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