| blob | 9947af855fee8d996ce6ae2cebf4347ccc39a937 |
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? */
151 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
152 ((! INFO->shared \
153 || INFO->symbolic \
154 || H->dynindx == -1 \
155 || ELF_ST_VISIBILITY (H->other) == STV_INTERNAL \
156 || ELF_ST_VISIBILITY (H->other) == STV_HIDDEN) \
157 && (H->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
159 /* Will _calls_ to this symbol always call the version in this object? */
160 #define SYMBOL_CALLS_LOCAL(INFO, H) \
161 ((! INFO->shared \
162 || INFO->symbolic \
163 || H->dynindx == -1 \
164 || ELF_ST_VISIBILITY (H->other) != STV_DEFAULT) \
165 && (H->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
166 \f
167 /* The PPC linker needs to keep track of the number of relocs that it
168 decides to copy as dynamic relocs in check_relocs for each symbol.
169 This is so that it can later discard them if they are found to be
170 unnecessary. We store the information in a field extending the
171 regular ELF linker hash table. */
173 struct ppc_elf_dyn_relocs
174 {
177 /* The input section of the reloc. */
180 /* Total number of relocs copied for the input section. */
181 bfd_size_type count;
183 /* Number of pc-relative relocs copied for the input section. */
184 bfd_size_type pc_count;
185 };
187 /* PPC ELF linker hash entry. */
189 struct ppc_elf_link_hash_entry
190 {
193 /* Track dynamic relocs copied for this symbol. */
196 /* Contexts in which symbol is used in the GOT (or TOC).
197 TLS_GD .. TLS_EXPLICIT bits are or'd into the mask as the
198 corresponding relocs are encountered during check_relocs.
199 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
200 indicate the corresponding GOT entry type is not needed. */
208 };
210 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent))
212 /* PPC ELF linker hash table. */
214 struct ppc_elf_link_hash_table
215 {
218 /* Short-cuts to get to dynamic linker sections. */
230 /* Short-cut to first output tls section. */
233 /* Shortcut to .__tls_get_addr. */
236 /* TLS local dynamic got entry handling. */
238 bfd_signed_vma refcount;
239 bfd_vma offset;
242 /* Small local sym to section mapping cache. */
244 };
246 /* Get the PPC ELF linker hash table from a link_info structure. */
248 #define ppc_elf_hash_table(p) \
249 ((struct ppc_elf_link_hash_table *) (p)->hash)
251 /* Create an entry in a PPC ELF linker hash table. */
258 {
259 /* Allocate the structure if it has not already been allocated by a
260 subclass. */
262 {
267 }
269 /* Call the allocation method of the superclass. */
272 {
275 }
278 }
280 /* Create a PPC ELF linker hash table. */
285 {
294 ppc_elf_link_hash_newfunc))
295 {
298 }
316 }
318 /* Copy the extra info we tack onto an elf_link_hash_entry. */
320 static void
324 {
331 {
333 {
340 /* Add reloc counts against the weak sym to the strong sym
341 list. Merge any entries against the same section. */
343 {
348 {
353 }
356 }
358 }
362 }
367 }
368 \f
372 /* This reloc does nothing. */
387 /* A standard 32 bit relocation. */
402 /* An absolute 26 bit branch; the lower two bits must be zero.
403 FIXME: we don't check that, we just clear them. */
418 /* A standard 16 bit relocation. */
433 /* A 16 bit relocation without overflow. */
448 /* The high order 16 bits of an address. */
463 /* The high order 16 bits of an address, plus 1 if the contents of
464 the low 16 bits, treated as a signed number, is negative. */
479 /* An absolute 16 bit branch; the lower two bits must be zero.
480 FIXME: we don't check that, we just clear them. */
495 /* An absolute 16 bit branch, for which bit 10 should be set to
496 indicate that the branch is expected to be taken. The lower two
497 bits must be zero. */
512 /* An absolute 16 bit branch, for which bit 10 should be set to
513 indicate that the branch is not expected to be taken. The lower
514 two bits must be zero. */
529 /* A relative 26 bit branch; the lower two bits must be zero. */
544 /* A relative 16 bit branch; the lower two bits must be zero. */
559 /* A relative 16 bit branch. Bit 10 should be set to indicate that
560 the branch is expected to be taken. The lower two bits must be
561 zero. */
576 /* A relative 16 bit branch. Bit 10 should be set to indicate that
577 the branch is not expected to be taken. The lower two bits must
578 be zero. */
593 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the
594 symbol. */
609 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
610 the symbol. */
625 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
626 the symbol. */
641 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
642 the symbol. */
657 /* Like R_PPC_REL24, but referring to the procedure linkage table
658 entry for the symbol. */
673 /* This is used only by the dynamic linker. The symbol should exist
674 both in the object being run and in some shared library. The
675 dynamic linker copies the data addressed by the symbol from the
676 shared library into the object, because the object being
677 run has to have the data at some particular address. */
692 /* Like R_PPC_ADDR32, but used when setting global offset table
693 entries. */
708 /* Marks a procedure linkage table entry for a symbol. */
723 /* Used only by the dynamic linker. When the object is run, this
724 longword is set to the load address of the object, plus the
725 addend. */
740 /* Like R_PPC_REL24, but uses the value of the symbol within the
741 object rather than the final value. Normally used for
742 _GLOBAL_OFFSET_TABLE_. */
757 /* Like R_PPC_ADDR32, but may be unaligned. */
772 /* Like R_PPC_ADDR16, but may be unaligned. */
787 /* 32-bit PC relative */
802 /* 32-bit relocation to the symbol's procedure linkage table.
803 FIXME: not supported. */
818 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
819 FIXME: not supported. */
834 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
835 the symbol. */
850 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
851 the symbol. */
866 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
867 the symbol. */
882 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
883 small data items. */
898 /* 16-bit section relative relocation. */
913 /* 16-bit lower half section relative relocation. */
928 /* 16-bit upper half section relative relocation. */
943 /* 16-bit upper half adjusted section relative relocation. */
958 /* Marker reloc for TLS. */
973 /* Computes the load module index of the load module that contains the
974 definition of its TLS sym. */
989 /* Computes a dtv-relative displacement, the difference between the value
990 of sym+add and the base address of the thread-local storage block that
991 contains the definition of sym, minus 0x8000. */
1006 /* A 16 bit dtprel reloc. */
1021 /* Like DTPREL16, but no overflow. */
1036 /* Like DTPREL16_LO, but next higher group of 16 bits. */
1051 /* Like DTPREL16_HI, but adjust for low 16 bits. */
1066 /* Computes a tp-relative displacement, the difference between the value of
1067 sym+add and the value of the thread pointer (r13). */
1082 /* A 16 bit tprel reloc. */
1097 /* Like TPREL16, but no overflow. */
1112 /* Like TPREL16_LO, but next higher group of 16 bits. */
1127 /* Like TPREL16_HI, but adjust for low 16 bits. */
1142 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
1143 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset
1144 to the first entry. */
1159 /* Like GOT_TLSGD16, but no overflow. */
1174 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */
1189 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */
1204 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
1205 with values (sym+add)@dtpmod and zero, and computes the offset to the
1206 first entry. */
1221 /* Like GOT_TLSLD16, but no overflow. */
1236 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */
1251 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */
1266 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes
1267 the offset to the entry. */
1282 /* Like GOT_DTPREL16, but no overflow. */
1297 /* Like GOT_DTPREL16_LO, but next higher group of 16 bits. */
1312 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */
1327 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the
1328 offset to the entry. */
1343 /* Like GOT_TPREL16, but no overflow. */
1358 /* Like GOT_TPREL16_LO, but next higher group of 16 bits. */
1373 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */
1388 /* The remaining relocs are from the Embedded ELF ABI, and are not
1389 in the SVR4 ELF ABI. */
1391 /* 32 bit value resulting from the addend minus the symbol. */
1406 /* 16 bit value resulting from the addend minus the symbol. */
1421 /* 16 bit value resulting from the addend minus the symbol. */
1436 /* The high order 16 bits of the addend minus the symbol. */
1451 /* The high order 16 bits of the result of the addend minus the address,
1452 plus 1 if the contents of the low 16 bits, treated as a signed number,
1453 is negative. */
1468 /* 16 bit value resulting from allocating a 4 byte word to hold an
1469 address in the .sdata section, and returning the offset from
1470 _SDA_BASE_ for that relocation. */
1485 /* 16 bit value resulting from allocating a 4 byte word to hold an
1486 address in the .sdata2 section, and returning the offset from
1487 _SDA2_BASE_ for that relocation. */
1502 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
1503 small data items. */
1518 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
1519 signed offset from the appropriate base, and filling in the register
1520 field with the appropriate register (0, 2, or 13). */
1535 /* Relocation not handled: R_PPC_EMB_MRKREF */
1536 /* Relocation not handled: R_PPC_EMB_RELSEC16 */
1537 /* Relocation not handled: R_PPC_EMB_RELST_LO */
1538 /* Relocation not handled: R_PPC_EMB_RELST_HI */
1539 /* Relocation not handled: R_PPC_EMB_RELST_HA */
1540 /* Relocation not handled: R_PPC_EMB_BIT_FLD */
1542 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
1543 in the 16 bit signed offset from the appropriate base, and filling in the
1544 register field with the appropriate register (0, 2, or 13). */
1559 /* GNU extension to record C++ vtable hierarchy. */
1574 /* GNU extension to record C++ vtable member usage. */
1589 /* Phony reloc to handle AIX style TOC entries. */
1603 };
1604 \f
1605 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
1607 static void
1609 {
1613 {
1617 }
1618 }
1619 \f
1620 /* This function handles relaxing for the PPC with option --mpc860c0[=<n>].
1622 The MPC860, revision C0 or earlier contains a bug in the die.
1623 If all of the following conditions are true, the next instruction
1624 to be executed *may* be treated as a no-op.
1625 1/ A forward branch is executed.
1626 2/ The branch is predicted as not taken.
1627 3/ The branch is taken.
1628 4/ The branch is located in the last 5 words of a page.
1629 (The EOP limit is 5 by default but may be specified as any value from 1-10.)
1631 Our software solution is to detect these problematic branches in a
1632 linker pass and modify them as follows:
1633 1/ Unconditional branches - Since these are always predicted taken,
1634 there is no problem and no action is required.
1635 2/ Conditional backward branches - No problem, no action required.
1636 3/ Conditional forward branches - Ensure that the "inverse prediction
1637 bit" is set (ensure it is predicted taken).
1638 4/ Conditional register branches - Ensure that the "y bit" is set
1639 (ensure it is predicted taken). */
1641 /* Sort sections by address. */
1643 static int
1647 {
1651 /* Sort by offset. */
1653 }
1655 static bfd_boolean
1661 {
1662 #define PAGESIZE 0x1000
1671 /* We never have to do this more than once per input section. */
1674 /* If needed, initialize this section's cooked size. */
1678 /* We're only interested in text sections which overlap the
1679 troublesome area at the end of a page. */
1681 {
1683 bfd_boolean section_modified;
1685 /* Get the section contents. */
1686 /* Get cached copy if it exists. */
1689 else
1690 {
1691 /* Go get them off disk. */
1700 }
1705 {
1707 bfd_size_type amt;
1709 /* Get a copy of the native relocations. */
1710 internal_relocs
1719 /* Setup a faster access method for the reloc info we need. */
1726 {
1733 /* Prologue constants are sometimes present in the ".text"
1734 sections and they can be identified by their associated
1735 relocation. We don't want to process those words and
1736 some others which can also be identified by their
1737 relocations. However, not all conditional branches will
1738 have a relocation so we will only ignore words that
1739 1) have a reloc, and 2) the reloc is not applicable to a
1740 conditional branch. The array rela_comb is built here
1741 for use in the EOP scan loop. */
1743 {
1747 /* We should check the instruction. */
1750 /* The word is not a conditional branch - ignore it. */
1753 }
1754 }
1757 ppc_elf_sort_rela);
1758 }
1760 /* Enumerate each EOP region that overlaps this section. */
1765 /* Increment the start position if this section begins in the
1766 middle of its first EOP region. */
1772 {
1773 /* Check each word in this EOP region. */
1775 {
1776 bfd_vma isec_offset;
1780 /* Don't process this word if there is a relocation for it
1781 and the relocation indicates the word is not a
1782 conditional branch. */
1786 {
1787 bfd_vma r_offset;
1791 {
1794 }
1795 }
1798 /* Check the current word for a problematic conditional
1799 branch. */
1800 #define BO0(insn) ((insn) & 0x02000000)
1801 #define BO2(insn) ((insn) & 0x00800000)
1802 #define BO4(insn) ((insn) & 0x00200000)
1806 {
1807 /* Instruction is BCx */
1809 {
1810 bfd_vma target;
1812 /* This branch is predicted as "normal".
1813 If this is a forward branch, it is problematic. */
1817 /* Convert to abs. */
1820 {
1821 /* Set the prediction bit. */
1824 }
1825 }
1826 }
1828 {
1829 /* Instruction is BCCTRx. */
1831 {
1832 /* This branch is predicted as not-taken.
1833 If this is a forward branch, it is problematic.
1834 Since we can't tell statically if it will branch
1835 forward, always set the prediction bit. */
1838 }
1839 }
1841 {
1842 /* Instruction is BCLRx */
1844 {
1845 /* This branch is predicted as not-taken.
1846 If this is a forward branch, it is problematic.
1847 Since we can't tell statically if it will branch
1848 forward, always set the prediction bit. */
1851 }
1852 }
1853 #undef BO0
1854 #undef BO2
1855 #undef BO4
1857 {
1860 }
1861 }
1862 }
1864 {
1867 }
1868 }
1871 {
1874 }
1877 {
1880 }
1883 {
1886 else
1887 {
1888 /* Cache the section contents for elf_link_input_bfd. */
1890 }
1892 }
1896 error_return:
1904 }
1905 \f
1909 bfd_reloc_code_real_type code;
1910 {
1914 /* Initialize howto table if needed. */
1918 {
2003 }
2006 };
2008 /* Set the howto pointer for a PowerPC ELF reloc. */
2010 static void
2015 {
2017 /* Initialize howto table if needed. */
2022 }
2024 /* Handle the R_PPC_ADDR16_HA reloc. */
2026 static bfd_reloc_status_type
2032 PTR data ATTRIBUTE_UNUSED;
2036 {
2037 bfd_vma relocation;
2040 {
2043 }
2050 else
2060 }
2062 static bfd_reloc_status_type
2068 PTR data;
2072 {
2073 /* If this is a relocatable link (output_bfd test tells us), just
2074 call the generic function. Any adjustment will be done at final
2075 link time. */
2081 {
2086 }
2088 }
2090 /* Fix bad default arch selected for a 32 bit input bfd when the
2091 default is 64 bit. */
2093 static bfd_boolean
2096 {
2098 {
2102 {
2103 /* Relies on arch after 64 bit default being 32 bit default. */
2106 }
2107 }
2109 }
2111 /* Function to set whether a module needs the -mrelocatable bit set. */
2113 static bfd_boolean
2116 flagword flags;
2117 {
2124 }
2126 /* Merge backend specific data from an object file to the output
2127 object file when linking. */
2129 static bfd_boolean
2133 {
2134 flagword old_flags;
2135 flagword new_flags;
2136 bfd_boolean error;
2138 /* Check if we have the same endianess. */
2149 {
2150 /* First call, no flags set. */
2153 }
2155 /* Compatible flags are ok. */
2157 ;
2159 /* Incompatible flags. */
2160 else
2161 {
2162 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
2163 to be linked with either. */
2167 {
2172 }
2175 {
2180 }
2182 /* The output is -mrelocatable-lib iff both the input files are. */
2186 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
2187 but each input file is either -mrelocatable or -mrelocatable-lib. */
2193 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
2194 any module uses it. */
2200 /* Warn about any other mismatches. */
2202 {
2207 }
2210 {
2213 }
2214 }
2217 }
2218 \f
2219 /* Handle a PowerPC specific section when reading an object file. This
2220 is called when elfcode.h finds a section with an unknown type. */
2222 static bfd_boolean
2227 {
2229 flagword flags;
2244 }
2245 \f
2246 /* Set up any other section flags and such that may be necessary. */
2248 static bfd_boolean
2253 {
2261 }
2262 \f
2263 /* Create a special linker section */
2269 {
2273 /* Record the first bfd section that needs the special section. */
2277 /* If this is the first time, create the section. */
2280 {
2281 elf_linker_section_t defaults;
2289 /* Both of these sections are (technically) created by the user
2290 putting data in them, so they shouldn't be marked
2291 SEC_LINKER_CREATED.
2293 The linker creates them so it has somewhere to attach their
2294 respective symbols. In fact, if they were empty it would
2295 be OK to leave the symbol set to 0 (or any random number), because
2296 the appropriate register should never be used. */
2301 {
2326 }
2329 }
2332 }
2333 \f
2334 /* If we have a non-zero sized .sbss2 or .PPC.EMB.sbss0 sections, we
2335 need to bump up the number of section headers. */
2337 static int
2340 {
2359 }
2361 /* Modify the segment map if needed. */
2363 static bfd_boolean
2366 {
2368 }
2369 \f
2370 /* The powerpc .got has a blrl instruction in it. Mark it executable. */
2372 static bfd_boolean
2376 {
2379 flagword flags;
2404 }
2406 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2407 to output sections (just like _bfd_elf_create_dynamic_sections has
2408 to create .dynbss and .rela.bss). */
2410 static bfd_boolean
2414 {
2417 flagword flags;
2436 {
2443 }
2452 }
2454 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
2455 copying dynamic variables from a shared lib into an app's dynbss
2456 section, and instead use a dynamic relocation to point into the
2457 shared lib. */
2458 #define ELIMINATE_COPY_RELOCS 1
2460 /* Adjust a symbol defined by a dynamic object and referenced by a
2461 regular object. The current definition is in some section of the
2462 dynamic object, but we're not including those sections. We have to
2463 change the definition to something the rest of the link can
2464 understand. */
2466 static bfd_boolean
2470 {
2475 #ifdef DEBUG
2478 #endif
2480 /* Make sure we know what is going on here. */
2492 /* Deal with function syms. */
2495 {
2496 /* Clear procedure linkage table information for any symbol that
2497 won't need a .plt entry. */
2501 {
2502 /* A PLT entry is not required/allowed when:
2504 1. We are not using ld.so; because then the PLT entry
2505 can't be set up, so we can't use one.
2507 2. We know for certain that a call to this symbol
2508 will go to this object.
2510 3. GC has rendered the entry unused. */
2513 }
2515 }
2516 else
2519 /* If this is a weak symbol, and there is a real definition, the
2520 processor independent code will have arranged for us to see the
2521 real definition first, and we can just use the same value. */
2523 {
2529 }
2531 /* This is a reference to a symbol defined by a dynamic object which
2532 is not a function. */
2534 /* If we are creating a shared library, we must presume that the
2535 only references to the symbol are via the global offset table.
2536 For such cases we need not do anything here; the relocations will
2537 be handled correctly by relocate_section. */
2541 /* If there are no references to this symbol that do not use the
2542 GOT, we don't need to generate a copy reloc. */
2547 {
2550 {
2554 }
2556 /* If we didn't find any dynamic relocs in read-only sections, then
2557 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2559 {
2562 }
2563 }
2565 /* We must allocate the symbol in our .dynbss section, which will
2566 become part of the .bss section of the executable. There will be
2567 an entry for this symbol in the .dynsym section. The dynamic
2568 object will contain position independent code, so all references
2569 from the dynamic object to this symbol will go through the global
2570 offset table. The dynamic linker will use the .dynsym entry to
2571 determine the address it must put in the global offset table, so
2572 both the dynamic object and the regular object will refer to the
2573 same memory location for the variable.
2575 Of course, if the symbol is sufficiently small, we must instead
2576 allocate it in .sbss. FIXME: It would be better to do this if and
2577 only if there were actually SDAREL relocs for that symbol. */
2581 else
2585 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
2586 copy the initial value out of the dynamic object and into the
2587 runtime process image. We need to remember the offset into the
2588 .rela.bss section we are going to use. */
2590 {
2595 else
2600 }
2602 /* We need to figure out the alignment required for this symbol. I
2603 have no idea how ELF linkers handle this. */
2608 /* Apply the required alignment. */
2612 {
2615 }
2617 /* Define the symbol as being at this point in the section. */
2621 /* Increment the section size to make room for the symbol. */
2625 }
2626 \f
2627 /* This is the condition under which finish_dynamic_symbol will be
2628 called from elflink.h. If elflink.h doesn't call our
2629 finish_dynamic_symbol routine, we'll need to do something about
2630 initializing any .plt and .got entries in relocate_section. */
2631 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2632 ((DYN) \
2633 && ((SHARED) \
2634 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
2635 && ((H)->dynindx != -1 \
2636 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
2638 /* Of those relocs that might be copied as dynamic relocs, this macro
2639 selects those that must be copied when linking a shared library,
2640 even when the symbol is local. */
2642 #define MUST_BE_DYN_RELOC(RTYPE) \
2643 ((RTYPE) != R_PPC_REL24 \
2644 && (RTYPE) != R_PPC_REL14 \
2645 && (RTYPE) != R_PPC_REL14_BRTAKEN \
2646 && (RTYPE) != R_PPC_REL14_BRNTAKEN \
2647 && (RTYPE) != R_PPC_REL32)
2649 /* Allocate space in associated reloc sections for dynamic relocs. */
2651 static bfd_boolean
2654 PTR inf;
2655 {
2665 /* When warning symbols are created, they **replace** the "real"
2666 entry in the hash table, thus we never get to see the real
2667 symbol in a hash traversal. So look at it now. */
2673 {
2674 /* Make sure this symbol is output as a dynamic symbol. */
2677 {
2680 }
2684 {
2687 /* If this is the first .plt entry, make room for the special
2688 first entry. */
2692 /* The PowerPC PLT is actually composed of two parts, the
2693 first part is 2 words (for a load and a jump), and then
2694 there is a remaining word available at the end. */
2696 + (PLT_SLOT_SIZE
2700 /* If this symbol is not defined in a regular file, and we
2701 are not generating a shared library, then set the symbol
2702 to this location in the .plt. This is required to make
2703 function pointers compare as equal between the normal
2704 executable and the shared library. */
2707 {
2710 }
2712 /* Make room for this entry. After the 8192nd entry, room
2713 for two entries is allocated. */
2719 /* We also need to make an entry in the .rela.plt section. */
2721 }
2722 else
2723 {
2726 }
2727 }
2728 else
2729 {
2732 }
2736 {
2737 /* Make sure this symbol is output as a dynamic symbol. */
2740 {
2743 }
2747 /* If just an LD reloc, we'll just use htab->tlsld_got.offset. */
2749 else
2750 {
2751 bfd_boolean dyn;
2754 {
2763 }
2764 else
2769 {
2770 /* All the entries we allocated need relocs. */
2774 /* Except LD only needs one. */
2777 }
2778 }
2779 }
2780 else
2786 /* In the shared -Bsymbolic case, discard space allocated for
2787 dynamic pc-relative relocs against symbols which turn out to be
2788 defined in regular objects. For the normal shared case, discard
2789 space for relocs that have become local due to symbol visibility
2790 changes. */
2792 {
2796 {
2800 {
2805 else
2807 }
2808 }
2809 }
2811 {
2812 /* For the non-shared case, discard space for relocs against
2813 symbols which turn out to need copy relocs or are not
2814 dynamic. */
2819 {
2820 /* Make sure this symbol is output as a dynamic symbol.
2821 Undefined weak syms won't yet be marked as dynamic. */
2824 {
2827 }
2829 /* If that succeeded, we know we'll be keeping all the
2830 relocs. */
2833 }
2837 keep: ;
2838 }
2840 /* Finally, allocate space. */
2842 {
2845 }
2848 }
2850 /* Find any dynamic relocs that apply to read-only sections. */
2852 static bfd_boolean
2855 PTR info;
2856 {
2866 {
2872 {
2875 /* Not an error, just cut short the traversal. */
2877 }
2878 }
2880 }
2882 /* Set the sizes of the dynamic sections. */
2884 static bfd_boolean
2888 {
2891 bfd_boolean relocs;
2894 #ifdef DEBUG
2896 #endif
2902 {
2903 /* Set the contents of the .interp section to the interpreter. */
2905 {
2910 }
2911 }
2914 {
2919 }
2920 else
2923 /* Set up .got offsets for local syms, and space for local dynamic
2924 relocs. */
2926 {
2930 bfd_size_type locsymcount;
2938 {
2945 {
2948 {
2949 /* Input section has been discarded, either because
2950 it is a copy of a linkonce section or due to
2951 linker script /DISCARD/, so we'll be discarding
2952 the relocs too. */
2953 }
2955 {
2962 }
2963 }
2964 }
2978 {
2980 {
2981 /* If just an LD reloc, we'll just use
2982 htab->tlsld_got.offset. */
2984 {
2989 }
2991 }
2992 else
2993 {
2996 {
3003 }
3004 else
3009 }
3010 }
3011 else
3013 }
3015 /* Allocate space for global sym dynamic relocs. */
3018 /* We've now determined the sizes of the various dynamic sections.
3019 Allocate memory for them. */
3022 {
3030 {
3031 /* Strip this section if we don't need it; see the
3032 comment below. */
3033 }
3035 {
3037 {
3038 /* If we don't need this section, strip it from the
3039 output file. This is mostly to handle .rela.bss and
3040 .rela.plt. We must create both sections in
3041 create_dynamic_sections, because they must be created
3042 before the linker maps input sections to output
3043 sections. The linker does that before
3044 adjust_dynamic_symbol is called, and it is that
3045 function which decides whether anything needs to go
3046 into these sections. */
3047 }
3048 else
3049 {
3050 /* Remember whether there are any relocation sections. */
3053 /* We use the reloc_count field as a counter if we need
3054 to copy relocs into the output file. */
3056 }
3057 }
3058 else
3059 {
3060 /* It's not one of our sections, so don't allocate space. */
3062 }
3065 {
3068 }
3070 /* Allocate memory for the section contents. */
3074 }
3077 {
3078 /* Add some entries to the .dynamic section. We fill in the
3079 values later, in ppc_elf_finish_dynamic_sections, but we
3080 must add the entries now so that we get the correct size for
3081 the .dynamic section. The DT_DEBUG entry is filled in by the
3082 dynamic linker and used by the debugger. */
3083 #define add_dynamic_entry(TAG, VAL) \
3084 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
3087 {
3090 }
3093 {
3099 }
3102 {
3107 }
3109 /* If any dynamic relocs apply to a read-only section, then we
3110 need a DT_TEXTREL entry. */
3116 {
3119 }
3120 }
3121 #undef add_dynamic_entry
3124 }
3125 \f
3126 static bfd_boolean
3132 {
3137 {
3145 }
3151 }
3153 static void
3157 {
3163 }
3165 /* Look through the relocs for a section during the first phase, and
3166 allocate space in the global offset table or procedure linkage
3167 table. */
3169 static bfd_boolean
3175 {
3186 #ifdef DEBUG
3190 #endif
3192 /* Create the linker generated sections all the time so that the
3193 special symbols are created. */
3197 {
3201 LINKER_SECTION_SDATA);
3204 }
3207 {
3211 LINKER_SECTION_SDATA2);
3214 }
3222 {
3231 else
3234 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
3235 This shows up in particular in an R_PPC_ADDR32 in the eabi
3236 startup code. */
3238 {
3240 {
3245 }
3246 }
3250 {
3280 dogottls:
3282 /* Fall thru */
3284 /* GOT16 relocations */
3289 /* This symbol requires a global offset table entry. */
3291 {
3296 }
3298 {
3301 }
3302 else
3303 /* This is a global offset table entry for a local symbol. */
3308 /* Indirect .sdata relocation. */
3311 {
3314 }
3320 /* Indirect .sdata2 relocation. */
3323 {
3326 }
3342 {
3345 }
3354 #ifdef DEBUG
3356 #endif
3357 /* This symbol requires a procedure linkage table entry. We
3358 actually build the entry in finish_dynamic_symbol,
3359 because this might be a case of linking PIC code without
3360 linking in any dynamic objects, in which case we don't
3361 need to generate a procedure linkage table after all. */
3364 {
3365 /* It does not make sense to have a procedure linkage
3366 table entry for a local symbol. */
3369 }
3375 /* The following relocations don't need to propagate the
3376 relocation if linking a shared object since they are
3377 section relative. */
3389 /* This are just markers. */
3396 /* These should only appear in dynamic objects. */
3403 /* These aren't handled yet. We'll report an error later. */
3412 /* This refers only to functions defined in the shared library. */
3416 /* This relocation describes the C++ object vtable hierarchy.
3417 Reconstruct it for later use during GC. */
3423 /* This relocation describes which C++ vtable entries are actually
3424 used. Record for later use during GC. */
3430 /* We shouldn't really be seeing these. */
3436 /* Nor these. */
3449 /* When creating a shared object, we must copy these
3450 relocs into the output file. We create a reloc
3451 section in dynobj and make room for the reloc. */
3461 /* fall through */
3475 {
3476 /* We may need a plt entry if the symbol turns out to be
3477 a function defined in a dynamic object. */
3480 /* We may need a copy reloc too. */
3482 }
3484 dodyn:
3485 /* If we are creating a shared library, and this is a reloc
3486 against a global symbol, or a non PC relative reloc
3487 against a local symbol, then we need to copy the reloc
3488 into the shared library. However, if we are linking with
3489 -Bsymbolic, we do not need to copy a reloc against a
3490 global symbol which is defined in an object we are
3491 including in the link (i.e., DEF_REGULAR is set). At
3492 this point we have not seen all the input files, so it is
3493 possible that DEF_REGULAR is not set now but will be set
3494 later (it is never cleared). In case of a weak definition,
3495 DEF_REGULAR may be cleared later by a strong definition in
3496 a shared library. We account for that possibility below by
3497 storing information in the dyn_relocs field of the hash
3498 table entry. A similar situation occurs when creating
3499 shared libraries and symbol visibility changes render the
3500 symbol local.
3502 If on the other hand, we are creating an executable, we
3503 may need to keep relocations for symbols satisfied by a
3504 dynamic library if we manage to avoid copy relocs for the
3505 symbol. */
3513 || (ELIMINATE_COPY_RELOCS
3520 {
3524 #ifdef DEBUG
3528 #endif
3530 {
3533 name = (bfd_elf_string_from_elf_section
3546 {
3547 flagword flags;
3560 }
3562 }
3564 /* If this is a global symbol, we count the number of
3565 relocations we need for this symbol. */
3567 {
3569 }
3570 else
3571 {
3572 /* Track dynamic relocs needed for local syms too.
3573 We really need local syms available to do this
3574 easily. Oh well. */
3584 }
3588 {
3598 }
3603 }
3606 }
3607 }
3610 }
3612 /* Return the section that should be marked against GC for a given
3613 relocation. */
3622 {
3624 {
3626 {
3633 {
3643 }
3644 }
3645 }
3646 else
3650 }
3652 /* Update the got, plt and dynamic reloc reference counts for the
3653 section being removed. */
3655 static bfd_boolean
3661 {
3677 {
3684 {
3693 {
3694 /* Everything must go for SEC. */
3697 }
3698 }
3702 {
3708 /* Fall thru */
3727 {
3730 }
3732 {
3735 }
3747 /* Fall thru */
3766 {
3769 }
3774 }
3775 }
3777 }
3779 /* Set htab->tls_sec and htab->tls_get_addr. */
3781 bfd_boolean
3785 {
3800 }
3802 /* Run through all the TLS relocs looking for optimization
3803 opportunities. */
3805 bfd_boolean
3809 {
3819 {
3825 {
3829 /* Read the relocations. */
3839 {
3845 bfd_boolean is_local;
3849 {
3857 }
3866 {
3871 /* These relocs should never be against a symbol
3872 defined in a shared lib. Leave them alone if
3873 that turns out to be the case. */
3879 /* LD -> LE */
3890 /* GD -> LE */
3892 else
3893 /* GD -> IE */
3905 {
3906 /* IE -> LE */
3910 }
3911 else
3921 {
3924 }
3931 }
3934 {
3936 {
3937 /* We managed to get rid of a got entry. */
3940 }
3942 }
3943 else
3944 {
3950 {
3957 {
3961 }
3962 }
3968 {
3969 /* We managed to get rid of a got entry. */
3972 }
3975 }
3979 }
3983 }
3987 {
3990 else
3992 }
3993 }
3995 }
3996 \f
3997 /* Hook called by the linker routine which adds symbols from an object
3998 file. We use it to put .comm items in .sbss, and not .bss. */
4000 static bfd_boolean
4009 {
4014 {
4015 /* Common symbols less than or equal to -G nn bytes are automatically
4016 put into .sdata. */
4017 elf_linker_section_t *sdata
4021 {
4022 bfd_size_type amt;
4024 /* We don't go through bfd_make_section, because we don't
4025 want to attach this common section to DYNOBJ. The linker
4026 will move the symbols to the appropriate output section
4027 when it defines common symbols. */
4047 }
4051 }
4054 }
4055 \f
4056 /* Finish up dynamic symbol handling. We set the contents of various
4057 dynamic sections here. */
4059 static bfd_boolean
4065 {
4068 #ifdef DEBUG
4071 #endif
4077 {
4078 Elf_Internal_Rela rela;
4080 bfd_vma reloc_index;
4082 #ifdef DEBUG
4084 #endif
4086 /* This symbol has an entry in the procedure linkage table. Set
4087 it up. */
4092 /* We don't need to fill in the .plt. The ppc dynamic linker
4093 will fill it in. */
4095 /* Fill in the entry in the .rela.plt section. */
4110 {
4111 /* Mark the symbol as undefined, rather than as defined in
4112 the .plt section. Leave the value alone. */
4114 /* If the symbol is weak, we do need to clear the value.
4115 Otherwise, the PLT entry would provide a definition for
4116 the symbol even if the symbol wasn't defined anywhere,
4117 and so the symbol would never be NULL. */
4121 }
4122 }
4125 {
4127 Elf_Internal_Rela rela;
4130 /* This symbols needs a copy reloc. Set it up. */
4132 #ifdef DEBUG
4134 #endif
4140 else
4151 }
4153 #ifdef DEBUG
4155 #endif
4157 /* Mark some specially defined symbols as absolute. */
4164 }
4165 \f
4166 /* Finish up the dynamic sections. */
4168 static bfd_boolean
4172 {
4176 #ifdef DEBUG
4178 #endif
4184 {
4192 {
4193 Elf_Internal_Dyn dyn;
4199 {
4216 }
4219 }
4220 }
4222 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
4223 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
4225 {
4231 else
4237 }
4240 }
4241 \f
4242 /* The RELOCATE_SECTION function is called by the ELF backend linker
4243 to handle the relocations for a section.
4245 The relocs are always passed as Rela structures; if the section
4246 actually uses Rel structures, the r_addend field will always be
4247 zero.
4249 This function is responsible for adjust the section contents as
4250 necessary, and (if using Rela relocs and generating a
4251 relocateable output file) adjusting the reloc addend as
4252 necessary.
4254 This function does not have to worry about setting the reloc
4255 address or the reloc symbol index.
4257 LOCAL_SYMS is a pointer to the swapped in local symbols.
4259 LOCAL_SECTIONS is an array giving the section in the input file
4260 corresponding to the st_shndx field of each local symbol.
4262 The global hash table entry for the global symbols can be found
4263 via elf_sym_hashes (input_bfd).
4265 When generating relocateable output, this function must handle
4266 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
4267 going to be the section symbol corresponding to the output
4268 section, which means that the addend must be adjusted
4269 accordingly. */
4271 static bfd_boolean
4282 {
4288 Elf_Internal_Rela outrel;
4294 #ifdef DEBUG
4300 #endif
4306 /* Initialize howto table if needed. */
4316 {
4318 bfd_vma addend;
4319 bfd_reloc_status_type r;
4326 bfd_vma relocation;
4328 bfd_boolean unresolved_reloc;
4329 bfd_boolean warned;
4340 {
4346 }
4347 else
4348 {
4358 {
4360 /* Set a flag that will be cleared later if we find a
4361 relocation value for this symbol. output_section
4362 is typically NULL for symbols satisfied by a shared
4363 library. */
4366 else
4370 }
4372 ;
4376 ;
4377 else
4378 {
4386 }
4387 }
4389 /* TLS optimizations. Replace instruction sequences and relocs
4390 based on information we collected in tls_optimize. We edit
4391 RELOCS so that --emit-relocs will output something sensible
4392 for the final instruction stream. */
4396 {
4400 {
4404 }
4405 }
4407 /* Ensure reloc mapping code below stays sane. */
4418 {
4426 {
4427 bfd_vma insn;
4434 }
4440 {
4449 else
4452 /* add -> addi. */
4458 /* load and store indexed -> dform. */
4462 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
4467 /* lwax -> lwa. */
4469 else
4475 /* Was PPC_TLS which sits on insn boundary, now
4476 PPC_TPREL16_LO which is at insn+2. */
4478 }
4491 {
4492 tls_gdld_hi:
4496 else
4497 {
4501 }
4503 }
4516 {
4517 tls_get_addr_check:
4519 {
4524 bfd_vma offset;
4526 /* The next instruction should be a call to
4527 __tls_get_addr. Peek at the reloc to be sure. */
4528 r_type2
4546 /* OK, it checks out. Replace the call. */
4553 {
4554 /* IE */
4562 }
4563 else
4564 {
4565 /* LE */
4569 {
4570 /* Was an LD reloc. */
4574 }
4578 R_PPC_TPREL16_LO);
4580 }
4583 {
4587 }
4592 {
4593 /* We changed the symbol on an LD reloc. Start over
4594 in order to get h, sym, sec etc. right. */
4595 rel--;
4597 }
4598 }
4599 }
4601 }
4603 /* Handle other relocations that tweak non-addend part of insn. */
4606 {
4610 /* Branch taken prediction relocations. */
4614 /* Fall thru */
4616 /* Branch not taken predicition relocations. */
4627 /* Invert 'y' bit if not the default. */
4633 }
4641 {
4658 /* GOT16 relocations. Like an ADDR16 using the symbol's
4659 address in the GOT as relocation value instead of the
4660 symbol's value itself. Also, create a GOT entry for the
4661 symbol and put the symbol value there. */
4694 dogot:
4695 {
4696 /* Relocation is to the entry for this symbol in the global
4697 offset table. */
4698 bfd_vma off;
4711 {
4712 bfd_boolean dyn;
4717 /* This is actually a static link, or it is a
4718 -Bsymbolic link and the symbol is defined
4719 locally, or the symbol was forced to be local
4720 because of a version file. */
4721 ;
4722 else
4723 {
4726 }
4728 }
4729 else
4730 {
4734 }
4736 /* The offset must always be a multiple of 4. We use the
4737 least significant bit to record whether we have already
4738 processed this entry. */
4742 else
4743 {
4755 /* We might have multiple got entries for this sym.
4756 Initialize them all. */
4757 do
4758 {
4762 {
4765 }
4767 {
4770 }
4772 {
4775 }
4777 {
4780 }
4782 /* Generate relocs for the dynamic linker. */
4784 {
4789 {
4793 {
4799 outrel.r_info
4802 }
4803 }
4810 else
4819 }
4821 /* Init the .got section contents if we're not
4822 emitting a reloc. */
4823 else
4824 {
4829 {
4833 }
4836 {
4840 }
4845 }
4850 }
4855 }
4861 {
4863 {
4870 {
4874 {
4877 }
4878 }
4879 }
4880 }
4884 /* Addends on got relocations don't make much sense.
4885 x+off@got is actually x@got+off, and since the got is
4886 generated by a hash table traversal, the value in the
4887 got at entry m+n bears little relation to the entry m. */
4894 sym_name);
4895 }
4898 /* Relocations that need no special processing. */
4900 /* It makes no sense to point a local relocation
4901 at a symbol not in this object. */
4906 {
4909 input_bfd,
4910 input_section,
4912 TRUE))
4915 }
4925 /* Relocations that may need to be propagated if this is a shared
4926 object. */
4932 /* The TPREL16 relocs shouldn't really be used in shared
4933 libs as they will result in DT_TEXTREL being set, but
4934 support them anyway. */
4950 /* If these relocations are not to a named symbol, they can be
4951 handled right here, no need to bother the dynamic linker. */
4956 /* fall through */
4958 /* Relocations that always need to be propagated if this is a shared
4959 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 }
5040 /* h->dynindx may be -1 if this symbol was marked to
5041 become local. */
5044 {
5048 }
5049 else
5050 {
5055 else
5056 {
5062 {
5065 }
5066 else
5067 {
5070 /* We are turning this relocation into one
5071 against a section symbol. It would be
5072 proper to subtract the symbol's value,
5073 osec->vma, from the emitted reloc addend,
5074 but ld.so expects buggy relocs. */
5078 #ifdef DEBUG
5080 {
5084 }
5085 #endif
5086 }
5089 }
5090 }
5099 /* This reloc will be computed at runtime. We clear the memory
5100 so that it contains predictable value. */
5104 {
5108 }
5109 }
5112 /* Indirect .sdata relocation. */
5115 relocation
5119 R_PPC_RELATIVE);
5122 /* Indirect .sdata2 relocation. */
5125 relocation
5129 R_PPC_RELATIVE);
5132 /* Handle the TOC16 reloc. We want to use the offset within the .got
5133 section, not the actual VMA. This is appropriate when generating
5134 an embedded ELF object, for which the .got section acts like the
5135 AIX .toc section. */
5146 /* Relocation is to the entry for this symbol in the
5147 procedure linkage table. */
5152 {
5153 /* We didn't make a PLT entry for this symbol. This
5154 happens when statically linking PIC code, or when
5155 using -Bsymbolic. */
5157 }
5165 /* Relocate against _SDA_BASE_. */
5167 {
5177 {
5178 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
5180 sym_name,
5182 name);
5183 }
5188 }
5191 /* Relocate against _SDA2_BASE_. */
5193 {
5201 {
5202 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
5204 sym_name,
5206 name);
5211 }
5216 }
5219 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
5222 {
5233 {
5239 }
5243 {
5249 }
5253 {
5255 }
5257 else
5258 {
5259 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"),
5261 sym_name,
5263 name);
5268 }
5275 }
5276 }
5279 /* Relocate against the beginning of the section. */
5288 /* Negative relocations. */
5316 sym_name);
5321 }
5323 /* Do any further special processing. */
5325 {
5341 /* It's just possible that this symbol is a weak symbol
5342 that's not actually defined anywhere. In that case,
5343 'sec' would be NULL, and we should leave the symbol
5344 alone (it will be set to zero elsewhere in the link). */
5346 /* Add 0x10000 if sign bit in 0:15 is set. */
5349 }
5351 #ifdef DEBUG
5352 fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n",
5355 sym_name,
5356 r_symndx,
5359 #endif
5364 {
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