| blob | bc19406c4467f0a40ac86a4b0435f1b17e9f9dc7 |
1 /* PowerPC-specific support for 32-bit ELF
2 Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
3 2004, 2005 Free Software Foundation, Inc.
4 Written by Ian Lance Taylor, Cygnus Support.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the
20 Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
21 Boston, MA 02110-1301, USA. */
23 /* This file is based on a preliminary PowerPC ELF ABI. The
24 information may not match the final PowerPC ELF ABI. It includes
25 suggestions from the in-progress Embedded PowerPC ABI, and that
26 information may also not match. */
36 /* RELA relocations are used here. */
38 static bfd_reloc_status_type ppc_elf_addr16_ha_reloc
40 static bfd_reloc_status_type ppc_elf_unhandled_reloc
43 /* Branch prediction bit for branch taken relocs. */
44 #define BRANCH_PREDICT_BIT 0x200000
45 /* Mask to set RA in memory instructions. */
46 #define RA_REGISTER_MASK 0x001f0000
47 /* Value to shift register by to insert RA. */
48 #define RA_REGISTER_SHIFT 16
50 /* The name of the dynamic interpreter. This is put in the .interp
51 section. */
54 /* For old-style PLT. */
55 /* The size in bytes of an entry in the procedure linkage table. */
56 #define PLT_ENTRY_SIZE 12
57 /* The initial size of the plt reserved for the dynamic linker. */
58 #define PLT_INITIAL_ENTRY_SIZE 72
59 /* The size of the gap between entries in the PLT. */
60 #define PLT_SLOT_SIZE 8
61 /* The number of single-slot PLT entries (the rest use two slots). */
62 #define PLT_NUM_SINGLE_ENTRIES 8192
64 /* For new-style .glink and .plt. */
65 #define GLINK_PLTRESOLVE 12*4
66 #define GLINK_ENTRY_SIZE 4*4
68 /* Some instructions. */
69 #define NOP 0x60000000
70 #define B 0x48000000
71 #define ADDIS_11_11 0x3d6b0000
72 #define ADDI_11_11 0x396b0000
73 #define SUB_11_11_30 0x7d7e5850
74 #define ADD_0_11_11 0x7c0b5a14
75 #define ADD_11_0_11 0x7d605a14
76 #define LWZ_0_4_30 0x801e0004
77 #define MTCTR_0 0x7c0903a6
78 #define LWZ_12_8_30 0x819e0008
79 #define BCTR 0x4e800420
80 #define ADDIS_11_30 0x3d7e0000
81 #define LWZ_11_X_11 0x816b0000
82 #define LWZ_11_X_30 0x817e0000
83 #define MTCTR_11 0x7d6903a6
85 /* Offset of tp and dtp pointers from start of TLS block. */
86 #define TP_OFFSET 0x7000
87 #define DTP_OFFSET 0x8000
88 \f
92 /* This reloc does nothing. */
107 /* A standard 32 bit relocation. */
122 /* An absolute 26 bit branch; the lower two bits must be zero.
123 FIXME: we don't check that, we just clear them. */
138 /* A standard 16 bit relocation. */
153 /* A 16 bit relocation without overflow. */
168 /* The high order 16 bits of an address. */
183 /* The high order 16 bits of an address, plus 1 if the contents of
184 the low 16 bits, treated as a signed number, is negative. */
199 /* An absolute 16 bit branch; the lower two bits must be zero.
200 FIXME: we don't check that, we just clear them. */
215 /* An absolute 16 bit branch, for which bit 10 should be set to
216 indicate that the branch is expected to be taken. The lower two
217 bits must be zero. */
232 /* An absolute 16 bit branch, for which bit 10 should be set to
233 indicate that the branch is not expected to be taken. The lower
234 two bits must be zero. */
249 /* A relative 26 bit branch; the lower two bits must be zero. */
264 /* A relative 16 bit branch; the lower two bits must be zero. */
279 /* A relative 16 bit branch. Bit 10 should be set to indicate that
280 the branch is expected to be taken. The lower two bits must be
281 zero. */
296 /* A relative 16 bit branch. Bit 10 should be set to indicate that
297 the branch is not expected to be taken. The lower two bits must
298 be zero. */
313 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the
314 symbol. */
329 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
330 the symbol. */
345 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
346 the symbol. */
361 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
362 the symbol. */
377 /* Like R_PPC_REL24, but referring to the procedure linkage table
378 entry for the symbol. */
393 /* This is used only by the dynamic linker. The symbol should exist
394 both in the object being run and in some shared library. The
395 dynamic linker copies the data addressed by the symbol from the
396 shared library into the object, because the object being
397 run has to have the data at some particular address. */
412 /* Like R_PPC_ADDR32, but used when setting global offset table
413 entries. */
428 /* Marks a procedure linkage table entry for a symbol. */
443 /* Used only by the dynamic linker. When the object is run, this
444 longword is set to the load address of the object, plus the
445 addend. */
460 /* Like R_PPC_REL24, but uses the value of the symbol within the
461 object rather than the final value. Normally used for
462 _GLOBAL_OFFSET_TABLE_. */
477 /* Like R_PPC_ADDR32, but may be unaligned. */
492 /* Like R_PPC_ADDR16, but may be unaligned. */
507 /* 32-bit PC relative */
522 /* 32-bit relocation to the symbol's procedure linkage table.
523 FIXME: not supported. */
538 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
539 FIXME: not supported. */
554 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
555 the symbol. */
570 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
571 the symbol. */
586 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
587 the symbol. */
602 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
603 small data items. */
618 /* 16-bit section relative relocation. */
633 /* 16-bit lower half section relative relocation. */
648 /* 16-bit upper half section relative relocation. */
663 /* 16-bit upper half adjusted section relative relocation. */
678 /* Marker reloc for TLS. */
693 /* Computes the load module index of the load module that contains the
694 definition of its TLS sym. */
709 /* Computes a dtv-relative displacement, the difference between the value
710 of sym+add and the base address of the thread-local storage block that
711 contains the definition of sym, minus 0x8000. */
726 /* A 16 bit dtprel reloc. */
741 /* Like DTPREL16, but no overflow. */
756 /* Like DTPREL16_LO, but next higher group of 16 bits. */
771 /* Like DTPREL16_HI, but adjust for low 16 bits. */
786 /* Computes a tp-relative displacement, the difference between the value of
787 sym+add and the value of the thread pointer (r13). */
802 /* A 16 bit tprel reloc. */
817 /* Like TPREL16, but no overflow. */
832 /* Like TPREL16_LO, but next higher group of 16 bits. */
847 /* Like TPREL16_HI, but adjust for low 16 bits. */
862 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
863 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset
864 to the first entry. */
879 /* Like GOT_TLSGD16, but no overflow. */
894 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */
909 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */
924 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
925 with values (sym+add)@dtpmod and zero, and computes the offset to the
926 first entry. */
941 /* Like GOT_TLSLD16, but no overflow. */
956 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */
971 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */
986 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes
987 the offset to the entry. */
1002 /* Like GOT_DTPREL16, but no overflow. */
1017 /* Like GOT_DTPREL16_LO, but next higher group of 16 bits. */
1032 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */
1047 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the
1048 offset to the entry. */
1063 /* Like GOT_TPREL16, but no overflow. */
1078 /* Like GOT_TPREL16_LO, but next higher group of 16 bits. */
1093 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */
1108 /* The remaining relocs are from the Embedded ELF ABI, and are not
1109 in the SVR4 ELF ABI. */
1111 /* 32 bit value resulting from the addend minus the symbol. */
1126 /* 16 bit value resulting from the addend minus the symbol. */
1141 /* 16 bit value resulting from the addend minus the symbol. */
1156 /* The high order 16 bits of the addend minus the symbol. */
1171 /* The high order 16 bits of the result of the addend minus the address,
1172 plus 1 if the contents of the low 16 bits, treated as a signed number,
1173 is negative. */
1188 /* 16 bit value resulting from allocating a 4 byte word to hold an
1189 address in the .sdata section, and returning the offset from
1190 _SDA_BASE_ for that relocation. */
1205 /* 16 bit value resulting from allocating a 4 byte word to hold an
1206 address in the .sdata2 section, and returning the offset from
1207 _SDA2_BASE_ for that relocation. */
1222 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
1223 small data items. */
1238 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
1239 signed offset from the appropriate base, and filling in the register
1240 field with the appropriate register (0, 2, or 13). */
1255 /* Relocation not handled: R_PPC_EMB_MRKREF */
1256 /* Relocation not handled: R_PPC_EMB_RELSEC16 */
1257 /* Relocation not handled: R_PPC_EMB_RELST_LO */
1258 /* Relocation not handled: R_PPC_EMB_RELST_HI */
1259 /* Relocation not handled: R_PPC_EMB_RELST_HA */
1260 /* Relocation not handled: R_PPC_EMB_BIT_FLD */
1262 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
1263 in the 16 bit signed offset from the appropriate base, and filling in the
1264 register field with the appropriate register (0, 2, or 13). */
1279 /* A 16 bit relative relocation. */
1294 /* A 16 bit relative relocation without overflow. */
1309 /* The high order 16 bits of a relative address. */
1324 /* The high order 16 bits of a relative address, plus 1 if the contents of
1325 the low 16 bits, treated as a signed number, is negative. */
1340 /* GNU extension to record C++ vtable hierarchy. */
1355 /* GNU extension to record C++ vtable member usage. */
1370 /* Phony reloc to handle AIX style TOC entries. */
1384 };
1385 \f
1386 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
1388 static void
1390 {
1395 i++)
1396 {
1402 }
1403 }
1407 bfd_reloc_code_real_type code)
1408 {
1411 /* Initialize howto table if not already done. */
1416 {
1505 }
1508 };
1510 /* Set the howto pointer for a PowerPC ELF reloc. */
1512 static void
1516 {
1517 /* Initialize howto table if not already done. */
1523 }
1525 /* Handle the R_PPC_ADDR16_HA and R_PPC_REL16_HA relocs. */
1527 static bfd_reloc_status_type
1535 {
1536 bfd_vma relocation;
1539 {
1542 }
1549 else
1561 }
1563 static bfd_reloc_status_type
1571 {
1572 /* If this is a relocatable link (output_bfd test tells us), just
1573 call the generic function. Any adjustment will be done at final
1574 link time. */
1580 {
1585 }
1587 }
1588 \f
1589 /* Sections created by the linker. */
1592 {
1593 /* Pointer to the bfd section. */
1595 /* Section name. */
1597 /* Associated bss section name. */
1599 /* Associated symbol name. */
1601 /* Value of symbol. */
1602 bfd_vma sym_val;
1605 /* Linked list of allocated pointer entries. This hangs off of the
1606 symbol lists, and provides allows us to return different pointers,
1607 based on different addend's. */
1610 {
1611 /* next allocated pointer for this symbol */
1613 /* offset of pointer from beginning of section */
1614 bfd_vma offset;
1615 /* addend used */
1616 bfd_vma addend;
1617 /* which linker section this is */
1621 struct ppc_elf_obj_tdata
1622 {
1625 /* A mapping from local symbols to offsets into the various linker
1626 sections added. This is index by the symbol index. */
1628 };
1630 #define ppc_elf_tdata(bfd) \
1631 ((struct ppc_elf_obj_tdata *) (bfd)->tdata.any)
1633 #define elf_local_ptr_offsets(bfd) \
1634 (ppc_elf_tdata (bfd)->linker_section_pointers)
1636 /* Override the generic function because we store some extras. */
1638 static bfd_boolean
1640 {
1646 }
1648 /* Fix bad default arch selected for a 32 bit input bfd when the
1649 default is 64 bit. */
1651 static bfd_boolean
1653 {
1655 {
1659 {
1660 /* Relies on arch after 64 bit default being 32 bit default. */
1663 }
1664 }
1666 }
1668 /* Function to set whether a module needs the -mrelocatable bit set. */
1670 static bfd_boolean
1672 {
1679 }
1681 /* Support for core dump NOTE sections. */
1683 static bfd_boolean
1685 {
1690 {
1695 /* pr_cursig */
1698 /* pr_pid */
1701 /* pr_reg */
1706 }
1708 /* Make a ".reg/999" section. */
1711 }
1713 static bfd_boolean
1715 {
1717 {
1726 }
1728 /* Note that for some reason, a spurious space is tacked
1729 onto the end of the args in some (at least one anyway)
1730 implementations, so strip it off if it exists. */
1732 {
1738 }
1741 }
1743 /* Return address for Ith PLT stub in section PLT, for relocation REL
1744 or (bfd_vma) -1 if it should not be included. */
1746 static bfd_vma
1750 {
1752 }
1754 /* Handle a PowerPC specific section when reading an object file. This
1755 is called when bfd_section_from_shdr finds a section with an unknown
1756 type. */
1758 static bfd_boolean
1763 {
1765 flagword flags;
1780 }
1782 /* Set up any other section flags and such that may be necessary. */
1784 static bfd_boolean
1788 {
1796 }
1798 /* If we have .sbss2 or .PPC.EMB.sbss0 output sections, we
1799 need to bump up the number of section headers. */
1801 static int
1803 {
1816 }
1818 /* Add extra PPC sections -- Note, for now, make .sbss2 and
1819 .PPC.EMB.sbss0 a normal section, and not a bss section so
1820 that the linker doesn't crater when trying to make more than
1821 2 sections. */
1824 ppc_special_sections_p[] =
1825 {
1828 };
1831 ppc_special_sections_s[] =
1832 {
1838 };
1841 ppc_special_sections_t[] =
1842 {
1845 };
1848 ppc_special_sections_other[]=
1849 {
1854 };
1858 {
1886 };
1887 \f
1888 /* Very simple linked list structure for recording apuinfo values. */
1890 {
1893 }
1894 apuinfo_list;
1899 static void
1901 {
1903 }
1905 static void
1907 {
1911 {
1915 }
1924 }
1926 static unsigned
1928 {
1933 entry;
1938 }
1942 {
1948 ;
1951 }
1953 static void
1955 {
1959 {
1963 }
1966 }
1971 /* Scan the input BFDs and create a linked list of
1972 the APUinfo values that will need to be emitted. */
1974 static void
1976 {
1981 bfd_size_type output_section_size;
1991 /* Scan the input bfds, looking for apuinfo sections. */
1996 {
1999 {
2002 }
2003 }
2005 /* We need at least one input sections
2006 in order to make merging worthwhile. */
2010 /* Just make sure that the output section exists as well. */
2015 /* Allocate a buffer for the contents of the input sections. */
2023 /* Read in the input sections contents. */
2025 {
2035 {
2038 }
2042 {
2045 }
2047 /* Process the contents of the section. */
2051 /* Verify the contents of the header. Note - we have to
2052 extract the values this way in order to allow for a
2053 host whose endian-ness is different from the target. */
2065 /* Get the number of bytes used for apuinfo entries. */
2070 /* Make sure that we do not run off the end of the section. */
2074 /* Scan the apuinfo section, building a list of apuinfo numbers. */
2078 /* Update the offset. */
2080 }
2084 /* Compute the size of the output section. */
2094 fail:
2099 }
2101 /* Prevent the output section from accumulating the input sections'
2102 contents. We have already stored this in our linked list structure. */
2104 static bfd_boolean
2108 {
2111 }
2113 /* Finally we can generate the output section. */
2115 static void
2117 {
2122 bfd_size_type length;
2137 {
2141 }
2143 /* Create the apuinfo header. */
2152 {
2155 }
2166 }
2167 \f
2168 /* The following functions are specific to the ELF linker, while
2169 functions above are used generally. They appear in this file more
2170 or less in the order in which they are called. eg.
2171 ppc_elf_check_relocs is called early in the link process,
2172 ppc_elf_finish_dynamic_sections is one of the last functions
2173 called. */
2175 /* The PPC linker needs to keep track of the number of relocs that it
2176 decides to copy as dynamic relocs in check_relocs for each symbol.
2177 This is so that it can later discard them if they are found to be
2178 unnecessary. We store the information in a field extending the
2179 regular ELF linker hash table. */
2181 struct ppc_elf_dyn_relocs
2182 {
2185 /* The input section of the reloc. */
2188 /* Total number of relocs copied for the input section. */
2189 bfd_size_type count;
2191 /* Number of pc-relative relocs copied for the input section. */
2192 bfd_size_type pc_count;
2193 };
2195 /* Of those relocs that might be copied as dynamic relocs, this macro
2196 selects those that must be copied when linking a shared library,
2197 even when the symbol is local. */
2199 #define MUST_BE_DYN_RELOC(RTYPE) \
2200 ((RTYPE) != R_PPC_REL24 \
2201 && (RTYPE) != R_PPC_REL14 \
2202 && (RTYPE) != R_PPC_REL14_BRTAKEN \
2203 && (RTYPE) != R_PPC_REL14_BRNTAKEN \
2204 && (RTYPE) != R_PPC_REL32)
2206 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
2207 copying dynamic variables from a shared lib into an app's dynbss
2208 section, and instead use a dynamic relocation to point into the
2209 shared lib. */
2210 #define ELIMINATE_COPY_RELOCS 1
2212 /* PPC ELF linker hash entry. */
2214 struct ppc_elf_link_hash_entry
2215 {
2218 /* If this symbol is used in the linker created sections, the processor
2219 specific backend uses this field to map the field into the offset
2220 from the beginning of the section. */
2223 /* Track dynamic relocs copied for this symbol. */
2226 /* Contexts in which symbol is used in the GOT (or TOC).
2227 TLS_GD .. TLS_TLS bits are or'd into the mask as the
2228 corresponding relocs are encountered during check_relocs.
2229 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
2230 indicate the corresponding GOT entry type is not needed. */
2238 };
2240 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent))
2242 /* PPC ELF linker hash table. */
2244 struct ppc_elf_link_hash_table
2245 {
2248 /* Short-cuts to get to dynamic linker sections. */
2261 /* Shortcut to .__tls_get_addr. */
2264 /* TLS local dynamic got entry handling. */
2266 bfd_signed_vma refcount;
2267 bfd_vma offset;
2270 /* Offset of PltResolve function in glink. */
2271 bfd_vma glink_pltresolve;
2273 /* Size of reserved GOT entries. */
2275 /* Non-zero if allocating the header left a gap. */
2278 /* Whether to use new plt/got layout or not. */
2282 /* Small local sym to section mapping cache. */
2284 };
2286 /* Get the PPC ELF linker hash table from a link_info structure. */
2288 #define ppc_elf_hash_table(p) \
2289 ((struct ppc_elf_link_hash_table *) (p)->hash)
2291 /* Create an entry in a PPC ELF linker hash table. */
2297 {
2298 /* Allocate the structure if it has not already been allocated by a
2299 subclass. */
2301 {
2306 }
2308 /* Call the allocation method of the superclass. */
2311 {
2315 }
2318 }
2320 /* Create a PPC ELF linker hash table. */
2324 {
2332 ppc_elf_link_hash_newfunc))
2333 {
2336 }
2347 }
2349 /* The powerpc .got has a blrl instruction in it. Mark it executable. */
2351 static bfd_boolean
2353 {
2356 flagword flags;
2379 }
2381 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2382 to output sections (just like _bfd_elf_create_dynamic_sections has
2383 to create .dynbss and .rela.bss). */
2385 static bfd_boolean
2387 {
2390 flagword flags;
2418 {
2425 }
2434 }
2436 /* Copy the extra info we tack onto an elf_link_hash_entry. */
2438 static void
2442 {
2449 {
2451 {
2458 /* Add reloc counts against the weak sym to the strong sym
2459 list. Merge any entries against the same section. */
2461 {
2466 {
2471 }
2474 }
2476 }
2480 }
2487 {
2488 /* If called to transfer flags for a weakdef during processing
2489 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
2490 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
2495 }
2496 else
2498 }
2500 /* Return 1 if target is one of ours. */
2502 static bfd_boolean
2504 {
2509 }
2511 /* Hook called by the linker routine which adds symbols from an object
2512 file. We use it to put .comm items in .sbss, and not .bss. */
2514 static bfd_boolean
2522 {
2527 {
2528 /* Common symbols less than or equal to -G nn bytes are automatically
2529 put into .sbss. */
2534 {
2542 flags);
2545 }
2549 }
2552 }
2553 \f
2554 /* Create a special linker section. */
2556 static bfd_boolean
2559 flagword flags,
2561 {
2568 /* Record the first bfd that needs the special sections. */
2574 flags);
2581 }
2583 /* Find a linker generated pointer with a given addend and type. */
2586 elf_find_pointer_linker_section
2588 bfd_vma addend,
2590 {
2596 }
2598 /* Allocate a pointer to live in a linker created section. */
2600 static bfd_boolean
2605 {
2609 bfd_size_type amt;
2613 /* Is this a global symbol? */
2615 {
2618 /* Has this symbol already been allocated? If so, our work is done. */
2622 lsect))
2626 }
2627 else
2628 {
2629 /* Allocation of a pointer to a local symbol. */
2632 /* Allocate a table to hold the local symbols if first time. */
2634 {
2645 }
2647 /* Has this symbol already been allocated? If so, our work is done. */
2650 lsect))
2654 }
2656 /* Allocate space for a pointer in the linker section, and allocate
2657 a new pointer record from internal memory. */
2673 #ifdef DEBUG
2678 #endif
2681 }
2683 static bfd_boolean
2688 {
2693 {
2701 }
2707 }
2709 static void
2711 {
2714 abfd,
2717 }
2719 /* Look through the relocs for a section during the first phase, and
2720 allocate space in the global offset table or procedure linkage
2721 table. */
2723 static bfd_boolean
2728 {
2739 /* Don't do anything special with non-loaded, non-alloced sections.
2740 In particular, any relocs in such sections should not affect GOT
2741 and PLT reference counting (ie. we don't allow them to create GOT
2742 or PLT entries), there's no possibility or desire to optimize TLS
2743 relocs, and there's not much point in propagating relocs to shared
2744 libs that the dynamic linker won't relocate. */
2748 #ifdef DEBUG
2751 #endif
2753 /* Initialize howto table if not already done. */
2764 {
2773 else
2776 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
2777 This shows up in particular in an R_PPC_ADDR32 in the eabi
2778 startup code. */
2782 {
2788 }
2792 {
2822 dogottls:
2824 /* Fall thru */
2826 /* GOT16 relocations */
2831 /* This symbol requires a global offset table entry. */
2833 {
2838 }
2840 {
2843 }
2844 else
2845 /* This is a global offset table entry for a local symbol. */
2850 /* Indirect .sdata relocation. */
2853 {
2856 }
2866 /* Indirect .sdata2 relocation. */
2869 {
2872 }
2892 {
2895 }
2904 #ifdef DEBUG
2906 #endif
2907 /* This symbol requires a procedure linkage table entry. We
2908 actually build the entry in finish_dynamic_symbol,
2909 because this might be a case of linking PIC code without
2910 linking in any dynamic objects, in which case we don't
2911 need to generate a procedure linkage table after all. */
2914 {
2915 /* It does not make sense to have a procedure linkage
2916 table entry for a local symbol. */
2919 abfd,
2920 sec,
2925 }
2931 /* The following relocations don't need to propagate the
2932 relocation if linking a shared object since they are
2933 section relative. */
2952 /* This are just markers. */
2959 /* These should only appear in dynamic objects. */
2966 /* These aren't handled yet. We'll report an error later. */
2975 /* This refers only to functions defined in the shared library. */
2981 /* This relocation describes the C++ object vtable hierarchy.
2982 Reconstruct it for later use during GC. */
2988 /* This relocation describes which C++ vtable entries are actually
2989 used. Record for later use during GC. */
2995 /* We shouldn't really be seeing these. */
3001 /* Nor these. */
3014 /* When creating a shared object, we must copy these
3015 relocs into the output file. We create a reloc
3016 section in dynobj and make room for the reloc. */
3025 {
3028 }
3029 /* fall through */
3043 {
3044 /* We may need a plt entry if the symbol turns out to be
3045 a function defined in a dynamic object. */
3048 /* We may need a copy reloc too. */
3050 }
3052 dodyn:
3053 /* If we are creating a shared library, and this is a reloc
3054 against a global symbol, or a non PC relative reloc
3055 against a local symbol, then we need to copy the reloc
3056 into the shared library. However, if we are linking with
3057 -Bsymbolic, we do not need to copy a reloc against a
3058 global symbol which is defined in an object we are
3059 including in the link (i.e., DEF_REGULAR is set). At
3060 this point we have not seen all the input files, so it is
3061 possible that DEF_REGULAR is not set now but will be set
3062 later (it is never cleared). In case of a weak definition,
3063 DEF_REGULAR may be cleared later by a strong definition in
3064 a shared library. We account for that possibility below by
3065 storing information in the dyn_relocs field of the hash
3066 table entry. A similar situation occurs when creating
3067 shared libraries and symbol visibility changes render the
3068 symbol local.
3070 If on the other hand, we are creating an executable, we
3071 may need to keep relocations for symbols satisfied by a
3072 dynamic library if we manage to avoid copy relocs for the
3073 symbol. */
3080 || (ELIMINATE_COPY_RELOCS
3085 {
3089 #ifdef DEBUG
3091 "ppc_elf_check_relocs needs to "
3095 #endif
3097 {
3100 name = (bfd_elf_string_from_elf_section
3115 {
3116 flagword flags;
3122 name,
3123 flags);
3128 }
3130 }
3132 /* If this is a global symbol, we count the number of
3133 relocations we need for this symbol. */
3135 {
3137 }
3138 else
3139 {
3140 /* Track dynamic relocs needed for local syms too.
3141 We really need local syms available to do this
3142 easily. Oh well. */
3152 }
3156 {
3165 }
3170 }
3173 }
3174 }
3177 }
3178 \f
3179 /* Merge backend specific data from an object file to the output
3180 object file when linking. */
3182 static bfd_boolean
3184 {
3185 flagword old_flags;
3186 flagword new_flags;
3187 bfd_boolean error;
3193 /* Check if we have the same endianess. */
3200 {
3201 /* First call, no flags set. */
3204 }
3206 /* Compatible flags are ok. */
3208 ;
3210 /* Incompatible flags. */
3211 else
3212 {
3213 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
3214 to be linked with either. */
3218 {
3223 }
3226 {
3231 }
3233 /* The output is -mrelocatable-lib iff both the input files are. */
3237 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
3238 but each input file is either -mrelocatable or -mrelocatable-lib. */
3244 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
3245 any module uses it. */
3251 /* Warn about any other mismatches. */
3253 {
3259 }
3262 {
3265 }
3266 }
3269 }
3270 \f
3271 /* Choose which PLT scheme to use, and set .plt flags appropriately.
3272 Returns -1 on error, 0 for old PLT, 1 for new PLT. */
3273 int
3277 {
3285 {
3289 /* The new PLT is a loaded section. */
3294 /* The new GOT is not executable. */
3298 }
3299 else
3300 {
3301 /* Stop an unused .glink section from affecting .text alignment. */
3305 }
3307 }
3308 \f
3309 /* Return the section that should be marked against GC for a given
3310 relocation. */
3318 {
3320 {
3322 {
3329 {
3339 }
3340 }
3341 }
3342 else
3346 }
3348 /* Update the got, plt and dynamic reloc reference counts for the
3349 section being removed. */
3351 static bfd_boolean
3356 {
3375 {
3382 {
3394 {
3395 /* Everything must go for SEC. */
3398 }
3399 }
3403 {
3409 /* Fall thru */
3428 {
3431 }
3433 {
3436 }
3446 /* Fall thru */
3465 {
3468 }
3473 }
3474 }
3476 }
3477 \f
3478 /* Set htab->tls_get_addr and call the generic ELF tls_setup function. */
3480 asection *
3482 {
3489 {
3492 }
3497 }
3499 /* Run through all the TLS relocs looking for optimization
3500 opportunities. */
3502 bfd_boolean
3505 {
3515 {
3521 {
3525 /* Read the relocations. */
3534 {
3540 bfd_boolean is_local;
3544 {
3552 }
3561 {
3566 /* These relocs should never be against a symbol
3567 defined in a shared lib. Leave them alone if
3568 that turns out to be the case. */
3574 /* LD -> LE */
3585 /* GD -> LE */
3587 else
3588 /* GD -> IE */
3600 {
3601 /* IE -> LE */
3605 }
3606 else
3616 {
3619 }
3626 }
3629 {
3631 {
3632 /* We managed to get rid of a got entry. */
3635 }
3637 }
3638 else
3639 {
3645 {
3652 {
3656 }
3657 }
3663 {
3664 /* We managed to get rid of a got entry. */
3667 }
3670 }
3674 }
3678 }
3682 {
3685 else
3687 }
3688 }
3690 }
3691 \f
3692 /* Adjust a symbol defined by a dynamic object and referenced by a
3693 regular object. The current definition is in some section of the
3694 dynamic object, but we're not including those sections. We have to
3695 change the definition to something the rest of the link can
3696 understand. */
3698 static bfd_boolean
3701 {
3706 #ifdef DEBUG
3709 #endif
3711 /* Make sure we know what is going on here. */
3720 /* Deal with function syms. */
3723 {
3724 /* Clear procedure linkage table information for any symbol that
3725 won't need a .plt entry. */
3730 {
3731 /* A PLT entry is not required/allowed when:
3733 1. We are not using ld.so; because then the PLT entry
3734 can't be set up, so we can't use one. In this case,
3735 ppc_elf_adjust_dynamic_symbol won't even be called.
3737 2. GC has rendered the entry unused.
3739 3. We know for certain that a call to this symbol
3740 will go to this object, or will remain undefined. */
3743 }
3745 }
3746 else
3749 /* If this is a weak symbol, and there is a real definition, the
3750 processor independent code will have arranged for us to see the
3751 real definition first, and we can just use the same value. */
3753 {
3761 }
3763 /* This is a reference to a symbol defined by a dynamic object which
3764 is not a function. */
3766 /* If we are creating a shared library, we must presume that the
3767 only references to the symbol are via the global offset table.
3768 For such cases we need not do anything here; the relocations will
3769 be handled correctly by relocate_section. */
3773 /* If there are no references to this symbol that do not use the
3774 GOT, we don't need to generate a copy reloc. */
3779 {
3782 {
3786 }
3788 /* If we didn't find any dynamic relocs in read-only sections, then
3789 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
3791 {
3794 }
3795 }
3797 /* We must allocate the symbol in our .dynbss section, which will
3798 become part of the .bss section of the executable. There will be
3799 an entry for this symbol in the .dynsym section. The dynamic
3800 object will contain position independent code, so all references
3801 from the dynamic object to this symbol will go through the global
3802 offset table. The dynamic linker will use the .dynsym entry to
3803 determine the address it must put in the global offset table, so
3804 both the dynamic object and the regular object will refer to the
3805 same memory location for the variable.
3807 Of course, if the symbol is sufficiently small, we must instead
3808 allocate it in .sbss. FIXME: It would be better to do this if and
3809 only if there were actually SDAREL relocs for that symbol. */
3813 else
3817 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
3818 copy the initial value out of the dynamic object and into the
3819 runtime process image. We need to remember the offset into the
3820 .rela.bss section we are going to use. */
3822 {
3827 else
3832 }
3834 /* We need to figure out the alignment required for this symbol. I
3835 have no idea how ELF linkers handle this. */
3840 /* Apply the required alignment. */
3843 {
3846 }
3848 /* Define the symbol as being at this point in the section. */
3852 /* Increment the section size to make room for the symbol. */
3856 }
3857 \f
3858 /* Allocate NEED contiguous space in .got, and return the offset.
3859 Handles allocation of the got header when crossing 32k. */
3861 static bfd_vma
3863 {
3864 bfd_vma where;
3871 {
3874 }
3875 else
3876 {
3879 {
3882 }
3885 }
3887 }
3889 /* Allocate space in associated reloc sections for dynamic relocs. */
3891 static bfd_boolean
3893 {
3903 /* When warning symbols are created, they **replace** the "real"
3904 entry in the hash table, thus we never get to see the real
3905 symbol in a hash traversal. So look at it now. */
3911 {
3912 /* Make sure this symbol is output as a dynamic symbol. */
3915 {
3918 }
3922 {
3926 {
3933 {
3936 }
3938 }
3939 else
3940 {
3941 /* If this is the first .plt entry, make room for the
3942 special first entry. */
3946 /* The PowerPC PLT is actually composed of two parts, the
3947 first part is 2 words (for a load and a jump), and then
3948 there is a remaining word available at the end. */
3950 + (PLT_SLOT_SIZE
3954 /* If this symbol is not defined in a regular file, and we
3955 are not generating a shared library, then set the symbol
3956 to this location in the .plt. This is required to make
3957 function pointers compare as equal between the normal
3958 executable and the shared library. */
3961 {
3964 }
3966 /* Make room for this entry. After the 8192nd entry, room
3967 for two entries is allocated. */
3972 }
3974 /* We also need to make an entry in the .rela.plt section. */
3976 }
3977 else
3978 {
3981 }
3982 }
3983 else
3984 {
3987 }
3991 {
3992 /* Make sure this symbol is output as a dynamic symbol. */
3995 {
3998 }
4002 /* If just an LD reloc, we'll just use htab->tlsld_got.offset. */
4004 else
4005 {
4006 bfd_boolean dyn;
4009 {
4018 }
4019 else
4027 {
4028 /* All the entries we allocated need relocs.
4029 Except LD only needs one. */
4033 }
4034 }
4035 }
4036 else
4042 /* In the shared -Bsymbolic case, discard space allocated for
4043 dynamic pc-relative relocs against symbols which turn out to be
4044 defined in regular objects. For the normal shared case, discard
4045 space for relocs that have become local due to symbol visibility
4046 changes. */
4049 {
4050 /* Relocs that use pc_count are those that appear on a call insn,
4051 or certain REL relocs (see MUST_BE_DYN_RELOC) that can be
4052 generated via assembly. We want calls to protected symbols to
4053 resolve directly to the function rather than going via the plt.
4054 If people want function pointer comparisons to work as expected
4055 then they should avoid writing weird assembly. */
4057 {
4061 {
4066 else
4068 }
4069 }
4071 /* Also discard relocs on undefined weak syms with non-default
4072 visibility. */
4077 /* Make sure undefined weak symbols are output as a dynamic symbol
4078 in PIEs. */
4084 {
4087 }
4088 }
4090 {
4091 /* For the non-shared case, discard space for relocs against
4092 symbols which turn out to need copy relocs or are not
4093 dynamic. */
4098 {
4099 /* Make sure this symbol is output as a dynamic symbol.
4100 Undefined weak syms won't yet be marked as dynamic. */
4103 {
4106 }
4108 /* If that succeeded, we know we'll be keeping all the
4109 relocs. */
4112 }
4116 keep: ;
4117 }
4119 /* Finally, allocate space. */
4121 {
4124 }
4127 }
4129 /* Find any dynamic relocs that apply to read-only sections. */
4131 static bfd_boolean
4133 {
4143 {
4149 {
4152 /* Not an error, just cut short the traversal. */
4154 }
4155 }
4157 }
4159 /* Set the sizes of the dynamic sections. */
4161 static bfd_boolean
4164 {
4167 bfd_boolean relocs;
4170 #ifdef DEBUG
4172 #endif
4178 {
4179 /* Set the contents of the .interp section to the interpreter. */
4181 {
4186 }
4187 }
4191 else
4194 /* Set up .got offsets for local syms, and space for local dynamic
4195 relocs. */
4197 {
4201 bfd_size_type locsymcount;
4208 {
4215 {
4218 {
4219 /* Input section has been discarded, either because
4220 it is a copy of a linkonce section or due to
4221 linker script /DISCARD/, so we'll be discarding
4222 the relocs too. */
4223 }
4225 {
4232 }
4233 }
4234 }
4246 {
4248 {
4249 /* If just an LD reloc, we'll just use
4250 htab->tlsld_got.offset. */
4253 }
4254 else
4255 {
4258 {
4265 }
4266 else
4272 }
4273 }
4274 else
4276 }
4279 {
4283 }
4284 else
4287 /* Allocate space for global sym dynamic relocs. */
4291 {
4294 /* If we haven't allocated the header, do so now. */
4296 {
4299 }
4304 }
4307 {
4309 /* Space for the branch table. */
4311 /* Pad out to align the start of PLTresolve. */
4314 }
4316 /* We've now determined the sizes of the various dynamic sections.
4317 Allocate memory for them. */
4320 {
4328 {
4329 /* Strip this section if we don't need it; see the
4330 comment below. */
4331 }
4334 {
4335 /* Strip these too. */
4336 }
4338 {
4340 {
4341 /* If we don't need this section, strip it from the
4342 output file. This is mostly to handle .rela.bss and
4343 .rela.plt. We must create both sections in
4344 create_dynamic_sections, because they must be created
4345 before the linker maps input sections to output
4346 sections. The linker does that before
4347 adjust_dynamic_symbol is called, and it is that
4348 function which decides whether anything needs to go
4349 into these sections. */
4350 }
4351 else
4352 {
4353 /* Remember whether there are any relocation sections. */
4356 /* We use the reloc_count field as a counter if we need
4357 to copy relocs into the output file. */
4359 }
4360 }
4361 else
4362 {
4363 /* It's not one of our sections, so don't allocate space. */
4365 }
4368 {
4371 }
4376 /* Allocate memory for the section contents. */
4380 }
4383 {
4384 /* Add some entries to the .dynamic section. We fill in the
4385 values later, in ppc_elf_finish_dynamic_sections, but we
4386 must add the entries now so that we get the correct size for
4387 the .dynamic section. The DT_DEBUG entry is filled in by the
4388 dynamic linker and used by the debugger. */
4389 #define add_dynamic_entry(TAG, VAL) \
4390 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
4393 {
4396 }
4399 {
4405 }
4408 {
4411 }
4414 {
4419 }
4421 /* If any dynamic relocs apply to a read-only section, then we
4422 need a DT_TEXTREL entry. */
4425 info);
4428 {
4431 }
4432 }
4433 #undef add_dynamic_entry
4436 }
4437 \f
4438 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
4441 {
4450 };
4453 {
4458 };
4460 static bfd_boolean
4465 {
4466 struct one_fixup
4467 {
4470 bfd_vma toff;
4471 bfd_vma trampoff;
4472 };
4480 bfd_boolean changed;
4482 bfd_size_type trampoff;
4486 /* Nothing to do if there are no relocations, and no need to do
4487 anything with non-alloc sections. */
4494 /* Space for a branch around any trampolines. */
4499 /* Get a copy of the native relocations. */
4509 {
4521 {
4536 }
4538 /* Get the value of the symbol referred to by the reloc. */
4540 {
4541 /* A local symbol. */
4544 /* Read this BFD's local symbols. */
4546 {
4554 }
4562 else
4567 }
4568 else
4569 {
4570 /* Global symbol handling. */
4584 {
4586 {
4589 }
4590 else
4591 {
4594 }
4595 }
4598 {
4601 }
4602 else
4606 }
4608 /* If the branch and target are in the same section, you have
4609 no hope of adding stubs. We'll error out later should the
4610 branch overflow. */
4614 /* There probably isn't any reason to handle symbols in
4615 SEC_MERGE sections; SEC_MERGE doesn't seem a likely
4616 attribute for a code section, and we are only looking at
4617 branches. However, implement it correctly here as a
4618 reference for other target relax_section functions. */
4620 {
4621 /* At this stage in linking, no SEC_MERGE symbol has been
4622 adjusted, so all references to such symbols need to be
4623 passed through _bfd_merged_section_offset. (Later, in
4624 relocate_section, all SEC_MERGE symbols *except* for
4625 section symbols have been adjusted.)
4627 gas may reduce relocations against symbols in SEC_MERGE
4628 sections to a relocation against the section symbol when
4629 the original addend was zero. When the reloc is against
4630 a section symbol we should include the addend in the
4631 offset passed to _bfd_merged_section_offset, since the
4632 location of interest is the original symbol. On the
4633 other hand, an access to "sym+addend" where "sym" is not
4634 a section symbol should not include the addend; Such an
4635 access is presumed to be an offset from "sym"; The
4636 location of interest is just "sym". */
4642 toff);
4646 }
4647 else
4655 /* If the branch is in range, no need to do anything. */
4659 /* Look for an existing fixup to this address. */
4665 {
4671 /* Oh dear, we can't reach a trampoline. Don't try to add
4672 one. We'll report an error later. */
4676 {
4680 }
4681 else
4682 {
4686 }
4695 /* Hijack the old relocation. Since we need two
4696 relocations for this use a "composite" reloc. */
4698 stub_rtype);
4701 /* Record the fixup so we don't do it again this section. */
4710 }
4711 else
4712 {
4717 /* Nop out the reloc, since we're finalizing things here. */
4719 }
4721 /* Get the section contents. */
4723 {
4724 /* Get cached copy if it exists. */
4727 else
4728 {
4729 /* Go get them off disk. */
4732 }
4733 }
4735 /* Fix up the existing branch to hit the trampoline. */
4738 {
4756 }
4757 }
4759 /* Write out the trampolines. */
4762 {
4765 bfd_vma val;
4768 do
4769 {
4773 }
4781 /* Branch around the trampolines. */
4789 {
4792 }
4793 else
4794 {
4797 }
4801 {
4803 i++;
4807 }
4809 }
4813 {
4816 else
4817 {
4818 /* Cache the symbols for elf_link_input_bfd. */
4820 }
4821 }
4825 {
4828 else
4829 {
4830 /* Cache the section contents for elf_link_input_bfd. */
4832 }
4833 }
4836 {
4839 else
4841 }
4846 error_return:
4856 }
4857 \f
4858 /* Set _SDA_BASE_, _SDA2_BASE, and sbss start and end syms. They are
4859 set here rather than via PROVIDE in the default linker script,
4860 because using PROVIDE inside an output section statement results in
4861 unnecessary output sections. Using PROVIDE outside an output section
4862 statement runs the risk of section alignment affecting where the
4863 section starts. */
4865 bfd_boolean
4867 {
4871 bfd_vma val;
4876 {
4893 }
4906 }
4907 \f
4908 /* Fill in the address for a pointer generated in a linker section. */
4910 static bfd_vma
4914 bfd_vma relocation,
4916 {
4922 {
4923 /* Handle global symbol. */
4929 }
4930 else
4931 {
4932 /* Handle local symbol. */
4937 }
4941 lsect);
4944 /* Offset will always be a multiple of four, so use the bottom bit
4945 as a "written" flag. */
4947 {
4952 }
4958 #ifdef DEBUG
4962 #endif
4964 /* Subtract out the addend, because it will get added back in by the normal
4965 processing. */
4967 }
4969 /* The RELOCATE_SECTION function is called by the ELF backend linker
4970 to handle the relocations for a section.
4972 The relocs are always passed as Rela structures; if the section
4973 actually uses Rel structures, the r_addend field will always be
4974 zero.
4976 This function is responsible for adjust the section contents as
4977 necessary, and (if using Rela relocs and generating a
4978 relocatable output file) adjusting the reloc addend as
4979 necessary.
4981 This function does not have to worry about setting the reloc
4982 address or the reloc symbol index.
4984 LOCAL_SYMS is a pointer to the swapped in local symbols.
4986 LOCAL_SECTIONS is an array giving the section in the input file
4987 corresponding to the st_shndx field of each local symbol.
4989 The global hash table entry for the global symbols can be found
4990 via elf_sym_hashes (input_bfd).
4992 When generating relocatable output, this function must handle
4993 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
4994 going to be the section symbol corresponding to the output
4995 section, which means that the addend must be adjusted
4996 accordingly. */
4998 static bfd_boolean
5007 {
5013 Elf_Internal_Rela outrel;
5019 #ifdef DEBUG
5025 #endif
5030 /* Initialize howto table if not already done. */
5041 {
5043 bfd_vma addend;
5044 bfd_reloc_status_type r;
5051 bfd_vma relocation;
5053 bfd_boolean unresolved_reloc;
5054 bfd_boolean warned;
5066 {
5072 }
5073 else
5074 {
5081 }
5083 /* TLS optimizations. Replace instruction sequences and relocs
5084 based on information we collected in tls_optimize. We edit
5085 RELOCS so that --emit-relocs will output something sensible
5086 for the final instruction stream. */
5090 {
5094 {
5098 }
5099 }
5101 /* Ensure reloc mapping code below stays sane. */
5112 {
5120 {
5121 bfd_vma insn;
5128 }
5134 {
5143 else
5146 /* add -> addi. */
5152 /* load and store indexed -> dform. */
5156 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
5161 /* lwax -> lwa. */
5163 else
5169 /* Was PPC_TLS which sits on insn boundary, now
5170 PPC_TPREL16_LO which is at insn+2. */
5172 }
5185 {
5186 tls_gdld_hi:
5190 else
5191 {
5195 }
5197 }
5210 {
5211 tls_get_addr_check:
5213 {
5218 bfd_vma offset;
5220 /* The next instruction should be a call to
5221 __tls_get_addr. Peek at the reloc to be sure. */
5239 /* OK, it checks out. Replace the call. */
5244 {
5245 /* IE */
5253 }
5254 else
5255 {
5256 /* LE */
5260 {
5261 /* Was an LD reloc. */
5265 }
5269 R_PPC_TPREL16_LO);
5271 }
5275 {
5276 /* We changed the symbol on an LD reloc. Start over
5277 in order to get h, sym, sec etc. right. */
5278 rel--;
5280 }
5281 }
5282 }
5284 }
5286 /* Handle other relocations that tweak non-addend part of insn. */
5289 {
5293 /* Branch taken prediction relocations. */
5297 /* Fall thru */
5299 /* Branch not taken prediction relocations. */
5310 /* Invert 'y' bit if not the default. */
5316 }
5324 {
5341 /* GOT16 relocations. Like an ADDR16 using the symbol's
5342 address in the GOT as relocation value instead of the
5343 symbol's value itself. Also, create a GOT entry for the
5344 symbol and put the symbol value there. */
5377 dogot:
5378 {
5379 /* Relocation is to the entry for this symbol in the global
5380 offset table. */
5381 bfd_vma off;
5394 {
5395 bfd_boolean dyn;
5400 /* This is actually a static link, or it is a
5401 -Bsymbolic link and the symbol is defined
5402 locally, or the symbol was forced to be local
5403 because of a version file. */
5404 ;
5405 else
5406 {
5409 }
5411 }
5412 else
5413 {
5417 }
5419 /* The offset must always be a multiple of 4. We use the
5420 least significant bit to record whether we have already
5421 processed this entry. */
5425 else
5426 {
5437 /* We might have multiple got entries for this sym.
5438 Initialize them all. */
5439 do
5440 {
5444 {
5447 }
5449 {
5452 }
5454 {
5457 }
5459 {
5462 }
5464 /* Generate relocs for the dynamic linker. */
5469 {
5475 {
5478 {
5485 outrel.r_info
5487 }
5488 }
5495 else
5498 {
5502 }
5507 }
5509 /* Init the .got section contents if we're not
5510 emitting a reloc. */
5511 else
5512 {
5518 {
5524 {
5528 }
5529 }
5532 }
5537 }
5542 }
5548 {
5550 {
5556 {
5560 {
5563 }
5564 }
5565 }
5566 }
5571 /* Addends on got relocations don't make much sense.
5572 x+off@got is actually x@got+off, and since the got is
5573 generated by a hash table traversal, the value in the
5574 got at entry m+n bears little relation to the entry m. */
5578 input_bfd,
5579 input_section,
5582 sym_name);
5583 }
5586 /* Relocations that need no special processing. */
5588 /* It makes no sense to point a local relocation
5589 at a symbol not in this object. */
5591 {
5594 input_bfd,
5595 input_section,
5597 TRUE))
5600 }
5610 /* Relocations that may need to be propagated if this is a shared
5611 object. */
5617 /* The TPREL16 relocs shouldn't really be used in shared
5618 libs as they will result in DT_TEXTREL being set, but
5619 support them anyway. */
5646 /* If these relocations are not to a named symbol, they can be
5647 handled right here, no need to bother the dynamic linker. */
5651 /* fall through */
5653 /* Relocations that always need to be propagated if this is a shared
5654 object. */
5666 /* r_symndx will be zero only for relocs against symbols
5667 from removed linkonce sections, or sections discarded by
5668 a linker script. */
5669 dodyn:
5672 /* Fall thru. */
5676 /* Fall thru. */
5684 || (ELIMINATE_COPY_RELOCS
5691 {
5694 #ifdef DEBUG
5699 #endif
5701 /* When generating a shared object, these relocations
5702 are copied into the output file to be resolved at run
5703 time. */
5705 {
5708 name = (bfd_elf_string_from_elf_section
5717 input_section),
5722 }
5738 {
5742 }
5743 else
5744 {
5749 else
5750 {
5756 {
5759 }
5760 else
5761 {
5764 /* We are turning this relocation into one
5765 against a section symbol. It would be
5766 proper to subtract the symbol's value,
5767 osec->vma, from the emitted reloc addend,
5768 but ld.so expects buggy relocs. */
5772 #ifdef DEBUG
5777 #endif
5778 }
5781 }
5782 }
5791 /* This reloc will be computed at runtime. We clear the memory
5792 so that it contains predictable value. */
5796 {
5800 }
5801 }
5814 else
5820 /* Fall thru */
5826 /* Fall thru */
5829 relax32:
5830 {
5837 /* We're clearing the bits for R_PPC_ADDR16_HA
5838 and R_PPC_ADDR16_LO here. */
5842 /* t0 is HA, t1 is LO */
5849 }
5852 /* Indirect .sdata relocation. */
5855 relocation
5860 /* Indirect .sdata2 relocation. */
5863 relocation
5868 /* Handle the TOC16 reloc. We want to use the offset within the .got
5869 section, not the actual VMA. This is appropriate when generating
5870 an embedded ELF object, for which the .got section acts like the
5871 AIX .toc section. */
5882 /* Relocation is to the entry for this symbol in the
5883 procedure linkage table. */
5888 {
5889 /* We didn't make a PLT entry for this symbol. This
5890 happens when statically linking PIC code, or when
5891 using -Bsymbolic. */
5893 }
5900 else
5906 /* Relocate against _SDA_BASE_. */
5908 {
5917 {
5921 input_bfd,
5922 sym_name,
5924 name);
5925 }
5927 }
5930 /* Relocate against _SDA2_BASE_. */
5932 {
5939 {
5943 input_bfd,
5944 sym_name,
5946 name);
5951 }
5953 }
5956 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
5959 {
5969 {
5972 }
5976 {
5979 }
5983 {
5985 }
5987 else
5988 {
5992 input_bfd,
5993 sym_name,
5995 name);
6000 }
6007 }
6008 }
6011 /* Relocate against the beginning of the section. */
6020 /* Negative relocations. */
6046 input_bfd,
6048 sym_name);
6053 }
6055 /* Do any further special processing. */
6057 {
6074 /* It's just possible that this symbol is a weak symbol
6075 that's not actually defined anywhere. In that case,
6076 'sec' would be NULL, and we should leave the symbol
6077 alone (it will be set to zero elsewhere in the link). */
6079 /* Add 0x10000 if sign bit in 0:15 is set.
6080 Bits 0:15 are not used. */
6083 }
6085 #ifdef DEBUG
6090 sym_name,
6091 r_symndx,
6094 #endif
6099 {
6102 input_bfd,
6103 input_section,
6106 sym_name);
6108 }
6111 input_bfd,
6112 input_section,
6113 contents,
6115 relocation,
6116 addend);
6119 {
6121 {
6127 {
6128 /* Assume this is a call protected by other code that
6129 detect the symbol is undefined. If this is the case,
6130 we can safely ignore the overflow. If not, the
6131 program is hosed anyway, and a little warning isn't
6132 going to help. */
6135 }
6139 sym_name,
6142 input_bfd,
6143 input_section,
6146 }
6147 else
6148 {
6154 }
6155 }
6156 }
6158 #ifdef DEBUG
6160 #endif
6163 }
6164 \f
6165 /* Finish up dynamic symbol handling. We set the contents of various
6166 dynamic sections here. */
6168 static bfd_boolean
6173 {
6176 #ifdef DEBUG
6179 #endif
6185 {
6186 Elf_Internal_Rela rela;
6188 bfd_vma reloc_index;
6190 #ifdef DEBUG
6192 #endif
6194 /* This symbol has an entry in the procedure linkage table. Set
6195 it up. */
6201 {
6202 /* We don't need to fill in the .plt. The ppc dynamic linker
6203 will fill it in. */
6204 }
6205 else
6206 {
6212 }
6214 /* Fill in the entry in the .rela.plt section. */
6223 else
6224 {
6229 }
6235 {
6236 /* Mark the symbol as undefined, rather than as defined in
6237 the .plt section. Leave the value alone. */
6239 /* If the symbol is weak, we do need to clear the value.
6240 Otherwise, the PLT entry would provide a definition for
6241 the symbol even if the symbol wasn't defined anywhere,
6242 and so the symbol would never be NULL. */
6245 }
6246 }
6249 {
6251 Elf_Internal_Rela rela;
6254 /* This symbols needs a copy reloc. Set it up. */
6256 #ifdef DEBUG
6258 #endif
6264 else
6275 }
6277 #ifdef DEBUG
6279 #endif
6281 /* Mark some specially defined symbols as absolute. */
6288 }
6289 \f
6290 static enum elf_reloc_type_class
6292 {
6294 {
6305 }
6306 }
6307 \f
6308 /* Finish up the dynamic sections. */
6310 static bfd_boolean
6313 {
6317 #ifdef DEBUG
6319 #endif
6325 {
6333 {
6334 Elf_Internal_Dyn dyn;
6340 {
6363 }
6366 }
6367 }
6369 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
6370 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
6372 {
6374 bfd_vma val;
6386 }
6389 {
6395 {
6396 SUB_11_11_30,
6397 ADD_0_11_11,
6398 ADD_11_0_11,
6399 LWZ_0_4_30,
6400 MTCTR_0,
6401 LWZ_12_8_30,
6402 BCTR,
6403 NOP,
6404 NOP,
6405 NOP
6406 };
6408 #define PPC_LO(v) ((v) & 0xffff)
6409 #define PPC_HI(v) (((v) >> 16) & 0xffff)
6410 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
6420 /* Write the plt call stubs. */
6424 {
6426 {
6435 }
6436 else
6437 {
6446 }
6448 }
6450 /* Now build the branch table, one for each plt entry (less one),
6451 and perhaps some padding. */
6455 {
6458 }
6460 {
6463 }
6469 /* Last comes the PLTresolve stub. */
6476 {
6479 }
6482 }
6485 }
6486 \f
6487 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
6489 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
6491 #define ELF_ARCH bfd_arch_powerpc
6492 #define ELF_MACHINE_CODE EM_PPC
6493 #ifdef __QNXTARGET__
6494 #define ELF_MAXPAGESIZE 0x1000
6495 #else
6496 #define ELF_MAXPAGESIZE 0x10000
6497 #endif
6498 #define ELF_MINPAGESIZE 0x1000
6499 #define elf_info_to_howto ppc_elf_info_to_howto
6501 #ifdef EM_CYGNUS_POWERPC
6502 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
6503 #endif
6505 #ifdef EM_PPC_OLD
6506 #define ELF_MACHINE_ALT2 EM_PPC_OLD
6507 #endif
6509 #define elf_backend_plt_not_loaded 1
6510 #define elf_backend_can_gc_sections 1
6511 #define elf_backend_can_refcount 1
6512 #define elf_backend_rela_normal 1
6514 #define bfd_elf32_mkobject ppc_elf_mkobject
6515 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
6516 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
6517 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
6518 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
6519 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create
6521 #define elf_backend_object_p ppc_elf_object_p
6522 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
6523 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
6524 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
6525 #define elf_backend_relocate_section ppc_elf_relocate_section
6526 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
6527 #define elf_backend_check_relocs ppc_elf_check_relocs
6528 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol
6529 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
6530 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
6531 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
6532 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
6533 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
6534 #define elf_backend_fake_sections ppc_elf_fake_sections
6535 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
6536 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
6537 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
6538 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
6539 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing
6540 #define elf_backend_final_write_processing ppc_elf_final_write_processing
6541 #define elf_backend_write_section ppc_elf_write_section
6542 #define elf_backend_special_sections ppc_elf_special_sections
6543 #define elf_backend_plt_sym_val ppc_elf_plt_sym_val