| blob | 5db64b0fa651d8b33822237eb454932f5bad007b |
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 {
2351 }
2353 static bfd_boolean
2355 {
2360 }
2362 static long
2366 {
2371 bfd_vma stub_vma;
2395 /* Call common code to handle old-style executable PLTs. */
2400 /* If this object was prelinked, the prelinker stored the address
2401 of .glink at got[1]. If it wasn't prelinked, got[1] will be zero. */
2404 {
2418 {
2419 Elf_Internal_Dyn dyn;
2426 {
2434 }
2435 }
2437 }
2439 /* Otherwise we read the first plt entry. */
2441 {
2444 }
2449 /* The .glink section usually does not survive the final
2450 link; search for the section (usually .text) where the
2451 glink stubs now reside. */
2456 /* Determine glink PLT resolver by reading the relative branch
2457 from the first glink stub. */
2460 {
2463 /* The first glink stub may either branch to the resolver ... */
2468 /* ... or fall through a bunch of NOPs. */
2475 {
2478 }
2479 }
2483 /* If the stubs are those for -shared/-pie then we might have
2484 multiple stubs for each plt entry. If that is the case then
2485 there is no way to associate stubs with their plt entries short
2486 of figuring out the GOT pointer value used in the stub. */
2514 {
2518 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
2519 we are defining a symbol, ensure one of them is set. */
2534 }
2536 /* Add a symbol at the start of the glink branch table. */
2545 s++;
2546 count++;
2549 {
2550 /* Add a symbol for the glink PLT resolver. */
2559 s++;
2560 count++;
2561 }
2564 }
2565 \f
2566 /* The following functions are specific to the ELF linker, while
2567 functions above are used generally. They appear in this file more
2568 or less in the order in which they are called. eg.
2569 ppc_elf_check_relocs is called early in the link process,
2570 ppc_elf_finish_dynamic_sections is one of the last functions
2571 called. */
2573 /* The PPC linker needs to keep track of the number of relocs that it
2574 decides to copy as dynamic relocs in check_relocs for each symbol.
2575 This is so that it can later discard them if they are found to be
2576 unnecessary. We store the information in a field extending the
2577 regular ELF linker hash table. */
2579 struct ppc_elf_dyn_relocs
2580 {
2583 /* The input section of the reloc. */
2586 /* Total number of relocs copied for the input section. */
2587 bfd_size_type count;
2589 /* Number of pc-relative relocs copied for the input section. */
2590 bfd_size_type pc_count;
2591 };
2593 /* Track PLT entries needed for a given symbol. We might need more
2594 than one glink entry per symbol. */
2595 struct plt_entry
2596 {
2599 /* -fPIC uses multiple GOT sections, one per file, called ".got2".
2600 This field stores the offset into .got2 used to initialise the
2601 GOT pointer reg. It will always be at least 32768 (and for
2602 current gcc this is the only offset used). */
2603 bfd_vma addend;
2605 /* The .got2 section. */
2608 /* PLT refcount or offset. */
2609 union
2610 {
2611 bfd_signed_vma refcount;
2612 bfd_vma offset;
2615 /* .glink stub offset. */
2616 bfd_vma glink_offset;
2617 };
2619 /* Of those relocs that might be copied as dynamic relocs, this function
2620 selects those that must be copied when linking a shared library,
2621 even when the symbol is local. */
2623 static int
2626 {
2628 {
2645 }
2646 }
2648 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
2649 copying dynamic variables from a shared lib into an app's dynbss
2650 section, and instead use a dynamic relocation to point into the
2651 shared lib. */
2652 #define ELIMINATE_COPY_RELOCS 1
2654 /* PPC ELF linker hash entry. */
2656 struct ppc_elf_link_hash_entry
2657 {
2660 /* If this symbol is used in the linker created sections, the processor
2661 specific backend uses this field to map the field into the offset
2662 from the beginning of the section. */
2665 /* Track dynamic relocs copied for this symbol. */
2668 /* Contexts in which symbol is used in the GOT (or TOC).
2669 TLS_GD .. TLS_TLS bits are or'd into the mask as the
2670 corresponding relocs are encountered during check_relocs.
2671 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
2672 indicate the corresponding GOT entry type is not needed. */
2681 /* Nonzero if we have seen a small data relocation referring to this
2682 symbol. */
2684 };
2686 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent))
2688 /* PPC ELF linker hash table. */
2690 struct ppc_elf_link_hash_table
2691 {
2694 /* Short-cuts to get to dynamic linker sections. */
2707 /* The (unloaded but important) .rela.plt.unloaded on VxWorks. */
2710 /* The .got.plt section (VxWorks only)*/
2713 /* Shortcut to __tls_get_addr. */
2716 /* The bfd that forced an old-style PLT. */
2719 /* TLS local dynamic got entry handling. */
2721 bfd_signed_vma refcount;
2722 bfd_vma offset;
2725 /* Offset of PltResolve function in glink. */
2726 bfd_vma glink_pltresolve;
2728 /* Size of reserved GOT entries. */
2730 /* Non-zero if allocating the header left a gap. */
2733 /* The type of PLT we have chosen to use. */
2736 /* Set if we should emit symbols for stubs. */
2739 /* True if the target system is VxWorks. */
2742 /* The size of PLT entries. */
2744 /* The distance between adjacent PLT slots. */
2746 /* The size of the first PLT entry. */
2749 /* Small local sym to section mapping cache. */
2751 };
2753 /* Get the PPC ELF linker hash table from a link_info structure. */
2755 #define ppc_elf_hash_table(p) \
2756 ((struct ppc_elf_link_hash_table *) (p)->hash)
2758 /* Create an entry in a PPC ELF linker hash table. */
2764 {
2765 /* Allocate the structure if it has not already been allocated by a
2766 subclass. */
2768 {
2773 }
2775 /* Call the allocation method of the superclass. */
2778 {
2782 }
2785 }
2787 /* Create a PPC ELF linker hash table. */
2791 {
2799 ppc_elf_link_hash_newfunc,
2801 {
2804 }
2824 }
2826 /* Create .got and the related sections. */
2828 static bfd_boolean
2830 {
2833 flagword flags;
2844 {
2848 }
2849 else
2850 {
2851 /* The powerpc .got has a blrl instruction in it. Mark it
2852 executable. */
2857 }
2867 }
2869 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2870 to output sections (just like _bfd_elf_create_dynamic_sections has
2871 to create .dynbss and .rela.bss). */
2873 static bfd_boolean
2875 {
2878 flagword flags;
2906 {
2913 }
2926 /* The VxWorks PLT is a loaded section with contents. */
2929 }
2931 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2933 static void
2937 {
2944 {
2946 {
2950 /* Add reloc counts against the indirect sym to the direct sym
2951 list. Merge any entries against the same section. */
2953 {
2958 {
2963 }
2966 }
2968 }
2972 }
2977 /* If called to transfer flags for a weakdef during processing
2978 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
2979 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
2991 /* If we were called to copy over info for a weak sym, that's all. */
2995 /* Copy over the GOT refcount entries that we may have already seen to
2996 the symbol which just became indirect. */
3000 /* And plt entries. */
3002 {
3004 {
3009 {
3014 {
3018 }
3021 }
3023 }
3027 }
3030 {
3038 }
3039 }
3041 /* Hook called by the linker routine which adds symbols from an object
3042 file. We use it to put .comm items in .sbss, and not .bss. */
3044 static bfd_boolean
3052 {
3057 {
3058 /* Common symbols less than or equal to -G nn bytes are automatically
3059 put into .sbss. */
3064 {
3072 flags);
3075 }
3079 }
3082 }
3083 \f
3084 static bfd_boolean
3087 {
3096 }
3098 /* Create a special linker section. */
3100 static bfd_boolean
3103 flagword flags,
3105 {
3112 /* Record the first bfd that needs the special sections. */
3118 flags);
3125 }
3127 /* Find a linker generated pointer with a given addend and type. */
3130 elf_find_pointer_linker_section
3132 bfd_vma addend,
3134 {
3140 }
3142 /* Allocate a pointer to live in a linker created section. */
3144 static bfd_boolean
3149 {
3153 bfd_size_type amt;
3157 /* Is this a global symbol? */
3159 {
3162 /* Has this symbol already been allocated? If so, our work is done. */
3166 lsect))
3170 }
3171 else
3172 {
3175 /* Allocation of a pointer to a local symbol. */
3178 /* Allocate a table to hold the local symbols if first time. */
3180 {
3191 }
3193 /* Has this symbol already been allocated? If so, our work is done. */
3196 lsect))
3200 }
3202 /* Allocate space for a pointer in the linker section, and allocate
3203 a new pointer record from internal memory. */
3219 #ifdef DEBUG
3224 #endif
3227 }
3229 static bfd_boolean
3234 {
3239 {
3247 }
3253 }
3255 static bfd_boolean
3258 {
3267 {
3277 }
3280 }
3284 {
3293 }
3295 static void
3297 {
3300 abfd,
3303 }
3305 /* Look through the relocs for a section during the first phase, and
3306 allocate space in the global offset table or procedure linkage
3307 table. */
3309 static bfd_boolean
3314 {
3326 /* Don't do anything special with non-loaded, non-alloced sections.
3327 In particular, any relocs in such sections should not affect GOT
3328 and PLT reference counting (ie. we don't allow them to create GOT
3329 or PLT entries), there's no possibility or desire to optimize TLS
3330 relocs, and there's not much point in propagating relocs to shared
3331 libs that the dynamic linker won't relocate. */
3335 #ifdef DEBUG
3338 #endif
3342 /* Initialize howto table if not already done. */
3356 {
3365 else
3366 {
3371 }
3373 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
3374 This shows up in particular in an R_PPC_ADDR32 in the eabi
3375 startup code. */
3379 {
3385 }
3391 {
3408 /* We have a new-style __tls_get_addr call with a marker
3409 reloc. */
3410 ;
3411 else
3412 /* Mark this section as having an old-style call. */
3415 }
3418 {
3421 /* These special tls relocs tie a call to __tls_get_addr with
3422 its parameter symbol. */
3453 dogottls:
3455 /* Fall thru */
3457 /* GOT16 relocations */
3462 /* This symbol requires a global offset table entry. */
3464 {
3469 }
3471 {
3474 }
3475 else
3476 /* This is a global offset table entry for a local symbol. */
3481 /* Indirect .sdata relocation. */
3484 {
3487 }
3496 {
3499 }
3502 /* Indirect .sdata2 relocation. */
3505 {
3508 }
3517 {
3520 }
3525 {
3528 }
3533 {
3536 }
3541 {
3544 }
3549 {
3552 }
3558 {
3561 }
3569 {
3572 }
3581 {
3584 }
3595 #ifdef DEBUG
3597 #endif
3598 /* This symbol requires a procedure linkage table entry. We
3599 actually build the entry in finish_dynamic_symbol,
3600 because this might be a case of linking PIC code without
3601 linking in any dynamic objects, in which case we don't
3602 need to generate a procedure linkage table after all. */
3605 {
3606 /* It does not make sense to have a procedure linkage
3607 table entry for a local symbol. */
3610 abfd,
3611 sec,
3616 }
3617 else
3618 {
3622 {
3625 }
3629 }
3632 /* The following relocations don't need to propagate the
3633 relocation if linking a shared object since they are
3634 section relative. */
3653 /* These are just markers. */
3660 /* These should only appear in dynamic objects. */
3667 /* These aren't handled yet. We'll report an error later. */
3676 /* This refers only to functions defined in the shared library. */
3679 {
3682 }
3685 /* This relocation describes the C++ object vtable hierarchy.
3686 Reconstruct it for later use during GC. */
3692 /* This relocation describes which C++ vtable entries are actually
3693 used. Record for later use during GC. */
3701 /* We shouldn't really be seeing these. */
3711 /* Nor these. */
3722 {
3723 /* Old -fPIC gcc code has .long LCTOC1-LCFx just before
3724 the start of a function, which assembles to a REL32
3725 reference to .got2. If we detect one of these, then
3726 force the old PLT layout because the linker cannot
3727 reliably deduce the GOT pointer value needed for
3728 PLT call stubs. */
3732 r_symndx);
3734 {
3737 }
3738 }
3741 /* fall through */
3751 {
3752 /* We may need a plt entry if the symbol turns out to be
3753 a function defined in a dynamic object. */
3757 /* We may need a copy reloc too. */
3760 }
3770 {
3772 {
3775 }
3777 }
3778 /* fall through */
3785 {
3786 /* We may need a plt entry if the symbol turns out to be
3787 a function defined in a dynamic object. */
3791 }
3793 dodyn:
3794 /* If we are creating a shared library, and this is a reloc
3795 against a global symbol, or a non PC relative reloc
3796 against a local symbol, then we need to copy the reloc
3797 into the shared library. However, if we are linking with
3798 -Bsymbolic, we do not need to copy a reloc against a
3799 global symbol which is defined in an object we are
3800 including in the link (i.e., DEF_REGULAR is set). At
3801 this point we have not seen all the input files, so it is
3802 possible that DEF_REGULAR is not set now but will be set
3803 later (it is never cleared). In case of a weak definition,
3804 DEF_REGULAR may be cleared later by a strong definition in
3805 a shared library. We account for that possibility below by
3806 storing information in the dyn_relocs field of the hash
3807 table entry. A similar situation occurs when creating
3808 shared libraries and symbol visibility changes render the
3809 symbol local.
3811 If on the other hand, we are creating an executable, we
3812 may need to keep relocations for symbols satisfied by a
3813 dynamic library if we manage to avoid copy relocs for the
3814 symbol. */
3821 || (ELIMINATE_COPY_RELOCS
3826 {
3830 #ifdef DEBUG
3832 "ppc_elf_check_relocs needs to "
3836 #endif
3838 {
3842 sreloc = _bfd_elf_make_dynamic_reloc_section
3847 }
3849 /* If this is a global symbol, we count the number of
3850 relocations we need for this symbol. */
3852 {
3854 }
3855 else
3856 {
3857 /* Track dynamic relocs needed for local syms too.
3858 We really need local syms available to do this
3859 easily. Oh well. */
3871 }
3875 {
3884 }
3889 }
3892 }
3893 }
3896 }
3897 \f
3899 /* Merge object attributes from IBFD into OBFD. Raise an error if
3900 there are conflicting attributes. */
3901 static bfd_boolean
3903 {
3908 {
3909 /* This is the first object. Copy the attributes. */
3912 /* Use the Tag_null value to indicate the attributes have been
3913 initialized. */
3917 }
3922 /* Check for conflicting Tag_GNU_Power_ABI_FP attributes and merge
3923 non-conflicting ones. */
3927 {
3932 ;
3934 _bfd_error_handler
3937 _bfd_error_handler
3941 _bfd_error_handler
3945 _bfd_error_handler
3949 _bfd_error_handler
3952 _bfd_error_handler
3955 else
3956 _bfd_error_handler
3959 }
3961 /* Check for conflicting Tag_GNU_Power_ABI_Vector attributes and
3962 merge non-conflicting ones. */
3966 {
3970 {
3974 }
3977 {
3981 }
3987 ;
3988 /* For now, allow generic to transition to AltiVec or SPE
3989 without a warning. If GCC marked files with their stack
3990 alignment and used don't-care markings for files which are
3991 not affected by the vector ABI, we could warn about this
3992 case too. */
3996 ;
3998 _bfd_error_handler
4002 _bfd_error_handler
4005 else
4006 _bfd_error_handler
4009 }
4011 /* Check for conflicting Tag_GNU_Power_ABI_Struct_Return attributes
4012 and merge non-conflicting ones. */
4016 {
4021 ;
4023 _bfd_error_handler
4026 _bfd_error_handler
4029 _bfd_error_handler
4032 else
4033 _bfd_error_handler
4036 }
4038 /* Merge Tag_compatibility attributes and any common GNU ones. */
4042 }
4044 /* Merge backend specific data from an object file to the output
4045 object file when linking. */
4047 static bfd_boolean
4049 {
4050 flagword old_flags;
4051 flagword new_flags;
4052 bfd_boolean error;
4057 /* Check if we have the same endianess. */
4067 {
4068 /* First call, no flags set. */
4071 }
4073 /* Compatible flags are ok. */
4075 ;
4077 /* Incompatible flags. */
4078 else
4079 {
4080 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
4081 to be linked with either. */
4085 {
4090 }
4093 {
4098 }
4100 /* The output is -mrelocatable-lib iff both the input files are. */
4104 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
4105 but each input file is either -mrelocatable or -mrelocatable-lib. */
4111 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
4112 any module uses it. */
4118 /* Warn about any other mismatches. */
4120 {
4126 }
4129 {
4132 }
4133 }
4136 }
4137 \f
4138 /* Choose which PLT scheme to use, and set .plt flags appropriately.
4139 Returns -1 on error, 0 for old PLT, 1 for new PLT. */
4140 int
4145 {
4147 flagword flags;
4152 {
4155 else
4156 {
4160 /* Look through the reloc flags left by ppc_elf_check_relocs.
4161 Use the old style bss plt if a file makes plt calls
4162 without using the new relocs, and if ld isn't given
4163 --secure-plt and we never see REL16 relocs. */
4168 {
4172 {
4176 }
4177 }
4179 }
4180 }
4189 {
4193 /* The new PLT is a loaded section. */
4198 /* The new GOT is not executable. */
4202 }
4203 else
4204 {
4205 /* Stop an unused .glink section from affecting .text alignment. */
4209 }
4211 }
4212 \f
4213 /* Return the section that should be marked against GC for a given
4214 relocation. */
4222 {
4225 {
4229 }
4232 }
4234 /* Update the got, plt and dynamic reloc reference counts for the
4235 section being removed. */
4237 static bfd_boolean
4242 {
4266 {
4273 {
4285 {
4286 /* Everything must go for SEC. */
4289 }
4290 }
4294 {
4316 {
4319 }
4321 {
4324 }
4334 /* Fall thru */
4357 {
4362 }
4367 }
4368 }
4370 }
4371 \f
4372 /* Set plt output section type, htab->tls_get_addr, and call the
4373 generic ELF tls_setup function. */
4375 asection *
4377 {
4384 {
4387 }
4392 }
4394 /* Return TRUE iff REL is a branch reloc with a global symbol matching
4395 HASH. */
4397 static bfd_boolean
4401 {
4417 {
4427 }
4429 }
4431 /* Run through all the TLS relocs looking for optimization
4432 opportunities. */
4434 bfd_boolean
4437 {
4447 /* Make two passes through the relocs. First time check that tls
4448 relocs involved in setting up a tls_get_addr call are indeed
4449 followed by such a call. If they are not, exclude them from
4450 the optimizations done on the second pass. */
4453 {
4459 {
4462 /* Read the relocations. */
4470 {
4476 bfd_boolean is_local;
4482 {
4490 }
4500 {
4504 /* Fall thru */
4508 /* These relocs should never be against a symbol
4509 defined in a shared lib. Leave them alone if
4510 that turns out to be the case. */
4514 /* LD -> LE */
4522 /* Fall thru */
4527 /* GD -> LE */
4529 else
4530 /* GD -> IE */
4540 {
4541 /* IE -> LE */
4545 }
4546 else
4551 }
4554 {
4564 /* Uh oh, we didn't find the expected call. We
4565 could just mark this symbol to exclude it
4566 from tls optimization but it's safer to skip
4567 the entire section. */
4570 }
4573 {
4576 }
4577 else
4578 {
4584 {
4591 {
4595 }
4596 }
4604 }
4607 {
4608 /* We managed to get rid of a got entry. */
4611 }
4614 {
4620 }
4624 }
4628 }
4632 {
4635 else
4637 }
4638 }
4640 }
4641 \f
4642 /* Return true if we have dynamic relocs that apply to read-only sections. */
4644 static bfd_boolean
4646 {
4650 {
4657 }
4659 }
4661 /* Adjust a symbol defined by a dynamic object and referenced by a
4662 regular object. The current definition is in some section of the
4663 dynamic object, but we're not including those sections. We have to
4664 change the definition to something the rest of the link can
4665 understand. */
4667 static bfd_boolean
4670 {
4674 #ifdef DEBUG
4677 #endif
4679 /* Make sure we know what is going on here. */
4688 /* Deal with function syms. */
4691 {
4692 /* Clear procedure linkage table information for any symbol that
4693 won't need a .plt entry. */
4702 {
4703 /* A PLT entry is not required/allowed when:
4705 1. We are not using ld.so; because then the PLT entry
4706 can't be set up, so we can't use one. In this case,
4707 ppc_elf_adjust_dynamic_symbol won't even be called.
4709 2. GC has rendered the entry unused.
4711 3. We know for certain that a call to this symbol
4712 will go to this object, or will remain undefined. */
4715 }
4716 else
4717 {
4718 /* After adjust_dynamic_symbol, non_got_ref set means that
4719 dyn_relocs for this symbol should be discarded.
4720 If we get here we know we are making a PLT entry for this
4721 symbol, and in an executable we'd normally resolve
4722 relocations against this symbol to the PLT entry. Allow
4723 dynamic relocs if the reference is weak, and the dynamic
4724 relocs will not cause text relocation. */
4731 }
4733 }
4734 else
4737 /* If this is a weak symbol, and there is a real definition, the
4738 processor independent code will have arranged for us to see the
4739 real definition first, and we can just use the same value. */
4741 {
4749 }
4751 /* This is a reference to a symbol defined by a dynamic object which
4752 is not a function. */
4754 /* If we are creating a shared library, we must presume that the
4755 only references to the symbol are via the global offset table.
4756 For such cases we need not do anything here; the relocations will
4757 be handled correctly by relocate_section. */
4761 /* If there are no references to this symbol that do not use the
4762 GOT, we don't need to generate a copy reloc. */
4766 /* If we didn't find any dynamic relocs in read-only sections, then
4767 we'll be keeping the dynamic relocs and avoiding the copy reloc.
4768 We can't do this if there are any small data relocations. This
4769 doesn't work on VxWorks, where we can not have dynamic
4770 relocations (other than copy and jump slot relocations) in an
4771 executable. */
4777 {
4780 }
4783 {
4787 }
4789 /* We must allocate the symbol in our .dynbss section, which will
4790 become part of the .bss section of the executable. There will be
4791 an entry for this symbol in the .dynsym section. The dynamic
4792 object will contain position independent code, so all references
4793 from the dynamic object to this symbol will go through the global
4794 offset table. The dynamic linker will use the .dynsym entry to
4795 determine the address it must put in the global offset table, so
4796 both the dynamic object and the regular object will refer to the
4797 same memory location for the variable.
4799 Of course, if the symbol is referenced using SDAREL relocs, we
4800 must instead allocate it in .sbss. */
4804 else
4808 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
4809 copy the initial value out of the dynamic object and into the
4810 runtime process image. We need to remember the offset into the
4811 .rela.bss section we are going to use. */
4813 {
4818 else
4823 }
4826 }
4827 \f
4828 /* Generate a symbol to mark plt call stubs. For non-PIC code the sym is
4829 xxxxxxxx.plt_call32.<callee> where xxxxxxxx is a hex number, usually 0,
4830 specifying the addend on the plt relocation. For -fpic code, the sym
4831 is xxxxxxxx.plt_pic32.<callee>, and for -fPIC
4832 xxxxxxxx.got2.plt_pic32.<callee>. */
4834 static bfd_boolean
4838 {
4847 else
4867 {
4876 }
4878 }
4880 /* Allocate NEED contiguous space in .got, and return the offset.
4881 Handles allocation of the got header when crossing 32k. */
4883 static bfd_vma
4885 {
4886 bfd_vma where;
4890 {
4893 }
4894 else
4895 {
4898 {
4901 }
4902 else
4903 {
4906 {
4909 }
4912 }
4913 }
4915 }
4917 /* Allocate space in associated reloc sections for dynamic relocs. */
4919 static bfd_boolean
4921 {
4931 /* When warning symbols are created, they **replace** the "real"
4932 entry in the hash table, thus we never get to see the real
4933 symbol in a hash traversal. So look at it now. */
4938 {
4945 {
4946 /* Make sure this symbol is output as a dynamic symbol. */
4949 {
4952 }
4956 {
4960 {
4962 {
4965 }
4970 {
4973 }
4978 {
4981 }
4987 }
4988 else
4989 {
4991 {
4992 /* If this is the first .plt entry, make room
4993 for the special first entry. */
4997 /* The PowerPC PLT is actually composed of two
4998 parts, the first part is 2 words (for a load
4999 and a jump), and then there is a remaining
5000 word available at the end. */
5007 /* If this symbol is not defined in a regular
5008 file, and we are not generating a shared
5009 library, then set the symbol to this location
5010 in the .plt. This is required to make
5011 function pointers compare as equal between
5012 the normal executable and the shared library. */
5016 {
5019 }
5021 /* Make room for this entry. */
5023 /* After the 8192nd entry, room for two entries
5024 is allocated. */
5030 }
5032 }
5034 /* We also need to make an entry in the .rela.plt section. */
5036 {
5040 {
5041 /* Allocate space for the unloaded relocations. */
5043 {
5046 {
5050 }
5055 }
5057 /* Every PLT entry has an associated GOT entry in
5058 .got.plt. */
5060 }
5062 }
5063 }
5064 else
5066 }
5067 else
5071 {
5074 }
5075 }
5076 else
5077 {
5080 }
5084 {
5085 bfd_boolean dyn;
5088 /* Make sure this symbol is output as a dynamic symbol. */
5092 {
5095 }
5099 {
5101 {
5103 /* We'll just use htab->tlsld_got.offset. This should
5104 always be the case. It's a little odd if we have
5105 a local dynamic reloc against a non-local symbol. */
5107 else
5109 }
5116 }
5117 else
5121 else
5122 {
5129 {
5130 /* All the entries we allocated need relocs.
5131 Except LD only needs one. */
5136 }
5137 }
5138 }
5139 else
5146 /* In the shared -Bsymbolic case, discard space allocated for
5147 dynamic pc-relative relocs against symbols which turn out to be
5148 defined in regular objects. For the normal shared case, discard
5149 space for relocs that have become local due to symbol visibility
5150 changes. */
5153 {
5154 /* Relocs that use pc_count are those that appear on a call insn,
5155 or certain REL relocs (see must_be_dyn_reloc) that can be
5156 generated via assembly. We want calls to protected symbols to
5157 resolve directly to the function rather than going via the plt.
5158 If people want function pointer comparisons to work as expected
5159 then they should avoid writing weird assembly. */
5161 {
5165 {
5170 else
5172 }
5173 }
5176 {
5180 {
5183 else
5185 }
5186 }
5188 /* Discard relocs on undefined symbols that must be local. */
5195 /* Also discard relocs on undefined weak syms with non-default
5196 visibility. */
5199 {
5203 /* Make sure undefined weak symbols are output as a dynamic
5204 symbol in PIEs. */
5207 {
5210 }
5211 }
5212 }
5214 {
5215 /* For the non-shared case, discard space for relocs against
5216 symbols which turn out to need copy relocs or are not
5217 dynamic. */
5221 {
5222 /* Make sure this symbol is output as a dynamic symbol.
5223 Undefined weak syms won't yet be marked as dynamic. */
5226 {
5229 }
5231 /* If that succeeded, we know we'll be keeping all the
5232 relocs. */
5235 }
5239 keep: ;
5240 }
5242 /* Finally, allocate space. */
5244 {
5247 }
5250 }
5252 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
5253 read-only sections. */
5255 static bfd_boolean
5257 {
5265 {
5268 /* Not an error, just cut short the traversal. */
5270 }
5272 }
5274 /* Set the sizes of the dynamic sections. */
5276 static bfd_boolean
5279 {
5282 bfd_boolean relocs;
5285 #ifdef DEBUG
5287 #endif
5293 {
5294 /* Set the contents of the .interp section to the interpreter. */
5296 {
5301 }
5302 }
5309 /* Set up .got offsets for local syms, and space for local dynamic
5310 relocs. */
5312 {
5316 bfd_size_type locsymcount;
5323 {
5330 {
5333 {
5334 /* Input section has been discarded, either because
5335 it is a copy of a linkonce section or due to
5336 linker script /DISCARD/, so we'll be discarding
5337 the relocs too. */
5338 }
5342 {
5343 /* Relocations in vxworks .tls_vars sections are
5344 handled specially by the loader. */
5345 }
5347 {
5354 }
5355 }
5356 }
5368 {
5371 {
5380 }
5381 else
5385 else
5386 {
5391 }
5392 }
5393 else
5395 }
5397 /* Allocate space for global sym dynamic relocs. */
5401 {
5405 }
5406 else
5410 {
5413 /* If we haven't allocated the header, do so now. When we get here,
5414 for old plt/got the got size will be 0 to 32764 (not allocated),
5415 or 32780 to 65536 (header allocated). For new plt/got, the
5416 corresponding ranges are 0 to 32768 and 32780 to 65536. */
5418 {
5423 }
5426 }
5429 {
5431 /* Space for the branch table. */
5433 /* Pad out to align the start of PLTresolve. */
5438 {
5445 {
5454 }
5460 {
5469 }
5470 }
5471 }
5473 /* We've now determined the sizes of the various dynamic sections.
5474 Allocate memory for them. */
5477 {
5490 {
5491 /* We'd like to strip these sections if they aren't needed, but if
5492 we've exported dynamic symbols from them we must leave them.
5493 It's too late to tell BFD to get rid of the symbols. */
5496 /* Strip this section if we don't need it; see the
5497 comment below. */
5498 }
5501 {
5502 /* Strip these too. */
5503 }
5505 {
5507 {
5508 /* Remember whether there are any relocation sections. */
5511 /* We use the reloc_count field as a counter if we need
5512 to copy relocs into the output file. */
5514 }
5515 }
5516 else
5517 {
5518 /* It's not one of our sections, so don't allocate space. */
5520 }
5523 {
5524 /* If we don't need this section, strip it from the
5525 output file. This is mostly to handle .rela.bss and
5526 .rela.plt. We must create both sections in
5527 create_dynamic_sections, because they must be created
5528 before the linker maps input sections to output
5529 sections. The linker does that before
5530 adjust_dynamic_symbol is called, and it is that
5531 function which decides whether anything needs to go
5532 into these sections. */
5535 }
5540 /* Allocate memory for the section contents. */
5544 }
5547 {
5548 /* Add some entries to the .dynamic section. We fill in the
5549 values later, in ppc_elf_finish_dynamic_sections, but we
5550 must add the entries now so that we get the correct size for
5551 the .dynamic section. The DT_DEBUG entry is filled in by the
5552 dynamic linker and used by the debugger. */
5553 #define add_dynamic_entry(TAG, VAL) \
5554 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
5557 {
5560 }
5563 {
5569 }
5572 {
5575 }
5578 {
5583 }
5585 /* If any dynamic relocs apply to a read-only section, then we
5586 need a DT_TEXTREL entry. */
5589 info);
5592 {
5595 }
5599 }
5600 #undef add_dynamic_entry
5603 }
5605 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5607 static bfd_boolean
5609 {
5617 }
5618 \f
5619 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
5622 {
5631 };
5634 {
5639 };
5641 static bfd_boolean
5646 {
5647 struct one_fixup
5648 {
5651 bfd_vma toff;
5652 bfd_vma trampoff;
5653 };
5663 bfd_size_type trampoff;
5668 /* Nothing to do if there are no relocations, and no need to do
5669 anything with non-alloc sections. */
5676 /* Space for a branch around any trampolines. */
5681 /* Get a copy of the native relocations. */
5692 {
5704 {
5719 }
5721 /* Get the value of the symbol referred to by the reloc. */
5723 {
5724 /* A local symbol. */
5727 /* Read this BFD's local symbols. */
5729 {
5737 }
5745 else
5750 }
5751 else
5752 {
5753 /* Global symbol handling. */
5768 {
5772 {
5774 {
5777 }
5778 else
5779 {
5782 }
5783 }
5784 }
5786 ;
5789 {
5792 }
5793 else
5797 }
5799 /* If the branch and target are in the same section, you have
5800 no hope of adding stubs. We'll error out later should the
5801 branch overflow. */
5805 /* There probably isn't any reason to handle symbols in
5806 SEC_MERGE sections; SEC_MERGE doesn't seem a likely
5807 attribute for a code section, and we are only looking at
5808 branches. However, implement it correctly here as a
5809 reference for other target relax_section functions. */
5811 {
5812 /* At this stage in linking, no SEC_MERGE symbol has been
5813 adjusted, so all references to such symbols need to be
5814 passed through _bfd_merged_section_offset. (Later, in
5815 relocate_section, all SEC_MERGE symbols *except* for
5816 section symbols have been adjusted.)
5818 gas may reduce relocations against symbols in SEC_MERGE
5819 sections to a relocation against the section symbol when
5820 the original addend was zero. When the reloc is against
5821 a section symbol we should include the addend in the
5822 offset passed to _bfd_merged_section_offset, since the
5823 location of interest is the original symbol. On the
5824 other hand, an access to "sym+addend" where "sym" is not
5825 a section symbol should not include the addend; Such an
5826 access is presumed to be an offset from "sym"; The
5827 location of interest is just "sym". */
5833 toff);
5837 }
5838 /* PLTREL24 addends are special. */
5842 /* Attempted -shared link of non-pic code loses. */
5851 /* If the branch is in range, no need to do anything. */
5855 /* Look for an existing fixup to this address. */
5861 {
5867 /* Oh dear, we can't reach a trampoline. Don't try to add
5868 one. We'll report an error later. */
5872 {
5876 }
5877 else
5878 {
5882 }
5891 /* Hijack the old relocation. Since we need two
5892 relocations for this use a "composite" reloc. */
5894 stub_rtype);
5899 /* Record the fixup so we don't do it again this section. */
5908 changes++;
5909 }
5910 else
5911 {
5916 /* Nop out the reloc, since we're finalizing things here. */
5918 }
5920 /* Get the section contents. */
5922 {
5923 /* Get cached copy if it exists. */
5926 else
5927 {
5928 /* Go get them off disk. */
5931 }
5932 }
5934 /* Fix up the existing branch to hit the trampoline. */
5937 {
5955 }
5956 }
5958 /* Write out the trampolines. */
5960 {
5963 bfd_vma val;
5966 do
5967 {
5971 }
5979 /* Branch around the trampolines. */
5987 {
5990 }
5991 else
5992 {
5995 }
5999 {
6001 i++;
6005 }
6007 }
6011 {
6014 else
6015 {
6016 /* Cache the symbols for elf_link_input_bfd. */
6018 }
6019 }
6023 {
6026 else
6027 {
6028 /* Cache the section contents for elf_link_input_bfd. */
6030 }
6031 }
6034 {
6035 /* Append sufficient NOP relocs so we can write out relocation
6036 information for the trampolines. */
6046 {
6050 }
6057 }
6064 error_return:
6074 }
6075 \f
6076 /* What to do when ld finds relocations against symbols defined in
6077 discarded sections. */
6079 static unsigned int
6081 {
6089 }
6090 \f
6091 /* Fill in the address for a pointer generated in a linker section. */
6093 static bfd_vma
6097 bfd_vma relocation,
6099 {
6105 {
6106 /* Handle global symbol. */
6112 }
6113 else
6114 {
6115 /* Handle local symbol. */
6121 }
6125 lsect);
6128 /* Offset will always be a multiple of four, so use the bottom bit
6129 as a "written" flag. */
6131 {
6136 }
6142 #ifdef DEBUG
6146 #endif
6148 /* Subtract out the addend, because it will get added back in by the normal
6149 processing. */
6151 }
6153 /* The RELOCATE_SECTION function is called by the ELF backend linker
6154 to handle the relocations for a section.
6156 The relocs are always passed as Rela structures; if the section
6157 actually uses Rel structures, the r_addend field will always be
6158 zero.
6160 This function is responsible for adjust the section contents as
6161 necessary, and (if using Rela relocs and generating a
6162 relocatable output file) adjusting the reloc addend as
6163 necessary.
6165 This function does not have to worry about setting the reloc
6166 address or the reloc symbol index.
6168 LOCAL_SYMS is a pointer to the swapped in local symbols.
6170 LOCAL_SECTIONS is an array giving the section in the input file
6171 corresponding to the st_shndx field of each local symbol.
6173 The global hash table entry for the global symbols can be found
6174 via elf_sym_hashes (input_bfd).
6176 When generating relocatable output, this function must handle
6177 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
6178 going to be the section symbol corresponding to the output
6179 section, which means that the addend must be adjusted
6180 accordingly. */
6182 static bfd_boolean
6191 {
6197 Elf_Internal_Rela outrel;
6203 bfd_boolean is_vxworks_tls;
6205 #ifdef DEBUG
6211 #endif
6215 /* Initialize howto table if not already done. */
6223 /* We have to handle relocations in vxworks .tls_vars sections
6224 specially, because the dynamic loader is 'weird'. */
6231 {
6233 bfd_vma addend;
6234 bfd_reloc_status_type r;
6241 bfd_vma relocation;
6243 bfd_boolean unresolved_reloc;
6244 bfd_boolean warned;
6256 {
6262 }
6263 else
6264 {
6271 }
6274 {
6275 /* For relocs against symbols from removed linkonce sections,
6276 or sections discarded by a linker script, we just want the
6277 section contents zeroed. Avoid any special processing. */
6285 }
6288 {
6292 {
6293 /* R_PPC_PLTREL24 is rather special. If non-zero, the
6294 addend specifies the GOT pointer offset within .got2. */
6296 }
6298 }
6300 /* TLS optimizations. Replace instruction sequences and relocs
6301 based on information we collected in tls_optimize. We edit
6302 RELOCS so that --emit-relocs will output something sensible
6303 for the final instruction stream. */
6309 {
6313 }
6315 /* Ensure reloc mapping code below stays sane. */
6326 {
6334 {
6335 bfd_vma insn;
6342 }
6348 {
6357 else
6360 /* add -> addi. */
6366 /* load and store indexed -> dform. */
6370 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
6375 /* lwax -> lwa. */
6377 else
6384 /* Was PPC_TLS which sits on insn boundary, now
6385 PPC_TPREL16_LO which is at low-order half-word. */
6387 }
6400 {
6401 tls_gdld_hi:
6405 else
6406 {
6410 }
6412 }
6425 {
6427 bfd_vma offset;
6429 tls_ldgd_opt:
6431 /* If not using the newer R_PPC_TLSGD/LD to mark
6432 __tls_get_addr calls, we must trust that the call
6433 stays with its arg setup insns, ie. that the next
6434 reloc is the __tls_get_addr call associated with
6435 the current reloc. Edit both insns. */
6442 {
6443 /* IE */
6449 {
6452 R_PPC_NONE);
6455 }
6459 }
6460 else
6461 {
6462 /* LE */
6465 {
6466 /* Was an LD reloc. */
6469 r_symndx++)
6479 }
6483 {
6489 }
6490 }
6494 {
6495 /* We changed the symbol on an LD reloc. Start over
6496 in order to get h, sym, sec etc. right. */
6497 rel--;
6499 }
6500 }
6505 {
6510 {
6511 /* IE */
6514 }
6515 else
6516 {
6517 /* LE */
6521 }
6524 /* Zap the reloc on the _tls_get_addr call too. */
6527 R_PPC_NONE);
6528 }
6533 {
6538 r_symndx++)
6554 /* Zap the reloc on the _tls_get_addr call too. */
6557 R_PPC_NONE);
6558 rel--;
6560 }
6562 }
6564 /* Handle other relocations that tweak non-addend part of insn. */
6567 {
6571 /* Branch taken prediction relocations. */
6575 /* Fall thru */
6577 /* Branch not taken prediction relocations. */
6588 /* Invert 'y' bit if not the default. */
6594 }
6602 {
6621 /* GOT16 relocations. Like an ADDR16 using the symbol's
6622 address in the GOT as relocation value instead of the
6623 symbol's value itself. Also, create a GOT entry for the
6624 symbol and put the symbol value there. */
6658 dogot:
6659 {
6660 /* Relocation is to the entry for this symbol in the global
6661 offset table. */
6662 bfd_vma off;
6675 {
6676 bfd_boolean dyn;
6681 /* This is actually a static link, or it is a
6682 -Bsymbolic link and the symbol is defined
6683 locally, or the symbol was forced to be local
6684 because of a version file. */
6685 ;
6686 else
6687 {
6690 }
6692 }
6693 else
6694 {
6698 }
6700 /* The offset must always be a multiple of 4. We use the
6701 least significant bit to record whether we have already
6702 processed this entry. */
6706 else
6707 {
6718 /* We might have multiple got entries for this sym.
6719 Initialize them all. */
6720 do
6721 {
6725 {
6728 }
6730 {
6733 }
6735 {
6738 }
6740 {
6743 }
6745 /* Generate relocs for the dynamic linker. */
6751 {
6757 {
6760 {
6767 outrel.r_info
6769 }
6770 }
6777 else
6780 {
6784 }
6789 }
6791 /* Init the .got section contents if we're not
6792 emitting a reloc. */
6793 else
6794 {
6800 {
6806 {
6810 }
6811 }
6814 }
6819 }
6824 }
6830 {
6832 {
6838 {
6842 {
6845 }
6846 }
6847 }
6848 }
6852 + off
6855 /* Addends on got relocations don't make much sense.
6856 x+off@got is actually x@got+off, and since the got is
6857 generated by a hash table traversal, the value in the
6858 got at entry m+n bears little relation to the entry m. */
6862 input_bfd,
6863 input_section,
6866 sym_name);
6867 }
6870 /* Relocations that need no special processing. */
6872 /* It makes no sense to point a local relocation
6873 at a symbol not in this object. */
6875 {
6878 input_bfd,
6879 input_section,
6881 TRUE))
6884 }
6894 /* Relocations that may need to be propagated if this is a shared
6895 object. */
6901 /* The TPREL16 relocs shouldn't really be used in shared
6902 libs as they will result in DT_TEXTREL being set, but
6903 support them anyway. */
6928 /* fall through */
6943 /* If these relocations are not to a named symbol, they can be
6944 handled right here, no need to bother the dynamic linker. */
6948 /* fall through */
6956 /* fall through */
6958 dodyn:
6972 || (ELIMINATE_COPY_RELOCS
6978 {
6981 #ifdef DEBUG
6986 #endif
6988 /* When generating a shared object, these relocations
6989 are copied into the output file to be resolved at run
6990 time. */
6992 {
6993 sreloc = _bfd_elf_get_dynamic_reloc_section
6997 }
7015 {
7019 }
7020 else
7021 {
7026 else
7027 {
7031 ;
7033 {
7036 }
7037 else
7038 {
7041 /* We are turning this relocation into one
7042 against a section symbol. It would be
7043 proper to subtract the symbol's value,
7044 osec->vma, from the emitted reloc addend,
7045 but ld.so expects buggy relocs. */
7049 {
7052 }
7054 #ifdef DEBUG
7059 #endif
7060 }
7063 }
7064 }
7073 /* This reloc will be computed at runtime. We clear the memory
7074 so that it contains predictable value. */
7078 {
7082 }
7083 }
7088 {
7095 else
7099 }
7102 /* Fall thru */
7108 /* Fall thru */
7111 relax32:
7112 {
7119 /* We're clearing the bits for R_PPC_ADDR16_HA
7120 and R_PPC_ADDR16_LO here. */
7124 /* t0 is HA, t1 is LO */
7132 /* Rewrite the reloc and convert one of the trailing nop
7133 relocs to describe this relocation. */
7135 /* The relocs are at the bottom 2 bytes */
7141 rel++;
7142 }
7145 /* Indirect .sdata relocation. */
7148 relocation
7153 /* Indirect .sdata2 relocation. */
7156 relocation
7161 /* Handle the TOC16 reloc. We want to use the offset within the .got
7162 section, not the actual VMA. This is appropriate when generating
7163 an embedded ELF object, for which the .got section acts like the
7164 AIX .toc section. */
7167 {
7170 }
7178 /* Relocation is to the entry for this symbol in the
7179 procedure linkage table. */
7180 {
7186 {
7187 /* We didn't make a PLT entry for this symbol. This
7188 happens when statically linking PIC code, or when
7189 using -Bsymbolic. */
7191 }
7198 else
7202 }
7205 /* Relocate against _SDA_BASE_. */
7207 {
7211 {
7214 }
7221 {
7225 input_bfd,
7226 sym_name,
7228 name);
7229 }
7231 }
7234 /* Relocate against _SDA2_BASE_. */
7236 {
7240 {
7243 }
7248 {
7252 input_bfd,
7253 sym_name,
7255 name);
7260 }
7262 }
7265 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
7268 {
7273 {
7276 }
7283 {
7286 }
7289 {
7292 }
7295 {
7297 }
7298 else
7299 {
7303 input_bfd,
7304 sym_name,
7306 name);
7311 }
7318 }
7319 }
7322 /* Relocate against the beginning of the section. */
7328 {
7331 }
7335 /* Negative relocations. */
7361 input_bfd,
7363 sym_name);
7368 }
7370 /* Do any further special processing. */
7372 {
7383 /* It's just possible that this symbol is a weak symbol
7384 that's not actually defined anywhere. In that case,
7385 'sec' would be NULL, and we should leave the symbol
7386 alone (it will be set to zero elsewhere in the link). */
7389 /* Fall thru */
7397 /* Add 0x10000 if sign bit in 0:15 is set.
7398 Bits 0:15 are not used. */
7401 }
7403 #ifdef DEBUG
7408 sym_name,
7409 r_symndx,
7412 #endif
7417 {
7420 input_bfd,
7421 input_section,
7424 sym_name);
7426 }
7429 input_bfd,
7430 input_section,
7431 contents,
7433 relocation,
7434 addend);
7437 {
7439 {
7445 {
7446 /* Assume this is a call protected by other code that
7447 detect the symbol is undefined. If this is the case,
7448 we can safely ignore the overflow. If not, the
7449 program is hosed anyway, and a little warning isn't
7450 going to help. */
7453 }
7457 sym_name,
7460 input_bfd,
7461 input_section,
7464 }
7465 else
7466 {
7472 }
7473 }
7474 }
7476 #ifdef DEBUG
7478 #endif
7481 }
7482 \f
7483 #define PPC_LO(v) ((v) & 0xffff)
7484 #define PPC_HI(v) (((v) >> 16) & 0xffff)
7485 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
7487 /* Finish up dynamic symbol handling. We set the contents of various
7488 dynamic sections here. */
7490 static bfd_boolean
7495 {
7498 bfd_boolean doneone;
7500 #ifdef DEBUG
7503 #endif
7511 {
7513 {
7514 Elf_Internal_Rela rela;
7516 bfd_vma reloc_index;
7520 else
7521 {
7527 }
7529 /* This symbol has an entry in the procedure linkage table.
7530 Set it up. */
7532 {
7533 bfd_vma got_offset;
7536 /* The first three entries in .got.plt are reserved. */
7539 /* Use the right PLT. */
7543 /* Fill in the .plt on VxWorks. */
7545 {
7552 }
7553 else
7554 {
7563 }
7570 /* This instruction is an immediate load. The value loaded is
7571 the byte offset of the R_PPC_JMP_SLOT relocation from the
7572 start of the .rela.plt section. The value is stored in the
7573 low-order 16 bits of the load instruction. */
7574 /* NOTE: It appears that this is now an index rather than a
7575 prescaled offset. */
7579 /* This instruction is a PC-relative branch whose target is
7580 the start of the PLT section. The address of this branch
7581 instruction is 20 bytes beyond the start of this PLT entry.
7582 The address is encoded in bits 6-29, inclusive. The value
7583 stored is right-shifted by two bits, permitting a 26-bit
7584 offset. */
7594 /* Fill in the GOT entry corresponding to this PLT slot with
7595 the address immediately after the the "bctr" instruction
7596 in this PLT entry. */
7603 {
7604 /* Fill in a couple of entries in .rela.plt.unloaded. */
7610 /* Provide the @ha relocation for the first instruction. */
7615 R_PPC_ADDR16_HA);
7620 /* Provide the @l relocation for the second instruction. */
7625 R_PPC_ADDR16_LO);
7630 /* Provide a relocation for the GOT entry corresponding to this
7631 PLT slot. Point it at the middle of the .plt entry. */
7636 R_PPC_ADDR32);
7639 }
7641 /* VxWorks uses non-standard semantics for R_PPC_JMP_SLOT.
7642 In particular, the offset for the relocation is not the
7643 address of the PLT entry for this function, as specified
7644 by the ABI. Instead, the offset is set to the address of
7645 the GOT slot for this function. See EABI 4.4.4.1. */
7650 }
7651 else
7652 {
7657 {
7658 /* We don't need to fill in the .plt. The ppc dynamic
7659 linker will fill it in. */
7660 }
7661 else
7662 {
7668 }
7669 }
7671 /* Fill in the entry in the .rela.plt section. */
7680 {
7681 /* Mark the symbol as undefined, rather than as
7682 defined in the .plt section. Leave the value if
7683 there were any relocations where pointer equality
7684 matters (this is a clue for the dynamic linker, to
7685 make function pointer comparisons work between an
7686 application and shared library), otherwise set it
7687 to zero. */
7692 {
7693 /* This breaks function pointer comparisons, but
7694 that is better than breaking tests for a NULL
7695 function pointer. */
7697 }
7698 }
7700 }
7703 {
7704 bfd_vma plt;
7713 {
7726 {
7735 }
7736 else
7737 {
7746 }
7747 }
7748 else
7749 {
7759 /* We only need one non-PIC glink stub. */
7761 }
7762 }
7763 else
7765 }
7768 {
7770 Elf_Internal_Rela rela;
7773 /* This symbols needs a copy reloc. Set it up. */
7775 #ifdef DEBUG
7777 #endif
7783 else
7792 }
7794 #ifdef DEBUG
7796 #endif
7798 /* Mark some specially defined symbols as absolute. */
7807 }
7808 \f
7809 static enum elf_reloc_type_class
7811 {
7813 {
7824 }
7825 }
7826 \f
7827 /* Finish up the dynamic sections. */
7829 static bfd_boolean
7832 {
7836 bfd_vma got;
7840 #ifdef DEBUG
7842 #endif
7849 else
7857 {
7865 {
7866 Elf_Internal_Dyn dyn;
7872 {
7876 else
7896 {
7900 }
7908 }
7911 }
7912 }
7915 {
7918 {
7923 {
7924 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4
7925 so that a function can easily find the address of
7926 _GLOBAL_OFFSET_TABLE_. */
7930 }
7933 {
7938 }
7939 }
7940 else
7941 {
7948 }
7951 }
7953 /* Fill in the first entry in the VxWorks procedure linkage table. */
7955 {
7956 /* Use the right PLT. */
7962 {
7969 }
7970 else
7971 {
7974 }
7983 {
7984 Elf_Internal_Rela rela;
7989 /* Output the @ha relocation for the first instruction. */
7998 /* Output the @l relocation for the second instruction. */
8007 /* Fix up the remaining relocations. They may have the wrong
8008 symbol index for _G_O_T_ or _P_L_T_ depending on the order
8009 in which symbols were output. */
8011 {
8012 Elf_Internal_Rela rel;
8028 }
8029 }
8030 }
8033 {
8036 bfd_vma res0;
8039 /*
8040 * PIC glink code is the following:
8041 *
8042 * # ith PLT code stub.
8043 * addis 11,30,(plt+(i-1)*4-got)@ha
8044 * lwz 11,(plt+(i-1)*4-got)@l(11)
8045 * mtctr 11
8046 * bctr
8047 *
8048 * # A table of branches, one for each plt entry.
8049 * # The idea is that the plt call stub loads ctr and r11 with these
8050 * # addresses, so (r11 - res_0) gives the plt index * 4.
8051 * res_0: b PLTresolve
8052 * res_1: b PLTresolve
8053 * .
8054 * # Some number of entries towards the end can be nops
8055 * res_n_m3: nop
8056 * res_n_m2: nop
8057 * res_n_m1:
8058 *
8059 * PLTresolve:
8060 * addis 11,11,(1f-res_0)@ha
8061 * mflr 0
8062 * bcl 20,31,1f
8063 * 1: addi 11,11,(1b-res_0)@l
8064 * mflr 12
8065 * mtlr 0
8066 * sub 11,11,12 # r11 = index * 4
8067 * addis 12,12,(got+4-1b)@ha
8068 * lwz 0,(got+4-1b)@l(12) # got[1] address of dl_runtime_resolve
8069 * lwz 12,(got+8-1b)@l(12) # got[2] contains the map address
8070 * mtctr 0
8071 * add 0,11,11
8072 * add 11,0,11 # r11 = index * 12 = reloc offset.
8073 * bctr
8074 */
8076 {
8077 ADDIS_11_11,
8078 MFLR_0,
8079 BCL_20_31,
8080 ADDI_11_11,
8081 MFLR_12,
8082 MTLR_0,
8083 SUB_11_11_12,
8084 ADDIS_12_12,
8085 LWZ_0_12,
8086 LWZ_12_12,
8087 MTCTR_0,
8088 ADD_0_11_11,
8089 ADD_11_0_11,
8090 BCTR,
8091 NOP,
8092 NOP
8093 };
8095 /*
8096 * Non-PIC glink code is a little simpler.
8097 *
8098 * # ith PLT code stub.
8099 * lis 11,(plt+(i-1)*4)@ha
8100 * lwz 11,(plt+(i-1)*4)@l(11)
8101 * mtctr 11
8102 * bctr
8103 *
8104 * The branch table is the same, then comes
8105 *
8106 * PLTresolve:
8107 * lis 12,(got+4)@ha
8108 * addis 11,11,(-res_0)@ha
8109 * lwz 0,(got+4)@l(12) # got[1] address of dl_runtime_resolve
8110 * addi 11,11,(-res_0)@l # r11 = index * 4
8111 * mtctr 0
8112 * add 0,11,11
8113 * lwz 12,(got+8)@l(12) # got[2] contains the map address
8114 * add 11,0,11 # r11 = index * 12 = reloc offset.
8115 * bctr
8116 */
8118 {
8119 LIS_12,
8120 ADDIS_11_11,
8121 LWZ_0_12,
8122 ADDI_11_11,
8123 MTCTR_0,
8124 ADD_0_11_11,
8125 LWZ_12_12,
8126 ADD_11_0_11,
8127 BCTR,
8128 NOP,
8129 NOP,
8130 NOP,
8131 NOP,
8132 NOP,
8133 NOP,
8134 NOP
8135 };
8142 /* Build the branch table, one for each plt entry (less one),
8143 and perhaps some padding. */
8149 {
8152 }
8154 {
8157 }
8163 /* Last comes the PLTresolve stub. */
8165 {
8166 bfd_vma bcl;
8169 {
8172 }
8186 {
8191 }
8192 else
8193 {
8198 }
8199 }
8200 else
8201 {
8203 {
8206 }
8216 {
8221 }
8222 else
8223 {
8228 }
8229 }
8230 }
8233 }
8234 \f
8235 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
8237 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
8239 #define ELF_ARCH bfd_arch_powerpc
8240 #define ELF_MACHINE_CODE EM_PPC
8241 #ifdef __QNXTARGET__
8242 #define ELF_MAXPAGESIZE 0x1000
8243 #else
8244 #define ELF_MAXPAGESIZE 0x10000
8245 #endif
8246 #define ELF_MINPAGESIZE 0x1000
8247 #define ELF_COMMONPAGESIZE 0x1000
8248 #define elf_info_to_howto ppc_elf_info_to_howto
8250 #ifdef EM_CYGNUS_POWERPC
8251 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
8252 #endif
8254 #ifdef EM_PPC_OLD
8255 #define ELF_MACHINE_ALT2 EM_PPC_OLD
8256 #endif
8258 #define elf_backend_plt_not_loaded 1
8259 #define elf_backend_can_gc_sections 1
8260 #define elf_backend_can_refcount 1
8261 #define elf_backend_rela_normal 1
8263 #define bfd_elf32_mkobject ppc_elf_mkobject
8264 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
8265 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
8266 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
8267 #define bfd_elf32_bfd_reloc_name_lookup ppc_elf_reloc_name_lookup
8268 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
8269 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create
8270 #define bfd_elf32_get_synthetic_symtab ppc_elf_get_synthetic_symtab
8272 #define elf_backend_object_p ppc_elf_object_p
8273 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
8274 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
8275 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
8276 #define elf_backend_relocate_section ppc_elf_relocate_section
8277 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
8278 #define elf_backend_check_relocs ppc_elf_check_relocs
8279 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol
8280 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
8281 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
8282 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
8283 #define elf_backend_hash_symbol ppc_elf_hash_symbol
8284 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
8285 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
8286 #define elf_backend_fake_sections ppc_elf_fake_sections
8287 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
8288 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
8289 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
8290 #define elf_backend_write_core_note ppc_elf_write_core_note
8291 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
8292 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing
8293 #define elf_backend_final_write_processing ppc_elf_final_write_processing
8294 #define elf_backend_write_section ppc_elf_write_section
8295 #define elf_backend_get_sec_type_attr ppc_elf_get_sec_type_attr
8296 #define elf_backend_plt_sym_val ppc_elf_plt_sym_val
8297 #define elf_backend_action_discarded ppc_elf_action_discarded
8298 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
8302 /* VxWorks Target */
8304 #undef TARGET_LITTLE_SYM
8305 #undef TARGET_LITTLE_NAME
8307 #undef TARGET_BIG_SYM
8308 #define TARGET_BIG_SYM bfd_elf32_powerpc_vxworks_vec
8309 #undef TARGET_BIG_NAME
8312 /* VxWorks uses the elf default section flags for .plt. */
8315 {
8323 }
8325 /* Like ppc_elf_link_hash_table_create, but overrides
8326 appropriately for VxWorks. */
8329 {
8334 {
8342 }
8344 }
8346 /* Tweak magic VxWorks symbols as they are loaded. */
8347 static bfd_boolean
8355 {
8357 valp))
8361 }
8363 static void
8365 {
8368 }
8370 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
8371 define it. */
8372 #undef elf_backend_want_plt_sym
8373 #define elf_backend_want_plt_sym 1
8374 #undef elf_backend_want_got_plt
8375 #define elf_backend_want_got_plt 1
8376 #undef elf_backend_got_symbol_offset
8377 #define elf_backend_got_symbol_offset 0
8378 #undef elf_backend_plt_not_loaded
8379 #define elf_backend_plt_not_loaded 0
8380 #undef elf_backend_plt_readonly
8381 #define elf_backend_plt_readonly 1
8382 #undef elf_backend_got_header_size
8383 #define elf_backend_got_header_size 12
8385 #undef bfd_elf32_get_synthetic_symtab
8387 #undef bfd_elf32_bfd_link_hash_table_create
8388 #define bfd_elf32_bfd_link_hash_table_create \
8389 ppc_elf_vxworks_link_hash_table_create
8390 #undef elf_backend_add_symbol_hook
8391 #define elf_backend_add_symbol_hook \
8392 ppc_elf_vxworks_add_symbol_hook
8393 #undef elf_backend_link_output_symbol_hook
8394 #define elf_backend_link_output_symbol_hook \
8395 elf_vxworks_link_output_symbol_hook
8396 #undef elf_backend_final_write_processing
8397 #define elf_backend_final_write_processing \
8398 ppc_elf_vxworks_final_write_processing
8399 #undef elf_backend_get_sec_type_attr
8400 #define elf_backend_get_sec_type_attr \
8401 ppc_elf_vxworks_get_sec_type_attr
8402 #undef elf_backend_emit_relocs
8403 #define elf_backend_emit_relocs \
8404 elf_vxworks_emit_relocs
8406 #undef elf32_bed
8407 #define elf32_bed ppc_elf_vxworks_bed