }
5329 /* TLS optimizations. Replace instruction sequences and relocs
5330 based on information we collected in tls_optimize. We edit
5331 RELOCS so that --emit-relocs will output something sensible
5332 for the final instruction stream. */
5336 {
5340 {
5344 }
5345 }
5347 /* Ensure reloc mapping code below stays sane. */
5358 {
5366 {
5367 bfd_vma insn;
5374 }
5380 {
5389 else
5392 /* add -> addi. */
5398 /* load and store indexed -> dform. */
5402 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
5407 /* lwax -> lwa. */
5409 else
5415 /* Was PPC_TLS which sits on insn boundary, now
5416 PPC_TPREL16_LO which is at insn+2. */
5418 }
5431 {
5432 tls_gdld_hi:
5436 else
5437 {
5441 }
5443 }
5456 {
5457 tls_get_addr_check:
5459 {
5464 bfd_vma offset;
5466 /* The next instruction should be a call to
5467 __tls_get_addr. Peek at the reloc to be sure. */
5485 /* OK, it checks out. Replace the call. */
5490 {
5491 /* IE */
5499 }
5500 else
5501 {
5502 /* LE */
5506 {
5507 /* Was an LD reloc. */
5511 }
5515 R_PPC_TPREL16_LO);
5517 }
5521 {
5522 /* We changed the symbol on an LD reloc. Start over
5523 in order to get h, sym, sec etc. right. */
5524 rel--;
5526 }
5527 }
5528 }
5530 }
5532 /* Handle other relocations that tweak non-addend part of insn. */
5535 {
5539 /* Branch taken prediction relocations. */
5543 /* Fall thru */
5545 /* Branch not taken prediction relocations. */
5556 /* Invert 'y' bit if not the default. */
5562 }
5570 {
5587 /* GOT16 relocations. Like an ADDR16 using the symbol's
5588 address in the GOT as relocation value instead of the
5589 symbol's value itself. Also, create a GOT entry for the
5590 symbol and put the symbol value there. */
5623 dogot:
5624 {
5625 /* Relocation is to the entry for this symbol in the global
5626 offset table. */
5627 bfd_vma off;
5640 {
5641 bfd_boolean dyn;
5646 /* This is actually a static link, or it is a
5647 -Bsymbolic link and the symbol is defined
5648 locally, or the symbol was forced to be local
5649 because of a version file. */
5650 ;
5651 else
5652 {
5655 }
5657 }
5658 else
5659 {
5663 }
5665 /* The offset must always be a multiple of 4. We use the
5666 least significant bit to record whether we have already
5667 processed this entry. */
5671 else
5672 {
5683 /* We might have multiple got entries for this sym.
5684 Initialize them all. */
5685 do
5686 {
5690 {
5693 }
5695 {
5698 }
5700 {
5703 }
5705 {
5708 }
5710 /* Generate relocs for the dynamic linker. */
5715 {
5721 {
5724 {
5731 outrel.r_info
5733 }
5734 }
5741 else
5744 {
5748 }
5753 }
5755 /* Init the .got section contents if we're not
5756 emitting a reloc. */
5757 else
5758 {
5764 {
5770 {
5774 }
5775 }
5778 }
5783 }
5788 }
5794 {
5796 {
5802 {
5806 {
5809 }
5810 }
5811 }
5812 }
5817 /* Addends on got relocations don't make much sense.
5818 x+off@got is actually x@got+off, and since the got is
5819 generated by a hash table traversal, the value in the
5820 got at entry m+n bears little relation to the entry m. */
5824 input_bfd,
5825 input_section,
5828 sym_name);
5829 }
5832 /* Relocations that need no special processing. */
5834 /* It makes no sense to point a local relocation
5835 at a symbol not in this object. */
5837 {
5840 input_bfd,
5841 input_section,
5843 TRUE))
5846 }
5856 /* Relocations that may need to be propagated if this is a shared
5857 object. */
5863 /* The TPREL16 relocs shouldn't really be used in shared
5864 libs as they will result in DT_TEXTREL being set, but
5865 support them anyway. */
5892 /* If these relocations are not to a named symbol, they can be
5893 handled right here, no need to bother the dynamic linker. */
5897 /* fall through */
5899 /* Relocations that always need to be propagated if this is a shared
5900 object. */
5912 /* r_symndx will be zero only for relocs against symbols
5913 from removed linkonce sections, or sections discarded by
5914 a linker script. */
5915 dodyn:
5918 /* Fall thru. */
5922 /* Fall thru. */
5930 || (ELIMINATE_COPY_RELOCS
5937 {
5940 #ifdef DEBUG
5945 #endif
5947 /* When generating a shared object, these relocations
5948 are copied into the output file to be resolved at run
5949 time. */
5951 {
5954 name = (bfd_elf_string_from_elf_section
5963 input_section),
5968 }
5984 {
5988 }
5989 else
5990 {
5995 else
5996 {
6002 {
6005 }
6006 else
6007 {
6010 /* We are turning this relocation into one
6011 against a section symbol. It would be
6012 proper to subtract the symbol's value,
6013 osec->vma, from the emitted reloc addend,
6014 but ld.so expects buggy relocs. */
6018 #ifdef DEBUG
6023 #endif
6024 }
6027 }
6028 }
6037 /* This reloc will be computed at runtime. We clear the memory
6038 so that it contains predictable value. */
6042 {
6046 }
6047 }
6052 {
6059 else
6064 }
6067 /* Fall thru */
6073 /* Fall thru */
6076 relax32:
6077 {
6084 /* We're clearing the bits for R_PPC_ADDR16_HA
6085 and R_PPC_ADDR16_LO here. */
6089 /* t0 is HA, t1 is LO */
6096 }
6099 /* Indirect .sdata relocation. */
6102 relocation
6107 /* Indirect .sdata2 relocation. */
6110 relocation
6115 /* Handle the TOC16 reloc. We want to use the offset within the .got
6116 section, not the actual VMA. This is appropriate when generating
6117 an embedded ELF object, for which the .got section acts like the
6118 AIX .toc section. */
6129 /* Relocation is to the entry for this symbol in the
6130 procedure linkage table. */
6131 {
6137 {
6138 /* We didn't make a PLT entry for this symbol. This
6139 happens when statically linking PIC code, or when
6140 using -Bsymbolic. */
6142 }
6149 else
6153 }
6156 /* Relocate against _SDA_BASE_. */
6158 {
6167 {
6171 input_bfd,
6172 sym_name,
6174 name);
6175 }
6177 }
6180 /* Relocate against _SDA2_BASE_. */
6182 {
6189 {
6193 input_bfd,
6194 sym_name,
6196 name);
6201 }
6203 }
6206 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
6209 {
6219 {
6222 }
6226 {
6229 }
6233 {
6235 }
6237 else
6238 {
6242 input_bfd,
6243 sym_name,
6245 name);
6250 }
6257 }
6258 }
6261 /* Relocate against the beginning of the section. */
6270 /* Negative relocations. */
6296 input_bfd,
6298 sym_name);
6303 }
6305 /* Do any further special processing. */
6307 {
6324 /* It's just possible that this symbol is a weak symbol
6325 that's not actually defined anywhere. In that case,
6326 'sec' would be NULL, and we should leave the symbol
6327 alone (it will be set to zero elsewhere in the link). */
6329 /* Add 0x10000 if sign bit in 0:15 is set.
6330 Bits 0:15 are not used. */
6333 }
6335 #ifdef DEBUG
6340 sym_name,
6341 r_symndx,
6344 #endif
6349 {
6352 input_bfd,
6353 input_section,
6356 sym_name);
6358 }
6361 input_bfd,
6362 input_section,
6363 contents,
6365 relocation,
6366 addend);
6369 {
6371 {
6377 {
6378 /* Assume this is a call protected by other code that
6379 detect the symbol is undefined. If this is the case,
6380 we can safely ignore the overflow. If not, the
6381 program is hosed anyway, and a little warning isn't
6382 going to help. */
6385 }
6389 sym_name,
6392 input_bfd,
6393 input_section,
6396 }
6397 else
6398 {
6404 }
6405 }
6406 }
6408 #ifdef DEBUG
6410 #endif
6413 }
6414 \f
6415 #define PPC_LO(v) ((v) & 0xffff)
6416 #define PPC_HI(v) (((v) >> 16) & 0xffff)
6417 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
6419 /* Finish up dynamic symbol handling. We set the contents of various
6420 dynamic sections here. */
6422 static bfd_boolean
6427 {
6430 bfd_boolean doneone;
6432 #ifdef DEBUG
6435 #endif
6443 {
6445 {
6446 Elf_Internal_Rela rela;
6448 bfd_vma reloc_index;
6450 /* This symbol has an entry in the procedure linkage table.
6451 Set it up. */
6453 {
6454 /* We don't need to fill in the .plt. The ppc dynamic
6455 linker will fill it in. */
6456 }
6457 else
6458 {
6464 }
6466 /* Fill in the entry in the .rela.plt section. */
6475 else
6476 {
6481 }
6487 {
6488 /* Mark the symbol as undefined, rather than as defined in
6489 the .plt section. Leave the value alone. */
6491 /* If the symbol is weak, we do need to clear the value.
6492 Otherwise, the PLT entry would provide a definition for
6493 the symbol even if the symbol wasn't defined anywhere,
6494 and so the symbol would never be NULL. */
6497 }
6499 }
6502 {
6503 bfd_vma plt;
6512 {
6527 {
6536 }
6537 else
6538 {
6547 }
6548 }
6549 else
6550 {
6560 /* We only need one non-PIC glink stub. */
6562 }
6563 }
6564 else
6566 }
6569 {
6571 Elf_Internal_Rela rela;
6574 /* This symbols needs a copy reloc. Set it up. */
6576 #ifdef DEBUG
6578 #endif
6584 else
6595 }
6597 #ifdef DEBUG
6599 #endif
6601 /* Mark some specially defined symbols as absolute. */
6608 }
6609 \f
6610 static enum elf_reloc_type_class
6612 {
6614 {
6625 }
6626 }
6627 \f
6628 /* Finish up the dynamic sections. */
6630 static bfd_boolean
6633 {
6636 bfd_vma got;
6638 #ifdef DEBUG
6640 #endif
6652 {
6660 {
6661 Elf_Internal_Dyn dyn;
6667 {
6688 }
6691 }
6692 }
6694 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
6695 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
6697 {
6699 bfd_vma val;
6711 }
6714 {
6717 bfd_vma res0;
6720 /*
6721 * PIC glink code is the following:
6722 *
6723 * # ith PLT code stub.
6724 * addis 11,30,(plt+(i-1)*4-got)@ha
6725 * lwz 11,(plt+(i-1)*4-got)@l(11)
6726 * mtctr 11
6727 * bctr
6728 *
6729 * # A table of branches, one for each plt entry.
6730 * # The idea is that the plt call stub loads ctr (and r11) with these
6731 * # addresses, so (r11 - res_0) gives the plt index * 4.
6732 * res_0: b PLTresolve
6733 * res_1: b PLTresolve
6734 * .
6735 * # Some number of entries towards the end can be nops
6736 * res_n_m3: nop
6737 * res_n_m2: nop
6738 * res_n_m1:
6739 *
6740 * PLTresolve:
6741 * addis 11,11,(1f-res_0)@ha
6742 * mflr 0
6743 * bcl 20,31,1f
6744 * 1: addi 11,11,(1b-res_0)@l
6745 * mflr 12
6746 * mtlr 0
6747 * sub 11,11,12 # r11 = index * 4
6748 * addis 12,12,(got+4-1b)@ha
6749 * lwz 0,(got+4-1b)@l(12) # got[1] address of dl_runtime_resolve
6750 * lwz 12,(got+8-1b)@l(12) # got[2] contains the map address
6751 * mtctr 0
6752 * add 0,11,11
6753 * add 11,0,11 # r11 = index * 12 = reloc offset.
6754 * bctr
6755 */
6757 {
6758 ADDIS_11_11,
6759 MFLR_0,
6760 BCL_20_31,
6761 ADDI_11_11,
6762 MFLR_12,
6763 MTLR_0,
6764 SUB_11_11_12,
6765 ADDIS_12_12,
6766 LWZ_0_12,
6767 LWZ_12_12,
6768 MTCTR_0,
6769 ADD_0_11_11,
6770 ADD_11_0_11,
6771 BCTR,
6772 NOP,
6773 NOP
6774 };
6777 {
6778 LIS_12,
6779 ADDIS_11_11,
6780 LWZ_0_12,
6781 ADDI_11_11,
6782 MTCTR_0,
6783 ADD_0_11_11,
6784 LWZ_12_12,
6785 ADD_11_0_11,
6786 BCTR,
6787 NOP,
6788 NOP,
6789 NOP,
6790 NOP,
6791 NOP,
6792 NOP,
6793 NOP
6794 };
6801 /* Build the branch table, one for each plt entry (less one),
6802 and perhaps some padding. */
6808 {
6811 }
6813 {
6816 }
6822 /* Last comes the PLTresolve stub. */
6824 {
6825 bfd_vma bcl;
6828 {
6831 }
6845 {
6850 }
6851 else
6852 {
6857 }
6858 }
6859 else
6860 {
6862 {
6865 }
6875 {
6880 }
6881 else
6882 {
6887 }
6888 }
6889 }
6892 }
6893 \f
6894 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
6896 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
6898 #define ELF_ARCH bfd_arch_powerpc
6899 #define ELF_MACHINE_CODE EM_PPC
6900 #ifdef __QNXTARGET__
6901 #define ELF_MAXPAGESIZE 0x1000
6902 #else
6903 #define ELF_MAXPAGESIZE 0x10000
6904 #endif
6905 #define ELF_MINPAGESIZE 0x1000
6906 #define elf_info_to_howto ppc_elf_info_to_howto
6908 #ifdef EM_CYGNUS_POWERPC
6909 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
6910 #endif
6912 #ifdef EM_PPC_OLD
6913 #define ELF_MACHINE_ALT2 EM_PPC_OLD
6914 #endif
6916 #define elf_backend_plt_not_loaded 1
6917 #define elf_backend_can_gc_sections 1
6918 #define elf_backend_can_refcount 1
6919 #define elf_backend_rela_normal 1
6921 #define bfd_elf32_mkobject ppc_elf_mkobject
6922 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
6923 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
6924 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
6925 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
6926 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create
6928 #define elf_backend_object_p ppc_elf_object_p
6929 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
6930 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
6931 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
6932 #define elf_backend_relocate_section ppc_elf_relocate_section
6933 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
6934 #define elf_backend_check_relocs ppc_elf_check_relocs
6935 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol
6936 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
6937 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
6938 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
6939 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
6940 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
6941 #define elf_backend_fake_sections ppc_elf_fake_sections
6942 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
6943 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
6944 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
6945 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
6946 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing
6947 #define elf_backend_final_write_processing ppc_elf_final_write_processing
6948 #define elf_backend_write_section ppc_elf_write_section
6949 #define elf_backend_special_sections ppc_elf_special_sections
6950 #define elf_backend_plt_sym_val ppc_elf_plt_sym_val