| blob | 64c2839f42170043552f794e0c45071511156e77 |
1 /* PowerPC-specific support for 32-bit ELF
2 Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
3 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 2 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., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
23 /* This file is based on a preliminary PowerPC ELF ABI. The
24 information may not match the final PowerPC ELF ABI. It includes
25 suggestions from the in-progress Embedded PowerPC ABI, and that
26 information may also not match. */
36 /* RELA relocations are used here. */
43 static void ppc_elf_copy_indirect_symbol
48 static void ppc_elf_info_to_howto
50 static void ppc_elf_howto_init
52 static int ppc_elf_sort_rela
54 static bfd_boolean ppc_elf_relax_section
56 static bfd_reloc_status_type ppc_elf_addr16_ha_reloc
58 static bfd_reloc_status_type ppc_elf_unhandled_reloc
60 static bfd_boolean ppc_elf_object_p
62 static bfd_boolean ppc_elf_set_private_flags
64 static bfd_boolean ppc_elf_merge_private_bfd_data
66 static int ppc_elf_additional_program_headers
68 static bfd_boolean ppc_elf_modify_segment_map
70 static bfd_boolean ppc_elf_create_got
72 static bfd_boolean ppc_elf_create_dynamic_sections
74 static bfd_boolean ppc_elf_section_from_shdr
76 static bfd_boolean ppc_elf_fake_sections
81 static bfd_boolean update_local_sym_info
83 static void bad_shared_reloc
85 static bfd_boolean ppc_elf_check_relocs
91 static bfd_boolean ppc_elf_gc_sweep_hook
94 static bfd_boolean ppc_elf_adjust_dynamic_symbol
96 static bfd_boolean allocate_dynrelocs
98 static bfd_boolean readonly_dynrelocs
100 static bfd_boolean ppc_elf_size_dynamic_sections
102 static bfd_boolean ppc_elf_relocate_section
105 asection **));
106 static bfd_boolean ppc_elf_add_symbol_hook
109 static bfd_boolean ppc_elf_finish_dynamic_symbol
111 Elf_Internal_Sym *));
112 static bfd_boolean ppc_elf_finish_dynamic_sections
114 static enum elf_reloc_type_class ppc_elf_reloc_type_class
116 static bfd_boolean ppc_elf_grok_prstatus
118 static bfd_boolean ppc_elf_grok_psinfo
121 /* Branch prediction bit for branch taken relocs. */
122 #define BRANCH_PREDICT_BIT 0x200000
123 /* Mask to set RA in memory instructions. */
124 #define RA_REGISTER_MASK 0x001f0000
125 /* Value to shift register by to insert RA. */
126 #define RA_REGISTER_SHIFT 16
128 /* The name of the dynamic interpreter. This is put in the .interp
129 section. */
132 /* The size in bytes of an entry in the procedure linkage table. */
133 #define PLT_ENTRY_SIZE 12
134 /* The initial size of the plt reserved for the dynamic linker. */
135 #define PLT_INITIAL_ENTRY_SIZE 72
136 /* The size of the gap between entries in the PLT. */
137 #define PLT_SLOT_SIZE 8
138 /* The number of single-slot PLT entries (the rest use two slots). */
139 #define PLT_NUM_SINGLE_ENTRIES 8192
141 /* Some nop instructions. */
142 #define NOP 0x60000000
143 #define CROR_151515 0x4def7b82
144 #define CROR_313131 0x4ffffb82
146 /* Offset of tp and dtp pointers from start of TLS block. */
147 #define TP_OFFSET 0x7000
148 #define DTP_OFFSET 0x8000
150 /* Will references to this symbol always reference the symbol
151 in this object? STV_PROTECTED is excluded from the visibility test
152 here so that function pointer comparisons work properly. Since
153 function symbols not defined in an app are set to their .plt entry,
154 it's necessary for shared libs to also reference the .plt even
155 though the symbol is really local to the shared lib. */
156 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
157 ((! INFO->shared \
158 || INFO->symbolic \
159 || H->dynindx == -1 \
160 || ELF_ST_VISIBILITY (H->other) == STV_INTERNAL \
161 || ELF_ST_VISIBILITY (H->other) == STV_HIDDEN) \
162 && (H->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
164 /* Will _calls_ to this symbol always call the version in this object? */
165 #define SYMBOL_CALLS_LOCAL(INFO, H) \
166 ((! INFO->shared \
167 || INFO->symbolic \
168 || H->dynindx == -1 \
169 || ELF_ST_VISIBILITY (H->other) != STV_DEFAULT) \
170 && (H->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
171 \f
172 /* The PPC linker needs to keep track of the number of relocs that it
173 decides to copy as dynamic relocs in check_relocs for each symbol.
174 This is so that it can later discard them if they are found to be
175 unnecessary. We store the information in a field extending the
176 regular ELF linker hash table. */
178 struct ppc_elf_dyn_relocs
179 {
182 /* The input section of the reloc. */
185 /* Total number of relocs copied for the input section. */
186 bfd_size_type count;
188 /* Number of pc-relative relocs copied for the input section. */
189 bfd_size_type pc_count;
190 };
192 /* PPC ELF linker hash entry. */
194 struct ppc_elf_link_hash_entry
195 {
198 /* Track dynamic relocs copied for this symbol. */
201 /* Contexts in which symbol is used in the GOT (or TOC).
202 TLS_GD .. TLS_TLS bits are or'd into the mask as the
203 corresponding relocs are encountered during check_relocs.
204 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
205 indicate the corresponding GOT entry type is not needed. */
213 };
215 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent))
217 /* PPC ELF linker hash table. */
219 struct ppc_elf_link_hash_table
220 {
223 /* Short-cuts to get to dynamic linker sections. */
235 /* Short-cut to first output tls section. */
238 /* Shortcut to .__tls_get_addr. */
241 /* TLS local dynamic got entry handling. */
243 bfd_signed_vma refcount;
244 bfd_vma offset;
247 /* Small local sym to section mapping cache. */
249 };
251 /* Get the PPC ELF linker hash table from a link_info structure. */
253 #define ppc_elf_hash_table(p) \
254 ((struct ppc_elf_link_hash_table *) (p)->hash)
256 /* Create an entry in a PPC ELF linker hash table. */
263 {
264 /* Allocate the structure if it has not already been allocated by a
265 subclass. */
267 {
272 }
274 /* Call the allocation method of the superclass. */
277 {
280 }
283 }
285 /* Create a PPC ELF linker hash table. */
290 {
299 ppc_elf_link_hash_newfunc))
300 {
303 }
321 }
323 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
324 copying dynamic variables from a shared lib into an app's dynbss
325 section, and instead use a dynamic relocation to point into the
326 shared lib. */
327 #define ELIMINATE_COPY_RELOCS 1
329 /* Copy the extra info we tack onto an elf_link_hash_entry. */
331 static void
335 {
342 {
344 {
351 /* Add reloc counts against the weak sym to the strong sym
352 list. Merge any entries against the same section. */
354 {
359 {
364 }
367 }
369 }
373 }
380 /* If called to transfer flags for a weakdef during processing
381 of elf_adjust_dynamic_symbol, don't copy ELF_LINK_NON_GOT_REF.
382 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
385 | ELF_LINK_HASH_REF_REGULAR
387 else
389 }
390 \f
394 /* This reloc does nothing. */
409 /* A standard 32 bit relocation. */
424 /* An absolute 26 bit branch; the lower two bits must be zero.
425 FIXME: we don't check that, we just clear them. */
440 /* A standard 16 bit relocation. */
455 /* A 16 bit relocation without overflow. */
470 /* The high order 16 bits of an address. */
485 /* The high order 16 bits of an address, plus 1 if the contents of
486 the low 16 bits, treated as a signed number, is negative. */
501 /* An absolute 16 bit branch; the lower two bits must be zero.
502 FIXME: we don't check that, we just clear them. */
517 /* An absolute 16 bit branch, for which bit 10 should be set to
518 indicate that the branch is expected to be taken. The lower two
519 bits must be zero. */
534 /* An absolute 16 bit branch, for which bit 10 should be set to
535 indicate that the branch is not expected to be taken. The lower
536 two bits must be zero. */
551 /* A relative 26 bit branch; the lower two bits must be zero. */
566 /* A relative 16 bit branch; the lower two bits must be zero. */
581 /* A relative 16 bit branch. Bit 10 should be set to indicate that
582 the branch is expected to be taken. The lower two bits must be
583 zero. */
598 /* A relative 16 bit branch. Bit 10 should be set to indicate that
599 the branch is not expected to be taken. The lower two bits must
600 be zero. */
615 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the
616 symbol. */
631 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
632 the symbol. */
647 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
648 the symbol. */
663 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
664 the symbol. */
679 /* Like R_PPC_REL24, but referring to the procedure linkage table
680 entry for the symbol. */
695 /* This is used only by the dynamic linker. The symbol should exist
696 both in the object being run and in some shared library. The
697 dynamic linker copies the data addressed by the symbol from the
698 shared library into the object, because the object being
699 run has to have the data at some particular address. */
714 /* Like R_PPC_ADDR32, but used when setting global offset table
715 entries. */
730 /* Marks a procedure linkage table entry for a symbol. */
745 /* Used only by the dynamic linker. When the object is run, this
746 longword is set to the load address of the object, plus the
747 addend. */
762 /* Like R_PPC_REL24, but uses the value of the symbol within the
763 object rather than the final value. Normally used for
764 _GLOBAL_OFFSET_TABLE_. */
779 /* Like R_PPC_ADDR32, but may be unaligned. */
794 /* Like R_PPC_ADDR16, but may be unaligned. */
809 /* 32-bit PC relative */
824 /* 32-bit relocation to the symbol's procedure linkage table.
825 FIXME: not supported. */
840 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
841 FIXME: not supported. */
856 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
857 the symbol. */
872 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
873 the symbol. */
888 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
889 the symbol. */
904 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
905 small data items. */
920 /* 16-bit section relative relocation. */
935 /* 16-bit lower half section relative relocation. */
950 /* 16-bit upper half section relative relocation. */
965 /* 16-bit upper half adjusted section relative relocation. */
980 /* Marker reloc for TLS. */
995 /* Computes the load module index of the load module that contains the
996 definition of its TLS sym. */
1011 /* Computes a dtv-relative displacement, the difference between the value
1012 of sym+add and the base address of the thread-local storage block that
1013 contains the definition of sym, minus 0x8000. */
1028 /* A 16 bit dtprel reloc. */
1043 /* Like DTPREL16, but no overflow. */
1058 /* Like DTPREL16_LO, but next higher group of 16 bits. */
1073 /* Like DTPREL16_HI, but adjust for low 16 bits. */
1088 /* Computes a tp-relative displacement, the difference between the value of
1089 sym+add and the value of the thread pointer (r13). */
1104 /* A 16 bit tprel reloc. */
1119 /* Like TPREL16, but no overflow. */
1134 /* Like TPREL16_LO, but next higher group of 16 bits. */
1149 /* Like TPREL16_HI, but adjust for low 16 bits. */
1164 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
1165 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset
1166 to the first entry. */
1181 /* Like GOT_TLSGD16, but no overflow. */
1196 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */
1211 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */
1226 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
1227 with values (sym+add)@dtpmod and zero, and computes the offset to the
1228 first entry. */
1243 /* Like GOT_TLSLD16, but no overflow. */
1258 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */
1273 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */
1288 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes
1289 the offset to the entry. */
1304 /* Like GOT_DTPREL16, but no overflow. */
1319 /* Like GOT_DTPREL16_LO, but next higher group of 16 bits. */
1334 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */
1349 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the
1350 offset to the entry. */
1365 /* Like GOT_TPREL16, but no overflow. */
1380 /* Like GOT_TPREL16_LO, but next higher group of 16 bits. */
1395 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */
1410 /* The remaining relocs are from the Embedded ELF ABI, and are not
1411 in the SVR4 ELF ABI. */
1413 /* 32 bit value resulting from the addend minus the symbol. */
1428 /* 16 bit value resulting from the addend minus the symbol. */
1443 /* 16 bit value resulting from the addend minus the symbol. */
1458 /* The high order 16 bits of the addend minus the symbol. */
1473 /* The high order 16 bits of the result of the addend minus the address,
1474 plus 1 if the contents of the low 16 bits, treated as a signed number,
1475 is negative. */
1490 /* 16 bit value resulting from allocating a 4 byte word to hold an
1491 address in the .sdata section, and returning the offset from
1492 _SDA_BASE_ for that relocation. */
1507 /* 16 bit value resulting from allocating a 4 byte word to hold an
1508 address in the .sdata2 section, and returning the offset from
1509 _SDA2_BASE_ for that relocation. */
1524 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
1525 small data items. */
1540 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
1541 signed offset from the appropriate base, and filling in the register
1542 field with the appropriate register (0, 2, or 13). */
1557 /* Relocation not handled: R_PPC_EMB_MRKREF */
1558 /* Relocation not handled: R_PPC_EMB_RELSEC16 */
1559 /* Relocation not handled: R_PPC_EMB_RELST_LO */
1560 /* Relocation not handled: R_PPC_EMB_RELST_HI */
1561 /* Relocation not handled: R_PPC_EMB_RELST_HA */
1562 /* Relocation not handled: R_PPC_EMB_BIT_FLD */
1564 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
1565 in the 16 bit signed offset from the appropriate base, and filling in the
1566 register field with the appropriate register (0, 2, or 13). */
1581 /* GNU extension to record C++ vtable hierarchy. */
1596 /* GNU extension to record C++ vtable member usage. */
1611 /* Phony reloc to handle AIX style TOC entries. */
1625 };
1626 \f
1627 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
1629 static void
1631 {
1636 i++)
1637 {
1643 }
1644 }
1645 \f
1646 /* This function handles relaxing for the PPC with option --mpc860c0[=<n>].
1648 The MPC860, revision C0 or earlier contains a bug in the die.
1649 If all of the following conditions are true, the next instruction
1650 to be executed *may* be treated as a no-op.
1651 1/ A forward branch is executed.
1652 2/ The branch is predicted as not taken.
1653 3/ The branch is taken.
1654 4/ The branch is located in the last 5 words of a page.
1655 (The EOP limit is 5 by default but may be specified as any value
1656 from 1-10.)
1658 Our software solution is to detect these problematic branches in a
1659 linker pass and modify them as follows:
1660 1/ Unconditional branches - Since these are always predicted taken,
1661 there is no problem and no action is required.
1662 2/ Conditional backward branches - No problem, no action required.
1663 3/ Conditional forward branches - Ensure that the "inverse prediction
1664 bit" is set (ensure it is predicted taken).
1665 4/ Conditional register branches - Ensure that the "y bit" is set
1666 (ensure it is predicted taken). */
1668 /* Sort sections by address. */
1670 static int
1674 {
1678 /* Sort by offset. */
1680 }
1682 static bfd_boolean
1688 {
1689 #define PAGESIZE 0x1000
1698 /* We never have to do this more than once per input section. */
1701 /* If needed, initialize this section's cooked size. */
1705 /* We're only interested in text sections which overlap the
1706 troublesome area at the end of a page. */
1708 {
1710 bfd_boolean section_modified;
1712 /* Get the section contents. */
1713 /* Get cached copy if it exists. */
1716 else
1717 {
1718 /* Go get them off disk. */
1727 }
1732 {
1734 bfd_size_type amt;
1736 /* Get a copy of the native relocations. */
1737 internal_relocs
1746 /* Setup a faster access method for the reloc info we need. */
1753 {
1760 /* Prologue constants are sometimes present in the ".text"
1761 sections and they can be identified by their associated
1762 relocation. We don't want to process those words and
1763 some others which can also be identified by their
1764 relocations. However, not all conditional branches will
1765 have a relocation so we will only ignore words that
1766 1) have a reloc, and 2) the reloc is not applicable to a
1767 conditional branch. The array rela_comb is built here
1768 for use in the EOP scan loop. */
1770 {
1774 /* We should check the instruction. */
1777 /* The word is not a conditional branch - ignore it. */
1780 }
1781 }
1784 ppc_elf_sort_rela);
1785 }
1787 /* Enumerate each EOP region that overlaps this section. */
1792 /* Increment the start position if this section begins in the
1793 middle of its first EOP region. */
1799 {
1800 /* Check each word in this EOP region. */
1802 {
1803 bfd_vma isec_offset;
1807 /* Don't process this word if there is a relocation for it
1808 and the relocation indicates the word is not a
1809 conditional branch. */
1813 {
1814 bfd_vma r_offset;
1818 {
1821 }
1822 }
1825 /* Check the current word for a problematic conditional
1826 branch. */
1827 #define BO0(insn) ((insn) & 0x02000000)
1828 #define BO2(insn) ((insn) & 0x00800000)
1829 #define BO4(insn) ((insn) & 0x00200000)
1833 {
1834 /* Instruction is BCx */
1836 {
1837 bfd_vma target;
1839 /* This branch is predicted as "normal".
1840 If this is a forward branch, it is problematic. */
1844 /* Convert to abs. */
1847 {
1848 /* Set the prediction bit. */
1851 }
1852 }
1853 }
1855 {
1856 /* Instruction is BCCTRx. */
1858 {
1859 /* This branch is predicted as not-taken.
1860 If this is a forward branch, it is problematic.
1861 Since we can't tell statically if it will branch
1862 forward, always set the prediction bit. */
1865 }
1866 }
1868 {
1869 /* Instruction is BCLRx */
1871 {
1872 /* This branch is predicted as not-taken.
1873 If this is a forward branch, it is problematic.
1874 Since we can't tell statically if it will branch
1875 forward, always set the prediction bit. */
1878 }
1879 }
1880 #undef BO0
1881 #undef BO2
1882 #undef BO4
1884 {
1887 }
1888 }
1889 }
1891 {
1894 }
1895 }
1898 {
1901 }
1904 {
1907 }
1910 {
1913 else
1914 {
1915 /* Cache the section contents for elf_link_input_bfd. */
1917 }
1919 }
1923 error_return:
1931 }
1932 \f
1936 bfd_reloc_code_real_type code;
1937 {
1941 /* Initialize howto table if needed. */
1945 {
2030 }
2033 };
2035 /* Set the howto pointer for a PowerPC ELF reloc. */
2037 static void
2042 {
2044 /* Initialize howto table if needed. */
2049 }
2051 /* Handle the R_PPC_ADDR16_HA reloc. */
2053 static bfd_reloc_status_type
2059 PTR data ATTRIBUTE_UNUSED;
2063 {
2064 bfd_vma relocation;
2067 {
2070 }
2077 else
2087 }
2089 static bfd_reloc_status_type
2095 PTR data;
2099 {
2100 /* If this is a relocatable link (output_bfd test tells us), just
2101 call the generic function. Any adjustment will be done at final
2102 link time. */
2108 {
2113 }
2115 }
2117 /* Fix bad default arch selected for a 32 bit input bfd when the
2118 default is 64 bit. */
2120 static bfd_boolean
2123 {
2125 {
2129 {
2130 /* Relies on arch after 64 bit default being 32 bit default. */
2133 }
2134 }
2136 }
2138 /* Function to set whether a module needs the -mrelocatable bit set. */
2140 static bfd_boolean
2143 flagword flags;
2144 {
2151 }
2153 /* Merge backend specific data from an object file to the output
2154 object file when linking. */
2156 static bfd_boolean
2160 {
2161 flagword old_flags;
2162 flagword new_flags;
2163 bfd_boolean error;
2165 /* Check if we have the same endianess. */
2176 {
2177 /* First call, no flags set. */
2180 }
2182 /* Compatible flags are ok. */
2184 ;
2186 /* Incompatible flags. */
2187 else
2188 {
2189 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
2190 to be linked with either. */
2194 {
2199 }
2202 {
2207 }
2209 /* The output is -mrelocatable-lib iff both the input files are. */
2213 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
2214 but each input file is either -mrelocatable or -mrelocatable-lib. */
2220 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
2221 any module uses it. */
2227 /* Warn about any other mismatches. */
2229 {
2234 }
2237 {
2240 }
2241 }
2244 }
2245 \f
2246 /* Handle a PowerPC specific section when reading an object file. This
2247 is called when elfcode.h finds a section with an unknown type. */
2249 static bfd_boolean
2254 {
2256 flagword flags;
2271 }
2272 \f
2273 /* Set up any other section flags and such that may be necessary. */
2275 static bfd_boolean
2280 {
2288 }
2289 \f
2290 /* Create a special linker section */
2296 {
2300 /* Record the first bfd section that needs the special section. */
2304 /* If this is the first time, create the section. */
2307 {
2308 elf_linker_section_t defaults;
2316 /* Both of these sections are (technically) created by the user
2317 putting data in them, so they shouldn't be marked
2318 SEC_LINKER_CREATED.
2320 The linker creates them so it has somewhere to attach their
2321 respective symbols. In fact, if they were empty it would
2322 be OK to leave the symbol set to 0 (or any random number), because
2323 the appropriate register should never be used. */
2328 {
2353 }
2356 }
2359 }
2360 \f
2361 /* If we have a non-zero sized .sbss2 or .PPC.EMB.sbss0 sections, we
2362 need to bump up the number of section headers. */
2364 static int
2367 {
2386 }
2388 /* Modify the segment map if needed. */
2390 static bfd_boolean
2393 {
2395 }
2396 \f
2397 /* The powerpc .got has a blrl instruction in it. Mark it executable. */
2399 static bfd_boolean
2403 {
2406 flagword flags;
2431 }
2433 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2434 to output sections (just like _bfd_elf_create_dynamic_sections has
2435 to create .dynbss and .rela.bss). */
2437 static bfd_boolean
2441 {
2444 flagword flags;
2463 {
2470 }
2479 }
2481 /* Adjust a symbol defined by a dynamic object and referenced by a
2482 regular object. The current definition is in some section of the
2483 dynamic object, but we're not including those sections. We have to
2484 change the definition to something the rest of the link can
2485 understand. */
2487 static bfd_boolean
2491 {
2496 #ifdef DEBUG
2499 #endif
2501 /* Make sure we know what is going on here. */
2513 /* Deal with function syms. */
2516 {
2517 /* Clear procedure linkage table information for any symbol that
2518 won't need a .plt entry. */
2522 {
2523 /* A PLT entry is not required/allowed when:
2525 1. We are not using ld.so; because then the PLT entry
2526 can't be set up, so we can't use one.
2528 2. We know for certain that a call to this symbol
2529 will go to this object.
2531 3. GC has rendered the entry unused. */
2534 }
2536 }
2537 else
2540 /* If this is a weak symbol, and there is a real definition, the
2541 processor independent code will have arranged for us to see the
2542 real definition first, and we can just use the same value. */
2544 {
2550 h->elf_link_hash_flags
2554 }
2556 /* This is a reference to a symbol defined by a dynamic object which
2557 is not a function. */
2559 /* If we are creating a shared library, we must presume that the
2560 only references to the symbol are via the global offset table.
2561 For such cases we need not do anything here; the relocations will
2562 be handled correctly by relocate_section. */
2566 /* If there are no references to this symbol that do not use the
2567 GOT, we don't need to generate a copy reloc. */
2572 {
2575 {
2579 }
2581 /* If we didn't find any dynamic relocs in read-only sections, then
2582 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2584 {
2587 }
2588 }
2590 /* We must allocate the symbol in our .dynbss section, which will
2591 become part of the .bss section of the executable. There will be
2592 an entry for this symbol in the .dynsym section. The dynamic
2593 object will contain position independent code, so all references
2594 from the dynamic object to this symbol will go through the global
2595 offset table. The dynamic linker will use the .dynsym entry to
2596 determine the address it must put in the global offset table, so
2597 both the dynamic object and the regular object will refer to the
2598 same memory location for the variable.
2600 Of course, if the symbol is sufficiently small, we must instead
2601 allocate it in .sbss. FIXME: It would be better to do this if and
2602 only if there were actually SDAREL relocs for that symbol. */
2606 else
2610 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
2611 copy the initial value out of the dynamic object and into the
2612 runtime process image. We need to remember the offset into the
2613 .rela.bss section we are going to use. */
2615 {
2620 else
2625 }
2627 /* We need to figure out the alignment required for this symbol. I
2628 have no idea how ELF linkers handle this. */
2633 /* Apply the required alignment. */
2637 {
2640 }
2642 /* Define the symbol as being at this point in the section. */
2646 /* Increment the section size to make room for the symbol. */
2650 }
2651 \f
2652 /* This is the condition under which finish_dynamic_symbol will be
2653 called from elflink.h. If elflink.h doesn't call our
2654 finish_dynamic_symbol routine, we'll need to do something about
2655 initializing any .plt and .got entries in relocate_section. */
2656 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2657 ((DYN) \
2658 && ((SHARED) \
2659 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
2660 && ((H)->dynindx != -1 \
2661 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
2663 /* Of those relocs that might be copied as dynamic relocs, this macro
2664 selects those that must be copied when linking a shared library,
2665 even when the symbol is local. */
2667 #define MUST_BE_DYN_RELOC(RTYPE) \
2668 ((RTYPE) != R_PPC_REL24 \
2669 && (RTYPE) != R_PPC_REL14 \
2670 && (RTYPE) != R_PPC_REL14_BRTAKEN \
2671 && (RTYPE) != R_PPC_REL14_BRNTAKEN \
2672 && (RTYPE) != R_PPC_REL32)
2674 /* Allocate space in associated reloc sections for dynamic relocs. */
2676 static bfd_boolean
2679 PTR inf;
2680 {
2690 /* When warning symbols are created, they **replace** the "real"
2691 entry in the hash table, thus we never get to see the real
2692 symbol in a hash traversal. So look at it now. */
2700 {
2701 /* Make sure this symbol is output as a dynamic symbol. */
2704 {
2707 }
2711 {
2714 /* If this is the first .plt entry, make room for the special
2715 first entry. */
2719 /* The PowerPC PLT is actually composed of two parts, the
2720 first part is 2 words (for a load and a jump), and then
2721 there is a remaining word available at the end. */
2723 + (PLT_SLOT_SIZE
2727 /* If this symbol is not defined in a regular file, and we
2728 are not generating a shared library, then set the symbol
2729 to this location in the .plt. This is required to make
2730 function pointers compare as equal between the normal
2731 executable and the shared library. */
2734 {
2737 }
2739 /* Make room for this entry. After the 8192nd entry, room
2740 for two entries is allocated. */
2746 /* We also need to make an entry in the .rela.plt section. */
2748 }
2749 else
2750 {
2753 }
2754 }
2755 else
2756 {
2759 }
2763 {
2764 /* Make sure this symbol is output as a dynamic symbol. */
2767 {
2770 }
2774 /* If just an LD reloc, we'll just use htab->tlsld_got.offset. */
2776 else
2777 {
2778 bfd_boolean dyn;
2781 {
2790 }
2791 else
2798 {
2799 /* All the entries we allocated need relocs. */
2803 /* Except LD only needs one. */
2806 }
2807 }
2808 }
2809 else
2815 /* In the shared -Bsymbolic case, discard space allocated for
2816 dynamic pc-relative relocs against symbols which turn out to be
2817 defined in regular objects. For the normal shared case, discard
2818 space for relocs that have become local due to symbol visibility
2819 changes. */
2821 {
2825 {
2829 {
2834 else
2836 }
2837 }
2839 /* Also discard relocs on undefined weak syms with non-default
2840 visibility. */
2844 }
2846 {
2847 /* For the non-shared case, discard space for relocs against
2848 symbols which turn out to need copy relocs or are not
2849 dynamic. */
2854 {
2855 /* Make sure this symbol is output as a dynamic symbol.
2856 Undefined weak syms won't yet be marked as dynamic. */
2859 {
2862 }
2864 /* If that succeeded, we know we'll be keeping all the
2865 relocs. */
2868 }
2872 keep: ;
2873 }
2875 /* Finally, allocate space. */
2877 {
2880 }
2883 }
2885 /* Find any dynamic relocs that apply to read-only sections. */
2887 static bfd_boolean
2890 PTR info;
2891 {
2901 {
2907 {
2910 /* Not an error, just cut short the traversal. */
2912 }
2913 }
2915 }
2917 /* Set the sizes of the dynamic sections. */
2919 static bfd_boolean
2923 {
2926 bfd_boolean relocs;
2929 #ifdef DEBUG
2931 #endif
2937 {
2938 /* Set the contents of the .interp section to the interpreter. */
2940 {
2945 }
2946 }
2949 {
2954 }
2955 else
2958 /* Set up .got offsets for local syms, and space for local dynamic
2959 relocs. */
2961 {
2965 bfd_size_type locsymcount;
2973 {
2980 {
2983 {
2984 /* Input section has been discarded, either because
2985 it is a copy of a linkonce section or due to
2986 linker script /DISCARD/, so we'll be discarding
2987 the relocs too. */
2988 }
2990 {
2997 }
2998 }
2999 }
3013 {
3015 {
3016 /* If just an LD reloc, we'll just use
3017 htab->tlsld_got.offset. */
3019 {
3024 }
3026 }
3027 else
3028 {
3031 {
3038 }
3039 else
3044 }
3045 }
3046 else
3048 }
3050 /* Allocate space for global sym dynamic relocs. */
3053 /* We've now determined the sizes of the various dynamic sections.
3054 Allocate memory for them. */
3057 {
3065 {
3066 /* Strip this section if we don't need it; see the
3067 comment below. */
3068 }
3070 {
3072 {
3073 /* If we don't need this section, strip it from the
3074 output file. This is mostly to handle .rela.bss and
3075 .rela.plt. We must create both sections in
3076 create_dynamic_sections, because they must be created
3077 before the linker maps input sections to output
3078 sections. The linker does that before
3079 adjust_dynamic_symbol is called, and it is that
3080 function which decides whether anything needs to go
3081 into these sections. */
3082 }
3083 else
3084 {
3085 /* Remember whether there are any relocation sections. */
3088 /* We use the reloc_count field as a counter if we need
3089 to copy relocs into the output file. */
3091 }
3092 }
3093 else
3094 {
3095 /* It's not one of our sections, so don't allocate space. */
3097 }
3100 {
3103 }
3105 /* Allocate memory for the section contents. */
3109 }
3112 {
3113 /* Add some entries to the .dynamic section. We fill in the
3114 values later, in ppc_elf_finish_dynamic_sections, but we
3115 must add the entries now so that we get the correct size for
3116 the .dynamic section. The DT_DEBUG entry is filled in by the
3117 dynamic linker and used by the debugger. */
3118 #define add_dynamic_entry(TAG, VAL) \
3119 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
3122 {
3125 }
3128 {
3134 }
3137 {
3142 }
3144 /* If any dynamic relocs apply to a read-only section, then we
3145 need a DT_TEXTREL entry. */
3151 {
3154 }
3155 }
3156 #undef add_dynamic_entry
3159 }
3160 \f
3161 static bfd_boolean
3167 {
3172 {
3180 }
3186 }
3188 static void
3192 {
3198 }
3200 /* Look through the relocs for a section during the first phase, and
3201 allocate space in the global offset table or procedure linkage
3202 table. */
3204 static bfd_boolean
3210 {
3221 #ifdef DEBUG
3225 #endif
3227 /* Create the linker generated sections all the time so that the
3228 special symbols are created. */
3232 {
3236 LINKER_SECTION_SDATA);
3239 }
3242 {
3246 LINKER_SECTION_SDATA2);
3249 }
3257 {
3266 else
3269 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
3270 This shows up in particular in an R_PPC_ADDR32 in the eabi
3271 startup code. */
3273 {
3275 {
3280 }
3281 }
3285 {
3315 dogottls:
3317 /* Fall thru */
3319 /* GOT16 relocations */
3324 /* This symbol requires a global offset table entry. */
3326 {
3331 }
3333 {
3336 }
3337 else
3338 /* This is a global offset table entry for a local symbol. */
3343 /* Indirect .sdata relocation. */
3346 {
3349 }
3355 /* Indirect .sdata2 relocation. */
3358 {
3361 }
3377 {
3380 }
3389 #ifdef DEBUG
3391 #endif
3392 /* This symbol requires a procedure linkage table entry. We
3393 actually build the entry in finish_dynamic_symbol,
3394 because this might be a case of linking PIC code without
3395 linking in any dynamic objects, in which case we don't
3396 need to generate a procedure linkage table after all. */
3399 {
3400 /* It does not make sense to have a procedure linkage
3401 table entry for a local symbol. */
3404 }
3410 /* The following relocations don't need to propagate the
3411 relocation if linking a shared object since they are
3412 section relative. */
3424 /* This are just markers. */
3431 /* These should only appear in dynamic objects. */
3438 /* These aren't handled yet. We'll report an error later. */
3447 /* This refers only to functions defined in the shared library. */
3451 /* This relocation describes the C++ object vtable hierarchy.
3452 Reconstruct it for later use during GC. */
3458 /* This relocation describes which C++ vtable entries are actually
3459 used. Record for later use during GC. */
3465 /* We shouldn't really be seeing these. */
3471 /* Nor these. */
3484 /* When creating a shared object, we must copy these
3485 relocs into the output file. We create a reloc
3486 section in dynobj and make room for the reloc. */
3495 /* fall through */
3509 {
3510 /* We may need a plt entry if the symbol turns out to be
3511 a function defined in a dynamic object. */
3514 /* We may need a copy reloc too. */
3516 }
3518 dodyn:
3519 /* If we are creating a shared library, and this is a reloc
3520 against a global symbol, or a non PC relative reloc
3521 against a local symbol, then we need to copy the reloc
3522 into the shared library. However, if we are linking with
3523 -Bsymbolic, we do not need to copy a reloc against a
3524 global symbol which is defined in an object we are
3525 including in the link (i.e., DEF_REGULAR is set). At
3526 this point we have not seen all the input files, so it is
3527 possible that DEF_REGULAR is not set now but will be set
3528 later (it is never cleared). In case of a weak definition,
3529 DEF_REGULAR may be cleared later by a strong definition in
3530 a shared library. We account for that possibility below by
3531 storing information in the dyn_relocs field of the hash
3532 table entry. A similar situation occurs when creating
3533 shared libraries and symbol visibility changes render the
3534 symbol local.
3536 If on the other hand, we are creating an executable, we
3537 may need to keep relocations for symbols satisfied by a
3538 dynamic library if we manage to avoid copy relocs for the
3539 symbol. */
3547 || (ELIMINATE_COPY_RELOCS
3554 {
3558 #ifdef DEBUG
3562 #endif
3564 {
3567 name = (bfd_elf_string_from_elf_section
3580 {
3581 flagword flags;
3594 }
3596 }
3598 /* If this is a global symbol, we count the number of
3599 relocations we need for this symbol. */
3601 {
3603 }
3604 else
3605 {
3606 /* Track dynamic relocs needed for local syms too.
3607 We really need local syms available to do this
3608 easily. Oh well. */
3618 }
3622 {
3632 }
3637 }
3640 }
3641 }
3644 }
3646 /* Return the section that should be marked against GC for a given
3647 relocation. */
3656 {
3658 {
3660 {
3667 {
3677 }
3678 }
3679 }
3680 else
3684 }
3686 /* Update the got, plt and dynamic reloc reference counts for the
3687 section being removed. */
3689 static bfd_boolean
3695 {
3711 {
3718 {
3727 {
3728 /* Everything must go for SEC. */
3731 }
3732 }
3736 {
3742 /* Fall thru */
3761 {
3764 }
3766 {
3769 }
3780 /* Fall thru */
3799 {
3802 }
3807 }
3808 }
3810 }
3812 /* Set htab->tls_sec and htab->tls_get_addr. */
3814 bfd_boolean
3818 {
3833 }
3835 /* Run through all the TLS relocs looking for optimization
3836 opportunities. */
3838 bfd_boolean
3842 {
3852 {
3858 {
3862 /* Read the relocations. */
3872 {
3878 bfd_boolean is_local;
3882 {
3890 }
3899 {
3904 /* These relocs should never be against a symbol
3905 defined in a shared lib. Leave them alone if
3906 that turns out to be the case. */
3912 /* LD -> LE */
3923 /* GD -> LE */
3925 else
3926 /* GD -> IE */
3938 {
3939 /* IE -> LE */
3943 }
3944 else
3954 {
3957 }
3964 }
3967 {
3969 {
3970 /* We managed to get rid of a got entry. */
3973 }
3975 }
3976 else
3977 {
3983 {
3990 {
3994 }
3995 }
4001 {
4002 /* We managed to get rid of a got entry. */
4005 }
4008 }
4012 }
4016 }
4020 {
4023 else
4025 }
4026 }
4028 }
4029 \f
4030 /* Hook called by the linker routine which adds symbols from an object
4031 file. We use it to put .comm items in .sbss, and not .bss. */
4033 static bfd_boolean
4042 {
4047 {
4048 /* Common symbols less than or equal to -G nn bytes are automatically
4049 put into .sdata. */
4050 elf_linker_section_t *sdata
4054 {
4055 bfd_size_type amt;
4057 /* We don't go through bfd_make_section, because we don't
4058 want to attach this common section to DYNOBJ. The linker
4059 will move the symbols to the appropriate output section
4060 when it defines common symbols. */
4080 }
4084 }
4087 }
4088 \f
4089 /* Finish up dynamic symbol handling. We set the contents of various
4090 dynamic sections here. */
4092 static bfd_boolean
4098 {
4101 #ifdef DEBUG
4104 #endif
4110 {
4111 Elf_Internal_Rela rela;
4113 bfd_vma reloc_index;
4115 #ifdef DEBUG
4117 #endif
4119 /* This symbol has an entry in the procedure linkage table. Set
4120 it up. */
4125 /* We don't need to fill in the .plt. The ppc dynamic linker
4126 will fill it in. */
4128 /* Fill in the entry in the .rela.plt section. */
4143 {
4144 /* Mark the symbol as undefined, rather than as defined in
4145 the .plt section. Leave the value alone. */
4147 /* If the symbol is weak, we do need to clear the value.
4148 Otherwise, the PLT entry would provide a definition for
4149 the symbol even if the symbol wasn't defined anywhere,
4150 and so the symbol would never be NULL. */
4154 }
4155 }
4158 {
4160 Elf_Internal_Rela rela;
4163 /* This symbols needs a copy reloc. Set it up. */
4165 #ifdef DEBUG
4167 #endif
4173 else
4184 }
4186 #ifdef DEBUG
4188 #endif
4190 /* Mark some specially defined symbols as absolute. */
4197 }
4198 \f
4199 /* Finish up the dynamic sections. */
4201 static bfd_boolean
4205 {
4209 #ifdef DEBUG
4211 #endif
4217 {
4225 {
4226 Elf_Internal_Dyn dyn;
4232 {
4249 }
4252 }
4253 }
4255 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
4256 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
4258 {
4264 else
4270 }
4273 }
4274 \f
4275 /* The RELOCATE_SECTION function is called by the ELF backend linker
4276 to handle the relocations for a section.
4278 The relocs are always passed as Rela structures; if the section
4279 actually uses Rel structures, the r_addend field will always be
4280 zero.
4282 This function is responsible for adjust the section contents as
4283 necessary, and (if using Rela relocs and generating a
4284 relocateable output file) adjusting the reloc addend as
4285 necessary.
4287 This function does not have to worry about setting the reloc
4288 address or the reloc symbol index.
4290 LOCAL_SYMS is a pointer to the swapped in local symbols.
4292 LOCAL_SECTIONS is an array giving the section in the input file
4293 corresponding to the st_shndx field of each local symbol.
4295 The global hash table entry for the global symbols can be found
4296 via elf_sym_hashes (input_bfd).
4298 When generating relocateable output, this function must handle
4299 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
4300 going to be the section symbol corresponding to the output
4301 section, which means that the addend must be adjusted
4302 accordingly. */
4304 static bfd_boolean
4315 {
4321 Elf_Internal_Rela outrel;
4327 #ifdef DEBUG
4333 #endif
4339 /* Initialize howto table if needed. */
4349 {
4351 bfd_vma addend;
4352 bfd_reloc_status_type r;
4359 bfd_vma relocation;
4361 bfd_boolean unresolved_reloc;
4362 bfd_boolean warned;
4373 {
4379 }
4380 else
4381 {
4391 {
4393 /* Set a flag that will be cleared later if we find a
4394 relocation value for this symbol. output_section
4395 is typically NULL for symbols satisfied by a shared
4396 library. */
4399 else
4403 }
4405 ;
4409 ;
4410 else
4411 {
4419 }
4420 }
4422 /* TLS optimizations. Replace instruction sequences and relocs
4423 based on information we collected in tls_optimize. We edit
4424 RELOCS so that --emit-relocs will output something sensible
4425 for the final instruction stream. */
4429 {
4433 {
4437 }
4438 }
4440 /* Ensure reloc mapping code below stays sane. */
4451 {
4459 {
4460 bfd_vma insn;
4467 }
4473 {
4482 else
4485 /* add -> addi. */
4491 /* load and store indexed -> dform. */
4495 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
4500 /* lwax -> lwa. */
4502 else
4508 /* Was PPC_TLS which sits on insn boundary, now
4509 PPC_TPREL16_LO which is at insn+2. */
4511 }
4524 {
4525 tls_gdld_hi:
4529 else
4530 {
4534 }
4536 }
4549 {
4550 tls_get_addr_check:
4552 {
4557 bfd_vma offset;
4559 /* The next instruction should be a call to
4560 __tls_get_addr. Peek at the reloc to be sure. */
4561 r_type2
4579 /* OK, it checks out. Replace the call. */
4584 {
4585 /* IE */
4593 }
4594 else
4595 {
4596 /* LE */
4600 {
4601 /* Was an LD reloc. */
4605 }
4609 R_PPC_TPREL16_LO);
4611 }
4615 {
4616 /* We changed the symbol on an LD reloc. Start over
4617 in order to get h, sym, sec etc. right. */
4618 rel--;
4620 }
4621 }
4622 }
4624 }
4626 /* Handle other relocations that tweak non-addend part of insn. */
4629 {
4633 /* Branch taken prediction relocations. */
4637 /* Fall thru */
4639 /* Branch not taken predicition relocations. */
4650 /* Invert 'y' bit if not the default. */
4656 }
4664 {
4681 /* GOT16 relocations. Like an ADDR16 using the symbol's
4682 address in the GOT as relocation value instead of the
4683 symbol's value itself. Also, create a GOT entry for the
4684 symbol and put the symbol value there. */
4717 dogot:
4718 {
4719 /* Relocation is to the entry for this symbol in the global
4720 offset table. */
4721 bfd_vma off;
4734 {
4735 bfd_boolean dyn;
4740 /* This is actually a static link, or it is a
4741 -Bsymbolic link and the symbol is defined
4742 locally, or the symbol was forced to be local
4743 because of a version file. */
4744 ;
4745 else
4746 {
4749 }
4751 }
4752 else
4753 {
4757 }
4759 /* The offset must always be a multiple of 4. We use the
4760 least significant bit to record whether we have already
4761 processed this entry. */
4765 else
4766 {
4778 /* We might have multiple got entries for this sym.
4779 Initialize them all. */
4780 do
4781 {
4785 {
4788 }
4790 {
4793 }
4795 {
4798 }
4800 {
4803 }
4805 /* Generate relocs for the dynamic linker. */
4810 {
4816 {
4819 {
4826 outrel.r_info
4828 }
4829 }
4836 else
4839 {
4843 }
4848 }
4850 /* Init the .got section contents if we're not
4851 emitting a reloc. */
4852 else
4853 {
4859 {
4865 {
4869 }
4870 }
4873 }
4878 }
4883 }
4889 {
4891 {
4898 {
4902 {
4905 }
4906 }
4907 }
4908 }
4912 /* Addends on got relocations don't make much sense.
4913 x+off@got is actually x@got+off, and since the got is
4914 generated by a hash table traversal, the value in the
4915 got at entry m+n bears little relation to the entry m. */
4923 sym_name);
4924 }
4927 /* Relocations that need no special processing. */
4929 /* It makes no sense to point a local relocation
4930 at a symbol not in this object. */
4932 {
4935 input_bfd,
4936 input_section,
4938 TRUE))
4941 }
4951 /* Relocations that may need to be propagated if this is a shared
4952 object. */
4958 /* The TPREL16 relocs shouldn't really be used in shared
4959 libs as they will result in DT_TEXTREL being set, but
4960 support them anyway. */
4981 /* If these relocations are not to a named symbol, they can be
4982 handled right here, no need to bother the dynamic linker. */
4987 /* fall through */
4989 /* Relocations that always need to be propagated if this is a shared
4990 object. */
5002 /* r_symndx will be zero only for relocs against symbols
5003 from removed linkonce sections, or sections discarded by
5004 a linker script. */
5005 dodyn:
5008 /* Fall thru. */
5020 || (ELIMINATE_COPY_RELOCS
5028 {
5031 #ifdef DEBUG
5035 #endif
5037 /* When generating a shared object, these relocations
5038 are copied into the output file to be resolved at run
5039 time. */
5041 {
5044 name = (bfd_elf_string_from_elf_section
5053 input_section),
5058 }
5075 {
5079 }
5080 else
5081 {
5086 else
5087 {
5093 {
5096 }
5097 else
5098 {
5101 /* We are turning this relocation into one
5102 against a section symbol. It would be
5103 proper to subtract the symbol's value,
5104 osec->vma, from the emitted reloc addend,
5105 but ld.so expects buggy relocs. */
5109 #ifdef DEBUG
5111 {
5115 }
5116 #endif
5117 }
5120 }
5121 }
5130 /* This reloc will be computed at runtime. We clear the memory
5131 so that it contains predictable value. */
5135 {
5139 }
5140 }
5143 /* Indirect .sdata relocation. */
5146 relocation
5150 R_PPC_RELATIVE);
5153 /* Indirect .sdata2 relocation. */
5156 relocation
5160 R_PPC_RELATIVE);
5163 /* Handle the TOC16 reloc. We want to use the offset within the .got
5164 section, not the actual VMA. This is appropriate when generating
5165 an embedded ELF object, for which the .got section acts like the
5166 AIX .toc section. */
5177 /* Relocation is to the entry for this symbol in the
5178 procedure linkage table. */
5183 {
5184 /* We didn't make a PLT entry for this symbol. This
5185 happens when statically linking PIC code, or when
5186 using -Bsymbolic. */
5188 }
5196 /* Relocate against _SDA_BASE_. */
5198 {
5208 {
5209 (*_bfd_error_handler) (_("%s: the target (%s) of a %s relocation is in the wrong output section (%s)"),
5211 sym_name,
5213 name);
5214 }
5219 }
5222 /* Relocate against _SDA2_BASE_. */
5224 {
5232 {
5233 (*_bfd_error_handler) (_("%s: the target (%s) of a %s relocation is in the wrong output section (%s)"),
5235 sym_name,
5237 name);
5242 }
5247 }
5250 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
5253 {
5264 {
5270 }
5274 {
5280 }
5284 {
5286 }
5288 else
5289 {
5290 (*_bfd_error_handler) (_("%s: the target (%s) of a %s relocation is in the wrong output section (%s)"),
5292 sym_name,
5294 name);
5299 }
5306 }
5307 }
5310 /* Relocate against the beginning of the section. */
5319 /* Negative relocations. */
5347 sym_name);
5352 }
5354 /* Do any further special processing. */
5356 {
5372 /* It's just possible that this symbol is a weak symbol
5373 that's not actually defined anywhere. In that case,
5374 'sec' would be NULL, and we should leave the symbol
5375 alone (it will be set to zero elsewhere in the link). */
5377 /* Add 0x10000 if sign bit in 0:15 is set.
5378 Bits 0:15 are not used. */
5381 }
5383 #ifdef DEBUG
5384 fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n",
5387 sym_name,
5388 r_symndx,
5391 #endif
5396 {
5403 sym_name);
5405 }
5408 input_bfd,
5409 input_section,
5410 contents,
5412 relocation,
5413 addend);
5416 {
5420 {
5426 {
5427 /* Assume this is a call protected by other code that
5428 detect the symbol is undefined. If this is the case,
5429 we can safely ignore the overflow. If not, the
5430 program is hosed anyway, and a little warning isn't
5431 going to help. */
5434 }
5437 sym_name,
5440 input_bfd,
5441 input_section,
5444 }
5445 else
5446 {
5453 }
5454 }
5455 }
5457 #ifdef DEBUG
5459 #endif
5462 }
5464 static enum elf_reloc_type_class
5467 {
5469 {
5480 }
5481 }
5482 \f
5483 /* Support for core dump NOTE sections. */
5485 static bfd_boolean
5489 {
5494 {
5499 /* pr_cursig */
5502 /* pr_pid */
5505 /* pr_reg */
5510 }
5512 /* Make a ".reg/999" section. */
5515 }
5517 static bfd_boolean
5521 {
5523 {
5532 }
5534 /* Note that for some reason, a spurious space is tacked
5535 onto the end of the args in some (at least one anyway)
5536 implementations, so strip it off if it exists. */
5538 {
5544 }
5547 }
5548 \f
5549 /* Very simple linked list structure for recording apuinfo values. */
5551 {
5554 }
5555 apuinfo_list;
5569 extern bfd_boolean ppc_elf_write_section
5573 static void
5575 {
5577 }
5579 static void
5582 {
5586 {
5590 }
5599 }
5601 static unsigned
5603 {
5608 entry;
5613 }
5618 {
5624 ;
5627 }
5629 static void
5631 {
5635 {
5639 }
5642 }
5647 /* Scan the input BFDs and create a linked list of
5648 the APUinfo values that will need to be emitted. */
5650 void
5654 {
5659 bfd_size_type output_section_size;
5669 /* Scan the input bfds, looking for apuinfo sections. */
5674 {
5677 {
5680 }
5681 }
5683 /* We need at least one input sections
5684 in order to make merging worthwhile. */
5688 /* Just make sure that the output section exists as well. */
5693 /* Allocate a buffer for the contents of the input sections. */
5701 /* Read in the input sections contents. */
5703 {
5713 {
5716 }
5720 {
5723 }
5725 /* Process the contents of the section. */
5729 /* Verify the contents of the header. Note - we have to
5730 extract the values this way in order to allow for a
5731 host whose endian-ness is different from the target. */
5743 /* Get the number of apuinfo entries. */
5748 /* Make sure that we do not run off the end of the section. */
5752 /* Scan the apuinfo section, building a list of apuinfo numbers. */
5756 /* Update the offset. */
5758 }
5762 /* Compute the size of the output section. */
5772 fail:
5778 }
5781 /* Prevent the output section from accumulating the input sections'
5782 contents. We have already stored this in our linked list structure. */
5784 bfd_boolean
5789 {
5792 }
5795 /* Finally we can generate the output section. */
5797 void
5800 bfd_boolean linker ATTRIBUTE_UNUSED;
5801 {
5806 bfd_size_type length;
5821 {
5825 }
5827 /* Create the apuinfo header. */
5836 {
5839 }
5850 }
5851 \f
5852 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
5854 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
5856 #define ELF_ARCH bfd_arch_powerpc
5857 #define ELF_MACHINE_CODE EM_PPC
5858 #define ELF_MAXPAGESIZE 0x10000
5859 #define elf_info_to_howto ppc_elf_info_to_howto
5861 #ifdef EM_CYGNUS_POWERPC
5862 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
5863 #endif
5865 #ifdef EM_PPC_OLD
5866 #define ELF_MACHINE_ALT2 EM_PPC_OLD
5867 #endif
5869 #define elf_backend_plt_not_loaded 1
5870 #define elf_backend_got_symbol_offset 4
5871 #define elf_backend_can_gc_sections 1
5872 #define elf_backend_can_refcount 1
5873 #define elf_backend_got_header_size 12
5874 #define elf_backend_plt_header_size PLT_INITIAL_ENTRY_SIZE
5875 #define elf_backend_rela_normal 1
5877 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
5878 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
5879 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
5880 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
5881 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create
5883 #define elf_backend_object_p ppc_elf_object_p
5884 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
5885 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
5886 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
5887 #define elf_backend_relocate_section ppc_elf_relocate_section
5888 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
5889 #define elf_backend_check_relocs ppc_elf_check_relocs
5890 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol
5891 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
5892 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
5893 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
5894 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
5895 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
5896 #define elf_backend_fake_sections ppc_elf_fake_sections
5897 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
5898 #define elf_backend_modify_segment_map ppc_elf_modify_segment_map
5899 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
5900 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
5901 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
5902 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing
5903 #define elf_backend_final_write_processing ppc_elf_final_write_processing
5904 #define elf_backend_write_section ppc_elf_write_section