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2005-05-20 Paolo Bonzini <bonzini@gnu.org>
[binutils.git] / bfd / elf32-s390.c
blob62ed07a11356866350ccae8f55354f9956458192
1 /* IBM S/390-specific support for 32-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005
3 Free Software Foundation, Inc.
4 Contributed by Carl B. Pedersen and Martin Schwidefsky.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23 #include "bfd.h"
24 #include "sysdep.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28
29 static reloc_howto_type *elf_s390_reloc_type_lookup
30 PARAMS ((bfd *, bfd_reloc_code_real_type));
31 static void elf_s390_info_to_howto
32 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
33 static bfd_boolean elf_s390_is_local_label_name
34 PARAMS ((bfd *, const char *));
35 static struct bfd_hash_entry *link_hash_newfunc
36 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
37 static struct bfd_link_hash_table *elf_s390_link_hash_table_create
38 PARAMS ((bfd *));
39 static bfd_boolean create_got_section
40 PARAMS((bfd *, struct bfd_link_info *));
41 static bfd_boolean elf_s390_create_dynamic_sections
42 PARAMS((bfd *, struct bfd_link_info *));
43 static void elf_s390_copy_indirect_symbol
44 PARAMS ((const struct elf_backend_data *, struct elf_link_hash_entry *,
45 struct elf_link_hash_entry *));
46 static bfd_boolean elf_s390_check_relocs
47 PARAMS ((bfd *, struct bfd_link_info *, asection *,
48 const Elf_Internal_Rela *));
49 static asection *elf_s390_gc_mark_hook
50 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
51 struct elf_link_hash_entry *, Elf_Internal_Sym *));
52 static bfd_boolean elf_s390_gc_sweep_hook
53 PARAMS ((bfd *, struct bfd_link_info *, asection *,
54 const Elf_Internal_Rela *));
55 struct elf_s390_link_hash_entry;
56 static void elf_s390_adjust_gotplt
57 PARAMS ((struct elf_s390_link_hash_entry *));
58 static bfd_boolean elf_s390_adjust_dynamic_symbol
59 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
60 static bfd_boolean allocate_dynrelocs
61 PARAMS ((struct elf_link_hash_entry *, PTR));
62 static bfd_boolean readonly_dynrelocs
63 PARAMS ((struct elf_link_hash_entry *, PTR));
64 static bfd_boolean elf_s390_size_dynamic_sections
65 PARAMS ((bfd *, struct bfd_link_info *));
66 static bfd_boolean elf_s390_relocate_section
67 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
68 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
69 static bfd_boolean elf_s390_finish_dynamic_symbol
70 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
71 Elf_Internal_Sym *));
72 static enum elf_reloc_type_class elf_s390_reloc_type_class
73 PARAMS ((const Elf_Internal_Rela *));
74 static bfd_boolean elf_s390_finish_dynamic_sections
75 PARAMS ((bfd *, struct bfd_link_info *));
76 static bfd_boolean elf_s390_mkobject
77 PARAMS ((bfd *));
78 static bfd_boolean elf_s390_object_p
79 PARAMS ((bfd *));
80 static bfd_boolean elf_s390_grok_prstatus
81 PARAMS ((bfd *, Elf_Internal_Note *));
82 static int elf_s390_tls_transition
83 PARAMS ((struct bfd_link_info *, int, int));
84 static bfd_reloc_status_type s390_tls_reloc
85 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
86 static bfd_vma dtpoff_base
87 PARAMS ((struct bfd_link_info *));
88 static bfd_vma tpoff
89 PARAMS ((struct bfd_link_info *, bfd_vma));
90 static void invalid_tls_insn
91 PARAMS ((bfd *, asection *, Elf_Internal_Rela *));
92 static bfd_reloc_status_type s390_elf_ldisp_reloc
93 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
94
95 #include "elf/s390.h"
96
97 /* The relocation "howto" table. */
98
99 static reloc_howto_type elf_howto_table[] =
100 {
101 HOWTO (R_390_NONE, /* type */
102 0, /* rightshift */
103 0, /* size (0 = byte, 1 = short, 2 = long) */
104 0, /* bitsize */
105 FALSE, /* pc_relative */
106 0, /* bitpos */
107 complain_overflow_dont, /* complain_on_overflow */
108 bfd_elf_generic_reloc, /* special_function */
109 "R_390_NONE", /* name */
110 FALSE, /* partial_inplace */
111 0, /* src_mask */
112 0, /* dst_mask */
113 FALSE), /* pcrel_offset */
114
115 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
116 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
117 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
118 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
119 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
121 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
123 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
125 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
127 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
129 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
131 HOWTO(R_390_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,0xffffffff, FALSE),
133 HOWTO(R_390_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
134 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,0xffffffff, FALSE),
135 HOWTO(R_390_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
136 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,0xffffffff, FALSE),
137 HOWTO(R_390_RELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,0xffffffff, FALSE),
139 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
140 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,0xffffffff, FALSE),
141 HOWTO(R_390_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
142 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,0xffffffff, TRUE),
143 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
145 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
146 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
147 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
148 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
149 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
150 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
151 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
152 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
153 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
154 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
155 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
156 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,0xffffffff, TRUE),
157 EMPTY_HOWTO (R_390_64), /* Empty entry for R_390_64. */
158 EMPTY_HOWTO (R_390_PC64), /* Empty entry for R_390_PC64. */
159 EMPTY_HOWTO (R_390_GOT64), /* Empty entry for R_390_GOT64. */
160 EMPTY_HOWTO (R_390_PLT64), /* Empty entry for R_390_PLT64. */
161 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
162 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,0xffffffff, TRUE),
163 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
164 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
165 EMPTY_HOWTO (R_390_GOTOFF64), /* Empty entry for R_390_GOTOFF64. */
166 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
167 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
168 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
169 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
170 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
171 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
172 EMPTY_HOWTO (R_390_GOTPLT64), /* Empty entry for R_390_GOTPLT64. */
173 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
174 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,0xffffffff, TRUE),
175 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
176 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
177 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
178 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
179 EMPTY_HOWTO (R_390_PLTOFF64), /* Empty entry for R_390_PLTOFF64. */
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 HOWTO(R_390_TLS_GD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
187 bfd_elf_generic_reloc, "R_390_TLS_GD32", FALSE, 0, 0xffffffff, FALSE),
188 EMPTY_HOWTO (R_390_TLS_GD64), /* Empty entry for R_390_TLS_GD64. */
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 HOWTO(R_390_TLS_GOTIE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
192 bfd_elf_generic_reloc, "R_390_TLS_GOTIE32", FALSE, 0, 0xffffffff, FALSE),
193 EMPTY_HOWTO (R_390_TLS_GOTIE64), /* Empty entry for R_390_TLS_GOTIE64. */
194 HOWTO(R_390_TLS_LDM32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
195 bfd_elf_generic_reloc, "R_390_TLS_LDM32", FALSE, 0, 0xffffffff, FALSE),
196 EMPTY_HOWTO (R_390_TLS_LDM64), /* Empty entry for R_390_TLS_LDM64. */
197 HOWTO(R_390_TLS_IE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
198 bfd_elf_generic_reloc, "R_390_TLS_IE32", FALSE, 0, 0xffffffff, FALSE),
199 EMPTY_HOWTO (R_390_TLS_IE64), /* Empty entry for R_390_TLS_IE64. */
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, 0xffffffff, TRUE),
202 HOWTO(R_390_TLS_LE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
203 bfd_elf_generic_reloc, "R_390_TLS_LE32", FALSE, 0, 0xffffffff, FALSE),
204 EMPTY_HOWTO (R_390_TLS_LE64), /* Empty entry for R_390_TLS_LE64. */
205 HOWTO(R_390_TLS_LDO32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
206 bfd_elf_generic_reloc, "R_390_TLS_LDO32", FALSE, 0, 0xffffffff, FALSE),
207 EMPTY_HOWTO (R_390_TLS_LDO64), /* Empty entry for R_390_TLS_LDO64. */
208 HOWTO(R_390_TLS_DTPMOD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
209 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, 0xffffffff, FALSE),
210 HOWTO(R_390_TLS_DTPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
211 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, 0xffffffff, FALSE),
212 HOWTO(R_390_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
213 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, 0xffffffff, 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 elf32_s390_vtinherit_howto =
226 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
227 static reloc_howto_type elf32_s390_vtentry_howto =
228 HOWTO (R_390_GNU_VTENTRY, 0,2,0,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_390_GOTENT:
284 return &elf_howto_table[(int) R_390_GOTENT];
285 case BFD_RELOC_16_GOTOFF:
286 return &elf_howto_table[(int) R_390_GOTOFF16];
287 case BFD_RELOC_390_GOTPLT12:
288 return &elf_howto_table[(int) R_390_GOTPLT12];
289 case BFD_RELOC_390_GOTPLT16:
290 return &elf_howto_table[(int) R_390_GOTPLT16];
291 case BFD_RELOC_390_GOTPLT32:
292 return &elf_howto_table[(int) R_390_GOTPLT32];
293 case BFD_RELOC_390_GOTPLTENT:
294 return &elf_howto_table[(int) R_390_GOTPLTENT];
295 case BFD_RELOC_390_PLTOFF16:
296 return &elf_howto_table[(int) R_390_PLTOFF16];
297 case BFD_RELOC_390_PLTOFF32:
298 return &elf_howto_table[(int) R_390_PLTOFF32];
299 case BFD_RELOC_390_TLS_LOAD:
300 return &elf_howto_table[(int) R_390_TLS_LOAD];
301 case BFD_RELOC_390_TLS_GDCALL:
302 return &elf_howto_table[(int) R_390_TLS_GDCALL];
303 case BFD_RELOC_390_TLS_LDCALL:
304 return &elf_howto_table[(int) R_390_TLS_LDCALL];
305 case BFD_RELOC_390_TLS_GD32:
306 return &elf_howto_table[(int) R_390_TLS_GD32];
307 case BFD_RELOC_390_TLS_GOTIE12:
308 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
309 case BFD_RELOC_390_TLS_GOTIE32:
310 return &elf_howto_table[(int) R_390_TLS_GOTIE32];
311 case BFD_RELOC_390_TLS_LDM32:
312 return &elf_howto_table[(int) R_390_TLS_LDM32];
313 case BFD_RELOC_390_TLS_IE32:
314 return &elf_howto_table[(int) R_390_TLS_IE32];
315 case BFD_RELOC_390_TLS_IEENT:
316 return &elf_howto_table[(int) R_390_TLS_IEENT];
317 case BFD_RELOC_390_TLS_LE32:
318 return &elf_howto_table[(int) R_390_TLS_LE32];
319 case BFD_RELOC_390_TLS_LDO32:
320 return &elf_howto_table[(int) R_390_TLS_LDO32];
321 case BFD_RELOC_390_TLS_DTPMOD:
322 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
323 case BFD_RELOC_390_TLS_DTPOFF:
324 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
325 case BFD_RELOC_390_TLS_TPOFF:
326 return &elf_howto_table[(int) R_390_TLS_TPOFF];
327 case BFD_RELOC_390_20:
328 return &elf_howto_table[(int) R_390_20];
329 case BFD_RELOC_390_GOT20:
330 return &elf_howto_table[(int) R_390_GOT20];
331 case BFD_RELOC_390_GOTPLT20:
332 return &elf_howto_table[(int) R_390_GOTPLT20];
333 case BFD_RELOC_390_TLS_GOTIE20:
334 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
335 case BFD_RELOC_VTABLE_INHERIT:
336 return &elf32_s390_vtinherit_howto;
337 case BFD_RELOC_VTABLE_ENTRY:
338 return &elf32_s390_vtentry_howto;
339 default:
340 break;
341 }
342 return 0;
343 }
344
345 /* We need to use ELF32_R_TYPE so we have our own copy of this function,
346 and elf32-s390.c has its own copy. */
347
348 static void
349 elf_s390_info_to_howto (abfd, cache_ptr, dst)
350 bfd *abfd ATTRIBUTE_UNUSED;
351 arelent *cache_ptr;
352 Elf_Internal_Rela *dst;
353 {
354 switch (ELF32_R_TYPE(dst->r_info))
355 {
356 case R_390_GNU_VTINHERIT:
357 cache_ptr->howto = &elf32_s390_vtinherit_howto;
358 break;
359
360 case R_390_GNU_VTENTRY:
361 cache_ptr->howto = &elf32_s390_vtentry_howto;
362 break;
363
364 default:
365 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_390_max);
366 cache_ptr->howto = &elf_howto_table[ELF32_R_TYPE(dst->r_info)];
367 }
368 }
369
370 /* A relocation function which doesn't do anything. */
371 static bfd_reloc_status_type
372 s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section,
373 output_bfd, error_message)
374 bfd *abfd ATTRIBUTE_UNUSED;
375 arelent *reloc_entry;
376 asymbol *symbol ATTRIBUTE_UNUSED;
377 PTR data ATTRIBUTE_UNUSED;
378 asection *input_section;
379 bfd *output_bfd;
380 char **error_message ATTRIBUTE_UNUSED;
381 {
382 if (output_bfd)
383 reloc_entry->address += input_section->output_offset;
384 return bfd_reloc_ok;
385 }
386
387 /* Handle the large displacement relocs. */
388 static bfd_reloc_status_type
389 s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section,
390 output_bfd, error_message)
391 bfd *abfd ATTRIBUTE_UNUSED;
392 arelent *reloc_entry;
393 asymbol *symbol;
394 PTR data ATTRIBUTE_UNUSED;
395 asection *input_section;
396 bfd *output_bfd;
397 char **error_message ATTRIBUTE_UNUSED;
398 {
399 reloc_howto_type *howto = reloc_entry->howto;
400 bfd_vma relocation;
401 bfd_vma insn;
402
403 if (output_bfd != (bfd *) NULL
404 && (symbol->flags & BSF_SECTION_SYM) == 0
405 && (! howto->partial_inplace
406 || reloc_entry->addend == 0))
407 {
408 reloc_entry->address += input_section->output_offset;
409 return bfd_reloc_ok;
410 }
411
412 if (output_bfd != NULL)
413 return bfd_reloc_continue;
414
415 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
416 return bfd_reloc_outofrange;
417
418 relocation = (symbol->value
419 + symbol->section->output_section->vma
420 + symbol->section->output_offset);
421 relocation += reloc_entry->addend;
422 if (howto->pc_relative)
423 {
424 relocation -= (input_section->output_section->vma
425 + input_section->output_offset);
426 relocation -= reloc_entry->address;
427 }
428
429 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
430 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
431 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
432
433 if ((bfd_signed_vma) relocation < - 0x80000
434 || (bfd_signed_vma) relocation > 0x7ffff)
435 return bfd_reloc_overflow;
436 else
437 return bfd_reloc_ok;
438 }
439
440 static bfd_boolean
441 elf_s390_is_local_label_name (abfd, name)
442 bfd *abfd;
443 const char *name;
444 {
445 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
446 return TRUE;
447
448 return _bfd_elf_is_local_label_name (abfd, name);
449 }
450
451 /* Functions for the 390 ELF linker. */
452
453 /* The name of the dynamic interpreter. This is put in the .interp
454 section. */
455
456 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
457
458 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
459 copying dynamic variables from a shared lib into an app's dynbss
460 section, and instead use a dynamic relocation to point into the
461 shared lib. */
462 #define ELIMINATE_COPY_RELOCS 1
463
464 /* The size in bytes of the first entry in the procedure linkage table. */
465 #define PLT_FIRST_ENTRY_SIZE 32
466 /* The size in bytes of an entry in the procedure linkage table. */
467 #define PLT_ENTRY_SIZE 32
468
469 #define GOT_ENTRY_SIZE 4
470
471 /* The first three entries in a procedure linkage table are reserved,
472 and the initial contents are unimportant (we zero them out).
473 Subsequent entries look like this. See the SVR4 ABI 386
474 supplement to see how this works. */
475
476 /* For the s390, simple addr offset can only be 0 - 4096.
477 To use the full 2 GB address space, several instructions
478 are needed to load an address in a register and execute
479 a branch( or just saving the address)
480
481 Furthermore, only r 0 and 1 are free to use!!! */
482
483 /* The first 3 words in the GOT are then reserved.
484 Word 0 is the address of the dynamic table.
485 Word 1 is a pointer to a structure describing the object
486 Word 2 is used to point to the loader entry address.
487
488 The code for position independent PLT entries looks like this:
489
490 r12 holds addr of the current GOT at entry to the PLT
491
492 The GOT holds the address in the PLT to be executed.
493 The loader then gets:
494 24(15) = Pointer to the structure describing the object.
495 28(15) = Offset in symbol table
496
497 The loader must then find the module where the function is
498 and insert the address in the GOT.
499
500 Note: 390 can only address +- 64 K relative.
501 We check if offset > 65536, then make a relative branch -64xxx
502 back to a previous defined branch
503
504 PLT1: BASR 1,0 # 2 bytes
505 L 1,22(1) # 4 bytes Load offset in GOT in r 1
506 L 1,(1,12) # 4 bytes Load address from GOT in r1
507 BCR 15,1 # 2 bytes Jump to address
508 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
509 L 1,14(1) # 4 bytes Load offset in symol table in r1
510 BRC 15,-x # 4 bytes Jump to start of PLT
511 .word 0 # 2 bytes filler
512 .long ? # 4 bytes offset in GOT
513 .long ? # 4 bytes offset into symbol table
514
515 This was the general case. There are two additional, optimizes PLT
516 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768.
517 First the one for GOT offsets < 4096:
518
519 PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1
520 BCR 15,1 # 2 bytes Jump to address
521 .word 0,0,0 # 6 bytes filler
522 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
523 L 1,14(1) # 4 bytes Load offset in symbol table in r1
524 BRC 15,-x # 4 bytes Jump to start of PLT
525 .word 0,0,0 # 6 bytes filler
526 .long ? # 4 bytes offset into symbol table
527
528 Second the one for GOT offsets < 32768:
529
530 PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1
531 L 1,(1,12) # 4 bytes Load address from GOT to r1
532 BCR 15,1 # 2 bytes Jump to address
533 .word 0 # 2 bytes filler
534 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
535 L 1,14(1) # 4 bytes Load offset in symbol table in r1
536 BRC 15,-x # 4 bytes Jump to start of PLT
537 .word 0,0,0 # 6 bytes filler
538 .long ? # 4 bytes offset into symbol table
539
540 Total = 32 bytes per PLT entry
541
542 The code for static build PLT entries looks like this:
543
544 PLT1: BASR 1,0 # 2 bytes
545 L 1,22(1) # 4 bytes Load address of GOT entry
546 L 1,0(0,1) # 4 bytes Load address from GOT in r1
547 BCR 15,1 # 2 bytes Jump to address
548 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
549 L 1,14(1) # 4 bytes Load offset in symbol table in r1
550 BRC 15,-x # 4 bytes Jump to start of PLT
551 .word 0 # 2 bytes filler
552 .long ? # 4 bytes address of GOT entry
553 .long ? # 4 bytes offset into symbol table */
554
555 #define PLT_PIC_ENTRY_WORD0 0x0d105810
556 #define PLT_PIC_ENTRY_WORD1 0x10165811
557 #define PLT_PIC_ENTRY_WORD2 0xc00007f1
558 #define PLT_PIC_ENTRY_WORD3 0x0d105810
559 #define PLT_PIC_ENTRY_WORD4 0x100ea7f4
560
561 #define PLT_PIC12_ENTRY_WORD0 0x5810c000
562 #define PLT_PIC12_ENTRY_WORD1 0x07f10000
563 #define PLT_PIC12_ENTRY_WORD2 0x00000000
564 #define PLT_PIC12_ENTRY_WORD3 0x0d105810
565 #define PLT_PIC12_ENTRY_WORD4 0x100ea7f4
566
567 #define PLT_PIC16_ENTRY_WORD0 0xa7180000
568 #define PLT_PIC16_ENTRY_WORD1 0x5811c000
569 #define PLT_PIC16_ENTRY_WORD2 0x07f10000
570 #define PLT_PIC16_ENTRY_WORD3 0x0d105810
571 #define PLT_PIC16_ENTRY_WORD4 0x100ea7f4
572
573 #define PLT_ENTRY_WORD0 0x0d105810
574 #define PLT_ENTRY_WORD1 0x10165810
575 #define PLT_ENTRY_WORD2 0x100007f1
576 #define PLT_ENTRY_WORD3 0x0d105810
577 #define PLT_ENTRY_WORD4 0x100ea7f4
578
579 /* The first PLT entry pushes the offset into the symbol table
580 from R1 onto the stack at 8(15) and the loader object info
581 at 12(15), loads the loader address in R1 and jumps to it. */
582
583 /* The first entry in the PLT for PIC code:
584
585 PLT0:
586 ST 1,28(15) # R1 has offset into symbol table
587 L 1,4(12) # Get loader ino(object struct address)
588 ST 1,24(15) # Store address
589 L 1,8(12) # Entry address of loader in R1
590 BR 1 # Jump to loader
591
592 The first entry in the PLT for static code:
593
594 PLT0:
595 ST 1,28(15) # R1 has offset into symbol table
596 BASR 1,0
597 L 1,18(0,1) # Get address of GOT
598 MVC 24(4,15),4(1) # Move loader ino to stack
599 L 1,8(1) # Get address of loader
600 BR 1 # Jump to loader
601 .word 0 # filler
602 .long got # address of GOT */
603
604 #define PLT_PIC_FIRST_ENTRY_WORD0 0x5010f01c
605 #define PLT_PIC_FIRST_ENTRY_WORD1 0x5810c004
606 #define PLT_PIC_FIRST_ENTRY_WORD2 0x5010f018
607 #define PLT_PIC_FIRST_ENTRY_WORD3 0x5810c008
608 #define PLT_PIC_FIRST_ENTRY_WORD4 0x07f10000
609
610 #define PLT_FIRST_ENTRY_WORD0 0x5010f01c
611 #define PLT_FIRST_ENTRY_WORD1 0x0d105810
612 #define PLT_FIRST_ENTRY_WORD2 0x1012D203
613 #define PLT_FIRST_ENTRY_WORD3 0xf0181004
614 #define PLT_FIRST_ENTRY_WORD4 0x58101008
615 #define PLT_FIRST_ENTRY_WORD5 0x07f10000
616
617 /* The s390 linker needs to keep track of the number of relocs that it
618 decides to copy as dynamic relocs in check_relocs for each symbol.
619 This is so that it can later discard them if they are found to be
620 unnecessary. We store the information in a field extending the
621 regular ELF linker hash table. */
622
623 struct elf_s390_dyn_relocs
624 {
625 struct elf_s390_dyn_relocs *next;
626
627 /* The input section of the reloc. */
628 asection *sec;
629
630 /* Total number of relocs copied for the input section. */
631 bfd_size_type count;
632
633 /* Number of pc-relative relocs copied for the input section. */
634 bfd_size_type pc_count;
635 };
636
637 /* s390 ELF linker hash entry. */
638
639 struct elf_s390_link_hash_entry
640 {
641 struct elf_link_hash_entry elf;
642
643 /* Track dynamic relocs copied for this symbol. */
644 struct elf_s390_dyn_relocs *dyn_relocs;
645
646 /* Number of GOTPLT references for a function. */
647 bfd_signed_vma gotplt_refcount;
648
649 #define GOT_UNKNOWN 0
650 #define GOT_NORMAL 1
651 #define GOT_TLS_GD 2
652 #define GOT_TLS_IE 3
653 #define GOT_TLS_IE_NLT 4
654 unsigned char tls_type;
655 };
656
657 #define elf_s390_hash_entry(ent) \
658 ((struct elf_s390_link_hash_entry *)(ent))
659
660 struct elf_s390_obj_tdata
661 {
662 struct elf_obj_tdata root;
663
664 /* tls_type for each local got entry. */
665 char *local_got_tls_type;
666 };
667
668 #define elf_s390_tdata(abfd) \
669 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
670
671 #define elf_s390_local_got_tls_type(abfd) \
672 (elf_s390_tdata (abfd)->local_got_tls_type)
673
674 static bfd_boolean
675 elf_s390_mkobject (abfd)
676 bfd *abfd;
677 {
678 bfd_size_type amt = sizeof (struct elf_s390_obj_tdata);
679 abfd->tdata.any = bfd_zalloc (abfd, amt);
680 if (abfd->tdata.any == NULL)
681 return FALSE;
682 return TRUE;
683 }
684
685 static bfd_boolean
686 elf_s390_object_p (abfd)
687 bfd *abfd;
688 {
689 /* Set the right machine number for an s390 elf32 file. */
690 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31);
691 }
692
693 /* s390 ELF linker hash table. */
694
695 struct elf_s390_link_hash_table
696 {
697 struct elf_link_hash_table elf;
698
699 /* Short-cuts to get to dynamic linker sections. */
700 asection *sgot;
701 asection *sgotplt;
702 asection *srelgot;
703 asection *splt;
704 asection *srelplt;
705 asection *sdynbss;
706 asection *srelbss;
707
708 union {
709 bfd_signed_vma refcount;
710 bfd_vma offset;
711 } tls_ldm_got;
712
713 /* Small local sym to section mapping cache. */
714 struct sym_sec_cache sym_sec;
715 };
716
717 /* Get the s390 ELF linker hash table from a link_info structure. */
718
719 #define elf_s390_hash_table(p) \
720 ((struct elf_s390_link_hash_table *) ((p)->hash))
721
722 /* Create an entry in an s390 ELF linker hash table. */
723
724 static struct bfd_hash_entry *
725 link_hash_newfunc (entry, table, string)
726 struct bfd_hash_entry *entry;
727 struct bfd_hash_table *table;
728 const char *string;
729 {
730 /* Allocate the structure if it has not already been allocated by a
731 subclass. */
732 if (entry == NULL)
733 {
734 entry = bfd_hash_allocate (table,
735 sizeof (struct elf_s390_link_hash_entry));
736 if (entry == NULL)
737 return entry;
738 }
739
740 /* Call the allocation method of the superclass. */
741 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
742 if (entry != NULL)
743 {
744 struct elf_s390_link_hash_entry *eh;
745
746 eh = (struct elf_s390_link_hash_entry *) entry;
747 eh->dyn_relocs = NULL;
748 eh->gotplt_refcount = 0;
749 eh->tls_type = GOT_UNKNOWN;
750 }
751
752 return entry;
753 }
754
755 /* Create an s390 ELF linker hash table. */
756
757 static struct bfd_link_hash_table *
758 elf_s390_link_hash_table_create (abfd)
759 bfd *abfd;
760 {
761 struct elf_s390_link_hash_table *ret;
762 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
763
764 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
765 if (ret == NULL)
766 return NULL;
767
768 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
769 {
770 free (ret);
771 return NULL;
772 }
773
774 ret->sgot = NULL;
775 ret->sgotplt = NULL;
776 ret->srelgot = NULL;
777 ret->splt = NULL;
778 ret->srelplt = NULL;
779 ret->sdynbss = NULL;
780 ret->srelbss = NULL;
781 ret->tls_ldm_got.refcount = 0;
782 ret->sym_sec.abfd = NULL;
783
784 return &ret->elf.root;
785 }
786
787 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
788 shortcuts to them in our hash table. */
789
790 static bfd_boolean
791 create_got_section (dynobj, info)
792 bfd *dynobj;
793 struct bfd_link_info *info;
794 {
795 struct elf_s390_link_hash_table *htab;
796
797 if (! _bfd_elf_create_got_section (dynobj, info))
798 return FALSE;
799
800 htab = elf_s390_hash_table (info);
801 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
802 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
803 if (!htab->sgot || !htab->sgotplt)
804 abort ();
805
806 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got",
807 (SEC_ALLOC | SEC_LOAD
808 | SEC_HAS_CONTENTS
809 | SEC_IN_MEMORY
810 | SEC_LINKER_CREATED
811 | SEC_READONLY));
812 if (htab->srelgot == NULL
813 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
814 return FALSE;
815 return TRUE;
816 }
817
818 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
819 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
820 hash table. */
821
822 static bfd_boolean
823 elf_s390_create_dynamic_sections (dynobj, info)
824 bfd *dynobj;
825 struct bfd_link_info *info;
826 {
827 struct elf_s390_link_hash_table *htab;
828
829 htab = elf_s390_hash_table (info);
830 if (!htab->sgot && !create_got_section (dynobj, info))
831 return FALSE;
832
833 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
834 return FALSE;
835
836 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
837 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
838 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
839 if (!info->shared)
840 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
841
842 if (!htab->splt || !htab->srelplt || !htab->sdynbss
843 || (!info->shared && !htab->srelbss))
844 abort ();
845
846 return TRUE;
847 }
848
849 /* Copy the extra info we tack onto an elf_link_hash_entry. */
850
851 static void
852 elf_s390_copy_indirect_symbol (bed, dir, ind)
853 const struct elf_backend_data *bed;
854 struct elf_link_hash_entry *dir, *ind;
855 {
856 struct elf_s390_link_hash_entry *edir, *eind;
857
858 edir = (struct elf_s390_link_hash_entry *) dir;
859 eind = (struct elf_s390_link_hash_entry *) ind;
860
861 if (eind->dyn_relocs != NULL)
862 {
863 if (edir->dyn_relocs != NULL)
864 {
865 struct elf_s390_dyn_relocs **pp;
866 struct elf_s390_dyn_relocs *p;
867
868 if (ind->root.type == bfd_link_hash_indirect)
869 abort ();
870
871 /* Add reloc counts against the weak sym to the strong sym
872 list. Merge any entries against the same section. */
873 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
874 {
875 struct elf_s390_dyn_relocs *q;
876
877 for (q = edir->dyn_relocs; q != NULL; q = q->next)
878 if (q->sec == p->sec)
879 {
880 q->pc_count += p->pc_count;
881 q->count += p->count;
882 *pp = p->next;
883 break;
884 }
885 if (q == NULL)
886 pp = &p->next;
887 }
888 *pp = edir->dyn_relocs;
889 }
890
891 edir->dyn_relocs = eind->dyn_relocs;
892 eind->dyn_relocs = NULL;
893 }
894
895 if (ind->root.type == bfd_link_hash_indirect
896 && dir->got.refcount <= 0)
897 {
898 edir->tls_type = eind->tls_type;
899 eind->tls_type = GOT_UNKNOWN;
900 }
901
902 if (ELIMINATE_COPY_RELOCS
903 && ind->root.type != bfd_link_hash_indirect
904 && dir->dynamic_adjusted)
905 {
906 /* If called to transfer flags for a weakdef during processing
907 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
908 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
909 dir->ref_dynamic |= ind->ref_dynamic;
910 dir->ref_regular |= ind->ref_regular;
911 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
912 dir->needs_plt |= ind->needs_plt;
913 }
914 else
915 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
916 }
917
918 static int
919 elf_s390_tls_transition (info, r_type, is_local)
920 struct bfd_link_info *info;
921 int r_type;
922 int is_local;
923 {
924 if (info->shared)
925 return r_type;
926
927 switch (r_type)
928 {
929 case R_390_TLS_GD32:
930 case R_390_TLS_IE32:
931 if (is_local)
932 return R_390_TLS_LE32;
933 return R_390_TLS_IE32;
934 case R_390_TLS_GOTIE32:
935 if (is_local)
936 return R_390_TLS_LE32;
937 return R_390_TLS_GOTIE32;
938 case R_390_TLS_LDM32:
939 return R_390_TLS_LE32;
940 }
941
942 return r_type;
943 }
944
945 /* Look through the relocs for a section during the first phase, and
946 allocate space in the global offset table or procedure linkage
947 table. */
948
949 static bfd_boolean
950 elf_s390_check_relocs (abfd, info, sec, relocs)
951 bfd *abfd;
952 struct bfd_link_info *info;
953 asection *sec;
954 const Elf_Internal_Rela *relocs;
955 {
956 struct elf_s390_link_hash_table *htab;
957 Elf_Internal_Shdr *symtab_hdr;
958 struct elf_link_hash_entry **sym_hashes;
959 const Elf_Internal_Rela *rel;
960 const Elf_Internal_Rela *rel_end;
961 asection *sreloc;
962 bfd_signed_vma *local_got_refcounts;
963 int tls_type, old_tls_type;
964
965 if (info->relocatable)
966 return TRUE;
967
968 htab = elf_s390_hash_table (info);
969 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
970 sym_hashes = elf_sym_hashes (abfd);
971 local_got_refcounts = elf_local_got_refcounts (abfd);
972
973 sreloc = NULL;
974
975 rel_end = relocs + sec->reloc_count;
976 for (rel = relocs; rel < rel_end; rel++)
977 {
978 unsigned int r_type;
979 unsigned long r_symndx;
980 struct elf_link_hash_entry *h;
981
982 r_symndx = ELF32_R_SYM (rel->r_info);
983
984 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
985 {
986 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
987 abfd, r_symndx);
988 return FALSE;
989 }
990
991 if (r_symndx < symtab_hdr->sh_info)
992 h = NULL;
993 else
994 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
995
996 /* Create got section and local_got_refcounts array if they
997 are needed. */
998 r_type = elf_s390_tls_transition (info,
999 ELF32_R_TYPE (rel->r_info),
1000 h == NULL);
1001 switch (r_type)
1002 {
1003 case R_390_GOT12:
1004 case R_390_GOT16:
1005 case R_390_GOT20:
1006 case R_390_GOT32:
1007 case R_390_GOTENT:
1008 case R_390_GOTPLT12:
1009 case R_390_GOTPLT16:
1010 case R_390_GOTPLT20:
1011 case R_390_GOTPLT32:
1012 case R_390_GOTPLTENT:
1013 case R_390_TLS_GD32:
1014 case R_390_TLS_GOTIE12:
1015 case R_390_TLS_GOTIE20:
1016 case R_390_TLS_GOTIE32:
1017 case R_390_TLS_IEENT:
1018 case R_390_TLS_IE32:
1019 case R_390_TLS_LDM32:
1020 if (h == NULL
1021 && local_got_refcounts == NULL)
1022 {
1023 bfd_size_type size;
1024
1025 size = symtab_hdr->sh_info;
1026 size *= (sizeof (bfd_signed_vma) + sizeof(char));
1027 local_got_refcounts = ((bfd_signed_vma *)
1028 bfd_zalloc (abfd, size));
1029 if (local_got_refcounts == NULL)
1030 return FALSE;
1031 elf_local_got_refcounts (abfd) = local_got_refcounts;
1032 elf_s390_local_got_tls_type (abfd)
1033 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1034 }
1035 /* Fall through. */
1036 case R_390_GOTOFF16:
1037 case R_390_GOTOFF32:
1038 case R_390_GOTPC:
1039 case R_390_GOTPCDBL:
1040 if (htab->sgot == NULL)
1041 {
1042 if (htab->elf.dynobj == NULL)
1043 htab->elf.dynobj = abfd;
1044 if (!create_got_section (htab->elf.dynobj, info))
1045 return FALSE;
1046 }
1047 }
1048
1049 switch (r_type)
1050 {
1051 case R_390_GOTOFF16:
1052 case R_390_GOTOFF32:
1053 case R_390_GOTPC:
1054 case R_390_GOTPCDBL:
1055 /* Got is created, nothing to be done. */
1056 break;
1057
1058 case R_390_PLT16DBL:
1059 case R_390_PLT32DBL:
1060 case R_390_PLT32:
1061 case R_390_PLTOFF16:
1062 case R_390_PLTOFF32:
1063 /* This symbol requires a procedure linkage table entry. We
1064 actually build the entry in adjust_dynamic_symbol,
1065 because this might be a case of linking PIC code which is
1066 never referenced by a dynamic object, in which case we
1067 don't need to generate a procedure linkage table entry
1068 after all. */
1069
1070 /* If this is a local symbol, we resolve it directly without
1071 creating a procedure linkage table entry. */
1072 if (h != NULL)
1073 {
1074 h->needs_plt = 1;
1075 h->plt.refcount += 1;
1076 }
1077 break;
1078
1079 case R_390_GOTPLT12:
1080 case R_390_GOTPLT16:
1081 case R_390_GOTPLT20:
1082 case R_390_GOTPLT32:
1083 case R_390_GOTPLTENT:
1084 /* This symbol requires either a procedure linkage table entry
1085 or an entry in the local got. We actually build the entry
1086 in adjust_dynamic_symbol because whether this is really a
1087 global reference can change and with it the fact if we have
1088 to create a plt entry or a local got entry. To be able to
1089 make a once global symbol a local one we have to keep track
1090 of the number of gotplt references that exist for this
1091 symbol. */
1092 if (h != NULL)
1093 {
1094 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1095 h->needs_plt = 1;
1096 h->plt.refcount += 1;
1097 }
1098 else
1099 local_got_refcounts[r_symndx] += 1;
1100 break;
1101
1102 case R_390_TLS_LDM32:
1103 htab->tls_ldm_got.refcount += 1;
1104 break;
1105
1106 case R_390_TLS_IE32:
1107 case R_390_TLS_GOTIE12:
1108 case R_390_TLS_GOTIE20:
1109 case R_390_TLS_GOTIE32:
1110 case R_390_TLS_IEENT:
1111 if (info->shared)
1112 info->flags |= DF_STATIC_TLS;
1113 /* Fall through. */
1114
1115 case R_390_GOT12:
1116 case R_390_GOT16:
1117 case R_390_GOT20:
1118 case R_390_GOT32:
1119 case R_390_GOTENT:
1120 case R_390_TLS_GD32:
1121 /* This symbol requires a global offset table entry. */
1122 switch (r_type)
1123 {
1124 default:
1125 case R_390_GOT12:
1126 case R_390_GOT16:
1127 case R_390_GOT20:
1128 case R_390_GOT32:
1129 case R_390_GOTENT:
1130 tls_type = GOT_NORMAL;
1131 break;
1132 case R_390_TLS_GD32:
1133 tls_type = GOT_TLS_GD;
1134 break;
1135 case R_390_TLS_IE32:
1136 case R_390_TLS_GOTIE32:
1137 tls_type = GOT_TLS_IE;
1138 break;
1139 case R_390_TLS_GOTIE12:
1140 case R_390_TLS_GOTIE20:
1141 case R_390_TLS_IEENT:
1142 tls_type = GOT_TLS_IE_NLT;
1143 break;
1144 }
1145
1146 if (h != NULL)
1147 {
1148 h->got.refcount += 1;
1149 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1150 }
1151 else
1152 {
1153 local_got_refcounts[r_symndx] += 1;
1154 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1155 }
1156 /* If a TLS symbol is accessed using IE at least once,
1157 there is no point to use dynamic model for it. */
1158 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1159 {
1160 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1161 {
1162 (*_bfd_error_handler)
1163 (_("%B: `%s' accessed both as normal and thread local symbol"),
1164 abfd, h->root.root.string);
1165 return FALSE;
1166 }
1167 if (old_tls_type > tls_type)
1168 tls_type = old_tls_type;
1169 }
1170
1171 if (old_tls_type != tls_type)
1172 {
1173 if (h != NULL)
1174 elf_s390_hash_entry (h)->tls_type = tls_type;
1175 else
1176 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1177 }
1178
1179 if (r_type != R_390_TLS_IE32)
1180 break;
1181 /* Fall through. */
1182
1183 case R_390_TLS_LE32:
1184 if (!info->shared)
1185 break;
1186 info->flags |= DF_STATIC_TLS;
1187 /* Fall through. */
1188
1189 case R_390_8:
1190 case R_390_16:
1191 case R_390_32:
1192 case R_390_PC16:
1193 case R_390_PC16DBL:
1194 case R_390_PC32DBL:
1195 case R_390_PC32:
1196 if (h != NULL && !info->shared)
1197 {
1198 /* If this reloc is in a read-only section, we might
1199 need a copy reloc. We can't check reliably at this
1200 stage whether the section is read-only, as input
1201 sections have not yet been mapped to output sections.
1202 Tentatively set the flag for now, and correct in
1203 adjust_dynamic_symbol. */
1204 h->non_got_ref = 1;
1205
1206 /* We may need a .plt entry if the function this reloc
1207 refers to is in a shared lib. */
1208 h->plt.refcount += 1;
1209 }
1210
1211 /* If we are creating a shared library, and this is a reloc
1212 against a global symbol, or a non PC relative reloc
1213 against a local symbol, then we need to copy the reloc
1214 into the shared library. However, if we are linking with
1215 -Bsymbolic, we do not need to copy a reloc against a
1216 global symbol which is defined in an object we are
1217 including in the link (i.e., DEF_REGULAR is set). At
1218 this point we have not seen all the input files, so it is
1219 possible that DEF_REGULAR is not set now but will be set
1220 later (it is never cleared). In case of a weak definition,
1221 DEF_REGULAR may be cleared later by a strong definition in
1222 a shared library. We account for that possibility below by
1223 storing information in the relocs_copied field of the hash
1224 table entry. A similar situation occurs when creating
1225 shared libraries and symbol visibility changes render the
1226 symbol local.
1227
1228 If on the other hand, we are creating an executable, we
1229 may need to keep relocations for symbols satisfied by a
1230 dynamic library if we manage to avoid copy relocs for the
1231 symbol. */
1232 if ((info->shared
1233 && (sec->flags & SEC_ALLOC) != 0
1234 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16
1235 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL
1236 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL
1237 && ELF32_R_TYPE (rel->r_info) != R_390_PC32)
1238 || (h != NULL
1239 && (! info->symbolic
1240 || h->root.type == bfd_link_hash_defweak
1241 || !h->def_regular))))
1242 || (ELIMINATE_COPY_RELOCS
1243 && !info->shared
1244 && (sec->flags & SEC_ALLOC) != 0
1245 && h != NULL
1246 && (h->root.type == bfd_link_hash_defweak
1247 || !h->def_regular)))
1248 {
1249 struct elf_s390_dyn_relocs *p;
1250 struct elf_s390_dyn_relocs **head;
1251
1252 /* We must copy these reloc types into the output file.
1253 Create a reloc section in dynobj and make room for
1254 this reloc. */
1255 if (sreloc == NULL)
1256 {
1257 const char *name;
1258 bfd *dynobj;
1259
1260 name = (bfd_elf_string_from_elf_section
1261 (abfd,
1262 elf_elfheader (abfd)->e_shstrndx,
1263 elf_section_data (sec)->rel_hdr.sh_name));
1264 if (name == NULL)
1265 return FALSE;
1266
1267 if (strncmp (name, ".rela", 5) != 0
1268 || strcmp (bfd_get_section_name (abfd, sec),
1269 name + 5) != 0)
1270 {
1271 (*_bfd_error_handler)
1272 (_("%B: bad relocation section name `%s\'"),
1273 abfd, name);
1274 }
1275
1276 if (htab->elf.dynobj == NULL)
1277 htab->elf.dynobj = abfd;
1278
1279 dynobj = htab->elf.dynobj;
1280 sreloc = bfd_get_section_by_name (dynobj, name);
1281 if (sreloc == NULL)
1282 {
1283 flagword flags;
1284
1285 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1286 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1287 if ((sec->flags & SEC_ALLOC) != 0)
1288 flags |= SEC_ALLOC | SEC_LOAD;
1289 sreloc = bfd_make_section_with_flags (dynobj,
1290 name,
1291 flags);
1292 if (sreloc == NULL
1293 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1294 return FALSE;
1295 }
1296 elf_section_data (sec)->sreloc = sreloc;
1297 }
1298
1299 /* If this is a global symbol, we count the number of
1300 relocations we need for this symbol. */
1301 if (h != NULL)
1302 {
1303 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1304 }
1305 else
1306 {
1307 /* Track dynamic relocs needed for local syms too.
1308 We really need local syms available to do this
1309 easily. Oh well. */
1310 asection *s;
1311
1312 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1313 sec, r_symndx);
1314 if (s == NULL)
1315 return FALSE;
1316
1317 head = ((struct elf_s390_dyn_relocs **)
1318 &elf_section_data (s)->local_dynrel);
1319 }
1320
1321 p = *head;
1322 if (p == NULL || p->sec != sec)
1323 {
1324 bfd_size_type amt = sizeof *p;
1325
1326 p = ((struct elf_s390_dyn_relocs *)
1327 bfd_alloc (htab->elf.dynobj, amt));
1328 if (p == NULL)
1329 return FALSE;
1330 p->next = *head;
1331 *head = p;
1332 p->sec = sec;
1333 p->count = 0;
1334 p->pc_count = 0;
1335 }
1336
1337 p->count += 1;
1338 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
1339 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
1340 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
1341 || ELF32_R_TYPE (rel->r_info) == R_390_PC32)
1342 p->pc_count += 1;
1343 }
1344 break;
1345
1346 /* This relocation describes the C++ object vtable hierarchy.
1347 Reconstruct it for later use during GC. */
1348 case R_390_GNU_VTINHERIT:
1349 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1350 return FALSE;
1351 break;
1352
1353 /* This relocation describes which C++ vtable entries are actually
1354 used. Record for later use during GC. */
1355 case R_390_GNU_VTENTRY:
1356 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1357 return FALSE;
1358 break;
1359
1360 default:
1361 break;
1362 }
1363 }
1364
1365 return TRUE;
1366 }
1367
1368 /* Return the section that should be marked against GC for a given
1369 relocation. */
1370
1371 static asection *
1372 elf_s390_gc_mark_hook (sec, info, rel, h, sym)
1373 asection *sec;
1374 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1375 Elf_Internal_Rela *rel;
1376 struct elf_link_hash_entry *h;
1377 Elf_Internal_Sym *sym;
1378 {
1379 if (h != NULL)
1380 {
1381 switch (ELF32_R_TYPE (rel->r_info))
1382 {
1383 case R_390_GNU_VTINHERIT:
1384 case R_390_GNU_VTENTRY:
1385 break;
1386
1387 default:
1388 switch (h->root.type)
1389 {
1390 case bfd_link_hash_defined:
1391 case bfd_link_hash_defweak:
1392 return h->root.u.def.section;
1393
1394 case bfd_link_hash_common:
1395 return h->root.u.c.p->section;
1396
1397 default:
1398 break;
1399 }
1400 }
1401 }
1402 else
1403 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1404
1405 return NULL;
1406 }
1407
1408 /* Update the got entry reference counts for the section being removed. */
1409
1410 static bfd_boolean
1411 elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
1412 bfd *abfd;
1413 struct bfd_link_info *info;
1414 asection *sec;
1415 const Elf_Internal_Rela *relocs;
1416 {
1417 Elf_Internal_Shdr *symtab_hdr;
1418 struct elf_link_hash_entry **sym_hashes;
1419 bfd_signed_vma *local_got_refcounts;
1420 const Elf_Internal_Rela *rel, *relend;
1421
1422 elf_section_data (sec)->local_dynrel = NULL;
1423
1424 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1425 sym_hashes = elf_sym_hashes (abfd);
1426 local_got_refcounts = elf_local_got_refcounts (abfd);
1427
1428 relend = relocs + sec->reloc_count;
1429 for (rel = relocs; rel < relend; rel++)
1430 {
1431 unsigned long r_symndx;
1432 unsigned int r_type;
1433 struct elf_link_hash_entry *h = NULL;
1434
1435 r_symndx = ELF32_R_SYM (rel->r_info);
1436 if (r_symndx >= symtab_hdr->sh_info)
1437 {
1438 struct elf_s390_link_hash_entry *eh;
1439 struct elf_s390_dyn_relocs **pp;
1440 struct elf_s390_dyn_relocs *p;
1441
1442 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1443 while (h->root.type == bfd_link_hash_indirect
1444 || h->root.type == bfd_link_hash_warning)
1445 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1446 eh = (struct elf_s390_link_hash_entry *) h;
1447
1448 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1449 if (p->sec == sec)
1450 {
1451 /* Everything must go for SEC. */
1452 *pp = p->next;
1453 break;
1454 }
1455 }
1456
1457 r_type = ELF32_R_TYPE (rel->r_info);
1458 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1459 switch (r_type)
1460 {
1461 case R_390_TLS_LDM32:
1462 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1463 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1464 break;
1465
1466 case R_390_TLS_GD32:
1467 case R_390_TLS_IE32:
1468 case R_390_TLS_GOTIE12:
1469 case R_390_TLS_GOTIE20:
1470 case R_390_TLS_GOTIE32:
1471 case R_390_TLS_IEENT:
1472 case R_390_GOT12:
1473 case R_390_GOT16:
1474 case R_390_GOT20:
1475 case R_390_GOT32:
1476 case R_390_GOTOFF16:
1477 case R_390_GOTOFF32:
1478 case R_390_GOTPC:
1479 case R_390_GOTPCDBL:
1480 case R_390_GOTENT:
1481 if (h != NULL)
1482 {
1483 if (h->got.refcount > 0)
1484 h->got.refcount -= 1;
1485 }
1486 else if (local_got_refcounts != NULL)
1487 {
1488 if (local_got_refcounts[r_symndx] > 0)
1489 local_got_refcounts[r_symndx] -= 1;
1490 }
1491 break;
1492
1493 case R_390_8:
1494 case R_390_12:
1495 case R_390_16:
1496 case R_390_20:
1497 case R_390_32:
1498 case R_390_PC16:
1499 case R_390_PC16DBL:
1500 case R_390_PC32DBL:
1501 case R_390_PC32:
1502 if (info->shared)
1503 break;
1504 /* Fall through. */
1505
1506 case R_390_PLT16DBL:
1507 case R_390_PLT32DBL:
1508 case R_390_PLT32:
1509 case R_390_PLTOFF16:
1510 case R_390_PLTOFF32:
1511 if (h != NULL)
1512 {
1513 if (h->plt.refcount > 0)
1514 h->plt.refcount -= 1;
1515 }
1516 break;
1517
1518 case R_390_GOTPLT12:
1519 case R_390_GOTPLT16:
1520 case R_390_GOTPLT20:
1521 case R_390_GOTPLT32:
1522 case R_390_GOTPLTENT:
1523 if (h != NULL)
1524 {
1525 if (h->plt.refcount > 0)
1526 {
1527 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1528 h->plt.refcount -= 1;
1529 }
1530 }
1531 else if (local_got_refcounts != NULL)
1532 {
1533 if (local_got_refcounts[r_symndx] > 0)
1534 local_got_refcounts[r_symndx] -= 1;
1535 }
1536 break;
1537
1538 default:
1539 break;
1540 }
1541 }
1542
1543 return TRUE;
1544 }
1545
1546 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1547 entry but we found we will not create any. Called when we find we will
1548 not have any PLT for this symbol, by for example
1549 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1550 or elf_s390_size_dynamic_sections if no dynamic sections will be
1551 created (we're only linking static objects). */
1552
1553 static void
1554 elf_s390_adjust_gotplt (h)
1555 struct elf_s390_link_hash_entry *h;
1556 {
1557 if (h->elf.root.type == bfd_link_hash_warning)
1558 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1559
1560 if (h->gotplt_refcount <= 0)
1561 return;
1562
1563 /* We simply add the number of gotplt references to the number
1564 * of got references for this symbol. */
1565 h->elf.got.refcount += h->gotplt_refcount;
1566 h->gotplt_refcount = -1;
1567 }
1568
1569 /* Adjust a symbol defined by a dynamic object and referenced by a
1570 regular object. The current definition is in some section of the
1571 dynamic object, but we're not including those sections. We have to
1572 change the definition to something the rest of the link can
1573 understand. */
1574
1575 static bfd_boolean
1576 elf_s390_adjust_dynamic_symbol (info, h)
1577 struct bfd_link_info *info;
1578 struct elf_link_hash_entry *h;
1579 {
1580 struct elf_s390_link_hash_table *htab;
1581 asection *s;
1582 unsigned int power_of_two;
1583
1584 /* If this is a function, put it in the procedure linkage table. We
1585 will fill in the contents of the procedure linkage table later
1586 (although we could actually do it here). */
1587 if (h->type == STT_FUNC
1588 || h->needs_plt)
1589 {
1590 if (h->plt.refcount <= 0
1591 || (! info->shared
1592 && !h->def_dynamic
1593 && !h->ref_dynamic
1594 && h->root.type != bfd_link_hash_undefweak
1595 && h->root.type != bfd_link_hash_undefined))
1596 {
1597 /* This case can occur if we saw a PLT32 reloc in an input
1598 file, but the symbol was never referred to by a dynamic
1599 object, or if all references were garbage collected. In
1600 such a case, we don't actually need to build a procedure
1601 linkage table, and we can just do a PC32 reloc instead. */
1602 h->plt.offset = (bfd_vma) -1;
1603 h->needs_plt = 0;
1604 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1605 }
1606
1607 return TRUE;
1608 }
1609 else
1610 /* It's possible that we incorrectly decided a .plt reloc was
1611 needed for an R_390_PC32 reloc to a non-function sym in
1612 check_relocs. We can't decide accurately between function and
1613 non-function syms in check-relocs; Objects loaded later in
1614 the link may change h->type. So fix it now. */
1615 h->plt.offset = (bfd_vma) -1;
1616
1617 /* If this is a weak symbol, and there is a real definition, the
1618 processor independent code will have arranged for us to see the
1619 real definition first, and we can just use the same value. */
1620 if (h->u.weakdef != NULL)
1621 {
1622 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1623 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1624 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1625 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1626 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1627 h->non_got_ref = h->u.weakdef->non_got_ref;
1628 return TRUE;
1629 }
1630
1631 /* This is a reference to a symbol defined by a dynamic object which
1632 is not a function. */
1633
1634 /* If we are creating a shared library, we must presume that the
1635 only references to the symbol are via the global offset table.
1636 For such cases we need not do anything here; the relocations will
1637 be handled correctly by relocate_section. */
1638 if (info->shared)
1639 return TRUE;
1640
1641 /* If there are no references to this symbol that do not use the
1642 GOT, we don't need to generate a copy reloc. */
1643 if (!h->non_got_ref)
1644 return TRUE;
1645
1646 /* If -z nocopyreloc was given, we won't generate them either. */
1647 if (info->nocopyreloc)
1648 {
1649 h->non_got_ref = 0;
1650 return TRUE;
1651 }
1652
1653 if (ELIMINATE_COPY_RELOCS)
1654 {
1655 struct elf_s390_link_hash_entry * eh;
1656 struct elf_s390_dyn_relocs *p;
1657
1658 eh = (struct elf_s390_link_hash_entry *) h;
1659 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1660 {
1661 s = p->sec->output_section;
1662 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1663 break;
1664 }
1665
1666 /* If we didn't find any dynamic relocs in read-only sections, then
1667 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1668 if (p == NULL)
1669 {
1670 h->non_got_ref = 0;
1671 return TRUE;
1672 }
1673 }
1674
1675 /* We must allocate the symbol in our .dynbss section, which will
1676 become part of the .bss section of the executable. There will be
1677 an entry for this symbol in the .dynsym section. The dynamic
1678 object will contain position independent code, so all references
1679 from the dynamic object to this symbol will go through the global
1680 offset table. The dynamic linker will use the .dynsym entry to
1681 determine the address it must put in the global offset table, so
1682 both the dynamic object and the regular object will refer to the
1683 same memory location for the variable. */
1684
1685 htab = elf_s390_hash_table (info);
1686
1687 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1688 copy the initial value out of the dynamic object and into the
1689 runtime process image. */
1690 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1691 {
1692 htab->srelbss->size += sizeof (Elf32_External_Rela);
1693 h->needs_copy = 1;
1694 }
1695
1696 /* We need to figure out the alignment required for this symbol. I
1697 have no idea how ELF linkers handle this. */
1698 power_of_two = bfd_log2 (h->size);
1699 if (power_of_two > 3)
1700 power_of_two = 3;
1701
1702 /* Apply the required alignment. */
1703 s = htab->sdynbss;
1704 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1705 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1706 {
1707 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1708 return FALSE;
1709 }
1710
1711 /* Define the symbol as being at this point in the section. */
1712 h->root.u.def.section = s;
1713 h->root.u.def.value = s->size;
1714
1715 /* Increment the section size to make room for the symbol. */
1716 s->size += h->size;
1717
1718 return TRUE;
1719 }
1720
1721 /* Allocate space in .plt, .got and associated reloc sections for
1722 dynamic relocs. */
1723
1724 static bfd_boolean
1725 allocate_dynrelocs (h, inf)
1726 struct elf_link_hash_entry *h;
1727 PTR inf;
1728 {
1729 struct bfd_link_info *info;
1730 struct elf_s390_link_hash_table *htab;
1731 struct elf_s390_link_hash_entry *eh;
1732 struct elf_s390_dyn_relocs *p;
1733
1734 if (h->root.type == bfd_link_hash_indirect)
1735 return TRUE;
1736
1737 if (h->root.type == bfd_link_hash_warning)
1738 /* When warning symbols are created, they **replace** the "real"
1739 entry in the hash table, thus we never get to see the real
1740 symbol in a hash traversal. So look at it now. */
1741 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1742
1743 info = (struct bfd_link_info *) inf;
1744 htab = elf_s390_hash_table (info);
1745
1746 if (htab->elf.dynamic_sections_created
1747 && h->plt.refcount > 0
1748 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1749 || h->root.type != bfd_link_hash_undefweak))
1750 {
1751 /* Make sure this symbol is output as a dynamic symbol.
1752 Undefined weak syms won't yet be marked as dynamic. */
1753 if (h->dynindx == -1
1754 && !h->forced_local)
1755 {
1756 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1757 return FALSE;
1758 }
1759
1760 if (info->shared
1761 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1762 {
1763 asection *s = htab->splt;
1764
1765 /* If this is the first .plt entry, make room for the special
1766 first entry. */
1767 if (s->size == 0)
1768 s->size += PLT_FIRST_ENTRY_SIZE;
1769
1770 h->plt.offset = s->size;
1771
1772 /* If this symbol is not defined in a regular file, and we are
1773 not generating a shared library, then set the symbol to this
1774 location in the .plt. This is required to make function
1775 pointers compare as equal between the normal executable and
1776 the shared library. */
1777 if (! info->shared
1778 && !h->def_regular)
1779 {
1780 h->root.u.def.section = s;
1781 h->root.u.def.value = h->plt.offset;
1782 }
1783
1784 /* Make room for this entry. */
1785 s->size += PLT_ENTRY_SIZE;
1786
1787 /* We also need to make an entry in the .got.plt section, which
1788 will be placed in the .got section by the linker script. */
1789 htab->sgotplt->size += GOT_ENTRY_SIZE;
1790
1791 /* We also need to make an entry in the .rela.plt section. */
1792 htab->srelplt->size += sizeof (Elf32_External_Rela);
1793 }
1794 else
1795 {
1796 h->plt.offset = (bfd_vma) -1;
1797 h->needs_plt = 0;
1798 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1799 }
1800 }
1801 else
1802 {
1803 h->plt.offset = (bfd_vma) -1;
1804 h->needs_plt = 0;
1805 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1806 }
1807
1808 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to
1809 the binary, we can optimize a bit. IE32 and GOTIE32 get converted
1810 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT
1811 we can save the dynamic TLS relocation. */
1812 if (h->got.refcount > 0
1813 && !info->shared
1814 && h->dynindx == -1
1815 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1816 {
1817 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1818 /* For the GOTIE access without a literal pool entry the offset has
1819 to be stored somewhere. The immediate value in the instruction
1820 is not bit enough so the value is stored in the got. */
1821 {
1822 h->got.offset = htab->sgot->size;
1823 htab->sgot->size += GOT_ENTRY_SIZE;
1824 }
1825 else
1826 h->got.offset = (bfd_vma) -1;
1827 }
1828 else if (h->got.refcount > 0)
1829 {
1830 asection *s;
1831 bfd_boolean dyn;
1832 int tls_type = elf_s390_hash_entry(h)->tls_type;
1833
1834 /* Make sure this symbol is output as a dynamic symbol.
1835 Undefined weak syms won't yet be marked as dynamic. */
1836 if (h->dynindx == -1
1837 && !h->forced_local)
1838 {
1839 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1840 return FALSE;
1841 }
1842
1843 s = htab->sgot;
1844 h->got.offset = s->size;
1845 s->size += GOT_ENTRY_SIZE;
1846 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */
1847 if (tls_type == GOT_TLS_GD)
1848 s->size += GOT_ENTRY_SIZE;
1849 dyn = htab->elf.dynamic_sections_created;
1850 /* R_390_TLS_IE32 needs one dynamic relocation,
1851 R_390_TLS_GD32 needs one if local symbol and two if global. */
1852 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1853 || tls_type >= GOT_TLS_IE)
1854 htab->srelgot->size += sizeof (Elf32_External_Rela);
1855 else if (tls_type == GOT_TLS_GD)
1856 htab->srelgot->size += 2 * sizeof (Elf32_External_Rela);
1857 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1858 || h->root.type != bfd_link_hash_undefweak)
1859 && (info->shared
1860 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1861 htab->srelgot->size += sizeof (Elf32_External_Rela);
1862 }
1863 else
1864 h->got.offset = (bfd_vma) -1;
1865
1866 eh = (struct elf_s390_link_hash_entry *) h;
1867 if (eh->dyn_relocs == NULL)
1868 return TRUE;
1869
1870 /* In the shared -Bsymbolic case, discard space allocated for
1871 dynamic pc-relative relocs against symbols which turn out to be
1872 defined in regular objects. For the normal shared case, discard
1873 space for pc-relative relocs that have become local due to symbol
1874 visibility changes. */
1875
1876 if (info->shared)
1877 {
1878 if (SYMBOL_REFERENCES_LOCAL (info, h))
1879 {
1880 struct elf_s390_dyn_relocs **pp;
1881
1882 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1883 {
1884 p->count -= p->pc_count;
1885 p->pc_count = 0;
1886 if (p->count == 0)
1887 *pp = p->next;
1888 else
1889 pp = &p->next;
1890 }
1891 }
1892
1893 /* Also discard relocs on undefined weak syms with non-default
1894 visibility. */
1895 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1896 && h->root.type == bfd_link_hash_undefweak)
1897 eh->dyn_relocs = NULL;
1898 }
1899 else if (ELIMINATE_COPY_RELOCS)
1900 {
1901 /* For the non-shared case, discard space for relocs against
1902 symbols which turn out to need copy relocs or are not
1903 dynamic. */
1904
1905 if (!h->non_got_ref
1906 && ((h->def_dynamic
1907 && !h->def_regular)
1908 || (htab->elf.dynamic_sections_created
1909 && (h->root.type == bfd_link_hash_undefweak
1910 || h->root.type == bfd_link_hash_undefined))))
1911 {
1912 /* Make sure this symbol is output as a dynamic symbol.
1913 Undefined weak syms won't yet be marked as dynamic. */
1914 if (h->dynindx == -1
1915 && !h->forced_local)
1916 {
1917 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1918 return FALSE;
1919 }
1920
1921 /* If that succeeded, we know we'll be keeping all the
1922 relocs. */
1923 if (h->dynindx != -1)
1924 goto keep;
1925 }
1926
1927 eh->dyn_relocs = NULL;
1928
1929 keep: ;
1930 }
1931
1932 /* Finally, allocate space. */
1933 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1934 {
1935 asection *sreloc = elf_section_data (p->sec)->sreloc;
1936
1937 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1938 }
1939
1940 return TRUE;
1941 }
1942
1943 /* Find any dynamic relocs that apply to read-only sections. */
1944
1945 static bfd_boolean
1946 readonly_dynrelocs (h, inf)
1947 struct elf_link_hash_entry *h;
1948 PTR inf;
1949 {
1950 struct elf_s390_link_hash_entry *eh;
1951 struct elf_s390_dyn_relocs *p;
1952
1953 if (h->root.type == bfd_link_hash_warning)
1954 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1955
1956 eh = (struct elf_s390_link_hash_entry *) h;
1957 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1958 {
1959 asection *s = p->sec->output_section;
1960
1961 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1962 {
1963 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1964
1965 info->flags |= DF_TEXTREL;
1966
1967 /* Not an error, just cut short the traversal. */
1968 return FALSE;
1969 }
1970 }
1971 return TRUE;
1972 }
1973
1974 /* Set the sizes of the dynamic sections. */
1975
1976 static bfd_boolean
1977 elf_s390_size_dynamic_sections (output_bfd, info)
1978 bfd *output_bfd ATTRIBUTE_UNUSED;
1979 struct bfd_link_info *info;
1980 {
1981 struct elf_s390_link_hash_table *htab;
1982 bfd *dynobj;
1983 asection *s;
1984 bfd_boolean relocs;
1985 bfd *ibfd;
1986
1987 htab = elf_s390_hash_table (info);
1988 dynobj = htab->elf.dynobj;
1989 if (dynobj == NULL)
1990 abort ();
1991
1992 if (htab->elf.dynamic_sections_created)
1993 {
1994 /* Set the contents of the .interp section to the interpreter. */
1995 if (info->executable)
1996 {
1997 s = bfd_get_section_by_name (dynobj, ".interp");
1998 if (s == NULL)
1999 abort ();
2000 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2001 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2002 }
2003 }
2004
2005 /* Set up .got offsets for local syms, and space for local dynamic
2006 relocs. */
2007 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2008 {
2009 bfd_signed_vma *local_got;
2010 bfd_signed_vma *end_local_got;
2011 char *local_tls_type;
2012 bfd_size_type locsymcount;
2013 Elf_Internal_Shdr *symtab_hdr;
2014 asection *srela;
2015
2016 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
2017 continue;
2018
2019 for (s = ibfd->sections; s != NULL; s = s->next)
2020 {
2021 struct elf_s390_dyn_relocs *p;
2022
2023 for (p = *((struct elf_s390_dyn_relocs **)
2024 &elf_section_data (s)->local_dynrel);
2025 p != NULL;
2026 p = p->next)
2027 {
2028 if (!bfd_is_abs_section (p->sec)
2029 && bfd_is_abs_section (p->sec->output_section))
2030 {
2031 /* Input section has been discarded, either because
2032 it is a copy of a linkonce section or due to
2033 linker script /DISCARD/, so we'll be discarding
2034 the relocs too. */
2035 }
2036 else if (p->count != 0)
2037 {
2038 srela = elf_section_data (p->sec)->sreloc;
2039 srela->size += p->count * sizeof (Elf32_External_Rela);
2040 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2041 info->flags |= DF_TEXTREL;
2042 }
2043 }
2044 }
2045
2046 local_got = elf_local_got_refcounts (ibfd);
2047 if (!local_got)
2048 continue;
2049
2050 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2051 locsymcount = symtab_hdr->sh_info;
2052 end_local_got = local_got + locsymcount;
2053 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2054 s = htab->sgot;
2055 srela = htab->srelgot;
2056 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2057 {
2058 if (*local_got > 0)
2059 {
2060 *local_got = s->size;
2061 s->size += GOT_ENTRY_SIZE;
2062 if (*local_tls_type == GOT_TLS_GD)
2063 s->size += GOT_ENTRY_SIZE;
2064 if (info->shared)
2065 srela->size += sizeof (Elf32_External_Rela);
2066 }
2067 else
2068 *local_got = (bfd_vma) -1;
2069 }
2070 }
2071
2072 if (htab->tls_ldm_got.refcount > 0)
2073 {
2074 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32
2075 relocs. */
2076 htab->tls_ldm_got.offset = htab->sgot->size;
2077 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2078 htab->srelgot->size += sizeof (Elf32_External_Rela);
2079 }
2080 else
2081 htab->tls_ldm_got.offset = -1;
2082
2083 /* Allocate global sym .plt and .got entries, and space for global
2084 sym dynamic relocs. */
2085 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2086
2087 /* We now have determined the sizes of the various dynamic sections.
2088 Allocate memory for them. */
2089 relocs = FALSE;
2090 for (s = dynobj->sections; s != NULL; s = s->next)
2091 {
2092 if ((s->flags & SEC_LINKER_CREATED) == 0)
2093 continue;
2094
2095 if (s == htab->splt
2096 || s == htab->sgot
2097 || s == htab->sgotplt)
2098 {
2099 /* Strip this section if we don't need it; see the
2100 comment below. */
2101 }
2102 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
2103 {
2104 if (s->size != 0)
2105 relocs = TRUE;
2106
2107 /* We use the reloc_count field as a counter if we need
2108 to copy relocs into the output file. */
2109 s->reloc_count = 0;
2110 }
2111 else
2112 {
2113 /* It's not one of our sections, so don't allocate space. */
2114 continue;
2115 }
2116
2117 if (s->size == 0)
2118 {
2119 /* If we don't need this section, strip it from the
2120 output file. This is to handle .rela.bss and
2121 .rela.plt. We must create it in
2122 create_dynamic_sections, because it must be created
2123 before the linker maps input sections to output
2124 sections. The linker does that before
2125 adjust_dynamic_symbol is called, and it is that
2126 function which decides whether anything needs to go
2127 into these sections. */
2128
2129 s->flags |= SEC_EXCLUDE;
2130 continue;
2131 }
2132
2133 /* Allocate memory for the section contents. We use bfd_zalloc
2134 here in case unused entries are not reclaimed before the
2135 section's contents are written out. This should not happen,
2136 but this way if it does, we get a R_390_NONE reloc instead
2137 of garbage. */
2138 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2139 if (s->contents == NULL)
2140 return FALSE;
2141 }
2142
2143 if (htab->elf.dynamic_sections_created)
2144 {
2145 /* Add some entries to the .dynamic section. We fill in the
2146 values later, in elf_s390_finish_dynamic_sections, but we
2147 must add the entries now so that we get the correct size for
2148 the .dynamic section. The DT_DEBUG entry is filled in by the
2149 dynamic linker and used by the debugger. */
2150 #define add_dynamic_entry(TAG, VAL) \
2151 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2152
2153 if (info->executable)
2154 {
2155 if (!add_dynamic_entry (DT_DEBUG, 0))
2156 return FALSE;
2157 }
2158
2159 if (htab->splt->size != 0)
2160 {
2161 if (!add_dynamic_entry (DT_PLTGOT, 0)
2162 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2163 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2164 || !add_dynamic_entry (DT_JMPREL, 0))
2165 return FALSE;
2166 }
2167
2168 if (relocs)
2169 {
2170 if (!add_dynamic_entry (DT_RELA, 0)
2171 || !add_dynamic_entry (DT_RELASZ, 0)
2172 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2173 return FALSE;
2174
2175 /* If any dynamic relocs apply to a read-only section,
2176 then we need a DT_TEXTREL entry. */
2177 if ((info->flags & DF_TEXTREL) == 0)
2178 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2179 (PTR) info);
2180
2181 if ((info->flags & DF_TEXTREL) != 0)
2182 {
2183 if (!add_dynamic_entry (DT_TEXTREL, 0))
2184 return FALSE;
2185 }
2186 }
2187 }
2188 #undef add_dynamic_entry
2189
2190 return TRUE;
2191 }
2192
2193 /* Return the base VMA address which should be subtracted from real addresses
2194 when resolving @dtpoff relocation.
2195 This is PT_TLS segment p_vaddr. */
2196
2197 static bfd_vma
2198 dtpoff_base (info)
2199 struct bfd_link_info *info;
2200 {
2201 /* If tls_sec is NULL, we should have signalled an error already. */
2202 if (elf_hash_table (info)->tls_sec == NULL)
2203 return 0;
2204 return elf_hash_table (info)->tls_sec->vma;
2205 }
2206
2207 /* Return the relocation value for @tpoff relocation
2208 if STT_TLS virtual address is ADDRESS. */
2209
2210 static bfd_vma
2211 tpoff (info, address)
2212 struct bfd_link_info *info;
2213 bfd_vma address;
2214 {
2215 struct elf_link_hash_table *htab = elf_hash_table (info);
2216
2217 /* If tls_sec is NULL, we should have signalled an error already. */
2218 if (htab->tls_sec == NULL)
2219 return 0;
2220 return htab->tls_size + htab->tls_sec->vma - address;
2221 }
2222
2223 /* Complain if TLS instruction relocation is against an invalid
2224 instruction. */
2225
2226 static void
2227 invalid_tls_insn (input_bfd, input_section, rel)
2228 bfd *input_bfd;
2229 asection *input_section;
2230 Elf_Internal_Rela *rel;
2231 {
2232 reloc_howto_type *howto;
2233
2234 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info);
2235 (*_bfd_error_handler)
2236 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2237 input_bfd,
2238 input_section,
2239 (long) rel->r_offset,
2240 howto->name);
2241 }
2242
2243 /* Relocate a 390 ELF section. */
2244
2245 static bfd_boolean
2246 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2247 contents, relocs, local_syms, local_sections)
2248 bfd *output_bfd;
2249 struct bfd_link_info *info;
2250 bfd *input_bfd;
2251 asection *input_section;
2252 bfd_byte *contents;
2253 Elf_Internal_Rela *relocs;
2254 Elf_Internal_Sym *local_syms;
2255 asection **local_sections;
2256 {
2257 struct elf_s390_link_hash_table *htab;
2258 Elf_Internal_Shdr *symtab_hdr;
2259 struct elf_link_hash_entry **sym_hashes;
2260 bfd_vma *local_got_offsets;
2261 Elf_Internal_Rela *rel;
2262 Elf_Internal_Rela *relend;
2263
2264 if (info->relocatable)
2265 return TRUE;
2266
2267 htab = elf_s390_hash_table (info);
2268 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2269 sym_hashes = elf_sym_hashes (input_bfd);
2270 local_got_offsets = elf_local_got_offsets (input_bfd);
2271
2272 rel = relocs;
2273 relend = relocs + input_section->reloc_count;
2274 for (; rel < relend; rel++)
2275 {
2276 unsigned int r_type;
2277 reloc_howto_type *howto;
2278 unsigned long r_symndx;
2279 struct elf_link_hash_entry *h;
2280 Elf_Internal_Sym *sym;
2281 asection *sec;
2282 bfd_vma off;
2283 bfd_vma relocation;
2284 bfd_boolean unresolved_reloc;
2285 bfd_reloc_status_type r;
2286 int tls_type;
2287
2288 r_type = ELF32_R_TYPE (rel->r_info);
2289 if (r_type == (int) R_390_GNU_VTINHERIT
2290 || r_type == (int) R_390_GNU_VTENTRY)
2291 continue;
2292 if (r_type >= (int) R_390_max)
2293 {
2294 bfd_set_error (bfd_error_bad_value);
2295 return FALSE;
2296 }
2297
2298 howto = elf_howto_table + r_type;
2299 r_symndx = ELF32_R_SYM (rel->r_info);
2300
2301 /* This is a final link. */
2302 h = NULL;
2303 sym = NULL;
2304 sec = NULL;
2305 unresolved_reloc = FALSE;
2306 if (r_symndx < symtab_hdr->sh_info)
2307 {
2308 sym = local_syms + r_symndx;
2309 sec = local_sections[r_symndx];
2310 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2311 }
2312 else
2313 {
2314 bfd_boolean warned ATTRIBUTE_UNUSED;
2315
2316 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2317 r_symndx, symtab_hdr, sym_hashes,
2318 h, sec, relocation,
2319 unresolved_reloc, warned);
2320 }
2321
2322 switch (r_type)
2323 {
2324 case R_390_GOTPLT12:
2325 case R_390_GOTPLT16:
2326 case R_390_GOTPLT20:
2327 case R_390_GOTPLT32:
2328 case R_390_GOTPLTENT:
2329 /* There are three cases for a GOTPLT relocation. 1) The
2330 relocation is against the jump slot entry of a plt that
2331 will get emitted to the output file. 2) The relocation
2332 is against the jump slot of a plt entry that has been
2333 removed. elf_s390_adjust_gotplt has created a GOT entry
2334 as replacement. 3) The relocation is against a local symbol.
2335 Cases 2) and 3) are the same as the GOT relocation code
2336 so we just have to test for case 1 and fall through for
2337 the other two. */
2338 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2339 {
2340 bfd_vma plt_index;
2341
2342 /* Calc. index no.
2343 Current offset - size first entry / entry size. */
2344 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2345 PLT_ENTRY_SIZE;
2346
2347 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2348 addr & GOT addr. */
2349 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2350 unresolved_reloc = FALSE;
2351
2352 if (r_type == R_390_GOTPLTENT)
2353 relocation += htab->sgot->output_section->vma;
2354 break;
2355 }
2356 /* Fall through. */
2357
2358 case R_390_GOT12:
2359 case R_390_GOT16:
2360 case R_390_GOT20:
2361 case R_390_GOT32:
2362 case R_390_GOTENT:
2363 /* Relocation is to the entry for this symbol in the global
2364 offset table. */
2365 if (htab->sgot == NULL)
2366 abort ();
2367
2368 if (h != NULL)
2369 {
2370 bfd_boolean dyn;
2371
2372 off = h->got.offset;
2373 dyn = htab->elf.dynamic_sections_created;
2374 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2375 || (info->shared
2376 && (info->symbolic
2377 || h->dynindx == -1
2378 || h->forced_local)
2379 && h->def_regular)
2380 || (ELF_ST_VISIBILITY (h->other)
2381 && h->root.type == bfd_link_hash_undefweak))
2382 {
2383 /* This is actually a static link, or it is a
2384 -Bsymbolic link and the symbol is defined
2385 locally, or the symbol was forced to be local
2386 because of a version file. We must initialize
2387 this entry in the global offset table. Since the
2388 offset must always be a multiple of 2, we use the
2389 least significant bit to record whether we have
2390 initialized it already.
2391
2392 When doing a dynamic link, we create a .rel.got
2393 relocation entry to initialize the value. This
2394 is done in the finish_dynamic_symbol routine. */
2395 if ((off & 1) != 0)
2396 off &= ~1;
2397 else
2398 {
2399 bfd_put_32 (output_bfd, relocation,
2400 htab->sgot->contents + off);
2401 h->got.offset |= 1;
2402 }
2403 }
2404 else
2405 unresolved_reloc = FALSE;
2406 }
2407 else
2408 {
2409 if (local_got_offsets == NULL)
2410 abort ();
2411
2412 off = local_got_offsets[r_symndx];
2413
2414 /* The offset must always be a multiple of 4. We use
2415 the least significant bit to record whether we have
2416 already generated the necessary reloc. */
2417 if ((off & 1) != 0)
2418 off &= ~1;
2419 else
2420 {
2421 bfd_put_32 (output_bfd, relocation,
2422 htab->sgot->contents + off);
2423
2424 if (info->shared)
2425 {
2426 asection *srelgot;
2427 Elf_Internal_Rela outrel;
2428 bfd_byte *loc;
2429
2430 srelgot = htab->srelgot;
2431 if (srelgot == NULL)
2432 abort ();
2433
2434 outrel.r_offset = (htab->sgot->output_section->vma
2435 + htab->sgot->output_offset
2436 + off);
2437 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2438 outrel.r_addend = relocation;
2439 loc = srelgot->contents;
2440 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
2441 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2442 }
2443
2444 local_got_offsets[r_symndx] |= 1;
2445 }
2446 }
2447
2448 if (off >= (bfd_vma) -2)
2449 abort ();
2450
2451 relocation = htab->sgot->output_offset + off;
2452
2453 /* For @GOTENT the relocation is against the offset between
2454 the instruction and the symbols entry in the GOT and not
2455 between the start of the GOT and the symbols entry. We
2456 add the vma of the GOT to get the correct value. */
2457 if ( r_type == R_390_GOTENT
2458 || r_type == R_390_GOTPLTENT)
2459 relocation += htab->sgot->output_section->vma;
2460
2461 break;
2462
2463 case R_390_GOTOFF16:
2464 case R_390_GOTOFF32:
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_PLT32DBL:
2485 case R_390_PLT32:
2486 /* Relocation is to the entry for this symbol in the
2487 procedure linkage table. */
2488
2489 /* Resolve a PLT32 reloc against a local symbol directly,
2490 without using the procedure linkage table. */
2491 if (h == NULL)
2492 break;
2493
2494 if (h->plt.offset == (bfd_vma) -1
2495 || htab->splt == NULL)
2496 {
2497 /* We didn't make a PLT entry for this symbol. This
2498 happens when statically linking PIC code, or when
2499 using -Bsymbolic. */
2500 break;
2501 }
2502
2503 relocation = (htab->splt->output_section->vma
2504 + htab->splt->output_offset
2505 + h->plt.offset);
2506 unresolved_reloc = FALSE;
2507 break;
2508
2509 case R_390_PLTOFF16:
2510 case R_390_PLTOFF32:
2511 /* Relocation is to the entry for this symbol in the
2512 procedure linkage table relative to the start of the GOT. */
2513
2514 /* For local symbols or if we didn't make a PLT entry for
2515 this symbol resolve the symbol directly. */
2516 if ( h == NULL
2517 || h->plt.offset == (bfd_vma) -1
2518 || htab->splt == NULL)
2519 {
2520 relocation -= htab->sgot->output_section->vma;
2521 break;
2522 }
2523
2524 relocation = (htab->splt->output_section->vma
2525 + htab->splt->output_offset
2526 + h->plt.offset
2527 - htab->sgot->output_section->vma);
2528 unresolved_reloc = FALSE;
2529 break;
2530
2531 case R_390_8:
2532 case R_390_16:
2533 case R_390_32:
2534 case R_390_PC16:
2535 case R_390_PC16DBL:
2536 case R_390_PC32DBL:
2537 case R_390_PC32:
2538 /* r_symndx will be zero only for relocs against symbols
2539 from removed linkonce sections, or sections discarded by
2540 a linker script. */
2541 if (r_symndx == 0
2542 || (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_PC32DBL
2552 && r_type != R_390_PC32)
2553 || (h != NULL
2554 && !SYMBOL_REFERENCES_LOCAL (info, h))))
2555 || (ELIMINATE_COPY_RELOCS
2556 && !info->shared
2557 && h != NULL
2558 && h->dynindx != -1
2559 && !h->non_got_ref
2560 && ((h->def_dynamic
2561 && !h->def_regular)
2562 || h->root.type == bfd_link_hash_undefweak
2563 || h->root.type == bfd_link_hash_undefined)))
2564 {
2565 Elf_Internal_Rela outrel;
2566 bfd_boolean skip, relocate;
2567 asection *sreloc;
2568 bfd_byte *loc;
2569
2570 /* When generating a shared object, these relocations
2571 are copied into the output file to be resolved at run
2572 time. */
2573
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 outrel.r_offset += (input_section->output_section->vma
2585 + input_section->output_offset);
2586
2587 if (skip)
2588 memset (&outrel, 0, sizeof outrel);
2589 else if (h != NULL
2590 && h->dynindx != -1
2591 && (r_type == R_390_PC16
2592 || r_type == R_390_PC16DBL
2593 || r_type == R_390_PC32DBL
2594 || r_type == R_390_PC32
2595 || !info->shared
2596 || !info->symbolic
2597 || !h->def_regular))
2598 {
2599 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2600 outrel.r_addend = rel->r_addend;
2601 }
2602 else
2603 {
2604 /* This symbol is local, or marked to become local. */
2605 outrel.r_addend = relocation + rel->r_addend;
2606 if (r_type == R_390_32)
2607 {
2608 relocate = TRUE;
2609 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2610 }
2611 else
2612 {
2613 long sindx;
2614
2615 if (bfd_is_abs_section (sec))
2616 sindx = 0;
2617 else if (sec == NULL || sec->owner == NULL)
2618 {
2619 bfd_set_error(bfd_error_bad_value);
2620 return FALSE;
2621 }
2622 else
2623 {
2624 asection *osec;
2625
2626 osec = sec->output_section;
2627 sindx = elf_section_data (osec)->dynindx;
2628 BFD_ASSERT (sindx > 0);
2629
2630 /* We are turning this relocation into one
2631 against a section symbol, so subtract out
2632 the output section's address but not the
2633 offset of the input section in the output
2634 section. */
2635
2636 outrel.r_addend -= osec->vma;
2637 }
2638 outrel.r_info = ELF32_R_INFO (sindx, r_type);
2639 }
2640 }
2641
2642 sreloc = elf_section_data (input_section)->sreloc;
2643 if (sreloc == NULL)
2644 abort ();
2645
2646 loc = sreloc->contents;
2647 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2648 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2649
2650 /* If this reloc is against an external symbol, we do
2651 not want to fiddle with the addend. Otherwise, we
2652 need to include the symbol value so that it becomes
2653 an addend for the dynamic reloc. */
2654 if (! relocate)
2655 continue;
2656 }
2657 break;
2658
2659 /* Relocations for tls literal pool entries. */
2660 case R_390_TLS_IE32:
2661 if (info->shared)
2662 {
2663 Elf_Internal_Rela outrel;
2664 asection *sreloc;
2665 bfd_byte *loc;
2666
2667 outrel.r_offset = rel->r_offset
2668 + input_section->output_section->vma
2669 + input_section->output_offset;
2670 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2671 sreloc = elf_section_data (input_section)->sreloc;
2672 if (sreloc == NULL)
2673 abort ();
2674 loc = sreloc->contents;
2675 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2676 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2677 }
2678 /* Fall through. */
2679
2680 case R_390_TLS_GD32:
2681 case R_390_TLS_GOTIE32:
2682 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2683 tls_type = GOT_UNKNOWN;
2684 if (h == NULL && local_got_offsets)
2685 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2686 else if (h != NULL)
2687 {
2688 tls_type = elf_s390_hash_entry(h)->tls_type;
2689 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2690 r_type = R_390_TLS_LE32;
2691 }
2692 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE)
2693 r_type = R_390_TLS_IE32;
2694
2695 if (r_type == R_390_TLS_LE32)
2696 {
2697 /* This relocation gets optimized away by the local exec
2698 access optimization. */
2699 BFD_ASSERT (! unresolved_reloc);
2700 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2701 contents + rel->r_offset);
2702 continue;
2703 }
2704
2705 if (htab->sgot == NULL)
2706 abort ();
2707
2708 if (h != NULL)
2709 off = h->got.offset;
2710 else
2711 {
2712 if (local_got_offsets == NULL)
2713 abort ();
2714
2715 off = local_got_offsets[r_symndx];
2716 }
2717
2718 emit_tls_relocs:
2719
2720 if ((off & 1) != 0)
2721 off &= ~1;
2722 else
2723 {
2724 Elf_Internal_Rela outrel;
2725 bfd_byte *loc;
2726 int dr_type, indx;
2727
2728 if (htab->srelgot == NULL)
2729 abort ();
2730
2731 outrel.r_offset = (htab->sgot->output_section->vma
2732 + htab->sgot->output_offset + off);
2733
2734 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2735 if (r_type == R_390_TLS_GD32)
2736 dr_type = R_390_TLS_DTPMOD;
2737 else
2738 dr_type = R_390_TLS_TPOFF;
2739 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2740 outrel.r_addend = relocation - dtpoff_base (info);
2741 else
2742 outrel.r_addend = 0;
2743 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2744 loc = htab->srelgot->contents;
2745 loc += htab->srelgot->reloc_count++
2746 * sizeof (Elf32_External_Rela);
2747 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2748
2749 if (r_type == R_390_TLS_GD32)
2750 {
2751 if (indx == 0)
2752 {
2753 BFD_ASSERT (! unresolved_reloc);
2754 bfd_put_32 (output_bfd,
2755 relocation - dtpoff_base (info),
2756 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2757 }
2758 else
2759 {
2760 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF);
2761 outrel.r_offset += GOT_ENTRY_SIZE;
2762 outrel.r_addend = 0;
2763 htab->srelgot->reloc_count++;
2764 loc += sizeof (Elf32_External_Rela);
2765 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2766 }
2767 }
2768
2769 if (h != NULL)
2770 h->got.offset |= 1;
2771 else
2772 local_got_offsets[r_symndx] |= 1;
2773 }
2774
2775 if (off >= (bfd_vma) -2)
2776 abort ();
2777 if (r_type == ELF32_R_TYPE (rel->r_info))
2778 {
2779 relocation = htab->sgot->output_offset + off;
2780 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT)
2781 relocation += htab->sgot->output_section->vma;
2782 unresolved_reloc = FALSE;
2783 }
2784 else
2785 {
2786 bfd_put_32 (output_bfd, htab->sgot->output_offset + off,
2787 contents + rel->r_offset);
2788 continue;
2789 }
2790 break;
2791
2792 case R_390_TLS_GOTIE12:
2793 case R_390_TLS_GOTIE20:
2794 case R_390_TLS_IEENT:
2795 if (h == NULL)
2796 {
2797 if (local_got_offsets == NULL)
2798 abort();
2799 off = local_got_offsets[r_symndx];
2800 if (info->shared)
2801 goto emit_tls_relocs;
2802 }
2803 else
2804 {
2805 off = h->got.offset;
2806 tls_type = elf_s390_hash_entry(h)->tls_type;
2807 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2808 goto emit_tls_relocs;
2809 }
2810
2811 if (htab->sgot == NULL)
2812 abort ();
2813
2814 BFD_ASSERT (! unresolved_reloc);
2815 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2816 htab->sgot->contents + off);
2817 relocation = htab->sgot->output_offset + off;
2818 if (r_type == R_390_TLS_IEENT)
2819 relocation += htab->sgot->output_section->vma;
2820 unresolved_reloc = FALSE;
2821 break;
2822
2823 case R_390_TLS_LDM32:
2824 if (! info->shared)
2825 /* The literal pool entry this relocation refers to gets ignored
2826 by the optimized code of the local exec model. Do nothing
2827 and the value will turn out zero. */
2828 continue;
2829
2830 if (htab->sgot == NULL)
2831 abort ();
2832
2833 off = htab->tls_ldm_got.offset;
2834 if (off & 1)
2835 off &= ~1;
2836 else
2837 {
2838 Elf_Internal_Rela outrel;
2839 bfd_byte *loc;
2840
2841 if (htab->srelgot == NULL)
2842 abort ();
2843
2844 outrel.r_offset = (htab->sgot->output_section->vma
2845 + htab->sgot->output_offset + off);
2846
2847 bfd_put_32 (output_bfd, 0,
2848 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2849 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD);
2850 outrel.r_addend = 0;
2851 loc = htab->srelgot->contents;
2852 loc += htab->srelgot->reloc_count++
2853 * sizeof (Elf32_External_Rela);
2854 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2855 htab->tls_ldm_got.offset |= 1;
2856 }
2857 relocation = htab->sgot->output_offset + off;
2858 unresolved_reloc = FALSE;
2859 break;
2860
2861 case R_390_TLS_LE32:
2862 if (info->shared)
2863 {
2864 /* Linking a shared library with non-fpic code requires
2865 a R_390_TLS_TPOFF relocation. */
2866 Elf_Internal_Rela outrel;
2867 asection *sreloc;
2868 bfd_byte *loc;
2869 int indx;
2870
2871 outrel.r_offset = rel->r_offset
2872 + input_section->output_section->vma
2873 + input_section->output_offset;
2874 if (h != NULL && h->dynindx != -1)
2875 indx = h->dynindx;
2876 else
2877 indx = 0;
2878 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF);
2879 if (indx == 0)
2880 outrel.r_addend = relocation - dtpoff_base (info);
2881 else
2882 outrel.r_addend = 0;
2883 sreloc = elf_section_data (input_section)->sreloc;
2884 if (sreloc == NULL)
2885 abort ();
2886 loc = sreloc->contents;
2887 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2888 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2889 }
2890 else
2891 {
2892 BFD_ASSERT (! unresolved_reloc);
2893 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2894 contents + rel->r_offset);
2895 }
2896 continue;
2897
2898 case R_390_TLS_LDO32:
2899 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2900 relocation -= dtpoff_base (info);
2901 else
2902 /* When converting LDO to LE, we must negate. */
2903 relocation = -tpoff (info, relocation);
2904 break;
2905
2906 /* Relocations for tls instructions. */
2907 case R_390_TLS_LOAD:
2908 case R_390_TLS_GDCALL:
2909 case R_390_TLS_LDCALL:
2910 tls_type = GOT_UNKNOWN;
2911 if (h == NULL && local_got_offsets)
2912 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2913 else if (h != NULL)
2914 tls_type = elf_s390_hash_entry(h)->tls_type;
2915
2916 if (tls_type == GOT_TLS_GD)
2917 continue;
2918
2919 if (r_type == R_390_TLS_LOAD)
2920 {
2921 if (!info->shared && (h == NULL || h->dynindx == -1))
2922 {
2923 /* IE->LE transition. Four valid cases:
2924 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0
2925 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0
2926 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0
2927 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2928 unsigned int insn, ry;
2929
2930 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2931 ry = 0;
2932 if ((insn & 0xff00f000) == 0x58000000)
2933 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */
2934 ry = (insn & 0x000f0000);
2935 else if ((insn & 0xff0f0000) == 0x58000000)
2936 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */
2937 ry = (insn & 0x0000f000) << 4;
2938 else if ((insn & 0xff00f000) == 0x5800c000)
2939 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */
2940 ry = (insn & 0x000f0000);
2941 else if ((insn & 0xff0f0000) == 0x580c0000)
2942 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2943 ry = (insn & 0x0000f000) << 4;
2944 else
2945 invalid_tls_insn (input_bfd, input_section, rel);
2946 insn = 0x18000700 | (insn & 0x00f00000) | ry;
2947 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2948 }
2949 }
2950 else if (r_type == R_390_TLS_GDCALL)
2951 {
2952 unsigned int insn;
2953
2954 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2955 if ((insn & 0xff000fff) != 0x4d000000)
2956 invalid_tls_insn (input_bfd, input_section, rel);
2957 if (!info->shared && (h == NULL || h->dynindx == -1))
2958 /* GD->LE transition.
2959 bas %r14,0(%rx,%r13) -> bc 0,0 */
2960 insn = 0x47000000;
2961 else
2962 /* GD->IE transition.
2963 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */
2964 insn = 0x5822c000;
2965 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2966 }
2967 else if (r_type == R_390_TLS_LDCALL)
2968 {
2969 if (!info->shared)
2970 {
2971 unsigned int insn;
2972
2973 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2974 if ((insn & 0xff000fff) != 0x4d000000)
2975 invalid_tls_insn (input_bfd, input_section, rel);
2976 /* LD->LE transition.
2977 bas %r14,0(%rx,%r13) -> bc 0,0 */
2978 insn = 0x47000000;
2979 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2980 }
2981 }
2982 continue;
2983
2984 default:
2985 break;
2986 }
2987
2988 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2989 because such sections are not SEC_ALLOC and thus ld.so will
2990 not process them. */
2991 if (unresolved_reloc
2992 && !((input_section->flags & SEC_DEBUGGING) != 0
2993 && h->def_dynamic))
2994 (*_bfd_error_handler)
2995 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
2996 input_bfd,
2997 input_section,
2998 (long) rel->r_offset,
2999 h->root.root.string);
3000
3001 if (r_type == R_390_20
3002 || r_type == R_390_GOT20
3003 || r_type == R_390_GOTPLT20
3004 || r_type == R_390_TLS_GOTIE20)
3005 {
3006 relocation += rel->r_addend;
3007 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3008 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3009 contents, rel->r_offset,
3010 relocation, 0);
3011 }
3012 else
3013 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3014 contents, rel->r_offset,
3015 relocation, rel->r_addend);
3016
3017 if (r != bfd_reloc_ok)
3018 {
3019 const char *name;
3020
3021 if (h != NULL)
3022 name = h->root.root.string;
3023 else
3024 {
3025 name = bfd_elf_string_from_elf_section (input_bfd,
3026 symtab_hdr->sh_link,
3027 sym->st_name);
3028 if (name == NULL)
3029 return FALSE;
3030 if (*name == '\0')
3031 name = bfd_section_name (input_bfd, sec);
3032 }
3033
3034 if (r == bfd_reloc_overflow)
3035 {
3036
3037 if (! ((*info->callbacks->reloc_overflow)
3038 (info, (h ? &h->root : NULL), name, howto->name,
3039 (bfd_vma) 0, input_bfd, input_section,
3040 rel->r_offset)))
3041 return FALSE;
3042 }
3043 else
3044 {
3045 (*_bfd_error_handler)
3046 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3047 input_bfd, input_section,
3048 (long) rel->r_offset, name, (int) r);
3049 return FALSE;
3050 }
3051 }
3052 }
3053
3054 return TRUE;
3055 }
3056
3057 /* Finish up dynamic symbol handling. We set the contents of various
3058 dynamic sections here. */
3059
3060 static bfd_boolean
3061 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3062 bfd *output_bfd;
3063 struct bfd_link_info *info;
3064 struct elf_link_hash_entry *h;
3065 Elf_Internal_Sym *sym;
3066 {
3067 struct elf_s390_link_hash_table *htab;
3068
3069 htab = elf_s390_hash_table (info);
3070
3071 if (h->plt.offset != (bfd_vma) -1)
3072 {
3073 bfd_vma plt_index;
3074 bfd_vma got_offset;
3075 Elf_Internal_Rela rela;
3076 bfd_byte *loc;
3077 bfd_vma relative_offset;
3078
3079 /* This symbol has an entry in the procedure linkage table. Set
3080 it up. */
3081 if (h->dynindx == -1
3082 || htab->splt == NULL
3083 || htab->sgotplt == NULL
3084 || htab->srelplt == NULL)
3085 abort ();
3086
3087 /* Calc. index no.
3088 Current offset - size first entry / entry size. */
3089 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3090
3091 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
3092 addr & GOT addr. */
3093 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3094
3095 /* S390 uses halfwords for relative branch calc! */
3096 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
3097 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
3098 /* If offset is > 32768, branch to a previous branch
3099 390 can only handle +-64 K jumps. */
3100 if ( -32768 > (int) relative_offset )
3101 relative_offset
3102 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3103
3104 /* Fill in the entry in the procedure linkage table. */
3105 if (!info->shared)
3106 {
3107 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3108 htab->splt->contents + h->plt.offset);
3109 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3110 htab->splt->contents + h->plt.offset + 4);
3111 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3112 htab->splt->contents + h->plt.offset + 8);
3113 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3114 htab->splt->contents + h->plt.offset + 12);
3115 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3116 htab->splt->contents + h->plt.offset + 16);
3117 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3118 htab->splt->contents + h->plt.offset + 20);
3119 bfd_put_32 (output_bfd,
3120 (htab->sgotplt->output_section->vma
3121 + htab->sgotplt->output_offset
3122 + got_offset),
3123 htab->splt->contents + h->plt.offset + 24);
3124 }
3125 else if (got_offset < 4096)
3126 {
3127 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD0 + got_offset,
3128 htab->splt->contents + h->plt.offset);
3129 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD1,
3130 htab->splt->contents + h->plt.offset + 4);
3131 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD2,
3132 htab->splt->contents + h->plt.offset + 8);
3133 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD3,
3134 htab->splt->contents + h->plt.offset + 12);
3135 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD4,
3136 htab->splt->contents + h->plt.offset + 16);
3137 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3138 htab->splt->contents + h->plt.offset + 20);
3139 bfd_put_32 (output_bfd, (bfd_vma) 0,
3140 htab->splt->contents + h->plt.offset + 24);
3141 }
3142 else if (got_offset < 32768)
3143 {
3144 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD0 + got_offset,
3145 htab->splt->contents + h->plt.offset);
3146 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD1,
3147 htab->splt->contents + h->plt.offset + 4);
3148 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD2,
3149 htab->splt->contents + h->plt.offset + 8);
3150 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD3,
3151 htab->splt->contents + h->plt.offset + 12);
3152 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD4,
3153 htab->splt->contents + h->plt.offset + 16);
3154 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3155 htab->splt->contents + h->plt.offset + 20);
3156 bfd_put_32 (output_bfd, (bfd_vma) 0,
3157 htab->splt->contents + h->plt.offset + 24);
3158 }
3159 else
3160 {
3161 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD0,
3162 htab->splt->contents + h->plt.offset);
3163 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD1,
3164 htab->splt->contents + h->plt.offset + 4);
3165 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD2,
3166 htab->splt->contents + h->plt.offset + 8);
3167 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD3,
3168 htab->splt->contents + h->plt.offset + 12);
3169 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD4,
3170 htab->splt->contents + h->plt.offset + 16);
3171 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3172 htab->splt->contents + h->plt.offset + 20);
3173 bfd_put_32 (output_bfd, got_offset,
3174 htab->splt->contents + h->plt.offset + 24);
3175 }
3176 /* Insert offset into reloc. table here. */
3177 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
3178 htab->splt->contents + h->plt.offset + 28);
3179
3180 /* Fill in the entry in the global offset table.
3181 Points to instruction after GOT offset. */
3182 bfd_put_32 (output_bfd,
3183 (htab->splt->output_section->vma
3184 + htab->splt->output_offset
3185 + h->plt.offset
3186 + 12),
3187 htab->sgotplt->contents + got_offset);
3188
3189 /* Fill in the entry in the .rela.plt section. */
3190 rela.r_offset = (htab->sgotplt->output_section->vma
3191 + htab->sgotplt->output_offset
3192 + got_offset);
3193 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3194 rela.r_addend = 0;
3195 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rela);
3196 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3197
3198 if (!h->def_regular)
3199 {
3200 /* Mark the symbol as undefined, rather than as defined in
3201 the .plt section. Leave the value alone. This is a clue
3202 for the dynamic linker, to make function pointer
3203 comparisons work between an application and shared
3204 library. */
3205 sym->st_shndx = SHN_UNDEF;
3206 }
3207 }
3208
3209 if (h->got.offset != (bfd_vma) -1
3210 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3211 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3212 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3213 {
3214 Elf_Internal_Rela rela;
3215 bfd_byte *loc;
3216
3217 /* This symbol has an entry in the global offset table. Set it
3218 up. */
3219
3220 if (htab->sgot == NULL || htab->srelgot == NULL)
3221 abort ();
3222
3223 rela.r_offset = (htab->sgot->output_section->vma
3224 + htab->sgot->output_offset
3225 + (h->got.offset &~ (bfd_vma) 1));
3226
3227 /* If this is a static link, or it is a -Bsymbolic link and the
3228 symbol is defined locally or was forced to be local because
3229 of a version file, we just want to emit a RELATIVE reloc.
3230 The entry in the global offset table will already have been
3231 initialized in the relocate_section function. */
3232 if (info->shared
3233 && (info->symbolic
3234 || h->dynindx == -1
3235 || h->forced_local)
3236 && h->def_regular)
3237 {
3238 BFD_ASSERT((h->got.offset & 1) != 0);
3239 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
3240 rela.r_addend = (h->root.u.def.value
3241 + h->root.u.def.section->output_section->vma
3242 + h->root.u.def.section->output_offset);
3243 }
3244 else
3245 {
3246 BFD_ASSERT((h->got.offset & 1) == 0);
3247 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3248 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
3249 rela.r_addend = 0;
3250 }
3251
3252 loc = htab->srelgot->contents;
3253 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3254 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3255 }
3256
3257 if (h->needs_copy)
3258 {
3259 Elf_Internal_Rela rela;
3260 bfd_byte *loc;
3261
3262 /* This symbols needs a copy reloc. Set it up. */
3263
3264 if (h->dynindx == -1
3265 || (h->root.type != bfd_link_hash_defined
3266 && h->root.type != bfd_link_hash_defweak)
3267 || htab->srelbss == NULL)
3268 abort ();
3269
3270 rela.r_offset = (h->root.u.def.value
3271 + h->root.u.def.section->output_section->vma
3272 + h->root.u.def.section->output_offset);
3273 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
3274 rela.r_addend = 0;
3275 loc = htab->srelbss->contents;
3276 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rela);
3277 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3278 }
3279
3280 /* Mark some specially defined symbols as absolute. */
3281 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3282 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
3283 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
3284 sym->st_shndx = SHN_ABS;
3285
3286 return TRUE;
3287 }
3288
3289 /* Used to decide how to sort relocs in an optimal manner for the
3290 dynamic linker, before writing them out. */
3291
3292 static enum elf_reloc_type_class
3293 elf_s390_reloc_type_class (rela)
3294 const Elf_Internal_Rela *rela;
3295 {
3296 switch ((int) ELF32_R_TYPE (rela->r_info))
3297 {
3298 case R_390_RELATIVE:
3299 return reloc_class_relative;
3300 case R_390_JMP_SLOT:
3301 return reloc_class_plt;
3302 case R_390_COPY:
3303 return reloc_class_copy;
3304 default:
3305 return reloc_class_normal;
3306 }
3307 }
3308
3309 /* Finish up the dynamic sections. */
3310
3311 static bfd_boolean
3312 elf_s390_finish_dynamic_sections (output_bfd, info)
3313 bfd *output_bfd;
3314 struct bfd_link_info *info;
3315 {
3316 struct elf_s390_link_hash_table *htab;
3317 bfd *dynobj;
3318 asection *sdyn;
3319
3320 htab = elf_s390_hash_table (info);
3321 dynobj = htab->elf.dynobj;
3322 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3323
3324 if (htab->elf.dynamic_sections_created)
3325 {
3326 Elf32_External_Dyn *dyncon, *dynconend;
3327
3328 if (sdyn == NULL || htab->sgot == NULL)
3329 abort ();
3330
3331 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3332 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3333 for (; dyncon < dynconend; dyncon++)
3334 {
3335 Elf_Internal_Dyn dyn;
3336 asection *s;
3337
3338 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3339
3340 switch (dyn.d_tag)
3341 {
3342 default:
3343 continue;
3344
3345 case DT_PLTGOT:
3346 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3347 break;
3348
3349 case DT_JMPREL:
3350 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3351 break;
3352
3353 case DT_PLTRELSZ:
3354 s = htab->srelplt->output_section;
3355 dyn.d_un.d_val = s->size;
3356 break;
3357 }
3358
3359 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3360 }
3361
3362 /* Fill in the special first entry in the procedure linkage table. */
3363 if (htab->splt && htab->splt->size > 0)
3364 {
3365 memset (htab->splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
3366 if (info->shared)
3367 {
3368 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD0,
3369 htab->splt->contents );
3370 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD1,
3371 htab->splt->contents +4 );
3372 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD2,
3373 htab->splt->contents +8 );
3374 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD3,
3375 htab->splt->contents +12 );
3376 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD4,
3377 htab->splt->contents +16 );
3378 }
3379 else
3380 {
3381 bfd_put_32 (output_bfd, (bfd_vma)PLT_FIRST_ENTRY_WORD0,
3382 htab->splt->contents );
3383 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3384 htab->splt->contents +4 );
3385 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD2,
3386 htab->splt->contents +8 );
3387 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3388 htab->splt->contents +12 );
3389 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3390 htab->splt->contents +16 );
3391 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3392 htab->splt->contents +20 );
3393 bfd_put_32 (output_bfd,
3394 htab->sgotplt->output_section->vma
3395 + htab->sgotplt->output_offset,
3396 htab->splt->contents + 24);
3397 }
3398 elf_section_data (htab->splt->output_section)
3399 ->this_hdr.sh_entsize = 4;
3400 }
3401
3402 }
3403
3404 if (htab->sgotplt)
3405 {
3406 /* Fill in the first three entries in the global offset table. */
3407 if (htab->sgotplt->size > 0)
3408 {
3409 bfd_put_32 (output_bfd,
3410 (sdyn == NULL ? (bfd_vma) 0
3411 : sdyn->output_section->vma + sdyn->output_offset),
3412 htab->sgotplt->contents);
3413 /* One entry for shared object struct ptr. */
3414 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4);
3415 /* One entry for _dl_runtime_resolve. */
3416 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3417 }
3418
3419 elf_section_data (htab->sgotplt->output_section)
3420 ->this_hdr.sh_entsize = 4;
3421 }
3422 return TRUE;
3423 }
3424
3425 static bfd_boolean
3426 elf_s390_grok_prstatus (abfd, note)
3427 bfd * abfd;
3428 Elf_Internal_Note * note;
3429 {
3430 int offset;
3431 unsigned int size;
3432
3433 switch (note->descsz)
3434 {
3435 default:
3436 return FALSE;
3437
3438 case 224: /* S/390 Linux. */
3439 /* pr_cursig */
3440 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3441
3442 /* pr_pid */
3443 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
3444
3445 /* pr_reg */
3446 offset = 72;
3447 size = 144;
3448 break;
3449 }
3450
3451 /* Make a ".reg/999" section. */
3452 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3453 size, note->descpos + offset);
3454 }
3455
3456 /* Return address for Ith PLT stub in section PLT, for relocation REL
3457 or (bfd_vma) -1 if it should not be included. */
3458
3459 static bfd_vma
3460 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3461 const arelent *rel ATTRIBUTE_UNUSED)
3462 {
3463 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3464 }
3465
3466
3467 #define TARGET_BIG_SYM bfd_elf32_s390_vec
3468 #define TARGET_BIG_NAME "elf32-s390"
3469 #define ELF_ARCH bfd_arch_s390
3470 #define ELF_MACHINE_CODE EM_S390
3471 #define ELF_MACHINE_ALT1 EM_S390_OLD
3472 #define ELF_MAXPAGESIZE 0x1000
3473
3474 #define elf_backend_can_gc_sections 1
3475 #define elf_backend_can_refcount 1
3476 #define elf_backend_want_got_plt 1
3477 #define elf_backend_plt_readonly 1
3478 #define elf_backend_want_plt_sym 0
3479 #define elf_backend_got_header_size 12
3480 #define elf_backend_rela_normal 1
3481
3482 #define elf_info_to_howto elf_s390_info_to_howto
3483
3484 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
3485 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
3486 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3487
3488 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3489 #define elf_backend_check_relocs elf_s390_check_relocs
3490 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3491 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3492 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3493 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3494 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3495 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3496 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3497 #define elf_backend_relocate_section elf_s390_relocate_section
3498 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3499 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3500 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
3501 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3502
3503 #define bfd_elf32_mkobject elf_s390_mkobject
3504 #define elf_backend_object_p elf_s390_object_p
3505
3506 #include "elf32-target.h"
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