| blob | 0a27ffd32e4aa72fc9171c3b172b3eb1fbf7a094 |
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, 2009 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 relocs for TLS. */
799 /* Computes the load module index of the load module that contains the
800 definition of its TLS sym. */
815 /* Computes a dtv-relative displacement, the difference between the value
816 of sym+add and the base address of the thread-local storage block that
817 contains the definition of sym, minus 0x8000. */
832 /* A 16 bit dtprel reloc. */
847 /* Like DTPREL16, but no overflow. */
862 /* Like DTPREL16_LO, but next higher group of 16 bits. */
877 /* Like DTPREL16_HI, but adjust for low 16 bits. */
892 /* Computes a tp-relative displacement, the difference between the value of
893 sym+add and the value of the thread pointer (r13). */
908 /* A 16 bit tprel reloc. */
923 /* Like TPREL16, but no overflow. */
938 /* Like TPREL16_LO, but next higher group of 16 bits. */
953 /* Like TPREL16_HI, but adjust for low 16 bits. */
968 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
969 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset
970 to the first entry. */
985 /* Like GOT_TLSGD16, but no overflow. */
1000 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */
1015 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */
1030 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
1031 with values (sym+add)@dtpmod and zero, and computes the offset to the
1032 first entry. */
1047 /* Like GOT_TLSLD16, but no overflow. */
1062 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */
1077 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */
1092 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes
1093 the offset to the entry. */
1108 /* Like GOT_DTPREL16, but no overflow. */
1123 /* Like GOT_DTPREL16_LO, but next higher group of 16 bits. */
1138 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */
1153 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the
1154 offset to the entry. */
1169 /* Like GOT_TPREL16, but no overflow. */
1184 /* Like GOT_TPREL16_LO, but next higher group of 16 bits. */
1199 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */
1214 /* The remaining relocs are from the Embedded ELF ABI, and are not
1215 in the SVR4 ELF ABI. */
1217 /* 32 bit value resulting from the addend minus the symbol. */
1232 /* 16 bit value resulting from the addend minus the symbol. */
1247 /* 16 bit value resulting from the addend minus the symbol. */
1262 /* The high order 16 bits of the addend minus the symbol. */
1277 /* The high order 16 bits of the result of the addend minus the address,
1278 plus 1 if the contents of the low 16 bits, treated as a signed number,
1279 is negative. */
1294 /* 16 bit value resulting from allocating a 4 byte word to hold an
1295 address in the .sdata section, and returning the offset from
1296 _SDA_BASE_ for that relocation. */
1311 /* 16 bit value resulting from allocating a 4 byte word to hold an
1312 address in the .sdata2 section, and returning the offset from
1313 _SDA2_BASE_ for that relocation. */
1328 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
1329 small data items. */
1344 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
1345 signed offset from the appropriate base, and filling in the register
1346 field with the appropriate register (0, 2, or 13). */
1361 /* Relocation not handled: R_PPC_EMB_MRKREF */
1362 /* Relocation not handled: R_PPC_EMB_RELSEC16 */
1363 /* Relocation not handled: R_PPC_EMB_RELST_LO */
1364 /* Relocation not handled: R_PPC_EMB_RELST_HI */
1365 /* Relocation not handled: R_PPC_EMB_RELST_HA */
1366 /* Relocation not handled: R_PPC_EMB_BIT_FLD */
1368 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
1369 in the 16 bit signed offset from the appropriate base, and filling in the
1370 register field with the appropriate register (0, 2, or 13). */
1385 /* A 16 bit relative relocation. */
1400 /* A 16 bit relative relocation without overflow. */
1415 /* The high order 16 bits of a relative address. */
1430 /* The high order 16 bits of a relative address, plus 1 if the contents of
1431 the low 16 bits, treated as a signed number, is negative. */
1446 /* GNU extension to record C++ vtable hierarchy. */
1461 /* GNU extension to record C++ vtable member usage. */
1476 /* Phony reloc to handle AIX style TOC entries. */
1490 };
1491 \f
1492 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
1494 static void
1496 {
1501 i++)
1502 {
1508 }
1509 }
1513 bfd_reloc_code_real_type code)
1514 {
1517 /* Initialize howto table if not already done. */
1522 {
1613 }
1616 };
1621 {
1626 i++)
1632 }
1634 /* Set the howto pointer for a PowerPC ELF reloc. */
1636 static void
1640 {
1641 /* Initialize howto table if not already done. */
1648 /* Just because the above assert didn't trigger doesn't mean that
1649 ELF32_R_TYPE (dst->r_info) is necessarily a valid relocation. */
1651 {
1657 }
1658 }
1660 /* Handle the R_PPC_ADDR16_HA and R_PPC_REL16_HA relocs. */
1662 static bfd_reloc_status_type
1670 {
1671 bfd_vma relocation;
1674 {
1677 }
1684 else
1696 }
1698 static bfd_reloc_status_type
1706 {
1707 /* If this is a relocatable link (output_bfd test tells us), just
1708 call the generic function. Any adjustment will be done at final
1709 link time. */
1715 {
1720 }
1722 }
1723 \f
1724 /* Sections created by the linker. */
1727 {
1728 /* Pointer to the bfd section. */
1730 /* Section name. */
1732 /* Associated bss section name. */
1734 /* Associated symbol name. */
1736 /* Associated symbol. */
1740 /* Linked list of allocated pointer entries. This hangs off of the
1741 symbol lists, and provides allows us to return different pointers,
1742 based on different addend's. */
1745 {
1746 /* next allocated pointer for this symbol */
1748 /* offset of pointer from beginning of section */
1749 bfd_vma offset;
1750 /* addend used */
1751 bfd_vma addend;
1752 /* which linker section this is */
1756 struct ppc_elf_obj_tdata
1757 {
1760 /* A mapping from local symbols to offsets into the various linker
1761 sections added. This is index by the symbol index. */
1764 /* Flags used to auto-detect plt type. */
1767 };
1769 #define ppc_elf_tdata(bfd) \
1770 ((struct ppc_elf_obj_tdata *) (bfd)->tdata.any)
1772 #define elf_local_ptr_offsets(bfd) \
1773 (ppc_elf_tdata (bfd)->linker_section_pointers)
1775 #define is_ppc_elf(bfd) \
1776 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
1777 && elf_object_id (bfd) == PPC32_ELF_TDATA)
1779 /* Override the generic function because we store some extras. */
1781 static bfd_boolean
1783 {
1785 PPC32_ELF_TDATA);
1786 }
1788 /* Fix bad default arch selected for a 32 bit input bfd when the
1789 default is 64 bit. */
1791 static bfd_boolean
1793 {
1795 {
1799 {
1800 /* Relies on arch after 64 bit default being 32 bit default. */
1803 }
1804 }
1806 }
1808 /* Function to set whether a module needs the -mrelocatable bit set. */
1810 static bfd_boolean
1812 {
1819 }
1821 /* Support for core dump NOTE sections. */
1823 static bfd_boolean
1825 {
1830 {
1835 /* pr_cursig */
1838 /* pr_pid */
1841 /* pr_reg */
1846 }
1848 /* Make a ".reg/999" section. */
1851 }
1853 static bfd_boolean
1855 {
1857 {
1866 }
1868 /* Note that for some reason, a spurious space is tacked
1869 onto the end of the args in some (at least one anyway)
1870 implementations, so strip it off if it exists. */
1872 {
1878 }
1881 }
1885 {
1887 {
1892 {
1903 }
1906 {
1925 }
1926 }
1927 }
1929 /* Return address for Ith PLT stub in section PLT, for relocation REL
1930 or (bfd_vma) -1 if it should not be included. */
1932 static bfd_vma
1936 {
1938 }
1940 /* Handle a PowerPC specific section when reading an object file. This
1941 is called when bfd_section_from_shdr finds a section with an unknown
1942 type. */
1944 static bfd_boolean
1949 {
1951 flagword flags;
1966 }
1968 /* Set up any other section flags and such that may be necessary. */
1970 static bfd_boolean
1974 {
1982 }
1984 /* If we have .sbss2 or .PPC.EMB.sbss0 output sections, we
1985 need to bump up the number of section headers. */
1987 static int
1990 {
2003 }
2005 /* Add extra PPC sections -- Note, for now, make .sbss2 and
2006 .PPC.EMB.sbss0 a normal section, and not a bss section so
2007 that the linker doesn't crater when trying to make more than
2008 2 sections. */
2011 {
2022 };
2024 /* This is what we want for new plt/got. */
2030 {
2033 /* See if this is one of the special sections. */
2040 {
2044 }
2047 }
2048 \f
2049 /* Very simple linked list structure for recording apuinfo values. */
2051 {
2054 }
2055 apuinfo_list;
2060 static void
2062 {
2064 }
2066 static void
2068 {
2072 {
2076 }
2085 }
2087 static unsigned
2089 {
2094 entry;
2099 }
2103 {
2109 ;
2112 }
2114 static void
2116 {
2120 {
2124 }
2127 }
2132 /* Scan the input BFDs and create a linked list of
2133 the APUinfo values that will need to be emitted. */
2135 static void
2137 {
2142 bfd_size_type output_section_size;
2152 /* Scan the input bfds, looking for apuinfo sections. */
2157 {
2160 {
2163 }
2164 }
2166 /* We need at least one input sections
2167 in order to make merging worthwhile. */
2171 /* Just make sure that the output section exists as well. */
2176 /* Allocate a buffer for the contents of the input sections. */
2184 /* Read in the input sections contents. */
2186 {
2196 {
2199 }
2203 {
2206 }
2208 /* Process the contents of the section. */
2212 /* Verify the contents of the header. Note - we have to
2213 extract the values this way in order to allow for a
2214 host whose endian-ness is different from the target. */
2226 /* Get the number of bytes used for apuinfo entries. */
2231 /* Make sure that we do not run off the end of the section. */
2235 /* Scan the apuinfo section, building a list of apuinfo numbers. */
2239 /* Update the offset. */
2241 }
2245 /* Compute the size of the output section. */
2255 fail:
2260 }
2262 /* Prevent the output section from accumulating the input sections'
2263 contents. We have already stored this in our linked list structure. */
2265 static bfd_boolean
2270 {
2273 }
2275 /* Finally we can generate the output section. */
2277 static void
2279 {
2284 bfd_size_type length;
2299 {
2303 }
2305 /* Create the apuinfo header. */
2314 {
2317 }
2328 }
2329 \f
2330 static bfd_boolean
2332 {
2342 }
2344 static bfd_boolean
2346 {
2351 }
2353 static long
2357 {
2362 bfd_vma stub_vma;
2386 /* Call common code to handle old-style executable PLTs. */
2391 /* If this object was prelinked, the prelinker stored the address
2392 of .glink at got[1]. If it wasn't prelinked, got[1] will be zero. */
2395 {
2409 {
2410 Elf_Internal_Dyn dyn;
2417 {
2425 }
2426 }
2428 }
2430 /* Otherwise we read the first plt entry. */
2432 {
2435 }
2440 /* The .glink section usually does not survive the final
2441 link; search for the section (usually .text) where the
2442 glink stubs now reside. */
2447 /* Determine glink PLT resolver by reading the relative branch
2448 from the first glink stub. */
2451 {
2454 /* The first glink stub may either branch to the resolver ... */
2459 /* ... or fall through a bunch of NOPs. */
2466 {
2469 }
2470 }
2474 /* If the stubs are those for -shared/-pie then we might have
2475 multiple stubs for each plt entry. If that is the case then
2476 there is no way to associate stubs with their plt entries short
2477 of figuring out the GOT pointer value used in the stub. */
2503 {
2507 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
2508 we are defining a symbol, ensure one of them is set. */
2523 }
2525 /* Add a symbol at the start of the glink branch table. */
2534 s++;
2535 count++;
2538 {
2539 /* Add a symbol for the glink PLT resolver. */
2548 s++;
2549 count++;
2550 }
2553 }
2554 \f
2555 /* The following functions are specific to the ELF linker, while
2556 functions above are used generally. They appear in this file more
2557 or less in the order in which they are called. eg.
2558 ppc_elf_check_relocs is called early in the link process,
2559 ppc_elf_finish_dynamic_sections is one of the last functions
2560 called. */
2562 /* The PPC linker needs to keep track of the number of relocs that it
2563 decides to copy as dynamic relocs in check_relocs for each symbol.
2564 This is so that it can later discard them if they are found to be
2565 unnecessary. We store the information in a field extending the
2566 regular ELF linker hash table. */
2568 struct ppc_elf_dyn_relocs
2569 {
2572 /* The input section of the reloc. */
2575 /* Total number of relocs copied for the input section. */
2576 bfd_size_type count;
2578 /* Number of pc-relative relocs copied for the input section. */
2579 bfd_size_type pc_count;
2580 };
2582 /* Track PLT entries needed for a given symbol. We might need more
2583 than one glink entry per symbol. */
2584 struct plt_entry
2585 {
2588 /* -fPIC uses multiple GOT sections, one per file, called ".got2".
2589 This field stores the offset into .got2 used to initialise the
2590 GOT pointer reg. It will always be at least 32768 (and for
2591 current gcc this is the only offset used). */
2592 bfd_vma addend;
2594 /* The .got2 section. */
2597 /* PLT refcount or offset. */
2598 union
2599 {
2600 bfd_signed_vma refcount;
2601 bfd_vma offset;
2604 /* .glink stub offset. */
2605 bfd_vma glink_offset;
2606 };
2608 /* Of those relocs that might be copied as dynamic relocs, this function
2609 selects those that must be copied when linking a shared library,
2610 even when the symbol is local. */
2612 static int
2615 {
2617 {
2634 }
2635 }
2637 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
2638 copying dynamic variables from a shared lib into an app's dynbss
2639 section, and instead use a dynamic relocation to point into the
2640 shared lib. */
2641 #define ELIMINATE_COPY_RELOCS 1
2643 /* PPC ELF linker hash entry. */
2645 struct ppc_elf_link_hash_entry
2646 {
2649 /* If this symbol is used in the linker created sections, the processor
2650 specific backend uses this field to map the field into the offset
2651 from the beginning of the section. */
2654 /* Track dynamic relocs copied for this symbol. */
2657 /* Contexts in which symbol is used in the GOT (or TOC).
2658 TLS_GD .. TLS_TLS bits are or'd into the mask as the
2659 corresponding relocs are encountered during check_relocs.
2660 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
2661 indicate the corresponding GOT entry type is not needed. */
2670 /* Nonzero if we have seen a small data relocation referring to this
2671 symbol. */
2673 };
2675 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent))
2677 /* PPC ELF linker hash table. */
2679 struct ppc_elf_link_hash_table
2680 {
2683 /* Short-cuts to get to dynamic linker sections. */
2696 /* The (unloaded but important) .rela.plt.unloaded on VxWorks. */
2699 /* The .got.plt section (VxWorks only)*/
2702 /* Shortcut to __tls_get_addr. */
2705 /* The bfd that forced an old-style PLT. */
2708 /* TLS local dynamic got entry handling. */
2710 bfd_signed_vma refcount;
2711 bfd_vma offset;
2714 /* Offset of branch table to PltResolve function in glink. */
2715 bfd_vma glink_pltresolve;
2717 /* Size of reserved GOT entries. */
2719 /* Non-zero if allocating the header left a gap. */
2722 /* The type of PLT we have chosen to use. */
2725 /* Set if we should emit symbols for stubs. */
2728 /* True if the target system is VxWorks. */
2731 /* The size of PLT entries. */
2733 /* The distance between adjacent PLT slots. */
2735 /* The size of the first PLT entry. */
2738 /* Small local sym cache. */
2740 };
2742 /* Get the PPC ELF linker hash table from a link_info structure. */
2744 #define ppc_elf_hash_table(p) \
2745 ((struct ppc_elf_link_hash_table *) (p)->hash)
2747 /* Create an entry in a PPC ELF linker hash table. */
2753 {
2754 /* Allocate the structure if it has not already been allocated by a
2755 subclass. */
2757 {
2762 }
2764 /* Call the allocation method of the superclass. */
2767 {
2771 }
2774 }
2776 /* Create a PPC ELF linker hash table. */
2780 {
2788 ppc_elf_link_hash_newfunc,
2790 {
2793 }
2813 }
2815 /* Create .got and the related sections. */
2817 static bfd_boolean
2819 {
2822 flagword flags;
2833 {
2837 }
2838 else
2839 {
2840 /* The powerpc .got has a blrl instruction in it. Mark it
2841 executable. */
2846 }
2853 }
2855 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2856 to output sections (just like _bfd_elf_create_dynamic_sections has
2857 to create .dynbss and .rela.bss). */
2859 static bfd_boolean
2861 {
2864 flagword flags;
2892 {
2899 }
2912 /* The VxWorks PLT is a loaded section with contents. */
2915 }
2917 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2919 static void
2923 {
2930 {
2932 {
2936 /* Add reloc counts against the indirect sym to the direct sym
2937 list. Merge any entries against the same section. */
2939 {
2944 {
2949 }
2952 }
2954 }
2958 }
2963 /* If called to transfer flags for a weakdef during processing
2964 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
2965 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
2977 /* If we were called to copy over info for a weak sym, that's all. */
2981 /* Copy over the GOT refcount entries that we may have already seen to
2982 the symbol which just became indirect. */
2986 /* And plt entries. */
2988 {
2990 {
2995 {
3000 {
3004 }
3007 }
3009 }
3013 }
3016 {
3024 }
3025 }
3027 /* Hook called by the linker routine which adds symbols from an object
3028 file. We use it to put .comm items in .sbss, and not .bss. */
3030 static bfd_boolean
3038 {
3043 {
3044 /* Common symbols less than or equal to -G nn bytes are automatically
3045 put into .sbss. */
3050 {
3058 flags);
3061 }
3065 }
3068 }
3069 \f
3070 static bfd_boolean
3073 {
3082 }
3084 /* Create a special linker section. */
3086 static bfd_boolean
3089 flagword flags,
3091 {
3098 /* Record the first bfd that needs the special sections. */
3104 flags);
3111 }
3113 /* Find a linker generated pointer with a given addend and type. */
3116 elf_find_pointer_linker_section
3118 bfd_vma addend,
3120 {
3126 }
3128 /* Allocate a pointer to live in a linker created section. */
3130 static bfd_boolean
3135 {
3139 bfd_size_type amt;
3143 /* Is this a global symbol? */
3145 {
3148 /* Has this symbol already been allocated? If so, our work is done. */
3152 lsect))
3156 }
3157 else
3158 {
3161 /* Allocation of a pointer to a local symbol. */
3164 /* Allocate a table to hold the local symbols if first time. */
3166 {
3177 }
3179 /* Has this symbol already been allocated? If so, our work is done. */
3182 lsect))
3186 }
3188 /* Allocate space for a pointer in the linker section, and allocate
3189 a new pointer record from internal memory. */
3205 #ifdef DEBUG
3210 #endif
3213 }
3215 static bfd_boolean
3220 {
3225 {
3233 }
3239 }
3241 static bfd_boolean
3244 {
3251 {
3261 }
3264 }
3268 {
3277 }
3279 static void
3281 {
3284 abfd,
3287 }
3289 /* Look through the relocs for a section during the first phase, and
3290 allocate space in the global offset table or procedure linkage
3291 table. */
3293 static bfd_boolean
3298 {
3310 /* Don't do anything special with non-loaded, non-alloced sections.
3311 In particular, any relocs in such sections should not affect GOT
3312 and PLT reference counting (ie. we don't allow them to create GOT
3313 or PLT entries), there's no possibility or desire to optimize TLS
3314 relocs, and there's not much point in propagating relocs to shared
3315 libs that the dynamic linker won't relocate. */
3319 #ifdef DEBUG
3322 #endif
3326 /* Initialize howto table if not already done. */
3340 {
3349 else
3350 {
3355 }
3357 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
3358 This shows up in particular in an R_PPC_ADDR32 in the eabi
3359 startup code. */
3363 {
3369 }
3375 {
3392 /* We have a new-style __tls_get_addr call with a marker
3393 reloc. */
3394 ;
3395 else
3396 /* Mark this section as having an old-style call. */
3399 }
3402 {
3405 /* These special tls relocs tie a call to __tls_get_addr with
3406 its parameter symbol. */
3437 dogottls:
3439 /* Fall thru */
3441 /* GOT16 relocations */
3446 /* This symbol requires a global offset table entry. */
3448 {
3453 }
3455 {
3458 }
3459 else
3460 /* This is a global offset table entry for a local symbol. */
3465 /* Indirect .sdata relocation. */
3468 {
3471 }
3480 {
3483 }
3486 /* Indirect .sdata2 relocation. */
3489 {
3492 }
3501 {
3504 }
3509 {
3512 }
3517 {
3520 }
3525 {
3528 }
3533 {
3536 }
3542 {
3545 }
3553 {
3556 }
3565 {
3568 }
3576 /* Fall through */
3582 #ifdef DEBUG
3584 #endif
3585 /* This symbol requires a procedure linkage table entry. We
3586 actually build the entry in finish_dynamic_symbol,
3587 because this might be a case of linking PIC code without
3588 linking in any dynamic objects, in which case we don't
3589 need to generate a procedure linkage table after all. */
3592 {
3593 /* It does not make sense to have a procedure linkage
3594 table entry for a local symbol. */
3597 abfd,
3598 sec,
3603 }
3604 else
3605 {
3609 {
3612 }
3617 }
3620 /* The following relocations don't need to propagate the
3621 relocation if linking a shared object since they are
3622 section relative. */
3641 /* These are just markers. */
3652 /* These should only appear in dynamic objects. */
3659 /* These aren't handled yet. We'll report an error later. */
3668 /* This refers only to functions defined in the shared library. */
3671 {
3674 }
3677 /* This relocation describes the C++ object vtable hierarchy.
3678 Reconstruct it for later use during GC. */
3684 /* This relocation describes which C++ vtable entries are actually
3685 used. Record for later use during GC. */
3693 /* We shouldn't really be seeing these. */
3703 /* Nor these. */
3714 {
3715 /* Old -fPIC gcc code has .long LCTOC1-LCFx just before
3716 the start of a function, which assembles to a REL32
3717 reference to .got2. If we detect one of these, then
3718 force the old PLT layout because the linker cannot
3719 reliably deduce the GOT pointer value needed for
3720 PLT call stubs. */
3731 {
3734 }
3735 }
3738 /* fall through */
3748 {
3749 /* We may need a plt entry if the symbol turns out to be
3750 a function defined in a dynamic object. */
3754 /* We may need a copy reloc too. */
3757 }
3767 {
3769 {
3772 }
3774 }
3775 /* fall through */
3782 {
3783 /* We may need a plt entry if the symbol turns out to be
3784 a function defined in a dynamic object. */
3788 }
3790 dodyn:
3791 /* If we are creating a shared library, and this is a reloc
3792 against a global symbol, or a non PC relative reloc
3793 against a local symbol, then we need to copy the reloc
3794 into the shared library. However, if we are linking with
3795 -Bsymbolic, we do not need to copy a reloc against a
3796 global symbol which is defined in an object we are
3797 including in the link (i.e., DEF_REGULAR is set). At
3798 this point we have not seen all the input files, so it is
3799 possible that DEF_REGULAR is not set now but will be set
3800 later (it is never cleared). In case of a weak definition,
3801 DEF_REGULAR may be cleared later by a strong definition in
3802 a shared library. We account for that possibility below by
3803 storing information in the dyn_relocs field of the hash
3804 table entry. A similar situation occurs when creating
3805 shared libraries and symbol visibility changes render the
3806 symbol local.
3808 If on the other hand, we are creating an executable, we
3809 may need to keep relocations for symbols satisfied by a
3810 dynamic library if we manage to avoid copy relocs for the
3811 symbol. */
3818 || (ELIMINATE_COPY_RELOCS
3823 {
3827 #ifdef DEBUG
3829 "ppc_elf_check_relocs needs to "
3833 #endif
3835 {
3839 sreloc = _bfd_elf_make_dynamic_reloc_section
3844 }
3846 /* If this is a global symbol, we count the number of
3847 relocations we need for this symbol. */
3849 {
3851 }
3852 else
3853 {
3854 /* Track dynamic relocs needed for local syms too.
3855 We really need local syms available to do this
3856 easily. Oh well. */
3872 }
3876 {
3885 }
3890 }
3893 }
3894 }
3897 }
3898 \f
3900 /* Merge object attributes from IBFD into OBFD. Raise an error if
3901 there are conflicting attributes. */
3902 static bfd_boolean
3904 {
3909 {
3910 /* This is the first object. Copy the attributes. */
3913 /* Use the Tag_null value to indicate the attributes have been
3914 initialized. */
3918 }
3923 /* Check for conflicting Tag_GNU_Power_ABI_FP attributes and merge
3924 non-conflicting ones. */
3928 {
3933 ;
3935 _bfd_error_handler
3938 _bfd_error_handler
3942 _bfd_error_handler
3946 _bfd_error_handler
3950 _bfd_error_handler
3953 _bfd_error_handler
3956 else
3957 _bfd_error_handler
3960 }
3962 /* Check for conflicting Tag_GNU_Power_ABI_Vector attributes and
3963 merge non-conflicting ones. */
3967 {
3971 {
3975 }
3978 {
3982 }
3988 ;
3989 /* For now, allow generic to transition to AltiVec or SPE
3990 without a warning. If GCC marked files with their stack
3991 alignment and used don't-care markings for files which are
3992 not affected by the vector ABI, we could warn about this
3993 case too. */
3997 ;
3999 _bfd_error_handler
4003 _bfd_error_handler
4006 else
4007 _bfd_error_handler
4010 }
4012 /* Check for conflicting Tag_GNU_Power_ABI_Struct_Return attributes
4013 and merge non-conflicting ones. */
4017 {
4022 ;
4024 _bfd_error_handler
4027 _bfd_error_handler
4030 _bfd_error_handler
4033 else
4034 _bfd_error_handler
4037 }
4039 /* Merge Tag_compatibility attributes and any common GNU ones. */
4043 }
4045 /* Merge backend specific data from an object file to the output
4046 object file when linking. */
4048 static bfd_boolean
4050 {
4051 flagword old_flags;
4052 flagword new_flags;
4053 bfd_boolean error;
4058 /* Check if we have the same endianess. */
4068 {
4069 /* First call, no flags set. */
4072 }
4074 /* Compatible flags are ok. */
4076 ;
4078 /* Incompatible flags. */
4079 else
4080 {
4081 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
4082 to be linked with either. */
4086 {
4091 }
4094 {
4099 }
4101 /* The output is -mrelocatable-lib iff both the input files are. */
4105 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
4106 but each input file is either -mrelocatable or -mrelocatable-lib. */
4112 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
4113 any module uses it. */
4119 /* Warn about any other mismatches. */
4121 {
4127 }
4130 {
4133 }
4134 }
4137 }
4138 \f
4139 /* Choose which PLT scheme to use, and set .plt flags appropriately.
4140 Returns -1 on error, 0 for old PLT, 1 for new PLT. */
4141 int
4146 {
4148 flagword flags;
4153 {
4156 else
4157 {
4161 /* Look through the reloc flags left by ppc_elf_check_relocs.
4162 Use the old style bss plt if a file makes plt calls
4163 without using the new relocs, and if ld isn't given
4164 --secure-plt and we never see REL16 relocs. */
4169 {
4173 {
4177 }
4178 }
4180 }
4181 }
4190 {
4194 /* The new PLT is a loaded section. */
4199 /* The new GOT is not executable. */
4203 }
4204 else
4205 {
4206 /* Stop an unused .glink section from affecting .text alignment. */
4210 }
4212 }
4213 \f
4214 /* Return the section that should be marked against GC for a given
4215 relocation. */
4223 {
4226 {
4230 }
4233 }
4235 /* Update the got, plt and dynamic reloc reference counts for the
4236 section being removed. */
4238 static bfd_boolean
4243 {
4267 {
4274 {
4286 {
4287 /* Everything must go for SEC. */
4290 }
4291 }
4295 {
4317 {
4320 }
4322 {
4325 }
4335 /* Fall thru */
4358 {
4364 }
4369 }
4370 }
4372 }
4373 \f
4374 /* Set plt output section type, htab->tls_get_addr, and call the
4375 generic ELF tls_setup function. */
4377 asection *
4379 {
4386 {
4389 }
4394 }
4396 /* Return TRUE iff REL is a branch reloc with a global symbol matching
4397 HASH. */
4399 static bfd_boolean
4403 {
4419 {
4429 }
4431 }
4433 /* Run through all the TLS relocs looking for optimization
4434 opportunities. */
4436 bfd_boolean
4439 {
4449 /* Make two passes through the relocs. First time check that tls
4450 relocs involved in setting up a tls_get_addr call are indeed
4451 followed by such a call. If they are not, exclude them from
4452 the optimizations done on the second pass. */
4455 {
4461 {
4464 /* Read the relocations. */
4472 {
4478 bfd_boolean is_local;
4484 {
4492 }
4502 {
4506 /* Fall thru */
4510 /* These relocs should never be against a symbol
4511 defined in a shared lib. Leave them alone if
4512 that turns out to be the case. */
4516 /* LD -> LE */
4524 /* Fall thru */
4529 /* GD -> LE */
4531 else
4532 /* GD -> IE */
4542 {
4543 /* IE -> LE */
4547 }
4548 else
4553 }
4556 {
4566 /* Uh oh, we didn't find the expected call. We
4567 could just mark this symbol to exclude it
4568 from tls optimization but it's safer to skip
4569 the entire section. */
4572 }
4575 {
4578 }
4579 else
4580 {
4586 {
4593 {
4597 }
4598 }
4606 }
4609 {
4610 /* We managed to get rid of a got entry. */
4613 }
4616 {
4623 }
4627 }
4631 }
4635 {
4638 else
4640 }
4641 }
4643 }
4644 \f
4645 /* Return true if we have dynamic relocs that apply to read-only sections. */
4647 static bfd_boolean
4649 {
4653 {
4660 }
4662 }
4664 /* Adjust a symbol defined by a dynamic object and referenced by a
4665 regular object. The current definition is in some section of the
4666 dynamic object, but we're not including those sections. We have to
4667 change the definition to something the rest of the link can
4668 understand. */
4670 static bfd_boolean
4673 {
4677 #ifdef DEBUG
4680 #endif
4682 /* Make sure we know what is going on here. */
4691 /* Deal with function syms. */
4694 {
4695 /* Clear procedure linkage table information for any symbol that
4696 won't need a .plt entry. */
4705 {
4706 /* A PLT entry is not required/allowed when:
4708 1. We are not using ld.so; because then the PLT entry
4709 can't be set up, so we can't use one. In this case,
4710 ppc_elf_adjust_dynamic_symbol won't even be called.
4712 2. GC has rendered the entry unused.
4714 3. We know for certain that a call to this symbol
4715 will go to this object, or will remain undefined. */
4718 }
4719 else
4720 {
4721 /* After adjust_dynamic_symbol, non_got_ref set means that
4722 dyn_relocs for this symbol should be discarded.
4723 If we get here we know we are making a PLT entry for this
4724 symbol, and in an executable we'd normally resolve
4725 relocations against this symbol to the PLT entry. Allow
4726 dynamic relocs if the reference is weak, and the dynamic
4727 relocs will not cause text relocation. */
4734 }
4736 }
4737 else
4740 /* If this is a weak symbol, and there is a real definition, the
4741 processor independent code will have arranged for us to see the
4742 real definition first, and we can just use the same value. */
4744 {
4752 }
4754 /* This is a reference to a symbol defined by a dynamic object which
4755 is not a function. */
4757 /* If we are creating a shared library, we must presume that the
4758 only references to the symbol are via the global offset table.
4759 For such cases we need not do anything here; the relocations will
4760 be handled correctly by relocate_section. */
4764 /* If there are no references to this symbol that do not use the
4765 GOT, we don't need to generate a copy reloc. */
4769 /* If we didn't find any dynamic relocs in read-only sections, then
4770 we'll be keeping the dynamic relocs and avoiding the copy reloc.
4771 We can't do this if there are any small data relocations. This
4772 doesn't work on VxWorks, where we can not have dynamic
4773 relocations (other than copy and jump slot relocations) in an
4774 executable. */
4780 {
4783 }
4786 {
4790 }
4792 /* We must allocate the symbol in our .dynbss section, which will
4793 become part of the .bss section of the executable. There will be
4794 an entry for this symbol in the .dynsym section. The dynamic
4795 object will contain position independent code, so all references
4796 from the dynamic object to this symbol will go through the global
4797 offset table. The dynamic linker will use the .dynsym entry to
4798 determine the address it must put in the global offset table, so
4799 both the dynamic object and the regular object will refer to the
4800 same memory location for the variable.
4802 Of course, if the symbol is referenced using SDAREL relocs, we
4803 must instead allocate it in .sbss. */
4807 else
4811 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
4812 copy the initial value out of the dynamic object and into the
4813 runtime process image. We need to remember the offset into the
4814 .rela.bss section we are going to use. */
4816 {
4821 else
4826 }
4829 }
4830 \f
4831 /* Generate a symbol to mark plt call stubs. For non-PIC code the sym is
4832 xxxxxxxx.plt_call32.<callee> where xxxxxxxx is a hex number, usually 0,
4833 specifying the addend on the plt relocation. For -fpic code, the sym
4834 is xxxxxxxx.plt_pic32.<callee>, and for -fPIC
4835 xxxxxxxx.got2.plt_pic32.<callee>. */
4837 static bfd_boolean
4841 {
4850 else
4870 {
4879 }
4881 }
4883 /* Allocate NEED contiguous space in .got, and return the offset.
4884 Handles allocation of the got header when crossing 32k. */
4886 static bfd_vma
4888 {
4889 bfd_vma where;
4893 {
4896 }
4897 else
4898 {
4901 {
4904 }
4905 else
4906 {
4909 {
4912 }
4915 }
4916 }
4918 }
4920 /* Allocate space in associated reloc sections for dynamic relocs. */
4922 static bfd_boolean
4924 {
4934 /* When warning symbols are created, they **replace** the "real"
4935 entry in the hash table, thus we never get to see the real
4936 symbol in a hash traversal. So look at it now. */
4941 {
4948 {
4949 /* Make sure this symbol is output as a dynamic symbol. */
4952 {
4955 }
4959 {
4963 {
4965 {
4968 }
4973 {
4976 }
4981 {
4984 }
4990 }
4991 else
4992 {
4994 {
4995 /* If this is the first .plt entry, make room
4996 for the special first entry. */
5000 /* The PowerPC PLT is actually composed of two
5001 parts, the first part is 2 words (for a load
5002 and a jump), and then there is a remaining
5003 word available at the end. */
5010 /* If this symbol is not defined in a regular
5011 file, and we are not generating a shared
5012 library, then set the symbol to this location
5013 in the .plt. This is required to make
5014 function pointers compare as equal between
5015 the normal executable and the shared library. */
5019 {
5022 }
5024 /* Make room for this entry. */
5026 /* After the 8192nd entry, room for two entries
5027 is allocated. */
5033 }
5035 }
5037 /* We also need to make an entry in the .rela.plt section. */
5039 {
5043 {
5044 /* Allocate space for the unloaded relocations. */
5046 {
5049 {
5053 }
5058 }
5060 /* Every PLT entry has an associated GOT entry in
5061 .got.plt. */
5063 }
5065 }
5066 }
5067 else
5069 }
5070 else
5074 {
5077 }
5078 }
5079 else
5080 {
5083 }
5087 {
5088 bfd_boolean dyn;
5091 /* Make sure this symbol is output as a dynamic symbol. */
5095 {
5098 }
5102 {
5104 {
5106 /* We'll just use htab->tlsld_got.offset. This should
5107 always be the case. It's a little odd if we have
5108 a local dynamic reloc against a non-local symbol. */
5110 else
5112 }
5119 }
5120 else
5124 else
5125 {
5132 {
5133 /* All the entries we allocated need relocs.
5134 Except LD only needs one. */
5139 }
5140 }
5141 }
5142 else
5149 /* In the shared -Bsymbolic case, discard space allocated for
5150 dynamic pc-relative relocs against symbols which turn out to be
5151 defined in regular objects. For the normal shared case, discard
5152 space for relocs that have become local due to symbol visibility
5153 changes. */
5156 {
5157 /* Relocs that use pc_count are those that appear on a call insn,
5158 or certain REL relocs (see must_be_dyn_reloc) that can be
5159 generated via assembly. We want calls to protected symbols to
5160 resolve directly to the function rather than going via the plt.
5161 If people want function pointer comparisons to work as expected
5162 then they should avoid writing weird assembly. */
5164 {
5168 {
5173 else
5175 }
5176 }
5179 {
5183 {
5186 else
5188 }
5189 }
5191 /* Discard relocs on undefined symbols that must be local. */
5198 /* Also discard relocs on undefined weak syms with non-default
5199 visibility. */
5202 {
5206 /* Make sure undefined weak symbols are output as a dynamic
5207 symbol in PIEs. */
5210 {
5213 }
5214 }
5215 }
5217 {
5218 /* For the non-shared case, discard space for relocs against
5219 symbols which turn out to need copy relocs or are not
5220 dynamic. */
5224 {
5225 /* Make sure this symbol is output as a dynamic symbol.
5226 Undefined weak syms won't yet be marked as dynamic. */
5229 {
5232 }
5234 /* If that succeeded, we know we'll be keeping all the
5235 relocs. */
5238 }
5242 keep: ;
5243 }
5245 /* Finally, allocate space. */
5247 {
5250 }
5253 }
5255 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
5256 read-only sections. */
5258 static bfd_boolean
5260 {
5268 {
5271 /* Not an error, just cut short the traversal. */
5273 }
5275 }
5277 /* Set the sizes of the dynamic sections. */
5279 static bfd_boolean
5282 {
5285 bfd_boolean relocs;
5288 #ifdef DEBUG
5290 #endif
5296 {
5297 /* Set the contents of the .interp section to the interpreter. */
5299 {
5304 }
5305 }
5312 /* Set up .got offsets for local syms, and space for local dynamic
5313 relocs. */
5315 {
5319 bfd_size_type locsymcount;
5326 {
5333 {
5336 {
5337 /* Input section has been discarded, either because
5338 it is a copy of a linkonce section or due to
5339 linker script /DISCARD/, so we'll be discarding
5340 the relocs too. */
5341 }
5345 {
5346 /* Relocations in vxworks .tls_vars sections are
5347 handled specially by the loader. */
5348 }
5350 {
5357 }
5358 }
5359 }
5371 {
5374 {
5383 }
5384 else
5388 else
5389 {
5394 }
5395 }
5396 else
5398 }
5400 /* Allocate space for global sym dynamic relocs. */
5404 {
5408 }
5409 else
5413 {
5416 /* If we haven't allocated the header, do so now. When we get here,
5417 for old plt/got the got size will be 0 to 32764 (not allocated),
5418 or 32780 to 65536 (header allocated). For new plt/got, the
5419 corresponding ranges are 0 to 32768 and 32780 to 65536. */
5421 {
5426 }
5429 }
5432 {
5434 /* Space for the branch table. */
5436 /* Pad out to align the start of PLTresolve. */
5441 {
5448 {
5457 }
5463 {
5472 }
5473 }
5474 }
5476 /* We've now determined the sizes of the various dynamic sections.
5477 Allocate memory for them. */
5480 {
5493 {
5494 /* We'd like to strip these sections if they aren't needed, but if
5495 we've exported dynamic symbols from them we must leave them.
5496 It's too late to tell BFD to get rid of the symbols. */
5499 /* Strip this section if we don't need it; see the
5500 comment below. */
5501 }
5504 {
5505 /* Strip these too. */
5506 }
5508 {
5510 {
5511 /* Remember whether there are any relocation sections. */
5514 /* We use the reloc_count field as a counter if we need
5515 to copy relocs into the output file. */
5517 }
5518 }
5519 else
5520 {
5521 /* It's not one of our sections, so don't allocate space. */
5523 }
5526 {
5527 /* If we don't need this section, strip it from the
5528 output file. This is mostly to handle .rela.bss and
5529 .rela.plt. We must create both sections in
5530 create_dynamic_sections, because they must be created
5531 before the linker maps input sections to output
5532 sections. The linker does that before
5533 adjust_dynamic_symbol is called, and it is that
5534 function which decides whether anything needs to go
5535 into these sections. */
5538 }
5543 /* Allocate memory for the section contents. */
5547 }
5550 {
5551 /* Add some entries to the .dynamic section. We fill in the
5552 values later, in ppc_elf_finish_dynamic_sections, but we
5553 must add the entries now so that we get the correct size for
5554 the .dynamic section. The DT_DEBUG entry is filled in by the
5555 dynamic linker and used by the debugger. */
5556 #define add_dynamic_entry(TAG, VAL) \
5557 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
5560 {
5563 }
5566 {
5572 }
5575 {
5578 }
5581 {
5586 }
5588 /* If any dynamic relocs apply to a read-only section, then we
5589 need a DT_TEXTREL entry. */
5592 info);
5595 {
5598 }
5602 }
5603 #undef add_dynamic_entry
5606 }
5608 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5610 static bfd_boolean
5612 {
5620 }
5621 \f
5622 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
5625 {
5634 };
5637 {
5642 };
5644 static bfd_boolean
5649 {
5650 struct one_fixup
5651 {
5654 bfd_vma toff;
5655 bfd_vma trampoff;
5656 };
5666 bfd_size_type trampoff;
5671 /* Nothing to do if there are no relocations, and no need to do
5672 anything with non-alloc sections. */
5678 /* We cannot represent the required PIC relocs in the output, so don't
5679 do anything. The linker doesn't support mixing -shared and -r
5680 anyway. */
5685 /* Space for a branch around any trampolines. */
5690 /* Get a copy of the native relocations. */
5701 {
5713 {
5728 }
5730 /* Get the value of the symbol referred to by the reloc. */
5732 {
5733 /* A local symbol. */
5736 /* Read this BFD's local symbols. */
5738 {
5746 }
5754 else
5759 }
5760 else
5761 {
5762 /* Global symbol handling. */
5777 {
5782 {
5784 {
5787 }
5788 else
5789 {
5792 }
5793 }
5794 }
5796 ;
5799 {
5802 }
5805 {
5808 }
5809 else
5813 }
5815 /* If the branch and target are in the same section, you have
5816 no hope of adding stubs. We'll error out later should the
5817 branch overflow. */
5821 /* There probably isn't any reason to handle symbols in
5822 SEC_MERGE sections; SEC_MERGE doesn't seem a likely
5823 attribute for a code section, and we are only looking at
5824 branches. However, implement it correctly here as a
5825 reference for other target relax_section functions. */
5827 {
5828 /* At this stage in linking, no SEC_MERGE symbol has been
5829 adjusted, so all references to such symbols need to be
5830 passed through _bfd_merged_section_offset. (Later, in
5831 relocate_section, all SEC_MERGE symbols *except* for
5832 section symbols have been adjusted.)
5834 gas may reduce relocations against symbols in SEC_MERGE
5835 sections to a relocation against the section symbol when
5836 the original addend was zero. When the reloc is against
5837 a section symbol we should include the addend in the
5838 offset passed to _bfd_merged_section_offset, since the
5839 location of interest is the original symbol. On the
5840 other hand, an access to "sym+addend" where "sym" is not
5841 a section symbol should not include the addend; Such an
5842 access is presumed to be an offset from "sym"; The
5843 location of interest is just "sym". */
5849 toff);
5853 }
5854 /* PLTREL24 addends are special. */
5858 /* Attempted -shared link of non-pic code loses. */
5867 /* If the branch is in range, no need to do anything. */
5870 /* A relocatable link may have sections moved during
5871 final link, so do not presume they remain in range. */
5876 /* Look for an existing fixup to this address. */
5882 {
5888 /* Oh dear, we can't reach a trampoline. Don't try to add
5889 one. We'll report an error later. */
5893 {
5897 }
5898 else
5899 {
5903 }
5912 /* Hijack the old relocation. Since we need two
5913 relocations for this use a "composite" reloc. */
5915 stub_rtype);
5920 /* Record the fixup so we don't do it again this section. */
5929 changes++;
5930 }
5931 else
5932 {
5937 /* Nop out the reloc, since we're finalizing things here. */
5939 }
5941 /* Get the section contents. */
5943 {
5944 /* Get cached copy if it exists. */
5947 else
5948 {
5949 /* Go get them off disk. */
5952 }
5953 }
5955 /* Fix up the existing branch to hit the trampoline. */
5958 {
5976 }
5977 }
5979 /* Write out the trampolines. */
5981 {
5984 bfd_vma val;
5987 do
5988 {
5992 }
6000 /* Branch around the trampolines. */
6008 {
6011 }
6012 else
6013 {
6016 }
6020 {
6022 i++;
6026 }
6028 }
6032 {
6035 else
6036 {
6037 /* Cache the symbols for elf_link_input_bfd. */
6039 }
6040 }
6044 {
6047 else
6048 {
6049 /* Cache the section contents for elf_link_input_bfd. */
6051 }
6052 }
6055 {
6056 /* Append sufficient NOP relocs so we can write out relocation
6057 information for the trampolines. */
6067 {
6071 }
6078 }
6084 {
6085 /* Convert the internal relax relocs to external form. */
6088 {
6091 /* Rewrite the reloc and convert one of the trailing nop
6092 relocs to describe this relocation. */
6094 /* The relocs are at the bottom 2 bytes */
6100 irel++;
6101 }
6102 }
6106 error_return:
6116 }
6117 \f
6118 /* What to do when ld finds relocations against symbols defined in
6119 discarded sections. */
6121 static unsigned int
6123 {
6131 }
6132 \f
6133 /* Fill in the address for a pointer generated in a linker section. */
6135 static bfd_vma
6139 bfd_vma relocation,
6141 {
6147 {
6148 /* Handle global symbol. */
6154 }
6155 else
6156 {
6157 /* Handle local symbol. */
6163 }
6167 lsect);
6170 /* Offset will always be a multiple of four, so use the bottom bit
6171 as a "written" flag. */
6173 {
6178 }
6184 #ifdef DEBUG
6188 #endif
6190 /* Subtract out the addend, because it will get added back in by the normal
6191 processing. */
6193 }
6195 /* The RELOCATE_SECTION function is called by the ELF backend linker
6196 to handle the relocations for a section.
6198 The relocs are always passed as Rela structures; if the section
6199 actually uses Rel structures, the r_addend field will always be
6200 zero.
6202 This function is responsible for adjust the section contents as
6203 necessary, and (if using Rela relocs and generating a
6204 relocatable output file) adjusting the reloc addend as
6205 necessary.
6207 This function does not have to worry about setting the reloc
6208 address or the reloc symbol index.
6210 LOCAL_SYMS is a pointer to the swapped in local symbols.
6212 LOCAL_SECTIONS is an array giving the section in the input file
6213 corresponding to the st_shndx field of each local symbol.
6215 The global hash table entry for the global symbols can be found
6216 via elf_sym_hashes (input_bfd).
6218 When generating relocatable output, this function must handle
6219 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
6220 going to be the section symbol corresponding to the output
6221 section, which means that the addend must be adjusted
6222 accordingly. */
6224 static bfd_boolean
6233 {
6239 Elf_Internal_Rela outrel;
6245 bfd_boolean is_vxworks_tls;
6247 #ifdef DEBUG
6253 #endif
6257 /* Initialize howto table if not already done. */
6265 /* We have to handle relocations in vxworks .tls_vars sections
6266 specially, because the dynamic loader is 'weird'. */
6273 {
6275 bfd_vma addend;
6276 bfd_reloc_status_type r;
6283 bfd_vma relocation;
6285 bfd_boolean unresolved_reloc;
6286 bfd_boolean warned;
6298 {
6304 }
6305 else
6306 {
6313 }
6316 {
6317 /* For relocs against symbols from removed linkonce sections,
6318 or sections discarded by a linker script, we just want the
6319 section contents zeroed. Avoid any special processing. */
6327 }
6330 {
6334 {
6335 /* R_PPC_PLTREL24 is rather special. If non-zero, the
6336 addend specifies the GOT pointer offset within .got2. */
6338 }
6340 }
6342 /* TLS optimizations. Replace instruction sequences and relocs
6343 based on information we collected in tls_optimize. We edit
6344 RELOCS so that --emit-relocs will output something sensible
6345 for the final instruction stream. */
6351 {
6355 }
6357 /* Ensure reloc mapping code below stays sane. */
6368 {
6376 {
6377 bfd_vma insn;
6384 }
6390 {
6399 else
6402 /* add -> addi. */
6408 /* load and store indexed -> dform. */
6412 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
6417 /* lwax -> lwa. */
6419 else
6426 /* Was PPC_TLS which sits on insn boundary, now
6427 PPC_TPREL16_LO which is at low-order half-word. */
6429 }
6442 {
6443 tls_gdld_hi:
6447 else
6448 {
6452 }
6454 }
6467 {
6469 bfd_vma offset;
6471 tls_ldgd_opt:
6473 /* If not using the newer R_PPC_TLSGD/LD to mark
6474 __tls_get_addr calls, we must trust that the call
6475 stays with its arg setup insns, ie. that the next
6476 reloc is the __tls_get_addr call associated with
6477 the current reloc. Edit both insns. */
6484 {
6485 /* IE */
6491 {
6494 R_PPC_NONE);
6497 }
6501 }
6502 else
6503 {
6504 /* LE */
6507 {
6508 /* Was an LD reloc. */
6511 r_symndx++)
6521 }
6525 {
6531 }
6532 }
6536 {
6537 /* We changed the symbol on an LD reloc. Start over
6538 in order to get h, sym, sec etc. right. */
6539 rel--;
6541 }
6542 }
6547 {
6552 {
6553 /* IE */
6556 }
6557 else
6558 {
6559 /* LE */
6563 }
6566 /* Zap the reloc on the _tls_get_addr call too. */
6569 R_PPC_NONE);
6570 }
6575 {
6580 r_symndx++)
6596 /* Zap the reloc on the _tls_get_addr call too. */
6599 R_PPC_NONE);
6600 rel--;
6602 }
6604 }
6606 /* Handle other relocations that tweak non-addend part of insn. */
6609 {
6613 /* Branch taken prediction relocations. */
6617 /* Fall thru */
6619 /* Branch not taken prediction relocations. */
6630 /* Invert 'y' bit if not the default. */
6636 }
6644 {
6663 /* GOT16 relocations. Like an ADDR16 using the symbol's
6664 address in the GOT as relocation value instead of the
6665 symbol's value itself. Also, create a GOT entry for the
6666 symbol and put the symbol value there. */
6700 dogot:
6701 {
6702 /* Relocation is to the entry for this symbol in the global
6703 offset table. */
6704 bfd_vma off;
6717 {
6718 bfd_boolean dyn;
6723 /* This is actually a static link, or it is a
6724 -Bsymbolic link and the symbol is defined
6725 locally, or the symbol was forced to be local
6726 because of a version file. */
6727 ;
6728 else
6729 {
6732 }
6734 }
6735 else
6736 {
6740 }
6742 /* The offset must always be a multiple of 4. We use the
6743 least significant bit to record whether we have already
6744 processed this entry. */
6748 else
6749 {
6760 /* We might have multiple got entries for this sym.
6761 Initialize them all. */
6762 do
6763 {
6767 {
6770 }
6772 {
6775 }
6777 {
6780 }
6782 {
6785 }
6787 /* Generate relocs for the dynamic linker. */
6793 {
6799 {
6802 {
6809 outrel.r_info
6811 }
6812 }
6819 else
6822 {
6826 }
6831 }
6833 /* Init the .got section contents if we're not
6834 emitting a reloc. */
6835 else
6836 {
6842 {
6848 {
6852 }
6853 }
6856 }
6861 }
6866 }
6872 {
6874 {
6880 {
6884 {
6887 }
6888 }
6889 }
6890 }
6894 + off
6897 /* Addends on got relocations don't make much sense.
6898 x+off@got is actually x@got+off, and since the got is
6899 generated by a hash table traversal, the value in the
6900 got at entry m+n bears little relation to the entry m. */
6904 input_bfd,
6905 input_section,
6908 sym_name);
6909 }
6912 /* Relocations that need no special processing. */
6914 /* It makes no sense to point a local relocation
6915 at a symbol not in this object. */
6917 {
6920 input_bfd,
6921 input_section,
6923 TRUE))
6926 }
6936 /* Relocations that may need to be propagated if this is a shared
6937 object. */
6943 /* The TPREL16 relocs shouldn't really be used in shared
6944 libs as they will result in DT_TEXTREL being set, but
6945 support them anyway. */
6970 /* fall through */
6985 /* If these relocations are not to a named symbol, they can be
6986 handled right here, no need to bother the dynamic linker. */
6990 /* fall through */
6998 /* fall through */
7000 dodyn:
7014 || (ELIMINATE_COPY_RELOCS
7020 {
7023 #ifdef DEBUG
7028 #endif
7030 /* When generating a shared object, these relocations
7031 are copied into the output file to be resolved at run
7032 time. */
7034 {
7035 sreloc = _bfd_elf_get_dynamic_reloc_section
7039 }
7057 {
7061 }
7062 else
7063 {
7068 else
7069 {
7073 ;
7075 {
7078 }
7079 else
7080 {
7083 /* We are turning this relocation into one
7084 against a section symbol. It would be
7085 proper to subtract the symbol's value,
7086 osec->vma, from the emitted reloc addend,
7087 but ld.so expects buggy relocs. */
7091 {
7094 }
7096 #ifdef DEBUG
7101 #endif
7102 }
7105 }
7106 }
7115 /* This reloc will be computed at runtime. We clear the memory
7116 so that it contains predictable value. */
7120 {
7124 }
7125 }
7130 {
7137 else
7141 }
7144 /* Fall thru */
7150 /* Fall thru */
7153 relax32:
7154 {
7161 /* We're clearing the bits for R_PPC_ADDR16_HA
7162 and R_PPC_ADDR16_LO here. */
7166 /* t0 is HA, t1 is LO */
7174 /* Rewrite the reloc and convert one of the trailing nop
7175 relocs to describe this relocation. */
7177 /* The relocs are at the bottom 2 bytes */
7183 rel++;
7184 }
7187 /* Indirect .sdata relocation. */
7190 relocation
7195 /* Indirect .sdata2 relocation. */
7198 relocation
7203 /* Handle the TOC16 reloc. We want to use the offset within the .got
7204 section, not the actual VMA. This is appropriate when generating
7205 an embedded ELF object, for which the .got section acts like the
7206 AIX .toc section. */
7209 {
7212 }
7222 /* Relocation is to the entry for this symbol in the
7223 procedure linkage table. */
7224 {
7230 {
7231 /* We didn't make a PLT entry for this symbol. This
7232 happens when statically linking PIC code, or when
7233 using -Bsymbolic. */
7235 }
7242 else
7246 }
7249 /* Relocate against _SDA_BASE_. */
7251 {
7255 {
7258 }
7265 {
7269 input_bfd,
7270 sym_name,
7272 name);
7273 }
7275 }
7278 /* Relocate against _SDA2_BASE_. */
7280 {
7284 {
7287 }
7292 {
7296 input_bfd,
7297 sym_name,
7299 name);
7304 }
7306 }
7309 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
7312 {
7317 {
7320 }
7327 {
7330 }
7333 {
7336 }
7339 {
7341 }
7342 else
7343 {
7347 input_bfd,
7348 sym_name,
7350 name);
7355 }
7362 }
7363 }
7366 /* Relocate against the beginning of the section. */
7372 {
7375 }
7379 /* Negative relocations. */
7405 input_bfd,
7407 sym_name);
7412 }
7414 /* Do any further special processing. */
7416 {
7427 /* It's just possible that this symbol is a weak symbol
7428 that's not actually defined anywhere. In that case,
7429 'sec' would be NULL, and we should leave the symbol
7430 alone (it will be set to zero elsewhere in the link). */
7433 /* Fall thru */
7441 /* Add 0x10000 if sign bit in 0:15 is set.
7442 Bits 0:15 are not used. */
7445 }
7447 #ifdef DEBUG
7452 sym_name,
7453 r_symndx,
7456 #endif
7461 {
7464 input_bfd,
7465 input_section,
7468 sym_name);
7470 }
7473 input_bfd,
7474 input_section,
7475 contents,
7477 relocation,
7478 addend);
7481 {
7483 {
7489 {
7490 /* Assume this is a call protected by other code that
7491 detect the symbol is undefined. If this is the case,
7492 we can safely ignore the overflow. If not, the
7493 program is hosed anyway, and a little warning isn't
7494 going to help. */
7497 }
7501 sym_name,
7504 input_bfd,
7505 input_section,
7508 }
7509 else
7510 {
7516 }
7517 }
7518 }
7520 #ifdef DEBUG
7522 #endif
7525 }
7526 \f
7527 #define PPC_LO(v) ((v) & 0xffff)
7528 #define PPC_HI(v) (((v) >> 16) & 0xffff)
7529 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
7531 /* Finish up dynamic symbol handling. We set the contents of various
7532 dynamic sections here. */
7534 static bfd_boolean
7539 {
7542 bfd_boolean doneone;
7544 #ifdef DEBUG
7547 #endif
7555 {
7557 {
7558 Elf_Internal_Rela rela;
7560 bfd_vma reloc_index;
7564 else
7565 {
7571 }
7573 /* This symbol has an entry in the procedure linkage table.
7574 Set it up. */
7576 {
7577 bfd_vma got_offset;
7580 /* The first three entries in .got.plt are reserved. */
7583 /* Use the right PLT. */
7587 /* Fill in the .plt on VxWorks. */
7589 {
7596 }
7597 else
7598 {
7607 }
7614 /* This instruction is an immediate load. The value loaded is
7615 the byte offset of the R_PPC_JMP_SLOT relocation from the
7616 start of the .rela.plt section. The value is stored in the
7617 low-order 16 bits of the load instruction. */
7618 /* NOTE: It appears that this is now an index rather than a
7619 prescaled offset. */
7623 /* This instruction is a PC-relative branch whose target is
7624 the start of the PLT section. The address of this branch
7625 instruction is 20 bytes beyond the start of this PLT entry.
7626 The address is encoded in bits 6-29, inclusive. The value
7627 stored is right-shifted by two bits, permitting a 26-bit
7628 offset. */
7638 /* Fill in the GOT entry corresponding to this PLT slot with
7639 the address immediately after the the "bctr" instruction
7640 in this PLT entry. */
7647 {
7648 /* Fill in a couple of entries in .rela.plt.unloaded. */
7654 /* Provide the @ha relocation for the first instruction. */
7659 R_PPC_ADDR16_HA);
7664 /* Provide the @l relocation for the second instruction. */
7669 R_PPC_ADDR16_LO);
7674 /* Provide a relocation for the GOT entry corresponding to this
7675 PLT slot. Point it at the middle of the .plt entry. */
7680 R_PPC_ADDR32);
7683 }
7685 /* VxWorks uses non-standard semantics for R_PPC_JMP_SLOT.
7686 In particular, the offset for the relocation is not the
7687 address of the PLT entry for this function, as specified
7688 by the ABI. Instead, the offset is set to the address of
7689 the GOT slot for this function. See EABI 4.4.4.1. */
7694 }
7695 else
7696 {
7701 {
7702 /* We don't need to fill in the .plt. The ppc dynamic
7703 linker will fill it in. */
7704 }
7705 else
7706 {
7712 }
7713 }
7715 /* Fill in the entry in the .rela.plt section. */
7724 {
7725 /* Mark the symbol as undefined, rather than as
7726 defined in the .plt section. Leave the value if
7727 there were any relocations where pointer equality
7728 matters (this is a clue for the dynamic linker, to
7729 make function pointer comparisons work between an
7730 application and shared library), otherwise set it
7731 to zero. */
7736 {
7737 /* This breaks function pointer comparisons, but
7738 that is better than breaking tests for a NULL
7739 function pointer. */
7741 }
7742 }
7744 }
7747 {
7748 bfd_vma plt;
7757 {
7770 {
7779 }
7780 else
7781 {
7790 }
7791 }
7792 else
7793 {
7803 /* We only need one non-PIC glink stub. */
7805 }
7806 }
7807 else
7809 }
7812 {
7814 Elf_Internal_Rela rela;
7817 /* This symbols needs a copy reloc. Set it up. */
7819 #ifdef DEBUG
7821 #endif
7827 else
7836 }
7838 #ifdef DEBUG
7840 #endif
7842 /* Mark some specially defined symbols as absolute. */
7851 }
7852 \f
7853 static enum elf_reloc_type_class
7855 {
7857 {
7868 }
7869 }
7870 \f
7871 /* Finish up the dynamic sections. */
7873 static bfd_boolean
7876 {
7880 bfd_vma got;
7884 #ifdef DEBUG
7886 #endif
7893 else
7901 {
7909 {
7910 Elf_Internal_Dyn dyn;
7916 {
7920 else
7940 {
7944 }
7952 }
7955 }
7956 }
7959 {
7962 {
7967 {
7968 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4
7969 so that a function can easily find the address of
7970 _GLOBAL_OFFSET_TABLE_. */
7974 }
7977 {
7982 }
7983 }
7984 else
7985 {
7992 }
7995 }
7997 /* Fill in the first entry in the VxWorks procedure linkage table. */
7999 {
8000 /* Use the right PLT. */
8006 {
8013 }
8014 else
8015 {
8018 }
8027 {
8028 Elf_Internal_Rela rela;
8033 /* Output the @ha relocation for the first instruction. */
8042 /* Output the @l relocation for the second instruction. */
8051 /* Fix up the remaining relocations. They may have the wrong
8052 symbol index for _G_O_T_ or _P_L_T_ depending on the order
8053 in which symbols were output. */
8055 {
8056 Elf_Internal_Rela rel;
8072 }
8073 }
8074 }
8077 {
8080 bfd_vma res0;
8083 /*
8084 * PIC glink code is the following:
8085 *
8086 * # ith PLT code stub.
8087 * addis 11,30,(plt+(i-1)*4-got)@ha
8088 * lwz 11,(plt+(i-1)*4-got)@l(11)
8089 * mtctr 11
8090 * bctr
8091 *
8092 * # A table of branches, one for each plt entry.
8093 * # The idea is that the plt call stub loads ctr and r11 with these
8094 * # addresses, so (r11 - res_0) gives the plt index * 4.
8095 * res_0: b PLTresolve
8096 * res_1: b PLTresolve
8097 * .
8098 * # Some number of entries towards the end can be nops
8099 * res_n_m3: nop
8100 * res_n_m2: nop
8101 * res_n_m1:
8102 *
8103 * PLTresolve:
8104 * addis 11,11,(1f-res_0)@ha
8105 * mflr 0
8106 * bcl 20,31,1f
8107 * 1: addi 11,11,(1b-res_0)@l
8108 * mflr 12
8109 * mtlr 0
8110 * sub 11,11,12 # r11 = index * 4
8111 * addis 12,12,(got+4-1b)@ha
8112 * lwz 0,(got+4-1b)@l(12) # got[1] address of dl_runtime_resolve
8113 * lwz 12,(got+8-1b)@l(12) # got[2] contains the map address
8114 * mtctr 0
8115 * add 0,11,11
8116 * add 11,0,11 # r11 = index * 12 = reloc offset.
8117 * bctr
8118 */
8120 {
8121 ADDIS_11_11,
8122 MFLR_0,
8123 BCL_20_31,
8124 ADDI_11_11,
8125 MFLR_12,
8126 MTLR_0,
8127 SUB_11_11_12,
8128 ADDIS_12_12,
8129 LWZ_0_12,
8130 LWZ_12_12,
8131 MTCTR_0,
8132 ADD_0_11_11,
8133 ADD_11_0_11,
8134 BCTR,
8135 NOP,
8136 NOP
8137 };
8139 /*
8140 * Non-PIC glink code is a little simpler.
8141 *
8142 * # ith PLT code stub.
8143 * lis 11,(plt+(i-1)*4)@ha
8144 * lwz 11,(plt+(i-1)*4)@l(11)
8145 * mtctr 11
8146 * bctr
8147 *
8148 * The branch table is the same, then comes
8149 *
8150 * PLTresolve:
8151 * lis 12,(got+4)@ha
8152 * addis 11,11,(-res_0)@ha
8153 * lwz 0,(got+4)@l(12) # got[1] address of dl_runtime_resolve
8154 * addi 11,11,(-res_0)@l # r11 = index * 4
8155 * mtctr 0
8156 * add 0,11,11
8157 * lwz 12,(got+8)@l(12) # got[2] contains the map address
8158 * add 11,0,11 # r11 = index * 12 = reloc offset.
8159 * bctr
8160 */
8162 {
8163 LIS_12,
8164 ADDIS_11_11,
8165 LWZ_0_12,
8166 ADDI_11_11,
8167 MTCTR_0,
8168 ADD_0_11_11,
8169 LWZ_12_12,
8170 ADD_11_0_11,
8171 BCTR,
8172 NOP,
8173 NOP,
8174 NOP,
8175 NOP,
8176 NOP,
8177 NOP,
8178 NOP
8179 };
8186 /* Build the branch table, one for each plt entry (less one),
8187 and perhaps some padding. */
8193 {
8196 }
8198 {
8201 }
8207 /* Last comes the PLTresolve stub. */
8209 {
8210 bfd_vma bcl;
8213 {
8216 }
8230 {
8235 }
8236 else
8237 {
8242 }
8243 }
8244 else
8245 {
8247 {
8250 }
8260 {
8265 }
8266 else
8267 {
8272 }
8273 }
8274 }
8277 }
8278 \f
8279 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
8281 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
8283 #define ELF_ARCH bfd_arch_powerpc
8284 #define ELF_MACHINE_CODE EM_PPC
8285 #ifdef __QNXTARGET__
8286 #define ELF_MAXPAGESIZE 0x1000
8287 #else
8288 #define ELF_MAXPAGESIZE 0x10000
8289 #endif
8290 #define ELF_MINPAGESIZE 0x1000
8291 #define ELF_COMMONPAGESIZE 0x1000
8292 #define elf_info_to_howto ppc_elf_info_to_howto
8294 #ifdef EM_CYGNUS_POWERPC
8295 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
8296 #endif
8298 #ifdef EM_PPC_OLD
8299 #define ELF_MACHINE_ALT2 EM_PPC_OLD
8300 #endif
8302 #define elf_backend_plt_not_loaded 1
8303 #define elf_backend_can_gc_sections 1
8304 #define elf_backend_can_refcount 1
8305 #define elf_backend_rela_normal 1
8307 #define bfd_elf32_mkobject ppc_elf_mkobject
8308 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
8309 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
8310 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
8311 #define bfd_elf32_bfd_reloc_name_lookup ppc_elf_reloc_name_lookup
8312 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
8313 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create
8314 #define bfd_elf32_get_synthetic_symtab ppc_elf_get_synthetic_symtab
8316 #define elf_backend_object_p ppc_elf_object_p
8317 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
8318 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
8319 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
8320 #define elf_backend_relocate_section ppc_elf_relocate_section
8321 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
8322 #define elf_backend_check_relocs ppc_elf_check_relocs
8323 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol
8324 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
8325 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
8326 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
8327 #define elf_backend_hash_symbol ppc_elf_hash_symbol
8328 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
8329 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
8330 #define elf_backend_fake_sections ppc_elf_fake_sections
8331 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
8332 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
8333 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
8334 #define elf_backend_write_core_note ppc_elf_write_core_note
8335 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
8336 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing
8337 #define elf_backend_final_write_processing ppc_elf_final_write_processing
8338 #define elf_backend_write_section ppc_elf_write_section
8339 #define elf_backend_get_sec_type_attr ppc_elf_get_sec_type_attr
8340 #define elf_backend_plt_sym_val ppc_elf_plt_sym_val
8341 #define elf_backend_action_discarded ppc_elf_action_discarded
8342 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
8346 /* VxWorks Target */
8348 #undef TARGET_LITTLE_SYM
8349 #undef TARGET_LITTLE_NAME
8351 #undef TARGET_BIG_SYM
8352 #define TARGET_BIG_SYM bfd_elf32_powerpc_vxworks_vec
8353 #undef TARGET_BIG_NAME
8356 /* VxWorks uses the elf default section flags for .plt. */
8359 {
8367 }
8369 /* Like ppc_elf_link_hash_table_create, but overrides
8370 appropriately for VxWorks. */
8373 {
8378 {
8386 }
8388 }
8390 /* Tweak magic VxWorks symbols as they are loaded. */
8391 static bfd_boolean
8399 {
8401 valp))
8405 }
8407 static void
8409 {
8412 }
8414 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
8415 define it. */
8416 #undef elf_backend_want_plt_sym
8417 #define elf_backend_want_plt_sym 1
8418 #undef elf_backend_want_got_plt
8419 #define elf_backend_want_got_plt 1
8420 #undef elf_backend_got_symbol_offset
8421 #define elf_backend_got_symbol_offset 0
8422 #undef elf_backend_plt_not_loaded
8423 #define elf_backend_plt_not_loaded 0
8424 #undef elf_backend_plt_readonly
8425 #define elf_backend_plt_readonly 1
8426 #undef elf_backend_got_header_size
8427 #define elf_backend_got_header_size 12
8429 #undef bfd_elf32_get_synthetic_symtab
8431 #undef bfd_elf32_bfd_link_hash_table_create
8432 #define bfd_elf32_bfd_link_hash_table_create \
8433 ppc_elf_vxworks_link_hash_table_create
8434 #undef elf_backend_add_symbol_hook
8435 #define elf_backend_add_symbol_hook \
8436 ppc_elf_vxworks_add_symbol_hook
8437 #undef elf_backend_link_output_symbol_hook
8438 #define elf_backend_link_output_symbol_hook \
8439 elf_vxworks_link_output_symbol_hook
8440 #undef elf_backend_final_write_processing
8441 #define elf_backend_final_write_processing \
8442 ppc_elf_vxworks_final_write_processing
8443 #undef elf_backend_get_sec_type_attr
8444 #define elf_backend_get_sec_type_attr \
8445 ppc_elf_vxworks_get_sec_type_attr
8446 #undef elf_backend_emit_relocs
8447 #define elf_backend_emit_relocs \
8448 elf_vxworks_emit_relocs
8450 #undef elf32_bed
8451 #define elf32_bed ppc_elf_vxworks_bed