| blob | 0ad117579092e170d01b9bbc3e24537a400d5ac9 |
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 static bfd_boolean
2296 {
2301 }
2303 static long
2307 {
2312 bfd_vma stub_vma;
2336 /* Call common code to handle old-style executable PLTs. */
2341 /* If this object was prelinked, the prelinker stored the address
2342 of .glink at got[1]. If it wasn't prelinked, got[1] will be zero. */
2345 {
2359 {
2360 Elf_Internal_Dyn dyn;
2367 {
2375 }
2376 }
2378 }
2380 /* Otherwise we read the first plt entry. */
2382 {
2385 }
2390 /* The .glink section usually does not survive the final
2391 link; search for the section (usually .text) where the
2392 glink stubs now reside. */
2397 /* Determine glink PLT resolver by reading the relative branch
2398 from the first glink stub. */
2401 {
2404 /* The first glink stub may either branch to the resolver ... */
2409 /* ... or fall through a bunch of NOPs. */
2416 {
2419 }
2420 }
2445 {
2449 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
2450 we are defining a symbol, ensure one of them is set. */
2465 }
2467 /* Add a symbol at the start of the glink branch table. */
2476 s++;
2477 count++;
2480 {
2481 /* Add a symbol for the glink PLT resolver. */
2490 s++;
2491 count++;
2492 }
2495 }
2496 \f
2497 /* The following functions are specific to the ELF linker, while
2498 functions above are used generally. They appear in this file more
2499 or less in the order in which they are called. eg.
2500 ppc_elf_check_relocs is called early in the link process,
2501 ppc_elf_finish_dynamic_sections is one of the last functions
2502 called. */
2504 /* The PPC linker needs to keep track of the number of relocs that it
2505 decides to copy as dynamic relocs in check_relocs for each symbol.
2506 This is so that it can later discard them if they are found to be
2507 unnecessary. We store the information in a field extending the
2508 regular ELF linker hash table. */
2510 struct ppc_elf_dyn_relocs
2511 {
2514 /* The input section of the reloc. */
2517 /* Total number of relocs copied for the input section. */
2518 bfd_size_type count;
2520 /* Number of pc-relative relocs copied for the input section. */
2521 bfd_size_type pc_count;
2522 };
2524 /* Track PLT entries needed for a given symbol. We might need more
2525 than one glink entry per symbol. */
2526 struct plt_entry
2527 {
2530 /* -fPIC uses multiple GOT sections, one per file, called ".got2".
2531 This field stores the offset into .got2 used to initialise the
2532 GOT pointer reg. It will always be at least 32768 (and for
2533 current gcc this is the only offset used). */
2534 bfd_vma addend;
2536 /* The .got2 section. */
2539 /* PLT refcount or offset. */
2540 union
2541 {
2542 bfd_signed_vma refcount;
2543 bfd_vma offset;
2546 /* .glink stub offset. */
2547 bfd_vma glink_offset;
2548 };
2550 /* Of those relocs that might be copied as dynamic relocs, this function
2551 selects those that must be copied when linking a shared library,
2552 even when the symbol is local. */
2554 static int
2557 {
2559 {
2576 }
2577 }
2579 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
2580 copying dynamic variables from a shared lib into an app's dynbss
2581 section, and instead use a dynamic relocation to point into the
2582 shared lib. */
2583 #define ELIMINATE_COPY_RELOCS 1
2585 /* PPC ELF linker hash entry. */
2587 struct ppc_elf_link_hash_entry
2588 {
2591 /* If this symbol is used in the linker created sections, the processor
2592 specific backend uses this field to map the field into the offset
2593 from the beginning of the section. */
2596 /* Track dynamic relocs copied for this symbol. */
2599 /* Contexts in which symbol is used in the GOT (or TOC).
2600 TLS_GD .. TLS_TLS bits are or'd into the mask as the
2601 corresponding relocs are encountered during check_relocs.
2602 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
2603 indicate the corresponding GOT entry type is not needed. */
2612 /* Nonzero if we have seen a small data relocation referring to this
2613 symbol. */
2615 };
2617 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent))
2619 /* PPC ELF linker hash table. */
2621 struct ppc_elf_link_hash_table
2622 {
2625 /* Short-cuts to get to dynamic linker sections. */
2638 /* The (unloaded but important) .rela.plt.unloaded on VxWorks. */
2641 /* The .got.plt section (VxWorks only)*/
2644 /* Shortcut to __tls_get_addr. */
2647 /* The bfd that forced an old-style PLT. */
2650 /* TLS local dynamic got entry handling. */
2652 bfd_signed_vma refcount;
2653 bfd_vma offset;
2656 /* Offset of PltResolve function in glink. */
2657 bfd_vma glink_pltresolve;
2659 /* Size of reserved GOT entries. */
2661 /* Non-zero if allocating the header left a gap. */
2664 /* The type of PLT we have chosen to use. */
2667 /* Set if we should emit symbols for stubs. */
2670 /* True if the target system is VxWorks. */
2673 /* The size of PLT entries. */
2675 /* The distance between adjacent PLT slots. */
2677 /* The size of the first PLT entry. */
2680 /* Small local sym to section mapping cache. */
2682 };
2684 /* Get the PPC ELF linker hash table from a link_info structure. */
2686 #define ppc_elf_hash_table(p) \
2687 ((struct ppc_elf_link_hash_table *) (p)->hash)
2689 /* Create an entry in a PPC ELF linker hash table. */
2695 {
2696 /* Allocate the structure if it has not already been allocated by a
2697 subclass. */
2699 {
2704 }
2706 /* Call the allocation method of the superclass. */
2709 {
2713 }
2716 }
2718 /* Create a PPC ELF linker hash table. */
2722 {
2730 ppc_elf_link_hash_newfunc,
2732 {
2735 }
2755 }
2757 /* Create .got and the related sections. */
2759 static bfd_boolean
2761 {
2764 flagword flags;
2775 {
2779 }
2780 else
2781 {
2782 /* The powerpc .got has a blrl instruction in it. Mark it
2783 executable. */
2788 }
2798 }
2800 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2801 to output sections (just like _bfd_elf_create_dynamic_sections has
2802 to create .dynbss and .rela.bss). */
2804 static bfd_boolean
2806 {
2809 flagword flags;
2837 {
2844 }
2857 /* The VxWorks PLT is a loaded section with contents. */
2860 }
2862 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2864 static void
2868 {
2875 {
2877 {
2881 /* Add reloc counts against the indirect sym to the direct sym
2882 list. Merge any entries against the same section. */
2884 {
2889 {
2894 }
2897 }
2899 }
2903 }
2908 /* If called to transfer flags for a weakdef during processing
2909 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
2910 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
2922 /* If we were called to copy over info for a weak sym, that's all. */
2926 /* Copy over the GOT refcount entries that we may have already seen to
2927 the symbol which just became indirect. */
2931 /* And plt entries. */
2933 {
2935 {
2940 {
2945 {
2949 }
2952 }
2954 }
2958 }
2961 {
2969 }
2970 }
2972 /* Hook called by the linker routine which adds symbols from an object
2973 file. We use it to put .comm items in .sbss, and not .bss. */
2975 static bfd_boolean
2983 {
2988 {
2989 /* Common symbols less than or equal to -G nn bytes are automatically
2990 put into .sbss. */
2995 {
3003 flags);
3006 }
3010 }
3013 }
3014 \f
3015 static bfd_boolean
3018 {
3027 }
3029 /* Create a special linker section. */
3031 static bfd_boolean
3034 flagword flags,
3036 {
3043 /* Record the first bfd that needs the special sections. */
3049 flags);
3056 }
3058 /* Find a linker generated pointer with a given addend and type. */
3061 elf_find_pointer_linker_section
3063 bfd_vma addend,
3065 {
3071 }
3073 /* Allocate a pointer to live in a linker created section. */
3075 static bfd_boolean
3080 {
3084 bfd_size_type amt;
3088 /* Is this a global symbol? */
3090 {
3093 /* Has this symbol already been allocated? If so, our work is done. */
3097 lsect))
3101 }
3102 else
3103 {
3106 /* Allocation of a pointer to a local symbol. */
3109 /* Allocate a table to hold the local symbols if first time. */
3111 {
3122 }
3124 /* Has this symbol already been allocated? If so, our work is done. */
3127 lsect))
3131 }
3133 /* Allocate space for a pointer in the linker section, and allocate
3134 a new pointer record from internal memory. */
3150 #ifdef DEBUG
3155 #endif
3158 }
3160 static bfd_boolean
3165 {
3170 {
3178 }
3184 }
3186 static bfd_boolean
3189 {
3198 {
3208 }
3211 }
3215 {
3224 }
3226 static void
3228 {
3231 abfd,
3234 }
3236 /* Look through the relocs for a section during the first phase, and
3237 allocate space in the global offset table or procedure linkage
3238 table. */
3240 static bfd_boolean
3245 {
3256 /* Don't do anything special with non-loaded, non-alloced sections.
3257 In particular, any relocs in such sections should not affect GOT
3258 and PLT reference counting (ie. we don't allow them to create GOT
3259 or PLT entries), there's no possibility or desire to optimize TLS
3260 relocs, and there's not much point in propagating relocs to shared
3261 libs that the dynamic linker won't relocate. */
3265 #ifdef DEBUG
3268 #endif
3272 /* Initialize howto table if not already done. */
3284 {
3293 else
3294 {
3299 }
3301 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
3302 This shows up in particular in an R_PPC_ADDR32 in the eabi
3303 startup code. */
3307 {
3313 }
3317 {
3346 dogottls:
3348 /* Fall thru */
3350 /* GOT16 relocations */
3355 /* This symbol requires a global offset table entry. */
3357 {
3362 }
3364 {
3367 }
3368 else
3369 /* This is a global offset table entry for a local symbol. */
3374 /* Indirect .sdata relocation. */
3377 {
3380 }
3389 {
3392 }
3395 /* Indirect .sdata2 relocation. */
3398 {
3401 }
3410 {
3413 }
3418 {
3421 }
3426 {
3429 }
3434 {
3437 }
3442 {
3445 }
3451 {
3454 }
3462 {
3465 }
3474 {
3477 }
3488 #ifdef DEBUG
3490 #endif
3491 /* This symbol requires a procedure linkage table entry. We
3492 actually build the entry in finish_dynamic_symbol,
3493 because this might be a case of linking PIC code without
3494 linking in any dynamic objects, in which case we don't
3495 need to generate a procedure linkage table after all. */
3498 {
3499 /* It does not make sense to have a procedure linkage
3500 table entry for a local symbol. */
3503 abfd,
3504 sec,
3509 }
3510 else
3511 {
3515 {
3518 }
3522 }
3525 /* The following relocations don't need to propagate the
3526 relocation if linking a shared object since they are
3527 section relative. */
3546 /* These are just markers. */
3553 /* These should only appear in dynamic objects. */
3560 /* These aren't handled yet. We'll report an error later. */
3569 /* This refers only to functions defined in the shared library. */
3572 {
3575 }
3578 /* This relocation describes the C++ object vtable hierarchy.
3579 Reconstruct it for later use during GC. */
3585 /* This relocation describes which C++ vtable entries are actually
3586 used. Record for later use during GC. */
3594 /* We shouldn't really be seeing these. */
3604 /* Nor these. */
3615 {
3616 /* Old -fPIC gcc code has .long LCTOC1-LCFx just before
3617 the start of a function, which assembles to a REL32
3618 reference to .got2. If we detect one of these, then
3619 force the old PLT layout because the linker cannot
3620 reliably deduce the GOT pointer value needed for
3621 PLT call stubs. */
3625 r_symndx);
3627 {
3630 }
3631 }
3634 /* fall through */
3644 {
3645 /* We may need a plt entry if the symbol turns out to be
3646 a function defined in a dynamic object. */
3650 /* We may need a copy reloc too. */
3653 }
3663 {
3665 {
3668 }
3670 }
3671 /* fall through */
3678 {
3679 /* We may need a plt entry if the symbol turns out to be
3680 a function defined in a dynamic object. */
3684 }
3686 dodyn:
3687 /* If we are creating a shared library, and this is a reloc
3688 against a global symbol, or a non PC relative reloc
3689 against a local symbol, then we need to copy the reloc
3690 into the shared library. However, if we are linking with
3691 -Bsymbolic, we do not need to copy a reloc against a
3692 global symbol which is defined in an object we are
3693 including in the link (i.e., DEF_REGULAR is set). At
3694 this point we have not seen all the input files, so it is
3695 possible that DEF_REGULAR is not set now but will be set
3696 later (it is never cleared). In case of a weak definition,
3697 DEF_REGULAR may be cleared later by a strong definition in
3698 a shared library. We account for that possibility below by
3699 storing information in the dyn_relocs field of the hash
3700 table entry. A similar situation occurs when creating
3701 shared libraries and symbol visibility changes render the
3702 symbol local.
3704 If on the other hand, we are creating an executable, we
3705 may need to keep relocations for symbols satisfied by a
3706 dynamic library if we manage to avoid copy relocs for the
3707 symbol. */
3714 || (ELIMINATE_COPY_RELOCS
3719 {
3723 #ifdef DEBUG
3725 "ppc_elf_check_relocs needs to "
3729 #endif
3731 {
3734 name = (bfd_elf_string_from_elf_section
3749 {
3750 flagword flags;
3756 name,
3757 flags);
3762 }
3764 }
3766 /* If this is a global symbol, we count the number of
3767 relocations we need for this symbol. */
3769 {
3771 }
3772 else
3773 {
3774 /* Track dynamic relocs needed for local syms too.
3775 We really need local syms available to do this
3776 easily. Oh well. */
3788 }
3792 {
3801 }
3806 }
3809 }
3810 }
3813 }
3814 \f
3816 /* Merge object attributes from IBFD into OBFD. Raise an error if
3817 there are conflicting attributes. */
3818 static bfd_boolean
3820 {
3825 {
3826 /* This is the first object. Copy the attributes. */
3829 /* Use the Tag_null value to indicate the attributes have been
3830 initialized. */
3834 }
3839 /* Check for conflicting Tag_GNU_Power_ABI_FP attributes and merge
3840 non-conflicting ones. */
3844 {
3849 ;
3851 _bfd_error_handler
3854 _bfd_error_handler
3857 _bfd_error_handler
3860 else
3861 _bfd_error_handler
3864 }
3866 /* Check for conflicting Tag_GNU_Power_ABI_Vector attributes and
3867 merge non-conflicting ones. */
3871 {
3875 {
3879 }
3882 {
3886 }
3892 ;
3893 /* For now, allow generic to transition to AltiVec or SPE
3894 without a warning. If GCC marked files with their stack
3895 alignment and used don't-care markings for files which are
3896 not affected by the vector ABI, we could warn about this
3897 case too. */
3901 ;
3903 _bfd_error_handler
3907 _bfd_error_handler
3910 else
3911 _bfd_error_handler
3914 }
3916 /* Merge Tag_compatibility attributes and any common GNU ones. */
3920 }
3922 /* Merge backend specific data from an object file to the output
3923 object file when linking. */
3925 static bfd_boolean
3927 {
3928 flagword old_flags;
3929 flagword new_flags;
3930 bfd_boolean error;
3935 /* Check if we have the same endianess. */
3945 {
3946 /* First call, no flags set. */
3949 }
3951 /* Compatible flags are ok. */
3953 ;
3955 /* Incompatible flags. */
3956 else
3957 {
3958 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
3959 to be linked with either. */
3963 {
3968 }
3971 {
3976 }
3978 /* The output is -mrelocatable-lib iff both the input files are. */
3982 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
3983 but each input file is either -mrelocatable or -mrelocatable-lib. */
3989 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
3990 any module uses it. */
3996 /* Warn about any other mismatches. */
3998 {
4004 }
4007 {
4010 }
4011 }
4014 }
4015 \f
4016 /* Choose which PLT scheme to use, and set .plt flags appropriately.
4017 Returns -1 on error, 0 for old PLT, 1 for new PLT. */
4018 int
4023 {
4025 flagword flags;
4030 {
4033 else
4034 {
4038 /* Look through the reloc flags left by ppc_elf_check_relocs.
4039 Use the old style bss plt if a file makes plt calls
4040 without using the new relocs, and if ld isn't given
4041 --secure-plt and we never see REL16 relocs. */
4046 {
4050 {
4054 }
4055 }
4057 }
4058 }
4067 {
4071 /* The new PLT is a loaded section. */
4076 /* The new GOT is not executable. */
4080 }
4081 else
4082 {
4083 /* Stop an unused .glink section from affecting .text alignment. */
4087 }
4089 }
4090 \f
4091 /* Return the section that should be marked against GC for a given
4092 relocation. */
4100 {
4103 {
4107 }
4110 }
4112 /* Update the got, plt and dynamic reloc reference counts for the
4113 section being removed. */
4115 static bfd_boolean
4120 {
4144 {
4151 {
4163 {
4164 /* Everything must go for SEC. */
4167 }
4168 }
4172 {
4194 {
4197 }
4199 {
4202 }
4212 /* Fall thru */
4235 {
4240 }
4245 }
4246 }
4248 }
4249 \f
4250 /* Set htab->tls_get_addr and call the generic ELF tls_setup function. */
4252 asection *
4254 {
4261 {
4264 }
4269 }
4271 /* Run through all the TLS relocs looking for optimization
4272 opportunities. */
4274 bfd_boolean
4277 {
4287 /* Make two passes through the relocs. First time check that tls
4288 relocs involved in setting up a tls_get_addr call are indeed
4289 followed by such a call. If they are not, exclude them from
4290 the optimizations done on the second pass. */
4293 {
4299 {
4302 /* Read the relocations. */
4310 {
4316 bfd_boolean is_local;
4322 {
4330 }
4340 {
4344 /* Fall thru */
4348 /* These relocs should never be against a symbol
4349 defined in a shared lib. Leave them alone if
4350 that turns out to be the case. */
4354 /* LD -> LE */
4362 /* Fall thru */
4367 /* GD -> LE */
4369 else
4370 /* GD -> IE */
4380 {
4381 /* IE -> LE */
4385 }
4386 else
4391 }
4394 {
4399 {
4404 /* The next instruction should be a call to
4405 __tls_get_addr. Peek at the reloc to be sure. */
4414 {
4425 }
4426 }
4428 /* Uh oh, we didn't find the expected call. We
4429 could just mark this symbol to exclude it
4430 from tls optimization but it's safer to skip
4431 the entire section. */
4434 }
4437 {
4440 }
4441 else
4442 {
4448 {
4455 {
4459 }
4460 }
4468 }
4471 {
4472 /* We managed to get rid of a got entry. */
4475 }
4478 {
4484 }
4488 }
4492 }
4496 {
4499 else
4501 }
4502 }
4504 }
4505 \f
4506 /* Return true if we have dynamic relocs that apply to read-only sections. */
4508 static bfd_boolean
4510 {
4514 {
4521 }
4523 }
4525 /* Adjust a symbol defined by a dynamic object and referenced by a
4526 regular object. The current definition is in some section of the
4527 dynamic object, but we're not including those sections. We have to
4528 change the definition to something the rest of the link can
4529 understand. */
4531 static bfd_boolean
4534 {
4538 #ifdef DEBUG
4541 #endif
4543 /* Make sure we know what is going on here. */
4552 /* Deal with function syms. */
4555 {
4556 /* Clear procedure linkage table information for any symbol that
4557 won't need a .plt entry. */
4566 {
4567 /* A PLT entry is not required/allowed when:
4569 1. We are not using ld.so; because then the PLT entry
4570 can't be set up, so we can't use one. In this case,
4571 ppc_elf_adjust_dynamic_symbol won't even be called.
4573 2. GC has rendered the entry unused.
4575 3. We know for certain that a call to this symbol
4576 will go to this object, or will remain undefined. */
4579 }
4580 else
4581 {
4582 /* After adjust_dynamic_symbol, non_got_ref set means that
4583 dyn_relocs for this symbol should be discarded.
4584 If we get here we know we are making a PLT entry for this
4585 symbol, and in an executable we'd normally resolve
4586 relocations against this symbol to the PLT entry. Allow
4587 dynamic relocs if the reference is weak, and the dynamic
4588 relocs will not cause text relocation. */
4595 }
4597 }
4598 else
4601 /* If this is a weak symbol, and there is a real definition, the
4602 processor independent code will have arranged for us to see the
4603 real definition first, and we can just use the same value. */
4605 {
4613 }
4615 /* This is a reference to a symbol defined by a dynamic object which
4616 is not a function. */
4618 /* If we are creating a shared library, we must presume that the
4619 only references to the symbol are via the global offset table.
4620 For such cases we need not do anything here; the relocations will
4621 be handled correctly by relocate_section. */
4625 /* If there are no references to this symbol that do not use the
4626 GOT, we don't need to generate a copy reloc. */
4630 /* If we didn't find any dynamic relocs in read-only sections, then
4631 we'll be keeping the dynamic relocs and avoiding the copy reloc.
4632 We can't do this if there are any small data relocations. This
4633 doesn't work on VxWorks, where we can not have dynamic
4634 relocations (other than copy and jump slot relocations) in an
4635 executable. */
4641 {
4644 }
4647 {
4651 }
4653 /* We must allocate the symbol in our .dynbss section, which will
4654 become part of the .bss section of the executable. There will be
4655 an entry for this symbol in the .dynsym section. The dynamic
4656 object will contain position independent code, so all references
4657 from the dynamic object to this symbol will go through the global
4658 offset table. The dynamic linker will use the .dynsym entry to
4659 determine the address it must put in the global offset table, so
4660 both the dynamic object and the regular object will refer to the
4661 same memory location for the variable.
4663 Of course, if the symbol is referenced using SDAREL relocs, we
4664 must instead allocate it in .sbss. */
4668 else
4672 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
4673 copy the initial value out of the dynamic object and into the
4674 runtime process image. We need to remember the offset into the
4675 .rela.bss section we are going to use. */
4677 {
4682 else
4687 }
4690 }
4691 \f
4692 /* Generate a symbol to mark plt call stubs. For non-PIC code the sym is
4693 xxxxxxxx.plt_call32.<callee> where xxxxxxxx is a hex number, usually 0,
4694 specifying the addend on the plt relocation. For -fpic code, the sym
4695 is xxxxxxxx.plt_pic32.<callee>, and for -fPIC
4696 xxxxxxxx.got2.plt_pic32.<callee>. */
4698 static bfd_boolean
4702 {
4711 else
4731 {
4740 }
4742 }
4744 /* Allocate NEED contiguous space in .got, and return the offset.
4745 Handles allocation of the got header when crossing 32k. */
4747 static bfd_vma
4749 {
4750 bfd_vma where;
4754 {
4757 }
4758 else
4759 {
4762 {
4765 }
4766 else
4767 {
4770 {
4773 }
4776 }
4777 }
4779 }
4781 /* Allocate space in associated reloc sections for dynamic relocs. */
4783 static bfd_boolean
4785 {
4795 /* When warning symbols are created, they **replace** the "real"
4796 entry in the hash table, thus we never get to see the real
4797 symbol in a hash traversal. So look at it now. */
4802 {
4809 {
4810 /* Make sure this symbol is output as a dynamic symbol. */
4813 {
4816 }
4820 {
4824 {
4826 {
4829 }
4834 {
4837 }
4842 {
4845 }
4851 }
4852 else
4853 {
4855 {
4856 /* If this is the first .plt entry, make room
4857 for the special first entry. */
4861 /* The PowerPC PLT is actually composed of two
4862 parts, the first part is 2 words (for a load
4863 and a jump), and then there is a remaining
4864 word available at the end. */
4871 /* If this symbol is not defined in a regular
4872 file, and we are not generating a shared
4873 library, then set the symbol to this location
4874 in the .plt. This is required to make
4875 function pointers compare as equal between
4876 the normal executable and the shared library. */
4880 {
4883 }
4885 /* Make room for this entry. */
4887 /* After the 8192nd entry, room for two entries
4888 is allocated. */
4894 }
4896 }
4898 /* We also need to make an entry in the .rela.plt section. */
4900 {
4904 {
4905 /* Allocate space for the unloaded relocations. */
4907 {
4910 {
4914 }
4919 }
4921 /* Every PLT entry has an associated GOT entry in
4922 .got.plt. */
4924 }
4926 }
4927 }
4928 else
4930 }
4931 else
4935 {
4938 }
4939 }
4940 else
4941 {
4944 }
4948 {
4949 /* Make sure this symbol is output as a dynamic symbol. */
4952 {
4955 }
4959 {
4960 /* If just an LD reloc, we'll just use htab->tlsld_got.offset. */
4963 }
4964 else
4965 {
4966 bfd_boolean dyn;
4969 {
4978 }
4979 else
4987 {
4988 /* All the entries we allocated need relocs.
4989 Except LD only needs one. */
4993 }
4994 }
4995 }
4996 else
5002 /* In the shared -Bsymbolic case, discard space allocated for
5003 dynamic pc-relative relocs against symbols which turn out to be
5004 defined in regular objects. For the normal shared case, discard
5005 space for relocs that have become local due to symbol visibility
5006 changes. */
5009 {
5010 /* Relocs that use pc_count are those that appear on a call insn,
5011 or certain REL relocs (see must_be_dyn_reloc) that can be
5012 generated via assembly. We want calls to protected symbols to
5013 resolve directly to the function rather than going via the plt.
5014 If people want function pointer comparisons to work as expected
5015 then they should avoid writing weird assembly. */
5017 {
5021 {
5026 else
5028 }
5029 }
5032 {
5036 {
5039 else
5041 }
5042 }
5044 /* Discard relocs on undefined symbols that must be local. */
5051 /* Also discard relocs on undefined weak syms with non-default
5052 visibility. */
5055 {
5059 /* Make sure undefined weak symbols are output as a dynamic
5060 symbol in PIEs. */
5063 {
5066 }
5067 }
5068 }
5070 {
5071 /* For the non-shared case, discard space for relocs against
5072 symbols which turn out to need copy relocs or are not
5073 dynamic. */
5077 {
5078 /* Make sure this symbol is output as a dynamic symbol.
5079 Undefined weak syms won't yet be marked as dynamic. */
5082 {
5085 }
5087 /* If that succeeded, we know we'll be keeping all the
5088 relocs. */
5091 }
5095 keep: ;
5096 }
5098 /* Finally, allocate space. */
5100 {
5103 }
5106 }
5108 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
5109 read-only sections. */
5111 static bfd_boolean
5113 {
5121 {
5124 /* Not an error, just cut short the traversal. */
5126 }
5128 }
5130 /* Set the sizes of the dynamic sections. */
5132 static bfd_boolean
5135 {
5138 bfd_boolean relocs;
5141 #ifdef DEBUG
5143 #endif
5149 {
5150 /* Set the contents of the .interp section to the interpreter. */
5152 {
5157 }
5158 }
5165 /* Set up .got offsets for local syms, and space for local dynamic
5166 relocs. */
5168 {
5172 bfd_size_type locsymcount;
5179 {
5186 {
5189 {
5190 /* Input section has been discarded, either because
5191 it is a copy of a linkonce section or due to
5192 linker script /DISCARD/, so we'll be discarding
5193 the relocs too. */
5194 }
5198 {
5199 /* Relocations in vxworks .tls_vars sections are
5200 handled specially by the loader. */
5201 }
5203 {
5210 }
5211 }
5212 }
5224 {
5226 {
5227 /* If just an LD reloc, we'll just use
5228 htab->tlsld_got.offset. */
5231 }
5232 else
5233 {
5236 {
5243 }
5244 else
5250 }
5251 }
5252 else
5254 }
5256 /* Allocate space for global sym dynamic relocs. */
5260 {
5264 }
5265 else
5269 {
5272 /* If we haven't allocated the header, do so now. When we get here,
5273 for old plt/got the got size will be 0 to 32764 (not allocated),
5274 or 32780 to 65536 (header allocated). For new plt/got, the
5275 corresponding ranges are 0 to 32768 and 32780 to 65536. */
5277 {
5282 }
5285 }
5288 {
5290 /* Space for the branch table. */
5292 /* Pad out to align the start of PLTresolve. */
5297 {
5304 {
5313 }
5319 {
5328 }
5329 }
5330 }
5332 /* We've now determined the sizes of the various dynamic sections.
5333 Allocate memory for them. */
5336 {
5349 {
5350 /* We'd like to strip these sections if they aren't needed, but if
5351 we've exported dynamic symbols from them we must leave them.
5352 It's too late to tell BFD to get rid of the symbols. */
5355 /* Strip this section if we don't need it; see the
5356 comment below. */
5357 }
5360 {
5361 /* Strip these too. */
5362 }
5364 {
5366 {
5367 /* Remember whether there are any relocation sections. */
5370 /* We use the reloc_count field as a counter if we need
5371 to copy relocs into the output file. */
5373 }
5374 }
5375 else
5376 {
5377 /* It's not one of our sections, so don't allocate space. */
5379 }
5382 {
5383 /* If we don't need this section, strip it from the
5384 output file. This is mostly to handle .rela.bss and
5385 .rela.plt. We must create both sections in
5386 create_dynamic_sections, because they must be created
5387 before the linker maps input sections to output
5388 sections. The linker does that before
5389 adjust_dynamic_symbol is called, and it is that
5390 function which decides whether anything needs to go
5391 into these sections. */
5394 }
5399 /* Allocate memory for the section contents. */
5403 }
5406 {
5407 /* Add some entries to the .dynamic section. We fill in the
5408 values later, in ppc_elf_finish_dynamic_sections, but we
5409 must add the entries now so that we get the correct size for
5410 the .dynamic section. The DT_DEBUG entry is filled in by the
5411 dynamic linker and used by the debugger. */
5412 #define add_dynamic_entry(TAG, VAL) \
5413 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
5416 {
5419 }
5422 {
5428 }
5431 {
5434 }
5437 {
5442 }
5444 /* If any dynamic relocs apply to a read-only section, then we
5445 need a DT_TEXTREL entry. */
5448 info);
5451 {
5454 }
5458 }
5459 #undef add_dynamic_entry
5462 }
5464 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5466 static bfd_boolean
5468 {
5476 }
5477 \f
5478 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
5481 {
5490 };
5493 {
5498 };
5500 static bfd_boolean
5505 {
5506 struct one_fixup
5507 {
5510 bfd_vma toff;
5511 bfd_vma trampoff;
5512 };
5520 bfd_boolean changed;
5522 bfd_size_type trampoff;
5527 /* Nothing to do if there are no relocations, and no need to do
5528 anything with non-alloc sections. */
5535 /* Space for a branch around any trampolines. */
5540 /* Get a copy of the native relocations. */
5551 {
5563 {
5578 }
5580 /* Get the value of the symbol referred to by the reloc. */
5582 {
5583 /* A local symbol. */
5586 /* Read this BFD's local symbols. */
5588 {
5596 }
5604 else
5609 }
5610 else
5611 {
5612 /* Global symbol handling. */
5627 {
5631 {
5633 {
5636 }
5637 else
5638 {
5641 }
5642 }
5643 }
5645 ;
5648 {
5651 }
5652 else
5656 }
5658 /* If the branch and target are in the same section, you have
5659 no hope of adding stubs. We'll error out later should the
5660 branch overflow. */
5664 /* There probably isn't any reason to handle symbols in
5665 SEC_MERGE sections; SEC_MERGE doesn't seem a likely
5666 attribute for a code section, and we are only looking at
5667 branches. However, implement it correctly here as a
5668 reference for other target relax_section functions. */
5670 {
5671 /* At this stage in linking, no SEC_MERGE symbol has been
5672 adjusted, so all references to such symbols need to be
5673 passed through _bfd_merged_section_offset. (Later, in
5674 relocate_section, all SEC_MERGE symbols *except* for
5675 section symbols have been adjusted.)
5677 gas may reduce relocations against symbols in SEC_MERGE
5678 sections to a relocation against the section symbol when
5679 the original addend was zero. When the reloc is against
5680 a section symbol we should include the addend in the
5681 offset passed to _bfd_merged_section_offset, since the
5682 location of interest is the original symbol. On the
5683 other hand, an access to "sym+addend" where "sym" is not
5684 a section symbol should not include the addend; Such an
5685 access is presumed to be an offset from "sym"; The
5686 location of interest is just "sym". */
5692 toff);
5696 }
5697 /* PLTREL24 addends are special. */
5701 /* Attempted -shared link of non-pic code loses. */
5710 /* If the branch is in range, no need to do anything. */
5714 /* Look for an existing fixup to this address. */
5720 {
5726 /* Oh dear, we can't reach a trampoline. Don't try to add
5727 one. We'll report an error later. */
5731 {
5735 }
5736 else
5737 {
5741 }
5750 /* Hijack the old relocation. Since we need two
5751 relocations for this use a "composite" reloc. */
5753 stub_rtype);
5756 /* Record the fixup so we don't do it again this section. */
5765 }
5766 else
5767 {
5772 /* Nop out the reloc, since we're finalizing things here. */
5774 }
5776 /* Get the section contents. */
5778 {
5779 /* Get cached copy if it exists. */
5782 else
5783 {
5784 /* Go get them off disk. */
5787 }
5788 }
5790 /* Fix up the existing branch to hit the trampoline. */
5793 {
5811 }
5812 }
5814 /* Write out the trampolines. */
5817 {
5820 bfd_vma val;
5823 do
5824 {
5828 }
5836 /* Branch around the trampolines. */
5844 {
5847 }
5848 else
5849 {
5852 }
5856 {
5858 i++;
5862 }
5864 }
5868 {
5871 else
5872 {
5873 /* Cache the symbols for elf_link_input_bfd. */
5875 }
5876 }
5880 {
5883 else
5884 {
5885 /* Cache the section contents for elf_link_input_bfd. */
5887 }
5888 }
5891 {
5894 else
5896 }
5901 error_return:
5911 }
5912 \f
5913 /* What to do when ld finds relocations against symbols defined in
5914 discarded sections. */
5916 static unsigned int
5918 {
5926 }
5927 \f
5928 /* Fill in the address for a pointer generated in a linker section. */
5930 static bfd_vma
5934 bfd_vma relocation,
5936 {
5942 {
5943 /* Handle global symbol. */
5949 }
5950 else
5951 {
5952 /* Handle local symbol. */
5958 }
5962 lsect);
5965 /* Offset will always be a multiple of four, so use the bottom bit
5966 as a "written" flag. */
5968 {
5973 }
5979 #ifdef DEBUG
5983 #endif
5985 /* Subtract out the addend, because it will get added back in by the normal
5986 processing. */
5988 }
5990 /* The RELOCATE_SECTION function is called by the ELF backend linker
5991 to handle the relocations for a section.
5993 The relocs are always passed as Rela structures; if the section
5994 actually uses Rel structures, the r_addend field will always be
5995 zero.
5997 This function is responsible for adjust the section contents as
5998 necessary, and (if using Rela relocs and generating a
5999 relocatable output file) adjusting the reloc addend as
6000 necessary.
6002 This function does not have to worry about setting the reloc
6003 address or the reloc symbol index.
6005 LOCAL_SYMS is a pointer to the swapped in local symbols.
6007 LOCAL_SECTIONS is an array giving the section in the input file
6008 corresponding to the st_shndx field of each local symbol.
6010 The global hash table entry for the global symbols can be found
6011 via elf_sym_hashes (input_bfd).
6013 When generating relocatable output, this function must handle
6014 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
6015 going to be the section symbol corresponding to the output
6016 section, which means that the addend must be adjusted
6017 accordingly. */
6019 static bfd_boolean
6028 {
6034 Elf_Internal_Rela outrel;
6040 bfd_boolean is_vxworks_tls;
6042 #ifdef DEBUG
6048 #endif
6052 /* Initialize howto table if not already done. */
6060 /* We have to handle relocations in vxworks .tls_vars sections
6061 specially, because the dynamic loader is 'weird'. */
6068 {
6070 bfd_vma addend;
6071 bfd_reloc_status_type r;
6078 bfd_vma relocation;
6080 bfd_boolean unresolved_reloc;
6081 bfd_boolean warned;
6093 {
6099 }
6100 else
6101 {
6108 }
6111 {
6112 /* For relocs against symbols from removed linkonce sections,
6113 or sections discarded by a linker script, we just want the
6114 section contents zeroed. Avoid any special processing. */
6122 }
6125 {
6129 {
6130 /* R_PPC_PLTREL24 is rather special. If non-zero, the
6131 addend specifies the GOT pointer offset within .got2. */
6133 }
6135 }
6137 /* TLS optimizations. Replace instruction sequences and relocs
6138 based on information we collected in tls_optimize. We edit
6139 RELOCS so that --emit-relocs will output something sensible
6140 for the final instruction stream. */
6144 {
6148 {
6152 }
6153 }
6155 /* Ensure reloc mapping code below stays sane. */
6166 {
6174 {
6175 bfd_vma insn;
6182 }
6188 {
6197 else
6200 /* add -> addi. */
6206 /* load and store indexed -> dform. */
6210 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
6215 /* lwax -> lwa. */
6217 else
6224 /* Was PPC_TLS which sits on insn boundary, now
6225 PPC_TPREL16_LO which is at low-order half-word. */
6227 }
6240 {
6241 tls_gdld_hi:
6245 else
6246 {
6250 }
6252 }
6265 {
6267 bfd_vma offset;
6269 tls_ldgd_opt:
6274 {
6275 /* IE */
6285 }
6286 else
6287 {
6288 /* LE */
6292 {
6293 /* Was an LD reloc. */
6296 r_symndx++)
6306 }
6310 R_PPC_TPREL16_LO);
6313 }
6318 {
6319 /* We changed the symbol on an LD reloc. Start over
6320 in order to get h, sym, sec etc. right. */
6321 rel--;
6323 }
6324 }
6326 }
6328 /* Handle other relocations that tweak non-addend part of insn. */
6331 {
6335 /* Branch taken prediction relocations. */
6339 /* Fall thru */
6341 /* Branch not taken prediction relocations. */
6352 /* Invert 'y' bit if not the default. */
6358 }
6366 {
6383 /* GOT16 relocations. Like an ADDR16 using the symbol's
6384 address in the GOT as relocation value instead of the
6385 symbol's value itself. Also, create a GOT entry for the
6386 symbol and put the symbol value there. */
6419 dogot:
6420 {
6421 /* Relocation is to the entry for this symbol in the global
6422 offset table. */
6423 bfd_vma off;
6436 {
6437 bfd_boolean dyn;
6442 /* This is actually a static link, or it is a
6443 -Bsymbolic link and the symbol is defined
6444 locally, or the symbol was forced to be local
6445 because of a version file. */
6446 ;
6447 else
6448 {
6451 }
6453 }
6454 else
6455 {
6459 }
6461 /* The offset must always be a multiple of 4. We use the
6462 least significant bit to record whether we have already
6463 processed this entry. */
6467 else
6468 {
6479 /* We might have multiple got entries for this sym.
6480 Initialize them all. */
6481 do
6482 {
6486 {
6489 }
6491 {
6494 }
6496 {
6499 }
6501 {
6504 }
6506 /* Generate relocs for the dynamic linker. */
6511 {
6517 {
6520 {
6527 outrel.r_info
6529 }
6530 }
6537 else
6540 {
6544 }
6549 }
6551 /* Init the .got section contents if we're not
6552 emitting a reloc. */
6553 else
6554 {
6560 {
6566 {
6570 }
6571 }
6574 }
6579 }
6584 }
6590 {
6592 {
6598 {
6602 {
6605 }
6606 }
6607 }
6608 }
6613 /* Addends on got relocations don't make much sense.
6614 x+off@got is actually x@got+off, and since the got is
6615 generated by a hash table traversal, the value in the
6616 got at entry m+n bears little relation to the entry m. */
6620 input_bfd,
6621 input_section,
6624 sym_name);
6625 }
6628 /* Relocations that need no special processing. */
6630 /* It makes no sense to point a local relocation
6631 at a symbol not in this object. */
6633 {
6636 input_bfd,
6637 input_section,
6639 TRUE))
6642 }
6652 /* Relocations that may need to be propagated if this is a shared
6653 object. */
6659 /* The TPREL16 relocs shouldn't really be used in shared
6660 libs as they will result in DT_TEXTREL being set, but
6661 support them anyway. */
6686 /* fall through */
6701 /* If these relocations are not to a named symbol, they can be
6702 handled right here, no need to bother the dynamic linker. */
6706 /* fall through */
6714 /* fall through */
6716 dodyn:
6730 || (ELIMINATE_COPY_RELOCS
6736 {
6739 #ifdef DEBUG
6744 #endif
6746 /* When generating a shared object, these relocations
6747 are copied into the output file to be resolved at run
6748 time. */
6750 {
6753 name = (bfd_elf_string_from_elf_section
6762 input_section),
6767 }
6785 {
6789 }
6790 else
6791 {
6796 else
6797 {
6801 ;
6803 {
6806 }
6807 else
6808 {
6811 /* We are turning this relocation into one
6812 against a section symbol. It would be
6813 proper to subtract the symbol's value,
6814 osec->vma, from the emitted reloc addend,
6815 but ld.so expects buggy relocs. */
6819 {
6822 }
6824 #ifdef DEBUG
6829 #endif
6830 }
6833 }
6834 }
6843 /* This reloc will be computed at runtime. We clear the memory
6844 so that it contains predictable value. */
6848 {
6852 }
6853 }
6858 {
6865 else
6870 }
6873 /* Fall thru */
6879 /* Fall thru */
6882 relax32:
6883 {
6890 /* We're clearing the bits for R_PPC_ADDR16_HA
6891 and R_PPC_ADDR16_LO here. */
6895 /* t0 is HA, t1 is LO */
6902 }
6905 /* Indirect .sdata relocation. */
6908 relocation
6913 /* Indirect .sdata2 relocation. */
6916 relocation
6921 /* Handle the TOC16 reloc. We want to use the offset within the .got
6922 section, not the actual VMA. This is appropriate when generating
6923 an embedded ELF object, for which the .got section acts like the
6924 AIX .toc section. */
6935 /* Relocation is to the entry for this symbol in the
6936 procedure linkage table. */
6937 {
6943 {
6944 /* We didn't make a PLT entry for this symbol. This
6945 happens when statically linking PIC code, or when
6946 using -Bsymbolic. */
6948 }
6955 else
6959 }
6962 /* Relocate against _SDA_BASE_. */
6964 {
6974 {
6978 input_bfd,
6979 sym_name,
6981 name);
6982 }
6987 }
6990 /* Relocate against _SDA2_BASE_. */
6992 {
7000 {
7004 input_bfd,
7005 sym_name,
7007 name);
7012 }
7017 }
7020 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
7023 {
7034 {
7040 }
7044 {
7050 }
7054 {
7056 }
7058 else
7059 {
7063 input_bfd,
7064 sym_name,
7066 name);
7071 }
7078 }
7079 }
7082 /* Relocate against the beginning of the section. */
7091 /* Negative relocations. */
7117 input_bfd,
7119 sym_name);
7124 }
7126 /* Do any further special processing. */
7128 {
7139 /* It's just possible that this symbol is a weak symbol
7140 that's not actually defined anywhere. In that case,
7141 'sec' would be NULL, and we should leave the symbol
7142 alone (it will be set to zero elsewhere in the link). */
7145 /* Fall thru */
7153 /* Add 0x10000 if sign bit in 0:15 is set.
7154 Bits 0:15 are not used. */
7157 }
7159 #ifdef DEBUG
7164 sym_name,
7165 r_symndx,
7168 #endif
7173 {
7176 input_bfd,
7177 input_section,
7180 sym_name);
7182 }
7185 input_bfd,
7186 input_section,
7187 contents,
7189 relocation,
7190 addend);
7193 {
7195 {
7201 {
7202 /* Assume this is a call protected by other code that
7203 detect the symbol is undefined. If this is the case,
7204 we can safely ignore the overflow. If not, the
7205 program is hosed anyway, and a little warning isn't
7206 going to help. */
7209 }
7213 sym_name,
7216 input_bfd,
7217 input_section,
7220 }
7221 else
7222 {
7228 }
7229 }
7230 }
7232 #ifdef DEBUG
7234 #endif
7237 }
7238 \f
7239 #define PPC_LO(v) ((v) & 0xffff)
7240 #define PPC_HI(v) (((v) >> 16) & 0xffff)
7241 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
7243 /* Finish up dynamic symbol handling. We set the contents of various
7244 dynamic sections here. */
7246 static bfd_boolean
7251 {
7254 bfd_boolean doneone;
7256 #ifdef DEBUG
7259 #endif
7267 {
7269 {
7270 Elf_Internal_Rela rela;
7272 bfd_vma reloc_index;
7276 else
7277 {
7283 }
7285 /* This symbol has an entry in the procedure linkage table.
7286 Set it up. */
7288 {
7289 bfd_vma got_offset;
7292 /* The first three entries in .got.plt are reserved. */
7295 /* Use the right PLT. */
7299 /* Fill in the .plt on VxWorks. */
7301 {
7311 }
7312 else
7313 {
7314 bfd_vma got_loc
7315 = (got_offset
7328 }
7335 /* This instruction is an immediate load. The value loaded is
7336 the byte offset of the R_PPC_JMP_SLOT relocation from the
7337 start of the .rela.plt section. The value is stored in the
7338 low-order 16 bits of the load instruction. */
7339 /* NOTE: It appears that this is now an index rather than a
7340 prescaled offset. */
7344 /* This instruction is a PC-relative branch whose target is
7345 the start of the PLT section. The address of this branch
7346 instruction is 20 bytes beyond the start of this PLT entry.
7347 The address is encoded in bits 6-29, inclusive. The value
7348 stored is right-shifted by two bits, permitting a 26-bit
7349 offset. */
7359 /* Fill in the GOT entry corresponding to this PLT slot with
7360 the address immediately after the the "bctr" instruction
7361 in this PLT entry. */
7368 {
7369 /* Fill in a couple of entries in .rela.plt.unloaded. */
7375 /* Provide the @ha relocation for the first instruction. */
7380 R_PPC_ADDR16_HA);
7385 /* Provide the @l relocation for the second instruction. */
7390 R_PPC_ADDR16_LO);
7395 /* Provide a relocation for the GOT entry corresponding to this
7396 PLT slot. Point it at the middle of the .plt entry. */
7401 R_PPC_ADDR32);
7404 }
7406 /* VxWorks uses non-standard semantics for R_PPC_JMP_SLOT.
7407 In particular, the offset for the relocation is not the
7408 address of the PLT entry for this function, as specified
7409 by the ABI. Instead, the offset is set to the address of
7410 the GOT slot for this function. See EABI 4.4.4.1. */
7415 }
7416 else
7417 {
7422 {
7423 /* We don't need to fill in the .plt. The ppc dynamic
7424 linker will fill it in. */
7425 }
7426 else
7427 {
7433 }
7434 }
7436 /* Fill in the entry in the .rela.plt section. */
7445 {
7446 /* Mark the symbol as undefined, rather than as
7447 defined in the .plt section. Leave the value if
7448 there were any relocations where pointer equality
7449 matters (this is a clue for the dynamic linker, to
7450 make function pointer comparisons work between an
7451 application and shared library), otherwise set it
7452 to zero. */
7457 {
7458 /* This breaks function pointer comparisons, but
7459 that is better than breaking tests for a NULL
7460 function pointer. */
7462 }
7463 }
7465 }
7468 {
7469 bfd_vma plt;
7478 {
7493 {
7502 }
7503 else
7504 {
7513 }
7514 }
7515 else
7516 {
7526 /* We only need one non-PIC glink stub. */
7528 }
7529 }
7530 else
7532 }
7535 {
7537 Elf_Internal_Rela rela;
7540 /* This symbols needs a copy reloc. Set it up. */
7542 #ifdef DEBUG
7544 #endif
7550 else
7561 }
7563 #ifdef DEBUG
7565 #endif
7567 /* Mark some specially defined symbols as absolute. */
7576 }
7577 \f
7578 static enum elf_reloc_type_class
7580 {
7582 {
7593 }
7594 }
7595 \f
7596 /* Finish up the dynamic sections. */
7598 static bfd_boolean
7601 {
7605 bfd_vma got;
7608 #ifdef DEBUG
7610 #endif
7617 else
7627 {
7635 {
7636 Elf_Internal_Dyn dyn;
7642 {
7646 else
7666 {
7670 }
7678 }
7681 }
7682 }
7684 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
7685 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
7687 {
7689 bfd_vma val;
7701 }
7703 /* Fill in the first entry in the VxWorks procedure linkage table. */
7705 {
7706 /* Use the right PLT. */
7712 {
7713 bfd_vma got_value =
7723 }
7724 else
7725 {
7728 }
7737 {
7738 Elf_Internal_Rela rela;
7743 /* Output the @ha relocation for the first instruction. */
7752 /* Output the @l relocation for the second instruction. */
7761 /* Fix up the remaining relocations. They may have the wrong
7762 symbol index for _G_O_T_ or _P_L_T_ depending on the order
7763 in which symbols were output. */
7765 {
7766 Elf_Internal_Rela rel;
7782 }
7783 }
7784 }
7787 {
7790 bfd_vma res0;
7793 /*
7794 * PIC glink code is the following:
7795 *
7796 * # ith PLT code stub.
7797 * addis 11,30,(plt+(i-1)*4-got)@ha
7798 * lwz 11,(plt+(i-1)*4-got)@l(11)
7799 * mtctr 11
7800 * bctr
7801 *
7802 * # A table of branches, one for each plt entry.
7803 * # The idea is that the plt call stub loads ctr and r11 with these
7804 * # addresses, so (r11 - res_0) gives the plt index * 4.
7805 * res_0: b PLTresolve
7806 * res_1: b PLTresolve
7807 * .
7808 * # Some number of entries towards the end can be nops
7809 * res_n_m3: nop
7810 * res_n_m2: nop
7811 * res_n_m1:
7812 *
7813 * PLTresolve:
7814 * addis 11,11,(1f-res_0)@ha
7815 * mflr 0
7816 * bcl 20,31,1f
7817 * 1: addi 11,11,(1b-res_0)@l
7818 * mflr 12
7819 * mtlr 0
7820 * sub 11,11,12 # r11 = index * 4
7821 * addis 12,12,(got+4-1b)@ha
7822 * lwz 0,(got+4-1b)@l(12) # got[1] address of dl_runtime_resolve
7823 * lwz 12,(got+8-1b)@l(12) # got[2] contains the map address
7824 * mtctr 0
7825 * add 0,11,11
7826 * add 11,0,11 # r11 = index * 12 = reloc offset.
7827 * bctr
7828 */
7830 {
7831 ADDIS_11_11,
7832 MFLR_0,
7833 BCL_20_31,
7834 ADDI_11_11,
7835 MFLR_12,
7836 MTLR_0,
7837 SUB_11_11_12,
7838 ADDIS_12_12,
7839 LWZ_0_12,
7840 LWZ_12_12,
7841 MTCTR_0,
7842 ADD_0_11_11,
7843 ADD_11_0_11,
7844 BCTR,
7845 NOP,
7846 NOP
7847 };
7849 /*
7850 * Non-PIC glink code is a little simpler.
7851 *
7852 * # ith PLT code stub.
7853 * lis 11,(plt+(i-1)*4)@ha
7854 * lwz 11,(plt+(i-1)*4)@l(11)
7855 * mtctr 11
7856 * bctr
7857 *
7858 * The branch table is the same, then comes
7859 *
7860 * PLTresolve:
7861 * lis 12,(got+4)@ha
7862 * addis 11,11,(-res_0)@ha
7863 * lwz 0,(got+4)@l(12) # got[1] address of dl_runtime_resolve
7864 * addi 11,11,(-res_0)@l # r11 = index * 4
7865 * mtctr 0
7866 * add 0,11,11
7867 * lwz 12,(got+8)@l(12) # got[2] contains the map address
7868 * add 11,0,11 # r11 = index * 12 = reloc offset.
7869 * bctr
7870 */
7872 {
7873 LIS_12,
7874 ADDIS_11_11,
7875 LWZ_0_12,
7876 ADDI_11_11,
7877 MTCTR_0,
7878 ADD_0_11_11,
7879 LWZ_12_12,
7880 ADD_11_0_11,
7881 BCTR,
7882 NOP,
7883 NOP,
7884 NOP,
7885 NOP,
7886 NOP,
7887 NOP,
7888 NOP
7889 };
7896 /* Build the branch table, one for each plt entry (less one),
7897 and perhaps some padding. */
7903 {
7906 }
7908 {
7911 }
7917 /* Last comes the PLTresolve stub. */
7919 {
7920 bfd_vma bcl;
7923 {
7926 }
7940 {
7945 }
7946 else
7947 {
7952 }
7953 }
7954 else
7955 {
7957 {
7960 }
7970 {
7975 }
7976 else
7977 {
7982 }
7983 }
7984 }
7987 }
7988 \f
7989 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
7991 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
7993 #define ELF_ARCH bfd_arch_powerpc
7994 #define ELF_MACHINE_CODE EM_PPC
7995 #ifdef __QNXTARGET__
7996 #define ELF_MAXPAGESIZE 0x1000
7997 #else
7998 #define ELF_MAXPAGESIZE 0x10000
7999 #endif
8000 #define ELF_MINPAGESIZE 0x1000
8001 #define ELF_COMMONPAGESIZE 0x1000
8002 #define elf_info_to_howto ppc_elf_info_to_howto
8004 #ifdef EM_CYGNUS_POWERPC
8005 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
8006 #endif
8008 #ifdef EM_PPC_OLD
8009 #define ELF_MACHINE_ALT2 EM_PPC_OLD
8010 #endif
8012 #define elf_backend_plt_not_loaded 1
8013 #define elf_backend_can_gc_sections 1
8014 #define elf_backend_can_refcount 1
8015 #define elf_backend_rela_normal 1
8017 #define bfd_elf32_mkobject ppc_elf_mkobject
8018 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
8019 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
8020 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
8021 #define bfd_elf32_bfd_reloc_name_lookup ppc_elf_reloc_name_lookup
8022 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
8023 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create
8024 #define bfd_elf32_get_synthetic_symtab ppc_elf_get_synthetic_symtab
8026 #define elf_backend_object_p ppc_elf_object_p
8027 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
8028 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
8029 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
8030 #define elf_backend_relocate_section ppc_elf_relocate_section
8031 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
8032 #define elf_backend_check_relocs ppc_elf_check_relocs
8033 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol
8034 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
8035 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
8036 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
8037 #define elf_backend_hash_symbol ppc_elf_hash_symbol
8038 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
8039 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
8040 #define elf_backend_fake_sections ppc_elf_fake_sections
8041 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
8042 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
8043 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
8044 #define elf_backend_write_core_note ppc_elf_write_core_note
8045 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
8046 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing
8047 #define elf_backend_final_write_processing ppc_elf_final_write_processing
8048 #define elf_backend_write_section ppc_elf_write_section
8049 #define elf_backend_get_sec_type_attr ppc_elf_get_sec_type_attr
8050 #define elf_backend_plt_sym_val ppc_elf_plt_sym_val
8051 #define elf_backend_action_discarded ppc_elf_action_discarded
8052 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
8056 /* VxWorks Target */
8058 #undef TARGET_LITTLE_SYM
8059 #undef TARGET_LITTLE_NAME
8061 #undef TARGET_BIG_SYM
8062 #define TARGET_BIG_SYM bfd_elf32_powerpc_vxworks_vec
8063 #undef TARGET_BIG_NAME
8066 /* VxWorks uses the elf default section flags for .plt. */
8069 {
8077 }
8079 /* Like ppc_elf_link_hash_table_create, but overrides
8080 appropriately for VxWorks. */
8083 {
8088 {
8096 }
8098 }
8100 /* Tweak magic VxWorks symbols as they are loaded. */
8101 static bfd_boolean
8109 {
8111 valp))
8115 }
8117 static void
8119 {
8122 }
8124 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
8125 define it. */
8126 #undef elf_backend_want_plt_sym
8127 #define elf_backend_want_plt_sym 1
8128 #undef elf_backend_want_got_plt
8129 #define elf_backend_want_got_plt 1
8130 #undef elf_backend_got_symbol_offset
8131 #define elf_backend_got_symbol_offset 0
8132 #undef elf_backend_plt_not_loaded
8133 #define elf_backend_plt_not_loaded 0
8134 #undef elf_backend_plt_readonly
8135 #define elf_backend_plt_readonly 1
8136 #undef elf_backend_got_header_size
8137 #define elf_backend_got_header_size 12
8139 #undef bfd_elf32_get_synthetic_symtab
8141 #undef bfd_elf32_bfd_link_hash_table_create
8142 #define bfd_elf32_bfd_link_hash_table_create \
8143 ppc_elf_vxworks_link_hash_table_create
8144 #undef elf_backend_add_symbol_hook
8145 #define elf_backend_add_symbol_hook \
8146 ppc_elf_vxworks_add_symbol_hook
8147 #undef elf_backend_link_output_symbol_hook
8148 #define elf_backend_link_output_symbol_hook \
8149 elf_vxworks_link_output_symbol_hook
8150 #undef elf_backend_final_write_processing
8151 #define elf_backend_final_write_processing \
8152 ppc_elf_vxworks_final_write_processing
8153 #undef elf_backend_get_sec_type_attr
8154 #define elf_backend_get_sec_type_attr \
8155 ppc_elf_vxworks_get_sec_type_attr
8156 #undef elf_backend_emit_relocs
8157 #define elf_backend_emit_relocs \
8158 elf_vxworks_emit_relocs
8160 #undef elf32_bed
8161 #define elf32_bed ppc_elf_vxworks_bed