| blob | 84e72b8a041e1b141a1baba07cf457ae63e62767 |
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 {
2315 }
2317 static bfd_boolean
2319 {
2324 }
2326 static long
2330 {
2335 bfd_vma stub_vma;
2359 /* Call common code to handle old-style executable PLTs. */
2364 /* If this object was prelinked, the prelinker stored the address
2365 of .glink at got[1]. If it wasn't prelinked, got[1] will be zero. */
2368 {
2382 {
2383 Elf_Internal_Dyn dyn;
2390 {
2398 }
2399 }
2401 }
2403 /* Otherwise we read the first plt entry. */
2405 {
2408 }
2413 /* The .glink section usually does not survive the final
2414 link; search for the section (usually .text) where the
2415 glink stubs now reside. */
2420 /* Determine glink PLT resolver by reading the relative branch
2421 from the first glink stub. */
2424 {
2427 /* The first glink stub may either branch to the resolver ... */
2432 /* ... or fall through a bunch of NOPs. */
2439 {
2442 }
2443 }
2447 /* If the stubs are those for -shared/-pie then we might have
2448 multiple stubs for each plt entry. If that is the case then
2449 there is no way to associate stubs with their plt entries short
2450 of figuring out the GOT pointer value used in the stub. */
2478 {
2482 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
2483 we are defining a symbol, ensure one of them is set. */
2498 }
2500 /* Add a symbol at the start of the glink branch table. */
2509 s++;
2510 count++;
2513 {
2514 /* Add a symbol for the glink PLT resolver. */
2523 s++;
2524 count++;
2525 }
2528 }
2529 \f
2530 /* The following functions are specific to the ELF linker, while
2531 functions above are used generally. They appear in this file more
2532 or less in the order in which they are called. eg.
2533 ppc_elf_check_relocs is called early in the link process,
2534 ppc_elf_finish_dynamic_sections is one of the last functions
2535 called. */
2537 /* The PPC linker needs to keep track of the number of relocs that it
2538 decides to copy as dynamic relocs in check_relocs for each symbol.
2539 This is so that it can later discard them if they are found to be
2540 unnecessary. We store the information in a field extending the
2541 regular ELF linker hash table. */
2543 struct ppc_elf_dyn_relocs
2544 {
2547 /* The input section of the reloc. */
2550 /* Total number of relocs copied for the input section. */
2551 bfd_size_type count;
2553 /* Number of pc-relative relocs copied for the input section. */
2554 bfd_size_type pc_count;
2555 };
2557 /* Track PLT entries needed for a given symbol. We might need more
2558 than one glink entry per symbol. */
2559 struct plt_entry
2560 {
2563 /* -fPIC uses multiple GOT sections, one per file, called ".got2".
2564 This field stores the offset into .got2 used to initialise the
2565 GOT pointer reg. It will always be at least 32768 (and for
2566 current gcc this is the only offset used). */
2567 bfd_vma addend;
2569 /* The .got2 section. */
2572 /* PLT refcount or offset. */
2573 union
2574 {
2575 bfd_signed_vma refcount;
2576 bfd_vma offset;
2579 /* .glink stub offset. */
2580 bfd_vma glink_offset;
2581 };
2583 /* Of those relocs that might be copied as dynamic relocs, this function
2584 selects those that must be copied when linking a shared library,
2585 even when the symbol is local. */
2587 static int
2590 {
2592 {
2609 }
2610 }
2612 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
2613 copying dynamic variables from a shared lib into an app's dynbss
2614 section, and instead use a dynamic relocation to point into the
2615 shared lib. */
2616 #define ELIMINATE_COPY_RELOCS 1
2618 /* PPC ELF linker hash entry. */
2620 struct ppc_elf_link_hash_entry
2621 {
2624 /* If this symbol is used in the linker created sections, the processor
2625 specific backend uses this field to map the field into the offset
2626 from the beginning of the section. */
2629 /* Track dynamic relocs copied for this symbol. */
2632 /* Contexts in which symbol is used in the GOT (or TOC).
2633 TLS_GD .. TLS_TLS bits are or'd into the mask as the
2634 corresponding relocs are encountered during check_relocs.
2635 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
2636 indicate the corresponding GOT entry type is not needed. */
2645 /* Nonzero if we have seen a small data relocation referring to this
2646 symbol. */
2648 };
2650 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent))
2652 /* PPC ELF linker hash table. */
2654 struct ppc_elf_link_hash_table
2655 {
2658 /* Short-cuts to get to dynamic linker sections. */
2671 /* The (unloaded but important) .rela.plt.unloaded on VxWorks. */
2674 /* The .got.plt section (VxWorks only)*/
2677 /* Shortcut to __tls_get_addr. */
2680 /* The bfd that forced an old-style PLT. */
2683 /* TLS local dynamic got entry handling. */
2685 bfd_signed_vma refcount;
2686 bfd_vma offset;
2689 /* Offset of PltResolve function in glink. */
2690 bfd_vma glink_pltresolve;
2692 /* Size of reserved GOT entries. */
2694 /* Non-zero if allocating the header left a gap. */
2697 /* The type of PLT we have chosen to use. */
2700 /* Set if we should emit symbols for stubs. */
2703 /* True if the target system is VxWorks. */
2706 /* The size of PLT entries. */
2708 /* The distance between adjacent PLT slots. */
2710 /* The size of the first PLT entry. */
2713 /* Small local sym to section mapping cache. */
2715 };
2717 /* Get the PPC ELF linker hash table from a link_info structure. */
2719 #define ppc_elf_hash_table(p) \
2720 ((struct ppc_elf_link_hash_table *) (p)->hash)
2722 /* Create an entry in a PPC ELF linker hash table. */
2728 {
2729 /* Allocate the structure if it has not already been allocated by a
2730 subclass. */
2732 {
2737 }
2739 /* Call the allocation method of the superclass. */
2742 {
2746 }
2749 }
2751 /* Create a PPC ELF linker hash table. */
2755 {
2763 ppc_elf_link_hash_newfunc,
2765 {
2768 }
2788 }
2790 /* Create .got and the related sections. */
2792 static bfd_boolean
2794 {
2797 flagword flags;
2808 {
2812 }
2813 else
2814 {
2815 /* The powerpc .got has a blrl instruction in it. Mark it
2816 executable. */
2821 }
2831 }
2833 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2834 to output sections (just like _bfd_elf_create_dynamic_sections has
2835 to create .dynbss and .rela.bss). */
2837 static bfd_boolean
2839 {
2842 flagword flags;
2870 {
2877 }
2890 /* The VxWorks PLT is a loaded section with contents. */
2893 }
2895 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2897 static void
2901 {
2908 {
2910 {
2914 /* Add reloc counts against the indirect sym to the direct sym
2915 list. Merge any entries against the same section. */
2917 {
2922 {
2927 }
2930 }
2932 }
2936 }
2941 /* If called to transfer flags for a weakdef during processing
2942 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
2943 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
2955 /* If we were called to copy over info for a weak sym, that's all. */
2959 /* Copy over the GOT refcount entries that we may have already seen to
2960 the symbol which just became indirect. */
2964 /* And plt entries. */
2966 {
2968 {
2973 {
2978 {
2982 }
2985 }
2987 }
2991 }
2994 {
3002 }
3003 }
3005 /* Hook called by the linker routine which adds symbols from an object
3006 file. We use it to put .comm items in .sbss, and not .bss. */
3008 static bfd_boolean
3016 {
3021 {
3022 /* Common symbols less than or equal to -G nn bytes are automatically
3023 put into .sbss. */
3028 {
3036 flags);
3039 }
3043 }
3046 }
3047 \f
3048 static bfd_boolean
3051 {
3060 }
3062 /* Create a special linker section. */
3064 static bfd_boolean
3067 flagword flags,
3069 {
3076 /* Record the first bfd that needs the special sections. */
3082 flags);
3089 }
3091 /* Find a linker generated pointer with a given addend and type. */
3094 elf_find_pointer_linker_section
3096 bfd_vma addend,
3098 {
3104 }
3106 /* Allocate a pointer to live in a linker created section. */
3108 static bfd_boolean
3113 {
3117 bfd_size_type amt;
3121 /* Is this a global symbol? */
3123 {
3126 /* Has this symbol already been allocated? If so, our work is done. */
3130 lsect))
3134 }
3135 else
3136 {
3139 /* Allocation of a pointer to a local symbol. */
3142 /* Allocate a table to hold the local symbols if first time. */
3144 {
3155 }
3157 /* Has this symbol already been allocated? If so, our work is done. */
3160 lsect))
3164 }
3166 /* Allocate space for a pointer in the linker section, and allocate
3167 a new pointer record from internal memory. */
3183 #ifdef DEBUG
3188 #endif
3191 }
3193 static bfd_boolean
3198 {
3203 {
3211 }
3217 }
3219 static bfd_boolean
3222 {
3231 {
3241 }
3244 }
3248 {
3257 }
3259 static void
3261 {
3264 abfd,
3267 }
3269 /* Look through the relocs for a section during the first phase, and
3270 allocate space in the global offset table or procedure linkage
3271 table. */
3273 static bfd_boolean
3278 {
3289 /* Don't do anything special with non-loaded, non-alloced sections.
3290 In particular, any relocs in such sections should not affect GOT
3291 and PLT reference counting (ie. we don't allow them to create GOT
3292 or PLT entries), there's no possibility or desire to optimize TLS
3293 relocs, and there's not much point in propagating relocs to shared
3294 libs that the dynamic linker won't relocate. */
3298 #ifdef DEBUG
3301 #endif
3305 /* Initialize howto table if not already done. */
3317 {
3326 else
3327 {
3332 }
3334 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
3335 This shows up in particular in an R_PPC_ADDR32 in the eabi
3336 startup code. */
3340 {
3346 }
3350 {
3379 dogottls:
3381 /* Fall thru */
3383 /* GOT16 relocations */
3388 /* This symbol requires a global offset table entry. */
3390 {
3395 }
3397 {
3400 }
3401 else
3402 /* This is a global offset table entry for a local symbol. */
3407 /* Indirect .sdata relocation. */
3410 {
3413 }
3422 {
3425 }
3428 /* Indirect .sdata2 relocation. */
3431 {
3434 }
3443 {
3446 }
3451 {
3454 }
3459 {
3462 }
3467 {
3470 }
3475 {
3478 }
3484 {
3487 }
3495 {
3498 }
3507 {
3510 }
3521 #ifdef DEBUG
3523 #endif
3524 /* This symbol requires a procedure linkage table entry. We
3525 actually build the entry in finish_dynamic_symbol,
3526 because this might be a case of linking PIC code without
3527 linking in any dynamic objects, in which case we don't
3528 need to generate a procedure linkage table after all. */
3531 {
3532 /* It does not make sense to have a procedure linkage
3533 table entry for a local symbol. */
3536 abfd,
3537 sec,
3542 }
3543 else
3544 {
3548 {
3551 }
3555 }
3558 /* The following relocations don't need to propagate the
3559 relocation if linking a shared object since they are
3560 section relative. */
3579 /* These are just markers. */
3586 /* These should only appear in dynamic objects. */
3593 /* These aren't handled yet. We'll report an error later. */
3602 /* This refers only to functions defined in the shared library. */
3605 {
3608 }
3611 /* This relocation describes the C++ object vtable hierarchy.
3612 Reconstruct it for later use during GC. */
3618 /* This relocation describes which C++ vtable entries are actually
3619 used. Record for later use during GC. */
3627 /* We shouldn't really be seeing these. */
3637 /* Nor these. */
3648 {
3649 /* Old -fPIC gcc code has .long LCTOC1-LCFx just before
3650 the start of a function, which assembles to a REL32
3651 reference to .got2. If we detect one of these, then
3652 force the old PLT layout because the linker cannot
3653 reliably deduce the GOT pointer value needed for
3654 PLT call stubs. */
3658 r_symndx);
3660 {
3663 }
3664 }
3667 /* fall through */
3677 {
3678 /* We may need a plt entry if the symbol turns out to be
3679 a function defined in a dynamic object. */
3683 /* We may need a copy reloc too. */
3686 }
3696 {
3698 {
3701 }
3703 }
3704 /* fall through */
3711 {
3712 /* We may need a plt entry if the symbol turns out to be
3713 a function defined in a dynamic object. */
3717 }
3719 dodyn:
3720 /* If we are creating a shared library, and this is a reloc
3721 against a global symbol, or a non PC relative reloc
3722 against a local symbol, then we need to copy the reloc
3723 into the shared library. However, if we are linking with
3724 -Bsymbolic, we do not need to copy a reloc against a
3725 global symbol which is defined in an object we are
3726 including in the link (i.e., DEF_REGULAR is set). At
3727 this point we have not seen all the input files, so it is
3728 possible that DEF_REGULAR is not set now but will be set
3729 later (it is never cleared). In case of a weak definition,
3730 DEF_REGULAR may be cleared later by a strong definition in
3731 a shared library. We account for that possibility below by
3732 storing information in the dyn_relocs field of the hash
3733 table entry. A similar situation occurs when creating
3734 shared libraries and symbol visibility changes render the
3735 symbol local.
3737 If on the other hand, we are creating an executable, we
3738 may need to keep relocations for symbols satisfied by a
3739 dynamic library if we manage to avoid copy relocs for the
3740 symbol. */
3747 || (ELIMINATE_COPY_RELOCS
3752 {
3756 #ifdef DEBUG
3758 "ppc_elf_check_relocs needs to "
3762 #endif
3764 {
3767 name = (bfd_elf_string_from_elf_section
3782 {
3783 flagword flags;
3789 name,
3790 flags);
3795 }
3797 }
3799 /* If this is a global symbol, we count the number of
3800 relocations we need for this symbol. */
3802 {
3804 }
3805 else
3806 {
3807 /* Track dynamic relocs needed for local syms too.
3808 We really need local syms available to do this
3809 easily. Oh well. */
3821 }
3825 {
3834 }
3839 }
3842 }
3843 }
3846 }
3847 \f
3849 /* Merge object attributes from IBFD into OBFD. Raise an error if
3850 there are conflicting attributes. */
3851 static bfd_boolean
3853 {
3858 {
3859 /* This is the first object. Copy the attributes. */
3862 /* Use the Tag_null value to indicate the attributes have been
3863 initialized. */
3867 }
3872 /* Check for conflicting Tag_GNU_Power_ABI_FP attributes and merge
3873 non-conflicting ones. */
3877 {
3882 ;
3884 _bfd_error_handler
3887 _bfd_error_handler
3891 _bfd_error_handler
3895 _bfd_error_handler
3899 _bfd_error_handler
3902 _bfd_error_handler
3905 else
3906 _bfd_error_handler
3909 }
3911 /* Check for conflicting Tag_GNU_Power_ABI_Vector attributes and
3912 merge non-conflicting ones. */
3916 {
3920 {
3924 }
3927 {
3931 }
3937 ;
3938 /* For now, allow generic to transition to AltiVec or SPE
3939 without a warning. If GCC marked files with their stack
3940 alignment and used don't-care markings for files which are
3941 not affected by the vector ABI, we could warn about this
3942 case too. */
3946 ;
3948 _bfd_error_handler
3952 _bfd_error_handler
3955 else
3956 _bfd_error_handler
3959 }
3961 /* Merge Tag_compatibility attributes and any common GNU ones. */
3965 }
3967 /* Merge backend specific data from an object file to the output
3968 object file when linking. */
3970 static bfd_boolean
3972 {
3973 flagword old_flags;
3974 flagword new_flags;
3975 bfd_boolean error;
3980 /* Check if we have the same endianess. */
3990 {
3991 /* First call, no flags set. */
3994 }
3996 /* Compatible flags are ok. */
3998 ;
4000 /* Incompatible flags. */
4001 else
4002 {
4003 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
4004 to be linked with either. */
4008 {
4013 }
4016 {
4021 }
4023 /* The output is -mrelocatable-lib iff both the input files are. */
4027 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
4028 but each input file is either -mrelocatable or -mrelocatable-lib. */
4034 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
4035 any module uses it. */
4041 /* Warn about any other mismatches. */
4043 {
4049 }
4052 {
4055 }
4056 }
4059 }
4060 \f
4061 /* Choose which PLT scheme to use, and set .plt flags appropriately.
4062 Returns -1 on error, 0 for old PLT, 1 for new PLT. */
4063 int
4068 {
4070 flagword flags;
4075 {
4078 else
4079 {
4083 /* Look through the reloc flags left by ppc_elf_check_relocs.
4084 Use the old style bss plt if a file makes plt calls
4085 without using the new relocs, and if ld isn't given
4086 --secure-plt and we never see REL16 relocs. */
4091 {
4095 {
4099 }
4100 }
4102 }
4103 }
4112 {
4116 /* The new PLT is a loaded section. */
4121 /* The new GOT is not executable. */
4125 }
4126 else
4127 {
4128 /* Stop an unused .glink section from affecting .text alignment. */
4132 }
4134 }
4135 \f
4136 /* Return the section that should be marked against GC for a given
4137 relocation. */
4145 {
4148 {
4152 }
4155 }
4157 /* Update the got, plt and dynamic reloc reference counts for the
4158 section being removed. */
4160 static bfd_boolean
4165 {
4189 {
4196 {
4208 {
4209 /* Everything must go for SEC. */
4212 }
4213 }
4217 {
4239 {
4242 }
4244 {
4247 }
4257 /* Fall thru */
4280 {
4285 }
4290 }
4291 }
4293 }
4294 \f
4295 /* Set htab->tls_get_addr and call the generic ELF tls_setup function. */
4297 asection *
4299 {
4306 {
4309 }
4314 }
4316 /* Run through all the TLS relocs looking for optimization
4317 opportunities. */
4319 bfd_boolean
4322 {
4332 /* Make two passes through the relocs. First time check that tls
4333 relocs involved in setting up a tls_get_addr call are indeed
4334 followed by such a call. If they are not, exclude them from
4335 the optimizations done on the second pass. */
4338 {
4344 {
4347 /* Read the relocations. */
4355 {
4361 bfd_boolean is_local;
4367 {
4375 }
4385 {
4389 /* Fall thru */
4393 /* These relocs should never be against a symbol
4394 defined in a shared lib. Leave them alone if
4395 that turns out to be the case. */
4399 /* LD -> LE */
4407 /* Fall thru */
4412 /* GD -> LE */
4414 else
4415 /* GD -> IE */
4425 {
4426 /* IE -> LE */
4430 }
4431 else
4436 }
4439 {
4444 {
4449 /* The next instruction should be a call to
4450 __tls_get_addr. Peek at the reloc to be sure. */
4459 {
4470 }
4471 }
4473 /* Uh oh, we didn't find the expected call. We
4474 could just mark this symbol to exclude it
4475 from tls optimization but it's safer to skip
4476 the entire section. */
4479 }
4482 {
4485 }
4486 else
4487 {
4493 {
4500 {
4504 }
4505 }
4513 }
4516 {
4517 /* We managed to get rid of a got entry. */
4520 }
4523 {
4529 }
4533 }
4537 }
4541 {
4544 else
4546 }
4547 }
4549 }
4550 \f
4551 /* Return true if we have dynamic relocs that apply to read-only sections. */
4553 static bfd_boolean
4555 {
4559 {
4566 }
4568 }
4570 /* Adjust a symbol defined by a dynamic object and referenced by a
4571 regular object. The current definition is in some section of the
4572 dynamic object, but we're not including those sections. We have to
4573 change the definition to something the rest of the link can
4574 understand. */
4576 static bfd_boolean
4579 {
4583 #ifdef DEBUG
4586 #endif
4588 /* Make sure we know what is going on here. */
4597 /* Deal with function syms. */
4600 {
4601 /* Clear procedure linkage table information for any symbol that
4602 won't need a .plt entry. */
4611 {
4612 /* A PLT entry is not required/allowed when:
4614 1. We are not using ld.so; because then the PLT entry
4615 can't be set up, so we can't use one. In this case,
4616 ppc_elf_adjust_dynamic_symbol won't even be called.
4618 2. GC has rendered the entry unused.
4620 3. We know for certain that a call to this symbol
4621 will go to this object, or will remain undefined. */
4624 }
4625 else
4626 {
4627 /* After adjust_dynamic_symbol, non_got_ref set means that
4628 dyn_relocs for this symbol should be discarded.
4629 If we get here we know we are making a PLT entry for this
4630 symbol, and in an executable we'd normally resolve
4631 relocations against this symbol to the PLT entry. Allow
4632 dynamic relocs if the reference is weak, and the dynamic
4633 relocs will not cause text relocation. */
4640 }
4642 }
4643 else
4646 /* If this is a weak symbol, and there is a real definition, the
4647 processor independent code will have arranged for us to see the
4648 real definition first, and we can just use the same value. */
4650 {
4658 }
4660 /* This is a reference to a symbol defined by a dynamic object which
4661 is not a function. */
4663 /* If we are creating a shared library, we must presume that the
4664 only references to the symbol are via the global offset table.
4665 For such cases we need not do anything here; the relocations will
4666 be handled correctly by relocate_section. */
4670 /* If there are no references to this symbol that do not use the
4671 GOT, we don't need to generate a copy reloc. */
4675 /* If we didn't find any dynamic relocs in read-only sections, then
4676 we'll be keeping the dynamic relocs and avoiding the copy reloc.
4677 We can't do this if there are any small data relocations. This
4678 doesn't work on VxWorks, where we can not have dynamic
4679 relocations (other than copy and jump slot relocations) in an
4680 executable. */
4686 {
4689 }
4692 {
4696 }
4698 /* We must allocate the symbol in our .dynbss section, which will
4699 become part of the .bss section of the executable. There will be
4700 an entry for this symbol in the .dynsym section. The dynamic
4701 object will contain position independent code, so all references
4702 from the dynamic object to this symbol will go through the global
4703 offset table. The dynamic linker will use the .dynsym entry to
4704 determine the address it must put in the global offset table, so
4705 both the dynamic object and the regular object will refer to the
4706 same memory location for the variable.
4708 Of course, if the symbol is referenced using SDAREL relocs, we
4709 must instead allocate it in .sbss. */
4713 else
4717 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
4718 copy the initial value out of the dynamic object and into the
4719 runtime process image. We need to remember the offset into the
4720 .rela.bss section we are going to use. */
4722 {
4727 else
4732 }
4735 }
4736 \f
4737 /* Generate a symbol to mark plt call stubs. For non-PIC code the sym is
4738 xxxxxxxx.plt_call32.<callee> where xxxxxxxx is a hex number, usually 0,
4739 specifying the addend on the plt relocation. For -fpic code, the sym
4740 is xxxxxxxx.plt_pic32.<callee>, and for -fPIC
4741 xxxxxxxx.got2.plt_pic32.<callee>. */
4743 static bfd_boolean
4747 {
4756 else
4776 {
4785 }
4787 }
4789 /* Allocate NEED contiguous space in .got, and return the offset.
4790 Handles allocation of the got header when crossing 32k. */
4792 static bfd_vma
4794 {
4795 bfd_vma where;
4799 {
4802 }
4803 else
4804 {
4807 {
4810 }
4811 else
4812 {
4815 {
4818 }
4821 }
4822 }
4824 }
4826 /* Allocate space in associated reloc sections for dynamic relocs. */
4828 static bfd_boolean
4830 {
4840 /* When warning symbols are created, they **replace** the "real"
4841 entry in the hash table, thus we never get to see the real
4842 symbol in a hash traversal. So look at it now. */
4847 {
4854 {
4855 /* Make sure this symbol is output as a dynamic symbol. */
4858 {
4861 }
4865 {
4869 {
4871 {
4874 }
4879 {
4882 }
4887 {
4890 }
4896 }
4897 else
4898 {
4900 {
4901 /* If this is the first .plt entry, make room
4902 for the special first entry. */
4906 /* The PowerPC PLT is actually composed of two
4907 parts, the first part is 2 words (for a load
4908 and a jump), and then there is a remaining
4909 word available at the end. */
4916 /* If this symbol is not defined in a regular
4917 file, and we are not generating a shared
4918 library, then set the symbol to this location
4919 in the .plt. This is required to make
4920 function pointers compare as equal between
4921 the normal executable and the shared library. */
4925 {
4928 }
4930 /* Make room for this entry. */
4932 /* After the 8192nd entry, room for two entries
4933 is allocated. */
4939 }
4941 }
4943 /* We also need to make an entry in the .rela.plt section. */
4945 {
4949 {
4950 /* Allocate space for the unloaded relocations. */
4952 {
4955 {
4959 }
4964 }
4966 /* Every PLT entry has an associated GOT entry in
4967 .got.plt. */
4969 }
4971 }
4972 }
4973 else
4975 }
4976 else
4980 {
4983 }
4984 }
4985 else
4986 {
4989 }
4993 {
4994 /* Make sure this symbol is output as a dynamic symbol. */
4998 {
5001 }
5005 {
5006 /* If just an LD reloc, we'll just use htab->tlsld_got.offset. */
5009 }
5010 else
5011 {
5012 bfd_boolean dyn;
5015 {
5024 }
5025 else
5033 {
5034 /* All the entries we allocated need relocs.
5035 Except LD only needs one. */
5039 }
5040 }
5041 }
5042 else
5049 /* In the shared -Bsymbolic case, discard space allocated for
5050 dynamic pc-relative relocs against symbols which turn out to be
5051 defined in regular objects. For the normal shared case, discard
5052 space for relocs that have become local due to symbol visibility
5053 changes. */
5056 {
5057 /* Relocs that use pc_count are those that appear on a call insn,
5058 or certain REL relocs (see must_be_dyn_reloc) that can be
5059 generated via assembly. We want calls to protected symbols to
5060 resolve directly to the function rather than going via the plt.
5061 If people want function pointer comparisons to work as expected
5062 then they should avoid writing weird assembly. */
5064 {
5068 {
5073 else
5075 }
5076 }
5079 {
5083 {
5086 else
5088 }
5089 }
5091 /* Discard relocs on undefined symbols that must be local. */
5098 /* Also discard relocs on undefined weak syms with non-default
5099 visibility. */
5102 {
5106 /* Make sure undefined weak symbols are output as a dynamic
5107 symbol in PIEs. */
5110 {
5113 }
5114 }
5115 }
5117 {
5118 /* For the non-shared case, discard space for relocs against
5119 symbols which turn out to need copy relocs or are not
5120 dynamic. */
5124 {
5125 /* Make sure this symbol is output as a dynamic symbol.
5126 Undefined weak syms won't yet be marked as dynamic. */
5129 {
5132 }
5134 /* If that succeeded, we know we'll be keeping all the
5135 relocs. */
5138 }
5142 keep: ;
5143 }
5145 /* Finally, allocate space. */
5147 {
5150 }
5153 }
5155 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
5156 read-only sections. */
5158 static bfd_boolean
5160 {
5168 {
5171 /* Not an error, just cut short the traversal. */
5173 }
5175 }
5177 /* Set the sizes of the dynamic sections. */
5179 static bfd_boolean
5182 {
5185 bfd_boolean relocs;
5188 #ifdef DEBUG
5190 #endif
5196 {
5197 /* Set the contents of the .interp section to the interpreter. */
5199 {
5204 }
5205 }
5212 /* Set up .got offsets for local syms, and space for local dynamic
5213 relocs. */
5215 {
5219 bfd_size_type locsymcount;
5226 {
5233 {
5236 {
5237 /* Input section has been discarded, either because
5238 it is a copy of a linkonce section or due to
5239 linker script /DISCARD/, so we'll be discarding
5240 the relocs too. */
5241 }
5245 {
5246 /* Relocations in vxworks .tls_vars sections are
5247 handled specially by the loader. */
5248 }
5250 {
5257 }
5258 }
5259 }
5271 {
5273 {
5274 /* If just an LD reloc, we'll just use
5275 htab->tlsld_got.offset. */
5278 }
5279 else
5280 {
5283 {
5290 }
5291 else
5297 }
5298 }
5299 else
5301 }
5303 /* Allocate space for global sym dynamic relocs. */
5307 {
5311 }
5312 else
5316 {
5319 /* If we haven't allocated the header, do so now. When we get here,
5320 for old plt/got the got size will be 0 to 32764 (not allocated),
5321 or 32780 to 65536 (header allocated). For new plt/got, the
5322 corresponding ranges are 0 to 32768 and 32780 to 65536. */
5324 {
5329 }
5332 }
5335 {
5337 /* Space for the branch table. */
5339 /* Pad out to align the start of PLTresolve. */
5344 {
5351 {
5360 }
5366 {
5375 }
5376 }
5377 }
5379 /* We've now determined the sizes of the various dynamic sections.
5380 Allocate memory for them. */
5383 {
5396 {
5397 /* We'd like to strip these sections if they aren't needed, but if
5398 we've exported dynamic symbols from them we must leave them.
5399 It's too late to tell BFD to get rid of the symbols. */
5402 /* Strip this section if we don't need it; see the
5403 comment below. */
5404 }
5407 {
5408 /* Strip these too. */
5409 }
5411 {
5413 {
5414 /* Remember whether there are any relocation sections. */
5417 /* We use the reloc_count field as a counter if we need
5418 to copy relocs into the output file. */
5420 }
5421 }
5422 else
5423 {
5424 /* It's not one of our sections, so don't allocate space. */
5426 }
5429 {
5430 /* If we don't need this section, strip it from the
5431 output file. This is mostly to handle .rela.bss and
5432 .rela.plt. We must create both sections in
5433 create_dynamic_sections, because they must be created
5434 before the linker maps input sections to output
5435 sections. The linker does that before
5436 adjust_dynamic_symbol is called, and it is that
5437 function which decides whether anything needs to go
5438 into these sections. */
5441 }
5446 /* Allocate memory for the section contents. */
5450 }
5453 {
5454 /* Add some entries to the .dynamic section. We fill in the
5455 values later, in ppc_elf_finish_dynamic_sections, but we
5456 must add the entries now so that we get the correct size for
5457 the .dynamic section. The DT_DEBUG entry is filled in by the
5458 dynamic linker and used by the debugger. */
5459 #define add_dynamic_entry(TAG, VAL) \
5460 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
5463 {
5466 }
5469 {
5475 }
5478 {
5481 }
5484 {
5489 }
5491 /* If any dynamic relocs apply to a read-only section, then we
5492 need a DT_TEXTREL entry. */
5495 info);
5498 {
5501 }
5505 }
5506 #undef add_dynamic_entry
5509 }
5511 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5513 static bfd_boolean
5515 {
5523 }
5524 \f
5525 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
5528 {
5537 };
5540 {
5545 };
5547 static bfd_boolean
5552 {
5553 struct one_fixup
5554 {
5557 bfd_vma toff;
5558 bfd_vma trampoff;
5559 };
5567 bfd_boolean changed;
5569 bfd_size_type trampoff;
5574 /* Nothing to do if there are no relocations, and no need to do
5575 anything with non-alloc sections. */
5582 /* Space for a branch around any trampolines. */
5587 /* Get a copy of the native relocations. */
5598 {
5610 {
5625 }
5627 /* Get the value of the symbol referred to by the reloc. */
5629 {
5630 /* A local symbol. */
5633 /* Read this BFD's local symbols. */
5635 {
5643 }
5651 else
5656 }
5657 else
5658 {
5659 /* Global symbol handling. */
5674 {
5678 {
5680 {
5683 }
5684 else
5685 {
5688 }
5689 }
5690 }
5692 ;
5695 {
5698 }
5699 else
5703 }
5705 /* If the branch and target are in the same section, you have
5706 no hope of adding stubs. We'll error out later should the
5707 branch overflow. */
5711 /* There probably isn't any reason to handle symbols in
5712 SEC_MERGE sections; SEC_MERGE doesn't seem a likely
5713 attribute for a code section, and we are only looking at
5714 branches. However, implement it correctly here as a
5715 reference for other target relax_section functions. */
5717 {
5718 /* At this stage in linking, no SEC_MERGE symbol has been
5719 adjusted, so all references to such symbols need to be
5720 passed through _bfd_merged_section_offset. (Later, in
5721 relocate_section, all SEC_MERGE symbols *except* for
5722 section symbols have been adjusted.)
5724 gas may reduce relocations against symbols in SEC_MERGE
5725 sections to a relocation against the section symbol when
5726 the original addend was zero. When the reloc is against
5727 a section symbol we should include the addend in the
5728 offset passed to _bfd_merged_section_offset, since the
5729 location of interest is the original symbol. On the
5730 other hand, an access to "sym+addend" where "sym" is not
5731 a section symbol should not include the addend; Such an
5732 access is presumed to be an offset from "sym"; The
5733 location of interest is just "sym". */
5739 toff);
5743 }
5744 /* PLTREL24 addends are special. */
5748 /* Attempted -shared link of non-pic code loses. */
5757 /* If the branch is in range, no need to do anything. */
5761 /* Look for an existing fixup to this address. */
5767 {
5773 /* Oh dear, we can't reach a trampoline. Don't try to add
5774 one. We'll report an error later. */
5778 {
5782 }
5783 else
5784 {
5788 }
5797 /* Hijack the old relocation. Since we need two
5798 relocations for this use a "composite" reloc. */
5800 stub_rtype);
5805 /* Record the fixup so we don't do it again this section. */
5814 }
5815 else
5816 {
5821 /* Nop out the reloc, since we're finalizing things here. */
5823 }
5825 /* Get the section contents. */
5827 {
5828 /* Get cached copy if it exists. */
5831 else
5832 {
5833 /* Go get them off disk. */
5836 }
5837 }
5839 /* Fix up the existing branch to hit the trampoline. */
5842 {
5860 }
5861 }
5863 /* Write out the trampolines. */
5866 {
5869 bfd_vma val;
5872 do
5873 {
5877 }
5885 /* Branch around the trampolines. */
5893 {
5896 }
5897 else
5898 {
5901 }
5905 {
5907 i++;
5911 }
5913 }
5917 {
5920 else
5921 {
5922 /* Cache the symbols for elf_link_input_bfd. */
5924 }
5925 }
5929 {
5932 else
5933 {
5934 /* Cache the section contents for elf_link_input_bfd. */
5936 }
5937 }
5940 {
5943 else
5945 }
5950 error_return:
5960 }
5961 \f
5962 /* What to do when ld finds relocations against symbols defined in
5963 discarded sections. */
5965 static unsigned int
5967 {
5975 }
5976 \f
5977 /* Fill in the address for a pointer generated in a linker section. */
5979 static bfd_vma
5983 bfd_vma relocation,
5985 {
5991 {
5992 /* Handle global symbol. */
5998 }
5999 else
6000 {
6001 /* Handle local symbol. */
6007 }
6011 lsect);
6014 /* Offset will always be a multiple of four, so use the bottom bit
6015 as a "written" flag. */
6017 {
6022 }
6028 #ifdef DEBUG
6032 #endif
6034 /* Subtract out the addend, because it will get added back in by the normal
6035 processing. */
6037 }
6039 /* The RELOCATE_SECTION function is called by the ELF backend linker
6040 to handle the relocations for a section.
6042 The relocs are always passed as Rela structures; if the section
6043 actually uses Rel structures, the r_addend field will always be
6044 zero.
6046 This function is responsible for adjust the section contents as
6047 necessary, and (if using Rela relocs and generating a
6048 relocatable output file) adjusting the reloc addend as
6049 necessary.
6051 This function does not have to worry about setting the reloc
6052 address or the reloc symbol index.
6054 LOCAL_SYMS is a pointer to the swapped in local symbols.
6056 LOCAL_SECTIONS is an array giving the section in the input file
6057 corresponding to the st_shndx field of each local symbol.
6059 The global hash table entry for the global symbols can be found
6060 via elf_sym_hashes (input_bfd).
6062 When generating relocatable output, this function must handle
6063 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
6064 going to be the section symbol corresponding to the output
6065 section, which means that the addend must be adjusted
6066 accordingly. */
6068 static bfd_boolean
6077 {
6083 Elf_Internal_Rela outrel;
6089 bfd_boolean is_vxworks_tls;
6091 #ifdef DEBUG
6097 #endif
6101 /* Initialize howto table if not already done. */
6109 /* We have to handle relocations in vxworks .tls_vars sections
6110 specially, because the dynamic loader is 'weird'. */
6117 {
6119 bfd_vma addend;
6120 bfd_reloc_status_type r;
6127 bfd_vma relocation;
6129 bfd_boolean unresolved_reloc;
6130 bfd_boolean warned;
6142 {
6148 }
6149 else
6150 {
6157 }
6160 {
6161 /* For relocs against symbols from removed linkonce sections,
6162 or sections discarded by a linker script, we just want the
6163 section contents zeroed. Avoid any special processing. */
6171 }
6174 {
6178 {
6179 /* R_PPC_PLTREL24 is rather special. If non-zero, the
6180 addend specifies the GOT pointer offset within .got2. */
6182 }
6184 }
6186 /* TLS optimizations. Replace instruction sequences and relocs
6187 based on information we collected in tls_optimize. We edit
6188 RELOCS so that --emit-relocs will output something sensible
6189 for the final instruction stream. */
6193 {
6197 {
6201 }
6202 }
6204 /* Ensure reloc mapping code below stays sane. */
6215 {
6223 {
6224 bfd_vma insn;
6231 }
6237 {
6246 else
6249 /* add -> addi. */
6255 /* load and store indexed -> dform. */
6259 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
6264 /* lwax -> lwa. */
6266 else
6273 /* Was PPC_TLS which sits on insn boundary, now
6274 PPC_TPREL16_LO which is at low-order half-word. */
6276 }
6289 {
6290 tls_gdld_hi:
6294 else
6295 {
6299 }
6301 }
6314 {
6316 bfd_vma offset;
6318 tls_ldgd_opt:
6323 {
6324 /* IE */
6334 }
6335 else
6336 {
6337 /* LE */
6341 {
6342 /* Was an LD reloc. */
6345 r_symndx++)
6355 }
6359 R_PPC_TPREL16_LO);
6362 }
6367 {
6368 /* We changed the symbol on an LD reloc. Start over
6369 in order to get h, sym, sec etc. right. */
6370 rel--;
6372 }
6373 }
6375 }
6377 /* Handle other relocations that tweak non-addend part of insn. */
6380 {
6384 /* Branch taken prediction relocations. */
6388 /* Fall thru */
6390 /* Branch not taken prediction relocations. */
6401 /* Invert 'y' bit if not the default. */
6407 }
6415 {
6432 /* GOT16 relocations. Like an ADDR16 using the symbol's
6433 address in the GOT as relocation value instead of the
6434 symbol's value itself. Also, create a GOT entry for the
6435 symbol and put the symbol value there. */
6468 dogot:
6469 {
6470 /* Relocation is to the entry for this symbol in the global
6471 offset table. */
6472 bfd_vma off;
6485 {
6486 bfd_boolean dyn;
6491 /* This is actually a static link, or it is a
6492 -Bsymbolic link and the symbol is defined
6493 locally, or the symbol was forced to be local
6494 because of a version file. */
6495 ;
6496 else
6497 {
6500 }
6502 }
6503 else
6504 {
6508 }
6510 /* The offset must always be a multiple of 4. We use the
6511 least significant bit to record whether we have already
6512 processed this entry. */
6516 else
6517 {
6528 /* We might have multiple got entries for this sym.
6529 Initialize them all. */
6530 do
6531 {
6535 {
6538 }
6540 {
6543 }
6545 {
6548 }
6550 {
6553 }
6555 /* Generate relocs for the dynamic linker. */
6560 {
6566 {
6569 {
6576 outrel.r_info
6578 }
6579 }
6586 else
6589 {
6593 }
6598 }
6600 /* Init the .got section contents if we're not
6601 emitting a reloc. */
6602 else
6603 {
6609 {
6615 {
6619 }
6620 }
6623 }
6628 }
6633 }
6639 {
6641 {
6647 {
6651 {
6654 }
6655 }
6656 }
6657 }
6662 /* Addends on got relocations don't make much sense.
6663 x+off@got is actually x@got+off, and since the got is
6664 generated by a hash table traversal, the value in the
6665 got at entry m+n bears little relation to the entry m. */
6669 input_bfd,
6670 input_section,
6673 sym_name);
6674 }
6677 /* Relocations that need no special processing. */
6679 /* It makes no sense to point a local relocation
6680 at a symbol not in this object. */
6682 {
6685 input_bfd,
6686 input_section,
6688 TRUE))
6691 }
6701 /* Relocations that may need to be propagated if this is a shared
6702 object. */
6708 /* The TPREL16 relocs shouldn't really be used in shared
6709 libs as they will result in DT_TEXTREL being set, but
6710 support them anyway. */
6735 /* fall through */
6750 /* If these relocations are not to a named symbol, they can be
6751 handled right here, no need to bother the dynamic linker. */
6755 /* fall through */
6763 /* fall through */
6765 dodyn:
6779 || (ELIMINATE_COPY_RELOCS
6785 {
6788 #ifdef DEBUG
6793 #endif
6795 /* When generating a shared object, these relocations
6796 are copied into the output file to be resolved at run
6797 time. */
6799 {
6802 name = (bfd_elf_string_from_elf_section
6811 input_section),
6816 }
6834 {
6838 }
6839 else
6840 {
6845 else
6846 {
6850 ;
6852 {
6855 }
6856 else
6857 {
6860 /* We are turning this relocation into one
6861 against a section symbol. It would be
6862 proper to subtract the symbol's value,
6863 osec->vma, from the emitted reloc addend,
6864 but ld.so expects buggy relocs. */
6868 {
6871 }
6873 #ifdef DEBUG
6878 #endif
6879 }
6882 }
6883 }
6892 /* This reloc will be computed at runtime. We clear the memory
6893 so that it contains predictable value. */
6897 {
6901 }
6902 }
6907 {
6914 else
6918 }
6921 /* Fall thru */
6927 /* Fall thru */
6930 relax32:
6931 {
6938 /* We're clearing the bits for R_PPC_ADDR16_HA
6939 and R_PPC_ADDR16_LO here. */
6943 /* t0 is HA, t1 is LO */
6950 }
6953 /* Indirect .sdata relocation. */
6956 relocation
6961 /* Indirect .sdata2 relocation. */
6964 relocation
6969 /* Handle the TOC16 reloc. We want to use the offset within the .got
6970 section, not the actual VMA. This is appropriate when generating
6971 an embedded ELF object, for which the .got section acts like the
6972 AIX .toc section. */
6983 /* Relocation is to the entry for this symbol in the
6984 procedure linkage table. */
6985 {
6991 {
6992 /* We didn't make a PLT entry for this symbol. This
6993 happens when statically linking PIC code, or when
6994 using -Bsymbolic. */
6996 }
7003 else
7007 }
7010 /* Relocate against _SDA_BASE_. */
7012 {
7022 {
7026 input_bfd,
7027 sym_name,
7029 name);
7030 }
7035 }
7038 /* Relocate against _SDA2_BASE_. */
7040 {
7048 {
7052 input_bfd,
7053 sym_name,
7055 name);
7060 }
7065 }
7068 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
7071 {
7082 {
7088 }
7092 {
7098 }
7102 {
7104 }
7106 else
7107 {
7111 input_bfd,
7112 sym_name,
7114 name);
7119 }
7126 }
7127 }
7130 /* Relocate against the beginning of the section. */
7139 /* Negative relocations. */
7165 input_bfd,
7167 sym_name);
7172 }
7174 /* Do any further special processing. */
7176 {
7187 /* It's just possible that this symbol is a weak symbol
7188 that's not actually defined anywhere. In that case,
7189 'sec' would be NULL, and we should leave the symbol
7190 alone (it will be set to zero elsewhere in the link). */
7193 /* Fall thru */
7201 /* Add 0x10000 if sign bit in 0:15 is set.
7202 Bits 0:15 are not used. */
7205 }
7207 #ifdef DEBUG
7212 sym_name,
7213 r_symndx,
7216 #endif
7221 {
7224 input_bfd,
7225 input_section,
7228 sym_name);
7230 }
7233 input_bfd,
7234 input_section,
7235 contents,
7237 relocation,
7238 addend);
7241 {
7243 {
7249 {
7250 /* Assume this is a call protected by other code that
7251 detect the symbol is undefined. If this is the case,
7252 we can safely ignore the overflow. If not, the
7253 program is hosed anyway, and a little warning isn't
7254 going to help. */
7257 }
7261 sym_name,
7264 input_bfd,
7265 input_section,
7268 }
7269 else
7270 {
7276 }
7277 }
7278 }
7280 #ifdef DEBUG
7282 #endif
7285 }
7286 \f
7287 #define PPC_LO(v) ((v) & 0xffff)
7288 #define PPC_HI(v) (((v) >> 16) & 0xffff)
7289 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
7291 /* Finish up dynamic symbol handling. We set the contents of various
7292 dynamic sections here. */
7294 static bfd_boolean
7299 {
7302 bfd_boolean doneone;
7304 #ifdef DEBUG
7307 #endif
7315 {
7317 {
7318 Elf_Internal_Rela rela;
7320 bfd_vma reloc_index;
7324 else
7325 {
7331 }
7333 /* This symbol has an entry in the procedure linkage table.
7334 Set it up. */
7336 {
7337 bfd_vma got_offset;
7340 /* The first three entries in .got.plt are reserved. */
7343 /* Use the right PLT. */
7347 /* Fill in the .plt on VxWorks. */
7349 {
7359 }
7360 else
7361 {
7362 bfd_vma got_loc
7363 = (got_offset
7376 }
7383 /* This instruction is an immediate load. The value loaded is
7384 the byte offset of the R_PPC_JMP_SLOT relocation from the
7385 start of the .rela.plt section. The value is stored in the
7386 low-order 16 bits of the load instruction. */
7387 /* NOTE: It appears that this is now an index rather than a
7388 prescaled offset. */
7392 /* This instruction is a PC-relative branch whose target is
7393 the start of the PLT section. The address of this branch
7394 instruction is 20 bytes beyond the start of this PLT entry.
7395 The address is encoded in bits 6-29, inclusive. The value
7396 stored is right-shifted by two bits, permitting a 26-bit
7397 offset. */
7407 /* Fill in the GOT entry corresponding to this PLT slot with
7408 the address immediately after the the "bctr" instruction
7409 in this PLT entry. */
7416 {
7417 /* Fill in a couple of entries in .rela.plt.unloaded. */
7423 /* Provide the @ha relocation for the first instruction. */
7428 R_PPC_ADDR16_HA);
7433 /* Provide the @l relocation for the second instruction. */
7438 R_PPC_ADDR16_LO);
7443 /* Provide a relocation for the GOT entry corresponding to this
7444 PLT slot. Point it at the middle of the .plt entry. */
7449 R_PPC_ADDR32);
7452 }
7454 /* VxWorks uses non-standard semantics for R_PPC_JMP_SLOT.
7455 In particular, the offset for the relocation is not the
7456 address of the PLT entry for this function, as specified
7457 by the ABI. Instead, the offset is set to the address of
7458 the GOT slot for this function. See EABI 4.4.4.1. */
7463 }
7464 else
7465 {
7470 {
7471 /* We don't need to fill in the .plt. The ppc dynamic
7472 linker will fill it in. */
7473 }
7474 else
7475 {
7481 }
7482 }
7484 /* Fill in the entry in the .rela.plt section. */
7493 {
7494 /* Mark the symbol as undefined, rather than as
7495 defined in the .plt section. Leave the value if
7496 there were any relocations where pointer equality
7497 matters (this is a clue for the dynamic linker, to
7498 make function pointer comparisons work between an
7499 application and shared library), otherwise set it
7500 to zero. */
7505 {
7506 /* This breaks function pointer comparisons, but
7507 that is better than breaking tests for a NULL
7508 function pointer. */
7510 }
7511 }
7513 }
7516 {
7517 bfd_vma plt;
7526 {
7541 {
7550 }
7551 else
7552 {
7561 }
7562 }
7563 else
7564 {
7574 /* We only need one non-PIC glink stub. */
7576 }
7577 }
7578 else
7580 }
7583 {
7585 Elf_Internal_Rela rela;
7588 /* This symbols needs a copy reloc. Set it up. */
7590 #ifdef DEBUG
7592 #endif
7598 else
7609 }
7611 #ifdef DEBUG
7613 #endif
7615 /* Mark some specially defined symbols as absolute. */
7624 }
7625 \f
7626 static enum elf_reloc_type_class
7628 {
7630 {
7641 }
7642 }
7643 \f
7644 /* Finish up the dynamic sections. */
7646 static bfd_boolean
7649 {
7653 bfd_vma got;
7656 #ifdef DEBUG
7658 #endif
7665 else
7675 {
7683 {
7684 Elf_Internal_Dyn dyn;
7690 {
7694 else
7714 {
7718 }
7726 }
7729 }
7730 }
7732 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
7733 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
7735 {
7737 bfd_vma val;
7749 }
7751 /* Fill in the first entry in the VxWorks procedure linkage table. */
7753 {
7754 /* Use the right PLT. */
7760 {
7761 bfd_vma got_value =
7771 }
7772 else
7773 {
7776 }
7785 {
7786 Elf_Internal_Rela rela;
7791 /* Output the @ha relocation for the first instruction. */
7800 /* Output the @l relocation for the second instruction. */
7809 /* Fix up the remaining relocations. They may have the wrong
7810 symbol index for _G_O_T_ or _P_L_T_ depending on the order
7811 in which symbols were output. */
7813 {
7814 Elf_Internal_Rela rel;
7830 }
7831 }
7832 }
7835 {
7838 bfd_vma res0;
7841 /*
7842 * PIC glink code is the following:
7843 *
7844 * # ith PLT code stub.
7845 * addis 11,30,(plt+(i-1)*4-got)@ha
7846 * lwz 11,(plt+(i-1)*4-got)@l(11)
7847 * mtctr 11
7848 * bctr
7849 *
7850 * # A table of branches, one for each plt entry.
7851 * # The idea is that the plt call stub loads ctr and r11 with these
7852 * # addresses, so (r11 - res_0) gives the plt index * 4.
7853 * res_0: b PLTresolve
7854 * res_1: b PLTresolve
7855 * .
7856 * # Some number of entries towards the end can be nops
7857 * res_n_m3: nop
7858 * res_n_m2: nop
7859 * res_n_m1:
7860 *
7861 * PLTresolve:
7862 * addis 11,11,(1f-res_0)@ha
7863 * mflr 0
7864 * bcl 20,31,1f
7865 * 1: addi 11,11,(1b-res_0)@l
7866 * mflr 12
7867 * mtlr 0
7868 * sub 11,11,12 # r11 = index * 4
7869 * addis 12,12,(got+4-1b)@ha
7870 * lwz 0,(got+4-1b)@l(12) # got[1] address of dl_runtime_resolve
7871 * lwz 12,(got+8-1b)@l(12) # got[2] contains the map address
7872 * mtctr 0
7873 * add 0,11,11
7874 * add 11,0,11 # r11 = index * 12 = reloc offset.
7875 * bctr
7876 */
7878 {
7879 ADDIS_11_11,
7880 MFLR_0,
7881 BCL_20_31,
7882 ADDI_11_11,
7883 MFLR_12,
7884 MTLR_0,
7885 SUB_11_11_12,
7886 ADDIS_12_12,
7887 LWZ_0_12,
7888 LWZ_12_12,
7889 MTCTR_0,
7890 ADD_0_11_11,
7891 ADD_11_0_11,
7892 BCTR,
7893 NOP,
7894 NOP
7895 };
7897 /*
7898 * Non-PIC glink code is a little simpler.
7899 *
7900 * # ith PLT code stub.
7901 * lis 11,(plt+(i-1)*4)@ha
7902 * lwz 11,(plt+(i-1)*4)@l(11)
7903 * mtctr 11
7904 * bctr
7905 *
7906 * The branch table is the same, then comes
7907 *
7908 * PLTresolve:
7909 * lis 12,(got+4)@ha
7910 * addis 11,11,(-res_0)@ha
7911 * lwz 0,(got+4)@l(12) # got[1] address of dl_runtime_resolve
7912 * addi 11,11,(-res_0)@l # r11 = index * 4
7913 * mtctr 0
7914 * add 0,11,11
7915 * lwz 12,(got+8)@l(12) # got[2] contains the map address
7916 * add 11,0,11 # r11 = index * 12 = reloc offset.
7917 * bctr
7918 */
7920 {
7921 LIS_12,
7922 ADDIS_11_11,
7923 LWZ_0_12,
7924 ADDI_11_11,
7925 MTCTR_0,
7926 ADD_0_11_11,
7927 LWZ_12_12,
7928 ADD_11_0_11,
7929 BCTR,
7930 NOP,
7931 NOP,
7932 NOP,
7933 NOP,
7934 NOP,
7935 NOP,
7936 NOP
7937 };
7944 /* Build the branch table, one for each plt entry (less one),
7945 and perhaps some padding. */
7951 {
7954 }
7956 {
7959 }
7965 /* Last comes the PLTresolve stub. */
7967 {
7968 bfd_vma bcl;
7971 {
7974 }
7988 {
7993 }
7994 else
7995 {
8000 }
8001 }
8002 else
8003 {
8005 {
8008 }
8018 {
8023 }
8024 else
8025 {
8030 }
8031 }
8032 }
8035 }
8036 \f
8037 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
8039 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
8041 #define ELF_ARCH bfd_arch_powerpc
8042 #define ELF_MACHINE_CODE EM_PPC
8043 #ifdef __QNXTARGET__
8044 #define ELF_MAXPAGESIZE 0x1000
8045 #else
8046 #define ELF_MAXPAGESIZE 0x10000
8047 #endif
8048 #define ELF_MINPAGESIZE 0x1000
8049 #define ELF_COMMONPAGESIZE 0x1000
8050 #define elf_info_to_howto ppc_elf_info_to_howto
8052 #ifdef EM_CYGNUS_POWERPC
8053 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
8054 #endif
8056 #ifdef EM_PPC_OLD
8057 #define ELF_MACHINE_ALT2 EM_PPC_OLD
8058 #endif
8060 #define elf_backend_plt_not_loaded 1
8061 #define elf_backend_can_gc_sections 1
8062 #define elf_backend_can_refcount 1
8063 #define elf_backend_rela_normal 1
8065 #define bfd_elf32_mkobject ppc_elf_mkobject
8066 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
8067 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
8068 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
8069 #define bfd_elf32_bfd_reloc_name_lookup ppc_elf_reloc_name_lookup
8070 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
8071 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create
8072 #define bfd_elf32_get_synthetic_symtab ppc_elf_get_synthetic_symtab
8074 #define elf_backend_object_p ppc_elf_object_p
8075 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
8076 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
8077 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
8078 #define elf_backend_relocate_section ppc_elf_relocate_section
8079 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
8080 #define elf_backend_check_relocs ppc_elf_check_relocs
8081 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol
8082 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
8083 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
8084 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
8085 #define elf_backend_hash_symbol ppc_elf_hash_symbol
8086 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
8087 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
8088 #define elf_backend_fake_sections ppc_elf_fake_sections
8089 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
8090 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
8091 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
8092 #define elf_backend_write_core_note ppc_elf_write_core_note
8093 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
8094 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing
8095 #define elf_backend_final_write_processing ppc_elf_final_write_processing
8096 #define elf_backend_write_section ppc_elf_write_section
8097 #define elf_backend_get_sec_type_attr ppc_elf_get_sec_type_attr
8098 #define elf_backend_plt_sym_val ppc_elf_plt_sym_val
8099 #define elf_backend_action_discarded ppc_elf_action_discarded
8100 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
8104 /* VxWorks Target */
8106 #undef TARGET_LITTLE_SYM
8107 #undef TARGET_LITTLE_NAME
8109 #undef TARGET_BIG_SYM
8110 #define TARGET_BIG_SYM bfd_elf32_powerpc_vxworks_vec
8111 #undef TARGET_BIG_NAME
8114 /* VxWorks uses the elf default section flags for .plt. */
8117 {
8125 }
8127 /* Like ppc_elf_link_hash_table_create, but overrides
8128 appropriately for VxWorks. */
8131 {
8136 {
8144 }
8146 }
8148 /* Tweak magic VxWorks symbols as they are loaded. */
8149 static bfd_boolean
8157 {
8159 valp))
8163 }
8165 static void
8167 {
8170 }
8172 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
8173 define it. */
8174 #undef elf_backend_want_plt_sym
8175 #define elf_backend_want_plt_sym 1
8176 #undef elf_backend_want_got_plt
8177 #define elf_backend_want_got_plt 1
8178 #undef elf_backend_got_symbol_offset
8179 #define elf_backend_got_symbol_offset 0
8180 #undef elf_backend_plt_not_loaded
8181 #define elf_backend_plt_not_loaded 0
8182 #undef elf_backend_plt_readonly
8183 #define elf_backend_plt_readonly 1
8184 #undef elf_backend_got_header_size
8185 #define elf_backend_got_header_size 12
8187 #undef bfd_elf32_get_synthetic_symtab
8189 #undef bfd_elf32_bfd_link_hash_table_create
8190 #define bfd_elf32_bfd_link_hash_table_create \
8191 ppc_elf_vxworks_link_hash_table_create
8192 #undef elf_backend_add_symbol_hook
8193 #define elf_backend_add_symbol_hook \
8194 ppc_elf_vxworks_add_symbol_hook
8195 #undef elf_backend_link_output_symbol_hook
8196 #define elf_backend_link_output_symbol_hook \
8197 elf_vxworks_link_output_symbol_hook
8198 #undef elf_backend_final_write_processing
8199 #define elf_backend_final_write_processing \
8200 ppc_elf_vxworks_final_write_processing
8201 #undef elf_backend_get_sec_type_attr
8202 #define elf_backend_get_sec_type_attr \
8203 ppc_elf_vxworks_get_sec_type_attr
8204 #undef elf_backend_emit_relocs
8205 #define elf_backend_emit_relocs \
8206 elf_vxworks_emit_relocs
8208 #undef elf32_bed
8209 #define elf32_bed ppc_elf_vxworks_bed