1 /* IBM S/390-specific support for 32-bit ELF
2 Copyright 2000, 2001 Free Software Foundation, Inc.
3 Contributed by Carl B. Pedersen and Martin Schwidefsky.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
28 static reloc_howto_type *elf_s390_reloc_type_lookup
29 PARAMS ((bfd *, bfd_reloc_code_real_type));
30 static void elf_s390_info_to_howto
31 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
32 static boolean elf_s390_is_local_label_name PARAMS ((bfd *, const char *));
33 static struct bfd_hash_entry *elf_s390_link_hash_newfunc
34 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
35 static struct bfd_link_hash_table *elf_s390_link_hash_table_create
37 static boolean elf_s390_check_relocs
38 PARAMS ((bfd *, struct bfd_link_info *, asection *,
39 const Elf_Internal_Rela *));
40 static asection *elf_s390_gc_mark_hook
41 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
42 struct elf_link_hash_entry *, Elf_Internal_Sym *sym));
43 static boolean elf_s390_gc_sweep_hook
44 PARAMS ((bfd *, struct bfd_link_info *, asection *,
45 const Elf_Internal_Rela *));
46 static boolean elf_s390_adjust_dynamic_symbol
47 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
48 static boolean elf_s390_size_dynamic_sections
49 PARAMS ((bfd *, struct bfd_link_info *));
50 static boolean elf_s390_relocate_section
51 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
52 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
53 static boolean elf_s390_finish_dynamic_symbol
54 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
56 static boolean elf_s390_finish_dynamic_sections
57 PARAMS ((bfd *, struct bfd_link_info *));
58 static boolean elf_s390_object_p PARAMS ((bfd *));
59 static enum elf_reloc_type_class elf_s390_reloc_type_class
60 PARAMS ((const Elf_Internal_Rela *));
62 #define USE_RELA 1 /* We want RELA relocations, not REL. */
66 /* The relocation "howto" table. */
68 static reloc_howto_type elf_howto_table[] =
70 HOWTO (R_390_NONE, /* type */
72 0, /* size (0 = byte, 1 = short, 2 = long) */
74 false, /* pc_relative */
76 complain_overflow_dont, /* complain_on_overflow */
77 bfd_elf_generic_reloc, /* special_function */
78 "R_390_NONE", /* name */
79 false, /* partial_inplace */
82 false), /* pcrel_offset */
84 HOWTO(R_390_8, 0, 0, 8, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false),
85 HOWTO(R_390_12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false),
86 HOWTO(R_390_16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false),
87 HOWTO(R_390_32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false),
88 HOWTO(R_390_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true),
89 HOWTO(R_390_GOT12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false),
90 HOWTO(R_390_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false),
91 HOWTO(R_390_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true),
92 HOWTO(R_390_COPY, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_COPY", false, 0,0xffffffff, false),
93 HOWTO(R_390_GLOB_DAT, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GLOB_DAT",false, 0,0xffffffff, false),
94 HOWTO(R_390_JMP_SLOT, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_JMP_SLOT",false, 0,0xffffffff, false),
95 HOWTO(R_390_RELATIVE, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_RELATIVE",false, 0,0xffffffff, false),
96 HOWTO(R_390_GOTOFF, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTOFF", false, 0,0xffffffff, false),
97 HOWTO(R_390_GOTPC, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,0xffffffff, true),
98 HOWTO(R_390_GOT16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false),
99 HOWTO(R_390_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true),
100 HOWTO(R_390_PC16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true),
101 HOWTO(R_390_PLT16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true),
104 /* GNU extension to record C++ vtable hierarchy. */
105 static reloc_howto_type elf32_s390_vtinherit_howto =
106 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false);
107 static reloc_howto_type elf32_s390_vtentry_howto =
108 HOWTO (R_390_GNU_VTENTRY, 0,2,0,false,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", false,0,0, false);
110 static reloc_howto_type *
111 elf_s390_reloc_type_lookup (abfd, code)
112 bfd *abfd ATTRIBUTE_UNUSED;
113 bfd_reloc_code_real_type code;
117 return &elf_howto_table[(int) R_390_NONE];
119 return &elf_howto_table[(int) R_390_8];
120 case BFD_RELOC_390_12:
121 return &elf_howto_table[(int) R_390_12];
123 return &elf_howto_table[(int) R_390_16];
125 return &elf_howto_table[(int) R_390_32];
127 return &elf_howto_table[(int) R_390_32];
128 case BFD_RELOC_32_PCREL:
129 return &elf_howto_table[(int) R_390_PC32];
130 case BFD_RELOC_390_GOT12:
131 return &elf_howto_table[(int) R_390_GOT12];
132 case BFD_RELOC_32_GOT_PCREL:
133 return &elf_howto_table[(int) R_390_GOT32];
134 case BFD_RELOC_390_PLT32:
135 return &elf_howto_table[(int) R_390_PLT32];
136 case BFD_RELOC_390_COPY:
137 return &elf_howto_table[(int) R_390_COPY];
138 case BFD_RELOC_390_GLOB_DAT:
139 return &elf_howto_table[(int) R_390_GLOB_DAT];
140 case BFD_RELOC_390_JMP_SLOT:
141 return &elf_howto_table[(int) R_390_JMP_SLOT];
142 case BFD_RELOC_390_RELATIVE:
143 return &elf_howto_table[(int) R_390_RELATIVE];
144 case BFD_RELOC_32_GOTOFF:
145 return &elf_howto_table[(int) R_390_GOTOFF];
146 case BFD_RELOC_390_GOTPC:
147 return &elf_howto_table[(int) R_390_GOTPC];
148 case BFD_RELOC_390_GOT16:
149 return &elf_howto_table[(int) R_390_GOT16];
150 case BFD_RELOC_16_PCREL:
151 return &elf_howto_table[(int) R_390_PC16];
152 case BFD_RELOC_390_PC16DBL:
153 return &elf_howto_table[(int) R_390_PC16DBL];
154 case BFD_RELOC_390_PLT16DBL:
155 return &elf_howto_table[(int) R_390_PLT16DBL];
156 case BFD_RELOC_VTABLE_INHERIT:
157 return &elf32_s390_vtinherit_howto;
158 case BFD_RELOC_VTABLE_ENTRY:
159 return &elf32_s390_vtentry_howto;
166 /* We need to use ELF32_R_TYPE so we have our own copy of this function,
167 and elf32-s390.c has its own copy. */
170 elf_s390_info_to_howto (abfd, cache_ptr, dst)
171 bfd *abfd ATTRIBUTE_UNUSED;
173 Elf_Internal_Rela *dst;
175 switch (ELF32_R_TYPE(dst->r_info))
177 case R_390_GNU_VTINHERIT:
178 cache_ptr->howto = &elf32_s390_vtinherit_howto;
181 case R_390_GNU_VTENTRY:
182 cache_ptr->howto = &elf32_s390_vtentry_howto;
186 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_390_max);
187 cache_ptr->howto = &elf_howto_table[ELF32_R_TYPE(dst->r_info)];
192 elf_s390_is_local_label_name (abfd, name)
196 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
199 return _bfd_elf_is_local_label_name (abfd, name);
202 /* Functions for the 390 ELF linker. */
204 /* The name of the dynamic interpreter. This is put in the .interp
207 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
209 /* The nop opcode we use. */
211 #define s390_NOP 0x07070707
214 /* The size in bytes of the first entry in the procedure linkage table. */
215 #define PLT_FIRST_ENTRY_SIZE 32
216 /* The size in bytes of an entry in the procedure linkage table. */
217 #define PLT_ENTRY_SIZE 32
219 #define GOT_ENTRY_SIZE 4
221 /* The first three entries in a procedure linkage table are reserved,
222 and the initial contents are unimportant (we zero them out).
223 Subsequent entries look like this. See the SVR4 ABI 386
224 supplement to see how this works. */
226 /* For the s390, simple addr offset can only be 0 - 4096.
227 To use the full 2 GB address space, several instructions
228 are needed to load an address in a register and execute
229 a branch( or just saving the address)
231 Furthermore, only r 0 and 1 are free to use!!! */
233 /* The first 3 words in the GOT are then reserved.
234 Word 0 is the address of the dynamic table.
235 Word 1 is a pointer to a structure describing the object
236 Word 2 is used to point to the loader entry address.
238 The code for position independand PLT entries looks like this:
240 r12 holds addr of the current GOT at entry to the PLT
242 The GOT holds the address in the PLT to be executed.
243 The loader then gets:
244 24(15) = Pointer to the structure describing the object.
245 28(15) = Offset in symbol table
247 The loader must then find the module where the function is
248 and insert the address in the GOT.
250 Note: 390 can only address +- 64 K relative.
251 We check if offset > 65536, then make a relative branch -64xxx
252 back to a previous defined branch
254 PLT1: BASR 1,0 # 2 bytes
255 L 1,22(1) # 4 bytes Load offset in GOT in r 1
256 L 1,(1,12) # 4 bytes Load address from GOT in r1
257 BCR 15,1 # 2 bytes Jump to address
258 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
259 L 1,14(1) # 4 bytes Load offset in symol table in r1
260 BRC 15,-x # 4 bytes Jump to start of PLT
261 .word 0 # 2 bytes filler
262 .long ? # 4 bytes offset in GOT
263 .long ? # 4 bytes offset into symbol table
265 This was the general case. There are two additional, optimizes PLT
266 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768.
267 First the one for GOT offsets < 4096:
269 PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1
270 BCR 15,1 # 2 bytes Jump to address
271 .word 0,0,0 # 6 bytes filler
272 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
273 L 1,14(1) # 4 bytes Load offset in symbol table in r1
274 BRC 15,-x # 4 bytes Jump to start of PLT
275 .word 0,0,0 # 6 bytes filler
276 .long ? # 4 bytes offset into symbol table
278 Second the one for GOT offsets < 32768:
280 PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1
281 L 1,(1,12) # 4 bytes Load address from GOT to r1
282 BCR 15,1 # 2 bytes Jump to address
283 .word 0 # 2 bytes filler
284 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
285 L 1,14(1) # 4 bytes Load offset in symbol table in r1
286 BRC 15,-x # 4 bytes Jump to start of PLT
287 .word 0,0,0 # 6 bytes filler
288 .long ? # 4 bytes offset into symbol table
290 Total = 32 bytes per PLT entry
292 The code for static build PLT entries looks like this:
294 PLT1: BASR 1,0 # 2 bytes
295 L 1,22(1) # 4 bytes Load address of GOT entry
296 L 1,0(0,1) # 4 bytes Load address from GOT in r1
297 BCR 15,1 # 2 bytes Jump to address
298 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
299 L 1,14(1) # 4 bytes Load offset in symbol table in r1
300 BRC 15,-x # 4 bytes Jump to start of PLT
301 .word 0 # 2 bytes filler
302 .long ? # 4 bytes address of GOT entry
303 .long ? # 4 bytes offset into symbol table */
305 #define PLT_PIC_ENTRY_WORD0 0x0d105810
306 #define PLT_PIC_ENTRY_WORD1 0x10165811
307 #define PLT_PIC_ENTRY_WORD2 0xc00007f1
308 #define PLT_PIC_ENTRY_WORD3 0x0d105810
309 #define PLT_PIC_ENTRY_WORD4 0x100ea7f4
311 #define PLT_PIC12_ENTRY_WORD0 0x5810c000
312 #define PLT_PIC12_ENTRY_WORD1 0x07f10000
313 #define PLT_PIC12_ENTRY_WORD2 0x00000000
314 #define PLT_PIC12_ENTRY_WORD3 0x0d105810
315 #define PLT_PIC12_ENTRY_WORD4 0x100ea7f4
317 #define PLT_PIC16_ENTRY_WORD0 0xa7180000
318 #define PLT_PIC16_ENTRY_WORD1 0x5811c000
319 #define PLT_PIC16_ENTRY_WORD2 0x07f10000
320 #define PLT_PIC16_ENTRY_WORD3 0x0d105810
321 #define PLT_PIC16_ENTRY_WORD4 0x100ea7f4
323 #define PLT_ENTRY_WORD0 0x0d105810
324 #define PLT_ENTRY_WORD1 0x10165810
325 #define PLT_ENTRY_WORD2 0x100007f1
326 #define PLT_ENTRY_WORD3 0x0d105810
327 #define PLT_ENTRY_WORD4 0x100ea7f4
329 /* The first PLT entry pushes the offset into the symbol table
330 from R1 onto the stack at 8(15) and the loader object info
331 at 12(15), loads the loader address in R1 and jumps to it. */
333 /* The first entry in the PLT for PIC code:
336 ST 1,28(15) # R1 has offset into symbol table
337 L 1,4(12) # Get loader ino(object struct address)
338 ST 1,24(15) # Store address
339 L 1,8(12) # Entry address of loader in R1
340 BR 1 # Jump to loader
342 The first entry in the PLT for static code:
345 ST 1,28(15) # R1 has offset into symbol table
347 L 1,18(0,1) # Get address of GOT
348 MVC 24(4,15),4(1) # Move loader ino to stack
349 L 1,8(1) # Get address of loader
350 BR 1 # Jump to loader
352 .long got # address of GOT */
354 #define PLT_PIC_FIRST_ENTRY_WORD0 0x5010f01c
355 #define PLT_PIC_FIRST_ENTRY_WORD1 0x5810c004
356 #define PLT_PIC_FIRST_ENTRY_WORD2 0x5010f018
357 #define PLT_PIC_FIRST_ENTRY_WORD3 0x5810c008
358 #define PLT_PIC_FIRST_ENTRY_WORD4 0x07f10000
360 #define PLT_FIRST_ENTRY_WORD0 0x5010f01c
361 #define PLT_FIRST_ENTRY_WORD1 0x0d105810
362 #define PLT_FIRST_ENTRY_WORD2 0x1012D203
363 #define PLT_FIRST_ENTRY_WORD3 0xf0181004
364 #define PLT_FIRST_ENTRY_WORD4 0x58101008
365 #define PLT_FIRST_ENTRY_WORD5 0x07f10000
367 /* The s390 linker needs to keep track of the number of relocs that it
368 decides to copy in check_relocs for each symbol. This is so that
369 it can discard PC relative relocs if it doesn't need them when
370 linking with -Bsymbolic. We store the information in a field
371 extending the regular ELF linker hash table. */
373 /* This structure keeps track of the number of PC relative relocs we
374 have copied for a given symbol. */
376 struct elf_s390_pcrel_relocs_copied
379 struct elf_s390_pcrel_relocs_copied *next;
380 /* A section in dynobj. */
382 /* Number of relocs copied in this section. */
386 /* s390 ELF linker hash entry. */
388 struct elf_s390_link_hash_entry
390 struct elf_link_hash_entry root;
392 /* Number of PC relative relocs copied for this symbol. */
393 struct elf_s390_pcrel_relocs_copied *pcrel_relocs_copied;
396 /* s390 ELF linker hash table. */
398 struct elf_s390_link_hash_table
400 struct elf_link_hash_table root;
403 /* Declare this now that the above structures are defined. */
405 static boolean elf_s390_discard_copies
406 PARAMS ((struct elf_s390_link_hash_entry *, PTR));
408 /* Traverse an s390 ELF linker hash table. */
410 #define elf_s390_link_hash_traverse(table, func, info) \
411 (elf_link_hash_traverse \
413 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
416 /* Get the s390 ELF linker hash table from a link_info structure. */
418 #define elf_s390_hash_table(p) \
419 ((struct elf_s390_link_hash_table *) ((p)->hash))
421 /* Create an entry in an s390 ELF linker hash table. */
423 static struct bfd_hash_entry *
424 elf_s390_link_hash_newfunc (entry, table, string)
425 struct bfd_hash_entry *entry;
426 struct bfd_hash_table *table;
429 struct elf_s390_link_hash_entry *ret =
430 (struct elf_s390_link_hash_entry *) entry;
432 /* Allocate the structure if it has not already been allocated by a
434 if (ret == (struct elf_s390_link_hash_entry *) NULL)
435 ret = ((struct elf_s390_link_hash_entry *)
436 bfd_hash_allocate (table,
437 sizeof (struct elf_s390_link_hash_entry)));
438 if (ret == (struct elf_s390_link_hash_entry *) NULL)
439 return (struct bfd_hash_entry *) ret;
441 /* Call the allocation method of the superclass. */
442 ret = ((struct elf_s390_link_hash_entry *)
443 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
445 if (ret != (struct elf_s390_link_hash_entry *) NULL)
447 ret->pcrel_relocs_copied = NULL;
450 return (struct bfd_hash_entry *) ret;
453 /* Create an s390 ELF linker hash table. */
455 static struct bfd_link_hash_table *
456 elf_s390_link_hash_table_create (abfd)
459 struct elf_s390_link_hash_table *ret;
460 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
462 ret = (struct elf_s390_link_hash_table *) bfd_alloc (abfd, amt);
463 if (ret == (struct elf_s390_link_hash_table *) NULL)
466 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
467 elf_s390_link_hash_newfunc))
469 bfd_release (abfd, ret);
473 return &ret->root.root;
477 /* Look through the relocs for a section during the first phase, and
478 allocate space in the global offset table or procedure linkage
482 elf_s390_check_relocs (abfd, info, sec, relocs)
484 struct bfd_link_info *info;
486 const Elf_Internal_Rela *relocs;
489 Elf_Internal_Shdr *symtab_hdr;
490 struct elf_link_hash_entry **sym_hashes;
491 bfd_signed_vma *local_got_refcounts;
492 const Elf_Internal_Rela *rel;
493 const Elf_Internal_Rela *rel_end;
498 if (info->relocateable)
501 dynobj = elf_hash_table (info)->dynobj;
502 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
503 sym_hashes = elf_sym_hashes (abfd);
504 local_got_refcounts = elf_local_got_offsets (abfd);
510 rel_end = relocs + sec->reloc_count;
511 for (rel = relocs; rel < rel_end; rel++)
513 unsigned long r_symndx;
514 struct elf_link_hash_entry *h;
516 r_symndx = ELF32_R_SYM (rel->r_info);
518 if (r_symndx < symtab_hdr->sh_info)
521 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
523 /* Some relocs require a global offset table. */
526 switch (ELF32_R_TYPE (rel->r_info))
533 elf_hash_table (info)->dynobj = dynobj = abfd;
534 if (! _bfd_elf_create_got_section (dynobj, info))
544 switch (ELF32_R_TYPE (rel->r_info))
549 /* This symbol requires a global offset table entry. */
553 sgot = bfd_get_section_by_name (dynobj, ".got");
554 BFD_ASSERT (sgot != NULL);
559 && (h != NULL || info->shared))
561 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
564 srelgot = bfd_make_section (dynobj, ".rela.got");
566 || ! bfd_set_section_flags (dynobj, srelgot,
573 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
580 if (h->got.refcount == 0)
582 /* Make sure this symbol is output as a dynamic symbol. */
583 if (h->dynindx == -1)
585 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
589 sgot->_raw_size += 4;
590 srelgot->_raw_size += sizeof (Elf32_External_Rela);
592 h->got.refcount += 1;
596 /* This is a global offset table entry for a local symbol. */
597 if (local_got_refcounts == NULL)
601 size = symtab_hdr->sh_info;
602 size *= sizeof (bfd_signed_vma);
603 local_got_refcounts = (bfd_signed_vma *)
604 bfd_zalloc (abfd, size);
605 if (local_got_refcounts == NULL)
607 elf_local_got_refcounts (abfd) = local_got_refcounts;
609 if (local_got_refcounts[r_symndx] == 0)
611 sgot->_raw_size += 4;
614 /* If we are generating a shared object, we need to
615 output a R_390_RELATIVE reloc so that the dynamic
616 linker can adjust this GOT entry. */
617 srelgot->_raw_size += sizeof (Elf32_External_Rela);
620 local_got_refcounts[r_symndx] += 1;
626 /* This symbol requires a procedure linkage table entry. We
627 actually build the entry in adjust_dynamic_symbol,
628 because this might be a case of linking PIC code which is
629 never referenced by a dynamic object, in which case we
630 don't need to generate a procedure linkage table entry
633 /* If this is a local symbol, we resolve it directly without
634 creating a procedure linkage table entry. */
638 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
639 h->plt.refcount += 1;
649 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
651 /* If we are creating a shared library, and this is a reloc
652 against a global symbol, or a non PC relative reloc
653 against a local symbol, then we need to copy the reloc
654 into the shared library. However, if we are linking with
655 -Bsymbolic, we do not need to copy a reloc against a
656 global symbol which is defined in an object we are
657 including in the link (i.e., DEF_REGULAR is set). At
658 this point we have not seen all the input files, so it is
659 possible that DEF_REGULAR is not set now but will be set
660 later (it is never cleared). We account for that
661 possibility below by storing information in the
662 pcrel_relocs_copied field of the hash table entry. */
664 && (sec->flags & SEC_ALLOC) != 0
665 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16 &&
666 ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL &&
667 ELF32_R_TYPE (rel->r_info) != R_390_PC32)
670 || (h->elf_link_hash_flags
671 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
673 /* When creating a shared object, we must copy these
674 reloc types into the output file. We create a reloc
675 section in dynobj and make room for this reloc. */
680 name = (bfd_elf_string_from_elf_section
682 elf_elfheader (abfd)->e_shstrndx,
683 elf_section_data (sec)->rel_hdr.sh_name));
687 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
688 && strcmp (bfd_get_section_name (abfd, sec),
691 sreloc = bfd_get_section_by_name (dynobj, name);
696 sreloc = bfd_make_section (dynobj, name);
697 flags = (SEC_HAS_CONTENTS | SEC_READONLY
698 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
699 if ((sec->flags & SEC_ALLOC) != 0)
700 flags |= SEC_ALLOC | SEC_LOAD;
702 || ! bfd_set_section_flags (dynobj, sreloc, flags)
703 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
706 if (sec->flags & SEC_READONLY)
707 info->flags |= DF_TEXTREL;
710 sreloc->_raw_size += sizeof (Elf32_External_Rela);
712 /* If we are linking with -Bsymbolic, and this is a
713 global symbol, we count the number of PC relative
714 relocations we have entered for this symbol, so that
715 we can discard them again if the symbol is later
716 defined by a regular object. Note that this function
717 is only called if we are using an elf_s390 linker
718 hash table, which means that h is really a pointer to
719 an elf_s390_link_hash_entry. */
721 && (ELF32_R_TYPE (rel->r_info) == R_390_PC16 ||
722 ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL ||
723 ELF32_R_TYPE (rel->r_info) == R_390_PC32))
725 struct elf_s390_link_hash_entry *eh;
726 struct elf_s390_pcrel_relocs_copied *p;
728 eh = (struct elf_s390_link_hash_entry *) h;
730 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
731 if (p->section == sreloc)
736 p = ((struct elf_s390_pcrel_relocs_copied *)
737 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
740 p->next = eh->pcrel_relocs_copied;
741 eh->pcrel_relocs_copied = p;
752 /* This relocation describes the C++ object vtable hierarchy.
753 Reconstruct it for later use during GC. */
754 case R_390_GNU_VTINHERIT:
755 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
759 /* This relocation describes which C++ vtable entries are actually
760 used. Record for later use during GC. */
761 case R_390_GNU_VTENTRY:
762 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
774 /* Return the section that should be marked against GC for a given
778 elf_s390_gc_mark_hook (abfd, info, rel, h, sym)
780 struct bfd_link_info *info ATTRIBUTE_UNUSED;
781 Elf_Internal_Rela *rel;
782 struct elf_link_hash_entry *h;
783 Elf_Internal_Sym *sym;
787 switch (ELF32_R_TYPE (rel->r_info))
789 case R_390_GNU_VTINHERIT:
790 case R_390_GNU_VTENTRY:
794 switch (h->root.type)
796 case bfd_link_hash_defined:
797 case bfd_link_hash_defweak:
798 return h->root.u.def.section;
800 case bfd_link_hash_common:
801 return h->root.u.c.p->section;
810 if (!(elf_bad_symtab (abfd)
811 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
812 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
813 && sym->st_shndx != SHN_COMMON))
815 return bfd_section_from_elf_index (abfd, sym->st_shndx);
822 /* Update the got entry reference counts for the section being removed. */
825 elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
826 bfd *abfd ATTRIBUTE_UNUSED;
827 struct bfd_link_info *info ATTRIBUTE_UNUSED;
828 asection *sec ATTRIBUTE_UNUSED;
829 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
831 Elf_Internal_Shdr *symtab_hdr;
832 struct elf_link_hash_entry **sym_hashes;
833 bfd_signed_vma *local_got_refcounts;
834 const Elf_Internal_Rela *rel, *relend;
835 unsigned long r_symndx;
836 struct elf_link_hash_entry *h;
841 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
842 sym_hashes = elf_sym_hashes (abfd);
843 local_got_refcounts = elf_local_got_refcounts (abfd);
845 dynobj = elf_hash_table (info)->dynobj;
849 sgot = bfd_get_section_by_name (dynobj, ".got");
850 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
852 relend = relocs + sec->reloc_count;
853 for (rel = relocs; rel < relend; rel++)
854 switch (ELF32_R_TYPE (rel->r_info))
861 r_symndx = ELF32_R_SYM (rel->r_info);
862 if (r_symndx >= symtab_hdr->sh_info)
864 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
865 if (h->got.refcount > 0)
867 h->got.refcount -= 1;
868 if (h->got.refcount == 0)
870 sgot->_raw_size -= 4;
871 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
875 else if (local_got_refcounts != NULL)
877 if (local_got_refcounts[r_symndx] > 0)
879 local_got_refcounts[r_symndx] -= 1;
880 if (local_got_refcounts[r_symndx] == 0)
882 sgot->_raw_size -= 4;
884 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
892 r_symndx = ELF32_R_SYM (rel->r_info);
893 if (r_symndx >= symtab_hdr->sh_info)
895 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
896 if (h->plt.refcount > 0)
897 h->plt.refcount -= 1;
908 /* Adjust a symbol defined by a dynamic object and referenced by a
909 regular object. The current definition is in some section of the
910 dynamic object, but we're not including those sections. We have to
911 change the definition to something the rest of the link can
915 elf_s390_adjust_dynamic_symbol (info, h)
916 struct bfd_link_info *info;
917 struct elf_link_hash_entry *h;
921 unsigned int power_of_two;
923 dynobj = elf_hash_table (info)->dynobj;
925 /* Make sure we know what is going on here. */
926 BFD_ASSERT (dynobj != NULL
927 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
928 || h->weakdef != NULL
929 || ((h->elf_link_hash_flags
930 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
931 && (h->elf_link_hash_flags
932 & ELF_LINK_HASH_REF_REGULAR) != 0
933 && (h->elf_link_hash_flags
934 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
936 /* If this is a function, put it in the procedure linkage table. We
937 will fill in the contents of the procedure linkage table later
938 (although we could actually do it here). */
939 if (h->type == STT_FUNC
940 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
943 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
944 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0)
945 || (info->shared && h->plt.refcount <= 0))
947 /* This case can occur if we saw a PLT32 reloc in an input
948 file, but the symbol was never referred to by a dynamic
949 object, or if all references were garbage collected. In
950 such a case, we don't actually need to build a procedure
951 linkage table, and we can just do a PC32 reloc instead. */
952 h->plt.offset = (bfd_vma) -1;
953 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
957 /* Make sure this symbol is output as a dynamic symbol. */
958 if (h->dynindx == -1)
960 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
964 s = bfd_get_section_by_name (dynobj, ".plt");
965 BFD_ASSERT (s != NULL);
967 /* The first entry in .plt is reserved. */
968 if (s->_raw_size == 0)
969 s->_raw_size = PLT_FIRST_ENTRY_SIZE;
971 /* If this symbol is not defined in a regular file, and we are
972 not generating a shared library, then set the symbol to this
973 location in the .plt. This is required to make function
974 pointers compare as equal between the normal executable and
975 the shared library. */
977 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
979 h->root.u.def.section = s;
980 h->root.u.def.value = s->_raw_size;
983 h->plt.offset = s->_raw_size;
985 /* Make room for this entry. */
986 s->_raw_size += PLT_ENTRY_SIZE;
988 /* We also need to make an entry in the .got.plt section, which
989 will be placed in the .got section by the linker script. */
990 s = bfd_get_section_by_name (dynobj, ".got.plt");
991 BFD_ASSERT (s != NULL);
992 s->_raw_size += GOT_ENTRY_SIZE;
994 /* We also need to make an entry in the .rela.plt section. */
995 s = bfd_get_section_by_name (dynobj, ".rela.plt");
996 BFD_ASSERT (s != NULL);
997 s->_raw_size += sizeof (Elf32_External_Rela);
1002 /* If this is a weak symbol, and there is a real definition, the
1003 processor independent code will have arranged for us to see the
1004 real definition first, and we can just use the same value. */
1005 if (h->weakdef != NULL)
1007 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1008 || h->weakdef->root.type == bfd_link_hash_defweak);
1009 h->root.u.def.section = h->weakdef->root.u.def.section;
1010 h->root.u.def.value = h->weakdef->root.u.def.value;
1014 /* This is a reference to a symbol defined by a dynamic object which
1015 is not a function. */
1017 /* If we are creating a shared library, we must presume that the
1018 only references to the symbol are via the global offset table.
1019 For such cases we need not do anything here; the relocations will
1020 be handled correctly by relocate_section. */
1024 /* If there are no references to this symbol that do not use the
1025 GOT, we don't need to generate a copy reloc. */
1026 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1029 /* We must allocate the symbol in our .dynbss section, which will
1030 become part of the .bss section of the executable. There will be
1031 an entry for this symbol in the .dynsym section. The dynamic
1032 object will contain position independent code, so all references
1033 from the dynamic object to this symbol will go through the global
1034 offset table. The dynamic linker will use the .dynsym entry to
1035 determine the address it must put in the global offset table, so
1036 both the dynamic object and the regular object will refer to the
1037 same memory location for the variable. */
1039 s = bfd_get_section_by_name (dynobj, ".dynbss");
1040 BFD_ASSERT (s != NULL);
1042 /* We must generate a R_390_COPY reloc to tell the dynamic linker
1043 to copy the initial value out of the dynamic object and into the
1044 runtime process image. We need to remember the offset into the
1045 .rel.bss section we are going to use. */
1046 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1050 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1051 BFD_ASSERT (srel != NULL);
1052 srel->_raw_size += sizeof (Elf32_External_Rela);
1053 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1056 /* We need to figure out the alignment required for this symbol. I
1057 have no idea how ELF linkers handle this. */
1058 power_of_two = bfd_log2 (h->size);
1059 if (power_of_two > 3)
1062 /* Apply the required alignment. */
1063 s->_raw_size = BFD_ALIGN (s->_raw_size,
1064 (bfd_size_type) (1 << power_of_two));
1065 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1067 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
1071 /* Define the symbol as being at this point in the section. */
1072 h->root.u.def.section = s;
1073 h->root.u.def.value = s->_raw_size;
1075 /* Increment the section size to make room for the symbol. */
1076 s->_raw_size += h->size;
1081 /* Set the sizes of the dynamic sections. */
1084 elf_s390_size_dynamic_sections (output_bfd, info)
1085 bfd *output_bfd ATTRIBUTE_UNUSED;
1086 struct bfd_link_info *info;
1093 dynobj = elf_hash_table (info)->dynobj;
1094 BFD_ASSERT (dynobj != NULL);
1096 if (elf_hash_table (info)->dynamic_sections_created)
1098 /* Set the contents of the .interp section to the interpreter. */
1101 s = bfd_get_section_by_name (dynobj, ".interp");
1102 BFD_ASSERT (s != NULL);
1103 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1104 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1109 /* We may have created entries in the .rela.got section.
1110 However, if we are not creating the dynamic sections, we will
1111 not actually use these entries. Reset the size of .rela.got,
1112 which will cause it to get stripped from the output file
1114 s = bfd_get_section_by_name (dynobj, ".rela.got");
1119 /* If this is a -Bsymbolic shared link, then we need to discard all
1120 PC relative relocs against symbols defined in a regular object.
1121 We allocated space for them in the check_relocs routine, but we
1122 will not fill them in in the relocate_section routine. */
1124 elf_s390_link_hash_traverse (elf_s390_hash_table (info),
1125 elf_s390_discard_copies,
1128 /* The check_relocs and adjust_dynamic_symbol entry points have
1129 determined the sizes of the various dynamic sections. Allocate
1133 for (s = dynobj->sections; s != NULL; s = s->next)
1138 if ((s->flags & SEC_LINKER_CREATED) == 0)
1141 /* It's OK to base decisions on the section name, because none
1142 of the dynobj section names depend upon the input files. */
1143 name = bfd_get_section_name (dynobj, s);
1147 if (strcmp (name, ".plt") == 0)
1149 if (s->_raw_size == 0)
1151 /* Strip this section if we don't need it; see the
1157 /* Remember whether there is a PLT. */
1161 else if (strncmp (name, ".rela", 5) == 0)
1163 if (s->_raw_size == 0)
1165 /* If we don't need this section, strip it from the
1166 output file. This is to handle .rela.bss and
1167 .rel.plt. We must create it in
1168 create_dynamic_sections, because it must be created
1169 before the linker maps input sections to output
1170 sections. The linker does that before
1171 adjust_dynamic_symbol is called, and it is that
1172 function which decides whether anything needs to go
1173 into these sections. */
1178 /* Remember whether there are any reloc sections other
1180 if (strcmp (name, ".rela.plt") != 0)
1183 /* We use the reloc_count field as a counter if we need
1184 to copy relocs into the output file. */
1188 else if (strncmp (name, ".got", 4) != 0)
1190 /* It's not one of our sections, so don't allocate space. */
1196 _bfd_strip_section_from_output (info, s);
1200 /* Allocate memory for the section contents. */
1201 s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size);
1202 if (s->contents == NULL && s->_raw_size != 0)
1206 if (elf_hash_table (info)->dynamic_sections_created)
1208 /* Add some entries to the .dynamic section. We fill in the
1209 values later, in elf_s390_finish_dynamic_sections, but we
1210 must add the entries now so that we get the correct size for
1211 the .dynamic section. The DT_DEBUG entry is filled in by the
1212 dynamic linker and used by the debugger. */
1213 #define add_dynamic_entry(TAG, VAL) \
1214 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1218 if (!add_dynamic_entry (DT_DEBUG, 0))
1224 if (!add_dynamic_entry (DT_PLTGOT, 0)
1225 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1226 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1227 || !add_dynamic_entry (DT_JMPREL, 0))
1233 if (!add_dynamic_entry (DT_RELA, 0)
1234 || !add_dynamic_entry (DT_RELASZ, 0)
1235 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
1239 if ((info->flags & DF_TEXTREL) != 0)
1241 if (!add_dynamic_entry (DT_TEXTREL, 0))
1243 info->flags |= DF_TEXTREL;
1246 #undef add_dynamic_entry
1251 /* This function is called via elf_s390_link_hash_traverse if we are
1252 creating a shared object with -Bsymbolic. It discards the space
1253 allocated to copy PC relative relocs against symbols which are
1254 defined in regular objects. We allocated space for them in the
1255 check_relocs routine, but we won't fill them in in the
1256 relocate_section routine. */
1260 elf_s390_discard_copies (h, inf)
1261 struct elf_s390_link_hash_entry *h;
1264 struct elf_s390_pcrel_relocs_copied *s;
1265 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1267 /* If a symbol has been forced local or we have found a regular
1268 definition for the symbolic link case, then we won't be needing
1270 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1271 && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
1274 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1275 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1279 /* Relocate a 390 ELF section. */
1282 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
1283 contents, relocs, local_syms, local_sections)
1285 struct bfd_link_info *info;
1287 asection *input_section;
1289 Elf_Internal_Rela *relocs;
1290 Elf_Internal_Sym *local_syms;
1291 asection **local_sections;
1294 Elf_Internal_Shdr *symtab_hdr;
1295 struct elf_link_hash_entry **sym_hashes;
1296 bfd_vma *local_got_offsets;
1300 Elf_Internal_Rela *rel;
1301 Elf_Internal_Rela *relend;
1303 dynobj = elf_hash_table (info)->dynobj;
1304 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1305 sym_hashes = elf_sym_hashes (input_bfd);
1306 local_got_offsets = elf_local_got_offsets (input_bfd);
1313 splt = bfd_get_section_by_name (dynobj, ".plt");
1314 sgot = bfd_get_section_by_name (dynobj, ".got");
1318 relend = relocs + input_section->reloc_count;
1319 for (; rel < relend; rel++)
1322 reloc_howto_type *howto;
1323 unsigned long r_symndx;
1324 struct elf_link_hash_entry *h;
1325 Elf_Internal_Sym *sym;
1328 bfd_reloc_status_type r;
1330 r_type = ELF32_R_TYPE (rel->r_info);
1331 if (r_type == (int) R_390_GNU_VTINHERIT
1332 || r_type == (int) R_390_GNU_VTENTRY)
1334 if (r_type < 0 || r_type >= (int) R_390_max)
1336 bfd_set_error (bfd_error_bad_value);
1339 howto = elf_howto_table + r_type;
1341 r_symndx = ELF32_R_SYM (rel->r_info);
1343 if (info->relocateable)
1345 /* This is a relocateable link. We don't have to change
1346 anything, unless the reloc is against a section symbol,
1347 in which case we have to adjust according to where the
1348 section symbol winds up in the output section. */
1349 if (r_symndx < symtab_hdr->sh_info)
1351 sym = local_syms + r_symndx;
1352 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1354 sec = local_sections[r_symndx];
1355 rel->r_addend += sec->output_offset + sym->st_value;
1362 /* This is a final link. */
1366 if (r_symndx < symtab_hdr->sh_info)
1368 sym = local_syms + r_symndx;
1369 sec = local_sections[r_symndx];
1370 relocation = (sec->output_section->vma
1371 + sec->output_offset
1376 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1377 while (h->root.type == bfd_link_hash_indirect
1378 || h->root.type == bfd_link_hash_warning)
1379 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1380 if (h->root.type == bfd_link_hash_defined
1381 || h->root.type == bfd_link_hash_defweak)
1383 sec = h->root.u.def.section;
1384 if (r_type == R_390_GOTPC
1385 || ((r_type == R_390_PLT16DBL ||
1386 r_type == R_390_PLT32)
1388 && h->plt.offset != (bfd_vma) -1)
1389 || ((r_type == R_390_GOT12 ||
1390 r_type == R_390_GOT16 ||
1391 r_type == R_390_GOT32)
1392 && elf_hash_table (info)->dynamic_sections_created
1394 || (! info->symbolic && h->dynindx != -1)
1395 || (h->elf_link_hash_flags
1396 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1398 && ((! info->symbolic && h->dynindx != -1)
1399 || (h->elf_link_hash_flags
1400 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1401 && ( r_type == R_390_8 ||
1402 r_type == R_390_16 ||
1403 r_type == R_390_32 ||
1404 r_type == R_390_PC16 ||
1405 r_type == R_390_PC16DBL ||
1406 r_type == R_390_PC32)
1407 && ((input_section->flags & SEC_ALLOC) != 0
1408 /* DWARF will emit R_386_32 relocations in its
1409 sections against symbols defined externally
1410 in shared libraries. We can't do anything
1412 || ((input_section->flags & SEC_DEBUGGING) != 0
1413 && (h->elf_link_hash_flags
1414 & ELF_LINK_HASH_DEF_DYNAMIC) != 0))))
1416 /* In these cases, we don't need the relocation
1417 value. We check specially because in some
1418 obscure cases sec->output_section will be NULL. */
1421 else if (sec->output_section == NULL)
1423 (*_bfd_error_handler)
1424 (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
1425 bfd_archive_filename (input_bfd), h->root.root.string,
1426 bfd_get_section_name (input_bfd, input_section));
1430 relocation = (h->root.u.def.value
1431 + sec->output_section->vma
1432 + sec->output_offset);
1434 else if (h->root.type == bfd_link_hash_undefweak)
1436 else if (info->shared
1437 && (!info->symbolic || info->allow_shlib_undefined)
1438 && !info->no_undefined
1439 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1443 if (! ((*info->callbacks->undefined_symbol)
1444 (info, h->root.root.string, input_bfd,
1445 input_section, rel->r_offset,
1446 (!info->shared || info->no_undefined
1447 || ELF_ST_VISIBILITY (h->other)))))
1458 /* Relocation is to the entry for this symbol in the global
1460 BFD_ASSERT (sgot != NULL);
1466 off = h->got.offset;
1467 BFD_ASSERT (off != (bfd_vma) -1);
1469 if (! elf_hash_table (info)->dynamic_sections_created
1471 && (info->symbolic || h->dynindx == -1)
1472 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1474 /* This is actually a static link, or it is a
1475 -Bsymbolic link and the symbol is defined
1476 locally, or the symbol was forced to be local
1477 because of a version file. We must initialize
1478 this entry in the global offset table. Since the
1479 offset must always be a multiple of 2, we use the
1480 least significant bit to record whether we have
1481 initialized it already.
1483 When doing a dynamic link, we create a .rel.got
1484 relocation entry to initialize the value. This
1485 is done in the finish_dynamic_symbol routine. */
1490 bfd_put_32 (output_bfd, relocation,
1491 sgot->contents + off);
1495 relocation = sgot->output_offset + off;
1501 BFD_ASSERT (local_got_offsets != NULL
1502 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1504 off = local_got_offsets[r_symndx];
1506 /* The offset must always be a multiple of 4. We use
1507 the least significant bit to record whether we have
1508 already generated the necessary reloc. */
1513 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1518 Elf_Internal_Rela outrel;
1520 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1521 BFD_ASSERT (srelgot != NULL);
1523 outrel.r_offset = (sgot->output_section->vma
1524 + sgot->output_offset
1526 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
1527 outrel.r_addend = relocation;
1528 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1529 (((Elf32_External_Rela *)
1531 + srelgot->reloc_count));
1532 ++srelgot->reloc_count;
1535 local_got_offsets[r_symndx] |= 1;
1538 relocation = sgot->output_offset + off;
1545 /* Relocation is relative to the start of the global offset
1550 sgot = bfd_get_section_by_name (dynobj, ".got");
1551 BFD_ASSERT (sgot != NULL);
1554 /* Note that sgot->output_offset is not involved in this
1555 calculation. We always want the start of .got. If we
1556 defined _GLOBAL_OFFSET_TABLE in a different way, as is
1557 permitted by the ABI, we might have to change this
1559 relocation -= sgot->output_section->vma;
1564 /* Use global offset table as symbol value. */
1568 sgot = bfd_get_section_by_name (dynobj, ".got");
1569 BFD_ASSERT (sgot != NULL);
1572 relocation = sgot->output_section->vma;
1576 case R_390_PLT16DBL:
1578 /* Relocation is to the entry for this symbol in the
1579 procedure linkage table. */
1581 /* Resolve a PLT32 reloc against a local symbol directly,
1582 without using the procedure linkage table. */
1586 if (h->plt.offset == (bfd_vma) -1 || splt == NULL)
1588 /* We didn't make a PLT entry for this symbol. This
1589 happens when statically linking PIC code, or when
1590 using -Bsymbolic. */
1594 relocation = (splt->output_section->vma
1595 + splt->output_offset
1607 && (input_section->flags & SEC_ALLOC) != 0
1608 && ((r_type != R_390_PC16 &&
1609 r_type != R_390_PC16DBL &&
1610 r_type != R_390_PC32)
1613 && (! info->symbolic
1614 || (h->elf_link_hash_flags
1615 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1617 Elf_Internal_Rela outrel;
1618 boolean skip, relocate;
1620 /* When generating a shared object, these relocations
1621 are copied into the output file to be resolved at run
1628 name = (bfd_elf_string_from_elf_section
1630 elf_elfheader (input_bfd)->e_shstrndx,
1631 elf_section_data (input_section)->rel_hdr.sh_name));
1635 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1636 && strcmp (bfd_get_section_name (input_bfd,
1640 sreloc = bfd_get_section_by_name (dynobj, name);
1641 BFD_ASSERT (sreloc != NULL);
1646 if (elf_section_data (input_section)->stab_info == NULL)
1647 outrel.r_offset = rel->r_offset;
1652 off = (_bfd_stab_section_offset
1653 (output_bfd, &elf_hash_table (info)->stab_info,
1655 &elf_section_data (input_section)->stab_info,
1657 if (off == (bfd_vma) -1)
1659 outrel.r_offset = off;
1662 outrel.r_offset += (input_section->output_section->vma
1663 + input_section->output_offset);
1667 memset (&outrel, 0, sizeof outrel);
1670 else if (r_type == R_390_PC16 ||
1671 r_type == R_390_PC16DBL ||
1672 r_type == R_390_PC32)
1674 BFD_ASSERT (h != NULL && h->dynindx != -1);
1676 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1677 outrel.r_addend = relocation + rel->r_addend;
1681 /* h->dynindx may be -1 if this symbol was marked to
1684 || ((info->symbolic || h->dynindx == -1)
1685 && (h->elf_link_hash_flags
1686 & ELF_LINK_HASH_DEF_REGULAR) != 0))
1689 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
1690 outrel.r_addend = relocation + rel->r_addend;
1694 BFD_ASSERT (h->dynindx != -1);
1696 outrel.r_info = ELF32_R_INFO (h->dynindx, R_390_32);
1697 outrel.r_addend = relocation + rel->r_addend;
1701 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1702 (((Elf32_External_Rela *)
1704 + sreloc->reloc_count));
1705 ++sreloc->reloc_count;
1707 /* If this reloc is against an external symbol, we do
1708 not want to fiddle with the addend. Otherwise, we
1709 need to include the symbol value so that it becomes
1710 an addend for the dynamic reloc. */
1721 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1722 contents, rel->r_offset,
1723 relocation, rel->r_addend);
1725 if (r != bfd_reloc_ok)
1730 case bfd_reloc_outofrange:
1732 case bfd_reloc_overflow:
1737 name = h->root.root.string;
1740 name = bfd_elf_string_from_elf_section (input_bfd,
1741 symtab_hdr->sh_link,
1746 name = bfd_section_name (input_bfd, sec);
1748 if (! ((*info->callbacks->reloc_overflow)
1749 (info, name, howto->name, (bfd_vma) 0,
1750 input_bfd, input_section, rel->r_offset)))
1761 /* Finish up dynamic symbol handling. We set the contents of various
1762 dynamic sections here. */
1765 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
1767 struct bfd_link_info *info;
1768 struct elf_link_hash_entry *h;
1769 Elf_Internal_Sym *sym;
1773 dynobj = elf_hash_table (info)->dynobj;
1775 if (h->plt.offset != (bfd_vma) -1)
1779 Elf_Internal_Rela rela;
1780 bfd_vma relative_offset;
1785 /* This symbol has an entry in the procedure linkage table. Set
1788 BFD_ASSERT (h->dynindx != -1);
1790 splt = bfd_get_section_by_name (dynobj, ".plt");
1791 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1792 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1793 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1796 Current offset - size first entry / entry size. */
1797 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
1799 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
1801 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
1803 /* S390 uses halfwords for relative branch calc! */
1804 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
1805 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
1806 /* If offset is > 32768, branch to a previous branch
1807 390 can only handle +-64 K jumps. */
1808 if ( -32768 > (int) relative_offset )
1810 -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
1812 /* Fill in the entry in the procedure linkage table. */
1815 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
1816 splt->contents + h->plt.offset);
1817 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
1818 splt->contents + h->plt.offset + 4);
1819 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
1820 splt->contents + h->plt.offset + 8);
1821 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
1822 splt->contents + h->plt.offset + 12);
1823 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
1824 splt->contents + h->plt.offset + 16);
1825 bfd_put_32 (output_bfd, (bfd_vma) 0 + (relative_offset << 16),
1826 splt->contents + h->plt.offset + 20);
1827 bfd_put_32 (output_bfd,
1828 (sgot->output_section->vma
1829 + sgot->output_offset
1831 splt->contents + h->plt.offset + 24);
1833 else if (got_offset < 4096)
1835 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD0 + got_offset,
1836 splt->contents + h->plt.offset);
1837 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD1,
1838 splt->contents + h->plt.offset + 4);
1839 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD2,
1840 splt->contents + h->plt.offset + 8);
1841 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD3,
1842 splt->contents + h->plt.offset + 12);
1843 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD4,
1844 splt->contents + h->plt.offset + 16);
1845 bfd_put_32 (output_bfd, (bfd_vma) 0 + (relative_offset << 16),
1846 splt->contents + h->plt.offset + 20);
1847 bfd_put_32 (output_bfd, (bfd_vma) 0,
1848 splt->contents + h->plt.offset + 24);
1850 else if (got_offset < 32768)
1852 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD0 + got_offset,
1853 splt->contents + h->plt.offset);
1854 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD1,
1855 splt->contents + h->plt.offset + 4);
1856 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD2,
1857 splt->contents + h->plt.offset + 8);
1858 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD3,
1859 splt->contents + h->plt.offset + 12);
1860 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD4,
1861 splt->contents + h->plt.offset + 16);
1862 bfd_put_32 (output_bfd, (bfd_vma) 0 + (relative_offset << 16),
1863 splt->contents + h->plt.offset + 20);
1864 bfd_put_32 (output_bfd, (bfd_vma) 0,
1865 splt->contents + h->plt.offset + 24);
1869 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD0,
1870 splt->contents + h->plt.offset);
1871 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD1,
1872 splt->contents + h->plt.offset + 4);
1873 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD2,
1874 splt->contents + h->plt.offset + 8);
1875 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD3,
1876 splt->contents + h->plt.offset + 12);
1877 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD4,
1878 splt->contents + h->plt.offset + 16);
1879 bfd_put_32 (output_bfd, (bfd_vma) 0 + (relative_offset << 16),
1880 splt->contents + h->plt.offset + 20);
1881 bfd_put_32 (output_bfd, got_offset,
1882 splt->contents + h->plt.offset + 24);
1884 /* Insert offset into reloc. table here. */
1885 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1886 splt->contents + h->plt.offset + 28);
1887 /* Fill in the entry in the .rela.plt section. */
1888 rela.r_offset = (sgot->output_section->vma
1889 + sgot->output_offset
1891 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
1893 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1894 ((Elf32_External_Rela *) srela->contents
1897 /* Fill in the entry in the global offset table.
1898 Points to instruction after GOT offset. */
1899 bfd_put_32 (output_bfd,
1900 (splt->output_section->vma
1901 + splt->output_offset
1904 sgot->contents + got_offset);
1907 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1909 /* Mark the symbol as undefined, rather than as defined in
1910 the .plt section. Leave the value alone. */
1911 sym->st_shndx = SHN_UNDEF;
1915 if (h->got.offset != (bfd_vma) -1)
1919 Elf_Internal_Rela rela;
1921 /* This symbol has an entry in the global offset table. Set it
1924 sgot = bfd_get_section_by_name (dynobj, ".got");
1925 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1926 BFD_ASSERT (sgot != NULL && srela != NULL);
1928 rela.r_offset = (sgot->output_section->vma
1929 + sgot->output_offset
1930 + (h->got.offset &~ (bfd_vma) 1));
1932 /* If this is a static link, or it is a -Bsymbolic link and the
1933 symbol is defined locally or was forced to be local because
1934 of a version file, we just want to emit a RELATIVE reloc.
1935 The entry in the global offset table will already have been
1936 initialized in the relocate_section function. */
1937 if (! elf_hash_table (info)->dynamic_sections_created
1939 && (info->symbolic || h->dynindx == -1)
1940 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1942 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
1943 rela.r_addend = (h->root.u.def.value
1944 + h->root.u.def.section->output_section->vma
1945 + h->root.u.def.section->output_offset);
1949 BFD_ASSERT((h->got.offset & 1) == 0);
1950 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
1951 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
1955 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1956 ((Elf32_External_Rela *) srela->contents
1957 + srela->reloc_count));
1958 ++srela->reloc_count;
1961 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1964 Elf_Internal_Rela rela;
1966 /* This symbols needs a copy reloc. Set it up. */
1968 BFD_ASSERT (h->dynindx != -1
1969 && (h->root.type == bfd_link_hash_defined
1970 || h->root.type == bfd_link_hash_defweak));
1973 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1975 BFD_ASSERT (s != NULL);
1977 rela.r_offset = (h->root.u.def.value
1978 + h->root.u.def.section->output_section->vma
1979 + h->root.u.def.section->output_offset);
1980 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
1982 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1983 ((Elf32_External_Rela *) s->contents
1988 /* Mark some specially defined symbols as absolute. */
1989 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1990 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
1991 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
1992 sym->st_shndx = SHN_ABS;
1997 /* Finish up the dynamic sections. */
2000 elf_s390_finish_dynamic_sections (output_bfd, info)
2002 struct bfd_link_info *info;
2008 dynobj = elf_hash_table (info)->dynobj;
2010 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2011 BFD_ASSERT (sgot != NULL);
2012 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2014 if (elf_hash_table (info)->dynamic_sections_created)
2017 Elf32_External_Dyn *dyncon, *dynconend;
2019 BFD_ASSERT (sdyn != NULL);
2021 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2022 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2023 for (; dyncon < dynconend; dyncon++)
2025 Elf_Internal_Dyn dyn;
2029 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2042 s = bfd_get_section_by_name(output_bfd, name);
2043 BFD_ASSERT (s != NULL);
2044 dyn.d_un.d_ptr = s->vma;
2045 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2049 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2050 BFD_ASSERT (s != NULL);
2051 if (s->_cooked_size != 0)
2052 dyn.d_un.d_val = s->_cooked_size;
2054 dyn.d_un.d_val = s->_raw_size;
2055 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2060 /* Fill in the special first entry in the procedure linkage table. */
2061 splt = bfd_get_section_by_name (dynobj, ".plt");
2062 if (splt && splt->_raw_size > 0)
2064 memset (splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
2067 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD0,
2069 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD1,
2070 splt->contents + 4 );
2071 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD2,
2072 splt->contents + 8 );
2073 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD3,
2074 splt->contents + 12 );
2075 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD4,
2076 splt->contents + 16 );
2080 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0,
2082 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
2083 splt->contents + 4 );
2084 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD2,
2085 splt->contents + 8 );
2086 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
2087 splt->contents + 12 );
2088 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
2089 splt->contents + 16 );
2090 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
2091 splt->contents + 20 );
2092 bfd_put_32 (output_bfd,
2093 sgot->output_section->vma + sgot->output_offset,
2094 splt->contents + 24);
2096 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4;
2101 /* Set the first entry in the global offset table to the address of
2102 the dynamic section. */
2103 if (sgot->_raw_size > 0)
2106 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2108 bfd_put_32 (output_bfd,
2109 sdyn->output_section->vma + sdyn->output_offset,
2112 /* One entry for shared object struct ptr. */
2113 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2114 /* One entry for _dl_runtime_resolve. */
2115 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2118 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2124 elf_s390_object_p (abfd)
2127 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_esa);
2130 static enum elf_reloc_type_class
2131 elf_s390_reloc_type_class (rela)
2132 const Elf_Internal_Rela *rela;
2134 switch ((int) ELF32_R_TYPE (rela->r_info))
2136 case R_390_RELATIVE:
2137 return reloc_class_relative;
2138 case R_390_JMP_SLOT:
2139 return reloc_class_plt;
2141 return reloc_class_copy;
2143 return reloc_class_normal;
2147 #define TARGET_BIG_SYM bfd_elf32_s390_vec
2148 #define TARGET_BIG_NAME "elf32-s390"
2149 #define ELF_ARCH bfd_arch_s390
2150 #define ELF_MACHINE_CODE EM_S390
2151 #define ELF_MACHINE_ALT1 EM_S390_OLD
2152 #define ELF_MAXPAGESIZE 0x1000
2154 #define elf_backend_can_gc_sections 1
2155 #define elf_backend_can_refcount 1
2156 #define elf_backend_want_got_plt 1
2157 #define elf_backend_plt_readonly 1
2158 #define elf_backend_want_plt_sym 0
2159 #define elf_backend_got_header_size 12
2160 #define elf_backend_plt_header_size PLT_ENTRY_SIZE
2162 #define elf_info_to_howto elf_s390_info_to_howto
2164 #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2165 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
2166 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
2167 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
2169 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
2170 #define elf_backend_check_relocs elf_s390_check_relocs
2171 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
2172 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
2173 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
2174 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
2175 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
2176 #define elf_backend_relocate_section elf_s390_relocate_section
2177 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
2178 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
2180 #define elf_backend_object_p elf_s390_object_p
2182 #include "elf32-target.h"