| blob | ab50f1a9ed25520248f4d68d5ca035c23369ef7a |
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, 2010, 2011
4 Free Software Foundation, Inc.
5 Written by Ian Lance Taylor, Cygnus Support.
7 This file is part of BFD, the Binary File Descriptor library.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the
21 Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
22 Boston, MA 02110-1301, USA. */
25 /* This file is based on a preliminary PowerPC ELF ABI. The
26 information may not match the final PowerPC ELF ABI. It includes
27 suggestions from the in-progress Embedded PowerPC ABI, and that
28 information may also not match. */
31 #include <stdarg.h>
41 /* RELA relocations are used here. */
43 static bfd_reloc_status_type ppc_elf_addr16_ha_reloc
45 static bfd_reloc_status_type ppc_elf_unhandled_reloc
48 /* Branch prediction bit for branch taken relocs. */
49 #define BRANCH_PREDICT_BIT 0x200000
50 /* Mask to set RA in memory instructions. */
51 #define RA_REGISTER_MASK 0x001f0000
52 /* Value to shift register by to insert RA. */
53 #define RA_REGISTER_SHIFT 16
55 /* The name of the dynamic interpreter. This is put in the .interp
56 section. */
59 /* For old-style PLT. */
60 /* The number of single-slot PLT entries (the rest use two slots). */
61 #define PLT_NUM_SINGLE_ENTRIES 8192
63 /* For new-style .glink and .plt. */
64 #define GLINK_PLTRESOLVE 16*4
65 #define GLINK_ENTRY_SIZE 4*4
66 #define TLS_GET_ADDR_GLINK_SIZE 12*4
68 /* VxWorks uses its own plt layout, filled in by the static linker. */
70 /* The standard VxWorks PLT entry. */
71 #define VXWORKS_PLT_ENTRY_SIZE 32
72 static const bfd_vma ppc_elf_vxworks_plt_entry
74 {
83 };
84 static const bfd_vma ppc_elf_vxworks_pic_plt_entry
86 {
95 };
97 /* The initial VxWorks PLT entry. */
98 #define VXWORKS_PLT_INITIAL_ENTRY_SIZE 32
99 static const bfd_vma ppc_elf_vxworks_plt0_entry
101 {
110 };
111 static const bfd_vma ppc_elf_vxworks_pic_plt0_entry
113 {
122 };
124 /* For executables, we have some additional relocations in
125 .rela.plt.unloaded, for the kernel loader. */
127 /* The number of non-JMP_SLOT relocations per PLT0 slot. */
128 #define VXWORKS_PLT_NON_JMP_SLOT_RELOCS 3
129 /* The number of relocations in the PLTResolve slot. */
130 #define VXWORKS_PLTRESOLVE_RELOCS 2
131 /* The number of relocations in the PLTResolve slot when when creating
132 a shared library. */
133 #define VXWORKS_PLTRESOLVE_RELOCS_SHLIB 0
135 /* Some instructions. */
136 #define ADDIS_11_11 0x3d6b0000
137 #define ADDIS_11_30 0x3d7e0000
138 #define ADDIS_12_12 0x3d8c0000
139 #define ADDI_11_11 0x396b0000
140 #define ADD_0_11_11 0x7c0b5a14
141 #define ADD_3_12_2 0x7c6c1214
142 #define ADD_11_0_11 0x7d605a14
143 #define B 0x48000000
144 #define BCL_20_31 0x429f0005
145 #define BCTR 0x4e800420
146 #define BEQLR 0x4d820020
147 #define CMPWI_11_0 0x2c0b0000
148 #define LIS_11 0x3d600000
149 #define LIS_12 0x3d800000
150 #define LWZU_0_12 0x840c0000
151 #define LWZ_0_12 0x800c0000
152 #define LWZ_11_3 0x81630000
153 #define LWZ_11_11 0x816b0000
154 #define LWZ_11_30 0x817e0000
155 #define LWZ_12_3 0x81830000
156 #define LWZ_12_12 0x818c0000
157 #define MR_0_3 0x7c601b78
158 #define MR_3_0 0x7c030378
159 #define MFLR_0 0x7c0802a6
160 #define MFLR_12 0x7d8802a6
161 #define MTCTR_0 0x7c0903a6
162 #define MTCTR_11 0x7d6903a6
163 #define MTLR_0 0x7c0803a6
164 #define NOP 0x60000000
165 #define SUB_11_11_12 0x7d6c5850
167 /* Offset of tp and dtp pointers from start of TLS block. */
168 #define TP_OFFSET 0x7000
169 #define DTP_OFFSET 0x8000
171 /* The value of a defined global symbol. */
172 #define SYM_VAL(SYM) \
173 ((SYM)->root.u.def.section->output_section->vma \
174 + (SYM)->root.u.def.section->output_offset \
175 + (SYM)->root.u.def.value)
176 \f
180 /* This reloc does nothing. */
195 /* A standard 32 bit relocation. */
210 /* An absolute 26 bit branch; the lower two bits must be zero.
211 FIXME: we don't check that, we just clear them. */
226 /* A standard 16 bit relocation. */
241 /* A 16 bit relocation without overflow. */
256 /* The high order 16 bits of an address. */
271 /* The high order 16 bits of an address, plus 1 if the contents of
272 the low 16 bits, treated as a signed number, is negative. */
287 /* An absolute 16 bit branch; the lower two bits must be zero.
288 FIXME: we don't check that, we just clear them. */
303 /* An absolute 16 bit branch, for which bit 10 should be set to
304 indicate that the branch is expected to be taken. The lower two
305 bits must be zero. */
320 /* An absolute 16 bit branch, for which bit 10 should be set to
321 indicate that the branch is not expected to be taken. The lower
322 two bits must be zero. */
337 /* A relative 26 bit branch; the lower two bits must be zero. */
352 /* A relative 16 bit branch; the lower two bits must be zero. */
367 /* A relative 16 bit branch. Bit 10 should be set to indicate that
368 the branch is expected to be taken. The lower two bits must be
369 zero. */
384 /* A relative 16 bit branch. Bit 10 should be set to indicate that
385 the branch is not expected to be taken. The lower two bits must
386 be zero. */
401 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the
402 symbol. */
417 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
418 the symbol. */
433 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
434 the symbol. */
449 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
450 the symbol. */
465 /* Like R_PPC_REL24, but referring to the procedure linkage table
466 entry for the symbol. */
481 /* This is used only by the dynamic linker. The symbol should exist
482 both in the object being run and in some shared library. The
483 dynamic linker copies the data addressed by the symbol from the
484 shared library into the object, because the object being
485 run has to have the data at some particular address. */
500 /* Like R_PPC_ADDR32, but used when setting global offset table
501 entries. */
516 /* Marks a procedure linkage table entry for a symbol. */
531 /* Used only by the dynamic linker. When the object is run, this
532 longword is set to the load address of the object, plus the
533 addend. */
548 /* Like R_PPC_REL24, but uses the value of the symbol within the
549 object rather than the final value. Normally used for
550 _GLOBAL_OFFSET_TABLE_. */
565 /* Like R_PPC_ADDR32, but may be unaligned. */
580 /* Like R_PPC_ADDR16, but may be unaligned. */
595 /* 32-bit PC relative */
610 /* 32-bit relocation to the symbol's procedure linkage table.
611 FIXME: not supported. */
626 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
627 FIXME: not supported. */
642 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
643 the symbol. */
658 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
659 the symbol. */
674 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
675 the symbol. */
690 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
691 small data items. */
706 /* 16-bit section relative relocation. */
721 /* 16-bit lower half section relative relocation. */
736 /* 16-bit upper half section relative relocation. */
751 /* 16-bit upper half adjusted section relative relocation. */
766 /* Marker relocs for TLS. */
809 /* Computes the load module index of the load module that contains the
810 definition of its TLS sym. */
825 /* Computes a dtv-relative displacement, the difference between the value
826 of sym+add and the base address of the thread-local storage block that
827 contains the definition of sym, minus 0x8000. */
842 /* A 16 bit dtprel reloc. */
857 /* Like DTPREL16, but no overflow. */
872 /* Like DTPREL16_LO, but next higher group of 16 bits. */
887 /* Like DTPREL16_HI, but adjust for low 16 bits. */
902 /* Computes a tp-relative displacement, the difference between the value of
903 sym+add and the value of the thread pointer (r13). */
918 /* A 16 bit tprel reloc. */
933 /* Like TPREL16, but no overflow. */
948 /* Like TPREL16_LO, but next higher group of 16 bits. */
963 /* Like TPREL16_HI, but adjust for low 16 bits. */
978 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
979 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset
980 to the first entry. */
995 /* Like GOT_TLSGD16, but no overflow. */
1010 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */
1025 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */
1040 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
1041 with values (sym+add)@dtpmod and zero, and computes the offset to the
1042 first entry. */
1057 /* Like GOT_TLSLD16, but no overflow. */
1072 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */
1087 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */
1102 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes
1103 the offset to the entry. */
1118 /* Like GOT_DTPREL16, but no overflow. */
1133 /* Like GOT_DTPREL16_LO, but next higher group of 16 bits. */
1148 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */
1163 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the
1164 offset to the entry. */
1179 /* Like GOT_TPREL16, but no overflow. */
1194 /* Like GOT_TPREL16_LO, but next higher group of 16 bits. */
1209 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */
1224 /* The remaining relocs are from the Embedded ELF ABI, and are not
1225 in the SVR4 ELF ABI. */
1227 /* 32 bit value resulting from the addend minus the symbol. */
1242 /* 16 bit value resulting from the addend minus the symbol. */
1257 /* 16 bit value resulting from the addend minus the symbol. */
1272 /* The high order 16 bits of the addend minus the symbol. */
1287 /* The high order 16 bits of the result of the addend minus the address,
1288 plus 1 if the contents of the low 16 bits, treated as a signed number,
1289 is negative. */
1304 /* 16 bit value resulting from allocating a 4 byte word to hold an
1305 address in the .sdata section, and returning the offset from
1306 _SDA_BASE_ for that relocation. */
1321 /* 16 bit value resulting from allocating a 4 byte word to hold an
1322 address in the .sdata2 section, and returning the offset from
1323 _SDA2_BASE_ for that relocation. */
1338 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
1339 small data items. */
1354 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
1355 signed offset from the appropriate base, and filling in the register
1356 field with the appropriate register (0, 2, or 13). */
1371 /* Relocation not handled: R_PPC_EMB_MRKREF */
1372 /* Relocation not handled: R_PPC_EMB_RELSEC16 */
1373 /* Relocation not handled: R_PPC_EMB_RELST_LO */
1374 /* Relocation not handled: R_PPC_EMB_RELST_HI */
1375 /* Relocation not handled: R_PPC_EMB_RELST_HA */
1376 /* Relocation not handled: R_PPC_EMB_BIT_FLD */
1378 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
1379 in the 16 bit signed offset from the appropriate base, and filling in the
1380 register field with the appropriate register (0, 2, or 13). */
1409 /* A 16 bit relative relocation. */
1424 /* A 16 bit relative relocation without overflow. */
1439 /* The high order 16 bits of a relative address. */
1454 /* The high order 16 bits of a relative address, plus 1 if the contents of
1455 the low 16 bits, treated as a signed number, is negative. */
1470 /* GNU extension to record C++ vtable hierarchy. */
1485 /* GNU extension to record C++ vtable member usage. */
1500 /* Phony reloc to handle AIX style TOC entries. */
1514 };
1515 \f
1516 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
1518 static void
1520 {
1525 i++)
1526 {
1532 }
1533 }
1537 bfd_reloc_code_real_type code)
1538 {
1541 /* Initialize howto table if not already done. */
1546 {
1637 }
1640 };
1645 {
1650 i++)
1656 }
1658 /* Set the howto pointer for a PowerPC ELF reloc. */
1660 static void
1664 {
1665 /* Initialize howto table if not already done. */
1672 /* Just because the above assert didn't trigger doesn't mean that
1673 ELF32_R_TYPE (dst->r_info) is necessarily a valid relocation. */
1675 {
1681 }
1682 }
1684 /* Handle the R_PPC_ADDR16_HA and R_PPC_REL16_HA relocs. */
1686 static bfd_reloc_status_type
1694 {
1695 bfd_vma relocation;
1698 {
1701 }
1708 else
1720 }
1722 static bfd_reloc_status_type
1730 {
1731 /* If this is a relocatable link (output_bfd test tells us), just
1732 call the generic function. Any adjustment will be done at final
1733 link time. */
1739 {
1744 }
1746 }
1747 \f
1748 /* Sections created by the linker. */
1751 {
1752 /* Pointer to the bfd section. */
1754 /* Section name. */
1756 /* Associated bss section name. */
1758 /* Associated symbol name. */
1760 /* Associated symbol. */
1764 /* Linked list of allocated pointer entries. This hangs off of the
1765 symbol lists, and provides allows us to return different pointers,
1766 based on different addend's. */
1769 {
1770 /* next allocated pointer for this symbol */
1772 /* offset of pointer from beginning of section */
1773 bfd_vma offset;
1774 /* addend used */
1775 bfd_vma addend;
1776 /* which linker section this is */
1780 struct ppc_elf_obj_tdata
1781 {
1784 /* A mapping from local symbols to offsets into the various linker
1785 sections added. This is index by the symbol index. */
1788 /* Flags used to auto-detect plt type. */
1791 };
1793 #define ppc_elf_tdata(bfd) \
1794 ((struct ppc_elf_obj_tdata *) (bfd)->tdata.any)
1796 #define elf_local_ptr_offsets(bfd) \
1797 (ppc_elf_tdata (bfd)->linker_section_pointers)
1799 #define is_ppc_elf(bfd) \
1800 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
1801 && elf_object_id (bfd) == PPC32_ELF_DATA)
1803 /* Override the generic function because we store some extras. */
1805 static bfd_boolean
1807 {
1809 PPC32_ELF_DATA);
1810 }
1812 /* Fix bad default arch selected for a 32 bit input bfd when the
1813 default is 64 bit. */
1815 static bfd_boolean
1817 {
1819 {
1823 {
1824 /* Relies on arch after 64 bit default being 32 bit default. */
1827 }
1828 }
1830 }
1832 /* Function to set whether a module needs the -mrelocatable bit set. */
1834 static bfd_boolean
1836 {
1843 }
1845 /* Support for core dump NOTE sections. */
1847 static bfd_boolean
1849 {
1854 {
1859 /* pr_cursig */
1862 /* pr_pid */
1865 /* pr_reg */
1870 }
1872 /* Make a ".reg/999" section. */
1875 }
1877 static bfd_boolean
1879 {
1881 {
1892 }
1894 /* Note that for some reason, a spurious space is tacked
1895 onto the end of the args in some (at least one anyway)
1896 implementations, so strip it off if it exists. */
1898 {
1904 }
1907 }
1911 {
1913 {
1918 {
1929 }
1932 {
1951 }
1952 }
1953 }
1955 /* Return address for Ith PLT stub in section PLT, for relocation REL
1956 or (bfd_vma) -1 if it should not be included. */
1958 static bfd_vma
1962 {
1964 }
1966 /* Handle a PowerPC specific section when reading an object file. This
1967 is called when bfd_section_from_shdr finds a section with an unknown
1968 type. */
1970 static bfd_boolean
1975 {
1977 flagword flags;
1992 }
1994 /* Set up any other section flags and such that may be necessary. */
1996 static bfd_boolean
2000 {
2005 }
2007 /* If we have .sbss2 or .PPC.EMB.sbss0 output sections, we
2008 need to bump up the number of section headers. */
2010 static int
2013 {
2026 }
2028 /* Add extra PPC sections -- Note, for now, make .sbss2 and
2029 .PPC.EMB.sbss0 a normal section, and not a bss section so
2030 that the linker doesn't crater when trying to make more than
2031 2 sections. */
2034 {
2045 };
2047 /* This is what we want for new plt/got. */
2053 {
2056 /* See if this is one of the special sections. */
2063 {
2067 }
2070 }
2071 \f
2072 /* Very simple linked list structure for recording apuinfo values. */
2074 {
2077 }
2078 apuinfo_list;
2083 static void
2085 {
2088 }
2090 static void
2092 {
2096 {
2100 }
2109 }
2111 static unsigned
2113 {
2118 entry;
2123 }
2127 {
2133 ;
2136 }
2138 static void
2140 {
2144 {
2148 }
2151 }
2156 /* Scan the input BFDs and create a linked list of
2157 the APUinfo values that will need to be emitted. */
2159 static void
2161 {
2175 /* Read in the input sections contents. */
2177 {
2191 {
2198 }
2202 {
2205 }
2207 /* Verify the contents of the header. Note - we have to
2208 extract the values this way in order to allow for a
2209 host whose endian-ness is different from the target. */
2221 /* Get the number of bytes used for apuinfo entries. */
2226 /* Scan the apuinfo section, building a list of apuinfo numbers. */
2229 }
2234 {
2235 /* Compute the size of the output section. */
2238 /* Set the output section size, if it exists. */
2242 {
2245 }
2246 }
2248 fail:
2254 }
2256 /* Prevent the output section from accumulating the input sections'
2257 contents. We have already stored this in our linked list structure. */
2259 static bfd_boolean
2264 {
2266 }
2268 /* Finally we can generate the output section. */
2270 static void
2272 {
2277 bfd_size_type length;
2292 {
2296 }
2298 /* Create the apuinfo header. */
2307 {
2310 }
2321 }
2322 \f
2323 static bfd_boolean
2325 {
2335 }
2337 static bfd_boolean
2339 {
2344 }
2346 static long
2350 {
2355 bfd_vma stub_vma;
2379 /* Call common code to handle old-style executable PLTs. */
2384 /* If this object was prelinked, the prelinker stored the address
2385 of .glink at got[1]. If it wasn't prelinked, got[1] will be zero. */
2388 {
2402 {
2403 Elf_Internal_Dyn dyn;
2410 {
2418 }
2419 }
2421 }
2423 /* Otherwise we read the first plt entry. */
2425 {
2428 }
2433 /* The .glink section usually does not survive the final
2434 link; search for the section (usually .text) where the
2435 glink stubs now reside. */
2440 /* Determine glink PLT resolver by reading the relative branch
2441 from the first glink stub. */
2444 {
2447 /* The first glink stub may either branch to the resolver ... */
2452 /* ... or fall through a bunch of NOPs. */
2459 {
2462 }
2463 }
2467 /* If the stubs are those for -shared/-pie then we might have
2468 multiple stubs for each plt entry. If that is the case then
2469 there is no way to associate stubs with their plt entries short
2470 of figuring out the GOT pointer value used in the stub. */
2482 {
2486 }
2500 {
2504 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since
2505 we are defining a symbol, ensure one of them is set. */
2517 {
2522 }
2527 }
2529 /* Add a symbol at the start of the glink branch table. */
2538 s++;
2539 count++;
2542 {
2543 /* Add a symbol for the glink PLT resolver. */
2552 s++;
2553 count++;
2554 }
2557 }
2558 \f
2559 /* The following functions are specific to the ELF linker, while
2560 functions above are used generally. They appear in this file more
2561 or less in the order in which they are called. eg.
2562 ppc_elf_check_relocs is called early in the link process,
2563 ppc_elf_finish_dynamic_sections is one of the last functions
2564 called. */
2566 /* Track PLT entries needed for a given symbol. We might need more
2567 than one glink entry per symbol when generating a pic binary. */
2568 struct plt_entry
2569 {
2572 /* -fPIC uses multiple GOT sections, one per file, called ".got2".
2573 This field stores the offset into .got2 used to initialise the
2574 GOT pointer reg. It will always be at least 32768. (Current
2575 gcc always uses an offset of 32768, but ld -r will pack .got2
2576 sections together resulting in larger offsets). */
2577 bfd_vma addend;
2579 /* The .got2 section. */
2582 /* PLT refcount or offset. */
2583 union
2584 {
2585 bfd_signed_vma refcount;
2586 bfd_vma offset;
2589 /* .glink stub offset. */
2590 bfd_vma glink_offset;
2591 };
2593 /* Of those relocs that might be copied as dynamic relocs, this function
2594 selects those that must be copied when linking a shared library,
2595 even when the symbol is local. */
2597 static int
2600 {
2602 {
2619 }
2620 }
2622 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
2623 copying dynamic variables from a shared lib into an app's dynbss
2624 section, and instead use a dynamic relocation to point into the
2625 shared lib. */
2626 #define ELIMINATE_COPY_RELOCS 1
2628 /* PPC ELF linker hash entry. */
2630 struct ppc_elf_link_hash_entry
2631 {
2634 /* If this symbol is used in the linker created sections, the processor
2635 specific backend uses this field to map the field into the offset
2636 from the beginning of the section. */
2639 /* Track dynamic relocs copied for this symbol. */
2642 /* Contexts in which symbol is used in the GOT (or TOC).
2643 TLS_GD .. TLS_TLS bits are or'd into the mask as the
2644 corresponding relocs are encountered during check_relocs.
2645 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
2646 indicate the corresponding GOT entry type is not needed. */
2656 /* Nonzero if we have seen a small data relocation referring to this
2657 symbol. */
2659 };
2661 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent))
2663 /* PPC ELF linker hash table. */
2665 struct ppc_elf_link_hash_table
2666 {
2669 /* Short-cuts to get to dynamic linker sections. */
2685 /* The (unloaded but important) .rela.plt.unloaded on VxWorks. */
2688 /* The .got.plt section (VxWorks only)*/
2691 /* Shortcut to __tls_get_addr. */
2694 /* The bfd that forced an old-style PLT. */
2697 /* TLS local dynamic got entry handling. */
2699 bfd_signed_vma refcount;
2700 bfd_vma offset;
2703 /* Offset of branch table to PltResolve function in glink. */
2704 bfd_vma glink_pltresolve;
2706 /* Size of reserved GOT entries. */
2708 /* Non-zero if allocating the header left a gap. */
2711 /* The type of PLT we have chosen to use. */
2714 /* Set if we should emit symbols for stubs. */
2717 /* Set if __tls_get_addr optimization should not be done. */
2720 /* True if the target system is VxWorks. */
2723 /* The size of PLT entries. */
2725 /* The distance between adjacent PLT slots. */
2727 /* The size of the first PLT entry. */
2730 /* Small local sym cache. */
2732 };
2734 /* Rename some of the generic section flags to better document how they
2735 are used here. */
2737 /* Nonzero if this section has TLS related relocations. */
2738 #define has_tls_reloc sec_flg0
2740 /* Nonzero if this section has a call to __tls_get_addr. */
2741 #define has_tls_get_addr_call sec_flg1
2743 /* Get the PPC ELF linker hash table from a link_info structure. */
2745 #define ppc_elf_hash_table(p) \
2746 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
2747 == PPC32_ELF_DATA ? ((struct ppc_elf_link_hash_table *) ((p)->hash)) : NULL)
2749 /* Create an entry in a PPC ELF linker hash table. */
2755 {
2756 /* Allocate the structure if it has not already been allocated by a
2757 subclass. */
2759 {
2764 }
2766 /* Call the allocation method of the superclass. */
2769 {
2774 }
2777 }
2779 /* Create a PPC ELF linker hash table. */
2783 {
2791 ppc_elf_link_hash_newfunc,
2793 PPC32_ELF_DATA))
2794 {
2797 }
2817 }
2819 /* Create .got and the related sections. */
2821 static bfd_boolean
2823 {
2826 flagword flags;
2837 {
2841 }
2842 else
2843 {
2844 /* The powerpc .got has a blrl instruction in it. Mark it
2845 executable. */
2850 }
2857 }
2859 static bfd_boolean
2861 {
2864 flagword flags;
2875 {
2883 }
2900 }
2902 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2903 to output sections (just like _bfd_elf_create_dynamic_sections has
2904 to create .dynbss and .rela.bss). */
2906 static bfd_boolean
2908 {
2911 flagword flags;
2934 {
2943 }
2956 /* The VxWorks PLT is a loaded section with contents. */
2959 }
2961 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2963 static void
2967 {
2976 /* If called to transfer flags for a weakdef during processing
2977 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
2978 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
2990 /* If we were called to copy over info for a weak sym, that's all. */
2995 {
2997 {
3001 /* Add reloc counts against the indirect sym to the direct sym
3002 list. Merge any entries against the same section. */
3004 {
3009 {
3014 }
3017 }
3019 }
3023 }
3025 /* Copy over the GOT refcount entries that we may have already seen to
3026 the symbol which just became indirect. */
3030 /* And plt entries. */
3032 {
3034 {
3039 {
3044 {
3048 }
3051 }
3053 }
3057 }
3060 {
3068 }
3069 }
3071 /* Hook called by the linker routine which adds symbols from an object
3072 file. We use it to put .comm items in .sbss, and not .bss. */
3074 static bfd_boolean
3082 {
3087 {
3088 /* Common symbols less than or equal to -G nn bytes are automatically
3089 put into .sbss. */
3094 {
3102 flags);
3105 }
3109 }
3117 }
3118 \f
3119 static bfd_boolean
3121 {
3133 }
3135 /* Create a special linker section. */
3137 static bfd_boolean
3140 flagword flags,
3142 {
3149 /* Record the first bfd that needs the special sections. */
3155 flags);
3162 }
3164 /* Find a linker generated pointer with a given addend and type. */
3167 elf_find_pointer_linker_section
3169 bfd_vma addend,
3171 {
3177 }
3179 /* Allocate a pointer to live in a linker created section. */
3181 static bfd_boolean
3186 {
3190 bfd_size_type amt;
3194 /* Is this a global symbol? */
3196 {
3199 /* Has this symbol already been allocated? If so, our work is done. */
3203 lsect))
3207 }
3208 else
3209 {
3212 /* Allocation of a pointer to a local symbol. */
3215 /* Allocate a table to hold the local symbols if first time. */
3217 {
3228 }
3230 /* Has this symbol already been allocated? If so, our work is done. */
3233 lsect))
3237 }
3239 /* Allocate space for a pointer in the linker section, and allocate
3240 a new pointer record from internal memory. */
3256 #ifdef DEBUG
3261 #endif
3264 }
3271 {
3277 {
3287 }
3295 }
3297 static bfd_boolean
3300 {
3309 {
3319 }
3322 }
3326 {
3335 }
3337 static bfd_boolean
3339 {
3350 }
3352 static void
3354 {
3357 abfd,
3360 }
3362 /* Look through the relocs for a section during the first phase, and
3363 allocate space in the global offset table or procedure linkage
3364 table. */
3366 static bfd_boolean
3371 {
3383 /* Don't do anything special with non-loaded, non-alloced sections.
3384 In particular, any relocs in such sections should not affect GOT
3385 and PLT reference counting (ie. we don't allow them to create GOT
3386 or PLT entries), there's no possibility or desire to optimize TLS
3387 relocs, and there's not much point in propagating relocs to shared
3388 libs that the dynamic linker won't relocate. */
3392 #ifdef DEBUG
3395 #endif
3399 /* Initialize howto table if not already done. */
3405 {
3410 }
3420 {
3429 else
3430 {
3435 }
3437 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
3438 This shows up in particular in an R_PPC_ADDR32 in the eabi
3439 startup code. */
3443 {
3449 }
3454 {
3463 {
3465 bfd_vma addend;
3468 PLT_IFUNC);
3472 /* STT_GNU_IFUNC symbols must have a PLT entry;
3473 In a non-pie executable even when there are
3474 no plt calls. */
3477 {
3481 }
3484 }
3485 }
3491 {
3495 /* We have a new-style __tls_get_addr call with a marker
3496 reloc. */
3497 ;
3498 else
3499 /* Mark this section as having an old-style call. */
3501 }
3504 {
3507 /* These special tls relocs tie a call to __tls_get_addr with
3508 its parameter symbol. */
3539 dogottls:
3541 /* Fall thru */
3543 /* GOT16 relocations */
3548 /* This symbol requires a global offset table entry. */
3550 {
3555 }
3557 {
3560 }
3561 else
3562 /* This is a global offset table entry for a local symbol. */
3566 /* We may also need a plt entry if the symbol turns out to be
3567 an ifunc. */
3569 {
3572 }
3575 /* Indirect .sdata relocation. */
3578 {
3581 }
3590 {
3593 }
3596 /* Indirect .sdata2 relocation. */
3599 {
3602 }
3611 {
3614 }
3622 {
3625 }
3630 {
3633 }
3638 {
3641 }
3647 {
3650 }
3658 {
3661 }
3670 {
3673 }
3681 /* Fall through */
3687 #ifdef DEBUG
3689 #endif
3690 /* This symbol requires a procedure linkage table entry. We
3691 actually build the entry in finish_dynamic_symbol,
3692 because this might be a case of linking PIC code without
3693 linking in any dynamic objects, in which case we don't
3694 need to generate a procedure linkage table after all. */
3697 {
3698 /* It does not make sense to have a procedure linkage
3699 table entry for a local symbol. */
3705 }
3706 else
3707 {
3711 {
3715 }
3719 }
3722 /* The following relocations don't need to propagate the
3723 relocation if linking a shared object since they are
3724 section relative. */
3743 /* These are just markers. */
3753 /* These should only appear in dynamic objects. */
3761 /* These aren't handled yet. We'll report an error later. */
3770 /* This refers only to functions defined in the shared library. */
3773 {
3776 }
3779 /* This relocation describes the C++ object vtable hierarchy.
3780 Reconstruct it for later use during GC. */
3786 /* This relocation describes which C++ vtable entries are actually
3787 used. Record for later use during GC. */
3795 /* We shouldn't really be seeing these. */
3805 /* Nor these. */
3816 {
3817 /* Old -fPIC gcc code has .long LCTOC1-LCFx just before
3818 the start of a function, which assembles to a REL32
3819 reference to .got2. If we detect one of these, then
3820 force the old PLT layout because the linker cannot
3821 reliably deduce the GOT pointer value needed for
3822 PLT call stubs. */
3833 {
3836 }
3837 }
3840 /* fall through */
3850 {
3851 /* We may need a plt entry if the symbol turns out to be
3852 a function defined in a dynamic object. */
3856 /* We may need a copy reloc too. */
3859 }
3869 {
3871 {
3874 }
3876 }
3877 /* fall through */
3884 {
3885 /* We may need a plt entry if the symbol turns out to be
3886 a function defined in a dynamic object. */
3891 }
3893 dodyn:
3894 /* If we are creating a shared library, and this is a reloc
3895 against a global symbol, or a non PC relative reloc
3896 against a local symbol, then we need to copy the reloc
3897 into the shared library. However, if we are linking with
3898 -Bsymbolic, we do not need to copy a reloc against a
3899 global symbol which is defined in an object we are
3900 including in the link (i.e., DEF_REGULAR is set). At
3901 this point we have not seen all the input files, so it is
3902 possible that DEF_REGULAR is not set now but will be set
3903 later (it is never cleared). In case of a weak definition,
3904 DEF_REGULAR may be cleared later by a strong definition in
3905 a shared library. We account for that possibility below by
3906 storing information in the dyn_relocs field of the hash
3907 table entry. A similar situation occurs when creating
3908 shared libraries and symbol visibility changes render the
3909 symbol local.
3911 If on the other hand, we are creating an executable, we
3912 may need to keep relocations for symbols satisfied by a
3913 dynamic library if we manage to avoid copy relocs for the
3914 symbol. */
3921 || (ELIMINATE_COPY_RELOCS
3926 {
3930 #ifdef DEBUG
3932 "ppc_elf_check_relocs needs to "
3936 #endif
3938 {
3942 sreloc = _bfd_elf_make_dynamic_reloc_section
3947 }
3949 /* If this is a global symbol, we count the number of
3950 relocations we need for this symbol. */
3952 {
3954 }
3955 else
3956 {
3957 /* Track dynamic relocs needed for local syms too.
3958 We really need local syms available to do this
3959 easily. Oh well. */
3975 }
3979 {
3988 }
3993 }
3996 }
3997 }
4000 }
4001 \f
4003 /* Merge object attributes from IBFD into OBFD. Raise an error if
4004 there are conflicting attributes. */
4005 static bfd_boolean
4007 {
4012 {
4013 /* This is the first object. Copy the attributes. */
4016 /* Use the Tag_null value to indicate the attributes have been
4017 initialized. */
4021 }
4026 /* Check for conflicting Tag_GNU_Power_ABI_FP attributes and merge
4027 non-conflicting ones. */
4031 {
4036 ;
4038 _bfd_error_handler
4041 _bfd_error_handler
4045 _bfd_error_handler
4049 _bfd_error_handler
4053 _bfd_error_handler
4056 _bfd_error_handler
4059 else
4060 _bfd_error_handler
4063 }
4065 /* Check for conflicting Tag_GNU_Power_ABI_Vector attributes and
4066 merge non-conflicting ones. */
4070 {
4074 {
4078 }
4081 {
4085 }
4091 ;
4092 /* For now, allow generic to transition to AltiVec or SPE
4093 without a warning. If GCC marked files with their stack
4094 alignment and used don't-care markings for files which are
4095 not affected by the vector ABI, we could warn about this
4096 case too. */
4100 ;
4102 _bfd_error_handler
4106 _bfd_error_handler
4109 else
4110 _bfd_error_handler
4113 }
4115 /* Check for conflicting Tag_GNU_Power_ABI_Struct_Return attributes
4116 and merge non-conflicting ones. */
4120 {
4125 ;
4127 _bfd_error_handler
4130 _bfd_error_handler
4133 _bfd_error_handler
4136 else
4137 _bfd_error_handler
4140 }
4142 /* Merge Tag_compatibility attributes and any common GNU ones. */
4146 }
4148 /* Merge backend specific data from an object file to the output
4149 object file when linking. */
4151 static bfd_boolean
4153 {
4154 flagword old_flags;
4155 flagword new_flags;
4156 bfd_boolean error;
4161 /* Check if we have the same endianness. */
4171 {
4172 /* First call, no flags set. */
4175 }
4177 /* Compatible flags are ok. */
4179 ;
4181 /* Incompatible flags. */
4182 else
4183 {
4184 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
4185 to be linked with either. */
4189 {
4194 }
4197 {
4202 }
4204 /* The output is -mrelocatable-lib iff both the input files are. */
4208 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
4209 but each input file is either -mrelocatable or -mrelocatable-lib. */
4215 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
4216 any module uses it. */
4222 /* Warn about any other mismatches. */
4224 {
4230 }
4233 {
4236 }
4237 }
4240 }
4241 \f
4242 /* Choose which PLT scheme to use, and set .plt flags appropriately.
4243 Returns -1 on error, 0 for old PLT, 1 for new PLT. */
4244 int
4249 {
4251 flagword flags;
4258 {
4273 {
4274 /* Profiling of shared libs (and pies) is not supported with
4275 secure plt, because ppc32 does profiling before a
4276 function prologue and a secure plt pic call stubs needs
4277 r30 to be set up. */
4279 }
4280 else
4281 {
4285 /* Look through the reloc flags left by ppc_elf_check_relocs.
4286 Use the old style bss plt if a file makes plt calls
4287 without using the new relocs, and if ld isn't given
4288 --secure-plt and we never see REL16 relocs. */
4293 {
4297 {
4301 }
4302 }
4304 }
4305 }
4307 {
4311 else
4313 }
4318 {
4322 /* The new PLT is a loaded section. */
4327 /* The new GOT is not executable. */
4331 }
4332 else
4333 {
4334 /* Stop an unused .glink section from affecting .text alignment. */
4338 }
4340 }
4341 \f
4342 /* Return the section that should be marked against GC for a given
4343 relocation. */
4351 {
4354 {
4358 }
4361 }
4363 /* Update the got, plt and dynamic reloc reference counts for the
4364 section being removed. */
4366 static bfd_boolean
4371 {
4395 {
4402 {
4414 {
4415 /* Everything must go for SEC. */
4418 }
4419 }
4427 {
4433 {
4444 }
4445 }
4448 {
4470 {
4474 {
4480 }
4481 }
4483 {
4486 }
4496 /* Fall thru */
4519 {
4528 }
4533 }
4534 }
4536 }
4537 \f
4538 /* Set plt output section type, htab->tls_get_addr, and call the
4539 generic ELF tls_setup function. */
4541 asection *
4545 {
4552 {
4559 {
4560 /* If glibc supports an optimized __tls_get_addr call stub,
4561 signalled by the presence of __tls_get_addr_opt, and we'll
4562 be calling __tls_get_addr via a plt call stub, then
4563 make __tls_get_addr point to __tls_get_addr_opt. */
4572 {
4578 {
4583 {
4584 /* Use __tls_get_addr_opt in dynamic relocations. */
4590 }
4592 }
4593 }
4594 }
4595 else
4597 }
4602 {
4605 }
4608 }
4610 /* Return TRUE iff REL is a branch reloc with a global symbol matching
4611 HASH. */
4613 static bfd_boolean
4617 {
4623 {
4633 }
4635 }
4637 /* Run through all the TLS relocs looking for optimization
4638 opportunities. */
4640 bfd_boolean
4643 {
4656 /* Make two passes through the relocs. First time check that tls
4657 relocs involved in setting up a tls_get_addr call are indeed
4658 followed by such a call. If they are not, don't do any tls
4659 optimization. On the second pass twiddle tls_mask flags to
4660 notify relocate_section that optimization can be done, and
4661 adjust got and plt refcounts. */
4664 {
4671 {
4675 /* Read the relocations. */
4683 {
4689 bfd_boolean is_local;
4694 {
4702 }
4710 /* If this section has old-style __tls_get_addr calls
4711 without marker relocs, then check that each
4712 __tls_get_addr call reloc is preceded by a reloc
4713 that conceivably belongs to the __tls_get_addr arg
4714 setup insn. If we don't find matching arg setup
4715 relocs, don't do any tls optimization. */
4720 && !expecting_tls_get_addr
4722 {
4729 }
4733 {
4737 /* Fall thru */
4741 /* These relocs should never be against a symbol
4742 defined in a shared lib. Leave them alone if
4743 that turns out to be the case. */
4747 /* LD -> LE */
4755 /* Fall thru */
4760 /* GD -> LE */
4762 else
4763 /* GD -> IE */
4773 {
4774 /* IE -> LE */
4778 }
4779 else
4791 }
4794 {
4805 /* Uh oh, we didn't find the expected call. We
4806 could just mark this symbol to exclude it
4807 from tls optimization but it's safer to skip
4808 the entire optimization. */
4815 }
4818 {
4832 }
4835 {
4838 }
4839 else
4840 {
4846 {
4853 {
4857 }
4858 }
4867 }
4870 {
4871 /* We managed to get rid of a got entry. */
4874 }
4878 }
4882 }
4886 {
4889 else
4891 }
4892 }
4894 }
4895 \f
4896 /* Return true if we have dynamic relocs that apply to read-only sections. */
4898 static bfd_boolean
4900 {
4904 {
4911 }
4913 }
4915 /* Adjust a symbol defined by a dynamic object and referenced by a
4916 regular object. The current definition is in some section of the
4917 dynamic object, but we're not including those sections. We have to
4918 change the definition to something the rest of the link can
4919 understand. */
4921 static bfd_boolean
4924 {
4928 #ifdef DEBUG
4931 #endif
4933 /* Make sure we know what is going on here. */
4943 /* Deal with function syms. */
4947 {
4948 /* Clear procedure linkage table information for any symbol that
4949 won't need a .plt entry. */
4959 {
4960 /* A PLT entry is not required/allowed when:
4962 1. We are not using ld.so; because then the PLT entry
4963 can't be set up, so we can't use one. In this case,
4964 ppc_elf_adjust_dynamic_symbol won't even be called.
4966 2. GC has rendered the entry unused.
4968 3. We know for certain that a call to this symbol
4969 will go to this object, or will remain undefined. */
4972 }
4973 else
4974 {
4975 /* After adjust_dynamic_symbol, non_got_ref set in the
4976 non-shared case means that we have allocated space in
4977 .dynbss for the symbol and thus dyn_relocs for this
4978 symbol should be discarded.
4979 If we get here we know we are making a PLT entry for this
4980 symbol, and in an executable we'd normally resolve
4981 relocations against this symbol to the PLT entry. Allow
4982 dynamic relocs if the reference is weak, and the dynamic
4983 relocs will not cause text relocation. */
4991 }
4993 }
4994 else
4997 /* If this is a weak symbol, and there is a real definition, the
4998 processor independent code will have arranged for us to see the
4999 real definition first, and we can just use the same value. */
5001 {
5009 }
5011 /* This is a reference to a symbol defined by a dynamic object which
5012 is not a function. */
5014 /* If we are creating a shared library, we must presume that the
5015 only references to the symbol are via the global offset table.
5016 For such cases we need not do anything here; the relocations will
5017 be handled correctly by relocate_section. */
5021 /* If there are no references to this symbol that do not use the
5022 GOT, we don't need to generate a copy reloc. */
5026 /* If we didn't find any dynamic relocs in read-only sections, then
5027 we'll be keeping the dynamic relocs and avoiding the copy reloc.
5028 We can't do this if there are any small data relocations. This
5029 doesn't work on VxWorks, where we can not have dynamic
5030 relocations (other than copy and jump slot relocations) in an
5031 executable. */
5037 {
5040 }
5043 {
5047 }
5049 /* We must allocate the symbol in our .dynbss section, which will
5050 become part of the .bss section of the executable. There will be
5051 an entry for this symbol in the .dynsym section. The dynamic
5052 object will contain position independent code, so all references
5053 from the dynamic object to this symbol will go through the global
5054 offset table. The dynamic linker will use the .dynsym entry to
5055 determine the address it must put in the global offset table, so
5056 both the dynamic object and the regular object will refer to the
5057 same memory location for the variable.
5059 Of course, if the symbol is referenced using SDAREL relocs, we
5060 must instead allocate it in .sbss. */
5064 else
5068 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
5069 copy the initial value out of the dynamic object and into the
5070 runtime process image. We need to remember the offset into the
5071 .rela.bss section we are going to use. */
5073 {
5078 else
5083 }
5086 }
5087 \f
5088 /* Generate a symbol to mark plt call stubs. For non-PIC code the sym is
5089 xxxxxxxx.plt_call32.<callee> where xxxxxxxx is a hex number, usually 0,
5090 specifying the addend on the plt relocation. For -fpic code, the sym
5091 is xxxxxxxx.plt_pic32.<callee>, and for -fPIC
5092 xxxxxxxx.got2.plt_pic32.<callee>. */
5094 static bfd_boolean
5098 {
5107 else
5127 {
5136 }
5138 }
5140 /* Allocate NEED contiguous space in .got, and return the offset.
5141 Handles allocation of the got header when crossing 32k. */
5143 static bfd_vma
5145 {
5146 bfd_vma where;
5150 {
5153 }
5154 else
5155 {
5158 {
5161 }
5162 else
5163 {
5166 {
5169 }
5172 }
5173 }
5175 }
5177 /* Allocate space in associated reloc sections for dynamic relocs. */
5179 static bfd_boolean
5181 {
5193 {
5197 bfd_boolean dyn;
5201 {
5202 /* Make sure this symbol is output as a dynamic symbol. */
5207 {
5210 }
5216 {
5222 {
5224 {
5227 }
5232 {
5238 }
5243 {
5246 }
5252 }
5253 else
5254 {
5256 {
5257 /* If this is the first .plt entry, make room
5258 for the special first entry. */
5262 /* The PowerPC PLT is actually composed of two
5263 parts, the first part is 2 words (for a load
5264 and a jump), and then there is a remaining
5265 word available at the end. */
5272 /* If this symbol is not defined in a regular
5273 file, and we are not generating a shared
5274 library, then set the symbol to this location
5275 in the .plt. This is to avoid text
5276 relocations, and is required to make
5277 function pointers compare as equal between
5278 the normal executable and the shared library. */
5282 {
5285 }
5287 /* Make room for this entry. */
5289 /* After the 8192nd entry, room for two entries
5290 is allocated. */
5296 }
5298 }
5300 /* We also need to make an entry in the .rela.plt section. */
5302 {
5306 else
5307 {
5311 {
5312 /* Allocate space for the unloaded relocations. */
5315 {
5318 {
5322 }
5327 }
5329 /* Every PLT entry has an associated GOT entry in
5330 .got.plt. */
5332 }
5333 }
5335 }
5336 }
5337 else
5339 }
5340 else
5344 {
5347 }
5348 }
5349 else
5350 {
5353 }
5357 {
5358 bfd_boolean dyn;
5361 /* Make sure this symbol is output as a dynamic symbol. */
5366 {
5369 }
5373 {
5375 {
5377 /* We'll just use htab->tlsld_got.offset. This should
5378 always be the case. It's a little odd if we have
5379 a local dynamic reloc against a non-local symbol. */
5381 else
5383 }
5390 }
5391 else
5395 else
5396 {
5403 {
5405 /* All the entries we allocated need relocs.
5406 Except LD only needs one. */
5411 }
5412 }
5413 }
5414 else
5421 /* In the shared -Bsymbolic case, discard space allocated for
5422 dynamic pc-relative relocs against symbols which turn out to be
5423 defined in regular objects. For the normal shared case, discard
5424 space for relocs that have become local due to symbol visibility
5425 changes. */
5428 {
5429 /* Relocs that use pc_count are those that appear on a call insn,
5430 or certain REL relocs (see must_be_dyn_reloc) that can be
5431 generated via assembly. We want calls to protected symbols to
5432 resolve directly to the function rather than going via the plt.
5433 If people want function pointer comparisons to work as expected
5434 then they should avoid writing weird assembly. */
5436 {
5440 {
5445 else
5447 }
5448 }
5451 {
5455 {
5458 else
5460 }
5461 }
5463 /* Discard relocs on undefined symbols that must be local. */
5470 /* Also discard relocs on undefined weak syms with non-default
5471 visibility. */
5474 {
5478 /* Make sure undefined weak symbols are output as a dynamic
5479 symbol in PIEs. */
5483 {
5486 }
5487 }
5488 }
5490 {
5491 /* For the non-shared case, discard space for relocs against
5492 symbols which turn out to need copy relocs or are not
5493 dynamic. */
5497 {
5498 /* Make sure this symbol is output as a dynamic symbol.
5499 Undefined weak syms won't yet be marked as dynamic. */
5502 {
5505 }
5507 /* If that succeeded, we know we'll be keeping all the
5508 relocs. */
5511 }
5515 keep: ;
5516 }
5518 /* Finally, allocate space. */
5520 {
5525 }
5528 }
5530 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
5531 read-only sections. */
5533 static bfd_boolean
5535 {
5540 {
5543 /* Not an error, just cut short the traversal. */
5545 }
5547 }
5550 {
5561 };
5563 /* Set the sizes of the dynamic sections. */
5565 static bfd_boolean
5568 {
5571 bfd_boolean relocs;
5574 #ifdef DEBUG
5576 #endif
5582 {
5583 /* Set the contents of the .interp section to the interpreter. */
5585 {
5590 }
5591 }
5598 /* Set up .got offsets for local syms, and space for local dynamic
5599 relocs. */
5601 {
5607 bfd_size_type locsymcount;
5614 {
5621 {
5624 {
5625 /* Input section has been discarded, either because
5626 it is a copy of a linkonce section or due to
5627 linker script /DISCARD/, so we'll be discarding
5628 the relocs too. */
5629 }
5633 {
5634 /* Relocations in vxworks .tls_vars sections are
5635 handled specially by the loader. */
5636 }
5638 {
5647 }
5648 }
5649 }
5664 {
5667 {
5676 }
5677 else
5681 else
5682 {
5687 }
5688 }
5689 else
5695 /* Allocate space for calls to local STT_GNU_IFUNC syms in .iplt. */
5697 {
5704 {
5708 {
5711 }
5716 {
5719 }
5723 {
5726 }
5727 }
5728 else
5730 }
5731 }
5733 /* Allocate space for global sym dynamic relocs. */
5737 {
5741 }
5742 else
5746 {
5749 /* If we haven't allocated the header, do so now. When we get here,
5750 for old plt/got the got size will be 0 to 32764 (not allocated),
5751 or 32780 to 65536 (header allocated). For new plt/got, the
5752 corresponding ranges are 0 to 32768 and 32780 to 65536. */
5754 {
5759 }
5762 }
5764 {
5769 {
5773 }
5774 }
5779 {
5781 /* Space for the branch table. */
5783 /* Pad out to align the start of PLTresolve. */
5788 {
5795 {
5804 }
5810 {
5819 }
5820 }
5821 }
5827 {
5831 {
5835 }
5836 }
5838 /* We've now determined the sizes of the various dynamic sections.
5839 Allocate memory for them. */
5842 {
5850 {
5851 /* We'd like to strip these sections if they aren't needed, but if
5852 we've exported dynamic symbols from them we must leave them.
5853 It's too late to tell BFD to get rid of the symbols. */
5856 /* Strip this section if we don't need it; see the
5857 comment below. */
5858 }
5868 {
5869 /* Strip these too. */
5870 }
5872 {
5874 {
5875 /* Remember whether there are any relocation sections. */
5878 /* We use the reloc_count field as a counter if we need
5879 to copy relocs into the output file. */
5881 }
5882 }
5883 else
5884 {
5885 /* It's not one of our sections, so don't allocate space. */
5887 }
5890 {
5891 /* If we don't need this section, strip it from the
5892 output file. This is mostly to handle .rela.bss and
5893 .rela.plt. We must create both sections in
5894 create_dynamic_sections, because they must be created
5895 before the linker maps input sections to output
5896 sections. The linker does that before
5897 adjust_dynamic_symbol is called, and it is that
5898 function which decides whether anything needs to go
5899 into these sections. */
5902 }
5907 /* Allocate memory for the section contents. */
5911 }
5914 {
5915 /* Add some entries to the .dynamic section. We fill in the
5916 values later, in ppc_elf_finish_dynamic_sections, but we
5917 must add the entries now so that we get the correct size for
5918 the .dynamic section. The DT_DEBUG entry is filled in by the
5919 dynamic linker and used by the debugger. */
5920 #define add_dynamic_entry(TAG, VAL) \
5921 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
5924 {
5927 }
5930 {
5936 }
5939 {
5947 }
5950 {
5955 }
5957 /* If any dynamic relocs apply to a read-only section, then we
5958 need a DT_TEXTREL entry. */
5961 info);
5964 {
5967 }
5971 }
5972 #undef add_dynamic_entry
5975 }
5977 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5979 static bfd_boolean
5981 {
5989 }
5990 \f
5991 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
5993 /* Relaxation trampolines. r12 is available for clobbering (r11, is
5994 used for some functions that are allowed to break the ABI). */
5996 {
6005 };
6008 {
6013 };
6015 static bfd_boolean
6020 {
6021 struct one_fixup
6022 {
6025 /* Final link, can use the symbol offset. For a
6026 relocatable link we use the symbol's index. */
6027 bfd_vma toff;
6028 bfd_vma trampoff;
6029 };
6039 bfd_size_type trampoff;
6041 bfd_boolean maybe_pasted;
6045 /* Nothing to do if there are no relocations, and no need to do
6046 anything with non-alloc or non-code sections. */
6053 /* We cannot represent the required PIC relocs in the output, so don't
6054 do anything. The linker doesn't support mixing -shared and -r
6055 anyway. */
6062 /* Space for a branch around any trampolines. */
6068 /* Get a copy of the native relocations. */
6079 {
6093 {
6108 }
6110 /* Get the value of the symbol referred to by the reloc. */
6113 {
6114 /* A local symbol. */
6117 /* Read this BFD's local symbols. */
6119 {
6127 }
6135 else
6140 }
6141 else
6142 {
6143 /* Global symbol handling. */
6155 {
6158 }
6161 {
6164 }
6165 else
6169 }
6171 /* The condition here under which we call find_plt_ent must
6172 match that in relocate_section. If we call find_plt_ent here
6173 but not in relocate_section, or vice versa, then the branch
6174 destination used here may be incorrect. */
6177 {
6178 /* We know is_branch_reloc (r_type) is true. */
6182 }
6185 {
6190 }
6192 {
6200 {
6205 {
6208 }
6209 else
6210 {
6213 }
6214 }
6215 }
6217 /* If the branch and target are in the same section, you have
6218 no hope of adding stubs. We'll error out later should the
6219 branch overflow. */
6223 /* There probably isn't any reason to handle symbols in
6224 SEC_MERGE sections; SEC_MERGE doesn't seem a likely
6225 attribute for a code section, and we are only looking at
6226 branches. However, implement it correctly here as a
6227 reference for other target relax_section functions. */
6229 {
6230 /* At this stage in linking, no SEC_MERGE symbol has been
6231 adjusted, so all references to such symbols need to be
6232 passed through _bfd_merged_section_offset. (Later, in
6233 relocate_section, all SEC_MERGE symbols *except* for
6234 section symbols have been adjusted.)
6236 gas may reduce relocations against symbols in SEC_MERGE
6237 sections to a relocation against the section symbol when
6238 the original addend was zero. When the reloc is against
6239 a section symbol we should include the addend in the
6240 offset passed to _bfd_merged_section_offset, since the
6241 location of interest is the original symbol. On the
6242 other hand, an access to "sym+addend" where "sym" is not
6243 a section symbol should not include the addend; Such an
6244 access is presumed to be an offset from "sym"; The
6245 location of interest is just "sym". */
6251 toff);
6255 }
6256 /* PLTREL24 addends are special. */
6260 /* Attempted -shared link of non-pic code loses. */
6266 /* If the branch is in range, no need to do anything. */
6269 /* A relocatable link may have sections moved during
6270 final link, so do not presume they remain in range. */
6272 {
6279 }
6281 /* Look for an existing fixup to this address. */
6287 {
6293 /* Oh dear, we can't reach a trampoline. Don't try to add
6294 one. We'll report an error later. */
6298 {
6301 }
6302 else
6303 {
6306 }
6310 {
6314 }
6316 /* Hijack the old relocation. Since we need two
6317 relocations for this use a "composite" reloc. */
6319 stub_rtype);
6325 /* Record the fixup so we don't do it again this section. */
6334 changes++;
6335 }
6336 else
6337 {
6342 /* Nop out the reloc, since we're finalizing things here. */
6344 }
6346 /* Get the section contents. */
6348 {
6349 /* Get cached copy if it exists. */
6352 else
6353 {
6354 /* Go get them off disk. */
6357 }
6358 }
6360 /* Fix up the existing branch to hit the trampoline. */
6363 {
6381 }
6382 }
6384 /* Write out the trampolines. */
6386 {
6391 do
6392 {
6396 }
6405 /* Branch around the trampolines. */
6407 {
6411 }
6415 {
6418 }
6419 else
6420 {
6423 }
6427 {
6429 i++;
6433 }
6435 }
6439 {
6442 else
6443 {
6444 /* Cache the symbols for elf_link_input_bfd. */
6446 }
6447 }
6451 {
6454 else
6455 {
6456 /* Cache the section contents for elf_link_input_bfd. */
6458 }
6459 }
6462 {
6463 /* Append sufficient NOP relocs so we can write out relocation
6464 information for the trampolines. */
6475 {
6479 }
6486 }
6492 {
6493 /* Convert the internal relax relocs to external form. */
6496 {
6499 /* Rewrite the reloc and convert one of the trailing nop
6500 relocs to describe this relocation. */
6502 /* The relocs are at the bottom 2 bytes */
6508 irel++;
6509 }
6510 }
6514 error_return:
6524 }
6525 \f
6526 /* What to do when ld finds relocations against symbols defined in
6527 discarded sections. */
6529 static unsigned int
6531 {
6539 }
6540 \f
6541 /* Fill in the address for a pointer generated in a linker section. */
6543 static bfd_vma
6547 bfd_vma relocation,
6549 {
6555 {
6556 /* Handle global symbol. */
6562 }
6563 else
6564 {
6565 /* Handle local symbol. */
6571 }
6575 lsect);
6578 /* Offset will always be a multiple of four, so use the bottom bit
6579 as a "written" flag. */
6581 {
6586 }
6593 #ifdef DEBUG
6597 #endif
6600 }
6602 #define PPC_LO(v) ((v) & 0xffff)
6603 #define PPC_HI(v) (((v) >> 16) & 0xffff)
6604 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
6606 static void
6609 {
6612 bfd_vma plt;
6619 {
6632 {
6641 }
6642 else
6643 {
6652 }
6653 }
6654 else
6655 {
6664 }
6665 }
6667 /* Return true if symbol is defined statically. */
6669 static bfd_boolean
6671 {
6676 }
6678 /* If INSN is an opcode that may be used with an @tls operand, return
6679 the transformed insn for TLS optimisation, otherwise return 0. If
6680 REG is non-zero only match an insn with RB or RA equal to REG. */
6682 unsigned int
6684 {
6694 else
6698 /* add -> addi. */
6704 /* load and store indexed -> dform. */
6707 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
6710 /* lwax -> lwa. */
6712 else
6716 }
6718 /* If INSN is an opcode that may be used with an @tprel operand, return
6719 the transformed insn for an undefined weak symbol, ie. with the
6720 thread pointer REG operand removed. Otherwise return 0. */
6722 unsigned int
6724 {
6745 {
6747 }
6752 {
6757 }
6758 else
6761 }
6763 /* The RELOCATE_SECTION function is called by the ELF backend linker
6764 to handle the relocations for a section.
6766 The relocs are always passed as Rela structures; if the section
6767 actually uses Rel structures, the r_addend field will always be
6768 zero.
6770 This function is responsible for adjust the section contents as
6771 necessary, and (if using Rela relocs and generating a
6772 relocatable output file) adjusting the reloc addend as
6773 necessary.
6775 This function does not have to worry about setting the reloc
6776 address or the reloc symbol index.
6778 LOCAL_SYMS is a pointer to the swapped in local symbols.
6780 LOCAL_SECTIONS is an array giving the section in the input file
6781 corresponding to the st_shndx field of each local symbol.
6783 The global hash table entry for the global symbols can be found
6784 via elf_sym_hashes (input_bfd).
6786 When generating relocatable output, this function must handle
6787 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
6788 going to be the section symbol corresponding to the output
6789 section, which means that the addend must be adjusted
6790 accordingly. */
6792 static bfd_boolean
6801 {
6807 Elf_Internal_Rela outrel;
6812 bfd_boolean is_vxworks_tls;
6814 #ifdef DEBUG
6820 #endif
6824 /* Initialize howto table if not already done. */
6832 /* We have to handle relocations in vxworks .tls_vars sections
6833 specially, because the dynamic loader is 'weird'. */
6840 {
6842 bfd_vma addend;
6843 bfd_reloc_status_type r;
6850 bfd_vma relocation;
6852 bfd_boolean unresolved_reloc;
6853 bfd_boolean warned;
6866 {
6872 }
6873 else
6874 {
6881 }
6884 {
6885 /* For relocs against symbols from removed linkonce sections,
6886 or sections discarded by a linker script, we just want the
6887 section contents zeroed. Avoid any special processing. */
6893 }
6896 {
6900 {
6901 /* R_PPC_PLTREL24 is rather special. If non-zero, the
6902 addend specifies the GOT pointer offset within .got2. */
6904 }
6906 }
6908 /* TLS optimizations. Replace instruction sequences and relocs
6909 based on information we collected in tls_optimize. We edit
6910 RELOCS so that --emit-relocs will output something sensible
6911 for the final instruction stream. */
6917 {
6920 local_plt
6924 }
6926 /* Ensure reloc mapping code below stays sane. */
6937 {
6945 {
6946 bfd_vma insn;
6954 }
6960 {
6961 bfd_vma insn;
6971 /* Was PPC_TLS which sits on insn boundary, now
6972 PPC_TPREL16_LO which is at low-order half-word. */
6974 }
6987 {
6988 tls_gdld_hi:
6992 else
6993 {
6997 }
6999 }
7012 {
7014 bfd_vma offset;
7016 tls_ldgd_opt:
7018 /* If not using the newer R_PPC_TLSGD/LD to mark
7019 __tls_get_addr calls, we must trust that the call
7020 stays with its arg setup insns, ie. that the next
7021 reloc is the __tls_get_addr call associated with
7022 the current reloc. Edit both insns. */
7029 {
7030 /* IE */
7036 {
7040 }
7044 }
7045 else
7046 {
7047 /* LE */
7050 {
7051 /* Was an LD reloc. */
7054 r_symndx++)
7064 }
7068 {
7074 }
7075 }
7079 {
7080 /* We changed the symbol on an LD reloc. Start over
7081 in order to get h, sym, sec etc. right. */
7082 rel--;
7084 }
7085 }
7090 {
7095 {
7096 /* IE */
7099 }
7100 else
7101 {
7102 /* LE */
7106 }
7109 /* Zap the reloc on the _tls_get_addr call too. */
7112 }
7117 {
7122 r_symndx++)
7138 /* Zap the reloc on the _tls_get_addr call too. */
7141 rel--;
7143 }
7145 }
7147 /* Handle other relocations that tweak non-addend part of insn. */
7150 {
7154 /* Branch taken prediction relocations. */
7158 /* Fall thru */
7160 /* Branch not taken prediction relocations. */
7163 {
7164 bfd_vma insn;
7174 /* Invert 'y' bit if not the default. */
7180 }
7181 }
7185 {
7189 {
7192 }
7195 {
7201 }
7207 {
7212 }
7214 {
7216 {
7217 Elf_Internal_Rela rela;
7231 }
7233 {
7238 }
7247 else
7251 }
7252 }
7260 {
7279 /* GOT16 relocations. Like an ADDR16 using the symbol's
7280 address in the GOT as relocation value instead of the
7281 symbol's value itself. Also, create a GOT entry for the
7282 symbol and put the symbol value there. */
7316 dogot:
7317 {
7318 /* Relocation is to the entry for this symbol in the global
7319 offset table. */
7320 bfd_vma off;
7333 {
7334 bfd_boolean dyn;
7339 /* This is actually a static link, or it is a
7340 -Bsymbolic link and the symbol is defined
7341 locally, or the symbol was forced to be local
7342 because of a version file. */
7343 ;
7344 else
7345 {
7348 }
7350 }
7351 else
7352 {
7356 }
7358 /* The offset must always be a multiple of 4. We use the
7359 least significant bit to record whether we have already
7360 processed this entry. */
7364 else
7365 {
7376 /* We might have multiple got entries for this sym.
7377 Initialize them all. */
7378 do
7379 {
7383 {
7386 }
7388 {
7391 }
7393 {
7396 }
7398 {
7401 }
7403 /* Generate relocs for the dynamic linker. */
7409 {
7418 {
7421 {
7428 outrel.r_info
7430 }
7431 }
7440 else
7443 {
7447 }
7452 }
7454 /* Init the .got section contents if we're not
7455 emitting a reloc. */
7456 else
7457 {
7463 {
7469 {
7473 }
7474 }
7477 }
7482 }
7487 }
7493 {
7495 {
7501 {
7505 {
7508 }
7509 }
7510 }
7511 }
7515 + off
7518 /* Addends on got relocations don't make much sense.
7519 x+off@got is actually x@got+off, and since the got is
7520 generated by a hash table traversal, the value in the
7521 got at entry m+n bears little relation to the entry m. */
7527 sym_name);
7528 }
7531 /* Relocations that need no special processing. */
7533 /* It makes no sense to point a local relocation
7534 at a symbol not in this object. */
7536 {
7539 input_bfd,
7540 input_section,
7542 TRUE))
7545 }
7555 /* Relocations that may need to be propagated if this is a shared
7556 object. */
7564 {
7565 /* Make this relocation against an undefined weak symbol
7566 resolve to zero. This is really just a tweak, since
7567 code using weak externs ought to check that they are
7568 defined before using them. */
7575 }
7577 /* The TPREL16 relocs shouldn't really be used in shared
7578 libs as they will result in DT_TEXTREL being set, but
7579 support them anyway. */
7604 /* fall through */
7619 /* If these relocations are not to a named symbol, they can be
7620 handled right here, no need to bother the dynamic linker. */
7624 /* fall through */
7632 /* fall through */
7634 dodyn:
7648 || (ELIMINATE_COPY_RELOCS
7654 {
7657 #ifdef DEBUG
7662 #endif
7664 /* When generating a shared object, these relocations
7665 are copied into the output file to be resolved at run
7666 time. */
7668 {
7674 }
7678 input_section,
7692 {
7696 }
7697 else
7698 {
7702 {
7706 {
7707 /* If we get here when building a static
7708 executable, then the libc startup function
7709 responsible for applying indirect function
7710 relocations is going to complain about
7711 the reloc type.
7712 If we get here when building a dynamic
7713 executable, it will be because we have
7714 a text relocation. The dynamic loader
7715 will set the text segment writable and
7716 non-executable to apply text relocations.
7717 So we'll segfault when trying to run the
7718 indirection function to resolve the reloc. */
7724 sym_name);
7726 }
7728 ;
7730 {
7733 }
7734 else
7735 {
7738 /* We are turning this relocation into one
7739 against a section symbol. It would be
7740 proper to subtract the symbol's value,
7741 osec->vma, from the emitted reloc addend,
7742 but ld.so expects buggy relocs.
7743 FIXME: Why not always use a zero index? */
7747 {
7750 }
7752 #ifdef DEBUG
7757 #endif
7758 }
7761 }
7764 else
7766 }
7775 /* This reloc will be computed at runtime. We clear the memory
7776 so that it contains predictable value. */
7780 {
7784 }
7785 }
7791 {
7796 {
7800 }
7806 else
7810 }
7811 /* Fall thru */
7819 {
7826 /* We're clearing the bits for R_PPC_ADDR16_HA
7827 and R_PPC_ADDR16_LO here. */
7831 /* t0 is HA, t1 is LO */
7839 /* Rewrite the reloc and convert one of the trailing nop
7840 relocs to describe this relocation. */
7842 /* The relocs are at the bottom 2 bytes */
7848 rel++;
7849 }
7852 /* Indirect .sdata relocation. */
7856 {
7859 }
7860 relocation
7866 /* Indirect .sdata2 relocation. */
7870 {
7873 }
7874 relocation
7880 /* Handle the TOC16 reloc. We want to use the offset within the .got
7881 section, not the actual VMA. This is appropriate when generating
7882 an embedded ELF object, for which the .got section acts like the
7883 AIX .toc section. */
7886 {
7889 }
7899 /* Relocation is to the entry for this symbol in the
7900 procedure linkage table. */
7901 {
7907 {
7908 /* We didn't make a PLT entry for this symbol. This
7909 happens when statically linking PIC code, or when
7910 using -Bsymbolic. */
7912 }
7919 else
7923 }
7926 /* Relocate against _SDA_BASE_. */
7928 {
7935 {
7938 }
7946 {
7950 input_bfd,
7951 sym_name,
7953 name);
7954 }
7955 }
7958 /* Relocate against _SDA2_BASE_. */
7960 {
7967 {
7970 }
7976 {
7980 input_bfd,
7981 sym_name,
7983 name);
7984 }
7985 }
7988 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
7991 {
7997 {
8000 }
8007 {
8010 }
8013 {
8016 }
8019 {
8021 }
8022 else
8023 {
8027 input_bfd,
8028 sym_name,
8030 name);
8035 }
8038 {
8040 {
8043 }
8045 }
8048 {
8054 }
8055 }
8058 /* Relocate against the beginning of the section. */
8064 {
8067 }
8071 /* Negative relocations. */
8098 input_bfd,
8100 sym_name);
8105 }
8107 /* Do any further special processing. */
8109 {
8120 /* It's just possible that this symbol is a weak symbol
8121 that's not actually defined anywhere. In that case,
8122 'sec' would be NULL, and we should leave the symbol
8123 alone (it will be set to zero elsewhere in the link). */
8126 /* Fall thru */
8134 /* Add 0x10000 if sign bit in 0:15 is set.
8135 Bits 0:15 are not used. */
8138 }
8140 #ifdef DEBUG
8145 sym_name,
8146 r_symndx,
8149 #endif
8156 {
8161 sym_name);
8163 }
8166 input_bfd,
8167 input_section,
8168 contents,
8170 relocation,
8171 addend);
8174 {
8176 {
8182 {
8183 /* Assume this is a call protected by other code that
8184 detect the symbol is undefined. If this is the case,
8185 we can safely ignore the overflow. If not, the
8186 program is hosed anyway, and a little warning isn't
8187 going to help. */
8190 }
8194 sym_name,
8197 input_bfd,
8198 input_section,
8201 }
8202 else
8203 {
8209 }
8210 }
8211 }
8213 #ifdef DEBUG
8215 #endif
8218 }
8219 \f
8220 /* Finish up dynamic symbol handling. We set the contents of various
8221 dynamic sections here. */
8223 static bfd_boolean
8228 {
8231 bfd_boolean doneone;
8233 #ifdef DEBUG
8236 #endif
8244 {
8246 {
8247 Elf_Internal_Rela rela;
8249 bfd_vma reloc_index;
8255 else
8256 {
8262 }
8264 /* This symbol has an entry in the procedure linkage table.
8265 Set it up. */
8269 {
8270 bfd_vma got_offset;
8273 /* The first three entries in .got.plt are reserved. */
8276 /* Use the right PLT. */
8280 /* Fill in the .plt on VxWorks. */
8282 {
8289 }
8290 else
8291 {
8300 }
8307 /* This instruction is an immediate load. The value loaded is
8308 the byte offset of the R_PPC_JMP_SLOT relocation from the
8309 start of the .rela.plt section. The value is stored in the
8310 low-order 16 bits of the load instruction. */
8311 /* NOTE: It appears that this is now an index rather than a
8312 prescaled offset. */
8316 /* This instruction is a PC-relative branch whose target is
8317 the start of the PLT section. The address of this branch
8318 instruction is 20 bytes beyond the start of this PLT entry.
8319 The address is encoded in bits 6-29, inclusive. The value
8320 stored is right-shifted by two bits, permitting a 26-bit
8321 offset. */
8331 /* Fill in the GOT entry corresponding to this PLT slot with
8332 the address immediately after the the "bctr" instruction
8333 in this PLT entry. */
8340 {
8341 /* Fill in a couple of entries in .rela.plt.unloaded. */
8347 /* Provide the @ha relocation for the first instruction. */
8352 R_PPC_ADDR16_HA);
8357 /* Provide the @l relocation for the second instruction. */
8362 R_PPC_ADDR16_LO);
8367 /* Provide a relocation for the GOT entry corresponding to this
8368 PLT slot. Point it at the middle of the .plt entry. */
8373 R_PPC_ADDR32);
8376 }
8378 /* VxWorks uses non-standard semantics for R_PPC_JMP_SLOT.
8379 In particular, the offset for the relocation is not the
8380 address of the PLT entry for this function, as specified
8381 by the ABI. Instead, the offset is set to the address of
8382 the GOT slot for this function. See EABI 4.4.4.1. */
8387 }
8388 else
8389 {
8401 {
8402 /* We don't need to fill in the .plt. The ppc dynamic
8403 linker will fill it in. */
8404 }
8405 else
8406 {
8412 }
8413 }
8415 /* Fill in the entry in the .rela.plt section. */
8419 {
8426 }
8427 else
8435 else
8441 {
8442 /* Mark the symbol as undefined, rather than as
8443 defined in the .plt section. Leave the value if
8444 there were any relocations where pointer equality
8445 matters (this is a clue for the dynamic linker, to
8446 make function pointer comparisons work between an
8447 application and shared library), otherwise set it
8448 to zero. */
8453 {
8454 /* This breaks function pointer comparisons, but
8455 that is better than breaking tests for a NULL
8456 function pointer. */
8458 }
8459 }
8462 {
8463 /* Set the value of ifunc symbols in a non-pie
8464 executable to the glink entry. This is to avoid
8465 text relocations. We can't do this for ifunc in
8466 allocate_dynrelocs, as we do for normal dynamic
8467 function symbols with plt entries, because we need
8468 to keep the original value around for the ifunc
8469 relocation. */
8475 }
8477 }
8482 {
8492 {
8509 }
8514 /* We only need one non-PIC glink stub. */
8516 }
8517 else
8519 }
8522 {
8524 Elf_Internal_Rela rela;
8527 /* This symbols needs a copy reloc. Set it up. */
8529 #ifdef DEBUG
8531 #endif
8537 else
8546 }
8548 #ifdef DEBUG
8550 #endif
8552 /* Mark some specially defined symbols as absolute. */
8561 }
8562 \f
8563 static enum elf_reloc_type_class
8565 {
8567 {
8578 }
8579 }
8580 \f
8581 /* Finish up the dynamic sections. */
8583 static bfd_boolean
8586 {
8590 bfd_vma got;
8594 #ifdef DEBUG
8596 #endif
8603 else
8611 {
8619 {
8620 Elf_Internal_Dyn dyn;
8626 {
8630 else
8650 {
8654 }
8662 }
8665 }
8666 }
8669 {
8672 {
8677 {
8678 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4
8679 so that a function can easily find the address of
8680 _GLOBAL_OFFSET_TABLE_. */
8684 }
8687 {
8692 }
8693 }
8694 else
8695 {
8702 }
8705 }
8707 /* Fill in the first entry in the VxWorks procedure linkage table. */
8709 {
8710 /* Use the right PLT. */
8712 ? ppc_elf_vxworks_pic_plt0_entry
8716 {
8723 }
8724 else
8725 {
8728 }
8737 {
8738 Elf_Internal_Rela rela;
8743 /* Output the @ha relocation for the first instruction. */
8752 /* Output the @l relocation for the second instruction. */
8761 /* Fix up the remaining relocations. They may have the wrong
8762 symbol index for _G_O_T_ or _P_L_T_ depending on the order
8763 in which symbols were output. */
8765 {
8766 Elf_Internal_Rela rel;
8782 }
8783 }
8784 }
8789 {
8792 bfd_vma res0;
8795 /*
8796 * PIC glink code is the following:
8797 *
8798 * # ith PLT code stub.
8799 * addis 11,30,(plt+(i-1)*4-got)@ha
8800 * lwz 11,(plt+(i-1)*4-got)@l(11)
8801 * mtctr 11
8802 * bctr
8803 *
8804 * # A table of branches, one for each plt entry.
8805 * # The idea is that the plt call stub loads ctr and r11 with these
8806 * # addresses, so (r11 - res_0) gives the plt index * 4.
8807 * res_0: b PLTresolve
8808 * res_1: b PLTresolve
8809 * .
8810 * # Some number of entries towards the end can be nops
8811 * res_n_m3: nop
8812 * res_n_m2: nop
8813 * res_n_m1:
8814 *
8815 * PLTresolve:
8816 * addis 11,11,(1f-res_0)@ha
8817 * mflr 0
8818 * bcl 20,31,1f
8819 * 1: addi 11,11,(1b-res_0)@l
8820 * mflr 12
8821 * mtlr 0
8822 * sub 11,11,12 # r11 = index * 4
8823 * addis 12,12,(got+4-1b)@ha
8824 * lwz 0,(got+4-1b)@l(12) # got[1] address of dl_runtime_resolve
8825 * lwz 12,(got+8-1b)@l(12) # got[2] contains the map address
8826 * mtctr 0
8827 * add 0,11,11
8828 * add 11,0,11 # r11 = index * 12 = reloc offset.
8829 * bctr
8830 */
8832 {
8833 ADDIS_11_11,
8834 MFLR_0,
8835 BCL_20_31,
8836 ADDI_11_11,
8837 MFLR_12,
8838 MTLR_0,
8839 SUB_11_11_12,
8840 ADDIS_12_12,
8841 LWZ_0_12,
8842 LWZ_12_12,
8843 MTCTR_0,
8844 ADD_0_11_11,
8845 ADD_11_0_11,
8846 BCTR,
8847 NOP,
8848 NOP
8849 };
8851 /*
8852 * Non-PIC glink code is a little simpler.
8853 *
8854 * # ith PLT code stub.
8855 * lis 11,(plt+(i-1)*4)@ha
8856 * lwz 11,(plt+(i-1)*4)@l(11)
8857 * mtctr 11
8858 * bctr
8859 *
8860 * The branch table is the same, then comes
8861 *
8862 * PLTresolve:
8863 * lis 12,(got+4)@ha
8864 * addis 11,11,(-res_0)@ha
8865 * lwz 0,(got+4)@l(12) # got[1] address of dl_runtime_resolve
8866 * addi 11,11,(-res_0)@l # r11 = index * 4
8867 * mtctr 0
8868 * add 0,11,11
8869 * lwz 12,(got+8)@l(12) # got[2] contains the map address
8870 * add 11,0,11 # r11 = index * 12 = reloc offset.
8871 * bctr
8872 */
8874 {
8875 LIS_12,
8876 ADDIS_11_11,
8877 LWZ_0_12,
8878 ADDI_11_11,
8879 MTCTR_0,
8880 ADD_0_11_11,
8881 LWZ_12_12,
8882 ADD_11_0_11,
8883 BCTR,
8884 NOP,
8885 NOP,
8886 NOP,
8887 NOP,
8888 NOP,
8889 NOP,
8890 NOP
8891 };
8898 /* Build the branch table, one for each plt entry (less one),
8899 and perhaps some padding. */
8905 {
8908 }
8910 {
8913 }
8919 /* Last comes the PLTresolve stub. */
8921 {
8922 bfd_vma bcl;
8925 {
8928 }
8942 {
8947 }
8948 else
8949 {
8954 }
8955 }
8956 else
8957 {
8959 {
8962 }
8972 {
8977 }
8978 else
8979 {
8984 }
8985 }
8986 }
8990 {
8992 bfd_vma val;
8995 /* CIE length (rewrite in case little-endian). */
8998 /* FDE length. */
9002 /* CIE pointer. */
9006 /* Offset to .glink. */
9014 /* .glink size. */
9017 /* Augmentation. */
9022 {
9027 {
9030 }
9032 {
9036 }
9037 else
9038 {
9042 }
9045 p++;
9049 }
9058 }
9061 }
9062 \f
9063 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
9065 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
9067 #define ELF_ARCH bfd_arch_powerpc
9068 #define ELF_TARGET_ID PPC32_ELF_DATA
9069 #define ELF_MACHINE_CODE EM_PPC
9070 #ifdef __QNXTARGET__
9071 #define ELF_MAXPAGESIZE 0x1000
9072 #else
9073 #define ELF_MAXPAGESIZE 0x10000
9074 #endif
9075 #define ELF_MINPAGESIZE 0x1000
9076 #define ELF_COMMONPAGESIZE 0x1000
9077 #define elf_info_to_howto ppc_elf_info_to_howto
9079 #ifdef EM_CYGNUS_POWERPC
9080 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
9081 #endif
9083 #ifdef EM_PPC_OLD
9084 #define ELF_MACHINE_ALT2 EM_PPC_OLD
9085 #endif
9087 #define elf_backend_plt_not_loaded 1
9088 #define elf_backend_can_gc_sections 1
9089 #define elf_backend_can_refcount 1
9090 #define elf_backend_rela_normal 1
9092 #define bfd_elf32_mkobject ppc_elf_mkobject
9093 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
9094 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
9095 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
9096 #define bfd_elf32_bfd_reloc_name_lookup ppc_elf_reloc_name_lookup
9097 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
9098 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create
9099 #define bfd_elf32_get_synthetic_symtab ppc_elf_get_synthetic_symtab
9101 #define elf_backend_object_p ppc_elf_object_p
9102 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
9103 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
9104 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
9105 #define elf_backend_relocate_section ppc_elf_relocate_section
9106 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
9107 #define elf_backend_check_relocs ppc_elf_check_relocs
9108 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol
9109 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
9110 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
9111 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
9112 #define elf_backend_hash_symbol ppc_elf_hash_symbol
9113 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
9114 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
9115 #define elf_backend_fake_sections ppc_elf_fake_sections
9116 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
9117 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
9118 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
9119 #define elf_backend_write_core_note ppc_elf_write_core_note
9120 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
9121 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing
9122 #define elf_backend_final_write_processing ppc_elf_final_write_processing
9123 #define elf_backend_write_section ppc_elf_write_section
9124 #define elf_backend_get_sec_type_attr ppc_elf_get_sec_type_attr
9125 #define elf_backend_plt_sym_val ppc_elf_plt_sym_val
9126 #define elf_backend_action_discarded ppc_elf_action_discarded
9127 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
9128 #define elf_backend_post_process_headers _bfd_elf_set_osabi
9132 /* VxWorks Target */
9134 #undef TARGET_LITTLE_SYM
9135 #undef TARGET_LITTLE_NAME
9137 #undef TARGET_BIG_SYM
9138 #define TARGET_BIG_SYM bfd_elf32_powerpc_vxworks_vec
9139 #undef TARGET_BIG_NAME
9142 /* VxWorks uses the elf default section flags for .plt. */
9145 {
9153 }
9155 /* Like ppc_elf_link_hash_table_create, but overrides
9156 appropriately for VxWorks. */
9159 {
9164 {
9172 }
9174 }
9176 /* Tweak magic VxWorks symbols as they are loaded. */
9177 static bfd_boolean
9185 {
9187 valp))
9191 }
9193 static void
9195 {
9198 }
9200 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
9201 define it. */
9202 #undef elf_backend_want_plt_sym
9203 #define elf_backend_want_plt_sym 1
9204 #undef elf_backend_want_got_plt
9205 #define elf_backend_want_got_plt 1
9206 #undef elf_backend_got_symbol_offset
9207 #define elf_backend_got_symbol_offset 0
9208 #undef elf_backend_plt_not_loaded
9209 #define elf_backend_plt_not_loaded 0
9210 #undef elf_backend_plt_readonly
9211 #define elf_backend_plt_readonly 1
9212 #undef elf_backend_got_header_size
9213 #define elf_backend_got_header_size 12
9215 #undef bfd_elf32_get_synthetic_symtab
9217 #undef bfd_elf32_bfd_link_hash_table_create
9218 #define bfd_elf32_bfd_link_hash_table_create \
9219 ppc_elf_vxworks_link_hash_table_create
9220 #undef elf_backend_add_symbol_hook
9221 #define elf_backend_add_symbol_hook \
9222 ppc_elf_vxworks_add_symbol_hook
9223 #undef elf_backend_link_output_symbol_hook
9224 #define elf_backend_link_output_symbol_hook \
9225 elf_vxworks_link_output_symbol_hook
9226 #undef elf_backend_final_write_processing
9227 #define elf_backend_final_write_processing \
9228 ppc_elf_vxworks_final_write_processing
9229 #undef elf_backend_get_sec_type_attr
9230 #define elf_backend_get_sec_type_attr \
9231 ppc_elf_vxworks_get_sec_type_attr
9232 #undef elf_backend_emit_relocs
9233 #define elf_backend_emit_relocs \
9234 elf_vxworks_emit_relocs
9236 #undef elf32_bed
9237 #define elf32_bed ppc_elf_vxworks_bed
9238 #undef elf_backend_post_process_headers