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[deliverable/binutils-gdb.git] / bfd / elf32-s390.c
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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 *));
f51e552e
AM		 59static enum elf_reloc_type_class elf_s390_reloc_type_class
60 PARAMS ((const Elf_Internal_Rela *));
a85d7ed0
NC		 61
62#define USE_RELA 1 /* We want RELA relocations, not REL. */
63
64#include "elf/s390.h"
65
66/* The relocation "howto" table. */
67
68static reloc_howto_type elf_howto_table[] =
69{
70 HOWTO (R_390_NONE, /* type */
71 0, /* rightshift */
72 0, /* size (0 = byte, 1 = short, 2 = long) */
73 0, /* bitsize */
74 false, /* pc_relative */
75 0, /* bitpos */
76 complain_overflow_dont, /* complain_on_overflow */
77 bfd_elf_generic_reloc, /* special_function */
78 "R_390_NONE", /* name */
79 false, /* partial_inplace */
80 0, /* src_mask */
81 0, /* dst_mask */
82 false), /* pcrel_offset */
83
84 HOWTO(R_390_8, 0, 0, 8, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false),
85 HOWTO(R_390_12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false),
86 HOWTO(R_390_16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false),
87 HOWTO(R_390_32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false),
88 HOWTO(R_390_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true),
89 HOWTO(R_390_GOT12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false),
90 HOWTO(R_390_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false),
91 HOWTO(R_390_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true),
92 HOWTO(R_390_COPY, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_COPY", false, 0,0xffffffff, false),
93 HOWTO(R_390_GLOB_DAT, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GLOB_DAT",false, 0,0xffffffff, false),
94 HOWTO(R_390_JMP_SLOT, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_JMP_SLOT",false, 0,0xffffffff, false),
95 HOWTO(R_390_RELATIVE, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_RELATIVE",false, 0,0xffffffff, false),
96 HOWTO(R_390_GOTOFF, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTOFF", false, 0,0xffffffff, false),
97 HOWTO(R_390_GOTPC, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,0xffffffff, true),
98 HOWTO(R_390_GOT16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false),
99 HOWTO(R_390_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true),
100 HOWTO(R_390_PC16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true),
101 HOWTO(R_390_PLT16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true),
102};
103
104/* GNU extension to record C++ vtable hierarchy. */
105static reloc_howto_type elf32_s390_vtinherit_howto =
106 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false);
107static reloc_howto_type elf32_s390_vtentry_howto =
dc810e39 108 HOWTO (R_390_GNU_VTENTRY, 0,2,0,false,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", false,0,0, false);
a85d7ed0
NC		 109
110static reloc_howto_type *
111elf_s390_reloc_type_lookup (abfd, code)
112 bfd *abfd ATTRIBUTE_UNUSED;
113 bfd_reloc_code_real_type code;
114{
115 switch (code) {
116 case BFD_RELOC_NONE:
117 return &elf_howto_table[(int) R_390_NONE];
118 case BFD_RELOC_8:
119 return &elf_howto_table[(int) R_390_8];
120 case BFD_RELOC_390_12:
121 return &elf_howto_table[(int) R_390_12];
122 case BFD_RELOC_16:
123 return &elf_howto_table[(int) R_390_16];
124 case BFD_RELOC_32:
125 return &elf_howto_table[(int) R_390_32];
126 case BFD_RELOC_CTOR:
127 return &elf_howto_table[(int) R_390_32];
128 case BFD_RELOC_32_PCREL:
129 return &elf_howto_table[(int) R_390_PC32];
130 case BFD_RELOC_390_GOT12:
131 return &elf_howto_table[(int) R_390_GOT12];
132 case BFD_RELOC_32_GOT_PCREL:
133 return &elf_howto_table[(int) R_390_GOT32];
134 case BFD_RELOC_390_PLT32:
135 return &elf_howto_table[(int) R_390_PLT32];
136 case BFD_RELOC_390_COPY:
137 return &elf_howto_table[(int) R_390_COPY];
138 case BFD_RELOC_390_GLOB_DAT:
139 return &elf_howto_table[(int) R_390_GLOB_DAT];
140 case BFD_RELOC_390_JMP_SLOT:
141 return &elf_howto_table[(int) R_390_JMP_SLOT];
142 case BFD_RELOC_390_RELATIVE:
143 return &elf_howto_table[(int) R_390_RELATIVE];
144 case BFD_RELOC_32_GOTOFF:
145 return &elf_howto_table[(int) R_390_GOTOFF];
146 case BFD_RELOC_390_GOTPC:
147 return &elf_howto_table[(int) R_390_GOTPC];
148 case BFD_RELOC_390_GOT16:
149 return &elf_howto_table[(int) R_390_GOT16];
150 case BFD_RELOC_16_PCREL:
151 return &elf_howto_table[(int) R_390_PC16];
152 case BFD_RELOC_390_PC16DBL:
153 return &elf_howto_table[(int) R_390_PC16DBL];
154 case BFD_RELOC_390_PLT16DBL:
155 return &elf_howto_table[(int) R_390_PLT16DBL];
156 case BFD_RELOC_VTABLE_INHERIT:
157 return &elf32_s390_vtinherit_howto;
158 case BFD_RELOC_VTABLE_ENTRY:
159 return &elf32_s390_vtentry_howto;
160 default:
dc810e39 161 break;
a85d7ed0
NC		 162 }
163 return 0;
164}
165
166/* We need to use ELF32_R_TYPE so we have our own copy of this function,
167 and elf32-s390.c has its own copy. */
168
169static void
170elf_s390_info_to_howto (abfd, cache_ptr, dst)
171 bfd *abfd ATTRIBUTE_UNUSED;
172 arelent *cache_ptr;
173 Elf_Internal_Rela *dst;
174{
175 switch (ELF32_R_TYPE(dst->r_info))
176 {
177 case R_390_GNU_VTINHERIT:
178 cache_ptr->howto = &elf32_s390_vtinherit_howto;
179 break;
180
181 case R_390_GNU_VTENTRY:
182 cache_ptr->howto = &elf32_s390_vtentry_howto;
183 break;
184
185 default:
186 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_390_max);
187 cache_ptr->howto = &elf_howto_table[ELF32_R_TYPE(dst->r_info)];
dc810e39 188 }
a85d7ed0
NC		 189}
190
191static boolean
192elf_s390_is_local_label_name (abfd, name)
193 bfd *abfd;
194 const char *name;
195{
196 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
197 return true;
198
199 return _bfd_elf_is_local_label_name (abfd, name);
200}
201
202/* Functions for the 390 ELF linker. */
203
204/* The name of the dynamic interpreter. This is put in the .interp
205 section. */
206
207#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
208
209/* The nop opcode we use. */
210
211#define s390_NOP 0x07070707
212
213
214/* The size in bytes of the first entry in the procedure linkage table. */
215#define PLT_FIRST_ENTRY_SIZE 32
216/* The size in bytes of an entry in the procedure linkage table. */
dc810e39 217#define PLT_ENTRY_SIZE 32
a85d7ed0
NC		 218
219#define GOT_ENTRY_SIZE 4
220
221/* The first three entries in a procedure linkage table are reserved,
222 and the initial contents are unimportant (we zero them out).
223 Subsequent entries look like this. See the SVR4 ABI 386
224 supplement to see how this works. */
225
226/* For the s390, simple addr offset can only be 0 - 4096.
227 To use the full 2 GB address space, several instructions
228 are needed to load an address in a register and execute
229 a branch( or just saving the address)
230
dc810e39 231 Furthermore, only r 0 and 1 are free to use!!! */
a85d7ed0
NC		 232
233/* The first 3 words in the GOT are then reserved.
234 Word 0 is the address of the dynamic table.
235 Word 1 is a pointer to a structure describing the object
236 Word 2 is used to point to the loader entry address.
237
238 The code for position independand PLT entries looks like this:
239
240 r12 holds addr of the current GOT at entry to the PLT
241
242 The GOT holds the address in the PLT to be executed.
243 The loader then gets:
244 24(15) = Pointer to the structure describing the object.
dc810e39 245 28(15) = Offset in symbol table
a85d7ed0
NC		 246
247 The loader must then find the module where the function is
248 and insert the address in the GOT.
249
250 Note: 390 can only address +- 64 K relative.
251 We check if offset > 65536, then make a relative branch -64xxx
252 back to a previous defined branch
253
254PLT1: BASR 1,0 # 2 bytes
255 L 1,22(1) # 4 bytes Load offset in GOT in r 1
256 L 1,(1,12) # 4 bytes Load address from GOT in r1
257 BCR 15,1 # 2 bytes Jump to address
258RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
259 L 1,14(1) # 4 bytes Load offset in symol table in r1
260 BRC 15,-x # 4 bytes Jump to start of PLT
261 .word 0 # 2 bytes filler
262 .long ? # 4 bytes offset in GOT
263 .long ? # 4 bytes offset into symbol table
264
265 This was the general case. There are two additional, optimizes PLT
266 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768.
267 First the one for GOT offsets < 4096:
268
269PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1
270 BCR 15,1 # 2 bytes Jump to address
271 .word 0,0,0 # 6 bytes filler
272RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
273 L 1,14(1) # 4 bytes Load offset in symbol table in r1
274 BRC 15,-x # 4 bytes Jump to start of PLT
275 .word 0,0,0 # 6 bytes filler
276 .long ? # 4 bytes offset into symbol table
277
278 Second the one for GOT offsets < 32768:
279
280PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1
281 L 1,(1,12) # 4 bytes Load address from GOT to r1
282 BCR 15,1 # 2 bytes Jump to address
283 .word 0 # 2 bytes filler
284RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
285 L 1,14(1) # 4 bytes Load offset in symbol table in r1
286 BRC 15,-x # 4 bytes Jump to start of PLT
287 .word 0,0,0 # 6 bytes filler
288 .long ? # 4 bytes offset into symbol table
289
290Total = 32 bytes per PLT entry
291
292 The code for static build PLT entries looks like this:
293
294PLT1: BASR 1,0 # 2 bytes
295 L 1,22(1) # 4 bytes Load address of GOT entry
296 L 1,0(0,1) # 4 bytes Load address from GOT in r1
297 BCR 15,1 # 2 bytes Jump to address
298RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
299 L 1,14(1) # 4 bytes Load offset in symbol table in r1
300 BRC 15,-x # 4 bytes Jump to start of PLT
301 .word 0 # 2 bytes filler
302 .long ? # 4 bytes address of GOT entry
303 .long ? # 4 bytes offset into symbol table */
304
305#define PLT_PIC_ENTRY_WORD0 0x0d105810
306#define PLT_PIC_ENTRY_WORD1 0x10165811
307#define PLT_PIC_ENTRY_WORD2 0xc00007f1
308#define PLT_PIC_ENTRY_WORD3 0x0d105810
309#define PLT_PIC_ENTRY_WORD4 0x100ea7f4
310
311#define PLT_PIC12_ENTRY_WORD0 0x5810c000
312#define PLT_PIC12_ENTRY_WORD1 0x07f10000
313#define PLT_PIC12_ENTRY_WORD2 0x00000000
314#define PLT_PIC12_ENTRY_WORD3 0x0d105810
315#define PLT_PIC12_ENTRY_WORD4 0x100ea7f4
316
317#define PLT_PIC16_ENTRY_WORD0 0xa7180000
318#define PLT_PIC16_ENTRY_WORD1 0x5811c000
319#define PLT_PIC16_ENTRY_WORD2 0x07f10000
320#define PLT_PIC16_ENTRY_WORD3 0x0d105810
321#define PLT_PIC16_ENTRY_WORD4 0x100ea7f4
322
323#define PLT_ENTRY_WORD0 0x0d105810
324#define PLT_ENTRY_WORD1 0x10165810
325#define PLT_ENTRY_WORD2 0x100007f1
326#define PLT_ENTRY_WORD3 0x0d105810
327#define PLT_ENTRY_WORD4 0x100ea7f4
328
329/* The first PLT entry pushes the offset into the symbol table
330 from R1 onto the stack at 8(15) and the loader object info
331 at 12(15), loads the loader address in R1 and jumps to it. */
332
333/* The first entry in the PLT for PIC code:
334
335PLT0:
336 ST 1,28(15) # R1 has offset into symbol table
337 L 1,4(12) # Get loader ino(object struct address)
dc810e39 338 ST 1,24(15) # Store address
a85d7ed0
NC		 339 L 1,8(12) # Entry address of loader in R1
340 BR 1 # Jump to loader
341
342 The first entry in the PLT for static code:
343
344PLT0:
345 ST 1,28(15) # R1 has offset into symbol table
346 BASR 1,0
347 L 1,18(0,1) # Get address of GOT
348 MVC 24(4,15),4(1) # Move loader ino to stack
349 L 1,8(1) # Get address of loader
350 BR 1 # Jump to loader
351 .word 0 # filler
352 .long got # address of GOT */
353
354#define PLT_PIC_FIRST_ENTRY_WORD0 0x5010f01c
355#define PLT_PIC_FIRST_ENTRY_WORD1 0x5810c004
356#define PLT_PIC_FIRST_ENTRY_WORD2 0x5010f018
357#define PLT_PIC_FIRST_ENTRY_WORD3 0x5810c008
358#define PLT_PIC_FIRST_ENTRY_WORD4 0x07f10000
359
360#define PLT_FIRST_ENTRY_WORD0 0x5010f01c
361#define PLT_FIRST_ENTRY_WORD1 0x0d105810
362#define PLT_FIRST_ENTRY_WORD2 0x1012D203
363#define PLT_FIRST_ENTRY_WORD3 0xf0181004
364#define PLT_FIRST_ENTRY_WORD4 0x58101008
365#define PLT_FIRST_ENTRY_WORD5 0x07f10000
366
367/* The s390 linker needs to keep track of the number of relocs that it
368 decides to copy in check_relocs for each symbol. This is so that
369 it can discard PC relative relocs if it doesn't need them when
370 linking with -Bsymbolic. We store the information in a field
371 extending the regular ELF linker hash table. */
372
373/* This structure keeps track of the number of PC relative relocs we
374 have copied for a given symbol. */
375
376struct elf_s390_pcrel_relocs_copied
377{
378 /* Next section. */
379 struct elf_s390_pcrel_relocs_copied *next;
380 /* A section in dynobj. */
381 asection *section;
382 /* Number of relocs copied in this section. */
383 bfd_size_type count;
384};
385
386/* s390 ELF linker hash entry. */
387
388struct elf_s390_link_hash_entry
389{
390 struct elf_link_hash_entry root;
391
392 /* Number of PC relative relocs copied for this symbol. */
393 struct elf_s390_pcrel_relocs_copied *pcrel_relocs_copied;
394};
395
396/* s390 ELF linker hash table. */
397
398struct elf_s390_link_hash_table
399{
400 struct elf_link_hash_table root;
401};
402
403/* Declare this now that the above structures are defined. */
404
405static boolean elf_s390_discard_copies
406 PARAMS ((struct elf_s390_link_hash_entry *, PTR));
407
408/* Traverse an s390 ELF linker hash table. */
409
410#define elf_s390_link_hash_traverse(table, func, info) \
411 (elf_link_hash_traverse \
412 (&(table)->root, \
413 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
414 (info)))
415
416/* Get the s390 ELF linker hash table from a link_info structure. */
417
418#define elf_s390_hash_table(p) \
419 ((struct elf_s390_link_hash_table *) ((p)->hash))
420
421/* Create an entry in an s390 ELF linker hash table. */
422
423static struct bfd_hash_entry *
424elf_s390_link_hash_newfunc (entry, table, string)
425 struct bfd_hash_entry *entry;
426 struct bfd_hash_table *table;
427 const char *string;
428{
429 struct elf_s390_link_hash_entry *ret =
430 (struct elf_s390_link_hash_entry *) entry;
431
432 /* Allocate the structure if it has not already been allocated by a
433 subclass. */
434 if (ret == (struct elf_s390_link_hash_entry *) NULL)
435 ret = ((struct elf_s390_link_hash_entry *)
436 bfd_hash_allocate (table,
437 sizeof (struct elf_s390_link_hash_entry)));
438 if (ret == (struct elf_s390_link_hash_entry *) NULL)
439 return (struct bfd_hash_entry *) ret;
440
441 /* Call the allocation method of the superclass. */
442 ret = ((struct elf_s390_link_hash_entry *)
443 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
444 table, string));
445 if (ret != (struct elf_s390_link_hash_entry *) NULL)
446 {
447 ret->pcrel_relocs_copied = NULL;
448 }
449
450 return (struct bfd_hash_entry *) ret;
451}
452
453/* Create an s390 ELF linker hash table. */
454
455static struct bfd_link_hash_table *
456elf_s390_link_hash_table_create (abfd)
457 bfd *abfd;
458{
459 struct elf_s390_link_hash_table *ret;
dc810e39 460 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
a85d7ed0 461
dc810e39 462 ret = (struct elf_s390_link_hash_table *) bfd_alloc (abfd, amt);
a85d7ed0
NC		 463 if (ret == (struct elf_s390_link_hash_table *) NULL)
464 return NULL;
465
466 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
467 elf_s390_link_hash_newfunc))
468 {
469 bfd_release (abfd, ret);
470 return NULL;
471 }
472
473 return &ret->root.root;
474}
475
476
477/* Look through the relocs for a section during the first phase, and
478 allocate space in the global offset table or procedure linkage
479 table. */
480
481static boolean
482elf_s390_check_relocs (abfd, info, sec, relocs)
483 bfd *abfd;
484 struct bfd_link_info *info;
485 asection *sec;
486 const Elf_Internal_Rela *relocs;
487{
488 bfd *dynobj;
489 Elf_Internal_Shdr *symtab_hdr;
490 struct elf_link_hash_entry **sym_hashes;
491 bfd_signed_vma *local_got_refcounts;
492 const Elf_Internal_Rela *rel;
493 const Elf_Internal_Rela *rel_end;
494 asection *sgot;
495 asection *srelgot;
496 asection *sreloc;
497
498 if (info->relocateable)
499 return true;
500
501 dynobj = elf_hash_table (info)->dynobj;
502 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
503 sym_hashes = elf_sym_hashes (abfd);
504 local_got_refcounts = elf_local_got_offsets (abfd);
505
506 sgot = NULL;
507 srelgot = NULL;
508 sreloc = NULL;
509
510 rel_end = relocs + sec->reloc_count;
511 for (rel = relocs; rel < rel_end; rel++)
512 {
513 unsigned long r_symndx;
514 struct elf_link_hash_entry *h;
515
516 r_symndx = ELF32_R_SYM (rel->r_info);
517
518 if (r_symndx < symtab_hdr->sh_info)
519 h = NULL;
520 else
dc810e39 521 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
a85d7ed0
NC		 522
523 /* Some relocs require a global offset table. */
524 if (dynobj == NULL)
525 {
526 switch (ELF32_R_TYPE (rel->r_info))
527 {
528 case R_390_GOT12:
529 case R_390_GOT16:
530 case R_390_GOT32:
531 case R_390_GOTOFF:
532 case R_390_GOTPC:
533 elf_hash_table (info)->dynobj = dynobj = abfd;
534 if (! _bfd_elf_create_got_section (dynobj, info))
535 return false;
536 break;
537
538 default:
539 break;
540 }
541 }
542
543
544 switch (ELF32_R_TYPE (rel->r_info))
545 {
546 case R_390_GOT12:
547 case R_390_GOT16:
548 case R_390_GOT32:
549 /* This symbol requires a global offset table entry. */
550
551 if (sgot == NULL)
552 {
553 sgot = bfd_get_section_by_name (dynobj, ".got");
554 BFD_ASSERT (sgot != NULL);
555 }
556
557
558 if (srelgot == NULL
559 && (h != NULL || info->shared))
560 {
561 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
562 if (srelgot == NULL)
563 {
564 srelgot = bfd_make_section (dynobj, ".rela.got");
565 if (srelgot == NULL
566 || ! bfd_set_section_flags (dynobj, srelgot,
567 (SEC_ALLOC
568 | SEC_LOAD
569 | SEC_HAS_CONTENTS
570 | SEC_IN_MEMORY
571 | SEC_LINKER_CREATED
572 | SEC_READONLY))
573 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
574 return false;
575 }
576 }
577
578 if (h != NULL)
579 {
51b64d56 580 if (h->got.refcount == 0)
a85d7ed0 581 {
a85d7ed0
NC		 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 }
51b64d56 592 h->got.refcount += 1;
a85d7ed0
NC		 593 }
594 else
595 {
596 /* This is a global offset table entry for a local symbol. */
597 if (local_got_refcounts == NULL)
598 {
dc810e39 599 bfd_size_type size;
a85d7ed0 600
dc810e39
AM		 601 size = symtab_hdr->sh_info;
602 size *= sizeof (bfd_signed_vma);
a85d7ed0 603 local_got_refcounts = (bfd_signed_vma *)
51b64d56 604 bfd_zalloc (abfd, size);
a85d7ed0
NC		 605 if (local_got_refcounts == NULL)
606 return false;
607 elf_local_got_refcounts (abfd) = local_got_refcounts;
a85d7ed0 608 }
51b64d56 609 if (local_got_refcounts[r_symndx] == 0)
a85d7ed0 610 {
a85d7ed0
NC		 611 sgot->_raw_size += 4;
612 if (info->shared)
613 {
614 /* If we are generating a shared object, we need to
615 output a R_390_RELATIVE reloc so that the dynamic
616 linker can adjust this GOT entry. */
617 srelgot->_raw_size += sizeof (Elf32_External_Rela);
618 }
619 }
51b64d56 620 local_got_refcounts[r_symndx] += 1;
a85d7ed0
NC		 621 }
622 break;
623
624 case R_390_PLT16DBL:
625 case R_390_PLT32:
626 /* This symbol requires a procedure linkage table entry. We
627 actually build the entry in adjust_dynamic_symbol,
628 because this might be a case of linking PIC code which is
629 never referenced by a dynamic object, in which case we
630 don't need to generate a procedure linkage table entry
631 after all. */
632
633 /* If this is a local symbol, we resolve it directly without
634 creating a procedure linkage table entry. */
635 if (h == NULL)
636 continue;
637
51b64d56
AM		 638 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
639 h->plt.refcount += 1;
a85d7ed0
NC		 640 break;
641
642 case R_390_8:
643 case R_390_16:
644 case R_390_32:
645 case R_390_PC16:
646 case R_390_PC16DBL:
647 case R_390_PC32:
648 if (h != NULL)
649 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
650
651 /* If we are creating a shared library, and this is a reloc
652 against a global symbol, or a non PC relative reloc
653 against a local symbol, then we need to copy the reloc
654 into the shared library. However, if we are linking with
655 -Bsymbolic, we do not need to copy a reloc against a
656 global symbol which is defined in an object we are
657 including in the link (i.e., DEF_REGULAR is set). At
658 this point we have not seen all the input files, so it is
659 possible that DEF_REGULAR is not set now but will be set
660 later (it is never cleared). We account for that
661 possibility below by storing information in the
662 pcrel_relocs_copied field of the hash table entry. */
663 if (info->shared
664 && (sec->flags & SEC_ALLOC) != 0
665 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16 &&
666 ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL &&
667 ELF32_R_TYPE (rel->r_info) != R_390_PC32)
668 || (h != NULL
669 && (! info->symbolic
670 || (h->elf_link_hash_flags
671 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
672 {
673 /* When creating a shared object, we must copy these
674 reloc types into the output file. We create a reloc
675 section in dynobj and make room for this reloc. */
676 if (sreloc == NULL)
677 {
678 const char *name;
679
680 name = (bfd_elf_string_from_elf_section
681 (abfd,
682 elf_elfheader (abfd)->e_shstrndx,
683 elf_section_data (sec)->rel_hdr.sh_name));
684 if (name == NULL)
685 return false;
686
687 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
688 && strcmp (bfd_get_section_name (abfd, sec),
689 name + 5) == 0);
690
691 sreloc = bfd_get_section_by_name (dynobj, name);
692 if (sreloc == NULL)
693 {
694 flagword flags;
695
696 sreloc = bfd_make_section (dynobj, name);
697 flags = (SEC_HAS_CONTENTS | SEC_READONLY
698 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
699 if ((sec->flags & SEC_ALLOC) != 0)
700 flags |= SEC_ALLOC | SEC_LOAD;
701 if (sreloc == NULL
702 || ! bfd_set_section_flags (dynobj, sreloc, flags)
703 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
704 return false;
705 }
29c2fb7c
AJ		 706 if (sec->flags & SEC_READONLY)
707 info->flags |= DF_TEXTREL;
a85d7ed0
NC		 708 }
709
710 sreloc->_raw_size += sizeof (Elf32_External_Rela);
711
712 /* If we are linking with -Bsymbolic, and this is a
713 global symbol, we count the number of PC relative
714 relocations we have entered for this symbol, so that
715 we can discard them again if the symbol is later
716 defined by a regular object. Note that this function
717 is only called if we are using an elf_s390 linker
718 hash table, which means that h is really a pointer to
719 an elf_s390_link_hash_entry. */
720 if (h != NULL
721 && (ELF32_R_TYPE (rel->r_info) == R_390_PC16 ||
722 ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL ||
723 ELF32_R_TYPE (rel->r_info) == R_390_PC32))
724 {
725 struct elf_s390_link_hash_entry *eh;
726 struct elf_s390_pcrel_relocs_copied *p;
727
728 eh = (struct elf_s390_link_hash_entry *) h;
729
730 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
731 if (p->section == sreloc)
732 break;
733
734 if (p == NULL)
735 {
736 p = ((struct elf_s390_pcrel_relocs_copied *)
dc810e39 737 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
a85d7ed0
NC		 738 if (p == NULL)
739 return false;
740 p->next = eh->pcrel_relocs_copied;
741 eh->pcrel_relocs_copied = p;
742 p->section = sreloc;
743 p->count = 0;
744 }
745
746 ++p->count;
747 }
748 }
749
750 break;
751
752 /* This relocation describes the C++ object vtable hierarchy.
753 Reconstruct it for later use during GC. */
754 case R_390_GNU_VTINHERIT:
755 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
756 return false;
757 break;
758
759 /* This relocation describes which C++ vtable entries are actually
760 used. Record for later use during GC. */
761 case R_390_GNU_VTENTRY:
762 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
763 return false;
764 break;
dc810e39 765
a85d7ed0
NC		 766 default:
767 break;
768 }
769 }
770
771 return true;
772}
773
774/* Return the section that should be marked against GC for a given
775 relocation. */
776
777static asection *
778elf_s390_gc_mark_hook (abfd, info, rel, h, sym)
779 bfd *abfd;
780 struct bfd_link_info *info ATTRIBUTE_UNUSED;
781 Elf_Internal_Rela *rel;
782 struct elf_link_hash_entry *h;
783 Elf_Internal_Sym *sym;
784{
785 if (h != NULL)
786 {
787 switch (ELF32_R_TYPE (rel->r_info))
788 {
789 case R_390_GNU_VTINHERIT:
790 case R_390_GNU_VTENTRY:
791 break;
792
793 default:
794 switch (h->root.type)
795 {
796 case bfd_link_hash_defined:
797 case bfd_link_hash_defweak:
798 return h->root.u.def.section;
799
800 case bfd_link_hash_common:
801 return h->root.u.c.p->section;
802
803 default:
804 break;
805 }
806 }
807 }
808 else
809 {
810 if (!(elf_bad_symtab (abfd)
811 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
812 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
813 && sym->st_shndx != SHN_COMMON))
814 {
815 return bfd_section_from_elf_index (abfd, sym->st_shndx);
816 }
817 }
818
819 return NULL;
820}
821
822/* Update the got entry reference counts for the section being removed. */
823
824static boolean
825elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
826 bfd *abfd ATTRIBUTE_UNUSED;
827 struct bfd_link_info *info ATTRIBUTE_UNUSED;
828 asection *sec ATTRIBUTE_UNUSED;
829 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
830{
831 Elf_Internal_Shdr *symtab_hdr;
832 struct elf_link_hash_entry **sym_hashes;
833 bfd_signed_vma *local_got_refcounts;
834 const Elf_Internal_Rela *rel, *relend;
835 unsigned long r_symndx;
836 struct elf_link_hash_entry *h;
837 bfd *dynobj;
838 asection *sgot;
839 asection *srelgot;
840
841 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
842 sym_hashes = elf_sym_hashes (abfd);
843 local_got_refcounts = elf_local_got_refcounts (abfd);
844
845 dynobj = elf_hash_table (info)->dynobj;
846 if (dynobj == NULL)
847 return true;
848
849 sgot = bfd_get_section_by_name (dynobj, ".got");
850 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
851
852 relend = relocs + sec->reloc_count;
853 for (rel = relocs; rel < relend; rel++)
854 switch (ELF32_R_TYPE (rel->r_info))
855 {
856 case R_390_GOT12:
857 case R_390_GOT16:
858 case R_390_GOT32:
859 case R_390_GOTOFF:
860 case R_390_GOTPC:
861 r_symndx = ELF32_R_SYM (rel->r_info);
862 if (r_symndx >= symtab_hdr->sh_info)
863 {
864 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
865 if (h->got.refcount > 0)
866 {
867 h->got.refcount -= 1;
868 if (h->got.refcount == 0)
869 {
870 sgot->_raw_size -= 4;
871 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
872 }
873 }
874 }
875 else if (local_got_refcounts != NULL)
876 {
877 if (local_got_refcounts[r_symndx] > 0)
878 {
879 local_got_refcounts[r_symndx] -= 1;
880 if (local_got_refcounts[r_symndx] == 0)
881 {
882 sgot->_raw_size -= 4;
883 if (info->shared)
884 srelgot->_raw_size -= sizeof (Elf32_External_Rela);
885 }
886 }
887 }
888 break;
889
890 case R_390_PLT16DBL:
891 case R_390_PLT32:
892 r_symndx = ELF32_R_SYM (rel->r_info);
893 if (r_symndx >= symtab_hdr->sh_info)
894 {
895 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
896 if (h->plt.refcount > 0)
897 h->plt.refcount -= 1;
898 }
899 break;
900
901 default:
902 break;
903 }
904
905 return true;
906}
907
908/* Adjust a symbol defined by a dynamic object and referenced by a
909 regular object. The current definition is in some section of the
910 dynamic object, but we're not including those sections. We have to
911 change the definition to something the rest of the link can
912 understand. */
913
914static boolean
915elf_s390_adjust_dynamic_symbol (info, h)
916 struct bfd_link_info *info;
917 struct elf_link_hash_entry *h;
918{
919 bfd *dynobj;
920 asection *s;
921 unsigned int power_of_two;
922
923 dynobj = elf_hash_table (info)->dynobj;
924
925 /* Make sure we know what is going on here. */
926 BFD_ASSERT (dynobj != NULL
927 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
928 || h->weakdef != NULL
929 || ((h->elf_link_hash_flags
930 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
931 && (h->elf_link_hash_flags
932 & ELF_LINK_HASH_REF_REGULAR) != 0
933 && (h->elf_link_hash_flags
934 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
935
936 /* If this is a function, put it in the procedure linkage table. We
937 will fill in the contents of the procedure linkage table later
938 (although we could actually do it here). */
939 if (h->type == STT_FUNC
940 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
941 {
942 if ((! info->shared
943 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
944 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0)
945 || (info->shared && h->plt.refcount <= 0))
946 {
947 /* This case can occur if we saw a PLT32 reloc in an input
948 file, but the symbol was never referred to by a dynamic
949 object, or if all references were garbage collected. In
950 such a case, we don't actually need to build a procedure
951 linkage table, and we can just do a PC32 reloc instead. */
952 h->plt.offset = (bfd_vma) -1;
953 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
954 return true;
955 }
956
957 /* Make sure this symbol is output as a dynamic symbol. */
958 if (h->dynindx == -1)
959 {
960 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
961 return false;
962 }
963
964 s = bfd_get_section_by_name (dynobj, ".plt");
965 BFD_ASSERT (s != NULL);
966
967 /* The first entry in .plt is reserved. */
968 if (s->_raw_size == 0)
969 s->_raw_size = PLT_FIRST_ENTRY_SIZE;
970
971 /* If this symbol is not defined in a regular file, and we are
972 not generating a shared library, then set the symbol to this
973 location in the .plt. This is required to make function
974 pointers compare as equal between the normal executable and
975 the shared library. */
976 if (! info->shared
977 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
978 {
979 h->root.u.def.section = s;
980 h->root.u.def.value = s->_raw_size;
981 }
982
983 h->plt.offset = s->_raw_size;
984
985 /* Make room for this entry. */
986 s->_raw_size += PLT_ENTRY_SIZE;
987
988 /* We also need to make an entry in the .got.plt section, which
989 will be placed in the .got section by the linker script. */
990 s = bfd_get_section_by_name (dynobj, ".got.plt");
991 BFD_ASSERT (s != NULL);
992 s->_raw_size += GOT_ENTRY_SIZE;
993
994 /* We also need to make an entry in the .rela.plt section. */
995 s = bfd_get_section_by_name (dynobj, ".rela.plt");
996 BFD_ASSERT (s != NULL);
997 s->_raw_size += sizeof (Elf32_External_Rela);
998
999 return true;
1000 }
1001
1002 /* If this is a weak symbol, and there is a real definition, the
1003 processor independent code will have arranged for us to see the
1004 real definition first, and we can just use the same value. */
1005 if (h->weakdef != NULL)
1006 {
1007 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1008 || h->weakdef->root.type == bfd_link_hash_defweak);
1009 h->root.u.def.section = h->weakdef->root.u.def.section;
1010 h->root.u.def.value = h->weakdef->root.u.def.value;
1011 return true;
1012 }
1013
1014 /* This is a reference to a symbol defined by a dynamic object which
1015 is not a function. */
1016
1017 /* If we are creating a shared library, we must presume that the
1018 only references to the symbol are via the global offset table.
1019 For such cases we need not do anything here; the relocations will
1020 be handled correctly by relocate_section. */
1021 if (info->shared)
1022 return true;
1023
1024 /* If there are no references to this symbol that do not use the
1025 GOT, we don't need to generate a copy reloc. */
1026 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1027 return true;
1028
1029 /* We must allocate the symbol in our .dynbss section, which will
1030 become part of the .bss section of the executable. There will be
1031 an entry for this symbol in the .dynsym section. The dynamic
1032 object will contain position independent code, so all references
1033 from the dynamic object to this symbol will go through the global
1034 offset table. The dynamic linker will use the .dynsym entry to
1035 determine the address it must put in the global offset table, so
1036 both the dynamic object and the regular object will refer to the
1037 same memory location for the variable. */
1038
1039 s = bfd_get_section_by_name (dynobj, ".dynbss");
1040 BFD_ASSERT (s != NULL);
1041
1042 /* We must generate a R_390_COPY reloc to tell the dynamic linker
1043 to copy the initial value out of the dynamic object and into the
1044 runtime process image. We need to remember the offset into the
1045 .rel.bss section we are going to use. */
1046 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1047 {
1048 asection *srel;
1049
1050 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1051 BFD_ASSERT (srel != NULL);
1052 srel->_raw_size += sizeof (Elf32_External_Rela);
1053 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1054 }
1055
1056 /* We need to figure out the alignment required for this symbol. I
1057 have no idea how ELF linkers handle this. */
1058 power_of_two = bfd_log2 (h->size);
1059 if (power_of_two > 3)
1060 power_of_two = 3;
1061
1062 /* Apply the required alignment. */
1063 s->_raw_size = BFD_ALIGN (s->_raw_size,
1064 (bfd_size_type) (1 << power_of_two));
1065 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1066 {
1067 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
1068 return false;
1069 }
1070
1071 /* Define the symbol as being at this point in the section. */
1072 h->root.u.def.section = s;
1073 h->root.u.def.value = s->_raw_size;
1074
1075 /* Increment the section size to make room for the symbol. */
1076 s->_raw_size += h->size;
1077
1078 return true;
1079}
1080
1081/* Set the sizes of the dynamic sections. */
1082
1083static boolean
1084elf_s390_size_dynamic_sections (output_bfd, info)
29c2fb7c 1085 bfd *output_bfd ATTRIBUTE_UNUSED;
a85d7ed0
NC		 1086 struct bfd_link_info *info;
1087{
1088 bfd *dynobj;
1089 asection *s;
a85d7ed0
NC		 1090 boolean relocs;
1091 boolean plt;
1092
1093 dynobj = elf_hash_table (info)->dynobj;
1094 BFD_ASSERT (dynobj != NULL);
1095
1096 if (elf_hash_table (info)->dynamic_sections_created)
1097 {
1098 /* Set the contents of the .interp section to the interpreter. */
1099 if (! info->shared)
1100 {
1101 s = bfd_get_section_by_name (dynobj, ".interp");
1102 BFD_ASSERT (s != NULL);
1103 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1104 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1105 }
1106 }
1107 else
1108 {
1109 /* We may have created entries in the .rela.got section.
1110 However, if we are not creating the dynamic sections, we will
1111 not actually use these entries. Reset the size of .rela.got,
1112 which will cause it to get stripped from the output file
1113 below. */
1114 s = bfd_get_section_by_name (dynobj, ".rela.got");
1115 if (s != NULL)
1116 s->_raw_size = 0;
1117 }
1118
1119 /* If this is a -Bsymbolic shared link, then we need to discard all
1120 PC relative relocs against symbols defined in a regular object.
1121 We allocated space for them in the check_relocs routine, but we
1122 will not fill them in in the relocate_section routine. */
1123 if (info->shared)
1124 elf_s390_link_hash_traverse (elf_s390_hash_table (info),
1125 elf_s390_discard_copies,
1126 (PTR) info);
1127
1128 /* The check_relocs and adjust_dynamic_symbol entry points have
1129 determined the sizes of the various dynamic sections. Allocate
1130 memory for them. */
1131 plt = false;
a85d7ed0
NC		 1132 relocs = false;
1133 for (s = dynobj->sections; s != NULL; s = s->next)
1134 {
1135 const char *name;
1136 boolean strip;
1137
1138 if ((s->flags & SEC_LINKER_CREATED) == 0)
1139 continue;
1140
1141 /* It's OK to base decisions on the section name, because none
1142 of the dynobj section names depend upon the input files. */
1143 name = bfd_get_section_name (dynobj, s);
1144
1145 strip = false;
1146
1147 if (strcmp (name, ".plt") == 0)
1148 {
1149 if (s->_raw_size == 0)
1150 {
1151 /* Strip this section if we don't need it; see the
1152 comment below. */
1153 strip = true;
1154 }
1155 else
1156 {
1157 /* Remember whether there is a PLT. */
1158 plt = true;
1159 }
1160 }
1161 else if (strncmp (name, ".rela", 5) == 0)
1162 {
1163 if (s->_raw_size == 0)
1164 {
1165 /* If we don't need this section, strip it from the
1166 output file. This is to handle .rela.bss and
1167 .rel.plt. We must create it in
1168 create_dynamic_sections, because it must be created
1169 before the linker maps input sections to output
1170 sections. The linker does that before
1171 adjust_dynamic_symbol is called, and it is that
1172 function which decides whether anything needs to go
1173 into these sections. */
1174 strip = true;
1175 }
1176 else
1177 {
a85d7ed0
NC		 1178 /* Remember whether there are any reloc sections other
1179 than .rela.plt. */
1180 if (strcmp (name, ".rela.plt") != 0)
29c2fb7c 1181 relocs = true;
a85d7ed0
NC		 1182
1183 /* We use the reloc_count field as a counter if we need
1184 to copy relocs into the output file. */
1185 s->reloc_count = 0;
1186 }
1187 }
1188 else if (strncmp (name, ".got", 4) != 0)
1189 {
1190 /* It's not one of our sections, so don't allocate space. */
1191 continue;
1192 }
1193
1194 if (strip)
1195 {
1196 _bfd_strip_section_from_output (info, s);
1197 continue;
1198 }
1199
1200 /* Allocate memory for the section contents. */
1201 s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size);
1202 if (s->contents == NULL && s->_raw_size != 0)
1203 return false;
1204 }
1205
1206 if (elf_hash_table (info)->dynamic_sections_created)
1207 {
1208 /* Add some entries to the .dynamic section. We fill in the
1209 values later, in elf_s390_finish_dynamic_sections, but we
1210 must add the entries now so that we get the correct size for
1211 the .dynamic section. The DT_DEBUG entry is filled in by the
1212 dynamic linker and used by the debugger. */
dc810e39
AM		 1213#define add_dynamic_entry(TAG, VAL) \
1214 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1215
a85d7ed0
NC		 1216 if (! info->shared)
1217 {
dc810e39 1218 if (!add_dynamic_entry (DT_DEBUG, 0))
a85d7ed0
NC		 1219 return false;
1220 }
1221
1222 if (plt)
1223 {
dc810e39
AM		 1224 if (!add_dynamic_entry (DT_PLTGOT, 0)
1225 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1226 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1227 || !add_dynamic_entry (DT_JMPREL, 0))
a85d7ed0
NC		 1228 return false;
1229 }
1230
1231 if (relocs)
1232 {
dc810e39
AM		 1233 if (!add_dynamic_entry (DT_RELA, 0)
1234 || !add_dynamic_entry (DT_RELASZ, 0)
1235 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
a85d7ed0
NC		 1236 return false;
1237 }
1238
29c2fb7c 1239 if ((info->flags & DF_TEXTREL) != 0)
a85d7ed0 1240 {
dc810e39 1241 if (!add_dynamic_entry (DT_TEXTREL, 0))
a85d7ed0
NC		 1242 return false;
1243 info->flags |= DF_TEXTREL;
1244 }
1245 }
dc810e39 1246#undef add_dynamic_entry
a85d7ed0
NC		 1247
1248 return true;
1249}
1250
1251/* This function is called via elf_s390_link_hash_traverse if we are
1252 creating a shared object with -Bsymbolic. It discards the space
1253 allocated to copy PC relative relocs against symbols which are
1254 defined in regular objects. We allocated space for them in the
1255 check_relocs routine, but we won't fill them in in the
1256 relocate_section routine. */
1257
1258/*ARGSUSED*/
1259static boolean
1260elf_s390_discard_copies (h, inf)
1261 struct elf_s390_link_hash_entry *h;
1262 PTR inf;
1263{
1264 struct elf_s390_pcrel_relocs_copied *s;
1265 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1266
1267 /* If a symbol has been forced local or we have found a regular
1268 definition for the symbolic link case, then we won't be needing
1269 any relocs. */
1270 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1271 && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
1272 || info->symbolic))
1273 {
1274 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1275 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);
1276 }
1277 return true;
1278}
1279/* Relocate a 390 ELF section. */
1280
1281static boolean
1282elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
1283 contents, relocs, local_syms, local_sections)
1284 bfd *output_bfd;
1285 struct bfd_link_info *info;
1286 bfd *input_bfd;
1287 asection *input_section;
1288 bfd_byte *contents;
1289 Elf_Internal_Rela *relocs;
1290 Elf_Internal_Sym *local_syms;
1291 asection **local_sections;
1292{
1293 bfd *dynobj;
1294 Elf_Internal_Shdr *symtab_hdr;
1295 struct elf_link_hash_entry **sym_hashes;
1296 bfd_vma *local_got_offsets;
1297 asection *sgot;
1298 asection *splt;
1299 asection *sreloc;
1300 Elf_Internal_Rela *rel;
1301 Elf_Internal_Rela *relend;
1302
1303 dynobj = elf_hash_table (info)->dynobj;
1304 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1305 sym_hashes = elf_sym_hashes (input_bfd);
1306 local_got_offsets = elf_local_got_offsets (input_bfd);
1307
1308 sgot = NULL;
1309 splt = NULL;
1310 sreloc = NULL;
1311 if (dynobj != NULL)
1312 {
1313 splt = bfd_get_section_by_name (dynobj, ".plt");
1314 sgot = bfd_get_section_by_name (dynobj, ".got");
1315 }
1316
1317 rel = relocs;
1318 relend = relocs + input_section->reloc_count;
1319 for (; rel < relend; rel++)
1320 {
1321 int r_type;
1322 reloc_howto_type *howto;
1323 unsigned long r_symndx;
1324 struct elf_link_hash_entry *h;
1325 Elf_Internal_Sym *sym;
1326 asection *sec;
1327 bfd_vma relocation;
1328 bfd_reloc_status_type r;
1329
1330 r_type = ELF32_R_TYPE (rel->r_info);
1331 if (r_type == (int) R_390_GNU_VTINHERIT
1332 || r_type == (int) R_390_GNU_VTENTRY)
1333 continue;
1334 if (r_type < 0 || r_type >= (int) R_390_max)
1335 {
1336 bfd_set_error (bfd_error_bad_value);
1337 return false;
1338 }
1339 howto = elf_howto_table + r_type;
1340
1341 r_symndx = ELF32_R_SYM (rel->r_info);
1342
1343 if (info->relocateable)
1344 {
1345 /* This is a relocateable link. We don't have to change
1346 anything, unless the reloc is against a section symbol,
1347 in which case we have to adjust according to where the
1348 section symbol winds up in the output section. */
1349 if (r_symndx < symtab_hdr->sh_info)
1350 {
1351 sym = local_syms + r_symndx;
1352 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1353 {
1354 sec = local_sections[r_symndx];
1355 rel->r_addend += sec->output_offset + sym->st_value;
1356 }
1357 }
1358
1359 continue;
1360 }
1361
1362 /* This is a final link. */
1363 h = NULL;
1364 sym = NULL;
1365 sec = NULL;
1366 if (r_symndx < symtab_hdr->sh_info)
1367 {
1368 sym = local_syms + r_symndx;
1369 sec = local_sections[r_symndx];
1370 relocation = (sec->output_section->vma
1371 + sec->output_offset
1372 + sym->st_value);
1373 }
1374 else
1375 {
1376 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1377 while (h->root.type == bfd_link_hash_indirect
1378 || h->root.type == bfd_link_hash_warning)
1379 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1380 if (h->root.type == bfd_link_hash_defined
1381 || h->root.type == bfd_link_hash_defweak)
1382 {
1383 sec = h->root.u.def.section;
1384 if (r_type == R_390_GOTPC
1385 || ((r_type == R_390_PLT16DBL ||
1386 r_type == R_390_PLT32)
1387 && splt != NULL
1388 && h->plt.offset != (bfd_vma) -1)
1389 || ((r_type == R_390_GOT12 ||
1390 r_type == R_390_GOT16 ||
1391 r_type == R_390_GOT32)
1392 && elf_hash_table (info)->dynamic_sections_created
1393 && (! info->shared
1394 || (! info->symbolic && h->dynindx != -1)
1395 || (h->elf_link_hash_flags
1396 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1397 || (info->shared
1398 && ((! info->symbolic && h->dynindx != -1)
1399 || (h->elf_link_hash_flags
1400 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1401 && ( r_type == R_390_8 ||
1402 r_type == R_390_16 ||
1403 r_type == R_390_32 ||
1404 r_type == R_390_PC16 ||
1405 r_type == R_390_PC16DBL ||
1406 r_type == R_390_PC32)
1407 && ((input_section->flags & SEC_ALLOC) != 0
1408 /* DWARF will emit R_386_32 relocations in its
1409 sections against symbols defined externally
1410 in shared libraries. We can't do anything
1411 with them here. */
1412 || ((input_section->flags & SEC_DEBUGGING) != 0
1413 && (h->elf_link_hash_flags
1414 & ELF_LINK_HASH_DEF_DYNAMIC) != 0))))
1415 {
1416 /* In these cases, we don't need the relocation
1417 value. We check specially because in some
1418 obscure cases sec->output_section will be NULL. */
1419 relocation = 0;
1420 }
1421 else if (sec->output_section == NULL)
1422 {
1423 (*_bfd_error_handler)
1424 (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
8f615d07 1425 bfd_archive_filename (input_bfd), h->root.root.string,
a85d7ed0
NC		 1426 bfd_get_section_name (input_bfd, input_section));
1427 relocation = 0;
1428 }
1429 else
1430 relocation = (h->root.u.def.value
1431 + sec->output_section->vma
1432 + sec->output_offset);
1433 }
1434 else if (h->root.type == bfd_link_hash_undefweak)
1435 relocation = 0;
671bae9c
NC		 1436 else if (info->shared
1437 && (!info->symbolic || info->allow_shlib_undefined)
a85d7ed0
NC		 1438 && !info->no_undefined
1439 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1440 relocation = 0;
1441 else
1442 {
1443 if (! ((*info->callbacks->undefined_symbol)
1444 (info, h->root.root.string, input_bfd,
1445 input_section, rel->r_offset,
1446 (!info->shared || info->no_undefined
1447 || ELF_ST_VISIBILITY (h->other)))))
1448 return false;
1449 relocation = 0;
1450 }
1451 }
1452
1453 switch (r_type)
1454 {
1455 case R_390_GOT12:
1456 case R_390_GOT16:
1457 case R_390_GOT32:
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_32 (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 4. 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_32 (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 = ELF32_R_INFO (0, R_390_RELATIVE);
1527 outrel.r_addend = relocation;
1528 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1529 (((Elf32_External_Rela *)
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 break;
dc810e39 1543
a85d7ed0
NC		 1544 case R_390_GOTOFF:
1545 /* Relocation is relative to the start of the global offset
1546 table. */
1547
1548 if (sgot == NULL)
1549 {
1550 sgot = bfd_get_section_by_name (dynobj, ".got");
1551 BFD_ASSERT (sgot != NULL);
1552 }
1553
1554 /* Note that sgot->output_offset is not involved in this
1555 calculation. We always want the start of .got. If we
1556 defined _GLOBAL_OFFSET_TABLE in a different way, as is
1557 permitted by the ABI, we might have to change this
1558 calculation. */
1559 relocation -= sgot->output_section->vma;
1560
1561 break;
1562
1563 case R_390_GOTPC:
1564 /* Use global offset table as symbol value. */
1565
1566 if (sgot == NULL)
1567 {
1568 sgot = bfd_get_section_by_name (dynobj, ".got");
1569 BFD_ASSERT (sgot != NULL);
1570 }
1571
1572 relocation = sgot->output_section->vma;
1573
1574 break;
1575
1576 case R_390_PLT16DBL:
1577 case R_390_PLT32:
1578 /* Relocation is to the entry for this symbol in the
1579 procedure linkage table. */
1580
1581 /* Resolve a PLT32 reloc against a local symbol directly,
1582 without using the procedure linkage table. */
1583 if (h == NULL)
1584 break;
1585
1586 if (h->plt.offset == (bfd_vma) -1 || splt == NULL)
1587 {
1588 /* We didn't make a PLT entry for this symbol. This
1589 happens when statically linking PIC code, or when
1590 using -Bsymbolic. */
1591 break;
1592 }
1593
1594 relocation = (splt->output_section->vma
1595 + splt->output_offset
1596 + h->plt.offset);
1597
1598 break;
1599
1600 case R_390_8:
1601 case R_390_16:
1602 case R_390_32:
1603 case R_390_PC16:
1604 case R_390_PC16DBL:
1605 case R_390_PC32:
1606 if (info->shared
1607 && (input_section->flags & SEC_ALLOC) != 0
1608 && ((r_type != R_390_PC16 &&
1609 r_type != R_390_PC16DBL &&
1610 r_type != R_390_PC32)
1611 || (h != NULL
1612 && h->dynindx != -1
1613 && (! info->symbolic
1614 || (h->elf_link_hash_flags
1615 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1616 {
1617 Elf_Internal_Rela outrel;
1618 boolean skip, relocate;
1619
1620 /* When generating a shared object, these relocations
1621 are copied into the output file to be resolved at run
1622 time. */
1623
1624 if (sreloc == NULL)
1625 {
1626 const char *name;
1627
1628 name = (bfd_elf_string_from_elf_section
1629 (input_bfd,
1630 elf_elfheader (input_bfd)->e_shstrndx,
1631 elf_section_data (input_section)->rel_hdr.sh_name));
1632 if (name == NULL)
1633 return false;
1634
1635 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1636 && strcmp (bfd_get_section_name (input_bfd,
1637 input_section),
1638 name + 5) == 0);
1639
1640 sreloc = bfd_get_section_by_name (dynobj, name);
1641 BFD_ASSERT (sreloc != NULL);
1642 }
1643
1644 skip = false;
1645
1646 if (elf_section_data (input_section)->stab_info == NULL)
1647 outrel.r_offset = rel->r_offset;
1648 else
1649 {
1650 bfd_vma off;
1651
1652 off = (_bfd_stab_section_offset
1653 (output_bfd, &elf_hash_table (info)->stab_info,
1654 input_section,
1655 &elf_section_data (input_section)->stab_info,
1656 rel->r_offset));
1657 if (off == (bfd_vma) -1)
1658 skip = true;
1659 outrel.r_offset = off;
1660 }
1661
1662 outrel.r_offset += (input_section->output_section->vma
1663 + input_section->output_offset);
1664
1665 if (skip)
1666 {
1667 memset (&outrel, 0, sizeof outrel);
1668 relocate = false;
1669 }
1670 else if (r_type == R_390_PC16 ||
1671 r_type == R_390_PC16DBL ||
1672 r_type == R_390_PC32)
1673 {
1674 BFD_ASSERT (h != NULL && h->dynindx != -1);
1675 relocate = false;
1676 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1677 outrel.r_addend = relocation + rel->r_addend;
1678 }
1679 else
1680 {
1681 /* h->dynindx may be -1 if this symbol was marked to
1682 become local. */
1683 if (h == NULL
1684 || ((info->symbolic || h->dynindx == -1)
1685 && (h->elf_link_hash_flags
1686 & ELF_LINK_HASH_DEF_REGULAR) != 0))
1687 {
1688 relocate = true;
1689 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
1690 outrel.r_addend = relocation + rel->r_addend;
1691 }
1692 else
1693 {
1694 BFD_ASSERT (h->dynindx != -1);
1695 relocate = false;
1696 outrel.r_info = ELF32_R_INFO (h->dynindx, R_390_32);
1697 outrel.r_addend = relocation + rel->r_addend;
1698 }
1699 }
1700
1701 bfd_elf32_swap_reloca_out (output_bfd, &outrel,
1702 (((Elf32_External_Rela *)
1703 sreloc->contents)
1704 + sreloc->reloc_count));
1705 ++sreloc->reloc_count;
1706
1707 /* If this reloc is against an external symbol, we do
1708 not want to fiddle with the addend. Otherwise, we
1709 need to include the symbol value so that it becomes
1710 an addend for the dynamic reloc. */
1711 if (! relocate)
1712 continue;
1713 }
1714
1715 break;
1716
1717 default:
1718 break;
1719 }
1720
1721 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1722 contents, rel->r_offset,
1723 relocation, rel->r_addend);
1724
1725 if (r != bfd_reloc_ok)
1726 {
1727 switch (r)
1728 {
1729 default:
1730 case bfd_reloc_outofrange:
1731 abort ();
1732 case bfd_reloc_overflow:
1733 {
1734 const char *name;
1735
1736 if (h != NULL)
1737 name = h->root.root.string;
1738 else
1739 {
1740 name = bfd_elf_string_from_elf_section (input_bfd,
1741 symtab_hdr->sh_link,
1742 sym->st_name);
1743 if (name == NULL)
1744 return false;
1745 if (*name == '\0')
1746 name = bfd_section_name (input_bfd, sec);
1747 }
1748 if (! ((*info->callbacks->reloc_overflow)
1749 (info, name, howto->name, (bfd_vma) 0,
1750 input_bfd, input_section, rel->r_offset)))
1751 return false;
1752 }
1753 break;
1754 }
1755 }
1756 }
1757
1758 return true;
1759}
1760
1761/* Finish up dynamic symbol handling. We set the contents of various
1762 dynamic sections here. */
1763
1764static boolean
1765elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
1766 bfd *output_bfd;
1767 struct bfd_link_info *info;
1768 struct elf_link_hash_entry *h;
1769 Elf_Internal_Sym *sym;
1770{
1771 bfd *dynobj;
1772
1773 dynobj = elf_hash_table (info)->dynobj;
1774
1775 if (h->plt.offset != (bfd_vma) -1)
1776 {
1777 asection *splt;
1778 asection *srela;
1779 Elf_Internal_Rela rela;
1780 bfd_vma relative_offset;
1781 bfd_vma got_offset;
1782 bfd_vma plt_index;
1783 asection *sgot;
1784
1785 /* This symbol has an entry in the procedure linkage table. Set
1786 it up. */
1787
1788 BFD_ASSERT (h->dynindx != -1);
1789
1790 splt = bfd_get_section_by_name (dynobj, ".plt");
1791 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1792 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1793 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1794
dc810e39 1795 /* Calc. index no.
a85d7ed0
NC		 1796 Current offset - size first entry / entry size. */
1797 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
1798
1799 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
1800 addr & GOT addr. */
1801 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
1802
1803 /* S390 uses halfwords for relative branch calc! */
dc810e39
AM		 1804 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
1805 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
a85d7ed0
NC		 1806 /* If offset is > 32768, branch to a previous branch
1807 390 can only handle +-64 K jumps. */
dc810e39
AM		 1808 if ( -32768 > (int) relative_offset )
1809 relative_offset =
1810 -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
a85d7ed0
NC		 1811
1812 /* Fill in the entry in the procedure linkage table. */
1813 if (!info->shared)
1814 {
dc810e39 1815 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
a85d7ed0 1816 splt->contents + h->plt.offset);
dc810e39 1817 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
a85d7ed0 1818 splt->contents + h->plt.offset + 4);
dc810e39 1819 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
a85d7ed0 1820 splt->contents + h->plt.offset + 8);
dc810e39 1821 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
a85d7ed0 1822 splt->contents + h->plt.offset + 12);
dc810e39 1823 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
a85d7ed0 1824 splt->contents + h->plt.offset + 16);
dc810e39 1825 bfd_put_32 (output_bfd, (bfd_vma) 0 + (relative_offset << 16),
a85d7ed0
NC		 1826 splt->contents + h->plt.offset + 20);
1827 bfd_put_32 (output_bfd,
dc810e39
AM		 1828 (sgot->output_section->vma
1829 + sgot->output_offset
1830 + got_offset),
a85d7ed0
NC		 1831 splt->contents + h->plt.offset + 24);
1832 }
1833 else if (got_offset < 4096)
1834 {
dc810e39 1835 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD0 + got_offset,
a85d7ed0 1836 splt->contents + h->plt.offset);
dc810e39 1837 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD1,
a85d7ed0 1838 splt->contents + h->plt.offset + 4);
dc810e39 1839 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD2,
a85d7ed0 1840 splt->contents + h->plt.offset + 8);
dc810e39 1841 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD3,
a85d7ed0 1842 splt->contents + h->plt.offset + 12);
dc810e39 1843 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD4,
a85d7ed0 1844 splt->contents + h->plt.offset + 16);
dc810e39 1845 bfd_put_32 (output_bfd, (bfd_vma) 0 + (relative_offset << 16),
a85d7ed0 1846 splt->contents + h->plt.offset + 20);
dc810e39 1847 bfd_put_32 (output_bfd, (bfd_vma) 0,
a85d7ed0
NC		 1848 splt->contents + h->plt.offset + 24);
1849 }
1850 else if (got_offset < 32768)
1851 {
dc810e39 1852 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD0 + got_offset,
a85d7ed0 1853 splt->contents + h->plt.offset);
dc810e39 1854 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD1,
a85d7ed0 1855 splt->contents + h->plt.offset + 4);
dc810e39 1856 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD2,
a85d7ed0 1857 splt->contents + h->plt.offset + 8);
dc810e39 1858 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD3,
a85d7ed0 1859 splt->contents + h->plt.offset + 12);
dc810e39 1860 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD4,
a85d7ed0 1861 splt->contents + h->plt.offset + 16);
dc810e39 1862 bfd_put_32 (output_bfd, (bfd_vma) 0 + (relative_offset << 16),
a85d7ed0 1863 splt->contents + h->plt.offset + 20);
dc810e39 1864 bfd_put_32 (output_bfd, (bfd_vma) 0,
a85d7ed0
NC		 1865 splt->contents + h->plt.offset + 24);
1866 }
1867 else
1868 {
dc810e39 1869 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD0,
a85d7ed0 1870 splt->contents + h->plt.offset);
dc810e39 1871 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD1,
a85d7ed0 1872 splt->contents + h->plt.offset + 4);
dc810e39 1873 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD2,
a85d7ed0 1874 splt->contents + h->plt.offset + 8);
dc810e39 1875 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD3,
a85d7ed0 1876 splt->contents + h->plt.offset + 12);
dc810e39 1877 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD4,
a85d7ed0 1878 splt->contents + h->plt.offset + 16);
dc810e39 1879 bfd_put_32 (output_bfd, (bfd_vma) 0 + (relative_offset << 16),
a85d7ed0
NC		 1880 splt->contents + h->plt.offset + 20);
1881 bfd_put_32 (output_bfd, got_offset,
1882 splt->contents + h->plt.offset + 24);
1883 }
1884 /* Insert offset into reloc. table here. */
1885 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
1886 splt->contents + h->plt.offset + 28);
1887 /* Fill in the entry in the .rela.plt section. */
1888 rela.r_offset = (sgot->output_section->vma
1889 + sgot->output_offset
1890 + got_offset);
1891 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
1892 rela.r_addend = 0;
1893 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1894 ((Elf32_External_Rela *) srela->contents
1895 + plt_index ));
1896
1897 /* Fill in the entry in the global offset table.
1898 Points to instruction after GOT offset. */
1899 bfd_put_32 (output_bfd,
1900 (splt->output_section->vma
1901 + splt->output_offset
1902 + h->plt.offset
1903 + 12),
1904 sgot->contents + got_offset);
1905
1906
1907 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1908 {
1909 /* Mark the symbol as undefined, rather than as defined in
1910 the .plt section. Leave the value alone. */
1911 sym->st_shndx = SHN_UNDEF;
1912 }
1913 }
1914
1915 if (h->got.offset != (bfd_vma) -1)
1916 {
1917 asection *sgot;
1918 asection *srela;
1919 Elf_Internal_Rela rela;
1920
1921 /* This symbol has an entry in the global offset table. Set it
1922 up. */
1923
1924 sgot = bfd_get_section_by_name (dynobj, ".got");
1925 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1926 BFD_ASSERT (sgot != NULL && srela != NULL);
1927
1928 rela.r_offset = (sgot->output_section->vma
1929 + sgot->output_offset
dc810e39 1930 + (h->got.offset &~ (bfd_vma) 1));
a85d7ed0
NC		 1931
1932 /* If this is a static link, or it is a -Bsymbolic link and the
1933 symbol is defined locally or was forced to be local because
1934 of a version file, we just want to emit a RELATIVE reloc.
1935 The entry in the global offset table will already have been
1936 initialized in the relocate_section function. */
1937 if (! elf_hash_table (info)->dynamic_sections_created
1938 || (info->shared
1939 && (info->symbolic || h->dynindx == -1)
1940 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1941 {
1942 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
1943 rela.r_addend = (h->root.u.def.value
1944 + h->root.u.def.section->output_section->vma
1945 + h->root.u.def.section->output_offset);
1946 }
1947 else
1948 {
1949 BFD_ASSERT((h->got.offset & 1) == 0);
1950 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
1951 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
1952 rela.r_addend = 0;
1953 }
1954
1955 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1956 ((Elf32_External_Rela *) srela->contents
1957 + srela->reloc_count));
1958 ++srela->reloc_count;
1959 }
1960
1961 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1962 {
1963 asection *s;
1964 Elf_Internal_Rela rela;
1965
1966 /* This symbols needs a copy reloc. Set it up. */
1967
1968 BFD_ASSERT (h->dynindx != -1
1969 && (h->root.type == bfd_link_hash_defined
1970 || h->root.type == bfd_link_hash_defweak));
1971
1972
1973 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1974 ".rela.bss");
1975 BFD_ASSERT (s != NULL);
1976
1977 rela.r_offset = (h->root.u.def.value
1978 + h->root.u.def.section->output_section->vma
1979 + h->root.u.def.section->output_offset);
1980 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
1981 rela.r_addend = 0;
1982 bfd_elf32_swap_reloca_out (output_bfd, &rela,
1983 ((Elf32_External_Rela *) s->contents
1984 + s->reloc_count));
1985 ++s->reloc_count;
1986 }
1987
1988 /* Mark some specially defined symbols as absolute. */
1989 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1990 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
1991 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
1992 sym->st_shndx = SHN_ABS;
1993
1994 return true;
1995}
1996
1997/* Finish up the dynamic sections. */
1998
1999static boolean
2000elf_s390_finish_dynamic_sections (output_bfd, info)
2001 bfd *output_bfd;
2002 struct bfd_link_info *info;
2003{
2004 bfd *dynobj;
2005 asection *sdyn;
2006 asection *sgot;
2007
2008 dynobj = elf_hash_table (info)->dynobj;
2009
2010 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
2011 BFD_ASSERT (sgot != NULL);
2012 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2013
2014 if (elf_hash_table (info)->dynamic_sections_created)
2015 {
2016 asection *splt;
2017 Elf32_External_Dyn *dyncon, *dynconend;
2018
2019 BFD_ASSERT (sdyn != NULL);
2020
2021 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2022 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2023 for (; dyncon < dynconend; dyncon++)
2024 {
2025 Elf_Internal_Dyn dyn;
2026 const char *name;
2027 asection *s;
2028
2029 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
2030
2031 switch (dyn.d_tag)
2032 {
2033 default:
2034 break;
2035
2036 case DT_PLTGOT:
2037 name = ".got";
2038 goto get_vma;
2039 case DT_JMPREL:
2040 name = ".rela.plt";
2041 get_vma:
2042 s = bfd_get_section_by_name(output_bfd, name);
2043 BFD_ASSERT (s != NULL);
2044 dyn.d_un.d_ptr = s->vma;
2045 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2046 break;
2047
2048 case DT_PLTRELSZ:
2049 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2050 BFD_ASSERT (s != NULL);
2051 if (s->_cooked_size != 0)
2052 dyn.d_un.d_val = s->_cooked_size;
2053 else
2054 dyn.d_un.d_val = s->_raw_size;
2055 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
2056 break;
2057 }
2058 }
2059
2060 /* Fill in the special first entry in the procedure linkage table. */
2061 splt = bfd_get_section_by_name (dynobj, ".plt");
2062 if (splt && splt->_raw_size > 0)
2063 {
2064 memset (splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
2065 if (info->shared)
2066 {
dc810e39 2067 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD0,
a85d7ed0 2068 splt->contents );
dc810e39
AM		 2069 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD1,
2070 splt->contents + 4 );
2071 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD2,
2072 splt->contents + 8 );
2073 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD3,
2074 splt->contents + 12 );
2075 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD4,
2076 splt->contents + 16 );
a85d7ed0
NC		 2077 }
2078 else
2079 {
dc810e39 2080 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0,
a85d7ed0 2081 splt->contents );
dc810e39
AM		 2082 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
2083 splt->contents + 4 );
2084 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD2,
2085 splt->contents + 8 );
2086 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
2087 splt->contents + 12 );
2088 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
2089 splt->contents + 16 );
2090 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
2091 splt->contents + 20 );
a85d7ed0
NC		 2092 bfd_put_32 (output_bfd,
2093 sgot->output_section->vma + sgot->output_offset,
2094 splt->contents + 24);
2095 }
2096 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4;
2097 }
2098
2099 }
2100
2101 /* Set the first entry in the global offset table to the address of
2102 the dynamic section. */
2103 if (sgot->_raw_size > 0)
2104 {
2105 if (sdyn == NULL)
2106 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
2107 else
2108 bfd_put_32 (output_bfd,
2109 sdyn->output_section->vma + sdyn->output_offset,
2110 sgot->contents);
2111
2112 /* One entry for shared object struct ptr. */
2113 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
2114 /* One entry for _dl_runtime_resolve. */
2115 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2116 }
2117
2118 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
2119
2120 return true;
2121}
2122
2123static boolean
2124elf_s390_object_p (abfd)
2125 bfd *abfd;
2126{
2127 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_esa);
2128}
2129
29c2fb7c 2130static enum elf_reloc_type_class
f51e552e
AM		 2131elf_s390_reloc_type_class (rela)
2132 const Elf_Internal_Rela *rela;
29c2fb7c 2133{
f51e552e 2134 switch ((int) ELF32_R_TYPE (rela->r_info))
29c2fb7c
AJ		 2135 {
2136 case R_390_RELATIVE:
2137 return reloc_class_relative;
2138 case R_390_JMP_SLOT:
2139 return reloc_class_plt;
2140 case R_390_COPY:
2141 return reloc_class_copy;
2142 default:
2143 return reloc_class_normal;
2144 }
2145}
2146
a85d7ed0
NC		 2147#define TARGET_BIG_SYM bfd_elf32_s390_vec
2148#define TARGET_BIG_NAME "elf32-s390"
2149#define ELF_ARCH bfd_arch_s390
2150#define ELF_MACHINE_CODE EM_S390
2151#define ELF_MACHINE_ALT1 EM_S390_OLD
2152#define ELF_MAXPAGESIZE 0x1000
2153
2154#define elf_backend_can_gc_sections 1
51b64d56 2155#define elf_backend_can_refcount 1
a85d7ed0
NC		 2156#define elf_backend_want_got_plt 1
2157#define elf_backend_plt_readonly 1
2158#define elf_backend_want_plt_sym 0
2159#define elf_backend_got_header_size 12
2160#define elf_backend_plt_header_size PLT_ENTRY_SIZE
2161
2162#define elf_info_to_howto elf_s390_info_to_howto
2163
2164#define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link
2165#define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
2166#define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
2167#define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
2168
2169#define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
2170#define elf_backend_check_relocs elf_s390_check_relocs
2171#define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
2172#define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
2173#define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
2174#define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
2175#define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
2176#define elf_backend_relocate_section elf_s390_relocate_section
2177#define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
29c2fb7c 2178#define elf_backend_reloc_type_class elf_s390_reloc_type_class
a85d7ed0
NC		 2179
2180#define elf_backend_object_p elf_s390_object_p
2181
2182#include "elf32-target.h"
GDB Binutils - Deliverables
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