| blob | dcf33cc3daa8b58a3b80936bf6930c2b0e05d5fa |
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 to section mapping 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 }
2856 }
2858 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2859 to output sections (just like _bfd_elf_create_dynamic_sections has
2860 to create .dynbss and .rela.bss). */
2862 static bfd_boolean
2864 {
2867 flagword flags;
2895 {
2902 }
2915 /* The VxWorks PLT is a loaded section with contents. */
2918 }
2920 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2922 static void
2926 {
2933 {
2935 {
2939 /* Add reloc counts against the indirect sym to the direct sym
2940 list. Merge any entries against the same section. */
2942 {
2947 {
2952 }
2955 }
2957 }
2961 }
2966 /* If called to transfer flags for a weakdef during processing
2967 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
2968 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
2980 /* If we were called to copy over info for a weak sym, that's all. */
2984 /* Copy over the GOT refcount entries that we may have already seen to
2985 the symbol which just became indirect. */
2989 /* And plt entries. */
2991 {
2993 {
2998 {
3003 {
3007 }
3010 }
3012 }
3016 }
3019 {
3027 }
3028 }
3030 /* Hook called by the linker routine which adds symbols from an object
3031 file. We use it to put .comm items in .sbss, and not .bss. */
3033 static bfd_boolean
3041 {
3046 {
3047 /* Common symbols less than or equal to -G nn bytes are automatically
3048 put into .sbss. */
3053 {
3061 flags);
3064 }
3068 }
3071 }
3072 \f
3073 static bfd_boolean
3076 {
3085 }
3087 /* Create a special linker section. */
3089 static bfd_boolean
3092 flagword flags,
3094 {
3101 /* Record the first bfd that needs the special sections. */
3107 flags);
3114 }
3116 /* Find a linker generated pointer with a given addend and type. */
3119 elf_find_pointer_linker_section
3121 bfd_vma addend,
3123 {
3129 }
3131 /* Allocate a pointer to live in a linker created section. */
3133 static bfd_boolean
3138 {
3142 bfd_size_type amt;
3146 /* Is this a global symbol? */
3148 {
3151 /* Has this symbol already been allocated? If so, our work is done. */
3155 lsect))
3159 }
3160 else
3161 {
3164 /* Allocation of a pointer to a local symbol. */
3167 /* Allocate a table to hold the local symbols if first time. */
3169 {
3180 }
3182 /* Has this symbol already been allocated? If so, our work is done. */
3185 lsect))
3189 }
3191 /* Allocate space for a pointer in the linker section, and allocate
3192 a new pointer record from internal memory. */
3208 #ifdef DEBUG
3213 #endif
3216 }
3218 static bfd_boolean
3223 {
3228 {
3236 }
3242 }
3244 static bfd_boolean
3247 {
3256 {
3266 }
3269 }
3273 {
3282 }
3284 static void
3286 {
3289 abfd,
3292 }
3294 /* Look through the relocs for a section during the first phase, and
3295 allocate space in the global offset table or procedure linkage
3296 table. */
3298 static bfd_boolean
3303 {
3315 /* Don't do anything special with non-loaded, non-alloced sections.
3316 In particular, any relocs in such sections should not affect GOT
3317 and PLT reference counting (ie. we don't allow them to create GOT
3318 or PLT entries), there's no possibility or desire to optimize TLS
3319 relocs, and there's not much point in propagating relocs to shared
3320 libs that the dynamic linker won't relocate. */
3324 #ifdef DEBUG
3327 #endif
3331 /* Initialize howto table if not already done. */
3345 {
3354 else
3355 {
3360 }
3362 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
3363 This shows up in particular in an R_PPC_ADDR32 in the eabi
3364 startup code. */
3368 {
3374 }
3380 {
3397 /* We have a new-style __tls_get_addr call with a marker
3398 reloc. */
3399 ;
3400 else
3401 /* Mark this section as having an old-style call. */
3404 }
3407 {
3410 /* These special tls relocs tie a call to __tls_get_addr with
3411 its parameter symbol. */
3442 dogottls:
3444 /* Fall thru */
3446 /* GOT16 relocations */
3451 /* This symbol requires a global offset table entry. */
3453 {
3458 }
3460 {
3463 }
3464 else
3465 /* This is a global offset table entry for a local symbol. */
3470 /* Indirect .sdata relocation. */
3473 {
3476 }
3485 {
3488 }
3491 /* Indirect .sdata2 relocation. */
3494 {
3497 }
3506 {
3509 }
3514 {
3517 }
3522 {
3525 }
3530 {
3533 }
3538 {
3541 }
3547 {
3550 }
3558 {
3561 }
3570 {
3573 }
3584 #ifdef DEBUG
3586 #endif
3587 /* This symbol requires a procedure linkage table entry. We
3588 actually build the entry in finish_dynamic_symbol,
3589 because this might be a case of linking PIC code without
3590 linking in any dynamic objects, in which case we don't
3591 need to generate a procedure linkage table after all. */
3594 {
3595 /* It does not make sense to have a procedure linkage
3596 table entry for a local symbol. */
3599 abfd,
3600 sec,
3605 }
3606 else
3607 {
3611 {
3614 }
3618 }
3621 /* The following relocations don't need to propagate the
3622 relocation if linking a shared object since they are
3623 section relative. */
3642 /* These are just markers. */
3649 /* These should only appear in dynamic objects. */
3656 /* These aren't handled yet. We'll report an error later. */
3665 /* This refers only to functions defined in the shared library. */
3668 {
3671 }
3674 /* This relocation describes the C++ object vtable hierarchy.
3675 Reconstruct it for later use during GC. */
3681 /* This relocation describes which C++ vtable entries are actually
3682 used. Record for later use during GC. */
3690 /* We shouldn't really be seeing these. */
3700 /* Nor these. */
3711 {
3712 /* Old -fPIC gcc code has .long LCTOC1-LCFx just before
3713 the start of a function, which assembles to a REL32
3714 reference to .got2. If we detect one of these, then
3715 force the old PLT layout because the linker cannot
3716 reliably deduce the GOT pointer value needed for
3717 PLT call stubs. */
3721 r_symndx);
3723 {
3726 }
3727 }
3730 /* fall through */
3740 {
3741 /* We may need a plt entry if the symbol turns out to be
3742 a function defined in a dynamic object. */
3746 /* We may need a copy reloc too. */
3749 }
3759 {
3761 {
3764 }
3766 }
3767 /* fall through */
3774 {
3775 /* We may need a plt entry if the symbol turns out to be
3776 a function defined in a dynamic object. */
3780 }
3782 dodyn:
3783 /* If we are creating a shared library, and this is a reloc
3784 against a global symbol, or a non PC relative reloc
3785 against a local symbol, then we need to copy the reloc
3786 into the shared library. However, if we are linking with
3787 -Bsymbolic, we do not need to copy a reloc against a
3788 global symbol which is defined in an object we are
3789 including in the link (i.e., DEF_REGULAR is set). At
3790 this point we have not seen all the input files, so it is
3791 possible that DEF_REGULAR is not set now but will be set
3792 later (it is never cleared). In case of a weak definition,
3793 DEF_REGULAR may be cleared later by a strong definition in
3794 a shared library. We account for that possibility below by
3795 storing information in the dyn_relocs field of the hash
3796 table entry. A similar situation occurs when creating
3797 shared libraries and symbol visibility changes render the
3798 symbol local.
3800 If on the other hand, we are creating an executable, we
3801 may need to keep relocations for symbols satisfied by a
3802 dynamic library if we manage to avoid copy relocs for the
3803 symbol. */
3810 || (ELIMINATE_COPY_RELOCS
3815 {
3819 #ifdef DEBUG
3821 "ppc_elf_check_relocs needs to "
3825 #endif
3827 {
3831 sreloc = _bfd_elf_make_dynamic_reloc_section
3836 }
3838 /* If this is a global symbol, we count the number of
3839 relocations we need for this symbol. */
3841 {
3843 }
3844 else
3845 {
3846 /* Track dynamic relocs needed for local syms too.
3847 We really need local syms available to do this
3848 easily. Oh well. */
3860 }
3864 {
3873 }
3878 }
3881 }
3882 }
3885 }
3886 \f
3888 /* Merge object attributes from IBFD into OBFD. Raise an error if
3889 there are conflicting attributes. */
3890 static bfd_boolean
3892 {
3897 {
3898 /* This is the first object. Copy the attributes. */
3901 /* Use the Tag_null value to indicate the attributes have been
3902 initialized. */
3906 }
3911 /* Check for conflicting Tag_GNU_Power_ABI_FP attributes and merge
3912 non-conflicting ones. */
3916 {
3921 ;
3923 _bfd_error_handler
3926 _bfd_error_handler
3930 _bfd_error_handler
3934 _bfd_error_handler
3938 _bfd_error_handler
3941 _bfd_error_handler
3944 else
3945 _bfd_error_handler
3948 }
3950 /* Check for conflicting Tag_GNU_Power_ABI_Vector attributes and
3951 merge non-conflicting ones. */
3955 {
3959 {
3963 }
3966 {
3970 }
3976 ;
3977 /* For now, allow generic to transition to AltiVec or SPE
3978 without a warning. If GCC marked files with their stack
3979 alignment and used don't-care markings for files which are
3980 not affected by the vector ABI, we could warn about this
3981 case too. */
3985 ;
3987 _bfd_error_handler
3991 _bfd_error_handler
3994 else
3995 _bfd_error_handler
3998 }
4000 /* Check for conflicting Tag_GNU_Power_ABI_Struct_Return attributes
4001 and merge non-conflicting ones. */
4005 {
4010 ;
4012 _bfd_error_handler
4015 _bfd_error_handler
4018 _bfd_error_handler
4021 else
4022 _bfd_error_handler
4025 }
4027 /* Merge Tag_compatibility attributes and any common GNU ones. */
4031 }
4033 /* Merge backend specific data from an object file to the output
4034 object file when linking. */
4036 static bfd_boolean
4038 {
4039 flagword old_flags;
4040 flagword new_flags;
4041 bfd_boolean error;
4046 /* Check if we have the same endianess. */
4056 {
4057 /* First call, no flags set. */
4060 }
4062 /* Compatible flags are ok. */
4064 ;
4066 /* Incompatible flags. */
4067 else
4068 {
4069 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
4070 to be linked with either. */
4074 {
4079 }
4082 {
4087 }
4089 /* The output is -mrelocatable-lib iff both the input files are. */
4093 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
4094 but each input file is either -mrelocatable or -mrelocatable-lib. */
4100 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
4101 any module uses it. */
4107 /* Warn about any other mismatches. */
4109 {
4115 }
4118 {
4121 }
4122 }
4125 }
4126 \f
4127 /* Choose which PLT scheme to use, and set .plt flags appropriately.
4128 Returns -1 on error, 0 for old PLT, 1 for new PLT. */
4129 int
4134 {
4136 flagword flags;
4141 {
4144 else
4145 {
4149 /* Look through the reloc flags left by ppc_elf_check_relocs.
4150 Use the old style bss plt if a file makes plt calls
4151 without using the new relocs, and if ld isn't given
4152 --secure-plt and we never see REL16 relocs. */
4157 {
4161 {
4165 }
4166 }
4168 }
4169 }
4178 {
4182 /* The new PLT is a loaded section. */
4187 /* The new GOT is not executable. */
4191 }
4192 else
4193 {
4194 /* Stop an unused .glink section from affecting .text alignment. */
4198 }
4200 }
4201 \f
4202 /* Return the section that should be marked against GC for a given
4203 relocation. */
4211 {
4214 {
4218 }
4221 }
4223 /* Update the got, plt and dynamic reloc reference counts for the
4224 section being removed. */
4226 static bfd_boolean
4231 {
4255 {
4262 {
4274 {
4275 /* Everything must go for SEC. */
4278 }
4279 }
4283 {
4305 {
4308 }
4310 {
4313 }
4323 /* Fall thru */
4346 {
4351 }
4356 }
4357 }
4359 }
4360 \f
4361 /* Set plt output section type, htab->tls_get_addr, and call the
4362 generic ELF tls_setup function. */
4364 asection *
4366 {
4373 {
4376 }
4381 }
4383 /* Return TRUE iff REL is a branch reloc with a global symbol matching
4384 HASH. */
4386 static bfd_boolean
4390 {
4406 {
4416 }
4418 }
4420 /* Run through all the TLS relocs looking for optimization
4421 opportunities. */
4423 bfd_boolean
4426 {
4436 /* Make two passes through the relocs. First time check that tls
4437 relocs involved in setting up a tls_get_addr call are indeed
4438 followed by such a call. If they are not, exclude them from
4439 the optimizations done on the second pass. */
4442 {
4448 {
4451 /* Read the relocations. */
4459 {
4465 bfd_boolean is_local;
4471 {
4479 }
4489 {
4493 /* Fall thru */
4497 /* These relocs should never be against a symbol
4498 defined in a shared lib. Leave them alone if
4499 that turns out to be the case. */
4503 /* LD -> LE */
4511 /* Fall thru */
4516 /* GD -> LE */
4518 else
4519 /* GD -> IE */
4529 {
4530 /* IE -> LE */
4534 }
4535 else
4540 }
4543 {
4553 /* Uh oh, we didn't find the expected call. We
4554 could just mark this symbol to exclude it
4555 from tls optimization but it's safer to skip
4556 the entire section. */
4559 }
4562 {
4565 }
4566 else
4567 {
4573 {
4580 {
4584 }
4585 }
4593 }
4596 {
4597 /* We managed to get rid of a got entry. */
4600 }
4603 {
4609 }
4613 }
4617 }
4621 {
4624 else
4626 }
4627 }
4629 }
4630 \f
4631 /* Return true if we have dynamic relocs that apply to read-only sections. */
4633 static bfd_boolean
4635 {
4639 {
4646 }
4648 }
4650 /* Adjust a symbol defined by a dynamic object and referenced by a
4651 regular object. The current definition is in some section of the
4652 dynamic object, but we're not including those sections. We have to
4653 change the definition to something the rest of the link can
4654 understand. */
4656 static bfd_boolean
4659 {
4663 #ifdef DEBUG
4666 #endif
4668 /* Make sure we know what is going on here. */
4677 /* Deal with function syms. */
4680 {
4681 /* Clear procedure linkage table information for any symbol that
4682 won't need a .plt entry. */
4691 {
4692 /* A PLT entry is not required/allowed when:
4694 1. We are not using ld.so; because then the PLT entry
4695 can't be set up, so we can't use one. In this case,
4696 ppc_elf_adjust_dynamic_symbol won't even be called.
4698 2. GC has rendered the entry unused.
4700 3. We know for certain that a call to this symbol
4701 will go to this object, or will remain undefined. */
4704 }
4705 else
4706 {
4707 /* After adjust_dynamic_symbol, non_got_ref set means that
4708 dyn_relocs for this symbol should be discarded.
4709 If we get here we know we are making a PLT entry for this
4710 symbol, and in an executable we'd normally resolve
4711 relocations against this symbol to the PLT entry. Allow
4712 dynamic relocs if the reference is weak, and the dynamic
4713 relocs will not cause text relocation. */
4720 }
4722 }
4723 else
4726 /* If this is a weak symbol, and there is a real definition, the
4727 processor independent code will have arranged for us to see the
4728 real definition first, and we can just use the same value. */
4730 {
4738 }
4740 /* This is a reference to a symbol defined by a dynamic object which
4741 is not a function. */
4743 /* If we are creating a shared library, we must presume that the
4744 only references to the symbol are via the global offset table.
4745 For such cases we need not do anything here; the relocations will
4746 be handled correctly by relocate_section. */
4750 /* If there are no references to this symbol that do not use the
4751 GOT, we don't need to generate a copy reloc. */
4755 /* If we didn't find any dynamic relocs in read-only sections, then
4756 we'll be keeping the dynamic relocs and avoiding the copy reloc.
4757 We can't do this if there are any small data relocations. This
4758 doesn't work on VxWorks, where we can not have dynamic
4759 relocations (other than copy and jump slot relocations) in an
4760 executable. */
4766 {
4769 }
4772 {
4776 }
4778 /* We must allocate the symbol in our .dynbss section, which will
4779 become part of the .bss section of the executable. There will be
4780 an entry for this symbol in the .dynsym section. The dynamic
4781 object will contain position independent code, so all references
4782 from the dynamic object to this symbol will go through the global
4783 offset table. The dynamic linker will use the .dynsym entry to
4784 determine the address it must put in the global offset table, so
4785 both the dynamic object and the regular object will refer to the
4786 same memory location for the variable.
4788 Of course, if the symbol is referenced using SDAREL relocs, we
4789 must instead allocate it in .sbss. */
4793 else
4797 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
4798 copy the initial value out of the dynamic object and into the
4799 runtime process image. We need to remember the offset into the
4800 .rela.bss section we are going to use. */
4802 {
4807 else
4812 }
4815 }
4816 \f
4817 /* Generate a symbol to mark plt call stubs. For non-PIC code the sym is
4818 xxxxxxxx.plt_call32.<callee> where xxxxxxxx is a hex number, usually 0,
4819 specifying the addend on the plt relocation. For -fpic code, the sym
4820 is xxxxxxxx.plt_pic32.<callee>, and for -fPIC
4821 xxxxxxxx.got2.plt_pic32.<callee>. */
4823 static bfd_boolean
4827 {
4836 else
4856 {
4865 }
4867 }
4869 /* Allocate NEED contiguous space in .got, and return the offset.
4870 Handles allocation of the got header when crossing 32k. */
4872 static bfd_vma
4874 {
4875 bfd_vma where;
4879 {
4882 }
4883 else
4884 {
4887 {
4890 }
4891 else
4892 {
4895 {
4898 }
4901 }
4902 }
4904 }
4906 /* Allocate space in associated reloc sections for dynamic relocs. */
4908 static bfd_boolean
4910 {
4920 /* When warning symbols are created, they **replace** the "real"
4921 entry in the hash table, thus we never get to see the real
4922 symbol in a hash traversal. So look at it now. */
4927 {
4934 {
4935 /* Make sure this symbol is output as a dynamic symbol. */
4938 {
4941 }
4945 {
4949 {
4951 {
4954 }
4959 {
4962 }
4967 {
4970 }
4976 }
4977 else
4978 {
4980 {
4981 /* If this is the first .plt entry, make room
4982 for the special first entry. */
4986 /* The PowerPC PLT is actually composed of two
4987 parts, the first part is 2 words (for a load
4988 and a jump), and then there is a remaining
4989 word available at the end. */
4996 /* If this symbol is not defined in a regular
4997 file, and we are not generating a shared
4998 library, then set the symbol to this location
4999 in the .plt. This is required to make
5000 function pointers compare as equal between
5001 the normal executable and the shared library. */
5005 {
5008 }
5010 /* Make room for this entry. */
5012 /* After the 8192nd entry, room for two entries
5013 is allocated. */
5019 }
5021 }
5023 /* We also need to make an entry in the .rela.plt section. */
5025 {
5029 {
5030 /* Allocate space for the unloaded relocations. */
5032 {
5035 {
5039 }
5044 }
5046 /* Every PLT entry has an associated GOT entry in
5047 .got.plt. */
5049 }
5051 }
5052 }
5053 else
5055 }
5056 else
5060 {
5063 }
5064 }
5065 else
5066 {
5069 }
5073 {
5074 bfd_boolean dyn;
5077 /* Make sure this symbol is output as a dynamic symbol. */
5081 {
5084 }
5088 {
5090 {
5092 /* We'll just use htab->tlsld_got.offset. This should
5093 always be the case. It's a little odd if we have
5094 a local dynamic reloc against a non-local symbol. */
5096 else
5098 }
5105 }
5106 else
5110 else
5111 {
5118 {
5119 /* All the entries we allocated need relocs.
5120 Except LD only needs one. */
5125 }
5126 }
5127 }
5128 else
5135 /* In the shared -Bsymbolic case, discard space allocated for
5136 dynamic pc-relative relocs against symbols which turn out to be
5137 defined in regular objects. For the normal shared case, discard
5138 space for relocs that have become local due to symbol visibility
5139 changes. */
5142 {
5143 /* Relocs that use pc_count are those that appear on a call insn,
5144 or certain REL relocs (see must_be_dyn_reloc) that can be
5145 generated via assembly. We want calls to protected symbols to
5146 resolve directly to the function rather than going via the plt.
5147 If people want function pointer comparisons to work as expected
5148 then they should avoid writing weird assembly. */
5150 {
5154 {
5159 else
5161 }
5162 }
5165 {
5169 {
5172 else
5174 }
5175 }
5177 /* Discard relocs on undefined symbols that must be local. */
5184 /* Also discard relocs on undefined weak syms with non-default
5185 visibility. */
5188 {
5192 /* Make sure undefined weak symbols are output as a dynamic
5193 symbol in PIEs. */
5196 {
5199 }
5200 }
5201 }
5203 {
5204 /* For the non-shared case, discard space for relocs against
5205 symbols which turn out to need copy relocs or are not
5206 dynamic. */
5210 {
5211 /* Make sure this symbol is output as a dynamic symbol.
5212 Undefined weak syms won't yet be marked as dynamic. */
5215 {
5218 }
5220 /* If that succeeded, we know we'll be keeping all the
5221 relocs. */
5224 }
5228 keep: ;
5229 }
5231 /* Finally, allocate space. */
5233 {
5236 }
5239 }
5241 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
5242 read-only sections. */
5244 static bfd_boolean
5246 {
5254 {
5257 /* Not an error, just cut short the traversal. */
5259 }
5261 }
5263 /* Set the sizes of the dynamic sections. */
5265 static bfd_boolean
5268 {
5271 bfd_boolean relocs;
5274 #ifdef DEBUG
5276 #endif
5282 {
5283 /* Set the contents of the .interp section to the interpreter. */
5285 {
5290 }
5291 }
5298 /* Set up .got offsets for local syms, and space for local dynamic
5299 relocs. */
5301 {
5305 bfd_size_type locsymcount;
5312 {
5319 {
5322 {
5323 /* Input section has been discarded, either because
5324 it is a copy of a linkonce section or due to
5325 linker script /DISCARD/, so we'll be discarding
5326 the relocs too. */
5327 }
5331 {
5332 /* Relocations in vxworks .tls_vars sections are
5333 handled specially by the loader. */
5334 }
5336 {
5343 }
5344 }
5345 }
5357 {
5360 {
5369 }
5370 else
5374 else
5375 {
5380 }
5381 }
5382 else
5384 }
5386 /* Allocate space for global sym dynamic relocs. */
5390 {
5394 }
5395 else
5399 {
5402 /* If we haven't allocated the header, do so now. When we get here,
5403 for old plt/got the got size will be 0 to 32764 (not allocated),
5404 or 32780 to 65536 (header allocated). For new plt/got, the
5405 corresponding ranges are 0 to 32768 and 32780 to 65536. */
5407 {
5412 }
5415 }
5418 {
5420 /* Space for the branch table. */
5422 /* Pad out to align the start of PLTresolve. */
5427 {
5434 {
5443 }
5449 {
5458 }
5459 }
5460 }
5462 /* We've now determined the sizes of the various dynamic sections.
5463 Allocate memory for them. */
5466 {
5479 {
5480 /* We'd like to strip these sections if they aren't needed, but if
5481 we've exported dynamic symbols from them we must leave them.
5482 It's too late to tell BFD to get rid of the symbols. */
5485 /* Strip this section if we don't need it; see the
5486 comment below. */
5487 }
5490 {
5491 /* Strip these too. */
5492 }
5494 {
5496 {
5497 /* Remember whether there are any relocation sections. */
5500 /* We use the reloc_count field as a counter if we need
5501 to copy relocs into the output file. */
5503 }
5504 }
5505 else
5506 {
5507 /* It's not one of our sections, so don't allocate space. */
5509 }
5512 {
5513 /* If we don't need this section, strip it from the
5514 output file. This is mostly to handle .rela.bss and
5515 .rela.plt. We must create both sections in
5516 create_dynamic_sections, because they must be created
5517 before the linker maps input sections to output
5518 sections. The linker does that before
5519 adjust_dynamic_symbol is called, and it is that
5520 function which decides whether anything needs to go
5521 into these sections. */
5524 }
5529 /* Allocate memory for the section contents. */
5533 }
5536 {
5537 /* Add some entries to the .dynamic section. We fill in the
5538 values later, in ppc_elf_finish_dynamic_sections, but we
5539 must add the entries now so that we get the correct size for
5540 the .dynamic section. The DT_DEBUG entry is filled in by the
5541 dynamic linker and used by the debugger. */
5542 #define add_dynamic_entry(TAG, VAL) \
5543 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
5546 {
5549 }
5552 {
5558 }
5561 {
5564 }
5567 {
5572 }
5574 /* If any dynamic relocs apply to a read-only section, then we
5575 need a DT_TEXTREL entry. */
5578 info);
5581 {
5584 }
5588 }
5589 #undef add_dynamic_entry
5592 }
5594 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5596 static bfd_boolean
5598 {
5606 }
5607 \f
5608 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
5611 {
5620 };
5623 {
5628 };
5630 static bfd_boolean
5635 {
5636 struct one_fixup
5637 {
5640 bfd_vma toff;
5641 bfd_vma trampoff;
5642 };
5652 bfd_size_type trampoff;
5657 /* Nothing to do if there are no relocations, and no need to do
5658 anything with non-alloc sections. */
5664 /* We cannot represent the required PIC relocs in the output, so don't
5665 do anything. The linker doesn't support mixing -shared and -r
5666 anyway. */
5671 /* Space for a branch around any trampolines. */
5676 /* Get a copy of the native relocations. */
5687 {
5699 {
5714 }
5716 /* Get the value of the symbol referred to by the reloc. */
5718 {
5719 /* A local symbol. */
5722 /* Read this BFD's local symbols. */
5724 {
5732 }
5740 else
5745 }
5746 else
5747 {
5748 /* Global symbol handling. */
5763 {
5767 {
5769 {
5772 }
5773 else
5774 {
5777 }
5778 }
5779 }
5781 ;
5784 {
5787 }
5790 {
5793 }
5794 else
5798 }
5800 /* If the branch and target are in the same section, you have
5801 no hope of adding stubs. We'll error out later should the
5802 branch overflow. */
5806 /* There probably isn't any reason to handle symbols in
5807 SEC_MERGE sections; SEC_MERGE doesn't seem a likely
5808 attribute for a code section, and we are only looking at
5809 branches. However, implement it correctly here as a
5810 reference for other target relax_section functions. */
5812 {
5813 /* At this stage in linking, no SEC_MERGE symbol has been
5814 adjusted, so all references to such symbols need to be
5815 passed through _bfd_merged_section_offset. (Later, in
5816 relocate_section, all SEC_MERGE symbols *except* for
5817 section symbols have been adjusted.)
5819 gas may reduce relocations against symbols in SEC_MERGE
5820 sections to a relocation against the section symbol when
5821 the original addend was zero. When the reloc is against
5822 a section symbol we should include the addend in the
5823 offset passed to _bfd_merged_section_offset, since the
5824 location of interest is the original symbol. On the
5825 other hand, an access to "sym+addend" where "sym" is not
5826 a section symbol should not include the addend; Such an
5827 access is presumed to be an offset from "sym"; The
5828 location of interest is just "sym". */
5834 toff);
5838 }
5839 /* PLTREL24 addends are special. */
5843 /* Attempted -shared link of non-pic code loses. */
5852 /* If the branch is in range, no need to do anything. */
5855 /* A relocatable link may have sections moved during
5856 final link, so do not presume they remain in range. */
5861 /* Look for an existing fixup to this address. */
5867 {
5873 /* Oh dear, we can't reach a trampoline. Don't try to add
5874 one. We'll report an error later. */
5878 {
5882 }
5883 else
5884 {
5888 }
5897 /* Hijack the old relocation. Since we need two
5898 relocations for this use a "composite" reloc. */
5900 stub_rtype);
5905 /* Record the fixup so we don't do it again this section. */
5914 changes++;
5915 }
5916 else
5917 {
5922 /* Nop out the reloc, since we're finalizing things here. */
5924 }
5926 /* Get the section contents. */
5928 {
5929 /* Get cached copy if it exists. */
5932 else
5933 {
5934 /* Go get them off disk. */
5937 }
5938 }
5940 /* Fix up the existing branch to hit the trampoline. */
5943 {
5961 }
5962 }
5964 /* Write out the trampolines. */
5966 {
5969 bfd_vma val;
5972 do
5973 {
5977 }
5985 /* Branch around the trampolines. */
5993 {
5996 }
5997 else
5998 {
6001 }
6005 {
6007 i++;
6011 }
6013 }
6017 {
6020 else
6021 {
6022 /* Cache the symbols for elf_link_input_bfd. */
6024 }
6025 }
6029 {
6032 else
6033 {
6034 /* Cache the section contents for elf_link_input_bfd. */
6036 }
6037 }
6040 {
6041 /* Append sufficient NOP relocs so we can write out relocation
6042 information for the trampolines. */
6052 {
6056 }
6063 }
6069 {
6070 /* Convert the internal relax relocs to external form. */
6073 {
6076 /* Rewrite the reloc and convert one of the trailing nop
6077 relocs to describe this relocation. */
6079 /* The relocs are at the bottom 2 bytes */
6085 irel++;
6086 }
6087 }
6091 error_return:
6101 }
6102 \f
6103 /* What to do when ld finds relocations against symbols defined in
6104 discarded sections. */
6106 static unsigned int
6108 {
6116 }
6117 \f
6118 /* Fill in the address for a pointer generated in a linker section. */
6120 static bfd_vma
6124 bfd_vma relocation,
6126 {
6132 {
6133 /* Handle global symbol. */
6139 }
6140 else
6141 {
6142 /* Handle local symbol. */
6148 }
6152 lsect);
6155 /* Offset will always be a multiple of four, so use the bottom bit
6156 as a "written" flag. */
6158 {
6163 }
6169 #ifdef DEBUG
6173 #endif
6175 /* Subtract out the addend, because it will get added back in by the normal
6176 processing. */
6178 }
6180 /* The RELOCATE_SECTION function is called by the ELF backend linker
6181 to handle the relocations for a section.
6183 The relocs are always passed as Rela structures; if the section
6184 actually uses Rel structures, the r_addend field will always be
6185 zero.
6187 This function is responsible for adjust the section contents as
6188 necessary, and (if using Rela relocs and generating a
6189 relocatable output file) adjusting the reloc addend as
6190 necessary.
6192 This function does not have to worry about setting the reloc
6193 address or the reloc symbol index.
6195 LOCAL_SYMS is a pointer to the swapped in local symbols.
6197 LOCAL_SECTIONS is an array giving the section in the input file
6198 corresponding to the st_shndx field of each local symbol.
6200 The global hash table entry for the global symbols can be found
6201 via elf_sym_hashes (input_bfd).
6203 When generating relocatable output, this function must handle
6204 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
6205 going to be the section symbol corresponding to the output
6206 section, which means that the addend must be adjusted
6207 accordingly. */
6209 static bfd_boolean
6218 {
6224 Elf_Internal_Rela outrel;
6230 bfd_boolean is_vxworks_tls;
6232 #ifdef DEBUG
6238 #endif
6242 /* Initialize howto table if not already done. */
6250 /* We have to handle relocations in vxworks .tls_vars sections
6251 specially, because the dynamic loader is 'weird'. */
6258 {
6260 bfd_vma addend;
6261 bfd_reloc_status_type r;
6268 bfd_vma relocation;
6270 bfd_boolean unresolved_reloc;
6271 bfd_boolean warned;
6283 {
6289 }
6290 else
6291 {
6298 }
6301 {
6302 /* For relocs against symbols from removed linkonce sections,
6303 or sections discarded by a linker script, we just want the
6304 section contents zeroed. Avoid any special processing. */
6312 }
6315 {
6319 {
6320 /* R_PPC_PLTREL24 is rather special. If non-zero, the
6321 addend specifies the GOT pointer offset within .got2. */
6323 }
6325 }
6327 /* TLS optimizations. Replace instruction sequences and relocs
6328 based on information we collected in tls_optimize. We edit
6329 RELOCS so that --emit-relocs will output something sensible
6330 for the final instruction stream. */
6336 {
6340 }
6342 /* Ensure reloc mapping code below stays sane. */
6353 {
6361 {
6362 bfd_vma insn;
6369 }
6375 {
6384 else
6387 /* add -> addi. */
6393 /* load and store indexed -> dform. */
6397 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
6402 /* lwax -> lwa. */
6404 else
6411 /* Was PPC_TLS which sits on insn boundary, now
6412 PPC_TPREL16_LO which is at low-order half-word. */
6414 }
6427 {
6428 tls_gdld_hi:
6432 else
6433 {
6437 }
6439 }
6452 {
6454 bfd_vma offset;
6456 tls_ldgd_opt:
6458 /* If not using the newer R_PPC_TLSGD/LD to mark
6459 __tls_get_addr calls, we must trust that the call
6460 stays with its arg setup insns, ie. that the next
6461 reloc is the __tls_get_addr call associated with
6462 the current reloc. Edit both insns. */
6469 {
6470 /* IE */
6476 {
6479 R_PPC_NONE);
6482 }
6486 }
6487 else
6488 {
6489 /* LE */
6492 {
6493 /* Was an LD reloc. */
6496 r_symndx++)
6506 }
6510 {
6516 }
6517 }
6521 {
6522 /* We changed the symbol on an LD reloc. Start over
6523 in order to get h, sym, sec etc. right. */
6524 rel--;
6526 }
6527 }
6532 {
6537 {
6538 /* IE */
6541 }
6542 else
6543 {
6544 /* LE */
6548 }
6551 /* Zap the reloc on the _tls_get_addr call too. */
6554 R_PPC_NONE);
6555 }
6560 {
6565 r_symndx++)
6581 /* Zap the reloc on the _tls_get_addr call too. */
6584 R_PPC_NONE);
6585 rel--;
6587 }
6589 }
6591 /* Handle other relocations that tweak non-addend part of insn. */
6594 {
6598 /* Branch taken prediction relocations. */
6602 /* Fall thru */
6604 /* Branch not taken prediction relocations. */
6615 /* Invert 'y' bit if not the default. */
6621 }
6629 {
6648 /* GOT16 relocations. Like an ADDR16 using the symbol's
6649 address in the GOT as relocation value instead of the
6650 symbol's value itself. Also, create a GOT entry for the
6651 symbol and put the symbol value there. */
6685 dogot:
6686 {
6687 /* Relocation is to the entry for this symbol in the global
6688 offset table. */
6689 bfd_vma off;
6702 {
6703 bfd_boolean dyn;
6708 /* This is actually a static link, or it is a
6709 -Bsymbolic link and the symbol is defined
6710 locally, or the symbol was forced to be local
6711 because of a version file. */
6712 ;
6713 else
6714 {
6717 }
6719 }
6720 else
6721 {
6725 }
6727 /* The offset must always be a multiple of 4. We use the
6728 least significant bit to record whether we have already
6729 processed this entry. */
6733 else
6734 {
6745 /* We might have multiple got entries for this sym.
6746 Initialize them all. */
6747 do
6748 {
6752 {
6755 }
6757 {
6760 }
6762 {
6765 }
6767 {
6770 }
6772 /* Generate relocs for the dynamic linker. */
6778 {
6784 {
6787 {
6794 outrel.r_info
6796 }
6797 }
6804 else
6807 {
6811 }
6816 }
6818 /* Init the .got section contents if we're not
6819 emitting a reloc. */
6820 else
6821 {
6827 {
6833 {
6837 }
6838 }
6841 }
6846 }
6851 }
6857 {
6859 {
6865 {
6869 {
6872 }
6873 }
6874 }
6875 }
6879 + off
6882 /* Addends on got relocations don't make much sense.
6883 x+off@got is actually x@got+off, and since the got is
6884 generated by a hash table traversal, the value in the
6885 got at entry m+n bears little relation to the entry m. */
6889 input_bfd,
6890 input_section,
6893 sym_name);
6894 }
6897 /* Relocations that need no special processing. */
6899 /* It makes no sense to point a local relocation
6900 at a symbol not in this object. */
6902 {
6905 input_bfd,
6906 input_section,
6908 TRUE))
6911 }
6921 /* Relocations that may need to be propagated if this is a shared
6922 object. */
6928 /* The TPREL16 relocs shouldn't really be used in shared
6929 libs as they will result in DT_TEXTREL being set, but
6930 support them anyway. */
6955 /* fall through */
6970 /* If these relocations are not to a named symbol, they can be
6971 handled right here, no need to bother the dynamic linker. */
6975 /* fall through */
6983 /* fall through */
6985 dodyn:
6999 || (ELIMINATE_COPY_RELOCS
7005 {
7008 #ifdef DEBUG
7013 #endif
7015 /* When generating a shared object, these relocations
7016 are copied into the output file to be resolved at run
7017 time. */
7019 {
7020 sreloc = _bfd_elf_get_dynamic_reloc_section
7024 }
7042 {
7046 }
7047 else
7048 {
7053 else
7054 {
7058 ;
7060 {
7063 }
7064 else
7065 {
7068 /* We are turning this relocation into one
7069 against a section symbol. It would be
7070 proper to subtract the symbol's value,
7071 osec->vma, from the emitted reloc addend,
7072 but ld.so expects buggy relocs. */
7076 {
7079 }
7081 #ifdef DEBUG
7086 #endif
7087 }
7090 }
7091 }
7100 /* This reloc will be computed at runtime. We clear the memory
7101 so that it contains predictable value. */
7105 {
7109 }
7110 }
7115 {
7122 else
7126 }
7129 /* Fall thru */
7135 /* Fall thru */
7138 relax32:
7139 {
7146 /* We're clearing the bits for R_PPC_ADDR16_HA
7147 and R_PPC_ADDR16_LO here. */
7151 /* t0 is HA, t1 is LO */
7159 /* Rewrite the reloc and convert one of the trailing nop
7160 relocs to describe this relocation. */
7162 /* The relocs are at the bottom 2 bytes */
7168 rel++;
7169 }
7172 /* Indirect .sdata relocation. */
7175 relocation
7180 /* Indirect .sdata2 relocation. */
7183 relocation
7188 /* Handle the TOC16 reloc. We want to use the offset within the .got
7189 section, not the actual VMA. This is appropriate when generating
7190 an embedded ELF object, for which the .got section acts like the
7191 AIX .toc section. */
7194 {
7197 }
7205 /* Relocation is to the entry for this symbol in the
7206 procedure linkage table. */
7207 {
7213 {
7214 /* We didn't make a PLT entry for this symbol. This
7215 happens when statically linking PIC code, or when
7216 using -Bsymbolic. */
7218 }
7225 else
7229 }
7232 /* Relocate against _SDA_BASE_. */
7234 {
7238 {
7241 }
7248 {
7252 input_bfd,
7253 sym_name,
7255 name);
7256 }
7258 }
7261 /* Relocate against _SDA2_BASE_. */
7263 {
7267 {
7270 }
7275 {
7279 input_bfd,
7280 sym_name,
7282 name);
7287 }
7289 }
7292 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
7295 {
7300 {
7303 }
7310 {
7313 }
7316 {
7319 }
7322 {
7324 }
7325 else
7326 {
7330 input_bfd,
7331 sym_name,
7333 name);
7338 }
7345 }
7346 }
7349 /* Relocate against the beginning of the section. */
7355 {
7358 }
7362 /* Negative relocations. */
7388 input_bfd,
7390 sym_name);
7395 }
7397 /* Do any further special processing. */
7399 {
7410 /* It's just possible that this symbol is a weak symbol
7411 that's not actually defined anywhere. In that case,
7412 'sec' would be NULL, and we should leave the symbol
7413 alone (it will be set to zero elsewhere in the link). */
7416 /* Fall thru */
7424 /* Add 0x10000 if sign bit in 0:15 is set.
7425 Bits 0:15 are not used. */
7428 }
7430 #ifdef DEBUG
7435 sym_name,
7436 r_symndx,
7439 #endif
7444 {
7447 input_bfd,
7448 input_section,
7451 sym_name);
7453 }
7456 input_bfd,
7457 input_section,
7458 contents,
7460 relocation,
7461 addend);
7464 {
7466 {
7472 {
7473 /* Assume this is a call protected by other code that
7474 detect the symbol is undefined. If this is the case,
7475 we can safely ignore the overflow. If not, the
7476 program is hosed anyway, and a little warning isn't
7477 going to help. */
7480 }
7484 sym_name,
7487 input_bfd,
7488 input_section,
7491 }
7492 else
7493 {
7499 }
7500 }
7501 }
7503 #ifdef DEBUG
7505 #endif
7508 }
7509 \f
7510 #define PPC_LO(v) ((v) & 0xffff)
7511 #define PPC_HI(v) (((v) >> 16) & 0xffff)
7512 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
7514 /* Finish up dynamic symbol handling. We set the contents of various
7515 dynamic sections here. */
7517 static bfd_boolean
7522 {
7525 bfd_boolean doneone;
7527 #ifdef DEBUG
7530 #endif
7538 {
7540 {
7541 Elf_Internal_Rela rela;
7543 bfd_vma reloc_index;
7547 else
7548 {
7554 }
7556 /* This symbol has an entry in the procedure linkage table.
7557 Set it up. */
7559 {
7560 bfd_vma got_offset;
7563 /* The first three entries in .got.plt are reserved. */
7566 /* Use the right PLT. */
7570 /* Fill in the .plt on VxWorks. */
7572 {
7579 }
7580 else
7581 {
7590 }
7597 /* This instruction is an immediate load. The value loaded is
7598 the byte offset of the R_PPC_JMP_SLOT relocation from the
7599 start of the .rela.plt section. The value is stored in the
7600 low-order 16 bits of the load instruction. */
7601 /* NOTE: It appears that this is now an index rather than a
7602 prescaled offset. */
7606 /* This instruction is a PC-relative branch whose target is
7607 the start of the PLT section. The address of this branch
7608 instruction is 20 bytes beyond the start of this PLT entry.
7609 The address is encoded in bits 6-29, inclusive. The value
7610 stored is right-shifted by two bits, permitting a 26-bit
7611 offset. */
7621 /* Fill in the GOT entry corresponding to this PLT slot with
7622 the address immediately after the the "bctr" instruction
7623 in this PLT entry. */
7630 {
7631 /* Fill in a couple of entries in .rela.plt.unloaded. */
7637 /* Provide the @ha relocation for the first instruction. */
7642 R_PPC_ADDR16_HA);
7647 /* Provide the @l relocation for the second instruction. */
7652 R_PPC_ADDR16_LO);
7657 /* Provide a relocation for the GOT entry corresponding to this
7658 PLT slot. Point it at the middle of the .plt entry. */
7663 R_PPC_ADDR32);
7666 }
7668 /* VxWorks uses non-standard semantics for R_PPC_JMP_SLOT.
7669 In particular, the offset for the relocation is not the
7670 address of the PLT entry for this function, as specified
7671 by the ABI. Instead, the offset is set to the address of
7672 the GOT slot for this function. See EABI 4.4.4.1. */
7677 }
7678 else
7679 {
7684 {
7685 /* We don't need to fill in the .plt. The ppc dynamic
7686 linker will fill it in. */
7687 }
7688 else
7689 {
7695 }
7696 }
7698 /* Fill in the entry in the .rela.plt section. */
7707 {
7708 /* Mark the symbol as undefined, rather than as
7709 defined in the .plt section. Leave the value if
7710 there were any relocations where pointer equality
7711 matters (this is a clue for the dynamic linker, to
7712 make function pointer comparisons work between an
7713 application and shared library), otherwise set it
7714 to zero. */
7719 {
7720 /* This breaks function pointer comparisons, but
7721 that is better than breaking tests for a NULL
7722 function pointer. */
7724 }
7725 }
7727 }
7730 {
7731 bfd_vma plt;
7740 {
7753 {
7762 }
7763 else
7764 {
7773 }
7774 }
7775 else
7776 {
7786 /* We only need one non-PIC glink stub. */
7788 }
7789 }
7790 else
7792 }
7795 {
7797 Elf_Internal_Rela rela;
7800 /* This symbols needs a copy reloc. Set it up. */
7802 #ifdef DEBUG
7804 #endif
7810 else
7819 }
7821 #ifdef DEBUG
7823 #endif
7825 /* Mark some specially defined symbols as absolute. */
7834 }
7835 \f
7836 static enum elf_reloc_type_class
7838 {
7840 {
7851 }
7852 }
7853 \f
7854 /* Finish up the dynamic sections. */
7856 static bfd_boolean
7859 {
7863 bfd_vma got;
7867 #ifdef DEBUG
7869 #endif
7876 else
7884 {
7892 {
7893 Elf_Internal_Dyn dyn;
7899 {
7903 else
7923 {
7927 }
7935 }
7938 }
7939 }
7942 {
7945 {
7950 {
7951 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4
7952 so that a function can easily find the address of
7953 _GLOBAL_OFFSET_TABLE_. */
7957 }
7960 {
7965 }
7966 }
7967 else
7968 {
7975 }
7978 }
7980 /* Fill in the first entry in the VxWorks procedure linkage table. */
7982 {
7983 /* Use the right PLT. */
7989 {
7996 }
7997 else
7998 {
8001 }
8010 {
8011 Elf_Internal_Rela rela;
8016 /* Output the @ha relocation for the first instruction. */
8025 /* Output the @l relocation for the second instruction. */
8034 /* Fix up the remaining relocations. They may have the wrong
8035 symbol index for _G_O_T_ or _P_L_T_ depending on the order
8036 in which symbols were output. */
8038 {
8039 Elf_Internal_Rela rel;
8055 }
8056 }
8057 }
8060 {
8063 bfd_vma res0;
8066 /*
8067 * PIC glink code is the following:
8068 *
8069 * # ith PLT code stub.
8070 * addis 11,30,(plt+(i-1)*4-got)@ha
8071 * lwz 11,(plt+(i-1)*4-got)@l(11)
8072 * mtctr 11
8073 * bctr
8074 *
8075 * # A table of branches, one for each plt entry.
8076 * # The idea is that the plt call stub loads ctr and r11 with these
8077 * # addresses, so (r11 - res_0) gives the plt index * 4.
8078 * res_0: b PLTresolve
8079 * res_1: b PLTresolve
8080 * .
8081 * # Some number of entries towards the end can be nops
8082 * res_n_m3: nop
8083 * res_n_m2: nop
8084 * res_n_m1:
8085 *
8086 * PLTresolve:
8087 * addis 11,11,(1f-res_0)@ha
8088 * mflr 0
8089 * bcl 20,31,1f
8090 * 1: addi 11,11,(1b-res_0)@l
8091 * mflr 12
8092 * mtlr 0
8093 * sub 11,11,12 # r11 = index * 4
8094 * addis 12,12,(got+4-1b)@ha
8095 * lwz 0,(got+4-1b)@l(12) # got[1] address of dl_runtime_resolve
8096 * lwz 12,(got+8-1b)@l(12) # got[2] contains the map address
8097 * mtctr 0
8098 * add 0,11,11
8099 * add 11,0,11 # r11 = index * 12 = reloc offset.
8100 * bctr
8101 */
8103 {
8104 ADDIS_11_11,
8105 MFLR_0,
8106 BCL_20_31,
8107 ADDI_11_11,
8108 MFLR_12,
8109 MTLR_0,
8110 SUB_11_11_12,
8111 ADDIS_12_12,
8112 LWZ_0_12,
8113 LWZ_12_12,
8114 MTCTR_0,
8115 ADD_0_11_11,
8116 ADD_11_0_11,
8117 BCTR,
8118 NOP,
8119 NOP
8120 };
8122 /*
8123 * Non-PIC glink code is a little simpler.
8124 *
8125 * # ith PLT code stub.
8126 * lis 11,(plt+(i-1)*4)@ha
8127 * lwz 11,(plt+(i-1)*4)@l(11)
8128 * mtctr 11
8129 * bctr
8130 *
8131 * The branch table is the same, then comes
8132 *
8133 * PLTresolve:
8134 * lis 12,(got+4)@ha
8135 * addis 11,11,(-res_0)@ha
8136 * lwz 0,(got+4)@l(12) # got[1] address of dl_runtime_resolve
8137 * addi 11,11,(-res_0)@l # r11 = index * 4
8138 * mtctr 0
8139 * add 0,11,11
8140 * lwz 12,(got+8)@l(12) # got[2] contains the map address
8141 * add 11,0,11 # r11 = index * 12 = reloc offset.
8142 * bctr
8143 */
8145 {
8146 LIS_12,
8147 ADDIS_11_11,
8148 LWZ_0_12,
8149 ADDI_11_11,
8150 MTCTR_0,
8151 ADD_0_11_11,
8152 LWZ_12_12,
8153 ADD_11_0_11,
8154 BCTR,
8155 NOP,
8156 NOP,
8157 NOP,
8158 NOP,
8159 NOP,
8160 NOP,
8161 NOP
8162 };
8169 /* Build the branch table, one for each plt entry (less one),
8170 and perhaps some padding. */
8176 {
8179 }
8181 {
8184 }
8190 /* Last comes the PLTresolve stub. */
8192 {
8193 bfd_vma bcl;
8196 {
8199 }
8213 {
8218 }
8219 else
8220 {
8225 }
8226 }
8227 else
8228 {
8230 {
8233 }
8243 {
8248 }
8249 else
8250 {
8255 }
8256 }
8257 }
8260 }
8261 \f
8262 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
8264 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
8266 #define ELF_ARCH bfd_arch_powerpc
8267 #define ELF_MACHINE_CODE EM_PPC
8268 #ifdef __QNXTARGET__
8269 #define ELF_MAXPAGESIZE 0x1000
8270 #else
8271 #define ELF_MAXPAGESIZE 0x10000
8272 #endif
8273 #define ELF_MINPAGESIZE 0x1000
8274 #define ELF_COMMONPAGESIZE 0x1000
8275 #define elf_info_to_howto ppc_elf_info_to_howto
8277 #ifdef EM_CYGNUS_POWERPC
8278 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
8279 #endif
8281 #ifdef EM_PPC_OLD
8282 #define ELF_MACHINE_ALT2 EM_PPC_OLD
8283 #endif
8285 #define elf_backend_plt_not_loaded 1
8286 #define elf_backend_can_gc_sections 1
8287 #define elf_backend_can_refcount 1
8288 #define elf_backend_rela_normal 1
8290 #define bfd_elf32_mkobject ppc_elf_mkobject
8291 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
8292 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
8293 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
8294 #define bfd_elf32_bfd_reloc_name_lookup ppc_elf_reloc_name_lookup
8295 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
8296 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create
8297 #define bfd_elf32_get_synthetic_symtab ppc_elf_get_synthetic_symtab
8299 #define elf_backend_object_p ppc_elf_object_p
8300 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
8301 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
8302 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
8303 #define elf_backend_relocate_section ppc_elf_relocate_section
8304 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
8305 #define elf_backend_check_relocs ppc_elf_check_relocs
8306 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol
8307 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
8308 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
8309 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
8310 #define elf_backend_hash_symbol ppc_elf_hash_symbol
8311 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
8312 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
8313 #define elf_backend_fake_sections ppc_elf_fake_sections
8314 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
8315 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
8316 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
8317 #define elf_backend_write_core_note ppc_elf_write_core_note
8318 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
8319 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing
8320 #define elf_backend_final_write_processing ppc_elf_final_write_processing
8321 #define elf_backend_write_section ppc_elf_write_section
8322 #define elf_backend_get_sec_type_attr ppc_elf_get_sec_type_attr
8323 #define elf_backend_plt_sym_val ppc_elf_plt_sym_val
8324 #define elf_backend_action_discarded ppc_elf_action_discarded
8325 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
8329 /* VxWorks Target */
8331 #undef TARGET_LITTLE_SYM
8332 #undef TARGET_LITTLE_NAME
8334 #undef TARGET_BIG_SYM
8335 #define TARGET_BIG_SYM bfd_elf32_powerpc_vxworks_vec
8336 #undef TARGET_BIG_NAME
8339 /* VxWorks uses the elf default section flags for .plt. */
8342 {
8350 }
8352 /* Like ppc_elf_link_hash_table_create, but overrides
8353 appropriately for VxWorks. */
8356 {
8361 {
8369 }
8371 }
8373 /* Tweak magic VxWorks symbols as they are loaded. */
8374 static bfd_boolean
8382 {
8384 valp))
8388 }
8390 static void
8392 {
8395 }
8397 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
8398 define it. */
8399 #undef elf_backend_want_plt_sym
8400 #define elf_backend_want_plt_sym 1
8401 #undef elf_backend_want_got_plt
8402 #define elf_backend_want_got_plt 1
8403 #undef elf_backend_got_symbol_offset
8404 #define elf_backend_got_symbol_offset 0
8405 #undef elf_backend_plt_not_loaded
8406 #define elf_backend_plt_not_loaded 0
8407 #undef elf_backend_plt_readonly
8408 #define elf_backend_plt_readonly 1
8409 #undef elf_backend_got_header_size
8410 #define elf_backend_got_header_size 12
8412 #undef bfd_elf32_get_synthetic_symtab
8414 #undef bfd_elf32_bfd_link_hash_table_create
8415 #define bfd_elf32_bfd_link_hash_table_create \
8416 ppc_elf_vxworks_link_hash_table_create
8417 #undef elf_backend_add_symbol_hook
8418 #define elf_backend_add_symbol_hook \
8419 ppc_elf_vxworks_add_symbol_hook
8420 #undef elf_backend_link_output_symbol_hook
8421 #define elf_backend_link_output_symbol_hook \
8422 elf_vxworks_link_output_symbol_hook
8423 #undef elf_backend_final_write_processing
8424 #define elf_backend_final_write_processing \
8425 ppc_elf_vxworks_final_write_processing
8426 #undef elf_backend_get_sec_type_attr
8427 #define elf_backend_get_sec_type_attr \
8428 ppc_elf_vxworks_get_sec_type_attr
8429 #undef elf_backend_emit_relocs
8430 #define elf_backend_emit_relocs \
8431 elf_vxworks_emit_relocs
8433 #undef elf32_bed
8434 #define elf32_bed ppc_elf_vxworks_bed