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Better handking for unresolved symbols
[binutils.git] / bfd / elf64-s390.c
blobde712f77e3b9ec92e1b99c7feb72ab3538134f6c
1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
3 Contributed Martin Schwidefsky (schwidefsky@de.ibm.com).
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
20 02111-1307, USA. */
21
22 #include "bfd.h"
23 #include "sysdep.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27
28 static reloc_howto_type *elf_s390_reloc_type_lookup
29 PARAMS ((bfd *, bfd_reloc_code_real_type));
30 static void elf_s390_info_to_howto
31 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
32 static bfd_boolean elf_s390_is_local_label_name
33 PARAMS ((bfd *, const char *));
34 static struct bfd_hash_entry *link_hash_newfunc
35 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
36 static struct bfd_link_hash_table *elf_s390_link_hash_table_create
37 PARAMS ((bfd *));
38 static bfd_boolean create_got_section
39 PARAMS((bfd *, struct bfd_link_info *));
40 static bfd_boolean elf_s390_create_dynamic_sections
41 PARAMS((bfd *, struct bfd_link_info *));
42 static void elf_s390_copy_indirect_symbol
43 PARAMS ((const struct elf_backend_data *, struct elf_link_hash_entry *,
44 struct elf_link_hash_entry *));
45 static bfd_boolean elf_s390_check_relocs
46 PARAMS ((bfd *, struct bfd_link_info *, asection *,
47 const Elf_Internal_Rela *));
48 static asection *elf_s390_gc_mark_hook
49 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
50 struct elf_link_hash_entry *, Elf_Internal_Sym *));
51 static bfd_boolean elf_s390_gc_sweep_hook
52 PARAMS ((bfd *, struct bfd_link_info *, asection *,
53 const Elf_Internal_Rela *));
54 struct elf_s390_link_hash_entry;
55 static void elf_s390_adjust_gotplt
56 PARAMS ((struct elf_s390_link_hash_entry *));
57 static bfd_boolean elf_s390_adjust_dynamic_symbol
58 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
59 static bfd_boolean allocate_dynrelocs
60 PARAMS ((struct elf_link_hash_entry *, PTR));
61 static bfd_boolean readonly_dynrelocs
62 PARAMS ((struct elf_link_hash_entry *, PTR));
63 static bfd_boolean elf_s390_size_dynamic_sections
64 PARAMS ((bfd *, struct bfd_link_info *));
65 static bfd_boolean elf_s390_relocate_section
66 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
67 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
68 static bfd_boolean elf_s390_finish_dynamic_symbol
69 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
70 Elf_Internal_Sym *));
71 static enum elf_reloc_type_class elf_s390_reloc_type_class
72 PARAMS ((const Elf_Internal_Rela *));
73 static bfd_boolean elf_s390_finish_dynamic_sections
74 PARAMS ((bfd *, struct bfd_link_info *));
75 static bfd_boolean elf_s390_mkobject
76 PARAMS ((bfd *));
77 static bfd_boolean elf_s390_object_p
78 PARAMS ((bfd *));
79 static int elf_s390_tls_transition
80 PARAMS ((struct bfd_link_info *, int, int));
81 static bfd_reloc_status_type s390_tls_reloc
82 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
83 static bfd_vma dtpoff_base
84 PARAMS ((struct bfd_link_info *));
85 static bfd_vma tpoff
86 PARAMS ((struct bfd_link_info *, bfd_vma));
87 static void invalid_tls_insn
88 PARAMS ((bfd *, asection *, Elf_Internal_Rela *));
89 static bfd_reloc_status_type s390_elf_ldisp_reloc
90 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
91
92 #include "elf/s390.h"
93
94 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
95 from smaller values. Start with zero, widen, *then* decrement. */
96 #define MINUS_ONE (((bfd_vma)0) - 1)
97
98 /* The relocation "howto" table. */
99 static reloc_howto_type elf_howto_table[] =
100 {
101 HOWTO (R_390_NONE, /* type */
102 0, /* rightshift */
103 0, /* size (0 = byte, 1 = short, 2 = long) */
104 0, /* bitsize */
105 FALSE, /* pc_relative */
106 0, /* bitpos */
107 complain_overflow_dont, /* complain_on_overflow */
108 bfd_elf_generic_reloc, /* special_function */
109 "R_390_NONE", /* name */
110 FALSE, /* partial_inplace */
111 0, /* src_mask */
112 0, /* dst_mask */
113 FALSE), /* pcrel_offset */
114
115 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
116 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
117 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
118 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
119 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
121 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
123 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
125 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
127 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
129 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
131 HOWTO(R_390_COPY, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,MINUS_ONE, FALSE),
133 HOWTO(R_390_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
134 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,MINUS_ONE, FALSE),
135 HOWTO(R_390_JMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
136 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,MINUS_ONE, FALSE),
137 HOWTO(R_390_RELATIVE, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,MINUS_ONE, FALSE),
139 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
140 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,MINUS_ONE, FALSE),
141 HOWTO(R_390_GOTPC, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
142 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,MINUS_ONE, TRUE),
143 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
145 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
146 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
147 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
148 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
149 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
150 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
151 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
152 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
153 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
154 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
155 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
156 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,MINUS_ONE, TRUE),
157 HOWTO(R_390_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
158 bfd_elf_generic_reloc, "R_390_64", FALSE, 0,MINUS_ONE, FALSE),
159 HOWTO(R_390_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
160 bfd_elf_generic_reloc, "R_390_PC64", FALSE, 0,MINUS_ONE, TRUE),
161 HOWTO(R_390_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
162 bfd_elf_generic_reloc, "R_390_GOT64", FALSE, 0,MINUS_ONE, FALSE),
163 HOWTO(R_390_PLT64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
164 bfd_elf_generic_reloc, "R_390_PLT64", FALSE, 0,MINUS_ONE, TRUE),
165 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
166 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,MINUS_ONE, TRUE),
167 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
168 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
169 HOWTO(R_390_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
170 bfd_elf_generic_reloc, "R_390_GOTOFF64", FALSE, 0,MINUS_ONE, FALSE),
171 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
172 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
173 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
174 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
175 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
176 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
177 HOWTO(R_390_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
178 bfd_elf_generic_reloc, "R_390_GOTPLT64", FALSE, 0,MINUS_ONE, FALSE),
179 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
180 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,MINUS_ONE, TRUE),
181 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
182 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
183 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
184 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
185 HOWTO(R_390_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
186 bfd_elf_generic_reloc, "R_390_PLTOFF64", FALSE, 0,MINUS_ONE, FALSE),
187 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont,
188 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE),
189 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
190 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE),
191 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
192 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE),
193 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */
194 HOWTO(R_390_TLS_GD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
195 bfd_elf_generic_reloc, "R_390_TLS_GD64", FALSE, 0, MINUS_ONE, FALSE),
196 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
197 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE),
198 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */
199 HOWTO(R_390_TLS_GOTIE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
200 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", FALSE, 0, MINUS_ONE, FALSE),
201 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */
202 HOWTO(R_390_TLS_LDM64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
203 bfd_elf_generic_reloc, "R_390_TLS_LDM64", FALSE, 0, MINUS_ONE, FALSE),
204 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */
205 HOWTO(R_390_TLS_IE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
206 bfd_elf_generic_reloc, "R_390_TLS_IE64", FALSE, 0, MINUS_ONE, FALSE),
207 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
208 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, MINUS_ONE, TRUE),
209 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */
210 HOWTO(R_390_TLS_LE64, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
211 bfd_elf_generic_reloc, "R_390_TLS_LE64", FALSE, 0, MINUS_ONE, FALSE),
212 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */
213 HOWTO(R_390_TLS_LDO64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
214 bfd_elf_generic_reloc, "R_390_TLS_LDO64", FALSE, 0, MINUS_ONE, FALSE),
215 HOWTO(R_390_TLS_DTPMOD, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
216 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, MINUS_ONE, FALSE),
217 HOWTO(R_390_TLS_DTPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
218 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, MINUS_ONE, FALSE),
219 HOWTO(R_390_TLS_TPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
220 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, MINUS_ONE, FALSE),
221 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
222 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE),
223 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
224 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE),
225 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
226 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE),
227 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
228 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE),
229 };
230
231 /* GNU extension to record C++ vtable hierarchy. */
232 static reloc_howto_type elf64_s390_vtinherit_howto =
233 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
234 static reloc_howto_type elf64_s390_vtentry_howto =
235 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);
236
237 static reloc_howto_type *
238 elf_s390_reloc_type_lookup (abfd, code)
239 bfd *abfd ATTRIBUTE_UNUSED;
240 bfd_reloc_code_real_type code;
241 {
242 switch (code)
243 {
244 case BFD_RELOC_NONE:
245 return &elf_howto_table[(int) R_390_NONE];
246 case BFD_RELOC_8:
247 return &elf_howto_table[(int) R_390_8];
248 case BFD_RELOC_390_12:
249 return &elf_howto_table[(int) R_390_12];
250 case BFD_RELOC_16:
251 return &elf_howto_table[(int) R_390_16];
252 case BFD_RELOC_32:
253 return &elf_howto_table[(int) R_390_32];
254 case BFD_RELOC_CTOR:
255 return &elf_howto_table[(int) R_390_32];
256 case BFD_RELOC_32_PCREL:
257 return &elf_howto_table[(int) R_390_PC32];
258 case BFD_RELOC_390_GOT12:
259 return &elf_howto_table[(int) R_390_GOT12];
260 case BFD_RELOC_32_GOT_PCREL:
261 return &elf_howto_table[(int) R_390_GOT32];
262 case BFD_RELOC_390_PLT32:
263 return &elf_howto_table[(int) R_390_PLT32];
264 case BFD_RELOC_390_COPY:
265 return &elf_howto_table[(int) R_390_COPY];
266 case BFD_RELOC_390_GLOB_DAT:
267 return &elf_howto_table[(int) R_390_GLOB_DAT];
268 case BFD_RELOC_390_JMP_SLOT:
269 return &elf_howto_table[(int) R_390_JMP_SLOT];
270 case BFD_RELOC_390_RELATIVE:
271 return &elf_howto_table[(int) R_390_RELATIVE];
272 case BFD_RELOC_32_GOTOFF:
273 return &elf_howto_table[(int) R_390_GOTOFF32];
274 case BFD_RELOC_390_GOTPC:
275 return &elf_howto_table[(int) R_390_GOTPC];
276 case BFD_RELOC_390_GOT16:
277 return &elf_howto_table[(int) R_390_GOT16];
278 case BFD_RELOC_16_PCREL:
279 return &elf_howto_table[(int) R_390_PC16];
280 case BFD_RELOC_390_PC16DBL:
281 return &elf_howto_table[(int) R_390_PC16DBL];
282 case BFD_RELOC_390_PLT16DBL:
283 return &elf_howto_table[(int) R_390_PLT16DBL];
284 case BFD_RELOC_390_PC32DBL:
285 return &elf_howto_table[(int) R_390_PC32DBL];
286 case BFD_RELOC_390_PLT32DBL:
287 return &elf_howto_table[(int) R_390_PLT32DBL];
288 case BFD_RELOC_390_GOTPCDBL:
289 return &elf_howto_table[(int) R_390_GOTPCDBL];
290 case BFD_RELOC_64:
291 return &elf_howto_table[(int) R_390_64];
292 case BFD_RELOC_64_PCREL:
293 return &elf_howto_table[(int) R_390_PC64];
294 case BFD_RELOC_390_GOT64:
295 return &elf_howto_table[(int) R_390_GOT64];
296 case BFD_RELOC_390_PLT64:
297 return &elf_howto_table[(int) R_390_PLT64];
298 case BFD_RELOC_390_GOTENT:
299 return &elf_howto_table[(int) R_390_GOTENT];
300 case BFD_RELOC_16_GOTOFF:
301 return &elf_howto_table[(int) R_390_GOTOFF16];
302 case BFD_RELOC_390_GOTOFF64:
303 return &elf_howto_table[(int) R_390_GOTOFF64];
304 case BFD_RELOC_390_GOTPLT12:
305 return &elf_howto_table[(int) R_390_GOTPLT12];
306 case BFD_RELOC_390_GOTPLT16:
307 return &elf_howto_table[(int) R_390_GOTPLT16];
308 case BFD_RELOC_390_GOTPLT32:
309 return &elf_howto_table[(int) R_390_GOTPLT32];
310 case BFD_RELOC_390_GOTPLT64:
311 return &elf_howto_table[(int) R_390_GOTPLT64];
312 case BFD_RELOC_390_GOTPLTENT:
313 return &elf_howto_table[(int) R_390_GOTPLTENT];
314 case BFD_RELOC_390_PLTOFF16:
315 return &elf_howto_table[(int) R_390_PLTOFF16];
316 case BFD_RELOC_390_PLTOFF32:
317 return &elf_howto_table[(int) R_390_PLTOFF32];
318 case BFD_RELOC_390_PLTOFF64:
319 return &elf_howto_table[(int) R_390_PLTOFF64];
320 case BFD_RELOC_390_TLS_LOAD:
321 return &elf_howto_table[(int) R_390_TLS_LOAD];
322 case BFD_RELOC_390_TLS_GDCALL:
323 return &elf_howto_table[(int) R_390_TLS_GDCALL];
324 case BFD_RELOC_390_TLS_LDCALL:
325 return &elf_howto_table[(int) R_390_TLS_LDCALL];
326 case BFD_RELOC_390_TLS_GD64:
327 return &elf_howto_table[(int) R_390_TLS_GD64];
328 case BFD_RELOC_390_TLS_GOTIE12:
329 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
330 case BFD_RELOC_390_TLS_GOTIE64:
331 return &elf_howto_table[(int) R_390_TLS_GOTIE64];
332 case BFD_RELOC_390_TLS_LDM64:
333 return &elf_howto_table[(int) R_390_TLS_LDM64];
334 case BFD_RELOC_390_TLS_IE64:
335 return &elf_howto_table[(int) R_390_TLS_IE64];
336 case BFD_RELOC_390_TLS_IEENT:
337 return &elf_howto_table[(int) R_390_TLS_IEENT];
338 case BFD_RELOC_390_TLS_LE64:
339 return &elf_howto_table[(int) R_390_TLS_LE64];
340 case BFD_RELOC_390_TLS_LDO64:
341 return &elf_howto_table[(int) R_390_TLS_LDO64];
342 case BFD_RELOC_390_TLS_DTPMOD:
343 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
344 case BFD_RELOC_390_TLS_DTPOFF:
345 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
346 case BFD_RELOC_390_TLS_TPOFF:
347 return &elf_howto_table[(int) R_390_TLS_TPOFF];
348 case BFD_RELOC_390_20:
349 return &elf_howto_table[(int) R_390_20];
350 case BFD_RELOC_390_GOT20:
351 return &elf_howto_table[(int) R_390_GOT20];
352 case BFD_RELOC_390_GOTPLT20:
353 return &elf_howto_table[(int) R_390_GOTPLT20];
354 case BFD_RELOC_390_TLS_GOTIE20:
355 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
356 case BFD_RELOC_VTABLE_INHERIT:
357 return &elf64_s390_vtinherit_howto;
358 case BFD_RELOC_VTABLE_ENTRY:
359 return &elf64_s390_vtentry_howto;
360 default:
361 break;
362 }
363 return 0;
364 }
365
366 /* We need to use ELF64_R_TYPE so we have our own copy of this function,
367 and elf64-s390.c has its own copy. */
368
369 static void
370 elf_s390_info_to_howto (abfd, cache_ptr, dst)
371 bfd *abfd ATTRIBUTE_UNUSED;
372 arelent *cache_ptr;
373 Elf_Internal_Rela *dst;
374 {
375 switch (ELF64_R_TYPE(dst->r_info))
376 {
377 case R_390_GNU_VTINHERIT:
378 cache_ptr->howto = &elf64_s390_vtinherit_howto;
379 break;
380
381 case R_390_GNU_VTENTRY:
382 cache_ptr->howto = &elf64_s390_vtentry_howto;
383 break;
384
385 default:
386 BFD_ASSERT (ELF64_R_TYPE(dst->r_info) < (unsigned int) R_390_max);
387 cache_ptr->howto = &elf_howto_table[ELF64_R_TYPE(dst->r_info)];
388 }
389 }
390
391 /* A relocation function which doesn't do anything. */
392 static bfd_reloc_status_type
393 s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section,
394 output_bfd, error_message)
395 bfd *abfd ATTRIBUTE_UNUSED;
396 arelent *reloc_entry;
397 asymbol *symbol ATTRIBUTE_UNUSED;
398 PTR data ATTRIBUTE_UNUSED;
399 asection *input_section;
400 bfd *output_bfd;
401 char **error_message ATTRIBUTE_UNUSED;
402 {
403 if (output_bfd)
404 reloc_entry->address += input_section->output_offset;
405 return bfd_reloc_ok;
406 }
407
408 /* Handle the large displacement relocs. */
409 static bfd_reloc_status_type
410 s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section,
411 output_bfd, error_message)
412 bfd *abfd;
413 arelent *reloc_entry;
414 asymbol *symbol;
415 PTR data;
416 asection *input_section;
417 bfd *output_bfd;
418 char **error_message ATTRIBUTE_UNUSED;
419 {
420 reloc_howto_type *howto = reloc_entry->howto;
421 bfd_vma relocation;
422 bfd_vma insn;
423
424 if (output_bfd != (bfd *) NULL
425 && (symbol->flags & BSF_SECTION_SYM) == 0
426 && (! howto->partial_inplace
427 || reloc_entry->addend == 0))
428 {
429 reloc_entry->address += input_section->output_offset;
430 return bfd_reloc_ok;
431 }
432 if (output_bfd != NULL)
433 return bfd_reloc_continue;
434
435 if (reloc_entry->address > input_section->_cooked_size)
436 return bfd_reloc_outofrange;
437
438 relocation = (symbol->value
439 + symbol->section->output_section->vma
440 + symbol->section->output_offset);
441 relocation += reloc_entry->addend;
442 if (howto->pc_relative)
443 {
444 relocation -= (input_section->output_section->vma
445 + input_section->output_offset);
446 relocation -= reloc_entry->address;
447 }
448
449 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
450 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
451 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
452
453 if ((bfd_signed_vma) relocation < - 0x80000
454 || (bfd_signed_vma) relocation > 0x7ffff)
455 return bfd_reloc_overflow;
456 else
457 return bfd_reloc_ok;
458 }
459
460 static bfd_boolean
461 elf_s390_is_local_label_name (abfd, name)
462 bfd *abfd;
463 const char *name;
464 {
465 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
466 return TRUE;
467
468 return _bfd_elf_is_local_label_name (abfd, name);
469 }
470
471 /* Functions for the 390 ELF linker. */
472
473 /* The name of the dynamic interpreter. This is put in the .interp
474 section. */
475
476 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
477
478 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
479 copying dynamic variables from a shared lib into an app's dynbss
480 section, and instead use a dynamic relocation to point into the
481 shared lib. */
482 #define ELIMINATE_COPY_RELOCS 1
483
484 /* The size in bytes of the first entry in the procedure linkage table. */
485 #define PLT_FIRST_ENTRY_SIZE 32
486 /* The size in bytes of an entry in the procedure linkage table. */
487 #define PLT_ENTRY_SIZE 32
488
489 #define GOT_ENTRY_SIZE 8
490
491 /* The first three entries in a procedure linkage table are reserved,
492 and the initial contents are unimportant (we zero them out).
493 Subsequent entries look like this. See the SVR4 ABI 386
494 supplement to see how this works. */
495
496 /* For the s390, simple addr offset can only be 0 - 4096.
497 To use the full 16777216 TB address space, several instructions
498 are needed to load an address in a register and execute
499 a branch( or just saving the address)
500
501 Furthermore, only r 0 and 1 are free to use!!! */
502
503 /* The first 3 words in the GOT are then reserved.
504 Word 0 is the address of the dynamic table.
505 Word 1 is a pointer to a structure describing the object
506 Word 2 is used to point to the loader entry address.
507
508 The code for PLT entries looks like this:
509
510 The GOT holds the address in the PLT to be executed.
511 The loader then gets:
512 24(15) = Pointer to the structure describing the object.
513 28(15) = Offset in symbol table
514 The loader must then find the module where the function is
515 and insert the address in the GOT.
516
517 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
518 LG 1,0(1) # 6 bytes Load address from GOT in r1
519 BCR 15,1 # 2 bytes Jump to address
520 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
521 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1
522 BRCL 15,-x # 6 bytes Jump to start of PLT
523 .long ? # 4 bytes offset into symbol table
524
525 Total = 32 bytes per PLT entry
526 Fixup at offset 2: relative address to GOT entry
527 Fixup at offset 22: relative branch to PLT0
528 Fixup at offset 28: 32 bit offset into symbol table
529
530 A 32 bit offset into the symbol table is enough. It allows for symbol
531 tables up to a size of 2 gigabyte. A single dynamic object (the main
532 program, any shared library) is limited to 4GB in size and I want to see
533 the program that manages to have a symbol table of more than 2 GB with a
534 total size of at max 4 GB. */
535
536 #define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000
537 #define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310
538 #define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004
539 #define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10
540 #define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c
541 #define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4
542 #define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000
543 #define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000
544
545 /* The first PLT entry pushes the offset into the symbol table
546 from R1 onto the stack at 8(15) and the loader object info
547 at 12(15), loads the loader address in R1 and jumps to it. */
548
549 /* The first entry in the PLT:
550
551 PLT0:
552 STG 1,56(15) # r1 contains the offset into the symbol table
553 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
554 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
555 LG 1,16(1) # get entry address of loader
556 BCR 15,1 # jump to loader
557
558 Fixup at offset 8: relative address to start of GOT. */
559
560 #define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038
561 #define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010
562 #define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000
563 #define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030
564 #define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310
565 #define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004
566 #define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700
567 #define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700
568
569 /* The s390 linker needs to keep track of the number of relocs that it
570 decides to copy as dynamic relocs in check_relocs for each symbol.
571 This is so that it can later discard them if they are found to be
572 unnecessary. We store the information in a field extending the
573 regular ELF linker hash table. */
574
575 struct elf_s390_dyn_relocs
576 {
577 struct elf_s390_dyn_relocs *next;
578
579 /* The input section of the reloc. */
580 asection *sec;
581
582 /* Total number of relocs copied for the input section. */
583 bfd_size_type count;
584
585 /* Number of pc-relative relocs copied for the input section. */
586 bfd_size_type pc_count;
587 };
588
589 /* s390 ELF linker hash entry. */
590
591 struct elf_s390_link_hash_entry
592 {
593 struct elf_link_hash_entry elf;
594
595 /* Track dynamic relocs copied for this symbol. */
596 struct elf_s390_dyn_relocs *dyn_relocs;
597
598 /* Number of GOTPLT references for a function. */
599 bfd_signed_vma gotplt_refcount;
600
601 #define GOT_UNKNOWN 0
602 #define GOT_NORMAL 1
603 #define GOT_TLS_GD 2
604 #define GOT_TLS_IE 3
605 #define GOT_TLS_IE_NLT 3
606 unsigned char tls_type;
607 };
608
609 #define elf_s390_hash_entry(ent) \
610 ((struct elf_s390_link_hash_entry *)(ent))
611
612 struct elf_s390_obj_tdata
613 {
614 struct elf_obj_tdata root;
615
616 /* tls_type for each local got entry. */
617 char *local_got_tls_type;
618 };
619
620 #define elf_s390_tdata(abfd) \
621 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
622
623 #define elf_s390_local_got_tls_type(abfd) \
624 (elf_s390_tdata (abfd)->local_got_tls_type)
625
626 static bfd_boolean
627 elf_s390_mkobject (abfd)
628 bfd *abfd;
629 {
630 bfd_size_type amt = sizeof (struct elf_s390_obj_tdata);
631 abfd->tdata.any = bfd_zalloc (abfd, amt);
632 if (abfd->tdata.any == NULL)
633 return FALSE;
634 return TRUE;
635 }
636
637 static bfd_boolean
638 elf_s390_object_p (abfd)
639 bfd *abfd;
640 {
641 /* Allocate our special target data. */
642 struct elf_s390_obj_tdata *new_tdata;
643 bfd_size_type amt = sizeof (struct elf_s390_obj_tdata);
644 new_tdata = bfd_zalloc (abfd, amt);
645 if (new_tdata == NULL)
646 return FALSE;
647 new_tdata->root = *abfd->tdata.elf_obj_data;
648 abfd->tdata.any = new_tdata;
649 /* Set the right machine number for an s390 elf32 file. */
650 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
651 }
652
653 /* s390 ELF linker hash table. */
654
655 struct elf_s390_link_hash_table
656 {
657 struct elf_link_hash_table elf;
658
659 /* Short-cuts to get to dynamic linker sections. */
660 asection *sgot;
661 asection *sgotplt;
662 asection *srelgot;
663 asection *splt;
664 asection *srelplt;
665 asection *sdynbss;
666 asection *srelbss;
667
668 union {
669 bfd_signed_vma refcount;
670 bfd_vma offset;
671 } tls_ldm_got;
672
673 /* Small local sym to section mapping cache. */
674 struct sym_sec_cache sym_sec;
675 };
676
677 /* Get the s390 ELF linker hash table from a link_info structure. */
678
679 #define elf_s390_hash_table(p) \
680 ((struct elf_s390_link_hash_table *) ((p)->hash))
681
682 /* Create an entry in an s390 ELF linker hash table. */
683
684 static struct bfd_hash_entry *
685 link_hash_newfunc (entry, table, string)
686 struct bfd_hash_entry *entry;
687 struct bfd_hash_table *table;
688 const char *string;
689 {
690 /* Allocate the structure if it has not already been allocated by a
691 subclass. */
692 if (entry == NULL)
693 {
694 entry = bfd_hash_allocate (table,
695 sizeof (struct elf_s390_link_hash_entry));
696 if (entry == NULL)
697 return entry;
698 }
699
700 /* Call the allocation method of the superclass. */
701 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
702 if (entry != NULL)
703 {
704 struct elf_s390_link_hash_entry *eh;
705
706 eh = (struct elf_s390_link_hash_entry *) entry;
707 eh->dyn_relocs = NULL;
708 eh->gotplt_refcount = 0;
709 eh->tls_type = GOT_UNKNOWN;
710 }
711
712 return entry;
713 }
714
715 /* Create an s390 ELF linker hash table. */
716
717 static struct bfd_link_hash_table *
718 elf_s390_link_hash_table_create (abfd)
719 bfd *abfd;
720 {
721 struct elf_s390_link_hash_table *ret;
722 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
723
724 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
725 if (ret == NULL)
726 return NULL;
727
728 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
729 {
730 free (ret);
731 return NULL;
732 }
733
734 ret->sgot = NULL;
735 ret->sgotplt = NULL;
736 ret->srelgot = NULL;
737 ret->splt = NULL;
738 ret->srelplt = NULL;
739 ret->sdynbss = NULL;
740 ret->srelbss = NULL;
741 ret->tls_ldm_got.refcount = 0;
742 ret->sym_sec.abfd = NULL;
743
744 return &ret->elf.root;
745 }
746
747 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
748 shortcuts to them in our hash table. */
749
750 static bfd_boolean
751 create_got_section (dynobj, info)
752 bfd *dynobj;
753 struct bfd_link_info *info;
754 {
755 struct elf_s390_link_hash_table *htab;
756
757 if (! _bfd_elf_create_got_section (dynobj, info))
758 return FALSE;
759
760 htab = elf_s390_hash_table (info);
761 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
762 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
763 if (!htab->sgot || !htab->sgotplt)
764 abort ();
765
766 htab->srelgot = bfd_make_section (dynobj, ".rela.got");
767 if (htab->srelgot == NULL
768 || ! bfd_set_section_flags (dynobj, htab->srelgot,
769 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
770 | SEC_IN_MEMORY | SEC_LINKER_CREATED
771 | SEC_READONLY))
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->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
864 /* If called to transfer flags for a weakdef during processing
865 of elf_adjust_dynamic_symbol, don't copy ELF_LINK_NON_GOT_REF.
866 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
867 dir->elf_link_hash_flags |=
868 (ind->elf_link_hash_flags & (ELF_LINK_HASH_REF_DYNAMIC
869 | ELF_LINK_HASH_REF_REGULAR
870 | ELF_LINK_HASH_REF_REGULAR_NONWEAK));
871 else
872 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
873 }
874
875 static int
876 elf_s390_tls_transition (info, r_type, is_local)
877 struct bfd_link_info *info;
878 int r_type;
879 int is_local;
880 {
881 if (info->shared)
882 return r_type;
883
884 switch (r_type)
885 {
886 case R_390_TLS_GD64:
887 case R_390_TLS_IE64:
888 if (is_local)
889 return R_390_TLS_LE64;
890 return R_390_TLS_IE64;
891 case R_390_TLS_GOTIE64:
892 if (is_local)
893 return R_390_TLS_LE64;
894 return R_390_TLS_GOTIE64;
895 case R_390_TLS_LDM64:
896 return R_390_TLS_LE64;
897 }
898
899 return r_type;
900 }
901
902 /* Look through the relocs for a section during the first phase, and
903 allocate space in the global offset table or procedure linkage
904 table. */
905
906 static bfd_boolean
907 elf_s390_check_relocs (abfd, info, sec, relocs)
908 bfd *abfd;
909 struct bfd_link_info *info;
910 asection *sec;
911 const Elf_Internal_Rela *relocs;
912 {
913 struct elf_s390_link_hash_table *htab;
914 Elf_Internal_Shdr *symtab_hdr;
915 struct elf_link_hash_entry **sym_hashes;
916 const Elf_Internal_Rela *rel;
917 const Elf_Internal_Rela *rel_end;
918 asection *sreloc;
919 bfd_signed_vma *local_got_refcounts;
920 int tls_type, old_tls_type;
921
922 if (info->relocatable)
923 return TRUE;
924
925 htab = elf_s390_hash_table (info);
926 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
927 sym_hashes = elf_sym_hashes (abfd);
928 local_got_refcounts = elf_local_got_refcounts (abfd);
929
930 sreloc = NULL;
931
932 rel_end = relocs + sec->reloc_count;
933 for (rel = relocs; rel < rel_end; rel++)
934 {
935 unsigned int r_type;
936 unsigned long r_symndx;
937 struct elf_link_hash_entry *h;
938
939 r_symndx = ELF64_R_SYM (rel->r_info);
940
941 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
942 {
943 (*_bfd_error_handler) (_("%s: bad symbol index: %d"),
944 bfd_archive_filename (abfd),
945 r_symndx);
946 return FALSE;
947 }
948
949 if (r_symndx < symtab_hdr->sh_info)
950 h = NULL;
951 else
952 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
953
954 /* Create got section and local_got_refcounts array if they
955 are needed. */
956 r_type = elf_s390_tls_transition (info,
957 ELF64_R_TYPE (rel->r_info),
958 h == NULL);
959 switch (r_type)
960 {
961 case R_390_GOT12:
962 case R_390_GOT16:
963 case R_390_GOT20:
964 case R_390_GOT32:
965 case R_390_GOT64:
966 case R_390_GOTENT:
967 case R_390_GOTPLT12:
968 case R_390_GOTPLT16:
969 case R_390_GOTPLT20:
970 case R_390_GOTPLT32:
971 case R_390_GOTPLT64:
972 case R_390_GOTPLTENT:
973 case R_390_TLS_GD64:
974 case R_390_TLS_GOTIE12:
975 case R_390_TLS_GOTIE20:
976 case R_390_TLS_GOTIE64:
977 case R_390_TLS_IEENT:
978 case R_390_TLS_IE64:
979 case R_390_TLS_LDM64:
980 if (h == NULL
981 && local_got_refcounts == NULL)
982 {
983 bfd_size_type size;
984
985 size = symtab_hdr->sh_info;
986 size *= (sizeof (bfd_signed_vma) + sizeof(char));
987 local_got_refcounts = ((bfd_signed_vma *)
988 bfd_zalloc (abfd, size));
989 if (local_got_refcounts == NULL)
990 return FALSE;
991 elf_local_got_refcounts (abfd) = local_got_refcounts;
992 elf_s390_local_got_tls_type (abfd)
993 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
994 }
995 /* Fall through. */
996 case R_390_GOTOFF16:
997 case R_390_GOTOFF32:
998 case R_390_GOTOFF64:
999 case R_390_GOTPC:
1000 case R_390_GOTPCDBL:
1001 if (htab->sgot == NULL)
1002 {
1003 if (htab->elf.dynobj == NULL)
1004 htab->elf.dynobj = abfd;
1005 if (!create_got_section (htab->elf.dynobj, info))
1006 return FALSE;
1007 }
1008 }
1009
1010 switch (r_type)
1011 {
1012 case R_390_GOTOFF16:
1013 case R_390_GOTOFF32:
1014 case R_390_GOTOFF64:
1015 case R_390_GOTPC:
1016 case R_390_GOTPCDBL:
1017 /* Got is created, nothing to be done. */
1018 break;
1019
1020 case R_390_PLT16DBL:
1021 case R_390_PLT32:
1022 case R_390_PLT32DBL:
1023 case R_390_PLT64:
1024 case R_390_PLTOFF16:
1025 case R_390_PLTOFF32:
1026 case R_390_PLTOFF64:
1027 /* This symbol requires a procedure linkage table entry. We
1028 actually build the entry in adjust_dynamic_symbol,
1029 because this might be a case of linking PIC code which is
1030 never referenced by a dynamic object, in which case we
1031 don't need to generate a procedure linkage table entry
1032 after all. */
1033
1034 /* If this is a local symbol, we resolve it directly without
1035 creating a procedure linkage table entry. */
1036 if (h != NULL)
1037 {
1038 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
1039 h->plt.refcount += 1;
1040 }
1041 break;
1042
1043 case R_390_GOTPLT12:
1044 case R_390_GOTPLT16:
1045 case R_390_GOTPLT20:
1046 case R_390_GOTPLT32:
1047 case R_390_GOTPLT64:
1048 case R_390_GOTPLTENT:
1049 /* This symbol requires either a procedure linkage table entry
1050 or an entry in the local got. We actually build the entry
1051 in adjust_dynamic_symbol because whether this is really a
1052 global reference can change and with it the fact if we have
1053 to create a plt entry or a local got entry. To be able to
1054 make a once global symbol a local one we have to keep track
1055 of the number of gotplt references that exist for this
1056 symbol. */
1057 if (h != NULL)
1058 {
1059 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1060 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
1061 h->plt.refcount += 1;
1062 }
1063 else
1064 local_got_refcounts[r_symndx] += 1;
1065 break;
1066
1067 case R_390_TLS_LDM64:
1068 htab->tls_ldm_got.refcount += 1;
1069 break;
1070
1071 case R_390_TLS_IE64:
1072 case R_390_TLS_GOTIE12:
1073 case R_390_TLS_GOTIE20:
1074 case R_390_TLS_GOTIE64:
1075 case R_390_TLS_IEENT:
1076 if (info->shared)
1077 info->flags |= DF_STATIC_TLS;
1078 /* Fall through */
1079
1080 case R_390_GOT12:
1081 case R_390_GOT16:
1082 case R_390_GOT20:
1083 case R_390_GOT32:
1084 case R_390_GOT64:
1085 case R_390_GOTENT:
1086 case R_390_TLS_GD64:
1087 /* This symbol requires a global offset table entry. */
1088 switch (r_type)
1089 {
1090 default:
1091 case R_390_GOT12:
1092 case R_390_GOT16:
1093 case R_390_GOT20:
1094 case R_390_GOT32:
1095 case R_390_GOTENT:
1096 tls_type = GOT_NORMAL;
1097 break;
1098 case R_390_TLS_GD64:
1099 tls_type = GOT_TLS_GD;
1100 break;
1101 case R_390_TLS_IE64:
1102 case R_390_TLS_GOTIE64:
1103 tls_type = GOT_TLS_IE;
1104 break;
1105 case R_390_TLS_GOTIE12:
1106 case R_390_TLS_GOTIE20:
1107 case R_390_TLS_IEENT:
1108 tls_type = GOT_TLS_IE_NLT;
1109 break;
1110 }
1111
1112 if (h != NULL)
1113 {
1114 h->got.refcount += 1;
1115 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1116 }
1117 else
1118 {
1119 local_got_refcounts[r_symndx] += 1;
1120 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1121 }
1122 /* If a TLS symbol is accessed using IE at least once,
1123 there is no point to use dynamic model for it. */
1124 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1125 {
1126 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1127 {
1128 (*_bfd_error_handler)
1129 (_("%s: `%s' accessed both as normal and thread local symbol"),
1130 bfd_archive_filename (abfd), h->root.root.string);
1131 return FALSE;
1132 }
1133 if (old_tls_type > tls_type)
1134 tls_type = old_tls_type;
1135 }
1136
1137 if (old_tls_type != tls_type)
1138 {
1139 if (h != NULL)
1140 elf_s390_hash_entry (h)->tls_type = tls_type;
1141 else
1142 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1143 }
1144
1145 if (r_type != R_390_TLS_IE64)
1146 break;
1147 /* Fall through */
1148
1149 case R_390_TLS_LE64:
1150 if (!info->shared)
1151 break;
1152 info->flags |= DF_STATIC_TLS;
1153 /* Fall through */
1154
1155 case R_390_8:
1156 case R_390_16:
1157 case R_390_32:
1158 case R_390_64:
1159 case R_390_PC16:
1160 case R_390_PC16DBL:
1161 case R_390_PC32:
1162 case R_390_PC32DBL:
1163 case R_390_PC64:
1164 if (h != NULL && !info->shared)
1165 {
1166 /* If this reloc is in a read-only section, we might
1167 need a copy reloc. We can't check reliably at this
1168 stage whether the section is read-only, as input
1169 sections have not yet been mapped to output sections.
1170 Tentatively set the flag for now, and correct in
1171 adjust_dynamic_symbol. */
1172 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
1173
1174 /* We may need a .plt entry if the function this reloc
1175 refers to is in a shared lib. */
1176 h->plt.refcount += 1;
1177 }
1178
1179 /* If we are creating a shared library, and this is a reloc
1180 against a global symbol, or a non PC relative reloc
1181 against a local symbol, then we need to copy the reloc
1182 into the shared library. However, if we are linking with
1183 -Bsymbolic, we do not need to copy a reloc against a
1184 global symbol which is defined in an object we are
1185 including in the link (i.e., DEF_REGULAR is set). At
1186 this point we have not seen all the input files, so it is
1187 possible that DEF_REGULAR is not set now but will be set
1188 later (it is never cleared). In case of a weak definition,
1189 DEF_REGULAR may be cleared later by a strong definition in
1190 a shared library. We account for that possibility below by
1191 storing information in the relocs_copied field of the hash
1192 table entry. A similar situation occurs when creating
1193 shared libraries and symbol visibility changes render the
1194 symbol local.
1195
1196 If on the other hand, we are creating an executable, we
1197 may need to keep relocations for symbols satisfied by a
1198 dynamic library if we manage to avoid copy relocs for the
1199 symbol. */
1200 if ((info->shared
1201 && (sec->flags & SEC_ALLOC) != 0
1202 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
1203 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
1204 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
1205 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
1206 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
1207 || (h != NULL
1208 && (! info->symbolic
1209 || h->root.type == bfd_link_hash_defweak
1210 || (h->elf_link_hash_flags
1211 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1212 || (ELIMINATE_COPY_RELOCS
1213 && !info->shared
1214 && (sec->flags & SEC_ALLOC) != 0
1215 && h != NULL
1216 && (h->root.type == bfd_link_hash_defweak
1217 || (h->elf_link_hash_flags
1218 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1219 {
1220 struct elf_s390_dyn_relocs *p;
1221 struct elf_s390_dyn_relocs **head;
1222
1223 /* We must copy these reloc types into the output file.
1224 Create a reloc section in dynobj and make room for
1225 this reloc. */
1226 if (sreloc == NULL)
1227 {
1228 const char *name;
1229 bfd *dynobj;
1230
1231 name = (bfd_elf_string_from_elf_section
1232 (abfd,
1233 elf_elfheader (abfd)->e_shstrndx,
1234 elf_section_data (sec)->rel_hdr.sh_name));
1235 if (name == NULL)
1236 return FALSE;
1237
1238 if (strncmp (name, ".rela", 5) != 0
1239 || strcmp (bfd_get_section_name (abfd, sec),
1240 name + 5) != 0)
1241 {
1242 (*_bfd_error_handler)
1243 (_("%s: bad relocation section name `%s\'"),
1244 bfd_archive_filename (abfd), name);
1245 }
1246
1247 if (htab->elf.dynobj == NULL)
1248 htab->elf.dynobj = abfd;
1249
1250 dynobj = htab->elf.dynobj;
1251 sreloc = bfd_get_section_by_name (dynobj, name);
1252 if (sreloc == NULL)
1253 {
1254 flagword flags;
1255
1256 sreloc = bfd_make_section (dynobj, name);
1257 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1258 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1259 if ((sec->flags & SEC_ALLOC) != 0)
1260 flags |= SEC_ALLOC | SEC_LOAD;
1261 if (sreloc == NULL
1262 || ! bfd_set_section_flags (dynobj, sreloc, flags)
1263 || ! bfd_set_section_alignment (dynobj, sreloc, 3))
1264 return FALSE;
1265 }
1266 elf_section_data (sec)->sreloc = sreloc;
1267 }
1268
1269 /* If this is a global symbol, we count the number of
1270 relocations we need for this symbol. */
1271 if (h != NULL)
1272 {
1273 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1274 }
1275 else
1276 {
1277 /* Track dynamic relocs needed for local syms too.
1278 We really need local syms available to do this
1279 easily. Oh well. */
1280
1281 asection *s;
1282 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1283 sec, r_symndx);
1284 if (s == NULL)
1285 return FALSE;
1286
1287 head = ((struct elf_s390_dyn_relocs **)
1288 &elf_section_data (s)->local_dynrel);
1289 }
1290
1291 p = *head;
1292 if (p == NULL || p->sec != sec)
1293 {
1294 bfd_size_type amt = sizeof *p;
1295 p = ((struct elf_s390_dyn_relocs *)
1296 bfd_alloc (htab->elf.dynobj, amt));
1297 if (p == NULL)
1298 return FALSE;
1299 p->next = *head;
1300 *head = p;
1301 p->sec = sec;
1302 p->count = 0;
1303 p->pc_count = 0;
1304 }
1305
1306 p->count += 1;
1307 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
1308 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1309 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
1310 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
1311 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
1312 p->pc_count += 1;
1313 }
1314 break;
1315
1316 /* This relocation describes the C++ object vtable hierarchy.
1317 Reconstruct it for later use during GC. */
1318 case R_390_GNU_VTINHERIT:
1319 if (!_bfd_elf64_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1320 return FALSE;
1321 break;
1322
1323 /* This relocation describes which C++ vtable entries are actually
1324 used. Record for later use during GC. */
1325 case R_390_GNU_VTENTRY:
1326 if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1327 return FALSE;
1328 break;
1329
1330 default:
1331 break;
1332 }
1333 }
1334
1335 return TRUE;
1336 }
1337
1338 /* Return the section that should be marked against GC for a given
1339 relocation. */
1340
1341 static asection *
1342 elf_s390_gc_mark_hook (sec, info, rel, h, sym)
1343 asection *sec;
1344 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1345 Elf_Internal_Rela *rel;
1346 struct elf_link_hash_entry *h;
1347 Elf_Internal_Sym *sym;
1348 {
1349 if (h != NULL)
1350 {
1351 switch (ELF64_R_TYPE (rel->r_info))
1352 {
1353 case R_390_GNU_VTINHERIT:
1354 case R_390_GNU_VTENTRY:
1355 break;
1356
1357 default:
1358 switch (h->root.type)
1359 {
1360 case bfd_link_hash_defined:
1361 case bfd_link_hash_defweak:
1362 return h->root.u.def.section;
1363
1364 case bfd_link_hash_common:
1365 return h->root.u.c.p->section;
1366
1367 default:
1368 break;
1369 }
1370 }
1371 }
1372 else
1373 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1374
1375 return NULL;
1376 }
1377
1378 /* Update the got entry reference counts for the section being removed. */
1379
1380 static bfd_boolean
1381 elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
1382 bfd *abfd;
1383 struct bfd_link_info *info;
1384 asection *sec;
1385 const Elf_Internal_Rela *relocs;
1386 {
1387 Elf_Internal_Shdr *symtab_hdr;
1388 struct elf_link_hash_entry **sym_hashes;
1389 bfd_signed_vma *local_got_refcounts;
1390 const Elf_Internal_Rela *rel, *relend;
1391
1392 elf_section_data (sec)->local_dynrel = NULL;
1393
1394 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1395 sym_hashes = elf_sym_hashes (abfd);
1396 local_got_refcounts = elf_local_got_refcounts (abfd);
1397
1398 relend = relocs + sec->reloc_count;
1399 for (rel = relocs; rel < relend; rel++)
1400 {
1401 unsigned long r_symndx;
1402 unsigned int r_type;
1403 struct elf_link_hash_entry *h = NULL;
1404
1405 r_symndx = ELF64_R_SYM (rel->r_info);
1406 if (r_symndx >= symtab_hdr->sh_info)
1407 {
1408 struct elf_s390_link_hash_entry *eh;
1409 struct elf_s390_dyn_relocs **pp;
1410 struct elf_s390_dyn_relocs *p;
1411
1412 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1413 eh = (struct elf_s390_link_hash_entry *) h;
1414
1415 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1416 if (p->sec == sec)
1417 {
1418 /* Everything must go for SEC. */
1419 *pp = p->next;
1420 break;
1421 }
1422 }
1423
1424 r_type = ELF64_R_TYPE (rel->r_info);
1425 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1426 switch (r_type)
1427 {
1428 case R_390_TLS_LDM64:
1429 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1430 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1431 break;
1432
1433 case R_390_TLS_GD64:
1434 case R_390_TLS_IE64:
1435 case R_390_TLS_GOTIE12:
1436 case R_390_TLS_GOTIE20:
1437 case R_390_TLS_GOTIE64:
1438 case R_390_TLS_IEENT:
1439 case R_390_GOT12:
1440 case R_390_GOT16:
1441 case R_390_GOT20:
1442 case R_390_GOT32:
1443 case R_390_GOT64:
1444 case R_390_GOTOFF16:
1445 case R_390_GOTOFF32:
1446 case R_390_GOTOFF64:
1447 case R_390_GOTPC:
1448 case R_390_GOTPCDBL:
1449 case R_390_GOTENT:
1450 if (h != NULL)
1451 {
1452 if (h->got.refcount > 0)
1453 h->got.refcount -= 1;
1454 }
1455 else if (local_got_refcounts != NULL)
1456 {
1457 if (local_got_refcounts[r_symndx] > 0)
1458 local_got_refcounts[r_symndx] -= 1;
1459 }
1460 break;
1461
1462 case R_390_8:
1463 case R_390_12:
1464 case R_390_16:
1465 case R_390_20:
1466 case R_390_32:
1467 case R_390_64:
1468 case R_390_PC16:
1469 case R_390_PC16DBL:
1470 case R_390_PC32:
1471 case R_390_PC32DBL:
1472 case R_390_PC64:
1473 if (info->shared)
1474 break;
1475 /* Fall through */
1476
1477 case R_390_PLT16DBL:
1478 case R_390_PLT32:
1479 case R_390_PLT32DBL:
1480 case R_390_PLT64:
1481 case R_390_PLTOFF16:
1482 case R_390_PLTOFF32:
1483 case R_390_PLTOFF64:
1484 if (h != NULL)
1485 {
1486 if (h->plt.refcount > 0)
1487 h->plt.refcount -= 1;
1488 }
1489 break;
1490
1491 case R_390_GOTPLT12:
1492 case R_390_GOTPLT16:
1493 case R_390_GOTPLT20:
1494 case R_390_GOTPLT32:
1495 case R_390_GOTPLT64:
1496 case R_390_GOTPLTENT:
1497 if (h != NULL)
1498 {
1499 if (h->plt.refcount > 0)
1500 {
1501 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1502 h->plt.refcount -= 1;
1503 }
1504 }
1505 else if (local_got_refcounts != NULL)
1506 {
1507 if (local_got_refcounts[r_symndx] > 0)
1508 local_got_refcounts[r_symndx] -= 1;
1509 }
1510 break;
1511
1512 default:
1513 break;
1514 }
1515 }
1516
1517 return TRUE;
1518 }
1519
1520 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1521 entry but we found we will not create any. Called when we find we will
1522 not have any PLT for this symbol, by for example
1523 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1524 or elf_s390_size_dynamic_sections if no dynamic sections will be
1525 created (we're only linking static objects). */
1526
1527 static void
1528 elf_s390_adjust_gotplt (h)
1529 struct elf_s390_link_hash_entry *h;
1530 {
1531 if (h->elf.root.type == bfd_link_hash_warning)
1532 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1533
1534 if (h->gotplt_refcount <= 0)
1535 return;
1536
1537 /* We simply add the number of gotplt references to the number
1538 * of got references for this symbol. */
1539 h->elf.got.refcount += h->gotplt_refcount;
1540 h->gotplt_refcount = -1;
1541 }
1542
1543 /* Adjust a symbol defined by a dynamic object and referenced by a
1544 regular object. The current definition is in some section of the
1545 dynamic object, but we're not including those sections. We have to
1546 change the definition to something the rest of the link can
1547 understand. */
1548
1549 static bfd_boolean
1550 elf_s390_adjust_dynamic_symbol (info, h)
1551 struct bfd_link_info *info;
1552 struct elf_link_hash_entry *h;
1553 {
1554 struct elf_s390_link_hash_table *htab;
1555 asection *s;
1556 unsigned int power_of_two;
1557
1558 /* If this is a function, put it in the procedure linkage table. We
1559 will fill in the contents of the procedure linkage table later
1560 (although we could actually do it here). */
1561 if (h->type == STT_FUNC
1562 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
1563 {
1564 if (h->plt.refcount <= 0
1565 || (! info->shared
1566 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
1567 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
1568 && h->root.type != bfd_link_hash_undefweak
1569 && h->root.type != bfd_link_hash_undefined))
1570 {
1571 /* This case can occur if we saw a PLT32 reloc in an input
1572 file, but the symbol was never referred to by a dynamic
1573 object, or if all references were garbage collected. In
1574 such a case, we don't actually need to build a procedure
1575 linkage table, and we can just do a PC32 reloc instead. */
1576 h->plt.offset = (bfd_vma) -1;
1577 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1578 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1579 }
1580
1581 return TRUE;
1582 }
1583 else
1584 /* It's possible that we incorrectly decided a .plt reloc was
1585 needed for an R_390_PC32 reloc to a non-function sym in
1586 check_relocs. We can't decide accurately between function and
1587 non-function syms in check-relocs; Objects loaded later in
1588 the link may change h->type. So fix it now. */
1589 h->plt.offset = (bfd_vma) -1;
1590
1591 /* If this is a weak symbol, and there is a real definition, the
1592 processor independent code will have arranged for us to see the
1593 real definition first, and we can just use the same value. */
1594 if (h->weakdef != NULL)
1595 {
1596 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1597 || h->weakdef->root.type == bfd_link_hash_defweak);
1598 h->root.u.def.section = h->weakdef->root.u.def.section;
1599 h->root.u.def.value = h->weakdef->root.u.def.value;
1600 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1601 h->elf_link_hash_flags
1602 = ((h->elf_link_hash_flags & ~ELF_LINK_NON_GOT_REF)
1603 | (h->weakdef->elf_link_hash_flags & ELF_LINK_NON_GOT_REF));
1604 return TRUE;
1605 }
1606
1607 /* This is a reference to a symbol defined by a dynamic object which
1608 is not a function. */
1609
1610 /* If we are creating a shared library, we must presume that the
1611 only references to the symbol are via the global offset table.
1612 For such cases we need not do anything here; the relocations will
1613 be handled correctly by relocate_section. */
1614 if (info->shared)
1615 return TRUE;
1616
1617 /* If there are no references to this symbol that do not use the
1618 GOT, we don't need to generate a copy reloc. */
1619 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1620 return TRUE;
1621
1622 /* If -z nocopyreloc was given, we won't generate them either. */
1623 if (info->nocopyreloc)
1624 {
1625 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1626 return TRUE;
1627 }
1628
1629 if (ELIMINATE_COPY_RELOCS)
1630 {
1631 struct elf_s390_link_hash_entry * eh;
1632 struct elf_s390_dyn_relocs *p;
1633
1634 eh = (struct elf_s390_link_hash_entry *) h;
1635 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1636 {
1637 s = p->sec->output_section;
1638 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1639 break;
1640 }
1641
1642 /* If we didn't find any dynamic relocs in read-only sections, then
1643 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1644 if (p == NULL)
1645 {
1646 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1647 return TRUE;
1648 }
1649 }
1650
1651 /* We must allocate the symbol in our .dynbss section, which will
1652 become part of the .bss section of the executable. There will be
1653 an entry for this symbol in the .dynsym section. The dynamic
1654 object will contain position independent code, so all references
1655 from the dynamic object to this symbol will go through the global
1656 offset table. The dynamic linker will use the .dynsym entry to
1657 determine the address it must put in the global offset table, so
1658 both the dynamic object and the regular object will refer to the
1659 same memory location for the variable. */
1660
1661 htab = elf_s390_hash_table (info);
1662
1663 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1664 copy the initial value out of the dynamic object and into the
1665 runtime process image. */
1666 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1667 {
1668 htab->srelbss->_raw_size += sizeof (Elf64_External_Rela);
1669 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1670 }
1671
1672 /* We need to figure out the alignment required for this symbol. I
1673 have no idea how ELF linkers handle this. */
1674 power_of_two = bfd_log2 (h->size);
1675 if (power_of_two > 3)
1676 power_of_two = 3;
1677
1678 /* Apply the required alignment. */
1679 s = htab->sdynbss;
1680 s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
1681 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1682 {
1683 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1684 return FALSE;
1685 }
1686
1687 /* Define the symbol as being at this point in the section. */
1688 h->root.u.def.section = s;
1689 h->root.u.def.value = s->_raw_size;
1690
1691 /* Increment the section size to make room for the symbol. */
1692 s->_raw_size += h->size;
1693
1694 return TRUE;
1695 }
1696
1697 /* This is the condition under which elf_s390_finish_dynamic_symbol
1698 will be called from elflink.h. If elflink.h doesn't call our
1699 finish_dynamic_symbol routine, we'll need to do something about
1700 initializing any .plt and .got entries in elf_s390_relocate_section. */
1701 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
1702 ((DYN) \
1703 && ((SHARED) \
1704 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1705 && ((H)->dynindx != -1 \
1706 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1707
1708 /* Allocate space in .plt, .got and associated reloc sections for
1709 dynamic relocs. */
1710
1711 static bfd_boolean
1712 allocate_dynrelocs (h, inf)
1713 struct elf_link_hash_entry *h;
1714 PTR inf;
1715 {
1716 struct bfd_link_info *info;
1717 struct elf_s390_link_hash_table *htab;
1718 struct elf_s390_link_hash_entry *eh;
1719 struct elf_s390_dyn_relocs *p;
1720
1721 if (h->root.type == bfd_link_hash_indirect)
1722 return TRUE;
1723
1724 if (h->root.type == bfd_link_hash_warning)
1725 /* When warning symbols are created, they **replace** the "real"
1726 entry in the hash table, thus we never get to see the real
1727 symbol in a hash traversal. So look at it now. */
1728 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1729
1730 info = (struct bfd_link_info *) inf;
1731 htab = elf_s390_hash_table (info);
1732
1733 if (htab->elf.dynamic_sections_created
1734 && h->plt.refcount > 0
1735 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1736 || h->root.type != bfd_link_hash_undefweak))
1737 {
1738 /* Make sure this symbol is output as a dynamic symbol.
1739 Undefined weak syms won't yet be marked as dynamic. */
1740 if (h->dynindx == -1
1741 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1742 {
1743 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
1744 return FALSE;
1745 }
1746
1747 if (info->shared
1748 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1749 {
1750 asection *s = htab->splt;
1751
1752 /* If this is the first .plt entry, make room for the special
1753 first entry. */
1754 if (s->_raw_size == 0)
1755 s->_raw_size += PLT_FIRST_ENTRY_SIZE;
1756
1757 h->plt.offset = s->_raw_size;
1758
1759 /* If this symbol is not defined in a regular file, and we are
1760 not generating a shared library, then set the symbol to this
1761 location in the .plt. This is required to make function
1762 pointers compare as equal between the normal executable and
1763 the shared library. */
1764 if (! info->shared
1765 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1766 {
1767 h->root.u.def.section = s;
1768 h->root.u.def.value = h->plt.offset;
1769 }
1770
1771 /* Make room for this entry. */
1772 s->_raw_size += PLT_ENTRY_SIZE;
1773
1774 /* We also need to make an entry in the .got.plt section, which
1775 will be placed in the .got section by the linker script. */
1776 htab->sgotplt->_raw_size += GOT_ENTRY_SIZE;
1777
1778 /* We also need to make an entry in the .rela.plt section. */
1779 htab->srelplt->_raw_size += sizeof (Elf64_External_Rela);
1780 }
1781 else
1782 {
1783 h->plt.offset = (bfd_vma) -1;
1784 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1785 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1786 }
1787 }
1788 else
1789 {
1790 h->plt.offset = (bfd_vma) -1;
1791 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1792 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1793 }
1794
1795 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to
1796 the binary, we can optimize a bit. IE64 and GOTIE64 get converted
1797 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT
1798 we can save the dynamic TLS relocation. */
1799 if (h->got.refcount > 0
1800 && !info->shared
1801 && h->dynindx == -1
1802 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1803 {
1804 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1805 /* For the GOTIE access without a literal pool entry the offset has
1806 to be stored somewhere. The immediate value in the instruction
1807 is not bit enough so the value is stored in the got. */
1808 {
1809 h->got.offset = htab->sgot->_raw_size;
1810 htab->sgot->_raw_size += GOT_ENTRY_SIZE;
1811 }
1812 else
1813 h->got.offset = (bfd_vma) -1;
1814 }
1815 else if (h->got.refcount > 0)
1816 {
1817 asection *s;
1818 bfd_boolean dyn;
1819 int tls_type = elf_s390_hash_entry(h)->tls_type;
1820
1821 /* Make sure this symbol is output as a dynamic symbol.
1822 Undefined weak syms won't yet be marked as dynamic. */
1823 if (h->dynindx == -1
1824 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1825 {
1826 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
1827 return FALSE;
1828 }
1829
1830 s = htab->sgot;
1831 h->got.offset = s->_raw_size;
1832 s->_raw_size += GOT_ENTRY_SIZE;
1833 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */
1834 if (tls_type == GOT_TLS_GD)
1835 s->_raw_size += GOT_ENTRY_SIZE;
1836 dyn = htab->elf.dynamic_sections_created;
1837 /* R_390_TLS_IE64 needs one dynamic relocation,
1838 R_390_TLS_GD64 needs one if local symbol and two if global. */
1839 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1840 || tls_type >= GOT_TLS_IE)
1841 htab->srelgot->_raw_size += sizeof (Elf64_External_Rela);
1842 else if (tls_type == GOT_TLS_GD)
1843 htab->srelgot->_raw_size += 2 * sizeof (Elf64_External_Rela);
1844 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1845 || h->root.type != bfd_link_hash_undefweak)
1846 && (info->shared
1847 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1848 htab->srelgot->_raw_size += sizeof (Elf64_External_Rela);
1849 }
1850 else
1851 h->got.offset = (bfd_vma) -1;
1852
1853 eh = (struct elf_s390_link_hash_entry *) h;
1854 if (eh->dyn_relocs == NULL)
1855 return TRUE;
1856
1857 /* In the shared -Bsymbolic case, discard space allocated for
1858 dynamic pc-relative relocs against symbols which turn out to be
1859 defined in regular objects. For the normal shared case, discard
1860 space for pc-relative relocs that have become local due to symbol
1861 visibility changes. */
1862
1863 if (info->shared)
1864 {
1865 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1866 && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
1867 || info->symbolic))
1868 {
1869 struct elf_s390_dyn_relocs **pp;
1870
1871 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1872 {
1873 p->count -= p->pc_count;
1874 p->pc_count = 0;
1875 if (p->count == 0)
1876 *pp = p->next;
1877 else
1878 pp = &p->next;
1879 }
1880 }
1881
1882 /* Also discard relocs on undefined weak syms with non-default
1883 visibility. */
1884 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1885 && h->root.type == bfd_link_hash_undefweak)
1886 eh->dyn_relocs = NULL;
1887 }
1888 else if (ELIMINATE_COPY_RELOCS)
1889 {
1890 /* For the non-shared case, discard space for relocs against
1891 symbols which turn out to need copy relocs or are not
1892 dynamic. */
1893
1894 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1895 && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1896 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1897 || (htab->elf.dynamic_sections_created
1898 && (h->root.type == bfd_link_hash_undefweak
1899 || h->root.type == bfd_link_hash_undefined))))
1900 {
1901 /* Make sure this symbol is output as a dynamic symbol.
1902 Undefined weak syms won't yet be marked as dynamic. */
1903 if (h->dynindx == -1
1904 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1905 {
1906 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
1907 return FALSE;
1908 }
1909
1910 /* If that succeeded, we know we'll be keeping all the
1911 relocs. */
1912 if (h->dynindx != -1)
1913 goto keep;
1914 }
1915
1916 eh->dyn_relocs = NULL;
1917
1918 keep: ;
1919 }
1920
1921 /* Finally, allocate space. */
1922 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1923 {
1924 asection *sreloc = elf_section_data (p->sec)->sreloc;
1925 sreloc->_raw_size += p->count * sizeof (Elf64_External_Rela);
1926 }
1927
1928 return TRUE;
1929 }
1930
1931 /* Find any dynamic relocs that apply to read-only sections. */
1932
1933 static bfd_boolean
1934 readonly_dynrelocs (h, inf)
1935 struct elf_link_hash_entry *h;
1936 PTR inf;
1937 {
1938 struct elf_s390_link_hash_entry *eh;
1939 struct elf_s390_dyn_relocs *p;
1940
1941 if (h->root.type == bfd_link_hash_warning)
1942 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1943
1944 eh = (struct elf_s390_link_hash_entry *) h;
1945 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1946 {
1947 asection *s = p->sec->output_section;
1948
1949 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1950 {
1951 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1952
1953 info->flags |= DF_TEXTREL;
1954
1955 /* Not an error, just cut short the traversal. */
1956 return FALSE;
1957 }
1958 }
1959 return TRUE;
1960 }
1961
1962 /* Set the sizes of the dynamic sections. */
1963
1964 static bfd_boolean
1965 elf_s390_size_dynamic_sections (output_bfd, info)
1966 bfd *output_bfd ATTRIBUTE_UNUSED;
1967 struct bfd_link_info *info;
1968 {
1969 struct elf_s390_link_hash_table *htab;
1970 bfd *dynobj;
1971 asection *s;
1972 bfd_boolean relocs;
1973 bfd *ibfd;
1974
1975 htab = elf_s390_hash_table (info);
1976 dynobj = htab->elf.dynobj;
1977 if (dynobj == NULL)
1978 abort ();
1979
1980 if (htab->elf.dynamic_sections_created)
1981 {
1982 /* Set the contents of the .interp section to the interpreter. */
1983 if (info->executable)
1984 {
1985 s = bfd_get_section_by_name (dynobj, ".interp");
1986 if (s == NULL)
1987 abort ();
1988 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1989 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1990 }
1991 }
1992
1993 /* Set up .got offsets for local syms, and space for local dynamic
1994 relocs. */
1995 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1996 {
1997 bfd_signed_vma *local_got;
1998 bfd_signed_vma *end_local_got;
1999 char *local_tls_type;
2000 bfd_size_type locsymcount;
2001 Elf_Internal_Shdr *symtab_hdr;
2002 asection *srela;
2003
2004 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
2005 continue;
2006
2007 for (s = ibfd->sections; s != NULL; s = s->next)
2008 {
2009 struct elf_s390_dyn_relocs *p;
2010
2011 for (p = *((struct elf_s390_dyn_relocs **)
2012 &elf_section_data (s)->local_dynrel);
2013 p != NULL;
2014 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->_raw_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->_raw_size;
2049 s->_raw_size += GOT_ENTRY_SIZE;
2050 if (*local_tls_type == GOT_TLS_GD)
2051 s->_raw_size += GOT_ENTRY_SIZE;
2052 if (info->shared)
2053 srela->_raw_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->_raw_size;
2065 htab->sgot->_raw_size += 2 * GOT_ENTRY_SIZE;
2066 htab->srelgot->_raw_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 {
2087 /* Strip this section if we don't need it; see the
2088 comment below. */
2089 }
2090 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
2091 {
2092 if (s->_raw_size != 0 && s != htab->srelplt)
2093 relocs = TRUE;
2094
2095 /* We use the reloc_count field as a counter if we need
2096 to copy relocs into the output file. */
2097 s->reloc_count = 0;
2098 }
2099 else
2100 {
2101 /* It's not one of our sections, so don't allocate space. */
2102 continue;
2103 }
2104
2105 if (s->_raw_size == 0)
2106 {
2107 /* If we don't need this section, strip it from the
2108 output file. This is to handle .rela.bss and
2109 .rela.plt. We must create it in
2110 create_dynamic_sections, because it must be created
2111 before the linker maps input sections to output
2112 sections. The linker does that before
2113 adjust_dynamic_symbol is called, and it is that
2114 function which decides whether anything needs to go
2115 into these sections. */
2116
2117 _bfd_strip_section_from_output (info, s);
2118 continue;
2119 }
2120
2121 /* Allocate memory for the section contents. We use bfd_zalloc
2122 here in case unused entries are not reclaimed before the
2123 section's contents are written out. This should not happen,
2124 but this way if it does, we get a R_390_NONE reloc instead
2125 of garbage. */
2126 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
2127 if (s->contents == NULL)
2128 return FALSE;
2129 }
2130
2131 if (htab->elf.dynamic_sections_created)
2132 {
2133 /* Add some entries to the .dynamic section. We fill in the
2134 values later, in elf_s390_finish_dynamic_sections, but we
2135 must add the entries now so that we get the correct size for
2136 the .dynamic section. The DT_DEBUG entry is filled in by the
2137 dynamic linker and used by the debugger. */
2138 #define add_dynamic_entry(TAG, VAL) \
2139 bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
2140
2141 if (info->executable)
2142 {
2143 if (!add_dynamic_entry (DT_DEBUG, 0))
2144 return FALSE;
2145 }
2146
2147 if (htab->splt->_raw_size != 0)
2148 {
2149 if (!add_dynamic_entry (DT_PLTGOT, 0)
2150 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2151 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2152 || !add_dynamic_entry (DT_JMPREL, 0))
2153 return FALSE;
2154 }
2155
2156 if (relocs)
2157 {
2158 if (!add_dynamic_entry (DT_RELA, 0)
2159 || !add_dynamic_entry (DT_RELASZ, 0)
2160 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2161 return FALSE;
2162
2163 /* If any dynamic relocs apply to a read-only section,
2164 then we need a DT_TEXTREL entry. */
2165 if ((info->flags & DF_TEXTREL) == 0)
2166 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2167 (PTR) info);
2168
2169 if ((info->flags & DF_TEXTREL) != 0)
2170 {
2171 if (!add_dynamic_entry (DT_TEXTREL, 0))
2172 return FALSE;
2173 }
2174 }
2175 }
2176 #undef add_dynamic_entry
2177
2178 return TRUE;
2179 }
2180
2181 /* Return the base VMA address which should be subtracted from real addresses
2182 when resolving @dtpoff relocation.
2183 This is PT_TLS segment p_vaddr. */
2184
2185 static bfd_vma
2186 dtpoff_base (info)
2187 struct bfd_link_info *info;
2188 {
2189 /* If tls_segment is NULL, we should have signalled an error already. */
2190 if (elf_hash_table (info)->tls_segment == NULL)
2191 return 0;
2192 return elf_hash_table (info)->tls_segment->start;
2193 }
2194
2195 /* Return the relocation value for @tpoff relocation
2196 if STT_TLS virtual address is ADDRESS. */
2197
2198 static bfd_vma
2199 tpoff (info, address)
2200 struct bfd_link_info *info;
2201 bfd_vma address;
2202 {
2203 struct elf_link_tls_segment *tls_segment
2204 = elf_hash_table (info)->tls_segment;
2205
2206 /* If tls_segment is NULL, we should have signalled an error already. */
2207 if (tls_segment == NULL)
2208 return 0;
2209 return (align_power (tls_segment->size, tls_segment->align)
2210 + tls_segment->start - address);
2211 }
2212
2213 /* Complain if TLS instruction relocation is against an invalid
2214 instruction. */
2215
2216 static void
2217 invalid_tls_insn (input_bfd, input_section, rel)
2218 bfd *input_bfd;
2219 asection *input_section;
2220 Elf_Internal_Rela *rel;
2221 {
2222 reloc_howto_type *howto;
2223
2224 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
2225 (*_bfd_error_handler)
2226 (_("%s(%s+0x%lx): invalid instruction for TLS relocation %s"),
2227 bfd_archive_filename (input_bfd),
2228 bfd_get_section_name (input_bfd, input_section),
2229 (long) rel->r_offset,
2230 howto->name);
2231 }
2232
2233 /* Relocate a 390 ELF section. */
2234
2235 static bfd_boolean
2236 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2237 contents, relocs, local_syms, local_sections)
2238 bfd *output_bfd;
2239 struct bfd_link_info *info;
2240 bfd *input_bfd;
2241 asection *input_section;
2242 bfd_byte *contents;
2243 Elf_Internal_Rela *relocs;
2244 Elf_Internal_Sym *local_syms;
2245 asection **local_sections;
2246 {
2247 struct elf_s390_link_hash_table *htab;
2248 Elf_Internal_Shdr *symtab_hdr;
2249 struct elf_link_hash_entry **sym_hashes;
2250 bfd_vma *local_got_offsets;
2251 Elf_Internal_Rela *rel;
2252 Elf_Internal_Rela *relend;
2253
2254 if (info->relocatable)
2255 return TRUE;
2256
2257 htab = elf_s390_hash_table (info);
2258 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2259 sym_hashes = elf_sym_hashes (input_bfd);
2260 local_got_offsets = elf_local_got_offsets (input_bfd);
2261
2262 rel = relocs;
2263 relend = relocs + input_section->reloc_count;
2264 for (; rel < relend; rel++)
2265 {
2266 unsigned int r_type;
2267 reloc_howto_type *howto;
2268 unsigned long r_symndx;
2269 struct elf_link_hash_entry *h;
2270 Elf_Internal_Sym *sym;
2271 asection *sec;
2272 bfd_vma off;
2273 bfd_vma relocation;
2274 bfd_boolean unresolved_reloc;
2275 bfd_reloc_status_type r;
2276 int tls_type;
2277
2278 r_type = ELF64_R_TYPE (rel->r_info);
2279 if (r_type == (int) R_390_GNU_VTINHERIT
2280 || r_type == (int) R_390_GNU_VTENTRY)
2281 continue;
2282 if (r_type >= (int) R_390_max)
2283 {
2284 bfd_set_error (bfd_error_bad_value);
2285 return FALSE;
2286 }
2287
2288 howto = elf_howto_table + r_type;
2289 r_symndx = ELF64_R_SYM (rel->r_info);
2290
2291 /* This is a final link. */
2292 h = NULL;
2293 sym = NULL;
2294 sec = NULL;
2295 unresolved_reloc = FALSE;
2296 if (r_symndx < symtab_hdr->sh_info)
2297 {
2298 sym = local_syms + r_symndx;
2299 sec = local_sections[r_symndx];
2300 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
2301 }
2302 else
2303 {
2304 bfd_boolean warned ATTRIBUTE_UNUSED;
2305
2306 RELOC_FOR_GLOBAL_SYMBOL (h, sym_hashes, r_symndx,
2307 symtab_hdr, relocation, sec,
2308 unresolved_reloc, info,
2309 warned);
2310 }
2311
2312 switch (r_type)
2313 {
2314 case R_390_GOTPLT12:
2315 case R_390_GOTPLT16:
2316 case R_390_GOTPLT20:
2317 case R_390_GOTPLT32:
2318 case R_390_GOTPLT64:
2319 case R_390_GOTPLTENT:
2320 /* There are three cases for a GOTPLT relocation. 1) The
2321 relocation is against the jump slot entry of a plt that
2322 will get emitted to the output file. 2) The relocation
2323 is against the jump slot of a plt entry that has been
2324 removed. elf_s390_adjust_gotplt has created a GOT entry
2325 as replacement. 3) The relocation is against a local symbol.
2326 Cases 2) and 3) are the same as the GOT relocation code
2327 so we just have to test for case 1 and fall through for
2328 the other two. */
2329 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2330 {
2331 bfd_vma plt_index;
2332
2333 /* Calc. index no.
2334 Current offset - size first entry / entry size. */
2335 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2336 PLT_ENTRY_SIZE;
2337
2338 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2339 addr & GOT addr. */
2340 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2341 unresolved_reloc = FALSE;
2342
2343 if (r_type == R_390_GOTPLTENT)
2344 relocation += htab->sgot->output_section->vma;
2345 break;
2346 }
2347 /* Fall through. */
2348
2349 case R_390_GOT12:
2350 case R_390_GOT16:
2351 case R_390_GOT20:
2352 case R_390_GOT32:
2353 case R_390_GOT64:
2354 case R_390_GOTENT:
2355 /* Relocation is to the entry for this symbol in the global
2356 offset table. */
2357 if (htab->sgot == NULL)
2358 abort ();
2359
2360 if (h != NULL)
2361 {
2362 bfd_boolean dyn;
2363
2364 off = h->got.offset;
2365 dyn = htab->elf.dynamic_sections_created;
2366 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2367 || (info->shared
2368 && (info->symbolic
2369 || h->dynindx == -1
2370 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
2371 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
2372 || (ELF_ST_VISIBILITY (h->other)
2373 && h->root.type == bfd_link_hash_undefweak))
2374 {
2375 /* This is actually a static link, or it is a
2376 -Bsymbolic link and the symbol is defined
2377 locally, or the symbol was forced to be local
2378 because of a version file. We must initialize
2379 this entry in the global offset table. Since the
2380 offset must always be a multiple of 2, we use the
2381 least significant bit to record whether we have
2382 initialized it already.
2383
2384 When doing a dynamic link, we create a .rel.got
2385 relocation entry to initialize the value. This
2386 is done in the finish_dynamic_symbol routine. */
2387 if ((off & 1) != 0)
2388 off &= ~1;
2389 else
2390 {
2391 bfd_put_64 (output_bfd, relocation,
2392 htab->sgot->contents + off);
2393 h->got.offset |= 1;
2394 }
2395 }
2396 else
2397 unresolved_reloc = FALSE;
2398 }
2399 else
2400 {
2401 if (local_got_offsets == NULL)
2402 abort ();
2403
2404 off = local_got_offsets[r_symndx];
2405
2406 /* The offset must always be a multiple of 8. We use
2407 the least significant bit to record whether we have
2408 already generated the necessary reloc. */
2409 if ((off & 1) != 0)
2410 off &= ~1;
2411 else
2412 {
2413 bfd_put_64 (output_bfd, relocation,
2414 htab->sgot->contents + off);
2415
2416 if (info->shared)
2417 {
2418 asection *s;
2419 Elf_Internal_Rela outrel;
2420 bfd_byte *loc;
2421
2422 s = htab->srelgot;
2423 if (s == NULL)
2424 abort ();
2425
2426 outrel.r_offset = (htab->sgot->output_section->vma
2427 + htab->sgot->output_offset
2428 + off);
2429 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2430 outrel.r_addend = relocation;
2431 loc = s->contents;
2432 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2433 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2434 }
2435
2436 local_got_offsets[r_symndx] |= 1;
2437 }
2438 }
2439
2440 if (off >= (bfd_vma) -2)
2441 abort ();
2442
2443 relocation = htab->sgot->output_offset + off;
2444
2445 /* For @GOTENT the relocation is against the offset between
2446 the instruction and the symbols entry in the GOT and not
2447 between the start of the GOT and the symbols entry. We
2448 add the vma of the GOT to get the correct value. */
2449 if ( r_type == R_390_GOTENT
2450 || r_type == R_390_GOTPLTENT)
2451 relocation += htab->sgot->output_section->vma;
2452
2453 break;
2454
2455 case R_390_GOTOFF16:
2456 case R_390_GOTOFF32:
2457 case R_390_GOTOFF64:
2458 /* Relocation is relative to the start of the global offset
2459 table. */
2460
2461 /* Note that sgot->output_offset is not involved in this
2462 calculation. We always want the start of .got. If we
2463 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2464 permitted by the ABI, we might have to change this
2465 calculation. */
2466 relocation -= htab->sgot->output_section->vma;
2467 break;
2468
2469 case R_390_GOTPC:
2470 case R_390_GOTPCDBL:
2471 /* Use global offset table as symbol value. */
2472 relocation = htab->sgot->output_section->vma;
2473 unresolved_reloc = FALSE;
2474 break;
2475
2476 case R_390_PLT16DBL:
2477 case R_390_PLT32:
2478 case R_390_PLT32DBL:
2479 case R_390_PLT64:
2480 /* Relocation is to the entry for this symbol in the
2481 procedure linkage table. */
2482
2483 /* Resolve a PLT32 reloc against a local symbol directly,
2484 without using the procedure linkage table. */
2485 if (h == NULL)
2486 break;
2487
2488 if (h->plt.offset == (bfd_vma) -1
2489 || htab->splt == NULL)
2490 {
2491 /* We didn't make a PLT entry for this symbol. This
2492 happens when statically linking PIC code, or when
2493 using -Bsymbolic. */
2494 break;
2495 }
2496
2497 relocation = (htab->splt->output_section->vma
2498 + htab->splt->output_offset
2499 + h->plt.offset);
2500 unresolved_reloc = FALSE;
2501 break;
2502
2503 case R_390_PLTOFF16:
2504 case R_390_PLTOFF32:
2505 case R_390_PLTOFF64:
2506 /* Relocation is to the entry for this symbol in the
2507 procedure linkage table relative to the start of the GOT. */
2508
2509 /* For local symbols or if we didn't make a PLT entry for
2510 this symbol resolve the symbol directly. */
2511 if ( h == NULL
2512 || h->plt.offset == (bfd_vma) -1
2513 || htab->splt == NULL)
2514 {
2515 relocation -= htab->sgot->output_section->vma;
2516 break;
2517 }
2518
2519 relocation = (htab->splt->output_section->vma
2520 + htab->splt->output_offset
2521 + h->plt.offset
2522 - htab->sgot->output_section->vma);
2523 unresolved_reloc = FALSE;
2524 break;
2525
2526 case R_390_8:
2527 case R_390_16:
2528 case R_390_32:
2529 case R_390_64:
2530 case R_390_PC16:
2531 case R_390_PC16DBL:
2532 case R_390_PC32:
2533 case R_390_PC32DBL:
2534 case R_390_PC64:
2535 /* r_symndx will be zero only for relocs against symbols
2536 from removed linkonce sections, or sections discarded by
2537 a linker script. */
2538 if (r_symndx == 0
2539 || (input_section->flags & SEC_ALLOC) == 0)
2540 break;
2541
2542 if ((info->shared
2543 && (h == NULL
2544 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2545 || h->root.type != bfd_link_hash_undefweak)
2546 && ((r_type != R_390_PC16
2547 && r_type != R_390_PC16DBL
2548 && r_type != R_390_PC32
2549 && r_type != R_390_PC32DBL
2550 && r_type != R_390_PC64)
2551 || (h != NULL
2552 && h->dynindx != -1
2553 && (! info->symbolic
2554 || (h->elf_link_hash_flags
2555 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
2556 || (ELIMINATE_COPY_RELOCS
2557 && !info->shared
2558 && h != NULL
2559 && h->dynindx != -1
2560 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
2561 && (((h->elf_link_hash_flags
2562 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2563 && (h->elf_link_hash_flags
2564 & ELF_LINK_HASH_DEF_REGULAR) == 0)
2565 || h->root.type == bfd_link_hash_undefweak
2566 || h->root.type == bfd_link_hash_undefined)))
2567 {
2568 Elf_Internal_Rela outrel;
2569 bfd_boolean skip, relocate;
2570 asection *sreloc;
2571 bfd_byte *loc;
2572
2573 /* When generating a shared object, these relocations
2574 are copied into the output file to be resolved at run
2575 time. */
2576 skip = FALSE;
2577 relocate = FALSE;
2578
2579 outrel.r_offset =
2580 _bfd_elf_section_offset (output_bfd, info, input_section,
2581 rel->r_offset);
2582 if (outrel.r_offset == (bfd_vma) -1)
2583 skip = TRUE;
2584 else if (outrel.r_offset == (bfd_vma) -2)
2585 skip = TRUE, relocate = TRUE;
2586
2587 outrel.r_offset += (input_section->output_section->vma
2588 + input_section->output_offset);
2589
2590 if (skip)
2591 memset (&outrel, 0, sizeof outrel);
2592 else if (h != NULL
2593 && h->dynindx != -1
2594 && (r_type == R_390_PC16
2595 || r_type == R_390_PC16DBL
2596 || r_type == R_390_PC32
2597 || r_type == R_390_PC32DBL
2598 || r_type == R_390_PC64
2599 || !info->shared
2600 || !info->symbolic
2601 || (h->elf_link_hash_flags
2602 & ELF_LINK_HASH_DEF_REGULAR) == 0))
2603 {
2604 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2605 outrel.r_addend = rel->r_addend;
2606 }
2607 else
2608 {
2609 /* This symbol is local, or marked to become local. */
2610 relocate = TRUE;
2611 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2612 outrel.r_addend = relocation + rel->r_addend;
2613 }
2614
2615 sreloc = elf_section_data (input_section)->sreloc;
2616 if (sreloc == NULL)
2617 abort ();
2618
2619 loc = sreloc->contents;
2620 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2621 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2622
2623 /* If this reloc is against an external symbol, we do
2624 not want to fiddle with the addend. Otherwise, we
2625 need to include the symbol value so that it becomes
2626 an addend for the dynamic reloc. */
2627 if (! relocate)
2628 continue;
2629 }
2630
2631 break;
2632
2633 /* Relocations for tls literal pool entries. */
2634 case R_390_TLS_IE64:
2635 if (info->shared)
2636 {
2637 Elf_Internal_Rela outrel;
2638 asection *sreloc;
2639 bfd_byte *loc;
2640
2641 outrel.r_offset = rel->r_offset
2642 + input_section->output_section->vma
2643 + input_section->output_offset;
2644 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2645 sreloc = elf_section_data (input_section)->sreloc;
2646 if (sreloc == NULL)
2647 abort ();
2648 loc = sreloc->contents;
2649 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2650 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2651 }
2652 /* Fall through. */
2653
2654 case R_390_TLS_GD64:
2655 case R_390_TLS_GOTIE64:
2656 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2657 tls_type = GOT_UNKNOWN;
2658 if (h == NULL && local_got_offsets)
2659 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2660 else if (h != NULL)
2661 {
2662 tls_type = elf_s390_hash_entry(h)->tls_type;
2663 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2664 r_type = R_390_TLS_LE64;
2665 }
2666 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2667 r_type = R_390_TLS_IE64;
2668
2669 if (r_type == R_390_TLS_LE64)
2670 {
2671 /* This relocation gets optimized away by the local exec
2672 access optimization. */
2673 BFD_ASSERT (! unresolved_reloc);
2674 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2675 contents + rel->r_offset);
2676 continue;
2677 }
2678
2679 if (htab->sgot == NULL)
2680 abort ();
2681
2682 if (h != NULL)
2683 off = h->got.offset;
2684 else
2685 {
2686 if (local_got_offsets == NULL)
2687 abort ();
2688
2689 off = local_got_offsets[r_symndx];
2690 }
2691
2692 emit_tls_relocs:
2693
2694 if ((off & 1) != 0)
2695 off &= ~1;
2696 else
2697 {
2698 Elf_Internal_Rela outrel;
2699 bfd_byte *loc;
2700 int dr_type, indx;
2701
2702 if (htab->srelgot == NULL)
2703 abort ();
2704
2705 outrel.r_offset = (htab->sgot->output_section->vma
2706 + htab->sgot->output_offset + off);
2707
2708 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2709 if (r_type == R_390_TLS_GD64)
2710 dr_type = R_390_TLS_DTPMOD;
2711 else
2712 dr_type = R_390_TLS_TPOFF;
2713 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2714 outrel.r_addend = relocation - dtpoff_base (info);
2715 else
2716 outrel.r_addend = 0;
2717 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2718 loc = htab->srelgot->contents;
2719 loc += htab->srelgot->reloc_count++
2720 * sizeof (Elf64_External_Rela);
2721 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2722
2723 if (r_type == R_390_TLS_GD64)
2724 {
2725 if (indx == 0)
2726 {
2727 BFD_ASSERT (! unresolved_reloc);
2728 bfd_put_64 (output_bfd,
2729 relocation - dtpoff_base (info),
2730 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2731 }
2732 else
2733 {
2734 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
2735 outrel.r_offset += GOT_ENTRY_SIZE;
2736 outrel.r_addend = 0;
2737 htab->srelgot->reloc_count++;
2738 loc += sizeof (Elf64_External_Rela);
2739 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2740 }
2741 }
2742
2743 if (h != NULL)
2744 h->got.offset |= 1;
2745 else
2746 local_got_offsets[r_symndx] |= 1;
2747 }
2748
2749 if (off >= (bfd_vma) -2)
2750 abort ();
2751 if (r_type == ELF64_R_TYPE (rel->r_info))
2752 {
2753 relocation = htab->sgot->output_offset + off;
2754 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
2755 relocation += htab->sgot->output_section->vma;
2756 unresolved_reloc = FALSE;
2757 }
2758 else
2759 {
2760 bfd_put_64 (output_bfd, htab->sgot->output_offset + off,
2761 contents + rel->r_offset);
2762 continue;
2763 }
2764 break;
2765
2766 case R_390_TLS_GOTIE12:
2767 case R_390_TLS_GOTIE20:
2768 case R_390_TLS_IEENT:
2769 if (h == NULL)
2770 {
2771 if (local_got_offsets == NULL)
2772 abort();
2773 off = local_got_offsets[r_symndx];
2774 if (info->shared)
2775 goto emit_tls_relocs;
2776 }
2777 else
2778 {
2779 off = h->got.offset;
2780 tls_type = elf_s390_hash_entry(h)->tls_type;
2781 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2782 goto emit_tls_relocs;
2783 }
2784
2785 if (htab->sgot == NULL)
2786 abort ();
2787
2788 BFD_ASSERT (! unresolved_reloc);
2789 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2790 htab->sgot->contents + off);
2791 relocation = htab->sgot->output_offset + off;
2792 if (r_type == R_390_TLS_IEENT)
2793 relocation += htab->sgot->output_section->vma;
2794 unresolved_reloc = FALSE;
2795 break;
2796
2797 case R_390_TLS_LDM64:
2798 if (! info->shared)
2799 /* The literal pool entry this relocation refers to gets ignored
2800 by the optimized code of the local exec model. Do nothing
2801 and the value will turn out zero. */
2802 continue;
2803
2804 if (htab->sgot == NULL)
2805 abort ();
2806
2807 off = htab->tls_ldm_got.offset;
2808 if (off & 1)
2809 off &= ~1;
2810 else
2811 {
2812 Elf_Internal_Rela outrel;
2813 bfd_byte *loc;
2814
2815 if (htab->srelgot == NULL)
2816 abort ();
2817
2818 outrel.r_offset = (htab->sgot->output_section->vma
2819 + htab->sgot->output_offset + off);
2820
2821 bfd_put_64 (output_bfd, 0,
2822 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2823 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
2824 outrel.r_addend = 0;
2825 loc = htab->srelgot->contents;
2826 loc += htab->srelgot->reloc_count++
2827 * sizeof (Elf64_External_Rela);
2828 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2829 htab->tls_ldm_got.offset |= 1;
2830 }
2831 relocation = htab->sgot->output_offset + off;
2832 unresolved_reloc = FALSE;
2833 break;
2834
2835 case R_390_TLS_LE64:
2836 if (info->shared)
2837 {
2838 /* Linking a shared library with non-fpic code requires
2839 a R_390_TLS_TPOFF relocation. */
2840 Elf_Internal_Rela outrel;
2841 asection *sreloc;
2842 bfd_byte *loc;
2843 int indx;
2844
2845 outrel.r_offset = rel->r_offset
2846 + input_section->output_section->vma
2847 + input_section->output_offset;
2848 if (h != NULL && h->dynindx != -1)
2849 indx = h->dynindx;
2850 else
2851 indx = 0;
2852 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
2853 if (indx == 0)
2854 outrel.r_addend = relocation - dtpoff_base (info);
2855 else
2856 outrel.r_addend = 0;
2857 sreloc = elf_section_data (input_section)->sreloc;
2858 if (sreloc == NULL)
2859 abort ();
2860 loc = sreloc->contents;
2861 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2862 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2863 }
2864 else
2865 {
2866 BFD_ASSERT (! unresolved_reloc);
2867 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2868 contents + rel->r_offset);
2869 }
2870 continue;
2871
2872 case R_390_TLS_LDO64:
2873 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2874 relocation -= dtpoff_base (info);
2875 else
2876 /* When converting LDO to LE, we must negate. */
2877 relocation = -tpoff (info, relocation);
2878 break;
2879
2880 /* Relocations for tls instructions. */
2881 case R_390_TLS_LOAD:
2882 case R_390_TLS_GDCALL:
2883 case R_390_TLS_LDCALL:
2884 tls_type = GOT_UNKNOWN;
2885 if (h == NULL && local_got_offsets)
2886 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2887 else if (h != NULL)
2888 tls_type = elf_s390_hash_entry(h)->tls_type;
2889
2890 if (tls_type == GOT_TLS_GD)
2891 continue;
2892
2893 if (r_type == R_390_TLS_LOAD)
2894 {
2895 if (!info->shared && (h == NULL || h->dynindx == -1))
2896 {
2897 /* IE->LE transition. Four valid cases:
2898 lg %rx,(0,%ry) -> sllg %rx,%ry,0
2899 lg %rx,(%ry,0) -> sllg %rx,%ry,0
2900 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
2901 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
2902 unsigned int insn0, insn1, ry;
2903
2904 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2905 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2906 if (insn1 != 0x0004)
2907 invalid_tls_insn (input_bfd, input_section, rel);
2908 ry = 0;
2909 if ((insn0 & 0xff00f000) == 0xe3000000)
2910 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
2911 ry = (insn0 & 0x000f0000);
2912 else if ((insn0 & 0xff0f0000) == 0xe3000000)
2913 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
2914 ry = (insn0 & 0x0000f000) << 4;
2915 else if ((insn0 & 0xff00f000) == 0xe300c000)
2916 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
2917 ry = (insn0 & 0x000f0000);
2918 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
2919 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
2920 ry = (insn0 & 0x0000f000) << 4;
2921 else
2922 invalid_tls_insn (input_bfd, input_section, rel);
2923 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
2924 insn1 = 0x000d;
2925 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2926 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2927 }
2928 }
2929 else if (r_type == R_390_TLS_GDCALL)
2930 {
2931 unsigned int insn0, insn1;
2932
2933 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2934 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2935 if ((insn0 & 0xffff0000) != 0xc0e50000)
2936 invalid_tls_insn (input_bfd, input_section, rel);
2937 if (!info->shared && (h == NULL || h->dynindx == -1))
2938 {
2939 /* GD->LE transition.
2940 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2941 insn0 = 0xc0040000;
2942 insn1 = 0x0000;
2943 }
2944 else
2945 {
2946 /* GD->IE transition.
2947 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
2948 insn0 = 0xe322c000;
2949 insn1 = 0x0004;
2950 }
2951 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2952 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2953 }
2954 else if (r_type == R_390_TLS_LDCALL)
2955 {
2956 if (!info->shared)
2957 {
2958 unsigned int insn0, insn1;
2959
2960 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2961 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2962 if ((insn0 & 0xffff0000) != 0xc0e50000)
2963 invalid_tls_insn (input_bfd, input_section, rel);
2964 /* LD->LE transition.
2965 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2966 insn0 = 0xc0040000;
2967 insn1 = 0x0000;
2968 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2969 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2970 }
2971 }
2972 continue;
2973
2974 default:
2975 break;
2976 }
2977
2978 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2979 because such sections are not SEC_ALLOC and thus ld.so will
2980 not process them. */
2981 if (unresolved_reloc
2982 && !((input_section->flags & SEC_DEBUGGING) != 0
2983 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
2984 (*_bfd_error_handler)
2985 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
2986 bfd_archive_filename (input_bfd),
2987 bfd_get_section_name (input_bfd, input_section),
2988 (long) rel->r_offset,
2989 h->root.root.string);
2990
2991 if (r_type == R_390_20
2992 || r_type == R_390_GOT20
2993 || r_type == R_390_GOTPLT20
2994 || r_type == R_390_TLS_GOTIE20)
2995 {
2996 relocation += rel->r_addend;
2997 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
2998 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
2999 contents, rel->r_offset,
3000 relocation, 0);
3001 }
3002 else
3003 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3004 contents, rel->r_offset,
3005 relocation, rel->r_addend);
3006
3007 if (r != bfd_reloc_ok)
3008 {
3009 const char *name;
3010
3011 if (h != NULL)
3012 name = h->root.root.string;
3013 else
3014 {
3015 name = bfd_elf_string_from_elf_section (input_bfd,
3016 symtab_hdr->sh_link,
3017 sym->st_name);
3018 if (name == NULL)
3019 return FALSE;
3020 if (*name == '\0')
3021 name = bfd_section_name (input_bfd, sec);
3022 }
3023
3024 if (r == bfd_reloc_overflow)
3025 {
3026
3027 if (! ((*info->callbacks->reloc_overflow)
3028 (info, name, howto->name, (bfd_vma) 0,
3029 input_bfd, input_section, rel->r_offset)))
3030 return FALSE;
3031 }
3032 else
3033 {
3034 (*_bfd_error_handler)
3035 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
3036 bfd_archive_filename (input_bfd),
3037 bfd_get_section_name (input_bfd, input_section),
3038 (long) rel->r_offset, name, (int) r);
3039 return FALSE;
3040 }
3041 }
3042 }
3043
3044 return TRUE;
3045 }
3046
3047 /* Finish up dynamic symbol handling. We set the contents of various
3048 dynamic sections here. */
3049
3050 static bfd_boolean
3051 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3052 bfd *output_bfd;
3053 struct bfd_link_info *info;
3054 struct elf_link_hash_entry *h;
3055 Elf_Internal_Sym *sym;
3056 {
3057 struct elf_s390_link_hash_table *htab;
3058
3059 htab = elf_s390_hash_table (info);
3060
3061 if (h->plt.offset != (bfd_vma) -1)
3062 {
3063 bfd_vma plt_index;
3064 bfd_vma got_offset;
3065 Elf_Internal_Rela rela;
3066 bfd_byte *loc;
3067
3068 /* This symbol has an entry in the procedure linkage table. Set
3069 it up. */
3070
3071 if (h->dynindx == -1
3072 || htab->splt == NULL
3073 || htab->sgotplt == NULL
3074 || htab->srelplt == NULL)
3075 abort ();
3076
3077 /* Calc. index no.
3078 Current offset - size first entry / entry size. */
3079 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3080
3081 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
3082 addr & GOT addr. */
3083 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3084
3085 /* Fill in the blueprint of a PLT. */
3086 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3087 htab->splt->contents + h->plt.offset);
3088 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3089 htab->splt->contents + h->plt.offset + 4);
3090 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3091 htab->splt->contents + h->plt.offset + 8);
3092 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3093 htab->splt->contents + h->plt.offset + 12);
3094 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3095 htab->splt->contents + h->plt.offset + 16);
3096 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5,
3097 htab->splt->contents + h->plt.offset + 20);
3098 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6,
3099 htab->splt->contents + h->plt.offset + 24);
3100 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7,
3101 htab->splt->contents + h->plt.offset + 28);
3102 /* Fixup the relative address to the GOT entry */
3103 bfd_put_32 (output_bfd,
3104 (htab->sgotplt->output_section->vma +
3105 htab->sgotplt->output_offset + got_offset
3106 - (htab->splt->output_section->vma + h->plt.offset))/2,
3107 htab->splt->contents + h->plt.offset + 2);
3108 /* Fixup the relative branch to PLT 0 */
3109 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3110 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3111 htab->splt->contents + h->plt.offset + 24);
3112 /* Fixup offset into symbol table */
3113 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3114 htab->splt->contents + h->plt.offset + 28);
3115
3116 /* Fill in the entry in the global offset table.
3117 Points to instruction after GOT offset. */
3118 bfd_put_64 (output_bfd,
3119 (htab->splt->output_section->vma
3120 + htab->splt->output_offset
3121 + h->plt.offset
3122 + 14),
3123 htab->sgotplt->contents + got_offset);
3124
3125 /* Fill in the entry in the .rela.plt section. */
3126 rela.r_offset = (htab->sgotplt->output_section->vma
3127 + htab->sgotplt->output_offset
3128 + got_offset);
3129 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3130 rela.r_addend = 0;
3131 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela);
3132 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3133
3134 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
3135 {
3136 /* Mark the symbol as undefined, rather than as defined in
3137 the .plt section. Leave the value alone. This is a clue
3138 for the dynamic linker, to make function pointer
3139 comparisons work between an application and shared
3140 library. */
3141 sym->st_shndx = SHN_UNDEF;
3142 }
3143 }
3144
3145 if (h->got.offset != (bfd_vma) -1
3146 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3147 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3148 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3149 {
3150 Elf_Internal_Rela rela;
3151 bfd_byte *loc;
3152
3153 /* This symbol has an entry in the global offset table. Set it
3154 up. */
3155 if (htab->sgot == NULL || htab->srelgot == NULL)
3156 abort ();
3157
3158 rela.r_offset = (htab->sgot->output_section->vma
3159 + htab->sgot->output_offset
3160 + (h->got.offset &~ (bfd_vma) 1));
3161
3162 /* If this is a static link, or it is a -Bsymbolic link and the
3163 symbol is defined locally or was forced to be local because
3164 of a version file, we just want to emit a RELATIVE reloc.
3165 The entry in the global offset table will already have been
3166 initialized in the relocate_section function. */
3167 if (info->shared
3168 && (info->symbolic
3169 || h->dynindx == -1
3170 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
3171 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
3172 {
3173 BFD_ASSERT((h->got.offset & 1) != 0);
3174 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3175 rela.r_addend = (h->root.u.def.value
3176 + h->root.u.def.section->output_section->vma
3177 + h->root.u.def.section->output_offset);
3178 }
3179 else
3180 {
3181 BFD_ASSERT((h->got.offset & 1) == 0);
3182 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3183 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3184 rela.r_addend = 0;
3185 }
3186
3187 loc = htab->srelgot->contents;
3188 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3189 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3190 }
3191
3192 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
3193 {
3194 Elf_Internal_Rela rela;
3195 bfd_byte *loc;
3196
3197 /* This symbols needs a copy reloc. Set it up. */
3198
3199 if (h->dynindx == -1
3200 || (h->root.type != bfd_link_hash_defined
3201 && h->root.type != bfd_link_hash_defweak)
3202 || htab->srelbss == NULL)
3203 abort ();
3204
3205 rela.r_offset = (h->root.u.def.value
3206 + h->root.u.def.section->output_section->vma
3207 + h->root.u.def.section->output_offset);
3208 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3209 rela.r_addend = 0;
3210 loc = htab->srelbss->contents;
3211 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3212 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3213 }
3214
3215 /* Mark some specially defined symbols as absolute. */
3216 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3217 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
3218 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
3219 sym->st_shndx = SHN_ABS;
3220
3221 return TRUE;
3222 }
3223
3224 /* Used to decide how to sort relocs in an optimal manner for the
3225 dynamic linker, before writing them out. */
3226
3227 static enum elf_reloc_type_class
3228 elf_s390_reloc_type_class (rela)
3229 const Elf_Internal_Rela *rela;
3230 {
3231 switch ((int) ELF64_R_TYPE (rela->r_info))
3232 {
3233 case R_390_RELATIVE:
3234 return reloc_class_relative;
3235 case R_390_JMP_SLOT:
3236 return reloc_class_plt;
3237 case R_390_COPY:
3238 return reloc_class_copy;
3239 default:
3240 return reloc_class_normal;
3241 }
3242 }
3243
3244 /* Finish up the dynamic sections. */
3245
3246 static bfd_boolean
3247 elf_s390_finish_dynamic_sections (output_bfd, info)
3248 bfd *output_bfd;
3249 struct bfd_link_info *info;
3250 {
3251 struct elf_s390_link_hash_table *htab;
3252 bfd *dynobj;
3253 asection *sdyn;
3254
3255 htab = elf_s390_hash_table (info);
3256 dynobj = htab->elf.dynobj;
3257 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3258
3259 if (htab->elf.dynamic_sections_created)
3260 {
3261 Elf64_External_Dyn *dyncon, *dynconend;
3262
3263 if (sdyn == NULL || htab->sgot == NULL)
3264 abort ();
3265
3266 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3267 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
3268 for (; dyncon < dynconend; dyncon++)
3269 {
3270 Elf_Internal_Dyn dyn;
3271 asection *s;
3272
3273 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3274
3275 switch (dyn.d_tag)
3276 {
3277 default:
3278 continue;
3279
3280 case DT_PLTGOT:
3281 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3282 break;
3283
3284 case DT_JMPREL:
3285 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3286 break;
3287
3288 case DT_PLTRELSZ:
3289 s = htab->srelplt->output_section;
3290 if (s->_cooked_size != 0)
3291 dyn.d_un.d_val = s->_cooked_size;
3292 else
3293 dyn.d_un.d_val = s->_raw_size;
3294 break;
3295
3296 case DT_RELASZ:
3297 /* The procedure linkage table relocs (DT_JMPREL) should
3298 not be included in the overall relocs (DT_RELA).
3299 Therefore, we override the DT_RELASZ entry here to
3300 make it not include the JMPREL relocs. Since the
3301 linker script arranges for .rela.plt to follow all
3302 other relocation sections, we don't have to worry
3303 about changing the DT_RELA entry. */
3304 s = htab->srelplt->output_section;
3305 if (s->_cooked_size != 0)
3306 dyn.d_un.d_val -= s->_cooked_size;
3307 else
3308 dyn.d_un.d_val -= s->_raw_size;
3309 break;
3310 }
3311
3312 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3313 }
3314
3315 /* Fill in the special first entry in the procedure linkage table. */
3316 if (htab->splt && htab->splt->_raw_size > 0)
3317 {
3318 /* fill in blueprint for plt 0 entry */
3319 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0,
3320 htab->splt->contents );
3321 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3322 htab->splt->contents +4 );
3323 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3324 htab->splt->contents +12 );
3325 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3326 htab->splt->contents +16 );
3327 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3328 htab->splt->contents +20 );
3329 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6,
3330 htab->splt->contents + 24);
3331 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7,
3332 htab->splt->contents + 28 );
3333 /* Fixup relative address to start of GOT */
3334 bfd_put_32 (output_bfd,
3335 (htab->sgotplt->output_section->vma +
3336 htab->sgotplt->output_offset
3337 - htab->splt->output_section->vma - 6)/2,
3338 htab->splt->contents + 8);
3339 }
3340 elf_section_data (htab->splt->output_section)
3341 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE;
3342 }
3343
3344 if (htab->sgotplt)
3345 {
3346 /* Fill in the first three entries in the global offset table. */
3347 if (htab->sgotplt->_raw_size > 0)
3348 {
3349 bfd_put_64 (output_bfd,
3350 (sdyn == NULL ? (bfd_vma) 0
3351 : sdyn->output_section->vma + sdyn->output_offset),
3352 htab->sgotplt->contents);
3353 /* One entry for shared object struct ptr. */
3354 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3355 /* One entry for _dl_runtime_resolve. */
3356 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12);
3357 }
3358
3359 elf_section_data (htab->sgot->output_section)
3360 ->this_hdr.sh_entsize = 8;
3361 }
3362 return TRUE;
3363 }
3364
3365 /* Why was the hash table entry size definition changed from
3366 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3367 this is the only reason for the s390_elf64_size_info structure. */
3368
3369 const struct elf_size_info s390_elf64_size_info =
3370 {
3371 sizeof (Elf64_External_Ehdr),
3372 sizeof (Elf64_External_Phdr),
3373 sizeof (Elf64_External_Shdr),
3374 sizeof (Elf64_External_Rel),
3375 sizeof (Elf64_External_Rela),
3376 sizeof (Elf64_External_Sym),
3377 sizeof (Elf64_External_Dyn),
3378 sizeof (Elf_External_Note),
3379 8, /* hash-table entry size. */
3380 1, /* internal relocations per external relocations. */
3381 64, /* arch_size. */
3382 3, /* log_file_align. */
3383 ELFCLASS64, EV_CURRENT,
3384 bfd_elf64_write_out_phdrs,
3385 bfd_elf64_write_shdrs_and_ehdr,
3386 bfd_elf64_write_relocs,
3387 bfd_elf64_swap_symbol_in,
3388 bfd_elf64_swap_symbol_out,
3389 bfd_elf64_slurp_reloc_table,
3390 bfd_elf64_slurp_symbol_table,
3391 bfd_elf64_swap_dyn_in,
3392 bfd_elf64_swap_dyn_out,
3393 bfd_elf64_swap_reloc_in,
3394 bfd_elf64_swap_reloc_out,
3395 bfd_elf64_swap_reloca_in,
3396 bfd_elf64_swap_reloca_out
3397 };
3398
3399 #define TARGET_BIG_SYM bfd_elf64_s390_vec
3400 #define TARGET_BIG_NAME "elf64-s390"
3401 #define ELF_ARCH bfd_arch_s390
3402 #define ELF_MACHINE_CODE EM_S390
3403 #define ELF_MACHINE_ALT1 EM_S390_OLD
3404 #define ELF_MAXPAGESIZE 0x1000
3405
3406 #define elf_backend_size_info s390_elf64_size_info
3407
3408 #define elf_backend_can_gc_sections 1
3409 #define elf_backend_can_refcount 1
3410 #define elf_backend_want_got_plt 1
3411 #define elf_backend_plt_readonly 1
3412 #define elf_backend_want_plt_sym 0
3413 #define elf_backend_got_header_size 24
3414 #define elf_backend_plt_header_size PLT_ENTRY_SIZE
3415 #define elf_backend_rela_normal 1
3416
3417 #define elf_info_to_howto elf_s390_info_to_howto
3418
3419 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3420 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3421 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3422
3423 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3424 #define elf_backend_check_relocs elf_s390_check_relocs
3425 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3426 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3427 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3428 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3429 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3430 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3431 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3432 #define elf_backend_relocate_section elf_s390_relocate_section
3433 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3434 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3435
3436 #define bfd_elf64_mkobject elf_s390_mkobject
3437 #define elf_backend_object_p elf_s390_object_p
3438
3439 #include "elf64-target.h"
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