1 /* SPARC-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
26 static reloc_howto_type
*bfd_elf32_bfd_reloc_type_lookup
27 PARAMS ((bfd
*, bfd_reloc_code_real_type
));
28 static void elf_info_to_howto
29 PARAMS ((bfd
*, arelent
*, Elf_Internal_Rela
*));
30 static boolean elf32_sparc_check_relocs
31 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
32 const Elf_Internal_Rela
*));
33 static boolean elf32_sparc_adjust_dynamic_symbol
34 PARAMS ((struct bfd_link_info
*, struct elf_link_hash_entry
*));
35 static boolean elf32_sparc_adjust_dynindx
36 PARAMS ((struct elf_link_hash_entry
*, PTR
));
37 static boolean elf32_sparc_size_dynamic_sections
38 PARAMS ((bfd
*, struct bfd_link_info
*));
39 static boolean elf32_sparc_relocate_section
40 PARAMS ((bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
41 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**));
42 static boolean elf32_sparc_finish_dynamic_symbol
43 PARAMS ((bfd
*, struct bfd_link_info
*, struct elf_link_hash_entry
*,
45 static boolean elf32_sparc_finish_dynamic_sections
46 PARAMS ((bfd
*, struct bfd_link_info
*));
51 R_SPARC_8
, R_SPARC_16
, R_SPARC_32
,
52 R_SPARC_DISP8
, R_SPARC_DISP16
, R_SPARC_DISP32
,
53 R_SPARC_WDISP30
, R_SPARC_WDISP22
,
54 R_SPARC_HI22
, R_SPARC_22
,
55 R_SPARC_13
, R_SPARC_LO10
,
56 R_SPARC_GOT10
, R_SPARC_GOT13
, R_SPARC_GOT22
,
57 R_SPARC_PC10
, R_SPARC_PC22
,
60 R_SPARC_GLOB_DAT
, R_SPARC_JMP_SLOT
,
67 static CONST
char *CONST reloc_type_names
[] =
70 "R_SPARC_8", "R_SPARC_16", "R_SPARC_32",
71 "R_SPARC_DISP8", "R_SPARC_DISP16", "R_SPARC_DISP32",
72 "R_SPARC_WDISP30", "R_SPARC_WDISP22",
73 "R_SPARC_HI22", "R_SPARC_22",
74 "R_SPARC_13", "R_SPARC_LO10",
75 "R_SPARC_GOT10", "R_SPARC_GOT13", "R_SPARC_GOT22",
76 "R_SPARC_PC10", "R_SPARC_PC22",
79 "R_SPARC_GLOB_DAT", "R_SPARC_JMP_SLOT",
85 static reloc_howto_type elf_sparc_howto_table
[] =
87 HOWTO(R_SPARC_NONE
, 0,0, 0,false,0,complain_overflow_dont
, bfd_elf_generic_reloc
,"R_SPARC_NONE", false,0,0x00000000,true),
88 HOWTO(R_SPARC_8
, 0,0, 8,false,0,complain_overflow_bitfield
,bfd_elf_generic_reloc
,"R_SPARC_8", false,0,0x000000ff,true),
89 HOWTO(R_SPARC_16
, 0,1,16,false,0,complain_overflow_bitfield
,bfd_elf_generic_reloc
,"R_SPARC_16", false,0,0x0000ffff,true),
90 HOWTO(R_SPARC_32
, 0,2,32,false,0,complain_overflow_bitfield
,bfd_elf_generic_reloc
,"R_SPARC_32", false,0,0xffffffff,true),
91 HOWTO(R_SPARC_DISP8
, 0,0, 8,true, 0,complain_overflow_signed
, bfd_elf_generic_reloc
,"R_SPARC_DISP8", false,0,0x000000ff,true),
92 HOWTO(R_SPARC_DISP16
, 0,1,16,true, 0,complain_overflow_signed
, bfd_elf_generic_reloc
,"R_SPARC_DISP16", false,0,0x0000ffff,true),
93 HOWTO(R_SPARC_DISP32
, 0,2,32,true, 0,complain_overflow_signed
, bfd_elf_generic_reloc
,"R_SPARC_DISP32", false,0,0x00ffffff,true),
94 HOWTO(R_SPARC_WDISP30
, 2,2,30,true, 0,complain_overflow_signed
, bfd_elf_generic_reloc
,"R_SPARC_WDISP30", false,0,0x3fffffff,true),
95 HOWTO(R_SPARC_WDISP22
, 2,2,22,true, 0,complain_overflow_signed
, bfd_elf_generic_reloc
,"R_SPARC_WDISP22", false,0,0x003fffff,true),
96 HOWTO(R_SPARC_HI22
, 10,2,22,false,0,complain_overflow_dont
, bfd_elf_generic_reloc
,"R_SPARC_HI22", false,0,0x003fffff,true),
97 HOWTO(R_SPARC_22
, 0,2,22,false,0,complain_overflow_bitfield
,bfd_elf_generic_reloc
,"R_SPARC_22", false,0,0x003fffff,true),
98 HOWTO(R_SPARC_13
, 0,2,13,false,0,complain_overflow_bitfield
,bfd_elf_generic_reloc
,"R_SPARC_13", false,0,0x00001fff,true),
99 HOWTO(R_SPARC_LO10
, 0,2,10,false,0,complain_overflow_dont
, bfd_elf_generic_reloc
,"R_SPARC_LO10", false,0,0x000003ff,true),
100 HOWTO(R_SPARC_GOT10
, 0,2,10,false,0,complain_overflow_dont
, bfd_elf_generic_reloc
,"R_SPARC_GOT10", false,0,0x000003ff,true),
101 HOWTO(R_SPARC_GOT13
, 0,2,13,false,0,complain_overflow_signed
, bfd_elf_generic_reloc
,"R_SPARC_GOT13", false,0,0x00001fff,true),
102 HOWTO(R_SPARC_GOT22
, 10,2,22,false,0,complain_overflow_dont
, bfd_elf_generic_reloc
,"R_SPARC_GOT22", false,0,0x003fffff,true),
103 HOWTO(R_SPARC_PC10
, 0,2,10,true, 0,complain_overflow_dont
, bfd_elf_generic_reloc
,"R_SPARC_PC10", false,0,0x000003ff,true),
104 HOWTO(R_SPARC_PC22
, 10,2,22,true, 0,complain_overflow_bitfield
,bfd_elf_generic_reloc
,"R_SPARC_PC22", false,0,0x003fffff,true),
105 HOWTO(R_SPARC_WPLT30
, 2,2,30,true, 0,complain_overflow_signed
, bfd_elf_generic_reloc
,"R_SPARC_WPLT30", false,0,0x3fffffff,true),
106 HOWTO(R_SPARC_COPY
, 0,0,00,false,0,complain_overflow_dont
, bfd_elf_generic_reloc
,"R_SPARC_COPY", false,0,0x00000000,true),
107 HOWTO(R_SPARC_GLOB_DAT
,0,0,00,false,0,complain_overflow_dont
, bfd_elf_generic_reloc
,"R_SPARC_GLOB_DAT",false,0,0x00000000,true),
108 HOWTO(R_SPARC_JMP_SLOT
,0,0,00,false,0,complain_overflow_dont
, bfd_elf_generic_reloc
,"R_SPARC_JMP_SLOT",false,0,0x00000000,true),
109 HOWTO(R_SPARC_RELATIVE
,0,0,00,false,0,complain_overflow_dont
, bfd_elf_generic_reloc
,"R_SPARC_RELATIVE",false,0,0x00000000,true),
110 HOWTO(R_SPARC_UA32
, 0,0,00,false,0,complain_overflow_dont
, bfd_elf_generic_reloc
,"R_SPARC_UA32", false,0,0x00000000,true),
113 struct elf_reloc_map
{
114 unsigned char bfd_reloc_val
;
115 unsigned char elf_reloc_val
;
118 static CONST
struct elf_reloc_map sparc_reloc_map
[] =
120 { BFD_RELOC_NONE
, R_SPARC_NONE
, },
121 { BFD_RELOC_16
, R_SPARC_16
, },
122 { BFD_RELOC_8
, R_SPARC_8
},
123 { BFD_RELOC_8_PCREL
, R_SPARC_DISP8
},
124 { BFD_RELOC_CTOR
, R_SPARC_32
}, /* @@ Assumes 32 bits. */
125 { BFD_RELOC_32
, R_SPARC_32
},
126 { BFD_RELOC_32_PCREL
, R_SPARC_DISP32
},
127 { BFD_RELOC_HI22
, R_SPARC_HI22
},
128 { BFD_RELOC_LO10
, R_SPARC_LO10
, },
129 { BFD_RELOC_32_PCREL_S2
, R_SPARC_WDISP30
},
130 { BFD_RELOC_SPARC22
, R_SPARC_22
},
131 { BFD_RELOC_SPARC13
, R_SPARC_13
},
132 { BFD_RELOC_SPARC_GOT10
, R_SPARC_GOT10
},
133 { BFD_RELOC_SPARC_GOT13
, R_SPARC_GOT13
},
134 { BFD_RELOC_SPARC_GOT22
, R_SPARC_GOT22
},
135 { BFD_RELOC_SPARC_PC10
, R_SPARC_PC10
},
136 { BFD_RELOC_SPARC_PC22
, R_SPARC_PC22
},
137 { BFD_RELOC_SPARC_WPLT30
, R_SPARC_WPLT30
},
138 { BFD_RELOC_SPARC_COPY
, R_SPARC_COPY
},
139 { BFD_RELOC_SPARC_GLOB_DAT
, R_SPARC_GLOB_DAT
},
140 { BFD_RELOC_SPARC_JMP_SLOT
, R_SPARC_JMP_SLOT
},
141 { BFD_RELOC_SPARC_RELATIVE
, R_SPARC_RELATIVE
},
142 { BFD_RELOC_SPARC_WDISP22
, R_SPARC_WDISP22
},
143 /*{ BFD_RELOC_SPARC_UA32, R_SPARC_UA32 }, not used?? */
146 static reloc_howto_type
*
147 bfd_elf32_bfd_reloc_type_lookup (abfd
, code
)
149 bfd_reloc_code_real_type code
;
152 for (i
= 0; i
< sizeof (sparc_reloc_map
) / sizeof (struct elf_reloc_map
); i
++)
154 if (sparc_reloc_map
[i
].bfd_reloc_val
== code
)
155 return &elf_sparc_howto_table
[(int) sparc_reloc_map
[i
].elf_reloc_val
];
161 elf_info_to_howto (abfd
, cache_ptr
, dst
)
164 Elf_Internal_Rela
*dst
;
166 BFD_ASSERT (ELF32_R_TYPE(dst
->r_info
) < (unsigned int) R_SPARC_max
);
167 cache_ptr
->howto
= &elf_sparc_howto_table
[ELF32_R_TYPE(dst
->r_info
)];
171 /* Functions for the SPARC ELF linker. */
173 /* The name of the dynamic interpreter. This is put in the .interp
176 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
178 /* The nop opcode we use. */
180 #define SPARC_NOP 0x01000000
182 /* The size in bytes of an entry in the procedure linkage table. */
184 #define PLT_ENTRY_SIZE 12
186 /* The first four entries in a procedure linkage table are reserved,
187 and the initial contents are unimportant (we zero them out).
188 Subsequent entries look like this. See the SVR4 ABI SPARC
189 supplement to see how this works. */
191 /* sethi %hi(.-.plt0),%g1. We fill in the address later. */
192 #define PLT_ENTRY_WORD0 0x03000000
193 /* b,a .plt0. We fill in the offset later. */
194 #define PLT_ENTRY_WORD1 0x30800000
196 #define PLT_ENTRY_WORD2 SPARC_NOP
198 /* Look through the relocs for a section during the first phase, and
199 allocate space in the global offset table or procedure linkage
203 elf32_sparc_check_relocs (abfd
, info
, sec
, relocs
)
205 struct bfd_link_info
*info
;
207 const Elf_Internal_Rela
*relocs
;
210 Elf_Internal_Shdr
*symtab_hdr
;
211 struct elf_link_hash_entry
**sym_hashes
;
212 bfd_vma
*local_got_offsets
;
213 const Elf_Internal_Rela
*rel
;
214 const Elf_Internal_Rela
*rel_end
;
219 if (info
->relocateable
)
222 dynobj
= elf_hash_table (info
)->dynobj
;
223 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
224 sym_hashes
= elf_sym_hashes (abfd
);
225 local_got_offsets
= elf_local_got_offsets (abfd
);
231 rel_end
= relocs
+ sec
->reloc_count
;
232 for (rel
= relocs
; rel
< rel_end
; rel
++)
235 struct elf_link_hash_entry
*h
;
237 r_symndx
= ELF32_R_SYM (rel
->r_info
);
238 if (r_symndx
< symtab_hdr
->sh_info
)
241 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
243 switch (ELF32_R_TYPE (rel
->r_info
))
248 /* This symbol requires a global offset table entry. */
252 /* Create the .got section. */
253 elf_hash_table (info
)->dynobj
= dynobj
= abfd
;
254 if (! _bfd_elf_create_got_section (dynobj
, info
))
260 sgot
= bfd_get_section_by_name (dynobj
, ".got");
261 BFD_ASSERT (sgot
!= NULL
);
265 && (h
!= NULL
|| info
->shared
))
267 srelgot
= bfd_get_section_by_name (dynobj
, ".rela.got");
270 srelgot
= bfd_make_section (dynobj
, ".rela.got");
272 || ! bfd_set_section_flags (dynobj
, srelgot
,
278 || ! bfd_set_section_alignment (dynobj
, srelgot
, 2))
285 if (h
->got_offset
!= (bfd_vma
) -1)
287 /* We have already allocated space in the .got. */
290 h
->got_offset
= sgot
->_raw_size
;
292 /* Make sure this symbol is output as a dynamic symbol. */
293 if (h
->dynindx
== -1)
295 if (! bfd_elf32_link_record_dynamic_symbol (info
, h
))
299 srelgot
->_raw_size
+= sizeof (Elf32_External_Rela
);
303 /* This is a global offset table entry for a local
305 if (local_got_offsets
== NULL
)
310 size
= symtab_hdr
->sh_info
* sizeof (bfd_vma
);
311 local_got_offsets
= (bfd_vma
*) bfd_alloc (abfd
, size
);
312 if (local_got_offsets
== NULL
)
314 bfd_set_error (bfd_error_no_memory
);
317 elf_local_got_offsets (abfd
) = local_got_offsets
;
318 for (i
= 0; i
< symtab_hdr
->sh_info
; i
++)
319 local_got_offsets
[i
] = (bfd_vma
) -1;
321 if (local_got_offsets
[r_symndx
] != (bfd_vma
) -1)
323 /* We have already allocated space in the .got. */
326 local_got_offsets
[r_symndx
] = sgot
->_raw_size
;
330 /* If we are generating a shared object, we need to
331 output a R_SPARC_RELATIVE reloc so that the
332 dynamic linker can adjust this GOT entry. */
333 srelgot
->_raw_size
+= sizeof (Elf32_External_Rela
);
337 sgot
->_raw_size
+= 4;
342 /* This symbol requires a procedure linkage table entry. We
343 actually build the entry in adjust_dynamic_symbol,
344 because this might be a case of linking PIC code without
345 linking in any dynamic objects, in which case we don't
346 need to generate a procedure linkage table after all. */
350 /* It does not make sense to have a procedure linkage
351 table entry for a local symbol. */
352 bfd_set_error (bfd_error_bad_value
);
356 /* Make sure this symbol is output as a dynamic symbol. */
357 if (h
->dynindx
== -1)
359 if (! bfd_elf32_link_record_dynamic_symbol (info
, h
))
363 h
->elf_link_hash_flags
|= ELF_LINK_HASH_NEEDS_PLT
;
370 && strcmp (h
->root
.root
.string
, "_GLOBAL_OFFSET_TABLE_") == 0)
379 case R_SPARC_WDISP30
:
380 case R_SPARC_WDISP22
:
387 && (sec
->flags
& SEC_ALLOC
) != 0)
389 /* When creating a shared object, we must copy these
390 relocs into the output file. We create a reloc
391 section in dynobj and make room for the reloc. */
396 name
= (bfd_elf_string_from_elf_section
398 elf_elfheader (abfd
)->e_shstrndx
,
399 elf_section_data (sec
)->rel_hdr
.sh_name
));
403 BFD_ASSERT (strncmp (name
, ".rela", 5) == 0
404 && strcmp (bfd_get_section_name (abfd
, sec
),
407 sreloc
= bfd_get_section_by_name (dynobj
, name
);
410 sreloc
= bfd_make_section (dynobj
, name
);
412 || ! bfd_set_section_flags (dynobj
, sreloc
,
418 || ! bfd_set_section_alignment (dynobj
, sreloc
, 2))
423 sreloc
->_raw_size
+= sizeof (Elf32_External_Rela
);
436 /* Adjust a symbol defined by a dynamic object and referenced by a
437 regular object. The current definition is in some section of the
438 dynamic object, but we're not including those sections. We have to
439 change the definition to something the rest of the link can
443 elf32_sparc_adjust_dynamic_symbol (info
, h
)
444 struct bfd_link_info
*info
;
445 struct elf_link_hash_entry
*h
;
449 unsigned int power_of_two
;
451 dynobj
= elf_hash_table (info
)->dynobj
;
453 /* Make sure we know what is going on here. */
454 BFD_ASSERT (dynobj
!= NULL
455 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
)
456 || ((h
->elf_link_hash_flags
457 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
458 && (h
->elf_link_hash_flags
459 & ELF_LINK_HASH_REF_REGULAR
) != 0
460 && (h
->elf_link_hash_flags
461 & ELF_LINK_HASH_DEF_REGULAR
) == 0)));
463 /* If this is a function, put it in the procedure linkage table. We
464 will fill in the contents of the procedure linkage table later
465 (although we could actually do it here). */
466 if (h
->type
== STT_FUNC
467 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0)
469 if (! elf_hash_table (info
)->dynamic_sections_created
)
471 /* This case can occur if we saw a WPLT30 reloc in an input
472 file, but none of the input files were dynamic objects.
473 In such a case, we don't actually need to build a
474 procedure linkage table, and we can just do a WDISP30
476 BFD_ASSERT ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0);
480 s
= bfd_get_section_by_name (dynobj
, ".plt");
481 BFD_ASSERT (s
!= NULL
);
483 /* The first four entries in .plt are reserved. */
484 if (s
->_raw_size
== 0)
485 s
->_raw_size
= 4 * PLT_ENTRY_SIZE
;
487 /* The procedure linkage table has a maximum size. */
488 if (s
->_raw_size
>= 0x400000)
490 bfd_set_error (bfd_error_bad_value
);
494 /* If this symbol is not defined in a regular file, and we are
495 not generating a shared library, then set the symbol to this
496 location in the .plt. This is required to make function
497 pointers compare as equal between the normal executable and
498 the shared library. */
500 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
502 h
->root
.u
.def
.section
= s
;
503 h
->root
.u
.def
.value
= s
->_raw_size
;
506 h
->plt_offset
= s
->_raw_size
;
508 /* Make room for this entry. */
509 s
->_raw_size
+= PLT_ENTRY_SIZE
;
511 /* We also need to make an entry in the .rela.plt section. */
513 s
= bfd_get_section_by_name (dynobj
, ".rela.plt");
514 BFD_ASSERT (s
!= NULL
);
515 s
->_raw_size
+= sizeof (Elf32_External_Rela
);
520 /* If this is a weak symbol, and there is a real definition, the
521 processor independent code will have arranged for us to see the
522 real definition first, and we can just use the same value. */
523 if (h
->weakdef
!= NULL
)
525 BFD_ASSERT (h
->weakdef
->root
.type
== bfd_link_hash_defined
526 || h
->weakdef
->root
.type
== bfd_link_hash_defweak
);
527 h
->root
.u
.def
.section
= h
->weakdef
->root
.u
.def
.section
;
528 h
->root
.u
.def
.value
= h
->weakdef
->root
.u
.def
.value
;
532 /* This is a reference to a symbol defined by a dynamic object which
533 is not a function. */
535 /* If we are creating a shared library, we must presume that the
536 only references to the symbol are via the global offset table.
537 For such cases we need not do anything here; the relocations will
538 be handled correctly by relocate_section. */
542 /* We must allocate the symbol in our .dynbss section, which will
543 become part of the .bss section of the executable. There will be
544 an entry for this symbol in the .dynsym section. The dynamic
545 object will contain position independent code, so all references
546 from the dynamic object to this symbol will go through the global
547 offset table. The dynamic linker will use the .dynsym entry to
548 determine the address it must put in the global offset table, so
549 both the dynamic object and the regular object will refer to the
550 same memory location for the variable. */
552 s
= bfd_get_section_by_name (dynobj
, ".dynbss");
553 BFD_ASSERT (s
!= NULL
);
555 /* If the symbol is currently defined in the .bss section of the
556 dynamic object, then it is OK to simply initialize it to zero.
557 If the symbol is in some other section, we must generate a
558 R_SPARC_COPY reloc to tell the dynamic linker to copy the initial
559 value out of the dynamic object and into the runtime process
560 image. We need to remember the offset into the .rel.bss section
561 we are going to use. */
562 if ((h
->root
.u
.def
.section
->flags
& SEC_LOAD
) != 0)
566 srel
= bfd_get_section_by_name (dynobj
, ".rela.bss");
567 BFD_ASSERT (srel
!= NULL
);
568 srel
->_raw_size
+= sizeof (Elf32_External_Rela
);
569 h
->elf_link_hash_flags
|= ELF_LINK_HASH_NEEDS_COPY
;
572 /* We need to figure out the alignment required for this symbol. I
573 have no idea how ELF linkers handle this. */
574 power_of_two
= bfd_log2 (h
->size
);
575 if (power_of_two
> 3)
578 /* Apply the required alignment. */
579 s
->_raw_size
= BFD_ALIGN (s
->_raw_size
,
580 (bfd_size_type
) (1 << power_of_two
));
581 if (power_of_two
> bfd_get_section_alignment (dynobj
, s
))
583 if (! bfd_set_section_alignment (dynobj
, s
, power_of_two
))
587 /* Define the symbol as being at this point in the section. */
588 h
->root
.u
.def
.section
= s
;
589 h
->root
.u
.def
.value
= s
->_raw_size
;
591 /* Increment the section size to make room for the symbol. */
592 s
->_raw_size
+= h
->size
;
597 /* Set the sizes of the dynamic sections. */
600 elf32_sparc_size_dynamic_sections (output_bfd
, info
)
602 struct bfd_link_info
*info
;
609 dynobj
= elf_hash_table (info
)->dynobj
;
610 BFD_ASSERT (dynobj
!= NULL
);
612 if (elf_hash_table (info
)->dynamic_sections_created
)
614 /* Set the contents of the .interp section to the interpreter. */
617 s
= bfd_get_section_by_name (dynobj
, ".interp");
618 BFD_ASSERT (s
!= NULL
);
619 s
->_raw_size
= sizeof ELF_DYNAMIC_INTERPRETER
;
620 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
623 /* Make space for the trailing nop in .plt. */
624 s
= bfd_get_section_by_name (dynobj
, ".plt");
625 BFD_ASSERT (s
!= NULL
);
626 if (s
->_raw_size
> 0)
631 /* We may have created entries in the .rela.got section.
632 However, if we are not creating the dynamic sections, we will
633 not actually use these entries. Reset the size of .rela.got,
634 which will cause it to get stripped from the output file
636 s
= bfd_get_section_by_name (dynobj
, ".rela.got");
641 /* The check_relocs and adjust_dynamic_symbol entry points have
642 determined the sizes of the various dynamic sections. Allocate
646 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
651 if ((s
->flags
& SEC_IN_MEMORY
) == 0)
654 /* It's OK to base decisions on the section name, because none
655 of the dynobj section names depend upon the input files. */
656 name
= bfd_get_section_name (dynobj
, s
);
660 if (strncmp (name
, ".rela", 5) == 0)
662 if (s
->_raw_size
== 0)
664 /* If we don't need this section, strip it from the
665 output file. This is to handle .rela.bss and
666 .rel.plt. We must create it in
667 create_dynamic_sections, because it must be created
668 before the linker maps input sections to output
669 sections. The linker does that before
670 adjust_dynamic_symbol is called, and it is that
671 function which decides whether anything needs to go
672 into these sections. */
679 /* If this relocation section applies to a read only
680 section, then we probably need a DT_TEXTREL entry. */
681 target
= bfd_get_section_by_name (output_bfd
, name
+ 5);
683 && (target
->flags
& SEC_READONLY
) != 0)
686 if (strcmp (name
, ".rela.plt") == 0)
689 /* We use the reloc_count field as a counter if we need
690 to copy relocs into the output file. */
694 else if (strcmp (name
, ".plt") != 0
695 && strcmp (name
, ".got") != 0)
697 /* It's not one of our sections, so don't allocate space. */
705 for (spp
= &s
->output_section
->owner
->sections
;
706 *spp
!= s
->output_section
;
709 *spp
= s
->output_section
->next
;
710 --s
->output_section
->owner
->section_count
;
715 /* Allocate memory for the section contents. */
716 s
->contents
= (bfd_byte
*) bfd_alloc (dynobj
, s
->_raw_size
);
717 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
719 bfd_set_error (bfd_error_no_memory
);
724 if (elf_hash_table (info
)->dynamic_sections_created
)
726 /* Add some entries to the .dynamic section. We fill in the
727 values later, in elf32_sparc_finish_dynamic_sections, but we
728 must add the entries now so that we get the correct size for
729 the .dynamic section. The DT_DEBUG entry is filled in by the
730 dynamic linker and used by the debugger. */
733 if (! bfd_elf32_add_dynamic_entry (info
, DT_DEBUG
, 0))
737 if (! bfd_elf32_add_dynamic_entry (info
, DT_PLTGOT
, 0))
742 if (! bfd_elf32_add_dynamic_entry (info
, DT_PLTRELSZ
, 0)
743 || ! bfd_elf32_add_dynamic_entry (info
, DT_PLTREL
, DT_RELA
)
744 || ! bfd_elf32_add_dynamic_entry (info
, DT_JMPREL
, 0))
748 if (! bfd_elf32_add_dynamic_entry (info
, DT_RELA
, 0)
749 || ! bfd_elf32_add_dynamic_entry (info
, DT_RELASZ
, 0)
750 || ! bfd_elf32_add_dynamic_entry (info
, DT_RELAENT
,
751 sizeof (Elf32_External_Rela
)))
756 if (! bfd_elf32_add_dynamic_entry (info
, DT_TEXTREL
, 0))
761 /* If we are generating a shared library, we generate a section
762 symbol for each output section. These are local symbols, which
763 means that they must come first in the dynamic symbol table.
764 That means we must increment the dynamic symbol index of every
765 other dynamic symbol. */
770 c
= bfd_count_sections (output_bfd
);
771 elf_link_hash_traverse (elf_hash_table (info
),
772 elf32_sparc_adjust_dynindx
,
774 elf_hash_table (info
)->dynsymcount
+= c
;
776 for (i
= 1, s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
, i
++)
778 elf_section_data (s
)->dynindx
= i
;
779 /* These symbols will have no names, so we don't need to
780 fiddle with dynstr_index. */
787 /* Increment the index of a dynamic symbol by a given amount. Called
788 via elf_link_hash_traverse. */
791 elf32_sparc_adjust_dynindx (h
, cparg
)
792 struct elf_link_hash_entry
*h
;
795 int *cp
= (int *) cparg
;
797 if (h
->dynindx
!= -1)
802 /* Relocate a SPARC ELF section. */
805 elf32_sparc_relocate_section (output_bfd
, info
, input_bfd
, input_section
,
806 contents
, relocs
, local_syms
, local_sections
)
808 struct bfd_link_info
*info
;
810 asection
*input_section
;
812 Elf_Internal_Rela
*relocs
;
813 Elf_Internal_Sym
*local_syms
;
814 asection
**local_sections
;
817 Elf_Internal_Shdr
*symtab_hdr
;
818 struct elf_link_hash_entry
**sym_hashes
;
819 bfd_vma
*local_got_offsets
;
823 Elf_Internal_Rela
*rel
;
824 Elf_Internal_Rela
*relend
;
826 dynobj
= elf_hash_table (info
)->dynobj
;
827 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
828 sym_hashes
= elf_sym_hashes (input_bfd
);
829 local_got_offsets
= elf_local_got_offsets (input_bfd
);
836 relend
= relocs
+ input_section
->reloc_count
;
837 for (; rel
< relend
; rel
++)
840 reloc_howto_type
*howto
;
842 struct elf_link_hash_entry
*h
;
843 Elf_Internal_Sym
*sym
;
846 bfd_reloc_status_type r
;
848 r_type
= ELF32_R_TYPE (rel
->r_info
);
849 if (r_type
< 0 || r_type
>= (int) R_SPARC_max
)
851 bfd_set_error (bfd_error_bad_value
);
854 howto
= elf_sparc_howto_table
+ r_type
;
856 r_symndx
= ELF32_R_SYM (rel
->r_info
);
858 if (info
->relocateable
)
860 /* This is a relocateable link. We don't have to change
861 anything, unless the reloc is against a section symbol,
862 in which case we have to adjust according to where the
863 section symbol winds up in the output section. */
864 if (r_symndx
< symtab_hdr
->sh_info
)
866 sym
= local_syms
+ r_symndx
;
867 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
869 sec
= local_sections
[r_symndx
];
870 rel
->r_addend
+= sec
->output_offset
+ sym
->st_value
;
877 /* This is a final link. */
881 if (r_symndx
< symtab_hdr
->sh_info
)
883 sym
= local_syms
+ r_symndx
;
884 sec
= local_sections
[r_symndx
];
885 relocation
= (sec
->output_section
->vma
891 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
892 if (h
->root
.type
== bfd_link_hash_defined
893 || h
->root
.type
== bfd_link_hash_defweak
)
895 sec
= h
->root
.u
.def
.section
;
896 if ((r_type
== R_SPARC_WPLT30
897 && h
->plt_offset
!= (bfd_vma
) -1)
898 || ((r_type
== R_SPARC_GOT10
899 || r_type
== R_SPARC_GOT13
900 || r_type
== R_SPARC_GOT22
)
901 && elf_hash_table (info
)->dynamic_sections_created
)
903 && (input_section
->flags
& SEC_ALLOC
) != 0
904 && (r_type
== R_SPARC_8
905 || r_type
== R_SPARC_16
906 || r_type
== R_SPARC_32
907 || r_type
== R_SPARC_DISP8
908 || r_type
== R_SPARC_DISP16
909 || r_type
== R_SPARC_DISP32
910 || r_type
== R_SPARC_WDISP30
911 || r_type
== R_SPARC_WDISP22
912 || r_type
== R_SPARC_HI22
913 || r_type
== R_SPARC_22
914 || r_type
== R_SPARC_13
915 || r_type
== R_SPARC_LO10
916 || r_type
== R_SPARC_UA32
917 || ((r_type
== R_SPARC_PC10
918 || r_type
== R_SPARC_PC22
)
919 && strcmp (h
->root
.root
.string
,
920 "_GLOBAL_OFFSET_TABLE_") != 0))))
922 /* In these cases, we don't need the relocation
923 value. We check specially because in some
924 obscure cases sec->output_section will be NULL. */
928 relocation
= (h
->root
.u
.def
.value
929 + sec
->output_section
->vma
930 + sec
->output_offset
);
932 else if (h
->root
.type
== bfd_link_hash_undefweak
)
934 else if (info
->shared
)
938 if (! ((*info
->callbacks
->undefined_symbol
)
939 (info
, h
->root
.root
.string
, input_bfd
,
940 input_section
, rel
->r_offset
)))
951 /* Relocation is to the entry for this symbol in the global
955 sgot
= bfd_get_section_by_name (dynobj
, ".got");
956 BFD_ASSERT (sgot
!= NULL
);
964 BFD_ASSERT (off
!= (bfd_vma
) -1);
966 if (! elf_hash_table (info
)->dynamic_sections_created
)
968 /* This is actually a static link. We must
969 initialize this entry in the global offset table.
970 Since the offset must always be a multiple of 4,
971 we use the least significant bit to record
972 whether we have initialized it already.
974 When doing a dynamic link, we create a .rela.got
975 relocation entry to initialize the value. This
976 is done in the finish_dynamic_symbol routine. */
981 bfd_put_32 (output_bfd
, relocation
,
982 sgot
->contents
+ off
);
987 relocation
= sgot
->output_offset
+ off
;
993 BFD_ASSERT (local_got_offsets
!= NULL
994 && local_got_offsets
[r_symndx
] != (bfd_vma
) -1);
996 off
= local_got_offsets
[r_symndx
];
998 /* The offset must always be a multiple of 4. We use
999 the least significant bit to record whether we have
1000 already processed this entry. */
1005 bfd_put_32 (output_bfd
, relocation
, sgot
->contents
+ off
);
1010 Elf_Internal_Rela outrel
;
1012 /* We need to generate a R_SPARC_RELATIVE reloc
1013 for the dynamic linker. */
1014 srelgot
= bfd_get_section_by_name (dynobj
, ".rela.got");
1015 BFD_ASSERT (srelgot
!= NULL
);
1017 outrel
.r_offset
= (sgot
->output_section
->vma
1018 + sgot
->output_offset
1020 outrel
.r_info
= ELF32_R_INFO (0, R_SPARC_RELATIVE
);
1021 outrel
.r_addend
= 0;
1022 bfd_elf32_swap_reloca_out (output_bfd
, &outrel
,
1023 (((Elf32_External_Rela
*)
1025 + srelgot
->reloc_count
));
1026 ++srelgot
->reloc_count
;
1029 local_got_offsets
[r_symndx
] |= 1;
1032 relocation
= sgot
->output_offset
+ off
;
1037 case R_SPARC_WPLT30
:
1038 /* Relocation is to the entry for this symbol in the
1039 procedure linkage table. */
1040 BFD_ASSERT (h
!= NULL
);
1042 if (h
->plt_offset
== (bfd_vma
) -1)
1044 /* We didn't make a PLT entry for this symbol. This
1045 happens when statically linking PIC code. */
1051 splt
= bfd_get_section_by_name (dynobj
, ".plt");
1052 BFD_ASSERT (splt
!= NULL
);
1055 relocation
= (splt
->output_section
->vma
1056 + splt
->output_offset
1063 && strcmp (h
->root
.root
.string
, "_GLOBAL_OFFSET_TABLE_") == 0)
1070 case R_SPARC_DISP16
:
1071 case R_SPARC_DISP32
:
1072 case R_SPARC_WDISP30
:
1073 case R_SPARC_WDISP22
:
1080 && (input_section
->flags
& SEC_ALLOC
) != 0)
1082 Elf_Internal_Rela outrel
;
1084 /* When generating a shared object, these relocations
1085 are copied into the output file to be resolved at run
1092 name
= (bfd_elf_string_from_elf_section
1094 elf_elfheader (input_bfd
)->e_shstrndx
,
1095 elf_section_data (input_section
)->rel_hdr
.sh_name
));
1099 BFD_ASSERT (strncmp (name
, ".rela", 5) == 0
1100 && strcmp (bfd_get_section_name (input_bfd
,
1104 sreloc
= bfd_get_section_by_name (dynobj
, name
);
1105 BFD_ASSERT (sreloc
!= NULL
);
1108 outrel
.r_offset
= (rel
->r_offset
1109 + input_section
->output_section
->vma
1110 + input_section
->output_offset
);
1113 BFD_ASSERT (h
->dynindx
!= -1);
1114 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
1115 outrel
.r_addend
= rel
->r_addend
;
1119 if (r_type
== R_SPARC_32
)
1121 outrel
.r_info
= ELF32_R_INFO (0, R_SPARC_RELATIVE
);
1122 outrel
.r_addend
= relocation
+ rel
->r_addend
;
1128 sym
= local_syms
+ r_symndx
;
1130 BFD_ASSERT (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
);
1132 sec
= local_sections
[r_symndx
];
1133 if (sec
!= NULL
&& bfd_is_abs_section (sec
))
1135 else if (sec
== NULL
|| sec
->owner
== NULL
)
1137 bfd_set_error (bfd_error_bad_value
);
1144 osec
= sec
->output_section
;
1145 indx
= elf_section_data (osec
)->dynindx
;
1150 outrel
.r_info
= ELF32_R_INFO (indx
, r_type
);
1151 outrel
.r_addend
= relocation
+ rel
->r_addend
;
1155 bfd_elf32_swap_reloca_out (output_bfd
, &outrel
,
1156 (((Elf32_External_Rela
*)
1158 + sreloc
->reloc_count
));
1159 ++sreloc
->reloc_count
;
1161 /* This reloc will be computed at runtime, so there's no
1162 need to do anything now. */
1170 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1171 contents
, rel
->r_offset
,
1172 relocation
, rel
->r_addend
);
1174 if (r
!= bfd_reloc_ok
)
1179 case bfd_reloc_outofrange
:
1181 case bfd_reloc_overflow
:
1186 name
= h
->root
.root
.string
;
1189 name
= bfd_elf_string_from_elf_section (input_bfd
,
1190 symtab_hdr
->sh_link
,
1195 name
= bfd_section_name (input_bfd
, sec
);
1197 if (! ((*info
->callbacks
->reloc_overflow
)
1198 (info
, name
, howto
->name
, (bfd_vma
) 0,
1199 input_bfd
, input_section
, rel
->r_offset
)))
1210 /* Finish up dynamic symbol handling. We set the contents of various
1211 dynamic sections here. */
1214 elf32_sparc_finish_dynamic_symbol (output_bfd
, info
, h
, sym
)
1216 struct bfd_link_info
*info
;
1217 struct elf_link_hash_entry
*h
;
1218 Elf_Internal_Sym
*sym
;
1222 dynobj
= elf_hash_table (info
)->dynobj
;
1224 if (h
->plt_offset
!= (bfd_vma
) -1)
1228 Elf_Internal_Rela rela
;
1230 /* This symbol has an entry in the procedure linkage table. Set
1233 BFD_ASSERT (h
->dynindx
!= -1);
1235 splt
= bfd_get_section_by_name (dynobj
, ".plt");
1236 srela
= bfd_get_section_by_name (dynobj
, ".rela.plt");
1237 BFD_ASSERT (splt
!= NULL
&& srela
!= NULL
);
1239 /* Fill in the entry in the procedure linkage table. */
1240 bfd_put_32 (output_bfd
,
1241 PLT_ENTRY_WORD0
+ h
->plt_offset
,
1242 splt
->contents
+ h
->plt_offset
);
1243 bfd_put_32 (output_bfd
,
1245 + (((- (h
->plt_offset
+ 4)) >> 2) & 0x3fffff)),
1246 splt
->contents
+ h
->plt_offset
+ 4);
1247 bfd_put_32 (output_bfd
, PLT_ENTRY_WORD2
,
1248 splt
->contents
+ h
->plt_offset
+ 8);
1250 /* Fill in the entry in the .rela.plt section. */
1251 rela
.r_offset
= (splt
->output_section
->vma
1252 + splt
->output_offset
1254 rela
.r_info
= ELF32_R_INFO (h
->dynindx
, R_SPARC_JMP_SLOT
);
1256 bfd_elf32_swap_reloca_out (output_bfd
, &rela
,
1257 ((Elf32_External_Rela
*) srela
->contents
1258 + h
->plt_offset
/ PLT_ENTRY_SIZE
- 4));
1260 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1262 /* Mark the symbol as undefined, rather than as defined in
1263 the .plt section. Leave the value alone. */
1264 sym
->st_shndx
= SHN_UNDEF
;
1268 if (h
->got_offset
!= (bfd_vma
) -1)
1272 Elf_Internal_Rela rela
;
1274 /* This symbol has an entry in the global offset table. Set it
1277 BFD_ASSERT (h
->dynindx
!= -1);
1279 sgot
= bfd_get_section_by_name (dynobj
, ".got");
1280 srela
= bfd_get_section_by_name (dynobj
, ".rela.got");
1281 BFD_ASSERT (sgot
!= NULL
&& srela
!= NULL
);
1283 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
+ h
->got_offset
);
1285 rela
.r_offset
= (sgot
->output_section
->vma
1286 + sgot
->output_offset
1288 rela
.r_info
= ELF32_R_INFO (h
->dynindx
, R_SPARC_GLOB_DAT
);
1290 bfd_elf32_swap_reloca_out (output_bfd
, &rela
,
1291 ((Elf32_External_Rela
*) srela
->contents
1292 + srela
->reloc_count
));
1293 ++srela
->reloc_count
;
1296 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_COPY
) != 0)
1299 Elf_Internal_Rela rela
;
1301 /* This symbols needs a copy reloc. Set it up. */
1303 BFD_ASSERT (h
->dynindx
!= -1);
1305 s
= bfd_get_section_by_name (h
->root
.u
.def
.section
->owner
,
1307 BFD_ASSERT (s
!= NULL
);
1309 rela
.r_offset
= (h
->root
.u
.def
.value
1310 + h
->root
.u
.def
.section
->output_section
->vma
1311 + h
->root
.u
.def
.section
->output_offset
);
1312 rela
.r_info
= ELF32_R_INFO (h
->dynindx
, R_SPARC_COPY
);
1314 bfd_elf32_swap_reloca_out (output_bfd
, &rela
,
1315 ((Elf32_External_Rela
*) s
->contents
1320 /* Mark some specially defined symbols as absolute. */
1321 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
1322 || strcmp (h
->root
.root
.string
, "_GLOBAL_OFFSET_TABLE_") == 0
1323 || strcmp (h
->root
.root
.string
, "_PROCEDURE_LINKAGE_TABLE_") == 0)
1324 sym
->st_shndx
= SHN_ABS
;
1329 /* Finish up the dynamic sections. */
1332 elf32_sparc_finish_dynamic_sections (output_bfd
, info
)
1334 struct bfd_link_info
*info
;
1340 dynobj
= elf_hash_table (info
)->dynobj
;
1342 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
1344 if (elf_hash_table (info
)->dynamic_sections_created
)
1347 Elf32_External_Dyn
*dyncon
, *dynconend
;
1349 splt
= bfd_get_section_by_name (dynobj
, ".plt");
1350 BFD_ASSERT (splt
!= NULL
&& sdyn
!= NULL
);
1352 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
1353 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->_raw_size
);
1354 for (; dyncon
< dynconend
; dyncon
++)
1356 Elf_Internal_Dyn dyn
;
1360 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
1364 case DT_PLTGOT
: name
= ".plt"; size
= false; break;
1365 case DT_PLTRELSZ
: name
= ".rela.plt"; size
= true; break;
1366 case DT_JMPREL
: name
= ".rela.plt"; size
= false; break;
1367 default: name
= NULL
; size
= false; break;
1374 s
= bfd_get_section_by_name (output_bfd
, name
);
1380 dyn
.d_un
.d_ptr
= s
->vma
;
1383 if (s
->_cooked_size
!= 0)
1384 dyn
.d_un
.d_val
= s
->_cooked_size
;
1386 dyn
.d_un
.d_val
= s
->_raw_size
;
1389 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
1393 /* Clear the first four entries in the procedure linkage table,
1394 and put a nop in the last four bytes. */
1395 if (splt
->_raw_size
> 0)
1397 memset (splt
->contents
, 0, 4 * PLT_ENTRY_SIZE
);
1398 bfd_put_32 (output_bfd
, SPARC_NOP
,
1399 splt
->contents
+ splt
->_raw_size
- 4);
1402 elf_section_data (splt
->output_section
)->this_hdr
.sh_entsize
=
1406 /* Set the first entry in the global offset table to the address of
1407 the dynamic section. */
1408 sgot
= bfd_get_section_by_name (dynobj
, ".got");
1409 BFD_ASSERT (sgot
!= NULL
);
1410 if (sgot
->_raw_size
> 0)
1413 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
);
1415 bfd_put_32 (output_bfd
,
1416 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
1420 elf_section_data (sgot
->output_section
)->this_hdr
.sh_entsize
= 4;
1426 Elf_Internal_Sym sym
;
1428 /* Set up the section symbols for the output sections. */
1430 sdynsym
= bfd_get_section_by_name (dynobj
, ".dynsym");
1431 BFD_ASSERT (sdynsym
!= NULL
);
1435 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
1438 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
1442 sym
.st_value
= s
->vma
;
1444 indx
= elf_section_data (s
)->this_idx
;
1445 BFD_ASSERT (indx
> 0);
1446 sym
.st_shndx
= indx
;
1448 bfd_elf32_swap_symbol_out (output_bfd
, &sym
,
1449 (char*) ((Elf32_External_Sym
*) sdynsym
->contents
1450 + elf_section_data (s
)->dynindx
));
1453 /* Set the sh_info field of the output .dynsym section to the
1454 index of the first global symbol. */
1455 elf_section_data (sdynsym
->output_section
)->this_hdr
.sh_info
=
1456 bfd_count_sections (output_bfd
) + 1;
1462 #define TARGET_BIG_SYM bfd_elf32_sparc_vec
1463 #define TARGET_BIG_NAME "elf32-sparc"
1464 #define ELF_ARCH bfd_arch_sparc
1465 #define ELF_MACHINE_CODE EM_SPARC
1466 #define ELF_MAXPAGESIZE 0x10000
1467 #define elf_backend_create_dynamic_sections \
1468 _bfd_elf_create_dynamic_sections
1469 #define elf_backend_check_relocs elf32_sparc_check_relocs
1470 #define elf_backend_adjust_dynamic_symbol \
1471 elf32_sparc_adjust_dynamic_symbol
1472 #define elf_backend_size_dynamic_sections \
1473 elf32_sparc_size_dynamic_sections
1474 #define elf_backend_relocate_section elf32_sparc_relocate_section
1475 #define elf_backend_finish_dynamic_symbol \
1476 elf32_sparc_finish_dynamic_symbol
1477 #define elf_backend_finish_dynamic_sections \
1478 elf32_sparc_finish_dynamic_sections
1479 #define elf_backend_want_got_plt 0
1480 #define elf_backend_plt_readonly 1
1481 #define elf_backend_want_plt_sym 1
1483 #include "elf32-target.h"