| blob | bc449b3f3ec76f5e84a8283d7fe52866ba897349 |
1 /* PowerPC-specific support for 32-bit ELF
2 Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
3 2004, 2005, 2006 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. */
37 /* RELA relocations are used here. */
39 static bfd_reloc_status_type ppc_elf_addr16_ha_reloc
41 static bfd_reloc_status_type ppc_elf_unhandled_reloc
44 /* Branch prediction bit for branch taken relocs. */
45 #define BRANCH_PREDICT_BIT 0x200000
46 /* Mask to set RA in memory instructions. */
47 #define RA_REGISTER_MASK 0x001f0000
48 /* Value to shift register by to insert RA. */
49 #define RA_REGISTER_SHIFT 16
51 /* The name of the dynamic interpreter. This is put in the .interp
52 section. */
55 /* For old-style PLT. */
56 /* The number of single-slot PLT entries (the rest use two slots). */
57 #define PLT_NUM_SINGLE_ENTRIES 8192
59 /* For new-style .glink and .plt. */
60 #define GLINK_PLTRESOLVE 16*4
61 #define GLINK_ENTRY_SIZE 4*4
63 /* VxWorks uses its own plt layout, filled in by the static linker. */
65 /* The standard VxWorks PLT entry. */
66 #define VXWORKS_PLT_ENTRY_SIZE 32
67 static const bfd_vma ppc_elf_vxworks_plt_entry
69 {
78 };
79 static const bfd_vma ppc_elf_vxworks_pic_plt_entry
81 {
90 };
92 /* The initial VxWorks PLT entry. */
93 #define VXWORKS_PLT_INITIAL_ENTRY_SIZE 32
94 static const bfd_vma ppc_elf_vxworks_plt0_entry
96 {
105 };
106 static const bfd_vma ppc_elf_vxworks_pic_plt0_entry
108 {
117 };
119 /* For executables, we have some additional relocations in
120 .rela.plt.unloaded, for the kernel loader. */
122 /* The number of non-JMP_SLOT relocations per PLT0 slot. */
123 #define VXWORKS_PLT_NON_JMP_SLOT_RELOCS 3
124 /* The number of relocations in the PLTResolve slot. */
125 #define VXWORKS_PLTRESOLVE_RELOCS 2
126 /* The number of relocations in the PLTResolve slot when when creating
127 a shared library. */
128 #define VXWORKS_PLTRESOLVE_RELOCS_SHLIB 0
130 /* Some instructions. */
131 #define ADDIS_11_11 0x3d6b0000
132 #define ADDIS_11_30 0x3d7e0000
133 #define ADDIS_12_12 0x3d8c0000
134 #define ADDI_11_11 0x396b0000
135 #define ADD_0_11_11 0x7c0b5a14
136 #define ADD_11_0_11 0x7d605a14
137 #define B 0x48000000
138 #define BCL_20_31 0x429f0005
139 #define BCTR 0x4e800420
140 #define LIS_11 0x3d600000
141 #define LIS_12 0x3d800000
142 #define LWZU_0_12 0x840c0000
143 #define LWZ_0_12 0x800c0000
144 #define LWZ_11_11 0x816b0000
145 #define LWZ_11_30 0x817e0000
146 #define LWZ_12_12 0x818c0000
147 #define MFLR_0 0x7c0802a6
148 #define MFLR_12 0x7d8802a6
149 #define MTCTR_0 0x7c0903a6
150 #define MTCTR_11 0x7d6903a6
151 #define MTLR_0 0x7c0803a6
152 #define NOP 0x60000000
153 #define SUB_11_11_12 0x7d6c5850
155 /* Offset of tp and dtp pointers from start of TLS block. */
156 #define TP_OFFSET 0x7000
157 #define DTP_OFFSET 0x8000
158 \f
162 /* This reloc does nothing. */
177 /* A standard 32 bit relocation. */
192 /* An absolute 26 bit branch; the lower two bits must be zero.
193 FIXME: we don't check that, we just clear them. */
208 /* A standard 16 bit relocation. */
223 /* A 16 bit relocation without overflow. */
238 /* The high order 16 bits of an address. */
253 /* The high order 16 bits of an address, plus 1 if the contents of
254 the low 16 bits, treated as a signed number, is negative. */
269 /* An absolute 16 bit branch; the lower two bits must be zero.
270 FIXME: we don't check that, we just clear them. */
285 /* An absolute 16 bit branch, for which bit 10 should be set to
286 indicate that the branch is expected to be taken. The lower two
287 bits must be zero. */
302 /* An absolute 16 bit branch, for which bit 10 should be set to
303 indicate that the branch is not expected to be taken. The lower
304 two bits must be zero. */
319 /* A relative 26 bit branch; the lower two bits must be zero. */
334 /* A relative 16 bit branch; the lower two bits must be zero. */
349 /* A relative 16 bit branch. Bit 10 should be set to indicate that
350 the branch is expected to be taken. The lower two bits must be
351 zero. */
366 /* A relative 16 bit branch. Bit 10 should be set to indicate that
367 the branch is not expected to be taken. The lower two bits must
368 be zero. */
383 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the
384 symbol. */
399 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
400 the symbol. */
415 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
416 the symbol. */
431 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
432 the symbol. */
447 /* Like R_PPC_REL24, but referring to the procedure linkage table
448 entry for the symbol. */
463 /* This is used only by the dynamic linker. The symbol should exist
464 both in the object being run and in some shared library. The
465 dynamic linker copies the data addressed by the symbol from the
466 shared library into the object, because the object being
467 run has to have the data at some particular address. */
482 /* Like R_PPC_ADDR32, but used when setting global offset table
483 entries. */
498 /* Marks a procedure linkage table entry for a symbol. */
513 /* Used only by the dynamic linker. When the object is run, this
514 longword is set to the load address of the object, plus the
515 addend. */
530 /* Like R_PPC_REL24, but uses the value of the symbol within the
531 object rather than the final value. Normally used for
532 _GLOBAL_OFFSET_TABLE_. */
547 /* Like R_PPC_ADDR32, but may be unaligned. */
562 /* Like R_PPC_ADDR16, but may be unaligned. */
577 /* 32-bit PC relative */
592 /* 32-bit relocation to the symbol's procedure linkage table.
593 FIXME: not supported. */
608 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
609 FIXME: not supported. */
624 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
625 the symbol. */
640 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
641 the symbol. */
656 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
657 the symbol. */
672 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
673 small data items. */
688 /* 16-bit section relative relocation. */
703 /* 16-bit lower half section relative relocation. */
718 /* 16-bit upper half section relative relocation. */
733 /* 16-bit upper half adjusted section relative relocation. */
748 /* Marker reloc for TLS. */
763 /* Computes the load module index of the load module that contains the
764 definition of its TLS sym. */
779 /* Computes a dtv-relative displacement, the difference between the value
780 of sym+add and the base address of the thread-local storage block that
781 contains the definition of sym, minus 0x8000. */
796 /* A 16 bit dtprel reloc. */
811 /* Like DTPREL16, but no overflow. */
826 /* Like DTPREL16_LO, but next higher group of 16 bits. */
841 /* Like DTPREL16_HI, but adjust for low 16 bits. */
856 /* Computes a tp-relative displacement, the difference between the value of
857 sym+add and the value of the thread pointer (r13). */
872 /* A 16 bit tprel reloc. */
887 /* Like TPREL16, but no overflow. */
902 /* Like TPREL16_LO, but next higher group of 16 bits. */
917 /* Like TPREL16_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 (sym+add)@dtprel, and computes the offset
934 to the first entry. */
949 /* Like GOT_TLSGD16, but no overflow. */
964 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */
979 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */
994 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
995 with values (sym+add)@dtpmod and zero, and computes the offset to the
996 first entry. */
1011 /* Like GOT_TLSLD16, but no overflow. */
1026 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */
1041 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */
1056 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes
1057 the offset to the entry. */
1072 /* Like GOT_DTPREL16, but no overflow. */
1087 /* Like GOT_DTPREL16_LO, but next higher group of 16 bits. */
1102 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */
1117 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the
1118 offset to the entry. */
1133 /* Like GOT_TPREL16, but no overflow. */
1148 /* Like GOT_TPREL16_LO, but next higher group of 16 bits. */
1163 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */
1178 /* The remaining relocs are from the Embedded ELF ABI, and are not
1179 in the SVR4 ELF ABI. */
1181 /* 32 bit value resulting from the addend minus the symbol. */
1196 /* 16 bit value resulting from the addend minus the symbol. */
1211 /* 16 bit value resulting from the addend minus the symbol. */
1226 /* The high order 16 bits of the addend minus the symbol. */
1241 /* The high order 16 bits of the result of the addend minus the address,
1242 plus 1 if the contents of the low 16 bits, treated as a signed number,
1243 is negative. */
1258 /* 16 bit value resulting from allocating a 4 byte word to hold an
1259 address in the .sdata section, and returning the offset from
1260 _SDA_BASE_ for that relocation. */
1275 /* 16 bit value resulting from allocating a 4 byte word to hold an
1276 address in the .sdata2 section, and returning the offset from
1277 _SDA2_BASE_ for that relocation. */
1292 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
1293 small data items. */
1308 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
1309 signed offset from the appropriate base, and filling in the register
1310 field with the appropriate register (0, 2, or 13). */
1325 /* Relocation not handled: R_PPC_EMB_MRKREF */
1326 /* Relocation not handled: R_PPC_EMB_RELSEC16 */
1327 /* Relocation not handled: R_PPC_EMB_RELST_LO */
1328 /* Relocation not handled: R_PPC_EMB_RELST_HI */
1329 /* Relocation not handled: R_PPC_EMB_RELST_HA */
1330 /* Relocation not handled: R_PPC_EMB_BIT_FLD */
1332 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
1333 in the 16 bit signed offset from the appropriate base, and filling in the
1334 register field with the appropriate register (0, 2, or 13). */
1349 /* A 16 bit relative relocation. */
1364 /* A 16 bit relative relocation without overflow. */
1379 /* The high order 16 bits of a relative address. */
1394 /* The high order 16 bits of a relative address, plus 1 if the contents of
1395 the low 16 bits, treated as a signed number, is negative. */
1410 /* GNU extension to record C++ vtable hierarchy. */
1425 /* GNU extension to record C++ vtable member usage. */
1440 /* Phony reloc to handle AIX style TOC entries. */
1454 };
1455 \f
1456 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
1458 static void
1460 {
1465 i++)
1466 {
1472 }
1473 }
1477 bfd_reloc_code_real_type code)
1478 {
1481 /* Initialize howto table if not already done. */
1486 {
1575 }
1578 };
1580 /* Set the howto pointer for a PowerPC ELF reloc. */
1582 static void
1586 {
1587 /* Initialize howto table if not already done. */
1593 }
1595 /* Handle the R_PPC_ADDR16_HA and R_PPC_REL16_HA relocs. */
1597 static bfd_reloc_status_type
1605 {
1606 bfd_vma relocation;
1609 {
1612 }
1619 else
1631 }
1633 static bfd_reloc_status_type
1641 {
1642 /* If this is a relocatable link (output_bfd test tells us), just
1643 call the generic function. Any adjustment will be done at final
1644 link time. */
1650 {
1655 }
1657 }
1658 \f
1659 /* Sections created by the linker. */
1662 {
1663 /* Pointer to the bfd section. */
1665 /* Section name. */
1667 /* Associated bss section name. */
1669 /* Associated symbol name. */
1671 /* Associated symbol. */
1675 /* Linked list of allocated pointer entries. This hangs off of the
1676 symbol lists, and provides allows us to return different pointers,
1677 based on different addend's. */
1680 {
1681 /* next allocated pointer for this symbol */
1683 /* offset of pointer from beginning of section */
1684 bfd_vma offset;
1685 /* addend used */
1686 bfd_vma addend;
1687 /* which linker section this is */
1691 struct ppc_elf_obj_tdata
1692 {
1695 /* A mapping from local symbols to offsets into the various linker
1696 sections added. This is index by the symbol index. */
1698 };
1700 #define ppc_elf_tdata(bfd) \
1701 ((struct ppc_elf_obj_tdata *) (bfd)->tdata.any)
1703 #define elf_local_ptr_offsets(bfd) \
1704 (ppc_elf_tdata (bfd)->linker_section_pointers)
1706 /* Override the generic function because we store some extras. */
1708 static bfd_boolean
1710 {
1712 {
1717 }
1719 }
1721 /* Fix bad default arch selected for a 32 bit input bfd when the
1722 default is 64 bit. */
1724 static bfd_boolean
1726 {
1728 {
1732 {
1733 /* Relies on arch after 64 bit default being 32 bit default. */
1736 }
1737 }
1739 }
1741 /* Function to set whether a module needs the -mrelocatable bit set. */
1743 static bfd_boolean
1745 {
1752 }
1754 /* Support for core dump NOTE sections. */
1756 static bfd_boolean
1758 {
1763 {
1768 /* pr_cursig */
1771 /* pr_pid */
1774 /* pr_reg */
1779 }
1781 /* Make a ".reg/999" section. */
1784 }
1786 static bfd_boolean
1788 {
1790 {
1799 }
1801 /* Note that for some reason, a spurious space is tacked
1802 onto the end of the args in some (at least one anyway)
1803 implementations, so strip it off if it exists. */
1805 {
1811 }
1814 }
1816 /* Return address for Ith PLT stub in section PLT, for relocation REL
1817 or (bfd_vma) -1 if it should not be included. */
1819 static bfd_vma
1823 {
1825 }
1827 /* Handle a PowerPC specific section when reading an object file. This
1828 is called when bfd_section_from_shdr finds a section with an unknown
1829 type. */
1831 static bfd_boolean
1836 {
1838 flagword flags;
1853 }
1855 /* Set up any other section flags and such that may be necessary. */
1857 static bfd_boolean
1861 {
1869 }
1871 /* If we have .sbss2 or .PPC.EMB.sbss0 output sections, we
1872 need to bump up the number of section headers. */
1874 static int
1877 {
1890 }
1892 /* Add extra PPC sections -- Note, for now, make .sbss2 and
1893 .PPC.EMB.sbss0 a normal section, and not a bss section so
1894 that the linker doesn't crater when trying to make more than
1895 2 sections. */
1898 {
1909 };
1911 /* This is what we want for new plt/got. */
1917 {
1920 /* See if this is one of the special sections. */
1927 {
1931 }
1934 }
1935 \f
1936 /* Very simple linked list structure for recording apuinfo values. */
1938 {
1941 }
1942 apuinfo_list;
1947 static void
1949 {
1951 }
1953 static void
1955 {
1959 {
1963 }
1972 }
1974 static unsigned
1976 {
1981 entry;
1986 }
1990 {
1996 ;
1999 }
2001 static void
2003 {
2007 {
2011 }
2014 }
2019 /* Scan the input BFDs and create a linked list of
2020 the APUinfo values that will need to be emitted. */
2022 static void
2024 {
2029 bfd_size_type output_section_size;
2039 /* Scan the input bfds, looking for apuinfo sections. */
2044 {
2047 {
2050 }
2051 }
2053 /* We need at least one input sections
2054 in order to make merging worthwhile. */
2058 /* Just make sure that the output section exists as well. */
2063 /* Allocate a buffer for the contents of the input sections. */
2071 /* Read in the input sections contents. */
2073 {
2083 {
2086 }
2090 {
2093 }
2095 /* Process the contents of the section. */
2099 /* Verify the contents of the header. Note - we have to
2100 extract the values this way in order to allow for a
2101 host whose endian-ness is different from the target. */
2113 /* Get the number of bytes used for apuinfo entries. */
2118 /* Make sure that we do not run off the end of the section. */
2122 /* Scan the apuinfo section, building a list of apuinfo numbers. */
2126 /* Update the offset. */
2128 }
2132 /* Compute the size of the output section. */
2142 fail:
2147 }
2149 /* Prevent the output section from accumulating the input sections'
2150 contents. We have already stored this in our linked list structure. */
2152 static bfd_boolean
2156 {
2159 }
2161 /* Finally we can generate the output section. */
2163 static void
2165 {
2170 bfd_size_type length;
2185 {
2189 }
2191 /* Create the apuinfo header. */
2200 {
2203 }
2214 }
2215 \f
2216 /* The following functions are specific to the ELF linker, while
2217 functions above are used generally. They appear in this file more
2218 or less in the order in which they are called. eg.
2219 ppc_elf_check_relocs is called early in the link process,
2220 ppc_elf_finish_dynamic_sections is one of the last functions
2221 called. */
2223 /* The PPC linker needs to keep track of the number of relocs that it
2224 decides to copy as dynamic relocs in check_relocs for each symbol.
2225 This is so that it can later discard them if they are found to be
2226 unnecessary. We store the information in a field extending the
2227 regular ELF linker hash table. */
2229 struct ppc_elf_dyn_relocs
2230 {
2233 /* The input section of the reloc. */
2236 /* Total number of relocs copied for the input section. */
2237 bfd_size_type count;
2239 /* Number of pc-relative relocs copied for the input section. */
2240 bfd_size_type pc_count;
2241 };
2243 /* Track PLT entries needed for a given symbol. We might need more
2244 than one glink entry per symbol. */
2245 struct plt_entry
2246 {
2249 /* -fPIC uses multiple GOT sections, one per file, called ".got2".
2250 This field stores the offset into .got2 used to initialise the
2251 GOT pointer reg. It will always be at least 32768 (and for
2252 current gcc this is the only offset used). */
2253 bfd_vma addend;
2255 /* The .got2 section. */
2258 /* PLT refcount or offset. */
2259 union
2260 {
2261 bfd_signed_vma refcount;
2262 bfd_vma offset;
2265 /* .glink stub offset. */
2266 bfd_vma glink_offset;
2267 };
2269 /* Of those relocs that might be copied as dynamic relocs, this macro
2270 selects those that must be copied when linking a shared library,
2271 even when the symbol is local. */
2273 #define MUST_BE_DYN_RELOC(RTYPE) \
2274 ((RTYPE) != R_PPC_REL24 \
2275 && (RTYPE) != R_PPC_REL14 \
2276 && (RTYPE) != R_PPC_REL14_BRTAKEN \
2277 && (RTYPE) != R_PPC_REL14_BRNTAKEN \
2278 && (RTYPE) != R_PPC_REL32)
2280 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
2281 copying dynamic variables from a shared lib into an app's dynbss
2282 section, and instead use a dynamic relocation to point into the
2283 shared lib. */
2284 #define ELIMINATE_COPY_RELOCS 1
2286 /* PPC ELF linker hash entry. */
2288 struct ppc_elf_link_hash_entry
2289 {
2292 /* If this symbol is used in the linker created sections, the processor
2293 specific backend uses this field to map the field into the offset
2294 from the beginning of the section. */
2297 /* Track dynamic relocs copied for this symbol. */
2300 /* Contexts in which symbol is used in the GOT (or TOC).
2301 TLS_GD .. TLS_TLS bits are or'd into the mask as the
2302 corresponding relocs are encountered during check_relocs.
2303 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
2304 indicate the corresponding GOT entry type is not needed. */
2313 /* Nonzero if we have seen a small data relocation referring to this
2314 symbol. */
2316 };
2318 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent))
2321 PLT_UNSET,
2322 PLT_OLD,
2323 PLT_NEW,
2324 PLT_VXWORKS
2325 };
2327 /* PPC ELF linker hash table. */
2329 struct ppc_elf_link_hash_table
2330 {
2333 /* Short-cuts to get to dynamic linker sections. */
2346 /* Shortcut to .__tls_get_addr. */
2349 /* TLS local dynamic got entry handling. */
2351 bfd_signed_vma refcount;
2352 bfd_vma offset;
2355 /* Offset of PltResolve function in glink. */
2356 bfd_vma glink_pltresolve;
2358 /* Size of reserved GOT entries. */
2360 /* Non-zero if allocating the header left a gap. */
2363 /* The type of PLT we have chosen to use. */
2366 /* Whether we can use the new PLT layout. */
2369 /* Set if we should emit symbols for stubs. */
2372 /* Small local sym to section mapping cache. */
2375 /* The (unloaded but important) .rela.plt.unloaded on VxWorks. */
2378 /* The .got.plt section (VxWorks only)*/
2381 /* True if the target system is VxWorks. */
2384 /* The size of PLT entries. */
2386 /* The distance between adjacent PLT slots. */
2388 /* The size of the first PLT entry. */
2390 };
2392 /* Get the PPC ELF linker hash table from a link_info structure. */
2394 #define ppc_elf_hash_table(p) \
2395 ((struct ppc_elf_link_hash_table *) (p)->hash)
2397 /* Create an entry in a PPC ELF linker hash table. */
2403 {
2404 /* Allocate the structure if it has not already been allocated by a
2405 subclass. */
2407 {
2412 }
2414 /* Call the allocation method of the superclass. */
2417 {
2421 }
2424 }
2426 /* Create a PPC ELF linker hash table. */
2430 {
2438 ppc_elf_link_hash_newfunc,
2440 {
2443 }
2465 }
2467 /* Create .got and the related sections. */
2469 static bfd_boolean
2471 {
2474 flagword flags;
2485 {
2489 }
2490 else
2491 {
2492 /* The powerpc .got has a blrl instruction in it. Mark it
2493 executable. */
2498 }
2508 }
2510 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2511 to output sections (just like _bfd_elf_create_dynamic_sections has
2512 to create .dynbss and .rela.bss). */
2514 static bfd_boolean
2516 {
2519 flagword flags;
2547 {
2554 }
2567 /* The VxWorks PLT is a loaded section with contents. */
2570 }
2572 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2574 static void
2578 {
2585 {
2587 {
2591 /* Add reloc counts against the indirect sym to the direct sym
2592 list. Merge any entries against the same section. */
2594 {
2599 {
2604 }
2607 }
2609 }
2613 }
2618 /* If called to transfer flags for a weakdef during processing
2619 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
2620 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
2631 /* If we were called to copy over info for a weak sym, that's all. */
2635 /* Copy over the GOT refcount entries that we may have already seen to
2636 the symbol which just became indirect. */
2640 /* And plt entries. */
2642 {
2644 {
2649 {
2654 {
2658 }
2661 }
2663 }
2667 }
2670 {
2678 }
2679 }
2681 /* Return 1 if target is one of ours. */
2683 static bfd_boolean
2685 {
2693 }
2695 /* Hook called by the linker routine which adds symbols from an object
2696 file. We use it to put .comm items in .sbss, and not .bss. */
2698 static bfd_boolean
2706 {
2711 {
2712 /* Common symbols less than or equal to -G nn bytes are automatically
2713 put into .sbss. */
2718 {
2726 flags);
2729 }
2733 }
2736 }
2737 \f
2738 static bfd_boolean
2741 {
2750 }
2752 /* Create a special linker section. */
2754 static bfd_boolean
2757 flagword flags,
2759 {
2766 /* Record the first bfd that needs the special sections. */
2772 flags);
2779 }
2781 /* Find a linker generated pointer with a given addend and type. */
2784 elf_find_pointer_linker_section
2786 bfd_vma addend,
2788 {
2794 }
2796 /* Allocate a pointer to live in a linker created section. */
2798 static bfd_boolean
2803 {
2807 bfd_size_type amt;
2811 /* Is this a global symbol? */
2813 {
2816 /* Has this symbol already been allocated? If so, our work is done. */
2820 lsect))
2824 }
2825 else
2826 {
2827 /* Allocation of a pointer to a local symbol. */
2830 /* Allocate a table to hold the local symbols if first time. */
2832 {
2843 }
2845 /* Has this symbol already been allocated? If so, our work is done. */
2848 lsect))
2852 }
2854 /* Allocate space for a pointer in the linker section, and allocate
2855 a new pointer record from internal memory. */
2871 #ifdef DEBUG
2876 #endif
2879 }
2881 static bfd_boolean
2886 {
2891 {
2899 }
2905 }
2907 static bfd_boolean
2910 {
2919 {
2929 }
2932 }
2936 {
2945 }
2947 static void
2949 {
2952 abfd,
2955 }
2957 /* Look through the relocs for a section during the first phase, and
2958 allocate space in the global offset table or procedure linkage
2959 table. */
2961 static bfd_boolean
2966 {
2977 /* Don't do anything special with non-loaded, non-alloced sections.
2978 In particular, any relocs in such sections should not affect GOT
2979 and PLT reference counting (ie. we don't allow them to create GOT
2980 or PLT entries), there's no possibility or desire to optimize TLS
2981 relocs, and there's not much point in propagating relocs to shared
2982 libs that the dynamic linker won't relocate. */
2986 #ifdef DEBUG
2989 #endif
2991 /* Initialize howto table if not already done. */
3003 {
3012 else
3013 {
3018 }
3020 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
3021 This shows up in particular in an R_PPC_ADDR32 in the eabi
3022 startup code. */
3026 {
3032 }
3036 {
3066 dogottls:
3068 /* Fall thru */
3070 /* GOT16 relocations */
3075 /* This symbol requires a global offset table entry. */
3077 {
3082 }
3084 {
3087 }
3088 else
3089 /* This is a global offset table entry for a local symbol. */
3094 /* Indirect .sdata relocation. */
3097 {
3100 }
3109 {
3112 }
3115 /* Indirect .sdata2 relocation. */
3118 {
3121 }
3130 {
3133 }
3138 {
3141 }
3146 {
3149 }
3154 {
3157 }
3162 {
3165 }
3171 {
3174 }
3182 {
3185 }
3194 {
3197 }
3208 #ifdef DEBUG
3210 #endif
3211 /* This symbol requires a procedure linkage table entry. We
3212 actually build the entry in finish_dynamic_symbol,
3213 because this might be a case of linking PIC code without
3214 linking in any dynamic objects, in which case we don't
3215 need to generate a procedure linkage table after all. */
3218 {
3219 /* It does not make sense to have a procedure linkage
3220 table entry for a local symbol. */
3223 abfd,
3224 sec,
3229 }
3230 else
3231 {
3237 }
3240 /* The following relocations don't need to propagate the
3241 relocation if linking a shared object since they are
3242 section relative. */
3261 /* These are just markers. */
3268 /* These should only appear in dynamic objects. */
3275 /* These aren't handled yet. We'll report an error later. */
3284 /* This refers only to functions defined in the shared library. */
3290 /* This relocation describes the C++ object vtable hierarchy.
3291 Reconstruct it for later use during GC. */
3297 /* This relocation describes which C++ vtable entries are actually
3298 used. Record for later use during GC. */
3304 /* We shouldn't really be seeing these. */
3310 /* Nor these. */
3329 {
3330 /* Old -fPIC gcc code has .long LCTOC1-LCFx just before
3331 the start of a function, which assembles to a REL32
3332 reference to .got2. If we detect one of these, then
3333 force the old PLT layout because the linker cannot
3334 reliably deduce the GOT pointer value needed for
3335 PLT call stubs. */
3339 r_symndx);
3342 }
3354 {
3358 }
3359 /* fall through */
3372 dodyn1:
3374 {
3375 /* We may need a plt entry if the symbol turns out to be
3376 a function defined in a dynamic object. */
3380 /* We may need a copy reloc too. */
3382 }
3384 dodyn:
3385 /* If we are creating a shared library, and this is a reloc
3386 against a global symbol, or a non PC relative reloc
3387 against a local symbol, then we need to copy the reloc
3388 into the shared library. However, if we are linking with
3389 -Bsymbolic, we do not need to copy a reloc against a
3390 global symbol which is defined in an object we are
3391 including in the link (i.e., DEF_REGULAR is set). At
3392 this point we have not seen all the input files, so it is
3393 possible that DEF_REGULAR is not set now but will be set
3394 later (it is never cleared). In case of a weak definition,
3395 DEF_REGULAR may be cleared later by a strong definition in
3396 a shared library. We account for that possibility below by
3397 storing information in the dyn_relocs field of the hash
3398 table entry. A similar situation occurs when creating
3399 shared libraries and symbol visibility changes render the
3400 symbol local.
3402 If on the other hand, we are creating an executable, we
3403 may need to keep relocations for symbols satisfied by a
3404 dynamic library if we manage to avoid copy relocs for the
3405 symbol. */
3412 || (ELIMINATE_COPY_RELOCS
3417 {
3421 #ifdef DEBUG
3423 "ppc_elf_check_relocs needs to "
3427 #endif
3429 {
3432 name = (bfd_elf_string_from_elf_section
3447 {
3448 flagword flags;
3454 name,
3455 flags);
3460 }
3462 }
3464 /* If this is a global symbol, we count the number of
3465 relocations we need for this symbol. */
3467 {
3469 }
3470 else
3471 {
3472 /* Track dynamic relocs needed for local syms too.
3473 We really need local syms available to do this
3474 easily. Oh well. */
3486 }
3490 {
3499 }
3504 }
3507 }
3508 }
3511 }
3512 \f
3513 /* Merge backend specific data from an object file to the output
3514 object file when linking. */
3516 static bfd_boolean
3518 {
3519 flagword old_flags;
3520 flagword new_flags;
3521 bfd_boolean error;
3527 /* Check if we have the same endianess. */
3534 {
3535 /* First call, no flags set. */
3538 }
3540 /* Compatible flags are ok. */
3542 ;
3544 /* Incompatible flags. */
3545 else
3546 {
3547 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
3548 to be linked with either. */
3552 {
3557 }
3560 {
3565 }
3567 /* The output is -mrelocatable-lib iff both the input files are. */
3571 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
3572 but each input file is either -mrelocatable or -mrelocatable-lib. */
3578 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
3579 any module uses it. */
3585 /* Warn about any other mismatches. */
3587 {
3593 }
3596 {
3599 }
3600 }
3603 }
3604 \f
3605 /* Choose which PLT scheme to use, and set .plt flags appropriately.
3606 Returns -1 on error, 0 for old PLT, 1 for new PLT. */
3607 int
3612 {
3614 flagword flags;
3627 {
3631 /* The new PLT is a loaded section. */
3636 /* The new GOT is not executable. */
3640 }
3641 else
3642 {
3643 /* Stop an unused .glink section from affecting .text alignment. */
3647 }
3649 }
3650 \f
3651 /* Return the section that should be marked against GC for a given
3652 relocation. */
3660 {
3662 {
3664 {
3671 {
3681 }
3682 }
3683 }
3684 else
3688 }
3690 /* Update the got, plt and dynamic reloc reference counts for the
3691 section being removed. */
3693 static bfd_boolean
3698 {
3719 {
3726 {
3738 {
3739 /* Everything must go for SEC. */
3742 }
3743 }
3747 {
3753 /* Fall thru */
3772 {
3775 }
3777 {
3780 }
3790 /* Fall thru */
3813 {
3818 }
3823 }
3824 }
3826 }
3827 \f
3828 /* Set htab->tls_get_addr and call the generic ELF tls_setup function. */
3830 asection *
3832 {
3839 {
3842 }
3847 }
3849 /* Run through all the TLS relocs looking for optimization
3850 opportunities. */
3852 bfd_boolean
3855 {
3865 {
3871 {
3875 /* Read the relocations. */
3884 {
3890 bfd_boolean is_local;
3894 {
3902 }
3911 {
3916 /* These relocs should never be against a symbol
3917 defined in a shared lib. Leave them alone if
3918 that turns out to be the case. */
3924 /* LD -> LE */
3935 /* GD -> LE */
3937 else
3938 /* GD -> IE */
3950 {
3951 /* IE -> LE */
3955 }
3956 else
3966 {
3970 }
3977 }
3980 {
3982 {
3983 /* We managed to get rid of a got entry. */
3986 }
3988 }
3989 else
3990 {
3996 {
4003 {
4007 }
4008 }
4014 {
4015 /* We managed to get rid of a got entry. */
4018 }
4021 }
4025 }
4029 }
4033 {
4036 else
4038 }
4039 }
4041 }
4042 \f
4043 /* Adjust a symbol defined by a dynamic object and referenced by a
4044 regular object. The current definition is in some section of the
4045 dynamic object, but we're not including those sections. We have to
4046 change the definition to something the rest of the link can
4047 understand. */
4049 static bfd_boolean
4052 {
4057 #ifdef DEBUG
4060 #endif
4062 /* Make sure we know what is going on here. */
4071 /* Deal with function syms. */
4074 {
4075 /* Clear procedure linkage table information for any symbol that
4076 won't need a .plt entry. */
4085 {
4086 /* A PLT entry is not required/allowed when:
4088 1. We are not using ld.so; because then the PLT entry
4089 can't be set up, so we can't use one. In this case,
4090 ppc_elf_adjust_dynamic_symbol won't even be called.
4092 2. GC has rendered the entry unused.
4094 3. We know for certain that a call to this symbol
4095 will go to this object, or will remain undefined. */
4098 }
4100 }
4101 else
4104 /* If this is a weak symbol, and there is a real definition, the
4105 processor independent code will have arranged for us to see the
4106 real definition first, and we can just use the same value. */
4108 {
4116 }
4118 /* This is a reference to a symbol defined by a dynamic object which
4119 is not a function. */
4121 /* If we are creating a shared library, we must presume that the
4122 only references to the symbol are via the global offset table.
4123 For such cases we need not do anything here; the relocations will
4124 be handled correctly by relocate_section. */
4128 /* If there are no references to this symbol that do not use the
4129 GOT, we don't need to generate a copy reloc. */
4133 /* If we didn't find any dynamic relocs in read-only sections, then we'll
4134 be keeping the dynamic relocs and avoiding the copy reloc. We can't
4135 do this if there are any small data relocations. */
4138 {
4141 {
4145 }
4148 {
4151 }
4152 }
4155 {
4159 }
4161 /* We must allocate the symbol in our .dynbss section, which will
4162 become part of the .bss section of the executable. There will be
4163 an entry for this symbol in the .dynsym section. The dynamic
4164 object will contain position independent code, so all references
4165 from the dynamic object to this symbol will go through the global
4166 offset table. The dynamic linker will use the .dynsym entry to
4167 determine the address it must put in the global offset table, so
4168 both the dynamic object and the regular object will refer to the
4169 same memory location for the variable.
4171 Of course, if the symbol is referenced using SDAREL relocs, we
4172 must instead allocate it in .sbss. */
4176 else
4180 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
4181 copy the initial value out of the dynamic object and into the
4182 runtime process image. We need to remember the offset into the
4183 .rela.bss section we are going to use. */
4185 {
4190 else
4195 }
4197 /* We need to figure out the alignment required for this symbol. I
4198 have no idea how ELF linkers handle this. */
4203 /* Apply the required alignment. */
4206 {
4209 }
4211 /* Define the symbol as being at this point in the section. */
4215 /* Increment the section size to make room for the symbol. */
4219 }
4220 \f
4221 /* Generate a symbol to mark plt call stubs. For non-PIC code the sym is
4222 xxxxxxxx.plt_call32.<callee> where xxxxxxxx is a hex number, usually 0,
4223 specifying the addend on the plt relocation. For -fpic code, the sym
4224 is xxxxxxxx.plt_pic32.<callee>, and for -fPIC
4225 xxxxxxxx.got2.plt_pic32.<callee>. */
4227 static bfd_boolean
4231 {
4240 else
4260 {
4269 }
4271 }
4273 /* Allocate NEED contiguous space in .got, and return the offset.
4274 Handles allocation of the got header when crossing 32k. */
4276 static bfd_vma
4278 {
4279 bfd_vma where;
4283 {
4286 }
4287 else
4288 {
4291 {
4294 }
4295 else
4296 {
4299 {
4302 }
4305 }
4306 }
4308 }
4310 /* Allocate space in associated reloc sections for dynamic relocs. */
4312 static bfd_boolean
4314 {
4324 /* When warning symbols are created, they **replace** the "real"
4325 entry in the hash table, thus we never get to see the real
4326 symbol in a hash traversal. So look at it now. */
4331 {
4338 {
4339 /* Make sure this symbol is output as a dynamic symbol. */
4342 {
4345 }
4349 {
4353 {
4355 {
4358 }
4363 {
4366 }
4370 {
4373 }
4379 }
4380 else
4381 {
4383 {
4384 /* If this is the first .plt entry, make room
4385 for the special first entry. */
4389 /* The PowerPC PLT is actually composed of two
4390 parts, the first part is 2 words (for a load
4391 and a jump), and then there is a remaining
4392 word available at the end. */
4399 /* If this symbol is not defined in a regular
4400 file, and we are not generating a shared
4401 library, then set the symbol to this location
4402 in the .plt. This is required to make
4403 function pointers compare as equal between
4404 the normal executable and the shared library. */
4407 {
4410 }
4412 /* Make room for this entry. */
4414 /* After the 8192nd entry, room for two entries
4415 is allocated. */
4421 }
4423 }
4425 /* We also need to make an entry in the .rela.plt section. */
4427 {
4431 {
4432 /* Allocate space for the unloaded relocations. */
4434 {
4437 {
4441 }
4446 }
4448 /* Every PLT entry has an associated GOT entry in
4449 .got.plt. */
4451 }
4453 }
4454 }
4455 else
4459 {
4462 }
4463 }
4464 }
4465 else
4466 {
4469 }
4473 {
4474 /* Make sure this symbol is output as a dynamic symbol. */
4477 {
4480 }
4484 /* If just an LD reloc, we'll just use htab->tlsld_got.offset. */
4486 else
4487 {
4488 bfd_boolean dyn;
4491 {
4500 }
4501 else
4509 {
4510 /* All the entries we allocated need relocs.
4511 Except LD only needs one. */
4515 }
4516 }
4517 }
4518 else
4524 /* In the shared -Bsymbolic case, discard space allocated for
4525 dynamic pc-relative relocs against symbols which turn out to be
4526 defined in regular objects. For the normal shared case, discard
4527 space for relocs that have become local due to symbol visibility
4528 changes. */
4531 {
4532 /* Relocs that use pc_count are those that appear on a call insn,
4533 or certain REL relocs (see MUST_BE_DYN_RELOC) that can be
4534 generated via assembly. We want calls to protected symbols to
4535 resolve directly to the function rather than going via the plt.
4536 If people want function pointer comparisons to work as expected
4537 then they should avoid writing weird assembly. */
4539 {
4543 {
4548 else
4550 }
4551 }
4553 /* Also discard relocs on undefined weak syms with non-default
4554 visibility. */
4557 {
4561 /* Make sure undefined weak symbols are output as a dynamic
4562 symbol in PIEs. */
4565 {
4568 }
4569 }
4570 }
4572 {
4573 /* For the non-shared case, discard space for relocs against
4574 symbols which turn out to need copy relocs or are not
4575 dynamic. */
4580 {
4581 /* Make sure this symbol is output as a dynamic symbol.
4582 Undefined weak syms won't yet be marked as dynamic. */
4585 {
4588 }
4590 /* If that succeeded, we know we'll be keeping all the
4591 relocs. */
4594 }
4598 keep: ;
4599 }
4601 /* Finally, allocate space. */
4603 {
4606 }
4609 }
4611 /* Find any dynamic relocs that apply to read-only sections. */
4613 static bfd_boolean
4615 {
4625 {
4631 {
4634 /* Not an error, just cut short the traversal. */
4636 }
4637 }
4639 }
4641 /* Set the sizes of the dynamic sections. */
4643 static bfd_boolean
4646 {
4649 bfd_boolean relocs;
4652 #ifdef DEBUG
4654 #endif
4660 {
4661 /* Set the contents of the .interp section to the interpreter. */
4663 {
4668 }
4669 }
4676 /* Set up .got offsets for local syms, and space for local dynamic
4677 relocs. */
4679 {
4683 bfd_size_type locsymcount;
4690 {
4697 {
4700 {
4701 /* Input section has been discarded, either because
4702 it is a copy of a linkonce section or due to
4703 linker script /DISCARD/, so we'll be discarding
4704 the relocs too. */
4705 }
4707 {
4714 }
4715 }
4716 }
4728 {
4730 {
4731 /* If just an LD reloc, we'll just use
4732 htab->tlsld_got.offset. */
4735 }
4736 else
4737 {
4740 {
4747 }
4748 else
4754 }
4755 }
4756 else
4758 }
4761 {
4765 }
4766 else
4769 /* Allocate space for global sym dynamic relocs. */
4773 {
4776 /* If we haven't allocated the header, do so now. When we get here,
4777 for old plt/got the got size will be 0 to 32764 (not allocated),
4778 or 32780 to 65536 (header allocated). For new plt/got, the
4779 corresponding ranges are 0 to 32768 and 32780 to 65536. */
4781 {
4786 }
4789 }
4792 {
4794 /* Space for the branch table. */
4796 /* Pad out to align the start of PLTresolve. */
4801 {
4808 {
4817 }
4823 {
4832 }
4833 }
4834 }
4836 /* We've now determined the sizes of the various dynamic sections.
4837 Allocate memory for them. */
4840 {
4853 {
4854 /* We'd like to strip these sections if they aren't needed, but if
4855 we've exported dynamic symbols from them we must leave them.
4856 It's too late to tell BFD to get rid of the symbols. */
4859 /* Strip this section if we don't need it; see the
4860 comment below. */
4861 }
4864 {
4865 /* Strip these too. */
4866 }
4868 {
4870 {
4871 /* Remember whether there are any relocation sections. */
4874 /* We use the reloc_count field as a counter if we need
4875 to copy relocs into the output file. */
4877 }
4878 }
4879 else
4880 {
4881 /* It's not one of our sections, so don't allocate space. */
4883 }
4886 {
4887 /* If we don't need this section, strip it from the
4888 output file. This is mostly to handle .rela.bss and
4889 .rela.plt. We must create both sections in
4890 create_dynamic_sections, because they must be created
4891 before the linker maps input sections to output
4892 sections. The linker does that before
4893 adjust_dynamic_symbol is called, and it is that
4894 function which decides whether anything needs to go
4895 into these sections. */
4898 }
4903 /* Allocate memory for the section contents. */
4907 }
4910 {
4911 /* Add some entries to the .dynamic section. We fill in the
4912 values later, in ppc_elf_finish_dynamic_sections, but we
4913 must add the entries now so that we get the correct size for
4914 the .dynamic section. The DT_DEBUG entry is filled in by the
4915 dynamic linker and used by the debugger. */
4916 #define add_dynamic_entry(TAG, VAL) \
4917 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
4920 {
4923 }
4926 {
4932 }
4935 {
4938 }
4941 {
4946 }
4948 /* If any dynamic relocs apply to a read-only section, then we
4949 need a DT_TEXTREL entry. */
4952 info);
4955 {
4958 }
4959 }
4960 #undef add_dynamic_entry
4963 }
4964 \f
4965 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
4968 {
4977 };
4980 {
4985 };
4987 static bfd_boolean
4992 {
4993 struct one_fixup
4994 {
4997 bfd_vma toff;
4998 bfd_vma trampoff;
4999 };
5007 bfd_boolean changed;
5009 bfd_size_type trampoff;
5014 /* Nothing to do if there are no relocations, and no need to do
5015 anything with non-alloc sections. */
5022 /* Space for a branch around any trampolines. */
5027 /* Get a copy of the native relocations. */
5038 {
5050 {
5065 }
5067 /* Get the value of the symbol referred to by the reloc. */
5069 {
5070 /* A local symbol. */
5073 /* Read this BFD's local symbols. */
5075 {
5083 }
5091 else
5096 }
5097 else
5098 {
5099 /* Global symbol handling. */
5114 {
5118 {
5120 {
5123 }
5124 else
5125 {
5128 }
5129 }
5130 }
5132 ;
5135 {
5138 }
5139 else
5143 }
5145 /* If the branch and target are in the same section, you have
5146 no hope of adding stubs. We'll error out later should the
5147 branch overflow. */
5151 /* There probably isn't any reason to handle symbols in
5152 SEC_MERGE sections; SEC_MERGE doesn't seem a likely
5153 attribute for a code section, and we are only looking at
5154 branches. However, implement it correctly here as a
5155 reference for other target relax_section functions. */
5157 {
5158 /* At this stage in linking, no SEC_MERGE symbol has been
5159 adjusted, so all references to such symbols need to be
5160 passed through _bfd_merged_section_offset. (Later, in
5161 relocate_section, all SEC_MERGE symbols *except* for
5162 section symbols have been adjusted.)
5164 gas may reduce relocations against symbols in SEC_MERGE
5165 sections to a relocation against the section symbol when
5166 the original addend was zero. When the reloc is against
5167 a section symbol we should include the addend in the
5168 offset passed to _bfd_merged_section_offset, since the
5169 location of interest is the original symbol. On the
5170 other hand, an access to "sym+addend" where "sym" is not
5171 a section symbol should not include the addend; Such an
5172 access is presumed to be an offset from "sym"; The
5173 location of interest is just "sym". */
5179 toff);
5183 }
5184 /* PLTREL24 addends are special. */
5188 /* Attempted -shared link of non-pic code loses. */
5197 /* If the branch is in range, no need to do anything. */
5201 /* Look for an existing fixup to this address. */
5207 {
5213 /* Oh dear, we can't reach a trampoline. Don't try to add
5214 one. We'll report an error later. */
5218 {
5222 }
5223 else
5224 {
5228 }
5237 /* Hijack the old relocation. Since we need two
5238 relocations for this use a "composite" reloc. */
5240 stub_rtype);
5243 /* Record the fixup so we don't do it again this section. */
5252 }
5253 else
5254 {
5259 /* Nop out the reloc, since we're finalizing things here. */
5261 }
5263 /* Get the section contents. */
5265 {
5266 /* Get cached copy if it exists. */
5269 else
5270 {
5271 /* Go get them off disk. */
5274 }
5275 }
5277 /* Fix up the existing branch to hit the trampoline. */
5280 {
5298 }
5299 }
5301 /* Write out the trampolines. */
5304 {
5307 bfd_vma val;
5310 do
5311 {
5315 }
5323 /* Branch around the trampolines. */
5331 {
5334 }
5335 else
5336 {
5339 }
5343 {
5345 i++;
5349 }
5351 }
5355 {
5358 else
5359 {
5360 /* Cache the symbols for elf_link_input_bfd. */
5362 }
5363 }
5367 {
5370 else
5371 {
5372 /* Cache the section contents for elf_link_input_bfd. */
5374 }
5375 }
5378 {
5381 else
5383 }
5388 error_return:
5398 }
5399 \f
5400 /* What to do when ld finds relocations against symbols defined in
5401 discarded sections. */
5403 static unsigned int
5405 {
5413 }
5414 \f
5415 /* Fill in the address for a pointer generated in a linker section. */
5417 static bfd_vma
5421 bfd_vma relocation,
5423 {
5429 {
5430 /* Handle global symbol. */
5436 }
5437 else
5438 {
5439 /* Handle local symbol. */
5444 }
5448 lsect);
5451 /* Offset will always be a multiple of four, so use the bottom bit
5452 as a "written" flag. */
5454 {
5459 }
5465 #ifdef DEBUG
5469 #endif
5471 /* Subtract out the addend, because it will get added back in by the normal
5472 processing. */
5474 }
5476 /* The RELOCATE_SECTION function is called by the ELF backend linker
5477 to handle the relocations for a section.
5479 The relocs are always passed as Rela structures; if the section
5480 actually uses Rel structures, the r_addend field will always be
5481 zero.
5483 This function is responsible for adjust the section contents as
5484 necessary, and (if using Rela relocs and generating a
5485 relocatable output file) adjusting the reloc addend as
5486 necessary.
5488 This function does not have to worry about setting the reloc
5489 address or the reloc symbol index.
5491 LOCAL_SYMS is a pointer to the swapped in local symbols.
5493 LOCAL_SECTIONS is an array giving the section in the input file
5494 corresponding to the st_shndx field of each local symbol.
5496 The global hash table entry for the global symbols can be found
5497 via elf_sym_hashes (input_bfd).
5499 When generating relocatable output, this function must handle
5500 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
5501 going to be the section symbol corresponding to the output
5502 section, which means that the addend must be adjusted
5503 accordingly. */
5505 static bfd_boolean
5514 {
5520 Elf_Internal_Rela outrel;
5526 #ifdef DEBUG
5532 #endif
5537 {
5544 {
5550 {
5551 /* R_PPC_PLTREL24 is rather special. If non-zero, the
5552 addend specifies the GOT pointer offset within .got2. */
5554 }
5555 }
5557 }
5559 /* Initialize howto table if not already done. */
5570 {
5572 bfd_vma addend;
5573 bfd_reloc_status_type r;
5580 bfd_vma relocation;
5582 bfd_boolean unresolved_reloc;
5583 bfd_boolean warned;
5595 {
5601 }
5602 else
5603 {
5610 }
5612 /* TLS optimizations. Replace instruction sequences and relocs
5613 based on information we collected in tls_optimize. We edit
5614 RELOCS so that --emit-relocs will output something sensible
5615 for the final instruction stream. */
5619 {
5623 {
5627 }
5628 }
5630 /* Ensure reloc mapping code below stays sane. */
5641 {
5649 {
5650 bfd_vma insn;
5657 }
5663 {
5672 else
5675 /* add -> addi. */
5681 /* load and store indexed -> dform. */
5685 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
5690 /* lwax -> lwa. */
5692 else
5698 /* Was PPC_TLS which sits on insn boundary, now
5699 PPC_TPREL16_LO which is at insn+2. */
5701 }
5714 {
5715 tls_gdld_hi:
5719 else
5720 {
5724 }
5726 }
5739 {
5740 tls_get_addr_check:
5742 {
5747 bfd_vma offset;
5749 /* The next instruction should be a call to
5750 __tls_get_addr. Peek at the reloc to be sure. */
5768 /* OK, it checks out. Replace the call. */
5773 {
5774 /* IE */
5783 }
5784 else
5785 {
5786 /* LE */
5790 {
5791 /* Was an LD reloc. */
5794 }
5798 R_PPC_TPREL16_LO);
5801 }
5805 {
5806 /* We changed the symbol on an LD reloc. Start over
5807 in order to get h, sym, sec etc. right. */
5808 rel--;
5810 }
5811 }
5812 }
5814 }
5816 /* Handle other relocations that tweak non-addend part of insn. */
5819 {
5823 /* Branch taken prediction relocations. */
5827 /* Fall thru */
5829 /* Branch not taken prediction relocations. */
5840 /* Invert 'y' bit if not the default. */
5846 }
5854 {
5871 /* GOT16 relocations. Like an ADDR16 using the symbol's
5872 address in the GOT as relocation value instead of the
5873 symbol's value itself. Also, create a GOT entry for the
5874 symbol and put the symbol value there. */
5907 dogot:
5908 {
5909 /* Relocation is to the entry for this symbol in the global
5910 offset table. */
5911 bfd_vma off;
5924 {
5925 bfd_boolean dyn;
5930 /* This is actually a static link, or it is a
5931 -Bsymbolic link and the symbol is defined
5932 locally, or the symbol was forced to be local
5933 because of a version file. */
5934 ;
5935 else
5936 {
5939 }
5941 }
5942 else
5943 {
5947 }
5949 /* The offset must always be a multiple of 4. We use the
5950 least significant bit to record whether we have already
5951 processed this entry. */
5955 else
5956 {
5967 /* We might have multiple got entries for this sym.
5968 Initialize them all. */
5969 do
5970 {
5974 {
5977 }
5979 {
5982 }
5984 {
5987 }
5989 {
5992 }
5994 /* Generate relocs for the dynamic linker. */
5999 {
6005 {
6008 {
6015 outrel.r_info
6017 }
6018 }
6025 else
6028 {
6032 }
6037 }
6039 /* Init the .got section contents if we're not
6040 emitting a reloc. */
6041 else
6042 {
6048 {
6054 {
6058 }
6059 }
6062 }
6067 }
6072 }
6078 {
6080 {
6086 {
6090 {
6093 }
6094 }
6095 }
6096 }
6101 /* Addends on got relocations don't make much sense.
6102 x+off@got is actually x@got+off, and since the got is
6103 generated by a hash table traversal, the value in the
6104 got at entry m+n bears little relation to the entry m. */
6108 input_bfd,
6109 input_section,
6112 sym_name);
6113 }
6116 /* Relocations that need no special processing. */
6118 /* It makes no sense to point a local relocation
6119 at a symbol not in this object. */
6121 {
6124 input_bfd,
6125 input_section,
6127 TRUE))
6130 }
6140 /* Relocations that may need to be propagated if this is a shared
6141 object. */
6147 /* The TPREL16 relocs shouldn't really be used in shared
6148 libs as they will result in DT_TEXTREL being set, but
6149 support them anyway. */
6176 /* If these relocations are not to a named symbol, they can be
6177 handled right here, no need to bother the dynamic linker. */
6181 /* fall through */
6183 /* Relocations that always need to be propagated if this is a shared
6184 object. */
6196 /* r_symndx will be zero only for relocs against symbols
6197 from removed linkonce sections, or sections discarded by
6198 a linker script. */
6199 dodyn:
6202 /* Fall thru. */
6206 /* Fall thru. */
6214 || (ELIMINATE_COPY_RELOCS
6221 {
6224 #ifdef DEBUG
6229 #endif
6231 /* When generating a shared object, these relocations
6232 are copied into the output file to be resolved at run
6233 time. */
6235 {
6238 name = (bfd_elf_string_from_elf_section
6247 input_section),
6252 }
6268 {
6272 }
6273 else
6274 {
6279 else
6280 {
6286 {
6289 }
6290 else
6291 {
6294 /* We are turning this relocation into one
6295 against a section symbol. It would be
6296 proper to subtract the symbol's value,
6297 osec->vma, from the emitted reloc addend,
6298 but ld.so expects buggy relocs. */
6302 #ifdef DEBUG
6307 #endif
6308 }
6311 }
6312 }
6321 /* This reloc will be computed at runtime. We clear the memory
6322 so that it contains predictable value. */
6326 {
6330 }
6331 }
6336 {
6343 else
6348 }
6351 /* Fall thru */
6357 /* Fall thru */
6360 relax32:
6361 {
6368 /* We're clearing the bits for R_PPC_ADDR16_HA
6369 and R_PPC_ADDR16_LO here. */
6373 /* t0 is HA, t1 is LO */
6380 }
6383 /* Indirect .sdata relocation. */
6386 relocation
6391 /* Indirect .sdata2 relocation. */
6394 relocation
6399 /* Handle the TOC16 reloc. We want to use the offset within the .got
6400 section, not the actual VMA. This is appropriate when generating
6401 an embedded ELF object, for which the .got section acts like the
6402 AIX .toc section. */
6413 /* Relocation is to the entry for this symbol in the
6414 procedure linkage table. */
6415 {
6421 {
6422 /* We didn't make a PLT entry for this symbol. This
6423 happens when statically linking PIC code, or when
6424 using -Bsymbolic. */
6426 }
6433 else
6437 }
6440 /* Relocate against _SDA_BASE_. */
6442 {
6452 {
6456 input_bfd,
6457 sym_name,
6459 name);
6460 }
6465 }
6468 /* Relocate against _SDA2_BASE_. */
6470 {
6478 {
6482 input_bfd,
6483 sym_name,
6485 name);
6490 }
6495 }
6498 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
6501 {
6512 {
6518 }
6522 {
6528 }
6532 {
6534 }
6536 else
6537 {
6541 input_bfd,
6542 sym_name,
6544 name);
6549 }
6556 }
6557 }
6560 /* Relocate against the beginning of the section. */
6569 /* Negative relocations. */
6595 input_bfd,
6597 sym_name);
6602 }
6604 /* Do any further special processing. */
6606 {
6623 /* It's just possible that this symbol is a weak symbol
6624 that's not actually defined anywhere. In that case,
6625 'sec' would be NULL, and we should leave the symbol
6626 alone (it will be set to zero elsewhere in the link). */
6628 /* Add 0x10000 if sign bit in 0:15 is set.
6629 Bits 0:15 are not used. */
6632 }
6634 #ifdef DEBUG
6639 sym_name,
6640 r_symndx,
6643 #endif
6648 {
6651 input_bfd,
6652 input_section,
6655 sym_name);
6657 }
6660 input_bfd,
6661 input_section,
6662 contents,
6664 relocation,
6665 addend);
6668 {
6670 {
6676 {
6677 /* Assume this is a call protected by other code that
6678 detect the symbol is undefined. If this is the case,
6679 we can safely ignore the overflow. If not, the
6680 program is hosed anyway, and a little warning isn't
6681 going to help. */
6684 }
6688 sym_name,
6691 input_bfd,
6692 input_section,
6695 }
6696 else
6697 {
6703 }
6704 }
6705 }
6707 #ifdef DEBUG
6709 #endif
6712 }
6713 \f
6714 #define PPC_LO(v) ((v) & 0xffff)
6715 #define PPC_HI(v) (((v) >> 16) & 0xffff)
6716 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
6718 /* Finish up dynamic symbol handling. We set the contents of various
6719 dynamic sections here. */
6721 static bfd_boolean
6726 {
6729 bfd_boolean doneone;
6731 #ifdef DEBUG
6734 #endif
6742 {
6744 {
6745 Elf_Internal_Rela rela;
6747 bfd_vma reloc_index;
6751 else
6752 {
6758 }
6760 /* This symbol has an entry in the procedure linkage table.
6761 Set it up. */
6763 {
6764 bfd_vma got_offset;
6767 /* The first three entries in .got.plt are reserved. */
6770 /* Use the right PLT. */
6774 /* Fill in the .plt on VxWorks. */
6776 {
6786 }
6787 else
6788 {
6789 bfd_vma got_loc
6790 = (got_offset
6803 }
6810 /* This instruction is an immediate load. The value loaded is
6811 the byte offset of the R_PPC_JMP_SLOT relocation from the
6812 start of the .rela.plt section. The value is stored in the
6813 low-order 16 bits of the load instruction. */
6814 /* NOTE: It appears that this is now an index rather than a
6815 prescaled offset. */
6819 /* This instruction is a PC-relative branch whose target is
6820 the start of the PLT section. The address of this branch
6821 instruction is 20 bytes beyond the start of this PLT entry.
6822 The address is encoded in bits 6-29, inclusive. The value
6823 stored is right-shifted by two bits, permitting a 26-bit
6824 offset. */
6834 /* Fill in the GOT entry corresponding to this PLT slot with
6835 the address immediately after the the "bctr" instruction
6836 in this PLT entry. */
6843 {
6844 /* Fill in a couple of entries in .rela.plt.unloaded. */
6850 /* Provide the @ha relocation for the first instruction. */
6855 R_PPC_ADDR16_HA);
6860 /* Provide the @l relocation for the second instruction. */
6865 R_PPC_ADDR16_LO);
6870 /* Provide a relocation for the GOT entry corresponding to this
6871 PLT slot. Point it at the middle of the .plt entry. */
6876 R_PPC_ADDR32);
6879 }
6881 /* VxWorks uses non-standard semantics for R_PPC_JMP_SLOT.
6882 In particular, the offset for the relocation is not the
6883 address of the PLT entry for this function, as specified
6884 by the ABI. Instead, the offset is set to the address of
6885 the GOT slot for this function. See EABI 4.4.4.1. */
6890 }
6891 else
6892 {
6897 {
6898 /* We don't need to fill in the .plt. The ppc dynamic
6899 linker will fill it in. */
6900 }
6901 else
6902 {
6908 }
6909 }
6911 /* Fill in the entry in the .rela.plt section. */
6920 {
6921 /* Mark the symbol as undefined, rather than as defined in
6922 the .plt section. Leave the value alone. */
6924 /* If the symbol is weak, we do need to clear the value.
6925 Otherwise, the PLT entry would provide a definition for
6926 the symbol even if the symbol wasn't defined anywhere,
6927 and so the symbol would never be NULL. */
6930 }
6932 }
6935 {
6936 bfd_vma plt;
6945 {
6960 {
6969 }
6970 else
6971 {
6980 }
6981 }
6982 else
6983 {
6993 /* We only need one non-PIC glink stub. */
6995 }
6996 }
6997 else
6999 }
7002 {
7004 Elf_Internal_Rela rela;
7007 /* This symbols needs a copy reloc. Set it up. */
7009 #ifdef DEBUG
7011 #endif
7017 else
7028 }
7030 #ifdef DEBUG
7032 #endif
7034 /* Mark some specially defined symbols as absolute. */
7043 }
7044 \f
7045 static enum elf_reloc_type_class
7047 {
7049 {
7060 }
7061 }
7062 \f
7063 /* Finish up the dynamic sections. */
7065 static bfd_boolean
7068 {
7072 bfd_vma got;
7075 #ifdef DEBUG
7077 #endif
7084 else
7094 {
7102 {
7103 Elf_Internal_Dyn dyn;
7109 {
7113 else
7133 {
7137 }
7142 }
7145 }
7146 }
7148 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
7149 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
7151 {
7153 bfd_vma val;
7165 }
7167 /* Fill in the first entry in the VxWorks procedure linkage table. */
7169 {
7170 /* Use the right PLT. */
7176 {
7177 bfd_vma got_value =
7187 }
7188 else
7189 {
7192 }
7201 {
7202 Elf_Internal_Rela rela;
7207 /* Output the @ha relocation for the first instruction. */
7216 /* Output the @l relocation for the second instruction. */
7225 /* Fix up the remaining relocations. They may have the wrong
7226 symbol index for _G_O_T_ or _P_L_T_ depending on the order
7227 in which symbols were output. */
7229 {
7230 Elf_Internal_Rela rel;
7246 }
7247 }
7248 }
7251 {
7254 bfd_vma res0;
7257 /*
7258 * PIC glink code is the following:
7259 *
7260 * # ith PLT code stub.
7261 * addis 11,30,(plt+(i-1)*4-got)@ha
7262 * lwz 11,(plt+(i-1)*4-got)@l(11)
7263 * mtctr 11
7264 * bctr
7265 *
7266 * # A table of branches, one for each plt entry.
7267 * # The idea is that the plt call stub loads ctr (and r11) with these
7268 * # addresses, so (r11 - res_0) gives the plt index * 4.
7269 * res_0: b PLTresolve
7270 * res_1: b PLTresolve
7271 * .
7272 * # Some number of entries towards the end can be nops
7273 * res_n_m3: nop
7274 * res_n_m2: nop
7275 * res_n_m1:
7276 *
7277 * PLTresolve:
7278 * addis 11,11,(1f-res_0)@ha
7279 * mflr 0
7280 * bcl 20,31,1f
7281 * 1: addi 11,11,(1b-res_0)@l
7282 * mflr 12
7283 * mtlr 0
7284 * sub 11,11,12 # r11 = index * 4
7285 * addis 12,12,(got+4-1b)@ha
7286 * lwz 0,(got+4-1b)@l(12) # got[1] address of dl_runtime_resolve
7287 * lwz 12,(got+8-1b)@l(12) # got[2] contains the map address
7288 * mtctr 0
7289 * add 0,11,11
7290 * add 11,0,11 # r11 = index * 12 = reloc offset.
7291 * bctr
7292 */
7294 {
7295 ADDIS_11_11,
7296 MFLR_0,
7297 BCL_20_31,
7298 ADDI_11_11,
7299 MFLR_12,
7300 MTLR_0,
7301 SUB_11_11_12,
7302 ADDIS_12_12,
7303 LWZ_0_12,
7304 LWZ_12_12,
7305 MTCTR_0,
7306 ADD_0_11_11,
7307 ADD_11_0_11,
7308 BCTR,
7309 NOP,
7310 NOP
7311 };
7314 {
7315 LIS_12,
7316 ADDIS_11_11,
7317 LWZ_0_12,
7318 ADDI_11_11,
7319 MTCTR_0,
7320 ADD_0_11_11,
7321 LWZ_12_12,
7322 ADD_11_0_11,
7323 BCTR,
7324 NOP,
7325 NOP,
7326 NOP,
7327 NOP,
7328 NOP,
7329 NOP,
7330 NOP
7331 };
7338 /* Build the branch table, one for each plt entry (less one),
7339 and perhaps some padding. */
7345 {
7348 }
7350 {
7353 }
7359 /* Last comes the PLTresolve stub. */
7361 {
7362 bfd_vma bcl;
7365 {
7368 }
7382 {
7387 }
7388 else
7389 {
7394 }
7395 }
7396 else
7397 {
7399 {
7402 }
7412 {
7417 }
7418 else
7419 {
7424 }
7425 }
7426 }
7429 }
7430 \f
7431 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
7433 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
7435 #define ELF_ARCH bfd_arch_powerpc
7436 #define ELF_MACHINE_CODE EM_PPC
7437 #ifdef __QNXTARGET__
7438 #define ELF_MAXPAGESIZE 0x1000
7439 #else
7440 #define ELF_MAXPAGESIZE 0x10000
7441 #endif
7442 #define ELF_MINPAGESIZE 0x1000
7443 #define ELF_COMMONPAGESIZE 0x1000
7444 #define elf_info_to_howto ppc_elf_info_to_howto
7446 #ifdef EM_CYGNUS_POWERPC
7447 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
7448 #endif
7450 #ifdef EM_PPC_OLD
7451 #define ELF_MACHINE_ALT2 EM_PPC_OLD
7452 #endif
7454 #define elf_backend_plt_not_loaded 1
7455 #define elf_backend_can_gc_sections 1
7456 #define elf_backend_can_refcount 1
7457 #define elf_backend_rela_normal 1
7459 #define bfd_elf32_mkobject ppc_elf_mkobject
7460 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
7461 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
7462 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
7463 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
7464 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create
7466 #define elf_backend_object_p ppc_elf_object_p
7467 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
7468 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
7469 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
7470 #define elf_backend_relocate_section ppc_elf_relocate_section
7471 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
7472 #define elf_backend_check_relocs ppc_elf_check_relocs
7473 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol
7474 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
7475 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
7476 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
7477 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
7478 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
7479 #define elf_backend_fake_sections ppc_elf_fake_sections
7480 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
7481 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
7482 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
7483 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
7484 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing
7485 #define elf_backend_final_write_processing ppc_elf_final_write_processing
7486 #define elf_backend_write_section ppc_elf_write_section
7487 #define elf_backend_get_sec_type_attr ppc_elf_get_sec_type_attr
7488 #define elf_backend_plt_sym_val ppc_elf_plt_sym_val
7489 #define elf_backend_action_discarded ppc_elf_action_discarded
7493 /* VxWorks Target */
7495 #undef TARGET_LITTLE_SYM
7496 #undef TARGET_LITTLE_NAME
7498 #undef TARGET_BIG_SYM
7499 #define TARGET_BIG_SYM bfd_elf32_powerpc_vxworks_vec
7500 #undef TARGET_BIG_NAME
7503 /* VxWorks uses the elf default section flags for .plt. */
7506 {
7514 }
7516 /* Like ppc_elf_link_hash_table_create, but overrides
7517 appropriately for VxWorks. */
7520 {
7525 {
7533 }
7535 }
7537 /* Tweak magic VxWorks symbols as they are loaded. */
7538 static bfd_boolean
7546 {
7548 valp))
7552 }
7554 static void
7556 {
7559 }
7561 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
7562 define it. */
7563 #undef elf_backend_want_plt_sym
7564 #define elf_backend_want_plt_sym 1
7565 #undef elf_backend_want_got_plt
7566 #define elf_backend_want_got_plt 1
7567 #undef elf_backend_got_symbol_offset
7568 #define elf_backend_got_symbol_offset 0
7569 #undef elf_backend_plt_not_loaded
7570 #define elf_backend_plt_not_loaded 0
7571 #undef elf_backend_plt_readonly
7572 #define elf_backend_plt_readonly 1
7573 #undef elf_backend_got_header_size
7574 #define elf_backend_got_header_size 12
7576 #undef bfd_elf32_bfd_link_hash_table_create
7577 #define bfd_elf32_bfd_link_hash_table_create \
7578 ppc_elf_vxworks_link_hash_table_create
7579 #undef elf_backend_add_symbol_hook
7580 #define elf_backend_add_symbol_hook \
7581 ppc_elf_vxworks_add_symbol_hook
7582 #undef elf_backend_link_output_symbol_hook
7583 #define elf_backend_link_output_symbol_hook \
7584 elf_vxworks_link_output_symbol_hook
7585 #undef elf_backend_final_write_processing
7586 #define elf_backend_final_write_processing \
7587 ppc_elf_vxworks_final_write_processing
7588 #undef elf_backend_get_sec_type_attr
7589 #define elf_backend_get_sec_type_attr \
7590 ppc_elf_vxworks_get_sec_type_attr
7591 #undef elf_backend_emit_relocs
7592 #define elf_backend_emit_relocs \
7593 elf_vxworks_emit_relocs
7595 #undef elf32_bed
7596 #define elf32_bed ppc_elf_vxworks_bed