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