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Declare BSIZE as static
[deliverable/binutils-gdb.git] / bfd / elf32-s390.c
CommitLineData
a85d7ed0 1/* IBM S/390-specific support for 32-bit ELF
7898deda 2 Copyright 2000, 2001 Free Software Foundation, Inc.
a85d7ed0
NC		 3 Contributed by Carl B. Pedersen and Martin Schwidefsky.
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 *));
32static boolean elf_s390_is_local_label_name PARAMS ((bfd *, const char *));
33static struct bfd_hash_entry *elf_s390_link_hash_newfunc
34 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
35static struct bfd_link_hash_table *elf_s390_link_hash_table_create
36 PARAMS ((bfd *));
37static boolean elf_s390_check_relocs
38 PARAMS ((bfd *, struct bfd_link_info *, asection *,
39 const Elf_Internal_Rela *));
5a65713f
AJ		 40static asection *elf_s390_gc_mark_hook
41 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
42 struct elf_link_hash_entry *, Elf_Internal_Sym *sym));
43static boolean elf_s390_gc_sweep_hook
44 PARAMS ((bfd *, struct bfd_link_info *, asection *,
45 const Elf_Internal_Rela *));
a85d7ed0
NC		 46static boolean elf_s390_adjust_dynamic_symbol
47 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
48static boolean elf_s390_size_dynamic_sections
49 PARAMS ((bfd *, struct bfd_link_info *));
50static boolean elf_s390_relocate_section
51 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
52 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
53static boolean elf_s390_finish_dynamic_symbol
54 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
55 Elf_Internal_Sym *));
56static boolean elf_s390_finish_dynamic_sections
57 PARAMS ((bfd *, struct bfd_link_info *));
5a65713f 58static boolean elf_s390_object_p PARAMS ((bfd *));
a85d7ed0
NC		 59
60#define USE_RELA 1 /* We want RELA relocations, not REL. */
61
62#include "elf/s390.h"
63
64/* The relocation "howto" table. */
65
66static reloc_howto_type elf_howto_table[] =
67{
68 HOWTO (R_390_NONE, /* type */
69 0, /* rightshift */
70 0, /* size (0 = byte, 1 = short, 2 = long) */
71 0, /* bitsize */
72 false, /* pc_relative */
73 0, /* bitpos */
74 complain_overflow_dont, /* complain_on_overflow */
75 bfd_elf_generic_reloc, /* special_function */
76 "R_390_NONE", /* name */
77 false, /* partial_inplace */
78 0, /* src_mask */
79 0, /* dst_mask */
80 false), /* pcrel_offset */
81
82 HOWTO(R_390_8, 0, 0, 8, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false),
83 HOWTO(R_390_12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false),
84 HOWTO(R_390_16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false),
85 HOWTO(R_390_32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false),
86 HOWTO(R_390_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true),
87 HOWTO(R_390_GOT12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false),
88 HOWTO(R_390_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false),
89 HOWTO(R_390_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true),
90 HOWTO(R_390_COPY, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_COPY", false, 0,0xffffffff, false),
91 HOWTO(R_390_GLOB_DAT, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GLOB_DAT",false, 0,0xffffffff, false),
92 HOWTO(R_390_JMP_SLOT, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_JMP_SLOT",false, 0,0xffffffff, false),
93 HOWTO(R_390_RELATIVE, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_RELATIVE",false, 0,0xffffffff, false),
94 HOWTO(R_390_GOTOFF, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTOFF", false, 0,0xffffffff, false),
95 HOWTO(R_390_GOTPC, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,0xffffffff, true),
96 HOWTO(R_390_GOT16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false),
97 HOWTO(R_390_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true),
98 HOWTO(R_390_PC16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true),
99 HOWTO(R_390_PLT16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true),
100};
101
102/* GNU extension to record C++ vtable hierarchy. */
103static reloc_howto_type elf32_s390_vtinherit_howto =
104 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false);
105static reloc_howto_type elf32_s390_vtentry_howto =
106 HOWTO (R_390_GNU_VTENTRY, 0,2,0,false,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", false,0,0, false);
107
108static reloc_howto_type *
109elf_s390_reloc_type_lookup (abfd, code)
110 bfd *abfd ATTRIBUTE_UNUSED;
111 bfd_reloc_code_real_type code;
112{
113 switch (code) {
114 case BFD_RELOC_NONE:
115 return &elf_howto_table[(int) R_390_NONE];
116 case BFD_RELOC_8:
117 return &elf_howto_table[(int) R_390_8];
118 case BFD_RELOC_390_12:
119 return &elf_howto_table[(int) R_390_12];
120 case BFD_RELOC_16:
121 return &elf_howto_table[(int) R_390_16];
122 case BFD_RELOC_32:
123 return &elf_howto_table[(int) R_390_32];
124 case BFD_RELOC_CTOR:
125 return &elf_howto_table[(int) R_390_32];
126 case BFD_RELOC_32_PCREL:
127 return &elf_howto_table[(int) R_390_PC32];
128 case BFD_RELOC_390_GOT12:
129 return &elf_howto_table[(int) R_390_GOT12];
130 case BFD_RELOC_32_GOT_PCREL:
131 return &elf_howto_table[(int) R_390_GOT32];
132 case BFD_RELOC_390_PLT32:
133 return &elf_howto_table[(int) R_390_PLT32];
134 case BFD_RELOC_390_COPY:
135 return &elf_howto_table[(int) R_390_COPY];
136 case BFD_RELOC_390_GLOB_DAT:
137 return &elf_howto_table[(int) R_390_GLOB_DAT];
138 case BFD_RELOC_390_JMP_SLOT:
139 return &elf_howto_table[(int) R_390_JMP_SLOT];
140 case BFD_RELOC_390_RELATIVE:
141 return &elf_howto_table[(int) R_390_RELATIVE];
142 case BFD_RELOC_32_GOTOFF:
143 return &elf_howto_table[(int) R_390_GOTOFF];
144 case BFD_RELOC_390_GOTPC:
145 return &elf_howto_table[(int) R_390_GOTPC];
146 case BFD_RELOC_390_GOT16:
147 return &elf_howto_table[(int) R_390_GOT16];
148 case BFD_RELOC_16_PCREL:
149 return &elf_howto_table[(int) R_390_PC16];
150 case BFD_RELOC_390_PC16DBL:
151 return &elf_howto_table[(int) R_390_PC16DBL];
152 case BFD_RELOC_390_PLT16DBL:
153 return &elf_howto_table[(int) R_390_PLT16DBL];
154 case BFD_RELOC_VTABLE_INHERIT:
155 return &elf32_s390_vtinherit_howto;
156 case BFD_RELOC_VTABLE_ENTRY:
157 return &elf32_s390_vtentry_howto;
158 default:
159 break;
160 }
161 return 0;
162}
163
164/* We need to use ELF32_R_TYPE so we have our own copy of this function,
165 and elf32-s390.c has its own copy. */
166
167static void
168elf_s390_info_to_howto (abfd, cache_ptr, dst)
169 bfd *abfd ATTRIBUTE_UNUSED;
170 arelent *cache_ptr;
171 Elf_Internal_Rela *dst;
172{
173 switch (ELF32_R_TYPE(dst->r_info))
174 {
175 case R_390_GNU_VTINHERIT:
176 cache_ptr->howto = &elf32_s390_vtinherit_howto;
177 break;
178
179 case R_390_GNU_VTENTRY:
180 cache_ptr->howto = &elf32_s390_vtentry_howto;
181 break;
182
183 default:
184 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_390_max);
185 cache_ptr->howto = &elf_howto_table[ELF32_R_TYPE(dst->r_info)];
186 }
187}
188
189static boolean
190elf_s390_is_local_label_name (abfd, name)
191 bfd *abfd;
192 const char *name;
193{
194 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
195 return true;
196
197 return _bfd_elf_is_local_label_name (abfd, name);
198}
199
200/* Functions for the 390 ELF linker. */
201
202/* The name of the dynamic interpreter. This is put in the .interp
203 section. */
204
205#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
206
207/* The nop opcode we use. */
208
209#define s390_NOP 0x07070707
210
211
212/* The size in bytes of the first entry in the procedure linkage table. */
213#define PLT_FIRST_ENTRY_SIZE 32
214/* The size in bytes of an entry in the procedure linkage table. */
215#define PLT_ENTRY_SIZE 32
216
217#define GOT_ENTRY_SIZE 4
218
219/* The first three entries in a procedure linkage table are reserved,
220 and the initial contents are unimportant (we zero them out).
221 Subsequent entries look like this. See the SVR4 ABI 386
222 supplement to see how this works. */
223
224/* For the s390, simple addr offset can only be 0 - 4096.
225 To use the full 2 GB address space, several instructions
226 are needed to load an address in a register and execute
227 a branch( or just saving the address)
228
229 Furthermore, only r 0 and 1 are free to use!!! */
230
231/* The first 3 words in the GOT are then reserved.
232 Word 0 is the address of the dynamic table.
233 Word 1 is a pointer to a structure describing the object
234 Word 2 is used to point to the loader entry address.
235
236 The code for position independand PLT entries looks like this:
237
238 r12 holds addr of the current GOT at entry to the PLT
239
240 The GOT holds the address in the PLT to be executed.
241 The loader then gets:
242 24(15) = Pointer to the structure describing the object.
243 28(15) = Offset in symbol table
244
245 The loader must then find the module where the function is
246 and insert the address in the GOT.
247
248 Note: 390 can only address +- 64 K relative.
249 We check if offset > 65536, then make a relative branch -64xxx
250 back to a previous defined branch
251
252PLT1: BASR 1,0 # 2 bytes
253 L 1,22(1) # 4 bytes Load offset in GOT in r 1
254 L 1,(1,12) # 4 bytes Load address from GOT in r1
255 BCR 15,1 # 2 bytes Jump to address
256RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
257 L 1,14(1) # 4 bytes Load offset in symol table in r1
258 BRC 15,-x # 4 bytes Jump to start of PLT
259 .word 0 # 2 bytes filler
260 .long ? # 4 bytes offset in GOT
261 .long ? # 4 bytes offset into symbol table
262
263 This was the general case. There are two additional, optimizes PLT
264 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768.
265 First the one for GOT offsets < 4096:
266
267PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1
268 BCR 15,1 # 2 bytes Jump to address
269 .word 0,0,0 # 6 bytes filler
270RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
271 L 1,14(1) # 4 bytes Load offset in symbol table in r1
272 BRC 15,-x # 4 bytes Jump to start of PLT
273 .word 0,0,0 # 6 bytes filler
274 .long ? # 4 bytes offset into symbol table
275
276 Second the one for GOT offsets < 32768:
277
278PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1
279 L 1,(1,12) # 4 bytes Load address from GOT to r1
280 BCR 15,1 # 2 bytes Jump to address
281 .word 0 # 2 bytes filler
282RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
283 L 1,14(1) # 4 bytes Load offset in symbol table in r1
284 BRC 15,-x # 4 bytes Jump to start of PLT
285 .word 0,0,0 # 6 bytes filler
286 .long ? # 4 bytes offset into symbol table
287
288Total = 32 bytes per PLT entry
289
290 The code for static build PLT entries looks like this:
291
292PLT1: BASR 1,0 # 2 bytes
293 L 1,22(1) # 4 bytes Load address of GOT entry
294 L 1,0(0,1) # 4 bytes Load address from GOT in r1
295 BCR 15,1 # 2 bytes Jump to address
296RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
297 L 1,14(1) # 4 bytes Load offset in symbol table in r1
298 BRC 15,-x # 4 bytes Jump to start of PLT
299 .word 0 # 2 bytes filler
300 .long ? # 4 bytes address of GOT entry
301 .long ? # 4 bytes offset into symbol table */
302
303#define PLT_PIC_ENTRY_WORD0 0x0d105810
304#define PLT_PIC_ENTRY_WORD1 0x10165811
305#define PLT_PIC_ENTRY_WORD2 0xc00007f1
306#define PLT_PIC_ENTRY_WORD3 0x0d105810
307#define PLT_PIC_ENTRY_WORD4 0x100ea7f4
308
309#define PLT_PIC12_ENTRY_WORD0 0x5810c000
310#define PLT_PIC12_ENTRY_WORD1 0x07f10000
311#define PLT_PIC12_ENTRY_WORD2 0x00000000
312#define PLT_PIC12_ENTRY_WORD3 0x0d105810
313#define PLT_PIC12_ENTRY_WORD4 0x100ea7f4
314
315#define PLT_PIC16_ENTRY_WORD0 0xa7180000
316#define PLT_PIC16_ENTRY_WORD1 0x5811c000
317#define PLT_PIC16_ENTRY_WORD2 0x07f10000
318#define PLT_PIC16_ENTRY_WORD3 0x0d105810
319#define PLT_PIC16_ENTRY_WORD4 0x100ea7f4
320
321#define PLT_ENTRY_WORD0 0x0d105810
322#define PLT_ENTRY_WORD1 0x10165810
323#define PLT_ENTRY_WORD2 0x100007f1
324#define PLT_ENTRY_WORD3 0x0d105810
325#define PLT_ENTRY_WORD4 0x100ea7f4
326
327/* The first PLT entry pushes the offset into the symbol table
328 from R1 onto the stack at 8(15) and the loader object info
329 at 12(15), loads the loader address in R1 and jumps to it. */
330
331/* The first entry in the PLT for PIC code:
332
333PLT0:
334 ST 1,28(15) # R1 has offset into symbol table
335 L 1,4(12) # Get loader ino(object struct address)
336 ST 1,24(15) # Store address
337 L 1,8(12) # Entry address of loader in R1
338 BR 1 # Jump to loader
339
340 The first entry in the PLT for static code:
341
342PLT0:
343 ST 1,28(15) # R1 has offset into symbol table
344 BASR 1,0
345 L 1,18(0,1) # Get address of GOT
346 MVC 24(4,15),4(1) # Move loader ino to stack
347 L 1,8(1) # Get address of loader
348 BR 1 # Jump to loader
349 .word 0 # filler
350 .long got # address of GOT */
351
352#define PLT_PIC_FIRST_ENTRY_WORD0 0x5010f01c
353#define PLT_PIC_FIRST_ENTRY_WORD1 0x5810c004
354#define PLT_PIC_FIRST_ENTRY_WORD2 0x5010f018
355#define PLT_PIC_FIRST_ENTRY_WORD3 0x5810c008
356#define PLT_PIC_FIRST_ENTRY_WORD4 0x07f10000
357
358#define PLT_FIRST_ENTRY_WORD0 0x5010f01c
359#define PLT_FIRST_ENTRY_WORD1 0x0d105810
360#define PLT_FIRST_ENTRY_WORD2 0x1012D203
361#define PLT_FIRST_ENTRY_WORD3 0xf0181004
362#define PLT_FIRST_ENTRY_WORD4 0x58101008
363#define PLT_FIRST_ENTRY_WORD5 0x07f10000
364
365/* The s390 linker needs to keep track of the number of relocs that it
366 decides to copy in check_relocs for each symbol. This is so that
367 it can discard PC relative relocs if it doesn't need them when
368 linking with -Bsymbolic. We store the information in a field
369 extending the regular ELF linker hash table. */
370
371/* This structure keeps track of the number of PC relative relocs we
372 have copied for a given symbol. */
373
374struct elf_s390_pcrel_relocs_copied
375{
376 /* Next section. */
377 struct elf_s390_pcrel_relocs_copied *next;
378 /* A section in dynobj. */
379 asection *section;
380 /* Number of relocs copied in this section. */
381 bfd_size_type count;
382};
383
384/* s390 ELF linker hash entry. */
385
386struct elf_s390_link_hash_entry
387{
388 struct elf_link_hash_entry root;
389
390 /* Number of PC relative relocs copied for this symbol. */
391 struct elf_s390_pcrel_relocs_copied *pcrel_relocs_copied;
392};
393
394/* s390 ELF linker hash table. */
395
396struct elf_s390_link_hash_table
397{
398 struct elf_link_hash_table root;
399};
400
401/* Declare this now that the above structures are defined. */
402
403static boolean elf_s390_discard_copies
404 PARAMS ((struct elf_s390_link_hash_entry *, PTR));
405
406/* Traverse an s390 ELF linker hash table. */
407
408#define elf_s390_link_hash_traverse(table, func, info) \
409 (elf_link_hash_traverse \
410 (&(table)->root, \
411 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
412 (info)))
413
414/* Get the s390 ELF linker hash table from a link_info structure. */
415
416#define elf_s390_hash_table(p) \
417 ((struct elf_s390_link_hash_table *) ((p)->hash))
418
419/* Create an entry in an s390 ELF linker hash table. */
420
421static struct bfd_hash_entry *
422elf_s390_link_hash_newfunc (entry, table, string)
423 struct bfd_hash_entry *entry;
424 struct bfd_hash_table *table;
425 const char *string;
426{
427 struct elf_s390_link_hash_entry *ret =
428 (struct elf_s390_link_hash_entry *) entry;
429
430 /* Allocate the structure if it has not already been allocated by a
431 subclass. */
432 if (ret == (struct elf_s390_link_hash_entry *) NULL)
433 ret = ((struct elf_s390_link_hash_entry *)
434 bfd_hash_allocate (table,
435 sizeof (struct elf_s390_link_hash_entry)));
436 if (ret == (struct elf_s390_link_hash_entry *) NULL)
437 return (struct bfd_hash_entry *) ret;
438
439 /* Call the allocation method of the superclass. */
440 ret = ((struct elf_s390_link_hash_entry *)
441 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
442 table, string));
443 if (ret != (struct elf_s390_link_hash_entry *) NULL)
444 {
445 ret->pcrel_relocs_copied = NULL;
446 }
447
448 return (struct bfd_hash_entry *) ret;
449}
450
451/* Create an s390 ELF linker hash table. */
452
453static struct bfd_link_hash_table *
454elf_s390_link_hash_table_create (abfd)
455 bfd *abfd;
456{
457 struct elf_s390_link_hash_table *ret;
458
459 ret = ((struct elf_s390_link_hash_table *)
460 bfd_alloc (abfd, sizeof (struct elf_s390_link_hash_table)));
461 if (ret == (struct elf_s390_link_hash_table *) NULL)
462 return NULL;
463
464 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
465 elf_s390_link_hash_newfunc))
466 {
467 bfd_release (abfd, ret);
468 return NULL;
469 }
470
471 return &ret->root.root;
472}
473
474
475/* Look through the relocs for a section during the first phase, and
476 allocate space in the global offset table or procedure linkage
477 table. */
478
479static boolean
480elf_s390_check_relocs (abfd, info, sec, relocs)
481 bfd *abfd;
482 struct bfd_link_info *info;
483 asection *sec;
484 const Elf_Internal_Rela *relocs;
485{
486 bfd *dynobj;
487 Elf_Internal_Shdr *symtab_hdr;
488 struct elf_link_hash_entry **sym_hashes;
489 bfd_signed_vma *local_got_refcounts;
490 const Elf_Internal_Rela *rel;
491 const Elf_Internal_Rela *rel_end;
492 asection *sgot;
493 asection *srelgot;
494 asection *sreloc;
495
496 if (info->relocateable)
497 return true;
498
499 dynobj = elf_hash_table (info)->dynobj;
500 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
501 sym_hashes = elf_sym_hashes (abfd);
502 local_got_refcounts = elf_local_got_offsets (abfd);
503
504 sgot = NULL;
505 srelgot = NULL;
506 sreloc = NULL;
507
508 rel_end = relocs + sec->reloc_count;
509 for (rel = relocs; rel < rel_end; rel++)
510 {
511 unsigned long r_symndx;
512 struct elf_link_hash_entry *h;
513
514 r_symndx = ELF32_R_SYM (rel->r_info);
515
516 if (r_symndx < symtab_hdr->sh_info)
517 h = NULL;
518 else
519 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
520
521 /* Some relocs require a global offset table. */
522 if (dynobj == NULL)
523 {
524 switch (ELF32_R_TYPE (rel->r_info))
525 {
526 case R_390_GOT12:
527 case R_390_GOT16:
528 case R_390_GOT32:
529 case R_390_GOTOFF:
530 case R_390_GOTPC:
531 elf_hash_table (info)->dynobj = dynobj = abfd;
532 if (! _bfd_elf_create_got_section (dynobj, info))
533 return false;
534 break;
535
536 default:
537 break;
538 }
539 }
540
541
542 switch (ELF32_R_TYPE (rel->r_info))
543 {
544 case R_390_GOT12:
545 case R_390_GOT16:
546 case R_390_GOT32:
547 /* This symbol requires a global offset table entry. */
548
549 if (sgot == NULL)
550 {
551 sgot = bfd_get_section_by_name (dynobj, ".got");
552 BFD_ASSERT (sgot != NULL);
553 }
554
555
556 if (srelgot == NULL
557 && (h != NULL || info->shared))
558 {
559 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
560 if (srelgot == NULL)
561 {
562 srelgot = bfd_make_section (dynobj, ".rela.got");
563 if (srelgot == NULL
564 || ! bfd_set_section_flags (dynobj, srelgot,
565 (SEC_ALLOC
566 | SEC_LOAD
567 | SEC_HAS_CONTENTS
568 | SEC_IN_MEMORY
569 | SEC_LINKER_CREATED
570 | SEC_READONLY))
571 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
572 return false;
573 }
574 }
575
576 if (h != NULL)
577 {
578 if (h->got.refcount == -1)
579 {
580 h->got.refcount = 1;
581
582 /* Make sure this symbol is output as a dynamic symbol. */
583 if (h->dynindx == -1)
584 {
585 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
586 return false;
587 }
588
589 sgot->_raw_size += 4;
590 srelgot->_raw_size += sizeof (Elf32_External_Rela);
591 }
592 else
593 h->got.refcount += 1;
594 }
595 else
596 {
597 /* This is a global offset table entry for a local symbol. */
598 if (local_got_refcounts == NULL)
599 {
600 size_t size;
601
602 size = symtab_hdr->sh_info * sizeof (bfd_signed_vma);
603 local_got_refcounts = (bfd_signed_vma *)
604 bfd_alloc (abfd, size);
605 if (local_got_refcounts == NULL)
606 return false;
607 elf_local_got_refcounts (abfd) = local_got_refcounts;
608 memset (local_got_refcounts, -1, size);
609 }
610 if (local_got_refcounts[r_symndx] == -1)
611 {
612 local_got_refcounts[r_symndx] = 1;
613
614 sgot->_raw_size += 4;
615 if (info->shared)
616 {
617 /* If we are generating a shared object, we need to
618 output a R_390_RELATIVE reloc so that the dynamic
619 linker can adjust this GOT entry. */
620 srelgot->_raw_size += sizeof (Elf32_External_Rela);
621 }
622 }
623 else
624 local_got_refcounts[r_symndx] += 1;
625 }
626 break;
627
628 case R_390_PLT16DBL:
629 case R_390_PLT32:
630 /* This symbol requires a procedure linkage table entry. We
631 actually build the entry in adjust_dynamic_symbol,
632 because this might be a case of linking PIC code which is
633 never referenced by a dynamic object, in which case we
634 don't need to generate a procedure linkage table entry
635 after all. */
636
637 /* If this is a local symbol, we resolve it directly without
638 creating a procedure linkage table entry. */
639 if (h == NULL)
640 continue;
641
642 if (h->plt.refcount == -1)
643 {
644 h->plt.refcount = 1;
645 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
646 }
647 else
648 h->plt.refcount += 1;
649 break;
650
651 case R_390_8:
652 case R_390_16:
653 case R_390_32:
654 case R_390_PC16:
655 case R_390_PC16DBL:
656 case R_390_PC32:
657 if (h != NULL)
658 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
659
660 /* If we are creating a shared library, and this is a reloc
661 against a global symbol, or a non PC relative reloc
662 against a local symbol, then we need to copy the reloc
663 into the shared library. However, if we are linking with
664 -Bsymbolic, we do not need to copy a reloc against a
665 global symbol which is defined in an object we are
666 including in the link (i.e., DEF_REGULAR is set). At
667 this point we have not seen all the input files, so it is
668 possible that DEF_REGULAR is not set now but will be set
669 later (it is never cleared). We account for that
670 possibility below by storing information in the
671 pcrel_relocs_copied field of the hash table entry. */
672 if (info->shared
673 && (sec->flags & SEC_ALLOC) != 0
674 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16 &&
675 ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL &&
676 ELF32_R_TYPE (rel->r_info) != R_390_PC32)
677 || (h != NULL
678 && (! info->symbolic
679 || (h->elf_link_hash_flags
680 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
681 {
682 /* When creating a shared object, we must copy these
683 reloc types into the output file. We create a reloc
684 section in dynobj and make room for this reloc. */
685 if (sreloc == NULL)
686 {
687 const char *name;
688
689 name = (bfd_elf_string_from_elf_section
690 (abfd,
691 elf_elfheader (abfd)->e_shstrndx,
692 elf_section_data (sec)->rel_hdr.sh_name));
693 if (name == NULL)
694 return false;
695
696 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
697 && strcmp (bfd_get_section_name (abfd, sec),
698 name + 5) == 0);
699
700 sreloc = bfd_get_section_by_name (dynobj, name);
701 if (sreloc == NULL)
702 {
703 flagword flags;
704
705 sreloc = bfd_make_section (dynobj, name);
706 flags = (SEC_HAS_CONTENTS | SEC_READONLY
707 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
708 if ((sec->flags & SEC_ALLOC) != 0)
709 flags |= SEC_ALLOC | SEC_LOAD;
710 if (sreloc == NULL
711 || ! bfd_set_section_flags (dynobj, sreloc, flags)
712 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
713 return false;
714 }
715 }
716
717 sreloc->_raw_size += sizeof (Elf32_External_Rela);
718
719 /* If we are linking with -Bsymbolic, and this is a
720 global symbol, we count the number of PC relative
721 relocations we have entered for this symbol, so that
722 we can discard them again if the symbol is later
723 defined by a regular object. Note that this function
724 is only called if we are using an elf_s390 linker
725 hash table, which means that h is really a pointer to
726 an elf_s390_link_hash_entry. */
727 if (h != NULL
728 && (ELF32_R_TYPE (rel->r_info) == R_390_PC16 ||
729 ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL ||
730 ELF32_R_TYPE (rel->r_info) == R_390_PC32))
731 {
732 struct elf_s390_link_hash_entry *eh;
733 struct elf_s390_pcrel_relocs_copied *p;
734
735 eh = (struct elf_s390_link_hash_entry *) h;
736
737 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
738 if (p->section == sreloc)
739 break;
740
741 if (p == NULL)
742 {
743 p = ((struct elf_s390_pcrel_relocs_copied *)
744 bfd_alloc (dynobj, sizeof *p));
745 if (p == NULL)
746 return false;
747 p->next = eh->pcrel_relocs_copied;
748 eh->pcrel_relocs_copied = p;
749 p->section = sreloc;
750 p->count = 0;
751 }
752
753 ++p->count;
754 }
755 }
756
757 break;
758
759 /* This relocation describes the C++ object vtable hierarchy.
760 Reconstruct it for later use during GC. */
761 case R_390_GNU_VTINHERIT:
762 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
763 return false;
764 break;
765
766 /* This relocation describes which C++ vtable entries are actually
767 used. Record for later use during GC. */
768 case R_390_GNU_VTENTRY:
769 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
770 return false;
771 break;
772
773 default:
774 break;
775 }
776 }
777
778 return true;
779}
780
781/* Return the section that should be marked against GC for a given
782 relocation. */
783
784static asection *
785elf_s390_gc_mark_hook (abfd, info, rel, h, sym)
786 bfd *abfd;
787 struct bfd_link_info *info ATTRIBUTE_UNUSED;
788 Elf_Internal_Rela *rel;
789 struct elf_link_hash_entry *h;
790 Elf_Internal_Sym *sym;
791{
792 if (h != NULL)
793 {
794 switch (ELF32_R_TYPE (rel->r_info))
795 {
796 case R_390_GNU_VTINHERIT:
797 case R_390_GNU_VTENTRY:
798 break;
799
800 default:
801 switch (h->root.type)
802 {
803 case bfd_link_hash_defined:
804 case bfd_link_hash_defweak:
805 return h->root.u.def.section;
806
807 case bfd_link_hash_common:
808 return h->root.u.c.p->section;
809
810 default:
811 break;
812 }
813 }
814 }
815 else
816 {
817 if (!(elf_bad_symtab (abfd)
818 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
819 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
820 && sym->st_shndx != SHN_COMMON))
821 {
822 return bfd_section_from_elf_index (abfd, sym->st_shndx);
823 }
824 }
825
826 return NULL;
827}
828
829/* Update the got entry reference counts for the section being removed. */
830
831static boolean
832elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
833 bfd *abfd ATTRIBUTE_UNUSED;
834 struct bfd_link_info *info ATTRIBUTE_UNUSED;
835 asection *sec ATTRIBUTE_UNUSED;
836 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
837{
838 Elf_Internal_Shdr *symtab_hdr;
839 struct elf_link_hash_entry **sym_hashes;
840 bfd_signed_vma *local_got_refcounts;
841 const Elf_Internal_Rela *rel, *relend;
842 unsigned long r_symndx;
843 struct elf_link_hash_entry *h;
844 bfd *dynobj;
845 asection *sgot;
846 asection *srelgot;
847
848 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
849 sym_hashes = elf_sym_hashes (abfd);
850 local_got_refcounts = elf_local_got_refcounts (abfd);
851
852 dynobj = elf_hash_table (info)->dynobj;
853 if (dynobj == NULL)
854 return true;
855
856 sgot = bfd_get_section_by_name (dynobj, ".got");
857 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
858
859 relend = relocs + sec->reloc_count;
860 for (rel = relocs; rel < relend; rel++)
861 switch (ELF32_R_TYPE (rel->r_info))
862 {
863 case R_390_GOT12:
864 case R_390_GOT16:
865 case R_390_GOT32:
866 case R_390_GOTOFF:
867 case R_390_GOTPC:
868 r_symndx = ELF32_R_SYM (rel->r_info);
869 if (r_symndx >= symtab_hdr->sh_info)
870 {
871 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
872 if (h->got.refcount > 0)
873 {
874 h->got.refcount -= 1;
875 if (h->got.refcount == 0)
876 {
877 sgot->_raw_size -= 4;
878 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
879 }
880 }
881 }
882 else if (local_got_refcounts != NULL)
883 {
884 if (local_got_refcounts[r_symndx] > 0)
885 {
886 local_got_refcounts[r_symndx] -= 1;
887 if (local_got_refcounts[r_symndx] == 0)
888 {
889 sgot->_raw_size -= 4;
890 if (info->shared)
891 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
892 }
893 }
894 }
895 break;
896
897 case R_390_PLT16DBL:
898 case R_390_PLT32:
899 r_symndx = ELF32_R_SYM (rel->r_info);
900 if (r_symndx >= symtab_hdr->sh_info)
901 {
902 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
903 if (h->plt.refcount > 0)
904 h->plt.refcount -= 1;
905 }
906 break;
907
908 default:
909 break;
910 }
911
912 return true;
913}
914
915/* Adjust a symbol defined by a dynamic object and referenced by a
916 regular object. The current definition is in some section of the
917 dynamic object, but we're not including those sections. We have to
918 change the definition to something the rest of the link can
919 understand. */
920
921static boolean
922elf_s390_adjust_dynamic_symbol (info, h)
923 struct bfd_link_info *info;
924 struct elf_link_hash_entry *h;
925{
926 bfd *dynobj;
927 asection *s;
928 unsigned int power_of_two;
929
930 dynobj = elf_hash_table (info)->dynobj;
931
932 /* Make sure we know what is going on here. */
933 BFD_ASSERT (dynobj != NULL
934 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
935 || h->weakdef != NULL
936 || ((h->elf_link_hash_flags
937 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
938 && (h->elf_link_hash_flags
939 & ELF_LINK_HASH_REF_REGULAR) != 0
940 && (h->elf_link_hash_flags
941 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
942
943 /* If this is a function, put it in the procedure linkage table. We
944 will fill in the contents of the procedure linkage table later
945 (although we could actually do it here). */
946 if (h->type == STT_FUNC
947 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
948 {
949 if ((! info->shared
950 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
951 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0)
952 || (info->shared && h->plt.refcount <= 0))
953 {
954 /* This case can occur if we saw a PLT32 reloc in an input
955 file, but the symbol was never referred to by a dynamic
956 object, or if all references were garbage collected. In
957 such a case, we don't actually need to build a procedure
958 linkage table, and we can just do a PC32 reloc instead. */
959 h->plt.offset = (bfd_vma) -1;
960 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
961 return true;
962 }
963
964 /* Make sure this symbol is output as a dynamic symbol. */
965 if (h->dynindx == -1)
966 {
967 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
968 return false;
969 }
970
971 s = bfd_get_section_by_name (dynobj, ".plt");
972 BFD_ASSERT (s != NULL);
973
974 /* The first entry in .plt is reserved. */
975 if (s->_raw_size == 0)
976 s->_raw_size = PLT_FIRST_ENTRY_SIZE;
977
978 /* If this symbol is not defined in a regular file, and we are
979 not generating a shared library, then set the symbol to this
980 location in the .plt. This is required to make function
981 pointers compare as equal between the normal executable and
982 the shared library. */
983 if (! info->shared
984 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
985 {
986 h->root.u.def.section = s;
987 h->root.u.def.value = s->_raw_size;
988 }
989
990 h->plt.offset = s->_raw_size;
991
992 /* Make room for this entry. */
993 s->_raw_size += PLT_ENTRY_SIZE;
994
995 /* We also need to make an entry in the .got.plt section, which
996 will be placed in the .got section by the linker script. */
997 s = bfd_get_section_by_name (dynobj, ".got.plt");
998 BFD_ASSERT (s != NULL);
999 s->_raw_size += GOT_ENTRY_SIZE;
1000
1001 /* We also need to make an entry in the .rela.plt section. */
1002 s = bfd_get_section_by_name (dynobj, ".rela.plt");
1003 BFD_ASSERT (s != NULL);
1004 s->_raw_size += sizeof (Elf32_External_Rela);
1005
1006 return true;
1007 }
1008
1009 /* If this is a weak symbol, and there is a real definition, the
1010 processor independent code will have arranged for us to see the
1011 real definition first, and we can just use the same value. */
1012 if (h->weakdef != NULL)
1013 {
1014 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1015 || h->weakdef->root.type == bfd_link_hash_defweak);
1016 h->root.u.def.section = h->weakdef->root.u.def.section;
1017 h->root.u.def.value = h->weakdef->root.u.def.value;
1018 return true;
1019 }
1020
1021 /* This is a reference to a symbol defined by a dynamic object which
1022 is not a function. */
1023
1024 /* If we are creating a shared library, we must presume that the
1025 only references to the symbol are via the global offset table.
1026 For such cases we need not do anything here; the relocations will
1027 be handled correctly by relocate_section. */
1028 if (info->shared)
1029 return true;
1030
1031 /* If there are no references to this symbol that do not use the
1032 GOT, we don't need to generate a copy reloc. */
1033 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1034 return true;
1035
1036 /* We must allocate the symbol in our .dynbss section, which will
1037 become part of the .bss section of the executable. There will be
1038 an entry for this symbol in the .dynsym section. The dynamic
1039 object will contain position independent code, so all references
1040 from the dynamic object to this symbol will go through the global
1041 offset table. The dynamic linker will use the .dynsym entry to
1042 determine the address it must put in the global offset table, so
1043 both the dynamic object and the regular object will refer to the
1044 same memory location for the variable. */
1045
1046 s = bfd_get_section_by_name (dynobj, ".dynbss");
1047 BFD_ASSERT (s != NULL);
1048
1049 /* We must generate a R_390_COPY reloc to tell the dynamic linker
1050 to copy the initial value out of the dynamic object and into the
1051 runtime process image. We need to remember the offset into the
1052 .rel.bss section we are going to use. */
1053 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1054 {
1055 asection *srel;
1056
1057 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1058 BFD_ASSERT (srel != NULL);
1059 srel->_raw_size += sizeof (Elf32_External_Rela);
1060 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1061 }
1062
1063 /* We need to figure out the alignment required for this symbol. I
1064 have no idea how ELF linkers handle this. */
1065 power_of_two = bfd_log2 (h->size);
1066 if (power_of_two > 3)
1067 power_of_two = 3;
1068
1069 /* Apply the required alignment. */
1070 s->_raw_size = BFD_ALIGN (s->_raw_size,
1071 (bfd_size_type) (1 << power_of_two));
1072 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1073 {
1074 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
1075 return false;
1076 }
1077
1078 /* Define the symbol as being at this point in the section. */
1079 h->root.u.def.section = s;
1080 h->root.u.def.value = s->_raw_size;
1081
1082 /* Increment the section size to make room for the symbol. */
1083 s->_raw_size += h->size;
1084
1085 return true;
1086}
1087
1088/* Set the sizes of the dynamic sections. */
1089
1090static boolean
1091elf_s390_size_dynamic_sections (output_bfd, info)
1092 bfd *output_bfd;
1093 struct bfd_link_info *info;
1094{
1095 bfd *dynobj;
1096 asection *s;
1097 boolean reltext;
1098 boolean relocs;
1099 boolean plt;
1100
1101 dynobj = elf_hash_table (info)->dynobj;
1102 BFD_ASSERT (dynobj != NULL);
1103
1104 if (elf_hash_table (info)->dynamic_sections_created)
1105 {
1106 /* Set the contents of the .interp section to the interpreter. */
1107 if (! info->shared)
1108 {
1109 s = bfd_get_section_by_name (dynobj, ".interp");
1110 BFD_ASSERT (s != NULL);
1111 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1112 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1113 }
1114 }
1115 else
1116 {
1117 /* We may have created entries in the .rela.got section.
1118 However, if we are not creating the dynamic sections, we will
1119 not actually use these entries. Reset the size of .rela.got,
1120 which will cause it to get stripped from the output file
1121 below. */
1122 s = bfd_get_section_by_name (dynobj, ".rela.got");
1123 if (s != NULL)
1124 s->_raw_size = 0;
1125 }
1126
1127 /* If this is a -Bsymbolic shared link, then we need to discard all
1128 PC relative relocs against symbols defined in a regular object.
1129 We allocated space for them in the check_relocs routine, but we
1130 will not fill them in in the relocate_section routine. */
1131 if (info->shared)
1132 elf_s390_link_hash_traverse (elf_s390_hash_table (info),
1133 elf_s390_discard_copies,
1134 (PTR) info);
1135
1136 /* The check_relocs and adjust_dynamic_symbol entry points have
1137 determined the sizes of the various dynamic sections. Allocate
1138 memory for them. */
1139 plt = false;
1140 reltext = false;
1141 relocs = false;
1142 for (s = dynobj->sections; s != NULL; s = s->next)
1143 {
1144 const char *name;
1145 boolean strip;
1146
1147 if ((s->flags & SEC_LINKER_CREATED) == 0)
1148 continue;
1149
1150 /* It's OK to base decisions on the section name, because none
1151 of the dynobj section names depend upon the input files. */
1152 name = bfd_get_section_name (dynobj, s);
1153
1154 strip = false;
1155
1156 if (strcmp (name, ".plt") == 0)
1157 {
1158 if (s->_raw_size == 0)
1159 {
1160 /* Strip this section if we don't need it; see the
1161 comment below. */
1162 strip = true;
1163 }
1164 else
1165 {
1166 /* Remember whether there is a PLT. */
1167 plt = true;
1168 }
1169 }
1170 else if (strncmp (name, ".rela", 5) == 0)
1171 {
1172 if (s->_raw_size == 0)
1173 {
1174 /* If we don't need this section, strip it from the
1175 output file. This is to handle .rela.bss and
1176 .rel.plt. We must create it in
1177 create_dynamic_sections, because it must be created
1178 before the linker maps input sections to output
1179 sections. The linker does that before
1180 adjust_dynamic_symbol is called, and it is that
1181 function which decides whether anything needs to go
1182 into these sections. */
1183 strip = true;
1184 }
1185 else
1186 {
1187 asection *target;
1188
1189 /* Remember whether there are any reloc sections other
1190 than .rela.plt. */
1191 if (strcmp (name, ".rela.plt") != 0)
1192 {
1193 const char *outname;
1194
1195 relocs = true;
1196
1197 /* If this relocation section applies to a read only
1198 section, then we probably need a DT_TEXTREL
1199 entry. The entries in the .rela.plt section
1200 really apply to the .got section, which we
1201 created ourselves and so know is not readonly. */
1202 outname = bfd_get_section_name (output_bfd,
1203 s->output_section);
1204 target = bfd_get_section_by_name (output_bfd, outname + 5);
1205 if (target != NULL
1206 && (target->flags & SEC_READONLY) != 0
1207 && (target->flags & SEC_ALLOC) != 0)
1208 reltext = true;
1209 }
1210
1211 /* We use the reloc_count field as a counter if we need
1212 to copy relocs into the output file. */
1213 s->reloc_count = 0;
1214 }
1215 }
1216 else if (strncmp (name, ".got", 4) != 0)
1217 {
1218 /* It's not one of our sections, so don't allocate space. */
1219 continue;
1220 }
1221
1222 if (strip)
1223 {
1224 _bfd_strip_section_from_output (info, s);
1225 continue;
1226 }
1227
1228 /* Allocate memory for the section contents. */
1229 s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size);
1230 if (s->contents == NULL && s->_raw_size != 0)
1231 return false;
1232 }
1233
1234 if (elf_hash_table (info)->dynamic_sections_created)
1235 {
1236 /* Add some entries to the .dynamic section. We fill in the
1237 values later, in elf_s390_finish_dynamic_sections, but we
1238 must add the entries now so that we get the correct size for
1239 the .dynamic section. The DT_DEBUG entry is filled in by the
1240 dynamic linker and used by the debugger. */
1241 if (! info->shared)
1242 {
1243 if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
1244 return false;
1245 }
1246
1247 if (plt)
1248 {
1249 if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
1250 || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
1251 || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
1252 || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0))
1253 return false;
1254 }
1255
1256 if (relocs)
1257 {
1258 if (! bfd_elf32_add_dynamic_entry (info, DT_RELA, 0)
1259 || ! bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0)
1260 || ! bfd_elf32_add_dynamic_entry (info, DT_RELAENT,
1261 sizeof (Elf32_External_Rela)))
1262 return false;
1263 }
1264
1265 if (reltext)
1266 {
1267 if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
1268 return false;
1269 info->flags |= DF_TEXTREL;
1270 }
1271 }
1272
1273 return true;
1274}
1275
1276/* This function is called via elf_s390_link_hash_traverse if we are
1277 creating a shared object with -Bsymbolic. It discards the space
1278 allocated to copy PC relative relocs against symbols which are
1279 defined in regular objects. We allocated space for them in the
1280 check_relocs routine, but we won't fill them in in the
1281 relocate_section routine. */
1282
1283/*ARGSUSED*/
1284static boolean
1285elf_s390_discard_copies (h, inf)
1286 struct elf_s390_link_hash_entry *h;
1287 PTR inf;
1288{
1289 struct elf_s390_pcrel_relocs_copied *s;
1290 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1291
1292 /* If a symbol has been forced local or we have found a regular
1293 definition for the symbolic link case, then we won't be needing
1294 any relocs. */
1295 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1296 && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
1297 || info->symbolic))
1298 {
1299 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1300 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1301 }
1302 return true;
1303}
1304/* Relocate a 390 ELF section. */
1305
1306static boolean
1307elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
1308 contents, relocs, local_syms, local_sections)
1309 bfd *output_bfd;
1310 struct bfd_link_info *info;
1311 bfd *input_bfd;
1312 asection *input_section;
1313 bfd_byte *contents;
1314 Elf_Internal_Rela *relocs;
1315 Elf_Internal_Sym *local_syms;
1316 asection **local_sections;
1317{
1318 bfd *dynobj;
1319 Elf_Internal_Shdr *symtab_hdr;
1320 struct elf_link_hash_entry **sym_hashes;
1321 bfd_vma *local_got_offsets;
1322 asection *sgot;
1323 asection *splt;
1324 asection *sreloc;
1325 Elf_Internal_Rela *rel;
1326 Elf_Internal_Rela *relend;
1327
1328 dynobj = elf_hash_table (info)->dynobj;
1329 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1330 sym_hashes = elf_sym_hashes (input_bfd);
1331 local_got_offsets = elf_local_got_offsets (input_bfd);
1332
1333 sgot = NULL;
1334 splt = NULL;
1335 sreloc = NULL;
1336 if (dynobj != NULL)
1337 {
1338 splt = bfd_get_section_by_name (dynobj, ".plt");
1339 sgot = bfd_get_section_by_name (dynobj, ".got");
1340 }
1341
1342 rel = relocs;
1343 relend = relocs + input_section->reloc_count;
1344 for (; rel < relend; rel++)
1345 {
1346 int r_type;
1347 reloc_howto_type *howto;
1348 unsigned long r_symndx;
1349 struct elf_link_hash_entry *h;
1350 Elf_Internal_Sym *sym;
1351 asection *sec;
1352 bfd_vma relocation;
1353 bfd_reloc_status_type r;
1354
1355 r_type = ELF32_R_TYPE (rel->r_info);
1356 if (r_type == (int) R_390_GNU_VTINHERIT
1357 || r_type == (int) R_390_GNU_VTENTRY)
1358 continue;
1359 if (r_type < 0 || r_type >= (int) R_390_max)
1360 {
1361 bfd_set_error (bfd_error_bad_value);
1362 return false;
1363 }
1364 howto = elf_howto_table + r_type;
1365
1366 r_symndx = ELF32_R_SYM (rel->r_info);
1367
1368 if (info->relocateable)
1369 {
1370 /* This is a relocateable link. We don't have to change
1371 anything, unless the reloc is against a section symbol,
1372 in which case we have to adjust according to where the
1373 section symbol winds up in the output section. */
1374 if (r_symndx < symtab_hdr->sh_info)
1375 {
1376 sym = local_syms + r_symndx;
1377 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1378 {
1379 sec = local_sections[r_symndx];
1380 rel->r_addend += sec->output_offset + sym->st_value;
1381 }
1382 }
1383
1384 continue;
1385 }
1386
1387 /* This is a final link. */
1388 h = NULL;
1389 sym = NULL;
1390 sec = NULL;
1391 if (r_symndx < symtab_hdr->sh_info)
1392 {
1393 sym = local_syms + r_symndx;
1394 sec = local_sections[r_symndx];
1395 relocation = (sec->output_section->vma
1396 + sec->output_offset
1397 + sym->st_value);
1398 }
1399 else
1400 {
1401 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1402 while (h->root.type == bfd_link_hash_indirect
1403 || h->root.type == bfd_link_hash_warning)
1404 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1405 if (h->root.type == bfd_link_hash_defined
1406 || h->root.type == bfd_link_hash_defweak)
1407 {
1408 sec = h->root.u.def.section;
1409 if (r_type == R_390_GOTPC
1410 || ((r_type == R_390_PLT16DBL ||
1411 r_type == R_390_PLT32)
1412 && splt != NULL
1413 && h->plt.offset != (bfd_vma) -1)
1414 || ((r_type == R_390_GOT12 ||
1415 r_type == R_390_GOT16 ||
1416 r_type == R_390_GOT32)
1417 && elf_hash_table (info)->dynamic_sections_created
1418 && (! info->shared
1419 || (! info->symbolic && h->dynindx != -1)
1420 || (h->elf_link_hash_flags
1421 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1422 || (info->shared
1423 && ((! info->symbolic && h->dynindx != -1)
1424 || (h->elf_link_hash_flags
1425 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1426 && ( r_type == R_390_8 ||
1427 r_type == R_390_16 ||
1428 r_type == R_390_32 ||
1429 r_type == R_390_PC16 ||
1430 r_type == R_390_PC16DBL ||
1431 r_type == R_390_PC32)
1432 && ((input_section->flags & SEC_ALLOC) != 0
1433 /* DWARF will emit R_386_32 relocations in its
1434 sections against symbols defined externally
1435 in shared libraries. We can't do anything
1436 with them here. */
1437 || ((input_section->flags & SEC_DEBUGGING) != 0
1438 && (h->elf_link_hash_flags
1439 & ELF_LINK_HASH_DEF_DYNAMIC) != 0))))
1440 {
1441 /* In these cases, we don't need the relocation
1442 value. We check specially because in some
1443 obscure cases sec->output_section will be NULL. */
1444 relocation = 0;
1445 }
1446 else if (sec->output_section == NULL)
1447 {
1448 (*_bfd_error_handler)
1449 (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
1450 bfd_get_filename (input_bfd), h->root.root.string,
1451 bfd_get_section_name (input_bfd, input_section));
1452 relocation = 0;
1453 }
1454 else
1455 relocation = (h->root.u.def.value
1456 + sec->output_section->vma
1457 + sec->output_offset);
1458 }
1459 else if (h->root.type == bfd_link_hash_undefweak)
1460 relocation = 0;
1461 else if (info->shared && !info->symbolic
1462 && !info->no_undefined
1463 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1464 relocation = 0;
1465 else
1466 {
1467 if (! ((*info->callbacks->undefined_symbol)
1468 (info, h->root.root.string, input_bfd,
1469 input_section, rel->r_offset,
1470 (!info->shared || info->no_undefined
1471 || ELF_ST_VISIBILITY (h->other)))))
1472 return false;
1473 relocation = 0;
1474 }
1475 }
1476
1477 switch (r_type)
1478 {
1479 case R_390_GOT12:
1480 case R_390_GOT16:
1481 case R_390_GOT32:
1482 /* Relocation is to the entry for this symbol in the global
1483 offset table. */
1484 BFD_ASSERT (sgot != NULL);
1485
1486 if (h != NULL)
1487 {
1488 bfd_vma off;
1489
1490 off = h->got.offset;
1491 BFD_ASSERT (off != (bfd_vma) -1);
1492
1493 if (! elf_hash_table (info)->dynamic_sections_created
1494 || (info->shared
1495 && (info->symbolic || h->dynindx == -1)
1496 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1497 {
1498 /* This is actually a static link, or it is a
1499 -Bsymbolic link and the symbol is defined
1500 locally, or the symbol was forced to be local
1501 because of a version file. We must initialize
1502 this entry in the global offset table. Since the
1503 offset must always be a multiple of 2, we use the
1504 least significant bit to record whether we have
1505 initialized it already.
1506
1507 When doing a dynamic link, we create a .rel.got
1508 relocation entry to initialize the value. This
1509 is done in the finish_dynamic_symbol routine. */
1510 if ((off & 1) != 0)
1511 off &= ~1;
1512 else
1513 {
1514 bfd_put_32 (output_bfd, relocation,
1515 sgot->contents + off);
1516 h->got.offset |= 1;
1517 }
1518 }
1519 relocation = sgot->output_offset + off;
1520 }
1521 else
1522 {
1523 bfd_vma off;
1524
1525 BFD_ASSERT (local_got_offsets != NULL
1526 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1527
1528 off = local_got_offsets[r_symndx];
1529
1530 /* The offset must always be a multiple of 4. We use
1531 the least significant bit to record whether we have
1532 already generated the necessary reloc. */
1533 if ((off & 1) != 0)
1534 off &= ~1;
1535 else
1536 {
1537 bfd_put_32 (output_bfd, relocation, sgot->contents + off);
1538
1539 if (info->shared)
1540 {
1541 asection *srelgot;
1542 Elf_Internal_Rela outrel;
1543
1544 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1545 BFD_ASSERT (srelgot != NULL);
1546
1547 outrel.r_offset = (sgot->output_section->vma
1548 + sgot->output_offset
1549 + off);
1550 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
1551 outrel.r_addend = relocation;
1552 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1553 (((Elf32_External_Rela *)
1554 srelgot->contents)
1555 + srelgot->reloc_count));
1556 ++srelgot->reloc_count;
1557 }
1558
1559 local_got_offsets[r_symndx] |= 1;
1560 }
1561
1562 relocation = sgot->output_offset + off;
1563 }
1564
1565
1566 break;
1567
1568 case R_390_GOTOFF:
1569 /* Relocation is relative to the start of the global offset
1570 table. */
1571
1572 if (sgot == NULL)
1573 {
1574 sgot = bfd_get_section_by_name (dynobj, ".got");
1575 BFD_ASSERT (sgot != NULL);
1576 }
1577
1578 /* Note that sgot->output_offset is not involved in this
1579 calculation. We always want the start of .got. If we
1580 defined _GLOBAL_OFFSET_TABLE in a different way, as is
1581 permitted by the ABI, we might have to change this
1582 calculation. */
1583 relocation -= sgot->output_section->vma;
1584
1585 break;
1586
1587 case R_390_GOTPC:
1588 /* Use global offset table as symbol value. */
1589
1590 if (sgot == NULL)
1591 {
1592 sgot = bfd_get_section_by_name (dynobj, ".got");
1593 BFD_ASSERT (sgot != NULL);
1594 }
1595
1596 relocation = sgot->output_section->vma;
1597
1598 break;
1599
1600 case R_390_PLT16DBL:
1601 case R_390_PLT32:
1602 /* Relocation is to the entry for this symbol in the
1603 procedure linkage table. */
1604
1605 /* Resolve a PLT32 reloc against a local symbol directly,
1606 without using the procedure linkage table. */
1607 if (h == NULL)
1608 break;
1609
1610 if (h->plt.offset == (bfd_vma) -1 || splt == NULL)
1611 {
1612 /* We didn't make a PLT entry for this symbol. This
1613 happens when statically linking PIC code, or when
1614 using -Bsymbolic. */
1615 break;
1616 }
1617
1618 relocation = (splt->output_section->vma
1619 + splt->output_offset
1620 + h->plt.offset);
1621
1622 break;
1623
1624 case R_390_8:
1625 case R_390_16:
1626 case R_390_32:
1627 case R_390_PC16:
1628 case R_390_PC16DBL:
1629 case R_390_PC32:
1630 if (info->shared
1631 && (input_section->flags & SEC_ALLOC) != 0
1632 && ((r_type != R_390_PC16 &&
1633 r_type != R_390_PC16DBL &&
1634 r_type != R_390_PC32)
1635 || (h != NULL
1636 && h->dynindx != -1
1637 && (! info->symbolic
1638 || (h->elf_link_hash_flags
1639 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1640 {
1641 Elf_Internal_Rela outrel;
1642 boolean skip, relocate;
1643
1644 /* When generating a shared object, these relocations
1645 are copied into the output file to be resolved at run
1646 time. */
1647
1648 if (sreloc == NULL)
1649 {
1650 const char *name;
1651
1652 name = (bfd_elf_string_from_elf_section
1653 (input_bfd,
1654 elf_elfheader (input_bfd)->e_shstrndx,
1655 elf_section_data (input_section)->rel_hdr.sh_name));
1656 if (name == NULL)
1657 return false;
1658
1659 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1660 && strcmp (bfd_get_section_name (input_bfd,
1661 input_section),
1662 name + 5) == 0);
1663
1664 sreloc = bfd_get_section_by_name (dynobj, name);
1665 BFD_ASSERT (sreloc != NULL);
1666 }
1667
1668 skip = false;
1669
1670 if (elf_section_data (input_section)->stab_info == NULL)
1671 outrel.r_offset = rel->r_offset;
1672 else
1673 {
1674 bfd_vma off;
1675
1676 off = (_bfd_stab_section_offset
1677 (output_bfd, &elf_hash_table (info)->stab_info,
1678 input_section,
1679 &elf_section_data (input_section)->stab_info,
1680 rel->r_offset));
1681 if (off == (bfd_vma) -1)
1682 skip = true;
1683 outrel.r_offset = off;
1684 }
1685
1686 outrel.r_offset += (input_section->output_section->vma
1687 + input_section->output_offset);
1688
1689 if (skip)
1690 {
1691 memset (&outrel, 0, sizeof outrel);
1692 relocate = false;
1693 }
1694 else if (r_type == R_390_PC16 ||
1695 r_type == R_390_PC16DBL ||
1696 r_type == R_390_PC32)
1697 {
1698 BFD_ASSERT (h != NULL && h->dynindx != -1);
1699 relocate = false;
1700 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1701 outrel.r_addend = relocation + rel->r_addend;
1702 }
1703 else
1704 {
1705 /* h->dynindx may be -1 if this symbol was marked to
1706 become local. */
1707 if (h == NULL
1708 || ((info->symbolic || h->dynindx == -1)
1709 && (h->elf_link_hash_flags
1710 & ELF_LINK_HASH_DEF_REGULAR) != 0))
1711 {
1712 relocate = true;
1713 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
1714 outrel.r_addend = relocation + rel->r_addend;
1715 }
1716 else
1717 {
1718 BFD_ASSERT (h->dynindx != -1);
1719 relocate = false;
1720 outrel.r_info = ELF32_R_INFO (h->dynindx, R_390_32);
1721 outrel.r_addend = relocation + rel->r_addend;
1722 }
1723 }
1724
1725 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1726 (((Elf32_External_Rela *)
1727 sreloc->contents)
1728 + sreloc->reloc_count));
1729 ++sreloc->reloc_count;
1730
1731 /* If this reloc is against an external symbol, we do
1732 not want to fiddle with the addend. Otherwise, we
1733 need to include the symbol value so that it becomes
1734 an addend for the dynamic reloc. */
1735 if (! relocate)
1736 continue;
1737 }
1738
1739 break;
1740
1741 default:
1742 break;
1743 }
1744
1745 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1746 contents, rel->r_offset,
1747 relocation, rel->r_addend);
1748
1749 if (r != bfd_reloc_ok)
1750 {
1751 switch (r)
1752 {
1753 default:
1754 case bfd_reloc_outofrange:
1755 abort ();
1756 case bfd_reloc_overflow:
1757 {
1758 const char *name;
1759
1760 if (h != NULL)
1761 name = h->root.root.string;
1762 else
1763 {
1764 name = bfd_elf_string_from_elf_section (input_bfd,
1765 symtab_hdr->sh_link,
1766 sym->st_name);
1767 if (name == NULL)
1768 return false;
1769 if (*name == '\0')
1770 name = bfd_section_name (input_bfd, sec);
1771 }
1772 if (! ((*info->callbacks->reloc_overflow)
1773 (info, name, howto->name, (bfd_vma) 0,
1774 input_bfd, input_section, rel->r_offset)))
1775 return false;
1776 }
1777 break;
1778 }
1779 }
1780 }
1781
1782 return true;
1783}
1784
1785/* Finish up dynamic symbol handling. We set the contents of various
1786 dynamic sections here. */
1787
1788static boolean
1789elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
1790 bfd *output_bfd;
1791 struct bfd_link_info *info;
1792 struct elf_link_hash_entry *h;
1793 Elf_Internal_Sym *sym;
1794{
1795 bfd *dynobj;
1796
1797 dynobj = elf_hash_table (info)->dynobj;
1798
1799 if (h->plt.offset != (bfd_vma) -1)
1800 {
1801 asection *splt;
1802 asection *srela;
1803 Elf_Internal_Rela rela;
1804 bfd_vma relative_offset;
1805 bfd_vma got_offset;
1806 bfd_vma plt_index;
1807 asection *sgot;
1808
1809 /* This symbol has an entry in the procedure linkage table. Set
1810 it up. */
1811
1812 BFD_ASSERT (h->dynindx != -1);
1813
1814 splt = bfd_get_section_by_name (dynobj, ".plt");
1815 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1816 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1817 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1818
1819 /* Calc. index no.
1820 Current offset - size first entry / entry size. */
1821 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
1822
1823 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
1824 addr & GOT addr. */
1825 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
1826
1827 /* S390 uses halfwords for relative branch calc! */
1828 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
1829 (PLT_ENTRY_SIZE * plt_index) + 18)/2);
1830 /* If offset is > 32768, branch to a previous branch
1831 390 can only handle +-64 K jumps. */
1832 if ( -32768 > (int)relative_offset )
1833 relative_offset = -(((65536/PLT_ENTRY_SIZE-1)*PLT_ENTRY_SIZE)/2);
1834
1835 /* Fill in the entry in the procedure linkage table. */
1836 if (!info->shared)
1837 {
1838 bfd_put_32 (output_bfd, PLT_ENTRY_WORD0,
1839 splt->contents + h->plt.offset);
1840 bfd_put_32 (output_bfd, PLT_ENTRY_WORD1,
1841 splt->contents + h->plt.offset + 4);
1842 bfd_put_32 (output_bfd, PLT_ENTRY_WORD2,
1843 splt->contents + h->plt.offset + 8);
1844 bfd_put_32 (output_bfd, PLT_ENTRY_WORD3,
1845 splt->contents + h->plt.offset + 12);
1846 bfd_put_32 (output_bfd, PLT_ENTRY_WORD4,
1847 splt->contents + h->plt.offset + 16);
1848 bfd_put_32 (output_bfd, 0+(relative_offset << 16),
1849 splt->contents + h->plt.offset + 20);
1850 bfd_put_32 (output_bfd,
1851 (sgot->output_section->vma +
1852 sgot->output_offset +
1853 got_offset),
1854 splt->contents + h->plt.offset + 24);
1855 }
1856 else if (got_offset < 4096)
1857 {
1858 bfd_put_32 (output_bfd, PLT_PIC12_ENTRY_WORD0 + got_offset,
1859 splt->contents + h->plt.offset);
1860 bfd_put_32 (output_bfd, PLT_PIC12_ENTRY_WORD1,
1861 splt->contents + h->plt.offset + 4);
1862 bfd_put_32 (output_bfd, PLT_PIC12_ENTRY_WORD2,
1863 splt->contents + h->plt.offset + 8);
1864 bfd_put_32 (output_bfd, PLT_PIC12_ENTRY_WORD3,
1865 splt->contents + h->plt.offset + 12);
1866 bfd_put_32 (output_bfd, PLT_PIC12_ENTRY_WORD4,
1867 splt->contents + h->plt.offset + 16);
1868 bfd_put_32 (output_bfd, 0+(relative_offset << 16),
1869 splt->contents + h->plt.offset + 20);
1870 bfd_put_32 (output_bfd, 0,
1871 splt->contents + h->plt.offset + 24);
1872 }
1873 else if (got_offset < 32768)
1874 {
1875 bfd_put_32 (output_bfd, PLT_PIC16_ENTRY_WORD0 + got_offset,
1876 splt->contents + h->plt.offset);
1877 bfd_put_32 (output_bfd, PLT_PIC16_ENTRY_WORD1,
1878 splt->contents + h->plt.offset + 4);
1879 bfd_put_32 (output_bfd, PLT_PIC16_ENTRY_WORD2,
1880 splt->contents + h->plt.offset + 8);
1881 bfd_put_32 (output_bfd, PLT_PIC16_ENTRY_WORD3,
1882 splt->contents + h->plt.offset + 12);
1883 bfd_put_32 (output_bfd, PLT_PIC16_ENTRY_WORD4,
1884 splt->contents + h->plt.offset + 16);
1885 bfd_put_32 (output_bfd, 0+(relative_offset << 16),
1886 splt->contents + h->plt.offset + 20);
1887 bfd_put_32 (output_bfd, 0,
1888 splt->contents + h->plt.offset + 24);
1889 }
1890 else
1891 {
1892 bfd_put_32 (output_bfd, PLT_PIC_ENTRY_WORD0,
1893 splt->contents + h->plt.offset);
1894 bfd_put_32 (output_bfd, PLT_PIC_ENTRY_WORD1,
1895 splt->contents + h->plt.offset + 4);
1896 bfd_put_32 (output_bfd, PLT_PIC_ENTRY_WORD2,
1897 splt->contents + h->plt.offset + 8);
1898 bfd_put_32 (output_bfd, PLT_PIC_ENTRY_WORD3,
1899 splt->contents + h->plt.offset + 12);
1900 bfd_put_32 (output_bfd, PLT_PIC_ENTRY_WORD4,
1901 splt->contents + h->plt.offset + 16);
1902 bfd_put_32 (output_bfd, 0+(relative_offset << 16),
1903 splt->contents + h->plt.offset + 20);
1904 bfd_put_32 (output_bfd, got_offset,
1905 splt->contents + h->plt.offset + 24);
1906 }
1907 /* Insert offset into reloc. table here. */
1908 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1909 splt->contents + h->plt.offset + 28);
1910 /* Fill in the entry in the .rela.plt section. */
1911 rela.r_offset = (sgot->output_section->vma
1912 + sgot->output_offset
1913 + got_offset);
1914 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
1915 rela.r_addend = 0;
1916 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1917 ((Elf32_External_Rela *) srela->contents
1918 + plt_index ));
1919
1920 /* Fill in the entry in the global offset table.
1921 Points to instruction after GOT offset. */
1922 bfd_put_32 (output_bfd,
1923 (splt->output_section->vma
1924 + splt->output_offset
1925 + h->plt.offset
1926 + 12),
1927 sgot->contents + got_offset);
1928
1929
1930 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1931 {
1932 /* Mark the symbol as undefined, rather than as defined in
1933 the .plt section. Leave the value alone. */
1934 sym->st_shndx = SHN_UNDEF;
1935 }
1936 }
1937
1938 if (h->got.offset != (bfd_vma) -1)
1939 {
1940 asection *sgot;
1941 asection *srela;
1942 Elf_Internal_Rela rela;
1943
1944 /* This symbol has an entry in the global offset table. Set it
1945 up. */
1946
1947 sgot = bfd_get_section_by_name (dynobj, ".got");
1948 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1949 BFD_ASSERT (sgot != NULL && srela != NULL);
1950
1951 rela.r_offset = (sgot->output_section->vma
1952 + sgot->output_offset
1953 + (h->got.offset &~ 1));
1954
1955 /* If this is a static link, or it is a -Bsymbolic link and the
1956 symbol is defined locally or was forced to be local because
1957 of a version file, we just want to emit a RELATIVE reloc.
1958 The entry in the global offset table will already have been
1959 initialized in the relocate_section function. */
1960 if (! elf_hash_table (info)->dynamic_sections_created
1961 || (info->shared
1962 && (info->symbolic || h->dynindx == -1)
1963 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1964 {
1965 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
1966 rela.r_addend = (h->root.u.def.value
1967 + h->root.u.def.section->output_section->vma
1968 + h->root.u.def.section->output_offset);
1969 }
1970 else
1971 {
1972 BFD_ASSERT((h->got.offset & 1) == 0);
1973 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
1974 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
1975 rela.r_addend = 0;
1976 }
1977
1978 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1979 ((Elf32_External_Rela *) srela->contents
1980 + srela->reloc_count));
1981 ++srela->reloc_count;
1982 }
1983
1984 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1985 {
1986 asection *s;
1987 Elf_Internal_Rela rela;
1988
1989 /* This symbols needs a copy reloc. Set it up. */
1990
1991 BFD_ASSERT (h->dynindx != -1
1992 && (h->root.type == bfd_link_hash_defined
1993 || h->root.type == bfd_link_hash_defweak));
1994
1995
1996 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1997 ".rela.bss");
1998 BFD_ASSERT (s != NULL);
1999
2000 rela.r_offset = (h->root.u.def.value
2001 + h->root.u.def.section->output_section->vma
2002 + h->root.u.def.section->output_offset);
2003 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
2004 rela.r_addend = 0;
2005 bfd_elf32_swap_reloca_out (output_bfd, &rela,
2006 ((Elf32_External_Rela *) s->contents
2007 + s->reloc_count));
2008 ++s->reloc_count;
2009 }
2010
2011 /* Mark some specially defined symbols as absolute. */
2012 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2013 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
2014 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
2015 sym->st_shndx = SHN_ABS;
2016
2017 return true;
2018}
2019
2020/* Finish up the dynamic sections. */
2021
2022static boolean
2023elf_s390_finish_dynamic_sections (output_bfd, info)
2024 bfd *output_bfd;
2025 struct bfd_link_info *info;
2026{
2027 bfd *dynobj;
2028 asection *sdyn;
2029 asection *sgot;
2030
2031 dynobj = elf_hash_table (info)->dynobj;
2032
2033 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2034 BFD_ASSERT (sgot != NULL);
2035 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2036
2037 if (elf_hash_table (info)->dynamic_sections_created)
2038 {
2039 asection *splt;
2040 Elf32_External_Dyn *dyncon, *dynconend;
2041
2042 BFD_ASSERT (sdyn != NULL);
2043
2044 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2045 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2046 for (; dyncon < dynconend; dyncon++)
2047 {
2048 Elf_Internal_Dyn dyn;
2049 const char *name;
2050 asection *s;
2051
2052 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2053
2054 switch (dyn.d_tag)
2055 {
2056 default:
2057 break;
2058
2059 case DT_PLTGOT:
2060 name = ".got";
2061 goto get_vma;
2062 case DT_JMPREL:
2063 name = ".rela.plt";
2064 get_vma:
2065 s = bfd_get_section_by_name(output_bfd, name);
2066 BFD_ASSERT (s != NULL);
2067 dyn.d_un.d_ptr = s->vma;
2068 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2069 break;
2070
2071 case DT_PLTRELSZ:
2072 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2073 BFD_ASSERT (s != NULL);
2074 if (s->_cooked_size != 0)
2075 dyn.d_un.d_val = s->_cooked_size;
2076 else
2077 dyn.d_un.d_val = s->_raw_size;
2078 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2079 break;
2080 }
2081 }
2082
2083 /* Fill in the special first entry in the procedure linkage table. */
2084 splt = bfd_get_section_by_name (dynobj, ".plt");
2085 if (splt && splt->_raw_size > 0)
2086 {
2087 memset (splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
2088 if (info->shared)
2089 {
2090 bfd_put_32 (output_bfd, PLT_PIC_FIRST_ENTRY_WORD0,
2091 splt->contents );
2092 bfd_put_32 (output_bfd, PLT_PIC_FIRST_ENTRY_WORD1,
2093 splt->contents +4 );
2094 bfd_put_32 (output_bfd, PLT_PIC_FIRST_ENTRY_WORD2,
2095 splt->contents +8 );
2096 bfd_put_32 (output_bfd, PLT_PIC_FIRST_ENTRY_WORD3,
2097 splt->contents +12 );
2098 bfd_put_32 (output_bfd, PLT_PIC_FIRST_ENTRY_WORD4,
2099 splt->contents +16 );
2100 }
2101 else
2102 {
2103 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD0,
2104 splt->contents );
2105 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD1,
2106 splt->contents +4 );
2107 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD2,
2108 splt->contents +8 );
2109 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD3,
2110 splt->contents +12 );
2111 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD4,
2112 splt->contents +16 );
2113 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD5,
2114 splt->contents +20 );
2115 bfd_put_32 (output_bfd,
2116 sgot->output_section->vma + sgot->output_offset,
2117 splt->contents + 24);
2118 }
2119 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4;
2120 }
2121
2122 }
2123
2124 /* Set the first entry in the global offset table to the address of
2125 the dynamic section. */
2126 if (sgot->_raw_size > 0)
2127 {
2128 if (sdyn == NULL)
2129 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2130 else
2131 bfd_put_32 (output_bfd,
2132 sdyn->output_section->vma + sdyn->output_offset,
2133 sgot->contents);
2134
2135 /* One entry for shared object struct ptr. */
2136 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2137 /* One entry for _dl_runtime_resolve. */
2138 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2139 }
2140
2141 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2142
2143 return true;
2144}
2145
2146static boolean
2147elf_s390_object_p (abfd)
2148 bfd *abfd;
2149{
2150 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_esa);
2151}
2152
2153#define TARGET_BIG_SYM bfd_elf32_s390_vec
2154#define TARGET_BIG_NAME "elf32-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_can_gc_sections 1
2161#define elf_backend_want_got_plt 1
2162#define elf_backend_plt_readonly 1
2163#define elf_backend_want_plt_sym 0
2164#define elf_backend_got_header_size 12
2165#define elf_backend_plt_header_size PLT_ENTRY_SIZE
2166
2167#define elf_info_to_howto elf_s390_info_to_howto
2168
2169#define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2170#define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
2171#define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
2172#define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
2173
2174#define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
2175#define elf_backend_check_relocs elf_s390_check_relocs
2176#define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
2177#define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
2178#define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
2179#define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
2180#define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
2181#define elf_backend_relocate_section elf_s390_relocate_section
2182#define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
2183
2184#define elf_backend_object_p elf_s390_object_p
2185
2186#include "elf32-target.h"
GDB Binutils - Deliverables
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