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[deliverable/binutils-gdb.git] / bfd / elf64-s390.c
1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003 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_sec is NULL, we should have signalled an error already. */
2190 if (elf_hash_table (info)->tls_sec == NULL)
2191 return 0;
2192 return elf_hash_table (info)->tls_sec->vma;
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_hash_table *htab = elf_hash_table (info);
2204
2205 /* If tls_sec is NULL, we should have signalled an error already. */
2206 if (htab->tls_sec == NULL)
2207 return 0;
2208 return htab->tls_size + htab->tls_sec->vma - address;
2209 }
2210
2211 /* Complain if TLS instruction relocation is against an invalid
2212 instruction. */
2213
2214 static void
2215 invalid_tls_insn (input_bfd, input_section, rel)
2216 bfd *input_bfd;
2217 asection *input_section;
2218 Elf_Internal_Rela *rel;
2219 {
2220 reloc_howto_type *howto;
2221
2222 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
2223 (*_bfd_error_handler)
2224 (_("%s(%s+0x%lx): invalid instruction for TLS relocation %s"),
2225 bfd_archive_filename (input_bfd),
2226 bfd_get_section_name (input_bfd, input_section),
2227 (long) rel->r_offset,
2228 howto->name);
2229 }
2230
2231 /* Relocate a 390 ELF section. */
2232
2233 static bfd_boolean
2234 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2235 contents, relocs, local_syms, local_sections)
2236 bfd *output_bfd;
2237 struct bfd_link_info *info;
2238 bfd *input_bfd;
2239 asection *input_section;
2240 bfd_byte *contents;
2241 Elf_Internal_Rela *relocs;
2242 Elf_Internal_Sym *local_syms;
2243 asection **local_sections;
2244 {
2245 struct elf_s390_link_hash_table *htab;
2246 Elf_Internal_Shdr *symtab_hdr;
2247 struct elf_link_hash_entry **sym_hashes;
2248 bfd_vma *local_got_offsets;
2249 Elf_Internal_Rela *rel;
2250 Elf_Internal_Rela *relend;
2251
2252 if (info->relocatable)
2253 return TRUE;
2254
2255 htab = elf_s390_hash_table (info);
2256 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2257 sym_hashes = elf_sym_hashes (input_bfd);
2258 local_got_offsets = elf_local_got_offsets (input_bfd);
2259
2260 rel = relocs;
2261 relend = relocs + input_section->reloc_count;
2262 for (; rel < relend; rel++)
2263 {
2264 unsigned int r_type;
2265 reloc_howto_type *howto;
2266 unsigned long r_symndx;
2267 struct elf_link_hash_entry *h;
2268 Elf_Internal_Sym *sym;
2269 asection *sec;
2270 bfd_vma off;
2271 bfd_vma relocation;
2272 bfd_boolean unresolved_reloc;
2273 bfd_reloc_status_type r;
2274 int tls_type;
2275
2276 r_type = ELF64_R_TYPE (rel->r_info);
2277 if (r_type == (int) R_390_GNU_VTINHERIT
2278 || r_type == (int) R_390_GNU_VTENTRY)
2279 continue;
2280 if (r_type >= (int) R_390_max)
2281 {
2282 bfd_set_error (bfd_error_bad_value);
2283 return FALSE;
2284 }
2285
2286 howto = elf_howto_table + r_type;
2287 r_symndx = ELF64_R_SYM (rel->r_info);
2288
2289 /* This is a final link. */
2290 h = NULL;
2291 sym = NULL;
2292 sec = NULL;
2293 unresolved_reloc = FALSE;
2294 if (r_symndx < symtab_hdr->sh_info)
2295 {
2296 sym = local_syms + r_symndx;
2297 sec = local_sections[r_symndx];
2298 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
2299 }
2300 else
2301 {
2302 bfd_boolean warned ATTRIBUTE_UNUSED;
2303
2304 RELOC_FOR_GLOBAL_SYMBOL (h, sym_hashes, r_symndx,
2305 symtab_hdr, relocation, sec,
2306 unresolved_reloc, info,
2307 warned);
2308 }
2309
2310 switch (r_type)
2311 {
2312 case R_390_GOTPLT12:
2313 case R_390_GOTPLT16:
2314 case R_390_GOTPLT20:
2315 case R_390_GOTPLT32:
2316 case R_390_GOTPLT64:
2317 case R_390_GOTPLTENT:
2318 /* There are three cases for a GOTPLT relocation. 1) The
2319 relocation is against the jump slot entry of a plt that
2320 will get emitted to the output file. 2) The relocation
2321 is against the jump slot of a plt entry that has been
2322 removed. elf_s390_adjust_gotplt has created a GOT entry
2323 as replacement. 3) The relocation is against a local symbol.
2324 Cases 2) and 3) are the same as the GOT relocation code
2325 so we just have to test for case 1 and fall through for
2326 the other two. */
2327 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2328 {
2329 bfd_vma plt_index;
2330
2331 /* Calc. index no.
2332 Current offset - size first entry / entry size. */
2333 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2334 PLT_ENTRY_SIZE;
2335
2336 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2337 addr & GOT addr. */
2338 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2339 unresolved_reloc = FALSE;
2340
2341 if (r_type == R_390_GOTPLTENT)
2342 relocation += htab->sgot->output_section->vma;
2343 break;
2344 }
2345 /* Fall through. */
2346
2347 case R_390_GOT12:
2348 case R_390_GOT16:
2349 case R_390_GOT20:
2350 case R_390_GOT32:
2351 case R_390_GOT64:
2352 case R_390_GOTENT:
2353 /* Relocation is to the entry for this symbol in the global
2354 offset table. */
2355 if (htab->sgot == NULL)
2356 abort ();
2357
2358 if (h != NULL)
2359 {
2360 bfd_boolean dyn;
2361
2362 off = h->got.offset;
2363 dyn = htab->elf.dynamic_sections_created;
2364 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2365 || (info->shared
2366 && (info->symbolic
2367 || h->dynindx == -1
2368 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
2369 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
2370 || (ELF_ST_VISIBILITY (h->other)
2371 && h->root.type == bfd_link_hash_undefweak))
2372 {
2373 /* This is actually a static link, or it is a
2374 -Bsymbolic link and the symbol is defined
2375 locally, or the symbol was forced to be local
2376 because of a version file. We must initialize
2377 this entry in the global offset table. Since the
2378 offset must always be a multiple of 2, we use the
2379 least significant bit to record whether we have
2380 initialized it already.
2381
2382 When doing a dynamic link, we create a .rel.got
2383 relocation entry to initialize the value. This
2384 is done in the finish_dynamic_symbol routine. */
2385 if ((off & 1) != 0)
2386 off &= ~1;
2387 else
2388 {
2389 bfd_put_64 (output_bfd, relocation,
2390 htab->sgot->contents + off);
2391 h->got.offset |= 1;
2392 }
2393 }
2394 else
2395 unresolved_reloc = FALSE;
2396 }
2397 else
2398 {
2399 if (local_got_offsets == NULL)
2400 abort ();
2401
2402 off = local_got_offsets[r_symndx];
2403
2404 /* The offset must always be a multiple of 8. We use
2405 the least significant bit to record whether we have
2406 already generated the necessary reloc. */
2407 if ((off & 1) != 0)
2408 off &= ~1;
2409 else
2410 {
2411 bfd_put_64 (output_bfd, relocation,
2412 htab->sgot->contents + off);
2413
2414 if (info->shared)
2415 {
2416 asection *s;
2417 Elf_Internal_Rela outrel;
2418 bfd_byte *loc;
2419
2420 s = htab->srelgot;
2421 if (s == NULL)
2422 abort ();
2423
2424 outrel.r_offset = (htab->sgot->output_section->vma
2425 + htab->sgot->output_offset
2426 + off);
2427 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2428 outrel.r_addend = relocation;
2429 loc = s->contents;
2430 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2431 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2432 }
2433
2434 local_got_offsets[r_symndx] |= 1;
2435 }
2436 }
2437
2438 if (off >= (bfd_vma) -2)
2439 abort ();
2440
2441 relocation = htab->sgot->output_offset + off;
2442
2443 /* For @GOTENT the relocation is against the offset between
2444 the instruction and the symbols entry in the GOT and not
2445 between the start of the GOT and the symbols entry. We
2446 add the vma of the GOT to get the correct value. */
2447 if ( r_type == R_390_GOTENT
2448 || r_type == R_390_GOTPLTENT)
2449 relocation += htab->sgot->output_section->vma;
2450
2451 break;
2452
2453 case R_390_GOTOFF16:
2454 case R_390_GOTOFF32:
2455 case R_390_GOTOFF64:
2456 /* Relocation is relative to the start of the global offset
2457 table. */
2458
2459 /* Note that sgot->output_offset is not involved in this
2460 calculation. We always want the start of .got. If we
2461 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2462 permitted by the ABI, we might have to change this
2463 calculation. */
2464 relocation -= htab->sgot->output_section->vma;
2465 break;
2466
2467 case R_390_GOTPC:
2468 case R_390_GOTPCDBL:
2469 /* Use global offset table as symbol value. */
2470 relocation = htab->sgot->output_section->vma;
2471 unresolved_reloc = FALSE;
2472 break;
2473
2474 case R_390_PLT16DBL:
2475 case R_390_PLT32:
2476 case R_390_PLT32DBL:
2477 case R_390_PLT64:
2478 /* Relocation is to the entry for this symbol in the
2479 procedure linkage table. */
2480
2481 /* Resolve a PLT32 reloc against a local symbol directly,
2482 without using the procedure linkage table. */
2483 if (h == NULL)
2484 break;
2485
2486 if (h->plt.offset == (bfd_vma) -1
2487 || htab->splt == NULL)
2488 {
2489 /* We didn't make a PLT entry for this symbol. This
2490 happens when statically linking PIC code, or when
2491 using -Bsymbolic. */
2492 break;
2493 }
2494
2495 relocation = (htab->splt->output_section->vma
2496 + htab->splt->output_offset
2497 + h->plt.offset);
2498 unresolved_reloc = FALSE;
2499 break;
2500
2501 case R_390_PLTOFF16:
2502 case R_390_PLTOFF32:
2503 case R_390_PLTOFF64:
2504 /* Relocation is to the entry for this symbol in the
2505 procedure linkage table relative to the start of the GOT. */
2506
2507 /* For local symbols or if we didn't make a PLT entry for
2508 this symbol resolve the symbol directly. */
2509 if ( h == NULL
2510 || h->plt.offset == (bfd_vma) -1
2511 || htab->splt == NULL)
2512 {
2513 relocation -= htab->sgot->output_section->vma;
2514 break;
2515 }
2516
2517 relocation = (htab->splt->output_section->vma
2518 + htab->splt->output_offset
2519 + h->plt.offset
2520 - htab->sgot->output_section->vma);
2521 unresolved_reloc = FALSE;
2522 break;
2523
2524 case R_390_8:
2525 case R_390_16:
2526 case R_390_32:
2527 case R_390_64:
2528 case R_390_PC16:
2529 case R_390_PC16DBL:
2530 case R_390_PC32:
2531 case R_390_PC32DBL:
2532 case R_390_PC64:
2533 /* r_symndx will be zero only for relocs against symbols
2534 from removed linkonce sections, or sections discarded by
2535 a linker script. */
2536 if (r_symndx == 0
2537 || (input_section->flags & SEC_ALLOC) == 0)
2538 break;
2539
2540 if ((info->shared
2541 && (h == NULL
2542 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2543 || h->root.type != bfd_link_hash_undefweak)
2544 && ((r_type != R_390_PC16
2545 && r_type != R_390_PC16DBL
2546 && r_type != R_390_PC32
2547 && r_type != R_390_PC32DBL
2548 && r_type != R_390_PC64)
2549 || (h != NULL
2550 && h->dynindx != -1
2551 && (! info->symbolic
2552 || (h->elf_link_hash_flags
2553 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
2554 || (ELIMINATE_COPY_RELOCS
2555 && !info->shared
2556 && h != NULL
2557 && h->dynindx != -1
2558 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
2559 && (((h->elf_link_hash_flags
2560 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2561 && (h->elf_link_hash_flags
2562 & ELF_LINK_HASH_DEF_REGULAR) == 0)
2563 || h->root.type == bfd_link_hash_undefweak
2564 || h->root.type == bfd_link_hash_undefined)))
2565 {
2566 Elf_Internal_Rela outrel;
2567 bfd_boolean skip, relocate;
2568 asection *sreloc;
2569 bfd_byte *loc;
2570
2571 /* When generating a shared object, these relocations
2572 are copied into the output file to be resolved at run
2573 time. */
2574 skip = FALSE;
2575 relocate = FALSE;
2576
2577 outrel.r_offset =
2578 _bfd_elf_section_offset (output_bfd, info, input_section,
2579 rel->r_offset);
2580 if (outrel.r_offset == (bfd_vma) -1)
2581 skip = TRUE;
2582 else if (outrel.r_offset == (bfd_vma) -2)
2583 skip = TRUE, relocate = TRUE;
2584
2585 outrel.r_offset += (input_section->output_section->vma
2586 + input_section->output_offset);
2587
2588 if (skip)
2589 memset (&outrel, 0, sizeof outrel);
2590 else if (h != NULL
2591 && h->dynindx != -1
2592 && (r_type == R_390_PC16
2593 || r_type == R_390_PC16DBL
2594 || r_type == R_390_PC32
2595 || r_type == R_390_PC32DBL
2596 || r_type == R_390_PC64
2597 || !info->shared
2598 || !info->symbolic
2599 || (h->elf_link_hash_flags
2600 & ELF_LINK_HASH_DEF_REGULAR) == 0))
2601 {
2602 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2603 outrel.r_addend = rel->r_addend;
2604 }
2605 else
2606 {
2607 /* This symbol is local, or marked to become local. */
2608 relocate = TRUE;
2609 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2610 outrel.r_addend = relocation + rel->r_addend;
2611 }
2612
2613 sreloc = elf_section_data (input_section)->sreloc;
2614 if (sreloc == NULL)
2615 abort ();
2616
2617 loc = sreloc->contents;
2618 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2619 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2620
2621 /* If this reloc is against an external symbol, we do
2622 not want to fiddle with the addend. Otherwise, we
2623 need to include the symbol value so that it becomes
2624 an addend for the dynamic reloc. */
2625 if (! relocate)
2626 continue;
2627 }
2628
2629 break;
2630
2631 /* Relocations for tls literal pool entries. */
2632 case R_390_TLS_IE64:
2633 if (info->shared)
2634 {
2635 Elf_Internal_Rela outrel;
2636 asection *sreloc;
2637 bfd_byte *loc;
2638
2639 outrel.r_offset = rel->r_offset
2640 + input_section->output_section->vma
2641 + input_section->output_offset;
2642 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2643 sreloc = elf_section_data (input_section)->sreloc;
2644 if (sreloc == NULL)
2645 abort ();
2646 loc = sreloc->contents;
2647 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2648 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2649 }
2650 /* Fall through. */
2651
2652 case R_390_TLS_GD64:
2653 case R_390_TLS_GOTIE64:
2654 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2655 tls_type = GOT_UNKNOWN;
2656 if (h == NULL && local_got_offsets)
2657 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2658 else if (h != NULL)
2659 {
2660 tls_type = elf_s390_hash_entry(h)->tls_type;
2661 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2662 r_type = R_390_TLS_LE64;
2663 }
2664 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2665 r_type = R_390_TLS_IE64;
2666
2667 if (r_type == R_390_TLS_LE64)
2668 {
2669 /* This relocation gets optimized away by the local exec
2670 access optimization. */
2671 BFD_ASSERT (! unresolved_reloc);
2672 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2673 contents + rel->r_offset);
2674 continue;
2675 }
2676
2677 if (htab->sgot == NULL)
2678 abort ();
2679
2680 if (h != NULL)
2681 off = h->got.offset;
2682 else
2683 {
2684 if (local_got_offsets == NULL)
2685 abort ();
2686
2687 off = local_got_offsets[r_symndx];
2688 }
2689
2690 emit_tls_relocs:
2691
2692 if ((off & 1) != 0)
2693 off &= ~1;
2694 else
2695 {
2696 Elf_Internal_Rela outrel;
2697 bfd_byte *loc;
2698 int dr_type, indx;
2699
2700 if (htab->srelgot == NULL)
2701 abort ();
2702
2703 outrel.r_offset = (htab->sgot->output_section->vma
2704 + htab->sgot->output_offset + off);
2705
2706 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2707 if (r_type == R_390_TLS_GD64)
2708 dr_type = R_390_TLS_DTPMOD;
2709 else
2710 dr_type = R_390_TLS_TPOFF;
2711 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2712 outrel.r_addend = relocation - dtpoff_base (info);
2713 else
2714 outrel.r_addend = 0;
2715 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2716 loc = htab->srelgot->contents;
2717 loc += htab->srelgot->reloc_count++
2718 * sizeof (Elf64_External_Rela);
2719 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2720
2721 if (r_type == R_390_TLS_GD64)
2722 {
2723 if (indx == 0)
2724 {
2725 BFD_ASSERT (! unresolved_reloc);
2726 bfd_put_64 (output_bfd,
2727 relocation - dtpoff_base (info),
2728 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2729 }
2730 else
2731 {
2732 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
2733 outrel.r_offset += GOT_ENTRY_SIZE;
2734 outrel.r_addend = 0;
2735 htab->srelgot->reloc_count++;
2736 loc += sizeof (Elf64_External_Rela);
2737 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2738 }
2739 }
2740
2741 if (h != NULL)
2742 h->got.offset |= 1;
2743 else
2744 local_got_offsets[r_symndx] |= 1;
2745 }
2746
2747 if (off >= (bfd_vma) -2)
2748 abort ();
2749 if (r_type == ELF64_R_TYPE (rel->r_info))
2750 {
2751 relocation = htab->sgot->output_offset + off;
2752 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
2753 relocation += htab->sgot->output_section->vma;
2754 unresolved_reloc = FALSE;
2755 }
2756 else
2757 {
2758 bfd_put_64 (output_bfd, htab->sgot->output_offset + off,
2759 contents + rel->r_offset);
2760 continue;
2761 }
2762 break;
2763
2764 case R_390_TLS_GOTIE12:
2765 case R_390_TLS_GOTIE20:
2766 case R_390_TLS_IEENT:
2767 if (h == NULL)
2768 {
2769 if (local_got_offsets == NULL)
2770 abort();
2771 off = local_got_offsets[r_symndx];
2772 if (info->shared)
2773 goto emit_tls_relocs;
2774 }
2775 else
2776 {
2777 off = h->got.offset;
2778 tls_type = elf_s390_hash_entry(h)->tls_type;
2779 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2780 goto emit_tls_relocs;
2781 }
2782
2783 if (htab->sgot == NULL)
2784 abort ();
2785
2786 BFD_ASSERT (! unresolved_reloc);
2787 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2788 htab->sgot->contents + off);
2789 relocation = htab->sgot->output_offset + off;
2790 if (r_type == R_390_TLS_IEENT)
2791 relocation += htab->sgot->output_section->vma;
2792 unresolved_reloc = FALSE;
2793 break;
2794
2795 case R_390_TLS_LDM64:
2796 if (! info->shared)
2797 /* The literal pool entry this relocation refers to gets ignored
2798 by the optimized code of the local exec model. Do nothing
2799 and the value will turn out zero. */
2800 continue;
2801
2802 if (htab->sgot == NULL)
2803 abort ();
2804
2805 off = htab->tls_ldm_got.offset;
2806 if (off & 1)
2807 off &= ~1;
2808 else
2809 {
2810 Elf_Internal_Rela outrel;
2811 bfd_byte *loc;
2812
2813 if (htab->srelgot == NULL)
2814 abort ();
2815
2816 outrel.r_offset = (htab->sgot->output_section->vma
2817 + htab->sgot->output_offset + off);
2818
2819 bfd_put_64 (output_bfd, 0,
2820 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2821 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
2822 outrel.r_addend = 0;
2823 loc = htab->srelgot->contents;
2824 loc += htab->srelgot->reloc_count++
2825 * sizeof (Elf64_External_Rela);
2826 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2827 htab->tls_ldm_got.offset |= 1;
2828 }
2829 relocation = htab->sgot->output_offset + off;
2830 unresolved_reloc = FALSE;
2831 break;
2832
2833 case R_390_TLS_LE64:
2834 if (info->shared)
2835 {
2836 /* Linking a shared library with non-fpic code requires
2837 a R_390_TLS_TPOFF relocation. */
2838 Elf_Internal_Rela outrel;
2839 asection *sreloc;
2840 bfd_byte *loc;
2841 int indx;
2842
2843 outrel.r_offset = rel->r_offset
2844 + input_section->output_section->vma
2845 + input_section->output_offset;
2846 if (h != NULL && h->dynindx != -1)
2847 indx = h->dynindx;
2848 else
2849 indx = 0;
2850 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
2851 if (indx == 0)
2852 outrel.r_addend = relocation - dtpoff_base (info);
2853 else
2854 outrel.r_addend = 0;
2855 sreloc = elf_section_data (input_section)->sreloc;
2856 if (sreloc == NULL)
2857 abort ();
2858 loc = sreloc->contents;
2859 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2860 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2861 }
2862 else
2863 {
2864 BFD_ASSERT (! unresolved_reloc);
2865 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2866 contents + rel->r_offset);
2867 }
2868 continue;
2869
2870 case R_390_TLS_LDO64:
2871 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2872 relocation -= dtpoff_base (info);
2873 else
2874 /* When converting LDO to LE, we must negate. */
2875 relocation = -tpoff (info, relocation);
2876 break;
2877
2878 /* Relocations for tls instructions. */
2879 case R_390_TLS_LOAD:
2880 case R_390_TLS_GDCALL:
2881 case R_390_TLS_LDCALL:
2882 tls_type = GOT_UNKNOWN;
2883 if (h == NULL && local_got_offsets)
2884 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2885 else if (h != NULL)
2886 tls_type = elf_s390_hash_entry(h)->tls_type;
2887
2888 if (tls_type == GOT_TLS_GD)
2889 continue;
2890
2891 if (r_type == R_390_TLS_LOAD)
2892 {
2893 if (!info->shared && (h == NULL || h->dynindx == -1))
2894 {
2895 /* IE->LE transition. Four valid cases:
2896 lg %rx,(0,%ry) -> sllg %rx,%ry,0
2897 lg %rx,(%ry,0) -> sllg %rx,%ry,0
2898 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
2899 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
2900 unsigned int insn0, insn1, ry;
2901
2902 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2903 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2904 if (insn1 != 0x0004)
2905 invalid_tls_insn (input_bfd, input_section, rel);
2906 ry = 0;
2907 if ((insn0 & 0xff00f000) == 0xe3000000)
2908 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
2909 ry = (insn0 & 0x000f0000);
2910 else if ((insn0 & 0xff0f0000) == 0xe3000000)
2911 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
2912 ry = (insn0 & 0x0000f000) << 4;
2913 else if ((insn0 & 0xff00f000) == 0xe300c000)
2914 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
2915 ry = (insn0 & 0x000f0000);
2916 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
2917 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
2918 ry = (insn0 & 0x0000f000) << 4;
2919 else
2920 invalid_tls_insn (input_bfd, input_section, rel);
2921 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
2922 insn1 = 0x000d;
2923 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2924 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2925 }
2926 }
2927 else if (r_type == R_390_TLS_GDCALL)
2928 {
2929 unsigned int insn0, insn1;
2930
2931 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2932 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2933 if ((insn0 & 0xffff0000) != 0xc0e50000)
2934 invalid_tls_insn (input_bfd, input_section, rel);
2935 if (!info->shared && (h == NULL || h->dynindx == -1))
2936 {
2937 /* GD->LE transition.
2938 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2939 insn0 = 0xc0040000;
2940 insn1 = 0x0000;
2941 }
2942 else
2943 {
2944 /* GD->IE transition.
2945 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
2946 insn0 = 0xe322c000;
2947 insn1 = 0x0004;
2948 }
2949 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2950 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2951 }
2952 else if (r_type == R_390_TLS_LDCALL)
2953 {
2954 if (!info->shared)
2955 {
2956 unsigned int insn0, insn1;
2957
2958 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2959 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2960 if ((insn0 & 0xffff0000) != 0xc0e50000)
2961 invalid_tls_insn (input_bfd, input_section, rel);
2962 /* LD->LE transition.
2963 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2964 insn0 = 0xc0040000;
2965 insn1 = 0x0000;
2966 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2967 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2968 }
2969 }
2970 continue;
2971
2972 default:
2973 break;
2974 }
2975
2976 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2977 because such sections are not SEC_ALLOC and thus ld.so will
2978 not process them. */
2979 if (unresolved_reloc
2980 && !((input_section->flags & SEC_DEBUGGING) != 0
2981 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
2982 (*_bfd_error_handler)
2983 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
2984 bfd_archive_filename (input_bfd),
2985 bfd_get_section_name (input_bfd, input_section),
2986 (long) rel->r_offset,
2987 h->root.root.string);
2988
2989 if (r_type == R_390_20
2990 || r_type == R_390_GOT20
2991 || r_type == R_390_GOTPLT20
2992 || r_type == R_390_TLS_GOTIE20)
2993 {
2994 relocation += rel->r_addend;
2995 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
2996 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
2997 contents, rel->r_offset,
2998 relocation, 0);
2999 }
3000 else
3001 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3002 contents, rel->r_offset,
3003 relocation, rel->r_addend);
3004
3005 if (r != bfd_reloc_ok)
3006 {
3007 const char *name;
3008
3009 if (h != NULL)
3010 name = h->root.root.string;
3011 else
3012 {
3013 name = bfd_elf_string_from_elf_section (input_bfd,
3014 symtab_hdr->sh_link,
3015 sym->st_name);
3016 if (name == NULL)
3017 return FALSE;
3018 if (*name == '\0')
3019 name = bfd_section_name (input_bfd, sec);
3020 }
3021
3022 if (r == bfd_reloc_overflow)
3023 {
3024
3025 if (! ((*info->callbacks->reloc_overflow)
3026 (info, name, howto->name, (bfd_vma) 0,
3027 input_bfd, input_section, rel->r_offset)))
3028 return FALSE;
3029 }
3030 else
3031 {
3032 (*_bfd_error_handler)
3033 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
3034 bfd_archive_filename (input_bfd),
3035 bfd_get_section_name (input_bfd, input_section),
3036 (long) rel->r_offset, name, (int) r);
3037 return FALSE;
3038 }
3039 }
3040 }
3041
3042 return TRUE;
3043 }
3044
3045 /* Finish up dynamic symbol handling. We set the contents of various
3046 dynamic sections here. */
3047
3048 static bfd_boolean
3049 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3050 bfd *output_bfd;
3051 struct bfd_link_info *info;
3052 struct elf_link_hash_entry *h;
3053 Elf_Internal_Sym *sym;
3054 {
3055 struct elf_s390_link_hash_table *htab;
3056
3057 htab = elf_s390_hash_table (info);
3058
3059 if (h->plt.offset != (bfd_vma) -1)
3060 {
3061 bfd_vma plt_index;
3062 bfd_vma got_offset;
3063 Elf_Internal_Rela rela;
3064 bfd_byte *loc;
3065
3066 /* This symbol has an entry in the procedure linkage table. Set
3067 it up. */
3068
3069 if (h->dynindx == -1
3070 || htab->splt == NULL
3071 || htab->sgotplt == NULL
3072 || htab->srelplt == NULL)
3073 abort ();
3074
3075 /* Calc. index no.
3076 Current offset - size first entry / entry size. */
3077 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3078
3079 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
3080 addr & GOT addr. */
3081 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3082
3083 /* Fill in the blueprint of a PLT. */
3084 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3085 htab->splt->contents + h->plt.offset);
3086 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3087 htab->splt->contents + h->plt.offset + 4);
3088 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3089 htab->splt->contents + h->plt.offset + 8);
3090 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3091 htab->splt->contents + h->plt.offset + 12);
3092 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3093 htab->splt->contents + h->plt.offset + 16);
3094 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5,
3095 htab->splt->contents + h->plt.offset + 20);
3096 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6,
3097 htab->splt->contents + h->plt.offset + 24);
3098 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7,
3099 htab->splt->contents + h->plt.offset + 28);
3100 /* Fixup the relative address to the GOT entry */
3101 bfd_put_32 (output_bfd,
3102 (htab->sgotplt->output_section->vma +
3103 htab->sgotplt->output_offset + got_offset
3104 - (htab->splt->output_section->vma + h->plt.offset))/2,
3105 htab->splt->contents + h->plt.offset + 2);
3106 /* Fixup the relative branch to PLT 0 */
3107 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3108 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3109 htab->splt->contents + h->plt.offset + 24);
3110 /* Fixup offset into symbol table */
3111 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3112 htab->splt->contents + h->plt.offset + 28);
3113
3114 /* Fill in the entry in the global offset table.
3115 Points to instruction after GOT offset. */
3116 bfd_put_64 (output_bfd,
3117 (htab->splt->output_section->vma
3118 + htab->splt->output_offset
3119 + h->plt.offset
3120 + 14),
3121 htab->sgotplt->contents + got_offset);
3122
3123 /* Fill in the entry in the .rela.plt section. */
3124 rela.r_offset = (htab->sgotplt->output_section->vma
3125 + htab->sgotplt->output_offset
3126 + got_offset);
3127 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3128 rela.r_addend = 0;
3129 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela);
3130 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3131
3132 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
3133 {
3134 /* Mark the symbol as undefined, rather than as defined in
3135 the .plt section. Leave the value alone. This is a clue
3136 for the dynamic linker, to make function pointer
3137 comparisons work between an application and shared
3138 library. */
3139 sym->st_shndx = SHN_UNDEF;
3140 }
3141 }
3142
3143 if (h->got.offset != (bfd_vma) -1
3144 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3145 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3146 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3147 {
3148 Elf_Internal_Rela rela;
3149 bfd_byte *loc;
3150
3151 /* This symbol has an entry in the global offset table. Set it
3152 up. */
3153 if (htab->sgot == NULL || htab->srelgot == NULL)
3154 abort ();
3155
3156 rela.r_offset = (htab->sgot->output_section->vma
3157 + htab->sgot->output_offset
3158 + (h->got.offset &~ (bfd_vma) 1));
3159
3160 /* If this is a static link, or it is a -Bsymbolic link and the
3161 symbol is defined locally or was forced to be local because
3162 of a version file, we just want to emit a RELATIVE reloc.
3163 The entry in the global offset table will already have been
3164 initialized in the relocate_section function. */
3165 if (info->shared
3166 && (info->symbolic
3167 || h->dynindx == -1
3168 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
3169 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
3170 {
3171 BFD_ASSERT((h->got.offset & 1) != 0);
3172 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3173 rela.r_addend = (h->root.u.def.value
3174 + h->root.u.def.section->output_section->vma
3175 + h->root.u.def.section->output_offset);
3176 }
3177 else
3178 {
3179 BFD_ASSERT((h->got.offset & 1) == 0);
3180 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3181 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3182 rela.r_addend = 0;
3183 }
3184
3185 loc = htab->srelgot->contents;
3186 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3187 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3188 }
3189
3190 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
3191 {
3192 Elf_Internal_Rela rela;
3193 bfd_byte *loc;
3194
3195 /* This symbols needs a copy reloc. Set it up. */
3196
3197 if (h->dynindx == -1
3198 || (h->root.type != bfd_link_hash_defined
3199 && h->root.type != bfd_link_hash_defweak)
3200 || htab->srelbss == NULL)
3201 abort ();
3202
3203 rela.r_offset = (h->root.u.def.value
3204 + h->root.u.def.section->output_section->vma
3205 + h->root.u.def.section->output_offset);
3206 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3207 rela.r_addend = 0;
3208 loc = htab->srelbss->contents;
3209 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3210 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3211 }
3212
3213 /* Mark some specially defined symbols as absolute. */
3214 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3215 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
3216 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
3217 sym->st_shndx = SHN_ABS;
3218
3219 return TRUE;
3220 }
3221
3222 /* Used to decide how to sort relocs in an optimal manner for the
3223 dynamic linker, before writing them out. */
3224
3225 static enum elf_reloc_type_class
3226 elf_s390_reloc_type_class (rela)
3227 const Elf_Internal_Rela *rela;
3228 {
3229 switch ((int) ELF64_R_TYPE (rela->r_info))
3230 {
3231 case R_390_RELATIVE:
3232 return reloc_class_relative;
3233 case R_390_JMP_SLOT:
3234 return reloc_class_plt;
3235 case R_390_COPY:
3236 return reloc_class_copy;
3237 default:
3238 return reloc_class_normal;
3239 }
3240 }
3241
3242 /* Finish up the dynamic sections. */
3243
3244 static bfd_boolean
3245 elf_s390_finish_dynamic_sections (output_bfd, info)
3246 bfd *output_bfd;
3247 struct bfd_link_info *info;
3248 {
3249 struct elf_s390_link_hash_table *htab;
3250 bfd *dynobj;
3251 asection *sdyn;
3252
3253 htab = elf_s390_hash_table (info);
3254 dynobj = htab->elf.dynobj;
3255 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3256
3257 if (htab->elf.dynamic_sections_created)
3258 {
3259 Elf64_External_Dyn *dyncon, *dynconend;
3260
3261 if (sdyn == NULL || htab->sgot == NULL)
3262 abort ();
3263
3264 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3265 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
3266 for (; dyncon < dynconend; dyncon++)
3267 {
3268 Elf_Internal_Dyn dyn;
3269 asection *s;
3270
3271 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3272
3273 switch (dyn.d_tag)
3274 {
3275 default:
3276 continue;
3277
3278 case DT_PLTGOT:
3279 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3280 break;
3281
3282 case DT_JMPREL:
3283 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3284 break;
3285
3286 case DT_PLTRELSZ:
3287 s = htab->srelplt->output_section;
3288 if (s->_cooked_size != 0)
3289 dyn.d_un.d_val = s->_cooked_size;
3290 else
3291 dyn.d_un.d_val = s->_raw_size;
3292 break;
3293
3294 case DT_RELASZ:
3295 /* The procedure linkage table relocs (DT_JMPREL) should
3296 not be included in the overall relocs (DT_RELA).
3297 Therefore, we override the DT_RELASZ entry here to
3298 make it not include the JMPREL relocs. Since the
3299 linker script arranges for .rela.plt to follow all
3300 other relocation sections, we don't have to worry
3301 about changing the DT_RELA entry. */
3302 s = htab->srelplt->output_section;
3303 if (s->_cooked_size != 0)
3304 dyn.d_un.d_val -= s->_cooked_size;
3305 else
3306 dyn.d_un.d_val -= s->_raw_size;
3307 break;
3308 }
3309
3310 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3311 }
3312
3313 /* Fill in the special first entry in the procedure linkage table. */
3314 if (htab->splt && htab->splt->_raw_size > 0)
3315 {
3316 /* fill in blueprint for plt 0 entry */
3317 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0,
3318 htab->splt->contents );
3319 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3320 htab->splt->contents +4 );
3321 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3322 htab->splt->contents +12 );
3323 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3324 htab->splt->contents +16 );
3325 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3326 htab->splt->contents +20 );
3327 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6,
3328 htab->splt->contents + 24);
3329 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7,
3330 htab->splt->contents + 28 );
3331 /* Fixup relative address to start of GOT */
3332 bfd_put_32 (output_bfd,
3333 (htab->sgotplt->output_section->vma +
3334 htab->sgotplt->output_offset
3335 - htab->splt->output_section->vma - 6)/2,
3336 htab->splt->contents + 8);
3337 }
3338 elf_section_data (htab->splt->output_section)
3339 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE;
3340 }
3341
3342 if (htab->sgotplt)
3343 {
3344 /* Fill in the first three entries in the global offset table. */
3345 if (htab->sgotplt->_raw_size > 0)
3346 {
3347 bfd_put_64 (output_bfd,
3348 (sdyn == NULL ? (bfd_vma) 0
3349 : sdyn->output_section->vma + sdyn->output_offset),
3350 htab->sgotplt->contents);
3351 /* One entry for shared object struct ptr. */
3352 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3353 /* One entry for _dl_runtime_resolve. */
3354 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12);
3355 }
3356
3357 elf_section_data (htab->sgot->output_section)
3358 ->this_hdr.sh_entsize = 8;
3359 }
3360 return TRUE;
3361 }
3362
3363 /* Why was the hash table entry size definition changed from
3364 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3365 this is the only reason for the s390_elf64_size_info structure. */
3366
3367 const struct elf_size_info s390_elf64_size_info =
3368 {
3369 sizeof (Elf64_External_Ehdr),
3370 sizeof (Elf64_External_Phdr),
3371 sizeof (Elf64_External_Shdr),
3372 sizeof (Elf64_External_Rel),
3373 sizeof (Elf64_External_Rela),
3374 sizeof (Elf64_External_Sym),
3375 sizeof (Elf64_External_Dyn),
3376 sizeof (Elf_External_Note),
3377 8, /* hash-table entry size. */
3378 1, /* internal relocations per external relocations. */
3379 64, /* arch_size. */
3380 3, /* log_file_align. */
3381 ELFCLASS64, EV_CURRENT,
3382 bfd_elf64_write_out_phdrs,
3383 bfd_elf64_write_shdrs_and_ehdr,
3384 bfd_elf64_write_relocs,
3385 bfd_elf64_swap_symbol_in,
3386 bfd_elf64_swap_symbol_out,
3387 bfd_elf64_slurp_reloc_table,
3388 bfd_elf64_slurp_symbol_table,
3389 bfd_elf64_swap_dyn_in,
3390 bfd_elf64_swap_dyn_out,
3391 bfd_elf64_swap_reloc_in,
3392 bfd_elf64_swap_reloc_out,
3393 bfd_elf64_swap_reloca_in,
3394 bfd_elf64_swap_reloca_out
3395 };
3396
3397 #define TARGET_BIG_SYM bfd_elf64_s390_vec
3398 #define TARGET_BIG_NAME "elf64-s390"
3399 #define ELF_ARCH bfd_arch_s390
3400 #define ELF_MACHINE_CODE EM_S390
3401 #define ELF_MACHINE_ALT1 EM_S390_OLD
3402 #define ELF_MAXPAGESIZE 0x1000
3403
3404 #define elf_backend_size_info s390_elf64_size_info
3405
3406 #define elf_backend_can_gc_sections 1
3407 #define elf_backend_can_refcount 1
3408 #define elf_backend_want_got_plt 1
3409 #define elf_backend_plt_readonly 1
3410 #define elf_backend_want_plt_sym 0
3411 #define elf_backend_got_header_size 24
3412 #define elf_backend_rela_normal 1
3413
3414 #define elf_info_to_howto elf_s390_info_to_howto
3415
3416 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3417 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3418 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3419
3420 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3421 #define elf_backend_check_relocs elf_s390_check_relocs
3422 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3423 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3424 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3425 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3426 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3427 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3428 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3429 #define elf_backend_relocate_section elf_s390_relocate_section
3430 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3431 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3432
3433 #define bfd_elf64_mkobject elf_s390_mkobject
3434 #define elf_backend_object_p elf_s390_object_p
3435
3436 #include "elf64-target.h"
GDB Binutils - Deliverables
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