| blob | b04bea43ec61eff9678e013d71a078979b7ae968 |
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
161 /* The value of a defined global symbol. */
162 #define SYM_VAL(SYM) \
163 ((SYM)->root.u.def.section->output_section->vma \
164 + (SYM)->root.u.def.section->output_offset \
165 + (SYM)->root.u.def.value)
166 \f
170 /* This reloc does nothing. */
185 /* A standard 32 bit relocation. */
200 /* An absolute 26 bit branch; the lower two bits must be zero.
201 FIXME: we don't check that, we just clear them. */
216 /* A standard 16 bit relocation. */
231 /* A 16 bit relocation without overflow. */
246 /* The high order 16 bits of an address. */
261 /* The high order 16 bits of an address, plus 1 if the contents of
262 the low 16 bits, treated as a signed number, is negative. */
277 /* An absolute 16 bit branch; the lower two bits must be zero.
278 FIXME: we don't check that, we just clear them. */
293 /* An absolute 16 bit branch, for which bit 10 should be set to
294 indicate that the branch is expected to be taken. The lower two
295 bits must be zero. */
310 /* An absolute 16 bit branch, for which bit 10 should be set to
311 indicate that the branch is not expected to be taken. The lower
312 two bits must be zero. */
327 /* A relative 26 bit branch; the lower two bits must be zero. */
342 /* A relative 16 bit branch; the lower two bits must be zero. */
357 /* A relative 16 bit branch. Bit 10 should be set to indicate that
358 the branch is expected to be taken. The lower two bits must be
359 zero. */
374 /* A relative 16 bit branch. Bit 10 should be set to indicate that
375 the branch is not expected to be taken. The lower two bits must
376 be zero. */
391 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the
392 symbol. */
407 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
408 the symbol. */
423 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
424 the symbol. */
439 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
440 the symbol. */
455 /* Like R_PPC_REL24, but referring to the procedure linkage table
456 entry for the symbol. */
471 /* This is used only by the dynamic linker. The symbol should exist
472 both in the object being run and in some shared library. The
473 dynamic linker copies the data addressed by the symbol from the
474 shared library into the object, because the object being
475 run has to have the data at some particular address. */
490 /* Like R_PPC_ADDR32, but used when setting global offset table
491 entries. */
506 /* Marks a procedure linkage table entry for a symbol. */
521 /* Used only by the dynamic linker. When the object is run, this
522 longword is set to the load address of the object, plus the
523 addend. */
538 /* Like R_PPC_REL24, but uses the value of the symbol within the
539 object rather than the final value. Normally used for
540 _GLOBAL_OFFSET_TABLE_. */
555 /* Like R_PPC_ADDR32, but may be unaligned. */
570 /* Like R_PPC_ADDR16, but may be unaligned. */
585 /* 32-bit PC relative */
600 /* 32-bit relocation to the symbol's procedure linkage table.
601 FIXME: not supported. */
616 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
617 FIXME: not supported. */
632 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
633 the symbol. */
648 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
649 the symbol. */
664 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
665 the symbol. */
680 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
681 small data items. */
696 /* 16-bit section relative relocation. */
711 /* 16-bit lower half section relative relocation. */
726 /* 16-bit upper half section relative relocation. */
741 /* 16-bit upper half adjusted section relative relocation. */
756 /* Marker reloc for TLS. */
771 /* Computes the load module index of the load module that contains the
772 definition of its TLS sym. */
787 /* Computes a dtv-relative displacement, the difference between the value
788 of sym+add and the base address of the thread-local storage block that
789 contains the definition of sym, minus 0x8000. */
804 /* A 16 bit dtprel reloc. */
819 /* Like DTPREL16, but no overflow. */
834 /* Like DTPREL16_LO, but next higher group of 16 bits. */
849 /* Like DTPREL16_HI, but adjust for low 16 bits. */
864 /* Computes a tp-relative displacement, the difference between the value of
865 sym+add and the value of the thread pointer (r13). */
880 /* A 16 bit tprel reloc. */
895 /* Like TPREL16, but no overflow. */
910 /* Like TPREL16_LO, but next higher group of 16 bits. */
925 /* Like TPREL16_HI, but adjust for low 16 bits. */
940 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
941 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset
942 to the first entry. */
957 /* Like GOT_TLSGD16, but no overflow. */
972 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */
987 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */
1002 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
1003 with values (sym+add)@dtpmod and zero, and computes the offset to the
1004 first entry. */
1019 /* Like GOT_TLSLD16, but no overflow. */
1034 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */
1049 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */
1064 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes
1065 the offset to the entry. */
1080 /* Like GOT_DTPREL16, but no overflow. */
1095 /* Like GOT_DTPREL16_LO, but next higher group of 16 bits. */
1110 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */
1125 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the
1126 offset to the entry. */
1141 /* Like GOT_TPREL16, but no overflow. */
1156 /* Like GOT_TPREL16_LO, but next higher group of 16 bits. */
1171 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */
1186 /* The remaining relocs are from the Embedded ELF ABI, and are not
1187 in the SVR4 ELF ABI. */
1189 /* 32 bit value resulting from the addend minus the symbol. */
1204 /* 16 bit value resulting from the addend minus the symbol. */
1219 /* 16 bit value resulting from the addend minus the symbol. */
1234 /* The high order 16 bits of the addend minus the symbol. */
1249 /* The high order 16 bits of the result of the addend minus the address,
1250 plus 1 if the contents of the low 16 bits, treated as a signed number,
1251 is negative. */
1266 /* 16 bit value resulting from allocating a 4 byte word to hold an
1267 address in the .sdata section, and returning the offset from
1268 _SDA_BASE_ for that relocation. */
1283 /* 16 bit value resulting from allocating a 4 byte word to hold an
1284 address in the .sdata2 section, and returning the offset from
1285 _SDA2_BASE_ for that relocation. */
1300 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
1301 small data items. */
1316 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
1317 signed offset from the appropriate base, and filling in the register
1318 field with the appropriate register (0, 2, or 13). */
1333 /* Relocation not handled: R_PPC_EMB_MRKREF */
1334 /* Relocation not handled: R_PPC_EMB_RELSEC16 */
1335 /* Relocation not handled: R_PPC_EMB_RELST_LO */
1336 /* Relocation not handled: R_PPC_EMB_RELST_HI */
1337 /* Relocation not handled: R_PPC_EMB_RELST_HA */
1338 /* Relocation not handled: R_PPC_EMB_BIT_FLD */
1340 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
1341 in the 16 bit signed offset from the appropriate base, and filling in the
1342 register field with the appropriate register (0, 2, or 13). */
1357 /* A 16 bit relative relocation. */
1372 /* A 16 bit relative relocation without overflow. */
1387 /* The high order 16 bits of a relative address. */
1402 /* The high order 16 bits of a relative address, plus 1 if the contents of
1403 the low 16 bits, treated as a signed number, is negative. */
1418 /* GNU extension to record C++ vtable hierarchy. */
1433 /* GNU extension to record C++ vtable member usage. */
1448 /* Phony reloc to handle AIX style TOC entries. */
1462 };
1463 \f
1464 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
1466 static void
1468 {
1473 i++)
1474 {
1480 }
1481 }
1485 bfd_reloc_code_real_type code)
1486 {
1489 /* Initialize howto table if not already done. */
1494 {
1583 }
1586 };
1591 {
1596 i++)
1602 }
1604 /* Set the howto pointer for a PowerPC ELF reloc. */
1606 static void
1610 {
1611 /* Initialize howto table if not already done. */
1618 /* Just because the above assert didn't trigger doesn't mean that
1619 ELF32_R_TYPE (dst->r_info) is necessarily a valid relocation. */
1621 {
1627 }
1628 }
1630 /* Handle the R_PPC_ADDR16_HA and R_PPC_REL16_HA relocs. */
1632 static bfd_reloc_status_type
1640 {
1641 bfd_vma relocation;
1644 {
1647 }
1654 else
1666 }
1668 static bfd_reloc_status_type
1676 {
1677 /* If this is a relocatable link (output_bfd test tells us), just
1678 call the generic function. Any adjustment will be done at final
1679 link time. */
1685 {
1690 }
1692 }
1693 \f
1694 /* Sections created by the linker. */
1697 {
1698 /* Pointer to the bfd section. */
1700 /* Section name. */
1702 /* Associated bss section name. */
1704 /* Associated symbol name. */
1706 /* Associated symbol. */
1710 /* Linked list of allocated pointer entries. This hangs off of the
1711 symbol lists, and provides allows us to return different pointers,
1712 based on different addend's. */
1715 {
1716 /* next allocated pointer for this symbol */
1718 /* offset of pointer from beginning of section */
1719 bfd_vma offset;
1720 /* addend used */
1721 bfd_vma addend;
1722 /* which linker section this is */
1726 struct ppc_elf_obj_tdata
1727 {
1730 /* A mapping from local symbols to offsets into the various linker
1731 sections added. This is index by the symbol index. */
1734 /* Flags used to auto-detect plt type. */
1737 };
1739 #define ppc_elf_tdata(bfd) \
1740 ((struct ppc_elf_obj_tdata *) (bfd)->tdata.any)
1742 #define elf_local_ptr_offsets(bfd) \
1743 (ppc_elf_tdata (bfd)->linker_section_pointers)
1745 #define is_ppc_elf(bfd) \
1746 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
1747 && elf_object_id (bfd) == PPC32_ELF_TDATA)
1749 /* Override the generic function because we store some extras. */
1751 static bfd_boolean
1753 {
1755 PPC32_ELF_TDATA);
1756 }
1758 /* Fix bad default arch selected for a 32 bit input bfd when the
1759 default is 64 bit. */
1761 static bfd_boolean
1763 {
1765 {
1769 {
1770 /* Relies on arch after 64 bit default being 32 bit default. */
1773 }
1774 }
1776 }
1778 /* Function to set whether a module needs the -mrelocatable bit set. */
1780 static bfd_boolean
1782 {
1789 }
1791 /* Support for core dump NOTE sections. */
1793 static bfd_boolean
1795 {
1800 {
1805 /* pr_cursig */
1808 /* pr_pid */
1811 /* pr_reg */
1816 }
1818 /* Make a ".reg/999" section. */
1821 }
1823 static bfd_boolean
1825 {
1827 {
1836 }
1838 /* Note that for some reason, a spurious space is tacked
1839 onto the end of the args in some (at least one anyway)
1840 implementations, so strip it off if it exists. */
1842 {
1848 }
1851 }
1855 {
1857 {
1862 {
1873 }
1876 {
1895 }
1896 }
1897 }
1899 /* Return address for Ith PLT stub in section PLT, for relocation REL
1900 or (bfd_vma) -1 if it should not be included. */
1902 static bfd_vma
1906 {
1908 }
1910 /* Handle a PowerPC specific section when reading an object file. This
1911 is called when bfd_section_from_shdr finds a section with an unknown
1912 type. */
1914 static bfd_boolean
1919 {
1921 flagword flags;
1936 }
1938 /* Set up any other section flags and such that may be necessary. */
1940 static bfd_boolean
1944 {
1952 }
1954 /* If we have .sbss2 or .PPC.EMB.sbss0 output sections, we
1955 need to bump up the number of section headers. */
1957 static int
1960 {
1973 }
1975 /* Add extra PPC sections -- Note, for now, make .sbss2 and
1976 .PPC.EMB.sbss0 a normal section, and not a bss section so
1977 that the linker doesn't crater when trying to make more than
1978 2 sections. */
1981 {
1992 };
1994 /* This is what we want for new plt/got. */
2000 {
2003 /* See if this is one of the special sections. */
2010 {
2014 }
2017 }
2018 \f
2019 /* Very simple linked list structure for recording apuinfo values. */
2021 {
2024 }
2025 apuinfo_list;
2030 static void
2032 {
2034 }
2036 static void
2038 {
2042 {
2046 }
2055 }
2057 static unsigned
2059 {
2064 entry;
2069 }
2073 {
2079 ;
2082 }
2084 static void
2086 {
2090 {
2094 }
2097 }
2102 /* Scan the input BFDs and create a linked list of
2103 the APUinfo values that will need to be emitted. */
2105 static void
2107 {
2112 bfd_size_type output_section_size;
2122 /* Scan the input bfds, looking for apuinfo sections. */
2127 {
2130 {
2133 }
2134 }
2136 /* We need at least one input sections
2137 in order to make merging worthwhile. */
2141 /* Just make sure that the output section exists as well. */
2146 /* Allocate a buffer for the contents of the input sections. */
2154 /* Read in the input sections contents. */
2156 {
2166 {
2169 }
2173 {
2176 }
2178 /* Process the contents of the section. */
2182 /* Verify the contents of the header. Note - we have to
2183 extract the values this way in order to allow for a
2184 host whose endian-ness is different from the target. */
2196 /* Get the number of bytes used for apuinfo entries. */
2201 /* Make sure that we do not run off the end of the section. */
2205 /* Scan the apuinfo section, building a list of apuinfo numbers. */
2209 /* Update the offset. */
2211 }
2215 /* Compute the size of the output section. */
2225 fail:
2230 }
2232 /* Prevent the output section from accumulating the input sections'
2233 contents. We have already stored this in our linked list structure. */
2235 static bfd_boolean
2240 {
2243 }
2245 /* Finally we can generate the output section. */
2247 static void
2249 {
2254 bfd_size_type length;
2269 {
2273 }
2275 /* Create the apuinfo header. */
2284 {
2287 }
2298 }
2299 \f
2300 static bfd_boolean
2302 {
2321 }
2323 static bfd_boolean
2325 {
2330 }
2332 static long
2336 {
2341 bfd_vma stub_vma;
2365 /* Call common code to handle old-style executable PLTs. */
2370 /* If this object was prelinked, the prelinker stored the address
2371 of .glink at got[1]. If it wasn't prelinked, got[1] will be zero. */
2374 {
2388 {
2389 Elf_Internal_Dyn dyn;
2396 {
2404 }
2405 }
2407 }
2409 /* Otherwise we read the first plt entry. */
2411 {
2414 }
2419 /* The .glink section usually does not survive the final
2420 link; search for the section (usually .text) where the
2421 glink stubs now reside. */
2426 /* Determine glink PLT resolver by reading the relative branch
2427 from the first glink stub. */
2430 {
2433 /* The first glink stub may either branch to the resolver ... */
2438 /* ... or fall through a bunch of NOPs. */
2445 {
2448 }
2449 }
2453 /* If the stubs are those for -shared/-pie then we might have
2454 multiple stubs for each plt entry. If that is the case then
2455 there is no way to associate stubs with their plt entries short
2456 of figuring out the GOT pointer value used in the stub. */
2484 {
2488 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
2489 we are defining a symbol, ensure one of them is set. */
2504 }
2506 /* Add a symbol at the start of the glink branch table. */
2515 s++;
2516 count++;
2519 {
2520 /* Add a symbol for the glink PLT resolver. */
2529 s++;
2530 count++;
2531 }
2534 }
2535 \f
2536 /* The following functions are specific to the ELF linker, while
2537 functions above are used generally. They appear in this file more
2538 or less in the order in which they are called. eg.
2539 ppc_elf_check_relocs is called early in the link process,
2540 ppc_elf_finish_dynamic_sections is one of the last functions
2541 called. */
2543 /* The PPC linker needs to keep track of the number of relocs that it
2544 decides to copy as dynamic relocs in check_relocs for each symbol.
2545 This is so that it can later discard them if they are found to be
2546 unnecessary. We store the information in a field extending the
2547 regular ELF linker hash table. */
2549 struct ppc_elf_dyn_relocs
2550 {
2553 /* The input section of the reloc. */
2556 /* Total number of relocs copied for the input section. */
2557 bfd_size_type count;
2559 /* Number of pc-relative relocs copied for the input section. */
2560 bfd_size_type pc_count;
2561 };
2563 /* Track PLT entries needed for a given symbol. We might need more
2564 than one glink entry per symbol. */
2565 struct plt_entry
2566 {
2569 /* -fPIC uses multiple GOT sections, one per file, called ".got2".
2570 This field stores the offset into .got2 used to initialise the
2571 GOT pointer reg. It will always be at least 32768 (and for
2572 current gcc this is the only offset used). */
2573 bfd_vma addend;
2575 /* The .got2 section. */
2578 /* PLT refcount or offset. */
2579 union
2580 {
2581 bfd_signed_vma refcount;
2582 bfd_vma offset;
2585 /* .glink stub offset. */
2586 bfd_vma glink_offset;
2587 };
2589 /* Of those relocs that might be copied as dynamic relocs, this function
2590 selects those that must be copied when linking a shared library,
2591 even when the symbol is local. */
2593 static int
2596 {
2598 {
2615 }
2616 }
2618 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
2619 copying dynamic variables from a shared lib into an app's dynbss
2620 section, and instead use a dynamic relocation to point into the
2621 shared lib. */
2622 #define ELIMINATE_COPY_RELOCS 1
2624 /* PPC ELF linker hash entry. */
2626 struct ppc_elf_link_hash_entry
2627 {
2630 /* If this symbol is used in the linker created sections, the processor
2631 specific backend uses this field to map the field into the offset
2632 from the beginning of the section. */
2635 /* Track dynamic relocs copied for this symbol. */
2638 /* Contexts in which symbol is used in the GOT (or TOC).
2639 TLS_GD .. TLS_TLS bits are or'd into the mask as the
2640 corresponding relocs are encountered during check_relocs.
2641 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
2642 indicate the corresponding GOT entry type is not needed. */
2651 /* Nonzero if we have seen a small data relocation referring to this
2652 symbol. */
2654 };
2656 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent))
2658 /* PPC ELF linker hash table. */
2660 struct ppc_elf_link_hash_table
2661 {
2664 /* Short-cuts to get to dynamic linker sections. */
2677 /* The (unloaded but important) .rela.plt.unloaded on VxWorks. */
2680 /* The .got.plt section (VxWorks only)*/
2683 /* Shortcut to __tls_get_addr. */
2686 /* The bfd that forced an old-style PLT. */
2689 /* TLS local dynamic got entry handling. */
2691 bfd_signed_vma refcount;
2692 bfd_vma offset;
2695 /* Offset of PltResolve function in glink. */
2696 bfd_vma glink_pltresolve;
2698 /* Size of reserved GOT entries. */
2700 /* Non-zero if allocating the header left a gap. */
2703 /* The type of PLT we have chosen to use. */
2706 /* Set if we should emit symbols for stubs. */
2709 /* True if the target system is VxWorks. */
2712 /* The size of PLT entries. */
2714 /* The distance between adjacent PLT slots. */
2716 /* The size of the first PLT entry. */
2719 /* Small local sym to section mapping cache. */
2721 };
2723 /* Get the PPC ELF linker hash table from a link_info structure. */
2725 #define ppc_elf_hash_table(p) \
2726 ((struct ppc_elf_link_hash_table *) (p)->hash)
2728 /* Create an entry in a PPC ELF linker hash table. */
2734 {
2735 /* Allocate the structure if it has not already been allocated by a
2736 subclass. */
2738 {
2743 }
2745 /* Call the allocation method of the superclass. */
2748 {
2752 }
2755 }
2757 /* Create a PPC ELF linker hash table. */
2761 {
2769 ppc_elf_link_hash_newfunc,
2771 {
2774 }
2794 }
2796 /* Create .got and the related sections. */
2798 static bfd_boolean
2800 {
2803 flagword flags;
2814 {
2818 }
2819 else
2820 {
2821 /* The powerpc .got has a blrl instruction in it. Mark it
2822 executable. */
2827 }
2837 }
2839 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2840 to output sections (just like _bfd_elf_create_dynamic_sections has
2841 to create .dynbss and .rela.bss). */
2843 static bfd_boolean
2845 {
2848 flagword flags;
2876 {
2883 }
2896 /* The VxWorks PLT is a loaded section with contents. */
2899 }
2901 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2903 static void
2907 {
2914 {
2916 {
2920 /* Add reloc counts against the indirect sym to the direct sym
2921 list. Merge any entries against the same section. */
2923 {
2928 {
2933 }
2936 }
2938 }
2942 }
2947 /* If called to transfer flags for a weakdef during processing
2948 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
2949 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
2961 /* If we were called to copy over info for a weak sym, that's all. */
2965 /* Copy over the GOT refcount entries that we may have already seen to
2966 the symbol which just became indirect. */
2970 /* And plt entries. */
2972 {
2974 {
2979 {
2984 {
2988 }
2991 }
2993 }
2997 }
3000 {
3008 }
3009 }
3011 /* Hook called by the linker routine which adds symbols from an object
3012 file. We use it to put .comm items in .sbss, and not .bss. */
3014 static bfd_boolean
3022 {
3027 {
3028 /* Common symbols less than or equal to -G nn bytes are automatically
3029 put into .sbss. */
3034 {
3042 flags);
3045 }
3049 }
3052 }
3053 \f
3054 static bfd_boolean
3057 {
3066 }
3068 /* Create a special linker section. */
3070 static bfd_boolean
3073 flagword flags,
3075 {
3082 /* Record the first bfd that needs the special sections. */
3088 flags);
3095 }
3097 /* Find a linker generated pointer with a given addend and type. */
3100 elf_find_pointer_linker_section
3102 bfd_vma addend,
3104 {
3110 }
3112 /* Allocate a pointer to live in a linker created section. */
3114 static bfd_boolean
3119 {
3123 bfd_size_type amt;
3127 /* Is this a global symbol? */
3129 {
3132 /* Has this symbol already been allocated? If so, our work is done. */
3136 lsect))
3140 }
3141 else
3142 {
3145 /* Allocation of a pointer to a local symbol. */
3148 /* Allocate a table to hold the local symbols if first time. */
3150 {
3161 }
3163 /* Has this symbol already been allocated? If so, our work is done. */
3166 lsect))
3170 }
3172 /* Allocate space for a pointer in the linker section, and allocate
3173 a new pointer record from internal memory. */
3189 #ifdef DEBUG
3194 #endif
3197 }
3199 static bfd_boolean
3204 {
3209 {
3217 }
3223 }
3225 static bfd_boolean
3228 {
3237 {
3247 }
3250 }
3254 {
3263 }
3265 static void
3267 {
3270 abfd,
3273 }
3275 /* Look through the relocs for a section during the first phase, and
3276 allocate space in the global offset table or procedure linkage
3277 table. */
3279 static bfd_boolean
3284 {
3295 /* Don't do anything special with non-loaded, non-alloced sections.
3296 In particular, any relocs in such sections should not affect GOT
3297 and PLT reference counting (ie. we don't allow them to create GOT
3298 or PLT entries), there's no possibility or desire to optimize TLS
3299 relocs, and there's not much point in propagating relocs to shared
3300 libs that the dynamic linker won't relocate. */
3304 #ifdef DEBUG
3307 #endif
3311 /* Initialize howto table if not already done. */
3323 {
3332 else
3333 {
3338 }
3340 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
3341 This shows up in particular in an R_PPC_ADDR32 in the eabi
3342 startup code. */
3346 {
3352 }
3356 {
3385 dogottls:
3387 /* Fall thru */
3389 /* GOT16 relocations */
3394 /* This symbol requires a global offset table entry. */
3396 {
3401 }
3403 {
3406 }
3407 else
3408 /* This is a global offset table entry for a local symbol. */
3413 /* Indirect .sdata relocation. */
3416 {
3419 }
3428 {
3431 }
3434 /* Indirect .sdata2 relocation. */
3437 {
3440 }
3449 {
3452 }
3457 {
3460 }
3465 {
3468 }
3473 {
3476 }
3481 {
3484 }
3490 {
3493 }
3501 {
3504 }
3513 {
3516 }
3527 #ifdef DEBUG
3529 #endif
3530 /* This symbol requires a procedure linkage table entry. We
3531 actually build the entry in finish_dynamic_symbol,
3532 because this might be a case of linking PIC code without
3533 linking in any dynamic objects, in which case we don't
3534 need to generate a procedure linkage table after all. */
3537 {
3538 /* It does not make sense to have a procedure linkage
3539 table entry for a local symbol. */
3542 abfd,
3543 sec,
3548 }
3549 else
3550 {
3554 {
3557 }
3561 }
3564 /* The following relocations don't need to propagate the
3565 relocation if linking a shared object since they are
3566 section relative. */
3585 /* These are just markers. */
3592 /* These should only appear in dynamic objects. */
3599 /* These aren't handled yet. We'll report an error later. */
3608 /* This refers only to functions defined in the shared library. */
3611 {
3614 }
3617 /* This relocation describes the C++ object vtable hierarchy.
3618 Reconstruct it for later use during GC. */
3624 /* This relocation describes which C++ vtable entries are actually
3625 used. Record for later use during GC. */
3633 /* We shouldn't really be seeing these. */
3643 /* Nor these. */
3654 {
3655 /* Old -fPIC gcc code has .long LCTOC1-LCFx just before
3656 the start of a function, which assembles to a REL32
3657 reference to .got2. If we detect one of these, then
3658 force the old PLT layout because the linker cannot
3659 reliably deduce the GOT pointer value needed for
3660 PLT call stubs. */
3664 r_symndx);
3666 {
3669 }
3670 }
3673 /* fall through */
3683 {
3684 /* We may need a plt entry if the symbol turns out to be
3685 a function defined in a dynamic object. */
3689 /* We may need a copy reloc too. */
3692 }
3702 {
3704 {
3707 }
3709 }
3710 /* fall through */
3717 {
3718 /* We may need a plt entry if the symbol turns out to be
3719 a function defined in a dynamic object. */
3723 }
3725 dodyn:
3726 /* If we are creating a shared library, and this is a reloc
3727 against a global symbol, or a non PC relative reloc
3728 against a local symbol, then we need to copy the reloc
3729 into the shared library. However, if we are linking with
3730 -Bsymbolic, we do not need to copy a reloc against a
3731 global symbol which is defined in an object we are
3732 including in the link (i.e., DEF_REGULAR is set). At
3733 this point we have not seen all the input files, so it is
3734 possible that DEF_REGULAR is not set now but will be set
3735 later (it is never cleared). In case of a weak definition,
3736 DEF_REGULAR may be cleared later by a strong definition in
3737 a shared library. We account for that possibility below by
3738 storing information in the dyn_relocs field of the hash
3739 table entry. A similar situation occurs when creating
3740 shared libraries and symbol visibility changes render the
3741 symbol local.
3743 If on the other hand, we are creating an executable, we
3744 may need to keep relocations for symbols satisfied by a
3745 dynamic library if we manage to avoid copy relocs for the
3746 symbol. */
3753 || (ELIMINATE_COPY_RELOCS
3758 {
3762 #ifdef DEBUG
3764 "ppc_elf_check_relocs needs to "
3768 #endif
3770 {
3774 sreloc = _bfd_elf_make_dynamic_reloc_section
3779 }
3781 /* If this is a global symbol, we count the number of
3782 relocations we need for this symbol. */
3784 {
3786 }
3787 else
3788 {
3789 /* Track dynamic relocs needed for local syms too.
3790 We really need local syms available to do this
3791 easily. Oh well. */
3803 }
3807 {
3816 }
3821 }
3824 }
3825 }
3828 }
3829 \f
3831 /* Merge object attributes from IBFD into OBFD. Raise an error if
3832 there are conflicting attributes. */
3833 static bfd_boolean
3835 {
3840 {
3841 /* This is the first object. Copy the attributes. */
3844 /* Use the Tag_null value to indicate the attributes have been
3845 initialized. */
3849 }
3854 /* Check for conflicting Tag_GNU_Power_ABI_FP attributes and merge
3855 non-conflicting ones. */
3859 {
3864 ;
3866 _bfd_error_handler
3869 _bfd_error_handler
3873 _bfd_error_handler
3877 _bfd_error_handler
3881 _bfd_error_handler
3884 _bfd_error_handler
3887 else
3888 _bfd_error_handler
3891 }
3893 /* Check for conflicting Tag_GNU_Power_ABI_Vector attributes and
3894 merge non-conflicting ones. */
3898 {
3902 {
3906 }
3909 {
3913 }
3919 ;
3920 /* For now, allow generic to transition to AltiVec or SPE
3921 without a warning. If GCC marked files with their stack
3922 alignment and used don't-care markings for files which are
3923 not affected by the vector ABI, we could warn about this
3924 case too. */
3928 ;
3930 _bfd_error_handler
3934 _bfd_error_handler
3937 else
3938 _bfd_error_handler
3941 }
3943 /* Check for conflicting Tag_GNU_Power_ABI_Struct_Return attributes
3944 and merge non-conflicting ones. */
3948 {
3953 ;
3955 _bfd_error_handler
3958 _bfd_error_handler
3961 _bfd_error_handler
3964 else
3965 _bfd_error_handler
3968 }
3970 /* Merge Tag_compatibility attributes and any common GNU ones. */
3974 }
3976 /* Merge backend specific data from an object file to the output
3977 object file when linking. */
3979 static bfd_boolean
3981 {
3982 flagword old_flags;
3983 flagword new_flags;
3984 bfd_boolean error;
3989 /* Check if we have the same endianess. */
3999 {
4000 /* First call, no flags set. */
4003 }
4005 /* Compatible flags are ok. */
4007 ;
4009 /* Incompatible flags. */
4010 else
4011 {
4012 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
4013 to be linked with either. */
4017 {
4022 }
4025 {
4030 }
4032 /* The output is -mrelocatable-lib iff both the input files are. */
4036 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
4037 but each input file is either -mrelocatable or -mrelocatable-lib. */
4043 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
4044 any module uses it. */
4050 /* Warn about any other mismatches. */
4052 {
4058 }
4061 {
4064 }
4065 }
4068 }
4069 \f
4070 /* Choose which PLT scheme to use, and set .plt flags appropriately.
4071 Returns -1 on error, 0 for old PLT, 1 for new PLT. */
4072 int
4077 {
4079 flagword flags;
4084 {
4087 else
4088 {
4092 /* Look through the reloc flags left by ppc_elf_check_relocs.
4093 Use the old style bss plt if a file makes plt calls
4094 without using the new relocs, and if ld isn't given
4095 --secure-plt and we never see REL16 relocs. */
4100 {
4104 {
4108 }
4109 }
4111 }
4112 }
4121 {
4125 /* The new PLT is a loaded section. */
4130 /* The new GOT is not executable. */
4134 }
4135 else
4136 {
4137 /* Stop an unused .glink section from affecting .text alignment. */
4141 }
4143 }
4144 \f
4145 /* Return the section that should be marked against GC for a given
4146 relocation. */
4154 {
4157 {
4161 }
4164 }
4166 /* Update the got, plt and dynamic reloc reference counts for the
4167 section being removed. */
4169 static bfd_boolean
4174 {
4198 {
4205 {
4217 {
4218 /* Everything must go for SEC. */
4221 }
4222 }
4226 {
4248 {
4251 }
4253 {
4256 }
4266 /* Fall thru */
4289 {
4294 }
4299 }
4300 }
4302 }
4303 \f
4304 /* Set htab->tls_get_addr and call the generic ELF tls_setup function. */
4306 asection *
4308 {
4315 {
4318 }
4323 }
4325 /* Run through all the TLS relocs looking for optimization
4326 opportunities. */
4328 bfd_boolean
4331 {
4341 /* Make two passes through the relocs. First time check that tls
4342 relocs involved in setting up a tls_get_addr call are indeed
4343 followed by such a call. If they are not, exclude them from
4344 the optimizations done on the second pass. */
4347 {
4353 {
4356 /* Read the relocations. */
4364 {
4370 bfd_boolean is_local;
4376 {
4384 }
4394 {
4398 /* Fall thru */
4402 /* These relocs should never be against a symbol
4403 defined in a shared lib. Leave them alone if
4404 that turns out to be the case. */
4408 /* LD -> LE */
4416 /* Fall thru */
4421 /* GD -> LE */
4423 else
4424 /* GD -> IE */
4434 {
4435 /* IE -> LE */
4439 }
4440 else
4445 }
4448 {
4453 {
4458 /* The next instruction should be a call to
4459 __tls_get_addr. Peek at the reloc to be sure. */
4468 {
4479 }
4480 }
4482 /* Uh oh, we didn't find the expected call. We
4483 could just mark this symbol to exclude it
4484 from tls optimization but it's safer to skip
4485 the entire section. */
4488 }
4491 {
4494 }
4495 else
4496 {
4502 {
4509 {
4513 }
4514 }
4522 }
4525 {
4526 /* We managed to get rid of a got entry. */
4529 }
4532 {
4538 }
4542 }
4546 }
4550 {
4553 else
4555 }
4556 }
4558 }
4559 \f
4560 /* Return true if we have dynamic relocs that apply to read-only sections. */
4562 static bfd_boolean
4564 {
4568 {
4575 }
4577 }
4579 /* Adjust a symbol defined by a dynamic object and referenced by a
4580 regular object. The current definition is in some section of the
4581 dynamic object, but we're not including those sections. We have to
4582 change the definition to something the rest of the link can
4583 understand. */
4585 static bfd_boolean
4588 {
4592 #ifdef DEBUG
4595 #endif
4597 /* Make sure we know what is going on here. */
4606 /* Deal with function syms. */
4609 {
4610 /* Clear procedure linkage table information for any symbol that
4611 won't need a .plt entry. */
4620 {
4621 /* A PLT entry is not required/allowed when:
4623 1. We are not using ld.so; because then the PLT entry
4624 can't be set up, so we can't use one. In this case,
4625 ppc_elf_adjust_dynamic_symbol won't even be called.
4627 2. GC has rendered the entry unused.
4629 3. We know for certain that a call to this symbol
4630 will go to this object, or will remain undefined. */
4633 }
4634 else
4635 {
4636 /* After adjust_dynamic_symbol, non_got_ref set means that
4637 dyn_relocs for this symbol should be discarded.
4638 If we get here we know we are making a PLT entry for this
4639 symbol, and in an executable we'd normally resolve
4640 relocations against this symbol to the PLT entry. Allow
4641 dynamic relocs if the reference is weak, and the dynamic
4642 relocs will not cause text relocation. */
4649 }
4651 }
4652 else
4655 /* If this is a weak symbol, and there is a real definition, the
4656 processor independent code will have arranged for us to see the
4657 real definition first, and we can just use the same value. */
4659 {
4667 }
4669 /* This is a reference to a symbol defined by a dynamic object which
4670 is not a function. */
4672 /* If we are creating a shared library, we must presume that the
4673 only references to the symbol are via the global offset table.
4674 For such cases we need not do anything here; the relocations will
4675 be handled correctly by relocate_section. */
4679 /* If there are no references to this symbol that do not use the
4680 GOT, we don't need to generate a copy reloc. */
4684 /* If we didn't find any dynamic relocs in read-only sections, then
4685 we'll be keeping the dynamic relocs and avoiding the copy reloc.
4686 We can't do this if there are any small data relocations. This
4687 doesn't work on VxWorks, where we can not have dynamic
4688 relocations (other than copy and jump slot relocations) in an
4689 executable. */
4695 {
4698 }
4701 {
4705 }
4707 /* We must allocate the symbol in our .dynbss section, which will
4708 become part of the .bss section of the executable. There will be
4709 an entry for this symbol in the .dynsym section. The dynamic
4710 object will contain position independent code, so all references
4711 from the dynamic object to this symbol will go through the global
4712 offset table. The dynamic linker will use the .dynsym entry to
4713 determine the address it must put in the global offset table, so
4714 both the dynamic object and the regular object will refer to the
4715 same memory location for the variable.
4717 Of course, if the symbol is referenced using SDAREL relocs, we
4718 must instead allocate it in .sbss. */
4722 else
4726 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
4727 copy the initial value out of the dynamic object and into the
4728 runtime process image. We need to remember the offset into the
4729 .rela.bss section we are going to use. */
4731 {
4736 else
4741 }
4744 }
4745 \f
4746 /* Generate a symbol to mark plt call stubs. For non-PIC code the sym is
4747 xxxxxxxx.plt_call32.<callee> where xxxxxxxx is a hex number, usually 0,
4748 specifying the addend on the plt relocation. For -fpic code, the sym
4749 is xxxxxxxx.plt_pic32.<callee>, and for -fPIC
4750 xxxxxxxx.got2.plt_pic32.<callee>. */
4752 static bfd_boolean
4756 {
4765 else
4785 {
4794 }
4796 }
4798 /* Allocate NEED contiguous space in .got, and return the offset.
4799 Handles allocation of the got header when crossing 32k. */
4801 static bfd_vma
4803 {
4804 bfd_vma where;
4808 {
4811 }
4812 else
4813 {
4816 {
4819 }
4820 else
4821 {
4824 {
4827 }
4830 }
4831 }
4833 }
4835 /* Allocate space in associated reloc sections for dynamic relocs. */
4837 static bfd_boolean
4839 {
4849 /* When warning symbols are created, they **replace** the "real"
4850 entry in the hash table, thus we never get to see the real
4851 symbol in a hash traversal. So look at it now. */
4856 {
4863 {
4864 /* Make sure this symbol is output as a dynamic symbol. */
4867 {
4870 }
4874 {
4878 {
4880 {
4883 }
4888 {
4891 }
4896 {
4899 }
4905 }
4906 else
4907 {
4909 {
4910 /* If this is the first .plt entry, make room
4911 for the special first entry. */
4915 /* The PowerPC PLT is actually composed of two
4916 parts, the first part is 2 words (for a load
4917 and a jump), and then there is a remaining
4918 word available at the end. */
4925 /* If this symbol is not defined in a regular
4926 file, and we are not generating a shared
4927 library, then set the symbol to this location
4928 in the .plt. This is required to make
4929 function pointers compare as equal between
4930 the normal executable and the shared library. */
4934 {
4937 }
4939 /* Make room for this entry. */
4941 /* After the 8192nd entry, room for two entries
4942 is allocated. */
4948 }
4950 }
4952 /* We also need to make an entry in the .rela.plt section. */
4954 {
4958 {
4959 /* Allocate space for the unloaded relocations. */
4961 {
4964 {
4968 }
4973 }
4975 /* Every PLT entry has an associated GOT entry in
4976 .got.plt. */
4978 }
4980 }
4981 }
4982 else
4984 }
4985 else
4989 {
4992 }
4993 }
4994 else
4995 {
4998 }
5002 {
5003 bfd_boolean dyn;
5006 /* Make sure this symbol is output as a dynamic symbol. */
5010 {
5013 }
5017 {
5019 {
5021 /* We'll just use htab->tlsld_got.offset. This should
5022 always be the case. It's a little odd if we have
5023 a local dynamic reloc against a non-local symbol. */
5025 else
5027 }
5034 }
5035 else
5039 else
5040 {
5047 {
5048 /* All the entries we allocated need relocs.
5049 Except LD only needs one. */
5054 }
5055 }
5056 }
5057 else
5064 /* In the shared -Bsymbolic case, discard space allocated for
5065 dynamic pc-relative relocs against symbols which turn out to be
5066 defined in regular objects. For the normal shared case, discard
5067 space for relocs that have become local due to symbol visibility
5068 changes. */
5071 {
5072 /* Relocs that use pc_count are those that appear on a call insn,
5073 or certain REL relocs (see must_be_dyn_reloc) that can be
5074 generated via assembly. We want calls to protected symbols to
5075 resolve directly to the function rather than going via the plt.
5076 If people want function pointer comparisons to work as expected
5077 then they should avoid writing weird assembly. */
5079 {
5083 {
5088 else
5090 }
5091 }
5094 {
5098 {
5101 else
5103 }
5104 }
5106 /* Discard relocs on undefined symbols that must be local. */
5113 /* Also discard relocs on undefined weak syms with non-default
5114 visibility. */
5117 {
5121 /* Make sure undefined weak symbols are output as a dynamic
5122 symbol in PIEs. */
5125 {
5128 }
5129 }
5130 }
5132 {
5133 /* For the non-shared case, discard space for relocs against
5134 symbols which turn out to need copy relocs or are not
5135 dynamic. */
5139 {
5140 /* Make sure this symbol is output as a dynamic symbol.
5141 Undefined weak syms won't yet be marked as dynamic. */
5144 {
5147 }
5149 /* If that succeeded, we know we'll be keeping all the
5150 relocs. */
5153 }
5157 keep: ;
5158 }
5160 /* Finally, allocate space. */
5162 {
5165 }
5168 }
5170 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
5171 read-only sections. */
5173 static bfd_boolean
5175 {
5183 {
5186 /* Not an error, just cut short the traversal. */
5188 }
5190 }
5192 /* Set the sizes of the dynamic sections. */
5194 static bfd_boolean
5197 {
5200 bfd_boolean relocs;
5203 #ifdef DEBUG
5205 #endif
5211 {
5212 /* Set the contents of the .interp section to the interpreter. */
5214 {
5219 }
5220 }
5227 /* Set up .got offsets for local syms, and space for local dynamic
5228 relocs. */
5230 {
5234 bfd_size_type locsymcount;
5241 {
5248 {
5251 {
5252 /* Input section has been discarded, either because
5253 it is a copy of a linkonce section or due to
5254 linker script /DISCARD/, so we'll be discarding
5255 the relocs too. */
5256 }
5260 {
5261 /* Relocations in vxworks .tls_vars sections are
5262 handled specially by the loader. */
5263 }
5265 {
5272 }
5273 }
5274 }
5286 {
5289 {
5298 }
5299 else
5303 else
5304 {
5309 }
5310 }
5311 else
5313 }
5315 /* Allocate space for global sym dynamic relocs. */
5319 {
5323 }
5324 else
5328 {
5331 /* If we haven't allocated the header, do so now. When we get here,
5332 for old plt/got the got size will be 0 to 32764 (not allocated),
5333 or 32780 to 65536 (header allocated). For new plt/got, the
5334 corresponding ranges are 0 to 32768 and 32780 to 65536. */
5336 {
5341 }
5344 }
5347 {
5349 /* Space for the branch table. */
5351 /* Pad out to align the start of PLTresolve. */
5356 {
5363 {
5372 }
5378 {
5387 }
5388 }
5389 }
5391 /* We've now determined the sizes of the various dynamic sections.
5392 Allocate memory for them. */
5395 {
5408 {
5409 /* We'd like to strip these sections if they aren't needed, but if
5410 we've exported dynamic symbols from them we must leave them.
5411 It's too late to tell BFD to get rid of the symbols. */
5414 /* Strip this section if we don't need it; see the
5415 comment below. */
5416 }
5419 {
5420 /* Strip these too. */
5421 }
5423 {
5425 {
5426 /* Remember whether there are any relocation sections. */
5429 /* We use the reloc_count field as a counter if we need
5430 to copy relocs into the output file. */
5432 }
5433 }
5434 else
5435 {
5436 /* It's not one of our sections, so don't allocate space. */
5438 }
5441 {
5442 /* If we don't need this section, strip it from the
5443 output file. This is mostly to handle .rela.bss and
5444 .rela.plt. We must create both sections in
5445 create_dynamic_sections, because they must be created
5446 before the linker maps input sections to output
5447 sections. The linker does that before
5448 adjust_dynamic_symbol is called, and it is that
5449 function which decides whether anything needs to go
5450 into these sections. */
5453 }
5458 /* Allocate memory for the section contents. */
5462 }
5465 {
5466 /* Add some entries to the .dynamic section. We fill in the
5467 values later, in ppc_elf_finish_dynamic_sections, but we
5468 must add the entries now so that we get the correct size for
5469 the .dynamic section. The DT_DEBUG entry is filled in by the
5470 dynamic linker and used by the debugger. */
5471 #define add_dynamic_entry(TAG, VAL) \
5472 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
5475 {
5478 }
5481 {
5487 }
5490 {
5493 }
5496 {
5501 }
5503 /* If any dynamic relocs apply to a read-only section, then we
5504 need a DT_TEXTREL entry. */
5507 info);
5510 {
5513 }
5517 }
5518 #undef add_dynamic_entry
5521 }
5523 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5525 static bfd_boolean
5527 {
5535 }
5536 \f
5537 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
5540 {
5549 };
5552 {
5557 };
5559 static bfd_boolean
5564 {
5565 struct one_fixup
5566 {
5569 bfd_vma toff;
5570 bfd_vma trampoff;
5571 };
5581 bfd_size_type trampoff;
5586 /* Nothing to do if there are no relocations, and no need to do
5587 anything with non-alloc sections. */
5594 /* Space for a branch around any trampolines. */
5599 /* Get a copy of the native relocations. */
5610 {
5622 {
5637 }
5639 /* Get the value of the symbol referred to by the reloc. */
5641 {
5642 /* A local symbol. */
5645 /* Read this BFD's local symbols. */
5647 {
5655 }
5663 else
5668 }
5669 else
5670 {
5671 /* Global symbol handling. */
5686 {
5690 {
5692 {
5695 }
5696 else
5697 {
5700 }
5701 }
5702 }
5704 ;
5707 {
5710 }
5711 else
5715 }
5717 /* If the branch and target are in the same section, you have
5718 no hope of adding stubs. We'll error out later should the
5719 branch overflow. */
5723 /* There probably isn't any reason to handle symbols in
5724 SEC_MERGE sections; SEC_MERGE doesn't seem a likely
5725 attribute for a code section, and we are only looking at
5726 branches. However, implement it correctly here as a
5727 reference for other target relax_section functions. */
5729 {
5730 /* At this stage in linking, no SEC_MERGE symbol has been
5731 adjusted, so all references to such symbols need to be
5732 passed through _bfd_merged_section_offset. (Later, in
5733 relocate_section, all SEC_MERGE symbols *except* for
5734 section symbols have been adjusted.)
5736 gas may reduce relocations against symbols in SEC_MERGE
5737 sections to a relocation against the section symbol when
5738 the original addend was zero. When the reloc is against
5739 a section symbol we should include the addend in the
5740 offset passed to _bfd_merged_section_offset, since the
5741 location of interest is the original symbol. On the
5742 other hand, an access to "sym+addend" where "sym" is not
5743 a section symbol should not include the addend; Such an
5744 access is presumed to be an offset from "sym"; The
5745 location of interest is just "sym". */
5751 toff);
5755 }
5756 /* PLTREL24 addends are special. */
5760 /* Attempted -shared link of non-pic code loses. */
5769 /* If the branch is in range, no need to do anything. */
5773 /* Look for an existing fixup to this address. */
5779 {
5785 /* Oh dear, we can't reach a trampoline. Don't try to add
5786 one. We'll report an error later. */
5790 {
5794 }
5795 else
5796 {
5800 }
5809 /* Hijack the old relocation. Since we need two
5810 relocations for this use a "composite" reloc. */
5812 stub_rtype);
5817 /* Record the fixup so we don't do it again this section. */
5826 changes++;
5827 }
5828 else
5829 {
5834 /* Nop out the reloc, since we're finalizing things here. */
5836 }
5838 /* Get the section contents. */
5840 {
5841 /* Get cached copy if it exists. */
5844 else
5845 {
5846 /* Go get them off disk. */
5849 }
5850 }
5852 /* Fix up the existing branch to hit the trampoline. */
5855 {
5873 }
5874 }
5876 /* Write out the trampolines. */
5878 {
5881 bfd_vma val;
5884 do
5885 {
5889 }
5897 /* Branch around the trampolines. */
5905 {
5908 }
5909 else
5910 {
5913 }
5917 {
5919 i++;
5923 }
5925 }
5929 {
5932 else
5933 {
5934 /* Cache the symbols for elf_link_input_bfd. */
5936 }
5937 }
5941 {
5944 else
5945 {
5946 /* Cache the section contents for elf_link_input_bfd. */
5948 }
5949 }
5952 {
5953 /* Append sufficient NOP relocs so we can write out relocation
5954 information for the trampolines. */
5964 {
5968 }
5975 }
5982 error_return:
5992 }
5993 \f
5994 /* What to do when ld finds relocations against symbols defined in
5995 discarded sections. */
5997 static unsigned int
5999 {
6007 }
6008 \f
6009 /* Fill in the address for a pointer generated in a linker section. */
6011 static bfd_vma
6015 bfd_vma relocation,
6017 {
6023 {
6024 /* Handle global symbol. */
6030 }
6031 else
6032 {
6033 /* Handle local symbol. */
6039 }
6043 lsect);
6046 /* Offset will always be a multiple of four, so use the bottom bit
6047 as a "written" flag. */
6049 {
6054 }
6060 #ifdef DEBUG
6064 #endif
6066 /* Subtract out the addend, because it will get added back in by the normal
6067 processing. */
6069 }
6071 /* The RELOCATE_SECTION function is called by the ELF backend linker
6072 to handle the relocations for a section.
6074 The relocs are always passed as Rela structures; if the section
6075 actually uses Rel structures, the r_addend field will always be
6076 zero.
6078 This function is responsible for adjust the section contents as
6079 necessary, and (if using Rela relocs and generating a
6080 relocatable output file) adjusting the reloc addend as
6081 necessary.
6083 This function does not have to worry about setting the reloc
6084 address or the reloc symbol index.
6086 LOCAL_SYMS is a pointer to the swapped in local symbols.
6088 LOCAL_SECTIONS is an array giving the section in the input file
6089 corresponding to the st_shndx field of each local symbol.
6091 The global hash table entry for the global symbols can be found
6092 via elf_sym_hashes (input_bfd).
6094 When generating relocatable output, this function must handle
6095 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
6096 going to be the section symbol corresponding to the output
6097 section, which means that the addend must be adjusted
6098 accordingly. */
6100 static bfd_boolean
6109 {
6115 Elf_Internal_Rela outrel;
6121 bfd_boolean is_vxworks_tls;
6123 #ifdef DEBUG
6129 #endif
6133 /* Initialize howto table if not already done. */
6141 /* We have to handle relocations in vxworks .tls_vars sections
6142 specially, because the dynamic loader is 'weird'. */
6149 {
6151 bfd_vma addend;
6152 bfd_reloc_status_type r;
6159 bfd_vma relocation;
6161 bfd_boolean unresolved_reloc;
6162 bfd_boolean warned;
6174 {
6180 }
6181 else
6182 {
6189 }
6192 {
6193 /* For relocs against symbols from removed linkonce sections,
6194 or sections discarded by a linker script, we just want the
6195 section contents zeroed. Avoid any special processing. */
6203 }
6206 {
6210 {
6211 /* R_PPC_PLTREL24 is rather special. If non-zero, the
6212 addend specifies the GOT pointer offset within .got2. */
6214 }
6216 }
6218 /* TLS optimizations. Replace instruction sequences and relocs
6219 based on information we collected in tls_optimize. We edit
6220 RELOCS so that --emit-relocs will output something sensible
6221 for the final instruction stream. */
6225 {
6229 {
6233 }
6234 }
6236 /* Ensure reloc mapping code below stays sane. */
6247 {
6255 {
6256 bfd_vma insn;
6263 }
6269 {
6278 else
6281 /* add -> addi. */
6287 /* load and store indexed -> dform. */
6291 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
6296 /* lwax -> lwa. */
6298 else
6305 /* Was PPC_TLS which sits on insn boundary, now
6306 PPC_TPREL16_LO which is at low-order half-word. */
6308 }
6321 {
6322 tls_gdld_hi:
6326 else
6327 {
6331 }
6333 }
6346 {
6348 bfd_vma offset;
6350 tls_ldgd_opt:
6355 {
6356 /* IE */
6366 }
6367 else
6368 {
6369 /* LE */
6373 {
6374 /* Was an LD reloc. */
6377 r_symndx++)
6387 }
6391 R_PPC_TPREL16_LO);
6394 }
6399 {
6400 /* We changed the symbol on an LD reloc. Start over
6401 in order to get h, sym, sec etc. right. */
6402 rel--;
6404 }
6405 }
6407 }
6409 /* Handle other relocations that tweak non-addend part of insn. */
6412 {
6416 /* Branch taken prediction relocations. */
6420 /* Fall thru */
6422 /* Branch not taken prediction relocations. */
6433 /* Invert 'y' bit if not the default. */
6439 }
6447 {
6464 /* GOT16 relocations. Like an ADDR16 using the symbol's
6465 address in the GOT as relocation value instead of the
6466 symbol's value itself. Also, create a GOT entry for the
6467 symbol and put the symbol value there. */
6500 dogot:
6501 {
6502 /* Relocation is to the entry for this symbol in the global
6503 offset table. */
6504 bfd_vma off;
6517 {
6518 bfd_boolean dyn;
6523 /* This is actually a static link, or it is a
6524 -Bsymbolic link and the symbol is defined
6525 locally, or the symbol was forced to be local
6526 because of a version file. */
6527 ;
6528 else
6529 {
6532 }
6534 }
6535 else
6536 {
6540 }
6542 /* The offset must always be a multiple of 4. We use the
6543 least significant bit to record whether we have already
6544 processed this entry. */
6548 else
6549 {
6560 /* We might have multiple got entries for this sym.
6561 Initialize them all. */
6562 do
6563 {
6567 {
6570 }
6572 {
6575 }
6577 {
6580 }
6582 {
6585 }
6587 /* Generate relocs for the dynamic linker. */
6593 {
6599 {
6602 {
6609 outrel.r_info
6611 }
6612 }
6619 else
6622 {
6626 }
6631 }
6633 /* Init the .got section contents if we're not
6634 emitting a reloc. */
6635 else
6636 {
6642 {
6648 {
6652 }
6653 }
6656 }
6661 }
6666 }
6672 {
6674 {
6680 {
6684 {
6687 }
6688 }
6689 }
6690 }
6694 + off
6697 /* Addends on got relocations don't make much sense.
6698 x+off@got is actually x@got+off, and since the got is
6699 generated by a hash table traversal, the value in the
6700 got at entry m+n bears little relation to the entry m. */
6704 input_bfd,
6705 input_section,
6708 sym_name);
6709 }
6712 /* Relocations that need no special processing. */
6714 /* It makes no sense to point a local relocation
6715 at a symbol not in this object. */
6717 {
6720 input_bfd,
6721 input_section,
6723 TRUE))
6726 }
6736 /* Relocations that may need to be propagated if this is a shared
6737 object. */
6743 /* The TPREL16 relocs shouldn't really be used in shared
6744 libs as they will result in DT_TEXTREL being set, but
6745 support them anyway. */
6770 /* fall through */
6785 /* If these relocations are not to a named symbol, they can be
6786 handled right here, no need to bother the dynamic linker. */
6790 /* fall through */
6798 /* fall through */
6800 dodyn:
6814 || (ELIMINATE_COPY_RELOCS
6820 {
6823 #ifdef DEBUG
6828 #endif
6830 /* When generating a shared object, these relocations
6831 are copied into the output file to be resolved at run
6832 time. */
6834 {
6835 sreloc = _bfd_elf_get_dynamic_reloc_section
6839 }
6857 {
6861 }
6862 else
6863 {
6868 else
6869 {
6873 ;
6875 {
6878 }
6879 else
6880 {
6883 /* We are turning this relocation into one
6884 against a section symbol. It would be
6885 proper to subtract the symbol's value,
6886 osec->vma, from the emitted reloc addend,
6887 but ld.so expects buggy relocs. */
6891 {
6894 }
6896 #ifdef DEBUG
6901 #endif
6902 }
6905 }
6906 }
6915 /* This reloc will be computed at runtime. We clear the memory
6916 so that it contains predictable value. */
6920 {
6924 }
6925 }
6930 {
6937 else
6941 }
6944 /* Fall thru */
6950 /* Fall thru */
6953 relax32:
6954 {
6961 /* We're clearing the bits for R_PPC_ADDR16_HA
6962 and R_PPC_ADDR16_LO here. */
6966 /* t0 is HA, t1 is LO */
6974 /* Rewrite the reloc and convert one of the trailing nop
6975 relocs to describe this relocation. */
6977 /* The relocs are at the bottom 2 bytes */
6983 rel++;
6984 }
6987 /* Indirect .sdata relocation. */
6990 relocation
6995 /* Indirect .sdata2 relocation. */
6998 relocation
7003 /* Handle the TOC16 reloc. We want to use the offset within the .got
7004 section, not the actual VMA. This is appropriate when generating
7005 an embedded ELF object, for which the .got section acts like the
7006 AIX .toc section. */
7009 {
7012 }
7020 /* Relocation is to the entry for this symbol in the
7021 procedure linkage table. */
7022 {
7028 {
7029 /* We didn't make a PLT entry for this symbol. This
7030 happens when statically linking PIC code, or when
7031 using -Bsymbolic. */
7033 }
7040 else
7044 }
7047 /* Relocate against _SDA_BASE_. */
7049 {
7053 {
7056 }
7063 {
7067 input_bfd,
7068 sym_name,
7070 name);
7071 }
7073 }
7076 /* Relocate against _SDA2_BASE_. */
7078 {
7082 {
7085 }
7090 {
7094 input_bfd,
7095 sym_name,
7097 name);
7102 }
7104 }
7107 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
7110 {
7115 {
7118 }
7125 {
7128 }
7131 {
7134 }
7137 {
7139 }
7140 else
7141 {
7145 input_bfd,
7146 sym_name,
7148 name);
7153 }
7160 }
7161 }
7164 /* Relocate against the beginning of the section. */
7170 {
7173 }
7177 /* Negative relocations. */
7203 input_bfd,
7205 sym_name);
7210 }
7212 /* Do any further special processing. */
7214 {
7225 /* It's just possible that this symbol is a weak symbol
7226 that's not actually defined anywhere. In that case,
7227 'sec' would be NULL, and we should leave the symbol
7228 alone (it will be set to zero elsewhere in the link). */
7231 /* Fall thru */
7239 /* Add 0x10000 if sign bit in 0:15 is set.
7240 Bits 0:15 are not used. */
7243 }
7245 #ifdef DEBUG
7250 sym_name,
7251 r_symndx,
7254 #endif
7259 {
7262 input_bfd,
7263 input_section,
7266 sym_name);
7268 }
7271 input_bfd,
7272 input_section,
7273 contents,
7275 relocation,
7276 addend);
7279 {
7281 {
7287 {
7288 /* Assume this is a call protected by other code that
7289 detect the symbol is undefined. If this is the case,
7290 we can safely ignore the overflow. If not, the
7291 program is hosed anyway, and a little warning isn't
7292 going to help. */
7295 }
7299 sym_name,
7302 input_bfd,
7303 input_section,
7306 }
7307 else
7308 {
7314 }
7315 }
7316 }
7318 #ifdef DEBUG
7320 #endif
7323 }
7324 \f
7325 #define PPC_LO(v) ((v) & 0xffff)
7326 #define PPC_HI(v) (((v) >> 16) & 0xffff)
7327 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
7329 /* Finish up dynamic symbol handling. We set the contents of various
7330 dynamic sections here. */
7332 static bfd_boolean
7337 {
7340 bfd_boolean doneone;
7342 #ifdef DEBUG
7345 #endif
7353 {
7355 {
7356 Elf_Internal_Rela rela;
7358 bfd_vma reloc_index;
7362 else
7363 {
7369 }
7371 /* This symbol has an entry in the procedure linkage table.
7372 Set it up. */
7374 {
7375 bfd_vma got_offset;
7378 /* The first three entries in .got.plt are reserved. */
7381 /* Use the right PLT. */
7385 /* Fill in the .plt on VxWorks. */
7387 {
7394 }
7395 else
7396 {
7405 }
7412 /* This instruction is an immediate load. The value loaded is
7413 the byte offset of the R_PPC_JMP_SLOT relocation from the
7414 start of the .rela.plt section. The value is stored in the
7415 low-order 16 bits of the load instruction. */
7416 /* NOTE: It appears that this is now an index rather than a
7417 prescaled offset. */
7421 /* This instruction is a PC-relative branch whose target is
7422 the start of the PLT section. The address of this branch
7423 instruction is 20 bytes beyond the start of this PLT entry.
7424 The address is encoded in bits 6-29, inclusive. The value
7425 stored is right-shifted by two bits, permitting a 26-bit
7426 offset. */
7436 /* Fill in the GOT entry corresponding to this PLT slot with
7437 the address immediately after the the "bctr" instruction
7438 in this PLT entry. */
7445 {
7446 /* Fill in a couple of entries in .rela.plt.unloaded. */
7452 /* Provide the @ha relocation for the first instruction. */
7457 R_PPC_ADDR16_HA);
7462 /* Provide the @l relocation for the second instruction. */
7467 R_PPC_ADDR16_LO);
7472 /* Provide a relocation for the GOT entry corresponding to this
7473 PLT slot. Point it at the middle of the .plt entry. */
7478 R_PPC_ADDR32);
7481 }
7483 /* VxWorks uses non-standard semantics for R_PPC_JMP_SLOT.
7484 In particular, the offset for the relocation is not the
7485 address of the PLT entry for this function, as specified
7486 by the ABI. Instead, the offset is set to the address of
7487 the GOT slot for this function. See EABI 4.4.4.1. */
7492 }
7493 else
7494 {
7499 {
7500 /* We don't need to fill in the .plt. The ppc dynamic
7501 linker will fill it in. */
7502 }
7503 else
7504 {
7510 }
7511 }
7513 /* Fill in the entry in the .rela.plt section. */
7522 {
7523 /* Mark the symbol as undefined, rather than as
7524 defined in the .plt section. Leave the value if
7525 there were any relocations where pointer equality
7526 matters (this is a clue for the dynamic linker, to
7527 make function pointer comparisons work between an
7528 application and shared library), otherwise set it
7529 to zero. */
7534 {
7535 /* This breaks function pointer comparisons, but
7536 that is better than breaking tests for a NULL
7537 function pointer. */
7539 }
7540 }
7542 }
7545 {
7546 bfd_vma plt;
7555 {
7568 {
7577 }
7578 else
7579 {
7588 }
7589 }
7590 else
7591 {
7601 /* We only need one non-PIC glink stub. */
7603 }
7604 }
7605 else
7607 }
7610 {
7612 Elf_Internal_Rela rela;
7615 /* This symbols needs a copy reloc. Set it up. */
7617 #ifdef DEBUG
7619 #endif
7625 else
7634 }
7636 #ifdef DEBUG
7638 #endif
7640 /* Mark some specially defined symbols as absolute. */
7649 }
7650 \f
7651 static enum elf_reloc_type_class
7653 {
7655 {
7666 }
7667 }
7668 \f
7669 /* Finish up the dynamic sections. */
7671 static bfd_boolean
7674 {
7678 bfd_vma got;
7682 #ifdef DEBUG
7684 #endif
7691 else
7699 {
7707 {
7708 Elf_Internal_Dyn dyn;
7714 {
7718 else
7738 {
7742 }
7750 }
7753 }
7754 }
7757 {
7760 {
7765 {
7766 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4
7767 so that a function can easily find the address of
7768 _GLOBAL_OFFSET_TABLE_. */
7772 }
7775 {
7780 }
7781 }
7782 else
7783 {
7790 }
7793 }
7795 /* Fill in the first entry in the VxWorks procedure linkage table. */
7797 {
7798 /* Use the right PLT. */
7804 {
7811 }
7812 else
7813 {
7816 }
7825 {
7826 Elf_Internal_Rela rela;
7831 /* Output the @ha relocation for the first instruction. */
7840 /* Output the @l relocation for the second instruction. */
7849 /* Fix up the remaining relocations. They may have the wrong
7850 symbol index for _G_O_T_ or _P_L_T_ depending on the order
7851 in which symbols were output. */
7853 {
7854 Elf_Internal_Rela rel;
7870 }
7871 }
7872 }
7875 {
7878 bfd_vma res0;
7881 /*
7882 * PIC glink code is the following:
7883 *
7884 * # ith PLT code stub.
7885 * addis 11,30,(plt+(i-1)*4-got)@ha
7886 * lwz 11,(plt+(i-1)*4-got)@l(11)
7887 * mtctr 11
7888 * bctr
7889 *
7890 * # A table of branches, one for each plt entry.
7891 * # The idea is that the plt call stub loads ctr and r11 with these
7892 * # addresses, so (r11 - res_0) gives the plt index * 4.
7893 * res_0: b PLTresolve
7894 * res_1: b PLTresolve
7895 * .
7896 * # Some number of entries towards the end can be nops
7897 * res_n_m3: nop
7898 * res_n_m2: nop
7899 * res_n_m1:
7900 *
7901 * PLTresolve:
7902 * addis 11,11,(1f-res_0)@ha
7903 * mflr 0
7904 * bcl 20,31,1f
7905 * 1: addi 11,11,(1b-res_0)@l
7906 * mflr 12
7907 * mtlr 0
7908 * sub 11,11,12 # r11 = index * 4
7909 * addis 12,12,(got+4-1b)@ha
7910 * lwz 0,(got+4-1b)@l(12) # got[1] address of dl_runtime_resolve
7911 * lwz 12,(got+8-1b)@l(12) # got[2] contains the map address
7912 * mtctr 0
7913 * add 0,11,11
7914 * add 11,0,11 # r11 = index * 12 = reloc offset.
7915 * bctr
7916 */
7918 {
7919 ADDIS_11_11,
7920 MFLR_0,
7921 BCL_20_31,
7922 ADDI_11_11,
7923 MFLR_12,
7924 MTLR_0,
7925 SUB_11_11_12,
7926 ADDIS_12_12,
7927 LWZ_0_12,
7928 LWZ_12_12,
7929 MTCTR_0,
7930 ADD_0_11_11,
7931 ADD_11_0_11,
7932 BCTR,
7933 NOP,
7934 NOP
7935 };
7937 /*
7938 * Non-PIC glink code is a little simpler.
7939 *
7940 * # ith PLT code stub.
7941 * lis 11,(plt+(i-1)*4)@ha
7942 * lwz 11,(plt+(i-1)*4)@l(11)
7943 * mtctr 11
7944 * bctr
7945 *
7946 * The branch table is the same, then comes
7947 *
7948 * PLTresolve:
7949 * lis 12,(got+4)@ha
7950 * addis 11,11,(-res_0)@ha
7951 * lwz 0,(got+4)@l(12) # got[1] address of dl_runtime_resolve
7952 * addi 11,11,(-res_0)@l # r11 = index * 4
7953 * mtctr 0
7954 * add 0,11,11
7955 * lwz 12,(got+8)@l(12) # got[2] contains the map address
7956 * add 11,0,11 # r11 = index * 12 = reloc offset.
7957 * bctr
7958 */
7960 {
7961 LIS_12,
7962 ADDIS_11_11,
7963 LWZ_0_12,
7964 ADDI_11_11,
7965 MTCTR_0,
7966 ADD_0_11_11,
7967 LWZ_12_12,
7968 ADD_11_0_11,
7969 BCTR,
7970 NOP,
7971 NOP,
7972 NOP,
7973 NOP,
7974 NOP,
7975 NOP,
7976 NOP
7977 };
7984 /* Build the branch table, one for each plt entry (less one),
7985 and perhaps some padding. */
7991 {
7994 }
7996 {
7999 }
8005 /* Last comes the PLTresolve stub. */
8007 {
8008 bfd_vma bcl;
8011 {
8014 }
8028 {
8033 }
8034 else
8035 {
8040 }
8041 }
8042 else
8043 {
8045 {
8048 }
8058 {
8063 }
8064 else
8065 {
8070 }
8071 }
8072 }
8075 }
8076 \f
8077 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
8079 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
8081 #define ELF_ARCH bfd_arch_powerpc
8082 #define ELF_MACHINE_CODE EM_PPC
8083 #ifdef __QNXTARGET__
8084 #define ELF_MAXPAGESIZE 0x1000
8085 #else
8086 #define ELF_MAXPAGESIZE 0x10000
8087 #endif
8088 #define ELF_MINPAGESIZE 0x1000
8089 #define ELF_COMMONPAGESIZE 0x1000
8090 #define elf_info_to_howto ppc_elf_info_to_howto
8092 #ifdef EM_CYGNUS_POWERPC
8093 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
8094 #endif
8096 #ifdef EM_PPC_OLD
8097 #define ELF_MACHINE_ALT2 EM_PPC_OLD
8098 #endif
8100 #define elf_backend_plt_not_loaded 1
8101 #define elf_backend_can_gc_sections 1
8102 #define elf_backend_can_refcount 1
8103 #define elf_backend_rela_normal 1
8105 #define bfd_elf32_mkobject ppc_elf_mkobject
8106 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
8107 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
8108 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
8109 #define bfd_elf32_bfd_reloc_name_lookup ppc_elf_reloc_name_lookup
8110 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
8111 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create
8112 #define bfd_elf32_get_synthetic_symtab ppc_elf_get_synthetic_symtab
8114 #define elf_backend_object_p ppc_elf_object_p
8115 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
8116 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
8117 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
8118 #define elf_backend_relocate_section ppc_elf_relocate_section
8119 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
8120 #define elf_backend_check_relocs ppc_elf_check_relocs
8121 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol
8122 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
8123 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
8124 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
8125 #define elf_backend_hash_symbol ppc_elf_hash_symbol
8126 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
8127 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
8128 #define elf_backend_fake_sections ppc_elf_fake_sections
8129 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
8130 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
8131 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
8132 #define elf_backend_write_core_note ppc_elf_write_core_note
8133 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
8134 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing
8135 #define elf_backend_final_write_processing ppc_elf_final_write_processing
8136 #define elf_backend_write_section ppc_elf_write_section
8137 #define elf_backend_get_sec_type_attr ppc_elf_get_sec_type_attr
8138 #define elf_backend_plt_sym_val ppc_elf_plt_sym_val
8139 #define elf_backend_action_discarded ppc_elf_action_discarded
8140 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
8144 /* VxWorks Target */
8146 #undef TARGET_LITTLE_SYM
8147 #undef TARGET_LITTLE_NAME
8149 #undef TARGET_BIG_SYM
8150 #define TARGET_BIG_SYM bfd_elf32_powerpc_vxworks_vec
8151 #undef TARGET_BIG_NAME
8154 /* VxWorks uses the elf default section flags for .plt. */
8157 {
8165 }
8167 /* Like ppc_elf_link_hash_table_create, but overrides
8168 appropriately for VxWorks. */
8171 {
8176 {
8184 }
8186 }
8188 /* Tweak magic VxWorks symbols as they are loaded. */
8189 static bfd_boolean
8197 {
8199 valp))
8203 }
8205 static void
8207 {
8210 }
8212 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
8213 define it. */
8214 #undef elf_backend_want_plt_sym
8215 #define elf_backend_want_plt_sym 1
8216 #undef elf_backend_want_got_plt
8217 #define elf_backend_want_got_plt 1
8218 #undef elf_backend_got_symbol_offset
8219 #define elf_backend_got_symbol_offset 0
8220 #undef elf_backend_plt_not_loaded
8221 #define elf_backend_plt_not_loaded 0
8222 #undef elf_backend_plt_readonly
8223 #define elf_backend_plt_readonly 1
8224 #undef elf_backend_got_header_size
8225 #define elf_backend_got_header_size 12
8227 #undef bfd_elf32_get_synthetic_symtab
8229 #undef bfd_elf32_bfd_link_hash_table_create
8230 #define bfd_elf32_bfd_link_hash_table_create \
8231 ppc_elf_vxworks_link_hash_table_create
8232 #undef elf_backend_add_symbol_hook
8233 #define elf_backend_add_symbol_hook \
8234 ppc_elf_vxworks_add_symbol_hook
8235 #undef elf_backend_link_output_symbol_hook
8236 #define elf_backend_link_output_symbol_hook \
8237 elf_vxworks_link_output_symbol_hook
8238 #undef elf_backend_final_write_processing
8239 #define elf_backend_final_write_processing \
8240 ppc_elf_vxworks_final_write_processing
8241 #undef elf_backend_get_sec_type_attr
8242 #define elf_backend_get_sec_type_attr \
8243 ppc_elf_vxworks_get_sec_type_attr
8244 #undef elf_backend_emit_relocs
8245 #define elf_backend_emit_relocs \
8246 elf_vxworks_emit_relocs
8248 #undef elf32_bed
8249 #define elf32_bed ppc_elf_vxworks_bed