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2005-06-20 H.J. Lu <hongjiu.lu@intel.com>
[deliverable/binutils-gdb.git] / bfd / elf32-s390.c
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 {
995 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
996 while (h->root.type == bfd_link_hash_indirect
997 || h->root.type == bfd_link_hash_warning)
998 h = (struct elf_link_hash_entry *) h->root.u.i.link;
999 }
1000
1001 /* Create got section and local_got_refcounts array if they
1002 are needed. */
1003 r_type = elf_s390_tls_transition (info,
1004 ELF32_R_TYPE (rel->r_info),
1005 h == NULL);
1006 switch (r_type)
1007 {
1008 case R_390_GOT12:
1009 case R_390_GOT16:
1010 case R_390_GOT20:
1011 case R_390_GOT32:
1012 case R_390_GOTENT:
1013 case R_390_GOTPLT12:
1014 case R_390_GOTPLT16:
1015 case R_390_GOTPLT20:
1016 case R_390_GOTPLT32:
1017 case R_390_GOTPLTENT:
1018 case R_390_TLS_GD32:
1019 case R_390_TLS_GOTIE12:
1020 case R_390_TLS_GOTIE20:
1021 case R_390_TLS_GOTIE32:
1022 case R_390_TLS_IEENT:
1023 case R_390_TLS_IE32:
1024 case R_390_TLS_LDM32:
1025 if (h == NULL
1026 && local_got_refcounts == NULL)
1027 {
1028 bfd_size_type size;
1029
1030 size = symtab_hdr->sh_info;
1031 size *= (sizeof (bfd_signed_vma) + sizeof(char));
1032 local_got_refcounts = ((bfd_signed_vma *)
1033 bfd_zalloc (abfd, size));
1034 if (local_got_refcounts == NULL)
1035 return FALSE;
1036 elf_local_got_refcounts (abfd) = local_got_refcounts;
1037 elf_s390_local_got_tls_type (abfd)
1038 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1039 }
1040 /* Fall through. */
1041 case R_390_GOTOFF16:
1042 case R_390_GOTOFF32:
1043 case R_390_GOTPC:
1044 case R_390_GOTPCDBL:
1045 if (htab->sgot == NULL)
1046 {
1047 if (htab->elf.dynobj == NULL)
1048 htab->elf.dynobj = abfd;
1049 if (!create_got_section (htab->elf.dynobj, info))
1050 return FALSE;
1051 }
1052 }
1053
1054 switch (r_type)
1055 {
1056 case R_390_GOTOFF16:
1057 case R_390_GOTOFF32:
1058 case R_390_GOTPC:
1059 case R_390_GOTPCDBL:
1060 /* Got is created, nothing to be done. */
1061 break;
1062
1063 case R_390_PLT16DBL:
1064 case R_390_PLT32DBL:
1065 case R_390_PLT32:
1066 case R_390_PLTOFF16:
1067 case R_390_PLTOFF32:
1068 /* This symbol requires a procedure linkage table entry. We
1069 actually build the entry in adjust_dynamic_symbol,
1070 because this might be a case of linking PIC code which is
1071 never referenced by a dynamic object, in which case we
1072 don't need to generate a procedure linkage table entry
1073 after all. */
1074
1075 /* If this is a local symbol, we resolve it directly without
1076 creating a procedure linkage table entry. */
1077 if (h != NULL)
1078 {
1079 h->needs_plt = 1;
1080 h->plt.refcount += 1;
1081 }
1082 break;
1083
1084 case R_390_GOTPLT12:
1085 case R_390_GOTPLT16:
1086 case R_390_GOTPLT20:
1087 case R_390_GOTPLT32:
1088 case R_390_GOTPLTENT:
1089 /* This symbol requires either a procedure linkage table entry
1090 or an entry in the local got. We actually build the entry
1091 in adjust_dynamic_symbol because whether this is really a
1092 global reference can change and with it the fact if we have
1093 to create a plt entry or a local got entry. To be able to
1094 make a once global symbol a local one we have to keep track
1095 of the number of gotplt references that exist for this
1096 symbol. */
1097 if (h != NULL)
1098 {
1099 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1100 h->needs_plt = 1;
1101 h->plt.refcount += 1;
1102 }
1103 else
1104 local_got_refcounts[r_symndx] += 1;
1105 break;
1106
1107 case R_390_TLS_LDM32:
1108 htab->tls_ldm_got.refcount += 1;
1109 break;
1110
1111 case R_390_TLS_IE32:
1112 case R_390_TLS_GOTIE12:
1113 case R_390_TLS_GOTIE20:
1114 case R_390_TLS_GOTIE32:
1115 case R_390_TLS_IEENT:
1116 if (info->shared)
1117 info->flags |= DF_STATIC_TLS;
1118 /* Fall through. */
1119
1120 case R_390_GOT12:
1121 case R_390_GOT16:
1122 case R_390_GOT20:
1123 case R_390_GOT32:
1124 case R_390_GOTENT:
1125 case R_390_TLS_GD32:
1126 /* This symbol requires a global offset table entry. */
1127 switch (r_type)
1128 {
1129 default:
1130 case R_390_GOT12:
1131 case R_390_GOT16:
1132 case R_390_GOT20:
1133 case R_390_GOT32:
1134 case R_390_GOTENT:
1135 tls_type = GOT_NORMAL;
1136 break;
1137 case R_390_TLS_GD32:
1138 tls_type = GOT_TLS_GD;
1139 break;
1140 case R_390_TLS_IE32:
1141 case R_390_TLS_GOTIE32:
1142 tls_type = GOT_TLS_IE;
1143 break;
1144 case R_390_TLS_GOTIE12:
1145 case R_390_TLS_GOTIE20:
1146 case R_390_TLS_IEENT:
1147 tls_type = GOT_TLS_IE_NLT;
1148 break;
1149 }
1150
1151 if (h != NULL)
1152 {
1153 h->got.refcount += 1;
1154 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1155 }
1156 else
1157 {
1158 local_got_refcounts[r_symndx] += 1;
1159 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1160 }
1161 /* If a TLS symbol is accessed using IE at least once,
1162 there is no point to use dynamic model for it. */
1163 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1164 {
1165 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1166 {
1167 (*_bfd_error_handler)
1168 (_("%B: `%s' accessed both as normal and thread local symbol"),
1169 abfd, h->root.root.string);
1170 return FALSE;
1171 }
1172 if (old_tls_type > tls_type)
1173 tls_type = old_tls_type;
1174 }
1175
1176 if (old_tls_type != tls_type)
1177 {
1178 if (h != NULL)
1179 elf_s390_hash_entry (h)->tls_type = tls_type;
1180 else
1181 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1182 }
1183
1184 if (r_type != R_390_TLS_IE32)
1185 break;
1186 /* Fall through. */
1187
1188 case R_390_TLS_LE32:
1189 if (!info->shared)
1190 break;
1191 info->flags |= DF_STATIC_TLS;
1192 /* Fall through. */
1193
1194 case R_390_8:
1195 case R_390_16:
1196 case R_390_32:
1197 case R_390_PC16:
1198 case R_390_PC16DBL:
1199 case R_390_PC32DBL:
1200 case R_390_PC32:
1201 if (h != NULL && !info->shared)
1202 {
1203 /* If this reloc is in a read-only section, we might
1204 need a copy reloc. We can't check reliably at this
1205 stage whether the section is read-only, as input
1206 sections have not yet been mapped to output sections.
1207 Tentatively set the flag for now, and correct in
1208 adjust_dynamic_symbol. */
1209 h->non_got_ref = 1;
1210
1211 /* We may need a .plt entry if the function this reloc
1212 refers to is in a shared lib. */
1213 h->plt.refcount += 1;
1214 }
1215
1216 /* If we are creating a shared library, and this is a reloc
1217 against a global symbol, or a non PC relative reloc
1218 against a local symbol, then we need to copy the reloc
1219 into the shared library. However, if we are linking with
1220 -Bsymbolic, we do not need to copy a reloc against a
1221 global symbol which is defined in an object we are
1222 including in the link (i.e., DEF_REGULAR is set). At
1223 this point we have not seen all the input files, so it is
1224 possible that DEF_REGULAR is not set now but will be set
1225 later (it is never cleared). In case of a weak definition,
1226 DEF_REGULAR may be cleared later by a strong definition in
1227 a shared library. We account for that possibility below by
1228 storing information in the relocs_copied field of the hash
1229 table entry. A similar situation occurs when creating
1230 shared libraries and symbol visibility changes render the
1231 symbol local.
1232
1233 If on the other hand, we are creating an executable, we
1234 may need to keep relocations for symbols satisfied by a
1235 dynamic library if we manage to avoid copy relocs for the
1236 symbol. */
1237 if ((info->shared
1238 && (sec->flags & SEC_ALLOC) != 0
1239 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16
1240 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL
1241 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL
1242 && ELF32_R_TYPE (rel->r_info) != R_390_PC32)
1243 || (h != NULL
1244 && (! info->symbolic
1245 || h->root.type == bfd_link_hash_defweak
1246 || !h->def_regular))))
1247 || (ELIMINATE_COPY_RELOCS
1248 && !info->shared
1249 && (sec->flags & SEC_ALLOC) != 0
1250 && h != NULL
1251 && (h->root.type == bfd_link_hash_defweak
1252 || !h->def_regular)))
1253 {
1254 struct elf_s390_dyn_relocs *p;
1255 struct elf_s390_dyn_relocs **head;
1256
1257 /* We must copy these reloc types into the output file.
1258 Create a reloc section in dynobj and make room for
1259 this reloc. */
1260 if (sreloc == NULL)
1261 {
1262 const char *name;
1263 bfd *dynobj;
1264
1265 name = (bfd_elf_string_from_elf_section
1266 (abfd,
1267 elf_elfheader (abfd)->e_shstrndx,
1268 elf_section_data (sec)->rel_hdr.sh_name));
1269 if (name == NULL)
1270 return FALSE;
1271
1272 if (strncmp (name, ".rela", 5) != 0
1273 || strcmp (bfd_get_section_name (abfd, sec),
1274 name + 5) != 0)
1275 {
1276 (*_bfd_error_handler)
1277 (_("%B: bad relocation section name `%s\'"),
1278 abfd, name);
1279 }
1280
1281 if (htab->elf.dynobj == NULL)
1282 htab->elf.dynobj = abfd;
1283
1284 dynobj = htab->elf.dynobj;
1285 sreloc = bfd_get_section_by_name (dynobj, name);
1286 if (sreloc == NULL)
1287 {
1288 flagword flags;
1289
1290 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1291 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1292 if ((sec->flags & SEC_ALLOC) != 0)
1293 flags |= SEC_ALLOC | SEC_LOAD;
1294 sreloc = bfd_make_section_with_flags (dynobj,
1295 name,
1296 flags);
1297 if (sreloc == NULL
1298 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1299 return FALSE;
1300 }
1301 elf_section_data (sec)->sreloc = sreloc;
1302 }
1303
1304 /* If this is a global symbol, we count the number of
1305 relocations we need for this symbol. */
1306 if (h != NULL)
1307 {
1308 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1309 }
1310 else
1311 {
1312 /* Track dynamic relocs needed for local syms too.
1313 We really need local syms available to do this
1314 easily. Oh well. */
1315 asection *s;
1316
1317 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1318 sec, r_symndx);
1319 if (s == NULL)
1320 return FALSE;
1321
1322 head = ((struct elf_s390_dyn_relocs **)
1323 &elf_section_data (s)->local_dynrel);
1324 }
1325
1326 p = *head;
1327 if (p == NULL || p->sec != sec)
1328 {
1329 bfd_size_type amt = sizeof *p;
1330
1331 p = ((struct elf_s390_dyn_relocs *)
1332 bfd_alloc (htab->elf.dynobj, amt));
1333 if (p == NULL)
1334 return FALSE;
1335 p->next = *head;
1336 *head = p;
1337 p->sec = sec;
1338 p->count = 0;
1339 p->pc_count = 0;
1340 }
1341
1342 p->count += 1;
1343 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
1344 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
1345 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
1346 || ELF32_R_TYPE (rel->r_info) == R_390_PC32)
1347 p->pc_count += 1;
1348 }
1349 break;
1350
1351 /* This relocation describes the C++ object vtable hierarchy.
1352 Reconstruct it for later use during GC. */
1353 case R_390_GNU_VTINHERIT:
1354 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1355 return FALSE;
1356 break;
1357
1358 /* This relocation describes which C++ vtable entries are actually
1359 used. Record for later use during GC. */
1360 case R_390_GNU_VTENTRY:
1361 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1362 return FALSE;
1363 break;
1364
1365 default:
1366 break;
1367 }
1368 }
1369
1370 return TRUE;
1371 }
1372
1373 /* Return the section that should be marked against GC for a given
1374 relocation. */
1375
1376 static asection *
1377 elf_s390_gc_mark_hook (sec, info, rel, h, sym)
1378 asection *sec;
1379 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1380 Elf_Internal_Rela *rel;
1381 struct elf_link_hash_entry *h;
1382 Elf_Internal_Sym *sym;
1383 {
1384 if (h != NULL)
1385 {
1386 switch (ELF32_R_TYPE (rel->r_info))
1387 {
1388 case R_390_GNU_VTINHERIT:
1389 case R_390_GNU_VTENTRY:
1390 break;
1391
1392 default:
1393 switch (h->root.type)
1394 {
1395 case bfd_link_hash_defined:
1396 case bfd_link_hash_defweak:
1397 return h->root.u.def.section;
1398
1399 case bfd_link_hash_common:
1400 return h->root.u.c.p->section;
1401
1402 default:
1403 break;
1404 }
1405 }
1406 }
1407 else
1408 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1409
1410 return NULL;
1411 }
1412
1413 /* Update the got entry reference counts for the section being removed. */
1414
1415 static bfd_boolean
1416 elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
1417 bfd *abfd;
1418 struct bfd_link_info *info;
1419 asection *sec;
1420 const Elf_Internal_Rela *relocs;
1421 {
1422 Elf_Internal_Shdr *symtab_hdr;
1423 struct elf_link_hash_entry **sym_hashes;
1424 bfd_signed_vma *local_got_refcounts;
1425 const Elf_Internal_Rela *rel, *relend;
1426
1427 elf_section_data (sec)->local_dynrel = NULL;
1428
1429 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1430 sym_hashes = elf_sym_hashes (abfd);
1431 local_got_refcounts = elf_local_got_refcounts (abfd);
1432
1433 relend = relocs + sec->reloc_count;
1434 for (rel = relocs; rel < relend; rel++)
1435 {
1436 unsigned long r_symndx;
1437 unsigned int r_type;
1438 struct elf_link_hash_entry *h = NULL;
1439
1440 r_symndx = ELF32_R_SYM (rel->r_info);
1441 if (r_symndx >= symtab_hdr->sh_info)
1442 {
1443 struct elf_s390_link_hash_entry *eh;
1444 struct elf_s390_dyn_relocs **pp;
1445 struct elf_s390_dyn_relocs *p;
1446
1447 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1448 while (h->root.type == bfd_link_hash_indirect
1449 || h->root.type == bfd_link_hash_warning)
1450 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1451 eh = (struct elf_s390_link_hash_entry *) h;
1452
1453 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1454 if (p->sec == sec)
1455 {
1456 /* Everything must go for SEC. */
1457 *pp = p->next;
1458 break;
1459 }
1460 }
1461
1462 r_type = ELF32_R_TYPE (rel->r_info);
1463 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1464 switch (r_type)
1465 {
1466 case R_390_TLS_LDM32:
1467 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1468 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1469 break;
1470
1471 case R_390_TLS_GD32:
1472 case R_390_TLS_IE32:
1473 case R_390_TLS_GOTIE12:
1474 case R_390_TLS_GOTIE20:
1475 case R_390_TLS_GOTIE32:
1476 case R_390_TLS_IEENT:
1477 case R_390_GOT12:
1478 case R_390_GOT16:
1479 case R_390_GOT20:
1480 case R_390_GOT32:
1481 case R_390_GOTOFF16:
1482 case R_390_GOTOFF32:
1483 case R_390_GOTPC:
1484 case R_390_GOTPCDBL:
1485 case R_390_GOTENT:
1486 if (h != NULL)
1487 {
1488 if (h->got.refcount > 0)
1489 h->got.refcount -= 1;
1490 }
1491 else if (local_got_refcounts != NULL)
1492 {
1493 if (local_got_refcounts[r_symndx] > 0)
1494 local_got_refcounts[r_symndx] -= 1;
1495 }
1496 break;
1497
1498 case R_390_8:
1499 case R_390_12:
1500 case R_390_16:
1501 case R_390_20:
1502 case R_390_32:
1503 case R_390_PC16:
1504 case R_390_PC16DBL:
1505 case R_390_PC32DBL:
1506 case R_390_PC32:
1507 if (info->shared)
1508 break;
1509 /* Fall through. */
1510
1511 case R_390_PLT16DBL:
1512 case R_390_PLT32DBL:
1513 case R_390_PLT32:
1514 case R_390_PLTOFF16:
1515 case R_390_PLTOFF32:
1516 if (h != NULL)
1517 {
1518 if (h->plt.refcount > 0)
1519 h->plt.refcount -= 1;
1520 }
1521 break;
1522
1523 case R_390_GOTPLT12:
1524 case R_390_GOTPLT16:
1525 case R_390_GOTPLT20:
1526 case R_390_GOTPLT32:
1527 case R_390_GOTPLTENT:
1528 if (h != NULL)
1529 {
1530 if (h->plt.refcount > 0)
1531 {
1532 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1533 h->plt.refcount -= 1;
1534 }
1535 }
1536 else if (local_got_refcounts != NULL)
1537 {
1538 if (local_got_refcounts[r_symndx] > 0)
1539 local_got_refcounts[r_symndx] -= 1;
1540 }
1541 break;
1542
1543 default:
1544 break;
1545 }
1546 }
1547
1548 return TRUE;
1549 }
1550
1551 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1552 entry but we found we will not create any. Called when we find we will
1553 not have any PLT for this symbol, by for example
1554 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1555 or elf_s390_size_dynamic_sections if no dynamic sections will be
1556 created (we're only linking static objects). */
1557
1558 static void
1559 elf_s390_adjust_gotplt (h)
1560 struct elf_s390_link_hash_entry *h;
1561 {
1562 if (h->elf.root.type == bfd_link_hash_warning)
1563 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1564
1565 if (h->gotplt_refcount <= 0)
1566 return;
1567
1568 /* We simply add the number of gotplt references to the number
1569 * of got references for this symbol. */
1570 h->elf.got.refcount += h->gotplt_refcount;
1571 h->gotplt_refcount = -1;
1572 }
1573
1574 /* Adjust a symbol defined by a dynamic object and referenced by a
1575 regular object. The current definition is in some section of the
1576 dynamic object, but we're not including those sections. We have to
1577 change the definition to something the rest of the link can
1578 understand. */
1579
1580 static bfd_boolean
1581 elf_s390_adjust_dynamic_symbol (info, h)
1582 struct bfd_link_info *info;
1583 struct elf_link_hash_entry *h;
1584 {
1585 struct elf_s390_link_hash_table *htab;
1586 asection *s;
1587 unsigned int power_of_two;
1588
1589 /* If this is a function, put it in the procedure linkage table. We
1590 will fill in the contents of the procedure linkage table later
1591 (although we could actually do it here). */
1592 if (h->type == STT_FUNC
1593 || h->needs_plt)
1594 {
1595 if (h->plt.refcount <= 0
1596 || (! info->shared
1597 && !h->def_dynamic
1598 && !h->ref_dynamic
1599 && h->root.type != bfd_link_hash_undefweak
1600 && h->root.type != bfd_link_hash_undefined))
1601 {
1602 /* This case can occur if we saw a PLT32 reloc in an input
1603 file, but the symbol was never referred to by a dynamic
1604 object, or if all references were garbage collected. In
1605 such a case, we don't actually need to build a procedure
1606 linkage table, and we can just do a PC32 reloc instead. */
1607 h->plt.offset = (bfd_vma) -1;
1608 h->needs_plt = 0;
1609 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1610 }
1611
1612 return TRUE;
1613 }
1614 else
1615 /* It's possible that we incorrectly decided a .plt reloc was
1616 needed for an R_390_PC32 reloc to a non-function sym in
1617 check_relocs. We can't decide accurately between function and
1618 non-function syms in check-relocs; Objects loaded later in
1619 the link may change h->type. So fix it now. */
1620 h->plt.offset = (bfd_vma) -1;
1621
1622 /* If this is a weak symbol, and there is a real definition, the
1623 processor independent code will have arranged for us to see the
1624 real definition first, and we can just use the same value. */
1625 if (h->u.weakdef != NULL)
1626 {
1627 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1628 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1629 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1630 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1631 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1632 h->non_got_ref = h->u.weakdef->non_got_ref;
1633 return TRUE;
1634 }
1635
1636 /* This is a reference to a symbol defined by a dynamic object which
1637 is not a function. */
1638
1639 /* If we are creating a shared library, we must presume that the
1640 only references to the symbol are via the global offset table.
1641 For such cases we need not do anything here; the relocations will
1642 be handled correctly by relocate_section. */
1643 if (info->shared)
1644 return TRUE;
1645
1646 /* If there are no references to this symbol that do not use the
1647 GOT, we don't need to generate a copy reloc. */
1648 if (!h->non_got_ref)
1649 return TRUE;
1650
1651 /* If -z nocopyreloc was given, we won't generate them either. */
1652 if (info->nocopyreloc)
1653 {
1654 h->non_got_ref = 0;
1655 return TRUE;
1656 }
1657
1658 if (ELIMINATE_COPY_RELOCS)
1659 {
1660 struct elf_s390_link_hash_entry * eh;
1661 struct elf_s390_dyn_relocs *p;
1662
1663 eh = (struct elf_s390_link_hash_entry *) h;
1664 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1665 {
1666 s = p->sec->output_section;
1667 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1668 break;
1669 }
1670
1671 /* If we didn't find any dynamic relocs in read-only sections, then
1672 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1673 if (p == NULL)
1674 {
1675 h->non_got_ref = 0;
1676 return TRUE;
1677 }
1678 }
1679
1680 /* We must allocate the symbol in our .dynbss section, which will
1681 become part of the .bss section of the executable. There will be
1682 an entry for this symbol in the .dynsym section. The dynamic
1683 object will contain position independent code, so all references
1684 from the dynamic object to this symbol will go through the global
1685 offset table. The dynamic linker will use the .dynsym entry to
1686 determine the address it must put in the global offset table, so
1687 both the dynamic object and the regular object will refer to the
1688 same memory location for the variable. */
1689
1690 htab = elf_s390_hash_table (info);
1691
1692 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1693 copy the initial value out of the dynamic object and into the
1694 runtime process image. */
1695 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1696 {
1697 htab->srelbss->size += sizeof (Elf32_External_Rela);
1698 h->needs_copy = 1;
1699 }
1700
1701 /* We need to figure out the alignment required for this symbol. I
1702 have no idea how ELF linkers handle this. */
1703 power_of_two = bfd_log2 (h->size);
1704 if (power_of_two > 3)
1705 power_of_two = 3;
1706
1707 /* Apply the required alignment. */
1708 s = htab->sdynbss;
1709 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1710 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1711 {
1712 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1713 return FALSE;
1714 }
1715
1716 /* Define the symbol as being at this point in the section. */
1717 h->root.u.def.section = s;
1718 h->root.u.def.value = s->size;
1719
1720 /* Increment the section size to make room for the symbol. */
1721 s->size += h->size;
1722
1723 return TRUE;
1724 }
1725
1726 /* Allocate space in .plt, .got and associated reloc sections for
1727 dynamic relocs. */
1728
1729 static bfd_boolean
1730 allocate_dynrelocs (h, inf)
1731 struct elf_link_hash_entry *h;
1732 PTR inf;
1733 {
1734 struct bfd_link_info *info;
1735 struct elf_s390_link_hash_table *htab;
1736 struct elf_s390_link_hash_entry *eh;
1737 struct elf_s390_dyn_relocs *p;
1738
1739 if (h->root.type == bfd_link_hash_indirect)
1740 return TRUE;
1741
1742 if (h->root.type == bfd_link_hash_warning)
1743 /* When warning symbols are created, they **replace** the "real"
1744 entry in the hash table, thus we never get to see the real
1745 symbol in a hash traversal. So look at it now. */
1746 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1747
1748 info = (struct bfd_link_info *) inf;
1749 htab = elf_s390_hash_table (info);
1750
1751 if (htab->elf.dynamic_sections_created
1752 && h->plt.refcount > 0
1753 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1754 || h->root.type != bfd_link_hash_undefweak))
1755 {
1756 /* Make sure this symbol is output as a dynamic symbol.
1757 Undefined weak syms won't yet be marked as dynamic. */
1758 if (h->dynindx == -1
1759 && !h->forced_local)
1760 {
1761 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1762 return FALSE;
1763 }
1764
1765 if (info->shared
1766 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1767 {
1768 asection *s = htab->splt;
1769
1770 /* If this is the first .plt entry, make room for the special
1771 first entry. */
1772 if (s->size == 0)
1773 s->size += PLT_FIRST_ENTRY_SIZE;
1774
1775 h->plt.offset = s->size;
1776
1777 /* If this symbol is not defined in a regular file, and we are
1778 not generating a shared library, then set the symbol to this
1779 location in the .plt. This is required to make function
1780 pointers compare as equal between the normal executable and
1781 the shared library. */
1782 if (! info->shared
1783 && !h->def_regular)
1784 {
1785 h->root.u.def.section = s;
1786 h->root.u.def.value = h->plt.offset;
1787 }
1788
1789 /* Make room for this entry. */
1790 s->size += PLT_ENTRY_SIZE;
1791
1792 /* We also need to make an entry in the .got.plt section, which
1793 will be placed in the .got section by the linker script. */
1794 htab->sgotplt->size += GOT_ENTRY_SIZE;
1795
1796 /* We also need to make an entry in the .rela.plt section. */
1797 htab->srelplt->size += sizeof (Elf32_External_Rela);
1798 }
1799 else
1800 {
1801 h->plt.offset = (bfd_vma) -1;
1802 h->needs_plt = 0;
1803 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1804 }
1805 }
1806 else
1807 {
1808 h->plt.offset = (bfd_vma) -1;
1809 h->needs_plt = 0;
1810 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1811 }
1812
1813 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to
1814 the binary, we can optimize a bit. IE32 and GOTIE32 get converted
1815 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT
1816 we can save the dynamic TLS relocation. */
1817 if (h->got.refcount > 0
1818 && !info->shared
1819 && h->dynindx == -1
1820 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1821 {
1822 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1823 /* For the GOTIE access without a literal pool entry the offset has
1824 to be stored somewhere. The immediate value in the instruction
1825 is not bit enough so the value is stored in the got. */
1826 {
1827 h->got.offset = htab->sgot->size;
1828 htab->sgot->size += GOT_ENTRY_SIZE;
1829 }
1830 else
1831 h->got.offset = (bfd_vma) -1;
1832 }
1833 else if (h->got.refcount > 0)
1834 {
1835 asection *s;
1836 bfd_boolean dyn;
1837 int tls_type = elf_s390_hash_entry(h)->tls_type;
1838
1839 /* Make sure this symbol is output as a dynamic symbol.
1840 Undefined weak syms won't yet be marked as dynamic. */
1841 if (h->dynindx == -1
1842 && !h->forced_local)
1843 {
1844 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1845 return FALSE;
1846 }
1847
1848 s = htab->sgot;
1849 h->got.offset = s->size;
1850 s->size += GOT_ENTRY_SIZE;
1851 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */
1852 if (tls_type == GOT_TLS_GD)
1853 s->size += GOT_ENTRY_SIZE;
1854 dyn = htab->elf.dynamic_sections_created;
1855 /* R_390_TLS_IE32 needs one dynamic relocation,
1856 R_390_TLS_GD32 needs one if local symbol and two if global. */
1857 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1858 || tls_type >= GOT_TLS_IE)
1859 htab->srelgot->size += sizeof (Elf32_External_Rela);
1860 else if (tls_type == GOT_TLS_GD)
1861 htab->srelgot->size += 2 * sizeof (Elf32_External_Rela);
1862 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1863 || h->root.type != bfd_link_hash_undefweak)
1864 && (info->shared
1865 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1866 htab->srelgot->size += sizeof (Elf32_External_Rela);
1867 }
1868 else
1869 h->got.offset = (bfd_vma) -1;
1870
1871 eh = (struct elf_s390_link_hash_entry *) h;
1872 if (eh->dyn_relocs == NULL)
1873 return TRUE;
1874
1875 /* In the shared -Bsymbolic case, discard space allocated for
1876 dynamic pc-relative relocs against symbols which turn out to be
1877 defined in regular objects. For the normal shared case, discard
1878 space for pc-relative relocs that have become local due to symbol
1879 visibility changes. */
1880
1881 if (info->shared)
1882 {
1883 if (SYMBOL_REFERENCES_LOCAL (info, h))
1884 {
1885 struct elf_s390_dyn_relocs **pp;
1886
1887 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1888 {
1889 p->count -= p->pc_count;
1890 p->pc_count = 0;
1891 if (p->count == 0)
1892 *pp = p->next;
1893 else
1894 pp = &p->next;
1895 }
1896 }
1897
1898 /* Also discard relocs on undefined weak syms with non-default
1899 visibility. */
1900 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1901 && h->root.type == bfd_link_hash_undefweak)
1902 eh->dyn_relocs = NULL;
1903 }
1904 else if (ELIMINATE_COPY_RELOCS)
1905 {
1906 /* For the non-shared case, discard space for relocs against
1907 symbols which turn out to need copy relocs or are not
1908 dynamic. */
1909
1910 if (!h->non_got_ref
1911 && ((h->def_dynamic
1912 && !h->def_regular)
1913 || (htab->elf.dynamic_sections_created
1914 && (h->root.type == bfd_link_hash_undefweak
1915 || h->root.type == bfd_link_hash_undefined))))
1916 {
1917 /* Make sure this symbol is output as a dynamic symbol.
1918 Undefined weak syms won't yet be marked as dynamic. */
1919 if (h->dynindx == -1
1920 && !h->forced_local)
1921 {
1922 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1923 return FALSE;
1924 }
1925
1926 /* If that succeeded, we know we'll be keeping all the
1927 relocs. */
1928 if (h->dynindx != -1)
1929 goto keep;
1930 }
1931
1932 eh->dyn_relocs = NULL;
1933
1934 keep: ;
1935 }
1936
1937 /* Finally, allocate space. */
1938 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1939 {
1940 asection *sreloc = elf_section_data (p->sec)->sreloc;
1941
1942 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1943 }
1944
1945 return TRUE;
1946 }
1947
1948 /* Find any dynamic relocs that apply to read-only sections. */
1949
1950 static bfd_boolean
1951 readonly_dynrelocs (h, inf)
1952 struct elf_link_hash_entry *h;
1953 PTR inf;
1954 {
1955 struct elf_s390_link_hash_entry *eh;
1956 struct elf_s390_dyn_relocs *p;
1957
1958 if (h->root.type == bfd_link_hash_warning)
1959 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1960
1961 eh = (struct elf_s390_link_hash_entry *) h;
1962 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1963 {
1964 asection *s = p->sec->output_section;
1965
1966 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1967 {
1968 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1969
1970 info->flags |= DF_TEXTREL;
1971
1972 /* Not an error, just cut short the traversal. */
1973 return FALSE;
1974 }
1975 }
1976 return TRUE;
1977 }
1978
1979 /* Set the sizes of the dynamic sections. */
1980
1981 static bfd_boolean
1982 elf_s390_size_dynamic_sections (output_bfd, info)
1983 bfd *output_bfd ATTRIBUTE_UNUSED;
1984 struct bfd_link_info *info;
1985 {
1986 struct elf_s390_link_hash_table *htab;
1987 bfd *dynobj;
1988 asection *s;
1989 bfd_boolean relocs;
1990 bfd *ibfd;
1991
1992 htab = elf_s390_hash_table (info);
1993 dynobj = htab->elf.dynobj;
1994 if (dynobj == NULL)
1995 abort ();
1996
1997 if (htab->elf.dynamic_sections_created)
1998 {
1999 /* Set the contents of the .interp section to the interpreter. */
2000 if (info->executable)
2001 {
2002 s = bfd_get_section_by_name (dynobj, ".interp");
2003 if (s == NULL)
2004 abort ();
2005 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2006 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2007 }
2008 }
2009
2010 /* Set up .got offsets for local syms, and space for local dynamic
2011 relocs. */
2012 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2013 {
2014 bfd_signed_vma *local_got;
2015 bfd_signed_vma *end_local_got;
2016 char *local_tls_type;
2017 bfd_size_type locsymcount;
2018 Elf_Internal_Shdr *symtab_hdr;
2019 asection *srela;
2020
2021 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
2022 continue;
2023
2024 for (s = ibfd->sections; s != NULL; s = s->next)
2025 {
2026 struct elf_s390_dyn_relocs *p;
2027
2028 for (p = *((struct elf_s390_dyn_relocs **)
2029 &elf_section_data (s)->local_dynrel);
2030 p != NULL;
2031 p = p->next)
2032 {
2033 if (!bfd_is_abs_section (p->sec)
2034 && bfd_is_abs_section (p->sec->output_section))
2035 {
2036 /* Input section has been discarded, either because
2037 it is a copy of a linkonce section or due to
2038 linker script /DISCARD/, so we'll be discarding
2039 the relocs too. */
2040 }
2041 else if (p->count != 0)
2042 {
2043 srela = elf_section_data (p->sec)->sreloc;
2044 srela->size += p->count * sizeof (Elf32_External_Rela);
2045 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2046 info->flags |= DF_TEXTREL;
2047 }
2048 }
2049 }
2050
2051 local_got = elf_local_got_refcounts (ibfd);
2052 if (!local_got)
2053 continue;
2054
2055 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2056 locsymcount = symtab_hdr->sh_info;
2057 end_local_got = local_got + locsymcount;
2058 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2059 s = htab->sgot;
2060 srela = htab->srelgot;
2061 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2062 {
2063 if (*local_got > 0)
2064 {
2065 *local_got = s->size;
2066 s->size += GOT_ENTRY_SIZE;
2067 if (*local_tls_type == GOT_TLS_GD)
2068 s->size += GOT_ENTRY_SIZE;
2069 if (info->shared)
2070 srela->size += sizeof (Elf32_External_Rela);
2071 }
2072 else
2073 *local_got = (bfd_vma) -1;
2074 }
2075 }
2076
2077 if (htab->tls_ldm_got.refcount > 0)
2078 {
2079 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32
2080 relocs. */
2081 htab->tls_ldm_got.offset = htab->sgot->size;
2082 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2083 htab->srelgot->size += sizeof (Elf32_External_Rela);
2084 }
2085 else
2086 htab->tls_ldm_got.offset = -1;
2087
2088 /* Allocate global sym .plt and .got entries, and space for global
2089 sym dynamic relocs. */
2090 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2091
2092 /* We now have determined the sizes of the various dynamic sections.
2093 Allocate memory for them. */
2094 relocs = FALSE;
2095 for (s = dynobj->sections; s != NULL; s = s->next)
2096 {
2097 if ((s->flags & SEC_LINKER_CREATED) == 0)
2098 continue;
2099
2100 if (s == htab->splt
2101 || s == htab->sgot
2102 || s == htab->sgotplt)
2103 {
2104 /* Strip this section if we don't need it; see the
2105 comment below. */
2106 }
2107 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
2108 {
2109 if (s->size != 0)
2110 relocs = TRUE;
2111
2112 /* We use the reloc_count field as a counter if we need
2113 to copy relocs into the output file. */
2114 s->reloc_count = 0;
2115 }
2116 else
2117 {
2118 /* It's not one of our sections, so don't allocate space. */
2119 continue;
2120 }
2121
2122 if (s->size == 0)
2123 {
2124 /* If we don't need this section, strip it from the
2125 output file. This is to handle .rela.bss and
2126 .rela.plt. We must create it in
2127 create_dynamic_sections, because it must be created
2128 before the linker maps input sections to output
2129 sections. The linker does that before
2130 adjust_dynamic_symbol is called, and it is that
2131 function which decides whether anything needs to go
2132 into these sections. */
2133
2134 s->flags |= SEC_EXCLUDE;
2135 continue;
2136 }
2137
2138 /* Allocate memory for the section contents. We use bfd_zalloc
2139 here in case unused entries are not reclaimed before the
2140 section's contents are written out. This should not happen,
2141 but this way if it does, we get a R_390_NONE reloc instead
2142 of garbage. */
2143 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2144 if (s->contents == NULL)
2145 return FALSE;
2146 }
2147
2148 if (htab->elf.dynamic_sections_created)
2149 {
2150 /* Add some entries to the .dynamic section. We fill in the
2151 values later, in elf_s390_finish_dynamic_sections, but we
2152 must add the entries now so that we get the correct size for
2153 the .dynamic section. The DT_DEBUG entry is filled in by the
2154 dynamic linker and used by the debugger. */
2155 #define add_dynamic_entry(TAG, VAL) \
2156 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2157
2158 if (info->executable)
2159 {
2160 if (!add_dynamic_entry (DT_DEBUG, 0))
2161 return FALSE;
2162 }
2163
2164 if (htab->splt->size != 0)
2165 {
2166 if (!add_dynamic_entry (DT_PLTGOT, 0)
2167 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2168 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2169 || !add_dynamic_entry (DT_JMPREL, 0))
2170 return FALSE;
2171 }
2172
2173 if (relocs)
2174 {
2175 if (!add_dynamic_entry (DT_RELA, 0)
2176 || !add_dynamic_entry (DT_RELASZ, 0)
2177 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2178 return FALSE;
2179
2180 /* If any dynamic relocs apply to a read-only section,
2181 then we need a DT_TEXTREL entry. */
2182 if ((info->flags & DF_TEXTREL) == 0)
2183 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2184 (PTR) info);
2185
2186 if ((info->flags & DF_TEXTREL) != 0)
2187 {
2188 if (!add_dynamic_entry (DT_TEXTREL, 0))
2189 return FALSE;
2190 }
2191 }
2192 }
2193 #undef add_dynamic_entry
2194
2195 return TRUE;
2196 }
2197
2198 /* Return the base VMA address which should be subtracted from real addresses
2199 when resolving @dtpoff relocation.
2200 This is PT_TLS segment p_vaddr. */
2201
2202 static bfd_vma
2203 dtpoff_base (info)
2204 struct bfd_link_info *info;
2205 {
2206 /* If tls_sec is NULL, we should have signalled an error already. */
2207 if (elf_hash_table (info)->tls_sec == NULL)
2208 return 0;
2209 return elf_hash_table (info)->tls_sec->vma;
2210 }
2211
2212 /* Return the relocation value for @tpoff relocation
2213 if STT_TLS virtual address is ADDRESS. */
2214
2215 static bfd_vma
2216 tpoff (info, address)
2217 struct bfd_link_info *info;
2218 bfd_vma address;
2219 {
2220 struct elf_link_hash_table *htab = elf_hash_table (info);
2221
2222 /* If tls_sec is NULL, we should have signalled an error already. */
2223 if (htab->tls_sec == NULL)
2224 return 0;
2225 return htab->tls_size + htab->tls_sec->vma - address;
2226 }
2227
2228 /* Complain if TLS instruction relocation is against an invalid
2229 instruction. */
2230
2231 static void
2232 invalid_tls_insn (input_bfd, input_section, rel)
2233 bfd *input_bfd;
2234 asection *input_section;
2235 Elf_Internal_Rela *rel;
2236 {
2237 reloc_howto_type *howto;
2238
2239 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info);
2240 (*_bfd_error_handler)
2241 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2242 input_bfd,
2243 input_section,
2244 (long) rel->r_offset,
2245 howto->name);
2246 }
2247
2248 /* Relocate a 390 ELF section. */
2249
2250 static bfd_boolean
2251 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2252 contents, relocs, local_syms, local_sections)
2253 bfd *output_bfd;
2254 struct bfd_link_info *info;
2255 bfd *input_bfd;
2256 asection *input_section;
2257 bfd_byte *contents;
2258 Elf_Internal_Rela *relocs;
2259 Elf_Internal_Sym *local_syms;
2260 asection **local_sections;
2261 {
2262 struct elf_s390_link_hash_table *htab;
2263 Elf_Internal_Shdr *symtab_hdr;
2264 struct elf_link_hash_entry **sym_hashes;
2265 bfd_vma *local_got_offsets;
2266 Elf_Internal_Rela *rel;
2267 Elf_Internal_Rela *relend;
2268
2269 if (info->relocatable)
2270 return TRUE;
2271
2272 htab = elf_s390_hash_table (info);
2273 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2274 sym_hashes = elf_sym_hashes (input_bfd);
2275 local_got_offsets = elf_local_got_offsets (input_bfd);
2276
2277 rel = relocs;
2278 relend = relocs + input_section->reloc_count;
2279 for (; rel < relend; rel++)
2280 {
2281 unsigned int r_type;
2282 reloc_howto_type *howto;
2283 unsigned long r_symndx;
2284 struct elf_link_hash_entry *h;
2285 Elf_Internal_Sym *sym;
2286 asection *sec;
2287 bfd_vma off;
2288 bfd_vma relocation;
2289 bfd_boolean unresolved_reloc;
2290 bfd_reloc_status_type r;
2291 int tls_type;
2292
2293 r_type = ELF32_R_TYPE (rel->r_info);
2294 if (r_type == (int) R_390_GNU_VTINHERIT
2295 || r_type == (int) R_390_GNU_VTENTRY)
2296 continue;
2297 if (r_type >= (int) R_390_max)
2298 {
2299 bfd_set_error (bfd_error_bad_value);
2300 return FALSE;
2301 }
2302
2303 howto = elf_howto_table + r_type;
2304 r_symndx = ELF32_R_SYM (rel->r_info);
2305
2306 /* This is a final link. */
2307 h = NULL;
2308 sym = NULL;
2309 sec = NULL;
2310 unresolved_reloc = FALSE;
2311 if (r_symndx < symtab_hdr->sh_info)
2312 {
2313 sym = local_syms + r_symndx;
2314 sec = local_sections[r_symndx];
2315 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2316 }
2317 else
2318 {
2319 bfd_boolean warned ATTRIBUTE_UNUSED;
2320
2321 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2322 r_symndx, symtab_hdr, sym_hashes,
2323 h, sec, relocation,
2324 unresolved_reloc, warned);
2325 }
2326
2327 switch (r_type)
2328 {
2329 case R_390_GOTPLT12:
2330 case R_390_GOTPLT16:
2331 case R_390_GOTPLT20:
2332 case R_390_GOTPLT32:
2333 case R_390_GOTPLTENT:
2334 /* There are three cases for a GOTPLT relocation. 1) The
2335 relocation is against the jump slot entry of a plt that
2336 will get emitted to the output file. 2) The relocation
2337 is against the jump slot of a plt entry that has been
2338 removed. elf_s390_adjust_gotplt has created a GOT entry
2339 as replacement. 3) The relocation is against a local symbol.
2340 Cases 2) and 3) are the same as the GOT relocation code
2341 so we just have to test for case 1 and fall through for
2342 the other two. */
2343 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2344 {
2345 bfd_vma plt_index;
2346
2347 /* Calc. index no.
2348 Current offset - size first entry / entry size. */
2349 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2350 PLT_ENTRY_SIZE;
2351
2352 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2353 addr & GOT addr. */
2354 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2355 unresolved_reloc = FALSE;
2356
2357 if (r_type == R_390_GOTPLTENT)
2358 relocation += htab->sgot->output_section->vma;
2359 break;
2360 }
2361 /* Fall through. */
2362
2363 case R_390_GOT12:
2364 case R_390_GOT16:
2365 case R_390_GOT20:
2366 case R_390_GOT32:
2367 case R_390_GOTENT:
2368 /* Relocation is to the entry for this symbol in the global
2369 offset table. */
2370 if (htab->sgot == NULL)
2371 abort ();
2372
2373 if (h != NULL)
2374 {
2375 bfd_boolean dyn;
2376
2377 off = h->got.offset;
2378 dyn = htab->elf.dynamic_sections_created;
2379 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2380 || (info->shared
2381 && (info->symbolic
2382 || h->dynindx == -1
2383 || h->forced_local)
2384 && h->def_regular)
2385 || (ELF_ST_VISIBILITY (h->other)
2386 && h->root.type == bfd_link_hash_undefweak))
2387 {
2388 /* This is actually a static link, or it is a
2389 -Bsymbolic link and the symbol is defined
2390 locally, or the symbol was forced to be local
2391 because of a version file. We must initialize
2392 this entry in the global offset table. Since the
2393 offset must always be a multiple of 2, we use the
2394 least significant bit to record whether we have
2395 initialized it already.
2396
2397 When doing a dynamic link, we create a .rel.got
2398 relocation entry to initialize the value. This
2399 is done in the finish_dynamic_symbol routine. */
2400 if ((off & 1) != 0)
2401 off &= ~1;
2402 else
2403 {
2404 bfd_put_32 (output_bfd, relocation,
2405 htab->sgot->contents + off);
2406 h->got.offset |= 1;
2407 }
2408 }
2409 else
2410 unresolved_reloc = FALSE;
2411 }
2412 else
2413 {
2414 if (local_got_offsets == NULL)
2415 abort ();
2416
2417 off = local_got_offsets[r_symndx];
2418
2419 /* The offset must always be a multiple of 4. We use
2420 the least significant bit to record whether we have
2421 already generated the necessary reloc. */
2422 if ((off & 1) != 0)
2423 off &= ~1;
2424 else
2425 {
2426 bfd_put_32 (output_bfd, relocation,
2427 htab->sgot->contents + off);
2428
2429 if (info->shared)
2430 {
2431 asection *srelgot;
2432 Elf_Internal_Rela outrel;
2433 bfd_byte *loc;
2434
2435 srelgot = htab->srelgot;
2436 if (srelgot == NULL)
2437 abort ();
2438
2439 outrel.r_offset = (htab->sgot->output_section->vma
2440 + htab->sgot->output_offset
2441 + off);
2442 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2443 outrel.r_addend = relocation;
2444 loc = srelgot->contents;
2445 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
2446 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2447 }
2448
2449 local_got_offsets[r_symndx] |= 1;
2450 }
2451 }
2452
2453 if (off >= (bfd_vma) -2)
2454 abort ();
2455
2456 relocation = htab->sgot->output_offset + off;
2457
2458 /* For @GOTENT the relocation is against the offset between
2459 the instruction and the symbols entry in the GOT and not
2460 between the start of the GOT and the symbols entry. We
2461 add the vma of the GOT to get the correct value. */
2462 if ( r_type == R_390_GOTENT
2463 || r_type == R_390_GOTPLTENT)
2464 relocation += htab->sgot->output_section->vma;
2465
2466 break;
2467
2468 case R_390_GOTOFF16:
2469 case R_390_GOTOFF32:
2470 /* Relocation is relative to the start of the global offset
2471 table. */
2472
2473 /* Note that sgot->output_offset is not involved in this
2474 calculation. We always want the start of .got. If we
2475 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2476 permitted by the ABI, we might have to change this
2477 calculation. */
2478 relocation -= htab->sgot->output_section->vma;
2479 break;
2480
2481 case R_390_GOTPC:
2482 case R_390_GOTPCDBL:
2483 /* Use global offset table as symbol value. */
2484 relocation = htab->sgot->output_section->vma;
2485 unresolved_reloc = FALSE;
2486 break;
2487
2488 case R_390_PLT16DBL:
2489 case R_390_PLT32DBL:
2490 case R_390_PLT32:
2491 /* Relocation is to the entry for this symbol in the
2492 procedure linkage table. */
2493
2494 /* Resolve a PLT32 reloc against a local symbol directly,
2495 without using the procedure linkage table. */
2496 if (h == NULL)
2497 break;
2498
2499 if (h->plt.offset == (bfd_vma) -1
2500 || htab->splt == NULL)
2501 {
2502 /* We didn't make a PLT entry for this symbol. This
2503 happens when statically linking PIC code, or when
2504 using -Bsymbolic. */
2505 break;
2506 }
2507
2508 relocation = (htab->splt->output_section->vma
2509 + htab->splt->output_offset
2510 + h->plt.offset);
2511 unresolved_reloc = FALSE;
2512 break;
2513
2514 case R_390_PLTOFF16:
2515 case R_390_PLTOFF32:
2516 /* Relocation is to the entry for this symbol in the
2517 procedure linkage table relative to the start of the GOT. */
2518
2519 /* For local symbols or if we didn't make a PLT entry for
2520 this symbol resolve the symbol directly. */
2521 if ( h == NULL
2522 || h->plt.offset == (bfd_vma) -1
2523 || htab->splt == NULL)
2524 {
2525 relocation -= htab->sgot->output_section->vma;
2526 break;
2527 }
2528
2529 relocation = (htab->splt->output_section->vma
2530 + htab->splt->output_offset
2531 + h->plt.offset
2532 - htab->sgot->output_section->vma);
2533 unresolved_reloc = FALSE;
2534 break;
2535
2536 case R_390_8:
2537 case R_390_16:
2538 case R_390_32:
2539 case R_390_PC16:
2540 case R_390_PC16DBL:
2541 case R_390_PC32DBL:
2542 case R_390_PC32:
2543 /* r_symndx will be zero only for relocs against symbols
2544 from removed linkonce sections, or sections discarded by
2545 a linker script. */
2546 if (r_symndx == 0
2547 || (input_section->flags & SEC_ALLOC) == 0)
2548 break;
2549
2550 if ((info->shared
2551 && (h == NULL
2552 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2553 || h->root.type != bfd_link_hash_undefweak)
2554 && ((r_type != R_390_PC16
2555 && r_type != R_390_PC16DBL
2556 && r_type != R_390_PC32DBL
2557 && r_type != R_390_PC32)
2558 || (h != NULL
2559 && !SYMBOL_REFERENCES_LOCAL (info, h))))
2560 || (ELIMINATE_COPY_RELOCS
2561 && !info->shared
2562 && h != NULL
2563 && h->dynindx != -1
2564 && !h->non_got_ref
2565 && ((h->def_dynamic
2566 && !h->def_regular)
2567 || h->root.type == bfd_link_hash_undefweak
2568 || h->root.type == bfd_link_hash_undefined)))
2569 {
2570 Elf_Internal_Rela outrel;
2571 bfd_boolean skip, relocate;
2572 asection *sreloc;
2573 bfd_byte *loc;
2574
2575 /* When generating a shared object, these relocations
2576 are copied into the output file to be resolved at run
2577 time. */
2578
2579 skip = FALSE;
2580 relocate = FALSE;
2581
2582 outrel.r_offset =
2583 _bfd_elf_section_offset (output_bfd, info, input_section,
2584 rel->r_offset);
2585 if (outrel.r_offset == (bfd_vma) -1)
2586 skip = TRUE;
2587 else if (outrel.r_offset == (bfd_vma) -2)
2588 skip = TRUE, relocate = TRUE;
2589 outrel.r_offset += (input_section->output_section->vma
2590 + input_section->output_offset);
2591
2592 if (skip)
2593 memset (&outrel, 0, sizeof outrel);
2594 else if (h != NULL
2595 && h->dynindx != -1
2596 && (r_type == R_390_PC16
2597 || r_type == R_390_PC16DBL
2598 || r_type == R_390_PC32DBL
2599 || r_type == R_390_PC32
2600 || !info->shared
2601 || !info->symbolic
2602 || !h->def_regular))
2603 {
2604 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2605 outrel.r_addend = rel->r_addend;
2606 }
2607 else
2608 {
2609 /* This symbol is local, or marked to become local. */
2610 outrel.r_addend = relocation + rel->r_addend;
2611 if (r_type == R_390_32)
2612 {
2613 relocate = TRUE;
2614 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2615 }
2616 else
2617 {
2618 long sindx;
2619
2620 if (bfd_is_abs_section (sec))
2621 sindx = 0;
2622 else if (sec == NULL || sec->owner == NULL)
2623 {
2624 bfd_set_error(bfd_error_bad_value);
2625 return FALSE;
2626 }
2627 else
2628 {
2629 asection *osec;
2630
2631 osec = sec->output_section;
2632 sindx = elf_section_data (osec)->dynindx;
2633 BFD_ASSERT (sindx > 0);
2634
2635 /* We are turning this relocation into one
2636 against a section symbol, so subtract out
2637 the output section's address but not the
2638 offset of the input section in the output
2639 section. */
2640
2641 outrel.r_addend -= osec->vma;
2642 }
2643 outrel.r_info = ELF32_R_INFO (sindx, r_type);
2644 }
2645 }
2646
2647 sreloc = elf_section_data (input_section)->sreloc;
2648 if (sreloc == NULL)
2649 abort ();
2650
2651 loc = sreloc->contents;
2652 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2653 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2654
2655 /* If this reloc is against an external symbol, we do
2656 not want to fiddle with the addend. Otherwise, we
2657 need to include the symbol value so that it becomes
2658 an addend for the dynamic reloc. */
2659 if (! relocate)
2660 continue;
2661 }
2662 break;
2663
2664 /* Relocations for tls literal pool entries. */
2665 case R_390_TLS_IE32:
2666 if (info->shared)
2667 {
2668 Elf_Internal_Rela outrel;
2669 asection *sreloc;
2670 bfd_byte *loc;
2671
2672 outrel.r_offset = rel->r_offset
2673 + input_section->output_section->vma
2674 + input_section->output_offset;
2675 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2676 sreloc = elf_section_data (input_section)->sreloc;
2677 if (sreloc == NULL)
2678 abort ();
2679 loc = sreloc->contents;
2680 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2681 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2682 }
2683 /* Fall through. */
2684
2685 case R_390_TLS_GD32:
2686 case R_390_TLS_GOTIE32:
2687 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2688 tls_type = GOT_UNKNOWN;
2689 if (h == NULL && local_got_offsets)
2690 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2691 else if (h != NULL)
2692 {
2693 tls_type = elf_s390_hash_entry(h)->tls_type;
2694 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2695 r_type = R_390_TLS_LE32;
2696 }
2697 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE)
2698 r_type = R_390_TLS_IE32;
2699
2700 if (r_type == R_390_TLS_LE32)
2701 {
2702 /* This relocation gets optimized away by the local exec
2703 access optimization. */
2704 BFD_ASSERT (! unresolved_reloc);
2705 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2706 contents + rel->r_offset);
2707 continue;
2708 }
2709
2710 if (htab->sgot == NULL)
2711 abort ();
2712
2713 if (h != NULL)
2714 off = h->got.offset;
2715 else
2716 {
2717 if (local_got_offsets == NULL)
2718 abort ();
2719
2720 off = local_got_offsets[r_symndx];
2721 }
2722
2723 emit_tls_relocs:
2724
2725 if ((off & 1) != 0)
2726 off &= ~1;
2727 else
2728 {
2729 Elf_Internal_Rela outrel;
2730 bfd_byte *loc;
2731 int dr_type, indx;
2732
2733 if (htab->srelgot == NULL)
2734 abort ();
2735
2736 outrel.r_offset = (htab->sgot->output_section->vma
2737 + htab->sgot->output_offset + off);
2738
2739 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2740 if (r_type == R_390_TLS_GD32)
2741 dr_type = R_390_TLS_DTPMOD;
2742 else
2743 dr_type = R_390_TLS_TPOFF;
2744 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2745 outrel.r_addend = relocation - dtpoff_base (info);
2746 else
2747 outrel.r_addend = 0;
2748 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2749 loc = htab->srelgot->contents;
2750 loc += htab->srelgot->reloc_count++
2751 * sizeof (Elf32_External_Rela);
2752 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2753
2754 if (r_type == R_390_TLS_GD32)
2755 {
2756 if (indx == 0)
2757 {
2758 BFD_ASSERT (! unresolved_reloc);
2759 bfd_put_32 (output_bfd,
2760 relocation - dtpoff_base (info),
2761 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2762 }
2763 else
2764 {
2765 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF);
2766 outrel.r_offset += GOT_ENTRY_SIZE;
2767 outrel.r_addend = 0;
2768 htab->srelgot->reloc_count++;
2769 loc += sizeof (Elf32_External_Rela);
2770 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2771 }
2772 }
2773
2774 if (h != NULL)
2775 h->got.offset |= 1;
2776 else
2777 local_got_offsets[r_symndx] |= 1;
2778 }
2779
2780 if (off >= (bfd_vma) -2)
2781 abort ();
2782 if (r_type == ELF32_R_TYPE (rel->r_info))
2783 {
2784 relocation = htab->sgot->output_offset + off;
2785 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT)
2786 relocation += htab->sgot->output_section->vma;
2787 unresolved_reloc = FALSE;
2788 }
2789 else
2790 {
2791 bfd_put_32 (output_bfd, htab->sgot->output_offset + off,
2792 contents + rel->r_offset);
2793 continue;
2794 }
2795 break;
2796
2797 case R_390_TLS_GOTIE12:
2798 case R_390_TLS_GOTIE20:
2799 case R_390_TLS_IEENT:
2800 if (h == NULL)
2801 {
2802 if (local_got_offsets == NULL)
2803 abort();
2804 off = local_got_offsets[r_symndx];
2805 if (info->shared)
2806 goto emit_tls_relocs;
2807 }
2808 else
2809 {
2810 off = h->got.offset;
2811 tls_type = elf_s390_hash_entry(h)->tls_type;
2812 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2813 goto emit_tls_relocs;
2814 }
2815
2816 if (htab->sgot == NULL)
2817 abort ();
2818
2819 BFD_ASSERT (! unresolved_reloc);
2820 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2821 htab->sgot->contents + off);
2822 relocation = htab->sgot->output_offset + off;
2823 if (r_type == R_390_TLS_IEENT)
2824 relocation += htab->sgot->output_section->vma;
2825 unresolved_reloc = FALSE;
2826 break;
2827
2828 case R_390_TLS_LDM32:
2829 if (! info->shared)
2830 /* The literal pool entry this relocation refers to gets ignored
2831 by the optimized code of the local exec model. Do nothing
2832 and the value will turn out zero. */
2833 continue;
2834
2835 if (htab->sgot == NULL)
2836 abort ();
2837
2838 off = htab->tls_ldm_got.offset;
2839 if (off & 1)
2840 off &= ~1;
2841 else
2842 {
2843 Elf_Internal_Rela outrel;
2844 bfd_byte *loc;
2845
2846 if (htab->srelgot == NULL)
2847 abort ();
2848
2849 outrel.r_offset = (htab->sgot->output_section->vma
2850 + htab->sgot->output_offset + off);
2851
2852 bfd_put_32 (output_bfd, 0,
2853 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2854 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD);
2855 outrel.r_addend = 0;
2856 loc = htab->srelgot->contents;
2857 loc += htab->srelgot->reloc_count++
2858 * sizeof (Elf32_External_Rela);
2859 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2860 htab->tls_ldm_got.offset |= 1;
2861 }
2862 relocation = htab->sgot->output_offset + off;
2863 unresolved_reloc = FALSE;
2864 break;
2865
2866 case R_390_TLS_LE32:
2867 if (info->shared)
2868 {
2869 /* Linking a shared library with non-fpic code requires
2870 a R_390_TLS_TPOFF relocation. */
2871 Elf_Internal_Rela outrel;
2872 asection *sreloc;
2873 bfd_byte *loc;
2874 int indx;
2875
2876 outrel.r_offset = rel->r_offset
2877 + input_section->output_section->vma
2878 + input_section->output_offset;
2879 if (h != NULL && h->dynindx != -1)
2880 indx = h->dynindx;
2881 else
2882 indx = 0;
2883 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF);
2884 if (indx == 0)
2885 outrel.r_addend = relocation - dtpoff_base (info);
2886 else
2887 outrel.r_addend = 0;
2888 sreloc = elf_section_data (input_section)->sreloc;
2889 if (sreloc == NULL)
2890 abort ();
2891 loc = sreloc->contents;
2892 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2893 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2894 }
2895 else
2896 {
2897 BFD_ASSERT (! unresolved_reloc);
2898 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2899 contents + rel->r_offset);
2900 }
2901 continue;
2902
2903 case R_390_TLS_LDO32:
2904 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2905 relocation -= dtpoff_base (info);
2906 else
2907 /* When converting LDO to LE, we must negate. */
2908 relocation = -tpoff (info, relocation);
2909 break;
2910
2911 /* Relocations for tls instructions. */
2912 case R_390_TLS_LOAD:
2913 case R_390_TLS_GDCALL:
2914 case R_390_TLS_LDCALL:
2915 tls_type = GOT_UNKNOWN;
2916 if (h == NULL && local_got_offsets)
2917 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2918 else if (h != NULL)
2919 tls_type = elf_s390_hash_entry(h)->tls_type;
2920
2921 if (tls_type == GOT_TLS_GD)
2922 continue;
2923
2924 if (r_type == R_390_TLS_LOAD)
2925 {
2926 if (!info->shared && (h == NULL || h->dynindx == -1))
2927 {
2928 /* IE->LE transition. Four valid cases:
2929 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0
2930 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0
2931 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0
2932 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2933 unsigned int insn, ry;
2934
2935 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2936 ry = 0;
2937 if ((insn & 0xff00f000) == 0x58000000)
2938 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */
2939 ry = (insn & 0x000f0000);
2940 else if ((insn & 0xff0f0000) == 0x58000000)
2941 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */
2942 ry = (insn & 0x0000f000) << 4;
2943 else if ((insn & 0xff00f000) == 0x5800c000)
2944 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */
2945 ry = (insn & 0x000f0000);
2946 else if ((insn & 0xff0f0000) == 0x580c0000)
2947 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2948 ry = (insn & 0x0000f000) << 4;
2949 else
2950 invalid_tls_insn (input_bfd, input_section, rel);
2951 insn = 0x18000700 | (insn & 0x00f00000) | ry;
2952 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2953 }
2954 }
2955 else if (r_type == R_390_TLS_GDCALL)
2956 {
2957 unsigned int insn;
2958
2959 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2960 if ((insn & 0xff000fff) != 0x4d000000)
2961 invalid_tls_insn (input_bfd, input_section, rel);
2962 if (!info->shared && (h == NULL || h->dynindx == -1))
2963 /* GD->LE transition.
2964 bas %r14,0(%rx,%r13) -> bc 0,0 */
2965 insn = 0x47000000;
2966 else
2967 /* GD->IE transition.
2968 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */
2969 insn = 0x5822c000;
2970 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2971 }
2972 else if (r_type == R_390_TLS_LDCALL)
2973 {
2974 if (!info->shared)
2975 {
2976 unsigned int insn;
2977
2978 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2979 if ((insn & 0xff000fff) != 0x4d000000)
2980 invalid_tls_insn (input_bfd, input_section, rel);
2981 /* LD->LE transition.
2982 bas %r14,0(%rx,%r13) -> bc 0,0 */
2983 insn = 0x47000000;
2984 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2985 }
2986 }
2987 continue;
2988
2989 default:
2990 break;
2991 }
2992
2993 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2994 because such sections are not SEC_ALLOC and thus ld.so will
2995 not process them. */
2996 if (unresolved_reloc
2997 && !((input_section->flags & SEC_DEBUGGING) != 0
2998 && h->def_dynamic))
2999 (*_bfd_error_handler)
3000 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
3001 input_bfd,
3002 input_section,
3003 (long) rel->r_offset,
3004 h->root.root.string);
3005
3006 if (r_type == R_390_20
3007 || r_type == R_390_GOT20
3008 || r_type == R_390_GOTPLT20
3009 || r_type == R_390_TLS_GOTIE20)
3010 {
3011 relocation += rel->r_addend;
3012 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3013 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3014 contents, rel->r_offset,
3015 relocation, 0);
3016 }
3017 else
3018 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3019 contents, rel->r_offset,
3020 relocation, rel->r_addend);
3021
3022 if (r != bfd_reloc_ok)
3023 {
3024 const char *name;
3025
3026 if (h != NULL)
3027 name = h->root.root.string;
3028 else
3029 {
3030 name = bfd_elf_string_from_elf_section (input_bfd,
3031 symtab_hdr->sh_link,
3032 sym->st_name);
3033 if (name == NULL)
3034 return FALSE;
3035 if (*name == '\0')
3036 name = bfd_section_name (input_bfd, sec);
3037 }
3038
3039 if (r == bfd_reloc_overflow)
3040 {
3041
3042 if (! ((*info->callbacks->reloc_overflow)
3043 (info, (h ? &h->root : NULL), name, howto->name,
3044 (bfd_vma) 0, input_bfd, input_section,
3045 rel->r_offset)))
3046 return FALSE;
3047 }
3048 else
3049 {
3050 (*_bfd_error_handler)
3051 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3052 input_bfd, input_section,
3053 (long) rel->r_offset, name, (int) r);
3054 return FALSE;
3055 }
3056 }
3057 }
3058
3059 return TRUE;
3060 }
3061
3062 /* Finish up dynamic symbol handling. We set the contents of various
3063 dynamic sections here. */
3064
3065 static bfd_boolean
3066 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3067 bfd *output_bfd;
3068 struct bfd_link_info *info;
3069 struct elf_link_hash_entry *h;
3070 Elf_Internal_Sym *sym;
3071 {
3072 struct elf_s390_link_hash_table *htab;
3073
3074 htab = elf_s390_hash_table (info);
3075
3076 if (h->plt.offset != (bfd_vma) -1)
3077 {
3078 bfd_vma plt_index;
3079 bfd_vma got_offset;
3080 Elf_Internal_Rela rela;
3081 bfd_byte *loc;
3082 bfd_vma relative_offset;
3083
3084 /* This symbol has an entry in the procedure linkage table. Set
3085 it up. */
3086 if (h->dynindx == -1
3087 || htab->splt == NULL
3088 || htab->sgotplt == NULL
3089 || htab->srelplt == NULL)
3090 abort ();
3091
3092 /* Calc. index no.
3093 Current offset - size first entry / entry size. */
3094 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3095
3096 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
3097 addr & GOT addr. */
3098 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3099
3100 /* S390 uses halfwords for relative branch calc! */
3101 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
3102 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
3103 /* If offset is > 32768, branch to a previous branch
3104 390 can only handle +-64 K jumps. */
3105 if ( -32768 > (int) relative_offset )
3106 relative_offset
3107 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3108
3109 /* Fill in the entry in the procedure linkage table. */
3110 if (!info->shared)
3111 {
3112 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3113 htab->splt->contents + h->plt.offset);
3114 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3115 htab->splt->contents + h->plt.offset + 4);
3116 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3117 htab->splt->contents + h->plt.offset + 8);
3118 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3119 htab->splt->contents + h->plt.offset + 12);
3120 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3121 htab->splt->contents + h->plt.offset + 16);
3122 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3123 htab->splt->contents + h->plt.offset + 20);
3124 bfd_put_32 (output_bfd,
3125 (htab->sgotplt->output_section->vma
3126 + htab->sgotplt->output_offset
3127 + got_offset),
3128 htab->splt->contents + h->plt.offset + 24);
3129 }
3130 else if (got_offset < 4096)
3131 {
3132 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD0 + got_offset,
3133 htab->splt->contents + h->plt.offset);
3134 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD1,
3135 htab->splt->contents + h->plt.offset + 4);
3136 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD2,
3137 htab->splt->contents + h->plt.offset + 8);
3138 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD3,
3139 htab->splt->contents + h->plt.offset + 12);
3140 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD4,
3141 htab->splt->contents + h->plt.offset + 16);
3142 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3143 htab->splt->contents + h->plt.offset + 20);
3144 bfd_put_32 (output_bfd, (bfd_vma) 0,
3145 htab->splt->contents + h->plt.offset + 24);
3146 }
3147 else if (got_offset < 32768)
3148 {
3149 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD0 + got_offset,
3150 htab->splt->contents + h->plt.offset);
3151 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD1,
3152 htab->splt->contents + h->plt.offset + 4);
3153 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD2,
3154 htab->splt->contents + h->plt.offset + 8);
3155 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD3,
3156 htab->splt->contents + h->plt.offset + 12);
3157 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD4,
3158 htab->splt->contents + h->plt.offset + 16);
3159 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3160 htab->splt->contents + h->plt.offset + 20);
3161 bfd_put_32 (output_bfd, (bfd_vma) 0,
3162 htab->splt->contents + h->plt.offset + 24);
3163 }
3164 else
3165 {
3166 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD0,
3167 htab->splt->contents + h->plt.offset);
3168 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD1,
3169 htab->splt->contents + h->plt.offset + 4);
3170 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD2,
3171 htab->splt->contents + h->plt.offset + 8);
3172 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD3,
3173 htab->splt->contents + h->plt.offset + 12);
3174 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD4,
3175 htab->splt->contents + h->plt.offset + 16);
3176 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3177 htab->splt->contents + h->plt.offset + 20);
3178 bfd_put_32 (output_bfd, got_offset,
3179 htab->splt->contents + h->plt.offset + 24);
3180 }
3181 /* Insert offset into reloc. table here. */
3182 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
3183 htab->splt->contents + h->plt.offset + 28);
3184
3185 /* Fill in the entry in the global offset table.
3186 Points to instruction after GOT offset. */
3187 bfd_put_32 (output_bfd,
3188 (htab->splt->output_section->vma
3189 + htab->splt->output_offset
3190 + h->plt.offset
3191 + 12),
3192 htab->sgotplt->contents + got_offset);
3193
3194 /* Fill in the entry in the .rela.plt section. */
3195 rela.r_offset = (htab->sgotplt->output_section->vma
3196 + htab->sgotplt->output_offset
3197 + got_offset);
3198 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3199 rela.r_addend = 0;
3200 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rela);
3201 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3202
3203 if (!h->def_regular)
3204 {
3205 /* Mark the symbol as undefined, rather than as defined in
3206 the .plt section. Leave the value alone. This is a clue
3207 for the dynamic linker, to make function pointer
3208 comparisons work between an application and shared
3209 library. */
3210 sym->st_shndx = SHN_UNDEF;
3211 }
3212 }
3213
3214 if (h->got.offset != (bfd_vma) -1
3215 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3216 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3217 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3218 {
3219 Elf_Internal_Rela rela;
3220 bfd_byte *loc;
3221
3222 /* This symbol has an entry in the global offset table. Set it
3223 up. */
3224
3225 if (htab->sgot == NULL || htab->srelgot == NULL)
3226 abort ();
3227
3228 rela.r_offset = (htab->sgot->output_section->vma
3229 + htab->sgot->output_offset
3230 + (h->got.offset &~ (bfd_vma) 1));
3231
3232 /* If this is a static link, or it is a -Bsymbolic link and the
3233 symbol is defined locally or was forced to be local because
3234 of a version file, we just want to emit a RELATIVE reloc.
3235 The entry in the global offset table will already have been
3236 initialized in the relocate_section function. */
3237 if (info->shared
3238 && (info->symbolic
3239 || h->dynindx == -1
3240 || h->forced_local)
3241 && h->def_regular)
3242 {
3243 BFD_ASSERT((h->got.offset & 1) != 0);
3244 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
3245 rela.r_addend = (h->root.u.def.value
3246 + h->root.u.def.section->output_section->vma
3247 + h->root.u.def.section->output_offset);
3248 }
3249 else
3250 {
3251 BFD_ASSERT((h->got.offset & 1) == 0);
3252 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3253 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
3254 rela.r_addend = 0;
3255 }
3256
3257 loc = htab->srelgot->contents;
3258 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3259 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3260 }
3261
3262 if (h->needs_copy)
3263 {
3264 Elf_Internal_Rela rela;
3265 bfd_byte *loc;
3266
3267 /* This symbols needs a copy reloc. Set it up. */
3268
3269 if (h->dynindx == -1
3270 || (h->root.type != bfd_link_hash_defined
3271 && h->root.type != bfd_link_hash_defweak)
3272 || htab->srelbss == NULL)
3273 abort ();
3274
3275 rela.r_offset = (h->root.u.def.value
3276 + h->root.u.def.section->output_section->vma
3277 + h->root.u.def.section->output_offset);
3278 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
3279 rela.r_addend = 0;
3280 loc = htab->srelbss->contents;
3281 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rela);
3282 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3283 }
3284
3285 /* Mark some specially defined symbols as absolute. */
3286 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3287 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
3288 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
3289 sym->st_shndx = SHN_ABS;
3290
3291 return TRUE;
3292 }
3293
3294 /* Used to decide how to sort relocs in an optimal manner for the
3295 dynamic linker, before writing them out. */
3296
3297 static enum elf_reloc_type_class
3298 elf_s390_reloc_type_class (rela)
3299 const Elf_Internal_Rela *rela;
3300 {
3301 switch ((int) ELF32_R_TYPE (rela->r_info))
3302 {
3303 case R_390_RELATIVE:
3304 return reloc_class_relative;
3305 case R_390_JMP_SLOT:
3306 return reloc_class_plt;
3307 case R_390_COPY:
3308 return reloc_class_copy;
3309 default:
3310 return reloc_class_normal;
3311 }
3312 }
3313
3314 /* Finish up the dynamic sections. */
3315
3316 static bfd_boolean
3317 elf_s390_finish_dynamic_sections (output_bfd, info)
3318 bfd *output_bfd;
3319 struct bfd_link_info *info;
3320 {
3321 struct elf_s390_link_hash_table *htab;
3322 bfd *dynobj;
3323 asection *sdyn;
3324
3325 htab = elf_s390_hash_table (info);
3326 dynobj = htab->elf.dynobj;
3327 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3328
3329 if (htab->elf.dynamic_sections_created)
3330 {
3331 Elf32_External_Dyn *dyncon, *dynconend;
3332
3333 if (sdyn == NULL || htab->sgot == NULL)
3334 abort ();
3335
3336 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3337 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3338 for (; dyncon < dynconend; dyncon++)
3339 {
3340 Elf_Internal_Dyn dyn;
3341 asection *s;
3342
3343 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3344
3345 switch (dyn.d_tag)
3346 {
3347 default:
3348 continue;
3349
3350 case DT_PLTGOT:
3351 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3352 break;
3353
3354 case DT_JMPREL:
3355 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3356 break;
3357
3358 case DT_PLTRELSZ:
3359 s = htab->srelplt->output_section;
3360 dyn.d_un.d_val = s->size;
3361 break;
3362 }
3363
3364 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3365 }
3366
3367 /* Fill in the special first entry in the procedure linkage table. */
3368 if (htab->splt && htab->splt->size > 0)
3369 {
3370 memset (htab->splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
3371 if (info->shared)
3372 {
3373 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD0,
3374 htab->splt->contents );
3375 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD1,
3376 htab->splt->contents +4 );
3377 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD2,
3378 htab->splt->contents +8 );
3379 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD3,
3380 htab->splt->contents +12 );
3381 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD4,
3382 htab->splt->contents +16 );
3383 }
3384 else
3385 {
3386 bfd_put_32 (output_bfd, (bfd_vma)PLT_FIRST_ENTRY_WORD0,
3387 htab->splt->contents );
3388 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3389 htab->splt->contents +4 );
3390 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD2,
3391 htab->splt->contents +8 );
3392 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3393 htab->splt->contents +12 );
3394 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3395 htab->splt->contents +16 );
3396 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3397 htab->splt->contents +20 );
3398 bfd_put_32 (output_bfd,
3399 htab->sgotplt->output_section->vma
3400 + htab->sgotplt->output_offset,
3401 htab->splt->contents + 24);
3402 }
3403 elf_section_data (htab->splt->output_section)
3404 ->this_hdr.sh_entsize = 4;
3405 }
3406
3407 }
3408
3409 if (htab->sgotplt)
3410 {
3411 /* Fill in the first three entries in the global offset table. */
3412 if (htab->sgotplt->size > 0)
3413 {
3414 bfd_put_32 (output_bfd,
3415 (sdyn == NULL ? (bfd_vma) 0
3416 : sdyn->output_section->vma + sdyn->output_offset),
3417 htab->sgotplt->contents);
3418 /* One entry for shared object struct ptr. */
3419 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4);
3420 /* One entry for _dl_runtime_resolve. */
3421 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3422 }
3423
3424 elf_section_data (htab->sgotplt->output_section)
3425 ->this_hdr.sh_entsize = 4;
3426 }
3427 return TRUE;
3428 }
3429
3430 static bfd_boolean
3431 elf_s390_grok_prstatus (abfd, note)
3432 bfd * abfd;
3433 Elf_Internal_Note * note;
3434 {
3435 int offset;
3436 unsigned int size;
3437
3438 switch (note->descsz)
3439 {
3440 default:
3441 return FALSE;
3442
3443 case 224: /* S/390 Linux. */
3444 /* pr_cursig */
3445 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3446
3447 /* pr_pid */
3448 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
3449
3450 /* pr_reg */
3451 offset = 72;
3452 size = 144;
3453 break;
3454 }
3455
3456 /* Make a ".reg/999" section. */
3457 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3458 size, note->descpos + offset);
3459 }
3460
3461 /* Return address for Ith PLT stub in section PLT, for relocation REL
3462 or (bfd_vma) -1 if it should not be included. */
3463
3464 static bfd_vma
3465 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3466 const arelent *rel ATTRIBUTE_UNUSED)
3467 {
3468 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3469 }
3470
3471
3472 #define TARGET_BIG_SYM bfd_elf32_s390_vec
3473 #define TARGET_BIG_NAME "elf32-s390"
3474 #define ELF_ARCH bfd_arch_s390
3475 #define ELF_MACHINE_CODE EM_S390
3476 #define ELF_MACHINE_ALT1 EM_S390_OLD
3477 #define ELF_MAXPAGESIZE 0x1000
3478
3479 #define elf_backend_can_gc_sections 1
3480 #define elf_backend_can_refcount 1
3481 #define elf_backend_want_got_plt 1
3482 #define elf_backend_plt_readonly 1
3483 #define elf_backend_want_plt_sym 0
3484 #define elf_backend_got_header_size 12
3485 #define elf_backend_rela_normal 1
3486
3487 #define elf_info_to_howto elf_s390_info_to_howto
3488
3489 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
3490 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
3491 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3492
3493 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3494 #define elf_backend_check_relocs elf_s390_check_relocs
3495 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3496 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3497 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3498 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3499 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3500 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3501 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3502 #define elf_backend_relocate_section elf_s390_relocate_section
3503 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3504 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3505 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
3506 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3507
3508 #define bfd_elf32_mkobject elf_s390_mkobject
3509 #define elf_backend_object_p elf_s390_object_p
3510
3511 #include "elf32-target.h"
GDB Binutils - Deliverables
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