| blob | 47a2e79169f8494bac976df1b3ee43160eae27bf |
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, 2008 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 #define is_ppc_elf(bfd) \
1740 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
1741 && elf_object_id (bfd) == PPC32_ELF_TDATA)
1743 /* Override the generic function because we store some extras. */
1745 static bfd_boolean
1747 {
1749 PPC32_ELF_TDATA);
1750 }
1752 /* Fix bad default arch selected for a 32 bit input bfd when the
1753 default is 64 bit. */
1755 static bfd_boolean
1757 {
1759 {
1763 {
1764 /* Relies on arch after 64 bit default being 32 bit default. */
1767 }
1768 }
1770 }
1772 /* Function to set whether a module needs the -mrelocatable bit set. */
1774 static bfd_boolean
1776 {
1783 }
1785 /* Support for core dump NOTE sections. */
1787 static bfd_boolean
1789 {
1794 {
1799 /* pr_cursig */
1802 /* pr_pid */
1805 /* pr_reg */
1810 }
1812 /* Make a ".reg/999" section. */
1815 }
1817 static bfd_boolean
1819 {
1821 {
1830 }
1832 /* Note that for some reason, a spurious space is tacked
1833 onto the end of the args in some (at least one anyway)
1834 implementations, so strip it off if it exists. */
1836 {
1842 }
1845 }
1849 {
1851 {
1856 {
1867 }
1870 {
1889 }
1890 }
1891 }
1893 /* Return address for Ith PLT stub in section PLT, for relocation REL
1894 or (bfd_vma) -1 if it should not be included. */
1896 static bfd_vma
1900 {
1902 }
1904 /* Handle a PowerPC specific section when reading an object file. This
1905 is called when bfd_section_from_shdr finds a section with an unknown
1906 type. */
1908 static bfd_boolean
1913 {
1915 flagword flags;
1930 }
1932 /* Set up any other section flags and such that may be necessary. */
1934 static bfd_boolean
1938 {
1946 }
1948 /* If we have .sbss2 or .PPC.EMB.sbss0 output sections, we
1949 need to bump up the number of section headers. */
1951 static int
1954 {
1967 }
1969 /* Add extra PPC sections -- Note, for now, make .sbss2 and
1970 .PPC.EMB.sbss0 a normal section, and not a bss section so
1971 that the linker doesn't crater when trying to make more than
1972 2 sections. */
1975 {
1986 };
1988 /* This is what we want for new plt/got. */
1994 {
1997 /* See if this is one of the special sections. */
2004 {
2008 }
2011 }
2012 \f
2013 /* Very simple linked list structure for recording apuinfo values. */
2015 {
2018 }
2019 apuinfo_list;
2024 static void
2026 {
2028 }
2030 static void
2032 {
2036 {
2040 }
2049 }
2051 static unsigned
2053 {
2058 entry;
2063 }
2067 {
2073 ;
2076 }
2078 static void
2080 {
2084 {
2088 }
2091 }
2096 /* Scan the input BFDs and create a linked list of
2097 the APUinfo values that will need to be emitted. */
2099 static void
2101 {
2106 bfd_size_type output_section_size;
2116 /* Scan the input bfds, looking for apuinfo sections. */
2121 {
2124 {
2127 }
2128 }
2130 /* We need at least one input sections
2131 in order to make merging worthwhile. */
2135 /* Just make sure that the output section exists as well. */
2140 /* Allocate a buffer for the contents of the input sections. */
2148 /* Read in the input sections contents. */
2150 {
2160 {
2163 }
2167 {
2170 }
2172 /* Process the contents of the section. */
2176 /* Verify the contents of the header. Note - we have to
2177 extract the values this way in order to allow for a
2178 host whose endian-ness is different from the target. */
2190 /* Get the number of bytes used for apuinfo entries. */
2195 /* Make sure that we do not run off the end of the section. */
2199 /* Scan the apuinfo section, building a list of apuinfo numbers. */
2203 /* Update the offset. */
2205 }
2209 /* Compute the size of the output section. */
2219 fail:
2224 }
2226 /* Prevent the output section from accumulating the input sections'
2227 contents. We have already stored this in our linked list structure. */
2229 static bfd_boolean
2234 {
2237 }
2239 /* Finally we can generate the output section. */
2241 static void
2243 {
2248 bfd_size_type length;
2263 {
2267 }
2269 /* Create the apuinfo header. */
2278 {
2281 }
2292 }
2293 \f
2294 /* The following functions are specific to the ELF linker, while
2295 functions above are used generally. They appear in this file more
2296 or less in the order in which they are called. eg.
2297 ppc_elf_check_relocs is called early in the link process,
2298 ppc_elf_finish_dynamic_sections is one of the last functions
2299 called. */
2301 /* The PPC linker needs to keep track of the number of relocs that it
2302 decides to copy as dynamic relocs in check_relocs for each symbol.
2303 This is so that it can later discard them if they are found to be
2304 unnecessary. We store the information in a field extending the
2305 regular ELF linker hash table. */
2307 struct ppc_elf_dyn_relocs
2308 {
2311 /* The input section of the reloc. */
2314 /* Total number of relocs copied for the input section. */
2315 bfd_size_type count;
2317 /* Number of pc-relative relocs copied for the input section. */
2318 bfd_size_type pc_count;
2319 };
2321 /* Track PLT entries needed for a given symbol. We might need more
2322 than one glink entry per symbol. */
2323 struct plt_entry
2324 {
2327 /* -fPIC uses multiple GOT sections, one per file, called ".got2".
2328 This field stores the offset into .got2 used to initialise the
2329 GOT pointer reg. It will always be at least 32768 (and for
2330 current gcc this is the only offset used). */
2331 bfd_vma addend;
2333 /* The .got2 section. */
2336 /* PLT refcount or offset. */
2337 union
2338 {
2339 bfd_signed_vma refcount;
2340 bfd_vma offset;
2343 /* .glink stub offset. */
2344 bfd_vma glink_offset;
2345 };
2347 /* Of those relocs that might be copied as dynamic relocs, this macro
2348 selects those that must be copied when linking a shared library,
2349 even when the symbol is local. */
2351 #define MUST_BE_DYN_RELOC(RTYPE) \
2352 ((RTYPE) != R_PPC_REL24 \
2353 && (RTYPE) != R_PPC_REL14 \
2354 && (RTYPE) != R_PPC_REL14_BRTAKEN \
2355 && (RTYPE) != R_PPC_REL14_BRNTAKEN \
2356 && (RTYPE) != R_PPC_REL32)
2358 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
2359 copying dynamic variables from a shared lib into an app's dynbss
2360 section, and instead use a dynamic relocation to point into the
2361 shared lib. */
2362 #define ELIMINATE_COPY_RELOCS 1
2364 /* PPC ELF linker hash entry. */
2366 struct ppc_elf_link_hash_entry
2367 {
2370 /* If this symbol is used in the linker created sections, the processor
2371 specific backend uses this field to map the field into the offset
2372 from the beginning of the section. */
2375 /* Track dynamic relocs copied for this symbol. */
2378 /* Contexts in which symbol is used in the GOT (or TOC).
2379 TLS_GD .. TLS_TLS bits are or'd into the mask as the
2380 corresponding relocs are encountered during check_relocs.
2381 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
2382 indicate the corresponding GOT entry type is not needed. */
2391 /* Nonzero if we have seen a small data relocation referring to this
2392 symbol. */
2394 };
2396 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent))
2398 /* PPC ELF linker hash table. */
2400 struct ppc_elf_link_hash_table
2401 {
2404 /* Short-cuts to get to dynamic linker sections. */
2417 /* The (unloaded but important) .rela.plt.unloaded on VxWorks. */
2420 /* The .got.plt section (VxWorks only)*/
2423 /* Shortcut to .__tls_get_addr. */
2426 /* The bfd that forced an old-style PLT. */
2429 /* TLS local dynamic got entry handling. */
2431 bfd_signed_vma refcount;
2432 bfd_vma offset;
2435 /* Offset of PltResolve function in glink. */
2436 bfd_vma glink_pltresolve;
2438 /* Size of reserved GOT entries. */
2440 /* Non-zero if allocating the header left a gap. */
2443 /* The type of PLT we have chosen to use. */
2446 /* Set if we should emit symbols for stubs. */
2449 /* True if the target system is VxWorks. */
2452 /* The size of PLT entries. */
2454 /* The distance between adjacent PLT slots. */
2456 /* The size of the first PLT entry. */
2459 /* Small local sym to section mapping cache. */
2461 };
2463 /* Get the PPC ELF linker hash table from a link_info structure. */
2465 #define ppc_elf_hash_table(p) \
2466 ((struct ppc_elf_link_hash_table *) (p)->hash)
2468 /* Create an entry in a PPC ELF linker hash table. */
2474 {
2475 /* Allocate the structure if it has not already been allocated by a
2476 subclass. */
2478 {
2483 }
2485 /* Call the allocation method of the superclass. */
2488 {
2492 }
2495 }
2497 /* Create a PPC ELF linker hash table. */
2501 {
2509 ppc_elf_link_hash_newfunc,
2511 {
2514 }
2534 }
2536 /* Create .got and the related sections. */
2538 static bfd_boolean
2540 {
2543 flagword flags;
2554 {
2558 }
2559 else
2560 {
2561 /* The powerpc .got has a blrl instruction in it. Mark it
2562 executable. */
2567 }
2577 }
2579 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2580 to output sections (just like _bfd_elf_create_dynamic_sections has
2581 to create .dynbss and .rela.bss). */
2583 static bfd_boolean
2585 {
2588 flagword flags;
2616 {
2623 }
2636 /* The VxWorks PLT is a loaded section with contents. */
2639 }
2641 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2643 static void
2647 {
2654 {
2656 {
2660 /* Add reloc counts against the indirect sym to the direct sym
2661 list. Merge any entries against the same section. */
2663 {
2668 {
2673 }
2676 }
2678 }
2682 }
2687 /* If called to transfer flags for a weakdef during processing
2688 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
2689 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
2701 /* If we were called to copy over info for a weak sym, that's all. */
2705 /* Copy over the GOT refcount entries that we may have already seen to
2706 the symbol which just became indirect. */
2710 /* And plt entries. */
2712 {
2714 {
2719 {
2724 {
2728 }
2731 }
2733 }
2737 }
2740 {
2748 }
2749 }
2751 /* Hook called by the linker routine which adds symbols from an object
2752 file. We use it to put .comm items in .sbss, and not .bss. */
2754 static bfd_boolean
2762 {
2767 {
2768 /* Common symbols less than or equal to -G nn bytes are automatically
2769 put into .sbss. */
2774 {
2782 flags);
2785 }
2789 }
2792 }
2793 \f
2794 static bfd_boolean
2797 {
2806 }
2808 /* Create a special linker section. */
2810 static bfd_boolean
2813 flagword flags,
2815 {
2822 /* Record the first bfd that needs the special sections. */
2828 flags);
2835 }
2837 /* Find a linker generated pointer with a given addend and type. */
2840 elf_find_pointer_linker_section
2842 bfd_vma addend,
2844 {
2850 }
2852 /* Allocate a pointer to live in a linker created section. */
2854 static bfd_boolean
2859 {
2863 bfd_size_type amt;
2867 /* Is this a global symbol? */
2869 {
2872 /* Has this symbol already been allocated? If so, our work is done. */
2876 lsect))
2880 }
2881 else
2882 {
2885 /* Allocation of a pointer to a local symbol. */
2888 /* Allocate a table to hold the local symbols if first time. */
2890 {
2901 }
2903 /* Has this symbol already been allocated? If so, our work is done. */
2906 lsect))
2910 }
2912 /* Allocate space for a pointer in the linker section, and allocate
2913 a new pointer record from internal memory. */
2929 #ifdef DEBUG
2934 #endif
2937 }
2939 static bfd_boolean
2944 {
2949 {
2957 }
2963 }
2965 static bfd_boolean
2968 {
2977 {
2987 }
2990 }
2994 {
3003 }
3005 static void
3007 {
3010 abfd,
3013 }
3015 /* Look through the relocs for a section during the first phase, and
3016 allocate space in the global offset table or procedure linkage
3017 table. */
3019 static bfd_boolean
3024 {
3035 /* Don't do anything special with non-loaded, non-alloced sections.
3036 In particular, any relocs in such sections should not affect GOT
3037 and PLT reference counting (ie. we don't allow them to create GOT
3038 or PLT entries), there's no possibility or desire to optimize TLS
3039 relocs, and there's not much point in propagating relocs to shared
3040 libs that the dynamic linker won't relocate. */
3044 #ifdef DEBUG
3047 #endif
3051 /* Initialize howto table if not already done. */
3063 {
3072 else
3073 {
3078 }
3080 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
3081 This shows up in particular in an R_PPC_ADDR32 in the eabi
3082 startup code. */
3086 {
3092 }
3096 {
3125 dogottls:
3127 /* Fall thru */
3129 /* GOT16 relocations */
3134 /* This symbol requires a global offset table entry. */
3136 {
3141 }
3143 {
3146 }
3147 else
3148 /* This is a global offset table entry for a local symbol. */
3153 /* Indirect .sdata relocation. */
3156 {
3159 }
3168 {
3171 }
3174 /* Indirect .sdata2 relocation. */
3177 {
3180 }
3189 {
3192 }
3197 {
3200 }
3205 {
3208 }
3213 {
3216 }
3221 {
3224 }
3230 {
3233 }
3241 {
3244 }
3253 {
3256 }
3267 #ifdef DEBUG
3269 #endif
3270 /* This symbol requires a procedure linkage table entry. We
3271 actually build the entry in finish_dynamic_symbol,
3272 because this might be a case of linking PIC code without
3273 linking in any dynamic objects, in which case we don't
3274 need to generate a procedure linkage table after all. */
3277 {
3278 /* It does not make sense to have a procedure linkage
3279 table entry for a local symbol. */
3282 abfd,
3283 sec,
3288 }
3289 else
3290 {
3294 {
3297 }
3301 }
3304 /* The following relocations don't need to propagate the
3305 relocation if linking a shared object since they are
3306 section relative. */
3325 /* These are just markers. */
3332 /* These should only appear in dynamic objects. */
3339 /* These aren't handled yet. We'll report an error later. */
3348 /* This refers only to functions defined in the shared library. */
3351 {
3354 }
3357 /* This relocation describes the C++ object vtable hierarchy.
3358 Reconstruct it for later use during GC. */
3364 /* This relocation describes which C++ vtable entries are actually
3365 used. Record for later use during GC. */
3373 /* We shouldn't really be seeing these. */
3379 /* Nor these. */
3398 {
3399 /* Old -fPIC gcc code has .long LCTOC1-LCFx just before
3400 the start of a function, which assembles to a REL32
3401 reference to .got2. If we detect one of these, then
3402 force the old PLT layout because the linker cannot
3403 reliably deduce the GOT pointer value needed for
3404 PLT call stubs. */
3408 r_symndx);
3410 {
3413 }
3414 }
3417 /* fall through */
3427 {
3428 /* We may need a plt entry if the symbol turns out to be
3429 a function defined in a dynamic object. */
3433 /* We may need a copy reloc too. */
3436 }
3446 {
3448 {
3451 }
3453 }
3454 /* fall through */
3461 {
3462 /* We may need a plt entry if the symbol turns out to be
3463 a function defined in a dynamic object. */
3467 }
3469 dodyn:
3470 /* If we are creating a shared library, and this is a reloc
3471 against a global symbol, or a non PC relative reloc
3472 against a local symbol, then we need to copy the reloc
3473 into the shared library. However, if we are linking with
3474 -Bsymbolic, we do not need to copy a reloc against a
3475 global symbol which is defined in an object we are
3476 including in the link (i.e., DEF_REGULAR is set). At
3477 this point we have not seen all the input files, so it is
3478 possible that DEF_REGULAR is not set now but will be set
3479 later (it is never cleared). In case of a weak definition,
3480 DEF_REGULAR may be cleared later by a strong definition in
3481 a shared library. We account for that possibility below by
3482 storing information in the dyn_relocs field of the hash
3483 table entry. A similar situation occurs when creating
3484 shared libraries and symbol visibility changes render the
3485 symbol local.
3487 If on the other hand, we are creating an executable, we
3488 may need to keep relocations for symbols satisfied by a
3489 dynamic library if we manage to avoid copy relocs for the
3490 symbol. */
3497 || (ELIMINATE_COPY_RELOCS
3502 {
3506 #ifdef DEBUG
3508 "ppc_elf_check_relocs needs to "
3512 #endif
3514 {
3517 name = (bfd_elf_string_from_elf_section
3532 {
3533 flagword flags;
3539 name,
3540 flags);
3545 }
3547 }
3549 /* If this is a global symbol, we count the number of
3550 relocations we need for this symbol. */
3552 {
3554 }
3555 else
3556 {
3557 /* Track dynamic relocs needed for local syms too.
3558 We really need local syms available to do this
3559 easily. Oh well. */
3571 }
3575 {
3584 }
3589 }
3592 }
3593 }
3596 }
3597 \f
3599 /* Merge object attributes from IBFD into OBFD. Raise an error if
3600 there are conflicting attributes. */
3601 static bfd_boolean
3603 {
3608 {
3609 /* This is the first object. Copy the attributes. */
3612 /* Use the Tag_null value to indicate the attributes have been
3613 initialized. */
3617 }
3622 /* Check for conflicting Tag_GNU_Power_ABI_FP attributes and merge
3623 non-conflicting ones. */
3627 {
3632 ;
3634 _bfd_error_handler
3637 _bfd_error_handler
3640 _bfd_error_handler
3643 else
3644 _bfd_error_handler
3647 }
3649 /* Check for conflicting Tag_GNU_Power_ABI_Vector attributes and
3650 merge non-conflicting ones. */
3654 {
3658 {
3662 }
3665 {
3669 }
3675 ;
3676 /* For now, allow generic to transition to AltiVec or SPE
3677 without a warning. If GCC marked files with their stack
3678 alignment and used don't-care markings for files which are
3679 not affected by the vector ABI, we could warn about this
3680 case too. */
3684 ;
3686 _bfd_error_handler
3690 _bfd_error_handler
3693 else
3694 _bfd_error_handler
3697 }
3699 /* Merge Tag_compatibility attributes and any common GNU ones. */
3703 }
3705 /* Merge backend specific data from an object file to the output
3706 object file when linking. */
3708 static bfd_boolean
3710 {
3711 flagword old_flags;
3712 flagword new_flags;
3713 bfd_boolean error;
3718 /* Check if we have the same endianess. */
3728 {
3729 /* First call, no flags set. */
3732 }
3734 /* Compatible flags are ok. */
3736 ;
3738 /* Incompatible flags. */
3739 else
3740 {
3741 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
3742 to be linked with either. */
3746 {
3751 }
3754 {
3759 }
3761 /* The output is -mrelocatable-lib iff both the input files are. */
3765 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
3766 but each input file is either -mrelocatable or -mrelocatable-lib. */
3772 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
3773 any module uses it. */
3779 /* Warn about any other mismatches. */
3781 {
3787 }
3790 {
3793 }
3794 }
3797 }
3798 \f
3799 /* Choose which PLT scheme to use, and set .plt flags appropriately.
3800 Returns -1 on error, 0 for old PLT, 1 for new PLT. */
3801 int
3806 {
3808 flagword flags;
3813 {
3816 else
3817 {
3821 /* Look through the reloc flags left by ppc_elf_check_relocs.
3822 Use the old style bss plt if a file makes plt calls
3823 without using the new relocs, and if ld isn't given
3824 --secure-plt and we never see REL16 relocs. */
3829 {
3833 {
3837 }
3838 }
3840 }
3841 }
3850 {
3854 /* The new PLT is a loaded section. */
3859 /* The new GOT is not executable. */
3863 }
3864 else
3865 {
3866 /* Stop an unused .glink section from affecting .text alignment. */
3870 }
3872 }
3873 \f
3874 /* Return the section that should be marked against GC for a given
3875 relocation. */
3883 {
3886 {
3890 }
3893 }
3895 /* Update the got, plt and dynamic reloc reference counts for the
3896 section being removed. */
3898 static bfd_boolean
3903 {
3927 {
3934 {
3946 {
3947 /* Everything must go for SEC. */
3950 }
3951 }
3955 {
3977 {
3980 }
3982 {
3985 }
3995 /* Fall thru */
4018 {
4023 }
4028 }
4029 }
4031 }
4032 \f
4033 /* Set htab->tls_get_addr and call the generic ELF tls_setup function. */
4035 asection *
4037 {
4044 {
4047 }
4052 }
4054 /* Run through all the TLS relocs looking for optimization
4055 opportunities. */
4057 bfd_boolean
4060 {
4070 /* Make two passes through the relocs. First time check that tls
4071 relocs involved in setting up a tls_get_addr call are indeed
4072 followed by such a call. If they are not, exclude them from
4073 the optimizations done on the second pass. */
4076 {
4082 {
4085 /* Read the relocations. */
4093 {
4099 bfd_boolean is_local;
4105 {
4113 }
4123 {
4127 /* Fall thru */
4131 /* These relocs should never be against a symbol
4132 defined in a shared lib. Leave them alone if
4133 that turns out to be the case. */
4137 /* LD -> LE */
4145 /* Fall thru */
4150 /* GD -> LE */
4152 else
4153 /* GD -> IE */
4163 {
4164 /* IE -> LE */
4168 }
4169 else
4174 }
4177 {
4182 {
4187 /* The next instruction should be a call to
4188 __tls_get_addr. Peek at the reloc to be sure. */
4197 {
4208 }
4209 }
4211 /* Uh oh, we didn't find the expected call. We
4212 could just mark this symbol to exclude it
4213 from tls optimization but it's safer to skip
4214 the entire section. */
4217 }
4220 {
4223 }
4224 else
4225 {
4231 {
4238 {
4242 }
4243 }
4251 }
4254 {
4255 /* We managed to get rid of a got entry. */
4258 }
4261 {
4267 }
4271 }
4275 }
4279 {
4282 else
4284 }
4285 }
4287 }
4288 \f
4289 /* Return true if we have dynamic relocs that apply to read-only sections. */
4291 static bfd_boolean
4293 {
4297 {
4304 }
4306 }
4308 /* Adjust a symbol defined by a dynamic object and referenced by a
4309 regular object. The current definition is in some section of the
4310 dynamic object, but we're not including those sections. We have to
4311 change the definition to something the rest of the link can
4312 understand. */
4314 static bfd_boolean
4317 {
4321 #ifdef DEBUG
4324 #endif
4326 /* Make sure we know what is going on here. */
4335 /* Deal with function syms. */
4338 {
4339 /* Clear procedure linkage table information for any symbol that
4340 won't need a .plt entry. */
4349 {
4350 /* A PLT entry is not required/allowed when:
4352 1. We are not using ld.so; because then the PLT entry
4353 can't be set up, so we can't use one. In this case,
4354 ppc_elf_adjust_dynamic_symbol won't even be called.
4356 2. GC has rendered the entry unused.
4358 3. We know for certain that a call to this symbol
4359 will go to this object, or will remain undefined. */
4362 }
4363 else
4364 {
4365 /* After adjust_dynamic_symbol, non_got_ref set means that
4366 dyn_relocs for this symbol should be discarded.
4367 If we get here we know we are making a PLT entry for this
4368 symbol, and in an executable we'd normally resolve
4369 relocations against this symbol to the PLT entry. Allow
4370 dynamic relocs if the reference is weak, and the dynamic
4371 relocs will not cause text relocation. */
4378 }
4380 }
4381 else
4384 /* If this is a weak symbol, and there is a real definition, the
4385 processor independent code will have arranged for us to see the
4386 real definition first, and we can just use the same value. */
4388 {
4396 }
4398 /* This is a reference to a symbol defined by a dynamic object which
4399 is not a function. */
4401 /* If we are creating a shared library, we must presume that the
4402 only references to the symbol are via the global offset table.
4403 For such cases we need not do anything here; the relocations will
4404 be handled correctly by relocate_section. */
4408 /* If there are no references to this symbol that do not use the
4409 GOT, we don't need to generate a copy reloc. */
4413 /* If we didn't find any dynamic relocs in read-only sections, then
4414 we'll be keeping the dynamic relocs and avoiding the copy reloc.
4415 We can't do this if there are any small data relocations. This
4416 doesn't work on VxWorks, where we can not have dynamic
4417 relocations (other than copy and jump slot relocations) in an
4418 executable. */
4424 {
4427 }
4430 {
4434 }
4436 /* We must allocate the symbol in our .dynbss section, which will
4437 become part of the .bss section of the executable. There will be
4438 an entry for this symbol in the .dynsym section. The dynamic
4439 object will contain position independent code, so all references
4440 from the dynamic object to this symbol will go through the global
4441 offset table. The dynamic linker will use the .dynsym entry to
4442 determine the address it must put in the global offset table, so
4443 both the dynamic object and the regular object will refer to the
4444 same memory location for the variable.
4446 Of course, if the symbol is referenced using SDAREL relocs, we
4447 must instead allocate it in .sbss. */
4451 else
4455 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
4456 copy the initial value out of the dynamic object and into the
4457 runtime process image. We need to remember the offset into the
4458 .rela.bss section we are going to use. */
4460 {
4465 else
4470 }
4473 }
4474 \f
4475 /* Generate a symbol to mark plt call stubs. For non-PIC code the sym is
4476 xxxxxxxx.plt_call32.<callee> where xxxxxxxx is a hex number, usually 0,
4477 specifying the addend on the plt relocation. For -fpic code, the sym
4478 is xxxxxxxx.plt_pic32.<callee>, and for -fPIC
4479 xxxxxxxx.got2.plt_pic32.<callee>. */
4481 static bfd_boolean
4485 {
4494 else
4514 {
4523 }
4525 }
4527 /* Allocate NEED contiguous space in .got, and return the offset.
4528 Handles allocation of the got header when crossing 32k. */
4530 static bfd_vma
4532 {
4533 bfd_vma where;
4537 {
4540 }
4541 else
4542 {
4545 {
4548 }
4549 else
4550 {
4553 {
4556 }
4559 }
4560 }
4562 }
4564 /* Allocate space in associated reloc sections for dynamic relocs. */
4566 static bfd_boolean
4568 {
4578 /* When warning symbols are created, they **replace** the "real"
4579 entry in the hash table, thus we never get to see the real
4580 symbol in a hash traversal. So look at it now. */
4585 {
4592 {
4593 /* Make sure this symbol is output as a dynamic symbol. */
4596 {
4599 }
4603 {
4607 {
4609 {
4612 }
4617 {
4620 }
4625 {
4628 }
4634 }
4635 else
4636 {
4638 {
4639 /* If this is the first .plt entry, make room
4640 for the special first entry. */
4644 /* The PowerPC PLT is actually composed of two
4645 parts, the first part is 2 words (for a load
4646 and a jump), and then there is a remaining
4647 word available at the end. */
4654 /* If this symbol is not defined in a regular
4655 file, and we are not generating a shared
4656 library, then set the symbol to this location
4657 in the .plt. This is required to make
4658 function pointers compare as equal between
4659 the normal executable and the shared library. */
4663 {
4666 }
4668 /* Make room for this entry. */
4670 /* After the 8192nd entry, room for two entries
4671 is allocated. */
4677 }
4679 }
4681 /* We also need to make an entry in the .rela.plt section. */
4683 {
4687 {
4688 /* Allocate space for the unloaded relocations. */
4690 {
4693 {
4697 }
4702 }
4704 /* Every PLT entry has an associated GOT entry in
4705 .got.plt. */
4707 }
4709 }
4710 }
4711 else
4713 }
4714 else
4718 {
4721 }
4722 }
4723 else
4724 {
4727 }
4731 {
4732 /* Make sure this symbol is output as a dynamic symbol. */
4735 {
4738 }
4742 {
4743 /* If just an LD reloc, we'll just use htab->tlsld_got.offset. */
4746 }
4747 else
4748 {
4749 bfd_boolean dyn;
4752 {
4761 }
4762 else
4770 {
4771 /* All the entries we allocated need relocs.
4772 Except LD only needs one. */
4776 }
4777 }
4778 }
4779 else
4785 /* In the shared -Bsymbolic case, discard space allocated for
4786 dynamic pc-relative relocs against symbols which turn out to be
4787 defined in regular objects. For the normal shared case, discard
4788 space for relocs that have become local due to symbol visibility
4789 changes. */
4792 {
4793 /* Relocs that use pc_count are those that appear on a call insn,
4794 or certain REL relocs (see MUST_BE_DYN_RELOC) that can be
4795 generated via assembly. We want calls to protected symbols to
4796 resolve directly to the function rather than going via the plt.
4797 If people want function pointer comparisons to work as expected
4798 then they should avoid writing weird assembly. */
4800 {
4804 {
4809 else
4811 }
4812 }
4814 /* Also discard relocs on undefined weak syms with non-default
4815 visibility. */
4818 {
4822 /* Make sure undefined weak symbols are output as a dynamic
4823 symbol in PIEs. */
4826 {
4829 }
4830 }
4831 }
4833 {
4834 /* For the non-shared case, discard space for relocs against
4835 symbols which turn out to need copy relocs or are not
4836 dynamic. */
4840 {
4841 /* Make sure this symbol is output as a dynamic symbol.
4842 Undefined weak syms won't yet be marked as dynamic. */
4845 {
4848 }
4850 /* If that succeeded, we know we'll be keeping all the
4851 relocs. */
4854 }
4858 keep: ;
4859 }
4861 /* Finally, allocate space. */
4863 {
4866 }
4869 }
4871 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
4872 read-only sections. */
4874 static bfd_boolean
4876 {
4884 {
4887 /* Not an error, just cut short the traversal. */
4889 }
4891 }
4893 /* Set the sizes of the dynamic sections. */
4895 static bfd_boolean
4898 {
4901 bfd_boolean relocs;
4904 #ifdef DEBUG
4906 #endif
4912 {
4913 /* Set the contents of the .interp section to the interpreter. */
4915 {
4920 }
4921 }
4928 /* Set up .got offsets for local syms, and space for local dynamic
4929 relocs. */
4931 {
4935 bfd_size_type locsymcount;
4942 {
4949 {
4952 {
4953 /* Input section has been discarded, either because
4954 it is a copy of a linkonce section or due to
4955 linker script /DISCARD/, so we'll be discarding
4956 the relocs too. */
4957 }
4959 {
4966 }
4967 }
4968 }
4980 {
4982 {
4983 /* If just an LD reloc, we'll just use
4984 htab->tlsld_got.offset. */
4987 }
4988 else
4989 {
4992 {
4999 }
5000 else
5006 }
5007 }
5008 else
5010 }
5012 /* Allocate space for global sym dynamic relocs. */
5016 {
5020 }
5021 else
5025 {
5028 /* If we haven't allocated the header, do so now. When we get here,
5029 for old plt/got the got size will be 0 to 32764 (not allocated),
5030 or 32780 to 65536 (header allocated). For new plt/got, the
5031 corresponding ranges are 0 to 32768 and 32780 to 65536. */
5033 {
5038 }
5041 }
5044 {
5046 /* Space for the branch table. */
5048 /* Pad out to align the start of PLTresolve. */
5053 {
5060 {
5069 }
5075 {
5084 }
5085 }
5086 }
5088 /* We've now determined the sizes of the various dynamic sections.
5089 Allocate memory for them. */
5092 {
5105 {
5106 /* We'd like to strip these sections if they aren't needed, but if
5107 we've exported dynamic symbols from them we must leave them.
5108 It's too late to tell BFD to get rid of the symbols. */
5111 /* Strip this section if we don't need it; see the
5112 comment below. */
5113 }
5116 {
5117 /* Strip these too. */
5118 }
5120 {
5122 {
5123 /* Remember whether there are any relocation sections. */
5126 /* We use the reloc_count field as a counter if we need
5127 to copy relocs into the output file. */
5129 }
5130 }
5131 else
5132 {
5133 /* It's not one of our sections, so don't allocate space. */
5135 }
5138 {
5139 /* If we don't need this section, strip it from the
5140 output file. This is mostly to handle .rela.bss and
5141 .rela.plt. We must create both sections in
5142 create_dynamic_sections, because they must be created
5143 before the linker maps input sections to output
5144 sections. The linker does that before
5145 adjust_dynamic_symbol is called, and it is that
5146 function which decides whether anything needs to go
5147 into these sections. */
5150 }
5155 /* Allocate memory for the section contents. */
5159 }
5162 {
5163 /* Add some entries to the .dynamic section. We fill in the
5164 values later, in ppc_elf_finish_dynamic_sections, but we
5165 must add the entries now so that we get the correct size for
5166 the .dynamic section. The DT_DEBUG entry is filled in by the
5167 dynamic linker and used by the debugger. */
5168 #define add_dynamic_entry(TAG, VAL) \
5169 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
5172 {
5175 }
5178 {
5184 }
5187 {
5190 }
5193 {
5198 }
5200 /* If any dynamic relocs apply to a read-only section, then we
5201 need a DT_TEXTREL entry. */
5204 info);
5207 {
5210 }
5214 }
5215 #undef add_dynamic_entry
5218 }
5220 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5222 static bfd_boolean
5224 {
5232 }
5233 \f
5234 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
5237 {
5246 };
5249 {
5254 };
5256 static bfd_boolean
5261 {
5262 struct one_fixup
5263 {
5266 bfd_vma toff;
5267 bfd_vma trampoff;
5268 };
5276 bfd_boolean changed;
5278 bfd_size_type trampoff;
5283 /* Nothing to do if there are no relocations, and no need to do
5284 anything with non-alloc sections. */
5291 /* Space for a branch around any trampolines. */
5296 /* Get a copy of the native relocations. */
5307 {
5319 {
5334 }
5336 /* Get the value of the symbol referred to by the reloc. */
5338 {
5339 /* A local symbol. */
5342 /* Read this BFD's local symbols. */
5344 {
5352 }
5360 else
5365 }
5366 else
5367 {
5368 /* Global symbol handling. */
5383 {
5387 {
5389 {
5392 }
5393 else
5394 {
5397 }
5398 }
5399 }
5401 ;
5404 {
5407 }
5408 else
5412 }
5414 /* If the branch and target are in the same section, you have
5415 no hope of adding stubs. We'll error out later should the
5416 branch overflow. */
5420 /* There probably isn't any reason to handle symbols in
5421 SEC_MERGE sections; SEC_MERGE doesn't seem a likely
5422 attribute for a code section, and we are only looking at
5423 branches. However, implement it correctly here as a
5424 reference for other target relax_section functions. */
5426 {
5427 /* At this stage in linking, no SEC_MERGE symbol has been
5428 adjusted, so all references to such symbols need to be
5429 passed through _bfd_merged_section_offset. (Later, in
5430 relocate_section, all SEC_MERGE symbols *except* for
5431 section symbols have been adjusted.)
5433 gas may reduce relocations against symbols in SEC_MERGE
5434 sections to a relocation against the section symbol when
5435 the original addend was zero. When the reloc is against
5436 a section symbol we should include the addend in the
5437 offset passed to _bfd_merged_section_offset, since the
5438 location of interest is the original symbol. On the
5439 other hand, an access to "sym+addend" where "sym" is not
5440 a section symbol should not include the addend; Such an
5441 access is presumed to be an offset from "sym"; The
5442 location of interest is just "sym". */
5448 toff);
5452 }
5453 /* PLTREL24 addends are special. */
5457 /* Attempted -shared link of non-pic code loses. */
5466 /* If the branch is in range, no need to do anything. */
5470 /* Look for an existing fixup to this address. */
5476 {
5482 /* Oh dear, we can't reach a trampoline. Don't try to add
5483 one. We'll report an error later. */
5487 {
5491 }
5492 else
5493 {
5497 }
5506 /* Hijack the old relocation. Since we need two
5507 relocations for this use a "composite" reloc. */
5509 stub_rtype);
5512 /* Record the fixup so we don't do it again this section. */
5521 }
5522 else
5523 {
5528 /* Nop out the reloc, since we're finalizing things here. */
5530 }
5532 /* Get the section contents. */
5534 {
5535 /* Get cached copy if it exists. */
5538 else
5539 {
5540 /* Go get them off disk. */
5543 }
5544 }
5546 /* Fix up the existing branch to hit the trampoline. */
5549 {
5567 }
5568 }
5570 /* Write out the trampolines. */
5573 {
5576 bfd_vma val;
5579 do
5580 {
5584 }
5592 /* Branch around the trampolines. */
5600 {
5603 }
5604 else
5605 {
5608 }
5612 {
5614 i++;
5618 }
5620 }
5624 {
5627 else
5628 {
5629 /* Cache the symbols for elf_link_input_bfd. */
5631 }
5632 }
5636 {
5639 else
5640 {
5641 /* Cache the section contents for elf_link_input_bfd. */
5643 }
5644 }
5647 {
5650 else
5652 }
5657 error_return:
5667 }
5668 \f
5669 /* What to do when ld finds relocations against symbols defined in
5670 discarded sections. */
5672 static unsigned int
5674 {
5682 }
5683 \f
5684 /* Fill in the address for a pointer generated in a linker section. */
5686 static bfd_vma
5690 bfd_vma relocation,
5692 {
5698 {
5699 /* Handle global symbol. */
5705 }
5706 else
5707 {
5708 /* Handle local symbol. */
5714 }
5718 lsect);
5721 /* Offset will always be a multiple of four, so use the bottom bit
5722 as a "written" flag. */
5724 {
5729 }
5735 #ifdef DEBUG
5739 #endif
5741 /* Subtract out the addend, because it will get added back in by the normal
5742 processing. */
5744 }
5746 /* The RELOCATE_SECTION function is called by the ELF backend linker
5747 to handle the relocations for a section.
5749 The relocs are always passed as Rela structures; if the section
5750 actually uses Rel structures, the r_addend field will always be
5751 zero.
5753 This function is responsible for adjust the section contents as
5754 necessary, and (if using Rela relocs and generating a
5755 relocatable output file) adjusting the reloc addend as
5756 necessary.
5758 This function does not have to worry about setting the reloc
5759 address or the reloc symbol index.
5761 LOCAL_SYMS is a pointer to the swapped in local symbols.
5763 LOCAL_SECTIONS is an array giving the section in the input file
5764 corresponding to the st_shndx field of each local symbol.
5766 The global hash table entry for the global symbols can be found
5767 via elf_sym_hashes (input_bfd).
5769 When generating relocatable output, this function must handle
5770 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
5771 going to be the section symbol corresponding to the output
5772 section, which means that the addend must be adjusted
5773 accordingly. */
5775 static bfd_boolean
5784 {
5790 Elf_Internal_Rela outrel;
5797 #ifdef DEBUG
5803 #endif
5807 /* Initialize howto table if not already done. */
5818 {
5820 bfd_vma addend;
5821 bfd_reloc_status_type r;
5828 bfd_vma relocation;
5830 bfd_boolean unresolved_reloc;
5831 bfd_boolean warned;
5843 {
5849 }
5850 else
5851 {
5858 }
5861 {
5862 /* For relocs against symbols from removed linkonce sections,
5863 or sections discarded by a linker script, we just want the
5864 section contents zeroed. Avoid any special processing. */
5872 }
5875 {
5879 {
5880 /* R_PPC_PLTREL24 is rather special. If non-zero, the
5881 addend specifies the GOT pointer offset within .got2. */
5883 }
5885 }
5887 /* TLS optimizations. Replace instruction sequences and relocs
5888 based on information we collected in tls_optimize. We edit
5889 RELOCS so that --emit-relocs will output something sensible
5890 for the final instruction stream. */
5894 {
5898 {
5902 }
5903 }
5905 /* Ensure reloc mapping code below stays sane. */
5916 {
5924 {
5925 bfd_vma insn;
5932 }
5938 {
5947 else
5950 /* add -> addi. */
5956 /* load and store indexed -> dform. */
5960 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
5965 /* lwax -> lwa. */
5967 else
5974 /* Was PPC_TLS which sits on insn boundary, now
5975 PPC_TPREL16_LO which is at low-order half-word. */
5977 }
5990 {
5991 tls_gdld_hi:
5995 else
5996 {
6000 }
6002 }
6015 {
6017 bfd_vma offset;
6019 tls_ldgd_opt:
6024 {
6025 /* IE */
6035 }
6036 else
6037 {
6038 /* LE */
6042 {
6043 /* Was an LD reloc. */
6046 }
6050 R_PPC_TPREL16_LO);
6053 }
6058 {
6059 /* We changed the symbol on an LD reloc. Start over
6060 in order to get h, sym, sec etc. right. */
6061 rel--;
6063 }
6064 }
6066 }
6068 /* Handle other relocations that tweak non-addend part of insn. */
6071 {
6075 /* Branch taken prediction relocations. */
6079 /* Fall thru */
6081 /* Branch not taken prediction relocations. */
6092 /* Invert 'y' bit if not the default. */
6098 }
6106 {
6123 /* GOT16 relocations. Like an ADDR16 using the symbol's
6124 address in the GOT as relocation value instead of the
6125 symbol's value itself. Also, create a GOT entry for the
6126 symbol and put the symbol value there. */
6159 dogot:
6160 {
6161 /* Relocation is to the entry for this symbol in the global
6162 offset table. */
6163 bfd_vma off;
6176 {
6177 bfd_boolean dyn;
6182 /* This is actually a static link, or it is a
6183 -Bsymbolic link and the symbol is defined
6184 locally, or the symbol was forced to be local
6185 because of a version file. */
6186 ;
6187 else
6188 {
6191 }
6193 }
6194 else
6195 {
6199 }
6201 /* The offset must always be a multiple of 4. We use the
6202 least significant bit to record whether we have already
6203 processed this entry. */
6207 else
6208 {
6219 /* We might have multiple got entries for this sym.
6220 Initialize them all. */
6221 do
6222 {
6226 {
6229 }
6231 {
6234 }
6236 {
6239 }
6241 {
6244 }
6246 /* Generate relocs for the dynamic linker. */
6251 {
6257 {
6260 {
6267 outrel.r_info
6269 }
6270 }
6277 else
6280 {
6284 }
6289 }
6291 /* Init the .got section contents if we're not
6292 emitting a reloc. */
6293 else
6294 {
6300 {
6306 {
6310 }
6311 }
6314 }
6319 }
6324 }
6330 {
6332 {
6338 {
6342 {
6345 }
6346 }
6347 }
6348 }
6353 /* Addends on got relocations don't make much sense.
6354 x+off@got is actually x@got+off, and since the got is
6355 generated by a hash table traversal, the value in the
6356 got at entry m+n bears little relation to the entry m. */
6360 input_bfd,
6361 input_section,
6364 sym_name);
6365 }
6368 /* Relocations that need no special processing. */
6370 /* It makes no sense to point a local relocation
6371 at a symbol not in this object. */
6373 {
6376 input_bfd,
6377 input_section,
6379 TRUE))
6382 }
6392 /* Relocations that may need to be propagated if this is a shared
6393 object. */
6399 /* The TPREL16 relocs shouldn't really be used in shared
6400 libs as they will result in DT_TEXTREL being set, but
6401 support them anyway. */
6426 /* fall through */
6441 /* If these relocations are not to a named symbol, they can be
6442 handled right here, no need to bother the dynamic linker. */
6446 /* fall through */
6454 /* fall through */
6456 dodyn:
6466 || (ELIMINATE_COPY_RELOCS
6472 {
6475 #ifdef DEBUG
6480 #endif
6482 /* When generating a shared object, these relocations
6483 are copied into the output file to be resolved at run
6484 time. */
6486 {
6489 name = (bfd_elf_string_from_elf_section
6498 input_section),
6503 }
6519 {
6523 }
6524 else
6525 {
6530 else
6531 {
6537 {
6540 }
6541 else
6542 {
6545 /* We are turning this relocation into one
6546 against a section symbol. It would be
6547 proper to subtract the symbol's value,
6548 osec->vma, from the emitted reloc addend,
6549 but ld.so expects buggy relocs. */
6553 {
6556 }
6558 #ifdef DEBUG
6563 #endif
6564 }
6567 }
6568 }
6577 /* This reloc will be computed at runtime. We clear the memory
6578 so that it contains predictable value. */
6582 {
6586 }
6587 }
6592 {
6599 else
6604 }
6607 /* Fall thru */
6613 /* Fall thru */
6616 relax32:
6617 {
6624 /* We're clearing the bits for R_PPC_ADDR16_HA
6625 and R_PPC_ADDR16_LO here. */
6629 /* t0 is HA, t1 is LO */
6636 }
6639 /* Indirect .sdata relocation. */
6642 relocation
6647 /* Indirect .sdata2 relocation. */
6650 relocation
6655 /* Handle the TOC16 reloc. We want to use the offset within the .got
6656 section, not the actual VMA. This is appropriate when generating
6657 an embedded ELF object, for which the .got section acts like the
6658 AIX .toc section. */
6669 /* Relocation is to the entry for this symbol in the
6670 procedure linkage table. */
6671 {
6677 {
6678 /* We didn't make a PLT entry for this symbol. This
6679 happens when statically linking PIC code, or when
6680 using -Bsymbolic. */
6682 }
6689 else
6693 }
6696 /* Relocate against _SDA_BASE_. */
6698 {
6708 {
6712 input_bfd,
6713 sym_name,
6715 name);
6716 }
6721 }
6724 /* Relocate against _SDA2_BASE_. */
6726 {
6734 {
6738 input_bfd,
6739 sym_name,
6741 name);
6746 }
6751 }
6754 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
6757 {
6768 {
6774 }
6778 {
6784 }
6788 {
6790 }
6792 else
6793 {
6797 input_bfd,
6798 sym_name,
6800 name);
6805 }
6812 }
6813 }
6816 /* Relocate against the beginning of the section. */
6825 /* Negative relocations. */
6851 input_bfd,
6853 sym_name);
6858 }
6860 /* Do any further special processing. */
6862 {
6873 /* It's just possible that this symbol is a weak symbol
6874 that's not actually defined anywhere. In that case,
6875 'sec' would be NULL, and we should leave the symbol
6876 alone (it will be set to zero elsewhere in the link). */
6879 /* Fall thru */
6887 /* Add 0x10000 if sign bit in 0:15 is set.
6888 Bits 0:15 are not used. */
6891 }
6893 #ifdef DEBUG
6898 sym_name,
6899 r_symndx,
6902 #endif
6907 {
6910 input_bfd,
6911 input_section,
6914 sym_name);
6916 }
6919 input_bfd,
6920 input_section,
6921 contents,
6923 relocation,
6924 addend);
6927 {
6929 {
6935 {
6936 /* Assume this is a call protected by other code that
6937 detect the symbol is undefined. If this is the case,
6938 we can safely ignore the overflow. If not, the
6939 program is hosed anyway, and a little warning isn't
6940 going to help. */
6943 }
6947 sym_name,
6950 input_bfd,
6951 input_section,
6954 }
6955 else
6956 {
6962 }
6963 }
6964 }
6966 #ifdef DEBUG
6968 #endif
6971 }
6972 \f
6973 #define PPC_LO(v) ((v) & 0xffff)
6974 #define PPC_HI(v) (((v) >> 16) & 0xffff)
6975 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
6977 /* Finish up dynamic symbol handling. We set the contents of various
6978 dynamic sections here. */
6980 static bfd_boolean
6985 {
6988 bfd_boolean doneone;
6990 #ifdef DEBUG
6993 #endif
7001 {
7003 {
7004 Elf_Internal_Rela rela;
7006 bfd_vma reloc_index;
7010 else
7011 {
7017 }
7019 /* This symbol has an entry in the procedure linkage table.
7020 Set it up. */
7022 {
7023 bfd_vma got_offset;
7026 /* The first three entries in .got.plt are reserved. */
7029 /* Use the right PLT. */
7033 /* Fill in the .plt on VxWorks. */
7035 {
7045 }
7046 else
7047 {
7048 bfd_vma got_loc
7049 = (got_offset
7062 }
7069 /* This instruction is an immediate load. The value loaded is
7070 the byte offset of the R_PPC_JMP_SLOT relocation from the
7071 start of the .rela.plt section. The value is stored in the
7072 low-order 16 bits of the load instruction. */
7073 /* NOTE: It appears that this is now an index rather than a
7074 prescaled offset. */
7078 /* This instruction is a PC-relative branch whose target is
7079 the start of the PLT section. The address of this branch
7080 instruction is 20 bytes beyond the start of this PLT entry.
7081 The address is encoded in bits 6-29, inclusive. The value
7082 stored is right-shifted by two bits, permitting a 26-bit
7083 offset. */
7093 /* Fill in the GOT entry corresponding to this PLT slot with
7094 the address immediately after the the "bctr" instruction
7095 in this PLT entry. */
7102 {
7103 /* Fill in a couple of entries in .rela.plt.unloaded. */
7109 /* Provide the @ha relocation for the first instruction. */
7114 R_PPC_ADDR16_HA);
7119 /* Provide the @l relocation for the second instruction. */
7124 R_PPC_ADDR16_LO);
7129 /* Provide a relocation for the GOT entry corresponding to this
7130 PLT slot. Point it at the middle of the .plt entry. */
7135 R_PPC_ADDR32);
7138 }
7140 /* VxWorks uses non-standard semantics for R_PPC_JMP_SLOT.
7141 In particular, the offset for the relocation is not the
7142 address of the PLT entry for this function, as specified
7143 by the ABI. Instead, the offset is set to the address of
7144 the GOT slot for this function. See EABI 4.4.4.1. */
7149 }
7150 else
7151 {
7156 {
7157 /* We don't need to fill in the .plt. The ppc dynamic
7158 linker will fill it in. */
7159 }
7160 else
7161 {
7167 }
7168 }
7170 /* Fill in the entry in the .rela.plt section. */
7179 {
7180 /* Mark the symbol as undefined, rather than as
7181 defined in the .plt section. Leave the value if
7182 there were any relocations where pointer equality
7183 matters (this is a clue for the dynamic linker, to
7184 make function pointer comparisons work between an
7185 application and shared library), otherwise set it
7186 to zero. */
7191 {
7192 /* This breaks function pointer comparisons, but
7193 that is better than breaking tests for a NULL
7194 function pointer. */
7196 }
7197 }
7199 }
7202 {
7203 bfd_vma plt;
7212 {
7227 {
7236 }
7237 else
7238 {
7247 }
7248 }
7249 else
7250 {
7260 /* We only need one non-PIC glink stub. */
7262 }
7263 }
7264 else
7266 }
7269 {
7271 Elf_Internal_Rela rela;
7274 /* This symbols needs a copy reloc. Set it up. */
7276 #ifdef DEBUG
7278 #endif
7284 else
7295 }
7297 #ifdef DEBUG
7299 #endif
7301 /* Mark some specially defined symbols as absolute. */
7310 }
7311 \f
7312 static enum elf_reloc_type_class
7314 {
7316 {
7327 }
7328 }
7329 \f
7330 /* Finish up the dynamic sections. */
7332 static bfd_boolean
7335 {
7339 bfd_vma got;
7342 #ifdef DEBUG
7344 #endif
7351 else
7361 {
7369 {
7370 Elf_Internal_Dyn dyn;
7376 {
7380 else
7400 {
7404 }
7412 }
7415 }
7416 }
7418 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
7419 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
7421 {
7423 bfd_vma val;
7435 }
7437 /* Fill in the first entry in the VxWorks procedure linkage table. */
7439 {
7440 /* Use the right PLT. */
7446 {
7447 bfd_vma got_value =
7457 }
7458 else
7459 {
7462 }
7471 {
7472 Elf_Internal_Rela rela;
7477 /* Output the @ha relocation for the first instruction. */
7486 /* Output the @l relocation for the second instruction. */
7495 /* Fix up the remaining relocations. They may have the wrong
7496 symbol index for _G_O_T_ or _P_L_T_ depending on the order
7497 in which symbols were output. */
7499 {
7500 Elf_Internal_Rela rel;
7516 }
7517 }
7518 }
7521 {
7524 bfd_vma res0;
7527 /*
7528 * PIC glink code is the following:
7529 *
7530 * # ith PLT code stub.
7531 * addis 11,30,(plt+(i-1)*4-got)@ha
7532 * lwz 11,(plt+(i-1)*4-got)@l(11)
7533 * mtctr 11
7534 * bctr
7535 *
7536 * # A table of branches, one for each plt entry.
7537 * # The idea is that the plt call stub loads ctr and r11 with these
7538 * # addresses, so (r11 - res_0) gives the plt index * 4.
7539 * res_0: b PLTresolve
7540 * res_1: b PLTresolve
7541 * .
7542 * # Some number of entries towards the end can be nops
7543 * res_n_m3: nop
7544 * res_n_m2: nop
7545 * res_n_m1:
7546 *
7547 * PLTresolve:
7548 * addis 11,11,(1f-res_0)@ha
7549 * mflr 0
7550 * bcl 20,31,1f
7551 * 1: addi 11,11,(1b-res_0)@l
7552 * mflr 12
7553 * mtlr 0
7554 * sub 11,11,12 # r11 = index * 4
7555 * addis 12,12,(got+4-1b)@ha
7556 * lwz 0,(got+4-1b)@l(12) # got[1] address of dl_runtime_resolve
7557 * lwz 12,(got+8-1b)@l(12) # got[2] contains the map address
7558 * mtctr 0
7559 * add 0,11,11
7560 * add 11,0,11 # r11 = index * 12 = reloc offset.
7561 * bctr
7562 */
7564 {
7565 ADDIS_11_11,
7566 MFLR_0,
7567 BCL_20_31,
7568 ADDI_11_11,
7569 MFLR_12,
7570 MTLR_0,
7571 SUB_11_11_12,
7572 ADDIS_12_12,
7573 LWZ_0_12,
7574 LWZ_12_12,
7575 MTCTR_0,
7576 ADD_0_11_11,
7577 ADD_11_0_11,
7578 BCTR,
7579 NOP,
7580 NOP
7581 };
7583 /*
7584 * Non-PIC glink code is a little simpler.
7585 *
7586 * # ith PLT code stub.
7587 * lis 11,(plt+(i-1)*4)@ha
7588 * lwz 11,(plt+(i-1)*4)@l(11)
7589 * mtctr 11
7590 * bctr
7591 *
7592 * The branch table is the same, then comes
7593 *
7594 * PLTresolve:
7595 * lis 12,(got+4)@ha
7596 * addis 11,11,(-res_0)@ha
7597 * lwz 0,(got+4)@l(12) # got[1] address of dl_runtime_resolve
7598 * addi 11,11,(-res_0)@l # r11 = index * 4
7599 * mtctr 0
7600 * add 0,11,11
7601 * lwz 12,(got+8)@l(12) # got[2] contains the map address
7602 * add 11,0,11 # r11 = index * 12 = reloc offset.
7603 * bctr
7604 */
7606 {
7607 LIS_12,
7608 ADDIS_11_11,
7609 LWZ_0_12,
7610 ADDI_11_11,
7611 MTCTR_0,
7612 ADD_0_11_11,
7613 LWZ_12_12,
7614 ADD_11_0_11,
7615 BCTR,
7616 NOP,
7617 NOP,
7618 NOP,
7619 NOP,
7620 NOP,
7621 NOP,
7622 NOP
7623 };
7630 /* Build the branch table, one for each plt entry (less one),
7631 and perhaps some padding. */
7637 {
7640 }
7642 {
7645 }
7651 /* Last comes the PLTresolve stub. */
7653 {
7654 bfd_vma bcl;
7657 {
7660 }
7674 {
7679 }
7680 else
7681 {
7686 }
7687 }
7688 else
7689 {
7691 {
7694 }
7704 {
7709 }
7710 else
7711 {
7716 }
7717 }
7718 }
7721 }
7722 \f
7723 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
7725 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
7727 #define ELF_ARCH bfd_arch_powerpc
7728 #define ELF_MACHINE_CODE EM_PPC
7729 #ifdef __QNXTARGET__
7730 #define ELF_MAXPAGESIZE 0x1000
7731 #else
7732 #define ELF_MAXPAGESIZE 0x10000
7733 #endif
7734 #define ELF_MINPAGESIZE 0x1000
7735 #define ELF_COMMONPAGESIZE 0x1000
7736 #define elf_info_to_howto ppc_elf_info_to_howto
7738 #ifdef EM_CYGNUS_POWERPC
7739 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
7740 #endif
7742 #ifdef EM_PPC_OLD
7743 #define ELF_MACHINE_ALT2 EM_PPC_OLD
7744 #endif
7746 #define elf_backend_plt_not_loaded 1
7747 #define elf_backend_can_gc_sections 1
7748 #define elf_backend_can_refcount 1
7749 #define elf_backend_rela_normal 1
7751 #define bfd_elf32_mkobject ppc_elf_mkobject
7752 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
7753 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
7754 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
7755 #define bfd_elf32_bfd_reloc_name_lookup ppc_elf_reloc_name_lookup
7756 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
7757 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create
7759 #define elf_backend_object_p ppc_elf_object_p
7760 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
7761 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
7762 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
7763 #define elf_backend_relocate_section ppc_elf_relocate_section
7764 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
7765 #define elf_backend_check_relocs ppc_elf_check_relocs
7766 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol
7767 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
7768 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
7769 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
7770 #define elf_backend_hash_symbol ppc_elf_hash_symbol
7771 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
7772 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
7773 #define elf_backend_fake_sections ppc_elf_fake_sections
7774 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
7775 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
7776 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
7777 #define elf_backend_write_core_note ppc_elf_write_core_note
7778 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
7779 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing
7780 #define elf_backend_final_write_processing ppc_elf_final_write_processing
7781 #define elf_backend_write_section ppc_elf_write_section
7782 #define elf_backend_get_sec_type_attr ppc_elf_get_sec_type_attr
7783 #define elf_backend_plt_sym_val ppc_elf_plt_sym_val
7784 #define elf_backend_action_discarded ppc_elf_action_discarded
7785 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
7789 /* VxWorks Target */
7791 #undef TARGET_LITTLE_SYM
7792 #undef TARGET_LITTLE_NAME
7794 #undef TARGET_BIG_SYM
7795 #define TARGET_BIG_SYM bfd_elf32_powerpc_vxworks_vec
7796 #undef TARGET_BIG_NAME
7799 /* VxWorks uses the elf default section flags for .plt. */
7802 {
7810 }
7812 /* Like ppc_elf_link_hash_table_create, but overrides
7813 appropriately for VxWorks. */
7816 {
7821 {
7829 }
7831 }
7833 /* Tweak magic VxWorks symbols as they are loaded. */
7834 static bfd_boolean
7842 {
7844 valp))
7848 }
7850 static void
7852 {
7855 }
7857 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
7858 define it. */
7859 #undef elf_backend_want_plt_sym
7860 #define elf_backend_want_plt_sym 1
7861 #undef elf_backend_want_got_plt
7862 #define elf_backend_want_got_plt 1
7863 #undef elf_backend_got_symbol_offset
7864 #define elf_backend_got_symbol_offset 0
7865 #undef elf_backend_plt_not_loaded
7866 #define elf_backend_plt_not_loaded 0
7867 #undef elf_backend_plt_readonly
7868 #define elf_backend_plt_readonly 1
7869 #undef elf_backend_got_header_size
7870 #define elf_backend_got_header_size 12
7872 #undef bfd_elf32_bfd_link_hash_table_create
7873 #define bfd_elf32_bfd_link_hash_table_create \
7874 ppc_elf_vxworks_link_hash_table_create
7875 #undef elf_backend_add_symbol_hook
7876 #define elf_backend_add_symbol_hook \
7877 ppc_elf_vxworks_add_symbol_hook
7878 #undef elf_backend_link_output_symbol_hook
7879 #define elf_backend_link_output_symbol_hook \
7880 elf_vxworks_link_output_symbol_hook
7881 #undef elf_backend_final_write_processing
7882 #define elf_backend_final_write_processing \
7883 ppc_elf_vxworks_final_write_processing
7884 #undef elf_backend_get_sec_type_attr
7885 #define elf_backend_get_sec_type_attr \
7886 ppc_elf_vxworks_get_sec_type_attr
7887 #undef elf_backend_emit_relocs
7888 #define elf_backend_emit_relocs \
7889 elf_vxworks_emit_relocs
7891 #undef elf32_bed
7892 #define elf32_bed ppc_elf_vxworks_bed