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[deliverable/binutils-gdb.git] / bfd / elf64-s390.c
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1/* IBM S/390-specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005
3 Free Software Foundation, Inc.
4 Contributed Martin Schwidefsky (schwidefsky@de.ibm.com).
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23#include "bfd.h"
24#include "sysdep.h"
25#include "bfdlink.h"
26#include "libbfd.h"
27#include "elf-bfd.h"
28
29static reloc_howto_type *elf_s390_reloc_type_lookup
30 PARAMS ((bfd *, bfd_reloc_code_real_type));
31static void elf_s390_info_to_howto
32 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
33static bfd_boolean elf_s390_is_local_label_name
34 PARAMS ((bfd *, const char *));
35static struct bfd_hash_entry *link_hash_newfunc
36 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
37static struct bfd_link_hash_table *elf_s390_link_hash_table_create
38 PARAMS ((bfd *));
39static bfd_boolean create_got_section
40 PARAMS((bfd *, struct bfd_link_info *));
41static bfd_boolean elf_s390_create_dynamic_sections
42 PARAMS((bfd *, struct bfd_link_info *));
43static void elf_s390_copy_indirect_symbol
44 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *,
45 struct elf_link_hash_entry *));
46static bfd_boolean elf_s390_check_relocs
47 PARAMS ((bfd *, struct bfd_link_info *, asection *,
48 const Elf_Internal_Rela *));
49static asection *elf_s390_gc_mark_hook
50 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
51 struct elf_link_hash_entry *, Elf_Internal_Sym *));
52static bfd_boolean elf_s390_gc_sweep_hook
53 PARAMS ((bfd *, struct bfd_link_info *, asection *,
54 const Elf_Internal_Rela *));
55struct elf_s390_link_hash_entry;
56static void elf_s390_adjust_gotplt
57 PARAMS ((struct elf_s390_link_hash_entry *));
58static bfd_boolean elf_s390_adjust_dynamic_symbol
59 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
60static bfd_boolean allocate_dynrelocs
61 PARAMS ((struct elf_link_hash_entry *, PTR));
62static bfd_boolean readonly_dynrelocs
63 PARAMS ((struct elf_link_hash_entry *, PTR));
64static bfd_boolean elf_s390_size_dynamic_sections
65 PARAMS ((bfd *, struct bfd_link_info *));
66static bfd_boolean elf_s390_relocate_section
67 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
68 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
69static bfd_boolean elf_s390_finish_dynamic_symbol
70 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
71 Elf_Internal_Sym *));
72static enum elf_reloc_type_class elf_s390_reloc_type_class
73 PARAMS ((const Elf_Internal_Rela *));
74static bfd_boolean elf_s390_finish_dynamic_sections
75 PARAMS ((bfd *, struct bfd_link_info *));
76static bfd_boolean elf_s390_mkobject
77 PARAMS ((bfd *));
78static bfd_boolean elf_s390_object_p
79 PARAMS ((bfd *));
80static int elf_s390_tls_transition
81 PARAMS ((struct bfd_link_info *, int, int));
82static bfd_reloc_status_type s390_tls_reloc
83 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
84static bfd_vma dtpoff_base
85 PARAMS ((struct bfd_link_info *));
86static bfd_vma tpoff
87 PARAMS ((struct bfd_link_info *, bfd_vma));
88static void invalid_tls_insn
89 PARAMS ((bfd *, asection *, Elf_Internal_Rela *));
90static bfd_reloc_status_type s390_elf_ldisp_reloc
91 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
92
93#include "elf/s390.h"
94
95/* In case we're on a 32-bit machine, construct a 64-bit "-1" value
96 from smaller values. Start with zero, widen, *then* decrement. */
97#define MINUS_ONE (((bfd_vma)0) - 1)
98
99/* The relocation "howto" table. */
100static reloc_howto_type elf_howto_table[] =
101{
102 HOWTO (R_390_NONE, /* type */
103 0, /* rightshift */
104 0, /* size (0 = byte, 1 = short, 2 = long) */
105 0, /* bitsize */
106 FALSE, /* pc_relative */
107 0, /* bitpos */
108 complain_overflow_dont, /* complain_on_overflow */
109 bfd_elf_generic_reloc, /* special_function */
110 "R_390_NONE", /* name */
111 FALSE, /* partial_inplace */
112 0, /* src_mask */
113 0, /* dst_mask */
114 FALSE), /* pcrel_offset */
115
116 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
118 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
119 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
120 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
122 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
124 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
126 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
128 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
130 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
132 HOWTO(R_390_COPY, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,MINUS_ONE, FALSE),
134 HOWTO(R_390_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
135 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,MINUS_ONE, FALSE),
136 HOWTO(R_390_JMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
137 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,MINUS_ONE, FALSE),
138 HOWTO(R_390_RELATIVE, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,MINUS_ONE, FALSE),
140 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,MINUS_ONE, FALSE),
142 HOWTO(R_390_GOTPC, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
143 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,MINUS_ONE, TRUE),
144 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
146 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
148 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
150 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
152 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
153 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
154 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
155 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
156 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
157 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,MINUS_ONE, TRUE),
158 HOWTO(R_390_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
159 bfd_elf_generic_reloc, "R_390_64", FALSE, 0,MINUS_ONE, FALSE),
160 HOWTO(R_390_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
161 bfd_elf_generic_reloc, "R_390_PC64", FALSE, 0,MINUS_ONE, TRUE),
162 HOWTO(R_390_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
163 bfd_elf_generic_reloc, "R_390_GOT64", FALSE, 0,MINUS_ONE, FALSE),
164 HOWTO(R_390_PLT64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
165 bfd_elf_generic_reloc, "R_390_PLT64", FALSE, 0,MINUS_ONE, TRUE),
166 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
167 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,MINUS_ONE, TRUE),
168 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
169 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
170 HOWTO(R_390_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
171 bfd_elf_generic_reloc, "R_390_GOTOFF64", FALSE, 0,MINUS_ONE, FALSE),
172 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
173 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
174 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
175 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
176 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
177 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
178 HOWTO(R_390_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
179 bfd_elf_generic_reloc, "R_390_GOTPLT64", FALSE, 0,MINUS_ONE, FALSE),
180 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
181 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,MINUS_ONE, TRUE),
182 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
183 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
184 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
185 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
186 HOWTO(R_390_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
187 bfd_elf_generic_reloc, "R_390_PLTOFF64", FALSE, 0,MINUS_ONE, FALSE),
188 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont,
189 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE),
190 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
191 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE),
192 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
193 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE),
194 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */
195 HOWTO(R_390_TLS_GD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
196 bfd_elf_generic_reloc, "R_390_TLS_GD64", FALSE, 0, MINUS_ONE, FALSE),
197 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
198 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE),
199 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */
200 HOWTO(R_390_TLS_GOTIE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
201 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", FALSE, 0, MINUS_ONE, FALSE),
202 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */
203 HOWTO(R_390_TLS_LDM64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
204 bfd_elf_generic_reloc, "R_390_TLS_LDM64", FALSE, 0, MINUS_ONE, FALSE),
205 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */
206 HOWTO(R_390_TLS_IE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
207 bfd_elf_generic_reloc, "R_390_TLS_IE64", FALSE, 0, MINUS_ONE, FALSE),
208 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
209 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, MINUS_ONE, TRUE),
210 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */
211 HOWTO(R_390_TLS_LE64, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
212 bfd_elf_generic_reloc, "R_390_TLS_LE64", FALSE, 0, MINUS_ONE, FALSE),
213 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */
214 HOWTO(R_390_TLS_LDO64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
215 bfd_elf_generic_reloc, "R_390_TLS_LDO64", FALSE, 0, MINUS_ONE, FALSE),
216 HOWTO(R_390_TLS_DTPMOD, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
217 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, MINUS_ONE, FALSE),
218 HOWTO(R_390_TLS_DTPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
219 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, MINUS_ONE, FALSE),
220 HOWTO(R_390_TLS_TPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
221 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, MINUS_ONE, FALSE),
222 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
223 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE),
224 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
225 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE),
226 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
227 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE),
228 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
229 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE),
230};
231
232/* GNU extension to record C++ vtable hierarchy. */
233static reloc_howto_type elf64_s390_vtinherit_howto =
234 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
235static reloc_howto_type elf64_s390_vtentry_howto =
236 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);
237
238static reloc_howto_type *
239elf_s390_reloc_type_lookup (abfd, code)
240 bfd *abfd ATTRIBUTE_UNUSED;
241 bfd_reloc_code_real_type code;
242{
243 switch (code)
244 {
245 case BFD_RELOC_NONE:
246 return &elf_howto_table[(int) R_390_NONE];
247 case BFD_RELOC_8:
248 return &elf_howto_table[(int) R_390_8];
249 case BFD_RELOC_390_12:
250 return &elf_howto_table[(int) R_390_12];
251 case BFD_RELOC_16:
252 return &elf_howto_table[(int) R_390_16];
253 case BFD_RELOC_32:
254 return &elf_howto_table[(int) R_390_32];
255 case BFD_RELOC_CTOR:
256 return &elf_howto_table[(int) R_390_32];
257 case BFD_RELOC_32_PCREL:
258 return &elf_howto_table[(int) R_390_PC32];
259 case BFD_RELOC_390_GOT12:
260 return &elf_howto_table[(int) R_390_GOT12];
261 case BFD_RELOC_32_GOT_PCREL:
262 return &elf_howto_table[(int) R_390_GOT32];
263 case BFD_RELOC_390_PLT32:
264 return &elf_howto_table[(int) R_390_PLT32];
265 case BFD_RELOC_390_COPY:
266 return &elf_howto_table[(int) R_390_COPY];
267 case BFD_RELOC_390_GLOB_DAT:
268 return &elf_howto_table[(int) R_390_GLOB_DAT];
269 case BFD_RELOC_390_JMP_SLOT:
270 return &elf_howto_table[(int) R_390_JMP_SLOT];
271 case BFD_RELOC_390_RELATIVE:
272 return &elf_howto_table[(int) R_390_RELATIVE];
273 case BFD_RELOC_32_GOTOFF:
274 return &elf_howto_table[(int) R_390_GOTOFF32];
275 case BFD_RELOC_390_GOTPC:
276 return &elf_howto_table[(int) R_390_GOTPC];
277 case BFD_RELOC_390_GOT16:
278 return &elf_howto_table[(int) R_390_GOT16];
279 case BFD_RELOC_16_PCREL:
280 return &elf_howto_table[(int) R_390_PC16];
281 case BFD_RELOC_390_PC16DBL:
282 return &elf_howto_table[(int) R_390_PC16DBL];
283 case BFD_RELOC_390_PLT16DBL:
284 return &elf_howto_table[(int) R_390_PLT16DBL];
285 case BFD_RELOC_390_PC32DBL:
286 return &elf_howto_table[(int) R_390_PC32DBL];
287 case BFD_RELOC_390_PLT32DBL:
288 return &elf_howto_table[(int) R_390_PLT32DBL];
289 case BFD_RELOC_390_GOTPCDBL:
290 return &elf_howto_table[(int) R_390_GOTPCDBL];
291 case BFD_RELOC_64:
292 return &elf_howto_table[(int) R_390_64];
293 case BFD_RELOC_64_PCREL:
294 return &elf_howto_table[(int) R_390_PC64];
295 case BFD_RELOC_390_GOT64:
296 return &elf_howto_table[(int) R_390_GOT64];
297 case BFD_RELOC_390_PLT64:
298 return &elf_howto_table[(int) R_390_PLT64];
299 case BFD_RELOC_390_GOTENT:
300 return &elf_howto_table[(int) R_390_GOTENT];
301 case BFD_RELOC_16_GOTOFF:
302 return &elf_howto_table[(int) R_390_GOTOFF16];
303 case BFD_RELOC_390_GOTOFF64:
304 return &elf_howto_table[(int) R_390_GOTOFF64];
305 case BFD_RELOC_390_GOTPLT12:
306 return &elf_howto_table[(int) R_390_GOTPLT12];
307 case BFD_RELOC_390_GOTPLT16:
308 return &elf_howto_table[(int) R_390_GOTPLT16];
309 case BFD_RELOC_390_GOTPLT32:
310 return &elf_howto_table[(int) R_390_GOTPLT32];
311 case BFD_RELOC_390_GOTPLT64:
312 return &elf_howto_table[(int) R_390_GOTPLT64];
313 case BFD_RELOC_390_GOTPLTENT:
314 return &elf_howto_table[(int) R_390_GOTPLTENT];
315 case BFD_RELOC_390_PLTOFF16:
316 return &elf_howto_table[(int) R_390_PLTOFF16];
317 case BFD_RELOC_390_PLTOFF32:
318 return &elf_howto_table[(int) R_390_PLTOFF32];
319 case BFD_RELOC_390_PLTOFF64:
320 return &elf_howto_table[(int) R_390_PLTOFF64];
321 case BFD_RELOC_390_TLS_LOAD:
322 return &elf_howto_table[(int) R_390_TLS_LOAD];
323 case BFD_RELOC_390_TLS_GDCALL:
324 return &elf_howto_table[(int) R_390_TLS_GDCALL];
325 case BFD_RELOC_390_TLS_LDCALL:
326 return &elf_howto_table[(int) R_390_TLS_LDCALL];
327 case BFD_RELOC_390_TLS_GD64:
328 return &elf_howto_table[(int) R_390_TLS_GD64];
329 case BFD_RELOC_390_TLS_GOTIE12:
330 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
331 case BFD_RELOC_390_TLS_GOTIE64:
332 return &elf_howto_table[(int) R_390_TLS_GOTIE64];
333 case BFD_RELOC_390_TLS_LDM64:
334 return &elf_howto_table[(int) R_390_TLS_LDM64];
335 case BFD_RELOC_390_TLS_IE64:
336 return &elf_howto_table[(int) R_390_TLS_IE64];
337 case BFD_RELOC_390_TLS_IEENT:
338 return &elf_howto_table[(int) R_390_TLS_IEENT];
339 case BFD_RELOC_390_TLS_LE64:
340 return &elf_howto_table[(int) R_390_TLS_LE64];
341 case BFD_RELOC_390_TLS_LDO64:
342 return &elf_howto_table[(int) R_390_TLS_LDO64];
343 case BFD_RELOC_390_TLS_DTPMOD:
344 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
345 case BFD_RELOC_390_TLS_DTPOFF:
346 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
347 case BFD_RELOC_390_TLS_TPOFF:
348 return &elf_howto_table[(int) R_390_TLS_TPOFF];
349 case BFD_RELOC_390_20:
350 return &elf_howto_table[(int) R_390_20];
351 case BFD_RELOC_390_GOT20:
352 return &elf_howto_table[(int) R_390_GOT20];
353 case BFD_RELOC_390_GOTPLT20:
354 return &elf_howto_table[(int) R_390_GOTPLT20];
355 case BFD_RELOC_390_TLS_GOTIE20:
356 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
357 case BFD_RELOC_VTABLE_INHERIT:
358 return &elf64_s390_vtinherit_howto;
359 case BFD_RELOC_VTABLE_ENTRY:
360 return &elf64_s390_vtentry_howto;
361 default:
362 break;
363 }
364 return 0;
365}
366
367/* We need to use ELF64_R_TYPE so we have our own copy of this function,
368 and elf64-s390.c has its own copy. */
369
370static void
371elf_s390_info_to_howto (abfd, cache_ptr, dst)
372 bfd *abfd ATTRIBUTE_UNUSED;
373 arelent *cache_ptr;
374 Elf_Internal_Rela *dst;
375{
376 unsigned int r_type = ELF64_R_TYPE(dst->r_info);
377 switch (r_type)
378 {
379 case R_390_GNU_VTINHERIT:
380 cache_ptr->howto = &elf64_s390_vtinherit_howto;
381 break;
382
383 case R_390_GNU_VTENTRY:
384 cache_ptr->howto = &elf64_s390_vtentry_howto;
385 break;
386
387 default:
388 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
389 {
390 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
391 abfd, (int) r_type);
392 r_type = R_390_NONE;
393 }
394 cache_ptr->howto = &elf_howto_table[r_type];
395 }
396}
397
398/* A relocation function which doesn't do anything. */
399static bfd_reloc_status_type
400s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section,
401 output_bfd, error_message)
402 bfd *abfd ATTRIBUTE_UNUSED;
403 arelent *reloc_entry;
404 asymbol *symbol ATTRIBUTE_UNUSED;
405 PTR data ATTRIBUTE_UNUSED;
406 asection *input_section;
407 bfd *output_bfd;
408 char **error_message ATTRIBUTE_UNUSED;
409{
410 if (output_bfd)
411 reloc_entry->address += input_section->output_offset;
412 return bfd_reloc_ok;
413}
414
415/* Handle the large displacement relocs. */
416static bfd_reloc_status_type
417s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section,
418 output_bfd, error_message)
419 bfd *abfd;
420 arelent *reloc_entry;
421 asymbol *symbol;
422 PTR data;
423 asection *input_section;
424 bfd *output_bfd;
425 char **error_message ATTRIBUTE_UNUSED;
426{
427 reloc_howto_type *howto = reloc_entry->howto;
428 bfd_vma relocation;
429 bfd_vma insn;
430
431 if (output_bfd != (bfd *) NULL
432 && (symbol->flags & BSF_SECTION_SYM) == 0
433 && (! howto->partial_inplace
434 || reloc_entry->addend == 0))
435 {
436 reloc_entry->address += input_section->output_offset;
437 return bfd_reloc_ok;
438 }
439 if (output_bfd != NULL)
440 return bfd_reloc_continue;
441
442 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
443 return bfd_reloc_outofrange;
444
445 relocation = (symbol->value
446 + symbol->section->output_section->vma
447 + symbol->section->output_offset);
448 relocation += reloc_entry->addend;
449 if (howto->pc_relative)
450 {
451 relocation -= (input_section->output_section->vma
452 + input_section->output_offset);
453 relocation -= reloc_entry->address;
454 }
455
456 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
457 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
458 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
459
460 if ((bfd_signed_vma) relocation < - 0x80000
461 || (bfd_signed_vma) relocation > 0x7ffff)
462 return bfd_reloc_overflow;
463 else
464 return bfd_reloc_ok;
465}
466
467static bfd_boolean
468elf_s390_is_local_label_name (abfd, name)
469 bfd *abfd;
470 const char *name;
471{
472 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
473 return TRUE;
474
475 return _bfd_elf_is_local_label_name (abfd, name);
476}
477
478/* Functions for the 390 ELF linker. */
479
480/* The name of the dynamic interpreter. This is put in the .interp
481 section. */
482
483#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
484
485/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
486 copying dynamic variables from a shared lib into an app's dynbss
487 section, and instead use a dynamic relocation to point into the
488 shared lib. */
489#define ELIMINATE_COPY_RELOCS 1
490
491/* The size in bytes of the first entry in the procedure linkage table. */
492#define PLT_FIRST_ENTRY_SIZE 32
493/* The size in bytes of an entry in the procedure linkage table. */
494#define PLT_ENTRY_SIZE 32
495
496#define GOT_ENTRY_SIZE 8
497
498/* The first three entries in a procedure linkage table are reserved,
499 and the initial contents are unimportant (we zero them out).
500 Subsequent entries look like this. See the SVR4 ABI 386
501 supplement to see how this works. */
502
503/* For the s390, simple addr offset can only be 0 - 4096.
504 To use the full 16777216 TB address space, several instructions
505 are needed to load an address in a register and execute
506 a branch( or just saving the address)
507
508 Furthermore, only r 0 and 1 are free to use!!! */
509
510/* The first 3 words in the GOT are then reserved.
511 Word 0 is the address of the dynamic table.
512 Word 1 is a pointer to a structure describing the object
513 Word 2 is used to point to the loader entry address.
514
515 The code for PLT entries looks like this:
516
517 The GOT holds the address in the PLT to be executed.
518 The loader then gets:
519 24(15) = Pointer to the structure describing the object.
520 28(15) = Offset in symbol table
521 The loader must then find the module where the function is
522 and insert the address in the GOT.
523
524 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
525 LG 1,0(1) # 6 bytes Load address from GOT in r1
526 BCR 15,1 # 2 bytes Jump to address
527 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
528 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1
529 BRCL 15,-x # 6 bytes Jump to start of PLT
530 .long ? # 4 bytes offset into symbol table
531
532 Total = 32 bytes per PLT entry
533 Fixup at offset 2: relative address to GOT entry
534 Fixup at offset 22: relative branch to PLT0
535 Fixup at offset 28: 32 bit offset into symbol table
536
537 A 32 bit offset into the symbol table is enough. It allows for symbol
538 tables up to a size of 2 gigabyte. A single dynamic object (the main
539 program, any shared library) is limited to 4GB in size and I want to see
540 the program that manages to have a symbol table of more than 2 GB with a
541 total size of at max 4 GB. */
542
543#define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000
544#define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310
545#define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004
546#define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10
547#define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c
548#define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4
549#define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000
550#define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000
551
552/* The first PLT entry pushes the offset into the symbol table
553 from R1 onto the stack at 8(15) and the loader object info
554 at 12(15), loads the loader address in R1 and jumps to it. */
555
556/* The first entry in the PLT:
557
558 PLT0:
559 STG 1,56(15) # r1 contains the offset into the symbol table
560 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
561 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
562 LG 1,16(1) # get entry address of loader
563 BCR 15,1 # jump to loader
564
565 Fixup at offset 8: relative address to start of GOT. */
566
567#define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038
568#define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010
569#define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000
570#define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030
571#define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310
572#define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004
573#define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700
574#define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700
575
576/* The s390 linker needs to keep track of the number of relocs that it
577 decides to copy as dynamic relocs in check_relocs for each symbol.
578 This is so that it can later discard them if they are found to be
579 unnecessary. We store the information in a field extending the
580 regular ELF linker hash table. */
581
582struct elf_s390_dyn_relocs
583{
584 struct elf_s390_dyn_relocs *next;
585
586 /* The input section of the reloc. */
587 asection *sec;
588
589 /* Total number of relocs copied for the input section. */
590 bfd_size_type count;
591
592 /* Number of pc-relative relocs copied for the input section. */
593 bfd_size_type pc_count;
594};
595
596/* s390 ELF linker hash entry. */
597
598struct elf_s390_link_hash_entry
599{
600 struct elf_link_hash_entry elf;
601
602 /* Track dynamic relocs copied for this symbol. */
603 struct elf_s390_dyn_relocs *dyn_relocs;
604
605 /* Number of GOTPLT references for a function. */
606 bfd_signed_vma gotplt_refcount;
607
608#define GOT_UNKNOWN 0
609#define GOT_NORMAL 1
610#define GOT_TLS_GD 2
611#define GOT_TLS_IE 3
612#define GOT_TLS_IE_NLT 3
613 unsigned char tls_type;
614};
615
616#define elf_s390_hash_entry(ent) \
617 ((struct elf_s390_link_hash_entry *)(ent))
618
619struct elf_s390_obj_tdata
620{
621 struct elf_obj_tdata root;
622
623 /* tls_type for each local got entry. */
624 char *local_got_tls_type;
625};
626
627#define elf_s390_tdata(abfd) \
628 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
629
630#define elf_s390_local_got_tls_type(abfd) \
631 (elf_s390_tdata (abfd)->local_got_tls_type)
632
633static bfd_boolean
634elf_s390_mkobject (abfd)
635 bfd *abfd;
636{
637 bfd_size_type amt = sizeof (struct elf_s390_obj_tdata);
638 abfd->tdata.any = bfd_zalloc (abfd, amt);
639 if (abfd->tdata.any == NULL)
640 return FALSE;
641 return TRUE;
642}
643
644static bfd_boolean
645elf_s390_object_p (abfd)
646 bfd *abfd;
647{
648 /* Set the right machine number for an s390 elf32 file. */
649 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
650}
651
652/* s390 ELF linker hash table. */
653
654struct elf_s390_link_hash_table
655{
656 struct elf_link_hash_table elf;
657
658 /* Short-cuts to get to dynamic linker sections. */
659 asection *sgot;
660 asection *sgotplt;
661 asection *srelgot;
662 asection *splt;
663 asection *srelplt;
664 asection *sdynbss;
665 asection *srelbss;
666
667 union {
668 bfd_signed_vma refcount;
669 bfd_vma offset;
670 } tls_ldm_got;
671
672 /* Small local sym to section mapping cache. */
673 struct sym_sec_cache sym_sec;
674};
675
676/* Get the s390 ELF linker hash table from a link_info structure. */
677
678#define elf_s390_hash_table(p) \
679 ((struct elf_s390_link_hash_table *) ((p)->hash))
680
681/* Create an entry in an s390 ELF linker hash table. */
682
683static struct bfd_hash_entry *
684link_hash_newfunc (entry, table, string)
685 struct bfd_hash_entry *entry;
686 struct bfd_hash_table *table;
687 const char *string;
688{
689 /* Allocate the structure if it has not already been allocated by a
690 subclass. */
691 if (entry == NULL)
692 {
693 entry = bfd_hash_allocate (table,
694 sizeof (struct elf_s390_link_hash_entry));
695 if (entry == NULL)
696 return entry;
697 }
698
699 /* Call the allocation method of the superclass. */
700 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
701 if (entry != NULL)
702 {
703 struct elf_s390_link_hash_entry *eh;
704
705 eh = (struct elf_s390_link_hash_entry *) entry;
706 eh->dyn_relocs = NULL;
707 eh->gotplt_refcount = 0;
708 eh->tls_type = GOT_UNKNOWN;
709 }
710
711 return entry;
712}
713
714/* Create an s390 ELF linker hash table. */
715
716static struct bfd_link_hash_table *
717elf_s390_link_hash_table_create (abfd)
718 bfd *abfd;
719{
720 struct elf_s390_link_hash_table *ret;
721 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
722
723 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
724 if (ret == NULL)
725 return NULL;
726
727 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
728 {
729 free (ret);
730 return NULL;
731 }
732
733 ret->sgot = NULL;
734 ret->sgotplt = NULL;
735 ret->srelgot = NULL;
736 ret->splt = NULL;
737 ret->srelplt = NULL;
738 ret->sdynbss = NULL;
739 ret->srelbss = NULL;
740 ret->tls_ldm_got.refcount = 0;
741 ret->sym_sec.abfd = NULL;
742
743 return &ret->elf.root;
744}
745
746/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
747 shortcuts to them in our hash table. */
748
749static bfd_boolean
750create_got_section (dynobj, info)
751 bfd *dynobj;
752 struct bfd_link_info *info;
753{
754 struct elf_s390_link_hash_table *htab;
755
756 if (! _bfd_elf_create_got_section (dynobj, info))
757 return FALSE;
758
759 htab = elf_s390_hash_table (info);
760 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
761 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
762 if (!htab->sgot || !htab->sgotplt)
763 abort ();
764
765 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got",
766 (SEC_ALLOC | SEC_LOAD
767 | SEC_HAS_CONTENTS
768 | SEC_IN_MEMORY
769 | SEC_LINKER_CREATED
770 | SEC_READONLY));
771 if (htab->srelgot == NULL
772 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3))
773 return FALSE;
774 return TRUE;
775}
776
777/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
778 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
779 hash table. */
780
781static bfd_boolean
782elf_s390_create_dynamic_sections (dynobj, info)
783 bfd *dynobj;
784 struct bfd_link_info *info;
785{
786 struct elf_s390_link_hash_table *htab;
787
788 htab = elf_s390_hash_table (info);
789 if (!htab->sgot && !create_got_section (dynobj, info))
790 return FALSE;
791
792 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
793 return FALSE;
794
795 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
796 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
797 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
798 if (!info->shared)
799 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
800
801 if (!htab->splt || !htab->srelplt || !htab->sdynbss
802 || (!info->shared && !htab->srelbss))
803 abort ();
804
805 return TRUE;
806}
807
808/* Copy the extra info we tack onto an elf_link_hash_entry. */
809
810static void
811elf_s390_copy_indirect_symbol (info, dir, ind)
812 struct bfd_link_info *info;
813 struct elf_link_hash_entry *dir, *ind;
814{
815 struct elf_s390_link_hash_entry *edir, *eind;
816
817 edir = (struct elf_s390_link_hash_entry *) dir;
818 eind = (struct elf_s390_link_hash_entry *) ind;
819
820 if (eind->dyn_relocs != NULL)
821 {
822 if (edir->dyn_relocs != NULL)
823 {
824 struct elf_s390_dyn_relocs **pp;
825 struct elf_s390_dyn_relocs *p;
826
827 /* Add reloc counts against the indirect sym to the direct sym
828 list. Merge any entries against the same section. */
829 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
830 {
831 struct elf_s390_dyn_relocs *q;
832
833 for (q = edir->dyn_relocs; q != NULL; q = q->next)
834 if (q->sec == p->sec)
835 {
836 q->pc_count += p->pc_count;
837 q->count += p->count;
838 *pp = p->next;
839 break;
840 }
841 if (q == NULL)
842 pp = &p->next;
843 }
844 *pp = edir->dyn_relocs;
845 }
846
847 edir->dyn_relocs = eind->dyn_relocs;
848 eind->dyn_relocs = NULL;
849 }
850
851 if (ind->root.type == bfd_link_hash_indirect
852 && dir->got.refcount <= 0)
853 {
854 edir->tls_type = eind->tls_type;
855 eind->tls_type = GOT_UNKNOWN;
856 }
857
858 if (ELIMINATE_COPY_RELOCS
859 && ind->root.type != bfd_link_hash_indirect
860 && dir->dynamic_adjusted)
861 {
862 /* If called to transfer flags for a weakdef during processing
863 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
864 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
865 dir->ref_dynamic |= ind->ref_dynamic;
866 dir->ref_regular |= ind->ref_regular;
867 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
868 dir->needs_plt |= ind->needs_plt;
869 }
870 else
871 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
872}
873
874static int
875elf_s390_tls_transition (info, r_type, is_local)
876 struct bfd_link_info *info;
877 int r_type;
878 int is_local;
879{
880 if (info->shared)
881 return r_type;
882
883 switch (r_type)
884 {
885 case R_390_TLS_GD64:
886 case R_390_TLS_IE64:
887 if (is_local)
888 return R_390_TLS_LE64;
889 return R_390_TLS_IE64;
890 case R_390_TLS_GOTIE64:
891 if (is_local)
892 return R_390_TLS_LE64;
893 return R_390_TLS_GOTIE64;
894 case R_390_TLS_LDM64:
895 return R_390_TLS_LE64;
896 }
897
898 return r_type;
899}
900
901/* Look through the relocs for a section during the first phase, and
902 allocate space in the global offset table or procedure linkage
903 table. */
904
905static bfd_boolean
906elf_s390_check_relocs (abfd, info, sec, relocs)
907 bfd *abfd;
908 struct bfd_link_info *info;
909 asection *sec;
910 const Elf_Internal_Rela *relocs;
911{
912 struct elf_s390_link_hash_table *htab;
913 Elf_Internal_Shdr *symtab_hdr;
914 struct elf_link_hash_entry **sym_hashes;
915 const Elf_Internal_Rela *rel;
916 const Elf_Internal_Rela *rel_end;
917 asection *sreloc;
918 bfd_signed_vma *local_got_refcounts;
919 int tls_type, old_tls_type;
920
921 if (info->relocatable)
922 return TRUE;
923
924 htab = elf_s390_hash_table (info);
925 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
926 sym_hashes = elf_sym_hashes (abfd);
927 local_got_refcounts = elf_local_got_refcounts (abfd);
928
929 sreloc = NULL;
930
931 rel_end = relocs + sec->reloc_count;
932 for (rel = relocs; rel < rel_end; rel++)
933 {
934 unsigned int r_type;
935 unsigned long r_symndx;
936 struct elf_link_hash_entry *h;
937
938 r_symndx = ELF64_R_SYM (rel->r_info);
939
940 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
941 {
942 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
943 abfd,
944 r_symndx);
945 return FALSE;
946 }
947
948 if (r_symndx < symtab_hdr->sh_info)
949 h = NULL;
950 else
951 {
952 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
953 while (h->root.type == bfd_link_hash_indirect
954 || h->root.type == bfd_link_hash_warning)
955 h = (struct elf_link_hash_entry *) h->root.u.i.link;
956 }
957
958 /* Create got section and local_got_refcounts array if they
959 are needed. */
960 r_type = elf_s390_tls_transition (info,
961 ELF64_R_TYPE (rel->r_info),
962 h == NULL);
963 switch (r_type)
964 {
965 case R_390_GOT12:
966 case R_390_GOT16:
967 case R_390_GOT20:
968 case R_390_GOT32:
969 case R_390_GOT64:
970 case R_390_GOTENT:
971 case R_390_GOTPLT12:
972 case R_390_GOTPLT16:
973 case R_390_GOTPLT20:
974 case R_390_GOTPLT32:
975 case R_390_GOTPLT64:
976 case R_390_GOTPLTENT:
977 case R_390_TLS_GD64:
978 case R_390_TLS_GOTIE12:
979 case R_390_TLS_GOTIE20:
980 case R_390_TLS_GOTIE64:
981 case R_390_TLS_IEENT:
982 case R_390_TLS_IE64:
983 case R_390_TLS_LDM64:
984 if (h == NULL
985 && local_got_refcounts == NULL)
986 {
987 bfd_size_type size;
988
989 size = symtab_hdr->sh_info;
990 size *= (sizeof (bfd_signed_vma) + sizeof(char));
991 local_got_refcounts = ((bfd_signed_vma *)
992 bfd_zalloc (abfd, size));
993 if (local_got_refcounts == NULL)
994 return FALSE;
995 elf_local_got_refcounts (abfd) = local_got_refcounts;
996 elf_s390_local_got_tls_type (abfd)
997 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
998 }
999 /* Fall through. */
1000 case R_390_GOTOFF16:
1001 case R_390_GOTOFF32:
1002 case R_390_GOTOFF64:
1003 case R_390_GOTPC:
1004 case R_390_GOTPCDBL:
1005 if (htab->sgot == NULL)
1006 {
1007 if (htab->elf.dynobj == NULL)
1008 htab->elf.dynobj = abfd;
1009 if (!create_got_section (htab->elf.dynobj, info))
1010 return FALSE;
1011 }
1012 }
1013
1014 switch (r_type)
1015 {
1016 case R_390_GOTOFF16:
1017 case R_390_GOTOFF32:
1018 case R_390_GOTOFF64:
1019 case R_390_GOTPC:
1020 case R_390_GOTPCDBL:
1021 /* Got is created, nothing to be done. */
1022 break;
1023
1024 case R_390_PLT16DBL:
1025 case R_390_PLT32:
1026 case R_390_PLT32DBL:
1027 case R_390_PLT64:
1028 case R_390_PLTOFF16:
1029 case R_390_PLTOFF32:
1030 case R_390_PLTOFF64:
1031 /* This symbol requires a procedure linkage table entry. We
1032 actually build the entry in adjust_dynamic_symbol,
1033 because this might be a case of linking PIC code which is
1034 never referenced by a dynamic object, in which case we
1035 don't need to generate a procedure linkage table entry
1036 after all. */
1037
1038 /* If this is a local symbol, we resolve it directly without
1039 creating a procedure linkage table entry. */
1040 if (h != NULL)
1041 {
1042 h->needs_plt = 1;
1043 h->plt.refcount += 1;
1044 }
1045 break;
1046
1047 case R_390_GOTPLT12:
1048 case R_390_GOTPLT16:
1049 case R_390_GOTPLT20:
1050 case R_390_GOTPLT32:
1051 case R_390_GOTPLT64:
1052 case R_390_GOTPLTENT:
1053 /* This symbol requires either a procedure linkage table entry
1054 or an entry in the local got. We actually build the entry
1055 in adjust_dynamic_symbol because whether this is really a
1056 global reference can change and with it the fact if we have
1057 to create a plt entry or a local got entry. To be able to
1058 make a once global symbol a local one we have to keep track
1059 of the number of gotplt references that exist for this
1060 symbol. */
1061 if (h != NULL)
1062 {
1063 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1064 h->needs_plt = 1;
1065 h->plt.refcount += 1;
1066 }
1067 else
1068 local_got_refcounts[r_symndx] += 1;
1069 break;
1070
1071 case R_390_TLS_LDM64:
1072 htab->tls_ldm_got.refcount += 1;
1073 break;
1074
1075 case R_390_TLS_IE64:
1076 case R_390_TLS_GOTIE12:
1077 case R_390_TLS_GOTIE20:
1078 case R_390_TLS_GOTIE64:
1079 case R_390_TLS_IEENT:
1080 if (info->shared)
1081 info->flags |= DF_STATIC_TLS;
1082 /* Fall through */
1083
1084 case R_390_GOT12:
1085 case R_390_GOT16:
1086 case R_390_GOT20:
1087 case R_390_GOT32:
1088 case R_390_GOT64:
1089 case R_390_GOTENT:
1090 case R_390_TLS_GD64:
1091 /* This symbol requires a global offset table entry. */
1092 switch (r_type)
1093 {
1094 default:
1095 case R_390_GOT12:
1096 case R_390_GOT16:
1097 case R_390_GOT20:
1098 case R_390_GOT32:
1099 case R_390_GOTENT:
1100 tls_type = GOT_NORMAL;
1101 break;
1102 case R_390_TLS_GD64:
1103 tls_type = GOT_TLS_GD;
1104 break;
1105 case R_390_TLS_IE64:
1106 case R_390_TLS_GOTIE64:
1107 tls_type = GOT_TLS_IE;
1108 break;
1109 case R_390_TLS_GOTIE12:
1110 case R_390_TLS_GOTIE20:
1111 case R_390_TLS_IEENT:
1112 tls_type = GOT_TLS_IE_NLT;
1113 break;
1114 }
1115
1116 if (h != NULL)
1117 {
1118 h->got.refcount += 1;
1119 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1120 }
1121 else
1122 {
1123 local_got_refcounts[r_symndx] += 1;
1124 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1125 }
1126 /* If a TLS symbol is accessed using IE at least once,
1127 there is no point to use dynamic model for it. */
1128 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1129 {
1130 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1131 {
1132 (*_bfd_error_handler)
1133 (_("%B: `%s' accessed both as normal and thread local symbol"),
1134 abfd, h->root.root.string);
1135 return FALSE;
1136 }
1137 if (old_tls_type > tls_type)
1138 tls_type = old_tls_type;
1139 }
1140
1141 if (old_tls_type != tls_type)
1142 {
1143 if (h != NULL)
1144 elf_s390_hash_entry (h)->tls_type = tls_type;
1145 else
1146 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1147 }
1148
1149 if (r_type != R_390_TLS_IE64)
1150 break;
1151 /* Fall through */
1152
1153 case R_390_TLS_LE64:
1154 if (!info->shared)
1155 break;
1156 info->flags |= DF_STATIC_TLS;
1157 /* Fall through */
1158
1159 case R_390_8:
1160 case R_390_16:
1161 case R_390_32:
1162 case R_390_64:
1163 case R_390_PC16:
1164 case R_390_PC16DBL:
1165 case R_390_PC32:
1166 case R_390_PC32DBL:
1167 case R_390_PC64:
1168 if (h != NULL && !info->shared)
1169 {
1170 /* If this reloc is in a read-only section, we might
1171 need a copy reloc. We can't check reliably at this
1172 stage whether the section is read-only, as input
1173 sections have not yet been mapped to output sections.
1174 Tentatively set the flag for now, and correct in
1175 adjust_dynamic_symbol. */
1176 h->non_got_ref = 1;
1177
1178 /* We may need a .plt entry if the function this reloc
1179 refers to is in a shared lib. */
1180 h->plt.refcount += 1;
1181 }
1182
1183 /* If we are creating a shared library, and this is a reloc
1184 against a global symbol, or a non PC relative reloc
1185 against a local symbol, then we need to copy the reloc
1186 into the shared library. However, if we are linking with
1187 -Bsymbolic, we do not need to copy a reloc against a
1188 global symbol which is defined in an object we are
1189 including in the link (i.e., DEF_REGULAR is set). At
1190 this point we have not seen all the input files, so it is
1191 possible that DEF_REGULAR is not set now but will be set
1192 later (it is never cleared). In case of a weak definition,
1193 DEF_REGULAR may be cleared later by a strong definition in
1194 a shared library. We account for that possibility below by
1195 storing information in the relocs_copied field of the hash
1196 table entry. A similar situation occurs when creating
1197 shared libraries and symbol visibility changes render the
1198 symbol local.
1199
1200 If on the other hand, we are creating an executable, we
1201 may need to keep relocations for symbols satisfied by a
1202 dynamic library if we manage to avoid copy relocs for the
1203 symbol. */
1204 if ((info->shared
1205 && (sec->flags & SEC_ALLOC) != 0
1206 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
1207 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
1208 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
1209 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
1210 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
1211 || (h != NULL
1212 && (! info->symbolic
1213 || h->root.type == bfd_link_hash_defweak
1214 || !h->def_regular))))
1215 || (ELIMINATE_COPY_RELOCS
1216 && !info->shared
1217 && (sec->flags & SEC_ALLOC) != 0
1218 && h != NULL
1219 && (h->root.type == bfd_link_hash_defweak
1220 || !h->def_regular)))
1221 {
1222 struct elf_s390_dyn_relocs *p;
1223 struct elf_s390_dyn_relocs **head;
1224
1225 /* We must copy these reloc types into the output file.
1226 Create a reloc section in dynobj and make room for
1227 this reloc. */
1228 if (sreloc == NULL)
1229 {
1230 const char *name;
1231 bfd *dynobj;
1232
1233 name = (bfd_elf_string_from_elf_section
1234 (abfd,
1235 elf_elfheader (abfd)->e_shstrndx,
1236 elf_section_data (sec)->rel_hdr.sh_name));
1237 if (name == NULL)
1238 return FALSE;
1239
1240 if (strncmp (name, ".rela", 5) != 0
1241 || strcmp (bfd_get_section_name (abfd, sec),
1242 name + 5) != 0)
1243 {
1244 (*_bfd_error_handler)
1245 (_("%B: bad relocation section name `%s\'"),
1246 abfd, name);
1247 }
1248
1249 if (htab->elf.dynobj == NULL)
1250 htab->elf.dynobj = abfd;
1251
1252 dynobj = htab->elf.dynobj;
1253 sreloc = bfd_get_section_by_name (dynobj, name);
1254 if (sreloc == NULL)
1255 {
1256 flagword flags;
1257
1258 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1259 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1260 if ((sec->flags & SEC_ALLOC) != 0)
1261 flags |= SEC_ALLOC | SEC_LOAD;
1262 sreloc = bfd_make_section_with_flags (dynobj,
1263 name,
1264 flags);
1265 if (sreloc == NULL
1266 || ! bfd_set_section_alignment (dynobj, sreloc, 3))
1267 return FALSE;
1268 }
1269 elf_section_data (sec)->sreloc = sreloc;
1270 }
1271
1272 /* If this is a global symbol, we count the number of
1273 relocations we need for this symbol. */
1274 if (h != NULL)
1275 {
1276 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1277 }
1278 else
1279 {
1280 /* Track dynamic relocs needed for local syms too.
1281 We really need local syms available to do this
1282 easily. Oh well. */
1283
1284 asection *s;
1285 void *vpp;
1286
1287 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1288 sec, r_symndx);
1289 if (s == NULL)
1290 return FALSE;
1291
1292 vpp = &elf_section_data (s)->local_dynrel;
1293 head = (struct elf_s390_dyn_relocs **) vpp;
1294 }
1295
1296 p = *head;
1297 if (p == NULL || p->sec != sec)
1298 {
1299 bfd_size_type amt = sizeof *p;
1300 p = ((struct elf_s390_dyn_relocs *)
1301 bfd_alloc (htab->elf.dynobj, amt));
1302 if (p == NULL)
1303 return FALSE;
1304 p->next = *head;
1305 *head = p;
1306 p->sec = sec;
1307 p->count = 0;
1308 p->pc_count = 0;
1309 }
1310
1311 p->count += 1;
1312 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
1313 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1314 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
1315 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
1316 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
1317 p->pc_count += 1;
1318 }
1319 break;
1320
1321 /* This relocation describes the C++ object vtable hierarchy.
1322 Reconstruct it for later use during GC. */
1323 case R_390_GNU_VTINHERIT:
1324 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1325 return FALSE;
1326 break;
1327
1328 /* This relocation describes which C++ vtable entries are actually
1329 used. Record for later use during GC. */
1330 case R_390_GNU_VTENTRY:
1331 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1332 return FALSE;
1333 break;
1334
1335 default:
1336 break;
1337 }
1338 }
1339
1340 return TRUE;
1341}
1342
1343/* Return the section that should be marked against GC for a given
1344 relocation. */
1345
1346static asection *
1347elf_s390_gc_mark_hook (sec, info, rel, h, sym)
1348 asection *sec;
1349 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1350 Elf_Internal_Rela *rel;
1351 struct elf_link_hash_entry *h;
1352 Elf_Internal_Sym *sym;
1353{
1354 if (h != NULL)
1355 {
1356 switch (ELF64_R_TYPE (rel->r_info))
1357 {
1358 case R_390_GNU_VTINHERIT:
1359 case R_390_GNU_VTENTRY:
1360 break;
1361
1362 default:
1363 switch (h->root.type)
1364 {
1365 case bfd_link_hash_defined:
1366 case bfd_link_hash_defweak:
1367 return h->root.u.def.section;
1368
1369 case bfd_link_hash_common:
1370 return h->root.u.c.p->section;
1371
1372 default:
1373 break;
1374 }
1375 }
1376 }
1377 else
1378 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1379
1380 return NULL;
1381}
1382
1383/* Update the got entry reference counts for the section being removed. */
1384
1385static bfd_boolean
1386elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
1387 bfd *abfd;
1388 struct bfd_link_info *info;
1389 asection *sec;
1390 const Elf_Internal_Rela *relocs;
1391{
1392 Elf_Internal_Shdr *symtab_hdr;
1393 struct elf_link_hash_entry **sym_hashes;
1394 bfd_signed_vma *local_got_refcounts;
1395 const Elf_Internal_Rela *rel, *relend;
1396
1397 elf_section_data (sec)->local_dynrel = NULL;
1398
1399 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1400 sym_hashes = elf_sym_hashes (abfd);
1401 local_got_refcounts = elf_local_got_refcounts (abfd);
1402
1403 relend = relocs + sec->reloc_count;
1404 for (rel = relocs; rel < relend; rel++)
1405 {
1406 unsigned long r_symndx;
1407 unsigned int r_type;
1408 struct elf_link_hash_entry *h = NULL;
1409
1410 r_symndx = ELF64_R_SYM (rel->r_info);
1411 if (r_symndx >= symtab_hdr->sh_info)
1412 {
1413 struct elf_s390_link_hash_entry *eh;
1414 struct elf_s390_dyn_relocs **pp;
1415 struct elf_s390_dyn_relocs *p;
1416
1417 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1418 while (h->root.type == bfd_link_hash_indirect
1419 || h->root.type == bfd_link_hash_warning)
1420 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1421 eh = (struct elf_s390_link_hash_entry *) h;
1422
1423 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1424 if (p->sec == sec)
1425 {
1426 /* Everything must go for SEC. */
1427 *pp = p->next;
1428 break;
1429 }
1430 }
1431
1432 r_type = ELF64_R_TYPE (rel->r_info);
1433 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1434 switch (r_type)
1435 {
1436 case R_390_TLS_LDM64:
1437 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1438 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1439 break;
1440
1441 case R_390_TLS_GD64:
1442 case R_390_TLS_IE64:
1443 case R_390_TLS_GOTIE12:
1444 case R_390_TLS_GOTIE20:
1445 case R_390_TLS_GOTIE64:
1446 case R_390_TLS_IEENT:
1447 case R_390_GOT12:
1448 case R_390_GOT16:
1449 case R_390_GOT20:
1450 case R_390_GOT32:
1451 case R_390_GOT64:
1452 case R_390_GOTOFF16:
1453 case R_390_GOTOFF32:
1454 case R_390_GOTOFF64:
1455 case R_390_GOTPC:
1456 case R_390_GOTPCDBL:
1457 case R_390_GOTENT:
1458 if (h != NULL)
1459 {
1460 if (h->got.refcount > 0)
1461 h->got.refcount -= 1;
1462 }
1463 else if (local_got_refcounts != NULL)
1464 {
1465 if (local_got_refcounts[r_symndx] > 0)
1466 local_got_refcounts[r_symndx] -= 1;
1467 }
1468 break;
1469
1470 case R_390_8:
1471 case R_390_12:
1472 case R_390_16:
1473 case R_390_20:
1474 case R_390_32:
1475 case R_390_64:
1476 case R_390_PC16:
1477 case R_390_PC16DBL:
1478 case R_390_PC32:
1479 case R_390_PC32DBL:
1480 case R_390_PC64:
1481 if (info->shared)
1482 break;
1483 /* Fall through */
1484
1485 case R_390_PLT16DBL:
1486 case R_390_PLT32:
1487 case R_390_PLT32DBL:
1488 case R_390_PLT64:
1489 case R_390_PLTOFF16:
1490 case R_390_PLTOFF32:
1491 case R_390_PLTOFF64:
1492 if (h != NULL)
1493 {
1494 if (h->plt.refcount > 0)
1495 h->plt.refcount -= 1;
1496 }
1497 break;
1498
1499 case R_390_GOTPLT12:
1500 case R_390_GOTPLT16:
1501 case R_390_GOTPLT20:
1502 case R_390_GOTPLT32:
1503 case R_390_GOTPLT64:
1504 case R_390_GOTPLTENT:
1505 if (h != NULL)
1506 {
1507 if (h->plt.refcount > 0)
1508 {
1509 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1510 h->plt.refcount -= 1;
1511 }
1512 }
1513 else if (local_got_refcounts != NULL)
1514 {
1515 if (local_got_refcounts[r_symndx] > 0)
1516 local_got_refcounts[r_symndx] -= 1;
1517 }
1518 break;
1519
1520 default:
1521 break;
1522 }
1523 }
1524
1525 return TRUE;
1526}
1527
1528/* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1529 entry but we found we will not create any. Called when we find we will
1530 not have any PLT for this symbol, by for example
1531 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1532 or elf_s390_size_dynamic_sections if no dynamic sections will be
1533 created (we're only linking static objects). */
1534
1535static void
1536elf_s390_adjust_gotplt (h)
1537 struct elf_s390_link_hash_entry *h;
1538{
1539 if (h->elf.root.type == bfd_link_hash_warning)
1540 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1541
1542 if (h->gotplt_refcount <= 0)
1543 return;
1544
1545 /* We simply add the number of gotplt references to the number
1546 * of got references for this symbol. */
1547 h->elf.got.refcount += h->gotplt_refcount;
1548 h->gotplt_refcount = -1;
1549}
1550
1551/* Adjust a symbol defined by a dynamic object and referenced by a
1552 regular object. The current definition is in some section of the
1553 dynamic object, but we're not including those sections. We have to
1554 change the definition to something the rest of the link can
1555 understand. */
1556
1557static bfd_boolean
1558elf_s390_adjust_dynamic_symbol (info, h)
1559 struct bfd_link_info *info;
1560 struct elf_link_hash_entry *h;
1561{
1562 struct elf_s390_link_hash_table *htab;
1563 asection *s;
1564 unsigned int power_of_two;
1565
1566 /* If this is a function, put it in the procedure linkage table. We
1567 will fill in the contents of the procedure linkage table later
1568 (although we could actually do it here). */
1569 if (h->type == STT_FUNC
1570 || h->needs_plt)
1571 {
1572 if (h->plt.refcount <= 0
1573 || (! info->shared
1574 && !h->def_dynamic
1575 && !h->ref_dynamic
1576 && h->root.type != bfd_link_hash_undefweak
1577 && h->root.type != bfd_link_hash_undefined))
1578 {
1579 /* This case can occur if we saw a PLT32 reloc in an input
1580 file, but the symbol was never referred to by a dynamic
1581 object, or if all references were garbage collected. In
1582 such a case, we don't actually need to build a procedure
1583 linkage table, and we can just do a PC32 reloc instead. */
1584 h->plt.offset = (bfd_vma) -1;
1585 h->needs_plt = 0;
1586 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1587 }
1588
1589 return TRUE;
1590 }
1591 else
1592 /* It's possible that we incorrectly decided a .plt reloc was
1593 needed for an R_390_PC32 reloc to a non-function sym in
1594 check_relocs. We can't decide accurately between function and
1595 non-function syms in check-relocs; Objects loaded later in
1596 the link may change h->type. So fix it now. */
1597 h->plt.offset = (bfd_vma) -1;
1598
1599 /* If this is a weak symbol, and there is a real definition, the
1600 processor independent code will have arranged for us to see the
1601 real definition first, and we can just use the same value. */
1602 if (h->u.weakdef != NULL)
1603 {
1604 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1605 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1606 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1607 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1608 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1609 h->non_got_ref = h->u.weakdef->non_got_ref;
1610 return TRUE;
1611 }
1612
1613 /* This is a reference to a symbol defined by a dynamic object which
1614 is not a function. */
1615
1616 /* If we are creating a shared library, we must presume that the
1617 only references to the symbol are via the global offset table.
1618 For such cases we need not do anything here; the relocations will
1619 be handled correctly by relocate_section. */
1620 if (info->shared)
1621 return TRUE;
1622
1623 /* If there are no references to this symbol that do not use the
1624 GOT, we don't need to generate a copy reloc. */
1625 if (!h->non_got_ref)
1626 return TRUE;
1627
1628 /* If -z nocopyreloc was given, we won't generate them either. */
1629 if (info->nocopyreloc)
1630 {
1631 h->non_got_ref = 0;
1632 return TRUE;
1633 }
1634
1635 if (ELIMINATE_COPY_RELOCS)
1636 {
1637 struct elf_s390_link_hash_entry * eh;
1638 struct elf_s390_dyn_relocs *p;
1639
1640 eh = (struct elf_s390_link_hash_entry *) h;
1641 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1642 {
1643 s = p->sec->output_section;
1644 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1645 break;
1646 }
1647
1648 /* If we didn't find any dynamic relocs in read-only sections, then
1649 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1650 if (p == NULL)
1651 {
1652 h->non_got_ref = 0;
1653 return TRUE;
1654 }
1655 }
1656
1657 if (h->size == 0)
1658 {
1659 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1660 h->root.root.string);
1661 return TRUE;
1662 }
1663
1664 /* We must allocate the symbol in our .dynbss section, which will
1665 become part of the .bss section of the executable. There will be
1666 an entry for this symbol in the .dynsym section. The dynamic
1667 object will contain position independent code, so all references
1668 from the dynamic object to this symbol will go through the global
1669 offset table. The dynamic linker will use the .dynsym entry to
1670 determine the address it must put in the global offset table, so
1671 both the dynamic object and the regular object will refer to the
1672 same memory location for the variable. */
1673
1674 htab = elf_s390_hash_table (info);
1675
1676 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1677 copy the initial value out of the dynamic object and into the
1678 runtime process image. */
1679 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1680 {
1681 htab->srelbss->size += sizeof (Elf64_External_Rela);
1682 h->needs_copy = 1;
1683 }
1684
1685 /* We need to figure out the alignment required for this symbol. I
1686 have no idea how ELF linkers handle this. */
1687 power_of_two = bfd_log2 (h->size);
1688 if (power_of_two > 3)
1689 power_of_two = 3;
1690
1691 /* Apply the required alignment. */
1692 s = htab->sdynbss;
1693 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1694 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1695 {
1696 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1697 return FALSE;
1698 }
1699
1700 /* Define the symbol as being at this point in the section. */
1701 h->root.u.def.section = s;
1702 h->root.u.def.value = s->size;
1703
1704 /* Increment the section size to make room for the symbol. */
1705 s->size += h->size;
1706
1707 return TRUE;
1708}
1709
1710/* Allocate space in .plt, .got and associated reloc sections for
1711 dynamic relocs. */
1712
1713static bfd_boolean
1714allocate_dynrelocs (h, inf)
1715 struct elf_link_hash_entry *h;
1716 PTR inf;
1717{
1718 struct bfd_link_info *info;
1719 struct elf_s390_link_hash_table *htab;
1720 struct elf_s390_link_hash_entry *eh;
1721 struct elf_s390_dyn_relocs *p;
1722
1723 if (h->root.type == bfd_link_hash_indirect)
1724 return TRUE;
1725
1726 if (h->root.type == bfd_link_hash_warning)
1727 /* When warning symbols are created, they **replace** the "real"
1728 entry in the hash table, thus we never get to see the real
1729 symbol in a hash traversal. So look at it now. */
1730 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1731
1732 info = (struct bfd_link_info *) inf;
1733 htab = elf_s390_hash_table (info);
1734
1735 if (htab->elf.dynamic_sections_created
1736 && h->plt.refcount > 0
1737 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1738 || h->root.type != bfd_link_hash_undefweak))
1739 {
1740 /* Make sure this symbol is output as a dynamic symbol.
1741 Undefined weak syms won't yet be marked as dynamic. */
1742 if (h->dynindx == -1
1743 && !h->forced_local)
1744 {
1745 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1746 return FALSE;
1747 }
1748
1749 if (info->shared
1750 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1751 {
1752 asection *s = htab->splt;
1753
1754 /* If this is the first .plt entry, make room for the special
1755 first entry. */
1756 if (s->size == 0)
1757 s->size += PLT_FIRST_ENTRY_SIZE;
1758
1759 h->plt.offset = s->size;
1760
1761 /* If this symbol is not defined in a regular file, and we are
1762 not generating a shared library, then set the symbol to this
1763 location in the .plt. This is required to make function
1764 pointers compare as equal between the normal executable and
1765 the shared library. */
1766 if (! info->shared
1767 && !h->def_regular)
1768 {
1769 h->root.u.def.section = s;
1770 h->root.u.def.value = h->plt.offset;
1771 }
1772
1773 /* Make room for this entry. */
1774 s->size += PLT_ENTRY_SIZE;
1775
1776 /* We also need to make an entry in the .got.plt section, which
1777 will be placed in the .got section by the linker script. */
1778 htab->sgotplt->size += GOT_ENTRY_SIZE;
1779
1780 /* We also need to make an entry in the .rela.plt section. */
1781 htab->srelplt->size += sizeof (Elf64_External_Rela);
1782 }
1783 else
1784 {
1785 h->plt.offset = (bfd_vma) -1;
1786 h->needs_plt = 0;
1787 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1788 }
1789 }
1790 else
1791 {
1792 h->plt.offset = (bfd_vma) -1;
1793 h->needs_plt = 0;
1794 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1795 }
1796
1797 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to
1798 the binary, we can optimize a bit. IE64 and GOTIE64 get converted
1799 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT
1800 we can save the dynamic TLS relocation. */
1801 if (h->got.refcount > 0
1802 && !info->shared
1803 && h->dynindx == -1
1804 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1805 {
1806 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1807 /* For the GOTIE access without a literal pool entry the offset has
1808 to be stored somewhere. The immediate value in the instruction
1809 is not bit enough so the value is stored in the got. */
1810 {
1811 h->got.offset = htab->sgot->size;
1812 htab->sgot->size += GOT_ENTRY_SIZE;
1813 }
1814 else
1815 h->got.offset = (bfd_vma) -1;
1816 }
1817 else if (h->got.refcount > 0)
1818 {
1819 asection *s;
1820 bfd_boolean dyn;
1821 int tls_type = elf_s390_hash_entry(h)->tls_type;
1822
1823 /* Make sure this symbol is output as a dynamic symbol.
1824 Undefined weak syms won't yet be marked as dynamic. */
1825 if (h->dynindx == -1
1826 && !h->forced_local)
1827 {
1828 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1829 return FALSE;
1830 }
1831
1832 s = htab->sgot;
1833 h->got.offset = s->size;
1834 s->size += GOT_ENTRY_SIZE;
1835 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */
1836 if (tls_type == GOT_TLS_GD)
1837 s->size += GOT_ENTRY_SIZE;
1838 dyn = htab->elf.dynamic_sections_created;
1839 /* R_390_TLS_IE64 needs one dynamic relocation,
1840 R_390_TLS_GD64 needs one if local symbol and two if global. */
1841 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1842 || tls_type >= GOT_TLS_IE)
1843 htab->srelgot->size += sizeof (Elf64_External_Rela);
1844 else if (tls_type == GOT_TLS_GD)
1845 htab->srelgot->size += 2 * sizeof (Elf64_External_Rela);
1846 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1847 || h->root.type != bfd_link_hash_undefweak)
1848 && (info->shared
1849 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1850 htab->srelgot->size += sizeof (Elf64_External_Rela);
1851 }
1852 else
1853 h->got.offset = (bfd_vma) -1;
1854
1855 eh = (struct elf_s390_link_hash_entry *) h;
1856 if (eh->dyn_relocs == NULL)
1857 return TRUE;
1858
1859 /* In the shared -Bsymbolic case, discard space allocated for
1860 dynamic pc-relative relocs against symbols which turn out to be
1861 defined in regular objects. For the normal shared case, discard
1862 space for pc-relative relocs that have become local due to symbol
1863 visibility changes. */
1864
1865 if (info->shared)
1866 {
1867 if (SYMBOL_REFERENCES_LOCAL (info, h))
1868 {
1869 struct elf_s390_dyn_relocs **pp;
1870
1871 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1872 {
1873 p->count -= p->pc_count;
1874 p->pc_count = 0;
1875 if (p->count == 0)
1876 *pp = p->next;
1877 else
1878 pp = &p->next;
1879 }
1880 }
1881
1882 /* Also discard relocs on undefined weak syms with non-default
1883 visibility. */
1884 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1885 && h->root.type == bfd_link_hash_undefweak)
1886 eh->dyn_relocs = NULL;
1887 }
1888 else if (ELIMINATE_COPY_RELOCS)
1889 {
1890 /* For the non-shared case, discard space for relocs against
1891 symbols which turn out to need copy relocs or are not
1892 dynamic. */
1893
1894 if (!h->non_got_ref
1895 && ((h->def_dynamic
1896 && !h->def_regular)
1897 || (htab->elf.dynamic_sections_created
1898 && (h->root.type == bfd_link_hash_undefweak
1899 || h->root.type == bfd_link_hash_undefined))))
1900 {
1901 /* Make sure this symbol is output as a dynamic symbol.
1902 Undefined weak syms won't yet be marked as dynamic. */
1903 if (h->dynindx == -1
1904 && !h->forced_local)
1905 {
1906 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1907 return FALSE;
1908 }
1909
1910 /* If that succeeded, we know we'll be keeping all the
1911 relocs. */
1912 if (h->dynindx != -1)
1913 goto keep;
1914 }
1915
1916 eh->dyn_relocs = NULL;
1917
1918 keep: ;
1919 }
1920
1921 /* Finally, allocate space. */
1922 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1923 {
1924 asection *sreloc = elf_section_data (p->sec)->sreloc;
1925 sreloc->size += p->count * sizeof (Elf64_External_Rela);
1926 }
1927
1928 return TRUE;
1929}
1930
1931/* Find any dynamic relocs that apply to read-only sections. */
1932
1933static bfd_boolean
1934readonly_dynrelocs (h, inf)
1935 struct elf_link_hash_entry *h;
1936 PTR inf;
1937{
1938 struct elf_s390_link_hash_entry *eh;
1939 struct elf_s390_dyn_relocs *p;
1940
1941 if (h->root.type == bfd_link_hash_warning)
1942 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1943
1944 eh = (struct elf_s390_link_hash_entry *) h;
1945 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1946 {
1947 asection *s = p->sec->output_section;
1948
1949 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1950 {
1951 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1952
1953 info->flags |= DF_TEXTREL;
1954
1955 /* Not an error, just cut short the traversal. */
1956 return FALSE;
1957 }
1958 }
1959 return TRUE;
1960}
1961
1962/* Set the sizes of the dynamic sections. */
1963
1964static bfd_boolean
1965elf_s390_size_dynamic_sections (output_bfd, info)
1966 bfd *output_bfd ATTRIBUTE_UNUSED;
1967 struct bfd_link_info *info;
1968{
1969 struct elf_s390_link_hash_table *htab;
1970 bfd *dynobj;
1971 asection *s;
1972 bfd_boolean relocs;
1973 bfd *ibfd;
1974
1975 htab = elf_s390_hash_table (info);
1976 dynobj = htab->elf.dynobj;
1977 if (dynobj == NULL)
1978 abort ();
1979
1980 if (htab->elf.dynamic_sections_created)
1981 {
1982 /* Set the contents of the .interp section to the interpreter. */
1983 if (info->executable)
1984 {
1985 s = bfd_get_section_by_name (dynobj, ".interp");
1986 if (s == NULL)
1987 abort ();
1988 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1989 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1990 }
1991 }
1992
1993 /* Set up .got offsets for local syms, and space for local dynamic
1994 relocs. */
1995 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1996 {
1997 bfd_signed_vma *local_got;
1998 bfd_signed_vma *end_local_got;
1999 char *local_tls_type;
2000 bfd_size_type locsymcount;
2001 Elf_Internal_Shdr *symtab_hdr;
2002 asection *srela;
2003
2004 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
2005 continue;
2006
2007 for (s = ibfd->sections; s != NULL; s = s->next)
2008 {
2009 struct elf_s390_dyn_relocs *p;
2010
2011 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
2012 {
2013 if (!bfd_is_abs_section (p->sec)
2014 && bfd_is_abs_section (p->sec->output_section))
2015 {
2016 /* Input section has been discarded, either because
2017 it is a copy of a linkonce section or due to
2018 linker script /DISCARD/, so we'll be discarding
2019 the relocs too. */
2020 }
2021 else if (p->count != 0)
2022 {
2023 srela = elf_section_data (p->sec)->sreloc;
2024 srela->size += p->count * sizeof (Elf64_External_Rela);
2025 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2026 info->flags |= DF_TEXTREL;
2027 }
2028 }
2029 }
2030
2031 local_got = elf_local_got_refcounts (ibfd);
2032 if (!local_got)
2033 continue;
2034
2035 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2036 locsymcount = symtab_hdr->sh_info;
2037 end_local_got = local_got + locsymcount;
2038 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2039 s = htab->sgot;
2040 srela = htab->srelgot;
2041 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2042 {
2043 if (*local_got > 0)
2044 {
2045 *local_got = s->size;
2046 s->size += GOT_ENTRY_SIZE;
2047 if (*local_tls_type == GOT_TLS_GD)
2048 s->size += GOT_ENTRY_SIZE;
2049 if (info->shared)
2050 srela->size += sizeof (Elf64_External_Rela);
2051 }
2052 else
2053 *local_got = (bfd_vma) -1;
2054 }
2055 }
2056
2057 if (htab->tls_ldm_got.refcount > 0)
2058 {
2059 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64
2060 relocs. */
2061 htab->tls_ldm_got.offset = htab->sgot->size;
2062 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2063 htab->srelgot->size += sizeof (Elf64_External_Rela);
2064 }
2065 else
2066 htab->tls_ldm_got.offset = -1;
2067
2068 /* Allocate global sym .plt and .got entries, and space for global
2069 sym dynamic relocs. */
2070 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2071
2072 /* We now have determined the sizes of the various dynamic sections.
2073 Allocate memory for them. */
2074 relocs = FALSE;
2075 for (s = dynobj->sections; s != NULL; s = s->next)
2076 {
2077 if ((s->flags & SEC_LINKER_CREATED) == 0)
2078 continue;
2079
2080 if (s == htab->splt
2081 || s == htab->sgot
2082 || s == htab->sgotplt
2083 || s == htab->sdynbss)
2084 {
2085 /* Strip this section if we don't need it; see the
2086 comment below. */
2087 }
2088 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
2089 {
2090 if (s->size != 0 && s != htab->srelplt)
2091 relocs = TRUE;
2092
2093 /* We use the reloc_count field as a counter if we need
2094 to copy relocs into the output file. */
2095 s->reloc_count = 0;
2096 }
2097 else
2098 {
2099 /* It's not one of our sections, so don't allocate space. */
2100 continue;
2101 }
2102
2103 if (s->size == 0)
2104 {
2105 /* If we don't need this section, strip it from the
2106 output file. This is to handle .rela.bss and
2107 .rela.plt. We must create it in
2108 create_dynamic_sections, because it must be created
2109 before the linker maps input sections to output
2110 sections. The linker does that before
2111 adjust_dynamic_symbol is called, and it is that
2112 function which decides whether anything needs to go
2113 into these sections. */
2114
2115 s->flags |= SEC_EXCLUDE;
2116 continue;
2117 }
2118
2119 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2120 continue;
2121
2122 /* Allocate memory for the section contents. We use bfd_zalloc
2123 here in case unused entries are not reclaimed before the
2124 section's contents are written out. This should not happen,
2125 but this way if it does, we get a R_390_NONE reloc instead
2126 of garbage. */
2127 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2128 if (s->contents == NULL)
2129 return FALSE;
2130 }
2131
2132 if (htab->elf.dynamic_sections_created)
2133 {
2134 /* Add some entries to the .dynamic section. We fill in the
2135 values later, in elf_s390_finish_dynamic_sections, but we
2136 must add the entries now so that we get the correct size for
2137 the .dynamic section. The DT_DEBUG entry is filled in by the
2138 dynamic linker and used by the debugger. */
2139#define add_dynamic_entry(TAG, VAL) \
2140 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2141
2142 if (info->executable)
2143 {
2144 if (!add_dynamic_entry (DT_DEBUG, 0))
2145 return FALSE;
2146 }
2147
2148 if (htab->splt->size != 0)
2149 {
2150 if (!add_dynamic_entry (DT_PLTGOT, 0)
2151 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2152 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2153 || !add_dynamic_entry (DT_JMPREL, 0))
2154 return FALSE;
2155 }
2156
2157 if (relocs)
2158 {
2159 if (!add_dynamic_entry (DT_RELA, 0)
2160 || !add_dynamic_entry (DT_RELASZ, 0)
2161 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2162 return FALSE;
2163
2164 /* If any dynamic relocs apply to a read-only section,
2165 then we need a DT_TEXTREL entry. */
2166 if ((info->flags & DF_TEXTREL) == 0)
2167 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2168 (PTR) info);
2169
2170 if ((info->flags & DF_TEXTREL) != 0)
2171 {
2172 if (!add_dynamic_entry (DT_TEXTREL, 0))
2173 return FALSE;
2174 }
2175 }
2176 }
2177#undef add_dynamic_entry
2178
2179 return TRUE;
2180}
2181
2182/* Return the base VMA address which should be subtracted from real addresses
2183 when resolving @dtpoff relocation.
2184 This is PT_TLS segment p_vaddr. */
2185
2186static bfd_vma
2187dtpoff_base (info)
2188 struct bfd_link_info *info;
2189{
2190 /* If tls_sec is NULL, we should have signalled an error already. */
2191 if (elf_hash_table (info)->tls_sec == NULL)
2192 return 0;
2193 return elf_hash_table (info)->tls_sec->vma;
2194}
2195
2196/* Return the relocation value for @tpoff relocation
2197 if STT_TLS virtual address is ADDRESS. */
2198
2199static bfd_vma
2200tpoff (info, address)
2201 struct bfd_link_info *info;
2202 bfd_vma address;
2203{
2204 struct elf_link_hash_table *htab = elf_hash_table (info);
2205
2206 /* If tls_sec is NULL, we should have signalled an error already. */
2207 if (htab->tls_sec == NULL)
2208 return 0;
2209 return htab->tls_size + htab->tls_sec->vma - address;
2210}
2211
2212/* Complain if TLS instruction relocation is against an invalid
2213 instruction. */
2214
2215static void
2216invalid_tls_insn (input_bfd, input_section, rel)
2217 bfd *input_bfd;
2218 asection *input_section;
2219 Elf_Internal_Rela *rel;
2220{
2221 reloc_howto_type *howto;
2222
2223 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
2224 (*_bfd_error_handler)
2225 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2226 input_bfd,
2227 input_section,
2228 (long) rel->r_offset,
2229 howto->name);
2230}
2231
2232/* Relocate a 390 ELF section. */
2233
2234static bfd_boolean
2235elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2236 contents, relocs, local_syms, local_sections)
2237 bfd *output_bfd;
2238 struct bfd_link_info *info;
2239 bfd *input_bfd;
2240 asection *input_section;
2241 bfd_byte *contents;
2242 Elf_Internal_Rela *relocs;
2243 Elf_Internal_Sym *local_syms;
2244 asection **local_sections;
2245{
2246 struct elf_s390_link_hash_table *htab;
2247 Elf_Internal_Shdr *symtab_hdr;
2248 struct elf_link_hash_entry **sym_hashes;
2249 bfd_vma *local_got_offsets;
2250 Elf_Internal_Rela *rel;
2251 Elf_Internal_Rela *relend;
2252
2253 if (info->relocatable)
2254 return TRUE;
2255
2256 htab = elf_s390_hash_table (info);
2257 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2258 sym_hashes = elf_sym_hashes (input_bfd);
2259 local_got_offsets = elf_local_got_offsets (input_bfd);
2260
2261 rel = relocs;
2262 relend = relocs + input_section->reloc_count;
2263 for (; rel < relend; rel++)
2264 {
2265 unsigned int r_type;
2266 reloc_howto_type *howto;
2267 unsigned long r_symndx;
2268 struct elf_link_hash_entry *h;
2269 Elf_Internal_Sym *sym;
2270 asection *sec;
2271 bfd_vma off;
2272 bfd_vma relocation;
2273 bfd_boolean unresolved_reloc;
2274 bfd_reloc_status_type r;
2275 int tls_type;
2276
2277 r_type = ELF64_R_TYPE (rel->r_info);
2278 if (r_type == (int) R_390_GNU_VTINHERIT
2279 || r_type == (int) R_390_GNU_VTENTRY)
2280 continue;
2281 if (r_type >= (int) R_390_max)
2282 {
2283 bfd_set_error (bfd_error_bad_value);
2284 return FALSE;
2285 }
2286
2287 howto = elf_howto_table + r_type;
2288 r_symndx = ELF64_R_SYM (rel->r_info);
2289
2290 /* This is a final link. */
2291 h = NULL;
2292 sym = NULL;
2293 sec = NULL;
2294 unresolved_reloc = FALSE;
2295 if (r_symndx < symtab_hdr->sh_info)
2296 {
2297 sym = local_syms + r_symndx;
2298 sec = local_sections[r_symndx];
2299 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2300 }
2301 else
2302 {
2303 bfd_boolean warned ATTRIBUTE_UNUSED;
2304
2305 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2306 r_symndx, symtab_hdr, sym_hashes,
2307 h, sec, relocation,
2308 unresolved_reloc, warned);
2309 }
2310
2311 switch (r_type)
2312 {
2313 case R_390_GOTPLT12:
2314 case R_390_GOTPLT16:
2315 case R_390_GOTPLT20:
2316 case R_390_GOTPLT32:
2317 case R_390_GOTPLT64:
2318 case R_390_GOTPLTENT:
2319 /* There are three cases for a GOTPLT relocation. 1) The
2320 relocation is against the jump slot entry of a plt that
2321 will get emitted to the output file. 2) The relocation
2322 is against the jump slot of a plt entry that has been
2323 removed. elf_s390_adjust_gotplt has created a GOT entry
2324 as replacement. 3) The relocation is against a local symbol.
2325 Cases 2) and 3) are the same as the GOT relocation code
2326 so we just have to test for case 1 and fall through for
2327 the other two. */
2328 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2329 {
2330 bfd_vma plt_index;
2331
2332 /* Calc. index no.
2333 Current offset - size first entry / entry size. */
2334 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2335 PLT_ENTRY_SIZE;
2336
2337 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2338 addr & GOT addr. */
2339 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2340 unresolved_reloc = FALSE;
2341
2342 if (r_type == R_390_GOTPLTENT)
2343 relocation += htab->sgot->output_section->vma;
2344 break;
2345 }
2346 /* Fall through. */
2347
2348 case R_390_GOT12:
2349 case R_390_GOT16:
2350 case R_390_GOT20:
2351 case R_390_GOT32:
2352 case R_390_GOT64:
2353 case R_390_GOTENT:
2354 /* Relocation is to the entry for this symbol in the global
2355 offset table. */
2356 if (htab->sgot == NULL)
2357 abort ();
2358
2359 if (h != NULL)
2360 {
2361 bfd_boolean dyn;
2362
2363 off = h->got.offset;
2364 dyn = htab->elf.dynamic_sections_created;
2365 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2366 || (info->shared
2367 && (info->symbolic
2368 || h->dynindx == -1
2369 || h->forced_local)
2370 && h->def_regular)
2371 || (ELF_ST_VISIBILITY (h->other)
2372 && h->root.type == bfd_link_hash_undefweak))
2373 {
2374 /* This is actually a static link, or it is a
2375 -Bsymbolic link and the symbol is defined
2376 locally, or the symbol was forced to be local
2377 because of a version file. We must initialize
2378 this entry in the global offset table. Since the
2379 offset must always be a multiple of 2, we use the
2380 least significant bit to record whether we have
2381 initialized it already.
2382
2383 When doing a dynamic link, we create a .rel.got
2384 relocation entry to initialize the value. This
2385 is done in the finish_dynamic_symbol routine. */
2386 if ((off & 1) != 0)
2387 off &= ~1;
2388 else
2389 {
2390 bfd_put_64 (output_bfd, relocation,
2391 htab->sgot->contents + off);
2392 h->got.offset |= 1;
2393 }
2394 }
2395 else
2396 unresolved_reloc = FALSE;
2397 }
2398 else
2399 {
2400 if (local_got_offsets == NULL)
2401 abort ();
2402
2403 off = local_got_offsets[r_symndx];
2404
2405 /* The offset must always be a multiple of 8. We use
2406 the least significant bit to record whether we have
2407 already generated the necessary reloc. */
2408 if ((off & 1) != 0)
2409 off &= ~1;
2410 else
2411 {
2412 bfd_put_64 (output_bfd, relocation,
2413 htab->sgot->contents + off);
2414
2415 if (info->shared)
2416 {
2417 asection *s;
2418 Elf_Internal_Rela outrel;
2419 bfd_byte *loc;
2420
2421 s = htab->srelgot;
2422 if (s == NULL)
2423 abort ();
2424
2425 outrel.r_offset = (htab->sgot->output_section->vma
2426 + htab->sgot->output_offset
2427 + off);
2428 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2429 outrel.r_addend = relocation;
2430 loc = s->contents;
2431 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2432 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2433 }
2434
2435 local_got_offsets[r_symndx] |= 1;
2436 }
2437 }
2438
2439 if (off >= (bfd_vma) -2)
2440 abort ();
2441
2442 relocation = htab->sgot->output_offset + off;
2443
2444 /* For @GOTENT the relocation is against the offset between
2445 the instruction and the symbols entry in the GOT and not
2446 between the start of the GOT and the symbols entry. We
2447 add the vma of the GOT to get the correct value. */
2448 if ( r_type == R_390_GOTENT
2449 || r_type == R_390_GOTPLTENT)
2450 relocation += htab->sgot->output_section->vma;
2451
2452 break;
2453
2454 case R_390_GOTOFF16:
2455 case R_390_GOTOFF32:
2456 case R_390_GOTOFF64:
2457 /* Relocation is relative to the start of the global offset
2458 table. */
2459
2460 /* Note that sgot->output_offset is not involved in this
2461 calculation. We always want the start of .got. If we
2462 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2463 permitted by the ABI, we might have to change this
2464 calculation. */
2465 relocation -= htab->sgot->output_section->vma;
2466 break;
2467
2468 case R_390_GOTPC:
2469 case R_390_GOTPCDBL:
2470 /* Use global offset table as symbol value. */
2471 relocation = htab->sgot->output_section->vma;
2472 unresolved_reloc = FALSE;
2473 break;
2474
2475 case R_390_PLT16DBL:
2476 case R_390_PLT32:
2477 case R_390_PLT32DBL:
2478 case R_390_PLT64:
2479 /* Relocation is to the entry for this symbol in the
2480 procedure linkage table. */
2481
2482 /* Resolve a PLT32 reloc against a local symbol directly,
2483 without using the procedure linkage table. */
2484 if (h == NULL)
2485 break;
2486
2487 if (h->plt.offset == (bfd_vma) -1
2488 || htab->splt == NULL)
2489 {
2490 /* We didn't make a PLT entry for this symbol. This
2491 happens when statically linking PIC code, or when
2492 using -Bsymbolic. */
2493 break;
2494 }
2495
2496 relocation = (htab->splt->output_section->vma
2497 + htab->splt->output_offset
2498 + h->plt.offset);
2499 unresolved_reloc = FALSE;
2500 break;
2501
2502 case R_390_PLTOFF16:
2503 case R_390_PLTOFF32:
2504 case R_390_PLTOFF64:
2505 /* Relocation is to the entry for this symbol in the
2506 procedure linkage table relative to the start of the GOT. */
2507
2508 /* For local symbols or if we didn't make a PLT entry for
2509 this symbol resolve the symbol directly. */
2510 if ( h == NULL
2511 || h->plt.offset == (bfd_vma) -1
2512 || htab->splt == NULL)
2513 {
2514 relocation -= htab->sgot->output_section->vma;
2515 break;
2516 }
2517
2518 relocation = (htab->splt->output_section->vma
2519 + htab->splt->output_offset
2520 + h->plt.offset
2521 - htab->sgot->output_section->vma);
2522 unresolved_reloc = FALSE;
2523 break;
2524
2525 case R_390_8:
2526 case R_390_16:
2527 case R_390_32:
2528 case R_390_64:
2529 case R_390_PC16:
2530 case R_390_PC16DBL:
2531 case R_390_PC32:
2532 case R_390_PC32DBL:
2533 case R_390_PC64:
2534 /* r_symndx will be zero only for relocs against symbols
2535 from removed linkonce sections, or sections discarded by
2536 a linker script. */
2537 if (r_symndx == 0
2538 || (input_section->flags & SEC_ALLOC) == 0)
2539 break;
2540
2541 if ((info->shared
2542 && (h == NULL
2543 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2544 || h->root.type != bfd_link_hash_undefweak)
2545 && ((r_type != R_390_PC16
2546 && r_type != R_390_PC16DBL
2547 && r_type != R_390_PC32
2548 && r_type != R_390_PC32DBL
2549 && r_type != R_390_PC64)
2550 || (h != NULL
2551 && !SYMBOL_REFERENCES_LOCAL (info, h))))
2552 || (ELIMINATE_COPY_RELOCS
2553 && !info->shared
2554 && h != NULL
2555 && h->dynindx != -1
2556 && !h->non_got_ref
2557 && ((h->def_dynamic
2558 && !h->def_regular)
2559 || h->root.type == bfd_link_hash_undefweak
2560 || h->root.type == bfd_link_hash_undefined)))
2561 {
2562 Elf_Internal_Rela outrel;
2563 bfd_boolean skip, relocate;
2564 asection *sreloc;
2565 bfd_byte *loc;
2566
2567 /* When generating a shared object, these relocations
2568 are copied into the output file to be resolved at run
2569 time. */
2570 skip = FALSE;
2571 relocate = FALSE;
2572
2573 outrel.r_offset =
2574 _bfd_elf_section_offset (output_bfd, info, input_section,
2575 rel->r_offset);
2576 if (outrel.r_offset == (bfd_vma) -1)
2577 skip = TRUE;
2578 else if (outrel.r_offset == (bfd_vma) -2)
2579 skip = TRUE, relocate = TRUE;
2580
2581 outrel.r_offset += (input_section->output_section->vma
2582 + input_section->output_offset);
2583
2584 if (skip)
2585 memset (&outrel, 0, sizeof outrel);
2586 else if (h != NULL
2587 && h->dynindx != -1
2588 && (r_type == R_390_PC16
2589 || r_type == R_390_PC16DBL
2590 || r_type == R_390_PC32
2591 || r_type == R_390_PC32DBL
2592 || r_type == R_390_PC64
2593 || !info->shared
2594 || !info->symbolic
2595 || !h->def_regular))
2596 {
2597 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2598 outrel.r_addend = rel->r_addend;
2599 }
2600 else
2601 {
2602 /* This symbol is local, or marked to become local. */
2603 outrel.r_addend = relocation + rel->r_addend;
2604 if (r_type == R_390_64)
2605 {
2606 relocate = TRUE;
2607 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2608 }
2609 else
2610 {
2611 long sindx;
2612
2613 if (bfd_is_abs_section (sec))
2614 sindx = 0;
2615 else if (sec == NULL || sec->owner == NULL)
2616 {
2617 bfd_set_error(bfd_error_bad_value);
2618 return FALSE;
2619 }
2620 else
2621 {
2622 asection *osec;
2623
2624 osec = sec->output_section;
2625 sindx = elf_section_data (osec)->dynindx;
2626 BFD_ASSERT (sindx > 0);
2627
2628 /* We are turning this relocation into one
2629 against a section symbol, so subtract out
2630 the output section's address but not the
2631 offset of the input section in the output
2632 section. */
2633
2634 outrel.r_addend -= osec->vma;
2635 }
2636 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2637 }
2638 }
2639
2640 sreloc = elf_section_data (input_section)->sreloc;
2641 if (sreloc == NULL)
2642 abort ();
2643
2644 loc = sreloc->contents;
2645 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2646 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2647
2648 /* If this reloc is against an external symbol, we do
2649 not want to fiddle with the addend. Otherwise, we
2650 need to include the symbol value so that it becomes
2651 an addend for the dynamic reloc. */
2652 if (! relocate)
2653 continue;
2654 }
2655
2656 break;
2657
2658 /* Relocations for tls literal pool entries. */
2659 case R_390_TLS_IE64:
2660 if (info->shared)
2661 {
2662 Elf_Internal_Rela outrel;
2663 asection *sreloc;
2664 bfd_byte *loc;
2665
2666 outrel.r_offset = rel->r_offset
2667 + input_section->output_section->vma
2668 + input_section->output_offset;
2669 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2670 sreloc = elf_section_data (input_section)->sreloc;
2671 if (sreloc == NULL)
2672 abort ();
2673 loc = sreloc->contents;
2674 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2675 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2676 }
2677 /* Fall through. */
2678
2679 case R_390_TLS_GD64:
2680 case R_390_TLS_GOTIE64:
2681 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2682 tls_type = GOT_UNKNOWN;
2683 if (h == NULL && local_got_offsets)
2684 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2685 else if (h != NULL)
2686 {
2687 tls_type = elf_s390_hash_entry(h)->tls_type;
2688 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2689 r_type = R_390_TLS_LE64;
2690 }
2691 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2692 r_type = R_390_TLS_IE64;
2693
2694 if (r_type == R_390_TLS_LE64)
2695 {
2696 /* This relocation gets optimized away by the local exec
2697 access optimization. */
2698 BFD_ASSERT (! unresolved_reloc);
2699 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2700 contents + rel->r_offset);
2701 continue;
2702 }
2703
2704 if (htab->sgot == NULL)
2705 abort ();
2706
2707 if (h != NULL)
2708 off = h->got.offset;
2709 else
2710 {
2711 if (local_got_offsets == NULL)
2712 abort ();
2713
2714 off = local_got_offsets[r_symndx];
2715 }
2716
2717 emit_tls_relocs:
2718
2719 if ((off & 1) != 0)
2720 off &= ~1;
2721 else
2722 {
2723 Elf_Internal_Rela outrel;
2724 bfd_byte *loc;
2725 int dr_type, indx;
2726
2727 if (htab->srelgot == NULL)
2728 abort ();
2729
2730 outrel.r_offset = (htab->sgot->output_section->vma
2731 + htab->sgot->output_offset + off);
2732
2733 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2734 if (r_type == R_390_TLS_GD64)
2735 dr_type = R_390_TLS_DTPMOD;
2736 else
2737 dr_type = R_390_TLS_TPOFF;
2738 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2739 outrel.r_addend = relocation - dtpoff_base (info);
2740 else
2741 outrel.r_addend = 0;
2742 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2743 loc = htab->srelgot->contents;
2744 loc += htab->srelgot->reloc_count++
2745 * sizeof (Elf64_External_Rela);
2746 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2747
2748 if (r_type == R_390_TLS_GD64)
2749 {
2750 if (indx == 0)
2751 {
2752 BFD_ASSERT (! unresolved_reloc);
2753 bfd_put_64 (output_bfd,
2754 relocation - dtpoff_base (info),
2755 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2756 }
2757 else
2758 {
2759 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
2760 outrel.r_offset += GOT_ENTRY_SIZE;
2761 outrel.r_addend = 0;
2762 htab->srelgot->reloc_count++;
2763 loc += sizeof (Elf64_External_Rela);
2764 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2765 }
2766 }
2767
2768 if (h != NULL)
2769 h->got.offset |= 1;
2770 else
2771 local_got_offsets[r_symndx] |= 1;
2772 }
2773
2774 if (off >= (bfd_vma) -2)
2775 abort ();
2776 if (r_type == ELF64_R_TYPE (rel->r_info))
2777 {
2778 relocation = htab->sgot->output_offset + off;
2779 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
2780 relocation += htab->sgot->output_section->vma;
2781 unresolved_reloc = FALSE;
2782 }
2783 else
2784 {
2785 bfd_put_64 (output_bfd, htab->sgot->output_offset + off,
2786 contents + rel->r_offset);
2787 continue;
2788 }
2789 break;
2790
2791 case R_390_TLS_GOTIE12:
2792 case R_390_TLS_GOTIE20:
2793 case R_390_TLS_IEENT:
2794 if (h == NULL)
2795 {
2796 if (local_got_offsets == NULL)
2797 abort();
2798 off = local_got_offsets[r_symndx];
2799 if (info->shared)
2800 goto emit_tls_relocs;
2801 }
2802 else
2803 {
2804 off = h->got.offset;
2805 tls_type = elf_s390_hash_entry(h)->tls_type;
2806 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2807 goto emit_tls_relocs;
2808 }
2809
2810 if (htab->sgot == NULL)
2811 abort ();
2812
2813 BFD_ASSERT (! unresolved_reloc);
2814 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2815 htab->sgot->contents + off);
2816 relocation = htab->sgot->output_offset + off;
2817 if (r_type == R_390_TLS_IEENT)
2818 relocation += htab->sgot->output_section->vma;
2819 unresolved_reloc = FALSE;
2820 break;
2821
2822 case R_390_TLS_LDM64:
2823 if (! info->shared)
2824 /* The literal pool entry this relocation refers to gets ignored
2825 by the optimized code of the local exec model. Do nothing
2826 and the value will turn out zero. */
2827 continue;
2828
2829 if (htab->sgot == NULL)
2830 abort ();
2831
2832 off = htab->tls_ldm_got.offset;
2833 if (off & 1)
2834 off &= ~1;
2835 else
2836 {
2837 Elf_Internal_Rela outrel;
2838 bfd_byte *loc;
2839
2840 if (htab->srelgot == NULL)
2841 abort ();
2842
2843 outrel.r_offset = (htab->sgot->output_section->vma
2844 + htab->sgot->output_offset + off);
2845
2846 bfd_put_64 (output_bfd, 0,
2847 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2848 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
2849 outrel.r_addend = 0;
2850 loc = htab->srelgot->contents;
2851 loc += htab->srelgot->reloc_count++
2852 * sizeof (Elf64_External_Rela);
2853 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2854 htab->tls_ldm_got.offset |= 1;
2855 }
2856 relocation = htab->sgot->output_offset + off;
2857 unresolved_reloc = FALSE;
2858 break;
2859
2860 case R_390_TLS_LE64:
2861 if (info->shared)
2862 {
2863 /* Linking a shared library with non-fpic code requires
2864 a R_390_TLS_TPOFF relocation. */
2865 Elf_Internal_Rela outrel;
2866 asection *sreloc;
2867 bfd_byte *loc;
2868 int indx;
2869
2870 outrel.r_offset = rel->r_offset
2871 + input_section->output_section->vma
2872 + input_section->output_offset;
2873 if (h != NULL && h->dynindx != -1)
2874 indx = h->dynindx;
2875 else
2876 indx = 0;
2877 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
2878 if (indx == 0)
2879 outrel.r_addend = relocation - dtpoff_base (info);
2880 else
2881 outrel.r_addend = 0;
2882 sreloc = elf_section_data (input_section)->sreloc;
2883 if (sreloc == NULL)
2884 abort ();
2885 loc = sreloc->contents;
2886 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2887 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2888 }
2889 else
2890 {
2891 BFD_ASSERT (! unresolved_reloc);
2892 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2893 contents + rel->r_offset);
2894 }
2895 continue;
2896
2897 case R_390_TLS_LDO64:
2898 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2899 relocation -= dtpoff_base (info);
2900 else
2901 /* When converting LDO to LE, we must negate. */
2902 relocation = -tpoff (info, relocation);
2903 break;
2904
2905 /* Relocations for tls instructions. */
2906 case R_390_TLS_LOAD:
2907 case R_390_TLS_GDCALL:
2908 case R_390_TLS_LDCALL:
2909 tls_type = GOT_UNKNOWN;
2910 if (h == NULL && local_got_offsets)
2911 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2912 else if (h != NULL)
2913 tls_type = elf_s390_hash_entry(h)->tls_type;
2914
2915 if (tls_type == GOT_TLS_GD)
2916 continue;
2917
2918 if (r_type == R_390_TLS_LOAD)
2919 {
2920 if (!info->shared && (h == NULL || h->dynindx == -1))
2921 {
2922 /* IE->LE transition. Four valid cases:
2923 lg %rx,(0,%ry) -> sllg %rx,%ry,0
2924 lg %rx,(%ry,0) -> sllg %rx,%ry,0
2925 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
2926 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
2927 unsigned int insn0, insn1, ry;
2928
2929 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2930 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2931 if (insn1 != 0x0004)
2932 invalid_tls_insn (input_bfd, input_section, rel);
2933 ry = 0;
2934 if ((insn0 & 0xff00f000) == 0xe3000000)
2935 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
2936 ry = (insn0 & 0x000f0000);
2937 else if ((insn0 & 0xff0f0000) == 0xe3000000)
2938 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
2939 ry = (insn0 & 0x0000f000) << 4;
2940 else if ((insn0 & 0xff00f000) == 0xe300c000)
2941 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
2942 ry = (insn0 & 0x000f0000);
2943 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
2944 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
2945 ry = (insn0 & 0x0000f000) << 4;
2946 else
2947 invalid_tls_insn (input_bfd, input_section, rel);
2948 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
2949 insn1 = 0x000d;
2950 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2951 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2952 }
2953 }
2954 else if (r_type == R_390_TLS_GDCALL)
2955 {
2956 unsigned int insn0, insn1;
2957
2958 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2959 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2960 if ((insn0 & 0xffff0000) != 0xc0e50000)
2961 invalid_tls_insn (input_bfd, input_section, rel);
2962 if (!info->shared && (h == NULL || h->dynindx == -1))
2963 {
2964 /* GD->LE transition.
2965 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2966 insn0 = 0xc0040000;
2967 insn1 = 0x0000;
2968 }
2969 else
2970 {
2971 /* GD->IE transition.
2972 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
2973 insn0 = 0xe322c000;
2974 insn1 = 0x0004;
2975 }
2976 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2977 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2978 }
2979 else if (r_type == R_390_TLS_LDCALL)
2980 {
2981 if (!info->shared)
2982 {
2983 unsigned int insn0, insn1;
2984
2985 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2986 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2987 if ((insn0 & 0xffff0000) != 0xc0e50000)
2988 invalid_tls_insn (input_bfd, input_section, rel);
2989 /* LD->LE transition.
2990 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2991 insn0 = 0xc0040000;
2992 insn1 = 0x0000;
2993 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2994 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2995 }
2996 }
2997 continue;
2998
2999 default:
3000 break;
3001 }
3002
3003 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3004 because such sections are not SEC_ALLOC and thus ld.so will
3005 not process them. */
3006 if (unresolved_reloc
3007 && !((input_section->flags & SEC_DEBUGGING) != 0
3008 && h->def_dynamic))
3009 (*_bfd_error_handler)
3010 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3011 input_bfd,
3012 input_section,
3013 (long) rel->r_offset,
3014 howto->name,
3015 h->root.root.string);
3016
3017 if (r_type == R_390_20
3018 || r_type == R_390_GOT20
3019 || r_type == R_390_GOTPLT20
3020 || r_type == R_390_TLS_GOTIE20)
3021 {
3022 relocation += rel->r_addend;
3023 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3024 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3025 contents, rel->r_offset,
3026 relocation, 0);
3027 }
3028 else
3029 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3030 contents, rel->r_offset,
3031 relocation, rel->r_addend);
3032
3033 if (r != bfd_reloc_ok)
3034 {
3035 const char *name;
3036
3037 if (h != NULL)
3038 name = h->root.root.string;
3039 else
3040 {
3041 name = bfd_elf_string_from_elf_section (input_bfd,
3042 symtab_hdr->sh_link,
3043 sym->st_name);
3044 if (name == NULL)
3045 return FALSE;
3046 if (*name == '\0')
3047 name = bfd_section_name (input_bfd, sec);
3048 }
3049
3050 if (r == bfd_reloc_overflow)
3051 {
3052
3053 if (! ((*info->callbacks->reloc_overflow)
3054 (info, (h ? &h->root : NULL), name, howto->name,
3055 (bfd_vma) 0, input_bfd, input_section,
3056 rel->r_offset)))
3057 return FALSE;
3058 }
3059 else
3060 {
3061 (*_bfd_error_handler)
3062 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3063 input_bfd, input_section,
3064 (long) rel->r_offset, name, (int) r);
3065 return FALSE;
3066 }
3067 }
3068 }
3069
3070 return TRUE;
3071}
3072
3073/* Finish up dynamic symbol handling. We set the contents of various
3074 dynamic sections here. */
3075
3076static bfd_boolean
3077elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3078 bfd *output_bfd;
3079 struct bfd_link_info *info;
3080 struct elf_link_hash_entry *h;
3081 Elf_Internal_Sym *sym;
3082{
3083 struct elf_s390_link_hash_table *htab;
3084
3085 htab = elf_s390_hash_table (info);
3086
3087 if (h->plt.offset != (bfd_vma) -1)
3088 {
3089 bfd_vma plt_index;
3090 bfd_vma got_offset;
3091 Elf_Internal_Rela rela;
3092 bfd_byte *loc;
3093
3094 /* This symbol has an entry in the procedure linkage table. Set
3095 it up. */
3096
3097 if (h->dynindx == -1
3098 || htab->splt == NULL
3099 || htab->sgotplt == NULL
3100 || htab->srelplt == NULL)
3101 abort ();
3102
3103 /* Calc. index no.
3104 Current offset - size first entry / entry size. */
3105 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3106
3107 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
3108 addr & GOT addr. */
3109 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3110
3111 /* Fill in the blueprint of a PLT. */
3112 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3113 htab->splt->contents + h->plt.offset);
3114 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3115 htab->splt->contents + h->plt.offset + 4);
3116 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3117 htab->splt->contents + h->plt.offset + 8);
3118 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3119 htab->splt->contents + h->plt.offset + 12);
3120 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3121 htab->splt->contents + h->plt.offset + 16);
3122 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5,
3123 htab->splt->contents + h->plt.offset + 20);
3124 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6,
3125 htab->splt->contents + h->plt.offset + 24);
3126 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7,
3127 htab->splt->contents + h->plt.offset + 28);
3128 /* Fixup the relative address to the GOT entry */
3129 bfd_put_32 (output_bfd,
3130 (htab->sgotplt->output_section->vma +
3131 htab->sgotplt->output_offset + got_offset
3132 - (htab->splt->output_section->vma + h->plt.offset))/2,
3133 htab->splt->contents + h->plt.offset + 2);
3134 /* Fixup the relative branch to PLT 0 */
3135 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3136 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3137 htab->splt->contents + h->plt.offset + 24);
3138 /* Fixup offset into symbol table */
3139 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3140 htab->splt->contents + h->plt.offset + 28);
3141
3142 /* Fill in the entry in the global offset table.
3143 Points to instruction after GOT offset. */
3144 bfd_put_64 (output_bfd,
3145 (htab->splt->output_section->vma
3146 + htab->splt->output_offset
3147 + h->plt.offset
3148 + 14),
3149 htab->sgotplt->contents + got_offset);
3150
3151 /* Fill in the entry in the .rela.plt section. */
3152 rela.r_offset = (htab->sgotplt->output_section->vma
3153 + htab->sgotplt->output_offset
3154 + got_offset);
3155 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3156 rela.r_addend = 0;
3157 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela);
3158 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3159
3160 if (!h->def_regular)
3161 {
3162 /* Mark the symbol as undefined, rather than as defined in
3163 the .plt section. Leave the value alone. This is a clue
3164 for the dynamic linker, to make function pointer
3165 comparisons work between an application and shared
3166 library. */
3167 sym->st_shndx = SHN_UNDEF;
3168 }
3169 }
3170
3171 if (h->got.offset != (bfd_vma) -1
3172 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3173 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3174 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3175 {
3176 Elf_Internal_Rela rela;
3177 bfd_byte *loc;
3178
3179 /* This symbol has an entry in the global offset table. Set it
3180 up. */
3181 if (htab->sgot == NULL || htab->srelgot == NULL)
3182 abort ();
3183
3184 rela.r_offset = (htab->sgot->output_section->vma
3185 + htab->sgot->output_offset
3186 + (h->got.offset &~ (bfd_vma) 1));
3187
3188 /* If this is a static link, or it is a -Bsymbolic link and the
3189 symbol is defined locally or was forced to be local because
3190 of a version file, we just want to emit a RELATIVE reloc.
3191 The entry in the global offset table will already have been
3192 initialized in the relocate_section function. */
3193 if (info->shared
3194 && (info->symbolic
3195 || h->dynindx == -1
3196 || h->forced_local)
3197 && h->def_regular)
3198 {
3199 BFD_ASSERT((h->got.offset & 1) != 0);
3200 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3201 rela.r_addend = (h->root.u.def.value
3202 + h->root.u.def.section->output_section->vma
3203 + h->root.u.def.section->output_offset);
3204 }
3205 else
3206 {
3207 BFD_ASSERT((h->got.offset & 1) == 0);
3208 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3209 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3210 rela.r_addend = 0;
3211 }
3212
3213 loc = htab->srelgot->contents;
3214 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3215 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3216 }
3217
3218 if (h->needs_copy)
3219 {
3220 Elf_Internal_Rela rela;
3221 bfd_byte *loc;
3222
3223 /* This symbols needs a copy reloc. Set it up. */
3224
3225 if (h->dynindx == -1
3226 || (h->root.type != bfd_link_hash_defined
3227 && h->root.type != bfd_link_hash_defweak)
3228 || htab->srelbss == NULL)
3229 abort ();
3230
3231 rela.r_offset = (h->root.u.def.value
3232 + h->root.u.def.section->output_section->vma
3233 + h->root.u.def.section->output_offset);
3234 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3235 rela.r_addend = 0;
3236 loc = htab->srelbss->contents;
3237 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3238 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3239 }
3240
3241 /* Mark some specially defined symbols as absolute. */
3242 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3243 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
3244 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
3245 sym->st_shndx = SHN_ABS;
3246
3247 return TRUE;
3248}
3249
3250/* Used to decide how to sort relocs in an optimal manner for the
3251 dynamic linker, before writing them out. */
3252
3253static enum elf_reloc_type_class
3254elf_s390_reloc_type_class (rela)
3255 const Elf_Internal_Rela *rela;
3256{
3257 switch ((int) ELF64_R_TYPE (rela->r_info))
3258 {
3259 case R_390_RELATIVE:
3260 return reloc_class_relative;
3261 case R_390_JMP_SLOT:
3262 return reloc_class_plt;
3263 case R_390_COPY:
3264 return reloc_class_copy;
3265 default:
3266 return reloc_class_normal;
3267 }
3268}
3269
3270/* Finish up the dynamic sections. */
3271
3272static bfd_boolean
3273elf_s390_finish_dynamic_sections (output_bfd, info)
3274 bfd *output_bfd;
3275 struct bfd_link_info *info;
3276{
3277 struct elf_s390_link_hash_table *htab;
3278 bfd *dynobj;
3279 asection *sdyn;
3280
3281 htab = elf_s390_hash_table (info);
3282 dynobj = htab->elf.dynobj;
3283 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3284
3285 if (htab->elf.dynamic_sections_created)
3286 {
3287 Elf64_External_Dyn *dyncon, *dynconend;
3288
3289 if (sdyn == NULL || htab->sgot == NULL)
3290 abort ();
3291
3292 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3293 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3294 for (; dyncon < dynconend; dyncon++)
3295 {
3296 Elf_Internal_Dyn dyn;
3297 asection *s;
3298
3299 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3300
3301 switch (dyn.d_tag)
3302 {
3303 default:
3304 continue;
3305
3306 case DT_PLTGOT:
3307 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3308 break;
3309
3310 case DT_JMPREL:
3311 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3312 break;
3313
3314 case DT_PLTRELSZ:
3315 s = htab->srelplt->output_section;
3316 dyn.d_un.d_val = s->size;
3317 break;
3318
3319 case DT_RELASZ:
3320 /* The procedure linkage table relocs (DT_JMPREL) should
3321 not be included in the overall relocs (DT_RELA).
3322 Therefore, we override the DT_RELASZ entry here to
3323 make it not include the JMPREL relocs. Since the
3324 linker script arranges for .rela.plt to follow all
3325 other relocation sections, we don't have to worry
3326 about changing the DT_RELA entry. */
3327 s = htab->srelplt->output_section;
3328 dyn.d_un.d_val -= s->size;
3329 break;
3330 }
3331
3332 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3333 }
3334
3335 /* Fill in the special first entry in the procedure linkage table. */
3336 if (htab->splt && htab->splt->size > 0)
3337 {
3338 /* fill in blueprint for plt 0 entry */
3339 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0,
3340 htab->splt->contents );
3341 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3342 htab->splt->contents +4 );
3343 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3344 htab->splt->contents +12 );
3345 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3346 htab->splt->contents +16 );
3347 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3348 htab->splt->contents +20 );
3349 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6,
3350 htab->splt->contents + 24);
3351 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7,
3352 htab->splt->contents + 28 );
3353 /* Fixup relative address to start of GOT */
3354 bfd_put_32 (output_bfd,
3355 (htab->sgotplt->output_section->vma +
3356 htab->sgotplt->output_offset
3357 - htab->splt->output_section->vma - 6)/2,
3358 htab->splt->contents + 8);
3359 }
3360 elf_section_data (htab->splt->output_section)
3361 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE;
3362 }
3363
3364 if (htab->sgotplt)
3365 {
3366 /* Fill in the first three entries in the global offset table. */
3367 if (htab->sgotplt->size > 0)
3368 {
3369 bfd_put_64 (output_bfd,
3370 (sdyn == NULL ? (bfd_vma) 0
3371 : sdyn->output_section->vma + sdyn->output_offset),
3372 htab->sgotplt->contents);
3373 /* One entry for shared object struct ptr. */
3374 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3375 /* One entry for _dl_runtime_resolve. */
3376 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12);
3377 }
3378
3379 elf_section_data (htab->sgot->output_section)
3380 ->this_hdr.sh_entsize = 8;
3381 }
3382 return TRUE;
3383}
3384
3385/* Return address for Ith PLT stub in section PLT, for relocation REL
3386 or (bfd_vma) -1 if it should not be included. */
3387
3388static bfd_vma
3389elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3390 const arelent *rel ATTRIBUTE_UNUSED)
3391{
3392 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3393}
3394
3395
3396/* Why was the hash table entry size definition changed from
3397 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3398 this is the only reason for the s390_elf64_size_info structure. */
3399
3400const struct elf_size_info s390_elf64_size_info =
3401{
3402 sizeof (Elf64_External_Ehdr),
3403 sizeof (Elf64_External_Phdr),
3404 sizeof (Elf64_External_Shdr),
3405 sizeof (Elf64_External_Rel),
3406 sizeof (Elf64_External_Rela),
3407 sizeof (Elf64_External_Sym),
3408 sizeof (Elf64_External_Dyn),
3409 sizeof (Elf_External_Note),
3410 8, /* hash-table entry size. */
3411 1, /* internal relocations per external relocations. */
3412 64, /* arch_size. */
3413 3, /* log_file_align. */
3414 ELFCLASS64, EV_CURRENT,
3415 bfd_elf64_write_out_phdrs,
3416 bfd_elf64_write_shdrs_and_ehdr,
3417 bfd_elf64_write_relocs,
3418 bfd_elf64_swap_symbol_in,
3419 bfd_elf64_swap_symbol_out,
3420 bfd_elf64_slurp_reloc_table,
3421 bfd_elf64_slurp_symbol_table,
3422 bfd_elf64_swap_dyn_in,
3423 bfd_elf64_swap_dyn_out,
3424 bfd_elf64_swap_reloc_in,
3425 bfd_elf64_swap_reloc_out,
3426 bfd_elf64_swap_reloca_in,
3427 bfd_elf64_swap_reloca_out
3428};
3429
3430#define TARGET_BIG_SYM bfd_elf64_s390_vec
3431#define TARGET_BIG_NAME "elf64-s390"
3432#define ELF_ARCH bfd_arch_s390
3433#define ELF_MACHINE_CODE EM_S390
3434#define ELF_MACHINE_ALT1 EM_S390_OLD
3435#define ELF_MAXPAGESIZE 0x1000
3436
3437#define elf_backend_size_info s390_elf64_size_info
3438
3439#define elf_backend_can_gc_sections 1
3440#define elf_backend_can_refcount 1
3441#define elf_backend_want_got_plt 1
3442#define elf_backend_plt_readonly 1
3443#define elf_backend_want_plt_sym 0
3444#define elf_backend_got_header_size 24
3445#define elf_backend_rela_normal 1
3446
3447#define elf_info_to_howto elf_s390_info_to_howto
3448
3449#define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3450#define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3451#define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3452
3453#define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3454#define elf_backend_check_relocs elf_s390_check_relocs
3455#define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3456#define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3457#define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3458#define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3459#define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3460#define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3461#define elf_backend_reloc_type_class elf_s390_reloc_type_class
3462#define elf_backend_relocate_section elf_s390_relocate_section
3463#define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3464#define elf_backend_reloc_type_class elf_s390_reloc_type_class
3465#define elf_backend_plt_sym_val elf_s390_plt_sym_val
3466
3467#define bfd_elf64_mkobject elf_s390_mkobject
3468#define elf_backend_object_p elf_s390_object_p
3469
3470#include "elf64-target.h"
GDB Binutils - Deliverables
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