| blob | d1cd431810ad9acb5dd8f21fef454343aa42b93e |
1 /* PowerPC-specific support for 32-bit ELF
2 Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
3 2004, 2005, 2006, 2007 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. */
28 #include <stdarg.h>
38 /* RELA relocations are used here. */
40 static bfd_reloc_status_type ppc_elf_addr16_ha_reloc
42 static bfd_reloc_status_type ppc_elf_unhandled_reloc
45 /* Branch prediction bit for branch taken relocs. */
46 #define BRANCH_PREDICT_BIT 0x200000
47 /* Mask to set RA in memory instructions. */
48 #define RA_REGISTER_MASK 0x001f0000
49 /* Value to shift register by to insert RA. */
50 #define RA_REGISTER_SHIFT 16
52 /* The name of the dynamic interpreter. This is put in the .interp
53 section. */
56 /* For old-style PLT. */
57 /* The number of single-slot PLT entries (the rest use two slots). */
58 #define PLT_NUM_SINGLE_ENTRIES 8192
60 /* For new-style .glink and .plt. */
61 #define GLINK_PLTRESOLVE 16*4
62 #define GLINK_ENTRY_SIZE 4*4
64 /* VxWorks uses its own plt layout, filled in by the static linker. */
66 /* The standard VxWorks PLT entry. */
67 #define VXWORKS_PLT_ENTRY_SIZE 32
68 static const bfd_vma ppc_elf_vxworks_plt_entry
70 {
79 };
80 static const bfd_vma ppc_elf_vxworks_pic_plt_entry
82 {
91 };
93 /* The initial VxWorks PLT entry. */
94 #define VXWORKS_PLT_INITIAL_ENTRY_SIZE 32
95 static const bfd_vma ppc_elf_vxworks_plt0_entry
97 {
106 };
107 static const bfd_vma ppc_elf_vxworks_pic_plt0_entry
109 {
118 };
120 /* For executables, we have some additional relocations in
121 .rela.plt.unloaded, for the kernel loader. */
123 /* The number of non-JMP_SLOT relocations per PLT0 slot. */
124 #define VXWORKS_PLT_NON_JMP_SLOT_RELOCS 3
125 /* The number of relocations in the PLTResolve slot. */
126 #define VXWORKS_PLTRESOLVE_RELOCS 2
127 /* The number of relocations in the PLTResolve slot when when creating
128 a shared library. */
129 #define VXWORKS_PLTRESOLVE_RELOCS_SHLIB 0
131 /* Some instructions. */
132 #define ADDIS_11_11 0x3d6b0000
133 #define ADDIS_11_30 0x3d7e0000
134 #define ADDIS_12_12 0x3d8c0000
135 #define ADDI_11_11 0x396b0000
136 #define ADD_0_11_11 0x7c0b5a14
137 #define ADD_11_0_11 0x7d605a14
138 #define B 0x48000000
139 #define BCL_20_31 0x429f0005
140 #define BCTR 0x4e800420
141 #define LIS_11 0x3d600000
142 #define LIS_12 0x3d800000
143 #define LWZU_0_12 0x840c0000
144 #define LWZ_0_12 0x800c0000
145 #define LWZ_11_11 0x816b0000
146 #define LWZ_11_30 0x817e0000
147 #define LWZ_12_12 0x818c0000
148 #define MFLR_0 0x7c0802a6
149 #define MFLR_12 0x7d8802a6
150 #define MTCTR_0 0x7c0903a6
151 #define MTCTR_11 0x7d6903a6
152 #define MTLR_0 0x7c0803a6
153 #define NOP 0x60000000
154 #define SUB_11_11_12 0x7d6c5850
156 /* Offset of tp and dtp pointers from start of TLS block. */
157 #define TP_OFFSET 0x7000
158 #define DTP_OFFSET 0x8000
159 \f
163 /* This reloc does nothing. */
178 /* A standard 32 bit relocation. */
193 /* An absolute 26 bit branch; the lower two bits must be zero.
194 FIXME: we don't check that, we just clear them. */
209 /* A standard 16 bit relocation. */
224 /* A 16 bit relocation without overflow. */
239 /* The high order 16 bits of an address. */
254 /* The high order 16 bits of an address, plus 1 if the contents of
255 the low 16 bits, treated as a signed number, is negative. */
270 /* An absolute 16 bit branch; the lower two bits must be zero.
271 FIXME: we don't check that, we just clear them. */
286 /* An absolute 16 bit branch, for which bit 10 should be set to
287 indicate that the branch is expected to be taken. The lower two
288 bits must be zero. */
303 /* An absolute 16 bit branch, for which bit 10 should be set to
304 indicate that the branch is not expected to be taken. The lower
305 two bits must be zero. */
320 /* A relative 26 bit branch; the lower two bits must be zero. */
335 /* A relative 16 bit branch; the lower two bits must be zero. */
350 /* A relative 16 bit branch. Bit 10 should be set to indicate that
351 the branch is expected to be taken. The lower two bits must be
352 zero. */
367 /* A relative 16 bit branch. Bit 10 should be set to indicate that
368 the branch is not expected to be taken. The lower two bits must
369 be zero. */
384 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the
385 symbol. */
400 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
401 the symbol. */
416 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
417 the symbol. */
432 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
433 the symbol. */
448 /* Like R_PPC_REL24, but referring to the procedure linkage table
449 entry for the symbol. */
464 /* This is used only by the dynamic linker. The symbol should exist
465 both in the object being run and in some shared library. The
466 dynamic linker copies the data addressed by the symbol from the
467 shared library into the object, because the object being
468 run has to have the data at some particular address. */
483 /* Like R_PPC_ADDR32, but used when setting global offset table
484 entries. */
499 /* Marks a procedure linkage table entry for a symbol. */
514 /* Used only by the dynamic linker. When the object is run, this
515 longword is set to the load address of the object, plus the
516 addend. */
531 /* Like R_PPC_REL24, but uses the value of the symbol within the
532 object rather than the final value. Normally used for
533 _GLOBAL_OFFSET_TABLE_. */
548 /* Like R_PPC_ADDR32, but may be unaligned. */
563 /* Like R_PPC_ADDR16, but may be unaligned. */
578 /* 32-bit PC relative */
593 /* 32-bit relocation to the symbol's procedure linkage table.
594 FIXME: not supported. */
609 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
610 FIXME: not supported. */
625 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
626 the symbol. */
641 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
642 the symbol. */
657 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
658 the symbol. */
673 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
674 small data items. */
689 /* 16-bit section relative relocation. */
704 /* 16-bit lower half section relative relocation. */
719 /* 16-bit upper half section relative relocation. */
734 /* 16-bit upper half adjusted section relative relocation. */
749 /* Marker reloc for TLS. */
764 /* Computes the load module index of the load module that contains the
765 definition of its TLS sym. */
780 /* Computes a dtv-relative displacement, the difference between the value
781 of sym+add and the base address of the thread-local storage block that
782 contains the definition of sym, minus 0x8000. */
797 /* A 16 bit dtprel reloc. */
812 /* Like DTPREL16, but no overflow. */
827 /* Like DTPREL16_LO, but next higher group of 16 bits. */
842 /* Like DTPREL16_HI, but adjust for low 16 bits. */
857 /* Computes a tp-relative displacement, the difference between the value of
858 sym+add and the value of the thread pointer (r13). */
873 /* A 16 bit tprel reloc. */
888 /* Like TPREL16, but no overflow. */
903 /* Like TPREL16_LO, but next higher group of 16 bits. */
918 /* Like TPREL16_HI, but adjust for low 16 bits. */
933 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
934 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset
935 to the first entry. */
950 /* Like GOT_TLSGD16, but no overflow. */
965 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */
980 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */
995 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
996 with values (sym+add)@dtpmod and zero, and computes the offset to the
997 first entry. */
1012 /* Like GOT_TLSLD16, but no overflow. */
1027 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */
1042 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */
1057 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes
1058 the offset to the entry. */
1073 /* Like GOT_DTPREL16, but no overflow. */
1088 /* Like GOT_DTPREL16_LO, but next higher group of 16 bits. */
1103 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */
1118 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the
1119 offset to the entry. */
1134 /* Like GOT_TPREL16, but no overflow. */
1149 /* Like GOT_TPREL16_LO, but next higher group of 16 bits. */
1164 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */
1179 /* The remaining relocs are from the Embedded ELF ABI, and are not
1180 in the SVR4 ELF ABI. */
1182 /* 32 bit value resulting from the addend minus the symbol. */
1197 /* 16 bit value resulting from the addend minus the symbol. */
1212 /* 16 bit value resulting from the addend minus the symbol. */
1227 /* The high order 16 bits of the addend minus the symbol. */
1242 /* The high order 16 bits of the result of the addend minus the address,
1243 plus 1 if the contents of the low 16 bits, treated as a signed number,
1244 is negative. */
1259 /* 16 bit value resulting from allocating a 4 byte word to hold an
1260 address in the .sdata section, and returning the offset from
1261 _SDA_BASE_ for that relocation. */
1276 /* 16 bit value resulting from allocating a 4 byte word to hold an
1277 address in the .sdata2 section, and returning the offset from
1278 _SDA2_BASE_ for that relocation. */
1293 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
1294 small data items. */
1309 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
1310 signed offset from the appropriate base, and filling in the register
1311 field with the appropriate register (0, 2, or 13). */
1326 /* Relocation not handled: R_PPC_EMB_MRKREF */
1327 /* Relocation not handled: R_PPC_EMB_RELSEC16 */
1328 /* Relocation not handled: R_PPC_EMB_RELST_LO */
1329 /* Relocation not handled: R_PPC_EMB_RELST_HI */
1330 /* Relocation not handled: R_PPC_EMB_RELST_HA */
1331 /* Relocation not handled: R_PPC_EMB_BIT_FLD */
1333 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
1334 in the 16 bit signed offset from the appropriate base, and filling in the
1335 register field with the appropriate register (0, 2, or 13). */
1350 /* A 16 bit relative relocation. */
1365 /* A 16 bit relative relocation without overflow. */
1380 /* The high order 16 bits of a relative address. */
1395 /* The high order 16 bits of a relative address, plus 1 if the contents of
1396 the low 16 bits, treated as a signed number, is negative. */
1411 /* GNU extension to record C++ vtable hierarchy. */
1426 /* GNU extension to record C++ vtable member usage. */
1441 /* Phony reloc to handle AIX style TOC entries. */
1455 };
1456 \f
1457 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
1459 static void
1461 {
1466 i++)
1467 {
1473 }
1474 }
1478 bfd_reloc_code_real_type code)
1479 {
1482 /* Initialize howto table if not already done. */
1487 {
1576 }
1579 };
1584 {
1589 i++)
1595 }
1597 /* Set the howto pointer for a PowerPC ELF reloc. */
1599 static void
1603 {
1604 /* Initialize howto table if not already done. */
1610 }
1612 /* Handle the R_PPC_ADDR16_HA and R_PPC_REL16_HA relocs. */
1614 static bfd_reloc_status_type
1622 {
1623 bfd_vma relocation;
1626 {
1629 }
1636 else
1648 }
1650 static bfd_reloc_status_type
1658 {
1659 /* If this is a relocatable link (output_bfd test tells us), just
1660 call the generic function. Any adjustment will be done at final
1661 link time. */
1667 {
1672 }
1674 }
1675 \f
1676 /* Sections created by the linker. */
1679 {
1680 /* Pointer to the bfd section. */
1682 /* Section name. */
1684 /* Associated bss section name. */
1686 /* Associated symbol name. */
1688 /* Associated symbol. */
1692 /* Linked list of allocated pointer entries. This hangs off of the
1693 symbol lists, and provides allows us to return different pointers,
1694 based on different addend's. */
1697 {
1698 /* next allocated pointer for this symbol */
1700 /* offset of pointer from beginning of section */
1701 bfd_vma offset;
1702 /* addend used */
1703 bfd_vma addend;
1704 /* which linker section this is */
1708 struct ppc_elf_obj_tdata
1709 {
1712 /* A mapping from local symbols to offsets into the various linker
1713 sections added. This is index by the symbol index. */
1715 };
1717 #define ppc_elf_tdata(bfd) \
1718 ((struct ppc_elf_obj_tdata *) (bfd)->tdata.any)
1720 #define elf_local_ptr_offsets(bfd) \
1721 (ppc_elf_tdata (bfd)->linker_section_pointers)
1723 /* Override the generic function because we store some extras. */
1725 static bfd_boolean
1727 {
1729 {
1734 }
1736 }
1738 /* Fix bad default arch selected for a 32 bit input bfd when the
1739 default is 64 bit. */
1741 static bfd_boolean
1743 {
1745 {
1749 {
1750 /* Relies on arch after 64 bit default being 32 bit default. */
1753 }
1754 }
1756 }
1758 /* Function to set whether a module needs the -mrelocatable bit set. */
1760 static bfd_boolean
1762 {
1769 }
1771 /* Support for core dump NOTE sections. */
1773 static bfd_boolean
1775 {
1780 {
1785 /* pr_cursig */
1788 /* pr_pid */
1791 /* pr_reg */
1796 }
1798 /* Make a ".reg/999" section. */
1801 }
1803 static bfd_boolean
1805 {
1807 {
1816 }
1818 /* Note that for some reason, a spurious space is tacked
1819 onto the end of the args in some (at least one anyway)
1820 implementations, so strip it off if it exists. */
1822 {
1828 }
1831 }
1835 {
1837 {
1842 {
1853 }
1856 {
1875 }
1876 }
1877 }
1879 /* Return address for Ith PLT stub in section PLT, for relocation REL
1880 or (bfd_vma) -1 if it should not be included. */
1882 static bfd_vma
1886 {
1888 }
1890 /* Handle a PowerPC specific section when reading an object file. This
1891 is called when bfd_section_from_shdr finds a section with an unknown
1892 type. */
1894 static bfd_boolean
1899 {
1901 flagword flags;
1916 }
1918 /* Set up any other section flags and such that may be necessary. */
1920 static bfd_boolean
1924 {
1932 }
1934 /* If we have .sbss2 or .PPC.EMB.sbss0 output sections, we
1935 need to bump up the number of section headers. */
1937 static int
1940 {
1953 }
1955 /* Add extra PPC sections -- Note, for now, make .sbss2 and
1956 .PPC.EMB.sbss0 a normal section, and not a bss section so
1957 that the linker doesn't crater when trying to make more than
1958 2 sections. */
1961 {
1972 };
1974 /* This is what we want for new plt/got. */
1980 {
1983 /* See if this is one of the special sections. */
1990 {
1994 }
1997 }
1998 \f
1999 /* Very simple linked list structure for recording apuinfo values. */
2001 {
2004 }
2005 apuinfo_list;
2010 static void
2012 {
2014 }
2016 static void
2018 {
2022 {
2026 }
2035 }
2037 static unsigned
2039 {
2044 entry;
2049 }
2053 {
2059 ;
2062 }
2064 static void
2066 {
2070 {
2074 }
2077 }
2082 /* Scan the input BFDs and create a linked list of
2083 the APUinfo values that will need to be emitted. */
2085 static void
2087 {
2092 bfd_size_type output_section_size;
2102 /* Scan the input bfds, looking for apuinfo sections. */
2107 {
2110 {
2113 }
2114 }
2116 /* We need at least one input sections
2117 in order to make merging worthwhile. */
2121 /* Just make sure that the output section exists as well. */
2126 /* Allocate a buffer for the contents of the input sections. */
2134 /* Read in the input sections contents. */
2136 {
2146 {
2149 }
2153 {
2156 }
2158 /* Process the contents of the section. */
2162 /* Verify the contents of the header. Note - we have to
2163 extract the values this way in order to allow for a
2164 host whose endian-ness is different from the target. */
2176 /* Get the number of bytes used for apuinfo entries. */
2181 /* Make sure that we do not run off the end of the section. */
2185 /* Scan the apuinfo section, building a list of apuinfo numbers. */
2189 /* Update the offset. */
2191 }
2195 /* Compute the size of the output section. */
2205 fail:
2210 }
2212 /* Prevent the output section from accumulating the input sections'
2213 contents. We have already stored this in our linked list structure. */
2215 static bfd_boolean
2220 {
2223 }
2225 /* Finally we can generate the output section. */
2227 static void
2229 {
2234 bfd_size_type length;
2249 {
2253 }
2255 /* Create the apuinfo header. */
2264 {
2267 }
2278 }
2279 \f
2280 /* The following functions are specific to the ELF linker, while
2281 functions above are used generally. They appear in this file more
2282 or less in the order in which they are called. eg.
2283 ppc_elf_check_relocs is called early in the link process,
2284 ppc_elf_finish_dynamic_sections is one of the last functions
2285 called. */
2287 /* The PPC linker needs to keep track of the number of relocs that it
2288 decides to copy as dynamic relocs in check_relocs for each symbol.
2289 This is so that it can later discard them if they are found to be
2290 unnecessary. We store the information in a field extending the
2291 regular ELF linker hash table. */
2293 struct ppc_elf_dyn_relocs
2294 {
2297 /* The input section of the reloc. */
2300 /* Total number of relocs copied for the input section. */
2301 bfd_size_type count;
2303 /* Number of pc-relative relocs copied for the input section. */
2304 bfd_size_type pc_count;
2305 };
2307 /* Track PLT entries needed for a given symbol. We might need more
2308 than one glink entry per symbol. */
2309 struct plt_entry
2310 {
2313 /* -fPIC uses multiple GOT sections, one per file, called ".got2".
2314 This field stores the offset into .got2 used to initialise the
2315 GOT pointer reg. It will always be at least 32768 (and for
2316 current gcc this is the only offset used). */
2317 bfd_vma addend;
2319 /* The .got2 section. */
2322 /* PLT refcount or offset. */
2323 union
2324 {
2325 bfd_signed_vma refcount;
2326 bfd_vma offset;
2329 /* .glink stub offset. */
2330 bfd_vma glink_offset;
2331 };
2333 /* Of those relocs that might be copied as dynamic relocs, this macro
2334 selects those that must be copied when linking a shared library,
2335 even when the symbol is local. */
2337 #define MUST_BE_DYN_RELOC(RTYPE) \
2338 ((RTYPE) != R_PPC_REL24 \
2339 && (RTYPE) != R_PPC_REL14 \
2340 && (RTYPE) != R_PPC_REL14_BRTAKEN \
2341 && (RTYPE) != R_PPC_REL14_BRNTAKEN \
2342 && (RTYPE) != R_PPC_REL32)
2344 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
2345 copying dynamic variables from a shared lib into an app's dynbss
2346 section, and instead use a dynamic relocation to point into the
2347 shared lib. */
2348 #define ELIMINATE_COPY_RELOCS 1
2350 /* PPC ELF linker hash entry. */
2352 struct ppc_elf_link_hash_entry
2353 {
2356 /* If this symbol is used in the linker created sections, the processor
2357 specific backend uses this field to map the field into the offset
2358 from the beginning of the section. */
2361 /* Track dynamic relocs copied for this symbol. */
2364 /* Contexts in which symbol is used in the GOT (or TOC).
2365 TLS_GD .. TLS_TLS bits are or'd into the mask as the
2366 corresponding relocs are encountered during check_relocs.
2367 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
2368 indicate the corresponding GOT entry type is not needed. */
2377 /* Nonzero if we have seen a small data relocation referring to this
2378 symbol. */
2380 };
2382 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent))
2385 PLT_UNSET,
2386 PLT_OLD,
2387 PLT_NEW,
2388 PLT_VXWORKS
2389 };
2391 /* PPC ELF linker hash table. */
2393 struct ppc_elf_link_hash_table
2394 {
2397 /* Short-cuts to get to dynamic linker sections. */
2410 /* Shortcut to .__tls_get_addr. */
2413 /* TLS local dynamic got entry handling. */
2415 bfd_signed_vma refcount;
2416 bfd_vma offset;
2419 /* Offset of PltResolve function in glink. */
2420 bfd_vma glink_pltresolve;
2422 /* Size of reserved GOT entries. */
2424 /* Non-zero if allocating the header left a gap. */
2427 /* The type of PLT we have chosen to use. */
2430 /* Whether we can use the new PLT layout. */
2433 /* Set if we should emit symbols for stubs. */
2436 /* Small local sym to section mapping cache. */
2439 /* The (unloaded but important) .rela.plt.unloaded on VxWorks. */
2442 /* The .got.plt section (VxWorks only)*/
2445 /* True if the target system is VxWorks. */
2448 /* The size of PLT entries. */
2450 /* The distance between adjacent PLT slots. */
2452 /* The size of the first PLT entry. */
2454 };
2456 /* Get the PPC ELF linker hash table from a link_info structure. */
2458 #define ppc_elf_hash_table(p) \
2459 ((struct ppc_elf_link_hash_table *) (p)->hash)
2461 /* Create an entry in a PPC ELF linker hash table. */
2467 {
2468 /* Allocate the structure if it has not already been allocated by a
2469 subclass. */
2471 {
2476 }
2478 /* Call the allocation method of the superclass. */
2481 {
2485 }
2488 }
2490 /* Create a PPC ELF linker hash table. */
2494 {
2502 ppc_elf_link_hash_newfunc,
2504 {
2507 }
2529 }
2531 /* Create .got and the related sections. */
2533 static bfd_boolean
2535 {
2538 flagword flags;
2549 {
2553 }
2554 else
2555 {
2556 /* The powerpc .got has a blrl instruction in it. Mark it
2557 executable. */
2562 }
2572 }
2574 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2575 to output sections (just like _bfd_elf_create_dynamic_sections has
2576 to create .dynbss and .rela.bss). */
2578 static bfd_boolean
2580 {
2583 flagword flags;
2611 {
2618 }
2631 /* The VxWorks PLT is a loaded section with contents. */
2634 }
2636 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2638 static void
2642 {
2649 {
2651 {
2655 /* Add reloc counts against the indirect sym to the direct sym
2656 list. Merge any entries against the same section. */
2658 {
2663 {
2668 }
2671 }
2673 }
2677 }
2682 /* If called to transfer flags for a weakdef during processing
2683 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
2684 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
2695 /* If we were called to copy over info for a weak sym, that's all. */
2699 /* Copy over the GOT refcount entries that we may have already seen to
2700 the symbol which just became indirect. */
2704 /* And plt entries. */
2706 {
2708 {
2713 {
2718 {
2722 }
2725 }
2727 }
2731 }
2734 {
2742 }
2743 }
2745 /* Return 1 if target is one of ours. */
2747 static bfd_boolean
2749 {
2757 }
2759 /* Hook called by the linker routine which adds symbols from an object
2760 file. We use it to put .comm items in .sbss, and not .bss. */
2762 static bfd_boolean
2770 {
2775 {
2776 /* Common symbols less than or equal to -G nn bytes are automatically
2777 put into .sbss. */
2782 {
2790 flags);
2793 }
2797 }
2800 }
2801 \f
2802 static bfd_boolean
2805 {
2814 }
2816 /* Create a special linker section. */
2818 static bfd_boolean
2821 flagword flags,
2823 {
2830 /* Record the first bfd that needs the special sections. */
2836 flags);
2843 }
2845 /* Find a linker generated pointer with a given addend and type. */
2848 elf_find_pointer_linker_section
2850 bfd_vma addend,
2852 {
2858 }
2860 /* Allocate a pointer to live in a linker created section. */
2862 static bfd_boolean
2867 {
2871 bfd_size_type amt;
2875 /* Is this a global symbol? */
2877 {
2880 /* Has this symbol already been allocated? If so, our work is done. */
2884 lsect))
2888 }
2889 else
2890 {
2891 /* Allocation of a pointer to a local symbol. */
2894 /* Allocate a table to hold the local symbols if first time. */
2896 {
2907 }
2909 /* Has this symbol already been allocated? If so, our work is done. */
2912 lsect))
2916 }
2918 /* Allocate space for a pointer in the linker section, and allocate
2919 a new pointer record from internal memory. */
2935 #ifdef DEBUG
2940 #endif
2943 }
2945 static bfd_boolean
2950 {
2955 {
2963 }
2969 }
2971 static bfd_boolean
2974 {
2983 {
2993 }
2996 }
3000 {
3009 }
3011 static void
3013 {
3016 abfd,
3019 }
3021 /* Look through the relocs for a section during the first phase, and
3022 allocate space in the global offset table or procedure linkage
3023 table. */
3025 static bfd_boolean
3030 {
3041 /* Don't do anything special with non-loaded, non-alloced sections.
3042 In particular, any relocs in such sections should not affect GOT
3043 and PLT reference counting (ie. we don't allow them to create GOT
3044 or PLT entries), there's no possibility or desire to optimize TLS
3045 relocs, and there's not much point in propagating relocs to shared
3046 libs that the dynamic linker won't relocate. */
3050 #ifdef DEBUG
3053 #endif
3055 /* Initialize howto table if not already done. */
3067 {
3076 else
3077 {
3082 }
3084 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
3085 This shows up in particular in an R_PPC_ADDR32 in the eabi
3086 startup code. */
3090 {
3096 }
3100 {
3130 dogottls:
3132 /* Fall thru */
3134 /* GOT16 relocations */
3139 /* This symbol requires a global offset table entry. */
3141 {
3146 }
3148 {
3151 }
3152 else
3153 /* This is a global offset table entry for a local symbol. */
3158 /* Indirect .sdata relocation. */
3161 {
3164 }
3173 {
3176 }
3179 /* Indirect .sdata2 relocation. */
3182 {
3185 }
3194 {
3197 }
3202 {
3205 }
3210 {
3213 }
3218 {
3221 }
3226 {
3229 }
3235 {
3238 }
3246 {
3249 }
3258 {
3261 }
3272 #ifdef DEBUG
3274 #endif
3275 /* This symbol requires a procedure linkage table entry. We
3276 actually build the entry in finish_dynamic_symbol,
3277 because this might be a case of linking PIC code without
3278 linking in any dynamic objects, in which case we don't
3279 need to generate a procedure linkage table after all. */
3282 {
3283 /* It does not make sense to have a procedure linkage
3284 table entry for a local symbol. */
3287 abfd,
3288 sec,
3293 }
3294 else
3295 {
3301 }
3304 /* The following relocations don't need to propagate the
3305 relocation if linking a shared object since they are
3306 section relative. */
3325 /* These are just markers. */
3332 /* These should only appear in dynamic objects. */
3339 /* These aren't handled yet. We'll report an error later. */
3348 /* This refers only to functions defined in the shared library. */
3354 /* This relocation describes the C++ object vtable hierarchy.
3355 Reconstruct it for later use during GC. */
3361 /* This relocation describes which C++ vtable entries are actually
3362 used. Record for later use during GC. */
3368 /* We shouldn't really be seeing these. */
3374 /* Nor these. */
3393 {
3394 /* Old -fPIC gcc code has .long LCTOC1-LCFx just before
3395 the start of a function, which assembles to a REL32
3396 reference to .got2. If we detect one of these, then
3397 force the old PLT layout because the linker cannot
3398 reliably deduce the GOT pointer value needed for
3399 PLT call stubs. */
3403 r_symndx);
3406 }
3418 {
3422 }
3423 /* fall through */
3436 dodyn1:
3438 {
3439 /* We may need a plt entry if the symbol turns out to be
3440 a function defined in a dynamic object. */
3444 /* We may need a copy reloc too. */
3446 }
3448 dodyn:
3449 /* If we are creating a shared library, and this is a reloc
3450 against a global symbol, or a non PC relative reloc
3451 against a local symbol, then we need to copy the reloc
3452 into the shared library. However, if we are linking with
3453 -Bsymbolic, we do not need to copy a reloc against a
3454 global symbol which is defined in an object we are
3455 including in the link (i.e., DEF_REGULAR is set). At
3456 this point we have not seen all the input files, so it is
3457 possible that DEF_REGULAR is not set now but will be set
3458 later (it is never cleared). In case of a weak definition,
3459 DEF_REGULAR may be cleared later by a strong definition in
3460 a shared library. We account for that possibility below by
3461 storing information in the dyn_relocs field of the hash
3462 table entry. A similar situation occurs when creating
3463 shared libraries and symbol visibility changes render the
3464 symbol local.
3466 If on the other hand, we are creating an executable, we
3467 may need to keep relocations for symbols satisfied by a
3468 dynamic library if we manage to avoid copy relocs for the
3469 symbol. */
3476 || (ELIMINATE_COPY_RELOCS
3481 {
3485 #ifdef DEBUG
3487 "ppc_elf_check_relocs needs to "
3491 #endif
3493 {
3496 name = (bfd_elf_string_from_elf_section
3511 {
3512 flagword flags;
3518 name,
3519 flags);
3524 }
3526 }
3528 /* If this is a global symbol, we count the number of
3529 relocations we need for this symbol. */
3531 {
3533 }
3534 else
3535 {
3536 /* Track dynamic relocs needed for local syms too.
3537 We really need local syms available to do this
3538 easily. Oh well. */
3550 }
3554 {
3563 }
3568 }
3571 }
3572 }
3575 }
3576 \f
3577 /* Merge backend specific data from an object file to the output
3578 object file when linking. */
3580 static bfd_boolean
3582 {
3583 flagword old_flags;
3584 flagword new_flags;
3585 bfd_boolean error;
3591 /* Check if we have the same endianess. */
3598 {
3599 /* First call, no flags set. */
3602 }
3604 /* Compatible flags are ok. */
3606 ;
3608 /* Incompatible flags. */
3609 else
3610 {
3611 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
3612 to be linked with either. */
3616 {
3621 }
3624 {
3629 }
3631 /* The output is -mrelocatable-lib iff both the input files are. */
3635 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
3636 but each input file is either -mrelocatable or -mrelocatable-lib. */
3642 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
3643 any module uses it. */
3649 /* Warn about any other mismatches. */
3651 {
3657 }
3660 {
3663 }
3664 }
3667 }
3668 \f
3669 /* Choose which PLT scheme to use, and set .plt flags appropriately.
3670 Returns -1 on error, 0 for old PLT, 1 for new PLT. */
3671 int
3676 {
3678 flagword flags;
3691 {
3695 /* The new PLT is a loaded section. */
3700 /* The new GOT is not executable. */
3704 }
3705 else
3706 {
3707 /* Stop an unused .glink section from affecting .text alignment. */
3711 }
3713 }
3714 \f
3715 /* Return the section that should be marked against GC for a given
3716 relocation. */
3724 {
3727 {
3731 }
3734 }
3736 /* Update the got, plt and dynamic reloc reference counts for the
3737 section being removed. */
3739 static bfd_boolean
3744 {
3765 {
3772 {
3784 {
3785 /* Everything must go for SEC. */
3788 }
3789 }
3793 {
3799 /* Fall thru */
3818 {
3821 }
3823 {
3826 }
3836 /* Fall thru */
3859 {
3864 }
3869 }
3870 }
3872 }
3873 \f
3874 /* Set htab->tls_get_addr and call the generic ELF tls_setup function. */
3876 asection *
3878 {
3885 {
3888 }
3893 }
3895 /* Run through all the TLS relocs looking for optimization
3896 opportunities. */
3898 bfd_boolean
3901 {
3911 {
3917 {
3921 /* Read the relocations. */
3930 {
3936 bfd_boolean is_local;
3940 {
3948 }
3957 {
3962 /* These relocs should never be against a symbol
3963 defined in a shared lib. Leave them alone if
3964 that turns out to be the case. */
3970 /* LD -> LE */
3981 /* GD -> LE */
3983 else
3984 /* GD -> IE */
3996 {
3997 /* IE -> LE */
4001 }
4002 else
4012 {
4016 }
4023 }
4026 {
4028 {
4029 /* We managed to get rid of a got entry. */
4032 }
4034 }
4035 else
4036 {
4042 {
4049 {
4053 }
4054 }
4060 {
4061 /* We managed to get rid of a got entry. */
4064 }
4067 }
4071 }
4075 }
4079 {
4082 else
4084 }
4085 }
4087 }
4088 \f
4089 /* Adjust a symbol defined by a dynamic object and referenced by a
4090 regular object. The current definition is in some section of the
4091 dynamic object, but we're not including those sections. We have to
4092 change the definition to something the rest of the link can
4093 understand. */
4095 static bfd_boolean
4098 {
4103 #ifdef DEBUG
4106 #endif
4108 /* Make sure we know what is going on here. */
4117 /* Deal with function syms. */
4120 {
4121 /* Clear procedure linkage table information for any symbol that
4122 won't need a .plt entry. */
4131 {
4132 /* A PLT entry is not required/allowed when:
4134 1. We are not using ld.so; because then the PLT entry
4135 can't be set up, so we can't use one. In this case,
4136 ppc_elf_adjust_dynamic_symbol won't even be called.
4138 2. GC has rendered the entry unused.
4140 3. We know for certain that a call to this symbol
4141 will go to this object, or will remain undefined. */
4144 }
4146 }
4147 else
4150 /* If this is a weak symbol, and there is a real definition, the
4151 processor independent code will have arranged for us to see the
4152 real definition first, and we can just use the same value. */
4154 {
4162 }
4164 /* This is a reference to a symbol defined by a dynamic object which
4165 is not a function. */
4167 /* If we are creating a shared library, we must presume that the
4168 only references to the symbol are via the global offset table.
4169 For such cases we need not do anything here; the relocations will
4170 be handled correctly by relocate_section. */
4174 /* If there are no references to this symbol that do not use the
4175 GOT, we don't need to generate a copy reloc. */
4179 /* If we didn't find any dynamic relocs in read-only sections, then we'll
4180 be keeping the dynamic relocs and avoiding the copy reloc. We can't
4181 do this if there are any small data relocations. */
4184 {
4187 {
4191 }
4194 {
4197 }
4198 }
4201 {
4205 }
4207 /* We must allocate the symbol in our .dynbss section, which will
4208 become part of the .bss section of the executable. There will be
4209 an entry for this symbol in the .dynsym section. The dynamic
4210 object will contain position independent code, so all references
4211 from the dynamic object to this symbol will go through the global
4212 offset table. The dynamic linker will use the .dynsym entry to
4213 determine the address it must put in the global offset table, so
4214 both the dynamic object and the regular object will refer to the
4215 same memory location for the variable.
4217 Of course, if the symbol is referenced using SDAREL relocs, we
4218 must instead allocate it in .sbss. */
4222 else
4226 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
4227 copy the initial value out of the dynamic object and into the
4228 runtime process image. We need to remember the offset into the
4229 .rela.bss section we are going to use. */
4231 {
4236 else
4241 }
4243 /* We need to figure out the alignment required for this symbol. I
4244 have no idea how ELF linkers handle this. */
4249 /* Apply the required alignment. */
4252 {
4255 }
4257 /* Define the symbol as being at this point in the section. */
4261 /* Increment the section size to make room for the symbol. */
4265 }
4266 \f
4267 /* Generate a symbol to mark plt call stubs. For non-PIC code the sym is
4268 xxxxxxxx.plt_call32.<callee> where xxxxxxxx is a hex number, usually 0,
4269 specifying the addend on the plt relocation. For -fpic code, the sym
4270 is xxxxxxxx.plt_pic32.<callee>, and for -fPIC
4271 xxxxxxxx.got2.plt_pic32.<callee>. */
4273 static bfd_boolean
4277 {
4286 else
4306 {
4315 }
4317 }
4319 /* Allocate NEED contiguous space in .got, and return the offset.
4320 Handles allocation of the got header when crossing 32k. */
4322 static bfd_vma
4324 {
4325 bfd_vma where;
4329 {
4332 }
4333 else
4334 {
4337 {
4340 }
4341 else
4342 {
4345 {
4348 }
4351 }
4352 }
4354 }
4356 /* Allocate space in associated reloc sections for dynamic relocs. */
4358 static bfd_boolean
4360 {
4370 /* When warning symbols are created, they **replace** the "real"
4371 entry in the hash table, thus we never get to see the real
4372 symbol in a hash traversal. So look at it now. */
4377 {
4384 {
4385 /* Make sure this symbol is output as a dynamic symbol. */
4388 {
4391 }
4395 {
4399 {
4401 {
4404 }
4409 {
4412 }
4416 {
4419 }
4425 }
4426 else
4427 {
4429 {
4430 /* If this is the first .plt entry, make room
4431 for the special first entry. */
4435 /* The PowerPC PLT is actually composed of two
4436 parts, the first part is 2 words (for a load
4437 and a jump), and then there is a remaining
4438 word available at the end. */
4445 /* If this symbol is not defined in a regular
4446 file, and we are not generating a shared
4447 library, then set the symbol to this location
4448 in the .plt. This is required to make
4449 function pointers compare as equal between
4450 the normal executable and the shared library. */
4453 {
4456 }
4458 /* Make room for this entry. */
4460 /* After the 8192nd entry, room for two entries
4461 is allocated. */
4467 }
4469 }
4471 /* We also need to make an entry in the .rela.plt section. */
4473 {
4477 {
4478 /* Allocate space for the unloaded relocations. */
4480 {
4483 {
4487 }
4492 }
4494 /* Every PLT entry has an associated GOT entry in
4495 .got.plt. */
4497 }
4499 }
4500 }
4501 else
4503 }
4504 else
4508 {
4511 }
4512 }
4513 else
4514 {
4517 }
4521 {
4522 /* Make sure this symbol is output as a dynamic symbol. */
4525 {
4528 }
4532 /* If just an LD reloc, we'll just use htab->tlsld_got.offset. */
4534 else
4535 {
4536 bfd_boolean dyn;
4539 {
4548 }
4549 else
4557 {
4558 /* All the entries we allocated need relocs.
4559 Except LD only needs one. */
4563 }
4564 }
4565 }
4566 else
4572 /* In the shared -Bsymbolic case, discard space allocated for
4573 dynamic pc-relative relocs against symbols which turn out to be
4574 defined in regular objects. For the normal shared case, discard
4575 space for relocs that have become local due to symbol visibility
4576 changes. */
4579 {
4580 /* Relocs that use pc_count are those that appear on a call insn,
4581 or certain REL relocs (see MUST_BE_DYN_RELOC) that can be
4582 generated via assembly. We want calls to protected symbols to
4583 resolve directly to the function rather than going via the plt.
4584 If people want function pointer comparisons to work as expected
4585 then they should avoid writing weird assembly. */
4587 {
4591 {
4596 else
4598 }
4599 }
4601 /* Also discard relocs on undefined weak syms with non-default
4602 visibility. */
4605 {
4609 /* Make sure undefined weak symbols are output as a dynamic
4610 symbol in PIEs. */
4613 {
4616 }
4617 }
4618 }
4620 {
4621 /* For the non-shared case, discard space for relocs against
4622 symbols which turn out to need copy relocs or are not
4623 dynamic. */
4628 {
4629 /* Make sure this symbol is output as a dynamic symbol.
4630 Undefined weak syms won't yet be marked as dynamic. */
4633 {
4636 }
4638 /* If that succeeded, we know we'll be keeping all the
4639 relocs. */
4642 }
4646 keep: ;
4647 }
4649 /* Finally, allocate space. */
4651 {
4654 }
4657 }
4659 /* Find any dynamic relocs that apply to read-only sections. */
4661 static bfd_boolean
4663 {
4673 {
4679 {
4682 /* Not an error, just cut short the traversal. */
4684 }
4685 }
4687 }
4689 /* Set the sizes of the dynamic sections. */
4691 static bfd_boolean
4694 {
4697 bfd_boolean relocs;
4700 #ifdef DEBUG
4702 #endif
4708 {
4709 /* Set the contents of the .interp section to the interpreter. */
4711 {
4716 }
4717 }
4724 /* Set up .got offsets for local syms, and space for local dynamic
4725 relocs. */
4727 {
4731 bfd_size_type locsymcount;
4738 {
4745 {
4748 {
4749 /* Input section has been discarded, either because
4750 it is a copy of a linkonce section or due to
4751 linker script /DISCARD/, so we'll be discarding
4752 the relocs too. */
4753 }
4755 {
4762 }
4763 }
4764 }
4776 {
4778 {
4779 /* If just an LD reloc, we'll just use
4780 htab->tlsld_got.offset. */
4783 }
4784 else
4785 {
4788 {
4795 }
4796 else
4802 }
4803 }
4804 else
4806 }
4809 {
4813 }
4814 else
4817 /* Allocate space for global sym dynamic relocs. */
4821 {
4824 /* If we haven't allocated the header, do so now. When we get here,
4825 for old plt/got the got size will be 0 to 32764 (not allocated),
4826 or 32780 to 65536 (header allocated). For new plt/got, the
4827 corresponding ranges are 0 to 32768 and 32780 to 65536. */
4829 {
4834 }
4837 }
4840 {
4842 /* Space for the branch table. */
4844 /* Pad out to align the start of PLTresolve. */
4849 {
4856 {
4865 }
4871 {
4880 }
4881 }
4882 }
4884 /* We've now determined the sizes of the various dynamic sections.
4885 Allocate memory for them. */
4888 {
4901 {
4902 /* We'd like to strip these sections if they aren't needed, but if
4903 we've exported dynamic symbols from them we must leave them.
4904 It's too late to tell BFD to get rid of the symbols. */
4907 /* Strip this section if we don't need it; see the
4908 comment below. */
4909 }
4912 {
4913 /* Strip these too. */
4914 }
4916 {
4918 {
4919 /* Remember whether there are any relocation sections. */
4922 /* We use the reloc_count field as a counter if we need
4923 to copy relocs into the output file. */
4925 }
4926 }
4927 else
4928 {
4929 /* It's not one of our sections, so don't allocate space. */
4931 }
4934 {
4935 /* If we don't need this section, strip it from the
4936 output file. This is mostly to handle .rela.bss and
4937 .rela.plt. We must create both sections in
4938 create_dynamic_sections, because they must be created
4939 before the linker maps input sections to output
4940 sections. The linker does that before
4941 adjust_dynamic_symbol is called, and it is that
4942 function which decides whether anything needs to go
4943 into these sections. */
4946 }
4951 /* Allocate memory for the section contents. */
4955 }
4958 {
4959 /* Add some entries to the .dynamic section. We fill in the
4960 values later, in ppc_elf_finish_dynamic_sections, but we
4961 must add the entries now so that we get the correct size for
4962 the .dynamic section. The DT_DEBUG entry is filled in by the
4963 dynamic linker and used by the debugger. */
4964 #define add_dynamic_entry(TAG, VAL) \
4965 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
4968 {
4971 }
4974 {
4980 }
4983 {
4986 }
4989 {
4994 }
4996 /* If any dynamic relocs apply to a read-only section, then we
4997 need a DT_TEXTREL entry. */
5000 info);
5003 {
5006 }
5007 }
5008 #undef add_dynamic_entry
5011 }
5012 \f
5013 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
5016 {
5025 };
5028 {
5033 };
5035 static bfd_boolean
5040 {
5041 struct one_fixup
5042 {
5045 bfd_vma toff;
5046 bfd_vma trampoff;
5047 };
5055 bfd_boolean changed;
5057 bfd_size_type trampoff;
5062 /* Nothing to do if there are no relocations, and no need to do
5063 anything with non-alloc sections. */
5070 /* Space for a branch around any trampolines. */
5075 /* Get a copy of the native relocations. */
5086 {
5098 {
5113 }
5115 /* Get the value of the symbol referred to by the reloc. */
5117 {
5118 /* A local symbol. */
5121 /* Read this BFD's local symbols. */
5123 {
5131 }
5139 else
5144 }
5145 else
5146 {
5147 /* Global symbol handling. */
5162 {
5166 {
5168 {
5171 }
5172 else
5173 {
5176 }
5177 }
5178 }
5180 ;
5183 {
5186 }
5187 else
5191 }
5193 /* If the branch and target are in the same section, you have
5194 no hope of adding stubs. We'll error out later should the
5195 branch overflow. */
5199 /* There probably isn't any reason to handle symbols in
5200 SEC_MERGE sections; SEC_MERGE doesn't seem a likely
5201 attribute for a code section, and we are only looking at
5202 branches. However, implement it correctly here as a
5203 reference for other target relax_section functions. */
5205 {
5206 /* At this stage in linking, no SEC_MERGE symbol has been
5207 adjusted, so all references to such symbols need to be
5208 passed through _bfd_merged_section_offset. (Later, in
5209 relocate_section, all SEC_MERGE symbols *except* for
5210 section symbols have been adjusted.)
5212 gas may reduce relocations against symbols in SEC_MERGE
5213 sections to a relocation against the section symbol when
5214 the original addend was zero. When the reloc is against
5215 a section symbol we should include the addend in the
5216 offset passed to _bfd_merged_section_offset, since the
5217 location of interest is the original symbol. On the
5218 other hand, an access to "sym+addend" where "sym" is not
5219 a section symbol should not include the addend; Such an
5220 access is presumed to be an offset from "sym"; The
5221 location of interest is just "sym". */
5227 toff);
5231 }
5232 /* PLTREL24 addends are special. */
5236 /* Attempted -shared link of non-pic code loses. */
5245 /* If the branch is in range, no need to do anything. */
5249 /* Look for an existing fixup to this address. */
5255 {
5261 /* Oh dear, we can't reach a trampoline. Don't try to add
5262 one. We'll report an error later. */
5266 {
5270 }
5271 else
5272 {
5276 }
5285 /* Hijack the old relocation. Since we need two
5286 relocations for this use a "composite" reloc. */
5288 stub_rtype);
5291 /* Record the fixup so we don't do it again this section. */
5300 }
5301 else
5302 {
5307 /* Nop out the reloc, since we're finalizing things here. */
5309 }
5311 /* Get the section contents. */
5313 {
5314 /* Get cached copy if it exists. */
5317 else
5318 {
5319 /* Go get them off disk. */
5322 }
5323 }
5325 /* Fix up the existing branch to hit the trampoline. */
5328 {
5346 }
5347 }
5349 /* Write out the trampolines. */
5352 {
5355 bfd_vma val;
5358 do
5359 {
5363 }
5371 /* Branch around the trampolines. */
5379 {
5382 }
5383 else
5384 {
5387 }
5391 {
5393 i++;
5397 }
5399 }
5403 {
5406 else
5407 {
5408 /* Cache the symbols for elf_link_input_bfd. */
5410 }
5411 }
5415 {
5418 else
5419 {
5420 /* Cache the section contents for elf_link_input_bfd. */
5422 }
5423 }
5426 {
5429 else
5431 }
5436 error_return:
5446 }
5447 \f
5448 /* What to do when ld finds relocations against symbols defined in
5449 discarded sections. */
5451 static unsigned int
5453 {
5461 }
5462 \f
5463 /* Fill in the address for a pointer generated in a linker section. */
5465 static bfd_vma
5469 bfd_vma relocation,
5471 {
5477 {
5478 /* Handle global symbol. */
5484 }
5485 else
5486 {
5487 /* Handle local symbol. */
5492 }
5496 lsect);
5499 /* Offset will always be a multiple of four, so use the bottom bit
5500 as a "written" flag. */
5502 {
5507 }
5513 #ifdef DEBUG
5517 #endif
5519 /* Subtract out the addend, because it will get added back in by the normal
5520 processing. */
5522 }
5524 /* The RELOCATE_SECTION function is called by the ELF backend linker
5525 to handle the relocations for a section.
5527 The relocs are always passed as Rela structures; if the section
5528 actually uses Rel structures, the r_addend field will always be
5529 zero.
5531 This function is responsible for adjust the section contents as
5532 necessary, and (if using Rela relocs and generating a
5533 relocatable output file) adjusting the reloc addend as
5534 necessary.
5536 This function does not have to worry about setting the reloc
5537 address or the reloc symbol index.
5539 LOCAL_SYMS is a pointer to the swapped in local symbols.
5541 LOCAL_SECTIONS is an array giving the section in the input file
5542 corresponding to the st_shndx field of each local symbol.
5544 The global hash table entry for the global symbols can be found
5545 via elf_sym_hashes (input_bfd).
5547 When generating relocatable output, this function must handle
5548 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
5549 going to be the section symbol corresponding to the output
5550 section, which means that the addend must be adjusted
5551 accordingly. */
5553 static bfd_boolean
5562 {
5568 Elf_Internal_Rela outrel;
5575 #ifdef DEBUG
5581 #endif
5585 /* Initialize howto table if not already done. */
5596 {
5598 bfd_vma addend;
5599 bfd_reloc_status_type r;
5606 bfd_vma relocation;
5608 bfd_boolean unresolved_reloc;
5609 bfd_boolean warned;
5621 {
5627 }
5628 else
5629 {
5636 }
5639 {
5640 /* For relocs against symbols from removed linkonce sections,
5641 or sections discarded by a linker script, we just want the
5642 section contents zeroed. Avoid any special processing. */
5650 }
5653 {
5657 {
5658 /* R_PPC_PLTREL24 is rather special. If non-zero, the
5659 addend specifies the GOT pointer offset within .got2. */
5661 }
5663 }
5665 /* TLS optimizations. Replace instruction sequences and relocs
5666 based on information we collected in tls_optimize. We edit
5667 RELOCS so that --emit-relocs will output something sensible
5668 for the final instruction stream. */
5672 {
5676 {
5680 }
5681 }
5683 /* Ensure reloc mapping code below stays sane. */
5694 {
5702 {
5703 bfd_vma insn;
5710 }
5716 {
5725 else
5728 /* add -> addi. */
5734 /* load and store indexed -> dform. */
5738 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
5743 /* lwax -> lwa. */
5745 else
5752 /* Was PPC_TLS which sits on insn boundary, now
5753 PPC_TPREL16_LO which is at low-order half-word. */
5755 }
5768 {
5769 tls_gdld_hi:
5773 else
5774 {
5778 }
5780 }
5793 {
5794 tls_get_addr_check:
5796 {
5801 bfd_vma offset;
5803 /* The next instruction should be a call to
5804 __tls_get_addr. Peek at the reloc to be sure. */
5822 /* OK, it checks out. Replace the call. */
5827 {
5828 /* IE */
5837 }
5838 else
5839 {
5840 /* LE */
5844 {
5845 /* Was an LD reloc. */
5848 }
5852 R_PPC_TPREL16_LO);
5855 }
5859 {
5860 /* We changed the symbol on an LD reloc. Start over
5861 in order to get h, sym, sec etc. right. */
5862 rel--;
5864 }
5865 }
5866 }
5868 }
5870 /* Handle other relocations that tweak non-addend part of insn. */
5873 {
5877 /* Branch taken prediction relocations. */
5881 /* Fall thru */
5883 /* Branch not taken prediction relocations. */
5894 /* Invert 'y' bit if not the default. */
5900 }
5908 {
5925 /* GOT16 relocations. Like an ADDR16 using the symbol's
5926 address in the GOT as relocation value instead of the
5927 symbol's value itself. Also, create a GOT entry for the
5928 symbol and put the symbol value there. */
5961 dogot:
5962 {
5963 /* Relocation is to the entry for this symbol in the global
5964 offset table. */
5965 bfd_vma off;
5978 {
5979 bfd_boolean dyn;
5984 /* This is actually a static link, or it is a
5985 -Bsymbolic link and the symbol is defined
5986 locally, or the symbol was forced to be local
5987 because of a version file. */
5988 ;
5989 else
5990 {
5993 }
5995 }
5996 else
5997 {
6001 }
6003 /* The offset must always be a multiple of 4. We use the
6004 least significant bit to record whether we have already
6005 processed this entry. */
6009 else
6010 {
6021 /* We might have multiple got entries for this sym.
6022 Initialize them all. */
6023 do
6024 {
6028 {
6031 }
6033 {
6036 }
6038 {
6041 }
6043 {
6046 }
6048 /* Generate relocs for the dynamic linker. */
6053 {
6059 {
6062 {
6069 outrel.r_info
6071 }
6072 }
6079 else
6082 {
6086 }
6091 }
6093 /* Init the .got section contents if we're not
6094 emitting a reloc. */
6095 else
6096 {
6102 {
6108 {
6112 }
6113 }
6116 }
6121 }
6126 }
6132 {
6134 {
6140 {
6144 {
6147 }
6148 }
6149 }
6150 }
6155 /* Addends on got relocations don't make much sense.
6156 x+off@got is actually x@got+off, and since the got is
6157 generated by a hash table traversal, the value in the
6158 got at entry m+n bears little relation to the entry m. */
6162 input_bfd,
6163 input_section,
6166 sym_name);
6167 }
6170 /* Relocations that need no special processing. */
6172 /* It makes no sense to point a local relocation
6173 at a symbol not in this object. */
6175 {
6178 input_bfd,
6179 input_section,
6181 TRUE))
6184 }
6194 /* Relocations that may need to be propagated if this is a shared
6195 object. */
6201 /* The TPREL16 relocs shouldn't really be used in shared
6202 libs as they will result in DT_TEXTREL being set, but
6203 support them anyway. */
6230 /* If these relocations are not to a named symbol, they can be
6231 handled right here, no need to bother the dynamic linker. */
6235 /* fall through */
6237 /* Relocations that always need to be propagated if this is a shared
6238 object. */
6250 dodyn:
6253 /* Fall thru. */
6261 || (ELIMINATE_COPY_RELOCS
6268 {
6271 #ifdef DEBUG
6276 #endif
6278 /* When generating a shared object, these relocations
6279 are copied into the output file to be resolved at run
6280 time. */
6282 {
6285 name = (bfd_elf_string_from_elf_section
6294 input_section),
6299 }
6315 {
6319 }
6320 else
6321 {
6326 else
6327 {
6333 {
6336 }
6337 else
6338 {
6341 /* We are turning this relocation into one
6342 against a section symbol. It would be
6343 proper to subtract the symbol's value,
6344 osec->vma, from the emitted reloc addend,
6345 but ld.so expects buggy relocs. */
6349 {
6352 }
6354 #ifdef DEBUG
6359 #endif
6360 }
6363 }
6364 }
6373 /* This reloc will be computed at runtime. We clear the memory
6374 so that it contains predictable value. */
6378 {
6382 }
6383 }
6388 {
6395 else
6400 }
6403 /* Fall thru */
6409 /* Fall thru */
6412 relax32:
6413 {
6420 /* We're clearing the bits for R_PPC_ADDR16_HA
6421 and R_PPC_ADDR16_LO here. */
6425 /* t0 is HA, t1 is LO */
6432 }
6435 /* Indirect .sdata relocation. */
6438 relocation
6443 /* Indirect .sdata2 relocation. */
6446 relocation
6451 /* Handle the TOC16 reloc. We want to use the offset within the .got
6452 section, not the actual VMA. This is appropriate when generating
6453 an embedded ELF object, for which the .got section acts like the
6454 AIX .toc section. */
6465 /* Relocation is to the entry for this symbol in the
6466 procedure linkage table. */
6467 {
6473 {
6474 /* We didn't make a PLT entry for this symbol. This
6475 happens when statically linking PIC code, or when
6476 using -Bsymbolic. */
6478 }
6485 else
6489 }
6492 /* Relocate against _SDA_BASE_. */
6494 {
6504 {
6508 input_bfd,
6509 sym_name,
6511 name);
6512 }
6517 }
6520 /* Relocate against _SDA2_BASE_. */
6522 {
6530 {
6534 input_bfd,
6535 sym_name,
6537 name);
6542 }
6547 }
6550 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
6553 {
6564 {
6570 }
6574 {
6580 }
6584 {
6586 }
6588 else
6589 {
6593 input_bfd,
6594 sym_name,
6596 name);
6601 }
6608 }
6609 }
6612 /* Relocate against the beginning of the section. */
6621 /* Negative relocations. */
6647 input_bfd,
6649 sym_name);
6654 }
6656 /* Do any further special processing. */
6658 {
6669 /* It's just possible that this symbol is a weak symbol
6670 that's not actually defined anywhere. In that case,
6671 'sec' would be NULL, and we should leave the symbol
6672 alone (it will be set to zero elsewhere in the link). */
6675 /* Fall thru */
6683 /* Add 0x10000 if sign bit in 0:15 is set.
6684 Bits 0:15 are not used. */
6687 }
6689 #ifdef DEBUG
6694 sym_name,
6695 r_symndx,
6698 #endif
6703 {
6706 input_bfd,
6707 input_section,
6710 sym_name);
6712 }
6715 input_bfd,
6716 input_section,
6717 contents,
6719 relocation,
6720 addend);
6723 {
6725 {
6731 {
6732 /* Assume this is a call protected by other code that
6733 detect the symbol is undefined. If this is the case,
6734 we can safely ignore the overflow. If not, the
6735 program is hosed anyway, and a little warning isn't
6736 going to help. */
6739 }
6743 sym_name,
6746 input_bfd,
6747 input_section,
6750 }
6751 else
6752 {
6758 }
6759 }
6760 }
6762 #ifdef DEBUG
6764 #endif
6767 }
6768 \f
6769 #define PPC_LO(v) ((v) & 0xffff)
6770 #define PPC_HI(v) (((v) >> 16) & 0xffff)
6771 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
6773 /* Finish up dynamic symbol handling. We set the contents of various
6774 dynamic sections here. */
6776 static bfd_boolean
6781 {
6784 bfd_boolean doneone;
6786 #ifdef DEBUG
6789 #endif
6797 {
6799 {
6800 Elf_Internal_Rela rela;
6802 bfd_vma reloc_index;
6806 else
6807 {
6813 }
6815 /* This symbol has an entry in the procedure linkage table.
6816 Set it up. */
6818 {
6819 bfd_vma got_offset;
6822 /* The first three entries in .got.plt are reserved. */
6825 /* Use the right PLT. */
6829 /* Fill in the .plt on VxWorks. */
6831 {
6841 }
6842 else
6843 {
6844 bfd_vma got_loc
6845 = (got_offset
6858 }
6865 /* This instruction is an immediate load. The value loaded is
6866 the byte offset of the R_PPC_JMP_SLOT relocation from the
6867 start of the .rela.plt section. The value is stored in the
6868 low-order 16 bits of the load instruction. */
6869 /* NOTE: It appears that this is now an index rather than a
6870 prescaled offset. */
6874 /* This instruction is a PC-relative branch whose target is
6875 the start of the PLT section. The address of this branch
6876 instruction is 20 bytes beyond the start of this PLT entry.
6877 The address is encoded in bits 6-29, inclusive. The value
6878 stored is right-shifted by two bits, permitting a 26-bit
6879 offset. */
6889 /* Fill in the GOT entry corresponding to this PLT slot with
6890 the address immediately after the the "bctr" instruction
6891 in this PLT entry. */
6898 {
6899 /* Fill in a couple of entries in .rela.plt.unloaded. */
6905 /* Provide the @ha relocation for the first instruction. */
6910 R_PPC_ADDR16_HA);
6915 /* Provide the @l relocation for the second instruction. */
6920 R_PPC_ADDR16_LO);
6925 /* Provide a relocation for the GOT entry corresponding to this
6926 PLT slot. Point it at the middle of the .plt entry. */
6931 R_PPC_ADDR32);
6934 }
6936 /* VxWorks uses non-standard semantics for R_PPC_JMP_SLOT.
6937 In particular, the offset for the relocation is not the
6938 address of the PLT entry for this function, as specified
6939 by the ABI. Instead, the offset is set to the address of
6940 the GOT slot for this function. See EABI 4.4.4.1. */
6945 }
6946 else
6947 {
6952 {
6953 /* We don't need to fill in the .plt. The ppc dynamic
6954 linker will fill it in. */
6955 }
6956 else
6957 {
6963 }
6964 }
6966 /* Fill in the entry in the .rela.plt section. */
6975 {
6976 /* Mark the symbol as undefined, rather than as defined in
6977 the .plt section. Leave the value alone. */
6979 /* If the symbol is weak, we do need to clear the value.
6980 Otherwise, the PLT entry would provide a definition for
6981 the symbol even if the symbol wasn't defined anywhere,
6982 and so the symbol would never be NULL. */
6985 }
6987 }
6990 {
6991 bfd_vma plt;
7000 {
7015 {
7024 }
7025 else
7026 {
7035 }
7036 }
7037 else
7038 {
7048 /* We only need one non-PIC glink stub. */
7050 }
7051 }
7052 else
7054 }
7057 {
7059 Elf_Internal_Rela rela;
7062 /* This symbols needs a copy reloc. Set it up. */
7064 #ifdef DEBUG
7066 #endif
7072 else
7083 }
7085 #ifdef DEBUG
7087 #endif
7089 /* Mark some specially defined symbols as absolute. */
7098 }
7099 \f
7100 static enum elf_reloc_type_class
7102 {
7104 {
7115 }
7116 }
7117 \f
7118 /* Finish up the dynamic sections. */
7120 static bfd_boolean
7123 {
7127 bfd_vma got;
7130 #ifdef DEBUG
7132 #endif
7139 else
7149 {
7157 {
7158 Elf_Internal_Dyn dyn;
7164 {
7168 else
7188 {
7192 }
7197 }
7200 }
7201 }
7203 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
7204 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
7206 {
7208 bfd_vma val;
7220 }
7222 /* Fill in the first entry in the VxWorks procedure linkage table. */
7224 {
7225 /* Use the right PLT. */
7231 {
7232 bfd_vma got_value =
7242 }
7243 else
7244 {
7247 }
7256 {
7257 Elf_Internal_Rela rela;
7262 /* Output the @ha relocation for the first instruction. */
7271 /* Output the @l relocation for the second instruction. */
7280 /* Fix up the remaining relocations. They may have the wrong
7281 symbol index for _G_O_T_ or _P_L_T_ depending on the order
7282 in which symbols were output. */
7284 {
7285 Elf_Internal_Rela rel;
7301 }
7302 }
7303 }
7306 {
7309 bfd_vma res0;
7312 /*
7313 * PIC glink code is the following:
7314 *
7315 * # ith PLT code stub.
7316 * addis 11,30,(plt+(i-1)*4-got)@ha
7317 * lwz 11,(plt+(i-1)*4-got)@l(11)
7318 * mtctr 11
7319 * bctr
7320 *
7321 * # A table of branches, one for each plt entry.
7322 * # The idea is that the plt call stub loads ctr (and r11) with these
7323 * # addresses, so (r11 - res_0) gives the plt index * 4.
7324 * res_0: b PLTresolve
7325 * res_1: b PLTresolve
7326 * .
7327 * # Some number of entries towards the end can be nops
7328 * res_n_m3: nop
7329 * res_n_m2: nop
7330 * res_n_m1:
7331 *
7332 * PLTresolve:
7333 * addis 11,11,(1f-res_0)@ha
7334 * mflr 0
7335 * bcl 20,31,1f
7336 * 1: addi 11,11,(1b-res_0)@l
7337 * mflr 12
7338 * mtlr 0
7339 * sub 11,11,12 # r11 = index * 4
7340 * addis 12,12,(got+4-1b)@ha
7341 * lwz 0,(got+4-1b)@l(12) # got[1] address of dl_runtime_resolve
7342 * lwz 12,(got+8-1b)@l(12) # got[2] contains the map address
7343 * mtctr 0
7344 * add 0,11,11
7345 * add 11,0,11 # r11 = index * 12 = reloc offset.
7346 * bctr
7347 */
7349 {
7350 ADDIS_11_11,
7351 MFLR_0,
7352 BCL_20_31,
7353 ADDI_11_11,
7354 MFLR_12,
7355 MTLR_0,
7356 SUB_11_11_12,
7357 ADDIS_12_12,
7358 LWZ_0_12,
7359 LWZ_12_12,
7360 MTCTR_0,
7361 ADD_0_11_11,
7362 ADD_11_0_11,
7363 BCTR,
7364 NOP,
7365 NOP
7366 };
7369 {
7370 LIS_12,
7371 ADDIS_11_11,
7372 LWZ_0_12,
7373 ADDI_11_11,
7374 MTCTR_0,
7375 ADD_0_11_11,
7376 LWZ_12_12,
7377 ADD_11_0_11,
7378 BCTR,
7379 NOP,
7380 NOP,
7381 NOP,
7382 NOP,
7383 NOP,
7384 NOP,
7385 NOP
7386 };
7393 /* Build the branch table, one for each plt entry (less one),
7394 and perhaps some padding. */
7400 {
7403 }
7405 {
7408 }
7414 /* Last comes the PLTresolve stub. */
7416 {
7417 bfd_vma bcl;
7420 {
7423 }
7437 {
7442 }
7443 else
7444 {
7449 }
7450 }
7451 else
7452 {
7454 {
7457 }
7467 {
7472 }
7473 else
7474 {
7479 }
7480 }
7481 }
7484 }
7485 \f
7486 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
7488 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
7490 #define ELF_ARCH bfd_arch_powerpc
7491 #define ELF_MACHINE_CODE EM_PPC
7492 #ifdef __QNXTARGET__
7493 #define ELF_MAXPAGESIZE 0x1000
7494 #else
7495 #define ELF_MAXPAGESIZE 0x10000
7496 #endif
7497 #define ELF_MINPAGESIZE 0x1000
7498 #define ELF_COMMONPAGESIZE 0x1000
7499 #define elf_info_to_howto ppc_elf_info_to_howto
7501 #ifdef EM_CYGNUS_POWERPC
7502 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
7503 #endif
7505 #ifdef EM_PPC_OLD
7506 #define ELF_MACHINE_ALT2 EM_PPC_OLD
7507 #endif
7509 #define elf_backend_plt_not_loaded 1
7510 #define elf_backend_can_gc_sections 1
7511 #define elf_backend_can_refcount 1
7512 #define elf_backend_rela_normal 1
7514 #define bfd_elf32_mkobject ppc_elf_mkobject
7515 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
7516 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
7517 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
7518 #define bfd_elf32_bfd_reloc_name_lookup ppc_elf_reloc_name_lookup
7519 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
7520 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create
7522 #define elf_backend_object_p ppc_elf_object_p
7523 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
7524 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
7525 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
7526 #define elf_backend_relocate_section ppc_elf_relocate_section
7527 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
7528 #define elf_backend_check_relocs ppc_elf_check_relocs
7529 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol
7530 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
7531 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
7532 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
7533 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
7534 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
7535 #define elf_backend_fake_sections ppc_elf_fake_sections
7536 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
7537 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
7538 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
7539 #define elf_backend_write_core_note ppc_elf_write_core_note
7540 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
7541 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing
7542 #define elf_backend_final_write_processing ppc_elf_final_write_processing
7543 #define elf_backend_write_section ppc_elf_write_section
7544 #define elf_backend_get_sec_type_attr ppc_elf_get_sec_type_attr
7545 #define elf_backend_plt_sym_val ppc_elf_plt_sym_val
7546 #define elf_backend_action_discarded ppc_elf_action_discarded
7547 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
7551 /* VxWorks Target */
7553 #undef TARGET_LITTLE_SYM
7554 #undef TARGET_LITTLE_NAME
7556 #undef TARGET_BIG_SYM
7557 #define TARGET_BIG_SYM bfd_elf32_powerpc_vxworks_vec
7558 #undef TARGET_BIG_NAME
7561 /* VxWorks uses the elf default section flags for .plt. */
7564 {
7572 }
7574 /* Like ppc_elf_link_hash_table_create, but overrides
7575 appropriately for VxWorks. */
7578 {
7583 {
7591 }
7593 }
7595 /* Tweak magic VxWorks symbols as they are loaded. */
7596 static bfd_boolean
7604 {
7606 valp))
7610 }
7612 static void
7614 {
7617 }
7619 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
7620 define it. */
7621 #undef elf_backend_want_plt_sym
7622 #define elf_backend_want_plt_sym 1
7623 #undef elf_backend_want_got_plt
7624 #define elf_backend_want_got_plt 1
7625 #undef elf_backend_got_symbol_offset
7626 #define elf_backend_got_symbol_offset 0
7627 #undef elf_backend_plt_not_loaded
7628 #define elf_backend_plt_not_loaded 0
7629 #undef elf_backend_plt_readonly
7630 #define elf_backend_plt_readonly 1
7631 #undef elf_backend_got_header_size
7632 #define elf_backend_got_header_size 12
7634 #undef bfd_elf32_bfd_link_hash_table_create
7635 #define bfd_elf32_bfd_link_hash_table_create \
7636 ppc_elf_vxworks_link_hash_table_create
7637 #undef elf_backend_add_symbol_hook
7638 #define elf_backend_add_symbol_hook \
7639 ppc_elf_vxworks_add_symbol_hook
7640 #undef elf_backend_link_output_symbol_hook
7641 #define elf_backend_link_output_symbol_hook \
7642 elf_vxworks_link_output_symbol_hook
7643 #undef elf_backend_final_write_processing
7644 #define elf_backend_final_write_processing \
7645 ppc_elf_vxworks_final_write_processing
7646 #undef elf_backend_get_sec_type_attr
7647 #define elf_backend_get_sec_type_attr \
7648 ppc_elf_vxworks_get_sec_type_attr
7649 #undef elf_backend_emit_relocs
7650 #define elf_backend_emit_relocs \
7651 elf_vxworks_emit_relocs
7653 #undef elf32_bed
7654 #define elf32_bed ppc_elf_vxworks_bed