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2002-03-27 Michael Snyder <msnyder@redhat.com>
[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 *));
0451c93c
MS		 32static boolean elf_s390_is_local_label_name
33 PARAMS ((bfd *, const char *));
34static struct bfd_hash_entry *link_hash_newfunc
a85d7ed0
NC		 35 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
36static struct bfd_link_hash_table *elf_s390_link_hash_table_create
37 PARAMS ((bfd *));
0451c93c
MS		 38static boolean create_got_section
39 PARAMS((bfd *, struct bfd_link_info *));
40static boolean elf_s390_create_dynamic_sections
41 PARAMS((bfd *, struct bfd_link_info *));
42static void elf_s390_copy_indirect_symbol
43 PARAMS ((struct elf_link_hash_entry *, struct elf_link_hash_entry *));
a85d7ed0
NC		 44static boolean elf_s390_check_relocs
45 PARAMS ((bfd *, struct bfd_link_info *, asection *,
46 const Elf_Internal_Rela *));
5a65713f
AJ		 47static asection *elf_s390_gc_mark_hook
48 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
0451c93c 49 struct elf_link_hash_entry *, Elf_Internal_Sym *));
5a65713f
AJ		 50static boolean elf_s390_gc_sweep_hook
51 PARAMS ((bfd *, struct bfd_link_info *, asection *,
52 const Elf_Internal_Rela *));
a85d7ed0
NC		 53static boolean elf_s390_adjust_dynamic_symbol
54 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
0451c93c
MS		 55static boolean allocate_dynrelocs
56 PARAMS ((struct elf_link_hash_entry *, PTR));
57static boolean readonly_dynrelocs
58 PARAMS ((struct elf_link_hash_entry *, PTR));
a85d7ed0
NC		 59static boolean elf_s390_size_dynamic_sections
60 PARAMS ((bfd *, struct bfd_link_info *));
61static boolean elf_s390_relocate_section
62 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
63 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
64static boolean elf_s390_finish_dynamic_symbol
65 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
66 Elf_Internal_Sym *));
0451c93c
MS		 67static enum elf_reloc_type_class elf_s390_reloc_type_class
68 PARAMS ((const Elf_Internal_Rela *));
a85d7ed0
NC		 69static boolean elf_s390_finish_dynamic_sections
70 PARAMS ((bfd *, struct bfd_link_info *));
5a65713f 71static boolean elf_s390_object_p PARAMS ((bfd *));
248866a8 72static boolean elf_s390_grok_prstatus PARAMS ((bfd *, Elf_Internal_Note *));
a85d7ed0
NC		 73
74#define USE_RELA 1 /* We want RELA relocations, not REL. */
75
76#include "elf/s390.h"
77
78/* The relocation "howto" table. */
79
80static reloc_howto_type elf_howto_table[] =
81{
82 HOWTO (R_390_NONE, /* type */
83 0, /* rightshift */
84 0, /* size (0 = byte, 1 = short, 2 = long) */
85 0, /* bitsize */
86 false, /* pc_relative */
87 0, /* bitpos */
88 complain_overflow_dont, /* complain_on_overflow */
89 bfd_elf_generic_reloc, /* special_function */
90 "R_390_NONE", /* name */
91 false, /* partial_inplace */
92 0, /* src_mask */
93 0, /* dst_mask */
94 false), /* pcrel_offset */
95
96 HOWTO(R_390_8, 0, 0, 8, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false),
97 HOWTO(R_390_12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false),
98 HOWTO(R_390_16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false),
99 HOWTO(R_390_32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false),
100 HOWTO(R_390_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true),
101 HOWTO(R_390_GOT12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false),
102 HOWTO(R_390_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false),
103 HOWTO(R_390_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true),
104 HOWTO(R_390_COPY, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_COPY", false, 0,0xffffffff, false),
105 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),
106 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),
107 HOWTO(R_390_RELATIVE, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_RELATIVE",false, 0,0xffffffff, false),
108 HOWTO(R_390_GOTOFF, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTOFF", false, 0,0xffffffff, false),
109 HOWTO(R_390_GOTPC, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,0xffffffff, true),
110 HOWTO(R_390_GOT16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false),
111 HOWTO(R_390_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true),
112 HOWTO(R_390_PC16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true),
113 HOWTO(R_390_PLT16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true),
befc3abb
MS		 114 HOWTO(R_390_PC32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true),
115 HOWTO(R_390_PLT32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true),
116 HOWTO(R_390_GOTPCDBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPCDBL", false, 0,0xffffffff, true),
117 HOWTO(R_390_GOTENT, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTENT", false, 0,0xffffffff, true),
a85d7ed0
NC		 118};
119
120/* GNU extension to record C++ vtable hierarchy. */
121static reloc_howto_type elf32_s390_vtinherit_howto =
122 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false);
123static reloc_howto_type elf32_s390_vtentry_howto =
dc810e39 124 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		 125
126static reloc_howto_type *
127elf_s390_reloc_type_lookup (abfd, code)
128 bfd *abfd ATTRIBUTE_UNUSED;
129 bfd_reloc_code_real_type code;
130{
ec338859 131 switch (code)
0451c93c
MS		 132 {
133 case BFD_RELOC_NONE:
134 return &elf_howto_table[(int) R_390_NONE];
135 case BFD_RELOC_8:
136 return &elf_howto_table[(int) R_390_8];
137 case BFD_RELOC_390_12:
138 return &elf_howto_table[(int) R_390_12];
139 case BFD_RELOC_16:
140 return &elf_howto_table[(int) R_390_16];
141 case BFD_RELOC_32:
142 return &elf_howto_table[(int) R_390_32];
143 case BFD_RELOC_CTOR:
144 return &elf_howto_table[(int) R_390_32];
145 case BFD_RELOC_32_PCREL:
146 return &elf_howto_table[(int) R_390_PC32];
147 case BFD_RELOC_390_GOT12:
148 return &elf_howto_table[(int) R_390_GOT12];
149 case BFD_RELOC_32_GOT_PCREL:
150 return &elf_howto_table[(int) R_390_GOT32];
151 case BFD_RELOC_390_PLT32:
152 return &elf_howto_table[(int) R_390_PLT32];
153 case BFD_RELOC_390_COPY:
154 return &elf_howto_table[(int) R_390_COPY];
155 case BFD_RELOC_390_GLOB_DAT:
156 return &elf_howto_table[(int) R_390_GLOB_DAT];
157 case BFD_RELOC_390_JMP_SLOT:
158 return &elf_howto_table[(int) R_390_JMP_SLOT];
159 case BFD_RELOC_390_RELATIVE:
160 return &elf_howto_table[(int) R_390_RELATIVE];
161 case BFD_RELOC_32_GOTOFF:
162 return &elf_howto_table[(int) R_390_GOTOFF];
163 case BFD_RELOC_390_GOTPC:
164 return &elf_howto_table[(int) R_390_GOTPC];
165 case BFD_RELOC_390_GOT16:
166 return &elf_howto_table[(int) R_390_GOT16];
167 case BFD_RELOC_16_PCREL:
168 return &elf_howto_table[(int) R_390_PC16];
169 case BFD_RELOC_390_PC16DBL:
170 return &elf_howto_table[(int) R_390_PC16DBL];
171 case BFD_RELOC_390_PLT16DBL:
172 return &elf_howto_table[(int) R_390_PLT16DBL];
befc3abb
MS		 173 case BFD_RELOC_390_PC32DBL:
174 return &elf_howto_table[(int) R_390_PC32DBL];
175 case BFD_RELOC_390_PLT32DBL:
176 return &elf_howto_table[(int) R_390_PLT32DBL];
177 case BFD_RELOC_390_GOTPCDBL:
178 return &elf_howto_table[(int) R_390_GOTPCDBL];
179 case BFD_RELOC_390_GOTENT:
180 return &elf_howto_table[(int) R_390_GOTENT];
0451c93c
MS		 181 case BFD_RELOC_VTABLE_INHERIT:
182 return &elf32_s390_vtinherit_howto;
183 case BFD_RELOC_VTABLE_ENTRY:
184 return &elf32_s390_vtentry_howto;
185 default:
186 break;
187 }
a85d7ed0
NC		 188 return 0;
189}
190
191/* We need to use ELF32_R_TYPE so we have our own copy of this function,
192 and elf32-s390.c has its own copy. */
193
194static void
195elf_s390_info_to_howto (abfd, cache_ptr, dst)
196 bfd *abfd ATTRIBUTE_UNUSED;
197 arelent *cache_ptr;
198 Elf_Internal_Rela *dst;
199{
200 switch (ELF32_R_TYPE(dst->r_info))
201 {
202 case R_390_GNU_VTINHERIT:
203 cache_ptr->howto = &elf32_s390_vtinherit_howto;
204 break;
205
206 case R_390_GNU_VTENTRY:
207 cache_ptr->howto = &elf32_s390_vtentry_howto;
208 break;
209
210 default:
211 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_390_max);
212 cache_ptr->howto = &elf_howto_table[ELF32_R_TYPE(dst->r_info)];
dc810e39 213 }
a85d7ed0
NC		 214}
215
216static boolean
217elf_s390_is_local_label_name (abfd, name)
218 bfd *abfd;
219 const char *name;
220{
221 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
222 return true;
223
224 return _bfd_elf_is_local_label_name (abfd, name);
225}
226
227/* Functions for the 390 ELF linker. */
228
229/* The name of the dynamic interpreter. This is put in the .interp
230 section. */
231
232#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
233
a85d7ed0
NC		 234/* The size in bytes of the first entry in the procedure linkage table. */
235#define PLT_FIRST_ENTRY_SIZE 32
236/* The size in bytes of an entry in the procedure linkage table. */
dc810e39 237#define PLT_ENTRY_SIZE 32
a85d7ed0
NC		 238
239#define GOT_ENTRY_SIZE 4
240
241/* The first three entries in a procedure linkage table are reserved,
242 and the initial contents are unimportant (we zero them out).
243 Subsequent entries look like this. See the SVR4 ABI 386
244 supplement to see how this works. */
245
246/* For the s390, simple addr offset can only be 0 - 4096.
247 To use the full 2 GB address space, several instructions
248 are needed to load an address in a register and execute
249 a branch( or just saving the address)
250
dc810e39 251 Furthermore, only r 0 and 1 are free to use!!! */
a85d7ed0
NC		 252
253/* The first 3 words in the GOT are then reserved.
254 Word 0 is the address of the dynamic table.
255 Word 1 is a pointer to a structure describing the object
256 Word 2 is used to point to the loader entry address.
257
258 The code for position independand PLT entries looks like this:
259
260 r12 holds addr of the current GOT at entry to the PLT
261
262 The GOT holds the address in the PLT to be executed.
263 The loader then gets:
264 24(15) = Pointer to the structure describing the object.
dc810e39 265 28(15) = Offset in symbol table
a85d7ed0
NC		 266
267 The loader must then find the module where the function is
268 and insert the address in the GOT.
269
270 Note: 390 can only address +- 64 K relative.
271 We check if offset > 65536, then make a relative branch -64xxx
272 back to a previous defined branch
273
274PLT1: BASR 1,0 # 2 bytes
275 L 1,22(1) # 4 bytes Load offset in GOT in r 1
276 L 1,(1,12) # 4 bytes Load address from GOT in r1
277 BCR 15,1 # 2 bytes Jump to address
278RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
279 L 1,14(1) # 4 bytes Load offset in symol table in r1
280 BRC 15,-x # 4 bytes Jump to start of PLT
281 .word 0 # 2 bytes filler
282 .long ? # 4 bytes offset in GOT
283 .long ? # 4 bytes offset into symbol table
284
285 This was the general case. There are two additional, optimizes PLT
286 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768.
287 First the one for GOT offsets < 4096:
288
289PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1
290 BCR 15,1 # 2 bytes Jump to address
291 .word 0,0,0 # 6 bytes filler
292RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
293 L 1,14(1) # 4 bytes Load offset in symbol table in r1
294 BRC 15,-x # 4 bytes Jump to start of PLT
295 .word 0,0,0 # 6 bytes filler
296 .long ? # 4 bytes offset into symbol table
297
298 Second the one for GOT offsets < 32768:
299
300PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1
301 L 1,(1,12) # 4 bytes Load address from GOT to r1
302 BCR 15,1 # 2 bytes Jump to address
303 .word 0 # 2 bytes filler
304RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
305 L 1,14(1) # 4 bytes Load offset in symbol table in r1
306 BRC 15,-x # 4 bytes Jump to start of PLT
307 .word 0,0,0 # 6 bytes filler
308 .long ? # 4 bytes offset into symbol table
309
310Total = 32 bytes per PLT entry
311
312 The code for static build PLT entries looks like this:
313
314PLT1: BASR 1,0 # 2 bytes
315 L 1,22(1) # 4 bytes Load address of GOT entry
316 L 1,0(0,1) # 4 bytes Load address from GOT in r1
317 BCR 15,1 # 2 bytes Jump to address
318RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
319 L 1,14(1) # 4 bytes Load offset in symbol table in r1
320 BRC 15,-x # 4 bytes Jump to start of PLT
321 .word 0 # 2 bytes filler
322 .long ? # 4 bytes address of GOT entry
323 .long ? # 4 bytes offset into symbol table */
324
325#define PLT_PIC_ENTRY_WORD0 0x0d105810
326#define PLT_PIC_ENTRY_WORD1 0x10165811
327#define PLT_PIC_ENTRY_WORD2 0xc00007f1
328#define PLT_PIC_ENTRY_WORD3 0x0d105810
329#define PLT_PIC_ENTRY_WORD4 0x100ea7f4
330
331#define PLT_PIC12_ENTRY_WORD0 0x5810c000
332#define PLT_PIC12_ENTRY_WORD1 0x07f10000
333#define PLT_PIC12_ENTRY_WORD2 0x00000000
334#define PLT_PIC12_ENTRY_WORD3 0x0d105810
335#define PLT_PIC12_ENTRY_WORD4 0x100ea7f4
336
337#define PLT_PIC16_ENTRY_WORD0 0xa7180000
338#define PLT_PIC16_ENTRY_WORD1 0x5811c000
339#define PLT_PIC16_ENTRY_WORD2 0x07f10000
340#define PLT_PIC16_ENTRY_WORD3 0x0d105810
341#define PLT_PIC16_ENTRY_WORD4 0x100ea7f4
342
343#define PLT_ENTRY_WORD0 0x0d105810
344#define PLT_ENTRY_WORD1 0x10165810
345#define PLT_ENTRY_WORD2 0x100007f1
346#define PLT_ENTRY_WORD3 0x0d105810
347#define PLT_ENTRY_WORD4 0x100ea7f4
348
349/* The first PLT entry pushes the offset into the symbol table
350 from R1 onto the stack at 8(15) and the loader object info
351 at 12(15), loads the loader address in R1 and jumps to it. */
352
353/* The first entry in the PLT for PIC code:
354
355PLT0:
356 ST 1,28(15) # R1 has offset into symbol table
357 L 1,4(12) # Get loader ino(object struct address)
dc810e39 358 ST 1,24(15) # Store address
a85d7ed0
NC		 359 L 1,8(12) # Entry address of loader in R1
360 BR 1 # Jump to loader
361
362 The first entry in the PLT for static code:
363
364PLT0:
365 ST 1,28(15) # R1 has offset into symbol table
366 BASR 1,0
367 L 1,18(0,1) # Get address of GOT
368 MVC 24(4,15),4(1) # Move loader ino to stack
369 L 1,8(1) # Get address of loader
370 BR 1 # Jump to loader
371 .word 0 # filler
372 .long got # address of GOT */
373
374#define PLT_PIC_FIRST_ENTRY_WORD0 0x5010f01c
375#define PLT_PIC_FIRST_ENTRY_WORD1 0x5810c004
376#define PLT_PIC_FIRST_ENTRY_WORD2 0x5010f018
377#define PLT_PIC_FIRST_ENTRY_WORD3 0x5810c008
378#define PLT_PIC_FIRST_ENTRY_WORD4 0x07f10000
379
380#define PLT_FIRST_ENTRY_WORD0 0x5010f01c
381#define PLT_FIRST_ENTRY_WORD1 0x0d105810
382#define PLT_FIRST_ENTRY_WORD2 0x1012D203
383#define PLT_FIRST_ENTRY_WORD3 0xf0181004
384#define PLT_FIRST_ENTRY_WORD4 0x58101008
385#define PLT_FIRST_ENTRY_WORD5 0x07f10000
386
387/* The s390 linker needs to keep track of the number of relocs that it
0451c93c
MS		 388 decides to copy as dynamic relocs in check_relocs for each symbol.
389 This is so that it can later discard them if they are found to be
390 unnecessary. We store the information in a field extending the
391 regular ELF linker hash table. */
a85d7ed0 392
0451c93c 393struct elf_s390_dyn_relocs
a85d7ed0 394{
0451c93c
MS		 395 struct elf_s390_dyn_relocs *next;
396
397 /* The input section of the reloc. */
398 asection *sec;
399
400 /* Total number of relocs copied for the input section. */
a85d7ed0 401 bfd_size_type count;
0451c93c
MS		 402
403 /* Number of pc-relative relocs copied for the input section. */
404 bfd_size_type pc_count;
a85d7ed0
NC		 405};
406
407/* s390 ELF linker hash entry. */
408
409struct elf_s390_link_hash_entry
410{
0451c93c 411 struct elf_link_hash_entry elf;
a85d7ed0 412
0451c93c
MS		 413 /* Track dynamic relocs copied for this symbol. */
414 struct elf_s390_dyn_relocs *dyn_relocs;
a85d7ed0
NC		 415};
416
417/* s390 ELF linker hash table. */
418
419struct elf_s390_link_hash_table
420{
0451c93c 421 struct elf_link_hash_table elf;
a85d7ed0 422
0451c93c
MS		 423 /* Short-cuts to get to dynamic linker sections. */
424 asection *sgot;
425 asection *sgotplt;
426 asection *srelgot;
427 asection *splt;
428 asection *srelplt;
429 asection *sdynbss;
430 asection *srelbss;
ec338859
AM		 431
432 /* Small local sym to section mapping cache. */
433 struct sym_sec_cache sym_sec;
0451c93c 434};
a85d7ed0
NC		 435
436/* Get the s390 ELF linker hash table from a link_info structure. */
437
438#define elf_s390_hash_table(p) \
439 ((struct elf_s390_link_hash_table *) ((p)->hash))
440
441/* Create an entry in an s390 ELF linker hash table. */
442
443static struct bfd_hash_entry *
0451c93c 444link_hash_newfunc (entry, table, string)
a85d7ed0
NC		 445 struct bfd_hash_entry *entry;
446 struct bfd_hash_table *table;
447 const char *string;
448{
a85d7ed0
NC		 449 /* Allocate the structure if it has not already been allocated by a
450 subclass. */
0451c93c
MS		 451 if (entry == NULL)
452 {
453 entry = bfd_hash_allocate (table,
454 sizeof (struct elf_s390_link_hash_entry));
455 if (entry == NULL)
456 return entry;
457 }
ec338859 458
a85d7ed0 459 /* Call the allocation method of the superclass. */
0451c93c
MS		 460 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
461 if (entry != NULL)
a85d7ed0 462 {
0451c93c 463 struct elf_s390_link_hash_entry *eh;
ec338859 464
0451c93c
MS		 465 eh = (struct elf_s390_link_hash_entry *) entry;
466 eh->dyn_relocs = NULL;
a85d7ed0
NC		 467 }
468
0451c93c 469 return entry;
a85d7ed0
NC		 470}
471
472/* Create an s390 ELF linker hash table. */
473
474static struct bfd_link_hash_table *
475elf_s390_link_hash_table_create (abfd)
476 bfd *abfd;
477{
478 struct elf_s390_link_hash_table *ret;
dc810e39 479 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
a85d7ed0 480
dc810e39 481 ret = (struct elf_s390_link_hash_table *) bfd_alloc (abfd, amt);
0451c93c 482 if (ret == NULL)
a85d7ed0
NC		 483 return NULL;
484
0451c93c 485 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
a85d7ed0
NC		 486 {
487 bfd_release (abfd, ret);
488 return NULL;
489 }
490
0451c93c
MS		 491 ret->sgot = NULL;
492 ret->sgotplt = NULL;
493 ret->srelgot = NULL;
494 ret->splt = NULL;
495 ret->srelplt = NULL;
496 ret->sdynbss = NULL;
497 ret->srelbss = NULL;
ec338859 498 ret->sym_sec.abfd = NULL;
0451c93c
MS		 499
500 return &ret->elf.root;
501}
502
503/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
504 shortcuts to them in our hash table. */
505
506static boolean
507create_got_section (dynobj, info)
508 bfd *dynobj;
509 struct bfd_link_info *info;
510{
511 struct elf_s390_link_hash_table *htab;
512
513 if (! _bfd_elf_create_got_section (dynobj, info))
514 return false;
515
516 htab = elf_s390_hash_table (info);
517 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
518 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
519 if (!htab->sgot || !htab->sgotplt)
520 abort ();
521
522 htab->srelgot = bfd_make_section (dynobj, ".rela.got");
523 if (htab->srelgot == NULL
524 || ! bfd_set_section_flags (dynobj, htab->srelgot,
525 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
526 | SEC_IN_MEMORY | SEC_LINKER_CREATED
527 | SEC_READONLY))
528 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
529 return false;
530 return true;
531}
532
533/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
534 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
535 hash table. */
536
537static boolean
538elf_s390_create_dynamic_sections (dynobj, info)
539 bfd *dynobj;
540 struct bfd_link_info *info;
541{
542 struct elf_s390_link_hash_table *htab;
543
544 htab = elf_s390_hash_table (info);
545 if (!htab->sgot && !create_got_section (dynobj, info))
546 return false;
547
548 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
549 return false;
550
551 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
552 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
553 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
554 if (!info->shared)
555 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
556
557 if (!htab->splt || !htab->srelplt || !htab->sdynbss
558 || (!info->shared && !htab->srelbss))
559 abort ();
560
561 return true;
a85d7ed0
NC		 562}
563
0451c93c
MS		 564/* Copy the extra info we tack onto an elf_link_hash_entry. */
565
566static void
567elf_s390_copy_indirect_symbol (dir, ind)
568 struct elf_link_hash_entry *dir, *ind;
569{
570 struct elf_s390_link_hash_entry *edir, *eind;
571
572 edir = (struct elf_s390_link_hash_entry *) dir;
573 eind = (struct elf_s390_link_hash_entry *) ind;
574
575 if (eind->dyn_relocs != NULL)
576 {
577 if (edir->dyn_relocs != NULL)
578 {
579 struct elf_s390_dyn_relocs **pp;
580 struct elf_s390_dyn_relocs *p;
581
582 if (ind->root.type == bfd_link_hash_indirect)
583 abort ();
584
585 /* Add reloc counts against the weak sym to the strong sym
586 list. Merge any entries against the same section. */
587 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
588 {
589 struct elf_s390_dyn_relocs *q;
590
591 for (q = edir->dyn_relocs; q != NULL; q = q->next)
592 if (q->sec == p->sec)
593 {
594 q->pc_count += p->pc_count;
595 q->count += p->count;
596 *pp = p->next;
597 break;
598 }
599 if (q == NULL)
600 pp = &p->next;
601 }
602 *pp = edir->dyn_relocs;
603 }
604
605 edir->dyn_relocs = eind->dyn_relocs;
606 eind->dyn_relocs = NULL;
607 }
608
609 _bfd_elf_link_hash_copy_indirect (dir, ind);
610}
a85d7ed0
NC		 611
612/* Look through the relocs for a section during the first phase, and
613 allocate space in the global offset table or procedure linkage
614 table. */
615
616static boolean
617elf_s390_check_relocs (abfd, info, sec, relocs)
618 bfd *abfd;
619 struct bfd_link_info *info;
620 asection *sec;
621 const Elf_Internal_Rela *relocs;
622{
0451c93c 623 struct elf_s390_link_hash_table *htab;
a85d7ed0
NC		 624 Elf_Internal_Shdr *symtab_hdr;
625 struct elf_link_hash_entry **sym_hashes;
a85d7ed0
NC		 626 const Elf_Internal_Rela *rel;
627 const Elf_Internal_Rela *rel_end;
a85d7ed0
NC		 628 asection *sreloc;
629
630 if (info->relocateable)
631 return true;
632
0451c93c 633 htab = elf_s390_hash_table (info);
a85d7ed0
NC		 634 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
635 sym_hashes = elf_sym_hashes (abfd);
a85d7ed0 636
a85d7ed0
NC		 637 sreloc = NULL;
638
639 rel_end = relocs + sec->reloc_count;
640 for (rel = relocs; rel < rel_end; rel++)
641 {
642 unsigned long r_symndx;
643 struct elf_link_hash_entry *h;
644
645 r_symndx = ELF32_R_SYM (rel->r_info);
646
0451c93c
MS		 647 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
648 {
649 (*_bfd_error_handler) (_("%s: bad symbol index: %d"),
650 bfd_archive_filename (abfd),
651 r_symndx);
652 return false;
653 }
654
a85d7ed0
NC		 655 if (r_symndx < symtab_hdr->sh_info)
656 h = NULL;
657 else
dc810e39 658 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
a85d7ed0 659
a85d7ed0
NC		 660 switch (ELF32_R_TYPE (rel->r_info))
661 {
662 case R_390_GOT12:
663 case R_390_GOT16:
664 case R_390_GOT32:
befc3abb 665 case R_390_GOTENT:
a85d7ed0 666 /* This symbol requires a global offset table entry. */
a85d7ed0
NC		 667 if (h != NULL)
668 {
51b64d56 669 h->got.refcount += 1;
a85d7ed0
NC		 670 }
671 else
672 {
0451c93c
MS		 673 bfd_signed_vma *local_got_refcounts;
674
a85d7ed0 675 /* This is a global offset table entry for a local symbol. */
0451c93c 676 local_got_refcounts = elf_local_got_refcounts (abfd);
a85d7ed0
NC		 677 if (local_got_refcounts == NULL)
678 {
dc810e39 679 bfd_size_type size;
a85d7ed0 680
dc810e39
AM		 681 size = symtab_hdr->sh_info;
682 size *= sizeof (bfd_signed_vma);
0451c93c
MS		 683 local_got_refcounts = ((bfd_signed_vma *)
684 bfd_zalloc (abfd, size));
a85d7ed0
NC		 685 if (local_got_refcounts == NULL)
686 return false;
687 elf_local_got_refcounts (abfd) = local_got_refcounts;
a85d7ed0 688 }
51b64d56 689 local_got_refcounts[r_symndx] += 1;
a85d7ed0 690 }
0451c93c
MS		 691 /* Fall through */
692
693 case R_390_GOTOFF:
694 case R_390_GOTPC:
befc3abb 695 case R_390_GOTPCDBL:
0451c93c
MS		 696 if (htab->sgot == NULL)
697 {
698 if (htab->elf.dynobj == NULL)
699 htab->elf.dynobj = abfd;
700 if (!create_got_section (htab->elf.dynobj, info))
701 return false;
702 }
a85d7ed0
NC		 703 break;
704
705 case R_390_PLT16DBL:
befc3abb 706 case R_390_PLT32DBL:
a85d7ed0
NC		 707 case R_390_PLT32:
708 /* This symbol requires a procedure linkage table entry. We
709 actually build the entry in adjust_dynamic_symbol,
710 because this might be a case of linking PIC code which is
711 never referenced by a dynamic object, in which case we
712 don't need to generate a procedure linkage table entry
713 after all. */
714
715 /* If this is a local symbol, we resolve it directly without
716 creating a procedure linkage table entry. */
717 if (h == NULL)
718 continue;
719
51b64d56
AM		 720 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
721 h->plt.refcount += 1;
a85d7ed0
NC		 722 break;
723
724 case R_390_8:
725 case R_390_16:
726 case R_390_32:
727 case R_390_PC16:
728 case R_390_PC16DBL:
befc3abb 729 case R_390_PC32DBL:
a85d7ed0 730 case R_390_PC32:
0451c93c
MS		 731 if (h != NULL && !info->shared)
732 {
733 /* If this reloc is in a read-only section, we might
734 need a copy reloc. We can't check reliably at this
735 stage whether the section is read-only, as input
736 sections have not yet been mapped to output sections.
737 Tentatively set the flag for now, and correct in
738 adjust_dynamic_symbol. */
739 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
ec338859 740
0451c93c
MS		 741 /* We may need a .plt entry if the function this reloc
742 refers to is in a shared lib. */
743 h->plt.refcount += 1;
744 }
a85d7ed0
NC		 745
746 /* If we are creating a shared library, and this is a reloc
0451c93c
MS		 747 against a global symbol, or a non PC relative reloc
748 against a local symbol, then we need to copy the reloc
749 into the shared library. However, if we are linking with
750 -Bsymbolic, we do not need to copy a reloc against a
751 global symbol which is defined in an object we are
752 including in the link (i.e., DEF_REGULAR is set). At
753 this point we have not seen all the input files, so it is
754 possible that DEF_REGULAR is not set now but will be set
755 later (it is never cleared). In case of a weak definition,
756 DEF_REGULAR may be cleared later by a strong definition in
757 a shared library. We account for that possibility below by
758 storing information in the relocs_copied field of the hash
759 table entry. A similar situation occurs when creating
760 shared libraries and symbol visibility changes render the
761 symbol local.
762
763 If on the other hand, we are creating an executable, we
764 may need to keep relocations for symbols satisfied by a
765 dynamic library if we manage to avoid copy relocs for the
766 symbol. */
767 if ((info->shared
768 && (sec->flags & SEC_ALLOC) != 0
ec338859 769 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16
0451c93c 770 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL
befc3abb 771 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL
0451c93c
MS		 772 && ELF32_R_TYPE (rel->r_info) != R_390_PC32)
773 || (h != NULL
774 && (! info->symbolic
775 || h->root.type == bfd_link_hash_defweak
776 || (h->elf_link_hash_flags
777 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
778 || (!info->shared
779 && (sec->flags & SEC_ALLOC) != 0
780 && h != NULL
781 && (h->root.type == bfd_link_hash_defweak
782 || (h->elf_link_hash_flags
783 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
a85d7ed0 784 {
ec338859
AM		 785 struct elf_s390_dyn_relocs *p;
786 struct elf_s390_dyn_relocs **head;
787
0451c93c
MS		 788 /* We must copy these reloc types into the output file.
789 Create a reloc section in dynobj and make room for
790 this reloc. */
a85d7ed0
NC		 791 if (sreloc == NULL)
792 {
793 const char *name;
0451c93c 794 bfd *dynobj;
ec338859 795
a85d7ed0
NC		 796 name = (bfd_elf_string_from_elf_section
797 (abfd,
798 elf_elfheader (abfd)->e_shstrndx,
799 elf_section_data (sec)->rel_hdr.sh_name));
800 if (name == NULL)
801 return false;
802
0451c93c
MS		 803 if (strncmp (name, ".rela", 5) != 0
804 || strcmp (bfd_get_section_name (abfd, sec),
805 name + 5) != 0)
806 {
807 (*_bfd_error_handler)
808 (_("%s: bad relocation section name `%s\'"),
809 bfd_archive_filename (abfd), name);
810 }
811
812 if (htab->elf.dynobj == NULL)
813 htab->elf.dynobj = abfd;
a85d7ed0 814
0451c93c 815 dynobj = htab->elf.dynobj;
a85d7ed0
NC		 816 sreloc = bfd_get_section_by_name (dynobj, name);
817 if (sreloc == NULL)
818 {
819 flagword flags;
820
821 sreloc = bfd_make_section (dynobj, name);
822 flags = (SEC_HAS_CONTENTS | SEC_READONLY
823 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
824 if ((sec->flags & SEC_ALLOC) != 0)
825 flags |= SEC_ALLOC | SEC_LOAD;
826 if (sreloc == NULL
827 || ! bfd_set_section_flags (dynobj, sreloc, flags)
828 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
829 return false;
830 }
0451c93c 831 elf_section_data (sec)->sreloc = sreloc;
a85d7ed0
NC		 832 }
833
0451c93c
MS		 834 /* If this is a global symbol, we count the number of
835 relocations we need for this symbol. */
836 if (h != NULL)
a85d7ed0 837 {
ec338859 838 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
0451c93c
MS		 839 }
840 else
841 {
ec338859
AM		 842 /* Track dynamic relocs needed for local syms too.
843 We really need local syms available to do this
844 easily. Oh well. */
845
846 asection *s;
847 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
848 sec, r_symndx);
849 if (s == NULL)
850 return false;
851
852 head = ((struct elf_s390_dyn_relocs **)
853 &elf_section_data (s)->local_dynrel);
854 }
855
856 p = *head;
857 if (p == NULL || p->sec != sec)
858 {
859 bfd_size_type amt = sizeof *p;
860 p = ((struct elf_s390_dyn_relocs *)
861 bfd_alloc (htab->elf.dynobj, amt));
862 if (p == NULL)
863 return false;
864 p->next = *head;
865 *head = p;
866 p->sec = sec;
867 p->count = 0;
868 p->pc_count = 0;
a85d7ed0 869 }
ec338859
AM		 870
871 p->count += 1;
872 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
873 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
befc3abb 874 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
ec338859
AM		 875 || ELF32_R_TYPE (rel->r_info) == R_390_PC32)
876 p->pc_count += 1;
a85d7ed0 877 }
a85d7ed0 878 break;
ec338859 879
a85d7ed0
NC		 880 /* This relocation describes the C++ object vtable hierarchy.
881 Reconstruct it for later use during GC. */
882 case R_390_GNU_VTINHERIT:
883 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
884 return false;
885 break;
ec338859 886
a85d7ed0
NC		 887 /* This relocation describes which C++ vtable entries are actually
888 used. Record for later use during GC. */
889 case R_390_GNU_VTENTRY:
db727808 890 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
a85d7ed0
NC		 891 return false;
892 break;
ec338859 893
a85d7ed0
NC		 894 default:
895 break;
896 }
897 }
898
899 return true;
900}
901
902/* Return the section that should be marked against GC for a given
903 relocation. */
904
905static asection *
906elf_s390_gc_mark_hook (abfd, info, rel, h, sym)
907 bfd *abfd;
908 struct bfd_link_info *info ATTRIBUTE_UNUSED;
909 Elf_Internal_Rela *rel;
910 struct elf_link_hash_entry *h;
911 Elf_Internal_Sym *sym;
912{
913 if (h != NULL)
914 {
915 switch (ELF32_R_TYPE (rel->r_info))
916 {
917 case R_390_GNU_VTINHERIT:
918 case R_390_GNU_VTENTRY:
919 break;
920
921 default:
922 switch (h->root.type)
923 {
924 case bfd_link_hash_defined:
925 case bfd_link_hash_defweak:
926 return h->root.u.def.section;
927
928 case bfd_link_hash_common:
929 return h->root.u.c.p->section;
930
931 default:
932 break;
933 }
934 }
935 }
936 else
937 {
9ad5cbcf 938 return bfd_section_from_elf_index (abfd, sym->st_shndx);
a85d7ed0
NC		 939 }
940
941 return NULL;
942}
943
944/* Update the got entry reference counts for the section being removed. */
945
946static boolean
947elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
0451c93c
MS		 948 bfd *abfd;
949 struct bfd_link_info *info;
950 asection *sec;
951 const Elf_Internal_Rela *relocs;
a85d7ed0
NC		 952{
953 Elf_Internal_Shdr *symtab_hdr;
954 struct elf_link_hash_entry **sym_hashes;
955 bfd_signed_vma *local_got_refcounts;
956 const Elf_Internal_Rela *rel, *relend;
957 unsigned long r_symndx;
958 struct elf_link_hash_entry *h;
a85d7ed0 959
ec338859 960 elf_section_data (sec)->local_dynrel = NULL;
a85d7ed0 961
0451c93c
MS		 962 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
963 sym_hashes = elf_sym_hashes (abfd);
964 local_got_refcounts = elf_local_got_refcounts (abfd);
a85d7ed0
NC		 965
966 relend = relocs + sec->reloc_count;
967 for (rel = relocs; rel < relend; rel++)
968 switch (ELF32_R_TYPE (rel->r_info))
969 {
970 case R_390_GOT12:
971 case R_390_GOT16:
972 case R_390_GOT32:
973 case R_390_GOTOFF:
974 case R_390_GOTPC:
befc3abb
MS		 975 case R_390_GOTPCDBL:
976 case R_390_GOTENT:
a85d7ed0
NC		 977 r_symndx = ELF32_R_SYM (rel->r_info);
978 if (r_symndx >= symtab_hdr->sh_info)
979 {
980 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
981 if (h->got.refcount > 0)
0451c93c 982 h->got.refcount -= 1;
a85d7ed0
NC		 983 }
984 else if (local_got_refcounts != NULL)
985 {
986 if (local_got_refcounts[r_symndx] > 0)
0451c93c
MS		 987 local_got_refcounts[r_symndx] -= 1;
988 }
989 break;
990
991 case R_390_8:
992 case R_390_12:
993 case R_390_16:
994 case R_390_32:
995 case R_390_PC16:
996 case R_390_PC16DBL:
befc3abb 997 case R_390_PC32DBL:
0451c93c
MS		 998 case R_390_PC32:
999 r_symndx = ELF32_R_SYM (rel->r_info);
1000 if (r_symndx >= symtab_hdr->sh_info)
1001 {
1002 struct elf_s390_link_hash_entry *eh;
1003 struct elf_s390_dyn_relocs **pp;
1004 struct elf_s390_dyn_relocs *p;
1005
1006 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1007
1008 if (!info->shared && h->plt.refcount > 0)
1009 h->plt.refcount -= 1;
1010
1011 eh = (struct elf_s390_link_hash_entry *) h;
1012
1013 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1014 if (p->sec == sec)
1015 {
1016 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
1017 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
befc3abb 1018 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
0451c93c
MS		 1019 || ELF32_R_TYPE (rel->r_info) == R_390_PC32)
1020 p->pc_count -= 1;
1021 p->count -= 1;
1022 if (p->count == 0)
1023 *pp = p->next;
1024 break;
1025 }
a85d7ed0
NC		 1026 }
1027 break;
1028
1029 case R_390_PLT16DBL:
befc3abb 1030 case R_390_PLT32DBL:
a85d7ed0
NC		 1031 case R_390_PLT32:
1032 r_symndx = ELF32_R_SYM (rel->r_info);
1033 if (r_symndx >= symtab_hdr->sh_info)
1034 {
1035 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1036 if (h->plt.refcount > 0)
1037 h->plt.refcount -= 1;
1038 }
1039 break;
1040
1041 default:
1042 break;
1043 }
1044
1045 return true;
1046}
1047
1048/* Adjust a symbol defined by a dynamic object and referenced by a
1049 regular object. The current definition is in some section of the
1050 dynamic object, but we're not including those sections. We have to
1051 change the definition to something the rest of the link can
1052 understand. */
1053
1054static boolean
1055elf_s390_adjust_dynamic_symbol (info, h)
1056 struct bfd_link_info *info;
1057 struct elf_link_hash_entry *h;
1058{
0451c93c
MS		 1059 struct elf_s390_link_hash_table *htab;
1060 struct elf_s390_link_hash_entry * eh;
1061 struct elf_s390_dyn_relocs *p;
a85d7ed0
NC		 1062 asection *s;
1063 unsigned int power_of_two;
1064
a85d7ed0
NC		 1065 /* If this is a function, put it in the procedure linkage table. We
1066 will fill in the contents of the procedure linkage table later
1067 (although we could actually do it here). */
1068 if (h->type == STT_FUNC
1069 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
1070 {
0451c93c
MS		 1071 if (h->plt.refcount <= 0
1072 || (! info->shared
1073 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
f9cd9119
MS		 1074 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
1075 && h->root.type != bfd_link_hash_undefweak
1076 && h->root.type != bfd_link_hash_undefined))
a85d7ed0
NC		 1077 {
1078 /* This case can occur if we saw a PLT32 reloc in an input
1079 file, but the symbol was never referred to by a dynamic
1080 object, or if all references were garbage collected. In
1081 such a case, we don't actually need to build a procedure
1082 linkage table, and we can just do a PC32 reloc instead. */
1083 h->plt.offset = (bfd_vma) -1;
1084 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
a85d7ed0
NC		 1085 }
1086
a85d7ed0
NC		 1087 return true;
1088 }
bbd7ec4a 1089 else
0451c93c
MS		 1090 /* It's possible that we incorrectly decided a .plt reloc was
1091 needed for an R_390_PC32 reloc to a non-function sym in
1092 check_relocs. We can't decide accurately between function and
1093 non-function syms in check-relocs; Objects loaded later in
1094 the link may change h->type. So fix it now. */
bbd7ec4a 1095 h->plt.offset = (bfd_vma) -1;
a85d7ed0
NC		 1096
1097 /* If this is a weak symbol, and there is a real definition, the
1098 processor independent code will have arranged for us to see the
1099 real definition first, and we can just use the same value. */
1100 if (h->weakdef != NULL)
1101 {
1102 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1103 || h->weakdef->root.type == bfd_link_hash_defweak);
1104 h->root.u.def.section = h->weakdef->root.u.def.section;
1105 h->root.u.def.value = h->weakdef->root.u.def.value;
1106 return true;
1107 }
1108
1109 /* This is a reference to a symbol defined by a dynamic object which
1110 is not a function. */
1111
1112 /* If we are creating a shared library, we must presume that the
1113 only references to the symbol are via the global offset table.
1114 For such cases we need not do anything here; the relocations will
1115 be handled correctly by relocate_section. */
1116 if (info->shared)
1117 return true;
1118
1119 /* If there are no references to this symbol that do not use the
1120 GOT, we don't need to generate a copy reloc. */
1121 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1122 return true;
1123
0451c93c
MS		 1124 /* If -z nocopyreloc was given, we won't generate them either. */
1125 if (info->nocopyreloc)
1126 {
1127 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1128 return true;
1129 }
1130
1131 eh = (struct elf_s390_link_hash_entry *) h;
1132 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1133 {
1134 s = p->sec->output_section;
1135 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1136 break;
1137 }
1138
1139 /* If we didn't find any dynamic relocs in read-only sections, then
ec338859 1140 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
0451c93c
MS		 1141 if (p == NULL)
1142 {
1143 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1144 return true;
1145 }
1146
a85d7ed0
NC		 1147 /* We must allocate the symbol in our .dynbss section, which will
1148 become part of the .bss section of the executable. There will be
1149 an entry for this symbol in the .dynsym section. The dynamic
1150 object will contain position independent code, so all references
1151 from the dynamic object to this symbol will go through the global
1152 offset table. The dynamic linker will use the .dynsym entry to
1153 determine the address it must put in the global offset table, so
1154 both the dynamic object and the regular object will refer to the
1155 same memory location for the variable. */
1156
0451c93c 1157 htab = elf_s390_hash_table (info);
a85d7ed0 1158
0451c93c
MS		 1159 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1160 copy the initial value out of the dynamic object and into the
1161 runtime process image. */
a85d7ed0
NC		 1162 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1163 {
0451c93c 1164 htab->srelbss->_raw_size += sizeof (Elf32_External_Rela);
a85d7ed0
NC		 1165 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1166 }
1167
1168 /* We need to figure out the alignment required for this symbol. I
1169 have no idea how ELF linkers handle this. */
1170 power_of_two = bfd_log2 (h->size);
1171 if (power_of_two > 3)
1172 power_of_two = 3;
1173
1174 /* Apply the required alignment. */
0451c93c
MS		 1175 s = htab->sdynbss;
1176 s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
1177 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
a85d7ed0 1178 {
0451c93c 1179 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
a85d7ed0
NC		 1180 return false;
1181 }
1182
1183 /* Define the symbol as being at this point in the section. */
1184 h->root.u.def.section = s;
1185 h->root.u.def.value = s->_raw_size;
1186
1187 /* Increment the section size to make room for the symbol. */
1188 s->_raw_size += h->size;
1189
1190 return true;
1191}
1192
0451c93c
MS		 1193/* This is the condition under which elf_s390_finish_dynamic_symbol
1194 will be called from elflink.h. If elflink.h doesn't call our
1195 finish_dynamic_symbol routine, we'll need to do something about
1196 initializing any .plt and .got entries in elf_s390_relocate_section. */
1197#define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \
1198 ((DYN) \
1199 && ((INFO)->shared \
1200 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1201 && ((H)->dynindx != -1 \
1202 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1203
1204/* Allocate space in .plt, .got and associated reloc sections for
1205 dynamic relocs. */
1206
1207static boolean
1208allocate_dynrelocs (h, inf)
1209 struct elf_link_hash_entry *h;
1210 PTR inf;
1211{
1212 struct bfd_link_info *info;
1213 struct elf_s390_link_hash_table *htab;
1214 struct elf_s390_link_hash_entry *eh;
1215 struct elf_s390_dyn_relocs *p;
1216
1217 if (h->root.type == bfd_link_hash_indirect
1218 || h->root.type == bfd_link_hash_warning)
1219 return true;
1220
1221 info = (struct bfd_link_info *) inf;
1222 htab = elf_s390_hash_table (info);
1223
1224 if (htab->elf.dynamic_sections_created
1225 && h->plt.refcount > 0)
1226 {
1227 /* Make sure this symbol is output as a dynamic symbol.
1228 Undefined weak syms won't yet be marked as dynamic. */
1229 if (h->dynindx == -1
1230 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1231 {
1232 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1233 return false;
1234 }
1235
1236 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h))
1237 {
1238 asection *s = htab->splt;
1239
1240 /* If this is the first .plt entry, make room for the special
1241 first entry. */
1242 if (s->_raw_size == 0)
1243 s->_raw_size += PLT_FIRST_ENTRY_SIZE;
1244
1245 h->plt.offset = s->_raw_size;
1246
1247 /* If this symbol is not defined in a regular file, and we are
1248 not generating a shared library, then set the symbol to this
1249 location in the .plt. This is required to make function
1250 pointers compare as equal between the normal executable and
1251 the shared library. */
1252 if (! info->shared
1253 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1254 {
1255 h->root.u.def.section = s;
1256 h->root.u.def.value = h->plt.offset;
1257 }
ec338859 1258
0451c93c
MS		 1259 /* Make room for this entry. */
1260 s->_raw_size += PLT_ENTRY_SIZE;
ec338859 1261
0451c93c
MS		 1262 /* We also need to make an entry in the .got.plt section, which
1263 will be placed in the .got section by the linker script. */
1264 htab->sgotplt->_raw_size += GOT_ENTRY_SIZE;
1265
1266 /* We also need to make an entry in the .rela.plt section. */
1267 htab->srelplt->_raw_size += sizeof (Elf32_External_Rela);
1268 }
1269 else
1270 {
1271 h->plt.offset = (bfd_vma) -1;
1272 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1273 }
ec338859 1274 }
0451c93c
MS		 1275 else
1276 {
1277 h->plt.offset = (bfd_vma) -1;
1278 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
ec338859
AM		 1279 }
1280
0451c93c
MS		 1281 if (h->got.refcount > 0)
1282 {
1283 asection *s;
1284 boolean dyn;
1285
1286 /* Make sure this symbol is output as a dynamic symbol.
1287 Undefined weak syms won't yet be marked as dynamic. */
1288 if (h->dynindx == -1
1289 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1290 {
1291 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1292 return false;
1293 }
1294
1295 s = htab->sgot;
1296 h->got.offset = s->_raw_size;
1297 s->_raw_size += GOT_ENTRY_SIZE;
1298 dyn = htab->elf.dynamic_sections_created;
1299 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h))
1300 htab->srelgot->_raw_size += sizeof (Elf32_External_Rela);
1301 }
1302 else
1303 h->got.offset = (bfd_vma) -1;
1304
1305 eh = (struct elf_s390_link_hash_entry *) h;
1306 if (eh->dyn_relocs == NULL)
1307 return true;
1308
1309 /* In the shared -Bsymbolic case, discard space allocated for
1310 dynamic pc-relative relocs against symbols which turn out to be
1311 defined in regular objects. For the normal shared case, discard
1312 space for pc-relative relocs that have become local due to symbol
1313 visibility changes. */
1314
1315 if (info->shared)
1316 {
1317 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1318 && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
1319 || info->symbolic))
1320 {
1321 struct elf_s390_dyn_relocs **pp;
1322
1323 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1324 {
1325 p->count -= p->pc_count;
1326 p->pc_count = 0;
1327 if (p->count == 0)
1328 *pp = p->next;
1329 else
1330 pp = &p->next;
1331 }
1332 }
1333 }
1334 else
1335 {
1336 /* For the non-shared case, discard space for relocs against
1337 symbols which turn out to need copy relocs or are not
1338 dynamic. */
1339
1340 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1341 && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1342 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1343 || (htab->elf.dynamic_sections_created
1344 && (h->root.type == bfd_link_hash_undefweak
1345 || h->root.type == bfd_link_hash_undefined))))
1346 {
1347 /* Make sure this symbol is output as a dynamic symbol.
1348 Undefined weak syms won't yet be marked as dynamic. */
1349 if (h->dynindx == -1
1350 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1351 {
1352 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1353 return false;
1354 }
1355
1356 /* If that succeeded, we know we'll be keeping all the
1357 relocs. */
1358 if (h->dynindx != -1)
1359 goto keep;
1360 }
1361
1362 eh->dyn_relocs = NULL;
1363
ec338859 1364 keep: ;
0451c93c
MS		 1365 }
1366
1367 /* Finally, allocate space. */
1368 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1369 {
1370 asection *sreloc = elf_section_data (p->sec)->sreloc;
1371 sreloc->_raw_size += p->count * sizeof (Elf32_External_Rela);
1372 }
1373
1374 return true;
1375}
1376
1377/* Find any dynamic relocs that apply to read-only sections. */
1378
1379static boolean
1380readonly_dynrelocs (h, inf)
1381 struct elf_link_hash_entry *h;
1382 PTR inf;
1383{
1384 struct elf_s390_link_hash_entry *eh;
1385 struct elf_s390_dyn_relocs *p;
1386
1387 eh = (struct elf_s390_link_hash_entry *) h;
1388 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1389 {
1390 asection *s = p->sec->output_section;
1391
1392 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1393 {
1394 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1395
1396 info->flags |= DF_TEXTREL;
1397
1398 /* Not an error, just cut short the traversal. */
1399 return false;
1400 }
1401 }
1402 return true;
1403}
1404
a85d7ed0
NC		 1405/* Set the sizes of the dynamic sections. */
1406
1407static boolean
1408elf_s390_size_dynamic_sections (output_bfd, info)
29c2fb7c 1409 bfd *output_bfd ATTRIBUTE_UNUSED;
a85d7ed0
NC		 1410 struct bfd_link_info *info;
1411{
0451c93c 1412 struct elf_s390_link_hash_table *htab;
a85d7ed0
NC		 1413 bfd *dynobj;
1414 asection *s;
a85d7ed0 1415 boolean relocs;
0451c93c 1416 bfd *ibfd;
a85d7ed0 1417
0451c93c
MS		 1418 htab = elf_s390_hash_table (info);
1419 dynobj = htab->elf.dynobj;
1420 if (dynobj == NULL)
1421 abort ();
a85d7ed0 1422
0451c93c 1423 if (htab->elf.dynamic_sections_created)
a85d7ed0
NC		 1424 {
1425 /* Set the contents of the .interp section to the interpreter. */
1426 if (! info->shared)
1427 {
1428 s = bfd_get_section_by_name (dynobj, ".interp");
0451c93c
MS		 1429 if (s == NULL)
1430 abort ();
a85d7ed0
NC		 1431 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1432 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1433 }
1434 }
a85d7ed0 1435
0451c93c
MS		 1436 /* Set up .got offsets for local syms, and space for local dynamic
1437 relocs. */
1438 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
a85d7ed0 1439 {
0451c93c
MS		 1440 bfd_signed_vma *local_got;
1441 bfd_signed_vma *end_local_got;
1442 bfd_size_type locsymcount;
1443 Elf_Internal_Shdr *symtab_hdr;
1444 asection *srela;
a85d7ed0 1445
0451c93c 1446 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
a85d7ed0
NC		 1447 continue;
1448
0451c93c 1449 for (s = ibfd->sections; s != NULL; s = s->next)
a85d7ed0 1450 {
ec338859 1451 struct elf_s390_dyn_relocs *p;
0451c93c 1452
ec338859
AM		 1453 for (p = *((struct elf_s390_dyn_relocs **)
1454 &elf_section_data (s)->local_dynrel);
1455 p != NULL;
1456 p = p->next)
a85d7ed0 1457 {
ec338859
AM		 1458 if (!bfd_is_abs_section (p->sec)
1459 && bfd_is_abs_section (p->sec->output_section))
1460 {
1461 /* Input section has been discarded, either because
1462 it is a copy of a linkonce section or due to
1463 linker script /DISCARD/, so we'll be discarding
1464 the relocs too. */
1465 }
248866a8 1466 else if (p->count != 0)
ec338859
AM		 1467 {
1468 srela = elf_section_data (p->sec)->sreloc;
1469 srela->_raw_size += p->count * sizeof (Elf32_External_Rela);
248866a8
AM		 1470 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1471 info->flags |= DF_TEXTREL;
ec338859 1472 }
a85d7ed0
NC		 1473 }
1474 }
0451c93c
MS		 1475
1476 local_got = elf_local_got_refcounts (ibfd);
1477 if (!local_got)
1478 continue;
1479
1480 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1481 locsymcount = symtab_hdr->sh_info;
1482 end_local_got = local_got + locsymcount;
1483 s = htab->sgot;
1484 srela = htab->srelgot;
1485 for (; local_got < end_local_got; ++local_got)
a85d7ed0 1486 {
0451c93c 1487 if (*local_got > 0)
a85d7ed0 1488 {
0451c93c
MS		 1489 *local_got = s->_raw_size;
1490 s->_raw_size += GOT_ENTRY_SIZE;
1491 if (info->shared)
1492 srela->_raw_size += sizeof (Elf32_External_Rela);
a85d7ed0
NC		 1493 }
1494 else
0451c93c
MS		 1495 *local_got = (bfd_vma) -1;
1496 }
1497 }
1498
1499 /* Allocate global sym .plt and .got entries, and space for global
1500 sym dynamic relocs. */
1501 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1502
1503 /* We now have determined the sizes of the various dynamic sections.
1504 Allocate memory for them. */
1505 relocs = false;
1506 for (s = dynobj->sections; s != NULL; s = s->next)
1507 {
1508 if ((s->flags & SEC_LINKER_CREATED) == 0)
1509 continue;
1510
1511 if (s == htab->splt
1512 || s == htab->sgot
1513 || s == htab->sgotplt)
1514 {
1515 /* Strip this section if we don't need it; see the
1516 comment below. */
a85d7ed0 1517 }
0451c93c
MS		 1518 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
1519 {
1520 if (s->_raw_size != 0 && s != htab->srelplt)
1521 relocs = true;
ec338859 1522
0451c93c
MS		 1523 /* We use the reloc_count field as a counter if we need
1524 to copy relocs into the output file. */
1525 s->reloc_count = 0;
1526 }
1527 else
a85d7ed0
NC		 1528 {
1529 /* It's not one of our sections, so don't allocate space. */
1530 continue;
1531 }
1532
0451c93c 1533 if (s->_raw_size == 0)
a85d7ed0 1534 {
0451c93c
MS		 1535 /* If we don't need this section, strip it from the
1536 output file. This is to handle .rela.bss and
1537 .rela.plt. We must create it in
1538 create_dynamic_sections, because it must be created
1539 before the linker maps input sections to output
1540 sections. The linker does that before
1541 adjust_dynamic_symbol is called, and it is that
1542 function which decides whether anything needs to go
1543 into these sections. */
1544
a85d7ed0
NC		 1545 _bfd_strip_section_from_output (info, s);
1546 continue;
1547 }
1548
0451c93c
MS		 1549 /* Allocate memory for the section contents. We use bfd_zalloc
1550 here in case unused entries are not reclaimed before the
1551 section's contents are written out. This should not happen,
1552 but this way if it does, we get a R_390_NONE reloc instead
1553 of garbage. */
1554 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1555 if (s->contents == NULL)
a85d7ed0
NC		 1556 return false;
1557 }
ec338859 1558
0451c93c 1559 if (htab->elf.dynamic_sections_created)
a85d7ed0
NC		 1560 {
1561 /* Add some entries to the .dynamic section. We fill in the
1562 values later, in elf_s390_finish_dynamic_sections, but we
1563 must add the entries now so that we get the correct size for
1564 the .dynamic section. The DT_DEBUG entry is filled in by the
1565 dynamic linker and used by the debugger. */
dc810e39
AM		 1566#define add_dynamic_entry(TAG, VAL) \
1567 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
ec338859 1568
a85d7ed0
NC		 1569 if (! info->shared)
1570 {
dc810e39 1571 if (!add_dynamic_entry (DT_DEBUG, 0))
a85d7ed0
NC		 1572 return false;
1573 }
ec338859 1574
0451c93c 1575 if (htab->splt->_raw_size != 0)
a85d7ed0 1576 {
dc810e39
AM		 1577 if (!add_dynamic_entry (DT_PLTGOT, 0)
1578 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1579 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1580 || !add_dynamic_entry (DT_JMPREL, 0))
a85d7ed0
NC		 1581 return false;
1582 }
ec338859 1583
a85d7ed0
NC		 1584 if (relocs)
1585 {
dc810e39
AM		 1586 if (!add_dynamic_entry (DT_RELA, 0)
1587 || !add_dynamic_entry (DT_RELASZ, 0)
1588 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
a85d7ed0 1589 return false;
a85d7ed0 1590
0451c93c
MS		 1591 /* If any dynamic relocs apply to a read-only section,
1592 then we need a DT_TEXTREL entry. */
248866a8
AM		 1593 if ((info->flags & DF_TEXTREL) == 0)
1594 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
1595 (PTR) info);
ec338859 1596
0451c93c
MS		 1597 if ((info->flags & DF_TEXTREL) != 0)
1598 {
1599 if (!add_dynamic_entry (DT_TEXTREL, 0))
1600 return false;
1601 }
a85d7ed0
NC		 1602 }
1603 }
dc810e39 1604#undef add_dynamic_entry
ec338859 1605
a85d7ed0
NC		 1606 return true;
1607}
1608
a85d7ed0
NC		 1609/* Relocate a 390 ELF section. */
1610
1611static boolean
1612elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
1613 contents, relocs, local_syms, local_sections)
1614 bfd *output_bfd;
1615 struct bfd_link_info *info;
1616 bfd *input_bfd;
1617 asection *input_section;
1618 bfd_byte *contents;
1619 Elf_Internal_Rela *relocs;
1620 Elf_Internal_Sym *local_syms;
1621 asection **local_sections;
1622{
0451c93c 1623 struct elf_s390_link_hash_table *htab;
a85d7ed0
NC		 1624 Elf_Internal_Shdr *symtab_hdr;
1625 struct elf_link_hash_entry **sym_hashes;
1626 bfd_vma *local_got_offsets;
a85d7ed0
NC		 1627 Elf_Internal_Rela *rel;
1628 Elf_Internal_Rela *relend;
1629
0451c93c 1630 htab = elf_s390_hash_table (info);
a85d7ed0
NC		 1631 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1632 sym_hashes = elf_sym_hashes (input_bfd);
1633 local_got_offsets = elf_local_got_offsets (input_bfd);
1634
a85d7ed0
NC		 1635 rel = relocs;
1636 relend = relocs + input_section->reloc_count;
1637 for (; rel < relend; rel++)
1638 {
1639 int r_type;
1640 reloc_howto_type *howto;
1641 unsigned long r_symndx;
1642 struct elf_link_hash_entry *h;
1643 Elf_Internal_Sym *sym;
1644 asection *sec;
0451c93c 1645 bfd_vma off;
a85d7ed0 1646 bfd_vma relocation;
0451c93c 1647 boolean unresolved_reloc;
a85d7ed0 1648 bfd_reloc_status_type r;
ec338859 1649
a85d7ed0
NC		 1650 r_type = ELF32_R_TYPE (rel->r_info);
1651 if (r_type == (int) R_390_GNU_VTINHERIT
1652 || r_type == (int) R_390_GNU_VTENTRY)
1653 continue;
1654 if (r_type < 0 || r_type >= (int) R_390_max)
1655 {
1656 bfd_set_error (bfd_error_bad_value);
1657 return false;
1658 }
1659 howto = elf_howto_table + r_type;
ec338859 1660
a85d7ed0 1661 r_symndx = ELF32_R_SYM (rel->r_info);
ec338859 1662
a85d7ed0
NC		 1663 if (info->relocateable)
1664 {
1665 /* This is a relocateable link. We don't have to change
1666 anything, unless the reloc is against a section symbol,
1667 in which case we have to adjust according to where the
1668 section symbol winds up in the output section. */
1669 if (r_symndx < symtab_hdr->sh_info)
1670 {
1671 sym = local_syms + r_symndx;
1672 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1673 {
1674 sec = local_sections[r_symndx];
1675 rel->r_addend += sec->output_offset + sym->st_value;
1676 }
1677 }
ec338859 1678
a85d7ed0
NC		 1679 continue;
1680 }
ec338859 1681
a85d7ed0
NC		 1682 /* This is a final link. */
1683 h = NULL;
1684 sym = NULL;
1685 sec = NULL;
0451c93c 1686 unresolved_reloc = false;
a85d7ed0
NC		 1687 if (r_symndx < symtab_hdr->sh_info)
1688 {
1689 sym = local_syms + r_symndx;
1690 sec = local_sections[r_symndx];
f8df10f4 1691 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
a85d7ed0
NC		 1692 }
1693 else
1694 {
1695 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1696 while (h->root.type == bfd_link_hash_indirect
1697 || h->root.type == bfd_link_hash_warning)
1698 h = (struct elf_link_hash_entry *) h->root.u.i.link;
ec338859 1699
a85d7ed0
NC		 1700 if (h->root.type == bfd_link_hash_defined
1701 || h->root.type == bfd_link_hash_defweak)
1702 {
1703 sec = h->root.u.def.section;
27018c3f 1704 if (sec->output_section == NULL)
a85d7ed0 1705 {
0451c93c
MS		 1706 /* Set a flag that will be cleared later if we find a
1707 relocation value for this symbol. output_section
1708 is typically NULL for symbols satisfied by a shared
1709 library. */
1710 unresolved_reloc = true;
a85d7ed0
NC		 1711 relocation = 0;
1712 }
1713 else
1714 relocation = (h->root.u.def.value
1715 + sec->output_section->vma
1716 + sec->output_offset);
1717 }
1718 else if (h->root.type == bfd_link_hash_undefweak)
1719 relocation = 0;
671bae9c
NC		 1720 else if (info->shared
1721 && (!info->symbolic || info->allow_shlib_undefined)
a85d7ed0
NC		 1722 && !info->no_undefined
1723 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1724 relocation = 0;
1725 else
1726 {
1727 if (! ((*info->callbacks->undefined_symbol)
1728 (info, h->root.root.string, input_bfd,
1729 input_section, rel->r_offset,
0451c93c
MS		 1730 (!info->shared || info->no_undefined
1731 || ELF_ST_VISIBILITY (h->other)))))
a85d7ed0
NC		 1732 return false;
1733 relocation = 0;
1734 }
1735 }
ec338859 1736
a85d7ed0
NC		 1737 switch (r_type)
1738 {
1739 case R_390_GOT12:
1740 case R_390_GOT16:
1741 case R_390_GOT32:
befc3abb 1742 case R_390_GOTENT:
a85d7ed0
NC		 1743 /* Relocation is to the entry for this symbol in the global
1744 offset table. */
0451c93c
MS		 1745 if (htab->sgot == NULL)
1746 abort ();
ec338859 1747
a85d7ed0
NC		 1748 if (h != NULL)
1749 {
0451c93c 1750 boolean dyn;
ec338859 1751
a85d7ed0 1752 off = h->got.offset;
0451c93c
MS		 1753 dyn = htab->elf.dynamic_sections_created;
1754 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)
a85d7ed0 1755 || (info->shared
0451c93c
MS		 1756 && (info->symbolic
1757 || h->dynindx == -1
1758 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
a85d7ed0
NC		 1759 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1760 {
1761 /* This is actually a static link, or it is a
1762 -Bsymbolic link and the symbol is defined
1763 locally, or the symbol was forced to be local
1764 because of a version file. We must initialize
1765 this entry in the global offset table. Since the
1766 offset must always be a multiple of 2, we use the
1767 least significant bit to record whether we have
1768 initialized it already.
1769
1770 When doing a dynamic link, we create a .rel.got
1771 relocation entry to initialize the value. This
1772 is done in the finish_dynamic_symbol routine. */
1773 if ((off & 1) != 0)
1774 off &= ~1;
1775 else
1776 {
1777 bfd_put_32 (output_bfd, relocation,
0451c93c 1778 htab->sgot->contents + off);
a85d7ed0
NC		 1779 h->got.offset |= 1;
1780 }
1781 }
0451c93c
MS		 1782 else
1783 unresolved_reloc = false;
a85d7ed0
NC		 1784 }
1785 else
1786 {
0451c93c
MS		 1787 if (local_got_offsets == NULL)
1788 abort ();
a85d7ed0
NC		 1789
1790 off = local_got_offsets[r_symndx];
1791
1792 /* The offset must always be a multiple of 4. We use
1793 the least significant bit to record whether we have
1794 already generated the necessary reloc. */
1795 if ((off & 1) != 0)
1796 off &= ~1;
1797 else
1798 {
0451c93c
MS		 1799 bfd_put_32 (output_bfd, relocation,
1800 htab->sgot->contents + off);
a85d7ed0
NC		 1801
1802 if (info->shared)
1803 {
1804 asection *srelgot;
1805 Elf_Internal_Rela outrel;
0451c93c 1806 Elf32_External_Rela *loc;
a85d7ed0 1807
0451c93c
MS		 1808 srelgot = htab->srelgot;
1809 if (srelgot == NULL)
1810 abort ();
a85d7ed0 1811
0451c93c
MS		 1812 outrel.r_offset = (htab->sgot->output_section->vma
1813 + htab->sgot->output_offset
a85d7ed0
NC		 1814 + off);
1815 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
1816 outrel.r_addend = relocation;
0451c93c
MS		 1817 loc = (Elf32_External_Rela *) srelgot->contents;
1818 loc += srelgot->reloc_count++;
1819 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
a85d7ed0
NC		 1820 }
1821
1822 local_got_offsets[r_symndx] |= 1;
1823 }
a85d7ed0
NC		 1824 }
1825
0451c93c
MS		 1826 if (off >= (bfd_vma) -2)
1827 abort ();
a85d7ed0 1828
0451c93c 1829 relocation = htab->sgot->output_offset + off;
befc3abb
MS		 1830
1831 /*
1832 * For @GOTENT the relocation is against the offset between
1833 * the instruction and the symbols entry in the GOT and not
1834 * between the start of the GOT and the symbols entry. We
1835 * add the vma of the GOT to get the correct value.
1836 */
1837 if (r_type == R_390_GOTENT)
1838 relocation += htab->sgot->output_section->vma;
1839
a85d7ed0 1840 break;
dc810e39 1841
a85d7ed0
NC		 1842 case R_390_GOTOFF:
1843 /* Relocation is relative to the start of the global offset
1844 table. */
1845
a85d7ed0
NC		 1846 /* Note that sgot->output_offset is not involved in this
1847 calculation. We always want the start of .got. If we
1848 defined _GLOBAL_OFFSET_TABLE in a different way, as is
1849 permitted by the ABI, we might have to change this
1850 calculation. */
0451c93c 1851 relocation -= htab->sgot->output_section->vma;
a85d7ed0
NC		 1852 break;
1853
1854 case R_390_GOTPC:
befc3abb 1855 case R_390_GOTPCDBL:
a85d7ed0 1856 /* Use global offset table as symbol value. */
0451c93c
MS		 1857 relocation = htab->sgot->output_section->vma;
1858 unresolved_reloc = false;
a85d7ed0
NC		 1859 break;
1860
1861 case R_390_PLT16DBL:
befc3abb 1862 case R_390_PLT32DBL:
a85d7ed0
NC		 1863 case R_390_PLT32:
1864 /* Relocation is to the entry for this symbol in the
1865 procedure linkage table. */
1866
1867 /* Resolve a PLT32 reloc against a local symbol directly,
1868 without using the procedure linkage table. */
1869 if (h == NULL)
1870 break;
1871
0451c93c
MS		 1872 if (h->plt.offset == (bfd_vma) -1
1873 || htab->splt == NULL)
a85d7ed0
NC		 1874 {
1875 /* We didn't make a PLT entry for this symbol. This
1876 happens when statically linking PIC code, or when
1877 using -Bsymbolic. */
1878 break;
1879 }
1880
0451c93c
MS		 1881 relocation = (htab->splt->output_section->vma
1882 + htab->splt->output_offset
a85d7ed0 1883 + h->plt.offset);
0451c93c 1884 unresolved_reloc = false;
a85d7ed0
NC		 1885 break;
1886
1887 case R_390_8:
1888 case R_390_16:
1889 case R_390_32:
1890 case R_390_PC16:
1891 case R_390_PC16DBL:
befc3abb 1892 case R_390_PC32DBL:
a85d7ed0 1893 case R_390_PC32:
ec338859
AM		 1894 /* r_symndx will be zero only for relocs against symbols
1895 from removed linkonce sections, or sections discarded by
1896 a linker script. */
1897 if (r_symndx == 0
1898 || (input_section->flags & SEC_ALLOC) == 0)
1899 break;
1900
0451c93c 1901 if ((info->shared
0451c93c
MS		 1902 && ((r_type != R_390_PC16
1903 && r_type != R_390_PC16DBL
befc3abb 1904 && r_type != R_390_PC32DBL
0451c93c
MS		 1905 && r_type != R_390_PC32)
1906 || (h != NULL
1907 && h->dynindx != -1
1908 && (! info->symbolic
1909 || (h->elf_link_hash_flags
1910 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1911 || (!info->shared
0451c93c
MS		 1912 && h != NULL
1913 && h->dynindx != -1
1914 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1915 && (((h->elf_link_hash_flags
1916 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1917 && (h->elf_link_hash_flags
1918 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1919 || h->root.type == bfd_link_hash_undefweak
1920 || h->root.type == bfd_link_hash_undefined)))
a85d7ed0
NC		 1921 {
1922 Elf_Internal_Rela outrel;
1923 boolean skip, relocate;
0451c93c
MS		 1924 asection *sreloc;
1925 Elf32_External_Rela *loc;
ec338859 1926
0451c93c
MS		 1927 /* When generating a shared object, these relocations
1928 are copied into the output file to be resolved at run
1929 time. */
ec338859 1930
a85d7ed0 1931 skip = false;
0bb2d96a 1932 relocate = false;
ec338859 1933
c629eae0
JJ		 1934 outrel.r_offset =
1935 _bfd_elf_section_offset (output_bfd, info, input_section,
1936 rel->r_offset);
1937 if (outrel.r_offset == (bfd_vma) -1)
1938 skip = true;
0bb2d96a
JJ		 1939 else if (outrel.r_offset == (bfd_vma) -2)
1940 skip = true, relocate = true;
a85d7ed0
NC		 1941 outrel.r_offset += (input_section->output_section->vma
1942 + input_section->output_offset);
ec338859 1943
a85d7ed0 1944 if (skip)
0bb2d96a 1945 memset (&outrel, 0, sizeof outrel);
0451c93c
MS		 1946 else if (h != NULL
1947 && h->dynindx != -1
1948 && (r_type == R_390_PC16
1949 || r_type == R_390_PC16DBL
befc3abb 1950 || r_type == R_390_PC32DBL
0451c93c
MS		 1951 || r_type == R_390_PC32
1952 || !info->shared
1953 || !info->symbolic
1954 || (h->elf_link_hash_flags
1955 & ELF_LINK_HASH_DEF_REGULAR) == 0))
a85d7ed0 1956 {
a85d7ed0 1957 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
27018c3f 1958 outrel.r_addend = rel->r_addend;
a85d7ed0
NC		 1959 }
1960 else
1961 {
0451c93c
MS		 1962 /* This symbol is local, or marked to become local. */
1963 relocate = true;
1964 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
1965 outrel.r_addend = relocation + rel->r_addend;
a85d7ed0 1966 }
ec338859 1967
0451c93c
MS		 1968 sreloc = elf_section_data (input_section)->sreloc;
1969 if (sreloc == NULL)
1970 abort ();
ec338859 1971
0451c93c
MS		 1972 loc = (Elf32_External_Rela *) sreloc->contents;
1973 loc += sreloc->reloc_count++;
1974 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
ec338859 1975
a85d7ed0
NC		 1976 /* If this reloc is against an external symbol, we do
1977 not want to fiddle with the addend. Otherwise, we
1978 need to include the symbol value so that it becomes
1979 an addend for the dynamic reloc. */
1980 if (! relocate)
1981 continue;
1982 }
0451c93c 1983 break;
ec338859 1984
0451c93c
MS		 1985 default:
1986 break;
1987 }
ec338859 1988
0451c93c
MS		 1989 if (unresolved_reloc
1990 && !(info->shared
1991 && (input_section->flags & SEC_DEBUGGING) != 0
1992 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
1993 (*_bfd_error_handler)
1994 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
1995 bfd_archive_filename (input_bfd),
1996 bfd_get_section_name (input_bfd, input_section),
1997 (long) rel->r_offset,
1998 h->root.root.string);
ec338859 1999
a85d7ed0 2000 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
0451c93c
MS		 2001 contents, rel->r_offset,
2002 relocation, rel->r_addend);
ec338859 2003
a85d7ed0
NC		 2004 if (r != bfd_reloc_ok)
2005 {
0451c93c 2006 const char *name;
ec338859 2007
0451c93c
MS		 2008 if (h != NULL)
2009 name = h->root.root.string;
2010 else
a85d7ed0 2011 {
0451c93c
MS		 2012 name = bfd_elf_string_from_elf_section (input_bfd,
2013 symtab_hdr->sh_link,
2014 sym->st_name);
2015 if (name == NULL)
2016 return false;
2017 if (*name == '\0')
2018 name = bfd_section_name (input_bfd, sec);
2019 }
ec338859 2020
0451c93c
MS		 2021 if (r == bfd_reloc_overflow)
2022 {
ec338859 2023
0451c93c
MS		 2024 if (! ((*info->callbacks->reloc_overflow)
2025 (info, name, howto->name, (bfd_vma) 0,
2026 input_bfd, input_section, rel->r_offset)))
2027 return false;
2028 }
2029 else
2030 {
2031 (*_bfd_error_handler)
2032 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
2033 bfd_archive_filename (input_bfd),
2034 bfd_get_section_name (input_bfd, input_section),
2035 (long) rel->r_offset, name, (int) r);
2036 return false;
a85d7ed0
NC		 2037 }
2038 }
2039 }
ec338859 2040
a85d7ed0
NC		 2041 return true;
2042}
2043
2044/* Finish up dynamic symbol handling. We set the contents of various
2045 dynamic sections here. */
2046
2047static boolean
2048elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
2049 bfd *output_bfd;
2050 struct bfd_link_info *info;
2051 struct elf_link_hash_entry *h;
2052 Elf_Internal_Sym *sym;
2053{
0451c93c 2054 struct elf_s390_link_hash_table *htab;
ec338859 2055
0451c93c 2056 htab = elf_s390_hash_table (info);
ec338859 2057
a85d7ed0
NC		 2058 if (h->plt.offset != (bfd_vma) -1)
2059 {
0451c93c
MS		 2060 bfd_vma plt_index;
2061 bfd_vma got_offset;
a85d7ed0 2062 Elf_Internal_Rela rela;
0451c93c 2063 Elf32_External_Rela *loc;
a85d7ed0 2064 bfd_vma relative_offset;
ec338859 2065
a85d7ed0
NC		 2066 /* This symbol has an entry in the procedure linkage table. Set
2067 it up. */
ec338859 2068
0451c93c
MS		 2069 if (h->dynindx == -1
2070 || htab->splt == NULL
2071 || htab->sgotplt == NULL
2072 || htab->srelplt == NULL)
2073 abort ();
a85d7ed0 2074
dc810e39 2075 /* Calc. index no.
a85d7ed0
NC		 2076 Current offset - size first entry / entry size. */
2077 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
2078
2079 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2080 addr & GOT addr. */
2081 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
2082
2083 /* S390 uses halfwords for relative branch calc! */
dc810e39
AM		 2084 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
2085 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
a85d7ed0
NC		 2086 /* If offset is > 32768, branch to a previous branch
2087 390 can only handle +-64 K jumps. */
dc810e39
AM		 2088 if ( -32768 > (int) relative_offset )
2089 relative_offset =
2090 -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
a85d7ed0
NC		 2091
2092 /* Fill in the entry in the procedure linkage table. */
2093 if (!info->shared)
0451c93c
MS		 2094 {
2095 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
2096 htab->splt->contents + h->plt.offset);
2097 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
2098 htab->splt->contents + h->plt.offset + 4);
2099 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
2100 htab->splt->contents + h->plt.offset + 8);
2101 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
2102 htab->splt->contents + h->plt.offset + 12);
2103 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
2104 htab->splt->contents + h->plt.offset + 16);
2105 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
2106 htab->splt->contents + h->plt.offset + 20);
2107 bfd_put_32 (output_bfd,
2108 (htab->sgotplt->output_section->vma
2109 + htab->sgotplt->output_offset
2110 + got_offset),
2111 htab->splt->contents + h->plt.offset + 24);
2112 }
a85d7ed0 2113 else if (got_offset < 4096)
0451c93c
MS		 2114 {
2115 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD0 + got_offset,
2116 htab->splt->contents + h->plt.offset);
2117 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD1,
2118 htab->splt->contents + h->plt.offset + 4);
2119 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD2,
2120 htab->splt->contents + h->plt.offset + 8);
2121 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD3,
2122 htab->splt->contents + h->plt.offset + 12);
2123 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD4,
2124 htab->splt->contents + h->plt.offset + 16);
2125 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
2126 htab->splt->contents + h->plt.offset + 20);
2127 bfd_put_32 (output_bfd, (bfd_vma) 0,
2128 htab->splt->contents + h->plt.offset + 24);
2129 }
a85d7ed0 2130 else if (got_offset < 32768)
0451c93c
MS		 2131 {
2132 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD0 + got_offset,
2133 htab->splt->contents + h->plt.offset);
2134 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD1,
2135 htab->splt->contents + h->plt.offset + 4);
2136 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD2,
2137 htab->splt->contents + h->plt.offset + 8);
2138 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD3,
2139 htab->splt->contents + h->plt.offset + 12);
2140 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD4,
2141 htab->splt->contents + h->plt.offset + 16);
2142 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
2143 htab->splt->contents + h->plt.offset + 20);
2144 bfd_put_32 (output_bfd, (bfd_vma) 0,
2145 htab->splt->contents + h->plt.offset + 24);
2146 }
a85d7ed0 2147 else
0451c93c
MS		 2148 {
2149 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD0,
2150 htab->splt->contents + h->plt.offset);
2151 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD1,
2152 htab->splt->contents + h->plt.offset + 4);
2153 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD2,
2154 htab->splt->contents + h->plt.offset + 8);
2155 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD3,
2156 htab->splt->contents + h->plt.offset + 12);
2157 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD4,
2158 htab->splt->contents + h->plt.offset + 16);
2159 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
2160 htab->splt->contents + h->plt.offset + 20);
2161 bfd_put_32 (output_bfd, got_offset,
2162 htab->splt->contents + h->plt.offset + 24);
2163 }
a85d7ed0
NC		 2164 /* Insert offset into reloc. table here. */
2165 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
0451c93c 2166 htab->splt->contents + h->plt.offset + 28);
a85d7ed0
NC		 2167
2168 /* Fill in the entry in the global offset table.
2169 Points to instruction after GOT offset. */
2170 bfd_put_32 (output_bfd,
0451c93c
MS		 2171 (htab->splt->output_section->vma
2172 + htab->splt->output_offset
a85d7ed0
NC		 2173 + h->plt.offset
2174 + 12),
0451c93c 2175 htab->sgotplt->contents + got_offset);
a85d7ed0 2176
0451c93c
MS		 2177 /* Fill in the entry in the .rela.plt section. */
2178 rela.r_offset = (htab->sgotplt->output_section->vma
2179 + htab->sgotplt->output_offset
2180 + got_offset);
2181 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
2182 rela.r_addend = 0;
2183 loc = (Elf32_External_Rela *) htab->srelplt->contents + plt_index;
2184 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
ec338859 2185
a85d7ed0
NC		 2186 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2187 {
2188 /* Mark the symbol as undefined, rather than as defined in
0451c93c
MS		 2189 the .plt section. Leave the value alone. This is a clue
2190 for the dynamic linker, to make function pointer
2191 comparisons work between an application and shared
ec338859 2192 library. */
a85d7ed0
NC		 2193 sym->st_shndx = SHN_UNDEF;
2194 }
2195 }
ec338859 2196
a85d7ed0
NC		 2197 if (h->got.offset != (bfd_vma) -1)
2198 {
a85d7ed0 2199 Elf_Internal_Rela rela;
0451c93c 2200 Elf32_External_Rela *loc;
a85d7ed0
NC		 2201
2202 /* This symbol has an entry in the global offset table. Set it
2203 up. */
2204
0451c93c
MS		 2205 if (htab->sgot == NULL || htab->srelgot == NULL)
2206 abort ();
a85d7ed0 2207
0451c93c
MS		 2208 rela.r_offset = (htab->sgot->output_section->vma
2209 + htab->sgot->output_offset
dc810e39 2210 + (h->got.offset &~ (bfd_vma) 1));
a85d7ed0
NC		 2211
2212 /* If this is a static link, or it is a -Bsymbolic link and the
2213 symbol is defined locally or was forced to be local because
2214 of a version file, we just want to emit a RELATIVE reloc.
2215 The entry in the global offset table will already have been
2216 initialized in the relocate_section function. */
0451c93c
MS		 2217 if (info->shared
2218 && (info->symbolic
2219 || h->dynindx == -1
2220 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
2221 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
2222 {
2223 BFD_ASSERT((h->got.offset & 1) != 0);
2224 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2225 rela.r_addend = (h->root.u.def.value
a85d7ed0
NC		 2226 + h->root.u.def.section->output_section->vma
2227 + h->root.u.def.section->output_offset);
2228 }
2229 else
2230 {
2231 BFD_ASSERT((h->got.offset & 1) == 0);
0451c93c 2232 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
a85d7ed0
NC		 2233 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
2234 rela.r_addend = 0;
2235 }
2236
0451c93c
MS		 2237 loc = (Elf32_External_Rela *) htab->srelgot->contents;
2238 loc += htab->srelgot->reloc_count++;
2239 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
a85d7ed0
NC		 2240 }
2241
2242 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
2243 {
a85d7ed0 2244 Elf_Internal_Rela rela;
0451c93c 2245 Elf32_External_Rela *loc;
a85d7ed0
NC		 2246
2247 /* This symbols needs a copy reloc. Set it up. */
2248
0451c93c
MS		 2249 if (h->dynindx == -1
2250 || (h->root.type != bfd_link_hash_defined
2251 && h->root.type != bfd_link_hash_defweak)
2252 || htab->srelbss == NULL)
2253 abort ();
a85d7ed0
NC		 2254
2255 rela.r_offset = (h->root.u.def.value
2256 + h->root.u.def.section->output_section->vma
2257 + h->root.u.def.section->output_offset);
2258 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
2259 rela.r_addend = 0;
0451c93c
MS		 2260 loc = (Elf32_External_Rela *) htab->srelbss->contents;
2261 loc += htab->srelbss->reloc_count++;
2262 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
a85d7ed0
NC		 2263 }
2264
2265 /* Mark some specially defined symbols as absolute. */
2266 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2267 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
2268 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
2269 sym->st_shndx = SHN_ABS;
2270
2271 return true;
2272}
2273
0451c93c
MS		 2274/* Used to decide how to sort relocs in an optimal manner for the
2275 dynamic linker, before writing them out. */
2276
2277static enum elf_reloc_type_class
2278elf_s390_reloc_type_class (rela)
2279 const Elf_Internal_Rela *rela;
2280{
2281 switch ((int) ELF32_R_TYPE (rela->r_info))
2282 {
2283 case R_390_RELATIVE:
2284 return reloc_class_relative;
2285 case R_390_JMP_SLOT:
2286 return reloc_class_plt;
2287 case R_390_COPY:
2288 return reloc_class_copy;
2289 default:
2290 return reloc_class_normal;
2291 }
2292}
2293
a85d7ed0
NC		 2294/* Finish up the dynamic sections. */
2295
2296static boolean
2297elf_s390_finish_dynamic_sections (output_bfd, info)
2298 bfd *output_bfd;
2299 struct bfd_link_info *info;
2300{
0451c93c 2301 struct elf_s390_link_hash_table *htab;
a85d7ed0
NC		 2302 bfd *dynobj;
2303 asection *sdyn;
a85d7ed0 2304
0451c93c
MS		 2305 htab = elf_s390_hash_table (info);
2306 dynobj = htab->elf.dynobj;
a85d7ed0
NC		 2307 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2308
0451c93c 2309 if (htab->elf.dynamic_sections_created)
a85d7ed0 2310 {
a85d7ed0
NC		 2311 Elf32_External_Dyn *dyncon, *dynconend;
2312
0451c93c
MS		 2313 if (sdyn == NULL || htab->sgot == NULL)
2314 abort ();
a85d7ed0
NC		 2315
2316 dyncon = (Elf32_External_Dyn *) sdyn->contents;
2317 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2318 for (; dyncon < dynconend; dyncon++)
2319 {
2320 Elf_Internal_Dyn dyn;
a85d7ed0 2321 asection *s;
ec338859 2322
a85d7ed0 2323 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
ec338859 2324
a85d7ed0
NC		 2325 switch (dyn.d_tag)
2326 {
2327 default:
0451c93c 2328 continue;
ec338859 2329
a85d7ed0 2330 case DT_PLTGOT:
0451c93c
MS		 2331 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
2332 break;
ec338859 2333
a85d7ed0 2334 case DT_JMPREL:
0451c93c 2335 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
a85d7ed0
NC		 2336 break;
2337
2338 case DT_PLTRELSZ:
0451c93c 2339 s = htab->srelplt->output_section;
a85d7ed0
NC		 2340 if (s->_cooked_size != 0)
2341 dyn.d_un.d_val = s->_cooked_size;
2342 else
2343 dyn.d_un.d_val = s->_raw_size;
a85d7ed0
NC		 2344 break;
2345 }
0451c93c
MS		 2346
2347 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
a85d7ed0
NC		 2348 }
2349
2350 /* Fill in the special first entry in the procedure linkage table. */
0451c93c 2351 if (htab->splt && htab->splt->_raw_size > 0)
a85d7ed0 2352 {
0451c93c 2353 memset (htab->splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
a85d7ed0 2354 if (info->shared)
0451c93c 2355 {
dc810e39 2356 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD0,
0451c93c 2357 htab->splt->contents );
dc810e39 2358 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD1,
0451c93c 2359 htab->splt->contents +4 );
dc810e39 2360 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD2,
0451c93c 2361 htab->splt->contents +8 );
dc810e39 2362 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD3,
0451c93c 2363 htab->splt->contents +12 );
dc810e39 2364 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD4,
0451c93c 2365 htab->splt->contents +16 );
a85d7ed0
NC		 2366 }
2367 else
2368 {
0451c93c
MS		 2369 bfd_put_32 (output_bfd, (bfd_vma)PLT_FIRST_ENTRY_WORD0,
2370 htab->splt->contents );
dc810e39 2371 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
0451c93c 2372 htab->splt->contents +4 );
dc810e39 2373 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD2,
0451c93c 2374 htab->splt->contents +8 );
dc810e39 2375 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
0451c93c 2376 htab->splt->contents +12 );
dc810e39 2377 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
0451c93c 2378 htab->splt->contents +16 );
dc810e39 2379 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
0451c93c 2380 htab->splt->contents +20 );
a85d7ed0 2381 bfd_put_32 (output_bfd,
0451c93c
MS		 2382 htab->sgotplt->output_section->vma
2383 + htab->sgotplt->output_offset,
2384 htab->splt->contents + 24);
a85d7ed0 2385 }
0451c93c
MS		 2386 elf_section_data (htab->splt->output_section)
2387 ->this_hdr.sh_entsize = 4;
a85d7ed0
NC		 2388 }
2389
2390 }
2391
0451c93c 2392 if (htab->sgotplt)
a85d7ed0 2393 {
0451c93c
MS		 2394 /* Fill in the first three entries in the global offset table. */
2395 if (htab->sgotplt->_raw_size > 0)
2396 {
2397 bfd_put_32 (output_bfd,
2398 (sdyn == NULL ? (bfd_vma) 0
2399 : sdyn->output_section->vma + sdyn->output_offset),
2400 htab->sgotplt->contents);
2401 /* One entry for shared object struct ptr. */
2402 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4);
2403 /* One entry for _dl_runtime_resolve. */
2404 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
2405 }
a85d7ed0 2406
0451c93c
MS		 2407 elf_section_data (htab->sgotplt->output_section)
2408 ->this_hdr.sh_entsize = 4;
2409 }
a85d7ed0
NC		 2410 return true;
2411}
2412
2413static boolean
2414elf_s390_object_p (abfd)
2415 bfd *abfd;
2416{
befc3abb 2417 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31);
a85d7ed0
NC		 2418}
2419
979f4a38
NC		 2420static boolean
2421elf_s390_grok_prstatus (abfd, note)
2422 bfd * abfd;
2423 Elf_Internal_Note * note;
2424{
2425 int offset;
2426 unsigned int raw_size;
2427
2428 switch (note->descsz)
2429 {
2430 default:
2431 return false;
2432
2433 case 224: /* S/390 Linux. */
2434 /* pr_cursig */
2435 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
2436
2437 /* pr_pid */
2438 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
2439
2440 /* pr_reg */
2441 offset = 72;
2442 raw_size = 144;
2443 break;
2444 }
2445
2446 /* Make a ".reg/999" section. */
2447 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
2448 raw_size, note->descpos + offset);
2449}
2450
a85d7ed0
NC		 2451#define TARGET_BIG_SYM bfd_elf32_s390_vec
2452#define TARGET_BIG_NAME "elf32-s390"
2453#define ELF_ARCH bfd_arch_s390
2454#define ELF_MACHINE_CODE EM_S390
2455#define ELF_MACHINE_ALT1 EM_S390_OLD
2456#define ELF_MAXPAGESIZE 0x1000
2457
2458#define elf_backend_can_gc_sections 1
51b64d56 2459#define elf_backend_can_refcount 1
a85d7ed0
NC		 2460#define elf_backend_want_got_plt 1
2461#define elf_backend_plt_readonly 1
2462#define elf_backend_want_plt_sym 0
2463#define elf_backend_got_header_size 12
2464#define elf_backend_plt_header_size PLT_ENTRY_SIZE
2465
2466#define elf_info_to_howto elf_s390_info_to_howto
2467
a85d7ed0
NC		 2468#define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
2469#define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
2470#define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
2471
2472#define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
2473#define elf_backend_check_relocs elf_s390_check_relocs
0451c93c
MS		 2474#define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
2475#define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
a85d7ed0
NC		 2476#define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
2477#define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
2478#define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
2479#define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
0451c93c 2480#define elf_backend_reloc_type_class elf_s390_reloc_type_class
a85d7ed0
NC		 2481#define elf_backend_relocate_section elf_s390_relocate_section
2482#define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
29c2fb7c 2483#define elf_backend_reloc_type_class elf_s390_reloc_type_class
979f4a38 2484#define elf_backend_grok_prstatus elf_s390_grok_prstatus
a85d7ed0
NC		 2485
2486#define elf_backend_object_p elf_s390_object_p
2487
2488#include "elf32-target.h"
GDB Binutils - Deliverables
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