| blob | 68804ad806c56b1063160638d122b79b103c10d5 |
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 3 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. */
24 /* This file is based on a preliminary PowerPC ELF ABI. The
25 information may not match the final PowerPC ELF ABI. It includes
26 suggestions from the in-progress Embedded PowerPC ABI, and that
27 information may also not match. */
30 #include <stdarg.h>
39 /* RELA relocations are used here. */
41 static bfd_reloc_status_type ppc_elf_addr16_ha_reloc
43 static bfd_reloc_status_type ppc_elf_unhandled_reloc
46 /* Branch prediction bit for branch taken relocs. */
47 #define BRANCH_PREDICT_BIT 0x200000
48 /* Mask to set RA in memory instructions. */
49 #define RA_REGISTER_MASK 0x001f0000
50 /* Value to shift register by to insert RA. */
51 #define RA_REGISTER_SHIFT 16
53 /* The name of the dynamic interpreter. This is put in the .interp
54 section. */
57 /* For old-style PLT. */
58 /* The number of single-slot PLT entries (the rest use two slots). */
59 #define PLT_NUM_SINGLE_ENTRIES 8192
61 /* For new-style .glink and .plt. */
62 #define GLINK_PLTRESOLVE 16*4
63 #define GLINK_ENTRY_SIZE 4*4
65 /* VxWorks uses its own plt layout, filled in by the static linker. */
67 /* The standard VxWorks PLT entry. */
68 #define VXWORKS_PLT_ENTRY_SIZE 32
69 static const bfd_vma ppc_elf_vxworks_plt_entry
71 {
80 };
81 static const bfd_vma ppc_elf_vxworks_pic_plt_entry
83 {
92 };
94 /* The initial VxWorks PLT entry. */
95 #define VXWORKS_PLT_INITIAL_ENTRY_SIZE 32
96 static const bfd_vma ppc_elf_vxworks_plt0_entry
98 {
107 };
108 static const bfd_vma ppc_elf_vxworks_pic_plt0_entry
110 {
119 };
121 /* For executables, we have some additional relocations in
122 .rela.plt.unloaded, for the kernel loader. */
124 /* The number of non-JMP_SLOT relocations per PLT0 slot. */
125 #define VXWORKS_PLT_NON_JMP_SLOT_RELOCS 3
126 /* The number of relocations in the PLTResolve slot. */
127 #define VXWORKS_PLTRESOLVE_RELOCS 2
128 /* The number of relocations in the PLTResolve slot when when creating
129 a shared library. */
130 #define VXWORKS_PLTRESOLVE_RELOCS_SHLIB 0
132 /* Some instructions. */
133 #define ADDIS_11_11 0x3d6b0000
134 #define ADDIS_11_30 0x3d7e0000
135 #define ADDIS_12_12 0x3d8c0000
136 #define ADDI_11_11 0x396b0000
137 #define ADD_0_11_11 0x7c0b5a14
138 #define ADD_11_0_11 0x7d605a14
139 #define B 0x48000000
140 #define BCL_20_31 0x429f0005
141 #define BCTR 0x4e800420
142 #define LIS_11 0x3d600000
143 #define LIS_12 0x3d800000
144 #define LWZU_0_12 0x840c0000
145 #define LWZ_0_12 0x800c0000
146 #define LWZ_11_11 0x816b0000
147 #define LWZ_11_30 0x817e0000
148 #define LWZ_12_12 0x818c0000
149 #define MFLR_0 0x7c0802a6
150 #define MFLR_12 0x7d8802a6
151 #define MTCTR_0 0x7c0903a6
152 #define MTCTR_11 0x7d6903a6
153 #define MTLR_0 0x7c0803a6
154 #define NOP 0x60000000
155 #define SUB_11_11_12 0x7d6c5850
157 /* Offset of tp and dtp pointers from start of TLS block. */
158 #define TP_OFFSET 0x7000
159 #define DTP_OFFSET 0x8000
160 \f
164 /* This reloc does nothing. */
179 /* A standard 32 bit relocation. */
194 /* An absolute 26 bit branch; the lower two bits must be zero.
195 FIXME: we don't check that, we just clear them. */
210 /* A standard 16 bit relocation. */
225 /* A 16 bit relocation without overflow. */
240 /* The high order 16 bits of an address. */
255 /* The high order 16 bits of an address, plus 1 if the contents of
256 the low 16 bits, treated as a signed number, is negative. */
271 /* An absolute 16 bit branch; the lower two bits must be zero.
272 FIXME: we don't check that, we just clear them. */
287 /* An absolute 16 bit branch, for which bit 10 should be set to
288 indicate that the branch is expected to be taken. The lower two
289 bits must be zero. */
304 /* An absolute 16 bit branch, for which bit 10 should be set to
305 indicate that the branch is not expected to be taken. The lower
306 two bits must be zero. */
321 /* A relative 26 bit branch; the lower two bits must be zero. */
336 /* A relative 16 bit branch; the lower two bits must be zero. */
351 /* A relative 16 bit branch. Bit 10 should be set to indicate that
352 the branch is expected to be taken. The lower two bits must be
353 zero. */
368 /* A relative 16 bit branch. Bit 10 should be set to indicate that
369 the branch is not expected to be taken. The lower two bits must
370 be zero. */
385 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the
386 symbol. */
401 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
402 the symbol. */
417 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
418 the symbol. */
433 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
434 the symbol. */
449 /* Like R_PPC_REL24, but referring to the procedure linkage table
450 entry for the symbol. */
465 /* This is used only by the dynamic linker. The symbol should exist
466 both in the object being run and in some shared library. The
467 dynamic linker copies the data addressed by the symbol from the
468 shared library into the object, because the object being
469 run has to have the data at some particular address. */
484 /* Like R_PPC_ADDR32, but used when setting global offset table
485 entries. */
500 /* Marks a procedure linkage table entry for a symbol. */
515 /* Used only by the dynamic linker. When the object is run, this
516 longword is set to the load address of the object, plus the
517 addend. */
532 /* Like R_PPC_REL24, but uses the value of the symbol within the
533 object rather than the final value. Normally used for
534 _GLOBAL_OFFSET_TABLE_. */
549 /* Like R_PPC_ADDR32, but may be unaligned. */
564 /* Like R_PPC_ADDR16, but may be unaligned. */
579 /* 32-bit PC relative */
594 /* 32-bit relocation to the symbol's procedure linkage table.
595 FIXME: not supported. */
610 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
611 FIXME: not supported. */
626 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
627 the symbol. */
642 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
643 the symbol. */
658 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
659 the symbol. */
674 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
675 small data items. */
690 /* 16-bit section relative relocation. */
705 /* 16-bit lower half section relative relocation. */
720 /* 16-bit upper half section relative relocation. */
735 /* 16-bit upper half adjusted section relative relocation. */
750 /* Marker reloc for TLS. */
765 /* Computes the load module index of the load module that contains the
766 definition of its TLS sym. */
781 /* Computes a dtv-relative displacement, the difference between the value
782 of sym+add and the base address of the thread-local storage block that
783 contains the definition of sym, minus 0x8000. */
798 /* A 16 bit dtprel reloc. */
813 /* Like DTPREL16, but no overflow. */
828 /* Like DTPREL16_LO, but next higher group of 16 bits. */
843 /* Like DTPREL16_HI, but adjust for low 16 bits. */
858 /* Computes a tp-relative displacement, the difference between the value of
859 sym+add and the value of the thread pointer (r13). */
874 /* A 16 bit tprel reloc. */
889 /* Like TPREL16, but no overflow. */
904 /* Like TPREL16_LO, but next higher group of 16 bits. */
919 /* Like TPREL16_HI, but adjust for low 16 bits. */
934 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
935 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset
936 to the first entry. */
951 /* Like GOT_TLSGD16, but no overflow. */
966 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */
981 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */
996 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
997 with values (sym+add)@dtpmod and zero, and computes the offset to the
998 first entry. */
1013 /* Like GOT_TLSLD16, but no overflow. */
1028 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */
1043 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */
1058 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes
1059 the offset to the entry. */
1074 /* Like GOT_DTPREL16, but no overflow. */
1089 /* Like GOT_DTPREL16_LO, but next higher group of 16 bits. */
1104 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */
1119 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the
1120 offset to the entry. */
1135 /* Like GOT_TPREL16, but no overflow. */
1150 /* Like GOT_TPREL16_LO, but next higher group of 16 bits. */
1165 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */
1180 /* The remaining relocs are from the Embedded ELF ABI, and are not
1181 in the SVR4 ELF ABI. */
1183 /* 32 bit value resulting from the addend minus the symbol. */
1198 /* 16 bit value resulting from the addend minus the symbol. */
1213 /* 16 bit value resulting from the addend minus the symbol. */
1228 /* The high order 16 bits of the addend minus the symbol. */
1243 /* The high order 16 bits of the result of the addend minus the address,
1244 plus 1 if the contents of the low 16 bits, treated as a signed number,
1245 is negative. */
1260 /* 16 bit value resulting from allocating a 4 byte word to hold an
1261 address in the .sdata section, and returning the offset from
1262 _SDA_BASE_ for that relocation. */
1277 /* 16 bit value resulting from allocating a 4 byte word to hold an
1278 address in the .sdata2 section, and returning the offset from
1279 _SDA2_BASE_ for that relocation. */
1294 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
1295 small data items. */
1310 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
1311 signed offset from the appropriate base, and filling in the register
1312 field with the appropriate register (0, 2, or 13). */
1327 /* Relocation not handled: R_PPC_EMB_MRKREF */
1328 /* Relocation not handled: R_PPC_EMB_RELSEC16 */
1329 /* Relocation not handled: R_PPC_EMB_RELST_LO */
1330 /* Relocation not handled: R_PPC_EMB_RELST_HI */
1331 /* Relocation not handled: R_PPC_EMB_RELST_HA */
1332 /* Relocation not handled: R_PPC_EMB_BIT_FLD */
1334 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
1335 in the 16 bit signed offset from the appropriate base, and filling in the
1336 register field with the appropriate register (0, 2, or 13). */
1351 /* A 16 bit relative relocation. */
1366 /* A 16 bit relative relocation without overflow. */
1381 /* The high order 16 bits of a relative address. */
1396 /* The high order 16 bits of a relative address, plus 1 if the contents of
1397 the low 16 bits, treated as a signed number, is negative. */
1412 /* GNU extension to record C++ vtable hierarchy. */
1427 /* GNU extension to record C++ vtable member usage. */
1442 /* Phony reloc to handle AIX style TOC entries. */
1456 };
1457 \f
1458 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
1460 static void
1462 {
1467 i++)
1468 {
1474 }
1475 }
1479 bfd_reloc_code_real_type code)
1480 {
1483 /* Initialize howto table if not already done. */
1488 {
1577 }
1580 };
1585 {
1590 i++)
1596 }
1598 /* Set the howto pointer for a PowerPC ELF reloc. */
1600 static void
1604 {
1605 /* Initialize howto table if not already done. */
1612 /* Just because the above assert didn't trigger doesn't mean that
1613 ELF32_R_TYPE (dst->r_info) is necessarily a valid relocation. */
1615 {
1621 }
1622 }
1624 /* Handle the R_PPC_ADDR16_HA and R_PPC_REL16_HA relocs. */
1626 static bfd_reloc_status_type
1634 {
1635 bfd_vma relocation;
1638 {
1641 }
1648 else
1660 }
1662 static bfd_reloc_status_type
1670 {
1671 /* If this is a relocatable link (output_bfd test tells us), just
1672 call the generic function. Any adjustment will be done at final
1673 link time. */
1679 {
1684 }
1686 }
1687 \f
1688 /* Sections created by the linker. */
1691 {
1692 /* Pointer to the bfd section. */
1694 /* Section name. */
1696 /* Associated bss section name. */
1698 /* Associated symbol name. */
1700 /* Associated symbol. */
1704 /* Linked list of allocated pointer entries. This hangs off of the
1705 symbol lists, and provides allows us to return different pointers,
1706 based on different addend's. */
1709 {
1710 /* next allocated pointer for this symbol */
1712 /* offset of pointer from beginning of section */
1713 bfd_vma offset;
1714 /* addend used */
1715 bfd_vma addend;
1716 /* which linker section this is */
1720 struct ppc_elf_obj_tdata
1721 {
1724 /* A mapping from local symbols to offsets into the various linker
1725 sections added. This is index by the symbol index. */
1728 /* Flags used to auto-detect plt type. */
1731 };
1733 #define ppc_elf_tdata(bfd) \
1734 ((struct ppc_elf_obj_tdata *) (bfd)->tdata.any)
1736 #define elf_local_ptr_offsets(bfd) \
1737 (ppc_elf_tdata (bfd)->linker_section_pointers)
1739 /* Override the generic function because we store some extras. */
1741 static bfd_boolean
1743 {
1745 {
1750 }
1752 }
1754 /* Fix bad default arch selected for a 32 bit input bfd when the
1755 default is 64 bit. */
1757 static bfd_boolean
1759 {
1761 {
1765 {
1766 /* Relies on arch after 64 bit default being 32 bit default. */
1769 }
1770 }
1772 }
1774 /* Function to set whether a module needs the -mrelocatable bit set. */
1776 static bfd_boolean
1778 {
1785 }
1787 /* Support for core dump NOTE sections. */
1789 static bfd_boolean
1791 {
1796 {
1801 /* pr_cursig */
1804 /* pr_pid */
1807 /* pr_reg */
1812 }
1814 /* Make a ".reg/999" section. */
1817 }
1819 static bfd_boolean
1821 {
1823 {
1832 }
1834 /* Note that for some reason, a spurious space is tacked
1835 onto the end of the args in some (at least one anyway)
1836 implementations, so strip it off if it exists. */
1838 {
1844 }
1847 }
1851 {
1853 {
1858 {
1869 }
1872 {
1891 }
1892 }
1893 }
1895 /* Return address for Ith PLT stub in section PLT, for relocation REL
1896 or (bfd_vma) -1 if it should not be included. */
1898 static bfd_vma
1902 {
1904 }
1906 /* Handle a PowerPC specific section when reading an object file. This
1907 is called when bfd_section_from_shdr finds a section with an unknown
1908 type. */
1910 static bfd_boolean
1915 {
1917 flagword flags;
1932 }
1934 /* Set up any other section flags and such that may be necessary. */
1936 static bfd_boolean
1940 {
1948 }
1950 /* If we have .sbss2 or .PPC.EMB.sbss0 output sections, we
1951 need to bump up the number of section headers. */
1953 static int
1956 {
1969 }
1971 /* Add extra PPC sections -- Note, for now, make .sbss2 and
1972 .PPC.EMB.sbss0 a normal section, and not a bss section so
1973 that the linker doesn't crater when trying to make more than
1974 2 sections. */
1977 {
1988 };
1990 /* This is what we want for new plt/got. */
1996 {
1999 /* See if this is one of the special sections. */
2006 {
2010 }
2013 }
2014 \f
2015 /* Very simple linked list structure for recording apuinfo values. */
2017 {
2020 }
2021 apuinfo_list;
2026 static void
2028 {
2030 }
2032 static void
2034 {
2038 {
2042 }
2051 }
2053 static unsigned
2055 {
2060 entry;
2065 }
2069 {
2075 ;
2078 }
2080 static void
2082 {
2086 {
2090 }
2093 }
2098 /* Scan the input BFDs and create a linked list of
2099 the APUinfo values that will need to be emitted. */
2101 static void
2103 {
2108 bfd_size_type output_section_size;
2118 /* Scan the input bfds, looking for apuinfo sections. */
2123 {
2126 {
2129 }
2130 }
2132 /* We need at least one input sections
2133 in order to make merging worthwhile. */
2137 /* Just make sure that the output section exists as well. */
2142 /* Allocate a buffer for the contents of the input sections. */
2150 /* Read in the input sections contents. */
2152 {
2162 {
2165 }
2169 {
2172 }
2174 /* Process the contents of the section. */
2178 /* Verify the contents of the header. Note - we have to
2179 extract the values this way in order to allow for a
2180 host whose endian-ness is different from the target. */
2192 /* Get the number of bytes used for apuinfo entries. */
2197 /* Make sure that we do not run off the end of the section. */
2201 /* Scan the apuinfo section, building a list of apuinfo numbers. */
2205 /* Update the offset. */
2207 }
2211 /* Compute the size of the output section. */
2221 fail:
2226 }
2228 /* Prevent the output section from accumulating the input sections'
2229 contents. We have already stored this in our linked list structure. */
2231 static bfd_boolean
2236 {
2239 }
2241 /* Finally we can generate the output section. */
2243 static void
2245 {
2250 bfd_size_type length;
2265 {
2269 }
2271 /* Create the apuinfo header. */
2280 {
2283 }
2294 }
2295 \f
2296 /* The following functions are specific to the ELF linker, while
2297 functions above are used generally. They appear in this file more
2298 or less in the order in which they are called. eg.
2299 ppc_elf_check_relocs is called early in the link process,
2300 ppc_elf_finish_dynamic_sections is one of the last functions
2301 called. */
2303 /* The PPC linker needs to keep track of the number of relocs that it
2304 decides to copy as dynamic relocs in check_relocs for each symbol.
2305 This is so that it can later discard them if they are found to be
2306 unnecessary. We store the information in a field extending the
2307 regular ELF linker hash table. */
2309 struct ppc_elf_dyn_relocs
2310 {
2313 /* The input section of the reloc. */
2316 /* Total number of relocs copied for the input section. */
2317 bfd_size_type count;
2319 /* Number of pc-relative relocs copied for the input section. */
2320 bfd_size_type pc_count;
2321 };
2323 /* Track PLT entries needed for a given symbol. We might need more
2324 than one glink entry per symbol. */
2325 struct plt_entry
2326 {
2329 /* -fPIC uses multiple GOT sections, one per file, called ".got2".
2330 This field stores the offset into .got2 used to initialise the
2331 GOT pointer reg. It will always be at least 32768 (and for
2332 current gcc this is the only offset used). */
2333 bfd_vma addend;
2335 /* The .got2 section. */
2338 /* PLT refcount or offset. */
2339 union
2340 {
2341 bfd_signed_vma refcount;
2342 bfd_vma offset;
2345 /* .glink stub offset. */
2346 bfd_vma glink_offset;
2347 };
2349 /* Of those relocs that might be copied as dynamic relocs, this macro
2350 selects those that must be copied when linking a shared library,
2351 even when the symbol is local. */
2353 #define MUST_BE_DYN_RELOC(RTYPE) \
2354 ((RTYPE) != R_PPC_REL24 \
2355 && (RTYPE) != R_PPC_REL14 \
2356 && (RTYPE) != R_PPC_REL14_BRTAKEN \
2357 && (RTYPE) != R_PPC_REL14_BRNTAKEN \
2358 && (RTYPE) != R_PPC_REL32)
2360 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
2361 copying dynamic variables from a shared lib into an app's dynbss
2362 section, and instead use a dynamic relocation to point into the
2363 shared lib. */
2364 #define ELIMINATE_COPY_RELOCS 1
2366 /* PPC ELF linker hash entry. */
2368 struct ppc_elf_link_hash_entry
2369 {
2372 /* If this symbol is used in the linker created sections, the processor
2373 specific backend uses this field to map the field into the offset
2374 from the beginning of the section. */
2377 /* Track dynamic relocs copied for this symbol. */
2380 /* Contexts in which symbol is used in the GOT (or TOC).
2381 TLS_GD .. TLS_TLS bits are or'd into the mask as the
2382 corresponding relocs are encountered during check_relocs.
2383 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
2384 indicate the corresponding GOT entry type is not needed. */
2393 /* Nonzero if we have seen a small data relocation referring to this
2394 symbol. */
2396 };
2398 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent))
2400 /* PPC ELF linker hash table. */
2402 struct ppc_elf_link_hash_table
2403 {
2406 /* Short-cuts to get to dynamic linker sections. */
2419 /* The (unloaded but important) .rela.plt.unloaded on VxWorks. */
2422 /* The .got.plt section (VxWorks only)*/
2425 /* Shortcut to .__tls_get_addr. */
2428 /* The bfd that forced an old-style PLT. */
2431 /* TLS local dynamic got entry handling. */
2433 bfd_signed_vma refcount;
2434 bfd_vma offset;
2437 /* Offset of PltResolve function in glink. */
2438 bfd_vma glink_pltresolve;
2440 /* Size of reserved GOT entries. */
2442 /* Non-zero if allocating the header left a gap. */
2445 /* The type of PLT we have chosen to use. */
2448 /* Set if we should emit symbols for stubs. */
2451 /* True if the target system is VxWorks. */
2454 /* The size of PLT entries. */
2456 /* The distance between adjacent PLT slots. */
2458 /* The size of the first PLT entry. */
2461 /* Small local sym to section mapping cache. */
2463 };
2465 /* Get the PPC ELF linker hash table from a link_info structure. */
2467 #define ppc_elf_hash_table(p) \
2468 ((struct ppc_elf_link_hash_table *) (p)->hash)
2470 /* Create an entry in a PPC ELF linker hash table. */
2476 {
2477 /* Allocate the structure if it has not already been allocated by a
2478 subclass. */
2480 {
2485 }
2487 /* Call the allocation method of the superclass. */
2490 {
2494 }
2497 }
2499 /* Create a PPC ELF linker hash table. */
2503 {
2511 ppc_elf_link_hash_newfunc,
2513 {
2516 }
2536 }
2538 /* Create .got and the related sections. */
2540 static bfd_boolean
2542 {
2545 flagword flags;
2556 {
2560 }
2561 else
2562 {
2563 /* The powerpc .got has a blrl instruction in it. Mark it
2564 executable. */
2569 }
2579 }
2581 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2582 to output sections (just like _bfd_elf_create_dynamic_sections has
2583 to create .dynbss and .rela.bss). */
2585 static bfd_boolean
2587 {
2590 flagword flags;
2618 {
2625 }
2638 /* The VxWorks PLT is a loaded section with contents. */
2641 }
2643 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2645 static void
2649 {
2656 {
2658 {
2662 /* Add reloc counts against the indirect sym to the direct sym
2663 list. Merge any entries against the same section. */
2665 {
2670 {
2675 }
2678 }
2680 }
2684 }
2689 /* If called to transfer flags for a weakdef during processing
2690 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
2691 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
2702 /* If we were called to copy over info for a weak sym, that's all. */
2706 /* Copy over the GOT refcount entries that we may have already seen to
2707 the symbol which just became indirect. */
2711 /* And plt entries. */
2713 {
2715 {
2720 {
2725 {
2729 }
2732 }
2734 }
2738 }
2741 {
2749 }
2750 }
2752 /* Return 1 if target is one of ours. */
2754 static bfd_boolean
2756 {
2764 }
2766 /* Hook called by the linker routine which adds symbols from an object
2767 file. We use it to put .comm items in .sbss, and not .bss. */
2769 static bfd_boolean
2777 {
2782 {
2783 /* Common symbols less than or equal to -G nn bytes are automatically
2784 put into .sbss. */
2789 {
2797 flags);
2800 }
2804 }
2807 }
2808 \f
2809 static bfd_boolean
2812 {
2821 }
2823 /* Create a special linker section. */
2825 static bfd_boolean
2828 flagword flags,
2830 {
2837 /* Record the first bfd that needs the special sections. */
2843 flags);
2850 }
2852 /* Find a linker generated pointer with a given addend and type. */
2855 elf_find_pointer_linker_section
2857 bfd_vma addend,
2859 {
2865 }
2867 /* Allocate a pointer to live in a linker created section. */
2869 static bfd_boolean
2874 {
2878 bfd_size_type amt;
2882 /* Is this a global symbol? */
2884 {
2887 /* Has this symbol already been allocated? If so, our work is done. */
2891 lsect))
2895 }
2896 else
2897 {
2898 /* Allocation of a pointer to a local symbol. */
2901 /* Allocate a table to hold the local symbols if first time. */
2903 {
2914 }
2916 /* Has this symbol already been allocated? If so, our work is done. */
2919 lsect))
2923 }
2925 /* Allocate space for a pointer in the linker section, and allocate
2926 a new pointer record from internal memory. */
2942 #ifdef DEBUG
2947 #endif
2950 }
2952 static bfd_boolean
2957 {
2962 {
2970 }
2976 }
2978 static bfd_boolean
2981 {
2990 {
3000 }
3003 }
3007 {
3016 }
3018 static void
3020 {
3023 abfd,
3026 }
3028 /* Look through the relocs for a section during the first phase, and
3029 allocate space in the global offset table or procedure linkage
3030 table. */
3032 static bfd_boolean
3037 {
3048 /* Don't do anything special with non-loaded, non-alloced sections.
3049 In particular, any relocs in such sections should not affect GOT
3050 and PLT reference counting (ie. we don't allow them to create GOT
3051 or PLT entries), there's no possibility or desire to optimize TLS
3052 relocs, and there's not much point in propagating relocs to shared
3053 libs that the dynamic linker won't relocate. */
3057 #ifdef DEBUG
3060 #endif
3062 /* Initialize howto table if not already done. */
3074 {
3083 else
3084 {
3089 }
3091 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
3092 This shows up in particular in an R_PPC_ADDR32 in the eabi
3093 startup code. */
3097 {
3103 }
3107 {
3137 dogottls:
3139 /* Fall thru */
3141 /* GOT16 relocations */
3146 /* This symbol requires a global offset table entry. */
3148 {
3153 }
3155 {
3158 }
3159 else
3160 /* This is a global offset table entry for a local symbol. */
3165 /* Indirect .sdata relocation. */
3168 {
3171 }
3180 {
3183 }
3186 /* Indirect .sdata2 relocation. */
3189 {
3192 }
3201 {
3204 }
3209 {
3212 }
3217 {
3220 }
3225 {
3228 }
3233 {
3236 }
3242 {
3245 }
3253 {
3256 }
3265 {
3268 }
3279 #ifdef DEBUG
3281 #endif
3282 /* This symbol requires a procedure linkage table entry. We
3283 actually build the entry in finish_dynamic_symbol,
3284 because this might be a case of linking PIC code without
3285 linking in any dynamic objects, in which case we don't
3286 need to generate a procedure linkage table after all. */
3289 {
3290 /* It does not make sense to have a procedure linkage
3291 table entry for a local symbol. */
3294 abfd,
3295 sec,
3300 }
3301 else
3302 {
3306 {
3309 }
3313 }
3316 /* The following relocations don't need to propagate the
3317 relocation if linking a shared object since they are
3318 section relative. */
3337 /* These are just markers. */
3344 /* These should only appear in dynamic objects. */
3351 /* These aren't handled yet. We'll report an error later. */
3360 /* This refers only to functions defined in the shared library. */
3363 {
3366 }
3369 /* This relocation describes the C++ object vtable hierarchy.
3370 Reconstruct it for later use during GC. */
3376 /* This relocation describes which C++ vtable entries are actually
3377 used. Record for later use during GC. */
3385 /* We shouldn't really be seeing these. */
3391 /* Nor these. */
3410 {
3411 /* Old -fPIC gcc code has .long LCTOC1-LCFx just before
3412 the start of a function, which assembles to a REL32
3413 reference to .got2. If we detect one of these, then
3414 force the old PLT layout because the linker cannot
3415 reliably deduce the GOT pointer value needed for
3416 PLT call stubs. */
3420 r_symndx);
3422 {
3425 }
3426 }
3438 {
3440 {
3443 }
3445 }
3446 /* fall through */
3459 dodyn1:
3461 {
3462 /* We may need a plt entry if the symbol turns out to be
3463 a function defined in a dynamic object. */
3467 /* We may need a copy reloc too. */
3469 }
3471 dodyn:
3472 /* If we are creating a shared library, and this is a reloc
3473 against a global symbol, or a non PC relative reloc
3474 against a local symbol, then we need to copy the reloc
3475 into the shared library. However, if we are linking with
3476 -Bsymbolic, we do not need to copy a reloc against a
3477 global symbol which is defined in an object we are
3478 including in the link (i.e., DEF_REGULAR is set). At
3479 this point we have not seen all the input files, so it is
3480 possible that DEF_REGULAR is not set now but will be set
3481 later (it is never cleared). In case of a weak definition,
3482 DEF_REGULAR may be cleared later by a strong definition in
3483 a shared library. We account for that possibility below by
3484 storing information in the dyn_relocs field of the hash
3485 table entry. A similar situation occurs when creating
3486 shared libraries and symbol visibility changes render the
3487 symbol local.
3489 If on the other hand, we are creating an executable, we
3490 may need to keep relocations for symbols satisfied by a
3491 dynamic library if we manage to avoid copy relocs for the
3492 symbol. */
3499 || (ELIMINATE_COPY_RELOCS
3504 {
3508 #ifdef DEBUG
3510 "ppc_elf_check_relocs needs to "
3514 #endif
3516 {
3519 name = (bfd_elf_string_from_elf_section
3534 {
3535 flagword flags;
3541 name,
3542 flags);
3547 }
3549 }
3551 /* If this is a global symbol, we count the number of
3552 relocations we need for this symbol. */
3554 {
3556 }
3557 else
3558 {
3559 /* Track dynamic relocs needed for local syms too.
3560 We really need local syms available to do this
3561 easily. Oh well. */
3573 }
3577 {
3586 }
3591 }
3594 }
3595 }
3598 }
3599 \f
3601 /* Merge object attributes from IBFD into OBFD. Raise an error if
3602 there are conflicting attributes. */
3603 static bfd_boolean
3605 {
3610 {
3611 /* This is the first object. Copy the attributes. */
3614 /* Use the Tag_null value to indicate the attributes have been
3615 initialized. */
3619 }
3621 /* Check for conflicting Tag_GNU_Power_ABI_FP attributes and merge
3622 non-conflicting ones. */
3626 {
3631 ;
3634 _bfd_error_handler
3638 _bfd_error_handler
3641 _bfd_error_handler
3644 else
3645 _bfd_error_handler
3648 }
3650 /* Merge Tag_compatibility attributes and any common GNU ones. */
3654 }
3656 /* Merge backend specific data from an object file to the output
3657 object file when linking. */
3659 static bfd_boolean
3661 {
3662 flagword old_flags;
3663 flagword new_flags;
3664 bfd_boolean error;
3670 /* Check if we have the same endianess. */
3680 {
3681 /* First call, no flags set. */
3684 }
3686 /* Compatible flags are ok. */
3688 ;
3690 /* Incompatible flags. */
3691 else
3692 {
3693 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
3694 to be linked with either. */
3698 {
3703 }
3706 {
3711 }
3713 /* The output is -mrelocatable-lib iff both the input files are. */
3717 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
3718 but each input file is either -mrelocatable or -mrelocatable-lib. */
3724 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
3725 any module uses it. */
3731 /* Warn about any other mismatches. */
3733 {
3739 }
3742 {
3745 }
3746 }
3749 }
3750 \f
3751 /* Choose which PLT scheme to use, and set .plt flags appropriately.
3752 Returns -1 on error, 0 for old PLT, 1 for new PLT. */
3753 int
3758 {
3760 flagword flags;
3765 {
3768 else
3769 {
3773 /* Look through the reloc flags left by ppc_elf_check_relocs.
3774 Use the old style bss plt if a file makes plt calls
3775 without using the new relocs, and if ld isn't given
3776 --secure-plt and we never see REL16 relocs. */
3781 {
3785 {
3789 }
3790 }
3792 }
3793 }
3802 {
3806 /* The new PLT is a loaded section. */
3811 /* The new GOT is not executable. */
3815 }
3816 else
3817 {
3818 /* Stop an unused .glink section from affecting .text alignment. */
3822 }
3824 }
3825 \f
3826 /* Return the section that should be marked against GC for a given
3827 relocation. */
3835 {
3838 {
3842 }
3845 }
3847 /* Update the got, plt and dynamic reloc reference counts for the
3848 section being removed. */
3850 static bfd_boolean
3855 {
3876 {
3883 {
3895 {
3896 /* Everything must go for SEC. */
3899 }
3900 }
3904 {
3910 /* Fall thru */
3929 {
3932 }
3934 {
3937 }
3947 /* Fall thru */
3970 {
3975 }
3980 }
3981 }
3983 }
3984 \f
3985 /* Set htab->tls_get_addr and call the generic ELF tls_setup function. */
3987 asection *
3989 {
3996 {
3999 }
4004 }
4006 /* Run through all the TLS relocs looking for optimization
4007 opportunities. */
4009 bfd_boolean
4012 {
4022 {
4028 {
4032 /* Read the relocations. */
4041 {
4047 bfd_boolean is_local;
4051 {
4059 }
4068 {
4073 /* These relocs should never be against a symbol
4074 defined in a shared lib. Leave them alone if
4075 that turns out to be the case. */
4081 /* LD -> LE */
4092 /* GD -> LE */
4094 else
4095 /* GD -> IE */
4107 {
4108 /* IE -> LE */
4112 }
4113 else
4123 {
4127 }
4134 }
4137 {
4139 {
4140 /* We managed to get rid of a got entry. */
4143 }
4145 }
4146 else
4147 {
4153 {
4160 {
4164 }
4165 }
4171 {
4172 /* We managed to get rid of a got entry. */
4175 }
4178 }
4182 }
4186 }
4190 {
4193 else
4195 }
4196 }
4198 }
4199 \f
4200 /* Adjust a symbol defined by a dynamic object and referenced by a
4201 regular object. The current definition is in some section of the
4202 dynamic object, but we're not including those sections. We have to
4203 change the definition to something the rest of the link can
4204 understand. */
4206 static bfd_boolean
4209 {
4213 #ifdef DEBUG
4216 #endif
4218 /* Make sure we know what is going on here. */
4227 /* Deal with function syms. */
4230 {
4231 /* Clear procedure linkage table information for any symbol that
4232 won't need a .plt entry. */
4241 {
4242 /* A PLT entry is not required/allowed when:
4244 1. We are not using ld.so; because then the PLT entry
4245 can't be set up, so we can't use one. In this case,
4246 ppc_elf_adjust_dynamic_symbol won't even be called.
4248 2. GC has rendered the entry unused.
4250 3. We know for certain that a call to this symbol
4251 will go to this object, or will remain undefined. */
4254 }
4256 }
4257 else
4260 /* If this is a weak symbol, and there is a real definition, the
4261 processor independent code will have arranged for us to see the
4262 real definition first, and we can just use the same value. */
4264 {
4272 }
4274 /* This is a reference to a symbol defined by a dynamic object which
4275 is not a function. */
4277 /* If we are creating a shared library, we must presume that the
4278 only references to the symbol are via the global offset table.
4279 For such cases we need not do anything here; the relocations will
4280 be handled correctly by relocate_section. */
4284 /* If there are no references to this symbol that do not use the
4285 GOT, we don't need to generate a copy reloc. */
4289 /* If we didn't find any dynamic relocs in read-only sections, then
4290 we'll be keeping the dynamic relocs and avoiding the copy reloc.
4291 We can't do this if there are any small data relocations. This
4292 doesn't work on VxWorks, where we can not have dynamic
4293 relocations (other than copy and jump slot relocations) in an
4294 executable. */
4298 {
4301 {
4305 }
4308 {
4311 }
4312 }
4315 {
4319 }
4321 /* We must allocate the symbol in our .dynbss section, which will
4322 become part of the .bss section of the executable. There will be
4323 an entry for this symbol in the .dynsym section. The dynamic
4324 object will contain position independent code, so all references
4325 from the dynamic object to this symbol will go through the global
4326 offset table. The dynamic linker will use the .dynsym entry to
4327 determine the address it must put in the global offset table, so
4328 both the dynamic object and the regular object will refer to the
4329 same memory location for the variable.
4331 Of course, if the symbol is referenced using SDAREL relocs, we
4332 must instead allocate it in .sbss. */
4336 else
4340 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
4341 copy the initial value out of the dynamic object and into the
4342 runtime process image. We need to remember the offset into the
4343 .rela.bss section we are going to use. */
4345 {
4350 else
4355 }
4358 }
4359 \f
4360 /* Generate a symbol to mark plt call stubs. For non-PIC code the sym is
4361 xxxxxxxx.plt_call32.<callee> where xxxxxxxx is a hex number, usually 0,
4362 specifying the addend on the plt relocation. For -fpic code, the sym
4363 is xxxxxxxx.plt_pic32.<callee>, and for -fPIC
4364 xxxxxxxx.got2.plt_pic32.<callee>. */
4366 static bfd_boolean
4370 {
4379 else
4399 {
4408 }
4410 }
4412 /* Allocate NEED contiguous space in .got, and return the offset.
4413 Handles allocation of the got header when crossing 32k. */
4415 static bfd_vma
4417 {
4418 bfd_vma where;
4422 {
4425 }
4426 else
4427 {
4430 {
4433 }
4434 else
4435 {
4438 {
4441 }
4444 }
4445 }
4447 }
4449 /* Allocate space in associated reloc sections for dynamic relocs. */
4451 static bfd_boolean
4453 {
4463 /* When warning symbols are created, they **replace** the "real"
4464 entry in the hash table, thus we never get to see the real
4465 symbol in a hash traversal. So look at it now. */
4470 {
4477 {
4478 /* Make sure this symbol is output as a dynamic symbol. */
4481 {
4484 }
4488 {
4492 {
4494 {
4497 }
4502 {
4505 }
4509 {
4512 }
4518 }
4519 else
4520 {
4522 {
4523 /* If this is the first .plt entry, make room
4524 for the special first entry. */
4528 /* The PowerPC PLT is actually composed of two
4529 parts, the first part is 2 words (for a load
4530 and a jump), and then there is a remaining
4531 word available at the end. */
4538 /* If this symbol is not defined in a regular
4539 file, and we are not generating a shared
4540 library, then set the symbol to this location
4541 in the .plt. This is required to make
4542 function pointers compare as equal between
4543 the normal executable and the shared library. */
4546 {
4549 }
4551 /* Make room for this entry. */
4553 /* After the 8192nd entry, room for two entries
4554 is allocated. */
4560 }
4562 }
4564 /* We also need to make an entry in the .rela.plt section. */
4566 {
4570 {
4571 /* Allocate space for the unloaded relocations. */
4573 {
4576 {
4580 }
4585 }
4587 /* Every PLT entry has an associated GOT entry in
4588 .got.plt. */
4590 }
4592 }
4593 }
4594 else
4596 }
4597 else
4601 {
4604 }
4605 }
4606 else
4607 {
4610 }
4614 {
4615 /* Make sure this symbol is output as a dynamic symbol. */
4618 {
4621 }
4625 /* If just an LD reloc, we'll just use htab->tlsld_got.offset. */
4627 else
4628 {
4629 bfd_boolean dyn;
4632 {
4641 }
4642 else
4650 {
4651 /* All the entries we allocated need relocs.
4652 Except LD only needs one. */
4656 }
4657 }
4658 }
4659 else
4665 /* In the shared -Bsymbolic case, discard space allocated for
4666 dynamic pc-relative relocs against symbols which turn out to be
4667 defined in regular objects. For the normal shared case, discard
4668 space for relocs that have become local due to symbol visibility
4669 changes. */
4672 {
4673 /* Relocs that use pc_count are those that appear on a call insn,
4674 or certain REL relocs (see MUST_BE_DYN_RELOC) that can be
4675 generated via assembly. We want calls to protected symbols to
4676 resolve directly to the function rather than going via the plt.
4677 If people want function pointer comparisons to work as expected
4678 then they should avoid writing weird assembly. */
4680 {
4684 {
4689 else
4691 }
4692 }
4694 /* Also discard relocs on undefined weak syms with non-default
4695 visibility. */
4698 {
4702 /* Make sure undefined weak symbols are output as a dynamic
4703 symbol in PIEs. */
4706 {
4709 }
4710 }
4711 }
4713 {
4714 /* For the non-shared case, discard space for relocs against
4715 symbols which turn out to need copy relocs or are not
4716 dynamic. */
4721 {
4722 /* Make sure this symbol is output as a dynamic symbol.
4723 Undefined weak syms won't yet be marked as dynamic. */
4726 {
4729 }
4731 /* If that succeeded, we know we'll be keeping all the
4732 relocs. */
4735 }
4739 keep: ;
4740 }
4742 /* Finally, allocate space. */
4744 {
4747 }
4750 }
4752 /* Find any dynamic relocs that apply to read-only sections. */
4754 static bfd_boolean
4756 {
4766 {
4772 {
4775 /* Not an error, just cut short the traversal. */
4777 }
4778 }
4780 }
4782 /* Set the sizes of the dynamic sections. */
4784 static bfd_boolean
4787 {
4790 bfd_boolean relocs;
4793 #ifdef DEBUG
4795 #endif
4801 {
4802 /* Set the contents of the .interp section to the interpreter. */
4804 {
4809 }
4810 }
4817 /* Set up .got offsets for local syms, and space for local dynamic
4818 relocs. */
4820 {
4824 bfd_size_type locsymcount;
4831 {
4838 {
4841 {
4842 /* Input section has been discarded, either because
4843 it is a copy of a linkonce section or due to
4844 linker script /DISCARD/, so we'll be discarding
4845 the relocs too. */
4846 }
4848 {
4855 }
4856 }
4857 }
4869 {
4871 {
4872 /* If just an LD reloc, we'll just use
4873 htab->tlsld_got.offset. */
4876 }
4877 else
4878 {
4881 {
4888 }
4889 else
4895 }
4896 }
4897 else
4899 }
4902 {
4906 }
4907 else
4910 /* Allocate space for global sym dynamic relocs. */
4914 {
4917 /* If we haven't allocated the header, do so now. When we get here,
4918 for old plt/got the got size will be 0 to 32764 (not allocated),
4919 or 32780 to 65536 (header allocated). For new plt/got, the
4920 corresponding ranges are 0 to 32768 and 32780 to 65536. */
4922 {
4927 }
4930 }
4933 {
4935 /* Space for the branch table. */
4937 /* Pad out to align the start of PLTresolve. */
4942 {
4949 {
4958 }
4964 {
4973 }
4974 }
4975 }
4977 /* We've now determined the sizes of the various dynamic sections.
4978 Allocate memory for them. */
4981 {
4994 {
4995 /* We'd like to strip these sections if they aren't needed, but if
4996 we've exported dynamic symbols from them we must leave them.
4997 It's too late to tell BFD to get rid of the symbols. */
5000 /* Strip this section if we don't need it; see the
5001 comment below. */
5002 }
5005 {
5006 /* Strip these too. */
5007 }
5009 {
5011 {
5012 /* Remember whether there are any relocation sections. */
5015 /* We use the reloc_count field as a counter if we need
5016 to copy relocs into the output file. */
5018 }
5019 }
5020 else
5021 {
5022 /* It's not one of our sections, so don't allocate space. */
5024 }
5027 {
5028 /* If we don't need this section, strip it from the
5029 output file. This is mostly to handle .rela.bss and
5030 .rela.plt. We must create both sections in
5031 create_dynamic_sections, because they must be created
5032 before the linker maps input sections to output
5033 sections. The linker does that before
5034 adjust_dynamic_symbol is called, and it is that
5035 function which decides whether anything needs to go
5036 into these sections. */
5039 }
5044 /* Allocate memory for the section contents. */
5048 }
5051 {
5052 /* Add some entries to the .dynamic section. We fill in the
5053 values later, in ppc_elf_finish_dynamic_sections, but we
5054 must add the entries now so that we get the correct size for
5055 the .dynamic section. The DT_DEBUG entry is filled in by the
5056 dynamic linker and used by the debugger. */
5057 #define add_dynamic_entry(TAG, VAL) \
5058 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
5061 {
5064 }
5067 {
5073 }
5076 {
5079 }
5082 {
5087 }
5089 /* If any dynamic relocs apply to a read-only section, then we
5090 need a DT_TEXTREL entry. */
5093 info);
5096 {
5099 }
5100 }
5101 #undef add_dynamic_entry
5104 }
5105 \f
5106 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
5109 {
5118 };
5121 {
5126 };
5128 static bfd_boolean
5133 {
5134 struct one_fixup
5135 {
5138 bfd_vma toff;
5139 bfd_vma trampoff;
5140 };
5148 bfd_boolean changed;
5150 bfd_size_type trampoff;
5155 /* Nothing to do if there are no relocations, and no need to do
5156 anything with non-alloc sections. */
5163 /* Space for a branch around any trampolines. */
5168 /* Get a copy of the native relocations. */
5179 {
5191 {
5206 }
5208 /* Get the value of the symbol referred to by the reloc. */
5210 {
5211 /* A local symbol. */
5214 /* Read this BFD's local symbols. */
5216 {
5224 }
5232 else
5237 }
5238 else
5239 {
5240 /* Global symbol handling. */
5255 {
5259 {
5261 {
5264 }
5265 else
5266 {
5269 }
5270 }
5271 }
5273 ;
5276 {
5279 }
5280 else
5284 }
5286 /* If the branch and target are in the same section, you have
5287 no hope of adding stubs. We'll error out later should the
5288 branch overflow. */
5292 /* There probably isn't any reason to handle symbols in
5293 SEC_MERGE sections; SEC_MERGE doesn't seem a likely
5294 attribute for a code section, and we are only looking at
5295 branches. However, implement it correctly here as a
5296 reference for other target relax_section functions. */
5298 {
5299 /* At this stage in linking, no SEC_MERGE symbol has been
5300 adjusted, so all references to such symbols need to be
5301 passed through _bfd_merged_section_offset. (Later, in
5302 relocate_section, all SEC_MERGE symbols *except* for
5303 section symbols have been adjusted.)
5305 gas may reduce relocations against symbols in SEC_MERGE
5306 sections to a relocation against the section symbol when
5307 the original addend was zero. When the reloc is against
5308 a section symbol we should include the addend in the
5309 offset passed to _bfd_merged_section_offset, since the
5310 location of interest is the original symbol. On the
5311 other hand, an access to "sym+addend" where "sym" is not
5312 a section symbol should not include the addend; Such an
5313 access is presumed to be an offset from "sym"; The
5314 location of interest is just "sym". */
5320 toff);
5324 }
5325 /* PLTREL24 addends are special. */
5329 /* Attempted -shared link of non-pic code loses. */
5338 /* If the branch is in range, no need to do anything. */
5342 /* Look for an existing fixup to this address. */
5348 {
5354 /* Oh dear, we can't reach a trampoline. Don't try to add
5355 one. We'll report an error later. */
5359 {
5363 }
5364 else
5365 {
5369 }
5378 /* Hijack the old relocation. Since we need two
5379 relocations for this use a "composite" reloc. */
5381 stub_rtype);
5384 /* Record the fixup so we don't do it again this section. */
5393 }
5394 else
5395 {
5400 /* Nop out the reloc, since we're finalizing things here. */
5402 }
5404 /* Get the section contents. */
5406 {
5407 /* Get cached copy if it exists. */
5410 else
5411 {
5412 /* Go get them off disk. */
5415 }
5416 }
5418 /* Fix up the existing branch to hit the trampoline. */
5421 {
5439 }
5440 }
5442 /* Write out the trampolines. */
5445 {
5448 bfd_vma val;
5451 do
5452 {
5456 }
5464 /* Branch around the trampolines. */
5472 {
5475 }
5476 else
5477 {
5480 }
5484 {
5486 i++;
5490 }
5492 }
5496 {
5499 else
5500 {
5501 /* Cache the symbols for elf_link_input_bfd. */
5503 }
5504 }
5508 {
5511 else
5512 {
5513 /* Cache the section contents for elf_link_input_bfd. */
5515 }
5516 }
5519 {
5522 else
5524 }
5529 error_return:
5539 }
5540 \f
5541 /* What to do when ld finds relocations against symbols defined in
5542 discarded sections. */
5544 static unsigned int
5546 {
5554 }
5555 \f
5556 /* Fill in the address for a pointer generated in a linker section. */
5558 static bfd_vma
5562 bfd_vma relocation,
5564 {
5570 {
5571 /* Handle global symbol. */
5577 }
5578 else
5579 {
5580 /* Handle local symbol. */
5585 }
5589 lsect);
5592 /* Offset will always be a multiple of four, so use the bottom bit
5593 as a "written" flag. */
5595 {
5600 }
5606 #ifdef DEBUG
5610 #endif
5612 /* Subtract out the addend, because it will get added back in by the normal
5613 processing. */
5615 }
5617 /* The RELOCATE_SECTION function is called by the ELF backend linker
5618 to handle the relocations for a section.
5620 The relocs are always passed as Rela structures; if the section
5621 actually uses Rel structures, the r_addend field will always be
5622 zero.
5624 This function is responsible for adjust the section contents as
5625 necessary, and (if using Rela relocs and generating a
5626 relocatable output file) adjusting the reloc addend as
5627 necessary.
5629 This function does not have to worry about setting the reloc
5630 address or the reloc symbol index.
5632 LOCAL_SYMS is a pointer to the swapped in local symbols.
5634 LOCAL_SECTIONS is an array giving the section in the input file
5635 corresponding to the st_shndx field of each local symbol.
5637 The global hash table entry for the global symbols can be found
5638 via elf_sym_hashes (input_bfd).
5640 When generating relocatable output, this function must handle
5641 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
5642 going to be the section symbol corresponding to the output
5643 section, which means that the addend must be adjusted
5644 accordingly. */
5646 static bfd_boolean
5655 {
5661 Elf_Internal_Rela outrel;
5668 #ifdef DEBUG
5674 #endif
5678 /* Initialize howto table if not already done. */
5689 {
5691 bfd_vma addend;
5692 bfd_reloc_status_type r;
5699 bfd_vma relocation;
5701 bfd_boolean unresolved_reloc;
5702 bfd_boolean warned;
5714 {
5720 }
5721 else
5722 {
5729 }
5732 {
5733 /* For relocs against symbols from removed linkonce sections,
5734 or sections discarded by a linker script, we just want the
5735 section contents zeroed. Avoid any special processing. */
5743 }
5746 {
5750 {
5751 /* R_PPC_PLTREL24 is rather special. If non-zero, the
5752 addend specifies the GOT pointer offset within .got2. */
5754 }
5756 }
5758 /* TLS optimizations. Replace instruction sequences and relocs
5759 based on information we collected in tls_optimize. We edit
5760 RELOCS so that --emit-relocs will output something sensible
5761 for the final instruction stream. */
5765 {
5769 {
5773 }
5774 }
5776 /* Ensure reloc mapping code below stays sane. */
5787 {
5795 {
5796 bfd_vma insn;
5803 }
5809 {
5818 else
5821 /* add -> addi. */
5827 /* load and store indexed -> dform. */
5831 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
5836 /* lwax -> lwa. */
5838 else
5845 /* Was PPC_TLS which sits on insn boundary, now
5846 PPC_TPREL16_LO which is at low-order half-word. */
5848 }
5861 {
5862 tls_gdld_hi:
5866 else
5867 {
5871 }
5873 }
5886 {
5887 tls_get_addr_check:
5889 {
5894 bfd_vma offset;
5896 /* The next instruction should be a call to
5897 __tls_get_addr. Peek at the reloc to be sure. */
5915 /* OK, it checks out. Replace the call. */
5920 {
5921 /* IE */
5930 }
5931 else
5932 {
5933 /* LE */
5937 {
5938 /* Was an LD reloc. */
5941 }
5945 R_PPC_TPREL16_LO);
5948 }
5952 {
5953 /* We changed the symbol on an LD reloc. Start over
5954 in order to get h, sym, sec etc. right. */
5955 rel--;
5957 }
5958 }
5959 }
5961 }
5963 /* Handle other relocations that tweak non-addend part of insn. */
5966 {
5970 /* Branch taken prediction relocations. */
5974 /* Fall thru */
5976 /* Branch not taken prediction relocations. */
5987 /* Invert 'y' bit if not the default. */
5993 }
6001 {
6018 /* GOT16 relocations. Like an ADDR16 using the symbol's
6019 address in the GOT as relocation value instead of the
6020 symbol's value itself. Also, create a GOT entry for the
6021 symbol and put the symbol value there. */
6054 dogot:
6055 {
6056 /* Relocation is to the entry for this symbol in the global
6057 offset table. */
6058 bfd_vma off;
6071 {
6072 bfd_boolean dyn;
6077 /* This is actually a static link, or it is a
6078 -Bsymbolic link and the symbol is defined
6079 locally, or the symbol was forced to be local
6080 because of a version file. */
6081 ;
6082 else
6083 {
6086 }
6088 }
6089 else
6090 {
6094 }
6096 /* The offset must always be a multiple of 4. We use the
6097 least significant bit to record whether we have already
6098 processed this entry. */
6102 else
6103 {
6114 /* We might have multiple got entries for this sym.
6115 Initialize them all. */
6116 do
6117 {
6121 {
6124 }
6126 {
6129 }
6131 {
6134 }
6136 {
6139 }
6141 /* Generate relocs for the dynamic linker. */
6146 {
6152 {
6155 {
6162 outrel.r_info
6164 }
6165 }
6172 else
6175 {
6179 }
6184 }
6186 /* Init the .got section contents if we're not
6187 emitting a reloc. */
6188 else
6189 {
6195 {
6201 {
6205 }
6206 }
6209 }
6214 }
6219 }
6225 {
6227 {
6233 {
6237 {
6240 }
6241 }
6242 }
6243 }
6248 /* Addends on got relocations don't make much sense.
6249 x+off@got is actually x@got+off, and since the got is
6250 generated by a hash table traversal, the value in the
6251 got at entry m+n bears little relation to the entry m. */
6255 input_bfd,
6256 input_section,
6259 sym_name);
6260 }
6263 /* Relocations that need no special processing. */
6265 /* It makes no sense to point a local relocation
6266 at a symbol not in this object. */
6268 {
6271 input_bfd,
6272 input_section,
6274 TRUE))
6277 }
6287 /* Relocations that may need to be propagated if this is a shared
6288 object. */
6294 /* The TPREL16 relocs shouldn't really be used in shared
6295 libs as they will result in DT_TEXTREL being set, but
6296 support them anyway. */
6323 /* If these relocations are not to a named symbol, they can be
6324 handled right here, no need to bother the dynamic linker. */
6328 /* fall through */
6330 /* Relocations that always need to be propagated if this is a shared
6331 object. */
6343 dodyn:
6346 /* Fall thru. */
6354 || (ELIMINATE_COPY_RELOCS
6361 {
6364 #ifdef DEBUG
6369 #endif
6371 /* When generating a shared object, these relocations
6372 are copied into the output file to be resolved at run
6373 time. */
6375 {
6378 name = (bfd_elf_string_from_elf_section
6387 input_section),
6392 }
6408 {
6412 }
6413 else
6414 {
6419 else
6420 {
6426 {
6429 }
6430 else
6431 {
6434 /* We are turning this relocation into one
6435 against a section symbol. It would be
6436 proper to subtract the symbol's value,
6437 osec->vma, from the emitted reloc addend,
6438 but ld.so expects buggy relocs. */
6442 {
6445 }
6447 #ifdef DEBUG
6452 #endif
6453 }
6456 }
6457 }
6466 /* This reloc will be computed at runtime. We clear the memory
6467 so that it contains predictable value. */
6471 {
6475 }
6476 }
6481 {
6488 else
6493 }
6496 /* Fall thru */
6502 /* Fall thru */
6505 relax32:
6506 {
6513 /* We're clearing the bits for R_PPC_ADDR16_HA
6514 and R_PPC_ADDR16_LO here. */
6518 /* t0 is HA, t1 is LO */
6525 }
6528 /* Indirect .sdata relocation. */
6531 relocation
6536 /* Indirect .sdata2 relocation. */
6539 relocation
6544 /* Handle the TOC16 reloc. We want to use the offset within the .got
6545 section, not the actual VMA. This is appropriate when generating
6546 an embedded ELF object, for which the .got section acts like the
6547 AIX .toc section. */
6558 /* Relocation is to the entry for this symbol in the
6559 procedure linkage table. */
6560 {
6566 {
6567 /* We didn't make a PLT entry for this symbol. This
6568 happens when statically linking PIC code, or when
6569 using -Bsymbolic. */
6571 }
6578 else
6582 }
6585 /* Relocate against _SDA_BASE_. */
6587 {
6597 {
6601 input_bfd,
6602 sym_name,
6604 name);
6605 }
6610 }
6613 /* Relocate against _SDA2_BASE_. */
6615 {
6623 {
6627 input_bfd,
6628 sym_name,
6630 name);
6635 }
6640 }
6643 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
6646 {
6657 {
6663 }
6667 {
6673 }
6677 {
6679 }
6681 else
6682 {
6686 input_bfd,
6687 sym_name,
6689 name);
6694 }
6701 }
6702 }
6705 /* Relocate against the beginning of the section. */
6714 /* Negative relocations. */
6740 input_bfd,
6742 sym_name);
6747 }
6749 /* Do any further special processing. */
6751 {
6762 /* It's just possible that this symbol is a weak symbol
6763 that's not actually defined anywhere. In that case,
6764 'sec' would be NULL, and we should leave the symbol
6765 alone (it will be set to zero elsewhere in the link). */
6768 /* Fall thru */
6776 /* Add 0x10000 if sign bit in 0:15 is set.
6777 Bits 0:15 are not used. */
6780 }
6782 #ifdef DEBUG
6787 sym_name,
6788 r_symndx,
6791 #endif
6796 {
6799 input_bfd,
6800 input_section,
6803 sym_name);
6805 }
6808 input_bfd,
6809 input_section,
6810 contents,
6812 relocation,
6813 addend);
6816 {
6818 {
6824 {
6825 /* Assume this is a call protected by other code that
6826 detect the symbol is undefined. If this is the case,
6827 we can safely ignore the overflow. If not, the
6828 program is hosed anyway, and a little warning isn't
6829 going to help. */
6832 }
6836 sym_name,
6839 input_bfd,
6840 input_section,
6843 }
6844 else
6845 {
6851 }
6852 }
6853 }
6855 #ifdef DEBUG
6857 #endif
6860 }
6861 \f
6862 #define PPC_LO(v) ((v) & 0xffff)
6863 #define PPC_HI(v) (((v) >> 16) & 0xffff)
6864 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
6866 /* Finish up dynamic symbol handling. We set the contents of various
6867 dynamic sections here. */
6869 static bfd_boolean
6874 {
6877 bfd_boolean doneone;
6879 #ifdef DEBUG
6882 #endif
6890 {
6892 {
6893 Elf_Internal_Rela rela;
6895 bfd_vma reloc_index;
6899 else
6900 {
6906 }
6908 /* This symbol has an entry in the procedure linkage table.
6909 Set it up. */
6911 {
6912 bfd_vma got_offset;
6915 /* The first three entries in .got.plt are reserved. */
6918 /* Use the right PLT. */
6922 /* Fill in the .plt on VxWorks. */
6924 {
6934 }
6935 else
6936 {
6937 bfd_vma got_loc
6938 = (got_offset
6951 }
6958 /* This instruction is an immediate load. The value loaded is
6959 the byte offset of the R_PPC_JMP_SLOT relocation from the
6960 start of the .rela.plt section. The value is stored in the
6961 low-order 16 bits of the load instruction. */
6962 /* NOTE: It appears that this is now an index rather than a
6963 prescaled offset. */
6967 /* This instruction is a PC-relative branch whose target is
6968 the start of the PLT section. The address of this branch
6969 instruction is 20 bytes beyond the start of this PLT entry.
6970 The address is encoded in bits 6-29, inclusive. The value
6971 stored is right-shifted by two bits, permitting a 26-bit
6972 offset. */
6982 /* Fill in the GOT entry corresponding to this PLT slot with
6983 the address immediately after the the "bctr" instruction
6984 in this PLT entry. */
6991 {
6992 /* Fill in a couple of entries in .rela.plt.unloaded. */
6998 /* Provide the @ha relocation for the first instruction. */
7003 R_PPC_ADDR16_HA);
7008 /* Provide the @l relocation for the second instruction. */
7013 R_PPC_ADDR16_LO);
7018 /* Provide a relocation for the GOT entry corresponding to this
7019 PLT slot. Point it at the middle of the .plt entry. */
7024 R_PPC_ADDR32);
7027 }
7029 /* VxWorks uses non-standard semantics for R_PPC_JMP_SLOT.
7030 In particular, the offset for the relocation is not the
7031 address of the PLT entry for this function, as specified
7032 by the ABI. Instead, the offset is set to the address of
7033 the GOT slot for this function. See EABI 4.4.4.1. */
7038 }
7039 else
7040 {
7045 {
7046 /* We don't need to fill in the .plt. The ppc dynamic
7047 linker will fill it in. */
7048 }
7049 else
7050 {
7056 }
7057 }
7059 /* Fill in the entry in the .rela.plt section. */
7068 {
7069 /* Mark the symbol as undefined, rather than as defined in
7070 the .plt section. Leave the value alone. */
7072 /* If the symbol is weak, we do need to clear the value.
7073 Otherwise, the PLT entry would provide a definition for
7074 the symbol even if the symbol wasn't defined anywhere,
7075 and so the symbol would never be NULL. */
7078 }
7080 }
7083 {
7084 bfd_vma plt;
7093 {
7108 {
7117 }
7118 else
7119 {
7128 }
7129 }
7130 else
7131 {
7141 /* We only need one non-PIC glink stub. */
7143 }
7144 }
7145 else
7147 }
7150 {
7152 Elf_Internal_Rela rela;
7155 /* This symbols needs a copy reloc. Set it up. */
7157 #ifdef DEBUG
7159 #endif
7165 else
7176 }
7178 #ifdef DEBUG
7180 #endif
7182 /* Mark some specially defined symbols as absolute. */
7191 }
7192 \f
7193 static enum elf_reloc_type_class
7195 {
7197 {
7208 }
7209 }
7210 \f
7211 /* Finish up the dynamic sections. */
7213 static bfd_boolean
7216 {
7220 bfd_vma got;
7223 #ifdef DEBUG
7225 #endif
7232 else
7242 {
7250 {
7251 Elf_Internal_Dyn dyn;
7257 {
7261 else
7281 {
7285 }
7290 }
7293 }
7294 }
7296 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
7297 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
7299 {
7301 bfd_vma val;
7313 }
7315 /* Fill in the first entry in the VxWorks procedure linkage table. */
7317 {
7318 /* Use the right PLT. */
7324 {
7325 bfd_vma got_value =
7335 }
7336 else
7337 {
7340 }
7349 {
7350 Elf_Internal_Rela rela;
7355 /* Output the @ha relocation for the first instruction. */
7364 /* Output the @l relocation for the second instruction. */
7373 /* Fix up the remaining relocations. They may have the wrong
7374 symbol index for _G_O_T_ or _P_L_T_ depending on the order
7375 in which symbols were output. */
7377 {
7378 Elf_Internal_Rela rel;
7394 }
7395 }
7396 }
7399 {
7402 bfd_vma res0;
7405 /*
7406 * PIC glink code is the following:
7407 *
7408 * # ith PLT code stub.
7409 * addis 11,30,(plt+(i-1)*4-got)@ha
7410 * lwz 11,(plt+(i-1)*4-got)@l(11)
7411 * mtctr 11
7412 * bctr
7413 *
7414 * # A table of branches, one for each plt entry.
7415 * # The idea is that the plt call stub loads ctr (and r11) with these
7416 * # addresses, so (r11 - res_0) gives the plt index * 4.
7417 * res_0: b PLTresolve
7418 * res_1: b PLTresolve
7419 * .
7420 * # Some number of entries towards the end can be nops
7421 * res_n_m3: nop
7422 * res_n_m2: nop
7423 * res_n_m1:
7424 *
7425 * PLTresolve:
7426 * addis 11,11,(1f-res_0)@ha
7427 * mflr 0
7428 * bcl 20,31,1f
7429 * 1: addi 11,11,(1b-res_0)@l
7430 * mflr 12
7431 * mtlr 0
7432 * sub 11,11,12 # r11 = index * 4
7433 * addis 12,12,(got+4-1b)@ha
7434 * lwz 0,(got+4-1b)@l(12) # got[1] address of dl_runtime_resolve
7435 * lwz 12,(got+8-1b)@l(12) # got[2] contains the map address
7436 * mtctr 0
7437 * add 0,11,11
7438 * add 11,0,11 # r11 = index * 12 = reloc offset.
7439 * bctr
7440 */
7442 {
7443 ADDIS_11_11,
7444 MFLR_0,
7445 BCL_20_31,
7446 ADDI_11_11,
7447 MFLR_12,
7448 MTLR_0,
7449 SUB_11_11_12,
7450 ADDIS_12_12,
7451 LWZ_0_12,
7452 LWZ_12_12,
7453 MTCTR_0,
7454 ADD_0_11_11,
7455 ADD_11_0_11,
7456 BCTR,
7457 NOP,
7458 NOP
7459 };
7462 {
7463 LIS_12,
7464 ADDIS_11_11,
7465 LWZ_0_12,
7466 ADDI_11_11,
7467 MTCTR_0,
7468 ADD_0_11_11,
7469 LWZ_12_12,
7470 ADD_11_0_11,
7471 BCTR,
7472 NOP,
7473 NOP,
7474 NOP,
7475 NOP,
7476 NOP,
7477 NOP,
7478 NOP
7479 };
7486 /* Build the branch table, one for each plt entry (less one),
7487 and perhaps some padding. */
7493 {
7496 }
7498 {
7501 }
7507 /* Last comes the PLTresolve stub. */
7509 {
7510 bfd_vma bcl;
7513 {
7516 }
7530 {
7535 }
7536 else
7537 {
7542 }
7543 }
7544 else
7545 {
7547 {
7550 }
7560 {
7565 }
7566 else
7567 {
7572 }
7573 }
7574 }
7577 }
7578 \f
7579 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
7581 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
7583 #define ELF_ARCH bfd_arch_powerpc
7584 #define ELF_MACHINE_CODE EM_PPC
7585 #ifdef __QNXTARGET__
7586 #define ELF_MAXPAGESIZE 0x1000
7587 #else
7588 #define ELF_MAXPAGESIZE 0x10000
7589 #endif
7590 #define ELF_MINPAGESIZE 0x1000
7591 #define ELF_COMMONPAGESIZE 0x1000
7592 #define elf_info_to_howto ppc_elf_info_to_howto
7594 #ifdef EM_CYGNUS_POWERPC
7595 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
7596 #endif
7598 #ifdef EM_PPC_OLD
7599 #define ELF_MACHINE_ALT2 EM_PPC_OLD
7600 #endif
7602 #define elf_backend_plt_not_loaded 1
7603 #define elf_backend_can_gc_sections 1
7604 #define elf_backend_can_refcount 1
7605 #define elf_backend_rela_normal 1
7607 #define bfd_elf32_mkobject ppc_elf_mkobject
7608 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
7609 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
7610 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
7611 #define bfd_elf32_bfd_reloc_name_lookup ppc_elf_reloc_name_lookup
7612 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
7613 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create
7615 #define elf_backend_object_p ppc_elf_object_p
7616 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
7617 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
7618 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
7619 #define elf_backend_relocate_section ppc_elf_relocate_section
7620 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
7621 #define elf_backend_check_relocs ppc_elf_check_relocs
7622 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol
7623 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
7624 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
7625 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
7626 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
7627 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
7628 #define elf_backend_fake_sections ppc_elf_fake_sections
7629 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
7630 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
7631 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
7632 #define elf_backend_write_core_note ppc_elf_write_core_note
7633 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
7634 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing
7635 #define elf_backend_final_write_processing ppc_elf_final_write_processing
7636 #define elf_backend_write_section ppc_elf_write_section
7637 #define elf_backend_get_sec_type_attr ppc_elf_get_sec_type_attr
7638 #define elf_backend_plt_sym_val ppc_elf_plt_sym_val
7639 #define elf_backend_action_discarded ppc_elf_action_discarded
7640 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
7644 /* VxWorks Target */
7646 #undef TARGET_LITTLE_SYM
7647 #undef TARGET_LITTLE_NAME
7649 #undef TARGET_BIG_SYM
7650 #define TARGET_BIG_SYM bfd_elf32_powerpc_vxworks_vec
7651 #undef TARGET_BIG_NAME
7654 /* VxWorks uses the elf default section flags for .plt. */
7657 {
7665 }
7667 /* Like ppc_elf_link_hash_table_create, but overrides
7668 appropriately for VxWorks. */
7671 {
7676 {
7684 }
7686 }
7688 /* Tweak magic VxWorks symbols as they are loaded. */
7689 static bfd_boolean
7697 {
7699 valp))
7703 }
7705 static void
7707 {
7710 }
7712 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
7713 define it. */
7714 #undef elf_backend_want_plt_sym
7715 #define elf_backend_want_plt_sym 1
7716 #undef elf_backend_want_got_plt
7717 #define elf_backend_want_got_plt 1
7718 #undef elf_backend_got_symbol_offset
7719 #define elf_backend_got_symbol_offset 0
7720 #undef elf_backend_plt_not_loaded
7721 #define elf_backend_plt_not_loaded 0
7722 #undef elf_backend_plt_readonly
7723 #define elf_backend_plt_readonly 1
7724 #undef elf_backend_got_header_size
7725 #define elf_backend_got_header_size 12
7727 #undef bfd_elf32_bfd_link_hash_table_create
7728 #define bfd_elf32_bfd_link_hash_table_create \
7729 ppc_elf_vxworks_link_hash_table_create
7730 #undef elf_backend_add_symbol_hook
7731 #define elf_backend_add_symbol_hook \
7732 ppc_elf_vxworks_add_symbol_hook
7733 #undef elf_backend_link_output_symbol_hook
7734 #define elf_backend_link_output_symbol_hook \
7735 elf_vxworks_link_output_symbol_hook
7736 #undef elf_backend_final_write_processing
7737 #define elf_backend_final_write_processing \
7738 ppc_elf_vxworks_final_write_processing
7739 #undef elf_backend_get_sec_type_attr
7740 #define elf_backend_get_sec_type_attr \
7741 ppc_elf_vxworks_get_sec_type_attr
7742 #undef elf_backend_emit_relocs
7743 #define elf_backend_emit_relocs \
7744 elf_vxworks_emit_relocs
7746 #undef elf32_bed
7747 #define elf32_bed ppc_elf_vxworks_bed