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[deliverable/binutils-gdb.git] / bfd / elf64-s390.c
1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005
3 Free Software Foundation, Inc.
4 Contributed Martin Schwidefsky (schwidefsky@de.ibm.com).
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23 #include "bfd.h"
24 #include "sysdep.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28
29 static reloc_howto_type *elf_s390_reloc_type_lookup
30 PARAMS ((bfd *, bfd_reloc_code_real_type));
31 static void elf_s390_info_to_howto
32 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
33 static bfd_boolean elf_s390_is_local_label_name
34 PARAMS ((bfd *, const char *));
35 static struct bfd_hash_entry *link_hash_newfunc
36 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
37 static struct bfd_link_hash_table *elf_s390_link_hash_table_create
38 PARAMS ((bfd *));
39 static bfd_boolean create_got_section
40 PARAMS((bfd *, struct bfd_link_info *));
41 static bfd_boolean elf_s390_create_dynamic_sections
42 PARAMS((bfd *, struct bfd_link_info *));
43 static void elf_s390_copy_indirect_symbol
44 PARAMS ((const struct elf_backend_data *, struct elf_link_hash_entry *,
45 struct elf_link_hash_entry *));
46 static bfd_boolean elf_s390_check_relocs
47 PARAMS ((bfd *, struct bfd_link_info *, asection *,
48 const Elf_Internal_Rela *));
49 static asection *elf_s390_gc_mark_hook
50 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
51 struct elf_link_hash_entry *, Elf_Internal_Sym *));
52 static bfd_boolean elf_s390_gc_sweep_hook
53 PARAMS ((bfd *, struct bfd_link_info *, asection *,
54 const Elf_Internal_Rela *));
55 struct elf_s390_link_hash_entry;
56 static void elf_s390_adjust_gotplt
57 PARAMS ((struct elf_s390_link_hash_entry *));
58 static bfd_boolean elf_s390_adjust_dynamic_symbol
59 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
60 static bfd_boolean allocate_dynrelocs
61 PARAMS ((struct elf_link_hash_entry *, PTR));
62 static bfd_boolean readonly_dynrelocs
63 PARAMS ((struct elf_link_hash_entry *, PTR));
64 static bfd_boolean elf_s390_size_dynamic_sections
65 PARAMS ((bfd *, struct bfd_link_info *));
66 static bfd_boolean elf_s390_relocate_section
67 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
68 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
69 static bfd_boolean elf_s390_finish_dynamic_symbol
70 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
71 Elf_Internal_Sym *));
72 static enum elf_reloc_type_class elf_s390_reloc_type_class
73 PARAMS ((const Elf_Internal_Rela *));
74 static bfd_boolean elf_s390_finish_dynamic_sections
75 PARAMS ((bfd *, struct bfd_link_info *));
76 static bfd_boolean elf_s390_mkobject
77 PARAMS ((bfd *));
78 static bfd_boolean elf_s390_object_p
79 PARAMS ((bfd *));
80 static int elf_s390_tls_transition
81 PARAMS ((struct bfd_link_info *, int, int));
82 static bfd_reloc_status_type s390_tls_reloc
83 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
84 static bfd_vma dtpoff_base
85 PARAMS ((struct bfd_link_info *));
86 static bfd_vma tpoff
87 PARAMS ((struct bfd_link_info *, bfd_vma));
88 static void invalid_tls_insn
89 PARAMS ((bfd *, asection *, Elf_Internal_Rela *));
90 static bfd_reloc_status_type s390_elf_ldisp_reloc
91 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
92
93 #include "elf/s390.h"
94
95 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
96 from smaller values. Start with zero, widen, *then* decrement. */
97 #define MINUS_ONE (((bfd_vma)0) - 1)
98
99 /* The relocation "howto" table. */
100 static reloc_howto_type elf_howto_table[] =
101 {
102 HOWTO (R_390_NONE, /* type */
103 0, /* rightshift */
104 0, /* size (0 = byte, 1 = short, 2 = long) */
105 0, /* bitsize */
106 FALSE, /* pc_relative */
107 0, /* bitpos */
108 complain_overflow_dont, /* complain_on_overflow */
109 bfd_elf_generic_reloc, /* special_function */
110 "R_390_NONE", /* name */
111 FALSE, /* partial_inplace */
112 0, /* src_mask */
113 0, /* dst_mask */
114 FALSE), /* pcrel_offset */
115
116 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
118 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
119 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
120 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
122 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
124 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
126 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
128 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
130 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
132 HOWTO(R_390_COPY, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,MINUS_ONE, FALSE),
134 HOWTO(R_390_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
135 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,MINUS_ONE, FALSE),
136 HOWTO(R_390_JMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
137 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,MINUS_ONE, FALSE),
138 HOWTO(R_390_RELATIVE, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,MINUS_ONE, FALSE),
140 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,MINUS_ONE, FALSE),
142 HOWTO(R_390_GOTPC, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
143 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,MINUS_ONE, TRUE),
144 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
146 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
148 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
150 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
152 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
153 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
154 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
155 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
156 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
157 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,MINUS_ONE, TRUE),
158 HOWTO(R_390_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
159 bfd_elf_generic_reloc, "R_390_64", FALSE, 0,MINUS_ONE, FALSE),
160 HOWTO(R_390_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
161 bfd_elf_generic_reloc, "R_390_PC64", FALSE, 0,MINUS_ONE, TRUE),
162 HOWTO(R_390_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
163 bfd_elf_generic_reloc, "R_390_GOT64", FALSE, 0,MINUS_ONE, FALSE),
164 HOWTO(R_390_PLT64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
165 bfd_elf_generic_reloc, "R_390_PLT64", FALSE, 0,MINUS_ONE, TRUE),
166 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
167 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,MINUS_ONE, TRUE),
168 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
169 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
170 HOWTO(R_390_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
171 bfd_elf_generic_reloc, "R_390_GOTOFF64", FALSE, 0,MINUS_ONE, FALSE),
172 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
173 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
174 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
175 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
176 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
177 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
178 HOWTO(R_390_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
179 bfd_elf_generic_reloc, "R_390_GOTPLT64", FALSE, 0,MINUS_ONE, FALSE),
180 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
181 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,MINUS_ONE, TRUE),
182 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
183 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
184 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
185 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
186 HOWTO(R_390_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
187 bfd_elf_generic_reloc, "R_390_PLTOFF64", FALSE, 0,MINUS_ONE, FALSE),
188 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont,
189 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE),
190 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
191 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE),
192 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
193 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE),
194 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */
195 HOWTO(R_390_TLS_GD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
196 bfd_elf_generic_reloc, "R_390_TLS_GD64", FALSE, 0, MINUS_ONE, FALSE),
197 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
198 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE),
199 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */
200 HOWTO(R_390_TLS_GOTIE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
201 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", FALSE, 0, MINUS_ONE, FALSE),
202 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */
203 HOWTO(R_390_TLS_LDM64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
204 bfd_elf_generic_reloc, "R_390_TLS_LDM64", FALSE, 0, MINUS_ONE, FALSE),
205 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */
206 HOWTO(R_390_TLS_IE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
207 bfd_elf_generic_reloc, "R_390_TLS_IE64", FALSE, 0, MINUS_ONE, FALSE),
208 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
209 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, MINUS_ONE, TRUE),
210 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */
211 HOWTO(R_390_TLS_LE64, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
212 bfd_elf_generic_reloc, "R_390_TLS_LE64", FALSE, 0, MINUS_ONE, FALSE),
213 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */
214 HOWTO(R_390_TLS_LDO64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
215 bfd_elf_generic_reloc, "R_390_TLS_LDO64", FALSE, 0, MINUS_ONE, FALSE),
216 HOWTO(R_390_TLS_DTPMOD, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
217 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, MINUS_ONE, FALSE),
218 HOWTO(R_390_TLS_DTPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
219 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, MINUS_ONE, FALSE),
220 HOWTO(R_390_TLS_TPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
221 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, MINUS_ONE, FALSE),
222 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
223 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE),
224 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
225 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE),
226 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
227 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE),
228 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
229 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE),
230 };
231
232 /* GNU extension to record C++ vtable hierarchy. */
233 static reloc_howto_type elf64_s390_vtinherit_howto =
234 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
235 static reloc_howto_type elf64_s390_vtentry_howto =
236 HOWTO (R_390_GNU_VTENTRY, 0,4,0,FALSE,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", FALSE,0,0, FALSE);
237
238 static reloc_howto_type *
239 elf_s390_reloc_type_lookup (abfd, code)
240 bfd *abfd ATTRIBUTE_UNUSED;
241 bfd_reloc_code_real_type code;
242 {
243 switch (code)
244 {
245 case BFD_RELOC_NONE:
246 return &elf_howto_table[(int) R_390_NONE];
247 case BFD_RELOC_8:
248 return &elf_howto_table[(int) R_390_8];
249 case BFD_RELOC_390_12:
250 return &elf_howto_table[(int) R_390_12];
251 case BFD_RELOC_16:
252 return &elf_howto_table[(int) R_390_16];
253 case BFD_RELOC_32:
254 return &elf_howto_table[(int) R_390_32];
255 case BFD_RELOC_CTOR:
256 return &elf_howto_table[(int) R_390_32];
257 case BFD_RELOC_32_PCREL:
258 return &elf_howto_table[(int) R_390_PC32];
259 case BFD_RELOC_390_GOT12:
260 return &elf_howto_table[(int) R_390_GOT12];
261 case BFD_RELOC_32_GOT_PCREL:
262 return &elf_howto_table[(int) R_390_GOT32];
263 case BFD_RELOC_390_PLT32:
264 return &elf_howto_table[(int) R_390_PLT32];
265 case BFD_RELOC_390_COPY:
266 return &elf_howto_table[(int) R_390_COPY];
267 case BFD_RELOC_390_GLOB_DAT:
268 return &elf_howto_table[(int) R_390_GLOB_DAT];
269 case BFD_RELOC_390_JMP_SLOT:
270 return &elf_howto_table[(int) R_390_JMP_SLOT];
271 case BFD_RELOC_390_RELATIVE:
272 return &elf_howto_table[(int) R_390_RELATIVE];
273 case BFD_RELOC_32_GOTOFF:
274 return &elf_howto_table[(int) R_390_GOTOFF32];
275 case BFD_RELOC_390_GOTPC:
276 return &elf_howto_table[(int) R_390_GOTPC];
277 case BFD_RELOC_390_GOT16:
278 return &elf_howto_table[(int) R_390_GOT16];
279 case BFD_RELOC_16_PCREL:
280 return &elf_howto_table[(int) R_390_PC16];
281 case BFD_RELOC_390_PC16DBL:
282 return &elf_howto_table[(int) R_390_PC16DBL];
283 case BFD_RELOC_390_PLT16DBL:
284 return &elf_howto_table[(int) R_390_PLT16DBL];
285 case BFD_RELOC_390_PC32DBL:
286 return &elf_howto_table[(int) R_390_PC32DBL];
287 case BFD_RELOC_390_PLT32DBL:
288 return &elf_howto_table[(int) R_390_PLT32DBL];
289 case BFD_RELOC_390_GOTPCDBL:
290 return &elf_howto_table[(int) R_390_GOTPCDBL];
291 case BFD_RELOC_64:
292 return &elf_howto_table[(int) R_390_64];
293 case BFD_RELOC_64_PCREL:
294 return &elf_howto_table[(int) R_390_PC64];
295 case BFD_RELOC_390_GOT64:
296 return &elf_howto_table[(int) R_390_GOT64];
297 case BFD_RELOC_390_PLT64:
298 return &elf_howto_table[(int) R_390_PLT64];
299 case BFD_RELOC_390_GOTENT:
300 return &elf_howto_table[(int) R_390_GOTENT];
301 case BFD_RELOC_16_GOTOFF:
302 return &elf_howto_table[(int) R_390_GOTOFF16];
303 case BFD_RELOC_390_GOTOFF64:
304 return &elf_howto_table[(int) R_390_GOTOFF64];
305 case BFD_RELOC_390_GOTPLT12:
306 return &elf_howto_table[(int) R_390_GOTPLT12];
307 case BFD_RELOC_390_GOTPLT16:
308 return &elf_howto_table[(int) R_390_GOTPLT16];
309 case BFD_RELOC_390_GOTPLT32:
310 return &elf_howto_table[(int) R_390_GOTPLT32];
311 case BFD_RELOC_390_GOTPLT64:
312 return &elf_howto_table[(int) R_390_GOTPLT64];
313 case BFD_RELOC_390_GOTPLTENT:
314 return &elf_howto_table[(int) R_390_GOTPLTENT];
315 case BFD_RELOC_390_PLTOFF16:
316 return &elf_howto_table[(int) R_390_PLTOFF16];
317 case BFD_RELOC_390_PLTOFF32:
318 return &elf_howto_table[(int) R_390_PLTOFF32];
319 case BFD_RELOC_390_PLTOFF64:
320 return &elf_howto_table[(int) R_390_PLTOFF64];
321 case BFD_RELOC_390_TLS_LOAD:
322 return &elf_howto_table[(int) R_390_TLS_LOAD];
323 case BFD_RELOC_390_TLS_GDCALL:
324 return &elf_howto_table[(int) R_390_TLS_GDCALL];
325 case BFD_RELOC_390_TLS_LDCALL:
326 return &elf_howto_table[(int) R_390_TLS_LDCALL];
327 case BFD_RELOC_390_TLS_GD64:
328 return &elf_howto_table[(int) R_390_TLS_GD64];
329 case BFD_RELOC_390_TLS_GOTIE12:
330 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
331 case BFD_RELOC_390_TLS_GOTIE64:
332 return &elf_howto_table[(int) R_390_TLS_GOTIE64];
333 case BFD_RELOC_390_TLS_LDM64:
334 return &elf_howto_table[(int) R_390_TLS_LDM64];
335 case BFD_RELOC_390_TLS_IE64:
336 return &elf_howto_table[(int) R_390_TLS_IE64];
337 case BFD_RELOC_390_TLS_IEENT:
338 return &elf_howto_table[(int) R_390_TLS_IEENT];
339 case BFD_RELOC_390_TLS_LE64:
340 return &elf_howto_table[(int) R_390_TLS_LE64];
341 case BFD_RELOC_390_TLS_LDO64:
342 return &elf_howto_table[(int) R_390_TLS_LDO64];
343 case BFD_RELOC_390_TLS_DTPMOD:
344 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
345 case BFD_RELOC_390_TLS_DTPOFF:
346 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
347 case BFD_RELOC_390_TLS_TPOFF:
348 return &elf_howto_table[(int) R_390_TLS_TPOFF];
349 case BFD_RELOC_390_20:
350 return &elf_howto_table[(int) R_390_20];
351 case BFD_RELOC_390_GOT20:
352 return &elf_howto_table[(int) R_390_GOT20];
353 case BFD_RELOC_390_GOTPLT20:
354 return &elf_howto_table[(int) R_390_GOTPLT20];
355 case BFD_RELOC_390_TLS_GOTIE20:
356 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
357 case BFD_RELOC_VTABLE_INHERIT:
358 return &elf64_s390_vtinherit_howto;
359 case BFD_RELOC_VTABLE_ENTRY:
360 return &elf64_s390_vtentry_howto;
361 default:
362 break;
363 }
364 return 0;
365 }
366
367 /* We need to use ELF64_R_TYPE so we have our own copy of this function,
368 and elf64-s390.c has its own copy. */
369
370 static void
371 elf_s390_info_to_howto (abfd, cache_ptr, dst)
372 bfd *abfd ATTRIBUTE_UNUSED;
373 arelent *cache_ptr;
374 Elf_Internal_Rela *dst;
375 {
376 unsigned int r_type = ELF64_R_TYPE(dst->r_info);
377 switch (r_type)
378 {
379 case R_390_GNU_VTINHERIT:
380 cache_ptr->howto = &elf64_s390_vtinherit_howto;
381 break;
382
383 case R_390_GNU_VTENTRY:
384 cache_ptr->howto = &elf64_s390_vtentry_howto;
385 break;
386
387 default:
388 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
389 {
390 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
391 abfd, (int) r_type);
392 r_type = R_390_NONE;
393 }
394 cache_ptr->howto = &elf_howto_table[r_type];
395 }
396 }
397
398 /* A relocation function which doesn't do anything. */
399 static bfd_reloc_status_type
400 s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section,
401 output_bfd, error_message)
402 bfd *abfd ATTRIBUTE_UNUSED;
403 arelent *reloc_entry;
404 asymbol *symbol ATTRIBUTE_UNUSED;
405 PTR data ATTRIBUTE_UNUSED;
406 asection *input_section;
407 bfd *output_bfd;
408 char **error_message ATTRIBUTE_UNUSED;
409 {
410 if (output_bfd)
411 reloc_entry->address += input_section->output_offset;
412 return bfd_reloc_ok;
413 }
414
415 /* Handle the large displacement relocs. */
416 static bfd_reloc_status_type
417 s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section,
418 output_bfd, error_message)
419 bfd *abfd;
420 arelent *reloc_entry;
421 asymbol *symbol;
422 PTR data;
423 asection *input_section;
424 bfd *output_bfd;
425 char **error_message ATTRIBUTE_UNUSED;
426 {
427 reloc_howto_type *howto = reloc_entry->howto;
428 bfd_vma relocation;
429 bfd_vma insn;
430
431 if (output_bfd != (bfd *) NULL
432 && (symbol->flags & BSF_SECTION_SYM) == 0
433 && (! howto->partial_inplace
434 || reloc_entry->addend == 0))
435 {
436 reloc_entry->address += input_section->output_offset;
437 return bfd_reloc_ok;
438 }
439 if (output_bfd != NULL)
440 return bfd_reloc_continue;
441
442 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
443 return bfd_reloc_outofrange;
444
445 relocation = (symbol->value
446 + symbol->section->output_section->vma
447 + symbol->section->output_offset);
448 relocation += reloc_entry->addend;
449 if (howto->pc_relative)
450 {
451 relocation -= (input_section->output_section->vma
452 + input_section->output_offset);
453 relocation -= reloc_entry->address;
454 }
455
456 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
457 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
458 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
459
460 if ((bfd_signed_vma) relocation < - 0x80000
461 || (bfd_signed_vma) relocation > 0x7ffff)
462 return bfd_reloc_overflow;
463 else
464 return bfd_reloc_ok;
465 }
466
467 static bfd_boolean
468 elf_s390_is_local_label_name (abfd, name)
469 bfd *abfd;
470 const char *name;
471 {
472 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
473 return TRUE;
474
475 return _bfd_elf_is_local_label_name (abfd, name);
476 }
477
478 /* Functions for the 390 ELF linker. */
479
480 /* The name of the dynamic interpreter. This is put in the .interp
481 section. */
482
483 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
484
485 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
486 copying dynamic variables from a shared lib into an app's dynbss
487 section, and instead use a dynamic relocation to point into the
488 shared lib. */
489 #define ELIMINATE_COPY_RELOCS 1
490
491 /* The size in bytes of the first entry in the procedure linkage table. */
492 #define PLT_FIRST_ENTRY_SIZE 32
493 /* The size in bytes of an entry in the procedure linkage table. */
494 #define PLT_ENTRY_SIZE 32
495
496 #define GOT_ENTRY_SIZE 8
497
498 /* The first three entries in a procedure linkage table are reserved,
499 and the initial contents are unimportant (we zero them out).
500 Subsequent entries look like this. See the SVR4 ABI 386
501 supplement to see how this works. */
502
503 /* For the s390, simple addr offset can only be 0 - 4096.
504 To use the full 16777216 TB address space, several instructions
505 are needed to load an address in a register and execute
506 a branch( or just saving the address)
507
508 Furthermore, only r 0 and 1 are free to use!!! */
509
510 /* The first 3 words in the GOT are then reserved.
511 Word 0 is the address of the dynamic table.
512 Word 1 is a pointer to a structure describing the object
513 Word 2 is used to point to the loader entry address.
514
515 The code for PLT entries looks like this:
516
517 The GOT holds the address in the PLT to be executed.
518 The loader then gets:
519 24(15) = Pointer to the structure describing the object.
520 28(15) = Offset in symbol table
521 The loader must then find the module where the function is
522 and insert the address in the GOT.
523
524 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
525 LG 1,0(1) # 6 bytes Load address from GOT in r1
526 BCR 15,1 # 2 bytes Jump to address
527 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
528 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1
529 BRCL 15,-x # 6 bytes Jump to start of PLT
530 .long ? # 4 bytes offset into symbol table
531
532 Total = 32 bytes per PLT entry
533 Fixup at offset 2: relative address to GOT entry
534 Fixup at offset 22: relative branch to PLT0
535 Fixup at offset 28: 32 bit offset into symbol table
536
537 A 32 bit offset into the symbol table is enough. It allows for symbol
538 tables up to a size of 2 gigabyte. A single dynamic object (the main
539 program, any shared library) is limited to 4GB in size and I want to see
540 the program that manages to have a symbol table of more than 2 GB with a
541 total size of at max 4 GB. */
542
543 #define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000
544 #define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310
545 #define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004
546 #define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10
547 #define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c
548 #define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4
549 #define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000
550 #define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000
551
552 /* The first PLT entry pushes the offset into the symbol table
553 from R1 onto the stack at 8(15) and the loader object info
554 at 12(15), loads the loader address in R1 and jumps to it. */
555
556 /* The first entry in the PLT:
557
558 PLT0:
559 STG 1,56(15) # r1 contains the offset into the symbol table
560 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
561 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
562 LG 1,16(1) # get entry address of loader
563 BCR 15,1 # jump to loader
564
565 Fixup at offset 8: relative address to start of GOT. */
566
567 #define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038
568 #define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010
569 #define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000
570 #define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030
571 #define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310
572 #define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004
573 #define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700
574 #define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700
575
576 /* The s390 linker needs to keep track of the number of relocs that it
577 decides to copy as dynamic relocs in check_relocs for each symbol.
578 This is so that it can later discard them if they are found to be
579 unnecessary. We store the information in a field extending the
580 regular ELF linker hash table. */
581
582 struct elf_s390_dyn_relocs
583 {
584 struct elf_s390_dyn_relocs *next;
585
586 /* The input section of the reloc. */
587 asection *sec;
588
589 /* Total number of relocs copied for the input section. */
590 bfd_size_type count;
591
592 /* Number of pc-relative relocs copied for the input section. */
593 bfd_size_type pc_count;
594 };
595
596 /* s390 ELF linker hash entry. */
597
598 struct elf_s390_link_hash_entry
599 {
600 struct elf_link_hash_entry elf;
601
602 /* Track dynamic relocs copied for this symbol. */
603 struct elf_s390_dyn_relocs *dyn_relocs;
604
605 /* Number of GOTPLT references for a function. */
606 bfd_signed_vma gotplt_refcount;
607
608 #define GOT_UNKNOWN 0
609 #define GOT_NORMAL 1
610 #define GOT_TLS_GD 2
611 #define GOT_TLS_IE 3
612 #define GOT_TLS_IE_NLT 3
613 unsigned char tls_type;
614 };
615
616 #define elf_s390_hash_entry(ent) \
617 ((struct elf_s390_link_hash_entry *)(ent))
618
619 struct elf_s390_obj_tdata
620 {
621 struct elf_obj_tdata root;
622
623 /* tls_type for each local got entry. */
624 char *local_got_tls_type;
625 };
626
627 #define elf_s390_tdata(abfd) \
628 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
629
630 #define elf_s390_local_got_tls_type(abfd) \
631 (elf_s390_tdata (abfd)->local_got_tls_type)
632
633 static bfd_boolean
634 elf_s390_mkobject (abfd)
635 bfd *abfd;
636 {
637 bfd_size_type amt = sizeof (struct elf_s390_obj_tdata);
638 abfd->tdata.any = bfd_zalloc (abfd, amt);
639 if (abfd->tdata.any == NULL)
640 return FALSE;
641 return TRUE;
642 }
643
644 static bfd_boolean
645 elf_s390_object_p (abfd)
646 bfd *abfd;
647 {
648 /* Set the right machine number for an s390 elf32 file. */
649 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
650 }
651
652 /* s390 ELF linker hash table. */
653
654 struct elf_s390_link_hash_table
655 {
656 struct elf_link_hash_table elf;
657
658 /* Short-cuts to get to dynamic linker sections. */
659 asection *sgot;
660 asection *sgotplt;
661 asection *srelgot;
662 asection *splt;
663 asection *srelplt;
664 asection *sdynbss;
665 asection *srelbss;
666
667 union {
668 bfd_signed_vma refcount;
669 bfd_vma offset;
670 } tls_ldm_got;
671
672 /* Small local sym to section mapping cache. */
673 struct sym_sec_cache sym_sec;
674 };
675
676 /* Get the s390 ELF linker hash table from a link_info structure. */
677
678 #define elf_s390_hash_table(p) \
679 ((struct elf_s390_link_hash_table *) ((p)->hash))
680
681 /* Create an entry in an s390 ELF linker hash table. */
682
683 static struct bfd_hash_entry *
684 link_hash_newfunc (entry, table, string)
685 struct bfd_hash_entry *entry;
686 struct bfd_hash_table *table;
687 const char *string;
688 {
689 /* Allocate the structure if it has not already been allocated by a
690 subclass. */
691 if (entry == NULL)
692 {
693 entry = bfd_hash_allocate (table,
694 sizeof (struct elf_s390_link_hash_entry));
695 if (entry == NULL)
696 return entry;
697 }
698
699 /* Call the allocation method of the superclass. */
700 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
701 if (entry != NULL)
702 {
703 struct elf_s390_link_hash_entry *eh;
704
705 eh = (struct elf_s390_link_hash_entry *) entry;
706 eh->dyn_relocs = NULL;
707 eh->gotplt_refcount = 0;
708 eh->tls_type = GOT_UNKNOWN;
709 }
710
711 return entry;
712 }
713
714 /* Create an s390 ELF linker hash table. */
715
716 static struct bfd_link_hash_table *
717 elf_s390_link_hash_table_create (abfd)
718 bfd *abfd;
719 {
720 struct elf_s390_link_hash_table *ret;
721 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
722
723 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
724 if (ret == NULL)
725 return NULL;
726
727 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
728 {
729 free (ret);
730 return NULL;
731 }
732
733 ret->sgot = NULL;
734 ret->sgotplt = NULL;
735 ret->srelgot = NULL;
736 ret->splt = NULL;
737 ret->srelplt = NULL;
738 ret->sdynbss = NULL;
739 ret->srelbss = NULL;
740 ret->tls_ldm_got.refcount = 0;
741 ret->sym_sec.abfd = NULL;
742
743 return &ret->elf.root;
744 }
745
746 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
747 shortcuts to them in our hash table. */
748
749 static bfd_boolean
750 create_got_section (dynobj, info)
751 bfd *dynobj;
752 struct bfd_link_info *info;
753 {
754 struct elf_s390_link_hash_table *htab;
755
756 if (! _bfd_elf_create_got_section (dynobj, info))
757 return FALSE;
758
759 htab = elf_s390_hash_table (info);
760 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
761 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
762 if (!htab->sgot || !htab->sgotplt)
763 abort ();
764
765 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got",
766 (SEC_ALLOC | SEC_LOAD
767 | SEC_HAS_CONTENTS
768 | SEC_IN_MEMORY
769 | SEC_LINKER_CREATED
770 | SEC_READONLY));
771 if (htab->srelgot == NULL
772 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3))
773 return FALSE;
774 return TRUE;
775 }
776
777 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
778 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
779 hash table. */
780
781 static bfd_boolean
782 elf_s390_create_dynamic_sections (dynobj, info)
783 bfd *dynobj;
784 struct bfd_link_info *info;
785 {
786 struct elf_s390_link_hash_table *htab;
787
788 htab = elf_s390_hash_table (info);
789 if (!htab->sgot && !create_got_section (dynobj, info))
790 return FALSE;
791
792 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
793 return FALSE;
794
795 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
796 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
797 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
798 if (!info->shared)
799 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
800
801 if (!htab->splt || !htab->srelplt || !htab->sdynbss
802 || (!info->shared && !htab->srelbss))
803 abort ();
804
805 return TRUE;
806 }
807
808 /* Copy the extra info we tack onto an elf_link_hash_entry. */
809
810 static void
811 elf_s390_copy_indirect_symbol (bed, dir, ind)
812 const struct elf_backend_data *bed;
813 struct elf_link_hash_entry *dir, *ind;
814 {
815 struct elf_s390_link_hash_entry *edir, *eind;
816
817 edir = (struct elf_s390_link_hash_entry *) dir;
818 eind = (struct elf_s390_link_hash_entry *) ind;
819
820 if (eind->dyn_relocs != NULL)
821 {
822 if (edir->dyn_relocs != NULL)
823 {
824 struct elf_s390_dyn_relocs **pp;
825 struct elf_s390_dyn_relocs *p;
826
827 if (ind->root.type == bfd_link_hash_indirect)
828 abort ();
829
830 /* Add reloc counts against the weak sym to the strong sym
831 list. Merge any entries against the same section. */
832 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
833 {
834 struct elf_s390_dyn_relocs *q;
835
836 for (q = edir->dyn_relocs; q != NULL; q = q->next)
837 if (q->sec == p->sec)
838 {
839 q->pc_count += p->pc_count;
840 q->count += p->count;
841 *pp = p->next;
842 break;
843 }
844 if (q == NULL)
845 pp = &p->next;
846 }
847 *pp = edir->dyn_relocs;
848 }
849
850 edir->dyn_relocs = eind->dyn_relocs;
851 eind->dyn_relocs = NULL;
852 }
853
854 if (ind->root.type == bfd_link_hash_indirect
855 && dir->got.refcount <= 0)
856 {
857 edir->tls_type = eind->tls_type;
858 eind->tls_type = GOT_UNKNOWN;
859 }
860
861 if (ELIMINATE_COPY_RELOCS
862 && ind->root.type != bfd_link_hash_indirect
863 && dir->dynamic_adjusted)
864 {
865 /* If called to transfer flags for a weakdef during processing
866 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
867 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
868 dir->ref_dynamic |= ind->ref_dynamic;
869 dir->ref_regular |= ind->ref_regular;
870 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
871 dir->needs_plt |= ind->needs_plt;
872 }
873 else
874 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
875 }
876
877 static int
878 elf_s390_tls_transition (info, r_type, is_local)
879 struct bfd_link_info *info;
880 int r_type;
881 int is_local;
882 {
883 if (info->shared)
884 return r_type;
885
886 switch (r_type)
887 {
888 case R_390_TLS_GD64:
889 case R_390_TLS_IE64:
890 if (is_local)
891 return R_390_TLS_LE64;
892 return R_390_TLS_IE64;
893 case R_390_TLS_GOTIE64:
894 if (is_local)
895 return R_390_TLS_LE64;
896 return R_390_TLS_GOTIE64;
897 case R_390_TLS_LDM64:
898 return R_390_TLS_LE64;
899 }
900
901 return r_type;
902 }
903
904 /* Look through the relocs for a section during the first phase, and
905 allocate space in the global offset table or procedure linkage
906 table. */
907
908 static bfd_boolean
909 elf_s390_check_relocs (abfd, info, sec, relocs)
910 bfd *abfd;
911 struct bfd_link_info *info;
912 asection *sec;
913 const Elf_Internal_Rela *relocs;
914 {
915 struct elf_s390_link_hash_table *htab;
916 Elf_Internal_Shdr *symtab_hdr;
917 struct elf_link_hash_entry **sym_hashes;
918 const Elf_Internal_Rela *rel;
919 const Elf_Internal_Rela *rel_end;
920 asection *sreloc;
921 bfd_signed_vma *local_got_refcounts;
922 int tls_type, old_tls_type;
923
924 if (info->relocatable)
925 return TRUE;
926
927 htab = elf_s390_hash_table (info);
928 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
929 sym_hashes = elf_sym_hashes (abfd);
930 local_got_refcounts = elf_local_got_refcounts (abfd);
931
932 sreloc = NULL;
933
934 rel_end = relocs + sec->reloc_count;
935 for (rel = relocs; rel < rel_end; rel++)
936 {
937 unsigned int r_type;
938 unsigned long r_symndx;
939 struct elf_link_hash_entry *h;
940
941 r_symndx = ELF64_R_SYM (rel->r_info);
942
943 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
944 {
945 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
946 abfd,
947 r_symndx);
948 return FALSE;
949 }
950
951 if (r_symndx < symtab_hdr->sh_info)
952 h = NULL;
953 else
954 {
955 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
956 while (h->root.type == bfd_link_hash_indirect
957 || h->root.type == bfd_link_hash_warning)
958 h = (struct elf_link_hash_entry *) h->root.u.i.link;
959 }
960
961 /* Create got section and local_got_refcounts array if they
962 are needed. */
963 r_type = elf_s390_tls_transition (info,
964 ELF64_R_TYPE (rel->r_info),
965 h == NULL);
966 switch (r_type)
967 {
968 case R_390_GOT12:
969 case R_390_GOT16:
970 case R_390_GOT20:
971 case R_390_GOT32:
972 case R_390_GOT64:
973 case R_390_GOTENT:
974 case R_390_GOTPLT12:
975 case R_390_GOTPLT16:
976 case R_390_GOTPLT20:
977 case R_390_GOTPLT32:
978 case R_390_GOTPLT64:
979 case R_390_GOTPLTENT:
980 case R_390_TLS_GD64:
981 case R_390_TLS_GOTIE12:
982 case R_390_TLS_GOTIE20:
983 case R_390_TLS_GOTIE64:
984 case R_390_TLS_IEENT:
985 case R_390_TLS_IE64:
986 case R_390_TLS_LDM64:
987 if (h == NULL
988 && local_got_refcounts == NULL)
989 {
990 bfd_size_type size;
991
992 size = symtab_hdr->sh_info;
993 size *= (sizeof (bfd_signed_vma) + sizeof(char));
994 local_got_refcounts = ((bfd_signed_vma *)
995 bfd_zalloc (abfd, size));
996 if (local_got_refcounts == NULL)
997 return FALSE;
998 elf_local_got_refcounts (abfd) = local_got_refcounts;
999 elf_s390_local_got_tls_type (abfd)
1000 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1001 }
1002 /* Fall through. */
1003 case R_390_GOTOFF16:
1004 case R_390_GOTOFF32:
1005 case R_390_GOTOFF64:
1006 case R_390_GOTPC:
1007 case R_390_GOTPCDBL:
1008 if (htab->sgot == NULL)
1009 {
1010 if (htab->elf.dynobj == NULL)
1011 htab->elf.dynobj = abfd;
1012 if (!create_got_section (htab->elf.dynobj, info))
1013 return FALSE;
1014 }
1015 }
1016
1017 switch (r_type)
1018 {
1019 case R_390_GOTOFF16:
1020 case R_390_GOTOFF32:
1021 case R_390_GOTOFF64:
1022 case R_390_GOTPC:
1023 case R_390_GOTPCDBL:
1024 /* Got is created, nothing to be done. */
1025 break;
1026
1027 case R_390_PLT16DBL:
1028 case R_390_PLT32:
1029 case R_390_PLT32DBL:
1030 case R_390_PLT64:
1031 case R_390_PLTOFF16:
1032 case R_390_PLTOFF32:
1033 case R_390_PLTOFF64:
1034 /* This symbol requires a procedure linkage table entry. We
1035 actually build the entry in adjust_dynamic_symbol,
1036 because this might be a case of linking PIC code which is
1037 never referenced by a dynamic object, in which case we
1038 don't need to generate a procedure linkage table entry
1039 after all. */
1040
1041 /* If this is a local symbol, we resolve it directly without
1042 creating a procedure linkage table entry. */
1043 if (h != NULL)
1044 {
1045 h->needs_plt = 1;
1046 h->plt.refcount += 1;
1047 }
1048 break;
1049
1050 case R_390_GOTPLT12:
1051 case R_390_GOTPLT16:
1052 case R_390_GOTPLT20:
1053 case R_390_GOTPLT32:
1054 case R_390_GOTPLT64:
1055 case R_390_GOTPLTENT:
1056 /* This symbol requires either a procedure linkage table entry
1057 or an entry in the local got. We actually build the entry
1058 in adjust_dynamic_symbol because whether this is really a
1059 global reference can change and with it the fact if we have
1060 to create a plt entry or a local got entry. To be able to
1061 make a once global symbol a local one we have to keep track
1062 of the number of gotplt references that exist for this
1063 symbol. */
1064 if (h != NULL)
1065 {
1066 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1067 h->needs_plt = 1;
1068 h->plt.refcount += 1;
1069 }
1070 else
1071 local_got_refcounts[r_symndx] += 1;
1072 break;
1073
1074 case R_390_TLS_LDM64:
1075 htab->tls_ldm_got.refcount += 1;
1076 break;
1077
1078 case R_390_TLS_IE64:
1079 case R_390_TLS_GOTIE12:
1080 case R_390_TLS_GOTIE20:
1081 case R_390_TLS_GOTIE64:
1082 case R_390_TLS_IEENT:
1083 if (info->shared)
1084 info->flags |= DF_STATIC_TLS;
1085 /* Fall through */
1086
1087 case R_390_GOT12:
1088 case R_390_GOT16:
1089 case R_390_GOT20:
1090 case R_390_GOT32:
1091 case R_390_GOT64:
1092 case R_390_GOTENT:
1093 case R_390_TLS_GD64:
1094 /* This symbol requires a global offset table entry. */
1095 switch (r_type)
1096 {
1097 default:
1098 case R_390_GOT12:
1099 case R_390_GOT16:
1100 case R_390_GOT20:
1101 case R_390_GOT32:
1102 case R_390_GOTENT:
1103 tls_type = GOT_NORMAL;
1104 break;
1105 case R_390_TLS_GD64:
1106 tls_type = GOT_TLS_GD;
1107 break;
1108 case R_390_TLS_IE64:
1109 case R_390_TLS_GOTIE64:
1110 tls_type = GOT_TLS_IE;
1111 break;
1112 case R_390_TLS_GOTIE12:
1113 case R_390_TLS_GOTIE20:
1114 case R_390_TLS_IEENT:
1115 tls_type = GOT_TLS_IE_NLT;
1116 break;
1117 }
1118
1119 if (h != NULL)
1120 {
1121 h->got.refcount += 1;
1122 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1123 }
1124 else
1125 {
1126 local_got_refcounts[r_symndx] += 1;
1127 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1128 }
1129 /* If a TLS symbol is accessed using IE at least once,
1130 there is no point to use dynamic model for it. */
1131 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1132 {
1133 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1134 {
1135 (*_bfd_error_handler)
1136 (_("%B: `%s' accessed both as normal and thread local symbol"),
1137 abfd, h->root.root.string);
1138 return FALSE;
1139 }
1140 if (old_tls_type > tls_type)
1141 tls_type = old_tls_type;
1142 }
1143
1144 if (old_tls_type != tls_type)
1145 {
1146 if (h != NULL)
1147 elf_s390_hash_entry (h)->tls_type = tls_type;
1148 else
1149 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1150 }
1151
1152 if (r_type != R_390_TLS_IE64)
1153 break;
1154 /* Fall through */
1155
1156 case R_390_TLS_LE64:
1157 if (!info->shared)
1158 break;
1159 info->flags |= DF_STATIC_TLS;
1160 /* Fall through */
1161
1162 case R_390_8:
1163 case R_390_16:
1164 case R_390_32:
1165 case R_390_64:
1166 case R_390_PC16:
1167 case R_390_PC16DBL:
1168 case R_390_PC32:
1169 case R_390_PC32DBL:
1170 case R_390_PC64:
1171 if (h != NULL && !info->shared)
1172 {
1173 /* If this reloc is in a read-only section, we might
1174 need a copy reloc. We can't check reliably at this
1175 stage whether the section is read-only, as input
1176 sections have not yet been mapped to output sections.
1177 Tentatively set the flag for now, and correct in
1178 adjust_dynamic_symbol. */
1179 h->non_got_ref = 1;
1180
1181 /* We may need a .plt entry if the function this reloc
1182 refers to is in a shared lib. */
1183 h->plt.refcount += 1;
1184 }
1185
1186 /* If we are creating a shared library, and this is a reloc
1187 against a global symbol, or a non PC relative reloc
1188 against a local symbol, then we need to copy the reloc
1189 into the shared library. However, if we are linking with
1190 -Bsymbolic, we do not need to copy a reloc against a
1191 global symbol which is defined in an object we are
1192 including in the link (i.e., DEF_REGULAR is set). At
1193 this point we have not seen all the input files, so it is
1194 possible that DEF_REGULAR is not set now but will be set
1195 later (it is never cleared). In case of a weak definition,
1196 DEF_REGULAR may be cleared later by a strong definition in
1197 a shared library. We account for that possibility below by
1198 storing information in the relocs_copied field of the hash
1199 table entry. A similar situation occurs when creating
1200 shared libraries and symbol visibility changes render the
1201 symbol local.
1202
1203 If on the other hand, we are creating an executable, we
1204 may need to keep relocations for symbols satisfied by a
1205 dynamic library if we manage to avoid copy relocs for the
1206 symbol. */
1207 if ((info->shared
1208 && (sec->flags & SEC_ALLOC) != 0
1209 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
1210 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
1211 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
1212 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
1213 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
1214 || (h != NULL
1215 && (! info->symbolic
1216 || h->root.type == bfd_link_hash_defweak
1217 || !h->def_regular))))
1218 || (ELIMINATE_COPY_RELOCS
1219 && !info->shared
1220 && (sec->flags & SEC_ALLOC) != 0
1221 && h != NULL
1222 && (h->root.type == bfd_link_hash_defweak
1223 || !h->def_regular)))
1224 {
1225 struct elf_s390_dyn_relocs *p;
1226 struct elf_s390_dyn_relocs **head;
1227
1228 /* We must copy these reloc types into the output file.
1229 Create a reloc section in dynobj and make room for
1230 this reloc. */
1231 if (sreloc == NULL)
1232 {
1233 const char *name;
1234 bfd *dynobj;
1235
1236 name = (bfd_elf_string_from_elf_section
1237 (abfd,
1238 elf_elfheader (abfd)->e_shstrndx,
1239 elf_section_data (sec)->rel_hdr.sh_name));
1240 if (name == NULL)
1241 return FALSE;
1242
1243 if (strncmp (name, ".rela", 5) != 0
1244 || strcmp (bfd_get_section_name (abfd, sec),
1245 name + 5) != 0)
1246 {
1247 (*_bfd_error_handler)
1248 (_("%B: bad relocation section name `%s\'"),
1249 abfd, name);
1250 }
1251
1252 if (htab->elf.dynobj == NULL)
1253 htab->elf.dynobj = abfd;
1254
1255 dynobj = htab->elf.dynobj;
1256 sreloc = bfd_get_section_by_name (dynobj, name);
1257 if (sreloc == NULL)
1258 {
1259 flagword flags;
1260
1261 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1262 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1263 if ((sec->flags & SEC_ALLOC) != 0)
1264 flags |= SEC_ALLOC | SEC_LOAD;
1265 sreloc = bfd_make_section_with_flags (dynobj,
1266 name,
1267 flags);
1268 if (sreloc == NULL
1269 || ! bfd_set_section_alignment (dynobj, sreloc, 3))
1270 return FALSE;
1271 }
1272 elf_section_data (sec)->sreloc = sreloc;
1273 }
1274
1275 /* If this is a global symbol, we count the number of
1276 relocations we need for this symbol. */
1277 if (h != NULL)
1278 {
1279 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1280 }
1281 else
1282 {
1283 /* Track dynamic relocs needed for local syms too.
1284 We really need local syms available to do this
1285 easily. Oh well. */
1286
1287 asection *s;
1288 void *vpp;
1289
1290 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1291 sec, r_symndx);
1292 if (s == NULL)
1293 return FALSE;
1294
1295 vpp = &elf_section_data (s)->local_dynrel;
1296 head = (struct elf_s390_dyn_relocs **) vpp;
1297 }
1298
1299 p = *head;
1300 if (p == NULL || p->sec != sec)
1301 {
1302 bfd_size_type amt = sizeof *p;
1303 p = ((struct elf_s390_dyn_relocs *)
1304 bfd_alloc (htab->elf.dynobj, amt));
1305 if (p == NULL)
1306 return FALSE;
1307 p->next = *head;
1308 *head = p;
1309 p->sec = sec;
1310 p->count = 0;
1311 p->pc_count = 0;
1312 }
1313
1314 p->count += 1;
1315 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
1316 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1317 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
1318 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
1319 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
1320 p->pc_count += 1;
1321 }
1322 break;
1323
1324 /* This relocation describes the C++ object vtable hierarchy.
1325 Reconstruct it for later use during GC. */
1326 case R_390_GNU_VTINHERIT:
1327 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1328 return FALSE;
1329 break;
1330
1331 /* This relocation describes which C++ vtable entries are actually
1332 used. Record for later use during GC. */
1333 case R_390_GNU_VTENTRY:
1334 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1335 return FALSE;
1336 break;
1337
1338 default:
1339 break;
1340 }
1341 }
1342
1343 return TRUE;
1344 }
1345
1346 /* Return the section that should be marked against GC for a given
1347 relocation. */
1348
1349 static asection *
1350 elf_s390_gc_mark_hook (sec, info, rel, h, sym)
1351 asection *sec;
1352 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1353 Elf_Internal_Rela *rel;
1354 struct elf_link_hash_entry *h;
1355 Elf_Internal_Sym *sym;
1356 {
1357 if (h != NULL)
1358 {
1359 switch (ELF64_R_TYPE (rel->r_info))
1360 {
1361 case R_390_GNU_VTINHERIT:
1362 case R_390_GNU_VTENTRY:
1363 break;
1364
1365 default:
1366 switch (h->root.type)
1367 {
1368 case bfd_link_hash_defined:
1369 case bfd_link_hash_defweak:
1370 return h->root.u.def.section;
1371
1372 case bfd_link_hash_common:
1373 return h->root.u.c.p->section;
1374
1375 default:
1376 break;
1377 }
1378 }
1379 }
1380 else
1381 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1382
1383 return NULL;
1384 }
1385
1386 /* Update the got entry reference counts for the section being removed. */
1387
1388 static bfd_boolean
1389 elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
1390 bfd *abfd;
1391 struct bfd_link_info *info;
1392 asection *sec;
1393 const Elf_Internal_Rela *relocs;
1394 {
1395 Elf_Internal_Shdr *symtab_hdr;
1396 struct elf_link_hash_entry **sym_hashes;
1397 bfd_signed_vma *local_got_refcounts;
1398 const Elf_Internal_Rela *rel, *relend;
1399
1400 elf_section_data (sec)->local_dynrel = NULL;
1401
1402 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1403 sym_hashes = elf_sym_hashes (abfd);
1404 local_got_refcounts = elf_local_got_refcounts (abfd);
1405
1406 relend = relocs + sec->reloc_count;
1407 for (rel = relocs; rel < relend; rel++)
1408 {
1409 unsigned long r_symndx;
1410 unsigned int r_type;
1411 struct elf_link_hash_entry *h = NULL;
1412
1413 r_symndx = ELF64_R_SYM (rel->r_info);
1414 if (r_symndx >= symtab_hdr->sh_info)
1415 {
1416 struct elf_s390_link_hash_entry *eh;
1417 struct elf_s390_dyn_relocs **pp;
1418 struct elf_s390_dyn_relocs *p;
1419
1420 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1421 while (h->root.type == bfd_link_hash_indirect
1422 || h->root.type == bfd_link_hash_warning)
1423 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1424 eh = (struct elf_s390_link_hash_entry *) h;
1425
1426 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1427 if (p->sec == sec)
1428 {
1429 /* Everything must go for SEC. */
1430 *pp = p->next;
1431 break;
1432 }
1433 }
1434
1435 r_type = ELF64_R_TYPE (rel->r_info);
1436 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1437 switch (r_type)
1438 {
1439 case R_390_TLS_LDM64:
1440 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1441 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1442 break;
1443
1444 case R_390_TLS_GD64:
1445 case R_390_TLS_IE64:
1446 case R_390_TLS_GOTIE12:
1447 case R_390_TLS_GOTIE20:
1448 case R_390_TLS_GOTIE64:
1449 case R_390_TLS_IEENT:
1450 case R_390_GOT12:
1451 case R_390_GOT16:
1452 case R_390_GOT20:
1453 case R_390_GOT32:
1454 case R_390_GOT64:
1455 case R_390_GOTOFF16:
1456 case R_390_GOTOFF32:
1457 case R_390_GOTOFF64:
1458 case R_390_GOTPC:
1459 case R_390_GOTPCDBL:
1460 case R_390_GOTENT:
1461 if (h != NULL)
1462 {
1463 if (h->got.refcount > 0)
1464 h->got.refcount -= 1;
1465 }
1466 else if (local_got_refcounts != NULL)
1467 {
1468 if (local_got_refcounts[r_symndx] > 0)
1469 local_got_refcounts[r_symndx] -= 1;
1470 }
1471 break;
1472
1473 case R_390_8:
1474 case R_390_12:
1475 case R_390_16:
1476 case R_390_20:
1477 case R_390_32:
1478 case R_390_64:
1479 case R_390_PC16:
1480 case R_390_PC16DBL:
1481 case R_390_PC32:
1482 case R_390_PC32DBL:
1483 case R_390_PC64:
1484 if (info->shared)
1485 break;
1486 /* Fall through */
1487
1488 case R_390_PLT16DBL:
1489 case R_390_PLT32:
1490 case R_390_PLT32DBL:
1491 case R_390_PLT64:
1492 case R_390_PLTOFF16:
1493 case R_390_PLTOFF32:
1494 case R_390_PLTOFF64:
1495 if (h != NULL)
1496 {
1497 if (h->plt.refcount > 0)
1498 h->plt.refcount -= 1;
1499 }
1500 break;
1501
1502 case R_390_GOTPLT12:
1503 case R_390_GOTPLT16:
1504 case R_390_GOTPLT20:
1505 case R_390_GOTPLT32:
1506 case R_390_GOTPLT64:
1507 case R_390_GOTPLTENT:
1508 if (h != NULL)
1509 {
1510 if (h->plt.refcount > 0)
1511 {
1512 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1513 h->plt.refcount -= 1;
1514 }
1515 }
1516 else if (local_got_refcounts != NULL)
1517 {
1518 if (local_got_refcounts[r_symndx] > 0)
1519 local_got_refcounts[r_symndx] -= 1;
1520 }
1521 break;
1522
1523 default:
1524 break;
1525 }
1526 }
1527
1528 return TRUE;
1529 }
1530
1531 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1532 entry but we found we will not create any. Called when we find we will
1533 not have any PLT for this symbol, by for example
1534 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1535 or elf_s390_size_dynamic_sections if no dynamic sections will be
1536 created (we're only linking static objects). */
1537
1538 static void
1539 elf_s390_adjust_gotplt (h)
1540 struct elf_s390_link_hash_entry *h;
1541 {
1542 if (h->elf.root.type == bfd_link_hash_warning)
1543 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1544
1545 if (h->gotplt_refcount <= 0)
1546 return;
1547
1548 /* We simply add the number of gotplt references to the number
1549 * of got references for this symbol. */
1550 h->elf.got.refcount += h->gotplt_refcount;
1551 h->gotplt_refcount = -1;
1552 }
1553
1554 /* Adjust a symbol defined by a dynamic object and referenced by a
1555 regular object. The current definition is in some section of the
1556 dynamic object, but we're not including those sections. We have to
1557 change the definition to something the rest of the link can
1558 understand. */
1559
1560 static bfd_boolean
1561 elf_s390_adjust_dynamic_symbol (info, h)
1562 struct bfd_link_info *info;
1563 struct elf_link_hash_entry *h;
1564 {
1565 struct elf_s390_link_hash_table *htab;
1566 asection *s;
1567 unsigned int power_of_two;
1568
1569 /* If this is a function, put it in the procedure linkage table. We
1570 will fill in the contents of the procedure linkage table later
1571 (although we could actually do it here). */
1572 if (h->type == STT_FUNC
1573 || h->needs_plt)
1574 {
1575 if (h->plt.refcount <= 0
1576 || (! info->shared
1577 && !h->def_dynamic
1578 && !h->ref_dynamic
1579 && h->root.type != bfd_link_hash_undefweak
1580 && h->root.type != bfd_link_hash_undefined))
1581 {
1582 /* This case can occur if we saw a PLT32 reloc in an input
1583 file, but the symbol was never referred to by a dynamic
1584 object, or if all references were garbage collected. In
1585 such a case, we don't actually need to build a procedure
1586 linkage table, and we can just do a PC32 reloc instead. */
1587 h->plt.offset = (bfd_vma) -1;
1588 h->needs_plt = 0;
1589 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1590 }
1591
1592 return TRUE;
1593 }
1594 else
1595 /* It's possible that we incorrectly decided a .plt reloc was
1596 needed for an R_390_PC32 reloc to a non-function sym in
1597 check_relocs. We can't decide accurately between function and
1598 non-function syms in check-relocs; Objects loaded later in
1599 the link may change h->type. So fix it now. */
1600 h->plt.offset = (bfd_vma) -1;
1601
1602 /* If this is a weak symbol, and there is a real definition, the
1603 processor independent code will have arranged for us to see the
1604 real definition first, and we can just use the same value. */
1605 if (h->u.weakdef != NULL)
1606 {
1607 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1608 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1609 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1610 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1611 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1612 h->non_got_ref = h->u.weakdef->non_got_ref;
1613 return TRUE;
1614 }
1615
1616 /* This is a reference to a symbol defined by a dynamic object which
1617 is not a function. */
1618
1619 /* If we are creating a shared library, we must presume that the
1620 only references to the symbol are via the global offset table.
1621 For such cases we need not do anything here; the relocations will
1622 be handled correctly by relocate_section. */
1623 if (info->shared)
1624 return TRUE;
1625
1626 /* If there are no references to this symbol that do not use the
1627 GOT, we don't need to generate a copy reloc. */
1628 if (!h->non_got_ref)
1629 return TRUE;
1630
1631 /* If -z nocopyreloc was given, we won't generate them either. */
1632 if (info->nocopyreloc)
1633 {
1634 h->non_got_ref = 0;
1635 return TRUE;
1636 }
1637
1638 if (ELIMINATE_COPY_RELOCS)
1639 {
1640 struct elf_s390_link_hash_entry * eh;
1641 struct elf_s390_dyn_relocs *p;
1642
1643 eh = (struct elf_s390_link_hash_entry *) h;
1644 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1645 {
1646 s = p->sec->output_section;
1647 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1648 break;
1649 }
1650
1651 /* If we didn't find any dynamic relocs in read-only sections, then
1652 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1653 if (p == NULL)
1654 {
1655 h->non_got_ref = 0;
1656 return TRUE;
1657 }
1658 }
1659
1660 if (h->size == 0)
1661 {
1662 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1663 h->root.root.string);
1664 return TRUE;
1665 }
1666
1667 /* We must allocate the symbol in our .dynbss section, which will
1668 become part of the .bss section of the executable. There will be
1669 an entry for this symbol in the .dynsym section. The dynamic
1670 object will contain position independent code, so all references
1671 from the dynamic object to this symbol will go through the global
1672 offset table. The dynamic linker will use the .dynsym entry to
1673 determine the address it must put in the global offset table, so
1674 both the dynamic object and the regular object will refer to the
1675 same memory location for the variable. */
1676
1677 htab = elf_s390_hash_table (info);
1678
1679 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1680 copy the initial value out of the dynamic object and into the
1681 runtime process image. */
1682 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1683 {
1684 htab->srelbss->size += sizeof (Elf64_External_Rela);
1685 h->needs_copy = 1;
1686 }
1687
1688 /* We need to figure out the alignment required for this symbol. I
1689 have no idea how ELF linkers handle this. */
1690 power_of_two = bfd_log2 (h->size);
1691 if (power_of_two > 3)
1692 power_of_two = 3;
1693
1694 /* Apply the required alignment. */
1695 s = htab->sdynbss;
1696 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1697 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1698 {
1699 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1700 return FALSE;
1701 }
1702
1703 /* Define the symbol as being at this point in the section. */
1704 h->root.u.def.section = s;
1705 h->root.u.def.value = s->size;
1706
1707 /* Increment the section size to make room for the symbol. */
1708 s->size += h->size;
1709
1710 return TRUE;
1711 }
1712
1713 /* Allocate space in .plt, .got and associated reloc sections for
1714 dynamic relocs. */
1715
1716 static bfd_boolean
1717 allocate_dynrelocs (h, inf)
1718 struct elf_link_hash_entry *h;
1719 PTR inf;
1720 {
1721 struct bfd_link_info *info;
1722 struct elf_s390_link_hash_table *htab;
1723 struct elf_s390_link_hash_entry *eh;
1724 struct elf_s390_dyn_relocs *p;
1725
1726 if (h->root.type == bfd_link_hash_indirect)
1727 return TRUE;
1728
1729 if (h->root.type == bfd_link_hash_warning)
1730 /* When warning symbols are created, they **replace** the "real"
1731 entry in the hash table, thus we never get to see the real
1732 symbol in a hash traversal. So look at it now. */
1733 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1734
1735 info = (struct bfd_link_info *) inf;
1736 htab = elf_s390_hash_table (info);
1737
1738 if (htab->elf.dynamic_sections_created
1739 && h->plt.refcount > 0
1740 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1741 || h->root.type != bfd_link_hash_undefweak))
1742 {
1743 /* Make sure this symbol is output as a dynamic symbol.
1744 Undefined weak syms won't yet be marked as dynamic. */
1745 if (h->dynindx == -1
1746 && !h->forced_local)
1747 {
1748 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1749 return FALSE;
1750 }
1751
1752 if (info->shared
1753 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1754 {
1755 asection *s = htab->splt;
1756
1757 /* If this is the first .plt entry, make room for the special
1758 first entry. */
1759 if (s->size == 0)
1760 s->size += PLT_FIRST_ENTRY_SIZE;
1761
1762 h->plt.offset = s->size;
1763
1764 /* If this symbol is not defined in a regular file, and we are
1765 not generating a shared library, then set the symbol to this
1766 location in the .plt. This is required to make function
1767 pointers compare as equal between the normal executable and
1768 the shared library. */
1769 if (! info->shared
1770 && !h->def_regular)
1771 {
1772 h->root.u.def.section = s;
1773 h->root.u.def.value = h->plt.offset;
1774 }
1775
1776 /* Make room for this entry. */
1777 s->size += PLT_ENTRY_SIZE;
1778
1779 /* We also need to make an entry in the .got.plt section, which
1780 will be placed in the .got section by the linker script. */
1781 htab->sgotplt->size += GOT_ENTRY_SIZE;
1782
1783 /* We also need to make an entry in the .rela.plt section. */
1784 htab->srelplt->size += sizeof (Elf64_External_Rela);
1785 }
1786 else
1787 {
1788 h->plt.offset = (bfd_vma) -1;
1789 h->needs_plt = 0;
1790 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1791 }
1792 }
1793 else
1794 {
1795 h->plt.offset = (bfd_vma) -1;
1796 h->needs_plt = 0;
1797 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1798 }
1799
1800 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to
1801 the binary, we can optimize a bit. IE64 and GOTIE64 get converted
1802 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT
1803 we can save the dynamic TLS relocation. */
1804 if (h->got.refcount > 0
1805 && !info->shared
1806 && h->dynindx == -1
1807 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1808 {
1809 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1810 /* For the GOTIE access without a literal pool entry the offset has
1811 to be stored somewhere. The immediate value in the instruction
1812 is not bit enough so the value is stored in the got. */
1813 {
1814 h->got.offset = htab->sgot->size;
1815 htab->sgot->size += GOT_ENTRY_SIZE;
1816 }
1817 else
1818 h->got.offset = (bfd_vma) -1;
1819 }
1820 else if (h->got.refcount > 0)
1821 {
1822 asection *s;
1823 bfd_boolean dyn;
1824 int tls_type = elf_s390_hash_entry(h)->tls_type;
1825
1826 /* Make sure this symbol is output as a dynamic symbol.
1827 Undefined weak syms won't yet be marked as dynamic. */
1828 if (h->dynindx == -1
1829 && !h->forced_local)
1830 {
1831 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1832 return FALSE;
1833 }
1834
1835 s = htab->sgot;
1836 h->got.offset = s->size;
1837 s->size += GOT_ENTRY_SIZE;
1838 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */
1839 if (tls_type == GOT_TLS_GD)
1840 s->size += GOT_ENTRY_SIZE;
1841 dyn = htab->elf.dynamic_sections_created;
1842 /* R_390_TLS_IE64 needs one dynamic relocation,
1843 R_390_TLS_GD64 needs one if local symbol and two if global. */
1844 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1845 || tls_type >= GOT_TLS_IE)
1846 htab->srelgot->size += sizeof (Elf64_External_Rela);
1847 else if (tls_type == GOT_TLS_GD)
1848 htab->srelgot->size += 2 * sizeof (Elf64_External_Rela);
1849 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1850 || h->root.type != bfd_link_hash_undefweak)
1851 && (info->shared
1852 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1853 htab->srelgot->size += sizeof (Elf64_External_Rela);
1854 }
1855 else
1856 h->got.offset = (bfd_vma) -1;
1857
1858 eh = (struct elf_s390_link_hash_entry *) h;
1859 if (eh->dyn_relocs == NULL)
1860 return TRUE;
1861
1862 /* In the shared -Bsymbolic case, discard space allocated for
1863 dynamic pc-relative relocs against symbols which turn out to be
1864 defined in regular objects. For the normal shared case, discard
1865 space for pc-relative relocs that have become local due to symbol
1866 visibility changes. */
1867
1868 if (info->shared)
1869 {
1870 if (SYMBOL_REFERENCES_LOCAL (info, h))
1871 {
1872 struct elf_s390_dyn_relocs **pp;
1873
1874 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1875 {
1876 p->count -= p->pc_count;
1877 p->pc_count = 0;
1878 if (p->count == 0)
1879 *pp = p->next;
1880 else
1881 pp = &p->next;
1882 }
1883 }
1884
1885 /* Also discard relocs on undefined weak syms with non-default
1886 visibility. */
1887 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1888 && h->root.type == bfd_link_hash_undefweak)
1889 eh->dyn_relocs = NULL;
1890 }
1891 else if (ELIMINATE_COPY_RELOCS)
1892 {
1893 /* For the non-shared case, discard space for relocs against
1894 symbols which turn out to need copy relocs or are not
1895 dynamic. */
1896
1897 if (!h->non_got_ref
1898 && ((h->def_dynamic
1899 && !h->def_regular)
1900 || (htab->elf.dynamic_sections_created
1901 && (h->root.type == bfd_link_hash_undefweak
1902 || h->root.type == bfd_link_hash_undefined))))
1903 {
1904 /* Make sure this symbol is output as a dynamic symbol.
1905 Undefined weak syms won't yet be marked as dynamic. */
1906 if (h->dynindx == -1
1907 && !h->forced_local)
1908 {
1909 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1910 return FALSE;
1911 }
1912
1913 /* If that succeeded, we know we'll be keeping all the
1914 relocs. */
1915 if (h->dynindx != -1)
1916 goto keep;
1917 }
1918
1919 eh->dyn_relocs = NULL;
1920
1921 keep: ;
1922 }
1923
1924 /* Finally, allocate space. */
1925 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1926 {
1927 asection *sreloc = elf_section_data (p->sec)->sreloc;
1928 sreloc->size += p->count * sizeof (Elf64_External_Rela);
1929 }
1930
1931 return TRUE;
1932 }
1933
1934 /* Find any dynamic relocs that apply to read-only sections. */
1935
1936 static bfd_boolean
1937 readonly_dynrelocs (h, inf)
1938 struct elf_link_hash_entry *h;
1939 PTR inf;
1940 {
1941 struct elf_s390_link_hash_entry *eh;
1942 struct elf_s390_dyn_relocs *p;
1943
1944 if (h->root.type == bfd_link_hash_warning)
1945 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1946
1947 eh = (struct elf_s390_link_hash_entry *) h;
1948 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1949 {
1950 asection *s = p->sec->output_section;
1951
1952 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1953 {
1954 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1955
1956 info->flags |= DF_TEXTREL;
1957
1958 /* Not an error, just cut short the traversal. */
1959 return FALSE;
1960 }
1961 }
1962 return TRUE;
1963 }
1964
1965 /* Set the sizes of the dynamic sections. */
1966
1967 static bfd_boolean
1968 elf_s390_size_dynamic_sections (output_bfd, info)
1969 bfd *output_bfd ATTRIBUTE_UNUSED;
1970 struct bfd_link_info *info;
1971 {
1972 struct elf_s390_link_hash_table *htab;
1973 bfd *dynobj;
1974 asection *s;
1975 bfd_boolean relocs;
1976 bfd *ibfd;
1977
1978 htab = elf_s390_hash_table (info);
1979 dynobj = htab->elf.dynobj;
1980 if (dynobj == NULL)
1981 abort ();
1982
1983 if (htab->elf.dynamic_sections_created)
1984 {
1985 /* Set the contents of the .interp section to the interpreter. */
1986 if (info->executable)
1987 {
1988 s = bfd_get_section_by_name (dynobj, ".interp");
1989 if (s == NULL)
1990 abort ();
1991 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1992 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1993 }
1994 }
1995
1996 /* Set up .got offsets for local syms, and space for local dynamic
1997 relocs. */
1998 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1999 {
2000 bfd_signed_vma *local_got;
2001 bfd_signed_vma *end_local_got;
2002 char *local_tls_type;
2003 bfd_size_type locsymcount;
2004 Elf_Internal_Shdr *symtab_hdr;
2005 asection *srela;
2006
2007 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
2008 continue;
2009
2010 for (s = ibfd->sections; s != NULL; s = s->next)
2011 {
2012 struct elf_s390_dyn_relocs *p;
2013
2014 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
2015 {
2016 if (!bfd_is_abs_section (p->sec)
2017 && bfd_is_abs_section (p->sec->output_section))
2018 {
2019 /* Input section has been discarded, either because
2020 it is a copy of a linkonce section or due to
2021 linker script /DISCARD/, so we'll be discarding
2022 the relocs too. */
2023 }
2024 else if (p->count != 0)
2025 {
2026 srela = elf_section_data (p->sec)->sreloc;
2027 srela->size += p->count * sizeof (Elf64_External_Rela);
2028 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2029 info->flags |= DF_TEXTREL;
2030 }
2031 }
2032 }
2033
2034 local_got = elf_local_got_refcounts (ibfd);
2035 if (!local_got)
2036 continue;
2037
2038 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2039 locsymcount = symtab_hdr->sh_info;
2040 end_local_got = local_got + locsymcount;
2041 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2042 s = htab->sgot;
2043 srela = htab->srelgot;
2044 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2045 {
2046 if (*local_got > 0)
2047 {
2048 *local_got = s->size;
2049 s->size += GOT_ENTRY_SIZE;
2050 if (*local_tls_type == GOT_TLS_GD)
2051 s->size += GOT_ENTRY_SIZE;
2052 if (info->shared)
2053 srela->size += sizeof (Elf64_External_Rela);
2054 }
2055 else
2056 *local_got = (bfd_vma) -1;
2057 }
2058 }
2059
2060 if (htab->tls_ldm_got.refcount > 0)
2061 {
2062 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64
2063 relocs. */
2064 htab->tls_ldm_got.offset = htab->sgot->size;
2065 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2066 htab->srelgot->size += sizeof (Elf64_External_Rela);
2067 }
2068 else
2069 htab->tls_ldm_got.offset = -1;
2070
2071 /* Allocate global sym .plt and .got entries, and space for global
2072 sym dynamic relocs. */
2073 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2074
2075 /* We now have determined the sizes of the various dynamic sections.
2076 Allocate memory for them. */
2077 relocs = FALSE;
2078 for (s = dynobj->sections; s != NULL; s = s->next)
2079 {
2080 if ((s->flags & SEC_LINKER_CREATED) == 0)
2081 continue;
2082
2083 if (s == htab->splt
2084 || s == htab->sgot
2085 || s == htab->sgotplt
2086 || s == htab->sdynbss)
2087 {
2088 /* Strip this section if we don't need it; see the
2089 comment below. */
2090 }
2091 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
2092 {
2093 if (s->size != 0 && s != htab->srelplt)
2094 relocs = TRUE;
2095
2096 /* We use the reloc_count field as a counter if we need
2097 to copy relocs into the output file. */
2098 s->reloc_count = 0;
2099 }
2100 else
2101 {
2102 /* It's not one of our sections, so don't allocate space. */
2103 continue;
2104 }
2105
2106 if (s->size == 0)
2107 {
2108 /* If we don't need this section, strip it from the
2109 output file. This is to handle .rela.bss and
2110 .rela.plt. We must create it in
2111 create_dynamic_sections, because it must be created
2112 before the linker maps input sections to output
2113 sections. The linker does that before
2114 adjust_dynamic_symbol is called, and it is that
2115 function which decides whether anything needs to go
2116 into these sections. */
2117
2118 s->flags |= SEC_EXCLUDE;
2119 continue;
2120 }
2121
2122 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2123 continue;
2124
2125 /* Allocate memory for the section contents. We use bfd_zalloc
2126 here in case unused entries are not reclaimed before the
2127 section's contents are written out. This should not happen,
2128 but this way if it does, we get a R_390_NONE reloc instead
2129 of garbage. */
2130 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2131 if (s->contents == NULL)
2132 return FALSE;
2133 }
2134
2135 if (htab->elf.dynamic_sections_created)
2136 {
2137 /* Add some entries to the .dynamic section. We fill in the
2138 values later, in elf_s390_finish_dynamic_sections, but we
2139 must add the entries now so that we get the correct size for
2140 the .dynamic section. The DT_DEBUG entry is filled in by the
2141 dynamic linker and used by the debugger. */
2142 #define add_dynamic_entry(TAG, VAL) \
2143 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2144
2145 if (info->executable)
2146 {
2147 if (!add_dynamic_entry (DT_DEBUG, 0))
2148 return FALSE;
2149 }
2150
2151 if (htab->splt->size != 0)
2152 {
2153 if (!add_dynamic_entry (DT_PLTGOT, 0)
2154 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2155 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2156 || !add_dynamic_entry (DT_JMPREL, 0))
2157 return FALSE;
2158 }
2159
2160 if (relocs)
2161 {
2162 if (!add_dynamic_entry (DT_RELA, 0)
2163 || !add_dynamic_entry (DT_RELASZ, 0)
2164 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2165 return FALSE;
2166
2167 /* If any dynamic relocs apply to a read-only section,
2168 then we need a DT_TEXTREL entry. */
2169 if ((info->flags & DF_TEXTREL) == 0)
2170 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2171 (PTR) info);
2172
2173 if ((info->flags & DF_TEXTREL) != 0)
2174 {
2175 if (!add_dynamic_entry (DT_TEXTREL, 0))
2176 return FALSE;
2177 }
2178 }
2179 }
2180 #undef add_dynamic_entry
2181
2182 return TRUE;
2183 }
2184
2185 /* Return the base VMA address which should be subtracted from real addresses
2186 when resolving @dtpoff relocation.
2187 This is PT_TLS segment p_vaddr. */
2188
2189 static bfd_vma
2190 dtpoff_base (info)
2191 struct bfd_link_info *info;
2192 {
2193 /* If tls_sec is NULL, we should have signalled an error already. */
2194 if (elf_hash_table (info)->tls_sec == NULL)
2195 return 0;
2196 return elf_hash_table (info)->tls_sec->vma;
2197 }
2198
2199 /* Return the relocation value for @tpoff relocation
2200 if STT_TLS virtual address is ADDRESS. */
2201
2202 static bfd_vma
2203 tpoff (info, address)
2204 struct bfd_link_info *info;
2205 bfd_vma address;
2206 {
2207 struct elf_link_hash_table *htab = elf_hash_table (info);
2208
2209 /* If tls_sec is NULL, we should have signalled an error already. */
2210 if (htab->tls_sec == NULL)
2211 return 0;
2212 return htab->tls_size + htab->tls_sec->vma - address;
2213 }
2214
2215 /* Complain if TLS instruction relocation is against an invalid
2216 instruction. */
2217
2218 static void
2219 invalid_tls_insn (input_bfd, input_section, rel)
2220 bfd *input_bfd;
2221 asection *input_section;
2222 Elf_Internal_Rela *rel;
2223 {
2224 reloc_howto_type *howto;
2225
2226 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
2227 (*_bfd_error_handler)
2228 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2229 input_bfd,
2230 input_section,
2231 (long) rel->r_offset,
2232 howto->name);
2233 }
2234
2235 /* Relocate a 390 ELF section. */
2236
2237 static bfd_boolean
2238 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2239 contents, relocs, local_syms, local_sections)
2240 bfd *output_bfd;
2241 struct bfd_link_info *info;
2242 bfd *input_bfd;
2243 asection *input_section;
2244 bfd_byte *contents;
2245 Elf_Internal_Rela *relocs;
2246 Elf_Internal_Sym *local_syms;
2247 asection **local_sections;
2248 {
2249 struct elf_s390_link_hash_table *htab;
2250 Elf_Internal_Shdr *symtab_hdr;
2251 struct elf_link_hash_entry **sym_hashes;
2252 bfd_vma *local_got_offsets;
2253 Elf_Internal_Rela *rel;
2254 Elf_Internal_Rela *relend;
2255
2256 if (info->relocatable)
2257 return TRUE;
2258
2259 htab = elf_s390_hash_table (info);
2260 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2261 sym_hashes = elf_sym_hashes (input_bfd);
2262 local_got_offsets = elf_local_got_offsets (input_bfd);
2263
2264 rel = relocs;
2265 relend = relocs + input_section->reloc_count;
2266 for (; rel < relend; rel++)
2267 {
2268 unsigned int r_type;
2269 reloc_howto_type *howto;
2270 unsigned long r_symndx;
2271 struct elf_link_hash_entry *h;
2272 Elf_Internal_Sym *sym;
2273 asection *sec;
2274 bfd_vma off;
2275 bfd_vma relocation;
2276 bfd_boolean unresolved_reloc;
2277 bfd_reloc_status_type r;
2278 int tls_type;
2279
2280 r_type = ELF64_R_TYPE (rel->r_info);
2281 if (r_type == (int) R_390_GNU_VTINHERIT
2282 || r_type == (int) R_390_GNU_VTENTRY)
2283 continue;
2284 if (r_type >= (int) R_390_max)
2285 {
2286 bfd_set_error (bfd_error_bad_value);
2287 return FALSE;
2288 }
2289
2290 howto = elf_howto_table + r_type;
2291 r_symndx = ELF64_R_SYM (rel->r_info);
2292
2293 /* This is a final link. */
2294 h = NULL;
2295 sym = NULL;
2296 sec = NULL;
2297 unresolved_reloc = FALSE;
2298 if (r_symndx < symtab_hdr->sh_info)
2299 {
2300 sym = local_syms + r_symndx;
2301 sec = local_sections[r_symndx];
2302 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2303 }
2304 else
2305 {
2306 bfd_boolean warned ATTRIBUTE_UNUSED;
2307
2308 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2309 r_symndx, symtab_hdr, sym_hashes,
2310 h, sec, relocation,
2311 unresolved_reloc, warned);
2312 }
2313
2314 switch (r_type)
2315 {
2316 case R_390_GOTPLT12:
2317 case R_390_GOTPLT16:
2318 case R_390_GOTPLT20:
2319 case R_390_GOTPLT32:
2320 case R_390_GOTPLT64:
2321 case R_390_GOTPLTENT:
2322 /* There are three cases for a GOTPLT relocation. 1) The
2323 relocation is against the jump slot entry of a plt that
2324 will get emitted to the output file. 2) The relocation
2325 is against the jump slot of a plt entry that has been
2326 removed. elf_s390_adjust_gotplt has created a GOT entry
2327 as replacement. 3) The relocation is against a local symbol.
2328 Cases 2) and 3) are the same as the GOT relocation code
2329 so we just have to test for case 1 and fall through for
2330 the other two. */
2331 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2332 {
2333 bfd_vma plt_index;
2334
2335 /* Calc. index no.
2336 Current offset - size first entry / entry size. */
2337 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2338 PLT_ENTRY_SIZE;
2339
2340 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2341 addr & GOT addr. */
2342 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2343 unresolved_reloc = FALSE;
2344
2345 if (r_type == R_390_GOTPLTENT)
2346 relocation += htab->sgot->output_section->vma;
2347 break;
2348 }
2349 /* Fall through. */
2350
2351 case R_390_GOT12:
2352 case R_390_GOT16:
2353 case R_390_GOT20:
2354 case R_390_GOT32:
2355 case R_390_GOT64:
2356 case R_390_GOTENT:
2357 /* Relocation is to the entry for this symbol in the global
2358 offset table. */
2359 if (htab->sgot == NULL)
2360 abort ();
2361
2362 if (h != NULL)
2363 {
2364 bfd_boolean dyn;
2365
2366 off = h->got.offset;
2367 dyn = htab->elf.dynamic_sections_created;
2368 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2369 || (info->shared
2370 && (info->symbolic
2371 || h->dynindx == -1
2372 || h->forced_local)
2373 && h->def_regular)
2374 || (ELF_ST_VISIBILITY (h->other)
2375 && h->root.type == bfd_link_hash_undefweak))
2376 {
2377 /* This is actually a static link, or it is a
2378 -Bsymbolic link and the symbol is defined
2379 locally, or the symbol was forced to be local
2380 because of a version file. We must initialize
2381 this entry in the global offset table. Since the
2382 offset must always be a multiple of 2, we use the
2383 least significant bit to record whether we have
2384 initialized it already.
2385
2386 When doing a dynamic link, we create a .rel.got
2387 relocation entry to initialize the value. This
2388 is done in the finish_dynamic_symbol routine. */
2389 if ((off & 1) != 0)
2390 off &= ~1;
2391 else
2392 {
2393 bfd_put_64 (output_bfd, relocation,
2394 htab->sgot->contents + off);
2395 h->got.offset |= 1;
2396 }
2397 }
2398 else
2399 unresolved_reloc = FALSE;
2400 }
2401 else
2402 {
2403 if (local_got_offsets == NULL)
2404 abort ();
2405
2406 off = local_got_offsets[r_symndx];
2407
2408 /* The offset must always be a multiple of 8. We use
2409 the least significant bit to record whether we have
2410 already generated the necessary reloc. */
2411 if ((off & 1) != 0)
2412 off &= ~1;
2413 else
2414 {
2415 bfd_put_64 (output_bfd, relocation,
2416 htab->sgot->contents + off);
2417
2418 if (info->shared)
2419 {
2420 asection *s;
2421 Elf_Internal_Rela outrel;
2422 bfd_byte *loc;
2423
2424 s = htab->srelgot;
2425 if (s == NULL)
2426 abort ();
2427
2428 outrel.r_offset = (htab->sgot->output_section->vma
2429 + htab->sgot->output_offset
2430 + off);
2431 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2432 outrel.r_addend = relocation;
2433 loc = s->contents;
2434 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2435 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2436 }
2437
2438 local_got_offsets[r_symndx] |= 1;
2439 }
2440 }
2441
2442 if (off >= (bfd_vma) -2)
2443 abort ();
2444
2445 relocation = htab->sgot->output_offset + off;
2446
2447 /* For @GOTENT the relocation is against the offset between
2448 the instruction and the symbols entry in the GOT and not
2449 between the start of the GOT and the symbols entry. We
2450 add the vma of the GOT to get the correct value. */
2451 if ( r_type == R_390_GOTENT
2452 || r_type == R_390_GOTPLTENT)
2453 relocation += htab->sgot->output_section->vma;
2454
2455 break;
2456
2457 case R_390_GOTOFF16:
2458 case R_390_GOTOFF32:
2459 case R_390_GOTOFF64:
2460 /* Relocation is relative to the start of the global offset
2461 table. */
2462
2463 /* Note that sgot->output_offset is not involved in this
2464 calculation. We always want the start of .got. If we
2465 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2466 permitted by the ABI, we might have to change this
2467 calculation. */
2468 relocation -= htab->sgot->output_section->vma;
2469 break;
2470
2471 case R_390_GOTPC:
2472 case R_390_GOTPCDBL:
2473 /* Use global offset table as symbol value. */
2474 relocation = htab->sgot->output_section->vma;
2475 unresolved_reloc = FALSE;
2476 break;
2477
2478 case R_390_PLT16DBL:
2479 case R_390_PLT32:
2480 case R_390_PLT32DBL:
2481 case R_390_PLT64:
2482 /* Relocation is to the entry for this symbol in the
2483 procedure linkage table. */
2484
2485 /* Resolve a PLT32 reloc against a local symbol directly,
2486 without using the procedure linkage table. */
2487 if (h == NULL)
2488 break;
2489
2490 if (h->plt.offset == (bfd_vma) -1
2491 || htab->splt == NULL)
2492 {
2493 /* We didn't make a PLT entry for this symbol. This
2494 happens when statically linking PIC code, or when
2495 using -Bsymbolic. */
2496 break;
2497 }
2498
2499 relocation = (htab->splt->output_section->vma
2500 + htab->splt->output_offset
2501 + h->plt.offset);
2502 unresolved_reloc = FALSE;
2503 break;
2504
2505 case R_390_PLTOFF16:
2506 case R_390_PLTOFF32:
2507 case R_390_PLTOFF64:
2508 /* Relocation is to the entry for this symbol in the
2509 procedure linkage table relative to the start of the GOT. */
2510
2511 /* For local symbols or if we didn't make a PLT entry for
2512 this symbol resolve the symbol directly. */
2513 if ( h == NULL
2514 || h->plt.offset == (bfd_vma) -1
2515 || htab->splt == NULL)
2516 {
2517 relocation -= htab->sgot->output_section->vma;
2518 break;
2519 }
2520
2521 relocation = (htab->splt->output_section->vma
2522 + htab->splt->output_offset
2523 + h->plt.offset
2524 - htab->sgot->output_section->vma);
2525 unresolved_reloc = FALSE;
2526 break;
2527
2528 case R_390_8:
2529 case R_390_16:
2530 case R_390_32:
2531 case R_390_64:
2532 case R_390_PC16:
2533 case R_390_PC16DBL:
2534 case R_390_PC32:
2535 case R_390_PC32DBL:
2536 case R_390_PC64:
2537 /* r_symndx will be zero only for relocs against symbols
2538 from removed linkonce sections, or sections discarded by
2539 a linker script. */
2540 if (r_symndx == 0
2541 || (input_section->flags & SEC_ALLOC) == 0)
2542 break;
2543
2544 if ((info->shared
2545 && (h == NULL
2546 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2547 || h->root.type != bfd_link_hash_undefweak)
2548 && ((r_type != R_390_PC16
2549 && r_type != R_390_PC16DBL
2550 && r_type != R_390_PC32
2551 && r_type != R_390_PC32DBL
2552 && r_type != R_390_PC64)
2553 || (h != NULL
2554 && !SYMBOL_REFERENCES_LOCAL (info, h))))
2555 || (ELIMINATE_COPY_RELOCS
2556 && !info->shared
2557 && h != NULL
2558 && h->dynindx != -1
2559 && !h->non_got_ref
2560 && ((h->def_dynamic
2561 && !h->def_regular)
2562 || h->root.type == bfd_link_hash_undefweak
2563 || h->root.type == bfd_link_hash_undefined)))
2564 {
2565 Elf_Internal_Rela outrel;
2566 bfd_boolean skip, relocate;
2567 asection *sreloc;
2568 bfd_byte *loc;
2569
2570 /* When generating a shared object, these relocations
2571 are copied into the output file to be resolved at run
2572 time. */
2573 skip = FALSE;
2574 relocate = FALSE;
2575
2576 outrel.r_offset =
2577 _bfd_elf_section_offset (output_bfd, info, input_section,
2578 rel->r_offset);
2579 if (outrel.r_offset == (bfd_vma) -1)
2580 skip = TRUE;
2581 else if (outrel.r_offset == (bfd_vma) -2)
2582 skip = TRUE, relocate = TRUE;
2583
2584 outrel.r_offset += (input_section->output_section->vma
2585 + input_section->output_offset);
2586
2587 if (skip)
2588 memset (&outrel, 0, sizeof outrel);
2589 else if (h != NULL
2590 && h->dynindx != -1
2591 && (r_type == R_390_PC16
2592 || r_type == R_390_PC16DBL
2593 || r_type == R_390_PC32
2594 || r_type == R_390_PC32DBL
2595 || r_type == R_390_PC64
2596 || !info->shared
2597 || !info->symbolic
2598 || !h->def_regular))
2599 {
2600 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2601 outrel.r_addend = rel->r_addend;
2602 }
2603 else
2604 {
2605 /* This symbol is local, or marked to become local. */
2606 outrel.r_addend = relocation + rel->r_addend;
2607 if (r_type == R_390_64)
2608 {
2609 relocate = TRUE;
2610 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2611 }
2612 else
2613 {
2614 long sindx;
2615
2616 if (bfd_is_abs_section (sec))
2617 sindx = 0;
2618 else if (sec == NULL || sec->owner == NULL)
2619 {
2620 bfd_set_error(bfd_error_bad_value);
2621 return FALSE;
2622 }
2623 else
2624 {
2625 asection *osec;
2626
2627 osec = sec->output_section;
2628 sindx = elf_section_data (osec)->dynindx;
2629 BFD_ASSERT (sindx > 0);
2630
2631 /* We are turning this relocation into one
2632 against a section symbol, so subtract out
2633 the output section's address but not the
2634 offset of the input section in the output
2635 section. */
2636
2637 outrel.r_addend -= osec->vma;
2638 }
2639 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2640 }
2641 }
2642
2643 sreloc = elf_section_data (input_section)->sreloc;
2644 if (sreloc == NULL)
2645 abort ();
2646
2647 loc = sreloc->contents;
2648 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2649 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2650
2651 /* If this reloc is against an external symbol, we do
2652 not want to fiddle with the addend. Otherwise, we
2653 need to include the symbol value so that it becomes
2654 an addend for the dynamic reloc. */
2655 if (! relocate)
2656 continue;
2657 }
2658
2659 break;
2660
2661 /* Relocations for tls literal pool entries. */
2662 case R_390_TLS_IE64:
2663 if (info->shared)
2664 {
2665 Elf_Internal_Rela outrel;
2666 asection *sreloc;
2667 bfd_byte *loc;
2668
2669 outrel.r_offset = rel->r_offset
2670 + input_section->output_section->vma
2671 + input_section->output_offset;
2672 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2673 sreloc = elf_section_data (input_section)->sreloc;
2674 if (sreloc == NULL)
2675 abort ();
2676 loc = sreloc->contents;
2677 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2678 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2679 }
2680 /* Fall through. */
2681
2682 case R_390_TLS_GD64:
2683 case R_390_TLS_GOTIE64:
2684 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2685 tls_type = GOT_UNKNOWN;
2686 if (h == NULL && local_got_offsets)
2687 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2688 else if (h != NULL)
2689 {
2690 tls_type = elf_s390_hash_entry(h)->tls_type;
2691 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2692 r_type = R_390_TLS_LE64;
2693 }
2694 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2695 r_type = R_390_TLS_IE64;
2696
2697 if (r_type == R_390_TLS_LE64)
2698 {
2699 /* This relocation gets optimized away by the local exec
2700 access optimization. */
2701 BFD_ASSERT (! unresolved_reloc);
2702 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2703 contents + rel->r_offset);
2704 continue;
2705 }
2706
2707 if (htab->sgot == NULL)
2708 abort ();
2709
2710 if (h != NULL)
2711 off = h->got.offset;
2712 else
2713 {
2714 if (local_got_offsets == NULL)
2715 abort ();
2716
2717 off = local_got_offsets[r_symndx];
2718 }
2719
2720 emit_tls_relocs:
2721
2722 if ((off & 1) != 0)
2723 off &= ~1;
2724 else
2725 {
2726 Elf_Internal_Rela outrel;
2727 bfd_byte *loc;
2728 int dr_type, indx;
2729
2730 if (htab->srelgot == NULL)
2731 abort ();
2732
2733 outrel.r_offset = (htab->sgot->output_section->vma
2734 + htab->sgot->output_offset + off);
2735
2736 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2737 if (r_type == R_390_TLS_GD64)
2738 dr_type = R_390_TLS_DTPMOD;
2739 else
2740 dr_type = R_390_TLS_TPOFF;
2741 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2742 outrel.r_addend = relocation - dtpoff_base (info);
2743 else
2744 outrel.r_addend = 0;
2745 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2746 loc = htab->srelgot->contents;
2747 loc += htab->srelgot->reloc_count++
2748 * sizeof (Elf64_External_Rela);
2749 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2750
2751 if (r_type == R_390_TLS_GD64)
2752 {
2753 if (indx == 0)
2754 {
2755 BFD_ASSERT (! unresolved_reloc);
2756 bfd_put_64 (output_bfd,
2757 relocation - dtpoff_base (info),
2758 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2759 }
2760 else
2761 {
2762 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
2763 outrel.r_offset += GOT_ENTRY_SIZE;
2764 outrel.r_addend = 0;
2765 htab->srelgot->reloc_count++;
2766 loc += sizeof (Elf64_External_Rela);
2767 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2768 }
2769 }
2770
2771 if (h != NULL)
2772 h->got.offset |= 1;
2773 else
2774 local_got_offsets[r_symndx] |= 1;
2775 }
2776
2777 if (off >= (bfd_vma) -2)
2778 abort ();
2779 if (r_type == ELF64_R_TYPE (rel->r_info))
2780 {
2781 relocation = htab->sgot->output_offset + off;
2782 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
2783 relocation += htab->sgot->output_section->vma;
2784 unresolved_reloc = FALSE;
2785 }
2786 else
2787 {
2788 bfd_put_64 (output_bfd, htab->sgot->output_offset + off,
2789 contents + rel->r_offset);
2790 continue;
2791 }
2792 break;
2793
2794 case R_390_TLS_GOTIE12:
2795 case R_390_TLS_GOTIE20:
2796 case R_390_TLS_IEENT:
2797 if (h == NULL)
2798 {
2799 if (local_got_offsets == NULL)
2800 abort();
2801 off = local_got_offsets[r_symndx];
2802 if (info->shared)
2803 goto emit_tls_relocs;
2804 }
2805 else
2806 {
2807 off = h->got.offset;
2808 tls_type = elf_s390_hash_entry(h)->tls_type;
2809 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2810 goto emit_tls_relocs;
2811 }
2812
2813 if (htab->sgot == NULL)
2814 abort ();
2815
2816 BFD_ASSERT (! unresolved_reloc);
2817 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2818 htab->sgot->contents + off);
2819 relocation = htab->sgot->output_offset + off;
2820 if (r_type == R_390_TLS_IEENT)
2821 relocation += htab->sgot->output_section->vma;
2822 unresolved_reloc = FALSE;
2823 break;
2824
2825 case R_390_TLS_LDM64:
2826 if (! info->shared)
2827 /* The literal pool entry this relocation refers to gets ignored
2828 by the optimized code of the local exec model. Do nothing
2829 and the value will turn out zero. */
2830 continue;
2831
2832 if (htab->sgot == NULL)
2833 abort ();
2834
2835 off = htab->tls_ldm_got.offset;
2836 if (off & 1)
2837 off &= ~1;
2838 else
2839 {
2840 Elf_Internal_Rela outrel;
2841 bfd_byte *loc;
2842
2843 if (htab->srelgot == NULL)
2844 abort ();
2845
2846 outrel.r_offset = (htab->sgot->output_section->vma
2847 + htab->sgot->output_offset + off);
2848
2849 bfd_put_64 (output_bfd, 0,
2850 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2851 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
2852 outrel.r_addend = 0;
2853 loc = htab->srelgot->contents;
2854 loc += htab->srelgot->reloc_count++
2855 * sizeof (Elf64_External_Rela);
2856 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2857 htab->tls_ldm_got.offset |= 1;
2858 }
2859 relocation = htab->sgot->output_offset + off;
2860 unresolved_reloc = FALSE;
2861 break;
2862
2863 case R_390_TLS_LE64:
2864 if (info->shared)
2865 {
2866 /* Linking a shared library with non-fpic code requires
2867 a R_390_TLS_TPOFF relocation. */
2868 Elf_Internal_Rela outrel;
2869 asection *sreloc;
2870 bfd_byte *loc;
2871 int indx;
2872
2873 outrel.r_offset = rel->r_offset
2874 + input_section->output_section->vma
2875 + input_section->output_offset;
2876 if (h != NULL && h->dynindx != -1)
2877 indx = h->dynindx;
2878 else
2879 indx = 0;
2880 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
2881 if (indx == 0)
2882 outrel.r_addend = relocation - dtpoff_base (info);
2883 else
2884 outrel.r_addend = 0;
2885 sreloc = elf_section_data (input_section)->sreloc;
2886 if (sreloc == NULL)
2887 abort ();
2888 loc = sreloc->contents;
2889 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2890 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2891 }
2892 else
2893 {
2894 BFD_ASSERT (! unresolved_reloc);
2895 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2896 contents + rel->r_offset);
2897 }
2898 continue;
2899
2900 case R_390_TLS_LDO64:
2901 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2902 relocation -= dtpoff_base (info);
2903 else
2904 /* When converting LDO to LE, we must negate. */
2905 relocation = -tpoff (info, relocation);
2906 break;
2907
2908 /* Relocations for tls instructions. */
2909 case R_390_TLS_LOAD:
2910 case R_390_TLS_GDCALL:
2911 case R_390_TLS_LDCALL:
2912 tls_type = GOT_UNKNOWN;
2913 if (h == NULL && local_got_offsets)
2914 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2915 else if (h != NULL)
2916 tls_type = elf_s390_hash_entry(h)->tls_type;
2917
2918 if (tls_type == GOT_TLS_GD)
2919 continue;
2920
2921 if (r_type == R_390_TLS_LOAD)
2922 {
2923 if (!info->shared && (h == NULL || h->dynindx == -1))
2924 {
2925 /* IE->LE transition. Four valid cases:
2926 lg %rx,(0,%ry) -> sllg %rx,%ry,0
2927 lg %rx,(%ry,0) -> sllg %rx,%ry,0
2928 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
2929 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
2930 unsigned int insn0, insn1, ry;
2931
2932 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2933 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2934 if (insn1 != 0x0004)
2935 invalid_tls_insn (input_bfd, input_section, rel);
2936 ry = 0;
2937 if ((insn0 & 0xff00f000) == 0xe3000000)
2938 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
2939 ry = (insn0 & 0x000f0000);
2940 else if ((insn0 & 0xff0f0000) == 0xe3000000)
2941 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
2942 ry = (insn0 & 0x0000f000) << 4;
2943 else if ((insn0 & 0xff00f000) == 0xe300c000)
2944 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
2945 ry = (insn0 & 0x000f0000);
2946 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
2947 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
2948 ry = (insn0 & 0x0000f000) << 4;
2949 else
2950 invalid_tls_insn (input_bfd, input_section, rel);
2951 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
2952 insn1 = 0x000d;
2953 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2954 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2955 }
2956 }
2957 else if (r_type == R_390_TLS_GDCALL)
2958 {
2959 unsigned int insn0, insn1;
2960
2961 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2962 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2963 if ((insn0 & 0xffff0000) != 0xc0e50000)
2964 invalid_tls_insn (input_bfd, input_section, rel);
2965 if (!info->shared && (h == NULL || h->dynindx == -1))
2966 {
2967 /* GD->LE transition.
2968 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2969 insn0 = 0xc0040000;
2970 insn1 = 0x0000;
2971 }
2972 else
2973 {
2974 /* GD->IE transition.
2975 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
2976 insn0 = 0xe322c000;
2977 insn1 = 0x0004;
2978 }
2979 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2980 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2981 }
2982 else if (r_type == R_390_TLS_LDCALL)
2983 {
2984 if (!info->shared)
2985 {
2986 unsigned int insn0, insn1;
2987
2988 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2989 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2990 if ((insn0 & 0xffff0000) != 0xc0e50000)
2991 invalid_tls_insn (input_bfd, input_section, rel);
2992 /* LD->LE transition.
2993 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2994 insn0 = 0xc0040000;
2995 insn1 = 0x0000;
2996 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2997 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2998 }
2999 }
3000 continue;
3001
3002 default:
3003 break;
3004 }
3005
3006 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3007 because such sections are not SEC_ALLOC and thus ld.so will
3008 not process them. */
3009 if (unresolved_reloc
3010 && !((input_section->flags & SEC_DEBUGGING) != 0
3011 && h->def_dynamic))
3012 (*_bfd_error_handler)
3013 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3014 input_bfd,
3015 input_section,
3016 (long) rel->r_offset,
3017 howto->name,
3018 h->root.root.string);
3019
3020 if (r_type == R_390_20
3021 || r_type == R_390_GOT20
3022 || r_type == R_390_GOTPLT20
3023 || r_type == R_390_TLS_GOTIE20)
3024 {
3025 relocation += rel->r_addend;
3026 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3027 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3028 contents, rel->r_offset,
3029 relocation, 0);
3030 }
3031 else
3032 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3033 contents, rel->r_offset,
3034 relocation, rel->r_addend);
3035
3036 if (r != bfd_reloc_ok)
3037 {
3038 const char *name;
3039
3040 if (h != NULL)
3041 name = h->root.root.string;
3042 else
3043 {
3044 name = bfd_elf_string_from_elf_section (input_bfd,
3045 symtab_hdr->sh_link,
3046 sym->st_name);
3047 if (name == NULL)
3048 return FALSE;
3049 if (*name == '\0')
3050 name = bfd_section_name (input_bfd, sec);
3051 }
3052
3053 if (r == bfd_reloc_overflow)
3054 {
3055
3056 if (! ((*info->callbacks->reloc_overflow)
3057 (info, (h ? &h->root : NULL), name, howto->name,
3058 (bfd_vma) 0, input_bfd, input_section,
3059 rel->r_offset)))
3060 return FALSE;
3061 }
3062 else
3063 {
3064 (*_bfd_error_handler)
3065 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3066 input_bfd, input_section,
3067 (long) rel->r_offset, name, (int) r);
3068 return FALSE;
3069 }
3070 }
3071 }
3072
3073 return TRUE;
3074 }
3075
3076 /* Finish up dynamic symbol handling. We set the contents of various
3077 dynamic sections here. */
3078
3079 static bfd_boolean
3080 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3081 bfd *output_bfd;
3082 struct bfd_link_info *info;
3083 struct elf_link_hash_entry *h;
3084 Elf_Internal_Sym *sym;
3085 {
3086 struct elf_s390_link_hash_table *htab;
3087
3088 htab = elf_s390_hash_table (info);
3089
3090 if (h->plt.offset != (bfd_vma) -1)
3091 {
3092 bfd_vma plt_index;
3093 bfd_vma got_offset;
3094 Elf_Internal_Rela rela;
3095 bfd_byte *loc;
3096
3097 /* This symbol has an entry in the procedure linkage table. Set
3098 it up. */
3099
3100 if (h->dynindx == -1
3101 || htab->splt == NULL
3102 || htab->sgotplt == NULL
3103 || htab->srelplt == NULL)
3104 abort ();
3105
3106 /* Calc. index no.
3107 Current offset - size first entry / entry size. */
3108 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3109
3110 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
3111 addr & GOT addr. */
3112 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3113
3114 /* Fill in the blueprint of a PLT. */
3115 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3116 htab->splt->contents + h->plt.offset);
3117 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3118 htab->splt->contents + h->plt.offset + 4);
3119 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3120 htab->splt->contents + h->plt.offset + 8);
3121 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3122 htab->splt->contents + h->plt.offset + 12);
3123 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3124 htab->splt->contents + h->plt.offset + 16);
3125 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5,
3126 htab->splt->contents + h->plt.offset + 20);
3127 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6,
3128 htab->splt->contents + h->plt.offset + 24);
3129 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7,
3130 htab->splt->contents + h->plt.offset + 28);
3131 /* Fixup the relative address to the GOT entry */
3132 bfd_put_32 (output_bfd,
3133 (htab->sgotplt->output_section->vma +
3134 htab->sgotplt->output_offset + got_offset
3135 - (htab->splt->output_section->vma + h->plt.offset))/2,
3136 htab->splt->contents + h->plt.offset + 2);
3137 /* Fixup the relative branch to PLT 0 */
3138 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3139 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3140 htab->splt->contents + h->plt.offset + 24);
3141 /* Fixup offset into symbol table */
3142 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3143 htab->splt->contents + h->plt.offset + 28);
3144
3145 /* Fill in the entry in the global offset table.
3146 Points to instruction after GOT offset. */
3147 bfd_put_64 (output_bfd,
3148 (htab->splt->output_section->vma
3149 + htab->splt->output_offset
3150 + h->plt.offset
3151 + 14),
3152 htab->sgotplt->contents + got_offset);
3153
3154 /* Fill in the entry in the .rela.plt section. */
3155 rela.r_offset = (htab->sgotplt->output_section->vma
3156 + htab->sgotplt->output_offset
3157 + got_offset);
3158 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3159 rela.r_addend = 0;
3160 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela);
3161 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3162
3163 if (!h->def_regular)
3164 {
3165 /* Mark the symbol as undefined, rather than as defined in
3166 the .plt section. Leave the value alone. This is a clue
3167 for the dynamic linker, to make function pointer
3168 comparisons work between an application and shared
3169 library. */
3170 sym->st_shndx = SHN_UNDEF;
3171 }
3172 }
3173
3174 if (h->got.offset != (bfd_vma) -1
3175 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3176 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3177 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3178 {
3179 Elf_Internal_Rela rela;
3180 bfd_byte *loc;
3181
3182 /* This symbol has an entry in the global offset table. Set it
3183 up. */
3184 if (htab->sgot == NULL || htab->srelgot == NULL)
3185 abort ();
3186
3187 rela.r_offset = (htab->sgot->output_section->vma
3188 + htab->sgot->output_offset
3189 + (h->got.offset &~ (bfd_vma) 1));
3190
3191 /* If this is a static link, or it is a -Bsymbolic link and the
3192 symbol is defined locally or was forced to be local because
3193 of a version file, we just want to emit a RELATIVE reloc.
3194 The entry in the global offset table will already have been
3195 initialized in the relocate_section function. */
3196 if (info->shared
3197 && (info->symbolic
3198 || h->dynindx == -1
3199 || h->forced_local)
3200 && h->def_regular)
3201 {
3202 BFD_ASSERT((h->got.offset & 1) != 0);
3203 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3204 rela.r_addend = (h->root.u.def.value
3205 + h->root.u.def.section->output_section->vma
3206 + h->root.u.def.section->output_offset);
3207 }
3208 else
3209 {
3210 BFD_ASSERT((h->got.offset & 1) == 0);
3211 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3212 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3213 rela.r_addend = 0;
3214 }
3215
3216 loc = htab->srelgot->contents;
3217 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3218 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3219 }
3220
3221 if (h->needs_copy)
3222 {
3223 Elf_Internal_Rela rela;
3224 bfd_byte *loc;
3225
3226 /* This symbols needs a copy reloc. Set it up. */
3227
3228 if (h->dynindx == -1
3229 || (h->root.type != bfd_link_hash_defined
3230 && h->root.type != bfd_link_hash_defweak)
3231 || htab->srelbss == NULL)
3232 abort ();
3233
3234 rela.r_offset = (h->root.u.def.value
3235 + h->root.u.def.section->output_section->vma
3236 + h->root.u.def.section->output_offset);
3237 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3238 rela.r_addend = 0;
3239 loc = htab->srelbss->contents;
3240 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3241 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3242 }
3243
3244 /* Mark some specially defined symbols as absolute. */
3245 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3246 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
3247 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
3248 sym->st_shndx = SHN_ABS;
3249
3250 return TRUE;
3251 }
3252
3253 /* Used to decide how to sort relocs in an optimal manner for the
3254 dynamic linker, before writing them out. */
3255
3256 static enum elf_reloc_type_class
3257 elf_s390_reloc_type_class (rela)
3258 const Elf_Internal_Rela *rela;
3259 {
3260 switch ((int) ELF64_R_TYPE (rela->r_info))
3261 {
3262 case R_390_RELATIVE:
3263 return reloc_class_relative;
3264 case R_390_JMP_SLOT:
3265 return reloc_class_plt;
3266 case R_390_COPY:
3267 return reloc_class_copy;
3268 default:
3269 return reloc_class_normal;
3270 }
3271 }
3272
3273 /* Finish up the dynamic sections. */
3274
3275 static bfd_boolean
3276 elf_s390_finish_dynamic_sections (output_bfd, info)
3277 bfd *output_bfd;
3278 struct bfd_link_info *info;
3279 {
3280 struct elf_s390_link_hash_table *htab;
3281 bfd *dynobj;
3282 asection *sdyn;
3283
3284 htab = elf_s390_hash_table (info);
3285 dynobj = htab->elf.dynobj;
3286 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3287
3288 if (htab->elf.dynamic_sections_created)
3289 {
3290 Elf64_External_Dyn *dyncon, *dynconend;
3291
3292 if (sdyn == NULL || htab->sgot == NULL)
3293 abort ();
3294
3295 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3296 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3297 for (; dyncon < dynconend; dyncon++)
3298 {
3299 Elf_Internal_Dyn dyn;
3300 asection *s;
3301
3302 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3303
3304 switch (dyn.d_tag)
3305 {
3306 default:
3307 continue;
3308
3309 case DT_PLTGOT:
3310 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3311 break;
3312
3313 case DT_JMPREL:
3314 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3315 break;
3316
3317 case DT_PLTRELSZ:
3318 s = htab->srelplt->output_section;
3319 dyn.d_un.d_val = s->size;
3320 break;
3321
3322 case DT_RELASZ:
3323 /* The procedure linkage table relocs (DT_JMPREL) should
3324 not be included in the overall relocs (DT_RELA).
3325 Therefore, we override the DT_RELASZ entry here to
3326 make it not include the JMPREL relocs. Since the
3327 linker script arranges for .rela.plt to follow all
3328 other relocation sections, we don't have to worry
3329 about changing the DT_RELA entry. */
3330 s = htab->srelplt->output_section;
3331 dyn.d_un.d_val -= s->size;
3332 break;
3333 }
3334
3335 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3336 }
3337
3338 /* Fill in the special first entry in the procedure linkage table. */
3339 if (htab->splt && htab->splt->size > 0)
3340 {
3341 /* fill in blueprint for plt 0 entry */
3342 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0,
3343 htab->splt->contents );
3344 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3345 htab->splt->contents +4 );
3346 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3347 htab->splt->contents +12 );
3348 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3349 htab->splt->contents +16 );
3350 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3351 htab->splt->contents +20 );
3352 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6,
3353 htab->splt->contents + 24);
3354 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7,
3355 htab->splt->contents + 28 );
3356 /* Fixup relative address to start of GOT */
3357 bfd_put_32 (output_bfd,
3358 (htab->sgotplt->output_section->vma +
3359 htab->sgotplt->output_offset
3360 - htab->splt->output_section->vma - 6)/2,
3361 htab->splt->contents + 8);
3362 }
3363 elf_section_data (htab->splt->output_section)
3364 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE;
3365 }
3366
3367 if (htab->sgotplt)
3368 {
3369 /* Fill in the first three entries in the global offset table. */
3370 if (htab->sgotplt->size > 0)
3371 {
3372 bfd_put_64 (output_bfd,
3373 (sdyn == NULL ? (bfd_vma) 0
3374 : sdyn->output_section->vma + sdyn->output_offset),
3375 htab->sgotplt->contents);
3376 /* One entry for shared object struct ptr. */
3377 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3378 /* One entry for _dl_runtime_resolve. */
3379 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12);
3380 }
3381
3382 elf_section_data (htab->sgot->output_section)
3383 ->this_hdr.sh_entsize = 8;
3384 }
3385 return TRUE;
3386 }
3387
3388 /* Return address for Ith PLT stub in section PLT, for relocation REL
3389 or (bfd_vma) -1 if it should not be included. */
3390
3391 static bfd_vma
3392 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3393 const arelent *rel ATTRIBUTE_UNUSED)
3394 {
3395 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3396 }
3397
3398
3399 /* Why was the hash table entry size definition changed from
3400 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3401 this is the only reason for the s390_elf64_size_info structure. */
3402
3403 const struct elf_size_info s390_elf64_size_info =
3404 {
3405 sizeof (Elf64_External_Ehdr),
3406 sizeof (Elf64_External_Phdr),
3407 sizeof (Elf64_External_Shdr),
3408 sizeof (Elf64_External_Rel),
3409 sizeof (Elf64_External_Rela),
3410 sizeof (Elf64_External_Sym),
3411 sizeof (Elf64_External_Dyn),
3412 sizeof (Elf_External_Note),
3413 8, /* hash-table entry size. */
3414 1, /* internal relocations per external relocations. */
3415 64, /* arch_size. */
3416 3, /* log_file_align. */
3417 ELFCLASS64, EV_CURRENT,
3418 bfd_elf64_write_out_phdrs,
3419 bfd_elf64_write_shdrs_and_ehdr,
3420 bfd_elf64_write_relocs,
3421 bfd_elf64_swap_symbol_in,
3422 bfd_elf64_swap_symbol_out,
3423 bfd_elf64_slurp_reloc_table,
3424 bfd_elf64_slurp_symbol_table,
3425 bfd_elf64_swap_dyn_in,
3426 bfd_elf64_swap_dyn_out,
3427 bfd_elf64_swap_reloc_in,
3428 bfd_elf64_swap_reloc_out,
3429 bfd_elf64_swap_reloca_in,
3430 bfd_elf64_swap_reloca_out
3431 };
3432
3433 #define TARGET_BIG_SYM bfd_elf64_s390_vec
3434 #define TARGET_BIG_NAME "elf64-s390"
3435 #define ELF_ARCH bfd_arch_s390
3436 #define ELF_MACHINE_CODE EM_S390
3437 #define ELF_MACHINE_ALT1 EM_S390_OLD
3438 #define ELF_MAXPAGESIZE 0x1000
3439
3440 #define elf_backend_size_info s390_elf64_size_info
3441
3442 #define elf_backend_can_gc_sections 1
3443 #define elf_backend_can_refcount 1
3444 #define elf_backend_want_got_plt 1
3445 #define elf_backend_plt_readonly 1
3446 #define elf_backend_want_plt_sym 0
3447 #define elf_backend_got_header_size 24
3448 #define elf_backend_rela_normal 1
3449
3450 #define elf_info_to_howto elf_s390_info_to_howto
3451
3452 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3453 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3454 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3455
3456 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3457 #define elf_backend_check_relocs elf_s390_check_relocs
3458 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3459 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3460 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3461 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3462 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3463 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3464 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3465 #define elf_backend_relocate_section elf_s390_relocate_section
3466 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3467 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3468 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3469
3470 #define bfd_elf64_mkobject elf_s390_mkobject
3471 #define elf_backend_object_p elf_s390_object_p
3472
3473 #include "elf64-target.h"
GDB Binutils - Deliverables
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