| blob | 186f39d82b68248b17cb4bed489c267146c50e7e |
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 Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22 /* This file is based on a preliminary PowerPC ELF ABI. The
23 information may not match the final PowerPC ELF ABI. It includes
24 suggestions from the in-progress Embedded PowerPC ABI, and that
25 information may also not match. */
35 /* RELA relocations are used here. */
42 static void ppc_elf_copy_indirect_symbol
47 static void ppc_elf_info_to_howto
49 static void ppc_elf_howto_init
51 static int ppc_elf_sort_rela
53 static bfd_boolean ppc_elf_relax_section
55 static bfd_reloc_status_type ppc_elf_addr16_ha_reloc
57 static bfd_reloc_status_type ppc_elf_unhandled_reloc
59 static bfd_boolean ppc_elf_object_p
61 static bfd_boolean ppc_elf_set_private_flags
63 static bfd_boolean ppc_elf_merge_private_bfd_data
65 static int ppc_elf_additional_program_headers
67 static bfd_boolean ppc_elf_modify_segment_map
69 static bfd_boolean ppc_elf_create_got
71 static bfd_boolean ppc_elf_create_dynamic_sections
73 static bfd_boolean ppc_elf_section_from_shdr
75 static bfd_boolean ppc_elf_fake_sections
80 static bfd_boolean update_local_sym_info
82 static void bad_shared_reloc
84 static bfd_boolean ppc_elf_check_relocs
90 static bfd_boolean ppc_elf_gc_sweep_hook
93 static bfd_boolean ppc_elf_adjust_dynamic_symbol
95 static bfd_boolean allocate_dynrelocs
97 static bfd_boolean readonly_dynrelocs
99 static bfd_boolean ppc_elf_size_dynamic_sections
101 static bfd_boolean ppc_elf_relocate_section
104 asection **));
105 static bfd_boolean ppc_elf_add_symbol_hook
108 static bfd_boolean ppc_elf_finish_dynamic_symbol
110 Elf_Internal_Sym *));
111 static bfd_boolean ppc_elf_finish_dynamic_sections
113 static enum elf_reloc_type_class ppc_elf_reloc_type_class
115 static bfd_boolean ppc_elf_grok_prstatus
117 static bfd_boolean ppc_elf_grok_psinfo
120 /* Branch prediction bit for branch taken relocs. */
121 #define BRANCH_PREDICT_BIT 0x200000
122 /* Mask to set RA in memory instructions. */
123 #define RA_REGISTER_MASK 0x001f0000
124 /* Value to shift register by to insert RA. */
125 #define RA_REGISTER_SHIFT 16
127 /* The name of the dynamic interpreter. This is put in the .interp
128 section. */
131 /* The size in bytes of an entry in the procedure linkage table. */
132 #define PLT_ENTRY_SIZE 12
133 /* The initial size of the plt reserved for the dynamic linker. */
134 #define PLT_INITIAL_ENTRY_SIZE 72
135 /* The size of the gap between entries in the PLT. */
136 #define PLT_SLOT_SIZE 8
137 /* The number of single-slot PLT entries (the rest use two slots). */
138 #define PLT_NUM_SINGLE_ENTRIES 8192
140 /* Some nop instructions. */
141 #define NOP 0x60000000
142 #define CROR_151515 0x4def7b82
143 #define CROR_313131 0x4ffffb82
145 /* Offset of tp and dtp pointers from start of TLS block. */
146 #define TP_OFFSET 0x7000
147 #define DTP_OFFSET 0x8000
149 /* Will references to this symbol always reference the symbol
150 in this object? STV_PROTECTED is excluded from the visibility test
151 here so that function pointer comparisons work properly. Since
152 function symbols not defined in an app are set to their .plt entry,
153 it's necessary for shared libs to also reference the .plt even
154 though the symbol is really local to the shared lib. */
155 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
156 ((! INFO->shared \
157 || INFO->symbolic \
158 || H->dynindx == -1 \
159 || ELF_ST_VISIBILITY (H->other) == STV_INTERNAL \
160 || ELF_ST_VISIBILITY (H->other) == STV_HIDDEN) \
161 && (H->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
163 /* Will _calls_ to this symbol always call the version in this object? */
164 #define SYMBOL_CALLS_LOCAL(INFO, H) \
165 ((! INFO->shared \
166 || INFO->symbolic \
167 || H->dynindx == -1 \
168 || ELF_ST_VISIBILITY (H->other) != STV_DEFAULT) \
169 && (H->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
170 \f
171 /* The PPC linker needs to keep track of the number of relocs that it
172 decides to copy as dynamic relocs in check_relocs for each symbol.
173 This is so that it can later discard them if they are found to be
174 unnecessary. We store the information in a field extending the
175 regular ELF linker hash table. */
177 struct ppc_elf_dyn_relocs
178 {
181 /* The input section of the reloc. */
184 /* Total number of relocs copied for the input section. */
185 bfd_size_type count;
187 /* Number of pc-relative relocs copied for the input section. */
188 bfd_size_type pc_count;
189 };
191 /* PPC ELF linker hash entry. */
193 struct ppc_elf_link_hash_entry
194 {
197 /* Track dynamic relocs copied for this symbol. */
200 /* Contexts in which symbol is used in the GOT (or TOC).
201 TLS_GD .. TLS_EXPLICIT bits are or'd into the mask as the
202 corresponding relocs are encountered during check_relocs.
203 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
204 indicate the corresponding GOT entry type is not needed. */
212 };
214 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent))
216 /* PPC ELF linker hash table. */
218 struct ppc_elf_link_hash_table
219 {
222 /* Short-cuts to get to dynamic linker sections. */
234 /* Short-cut to first output tls section. */
237 /* Shortcut to .__tls_get_addr. */
240 /* TLS local dynamic got entry handling. */
242 bfd_signed_vma refcount;
243 bfd_vma offset;
246 /* Small local sym to section mapping cache. */
248 };
250 /* Get the PPC ELF linker hash table from a link_info structure. */
252 #define ppc_elf_hash_table(p) \
253 ((struct ppc_elf_link_hash_table *) (p)->hash)
255 /* Create an entry in a PPC ELF linker hash table. */
262 {
263 /* Allocate the structure if it has not already been allocated by a
264 subclass. */
266 {
271 }
273 /* Call the allocation method of the superclass. */
276 {
279 }
282 }
284 /* Create a PPC ELF linker hash table. */
289 {
298 ppc_elf_link_hash_newfunc))
299 {
302 }
320 }
322 /* Copy the extra info we tack onto an elf_link_hash_entry. */
324 static void
328 {
335 {
337 {
344 /* Add reloc counts against the weak sym to the strong sym
345 list. Merge any entries against the same section. */
347 {
352 {
357 }
360 }
362 }
366 }
371 }
372 \f
376 /* This reloc does nothing. */
391 /* A standard 32 bit relocation. */
406 /* An absolute 26 bit branch; the lower two bits must be zero.
407 FIXME: we don't check that, we just clear them. */
422 /* A standard 16 bit relocation. */
437 /* A 16 bit relocation without overflow. */
452 /* The high order 16 bits of an address. */
467 /* The high order 16 bits of an address, plus 1 if the contents of
468 the low 16 bits, treated as a signed number, is negative. */
483 /* An absolute 16 bit branch; the lower two bits must be zero.
484 FIXME: we don't check that, we just clear them. */
499 /* An absolute 16 bit branch, for which bit 10 should be set to
500 indicate that the branch is expected to be taken. The lower two
501 bits must be zero. */
516 /* An absolute 16 bit branch, for which bit 10 should be set to
517 indicate that the branch is not expected to be taken. The lower
518 two bits must be zero. */
533 /* A relative 26 bit branch; the lower two bits must be zero. */
548 /* A relative 16 bit branch; the lower two bits must be zero. */
563 /* A relative 16 bit branch. Bit 10 should be set to indicate that
564 the branch is expected to be taken. The lower two bits must be
565 zero. */
580 /* A relative 16 bit branch. Bit 10 should be set to indicate that
581 the branch is not expected to be taken. The lower two bits must
582 be zero. */
597 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the
598 symbol. */
613 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
614 the symbol. */
629 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
630 the symbol. */
645 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
646 the symbol. */
661 /* Like R_PPC_REL24, but referring to the procedure linkage table
662 entry for the symbol. */
677 /* This is used only by the dynamic linker. The symbol should exist
678 both in the object being run and in some shared library. The
679 dynamic linker copies the data addressed by the symbol from the
680 shared library into the object, because the object being
681 run has to have the data at some particular address. */
696 /* Like R_PPC_ADDR32, but used when setting global offset table
697 entries. */
712 /* Marks a procedure linkage table entry for a symbol. */
727 /* Used only by the dynamic linker. When the object is run, this
728 longword is set to the load address of the object, plus the
729 addend. */
744 /* Like R_PPC_REL24, but uses the value of the symbol within the
745 object rather than the final value. Normally used for
746 _GLOBAL_OFFSET_TABLE_. */
761 /* Like R_PPC_ADDR32, but may be unaligned. */
776 /* Like R_PPC_ADDR16, but may be unaligned. */
791 /* 32-bit PC relative */
806 /* 32-bit relocation to the symbol's procedure linkage table.
807 FIXME: not supported. */
822 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
823 FIXME: not supported. */
838 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
839 the symbol. */
854 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
855 the symbol. */
870 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
871 the symbol. */
886 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
887 small data items. */
902 /* 16-bit section relative relocation. */
917 /* 16-bit lower half section relative relocation. */
932 /* 16-bit upper half section relative relocation. */
947 /* 16-bit upper half adjusted section relative relocation. */
962 /* Marker reloc for TLS. */
977 /* Computes the load module index of the load module that contains the
978 definition of its TLS sym. */
993 /* Computes a dtv-relative displacement, the difference between the value
994 of sym+add and the base address of the thread-local storage block that
995 contains the definition of sym, minus 0x8000. */
1010 /* A 16 bit dtprel reloc. */
1025 /* Like DTPREL16, but no overflow. */
1040 /* Like DTPREL16_LO, but next higher group of 16 bits. */
1055 /* Like DTPREL16_HI, but adjust for low 16 bits. */
1070 /* Computes a tp-relative displacement, the difference between the value of
1071 sym+add and the value of the thread pointer (r13). */
1086 /* A 16 bit tprel reloc. */
1101 /* Like TPREL16, but no overflow. */
1116 /* Like TPREL16_LO, but next higher group of 16 bits. */
1131 /* Like TPREL16_HI, but adjust for low 16 bits. */
1146 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
1147 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset
1148 to the first entry. */
1163 /* Like GOT_TLSGD16, but no overflow. */
1178 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */
1193 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */
1208 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
1209 with values (sym+add)@dtpmod and zero, and computes the offset to the
1210 first entry. */
1225 /* Like GOT_TLSLD16, but no overflow. */
1240 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */
1255 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */
1270 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes
1271 the offset to the entry. */
1286 /* Like GOT_DTPREL16, but no overflow. */
1301 /* Like GOT_DTPREL16_LO, but next higher group of 16 bits. */
1316 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */
1331 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the
1332 offset to the entry. */
1347 /* Like GOT_TPREL16, but no overflow. */
1362 /* Like GOT_TPREL16_LO, but next higher group of 16 bits. */
1377 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */
1392 /* The remaining relocs are from the Embedded ELF ABI, and are not
1393 in the SVR4 ELF ABI. */
1395 /* 32 bit value resulting from the addend minus the symbol. */
1410 /* 16 bit value resulting from the addend minus the symbol. */
1425 /* 16 bit value resulting from the addend minus the symbol. */
1440 /* The high order 16 bits of the addend minus the symbol. */
1455 /* The high order 16 bits of the result of the addend minus the address,
1456 plus 1 if the contents of the low 16 bits, treated as a signed number,
1457 is negative. */
1472 /* 16 bit value resulting from allocating a 4 byte word to hold an
1473 address in the .sdata section, and returning the offset from
1474 _SDA_BASE_ for that relocation. */
1489 /* 16 bit value resulting from allocating a 4 byte word to hold an
1490 address in the .sdata2 section, and returning the offset from
1491 _SDA2_BASE_ for that relocation. */
1506 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
1507 small data items. */
1522 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
1523 signed offset from the appropriate base, and filling in the register
1524 field with the appropriate register (0, 2, or 13). */
1539 /* Relocation not handled: R_PPC_EMB_MRKREF */
1540 /* Relocation not handled: R_PPC_EMB_RELSEC16 */
1541 /* Relocation not handled: R_PPC_EMB_RELST_LO */
1542 /* Relocation not handled: R_PPC_EMB_RELST_HI */
1543 /* Relocation not handled: R_PPC_EMB_RELST_HA */
1544 /* Relocation not handled: R_PPC_EMB_BIT_FLD */
1546 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
1547 in the 16 bit signed offset from the appropriate base, and filling in the
1548 register field with the appropriate register (0, 2, or 13). */
1563 /* GNU extension to record C++ vtable hierarchy. */
1578 /* GNU extension to record C++ vtable member usage. */
1593 /* Phony reloc to handle AIX style TOC entries. */
1607 };
1608 \f
1609 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
1611 static void
1613 {
1617 {
1621 }
1622 }
1623 \f
1624 /* This function handles relaxing for the PPC with option --mpc860c0[=<n>].
1626 The MPC860, revision C0 or earlier contains a bug in the die.
1627 If all of the following conditions are true, the next instruction
1628 to be executed *may* be treated as a no-op.
1629 1/ A forward branch is executed.
1630 2/ The branch is predicted as not taken.
1631 3/ The branch is taken.
1632 4/ The branch is located in the last 5 words of a page.
1633 (The EOP limit is 5 by default but may be specified as any value from 1-10.)
1635 Our software solution is to detect these problematic branches in a
1636 linker pass and modify them as follows:
1637 1/ Unconditional branches - Since these are always predicted taken,
1638 there is no problem and no action is required.
1639 2/ Conditional backward branches - No problem, no action required.
1640 3/ Conditional forward branches - Ensure that the "inverse prediction
1641 bit" is set (ensure it is predicted taken).
1642 4/ Conditional register branches - Ensure that the "y bit" is set
1643 (ensure it is predicted taken). */
1645 /* Sort sections by address. */
1647 static int
1651 {
1655 /* Sort by offset. */
1657 }
1659 static bfd_boolean
1665 {
1666 #define PAGESIZE 0x1000
1675 /* We never have to do this more than once per input section. */
1678 /* If needed, initialize this section's cooked size. */
1682 /* We're only interested in text sections which overlap the
1683 troublesome area at the end of a page. */
1685 {
1687 bfd_boolean section_modified;
1689 /* Get the section contents. */
1690 /* Get cached copy if it exists. */
1693 else
1694 {
1695 /* Go get them off disk. */
1704 }
1709 {
1711 bfd_size_type amt;
1713 /* Get a copy of the native relocations. */
1714 internal_relocs
1723 /* Setup a faster access method for the reloc info we need. */
1730 {
1737 /* Prologue constants are sometimes present in the ".text"
1738 sections and they can be identified by their associated
1739 relocation. We don't want to process those words and
1740 some others which can also be identified by their
1741 relocations. However, not all conditional branches will
1742 have a relocation so we will only ignore words that
1743 1) have a reloc, and 2) the reloc is not applicable to a
1744 conditional branch. The array rela_comb is built here
1745 for use in the EOP scan loop. */
1747 {
1751 /* We should check the instruction. */
1754 /* The word is not a conditional branch - ignore it. */
1757 }
1758 }
1761 ppc_elf_sort_rela);
1762 }
1764 /* Enumerate each EOP region that overlaps this section. */
1769 /* Increment the start position if this section begins in the
1770 middle of its first EOP region. */
1776 {
1777 /* Check each word in this EOP region. */
1779 {
1780 bfd_vma isec_offset;
1784 /* Don't process this word if there is a relocation for it
1785 and the relocation indicates the word is not a
1786 conditional branch. */
1790 {
1791 bfd_vma r_offset;
1795 {
1798 }
1799 }
1802 /* Check the current word for a problematic conditional
1803 branch. */
1804 #define BO0(insn) ((insn) & 0x02000000)
1805 #define BO2(insn) ((insn) & 0x00800000)
1806 #define BO4(insn) ((insn) & 0x00200000)
1810 {
1811 /* Instruction is BCx */
1813 {
1814 bfd_vma target;
1816 /* This branch is predicted as "normal".
1817 If this is a forward branch, it is problematic. */
1821 /* Convert to abs. */
1824 {
1825 /* Set the prediction bit. */
1828 }
1829 }
1830 }
1832 {
1833 /* Instruction is BCCTRx. */
1835 {
1836 /* This branch is predicted as not-taken.
1837 If this is a forward branch, it is problematic.
1838 Since we can't tell statically if it will branch
1839 forward, always set the prediction bit. */
1842 }
1843 }
1845 {
1846 /* Instruction is BCLRx */
1848 {
1849 /* This branch is predicted as not-taken.
1850 If this is a forward branch, it is problematic.
1851 Since we can't tell statically if it will branch
1852 forward, always set the prediction bit. */
1855 }
1856 }
1857 #undef BO0
1858 #undef BO2
1859 #undef BO4
1861 {
1864 }
1865 }
1866 }
1868 {
1871 }
1872 }
1875 {
1878 }
1881 {
1884 }
1887 {
1890 else
1891 {
1892 /* Cache the section contents for elf_link_input_bfd. */
1894 }
1896 }
1900 error_return:
1908 }
1909 \f
1913 bfd_reloc_code_real_type code;
1914 {
1918 /* Initialize howto table if needed. */
1922 {
2007 }
2010 };
2012 /* Set the howto pointer for a PowerPC ELF reloc. */
2014 static void
2019 {
2021 /* Initialize howto table if needed. */
2026 }
2028 /* Handle the R_PPC_ADDR16_HA reloc. */
2030 static bfd_reloc_status_type
2036 PTR data ATTRIBUTE_UNUSED;
2040 {
2041 bfd_vma relocation;
2044 {
2047 }
2054 else
2064 }
2066 static bfd_reloc_status_type
2072 PTR data;
2076 {
2077 /* If this is a relocatable link (output_bfd test tells us), just
2078 call the generic function. Any adjustment will be done at final
2079 link time. */
2085 {
2090 }
2092 }
2094 /* Fix bad default arch selected for a 32 bit input bfd when the
2095 default is 64 bit. */
2097 static bfd_boolean
2100 {
2102 {
2106 {
2107 /* Relies on arch after 64 bit default being 32 bit default. */
2110 }
2111 }
2113 }
2115 /* Function to set whether a module needs the -mrelocatable bit set. */
2117 static bfd_boolean
2120 flagword flags;
2121 {
2128 }
2130 /* Merge backend specific data from an object file to the output
2131 object file when linking. */
2133 static bfd_boolean
2137 {
2138 flagword old_flags;
2139 flagword new_flags;
2140 bfd_boolean error;
2142 /* Check if we have the same endianess. */
2153 {
2154 /* First call, no flags set. */
2157 }
2159 /* Compatible flags are ok. */
2161 ;
2163 /* Incompatible flags. */
2164 else
2165 {
2166 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
2167 to be linked with either. */
2171 {
2176 }
2179 {
2184 }
2186 /* The output is -mrelocatable-lib iff both the input files are. */
2190 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
2191 but each input file is either -mrelocatable or -mrelocatable-lib. */
2197 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
2198 any module uses it. */
2204 /* Warn about any other mismatches. */
2206 {
2211 }
2214 {
2217 }
2218 }
2221 }
2222 \f
2223 /* Handle a PowerPC specific section when reading an object file. This
2224 is called when elfcode.h finds a section with an unknown type. */
2226 static bfd_boolean
2231 {
2233 flagword flags;
2248 }
2249 \f
2250 /* Set up any other section flags and such that may be necessary. */
2252 static bfd_boolean
2257 {
2265 }
2266 \f
2267 /* Create a special linker section */
2273 {
2277 /* Record the first bfd section that needs the special section. */
2281 /* If this is the first time, create the section. */
2284 {
2285 elf_linker_section_t defaults;
2293 /* Both of these sections are (technically) created by the user
2294 putting data in them, so they shouldn't be marked
2295 SEC_LINKER_CREATED.
2297 The linker creates them so it has somewhere to attach their
2298 respective symbols. In fact, if they were empty it would
2299 be OK to leave the symbol set to 0 (or any random number), because
2300 the appropriate register should never be used. */
2305 {
2330 }
2333 }
2336 }
2337 \f
2338 /* If we have a non-zero sized .sbss2 or .PPC.EMB.sbss0 sections, we
2339 need to bump up the number of section headers. */
2341 static int
2344 {
2363 }
2365 /* Modify the segment map if needed. */
2367 static bfd_boolean
2370 {
2372 }
2373 \f
2374 /* The powerpc .got has a blrl instruction in it. Mark it executable. */
2376 static bfd_boolean
2380 {
2383 flagword flags;
2408 }
2410 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2411 to output sections (just like _bfd_elf_create_dynamic_sections has
2412 to create .dynbss and .rela.bss). */
2414 static bfd_boolean
2418 {
2421 flagword flags;
2440 {
2447 }
2456 }
2458 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
2459 copying dynamic variables from a shared lib into an app's dynbss
2460 section, and instead use a dynamic relocation to point into the
2461 shared lib. */
2462 #define ELIMINATE_COPY_RELOCS 1
2464 /* Adjust a symbol defined by a dynamic object and referenced by a
2465 regular object. The current definition is in some section of the
2466 dynamic object, but we're not including those sections. We have to
2467 change the definition to something the rest of the link can
2468 understand. */
2470 static bfd_boolean
2474 {
2479 #ifdef DEBUG
2482 #endif
2484 /* Make sure we know what is going on here. */
2496 /* Deal with function syms. */
2499 {
2500 /* Clear procedure linkage table information for any symbol that
2501 won't need a .plt entry. */
2505 {
2506 /* A PLT entry is not required/allowed when:
2508 1. We are not using ld.so; because then the PLT entry
2509 can't be set up, so we can't use one.
2511 2. We know for certain that a call to this symbol
2512 will go to this object.
2514 3. GC has rendered the entry unused. */
2517 }
2519 }
2520 else
2523 /* If this is a weak symbol, and there is a real definition, the
2524 processor independent code will have arranged for us to see the
2525 real definition first, and we can just use the same value. */
2527 {
2533 h->elf_link_hash_flags
2537 }
2539 /* This is a reference to a symbol defined by a dynamic object which
2540 is not a function. */
2542 /* If we are creating a shared library, we must presume that the
2543 only references to the symbol are via the global offset table.
2544 For such cases we need not do anything here; the relocations will
2545 be handled correctly by relocate_section. */
2549 /* If there are no references to this symbol that do not use the
2550 GOT, we don't need to generate a copy reloc. */
2555 {
2558 {
2562 }
2564 /* If we didn't find any dynamic relocs in read-only sections, then
2565 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2567 {
2570 }
2571 }
2573 /* We must allocate the symbol in our .dynbss section, which will
2574 become part of the .bss section of the executable. There will be
2575 an entry for this symbol in the .dynsym section. The dynamic
2576 object will contain position independent code, so all references
2577 from the dynamic object to this symbol will go through the global
2578 offset table. The dynamic linker will use the .dynsym entry to
2579 determine the address it must put in the global offset table, so
2580 both the dynamic object and the regular object will refer to the
2581 same memory location for the variable.
2583 Of course, if the symbol is sufficiently small, we must instead
2584 allocate it in .sbss. FIXME: It would be better to do this if and
2585 only if there were actually SDAREL relocs for that symbol. */
2589 else
2593 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
2594 copy the initial value out of the dynamic object and into the
2595 runtime process image. We need to remember the offset into the
2596 .rela.bss section we are going to use. */
2598 {
2603 else
2608 }
2610 /* We need to figure out the alignment required for this symbol. I
2611 have no idea how ELF linkers handle this. */
2616 /* Apply the required alignment. */
2620 {
2623 }
2625 /* Define the symbol as being at this point in the section. */
2629 /* Increment the section size to make room for the symbol. */
2633 }
2634 \f
2635 /* This is the condition under which finish_dynamic_symbol will be
2636 called from elflink.h. If elflink.h doesn't call our
2637 finish_dynamic_symbol routine, we'll need to do something about
2638 initializing any .plt and .got entries in relocate_section. */
2639 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2640 ((DYN) \
2641 && ((SHARED) \
2642 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
2643 && ((H)->dynindx != -1 \
2644 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
2646 /* Of those relocs that might be copied as dynamic relocs, this macro
2647 selects those that must be copied when linking a shared library,
2648 even when the symbol is local. */
2650 #define MUST_BE_DYN_RELOC(RTYPE) \
2651 ((RTYPE) != R_PPC_REL24 \
2652 && (RTYPE) != R_PPC_REL14 \
2653 && (RTYPE) != R_PPC_REL14_BRTAKEN \
2654 && (RTYPE) != R_PPC_REL14_BRNTAKEN \
2655 && (RTYPE) != R_PPC_REL32)
2657 /* Allocate space in associated reloc sections for dynamic relocs. */
2659 static bfd_boolean
2662 PTR inf;
2663 {
2673 /* When warning symbols are created, they **replace** the "real"
2674 entry in the hash table, thus we never get to see the real
2675 symbol in a hash traversal. So look at it now. */
2681 {
2682 /* Make sure this symbol is output as a dynamic symbol. */
2685 {
2688 }
2692 {
2695 /* If this is the first .plt entry, make room for the special
2696 first entry. */
2700 /* The PowerPC PLT is actually composed of two parts, the
2701 first part is 2 words (for a load and a jump), and then
2702 there is a remaining word available at the end. */
2704 + (PLT_SLOT_SIZE
2708 /* If this symbol is not defined in a regular file, and we
2709 are not generating a shared library, then set the symbol
2710 to this location in the .plt. This is required to make
2711 function pointers compare as equal between the normal
2712 executable and the shared library. */
2715 {
2718 }
2720 /* Make room for this entry. After the 8192nd entry, room
2721 for two entries is allocated. */
2727 /* We also need to make an entry in the .rela.plt section. */
2729 }
2730 else
2731 {
2734 }
2735 }
2736 else
2737 {
2740 }
2744 {
2745 /* Make sure this symbol is output as a dynamic symbol. */
2748 {
2751 }
2755 /* If just an LD reloc, we'll just use htab->tlsld_got.offset. */
2757 else
2758 {
2759 bfd_boolean dyn;
2762 {
2771 }
2772 else
2777 {
2778 /* All the entries we allocated need relocs. */
2782 /* Except LD only needs one. */
2785 }
2786 }
2787 }
2788 else
2794 /* In the shared -Bsymbolic case, discard space allocated for
2795 dynamic pc-relative relocs against symbols which turn out to be
2796 defined in regular objects. For the normal shared case, discard
2797 space for relocs that have become local due to symbol visibility
2798 changes. */
2800 {
2804 {
2808 {
2813 else
2815 }
2816 }
2817 }
2819 {
2820 /* For the non-shared case, discard space for relocs against
2821 symbols which turn out to need copy relocs or are not
2822 dynamic. */
2827 {
2828 /* Make sure this symbol is output as a dynamic symbol.
2829 Undefined weak syms won't yet be marked as dynamic. */
2832 {
2835 }
2837 /* If that succeeded, we know we'll be keeping all the
2838 relocs. */
2841 }
2845 keep: ;
2846 }
2848 /* Finally, allocate space. */
2850 {
2853 }
2856 }
2858 /* Find any dynamic relocs that apply to read-only sections. */
2860 static bfd_boolean
2863 PTR info;
2864 {
2874 {
2880 {
2883 /* Not an error, just cut short the traversal. */
2885 }
2886 }
2888 }
2890 /* Set the sizes of the dynamic sections. */
2892 static bfd_boolean
2896 {
2899 bfd_boolean relocs;
2902 #ifdef DEBUG
2904 #endif
2910 {
2911 /* Set the contents of the .interp section to the interpreter. */
2913 {
2918 }
2919 }
2922 {
2927 }
2928 else
2931 /* Set up .got offsets for local syms, and space for local dynamic
2932 relocs. */
2934 {
2938 bfd_size_type locsymcount;
2946 {
2953 {
2956 {
2957 /* Input section has been discarded, either because
2958 it is a copy of a linkonce section or due to
2959 linker script /DISCARD/, so we'll be discarding
2960 the relocs too. */
2961 }
2963 {
2970 }
2971 }
2972 }
2986 {
2988 {
2989 /* If just an LD reloc, we'll just use
2990 htab->tlsld_got.offset. */
2992 {
2997 }
2999 }
3000 else
3001 {
3004 {
3011 }
3012 else
3017 }
3018 }
3019 else
3021 }
3023 /* Allocate space for global sym dynamic relocs. */
3026 /* We've now determined the sizes of the various dynamic sections.
3027 Allocate memory for them. */
3030 {
3038 {
3039 /* Strip this section if we don't need it; see the
3040 comment below. */
3041 }
3043 {
3045 {
3046 /* If we don't need this section, strip it from the
3047 output file. This is mostly to handle .rela.bss and
3048 .rela.plt. We must create both sections in
3049 create_dynamic_sections, because they must be created
3050 before the linker maps input sections to output
3051 sections. The linker does that before
3052 adjust_dynamic_symbol is called, and it is that
3053 function which decides whether anything needs to go
3054 into these sections. */
3055 }
3056 else
3057 {
3058 /* Remember whether there are any relocation sections. */
3061 /* We use the reloc_count field as a counter if we need
3062 to copy relocs into the output file. */
3064 }
3065 }
3066 else
3067 {
3068 /* It's not one of our sections, so don't allocate space. */
3070 }
3073 {
3076 }
3078 /* Allocate memory for the section contents. */
3082 }
3085 {
3086 /* Add some entries to the .dynamic section. We fill in the
3087 values later, in ppc_elf_finish_dynamic_sections, but we
3088 must add the entries now so that we get the correct size for
3089 the .dynamic section. The DT_DEBUG entry is filled in by the
3090 dynamic linker and used by the debugger. */
3091 #define add_dynamic_entry(TAG, VAL) \
3092 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
3095 {
3098 }
3101 {
3107 }
3110 {
3115 }
3117 /* If any dynamic relocs apply to a read-only section, then we
3118 need a DT_TEXTREL entry. */
3124 {
3127 }
3128 }
3129 #undef add_dynamic_entry
3132 }
3133 \f
3134 static bfd_boolean
3140 {
3145 {
3153 }
3159 }
3161 static void
3165 {
3171 }
3173 /* Look through the relocs for a section during the first phase, and
3174 allocate space in the global offset table or procedure linkage
3175 table. */
3177 static bfd_boolean
3183 {
3194 #ifdef DEBUG
3198 #endif
3200 /* Create the linker generated sections all the time so that the
3201 special symbols are created. */
3205 {
3209 LINKER_SECTION_SDATA);
3212 }
3215 {
3219 LINKER_SECTION_SDATA2);
3222 }
3230 {
3239 else
3242 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
3243 This shows up in particular in an R_PPC_ADDR32 in the eabi
3244 startup code. */
3246 {
3248 {
3253 }
3254 }
3258 {
3288 dogottls:
3290 /* Fall thru */
3292 /* GOT16 relocations */
3297 /* This symbol requires a global offset table entry. */
3299 {
3304 }
3306 {
3309 }
3310 else
3311 /* This is a global offset table entry for a local symbol. */
3316 /* Indirect .sdata relocation. */
3319 {
3322 }
3328 /* Indirect .sdata2 relocation. */
3331 {
3334 }
3350 {
3353 }
3362 #ifdef DEBUG
3364 #endif
3365 /* This symbol requires a procedure linkage table entry. We
3366 actually build the entry in finish_dynamic_symbol,
3367 because this might be a case of linking PIC code without
3368 linking in any dynamic objects, in which case we don't
3369 need to generate a procedure linkage table after all. */
3372 {
3373 /* It does not make sense to have a procedure linkage
3374 table entry for a local symbol. */
3377 }
3383 /* The following relocations don't need to propagate the
3384 relocation if linking a shared object since they are
3385 section relative. */
3397 /* This are just markers. */
3404 /* These should only appear in dynamic objects. */
3411 /* These aren't handled yet. We'll report an error later. */
3420 /* This refers only to functions defined in the shared library. */
3424 /* This relocation describes the C++ object vtable hierarchy.
3425 Reconstruct it for later use during GC. */
3431 /* This relocation describes which C++ vtable entries are actually
3432 used. Record for later use during GC. */
3438 /* We shouldn't really be seeing these. */
3444 /* Nor these. */
3457 /* When creating a shared object, we must copy these
3458 relocs into the output file. We create a reloc
3459 section in dynobj and make room for the reloc. */
3468 /* fall through */
3482 {
3483 /* We may need a plt entry if the symbol turns out to be
3484 a function defined in a dynamic object. */
3487 /* We may need a copy reloc too. */
3489 }
3491 dodyn:
3492 /* If we are creating a shared library, and this is a reloc
3493 against a global symbol, or a non PC relative reloc
3494 against a local symbol, then we need to copy the reloc
3495 into the shared library. However, if we are linking with
3496 -Bsymbolic, we do not need to copy a reloc against a
3497 global symbol which is defined in an object we are
3498 including in the link (i.e., DEF_REGULAR is set). At
3499 this point we have not seen all the input files, so it is
3500 possible that DEF_REGULAR is not set now but will be set
3501 later (it is never cleared). In case of a weak definition,
3502 DEF_REGULAR may be cleared later by a strong definition in
3503 a shared library. We account for that possibility below by
3504 storing information in the dyn_relocs field of the hash
3505 table entry. A similar situation occurs when creating
3506 shared libraries and symbol visibility changes render the
3507 symbol local.
3509 If on the other hand, we are creating an executable, we
3510 may need to keep relocations for symbols satisfied by a
3511 dynamic library if we manage to avoid copy relocs for the
3512 symbol. */
3520 || (ELIMINATE_COPY_RELOCS
3527 {
3531 #ifdef DEBUG
3535 #endif
3537 {
3540 name = (bfd_elf_string_from_elf_section
3553 {
3554 flagword flags;
3567 }
3569 }
3571 /* If this is a global symbol, we count the number of
3572 relocations we need for this symbol. */
3574 {
3576 }
3577 else
3578 {
3579 /* Track dynamic relocs needed for local syms too.
3580 We really need local syms available to do this
3581 easily. Oh well. */
3591 }
3595 {
3605 }
3610 }
3613 }
3614 }
3617 }
3619 /* Return the section that should be marked against GC for a given
3620 relocation. */
3629 {
3631 {
3633 {
3640 {
3650 }
3651 }
3652 }
3653 else
3657 }
3659 /* Update the got, plt and dynamic reloc reference counts for the
3660 section being removed. */
3662 static bfd_boolean
3668 {
3684 {
3691 {
3700 {
3701 /* Everything must go for SEC. */
3704 }
3705 }
3709 {
3715 /* Fall thru */
3734 {
3737 }
3739 {
3742 }
3753 /* Fall thru */
3772 {
3775 }
3780 }
3781 }
3783 }
3785 /* Set htab->tls_sec and htab->tls_get_addr. */
3787 bfd_boolean
3791 {
3806 }
3808 /* Run through all the TLS relocs looking for optimization
3809 opportunities. */
3811 bfd_boolean
3815 {
3825 {
3831 {
3835 /* Read the relocations. */
3845 {
3851 bfd_boolean is_local;
3855 {
3863 }
3872 {
3877 /* These relocs should never be against a symbol
3878 defined in a shared lib. Leave them alone if
3879 that turns out to be the case. */
3885 /* LD -> LE */
3896 /* GD -> LE */
3898 else
3899 /* GD -> IE */
3911 {
3912 /* IE -> LE */
3916 }
3917 else
3927 {
3930 }
3937 }
3940 {
3942 {
3943 /* We managed to get rid of a got entry. */
3946 }
3948 }
3949 else
3950 {
3956 {
3963 {
3967 }
3968 }
3974 {
3975 /* We managed to get rid of a got entry. */
3978 }
3981 }
3985 }
3989 }
3993 {
3996 else
3998 }
3999 }
4001 }
4002 \f
4003 /* Hook called by the linker routine which adds symbols from an object
4004 file. We use it to put .comm items in .sbss, and not .bss. */
4006 static bfd_boolean
4015 {
4020 {
4021 /* Common symbols less than or equal to -G nn bytes are automatically
4022 put into .sdata. */
4023 elf_linker_section_t *sdata
4027 {
4028 bfd_size_type amt;
4030 /* We don't go through bfd_make_section, because we don't
4031 want to attach this common section to DYNOBJ. The linker
4032 will move the symbols to the appropriate output section
4033 when it defines common symbols. */
4053 }
4057 }
4060 }
4061 \f
4062 /* Finish up dynamic symbol handling. We set the contents of various
4063 dynamic sections here. */
4065 static bfd_boolean
4071 {
4074 #ifdef DEBUG
4077 #endif
4083 {
4084 Elf_Internal_Rela rela;
4086 bfd_vma reloc_index;
4088 #ifdef DEBUG
4090 #endif
4092 /* This symbol has an entry in the procedure linkage table. Set
4093 it up. */
4098 /* We don't need to fill in the .plt. The ppc dynamic linker
4099 will fill it in. */
4101 /* Fill in the entry in the .rela.plt section. */
4116 {
4117 /* Mark the symbol as undefined, rather than as defined in
4118 the .plt section. Leave the value alone. */
4120 /* If the symbol is weak, we do need to clear the value.
4121 Otherwise, the PLT entry would provide a definition for
4122 the symbol even if the symbol wasn't defined anywhere,
4123 and so the symbol would never be NULL. */
4127 }
4128 }
4131 {
4133 Elf_Internal_Rela rela;
4136 /* This symbols needs a copy reloc. Set it up. */
4138 #ifdef DEBUG
4140 #endif
4146 else
4157 }
4159 #ifdef DEBUG
4161 #endif
4163 /* Mark some specially defined symbols as absolute. */
4170 }
4171 \f
4172 /* Finish up the dynamic sections. */
4174 static bfd_boolean
4178 {
4182 #ifdef DEBUG
4184 #endif
4190 {
4198 {
4199 Elf_Internal_Dyn dyn;
4205 {
4222 }
4225 }
4226 }
4228 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
4229 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
4231 {
4237 else
4243 }
4246 }
4247 \f
4248 /* The RELOCATE_SECTION function is called by the ELF backend linker
4249 to handle the relocations for a section.
4251 The relocs are always passed as Rela structures; if the section
4252 actually uses Rel structures, the r_addend field will always be
4253 zero.
4255 This function is responsible for adjust the section contents as
4256 necessary, and (if using Rela relocs and generating a
4257 relocateable output file) adjusting the reloc addend as
4258 necessary.
4260 This function does not have to worry about setting the reloc
4261 address or the reloc symbol index.
4263 LOCAL_SYMS is a pointer to the swapped in local symbols.
4265 LOCAL_SECTIONS is an array giving the section in the input file
4266 corresponding to the st_shndx field of each local symbol.
4268 The global hash table entry for the global symbols can be found
4269 via elf_sym_hashes (input_bfd).
4271 When generating relocateable output, this function must handle
4272 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
4273 going to be the section symbol corresponding to the output
4274 section, which means that the addend must be adjusted
4275 accordingly. */
4277 static bfd_boolean
4288 {
4294 Elf_Internal_Rela outrel;
4300 #ifdef DEBUG
4306 #endif
4312 /* Initialize howto table if needed. */
4322 {
4324 bfd_vma addend;
4325 bfd_reloc_status_type r;
4332 bfd_vma relocation;
4334 bfd_boolean unresolved_reloc;
4335 bfd_boolean warned;
4346 {
4352 }
4353 else
4354 {
4364 {
4366 /* Set a flag that will be cleared later if we find a
4367 relocation value for this symbol. output_section
4368 is typically NULL for symbols satisfied by a shared
4369 library. */
4372 else
4376 }
4378 ;
4382 ;
4383 else
4384 {
4392 }
4393 }
4395 /* TLS optimizations. Replace instruction sequences and relocs
4396 based on information we collected in tls_optimize. We edit
4397 RELOCS so that --emit-relocs will output something sensible
4398 for the final instruction stream. */
4402 {
4406 {
4410 }
4411 }
4413 /* Ensure reloc mapping code below stays sane. */
4424 {
4432 {
4433 bfd_vma insn;
4440 }
4446 {
4455 else
4458 /* add -> addi. */
4464 /* load and store indexed -> dform. */
4468 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
4473 /* lwax -> lwa. */
4475 else
4481 /* Was PPC_TLS which sits on insn boundary, now
4482 PPC_TPREL16_LO which is at insn+2. */
4484 }
4497 {
4498 tls_gdld_hi:
4502 else
4503 {
4507 }
4509 }
4522 {
4523 tls_get_addr_check:
4525 {
4530 bfd_vma offset;
4532 /* The next instruction should be a call to
4533 __tls_get_addr. Peek at the reloc to be sure. */
4534 r_type2
4552 /* OK, it checks out. Replace the call. */
4557 {
4558 /* IE */
4566 }
4567 else
4568 {
4569 /* LE */
4573 {
4574 /* Was an LD reloc. */
4578 }
4582 R_PPC_TPREL16_LO);
4584 }
4588 {
4589 /* We changed the symbol on an LD reloc. Start over
4590 in order to get h, sym, sec etc. right. */
4591 rel--;
4593 }
4594 }
4595 }
4597 }
4599 /* Handle other relocations that tweak non-addend part of insn. */
4602 {
4606 /* Branch taken prediction relocations. */
4610 /* Fall thru */
4612 /* Branch not taken predicition relocations. */
4623 /* Invert 'y' bit if not the default. */
4629 }
4637 {
4654 /* GOT16 relocations. Like an ADDR16 using the symbol's
4655 address in the GOT as relocation value instead of the
4656 symbol's value itself. Also, create a GOT entry for the
4657 symbol and put the symbol value there. */
4690 dogot:
4691 {
4692 /* Relocation is to the entry for this symbol in the global
4693 offset table. */
4694 bfd_vma off;
4707 {
4708 bfd_boolean dyn;
4713 /* This is actually a static link, or it is a
4714 -Bsymbolic link and the symbol is defined
4715 locally, or the symbol was forced to be local
4716 because of a version file. */
4717 ;
4718 else
4719 {
4722 }
4724 }
4725 else
4726 {
4730 }
4732 /* The offset must always be a multiple of 4. We use the
4733 least significant bit to record whether we have already
4734 processed this entry. */
4738 else
4739 {
4751 /* We might have multiple got entries for this sym.
4752 Initialize them all. */
4753 do
4754 {
4758 {
4761 }
4763 {
4766 }
4768 {
4771 }
4773 {
4776 }
4778 /* Generate relocs for the dynamic linker. */
4780 {
4786 {
4789 {
4796 outrel.r_info
4798 }
4799 }
4806 else
4809 {
4813 }
4818 }
4820 /* Init the .got section contents if we're not
4821 emitting a reloc. */
4822 else
4823 {
4829 {
4835 {
4839 }
4840 }
4843 }
4848 }
4853 }
4859 {
4861 {
4868 {
4872 {
4875 }
4876 }
4877 }
4878 }
4882 /* Addends on got relocations don't make much sense.
4883 x+off@got is actually x@got+off, and since the got is
4884 generated by a hash table traversal, the value in the
4885 got at entry m+n bears little relation to the entry m. */
4893 sym_name);
4894 }
4897 /* Relocations that need no special processing. */
4899 /* It makes no sense to point a local relocation
4900 at a symbol not in this object. */
4902 {
4905 input_bfd,
4906 input_section,
4908 TRUE))
4911 }
4921 /* Relocations that may need to be propagated if this is a shared
4922 object. */
4928 /* The TPREL16 relocs shouldn't really be used in shared
4929 libs as they will result in DT_TEXTREL being set, but
4930 support them anyway. */
4951 /* If these relocations are not to a named symbol, they can be
4952 handled right here, no need to bother the dynamic linker. */
4957 /* fall through */
4959 /* Relocations that always need to be propagated if this is a shared
4960 object. */
4972 /* r_symndx will be zero only for relocs against symbols
4973 from removed linkonce sections, or sections discarded by
4974 a linker script. */
4975 dodyn:
4978 /* Fall thru. */
4987 || (ELIMINATE_COPY_RELOCS
4995 {
4998 #ifdef DEBUG
5002 #endif
5004 /* When generating a shared object, these relocations
5005 are copied into the output file to be resolved at run
5006 time. */
5008 {
5011 name = (bfd_elf_string_from_elf_section
5020 input_section),
5025 }
5042 {
5046 }
5047 else
5048 {
5053 else
5054 {
5060 {
5063 }
5064 else
5065 {
5068 /* We are turning this relocation into one
5069 against a section symbol. It would be
5070 proper to subtract the symbol's value,
5071 osec->vma, from the emitted reloc addend,
5072 but ld.so expects buggy relocs. */
5076 #ifdef DEBUG
5078 {
5082 }
5083 #endif
5084 }
5087 }
5088 }
5097 /* This reloc will be computed at runtime. We clear the memory
5098 so that it contains predictable value. */
5102 {
5106 }
5107 }
5110 /* Indirect .sdata relocation. */
5113 relocation
5117 R_PPC_RELATIVE);
5120 /* Indirect .sdata2 relocation. */
5123 relocation
5127 R_PPC_RELATIVE);
5130 /* Handle the TOC16 reloc. We want to use the offset within the .got
5131 section, not the actual VMA. This is appropriate when generating
5132 an embedded ELF object, for which the .got section acts like the
5133 AIX .toc section. */
5144 /* Relocation is to the entry for this symbol in the
5145 procedure linkage table. */
5150 {
5151 /* We didn't make a PLT entry for this symbol. This
5152 happens when statically linking PIC code, or when
5153 using -Bsymbolic. */
5155 }
5163 /* Relocate against _SDA_BASE_. */
5165 {
5175 {
5176 (*_bfd_error_handler) (_("%s: the target (%s) of a %s relocation is in the wrong output section (%s)"),
5178 sym_name,
5180 name);
5181 }
5186 }
5189 /* Relocate against _SDA2_BASE_. */
5191 {
5199 {
5200 (*_bfd_error_handler) (_("%s: the target (%s) of a %s relocation is in the wrong output section (%s)"),
5202 sym_name,
5204 name);
5209 }
5214 }
5217 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
5220 {
5231 {
5237 }
5241 {
5247 }
5251 {
5253 }
5255 else
5256 {
5257 (*_bfd_error_handler) (_("%s: the target (%s) of a %s relocation is in the wrong output section (%s)"),
5259 sym_name,
5261 name);
5266 }
5273 }
5274 }
5277 /* Relocate against the beginning of the section. */
5286 /* Negative relocations. */
5314 sym_name);
5319 }
5321 /* Do any further special processing. */
5323 {
5339 /* It's just possible that this symbol is a weak symbol
5340 that's not actually defined anywhere. In that case,
5341 'sec' would be NULL, and we should leave the symbol
5342 alone (it will be set to zero elsewhere in the link). */
5344 /* Add 0x10000 if sign bit in 0:15 is set.
5345 Bits 0:15 are not used. */
5348 }
5350 #ifdef DEBUG
5351 fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n",
5354 sym_name,
5355 r_symndx,
5358 #endif
5363 {
5370 sym_name);
5372 }
5375 input_bfd,
5376 input_section,
5377 contents,
5379 relocation,
5380 addend);
5383 {
5387 {
5393 {
5394 /* Assume this is a call protected by other code that
5395 detect the symbol is undefined. If this is the case,
5396 we can safely ignore the overflow. If not, the
5397 program is hosed anyway, and a little warning isn't
5398 going to help. */
5401 }
5404 sym_name,
5407 input_bfd,
5408 input_section,
5411 }
5412 else
5413 {
5420 }
5421 }
5422 }
5424 #ifdef DEBUG
5426 #endif
5429 }
5431 static enum elf_reloc_type_class
5434 {
5436 {
5447 }
5448 }
5449 \f
5450 /* Support for core dump NOTE sections. */
5452 static bfd_boolean
5456 {
5461 {
5466 /* pr_cursig */
5469 /* pr_pid */
5472 /* pr_reg */
5477 }
5479 /* Make a ".reg/999" section. */
5482 }
5484 static bfd_boolean
5488 {
5490 {
5499 }
5501 /* Note that for some reason, a spurious space is tacked
5502 onto the end of the args in some (at least one anyway)
5503 implementations, so strip it off if it exists. */
5505 {
5511 }
5514 }
5515 \f
5516 /* Very simple linked list structure for recording apuinfo values. */
5518 {
5521 }
5522 apuinfo_list;
5536 extern bfd_boolean ppc_elf_write_section
5540 static void
5542 {
5544 }
5546 static void
5549 {
5553 {
5557 }
5566 }
5568 static unsigned
5570 {
5575 entry;
5580 }
5585 {
5591 ;
5594 }
5596 static void
5598 {
5602 {
5606 }
5609 }
5614 /* Scan the input BFDs and create a linked list of
5615 the APUinfo values that will need to be emitted. */
5617 void
5621 {
5626 bfd_size_type output_section_size;
5636 /* Scan the input bfds, looking for apuinfo sections. */
5641 {
5644 {
5647 }
5648 }
5650 /* We need at least one input sections
5651 in order to make merging worthwhile. */
5655 /* Just make sure that the output section exists as well. */
5660 /* Allocate a buffer for the contents of the input sections. */
5668 /* Read in the input sections contents. */
5670 {
5680 {
5683 }
5687 {
5690 }
5692 /* Process the contents of the section. */
5696 /* Verify the contents of the header. Note - we have to
5697 extract the values this way in order to allow for a
5698 host whose endian-ness is different from the target. */
5710 /* Get the number of apuinfo entries. */
5715 /* Make sure that we do not run off the end of the section. */
5719 /* Scan the apuinfo section, building a list of apuinfo numbers. */
5723 /* Update the offset. */
5725 }
5729 /* Compute the size of the output section. */
5739 fail:
5745 }
5748 /* Prevent the output section from accumulating the input sections'
5749 contents. We have already stored this in our linked list structure. */
5751 bfd_boolean
5756 {
5759 }
5762 /* Finally we can generate the output section. */
5764 void
5767 bfd_boolean linker ATTRIBUTE_UNUSED;
5768 {
5773 bfd_size_type length;
5788 {
5792 }
5794 /* Create the apuinfo header. */
5803 {
5806 }
5817 }
5818 \f
5819 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
5821 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
5823 #define ELF_ARCH bfd_arch_powerpc
5824 #define ELF_MACHINE_CODE EM_PPC
5825 #define ELF_MAXPAGESIZE 0x10000
5826 #define elf_info_to_howto ppc_elf_info_to_howto
5828 #ifdef EM_CYGNUS_POWERPC
5829 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
5830 #endif
5832 #ifdef EM_PPC_OLD
5833 #define ELF_MACHINE_ALT2 EM_PPC_OLD
5834 #endif
5836 #define elf_backend_plt_not_loaded 1
5837 #define elf_backend_got_symbol_offset 4
5838 #define elf_backend_can_gc_sections 1
5839 #define elf_backend_can_refcount 1
5840 #define elf_backend_got_header_size 12
5841 #define elf_backend_plt_header_size PLT_INITIAL_ENTRY_SIZE
5842 #define elf_backend_rela_normal 1
5844 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
5845 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
5846 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
5847 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
5848 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create
5850 #define elf_backend_object_p ppc_elf_object_p
5851 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
5852 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
5853 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
5854 #define elf_backend_relocate_section ppc_elf_relocate_section
5855 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
5856 #define elf_backend_check_relocs ppc_elf_check_relocs
5857 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol
5858 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
5859 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
5860 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
5861 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
5862 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
5863 #define elf_backend_fake_sections ppc_elf_fake_sections
5864 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
5865 #define elf_backend_modify_segment_map ppc_elf_modify_segment_map
5866 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
5867 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
5868 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
5869 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing
5870 #define elf_backend_final_write_processing ppc_elf_final_write_processing
5871 #define elf_backend_write_section ppc_elf_write_section