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2008-06-12 David Edelsohn <edelsohn@gnu.org>
[binutils.git] / bfd / elf64-s390.c
blob820e4632ef100ead05797b85f3b869b17c6e4362
1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
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 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28
29 static reloc_howto_type *elf_s390_reloc_type_lookup
30 PARAMS ((bfd *, bfd_reloc_code_real_type));
31 static void elf_s390_info_to_howto
32 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
33 static bfd_boolean elf_s390_is_local_label_name
34 PARAMS ((bfd *, const char *));
35 static struct bfd_hash_entry *link_hash_newfunc
36 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
37 static struct bfd_link_hash_table *elf_s390_link_hash_table_create
38 PARAMS ((bfd *));
39 static bfd_boolean create_got_section
40 PARAMS((bfd *, struct bfd_link_info *));
41 static bfd_boolean elf_s390_create_dynamic_sections
42 PARAMS((bfd *, struct bfd_link_info *));
43 static void elf_s390_copy_indirect_symbol
44 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *,
45 struct elf_link_hash_entry *));
46 static bfd_boolean elf_s390_check_relocs
47 PARAMS ((bfd *, struct bfd_link_info *, asection *,
48 const Elf_Internal_Rela *));
49 struct elf_s390_link_hash_entry;
50 static void elf_s390_adjust_gotplt
51 PARAMS ((struct elf_s390_link_hash_entry *));
52 static bfd_boolean elf_s390_adjust_dynamic_symbol
53 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
54 static bfd_boolean allocate_dynrelocs
55 PARAMS ((struct elf_link_hash_entry *, PTR));
56 static bfd_boolean readonly_dynrelocs
57 PARAMS ((struct elf_link_hash_entry *, PTR));
58 static bfd_boolean elf_s390_size_dynamic_sections
59 PARAMS ((bfd *, struct bfd_link_info *));
60 static bfd_boolean elf_s390_relocate_section
61 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
62 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
63 static bfd_boolean elf_s390_finish_dynamic_symbol
64 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
65 Elf_Internal_Sym *));
66 static enum elf_reloc_type_class elf_s390_reloc_type_class
67 PARAMS ((const Elf_Internal_Rela *));
68 static bfd_boolean elf_s390_finish_dynamic_sections
69 PARAMS ((bfd *, struct bfd_link_info *));
70 static bfd_boolean elf_s390_object_p
71 PARAMS ((bfd *));
72 static int elf_s390_tls_transition
73 PARAMS ((struct bfd_link_info *, int, int));
74 static bfd_reloc_status_type s390_tls_reloc
75 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
76 static bfd_vma dtpoff_base
77 PARAMS ((struct bfd_link_info *));
78 static bfd_vma tpoff
79 PARAMS ((struct bfd_link_info *, bfd_vma));
80 static void invalid_tls_insn
81 PARAMS ((bfd *, asection *, Elf_Internal_Rela *));
82 static bfd_reloc_status_type s390_elf_ldisp_reloc
83 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
84
85 #include "elf/s390.h"
86
87 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
88 from smaller values. Start with zero, widen, *then* decrement. */
89 #define MINUS_ONE (((bfd_vma)0) - 1)
90
91 /* The relocation "howto" table. */
92 static reloc_howto_type elf_howto_table[] =
93 {
94 HOWTO (R_390_NONE, /* type */
95 0, /* rightshift */
96 0, /* size (0 = byte, 1 = short, 2 = long) */
97 0, /* bitsize */
98 FALSE, /* pc_relative */
99 0, /* bitpos */
100 complain_overflow_dont, /* complain_on_overflow */
101 bfd_elf_generic_reloc, /* special_function */
102 "R_390_NONE", /* name */
103 FALSE, /* partial_inplace */
104 0, /* src_mask */
105 0, /* dst_mask */
106 FALSE), /* pcrel_offset */
107
108 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
110 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
111 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
112 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
113 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
114 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
115 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
116 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
118 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
120 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
122 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
124 HOWTO(R_390_COPY, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,MINUS_ONE, FALSE),
126 HOWTO(R_390_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,MINUS_ONE, FALSE),
128 HOWTO(R_390_JMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,MINUS_ONE, FALSE),
130 HOWTO(R_390_RELATIVE, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,MINUS_ONE, FALSE),
132 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,MINUS_ONE, FALSE),
134 HOWTO(R_390_GOTPC, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
135 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,MINUS_ONE, TRUE),
136 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
137 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
138 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
140 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
142 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
143 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
144 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
146 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
148 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,MINUS_ONE, TRUE),
150 HOWTO(R_390_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_390_64", FALSE, 0,MINUS_ONE, FALSE),
152 HOWTO(R_390_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
153 bfd_elf_generic_reloc, "R_390_PC64", FALSE, 0,MINUS_ONE, TRUE),
154 HOWTO(R_390_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
155 bfd_elf_generic_reloc, "R_390_GOT64", FALSE, 0,MINUS_ONE, FALSE),
156 HOWTO(R_390_PLT64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
157 bfd_elf_generic_reloc, "R_390_PLT64", FALSE, 0,MINUS_ONE, TRUE),
158 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
159 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,MINUS_ONE, TRUE),
160 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
161 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
162 HOWTO(R_390_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
163 bfd_elf_generic_reloc, "R_390_GOTOFF64", FALSE, 0,MINUS_ONE, FALSE),
164 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
165 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
166 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
167 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
168 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
169 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
170 HOWTO(R_390_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
171 bfd_elf_generic_reloc, "R_390_GOTPLT64", FALSE, 0,MINUS_ONE, FALSE),
172 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
173 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,MINUS_ONE, TRUE),
174 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
175 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
176 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
177 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
178 HOWTO(R_390_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
179 bfd_elf_generic_reloc, "R_390_PLTOFF64", FALSE, 0,MINUS_ONE, FALSE),
180 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont,
181 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE),
182 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
183 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE),
184 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
185 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE),
186 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */
187 HOWTO(R_390_TLS_GD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
188 bfd_elf_generic_reloc, "R_390_TLS_GD64", FALSE, 0, MINUS_ONE, FALSE),
189 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
190 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE),
191 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */
192 HOWTO(R_390_TLS_GOTIE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
193 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", FALSE, 0, MINUS_ONE, FALSE),
194 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */
195 HOWTO(R_390_TLS_LDM64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
196 bfd_elf_generic_reloc, "R_390_TLS_LDM64", FALSE, 0, MINUS_ONE, FALSE),
197 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */
198 HOWTO(R_390_TLS_IE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
199 bfd_elf_generic_reloc, "R_390_TLS_IE64", FALSE, 0, MINUS_ONE, FALSE),
200 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
201 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, MINUS_ONE, TRUE),
202 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */
203 HOWTO(R_390_TLS_LE64, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
204 bfd_elf_generic_reloc, "R_390_TLS_LE64", FALSE, 0, MINUS_ONE, FALSE),
205 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */
206 HOWTO(R_390_TLS_LDO64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
207 bfd_elf_generic_reloc, "R_390_TLS_LDO64", FALSE, 0, MINUS_ONE, FALSE),
208 HOWTO(R_390_TLS_DTPMOD, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
209 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, MINUS_ONE, FALSE),
210 HOWTO(R_390_TLS_DTPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
211 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, MINUS_ONE, FALSE),
212 HOWTO(R_390_TLS_TPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
213 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, MINUS_ONE, FALSE),
214 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
215 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE),
216 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
217 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE),
218 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
219 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE),
220 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
221 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE),
222 };
223
224 /* GNU extension to record C++ vtable hierarchy. */
225 static reloc_howto_type elf64_s390_vtinherit_howto =
226 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
227 static reloc_howto_type elf64_s390_vtentry_howto =
228 HOWTO (R_390_GNU_VTENTRY, 0,4,0,FALSE,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", FALSE,0,0, FALSE);
229
230 static reloc_howto_type *
231 elf_s390_reloc_type_lookup (abfd, code)
232 bfd *abfd ATTRIBUTE_UNUSED;
233 bfd_reloc_code_real_type code;
234 {
235 switch (code)
236 {
237 case BFD_RELOC_NONE:
238 return &elf_howto_table[(int) R_390_NONE];
239 case BFD_RELOC_8:
240 return &elf_howto_table[(int) R_390_8];
241 case BFD_RELOC_390_12:
242 return &elf_howto_table[(int) R_390_12];
243 case BFD_RELOC_16:
244 return &elf_howto_table[(int) R_390_16];
245 case BFD_RELOC_32:
246 return &elf_howto_table[(int) R_390_32];
247 case BFD_RELOC_CTOR:
248 return &elf_howto_table[(int) R_390_32];
249 case BFD_RELOC_32_PCREL:
250 return &elf_howto_table[(int) R_390_PC32];
251 case BFD_RELOC_390_GOT12:
252 return &elf_howto_table[(int) R_390_GOT12];
253 case BFD_RELOC_32_GOT_PCREL:
254 return &elf_howto_table[(int) R_390_GOT32];
255 case BFD_RELOC_390_PLT32:
256 return &elf_howto_table[(int) R_390_PLT32];
257 case BFD_RELOC_390_COPY:
258 return &elf_howto_table[(int) R_390_COPY];
259 case BFD_RELOC_390_GLOB_DAT:
260 return &elf_howto_table[(int) R_390_GLOB_DAT];
261 case BFD_RELOC_390_JMP_SLOT:
262 return &elf_howto_table[(int) R_390_JMP_SLOT];
263 case BFD_RELOC_390_RELATIVE:
264 return &elf_howto_table[(int) R_390_RELATIVE];
265 case BFD_RELOC_32_GOTOFF:
266 return &elf_howto_table[(int) R_390_GOTOFF32];
267 case BFD_RELOC_390_GOTPC:
268 return &elf_howto_table[(int) R_390_GOTPC];
269 case BFD_RELOC_390_GOT16:
270 return &elf_howto_table[(int) R_390_GOT16];
271 case BFD_RELOC_16_PCREL:
272 return &elf_howto_table[(int) R_390_PC16];
273 case BFD_RELOC_390_PC16DBL:
274 return &elf_howto_table[(int) R_390_PC16DBL];
275 case BFD_RELOC_390_PLT16DBL:
276 return &elf_howto_table[(int) R_390_PLT16DBL];
277 case BFD_RELOC_390_PC32DBL:
278 return &elf_howto_table[(int) R_390_PC32DBL];
279 case BFD_RELOC_390_PLT32DBL:
280 return &elf_howto_table[(int) R_390_PLT32DBL];
281 case BFD_RELOC_390_GOTPCDBL:
282 return &elf_howto_table[(int) R_390_GOTPCDBL];
283 case BFD_RELOC_64:
284 return &elf_howto_table[(int) R_390_64];
285 case BFD_RELOC_64_PCREL:
286 return &elf_howto_table[(int) R_390_PC64];
287 case BFD_RELOC_390_GOT64:
288 return &elf_howto_table[(int) R_390_GOT64];
289 case BFD_RELOC_390_PLT64:
290 return &elf_howto_table[(int) R_390_PLT64];
291 case BFD_RELOC_390_GOTENT:
292 return &elf_howto_table[(int) R_390_GOTENT];
293 case BFD_RELOC_16_GOTOFF:
294 return &elf_howto_table[(int) R_390_GOTOFF16];
295 case BFD_RELOC_390_GOTOFF64:
296 return &elf_howto_table[(int) R_390_GOTOFF64];
297 case BFD_RELOC_390_GOTPLT12:
298 return &elf_howto_table[(int) R_390_GOTPLT12];
299 case BFD_RELOC_390_GOTPLT16:
300 return &elf_howto_table[(int) R_390_GOTPLT16];
301 case BFD_RELOC_390_GOTPLT32:
302 return &elf_howto_table[(int) R_390_GOTPLT32];
303 case BFD_RELOC_390_GOTPLT64:
304 return &elf_howto_table[(int) R_390_GOTPLT64];
305 case BFD_RELOC_390_GOTPLTENT:
306 return &elf_howto_table[(int) R_390_GOTPLTENT];
307 case BFD_RELOC_390_PLTOFF16:
308 return &elf_howto_table[(int) R_390_PLTOFF16];
309 case BFD_RELOC_390_PLTOFF32:
310 return &elf_howto_table[(int) R_390_PLTOFF32];
311 case BFD_RELOC_390_PLTOFF64:
312 return &elf_howto_table[(int) R_390_PLTOFF64];
313 case BFD_RELOC_390_TLS_LOAD:
314 return &elf_howto_table[(int) R_390_TLS_LOAD];
315 case BFD_RELOC_390_TLS_GDCALL:
316 return &elf_howto_table[(int) R_390_TLS_GDCALL];
317 case BFD_RELOC_390_TLS_LDCALL:
318 return &elf_howto_table[(int) R_390_TLS_LDCALL];
319 case BFD_RELOC_390_TLS_GD64:
320 return &elf_howto_table[(int) R_390_TLS_GD64];
321 case BFD_RELOC_390_TLS_GOTIE12:
322 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
323 case BFD_RELOC_390_TLS_GOTIE64:
324 return &elf_howto_table[(int) R_390_TLS_GOTIE64];
325 case BFD_RELOC_390_TLS_LDM64:
326 return &elf_howto_table[(int) R_390_TLS_LDM64];
327 case BFD_RELOC_390_TLS_IE64:
328 return &elf_howto_table[(int) R_390_TLS_IE64];
329 case BFD_RELOC_390_TLS_IEENT:
330 return &elf_howto_table[(int) R_390_TLS_IEENT];
331 case BFD_RELOC_390_TLS_LE64:
332 return &elf_howto_table[(int) R_390_TLS_LE64];
333 case BFD_RELOC_390_TLS_LDO64:
334 return &elf_howto_table[(int) R_390_TLS_LDO64];
335 case BFD_RELOC_390_TLS_DTPMOD:
336 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
337 case BFD_RELOC_390_TLS_DTPOFF:
338 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
339 case BFD_RELOC_390_TLS_TPOFF:
340 return &elf_howto_table[(int) R_390_TLS_TPOFF];
341 case BFD_RELOC_390_20:
342 return &elf_howto_table[(int) R_390_20];
343 case BFD_RELOC_390_GOT20:
344 return &elf_howto_table[(int) R_390_GOT20];
345 case BFD_RELOC_390_GOTPLT20:
346 return &elf_howto_table[(int) R_390_GOTPLT20];
347 case BFD_RELOC_390_TLS_GOTIE20:
348 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
349 case BFD_RELOC_VTABLE_INHERIT:
350 return &elf64_s390_vtinherit_howto;
351 case BFD_RELOC_VTABLE_ENTRY:
352 return &elf64_s390_vtentry_howto;
353 default:
354 break;
355 }
356 return 0;
357 }
358
359 static reloc_howto_type *
360 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
361 const char *r_name)
362 {
363 unsigned int i;
364
365 for (i = 0;
366 i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]);
367 i++)
368 if (elf_howto_table[i].name != NULL
369 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
370 return &elf_howto_table[i];
371
372 if (strcasecmp (elf64_s390_vtinherit_howto.name, r_name) == 0)
373 return &elf64_s390_vtinherit_howto;
374 if (strcasecmp (elf64_s390_vtentry_howto.name, r_name) == 0)
375 return &elf64_s390_vtentry_howto;
376
377 return NULL;
378 }
379
380 /* We need to use ELF64_R_TYPE so we have our own copy of this function,
381 and elf64-s390.c has its own copy. */
382
383 static void
384 elf_s390_info_to_howto (abfd, cache_ptr, dst)
385 bfd *abfd ATTRIBUTE_UNUSED;
386 arelent *cache_ptr;
387 Elf_Internal_Rela *dst;
388 {
389 unsigned int r_type = ELF64_R_TYPE(dst->r_info);
390 switch (r_type)
391 {
392 case R_390_GNU_VTINHERIT:
393 cache_ptr->howto = &elf64_s390_vtinherit_howto;
394 break;
395
396 case R_390_GNU_VTENTRY:
397 cache_ptr->howto = &elf64_s390_vtentry_howto;
398 break;
399
400 default:
401 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
402 {
403 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
404 abfd, (int) r_type);
405 r_type = R_390_NONE;
406 }
407 cache_ptr->howto = &elf_howto_table[r_type];
408 }
409 }
410
411 /* A relocation function which doesn't do anything. */
412 static bfd_reloc_status_type
413 s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section,
414 output_bfd, error_message)
415 bfd *abfd ATTRIBUTE_UNUSED;
416 arelent *reloc_entry;
417 asymbol *symbol ATTRIBUTE_UNUSED;
418 PTR data ATTRIBUTE_UNUSED;
419 asection *input_section;
420 bfd *output_bfd;
421 char **error_message ATTRIBUTE_UNUSED;
422 {
423 if (output_bfd)
424 reloc_entry->address += input_section->output_offset;
425 return bfd_reloc_ok;
426 }
427
428 /* Handle the large displacement relocs. */
429 static bfd_reloc_status_type
430 s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section,
431 output_bfd, error_message)
432 bfd *abfd;
433 arelent *reloc_entry;
434 asymbol *symbol;
435 PTR data;
436 asection *input_section;
437 bfd *output_bfd;
438 char **error_message ATTRIBUTE_UNUSED;
439 {
440 reloc_howto_type *howto = reloc_entry->howto;
441 bfd_vma relocation;
442 bfd_vma insn;
443
444 if (output_bfd != (bfd *) NULL
445 && (symbol->flags & BSF_SECTION_SYM) == 0
446 && (! howto->partial_inplace
447 || reloc_entry->addend == 0))
448 {
449 reloc_entry->address += input_section->output_offset;
450 return bfd_reloc_ok;
451 }
452 if (output_bfd != NULL)
453 return bfd_reloc_continue;
454
455 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
456 return bfd_reloc_outofrange;
457
458 relocation = (symbol->value
459 + symbol->section->output_section->vma
460 + symbol->section->output_offset);
461 relocation += reloc_entry->addend;
462 if (howto->pc_relative)
463 {
464 relocation -= (input_section->output_section->vma
465 + input_section->output_offset);
466 relocation -= reloc_entry->address;
467 }
468
469 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
470 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
471 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
472
473 if ((bfd_signed_vma) relocation < - 0x80000
474 || (bfd_signed_vma) relocation > 0x7ffff)
475 return bfd_reloc_overflow;
476 else
477 return bfd_reloc_ok;
478 }
479
480 static bfd_boolean
481 elf_s390_is_local_label_name (abfd, name)
482 bfd *abfd;
483 const char *name;
484 {
485 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
486 return TRUE;
487
488 return _bfd_elf_is_local_label_name (abfd, name);
489 }
490
491 /* Functions for the 390 ELF linker. */
492
493 /* The name of the dynamic interpreter. This is put in the .interp
494 section. */
495
496 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
497
498 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
499 copying dynamic variables from a shared lib into an app's dynbss
500 section, and instead use a dynamic relocation to point into the
501 shared lib. */
502 #define ELIMINATE_COPY_RELOCS 1
503
504 /* The size in bytes of the first entry in the procedure linkage table. */
505 #define PLT_FIRST_ENTRY_SIZE 32
506 /* The size in bytes of an entry in the procedure linkage table. */
507 #define PLT_ENTRY_SIZE 32
508
509 #define GOT_ENTRY_SIZE 8
510
511 /* The first three entries in a procedure linkage table are reserved,
512 and the initial contents are unimportant (we zero them out).
513 Subsequent entries look like this. See the SVR4 ABI 386
514 supplement to see how this works. */
515
516 /* For the s390, simple addr offset can only be 0 - 4096.
517 To use the full 16777216 TB address space, several instructions
518 are needed to load an address in a register and execute
519 a branch( or just saving the address)
520
521 Furthermore, only r 0 and 1 are free to use!!! */
522
523 /* The first 3 words in the GOT are then reserved.
524 Word 0 is the address of the dynamic table.
525 Word 1 is a pointer to a structure describing the object
526 Word 2 is used to point to the loader entry address.
527
528 The code for PLT entries looks like this:
529
530 The GOT holds the address in the PLT to be executed.
531 The loader then gets:
532 24(15) = Pointer to the structure describing the object.
533 28(15) = Offset in symbol table
534 The loader must then find the module where the function is
535 and insert the address in the GOT.
536
537 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
538 LG 1,0(1) # 6 bytes Load address from GOT in r1
539 BCR 15,1 # 2 bytes Jump to address
540 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
541 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1
542 BRCL 15,-x # 6 bytes Jump to start of PLT
543 .long ? # 4 bytes offset into symbol table
544
545 Total = 32 bytes per PLT entry
546 Fixup at offset 2: relative address to GOT entry
547 Fixup at offset 22: relative branch to PLT0
548 Fixup at offset 28: 32 bit offset into symbol table
549
550 A 32 bit offset into the symbol table is enough. It allows for symbol
551 tables up to a size of 2 gigabyte. A single dynamic object (the main
552 program, any shared library) is limited to 4GB in size and I want to see
553 the program that manages to have a symbol table of more than 2 GB with a
554 total size of at max 4 GB. */
555
556 #define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000
557 #define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310
558 #define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004
559 #define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10
560 #define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c
561 #define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4
562 #define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000
563 #define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000
564
565 /* The first PLT entry pushes the offset into the symbol table
566 from R1 onto the stack at 8(15) and the loader object info
567 at 12(15), loads the loader address in R1 and jumps to it. */
568
569 /* The first entry in the PLT:
570
571 PLT0:
572 STG 1,56(15) # r1 contains the offset into the symbol table
573 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
574 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
575 LG 1,16(1) # get entry address of loader
576 BCR 15,1 # jump to loader
577
578 Fixup at offset 8: relative address to start of GOT. */
579
580 #define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038
581 #define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010
582 #define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000
583 #define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030
584 #define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310
585 #define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004
586 #define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700
587 #define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700
588
589 /* The s390 linker needs to keep track of the number of relocs that it
590 decides to copy as dynamic relocs in check_relocs for each symbol.
591 This is so that it can later discard them if they are found to be
592 unnecessary. We store the information in a field extending the
593 regular ELF linker hash table. */
594
595 struct elf_s390_dyn_relocs
596 {
597 struct elf_s390_dyn_relocs *next;
598
599 /* The input section of the reloc. */
600 asection *sec;
601
602 /* Total number of relocs copied for the input section. */
603 bfd_size_type count;
604
605 /* Number of pc-relative relocs copied for the input section. */
606 bfd_size_type pc_count;
607 };
608
609 /* s390 ELF linker hash entry. */
610
611 struct elf_s390_link_hash_entry
612 {
613 struct elf_link_hash_entry elf;
614
615 /* Track dynamic relocs copied for this symbol. */
616 struct elf_s390_dyn_relocs *dyn_relocs;
617
618 /* Number of GOTPLT references for a function. */
619 bfd_signed_vma gotplt_refcount;
620
621 #define GOT_UNKNOWN 0
622 #define GOT_NORMAL 1
623 #define GOT_TLS_GD 2
624 #define GOT_TLS_IE 3
625 #define GOT_TLS_IE_NLT 3
626 unsigned char tls_type;
627 };
628
629 #define elf_s390_hash_entry(ent) \
630 ((struct elf_s390_link_hash_entry *)(ent))
631
632 /* NOTE: Keep this structure in sync with
633 the one declared in elf32-s390.c. */
634 struct elf_s390_obj_tdata
635 {
636 struct elf_obj_tdata root;
637
638 /* TLS type for each local got entry. */
639 char *local_got_tls_type;
640 };
641
642 #define elf_s390_tdata(abfd) \
643 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
644
645 #define elf_s390_local_got_tls_type(abfd) \
646 (elf_s390_tdata (abfd)->local_got_tls_type)
647
648 #define is_s390_elf(bfd) \
649 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
650 && elf_tdata (bfd) != NULL \
651 && elf_object_id (bfd) == S390_ELF_TDATA)
652
653 static bfd_boolean
654 elf_s390_mkobject (bfd *abfd)
655 {
656 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata),
657 S390_ELF_TDATA);
658 }
659
660 static bfd_boolean
661 elf_s390_object_p (abfd)
662 bfd *abfd;
663 {
664 /* Set the right machine number for an s390 elf32 file. */
665 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
666 }
667
668 /* s390 ELF linker hash table. */
669
670 struct elf_s390_link_hash_table
671 {
672 struct elf_link_hash_table elf;
673
674 /* Short-cuts to get to dynamic linker sections. */
675 asection *sgot;
676 asection *sgotplt;
677 asection *srelgot;
678 asection *splt;
679 asection *srelplt;
680 asection *sdynbss;
681 asection *srelbss;
682
683 union {
684 bfd_signed_vma refcount;
685 bfd_vma offset;
686 } tls_ldm_got;
687
688 /* Small local sym to section mapping cache. */
689 struct sym_sec_cache sym_sec;
690 };
691
692 /* Get the s390 ELF linker hash table from a link_info structure. */
693
694 #define elf_s390_hash_table(p) \
695 ((struct elf_s390_link_hash_table *) ((p)->hash))
696
697 /* Create an entry in an s390 ELF linker hash table. */
698
699 static struct bfd_hash_entry *
700 link_hash_newfunc (entry, table, string)
701 struct bfd_hash_entry *entry;
702 struct bfd_hash_table *table;
703 const char *string;
704 {
705 /* Allocate the structure if it has not already been allocated by a
706 subclass. */
707 if (entry == NULL)
708 {
709 entry = bfd_hash_allocate (table,
710 sizeof (struct elf_s390_link_hash_entry));
711 if (entry == NULL)
712 return entry;
713 }
714
715 /* Call the allocation method of the superclass. */
716 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
717 if (entry != NULL)
718 {
719 struct elf_s390_link_hash_entry *eh;
720
721 eh = (struct elf_s390_link_hash_entry *) entry;
722 eh->dyn_relocs = NULL;
723 eh->gotplt_refcount = 0;
724 eh->tls_type = GOT_UNKNOWN;
725 }
726
727 return entry;
728 }
729
730 /* Create an s390 ELF linker hash table. */
731
732 static struct bfd_link_hash_table *
733 elf_s390_link_hash_table_create (abfd)
734 bfd *abfd;
735 {
736 struct elf_s390_link_hash_table *ret;
737 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
738
739 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
740 if (ret == NULL)
741 return NULL;
742
743 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
744 sizeof (struct elf_s390_link_hash_entry)))
745 {
746 free (ret);
747 return NULL;
748 }
749
750 ret->sgot = NULL;
751 ret->sgotplt = NULL;
752 ret->srelgot = NULL;
753 ret->splt = NULL;
754 ret->srelplt = NULL;
755 ret->sdynbss = NULL;
756 ret->srelbss = NULL;
757 ret->tls_ldm_got.refcount = 0;
758 ret->sym_sec.abfd = NULL;
759
760 return &ret->elf.root;
761 }
762
763 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
764 shortcuts to them in our hash table. */
765
766 static bfd_boolean
767 create_got_section (dynobj, info)
768 bfd *dynobj;
769 struct bfd_link_info *info;
770 {
771 struct elf_s390_link_hash_table *htab;
772
773 if (! _bfd_elf_create_got_section (dynobj, info))
774 return FALSE;
775
776 htab = elf_s390_hash_table (info);
777 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
778 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
779 if (!htab->sgot || !htab->sgotplt)
780 abort ();
781
782 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got",
783 (SEC_ALLOC | SEC_LOAD
784 | SEC_HAS_CONTENTS
785 | SEC_IN_MEMORY
786 | SEC_LINKER_CREATED
787 | SEC_READONLY));
788 if (htab->srelgot == NULL
789 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3))
790 return FALSE;
791 return TRUE;
792 }
793
794 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
795 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
796 hash table. */
797
798 static bfd_boolean
799 elf_s390_create_dynamic_sections (dynobj, info)
800 bfd *dynobj;
801 struct bfd_link_info *info;
802 {
803 struct elf_s390_link_hash_table *htab;
804
805 htab = elf_s390_hash_table (info);
806 if (!htab->sgot && !create_got_section (dynobj, info))
807 return FALSE;
808
809 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
810 return FALSE;
811
812 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
813 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
814 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
815 if (!info->shared)
816 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
817
818 if (!htab->splt || !htab->srelplt || !htab->sdynbss
819 || (!info->shared && !htab->srelbss))
820 abort ();
821
822 return TRUE;
823 }
824
825 /* Copy the extra info we tack onto an elf_link_hash_entry. */
826
827 static void
828 elf_s390_copy_indirect_symbol (info, dir, ind)
829 struct bfd_link_info *info;
830 struct elf_link_hash_entry *dir, *ind;
831 {
832 struct elf_s390_link_hash_entry *edir, *eind;
833
834 edir = (struct elf_s390_link_hash_entry *) dir;
835 eind = (struct elf_s390_link_hash_entry *) ind;
836
837 if (eind->dyn_relocs != NULL)
838 {
839 if (edir->dyn_relocs != NULL)
840 {
841 struct elf_s390_dyn_relocs **pp;
842 struct elf_s390_dyn_relocs *p;
843
844 /* Add reloc counts against the indirect sym to the direct sym
845 list. Merge any entries against the same section. */
846 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
847 {
848 struct elf_s390_dyn_relocs *q;
849
850 for (q = edir->dyn_relocs; q != NULL; q = q->next)
851 if (q->sec == p->sec)
852 {
853 q->pc_count += p->pc_count;
854 q->count += p->count;
855 *pp = p->next;
856 break;
857 }
858 if (q == NULL)
859 pp = &p->next;
860 }
861 *pp = edir->dyn_relocs;
862 }
863
864 edir->dyn_relocs = eind->dyn_relocs;
865 eind->dyn_relocs = NULL;
866 }
867
868 if (ind->root.type == bfd_link_hash_indirect
869 && dir->got.refcount <= 0)
870 {
871 edir->tls_type = eind->tls_type;
872 eind->tls_type = GOT_UNKNOWN;
873 }
874
875 if (ELIMINATE_COPY_RELOCS
876 && ind->root.type != bfd_link_hash_indirect
877 && dir->dynamic_adjusted)
878 {
879 /* If called to transfer flags for a weakdef during processing
880 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
881 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
882 dir->ref_dynamic |= ind->ref_dynamic;
883 dir->ref_regular |= ind->ref_regular;
884 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
885 dir->needs_plt |= ind->needs_plt;
886 }
887 else
888 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
889 }
890
891 static int
892 elf_s390_tls_transition (info, r_type, is_local)
893 struct bfd_link_info *info;
894 int r_type;
895 int is_local;
896 {
897 if (info->shared)
898 return r_type;
899
900 switch (r_type)
901 {
902 case R_390_TLS_GD64:
903 case R_390_TLS_IE64:
904 if (is_local)
905 return R_390_TLS_LE64;
906 return R_390_TLS_IE64;
907 case R_390_TLS_GOTIE64:
908 if (is_local)
909 return R_390_TLS_LE64;
910 return R_390_TLS_GOTIE64;
911 case R_390_TLS_LDM64:
912 return R_390_TLS_LE64;
913 }
914
915 return r_type;
916 }
917
918 /* Look through the relocs for a section during the first phase, and
919 allocate space in the global offset table or procedure linkage
920 table. */
921
922 static bfd_boolean
923 elf_s390_check_relocs (abfd, info, sec, relocs)
924 bfd *abfd;
925 struct bfd_link_info *info;
926 asection *sec;
927 const Elf_Internal_Rela *relocs;
928 {
929 struct elf_s390_link_hash_table *htab;
930 Elf_Internal_Shdr *symtab_hdr;
931 struct elf_link_hash_entry **sym_hashes;
932 const Elf_Internal_Rela *rel;
933 const Elf_Internal_Rela *rel_end;
934 asection *sreloc;
935 bfd_signed_vma *local_got_refcounts;
936 int tls_type, old_tls_type;
937
938 if (info->relocatable)
939 return TRUE;
940
941 BFD_ASSERT (is_s390_elf (abfd));
942
943 htab = elf_s390_hash_table (info);
944 symtab_hdr = &elf_symtab_hdr (abfd);
945 sym_hashes = elf_sym_hashes (abfd);
946 local_got_refcounts = elf_local_got_refcounts (abfd);
947
948 sreloc = NULL;
949
950 rel_end = relocs + sec->reloc_count;
951 for (rel = relocs; rel < rel_end; rel++)
952 {
953 unsigned int r_type;
954 unsigned long r_symndx;
955 struct elf_link_hash_entry *h;
956
957 r_symndx = ELF64_R_SYM (rel->r_info);
958
959 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
960 {
961 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
962 abfd,
963 r_symndx);
964 return FALSE;
965 }
966
967 if (r_symndx < symtab_hdr->sh_info)
968 h = NULL;
969 else
970 {
971 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
972 while (h->root.type == bfd_link_hash_indirect
973 || h->root.type == bfd_link_hash_warning)
974 h = (struct elf_link_hash_entry *) h->root.u.i.link;
975 }
976
977 /* Create got section and local_got_refcounts array if they
978 are needed. */
979 r_type = elf_s390_tls_transition (info,
980 ELF64_R_TYPE (rel->r_info),
981 h == NULL);
982 switch (r_type)
983 {
984 case R_390_GOT12:
985 case R_390_GOT16:
986 case R_390_GOT20:
987 case R_390_GOT32:
988 case R_390_GOT64:
989 case R_390_GOTENT:
990 case R_390_GOTPLT12:
991 case R_390_GOTPLT16:
992 case R_390_GOTPLT20:
993 case R_390_GOTPLT32:
994 case R_390_GOTPLT64:
995 case R_390_GOTPLTENT:
996 case R_390_TLS_GD64:
997 case R_390_TLS_GOTIE12:
998 case R_390_TLS_GOTIE20:
999 case R_390_TLS_GOTIE64:
1000 case R_390_TLS_IEENT:
1001 case R_390_TLS_IE64:
1002 case R_390_TLS_LDM64:
1003 if (h == NULL
1004 && local_got_refcounts == NULL)
1005 {
1006 bfd_size_type size;
1007
1008 size = symtab_hdr->sh_info;
1009 size *= (sizeof (bfd_signed_vma) + sizeof(char));
1010 local_got_refcounts = ((bfd_signed_vma *)
1011 bfd_zalloc (abfd, size));
1012 if (local_got_refcounts == NULL)
1013 return FALSE;
1014 elf_local_got_refcounts (abfd) = local_got_refcounts;
1015 elf_s390_local_got_tls_type (abfd)
1016 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1017 }
1018 /* Fall through. */
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 if (htab->sgot == NULL)
1025 {
1026 if (htab->elf.dynobj == NULL)
1027 htab->elf.dynobj = abfd;
1028 if (!create_got_section (htab->elf.dynobj, info))
1029 return FALSE;
1030 }
1031 }
1032
1033 switch (r_type)
1034 {
1035 case R_390_GOTOFF16:
1036 case R_390_GOTOFF32:
1037 case R_390_GOTOFF64:
1038 case R_390_GOTPC:
1039 case R_390_GOTPCDBL:
1040 /* Got is created, nothing to be done. */
1041 break;
1042
1043 case R_390_PLT16DBL:
1044 case R_390_PLT32:
1045 case R_390_PLT32DBL:
1046 case R_390_PLT64:
1047 case R_390_PLTOFF16:
1048 case R_390_PLTOFF32:
1049 case R_390_PLTOFF64:
1050 /* This symbol requires a procedure linkage table entry. We
1051 actually build the entry in adjust_dynamic_symbol,
1052 because this might be a case of linking PIC code which is
1053 never referenced by a dynamic object, in which case we
1054 don't need to generate a procedure linkage table entry
1055 after all. */
1056
1057 /* If this is a local symbol, we resolve it directly without
1058 creating a procedure linkage table entry. */
1059 if (h != NULL)
1060 {
1061 h->needs_plt = 1;
1062 h->plt.refcount += 1;
1063 }
1064 break;
1065
1066 case R_390_GOTPLT12:
1067 case R_390_GOTPLT16:
1068 case R_390_GOTPLT20:
1069 case R_390_GOTPLT32:
1070 case R_390_GOTPLT64:
1071 case R_390_GOTPLTENT:
1072 /* This symbol requires either a procedure linkage table entry
1073 or an entry in the local got. We actually build the entry
1074 in adjust_dynamic_symbol because whether this is really a
1075 global reference can change and with it the fact if we have
1076 to create a plt entry or a local got entry. To be able to
1077 make a once global symbol a local one we have to keep track
1078 of the number of gotplt references that exist for this
1079 symbol. */
1080 if (h != NULL)
1081 {
1082 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1083 h->needs_plt = 1;
1084 h->plt.refcount += 1;
1085 }
1086 else
1087 local_got_refcounts[r_symndx] += 1;
1088 break;
1089
1090 case R_390_TLS_LDM64:
1091 htab->tls_ldm_got.refcount += 1;
1092 break;
1093
1094 case R_390_TLS_IE64:
1095 case R_390_TLS_GOTIE12:
1096 case R_390_TLS_GOTIE20:
1097 case R_390_TLS_GOTIE64:
1098 case R_390_TLS_IEENT:
1099 if (info->shared)
1100 info->flags |= DF_STATIC_TLS;
1101 /* Fall through */
1102
1103 case R_390_GOT12:
1104 case R_390_GOT16:
1105 case R_390_GOT20:
1106 case R_390_GOT32:
1107 case R_390_GOT64:
1108 case R_390_GOTENT:
1109 case R_390_TLS_GD64:
1110 /* This symbol requires a global offset table entry. */
1111 switch (r_type)
1112 {
1113 default:
1114 case R_390_GOT12:
1115 case R_390_GOT16:
1116 case R_390_GOT20:
1117 case R_390_GOT32:
1118 case R_390_GOTENT:
1119 tls_type = GOT_NORMAL;
1120 break;
1121 case R_390_TLS_GD64:
1122 tls_type = GOT_TLS_GD;
1123 break;
1124 case R_390_TLS_IE64:
1125 case R_390_TLS_GOTIE64:
1126 tls_type = GOT_TLS_IE;
1127 break;
1128 case R_390_TLS_GOTIE12:
1129 case R_390_TLS_GOTIE20:
1130 case R_390_TLS_IEENT:
1131 tls_type = GOT_TLS_IE_NLT;
1132 break;
1133 }
1134
1135 if (h != NULL)
1136 {
1137 h->got.refcount += 1;
1138 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1139 }
1140 else
1141 {
1142 local_got_refcounts[r_symndx] += 1;
1143 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1144 }
1145 /* If a TLS symbol is accessed using IE at least once,
1146 there is no point to use dynamic model for it. */
1147 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1148 {
1149 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1150 {
1151 (*_bfd_error_handler)
1152 (_("%B: `%s' accessed both as normal and thread local symbol"),
1153 abfd, h->root.root.string);
1154 return FALSE;
1155 }
1156 if (old_tls_type > tls_type)
1157 tls_type = old_tls_type;
1158 }
1159
1160 if (old_tls_type != tls_type)
1161 {
1162 if (h != NULL)
1163 elf_s390_hash_entry (h)->tls_type = tls_type;
1164 else
1165 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1166 }
1167
1168 if (r_type != R_390_TLS_IE64)
1169 break;
1170 /* Fall through */
1171
1172 case R_390_TLS_LE64:
1173 if (!info->shared)
1174 break;
1175 info->flags |= DF_STATIC_TLS;
1176 /* Fall through */
1177
1178 case R_390_8:
1179 case R_390_16:
1180 case R_390_32:
1181 case R_390_64:
1182 case R_390_PC16:
1183 case R_390_PC16DBL:
1184 case R_390_PC32:
1185 case R_390_PC32DBL:
1186 case R_390_PC64:
1187 if (h != NULL && !info->shared)
1188 {
1189 /* If this reloc is in a read-only section, we might
1190 need a copy reloc. We can't check reliably at this
1191 stage whether the section is read-only, as input
1192 sections have not yet been mapped to output sections.
1193 Tentatively set the flag for now, and correct in
1194 adjust_dynamic_symbol. */
1195 h->non_got_ref = 1;
1196
1197 /* We may need a .plt entry if the function this reloc
1198 refers to is in a shared lib. */
1199 h->plt.refcount += 1;
1200 }
1201
1202 /* If we are creating a shared library, and this is a reloc
1203 against a global symbol, or a non PC relative reloc
1204 against a local symbol, then we need to copy the reloc
1205 into the shared library. However, if we are linking with
1206 -Bsymbolic, we do not need to copy a reloc against a
1207 global symbol which is defined in an object we are
1208 including in the link (i.e., DEF_REGULAR is set). At
1209 this point we have not seen all the input files, so it is
1210 possible that DEF_REGULAR is not set now but will be set
1211 later (it is never cleared). In case of a weak definition,
1212 DEF_REGULAR may be cleared later by a strong definition in
1213 a shared library. We account for that possibility below by
1214 storing information in the relocs_copied field of the hash
1215 table entry. A similar situation occurs when creating
1216 shared libraries and symbol visibility changes render the
1217 symbol local.
1218
1219 If on the other hand, we are creating an executable, we
1220 may need to keep relocations for symbols satisfied by a
1221 dynamic library if we manage to avoid copy relocs for the
1222 symbol. */
1223 if ((info->shared
1224 && (sec->flags & SEC_ALLOC) != 0
1225 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
1226 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
1227 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
1228 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
1229 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
1230 || (h != NULL
1231 && (! info->symbolic
1232 || h->root.type == bfd_link_hash_defweak
1233 || !h->def_regular))))
1234 || (ELIMINATE_COPY_RELOCS
1235 && !info->shared
1236 && (sec->flags & SEC_ALLOC) != 0
1237 && h != NULL
1238 && (h->root.type == bfd_link_hash_defweak
1239 || !h->def_regular)))
1240 {
1241 struct elf_s390_dyn_relocs *p;
1242 struct elf_s390_dyn_relocs **head;
1243
1244 /* We must copy these reloc types into the output file.
1245 Create a reloc section in dynobj and make room for
1246 this reloc. */
1247 if (sreloc == NULL)
1248 {
1249 const char *name;
1250 bfd *dynobj;
1251
1252 name = (bfd_elf_string_from_elf_section
1253 (abfd,
1254 elf_elfheader (abfd)->e_shstrndx,
1255 elf_section_data (sec)->rel_hdr.sh_name));
1256 if (name == NULL)
1257 return FALSE;
1258
1259 if (! CONST_STRNEQ (name, ".rela")
1260 || strcmp (bfd_get_section_name (abfd, sec),
1261 name + 5) != 0)
1262 {
1263 (*_bfd_error_handler)
1264 (_("%B: bad relocation section name `%s\'"),
1265 abfd, name);
1266 }
1267
1268 if (htab->elf.dynobj == NULL)
1269 htab->elf.dynobj = abfd;
1270
1271 dynobj = htab->elf.dynobj;
1272 sreloc = bfd_get_section_by_name (dynobj, name);
1273 if (sreloc == NULL)
1274 {
1275 flagword flags;
1276
1277 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1278 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1279 if ((sec->flags & SEC_ALLOC) != 0)
1280 flags |= SEC_ALLOC | SEC_LOAD;
1281 sreloc = bfd_make_section_with_flags (dynobj,
1282 name,
1283 flags);
1284 if (sreloc == NULL
1285 || ! bfd_set_section_alignment (dynobj, sreloc, 3))
1286 return FALSE;
1287 }
1288 elf_section_data (sec)->sreloc = sreloc;
1289 }
1290
1291 /* If this is a global symbol, we count the number of
1292 relocations we need for this symbol. */
1293 if (h != NULL)
1294 {
1295 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1296 }
1297 else
1298 {
1299 /* Track dynamic relocs needed for local syms too.
1300 We really need local syms available to do this
1301 easily. Oh well. */
1302
1303 asection *s;
1304 void *vpp;
1305
1306 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1307 sec, r_symndx);
1308 if (s == NULL)
1309 return FALSE;
1310
1311 vpp = &elf_section_data (s)->local_dynrel;
1312 head = (struct elf_s390_dyn_relocs **) vpp;
1313 }
1314
1315 p = *head;
1316 if (p == NULL || p->sec != sec)
1317 {
1318 bfd_size_type amt = sizeof *p;
1319 p = ((struct elf_s390_dyn_relocs *)
1320 bfd_alloc (htab->elf.dynobj, amt));
1321 if (p == NULL)
1322 return FALSE;
1323 p->next = *head;
1324 *head = p;
1325 p->sec = sec;
1326 p->count = 0;
1327 p->pc_count = 0;
1328 }
1329
1330 p->count += 1;
1331 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
1332 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1333 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
1334 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
1335 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
1336 p->pc_count += 1;
1337 }
1338 break;
1339
1340 /* This relocation describes the C++ object vtable hierarchy.
1341 Reconstruct it for later use during GC. */
1342 case R_390_GNU_VTINHERIT:
1343 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1344 return FALSE;
1345 break;
1346
1347 /* This relocation describes which C++ vtable entries are actually
1348 used. Record for later use during GC. */
1349 case R_390_GNU_VTENTRY:
1350 BFD_ASSERT (h != NULL);
1351 if (h != NULL
1352 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1353 return FALSE;
1354 break;
1355
1356 default:
1357 break;
1358 }
1359 }
1360
1361 return TRUE;
1362 }
1363
1364 /* Return the section that should be marked against GC for a given
1365 relocation. */
1366
1367 static asection *
1368 elf_s390_gc_mark_hook (asection *sec,
1369 struct bfd_link_info *info,
1370 Elf_Internal_Rela *rel,
1371 struct elf_link_hash_entry *h,
1372 Elf_Internal_Sym *sym)
1373 {
1374 if (h != NULL)
1375 switch (ELF64_R_TYPE (rel->r_info))
1376 {
1377 case R_390_GNU_VTINHERIT:
1378 case R_390_GNU_VTENTRY:
1379 return NULL;
1380 }
1381
1382 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1383 }
1384
1385 /* Update the got entry reference counts for the section being removed. */
1386
1387 static bfd_boolean
1388 elf_s390_gc_sweep_hook (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 if (info->relocatable)
1399 return TRUE;
1400
1401 elf_section_data (sec)->local_dynrel = NULL;
1402
1403 symtab_hdr = &elf_symtab_hdr (abfd);
1404 sym_hashes = elf_sym_hashes (abfd);
1405 local_got_refcounts = elf_local_got_refcounts (abfd);
1406
1407 relend = relocs + sec->reloc_count;
1408 for (rel = relocs; rel < relend; rel++)
1409 {
1410 unsigned long r_symndx;
1411 unsigned int r_type;
1412 struct elf_link_hash_entry *h = NULL;
1413
1414 r_symndx = ELF64_R_SYM (rel->r_info);
1415 if (r_symndx >= symtab_hdr->sh_info)
1416 {
1417 struct elf_s390_link_hash_entry *eh;
1418 struct elf_s390_dyn_relocs **pp;
1419 struct elf_s390_dyn_relocs *p;
1420
1421 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1422 while (h->root.type == bfd_link_hash_indirect
1423 || h->root.type == bfd_link_hash_warning)
1424 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1425 eh = (struct elf_s390_link_hash_entry *) h;
1426
1427 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1428 if (p->sec == sec)
1429 {
1430 /* Everything must go for SEC. */
1431 *pp = p->next;
1432 break;
1433 }
1434 }
1435
1436 r_type = ELF64_R_TYPE (rel->r_info);
1437 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1438 switch (r_type)
1439 {
1440 case R_390_TLS_LDM64:
1441 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1442 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1443 break;
1444
1445 case R_390_TLS_GD64:
1446 case R_390_TLS_IE64:
1447 case R_390_TLS_GOTIE12:
1448 case R_390_TLS_GOTIE20:
1449 case R_390_TLS_GOTIE64:
1450 case R_390_TLS_IEENT:
1451 case R_390_GOT12:
1452 case R_390_GOT16:
1453 case R_390_GOT20:
1454 case R_390_GOT32:
1455 case R_390_GOT64:
1456 case R_390_GOTOFF16:
1457 case R_390_GOTOFF32:
1458 case R_390_GOTOFF64:
1459 case R_390_GOTPC:
1460 case R_390_GOTPCDBL:
1461 case R_390_GOTENT:
1462 if (h != NULL)
1463 {
1464 if (h->got.refcount > 0)
1465 h->got.refcount -= 1;
1466 }
1467 else if (local_got_refcounts != NULL)
1468 {
1469 if (local_got_refcounts[r_symndx] > 0)
1470 local_got_refcounts[r_symndx] -= 1;
1471 }
1472 break;
1473
1474 case R_390_8:
1475 case R_390_12:
1476 case R_390_16:
1477 case R_390_20:
1478 case R_390_32:
1479 case R_390_64:
1480 case R_390_PC16:
1481 case R_390_PC16DBL:
1482 case R_390_PC32:
1483 case R_390_PC32DBL:
1484 case R_390_PC64:
1485 if (info->shared)
1486 break;
1487 /* Fall through */
1488
1489 case R_390_PLT16DBL:
1490 case R_390_PLT32:
1491 case R_390_PLT32DBL:
1492 case R_390_PLT64:
1493 case R_390_PLTOFF16:
1494 case R_390_PLTOFF32:
1495 case R_390_PLTOFF64:
1496 if (h != NULL)
1497 {
1498 if (h->plt.refcount > 0)
1499 h->plt.refcount -= 1;
1500 }
1501 break;
1502
1503 case R_390_GOTPLT12:
1504 case R_390_GOTPLT16:
1505 case R_390_GOTPLT20:
1506 case R_390_GOTPLT32:
1507 case R_390_GOTPLT64:
1508 case R_390_GOTPLTENT:
1509 if (h != NULL)
1510 {
1511 if (h->plt.refcount > 0)
1512 {
1513 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1514 h->plt.refcount -= 1;
1515 }
1516 }
1517 else if (local_got_refcounts != NULL)
1518 {
1519 if (local_got_refcounts[r_symndx] > 0)
1520 local_got_refcounts[r_symndx] -= 1;
1521 }
1522 break;
1523
1524 default:
1525 break;
1526 }
1527 }
1528
1529 return TRUE;
1530 }
1531
1532 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1533 entry but we found we will not create any. Called when we find we will
1534 not have any PLT for this symbol, by for example
1535 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1536 or elf_s390_size_dynamic_sections if no dynamic sections will be
1537 created (we're only linking static objects). */
1538
1539 static void
1540 elf_s390_adjust_gotplt (h)
1541 struct elf_s390_link_hash_entry *h;
1542 {
1543 if (h->elf.root.type == bfd_link_hash_warning)
1544 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1545
1546 if (h->gotplt_refcount <= 0)
1547 return;
1548
1549 /* We simply add the number of gotplt references to the number
1550 * of got references for this symbol. */
1551 h->elf.got.refcount += h->gotplt_refcount;
1552 h->gotplt_refcount = -1;
1553 }
1554
1555 /* Adjust a symbol defined by a dynamic object and referenced by a
1556 regular object. The current definition is in some section of the
1557 dynamic object, but we're not including those sections. We have to
1558 change the definition to something the rest of the link can
1559 understand. */
1560
1561 static bfd_boolean
1562 elf_s390_adjust_dynamic_symbol (info, h)
1563 struct bfd_link_info *info;
1564 struct elf_link_hash_entry *h;
1565 {
1566 struct elf_s390_link_hash_table *htab;
1567 asection *s;
1568
1569 /* If this is a function, put it in the procedure linkage table. We
1570 will fill in the contents of the procedure linkage table later
1571 (although we could actually do it here). */
1572 if (h->type == STT_FUNC
1573 || h->needs_plt)
1574 {
1575 if (h->plt.refcount <= 0
1576 || (! info->shared
1577 && !h->def_dynamic
1578 && !h->ref_dynamic
1579 && h->root.type != bfd_link_hash_undefweak
1580 && h->root.type != bfd_link_hash_undefined))
1581 {
1582 /* This case can occur if we saw a PLT32 reloc in an input
1583 file, but the symbol was never referred to by a dynamic
1584 object, or if all references were garbage collected. In
1585 such a case, we don't actually need to build a procedure
1586 linkage table, and we can just do a PC32 reloc instead. */
1587 h->plt.offset = (bfd_vma) -1;
1588 h->needs_plt = 0;
1589 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1590 }
1591
1592 return TRUE;
1593 }
1594 else
1595 /* It's possible that we incorrectly decided a .plt reloc was
1596 needed for an R_390_PC32 reloc to a non-function sym in
1597 check_relocs. We can't decide accurately between function and
1598 non-function syms in check-relocs; Objects loaded later in
1599 the link may change h->type. So fix it now. */
1600 h->plt.offset = (bfd_vma) -1;
1601
1602 /* If this is a weak symbol, and there is a real definition, the
1603 processor independent code will have arranged for us to see the
1604 real definition first, and we can just use the same value. */
1605 if (h->u.weakdef != NULL)
1606 {
1607 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1608 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1609 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1610 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1611 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1612 h->non_got_ref = h->u.weakdef->non_got_ref;
1613 return TRUE;
1614 }
1615
1616 /* This is a reference to a symbol defined by a dynamic object which
1617 is not a function. */
1618
1619 /* If we are creating a shared library, we must presume that the
1620 only references to the symbol are via the global offset table.
1621 For such cases we need not do anything here; the relocations will
1622 be handled correctly by relocate_section. */
1623 if (info->shared)
1624 return TRUE;
1625
1626 /* If there are no references to this symbol that do not use the
1627 GOT, we don't need to generate a copy reloc. */
1628 if (!h->non_got_ref)
1629 return TRUE;
1630
1631 /* If -z nocopyreloc was given, we won't generate them either. */
1632 if (info->nocopyreloc)
1633 {
1634 h->non_got_ref = 0;
1635 return TRUE;
1636 }
1637
1638 if (ELIMINATE_COPY_RELOCS)
1639 {
1640 struct elf_s390_link_hash_entry * eh;
1641 struct elf_s390_dyn_relocs *p;
1642
1643 eh = (struct elf_s390_link_hash_entry *) h;
1644 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1645 {
1646 s = p->sec->output_section;
1647 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1648 break;
1649 }
1650
1651 /* If we didn't find any dynamic relocs in read-only sections, then
1652 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1653 if (p == NULL)
1654 {
1655 h->non_got_ref = 0;
1656 return TRUE;
1657 }
1658 }
1659
1660 if (h->size == 0)
1661 {
1662 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1663 h->root.root.string);
1664 return TRUE;
1665 }
1666
1667 /* We must allocate the symbol in our .dynbss section, which will
1668 become part of the .bss section of the executable. There will be
1669 an entry for this symbol in the .dynsym section. The dynamic
1670 object will contain position independent code, so all references
1671 from the dynamic object to this symbol will go through the global
1672 offset table. The dynamic linker will use the .dynsym entry to
1673 determine the address it must put in the global offset table, so
1674 both the dynamic object and the regular object will refer to the
1675 same memory location for the variable. */
1676
1677 htab = elf_s390_hash_table (info);
1678
1679 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1680 copy the initial value out of the dynamic object and into the
1681 runtime process image. */
1682 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1683 {
1684 htab->srelbss->size += sizeof (Elf64_External_Rela);
1685 h->needs_copy = 1;
1686 }
1687
1688 s = htab->sdynbss;
1689
1690 return _bfd_elf_adjust_dynamic_copy (h, s);
1691 }
1692
1693 /* Allocate space in .plt, .got and associated reloc sections for
1694 dynamic relocs. */
1695
1696 static bfd_boolean
1697 allocate_dynrelocs (h, inf)
1698 struct elf_link_hash_entry *h;
1699 PTR inf;
1700 {
1701 struct bfd_link_info *info;
1702 struct elf_s390_link_hash_table *htab;
1703 struct elf_s390_link_hash_entry *eh;
1704 struct elf_s390_dyn_relocs *p;
1705
1706 if (h->root.type == bfd_link_hash_indirect)
1707 return TRUE;
1708
1709 if (h->root.type == bfd_link_hash_warning)
1710 /* When warning symbols are created, they **replace** the "real"
1711 entry in the hash table, thus we never get to see the real
1712 symbol in a hash traversal. So look at it now. */
1713 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1714
1715 info = (struct bfd_link_info *) inf;
1716 htab = elf_s390_hash_table (info);
1717
1718 if (htab->elf.dynamic_sections_created
1719 && h->plt.refcount > 0
1720 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1721 || h->root.type != bfd_link_hash_undefweak))
1722 {
1723 /* Make sure this symbol is output as a dynamic symbol.
1724 Undefined weak syms won't yet be marked as dynamic. */
1725 if (h->dynindx == -1
1726 && !h->forced_local)
1727 {
1728 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1729 return FALSE;
1730 }
1731
1732 if (info->shared
1733 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1734 {
1735 asection *s = htab->splt;
1736
1737 /* If this is the first .plt entry, make room for the special
1738 first entry. */
1739 if (s->size == 0)
1740 s->size += PLT_FIRST_ENTRY_SIZE;
1741
1742 h->plt.offset = s->size;
1743
1744 /* If this symbol is not defined in a regular file, and we are
1745 not generating a shared library, then set the symbol to this
1746 location in the .plt. This is required to make function
1747 pointers compare as equal between the normal executable and
1748 the shared library. */
1749 if (! info->shared
1750 && !h->def_regular)
1751 {
1752 h->root.u.def.section = s;
1753 h->root.u.def.value = h->plt.offset;
1754 }
1755
1756 /* Make room for this entry. */
1757 s->size += PLT_ENTRY_SIZE;
1758
1759 /* We also need to make an entry in the .got.plt section, which
1760 will be placed in the .got section by the linker script. */
1761 htab->sgotplt->size += GOT_ENTRY_SIZE;
1762
1763 /* We also need to make an entry in the .rela.plt section. */
1764 htab->srelplt->size += sizeof (Elf64_External_Rela);
1765 }
1766 else
1767 {
1768 h->plt.offset = (bfd_vma) -1;
1769 h->needs_plt = 0;
1770 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1771 }
1772 }
1773 else
1774 {
1775 h->plt.offset = (bfd_vma) -1;
1776 h->needs_plt = 0;
1777 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1778 }
1779
1780 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to
1781 the binary, we can optimize a bit. IE64 and GOTIE64 get converted
1782 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT
1783 we can save the dynamic TLS relocation. */
1784 if (h->got.refcount > 0
1785 && !info->shared
1786 && h->dynindx == -1
1787 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1788 {
1789 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1790 /* For the GOTIE access without a literal pool entry the offset has
1791 to be stored somewhere. The immediate value in the instruction
1792 is not bit enough so the value is stored in the got. */
1793 {
1794 h->got.offset = htab->sgot->size;
1795 htab->sgot->size += GOT_ENTRY_SIZE;
1796 }
1797 else
1798 h->got.offset = (bfd_vma) -1;
1799 }
1800 else if (h->got.refcount > 0)
1801 {
1802 asection *s;
1803 bfd_boolean dyn;
1804 int tls_type = elf_s390_hash_entry(h)->tls_type;
1805
1806 /* Make sure this symbol is output as a dynamic symbol.
1807 Undefined weak syms won't yet be marked as dynamic. */
1808 if (h->dynindx == -1
1809 && !h->forced_local)
1810 {
1811 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1812 return FALSE;
1813 }
1814
1815 s = htab->sgot;
1816 h->got.offset = s->size;
1817 s->size += GOT_ENTRY_SIZE;
1818 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */
1819 if (tls_type == GOT_TLS_GD)
1820 s->size += GOT_ENTRY_SIZE;
1821 dyn = htab->elf.dynamic_sections_created;
1822 /* R_390_TLS_IE64 needs one dynamic relocation,
1823 R_390_TLS_GD64 needs one if local symbol and two if global. */
1824 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1825 || tls_type >= GOT_TLS_IE)
1826 htab->srelgot->size += sizeof (Elf64_External_Rela);
1827 else if (tls_type == GOT_TLS_GD)
1828 htab->srelgot->size += 2 * sizeof (Elf64_External_Rela);
1829 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1830 || h->root.type != bfd_link_hash_undefweak)
1831 && (info->shared
1832 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1833 htab->srelgot->size += sizeof (Elf64_External_Rela);
1834 }
1835 else
1836 h->got.offset = (bfd_vma) -1;
1837
1838 eh = (struct elf_s390_link_hash_entry *) h;
1839 if (eh->dyn_relocs == NULL)
1840 return TRUE;
1841
1842 /* In the shared -Bsymbolic case, discard space allocated for
1843 dynamic pc-relative relocs against symbols which turn out to be
1844 defined in regular objects. For the normal shared case, discard
1845 space for pc-relative relocs that have become local due to symbol
1846 visibility changes. */
1847
1848 if (info->shared)
1849 {
1850 if (SYMBOL_REFERENCES_LOCAL (info, h))
1851 {
1852 struct elf_s390_dyn_relocs **pp;
1853
1854 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1855 {
1856 p->count -= p->pc_count;
1857 p->pc_count = 0;
1858 if (p->count == 0)
1859 *pp = p->next;
1860 else
1861 pp = &p->next;
1862 }
1863 }
1864
1865 /* Also discard relocs on undefined weak syms with non-default
1866 visibility. */
1867 if (eh->dyn_relocs != NULL
1868 && h->root.type == bfd_link_hash_undefweak)
1869 {
1870 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1871 eh->dyn_relocs = NULL;
1872
1873 /* Make sure undefined weak symbols are output as a dynamic
1874 symbol in PIEs. */
1875 else if (h->dynindx == -1
1876 && !h->forced_local)
1877 {
1878 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1879 return FALSE;
1880 }
1881 }
1882 }
1883 else if (ELIMINATE_COPY_RELOCS)
1884 {
1885 /* For the non-shared case, discard space for relocs against
1886 symbols which turn out to need copy relocs or are not
1887 dynamic. */
1888
1889 if (!h->non_got_ref
1890 && ((h->def_dynamic
1891 && !h->def_regular)
1892 || (htab->elf.dynamic_sections_created
1893 && (h->root.type == bfd_link_hash_undefweak
1894 || h->root.type == bfd_link_hash_undefined))))
1895 {
1896 /* Make sure this symbol is output as a dynamic symbol.
1897 Undefined weak syms won't yet be marked as dynamic. */
1898 if (h->dynindx == -1
1899 && !h->forced_local)
1900 {
1901 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1902 return FALSE;
1903 }
1904
1905 /* If that succeeded, we know we'll be keeping all the
1906 relocs. */
1907 if (h->dynindx != -1)
1908 goto keep;
1909 }
1910
1911 eh->dyn_relocs = NULL;
1912
1913 keep: ;
1914 }
1915
1916 /* Finally, allocate space. */
1917 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1918 {
1919 asection *sreloc = elf_section_data (p->sec)->sreloc;
1920 sreloc->size += p->count * sizeof (Elf64_External_Rela);
1921 }
1922
1923 return TRUE;
1924 }
1925
1926 /* Find any dynamic relocs that apply to read-only sections. */
1927
1928 static bfd_boolean
1929 readonly_dynrelocs (h, inf)
1930 struct elf_link_hash_entry *h;
1931 PTR inf;
1932 {
1933 struct elf_s390_link_hash_entry *eh;
1934 struct elf_s390_dyn_relocs *p;
1935
1936 if (h->root.type == bfd_link_hash_warning)
1937 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1938
1939 eh = (struct elf_s390_link_hash_entry *) h;
1940 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1941 {
1942 asection *s = p->sec->output_section;
1943
1944 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1945 {
1946 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1947
1948 info->flags |= DF_TEXTREL;
1949
1950 /* Not an error, just cut short the traversal. */
1951 return FALSE;
1952 }
1953 }
1954 return TRUE;
1955 }
1956
1957 /* Set the sizes of the dynamic sections. */
1958
1959 static bfd_boolean
1960 elf_s390_size_dynamic_sections (output_bfd, info)
1961 bfd *output_bfd ATTRIBUTE_UNUSED;
1962 struct bfd_link_info *info;
1963 {
1964 struct elf_s390_link_hash_table *htab;
1965 bfd *dynobj;
1966 asection *s;
1967 bfd_boolean relocs;
1968 bfd *ibfd;
1969
1970 htab = elf_s390_hash_table (info);
1971 dynobj = htab->elf.dynobj;
1972 if (dynobj == NULL)
1973 abort ();
1974
1975 if (htab->elf.dynamic_sections_created)
1976 {
1977 /* Set the contents of the .interp section to the interpreter. */
1978 if (info->executable)
1979 {
1980 s = bfd_get_section_by_name (dynobj, ".interp");
1981 if (s == NULL)
1982 abort ();
1983 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1984 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1985 }
1986 }
1987
1988 /* Set up .got offsets for local syms, and space for local dynamic
1989 relocs. */
1990 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1991 {
1992 bfd_signed_vma *local_got;
1993 bfd_signed_vma *end_local_got;
1994 char *local_tls_type;
1995 bfd_size_type locsymcount;
1996 Elf_Internal_Shdr *symtab_hdr;
1997 asection *srela;
1998
1999 if (! is_s390_elf (ibfd))
2000 continue;
2001
2002 for (s = ibfd->sections; s != NULL; s = s->next)
2003 {
2004 struct elf_s390_dyn_relocs *p;
2005
2006 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
2007 {
2008 if (!bfd_is_abs_section (p->sec)
2009 && bfd_is_abs_section (p->sec->output_section))
2010 {
2011 /* Input section has been discarded, either because
2012 it is a copy of a linkonce section or due to
2013 linker script /DISCARD/, so we'll be discarding
2014 the relocs too. */
2015 }
2016 else if (p->count != 0)
2017 {
2018 srela = elf_section_data (p->sec)->sreloc;
2019 srela->size += p->count * sizeof (Elf64_External_Rela);
2020 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2021 info->flags |= DF_TEXTREL;
2022 }
2023 }
2024 }
2025
2026 local_got = elf_local_got_refcounts (ibfd);
2027 if (!local_got)
2028 continue;
2029
2030 symtab_hdr = &elf_symtab_hdr (ibfd);
2031 locsymcount = symtab_hdr->sh_info;
2032 end_local_got = local_got + locsymcount;
2033 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2034 s = htab->sgot;
2035 srela = htab->srelgot;
2036 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2037 {
2038 if (*local_got > 0)
2039 {
2040 *local_got = s->size;
2041 s->size += GOT_ENTRY_SIZE;
2042 if (*local_tls_type == GOT_TLS_GD)
2043 s->size += GOT_ENTRY_SIZE;
2044 if (info->shared)
2045 srela->size += sizeof (Elf64_External_Rela);
2046 }
2047 else
2048 *local_got = (bfd_vma) -1;
2049 }
2050 }
2051
2052 if (htab->tls_ldm_got.refcount > 0)
2053 {
2054 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64
2055 relocs. */
2056 htab->tls_ldm_got.offset = htab->sgot->size;
2057 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2058 htab->srelgot->size += sizeof (Elf64_External_Rela);
2059 }
2060 else
2061 htab->tls_ldm_got.offset = -1;
2062
2063 /* Allocate global sym .plt and .got entries, and space for global
2064 sym dynamic relocs. */
2065 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2066
2067 /* We now have determined the sizes of the various dynamic sections.
2068 Allocate memory for them. */
2069 relocs = FALSE;
2070 for (s = dynobj->sections; s != NULL; s = s->next)
2071 {
2072 if ((s->flags & SEC_LINKER_CREATED) == 0)
2073 continue;
2074
2075 if (s == htab->splt
2076 || s == htab->sgot
2077 || s == htab->sgotplt
2078 || s == htab->sdynbss)
2079 {
2080 /* Strip this section if we don't need it; see the
2081 comment below. */
2082 }
2083 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2084 {
2085 if (s->size != 0 && s != htab->srelplt)
2086 relocs = TRUE;
2087
2088 /* We use the reloc_count field as a counter if we need
2089 to copy relocs into the output file. */
2090 s->reloc_count = 0;
2091 }
2092 else
2093 {
2094 /* It's not one of our sections, so don't allocate space. */
2095 continue;
2096 }
2097
2098 if (s->size == 0)
2099 {
2100 /* If we don't need this section, strip it from the
2101 output file. This is to handle .rela.bss and
2102 .rela.plt. We must create it in
2103 create_dynamic_sections, because it must be created
2104 before the linker maps input sections to output
2105 sections. The linker does that before
2106 adjust_dynamic_symbol is called, and it is that
2107 function which decides whether anything needs to go
2108 into these sections. */
2109
2110 s->flags |= SEC_EXCLUDE;
2111 continue;
2112 }
2113
2114 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2115 continue;
2116
2117 /* Allocate memory for the section contents. We use bfd_zalloc
2118 here in case unused entries are not reclaimed before the
2119 section's contents are written out. This should not happen,
2120 but this way if it does, we get a R_390_NONE reloc instead
2121 of garbage. */
2122 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2123 if (s->contents == NULL)
2124 return FALSE;
2125 }
2126
2127 if (htab->elf.dynamic_sections_created)
2128 {
2129 /* Add some entries to the .dynamic section. We fill in the
2130 values later, in elf_s390_finish_dynamic_sections, but we
2131 must add the entries now so that we get the correct size for
2132 the .dynamic section. The DT_DEBUG entry is filled in by the
2133 dynamic linker and used by the debugger. */
2134 #define add_dynamic_entry(TAG, VAL) \
2135 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2136
2137 if (info->executable)
2138 {
2139 if (!add_dynamic_entry (DT_DEBUG, 0))
2140 return FALSE;
2141 }
2142
2143 if (htab->splt->size != 0)
2144 {
2145 if (!add_dynamic_entry (DT_PLTGOT, 0)
2146 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2147 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2148 || !add_dynamic_entry (DT_JMPREL, 0))
2149 return FALSE;
2150 }
2151
2152 if (relocs)
2153 {
2154 if (!add_dynamic_entry (DT_RELA, 0)
2155 || !add_dynamic_entry (DT_RELASZ, 0)
2156 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2157 return FALSE;
2158
2159 /* If any dynamic relocs apply to a read-only section,
2160 then we need a DT_TEXTREL entry. */
2161 if ((info->flags & DF_TEXTREL) == 0)
2162 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2163 (PTR) info);
2164
2165 if ((info->flags & DF_TEXTREL) != 0)
2166 {
2167 if (!add_dynamic_entry (DT_TEXTREL, 0))
2168 return FALSE;
2169 }
2170 }
2171 }
2172 #undef add_dynamic_entry
2173
2174 return TRUE;
2175 }
2176
2177 /* Return the base VMA address which should be subtracted from real addresses
2178 when resolving @dtpoff relocation.
2179 This is PT_TLS segment p_vaddr. */
2180
2181 static bfd_vma
2182 dtpoff_base (info)
2183 struct bfd_link_info *info;
2184 {
2185 /* If tls_sec is NULL, we should have signalled an error already. */
2186 if (elf_hash_table (info)->tls_sec == NULL)
2187 return 0;
2188 return elf_hash_table (info)->tls_sec->vma;
2189 }
2190
2191 /* Return the relocation value for @tpoff relocation
2192 if STT_TLS virtual address is ADDRESS. */
2193
2194 static bfd_vma
2195 tpoff (info, address)
2196 struct bfd_link_info *info;
2197 bfd_vma address;
2198 {
2199 struct elf_link_hash_table *htab = elf_hash_table (info);
2200
2201 /* If tls_sec is NULL, we should have signalled an error already. */
2202 if (htab->tls_sec == NULL)
2203 return 0;
2204 return htab->tls_size + htab->tls_sec->vma - address;
2205 }
2206
2207 /* Complain if TLS instruction relocation is against an invalid
2208 instruction. */
2209
2210 static void
2211 invalid_tls_insn (input_bfd, input_section, rel)
2212 bfd *input_bfd;
2213 asection *input_section;
2214 Elf_Internal_Rela *rel;
2215 {
2216 reloc_howto_type *howto;
2217
2218 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
2219 (*_bfd_error_handler)
2220 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2221 input_bfd,
2222 input_section,
2223 (long) rel->r_offset,
2224 howto->name);
2225 bfd_set_error (bfd_error_bad_value);
2226 }
2227
2228 /* Relocate a 390 ELF section. */
2229
2230 static bfd_boolean
2231 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2232 contents, relocs, local_syms, local_sections)
2233 bfd *output_bfd;
2234 struct bfd_link_info *info;
2235 bfd *input_bfd;
2236 asection *input_section;
2237 bfd_byte *contents;
2238 Elf_Internal_Rela *relocs;
2239 Elf_Internal_Sym *local_syms;
2240 asection **local_sections;
2241 {
2242 struct elf_s390_link_hash_table *htab;
2243 Elf_Internal_Shdr *symtab_hdr;
2244 struct elf_link_hash_entry **sym_hashes;
2245 bfd_vma *local_got_offsets;
2246 Elf_Internal_Rela *rel;
2247 Elf_Internal_Rela *relend;
2248
2249 BFD_ASSERT (is_s390_elf (input_bfd));
2250
2251 htab = elf_s390_hash_table (info);
2252 symtab_hdr = &elf_symtab_hdr (input_bfd);
2253 sym_hashes = elf_sym_hashes (input_bfd);
2254 local_got_offsets = elf_local_got_offsets (input_bfd);
2255
2256 rel = relocs;
2257 relend = relocs + input_section->reloc_count;
2258 for (; rel < relend; rel++)
2259 {
2260 unsigned int r_type;
2261 reloc_howto_type *howto;
2262 unsigned long r_symndx;
2263 struct elf_link_hash_entry *h;
2264 Elf_Internal_Sym *sym;
2265 asection *sec;
2266 bfd_vma off;
2267 bfd_vma relocation;
2268 bfd_boolean unresolved_reloc;
2269 bfd_reloc_status_type r;
2270 int tls_type;
2271
2272 r_type = ELF64_R_TYPE (rel->r_info);
2273 if (r_type == (int) R_390_GNU_VTINHERIT
2274 || r_type == (int) R_390_GNU_VTENTRY)
2275 continue;
2276 if (r_type >= (int) R_390_max)
2277 {
2278 bfd_set_error (bfd_error_bad_value);
2279 return FALSE;
2280 }
2281
2282 howto = elf_howto_table + r_type;
2283 r_symndx = ELF64_R_SYM (rel->r_info);
2284
2285 h = NULL;
2286 sym = NULL;
2287 sec = NULL;
2288 unresolved_reloc = FALSE;
2289 if (r_symndx < symtab_hdr->sh_info)
2290 {
2291 sym = local_syms + r_symndx;
2292 sec = local_sections[r_symndx];
2293 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2294 }
2295 else
2296 {
2297 bfd_boolean warned ATTRIBUTE_UNUSED;
2298
2299 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2300 r_symndx, symtab_hdr, sym_hashes,
2301 h, sec, relocation,
2302 unresolved_reloc, warned);
2303 }
2304
2305 if (sec != NULL && elf_discarded_section (sec))
2306 {
2307 /* For relocs against symbols from removed linkonce sections,
2308 or sections discarded by a linker script, we just want the
2309 section contents zeroed. Avoid any special processing. */
2310 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2311 rel->r_info = 0;
2312 rel->r_addend = 0;
2313 continue;
2314 }
2315
2316 if (info->relocatable)
2317 continue;
2318
2319 switch (r_type)
2320 {
2321 case R_390_GOTPLT12:
2322 case R_390_GOTPLT16:
2323 case R_390_GOTPLT20:
2324 case R_390_GOTPLT32:
2325 case R_390_GOTPLT64:
2326 case R_390_GOTPLTENT:
2327 /* There are three cases for a GOTPLT relocation. 1) The
2328 relocation is against the jump slot entry of a plt that
2329 will get emitted to the output file. 2) The relocation
2330 is against the jump slot of a plt entry that has been
2331 removed. elf_s390_adjust_gotplt has created a GOT entry
2332 as replacement. 3) The relocation is against a local symbol.
2333 Cases 2) and 3) are the same as the GOT relocation code
2334 so we just have to test for case 1 and fall through for
2335 the other two. */
2336 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2337 {
2338 bfd_vma plt_index;
2339
2340 /* Calc. index no.
2341 Current offset - size first entry / entry size. */
2342 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2343 PLT_ENTRY_SIZE;
2344
2345 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2346 addr & GOT addr. */
2347 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2348 unresolved_reloc = FALSE;
2349
2350 if (r_type == R_390_GOTPLTENT)
2351 relocation += htab->sgot->output_section->vma;
2352 break;
2353 }
2354 /* Fall through. */
2355
2356 case R_390_GOT12:
2357 case R_390_GOT16:
2358 case R_390_GOT20:
2359 case R_390_GOT32:
2360 case R_390_GOT64:
2361 case R_390_GOTENT:
2362 /* Relocation is to the entry for this symbol in the global
2363 offset table. */
2364 if (htab->sgot == NULL)
2365 abort ();
2366
2367 if (h != NULL)
2368 {
2369 bfd_boolean dyn;
2370
2371 off = h->got.offset;
2372 dyn = htab->elf.dynamic_sections_created;
2373 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2374 || (info->shared
2375 && (info->symbolic
2376 || h->dynindx == -1
2377 || h->forced_local)
2378 && h->def_regular)
2379 || (ELF_ST_VISIBILITY (h->other)
2380 && h->root.type == bfd_link_hash_undefweak))
2381 {
2382 /* This is actually a static link, or it is a
2383 -Bsymbolic link and the symbol is defined
2384 locally, or the symbol was forced to be local
2385 because of a version file. We must initialize
2386 this entry in the global offset table. Since the
2387 offset must always be a multiple of 2, we use the
2388 least significant bit to record whether we have
2389 initialized it already.
2390
2391 When doing a dynamic link, we create a .rel.got
2392 relocation entry to initialize the value. This
2393 is done in the finish_dynamic_symbol routine. */
2394 if ((off & 1) != 0)
2395 off &= ~1;
2396 else
2397 {
2398 bfd_put_64 (output_bfd, relocation,
2399 htab->sgot->contents + off);
2400 h->got.offset |= 1;
2401 }
2402 }
2403 else
2404 unresolved_reloc = FALSE;
2405 }
2406 else
2407 {
2408 if (local_got_offsets == NULL)
2409 abort ();
2410
2411 off = local_got_offsets[r_symndx];
2412
2413 /* The offset must always be a multiple of 8. We use
2414 the least significant bit to record whether we have
2415 already generated the necessary reloc. */
2416 if ((off & 1) != 0)
2417 off &= ~1;
2418 else
2419 {
2420 bfd_put_64 (output_bfd, relocation,
2421 htab->sgot->contents + off);
2422
2423 if (info->shared)
2424 {
2425 asection *s;
2426 Elf_Internal_Rela outrel;
2427 bfd_byte *loc;
2428
2429 s = htab->srelgot;
2430 if (s == NULL)
2431 abort ();
2432
2433 outrel.r_offset = (htab->sgot->output_section->vma
2434 + htab->sgot->output_offset
2435 + off);
2436 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2437 outrel.r_addend = relocation;
2438 loc = s->contents;
2439 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2440 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2441 }
2442
2443 local_got_offsets[r_symndx] |= 1;
2444 }
2445 }
2446
2447 if (off >= (bfd_vma) -2)
2448 abort ();
2449
2450 relocation = htab->sgot->output_offset + off;
2451
2452 /* For @GOTENT the relocation is against the offset between
2453 the instruction and the symbols entry in the GOT and not
2454 between the start of the GOT and the symbols entry. We
2455 add the vma of the GOT to get the correct value. */
2456 if ( r_type == R_390_GOTENT
2457 || r_type == R_390_GOTPLTENT)
2458 relocation += htab->sgot->output_section->vma;
2459
2460 break;
2461
2462 case R_390_GOTOFF16:
2463 case R_390_GOTOFF32:
2464 case R_390_GOTOFF64:
2465 /* Relocation is relative to the start of the global offset
2466 table. */
2467
2468 /* Note that sgot->output_offset is not involved in this
2469 calculation. We always want the start of .got. If we
2470 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2471 permitted by the ABI, we might have to change this
2472 calculation. */
2473 relocation -= htab->sgot->output_section->vma;
2474 break;
2475
2476 case R_390_GOTPC:
2477 case R_390_GOTPCDBL:
2478 /* Use global offset table as symbol value. */
2479 relocation = htab->sgot->output_section->vma;
2480 unresolved_reloc = FALSE;
2481 break;
2482
2483 case R_390_PLT16DBL:
2484 case R_390_PLT32:
2485 case R_390_PLT32DBL:
2486 case R_390_PLT64:
2487 /* Relocation is to the entry for this symbol in the
2488 procedure linkage table. */
2489
2490 /* Resolve a PLT32 reloc against a local symbol directly,
2491 without using the procedure linkage table. */
2492 if (h == NULL)
2493 break;
2494
2495 if (h->plt.offset == (bfd_vma) -1
2496 || htab->splt == NULL)
2497 {
2498 /* We didn't make a PLT entry for this symbol. This
2499 happens when statically linking PIC code, or when
2500 using -Bsymbolic. */
2501 break;
2502 }
2503
2504 relocation = (htab->splt->output_section->vma
2505 + htab->splt->output_offset
2506 + h->plt.offset);
2507 unresolved_reloc = FALSE;
2508 break;
2509
2510 case R_390_PLTOFF16:
2511 case R_390_PLTOFF32:
2512 case R_390_PLTOFF64:
2513 /* Relocation is to the entry for this symbol in the
2514 procedure linkage table relative to the start of the GOT. */
2515
2516 /* For local symbols or if we didn't make a PLT entry for
2517 this symbol resolve the symbol directly. */
2518 if ( h == NULL
2519 || h->plt.offset == (bfd_vma) -1
2520 || htab->splt == NULL)
2521 {
2522 relocation -= htab->sgot->output_section->vma;
2523 break;
2524 }
2525
2526 relocation = (htab->splt->output_section->vma
2527 + htab->splt->output_offset
2528 + h->plt.offset
2529 - htab->sgot->output_section->vma);
2530 unresolved_reloc = FALSE;
2531 break;
2532
2533 case R_390_8:
2534 case R_390_16:
2535 case R_390_32:
2536 case R_390_64:
2537 case R_390_PC16:
2538 case R_390_PC16DBL:
2539 case R_390_PC32:
2540 case R_390_PC32DBL:
2541 case R_390_PC64:
2542 if ((input_section->flags & SEC_ALLOC) == 0)
2543 break;
2544
2545 if ((info->shared
2546 && (h == NULL
2547 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2548 || h->root.type != bfd_link_hash_undefweak)
2549 && ((r_type != R_390_PC16
2550 && r_type != R_390_PC16DBL
2551 && r_type != R_390_PC32
2552 && r_type != R_390_PC32DBL
2553 && r_type != R_390_PC64)
2554 || (h != NULL
2555 && !SYMBOL_REFERENCES_LOCAL (info, h))))
2556 || (ELIMINATE_COPY_RELOCS
2557 && !info->shared
2558 && h != NULL
2559 && h->dynindx != -1
2560 && !h->non_got_ref
2561 && ((h->def_dynamic
2562 && !h->def_regular)
2563 || h->root.type == bfd_link_hash_undefweak
2564 || h->root.type == bfd_link_hash_undefined)))
2565 {
2566 Elf_Internal_Rela outrel;
2567 bfd_boolean skip, relocate;
2568 asection *sreloc;
2569 bfd_byte *loc;
2570
2571 /* When generating a shared object, these relocations
2572 are copied into the output file to be resolved at run
2573 time. */
2574 skip = FALSE;
2575 relocate = FALSE;
2576
2577 outrel.r_offset =
2578 _bfd_elf_section_offset (output_bfd, info, input_section,
2579 rel->r_offset);
2580 if (outrel.r_offset == (bfd_vma) -1)
2581 skip = TRUE;
2582 else if (outrel.r_offset == (bfd_vma) -2)
2583 skip = TRUE, relocate = TRUE;
2584
2585 outrel.r_offset += (input_section->output_section->vma
2586 + input_section->output_offset);
2587
2588 if (skip)
2589 memset (&outrel, 0, sizeof outrel);
2590 else if (h != NULL
2591 && h->dynindx != -1
2592 && (r_type == R_390_PC16
2593 || r_type == R_390_PC16DBL
2594 || r_type == R_390_PC32
2595 || r_type == R_390_PC32DBL
2596 || r_type == R_390_PC64
2597 || !info->shared
2598 || !info->symbolic
2599 || !h->def_regular))
2600 {
2601 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2602 outrel.r_addend = rel->r_addend;
2603 }
2604 else
2605 {
2606 /* This symbol is local, or marked to become local. */
2607 outrel.r_addend = relocation + rel->r_addend;
2608 if (r_type == R_390_64)
2609 {
2610 relocate = TRUE;
2611 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2612 }
2613 else
2614 {
2615 long sindx;
2616
2617 if (bfd_is_abs_section (sec))
2618 sindx = 0;
2619 else if (sec == NULL || sec->owner == NULL)
2620 {
2621 bfd_set_error(bfd_error_bad_value);
2622 return FALSE;
2623 }
2624 else
2625 {
2626 asection *osec;
2627
2628 osec = sec->output_section;
2629 sindx = elf_section_data (osec)->dynindx;
2630
2631 if (sindx == 0)
2632 {
2633 osec = htab->elf.text_index_section;
2634 sindx = elf_section_data (osec)->dynindx;
2635 }
2636 BFD_ASSERT (sindx != 0);
2637
2638 /* We are turning this relocation into one
2639 against a section symbol, so subtract out
2640 the output section's address but not the
2641 offset of the input section in the output
2642 section. */
2643 outrel.r_addend -= osec->vma;
2644 }
2645 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2646 }
2647 }
2648
2649 sreloc = elf_section_data (input_section)->sreloc;
2650 if (sreloc == NULL)
2651 abort ();
2652
2653 loc = sreloc->contents;
2654 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2655 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2656
2657 /* If this reloc is against an external symbol, we do
2658 not want to fiddle with the addend. Otherwise, we
2659 need to include the symbol value so that it becomes
2660 an addend for the dynamic reloc. */
2661 if (! relocate)
2662 continue;
2663 }
2664
2665 break;
2666
2667 /* Relocations for tls literal pool entries. */
2668 case R_390_TLS_IE64:
2669 if (info->shared)
2670 {
2671 Elf_Internal_Rela outrel;
2672 asection *sreloc;
2673 bfd_byte *loc;
2674
2675 outrel.r_offset = rel->r_offset
2676 + input_section->output_section->vma
2677 + input_section->output_offset;
2678 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2679 sreloc = elf_section_data (input_section)->sreloc;
2680 if (sreloc == NULL)
2681 abort ();
2682 loc = sreloc->contents;
2683 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2684 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2685 }
2686 /* Fall through. */
2687
2688 case R_390_TLS_GD64:
2689 case R_390_TLS_GOTIE64:
2690 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2691 tls_type = GOT_UNKNOWN;
2692 if (h == NULL && local_got_offsets)
2693 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2694 else if (h != NULL)
2695 {
2696 tls_type = elf_s390_hash_entry(h)->tls_type;
2697 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2698 r_type = R_390_TLS_LE64;
2699 }
2700 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2701 r_type = R_390_TLS_IE64;
2702
2703 if (r_type == R_390_TLS_LE64)
2704 {
2705 /* This relocation gets optimized away by the local exec
2706 access optimization. */
2707 BFD_ASSERT (! unresolved_reloc);
2708 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2709 contents + rel->r_offset);
2710 continue;
2711 }
2712
2713 if (htab->sgot == NULL)
2714 abort ();
2715
2716 if (h != NULL)
2717 off = h->got.offset;
2718 else
2719 {
2720 if (local_got_offsets == NULL)
2721 abort ();
2722
2723 off = local_got_offsets[r_symndx];
2724 }
2725
2726 emit_tls_relocs:
2727
2728 if ((off & 1) != 0)
2729 off &= ~1;
2730 else
2731 {
2732 Elf_Internal_Rela outrel;
2733 bfd_byte *loc;
2734 int dr_type, indx;
2735
2736 if (htab->srelgot == NULL)
2737 abort ();
2738
2739 outrel.r_offset = (htab->sgot->output_section->vma
2740 + htab->sgot->output_offset + off);
2741
2742 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2743 if (r_type == R_390_TLS_GD64)
2744 dr_type = R_390_TLS_DTPMOD;
2745 else
2746 dr_type = R_390_TLS_TPOFF;
2747 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2748 outrel.r_addend = relocation - dtpoff_base (info);
2749 else
2750 outrel.r_addend = 0;
2751 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2752 loc = htab->srelgot->contents;
2753 loc += htab->srelgot->reloc_count++
2754 * sizeof (Elf64_External_Rela);
2755 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2756
2757 if (r_type == R_390_TLS_GD64)
2758 {
2759 if (indx == 0)
2760 {
2761 BFD_ASSERT (! unresolved_reloc);
2762 bfd_put_64 (output_bfd,
2763 relocation - dtpoff_base (info),
2764 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2765 }
2766 else
2767 {
2768 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
2769 outrel.r_offset += GOT_ENTRY_SIZE;
2770 outrel.r_addend = 0;
2771 htab->srelgot->reloc_count++;
2772 loc += sizeof (Elf64_External_Rela);
2773 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2774 }
2775 }
2776
2777 if (h != NULL)
2778 h->got.offset |= 1;
2779 else
2780 local_got_offsets[r_symndx] |= 1;
2781 }
2782
2783 if (off >= (bfd_vma) -2)
2784 abort ();
2785 if (r_type == ELF64_R_TYPE (rel->r_info))
2786 {
2787 relocation = htab->sgot->output_offset + off;
2788 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
2789 relocation += htab->sgot->output_section->vma;
2790 unresolved_reloc = FALSE;
2791 }
2792 else
2793 {
2794 bfd_put_64 (output_bfd, htab->sgot->output_offset + off,
2795 contents + rel->r_offset);
2796 continue;
2797 }
2798 break;
2799
2800 case R_390_TLS_GOTIE12:
2801 case R_390_TLS_GOTIE20:
2802 case R_390_TLS_IEENT:
2803 if (h == NULL)
2804 {
2805 if (local_got_offsets == NULL)
2806 abort();
2807 off = local_got_offsets[r_symndx];
2808 if (info->shared)
2809 goto emit_tls_relocs;
2810 }
2811 else
2812 {
2813 off = h->got.offset;
2814 tls_type = elf_s390_hash_entry(h)->tls_type;
2815 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2816 goto emit_tls_relocs;
2817 }
2818
2819 if (htab->sgot == NULL)
2820 abort ();
2821
2822 BFD_ASSERT (! unresolved_reloc);
2823 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2824 htab->sgot->contents + off);
2825 relocation = htab->sgot->output_offset + off;
2826 if (r_type == R_390_TLS_IEENT)
2827 relocation += htab->sgot->output_section->vma;
2828 unresolved_reloc = FALSE;
2829 break;
2830
2831 case R_390_TLS_LDM64:
2832 if (! info->shared)
2833 /* The literal pool entry this relocation refers to gets ignored
2834 by the optimized code of the local exec model. Do nothing
2835 and the value will turn out zero. */
2836 continue;
2837
2838 if (htab->sgot == NULL)
2839 abort ();
2840
2841 off = htab->tls_ldm_got.offset;
2842 if (off & 1)
2843 off &= ~1;
2844 else
2845 {
2846 Elf_Internal_Rela outrel;
2847 bfd_byte *loc;
2848
2849 if (htab->srelgot == NULL)
2850 abort ();
2851
2852 outrel.r_offset = (htab->sgot->output_section->vma
2853 + htab->sgot->output_offset + off);
2854
2855 bfd_put_64 (output_bfd, 0,
2856 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2857 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
2858 outrel.r_addend = 0;
2859 loc = htab->srelgot->contents;
2860 loc += htab->srelgot->reloc_count++
2861 * sizeof (Elf64_External_Rela);
2862 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2863 htab->tls_ldm_got.offset |= 1;
2864 }
2865 relocation = htab->sgot->output_offset + off;
2866 unresolved_reloc = FALSE;
2867 break;
2868
2869 case R_390_TLS_LE64:
2870 if (info->shared)
2871 {
2872 /* Linking a shared library with non-fpic code requires
2873 a R_390_TLS_TPOFF relocation. */
2874 Elf_Internal_Rela outrel;
2875 asection *sreloc;
2876 bfd_byte *loc;
2877 int indx;
2878
2879 outrel.r_offset = rel->r_offset
2880 + input_section->output_section->vma
2881 + input_section->output_offset;
2882 if (h != NULL && h->dynindx != -1)
2883 indx = h->dynindx;
2884 else
2885 indx = 0;
2886 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
2887 if (indx == 0)
2888 outrel.r_addend = relocation - dtpoff_base (info);
2889 else
2890 outrel.r_addend = 0;
2891 sreloc = elf_section_data (input_section)->sreloc;
2892 if (sreloc == NULL)
2893 abort ();
2894 loc = sreloc->contents;
2895 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2896 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2897 }
2898 else
2899 {
2900 BFD_ASSERT (! unresolved_reloc);
2901 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2902 contents + rel->r_offset);
2903 }
2904 continue;
2905
2906 case R_390_TLS_LDO64:
2907 if (info->shared)
2908 relocation -= dtpoff_base (info);
2909 else
2910 /* When converting LDO to LE, we must negate. */
2911 relocation = -tpoff (info, relocation);
2912 break;
2913
2914 /* Relocations for tls instructions. */
2915 case R_390_TLS_LOAD:
2916 case R_390_TLS_GDCALL:
2917 case R_390_TLS_LDCALL:
2918 tls_type = GOT_UNKNOWN;
2919 if (h == NULL && local_got_offsets)
2920 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2921 else if (h != NULL)
2922 tls_type = elf_s390_hash_entry(h)->tls_type;
2923
2924 if (tls_type == GOT_TLS_GD)
2925 continue;
2926
2927 if (r_type == R_390_TLS_LOAD)
2928 {
2929 if (!info->shared && (h == NULL || h->dynindx == -1))
2930 {
2931 /* IE->LE transition. Four valid cases:
2932 lg %rx,(0,%ry) -> sllg %rx,%ry,0
2933 lg %rx,(%ry,0) -> sllg %rx,%ry,0
2934 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
2935 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
2936 unsigned int insn0, insn1, ry;
2937
2938 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2939 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2940 if (insn1 != 0x0004)
2941 invalid_tls_insn (input_bfd, input_section, rel);
2942 ry = 0;
2943 if ((insn0 & 0xff00f000) == 0xe3000000)
2944 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
2945 ry = (insn0 & 0x000f0000);
2946 else if ((insn0 & 0xff0f0000) == 0xe3000000)
2947 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
2948 ry = (insn0 & 0x0000f000) << 4;
2949 else if ((insn0 & 0xff00f000) == 0xe300c000)
2950 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
2951 ry = (insn0 & 0x000f0000);
2952 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
2953 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
2954 ry = (insn0 & 0x0000f000) << 4;
2955 else
2956 invalid_tls_insn (input_bfd, input_section, rel);
2957 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
2958 insn1 = 0x000d;
2959 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2960 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2961 }
2962 }
2963 else if (r_type == R_390_TLS_GDCALL)
2964 {
2965 unsigned int insn0, insn1;
2966
2967 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2968 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2969 if ((insn0 & 0xffff0000) != 0xc0e50000)
2970 invalid_tls_insn (input_bfd, input_section, rel);
2971 if (!info->shared && (h == NULL || h->dynindx == -1))
2972 {
2973 /* GD->LE transition.
2974 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2975 insn0 = 0xc0040000;
2976 insn1 = 0x0000;
2977 }
2978 else
2979 {
2980 /* GD->IE transition.
2981 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
2982 insn0 = 0xe322c000;
2983 insn1 = 0x0004;
2984 }
2985 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2986 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2987 }
2988 else if (r_type == R_390_TLS_LDCALL)
2989 {
2990 if (!info->shared)
2991 {
2992 unsigned int insn0, insn1;
2993
2994 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2995 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2996 if ((insn0 & 0xffff0000) != 0xc0e50000)
2997 invalid_tls_insn (input_bfd, input_section, rel);
2998 /* LD->LE transition.
2999 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
3000 insn0 = 0xc0040000;
3001 insn1 = 0x0000;
3002 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
3003 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
3004 }
3005 }
3006 continue;
3007
3008 default:
3009 break;
3010 }
3011
3012 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3013 because such sections are not SEC_ALLOC and thus ld.so will
3014 not process them. */
3015 if (unresolved_reloc
3016 && !((input_section->flags & SEC_DEBUGGING) != 0
3017 && h->def_dynamic))
3018 (*_bfd_error_handler)
3019 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3020 input_bfd,
3021 input_section,
3022 (long) rel->r_offset,
3023 howto->name,
3024 h->root.root.string);
3025
3026 if (r_type == R_390_20
3027 || r_type == R_390_GOT20
3028 || r_type == R_390_GOTPLT20
3029 || r_type == R_390_TLS_GOTIE20)
3030 {
3031 relocation += rel->r_addend;
3032 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3033 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3034 contents, rel->r_offset,
3035 relocation, 0);
3036 }
3037 else
3038 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3039 contents, rel->r_offset,
3040 relocation, rel->r_addend);
3041
3042 if (r != bfd_reloc_ok)
3043 {
3044 const char *name;
3045
3046 if (h != NULL)
3047 name = h->root.root.string;
3048 else
3049 {
3050 name = bfd_elf_string_from_elf_section (input_bfd,
3051 symtab_hdr->sh_link,
3052 sym->st_name);
3053 if (name == NULL)
3054 return FALSE;
3055 if (*name == '\0')
3056 name = bfd_section_name (input_bfd, sec);
3057 }
3058
3059 if (r == bfd_reloc_overflow)
3060 {
3061
3062 if (! ((*info->callbacks->reloc_overflow)
3063 (info, (h ? &h->root : NULL), name, howto->name,
3064 (bfd_vma) 0, input_bfd, input_section,
3065 rel->r_offset)))
3066 return FALSE;
3067 }
3068 else
3069 {
3070 (*_bfd_error_handler)
3071 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3072 input_bfd, input_section,
3073 (long) rel->r_offset, name, (int) r);
3074 return FALSE;
3075 }
3076 }
3077 }
3078
3079 return TRUE;
3080 }
3081
3082 /* Finish up dynamic symbol handling. We set the contents of various
3083 dynamic sections here. */
3084
3085 static bfd_boolean
3086 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3087 bfd *output_bfd;
3088 struct bfd_link_info *info;
3089 struct elf_link_hash_entry *h;
3090 Elf_Internal_Sym *sym;
3091 {
3092 struct elf_s390_link_hash_table *htab;
3093
3094 htab = elf_s390_hash_table (info);
3095
3096 if (h->plt.offset != (bfd_vma) -1)
3097 {
3098 bfd_vma plt_index;
3099 bfd_vma got_offset;
3100 Elf_Internal_Rela rela;
3101 bfd_byte *loc;
3102
3103 /* This symbol has an entry in the procedure linkage table. Set
3104 it up. */
3105
3106 if (h->dynindx == -1
3107 || htab->splt == NULL
3108 || htab->sgotplt == NULL
3109 || htab->srelplt == NULL)
3110 abort ();
3111
3112 /* Calc. index no.
3113 Current offset - size first entry / entry size. */
3114 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3115
3116 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
3117 addr & GOT addr. */
3118 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3119
3120 /* Fill in the blueprint of a PLT. */
3121 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3122 htab->splt->contents + h->plt.offset);
3123 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3124 htab->splt->contents + h->plt.offset + 4);
3125 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3126 htab->splt->contents + h->plt.offset + 8);
3127 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3128 htab->splt->contents + h->plt.offset + 12);
3129 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3130 htab->splt->contents + h->plt.offset + 16);
3131 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5,
3132 htab->splt->contents + h->plt.offset + 20);
3133 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6,
3134 htab->splt->contents + h->plt.offset + 24);
3135 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7,
3136 htab->splt->contents + h->plt.offset + 28);
3137 /* Fixup the relative address to the GOT entry */
3138 bfd_put_32 (output_bfd,
3139 (htab->sgotplt->output_section->vma +
3140 htab->sgotplt->output_offset + got_offset
3141 - (htab->splt->output_section->vma + h->plt.offset))/2,
3142 htab->splt->contents + h->plt.offset + 2);
3143 /* Fixup the relative branch to PLT 0 */
3144 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3145 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3146 htab->splt->contents + h->plt.offset + 24);
3147 /* Fixup offset into symbol table */
3148 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3149 htab->splt->contents + h->plt.offset + 28);
3150
3151 /* Fill in the entry in the global offset table.
3152 Points to instruction after GOT offset. */
3153 bfd_put_64 (output_bfd,
3154 (htab->splt->output_section->vma
3155 + htab->splt->output_offset
3156 + h->plt.offset
3157 + 14),
3158 htab->sgotplt->contents + got_offset);
3159
3160 /* Fill in the entry in the .rela.plt section. */
3161 rela.r_offset = (htab->sgotplt->output_section->vma
3162 + htab->sgotplt->output_offset
3163 + got_offset);
3164 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3165 rela.r_addend = 0;
3166 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela);
3167 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3168
3169 if (!h->def_regular)
3170 {
3171 /* Mark the symbol as undefined, rather than as defined in
3172 the .plt section. Leave the value alone. This is a clue
3173 for the dynamic linker, to make function pointer
3174 comparisons work between an application and shared
3175 library. */
3176 sym->st_shndx = SHN_UNDEF;
3177 }
3178 }
3179
3180 if (h->got.offset != (bfd_vma) -1
3181 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3182 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3183 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3184 {
3185 Elf_Internal_Rela rela;
3186 bfd_byte *loc;
3187
3188 /* This symbol has an entry in the global offset table. Set it
3189 up. */
3190 if (htab->sgot == NULL || htab->srelgot == NULL)
3191 abort ();
3192
3193 rela.r_offset = (htab->sgot->output_section->vma
3194 + htab->sgot->output_offset
3195 + (h->got.offset &~ (bfd_vma) 1));
3196
3197 /* If this is a static link, or it is a -Bsymbolic link and the
3198 symbol is defined locally or was forced to be local because
3199 of a version file, we just want to emit a RELATIVE reloc.
3200 The entry in the global offset table will already have been
3201 initialized in the relocate_section function. */
3202 if (info->shared
3203 && (info->symbolic
3204 || h->dynindx == -1
3205 || h->forced_local)
3206 && h->def_regular)
3207 {
3208 BFD_ASSERT((h->got.offset & 1) != 0);
3209 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3210 rela.r_addend = (h->root.u.def.value
3211 + h->root.u.def.section->output_section->vma
3212 + h->root.u.def.section->output_offset);
3213 }
3214 else
3215 {
3216 BFD_ASSERT((h->got.offset & 1) == 0);
3217 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3218 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3219 rela.r_addend = 0;
3220 }
3221
3222 loc = htab->srelgot->contents;
3223 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3224 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3225 }
3226
3227 if (h->needs_copy)
3228 {
3229 Elf_Internal_Rela rela;
3230 bfd_byte *loc;
3231
3232 /* This symbols needs a copy reloc. Set it up. */
3233
3234 if (h->dynindx == -1
3235 || (h->root.type != bfd_link_hash_defined
3236 && h->root.type != bfd_link_hash_defweak)
3237 || htab->srelbss == NULL)
3238 abort ();
3239
3240 rela.r_offset = (h->root.u.def.value
3241 + h->root.u.def.section->output_section->vma
3242 + h->root.u.def.section->output_offset);
3243 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3244 rela.r_addend = 0;
3245 loc = htab->srelbss->contents;
3246 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3247 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3248 }
3249
3250 /* Mark some specially defined symbols as absolute. */
3251 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3252 || h == htab->elf.hgot
3253 || h == htab->elf.hplt)
3254 sym->st_shndx = SHN_ABS;
3255
3256 return TRUE;
3257 }
3258
3259 /* Used to decide how to sort relocs in an optimal manner for the
3260 dynamic linker, before writing them out. */
3261
3262 static enum elf_reloc_type_class
3263 elf_s390_reloc_type_class (rela)
3264 const Elf_Internal_Rela *rela;
3265 {
3266 switch ((int) ELF64_R_TYPE (rela->r_info))
3267 {
3268 case R_390_RELATIVE:
3269 return reloc_class_relative;
3270 case R_390_JMP_SLOT:
3271 return reloc_class_plt;
3272 case R_390_COPY:
3273 return reloc_class_copy;
3274 default:
3275 return reloc_class_normal;
3276 }
3277 }
3278
3279 /* Finish up the dynamic sections. */
3280
3281 static bfd_boolean
3282 elf_s390_finish_dynamic_sections (output_bfd, info)
3283 bfd *output_bfd;
3284 struct bfd_link_info *info;
3285 {
3286 struct elf_s390_link_hash_table *htab;
3287 bfd *dynobj;
3288 asection *sdyn;
3289
3290 htab = elf_s390_hash_table (info);
3291 dynobj = htab->elf.dynobj;
3292 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3293
3294 if (htab->elf.dynamic_sections_created)
3295 {
3296 Elf64_External_Dyn *dyncon, *dynconend;
3297
3298 if (sdyn == NULL || htab->sgot == NULL)
3299 abort ();
3300
3301 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3302 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3303 for (; dyncon < dynconend; dyncon++)
3304 {
3305 Elf_Internal_Dyn dyn;
3306 asection *s;
3307
3308 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3309
3310 switch (dyn.d_tag)
3311 {
3312 default:
3313 continue;
3314
3315 case DT_PLTGOT:
3316 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3317 break;
3318
3319 case DT_JMPREL:
3320 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3321 break;
3322
3323 case DT_PLTRELSZ:
3324 s = htab->srelplt->output_section;
3325 dyn.d_un.d_val = s->size;
3326 break;
3327
3328 case DT_RELASZ:
3329 /* The procedure linkage table relocs (DT_JMPREL) should
3330 not be included in the overall relocs (DT_RELA).
3331 Therefore, we override the DT_RELASZ entry here to
3332 make it not include the JMPREL relocs. Since the
3333 linker script arranges for .rela.plt to follow all
3334 other relocation sections, we don't have to worry
3335 about changing the DT_RELA entry. */
3336 s = htab->srelplt->output_section;
3337 dyn.d_un.d_val -= s->size;
3338 break;
3339 }
3340
3341 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3342 }
3343
3344 /* Fill in the special first entry in the procedure linkage table. */
3345 if (htab->splt && htab->splt->size > 0)
3346 {
3347 /* fill in blueprint for plt 0 entry */
3348 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0,
3349 htab->splt->contents );
3350 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3351 htab->splt->contents +4 );
3352 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3353 htab->splt->contents +12 );
3354 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3355 htab->splt->contents +16 );
3356 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3357 htab->splt->contents +20 );
3358 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6,
3359 htab->splt->contents + 24);
3360 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7,
3361 htab->splt->contents + 28 );
3362 /* Fixup relative address to start of GOT */
3363 bfd_put_32 (output_bfd,
3364 (htab->sgotplt->output_section->vma +
3365 htab->sgotplt->output_offset
3366 - htab->splt->output_section->vma - 6)/2,
3367 htab->splt->contents + 8);
3368 }
3369 elf_section_data (htab->splt->output_section)
3370 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE;
3371 }
3372
3373 if (htab->sgotplt)
3374 {
3375 /* Fill in the first three entries in the global offset table. */
3376 if (htab->sgotplt->size > 0)
3377 {
3378 bfd_put_64 (output_bfd,
3379 (sdyn == NULL ? (bfd_vma) 0
3380 : sdyn->output_section->vma + sdyn->output_offset),
3381 htab->sgotplt->contents);
3382 /* One entry for shared object struct ptr. */
3383 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3384 /* One entry for _dl_runtime_resolve. */
3385 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12);
3386 }
3387
3388 elf_section_data (htab->sgot->output_section)
3389 ->this_hdr.sh_entsize = 8;
3390 }
3391 return TRUE;
3392 }
3393
3394 /* Return address for Ith PLT stub in section PLT, for relocation REL
3395 or (bfd_vma) -1 if it should not be included. */
3396
3397 static bfd_vma
3398 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3399 const arelent *rel ATTRIBUTE_UNUSED)
3400 {
3401 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3402 }
3403
3404
3405 /* Why was the hash table entry size definition changed from
3406 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3407 this is the only reason for the s390_elf64_size_info structure. */
3408
3409 const struct elf_size_info s390_elf64_size_info =
3410 {
3411 sizeof (Elf64_External_Ehdr),
3412 sizeof (Elf64_External_Phdr),
3413 sizeof (Elf64_External_Shdr),
3414 sizeof (Elf64_External_Rel),
3415 sizeof (Elf64_External_Rela),
3416 sizeof (Elf64_External_Sym),
3417 sizeof (Elf64_External_Dyn),
3418 sizeof (Elf_External_Note),
3419 8, /* hash-table entry size. */
3420 1, /* internal relocations per external relocations. */
3421 64, /* arch_size. */
3422 3, /* log_file_align. */
3423 ELFCLASS64, EV_CURRENT,
3424 bfd_elf64_write_out_phdrs,
3425 bfd_elf64_write_shdrs_and_ehdr,
3426 bfd_elf64_checksum_contents,
3427 bfd_elf64_write_relocs,
3428 bfd_elf64_swap_symbol_in,
3429 bfd_elf64_swap_symbol_out,
3430 bfd_elf64_slurp_reloc_table,
3431 bfd_elf64_slurp_symbol_table,
3432 bfd_elf64_swap_dyn_in,
3433 bfd_elf64_swap_dyn_out,
3434 bfd_elf64_swap_reloc_in,
3435 bfd_elf64_swap_reloc_out,
3436 bfd_elf64_swap_reloca_in,
3437 bfd_elf64_swap_reloca_out
3438 };
3439
3440 #define TARGET_BIG_SYM bfd_elf64_s390_vec
3441 #define TARGET_BIG_NAME "elf64-s390"
3442 #define ELF_ARCH bfd_arch_s390
3443 #define ELF_MACHINE_CODE EM_S390
3444 #define ELF_MACHINE_ALT1 EM_S390_OLD
3445 #define ELF_MAXPAGESIZE 0x1000
3446
3447 #define elf_backend_size_info s390_elf64_size_info
3448
3449 #define elf_backend_can_gc_sections 1
3450 #define elf_backend_can_refcount 1
3451 #define elf_backend_want_got_plt 1
3452 #define elf_backend_plt_readonly 1
3453 #define elf_backend_want_plt_sym 0
3454 #define elf_backend_got_header_size 24
3455 #define elf_backend_rela_normal 1
3456
3457 #define elf_info_to_howto elf_s390_info_to_howto
3458
3459 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3460 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3461 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3462 #define bfd_elf64_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
3463
3464 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3465 #define elf_backend_check_relocs elf_s390_check_relocs
3466 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3467 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3468 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3469 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3470 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3471 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3472 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3473 #define elf_backend_relocate_section elf_s390_relocate_section
3474 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3475 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3476 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3477 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3478
3479 #define bfd_elf64_mkobject elf_s390_mkobject
3480 #define elf_backend_object_p elf_s390_object_p
3481
3482 #include "elf64-target.h"
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