?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Touches most files in bfd/, so likely will be blamed for everything..
[binutils.git] / bfd / elf64-s390.c
blob65041a6357a76d24eb720e0fb0b1f34d01ae86bd
1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright 2000, 2001 Free Software Foundation, Inc.
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
28 static reloc_howto_type *elf_s390_reloc_type_lookup
29 PARAMS ((bfd *, bfd_reloc_code_real_type));
30 static void elf_s390_info_to_howto
31 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
32 static boolean elf_s390_is_local_label_name PARAMS ((bfd *, const char *));
33 static struct bfd_hash_entry *elf_s390_link_hash_newfunc
34 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
35 static struct bfd_link_hash_table *elf_s390_link_hash_table_create
36 PARAMS ((bfd *));
37 static boolean elf_s390_check_relocs
38 PARAMS ((bfd *, struct bfd_link_info *, asection *,
39 const Elf_Internal_Rela *));
40 static asection *elf_s390_gc_mark_hook
41 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
42 struct elf_link_hash_entry *, Elf_Internal_Sym *));
43 static boolean elf_s390_gc_sweep_hook
44 PARAMS ((bfd *, struct bfd_link_info *, asection *,
45 const Elf_Internal_Rela *));
46 static boolean elf_s390_adjust_dynamic_symbol
47 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
48 static boolean elf_s390_size_dynamic_sections
49 PARAMS ((bfd *, struct bfd_link_info *));
50 static boolean elf_s390_relocate_section
51 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
52 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
53 static boolean elf_s390_finish_dynamic_symbol
54 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
55 Elf_Internal_Sym *));
56 static boolean elf_s390_finish_dynamic_sections
57 PARAMS ((bfd *, struct bfd_link_info *));
58 static boolean elf_s390_object_p PARAMS ((bfd *));
59 static enum elf_reloc_type_class elf_s390_reloc_type_class PARAMS ((int));
60
61 #define USE_RELA 1 /* We want RELA relocations, not REL. */
62
63 #include "elf/s390.h"
64
65 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
66 from smaller values. Start with zero, widen, *then* decrement. */
67 #define MINUS_ONE (((bfd_vma)0) - 1)
68
69 /* The relocation "howto" table. */
70 static reloc_howto_type elf_howto_table[] =
71 {
72 HOWTO (R_390_NONE, /* type */
73 0, /* rightshift */
74 0, /* size (0 = byte, 1 = short, 2 = long) */
75 0, /* bitsize */
76 false, /* pc_relative */
77 0, /* bitpos */
78 complain_overflow_dont, /* complain_on_overflow */
79 bfd_elf_generic_reloc, /* special_function */
80 "R_390_NONE", /* name */
81 false, /* partial_inplace */
82 0, /* src_mask */
83 0, /* dst_mask */
84 false), /* pcrel_offset */
85
86 HOWTO(R_390_8, 0, 0, 8, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false),
87 HOWTO(R_390_12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false),
88 HOWTO(R_390_16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false),
89 HOWTO(R_390_32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false),
90 HOWTO(R_390_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true),
91 HOWTO(R_390_GOT12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false),
92 HOWTO(R_390_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false),
93 HOWTO(R_390_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true),
94 HOWTO(R_390_COPY, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_COPY", false, 0,MINUS_ONE, false),
95 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),
96 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),
97 HOWTO(R_390_RELATIVE, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_RELATIVE",false, 0,MINUS_ONE, false),
98 HOWTO(R_390_GOTOFF, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTOFF", false, 0,MINUS_ONE, false),
99 HOWTO(R_390_GOTPC, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,MINUS_ONE, true),
100 HOWTO(R_390_GOT16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false),
101 HOWTO(R_390_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true),
102 HOWTO(R_390_PC16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true),
103 HOWTO(R_390_PLT16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true),
104 HOWTO(R_390_PC32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true),
105 HOWTO(R_390_PLT32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true),
106 HOWTO(R_390_GOTPCDBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPCDBL", false, 0,MINUS_ONE, true),
107 HOWTO(R_390_64, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_64", false, 0,MINUS_ONE, false),
108 HOWTO(R_390_PC64, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC64", false, 0,MINUS_ONE, true),
109 HOWTO(R_390_GOT64, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT64", false, 0,MINUS_ONE, false),
110 HOWTO(R_390_PLT64, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT64", false, 0,MINUS_ONE, true),
111 HOWTO(R_390_GOTENT, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTENT", false, 0,MINUS_ONE, true),
112 };
113
114 /* GNU extension to record C++ vtable hierarchy. */
115 static reloc_howto_type elf64_s390_vtinherit_howto =
116 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false);
117 static reloc_howto_type elf64_s390_vtentry_howto =
118 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);
119
120 static reloc_howto_type *
121 elf_s390_reloc_type_lookup (abfd, code)
122 bfd *abfd ATTRIBUTE_UNUSED;
123 bfd_reloc_code_real_type code;
124 {
125 switch (code) {
126 case BFD_RELOC_NONE:
127 return &elf_howto_table[(int) R_390_NONE];
128 case BFD_RELOC_8:
129 return &elf_howto_table[(int) R_390_8];
130 case BFD_RELOC_390_12:
131 return &elf_howto_table[(int) R_390_12];
132 case BFD_RELOC_16:
133 return &elf_howto_table[(int) R_390_16];
134 case BFD_RELOC_32:
135 return &elf_howto_table[(int) R_390_32];
136 case BFD_RELOC_CTOR:
137 return &elf_howto_table[(int) R_390_32];
138 case BFD_RELOC_32_PCREL:
139 return &elf_howto_table[(int) R_390_PC32];
140 case BFD_RELOC_390_GOT12:
141 return &elf_howto_table[(int) R_390_GOT12];
142 case BFD_RELOC_32_GOT_PCREL:
143 return &elf_howto_table[(int) R_390_GOT32];
144 case BFD_RELOC_390_PLT32:
145 return &elf_howto_table[(int) R_390_PLT32];
146 case BFD_RELOC_390_COPY:
147 return &elf_howto_table[(int) R_390_COPY];
148 case BFD_RELOC_390_GLOB_DAT:
149 return &elf_howto_table[(int) R_390_GLOB_DAT];
150 case BFD_RELOC_390_JMP_SLOT:
151 return &elf_howto_table[(int) R_390_JMP_SLOT];
152 case BFD_RELOC_390_RELATIVE:
153 return &elf_howto_table[(int) R_390_RELATIVE];
154 case BFD_RELOC_32_GOTOFF:
155 return &elf_howto_table[(int) R_390_GOTOFF];
156 case BFD_RELOC_390_GOTPC:
157 return &elf_howto_table[(int) R_390_GOTPC];
158 case BFD_RELOC_390_GOT16:
159 return &elf_howto_table[(int) R_390_GOT16];
160 case BFD_RELOC_16_PCREL:
161 return &elf_howto_table[(int) R_390_PC16];
162 case BFD_RELOC_390_PC16DBL:
163 return &elf_howto_table[(int) R_390_PC16DBL];
164 case BFD_RELOC_390_PLT16DBL:
165 return &elf_howto_table[(int) R_390_PLT16DBL];
166 case BFD_RELOC_VTABLE_INHERIT:
167 return &elf64_s390_vtinherit_howto;
168 case BFD_RELOC_VTABLE_ENTRY:
169 return &elf64_s390_vtentry_howto;
170 case BFD_RELOC_390_PC32DBL:
171 return &elf_howto_table[(int) R_390_PC32DBL];
172 case BFD_RELOC_390_PLT32DBL:
173 return &elf_howto_table[(int) R_390_PLT32DBL];
174 case BFD_RELOC_390_GOTPCDBL:
175 return &elf_howto_table[(int) R_390_GOTPCDBL];
176 case BFD_RELOC_64:
177 return &elf_howto_table[(int) R_390_64];
178 case BFD_RELOC_64_PCREL:
179 return &elf_howto_table[(int) R_390_PC64];
180 case BFD_RELOC_390_GOT64:
181 return &elf_howto_table[(int) R_390_GOT64];
182 case BFD_RELOC_390_PLT64:
183 return &elf_howto_table[(int) R_390_PLT64];
184 case BFD_RELOC_390_GOTENT:
185 return &elf_howto_table[(int) R_390_GOTENT];
186 default:
187 break;
188 }
189 return 0;
190 }
191
192 /* We need to use ELF64_R_TYPE so we have our own copy of this function,
193 and elf64-s390.c has its own copy. */
194
195 static void
196 elf_s390_info_to_howto (abfd, cache_ptr, dst)
197 bfd *abfd ATTRIBUTE_UNUSED;
198 arelent *cache_ptr;
199 Elf_Internal_Rela *dst;
200 {
201 switch (ELF64_R_TYPE(dst->r_info))
202 {
203 case R_390_GNU_VTINHERIT:
204 cache_ptr->howto = &elf64_s390_vtinherit_howto;
205 break;
206
207 case R_390_GNU_VTENTRY:
208 cache_ptr->howto = &elf64_s390_vtentry_howto;
209 break;
210
211 default:
212 BFD_ASSERT (ELF64_R_TYPE(dst->r_info) < (unsigned int) R_390_max);
213 cache_ptr->howto = &elf_howto_table[ELF64_R_TYPE(dst->r_info)];
214 }
215 }
216
217 static boolean
218 elf_s390_is_local_label_name (abfd, name)
219 bfd *abfd;
220 const char *name;
221 {
222 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
223 return true;
224
225 return _bfd_elf_is_local_label_name (abfd, name);
226 }
227
228 /* Functions for the 390 ELF linker. */
229
230 /* The name of the dynamic interpreter. This is put in the .interp
231 section. */
232
233 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
234
235 /* The nop opcode we use. */
236
237 #define s390_NOP 0x07070707
238
239
240 /* The size in bytes of the first entry in the procedure linkage table. */
241 #define PLT_FIRST_ENTRY_SIZE 32
242 /* The size in bytes of an entry in the procedure linkage table. */
243 #define PLT_ENTRY_SIZE 32
244
245 #define GOT_ENTRY_SIZE 8
246
247 /* The first three entries in a procedure linkage table are reserved,
248 and the initial contents are unimportant (we zero them out).
249 Subsequent entries look like this. See the SVR4 ABI 386
250 supplement to see how this works. */
251
252 /* For the s390, simple addr offset can only be 0 - 4096.
253 To use the full 16777216 TB address space, several instructions
254 are needed to load an address in a register and execute
255 a branch( or just saving the address)
256
257 Furthermore, only r 0 and 1 are free to use!!! */
258
259 /* The first 3 words in the GOT are then reserved.
260 Word 0 is the address of the dynamic table.
261 Word 1 is a pointer to a structure describing the object
262 Word 2 is used to point to the loader entry address.
263
264 The code for PLT entries looks like this:
265
266 The GOT holds the address in the PLT to be executed.
267 The loader then gets:
268 24(15) = Pointer to the structure describing the object.
269 28(15) = Offset in symbol table
270 The loader must then find the module where the function is
271 and insert the address in the GOT.
272
273 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
274 LG 1,0(1) # 6 bytes Load address from GOT in r1
275 BCR 15,1 # 2 bytes Jump to address
276 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
277 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1
278 BRCL 15,-x # 6 bytes Jump to start of PLT
279 .long ? # 4 bytes offset into symbol table
280
281 Total = 32 bytes per PLT entry
282 Fixup at offset 2: relative address to GOT entry
283 Fixup at offset 22: relative branch to PLT0
284 Fixup at offset 28: 32 bit offset into symbol table
285
286 A 32 bit offset into the symbol table is enough. It allows for symbol
287 tables up to a size of 2 gigabyte. A single dynamic object (the main
288 program, any shared library) is limited to 4GB in size and I want to see
289 the program that manages to have a symbol table of more than 2 GB with a
290 total size of at max 4 GB. */
291
292 #define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000
293 #define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310
294 #define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004
295 #define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10
296 #define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c
297 #define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4
298 #define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000
299 #define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000
300
301 /* The first PLT entry pushes the offset into the symbol table
302 from R1 onto the stack at 8(15) and the loader object info
303 at 12(15), loads the loader address in R1 and jumps to it. */
304
305 /* The first entry in the PLT:
306
307 PLT0:
308 STG 1,56(15) # r1 contains the offset into the symbol table
309 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
310 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
311 LG 1,16(1) # get entry address of loader
312 BCR 15,1 # jump to loader
313
314 Fixup at offset 8: relative address to start of GOT. */
315
316 #define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038
317 #define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010
318 #define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000
319 #define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030
320 #define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310
321 #define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004
322 #define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700
323 #define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700
324
325 /* The s390 linker needs to keep track of the number of relocs that it
326 decides to copy in check_relocs for each symbol. This is so that
327 it can discard PC relative relocs if it doesn't need them when
328 linking with -Bsymbolic. We store the information in a field
329 extending the regular ELF linker hash table. */
330
331 /* This structure keeps track of the number of PC relative relocs we
332 have copied for a given symbol. */
333
334 struct elf_s390_pcrel_relocs_copied
335 {
336 /* Next section. */
337 struct elf_s390_pcrel_relocs_copied *next;
338 /* A section in dynobj. */
339 asection *section;
340 /* Number of relocs copied in this section. */
341 bfd_size_type count;
342 };
343
344 /* s390 ELF linker hash entry. */
345
346 struct elf_s390_link_hash_entry
347 {
348 struct elf_link_hash_entry root;
349
350 /* Number of PC relative relocs copied for this symbol. */
351 struct elf_s390_pcrel_relocs_copied *pcrel_relocs_copied;
352 };
353
354 /* s390 ELF linker hash table. */
355
356 struct elf_s390_link_hash_table
357 {
358 struct elf_link_hash_table root;
359 };
360
361 /* Declare this now that the above structures are defined. */
362
363 static boolean elf_s390_discard_copies
364 PARAMS ((struct elf_s390_link_hash_entry *, PTR));
365
366 /* Traverse an s390 ELF linker hash table. */
367
368 #define elf_s390_link_hash_traverse(table, func, info) \
369 (elf_link_hash_traverse \
370 (&(table)->root, \
371 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
372 (info)))
373
374 /* Get the s390 ELF linker hash table from a link_info structure. */
375
376 #define elf_s390_hash_table(p) \
377 ((struct elf_s390_link_hash_table *) ((p)->hash))
378
379 /* Create an entry in an s390 ELF linker hash table. */
380
381 static struct bfd_hash_entry *
382 elf_s390_link_hash_newfunc (entry, table, string)
383 struct bfd_hash_entry *entry;
384 struct bfd_hash_table *table;
385 const char *string;
386 {
387 struct elf_s390_link_hash_entry *ret =
388 (struct elf_s390_link_hash_entry *) entry;
389
390 /* Allocate the structure if it has not already been allocated by a
391 subclass. */
392 if (ret == (struct elf_s390_link_hash_entry *) NULL)
393 ret = ((struct elf_s390_link_hash_entry *)
394 bfd_hash_allocate (table,
395 sizeof (struct elf_s390_link_hash_entry)));
396 if (ret == (struct elf_s390_link_hash_entry *) NULL)
397 return (struct bfd_hash_entry *) ret;
398
399 /* Call the allocation method of the superclass. */
400 ret = ((struct elf_s390_link_hash_entry *)
401 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
402 table, string));
403 if (ret != (struct elf_s390_link_hash_entry *) NULL)
404 {
405 ret->pcrel_relocs_copied = NULL;
406 }
407
408 return (struct bfd_hash_entry *) ret;
409 }
410
411 /* Create an s390 ELF linker hash table. */
412
413 static struct bfd_link_hash_table *
414 elf_s390_link_hash_table_create (abfd)
415 bfd *abfd;
416 {
417 struct elf_s390_link_hash_table *ret;
418 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
419
420 ret = ((struct elf_s390_link_hash_table *) bfd_alloc (abfd, amt));
421 if (ret == (struct elf_s390_link_hash_table *) NULL)
422 return NULL;
423
424 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
425 elf_s390_link_hash_newfunc))
426 {
427 bfd_release (abfd, ret);
428 return NULL;
429 }
430
431 return &ret->root.root;
432 }
433
434
435 /* Look through the relocs for a section during the first phase, and
436 allocate space in the global offset table or procedure linkage
437 table. */
438
439 static boolean
440 elf_s390_check_relocs (abfd, info, sec, relocs)
441 bfd *abfd;
442 struct bfd_link_info *info;
443 asection *sec;
444 const Elf_Internal_Rela *relocs;
445 {
446 bfd *dynobj;
447 Elf_Internal_Shdr *symtab_hdr;
448 struct elf_link_hash_entry **sym_hashes;
449 bfd_signed_vma *local_got_refcounts;
450 const Elf_Internal_Rela *rel;
451 const Elf_Internal_Rela *rel_end;
452 asection *sgot;
453 asection *srelgot;
454 asection *sreloc;
455
456 if (info->relocateable)
457 return true;
458
459 dynobj = elf_hash_table (info)->dynobj;
460 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
461 sym_hashes = elf_sym_hashes (abfd);
462 local_got_refcounts = elf_local_got_offsets (abfd);
463
464 sgot = NULL;
465 srelgot = NULL;
466 sreloc = NULL;
467
468 rel_end = relocs + sec->reloc_count;
469 for (rel = relocs; rel < rel_end; rel++)
470 {
471 unsigned long r_symndx;
472 struct elf_link_hash_entry *h;
473
474 r_symndx = ELF64_R_SYM (rel->r_info);
475
476 if (r_symndx < symtab_hdr->sh_info)
477 h = NULL;
478 else
479 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
480
481 /* Some relocs require a global offset table. */
482 if (dynobj == NULL)
483 {
484 switch (ELF64_R_TYPE (rel->r_info))
485 {
486 case R_390_GOT12:
487 case R_390_GOT16:
488 case R_390_GOT32:
489 case R_390_GOT64:
490 case R_390_GOTOFF:
491 case R_390_GOTPC:
492 case R_390_GOTPCDBL:
493 case R_390_GOTENT:
494 elf_hash_table (info)->dynobj = dynobj = abfd;
495 if (! _bfd_elf_create_got_section (dynobj, info))
496 return false;
497 break;
498
499 default:
500 break;
501 }
502 }
503
504
505 switch (ELF64_R_TYPE (rel->r_info))
506 {
507 case R_390_GOT12:
508 case R_390_GOT16:
509 case R_390_GOT32:
510 case R_390_GOT64:
511 case R_390_GOTENT:
512 /* This symbol requires a global offset table entry. */
513
514 if (sgot == NULL)
515 {
516 sgot = bfd_get_section_by_name (dynobj, ".got");
517 BFD_ASSERT (sgot != NULL);
518 }
519
520
521 if (srelgot == NULL
522 && (h != NULL || info->shared))
523 {
524 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
525 if (srelgot == NULL)
526 {
527 srelgot = bfd_make_section (dynobj, ".rela.got");
528 if (srelgot == NULL
529 || ! bfd_set_section_flags (dynobj, srelgot,
530 (SEC_ALLOC
531 | SEC_LOAD
532 | SEC_HAS_CONTENTS
533 | SEC_IN_MEMORY
534 | SEC_LINKER_CREATED
535 | SEC_READONLY))
536 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
537 return false;
538 }
539 }
540
541 if (h != NULL)
542 {
543 if (h->got.refcount == -1)
544 {
545 h->got.refcount = 1;
546
547 /* Make sure this symbol is output as a dynamic symbol. */
548 if (h->dynindx == -1)
549 {
550 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
551 return false;
552 }
553
554 sgot->_raw_size += 8;
555 srelgot->_raw_size += sizeof (Elf64_External_Rela);
556 }
557 else
558 h->got.refcount += 1;
559 }
560 else
561 {
562 /* This is a global offset table entry for a local symbol. */
563 if (local_got_refcounts == NULL)
564 {
565 bfd_size_type size;
566
567 size = symtab_hdr->sh_info * sizeof (bfd_vma);
568 local_got_refcounts = ((bfd_signed_vma *)
569 bfd_alloc (abfd, size));
570 if (local_got_refcounts == NULL)
571 return false;
572 elf_local_got_refcounts (abfd) = local_got_refcounts;
573 memset (local_got_refcounts, -1, (size_t) size);
574 }
575 if (local_got_refcounts[r_symndx] == -1)
576 {
577 local_got_refcounts[r_symndx] = 1;
578
579 sgot->_raw_size += 8;
580 if (info->shared)
581 {
582 /* If we are generating a shared object, we need to
583 output a R_390_RELATIVE reloc so that the dynamic
584 linker can adjust this GOT entry. */
585 srelgot->_raw_size += sizeof (Elf64_External_Rela);
586 }
587 }
588 else
589 local_got_refcounts[r_symndx] += 1;
590
591 }
592 break;
593
594 case R_390_PLT16DBL:
595 case R_390_PLT32:
596 case R_390_PLT32DBL:
597 case R_390_PLT64:
598 /* This symbol requires a procedure linkage table entry. We
599 actually build the entry in adjust_dynamic_symbol,
600 because this might be a case of linking PIC code which is
601 never referenced by a dynamic object, in which case we
602 don't need to generate a procedure linkage table entry
603 after all. */
604
605 /* If this is a local symbol, we resolve it directly without
606 creating a procedure linkage table entry. */
607 if (h == NULL)
608 continue;
609
610 if (h->plt.refcount == -1)
611 {
612 h->plt.refcount = 1;
613 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
614 }
615 else
616 h->plt.refcount += 1;
617 break;
618
619 case R_390_8:
620 case R_390_16:
621 case R_390_32:
622 case R_390_64:
623 case R_390_PC16:
624 case R_390_PC16DBL:
625 case R_390_PC32:
626 case R_390_PC32DBL:
627 case R_390_PC64:
628 if (h != NULL)
629 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
630
631 /* If we are creating a shared library, and this is a reloc
632 against a global symbol, or a non PC relative reloc
633 against a local symbol, then we need to copy the reloc
634 into the shared library. However, if we are linking with
635 -Bsymbolic, we do not need to copy a reloc against a
636 global symbol which is defined in an object we are
637 including in the link (i.e., DEF_REGULAR is set). At
638 this point we have not seen all the input files, so it is
639 possible that DEF_REGULAR is not set now but will be set
640 later (it is never cleared). We account for that
641 possibility below by storing information in the
642 pcrel_relocs_copied field of the hash table entry. */
643 if (info->shared
644 && (sec->flags & SEC_ALLOC) != 0
645 && (ELF64_R_TYPE (rel->r_info) == R_390_8
646 || ELF64_R_TYPE (rel->r_info) == R_390_16
647 || ELF64_R_TYPE (rel->r_info) == R_390_32
648 || ELF64_R_TYPE (rel->r_info) == R_390_64
649 || (h != NULL
650 && h->dynindx != -1
651 && (! info->symbolic
652 || (h->elf_link_hash_flags
653 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
654 {
655 /* When creating a shared object, we must copy these
656 reloc types into the output file. We create a reloc
657 section in dynobj and make room for this reloc. */
658 if (sreloc == NULL)
659 {
660 const char *name;
661
662 name = (bfd_elf_string_from_elf_section
663 (abfd,
664 elf_elfheader (abfd)->e_shstrndx,
665 elf_section_data (sec)->rel_hdr.sh_name));
666 if (name == NULL)
667 return false;
668
669 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
670 && strcmp (bfd_get_section_name (abfd, sec),
671 name + 5) == 0);
672
673 sreloc = bfd_get_section_by_name (dynobj, name);
674 if (sreloc == NULL)
675 {
676 flagword flags;
677
678 sreloc = bfd_make_section (dynobj, name);
679 flags = (SEC_HAS_CONTENTS | SEC_READONLY
680 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
681 if ((sec->flags & SEC_ALLOC) != 0)
682 flags |= SEC_ALLOC | SEC_LOAD;
683 if (sreloc == NULL
684 || ! bfd_set_section_flags (dynobj, sreloc, flags)
685 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
686 return false;
687 }
688 if (sec->flags & SEC_READONLY)
689 info->flags |= DF_TEXTREL;
690 }
691
692 sreloc->_raw_size += sizeof (Elf64_External_Rela);
693
694 /* If we are linking with -Bsymbolic, and this is a
695 global symbol, we count the number of PC relative
696 relocations we have entered for this symbol, so that
697 we can discard them again if the symbol is later
698 defined by a regular object. Note that this function
699 is only called if we are using an elf64_s390 linker
700 hash table, which means that h is really a pointer to
701 an elf64_s390_link_hash_entry. */
702 if (h != NULL
703 && (ELF64_R_TYPE (rel->r_info) == R_390_PC16 ||
704 ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL ||
705 ELF64_R_TYPE (rel->r_info) == R_390_PC32 ||
706 ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL ||
707 ELF64_R_TYPE (rel->r_info) == R_390_PC64))
708 {
709 struct elf_s390_link_hash_entry *eh;
710 struct elf_s390_pcrel_relocs_copied *p;
711
712 eh = (struct elf_s390_link_hash_entry *) h;
713
714 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
715 if (p->section == sreloc)
716 break;
717
718 if (p == NULL)
719 {
720 p = ((struct elf_s390_pcrel_relocs_copied *)
721 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
722 if (p == NULL)
723 return false;
724 p->next = eh->pcrel_relocs_copied;
725 eh->pcrel_relocs_copied = p;
726 p->section = sreloc;
727 p->count = 0;
728 }
729
730 ++p->count;
731 }
732 }
733
734 break;
735
736 /* This relocation describes the C++ object vtable hierarchy.
737 Reconstruct it for later use during GC. */
738 case R_390_GNU_VTINHERIT:
739 if (!_bfd_elf64_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
740 return false;
741 break;
742
743 /* This relocation describes which C++ vtable entries are actually
744 used. Record for later use during GC. */
745 case R_390_GNU_VTENTRY:
746 if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend))
747 return false;
748 break;
749
750 default:
751 break;
752 }
753 }
754
755 return true;
756 }
757
758 /* Return the section that should be marked against GC for a given
759 relocation. */
760
761 static asection *
762 elf_s390_gc_mark_hook (abfd, info, rel, h, sym)
763 bfd *abfd;
764 struct bfd_link_info *info ATTRIBUTE_UNUSED;
765 Elf_Internal_Rela *rel;
766 struct elf_link_hash_entry *h;
767 Elf_Internal_Sym *sym;
768 {
769 if (h != NULL)
770 {
771 switch (ELF64_R_TYPE (rel->r_info))
772 {
773 case R_390_GNU_VTINHERIT:
774 case R_390_GNU_VTENTRY:
775 break;
776
777 default:
778 switch (h->root.type)
779 {
780 case bfd_link_hash_defined:
781 case bfd_link_hash_defweak:
782 return h->root.u.def.section;
783
784 case bfd_link_hash_common:
785 return h->root.u.c.p->section;
786
787 default:
788 break;
789 }
790 }
791 }
792 else
793 {
794 if (!(elf_bad_symtab (abfd)
795 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
796 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
797 && sym->st_shndx != SHN_COMMON))
798 {
799 return bfd_section_from_elf_index (abfd, sym->st_shndx);
800 }
801 }
802
803 return NULL;
804 }
805
806 /* Update the got entry reference counts for the section being removed. */
807
808 static boolean
809 elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
810 bfd *abfd ATTRIBUTE_UNUSED;
811 struct bfd_link_info *info ATTRIBUTE_UNUSED;
812 asection *sec ATTRIBUTE_UNUSED;
813 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
814 {
815 Elf_Internal_Shdr *symtab_hdr;
816 struct elf_link_hash_entry **sym_hashes;
817 bfd_signed_vma *local_got_refcounts;
818 const Elf_Internal_Rela *rel, *relend;
819 unsigned long r_symndx;
820 struct elf_link_hash_entry *h;
821 bfd *dynobj;
822 asection *sgot;
823 asection *srelgot;
824
825 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
826 sym_hashes = elf_sym_hashes (abfd);
827 local_got_refcounts = elf_local_got_refcounts (abfd);
828
829 dynobj = elf_hash_table (info)->dynobj;
830 if (dynobj == NULL)
831 return true;
832
833 sgot = bfd_get_section_by_name (dynobj, ".got");
834 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
835
836 relend = relocs + sec->reloc_count;
837 for (rel = relocs; rel < relend; rel++)
838 switch (ELF64_R_TYPE (rel->r_info))
839 {
840 case R_390_GOT12:
841 case R_390_GOT16:
842 case R_390_GOT32:
843 case R_390_GOT64:
844 case R_390_GOTOFF:
845 case R_390_GOTPC:
846 case R_390_GOTPCDBL:
847 case R_390_GOTENT:
848 r_symndx = ELF64_R_SYM (rel->r_info);
849 if (r_symndx >= symtab_hdr->sh_info)
850 {
851 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
852 if (h->got.refcount > 0)
853 {
854 h->got.refcount -= 1;
855 if (h->got.refcount == 0)
856 {
857 sgot->_raw_size -= 8;
858 srelgot->_raw_size -= sizeof (Elf64_External_Rela);
859 }
860 }
861 }
862 else if (local_got_refcounts != NULL)
863 {
864 if (local_got_refcounts[r_symndx] > 0)
865 {
866 local_got_refcounts[r_symndx] -= 1;
867 if (local_got_refcounts[r_symndx] == 0)
868 {
869 sgot->_raw_size -= 8;
870 if (info->shared)
871 srelgot->_raw_size -= sizeof (Elf64_External_Rela);
872 }
873 }
874 }
875 break;
876
877 case R_390_PLT16DBL:
878 case R_390_PLT32:
879 case R_390_PLT32DBL:
880 case R_390_PLT64:
881 r_symndx = ELF64_R_SYM (rel->r_info);
882 if (r_symndx >= symtab_hdr->sh_info)
883 {
884 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
885 if (h->plt.refcount > 0)
886 h->plt.refcount -= 1;
887 }
888 break;
889
890 default:
891 break;
892 }
893
894 return true;
895 }
896
897 /* Adjust a symbol defined by a dynamic object and referenced by a
898 regular object. The current definition is in some section of the
899 dynamic object, but we're not including those sections. We have to
900 change the definition to something the rest of the link can
901 understand. */
902
903 static boolean
904 elf_s390_adjust_dynamic_symbol (info, h)
905 struct bfd_link_info *info;
906 struct elf_link_hash_entry *h;
907 {
908 bfd *dynobj;
909 asection *s;
910 unsigned int power_of_two;
911
912 dynobj = elf_hash_table (info)->dynobj;
913
914 /* Make sure we know what is going on here. */
915 BFD_ASSERT (dynobj != NULL
916 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
917 || h->weakdef != NULL
918 || ((h->elf_link_hash_flags
919 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
920 && (h->elf_link_hash_flags
921 & ELF_LINK_HASH_REF_REGULAR) != 0
922 && (h->elf_link_hash_flags
923 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
924
925 /* If this is a function, put it in the procedure linkage table. We
926 will fill in the contents of the procedure linkage table later
927 (although we could actually do it here). */
928 if (h->type == STT_FUNC
929 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
930 {
931 if ((! info->shared
932 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
933 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0)
934 || (info->shared && h->plt.refcount <= 0))
935 {
936 /* This case can occur if we saw a PLT32 reloc in an input
937 file, but the symbol was never referred to by a dynamic
938 object. In such a case, we don't actually need to build
939 a procedure linkage table, and we can just do a PC32
940 reloc instead. */
941 h->plt.offset = (bfd_vma) -1;
942 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
943 return true;
944 }
945
946 /* Make sure this symbol is output as a dynamic symbol. */
947 if (h->dynindx == -1)
948 {
949 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
950 return false;
951 }
952
953 s = bfd_get_section_by_name (dynobj, ".plt");
954 BFD_ASSERT (s != NULL);
955
956
957 /* The first entry in .plt is reserved. */
958 if (s->_raw_size == 0)
959 s->_raw_size = PLT_FIRST_ENTRY_SIZE;
960
961 /* If this symbol is not defined in a regular file, and we are
962 not generating a shared library, then set the symbol to this
963 location in the .plt. This is required to make function
964 pointers compare as equal between the normal executable and
965 the shared library. */
966 if (! info->shared
967 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
968 {
969 h->root.u.def.section = s;
970 h->root.u.def.value = s->_raw_size;
971 }
972
973 h->plt.offset = s->_raw_size;
974
975 /* Make room for this entry. */
976 s->_raw_size += PLT_ENTRY_SIZE;
977
978 /* We also need to make an entry in the .got.plt section, which
979 will be placed in the .got section by the linker script. */
980 s = bfd_get_section_by_name (dynobj, ".got.plt");
981 BFD_ASSERT (s != NULL);
982 s->_raw_size += GOT_ENTRY_SIZE;
983
984 /* We also need to make an entry in the .rela.plt section. */
985 s = bfd_get_section_by_name (dynobj, ".rela.plt");
986 BFD_ASSERT (s != NULL);
987 s->_raw_size += sizeof (Elf64_External_Rela);
988
989 return true;
990 }
991
992 /* If this is a weak symbol, and there is a real definition, the
993 processor independent code will have arranged for us to see the
994 real definition first, and we can just use the same value. */
995 if (h->weakdef != NULL)
996 {
997 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
998 || h->weakdef->root.type == bfd_link_hash_defweak);
999 h->root.u.def.section = h->weakdef->root.u.def.section;
1000 h->root.u.def.value = h->weakdef->root.u.def.value;
1001 return true;
1002 }
1003
1004 /* This is a reference to a symbol defined by a dynamic object which
1005 is not a function. */
1006
1007 /* If we are creating a shared library, we must presume that the
1008 only references to the symbol are via the global offset table.
1009 For such cases we need not do anything here; the relocations will
1010 be handled correctly by relocate_section. */
1011 if (info->shared)
1012 return true;
1013
1014 /* If there are no references to this symbol that do not use the
1015 GOT, we don't need to generate a copy reloc. */
1016 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1017 return true;
1018
1019 /* We must allocate the symbol in our .dynbss section, which will
1020 become part of the .bss section of the executable. There will be
1021 an entry for this symbol in the .dynsym section. The dynamic
1022 object will contain position independent code, so all references
1023 from the dynamic object to this symbol will go through the global
1024 offset table. The dynamic linker will use the .dynsym entry to
1025 determine the address it must put in the global offset table, so
1026 both the dynamic object and the regular object will refer to the
1027 same memory location for the variable. */
1028
1029 s = bfd_get_section_by_name (dynobj, ".dynbss");
1030 BFD_ASSERT (s != NULL);
1031
1032 /* We must generate a R_390_COPY reloc to tell the dynamic linker
1033 to copy the initial value out of the dynamic object and into the
1034 runtime process image. We need to remember the offset into the
1035 .rel.bss section we are going to use. */
1036 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1037 {
1038 asection *srel;
1039
1040 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1041 BFD_ASSERT (srel != NULL);
1042 srel->_raw_size += sizeof (Elf64_External_Rela);
1043 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1044 }
1045
1046 /* We need to figure out the alignment required for this symbol. I
1047 have no idea how ELF linkers handle this. */
1048 power_of_two = bfd_log2 (h->size);
1049 if (power_of_two > 3)
1050 power_of_two = 3;
1051
1052 /* Apply the required alignment. */
1053 s->_raw_size = BFD_ALIGN (s->_raw_size,
1054 (bfd_size_type) (1 << power_of_two));
1055 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1056 {
1057 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
1058 return false;
1059 }
1060
1061 /* Define the symbol as being at this point in the section. */
1062 h->root.u.def.section = s;
1063 h->root.u.def.value = s->_raw_size;
1064
1065 /* Increment the section size to make room for the symbol. */
1066 s->_raw_size += h->size;
1067
1068 return true;
1069 }
1070
1071 /* Set the sizes of the dynamic sections. */
1072
1073 static boolean
1074 elf_s390_size_dynamic_sections (output_bfd, info)
1075 bfd *output_bfd ATTRIBUTE_UNUSED;
1076 struct bfd_link_info *info;
1077 {
1078 bfd *dynobj;
1079 asection *s;
1080 boolean relocs;
1081 boolean plt;
1082
1083 dynobj = elf_hash_table (info)->dynobj;
1084 BFD_ASSERT (dynobj != NULL);
1085
1086 if (elf_hash_table (info)->dynamic_sections_created)
1087 {
1088 /* Set the contents of the .interp section to the interpreter. */
1089 if (! info->shared)
1090 {
1091 s = bfd_get_section_by_name (dynobj, ".interp");
1092 BFD_ASSERT (s != NULL);
1093 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1094 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1095 }
1096 }
1097 else
1098 {
1099 /* We may have created entries in the .rela.got section.
1100 However, if we are not creating the dynamic sections, we will
1101 not actually use these entries. Reset the size of .rela.got,
1102 which will cause it to get stripped from the output file
1103 below. */
1104 s = bfd_get_section_by_name (dynobj, ".rela.got");
1105 if (s != NULL)
1106 s->_raw_size = 0;
1107 }
1108
1109 /* If this is a -Bsymbolic shared link, then we need to discard all
1110 PC relative relocs against symbols defined in a regular object.
1111 We allocated space for them in the check_relocs routine, but we
1112 will not fill them in in the relocate_section routine. */
1113 if (info->shared)
1114 elf_s390_link_hash_traverse (elf_s390_hash_table (info),
1115 elf_s390_discard_copies,
1116 (PTR) info);
1117
1118 /* The check_relocs and adjust_dynamic_symbol entry points have
1119 determined the sizes of the various dynamic sections. Allocate
1120 memory for them. */
1121 plt = false;
1122 relocs = false;
1123 for (s = dynobj->sections; s != NULL; s = s->next)
1124 {
1125 const char *name;
1126 boolean strip;
1127
1128 if ((s->flags & SEC_LINKER_CREATED) == 0)
1129 continue;
1130
1131 /* It's OK to base decisions on the section name, because none
1132 of the dynobj section names depend upon the input files. */
1133 name = bfd_get_section_name (dynobj, s);
1134
1135 strip = false;
1136
1137 if (strcmp (name, ".plt") == 0)
1138 {
1139 if (s->_raw_size == 0)
1140 {
1141 /* Strip this section if we don't need it; see the
1142 comment below. */
1143 strip = true;
1144 }
1145 else
1146 {
1147 /* Remember whether there is a PLT. */
1148 plt = true;
1149 }
1150 }
1151 else if (strncmp (name, ".rela", 5) == 0)
1152 {
1153 if (s->_raw_size == 0)
1154 {
1155 /* If we don't need this section, strip it from the
1156 output file. This is to handle .rela.bss and
1157 .rel.plt. We must create it in
1158 create_dynamic_sections, because it must be created
1159 before the linker maps input sections to output
1160 sections. The linker does that before
1161 adjust_dynamic_symbol is called, and it is that
1162 function which decides whether anything needs to go
1163 into these sections. */
1164 strip = true;
1165 }
1166 else
1167 {
1168 /* Remember whether there are any reloc sections other
1169 than .rela.plt. */
1170 if (strcmp (name, ".rela.plt") != 0)
1171 relocs = true;
1172
1173 /* We use the reloc_count field as a counter if we need
1174 to copy relocs into the output file. */
1175 s->reloc_count = 0;
1176 }
1177 }
1178 else if (strncmp (name, ".got", 4) != 0)
1179 {
1180 /* It's not one of our sections, so don't allocate space. */
1181 continue;
1182 }
1183
1184 if (strip)
1185 {
1186 _bfd_strip_section_from_output (info, s);
1187 continue;
1188 }
1189
1190 /* Allocate memory for the section contents. */
1191 s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size);
1192 if (s->contents == NULL && s->_raw_size != 0)
1193 return false;
1194 }
1195
1196 if (elf_hash_table (info)->dynamic_sections_created)
1197 {
1198 /* Add some entries to the .dynamic section. We fill in the
1199 values later, in elf_s390_finish_dynamic_sections, but we
1200 must add the entries now so that we get the correct size for
1201 the .dynamic section. The DT_DEBUG entry is filled in by the
1202 dynamic linker and used by the debugger. */
1203 #define add_dynamic_entry(TAG, VAL) \
1204 bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1205
1206 if (! info->shared)
1207 {
1208 if (!add_dynamic_entry (DT_DEBUG, 0))
1209 return false;
1210 }
1211
1212 if (plt)
1213 {
1214 if (!add_dynamic_entry (DT_PLTGOT, 0)
1215 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1216 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1217 || !add_dynamic_entry (DT_JMPREL, 0))
1218 return false;
1219 }
1220
1221 if (relocs)
1222 {
1223 if (!add_dynamic_entry (DT_RELA, 0)
1224 || !add_dynamic_entry (DT_RELASZ, 0)
1225 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
1226 return false;
1227 }
1228
1229 if ((info->flags & DF_TEXTREL) != 0)
1230 {
1231 if (!add_dynamic_entry (DT_TEXTREL, 0))
1232 return false;
1233 info->flags |= DF_TEXTREL;
1234 }
1235 }
1236 #undef add_dynamic_entry
1237
1238 return true;
1239 }
1240
1241 /* This function is called via elf64_s390_link_hash_traverse if we are
1242 creating a shared object with -Bsymbolic. It discards the space
1243 allocated to copy PC relative relocs against symbols which are
1244 defined in regular objects. We allocated space for them in the
1245 check_relocs routine, but we won't fill them in in the
1246 relocate_section routine. */
1247
1248 /*ARGSUSED*/
1249 static boolean
1250 elf_s390_discard_copies (h, inf)
1251 struct elf_s390_link_hash_entry *h;
1252 PTR inf;
1253 {
1254 struct elf_s390_pcrel_relocs_copied *s;
1255 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1256
1257 /* If a symbol has been forced local or we have found a regular
1258 definition for the symbolic link case, then we won't be needing
1259 any relocs. */
1260 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1261 && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
1262 || info->symbolic))
1263 {
1264 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1265 s->section->_raw_size -= s->count * sizeof (Elf64_External_Rela);
1266 }
1267
1268 return true;
1269 }
1270 /* Relocate a 390 ELF section. */
1271
1272 static boolean
1273 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
1274 contents, relocs, local_syms, local_sections)
1275 bfd *output_bfd;
1276 struct bfd_link_info *info;
1277 bfd *input_bfd;
1278 asection *input_section;
1279 bfd_byte *contents;
1280 Elf_Internal_Rela *relocs;
1281 Elf_Internal_Sym *local_syms;
1282 asection **local_sections;
1283 {
1284 bfd *dynobj;
1285 Elf_Internal_Shdr *symtab_hdr;
1286 struct elf_link_hash_entry **sym_hashes;
1287 bfd_vma *local_got_offsets;
1288 asection *sgot;
1289 asection *splt;
1290 asection *sreloc;
1291 Elf_Internal_Rela *rel;
1292 Elf_Internal_Rela *relend;
1293
1294 dynobj = elf_hash_table (info)->dynobj;
1295 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1296 sym_hashes = elf_sym_hashes (input_bfd);
1297 local_got_offsets = elf_local_got_offsets (input_bfd);
1298
1299 sgot = NULL;
1300 splt = NULL;
1301 sreloc = NULL;
1302 if (dynobj != NULL)
1303 {
1304 splt = bfd_get_section_by_name (dynobj, ".plt");
1305 sgot = bfd_get_section_by_name (dynobj, ".got");
1306 }
1307
1308 rel = relocs;
1309 relend = relocs + input_section->reloc_count;
1310 for (; rel < relend; rel++)
1311 {
1312 int r_type;
1313 reloc_howto_type *howto;
1314 unsigned long r_symndx;
1315 struct elf_link_hash_entry *h;
1316 Elf_Internal_Sym *sym;
1317 asection *sec;
1318 bfd_vma relocation;
1319 bfd_reloc_status_type r;
1320
1321 r_type = ELF64_R_TYPE (rel->r_info);
1322 if (r_type == R_390_GNU_VTINHERIT
1323 || r_type == R_390_GNU_VTENTRY)
1324 continue;
1325 if (r_type < 0 || r_type >= (int) R_390_max)
1326 {
1327 bfd_set_error (bfd_error_bad_value);
1328 return false;
1329 }
1330 howto = elf_howto_table + r_type;
1331
1332 r_symndx = ELF64_R_SYM (rel->r_info);
1333
1334 if (info->relocateable)
1335 {
1336 /* This is a relocateable link. We don't have to change
1337 anything, unless the reloc is against a section symbol,
1338 in which case we have to adjust according to where the
1339 section symbol winds up in the output section. */
1340 if (r_symndx < symtab_hdr->sh_info)
1341 {
1342 sym = local_syms + r_symndx;
1343 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1344 {
1345 sec = local_sections[r_symndx];
1346 rel->r_addend += sec->output_offset + sym->st_value;
1347 }
1348 }
1349
1350 continue;
1351 }
1352
1353 /* This is a final link. */
1354 h = NULL;
1355 sym = NULL;
1356 sec = NULL;
1357 if (r_symndx < symtab_hdr->sh_info)
1358 {
1359 sym = local_syms + r_symndx;
1360 sec = local_sections[r_symndx];
1361 relocation = (sec->output_section->vma
1362 + sec->output_offset
1363 + sym->st_value);
1364 }
1365 else
1366 {
1367 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1368 while (h->root.type == bfd_link_hash_indirect
1369 || h->root.type == bfd_link_hash_warning)
1370 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1371 if (h->root.type == bfd_link_hash_defined
1372 || h->root.type == bfd_link_hash_defweak)
1373 {
1374 sec = h->root.u.def.section;
1375 if ((r_type == R_390_GOTPC
1376 || r_type == R_390_GOTPCDBL)
1377 || ((r_type == R_390_PLT16DBL ||
1378 r_type == R_390_PLT32 ||
1379 r_type == R_390_PLT32DBL ||
1380 r_type == R_390_PLT64)
1381 && splt != NULL
1382 && h->plt.offset != (bfd_vma) -1)
1383 || ((r_type == R_390_GOT12 ||
1384 r_type == R_390_GOT16 ||
1385 r_type == R_390_GOT32 ||
1386 r_type == R_390_GOT64 ||
1387 r_type == R_390_GOTENT)
1388 && elf_hash_table (info)->dynamic_sections_created
1389 && (! info->shared
1390 || (! info->symbolic && h->dynindx != -1)
1391 || (h->elf_link_hash_flags
1392 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1393 || (info->shared
1394 && ((! info->symbolic && h->dynindx != -1)
1395 || (h->elf_link_hash_flags
1396 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1397 && ( r_type == R_390_8 ||
1398 r_type == R_390_16 ||
1399 r_type == R_390_32 ||
1400 r_type == R_390_64 ||
1401 r_type == R_390_PC16 ||
1402 r_type == R_390_PC16DBL ||
1403 r_type == R_390_PC32 ||
1404 r_type == R_390_PC32DBL ||
1405 r_type == R_390_PC64)
1406 && ((input_section->flags & SEC_ALLOC) != 0
1407 /* DWARF will emit R_386_32 relocations in its
1408 sections against symbols defined externally
1409 in shared libraries. We can't do anything
1410 with them here. */
1411 || ((input_section->flags & SEC_DEBUGGING) != 0
1412 && (h->elf_link_hash_flags
1413 & ELF_LINK_HASH_DEF_DYNAMIC) != 0))))
1414 {
1415 /* In these cases, we don't need the relocation
1416 value. We check specially because in some
1417 obscure cases sec->output_section will be NULL. */
1418 relocation = 0;
1419 }
1420 else if (sec->output_section == NULL)
1421 {
1422 (*_bfd_error_handler)
1423 (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
1424 bfd_get_filename (input_bfd), h->root.root.string,
1425 bfd_get_section_name (input_bfd, input_section));
1426 relocation = 0;
1427 }
1428 else
1429 relocation = (h->root.u.def.value
1430 + sec->output_section->vma
1431 + sec->output_offset);
1432 }
1433 else if (h->root.type == bfd_link_hash_undefweak)
1434 relocation = 0;
1435 else if (info->shared && !info->symbolic
1436 && !info->no_undefined
1437 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1438 relocation = 0;
1439 else
1440 {
1441 if (! ((*info->callbacks->undefined_symbol)
1442 (info, h->root.root.string, input_bfd,
1443 input_section, rel->r_offset,
1444 (!info->shared || info->no_undefined
1445 || ELF_ST_VISIBILITY (h->other)))))
1446 return false;
1447 relocation = 0;
1448 }
1449 }
1450
1451 switch (r_type)
1452 {
1453 case R_390_GOT12:
1454 case R_390_GOT16:
1455 case R_390_GOT32:
1456 case R_390_GOT64:
1457 case R_390_GOTENT:
1458 /* Relocation is to the entry for this symbol in the global
1459 offset table. */
1460 BFD_ASSERT (sgot != NULL);
1461
1462 if (h != NULL)
1463 {
1464 bfd_vma off;
1465
1466 off = h->got.offset;
1467 BFD_ASSERT (off != (bfd_vma) -1);
1468
1469 if (! elf_hash_table (info)->dynamic_sections_created
1470 || (info->shared
1471 && (info->symbolic || h->dynindx == -1)
1472 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1473 {
1474 /* This is actually a static link, or it is a
1475 -Bsymbolic link and the symbol is defined
1476 locally, or the symbol was forced to be local
1477 because of a version file. We must initialize
1478 this entry in the global offset table. Since the
1479 offset must always be a multiple of 2, we use the
1480 least significant bit to record whether we have
1481 initialized it already.
1482
1483 When doing a dynamic link, we create a .rel.got
1484 relocation entry to initialize the value. This
1485 is done in the finish_dynamic_symbol routine. */
1486 if ((off & 1) != 0)
1487 off &= ~1;
1488 else
1489 {
1490 bfd_put_64 (output_bfd, relocation,
1491 sgot->contents + off);
1492 h->got.offset |= 1;
1493 }
1494 }
1495 relocation = sgot->output_offset + off;
1496 }
1497 else
1498 {
1499 bfd_vma off;
1500
1501 BFD_ASSERT (local_got_offsets != NULL
1502 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1503
1504 off = local_got_offsets[r_symndx];
1505
1506 /* The offset must always be a multiple of 8. We use
1507 the least significant bit to record whether we have
1508 already generated the necessary reloc. */
1509 if ((off & 1) != 0)
1510 off &= ~1;
1511 else
1512 {
1513 bfd_put_64 (output_bfd, relocation, sgot->contents + off);
1514
1515 if (info->shared)
1516 {
1517 asection *srelgot;
1518 Elf_Internal_Rela outrel;
1519
1520 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1521 BFD_ASSERT (srelgot != NULL);
1522
1523 outrel.r_offset = (sgot->output_section->vma
1524 + sgot->output_offset
1525 + off);
1526 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
1527 outrel.r_addend = relocation;
1528 bfd_elf64_swap_reloca_out (output_bfd, &outrel,
1529 (((Elf64_External_Rela *)
1530 srelgot->contents)
1531 + srelgot->reloc_count));
1532 ++srelgot->reloc_count;
1533 }
1534
1535 local_got_offsets[r_symndx] |= 1;
1536 }
1537
1538 relocation = sgot->output_offset + off;
1539 }
1540
1541 /*
1542 * For @GOTENT the relocation is against the offset between
1543 * the instruction and the symbols entry in the GOT and not
1544 * between the start of the GOT and the symbols entry. We
1545 * add the vma of the GOT to get the correct value.
1546 */
1547 if (r_type == R_390_GOTENT)
1548 relocation += sgot->output_section->vma;
1549
1550 break;
1551
1552 case R_390_GOTOFF:
1553 /* Relocation is relative to the start of the global offset
1554 table. */
1555
1556 if (sgot == NULL)
1557 {
1558 sgot = bfd_get_section_by_name (dynobj, ".got");
1559 BFD_ASSERT (sgot != NULL);
1560 }
1561
1562 /* Note that sgot->output_offset is not involved in this
1563 calculation. We always want the start of .got. If we
1564 defined _GLOBAL_OFFSET_TABLE in a different way, as is
1565 permitted by the ABI, we might have to change this
1566 calculation. */
1567 relocation -= sgot->output_section->vma;
1568
1569 break;
1570
1571 case R_390_GOTPC:
1572 case R_390_GOTPCDBL:
1573 /* Use global offset table as symbol value. */
1574
1575 if (sgot == NULL)
1576 {
1577 sgot = bfd_get_section_by_name (dynobj, ".got");
1578 BFD_ASSERT (sgot != NULL);
1579 }
1580
1581 relocation = sgot->output_section->vma;
1582
1583 break;
1584
1585 case R_390_PLT16DBL:
1586 case R_390_PLT32:
1587 case R_390_PLT32DBL:
1588 case R_390_PLT64:
1589 /* Relocation is to the entry for this symbol in the
1590 procedure linkage table. */
1591
1592 /* Resolve a PLT32 reloc against a local symbol directly,
1593 without using the procedure linkage table. */
1594 if (h == NULL)
1595 break;
1596
1597 if (h->plt.offset == (bfd_vma) -1 || splt == NULL)
1598 {
1599 /* We didn't make a PLT entry for this symbol. This
1600 happens when statically linking PIC code, or when
1601 using -Bsymbolic. */
1602 break;
1603 }
1604
1605 relocation = (splt->output_section->vma
1606 + splt->output_offset
1607 + h->plt.offset);
1608
1609 break;
1610
1611 case R_390_8:
1612 case R_390_16:
1613 case R_390_32:
1614 case R_390_64:
1615 case R_390_PC16:
1616 case R_390_PC16DBL:
1617 case R_390_PC32:
1618 case R_390_PC32DBL:
1619 case R_390_PC64:
1620 if (info->shared
1621 && (input_section->flags & SEC_ALLOC) != 0
1622 && (r_type == R_390_8
1623 || r_type == R_390_16
1624 || r_type == R_390_32
1625 || r_type == R_390_64
1626 || (h != NULL
1627 && h->dynindx != -1
1628 && (! info->symbolic
1629 || (h->elf_link_hash_flags
1630 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1631 {
1632 Elf_Internal_Rela outrel;
1633 boolean skip, relocate;
1634
1635 /* When generating a shared object, these relocations
1636 are copied into the output file to be resolved at run
1637 time. */
1638
1639 if (sreloc == NULL)
1640 {
1641 const char *name;
1642
1643 name = (bfd_elf_string_from_elf_section
1644 (input_bfd,
1645 elf_elfheader (input_bfd)->e_shstrndx,
1646 elf_section_data (input_section)->rel_hdr.sh_name));
1647 if (name == NULL)
1648 return false;
1649
1650 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1651 && strcmp (bfd_get_section_name (input_bfd,
1652 input_section),
1653 name + 5) == 0);
1654
1655 sreloc = bfd_get_section_by_name (dynobj, name);
1656 BFD_ASSERT (sreloc != NULL);
1657 }
1658
1659 skip = false;
1660
1661 if (elf_section_data (input_section)->stab_info == NULL)
1662 outrel.r_offset = rel->r_offset;
1663 else
1664 {
1665 bfd_vma off;
1666
1667 off = (_bfd_stab_section_offset
1668 (output_bfd, &elf_hash_table (info)->stab_info,
1669 input_section,
1670 &elf_section_data (input_section)->stab_info,
1671 rel->r_offset));
1672 if (off == (bfd_vma) -1)
1673 skip = true;
1674 outrel.r_offset = off;
1675 }
1676
1677 outrel.r_offset += (input_section->output_section->vma
1678 + input_section->output_offset);
1679
1680 if (skip)
1681 {
1682 memset (&outrel, 0, sizeof outrel);
1683 relocate = false;
1684 }
1685 else if (r_type == R_390_PC16 ||
1686 r_type == R_390_PC16DBL ||
1687 r_type == R_390_PC32 ||
1688 r_type == R_390_PC32DBL ||
1689 r_type == R_390_PC64)
1690 {
1691 BFD_ASSERT (h != NULL && h->dynindx != -1);
1692 relocate = false;
1693 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
1694 outrel.r_addend = relocation + rel->r_addend;
1695 }
1696 else
1697 {
1698 /* h->dynindx may be -1 if this symbol was marked to
1699 become local. */
1700 if (h == NULL
1701 || ((info->symbolic || h->dynindx == -1)
1702 && (h->elf_link_hash_flags
1703 & ELF_LINK_HASH_DEF_REGULAR) != 0))
1704 {
1705 relocate = true;
1706 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
1707 outrel.r_addend = relocation + rel->r_addend;
1708 }
1709 else
1710 {
1711 BFD_ASSERT (h->dynindx != -1);
1712 relocate = false;
1713 outrel.r_info = ELF64_R_INFO (h->dynindx, R_390_64);
1714 outrel.r_addend = relocation + rel->r_addend;
1715 }
1716 }
1717
1718 bfd_elf64_swap_reloca_out (output_bfd, &outrel,
1719 (((Elf64_External_Rela *)
1720 sreloc->contents)
1721 + sreloc->reloc_count));
1722 ++sreloc->reloc_count;
1723
1724 /* If this reloc is against an external symbol, we do
1725 not want to fiddle with the addend. Otherwise, we
1726 need to include the symbol value so that it becomes
1727 an addend for the dynamic reloc. */
1728 if (! relocate)
1729 continue;
1730 }
1731
1732 break;
1733
1734 default:
1735 break;
1736 }
1737
1738 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1739 contents, rel->r_offset,
1740 relocation, rel->r_addend);
1741
1742 if (r != bfd_reloc_ok)
1743 {
1744 switch (r)
1745 {
1746 default:
1747 case bfd_reloc_outofrange:
1748 abort ();
1749 case bfd_reloc_overflow:
1750 {
1751 const char *name;
1752
1753 if (h != NULL)
1754 name = h->root.root.string;
1755 else
1756 {
1757 name = bfd_elf_string_from_elf_section (input_bfd,
1758 symtab_hdr->sh_link,
1759 sym->st_name);
1760 if (name == NULL)
1761 return false;
1762 if (*name == '\0')
1763 name = bfd_section_name (input_bfd, sec);
1764 }
1765 if (! ((*info->callbacks->reloc_overflow)
1766 (info, name, howto->name, (bfd_vma) 0,
1767 input_bfd, input_section, rel->r_offset)))
1768 return false;
1769 }
1770 break;
1771 }
1772 }
1773 }
1774
1775 return true;
1776 }
1777
1778 /* Finish up dynamic symbol handling. We set the contents of various
1779 dynamic sections here. */
1780
1781 static boolean
1782 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
1783 bfd *output_bfd;
1784 struct bfd_link_info *info;
1785 struct elf_link_hash_entry *h;
1786 Elf_Internal_Sym *sym;
1787 {
1788 bfd *dynobj;
1789
1790 dynobj = elf_hash_table (info)->dynobj;
1791
1792 if (h->plt.offset != (bfd_vma) -1)
1793 {
1794 asection *splt;
1795 asection *srela;
1796 Elf_Internal_Rela rela;
1797 bfd_vma got_offset;
1798 bfd_vma plt_index;
1799 asection *sgot;
1800
1801 /* This symbol has an entry in the procedure linkage table. Set
1802 it up. */
1803
1804 BFD_ASSERT (h->dynindx != -1);
1805
1806 splt = bfd_get_section_by_name (dynobj, ".plt");
1807 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1808 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1809 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1810
1811 /* Calc. index no.
1812 Current offset - size first entry / entry size. */
1813 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
1814
1815 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
1816 addr & GOT addr. */
1817 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
1818
1819 /* Fill in the blueprint of a PLT. */
1820 bfd_put_32 (output_bfd, PLT_ENTRY_WORD0,
1821 splt->contents + h->plt.offset);
1822 bfd_put_32 (output_bfd, PLT_ENTRY_WORD1,
1823 splt->contents + h->plt.offset + 4);
1824 bfd_put_32 (output_bfd, PLT_ENTRY_WORD2,
1825 splt->contents + h->plt.offset + 8);
1826 bfd_put_32 (output_bfd, PLT_ENTRY_WORD3,
1827 splt->contents + h->plt.offset + 12);
1828 bfd_put_32 (output_bfd, PLT_ENTRY_WORD4,
1829 splt->contents + h->plt.offset + 16);
1830 bfd_put_32 (output_bfd, PLT_ENTRY_WORD5,
1831 splt->contents + h->plt.offset + 20);
1832 bfd_put_32 (output_bfd, PLT_ENTRY_WORD6,
1833 splt->contents + h->plt.offset + 24);
1834 bfd_put_32 (output_bfd, PLT_ENTRY_WORD7,
1835 splt->contents + h->plt.offset + 28);
1836 /* Fixup the relative address to the GOT entry */
1837 bfd_put_32 (output_bfd,
1838 (sgot->output_section->vma + sgot->output_offset + got_offset
1839 - (splt->output_section->vma + h->plt.offset))/2,
1840 splt->contents + h->plt.offset + 2);
1841 /* Fixup the relative branch to PLT 0 */
1842 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
1843 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
1844 splt->contents + h->plt.offset + 24);
1845 /* Fixup offset into symbol table */
1846 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
1847 splt->contents + h->plt.offset + 28);
1848
1849 /* Fill in the entry in the .rela.plt section. */
1850 rela.r_offset = (sgot->output_section->vma
1851 + sgot->output_offset
1852 + got_offset);
1853 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
1854 rela.r_addend = 0;
1855 bfd_elf64_swap_reloca_out (output_bfd, &rela,
1856 ((Elf64_External_Rela *) srela->contents
1857 + plt_index ));
1858
1859 /* Fill in the entry in the global offset table.
1860 Points to instruction after GOT offset. */
1861 bfd_put_64 (output_bfd,
1862 (splt->output_section->vma
1863 + splt->output_offset
1864 + h->plt.offset
1865 + 14),
1866 sgot->contents + got_offset);
1867
1868
1869 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1870 {
1871 /* Mark the symbol as undefined, rather than as defined in
1872 the .plt section. Leave the value alone. */
1873 sym->st_shndx = SHN_UNDEF;
1874 }
1875 }
1876
1877 if (h->got.offset != (bfd_vma) -1)
1878 {
1879 asection *sgot;
1880 asection *srela;
1881 Elf_Internal_Rela rela;
1882
1883 /* This symbol has an entry in the global offset table. Set it
1884 up. */
1885
1886 sgot = bfd_get_section_by_name (dynobj, ".got");
1887 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1888 BFD_ASSERT (sgot != NULL && srela != NULL);
1889
1890 rela.r_offset = (sgot->output_section->vma
1891 + sgot->output_offset
1892 + (h->got.offset &~ (bfd_vma) 1));
1893
1894 /* If this is a static link, or it is a -Bsymbolic link and the
1895 symbol is defined locally or was forced to be local because
1896 of a version file, we just want to emit a RELATIVE reloc.
1897 The entry in the global offset table will already have been
1898 initialized in the relocate_section function. */
1899 if (! elf_hash_table (info)->dynamic_sections_created
1900 || (info->shared
1901 && (info->symbolic || h->dynindx == -1)
1902 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1903 {
1904 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
1905 rela.r_addend = (h->root.u.def.value
1906 + h->root.u.def.section->output_section->vma
1907 + h->root.u.def.section->output_offset);
1908 }
1909 else
1910 {
1911 BFD_ASSERT((h->got.offset & 1) == 0);
1912 bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
1913 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
1914 rela.r_addend = 0;
1915 }
1916
1917 bfd_elf64_swap_reloca_out (output_bfd, &rela,
1918 ((Elf64_External_Rela *) srela->contents
1919 + srela->reloc_count));
1920 ++srela->reloc_count;
1921 }
1922
1923 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1924 {
1925 asection *s;
1926 Elf_Internal_Rela rela;
1927
1928 /* This symbols needs a copy reloc. Set it up. */
1929
1930 BFD_ASSERT (h->dynindx != -1
1931 && (h->root.type == bfd_link_hash_defined
1932 || h->root.type == bfd_link_hash_defweak));
1933
1934
1935 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1936 ".rela.bss");
1937 BFD_ASSERT (s != NULL);
1938
1939 rela.r_offset = (h->root.u.def.value
1940 + h->root.u.def.section->output_section->vma
1941 + h->root.u.def.section->output_offset);
1942 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
1943 rela.r_addend = 0;
1944 bfd_elf64_swap_reloca_out (output_bfd, &rela,
1945 ((Elf64_External_Rela *) s->contents
1946 + s->reloc_count));
1947 ++s->reloc_count;
1948 }
1949
1950 /* Mark some specially defined symbols as absolute. */
1951 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1952 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
1953 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
1954 sym->st_shndx = SHN_ABS;
1955
1956 return true;
1957 }
1958
1959 /* Finish up the dynamic sections. */
1960
1961 static boolean
1962 elf_s390_finish_dynamic_sections (output_bfd, info)
1963 bfd *output_bfd;
1964 struct bfd_link_info *info;
1965 {
1966 bfd *dynobj;
1967 asection *sdyn;
1968 asection *sgot;
1969
1970 dynobj = elf_hash_table (info)->dynobj;
1971
1972 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1973 BFD_ASSERT (sgot != NULL);
1974 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1975
1976 if (elf_hash_table (info)->dynamic_sections_created)
1977 {
1978 asection *splt;
1979 Elf64_External_Dyn *dyncon, *dynconend;
1980
1981 BFD_ASSERT (sdyn != NULL);
1982
1983 dyncon = (Elf64_External_Dyn *) sdyn->contents;
1984 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
1985 for (; dyncon < dynconend; dyncon++)
1986 {
1987 Elf_Internal_Dyn dyn;
1988 const char *name;
1989 asection *s;
1990
1991 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
1992
1993 switch (dyn.d_tag)
1994 {
1995 default:
1996 break;
1997
1998 case DT_PLTGOT:
1999 name = ".got";
2000 goto get_vma;
2001 case DT_JMPREL:
2002 name = ".rela.plt";
2003 get_vma:
2004 s = bfd_get_section_by_name(output_bfd, name);
2005 BFD_ASSERT (s != NULL);
2006 dyn.d_un.d_ptr = s->vma;
2007 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
2008 break;
2009
2010 case DT_PLTRELSZ:
2011 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2012 BFD_ASSERT (s != NULL);
2013 if (s->_cooked_size != 0)
2014 dyn.d_un.d_val = s->_cooked_size;
2015 else
2016 dyn.d_un.d_val = s->_raw_size;
2017 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
2018 break;
2019
2020 case DT_RELASZ:
2021 /* The procedure linkage table relocs (DT_JMPREL) should
2022 not be included in the overall relocs (DT_RELA).
2023 Therefore, we override the DT_RELASZ entry here to
2024 make it not include the JMPREL relocs. Since the
2025 linker script arranges for .rela.plt to follow all
2026 other relocation sections, we don't have to worry
2027 about changing the DT_RELA entry. */
2028 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2029 if (s != NULL)
2030 {
2031 if (s->_cooked_size != 0)
2032 dyn.d_un.d_val -= s->_cooked_size;
2033 else
2034 dyn.d_un.d_val -= s->_raw_size;
2035 }
2036 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
2037 break;
2038 }
2039 }
2040
2041 /* Fill in the special first entry in the procedure linkage table. */
2042 splt = bfd_get_section_by_name (dynobj, ".plt");
2043 if (splt && splt->_raw_size > 0)
2044 {
2045 /* fill in blueprint for plt 0 entry */
2046 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD0,
2047 splt->contents );
2048 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD1,
2049 splt->contents +4 );
2050 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD3,
2051 splt->contents +12 );
2052 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD4,
2053 splt->contents +16 );
2054 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD5,
2055 splt->contents +20 );
2056 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD6,
2057 splt->contents + 24);
2058 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD7,
2059 splt->contents + 28 );
2060 /* Fixup relative address to start of GOT */
2061 bfd_put_32 (output_bfd,
2062 (sgot->output_section->vma + sgot->output_offset
2063 - splt->output_section->vma - 6)/2,
2064 splt->contents + 8);
2065 }
2066
2067 elf_section_data (splt->output_section)->this_hdr.sh_entsize =
2068 PLT_ENTRY_SIZE;
2069 }
2070
2071 /* Set the first entry in the global offset table to the address of
2072 the dynamic section. */
2073 if (sgot->_raw_size > 0)
2074 {
2075 if (sdyn == NULL)
2076 bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents);
2077 else
2078 bfd_put_64 (output_bfd,
2079 sdyn->output_section->vma + sdyn->output_offset,
2080 sgot->contents);
2081
2082 /* One entry for shared object struct ptr. */
2083 bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2084 /* One entry for _dl_runtime_resolve. */
2085 bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + 12);
2086 }
2087
2088 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 8;
2089
2090 return true;
2091 }
2092
2093 static boolean
2094 elf_s390_object_p (abfd)
2095 bfd *abfd;
2096 {
2097 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_esame);
2098 }
2099
2100
2101 static enum elf_reloc_type_class
2102 elf_s390_reloc_type_class (type)
2103 int type;
2104 {
2105 switch (type)
2106 {
2107 case R_390_RELATIVE:
2108 return reloc_class_relative;
2109 case R_390_JMP_SLOT:
2110 return reloc_class_plt;
2111 case R_390_COPY:
2112 return reloc_class_copy;
2113 default:
2114 return reloc_class_normal;
2115 }
2116 }
2117
2118 /*
2119 * Why was the hash table entry size definition changed from
2120 * ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
2121 * this is the only reason for the s390_elf64_size_info structure.
2122 */
2123
2124 const struct elf_size_info s390_elf64_size_info =
2125 {
2126 sizeof (Elf64_External_Ehdr),
2127 sizeof (Elf64_External_Phdr),
2128 sizeof (Elf64_External_Shdr),
2129 sizeof (Elf64_External_Rel),
2130 sizeof (Elf64_External_Rela),
2131 sizeof (Elf64_External_Sym),
2132 sizeof (Elf64_External_Dyn),
2133 sizeof (Elf_External_Note),
2134 8, /* hash-table entry size */
2135 1, /* internal relocations per external relocations */
2136 64, /* arch_size */
2137 8, /* file_align */
2138 ELFCLASS64, EV_CURRENT,
2139 bfd_elf64_write_out_phdrs,
2140 bfd_elf64_write_shdrs_and_ehdr,
2141 bfd_elf64_write_relocs,
2142 bfd_elf64_swap_symbol_out,
2143 bfd_elf64_slurp_reloc_table,
2144 bfd_elf64_slurp_symbol_table,
2145 bfd_elf64_swap_dyn_in,
2146 bfd_elf64_swap_dyn_out,
2147 NULL,
2148 NULL,
2149 NULL,
2150 NULL
2151 };
2152
2153 #define TARGET_BIG_SYM bfd_elf64_s390_vec
2154 #define TARGET_BIG_NAME "elf64-s390"
2155 #define ELF_ARCH bfd_arch_s390
2156 #define ELF_MACHINE_CODE EM_S390
2157 #define ELF_MACHINE_ALT1 EM_S390_OLD
2158 #define ELF_MAXPAGESIZE 0x1000
2159
2160 #define elf_backend_size_info s390_elf64_size_info
2161
2162 #define elf_backend_can_gc_sections 1
2163 #define elf_backend_want_got_plt 1
2164 #define elf_backend_plt_readonly 1
2165 #define elf_backend_want_plt_sym 0
2166 #define elf_backend_got_header_size 24
2167 #define elf_backend_plt_header_size PLT_ENTRY_SIZE
2168
2169 #define elf_info_to_howto elf_s390_info_to_howto
2170
2171 #define bfd_elf64_bfd_final_link _bfd_elf64_gc_common_final_link
2172 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
2173 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
2174 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
2175
2176 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
2177 #define elf_backend_check_relocs elf_s390_check_relocs
2178 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
2179 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
2180 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
2181 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
2182 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
2183 #define elf_backend_relocate_section elf_s390_relocate_section
2184 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
2185 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
2186
2187 #define elf_backend_object_p elf_s390_object_p
2188
2189 #include "elf64-target.h"
git-cvsimport of binutils cvsroot