| blob | a2eec938b9e318b1c554e3ad6de24318cde5fea9 |
1 /* PowerPC-specific support for 32-bit ELF
2 Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
3 Free Software Foundation, Inc.
4 Written by Ian Lance Taylor, Cygnus Support.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the
20 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
23 /* This file is based on a preliminary PowerPC ELF ABI. The
24 information may not match the final PowerPC ELF ABI. It includes
25 suggestions from the in-progress Embedded PowerPC ABI, and that
26 information may also not match. */
36 /* RELA relocations are used here. */
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 /* The size in bytes of an entry in the procedure linkage table. */
55 #define PLT_ENTRY_SIZE 12
56 /* The initial size of the plt reserved for the dynamic linker. */
57 #define PLT_INITIAL_ENTRY_SIZE 72
58 /* The size of the gap between entries in the PLT. */
59 #define PLT_SLOT_SIZE 8
60 /* The number of single-slot PLT entries (the rest use two slots). */
61 #define PLT_NUM_SINGLE_ENTRIES 8192
63 /* Some nop instructions. */
64 #define NOP 0x60000000
65 #define CROR_151515 0x4def7b82
66 #define CROR_313131 0x4ffffb82
68 /* Offset of tp and dtp pointers from start of TLS block. */
69 #define TP_OFFSET 0x7000
70 #define DTP_OFFSET 0x8000
72 \f
73 /* Enumeration to specify the special section. */
74 enum elf_linker_section_enum
75 {
76 LINKER_SECTION_SDATA,
77 LINKER_SECTION_SDATA2
78 };
80 /* Sections created by the linker. */
83 {
84 /* pointer to the section */
86 /* pointer to the relocations needed for this section */
88 /* pointer to the created symbol hash value */
90 /* offset of symbol from beginning of section */
91 bfd_vma sym_offset;
94 /* Linked list of allocated pointer entries. This hangs off of the
95 symbol lists, and provides allows us to return different pointers,
96 based on different addend's. */
99 {
100 /* next allocated pointer for this symbol */
102 /* offset of pointer from beginning of section */
103 bfd_vma offset;
104 /* addend used */
105 bfd_vma addend;
106 /* which linker section this is */
108 /* whether address was written yet */
109 bfd_boolean written_address_p;
112 struct ppc_elf_obj_tdata
113 {
116 /* A mapping from local symbols to offsets into the various linker
117 sections added. This is index by the symbol index. */
119 };
121 #define ppc_elf_tdata(bfd) \
122 ((struct ppc_elf_obj_tdata *) (bfd)->tdata.any)
124 #define elf_local_ptr_offsets(bfd) \
125 (ppc_elf_tdata (bfd)->linker_section_pointers)
127 /* Override the generic function because we store some extras. */
129 static bfd_boolean
131 {
137 }
139 /* The PPC linker needs to keep track of the number of relocs that it
140 decides to copy as dynamic relocs in check_relocs for each symbol.
141 This is so that it can later discard them if they are found to be
142 unnecessary. We store the information in a field extending the
143 regular ELF linker hash table. */
145 struct ppc_elf_dyn_relocs
146 {
149 /* The input section of the reloc. */
152 /* Total number of relocs copied for the input section. */
153 bfd_size_type count;
155 /* Number of pc-relative relocs copied for the input section. */
156 bfd_size_type pc_count;
157 };
159 /* PPC ELF linker hash entry. */
161 struct ppc_elf_link_hash_entry
162 {
165 /* If this symbol is used in the linker created sections, the processor
166 specific backend uses this field to map the field into the offset
167 from the beginning of the section. */
170 /* Track dynamic relocs copied for this symbol. */
173 /* Contexts in which symbol is used in the GOT (or TOC).
174 TLS_GD .. TLS_TLS bits are or'd into the mask as the
175 corresponding relocs are encountered during check_relocs.
176 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to
177 indicate the corresponding GOT entry type is not needed. */
185 };
187 #define ppc_elf_hash_entry(ent) ((struct ppc_elf_link_hash_entry *) (ent))
189 /* PPC ELF linker hash table. */
191 struct ppc_elf_link_hash_table
192 {
195 /* Short-cuts to get to dynamic linker sections. */
208 /* Short-cut to first output tls section. */
211 /* Shortcut to .__tls_get_addr. */
214 /* TLS local dynamic got entry handling. */
216 bfd_signed_vma refcount;
217 bfd_vma offset;
220 /* Small local sym to section mapping cache. */
222 };
224 /* Get the PPC ELF linker hash table from a link_info structure. */
226 #define ppc_elf_hash_table(p) \
227 ((struct ppc_elf_link_hash_table *) (p)->hash)
229 /* Create an entry in a PPC ELF linker hash table. */
235 {
236 /* Allocate the structure if it has not already been allocated by a
237 subclass. */
239 {
244 }
246 /* Call the allocation method of the superclass. */
249 {
253 }
256 }
258 /* Create a PPC ELF linker hash table. */
262 {
270 ppc_elf_link_hash_newfunc))
271 {
274 }
277 }
279 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
280 copying dynamic variables from a shared lib into an app's dynbss
281 section, and instead use a dynamic relocation to point into the
282 shared lib. */
283 #define ELIMINATE_COPY_RELOCS 1
285 /* Copy the extra info we tack onto an elf_link_hash_entry. */
287 static void
291 {
298 {
300 {
307 /* Add reloc counts against the weak sym to the strong sym
308 list. Merge any entries against the same section. */
310 {
315 {
320 }
323 }
325 }
329 }
336 /* If called to transfer flags for a weakdef during processing
337 of elf_adjust_dynamic_symbol, don't copy ELF_LINK_NON_GOT_REF.
338 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
341 | ELF_LINK_HASH_REF_REGULAR
343 else
345 }
346 \f
350 /* This reloc does nothing. */
365 /* A standard 32 bit relocation. */
380 /* An absolute 26 bit branch; the lower two bits must be zero.
381 FIXME: we don't check that, we just clear them. */
396 /* A standard 16 bit relocation. */
411 /* A 16 bit relocation without overflow. */
426 /* The high order 16 bits of an address. */
441 /* The high order 16 bits of an address, plus 1 if the contents of
442 the low 16 bits, treated as a signed number, is negative. */
457 /* An absolute 16 bit branch; the lower two bits must be zero.
458 FIXME: we don't check that, we just clear them. */
473 /* An absolute 16 bit branch, for which bit 10 should be set to
474 indicate that the branch is expected to be taken. The lower two
475 bits must be zero. */
490 /* An absolute 16 bit branch, for which bit 10 should be set to
491 indicate that the branch is not expected to be taken. The lower
492 two bits must be zero. */
507 /* A relative 26 bit branch; the lower two bits must be zero. */
522 /* A relative 16 bit branch; the lower two bits must be zero. */
537 /* A relative 16 bit branch. Bit 10 should be set to indicate that
538 the branch is expected to be taken. The lower two bits must be
539 zero. */
554 /* A relative 16 bit branch. Bit 10 should be set to indicate that
555 the branch is not expected to be taken. The lower two bits must
556 be zero. */
571 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the
572 symbol. */
587 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
588 the symbol. */
603 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
604 the symbol. */
619 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
620 the symbol. */
635 /* Like R_PPC_REL24, but referring to the procedure linkage table
636 entry for the symbol. */
651 /* This is used only by the dynamic linker. The symbol should exist
652 both in the object being run and in some shared library. The
653 dynamic linker copies the data addressed by the symbol from the
654 shared library into the object, because the object being
655 run has to have the data at some particular address. */
670 /* Like R_PPC_ADDR32, but used when setting global offset table
671 entries. */
686 /* Marks a procedure linkage table entry for a symbol. */
701 /* Used only by the dynamic linker. When the object is run, this
702 longword is set to the load address of the object, plus the
703 addend. */
718 /* Like R_PPC_REL24, but uses the value of the symbol within the
719 object rather than the final value. Normally used for
720 _GLOBAL_OFFSET_TABLE_. */
735 /* Like R_PPC_ADDR32, but may be unaligned. */
750 /* Like R_PPC_ADDR16, but may be unaligned. */
765 /* 32-bit PC relative */
780 /* 32-bit relocation to the symbol's procedure linkage table.
781 FIXME: not supported. */
796 /* 32-bit PC relative relocation to the symbol's procedure linkage table.
797 FIXME: not supported. */
812 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
813 the symbol. */
828 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
829 the symbol. */
844 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
845 the symbol. */
860 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
861 small data items. */
876 /* 16-bit section relative relocation. */
891 /* 16-bit lower half section relative relocation. */
906 /* 16-bit upper half section relative relocation. */
921 /* 16-bit upper half adjusted section relative relocation. */
936 /* Marker reloc for TLS. */
951 /* Computes the load module index of the load module that contains the
952 definition of its TLS sym. */
967 /* Computes a dtv-relative displacement, the difference between the value
968 of sym+add and the base address of the thread-local storage block that
969 contains the definition of sym, minus 0x8000. */
984 /* A 16 bit dtprel reloc. */
999 /* Like DTPREL16, but no overflow. */
1014 /* Like DTPREL16_LO, but next higher group of 16 bits. */
1029 /* Like DTPREL16_HI, but adjust for low 16 bits. */
1044 /* Computes a tp-relative displacement, the difference between the value of
1045 sym+add and the value of the thread pointer (r13). */
1060 /* A 16 bit tprel reloc. */
1075 /* Like TPREL16, but no overflow. */
1090 /* Like TPREL16_LO, but next higher group of 16 bits. */
1105 /* Like TPREL16_HI, but adjust for low 16 bits. */
1120 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
1121 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset
1122 to the first entry. */
1137 /* Like GOT_TLSGD16, but no overflow. */
1152 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */
1167 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */
1182 /* Allocates two contiguous entries in the GOT to hold a tls_index structure,
1183 with values (sym+add)@dtpmod and zero, and computes the offset to the
1184 first entry. */
1199 /* Like GOT_TLSLD16, but no overflow. */
1214 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */
1229 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */
1244 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes
1245 the offset to the entry. */
1260 /* Like GOT_DTPREL16, but no overflow. */
1275 /* Like GOT_DTPREL16_LO, but next higher group of 16 bits. */
1290 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */
1305 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the
1306 offset to the entry. */
1321 /* Like GOT_TPREL16, but no overflow. */
1336 /* Like GOT_TPREL16_LO, but next higher group of 16 bits. */
1351 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */
1366 /* The remaining relocs are from the Embedded ELF ABI, and are not
1367 in the SVR4 ELF ABI. */
1369 /* 32 bit value resulting from the addend minus the symbol. */
1384 /* 16 bit value resulting from the addend minus the symbol. */
1399 /* 16 bit value resulting from the addend minus the symbol. */
1414 /* The high order 16 bits of the addend minus the symbol. */
1429 /* The high order 16 bits of the result of the addend minus the address,
1430 plus 1 if the contents of the low 16 bits, treated as a signed number,
1431 is negative. */
1446 /* 16 bit value resulting from allocating a 4 byte word to hold an
1447 address in the .sdata section, and returning the offset from
1448 _SDA_BASE_ for that relocation. */
1463 /* 16 bit value resulting from allocating a 4 byte word to hold an
1464 address in the .sdata2 section, and returning the offset from
1465 _SDA2_BASE_ for that relocation. */
1480 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
1481 small data items. */
1496 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
1497 signed offset from the appropriate base, and filling in the register
1498 field with the appropriate register (0, 2, or 13). */
1513 /* Relocation not handled: R_PPC_EMB_MRKREF */
1514 /* Relocation not handled: R_PPC_EMB_RELSEC16 */
1515 /* Relocation not handled: R_PPC_EMB_RELST_LO */
1516 /* Relocation not handled: R_PPC_EMB_RELST_HI */
1517 /* Relocation not handled: R_PPC_EMB_RELST_HA */
1518 /* Relocation not handled: R_PPC_EMB_BIT_FLD */
1520 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
1521 in the 16 bit signed offset from the appropriate base, and filling in the
1522 register field with the appropriate register (0, 2, or 13). */
1537 /* GNU extension to record C++ vtable hierarchy. */
1552 /* GNU extension to record C++ vtable member usage. */
1567 /* Phony reloc to handle AIX style TOC entries. */
1581 };
1582 \f
1583 /* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
1585 static void
1587 {
1592 i++)
1593 {
1599 }
1600 }
1601 \f
1602 /* This function handles relaxing for the PPC with option --mpc860c0[=<n>].
1604 The MPC860, revision C0 or earlier contains a bug in the die.
1605 If all of the following conditions are true, the next instruction
1606 to be executed *may* be treated as a no-op.
1607 1/ A forward branch is executed.
1608 2/ The branch is predicted as not taken.
1609 3/ The branch is taken.
1610 4/ The branch is located in the last 5 words of a page.
1611 (The EOP limit is 5 by default but may be specified as any value
1612 from 1-10.)
1614 Our software solution is to detect these problematic branches in a
1615 linker pass and modify them as follows:
1616 1/ Unconditional branches - Since these are always predicted taken,
1617 there is no problem and no action is required.
1618 2/ Conditional backward branches - No problem, no action required.
1619 3/ Conditional forward branches - Ensure that the "inverse prediction
1620 bit" is set (ensure it is predicted taken).
1621 4/ Conditional register branches - Ensure that the "y bit" is set
1622 (ensure it is predicted taken). */
1624 /* Sort sections by address. */
1626 static int
1628 {
1632 /* Sort by offset. */
1634 }
1636 static bfd_boolean
1641 {
1642 #define PAGESIZE 0x1000
1651 /* We never have to do this more than once per input section. */
1654 /* If needed, initialize this section's cooked size. */
1658 /* We're only interested in text sections which overlap the
1659 troublesome area at the end of a page. */
1661 {
1663 bfd_boolean section_modified;
1665 /* Get the section contents. */
1666 /* Get cached copy if it exists. */
1669 else
1670 {
1671 /* Go get them off disk. */
1680 }
1685 {
1687 bfd_size_type amt;
1689 /* Get a copy of the native relocations. */
1690 internal_relocs
1698 /* Setup a faster access method for the reloc info we need. */
1705 {
1712 /* Prologue constants are sometimes present in the ".text"
1713 sections and they can be identified by their associated
1714 relocation. We don't want to process those words and
1715 some others which can also be identified by their
1716 relocations. However, not all conditional branches will
1717 have a relocation so we will only ignore words that
1718 1) have a reloc, and 2) the reloc is not applicable to a
1719 conditional branch. The array rela_comb is built here
1720 for use in the EOP scan loop. */
1722 {
1726 /* We should check the instruction. */
1729 /* The word is not a conditional branch - ignore it. */
1732 }
1733 }
1736 ppc_elf_sort_rela);
1737 }
1739 /* Enumerate each EOP region that overlaps this section. */
1744 /* Increment the start position if this section begins in the
1745 middle of its first EOP region. */
1751 {
1752 /* Check each word in this EOP region. */
1754 {
1755 bfd_vma isec_offset;
1759 /* Don't process this word if there is a relocation for it
1760 and the relocation indicates the word is not a
1761 conditional branch. */
1765 {
1766 bfd_vma r_offset;
1770 {
1773 }
1774 }
1777 /* Check the current word for a problematic conditional
1778 branch. */
1779 #define BO0(insn) ((insn) & 0x02000000)
1780 #define BO2(insn) ((insn) & 0x00800000)
1781 #define BO4(insn) ((insn) & 0x00200000)
1785 {
1786 /* Instruction is BCx */
1788 {
1789 bfd_vma target;
1791 /* This branch is predicted as "normal".
1792 If this is a forward branch, it is problematic. */
1796 /* Convert to abs. */
1799 {
1800 /* Set the prediction bit. */
1803 }
1804 }
1805 }
1807 {
1808 /* Instruction is BCCTRx. */
1810 {
1811 /* This branch is predicted as not-taken.
1812 If this is a forward branch, it is problematic.
1813 Since we can't tell statically if it will branch
1814 forward, always set the prediction bit. */
1817 }
1818 }
1820 {
1821 /* Instruction is BCLRx */
1823 {
1824 /* This branch is predicted as not-taken.
1825 If this is a forward branch, it is problematic.
1826 Since we can't tell statically if it will branch
1827 forward, always set the prediction bit. */
1830 }
1831 }
1832 #undef BO0
1833 #undef BO2
1834 #undef BO4
1836 {
1839 }
1840 }
1841 }
1843 {
1846 }
1847 }
1850 {
1853 }
1856 {
1859 }
1862 {
1865 else
1866 {
1867 /* Cache the section contents for elf_link_input_bfd. */
1869 }
1871 }
1875 error_return:
1883 }
1884 \f
1887 bfd_reloc_code_real_type code)
1888 {
1891 /* Initialize howto table if not already done. */
1896 {
1981 }
1984 };
1986 /* Set the howto pointer for a PowerPC ELF reloc. */
1988 static void
1992 {
1993 /* Initialize howto table if not already done. */
1999 }
2001 /* Handle the R_PPC_ADDR16_HA reloc. */
2003 static bfd_reloc_status_type
2011 {
2012 bfd_vma relocation;
2015 {
2018 }
2025 else
2035 }
2037 static bfd_reloc_status_type
2045 {
2046 /* If this is a relocatable link (output_bfd test tells us), just
2047 call the generic function. Any adjustment will be done at final
2048 link time. */
2054 {
2059 }
2061 }
2063 /* Fix bad default arch selected for a 32 bit input bfd when the
2064 default is 64 bit. */
2066 static bfd_boolean
2068 {
2070 {
2074 {
2075 /* Relies on arch after 64 bit default being 32 bit default. */
2078 }
2079 }
2081 }
2083 /* Function to set whether a module needs the -mrelocatable bit set. */
2085 static bfd_boolean
2087 {
2094 }
2096 /* Merge backend specific data from an object file to the output
2097 object file when linking. */
2099 static bfd_boolean
2101 {
2102 flagword old_flags;
2103 flagword new_flags;
2104 bfd_boolean error;
2106 /* Check if we have the same endianess. */
2117 {
2118 /* First call, no flags set. */
2121 }
2123 /* Compatible flags are ok. */
2125 ;
2127 /* Incompatible flags. */
2128 else
2129 {
2130 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib
2131 to be linked with either. */
2135 {
2141 }
2144 {
2150 }
2152 /* The output is -mrelocatable-lib iff both the input files are. */
2156 /* The output is -mrelocatable iff it can't be -mrelocatable-lib,
2157 but each input file is either -mrelocatable or -mrelocatable-lib. */
2163 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if
2164 any module uses it. */
2170 /* Warn about any other mismatches. */
2172 {
2178 }
2181 {
2184 }
2185 }
2188 }
2189 \f
2190 /* Handle a PowerPC specific section when reading an object file. This
2191 is called when elfcode.h finds a section with an unknown type. */
2193 static bfd_boolean
2195 {
2197 flagword flags;
2212 }
2213 \f
2214 /* Set up any other section flags and such that may be necessary. */
2216 static bfd_boolean
2220 {
2228 }
2229 \f
2230 /* Find a linker generated pointer with a given addend and type. */
2233 elf_find_pointer_linker_section
2235 bfd_vma addend,
2237 {
2243 }
2244 \f
2245 /* Allocate a pointer to live in a linker created section. */
2247 static bfd_boolean
2253 {
2257 bfd_size_type amt;
2261 /* Is this a global symbol? */
2263 {
2266 /* Has this symbol already been allocated? If so, our work is done. */
2270 lsect))
2274 /* Make sure this symbol is output as a dynamic symbol. */
2276 {
2279 }
2283 }
2284 else
2285 {
2286 /* Allocation of a pointer to a local symbol. */
2289 /* Allocate a table to hold the local symbols if first time. */
2291 {
2302 }
2304 /* Has this symbol already been allocated? If so, our work is done. */
2307 lsect))
2313 {
2314 /* If we are generating a shared object, we need to
2315 output a R_<xxx>_RELATIVE reloc so that the
2316 dynamic linker can adjust this GOT entry. */
2319 }
2320 }
2322 /* Allocate space for a pointer in the linker section, and allocate
2323 a new pointer record from internal memory. */
2340 #ifdef DEBUG
2345 #endif
2348 }
2349 \f
2350 #define bfd_put_ptr(BFD, VAL, ADDR) bfd_put_32 (BFD, VAL, ADDR)
2352 /* Fill in the address for a pointer generated in a linker section. */
2354 static bfd_vma
2360 bfd_vma relocation,
2363 {
2369 {
2370 /* Handle global symbol. */
2374 linker_section_ptr
2377 lsect);
2385 {
2386 /* This is actually a static link, or it is a
2387 -Bsymbolic link and the symbol is defined
2388 locally. We must initialize this entry in the
2389 global section.
2391 When doing a dynamic link, we create a .rela.<xxx>
2392 relocation entry to initialize the value. This
2393 is done in the finish_dynamic_symbol routine. */
2395 {
2401 }
2402 }
2403 }
2404 else
2405 {
2406 /* Handle local symbol. */
2410 linker_section_ptr = (elf_find_pointer_linker_section
2413 lsect));
2417 /* Write out pointer if it hasn't been rewritten out before. */
2419 {
2425 {
2426 /* We need to generate a relative reloc for the dynamic
2427 linker. */
2438 {
2444 }
2450 }
2451 }
2452 }
2458 #ifdef DEBUG
2462 #endif
2464 /* Subtract out the addend, because it will get added back in by the normal
2465 processing. */
2467 }
2468 \f
2469 /* Create a special linker section */
2474 {
2478 bfd_size_type amt;
2479 flagword flags;
2483 bfd_vma sym_offset;
2485 /* Both of these sections are (technically) created by the user
2486 putting data in them, so they shouldn't be marked
2487 SEC_LINKER_CREATED.
2489 The linker creates them so it has somewhere to attach their
2490 respective symbols. In fact, if they were empty it would
2491 be OK to leave the symbol set to 0 (or any random number), because
2492 the appropriate register should never be used. */
2497 {
2514 }
2516 /* Record the first bfd that needs the special sections. */
2525 /* See if the sections already exist. */
2528 {
2533 }
2542 #ifdef DEBUG
2545 #endif
2548 {
2552 #ifdef DEBUG
2554 #endif
2559 && !(_bfd_generic_link_add_one_symbol
2571 }
2574 {
2583 }
2586 }
2587 \f
2588 /* If we have a non-zero sized .sbss2 or .PPC.EMB.sbss0 sections, we
2589 need to bump up the number of section headers. */
2591 static int
2593 {
2612 }
2614 /* Modify the segment map if needed. */
2616 static bfd_boolean
2618 {
2620 }
2621 \f
2622 /* The powerpc .got has a blrl instruction in it. Mark it executable. */
2624 static bfd_boolean
2626 {
2629 flagword flags;
2654 }
2656 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
2657 to output sections (just like _bfd_elf_create_dynamic_sections has
2658 to create .dynbss and .rela.bss). */
2660 static bfd_boolean
2662 {
2665 flagword flags;
2686 {
2693 }
2702 }
2704 /* Adjust a symbol defined by a dynamic object and referenced by a
2705 regular object. The current definition is in some section of the
2706 dynamic object, but we're not including those sections. We have to
2707 change the definition to something the rest of the link can
2708 understand. */
2710 static bfd_boolean
2713 {
2718 #ifdef DEBUG
2721 #endif
2723 /* Make sure we know what is going on here. */
2735 /* Deal with function syms. */
2738 {
2739 /* Clear procedure linkage table information for any symbol that
2740 won't need a .plt entry. */
2745 {
2746 /* A PLT entry is not required/allowed when:
2748 1. We are not using ld.so; because then the PLT entry
2749 can't be set up, so we can't use one. In this case,
2750 ppc_elf_adjust_dynamic_symbol won't even be called.
2752 2. GC has rendered the entry unused.
2754 3. We know for certain that a call to this symbol
2755 will go to this object, or will remain undefined. */
2758 }
2760 }
2761 else
2764 /* If this is a weak symbol, and there is a real definition, the
2765 processor independent code will have arranged for us to see the
2766 real definition first, and we can just use the same value. */
2768 {
2774 h->elf_link_hash_flags
2778 }
2780 /* This is a reference to a symbol defined by a dynamic object which
2781 is not a function. */
2783 /* If we are creating a shared library, we must presume that the
2784 only references to the symbol are via the global offset table.
2785 For such cases we need not do anything here; the relocations will
2786 be handled correctly by relocate_section. */
2790 /* If there are no references to this symbol that do not use the
2791 GOT, we don't need to generate a copy reloc. */
2796 {
2799 {
2803 }
2805 /* If we didn't find any dynamic relocs in read-only sections, then
2806 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2808 {
2811 }
2812 }
2814 /* We must allocate the symbol in our .dynbss section, which will
2815 become part of the .bss section of the executable. There will be
2816 an entry for this symbol in the .dynsym section. The dynamic
2817 object will contain position independent code, so all references
2818 from the dynamic object to this symbol will go through the global
2819 offset table. The dynamic linker will use the .dynsym entry to
2820 determine the address it must put in the global offset table, so
2821 both the dynamic object and the regular object will refer to the
2822 same memory location for the variable.
2824 Of course, if the symbol is sufficiently small, we must instead
2825 allocate it in .sbss. FIXME: It would be better to do this if and
2826 only if there were actually SDAREL relocs for that symbol. */
2830 else
2834 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to
2835 copy the initial value out of the dynamic object and into the
2836 runtime process image. We need to remember the offset into the
2837 .rela.bss section we are going to use. */
2839 {
2844 else
2849 }
2851 /* We need to figure out the alignment required for this symbol. I
2852 have no idea how ELF linkers handle this. */
2857 /* Apply the required alignment. */
2861 {
2864 }
2866 /* Define the symbol as being at this point in the section. */
2870 /* Increment the section size to make room for the symbol. */
2874 }
2875 \f
2876 /* This is the condition under which finish_dynamic_symbol will be
2877 called from elflink.h. If elflink.h doesn't call our
2878 finish_dynamic_symbol routine, we'll need to do something about
2879 initializing any .plt and .got entries in relocate_section. */
2880 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
2881 ((DYN) \
2882 && ((SHARED) \
2883 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
2884 && ((H)->dynindx != -1 \
2885 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
2887 /* Of those relocs that might be copied as dynamic relocs, this macro
2888 selects those that must be copied when linking a shared library,
2889 even when the symbol is local. */
2891 #define MUST_BE_DYN_RELOC(RTYPE) \
2892 ((RTYPE) != R_PPC_REL24 \
2893 && (RTYPE) != R_PPC_REL14 \
2894 && (RTYPE) != R_PPC_REL14_BRTAKEN \
2895 && (RTYPE) != R_PPC_REL14_BRNTAKEN \
2896 && (RTYPE) != R_PPC_REL32)
2898 /* Allocate space in associated reloc sections for dynamic relocs. */
2900 static bfd_boolean
2902 {
2912 /* When warning symbols are created, they **replace** the "real"
2913 entry in the hash table, thus we never get to see the real
2914 symbol in a hash traversal. So look at it now. */
2920 {
2921 /* Make sure this symbol is output as a dynamic symbol. */
2924 {
2927 }
2931 {
2934 /* If this is the first .plt entry, make room for the special
2935 first entry. */
2939 /* The PowerPC PLT is actually composed of two parts, the
2940 first part is 2 words (for a load and a jump), and then
2941 there is a remaining word available at the end. */
2943 + (PLT_SLOT_SIZE
2947 /* If this symbol is not defined in a regular file, and we
2948 are not generating a shared library, then set the symbol
2949 to this location in the .plt. This is required to make
2950 function pointers compare as equal between the normal
2951 executable and the shared library. */
2954 {
2957 }
2959 /* Make room for this entry. After the 8192nd entry, room
2960 for two entries is allocated. */
2966 /* We also need to make an entry in the .rela.plt section. */
2968 }
2969 else
2970 {
2973 }
2974 }
2975 else
2976 {
2979 }
2983 {
2984 /* Make sure this symbol is output as a dynamic symbol. */
2987 {
2990 }
2994 /* If just an LD reloc, we'll just use htab->tlsld_got.offset. */
2996 else
2997 {
2998 bfd_boolean dyn;
3001 {
3010 }
3011 else
3018 {
3019 /* All the entries we allocated need relocs. */
3023 /* Except LD only needs one. */
3026 }
3027 }
3028 }
3029 else
3035 /* In the shared -Bsymbolic case, discard space allocated for
3036 dynamic pc-relative relocs against symbols which turn out to be
3037 defined in regular objects. For the normal shared case, discard
3038 space for relocs that have become local due to symbol visibility
3039 changes. */
3042 {
3043 /* Relocs that use pc_count are those that appear on a call insn,
3044 or certain REL relocs (see MUST_BE_DYN_RELOC) that can be
3045 generated via assembly. We want calls to protected symbols to
3046 resolve directly to the function rather than going via the plt.
3047 If people want function pointer comparisons to work as expected
3048 then they should avoid writing weird assembly. */
3050 {
3054 {
3059 else
3061 }
3062 }
3064 /* Also discard relocs on undefined weak syms with non-default
3065 visibility. */
3069 }
3071 {
3072 /* For the non-shared case, discard space for relocs against
3073 symbols which turn out to need copy relocs or are not
3074 dynamic. */
3079 {
3080 /* Make sure this symbol is output as a dynamic symbol.
3081 Undefined weak syms won't yet be marked as dynamic. */
3084 {
3087 }
3089 /* If that succeeded, we know we'll be keeping all the
3090 relocs. */
3093 }
3097 keep: ;
3098 }
3100 /* Finally, allocate space. */
3102 {
3105 }
3108 }
3110 /* Find any dynamic relocs that apply to read-only sections. */
3112 static bfd_boolean
3114 {
3124 {
3130 {
3133 /* Not an error, just cut short the traversal. */
3135 }
3136 }
3138 }
3140 /* Set the sizes of the dynamic sections. */
3142 static bfd_boolean
3145 {
3148 bfd_boolean relocs;
3151 #ifdef DEBUG
3153 #endif
3159 {
3160 /* Set the contents of the .interp section to the interpreter. */
3162 {
3167 }
3168 }
3171 {
3176 }
3177 else
3180 /* Set up .got offsets for local syms, and space for local dynamic
3181 relocs. */
3183 {
3187 bfd_size_type locsymcount;
3195 {
3202 {
3205 {
3206 /* Input section has been discarded, either because
3207 it is a copy of a linkonce section or due to
3208 linker script /DISCARD/, so we'll be discarding
3209 the relocs too. */
3210 }
3212 {
3219 }
3220 }
3221 }
3235 {
3237 {
3238 /* If just an LD reloc, we'll just use
3239 htab->tlsld_got.offset. */
3241 {
3246 }
3248 }
3249 else
3250 {
3253 {
3260 }
3261 else
3266 }
3267 }
3268 else
3270 }
3272 /* Allocate space for global sym dynamic relocs. */
3275 /* We've now determined the sizes of the various dynamic sections.
3276 Allocate memory for them. */
3279 {
3287 {
3288 /* Strip this section if we don't need it; see the
3289 comment below. */
3290 }
3292 {
3294 {
3295 /* If we don't need this section, strip it from the
3296 output file. This is mostly to handle .rela.bss and
3297 .rela.plt. We must create both sections in
3298 create_dynamic_sections, because they must be created
3299 before the linker maps input sections to output
3300 sections. The linker does that before
3301 adjust_dynamic_symbol is called, and it is that
3302 function which decides whether anything needs to go
3303 into these sections. */
3304 }
3305 else
3306 {
3307 /* Remember whether there are any relocation sections. */
3310 /* We use the reloc_count field as a counter if we need
3311 to copy relocs into the output file. */
3313 }
3314 }
3315 else
3316 {
3317 /* It's not one of our sections, so don't allocate space. */
3319 }
3322 {
3325 }
3327 /* Allocate memory for the section contents. */
3331 }
3334 {
3335 /* Add some entries to the .dynamic section. We fill in the
3336 values later, in ppc_elf_finish_dynamic_sections, but we
3337 must add the entries now so that we get the correct size for
3338 the .dynamic section. The DT_DEBUG entry is filled in by the
3339 dynamic linker and used by the debugger. */
3340 #define add_dynamic_entry(TAG, VAL) \
3341 bfd_elf32_add_dynamic_entry (info, (TAG), (VAL))
3344 {
3347 }
3350 {
3356 }
3359 {
3364 }
3366 /* If any dynamic relocs apply to a read-only section, then we
3367 need a DT_TEXTREL entry. */
3370 info);
3373 {
3376 }
3377 }
3378 #undef add_dynamic_entry
3381 }
3382 \f
3383 static bfd_boolean
3388 {
3393 {
3401 }
3407 }
3409 static void
3411 {
3417 }
3419 /* Look through the relocs for a section during the first phase, and
3420 allocate space in the global offset table or procedure linkage
3421 table. */
3423 static bfd_boolean
3428 {
3439 #ifdef DEBUG
3443 #endif
3445 /* Initialize howto table if not already done. */
3449 /* Create the linker generated sections all the time so that the
3450 special symbols are created. */
3453 {
3455 LINKER_SECTION_SDATA);
3458 }
3461 {
3463 LINKER_SECTION_SDATA2);
3466 }
3474 {
3483 else
3486 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
3487 This shows up in particular in an R_PPC_ADDR32 in the eabi
3488 startup code. */
3490 {
3492 {
3497 }
3498 }
3502 {
3532 dogottls:
3534 /* Fall thru */
3536 /* GOT16 relocations */
3541 /* This symbol requires a global offset table entry. */
3543 {
3548 }
3550 {
3553 }
3554 else
3555 /* This is a global offset table entry for a local symbol. */
3560 /* Indirect .sdata relocation. */
3563 {
3566 }
3572 /* Indirect .sdata2 relocation. */
3575 {
3578 }
3594 {
3597 }
3606 #ifdef DEBUG
3608 #endif
3609 /* This symbol requires a procedure linkage table entry. We
3610 actually build the entry in finish_dynamic_symbol,
3611 because this might be a case of linking PIC code without
3612 linking in any dynamic objects, in which case we don't
3613 need to generate a procedure linkage table after all. */
3616 {
3617 /* It does not make sense to have a procedure linkage
3618 table entry for a local symbol. */
3627 }
3633 /* The following relocations don't need to propagate the
3634 relocation if linking a shared object since they are
3635 section relative. */
3647 /* This are just markers. */
3654 /* These should only appear in dynamic objects. */
3661 /* These aren't handled yet. We'll report an error later. */
3670 /* This refers only to functions defined in the shared library. */
3674 /* This relocation describes the C++ object vtable hierarchy.
3675 Reconstruct it for later use during GC. */
3681 /* This relocation describes which C++ vtable entries are actually
3682 used. Record for later use during GC. */
3688 /* We shouldn't really be seeing these. */
3694 /* Nor these. */
3707 /* When creating a shared object, we must copy these
3708 relocs into the output file. We create a reloc
3709 section in dynobj and make room for the reloc. */
3718 /* fall through */
3732 {
3733 /* We may need a plt entry if the symbol turns out to be
3734 a function defined in a dynamic object. */
3737 /* We may need a copy reloc too. */
3739 }
3741 dodyn:
3742 /* If we are creating a shared library, and this is a reloc
3743 against a global symbol, or a non PC relative reloc
3744 against a local symbol, then we need to copy the reloc
3745 into the shared library. However, if we are linking with
3746 -Bsymbolic, we do not need to copy a reloc against a
3747 global symbol which is defined in an object we are
3748 including in the link (i.e., DEF_REGULAR is set). At
3749 this point we have not seen all the input files, so it is
3750 possible that DEF_REGULAR is not set now but will be set
3751 later (it is never cleared). In case of a weak definition,
3752 DEF_REGULAR may be cleared later by a strong definition in
3753 a shared library. We account for that possibility below by
3754 storing information in the dyn_relocs field of the hash
3755 table entry. A similar situation occurs when creating
3756 shared libraries and symbol visibility changes render the
3757 symbol local.
3759 If on the other hand, we are creating an executable, we
3760 may need to keep relocations for symbols satisfied by a
3761 dynamic library if we manage to avoid copy relocs for the
3762 symbol. */
3770 || (ELIMINATE_COPY_RELOCS
3777 {
3781 #ifdef DEBUG
3783 "ppc_elf_check_relocs needs to "
3787 #endif
3789 {
3792 name = (bfd_elf_string_from_elf_section
3805 {
3806 flagword flags;
3819 }
3821 }
3823 /* If this is a global symbol, we count the number of
3824 relocations we need for this symbol. */
3826 {
3828 }
3829 else
3830 {
3831 /* Track dynamic relocs needed for local syms too.
3832 We really need local syms available to do this
3833 easily. Oh well. */
3843 }
3847 {
3856 }
3861 }
3864 }
3865 }
3868 }
3870 /* Return the section that should be marked against GC for a given
3871 relocation. */
3879 {
3881 {
3883 {
3890 {
3900 }
3901 }
3902 }
3903 else
3907 }
3909 /* Update the got, plt and dynamic reloc reference counts for the
3910 section being removed. */
3912 static bfd_boolean
3917 {
3933 {
3940 {
3949 {
3950 /* Everything must go for SEC. */
3953 }
3954 }
3958 {
3964 /* Fall thru */
3983 {
3986 }
3988 {
3991 }
4002 /* Fall thru */
4021 {
4024 }
4029 }
4030 }
4032 }
4034 /* Set htab->tls_sec and htab->tls_get_addr. */
4036 bfd_boolean
4038 {
4053 }
4055 /* Run through all the TLS relocs looking for optimization
4056 opportunities. */
4058 bfd_boolean
4061 {
4071 {
4077 {
4081 /* Read the relocations. */
4090 {
4096 bfd_boolean is_local;
4100 {
4108 }
4117 {
4122 /* These relocs should never be against a symbol
4123 defined in a shared lib. Leave them alone if
4124 that turns out to be the case. */
4130 /* LD -> LE */
4141 /* GD -> LE */
4143 else
4144 /* GD -> IE */
4156 {
4157 /* IE -> LE */
4161 }
4162 else
4172 {
4175 }
4182 }
4185 {
4187 {
4188 /* We managed to get rid of a got entry. */
4191 }
4193 }
4194 else
4195 {
4201 {
4208 {
4212 }
4213 }
4219 {
4220 /* We managed to get rid of a got entry. */
4223 }
4226 }
4230 }
4234 }
4238 {
4241 else
4243 }
4244 }
4246 }
4247 \f
4248 /* Hook called by the linker routine which adds symbols from an object
4249 file. We use it to put .comm items in .sbss, and not .bss. */
4251 static bfd_boolean
4259 {
4265 {
4266 /* Common symbols less than or equal to -G nn bytes are automatically
4267 put into .sbss. */
4272 {
4279 }
4283 }
4286 }
4287 \f
4288 /* Finish up dynamic symbol handling. We set the contents of various
4289 dynamic sections here. */
4291 static bfd_boolean
4296 {
4299 #ifdef DEBUG
4302 #endif
4308 {
4309 Elf_Internal_Rela rela;
4311 bfd_vma reloc_index;
4313 #ifdef DEBUG
4315 #endif
4317 /* This symbol has an entry in the procedure linkage table. Set
4318 it up. */
4323 /* We don't need to fill in the .plt. The ppc dynamic linker
4324 will fill it in. */
4326 /* Fill in the entry in the .rela.plt section. */
4341 {
4342 /* Mark the symbol as undefined, rather than as defined in
4343 the .plt section. Leave the value alone. */
4345 /* If the symbol is weak, we do need to clear the value.
4346 Otherwise, the PLT entry would provide a definition for
4347 the symbol even if the symbol wasn't defined anywhere,
4348 and so the symbol would never be NULL. */
4352 }
4353 }
4356 {
4358 Elf_Internal_Rela rela;
4361 /* This symbols needs a copy reloc. Set it up. */
4363 #ifdef DEBUG
4365 #endif
4371 else
4382 }
4384 #ifdef DEBUG
4386 #endif
4388 /* Mark some specially defined symbols as absolute. */
4395 }
4396 \f
4397 /* Finish up the dynamic sections. */
4399 static bfd_boolean
4402 {
4406 #ifdef DEBUG
4408 #endif
4414 {
4422 {
4423 Elf_Internal_Dyn dyn;
4429 {
4446 }
4449 }
4450 }
4452 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
4453 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
4455 {
4461 else
4467 }
4470 }
4471 \f
4472 /* The RELOCATE_SECTION function is called by the ELF backend linker
4473 to handle the relocations for a section.
4475 The relocs are always passed as Rela structures; if the section
4476 actually uses Rel structures, the r_addend field will always be
4477 zero.
4479 This function is responsible for adjust the section contents as
4480 necessary, and (if using Rela relocs and generating a
4481 relocatable output file) adjusting the reloc addend as
4482 necessary.
4484 This function does not have to worry about setting the reloc
4485 address or the reloc symbol index.
4487 LOCAL_SYMS is a pointer to the swapped in local symbols.
4489 LOCAL_SECTIONS is an array giving the section in the input file
4490 corresponding to the st_shndx field of each local symbol.
4492 The global hash table entry for the global symbols can be found
4493 via elf_sym_hashes (input_bfd).
4495 When generating relocatable output, this function must handle
4496 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
4497 going to be the section symbol corresponding to the output
4498 section, which means that the addend must be adjusted
4499 accordingly. */
4501 static bfd_boolean
4510 {
4516 Elf_Internal_Rela outrel;
4522 #ifdef DEBUG
4529 #endif
4534 /* Initialize howto table if not already done. */
4545 {
4547 bfd_vma addend;
4548 bfd_reloc_status_type r;
4555 bfd_vma relocation;
4557 bfd_boolean unresolved_reloc;
4558 bfd_boolean warned;
4569 {
4575 }
4576 else
4577 {
4587 {
4589 /* Set a flag that will be cleared later if we find a
4590 relocation value for this symbol. output_section
4591 is typically NULL for symbols satisfied by a shared
4592 library. */
4595 else
4599 }
4601 ;
4605 ;
4606 else
4607 {
4615 }
4616 }
4618 /* TLS optimizations. Replace instruction sequences and relocs
4619 based on information we collected in tls_optimize. We edit
4620 RELOCS so that --emit-relocs will output something sensible
4621 for the final instruction stream. */
4625 {
4629 {
4633 }
4634 }
4636 /* Ensure reloc mapping code below stays sane. */
4647 {
4655 {
4656 bfd_vma insn;
4663 }
4669 {
4678 else
4681 /* add -> addi. */
4687 /* load and store indexed -> dform. */
4691 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */
4696 /* lwax -> lwa. */
4698 else
4704 /* Was PPC_TLS which sits on insn boundary, now
4705 PPC_TPREL16_LO which is at insn+2. */
4707 }
4720 {
4721 tls_gdld_hi:
4725 else
4726 {
4730 }
4732 }
4745 {
4746 tls_get_addr_check:
4748 {
4753 bfd_vma offset;
4755 /* The next instruction should be a call to
4756 __tls_get_addr. Peek at the reloc to be sure. */
4774 /* OK, it checks out. Replace the call. */
4779 {
4780 /* IE */
4788 }
4789 else
4790 {
4791 /* LE */
4795 {
4796 /* Was an LD reloc. */
4800 }
4804 R_PPC_TPREL16_LO);
4806 }
4810 {
4811 /* We changed the symbol on an LD reloc. Start over
4812 in order to get h, sym, sec etc. right. */
4813 rel--;
4815 }
4816 }
4817 }
4819 }
4821 /* Handle other relocations that tweak non-addend part of insn. */
4824 {
4828 /* Branch taken prediction relocations. */
4832 /* Fall thru */
4834 /* Branch not taken predicition relocations. */
4845 /* Invert 'y' bit if not the default. */
4851 }
4859 {
4876 /* GOT16 relocations. Like an ADDR16 using the symbol's
4877 address in the GOT as relocation value instead of the
4878 symbol's value itself. Also, create a GOT entry for the
4879 symbol and put the symbol value there. */
4912 dogot:
4913 {
4914 /* Relocation is to the entry for this symbol in the global
4915 offset table. */
4916 bfd_vma off;
4929 {
4930 bfd_boolean dyn;
4935 /* This is actually a static link, or it is a
4936 -Bsymbolic link and the symbol is defined
4937 locally, or the symbol was forced to be local
4938 because of a version file. */
4939 ;
4940 else
4941 {
4944 }
4946 }
4947 else
4948 {
4952 }
4954 /* The offset must always be a multiple of 4. We use the
4955 least significant bit to record whether we have already
4956 processed this entry. */
4960 else
4961 {
4973 /* We might have multiple got entries for this sym.
4974 Initialize them all. */
4975 do
4976 {
4980 {
4983 }
4985 {
4988 }
4990 {
4993 }
4995 {
4998 }
5000 /* Generate relocs for the dynamic linker. */
5005 {
5011 {
5014 {
5021 outrel.r_info
5023 }
5024 }
5031 else
5034 {
5038 }
5043 }
5045 /* Init the .got section contents if we're not
5046 emitting a reloc. */
5047 else
5048 {
5054 {
5060 {
5064 }
5065 }
5068 }
5073 }
5078 }
5084 {
5086 {
5093 {
5097 {
5100 }
5101 }
5102 }
5103 }
5107 /* Addends on got relocations don't make much sense.
5108 x+off@got is actually x@got+off, and since the got is
5109 generated by a hash table traversal, the value in the
5110 got at entry m+n bears little relation to the entry m. */
5118 sym_name);
5119 }
5122 /* Relocations that need no special processing. */
5124 /* It makes no sense to point a local relocation
5125 at a symbol not in this object. */
5127 {
5130 input_bfd,
5131 input_section,
5133 TRUE))
5136 }
5146 /* Relocations that may need to be propagated if this is a shared
5147 object. */
5153 /* The TPREL16 relocs shouldn't really be used in shared
5154 libs as they will result in DT_TEXTREL being set, but
5155 support them anyway. */
5176 /* If these relocations are not to a named symbol, they can be
5177 handled right here, no need to bother the dynamic linker. */
5182 /* fall through */
5184 /* Relocations that always need to be propagated if this is a shared
5185 object. */
5197 /* r_symndx will be zero only for relocs against symbols
5198 from removed linkonce sections, or sections discarded by
5199 a linker script. */
5200 dodyn:
5203 /* Fall thru. */
5212 || (ELIMINATE_COPY_RELOCS
5220 {
5223 #ifdef DEBUG
5228 #endif
5230 /* When generating a shared object, these relocations
5231 are copied into the output file to be resolved at run
5232 time. */
5234 {
5237 name = (bfd_elf_string_from_elf_section
5246 input_section),
5251 }
5268 {
5272 }
5273 else
5274 {
5279 else
5280 {
5286 {
5289 }
5290 else
5291 {
5294 /* We are turning this relocation into one
5295 against a section symbol. It would be
5296 proper to subtract the symbol's value,
5297 osec->vma, from the emitted reloc addend,
5298 but ld.so expects buggy relocs. */
5302 #ifdef DEBUG
5307 #endif
5308 }
5311 }
5312 }
5321 /* This reloc will be computed at runtime. We clear the memory
5322 so that it contains predictable value. */
5326 {
5330 }
5331 }
5334 /* Indirect .sdata relocation. */
5337 relocation
5343 /* Indirect .sdata2 relocation. */
5346 relocation
5352 /* Handle the TOC16 reloc. We want to use the offset within the .got
5353 section, not the actual VMA. This is appropriate when generating
5354 an embedded ELF object, for which the .got section acts like the
5355 AIX .toc section. */
5366 /* Relocation is to the entry for this symbol in the
5367 procedure linkage table. */
5372 {
5373 /* We didn't make a PLT entry for this symbol. This
5374 happens when statically linking PIC code, or when
5375 using -Bsymbolic. */
5377 }
5385 /* Relocate against _SDA_BASE_. */
5387 {
5397 {
5402 sym_name,
5404 name);
5405 }
5410 }
5413 /* Relocate against _SDA2_BASE_. */
5415 {
5423 {
5428 sym_name,
5430 name);
5435 }
5440 }
5443 /* Relocate against either _SDA_BASE_, _SDA2_BASE_, or 0. */
5446 {
5457 {
5463 }
5467 {
5473 }
5477 {
5479 }
5481 else
5482 {
5487 sym_name,
5489 name);
5494 }
5501 }
5502 }
5505 /* Relocate against the beginning of the section. */
5514 /* Negative relocations. */
5542 sym_name);
5547 }
5549 /* Do any further special processing. */
5551 {
5567 /* It's just possible that this symbol is a weak symbol
5568 that's not actually defined anywhere. In that case,
5569 'sec' would be NULL, and we should leave the symbol
5570 alone (it will be set to zero elsewhere in the link). */
5572 /* Add 0x10000 if sign bit in 0:15 is set.
5573 Bits 0:15 are not used. */
5576 }
5578 #ifdef DEBUG
5583 sym_name,
5584 r_symndx,
5587 #endif
5592 {
5599 sym_name);
5601 }
5604 input_bfd,
5605 input_section,
5606 contents,
5608 relocation,
5609 addend);
5612 {
5616 {
5622 {
5623 /* Assume this is a call protected by other code that
5624 detect the symbol is undefined. If this is the case,
5625 we can safely ignore the overflow. If not, the
5626 program is hosed anyway, and a little warning isn't
5627 going to help. */
5630 }
5633 sym_name,
5636 input_bfd,
5637 input_section,
5640 }
5641 else
5642 {
5649 }
5650 }
5651 }
5653 #ifdef DEBUG
5655 #endif
5658 }
5660 static enum elf_reloc_type_class
5662 {
5664 {
5675 }
5676 }
5677 \f
5678 /* Support for core dump NOTE sections. */
5680 static bfd_boolean
5682 {
5687 {
5692 /* pr_cursig */
5695 /* pr_pid */
5698 /* pr_reg */
5703 }
5705 /* Make a ".reg/999" section. */
5708 }
5710 static bfd_boolean
5712 {
5714 {
5723 }
5725 /* Note that for some reason, a spurious space is tacked
5726 onto the end of the args in some (at least one anyway)
5727 implementations, so strip it off if it exists. */
5729 {
5735 }
5738 }
5739 \f
5740 /* Very simple linked list structure for recording apuinfo values. */
5742 {
5745 }
5746 apuinfo_list;
5751 static void
5753 {
5755 }
5757 static void
5759 {
5763 {
5767 }
5776 }
5778 static unsigned
5780 {
5785 entry;
5790 }
5794 {
5800 ;
5803 }
5805 static void
5807 {
5811 {
5815 }
5818 }
5823 /* Scan the input BFDs and create a linked list of
5824 the APUinfo values that will need to be emitted. */
5826 static void
5828 {
5833 bfd_size_type output_section_size;
5843 /* Scan the input bfds, looking for apuinfo sections. */
5848 {
5851 {
5854 }
5855 }
5857 /* We need at least one input sections
5858 in order to make merging worthwhile. */
5862 /* Just make sure that the output section exists as well. */
5867 /* Allocate a buffer for the contents of the input sections. */
5875 /* Read in the input sections contents. */
5877 {
5887 {
5890 }
5894 {
5897 }
5899 /* Process the contents of the section. */
5903 /* Verify the contents of the header. Note - we have to
5904 extract the values this way in order to allow for a
5905 host whose endian-ness is different from the target. */
5917 /* Get the number of bytes used for apuinfo entries. */
5922 /* Make sure that we do not run off the end of the section. */
5926 /* Scan the apuinfo section, building a list of apuinfo numbers. */
5930 /* Update the offset. */
5932 }
5936 /* Compute the size of the output section. */
5946 fail:
5952 }
5955 /* Prevent the output section from accumulating the input sections'
5956 contents. We have already stored this in our linked list structure. */
5958 static bfd_boolean
5962 {
5965 }
5968 /* Finally we can generate the output section. */
5970 static void
5972 {
5977 bfd_size_type length;
5992 {
5996 }
5998 /* Create the apuinfo header. */
6007 {
6010 }
6021 }
6022 \f
6023 #define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
6025 #define TARGET_BIG_SYM bfd_elf32_powerpc_vec
6027 #define ELF_ARCH bfd_arch_powerpc
6028 #define ELF_MACHINE_CODE EM_PPC
6029 #ifdef __QNXTARGET__
6030 #define ELF_MAXPAGESIZE 0x1000
6031 #else
6032 #define ELF_MAXPAGESIZE 0x10000
6033 #endif
6034 #define elf_info_to_howto ppc_elf_info_to_howto
6036 #ifdef EM_CYGNUS_POWERPC
6037 #define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
6038 #endif
6040 #ifdef EM_PPC_OLD
6041 #define ELF_MACHINE_ALT2 EM_PPC_OLD
6042 #endif
6044 #define elf_backend_plt_not_loaded 1
6045 #define elf_backend_got_symbol_offset 4
6046 #define elf_backend_can_gc_sections 1
6047 #define elf_backend_can_refcount 1
6048 #define elf_backend_got_header_size 12
6049 #define elf_backend_plt_header_size PLT_INITIAL_ENTRY_SIZE
6050 #define elf_backend_rela_normal 1
6052 #define bfd_elf32_mkobject ppc_elf_mkobject
6053 #define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
6054 #define bfd_elf32_bfd_relax_section ppc_elf_relax_section
6055 #define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
6056 #define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
6057 #define bfd_elf32_bfd_link_hash_table_create ppc_elf_link_hash_table_create
6059 #define elf_backend_object_p ppc_elf_object_p
6060 #define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook
6061 #define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook
6062 #define elf_backend_section_from_shdr ppc_elf_section_from_shdr
6063 #define elf_backend_relocate_section ppc_elf_relocate_section
6064 #define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections
6065 #define elf_backend_check_relocs ppc_elf_check_relocs
6066 #define elf_backend_copy_indirect_symbol ppc_elf_copy_indirect_symbol
6067 #define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
6068 #define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
6069 #define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
6070 #define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
6071 #define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
6072 #define elf_backend_fake_sections ppc_elf_fake_sections
6073 #define elf_backend_additional_program_headers ppc_elf_additional_program_headers
6074 #define elf_backend_modify_segment_map ppc_elf_modify_segment_map
6075 #define elf_backend_grok_prstatus ppc_elf_grok_prstatus
6076 #define elf_backend_grok_psinfo ppc_elf_grok_psinfo
6077 #define elf_backend_reloc_type_class ppc_elf_reloc_type_class
6078 #define elf_backend_begin_write_processing ppc_elf_begin_write_processing
6079 #define elf_backend_final_write_processing ppc_elf_final_write_processing
6080 #define elf_backend_write_section ppc_elf_write_section