daily update
[binutils.git] / bfd / elf64-s390.c
blob296e349320070c6aa2130652c29cd0a7da2159e2
1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
3 Contributed Martin Schwidefsky (schwidefsky@de.ibm.com).
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
20 02111-1307, USA. */
22 #include "bfd.h"
23 #include "sysdep.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
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
33 PARAMS ((bfd *, const char *));
34 static struct bfd_hash_entry *link_hash_newfunc
35 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
36 static struct bfd_link_hash_table *elf_s390_link_hash_table_create
37 PARAMS ((bfd *));
38 static boolean create_got_section
39 PARAMS((bfd *, struct bfd_link_info *));
40 static boolean elf_s390_create_dynamic_sections
41 PARAMS((bfd *, struct bfd_link_info *));
42 static void elf_s390_copy_indirect_symbol
43 PARAMS ((struct elf_backend_data *, struct elf_link_hash_entry *,
44 struct elf_link_hash_entry *));
45 static boolean elf_s390_check_relocs
46 PARAMS ((bfd *, struct bfd_link_info *, asection *,
47 const Elf_Internal_Rela *));
48 static asection *elf_s390_gc_mark_hook
49 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
50 struct elf_link_hash_entry *, Elf_Internal_Sym *));
51 static boolean elf_s390_gc_sweep_hook
52 PARAMS ((bfd *, struct bfd_link_info *, asection *,
53 const Elf_Internal_Rela *));
54 static boolean elf_s390_adjust_dynamic_symbol
55 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
56 static boolean allocate_dynrelocs
57 PARAMS ((struct elf_link_hash_entry *, PTR));
58 static boolean readonly_dynrelocs
59 PARAMS ((struct elf_link_hash_entry *, PTR));
60 static boolean elf_s390_size_dynamic_sections
61 PARAMS ((bfd *, struct bfd_link_info *));
62 static boolean elf_s390_relocate_section
63 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
64 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
65 static boolean elf_s390_finish_dynamic_symbol
66 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
67 Elf_Internal_Sym *));
68 static enum elf_reloc_type_class elf_s390_reloc_type_class
69 PARAMS ((const Elf_Internal_Rela *));
70 static boolean elf_s390_finish_dynamic_sections
71 PARAMS ((bfd *, struct bfd_link_info *));
72 static boolean elf_s390_object_p PARAMS ((bfd *));
74 #include "elf/s390.h"
76 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
77 from smaller values. Start with zero, widen, *then* decrement. */
78 #define MINUS_ONE (((bfd_vma)0) - 1)
80 /* The relocation "howto" table. */
81 static reloc_howto_type elf_howto_table[] =
83 HOWTO (R_390_NONE, /* type */
84 0, /* rightshift */
85 0, /* size (0 = byte, 1 = short, 2 = long) */
86 0, /* bitsize */
87 false, /* pc_relative */
88 0, /* bitpos */
89 complain_overflow_dont, /* complain_on_overflow */
90 bfd_elf_generic_reloc, /* special_function */
91 "R_390_NONE", /* name */
92 false, /* partial_inplace */
93 0, /* src_mask */
94 0, /* dst_mask */
95 false), /* pcrel_offset */
97 HOWTO(R_390_8, 0, 0, 8, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false),
98 HOWTO(R_390_12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false),
99 HOWTO(R_390_16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false),
100 HOWTO(R_390_32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false),
101 HOWTO(R_390_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true),
102 HOWTO(R_390_GOT12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false),
103 HOWTO(R_390_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false),
104 HOWTO(R_390_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true),
105 HOWTO(R_390_COPY, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_COPY", false, 0,MINUS_ONE, false),
106 HOWTO(R_390_GLOB_DAT, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GLOB_DAT",false, 0,MINUS_ONE, false),
107 HOWTO(R_390_JMP_SLOT, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_JMP_SLOT",false, 0,MINUS_ONE, false),
108 HOWTO(R_390_RELATIVE, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_RELATIVE",false, 0,MINUS_ONE, false),
109 HOWTO(R_390_GOTOFF, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTOFF", false, 0,MINUS_ONE, false),
110 HOWTO(R_390_GOTPC, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,MINUS_ONE, true),
111 HOWTO(R_390_GOT16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false),
112 HOWTO(R_390_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true),
113 HOWTO(R_390_PC16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true),
114 HOWTO(R_390_PLT16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true),
115 HOWTO(R_390_PC32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true),
116 HOWTO(R_390_PLT32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true),
117 HOWTO(R_390_GOTPCDBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPCDBL", false, 0,MINUS_ONE, true),
118 HOWTO(R_390_64, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_64", false, 0,MINUS_ONE, false),
119 HOWTO(R_390_PC64, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC64", false, 0,MINUS_ONE, true),
120 HOWTO(R_390_GOT64, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT64", false, 0,MINUS_ONE, false),
121 HOWTO(R_390_PLT64, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT64", false, 0,MINUS_ONE, true),
122 HOWTO(R_390_GOTENT, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTENT", false, 0,MINUS_ONE, true),
125 /* GNU extension to record C++ vtable hierarchy. */
126 static reloc_howto_type elf64_s390_vtinherit_howto =
127 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false);
128 static reloc_howto_type elf64_s390_vtentry_howto =
129 HOWTO (R_390_GNU_VTENTRY, 0,4,0,false,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", false,0,0, false);
131 static reloc_howto_type *
132 elf_s390_reloc_type_lookup (abfd, code)
133 bfd *abfd ATTRIBUTE_UNUSED;
134 bfd_reloc_code_real_type code;
136 switch (code)
138 case BFD_RELOC_NONE:
139 return &elf_howto_table[(int) R_390_NONE];
140 case BFD_RELOC_8:
141 return &elf_howto_table[(int) R_390_8];
142 case BFD_RELOC_390_12:
143 return &elf_howto_table[(int) R_390_12];
144 case BFD_RELOC_16:
145 return &elf_howto_table[(int) R_390_16];
146 case BFD_RELOC_32:
147 return &elf_howto_table[(int) R_390_32];
148 case BFD_RELOC_CTOR:
149 return &elf_howto_table[(int) R_390_32];
150 case BFD_RELOC_32_PCREL:
151 return &elf_howto_table[(int) R_390_PC32];
152 case BFD_RELOC_390_GOT12:
153 return &elf_howto_table[(int) R_390_GOT12];
154 case BFD_RELOC_32_GOT_PCREL:
155 return &elf_howto_table[(int) R_390_GOT32];
156 case BFD_RELOC_390_PLT32:
157 return &elf_howto_table[(int) R_390_PLT32];
158 case BFD_RELOC_390_COPY:
159 return &elf_howto_table[(int) R_390_COPY];
160 case BFD_RELOC_390_GLOB_DAT:
161 return &elf_howto_table[(int) R_390_GLOB_DAT];
162 case BFD_RELOC_390_JMP_SLOT:
163 return &elf_howto_table[(int) R_390_JMP_SLOT];
164 case BFD_RELOC_390_RELATIVE:
165 return &elf_howto_table[(int) R_390_RELATIVE];
166 case BFD_RELOC_32_GOTOFF:
167 return &elf_howto_table[(int) R_390_GOTOFF];
168 case BFD_RELOC_390_GOTPC:
169 return &elf_howto_table[(int) R_390_GOTPC];
170 case BFD_RELOC_390_GOT16:
171 return &elf_howto_table[(int) R_390_GOT16];
172 case BFD_RELOC_16_PCREL:
173 return &elf_howto_table[(int) R_390_PC16];
174 case BFD_RELOC_390_PC16DBL:
175 return &elf_howto_table[(int) R_390_PC16DBL];
176 case BFD_RELOC_390_PLT16DBL:
177 return &elf_howto_table[(int) R_390_PLT16DBL];
178 case BFD_RELOC_VTABLE_INHERIT:
179 return &elf64_s390_vtinherit_howto;
180 case BFD_RELOC_VTABLE_ENTRY:
181 return &elf64_s390_vtentry_howto;
182 case BFD_RELOC_390_PC32DBL:
183 return &elf_howto_table[(int) R_390_PC32DBL];
184 case BFD_RELOC_390_PLT32DBL:
185 return &elf_howto_table[(int) R_390_PLT32DBL];
186 case BFD_RELOC_390_GOTPCDBL:
187 return &elf_howto_table[(int) R_390_GOTPCDBL];
188 case BFD_RELOC_64:
189 return &elf_howto_table[(int) R_390_64];
190 case BFD_RELOC_64_PCREL:
191 return &elf_howto_table[(int) R_390_PC64];
192 case BFD_RELOC_390_GOT64:
193 return &elf_howto_table[(int) R_390_GOT64];
194 case BFD_RELOC_390_PLT64:
195 return &elf_howto_table[(int) R_390_PLT64];
196 case BFD_RELOC_390_GOTENT:
197 return &elf_howto_table[(int) R_390_GOTENT];
198 default:
199 break;
201 return 0;
204 /* We need to use ELF64_R_TYPE so we have our own copy of this function,
205 and elf64-s390.c has its own copy. */
207 static void
208 elf_s390_info_to_howto (abfd, cache_ptr, dst)
209 bfd *abfd ATTRIBUTE_UNUSED;
210 arelent *cache_ptr;
211 Elf_Internal_Rela *dst;
213 switch (ELF64_R_TYPE(dst->r_info))
215 case R_390_GNU_VTINHERIT:
216 cache_ptr->howto = &elf64_s390_vtinherit_howto;
217 break;
219 case R_390_GNU_VTENTRY:
220 cache_ptr->howto = &elf64_s390_vtentry_howto;
221 break;
223 default:
224 BFD_ASSERT (ELF64_R_TYPE(dst->r_info) < (unsigned int) R_390_max);
225 cache_ptr->howto = &elf_howto_table[ELF64_R_TYPE(dst->r_info)];
229 static boolean
230 elf_s390_is_local_label_name (abfd, name)
231 bfd *abfd;
232 const char *name;
234 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
235 return true;
237 return _bfd_elf_is_local_label_name (abfd, name);
240 /* Functions for the 390 ELF linker. */
242 /* The name of the dynamic interpreter. This is put in the .interp
243 section. */
245 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
247 /* The size in bytes of the first entry in the procedure linkage table. */
248 #define PLT_FIRST_ENTRY_SIZE 32
249 /* The size in bytes of an entry in the procedure linkage table. */
250 #define PLT_ENTRY_SIZE 32
252 #define GOT_ENTRY_SIZE 8
254 /* The first three entries in a procedure linkage table are reserved,
255 and the initial contents are unimportant (we zero them out).
256 Subsequent entries look like this. See the SVR4 ABI 386
257 supplement to see how this works. */
259 /* For the s390, simple addr offset can only be 0 - 4096.
260 To use the full 16777216 TB address space, several instructions
261 are needed to load an address in a register and execute
262 a branch( or just saving the address)
264 Furthermore, only r 0 and 1 are free to use!!! */
266 /* The first 3 words in the GOT are then reserved.
267 Word 0 is the address of the dynamic table.
268 Word 1 is a pointer to a structure describing the object
269 Word 2 is used to point to the loader entry address.
271 The code for PLT entries looks like this:
273 The GOT holds the address in the PLT to be executed.
274 The loader then gets:
275 24(15) = Pointer to the structure describing the object.
276 28(15) = Offset in symbol table
277 The loader must then find the module where the function is
278 and insert the address in the GOT.
280 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
281 LG 1,0(1) # 6 bytes Load address from GOT in r1
282 BCR 15,1 # 2 bytes Jump to address
283 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
284 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1
285 BRCL 15,-x # 6 bytes Jump to start of PLT
286 .long ? # 4 bytes offset into symbol table
288 Total = 32 bytes per PLT entry
289 Fixup at offset 2: relative address to GOT entry
290 Fixup at offset 22: relative branch to PLT0
291 Fixup at offset 28: 32 bit offset into symbol table
293 A 32 bit offset into the symbol table is enough. It allows for symbol
294 tables up to a size of 2 gigabyte. A single dynamic object (the main
295 program, any shared library) is limited to 4GB in size and I want to see
296 the program that manages to have a symbol table of more than 2 GB with a
297 total size of at max 4 GB. */
299 #define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000
300 #define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310
301 #define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004
302 #define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10
303 #define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c
304 #define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4
305 #define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000
306 #define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000
308 /* The first PLT entry pushes the offset into the symbol table
309 from R1 onto the stack at 8(15) and the loader object info
310 at 12(15), loads the loader address in R1 and jumps to it. */
312 /* The first entry in the PLT:
314 PLT0:
315 STG 1,56(15) # r1 contains the offset into the symbol table
316 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
317 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
318 LG 1,16(1) # get entry address of loader
319 BCR 15,1 # jump to loader
321 Fixup at offset 8: relative address to start of GOT. */
323 #define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038
324 #define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010
325 #define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000
326 #define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030
327 #define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310
328 #define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004
329 #define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700
330 #define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700
332 /* The s390 linker needs to keep track of the number of relocs that it
333 decides to copy as dynamic relocs in check_relocs for each symbol.
334 This is so that it can later discard them if they are found to be
335 unnecessary. We store the information in a field extending the
336 regular ELF linker hash table. */
338 struct elf_s390_dyn_relocs
340 struct elf_s390_dyn_relocs *next;
342 /* The input section of the reloc. */
343 asection *sec;
345 /* Total number of relocs copied for the input section. */
346 bfd_size_type count;
348 /* Number of pc-relative relocs copied for the input section. */
349 bfd_size_type pc_count;
352 /* s390 ELF linker hash entry. */
354 struct elf_s390_link_hash_entry
356 struct elf_link_hash_entry elf;
358 /* Track dynamic relocs copied for this symbol. */
359 struct elf_s390_dyn_relocs *dyn_relocs;
362 /* s390 ELF linker hash table. */
364 struct elf_s390_link_hash_table
366 struct elf_link_hash_table elf;
368 /* Short-cuts to get to dynamic linker sections. */
369 asection *sgot;
370 asection *sgotplt;
371 asection *srelgot;
372 asection *splt;
373 asection *srelplt;
374 asection *sdynbss;
375 asection *srelbss;
377 /* Small local sym to section mapping cache. */
378 struct sym_sec_cache sym_sec;
381 /* Get the s390 ELF linker hash table from a link_info structure. */
383 #define elf_s390_hash_table(p) \
384 ((struct elf_s390_link_hash_table *) ((p)->hash))
386 /* Create an entry in an s390 ELF linker hash table. */
388 static struct bfd_hash_entry *
389 link_hash_newfunc (entry, table, string)
390 struct bfd_hash_entry *entry;
391 struct bfd_hash_table *table;
392 const char *string;
394 /* Allocate the structure if it has not already been allocated by a
395 subclass. */
396 if (entry == NULL)
398 entry = bfd_hash_allocate (table,
399 sizeof (struct elf_s390_link_hash_entry));
400 if (entry == NULL)
401 return entry;
404 /* Call the allocation method of the superclass. */
405 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
406 if (entry != NULL)
408 struct elf_s390_link_hash_entry *eh;
410 eh = (struct elf_s390_link_hash_entry *) entry;
411 eh->dyn_relocs = NULL;
414 return entry;
417 /* Create an s390 ELF linker hash table. */
419 static struct bfd_link_hash_table *
420 elf_s390_link_hash_table_create (abfd)
421 bfd *abfd;
423 struct elf_s390_link_hash_table *ret;
424 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
426 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
427 if (ret == NULL)
428 return NULL;
430 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
432 free (ret);
433 return NULL;
436 ret->sgot = NULL;
437 ret->sgotplt = NULL;
438 ret->srelgot = NULL;
439 ret->splt = NULL;
440 ret->srelplt = NULL;
441 ret->sdynbss = NULL;
442 ret->srelbss = NULL;
443 ret->sym_sec.abfd = NULL;
445 return &ret->elf.root;
448 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
449 shortcuts to them in our hash table. */
451 static boolean
452 create_got_section (dynobj, info)
453 bfd *dynobj;
454 struct bfd_link_info *info;
456 struct elf_s390_link_hash_table *htab;
458 if (! _bfd_elf_create_got_section (dynobj, info))
459 return false;
461 htab = elf_s390_hash_table (info);
462 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
463 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
464 if (!htab->sgot || !htab->sgotplt)
465 abort ();
467 htab->srelgot = bfd_make_section (dynobj, ".rela.got");
468 if (htab->srelgot == NULL
469 || ! bfd_set_section_flags (dynobj, htab->srelgot,
470 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
471 | SEC_IN_MEMORY | SEC_LINKER_CREATED
472 | SEC_READONLY))
473 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3))
474 return false;
475 return true;
478 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
479 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
480 hash table. */
482 static boolean
483 elf_s390_create_dynamic_sections (dynobj, info)
484 bfd *dynobj;
485 struct bfd_link_info *info;
487 struct elf_s390_link_hash_table *htab;
489 htab = elf_s390_hash_table (info);
490 if (!htab->sgot && !create_got_section (dynobj, info))
491 return false;
493 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
494 return false;
496 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
497 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
498 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
499 if (!info->shared)
500 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
502 if (!htab->splt || !htab->srelplt || !htab->sdynbss
503 || (!info->shared && !htab->srelbss))
504 abort ();
506 return true;
509 /* Copy the extra info we tack onto an elf_link_hash_entry. */
511 static void
512 elf_s390_copy_indirect_symbol (bed, dir, ind)
513 struct elf_backend_data *bed;
514 struct elf_link_hash_entry *dir, *ind;
516 struct elf_s390_link_hash_entry *edir, *eind;
518 edir = (struct elf_s390_link_hash_entry *) dir;
519 eind = (struct elf_s390_link_hash_entry *) ind;
521 if (eind->dyn_relocs != NULL)
523 if (edir->dyn_relocs != NULL)
525 struct elf_s390_dyn_relocs **pp;
526 struct elf_s390_dyn_relocs *p;
528 if (ind->root.type == bfd_link_hash_indirect)
529 abort ();
531 /* Add reloc counts against the weak sym to the strong sym
532 list. Merge any entries against the same section. */
533 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
535 struct elf_s390_dyn_relocs *q;
537 for (q = edir->dyn_relocs; q != NULL; q = q->next)
538 if (q->sec == p->sec)
540 q->pc_count += p->pc_count;
541 q->count += p->count;
542 *pp = p->next;
543 break;
545 if (q == NULL)
546 pp = &p->next;
548 *pp = edir->dyn_relocs;
551 edir->dyn_relocs = eind->dyn_relocs;
552 eind->dyn_relocs = NULL;
555 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
558 /* Look through the relocs for a section during the first phase, and
559 allocate space in the global offset table or procedure linkage
560 table. */
562 static boolean
563 elf_s390_check_relocs (abfd, info, sec, relocs)
564 bfd *abfd;
565 struct bfd_link_info *info;
566 asection *sec;
567 const Elf_Internal_Rela *relocs;
569 struct elf_s390_link_hash_table *htab;
570 Elf_Internal_Shdr *symtab_hdr;
571 struct elf_link_hash_entry **sym_hashes;
572 const Elf_Internal_Rela *rel;
573 const Elf_Internal_Rela *rel_end;
574 asection *sreloc;
576 if (info->relocateable)
577 return true;
579 htab = elf_s390_hash_table (info);
580 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
581 sym_hashes = elf_sym_hashes (abfd);
583 sreloc = NULL;
585 rel_end = relocs + sec->reloc_count;
586 for (rel = relocs; rel < rel_end; rel++)
588 unsigned long r_symndx;
589 struct elf_link_hash_entry *h;
591 r_symndx = ELF64_R_SYM (rel->r_info);
593 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
595 (*_bfd_error_handler) (_("%s: bad symbol index: %d"),
596 bfd_archive_filename (abfd),
597 r_symndx);
598 return false;
601 if (r_symndx < symtab_hdr->sh_info)
602 h = NULL;
603 else
604 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
606 switch (ELF64_R_TYPE (rel->r_info))
608 case R_390_GOT12:
609 case R_390_GOT16:
610 case R_390_GOT32:
611 case R_390_GOT64:
612 case R_390_GOTENT:
613 /* This symbol requires a global offset table entry. */
614 if (h != NULL)
616 h->got.refcount += 1;
618 else
620 bfd_signed_vma *local_got_refcounts;
622 /* This is a global offset table entry for a local symbol. */
623 local_got_refcounts = elf_local_got_refcounts (abfd);
624 if (local_got_refcounts == NULL)
626 bfd_size_type size;
628 size = symtab_hdr->sh_info;
629 size *= sizeof (bfd_signed_vma);
630 local_got_refcounts = ((bfd_signed_vma *)
631 bfd_zalloc (abfd, size));
632 if (local_got_refcounts == NULL)
633 return false;
634 elf_local_got_refcounts (abfd) = local_got_refcounts;
636 local_got_refcounts[r_symndx] += 1;
638 /* Fall through */
640 case R_390_GOTOFF:
641 case R_390_GOTPC:
642 case R_390_GOTPCDBL:
643 if (htab->sgot == NULL)
645 if (htab->elf.dynobj == NULL)
646 htab->elf.dynobj = abfd;
647 if (!create_got_section (htab->elf.dynobj, info))
648 return false;
650 break;
652 case R_390_PLT16DBL:
653 case R_390_PLT32:
654 case R_390_PLT32DBL:
655 case R_390_PLT64:
656 /* This symbol requires a procedure linkage table entry. We
657 actually build the entry in adjust_dynamic_symbol,
658 because this might be a case of linking PIC code which is
659 never referenced by a dynamic object, in which case we
660 don't need to generate a procedure linkage table entry
661 after all. */
663 /* If this is a local symbol, we resolve it directly without
664 creating a procedure linkage table entry. */
665 if (h == NULL)
666 continue;
668 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
669 h->plt.refcount += 1;
670 break;
672 case R_390_8:
673 case R_390_16:
674 case R_390_32:
675 case R_390_64:
676 case R_390_PC16:
677 case R_390_PC16DBL:
678 case R_390_PC32:
679 case R_390_PC32DBL:
680 case R_390_PC64:
681 if (h != NULL && !info->shared)
683 /* If this reloc is in a read-only section, we might
684 need a copy reloc. We can't check reliably at this
685 stage whether the section is read-only, as input
686 sections have not yet been mapped to output sections.
687 Tentatively set the flag for now, and correct in
688 adjust_dynamic_symbol. */
689 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
691 /* We may need a .plt entry if the function this reloc
692 refers to is in a shared lib. */
693 h->plt.refcount += 1;
696 /* If we are creating a shared library, and this is a reloc
697 against a global symbol, or a non PC relative reloc
698 against a local symbol, then we need to copy the reloc
699 into the shared library. However, if we are linking with
700 -Bsymbolic, we do not need to copy a reloc against a
701 global symbol which is defined in an object we are
702 including in the link (i.e., DEF_REGULAR is set). At
703 this point we have not seen all the input files, so it is
704 possible that DEF_REGULAR is not set now but will be set
705 later (it is never cleared). In case of a weak definition,
706 DEF_REGULAR may be cleared later by a strong definition in
707 a shared library. We account for that possibility below by
708 storing information in the relocs_copied field of the hash
709 table entry. A similar situation occurs when creating
710 shared libraries and symbol visibility changes render the
711 symbol local.
713 If on the other hand, we are creating an executable, we
714 may need to keep relocations for symbols satisfied by a
715 dynamic library if we manage to avoid copy relocs for the
716 symbol. */
717 if ((info->shared
718 && (sec->flags & SEC_ALLOC) != 0
719 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
720 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
721 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
722 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
723 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
724 || (h != NULL
725 && (! info->symbolic
726 || h->root.type == bfd_link_hash_defweak
727 || (h->elf_link_hash_flags
728 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
729 || (!info->shared
730 && (sec->flags & SEC_ALLOC) != 0
731 && h != NULL
732 && (h->root.type == bfd_link_hash_defweak
733 || (h->elf_link_hash_flags
734 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
736 struct elf_s390_dyn_relocs *p;
737 struct elf_s390_dyn_relocs **head;
739 /* We must copy these reloc types into the output file.
740 Create a reloc section in dynobj and make room for
741 this reloc. */
742 if (sreloc == NULL)
744 const char *name;
745 bfd *dynobj;
747 name = (bfd_elf_string_from_elf_section
748 (abfd,
749 elf_elfheader (abfd)->e_shstrndx,
750 elf_section_data (sec)->rel_hdr.sh_name));
751 if (name == NULL)
752 return false;
754 if (strncmp (name, ".rela", 5) != 0
755 || strcmp (bfd_get_section_name (abfd, sec),
756 name + 5) != 0)
758 (*_bfd_error_handler)
759 (_("%s: bad relocation section name `%s\'"),
760 bfd_archive_filename (abfd), name);
763 if (htab->elf.dynobj == NULL)
764 htab->elf.dynobj = abfd;
766 dynobj = htab->elf.dynobj;
767 sreloc = bfd_get_section_by_name (dynobj, name);
768 if (sreloc == NULL)
770 flagword flags;
772 sreloc = bfd_make_section (dynobj, name);
773 flags = (SEC_HAS_CONTENTS | SEC_READONLY
774 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
775 if ((sec->flags & SEC_ALLOC) != 0)
776 flags |= SEC_ALLOC | SEC_LOAD;
777 if (sreloc == NULL
778 || ! bfd_set_section_flags (dynobj, sreloc, flags)
779 || ! bfd_set_section_alignment (dynobj, sreloc, 3))
780 return false;
782 elf_section_data (sec)->sreloc = sreloc;
785 /* If this is a global symbol, we count the number of
786 relocations we need for this symbol. */
787 if (h != NULL)
789 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
791 else
793 /* Track dynamic relocs needed for local syms too.
794 We really need local syms available to do this
795 easily. Oh well. */
797 asection *s;
798 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
799 sec, r_symndx);
800 if (s == NULL)
801 return false;
803 head = ((struct elf_s390_dyn_relocs **)
804 &elf_section_data (s)->local_dynrel);
807 p = *head;
808 if (p == NULL || p->sec != sec)
810 bfd_size_type amt = sizeof *p;
811 p = ((struct elf_s390_dyn_relocs *)
812 bfd_alloc (htab->elf.dynobj, amt));
813 if (p == NULL)
814 return false;
815 p->next = *head;
816 *head = p;
817 p->sec = sec;
818 p->count = 0;
819 p->pc_count = 0;
822 p->count += 1;
823 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
824 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
825 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
826 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
827 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
828 p->pc_count += 1;
830 break;
832 /* This relocation describes the C++ object vtable hierarchy.
833 Reconstruct it for later use during GC. */
834 case R_390_GNU_VTINHERIT:
835 if (!_bfd_elf64_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
836 return false;
837 break;
839 /* This relocation describes which C++ vtable entries are actually
840 used. Record for later use during GC. */
841 case R_390_GNU_VTENTRY:
842 if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend))
843 return false;
844 break;
846 default:
847 break;
851 return true;
854 /* Return the section that should be marked against GC for a given
855 relocation. */
857 static asection *
858 elf_s390_gc_mark_hook (sec, info, rel, h, sym)
859 asection *sec;
860 struct bfd_link_info *info ATTRIBUTE_UNUSED;
861 Elf_Internal_Rela *rel;
862 struct elf_link_hash_entry *h;
863 Elf_Internal_Sym *sym;
865 if (h != NULL)
867 switch (ELF64_R_TYPE (rel->r_info))
869 case R_390_GNU_VTINHERIT:
870 case R_390_GNU_VTENTRY:
871 break;
873 default:
874 switch (h->root.type)
876 case bfd_link_hash_defined:
877 case bfd_link_hash_defweak:
878 return h->root.u.def.section;
880 case bfd_link_hash_common:
881 return h->root.u.c.p->section;
883 default:
884 break;
888 else
889 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
891 return NULL;
894 /* Update the got entry reference counts for the section being removed. */
896 static boolean
897 elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
898 bfd *abfd;
899 struct bfd_link_info *info;
900 asection *sec;
901 const Elf_Internal_Rela *relocs;
903 Elf_Internal_Shdr *symtab_hdr;
904 struct elf_link_hash_entry **sym_hashes;
905 bfd_signed_vma *local_got_refcounts;
906 const Elf_Internal_Rela *rel, *relend;
907 unsigned long r_symndx;
908 struct elf_link_hash_entry *h;
910 elf_section_data (sec)->local_dynrel = NULL;
912 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
913 sym_hashes = elf_sym_hashes (abfd);
914 local_got_refcounts = elf_local_got_refcounts (abfd);
916 relend = relocs + sec->reloc_count;
917 for (rel = relocs; rel < relend; rel++)
918 switch (ELF64_R_TYPE (rel->r_info))
920 case R_390_GOT12:
921 case R_390_GOT16:
922 case R_390_GOT32:
923 case R_390_GOT64:
924 case R_390_GOTOFF:
925 case R_390_GOTPC:
926 case R_390_GOTPCDBL:
927 case R_390_GOTENT:
928 r_symndx = ELF64_R_SYM (rel->r_info);
929 if (r_symndx >= symtab_hdr->sh_info)
931 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
932 if (h->got.refcount > 0)
933 h->got.refcount -= 1;
935 else if (local_got_refcounts != NULL)
937 if (local_got_refcounts[r_symndx] > 0)
938 local_got_refcounts[r_symndx] -= 1;
940 break;
942 case R_390_8:
943 case R_390_12:
944 case R_390_16:
945 case R_390_32:
946 case R_390_64:
947 case R_390_PC16:
948 case R_390_PC16DBL:
949 case R_390_PC32:
950 case R_390_PC32DBL:
951 case R_390_PC64:
952 r_symndx = ELF64_R_SYM (rel->r_info);
953 if (r_symndx >= symtab_hdr->sh_info)
955 struct elf_s390_link_hash_entry *eh;
956 struct elf_s390_dyn_relocs **pp;
957 struct elf_s390_dyn_relocs *p;
959 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
961 if (!info->shared && h->plt.refcount > 0)
962 h->plt.refcount -= 1;
964 eh = (struct elf_s390_link_hash_entry *) h;
966 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
967 if (p->sec == sec)
969 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
970 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
971 || ELF64_R_TYPE (rel->r_info) == R_390_PC32)
972 p->pc_count -= 1;
973 p->count -= 1;
974 if (p->count == 0)
975 *pp = p->next;
976 break;
979 break;
981 case R_390_PLT16DBL:
982 case R_390_PLT32:
983 case R_390_PLT32DBL:
984 case R_390_PLT64:
985 r_symndx = ELF64_R_SYM (rel->r_info);
986 if (r_symndx >= symtab_hdr->sh_info)
988 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
989 if (h->plt.refcount > 0)
990 h->plt.refcount -= 1;
992 break;
994 default:
995 break;
998 return true;
1001 /* Adjust a symbol defined by a dynamic object and referenced by a
1002 regular object. The current definition is in some section of the
1003 dynamic object, but we're not including those sections. We have to
1004 change the definition to something the rest of the link can
1005 understand. */
1007 static boolean
1008 elf_s390_adjust_dynamic_symbol (info, h)
1009 struct bfd_link_info *info;
1010 struct elf_link_hash_entry *h;
1012 struct elf_s390_link_hash_table *htab;
1013 struct elf_s390_link_hash_entry * eh;
1014 struct elf_s390_dyn_relocs *p;
1015 asection *s;
1016 unsigned int power_of_two;
1018 /* If this is a function, put it in the procedure linkage table. We
1019 will fill in the contents of the procedure linkage table later
1020 (although we could actually do it here). */
1021 if (h->type == STT_FUNC
1022 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
1024 if (h->plt.refcount <= 0
1025 || (! info->shared
1026 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
1027 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
1028 && h->root.type != bfd_link_hash_undefweak
1029 && h->root.type != bfd_link_hash_undefined))
1031 /* This case can occur if we saw a PLT32 reloc in an input
1032 file, but the symbol was never referred to by a dynamic
1033 object, or if all references were garbage collected. In
1034 such a case, we don't actually need to build a procedure
1035 linkage table, and we can just do a PC32 reloc instead. */
1036 h->plt.offset = (bfd_vma) -1;
1037 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1040 return true;
1042 else
1043 /* It's possible that we incorrectly decided a .plt reloc was
1044 needed for an R_390_PC32 reloc to a non-function sym in
1045 check_relocs. We can't decide accurately between function and
1046 non-function syms in check-relocs; Objects loaded later in
1047 the link may change h->type. So fix it now. */
1048 h->plt.offset = (bfd_vma) -1;
1050 /* If this is a weak symbol, and there is a real definition, the
1051 processor independent code will have arranged for us to see the
1052 real definition first, and we can just use the same value. */
1053 if (h->weakdef != NULL)
1055 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1056 || h->weakdef->root.type == bfd_link_hash_defweak);
1057 h->root.u.def.section = h->weakdef->root.u.def.section;
1058 h->root.u.def.value = h->weakdef->root.u.def.value;
1059 return true;
1062 /* This is a reference to a symbol defined by a dynamic object which
1063 is not a function. */
1065 /* If we are creating a shared library, we must presume that the
1066 only references to the symbol are via the global offset table.
1067 For such cases we need not do anything here; the relocations will
1068 be handled correctly by relocate_section. */
1069 if (info->shared)
1070 return true;
1072 /* If there are no references to this symbol that do not use the
1073 GOT, we don't need to generate a copy reloc. */
1074 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1075 return true;
1077 /* If -z nocopyreloc was given, we won't generate them either. */
1078 if (info->nocopyreloc)
1080 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1081 return true;
1084 eh = (struct elf_s390_link_hash_entry *) h;
1085 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1087 s = p->sec->output_section;
1088 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1089 break;
1092 /* If we didn't find any dynamic relocs in read-only sections, then
1093 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1094 if (p == NULL)
1096 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1097 return true;
1100 /* We must allocate the symbol in our .dynbss section, which will
1101 become part of the .bss section of the executable. There will be
1102 an entry for this symbol in the .dynsym section. The dynamic
1103 object will contain position independent code, so all references
1104 from the dynamic object to this symbol will go through the global
1105 offset table. The dynamic linker will use the .dynsym entry to
1106 determine the address it must put in the global offset table, so
1107 both the dynamic object and the regular object will refer to the
1108 same memory location for the variable. */
1110 htab = elf_s390_hash_table (info);
1112 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1113 copy the initial value out of the dynamic object and into the
1114 runtime process image. */
1115 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1117 htab->srelbss->_raw_size += sizeof (Elf64_External_Rela);
1118 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1121 /* We need to figure out the alignment required for this symbol. I
1122 have no idea how ELF linkers handle this. */
1123 power_of_two = bfd_log2 (h->size);
1124 if (power_of_two > 3)
1125 power_of_two = 3;
1127 /* Apply the required alignment. */
1128 s = htab->sdynbss;
1129 s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
1130 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1132 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1133 return false;
1136 /* Define the symbol as being at this point in the section. */
1137 h->root.u.def.section = s;
1138 h->root.u.def.value = s->_raw_size;
1140 /* Increment the section size to make room for the symbol. */
1141 s->_raw_size += h->size;
1143 return true;
1146 /* This is the condition under which elf_s390_finish_dynamic_symbol
1147 will be called from elflink.h. If elflink.h doesn't call our
1148 finish_dynamic_symbol routine, we'll need to do something about
1149 initializing any .plt and .got entries in elf_s390_relocate_section. */
1150 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \
1151 ((DYN) \
1152 && ((INFO)->shared \
1153 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1154 && ((H)->dynindx != -1 \
1155 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1157 /* Allocate space in .plt, .got and associated reloc sections for
1158 dynamic relocs. */
1160 static boolean
1161 allocate_dynrelocs (h, inf)
1162 struct elf_link_hash_entry *h;
1163 PTR inf;
1165 struct bfd_link_info *info;
1166 struct elf_s390_link_hash_table *htab;
1167 struct elf_s390_link_hash_entry *eh;
1168 struct elf_s390_dyn_relocs *p;
1170 if (h->root.type == bfd_link_hash_indirect)
1171 return true;
1173 if (h->root.type == bfd_link_hash_warning)
1174 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1176 info = (struct bfd_link_info *) inf;
1177 htab = elf_s390_hash_table (info);
1179 if (htab->elf.dynamic_sections_created
1180 && h->plt.refcount > 0)
1182 /* Make sure this symbol is output as a dynamic symbol.
1183 Undefined weak syms won't yet be marked as dynamic. */
1184 if (h->dynindx == -1
1185 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1187 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
1188 return false;
1191 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h))
1193 asection *s = htab->splt;
1195 /* If this is the first .plt entry, make room for the special
1196 first entry. */
1197 if (s->_raw_size == 0)
1198 s->_raw_size += PLT_FIRST_ENTRY_SIZE;
1200 h->plt.offset = s->_raw_size;
1202 /* If this symbol is not defined in a regular file, and we are
1203 not generating a shared library, then set the symbol to this
1204 location in the .plt. This is required to make function
1205 pointers compare as equal between the normal executable and
1206 the shared library. */
1207 if (! info->shared
1208 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1210 h->root.u.def.section = s;
1211 h->root.u.def.value = h->plt.offset;
1214 /* Make room for this entry. */
1215 s->_raw_size += PLT_ENTRY_SIZE;
1217 /* We also need to make an entry in the .got.plt section, which
1218 will be placed in the .got section by the linker script. */
1219 htab->sgotplt->_raw_size += GOT_ENTRY_SIZE;
1221 /* We also need to make an entry in the .rela.plt section. */
1222 htab->srelplt->_raw_size += sizeof (Elf64_External_Rela);
1224 else
1226 h->plt.offset = (bfd_vma) -1;
1227 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1230 else
1232 h->plt.offset = (bfd_vma) -1;
1233 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1236 if (h->got.refcount > 0)
1238 asection *s;
1239 boolean dyn;
1241 /* Make sure this symbol is output as a dynamic symbol.
1242 Undefined weak syms won't yet be marked as dynamic. */
1243 if (h->dynindx == -1
1244 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1246 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
1247 return false;
1250 s = htab->sgot;
1251 h->got.offset = s->_raw_size;
1252 s->_raw_size += GOT_ENTRY_SIZE;
1253 dyn = htab->elf.dynamic_sections_created;
1254 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h))
1255 htab->srelgot->_raw_size += sizeof (Elf64_External_Rela);
1257 else
1258 h->got.offset = (bfd_vma) -1;
1260 eh = (struct elf_s390_link_hash_entry *) h;
1261 if (eh->dyn_relocs == NULL)
1262 return true;
1264 /* In the shared -Bsymbolic case, discard space allocated for
1265 dynamic pc-relative relocs against symbols which turn out to be
1266 defined in regular objects. For the normal shared case, discard
1267 space for pc-relative relocs that have become local due to symbol
1268 visibility changes. */
1270 if (info->shared)
1272 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1273 && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
1274 || info->symbolic))
1276 struct elf_s390_dyn_relocs **pp;
1278 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1280 p->count -= p->pc_count;
1281 p->pc_count = 0;
1282 if (p->count == 0)
1283 *pp = p->next;
1284 else
1285 pp = &p->next;
1289 else
1291 /* For the non-shared case, discard space for relocs against
1292 symbols which turn out to need copy relocs or are not
1293 dynamic. */
1295 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1296 && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1297 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1298 || (htab->elf.dynamic_sections_created
1299 && (h->root.type == bfd_link_hash_undefweak
1300 || h->root.type == bfd_link_hash_undefined))))
1302 /* Make sure this symbol is output as a dynamic symbol.
1303 Undefined weak syms won't yet be marked as dynamic. */
1304 if (h->dynindx == -1
1305 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1307 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
1308 return false;
1311 /* If that succeeded, we know we'll be keeping all the
1312 relocs. */
1313 if (h->dynindx != -1)
1314 goto keep;
1317 eh->dyn_relocs = NULL;
1319 keep: ;
1322 /* Finally, allocate space. */
1323 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1325 asection *sreloc = elf_section_data (p->sec)->sreloc;
1326 sreloc->_raw_size += p->count * sizeof (Elf64_External_Rela);
1329 return true;
1332 /* Find any dynamic relocs that apply to read-only sections. */
1334 static boolean
1335 readonly_dynrelocs (h, inf)
1336 struct elf_link_hash_entry *h;
1337 PTR inf;
1339 struct elf_s390_link_hash_entry *eh;
1340 struct elf_s390_dyn_relocs *p;
1342 if (h->root.type == bfd_link_hash_warning)
1343 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1345 eh = (struct elf_s390_link_hash_entry *) h;
1346 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1348 asection *s = p->sec->output_section;
1350 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1352 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1354 info->flags |= DF_TEXTREL;
1356 /* Not an error, just cut short the traversal. */
1357 return false;
1360 return true;
1363 /* Set the sizes of the dynamic sections. */
1365 static boolean
1366 elf_s390_size_dynamic_sections (output_bfd, info)
1367 bfd *output_bfd ATTRIBUTE_UNUSED;
1368 struct bfd_link_info *info;
1370 struct elf_s390_link_hash_table *htab;
1371 bfd *dynobj;
1372 asection *s;
1373 boolean relocs;
1374 bfd *ibfd;
1376 htab = elf_s390_hash_table (info);
1377 dynobj = htab->elf.dynobj;
1378 if (dynobj == NULL)
1379 abort ();
1381 if (htab->elf.dynamic_sections_created)
1383 /* Set the contents of the .interp section to the interpreter. */
1384 if (! info->shared)
1386 s = bfd_get_section_by_name (dynobj, ".interp");
1387 if (s == NULL)
1388 abort ();
1389 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1390 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1394 /* Set up .got offsets for local syms, and space for local dynamic
1395 relocs. */
1396 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1398 bfd_signed_vma *local_got;
1399 bfd_signed_vma *end_local_got;
1400 bfd_size_type locsymcount;
1401 Elf_Internal_Shdr *symtab_hdr;
1402 asection *srela;
1404 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1405 continue;
1407 for (s = ibfd->sections; s != NULL; s = s->next)
1409 struct elf_s390_dyn_relocs *p;
1411 for (p = *((struct elf_s390_dyn_relocs **)
1412 &elf_section_data (s)->local_dynrel);
1413 p != NULL;
1414 p = p->next)
1416 if (!bfd_is_abs_section (p->sec)
1417 && bfd_is_abs_section (p->sec->output_section))
1419 /* Input section has been discarded, either because
1420 it is a copy of a linkonce section or due to
1421 linker script /DISCARD/, so we'll be discarding
1422 the relocs too. */
1424 else if (p->count != 0)
1426 srela = elf_section_data (p->sec)->sreloc;
1427 srela->_raw_size += p->count * sizeof (Elf64_External_Rela);
1428 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1429 info->flags |= DF_TEXTREL;
1434 local_got = elf_local_got_refcounts (ibfd);
1435 if (!local_got)
1436 continue;
1438 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1439 locsymcount = symtab_hdr->sh_info;
1440 end_local_got = local_got + locsymcount;
1441 s = htab->sgot;
1442 srela = htab->srelgot;
1443 for (; local_got < end_local_got; ++local_got)
1445 if (*local_got > 0)
1447 *local_got = s->_raw_size;
1448 s->_raw_size += GOT_ENTRY_SIZE;
1449 if (info->shared)
1450 srela->_raw_size += sizeof (Elf64_External_Rela);
1452 else
1453 *local_got = (bfd_vma) -1;
1457 /* Allocate global sym .plt and .got entries, and space for global
1458 sym dynamic relocs. */
1459 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1461 /* We now have determined the sizes of the various dynamic sections.
1462 Allocate memory for them. */
1463 relocs = false;
1464 for (s = dynobj->sections; s != NULL; s = s->next)
1466 if ((s->flags & SEC_LINKER_CREATED) == 0)
1467 continue;
1469 if (s == htab->splt
1470 || s == htab->sgot
1471 || s == htab->sgotplt)
1473 /* Strip this section if we don't need it; see the
1474 comment below. */
1476 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
1478 if (s->_raw_size != 0 && s != htab->srelplt)
1479 relocs = true;
1481 /* We use the reloc_count field as a counter if we need
1482 to copy relocs into the output file. */
1483 s->reloc_count = 0;
1485 else
1487 /* It's not one of our sections, so don't allocate space. */
1488 continue;
1491 if (s->_raw_size == 0)
1493 /* If we don't need this section, strip it from the
1494 output file. This is to handle .rela.bss and
1495 .rela.plt. We must create it in
1496 create_dynamic_sections, because it must be created
1497 before the linker maps input sections to output
1498 sections. The linker does that before
1499 adjust_dynamic_symbol is called, and it is that
1500 function which decides whether anything needs to go
1501 into these sections. */
1503 _bfd_strip_section_from_output (info, s);
1504 continue;
1507 /* Allocate memory for the section contents. We use bfd_zalloc
1508 here in case unused entries are not reclaimed before the
1509 section's contents are written out. This should not happen,
1510 but this way if it does, we get a R_390_NONE reloc instead
1511 of garbage. */
1512 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1513 if (s->contents == NULL)
1514 return false;
1517 if (htab->elf.dynamic_sections_created)
1519 /* Add some entries to the .dynamic section. We fill in the
1520 values later, in elf_s390_finish_dynamic_sections, but we
1521 must add the entries now so that we get the correct size for
1522 the .dynamic section. The DT_DEBUG entry is filled in by the
1523 dynamic linker and used by the debugger. */
1524 #define add_dynamic_entry(TAG, VAL) \
1525 bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1527 if (! info->shared)
1529 if (!add_dynamic_entry (DT_DEBUG, 0))
1530 return false;
1533 if (htab->splt->_raw_size != 0)
1535 if (!add_dynamic_entry (DT_PLTGOT, 0)
1536 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1537 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1538 || !add_dynamic_entry (DT_JMPREL, 0))
1539 return false;
1542 if (relocs)
1544 if (!add_dynamic_entry (DT_RELA, 0)
1545 || !add_dynamic_entry (DT_RELASZ, 0)
1546 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
1547 return false;
1549 /* If any dynamic relocs apply to a read-only section,
1550 then we need a DT_TEXTREL entry. */
1551 if ((info->flags & DF_TEXTREL) == 0)
1552 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
1553 (PTR) info);
1555 if ((info->flags & DF_TEXTREL) != 0)
1557 if (!add_dynamic_entry (DT_TEXTREL, 0))
1558 return false;
1562 #undef add_dynamic_entry
1564 return true;
1567 /* Relocate a 390 ELF section. */
1569 static boolean
1570 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
1571 contents, relocs, local_syms, local_sections)
1572 bfd *output_bfd;
1573 struct bfd_link_info *info;
1574 bfd *input_bfd;
1575 asection *input_section;
1576 bfd_byte *contents;
1577 Elf_Internal_Rela *relocs;
1578 Elf_Internal_Sym *local_syms;
1579 asection **local_sections;
1581 struct elf_s390_link_hash_table *htab;
1582 Elf_Internal_Shdr *symtab_hdr;
1583 struct elf_link_hash_entry **sym_hashes;
1584 bfd_vma *local_got_offsets;
1585 Elf_Internal_Rela *rel;
1586 Elf_Internal_Rela *relend;
1588 if (info->relocateable)
1589 return true;
1591 htab = elf_s390_hash_table (info);
1592 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1593 sym_hashes = elf_sym_hashes (input_bfd);
1594 local_got_offsets = elf_local_got_offsets (input_bfd);
1596 rel = relocs;
1597 relend = relocs + input_section->reloc_count;
1598 for (; rel < relend; rel++)
1600 int r_type;
1601 reloc_howto_type *howto;
1602 unsigned long r_symndx;
1603 struct elf_link_hash_entry *h;
1604 Elf_Internal_Sym *sym;
1605 asection *sec;
1606 bfd_vma off;
1607 bfd_vma relocation;
1608 boolean unresolved_reloc;
1609 bfd_reloc_status_type r;
1611 r_type = ELF64_R_TYPE (rel->r_info);
1612 if (r_type == (int) R_390_GNU_VTINHERIT
1613 || r_type == (int) R_390_GNU_VTENTRY)
1614 continue;
1615 if (r_type < 0 || r_type >= (int) R_390_max)
1617 bfd_set_error (bfd_error_bad_value);
1618 return false;
1621 howto = elf_howto_table + r_type;
1622 r_symndx = ELF64_R_SYM (rel->r_info);
1623 h = NULL;
1624 sym = NULL;
1625 sec = NULL;
1626 unresolved_reloc = false;
1627 if (r_symndx < symtab_hdr->sh_info)
1629 sym = local_syms + r_symndx;
1630 sec = local_sections[r_symndx];
1631 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
1633 else
1635 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1636 while (h->root.type == bfd_link_hash_indirect
1637 || h->root.type == bfd_link_hash_warning)
1638 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1640 if (h->root.type == bfd_link_hash_defined
1641 || h->root.type == bfd_link_hash_defweak)
1643 sec = h->root.u.def.section;
1644 if (sec->output_section == NULL)
1646 /* Set a flag that will be cleared later if we find a
1647 relocation value for this symbol. output_section
1648 is typically NULL for symbols satisfied by a shared
1649 library. */
1650 unresolved_reloc = true;
1651 relocation = 0;
1653 else
1654 relocation = (h->root.u.def.value
1655 + sec->output_section->vma
1656 + sec->output_offset);
1658 else if (h->root.type == bfd_link_hash_undefweak)
1659 relocation = 0;
1660 else if (info->shared
1661 && (!info->symbolic || info->allow_shlib_undefined)
1662 && !info->no_undefined
1663 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1664 relocation = 0;
1665 else
1667 if (! ((*info->callbacks->undefined_symbol)
1668 (info, h->root.root.string, input_bfd,
1669 input_section, rel->r_offset,
1670 (!info->shared || info->no_undefined
1671 || ELF_ST_VISIBILITY (h->other)))))
1672 return false;
1673 relocation = 0;
1677 switch (r_type)
1679 case R_390_GOT12:
1680 case R_390_GOT16:
1681 case R_390_GOT32:
1682 case R_390_GOT64:
1683 case R_390_GOTENT:
1684 /* Relocation is to the entry for this symbol in the global
1685 offset table. */
1686 if (htab->sgot == NULL)
1687 abort ();
1689 if (h != NULL)
1691 boolean dyn;
1693 off = h->got.offset;
1694 dyn = htab->elf.dynamic_sections_created;
1695 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)
1696 || (info->shared
1697 && (info->symbolic
1698 || h->dynindx == -1
1699 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
1700 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1702 /* This is actually a static link, or it is a
1703 -Bsymbolic link and the symbol is defined
1704 locally, or the symbol was forced to be local
1705 because of a version file. We must initialize
1706 this entry in the global offset table. Since the
1707 offset must always be a multiple of 2, we use the
1708 least significant bit to record whether we have
1709 initialized it already.
1711 When doing a dynamic link, we create a .rel.got
1712 relocation entry to initialize the value. This
1713 is done in the finish_dynamic_symbol routine. */
1714 if ((off & 1) != 0)
1715 off &= ~1;
1716 else
1718 bfd_put_64 (output_bfd, relocation,
1719 htab->sgot->contents + off);
1720 h->got.offset |= 1;
1723 else
1724 unresolved_reloc = false;
1726 else
1728 if (local_got_offsets == NULL)
1729 abort ();
1731 off = local_got_offsets[r_symndx];
1733 /* The offset must always be a multiple of 8. We use
1734 the least significant bit to record whether we have
1735 already generated the necessary reloc. */
1736 if ((off & 1) != 0)
1737 off &= ~1;
1738 else
1740 bfd_put_64 (output_bfd, relocation,
1741 htab->sgot->contents + off);
1743 if (info->shared)
1745 asection *srelgot;
1746 Elf_Internal_Rela outrel;
1747 Elf64_External_Rela *loc;
1749 srelgot = htab->srelgot;
1750 if (srelgot == NULL)
1751 abort ();
1753 outrel.r_offset = (htab->sgot->output_section->vma
1754 + htab->sgot->output_offset
1755 + off);
1756 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
1757 outrel.r_addend = relocation;
1758 loc = (Elf64_External_Rela *) srelgot->contents;
1759 loc += srelgot->reloc_count++;
1760 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
1763 local_got_offsets[r_symndx] |= 1;
1767 if (off >= (bfd_vma) -2)
1768 abort ();
1770 relocation = htab->sgot->output_offset + off;
1773 * For @GOTENT the relocation is against the offset between
1774 * the instruction and the symbols entry in the GOT and not
1775 * between the start of the GOT and the symbols entry. We
1776 * add the vma of the GOT to get the correct value.
1778 if (r_type == R_390_GOTENT)
1779 relocation += htab->sgot->output_section->vma;
1781 break;
1783 case R_390_GOTOFF:
1784 /* Relocation is relative to the start of the global offset
1785 table. */
1787 /* Note that sgot->output_offset is not involved in this
1788 calculation. We always want the start of .got. If we
1789 defined _GLOBAL_OFFSET_TABLE in a different way, as is
1790 permitted by the ABI, we might have to change this
1791 calculation. */
1792 relocation -= htab->sgot->output_section->vma;
1794 break;
1796 case R_390_GOTPC:
1797 case R_390_GOTPCDBL:
1798 /* Use global offset table as symbol value. */
1799 relocation = htab->sgot->output_section->vma;
1800 unresolved_reloc = false;
1801 break;
1803 case R_390_PLT16DBL:
1804 case R_390_PLT32:
1805 case R_390_PLT32DBL:
1806 case R_390_PLT64:
1807 /* Relocation is to the entry for this symbol in the
1808 procedure linkage table. */
1810 /* Resolve a PLT32 reloc against a local symbol directly,
1811 without using the procedure linkage table. */
1812 if (h == NULL)
1813 break;
1815 if (h->plt.offset == (bfd_vma) -1
1816 || htab->splt == NULL)
1818 /* We didn't make a PLT entry for this symbol. This
1819 happens when statically linking PIC code, or when
1820 using -Bsymbolic. */
1821 break;
1824 relocation = (htab->splt->output_section->vma
1825 + htab->splt->output_offset
1826 + h->plt.offset);
1827 unresolved_reloc = false;
1828 break;
1830 case R_390_8:
1831 case R_390_16:
1832 case R_390_32:
1833 case R_390_64:
1834 case R_390_PC16:
1835 case R_390_PC16DBL:
1836 case R_390_PC32:
1837 case R_390_PC32DBL:
1838 case R_390_PC64:
1839 /* r_symndx will be zero only for relocs against symbols
1840 from removed linkonce sections, or sections discarded by
1841 a linker script. */
1842 if (r_symndx == 0
1843 || (input_section->flags & SEC_ALLOC) == 0)
1844 break;
1846 if ((info->shared
1847 && ((r_type != R_390_PC16
1848 && r_type != R_390_PC16DBL
1849 && r_type != R_390_PC32
1850 && r_type != R_390_PC32DBL
1851 && r_type != R_390_PC64)
1852 || (h != NULL
1853 && h->dynindx != -1
1854 && (! info->symbolic
1855 || (h->elf_link_hash_flags
1856 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1857 || (!info->shared
1858 && h != NULL
1859 && h->dynindx != -1
1860 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1861 && (((h->elf_link_hash_flags
1862 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1863 && (h->elf_link_hash_flags
1864 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1865 || h->root.type == bfd_link_hash_undefweak
1866 || h->root.type == bfd_link_hash_undefined)))
1868 Elf_Internal_Rela outrel;
1869 boolean skip, relocate;
1870 asection *sreloc;
1871 Elf64_External_Rela *loc;
1873 /* When generating a shared object, these relocations
1874 are copied into the output file to be resolved at run
1875 time. */
1877 skip = false;
1878 relocate = false;
1880 outrel.r_offset =
1881 _bfd_elf_section_offset (output_bfd, info, input_section,
1882 rel->r_offset);
1883 if (outrel.r_offset == (bfd_vma) -1)
1884 skip = true;
1885 else if (outrel.r_offset == (bfd_vma) -2)
1886 skip = true, relocate = true;
1888 outrel.r_offset += (input_section->output_section->vma
1889 + input_section->output_offset);
1891 if (skip)
1892 memset (&outrel, 0, sizeof outrel);
1893 else if (h != NULL
1894 && h->dynindx != -1
1895 && (r_type == R_390_PC16
1896 || r_type == R_390_PC16DBL
1897 || r_type == R_390_PC32
1898 || r_type == R_390_PC32DBL
1899 || r_type == R_390_PC64
1900 || !info->shared
1901 || !info->symbolic
1902 || (h->elf_link_hash_flags
1903 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1905 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
1906 outrel.r_addend = rel->r_addend;
1908 else
1910 /* This symbol is local, or marked to become local. */
1911 relocate = true;
1912 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
1913 outrel.r_addend = relocation + rel->r_addend;
1916 sreloc = elf_section_data (input_section)->sreloc;
1917 if (sreloc == NULL)
1918 abort ();
1920 loc = (Elf64_External_Rela *) sreloc->contents;
1921 loc += sreloc->reloc_count++;
1922 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
1924 /* If this reloc is against an external symbol, we do
1925 not want to fiddle with the addend. Otherwise, we
1926 need to include the symbol value so that it becomes
1927 an addend for the dynamic reloc. */
1928 if (! relocate)
1929 continue;
1932 break;
1934 default:
1935 break;
1938 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
1939 because such sections are not SEC_ALLOC and thus ld.so will
1940 not process them. */
1941 if (unresolved_reloc
1942 && !((input_section->flags & SEC_DEBUGGING) != 0
1943 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
1944 (*_bfd_error_handler)
1945 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
1946 bfd_archive_filename (input_bfd),
1947 bfd_get_section_name (input_bfd, input_section),
1948 (long) rel->r_offset,
1949 h->root.root.string);
1951 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1952 contents, rel->r_offset,
1953 relocation, rel->r_addend);
1955 if (r != bfd_reloc_ok)
1957 const char *name;
1959 if (h != NULL)
1960 name = h->root.root.string;
1961 else
1963 name = bfd_elf_string_from_elf_section (input_bfd,
1964 symtab_hdr->sh_link,
1965 sym->st_name);
1966 if (name == NULL)
1967 return false;
1968 if (*name == '\0')
1969 name = bfd_section_name (input_bfd, sec);
1972 if (r == bfd_reloc_overflow)
1975 if (! ((*info->callbacks->reloc_overflow)
1976 (info, name, howto->name, (bfd_vma) 0,
1977 input_bfd, input_section, rel->r_offset)))
1978 return false;
1980 else
1982 (*_bfd_error_handler)
1983 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
1984 bfd_archive_filename (input_bfd),
1985 bfd_get_section_name (input_bfd, input_section),
1986 (long) rel->r_offset, name, (int) r);
1987 return false;
1992 return true;
1995 /* Finish up dynamic symbol handling. We set the contents of various
1996 dynamic sections here. */
1998 static boolean
1999 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
2000 bfd *output_bfd;
2001 struct bfd_link_info *info;
2002 struct elf_link_hash_entry *h;
2003 Elf_Internal_Sym *sym;
2005 struct elf_s390_link_hash_table *htab;
2007 htab = elf_s390_hash_table (info);
2009 if (h->plt.offset != (bfd_vma) -1)
2011 bfd_vma plt_index;
2012 bfd_vma got_offset;
2013 Elf_Internal_Rela rela;
2014 Elf64_External_Rela *loc;
2016 /* This symbol has an entry in the procedure linkage table. Set
2017 it up. */
2019 if (h->dynindx == -1
2020 || htab->splt == NULL
2021 || htab->sgotplt == NULL
2022 || htab->srelplt == NULL)
2023 abort ();
2025 /* Calc. index no.
2026 Current offset - size first entry / entry size. */
2027 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
2029 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
2030 addr & GOT addr. */
2031 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
2033 /* Fill in the blueprint of a PLT. */
2034 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
2035 htab->splt->contents + h->plt.offset);
2036 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
2037 htab->splt->contents + h->plt.offset + 4);
2038 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
2039 htab->splt->contents + h->plt.offset + 8);
2040 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
2041 htab->splt->contents + h->plt.offset + 12);
2042 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
2043 htab->splt->contents + h->plt.offset + 16);
2044 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5,
2045 htab->splt->contents + h->plt.offset + 20);
2046 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6,
2047 htab->splt->contents + h->plt.offset + 24);
2048 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7,
2049 htab->splt->contents + h->plt.offset + 28);
2050 /* Fixup the relative address to the GOT entry */
2051 bfd_put_32 (output_bfd,
2052 (htab->sgotplt->output_section->vma +
2053 htab->sgotplt->output_offset + got_offset
2054 - (htab->splt->output_section->vma + h->plt.offset))/2,
2055 htab->splt->contents + h->plt.offset + 2);
2056 /* Fixup the relative branch to PLT 0 */
2057 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
2058 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
2059 htab->splt->contents + h->plt.offset + 24);
2060 /* Fixup offset into symbol table */
2061 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
2062 htab->splt->contents + h->plt.offset + 28);
2064 /* Fill in the entry in the global offset table.
2065 Points to instruction after GOT offset. */
2066 bfd_put_64 (output_bfd,
2067 (htab->splt->output_section->vma
2068 + htab->splt->output_offset
2069 + h->plt.offset
2070 + 14),
2071 htab->sgotplt->contents + got_offset);
2073 /* Fill in the entry in the .rela.plt section. */
2074 rela.r_offset = (htab->sgotplt->output_section->vma
2075 + htab->sgotplt->output_offset
2076 + got_offset);
2077 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
2078 rela.r_addend = 0;
2079 loc = (Elf64_External_Rela *) htab->srelplt->contents + plt_index;
2080 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
2082 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2084 /* Mark the symbol as undefined, rather than as defined in
2085 the .plt section. Leave the value alone. This is a clue
2086 for the dynamic linker, to make function pointer
2087 comparisons work between an application and shared
2088 library. */
2089 sym->st_shndx = SHN_UNDEF;
2093 if (h->got.offset != (bfd_vma) -1)
2095 Elf_Internal_Rela rela;
2096 Elf64_External_Rela *loc;
2098 /* This symbol has an entry in the global offset table. Set it
2099 up. */
2101 if (htab->sgot == NULL || htab->srelgot == NULL)
2102 abort ();
2104 rela.r_offset = (htab->sgot->output_section->vma
2105 + htab->sgot->output_offset
2106 + (h->got.offset &~ (bfd_vma) 1));
2108 /* If this is a static link, or it is a -Bsymbolic link and the
2109 symbol is defined locally or was forced to be local because
2110 of a version file, we just want to emit a RELATIVE reloc.
2111 The entry in the global offset table will already have been
2112 initialized in the relocate_section function. */
2113 if (info->shared
2114 && (info->symbolic
2115 || h->dynindx == -1
2116 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
2117 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
2119 BFD_ASSERT((h->got.offset & 1) != 0);
2120 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2121 rela.r_addend = (h->root.u.def.value
2122 + h->root.u.def.section->output_section->vma
2123 + h->root.u.def.section->output_offset);
2125 else
2127 BFD_ASSERT((h->got.offset & 1) == 0);
2128 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
2129 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
2130 rela.r_addend = 0;
2133 loc = (Elf64_External_Rela *) htab->srelgot->contents;
2134 loc += htab->srelgot->reloc_count++;
2135 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
2138 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
2140 Elf_Internal_Rela rela;
2141 Elf64_External_Rela *loc;
2143 /* This symbols needs a copy reloc. Set it up. */
2145 if (h->dynindx == -1
2146 || (h->root.type != bfd_link_hash_defined
2147 && h->root.type != bfd_link_hash_defweak)
2148 || htab->srelbss == NULL)
2149 abort ();
2151 rela.r_offset = (h->root.u.def.value
2152 + h->root.u.def.section->output_section->vma
2153 + h->root.u.def.section->output_offset);
2154 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
2155 rela.r_addend = 0;
2156 loc = (Elf64_External_Rela *) htab->srelbss->contents;
2157 loc += htab->srelbss->reloc_count++;
2158 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
2161 /* Mark some specially defined symbols as absolute. */
2162 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2163 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
2164 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
2165 sym->st_shndx = SHN_ABS;
2167 return true;
2170 /* Used to decide how to sort relocs in an optimal manner for the
2171 dynamic linker, before writing them out. */
2173 static enum elf_reloc_type_class
2174 elf_s390_reloc_type_class (rela)
2175 const Elf_Internal_Rela *rela;
2177 switch ((int) ELF64_R_TYPE (rela->r_info))
2179 case R_390_RELATIVE:
2180 return reloc_class_relative;
2181 case R_390_JMP_SLOT:
2182 return reloc_class_plt;
2183 case R_390_COPY:
2184 return reloc_class_copy;
2185 default:
2186 return reloc_class_normal;
2190 /* Finish up the dynamic sections. */
2192 static boolean
2193 elf_s390_finish_dynamic_sections (output_bfd, info)
2194 bfd *output_bfd;
2195 struct bfd_link_info *info;
2197 struct elf_s390_link_hash_table *htab;
2198 bfd *dynobj;
2199 asection *sdyn;
2201 htab = elf_s390_hash_table (info);
2202 dynobj = htab->elf.dynobj;
2203 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2205 if (htab->elf.dynamic_sections_created)
2207 Elf64_External_Dyn *dyncon, *dynconend;
2209 if (sdyn == NULL || htab->sgot == NULL)
2210 abort ();
2212 dyncon = (Elf64_External_Dyn *) sdyn->contents;
2213 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2214 for (; dyncon < dynconend; dyncon++)
2216 Elf_Internal_Dyn dyn;
2217 asection *s;
2219 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
2221 switch (dyn.d_tag)
2223 default:
2224 continue;
2226 case DT_PLTGOT:
2227 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
2228 break;
2230 case DT_JMPREL:
2231 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
2232 break;
2234 case DT_PLTRELSZ:
2235 s = htab->srelplt->output_section;
2236 if (s->_cooked_size != 0)
2237 dyn.d_un.d_val = s->_cooked_size;
2238 else
2239 dyn.d_un.d_val = s->_raw_size;
2240 break;
2242 case DT_RELASZ:
2243 /* The procedure linkage table relocs (DT_JMPREL) should
2244 not be included in the overall relocs (DT_RELA).
2245 Therefore, we override the DT_RELASZ entry here to
2246 make it not include the JMPREL relocs. Since the
2247 linker script arranges for .rela.plt to follow all
2248 other relocation sections, we don't have to worry
2249 about changing the DT_RELA entry. */
2250 s = htab->srelplt->output_section;
2251 if (s->_cooked_size != 0)
2252 dyn.d_un.d_val -= s->_cooked_size;
2253 else
2254 dyn.d_un.d_val -= s->_raw_size;
2255 break;
2258 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
2261 /* Fill in the special first entry in the procedure linkage table. */
2262 if (htab->splt && htab->splt->_raw_size > 0)
2264 /* fill in blueprint for plt 0 entry */
2265 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0,
2266 htab->splt->contents );
2267 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
2268 htab->splt->contents +4 );
2269 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
2270 htab->splt->contents +12 );
2271 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
2272 htab->splt->contents +16 );
2273 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
2274 htab->splt->contents +20 );
2275 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6,
2276 htab->splt->contents + 24);
2277 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7,
2278 htab->splt->contents + 28 );
2279 /* Fixup relative address to start of GOT */
2280 bfd_put_32 (output_bfd,
2281 (htab->sgotplt->output_section->vma +
2282 htab->sgotplt->output_offset
2283 - htab->splt->output_section->vma - 6)/2,
2284 htab->splt->contents + 8);
2286 elf_section_data (htab->splt->output_section)
2287 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE;
2290 if (htab->sgotplt)
2292 /* Fill in the first three entries in the global offset table. */
2293 if (htab->sgotplt->_raw_size > 0)
2295 bfd_put_64 (output_bfd,
2296 (sdyn == NULL ? (bfd_vma) 0
2297 : sdyn->output_section->vma + sdyn->output_offset),
2298 htab->sgotplt->contents);
2299 /* One entry for shared object struct ptr. */
2300 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
2301 /* One entry for _dl_runtime_resolve. */
2302 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12);
2305 elf_section_data (htab->sgot->output_section)
2306 ->this_hdr.sh_entsize = 8;
2308 return true;
2311 static boolean
2312 elf_s390_object_p (abfd)
2313 bfd *abfd;
2315 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
2319 * Why was the hash table entry size definition changed from
2320 * ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
2321 * this is the only reason for the s390_elf64_size_info structure.
2324 const struct elf_size_info s390_elf64_size_info =
2326 sizeof (Elf64_External_Ehdr),
2327 sizeof (Elf64_External_Phdr),
2328 sizeof (Elf64_External_Shdr),
2329 sizeof (Elf64_External_Rel),
2330 sizeof (Elf64_External_Rela),
2331 sizeof (Elf64_External_Sym),
2332 sizeof (Elf64_External_Dyn),
2333 sizeof (Elf_External_Note),
2334 8, /* hash-table entry size */
2335 1, /* internal relocations per external relocations */
2336 64, /* arch_size */
2337 8, /* file_align */
2338 ELFCLASS64, EV_CURRENT,
2339 bfd_elf64_write_out_phdrs,
2340 bfd_elf64_write_shdrs_and_ehdr,
2341 bfd_elf64_write_relocs,
2342 bfd_elf64_swap_symbol_in,
2343 bfd_elf64_swap_symbol_out,
2344 bfd_elf64_slurp_reloc_table,
2345 bfd_elf64_slurp_symbol_table,
2346 bfd_elf64_swap_dyn_in,
2347 bfd_elf64_swap_dyn_out,
2348 NULL,
2349 NULL,
2350 NULL,
2351 NULL
2354 #define TARGET_BIG_SYM bfd_elf64_s390_vec
2355 #define TARGET_BIG_NAME "elf64-s390"
2356 #define ELF_ARCH bfd_arch_s390
2357 #define ELF_MACHINE_CODE EM_S390
2358 #define ELF_MACHINE_ALT1 EM_S390_OLD
2359 #define ELF_MAXPAGESIZE 0x1000
2361 #define elf_backend_size_info s390_elf64_size_info
2363 #define elf_backend_can_gc_sections 1
2364 #define elf_backend_can_refcount 1
2365 #define elf_backend_want_got_plt 1
2366 #define elf_backend_plt_readonly 1
2367 #define elf_backend_want_plt_sym 0
2368 #define elf_backend_got_header_size 24
2369 #define elf_backend_plt_header_size PLT_ENTRY_SIZE
2370 #define elf_backend_rela_normal 1
2372 #define elf_info_to_howto elf_s390_info_to_howto
2374 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
2375 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
2376 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
2378 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
2379 #define elf_backend_check_relocs elf_s390_check_relocs
2380 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
2381 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
2382 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
2383 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
2384 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
2385 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
2386 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
2387 #define elf_backend_relocate_section elf_s390_relocate_section
2388 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
2389 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
2391 #define elf_backend_object_p elf_s390_object_p
2393 #include "elf64-target.h"