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2001-11-06 Fred Fish <fnf@redhat.com>
[deliverable/binutils-gdb.git] / bfd / elf64-s390.c
CommitLineData
a85d7ed0 1/* IBM S/390-specific support for 64-bit ELF
7898deda 2 Copyright 2000, 2001 Free Software Foundation, Inc.
a85d7ed0
NC		 3 Contributed Martin Schwidefsky (schwidefsky@de.ibm.com).
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
20 02111-1307, USA. */
21
22#include "bfd.h"
23#include "sysdep.h"
24#include "bfdlink.h"
25#include "libbfd.h"
26#include "elf-bfd.h"
27
28static reloc_howto_type *elf_s390_reloc_type_lookup
29 PARAMS ((bfd *, bfd_reloc_code_real_type));
30static void elf_s390_info_to_howto
31 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
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 *));
99c79b2e
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 *));
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 *));
99c79b2e 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/* In case we're on a 32-bit machine, construct a 64-bit "-1" value
67 from smaller values. Start with zero, widen, *then* decrement. */
68#define MINUS_ONE (((bfd_vma)0) - 1)
69
70/* The relocation "howto" table. */
71static reloc_howto_type elf_howto_table[] =
72{
73 HOWTO (R_390_NONE, /* type */
74 0, /* rightshift */
75 0, /* size (0 = byte, 1 = short, 2 = long) */
76 0, /* bitsize */
77 false, /* pc_relative */
78 0, /* bitpos */
79 complain_overflow_dont, /* complain_on_overflow */
80 bfd_elf_generic_reloc, /* special_function */
81 "R_390_NONE", /* name */
82 false, /* partial_inplace */
83 0, /* src_mask */
84 0, /* dst_mask */
85 false), /* pcrel_offset */
86
87 HOWTO(R_390_8, 0, 0, 8, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_8", false, 0,0x000000ff, false),
88 HOWTO(R_390_12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_12", false, 0,0x00000fff, false),
89 HOWTO(R_390_16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_16", false, 0,0x0000ffff, false),
90 HOWTO(R_390_32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_32", false, 0,0xffffffff, false),
91 HOWTO(R_390_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32", false, 0,0xffffffff, true),
92 HOWTO(R_390_GOT12, 0, 1, 12, false, 0, complain_overflow_dont, bfd_elf_generic_reloc, "R_390_GOT12", false, 0,0x00000fff, false),
93 HOWTO(R_390_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT32", false, 0,0xffffffff, false),
94 HOWTO(R_390_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32", false, 0,0xffffffff, true),
95 HOWTO(R_390_COPY, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_COPY", false, 0,MINUS_ONE, false),
96 HOWTO(R_390_GLOB_DAT, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GLOB_DAT",false, 0,MINUS_ONE, false),
97 HOWTO(R_390_JMP_SLOT, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_JMP_SLOT",false, 0,MINUS_ONE, false),
98 HOWTO(R_390_RELATIVE, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_RELATIVE",false, 0,MINUS_ONE, false),
99 HOWTO(R_390_GOTOFF, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTOFF", false, 0,MINUS_ONE, false),
100 HOWTO(R_390_GOTPC, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPC", false, 0,MINUS_ONE, true),
101 HOWTO(R_390_GOT16, 0, 1, 16, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT16", false, 0,0x0000ffff, false),
102 HOWTO(R_390_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16", false, 0,0x0000ffff, true),
103 HOWTO(R_390_PC16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC16DBL", false, 0,0x0000ffff, true),
104 HOWTO(R_390_PLT16DBL, 1, 1, 16, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT16DBL", false, 0,0x0000ffff, true),
105 HOWTO(R_390_PC32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC32DBL", false, 0,0xffffffff, true),
106 HOWTO(R_390_PLT32DBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT32DBL", false, 0,0xffffffff, true),
107 HOWTO(R_390_GOTPCDBL, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTPCDBL", false, 0,MINUS_ONE, true),
108 HOWTO(R_390_64, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_64", false, 0,MINUS_ONE, false),
109 HOWTO(R_390_PC64, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PC64", false, 0,MINUS_ONE, true),
110 HOWTO(R_390_GOT64, 0, 4, 64, false, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOT64", false, 0,MINUS_ONE, false),
111 HOWTO(R_390_PLT64, 0, 4, 64, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_PLT64", false, 0,MINUS_ONE, true),
112 HOWTO(R_390_GOTENT, 1, 2, 32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_390_GOTENT", false, 0,MINUS_ONE, true),
113};
114
115/* GNU extension to record C++ vtable hierarchy. */
116static reloc_howto_type elf64_s390_vtinherit_howto =
117 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,false,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", false,0, 0, false);
118static reloc_howto_type elf64_s390_vtentry_howto =
99c79b2e 119 HOWTO (R_390_GNU_VTENTRY, 0,4,0,false,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", false,0,0, false);
a85d7ed0
NC		 120
121static reloc_howto_type *
122elf_s390_reloc_type_lookup (abfd, code)
123 bfd *abfd ATTRIBUTE_UNUSED;
124 bfd_reloc_code_real_type code;
125{
126 switch (code) {
127 case BFD_RELOC_NONE:
128 return &elf_howto_table[(int) R_390_NONE];
129 case BFD_RELOC_8:
130 return &elf_howto_table[(int) R_390_8];
131 case BFD_RELOC_390_12:
132 return &elf_howto_table[(int) R_390_12];
133 case BFD_RELOC_16:
134 return &elf_howto_table[(int) R_390_16];
135 case BFD_RELOC_32:
136 return &elf_howto_table[(int) R_390_32];
137 case BFD_RELOC_CTOR:
138 return &elf_howto_table[(int) R_390_32];
139 case BFD_RELOC_32_PCREL:
140 return &elf_howto_table[(int) R_390_PC32];
141 case BFD_RELOC_390_GOT12:
142 return &elf_howto_table[(int) R_390_GOT12];
143 case BFD_RELOC_32_GOT_PCREL:
144 return &elf_howto_table[(int) R_390_GOT32];
145 case BFD_RELOC_390_PLT32:
146 return &elf_howto_table[(int) R_390_PLT32];
147 case BFD_RELOC_390_COPY:
148 return &elf_howto_table[(int) R_390_COPY];
149 case BFD_RELOC_390_GLOB_DAT:
150 return &elf_howto_table[(int) R_390_GLOB_DAT];
151 case BFD_RELOC_390_JMP_SLOT:
152 return &elf_howto_table[(int) R_390_JMP_SLOT];
153 case BFD_RELOC_390_RELATIVE:
154 return &elf_howto_table[(int) R_390_RELATIVE];
155 case BFD_RELOC_32_GOTOFF:
156 return &elf_howto_table[(int) R_390_GOTOFF];
157 case BFD_RELOC_390_GOTPC:
158 return &elf_howto_table[(int) R_390_GOTPC];
159 case BFD_RELOC_390_GOT16:
160 return &elf_howto_table[(int) R_390_GOT16];
161 case BFD_RELOC_16_PCREL:
162 return &elf_howto_table[(int) R_390_PC16];
163 case BFD_RELOC_390_PC16DBL:
164 return &elf_howto_table[(int) R_390_PC16DBL];
165 case BFD_RELOC_390_PLT16DBL:
166 return &elf_howto_table[(int) R_390_PLT16DBL];
167 case BFD_RELOC_VTABLE_INHERIT:
168 return &elf64_s390_vtinherit_howto;
169 case BFD_RELOC_VTABLE_ENTRY:
170 return &elf64_s390_vtentry_howto;
171 case BFD_RELOC_390_PC32DBL:
172 return &elf_howto_table[(int) R_390_PC32DBL];
173 case BFD_RELOC_390_PLT32DBL:
174 return &elf_howto_table[(int) R_390_PLT32DBL];
175 case BFD_RELOC_390_GOTPCDBL:
176 return &elf_howto_table[(int) R_390_GOTPCDBL];
177 case BFD_RELOC_64:
178 return &elf_howto_table[(int) R_390_64];
179 case BFD_RELOC_64_PCREL:
180 return &elf_howto_table[(int) R_390_PC64];
181 case BFD_RELOC_390_GOT64:
182 return &elf_howto_table[(int) R_390_GOT64];
183 case BFD_RELOC_390_PLT64:
184 return &elf_howto_table[(int) R_390_PLT64];
185 case BFD_RELOC_390_GOTENT:
186 return &elf_howto_table[(int) R_390_GOTENT];
187 default:
99c79b2e 188 break;
a85d7ed0
NC		 189 }
190 return 0;
191}
192
193/* We need to use ELF64_R_TYPE so we have our own copy of this function,
194 and elf64-s390.c has its own copy. */
195
196static void
197elf_s390_info_to_howto (abfd, cache_ptr, dst)
198 bfd *abfd ATTRIBUTE_UNUSED;
199 arelent *cache_ptr;
200 Elf_Internal_Rela *dst;
201{
202 switch (ELF64_R_TYPE(dst->r_info))
203 {
204 case R_390_GNU_VTINHERIT:
205 cache_ptr->howto = &elf64_s390_vtinherit_howto;
206 break;
207
208 case R_390_GNU_VTENTRY:
209 cache_ptr->howto = &elf64_s390_vtentry_howto;
210 break;
211
212 default:
213 BFD_ASSERT (ELF64_R_TYPE(dst->r_info) < (unsigned int) R_390_max);
214 cache_ptr->howto = &elf_howto_table[ELF64_R_TYPE(dst->r_info)];
99c79b2e 215 }
a85d7ed0
NC		 216}
217
218static boolean
219elf_s390_is_local_label_name (abfd, name)
220 bfd *abfd;
221 const char *name;
222{
223 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
224 return true;
225
226 return _bfd_elf_is_local_label_name (abfd, name);
227}
228
229/* Functions for the 390 ELF linker. */
230
231/* The name of the dynamic interpreter. This is put in the .interp
232 section. */
233
234#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
235
236/* The nop opcode we use. */
237
238#define s390_NOP 0x07070707
239
240
241/* The size in bytes of the first entry in the procedure linkage table. */
242#define PLT_FIRST_ENTRY_SIZE 32
243/* The size in bytes of an entry in the procedure linkage table. */
99c79b2e 244#define PLT_ENTRY_SIZE 32
a85d7ed0
NC		 245
246#define GOT_ENTRY_SIZE 8
247
248/* The first three entries in a procedure linkage table are reserved,
249 and the initial contents are unimportant (we zero them out).
250 Subsequent entries look like this. See the SVR4 ABI 386
251 supplement to see how this works. */
252
253/* For the s390, simple addr offset can only be 0 - 4096.
254 To use the full 16777216 TB address space, several instructions
255 are needed to load an address in a register and execute
256 a branch( or just saving the address)
257
99c79b2e 258 Furthermore, only r 0 and 1 are free to use!!! */
a85d7ed0
NC		 259
260/* The first 3 words in the GOT are then reserved.
261 Word 0 is the address of the dynamic table.
262 Word 1 is a pointer to a structure describing the object
263 Word 2 is used to point to the loader entry address.
264
265 The code for PLT entries looks like this:
266
267 The GOT holds the address in the PLT to be executed.
268 The loader then gets:
269 24(15) = Pointer to the structure describing the object.
99c79b2e 270 28(15) = Offset in symbol table
a85d7ed0
NC		 271 The loader must then find the module where the function is
272 and insert the address in the GOT.
273
274 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
275 LG 1,0(1) # 6 bytes Load address from GOT in r1
276 BCR 15,1 # 2 bytes Jump to address
277 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
278 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1
279 BRCL 15,-x # 6 bytes Jump to start of PLT
280 .long ? # 4 bytes offset into symbol table
281
282 Total = 32 bytes per PLT entry
283 Fixup at offset 2: relative address to GOT entry
284 Fixup at offset 22: relative branch to PLT0
285 Fixup at offset 28: 32 bit offset into symbol table
286
287 A 32 bit offset into the symbol table is enough. It allows for symbol
288 tables up to a size of 2 gigabyte. A single dynamic object (the main
289 program, any shared library) is limited to 4GB in size and I want to see
290 the program that manages to have a symbol table of more than 2 GB with a
291 total size of at max 4 GB. */
292
dc810e39
AM		 293#define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000
294#define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310
295#define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004
296#define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10
297#define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c
298#define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4
299#define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000
300#define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000
a85d7ed0
NC		 301
302/* The first PLT entry pushes the offset into the symbol table
303 from R1 onto the stack at 8(15) and the loader object info
304 at 12(15), loads the loader address in R1 and jumps to it. */
305
306/* The first entry in the PLT:
307
308 PLT0:
309 STG 1,56(15) # r1 contains the offset into the symbol table
310 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
311 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
312 LG 1,16(1) # get entry address of loader
313 BCR 15,1 # jump to loader
314
315 Fixup at offset 8: relative address to start of GOT. */
316
dc810e39
AM		 317#define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038
318#define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010
319#define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000
320#define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030
321#define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310
322#define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004
323#define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700
324#define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700
a85d7ed0
NC		 325
326/* The s390 linker needs to keep track of the number of relocs that it
327 decides to copy in check_relocs for each symbol. This is so that
328 it can discard PC relative relocs if it doesn't need them when
329 linking with -Bsymbolic. We store the information in a field
330 extending the regular ELF linker hash table. */
331
332/* This structure keeps track of the number of PC relative relocs we
333 have copied for a given symbol. */
334
335struct elf_s390_pcrel_relocs_copied
336{
337 /* Next section. */
338 struct elf_s390_pcrel_relocs_copied *next;
339 /* A section in dynobj. */
340 asection *section;
341 /* Number of relocs copied in this section. */
342 bfd_size_type count;
343};
344
345/* s390 ELF linker hash entry. */
346
347struct elf_s390_link_hash_entry
348{
349 struct elf_link_hash_entry root;
350
351 /* Number of PC relative relocs copied for this symbol. */
352 struct elf_s390_pcrel_relocs_copied *pcrel_relocs_copied;
353};
354
355/* s390 ELF linker hash table. */
356
357struct elf_s390_link_hash_table
358{
359 struct elf_link_hash_table root;
360};
361
362/* Declare this now that the above structures are defined. */
363
364static boolean elf_s390_discard_copies
365 PARAMS ((struct elf_s390_link_hash_entry *, PTR));
366
367/* Traverse an s390 ELF linker hash table. */
368
369#define elf_s390_link_hash_traverse(table, func, info) \
370 (elf_link_hash_traverse \
371 (&(table)->root, \
372 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
373 (info)))
374
375/* Get the s390 ELF linker hash table from a link_info structure. */
376
377#define elf_s390_hash_table(p) \
378 ((struct elf_s390_link_hash_table *) ((p)->hash))
379
380/* Create an entry in an s390 ELF linker hash table. */
381
382static struct bfd_hash_entry *
383elf_s390_link_hash_newfunc (entry, table, string)
384 struct bfd_hash_entry *entry;
385 struct bfd_hash_table *table;
386 const char *string;
387{
388 struct elf_s390_link_hash_entry *ret =
389 (struct elf_s390_link_hash_entry *) entry;
390
391 /* Allocate the structure if it has not already been allocated by a
392 subclass. */
393 if (ret == (struct elf_s390_link_hash_entry *) NULL)
394 ret = ((struct elf_s390_link_hash_entry *)
395 bfd_hash_allocate (table,
396 sizeof (struct elf_s390_link_hash_entry)));
397 if (ret == (struct elf_s390_link_hash_entry *) NULL)
398 return (struct bfd_hash_entry *) ret;
399
400 /* Call the allocation method of the superclass. */
401 ret = ((struct elf_s390_link_hash_entry *)
402 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
403 table, string));
404 if (ret != (struct elf_s390_link_hash_entry *) NULL)
405 {
406 ret->pcrel_relocs_copied = NULL;
407 }
408
409 return (struct bfd_hash_entry *) ret;
410}
411
412/* Create an s390 ELF linker hash table. */
413
414static struct bfd_link_hash_table *
415elf_s390_link_hash_table_create (abfd)
416 bfd *abfd;
417{
418 struct elf_s390_link_hash_table *ret;
dc810e39 419 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
a85d7ed0 420
dc810e39 421 ret = ((struct elf_s390_link_hash_table *) bfd_alloc (abfd, amt));
a85d7ed0
NC		 422 if (ret == (struct elf_s390_link_hash_table *) NULL)
423 return NULL;
424
425 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
426 elf_s390_link_hash_newfunc))
427 {
428 bfd_release (abfd, ret);
429 return NULL;
430 }
431
432 return &ret->root.root;
433}
434
435
436/* Look through the relocs for a section during the first phase, and
437 allocate space in the global offset table or procedure linkage
438 table. */
439
440static boolean
441elf_s390_check_relocs (abfd, info, sec, relocs)
442 bfd *abfd;
443 struct bfd_link_info *info;
444 asection *sec;
445 const Elf_Internal_Rela *relocs;
446{
447 bfd *dynobj;
448 Elf_Internal_Shdr *symtab_hdr;
449 struct elf_link_hash_entry **sym_hashes;
450 bfd_signed_vma *local_got_refcounts;
451 const Elf_Internal_Rela *rel;
452 const Elf_Internal_Rela *rel_end;
453 asection *sgot;
454 asection *srelgot;
455 asection *sreloc;
456
457 if (info->relocateable)
458 return true;
459
460 dynobj = elf_hash_table (info)->dynobj;
461 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
462 sym_hashes = elf_sym_hashes (abfd);
463 local_got_refcounts = elf_local_got_offsets (abfd);
464
465 sgot = NULL;
466 srelgot = NULL;
467 sreloc = NULL;
468
469 rel_end = relocs + sec->reloc_count;
470 for (rel = relocs; rel < rel_end; rel++)
471 {
472 unsigned long r_symndx;
473 struct elf_link_hash_entry *h;
474
475 r_symndx = ELF64_R_SYM (rel->r_info);
476
477 if (r_symndx < symtab_hdr->sh_info)
478 h = NULL;
479 else
99c79b2e 480 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
a85d7ed0
NC		 481
482 /* Some relocs require a global offset table. */
483 if (dynobj == NULL)
484 {
485 switch (ELF64_R_TYPE (rel->r_info))
486 {
487 case R_390_GOT12:
488 case R_390_GOT16:
489 case R_390_GOT32:
490 case R_390_GOT64:
491 case R_390_GOTOFF:
492 case R_390_GOTPC:
493 case R_390_GOTPCDBL:
494 case R_390_GOTENT:
495 elf_hash_table (info)->dynobj = dynobj = abfd;
496 if (! _bfd_elf_create_got_section (dynobj, info))
497 return false;
498 break;
499
500 default:
501 break;
502 }
503 }
504
505
506 switch (ELF64_R_TYPE (rel->r_info))
507 {
508 case R_390_GOT12:
509 case R_390_GOT16:
510 case R_390_GOT32:
511 case R_390_GOT64:
512 case R_390_GOTENT:
513 /* This symbol requires a global offset table entry. */
514
515 if (sgot == NULL)
516 {
517 sgot = bfd_get_section_by_name (dynobj, ".got");
518 BFD_ASSERT (sgot != NULL);
519 }
520
521
522 if (srelgot == NULL
523 && (h != NULL || info->shared))
524 {
525 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
526 if (srelgot == NULL)
527 {
528 srelgot = bfd_make_section (dynobj, ".rela.got");
529 if (srelgot == NULL
530 || ! bfd_set_section_flags (dynobj, srelgot,
531 (SEC_ALLOC
532 | SEC_LOAD
533 | SEC_HAS_CONTENTS
534 | SEC_IN_MEMORY
535 | SEC_LINKER_CREATED
536 | SEC_READONLY))
537 || ! bfd_set_section_alignment (dynobj, srelgot, 2))
538 return false;
539 }
540 }
541
542 if (h != NULL)
543 {
51b64d56 544 if (h->got.refcount == 0)
a85d7ed0 545 {
a85d7ed0
NC		 546 /* Make sure this symbol is output as a dynamic symbol. */
547 if (h->dynindx == -1)
548 {
549 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
550 return false;
551 }
99c79b2e 552
a85d7ed0
NC		 553 sgot->_raw_size += 8;
554 srelgot->_raw_size += sizeof (Elf64_External_Rela);
555 }
51b64d56 556 h->got.refcount += 1;
a85d7ed0
NC		 557 }
558 else
559 {
99c79b2e 560 /* This is a global offset table entry for a local symbol. */
a85d7ed0
NC		 561 if (local_got_refcounts == NULL)
562 {
dc810e39 563 bfd_size_type size;
a85d7ed0
NC		 564
565 size = symtab_hdr->sh_info * sizeof (bfd_vma);
dc810e39 566 local_got_refcounts = ((bfd_signed_vma *)
51b64d56 567 bfd_zalloc (abfd, size));
a85d7ed0
NC		 568 if (local_got_refcounts == NULL)
569 return false;
570 elf_local_got_refcounts (abfd) = local_got_refcounts;
a85d7ed0 571 }
51b64d56 572 if (local_got_refcounts[r_symndx] == 0)
a85d7ed0 573 {
a85d7ed0
NC		 574 sgot->_raw_size += 8;
575 if (info->shared)
576 {
577 /* If we are generating a shared object, we need to
578 output a R_390_RELATIVE reloc so that the dynamic
579 linker can adjust this GOT entry. */
580 srelgot->_raw_size += sizeof (Elf64_External_Rela);
581 }
582 }
51b64d56 583 local_got_refcounts[r_symndx] += 1;
a85d7ed0
NC		 584 }
585 break;
586
587 case R_390_PLT16DBL:
588 case R_390_PLT32:
589 case R_390_PLT32DBL:
590 case R_390_PLT64:
591 /* This symbol requires a procedure linkage table entry. We
592 actually build the entry in adjust_dynamic_symbol,
593 because this might be a case of linking PIC code which is
594 never referenced by a dynamic object, in which case we
595 don't need to generate a procedure linkage table entry
596 after all. */
597
598 /* If this is a local symbol, we resolve it directly without
599 creating a procedure linkage table entry. */
600 if (h == NULL)
601 continue;
602
51b64d56
AM		 603 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
604 h->plt.refcount += 1;
a85d7ed0
NC		 605 break;
606
607 case R_390_8:
608 case R_390_16:
609 case R_390_32:
610 case R_390_64:
611 case R_390_PC16:
612 case R_390_PC16DBL:
613 case R_390_PC32:
614 case R_390_PC32DBL:
615 case R_390_PC64:
616 if (h != NULL)
617 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
618
619 /* If we are creating a shared library, and this is a reloc
620 against a global symbol, or a non PC relative reloc
621 against a local symbol, then we need to copy the reloc
622 into the shared library. However, if we are linking with
623 -Bsymbolic, we do not need to copy a reloc against a
624 global symbol which is defined in an object we are
625 including in the link (i.e., DEF_REGULAR is set). At
626 this point we have not seen all the input files, so it is
627 possible that DEF_REGULAR is not set now but will be set
628 later (it is never cleared). We account for that
629 possibility below by storing information in the
630 pcrel_relocs_copied field of the hash table entry. */
631 if (info->shared
632 && (sec->flags & SEC_ALLOC) != 0
633 && (ELF64_R_TYPE (rel->r_info) == R_390_8
99c79b2e 634 || ELF64_R_TYPE (rel->r_info) == R_390_16
a85d7ed0
NC		 635 || ELF64_R_TYPE (rel->r_info) == R_390_32
636 || ELF64_R_TYPE (rel->r_info) == R_390_64
637 || (h != NULL
638 && h->dynindx != -1
639 && (! info->symbolic
640 || (h->elf_link_hash_flags
641 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
642 {
643 /* When creating a shared object, we must copy these
644 reloc types into the output file. We create a reloc
645 section in dynobj and make room for this reloc. */
646 if (sreloc == NULL)
647 {
648 const char *name;
649
650 name = (bfd_elf_string_from_elf_section
651 (abfd,
652 elf_elfheader (abfd)->e_shstrndx,
653 elf_section_data (sec)->rel_hdr.sh_name));
654 if (name == NULL)
655 return false;
656
657 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
658 && strcmp (bfd_get_section_name (abfd, sec),
659 name + 5) == 0);
660
661 sreloc = bfd_get_section_by_name (dynobj, name);
662 if (sreloc == NULL)
663 {
664 flagword flags;
665
666 sreloc = bfd_make_section (dynobj, name);
667 flags = (SEC_HAS_CONTENTS | SEC_READONLY
668 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
669 if ((sec->flags & SEC_ALLOC) != 0)
670 flags |= SEC_ALLOC | SEC_LOAD;
671 if (sreloc == NULL
672 || ! bfd_set_section_flags (dynobj, sreloc, flags)
673 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
674 return false;
675 }
29c2fb7c
AJ		 676 if (sec->flags & SEC_READONLY)
677 info->flags |= DF_TEXTREL;
a85d7ed0
NC		 678 }
679
680 sreloc->_raw_size += sizeof (Elf64_External_Rela);
681
682 /* If we are linking with -Bsymbolic, and this is a
683 global symbol, we count the number of PC relative
684 relocations we have entered for this symbol, so that
685 we can discard them again if the symbol is later
686 defined by a regular object. Note that this function
687 is only called if we are using an elf64_s390 linker
688 hash table, which means that h is really a pointer to
689 an elf64_s390_link_hash_entry. */
690 if (h != NULL
691 && (ELF64_R_TYPE (rel->r_info) == R_390_PC16 ||
692 ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL ||
693 ELF64_R_TYPE (rel->r_info) == R_390_PC32 ||
694 ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL ||
695 ELF64_R_TYPE (rel->r_info) == R_390_PC64))
696 {
697 struct elf_s390_link_hash_entry *eh;
698 struct elf_s390_pcrel_relocs_copied *p;
699
700 eh = (struct elf_s390_link_hash_entry *) h;
701
702 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
703 if (p->section == sreloc)
704 break;
705
706 if (p == NULL)
707 {
708 p = ((struct elf_s390_pcrel_relocs_copied *)
dc810e39 709 bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
a85d7ed0
NC		 710 if (p == NULL)
711 return false;
712 p->next = eh->pcrel_relocs_copied;
713 eh->pcrel_relocs_copied = p;
714 p->section = sreloc;
715 p->count = 0;
716 }
717
718 ++p->count;
719 }
720 }
721
722 break;
723
724 /* This relocation describes the C++ object vtable hierarchy.
725 Reconstruct it for later use during GC. */
726 case R_390_GNU_VTINHERIT:
727 if (!_bfd_elf64_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
728 return false;
729 break;
730
731 /* This relocation describes which C++ vtable entries are actually
732 used. Record for later use during GC. */
733 case R_390_GNU_VTENTRY:
734 if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend))
735 return false;
736 break;
99c79b2e 737
a85d7ed0
NC		 738 default:
739 break;
740 }
741 }
742
743 return true;
744}
745
746/* Return the section that should be marked against GC for a given
747 relocation. */
748
749static asection *
750elf_s390_gc_mark_hook (abfd, info, rel, h, sym)
751 bfd *abfd;
752 struct bfd_link_info *info ATTRIBUTE_UNUSED;
753 Elf_Internal_Rela *rel;
754 struct elf_link_hash_entry *h;
755 Elf_Internal_Sym *sym;
756{
757 if (h != NULL)
758 {
759 switch (ELF64_R_TYPE (rel->r_info))
760 {
761 case R_390_GNU_VTINHERIT:
762 case R_390_GNU_VTENTRY:
763 break;
764
765 default:
766 switch (h->root.type)
767 {
768 case bfd_link_hash_defined:
769 case bfd_link_hash_defweak:
770 return h->root.u.def.section;
771
772 case bfd_link_hash_common:
773 return h->root.u.c.p->section;
774
775 default:
776 break;
777 }
778 }
779 }
780 else
781 {
782 if (!(elf_bad_symtab (abfd)
783 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
784 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
785 && sym->st_shndx != SHN_COMMON))
786 {
787 return bfd_section_from_elf_index (abfd, sym->st_shndx);
788 }
789 }
790
791 return NULL;
792}
793
794/* Update the got entry reference counts for the section being removed. */
795
796static boolean
797elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
798 bfd *abfd ATTRIBUTE_UNUSED;
799 struct bfd_link_info *info ATTRIBUTE_UNUSED;
800 asection *sec ATTRIBUTE_UNUSED;
801 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
802{
803 Elf_Internal_Shdr *symtab_hdr;
804 struct elf_link_hash_entry **sym_hashes;
805 bfd_signed_vma *local_got_refcounts;
806 const Elf_Internal_Rela *rel, *relend;
807 unsigned long r_symndx;
808 struct elf_link_hash_entry *h;
809 bfd *dynobj;
810 asection *sgot;
811 asection *srelgot;
812
813 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
814 sym_hashes = elf_sym_hashes (abfd);
815 local_got_refcounts = elf_local_got_refcounts (abfd);
816
817 dynobj = elf_hash_table (info)->dynobj;
818 if (dynobj == NULL)
819 return true;
820
821 sgot = bfd_get_section_by_name (dynobj, ".got");
822 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
823
824 relend = relocs + sec->reloc_count;
825 for (rel = relocs; rel < relend; rel++)
826 switch (ELF64_R_TYPE (rel->r_info))
827 {
828 case R_390_GOT12:
829 case R_390_GOT16:
830 case R_390_GOT32:
831 case R_390_GOT64:
832 case R_390_GOTOFF:
833 case R_390_GOTPC:
834 case R_390_GOTPCDBL:
835 case R_390_GOTENT:
836 r_symndx = ELF64_R_SYM (rel->r_info);
837 if (r_symndx >= symtab_hdr->sh_info)
838 {
839 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
840 if (h->got.refcount > 0)
841 {
842 h->got.refcount -= 1;
843 if (h->got.refcount == 0)
844 {
845 sgot->_raw_size -= 8;
846 srelgot->_raw_size -= sizeof (Elf64_External_Rela);
847 }
848 }
849 }
850 else if (local_got_refcounts != NULL)
851 {
852 if (local_got_refcounts[r_symndx] > 0)
853 {
854 local_got_refcounts[r_symndx] -= 1;
855 if (local_got_refcounts[r_symndx] == 0)
856 {
857 sgot->_raw_size -= 8;
858 if (info->shared)
859 srelgot->_raw_size -= sizeof (Elf64_External_Rela);
860 }
861 }
862 }
863 break;
864
865 case R_390_PLT16DBL:
866 case R_390_PLT32:
867 case R_390_PLT32DBL:
868 case R_390_PLT64:
869 r_symndx = ELF64_R_SYM (rel->r_info);
870 if (r_symndx >= symtab_hdr->sh_info)
871 {
872 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
873 if (h->plt.refcount > 0)
874 h->plt.refcount -= 1;
875 }
876 break;
877
878 default:
879 break;
880 }
881
882 return true;
883}
884
885/* Adjust a symbol defined by a dynamic object and referenced by a
886 regular object. The current definition is in some section of the
887 dynamic object, but we're not including those sections. We have to
888 change the definition to something the rest of the link can
889 understand. */
890
891static boolean
892elf_s390_adjust_dynamic_symbol (info, h)
893 struct bfd_link_info *info;
894 struct elf_link_hash_entry *h;
895{
896 bfd *dynobj;
897 asection *s;
898 unsigned int power_of_two;
899
900 dynobj = elf_hash_table (info)->dynobj;
901
902 /* Make sure we know what is going on here. */
903 BFD_ASSERT (dynobj != NULL
904 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
905 || h->weakdef != NULL
906 || ((h->elf_link_hash_flags
907 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
908 && (h->elf_link_hash_flags
909 & ELF_LINK_HASH_REF_REGULAR) != 0
910 && (h->elf_link_hash_flags
911 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
912
913 /* If this is a function, put it in the procedure linkage table. We
914 will fill in the contents of the procedure linkage table later
915 (although we could actually do it here). */
916 if (h->type == STT_FUNC
917 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
918 {
919 if ((! info->shared
920 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
921 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0)
922 || (info->shared && h->plt.refcount <= 0))
923 {
924 /* This case can occur if we saw a PLT32 reloc in an input
925 file, but the symbol was never referred to by a dynamic
926 object. In such a case, we don't actually need to build
927 a procedure linkage table, and we can just do a PC32
928 reloc instead. */
929 h->plt.offset = (bfd_vma) -1;
930 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
931 return true;
932 }
933
934 /* Make sure this symbol is output as a dynamic symbol. */
935 if (h->dynindx == -1)
936 {
937 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
938 return false;
939 }
940
941 s = bfd_get_section_by_name (dynobj, ".plt");
942 BFD_ASSERT (s != NULL);
943
944
945 /* The first entry in .plt is reserved. */
946 if (s->_raw_size == 0)
947 s->_raw_size = PLT_FIRST_ENTRY_SIZE;
948
949 /* If this symbol is not defined in a regular file, and we are
950 not generating a shared library, then set the symbol to this
951 location in the .plt. This is required to make function
952 pointers compare as equal between the normal executable and
953 the shared library. */
954 if (! info->shared
955 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
956 {
957 h->root.u.def.section = s;
958 h->root.u.def.value = s->_raw_size;
959 }
960
961 h->plt.offset = s->_raw_size;
962
963 /* Make room for this entry. */
964 s->_raw_size += PLT_ENTRY_SIZE;
965
966 /* We also need to make an entry in the .got.plt section, which
967 will be placed in the .got section by the linker script. */
968 s = bfd_get_section_by_name (dynobj, ".got.plt");
969 BFD_ASSERT (s != NULL);
970 s->_raw_size += GOT_ENTRY_SIZE;
971
972 /* We also need to make an entry in the .rela.plt section. */
973 s = bfd_get_section_by_name (dynobj, ".rela.plt");
974 BFD_ASSERT (s != NULL);
975 s->_raw_size += sizeof (Elf64_External_Rela);
976
977 return true;
978 }
bbd7ec4a
AM		 979 else
980 h->plt.offset = (bfd_vma) -1;
a85d7ed0
NC		 981
982 /* If this is a weak symbol, and there is a real definition, the
983 processor independent code will have arranged for us to see the
984 real definition first, and we can just use the same value. */
985 if (h->weakdef != NULL)
986 {
987 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
988 || h->weakdef->root.type == bfd_link_hash_defweak);
989 h->root.u.def.section = h->weakdef->root.u.def.section;
990 h->root.u.def.value = h->weakdef->root.u.def.value;
991 return true;
992 }
993
994 /* This is a reference to a symbol defined by a dynamic object which
995 is not a function. */
996
997 /* If we are creating a shared library, we must presume that the
998 only references to the symbol are via the global offset table.
999 For such cases we need not do anything here; the relocations will
1000 be handled correctly by relocate_section. */
1001 if (info->shared)
1002 return true;
1003
1004 /* If there are no references to this symbol that do not use the
1005 GOT, we don't need to generate a copy reloc. */
1006 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1007 return true;
1008
1009 /* We must allocate the symbol in our .dynbss section, which will
1010 become part of the .bss section of the executable. There will be
1011 an entry for this symbol in the .dynsym section. The dynamic
1012 object will contain position independent code, so all references
1013 from the dynamic object to this symbol will go through the global
1014 offset table. The dynamic linker will use the .dynsym entry to
1015 determine the address it must put in the global offset table, so
1016 both the dynamic object and the regular object will refer to the
1017 same memory location for the variable. */
1018
1019 s = bfd_get_section_by_name (dynobj, ".dynbss");
1020 BFD_ASSERT (s != NULL);
1021
1022 /* We must generate a R_390_COPY reloc to tell the dynamic linker
1023 to copy the initial value out of the dynamic object and into the
1024 runtime process image. We need to remember the offset into the
1025 .rel.bss section we are going to use. */
1026 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1027 {
1028 asection *srel;
1029
1030 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
1031 BFD_ASSERT (srel != NULL);
1032 srel->_raw_size += sizeof (Elf64_External_Rela);
1033 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1034 }
1035
1036 /* We need to figure out the alignment required for this symbol. I
1037 have no idea how ELF linkers handle this. */
1038 power_of_two = bfd_log2 (h->size);
1039 if (power_of_two > 3)
1040 power_of_two = 3;
1041
1042 /* Apply the required alignment. */
1043 s->_raw_size = BFD_ALIGN (s->_raw_size,
1044 (bfd_size_type) (1 << power_of_two));
1045 if (power_of_two > bfd_get_section_alignment (dynobj, s))
1046 {
1047 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
1048 return false;
1049 }
1050
1051 /* Define the symbol as being at this point in the section. */
1052 h->root.u.def.section = s;
1053 h->root.u.def.value = s->_raw_size;
1054
1055 /* Increment the section size to make room for the symbol. */
1056 s->_raw_size += h->size;
1057
1058 return true;
1059}
1060
1061/* Set the sizes of the dynamic sections. */
1062
1063static boolean
1064elf_s390_size_dynamic_sections (output_bfd, info)
29c2fb7c 1065 bfd *output_bfd ATTRIBUTE_UNUSED;
a85d7ed0
NC		 1066 struct bfd_link_info *info;
1067{
1068 bfd *dynobj;
1069 asection *s;
a85d7ed0
NC		 1070 boolean relocs;
1071 boolean plt;
1072
1073 dynobj = elf_hash_table (info)->dynobj;
1074 BFD_ASSERT (dynobj != NULL);
1075
1076 if (elf_hash_table (info)->dynamic_sections_created)
1077 {
1078 /* Set the contents of the .interp section to the interpreter. */
1079 if (! info->shared)
1080 {
1081 s = bfd_get_section_by_name (dynobj, ".interp");
1082 BFD_ASSERT (s != NULL);
1083 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1084 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1085 }
1086 }
1087 else
1088 {
1089 /* We may have created entries in the .rela.got section.
1090 However, if we are not creating the dynamic sections, we will
1091 not actually use these entries. Reset the size of .rela.got,
1092 which will cause it to get stripped from the output file
1093 below. */
1094 s = bfd_get_section_by_name (dynobj, ".rela.got");
1095 if (s != NULL)
1096 s->_raw_size = 0;
1097 }
1098
1099 /* If this is a -Bsymbolic shared link, then we need to discard all
1100 PC relative relocs against symbols defined in a regular object.
1101 We allocated space for them in the check_relocs routine, but we
1102 will not fill them in in the relocate_section routine. */
1103 if (info->shared)
1104 elf_s390_link_hash_traverse (elf_s390_hash_table (info),
1105 elf_s390_discard_copies,
1106 (PTR) info);
1107
1108 /* The check_relocs and adjust_dynamic_symbol entry points have
1109 determined the sizes of the various dynamic sections. Allocate
1110 memory for them. */
1111 plt = false;
a85d7ed0
NC		 1112 relocs = false;
1113 for (s = dynobj->sections; s != NULL; s = s->next)
1114 {
1115 const char *name;
1116 boolean strip;
1117
1118 if ((s->flags & SEC_LINKER_CREATED) == 0)
1119 continue;
1120
1121 /* It's OK to base decisions on the section name, because none
1122 of the dynobj section names depend upon the input files. */
1123 name = bfd_get_section_name (dynobj, s);
1124
1125 strip = false;
1126
1127 if (strcmp (name, ".plt") == 0)
1128 {
1129 if (s->_raw_size == 0)
1130 {
1131 /* Strip this section if we don't need it; see the
1132 comment below. */
1133 strip = true;
1134 }
1135 else
1136 {
1137 /* Remember whether there is a PLT. */
1138 plt = true;
1139 }
1140 }
1141 else if (strncmp (name, ".rela", 5) == 0)
1142 {
1143 if (s->_raw_size == 0)
1144 {
1145 /* If we don't need this section, strip it from the
1146 output file. This is to handle .rela.bss and
1147 .rel.plt. We must create it in
1148 create_dynamic_sections, because it must be created
1149 before the linker maps input sections to output
1150 sections. The linker does that before
1151 adjust_dynamic_symbol is called, and it is that
1152 function which decides whether anything needs to go
1153 into these sections. */
1154 strip = true;
1155 }
1156 else
1157 {
a85d7ed0
NC		 1158 /* Remember whether there are any reloc sections other
1159 than .rela.plt. */
1160 if (strcmp (name, ".rela.plt") != 0)
29c2fb7c 1161 relocs = true;
a85d7ed0
NC		 1162
1163 /* We use the reloc_count field as a counter if we need
1164 to copy relocs into the output file. */
1165 s->reloc_count = 0;
1166 }
1167 }
1168 else if (strncmp (name, ".got", 4) != 0)
1169 {
1170 /* It's not one of our sections, so don't allocate space. */
1171 continue;
1172 }
1173
1174 if (strip)
1175 {
1176 _bfd_strip_section_from_output (info, s);
1177 continue;
1178 }
1179
1180 /* Allocate memory for the section contents. */
1181 s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size);
1182 if (s->contents == NULL && s->_raw_size != 0)
1183 return false;
1184 }
1185
1186 if (elf_hash_table (info)->dynamic_sections_created)
1187 {
1188 /* Add some entries to the .dynamic section. We fill in the
1189 values later, in elf_s390_finish_dynamic_sections, but we
1190 must add the entries now so that we get the correct size for
1191 the .dynamic section. The DT_DEBUG entry is filled in by the
1192 dynamic linker and used by the debugger. */
dc810e39
AM		 1193#define add_dynamic_entry(TAG, VAL) \
1194 bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1195
a85d7ed0
NC		 1196 if (! info->shared)
1197 {
dc810e39 1198 if (!add_dynamic_entry (DT_DEBUG, 0))
a85d7ed0
NC		 1199 return false;
1200 }
1201
1202 if (plt)
1203 {
dc810e39
AM		 1204 if (!add_dynamic_entry (DT_PLTGOT, 0)
1205 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1206 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1207 || !add_dynamic_entry (DT_JMPREL, 0))
a85d7ed0
NC		 1208 return false;
1209 }
1210
1211 if (relocs)
1212 {
dc810e39
AM		 1213 if (!add_dynamic_entry (DT_RELA, 0)
1214 || !add_dynamic_entry (DT_RELASZ, 0)
1215 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
a85d7ed0
NC		 1216 return false;
1217 }
1218
29c2fb7c 1219 if ((info->flags & DF_TEXTREL) != 0)
a85d7ed0 1220 {
dc810e39 1221 if (!add_dynamic_entry (DT_TEXTREL, 0))
a85d7ed0
NC		 1222 return false;
1223 info->flags |= DF_TEXTREL;
1224 }
1225 }
dc810e39 1226#undef add_dynamic_entry
a85d7ed0
NC		 1227
1228 return true;
1229}
1230
1231/* This function is called via elf64_s390_link_hash_traverse if we are
1232 creating a shared object with -Bsymbolic. It discards the space
1233 allocated to copy PC relative relocs against symbols which are
1234 defined in regular objects. We allocated space for them in the
1235 check_relocs routine, but we won't fill them in in the
1236 relocate_section routine. */
1237
1238/*ARGSUSED*/
1239static boolean
1240elf_s390_discard_copies (h, inf)
1241 struct elf_s390_link_hash_entry *h;
1242 PTR inf;
1243{
1244 struct elf_s390_pcrel_relocs_copied *s;
1245 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1246
1247 /* If a symbol has been forced local or we have found a regular
1248 definition for the symbolic link case, then we won't be needing
1249 any relocs. */
1250 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1251 && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
1252 || info->symbolic))
1253 {
1254 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1255 s->section->_raw_size -= s->count * sizeof (Elf64_External_Rela);
1256 }
1257
1258 return true;
1259}
1260/* Relocate a 390 ELF section. */
1261
1262static boolean
1263elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
1264 contents, relocs, local_syms, local_sections)
1265 bfd *output_bfd;
1266 struct bfd_link_info *info;
1267 bfd *input_bfd;
1268 asection *input_section;
1269 bfd_byte *contents;
1270 Elf_Internal_Rela *relocs;
1271 Elf_Internal_Sym *local_syms;
1272 asection **local_sections;
1273{
1274 bfd *dynobj;
1275 Elf_Internal_Shdr *symtab_hdr;
1276 struct elf_link_hash_entry **sym_hashes;
1277 bfd_vma *local_got_offsets;
1278 asection *sgot;
1279 asection *splt;
1280 asection *sreloc;
1281 Elf_Internal_Rela *rel;
1282 Elf_Internal_Rela *relend;
1283
1284 dynobj = elf_hash_table (info)->dynobj;
1285 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1286 sym_hashes = elf_sym_hashes (input_bfd);
1287 local_got_offsets = elf_local_got_offsets (input_bfd);
1288
1289 sgot = NULL;
1290 splt = NULL;
1291 sreloc = NULL;
1292 if (dynobj != NULL)
1293 {
1294 splt = bfd_get_section_by_name (dynobj, ".plt");
1295 sgot = bfd_get_section_by_name (dynobj, ".got");
1296 }
1297
1298 rel = relocs;
1299 relend = relocs + input_section->reloc_count;
1300 for (; rel < relend; rel++)
1301 {
1302 int r_type;
1303 reloc_howto_type *howto;
1304 unsigned long r_symndx;
1305 struct elf_link_hash_entry *h;
1306 Elf_Internal_Sym *sym;
1307 asection *sec;
1308 bfd_vma relocation;
1309 bfd_reloc_status_type r;
1310
1311 r_type = ELF64_R_TYPE (rel->r_info);
1312 if (r_type == R_390_GNU_VTINHERIT
1313 || r_type == R_390_GNU_VTENTRY)
1314 continue;
1315 if (r_type < 0 || r_type >= (int) R_390_max)
1316 {
1317 bfd_set_error (bfd_error_bad_value);
1318 return false;
1319 }
1320 howto = elf_howto_table + r_type;
1321
1322 r_symndx = ELF64_R_SYM (rel->r_info);
1323
1324 if (info->relocateable)
1325 {
1326 /* This is a relocateable link. We don't have to change
1327 anything, unless the reloc is against a section symbol,
1328 in which case we have to adjust according to where the
1329 section symbol winds up in the output section. */
1330 if (r_symndx < symtab_hdr->sh_info)
1331 {
1332 sym = local_syms + r_symndx;
1333 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1334 {
1335 sec = local_sections[r_symndx];
1336 rel->r_addend += sec->output_offset + sym->st_value;
1337 }
1338 }
1339
1340 continue;
1341 }
1342
1343 /* This is a final link. */
1344 h = NULL;
1345 sym = NULL;
1346 sec = NULL;
1347 if (r_symndx < symtab_hdr->sh_info)
1348 {
1349 sym = local_syms + r_symndx;
1350 sec = local_sections[r_symndx];
1351 relocation = (sec->output_section->vma
1352 + sec->output_offset
1353 + sym->st_value);
1354 }
1355 else
1356 {
1357 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1358 while (h->root.type == bfd_link_hash_indirect
1359 || h->root.type == bfd_link_hash_warning)
1360 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1361 if (h->root.type == bfd_link_hash_defined
1362 || h->root.type == bfd_link_hash_defweak)
1363 {
1364 sec = h->root.u.def.section;
1365 if ((r_type == R_390_GOTPC
1366 || r_type == R_390_GOTPCDBL)
1367 || ((r_type == R_390_PLT16DBL ||
1368 r_type == R_390_PLT32 ||
1369 r_type == R_390_PLT32DBL ||
1370 r_type == R_390_PLT64)
1371 && splt != NULL
1372 && h->plt.offset != (bfd_vma) -1)
1373 || ((r_type == R_390_GOT12 ||
1374 r_type == R_390_GOT16 ||
1375 r_type == R_390_GOT32 ||
1376 r_type == R_390_GOT64 ||
1377 r_type == R_390_GOTENT)
1378 && elf_hash_table (info)->dynamic_sections_created
1379 && (! info->shared
1380 || (! info->symbolic && h->dynindx != -1)
1381 || (h->elf_link_hash_flags
1382 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1383 || (info->shared
1384 && ((! info->symbolic && h->dynindx != -1)
1385 || (h->elf_link_hash_flags
1386 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1387 && ( r_type == R_390_8 ||
1388 r_type == R_390_16 ||
1389 r_type == R_390_32 ||
1390 r_type == R_390_64 ||
1391 r_type == R_390_PC16 ||
1392 r_type == R_390_PC16DBL ||
1393 r_type == R_390_PC32 ||
1394 r_type == R_390_PC32DBL ||
1395 r_type == R_390_PC64)
1396 && ((input_section->flags & SEC_ALLOC) != 0
1397 /* DWARF will emit R_386_32 relocations in its
1398 sections against symbols defined externally
1399 in shared libraries. We can't do anything
1400 with them here. */
1401 || ((input_section->flags & SEC_DEBUGGING) != 0
1402 && (h->elf_link_hash_flags
1403 & ELF_LINK_HASH_DEF_DYNAMIC) != 0))))
1404 {
1405 /* In these cases, we don't need the relocation
1406 value. We check specially because in some
1407 obscure cases sec->output_section will be NULL. */
1408 relocation = 0;
1409 }
1410 else if (sec->output_section == NULL)
1411 {
1412 (*_bfd_error_handler)
1413 (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
8f615d07 1414 bfd_archive_filename (input_bfd), h->root.root.string,
a85d7ed0
NC		 1415 bfd_get_section_name (input_bfd, input_section));
1416 relocation = 0;
1417 }
1418 else
1419 relocation = (h->root.u.def.value
1420 + sec->output_section->vma
1421 + sec->output_offset);
1422 }
1423 else if (h->root.type == bfd_link_hash_undefweak)
1424 relocation = 0;
671bae9c
NC		 1425 else if (info->shared
1426 && (!info->symbolic || info->allow_shlib_undefined)
a85d7ed0
NC		 1427 && !info->no_undefined
1428 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1429 relocation = 0;
1430 else
1431 {
1432 if (! ((*info->callbacks->undefined_symbol)
1433 (info, h->root.root.string, input_bfd,
99c79b2e
AJ		 1434 input_section, rel->r_offset,
1435 (!info->shared || info->no_undefined
a85d7ed0
NC		 1436 || ELF_ST_VISIBILITY (h->other)))))
1437 return false;
1438 relocation = 0;
1439 }
1440 }
1441
1442 switch (r_type)
1443 {
1444 case R_390_GOT12:
1445 case R_390_GOT16:
1446 case R_390_GOT32:
1447 case R_390_GOT64:
1448 case R_390_GOTENT:
1449 /* Relocation is to the entry for this symbol in the global
1450 offset table. */
1451 BFD_ASSERT (sgot != NULL);
1452
1453 if (h != NULL)
1454 {
1455 bfd_vma off;
1456
1457 off = h->got.offset;
1458 BFD_ASSERT (off != (bfd_vma) -1);
1459
1460 if (! elf_hash_table (info)->dynamic_sections_created
1461 || (info->shared
1462 && (info->symbolic || h->dynindx == -1)
1463 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1464 {
1465 /* This is actually a static link, or it is a
1466 -Bsymbolic link and the symbol is defined
1467 locally, or the symbol was forced to be local
1468 because of a version file. We must initialize
1469 this entry in the global offset table. Since the
1470 offset must always be a multiple of 2, we use the
1471 least significant bit to record whether we have
1472 initialized it already.
1473
1474 When doing a dynamic link, we create a .rel.got
1475 relocation entry to initialize the value. This
1476 is done in the finish_dynamic_symbol routine. */
1477 if ((off & 1) != 0)
1478 off &= ~1;
1479 else
1480 {
1481 bfd_put_64 (output_bfd, relocation,
1482 sgot->contents + off);
1483 h->got.offset |= 1;
1484 }
1485 }
1486 relocation = sgot->output_offset + off;
1487 }
1488 else
1489 {
1490 bfd_vma off;
1491
1492 BFD_ASSERT (local_got_offsets != NULL
1493 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1494
1495 off = local_got_offsets[r_symndx];
1496
1497 /* The offset must always be a multiple of 8. We use
1498 the least significant bit to record whether we have
1499 already generated the necessary reloc. */
1500 if ((off & 1) != 0)
1501 off &= ~1;
1502 else
1503 {
1504 bfd_put_64 (output_bfd, relocation, sgot->contents + off);
1505
1506 if (info->shared)
1507 {
1508 asection *srelgot;
1509 Elf_Internal_Rela outrel;
1510
1511 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1512 BFD_ASSERT (srelgot != NULL);
1513
1514 outrel.r_offset = (sgot->output_section->vma
1515 + sgot->output_offset
1516 + off);
1517 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
1518 outrel.r_addend = relocation;
1519 bfd_elf64_swap_reloca_out (output_bfd, &outrel,
1520 (((Elf64_External_Rela *)
1521 srelgot->contents)
1522 + srelgot->reloc_count));
1523 ++srelgot->reloc_count;
1524 }
1525
1526 local_got_offsets[r_symndx] |= 1;
1527 }
1528
1529 relocation = sgot->output_offset + off;
1530 }
1531
1532 /*
1533 * For @GOTENT the relocation is against the offset between
1534 * the instruction and the symbols entry in the GOT and not
1535 * between the start of the GOT and the symbols entry. We
1536 * add the vma of the GOT to get the correct value.
1537 */
1538 if (r_type == R_390_GOTENT)
1539 relocation += sgot->output_section->vma;
1540
1541 break;
99c79b2e 1542
a85d7ed0
NC		 1543 case R_390_GOTOFF:
1544 /* Relocation is relative to the start of the global offset
1545 table. */
1546
1547 if (sgot == NULL)
1548 {
1549 sgot = bfd_get_section_by_name (dynobj, ".got");
1550 BFD_ASSERT (sgot != NULL);
1551 }
1552
1553 /* Note that sgot->output_offset is not involved in this
1554 calculation. We always want the start of .got. If we
1555 defined _GLOBAL_OFFSET_TABLE in a different way, as is
1556 permitted by the ABI, we might have to change this
1557 calculation. */
1558 relocation -= sgot->output_section->vma;
1559
1560 break;
1561
1562 case R_390_GOTPC:
1563 case R_390_GOTPCDBL:
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 case R_390_PLT32DBL:
1579 case R_390_PLT64:
1580 /* Relocation is to the entry for this symbol in the
1581 procedure linkage table. */
1582
1583 /* Resolve a PLT32 reloc against a local symbol directly,
1584 without using the procedure linkage table. */
1585 if (h == NULL)
1586 break;
1587
1588 if (h->plt.offset == (bfd_vma) -1 || splt == NULL)
1589 {
1590 /* We didn't make a PLT entry for this symbol. This
1591 happens when statically linking PIC code, or when
1592 using -Bsymbolic. */
1593 break;
1594 }
1595
1596 relocation = (splt->output_section->vma
1597 + splt->output_offset
1598 + h->plt.offset);
1599
1600 break;
1601
1602 case R_390_8:
1603 case R_390_16:
1604 case R_390_32:
1605 case R_390_64:
1606 case R_390_PC16:
1607 case R_390_PC16DBL:
1608 case R_390_PC32:
1609 case R_390_PC32DBL:
1610 case R_390_PC64:
1611 if (info->shared
1612 && (input_section->flags & SEC_ALLOC) != 0
1613 && (r_type == R_390_8
1614 || r_type == R_390_16
1615 || r_type == R_390_32
1616 || r_type == R_390_64
1617 || (h != NULL
1618 && h->dynindx != -1
1619 && (! info->symbolic
1620 || (h->elf_link_hash_flags
1621 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1622 {
1623 Elf_Internal_Rela outrel;
1624 boolean skip, relocate;
1625
1626 /* When generating a shared object, these relocations
1627 are copied into the output file to be resolved at run
1628 time. */
1629
1630 if (sreloc == NULL)
1631 {
1632 const char *name;
1633
1634 name = (bfd_elf_string_from_elf_section
1635 (input_bfd,
1636 elf_elfheader (input_bfd)->e_shstrndx,
1637 elf_section_data (input_section)->rel_hdr.sh_name));
1638 if (name == NULL)
1639 return false;
1640
1641 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1642 && strcmp (bfd_get_section_name (input_bfd,
1643 input_section),
1644 name + 5) == 0);
1645
1646 sreloc = bfd_get_section_by_name (dynobj, name);
1647 BFD_ASSERT (sreloc != NULL);
1648 }
1649
1650 skip = false;
1651
1652 if (elf_section_data (input_section)->stab_info == NULL)
1653 outrel.r_offset = rel->r_offset;
1654 else
1655 {
1656 bfd_vma off;
1657
1658 off = (_bfd_stab_section_offset
1659 (output_bfd, &elf_hash_table (info)->stab_info,
1660 input_section,
1661 &elf_section_data (input_section)->stab_info,
1662 rel->r_offset));
1663 if (off == (bfd_vma) -1)
1664 skip = true;
1665 outrel.r_offset = off;
1666 }
1667
1668 outrel.r_offset += (input_section->output_section->vma
1669 + input_section->output_offset);
1670
1671 if (skip)
1672 {
1673 memset (&outrel, 0, sizeof outrel);
1674 relocate = false;
1675 }
1676 else if (r_type == R_390_PC16 ||
1677 r_type == R_390_PC16DBL ||
99c79b2e 1678 r_type == R_390_PC32 ||
a85d7ed0
NC		 1679 r_type == R_390_PC32DBL ||
1680 r_type == R_390_PC64)
1681 {
1682 BFD_ASSERT (h != NULL && h->dynindx != -1);
1683 relocate = false;
1684 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
1685 outrel.r_addend = relocation + rel->r_addend;
1686 }
1687 else
1688 {
1689 /* h->dynindx may be -1 if this symbol was marked to
1690 become local. */
1691 if (h == NULL
1692 || ((info->symbolic || h->dynindx == -1)
1693 && (h->elf_link_hash_flags
1694 & ELF_LINK_HASH_DEF_REGULAR) != 0))
1695 {
1696 relocate = true;
1697 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
1698 outrel.r_addend = relocation + rel->r_addend;
1699 }
1700 else
1701 {
1702 BFD_ASSERT (h->dynindx != -1);
1703 relocate = false;
1704 outrel.r_info = ELF64_R_INFO (h->dynindx, R_390_64);
1705 outrel.r_addend = relocation + rel->r_addend;
1706 }
1707 }
1708
1709 bfd_elf64_swap_reloca_out (output_bfd, &outrel,
1710 (((Elf64_External_Rela *)
1711 sreloc->contents)
1712 + sreloc->reloc_count));
1713 ++sreloc->reloc_count;
1714
1715 /* If this reloc is against an external symbol, we do
1716 not want to fiddle with the addend. Otherwise, we
1717 need to include the symbol value so that it becomes
1718 an addend for the dynamic reloc. */
1719 if (! relocate)
1720 continue;
1721 }
1722
1723 break;
1724
1725 default:
1726 break;
1727 }
1728
1729 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
1730 contents, rel->r_offset,
1731 relocation, rel->r_addend);
1732
1733 if (r != bfd_reloc_ok)
1734 {
1735 switch (r)
1736 {
1737 default:
1738 case bfd_reloc_outofrange:
1739 abort ();
1740 case bfd_reloc_overflow:
1741 {
1742 const char *name;
1743
1744 if (h != NULL)
1745 name = h->root.root.string;
1746 else
1747 {
1748 name = bfd_elf_string_from_elf_section (input_bfd,
1749 symtab_hdr->sh_link,
1750 sym->st_name);
1751 if (name == NULL)
1752 return false;
1753 if (*name == '\0')
1754 name = bfd_section_name (input_bfd, sec);
1755 }
1756 if (! ((*info->callbacks->reloc_overflow)
1757 (info, name, howto->name, (bfd_vma) 0,
1758 input_bfd, input_section, rel->r_offset)))
1759 return false;
1760 }
1761 break;
1762 }
1763 }
1764 }
1765
1766 return true;
1767}
1768
1769/* Finish up dynamic symbol handling. We set the contents of various
1770 dynamic sections here. */
1771
1772static boolean
1773elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
1774 bfd *output_bfd;
1775 struct bfd_link_info *info;
1776 struct elf_link_hash_entry *h;
1777 Elf_Internal_Sym *sym;
1778{
1779 bfd *dynobj;
1780
1781 dynobj = elf_hash_table (info)->dynobj;
1782
1783 if (h->plt.offset != (bfd_vma) -1)
1784 {
1785 asection *splt;
1786 asection *srela;
1787 Elf_Internal_Rela rela;
1788 bfd_vma got_offset;
1789 bfd_vma plt_index;
1790 asection *sgot;
1791
1792 /* This symbol has an entry in the procedure linkage table. Set
1793 it up. */
1794
1795 BFD_ASSERT (h->dynindx != -1);
1796
1797 splt = bfd_get_section_by_name (dynobj, ".plt");
1798 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1799 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1800 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1801
99c79b2e 1802 /* Calc. index no.
a85d7ed0
NC		 1803 Current offset - size first entry / entry size. */
1804 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
1805
1806 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
1807 addr & GOT addr. */
1808 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
1809
1810 /* Fill in the blueprint of a PLT. */
1811 bfd_put_32 (output_bfd, PLT_ENTRY_WORD0,
1812 splt->contents + h->plt.offset);
1813 bfd_put_32 (output_bfd, PLT_ENTRY_WORD1,
1814 splt->contents + h->plt.offset + 4);
1815 bfd_put_32 (output_bfd, PLT_ENTRY_WORD2,
1816 splt->contents + h->plt.offset + 8);
1817 bfd_put_32 (output_bfd, PLT_ENTRY_WORD3,
1818 splt->contents + h->plt.offset + 12);
1819 bfd_put_32 (output_bfd, PLT_ENTRY_WORD4,
1820 splt->contents + h->plt.offset + 16);
1821 bfd_put_32 (output_bfd, PLT_ENTRY_WORD5,
1822 splt->contents + h->plt.offset + 20);
1823 bfd_put_32 (output_bfd, PLT_ENTRY_WORD6,
1824 splt->contents + h->plt.offset + 24);
1825 bfd_put_32 (output_bfd, PLT_ENTRY_WORD7,
1826 splt->contents + h->plt.offset + 28);
1827 /* Fixup the relative address to the GOT entry */
1828 bfd_put_32 (output_bfd,
1829 (sgot->output_section->vma + sgot->output_offset + got_offset
1830 - (splt->output_section->vma + h->plt.offset))/2,
1831 splt->contents + h->plt.offset + 2);
1832 /* Fixup the relative branch to PLT 0 */
1833 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
1834 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
1835 splt->contents + h->plt.offset + 24);
1836 /* Fixup offset into symbol table */
1837 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
1838 splt->contents + h->plt.offset + 28);
1839
1840 /* Fill in the entry in the .rela.plt section. */
1841 rela.r_offset = (sgot->output_section->vma
1842 + sgot->output_offset
1843 + got_offset);
1844 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
1845 rela.r_addend = 0;
1846 bfd_elf64_swap_reloca_out (output_bfd, &rela,
1847 ((Elf64_External_Rela *) srela->contents
1848 + plt_index ));
1849
1850 /* Fill in the entry in the global offset table.
1851 Points to instruction after GOT offset. */
1852 bfd_put_64 (output_bfd,
1853 (splt->output_section->vma
1854 + splt->output_offset
1855 + h->plt.offset
1856 + 14),
1857 sgot->contents + got_offset);
1858
1859
1860 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1861 {
1862 /* Mark the symbol as undefined, rather than as defined in
1863 the .plt section. Leave the value alone. */
1864 sym->st_shndx = SHN_UNDEF;
1865 }
1866 }
1867
1868 if (h->got.offset != (bfd_vma) -1)
1869 {
1870 asection *sgot;
1871 asection *srela;
1872 Elf_Internal_Rela rela;
1873
1874 /* This symbol has an entry in the global offset table. Set it
1875 up. */
1876
1877 sgot = bfd_get_section_by_name (dynobj, ".got");
1878 srela = bfd_get_section_by_name (dynobj, ".rela.got");
1879 BFD_ASSERT (sgot != NULL && srela != NULL);
1880
1881 rela.r_offset = (sgot->output_section->vma
1882 + sgot->output_offset
dc810e39 1883 + (h->got.offset &~ (bfd_vma) 1));
a85d7ed0
NC		 1884
1885 /* If this is a static link, or it is a -Bsymbolic link and the
1886 symbol is defined locally or was forced to be local because
1887 of a version file, we just want to emit a RELATIVE reloc.
1888 The entry in the global offset table will already have been
1889 initialized in the relocate_section function. */
1890 if (! elf_hash_table (info)->dynamic_sections_created
1891 || (info->shared
1892 && (info->symbolic || h->dynindx == -1)
1893 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1894 {
1895 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
1896 rela.r_addend = (h->root.u.def.value
1897 + h->root.u.def.section->output_section->vma
1898 + h->root.u.def.section->output_offset);
1899 }
1900 else
1901 {
1902 BFD_ASSERT((h->got.offset & 1) == 0);
1903 bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
1904 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
1905 rela.r_addend = 0;
1906 }
1907
1908 bfd_elf64_swap_reloca_out (output_bfd, &rela,
1909 ((Elf64_External_Rela *) srela->contents
1910 + srela->reloc_count));
1911 ++srela->reloc_count;
1912 }
1913
1914 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1915 {
1916 asection *s;
1917 Elf_Internal_Rela rela;
1918
1919 /* This symbols needs a copy reloc. Set it up. */
1920
1921 BFD_ASSERT (h->dynindx != -1
1922 && (h->root.type == bfd_link_hash_defined
1923 || h->root.type == bfd_link_hash_defweak));
1924
1925
1926 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1927 ".rela.bss");
1928 BFD_ASSERT (s != NULL);
1929
1930 rela.r_offset = (h->root.u.def.value
1931 + h->root.u.def.section->output_section->vma
1932 + h->root.u.def.section->output_offset);
1933 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
1934 rela.r_addend = 0;
1935 bfd_elf64_swap_reloca_out (output_bfd, &rela,
1936 ((Elf64_External_Rela *) s->contents
1937 + s->reloc_count));
1938 ++s->reloc_count;
1939 }
1940
1941 /* Mark some specially defined symbols as absolute. */
1942 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1943 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
1944 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
1945 sym->st_shndx = SHN_ABS;
1946
1947 return true;
1948}
1949
1950/* Finish up the dynamic sections. */
1951
1952static boolean
1953elf_s390_finish_dynamic_sections (output_bfd, info)
1954 bfd *output_bfd;
1955 struct bfd_link_info *info;
1956{
1957 bfd *dynobj;
1958 asection *sdyn;
1959 asection *sgot;
1960
1961 dynobj = elf_hash_table (info)->dynobj;
1962
1963 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1964 BFD_ASSERT (sgot != NULL);
1965 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1966
1967 if (elf_hash_table (info)->dynamic_sections_created)
1968 {
1969 asection *splt;
1970 Elf64_External_Dyn *dyncon, *dynconend;
1971
1972 BFD_ASSERT (sdyn != NULL);
1973
1974 dyncon = (Elf64_External_Dyn *) sdyn->contents;
1975 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
1976 for (; dyncon < dynconend; dyncon++)
1977 {
1978 Elf_Internal_Dyn dyn;
1979 const char *name;
1980 asection *s;
1981
1982 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
1983
1984 switch (dyn.d_tag)
1985 {
1986 default:
1987 break;
1988
1989 case DT_PLTGOT:
1990 name = ".got";
1991 goto get_vma;
1992 case DT_JMPREL:
1993 name = ".rela.plt";
1994 get_vma:
1995 s = bfd_get_section_by_name(output_bfd, name);
1996 BFD_ASSERT (s != NULL);
1997 dyn.d_un.d_ptr = s->vma;
1998 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
1999 break;
2000
2001 case DT_PLTRELSZ:
2002 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2003 BFD_ASSERT (s != NULL);
2004 if (s->_cooked_size != 0)
2005 dyn.d_un.d_val = s->_cooked_size;
2006 else
2007 dyn.d_un.d_val = s->_raw_size;
2008 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
2009 break;
2010
2011 case DT_RELASZ:
2012 /* The procedure linkage table relocs (DT_JMPREL) should
2013 not be included in the overall relocs (DT_RELA).
2014 Therefore, we override the DT_RELASZ entry here to
2015 make it not include the JMPREL relocs. Since the
2016 linker script arranges for .rela.plt to follow all
2017 other relocation sections, we don't have to worry
2018 about changing the DT_RELA entry. */
2019 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
2020 if (s != NULL)
2021 {
2022 if (s->_cooked_size != 0)
2023 dyn.d_un.d_val -= s->_cooked_size;
2024 else
2025 dyn.d_un.d_val -= s->_raw_size;
2026 }
2027 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
2028 break;
2029 }
2030 }
2031
2032 /* Fill in the special first entry in the procedure linkage table. */
2033 splt = bfd_get_section_by_name (dynobj, ".plt");
2034 if (splt && splt->_raw_size > 0)
2035 {
2036 /* fill in blueprint for plt 0 entry */
2037 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD0,
2038 splt->contents );
2039 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD1,
2040 splt->contents +4 );
2041 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD3,
2042 splt->contents +12 );
2043 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD4,
2044 splt->contents +16 );
2045 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD5,
2046 splt->contents +20 );
2047 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD6,
2048 splt->contents + 24);
2049 bfd_put_32 (output_bfd, PLT_FIRST_ENTRY_WORD7,
2050 splt->contents + 28 );
2051 /* Fixup relative address to start of GOT */
2052 bfd_put_32 (output_bfd,
2053 (sgot->output_section->vma + sgot->output_offset
2054 - splt->output_section->vma - 6)/2,
2055 splt->contents + 8);
2056 }
2057
99c79b2e 2058 elf_section_data (splt->output_section)->this_hdr.sh_entsize =
a85d7ed0
NC		 2059 PLT_ENTRY_SIZE;
2060 }
2061
2062 /* Set the first entry in the global offset table to the address of
2063 the dynamic section. */
2064 if (sgot->_raw_size > 0)
2065 {
2066 if (sdyn == NULL)
2067 bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents);
2068 else
2069 bfd_put_64 (output_bfd,
2070 sdyn->output_section->vma + sdyn->output_offset,
2071 sgot->contents);
2072
2073 /* One entry for shared object struct ptr. */
2074 bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
2075 /* One entry for _dl_runtime_resolve. */
2076 bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + 12);
2077 }
2078
2079 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 8;
2080
2081 return true;
2082}
2083
2084static boolean
2085elf_s390_object_p (abfd)
2086 bfd *abfd;
2087{
2088 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_esame);
2089}
2090
29c2fb7c
AJ		 2091
2092static enum elf_reloc_type_class
f51e552e
AM		 2093elf_s390_reloc_type_class (rela)
2094 const Elf_Internal_Rela *rela;
29c2fb7c 2095{
f51e552e 2096 switch ((int) ELF64_R_TYPE (rela->r_info))
29c2fb7c
AJ		 2097 {
2098 case R_390_RELATIVE:
2099 return reloc_class_relative;
2100 case R_390_JMP_SLOT:
2101 return reloc_class_plt;
2102 case R_390_COPY:
2103 return reloc_class_copy;
2104 default:
2105 return reloc_class_normal;
2106 }
2107}
2108
a85d7ed0
NC		 2109/*
2110 * Why was the hash table entry size definition changed from
2111 * ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
2112 * this is the only reason for the s390_elf64_size_info structure.
2113 */
2114
2115const struct elf_size_info s390_elf64_size_info =
2116{
2117 sizeof (Elf64_External_Ehdr),
2118 sizeof (Elf64_External_Phdr),
2119 sizeof (Elf64_External_Shdr),
2120 sizeof (Elf64_External_Rel),
2121 sizeof (Elf64_External_Rela),
2122 sizeof (Elf64_External_Sym),
2123 sizeof (Elf64_External_Dyn),
2124 sizeof (Elf_External_Note),
2125 8, /* hash-table entry size */
2126 1, /* internal relocations per external relocations */
2127 64, /* arch_size */
2128 8, /* file_align */
2129 ELFCLASS64, EV_CURRENT,
2130 bfd_elf64_write_out_phdrs,
2131 bfd_elf64_write_shdrs_and_ehdr,
2132 bfd_elf64_write_relocs,
2133 bfd_elf64_swap_symbol_out,
2134 bfd_elf64_slurp_reloc_table,
2135 bfd_elf64_slurp_symbol_table,
2136 bfd_elf64_swap_dyn_in,
2137 bfd_elf64_swap_dyn_out,
2138 NULL,
2139 NULL,
2140 NULL,
2141 NULL
2142};
2143
2144#define TARGET_BIG_SYM bfd_elf64_s390_vec
2145#define TARGET_BIG_NAME "elf64-s390"
2146#define ELF_ARCH bfd_arch_s390
2147#define ELF_MACHINE_CODE EM_S390
2148#define ELF_MACHINE_ALT1 EM_S390_OLD
2149#define ELF_MAXPAGESIZE 0x1000
2150
2151#define elf_backend_size_info s390_elf64_size_info
2152
2153#define elf_backend_can_gc_sections 1
51b64d56 2154#define elf_backend_can_refcount 1
a85d7ed0
NC		 2155#define elf_backend_want_got_plt 1
2156#define elf_backend_plt_readonly 1
2157#define elf_backend_want_plt_sym 0
2158#define elf_backend_got_header_size 24
2159#define elf_backend_plt_header_size PLT_ENTRY_SIZE
2160
2161#define elf_info_to_howto elf_s390_info_to_howto
2162
2163#define bfd_elf64_bfd_final_link _bfd_elf64_gc_common_final_link
2164#define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
2165#define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
2166#define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
2167
2168#define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
2169#define elf_backend_check_relocs elf_s390_check_relocs
2170#define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
2171#define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
2172#define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
2173#define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
2174#define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
2175#define elf_backend_relocate_section elf_s390_relocate_section
2176#define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
29c2fb7c 2177#define elf_backend_reloc_type_class elf_s390_reloc_type_class
a85d7ed0
NC		 2178
2179#define elf_backend_object_p elf_s390_object_p
2180
2181#include "elf64-target.h"
GDB Binutils - Deliverables
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