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gas/
[binutils.git] / bfd / elf64-s390.c
blob6af39db96aef9db1df909cb63e77228eb6e2c104
1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
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 3 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 "sysdep.h"
24 #include "bfd.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 ((struct bfd_link_info *, 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 struct elf_s390_link_hash_entry;
50 static void elf_s390_adjust_gotplt
51 PARAMS ((struct elf_s390_link_hash_entry *));
52 static bfd_boolean elf_s390_adjust_dynamic_symbol
53 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
54 static bfd_boolean allocate_dynrelocs
55 PARAMS ((struct elf_link_hash_entry *, PTR));
56 static bfd_boolean readonly_dynrelocs
57 PARAMS ((struct elf_link_hash_entry *, PTR));
58 static bfd_boolean elf_s390_size_dynamic_sections
59 PARAMS ((bfd *, struct bfd_link_info *));
60 static bfd_boolean elf_s390_relocate_section
61 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
62 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
63 static bfd_boolean elf_s390_finish_dynamic_symbol
64 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
65 Elf_Internal_Sym *));
66 static enum elf_reloc_type_class elf_s390_reloc_type_class
67 PARAMS ((const Elf_Internal_Rela *));
68 static bfd_boolean elf_s390_finish_dynamic_sections
69 PARAMS ((bfd *, struct bfd_link_info *));
70 static bfd_boolean elf_s390_object_p
71 PARAMS ((bfd *));
72 static int elf_s390_tls_transition
73 PARAMS ((struct bfd_link_info *, int, int));
74 static bfd_reloc_status_type s390_tls_reloc
75 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
76 static bfd_vma dtpoff_base
77 PARAMS ((struct bfd_link_info *));
78 static bfd_vma tpoff
79 PARAMS ((struct bfd_link_info *, bfd_vma));
80 static void invalid_tls_insn
81 PARAMS ((bfd *, asection *, Elf_Internal_Rela *));
82 static bfd_reloc_status_type s390_elf_ldisp_reloc
83 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
84
85 #include "elf/s390.h"
86
87 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
88 from smaller values. Start with zero, widen, *then* decrement. */
89 #define MINUS_ONE (((bfd_vma)0) - 1)
90
91 /* The relocation "howto" table. */
92 static reloc_howto_type elf_howto_table[] =
93 {
94 HOWTO (R_390_NONE, /* type */
95 0, /* rightshift */
96 0, /* size (0 = byte, 1 = short, 2 = long) */
97 0, /* bitsize */
98 FALSE, /* pc_relative */
99 0, /* bitpos */
100 complain_overflow_dont, /* complain_on_overflow */
101 bfd_elf_generic_reloc, /* special_function */
102 "R_390_NONE", /* name */
103 FALSE, /* partial_inplace */
104 0, /* src_mask */
105 0, /* dst_mask */
106 FALSE), /* pcrel_offset */
107
108 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
110 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
111 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
112 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
113 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
114 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
115 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
116 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
118 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
120 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
122 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
124 HOWTO(R_390_COPY, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,MINUS_ONE, FALSE),
126 HOWTO(R_390_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,MINUS_ONE, FALSE),
128 HOWTO(R_390_JMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,MINUS_ONE, FALSE),
130 HOWTO(R_390_RELATIVE, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,MINUS_ONE, FALSE),
132 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,MINUS_ONE, FALSE),
134 HOWTO(R_390_GOTPC, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
135 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,MINUS_ONE, TRUE),
136 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
137 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
138 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
140 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
142 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
143 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
144 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
146 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
148 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,MINUS_ONE, TRUE),
150 HOWTO(R_390_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_390_64", FALSE, 0,MINUS_ONE, FALSE),
152 HOWTO(R_390_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
153 bfd_elf_generic_reloc, "R_390_PC64", FALSE, 0,MINUS_ONE, TRUE),
154 HOWTO(R_390_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
155 bfd_elf_generic_reloc, "R_390_GOT64", FALSE, 0,MINUS_ONE, FALSE),
156 HOWTO(R_390_PLT64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
157 bfd_elf_generic_reloc, "R_390_PLT64", FALSE, 0,MINUS_ONE, TRUE),
158 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
159 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,MINUS_ONE, TRUE),
160 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
161 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
162 HOWTO(R_390_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
163 bfd_elf_generic_reloc, "R_390_GOTOFF64", FALSE, 0,MINUS_ONE, FALSE),
164 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
165 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
166 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
167 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
168 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
169 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
170 HOWTO(R_390_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
171 bfd_elf_generic_reloc, "R_390_GOTPLT64", FALSE, 0,MINUS_ONE, FALSE),
172 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
173 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,MINUS_ONE, TRUE),
174 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
175 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
176 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
177 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
178 HOWTO(R_390_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
179 bfd_elf_generic_reloc, "R_390_PLTOFF64", FALSE, 0,MINUS_ONE, FALSE),
180 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont,
181 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE),
182 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
183 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE),
184 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
185 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE),
186 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */
187 HOWTO(R_390_TLS_GD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
188 bfd_elf_generic_reloc, "R_390_TLS_GD64", FALSE, 0, MINUS_ONE, FALSE),
189 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
190 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE),
191 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */
192 HOWTO(R_390_TLS_GOTIE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
193 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", FALSE, 0, MINUS_ONE, FALSE),
194 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */
195 HOWTO(R_390_TLS_LDM64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
196 bfd_elf_generic_reloc, "R_390_TLS_LDM64", FALSE, 0, MINUS_ONE, FALSE),
197 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */
198 HOWTO(R_390_TLS_IE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
199 bfd_elf_generic_reloc, "R_390_TLS_IE64", FALSE, 0, MINUS_ONE, FALSE),
200 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
201 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, MINUS_ONE, TRUE),
202 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */
203 HOWTO(R_390_TLS_LE64, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
204 bfd_elf_generic_reloc, "R_390_TLS_LE64", FALSE, 0, MINUS_ONE, FALSE),
205 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */
206 HOWTO(R_390_TLS_LDO64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
207 bfd_elf_generic_reloc, "R_390_TLS_LDO64", FALSE, 0, MINUS_ONE, FALSE),
208 HOWTO(R_390_TLS_DTPMOD, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
209 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, MINUS_ONE, FALSE),
210 HOWTO(R_390_TLS_DTPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
211 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, MINUS_ONE, FALSE),
212 HOWTO(R_390_TLS_TPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
213 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, MINUS_ONE, FALSE),
214 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
215 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE),
216 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
217 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE),
218 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
219 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE),
220 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
221 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE),
222 };
223
224 /* GNU extension to record C++ vtable hierarchy. */
225 static reloc_howto_type elf64_s390_vtinherit_howto =
226 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
227 static reloc_howto_type elf64_s390_vtentry_howto =
228 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);
229
230 static reloc_howto_type *
231 elf_s390_reloc_type_lookup (abfd, code)
232 bfd *abfd ATTRIBUTE_UNUSED;
233 bfd_reloc_code_real_type code;
234 {
235 switch (code)
236 {
237 case BFD_RELOC_NONE:
238 return &elf_howto_table[(int) R_390_NONE];
239 case BFD_RELOC_8:
240 return &elf_howto_table[(int) R_390_8];
241 case BFD_RELOC_390_12:
242 return &elf_howto_table[(int) R_390_12];
243 case BFD_RELOC_16:
244 return &elf_howto_table[(int) R_390_16];
245 case BFD_RELOC_32:
246 return &elf_howto_table[(int) R_390_32];
247 case BFD_RELOC_CTOR:
248 return &elf_howto_table[(int) R_390_32];
249 case BFD_RELOC_32_PCREL:
250 return &elf_howto_table[(int) R_390_PC32];
251 case BFD_RELOC_390_GOT12:
252 return &elf_howto_table[(int) R_390_GOT12];
253 case BFD_RELOC_32_GOT_PCREL:
254 return &elf_howto_table[(int) R_390_GOT32];
255 case BFD_RELOC_390_PLT32:
256 return &elf_howto_table[(int) R_390_PLT32];
257 case BFD_RELOC_390_COPY:
258 return &elf_howto_table[(int) R_390_COPY];
259 case BFD_RELOC_390_GLOB_DAT:
260 return &elf_howto_table[(int) R_390_GLOB_DAT];
261 case BFD_RELOC_390_JMP_SLOT:
262 return &elf_howto_table[(int) R_390_JMP_SLOT];
263 case BFD_RELOC_390_RELATIVE:
264 return &elf_howto_table[(int) R_390_RELATIVE];
265 case BFD_RELOC_32_GOTOFF:
266 return &elf_howto_table[(int) R_390_GOTOFF32];
267 case BFD_RELOC_390_GOTPC:
268 return &elf_howto_table[(int) R_390_GOTPC];
269 case BFD_RELOC_390_GOT16:
270 return &elf_howto_table[(int) R_390_GOT16];
271 case BFD_RELOC_16_PCREL:
272 return &elf_howto_table[(int) R_390_PC16];
273 case BFD_RELOC_390_PC16DBL:
274 return &elf_howto_table[(int) R_390_PC16DBL];
275 case BFD_RELOC_390_PLT16DBL:
276 return &elf_howto_table[(int) R_390_PLT16DBL];
277 case BFD_RELOC_390_PC32DBL:
278 return &elf_howto_table[(int) R_390_PC32DBL];
279 case BFD_RELOC_390_PLT32DBL:
280 return &elf_howto_table[(int) R_390_PLT32DBL];
281 case BFD_RELOC_390_GOTPCDBL:
282 return &elf_howto_table[(int) R_390_GOTPCDBL];
283 case BFD_RELOC_64:
284 return &elf_howto_table[(int) R_390_64];
285 case BFD_RELOC_64_PCREL:
286 return &elf_howto_table[(int) R_390_PC64];
287 case BFD_RELOC_390_GOT64:
288 return &elf_howto_table[(int) R_390_GOT64];
289 case BFD_RELOC_390_PLT64:
290 return &elf_howto_table[(int) R_390_PLT64];
291 case BFD_RELOC_390_GOTENT:
292 return &elf_howto_table[(int) R_390_GOTENT];
293 case BFD_RELOC_16_GOTOFF:
294 return &elf_howto_table[(int) R_390_GOTOFF16];
295 case BFD_RELOC_390_GOTOFF64:
296 return &elf_howto_table[(int) R_390_GOTOFF64];
297 case BFD_RELOC_390_GOTPLT12:
298 return &elf_howto_table[(int) R_390_GOTPLT12];
299 case BFD_RELOC_390_GOTPLT16:
300 return &elf_howto_table[(int) R_390_GOTPLT16];
301 case BFD_RELOC_390_GOTPLT32:
302 return &elf_howto_table[(int) R_390_GOTPLT32];
303 case BFD_RELOC_390_GOTPLT64:
304 return &elf_howto_table[(int) R_390_GOTPLT64];
305 case BFD_RELOC_390_GOTPLTENT:
306 return &elf_howto_table[(int) R_390_GOTPLTENT];
307 case BFD_RELOC_390_PLTOFF16:
308 return &elf_howto_table[(int) R_390_PLTOFF16];
309 case BFD_RELOC_390_PLTOFF32:
310 return &elf_howto_table[(int) R_390_PLTOFF32];
311 case BFD_RELOC_390_PLTOFF64:
312 return &elf_howto_table[(int) R_390_PLTOFF64];
313 case BFD_RELOC_390_TLS_LOAD:
314 return &elf_howto_table[(int) R_390_TLS_LOAD];
315 case BFD_RELOC_390_TLS_GDCALL:
316 return &elf_howto_table[(int) R_390_TLS_GDCALL];
317 case BFD_RELOC_390_TLS_LDCALL:
318 return &elf_howto_table[(int) R_390_TLS_LDCALL];
319 case BFD_RELOC_390_TLS_GD64:
320 return &elf_howto_table[(int) R_390_TLS_GD64];
321 case BFD_RELOC_390_TLS_GOTIE12:
322 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
323 case BFD_RELOC_390_TLS_GOTIE64:
324 return &elf_howto_table[(int) R_390_TLS_GOTIE64];
325 case BFD_RELOC_390_TLS_LDM64:
326 return &elf_howto_table[(int) R_390_TLS_LDM64];
327 case BFD_RELOC_390_TLS_IE64:
328 return &elf_howto_table[(int) R_390_TLS_IE64];
329 case BFD_RELOC_390_TLS_IEENT:
330 return &elf_howto_table[(int) R_390_TLS_IEENT];
331 case BFD_RELOC_390_TLS_LE64:
332 return &elf_howto_table[(int) R_390_TLS_LE64];
333 case BFD_RELOC_390_TLS_LDO64:
334 return &elf_howto_table[(int) R_390_TLS_LDO64];
335 case BFD_RELOC_390_TLS_DTPMOD:
336 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
337 case BFD_RELOC_390_TLS_DTPOFF:
338 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
339 case BFD_RELOC_390_TLS_TPOFF:
340 return &elf_howto_table[(int) R_390_TLS_TPOFF];
341 case BFD_RELOC_390_20:
342 return &elf_howto_table[(int) R_390_20];
343 case BFD_RELOC_390_GOT20:
344 return &elf_howto_table[(int) R_390_GOT20];
345 case BFD_RELOC_390_GOTPLT20:
346 return &elf_howto_table[(int) R_390_GOTPLT20];
347 case BFD_RELOC_390_TLS_GOTIE20:
348 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
349 case BFD_RELOC_VTABLE_INHERIT:
350 return &elf64_s390_vtinherit_howto;
351 case BFD_RELOC_VTABLE_ENTRY:
352 return &elf64_s390_vtentry_howto;
353 default:
354 break;
355 }
356 return 0;
357 }
358
359 static reloc_howto_type *
360 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
361 const char *r_name)
362 {
363 unsigned int i;
364
365 for (i = 0;
366 i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]);
367 i++)
368 if (elf_howto_table[i].name != NULL
369 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
370 return &elf_howto_table[i];
371
372 if (strcasecmp (elf64_s390_vtinherit_howto.name, r_name) == 0)
373 return &elf64_s390_vtinherit_howto;
374 if (strcasecmp (elf64_s390_vtentry_howto.name, r_name) == 0)
375 return &elf64_s390_vtentry_howto;
376
377 return NULL;
378 }
379
380 /* We need to use ELF64_R_TYPE so we have our own copy of this function,
381 and elf64-s390.c has its own copy. */
382
383 static void
384 elf_s390_info_to_howto (abfd, cache_ptr, dst)
385 bfd *abfd ATTRIBUTE_UNUSED;
386 arelent *cache_ptr;
387 Elf_Internal_Rela *dst;
388 {
389 unsigned int r_type = ELF64_R_TYPE(dst->r_info);
390 switch (r_type)
391 {
392 case R_390_GNU_VTINHERIT:
393 cache_ptr->howto = &elf64_s390_vtinherit_howto;
394 break;
395
396 case R_390_GNU_VTENTRY:
397 cache_ptr->howto = &elf64_s390_vtentry_howto;
398 break;
399
400 default:
401 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
402 {
403 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
404 abfd, (int) r_type);
405 r_type = R_390_NONE;
406 }
407 cache_ptr->howto = &elf_howto_table[r_type];
408 }
409 }
410
411 /* A relocation function which doesn't do anything. */
412 static bfd_reloc_status_type
413 s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section,
414 output_bfd, error_message)
415 bfd *abfd ATTRIBUTE_UNUSED;
416 arelent *reloc_entry;
417 asymbol *symbol ATTRIBUTE_UNUSED;
418 PTR data ATTRIBUTE_UNUSED;
419 asection *input_section;
420 bfd *output_bfd;
421 char **error_message ATTRIBUTE_UNUSED;
422 {
423 if (output_bfd)
424 reloc_entry->address += input_section->output_offset;
425 return bfd_reloc_ok;
426 }
427
428 /* Handle the large displacement relocs. */
429 static bfd_reloc_status_type
430 s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section,
431 output_bfd, error_message)
432 bfd *abfd;
433 arelent *reloc_entry;
434 asymbol *symbol;
435 PTR data;
436 asection *input_section;
437 bfd *output_bfd;
438 char **error_message ATTRIBUTE_UNUSED;
439 {
440 reloc_howto_type *howto = reloc_entry->howto;
441 bfd_vma relocation;
442 bfd_vma insn;
443
444 if (output_bfd != (bfd *) NULL
445 && (symbol->flags & BSF_SECTION_SYM) == 0
446 && (! howto->partial_inplace
447 || reloc_entry->addend == 0))
448 {
449 reloc_entry->address += input_section->output_offset;
450 return bfd_reloc_ok;
451 }
452 if (output_bfd != NULL)
453 return bfd_reloc_continue;
454
455 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
456 return bfd_reloc_outofrange;
457
458 relocation = (symbol->value
459 + symbol->section->output_section->vma
460 + symbol->section->output_offset);
461 relocation += reloc_entry->addend;
462 if (howto->pc_relative)
463 {
464 relocation -= (input_section->output_section->vma
465 + input_section->output_offset);
466 relocation -= reloc_entry->address;
467 }
468
469 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
470 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
471 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
472
473 if ((bfd_signed_vma) relocation < - 0x80000
474 || (bfd_signed_vma) relocation > 0x7ffff)
475 return bfd_reloc_overflow;
476 else
477 return bfd_reloc_ok;
478 }
479
480 static bfd_boolean
481 elf_s390_is_local_label_name (abfd, name)
482 bfd *abfd;
483 const char *name;
484 {
485 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
486 return TRUE;
487
488 return _bfd_elf_is_local_label_name (abfd, name);
489 }
490
491 /* Functions for the 390 ELF linker. */
492
493 /* The name of the dynamic interpreter. This is put in the .interp
494 section. */
495
496 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
497
498 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
499 copying dynamic variables from a shared lib into an app's dynbss
500 section, and instead use a dynamic relocation to point into the
501 shared lib. */
502 #define ELIMINATE_COPY_RELOCS 1
503
504 /* The size in bytes of the first entry in the procedure linkage table. */
505 #define PLT_FIRST_ENTRY_SIZE 32
506 /* The size in bytes of an entry in the procedure linkage table. */
507 #define PLT_ENTRY_SIZE 32
508
509 #define GOT_ENTRY_SIZE 8
510
511 /* The first three entries in a procedure linkage table are reserved,
512 and the initial contents are unimportant (we zero them out).
513 Subsequent entries look like this. See the SVR4 ABI 386
514 supplement to see how this works. */
515
516 /* For the s390, simple addr offset can only be 0 - 4096.
517 To use the full 16777216 TB address space, several instructions
518 are needed to load an address in a register and execute
519 a branch( or just saving the address)
520
521 Furthermore, only r 0 and 1 are free to use!!! */
522
523 /* The first 3 words in the GOT are then reserved.
524 Word 0 is the address of the dynamic table.
525 Word 1 is a pointer to a structure describing the object
526 Word 2 is used to point to the loader entry address.
527
528 The code for PLT entries looks like this:
529
530 The GOT holds the address in the PLT to be executed.
531 The loader then gets:
532 24(15) = Pointer to the structure describing the object.
533 28(15) = Offset in symbol table
534 The loader must then find the module where the function is
535 and insert the address in the GOT.
536
537 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
538 LG 1,0(1) # 6 bytes Load address from GOT in r1
539 BCR 15,1 # 2 bytes Jump to address
540 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
541 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1
542 BRCL 15,-x # 6 bytes Jump to start of PLT
543 .long ? # 4 bytes offset into symbol table
544
545 Total = 32 bytes per PLT entry
546 Fixup at offset 2: relative address to GOT entry
547 Fixup at offset 22: relative branch to PLT0
548 Fixup at offset 28: 32 bit offset into symbol table
549
550 A 32 bit offset into the symbol table is enough. It allows for symbol
551 tables up to a size of 2 gigabyte. A single dynamic object (the main
552 program, any shared library) is limited to 4GB in size and I want to see
553 the program that manages to have a symbol table of more than 2 GB with a
554 total size of at max 4 GB. */
555
556 #define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000
557 #define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310
558 #define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004
559 #define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10
560 #define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c
561 #define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4
562 #define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000
563 #define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000
564
565 /* The first PLT entry pushes the offset into the symbol table
566 from R1 onto the stack at 8(15) and the loader object info
567 at 12(15), loads the loader address in R1 and jumps to it. */
568
569 /* The first entry in the PLT:
570
571 PLT0:
572 STG 1,56(15) # r1 contains the offset into the symbol table
573 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
574 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
575 LG 1,16(1) # get entry address of loader
576 BCR 15,1 # jump to loader
577
578 Fixup at offset 8: relative address to start of GOT. */
579
580 #define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038
581 #define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010
582 #define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000
583 #define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030
584 #define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310
585 #define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004
586 #define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700
587 #define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700
588
589 /* The s390 linker needs to keep track of the number of relocs that it
590 decides to copy as dynamic relocs in check_relocs for each symbol.
591 This is so that it can later discard them if they are found to be
592 unnecessary. We store the information in a field extending the
593 regular ELF linker hash table. */
594
595 struct elf_s390_dyn_relocs
596 {
597 struct elf_s390_dyn_relocs *next;
598
599 /* The input section of the reloc. */
600 asection *sec;
601
602 /* Total number of relocs copied for the input section. */
603 bfd_size_type count;
604
605 /* Number of pc-relative relocs copied for the input section. */
606 bfd_size_type pc_count;
607 };
608
609 /* s390 ELF linker hash entry. */
610
611 struct elf_s390_link_hash_entry
612 {
613 struct elf_link_hash_entry elf;
614
615 /* Track dynamic relocs copied for this symbol. */
616 struct elf_s390_dyn_relocs *dyn_relocs;
617
618 /* Number of GOTPLT references for a function. */
619 bfd_signed_vma gotplt_refcount;
620
621 #define GOT_UNKNOWN 0
622 #define GOT_NORMAL 1
623 #define GOT_TLS_GD 2
624 #define GOT_TLS_IE 3
625 #define GOT_TLS_IE_NLT 3
626 unsigned char tls_type;
627 };
628
629 #define elf_s390_hash_entry(ent) \
630 ((struct elf_s390_link_hash_entry *)(ent))
631
632 struct elf_s390_obj_tdata
633 {
634 struct elf_obj_tdata root;
635
636 /* tls_type for each local got entry. */
637 char *local_got_tls_type;
638 };
639
640 #define elf_s390_tdata(abfd) \
641 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
642
643 #define elf_s390_local_got_tls_type(abfd) \
644 (elf_s390_tdata (abfd)->local_got_tls_type)
645
646 static bfd_boolean
647 elf_s390_mkobject (bfd *abfd)
648 {
649 if (abfd->tdata.any == NULL)
650 {
651 bfd_size_type amt = sizeof (struct elf_s390_obj_tdata);
652 abfd->tdata.any = bfd_zalloc (abfd, amt);
653 if (abfd->tdata.any == NULL)
654 return FALSE;
655 }
656 return bfd_elf_mkobject (abfd);
657 }
658
659 static bfd_boolean
660 elf_s390_object_p (abfd)
661 bfd *abfd;
662 {
663 /* Set the right machine number for an s390 elf32 file. */
664 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
665 }
666
667 /* s390 ELF linker hash table. */
668
669 struct elf_s390_link_hash_table
670 {
671 struct elf_link_hash_table elf;
672
673 /* Short-cuts to get to dynamic linker sections. */
674 asection *sgot;
675 asection *sgotplt;
676 asection *srelgot;
677 asection *splt;
678 asection *srelplt;
679 asection *sdynbss;
680 asection *srelbss;
681
682 union {
683 bfd_signed_vma refcount;
684 bfd_vma offset;
685 } tls_ldm_got;
686
687 /* Small local sym to section mapping cache. */
688 struct sym_sec_cache sym_sec;
689 };
690
691 /* Get the s390 ELF linker hash table from a link_info structure. */
692
693 #define elf_s390_hash_table(p) \
694 ((struct elf_s390_link_hash_table *) ((p)->hash))
695
696 /* Create an entry in an s390 ELF linker hash table. */
697
698 static struct bfd_hash_entry *
699 link_hash_newfunc (entry, table, string)
700 struct bfd_hash_entry *entry;
701 struct bfd_hash_table *table;
702 const char *string;
703 {
704 /* Allocate the structure if it has not already been allocated by a
705 subclass. */
706 if (entry == NULL)
707 {
708 entry = bfd_hash_allocate (table,
709 sizeof (struct elf_s390_link_hash_entry));
710 if (entry == NULL)
711 return entry;
712 }
713
714 /* Call the allocation method of the superclass. */
715 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
716 if (entry != NULL)
717 {
718 struct elf_s390_link_hash_entry *eh;
719
720 eh = (struct elf_s390_link_hash_entry *) entry;
721 eh->dyn_relocs = NULL;
722 eh->gotplt_refcount = 0;
723 eh->tls_type = GOT_UNKNOWN;
724 }
725
726 return entry;
727 }
728
729 /* Create an s390 ELF linker hash table. */
730
731 static struct bfd_link_hash_table *
732 elf_s390_link_hash_table_create (abfd)
733 bfd *abfd;
734 {
735 struct elf_s390_link_hash_table *ret;
736 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
737
738 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
739 if (ret == NULL)
740 return NULL;
741
742 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
743 sizeof (struct elf_s390_link_hash_entry)))
744 {
745 free (ret);
746 return NULL;
747 }
748
749 ret->sgot = NULL;
750 ret->sgotplt = NULL;
751 ret->srelgot = NULL;
752 ret->splt = NULL;
753 ret->srelplt = NULL;
754 ret->sdynbss = NULL;
755 ret->srelbss = NULL;
756 ret->tls_ldm_got.refcount = 0;
757 ret->sym_sec.abfd = NULL;
758
759 return &ret->elf.root;
760 }
761
762 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
763 shortcuts to them in our hash table. */
764
765 static bfd_boolean
766 create_got_section (dynobj, info)
767 bfd *dynobj;
768 struct bfd_link_info *info;
769 {
770 struct elf_s390_link_hash_table *htab;
771
772 if (! _bfd_elf_create_got_section (dynobj, info))
773 return FALSE;
774
775 htab = elf_s390_hash_table (info);
776 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
777 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
778 if (!htab->sgot || !htab->sgotplt)
779 abort ();
780
781 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got",
782 (SEC_ALLOC | SEC_LOAD
783 | SEC_HAS_CONTENTS
784 | SEC_IN_MEMORY
785 | SEC_LINKER_CREATED
786 | SEC_READONLY));
787 if (htab->srelgot == NULL
788 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3))
789 return FALSE;
790 return TRUE;
791 }
792
793 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
794 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
795 hash table. */
796
797 static bfd_boolean
798 elf_s390_create_dynamic_sections (dynobj, info)
799 bfd *dynobj;
800 struct bfd_link_info *info;
801 {
802 struct elf_s390_link_hash_table *htab;
803
804 htab = elf_s390_hash_table (info);
805 if (!htab->sgot && !create_got_section (dynobj, info))
806 return FALSE;
807
808 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
809 return FALSE;
810
811 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
812 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
813 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
814 if (!info->shared)
815 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
816
817 if (!htab->splt || !htab->srelplt || !htab->sdynbss
818 || (!info->shared && !htab->srelbss))
819 abort ();
820
821 return TRUE;
822 }
823
824 /* Copy the extra info we tack onto an elf_link_hash_entry. */
825
826 static void
827 elf_s390_copy_indirect_symbol (info, dir, ind)
828 struct bfd_link_info *info;
829 struct elf_link_hash_entry *dir, *ind;
830 {
831 struct elf_s390_link_hash_entry *edir, *eind;
832
833 edir = (struct elf_s390_link_hash_entry *) dir;
834 eind = (struct elf_s390_link_hash_entry *) ind;
835
836 if (eind->dyn_relocs != NULL)
837 {
838 if (edir->dyn_relocs != NULL)
839 {
840 struct elf_s390_dyn_relocs **pp;
841 struct elf_s390_dyn_relocs *p;
842
843 /* Add reloc counts against the indirect sym to the direct sym
844 list. Merge any entries against the same section. */
845 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
846 {
847 struct elf_s390_dyn_relocs *q;
848
849 for (q = edir->dyn_relocs; q != NULL; q = q->next)
850 if (q->sec == p->sec)
851 {
852 q->pc_count += p->pc_count;
853 q->count += p->count;
854 *pp = p->next;
855 break;
856 }
857 if (q == NULL)
858 pp = &p->next;
859 }
860 *pp = edir->dyn_relocs;
861 }
862
863 edir->dyn_relocs = eind->dyn_relocs;
864 eind->dyn_relocs = NULL;
865 }
866
867 if (ind->root.type == bfd_link_hash_indirect
868 && dir->got.refcount <= 0)
869 {
870 edir->tls_type = eind->tls_type;
871 eind->tls_type = GOT_UNKNOWN;
872 }
873
874 if (ELIMINATE_COPY_RELOCS
875 && ind->root.type != bfd_link_hash_indirect
876 && dir->dynamic_adjusted)
877 {
878 /* If called to transfer flags for a weakdef during processing
879 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
880 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
881 dir->ref_dynamic |= ind->ref_dynamic;
882 dir->ref_regular |= ind->ref_regular;
883 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
884 dir->needs_plt |= ind->needs_plt;
885 }
886 else
887 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
888 }
889
890 static int
891 elf_s390_tls_transition (info, r_type, is_local)
892 struct bfd_link_info *info;
893 int r_type;
894 int is_local;
895 {
896 if (info->shared)
897 return r_type;
898
899 switch (r_type)
900 {
901 case R_390_TLS_GD64:
902 case R_390_TLS_IE64:
903 if (is_local)
904 return R_390_TLS_LE64;
905 return R_390_TLS_IE64;
906 case R_390_TLS_GOTIE64:
907 if (is_local)
908 return R_390_TLS_LE64;
909 return R_390_TLS_GOTIE64;
910 case R_390_TLS_LDM64:
911 return R_390_TLS_LE64;
912 }
913
914 return r_type;
915 }
916
917 /* Look through the relocs for a section during the first phase, and
918 allocate space in the global offset table or procedure linkage
919 table. */
920
921 static bfd_boolean
922 elf_s390_check_relocs (abfd, info, sec, relocs)
923 bfd *abfd;
924 struct bfd_link_info *info;
925 asection *sec;
926 const Elf_Internal_Rela *relocs;
927 {
928 struct elf_s390_link_hash_table *htab;
929 Elf_Internal_Shdr *symtab_hdr;
930 struct elf_link_hash_entry **sym_hashes;
931 const Elf_Internal_Rela *rel;
932 const Elf_Internal_Rela *rel_end;
933 asection *sreloc;
934 bfd_signed_vma *local_got_refcounts;
935 int tls_type, old_tls_type;
936
937 if (info->relocatable)
938 return TRUE;
939
940 htab = elf_s390_hash_table (info);
941 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
942 sym_hashes = elf_sym_hashes (abfd);
943 local_got_refcounts = elf_local_got_refcounts (abfd);
944
945 sreloc = NULL;
946
947 rel_end = relocs + sec->reloc_count;
948 for (rel = relocs; rel < rel_end; rel++)
949 {
950 unsigned int r_type;
951 unsigned long r_symndx;
952 struct elf_link_hash_entry *h;
953
954 r_symndx = ELF64_R_SYM (rel->r_info);
955
956 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
957 {
958 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
959 abfd,
960 r_symndx);
961 return FALSE;
962 }
963
964 if (r_symndx < symtab_hdr->sh_info)
965 h = NULL;
966 else
967 {
968 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
969 while (h->root.type == bfd_link_hash_indirect
970 || h->root.type == bfd_link_hash_warning)
971 h = (struct elf_link_hash_entry *) h->root.u.i.link;
972 }
973
974 /* Create got section and local_got_refcounts array if they
975 are needed. */
976 r_type = elf_s390_tls_transition (info,
977 ELF64_R_TYPE (rel->r_info),
978 h == NULL);
979 switch (r_type)
980 {
981 case R_390_GOT12:
982 case R_390_GOT16:
983 case R_390_GOT20:
984 case R_390_GOT32:
985 case R_390_GOT64:
986 case R_390_GOTENT:
987 case R_390_GOTPLT12:
988 case R_390_GOTPLT16:
989 case R_390_GOTPLT20:
990 case R_390_GOTPLT32:
991 case R_390_GOTPLT64:
992 case R_390_GOTPLTENT:
993 case R_390_TLS_GD64:
994 case R_390_TLS_GOTIE12:
995 case R_390_TLS_GOTIE20:
996 case R_390_TLS_GOTIE64:
997 case R_390_TLS_IEENT:
998 case R_390_TLS_IE64:
999 case R_390_TLS_LDM64:
1000 if (h == NULL
1001 && local_got_refcounts == NULL)
1002 {
1003 bfd_size_type size;
1004
1005 size = symtab_hdr->sh_info;
1006 size *= (sizeof (bfd_signed_vma) + sizeof(char));
1007 local_got_refcounts = ((bfd_signed_vma *)
1008 bfd_zalloc (abfd, size));
1009 if (local_got_refcounts == NULL)
1010 return FALSE;
1011 elf_local_got_refcounts (abfd) = local_got_refcounts;
1012 elf_s390_local_got_tls_type (abfd)
1013 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1014 }
1015 /* Fall through. */
1016 case R_390_GOTOFF16:
1017 case R_390_GOTOFF32:
1018 case R_390_GOTOFF64:
1019 case R_390_GOTPC:
1020 case R_390_GOTPCDBL:
1021 if (htab->sgot == NULL)
1022 {
1023 if (htab->elf.dynobj == NULL)
1024 htab->elf.dynobj = abfd;
1025 if (!create_got_section (htab->elf.dynobj, info))
1026 return FALSE;
1027 }
1028 }
1029
1030 switch (r_type)
1031 {
1032 case R_390_GOTOFF16:
1033 case R_390_GOTOFF32:
1034 case R_390_GOTOFF64:
1035 case R_390_GOTPC:
1036 case R_390_GOTPCDBL:
1037 /* Got is created, nothing to be done. */
1038 break;
1039
1040 case R_390_PLT16DBL:
1041 case R_390_PLT32:
1042 case R_390_PLT32DBL:
1043 case R_390_PLT64:
1044 case R_390_PLTOFF16:
1045 case R_390_PLTOFF32:
1046 case R_390_PLTOFF64:
1047 /* This symbol requires a procedure linkage table entry. We
1048 actually build the entry in adjust_dynamic_symbol,
1049 because this might be a case of linking PIC code which is
1050 never referenced by a dynamic object, in which case we
1051 don't need to generate a procedure linkage table entry
1052 after all. */
1053
1054 /* If this is a local symbol, we resolve it directly without
1055 creating a procedure linkage table entry. */
1056 if (h != NULL)
1057 {
1058 h->needs_plt = 1;
1059 h->plt.refcount += 1;
1060 }
1061 break;
1062
1063 case R_390_GOTPLT12:
1064 case R_390_GOTPLT16:
1065 case R_390_GOTPLT20:
1066 case R_390_GOTPLT32:
1067 case R_390_GOTPLT64:
1068 case R_390_GOTPLTENT:
1069 /* This symbol requires either a procedure linkage table entry
1070 or an entry in the local got. We actually build the entry
1071 in adjust_dynamic_symbol because whether this is really a
1072 global reference can change and with it the fact if we have
1073 to create a plt entry or a local got entry. To be able to
1074 make a once global symbol a local one we have to keep track
1075 of the number of gotplt references that exist for this
1076 symbol. */
1077 if (h != NULL)
1078 {
1079 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1080 h->needs_plt = 1;
1081 h->plt.refcount += 1;
1082 }
1083 else
1084 local_got_refcounts[r_symndx] += 1;
1085 break;
1086
1087 case R_390_TLS_LDM64:
1088 htab->tls_ldm_got.refcount += 1;
1089 break;
1090
1091 case R_390_TLS_IE64:
1092 case R_390_TLS_GOTIE12:
1093 case R_390_TLS_GOTIE20:
1094 case R_390_TLS_GOTIE64:
1095 case R_390_TLS_IEENT:
1096 if (info->shared)
1097 info->flags |= DF_STATIC_TLS;
1098 /* Fall through */
1099
1100 case R_390_GOT12:
1101 case R_390_GOT16:
1102 case R_390_GOT20:
1103 case R_390_GOT32:
1104 case R_390_GOT64:
1105 case R_390_GOTENT:
1106 case R_390_TLS_GD64:
1107 /* This symbol requires a global offset table entry. */
1108 switch (r_type)
1109 {
1110 default:
1111 case R_390_GOT12:
1112 case R_390_GOT16:
1113 case R_390_GOT20:
1114 case R_390_GOT32:
1115 case R_390_GOTENT:
1116 tls_type = GOT_NORMAL;
1117 break;
1118 case R_390_TLS_GD64:
1119 tls_type = GOT_TLS_GD;
1120 break;
1121 case R_390_TLS_IE64:
1122 case R_390_TLS_GOTIE64:
1123 tls_type = GOT_TLS_IE;
1124 break;
1125 case R_390_TLS_GOTIE12:
1126 case R_390_TLS_GOTIE20:
1127 case R_390_TLS_IEENT:
1128 tls_type = GOT_TLS_IE_NLT;
1129 break;
1130 }
1131
1132 if (h != NULL)
1133 {
1134 h->got.refcount += 1;
1135 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1136 }
1137 else
1138 {
1139 local_got_refcounts[r_symndx] += 1;
1140 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1141 }
1142 /* If a TLS symbol is accessed using IE at least once,
1143 there is no point to use dynamic model for it. */
1144 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1145 {
1146 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1147 {
1148 (*_bfd_error_handler)
1149 (_("%B: `%s' accessed both as normal and thread local symbol"),
1150 abfd, h->root.root.string);
1151 return FALSE;
1152 }
1153 if (old_tls_type > tls_type)
1154 tls_type = old_tls_type;
1155 }
1156
1157 if (old_tls_type != tls_type)
1158 {
1159 if (h != NULL)
1160 elf_s390_hash_entry (h)->tls_type = tls_type;
1161 else
1162 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1163 }
1164
1165 if (r_type != R_390_TLS_IE64)
1166 break;
1167 /* Fall through */
1168
1169 case R_390_TLS_LE64:
1170 if (!info->shared)
1171 break;
1172 info->flags |= DF_STATIC_TLS;
1173 /* Fall through */
1174
1175 case R_390_8:
1176 case R_390_16:
1177 case R_390_32:
1178 case R_390_64:
1179 case R_390_PC16:
1180 case R_390_PC16DBL:
1181 case R_390_PC32:
1182 case R_390_PC32DBL:
1183 case R_390_PC64:
1184 if (h != NULL && !info->shared)
1185 {
1186 /* If this reloc is in a read-only section, we might
1187 need a copy reloc. We can't check reliably at this
1188 stage whether the section is read-only, as input
1189 sections have not yet been mapped to output sections.
1190 Tentatively set the flag for now, and correct in
1191 adjust_dynamic_symbol. */
1192 h->non_got_ref = 1;
1193
1194 /* We may need a .plt entry if the function this reloc
1195 refers to is in a shared lib. */
1196 h->plt.refcount += 1;
1197 }
1198
1199 /* If we are creating a shared library, and this is a reloc
1200 against a global symbol, or a non PC relative reloc
1201 against a local symbol, then we need to copy the reloc
1202 into the shared library. However, if we are linking with
1203 -Bsymbolic, we do not need to copy a reloc against a
1204 global symbol which is defined in an object we are
1205 including in the link (i.e., DEF_REGULAR is set). At
1206 this point we have not seen all the input files, so it is
1207 possible that DEF_REGULAR is not set now but will be set
1208 later (it is never cleared). In case of a weak definition,
1209 DEF_REGULAR may be cleared later by a strong definition in
1210 a shared library. We account for that possibility below by
1211 storing information in the relocs_copied field of the hash
1212 table entry. A similar situation occurs when creating
1213 shared libraries and symbol visibility changes render the
1214 symbol local.
1215
1216 If on the other hand, we are creating an executable, we
1217 may need to keep relocations for symbols satisfied by a
1218 dynamic library if we manage to avoid copy relocs for the
1219 symbol. */
1220 if ((info->shared
1221 && (sec->flags & SEC_ALLOC) != 0
1222 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
1223 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
1224 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
1225 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
1226 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
1227 || (h != NULL
1228 && (! info->symbolic
1229 || h->root.type == bfd_link_hash_defweak
1230 || !h->def_regular))))
1231 || (ELIMINATE_COPY_RELOCS
1232 && !info->shared
1233 && (sec->flags & SEC_ALLOC) != 0
1234 && h != NULL
1235 && (h->root.type == bfd_link_hash_defweak
1236 || !h->def_regular)))
1237 {
1238 struct elf_s390_dyn_relocs *p;
1239 struct elf_s390_dyn_relocs **head;
1240
1241 /* We must copy these reloc types into the output file.
1242 Create a reloc section in dynobj and make room for
1243 this reloc. */
1244 if (sreloc == NULL)
1245 {
1246 const char *name;
1247 bfd *dynobj;
1248
1249 name = (bfd_elf_string_from_elf_section
1250 (abfd,
1251 elf_elfheader (abfd)->e_shstrndx,
1252 elf_section_data (sec)->rel_hdr.sh_name));
1253 if (name == NULL)
1254 return FALSE;
1255
1256 if (! CONST_STRNEQ (name, ".rela")
1257 || strcmp (bfd_get_section_name (abfd, sec),
1258 name + 5) != 0)
1259 {
1260 (*_bfd_error_handler)
1261 (_("%B: bad relocation section name `%s\'"),
1262 abfd, name);
1263 }
1264
1265 if (htab->elf.dynobj == NULL)
1266 htab->elf.dynobj = abfd;
1267
1268 dynobj = htab->elf.dynobj;
1269 sreloc = bfd_get_section_by_name (dynobj, name);
1270 if (sreloc == NULL)
1271 {
1272 flagword flags;
1273
1274 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1275 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1276 if ((sec->flags & SEC_ALLOC) != 0)
1277 flags |= SEC_ALLOC | SEC_LOAD;
1278 sreloc = bfd_make_section_with_flags (dynobj,
1279 name,
1280 flags);
1281 if (sreloc == NULL
1282 || ! bfd_set_section_alignment (dynobj, sreloc, 3))
1283 return FALSE;
1284 }
1285 elf_section_data (sec)->sreloc = sreloc;
1286 }
1287
1288 /* If this is a global symbol, we count the number of
1289 relocations we need for this symbol. */
1290 if (h != NULL)
1291 {
1292 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1293 }
1294 else
1295 {
1296 /* Track dynamic relocs needed for local syms too.
1297 We really need local syms available to do this
1298 easily. Oh well. */
1299
1300 asection *s;
1301 void *vpp;
1302
1303 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1304 sec, r_symndx);
1305 if (s == NULL)
1306 return FALSE;
1307
1308 vpp = &elf_section_data (s)->local_dynrel;
1309 head = (struct elf_s390_dyn_relocs **) vpp;
1310 }
1311
1312 p = *head;
1313 if (p == NULL || p->sec != sec)
1314 {
1315 bfd_size_type amt = sizeof *p;
1316 p = ((struct elf_s390_dyn_relocs *)
1317 bfd_alloc (htab->elf.dynobj, amt));
1318 if (p == NULL)
1319 return FALSE;
1320 p->next = *head;
1321 *head = p;
1322 p->sec = sec;
1323 p->count = 0;
1324 p->pc_count = 0;
1325 }
1326
1327 p->count += 1;
1328 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
1329 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1330 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
1331 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
1332 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
1333 p->pc_count += 1;
1334 }
1335 break;
1336
1337 /* This relocation describes the C++ object vtable hierarchy.
1338 Reconstruct it for later use during GC. */
1339 case R_390_GNU_VTINHERIT:
1340 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1341 return FALSE;
1342 break;
1343
1344 /* This relocation describes which C++ vtable entries are actually
1345 used. Record for later use during GC. */
1346 case R_390_GNU_VTENTRY:
1347 BFD_ASSERT (h != NULL);
1348 if (h != NULL
1349 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1350 return FALSE;
1351 break;
1352
1353 default:
1354 break;
1355 }
1356 }
1357
1358 return TRUE;
1359 }
1360
1361 /* Return the section that should be marked against GC for a given
1362 relocation. */
1363
1364 static asection *
1365 elf_s390_gc_mark_hook (asection *sec,
1366 struct bfd_link_info *info,
1367 Elf_Internal_Rela *rel,
1368 struct elf_link_hash_entry *h,
1369 Elf_Internal_Sym *sym)
1370 {
1371 if (h != NULL)
1372 switch (ELF64_R_TYPE (rel->r_info))
1373 {
1374 case R_390_GNU_VTINHERIT:
1375 case R_390_GNU_VTENTRY:
1376 return NULL;
1377 }
1378
1379 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1380 }
1381
1382 /* Update the got entry reference counts for the section being removed. */
1383
1384 static bfd_boolean
1385 elf_s390_gc_sweep_hook (bfd *abfd,
1386 struct bfd_link_info *info,
1387 asection *sec,
1388 const Elf_Internal_Rela *relocs)
1389 {
1390 Elf_Internal_Shdr *symtab_hdr;
1391 struct elf_link_hash_entry **sym_hashes;
1392 bfd_signed_vma *local_got_refcounts;
1393 const Elf_Internal_Rela *rel, *relend;
1394
1395 elf_section_data (sec)->local_dynrel = NULL;
1396
1397 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1398 sym_hashes = elf_sym_hashes (abfd);
1399 local_got_refcounts = elf_local_got_refcounts (abfd);
1400
1401 relend = relocs + sec->reloc_count;
1402 for (rel = relocs; rel < relend; rel++)
1403 {
1404 unsigned long r_symndx;
1405 unsigned int r_type;
1406 struct elf_link_hash_entry *h = NULL;
1407
1408 r_symndx = ELF64_R_SYM (rel->r_info);
1409 if (r_symndx >= symtab_hdr->sh_info)
1410 {
1411 struct elf_s390_link_hash_entry *eh;
1412 struct elf_s390_dyn_relocs **pp;
1413 struct elf_s390_dyn_relocs *p;
1414
1415 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1416 while (h->root.type == bfd_link_hash_indirect
1417 || h->root.type == bfd_link_hash_warning)
1418 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1419 eh = (struct elf_s390_link_hash_entry *) h;
1420
1421 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1422 if (p->sec == sec)
1423 {
1424 /* Everything must go for SEC. */
1425 *pp = p->next;
1426 break;
1427 }
1428 }
1429
1430 r_type = ELF64_R_TYPE (rel->r_info);
1431 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1432 switch (r_type)
1433 {
1434 case R_390_TLS_LDM64:
1435 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1436 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1437 break;
1438
1439 case R_390_TLS_GD64:
1440 case R_390_TLS_IE64:
1441 case R_390_TLS_GOTIE12:
1442 case R_390_TLS_GOTIE20:
1443 case R_390_TLS_GOTIE64:
1444 case R_390_TLS_IEENT:
1445 case R_390_GOT12:
1446 case R_390_GOT16:
1447 case R_390_GOT20:
1448 case R_390_GOT32:
1449 case R_390_GOT64:
1450 case R_390_GOTOFF16:
1451 case R_390_GOTOFF32:
1452 case R_390_GOTOFF64:
1453 case R_390_GOTPC:
1454 case R_390_GOTPCDBL:
1455 case R_390_GOTENT:
1456 if (h != NULL)
1457 {
1458 if (h->got.refcount > 0)
1459 h->got.refcount -= 1;
1460 }
1461 else if (local_got_refcounts != NULL)
1462 {
1463 if (local_got_refcounts[r_symndx] > 0)
1464 local_got_refcounts[r_symndx] -= 1;
1465 }
1466 break;
1467
1468 case R_390_8:
1469 case R_390_12:
1470 case R_390_16:
1471 case R_390_20:
1472 case R_390_32:
1473 case R_390_64:
1474 case R_390_PC16:
1475 case R_390_PC16DBL:
1476 case R_390_PC32:
1477 case R_390_PC32DBL:
1478 case R_390_PC64:
1479 if (info->shared)
1480 break;
1481 /* Fall through */
1482
1483 case R_390_PLT16DBL:
1484 case R_390_PLT32:
1485 case R_390_PLT32DBL:
1486 case R_390_PLT64:
1487 case R_390_PLTOFF16:
1488 case R_390_PLTOFF32:
1489 case R_390_PLTOFF64:
1490 if (h != NULL)
1491 {
1492 if (h->plt.refcount > 0)
1493 h->plt.refcount -= 1;
1494 }
1495 break;
1496
1497 case R_390_GOTPLT12:
1498 case R_390_GOTPLT16:
1499 case R_390_GOTPLT20:
1500 case R_390_GOTPLT32:
1501 case R_390_GOTPLT64:
1502 case R_390_GOTPLTENT:
1503 if (h != NULL)
1504 {
1505 if (h->plt.refcount > 0)
1506 {
1507 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1508 h->plt.refcount -= 1;
1509 }
1510 }
1511 else if (local_got_refcounts != NULL)
1512 {
1513 if (local_got_refcounts[r_symndx] > 0)
1514 local_got_refcounts[r_symndx] -= 1;
1515 }
1516 break;
1517
1518 default:
1519 break;
1520 }
1521 }
1522
1523 return TRUE;
1524 }
1525
1526 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1527 entry but we found we will not create any. Called when we find we will
1528 not have any PLT for this symbol, by for example
1529 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1530 or elf_s390_size_dynamic_sections if no dynamic sections will be
1531 created (we're only linking static objects). */
1532
1533 static void
1534 elf_s390_adjust_gotplt (h)
1535 struct elf_s390_link_hash_entry *h;
1536 {
1537 if (h->elf.root.type == bfd_link_hash_warning)
1538 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1539
1540 if (h->gotplt_refcount <= 0)
1541 return;
1542
1543 /* We simply add the number of gotplt references to the number
1544 * of got references for this symbol. */
1545 h->elf.got.refcount += h->gotplt_refcount;
1546 h->gotplt_refcount = -1;
1547 }
1548
1549 /* Adjust a symbol defined by a dynamic object and referenced by a
1550 regular object. The current definition is in some section of the
1551 dynamic object, but we're not including those sections. We have to
1552 change the definition to something the rest of the link can
1553 understand. */
1554
1555 static bfd_boolean
1556 elf_s390_adjust_dynamic_symbol (info, h)
1557 struct bfd_link_info *info;
1558 struct elf_link_hash_entry *h;
1559 {
1560 struct elf_s390_link_hash_table *htab;
1561 asection *s;
1562
1563 /* If this is a function, put it in the procedure linkage table. We
1564 will fill in the contents of the procedure linkage table later
1565 (although we could actually do it here). */
1566 if (h->type == STT_FUNC
1567 || h->needs_plt)
1568 {
1569 if (h->plt.refcount <= 0
1570 || (! info->shared
1571 && !h->def_dynamic
1572 && !h->ref_dynamic
1573 && h->root.type != bfd_link_hash_undefweak
1574 && h->root.type != bfd_link_hash_undefined))
1575 {
1576 /* This case can occur if we saw a PLT32 reloc in an input
1577 file, but the symbol was never referred to by a dynamic
1578 object, or if all references were garbage collected. In
1579 such a case, we don't actually need to build a procedure
1580 linkage table, and we can just do a PC32 reloc instead. */
1581 h->plt.offset = (bfd_vma) -1;
1582 h->needs_plt = 0;
1583 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1584 }
1585
1586 return TRUE;
1587 }
1588 else
1589 /* It's possible that we incorrectly decided a .plt reloc was
1590 needed for an R_390_PC32 reloc to a non-function sym in
1591 check_relocs. We can't decide accurately between function and
1592 non-function syms in check-relocs; Objects loaded later in
1593 the link may change h->type. So fix it now. */
1594 h->plt.offset = (bfd_vma) -1;
1595
1596 /* If this is a weak symbol, and there is a real definition, the
1597 processor independent code will have arranged for us to see the
1598 real definition first, and we can just use the same value. */
1599 if (h->u.weakdef != NULL)
1600 {
1601 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1602 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1603 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1604 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1605 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1606 h->non_got_ref = h->u.weakdef->non_got_ref;
1607 return TRUE;
1608 }
1609
1610 /* This is a reference to a symbol defined by a dynamic object which
1611 is not a function. */
1612
1613 /* If we are creating a shared library, we must presume that the
1614 only references to the symbol are via the global offset table.
1615 For such cases we need not do anything here; the relocations will
1616 be handled correctly by relocate_section. */
1617 if (info->shared)
1618 return TRUE;
1619
1620 /* If there are no references to this symbol that do not use the
1621 GOT, we don't need to generate a copy reloc. */
1622 if (!h->non_got_ref)
1623 return TRUE;
1624
1625 /* If -z nocopyreloc was given, we won't generate them either. */
1626 if (info->nocopyreloc)
1627 {
1628 h->non_got_ref = 0;
1629 return TRUE;
1630 }
1631
1632 if (ELIMINATE_COPY_RELOCS)
1633 {
1634 struct elf_s390_link_hash_entry * eh;
1635 struct elf_s390_dyn_relocs *p;
1636
1637 eh = (struct elf_s390_link_hash_entry *) h;
1638 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1639 {
1640 s = p->sec->output_section;
1641 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1642 break;
1643 }
1644
1645 /* If we didn't find any dynamic relocs in read-only sections, then
1646 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1647 if (p == NULL)
1648 {
1649 h->non_got_ref = 0;
1650 return TRUE;
1651 }
1652 }
1653
1654 if (h->size == 0)
1655 {
1656 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1657 h->root.root.string);
1658 return TRUE;
1659 }
1660
1661 /* We must allocate the symbol in our .dynbss section, which will
1662 become part of the .bss section of the executable. There will be
1663 an entry for this symbol in the .dynsym section. The dynamic
1664 object will contain position independent code, so all references
1665 from the dynamic object to this symbol will go through the global
1666 offset table. The dynamic linker will use the .dynsym entry to
1667 determine the address it must put in the global offset table, so
1668 both the dynamic object and the regular object will refer to the
1669 same memory location for the variable. */
1670
1671 htab = elf_s390_hash_table (info);
1672
1673 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1674 copy the initial value out of the dynamic object and into the
1675 runtime process image. */
1676 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1677 {
1678 htab->srelbss->size += sizeof (Elf64_External_Rela);
1679 h->needs_copy = 1;
1680 }
1681
1682 s = htab->sdynbss;
1683
1684 return _bfd_elf_adjust_dynamic_copy (h, s);
1685 }
1686
1687 /* Allocate space in .plt, .got and associated reloc sections for
1688 dynamic relocs. */
1689
1690 static bfd_boolean
1691 allocate_dynrelocs (h, inf)
1692 struct elf_link_hash_entry *h;
1693 PTR inf;
1694 {
1695 struct bfd_link_info *info;
1696 struct elf_s390_link_hash_table *htab;
1697 struct elf_s390_link_hash_entry *eh;
1698 struct elf_s390_dyn_relocs *p;
1699
1700 if (h->root.type == bfd_link_hash_indirect)
1701 return TRUE;
1702
1703 if (h->root.type == bfd_link_hash_warning)
1704 /* When warning symbols are created, they **replace** the "real"
1705 entry in the hash table, thus we never get to see the real
1706 symbol in a hash traversal. So look at it now. */
1707 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1708
1709 info = (struct bfd_link_info *) inf;
1710 htab = elf_s390_hash_table (info);
1711
1712 if (htab->elf.dynamic_sections_created
1713 && h->plt.refcount > 0
1714 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1715 || h->root.type != bfd_link_hash_undefweak))
1716 {
1717 /* Make sure this symbol is output as a dynamic symbol.
1718 Undefined weak syms won't yet be marked as dynamic. */
1719 if (h->dynindx == -1
1720 && !h->forced_local)
1721 {
1722 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1723 return FALSE;
1724 }
1725
1726 if (info->shared
1727 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1728 {
1729 asection *s = htab->splt;
1730
1731 /* If this is the first .plt entry, make room for the special
1732 first entry. */
1733 if (s->size == 0)
1734 s->size += PLT_FIRST_ENTRY_SIZE;
1735
1736 h->plt.offset = s->size;
1737
1738 /* If this symbol is not defined in a regular file, and we are
1739 not generating a shared library, then set the symbol to this
1740 location in the .plt. This is required to make function
1741 pointers compare as equal between the normal executable and
1742 the shared library. */
1743 if (! info->shared
1744 && !h->def_regular)
1745 {
1746 h->root.u.def.section = s;
1747 h->root.u.def.value = h->plt.offset;
1748 }
1749
1750 /* Make room for this entry. */
1751 s->size += PLT_ENTRY_SIZE;
1752
1753 /* We also need to make an entry in the .got.plt section, which
1754 will be placed in the .got section by the linker script. */
1755 htab->sgotplt->size += GOT_ENTRY_SIZE;
1756
1757 /* We also need to make an entry in the .rela.plt section. */
1758 htab->srelplt->size += sizeof (Elf64_External_Rela);
1759 }
1760 else
1761 {
1762 h->plt.offset = (bfd_vma) -1;
1763 h->needs_plt = 0;
1764 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1765 }
1766 }
1767 else
1768 {
1769 h->plt.offset = (bfd_vma) -1;
1770 h->needs_plt = 0;
1771 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1772 }
1773
1774 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to
1775 the binary, we can optimize a bit. IE64 and GOTIE64 get converted
1776 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT
1777 we can save the dynamic TLS relocation. */
1778 if (h->got.refcount > 0
1779 && !info->shared
1780 && h->dynindx == -1
1781 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1782 {
1783 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1784 /* For the GOTIE access without a literal pool entry the offset has
1785 to be stored somewhere. The immediate value in the instruction
1786 is not bit enough so the value is stored in the got. */
1787 {
1788 h->got.offset = htab->sgot->size;
1789 htab->sgot->size += GOT_ENTRY_SIZE;
1790 }
1791 else
1792 h->got.offset = (bfd_vma) -1;
1793 }
1794 else if (h->got.refcount > 0)
1795 {
1796 asection *s;
1797 bfd_boolean dyn;
1798 int tls_type = elf_s390_hash_entry(h)->tls_type;
1799
1800 /* Make sure this symbol is output as a dynamic symbol.
1801 Undefined weak syms won't yet be marked as dynamic. */
1802 if (h->dynindx == -1
1803 && !h->forced_local)
1804 {
1805 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1806 return FALSE;
1807 }
1808
1809 s = htab->sgot;
1810 h->got.offset = s->size;
1811 s->size += GOT_ENTRY_SIZE;
1812 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */
1813 if (tls_type == GOT_TLS_GD)
1814 s->size += GOT_ENTRY_SIZE;
1815 dyn = htab->elf.dynamic_sections_created;
1816 /* R_390_TLS_IE64 needs one dynamic relocation,
1817 R_390_TLS_GD64 needs one if local symbol and two if global. */
1818 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1819 || tls_type >= GOT_TLS_IE)
1820 htab->srelgot->size += sizeof (Elf64_External_Rela);
1821 else if (tls_type == GOT_TLS_GD)
1822 htab->srelgot->size += 2 * sizeof (Elf64_External_Rela);
1823 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1824 || h->root.type != bfd_link_hash_undefweak)
1825 && (info->shared
1826 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1827 htab->srelgot->size += sizeof (Elf64_External_Rela);
1828 }
1829 else
1830 h->got.offset = (bfd_vma) -1;
1831
1832 eh = (struct elf_s390_link_hash_entry *) h;
1833 if (eh->dyn_relocs == NULL)
1834 return TRUE;
1835
1836 /* In the shared -Bsymbolic case, discard space allocated for
1837 dynamic pc-relative relocs against symbols which turn out to be
1838 defined in regular objects. For the normal shared case, discard
1839 space for pc-relative relocs that have become local due to symbol
1840 visibility changes. */
1841
1842 if (info->shared)
1843 {
1844 if (SYMBOL_REFERENCES_LOCAL (info, h))
1845 {
1846 struct elf_s390_dyn_relocs **pp;
1847
1848 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1849 {
1850 p->count -= p->pc_count;
1851 p->pc_count = 0;
1852 if (p->count == 0)
1853 *pp = p->next;
1854 else
1855 pp = &p->next;
1856 }
1857 }
1858
1859 /* Also discard relocs on undefined weak syms with non-default
1860 visibility. */
1861 if (eh->dyn_relocs != NULL
1862 && h->root.type == bfd_link_hash_undefweak)
1863 {
1864 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1865 eh->dyn_relocs = NULL;
1866
1867 /* Make sure undefined weak symbols are output as a dynamic
1868 symbol in PIEs. */
1869 else if (h->dynindx == -1
1870 && !h->forced_local)
1871 {
1872 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1873 return FALSE;
1874 }
1875 }
1876 }
1877 else if (ELIMINATE_COPY_RELOCS)
1878 {
1879 /* For the non-shared case, discard space for relocs against
1880 symbols which turn out to need copy relocs or are not
1881 dynamic. */
1882
1883 if (!h->non_got_ref
1884 && ((h->def_dynamic
1885 && !h->def_regular)
1886 || (htab->elf.dynamic_sections_created
1887 && (h->root.type == bfd_link_hash_undefweak
1888 || h->root.type == bfd_link_hash_undefined))))
1889 {
1890 /* Make sure this symbol is output as a dynamic symbol.
1891 Undefined weak syms won't yet be marked as dynamic. */
1892 if (h->dynindx == -1
1893 && !h->forced_local)
1894 {
1895 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1896 return FALSE;
1897 }
1898
1899 /* If that succeeded, we know we'll be keeping all the
1900 relocs. */
1901 if (h->dynindx != -1)
1902 goto keep;
1903 }
1904
1905 eh->dyn_relocs = NULL;
1906
1907 keep: ;
1908 }
1909
1910 /* Finally, allocate space. */
1911 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1912 {
1913 asection *sreloc = elf_section_data (p->sec)->sreloc;
1914 sreloc->size += p->count * sizeof (Elf64_External_Rela);
1915 }
1916
1917 return TRUE;
1918 }
1919
1920 /* Find any dynamic relocs that apply to read-only sections. */
1921
1922 static bfd_boolean
1923 readonly_dynrelocs (h, inf)
1924 struct elf_link_hash_entry *h;
1925 PTR inf;
1926 {
1927 struct elf_s390_link_hash_entry *eh;
1928 struct elf_s390_dyn_relocs *p;
1929
1930 if (h->root.type == bfd_link_hash_warning)
1931 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1932
1933 eh = (struct elf_s390_link_hash_entry *) h;
1934 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1935 {
1936 asection *s = p->sec->output_section;
1937
1938 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1939 {
1940 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1941
1942 info->flags |= DF_TEXTREL;
1943
1944 /* Not an error, just cut short the traversal. */
1945 return FALSE;
1946 }
1947 }
1948 return TRUE;
1949 }
1950
1951 /* Set the sizes of the dynamic sections. */
1952
1953 static bfd_boolean
1954 elf_s390_size_dynamic_sections (output_bfd, info)
1955 bfd *output_bfd ATTRIBUTE_UNUSED;
1956 struct bfd_link_info *info;
1957 {
1958 struct elf_s390_link_hash_table *htab;
1959 bfd *dynobj;
1960 asection *s;
1961 bfd_boolean relocs;
1962 bfd *ibfd;
1963
1964 htab = elf_s390_hash_table (info);
1965 dynobj = htab->elf.dynobj;
1966 if (dynobj == NULL)
1967 abort ();
1968
1969 if (htab->elf.dynamic_sections_created)
1970 {
1971 /* Set the contents of the .interp section to the interpreter. */
1972 if (info->executable)
1973 {
1974 s = bfd_get_section_by_name (dynobj, ".interp");
1975 if (s == NULL)
1976 abort ();
1977 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1978 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1979 }
1980 }
1981
1982 /* Set up .got offsets for local syms, and space for local dynamic
1983 relocs. */
1984 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1985 {
1986 bfd_signed_vma *local_got;
1987 bfd_signed_vma *end_local_got;
1988 char *local_tls_type;
1989 bfd_size_type locsymcount;
1990 Elf_Internal_Shdr *symtab_hdr;
1991 asection *srela;
1992
1993 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1994 continue;
1995
1996 for (s = ibfd->sections; s != NULL; s = s->next)
1997 {
1998 struct elf_s390_dyn_relocs *p;
1999
2000 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
2001 {
2002 if (!bfd_is_abs_section (p->sec)
2003 && bfd_is_abs_section (p->sec->output_section))
2004 {
2005 /* Input section has been discarded, either because
2006 it is a copy of a linkonce section or due to
2007 linker script /DISCARD/, so we'll be discarding
2008 the relocs too. */
2009 }
2010 else if (p->count != 0)
2011 {
2012 srela = elf_section_data (p->sec)->sreloc;
2013 srela->size += p->count * sizeof (Elf64_External_Rela);
2014 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2015 info->flags |= DF_TEXTREL;
2016 }
2017 }
2018 }
2019
2020 local_got = elf_local_got_refcounts (ibfd);
2021 if (!local_got)
2022 continue;
2023
2024 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2025 locsymcount = symtab_hdr->sh_info;
2026 end_local_got = local_got + locsymcount;
2027 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2028 s = htab->sgot;
2029 srela = htab->srelgot;
2030 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2031 {
2032 if (*local_got > 0)
2033 {
2034 *local_got = s->size;
2035 s->size += GOT_ENTRY_SIZE;
2036 if (*local_tls_type == GOT_TLS_GD)
2037 s->size += GOT_ENTRY_SIZE;
2038 if (info->shared)
2039 srela->size += sizeof (Elf64_External_Rela);
2040 }
2041 else
2042 *local_got = (bfd_vma) -1;
2043 }
2044 }
2045
2046 if (htab->tls_ldm_got.refcount > 0)
2047 {
2048 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64
2049 relocs. */
2050 htab->tls_ldm_got.offset = htab->sgot->size;
2051 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2052 htab->srelgot->size += sizeof (Elf64_External_Rela);
2053 }
2054 else
2055 htab->tls_ldm_got.offset = -1;
2056
2057 /* Allocate global sym .plt and .got entries, and space for global
2058 sym dynamic relocs. */
2059 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2060
2061 /* We now have determined the sizes of the various dynamic sections.
2062 Allocate memory for them. */
2063 relocs = FALSE;
2064 for (s = dynobj->sections; s != NULL; s = s->next)
2065 {
2066 if ((s->flags & SEC_LINKER_CREATED) == 0)
2067 continue;
2068
2069 if (s == htab->splt
2070 || s == htab->sgot
2071 || s == htab->sgotplt
2072 || s == htab->sdynbss)
2073 {
2074 /* Strip this section if we don't need it; see the
2075 comment below. */
2076 }
2077 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2078 {
2079 if (s->size != 0 && s != htab->srelplt)
2080 relocs = TRUE;
2081
2082 /* We use the reloc_count field as a counter if we need
2083 to copy relocs into the output file. */
2084 s->reloc_count = 0;
2085 }
2086 else
2087 {
2088 /* It's not one of our sections, so don't allocate space. */
2089 continue;
2090 }
2091
2092 if (s->size == 0)
2093 {
2094 /* If we don't need this section, strip it from the
2095 output file. This is to handle .rela.bss and
2096 .rela.plt. We must create it in
2097 create_dynamic_sections, because it must be created
2098 before the linker maps input sections to output
2099 sections. The linker does that before
2100 adjust_dynamic_symbol is called, and it is that
2101 function which decides whether anything needs to go
2102 into these sections. */
2103
2104 s->flags |= SEC_EXCLUDE;
2105 continue;
2106 }
2107
2108 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2109 continue;
2110
2111 /* Allocate memory for the section contents. We use bfd_zalloc
2112 here in case unused entries are not reclaimed before the
2113 section's contents are written out. This should not happen,
2114 but this way if it does, we get a R_390_NONE reloc instead
2115 of garbage. */
2116 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2117 if (s->contents == NULL)
2118 return FALSE;
2119 }
2120
2121 if (htab->elf.dynamic_sections_created)
2122 {
2123 /* Add some entries to the .dynamic section. We fill in the
2124 values later, in elf_s390_finish_dynamic_sections, but we
2125 must add the entries now so that we get the correct size for
2126 the .dynamic section. The DT_DEBUG entry is filled in by the
2127 dynamic linker and used by the debugger. */
2128 #define add_dynamic_entry(TAG, VAL) \
2129 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2130
2131 if (info->executable)
2132 {
2133 if (!add_dynamic_entry (DT_DEBUG, 0))
2134 return FALSE;
2135 }
2136
2137 if (htab->splt->size != 0)
2138 {
2139 if (!add_dynamic_entry (DT_PLTGOT, 0)
2140 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2141 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2142 || !add_dynamic_entry (DT_JMPREL, 0))
2143 return FALSE;
2144 }
2145
2146 if (relocs)
2147 {
2148 if (!add_dynamic_entry (DT_RELA, 0)
2149 || !add_dynamic_entry (DT_RELASZ, 0)
2150 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2151 return FALSE;
2152
2153 /* If any dynamic relocs apply to a read-only section,
2154 then we need a DT_TEXTREL entry. */
2155 if ((info->flags & DF_TEXTREL) == 0)
2156 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2157 (PTR) info);
2158
2159 if ((info->flags & DF_TEXTREL) != 0)
2160 {
2161 if (!add_dynamic_entry (DT_TEXTREL, 0))
2162 return FALSE;
2163 }
2164 }
2165 }
2166 #undef add_dynamic_entry
2167
2168 return TRUE;
2169 }
2170
2171 /* Return the base VMA address which should be subtracted from real addresses
2172 when resolving @dtpoff relocation.
2173 This is PT_TLS segment p_vaddr. */
2174
2175 static bfd_vma
2176 dtpoff_base (info)
2177 struct bfd_link_info *info;
2178 {
2179 /* If tls_sec is NULL, we should have signalled an error already. */
2180 if (elf_hash_table (info)->tls_sec == NULL)
2181 return 0;
2182 return elf_hash_table (info)->tls_sec->vma;
2183 }
2184
2185 /* Return the relocation value for @tpoff relocation
2186 if STT_TLS virtual address is ADDRESS. */
2187
2188 static bfd_vma
2189 tpoff (info, address)
2190 struct bfd_link_info *info;
2191 bfd_vma address;
2192 {
2193 struct elf_link_hash_table *htab = elf_hash_table (info);
2194
2195 /* If tls_sec is NULL, we should have signalled an error already. */
2196 if (htab->tls_sec == NULL)
2197 return 0;
2198 return htab->tls_size + htab->tls_sec->vma - address;
2199 }
2200
2201 /* Complain if TLS instruction relocation is against an invalid
2202 instruction. */
2203
2204 static void
2205 invalid_tls_insn (input_bfd, input_section, rel)
2206 bfd *input_bfd;
2207 asection *input_section;
2208 Elf_Internal_Rela *rel;
2209 {
2210 reloc_howto_type *howto;
2211
2212 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
2213 (*_bfd_error_handler)
2214 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2215 input_bfd,
2216 input_section,
2217 (long) rel->r_offset,
2218 howto->name);
2219 bfd_set_error (bfd_error_bad_value);
2220 }
2221
2222 /* Relocate a 390 ELF section. */
2223
2224 static bfd_boolean
2225 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2226 contents, relocs, local_syms, local_sections)
2227 bfd *output_bfd;
2228 struct bfd_link_info *info;
2229 bfd *input_bfd;
2230 asection *input_section;
2231 bfd_byte *contents;
2232 Elf_Internal_Rela *relocs;
2233 Elf_Internal_Sym *local_syms;
2234 asection **local_sections;
2235 {
2236 struct elf_s390_link_hash_table *htab;
2237 Elf_Internal_Shdr *symtab_hdr;
2238 struct elf_link_hash_entry **sym_hashes;
2239 bfd_vma *local_got_offsets;
2240 Elf_Internal_Rela *rel;
2241 Elf_Internal_Rela *relend;
2242
2243 htab = elf_s390_hash_table (info);
2244 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2245 sym_hashes = elf_sym_hashes (input_bfd);
2246 local_got_offsets = elf_local_got_offsets (input_bfd);
2247
2248 rel = relocs;
2249 relend = relocs + input_section->reloc_count;
2250 for (; rel < relend; rel++)
2251 {
2252 unsigned int r_type;
2253 reloc_howto_type *howto;
2254 unsigned long r_symndx;
2255 struct elf_link_hash_entry *h;
2256 Elf_Internal_Sym *sym;
2257 asection *sec;
2258 bfd_vma off;
2259 bfd_vma relocation;
2260 bfd_boolean unresolved_reloc;
2261 bfd_reloc_status_type r;
2262 int tls_type;
2263
2264 r_type = ELF64_R_TYPE (rel->r_info);
2265 if (r_type == (int) R_390_GNU_VTINHERIT
2266 || r_type == (int) R_390_GNU_VTENTRY)
2267 continue;
2268 if (r_type >= (int) R_390_max)
2269 {
2270 bfd_set_error (bfd_error_bad_value);
2271 return FALSE;
2272 }
2273
2274 howto = elf_howto_table + r_type;
2275 r_symndx = ELF64_R_SYM (rel->r_info);
2276
2277 h = NULL;
2278 sym = NULL;
2279 sec = NULL;
2280 unresolved_reloc = FALSE;
2281 if (r_symndx < symtab_hdr->sh_info)
2282 {
2283 sym = local_syms + r_symndx;
2284 sec = local_sections[r_symndx];
2285 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2286 }
2287 else
2288 {
2289 bfd_boolean warned ATTRIBUTE_UNUSED;
2290
2291 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2292 r_symndx, symtab_hdr, sym_hashes,
2293 h, sec, relocation,
2294 unresolved_reloc, warned);
2295 }
2296
2297 if (sec != NULL && elf_discarded_section (sec))
2298 {
2299 /* For relocs against symbols from removed linkonce sections,
2300 or sections discarded by a linker script, we just want the
2301 section contents zeroed. Avoid any special processing. */
2302 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2303 rel->r_info = 0;
2304 rel->r_addend = 0;
2305 continue;
2306 }
2307
2308 if (info->relocatable)
2309 continue;
2310
2311 switch (r_type)
2312 {
2313 case R_390_GOTPLT12:
2314 case R_390_GOTPLT16:
2315 case R_390_GOTPLT20:
2316 case R_390_GOTPLT32:
2317 case R_390_GOTPLT64:
2318 case R_390_GOTPLTENT:
2319 /* There are three cases for a GOTPLT relocation. 1) The
2320 relocation is against the jump slot entry of a plt that
2321 will get emitted to the output file. 2) The relocation
2322 is against the jump slot of a plt entry that has been
2323 removed. elf_s390_adjust_gotplt has created a GOT entry
2324 as replacement. 3) The relocation is against a local symbol.
2325 Cases 2) and 3) are the same as the GOT relocation code
2326 so we just have to test for case 1 and fall through for
2327 the other two. */
2328 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2329 {
2330 bfd_vma plt_index;
2331
2332 /* Calc. index no.
2333 Current offset - size first entry / entry size. */
2334 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2335 PLT_ENTRY_SIZE;
2336
2337 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2338 addr & GOT addr. */
2339 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2340 unresolved_reloc = FALSE;
2341
2342 if (r_type == R_390_GOTPLTENT)
2343 relocation += htab->sgot->output_section->vma;
2344 break;
2345 }
2346 /* Fall through. */
2347
2348 case R_390_GOT12:
2349 case R_390_GOT16:
2350 case R_390_GOT20:
2351 case R_390_GOT32:
2352 case R_390_GOT64:
2353 case R_390_GOTENT:
2354 /* Relocation is to the entry for this symbol in the global
2355 offset table. */
2356 if (htab->sgot == NULL)
2357 abort ();
2358
2359 if (h != NULL)
2360 {
2361 bfd_boolean dyn;
2362
2363 off = h->got.offset;
2364 dyn = htab->elf.dynamic_sections_created;
2365 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2366 || (info->shared
2367 && (info->symbolic
2368 || h->dynindx == -1
2369 || h->forced_local)
2370 && h->def_regular)
2371 || (ELF_ST_VISIBILITY (h->other)
2372 && h->root.type == bfd_link_hash_undefweak))
2373 {
2374 /* This is actually a static link, or it is a
2375 -Bsymbolic link and the symbol is defined
2376 locally, or the symbol was forced to be local
2377 because of a version file. We must initialize
2378 this entry in the global offset table. Since the
2379 offset must always be a multiple of 2, we use the
2380 least significant bit to record whether we have
2381 initialized it already.
2382
2383 When doing a dynamic link, we create a .rel.got
2384 relocation entry to initialize the value. This
2385 is done in the finish_dynamic_symbol routine. */
2386 if ((off & 1) != 0)
2387 off &= ~1;
2388 else
2389 {
2390 bfd_put_64 (output_bfd, relocation,
2391 htab->sgot->contents + off);
2392 h->got.offset |= 1;
2393 }
2394 }
2395 else
2396 unresolved_reloc = FALSE;
2397 }
2398 else
2399 {
2400 if (local_got_offsets == NULL)
2401 abort ();
2402
2403 off = local_got_offsets[r_symndx];
2404
2405 /* The offset must always be a multiple of 8. We use
2406 the least significant bit to record whether we have
2407 already generated the necessary reloc. */
2408 if ((off & 1) != 0)
2409 off &= ~1;
2410 else
2411 {
2412 bfd_put_64 (output_bfd, relocation,
2413 htab->sgot->contents + off);
2414
2415 if (info->shared)
2416 {
2417 asection *s;
2418 Elf_Internal_Rela outrel;
2419 bfd_byte *loc;
2420
2421 s = htab->srelgot;
2422 if (s == NULL)
2423 abort ();
2424
2425 outrel.r_offset = (htab->sgot->output_section->vma
2426 + htab->sgot->output_offset
2427 + off);
2428 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2429 outrel.r_addend = relocation;
2430 loc = s->contents;
2431 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2432 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2433 }
2434
2435 local_got_offsets[r_symndx] |= 1;
2436 }
2437 }
2438
2439 if (off >= (bfd_vma) -2)
2440 abort ();
2441
2442 relocation = htab->sgot->output_offset + off;
2443
2444 /* For @GOTENT the relocation is against the offset between
2445 the instruction and the symbols entry in the GOT and not
2446 between the start of the GOT and the symbols entry. We
2447 add the vma of the GOT to get the correct value. */
2448 if ( r_type == R_390_GOTENT
2449 || r_type == R_390_GOTPLTENT)
2450 relocation += htab->sgot->output_section->vma;
2451
2452 break;
2453
2454 case R_390_GOTOFF16:
2455 case R_390_GOTOFF32:
2456 case R_390_GOTOFF64:
2457 /* Relocation is relative to the start of the global offset
2458 table. */
2459
2460 /* Note that sgot->output_offset is not involved in this
2461 calculation. We always want the start of .got. If we
2462 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2463 permitted by the ABI, we might have to change this
2464 calculation. */
2465 relocation -= htab->sgot->output_section->vma;
2466 break;
2467
2468 case R_390_GOTPC:
2469 case R_390_GOTPCDBL:
2470 /* Use global offset table as symbol value. */
2471 relocation = htab->sgot->output_section->vma;
2472 unresolved_reloc = FALSE;
2473 break;
2474
2475 case R_390_PLT16DBL:
2476 case R_390_PLT32:
2477 case R_390_PLT32DBL:
2478 case R_390_PLT64:
2479 /* Relocation is to the entry for this symbol in the
2480 procedure linkage table. */
2481
2482 /* Resolve a PLT32 reloc against a local symbol directly,
2483 without using the procedure linkage table. */
2484 if (h == NULL)
2485 break;
2486
2487 if (h->plt.offset == (bfd_vma) -1
2488 || htab->splt == NULL)
2489 {
2490 /* We didn't make a PLT entry for this symbol. This
2491 happens when statically linking PIC code, or when
2492 using -Bsymbolic. */
2493 break;
2494 }
2495
2496 relocation = (htab->splt->output_section->vma
2497 + htab->splt->output_offset
2498 + h->plt.offset);
2499 unresolved_reloc = FALSE;
2500 break;
2501
2502 case R_390_PLTOFF16:
2503 case R_390_PLTOFF32:
2504 case R_390_PLTOFF64:
2505 /* Relocation is to the entry for this symbol in the
2506 procedure linkage table relative to the start of the GOT. */
2507
2508 /* For local symbols or if we didn't make a PLT entry for
2509 this symbol resolve the symbol directly. */
2510 if ( h == NULL
2511 || h->plt.offset == (bfd_vma) -1
2512 || htab->splt == NULL)
2513 {
2514 relocation -= htab->sgot->output_section->vma;
2515 break;
2516 }
2517
2518 relocation = (htab->splt->output_section->vma
2519 + htab->splt->output_offset
2520 + h->plt.offset
2521 - htab->sgot->output_section->vma);
2522 unresolved_reloc = FALSE;
2523 break;
2524
2525 case R_390_8:
2526 case R_390_16:
2527 case R_390_32:
2528 case R_390_64:
2529 case R_390_PC16:
2530 case R_390_PC16DBL:
2531 case R_390_PC32:
2532 case R_390_PC32DBL:
2533 case R_390_PC64:
2534 if ((input_section->flags & SEC_ALLOC) == 0)
2535 break;
2536
2537 if ((info->shared
2538 && (h == NULL
2539 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2540 || h->root.type != bfd_link_hash_undefweak)
2541 && ((r_type != R_390_PC16
2542 && r_type != R_390_PC16DBL
2543 && r_type != R_390_PC32
2544 && r_type != R_390_PC32DBL
2545 && r_type != R_390_PC64)
2546 || (h != NULL
2547 && !SYMBOL_REFERENCES_LOCAL (info, h))))
2548 || (ELIMINATE_COPY_RELOCS
2549 && !info->shared
2550 && h != NULL
2551 && h->dynindx != -1
2552 && !h->non_got_ref
2553 && ((h->def_dynamic
2554 && !h->def_regular)
2555 || h->root.type == bfd_link_hash_undefweak
2556 || h->root.type == bfd_link_hash_undefined)))
2557 {
2558 Elf_Internal_Rela outrel;
2559 bfd_boolean skip, relocate;
2560 asection *sreloc;
2561 bfd_byte *loc;
2562
2563 /* When generating a shared object, these relocations
2564 are copied into the output file to be resolved at run
2565 time. */
2566 skip = FALSE;
2567 relocate = FALSE;
2568
2569 outrel.r_offset =
2570 _bfd_elf_section_offset (output_bfd, info, input_section,
2571 rel->r_offset);
2572 if (outrel.r_offset == (bfd_vma) -1)
2573 skip = TRUE;
2574 else if (outrel.r_offset == (bfd_vma) -2)
2575 skip = TRUE, relocate = TRUE;
2576
2577 outrel.r_offset += (input_section->output_section->vma
2578 + input_section->output_offset);
2579
2580 if (skip)
2581 memset (&outrel, 0, sizeof outrel);
2582 else if (h != NULL
2583 && h->dynindx != -1
2584 && (r_type == R_390_PC16
2585 || r_type == R_390_PC16DBL
2586 || r_type == R_390_PC32
2587 || r_type == R_390_PC32DBL
2588 || r_type == R_390_PC64
2589 || !info->shared
2590 || !info->symbolic
2591 || !h->def_regular))
2592 {
2593 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2594 outrel.r_addend = rel->r_addend;
2595 }
2596 else
2597 {
2598 /* This symbol is local, or marked to become local. */
2599 outrel.r_addend = relocation + rel->r_addend;
2600 if (r_type == R_390_64)
2601 {
2602 relocate = TRUE;
2603 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2604 }
2605 else
2606 {
2607 long sindx;
2608
2609 if (bfd_is_abs_section (sec))
2610 sindx = 0;
2611 else if (sec == NULL || sec->owner == NULL)
2612 {
2613 bfd_set_error(bfd_error_bad_value);
2614 return FALSE;
2615 }
2616 else
2617 {
2618 asection *osec;
2619
2620 osec = sec->output_section;
2621 sindx = elf_section_data (osec)->dynindx;
2622
2623 if (sindx == 0)
2624 {
2625 osec = htab->elf.text_index_section;
2626 sindx = elf_section_data (osec)->dynindx;
2627 }
2628 BFD_ASSERT (sindx != 0);
2629
2630 /* We are turning this relocation into one
2631 against a section symbol, so subtract out
2632 the output section's address but not the
2633 offset of the input section in the output
2634 section. */
2635 outrel.r_addend -= osec->vma;
2636 }
2637 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2638 }
2639 }
2640
2641 sreloc = elf_section_data (input_section)->sreloc;
2642 if (sreloc == NULL)
2643 abort ();
2644
2645 loc = sreloc->contents;
2646 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2647 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2648
2649 /* If this reloc is against an external symbol, we do
2650 not want to fiddle with the addend. Otherwise, we
2651 need to include the symbol value so that it becomes
2652 an addend for the dynamic reloc. */
2653 if (! relocate)
2654 continue;
2655 }
2656
2657 break;
2658
2659 /* Relocations for tls literal pool entries. */
2660 case R_390_TLS_IE64:
2661 if (info->shared)
2662 {
2663 Elf_Internal_Rela outrel;
2664 asection *sreloc;
2665 bfd_byte *loc;
2666
2667 outrel.r_offset = rel->r_offset
2668 + input_section->output_section->vma
2669 + input_section->output_offset;
2670 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2671 sreloc = elf_section_data (input_section)->sreloc;
2672 if (sreloc == NULL)
2673 abort ();
2674 loc = sreloc->contents;
2675 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2676 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2677 }
2678 /* Fall through. */
2679
2680 case R_390_TLS_GD64:
2681 case R_390_TLS_GOTIE64:
2682 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2683 tls_type = GOT_UNKNOWN;
2684 if (h == NULL && local_got_offsets)
2685 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2686 else if (h != NULL)
2687 {
2688 tls_type = elf_s390_hash_entry(h)->tls_type;
2689 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2690 r_type = R_390_TLS_LE64;
2691 }
2692 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2693 r_type = R_390_TLS_IE64;
2694
2695 if (r_type == R_390_TLS_LE64)
2696 {
2697 /* This relocation gets optimized away by the local exec
2698 access optimization. */
2699 BFD_ASSERT (! unresolved_reloc);
2700 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2701 contents + rel->r_offset);
2702 continue;
2703 }
2704
2705 if (htab->sgot == NULL)
2706 abort ();
2707
2708 if (h != NULL)
2709 off = h->got.offset;
2710 else
2711 {
2712 if (local_got_offsets == NULL)
2713 abort ();
2714
2715 off = local_got_offsets[r_symndx];
2716 }
2717
2718 emit_tls_relocs:
2719
2720 if ((off & 1) != 0)
2721 off &= ~1;
2722 else
2723 {
2724 Elf_Internal_Rela outrel;
2725 bfd_byte *loc;
2726 int dr_type, indx;
2727
2728 if (htab->srelgot == NULL)
2729 abort ();
2730
2731 outrel.r_offset = (htab->sgot->output_section->vma
2732 + htab->sgot->output_offset + off);
2733
2734 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2735 if (r_type == R_390_TLS_GD64)
2736 dr_type = R_390_TLS_DTPMOD;
2737 else
2738 dr_type = R_390_TLS_TPOFF;
2739 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2740 outrel.r_addend = relocation - dtpoff_base (info);
2741 else
2742 outrel.r_addend = 0;
2743 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2744 loc = htab->srelgot->contents;
2745 loc += htab->srelgot->reloc_count++
2746 * sizeof (Elf64_External_Rela);
2747 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2748
2749 if (r_type == R_390_TLS_GD64)
2750 {
2751 if (indx == 0)
2752 {
2753 BFD_ASSERT (! unresolved_reloc);
2754 bfd_put_64 (output_bfd,
2755 relocation - dtpoff_base (info),
2756 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2757 }
2758 else
2759 {
2760 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
2761 outrel.r_offset += GOT_ENTRY_SIZE;
2762 outrel.r_addend = 0;
2763 htab->srelgot->reloc_count++;
2764 loc += sizeof (Elf64_External_Rela);
2765 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2766 }
2767 }
2768
2769 if (h != NULL)
2770 h->got.offset |= 1;
2771 else
2772 local_got_offsets[r_symndx] |= 1;
2773 }
2774
2775 if (off >= (bfd_vma) -2)
2776 abort ();
2777 if (r_type == ELF64_R_TYPE (rel->r_info))
2778 {
2779 relocation = htab->sgot->output_offset + off;
2780 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
2781 relocation += htab->sgot->output_section->vma;
2782 unresolved_reloc = FALSE;
2783 }
2784 else
2785 {
2786 bfd_put_64 (output_bfd, htab->sgot->output_offset + off,
2787 contents + rel->r_offset);
2788 continue;
2789 }
2790 break;
2791
2792 case R_390_TLS_GOTIE12:
2793 case R_390_TLS_GOTIE20:
2794 case R_390_TLS_IEENT:
2795 if (h == NULL)
2796 {
2797 if (local_got_offsets == NULL)
2798 abort();
2799 off = local_got_offsets[r_symndx];
2800 if (info->shared)
2801 goto emit_tls_relocs;
2802 }
2803 else
2804 {
2805 off = h->got.offset;
2806 tls_type = elf_s390_hash_entry(h)->tls_type;
2807 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2808 goto emit_tls_relocs;
2809 }
2810
2811 if (htab->sgot == NULL)
2812 abort ();
2813
2814 BFD_ASSERT (! unresolved_reloc);
2815 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2816 htab->sgot->contents + off);
2817 relocation = htab->sgot->output_offset + off;
2818 if (r_type == R_390_TLS_IEENT)
2819 relocation += htab->sgot->output_section->vma;
2820 unresolved_reloc = FALSE;
2821 break;
2822
2823 case R_390_TLS_LDM64:
2824 if (! info->shared)
2825 /* The literal pool entry this relocation refers to gets ignored
2826 by the optimized code of the local exec model. Do nothing
2827 and the value will turn out zero. */
2828 continue;
2829
2830 if (htab->sgot == NULL)
2831 abort ();
2832
2833 off = htab->tls_ldm_got.offset;
2834 if (off & 1)
2835 off &= ~1;
2836 else
2837 {
2838 Elf_Internal_Rela outrel;
2839 bfd_byte *loc;
2840
2841 if (htab->srelgot == NULL)
2842 abort ();
2843
2844 outrel.r_offset = (htab->sgot->output_section->vma
2845 + htab->sgot->output_offset + off);
2846
2847 bfd_put_64 (output_bfd, 0,
2848 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2849 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
2850 outrel.r_addend = 0;
2851 loc = htab->srelgot->contents;
2852 loc += htab->srelgot->reloc_count++
2853 * sizeof (Elf64_External_Rela);
2854 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2855 htab->tls_ldm_got.offset |= 1;
2856 }
2857 relocation = htab->sgot->output_offset + off;
2858 unresolved_reloc = FALSE;
2859 break;
2860
2861 case R_390_TLS_LE64:
2862 if (info->shared)
2863 {
2864 /* Linking a shared library with non-fpic code requires
2865 a R_390_TLS_TPOFF relocation. */
2866 Elf_Internal_Rela outrel;
2867 asection *sreloc;
2868 bfd_byte *loc;
2869 int indx;
2870
2871 outrel.r_offset = rel->r_offset
2872 + input_section->output_section->vma
2873 + input_section->output_offset;
2874 if (h != NULL && h->dynindx != -1)
2875 indx = h->dynindx;
2876 else
2877 indx = 0;
2878 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
2879 if (indx == 0)
2880 outrel.r_addend = relocation - dtpoff_base (info);
2881 else
2882 outrel.r_addend = 0;
2883 sreloc = elf_section_data (input_section)->sreloc;
2884 if (sreloc == NULL)
2885 abort ();
2886 loc = sreloc->contents;
2887 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2888 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2889 }
2890 else
2891 {
2892 BFD_ASSERT (! unresolved_reloc);
2893 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2894 contents + rel->r_offset);
2895 }
2896 continue;
2897
2898 case R_390_TLS_LDO64:
2899 if (info->shared)
2900 relocation -= dtpoff_base (info);
2901 else
2902 /* When converting LDO to LE, we must negate. */
2903 relocation = -tpoff (info, relocation);
2904 break;
2905
2906 /* Relocations for tls instructions. */
2907 case R_390_TLS_LOAD:
2908 case R_390_TLS_GDCALL:
2909 case R_390_TLS_LDCALL:
2910 tls_type = GOT_UNKNOWN;
2911 if (h == NULL && local_got_offsets)
2912 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2913 else if (h != NULL)
2914 tls_type = elf_s390_hash_entry(h)->tls_type;
2915
2916 if (tls_type == GOT_TLS_GD)
2917 continue;
2918
2919 if (r_type == R_390_TLS_LOAD)
2920 {
2921 if (!info->shared && (h == NULL || h->dynindx == -1))
2922 {
2923 /* IE->LE transition. Four valid cases:
2924 lg %rx,(0,%ry) -> sllg %rx,%ry,0
2925 lg %rx,(%ry,0) -> sllg %rx,%ry,0
2926 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
2927 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
2928 unsigned int insn0, insn1, ry;
2929
2930 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2931 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2932 if (insn1 != 0x0004)
2933 invalid_tls_insn (input_bfd, input_section, rel);
2934 ry = 0;
2935 if ((insn0 & 0xff00f000) == 0xe3000000)
2936 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
2937 ry = (insn0 & 0x000f0000);
2938 else if ((insn0 & 0xff0f0000) == 0xe3000000)
2939 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
2940 ry = (insn0 & 0x0000f000) << 4;
2941 else if ((insn0 & 0xff00f000) == 0xe300c000)
2942 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
2943 ry = (insn0 & 0x000f0000);
2944 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
2945 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
2946 ry = (insn0 & 0x0000f000) << 4;
2947 else
2948 invalid_tls_insn (input_bfd, input_section, rel);
2949 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
2950 insn1 = 0x000d;
2951 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2952 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2953 }
2954 }
2955 else if (r_type == R_390_TLS_GDCALL)
2956 {
2957 unsigned int insn0, insn1;
2958
2959 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2960 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2961 if ((insn0 & 0xffff0000) != 0xc0e50000)
2962 invalid_tls_insn (input_bfd, input_section, rel);
2963 if (!info->shared && (h == NULL || h->dynindx == -1))
2964 {
2965 /* GD->LE transition.
2966 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2967 insn0 = 0xc0040000;
2968 insn1 = 0x0000;
2969 }
2970 else
2971 {
2972 /* GD->IE transition.
2973 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
2974 insn0 = 0xe322c000;
2975 insn1 = 0x0004;
2976 }
2977 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2978 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2979 }
2980 else if (r_type == R_390_TLS_LDCALL)
2981 {
2982 if (!info->shared)
2983 {
2984 unsigned int insn0, insn1;
2985
2986 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2987 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2988 if ((insn0 & 0xffff0000) != 0xc0e50000)
2989 invalid_tls_insn (input_bfd, input_section, rel);
2990 /* LD->LE transition.
2991 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2992 insn0 = 0xc0040000;
2993 insn1 = 0x0000;
2994 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2995 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2996 }
2997 }
2998 continue;
2999
3000 default:
3001 break;
3002 }
3003
3004 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3005 because such sections are not SEC_ALLOC and thus ld.so will
3006 not process them. */
3007 if (unresolved_reloc
3008 && !((input_section->flags & SEC_DEBUGGING) != 0
3009 && h->def_dynamic))
3010 (*_bfd_error_handler)
3011 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3012 input_bfd,
3013 input_section,
3014 (long) rel->r_offset,
3015 howto->name,
3016 h->root.root.string);
3017
3018 if (r_type == R_390_20
3019 || r_type == R_390_GOT20
3020 || r_type == R_390_GOTPLT20
3021 || r_type == R_390_TLS_GOTIE20)
3022 {
3023 relocation += rel->r_addend;
3024 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3025 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3026 contents, rel->r_offset,
3027 relocation, 0);
3028 }
3029 else
3030 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3031 contents, rel->r_offset,
3032 relocation, rel->r_addend);
3033
3034 if (r != bfd_reloc_ok)
3035 {
3036 const char *name;
3037
3038 if (h != NULL)
3039 name = h->root.root.string;
3040 else
3041 {
3042 name = bfd_elf_string_from_elf_section (input_bfd,
3043 symtab_hdr->sh_link,
3044 sym->st_name);
3045 if (name == NULL)
3046 return FALSE;
3047 if (*name == '\0')
3048 name = bfd_section_name (input_bfd, sec);
3049 }
3050
3051 if (r == bfd_reloc_overflow)
3052 {
3053
3054 if (! ((*info->callbacks->reloc_overflow)
3055 (info, (h ? &h->root : NULL), name, howto->name,
3056 (bfd_vma) 0, input_bfd, input_section,
3057 rel->r_offset)))
3058 return FALSE;
3059 }
3060 else
3061 {
3062 (*_bfd_error_handler)
3063 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3064 input_bfd, input_section,
3065 (long) rel->r_offset, name, (int) r);
3066 return FALSE;
3067 }
3068 }
3069 }
3070
3071 return TRUE;
3072 }
3073
3074 /* Finish up dynamic symbol handling. We set the contents of various
3075 dynamic sections here. */
3076
3077 static bfd_boolean
3078 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3079 bfd *output_bfd;
3080 struct bfd_link_info *info;
3081 struct elf_link_hash_entry *h;
3082 Elf_Internal_Sym *sym;
3083 {
3084 struct elf_s390_link_hash_table *htab;
3085
3086 htab = elf_s390_hash_table (info);
3087
3088 if (h->plt.offset != (bfd_vma) -1)
3089 {
3090 bfd_vma plt_index;
3091 bfd_vma got_offset;
3092 Elf_Internal_Rela rela;
3093 bfd_byte *loc;
3094
3095 /* This symbol has an entry in the procedure linkage table. Set
3096 it up. */
3097
3098 if (h->dynindx == -1
3099 || htab->splt == NULL
3100 || htab->sgotplt == NULL
3101 || htab->srelplt == NULL)
3102 abort ();
3103
3104 /* Calc. index no.
3105 Current offset - size first entry / entry size. */
3106 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3107
3108 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
3109 addr & GOT addr. */
3110 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3111
3112 /* Fill in the blueprint of a PLT. */
3113 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3114 htab->splt->contents + h->plt.offset);
3115 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3116 htab->splt->contents + h->plt.offset + 4);
3117 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3118 htab->splt->contents + h->plt.offset + 8);
3119 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3120 htab->splt->contents + h->plt.offset + 12);
3121 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3122 htab->splt->contents + h->plt.offset + 16);
3123 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5,
3124 htab->splt->contents + h->plt.offset + 20);
3125 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6,
3126 htab->splt->contents + h->plt.offset + 24);
3127 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7,
3128 htab->splt->contents + h->plt.offset + 28);
3129 /* Fixup the relative address to the GOT entry */
3130 bfd_put_32 (output_bfd,
3131 (htab->sgotplt->output_section->vma +
3132 htab->sgotplt->output_offset + got_offset
3133 - (htab->splt->output_section->vma + h->plt.offset))/2,
3134 htab->splt->contents + h->plt.offset + 2);
3135 /* Fixup the relative branch to PLT 0 */
3136 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3137 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3138 htab->splt->contents + h->plt.offset + 24);
3139 /* Fixup offset into symbol table */
3140 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3141 htab->splt->contents + h->plt.offset + 28);
3142
3143 /* Fill in the entry in the global offset table.
3144 Points to instruction after GOT offset. */
3145 bfd_put_64 (output_bfd,
3146 (htab->splt->output_section->vma
3147 + htab->splt->output_offset
3148 + h->plt.offset
3149 + 14),
3150 htab->sgotplt->contents + got_offset);
3151
3152 /* Fill in the entry in the .rela.plt section. */
3153 rela.r_offset = (htab->sgotplt->output_section->vma
3154 + htab->sgotplt->output_offset
3155 + got_offset);
3156 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3157 rela.r_addend = 0;
3158 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela);
3159 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3160
3161 if (!h->def_regular)
3162 {
3163 /* Mark the symbol as undefined, rather than as defined in
3164 the .plt section. Leave the value alone. This is a clue
3165 for the dynamic linker, to make function pointer
3166 comparisons work between an application and shared
3167 library. */
3168 sym->st_shndx = SHN_UNDEF;
3169 }
3170 }
3171
3172 if (h->got.offset != (bfd_vma) -1
3173 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3174 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3175 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3176 {
3177 Elf_Internal_Rela rela;
3178 bfd_byte *loc;
3179
3180 /* This symbol has an entry in the global offset table. Set it
3181 up. */
3182 if (htab->sgot == NULL || htab->srelgot == NULL)
3183 abort ();
3184
3185 rela.r_offset = (htab->sgot->output_section->vma
3186 + htab->sgot->output_offset
3187 + (h->got.offset &~ (bfd_vma) 1));
3188
3189 /* If this is a static link, or it is a -Bsymbolic link and the
3190 symbol is defined locally or was forced to be local because
3191 of a version file, we just want to emit a RELATIVE reloc.
3192 The entry in the global offset table will already have been
3193 initialized in the relocate_section function. */
3194 if (info->shared
3195 && (info->symbolic
3196 || h->dynindx == -1
3197 || h->forced_local)
3198 && h->def_regular)
3199 {
3200 BFD_ASSERT((h->got.offset & 1) != 0);
3201 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3202 rela.r_addend = (h->root.u.def.value
3203 + h->root.u.def.section->output_section->vma
3204 + h->root.u.def.section->output_offset);
3205 }
3206 else
3207 {
3208 BFD_ASSERT((h->got.offset & 1) == 0);
3209 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3210 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3211 rela.r_addend = 0;
3212 }
3213
3214 loc = htab->srelgot->contents;
3215 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3216 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3217 }
3218
3219 if (h->needs_copy)
3220 {
3221 Elf_Internal_Rela rela;
3222 bfd_byte *loc;
3223
3224 /* This symbols needs a copy reloc. Set it up. */
3225
3226 if (h->dynindx == -1
3227 || (h->root.type != bfd_link_hash_defined
3228 && h->root.type != bfd_link_hash_defweak)
3229 || htab->srelbss == NULL)
3230 abort ();
3231
3232 rela.r_offset = (h->root.u.def.value
3233 + h->root.u.def.section->output_section->vma
3234 + h->root.u.def.section->output_offset);
3235 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3236 rela.r_addend = 0;
3237 loc = htab->srelbss->contents;
3238 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3239 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3240 }
3241
3242 /* Mark some specially defined symbols as absolute. */
3243 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3244 || h == htab->elf.hgot
3245 || h == htab->elf.hplt)
3246 sym->st_shndx = SHN_ABS;
3247
3248 return TRUE;
3249 }
3250
3251 /* Used to decide how to sort relocs in an optimal manner for the
3252 dynamic linker, before writing them out. */
3253
3254 static enum elf_reloc_type_class
3255 elf_s390_reloc_type_class (rela)
3256 const Elf_Internal_Rela *rela;
3257 {
3258 switch ((int) ELF64_R_TYPE (rela->r_info))
3259 {
3260 case R_390_RELATIVE:
3261 return reloc_class_relative;
3262 case R_390_JMP_SLOT:
3263 return reloc_class_plt;
3264 case R_390_COPY:
3265 return reloc_class_copy;
3266 default:
3267 return reloc_class_normal;
3268 }
3269 }
3270
3271 /* Finish up the dynamic sections. */
3272
3273 static bfd_boolean
3274 elf_s390_finish_dynamic_sections (output_bfd, info)
3275 bfd *output_bfd;
3276 struct bfd_link_info *info;
3277 {
3278 struct elf_s390_link_hash_table *htab;
3279 bfd *dynobj;
3280 asection *sdyn;
3281
3282 htab = elf_s390_hash_table (info);
3283 dynobj = htab->elf.dynobj;
3284 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3285
3286 if (htab->elf.dynamic_sections_created)
3287 {
3288 Elf64_External_Dyn *dyncon, *dynconend;
3289
3290 if (sdyn == NULL || htab->sgot == NULL)
3291 abort ();
3292
3293 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3294 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3295 for (; dyncon < dynconend; dyncon++)
3296 {
3297 Elf_Internal_Dyn dyn;
3298 asection *s;
3299
3300 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3301
3302 switch (dyn.d_tag)
3303 {
3304 default:
3305 continue;
3306
3307 case DT_PLTGOT:
3308 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3309 break;
3310
3311 case DT_JMPREL:
3312 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3313 break;
3314
3315 case DT_PLTRELSZ:
3316 s = htab->srelplt->output_section;
3317 dyn.d_un.d_val = s->size;
3318 break;
3319
3320 case DT_RELASZ:
3321 /* The procedure linkage table relocs (DT_JMPREL) should
3322 not be included in the overall relocs (DT_RELA).
3323 Therefore, we override the DT_RELASZ entry here to
3324 make it not include the JMPREL relocs. Since the
3325 linker script arranges for .rela.plt to follow all
3326 other relocation sections, we don't have to worry
3327 about changing the DT_RELA entry. */
3328 s = htab->srelplt->output_section;
3329 dyn.d_un.d_val -= s->size;
3330 break;
3331 }
3332
3333 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3334 }
3335
3336 /* Fill in the special first entry in the procedure linkage table. */
3337 if (htab->splt && htab->splt->size > 0)
3338 {
3339 /* fill in blueprint for plt 0 entry */
3340 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0,
3341 htab->splt->contents );
3342 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3343 htab->splt->contents +4 );
3344 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3345 htab->splt->contents +12 );
3346 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3347 htab->splt->contents +16 );
3348 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3349 htab->splt->contents +20 );
3350 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6,
3351 htab->splt->contents + 24);
3352 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7,
3353 htab->splt->contents + 28 );
3354 /* Fixup relative address to start of GOT */
3355 bfd_put_32 (output_bfd,
3356 (htab->sgotplt->output_section->vma +
3357 htab->sgotplt->output_offset
3358 - htab->splt->output_section->vma - 6)/2,
3359 htab->splt->contents + 8);
3360 }
3361 elf_section_data (htab->splt->output_section)
3362 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE;
3363 }
3364
3365 if (htab->sgotplt)
3366 {
3367 /* Fill in the first three entries in the global offset table. */
3368 if (htab->sgotplt->size > 0)
3369 {
3370 bfd_put_64 (output_bfd,
3371 (sdyn == NULL ? (bfd_vma) 0
3372 : sdyn->output_section->vma + sdyn->output_offset),
3373 htab->sgotplt->contents);
3374 /* One entry for shared object struct ptr. */
3375 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3376 /* One entry for _dl_runtime_resolve. */
3377 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12);
3378 }
3379
3380 elf_section_data (htab->sgot->output_section)
3381 ->this_hdr.sh_entsize = 8;
3382 }
3383 return TRUE;
3384 }
3385
3386 /* Return address for Ith PLT stub in section PLT, for relocation REL
3387 or (bfd_vma) -1 if it should not be included. */
3388
3389 static bfd_vma
3390 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3391 const arelent *rel ATTRIBUTE_UNUSED)
3392 {
3393 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3394 }
3395
3396
3397 /* Why was the hash table entry size definition changed from
3398 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3399 this is the only reason for the s390_elf64_size_info structure. */
3400
3401 const struct elf_size_info s390_elf64_size_info =
3402 {
3403 sizeof (Elf64_External_Ehdr),
3404 sizeof (Elf64_External_Phdr),
3405 sizeof (Elf64_External_Shdr),
3406 sizeof (Elf64_External_Rel),
3407 sizeof (Elf64_External_Rela),
3408 sizeof (Elf64_External_Sym),
3409 sizeof (Elf64_External_Dyn),
3410 sizeof (Elf_External_Note),
3411 8, /* hash-table entry size. */
3412 1, /* internal relocations per external relocations. */
3413 64, /* arch_size. */
3414 3, /* log_file_align. */
3415 ELFCLASS64, EV_CURRENT,
3416 bfd_elf64_write_out_phdrs,
3417 bfd_elf64_write_shdrs_and_ehdr,
3418 bfd_elf64_checksum_contents,
3419 bfd_elf64_write_relocs,
3420 bfd_elf64_swap_symbol_in,
3421 bfd_elf64_swap_symbol_out,
3422 bfd_elf64_slurp_reloc_table,
3423 bfd_elf64_slurp_symbol_table,
3424 bfd_elf64_swap_dyn_in,
3425 bfd_elf64_swap_dyn_out,
3426 bfd_elf64_swap_reloc_in,
3427 bfd_elf64_swap_reloc_out,
3428 bfd_elf64_swap_reloca_in,
3429 bfd_elf64_swap_reloca_out
3430 };
3431
3432 #define TARGET_BIG_SYM bfd_elf64_s390_vec
3433 #define TARGET_BIG_NAME "elf64-s390"
3434 #define ELF_ARCH bfd_arch_s390
3435 #define ELF_MACHINE_CODE EM_S390
3436 #define ELF_MACHINE_ALT1 EM_S390_OLD
3437 #define ELF_MAXPAGESIZE 0x1000
3438
3439 #define elf_backend_size_info s390_elf64_size_info
3440
3441 #define elf_backend_can_gc_sections 1
3442 #define elf_backend_can_refcount 1
3443 #define elf_backend_want_got_plt 1
3444 #define elf_backend_plt_readonly 1
3445 #define elf_backend_want_plt_sym 0
3446 #define elf_backend_got_header_size 24
3447 #define elf_backend_rela_normal 1
3448
3449 #define elf_info_to_howto elf_s390_info_to_howto
3450
3451 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3452 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3453 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3454 #define bfd_elf64_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
3455
3456 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3457 #define elf_backend_check_relocs elf_s390_check_relocs
3458 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3459 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3460 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3461 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3462 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3463 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3464 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3465 #define elf_backend_relocate_section elf_s390_relocate_section
3466 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3467 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3468 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3469 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3470
3471 #define bfd_elf64_mkobject elf_s390_mkobject
3472 #define elf_backend_object_p elf_s390_object_p
3473
3474 #include "elf64-target.h"
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