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* linker.c (bfd_link_hash_traverse): Follow warning symbol link.
[thirdparty/binutils-gdb.git] / bfd / elf64-s390.c
1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
3 2010, 2011 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 /* NOTE: Keep this structure in sync with
633 the one declared in elf32-s390.c. */
634 struct elf_s390_obj_tdata
635 {
636 struct elf_obj_tdata root;
637
638 /* TLS type for each local got entry. */
639 char *local_got_tls_type;
640 };
641
642 #define elf_s390_tdata(abfd) \
643 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
644
645 #define elf_s390_local_got_tls_type(abfd) \
646 (elf_s390_tdata (abfd)->local_got_tls_type)
647
648 #define is_s390_elf(bfd) \
649 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
650 && elf_tdata (bfd) != NULL \
651 && elf_object_id (bfd) == S390_ELF_DATA)
652
653 static bfd_boolean
654 elf_s390_mkobject (bfd *abfd)
655 {
656 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata),
657 S390_ELF_DATA);
658 }
659
660 static bfd_boolean
661 elf_s390_object_p (abfd)
662 bfd *abfd;
663 {
664 /* Set the right machine number for an s390 elf32 file. */
665 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
666 }
667
668 /* s390 ELF linker hash table. */
669
670 struct elf_s390_link_hash_table
671 {
672 struct elf_link_hash_table elf;
673
674 /* Short-cuts to get to dynamic linker sections. */
675 asection *sgot;
676 asection *sgotplt;
677 asection *srelgot;
678 asection *splt;
679 asection *srelplt;
680 asection *sdynbss;
681 asection *srelbss;
682
683 union {
684 bfd_signed_vma refcount;
685 bfd_vma offset;
686 } tls_ldm_got;
687
688 /* Small local sym cache. */
689 struct sym_cache sym_cache;
690 };
691
692 /* Get the s390 ELF linker hash table from a link_info structure. */
693
694 #define elf_s390_hash_table(p) \
695 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
696 == S390_ELF_DATA ? ((struct elf_s390_link_hash_table *) ((p)->hash)) : NULL)
697
698 /* Create an entry in an s390 ELF linker hash table. */
699
700 static struct bfd_hash_entry *
701 link_hash_newfunc (entry, table, string)
702 struct bfd_hash_entry *entry;
703 struct bfd_hash_table *table;
704 const char *string;
705 {
706 /* Allocate the structure if it has not already been allocated by a
707 subclass. */
708 if (entry == NULL)
709 {
710 entry = bfd_hash_allocate (table,
711 sizeof (struct elf_s390_link_hash_entry));
712 if (entry == NULL)
713 return entry;
714 }
715
716 /* Call the allocation method of the superclass. */
717 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
718 if (entry != NULL)
719 {
720 struct elf_s390_link_hash_entry *eh;
721
722 eh = (struct elf_s390_link_hash_entry *) entry;
723 eh->dyn_relocs = NULL;
724 eh->gotplt_refcount = 0;
725 eh->tls_type = GOT_UNKNOWN;
726 }
727
728 return entry;
729 }
730
731 /* Create an s390 ELF linker hash table. */
732
733 static struct bfd_link_hash_table *
734 elf_s390_link_hash_table_create (abfd)
735 bfd *abfd;
736 {
737 struct elf_s390_link_hash_table *ret;
738 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
739
740 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
741 if (ret == NULL)
742 return NULL;
743
744 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
745 sizeof (struct elf_s390_link_hash_entry),
746 S390_ELF_DATA))
747 {
748 free (ret);
749 return NULL;
750 }
751
752 ret->sgot = NULL;
753 ret->sgotplt = NULL;
754 ret->srelgot = NULL;
755 ret->splt = NULL;
756 ret->srelplt = NULL;
757 ret->sdynbss = NULL;
758 ret->srelbss = NULL;
759 ret->tls_ldm_got.refcount = 0;
760 ret->sym_cache.abfd = NULL;
761
762 return &ret->elf.root;
763 }
764
765 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
766 shortcuts to them in our hash table. */
767
768 static bfd_boolean
769 create_got_section (bfd *dynobj,
770 struct bfd_link_info *info)
771 {
772 struct elf_s390_link_hash_table *htab;
773
774 if (! _bfd_elf_create_got_section (dynobj, info))
775 return FALSE;
776
777 htab = elf_s390_hash_table (info);
778 if (htab == NULL)
779 return FALSE;
780
781 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
782 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
783 htab->srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
784 if (!htab->sgot || !htab->sgotplt || !htab->srelgot)
785 abort ();
786 return TRUE;
787 }
788
789 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
790 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
791 hash table. */
792
793 static bfd_boolean
794 elf_s390_create_dynamic_sections (bfd *dynobj,
795 struct bfd_link_info *info)
796 {
797 struct elf_s390_link_hash_table *htab;
798
799 htab = elf_s390_hash_table (info);
800 if (htab == NULL)
801 return FALSE;
802
803 if (!htab->sgot && !create_got_section (dynobj, info))
804 return FALSE;
805
806 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
807 return FALSE;
808
809 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
810 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
811 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
812 if (!info->shared)
813 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
814
815 if (!htab->splt || !htab->srelplt || !htab->sdynbss
816 || (!info->shared && !htab->srelbss))
817 abort ();
818
819 return TRUE;
820 }
821
822 /* Copy the extra info we tack onto an elf_link_hash_entry. */
823
824 static void
825 elf_s390_copy_indirect_symbol (info, dir, ind)
826 struct bfd_link_info *info;
827 struct elf_link_hash_entry *dir, *ind;
828 {
829 struct elf_s390_link_hash_entry *edir, *eind;
830
831 edir = (struct elf_s390_link_hash_entry *) dir;
832 eind = (struct elf_s390_link_hash_entry *) ind;
833
834 if (eind->dyn_relocs != NULL)
835 {
836 if (edir->dyn_relocs != NULL)
837 {
838 struct elf_s390_dyn_relocs **pp;
839 struct elf_s390_dyn_relocs *p;
840
841 /* Add reloc counts against the indirect sym to the direct sym
842 list. Merge any entries against the same section. */
843 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
844 {
845 struct elf_s390_dyn_relocs *q;
846
847 for (q = edir->dyn_relocs; q != NULL; q = q->next)
848 if (q->sec == p->sec)
849 {
850 q->pc_count += p->pc_count;
851 q->count += p->count;
852 *pp = p->next;
853 break;
854 }
855 if (q == NULL)
856 pp = &p->next;
857 }
858 *pp = edir->dyn_relocs;
859 }
860
861 edir->dyn_relocs = eind->dyn_relocs;
862 eind->dyn_relocs = NULL;
863 }
864
865 if (ind->root.type == bfd_link_hash_indirect
866 && dir->got.refcount <= 0)
867 {
868 edir->tls_type = eind->tls_type;
869 eind->tls_type = GOT_UNKNOWN;
870 }
871
872 if (ELIMINATE_COPY_RELOCS
873 && ind->root.type != bfd_link_hash_indirect
874 && dir->dynamic_adjusted)
875 {
876 /* If called to transfer flags for a weakdef during processing
877 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
878 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
879 dir->ref_dynamic |= ind->ref_dynamic;
880 dir->ref_regular |= ind->ref_regular;
881 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
882 dir->needs_plt |= ind->needs_plt;
883 }
884 else
885 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
886 }
887
888 static int
889 elf_s390_tls_transition (info, r_type, is_local)
890 struct bfd_link_info *info;
891 int r_type;
892 int is_local;
893 {
894 if (info->shared)
895 return r_type;
896
897 switch (r_type)
898 {
899 case R_390_TLS_GD64:
900 case R_390_TLS_IE64:
901 if (is_local)
902 return R_390_TLS_LE64;
903 return R_390_TLS_IE64;
904 case R_390_TLS_GOTIE64:
905 if (is_local)
906 return R_390_TLS_LE64;
907 return R_390_TLS_GOTIE64;
908 case R_390_TLS_LDM64:
909 return R_390_TLS_LE64;
910 }
911
912 return r_type;
913 }
914
915 /* Look through the relocs for a section during the first phase, and
916 allocate space in the global offset table or procedure linkage
917 table. */
918
919 static bfd_boolean
920 elf_s390_check_relocs (bfd *abfd,
921 struct bfd_link_info *info,
922 asection *sec,
923 const Elf_Internal_Rela *relocs)
924 {
925 struct elf_s390_link_hash_table *htab;
926 Elf_Internal_Shdr *symtab_hdr;
927 struct elf_link_hash_entry **sym_hashes;
928 const Elf_Internal_Rela *rel;
929 const Elf_Internal_Rela *rel_end;
930 asection *sreloc;
931 bfd_signed_vma *local_got_refcounts;
932 int tls_type, old_tls_type;
933
934 if (info->relocatable)
935 return TRUE;
936
937 BFD_ASSERT (is_s390_elf (abfd));
938
939 htab = elf_s390_hash_table (info);
940 if (htab == NULL)
941 return FALSE;
942
943 symtab_hdr = &elf_symtab_hdr (abfd);
944 sym_hashes = elf_sym_hashes (abfd);
945 local_got_refcounts = elf_local_got_refcounts (abfd);
946
947 sreloc = NULL;
948
949 rel_end = relocs + sec->reloc_count;
950 for (rel = relocs; rel < rel_end; rel++)
951 {
952 unsigned int r_type;
953 unsigned long r_symndx;
954 struct elf_link_hash_entry *h;
955
956 r_symndx = ELF64_R_SYM (rel->r_info);
957
958 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
959 {
960 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
961 abfd,
962 r_symndx);
963 return FALSE;
964 }
965
966 if (r_symndx < symtab_hdr->sh_info)
967 h = NULL;
968 else
969 {
970 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
971 while (h->root.type == bfd_link_hash_indirect
972 || h->root.type == bfd_link_hash_warning)
973 h = (struct elf_link_hash_entry *) h->root.u.i.link;
974 }
975
976 /* Create got section and local_got_refcounts array if they
977 are needed. */
978 r_type = elf_s390_tls_transition (info,
979 ELF64_R_TYPE (rel->r_info),
980 h == NULL);
981 switch (r_type)
982 {
983 case R_390_GOT12:
984 case R_390_GOT16:
985 case R_390_GOT20:
986 case R_390_GOT32:
987 case R_390_GOT64:
988 case R_390_GOTENT:
989 case R_390_GOTPLT12:
990 case R_390_GOTPLT16:
991 case R_390_GOTPLT20:
992 case R_390_GOTPLT32:
993 case R_390_GOTPLT64:
994 case R_390_GOTPLTENT:
995 case R_390_TLS_GD64:
996 case R_390_TLS_GOTIE12:
997 case R_390_TLS_GOTIE20:
998 case R_390_TLS_GOTIE64:
999 case R_390_TLS_IEENT:
1000 case R_390_TLS_IE64:
1001 case R_390_TLS_LDM64:
1002 if (h == NULL
1003 && local_got_refcounts == NULL)
1004 {
1005 bfd_size_type size;
1006
1007 size = symtab_hdr->sh_info;
1008 size *= (sizeof (bfd_signed_vma) + sizeof(char));
1009 local_got_refcounts = ((bfd_signed_vma *)
1010 bfd_zalloc (abfd, size));
1011 if (local_got_refcounts == NULL)
1012 return FALSE;
1013 elf_local_got_refcounts (abfd) = local_got_refcounts;
1014 elf_s390_local_got_tls_type (abfd)
1015 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1016 }
1017 /* Fall through. */
1018 case R_390_GOTOFF16:
1019 case R_390_GOTOFF32:
1020 case R_390_GOTOFF64:
1021 case R_390_GOTPC:
1022 case R_390_GOTPCDBL:
1023 if (htab->sgot == NULL)
1024 {
1025 if (htab->elf.dynobj == NULL)
1026 htab->elf.dynobj = abfd;
1027 if (!create_got_section (htab->elf.dynobj, info))
1028 return FALSE;
1029 }
1030 }
1031
1032 switch (r_type)
1033 {
1034 case R_390_GOTOFF16:
1035 case R_390_GOTOFF32:
1036 case R_390_GOTOFF64:
1037 case R_390_GOTPC:
1038 case R_390_GOTPCDBL:
1039 /* Got is created, nothing to be done. */
1040 break;
1041
1042 case R_390_PLT16DBL:
1043 case R_390_PLT32:
1044 case R_390_PLT32DBL:
1045 case R_390_PLT64:
1046 case R_390_PLTOFF16:
1047 case R_390_PLTOFF32:
1048 case R_390_PLTOFF64:
1049 /* This symbol requires a procedure linkage table entry. We
1050 actually build the entry in adjust_dynamic_symbol,
1051 because this might be a case of linking PIC code which is
1052 never referenced by a dynamic object, in which case we
1053 don't need to generate a procedure linkage table entry
1054 after all. */
1055
1056 /* If this is a local symbol, we resolve it directly without
1057 creating a procedure linkage table entry. */
1058 if (h != NULL)
1059 {
1060 h->needs_plt = 1;
1061 h->plt.refcount += 1;
1062 }
1063 break;
1064
1065 case R_390_GOTPLT12:
1066 case R_390_GOTPLT16:
1067 case R_390_GOTPLT20:
1068 case R_390_GOTPLT32:
1069 case R_390_GOTPLT64:
1070 case R_390_GOTPLTENT:
1071 /* This symbol requires either a procedure linkage table entry
1072 or an entry in the local got. We actually build the entry
1073 in adjust_dynamic_symbol because whether this is really a
1074 global reference can change and with it the fact if we have
1075 to create a plt entry or a local got entry. To be able to
1076 make a once global symbol a local one we have to keep track
1077 of the number of gotplt references that exist for this
1078 symbol. */
1079 if (h != NULL)
1080 {
1081 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1082 h->needs_plt = 1;
1083 h->plt.refcount += 1;
1084 }
1085 else
1086 local_got_refcounts[r_symndx] += 1;
1087 break;
1088
1089 case R_390_TLS_LDM64:
1090 htab->tls_ldm_got.refcount += 1;
1091 break;
1092
1093 case R_390_TLS_IE64:
1094 case R_390_TLS_GOTIE12:
1095 case R_390_TLS_GOTIE20:
1096 case R_390_TLS_GOTIE64:
1097 case R_390_TLS_IEENT:
1098 if (info->shared)
1099 info->flags |= DF_STATIC_TLS;
1100 /* Fall through */
1101
1102 case R_390_GOT12:
1103 case R_390_GOT16:
1104 case R_390_GOT20:
1105 case R_390_GOT32:
1106 case R_390_GOT64:
1107 case R_390_GOTENT:
1108 case R_390_TLS_GD64:
1109 /* This symbol requires a global offset table entry. */
1110 switch (r_type)
1111 {
1112 default:
1113 case R_390_GOT12:
1114 case R_390_GOT16:
1115 case R_390_GOT20:
1116 case R_390_GOT32:
1117 case R_390_GOTENT:
1118 tls_type = GOT_NORMAL;
1119 break;
1120 case R_390_TLS_GD64:
1121 tls_type = GOT_TLS_GD;
1122 break;
1123 case R_390_TLS_IE64:
1124 case R_390_TLS_GOTIE64:
1125 tls_type = GOT_TLS_IE;
1126 break;
1127 case R_390_TLS_GOTIE12:
1128 case R_390_TLS_GOTIE20:
1129 case R_390_TLS_IEENT:
1130 tls_type = GOT_TLS_IE_NLT;
1131 break;
1132 }
1133
1134 if (h != NULL)
1135 {
1136 h->got.refcount += 1;
1137 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1138 }
1139 else
1140 {
1141 local_got_refcounts[r_symndx] += 1;
1142 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1143 }
1144 /* If a TLS symbol is accessed using IE at least once,
1145 there is no point to use dynamic model for it. */
1146 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1147 {
1148 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1149 {
1150 (*_bfd_error_handler)
1151 (_("%B: `%s' accessed both as normal and thread local symbol"),
1152 abfd, h->root.root.string);
1153 return FALSE;
1154 }
1155 if (old_tls_type > tls_type)
1156 tls_type = old_tls_type;
1157 }
1158
1159 if (old_tls_type != tls_type)
1160 {
1161 if (h != NULL)
1162 elf_s390_hash_entry (h)->tls_type = tls_type;
1163 else
1164 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1165 }
1166
1167 if (r_type != R_390_TLS_IE64)
1168 break;
1169 /* Fall through */
1170
1171 case R_390_TLS_LE64:
1172 if (!info->shared)
1173 break;
1174 info->flags |= DF_STATIC_TLS;
1175 /* Fall through */
1176
1177 case R_390_8:
1178 case R_390_16:
1179 case R_390_32:
1180 case R_390_64:
1181 case R_390_PC16:
1182 case R_390_PC16DBL:
1183 case R_390_PC32:
1184 case R_390_PC32DBL:
1185 case R_390_PC64:
1186 if (h != NULL && !info->shared)
1187 {
1188 /* If this reloc is in a read-only section, we might
1189 need a copy reloc. We can't check reliably at this
1190 stage whether the section is read-only, as input
1191 sections have not yet been mapped to output sections.
1192 Tentatively set the flag for now, and correct in
1193 adjust_dynamic_symbol. */
1194 h->non_got_ref = 1;
1195
1196 /* We may need a .plt entry if the function this reloc
1197 refers to is in a shared lib. */
1198 h->plt.refcount += 1;
1199 }
1200
1201 /* If we are creating a shared library, and this is a reloc
1202 against a global symbol, or a non PC relative reloc
1203 against a local symbol, then we need to copy the reloc
1204 into the shared library. However, if we are linking with
1205 -Bsymbolic, we do not need to copy a reloc against a
1206 global symbol which is defined in an object we are
1207 including in the link (i.e., DEF_REGULAR is set). At
1208 this point we have not seen all the input files, so it is
1209 possible that DEF_REGULAR is not set now but will be set
1210 later (it is never cleared). In case of a weak definition,
1211 DEF_REGULAR may be cleared later by a strong definition in
1212 a shared library. We account for that possibility below by
1213 storing information in the relocs_copied field of the hash
1214 table entry. A similar situation occurs when creating
1215 shared libraries and symbol visibility changes render the
1216 symbol local.
1217
1218 If on the other hand, we are creating an executable, we
1219 may need to keep relocations for symbols satisfied by a
1220 dynamic library if we manage to avoid copy relocs for the
1221 symbol. */
1222 if ((info->shared
1223 && (sec->flags & SEC_ALLOC) != 0
1224 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
1225 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
1226 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
1227 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
1228 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
1229 || (h != NULL
1230 && (! SYMBOLIC_BIND (info, h)
1231 || h->root.type == bfd_link_hash_defweak
1232 || !h->def_regular))))
1233 || (ELIMINATE_COPY_RELOCS
1234 && !info->shared
1235 && (sec->flags & SEC_ALLOC) != 0
1236 && h != NULL
1237 && (h->root.type == bfd_link_hash_defweak
1238 || !h->def_regular)))
1239 {
1240 struct elf_s390_dyn_relocs *p;
1241 struct elf_s390_dyn_relocs **head;
1242
1243 /* We must copy these reloc types into the output file.
1244 Create a reloc section in dynobj and make room for
1245 this reloc. */
1246 if (sreloc == NULL)
1247 {
1248 if (htab->elf.dynobj == NULL)
1249 htab->elf.dynobj = abfd;
1250
1251 sreloc = _bfd_elf_make_dynamic_reloc_section
1252 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ TRUE);
1253
1254 if (sreloc == NULL)
1255 return FALSE;
1256 }
1257
1258 /* If this is a global symbol, we count the number of
1259 relocations we need for this symbol. */
1260 if (h != NULL)
1261 {
1262 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1263 }
1264 else
1265 {
1266 /* Track dynamic relocs needed for local syms too.
1267 We really need local syms available to do this
1268 easily. Oh well. */
1269 asection *s;
1270 void *vpp;
1271 Elf_Internal_Sym *isym;
1272
1273 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1274 abfd, r_symndx);
1275 if (isym == NULL)
1276 return FALSE;
1277
1278 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1279 if (s == NULL)
1280 s = sec;
1281
1282 vpp = &elf_section_data (s)->local_dynrel;
1283 head = (struct elf_s390_dyn_relocs **) vpp;
1284 }
1285
1286 p = *head;
1287 if (p == NULL || p->sec != sec)
1288 {
1289 bfd_size_type amt = sizeof *p;
1290 p = ((struct elf_s390_dyn_relocs *)
1291 bfd_alloc (htab->elf.dynobj, amt));
1292 if (p == NULL)
1293 return FALSE;
1294 p->next = *head;
1295 *head = p;
1296 p->sec = sec;
1297 p->count = 0;
1298 p->pc_count = 0;
1299 }
1300
1301 p->count += 1;
1302 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
1303 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1304 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
1305 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
1306 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
1307 p->pc_count += 1;
1308 }
1309 break;
1310
1311 /* This relocation describes the C++ object vtable hierarchy.
1312 Reconstruct it for later use during GC. */
1313 case R_390_GNU_VTINHERIT:
1314 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1315 return FALSE;
1316 break;
1317
1318 /* This relocation describes which C++ vtable entries are actually
1319 used. Record for later use during GC. */
1320 case R_390_GNU_VTENTRY:
1321 BFD_ASSERT (h != NULL);
1322 if (h != NULL
1323 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1324 return FALSE;
1325 break;
1326
1327 default:
1328 break;
1329 }
1330 }
1331
1332 return TRUE;
1333 }
1334
1335 /* Return the section that should be marked against GC for a given
1336 relocation. */
1337
1338 static asection *
1339 elf_s390_gc_mark_hook (asection *sec,
1340 struct bfd_link_info *info,
1341 Elf_Internal_Rela *rel,
1342 struct elf_link_hash_entry *h,
1343 Elf_Internal_Sym *sym)
1344 {
1345 if (h != NULL)
1346 switch (ELF64_R_TYPE (rel->r_info))
1347 {
1348 case R_390_GNU_VTINHERIT:
1349 case R_390_GNU_VTENTRY:
1350 return NULL;
1351 }
1352
1353 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1354 }
1355
1356 /* Update the got entry reference counts for the section being removed. */
1357
1358 static bfd_boolean
1359 elf_s390_gc_sweep_hook (bfd *abfd,
1360 struct bfd_link_info *info,
1361 asection *sec,
1362 const Elf_Internal_Rela *relocs)
1363 {
1364 struct elf_s390_link_hash_table *htab;
1365 Elf_Internal_Shdr *symtab_hdr;
1366 struct elf_link_hash_entry **sym_hashes;
1367 bfd_signed_vma *local_got_refcounts;
1368 const Elf_Internal_Rela *rel, *relend;
1369
1370 if (info->relocatable)
1371 return TRUE;
1372
1373 htab = elf_s390_hash_table (info);
1374 if (htab == NULL)
1375 return FALSE;
1376
1377 elf_section_data (sec)->local_dynrel = NULL;
1378
1379 symtab_hdr = &elf_symtab_hdr (abfd);
1380 sym_hashes = elf_sym_hashes (abfd);
1381 local_got_refcounts = elf_local_got_refcounts (abfd);
1382
1383 relend = relocs + sec->reloc_count;
1384 for (rel = relocs; rel < relend; rel++)
1385 {
1386 unsigned long r_symndx;
1387 unsigned int r_type;
1388 struct elf_link_hash_entry *h = NULL;
1389
1390 r_symndx = ELF64_R_SYM (rel->r_info);
1391 if (r_symndx >= symtab_hdr->sh_info)
1392 {
1393 struct elf_s390_link_hash_entry *eh;
1394 struct elf_s390_dyn_relocs **pp;
1395 struct elf_s390_dyn_relocs *p;
1396
1397 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1398 while (h->root.type == bfd_link_hash_indirect
1399 || h->root.type == bfd_link_hash_warning)
1400 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1401 eh = (struct elf_s390_link_hash_entry *) h;
1402
1403 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1404 if (p->sec == sec)
1405 {
1406 /* Everything must go for SEC. */
1407 *pp = p->next;
1408 break;
1409 }
1410 }
1411
1412 r_type = ELF64_R_TYPE (rel->r_info);
1413 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1414 switch (r_type)
1415 {
1416 case R_390_TLS_LDM64:
1417 if (htab->tls_ldm_got.refcount > 0)
1418 htab->tls_ldm_got.refcount -= 1;
1419 break;
1420
1421 case R_390_TLS_GD64:
1422 case R_390_TLS_IE64:
1423 case R_390_TLS_GOTIE12:
1424 case R_390_TLS_GOTIE20:
1425 case R_390_TLS_GOTIE64:
1426 case R_390_TLS_IEENT:
1427 case R_390_GOT12:
1428 case R_390_GOT16:
1429 case R_390_GOT20:
1430 case R_390_GOT32:
1431 case R_390_GOT64:
1432 case R_390_GOTOFF16:
1433 case R_390_GOTOFF32:
1434 case R_390_GOTOFF64:
1435 case R_390_GOTPC:
1436 case R_390_GOTPCDBL:
1437 case R_390_GOTENT:
1438 if (h != NULL)
1439 {
1440 if (h->got.refcount > 0)
1441 h->got.refcount -= 1;
1442 }
1443 else if (local_got_refcounts != NULL)
1444 {
1445 if (local_got_refcounts[r_symndx] > 0)
1446 local_got_refcounts[r_symndx] -= 1;
1447 }
1448 break;
1449
1450 case R_390_8:
1451 case R_390_12:
1452 case R_390_16:
1453 case R_390_20:
1454 case R_390_32:
1455 case R_390_64:
1456 case R_390_PC16:
1457 case R_390_PC16DBL:
1458 case R_390_PC32:
1459 case R_390_PC32DBL:
1460 case R_390_PC64:
1461 if (info->shared)
1462 break;
1463 /* Fall through */
1464
1465 case R_390_PLT16DBL:
1466 case R_390_PLT32:
1467 case R_390_PLT32DBL:
1468 case R_390_PLT64:
1469 case R_390_PLTOFF16:
1470 case R_390_PLTOFF32:
1471 case R_390_PLTOFF64:
1472 if (h != NULL)
1473 {
1474 if (h->plt.refcount > 0)
1475 h->plt.refcount -= 1;
1476 }
1477 break;
1478
1479 case R_390_GOTPLT12:
1480 case R_390_GOTPLT16:
1481 case R_390_GOTPLT20:
1482 case R_390_GOTPLT32:
1483 case R_390_GOTPLT64:
1484 case R_390_GOTPLTENT:
1485 if (h != NULL)
1486 {
1487 if (h->plt.refcount > 0)
1488 {
1489 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1490 h->plt.refcount -= 1;
1491 }
1492 }
1493 else if (local_got_refcounts != NULL)
1494 {
1495 if (local_got_refcounts[r_symndx] > 0)
1496 local_got_refcounts[r_symndx] -= 1;
1497 }
1498 break;
1499
1500 default:
1501 break;
1502 }
1503 }
1504
1505 return TRUE;
1506 }
1507
1508 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1509 entry but we found we will not create any. Called when we find we will
1510 not have any PLT for this symbol, by for example
1511 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1512 or elf_s390_size_dynamic_sections if no dynamic sections will be
1513 created (we're only linking static objects). */
1514
1515 static void
1516 elf_s390_adjust_gotplt (h)
1517 struct elf_s390_link_hash_entry *h;
1518 {
1519 if (h->elf.root.type == bfd_link_hash_warning)
1520 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1521
1522 if (h->gotplt_refcount <= 0)
1523 return;
1524
1525 /* We simply add the number of gotplt references to the number
1526 * of got references for this symbol. */
1527 h->elf.got.refcount += h->gotplt_refcount;
1528 h->gotplt_refcount = -1;
1529 }
1530
1531 /* Adjust a symbol defined by a dynamic object and referenced by a
1532 regular object. The current definition is in some section of the
1533 dynamic object, but we're not including those sections. We have to
1534 change the definition to something the rest of the link can
1535 understand. */
1536
1537 static bfd_boolean
1538 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
1539 struct elf_link_hash_entry *h)
1540 {
1541 struct elf_s390_link_hash_table *htab;
1542 asection *s;
1543
1544 /* If this is a function, put it in the procedure linkage table. We
1545 will fill in the contents of the procedure linkage table later
1546 (although we could actually do it here). */
1547 if (h->type == STT_FUNC
1548 || h->needs_plt)
1549 {
1550 if (h->plt.refcount <= 0
1551 || SYMBOL_CALLS_LOCAL (info, h)
1552 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1553 && h->root.type == bfd_link_hash_undefweak))
1554 {
1555 /* This case can occur if we saw a PLT32 reloc in an input
1556 file, but the symbol was never referred to by a dynamic
1557 object, or if all references were garbage collected. In
1558 such a case, we don't actually need to build a procedure
1559 linkage table, and we can just do a PC32 reloc instead. */
1560 h->plt.offset = (bfd_vma) -1;
1561 h->needs_plt = 0;
1562 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1563 }
1564
1565 return TRUE;
1566 }
1567 else
1568 /* It's possible that we incorrectly decided a .plt reloc was
1569 needed for an R_390_PC32 reloc to a non-function sym in
1570 check_relocs. We can't decide accurately between function and
1571 non-function syms in check-relocs; Objects loaded later in
1572 the link may change h->type. So fix it now. */
1573 h->plt.offset = (bfd_vma) -1;
1574
1575 /* If this is a weak symbol, and there is a real definition, the
1576 processor independent code will have arranged for us to see the
1577 real definition first, and we can just use the same value. */
1578 if (h->u.weakdef != NULL)
1579 {
1580 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1581 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1582 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1583 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1584 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1585 h->non_got_ref = h->u.weakdef->non_got_ref;
1586 return TRUE;
1587 }
1588
1589 /* This is a reference to a symbol defined by a dynamic object which
1590 is not a function. */
1591
1592 /* If we are creating a shared library, we must presume that the
1593 only references to the symbol are via the global offset table.
1594 For such cases we need not do anything here; the relocations will
1595 be handled correctly by relocate_section. */
1596 if (info->shared)
1597 return TRUE;
1598
1599 /* If there are no references to this symbol that do not use the
1600 GOT, we don't need to generate a copy reloc. */
1601 if (!h->non_got_ref)
1602 return TRUE;
1603
1604 /* If -z nocopyreloc was given, we won't generate them either. */
1605 if (info->nocopyreloc)
1606 {
1607 h->non_got_ref = 0;
1608 return TRUE;
1609 }
1610
1611 if (ELIMINATE_COPY_RELOCS)
1612 {
1613 struct elf_s390_link_hash_entry * eh;
1614 struct elf_s390_dyn_relocs *p;
1615
1616 eh = (struct elf_s390_link_hash_entry *) h;
1617 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1618 {
1619 s = p->sec->output_section;
1620 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1621 break;
1622 }
1623
1624 /* If we didn't find any dynamic relocs in read-only sections, then
1625 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1626 if (p == NULL)
1627 {
1628 h->non_got_ref = 0;
1629 return TRUE;
1630 }
1631 }
1632
1633 if (h->size == 0)
1634 {
1635 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1636 h->root.root.string);
1637 return TRUE;
1638 }
1639
1640 /* We must allocate the symbol in our .dynbss section, which will
1641 become part of the .bss section of the executable. There will be
1642 an entry for this symbol in the .dynsym section. The dynamic
1643 object will contain position independent code, so all references
1644 from the dynamic object to this symbol will go through the global
1645 offset table. The dynamic linker will use the .dynsym entry to
1646 determine the address it must put in the global offset table, so
1647 both the dynamic object and the regular object will refer to the
1648 same memory location for the variable. */
1649
1650 htab = elf_s390_hash_table (info);
1651 if (htab == NULL)
1652 return FALSE;
1653
1654 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1655 copy the initial value out of the dynamic object and into the
1656 runtime process image. */
1657 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1658 {
1659 htab->srelbss->size += sizeof (Elf64_External_Rela);
1660 h->needs_copy = 1;
1661 }
1662
1663 s = htab->sdynbss;
1664
1665 return _bfd_elf_adjust_dynamic_copy (h, s);
1666 }
1667
1668 /* Allocate space in .plt, .got and associated reloc sections for
1669 dynamic relocs. */
1670
1671 static bfd_boolean
1672 allocate_dynrelocs (struct elf_link_hash_entry *h,
1673 void * inf)
1674 {
1675 struct bfd_link_info *info;
1676 struct elf_s390_link_hash_table *htab;
1677 struct elf_s390_link_hash_entry *eh;
1678 struct elf_s390_dyn_relocs *p;
1679
1680 if (h->root.type == bfd_link_hash_indirect)
1681 return TRUE;
1682
1683 info = (struct bfd_link_info *) inf;
1684 htab = elf_s390_hash_table (info);
1685 if (htab == NULL)
1686 return FALSE;
1687
1688 if (htab->elf.dynamic_sections_created
1689 && h->plt.refcount > 0)
1690 {
1691 /* Make sure this symbol is output as a dynamic symbol.
1692 Undefined weak syms won't yet be marked as dynamic. */
1693 if (h->dynindx == -1
1694 && !h->forced_local)
1695 {
1696 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1697 return FALSE;
1698 }
1699
1700 if (info->shared
1701 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1702 {
1703 asection *s = htab->splt;
1704
1705 /* If this is the first .plt entry, make room for the special
1706 first entry. */
1707 if (s->size == 0)
1708 s->size += PLT_FIRST_ENTRY_SIZE;
1709
1710 h->plt.offset = s->size;
1711
1712 /* If this symbol is not defined in a regular file, and we are
1713 not generating a shared library, then set the symbol to this
1714 location in the .plt. This is required to make function
1715 pointers compare as equal between the normal executable and
1716 the shared library. */
1717 if (! info->shared
1718 && !h->def_regular)
1719 {
1720 h->root.u.def.section = s;
1721 h->root.u.def.value = h->plt.offset;
1722 }
1723
1724 /* Make room for this entry. */
1725 s->size += PLT_ENTRY_SIZE;
1726
1727 /* We also need to make an entry in the .got.plt section, which
1728 will be placed in the .got section by the linker script. */
1729 htab->sgotplt->size += GOT_ENTRY_SIZE;
1730
1731 /* We also need to make an entry in the .rela.plt section. */
1732 htab->srelplt->size += sizeof (Elf64_External_Rela);
1733 }
1734 else
1735 {
1736 h->plt.offset = (bfd_vma) -1;
1737 h->needs_plt = 0;
1738 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1739 }
1740 }
1741 else
1742 {
1743 h->plt.offset = (bfd_vma) -1;
1744 h->needs_plt = 0;
1745 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1746 }
1747
1748 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to
1749 the binary, we can optimize a bit. IE64 and GOTIE64 get converted
1750 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT
1751 we can save the dynamic TLS relocation. */
1752 if (h->got.refcount > 0
1753 && !info->shared
1754 && h->dynindx == -1
1755 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1756 {
1757 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1758 /* For the GOTIE access without a literal pool entry the offset has
1759 to be stored somewhere. The immediate value in the instruction
1760 is not bit enough so the value is stored in the got. */
1761 {
1762 h->got.offset = htab->sgot->size;
1763 htab->sgot->size += GOT_ENTRY_SIZE;
1764 }
1765 else
1766 h->got.offset = (bfd_vma) -1;
1767 }
1768 else if (h->got.refcount > 0)
1769 {
1770 asection *s;
1771 bfd_boolean dyn;
1772 int tls_type = elf_s390_hash_entry(h)->tls_type;
1773
1774 /* Make sure this symbol is output as a dynamic symbol.
1775 Undefined weak syms won't yet be marked as dynamic. */
1776 if (h->dynindx == -1
1777 && !h->forced_local)
1778 {
1779 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1780 return FALSE;
1781 }
1782
1783 s = htab->sgot;
1784 h->got.offset = s->size;
1785 s->size += GOT_ENTRY_SIZE;
1786 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */
1787 if (tls_type == GOT_TLS_GD)
1788 s->size += GOT_ENTRY_SIZE;
1789 dyn = htab->elf.dynamic_sections_created;
1790 /* R_390_TLS_IE64 needs one dynamic relocation,
1791 R_390_TLS_GD64 needs one if local symbol and two if global. */
1792 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1793 || tls_type >= GOT_TLS_IE)
1794 htab->srelgot->size += sizeof (Elf64_External_Rela);
1795 else if (tls_type == GOT_TLS_GD)
1796 htab->srelgot->size += 2 * sizeof (Elf64_External_Rela);
1797 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1798 || h->root.type != bfd_link_hash_undefweak)
1799 && (info->shared
1800 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1801 htab->srelgot->size += sizeof (Elf64_External_Rela);
1802 }
1803 else
1804 h->got.offset = (bfd_vma) -1;
1805
1806 eh = (struct elf_s390_link_hash_entry *) h;
1807 if (eh->dyn_relocs == NULL)
1808 return TRUE;
1809
1810 /* In the shared -Bsymbolic case, discard space allocated for
1811 dynamic pc-relative relocs against symbols which turn out to be
1812 defined in regular objects. For the normal shared case, discard
1813 space for pc-relative relocs that have become local due to symbol
1814 visibility changes. */
1815
1816 if (info->shared)
1817 {
1818 if (SYMBOL_CALLS_LOCAL (info, h))
1819 {
1820 struct elf_s390_dyn_relocs **pp;
1821
1822 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1823 {
1824 p->count -= p->pc_count;
1825 p->pc_count = 0;
1826 if (p->count == 0)
1827 *pp = p->next;
1828 else
1829 pp = &p->next;
1830 }
1831 }
1832
1833 /* Also discard relocs on undefined weak syms with non-default
1834 visibility. */
1835 if (eh->dyn_relocs != NULL
1836 && h->root.type == bfd_link_hash_undefweak)
1837 {
1838 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1839 eh->dyn_relocs = NULL;
1840
1841 /* Make sure undefined weak symbols are output as a dynamic
1842 symbol in PIEs. */
1843 else if (h->dynindx == -1
1844 && !h->forced_local)
1845 {
1846 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1847 return FALSE;
1848 }
1849 }
1850 }
1851 else if (ELIMINATE_COPY_RELOCS)
1852 {
1853 /* For the non-shared case, discard space for relocs against
1854 symbols which turn out to need copy relocs or are not
1855 dynamic. */
1856
1857 if (!h->non_got_ref
1858 && ((h->def_dynamic
1859 && !h->def_regular)
1860 || (htab->elf.dynamic_sections_created
1861 && (h->root.type == bfd_link_hash_undefweak
1862 || h->root.type == bfd_link_hash_undefined))))
1863 {
1864 /* Make sure this symbol is output as a dynamic symbol.
1865 Undefined weak syms won't yet be marked as dynamic. */
1866 if (h->dynindx == -1
1867 && !h->forced_local)
1868 {
1869 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1870 return FALSE;
1871 }
1872
1873 /* If that succeeded, we know we'll be keeping all the
1874 relocs. */
1875 if (h->dynindx != -1)
1876 goto keep;
1877 }
1878
1879 eh->dyn_relocs = NULL;
1880
1881 keep: ;
1882 }
1883
1884 /* Finally, allocate space. */
1885 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1886 {
1887 asection *sreloc = elf_section_data (p->sec)->sreloc;
1888 sreloc->size += p->count * sizeof (Elf64_External_Rela);
1889 }
1890
1891 return TRUE;
1892 }
1893
1894 /* Find any dynamic relocs that apply to read-only sections. */
1895
1896 static bfd_boolean
1897 readonly_dynrelocs (h, inf)
1898 struct elf_link_hash_entry *h;
1899 PTR inf;
1900 {
1901 struct elf_s390_link_hash_entry *eh;
1902 struct elf_s390_dyn_relocs *p;
1903
1904 eh = (struct elf_s390_link_hash_entry *) h;
1905 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1906 {
1907 asection *s = p->sec->output_section;
1908
1909 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1910 {
1911 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1912
1913 info->flags |= DF_TEXTREL;
1914
1915 /* Not an error, just cut short the traversal. */
1916 return FALSE;
1917 }
1918 }
1919 return TRUE;
1920 }
1921
1922 /* Set the sizes of the dynamic sections. */
1923
1924 static bfd_boolean
1925 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1926 struct bfd_link_info *info)
1927 {
1928 struct elf_s390_link_hash_table *htab;
1929 bfd *dynobj;
1930 asection *s;
1931 bfd_boolean relocs;
1932 bfd *ibfd;
1933
1934 htab = elf_s390_hash_table (info);
1935 if (htab == NULL)
1936 return FALSE;
1937
1938 dynobj = htab->elf.dynobj;
1939 if (dynobj == NULL)
1940 abort ();
1941
1942 if (htab->elf.dynamic_sections_created)
1943 {
1944 /* Set the contents of the .interp section to the interpreter. */
1945 if (info->executable)
1946 {
1947 s = bfd_get_section_by_name (dynobj, ".interp");
1948 if (s == NULL)
1949 abort ();
1950 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1951 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1952 }
1953 }
1954
1955 /* Set up .got offsets for local syms, and space for local dynamic
1956 relocs. */
1957 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1958 {
1959 bfd_signed_vma *local_got;
1960 bfd_signed_vma *end_local_got;
1961 char *local_tls_type;
1962 bfd_size_type locsymcount;
1963 Elf_Internal_Shdr *symtab_hdr;
1964 asection *srela;
1965
1966 if (! is_s390_elf (ibfd))
1967 continue;
1968
1969 for (s = ibfd->sections; s != NULL; s = s->next)
1970 {
1971 struct elf_s390_dyn_relocs *p;
1972
1973 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
1974 {
1975 if (!bfd_is_abs_section (p->sec)
1976 && bfd_is_abs_section (p->sec->output_section))
1977 {
1978 /* Input section has been discarded, either because
1979 it is a copy of a linkonce section or due to
1980 linker script /DISCARD/, so we'll be discarding
1981 the relocs too. */
1982 }
1983 else if (p->count != 0)
1984 {
1985 srela = elf_section_data (p->sec)->sreloc;
1986 srela->size += p->count * sizeof (Elf64_External_Rela);
1987 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1988 info->flags |= DF_TEXTREL;
1989 }
1990 }
1991 }
1992
1993 local_got = elf_local_got_refcounts (ibfd);
1994 if (!local_got)
1995 continue;
1996
1997 symtab_hdr = &elf_symtab_hdr (ibfd);
1998 locsymcount = symtab_hdr->sh_info;
1999 end_local_got = local_got + locsymcount;
2000 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2001 s = htab->sgot;
2002 srela = htab->srelgot;
2003 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2004 {
2005 if (*local_got > 0)
2006 {
2007 *local_got = s->size;
2008 s->size += GOT_ENTRY_SIZE;
2009 if (*local_tls_type == GOT_TLS_GD)
2010 s->size += GOT_ENTRY_SIZE;
2011 if (info->shared)
2012 srela->size += sizeof (Elf64_External_Rela);
2013 }
2014 else
2015 *local_got = (bfd_vma) -1;
2016 }
2017 }
2018
2019 if (htab->tls_ldm_got.refcount > 0)
2020 {
2021 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64
2022 relocs. */
2023 htab->tls_ldm_got.offset = htab->sgot->size;
2024 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2025 htab->srelgot->size += sizeof (Elf64_External_Rela);
2026 }
2027 else
2028 htab->tls_ldm_got.offset = -1;
2029
2030 /* Allocate global sym .plt and .got entries, and space for global
2031 sym dynamic relocs. */
2032 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2033
2034 /* We now have determined the sizes of the various dynamic sections.
2035 Allocate memory for them. */
2036 relocs = FALSE;
2037 for (s = dynobj->sections; s != NULL; s = s->next)
2038 {
2039 if ((s->flags & SEC_LINKER_CREATED) == 0)
2040 continue;
2041
2042 if (s == htab->splt
2043 || s == htab->sgot
2044 || s == htab->sgotplt
2045 || s == htab->sdynbss)
2046 {
2047 /* Strip this section if we don't need it; see the
2048 comment below. */
2049 }
2050 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2051 {
2052 if (s->size != 0 && s != htab->srelplt)
2053 relocs = TRUE;
2054
2055 /* We use the reloc_count field as a counter if we need
2056 to copy relocs into the output file. */
2057 s->reloc_count = 0;
2058 }
2059 else
2060 {
2061 /* It's not one of our sections, so don't allocate space. */
2062 continue;
2063 }
2064
2065 if (s->size == 0)
2066 {
2067 /* If we don't need this section, strip it from the
2068 output file. This is to handle .rela.bss and
2069 .rela.plt. We must create it in
2070 create_dynamic_sections, because it must be created
2071 before the linker maps input sections to output
2072 sections. The linker does that before
2073 adjust_dynamic_symbol is called, and it is that
2074 function which decides whether anything needs to go
2075 into these sections. */
2076
2077 s->flags |= SEC_EXCLUDE;
2078 continue;
2079 }
2080
2081 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2082 continue;
2083
2084 /* Allocate memory for the section contents. We use bfd_zalloc
2085 here in case unused entries are not reclaimed before the
2086 section's contents are written out. This should not happen,
2087 but this way if it does, we get a R_390_NONE reloc instead
2088 of garbage. */
2089 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2090 if (s->contents == NULL)
2091 return FALSE;
2092 }
2093
2094 if (htab->elf.dynamic_sections_created)
2095 {
2096 /* Add some entries to the .dynamic section. We fill in the
2097 values later, in elf_s390_finish_dynamic_sections, but we
2098 must add the entries now so that we get the correct size for
2099 the .dynamic section. The DT_DEBUG entry is filled in by the
2100 dynamic linker and used by the debugger. */
2101 #define add_dynamic_entry(TAG, VAL) \
2102 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2103
2104 if (info->executable)
2105 {
2106 if (!add_dynamic_entry (DT_DEBUG, 0))
2107 return FALSE;
2108 }
2109
2110 if (htab->splt->size != 0)
2111 {
2112 if (!add_dynamic_entry (DT_PLTGOT, 0)
2113 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2114 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2115 || !add_dynamic_entry (DT_JMPREL, 0))
2116 return FALSE;
2117 }
2118
2119 if (relocs)
2120 {
2121 if (!add_dynamic_entry (DT_RELA, 0)
2122 || !add_dynamic_entry (DT_RELASZ, 0)
2123 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2124 return FALSE;
2125
2126 /* If any dynamic relocs apply to a read-only section,
2127 then we need a DT_TEXTREL entry. */
2128 if ((info->flags & DF_TEXTREL) == 0)
2129 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2130 (PTR) info);
2131
2132 if ((info->flags & DF_TEXTREL) != 0)
2133 {
2134 if (!add_dynamic_entry (DT_TEXTREL, 0))
2135 return FALSE;
2136 }
2137 }
2138 }
2139 #undef add_dynamic_entry
2140
2141 return TRUE;
2142 }
2143
2144 /* Return the base VMA address which should be subtracted from real addresses
2145 when resolving @dtpoff relocation.
2146 This is PT_TLS segment p_vaddr. */
2147
2148 static bfd_vma
2149 dtpoff_base (info)
2150 struct bfd_link_info *info;
2151 {
2152 /* If tls_sec is NULL, we should have signalled an error already. */
2153 if (elf_hash_table (info)->tls_sec == NULL)
2154 return 0;
2155 return elf_hash_table (info)->tls_sec->vma;
2156 }
2157
2158 /* Return the relocation value for @tpoff relocation
2159 if STT_TLS virtual address is ADDRESS. */
2160
2161 static bfd_vma
2162 tpoff (info, address)
2163 struct bfd_link_info *info;
2164 bfd_vma address;
2165 {
2166 struct elf_link_hash_table *htab = elf_hash_table (info);
2167
2168 /* If tls_sec is NULL, we should have signalled an error already. */
2169 if (htab->tls_sec == NULL)
2170 return 0;
2171 return htab->tls_size + htab->tls_sec->vma - address;
2172 }
2173
2174 /* Complain if TLS instruction relocation is against an invalid
2175 instruction. */
2176
2177 static void
2178 invalid_tls_insn (input_bfd, input_section, rel)
2179 bfd *input_bfd;
2180 asection *input_section;
2181 Elf_Internal_Rela *rel;
2182 {
2183 reloc_howto_type *howto;
2184
2185 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
2186 (*_bfd_error_handler)
2187 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2188 input_bfd,
2189 input_section,
2190 (long) rel->r_offset,
2191 howto->name);
2192 bfd_set_error (bfd_error_bad_value);
2193 }
2194
2195 /* Relocate a 390 ELF section. */
2196
2197 static bfd_boolean
2198 elf_s390_relocate_section (bfd *output_bfd,
2199 struct bfd_link_info *info,
2200 bfd *input_bfd,
2201 asection *input_section,
2202 bfd_byte *contents,
2203 Elf_Internal_Rela *relocs,
2204 Elf_Internal_Sym *local_syms,
2205 asection **local_sections)
2206 {
2207 struct elf_s390_link_hash_table *htab;
2208 Elf_Internal_Shdr *symtab_hdr;
2209 struct elf_link_hash_entry **sym_hashes;
2210 bfd_vma *local_got_offsets;
2211 Elf_Internal_Rela *rel;
2212 Elf_Internal_Rela *relend;
2213
2214 BFD_ASSERT (is_s390_elf (input_bfd));
2215
2216 htab = elf_s390_hash_table (info);
2217 if (htab == NULL)
2218 return FALSE;
2219
2220 symtab_hdr = &elf_symtab_hdr (input_bfd);
2221 sym_hashes = elf_sym_hashes (input_bfd);
2222 local_got_offsets = elf_local_got_offsets (input_bfd);
2223
2224 rel = relocs;
2225 relend = relocs + input_section->reloc_count;
2226 for (; rel < relend; rel++)
2227 {
2228 unsigned int r_type;
2229 reloc_howto_type *howto;
2230 unsigned long r_symndx;
2231 struct elf_link_hash_entry *h;
2232 Elf_Internal_Sym *sym;
2233 asection *sec;
2234 bfd_vma off;
2235 bfd_vma relocation;
2236 bfd_boolean unresolved_reloc;
2237 bfd_reloc_status_type r;
2238 int tls_type;
2239
2240 r_type = ELF64_R_TYPE (rel->r_info);
2241 if (r_type == (int) R_390_GNU_VTINHERIT
2242 || r_type == (int) R_390_GNU_VTENTRY)
2243 continue;
2244 if (r_type >= (int) R_390_max)
2245 {
2246 bfd_set_error (bfd_error_bad_value);
2247 return FALSE;
2248 }
2249
2250 howto = elf_howto_table + r_type;
2251 r_symndx = ELF64_R_SYM (rel->r_info);
2252
2253 h = NULL;
2254 sym = NULL;
2255 sec = NULL;
2256 unresolved_reloc = FALSE;
2257 if (r_symndx < symtab_hdr->sh_info)
2258 {
2259 sym = local_syms + r_symndx;
2260 sec = local_sections[r_symndx];
2261 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2262 }
2263 else
2264 {
2265 bfd_boolean warned ATTRIBUTE_UNUSED;
2266
2267 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2268 r_symndx, symtab_hdr, sym_hashes,
2269 h, sec, relocation,
2270 unresolved_reloc, warned);
2271 }
2272
2273 if (sec != NULL && elf_discarded_section (sec))
2274 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2275 rel, relend, howto, contents);
2276
2277 if (info->relocatable)
2278 continue;
2279
2280 switch (r_type)
2281 {
2282 case R_390_GOTPLT12:
2283 case R_390_GOTPLT16:
2284 case R_390_GOTPLT20:
2285 case R_390_GOTPLT32:
2286 case R_390_GOTPLT64:
2287 case R_390_GOTPLTENT:
2288 /* There are three cases for a GOTPLT relocation. 1) The
2289 relocation is against the jump slot entry of a plt that
2290 will get emitted to the output file. 2) The relocation
2291 is against the jump slot of a plt entry that has been
2292 removed. elf_s390_adjust_gotplt has created a GOT entry
2293 as replacement. 3) The relocation is against a local symbol.
2294 Cases 2) and 3) are the same as the GOT relocation code
2295 so we just have to test for case 1 and fall through for
2296 the other two. */
2297 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2298 {
2299 bfd_vma plt_index;
2300
2301 /* Calc. index no.
2302 Current offset - size first entry / entry size. */
2303 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2304 PLT_ENTRY_SIZE;
2305
2306 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2307 addr & GOT addr. */
2308 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2309 unresolved_reloc = FALSE;
2310
2311 if (r_type == R_390_GOTPLTENT)
2312 relocation += htab->sgot->output_section->vma;
2313 break;
2314 }
2315 /* Fall through. */
2316
2317 case R_390_GOT12:
2318 case R_390_GOT16:
2319 case R_390_GOT20:
2320 case R_390_GOT32:
2321 case R_390_GOT64:
2322 case R_390_GOTENT:
2323 /* Relocation is to the entry for this symbol in the global
2324 offset table. */
2325 if (htab->sgot == NULL)
2326 abort ();
2327
2328 if (h != NULL)
2329 {
2330 bfd_boolean dyn;
2331
2332 off = h->got.offset;
2333 dyn = htab->elf.dynamic_sections_created;
2334 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2335 || (info->shared
2336 && SYMBOL_REFERENCES_LOCAL (info, h))
2337 || (ELF_ST_VISIBILITY (h->other)
2338 && h->root.type == bfd_link_hash_undefweak))
2339 {
2340 /* This is actually a static link, or it is a
2341 -Bsymbolic link and the symbol is defined
2342 locally, or the symbol was forced to be local
2343 because of a version file. We must initialize
2344 this entry in the global offset table. Since the
2345 offset must always be a multiple of 2, we use the
2346 least significant bit to record whether we have
2347 initialized it already.
2348
2349 When doing a dynamic link, we create a .rel.got
2350 relocation entry to initialize the value. This
2351 is done in the finish_dynamic_symbol routine. */
2352 if ((off & 1) != 0)
2353 off &= ~1;
2354 else
2355 {
2356 bfd_put_64 (output_bfd, relocation,
2357 htab->sgot->contents + off);
2358 h->got.offset |= 1;
2359 }
2360 }
2361 else
2362 unresolved_reloc = FALSE;
2363 }
2364 else
2365 {
2366 if (local_got_offsets == NULL)
2367 abort ();
2368
2369 off = local_got_offsets[r_symndx];
2370
2371 /* The offset must always be a multiple of 8. We use
2372 the least significant bit to record whether we have
2373 already generated the necessary reloc. */
2374 if ((off & 1) != 0)
2375 off &= ~1;
2376 else
2377 {
2378 bfd_put_64 (output_bfd, relocation,
2379 htab->sgot->contents + off);
2380
2381 if (info->shared)
2382 {
2383 asection *s;
2384 Elf_Internal_Rela outrel;
2385 bfd_byte *loc;
2386
2387 s = htab->srelgot;
2388 if (s == NULL)
2389 abort ();
2390
2391 outrel.r_offset = (htab->sgot->output_section->vma
2392 + htab->sgot->output_offset
2393 + off);
2394 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2395 outrel.r_addend = relocation;
2396 loc = s->contents;
2397 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2398 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2399 }
2400
2401 local_got_offsets[r_symndx] |= 1;
2402 }
2403 }
2404
2405 if (off >= (bfd_vma) -2)
2406 abort ();
2407
2408 relocation = htab->sgot->output_offset + off;
2409
2410 /* For @GOTENT the relocation is against the offset between
2411 the instruction and the symbols entry in the GOT and not
2412 between the start of the GOT and the symbols entry. We
2413 add the vma of the GOT to get the correct value. */
2414 if ( r_type == R_390_GOTENT
2415 || r_type == R_390_GOTPLTENT)
2416 relocation += htab->sgot->output_section->vma;
2417
2418 break;
2419
2420 case R_390_GOTOFF16:
2421 case R_390_GOTOFF32:
2422 case R_390_GOTOFF64:
2423 /* Relocation is relative to the start of the global offset
2424 table. */
2425
2426 /* Note that sgot->output_offset is not involved in this
2427 calculation. We always want the start of .got. If we
2428 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2429 permitted by the ABI, we might have to change this
2430 calculation. */
2431 relocation -= htab->sgot->output_section->vma;
2432 break;
2433
2434 case R_390_GOTPC:
2435 case R_390_GOTPCDBL:
2436 /* Use global offset table as symbol value. */
2437 relocation = htab->sgot->output_section->vma;
2438 unresolved_reloc = FALSE;
2439 break;
2440
2441 case R_390_PLT16DBL:
2442 case R_390_PLT32:
2443 case R_390_PLT32DBL:
2444 case R_390_PLT64:
2445 /* Relocation is to the entry for this symbol in the
2446 procedure linkage table. */
2447
2448 /* Resolve a PLT32 reloc against a local symbol directly,
2449 without using the procedure linkage table. */
2450 if (h == NULL)
2451 break;
2452
2453 if (h->plt.offset == (bfd_vma) -1
2454 || htab->splt == NULL)
2455 {
2456 /* We didn't make a PLT entry for this symbol. This
2457 happens when statically linking PIC code, or when
2458 using -Bsymbolic. */
2459 break;
2460 }
2461
2462 relocation = (htab->splt->output_section->vma
2463 + htab->splt->output_offset
2464 + h->plt.offset);
2465 unresolved_reloc = FALSE;
2466 break;
2467
2468 case R_390_PLTOFF16:
2469 case R_390_PLTOFF32:
2470 case R_390_PLTOFF64:
2471 /* Relocation is to the entry for this symbol in the
2472 procedure linkage table relative to the start of the GOT. */
2473
2474 /* For local symbols or if we didn't make a PLT entry for
2475 this symbol resolve the symbol directly. */
2476 if ( h == NULL
2477 || h->plt.offset == (bfd_vma) -1
2478 || htab->splt == NULL)
2479 {
2480 relocation -= htab->sgot->output_section->vma;
2481 break;
2482 }
2483
2484 relocation = (htab->splt->output_section->vma
2485 + htab->splt->output_offset
2486 + h->plt.offset
2487 - htab->sgot->output_section->vma);
2488 unresolved_reloc = FALSE;
2489 break;
2490
2491 case R_390_8:
2492 case R_390_16:
2493 case R_390_32:
2494 case R_390_64:
2495 case R_390_PC16:
2496 case R_390_PC16DBL:
2497 case R_390_PC32:
2498 case R_390_PC32DBL:
2499 case R_390_PC64:
2500 if ((input_section->flags & SEC_ALLOC) == 0)
2501 break;
2502
2503 if ((info->shared
2504 && (h == NULL
2505 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2506 || h->root.type != bfd_link_hash_undefweak)
2507 && ((r_type != R_390_PC16
2508 && r_type != R_390_PC16DBL
2509 && r_type != R_390_PC32
2510 && r_type != R_390_PC32DBL
2511 && r_type != R_390_PC64)
2512 || !SYMBOL_CALLS_LOCAL (info, h)))
2513 || (ELIMINATE_COPY_RELOCS
2514 && !info->shared
2515 && h != NULL
2516 && h->dynindx != -1
2517 && !h->non_got_ref
2518 && ((h->def_dynamic
2519 && !h->def_regular)
2520 || h->root.type == bfd_link_hash_undefweak
2521 || h->root.type == bfd_link_hash_undefined)))
2522 {
2523 Elf_Internal_Rela outrel;
2524 bfd_boolean skip, relocate;
2525 asection *sreloc;
2526 bfd_byte *loc;
2527
2528 /* When generating a shared object, these relocations
2529 are copied into the output file to be resolved at run
2530 time. */
2531 skip = FALSE;
2532 relocate = FALSE;
2533
2534 outrel.r_offset =
2535 _bfd_elf_section_offset (output_bfd, info, input_section,
2536 rel->r_offset);
2537 if (outrel.r_offset == (bfd_vma) -1)
2538 skip = TRUE;
2539 else if (outrel.r_offset == (bfd_vma) -2)
2540 skip = TRUE, relocate = TRUE;
2541
2542 outrel.r_offset += (input_section->output_section->vma
2543 + input_section->output_offset);
2544
2545 if (skip)
2546 memset (&outrel, 0, sizeof outrel);
2547 else if (h != NULL
2548 && h->dynindx != -1
2549 && (r_type == R_390_PC16
2550 || r_type == R_390_PC16DBL
2551 || r_type == R_390_PC32
2552 || r_type == R_390_PC32DBL
2553 || r_type == R_390_PC64
2554 || !info->shared
2555 || !SYMBOLIC_BIND (info, h)
2556 || !h->def_regular))
2557 {
2558 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2559 outrel.r_addend = rel->r_addend;
2560 }
2561 else
2562 {
2563 /* This symbol is local, or marked to become local. */
2564 outrel.r_addend = relocation + rel->r_addend;
2565 if (r_type == R_390_64)
2566 {
2567 relocate = TRUE;
2568 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2569 }
2570 else
2571 {
2572 long sindx;
2573
2574 if (bfd_is_abs_section (sec))
2575 sindx = 0;
2576 else if (sec == NULL || sec->owner == NULL)
2577 {
2578 bfd_set_error(bfd_error_bad_value);
2579 return FALSE;
2580 }
2581 else
2582 {
2583 asection *osec;
2584
2585 osec = sec->output_section;
2586 sindx = elf_section_data (osec)->dynindx;
2587
2588 if (sindx == 0)
2589 {
2590 osec = htab->elf.text_index_section;
2591 sindx = elf_section_data (osec)->dynindx;
2592 }
2593 BFD_ASSERT (sindx != 0);
2594
2595 /* We are turning this relocation into one
2596 against a section symbol, so subtract out
2597 the output section's address but not the
2598 offset of the input section in the output
2599 section. */
2600 outrel.r_addend -= osec->vma;
2601 }
2602 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2603 }
2604 }
2605
2606 sreloc = elf_section_data (input_section)->sreloc;
2607 if (sreloc == NULL)
2608 abort ();
2609
2610 loc = sreloc->contents;
2611 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2612 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2613
2614 /* If this reloc is against an external symbol, we do
2615 not want to fiddle with the addend. Otherwise, we
2616 need to include the symbol value so that it becomes
2617 an addend for the dynamic reloc. */
2618 if (! relocate)
2619 continue;
2620 }
2621
2622 break;
2623
2624 /* Relocations for tls literal pool entries. */
2625 case R_390_TLS_IE64:
2626 if (info->shared)
2627 {
2628 Elf_Internal_Rela outrel;
2629 asection *sreloc;
2630 bfd_byte *loc;
2631
2632 outrel.r_offset = rel->r_offset
2633 + input_section->output_section->vma
2634 + input_section->output_offset;
2635 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2636 sreloc = elf_section_data (input_section)->sreloc;
2637 if (sreloc == NULL)
2638 abort ();
2639 loc = sreloc->contents;
2640 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2641 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2642 }
2643 /* Fall through. */
2644
2645 case R_390_TLS_GD64:
2646 case R_390_TLS_GOTIE64:
2647 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2648 tls_type = GOT_UNKNOWN;
2649 if (h == NULL && local_got_offsets)
2650 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2651 else if (h != NULL)
2652 {
2653 tls_type = elf_s390_hash_entry(h)->tls_type;
2654 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2655 r_type = R_390_TLS_LE64;
2656 }
2657 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2658 r_type = R_390_TLS_IE64;
2659
2660 if (r_type == R_390_TLS_LE64)
2661 {
2662 /* This relocation gets optimized away by the local exec
2663 access optimization. */
2664 BFD_ASSERT (! unresolved_reloc);
2665 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2666 contents + rel->r_offset);
2667 continue;
2668 }
2669
2670 if (htab->sgot == NULL)
2671 abort ();
2672
2673 if (h != NULL)
2674 off = h->got.offset;
2675 else
2676 {
2677 if (local_got_offsets == NULL)
2678 abort ();
2679
2680 off = local_got_offsets[r_symndx];
2681 }
2682
2683 emit_tls_relocs:
2684
2685 if ((off & 1) != 0)
2686 off &= ~1;
2687 else
2688 {
2689 Elf_Internal_Rela outrel;
2690 bfd_byte *loc;
2691 int dr_type, indx;
2692
2693 if (htab->srelgot == NULL)
2694 abort ();
2695
2696 outrel.r_offset = (htab->sgot->output_section->vma
2697 + htab->sgot->output_offset + off);
2698
2699 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2700 if (r_type == R_390_TLS_GD64)
2701 dr_type = R_390_TLS_DTPMOD;
2702 else
2703 dr_type = R_390_TLS_TPOFF;
2704 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2705 outrel.r_addend = relocation - dtpoff_base (info);
2706 else
2707 outrel.r_addend = 0;
2708 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2709 loc = htab->srelgot->contents;
2710 loc += htab->srelgot->reloc_count++
2711 * sizeof (Elf64_External_Rela);
2712 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2713
2714 if (r_type == R_390_TLS_GD64)
2715 {
2716 if (indx == 0)
2717 {
2718 BFD_ASSERT (! unresolved_reloc);
2719 bfd_put_64 (output_bfd,
2720 relocation - dtpoff_base (info),
2721 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2722 }
2723 else
2724 {
2725 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
2726 outrel.r_offset += GOT_ENTRY_SIZE;
2727 outrel.r_addend = 0;
2728 htab->srelgot->reloc_count++;
2729 loc += sizeof (Elf64_External_Rela);
2730 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2731 }
2732 }
2733
2734 if (h != NULL)
2735 h->got.offset |= 1;
2736 else
2737 local_got_offsets[r_symndx] |= 1;
2738 }
2739
2740 if (off >= (bfd_vma) -2)
2741 abort ();
2742 if (r_type == ELF64_R_TYPE (rel->r_info))
2743 {
2744 relocation = htab->sgot->output_offset + off;
2745 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
2746 relocation += htab->sgot->output_section->vma;
2747 unresolved_reloc = FALSE;
2748 }
2749 else
2750 {
2751 bfd_put_64 (output_bfd, htab->sgot->output_offset + off,
2752 contents + rel->r_offset);
2753 continue;
2754 }
2755 break;
2756
2757 case R_390_TLS_GOTIE12:
2758 case R_390_TLS_GOTIE20:
2759 case R_390_TLS_IEENT:
2760 if (h == NULL)
2761 {
2762 if (local_got_offsets == NULL)
2763 abort();
2764 off = local_got_offsets[r_symndx];
2765 if (info->shared)
2766 goto emit_tls_relocs;
2767 }
2768 else
2769 {
2770 off = h->got.offset;
2771 tls_type = elf_s390_hash_entry(h)->tls_type;
2772 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2773 goto emit_tls_relocs;
2774 }
2775
2776 if (htab->sgot == NULL)
2777 abort ();
2778
2779 BFD_ASSERT (! unresolved_reloc);
2780 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2781 htab->sgot->contents + off);
2782 relocation = htab->sgot->output_offset + off;
2783 if (r_type == R_390_TLS_IEENT)
2784 relocation += htab->sgot->output_section->vma;
2785 unresolved_reloc = FALSE;
2786 break;
2787
2788 case R_390_TLS_LDM64:
2789 if (! info->shared)
2790 /* The literal pool entry this relocation refers to gets ignored
2791 by the optimized code of the local exec model. Do nothing
2792 and the value will turn out zero. */
2793 continue;
2794
2795 if (htab->sgot == NULL)
2796 abort ();
2797
2798 off = htab->tls_ldm_got.offset;
2799 if (off & 1)
2800 off &= ~1;
2801 else
2802 {
2803 Elf_Internal_Rela outrel;
2804 bfd_byte *loc;
2805
2806 if (htab->srelgot == NULL)
2807 abort ();
2808
2809 outrel.r_offset = (htab->sgot->output_section->vma
2810 + htab->sgot->output_offset + off);
2811
2812 bfd_put_64 (output_bfd, 0,
2813 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2814 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
2815 outrel.r_addend = 0;
2816 loc = htab->srelgot->contents;
2817 loc += htab->srelgot->reloc_count++
2818 * sizeof (Elf64_External_Rela);
2819 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2820 htab->tls_ldm_got.offset |= 1;
2821 }
2822 relocation = htab->sgot->output_offset + off;
2823 unresolved_reloc = FALSE;
2824 break;
2825
2826 case R_390_TLS_LE64:
2827 if (info->shared)
2828 {
2829 /* Linking a shared library with non-fpic code requires
2830 a R_390_TLS_TPOFF relocation. */
2831 Elf_Internal_Rela outrel;
2832 asection *sreloc;
2833 bfd_byte *loc;
2834 int indx;
2835
2836 outrel.r_offset = rel->r_offset
2837 + input_section->output_section->vma
2838 + input_section->output_offset;
2839 if (h != NULL && h->dynindx != -1)
2840 indx = h->dynindx;
2841 else
2842 indx = 0;
2843 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
2844 if (indx == 0)
2845 outrel.r_addend = relocation - dtpoff_base (info);
2846 else
2847 outrel.r_addend = 0;
2848 sreloc = elf_section_data (input_section)->sreloc;
2849 if (sreloc == NULL)
2850 abort ();
2851 loc = sreloc->contents;
2852 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2853 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2854 }
2855 else
2856 {
2857 BFD_ASSERT (! unresolved_reloc);
2858 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2859 contents + rel->r_offset);
2860 }
2861 continue;
2862
2863 case R_390_TLS_LDO64:
2864 if (info->shared)
2865 relocation -= dtpoff_base (info);
2866 else
2867 /* When converting LDO to LE, we must negate. */
2868 relocation = -tpoff (info, relocation);
2869 break;
2870
2871 /* Relocations for tls instructions. */
2872 case R_390_TLS_LOAD:
2873 case R_390_TLS_GDCALL:
2874 case R_390_TLS_LDCALL:
2875 tls_type = GOT_UNKNOWN;
2876 if (h == NULL && local_got_offsets)
2877 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2878 else if (h != NULL)
2879 tls_type = elf_s390_hash_entry(h)->tls_type;
2880
2881 if (tls_type == GOT_TLS_GD)
2882 continue;
2883
2884 if (r_type == R_390_TLS_LOAD)
2885 {
2886 if (!info->shared && (h == NULL || h->dynindx == -1))
2887 {
2888 /* IE->LE transition. Four valid cases:
2889 lg %rx,(0,%ry) -> sllg %rx,%ry,0
2890 lg %rx,(%ry,0) -> sllg %rx,%ry,0
2891 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
2892 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
2893 unsigned int insn0, insn1, ry;
2894
2895 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2896 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2897 if (insn1 != 0x0004)
2898 invalid_tls_insn (input_bfd, input_section, rel);
2899 ry = 0;
2900 if ((insn0 & 0xff00f000) == 0xe3000000)
2901 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
2902 ry = (insn0 & 0x000f0000);
2903 else if ((insn0 & 0xff0f0000) == 0xe3000000)
2904 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
2905 ry = (insn0 & 0x0000f000) << 4;
2906 else if ((insn0 & 0xff00f000) == 0xe300c000)
2907 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
2908 ry = (insn0 & 0x000f0000);
2909 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
2910 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
2911 ry = (insn0 & 0x0000f000) << 4;
2912 else
2913 invalid_tls_insn (input_bfd, input_section, rel);
2914 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
2915 insn1 = 0x000d;
2916 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2917 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2918 }
2919 }
2920 else if (r_type == R_390_TLS_GDCALL)
2921 {
2922 unsigned int insn0, insn1;
2923
2924 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2925 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2926 if ((insn0 & 0xffff0000) != 0xc0e50000)
2927 invalid_tls_insn (input_bfd, input_section, rel);
2928 if (!info->shared && (h == NULL || h->dynindx == -1))
2929 {
2930 /* GD->LE transition.
2931 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2932 insn0 = 0xc0040000;
2933 insn1 = 0x0000;
2934 }
2935 else
2936 {
2937 /* GD->IE transition.
2938 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
2939 insn0 = 0xe322c000;
2940 insn1 = 0x0004;
2941 }
2942 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2943 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2944 }
2945 else if (r_type == R_390_TLS_LDCALL)
2946 {
2947 if (!info->shared)
2948 {
2949 unsigned int insn0, insn1;
2950
2951 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2952 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2953 if ((insn0 & 0xffff0000) != 0xc0e50000)
2954 invalid_tls_insn (input_bfd, input_section, rel);
2955 /* LD->LE transition.
2956 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2957 insn0 = 0xc0040000;
2958 insn1 = 0x0000;
2959 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2960 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2961 }
2962 }
2963 continue;
2964
2965 default:
2966 break;
2967 }
2968
2969 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2970 because such sections are not SEC_ALLOC and thus ld.so will
2971 not process them. */
2972 if (unresolved_reloc
2973 && !((input_section->flags & SEC_DEBUGGING) != 0
2974 && h->def_dynamic))
2975 (*_bfd_error_handler)
2976 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
2977 input_bfd,
2978 input_section,
2979 (long) rel->r_offset,
2980 howto->name,
2981 h->root.root.string);
2982
2983 if (r_type == R_390_20
2984 || r_type == R_390_GOT20
2985 || r_type == R_390_GOTPLT20
2986 || r_type == R_390_TLS_GOTIE20)
2987 {
2988 relocation += rel->r_addend;
2989 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
2990 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
2991 contents, rel->r_offset,
2992 relocation, 0);
2993 }
2994 else
2995 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
2996 contents, rel->r_offset,
2997 relocation, rel->r_addend);
2998
2999 if (r != bfd_reloc_ok)
3000 {
3001 const char *name;
3002
3003 if (h != NULL)
3004 name = h->root.root.string;
3005 else
3006 {
3007 name = bfd_elf_string_from_elf_section (input_bfd,
3008 symtab_hdr->sh_link,
3009 sym->st_name);
3010 if (name == NULL)
3011 return FALSE;
3012 if (*name == '\0')
3013 name = bfd_section_name (input_bfd, sec);
3014 }
3015
3016 if (r == bfd_reloc_overflow)
3017 {
3018
3019 if (! ((*info->callbacks->reloc_overflow)
3020 (info, (h ? &h->root : NULL), name, howto->name,
3021 (bfd_vma) 0, input_bfd, input_section,
3022 rel->r_offset)))
3023 return FALSE;
3024 }
3025 else
3026 {
3027 (*_bfd_error_handler)
3028 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3029 input_bfd, input_section,
3030 (long) rel->r_offset, name, (int) r);
3031 return FALSE;
3032 }
3033 }
3034 }
3035
3036 return TRUE;
3037 }
3038
3039 /* Finish up dynamic symbol handling. We set the contents of various
3040 dynamic sections here. */
3041
3042 static bfd_boolean
3043 elf_s390_finish_dynamic_symbol (bfd *output_bfd,
3044 struct bfd_link_info *info,
3045 struct elf_link_hash_entry *h,
3046 Elf_Internal_Sym *sym)
3047 {
3048 struct elf_s390_link_hash_table *htab;
3049
3050 htab = elf_s390_hash_table (info);
3051 if (htab == NULL)
3052 return FALSE;
3053
3054 if (h->plt.offset != (bfd_vma) -1)
3055 {
3056 bfd_vma plt_index;
3057 bfd_vma got_offset;
3058 Elf_Internal_Rela rela;
3059 bfd_byte *loc;
3060
3061 /* This symbol has an entry in the procedure linkage table. Set
3062 it up. */
3063
3064 if (h->dynindx == -1
3065 || htab->splt == NULL
3066 || htab->sgotplt == NULL
3067 || htab->srelplt == NULL)
3068 abort ();
3069
3070 /* Calc. index no.
3071 Current offset - size first entry / entry size. */
3072 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3073
3074 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
3075 addr & GOT addr. */
3076 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3077
3078 /* Fill in the blueprint of a PLT. */
3079 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3080 htab->splt->contents + h->plt.offset);
3081 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3082 htab->splt->contents + h->plt.offset + 4);
3083 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3084 htab->splt->contents + h->plt.offset + 8);
3085 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3086 htab->splt->contents + h->plt.offset + 12);
3087 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3088 htab->splt->contents + h->plt.offset + 16);
3089 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5,
3090 htab->splt->contents + h->plt.offset + 20);
3091 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6,
3092 htab->splt->contents + h->plt.offset + 24);
3093 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7,
3094 htab->splt->contents + h->plt.offset + 28);
3095 /* Fixup the relative address to the GOT entry */
3096 bfd_put_32 (output_bfd,
3097 (htab->sgotplt->output_section->vma +
3098 htab->sgotplt->output_offset + got_offset
3099 - (htab->splt->output_section->vma + h->plt.offset))/2,
3100 htab->splt->contents + h->plt.offset + 2);
3101 /* Fixup the relative branch to PLT 0 */
3102 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3103 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3104 htab->splt->contents + h->plt.offset + 24);
3105 /* Fixup offset into symbol table */
3106 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3107 htab->splt->contents + h->plt.offset + 28);
3108
3109 /* Fill in the entry in the global offset table.
3110 Points to instruction after GOT offset. */
3111 bfd_put_64 (output_bfd,
3112 (htab->splt->output_section->vma
3113 + htab->splt->output_offset
3114 + h->plt.offset
3115 + 14),
3116 htab->sgotplt->contents + got_offset);
3117
3118 /* Fill in the entry in the .rela.plt section. */
3119 rela.r_offset = (htab->sgotplt->output_section->vma
3120 + htab->sgotplt->output_offset
3121 + got_offset);
3122 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3123 rela.r_addend = 0;
3124 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela);
3125 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3126
3127 if (!h->def_regular)
3128 {
3129 /* Mark the symbol as undefined, rather than as defined in
3130 the .plt section. Leave the value alone. This is a clue
3131 for the dynamic linker, to make function pointer
3132 comparisons work between an application and shared
3133 library. */
3134 sym->st_shndx = SHN_UNDEF;
3135 }
3136 }
3137
3138 if (h->got.offset != (bfd_vma) -1
3139 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3140 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3141 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3142 {
3143 Elf_Internal_Rela rela;
3144 bfd_byte *loc;
3145
3146 /* This symbol has an entry in the global offset table. Set it
3147 up. */
3148 if (htab->sgot == NULL || htab->srelgot == NULL)
3149 abort ();
3150
3151 rela.r_offset = (htab->sgot->output_section->vma
3152 + htab->sgot->output_offset
3153 + (h->got.offset &~ (bfd_vma) 1));
3154
3155 /* If this is a static link, or it is a -Bsymbolic link and the
3156 symbol is defined locally or was forced to be local because
3157 of a version file, we just want to emit a RELATIVE reloc.
3158 The entry in the global offset table will already have been
3159 initialized in the relocate_section function. */
3160 if (info->shared
3161 && SYMBOL_REFERENCES_LOCAL (info, h))
3162 {
3163 if (!h->def_regular)
3164 return FALSE;
3165 BFD_ASSERT((h->got.offset & 1) != 0);
3166 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3167 rela.r_addend = (h->root.u.def.value
3168 + h->root.u.def.section->output_section->vma
3169 + h->root.u.def.section->output_offset);
3170 }
3171 else
3172 {
3173 BFD_ASSERT((h->got.offset & 1) == 0);
3174 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3175 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3176 rela.r_addend = 0;
3177 }
3178
3179 loc = htab->srelgot->contents;
3180 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3181 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3182 }
3183
3184 if (h->needs_copy)
3185 {
3186 Elf_Internal_Rela rela;
3187 bfd_byte *loc;
3188
3189 /* This symbols needs a copy reloc. Set it up. */
3190
3191 if (h->dynindx == -1
3192 || (h->root.type != bfd_link_hash_defined
3193 && h->root.type != bfd_link_hash_defweak)
3194 || htab->srelbss == NULL)
3195 abort ();
3196
3197 rela.r_offset = (h->root.u.def.value
3198 + h->root.u.def.section->output_section->vma
3199 + h->root.u.def.section->output_offset);
3200 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3201 rela.r_addend = 0;
3202 loc = htab->srelbss->contents;
3203 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3204 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3205 }
3206
3207 /* Mark some specially defined symbols as absolute. */
3208 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3209 || h == htab->elf.hgot
3210 || h == htab->elf.hplt)
3211 sym->st_shndx = SHN_ABS;
3212
3213 return TRUE;
3214 }
3215
3216 /* Used to decide how to sort relocs in an optimal manner for the
3217 dynamic linker, before writing them out. */
3218
3219 static enum elf_reloc_type_class
3220 elf_s390_reloc_type_class (rela)
3221 const Elf_Internal_Rela *rela;
3222 {
3223 switch ((int) ELF64_R_TYPE (rela->r_info))
3224 {
3225 case R_390_RELATIVE:
3226 return reloc_class_relative;
3227 case R_390_JMP_SLOT:
3228 return reloc_class_plt;
3229 case R_390_COPY:
3230 return reloc_class_copy;
3231 default:
3232 return reloc_class_normal;
3233 }
3234 }
3235
3236 /* Finish up the dynamic sections. */
3237
3238 static bfd_boolean
3239 elf_s390_finish_dynamic_sections (bfd *output_bfd,
3240 struct bfd_link_info *info)
3241 {
3242 struct elf_s390_link_hash_table *htab;
3243 bfd *dynobj;
3244 asection *sdyn;
3245
3246 htab = elf_s390_hash_table (info);
3247 if (htab == NULL)
3248 return FALSE;
3249
3250 dynobj = htab->elf.dynobj;
3251 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3252
3253 if (htab->elf.dynamic_sections_created)
3254 {
3255 Elf64_External_Dyn *dyncon, *dynconend;
3256
3257 if (sdyn == NULL || htab->sgot == NULL)
3258 abort ();
3259
3260 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3261 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3262 for (; dyncon < dynconend; dyncon++)
3263 {
3264 Elf_Internal_Dyn dyn;
3265 asection *s;
3266
3267 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3268
3269 switch (dyn.d_tag)
3270 {
3271 default:
3272 continue;
3273
3274 case DT_PLTGOT:
3275 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3276 break;
3277
3278 case DT_JMPREL:
3279 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3280 break;
3281
3282 case DT_PLTRELSZ:
3283 s = htab->srelplt->output_section;
3284 dyn.d_un.d_val = s->size;
3285 break;
3286
3287 case DT_RELASZ:
3288 /* The procedure linkage table relocs (DT_JMPREL) should
3289 not be included in the overall relocs (DT_RELA).
3290 Therefore, we override the DT_RELASZ entry here to
3291 make it not include the JMPREL relocs. Since the
3292 linker script arranges for .rela.plt to follow all
3293 other relocation sections, we don't have to worry
3294 about changing the DT_RELA entry. */
3295 s = htab->srelplt->output_section;
3296 dyn.d_un.d_val -= s->size;
3297 break;
3298 }
3299
3300 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3301 }
3302
3303 /* Fill in the special first entry in the procedure linkage table. */
3304 if (htab->splt && htab->splt->size > 0)
3305 {
3306 /* fill in blueprint for plt 0 entry */
3307 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0,
3308 htab->splt->contents );
3309 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3310 htab->splt->contents +4 );
3311 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3312 htab->splt->contents +12 );
3313 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3314 htab->splt->contents +16 );
3315 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3316 htab->splt->contents +20 );
3317 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6,
3318 htab->splt->contents + 24);
3319 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7,
3320 htab->splt->contents + 28 );
3321 /* Fixup relative address to start of GOT */
3322 bfd_put_32 (output_bfd,
3323 (htab->sgotplt->output_section->vma +
3324 htab->sgotplt->output_offset
3325 - htab->splt->output_section->vma - 6)/2,
3326 htab->splt->contents + 8);
3327 }
3328 elf_section_data (htab->splt->output_section)
3329 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE;
3330 }
3331
3332 if (htab->sgotplt)
3333 {
3334 /* Fill in the first three entries in the global offset table. */
3335 if (htab->sgotplt->size > 0)
3336 {
3337 bfd_put_64 (output_bfd,
3338 (sdyn == NULL ? (bfd_vma) 0
3339 : sdyn->output_section->vma + sdyn->output_offset),
3340 htab->sgotplt->contents);
3341 /* One entry for shared object struct ptr. */
3342 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3343 /* One entry for _dl_runtime_resolve. */
3344 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12);
3345 }
3346
3347 elf_section_data (htab->sgot->output_section)
3348 ->this_hdr.sh_entsize = 8;
3349 }
3350 return TRUE;
3351 }
3352
3353 /* Return address for Ith PLT stub in section PLT, for relocation REL
3354 or (bfd_vma) -1 if it should not be included. */
3355
3356 static bfd_vma
3357 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3358 const arelent *rel ATTRIBUTE_UNUSED)
3359 {
3360 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3361 }
3362
3363
3364 /* Why was the hash table entry size definition changed from
3365 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3366 this is the only reason for the s390_elf64_size_info structure. */
3367
3368 const struct elf_size_info s390_elf64_size_info =
3369 {
3370 sizeof (Elf64_External_Ehdr),
3371 sizeof (Elf64_External_Phdr),
3372 sizeof (Elf64_External_Shdr),
3373 sizeof (Elf64_External_Rel),
3374 sizeof (Elf64_External_Rela),
3375 sizeof (Elf64_External_Sym),
3376 sizeof (Elf64_External_Dyn),
3377 sizeof (Elf_External_Note),
3378 8, /* hash-table entry size. */
3379 1, /* internal relocations per external relocations. */
3380 64, /* arch_size. */
3381 3, /* log_file_align. */
3382 ELFCLASS64, EV_CURRENT,
3383 bfd_elf64_write_out_phdrs,
3384 bfd_elf64_write_shdrs_and_ehdr,
3385 bfd_elf64_checksum_contents,
3386 bfd_elf64_write_relocs,
3387 bfd_elf64_swap_symbol_in,
3388 bfd_elf64_swap_symbol_out,
3389 bfd_elf64_slurp_reloc_table,
3390 bfd_elf64_slurp_symbol_table,
3391 bfd_elf64_swap_dyn_in,
3392 bfd_elf64_swap_dyn_out,
3393 bfd_elf64_swap_reloc_in,
3394 bfd_elf64_swap_reloc_out,
3395 bfd_elf64_swap_reloca_in,
3396 bfd_elf64_swap_reloca_out
3397 };
3398
3399 #define TARGET_BIG_SYM bfd_elf64_s390_vec
3400 #define TARGET_BIG_NAME "elf64-s390"
3401 #define ELF_ARCH bfd_arch_s390
3402 #define ELF_TARGET_ID S390_ELF_DATA
3403 #define ELF_MACHINE_CODE EM_S390
3404 #define ELF_MACHINE_ALT1 EM_S390_OLD
3405 #define ELF_MAXPAGESIZE 0x1000
3406
3407 #define elf_backend_size_info s390_elf64_size_info
3408
3409 #define elf_backend_can_gc_sections 1
3410 #define elf_backend_can_refcount 1
3411 #define elf_backend_want_got_plt 1
3412 #define elf_backend_plt_readonly 1
3413 #define elf_backend_want_plt_sym 0
3414 #define elf_backend_got_header_size 24
3415 #define elf_backend_rela_normal 1
3416
3417 #define elf_info_to_howto elf_s390_info_to_howto
3418
3419 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3420 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3421 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3422 #define bfd_elf64_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
3423
3424 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3425 #define elf_backend_check_relocs elf_s390_check_relocs
3426 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3427 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3428 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3429 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3430 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3431 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3432 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3433 #define elf_backend_relocate_section elf_s390_relocate_section
3434 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3435 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3436 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3437 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3438
3439 #define bfd_elf64_mkobject elf_s390_mkobject
3440 #define elf_backend_object_p elf_s390_object_p
3441
3442 #include "elf64-target.h"
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