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* elf-hppa.h (elf_hppa_relocate_section): If relocatable, return
[deliverable/binutils-gdb.git] / bfd / elf64-s390.c
CommitLineData
a85d7ed0 1/* IBM S/390-specific support for 64-bit ELF
e92d460e 2 Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
a85d7ed0
NC		 3 Contributed Martin Schwidefsky (schwidefsky@de.ibm.com).
4
5 This file is part of BFD, the Binary File Descriptor library.
6
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.
11
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.
16
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. */
21
22#include "bfd.h"
23#include "sysdep.h"
24#include "bfdlink.h"
25#include "libbfd.h"
26#include "elf-bfd.h"
27
28static reloc_howto_type *elf_s390_reloc_type_lookup
29 PARAMS ((bfd *, bfd_reloc_code_real_type));
30static void elf_s390_info_to_howto
31 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
0451c93c
MS		 32static boolean elf_s390_is_local_label_name
33 PARAMS ((bfd *, const char *));
34static struct bfd_hash_entry *link_hash_newfunc
a85d7ed0
NC		 35 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
36static struct bfd_link_hash_table *elf_s390_link_hash_table_create
37 PARAMS ((bfd *));
0451c93c
MS		 38static boolean create_got_section
39 PARAMS((bfd *, struct bfd_link_info *));
40static boolean elf_s390_create_dynamic_sections
41 PARAMS((bfd *, struct bfd_link_info *));
42static void elf_s390_copy_indirect_symbol
43 PARAMS ((struct elf_link_hash_entry *, struct elf_link_hash_entry *));
a85d7ed0
NC		 44static boolean elf_s390_check_relocs
45 PARAMS ((bfd *, struct bfd_link_info *, asection *,
46 const Elf_Internal_Rela *));
99c79b2e 47static asection *elf_s390_gc_mark_hook
1e2f5b6e 48 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
99c79b2e
AJ		 49 struct elf_link_hash_entry *, Elf_Internal_Sym *));
50static boolean elf_s390_gc_sweep_hook
51 PARAMS ((bfd *, struct bfd_link_info *, asection *,
52 const Elf_Internal_Rela *));
a85d7ed0
NC		 53static boolean elf_s390_adjust_dynamic_symbol
54 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
0451c93c
MS		 55static boolean allocate_dynrelocs
56 PARAMS ((struct elf_link_hash_entry *, PTR));
57static boolean readonly_dynrelocs
58 PARAMS ((struct elf_link_hash_entry *, PTR));
a85d7ed0
NC		 59static boolean elf_s390_size_dynamic_sections
60 PARAMS ((bfd *, struct bfd_link_info *));
61static boolean elf_s390_relocate_section
62 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
63 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
64static boolean elf_s390_finish_dynamic_symbol
65 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
66 Elf_Internal_Sym *));
0451c93c
MS		 67static enum elf_reloc_type_class elf_s390_reloc_type_class
68 PARAMS ((const Elf_Internal_Rela *));
a85d7ed0
NC		 69static boolean elf_s390_finish_dynamic_sections
70 PARAMS ((bfd *, struct bfd_link_info *));
99c79b2e 71static boolean elf_s390_object_p PARAMS ((bfd *));
a85d7ed0 72
a85d7ed0
NC		 73#include "elf/s390.h"
74
75/* In case we're on a 32-bit machine, construct a 64-bit "-1" value
76 from smaller values. Start with zero, widen, *then* decrement. */
77#define MINUS_ONE (((bfd_vma)0) - 1)
78
79/* The relocation "howto" table. */
80static reloc_howto_type elf_howto_table[] =
81{
82 HOWTO (R_390_NONE, /* type */
83 0, /* rightshift */
84 0, /* size (0 = byte, 1 = short, 2 = long) */
85 0, /* bitsize */
86 false, /* pc_relative */
87 0, /* bitpos */
88 complain_overflow_dont, /* complain_on_overflow */
89 bfd_elf_generic_reloc, /* special_function */
90 "R_390_NONE", /* name */
91 false, /* partial_inplace */
92 0, /* src_mask */
93 0, /* dst_mask */
94 false), /* pcrel_offset */
95
96 HOWTO(R_390_8, 0, 0, 8, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false),
97 HOWTO(R_390_12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false),
98 HOWTO(R_390_16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false),
99 HOWTO(R_390_32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false),
100 HOWTO(R_390_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true),
101 HOWTO(R_390_GOT12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false),
102 HOWTO(R_390_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false),
103 HOWTO(R_390_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true),
104 HOWTO(R_390_COPY, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_COPY", false, 0,MINUS_ONE, false),
105 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),
106 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),
107 HOWTO(R_390_RELATIVE, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_RELATIVE",false, 0,MINUS_ONE, false),
108 HOWTO(R_390_GOTOFF, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTOFF", false, 0,MINUS_ONE, false),
109 HOWTO(R_390_GOTPC, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,MINUS_ONE, true),
110 HOWTO(R_390_GOT16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false),
111 HOWTO(R_390_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true),
112 HOWTO(R_390_PC16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true),
113 HOWTO(R_390_PLT16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true),
114 HOWTO(R_390_PC32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true),
115 HOWTO(R_390_PLT32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true),
116 HOWTO(R_390_GOTPCDBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPCDBL", false, 0,MINUS_ONE, true),
117 HOWTO(R_390_64, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_64", false, 0,MINUS_ONE, false),
118 HOWTO(R_390_PC64, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC64", false, 0,MINUS_ONE, true),
119 HOWTO(R_390_GOT64, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT64", false, 0,MINUS_ONE, false),
120 HOWTO(R_390_PLT64, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT64", false, 0,MINUS_ONE, true),
121 HOWTO(R_390_GOTENT, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTENT", false, 0,MINUS_ONE, true),
122};
123
124/* GNU extension to record C++ vtable hierarchy. */
125static reloc_howto_type elf64_s390_vtinherit_howto =
126 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false);
127static reloc_howto_type elf64_s390_vtentry_howto =
99c79b2e 128 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);
a85d7ed0
NC		 129
130static reloc_howto_type *
131elf_s390_reloc_type_lookup (abfd, code)
132 bfd *abfd ATTRIBUTE_UNUSED;
133 bfd_reloc_code_real_type code;
134{
0451c93c
MS		 135 switch (code)
136 {
137 case BFD_RELOC_NONE:
138 return &elf_howto_table[(int) R_390_NONE];
139 case BFD_RELOC_8:
140 return &elf_howto_table[(int) R_390_8];
141 case BFD_RELOC_390_12:
142 return &elf_howto_table[(int) R_390_12];
143 case BFD_RELOC_16:
144 return &elf_howto_table[(int) R_390_16];
145 case BFD_RELOC_32:
146 return &elf_howto_table[(int) R_390_32];
147 case BFD_RELOC_CTOR:
148 return &elf_howto_table[(int) R_390_32];
149 case BFD_RELOC_32_PCREL:
150 return &elf_howto_table[(int) R_390_PC32];
151 case BFD_RELOC_390_GOT12:
152 return &elf_howto_table[(int) R_390_GOT12];
153 case BFD_RELOC_32_GOT_PCREL:
154 return &elf_howto_table[(int) R_390_GOT32];
155 case BFD_RELOC_390_PLT32:
156 return &elf_howto_table[(int) R_390_PLT32];
157 case BFD_RELOC_390_COPY:
158 return &elf_howto_table[(int) R_390_COPY];
159 case BFD_RELOC_390_GLOB_DAT:
160 return &elf_howto_table[(int) R_390_GLOB_DAT];
161 case BFD_RELOC_390_JMP_SLOT:
162 return &elf_howto_table[(int) R_390_JMP_SLOT];
163 case BFD_RELOC_390_RELATIVE:
164 return &elf_howto_table[(int) R_390_RELATIVE];
165 case BFD_RELOC_32_GOTOFF:
166 return &elf_howto_table[(int) R_390_GOTOFF];
167 case BFD_RELOC_390_GOTPC:
168 return &elf_howto_table[(int) R_390_GOTPC];
169 case BFD_RELOC_390_GOT16:
170 return &elf_howto_table[(int) R_390_GOT16];
171 case BFD_RELOC_16_PCREL:
172 return &elf_howto_table[(int) R_390_PC16];
173 case BFD_RELOC_390_PC16DBL:
174 return &elf_howto_table[(int) R_390_PC16DBL];
175 case BFD_RELOC_390_PLT16DBL:
176 return &elf_howto_table[(int) R_390_PLT16DBL];
177 case BFD_RELOC_VTABLE_INHERIT:
178 return &elf64_s390_vtinherit_howto;
179 case BFD_RELOC_VTABLE_ENTRY:
180 return &elf64_s390_vtentry_howto;
181 case BFD_RELOC_390_PC32DBL:
182 return &elf_howto_table[(int) R_390_PC32DBL];
183 case BFD_RELOC_390_PLT32DBL:
184 return &elf_howto_table[(int) R_390_PLT32DBL];
185 case BFD_RELOC_390_GOTPCDBL:
186 return &elf_howto_table[(int) R_390_GOTPCDBL];
187 case BFD_RELOC_64:
188 return &elf_howto_table[(int) R_390_64];
189 case BFD_RELOC_64_PCREL:
190 return &elf_howto_table[(int) R_390_PC64];
191 case BFD_RELOC_390_GOT64:
192 return &elf_howto_table[(int) R_390_GOT64];
193 case BFD_RELOC_390_PLT64:
194 return &elf_howto_table[(int) R_390_PLT64];
195 case BFD_RELOC_390_GOTENT:
196 return &elf_howto_table[(int) R_390_GOTENT];
197 default:
198 break;
199 }
a85d7ed0
NC		 200 return 0;
201}
202
203/* We need to use ELF64_R_TYPE so we have our own copy of this function,
204 and elf64-s390.c has its own copy. */
205
206static void
207elf_s390_info_to_howto (abfd, cache_ptr, dst)
208 bfd *abfd ATTRIBUTE_UNUSED;
209 arelent *cache_ptr;
210 Elf_Internal_Rela *dst;
211{
212 switch (ELF64_R_TYPE(dst->r_info))
213 {
214 case R_390_GNU_VTINHERIT:
215 cache_ptr->howto = &elf64_s390_vtinherit_howto;
216 break;
217
218 case R_390_GNU_VTENTRY:
219 cache_ptr->howto = &elf64_s390_vtentry_howto;
220 break;
221
222 default:
223 BFD_ASSERT (ELF64_R_TYPE(dst->r_info) < (unsigned int) R_390_max);
224 cache_ptr->howto = &elf_howto_table[ELF64_R_TYPE(dst->r_info)];
99c79b2e 225 }
a85d7ed0
NC		 226}
227
228static boolean
229elf_s390_is_local_label_name (abfd, name)
230 bfd *abfd;
231 const char *name;
232{
233 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
234 return true;
235
236 return _bfd_elf_is_local_label_name (abfd, name);
237}
238
239/* Functions for the 390 ELF linker. */
240
241/* The name of the dynamic interpreter. This is put in the .interp
242 section. */
243
244#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
245
a85d7ed0
NC		 246/* The size in bytes of the first entry in the procedure linkage table. */
247#define PLT_FIRST_ENTRY_SIZE 32
248/* The size in bytes of an entry in the procedure linkage table. */
99c79b2e 249#define PLT_ENTRY_SIZE 32
a85d7ed0
NC		 250
251#define GOT_ENTRY_SIZE 8
252
253/* The first three entries in a procedure linkage table are reserved,
254 and the initial contents are unimportant (we zero them out).
255 Subsequent entries look like this. See the SVR4 ABI 386
256 supplement to see how this works. */
257
258/* For the s390, simple addr offset can only be 0 - 4096.
259 To use the full 16777216 TB address space, several instructions
260 are needed to load an address in a register and execute
261 a branch( or just saving the address)
262
99c79b2e 263 Furthermore, only r 0 and 1 are free to use!!! */
a85d7ed0
NC		 264
265/* The first 3 words in the GOT are then reserved.
266 Word 0 is the address of the dynamic table.
267 Word 1 is a pointer to a structure describing the object
268 Word 2 is used to point to the loader entry address.
269
270 The code for PLT entries looks like this:
271
272 The GOT holds the address in the PLT to be executed.
273 The loader then gets:
274 24(15) = Pointer to the structure describing the object.
99c79b2e 275 28(15) = Offset in symbol table
a85d7ed0
NC		 276 The loader must then find the module where the function is
277 and insert the address in the GOT.
278
279 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
280 LG 1,0(1) # 6 bytes Load address from GOT in r1
281 BCR 15,1 # 2 bytes Jump to address
282 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
283 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1
284 BRCL 15,-x # 6 bytes Jump to start of PLT
285 .long ? # 4 bytes offset into symbol table
286
287 Total = 32 bytes per PLT entry
288 Fixup at offset 2: relative address to GOT entry
289 Fixup at offset 22: relative branch to PLT0
290 Fixup at offset 28: 32 bit offset into symbol table
291
292 A 32 bit offset into the symbol table is enough. It allows for symbol
293 tables up to a size of 2 gigabyte. A single dynamic object (the main
294 program, any shared library) is limited to 4GB in size and I want to see
295 the program that manages to have a symbol table of more than 2 GB with a
296 total size of at max 4 GB. */
297
dc810e39
AM		 298#define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000
299#define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310
300#define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004
301#define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10
302#define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c
303#define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4
304#define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000
305#define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000
a85d7ed0
NC		 306
307/* The first PLT entry pushes the offset into the symbol table
308 from R1 onto the stack at 8(15) and the loader object info
309 at 12(15), loads the loader address in R1 and jumps to it. */
310
311/* The first entry in the PLT:
312
313 PLT0:
314 STG 1,56(15) # r1 contains the offset into the symbol table
315 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
316 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
317 LG 1,16(1) # get entry address of loader
318 BCR 15,1 # jump to loader
319
320 Fixup at offset 8: relative address to start of GOT. */
321
dc810e39
AM		 322#define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038
323#define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010
324#define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000
325#define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030
326#define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310
327#define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004
328#define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700
329#define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700
a85d7ed0
NC		 330
331/* The s390 linker needs to keep track of the number of relocs that it
0451c93c
MS		 332 decides to copy as dynamic relocs in check_relocs for each symbol.
333 This is so that it can later discard them if they are found to be
334 unnecessary. We store the information in a field extending the
335 regular ELF linker hash table. */
a85d7ed0 336
0451c93c 337struct elf_s390_dyn_relocs
a85d7ed0 338{
0451c93c
MS		 339 struct elf_s390_dyn_relocs *next;
340
341 /* The input section of the reloc. */
342 asection *sec;
343
344 /* Total number of relocs copied for the input section. */
a85d7ed0 345 bfd_size_type count;
0451c93c
MS		 346
347 /* Number of pc-relative relocs copied for the input section. */
348 bfd_size_type pc_count;
a85d7ed0
NC		 349};
350
351/* s390 ELF linker hash entry. */
352
353struct elf_s390_link_hash_entry
354{
0451c93c 355 struct elf_link_hash_entry elf;
a85d7ed0 356
0451c93c
MS		 357 /* Track dynamic relocs copied for this symbol. */
358 struct elf_s390_dyn_relocs *dyn_relocs;
a85d7ed0
NC		 359};
360
361/* s390 ELF linker hash table. */
362
363struct elf_s390_link_hash_table
364{
0451c93c 365 struct elf_link_hash_table elf;
a85d7ed0 366
0451c93c
MS		 367 /* Short-cuts to get to dynamic linker sections. */
368 asection *sgot;
369 asection *sgotplt;
370 asection *srelgot;
371 asection *splt;
372 asection *srelplt;
373 asection *sdynbss;
374 asection *srelbss;
ec338859
AM		 375
376 /* Small local sym to section mapping cache. */
377 struct sym_sec_cache sym_sec;
0451c93c 378};
a85d7ed0
NC		 379
380/* Get the s390 ELF linker hash table from a link_info structure. */
381
382#define elf_s390_hash_table(p) \
383 ((struct elf_s390_link_hash_table *) ((p)->hash))
384
385/* Create an entry in an s390 ELF linker hash table. */
386
387static struct bfd_hash_entry *
0451c93c 388link_hash_newfunc (entry, table, string)
a85d7ed0
NC		 389 struct bfd_hash_entry *entry;
390 struct bfd_hash_table *table;
391 const char *string;
392{
a85d7ed0
NC		 393 /* Allocate the structure if it has not already been allocated by a
394 subclass. */
0451c93c
MS		 395 if (entry == NULL)
396 {
397 entry = bfd_hash_allocate (table,
398 sizeof (struct elf_s390_link_hash_entry));
399 if (entry == NULL)
400 return entry;
401 }
a85d7ed0
NC		 402
403 /* Call the allocation method of the superclass. */
0451c93c
MS		 404 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
405 if (entry != NULL)
a85d7ed0 406 {
0451c93c
MS		 407 struct elf_s390_link_hash_entry *eh;
408
409 eh = (struct elf_s390_link_hash_entry *) entry;
410 eh->dyn_relocs = NULL;
a85d7ed0
NC		 411 }
412
0451c93c 413 return entry;
a85d7ed0
NC		 414}
415
416/* Create an s390 ELF linker hash table. */
417
418static struct bfd_link_hash_table *
419elf_s390_link_hash_table_create (abfd)
420 bfd *abfd;
421{
422 struct elf_s390_link_hash_table *ret;
dc810e39 423 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
a85d7ed0 424
e2d34d7d 425 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
0451c93c 426 if (ret == NULL)
a85d7ed0
NC		 427 return NULL;
428
0451c93c 429 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
a85d7ed0 430 {
e2d34d7d 431 free (ret);
a85d7ed0
NC		 432 return NULL;
433 }
434
0451c93c
MS		 435 ret->sgot = NULL;
436 ret->sgotplt = NULL;
437 ret->srelgot = NULL;
438 ret->splt = NULL;
439 ret->srelplt = NULL;
440 ret->sdynbss = NULL;
441 ret->srelbss = NULL;
ec338859 442 ret->sym_sec.abfd = NULL;
0451c93c
MS		 443
444 return &ret->elf.root;
445}
446
447/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
448 shortcuts to them in our hash table. */
449
450static boolean
451create_got_section (dynobj, info)
452 bfd *dynobj;
453 struct bfd_link_info *info;
454{
455 struct elf_s390_link_hash_table *htab;
456
457 if (! _bfd_elf_create_got_section (dynobj, info))
458 return false;
459
460 htab = elf_s390_hash_table (info);
461 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
462 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
463 if (!htab->sgot || !htab->sgotplt)
464 abort ();
465
466 htab->srelgot = bfd_make_section (dynobj, ".rela.got");
467 if (htab->srelgot == NULL
468 || ! bfd_set_section_flags (dynobj, htab->srelgot,
469 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
470 | SEC_IN_MEMORY | SEC_LINKER_CREATED
471 | SEC_READONLY))
99881371 472 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3))
0451c93c
MS		 473 return false;
474 return true;
475}
476
477/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
478 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
479 hash table. */
480
481static boolean
482elf_s390_create_dynamic_sections (dynobj, info)
483 bfd *dynobj;
484 struct bfd_link_info *info;
485{
486 struct elf_s390_link_hash_table *htab;
487
488 htab = elf_s390_hash_table (info);
489 if (!htab->sgot && !create_got_section (dynobj, info))
490 return false;
491
492 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
493 return false;
494
495 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
496 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
497 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
498 if (!info->shared)
499 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
500
501 if (!htab->splt || !htab->srelplt || !htab->sdynbss
502 || (!info->shared && !htab->srelbss))
503 abort ();
504
505 return true;
a85d7ed0
NC		 506}
507
0451c93c
MS		 508/* Copy the extra info we tack onto an elf_link_hash_entry. */
509
510static void
511elf_s390_copy_indirect_symbol (dir, ind)
512 struct elf_link_hash_entry *dir, *ind;
513{
514 struct elf_s390_link_hash_entry *edir, *eind;
515
516 edir = (struct elf_s390_link_hash_entry *) dir;
517 eind = (struct elf_s390_link_hash_entry *) ind;
518
519 if (eind->dyn_relocs != NULL)
520 {
521 if (edir->dyn_relocs != NULL)
522 {
523 struct elf_s390_dyn_relocs **pp;
524 struct elf_s390_dyn_relocs *p;
525
526 if (ind->root.type == bfd_link_hash_indirect)
527 abort ();
528
529 /* Add reloc counts against the weak sym to the strong sym
530 list. Merge any entries against the same section. */
531 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
532 {
533 struct elf_s390_dyn_relocs *q;
534
535 for (q = edir->dyn_relocs; q != NULL; q = q->next)
536 if (q->sec == p->sec)
537 {
538 q->pc_count += p->pc_count;
539 q->count += p->count;
540 *pp = p->next;
541 break;
542 }
543 if (q == NULL)
544 pp = &p->next;
545 }
546 *pp = edir->dyn_relocs;
547 }
548
549 edir->dyn_relocs = eind->dyn_relocs;
550 eind->dyn_relocs = NULL;
551 }
552
553 _bfd_elf_link_hash_copy_indirect (dir, ind);
554}
a85d7ed0
NC		 555
556/* Look through the relocs for a section during the first phase, and
557 allocate space in the global offset table or procedure linkage
558 table. */
559
560static boolean
561elf_s390_check_relocs (abfd, info, sec, relocs)
562 bfd *abfd;
563 struct bfd_link_info *info;
564 asection *sec;
565 const Elf_Internal_Rela *relocs;
566{
0451c93c 567 struct elf_s390_link_hash_table *htab;
a85d7ed0
NC		 568 Elf_Internal_Shdr *symtab_hdr;
569 struct elf_link_hash_entry **sym_hashes;
a85d7ed0
NC		 570 const Elf_Internal_Rela *rel;
571 const Elf_Internal_Rela *rel_end;
a85d7ed0
NC		 572 asection *sreloc;
573
574 if (info->relocateable)
575 return true;
576
0451c93c 577 htab = elf_s390_hash_table (info);
a85d7ed0
NC		 578 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
579 sym_hashes = elf_sym_hashes (abfd);
a85d7ed0 580
a85d7ed0
NC		 581 sreloc = NULL;
582
583 rel_end = relocs + sec->reloc_count;
584 for (rel = relocs; rel < rel_end; rel++)
585 {
586 unsigned long r_symndx;
587 struct elf_link_hash_entry *h;
588
589 r_symndx = ELF64_R_SYM (rel->r_info);
590
0451c93c
MS		 591 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
592 {
593 (*_bfd_error_handler) (_("%s: bad symbol index: %d"),
594 bfd_archive_filename (abfd),
595 r_symndx);
596 return false;
597 }
598
a85d7ed0
NC		 599 if (r_symndx < symtab_hdr->sh_info)
600 h = NULL;
601 else
99c79b2e 602 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
a85d7ed0 603
a85d7ed0
NC		 604 switch (ELF64_R_TYPE (rel->r_info))
605 {
606 case R_390_GOT12:
607 case R_390_GOT16:
608 case R_390_GOT32:
609 case R_390_GOT64:
610 case R_390_GOTENT:
611 /* This symbol requires a global offset table entry. */
a85d7ed0
NC		 612 if (h != NULL)
613 {
51b64d56 614 h->got.refcount += 1;
a85d7ed0
NC		 615 }
616 else
617 {
0451c93c
MS		 618 bfd_signed_vma *local_got_refcounts;
619
99c79b2e 620 /* This is a global offset table entry for a local symbol. */
0451c93c 621 local_got_refcounts = elf_local_got_refcounts (abfd);
a85d7ed0
NC		 622 if (local_got_refcounts == NULL)
623 {
dc810e39 624 bfd_size_type size;
ec338859 625
0451c93c
MS		 626 size = symtab_hdr->sh_info;
627 size *= sizeof (bfd_signed_vma);
dc810e39 628 local_got_refcounts = ((bfd_signed_vma *)
51b64d56 629 bfd_zalloc (abfd, size));
a85d7ed0
NC		 630 if (local_got_refcounts == NULL)
631 return false;
632 elf_local_got_refcounts (abfd) = local_got_refcounts;
a85d7ed0 633 }
51b64d56 634 local_got_refcounts[r_symndx] += 1;
a85d7ed0 635 }
0451c93c 636 /* Fall through */
a85d7ed0 637
0451c93c
MS		 638 case R_390_GOTOFF:
639 case R_390_GOTPC:
640 case R_390_GOTPCDBL:
641 if (htab->sgot == NULL)
642 {
643 if (htab->elf.dynobj == NULL)
644 htab->elf.dynobj = abfd;
645 if (!create_got_section (htab->elf.dynobj, info))
646 return false;
647 }
648 break;
ec338859 649
a85d7ed0
NC		 650 case R_390_PLT16DBL:
651 case R_390_PLT32:
652 case R_390_PLT32DBL:
653 case R_390_PLT64:
654 /* This symbol requires a procedure linkage table entry. We
655 actually build the entry in adjust_dynamic_symbol,
656 because this might be a case of linking PIC code which is
657 never referenced by a dynamic object, in which case we
658 don't need to generate a procedure linkage table entry
659 after all. */
ec338859 660
a85d7ed0
NC		 661 /* If this is a local symbol, we resolve it directly without
662 creating a procedure linkage table entry. */
663 if (h == NULL)
664 continue;
ec338859 665
51b64d56
AM		 666 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
667 h->plt.refcount += 1;
a85d7ed0 668 break;
ec338859 669
a85d7ed0
NC		 670 case R_390_8:
671 case R_390_16:
672 case R_390_32:
673 case R_390_64:
674 case R_390_PC16:
675 case R_390_PC16DBL:
676 case R_390_PC32:
677 case R_390_PC32DBL:
678 case R_390_PC64:
0451c93c
MS		 679 if (h != NULL && !info->shared)
680 {
681 /* If this reloc is in a read-only section, we might
682 need a copy reloc. We can't check reliably at this
683 stage whether the section is read-only, as input
684 sections have not yet been mapped to output sections.
685 Tentatively set the flag for now, and correct in
686 adjust_dynamic_symbol. */
687 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
ec338859 688
0451c93c
MS		 689 /* We may need a .plt entry if the function this reloc
690 refers to is in a shared lib. */
691 h->plt.refcount += 1;
692 }
ec338859 693
a85d7ed0 694 /* If we are creating a shared library, and this is a reloc
0451c93c
MS		 695 against a global symbol, or a non PC relative reloc
696 against a local symbol, then we need to copy the reloc
697 into the shared library. However, if we are linking with
698 -Bsymbolic, we do not need to copy a reloc against a
699 global symbol which is defined in an object we are
700 including in the link (i.e., DEF_REGULAR is set). At
701 this point we have not seen all the input files, so it is
702 possible that DEF_REGULAR is not set now but will be set
703 later (it is never cleared). In case of a weak definition,
704 DEF_REGULAR may be cleared later by a strong definition in
705 a shared library. We account for that possibility below by
706 storing information in the relocs_copied field of the hash
707 table entry. A similar situation occurs when creating
708 shared libraries and symbol visibility changes render the
709 symbol local.
710
711 If on the other hand, we are creating an executable, we
712 may need to keep relocations for symbols satisfied by a
713 dynamic library if we manage to avoid copy relocs for the
714 symbol. */
715 if ((info->shared
716 && (sec->flags & SEC_ALLOC) != 0
717 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
718 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
719 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
720 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
721 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
722 || (h != NULL
723 && (! info->symbolic
724 || h->root.type == bfd_link_hash_defweak
725 || (h->elf_link_hash_flags
726 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
727 || (!info->shared
728 && (sec->flags & SEC_ALLOC) != 0
729 && h != NULL
730 && (h->root.type == bfd_link_hash_defweak
731 || (h->elf_link_hash_flags
732 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
a85d7ed0 733 {
ec338859
AM		 734 struct elf_s390_dyn_relocs *p;
735 struct elf_s390_dyn_relocs **head;
736
0451c93c
MS		 737 /* We must copy these reloc types into the output file.
738 Create a reloc section in dynobj and make room for
739 this reloc. */
a85d7ed0
NC		 740 if (sreloc == NULL)
741 {
742 const char *name;
0451c93c 743 bfd *dynobj;
ec338859 744
a85d7ed0
NC		 745 name = (bfd_elf_string_from_elf_section
746 (abfd,
747 elf_elfheader (abfd)->e_shstrndx,
748 elf_section_data (sec)->rel_hdr.sh_name));
749 if (name == NULL)
750 return false;
ec338859 751
0451c93c
MS		 752 if (strncmp (name, ".rela", 5) != 0
753 || strcmp (bfd_get_section_name (abfd, sec),
754 name + 5) != 0)
755 {
756 (*_bfd_error_handler)
757 (_("%s: bad relocation section name `%s\'"),
758 bfd_archive_filename (abfd), name);
759 }
ec338859 760
0451c93c
MS		 761 if (htab->elf.dynobj == NULL)
762 htab->elf.dynobj = abfd;
a85d7ed0 763
0451c93c 764 dynobj = htab->elf.dynobj;
a85d7ed0
NC		 765 sreloc = bfd_get_section_by_name (dynobj, name);
766 if (sreloc == NULL)
767 {
768 flagword flags;
ec338859 769
a85d7ed0
NC		 770 sreloc = bfd_make_section (dynobj, name);
771 flags = (SEC_HAS_CONTENTS | SEC_READONLY
772 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
773 if ((sec->flags & SEC_ALLOC) != 0)
774 flags |= SEC_ALLOC | SEC_LOAD;
775 if (sreloc == NULL
776 || ! bfd_set_section_flags (dynobj, sreloc, flags)
99881371 777 || ! bfd_set_section_alignment (dynobj, sreloc, 3))
a85d7ed0
NC		 778 return false;
779 }
0451c93c 780 elf_section_data (sec)->sreloc = sreloc;
a85d7ed0 781 }
ec338859 782
0451c93c
MS		 783 /* If this is a global symbol, we count the number of
784 relocations we need for this symbol. */
785 if (h != NULL)
a85d7ed0 786 {
ec338859 787 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
0451c93c
MS		 788 }
789 else
790 {
ec338859
AM		 791 /* Track dynamic relocs needed for local syms too.
792 We really need local syms available to do this
793 easily. Oh well. */
794
795 asection *s;
796 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
797 sec, r_symndx);
798 if (s == NULL)
799 return false;
800
801 head = ((struct elf_s390_dyn_relocs **)
802 &elf_section_data (s)->local_dynrel);
803 }
804
805 p = *head;
806 if (p == NULL || p->sec != sec)
807 {
808 bfd_size_type amt = sizeof *p;
809 p = ((struct elf_s390_dyn_relocs *)
810 bfd_alloc (htab->elf.dynobj, amt));
811 if (p == NULL)
812 return false;
813 p->next = *head;
814 *head = p;
815 p->sec = sec;
816 p->count = 0;
817 p->pc_count = 0;
a85d7ed0 818 }
ec338859
AM		 819
820 p->count += 1;
821 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
822 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
823 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
824 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
825 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
826 p->pc_count += 1;
a85d7ed0 827 }
a85d7ed0 828 break;
ec338859 829
a85d7ed0
NC		 830 /* This relocation describes the C++ object vtable hierarchy.
831 Reconstruct it for later use during GC. */
832 case R_390_GNU_VTINHERIT:
833 if (!_bfd_elf64_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
834 return false;
835 break;
ec338859 836
a85d7ed0
NC		 837 /* This relocation describes which C++ vtable entries are actually
838 used. Record for later use during GC. */
839 case R_390_GNU_VTENTRY:
db727808 840 if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend))
a85d7ed0
NC		 841 return false;
842 break;
ec338859 843
a85d7ed0
NC		 844 default:
845 break;
846 }
847 }
848
849 return true;
850}
851
852/* Return the section that should be marked against GC for a given
853 relocation. */
854
855static asection *
1e2f5b6e
AM		 856elf_s390_gc_mark_hook (sec, info, rel, h, sym)
857 asection *sec;
a85d7ed0
NC		 858 struct bfd_link_info *info ATTRIBUTE_UNUSED;
859 Elf_Internal_Rela *rel;
860 struct elf_link_hash_entry *h;
861 Elf_Internal_Sym *sym;
862{
863 if (h != NULL)
864 {
865 switch (ELF64_R_TYPE (rel->r_info))
866 {
867 case R_390_GNU_VTINHERIT:
868 case R_390_GNU_VTENTRY:
869 break;
870
871 default:
872 switch (h->root.type)
873 {
874 case bfd_link_hash_defined:
875 case bfd_link_hash_defweak:
876 return h->root.u.def.section;
877
878 case bfd_link_hash_common:
879 return h->root.u.c.p->section;
880
881 default:
882 break;
883 }
884 }
885 }
886 else
1e2f5b6e 887 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
a85d7ed0
NC		 888
889 return NULL;
890}
891
892/* Update the got entry reference counts for the section being removed. */
893
894static boolean
895elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
0451c93c
MS		 896 bfd *abfd;
897 struct bfd_link_info *info;
898 asection *sec;
899 const Elf_Internal_Rela *relocs;
a85d7ed0
NC		 900{
901 Elf_Internal_Shdr *symtab_hdr;
902 struct elf_link_hash_entry **sym_hashes;
903 bfd_signed_vma *local_got_refcounts;
904 const Elf_Internal_Rela *rel, *relend;
905 unsigned long r_symndx;
906 struct elf_link_hash_entry *h;
a85d7ed0 907
ec338859 908 elf_section_data (sec)->local_dynrel = NULL;
a85d7ed0 909
0451c93c
MS		 910 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
911 sym_hashes = elf_sym_hashes (abfd);
912 local_got_refcounts = elf_local_got_refcounts (abfd);
a85d7ed0
NC		 913
914 relend = relocs + sec->reloc_count;
915 for (rel = relocs; rel < relend; rel++)
916 switch (ELF64_R_TYPE (rel->r_info))
917 {
918 case R_390_GOT12:
919 case R_390_GOT16:
920 case R_390_GOT32:
921 case R_390_GOT64:
922 case R_390_GOTOFF:
923 case R_390_GOTPC:
924 case R_390_GOTPCDBL:
925 case R_390_GOTENT:
926 r_symndx = ELF64_R_SYM (rel->r_info);
927 if (r_symndx >= symtab_hdr->sh_info)
928 {
929 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
930 if (h->got.refcount > 0)
0451c93c 931 h->got.refcount -= 1;
a85d7ed0
NC		 932 }
933 else if (local_got_refcounts != NULL)
934 {
935 if (local_got_refcounts[r_symndx] > 0)
0451c93c
MS		 936 local_got_refcounts[r_symndx] -= 1;
937 }
938 break;
939
940 case R_390_8:
941 case R_390_12:
942 case R_390_16:
943 case R_390_32:
944 case R_390_64:
945 case R_390_PC16:
946 case R_390_PC16DBL:
947 case R_390_PC32:
948 case R_390_PC32DBL:
949 case R_390_PC64:
950 r_symndx = ELF64_R_SYM (rel->r_info);
951 if (r_symndx >= symtab_hdr->sh_info)
952 {
953 struct elf_s390_link_hash_entry *eh;
954 struct elf_s390_dyn_relocs **pp;
955 struct elf_s390_dyn_relocs *p;
956
957 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
958
959 if (!info->shared && h->plt.refcount > 0)
960 h->plt.refcount -= 1;
961
962 eh = (struct elf_s390_link_hash_entry *) h;
963
964 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
965 if (p->sec == sec)
966 {
967 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
968 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
969 || ELF64_R_TYPE (rel->r_info) == R_390_PC32)
970 p->pc_count -= 1;
971 p->count -= 1;
972 if (p->count == 0)
973 *pp = p->next;
974 break;
975 }
a85d7ed0
NC		 976 }
977 break;
978
979 case R_390_PLT16DBL:
980 case R_390_PLT32:
981 case R_390_PLT32DBL:
982 case R_390_PLT64:
983 r_symndx = ELF64_R_SYM (rel->r_info);
984 if (r_symndx >= symtab_hdr->sh_info)
985 {
986 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
987 if (h->plt.refcount > 0)
988 h->plt.refcount -= 1;
989 }
990 break;
991
992 default:
993 break;
994 }
995
996 return true;
997}
998
999/* Adjust a symbol defined by a dynamic object and referenced by a
1000 regular object. The current definition is in some section of the
1001 dynamic object, but we're not including those sections. We have to
1002 change the definition to something the rest of the link can
1003 understand. */
1004
1005static boolean
1006elf_s390_adjust_dynamic_symbol (info, h)
1007 struct bfd_link_info *info;
1008 struct elf_link_hash_entry *h;
1009{
0451c93c
MS		 1010 struct elf_s390_link_hash_table *htab;
1011 struct elf_s390_link_hash_entry * eh;
1012 struct elf_s390_dyn_relocs *p;
a85d7ed0
NC		 1013 asection *s;
1014 unsigned int power_of_two;
1015
a85d7ed0
NC		 1016 /* If this is a function, put it in the procedure linkage table. We
1017 will fill in the contents of the procedure linkage table later
cedb70c5 1018 (although we could actually do it here). */
a85d7ed0
NC		 1019 if (h->type == STT_FUNC
1020 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
1021 {
0451c93c
MS		 1022 if (h->plt.refcount <= 0
1023 || (! info->shared
1024 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
f9cd9119
MS		 1025 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
1026 && h->root.type != bfd_link_hash_undefweak
1027 && h->root.type != bfd_link_hash_undefined))
a85d7ed0
NC		 1028 {
1029 /* This case can occur if we saw a PLT32 reloc in an input
1030 file, but the symbol was never referred to by a dynamic
0451c93c
MS		 1031 object, or if all references were garbage collected. In
1032 such a case, we don't actually need to build a procedure
1033 linkage table, and we can just do a PC32 reloc instead. */
a85d7ed0
NC		 1034 h->plt.offset = (bfd_vma) -1;
1035 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
a85d7ed0
NC		 1036 }
1037
a85d7ed0
NC		 1038 return true;
1039 }
bbd7ec4a 1040 else
0451c93c
MS		 1041 /* It's possible that we incorrectly decided a .plt reloc was
1042 needed for an R_390_PC32 reloc to a non-function sym in
1043 check_relocs. We can't decide accurately between function and
1044 non-function syms in check-relocs; Objects loaded later in
1045 the link may change h->type. So fix it now. */
bbd7ec4a 1046 h->plt.offset = (bfd_vma) -1;
a85d7ed0
NC		 1047
1048 /* If this is a weak symbol, and there is a real definition, the
1049 processor independent code will have arranged for us to see the
1050 real definition first, and we can just use the same value. */
1051 if (h->weakdef != NULL)
1052 {
1053 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1054 || h->weakdef->root.type == bfd_link_hash_defweak);
1055 h->root.u.def.section = h->weakdef->root.u.def.section;
1056 h->root.u.def.value = h->weakdef->root.u.def.value;
1057 return true;
1058 }
1059
1060 /* This is a reference to a symbol defined by a dynamic object which
1061 is not a function. */
1062
1063 /* If we are creating a shared library, we must presume that the
1064 only references to the symbol are via the global offset table.
1065 For such cases we need not do anything here; the relocations will
1066 be handled correctly by relocate_section. */
1067 if (info->shared)
1068 return true;
1069
1070 /* If there are no references to this symbol that do not use the
1071 GOT, we don't need to generate a copy reloc. */
1072 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1073 return true;
1074
0451c93c
MS		 1075 /* If -z nocopyreloc was given, we won't generate them either. */
1076 if (info->nocopyreloc)
1077 {
1078 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1079 return true;
1080 }
1081
1082 eh = (struct elf_s390_link_hash_entry *) h;
1083 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1084 {
1085 s = p->sec->output_section;
1086 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1087 break;
1088 }
1089
1090 /* If we didn't find any dynamic relocs in read-only sections, then
1091 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1092 if (p == NULL)
1093 {
1094 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1095 return true;
1096 }
1097
a85d7ed0
NC		 1098 /* We must allocate the symbol in our .dynbss section, which will
1099 become part of the .bss section of the executable. There will be
1100 an entry for this symbol in the .dynsym section. The dynamic
1101 object will contain position independent code, so all references
1102 from the dynamic object to this symbol will go through the global
1103 offset table. The dynamic linker will use the .dynsym entry to
1104 determine the address it must put in the global offset table, so
1105 both the dynamic object and the regular object will refer to the
1106 same memory location for the variable. */
1107
0451c93c 1108 htab = elf_s390_hash_table (info);
a85d7ed0 1109
0451c93c
MS		 1110 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1111 copy the initial value out of the dynamic object and into the
1112 runtime process image. */
a85d7ed0
NC		 1113 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1114 {
0451c93c 1115 htab->srelbss->_raw_size += sizeof (Elf64_External_Rela);
a85d7ed0
NC		 1116 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1117 }
1118
1119 /* We need to figure out the alignment required for this symbol. I
1120 have no idea how ELF linkers handle this. */
1121 power_of_two = bfd_log2 (h->size);
1122 if (power_of_two > 3)
1123 power_of_two = 3;
1124
1125 /* Apply the required alignment. */
0451c93c
MS		 1126 s = htab->sdynbss;
1127 s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
1128 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
a85d7ed0 1129 {
0451c93c 1130 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
a85d7ed0
NC		 1131 return false;
1132 }
1133
1134 /* Define the symbol as being at this point in the section. */
1135 h->root.u.def.section = s;
1136 h->root.u.def.value = s->_raw_size;
1137
1138 /* Increment the section size to make room for the symbol. */
1139 s->_raw_size += h->size;
1140
1141 return true;
1142}
1143
0451c93c
MS		 1144/* This is the condition under which elf_s390_finish_dynamic_symbol
1145 will be called from elflink.h. If elflink.h doesn't call our
1146 finish_dynamic_symbol routine, we'll need to do something about
1147 initializing any .plt and .got entries in elf_s390_relocate_section. */
1148#define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \
1149 ((DYN) \
1150 && ((INFO)->shared \
1151 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1152 && ((H)->dynindx != -1 \
1153 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1154
1155/* Allocate space in .plt, .got and associated reloc sections for
1156 dynamic relocs. */
1157
1158static boolean
1159allocate_dynrelocs (h, inf)
1160 struct elf_link_hash_entry *h;
1161 PTR inf;
1162{
1163 struct bfd_link_info *info;
1164 struct elf_s390_link_hash_table *htab;
1165 struct elf_s390_link_hash_entry *eh;
1166 struct elf_s390_dyn_relocs *p;
1167
e92d460e 1168 if (h->root.type == bfd_link_hash_indirect)
0451c93c
MS		 1169 return true;
1170
e92d460e
AM		 1171 if (h->root.type == bfd_link_hash_warning)
1172 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1173
0451c93c
MS		 1174 info = (struct bfd_link_info *) inf;
1175 htab = elf_s390_hash_table (info);
1176
1177 if (htab->elf.dynamic_sections_created
1178 && h->plt.refcount > 0)
1179 {
1180 /* Make sure this symbol is output as a dynamic symbol.
1181 Undefined weak syms won't yet be marked as dynamic. */
1182 if (h->dynindx == -1
1183 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1184 {
1185 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
1186 return false;
1187 }
1188
1189 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h))
1190 {
1191 asection *s = htab->splt;
1192
1193 /* If this is the first .plt entry, make room for the special
1194 first entry. */
1195 if (s->_raw_size == 0)
1196 s->_raw_size += PLT_FIRST_ENTRY_SIZE;
1197
1198 h->plt.offset = s->_raw_size;
1199
1200 /* If this symbol is not defined in a regular file, and we are
1201 not generating a shared library, then set the symbol to this
1202 location in the .plt. This is required to make function
1203 pointers compare as equal between the normal executable and
1204 the shared library. */
1205 if (! info->shared
1206 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1207 {
1208 h->root.u.def.section = s;
1209 h->root.u.def.value = h->plt.offset;
1210 }
ec338859 1211
0451c93c
MS		 1212 /* Make room for this entry. */
1213 s->_raw_size += PLT_ENTRY_SIZE;
ec338859 1214
0451c93c
MS		 1215 /* We also need to make an entry in the .got.plt section, which
1216 will be placed in the .got section by the linker script. */
1217 htab->sgotplt->_raw_size += GOT_ENTRY_SIZE;
1218
1219 /* We also need to make an entry in the .rela.plt section. */
1220 htab->srelplt->_raw_size += sizeof (Elf64_External_Rela);
1221 }
1222 else
1223 {
1224 h->plt.offset = (bfd_vma) -1;
1225 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1226 }
1227 }
1228 else
1229 {
1230 h->plt.offset = (bfd_vma) -1;
1231 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1232 }
1233
1234 if (h->got.refcount > 0)
1235 {
1236 asection *s;
1237 boolean dyn;
1238
1239 /* Make sure this symbol is output as a dynamic symbol.
1240 Undefined weak syms won't yet be marked as dynamic. */
1241 if (h->dynindx == -1
1242 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1243 {
1244 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
1245 return false;
1246 }
1247
1248 s = htab->sgot;
1249 h->got.offset = s->_raw_size;
1250 s->_raw_size += GOT_ENTRY_SIZE;
1251 dyn = htab->elf.dynamic_sections_created;
1252 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h))
1253 htab->srelgot->_raw_size += sizeof (Elf64_External_Rela);
1254 }
1255 else
1256 h->got.offset = (bfd_vma) -1;
1257
1258 eh = (struct elf_s390_link_hash_entry *) h;
1259 if (eh->dyn_relocs == NULL)
1260 return true;
1261
1262 /* In the shared -Bsymbolic case, discard space allocated for
1263 dynamic pc-relative relocs against symbols which turn out to be
1264 defined in regular objects. For the normal shared case, discard
1265 space for pc-relative relocs that have become local due to symbol
1266 visibility changes. */
1267
1268 if (info->shared)
1269 {
1270 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1271 && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
1272 || info->symbolic))
1273 {
1274 struct elf_s390_dyn_relocs **pp;
1275
1276 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1277 {
1278 p->count -= p->pc_count;
1279 p->pc_count = 0;
1280 if (p->count == 0)
1281 *pp = p->next;
1282 else
1283 pp = &p->next;
1284 }
1285 }
1286 }
1287 else
1288 {
1289 /* For the non-shared case, discard space for relocs against
1290 symbols which turn out to need copy relocs or are not
1291 dynamic. */
1292
1293 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1294 && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1295 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1296 || (htab->elf.dynamic_sections_created
1297 && (h->root.type == bfd_link_hash_undefweak
1298 || h->root.type == bfd_link_hash_undefined))))
1299 {
1300 /* Make sure this symbol is output as a dynamic symbol.
1301 Undefined weak syms won't yet be marked as dynamic. */
1302 if (h->dynindx == -1
1303 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1304 {
1305 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
1306 return false;
1307 }
1308
1309 /* If that succeeded, we know we'll be keeping all the
1310 relocs. */
1311 if (h->dynindx != -1)
1312 goto keep;
1313 }
1314
1315 eh->dyn_relocs = NULL;
1316
ec338859 1317 keep: ;
0451c93c
MS		 1318 }
1319
1320 /* Finally, allocate space. */
1321 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1322 {
1323 asection *sreloc = elf_section_data (p->sec)->sreloc;
1324 sreloc->_raw_size += p->count * sizeof (Elf64_External_Rela);
1325 }
1326
1327 return true;
1328}
1329
1330/* Find any dynamic relocs that apply to read-only sections. */
1331
1332static boolean
1333readonly_dynrelocs (h, inf)
1334 struct elf_link_hash_entry *h;
1335 PTR inf;
1336{
1337 struct elf_s390_link_hash_entry *eh;
1338 struct elf_s390_dyn_relocs *p;
1339
e92d460e
AM		 1340 if (h->root.type == bfd_link_hash_warning)
1341 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1342
0451c93c
MS		 1343 eh = (struct elf_s390_link_hash_entry *) h;
1344 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1345 {
1346 asection *s = p->sec->output_section;
1347
1348 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1349 {
1350 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1351
1352 info->flags |= DF_TEXTREL;
1353
1354 /* Not an error, just cut short the traversal. */
1355 return false;
1356 }
1357 }
1358 return true;
1359}
1360
a85d7ed0
NC		 1361/* Set the sizes of the dynamic sections. */
1362
1363static boolean
1364elf_s390_size_dynamic_sections (output_bfd, info)
29c2fb7c 1365 bfd *output_bfd ATTRIBUTE_UNUSED;
a85d7ed0
NC		 1366 struct bfd_link_info *info;
1367{
0451c93c 1368 struct elf_s390_link_hash_table *htab;
a85d7ed0
NC		 1369 bfd *dynobj;
1370 asection *s;
a85d7ed0 1371 boolean relocs;
0451c93c 1372 bfd *ibfd;
a85d7ed0 1373
0451c93c
MS		 1374 htab = elf_s390_hash_table (info);
1375 dynobj = htab->elf.dynobj;
1376 if (dynobj == NULL)
1377 abort ();
a85d7ed0 1378
0451c93c 1379 if (htab->elf.dynamic_sections_created)
a85d7ed0
NC		 1380 {
1381 /* Set the contents of the .interp section to the interpreter. */
1382 if (! info->shared)
1383 {
1384 s = bfd_get_section_by_name (dynobj, ".interp");
0451c93c
MS		 1385 if (s == NULL)
1386 abort ();
a85d7ed0
NC		 1387 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1388 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1389 }
1390 }
a85d7ed0 1391
0451c93c
MS		 1392 /* Set up .got offsets for local syms, and space for local dynamic
1393 relocs. */
1394 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
a85d7ed0 1395 {
0451c93c
MS		 1396 bfd_signed_vma *local_got;
1397 bfd_signed_vma *end_local_got;
1398 bfd_size_type locsymcount;
1399 Elf_Internal_Shdr *symtab_hdr;
1400 asection *srela;
a85d7ed0 1401
0451c93c 1402 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
a85d7ed0
NC		 1403 continue;
1404
0451c93c 1405 for (s = ibfd->sections; s != NULL; s = s->next)
a85d7ed0 1406 {
ec338859 1407 struct elf_s390_dyn_relocs *p;
0451c93c 1408
ec338859
AM		 1409 for (p = *((struct elf_s390_dyn_relocs **)
1410 &elf_section_data (s)->local_dynrel);
1411 p != NULL;
1412 p = p->next)
a85d7ed0 1413 {
ec338859
AM		 1414 if (!bfd_is_abs_section (p->sec)
1415 && bfd_is_abs_section (p->sec->output_section))
1416 {
1417 /* Input section has been discarded, either because
1418 it is a copy of a linkonce section or due to
1419 linker script /DISCARD/, so we'll be discarding
1420 the relocs too. */
1421 }
248866a8 1422 else if (p->count != 0)
ec338859
AM		 1423 {
1424 srela = elf_section_data (p->sec)->sreloc;
1425 srela->_raw_size += p->count * sizeof (Elf64_External_Rela);
248866a8
AM		 1426 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1427 info->flags |= DF_TEXTREL;
ec338859 1428 }
a85d7ed0
NC		 1429 }
1430 }
0451c93c
MS		 1431
1432 local_got = elf_local_got_refcounts (ibfd);
1433 if (!local_got)
1434 continue;
1435
1436 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1437 locsymcount = symtab_hdr->sh_info;
1438 end_local_got = local_got + locsymcount;
1439 s = htab->sgot;
1440 srela = htab->srelgot;
1441 for (; local_got < end_local_got; ++local_got)
a85d7ed0 1442 {
0451c93c 1443 if (*local_got > 0)
a85d7ed0 1444 {
0451c93c
MS		 1445 *local_got = s->_raw_size;
1446 s->_raw_size += GOT_ENTRY_SIZE;
1447 if (info->shared)
1448 srela->_raw_size += sizeof (Elf64_External_Rela);
a85d7ed0
NC		 1449 }
1450 else
0451c93c 1451 *local_got = (bfd_vma) -1;
a85d7ed0 1452 }
0451c93c
MS		 1453 }
1454
1455 /* Allocate global sym .plt and .got entries, and space for global
1456 sym dynamic relocs. */
1457 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1458
1459 /* We now have determined the sizes of the various dynamic sections.
1460 Allocate memory for them. */
1461 relocs = false;
1462 for (s = dynobj->sections; s != NULL; s = s->next)
1463 {
1464 if ((s->flags & SEC_LINKER_CREATED) == 0)
1465 continue;
1466
1467 if (s == htab->splt
1468 || s == htab->sgot
1469 || s == htab->sgotplt)
1470 {
1471 /* Strip this section if we don't need it; see the
1472 comment below. */
1473 }
1474 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
1475 {
1476 if (s->_raw_size != 0 && s != htab->srelplt)
1477 relocs = true;
ec338859 1478
0451c93c
MS		 1479 /* We use the reloc_count field as a counter if we need
1480 to copy relocs into the output file. */
1481 s->reloc_count = 0;
1482 }
1483 else
a85d7ed0
NC		 1484 {
1485 /* It's not one of our sections, so don't allocate space. */
1486 continue;
1487 }
1488
0451c93c 1489 if (s->_raw_size == 0)
a85d7ed0 1490 {
0451c93c
MS		 1491 /* If we don't need this section, strip it from the
1492 output file. This is to handle .rela.bss and
1493 .rela.plt. We must create it in
1494 create_dynamic_sections, because it must be created
1495 before the linker maps input sections to output
1496 sections. The linker does that before
1497 adjust_dynamic_symbol is called, and it is that
1498 function which decides whether anything needs to go
1499 into these sections. */
1500
a85d7ed0
NC		 1501 _bfd_strip_section_from_output (info, s);
1502 continue;
1503 }
1504
0451c93c
MS		 1505 /* Allocate memory for the section contents. We use bfd_zalloc
1506 here in case unused entries are not reclaimed before the
1507 section's contents are written out. This should not happen,
1508 but this way if it does, we get a R_390_NONE reloc instead
1509 of garbage. */
1510 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1511 if (s->contents == NULL)
a85d7ed0
NC		 1512 return false;
1513 }
1514
0451c93c 1515 if (htab->elf.dynamic_sections_created)
a85d7ed0
NC		 1516 {
1517 /* Add some entries to the .dynamic section. We fill in the
1518 values later, in elf_s390_finish_dynamic_sections, but we
1519 must add the entries now so that we get the correct size for
1520 the .dynamic section. The DT_DEBUG entry is filled in by the
1521 dynamic linker and used by the debugger. */
dc810e39
AM		 1522#define add_dynamic_entry(TAG, VAL) \
1523 bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1524
a85d7ed0
NC		 1525 if (! info->shared)
1526 {
dc810e39 1527 if (!add_dynamic_entry (DT_DEBUG, 0))
a85d7ed0
NC		 1528 return false;
1529 }
1530
0451c93c 1531 if (htab->splt->_raw_size != 0)
a85d7ed0 1532 {
dc810e39
AM		 1533 if (!add_dynamic_entry (DT_PLTGOT, 0)
1534 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1535 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1536 || !add_dynamic_entry (DT_JMPREL, 0))
a85d7ed0
NC		 1537 return false;
1538 }
1539
1540 if (relocs)
1541 {
dc810e39
AM		 1542 if (!add_dynamic_entry (DT_RELA, 0)
1543 || !add_dynamic_entry (DT_RELASZ, 0)
1544 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
a85d7ed0 1545 return false;
ec338859 1546
0451c93c
MS		 1547 /* If any dynamic relocs apply to a read-only section,
1548 then we need a DT_TEXTREL entry. */
248866a8
AM		 1549 if ((info->flags & DF_TEXTREL) == 0)
1550 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
1551 (PTR) info);
ec338859 1552
0451c93c
MS		 1553 if ((info->flags & DF_TEXTREL) != 0)
1554 {
1555 if (!add_dynamic_entry (DT_TEXTREL, 0))
1556 return false;
1557 }
a85d7ed0
NC		 1558 }
1559 }
dc810e39 1560#undef add_dynamic_entry
a85d7ed0
NC		 1561
1562 return true;
1563}
1564
a85d7ed0
NC		 1565/* Relocate a 390 ELF section. */
1566
1567static boolean
1568elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
1569 contents, relocs, local_syms, local_sections)
1570 bfd *output_bfd;
1571 struct bfd_link_info *info;
1572 bfd *input_bfd;
1573 asection *input_section;
1574 bfd_byte *contents;
1575 Elf_Internal_Rela *relocs;
1576 Elf_Internal_Sym *local_syms;
1577 asection **local_sections;
1578{
0451c93c 1579 struct elf_s390_link_hash_table *htab;
a85d7ed0
NC		 1580 Elf_Internal_Shdr *symtab_hdr;
1581 struct elf_link_hash_entry **sym_hashes;
1582 bfd_vma *local_got_offsets;
a85d7ed0
NC		 1583 Elf_Internal_Rela *rel;
1584 Elf_Internal_Rela *relend;
1585
b491616a
AM		 1586 if (info->relocateable)
1587 return true;
1588
0451c93c 1589 htab = elf_s390_hash_table (info);
a85d7ed0
NC		 1590 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1591 sym_hashes = elf_sym_hashes (input_bfd);
1592 local_got_offsets = elf_local_got_offsets (input_bfd);
1593
a85d7ed0
NC		 1594 rel = relocs;
1595 relend = relocs + input_section->reloc_count;
1596 for (; rel < relend; rel++)
1597 {
1598 int r_type;
1599 reloc_howto_type *howto;
1600 unsigned long r_symndx;
1601 struct elf_link_hash_entry *h;
1602 Elf_Internal_Sym *sym;
1603 asection *sec;
0451c93c 1604 bfd_vma off;
a85d7ed0 1605 bfd_vma relocation;
0451c93c 1606 boolean unresolved_reloc;
a85d7ed0
NC		 1607 bfd_reloc_status_type r;
1608
1609 r_type = ELF64_R_TYPE (rel->r_info);
0451c93c
MS		 1610 if (r_type == (int) R_390_GNU_VTINHERIT
1611 || r_type == (int) R_390_GNU_VTENTRY)
a85d7ed0
NC		 1612 continue;
1613 if (r_type < 0 || r_type >= (int) R_390_max)
1614 {
1615 bfd_set_error (bfd_error_bad_value);
1616 return false;
1617 }
a85d7ed0 1618
b491616a 1619 howto = elf_howto_table + r_type;
a85d7ed0 1620 r_symndx = ELF64_R_SYM (rel->r_info);
a85d7ed0
NC		 1621 h = NULL;
1622 sym = NULL;
1623 sec = NULL;
0451c93c 1624 unresolved_reloc = false;
a85d7ed0
NC		 1625 if (r_symndx < symtab_hdr->sh_info)
1626 {
1627 sym = local_syms + r_symndx;
1628 sec = local_sections[r_symndx];
f8df10f4 1629 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
a85d7ed0
NC		 1630 }
1631 else
1632 {
1633 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1634 while (h->root.type == bfd_link_hash_indirect
1635 || h->root.type == bfd_link_hash_warning)
1636 h = (struct elf_link_hash_entry *) h->root.u.i.link;
0451c93c 1637
a85d7ed0
NC		 1638 if (h->root.type == bfd_link_hash_defined
1639 || h->root.type == bfd_link_hash_defweak)
1640 {
1641 sec = h->root.u.def.section;
27018c3f 1642 if (sec->output_section == NULL)
a85d7ed0 1643 {
0451c93c
MS		 1644 /* Set a flag that will be cleared later if we find a
1645 relocation value for this symbol. output_section
1646 is typically NULL for symbols satisfied by a shared
1647 library. */
1648 unresolved_reloc = true;
a85d7ed0
NC		 1649 relocation = 0;
1650 }
1651 else
1652 relocation = (h->root.u.def.value
1653 + sec->output_section->vma
1654 + sec->output_offset);
1655 }
1656 else if (h->root.type == bfd_link_hash_undefweak)
1657 relocation = 0;
671bae9c
NC		 1658 else if (info->shared
1659 && (!info->symbolic || info->allow_shlib_undefined)
a85d7ed0
NC		 1660 && !info->no_undefined
1661 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1662 relocation = 0;
1663 else
1664 {
1665 if (! ((*info->callbacks->undefined_symbol)
1666 (info, h->root.root.string, input_bfd,
0451c93c
MS		 1667 input_section, rel->r_offset,
1668 (!info->shared || info->no_undefined
1669 || ELF_ST_VISIBILITY (h->other)))))
a85d7ed0
NC		 1670 return false;
1671 relocation = 0;
1672 }
1673 }
1674
1675 switch (r_type)
1676 {
1677 case R_390_GOT12:
1678 case R_390_GOT16:
1679 case R_390_GOT32:
1680 case R_390_GOT64:
1681 case R_390_GOTENT:
1682 /* Relocation is to the entry for this symbol in the global
1683 offset table. */
0451c93c
MS		 1684 if (htab->sgot == NULL)
1685 abort ();
a85d7ed0
NC		 1686
1687 if (h != NULL)
1688 {
0451c93c 1689 boolean dyn;
a85d7ed0
NC		 1690
1691 off = h->got.offset;
0451c93c
MS		 1692 dyn = htab->elf.dynamic_sections_created;
1693 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)
a85d7ed0 1694 || (info->shared
0451c93c
MS		 1695 && (info->symbolic
1696 || h->dynindx == -1
1697 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
a85d7ed0
NC		 1698 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1699 {
1700 /* This is actually a static link, or it is a
1701 -Bsymbolic link and the symbol is defined
1702 locally, or the symbol was forced to be local
1703 because of a version file. We must initialize
1704 this entry in the global offset table. Since the
1705 offset must always be a multiple of 2, we use the
1706 least significant bit to record whether we have
1707 initialized it already.
1708
1709 When doing a dynamic link, we create a .rel.got
1710 relocation entry to initialize the value. This
1711 is done in the finish_dynamic_symbol routine. */
1712 if ((off & 1) != 0)
1713 off &= ~1;
1714 else
1715 {
1716 bfd_put_64 (output_bfd, relocation,
0451c93c 1717 htab->sgot->contents + off);
a85d7ed0
NC		 1718 h->got.offset |= 1;
1719 }
1720 }
0451c93c
MS		 1721 else
1722 unresolved_reloc = false;
a85d7ed0
NC		 1723 }
1724 else
1725 {
0451c93c
MS		 1726 if (local_got_offsets == NULL)
1727 abort ();
a85d7ed0
NC		 1728
1729 off = local_got_offsets[r_symndx];
1730
1731 /* The offset must always be a multiple of 8. We use
1732 the least significant bit to record whether we have
1733 already generated the necessary reloc. */
1734 if ((off & 1) != 0)
1735 off &= ~1;
1736 else
1737 {
0451c93c
MS		 1738 bfd_put_64 (output_bfd, relocation,
1739 htab->sgot->contents + off);
a85d7ed0
NC		 1740
1741 if (info->shared)
1742 {
1743 asection *srelgot;
1744 Elf_Internal_Rela outrel;
0451c93c 1745 Elf64_External_Rela *loc;
a85d7ed0 1746
0451c93c
MS		 1747 srelgot = htab->srelgot;
1748 if (srelgot == NULL)
1749 abort ();
a85d7ed0 1750
0451c93c
MS		 1751 outrel.r_offset = (htab->sgot->output_section->vma
1752 + htab->sgot->output_offset
a85d7ed0
NC		 1753 + off);
1754 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
1755 outrel.r_addend = relocation;
0451c93c
MS		 1756 loc = (Elf64_External_Rela *) srelgot->contents;
1757 loc += srelgot->reloc_count++;
1758 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
a85d7ed0
NC		 1759 }
1760
1761 local_got_offsets[r_symndx] |= 1;
1762 }
a85d7ed0
NC		 1763 }
1764
0451c93c
MS		 1765 if (off >= (bfd_vma) -2)
1766 abort ();
1767
1768 relocation = htab->sgot->output_offset + off;
1769
a85d7ed0
NC		 1770 /*
1771 * For @GOTENT the relocation is against the offset between
1772 * the instruction and the symbols entry in the GOT and not
1773 * between the start of the GOT and the symbols entry. We
1774 * add the vma of the GOT to get the correct value.
1775 */
1776 if (r_type == R_390_GOTENT)
0451c93c 1777 relocation += htab->sgot->output_section->vma;
a85d7ed0
NC		 1778
1779 break;
99c79b2e 1780
a85d7ed0
NC		 1781 case R_390_GOTOFF:
1782 /* Relocation is relative to the start of the global offset
1783 table. */
1784
a85d7ed0
NC		 1785 /* Note that sgot->output_offset is not involved in this
1786 calculation. We always want the start of .got. If we
1787 defined _GLOBAL_OFFSET_TABLE in a different way, as is
1788 permitted by the ABI, we might have to change this
1789 calculation. */
0451c93c 1790 relocation -= htab->sgot->output_section->vma;
a85d7ed0
NC		 1791
1792 break;
1793
1794 case R_390_GOTPC:
1795 case R_390_GOTPCDBL:
1796 /* Use global offset table as symbol value. */
0451c93c
MS		 1797 relocation = htab->sgot->output_section->vma;
1798 unresolved_reloc = false;
1799 break;
a85d7ed0
NC		 1800
1801 case R_390_PLT16DBL:
1802 case R_390_PLT32:
1803 case R_390_PLT32DBL:
1804 case R_390_PLT64:
1805 /* Relocation is to the entry for this symbol in the
1806 procedure linkage table. */
1807
1808 /* Resolve a PLT32 reloc against a local symbol directly,
1809 without using the procedure linkage table. */
1810 if (h == NULL)
1811 break;
1812
0451c93c
MS		 1813 if (h->plt.offset == (bfd_vma) -1
1814 || htab->splt == NULL)
a85d7ed0
NC		 1815 {
1816 /* We didn't make a PLT entry for this symbol. This
1817 happens when statically linking PIC code, or when
1818 using -Bsymbolic. */
1819 break;
1820 }
1821
0451c93c
MS		 1822 relocation = (htab->splt->output_section->vma
1823 + htab->splt->output_offset
a85d7ed0 1824 + h->plt.offset);
0451c93c 1825 unresolved_reloc = false;
a85d7ed0
NC		 1826 break;
1827
1828 case R_390_8:
1829 case R_390_16:
1830 case R_390_32:
1831 case R_390_64:
1832 case R_390_PC16:
1833 case R_390_PC16DBL:
1834 case R_390_PC32:
1835 case R_390_PC32DBL:
1836 case R_390_PC64:
ec338859
AM		 1837 /* r_symndx will be zero only for relocs against symbols
1838 from removed linkonce sections, or sections discarded by
1839 a linker script. */
1840 if (r_symndx == 0
1841 || (input_section->flags & SEC_ALLOC) == 0)
1842 break;
1843
0451c93c 1844 if ((info->shared
0451c93c
MS		 1845 && ((r_type != R_390_PC16
1846 && r_type != R_390_PC16DBL
1847 && r_type != R_390_PC32
1848 && r_type != R_390_PC32DBL
1849 && r_type != R_390_PC64)
1850 || (h != NULL
1851 && h->dynindx != -1
1852 && (! info->symbolic
1853 || (h->elf_link_hash_flags
1854 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1855 || (!info->shared
0451c93c
MS		 1856 && h != NULL
1857 && h->dynindx != -1
1858 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1859 && (((h->elf_link_hash_flags
1860 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1861 && (h->elf_link_hash_flags
1862 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1863 || h->root.type == bfd_link_hash_undefweak
1864 || h->root.type == bfd_link_hash_undefined)))
a85d7ed0
NC		 1865 {
1866 Elf_Internal_Rela outrel;
1867 boolean skip, relocate;
0451c93c
MS		 1868 asection *sreloc;
1869 Elf64_External_Rela *loc;
a85d7ed0
NC		 1870
1871 /* When generating a shared object, these relocations
1872 are copied into the output file to be resolved at run
1873 time. */
1874
a85d7ed0 1875 skip = false;
0bb2d96a 1876 relocate = false;
a85d7ed0 1877
c629eae0
JJ		 1878 outrel.r_offset =
1879 _bfd_elf_section_offset (output_bfd, info, input_section,
1880 rel->r_offset);
1881 if (outrel.r_offset == (bfd_vma) -1)
1882 skip = true;
0bb2d96a
JJ		 1883 else if (outrel.r_offset == (bfd_vma) -2)
1884 skip = true, relocate = true;
a85d7ed0
NC		 1885
1886 outrel.r_offset += (input_section->output_section->vma
1887 + input_section->output_offset);
1888
1889 if (skip)
0bb2d96a 1890 memset (&outrel, 0, sizeof outrel);
0451c93c
MS		 1891 else if (h != NULL
1892 && h->dynindx != -1
1893 && (r_type == R_390_PC16
1894 || r_type == R_390_PC16DBL
1895 || r_type == R_390_PC32
1896 || r_type == R_390_PC32DBL
1897 || r_type == R_390_PC64
1898 || !info->shared
1899 || !info->symbolic
1900 || (h->elf_link_hash_flags
1901 & ELF_LINK_HASH_DEF_REGULAR) == 0))
a85d7ed0 1902 {
a85d7ed0 1903 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
27018c3f 1904 outrel.r_addend = rel->r_addend;
a85d7ed0
NC		 1905 }
1906 else
1907 {
0451c93c
MS		 1908 /* This symbol is local, or marked to become local. */
1909 relocate = true;
1910 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
1911 outrel.r_addend = relocation + rel->r_addend;
1912 }
a85d7ed0 1913
0451c93c
MS		 1914 sreloc = elf_section_data (input_section)->sreloc;
1915 if (sreloc == NULL)
1916 abort ();
1917
1918 loc = (Elf64_External_Rela *) sreloc->contents;
1919 loc += sreloc->reloc_count++;
1920 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
a85d7ed0
NC		 1921
1922 /* If this reloc is against an external symbol, we do
1923 not want to fiddle with the addend. Otherwise, we
1924 need to include the symbol value so that it becomes
1925 an addend for the dynamic reloc. */
1926 if (! relocate)
1927 continue;
1928 }
1929
1930 break;
1931
1932 default:
1933 break;
1934 }
1935
239e1f3a
AM		 1936 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
1937 because such sections are not SEC_ALLOC and thus ld.so will
1938 not process them. */
0451c93c 1939 if (unresolved_reloc
239e1f3a 1940 && !((input_section->flags & SEC_DEBUGGING) != 0
0451c93c
MS		 1941 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
1942 (*_bfd_error_handler)
1943 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
1944 bfd_archive_filename (input_bfd),
1945 bfd_get_section_name (input_bfd, input_section),
1946 (long) rel->r_offset,
1947 h->root.root.string);
1948
a85d7ed0
NC		 1949 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1950 contents, rel->r_offset,
1951 relocation, rel->r_addend);
1952
1953 if (r != bfd_reloc_ok)
1954 {
0451c93c 1955 const char *name;
ec338859 1956
0451c93c
MS		 1957 if (h != NULL)
1958 name = h->root.root.string;
1959 else
a85d7ed0 1960 {
0451c93c
MS		 1961 name = bfd_elf_string_from_elf_section (input_bfd,
1962 symtab_hdr->sh_link,
1963 sym->st_name);
1964 if (name == NULL)
1965 return false;
1966 if (*name == '\0')
1967 name = bfd_section_name (input_bfd, sec);
1968 }
ec338859 1969
0451c93c
MS		 1970 if (r == bfd_reloc_overflow)
1971 {
ec338859 1972
0451c93c
MS		 1973 if (! ((*info->callbacks->reloc_overflow)
1974 (info, name, howto->name, (bfd_vma) 0,
1975 input_bfd, input_section, rel->r_offset)))
1976 return false;
1977 }
1978 else
1979 {
1980 (*_bfd_error_handler)
1981 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
1982 bfd_archive_filename (input_bfd),
1983 bfd_get_section_name (input_bfd, input_section),
1984 (long) rel->r_offset, name, (int) r);
1985 return false;
a85d7ed0
NC		 1986 }
1987 }
1988 }
1989
1990 return true;
1991}
1992
1993/* Finish up dynamic symbol handling. We set the contents of various
1994 dynamic sections here. */
1995
1996static boolean
1997elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
1998 bfd *output_bfd;
1999 struct bfd_link_info *info;
2000 struct elf_link_hash_entry *h;
2001 Elf_Internal_Sym *sym;
2002{
0451c93c 2003 struct elf_s390_link_hash_table *htab;
a85d7ed0 2004
0451c93c 2005 htab = elf_s390_hash_table (info);
a85d7ed0
NC		 2006
2007 if (h->plt.offset != (bfd_vma) -1)
2008 {
a85d7ed0 2009 bfd_vma plt_index;
0451c93c
MS		 2010 bfd_vma got_offset;
2011 Elf_Internal_Rela rela;
2012 Elf64_External_Rela *loc;
a85d7ed0
NC		 2013
2014 /* This symbol has an entry in the procedure linkage table. Set
2015 it up. */
2016
0451c93c
MS		 2017 if (h->dynindx == -1
2018 || htab->splt == NULL
2019 || htab->sgotplt == NULL
2020 || htab->srelplt == NULL)
2021 abort ();
a85d7ed0 2022
99c79b2e 2023 /* Calc. index no.
a85d7ed0
NC		 2024 Current offset - size first entry / entry size. */
2025 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
2026
2027 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
2028 addr & GOT addr. */
2029 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
2030
2031 /* Fill in the blueprint of a PLT. */
0451c93c
MS		 2032 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
2033 htab->splt->contents + h->plt.offset);
2034 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
2035 htab->splt->contents + h->plt.offset + 4);
2036 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
2037 htab->splt->contents + h->plt.offset + 8);
2038 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
2039 htab->splt->contents + h->plt.offset + 12);
2040 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
2041 htab->splt->contents + h->plt.offset + 16);
2042 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5,
2043 htab->splt->contents + h->plt.offset + 20);
2044 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6,
2045 htab->splt->contents + h->plt.offset + 24);
2046 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7,
2047 htab->splt->contents + h->plt.offset + 28);
a85d7ed0
NC		 2048 /* Fixup the relative address to the GOT entry */
2049 bfd_put_32 (output_bfd,
0451c93c
MS		 2050 (htab->sgotplt->output_section->vma +
2051 htab->sgotplt->output_offset + got_offset
2052 - (htab->splt->output_section->vma + h->plt.offset))/2,
2053 htab->splt->contents + h->plt.offset + 2);
a85d7ed0
NC		 2054 /* Fixup the relative branch to PLT 0 */
2055 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
2056 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
0451c93c 2057 htab->splt->contents + h->plt.offset + 24);
a85d7ed0
NC		 2058 /* Fixup offset into symbol table */
2059 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
0451c93c 2060 htab->splt->contents + h->plt.offset + 28);
a85d7ed0
NC		 2061
2062 /* Fill in the entry in the global offset table.
2063 Points to instruction after GOT offset. */
2064 bfd_put_64 (output_bfd,
0451c93c
MS		 2065 (htab->splt->output_section->vma
2066 + htab->splt->output_offset
a85d7ed0
NC		 2067 + h->plt.offset
2068 + 14),
0451c93c 2069 htab->sgotplt->contents + got_offset);
a85d7ed0 2070
0451c93c
MS		 2071 /* Fill in the entry in the .rela.plt section. */
2072 rela.r_offset = (htab->sgotplt->output_section->vma
2073 + htab->sgotplt->output_offset
2074 + got_offset);
2075 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
2076 rela.r_addend = 0;
2077 loc = (Elf64_External_Rela *) htab->srelplt->contents + plt_index;
2078 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
a85d7ed0
NC		 2079
2080 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2081 {
2082 /* Mark the symbol as undefined, rather than as defined in
0451c93c
MS		 2083 the .plt section. Leave the value alone. This is a clue
2084 for the dynamic linker, to make function pointer
2085 comparisons work between an application and shared
2086 library. */
a85d7ed0
NC		 2087 sym->st_shndx = SHN_UNDEF;
2088 }
2089 }
2090
2091 if (h->got.offset != (bfd_vma) -1)
2092 {
a85d7ed0 2093 Elf_Internal_Rela rela;
0451c93c 2094 Elf64_External_Rela *loc;
a85d7ed0
NC		 2095
2096 /* This symbol has an entry in the global offset table. Set it
2097 up. */
2098
0451c93c
MS		 2099 if (htab->sgot == NULL || htab->srelgot == NULL)
2100 abort ();
a85d7ed0 2101
0451c93c
MS		 2102 rela.r_offset = (htab->sgot->output_section->vma
2103 + htab->sgot->output_offset
dc810e39 2104 + (h->got.offset &~ (bfd_vma) 1));
a85d7ed0
NC		 2105
2106 /* If this is a static link, or it is a -Bsymbolic link and the
2107 symbol is defined locally or was forced to be local because
2108 of a version file, we just want to emit a RELATIVE reloc.
2109 The entry in the global offset table will already have been
2110 initialized in the relocate_section function. */
0451c93c
MS		 2111 if (info->shared
2112 && (info->symbolic
2113 || h->dynindx == -1
2114 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
2115 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
a85d7ed0 2116 {
0451c93c 2117 BFD_ASSERT((h->got.offset & 1) != 0);
a85d7ed0
NC		 2118 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2119 rela.r_addend = (h->root.u.def.value
2120 + h->root.u.def.section->output_section->vma
2121 + h->root.u.def.section->output_offset);
2122 }
2123 else
2124 {
2125 BFD_ASSERT((h->got.offset & 1) == 0);
0451c93c 2126 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
a85d7ed0
NC		 2127 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
2128 rela.r_addend = 0;
2129 }
2130
0451c93c
MS		 2131 loc = (Elf64_External_Rela *) htab->srelgot->contents;
2132 loc += htab->srelgot->reloc_count++;
2133 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
a85d7ed0
NC		 2134 }
2135
2136 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
2137 {
a85d7ed0 2138 Elf_Internal_Rela rela;
0451c93c 2139 Elf64_External_Rela *loc;
a85d7ed0
NC		 2140
2141 /* This symbols needs a copy reloc. Set it up. */
2142
0451c93c
MS		 2143 if (h->dynindx == -1
2144 || (h->root.type != bfd_link_hash_defined
2145 && h->root.type != bfd_link_hash_defweak)
2146 || htab->srelbss == NULL)
2147 abort ();
a85d7ed0
NC		 2148
2149 rela.r_offset = (h->root.u.def.value
2150 + h->root.u.def.section->output_section->vma
2151 + h->root.u.def.section->output_offset);
2152 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
2153 rela.r_addend = 0;
0451c93c
MS		 2154 loc = (Elf64_External_Rela *) htab->srelbss->contents;
2155 loc += htab->srelbss->reloc_count++;
2156 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
a85d7ed0
NC		 2157 }
2158
2159 /* Mark some specially defined symbols as absolute. */
2160 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2161 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
2162 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
2163 sym->st_shndx = SHN_ABS;
2164
2165 return true;
2166}
2167
0451c93c
MS		 2168/* Used to decide how to sort relocs in an optimal manner for the
2169 dynamic linker, before writing them out. */
2170
2171static enum elf_reloc_type_class
2172elf_s390_reloc_type_class (rela)
2173 const Elf_Internal_Rela *rela;
2174{
2175 switch ((int) ELF64_R_TYPE (rela->r_info))
2176 {
2177 case R_390_RELATIVE:
2178 return reloc_class_relative;
2179 case R_390_JMP_SLOT:
2180 return reloc_class_plt;
2181 case R_390_COPY:
2182 return reloc_class_copy;
2183 default:
2184 return reloc_class_normal;
2185 }
2186}
2187
a85d7ed0
NC		 2188/* Finish up the dynamic sections. */
2189
2190static boolean
2191elf_s390_finish_dynamic_sections (output_bfd, info)
2192 bfd *output_bfd;
2193 struct bfd_link_info *info;
2194{
0451c93c 2195 struct elf_s390_link_hash_table *htab;
a85d7ed0
NC		 2196 bfd *dynobj;
2197 asection *sdyn;
a85d7ed0 2198
0451c93c
MS		 2199 htab = elf_s390_hash_table (info);
2200 dynobj = htab->elf.dynobj;
a85d7ed0
NC		 2201 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2202
0451c93c 2203 if (htab->elf.dynamic_sections_created)
a85d7ed0 2204 {
a85d7ed0
NC		 2205 Elf64_External_Dyn *dyncon, *dynconend;
2206
0451c93c
MS		 2207 if (sdyn == NULL || htab->sgot == NULL)
2208 abort ();
a85d7ed0
NC		 2209
2210 dyncon = (Elf64_External_Dyn *) sdyn->contents;
2211 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2212 for (; dyncon < dynconend; dyncon++)
2213 {
2214 Elf_Internal_Dyn dyn;
a85d7ed0 2215 asection *s;
ec338859 2216
a85d7ed0 2217 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
ec338859 2218
a85d7ed0
NC		 2219 switch (dyn.d_tag)
2220 {
2221 default:
0451c93c 2222 continue;
ec338859 2223
a85d7ed0 2224 case DT_PLTGOT:
0451c93c
MS		 2225 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
2226 break;
ec338859 2227
a85d7ed0 2228 case DT_JMPREL:
0451c93c 2229 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
a85d7ed0 2230 break;
ec338859 2231
a85d7ed0 2232 case DT_PLTRELSZ:
0451c93c 2233 s = htab->srelplt->output_section;
a85d7ed0
NC		 2234 if (s->_cooked_size != 0)
2235 dyn.d_un.d_val = s->_cooked_size;
2236 else
2237 dyn.d_un.d_val = s->_raw_size;
a85d7ed0 2238 break;
ec338859 2239
a85d7ed0
NC		 2240 case DT_RELASZ:
2241 /* The procedure linkage table relocs (DT_JMPREL) should
2242 not be included in the overall relocs (DT_RELA).
2243 Therefore, we override the DT_RELASZ entry here to
2244 make it not include the JMPREL relocs. Since the
2245 linker script arranges for .rela.plt to follow all
2246 other relocation sections, we don't have to worry
2247 about changing the DT_RELA entry. */
0451c93c
MS		 2248 s = htab->srelplt->output_section;
2249 if (s->_cooked_size != 0)
2250 dyn.d_un.d_val -= s->_cooked_size;
2251 else
2252 dyn.d_un.d_val -= s->_raw_size;
a85d7ed0
NC		 2253 break;
2254 }
0451c93c
MS		 2255
2256 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
a85d7ed0
NC		 2257 }
2258
2259 /* Fill in the special first entry in the procedure linkage table. */
0451c93c 2260 if (htab->splt && htab->splt->_raw_size > 0)
a85d7ed0
NC		 2261 {
2262 /* fill in blueprint for plt 0 entry */
0451c93c
MS		 2263 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0,
2264 htab->splt->contents );
2265 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
2266 htab->splt->contents +4 );
2267 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
2268 htab->splt->contents +12 );
2269 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
2270 htab->splt->contents +16 );
2271 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
2272 htab->splt->contents +20 );
2273 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6,
2274 htab->splt->contents + 24);
2275 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7,
2276 htab->splt->contents + 28 );
a85d7ed0
NC		 2277 /* Fixup relative address to start of GOT */
2278 bfd_put_32 (output_bfd,
0451c93c
MS		 2279 (htab->sgotplt->output_section->vma +
2280 htab->sgotplt->output_offset
2281 - htab->splt->output_section->vma - 6)/2,
2282 htab->splt->contents + 8);
a85d7ed0 2283 }
0451c93c
MS		 2284 elf_section_data (htab->splt->output_section)
2285 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE;
a85d7ed0
NC		 2286 }
2287
0451c93c 2288 if (htab->sgotplt)
a85d7ed0 2289 {
0451c93c
MS		 2290 /* Fill in the first three entries in the global offset table. */
2291 if (htab->sgotplt->_raw_size > 0)
2292 {
2293 bfd_put_64 (output_bfd,
2294 (sdyn == NULL ? (bfd_vma) 0
2295 : sdyn->output_section->vma + sdyn->output_offset),
2296 htab->sgotplt->contents);
2297 /* One entry for shared object struct ptr. */
2298 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
2299 /* One entry for _dl_runtime_resolve. */
2300 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12);
2301 }
a85d7ed0 2302
0451c93c
MS		 2303 elf_section_data (htab->sgot->output_section)
2304 ->this_hdr.sh_entsize = 8;
2305 }
a85d7ed0
NC		 2306 return true;
2307}
2308
2309static boolean
2310elf_s390_object_p (abfd)
2311 bfd *abfd;
2312{
befc3abb 2313 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
a85d7ed0
NC		 2314}
2315
2316/*
2317 * Why was the hash table entry size definition changed from
2318 * ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
2319 * this is the only reason for the s390_elf64_size_info structure.
2320 */
2321
2322const struct elf_size_info s390_elf64_size_info =
2323{
2324 sizeof (Elf64_External_Ehdr),
2325 sizeof (Elf64_External_Phdr),
2326 sizeof (Elf64_External_Shdr),
2327 sizeof (Elf64_External_Rel),
2328 sizeof (Elf64_External_Rela),
2329 sizeof (Elf64_External_Sym),
2330 sizeof (Elf64_External_Dyn),
2331 sizeof (Elf_External_Note),
2332 8, /* hash-table entry size */
2333 1, /* internal relocations per external relocations */
2334 64, /* arch_size */
2335 8, /* file_align */
2336 ELFCLASS64, EV_CURRENT,
2337 bfd_elf64_write_out_phdrs,
2338 bfd_elf64_write_shdrs_and_ehdr,
2339 bfd_elf64_write_relocs,
73ff0d56 2340 bfd_elf64_swap_symbol_in,
a85d7ed0
NC		 2341 bfd_elf64_swap_symbol_out,
2342 bfd_elf64_slurp_reloc_table,
2343 bfd_elf64_slurp_symbol_table,
2344 bfd_elf64_swap_dyn_in,
2345 bfd_elf64_swap_dyn_out,
2346 NULL,
2347 NULL,
2348 NULL,
2349 NULL
2350};
2351
2352#define TARGET_BIG_SYM bfd_elf64_s390_vec
2353#define TARGET_BIG_NAME "elf64-s390"
2354#define ELF_ARCH bfd_arch_s390
2355#define ELF_MACHINE_CODE EM_S390
2356#define ELF_MACHINE_ALT1 EM_S390_OLD
2357#define ELF_MAXPAGESIZE 0x1000
2358
2359#define elf_backend_size_info s390_elf64_size_info
2360
2361#define elf_backend_can_gc_sections 1
51b64d56 2362#define elf_backend_can_refcount 1
a85d7ed0
NC		 2363#define elf_backend_want_got_plt 1
2364#define elf_backend_plt_readonly 1
2365#define elf_backend_want_plt_sym 0
2366#define elf_backend_got_header_size 24
2367#define elf_backend_plt_header_size PLT_ENTRY_SIZE
b491616a 2368#define elf_backend_rela_normal 1
a85d7ed0
NC		 2369
2370#define elf_info_to_howto elf_s390_info_to_howto
2371
a85d7ed0
NC		 2372#define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
2373#define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
2374#define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
2375
2376#define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
2377#define elf_backend_check_relocs elf_s390_check_relocs
0451c93c
MS		 2378#define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
2379#define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
a85d7ed0
NC		 2380#define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
2381#define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
2382#define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
2383#define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
0451c93c 2384#define elf_backend_reloc_type_class elf_s390_reloc_type_class
a85d7ed0
NC		 2385#define elf_backend_relocate_section elf_s390_relocate_section
2386#define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
29c2fb7c 2387#define elf_backend_reloc_type_class elf_s390_reloc_type_class
a85d7ed0
NC		 2388
2389#define elf_backend_object_p elf_s390_object_p
2390
2391#include "elf64-target.h"
GDB Binutils - Deliverables
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