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[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 Free Software Foundation, Inc.
3 Contributed by Carl B. Pedersen and Martin Schwidefsky.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
20 02111-1307, USA. */
21
22 #include "bfd.h"
23 #include "sysdep.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27
28 static reloc_howto_type *elf_s390_reloc_type_lookup
29 PARAMS ((bfd *, bfd_reloc_code_real_type));
30 static void elf_s390_info_to_howto
31 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
32 static bfd_boolean elf_s390_is_local_label_name
33 PARAMS ((bfd *, const char *));
34 static struct bfd_hash_entry *link_hash_newfunc
35 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
36 static struct bfd_link_hash_table *elf_s390_link_hash_table_create
37 PARAMS ((bfd *));
38 static bfd_boolean create_got_section
39 PARAMS((bfd *, struct bfd_link_info *));
40 static bfd_boolean elf_s390_create_dynamic_sections
41 PARAMS((bfd *, struct bfd_link_info *));
42 static void elf_s390_copy_indirect_symbol
43 PARAMS ((const struct elf_backend_data *, struct elf_link_hash_entry *,
44 struct elf_link_hash_entry *));
45 static bfd_boolean elf_s390_check_relocs
46 PARAMS ((bfd *, struct bfd_link_info *, asection *,
47 const Elf_Internal_Rela *));
48 static asection *elf_s390_gc_mark_hook
49 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
50 struct elf_link_hash_entry *, Elf_Internal_Sym *));
51 static bfd_boolean elf_s390_gc_sweep_hook
52 PARAMS ((bfd *, struct bfd_link_info *, asection *,
53 const Elf_Internal_Rela *));
54 struct elf_s390_link_hash_entry;
55 static void elf_s390_adjust_gotplt
56 PARAMS ((struct elf_s390_link_hash_entry *));
57 static bfd_boolean elf_s390_adjust_dynamic_symbol
58 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
59 static bfd_boolean allocate_dynrelocs
60 PARAMS ((struct elf_link_hash_entry *, PTR));
61 static bfd_boolean readonly_dynrelocs
62 PARAMS ((struct elf_link_hash_entry *, PTR));
63 static bfd_boolean elf_s390_size_dynamic_sections
64 PARAMS ((bfd *, struct bfd_link_info *));
65 static bfd_boolean elf_s390_relocate_section
66 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
67 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
68 static bfd_boolean elf_s390_finish_dynamic_symbol
69 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
70 Elf_Internal_Sym *));
71 static enum elf_reloc_type_class elf_s390_reloc_type_class
72 PARAMS ((const Elf_Internal_Rela *));
73 static bfd_boolean elf_s390_finish_dynamic_sections
74 PARAMS ((bfd *, struct bfd_link_info *));
75 static bfd_boolean elf_s390_mkobject
76 PARAMS ((bfd *));
77 static bfd_boolean elf_s390_object_p
78 PARAMS ((bfd *));
79 static bfd_boolean elf_s390_grok_prstatus
80 PARAMS ((bfd *, Elf_Internal_Note *));
81 static int elf_s390_tls_transition
82 PARAMS ((struct bfd_link_info *, int, int));
83 static bfd_reloc_status_type s390_tls_reloc
84 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
85 static bfd_vma dtpoff_base
86 PARAMS ((struct bfd_link_info *));
87 static bfd_vma tpoff
88 PARAMS ((struct bfd_link_info *, bfd_vma));
89 static void invalid_tls_insn
90 PARAMS ((bfd *, asection *, Elf_Internal_Rela *));
91 static bfd_reloc_status_type s390_elf_ldisp_reloc
92 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
93
94 #include "elf/s390.h"
95
96 /* The relocation "howto" table. */
97
98 static reloc_howto_type elf_howto_table[] =
99 {
100 HOWTO (R_390_NONE, /* type */
101 0, /* rightshift */
102 0, /* size (0 = byte, 1 = short, 2 = long) */
103 0, /* bitsize */
104 FALSE, /* pc_relative */
105 0, /* bitpos */
106 complain_overflow_dont, /* complain_on_overflow */
107 bfd_elf_generic_reloc, /* special_function */
108 "R_390_NONE", /* name */
109 FALSE, /* partial_inplace */
110 0, /* src_mask */
111 0, /* dst_mask */
112 FALSE), /* pcrel_offset */
113
114 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
115 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
116 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
117 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
118 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
120 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
122 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
124 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
126 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
128 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
130 HOWTO(R_390_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,0xffffffff, FALSE),
132 HOWTO(R_390_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,0xffffffff, FALSE),
134 HOWTO(R_390_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
135 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,0xffffffff, FALSE),
136 HOWTO(R_390_RELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
137 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,0xffffffff, FALSE),
138 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,0xffffffff, FALSE),
140 HOWTO(R_390_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,0xffffffff, TRUE),
142 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
143 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
144 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
146 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
148 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
150 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
152 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
153 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
154 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
155 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,0xffffffff, TRUE),
156 EMPTY_HOWTO (R_390_64), /* Empty entry for R_390_64. */
157 EMPTY_HOWTO (R_390_PC64), /* Empty entry for R_390_PC64. */
158 EMPTY_HOWTO (R_390_GOT64), /* Empty entry for R_390_GOT64. */
159 EMPTY_HOWTO (R_390_PLT64), /* Empty entry for R_390_PLT64. */
160 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
161 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,0xffffffff, TRUE),
162 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
163 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
164 EMPTY_HOWTO (R_390_GOTOFF64), /* Empty entry for R_390_GOTOFF64. */
165 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
166 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
167 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
168 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
169 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
170 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
171 EMPTY_HOWTO (R_390_GOTPLT64), /* Empty entry for R_390_GOTPLT64. */
172 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
173 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,0xffffffff, TRUE),
174 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
175 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
176 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
177 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
178 EMPTY_HOWTO (R_390_PLTOFF64), /* Empty entry for R_390_PLTOFF64. */
179 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont,
180 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE),
181 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
182 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE),
183 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
184 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE),
185 HOWTO(R_390_TLS_GD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
186 bfd_elf_generic_reloc, "R_390_TLS_GD32", FALSE, 0, 0xffffffff, FALSE),
187 EMPTY_HOWTO (R_390_TLS_GD64), /* Empty entry for R_390_TLS_GD64. */
188 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
189 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE),
190 HOWTO(R_390_TLS_GOTIE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
191 bfd_elf_generic_reloc, "R_390_TLS_GOTIE32", FALSE, 0, 0xffffffff, FALSE),
192 EMPTY_HOWTO (R_390_TLS_GOTIE64), /* Empty entry for R_390_TLS_GOTIE64. */
193 HOWTO(R_390_TLS_LDM32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
194 bfd_elf_generic_reloc, "R_390_TLS_LDM32", FALSE, 0, 0xffffffff, FALSE),
195 EMPTY_HOWTO (R_390_TLS_LDM64), /* Empty entry for R_390_TLS_LDM64. */
196 HOWTO(R_390_TLS_IE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
197 bfd_elf_generic_reloc, "R_390_TLS_IE32", FALSE, 0, 0xffffffff, FALSE),
198 EMPTY_HOWTO (R_390_TLS_IE64), /* Empty entry for R_390_TLS_IE64. */
199 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
200 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, 0xffffffff, TRUE),
201 HOWTO(R_390_TLS_LE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
202 bfd_elf_generic_reloc, "R_390_TLS_LE32", FALSE, 0, 0xffffffff, FALSE),
203 EMPTY_HOWTO (R_390_TLS_LE64), /* Empty entry for R_390_TLS_LE64. */
204 HOWTO(R_390_TLS_LDO32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
205 bfd_elf_generic_reloc, "R_390_TLS_LDO32", FALSE, 0, 0xffffffff, FALSE),
206 EMPTY_HOWTO (R_390_TLS_LDO64), /* Empty entry for R_390_TLS_LDO64. */
207 HOWTO(R_390_TLS_DTPMOD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
208 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, 0xffffffff, FALSE),
209 HOWTO(R_390_TLS_DTPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
210 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, 0xffffffff, FALSE),
211 HOWTO(R_390_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
212 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, 0xffffffff, FALSE),
213 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
214 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE),
215 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
216 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE),
217 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
218 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE),
219 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
220 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE),
221 };
222
223 /* GNU extension to record C++ vtable hierarchy. */
224 static reloc_howto_type elf32_s390_vtinherit_howto =
225 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
226 static reloc_howto_type elf32_s390_vtentry_howto =
227 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);
228
229 static reloc_howto_type *
230 elf_s390_reloc_type_lookup (abfd, code)
231 bfd *abfd ATTRIBUTE_UNUSED;
232 bfd_reloc_code_real_type code;
233 {
234 switch (code)
235 {
236 case BFD_RELOC_NONE:
237 return &elf_howto_table[(int) R_390_NONE];
238 case BFD_RELOC_8:
239 return &elf_howto_table[(int) R_390_8];
240 case BFD_RELOC_390_12:
241 return &elf_howto_table[(int) R_390_12];
242 case BFD_RELOC_16:
243 return &elf_howto_table[(int) R_390_16];
244 case BFD_RELOC_32:
245 return &elf_howto_table[(int) R_390_32];
246 case BFD_RELOC_CTOR:
247 return &elf_howto_table[(int) R_390_32];
248 case BFD_RELOC_32_PCREL:
249 return &elf_howto_table[(int) R_390_PC32];
250 case BFD_RELOC_390_GOT12:
251 return &elf_howto_table[(int) R_390_GOT12];
252 case BFD_RELOC_32_GOT_PCREL:
253 return &elf_howto_table[(int) R_390_GOT32];
254 case BFD_RELOC_390_PLT32:
255 return &elf_howto_table[(int) R_390_PLT32];
256 case BFD_RELOC_390_COPY:
257 return &elf_howto_table[(int) R_390_COPY];
258 case BFD_RELOC_390_GLOB_DAT:
259 return &elf_howto_table[(int) R_390_GLOB_DAT];
260 case BFD_RELOC_390_JMP_SLOT:
261 return &elf_howto_table[(int) R_390_JMP_SLOT];
262 case BFD_RELOC_390_RELATIVE:
263 return &elf_howto_table[(int) R_390_RELATIVE];
264 case BFD_RELOC_32_GOTOFF:
265 return &elf_howto_table[(int) R_390_GOTOFF32];
266 case BFD_RELOC_390_GOTPC:
267 return &elf_howto_table[(int) R_390_GOTPC];
268 case BFD_RELOC_390_GOT16:
269 return &elf_howto_table[(int) R_390_GOT16];
270 case BFD_RELOC_16_PCREL:
271 return &elf_howto_table[(int) R_390_PC16];
272 case BFD_RELOC_390_PC16DBL:
273 return &elf_howto_table[(int) R_390_PC16DBL];
274 case BFD_RELOC_390_PLT16DBL:
275 return &elf_howto_table[(int) R_390_PLT16DBL];
276 case BFD_RELOC_390_PC32DBL:
277 return &elf_howto_table[(int) R_390_PC32DBL];
278 case BFD_RELOC_390_PLT32DBL:
279 return &elf_howto_table[(int) R_390_PLT32DBL];
280 case BFD_RELOC_390_GOTPCDBL:
281 return &elf_howto_table[(int) R_390_GOTPCDBL];
282 case BFD_RELOC_390_GOTENT:
283 return &elf_howto_table[(int) R_390_GOTENT];
284 case BFD_RELOC_16_GOTOFF:
285 return &elf_howto_table[(int) R_390_GOTOFF16];
286 case BFD_RELOC_390_GOTPLT12:
287 return &elf_howto_table[(int) R_390_GOTPLT12];
288 case BFD_RELOC_390_GOTPLT16:
289 return &elf_howto_table[(int) R_390_GOTPLT16];
290 case BFD_RELOC_390_GOTPLT32:
291 return &elf_howto_table[(int) R_390_GOTPLT32];
292 case BFD_RELOC_390_GOTPLTENT:
293 return &elf_howto_table[(int) R_390_GOTPLTENT];
294 case BFD_RELOC_390_PLTOFF16:
295 return &elf_howto_table[(int) R_390_PLTOFF16];
296 case BFD_RELOC_390_PLTOFF32:
297 return &elf_howto_table[(int) R_390_PLTOFF32];
298 case BFD_RELOC_390_TLS_LOAD:
299 return &elf_howto_table[(int) R_390_TLS_LOAD];
300 case BFD_RELOC_390_TLS_GDCALL:
301 return &elf_howto_table[(int) R_390_TLS_GDCALL];
302 case BFD_RELOC_390_TLS_LDCALL:
303 return &elf_howto_table[(int) R_390_TLS_LDCALL];
304 case BFD_RELOC_390_TLS_GD32:
305 return &elf_howto_table[(int) R_390_TLS_GD32];
306 case BFD_RELOC_390_TLS_GOTIE12:
307 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
308 case BFD_RELOC_390_TLS_GOTIE32:
309 return &elf_howto_table[(int) R_390_TLS_GOTIE32];
310 case BFD_RELOC_390_TLS_LDM32:
311 return &elf_howto_table[(int) R_390_TLS_LDM32];
312 case BFD_RELOC_390_TLS_IE32:
313 return &elf_howto_table[(int) R_390_TLS_IE32];
314 case BFD_RELOC_390_TLS_IEENT:
315 return &elf_howto_table[(int) R_390_TLS_IEENT];
316 case BFD_RELOC_390_TLS_LE32:
317 return &elf_howto_table[(int) R_390_TLS_LE32];
318 case BFD_RELOC_390_TLS_LDO32:
319 return &elf_howto_table[(int) R_390_TLS_LDO32];
320 case BFD_RELOC_390_TLS_DTPMOD:
321 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
322 case BFD_RELOC_390_TLS_DTPOFF:
323 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
324 case BFD_RELOC_390_TLS_TPOFF:
325 return &elf_howto_table[(int) R_390_TLS_TPOFF];
326 case BFD_RELOC_390_20:
327 return &elf_howto_table[(int) R_390_20];
328 case BFD_RELOC_390_GOT20:
329 return &elf_howto_table[(int) R_390_GOT20];
330 case BFD_RELOC_390_GOTPLT20:
331 return &elf_howto_table[(int) R_390_GOTPLT20];
332 case BFD_RELOC_390_TLS_GOTIE20:
333 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
334 case BFD_RELOC_VTABLE_INHERIT:
335 return &elf32_s390_vtinherit_howto;
336 case BFD_RELOC_VTABLE_ENTRY:
337 return &elf32_s390_vtentry_howto;
338 default:
339 break;
340 }
341 return 0;
342 }
343
344 /* We need to use ELF32_R_TYPE so we have our own copy of this function,
345 and elf32-s390.c has its own copy. */
346
347 static void
348 elf_s390_info_to_howto (abfd, cache_ptr, dst)
349 bfd *abfd ATTRIBUTE_UNUSED;
350 arelent *cache_ptr;
351 Elf_Internal_Rela *dst;
352 {
353 switch (ELF32_R_TYPE(dst->r_info))
354 {
355 case R_390_GNU_VTINHERIT:
356 cache_ptr->howto = &elf32_s390_vtinherit_howto;
357 break;
358
359 case R_390_GNU_VTENTRY:
360 cache_ptr->howto = &elf32_s390_vtentry_howto;
361 break;
362
363 default:
364 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_390_max);
365 cache_ptr->howto = &elf_howto_table[ELF32_R_TYPE(dst->r_info)];
366 }
367 }
368
369 /* A relocation function which doesn't do anything. */
370 static bfd_reloc_status_type
371 s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section,
372 output_bfd, error_message)
373 bfd *abfd ATTRIBUTE_UNUSED;
374 arelent *reloc_entry;
375 asymbol *symbol ATTRIBUTE_UNUSED;
376 PTR data ATTRIBUTE_UNUSED;
377 asection *input_section;
378 bfd *output_bfd;
379 char **error_message ATTRIBUTE_UNUSED;
380 {
381 if (output_bfd)
382 reloc_entry->address += input_section->output_offset;
383 return bfd_reloc_ok;
384 }
385
386 /* Handle the large displacement relocs. */
387 static bfd_reloc_status_type
388 s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section,
389 output_bfd, error_message)
390 bfd *abfd ATTRIBUTE_UNUSED;
391 arelent *reloc_entry;
392 asymbol *symbol;
393 PTR data ATTRIBUTE_UNUSED;
394 asection *input_section;
395 bfd *output_bfd;
396 char **error_message ATTRIBUTE_UNUSED;
397 {
398 reloc_howto_type *howto = reloc_entry->howto;
399 bfd_vma relocation;
400 bfd_vma insn;
401
402 if (output_bfd != (bfd *) NULL
403 && (symbol->flags & BSF_SECTION_SYM) == 0
404 && (! howto->partial_inplace
405 || reloc_entry->addend == 0))
406 {
407 reloc_entry->address += input_section->output_offset;
408 return bfd_reloc_ok;
409 }
410
411 if (output_bfd != NULL)
412 return bfd_reloc_continue;
413
414 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
415 return bfd_reloc_outofrange;
416
417 relocation = (symbol->value
418 + symbol->section->output_section->vma
419 + symbol->section->output_offset);
420 relocation += reloc_entry->addend;
421 if (howto->pc_relative)
422 {
423 relocation -= (input_section->output_section->vma
424 + input_section->output_offset);
425 relocation -= reloc_entry->address;
426 }
427
428 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
429 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
430 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
431
432 if ((bfd_signed_vma) relocation < - 0x80000
433 || (bfd_signed_vma) relocation > 0x7ffff)
434 return bfd_reloc_overflow;
435 else
436 return bfd_reloc_ok;
437 }
438
439 static bfd_boolean
440 elf_s390_is_local_label_name (abfd, name)
441 bfd *abfd;
442 const char *name;
443 {
444 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
445 return TRUE;
446
447 return _bfd_elf_is_local_label_name (abfd, name);
448 }
449
450 /* Functions for the 390 ELF linker. */
451
452 /* The name of the dynamic interpreter. This is put in the .interp
453 section. */
454
455 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
456
457 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
458 copying dynamic variables from a shared lib into an app's dynbss
459 section, and instead use a dynamic relocation to point into the
460 shared lib. */
461 #define ELIMINATE_COPY_RELOCS 1
462
463 /* The size in bytes of the first entry in the procedure linkage table. */
464 #define PLT_FIRST_ENTRY_SIZE 32
465 /* The size in bytes of an entry in the procedure linkage table. */
466 #define PLT_ENTRY_SIZE 32
467
468 #define GOT_ENTRY_SIZE 4
469
470 /* The first three entries in a procedure linkage table are reserved,
471 and the initial contents are unimportant (we zero them out).
472 Subsequent entries look like this. See the SVR4 ABI 386
473 supplement to see how this works. */
474
475 /* For the s390, simple addr offset can only be 0 - 4096.
476 To use the full 2 GB address space, several instructions
477 are needed to load an address in a register and execute
478 a branch( or just saving the address)
479
480 Furthermore, only r 0 and 1 are free to use!!! */
481
482 /* The first 3 words in the GOT are then reserved.
483 Word 0 is the address of the dynamic table.
484 Word 1 is a pointer to a structure describing the object
485 Word 2 is used to point to the loader entry address.
486
487 The code for position independent PLT entries looks like this:
488
489 r12 holds addr of the current GOT at entry to the PLT
490
491 The GOT holds the address in the PLT to be executed.
492 The loader then gets:
493 24(15) = Pointer to the structure describing the object.
494 28(15) = Offset in symbol table
495
496 The loader must then find the module where the function is
497 and insert the address in the GOT.
498
499 Note: 390 can only address +- 64 K relative.
500 We check if offset > 65536, then make a relative branch -64xxx
501 back to a previous defined branch
502
503 PLT1: BASR 1,0 # 2 bytes
504 L 1,22(1) # 4 bytes Load offset in GOT in r 1
505 L 1,(1,12) # 4 bytes Load address from GOT in r1
506 BCR 15,1 # 2 bytes Jump to address
507 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
508 L 1,14(1) # 4 bytes Load offset in symol table in r1
509 BRC 15,-x # 4 bytes Jump to start of PLT
510 .word 0 # 2 bytes filler
511 .long ? # 4 bytes offset in GOT
512 .long ? # 4 bytes offset into symbol table
513
514 This was the general case. There are two additional, optimizes PLT
515 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768.
516 First the one for GOT offsets < 4096:
517
518 PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1
519 BCR 15,1 # 2 bytes Jump to address
520 .word 0,0,0 # 6 bytes filler
521 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
522 L 1,14(1) # 4 bytes Load offset in symbol table in r1
523 BRC 15,-x # 4 bytes Jump to start of PLT
524 .word 0,0,0 # 6 bytes filler
525 .long ? # 4 bytes offset into symbol table
526
527 Second the one for GOT offsets < 32768:
528
529 PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1
530 L 1,(1,12) # 4 bytes Load address from GOT to r1
531 BCR 15,1 # 2 bytes Jump to address
532 .word 0 # 2 bytes filler
533 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
534 L 1,14(1) # 4 bytes Load offset in symbol table in r1
535 BRC 15,-x # 4 bytes Jump to start of PLT
536 .word 0,0,0 # 6 bytes filler
537 .long ? # 4 bytes offset into symbol table
538
539 Total = 32 bytes per PLT entry
540
541 The code for static build PLT entries looks like this:
542
543 PLT1: BASR 1,0 # 2 bytes
544 L 1,22(1) # 4 bytes Load address of GOT entry
545 L 1,0(0,1) # 4 bytes Load address from GOT in r1
546 BCR 15,1 # 2 bytes Jump to address
547 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
548 L 1,14(1) # 4 bytes Load offset in symbol table in r1
549 BRC 15,-x # 4 bytes Jump to start of PLT
550 .word 0 # 2 bytes filler
551 .long ? # 4 bytes address of GOT entry
552 .long ? # 4 bytes offset into symbol table */
553
554 #define PLT_PIC_ENTRY_WORD0 0x0d105810
555 #define PLT_PIC_ENTRY_WORD1 0x10165811
556 #define PLT_PIC_ENTRY_WORD2 0xc00007f1
557 #define PLT_PIC_ENTRY_WORD3 0x0d105810
558 #define PLT_PIC_ENTRY_WORD4 0x100ea7f4
559
560 #define PLT_PIC12_ENTRY_WORD0 0x5810c000
561 #define PLT_PIC12_ENTRY_WORD1 0x07f10000
562 #define PLT_PIC12_ENTRY_WORD2 0x00000000
563 #define PLT_PIC12_ENTRY_WORD3 0x0d105810
564 #define PLT_PIC12_ENTRY_WORD4 0x100ea7f4
565
566 #define PLT_PIC16_ENTRY_WORD0 0xa7180000
567 #define PLT_PIC16_ENTRY_WORD1 0x5811c000
568 #define PLT_PIC16_ENTRY_WORD2 0x07f10000
569 #define PLT_PIC16_ENTRY_WORD3 0x0d105810
570 #define PLT_PIC16_ENTRY_WORD4 0x100ea7f4
571
572 #define PLT_ENTRY_WORD0 0x0d105810
573 #define PLT_ENTRY_WORD1 0x10165810
574 #define PLT_ENTRY_WORD2 0x100007f1
575 #define PLT_ENTRY_WORD3 0x0d105810
576 #define PLT_ENTRY_WORD4 0x100ea7f4
577
578 /* The first PLT entry pushes the offset into the symbol table
579 from R1 onto the stack at 8(15) and the loader object info
580 at 12(15), loads the loader address in R1 and jumps to it. */
581
582 /* The first entry in the PLT for PIC code:
583
584 PLT0:
585 ST 1,28(15) # R1 has offset into symbol table
586 L 1,4(12) # Get loader ino(object struct address)
587 ST 1,24(15) # Store address
588 L 1,8(12) # Entry address of loader in R1
589 BR 1 # Jump to loader
590
591 The first entry in the PLT for static code:
592
593 PLT0:
594 ST 1,28(15) # R1 has offset into symbol table
595 BASR 1,0
596 L 1,18(0,1) # Get address of GOT
597 MVC 24(4,15),4(1) # Move loader ino to stack
598 L 1,8(1) # Get address of loader
599 BR 1 # Jump to loader
600 .word 0 # filler
601 .long got # address of GOT */
602
603 #define PLT_PIC_FIRST_ENTRY_WORD0 0x5010f01c
604 #define PLT_PIC_FIRST_ENTRY_WORD1 0x5810c004
605 #define PLT_PIC_FIRST_ENTRY_WORD2 0x5010f018
606 #define PLT_PIC_FIRST_ENTRY_WORD3 0x5810c008
607 #define PLT_PIC_FIRST_ENTRY_WORD4 0x07f10000
608
609 #define PLT_FIRST_ENTRY_WORD0 0x5010f01c
610 #define PLT_FIRST_ENTRY_WORD1 0x0d105810
611 #define PLT_FIRST_ENTRY_WORD2 0x1012D203
612 #define PLT_FIRST_ENTRY_WORD3 0xf0181004
613 #define PLT_FIRST_ENTRY_WORD4 0x58101008
614 #define PLT_FIRST_ENTRY_WORD5 0x07f10000
615
616 /* The s390 linker needs to keep track of the number of relocs that it
617 decides to copy as dynamic relocs in check_relocs for each symbol.
618 This is so that it can later discard them if they are found to be
619 unnecessary. We store the information in a field extending the
620 regular ELF linker hash table. */
621
622 struct elf_s390_dyn_relocs
623 {
624 struct elf_s390_dyn_relocs *next;
625
626 /* The input section of the reloc. */
627 asection *sec;
628
629 /* Total number of relocs copied for the input section. */
630 bfd_size_type count;
631
632 /* Number of pc-relative relocs copied for the input section. */
633 bfd_size_type pc_count;
634 };
635
636 /* s390 ELF linker hash entry. */
637
638 struct elf_s390_link_hash_entry
639 {
640 struct elf_link_hash_entry elf;
641
642 /* Track dynamic relocs copied for this symbol. */
643 struct elf_s390_dyn_relocs *dyn_relocs;
644
645 /* Number of GOTPLT references for a function. */
646 bfd_signed_vma gotplt_refcount;
647
648 #define GOT_UNKNOWN 0
649 #define GOT_NORMAL 1
650 #define GOT_TLS_GD 2
651 #define GOT_TLS_IE 3
652 #define GOT_TLS_IE_NLT 4
653 unsigned char tls_type;
654 };
655
656 #define elf_s390_hash_entry(ent) \
657 ((struct elf_s390_link_hash_entry *)(ent))
658
659 struct elf_s390_obj_tdata
660 {
661 struct elf_obj_tdata root;
662
663 /* tls_type for each local got entry. */
664 char *local_got_tls_type;
665 };
666
667 #define elf_s390_tdata(abfd) \
668 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
669
670 #define elf_s390_local_got_tls_type(abfd) \
671 (elf_s390_tdata (abfd)->local_got_tls_type)
672
673 static bfd_boolean
674 elf_s390_mkobject (abfd)
675 bfd *abfd;
676 {
677 bfd_size_type amt = sizeof (struct elf_s390_obj_tdata);
678 abfd->tdata.any = bfd_zalloc (abfd, amt);
679 if (abfd->tdata.any == NULL)
680 return FALSE;
681 return TRUE;
682 }
683
684 static bfd_boolean
685 elf_s390_object_p (abfd)
686 bfd *abfd;
687 {
688 /* Set the right machine number for an s390 elf32 file. */
689 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31);
690 }
691
692 /* s390 ELF linker hash table. */
693
694 struct elf_s390_link_hash_table
695 {
696 struct elf_link_hash_table elf;
697
698 /* Short-cuts to get to dynamic linker sections. */
699 asection *sgot;
700 asection *sgotplt;
701 asection *srelgot;
702 asection *splt;
703 asection *srelplt;
704 asection *sdynbss;
705 asection *srelbss;
706
707 union {
708 bfd_signed_vma refcount;
709 bfd_vma offset;
710 } tls_ldm_got;
711
712 /* Small local sym to section mapping cache. */
713 struct sym_sec_cache sym_sec;
714 };
715
716 /* Get the s390 ELF linker hash table from a link_info structure. */
717
718 #define elf_s390_hash_table(p) \
719 ((struct elf_s390_link_hash_table *) ((p)->hash))
720
721 /* Create an entry in an s390 ELF linker hash table. */
722
723 static struct bfd_hash_entry *
724 link_hash_newfunc (entry, table, string)
725 struct bfd_hash_entry *entry;
726 struct bfd_hash_table *table;
727 const char *string;
728 {
729 /* Allocate the structure if it has not already been allocated by a
730 subclass. */
731 if (entry == NULL)
732 {
733 entry = bfd_hash_allocate (table,
734 sizeof (struct elf_s390_link_hash_entry));
735 if (entry == NULL)
736 return entry;
737 }
738
739 /* Call the allocation method of the superclass. */
740 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
741 if (entry != NULL)
742 {
743 struct elf_s390_link_hash_entry *eh;
744
745 eh = (struct elf_s390_link_hash_entry *) entry;
746 eh->dyn_relocs = NULL;
747 eh->gotplt_refcount = 0;
748 eh->tls_type = GOT_UNKNOWN;
749 }
750
751 return entry;
752 }
753
754 /* Create an s390 ELF linker hash table. */
755
756 static struct bfd_link_hash_table *
757 elf_s390_link_hash_table_create (abfd)
758 bfd *abfd;
759 {
760 struct elf_s390_link_hash_table *ret;
761 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
762
763 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
764 if (ret == NULL)
765 return NULL;
766
767 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
768 {
769 free (ret);
770 return NULL;
771 }
772
773 ret->sgot = NULL;
774 ret->sgotplt = NULL;
775 ret->srelgot = NULL;
776 ret->splt = NULL;
777 ret->srelplt = NULL;
778 ret->sdynbss = NULL;
779 ret->srelbss = NULL;
780 ret->tls_ldm_got.refcount = 0;
781 ret->sym_sec.abfd = NULL;
782
783 return &ret->elf.root;
784 }
785
786 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
787 shortcuts to them in our hash table. */
788
789 static bfd_boolean
790 create_got_section (dynobj, info)
791 bfd *dynobj;
792 struct bfd_link_info *info;
793 {
794 struct elf_s390_link_hash_table *htab;
795
796 if (! _bfd_elf_create_got_section (dynobj, info))
797 return FALSE;
798
799 htab = elf_s390_hash_table (info);
800 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
801 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
802 if (!htab->sgot || !htab->sgotplt)
803 abort ();
804
805 htab->srelgot = bfd_make_section (dynobj, ".rela.got");
806 if (htab->srelgot == NULL
807 || ! bfd_set_section_flags (dynobj, htab->srelgot,
808 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
809 | SEC_IN_MEMORY | SEC_LINKER_CREATED
810 | SEC_READONLY))
811 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
812 return FALSE;
813 return TRUE;
814 }
815
816 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
817 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
818 hash table. */
819
820 static bfd_boolean
821 elf_s390_create_dynamic_sections (dynobj, info)
822 bfd *dynobj;
823 struct bfd_link_info *info;
824 {
825 struct elf_s390_link_hash_table *htab;
826
827 htab = elf_s390_hash_table (info);
828 if (!htab->sgot && !create_got_section (dynobj, info))
829 return FALSE;
830
831 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
832 return FALSE;
833
834 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
835 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
836 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
837 if (!info->shared)
838 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
839
840 if (!htab->splt || !htab->srelplt || !htab->sdynbss
841 || (!info->shared && !htab->srelbss))
842 abort ();
843
844 return TRUE;
845 }
846
847 /* Copy the extra info we tack onto an elf_link_hash_entry. */
848
849 static void
850 elf_s390_copy_indirect_symbol (bed, dir, ind)
851 const struct elf_backend_data *bed;
852 struct elf_link_hash_entry *dir, *ind;
853 {
854 struct elf_s390_link_hash_entry *edir, *eind;
855
856 edir = (struct elf_s390_link_hash_entry *) dir;
857 eind = (struct elf_s390_link_hash_entry *) ind;
858
859 if (eind->dyn_relocs != NULL)
860 {
861 if (edir->dyn_relocs != NULL)
862 {
863 struct elf_s390_dyn_relocs **pp;
864 struct elf_s390_dyn_relocs *p;
865
866 if (ind->root.type == bfd_link_hash_indirect)
867 abort ();
868
869 /* Add reloc counts against the weak sym to the strong sym
870 list. Merge any entries against the same section. */
871 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
872 {
873 struct elf_s390_dyn_relocs *q;
874
875 for (q = edir->dyn_relocs; q != NULL; q = q->next)
876 if (q->sec == p->sec)
877 {
878 q->pc_count += p->pc_count;
879 q->count += p->count;
880 *pp = p->next;
881 break;
882 }
883 if (q == NULL)
884 pp = &p->next;
885 }
886 *pp = edir->dyn_relocs;
887 }
888
889 edir->dyn_relocs = eind->dyn_relocs;
890 eind->dyn_relocs = NULL;
891 }
892
893 if (ind->root.type == bfd_link_hash_indirect
894 && dir->got.refcount <= 0)
895 {
896 edir->tls_type = eind->tls_type;
897 eind->tls_type = GOT_UNKNOWN;
898 }
899
900 if (ELIMINATE_COPY_RELOCS
901 && ind->root.type != bfd_link_hash_indirect
902 && dir->dynamic_adjusted)
903 {
904 /* If called to transfer flags for a weakdef during processing
905 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
906 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
907 dir->ref_dynamic |= ind->ref_dynamic;
908 dir->ref_regular |= ind->ref_regular;
909 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
910 dir->needs_plt |= ind->needs_plt;
911 }
912 else
913 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
914 }
915
916 static int
917 elf_s390_tls_transition (info, r_type, is_local)
918 struct bfd_link_info *info;
919 int r_type;
920 int is_local;
921 {
922 if (info->shared)
923 return r_type;
924
925 switch (r_type)
926 {
927 case R_390_TLS_GD32:
928 case R_390_TLS_IE32:
929 if (is_local)
930 return R_390_TLS_LE32;
931 return R_390_TLS_IE32;
932 case R_390_TLS_GOTIE32:
933 if (is_local)
934 return R_390_TLS_LE32;
935 return R_390_TLS_GOTIE32;
936 case R_390_TLS_LDM32:
937 return R_390_TLS_LE32;
938 }
939
940 return r_type;
941 }
942
943 /* Look through the relocs for a section during the first phase, and
944 allocate space in the global offset table or procedure linkage
945 table. */
946
947 static bfd_boolean
948 elf_s390_check_relocs (abfd, info, sec, relocs)
949 bfd *abfd;
950 struct bfd_link_info *info;
951 asection *sec;
952 const Elf_Internal_Rela *relocs;
953 {
954 struct elf_s390_link_hash_table *htab;
955 Elf_Internal_Shdr *symtab_hdr;
956 struct elf_link_hash_entry **sym_hashes;
957 const Elf_Internal_Rela *rel;
958 const Elf_Internal_Rela *rel_end;
959 asection *sreloc;
960 bfd_signed_vma *local_got_refcounts;
961 int tls_type, old_tls_type;
962
963 if (info->relocatable)
964 return TRUE;
965
966 htab = elf_s390_hash_table (info);
967 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
968 sym_hashes = elf_sym_hashes (abfd);
969 local_got_refcounts = elf_local_got_refcounts (abfd);
970
971 sreloc = NULL;
972
973 rel_end = relocs + sec->reloc_count;
974 for (rel = relocs; rel < rel_end; rel++)
975 {
976 unsigned int r_type;
977 unsigned long r_symndx;
978 struct elf_link_hash_entry *h;
979
980 r_symndx = ELF32_R_SYM (rel->r_info);
981
982 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
983 {
984 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
985 abfd, r_symndx);
986 return FALSE;
987 }
988
989 if (r_symndx < symtab_hdr->sh_info)
990 h = NULL;
991 else
992 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
993
994 /* Create got section and local_got_refcounts array if they
995 are needed. */
996 r_type = elf_s390_tls_transition (info,
997 ELF32_R_TYPE (rel->r_info),
998 h == NULL);
999 switch (r_type)
1000 {
1001 case R_390_GOT12:
1002 case R_390_GOT16:
1003 case R_390_GOT20:
1004 case R_390_GOT32:
1005 case R_390_GOTENT:
1006 case R_390_GOTPLT12:
1007 case R_390_GOTPLT16:
1008 case R_390_GOTPLT20:
1009 case R_390_GOTPLT32:
1010 case R_390_GOTPLTENT:
1011 case R_390_TLS_GD32:
1012 case R_390_TLS_GOTIE12:
1013 case R_390_TLS_GOTIE20:
1014 case R_390_TLS_GOTIE32:
1015 case R_390_TLS_IEENT:
1016 case R_390_TLS_IE32:
1017 case R_390_TLS_LDM32:
1018 if (h == NULL
1019 && local_got_refcounts == NULL)
1020 {
1021 bfd_size_type size;
1022
1023 size = symtab_hdr->sh_info;
1024 size *= (sizeof (bfd_signed_vma) + sizeof(char));
1025 local_got_refcounts = ((bfd_signed_vma *)
1026 bfd_zalloc (abfd, size));
1027 if (local_got_refcounts == NULL)
1028 return FALSE;
1029 elf_local_got_refcounts (abfd) = local_got_refcounts;
1030 elf_s390_local_got_tls_type (abfd)
1031 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1032 }
1033 /* Fall through. */
1034 case R_390_GOTOFF16:
1035 case R_390_GOTOFF32:
1036 case R_390_GOTPC:
1037 case R_390_GOTPCDBL:
1038 if (htab->sgot == NULL)
1039 {
1040 if (htab->elf.dynobj == NULL)
1041 htab->elf.dynobj = abfd;
1042 if (!create_got_section (htab->elf.dynobj, info))
1043 return FALSE;
1044 }
1045 }
1046
1047 switch (r_type)
1048 {
1049 case R_390_GOTOFF16:
1050 case R_390_GOTOFF32:
1051 case R_390_GOTPC:
1052 case R_390_GOTPCDBL:
1053 /* Got is created, nothing to be done. */
1054 break;
1055
1056 case R_390_PLT16DBL:
1057 case R_390_PLT32DBL:
1058 case R_390_PLT32:
1059 case R_390_PLTOFF16:
1060 case R_390_PLTOFF32:
1061 /* This symbol requires a procedure linkage table entry. We
1062 actually build the entry in adjust_dynamic_symbol,
1063 because this might be a case of linking PIC code which is
1064 never referenced by a dynamic object, in which case we
1065 don't need to generate a procedure linkage table entry
1066 after all. */
1067
1068 /* If this is a local symbol, we resolve it directly without
1069 creating a procedure linkage table entry. */
1070 if (h != NULL)
1071 {
1072 h->needs_plt = 1;
1073 h->plt.refcount += 1;
1074 }
1075 break;
1076
1077 case R_390_GOTPLT12:
1078 case R_390_GOTPLT16:
1079 case R_390_GOTPLT20:
1080 case R_390_GOTPLT32:
1081 case R_390_GOTPLTENT:
1082 /* This symbol requires either a procedure linkage table entry
1083 or an entry in the local got. We actually build the entry
1084 in adjust_dynamic_symbol because whether this is really a
1085 global reference can change and with it the fact if we have
1086 to create a plt entry or a local got entry. To be able to
1087 make a once global symbol a local one we have to keep track
1088 of the number of gotplt references that exist for this
1089 symbol. */
1090 if (h != NULL)
1091 {
1092 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1093 h->needs_plt = 1;
1094 h->plt.refcount += 1;
1095 }
1096 else
1097 local_got_refcounts[r_symndx] += 1;
1098 break;
1099
1100 case R_390_TLS_LDM32:
1101 htab->tls_ldm_got.refcount += 1;
1102 break;
1103
1104 case R_390_TLS_IE32:
1105 case R_390_TLS_GOTIE12:
1106 case R_390_TLS_GOTIE20:
1107 case R_390_TLS_GOTIE32:
1108 case R_390_TLS_IEENT:
1109 if (info->shared)
1110 info->flags |= DF_STATIC_TLS;
1111 /* Fall through. */
1112
1113 case R_390_GOT12:
1114 case R_390_GOT16:
1115 case R_390_GOT20:
1116 case R_390_GOT32:
1117 case R_390_GOTENT:
1118 case R_390_TLS_GD32:
1119 /* This symbol requires a global offset table entry. */
1120 switch (r_type)
1121 {
1122 default:
1123 case R_390_GOT12:
1124 case R_390_GOT16:
1125 case R_390_GOT20:
1126 case R_390_GOT32:
1127 case R_390_GOTENT:
1128 tls_type = GOT_NORMAL;
1129 break;
1130 case R_390_TLS_GD32:
1131 tls_type = GOT_TLS_GD;
1132 break;
1133 case R_390_TLS_IE32:
1134 case R_390_TLS_GOTIE32:
1135 tls_type = GOT_TLS_IE;
1136 break;
1137 case R_390_TLS_GOTIE12:
1138 case R_390_TLS_GOTIE20:
1139 case R_390_TLS_IEENT:
1140 tls_type = GOT_TLS_IE_NLT;
1141 break;
1142 }
1143
1144 if (h != NULL)
1145 {
1146 h->got.refcount += 1;
1147 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1148 }
1149 else
1150 {
1151 local_got_refcounts[r_symndx] += 1;
1152 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1153 }
1154 /* If a TLS symbol is accessed using IE at least once,
1155 there is no point to use dynamic model for it. */
1156 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1157 {
1158 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1159 {
1160 (*_bfd_error_handler)
1161 (_("%B: `%s' accessed both as normal and thread local symbol"),
1162 abfd, h->root.root.string);
1163 return FALSE;
1164 }
1165 if (old_tls_type > tls_type)
1166 tls_type = old_tls_type;
1167 }
1168
1169 if (old_tls_type != tls_type)
1170 {
1171 if (h != NULL)
1172 elf_s390_hash_entry (h)->tls_type = tls_type;
1173 else
1174 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1175 }
1176
1177 if (r_type != R_390_TLS_IE32)
1178 break;
1179 /* Fall through. */
1180
1181 case R_390_TLS_LE32:
1182 if (!info->shared)
1183 break;
1184 info->flags |= DF_STATIC_TLS;
1185 /* Fall through. */
1186
1187 case R_390_8:
1188 case R_390_16:
1189 case R_390_32:
1190 case R_390_PC16:
1191 case R_390_PC16DBL:
1192 case R_390_PC32DBL:
1193 case R_390_PC32:
1194 if (h != NULL && !info->shared)
1195 {
1196 /* If this reloc is in a read-only section, we might
1197 need a copy reloc. We can't check reliably at this
1198 stage whether the section is read-only, as input
1199 sections have not yet been mapped to output sections.
1200 Tentatively set the flag for now, and correct in
1201 adjust_dynamic_symbol. */
1202 h->non_got_ref = 1;
1203
1204 /* We may need a .plt entry if the function this reloc
1205 refers to is in a shared lib. */
1206 h->plt.refcount += 1;
1207 }
1208
1209 /* If we are creating a shared library, and this is a reloc
1210 against a global symbol, or a non PC relative reloc
1211 against a local symbol, then we need to copy the reloc
1212 into the shared library. However, if we are linking with
1213 -Bsymbolic, we do not need to copy a reloc against a
1214 global symbol which is defined in an object we are
1215 including in the link (i.e., DEF_REGULAR is set). At
1216 this point we have not seen all the input files, so it is
1217 possible that DEF_REGULAR is not set now but will be set
1218 later (it is never cleared). In case of a weak definition,
1219 DEF_REGULAR may be cleared later by a strong definition in
1220 a shared library. We account for that possibility below by
1221 storing information in the relocs_copied field of the hash
1222 table entry. A similar situation occurs when creating
1223 shared libraries and symbol visibility changes render the
1224 symbol local.
1225
1226 If on the other hand, we are creating an executable, we
1227 may need to keep relocations for symbols satisfied by a
1228 dynamic library if we manage to avoid copy relocs for the
1229 symbol. */
1230 if ((info->shared
1231 && (sec->flags & SEC_ALLOC) != 0
1232 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16
1233 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL
1234 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL
1235 && ELF32_R_TYPE (rel->r_info) != R_390_PC32)
1236 || (h != NULL
1237 && (! info->symbolic
1238 || h->root.type == bfd_link_hash_defweak
1239 || !h->def_regular))))
1240 || (ELIMINATE_COPY_RELOCS
1241 && !info->shared
1242 && (sec->flags & SEC_ALLOC) != 0
1243 && h != NULL
1244 && (h->root.type == bfd_link_hash_defweak
1245 || !h->def_regular)))
1246 {
1247 struct elf_s390_dyn_relocs *p;
1248 struct elf_s390_dyn_relocs **head;
1249
1250 /* We must copy these reloc types into the output file.
1251 Create a reloc section in dynobj and make room for
1252 this reloc. */
1253 if (sreloc == NULL)
1254 {
1255 const char *name;
1256 bfd *dynobj;
1257
1258 name = (bfd_elf_string_from_elf_section
1259 (abfd,
1260 elf_elfheader (abfd)->e_shstrndx,
1261 elf_section_data (sec)->rel_hdr.sh_name));
1262 if (name == NULL)
1263 return FALSE;
1264
1265 if (strncmp (name, ".rela", 5) != 0
1266 || strcmp (bfd_get_section_name (abfd, sec),
1267 name + 5) != 0)
1268 {
1269 (*_bfd_error_handler)
1270 (_("%B: bad relocation section name `%s\'"),
1271 abfd, name);
1272 }
1273
1274 if (htab->elf.dynobj == NULL)
1275 htab->elf.dynobj = abfd;
1276
1277 dynobj = htab->elf.dynobj;
1278 sreloc = bfd_get_section_by_name (dynobj, name);
1279 if (sreloc == NULL)
1280 {
1281 flagword flags;
1282
1283 sreloc = bfd_make_section (dynobj, name);
1284 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1285 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1286 if ((sec->flags & SEC_ALLOC) != 0)
1287 flags |= SEC_ALLOC | SEC_LOAD;
1288 if (sreloc == NULL
1289 || ! bfd_set_section_flags (dynobj, sreloc, flags)
1290 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1291 return FALSE;
1292 }
1293 elf_section_data (sec)->sreloc = sreloc;
1294 }
1295
1296 /* If this is a global symbol, we count the number of
1297 relocations we need for this symbol. */
1298 if (h != NULL)
1299 {
1300 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1301 }
1302 else
1303 {
1304 /* Track dynamic relocs needed for local syms too.
1305 We really need local syms available to do this
1306 easily. Oh well. */
1307 asection *s;
1308
1309 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1310 sec, r_symndx);
1311 if (s == NULL)
1312 return FALSE;
1313
1314 head = ((struct elf_s390_dyn_relocs **)
1315 &elf_section_data (s)->local_dynrel);
1316 }
1317
1318 p = *head;
1319 if (p == NULL || p->sec != sec)
1320 {
1321 bfd_size_type amt = sizeof *p;
1322
1323 p = ((struct elf_s390_dyn_relocs *)
1324 bfd_alloc (htab->elf.dynobj, amt));
1325 if (p == NULL)
1326 return FALSE;
1327 p->next = *head;
1328 *head = p;
1329 p->sec = sec;
1330 p->count = 0;
1331 p->pc_count = 0;
1332 }
1333
1334 p->count += 1;
1335 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
1336 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
1337 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
1338 || ELF32_R_TYPE (rel->r_info) == R_390_PC32)
1339 p->pc_count += 1;
1340 }
1341 break;
1342
1343 /* This relocation describes the C++ object vtable hierarchy.
1344 Reconstruct it for later use during GC. */
1345 case R_390_GNU_VTINHERIT:
1346 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1347 return FALSE;
1348 break;
1349
1350 /* This relocation describes which C++ vtable entries are actually
1351 used. Record for later use during GC. */
1352 case R_390_GNU_VTENTRY:
1353 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1354 return FALSE;
1355 break;
1356
1357 default:
1358 break;
1359 }
1360 }
1361
1362 return TRUE;
1363 }
1364
1365 /* Return the section that should be marked against GC for a given
1366 relocation. */
1367
1368 static asection *
1369 elf_s390_gc_mark_hook (sec, info, rel, h, sym)
1370 asection *sec;
1371 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1372 Elf_Internal_Rela *rel;
1373 struct elf_link_hash_entry *h;
1374 Elf_Internal_Sym *sym;
1375 {
1376 if (h != NULL)
1377 {
1378 switch (ELF32_R_TYPE (rel->r_info))
1379 {
1380 case R_390_GNU_VTINHERIT:
1381 case R_390_GNU_VTENTRY:
1382 break;
1383
1384 default:
1385 switch (h->root.type)
1386 {
1387 case bfd_link_hash_defined:
1388 case bfd_link_hash_defweak:
1389 return h->root.u.def.section;
1390
1391 case bfd_link_hash_common:
1392 return h->root.u.c.p->section;
1393
1394 default:
1395 break;
1396 }
1397 }
1398 }
1399 else
1400 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1401
1402 return NULL;
1403 }
1404
1405 /* Update the got entry reference counts for the section being removed. */
1406
1407 static bfd_boolean
1408 elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
1409 bfd *abfd;
1410 struct bfd_link_info *info;
1411 asection *sec;
1412 const Elf_Internal_Rela *relocs;
1413 {
1414 Elf_Internal_Shdr *symtab_hdr;
1415 struct elf_link_hash_entry **sym_hashes;
1416 bfd_signed_vma *local_got_refcounts;
1417 const Elf_Internal_Rela *rel, *relend;
1418
1419 elf_section_data (sec)->local_dynrel = NULL;
1420
1421 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1422 sym_hashes = elf_sym_hashes (abfd);
1423 local_got_refcounts = elf_local_got_refcounts (abfd);
1424
1425 relend = relocs + sec->reloc_count;
1426 for (rel = relocs; rel < relend; rel++)
1427 {
1428 unsigned long r_symndx;
1429 unsigned int r_type;
1430 struct elf_link_hash_entry *h = NULL;
1431
1432 r_symndx = ELF32_R_SYM (rel->r_info);
1433 if (r_symndx >= symtab_hdr->sh_info)
1434 {
1435 struct elf_s390_link_hash_entry *eh;
1436 struct elf_s390_dyn_relocs **pp;
1437 struct elf_s390_dyn_relocs *p;
1438
1439 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1440 eh = (struct elf_s390_link_hash_entry *) h;
1441
1442 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1443 if (p->sec == sec)
1444 {
1445 /* Everything must go for SEC. */
1446 *pp = p->next;
1447 break;
1448 }
1449 }
1450
1451 r_type = ELF32_R_TYPE (rel->r_info);
1452 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1453 switch (r_type)
1454 {
1455 case R_390_TLS_LDM32:
1456 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1457 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1458 break;
1459
1460 case R_390_TLS_GD32:
1461 case R_390_TLS_IE32:
1462 case R_390_TLS_GOTIE12:
1463 case R_390_TLS_GOTIE20:
1464 case R_390_TLS_GOTIE32:
1465 case R_390_TLS_IEENT:
1466 case R_390_GOT12:
1467 case R_390_GOT16:
1468 case R_390_GOT20:
1469 case R_390_GOT32:
1470 case R_390_GOTOFF16:
1471 case R_390_GOTOFF32:
1472 case R_390_GOTPC:
1473 case R_390_GOTPCDBL:
1474 case R_390_GOTENT:
1475 if (h != NULL)
1476 {
1477 if (h->got.refcount > 0)
1478 h->got.refcount -= 1;
1479 }
1480 else if (local_got_refcounts != NULL)
1481 {
1482 if (local_got_refcounts[r_symndx] > 0)
1483 local_got_refcounts[r_symndx] -= 1;
1484 }
1485 break;
1486
1487 case R_390_8:
1488 case R_390_12:
1489 case R_390_16:
1490 case R_390_20:
1491 case R_390_32:
1492 case R_390_PC16:
1493 case R_390_PC16DBL:
1494 case R_390_PC32DBL:
1495 case R_390_PC32:
1496 if (info->shared)
1497 break;
1498 /* Fall through. */
1499
1500 case R_390_PLT16DBL:
1501 case R_390_PLT32DBL:
1502 case R_390_PLT32:
1503 case R_390_PLTOFF16:
1504 case R_390_PLTOFF32:
1505 if (h != NULL)
1506 {
1507 if (h->plt.refcount > 0)
1508 h->plt.refcount -= 1;
1509 }
1510 break;
1511
1512 case R_390_GOTPLT12:
1513 case R_390_GOTPLT16:
1514 case R_390_GOTPLT20:
1515 case R_390_GOTPLT32:
1516 case R_390_GOTPLTENT:
1517 if (h != NULL)
1518 {
1519 if (h->plt.refcount > 0)
1520 {
1521 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1522 h->plt.refcount -= 1;
1523 }
1524 }
1525 else if (local_got_refcounts != NULL)
1526 {
1527 if (local_got_refcounts[r_symndx] > 0)
1528 local_got_refcounts[r_symndx] -= 1;
1529 }
1530 break;
1531
1532 default:
1533 break;
1534 }
1535 }
1536
1537 return TRUE;
1538 }
1539
1540 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1541 entry but we found we will not create any. Called when we find we will
1542 not have any PLT for this symbol, by for example
1543 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1544 or elf_s390_size_dynamic_sections if no dynamic sections will be
1545 created (we're only linking static objects). */
1546
1547 static void
1548 elf_s390_adjust_gotplt (h)
1549 struct elf_s390_link_hash_entry *h;
1550 {
1551 if (h->elf.root.type == bfd_link_hash_warning)
1552 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1553
1554 if (h->gotplt_refcount <= 0)
1555 return;
1556
1557 /* We simply add the number of gotplt references to the number
1558 * of got references for this symbol. */
1559 h->elf.got.refcount += h->gotplt_refcount;
1560 h->gotplt_refcount = -1;
1561 }
1562
1563 /* Adjust a symbol defined by a dynamic object and referenced by a
1564 regular object. The current definition is in some section of the
1565 dynamic object, but we're not including those sections. We have to
1566 change the definition to something the rest of the link can
1567 understand. */
1568
1569 static bfd_boolean
1570 elf_s390_adjust_dynamic_symbol (info, h)
1571 struct bfd_link_info *info;
1572 struct elf_link_hash_entry *h;
1573 {
1574 struct elf_s390_link_hash_table *htab;
1575 asection *s;
1576 unsigned int power_of_two;
1577
1578 /* If this is a function, put it in the procedure linkage table. We
1579 will fill in the contents of the procedure linkage table later
1580 (although we could actually do it here). */
1581 if (h->type == STT_FUNC
1582 || h->needs_plt)
1583 {
1584 if (h->plt.refcount <= 0
1585 || (! info->shared
1586 && !h->def_dynamic
1587 && !h->ref_dynamic
1588 && h->root.type != bfd_link_hash_undefweak
1589 && h->root.type != bfd_link_hash_undefined))
1590 {
1591 /* This case can occur if we saw a PLT32 reloc in an input
1592 file, but the symbol was never referred to by a dynamic
1593 object, or if all references were garbage collected. In
1594 such a case, we don't actually need to build a procedure
1595 linkage table, and we can just do a PC32 reloc instead. */
1596 h->plt.offset = (bfd_vma) -1;
1597 h->needs_plt = 0;
1598 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1599 }
1600
1601 return TRUE;
1602 }
1603 else
1604 /* It's possible that we incorrectly decided a .plt reloc was
1605 needed for an R_390_PC32 reloc to a non-function sym in
1606 check_relocs. We can't decide accurately between function and
1607 non-function syms in check-relocs; Objects loaded later in
1608 the link may change h->type. So fix it now. */
1609 h->plt.offset = (bfd_vma) -1;
1610
1611 /* If this is a weak symbol, and there is a real definition, the
1612 processor independent code will have arranged for us to see the
1613 real definition first, and we can just use the same value. */
1614 if (h->u.weakdef != NULL)
1615 {
1616 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1617 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1618 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1619 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1620 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1621 h->non_got_ref = h->u.weakdef->non_got_ref;
1622 return TRUE;
1623 }
1624
1625 /* This is a reference to a symbol defined by a dynamic object which
1626 is not a function. */
1627
1628 /* If we are creating a shared library, we must presume that the
1629 only references to the symbol are via the global offset table.
1630 For such cases we need not do anything here; the relocations will
1631 be handled correctly by relocate_section. */
1632 if (info->shared)
1633 return TRUE;
1634
1635 /* If there are no references to this symbol that do not use the
1636 GOT, we don't need to generate a copy reloc. */
1637 if (!h->non_got_ref)
1638 return TRUE;
1639
1640 /* If -z nocopyreloc was given, we won't generate them either. */
1641 if (info->nocopyreloc)
1642 {
1643 h->non_got_ref = 0;
1644 return TRUE;
1645 }
1646
1647 if (ELIMINATE_COPY_RELOCS)
1648 {
1649 struct elf_s390_link_hash_entry * eh;
1650 struct elf_s390_dyn_relocs *p;
1651
1652 eh = (struct elf_s390_link_hash_entry *) h;
1653 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1654 {
1655 s = p->sec->output_section;
1656 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1657 break;
1658 }
1659
1660 /* If we didn't find any dynamic relocs in read-only sections, then
1661 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1662 if (p == NULL)
1663 {
1664 h->non_got_ref = 0;
1665 return TRUE;
1666 }
1667 }
1668
1669 /* We must allocate the symbol in our .dynbss section, which will
1670 become part of the .bss section of the executable. There will be
1671 an entry for this symbol in the .dynsym section. The dynamic
1672 object will contain position independent code, so all references
1673 from the dynamic object to this symbol will go through the global
1674 offset table. The dynamic linker will use the .dynsym entry to
1675 determine the address it must put in the global offset table, so
1676 both the dynamic object and the regular object will refer to the
1677 same memory location for the variable. */
1678
1679 htab = elf_s390_hash_table (info);
1680
1681 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1682 copy the initial value out of the dynamic object and into the
1683 runtime process image. */
1684 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1685 {
1686 htab->srelbss->size += sizeof (Elf32_External_Rela);
1687 h->needs_copy = 1;
1688 }
1689
1690 /* We need to figure out the alignment required for this symbol. I
1691 have no idea how ELF linkers handle this. */
1692 power_of_two = bfd_log2 (h->size);
1693 if (power_of_two > 3)
1694 power_of_two = 3;
1695
1696 /* Apply the required alignment. */
1697 s = htab->sdynbss;
1698 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1699 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1700 {
1701 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1702 return FALSE;
1703 }
1704
1705 /* Define the symbol as being at this point in the section. */
1706 h->root.u.def.section = s;
1707 h->root.u.def.value = s->size;
1708
1709 /* Increment the section size to make room for the symbol. */
1710 s->size += h->size;
1711
1712 return TRUE;
1713 }
1714
1715 /* Allocate space in .plt, .got and associated reloc sections for
1716 dynamic relocs. */
1717
1718 static bfd_boolean
1719 allocate_dynrelocs (h, inf)
1720 struct elf_link_hash_entry *h;
1721 PTR inf;
1722 {
1723 struct bfd_link_info *info;
1724 struct elf_s390_link_hash_table *htab;
1725 struct elf_s390_link_hash_entry *eh;
1726 struct elf_s390_dyn_relocs *p;
1727
1728 if (h->root.type == bfd_link_hash_indirect)
1729 return TRUE;
1730
1731 if (h->root.type == bfd_link_hash_warning)
1732 /* When warning symbols are created, they **replace** the "real"
1733 entry in the hash table, thus we never get to see the real
1734 symbol in a hash traversal. So look at it now. */
1735 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1736
1737 info = (struct bfd_link_info *) inf;
1738 htab = elf_s390_hash_table (info);
1739
1740 if (htab->elf.dynamic_sections_created
1741 && h->plt.refcount > 0
1742 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1743 || h->root.type != bfd_link_hash_undefweak))
1744 {
1745 /* Make sure this symbol is output as a dynamic symbol.
1746 Undefined weak syms won't yet be marked as dynamic. */
1747 if (h->dynindx == -1
1748 && !h->forced_local)
1749 {
1750 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1751 return FALSE;
1752 }
1753
1754 if (info->shared
1755 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1756 {
1757 asection *s = htab->splt;
1758
1759 /* If this is the first .plt entry, make room for the special
1760 first entry. */
1761 if (s->size == 0)
1762 s->size += PLT_FIRST_ENTRY_SIZE;
1763
1764 h->plt.offset = s->size;
1765
1766 /* If this symbol is not defined in a regular file, and we are
1767 not generating a shared library, then set the symbol to this
1768 location in the .plt. This is required to make function
1769 pointers compare as equal between the normal executable and
1770 the shared library. */
1771 if (! info->shared
1772 && !h->def_regular)
1773 {
1774 h->root.u.def.section = s;
1775 h->root.u.def.value = h->plt.offset;
1776 }
1777
1778 /* Make room for this entry. */
1779 s->size += PLT_ENTRY_SIZE;
1780
1781 /* We also need to make an entry in the .got.plt section, which
1782 will be placed in the .got section by the linker script. */
1783 htab->sgotplt->size += GOT_ENTRY_SIZE;
1784
1785 /* We also need to make an entry in the .rela.plt section. */
1786 htab->srelplt->size += sizeof (Elf32_External_Rela);
1787 }
1788 else
1789 {
1790 h->plt.offset = (bfd_vma) -1;
1791 h->needs_plt = 0;
1792 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1793 }
1794 }
1795 else
1796 {
1797 h->plt.offset = (bfd_vma) -1;
1798 h->needs_plt = 0;
1799 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1800 }
1801
1802 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to
1803 the binary, we can optimize a bit. IE32 and GOTIE32 get converted
1804 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT
1805 we can save the dynamic TLS relocation. */
1806 if (h->got.refcount > 0
1807 && !info->shared
1808 && h->dynindx == -1
1809 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1810 {
1811 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1812 /* For the GOTIE access without a literal pool entry the offset has
1813 to be stored somewhere. The immediate value in the instruction
1814 is not bit enough so the value is stored in the got. */
1815 {
1816 h->got.offset = htab->sgot->size;
1817 htab->sgot->size += GOT_ENTRY_SIZE;
1818 }
1819 else
1820 h->got.offset = (bfd_vma) -1;
1821 }
1822 else if (h->got.refcount > 0)
1823 {
1824 asection *s;
1825 bfd_boolean dyn;
1826 int tls_type = elf_s390_hash_entry(h)->tls_type;
1827
1828 /* Make sure this symbol is output as a dynamic symbol.
1829 Undefined weak syms won't yet be marked as dynamic. */
1830 if (h->dynindx == -1
1831 && !h->forced_local)
1832 {
1833 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1834 return FALSE;
1835 }
1836
1837 s = htab->sgot;
1838 h->got.offset = s->size;
1839 s->size += GOT_ENTRY_SIZE;
1840 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */
1841 if (tls_type == GOT_TLS_GD)
1842 s->size += GOT_ENTRY_SIZE;
1843 dyn = htab->elf.dynamic_sections_created;
1844 /* R_390_TLS_IE32 needs one dynamic relocation,
1845 R_390_TLS_GD32 needs one if local symbol and two if global. */
1846 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1847 || tls_type >= GOT_TLS_IE)
1848 htab->srelgot->size += sizeof (Elf32_External_Rela);
1849 else if (tls_type == GOT_TLS_GD)
1850 htab->srelgot->size += 2 * sizeof (Elf32_External_Rela);
1851 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1852 || h->root.type != bfd_link_hash_undefweak)
1853 && (info->shared
1854 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1855 htab->srelgot->size += sizeof (Elf32_External_Rela);
1856 }
1857 else
1858 h->got.offset = (bfd_vma) -1;
1859
1860 eh = (struct elf_s390_link_hash_entry *) h;
1861 if (eh->dyn_relocs == NULL)
1862 return TRUE;
1863
1864 /* In the shared -Bsymbolic case, discard space allocated for
1865 dynamic pc-relative relocs against symbols which turn out to be
1866 defined in regular objects. For the normal shared case, discard
1867 space for pc-relative relocs that have become local due to symbol
1868 visibility changes. */
1869
1870 if (info->shared)
1871 {
1872 if (SYMBOL_REFERENCES_LOCAL (info, h))
1873 {
1874 struct elf_s390_dyn_relocs **pp;
1875
1876 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1877 {
1878 p->count -= p->pc_count;
1879 p->pc_count = 0;
1880 if (p->count == 0)
1881 *pp = p->next;
1882 else
1883 pp = &p->next;
1884 }
1885 }
1886
1887 /* Also discard relocs on undefined weak syms with non-default
1888 visibility. */
1889 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1890 && h->root.type == bfd_link_hash_undefweak)
1891 eh->dyn_relocs = NULL;
1892 }
1893 else if (ELIMINATE_COPY_RELOCS)
1894 {
1895 /* For the non-shared case, discard space for relocs against
1896 symbols which turn out to need copy relocs or are not
1897 dynamic. */
1898
1899 if (!h->non_got_ref
1900 && ((h->def_dynamic
1901 && !h->def_regular)
1902 || (htab->elf.dynamic_sections_created
1903 && (h->root.type == bfd_link_hash_undefweak
1904 || h->root.type == bfd_link_hash_undefined))))
1905 {
1906 /* Make sure this symbol is output as a dynamic symbol.
1907 Undefined weak syms won't yet be marked as dynamic. */
1908 if (h->dynindx == -1
1909 && !h->forced_local)
1910 {
1911 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1912 return FALSE;
1913 }
1914
1915 /* If that succeeded, we know we'll be keeping all the
1916 relocs. */
1917 if (h->dynindx != -1)
1918 goto keep;
1919 }
1920
1921 eh->dyn_relocs = NULL;
1922
1923 keep: ;
1924 }
1925
1926 /* Finally, allocate space. */
1927 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1928 {
1929 asection *sreloc = elf_section_data (p->sec)->sreloc;
1930
1931 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1932 }
1933
1934 return TRUE;
1935 }
1936
1937 /* Find any dynamic relocs that apply to read-only sections. */
1938
1939 static bfd_boolean
1940 readonly_dynrelocs (h, inf)
1941 struct elf_link_hash_entry *h;
1942 PTR inf;
1943 {
1944 struct elf_s390_link_hash_entry *eh;
1945 struct elf_s390_dyn_relocs *p;
1946
1947 if (h->root.type == bfd_link_hash_warning)
1948 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1949
1950 eh = (struct elf_s390_link_hash_entry *) h;
1951 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1952 {
1953 asection *s = p->sec->output_section;
1954
1955 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1956 {
1957 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1958
1959 info->flags |= DF_TEXTREL;
1960
1961 /* Not an error, just cut short the traversal. */
1962 return FALSE;
1963 }
1964 }
1965 return TRUE;
1966 }
1967
1968 /* Set the sizes of the dynamic sections. */
1969
1970 static bfd_boolean
1971 elf_s390_size_dynamic_sections (output_bfd, info)
1972 bfd *output_bfd ATTRIBUTE_UNUSED;
1973 struct bfd_link_info *info;
1974 {
1975 struct elf_s390_link_hash_table *htab;
1976 bfd *dynobj;
1977 asection *s;
1978 bfd_boolean relocs;
1979 bfd *ibfd;
1980
1981 htab = elf_s390_hash_table (info);
1982 dynobj = htab->elf.dynobj;
1983 if (dynobj == NULL)
1984 abort ();
1985
1986 if (htab->elf.dynamic_sections_created)
1987 {
1988 /* Set the contents of the .interp section to the interpreter. */
1989 if (info->executable)
1990 {
1991 s = bfd_get_section_by_name (dynobj, ".interp");
1992 if (s == NULL)
1993 abort ();
1994 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1995 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1996 }
1997 }
1998
1999 /* Set up .got offsets for local syms, and space for local dynamic
2000 relocs. */
2001 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2002 {
2003 bfd_signed_vma *local_got;
2004 bfd_signed_vma *end_local_got;
2005 char *local_tls_type;
2006 bfd_size_type locsymcount;
2007 Elf_Internal_Shdr *symtab_hdr;
2008 asection *srela;
2009
2010 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
2011 continue;
2012
2013 for (s = ibfd->sections; s != NULL; s = s->next)
2014 {
2015 struct elf_s390_dyn_relocs *p;
2016
2017 for (p = *((struct elf_s390_dyn_relocs **)
2018 &elf_section_data (s)->local_dynrel);
2019 p != NULL;
2020 p = p->next)
2021 {
2022 if (!bfd_is_abs_section (p->sec)
2023 && bfd_is_abs_section (p->sec->output_section))
2024 {
2025 /* Input section has been discarded, either because
2026 it is a copy of a linkonce section or due to
2027 linker script /DISCARD/, so we'll be discarding
2028 the relocs too. */
2029 }
2030 else if (p->count != 0)
2031 {
2032 srela = elf_section_data (p->sec)->sreloc;
2033 srela->size += p->count * sizeof (Elf32_External_Rela);
2034 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2035 info->flags |= DF_TEXTREL;
2036 }
2037 }
2038 }
2039
2040 local_got = elf_local_got_refcounts (ibfd);
2041 if (!local_got)
2042 continue;
2043
2044 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2045 locsymcount = symtab_hdr->sh_info;
2046 end_local_got = local_got + locsymcount;
2047 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2048 s = htab->sgot;
2049 srela = htab->srelgot;
2050 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2051 {
2052 if (*local_got > 0)
2053 {
2054 *local_got = s->size;
2055 s->size += GOT_ENTRY_SIZE;
2056 if (*local_tls_type == GOT_TLS_GD)
2057 s->size += GOT_ENTRY_SIZE;
2058 if (info->shared)
2059 srela->size += sizeof (Elf32_External_Rela);
2060 }
2061 else
2062 *local_got = (bfd_vma) -1;
2063 }
2064 }
2065
2066 if (htab->tls_ldm_got.refcount > 0)
2067 {
2068 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32
2069 relocs. */
2070 htab->tls_ldm_got.offset = htab->sgot->size;
2071 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2072 htab->srelgot->size += sizeof (Elf32_External_Rela);
2073 }
2074 else
2075 htab->tls_ldm_got.offset = -1;
2076
2077 /* Allocate global sym .plt and .got entries, and space for global
2078 sym dynamic relocs. */
2079 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2080
2081 /* We now have determined the sizes of the various dynamic sections.
2082 Allocate memory for them. */
2083 relocs = FALSE;
2084 for (s = dynobj->sections; s != NULL; s = s->next)
2085 {
2086 if ((s->flags & SEC_LINKER_CREATED) == 0)
2087 continue;
2088
2089 if (s == htab->splt
2090 || s == htab->sgot
2091 || s == htab->sgotplt)
2092 {
2093 /* Strip this section if we don't need it; see the
2094 comment below. */
2095 }
2096 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
2097 {
2098 if (s->size != 0)
2099 relocs = TRUE;
2100
2101 /* We use the reloc_count field as a counter if we need
2102 to copy relocs into the output file. */
2103 s->reloc_count = 0;
2104 }
2105 else
2106 {
2107 /* It's not one of our sections, so don't allocate space. */
2108 continue;
2109 }
2110
2111 if (s->size == 0)
2112 {
2113 /* If we don't need this section, strip it from the
2114 output file. This is to handle .rela.bss and
2115 .rela.plt. We must create it in
2116 create_dynamic_sections, because it must be created
2117 before the linker maps input sections to output
2118 sections. The linker does that before
2119 adjust_dynamic_symbol is called, and it is that
2120 function which decides whether anything needs to go
2121 into these sections. */
2122
2123 _bfd_strip_section_from_output (info, s);
2124 continue;
2125 }
2126
2127 /* Allocate memory for the section contents. We use bfd_zalloc
2128 here in case unused entries are not reclaimed before the
2129 section's contents are written out. This should not happen,
2130 but this way if it does, we get a R_390_NONE reloc instead
2131 of garbage. */
2132 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2133 if (s->contents == NULL)
2134 return FALSE;
2135 }
2136
2137 if (htab->elf.dynamic_sections_created)
2138 {
2139 /* Add some entries to the .dynamic section. We fill in the
2140 values later, in elf_s390_finish_dynamic_sections, but we
2141 must add the entries now so that we get the correct size for
2142 the .dynamic section. The DT_DEBUG entry is filled in by the
2143 dynamic linker and used by the debugger. */
2144 #define add_dynamic_entry(TAG, VAL) \
2145 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2146
2147 if (info->executable)
2148 {
2149 if (!add_dynamic_entry (DT_DEBUG, 0))
2150 return FALSE;
2151 }
2152
2153 if (htab->splt->size != 0)
2154 {
2155 if (!add_dynamic_entry (DT_PLTGOT, 0)
2156 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2157 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2158 || !add_dynamic_entry (DT_JMPREL, 0))
2159 return FALSE;
2160 }
2161
2162 if (relocs)
2163 {
2164 if (!add_dynamic_entry (DT_RELA, 0)
2165 || !add_dynamic_entry (DT_RELASZ, 0)
2166 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2167 return FALSE;
2168
2169 /* If any dynamic relocs apply to a read-only section,
2170 then we need a DT_TEXTREL entry. */
2171 if ((info->flags & DF_TEXTREL) == 0)
2172 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2173 (PTR) info);
2174
2175 if ((info->flags & DF_TEXTREL) != 0)
2176 {
2177 if (!add_dynamic_entry (DT_TEXTREL, 0))
2178 return FALSE;
2179 }
2180 }
2181 }
2182 #undef add_dynamic_entry
2183
2184 return TRUE;
2185 }
2186
2187 /* Return the base VMA address which should be subtracted from real addresses
2188 when resolving @dtpoff relocation.
2189 This is PT_TLS segment p_vaddr. */
2190
2191 static bfd_vma
2192 dtpoff_base (info)
2193 struct bfd_link_info *info;
2194 {
2195 /* If tls_sec is NULL, we should have signalled an error already. */
2196 if (elf_hash_table (info)->tls_sec == NULL)
2197 return 0;
2198 return elf_hash_table (info)->tls_sec->vma;
2199 }
2200
2201 /* Return the relocation value for @tpoff relocation
2202 if STT_TLS virtual address is ADDRESS. */
2203
2204 static bfd_vma
2205 tpoff (info, address)
2206 struct bfd_link_info *info;
2207 bfd_vma address;
2208 {
2209 struct elf_link_hash_table *htab = elf_hash_table (info);
2210
2211 /* If tls_sec is NULL, we should have signalled an error already. */
2212 if (htab->tls_sec == NULL)
2213 return 0;
2214 return htab->tls_size + htab->tls_sec->vma - address;
2215 }
2216
2217 /* Complain if TLS instruction relocation is against an invalid
2218 instruction. */
2219
2220 static void
2221 invalid_tls_insn (input_bfd, input_section, rel)
2222 bfd *input_bfd;
2223 asection *input_section;
2224 Elf_Internal_Rela *rel;
2225 {
2226 reloc_howto_type *howto;
2227
2228 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info);
2229 (*_bfd_error_handler)
2230 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2231 input_bfd,
2232 input_section,
2233 (long) rel->r_offset,
2234 howto->name);
2235 }
2236
2237 /* Relocate a 390 ELF section. */
2238
2239 static bfd_boolean
2240 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2241 contents, relocs, local_syms, local_sections)
2242 bfd *output_bfd;
2243 struct bfd_link_info *info;
2244 bfd *input_bfd;
2245 asection *input_section;
2246 bfd_byte *contents;
2247 Elf_Internal_Rela *relocs;
2248 Elf_Internal_Sym *local_syms;
2249 asection **local_sections;
2250 {
2251 struct elf_s390_link_hash_table *htab;
2252 Elf_Internal_Shdr *symtab_hdr;
2253 struct elf_link_hash_entry **sym_hashes;
2254 bfd_vma *local_got_offsets;
2255 Elf_Internal_Rela *rel;
2256 Elf_Internal_Rela *relend;
2257
2258 if (info->relocatable)
2259 return TRUE;
2260
2261 htab = elf_s390_hash_table (info);
2262 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2263 sym_hashes = elf_sym_hashes (input_bfd);
2264 local_got_offsets = elf_local_got_offsets (input_bfd);
2265
2266 rel = relocs;
2267 relend = relocs + input_section->reloc_count;
2268 for (; rel < relend; rel++)
2269 {
2270 unsigned int r_type;
2271 reloc_howto_type *howto;
2272 unsigned long r_symndx;
2273 struct elf_link_hash_entry *h;
2274 Elf_Internal_Sym *sym;
2275 asection *sec;
2276 bfd_vma off;
2277 bfd_vma relocation;
2278 bfd_boolean unresolved_reloc;
2279 bfd_reloc_status_type r;
2280 int tls_type;
2281
2282 r_type = ELF32_R_TYPE (rel->r_info);
2283 if (r_type == (int) R_390_GNU_VTINHERIT
2284 || r_type == (int) R_390_GNU_VTENTRY)
2285 continue;
2286 if (r_type >= (int) R_390_max)
2287 {
2288 bfd_set_error (bfd_error_bad_value);
2289 return FALSE;
2290 }
2291
2292 howto = elf_howto_table + r_type;
2293 r_symndx = ELF32_R_SYM (rel->r_info);
2294
2295 /* This is a final link. */
2296 h = NULL;
2297 sym = NULL;
2298 sec = NULL;
2299 unresolved_reloc = FALSE;
2300 if (r_symndx < symtab_hdr->sh_info)
2301 {
2302 sym = local_syms + r_symndx;
2303 sec = local_sections[r_symndx];
2304 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2305 }
2306 else
2307 {
2308 bfd_boolean warned ATTRIBUTE_UNUSED;
2309
2310 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2311 r_symndx, symtab_hdr, sym_hashes,
2312 h, sec, relocation,
2313 unresolved_reloc, warned);
2314 }
2315
2316 switch (r_type)
2317 {
2318 case R_390_GOTPLT12:
2319 case R_390_GOTPLT16:
2320 case R_390_GOTPLT20:
2321 case R_390_GOTPLT32:
2322 case R_390_GOTPLTENT:
2323 /* There are three cases for a GOTPLT relocation. 1) The
2324 relocation is against the jump slot entry of a plt that
2325 will get emitted to the output file. 2) The relocation
2326 is against the jump slot of a plt entry that has been
2327 removed. elf_s390_adjust_gotplt has created a GOT entry
2328 as replacement. 3) The relocation is against a local symbol.
2329 Cases 2) and 3) are the same as the GOT relocation code
2330 so we just have to test for case 1 and fall through for
2331 the other two. */
2332 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2333 {
2334 bfd_vma plt_index;
2335
2336 /* Calc. index no.
2337 Current offset - size first entry / entry size. */
2338 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2339 PLT_ENTRY_SIZE;
2340
2341 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2342 addr & GOT addr. */
2343 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2344 unresolved_reloc = FALSE;
2345
2346 if (r_type == R_390_GOTPLTENT)
2347 relocation += htab->sgot->output_section->vma;
2348 break;
2349 }
2350 /* Fall through. */
2351
2352 case R_390_GOT12:
2353 case R_390_GOT16:
2354 case R_390_GOT20:
2355 case R_390_GOT32:
2356 case R_390_GOTENT:
2357 /* Relocation is to the entry for this symbol in the global
2358 offset table. */
2359 if (htab->sgot == NULL)
2360 abort ();
2361
2362 if (h != NULL)
2363 {
2364 bfd_boolean dyn;
2365
2366 off = h->got.offset;
2367 dyn = htab->elf.dynamic_sections_created;
2368 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2369 || (info->shared
2370 && (info->symbolic
2371 || h->dynindx == -1
2372 || h->forced_local)
2373 && h->def_regular)
2374 || (ELF_ST_VISIBILITY (h->other)
2375 && h->root.type == bfd_link_hash_undefweak))
2376 {
2377 /* This is actually a static link, or it is a
2378 -Bsymbolic link and the symbol is defined
2379 locally, or the symbol was forced to be local
2380 because of a version file. We must initialize
2381 this entry in the global offset table. Since the
2382 offset must always be a multiple of 2, we use the
2383 least significant bit to record whether we have
2384 initialized it already.
2385
2386 When doing a dynamic link, we create a .rel.got
2387 relocation entry to initialize the value. This
2388 is done in the finish_dynamic_symbol routine. */
2389 if ((off & 1) != 0)
2390 off &= ~1;
2391 else
2392 {
2393 bfd_put_32 (output_bfd, relocation,
2394 htab->sgot->contents + off);
2395 h->got.offset |= 1;
2396 }
2397 }
2398 else
2399 unresolved_reloc = FALSE;
2400 }
2401 else
2402 {
2403 if (local_got_offsets == NULL)
2404 abort ();
2405
2406 off = local_got_offsets[r_symndx];
2407
2408 /* The offset must always be a multiple of 4. We use
2409 the least significant bit to record whether we have
2410 already generated the necessary reloc. */
2411 if ((off & 1) != 0)
2412 off &= ~1;
2413 else
2414 {
2415 bfd_put_32 (output_bfd, relocation,
2416 htab->sgot->contents + off);
2417
2418 if (info->shared)
2419 {
2420 asection *srelgot;
2421 Elf_Internal_Rela outrel;
2422 bfd_byte *loc;
2423
2424 srelgot = htab->srelgot;
2425 if (srelgot == NULL)
2426 abort ();
2427
2428 outrel.r_offset = (htab->sgot->output_section->vma
2429 + htab->sgot->output_offset
2430 + off);
2431 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2432 outrel.r_addend = relocation;
2433 loc = srelgot->contents;
2434 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
2435 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2436 }
2437
2438 local_got_offsets[r_symndx] |= 1;
2439 }
2440 }
2441
2442 if (off >= (bfd_vma) -2)
2443 abort ();
2444
2445 relocation = htab->sgot->output_offset + off;
2446
2447 /* For @GOTENT the relocation is against the offset between
2448 the instruction and the symbols entry in the GOT and not
2449 between the start of the GOT and the symbols entry. We
2450 add the vma of the GOT to get the correct value. */
2451 if ( r_type == R_390_GOTENT
2452 || r_type == R_390_GOTPLTENT)
2453 relocation += htab->sgot->output_section->vma;
2454
2455 break;
2456
2457 case R_390_GOTOFF16:
2458 case R_390_GOTOFF32:
2459 /* Relocation is relative to the start of the global offset
2460 table. */
2461
2462 /* Note that sgot->output_offset is not involved in this
2463 calculation. We always want the start of .got. If we
2464 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2465 permitted by the ABI, we might have to change this
2466 calculation. */
2467 relocation -= htab->sgot->output_section->vma;
2468 break;
2469
2470 case R_390_GOTPC:
2471 case R_390_GOTPCDBL:
2472 /* Use global offset table as symbol value. */
2473 relocation = htab->sgot->output_section->vma;
2474 unresolved_reloc = FALSE;
2475 break;
2476
2477 case R_390_PLT16DBL:
2478 case R_390_PLT32DBL:
2479 case R_390_PLT32:
2480 /* Relocation is to the entry for this symbol in the
2481 procedure linkage table. */
2482
2483 /* Resolve a PLT32 reloc against a local symbol directly,
2484 without using the procedure linkage table. */
2485 if (h == NULL)
2486 break;
2487
2488 if (h->plt.offset == (bfd_vma) -1
2489 || htab->splt == NULL)
2490 {
2491 /* We didn't make a PLT entry for this symbol. This
2492 happens when statically linking PIC code, or when
2493 using -Bsymbolic. */
2494 break;
2495 }
2496
2497 relocation = (htab->splt->output_section->vma
2498 + htab->splt->output_offset
2499 + h->plt.offset);
2500 unresolved_reloc = FALSE;
2501 break;
2502
2503 case R_390_PLTOFF16:
2504 case R_390_PLTOFF32:
2505 /* Relocation is to the entry for this symbol in the
2506 procedure linkage table relative to the start of the GOT. */
2507
2508 /* For local symbols or if we didn't make a PLT entry for
2509 this symbol resolve the symbol directly. */
2510 if ( h == NULL
2511 || h->plt.offset == (bfd_vma) -1
2512 || htab->splt == NULL)
2513 {
2514 relocation -= htab->sgot->output_section->vma;
2515 break;
2516 }
2517
2518 relocation = (htab->splt->output_section->vma
2519 + htab->splt->output_offset
2520 + h->plt.offset
2521 - htab->sgot->output_section->vma);
2522 unresolved_reloc = FALSE;
2523 break;
2524
2525 case R_390_8:
2526 case R_390_16:
2527 case R_390_32:
2528 case R_390_PC16:
2529 case R_390_PC16DBL:
2530 case R_390_PC32DBL:
2531 case R_390_PC32:
2532 /* r_symndx will be zero only for relocs against symbols
2533 from removed linkonce sections, or sections discarded by
2534 a linker script. */
2535 if (r_symndx == 0
2536 || (input_section->flags & SEC_ALLOC) == 0)
2537 break;
2538
2539 if ((info->shared
2540 && (h == NULL
2541 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2542 || h->root.type != bfd_link_hash_undefweak)
2543 && ((r_type != R_390_PC16
2544 && r_type != R_390_PC16DBL
2545 && r_type != R_390_PC32DBL
2546 && r_type != R_390_PC32)
2547 || (h != NULL
2548 && !SYMBOL_REFERENCES_LOCAL (info, h))))
2549 || (ELIMINATE_COPY_RELOCS
2550 && !info->shared
2551 && h != NULL
2552 && h->dynindx != -1
2553 && !h->non_got_ref
2554 && ((h->def_dynamic
2555 && !h->def_regular)
2556 || h->root.type == bfd_link_hash_undefweak
2557 || h->root.type == bfd_link_hash_undefined)))
2558 {
2559 Elf_Internal_Rela outrel;
2560 bfd_boolean skip, relocate;
2561 asection *sreloc;
2562 bfd_byte *loc;
2563
2564 /* When generating a shared object, these relocations
2565 are copied into the output file to be resolved at run
2566 time. */
2567
2568 skip = FALSE;
2569 relocate = FALSE;
2570
2571 outrel.r_offset =
2572 _bfd_elf_section_offset (output_bfd, info, input_section,
2573 rel->r_offset);
2574 if (outrel.r_offset == (bfd_vma) -1)
2575 skip = TRUE;
2576 else if (outrel.r_offset == (bfd_vma) -2)
2577 skip = TRUE, relocate = TRUE;
2578 outrel.r_offset += (input_section->output_section->vma
2579 + input_section->output_offset);
2580
2581 if (skip)
2582 memset (&outrel, 0, sizeof outrel);
2583 else if (h != NULL
2584 && h->dynindx != -1
2585 && (r_type == R_390_PC16
2586 || r_type == R_390_PC16DBL
2587 || r_type == R_390_PC32DBL
2588 || r_type == R_390_PC32
2589 || !info->shared
2590 || !info->symbolic
2591 || !h->def_regular))
2592 {
2593 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2594 outrel.r_addend = rel->r_addend;
2595 }
2596 else
2597 {
2598 /* This symbol is local, or marked to become local. */
2599 outrel.r_addend = relocation + rel->r_addend;
2600 if (r_type == R_390_32)
2601 {
2602 relocate = TRUE;
2603 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2604 }
2605 else
2606 {
2607 long sindx;
2608
2609 if (bfd_is_abs_section (sec))
2610 sindx = 0;
2611 else if (sec == NULL || sec->owner == NULL)
2612 {
2613 bfd_set_error(bfd_error_bad_value);
2614 return FALSE;
2615 }
2616 else
2617 {
2618 asection *osec;
2619
2620 osec = sec->output_section;
2621 sindx = elf_section_data (osec)->dynindx;
2622 BFD_ASSERT (sindx > 0);
2623
2624 /* We are turning this relocation into one
2625 against a section symbol, so subtract out
2626 the output section's address but not the
2627 offset of the input section in the output
2628 section. */
2629
2630 outrel.r_addend -= osec->vma;
2631 }
2632 outrel.r_info = ELF32_R_INFO (sindx, r_type);
2633 }
2634 }
2635
2636 sreloc = elf_section_data (input_section)->sreloc;
2637 if (sreloc == NULL)
2638 abort ();
2639
2640 loc = sreloc->contents;
2641 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2642 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2643
2644 /* If this reloc is against an external symbol, we do
2645 not want to fiddle with the addend. Otherwise, we
2646 need to include the symbol value so that it becomes
2647 an addend for the dynamic reloc. */
2648 if (! relocate)
2649 continue;
2650 }
2651 break;
2652
2653 /* Relocations for tls literal pool entries. */
2654 case R_390_TLS_IE32:
2655 if (info->shared)
2656 {
2657 Elf_Internal_Rela outrel;
2658 asection *sreloc;
2659 bfd_byte *loc;
2660
2661 outrel.r_offset = rel->r_offset
2662 + input_section->output_section->vma
2663 + input_section->output_offset;
2664 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2665 sreloc = elf_section_data (input_section)->sreloc;
2666 if (sreloc == NULL)
2667 abort ();
2668 loc = sreloc->contents;
2669 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2670 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2671 }
2672 /* Fall through. */
2673
2674 case R_390_TLS_GD32:
2675 case R_390_TLS_GOTIE32:
2676 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2677 tls_type = GOT_UNKNOWN;
2678 if (h == NULL && local_got_offsets)
2679 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2680 else if (h != NULL)
2681 {
2682 tls_type = elf_s390_hash_entry(h)->tls_type;
2683 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2684 r_type = R_390_TLS_LE32;
2685 }
2686 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE)
2687 r_type = R_390_TLS_IE32;
2688
2689 if (r_type == R_390_TLS_LE32)
2690 {
2691 /* This relocation gets optimized away by the local exec
2692 access optimization. */
2693 BFD_ASSERT (! unresolved_reloc);
2694 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2695 contents + rel->r_offset);
2696 continue;
2697 }
2698
2699 if (htab->sgot == NULL)
2700 abort ();
2701
2702 if (h != NULL)
2703 off = h->got.offset;
2704 else
2705 {
2706 if (local_got_offsets == NULL)
2707 abort ();
2708
2709 off = local_got_offsets[r_symndx];
2710 }
2711
2712 emit_tls_relocs:
2713
2714 if ((off & 1) != 0)
2715 off &= ~1;
2716 else
2717 {
2718 Elf_Internal_Rela outrel;
2719 bfd_byte *loc;
2720 int dr_type, indx;
2721
2722 if (htab->srelgot == NULL)
2723 abort ();
2724
2725 outrel.r_offset = (htab->sgot->output_section->vma
2726 + htab->sgot->output_offset + off);
2727
2728 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2729 if (r_type == R_390_TLS_GD32)
2730 dr_type = R_390_TLS_DTPMOD;
2731 else
2732 dr_type = R_390_TLS_TPOFF;
2733 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2734 outrel.r_addend = relocation - dtpoff_base (info);
2735 else
2736 outrel.r_addend = 0;
2737 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2738 loc = htab->srelgot->contents;
2739 loc += htab->srelgot->reloc_count++
2740 * sizeof (Elf32_External_Rela);
2741 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2742
2743 if (r_type == R_390_TLS_GD32)
2744 {
2745 if (indx == 0)
2746 {
2747 BFD_ASSERT (! unresolved_reloc);
2748 bfd_put_32 (output_bfd,
2749 relocation - dtpoff_base (info),
2750 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2751 }
2752 else
2753 {
2754 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF);
2755 outrel.r_offset += GOT_ENTRY_SIZE;
2756 outrel.r_addend = 0;
2757 htab->srelgot->reloc_count++;
2758 loc += sizeof (Elf32_External_Rela);
2759 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2760 }
2761 }
2762
2763 if (h != NULL)
2764 h->got.offset |= 1;
2765 else
2766 local_got_offsets[r_symndx] |= 1;
2767 }
2768
2769 if (off >= (bfd_vma) -2)
2770 abort ();
2771 if (r_type == ELF32_R_TYPE (rel->r_info))
2772 {
2773 relocation = htab->sgot->output_offset + off;
2774 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT)
2775 relocation += htab->sgot->output_section->vma;
2776 unresolved_reloc = FALSE;
2777 }
2778 else
2779 {
2780 bfd_put_32 (output_bfd, htab->sgot->output_offset + off,
2781 contents + rel->r_offset);
2782 continue;
2783 }
2784 break;
2785
2786 case R_390_TLS_GOTIE12:
2787 case R_390_TLS_GOTIE20:
2788 case R_390_TLS_IEENT:
2789 if (h == NULL)
2790 {
2791 if (local_got_offsets == NULL)
2792 abort();
2793 off = local_got_offsets[r_symndx];
2794 if (info->shared)
2795 goto emit_tls_relocs;
2796 }
2797 else
2798 {
2799 off = h->got.offset;
2800 tls_type = elf_s390_hash_entry(h)->tls_type;
2801 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2802 goto emit_tls_relocs;
2803 }
2804
2805 if (htab->sgot == NULL)
2806 abort ();
2807
2808 BFD_ASSERT (! unresolved_reloc);
2809 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2810 htab->sgot->contents + off);
2811 relocation = htab->sgot->output_offset + off;
2812 if (r_type == R_390_TLS_IEENT)
2813 relocation += htab->sgot->output_section->vma;
2814 unresolved_reloc = FALSE;
2815 break;
2816
2817 case R_390_TLS_LDM32:
2818 if (! info->shared)
2819 /* The literal pool entry this relocation refers to gets ignored
2820 by the optimized code of the local exec model. Do nothing
2821 and the value will turn out zero. */
2822 continue;
2823
2824 if (htab->sgot == NULL)
2825 abort ();
2826
2827 off = htab->tls_ldm_got.offset;
2828 if (off & 1)
2829 off &= ~1;
2830 else
2831 {
2832 Elf_Internal_Rela outrel;
2833 bfd_byte *loc;
2834
2835 if (htab->srelgot == NULL)
2836 abort ();
2837
2838 outrel.r_offset = (htab->sgot->output_section->vma
2839 + htab->sgot->output_offset + off);
2840
2841 bfd_put_32 (output_bfd, 0,
2842 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2843 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD);
2844 outrel.r_addend = 0;
2845 loc = htab->srelgot->contents;
2846 loc += htab->srelgot->reloc_count++
2847 * sizeof (Elf32_External_Rela);
2848 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2849 htab->tls_ldm_got.offset |= 1;
2850 }
2851 relocation = htab->sgot->output_offset + off;
2852 unresolved_reloc = FALSE;
2853 break;
2854
2855 case R_390_TLS_LE32:
2856 if (info->shared)
2857 {
2858 /* Linking a shared library with non-fpic code requires
2859 a R_390_TLS_TPOFF relocation. */
2860 Elf_Internal_Rela outrel;
2861 asection *sreloc;
2862 bfd_byte *loc;
2863 int indx;
2864
2865 outrel.r_offset = rel->r_offset
2866 + input_section->output_section->vma
2867 + input_section->output_offset;
2868 if (h != NULL && h->dynindx != -1)
2869 indx = h->dynindx;
2870 else
2871 indx = 0;
2872 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF);
2873 if (indx == 0)
2874 outrel.r_addend = relocation - dtpoff_base (info);
2875 else
2876 outrel.r_addend = 0;
2877 sreloc = elf_section_data (input_section)->sreloc;
2878 if (sreloc == NULL)
2879 abort ();
2880 loc = sreloc->contents;
2881 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2882 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2883 }
2884 else
2885 {
2886 BFD_ASSERT (! unresolved_reloc);
2887 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2888 contents + rel->r_offset);
2889 }
2890 continue;
2891
2892 case R_390_TLS_LDO32:
2893 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2894 relocation -= dtpoff_base (info);
2895 else
2896 /* When converting LDO to LE, we must negate. */
2897 relocation = -tpoff (info, relocation);
2898 break;
2899
2900 /* Relocations for tls instructions. */
2901 case R_390_TLS_LOAD:
2902 case R_390_TLS_GDCALL:
2903 case R_390_TLS_LDCALL:
2904 tls_type = GOT_UNKNOWN;
2905 if (h == NULL && local_got_offsets)
2906 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2907 else if (h != NULL)
2908 tls_type = elf_s390_hash_entry(h)->tls_type;
2909
2910 if (tls_type == GOT_TLS_GD)
2911 continue;
2912
2913 if (r_type == R_390_TLS_LOAD)
2914 {
2915 if (!info->shared && (h == NULL || h->dynindx == -1))
2916 {
2917 /* IE->LE transition. Four valid cases:
2918 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0
2919 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0
2920 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0
2921 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2922 unsigned int insn, ry;
2923
2924 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2925 ry = 0;
2926 if ((insn & 0xff00f000) == 0x58000000)
2927 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */
2928 ry = (insn & 0x000f0000);
2929 else if ((insn & 0xff0f0000) == 0x58000000)
2930 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */
2931 ry = (insn & 0x0000f000) << 4;
2932 else if ((insn & 0xff00f000) == 0x5800c000)
2933 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */
2934 ry = (insn & 0x000f0000);
2935 else if ((insn & 0xff0f0000) == 0x580c0000)
2936 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2937 ry = (insn & 0x0000f000) << 4;
2938 else
2939 invalid_tls_insn (input_bfd, input_section, rel);
2940 insn = 0x18000700 | (insn & 0x00f00000) | ry;
2941 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2942 }
2943 }
2944 else if (r_type == R_390_TLS_GDCALL)
2945 {
2946 unsigned int insn;
2947
2948 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2949 if ((insn & 0xff000fff) != 0x4d000000)
2950 invalid_tls_insn (input_bfd, input_section, rel);
2951 if (!info->shared && (h == NULL || h->dynindx == -1))
2952 /* GD->LE transition.
2953 bas %r14,0(%rx,%r13) -> bc 0,0 */
2954 insn = 0x47000000;
2955 else
2956 /* GD->IE transition.
2957 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */
2958 insn = 0x5822c000;
2959 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2960 }
2961 else if (r_type == R_390_TLS_LDCALL)
2962 {
2963 if (!info->shared)
2964 {
2965 unsigned int insn;
2966
2967 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2968 if ((insn & 0xff000fff) != 0x4d000000)
2969 invalid_tls_insn (input_bfd, input_section, rel);
2970 /* LD->LE transition.
2971 bas %r14,0(%rx,%r13) -> bc 0,0 */
2972 insn = 0x47000000;
2973 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2974 }
2975 }
2976 continue;
2977
2978 default:
2979 break;
2980 }
2981
2982 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2983 because such sections are not SEC_ALLOC and thus ld.so will
2984 not process them. */
2985 if (unresolved_reloc
2986 && !((input_section->flags & SEC_DEBUGGING) != 0
2987 && h->def_dynamic))
2988 (*_bfd_error_handler)
2989 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
2990 input_bfd,
2991 input_section,
2992 (long) rel->r_offset,
2993 h->root.root.string);
2994
2995 if (r_type == R_390_20
2996 || r_type == R_390_GOT20
2997 || r_type == R_390_GOTPLT20
2998 || r_type == R_390_TLS_GOTIE20)
2999 {
3000 relocation += rel->r_addend;
3001 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3002 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3003 contents, rel->r_offset,
3004 relocation, 0);
3005 }
3006 else
3007 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3008 contents, rel->r_offset,
3009 relocation, rel->r_addend);
3010
3011 if (r != bfd_reloc_ok)
3012 {
3013 const char *name;
3014
3015 if (h != NULL)
3016 name = h->root.root.string;
3017 else
3018 {
3019 name = bfd_elf_string_from_elf_section (input_bfd,
3020 symtab_hdr->sh_link,
3021 sym->st_name);
3022 if (name == NULL)
3023 return FALSE;
3024 if (*name == '\0')
3025 name = bfd_section_name (input_bfd, sec);
3026 }
3027
3028 if (r == bfd_reloc_overflow)
3029 {
3030
3031 if (! ((*info->callbacks->reloc_overflow)
3032 (info, (h ? &h->root : NULL), name, howto->name,
3033 (bfd_vma) 0, input_bfd, input_section,
3034 rel->r_offset)))
3035 return FALSE;
3036 }
3037 else
3038 {
3039 (*_bfd_error_handler)
3040 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3041 input_bfd, input_section,
3042 (long) rel->r_offset, name, (int) r);
3043 return FALSE;
3044 }
3045 }
3046 }
3047
3048 return TRUE;
3049 }
3050
3051 /* Finish up dynamic symbol handling. We set the contents of various
3052 dynamic sections here. */
3053
3054 static bfd_boolean
3055 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3056 bfd *output_bfd;
3057 struct bfd_link_info *info;
3058 struct elf_link_hash_entry *h;
3059 Elf_Internal_Sym *sym;
3060 {
3061 struct elf_s390_link_hash_table *htab;
3062
3063 htab = elf_s390_hash_table (info);
3064
3065 if (h->plt.offset != (bfd_vma) -1)
3066 {
3067 bfd_vma plt_index;
3068 bfd_vma got_offset;
3069 Elf_Internal_Rela rela;
3070 bfd_byte *loc;
3071 bfd_vma relative_offset;
3072
3073 /* This symbol has an entry in the procedure linkage table. Set
3074 it up. */
3075 if (h->dynindx == -1
3076 || htab->splt == NULL
3077 || htab->sgotplt == NULL
3078 || htab->srelplt == NULL)
3079 abort ();
3080
3081 /* Calc. index no.
3082 Current offset - size first entry / entry size. */
3083 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3084
3085 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
3086 addr & GOT addr. */
3087 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3088
3089 /* S390 uses halfwords for relative branch calc! */
3090 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
3091 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
3092 /* If offset is > 32768, branch to a previous branch
3093 390 can only handle +-64 K jumps. */
3094 if ( -32768 > (int) relative_offset )
3095 relative_offset
3096 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3097
3098 /* Fill in the entry in the procedure linkage table. */
3099 if (!info->shared)
3100 {
3101 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3102 htab->splt->contents + h->plt.offset);
3103 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3104 htab->splt->contents + h->plt.offset + 4);
3105 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3106 htab->splt->contents + h->plt.offset + 8);
3107 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3108 htab->splt->contents + h->plt.offset + 12);
3109 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3110 htab->splt->contents + h->plt.offset + 16);
3111 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3112 htab->splt->contents + h->plt.offset + 20);
3113 bfd_put_32 (output_bfd,
3114 (htab->sgotplt->output_section->vma
3115 + htab->sgotplt->output_offset
3116 + got_offset),
3117 htab->splt->contents + h->plt.offset + 24);
3118 }
3119 else if (got_offset < 4096)
3120 {
3121 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD0 + got_offset,
3122 htab->splt->contents + h->plt.offset);
3123 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD1,
3124 htab->splt->contents + h->plt.offset + 4);
3125 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD2,
3126 htab->splt->contents + h->plt.offset + 8);
3127 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD3,
3128 htab->splt->contents + h->plt.offset + 12);
3129 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD4,
3130 htab->splt->contents + h->plt.offset + 16);
3131 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3132 htab->splt->contents + h->plt.offset + 20);
3133 bfd_put_32 (output_bfd, (bfd_vma) 0,
3134 htab->splt->contents + h->plt.offset + 24);
3135 }
3136 else if (got_offset < 32768)
3137 {
3138 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD0 + got_offset,
3139 htab->splt->contents + h->plt.offset);
3140 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD1,
3141 htab->splt->contents + h->plt.offset + 4);
3142 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD2,
3143 htab->splt->contents + h->plt.offset + 8);
3144 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD3,
3145 htab->splt->contents + h->plt.offset + 12);
3146 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD4,
3147 htab->splt->contents + h->plt.offset + 16);
3148 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3149 htab->splt->contents + h->plt.offset + 20);
3150 bfd_put_32 (output_bfd, (bfd_vma) 0,
3151 htab->splt->contents + h->plt.offset + 24);
3152 }
3153 else
3154 {
3155 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD0,
3156 htab->splt->contents + h->plt.offset);
3157 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD1,
3158 htab->splt->contents + h->plt.offset + 4);
3159 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD2,
3160 htab->splt->contents + h->plt.offset + 8);
3161 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD3,
3162 htab->splt->contents + h->plt.offset + 12);
3163 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD4,
3164 htab->splt->contents + h->plt.offset + 16);
3165 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3166 htab->splt->contents + h->plt.offset + 20);
3167 bfd_put_32 (output_bfd, got_offset,
3168 htab->splt->contents + h->plt.offset + 24);
3169 }
3170 /* Insert offset into reloc. table here. */
3171 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
3172 htab->splt->contents + h->plt.offset + 28);
3173
3174 /* Fill in the entry in the global offset table.
3175 Points to instruction after GOT offset. */
3176 bfd_put_32 (output_bfd,
3177 (htab->splt->output_section->vma
3178 + htab->splt->output_offset
3179 + h->plt.offset
3180 + 12),
3181 htab->sgotplt->contents + got_offset);
3182
3183 /* Fill in the entry in the .rela.plt section. */
3184 rela.r_offset = (htab->sgotplt->output_section->vma
3185 + htab->sgotplt->output_offset
3186 + got_offset);
3187 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3188 rela.r_addend = 0;
3189 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rela);
3190 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3191
3192 if (!h->def_regular)
3193 {
3194 /* Mark the symbol as undefined, rather than as defined in
3195 the .plt section. Leave the value alone. This is a clue
3196 for the dynamic linker, to make function pointer
3197 comparisons work between an application and shared
3198 library. */
3199 sym->st_shndx = SHN_UNDEF;
3200 }
3201 }
3202
3203 if (h->got.offset != (bfd_vma) -1
3204 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3205 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3206 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3207 {
3208 Elf_Internal_Rela rela;
3209 bfd_byte *loc;
3210
3211 /* This symbol has an entry in the global offset table. Set it
3212 up. */
3213
3214 if (htab->sgot == NULL || htab->srelgot == NULL)
3215 abort ();
3216
3217 rela.r_offset = (htab->sgot->output_section->vma
3218 + htab->sgot->output_offset
3219 + (h->got.offset &~ (bfd_vma) 1));
3220
3221 /* If this is a static link, or it is a -Bsymbolic link and the
3222 symbol is defined locally or was forced to be local because
3223 of a version file, we just want to emit a RELATIVE reloc.
3224 The entry in the global offset table will already have been
3225 initialized in the relocate_section function. */
3226 if (info->shared
3227 && (info->symbolic
3228 || h->dynindx == -1
3229 || h->forced_local)
3230 && h->def_regular)
3231 {
3232 BFD_ASSERT((h->got.offset & 1) != 0);
3233 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
3234 rela.r_addend = (h->root.u.def.value
3235 + h->root.u.def.section->output_section->vma
3236 + h->root.u.def.section->output_offset);
3237 }
3238 else
3239 {
3240 BFD_ASSERT((h->got.offset & 1) == 0);
3241 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3242 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
3243 rela.r_addend = 0;
3244 }
3245
3246 loc = htab->srelgot->contents;
3247 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3248 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3249 }
3250
3251 if (h->needs_copy)
3252 {
3253 Elf_Internal_Rela rela;
3254 bfd_byte *loc;
3255
3256 /* This symbols needs a copy reloc. Set it up. */
3257
3258 if (h->dynindx == -1
3259 || (h->root.type != bfd_link_hash_defined
3260 && h->root.type != bfd_link_hash_defweak)
3261 || htab->srelbss == NULL)
3262 abort ();
3263
3264 rela.r_offset = (h->root.u.def.value
3265 + h->root.u.def.section->output_section->vma
3266 + h->root.u.def.section->output_offset);
3267 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
3268 rela.r_addend = 0;
3269 loc = htab->srelbss->contents;
3270 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rela);
3271 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3272 }
3273
3274 /* Mark some specially defined symbols as absolute. */
3275 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3276 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
3277 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
3278 sym->st_shndx = SHN_ABS;
3279
3280 return TRUE;
3281 }
3282
3283 /* Used to decide how to sort relocs in an optimal manner for the
3284 dynamic linker, before writing them out. */
3285
3286 static enum elf_reloc_type_class
3287 elf_s390_reloc_type_class (rela)
3288 const Elf_Internal_Rela *rela;
3289 {
3290 switch ((int) ELF32_R_TYPE (rela->r_info))
3291 {
3292 case R_390_RELATIVE:
3293 return reloc_class_relative;
3294 case R_390_JMP_SLOT:
3295 return reloc_class_plt;
3296 case R_390_COPY:
3297 return reloc_class_copy;
3298 default:
3299 return reloc_class_normal;
3300 }
3301 }
3302
3303 /* Finish up the dynamic sections. */
3304
3305 static bfd_boolean
3306 elf_s390_finish_dynamic_sections (output_bfd, info)
3307 bfd *output_bfd;
3308 struct bfd_link_info *info;
3309 {
3310 struct elf_s390_link_hash_table *htab;
3311 bfd *dynobj;
3312 asection *sdyn;
3313
3314 htab = elf_s390_hash_table (info);
3315 dynobj = htab->elf.dynobj;
3316 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3317
3318 if (htab->elf.dynamic_sections_created)
3319 {
3320 Elf32_External_Dyn *dyncon, *dynconend;
3321
3322 if (sdyn == NULL || htab->sgot == NULL)
3323 abort ();
3324
3325 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3326 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3327 for (; dyncon < dynconend; dyncon++)
3328 {
3329 Elf_Internal_Dyn dyn;
3330 asection *s;
3331
3332 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3333
3334 switch (dyn.d_tag)
3335 {
3336 default:
3337 continue;
3338
3339 case DT_PLTGOT:
3340 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3341 break;
3342
3343 case DT_JMPREL:
3344 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3345 break;
3346
3347 case DT_PLTRELSZ:
3348 s = htab->srelplt->output_section;
3349 dyn.d_un.d_val = s->size;
3350 break;
3351 }
3352
3353 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3354 }
3355
3356 /* Fill in the special first entry in the procedure linkage table. */
3357 if (htab->splt && htab->splt->size > 0)
3358 {
3359 memset (htab->splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
3360 if (info->shared)
3361 {
3362 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD0,
3363 htab->splt->contents );
3364 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD1,
3365 htab->splt->contents +4 );
3366 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD2,
3367 htab->splt->contents +8 );
3368 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD3,
3369 htab->splt->contents +12 );
3370 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD4,
3371 htab->splt->contents +16 );
3372 }
3373 else
3374 {
3375 bfd_put_32 (output_bfd, (bfd_vma)PLT_FIRST_ENTRY_WORD0,
3376 htab->splt->contents );
3377 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3378 htab->splt->contents +4 );
3379 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD2,
3380 htab->splt->contents +8 );
3381 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3382 htab->splt->contents +12 );
3383 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3384 htab->splt->contents +16 );
3385 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3386 htab->splt->contents +20 );
3387 bfd_put_32 (output_bfd,
3388 htab->sgotplt->output_section->vma
3389 + htab->sgotplt->output_offset,
3390 htab->splt->contents + 24);
3391 }
3392 elf_section_data (htab->splt->output_section)
3393 ->this_hdr.sh_entsize = 4;
3394 }
3395
3396 }
3397
3398 if (htab->sgotplt)
3399 {
3400 /* Fill in the first three entries in the global offset table. */
3401 if (htab->sgotplt->size > 0)
3402 {
3403 bfd_put_32 (output_bfd,
3404 (sdyn == NULL ? (bfd_vma) 0
3405 : sdyn->output_section->vma + sdyn->output_offset),
3406 htab->sgotplt->contents);
3407 /* One entry for shared object struct ptr. */
3408 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4);
3409 /* One entry for _dl_runtime_resolve. */
3410 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3411 }
3412
3413 elf_section_data (htab->sgotplt->output_section)
3414 ->this_hdr.sh_entsize = 4;
3415 }
3416 return TRUE;
3417 }
3418
3419 static bfd_boolean
3420 elf_s390_grok_prstatus (abfd, note)
3421 bfd * abfd;
3422 Elf_Internal_Note * note;
3423 {
3424 int offset;
3425 unsigned int size;
3426
3427 switch (note->descsz)
3428 {
3429 default:
3430 return FALSE;
3431
3432 case 224: /* S/390 Linux. */
3433 /* pr_cursig */
3434 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3435
3436 /* pr_pid */
3437 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
3438
3439 /* pr_reg */
3440 offset = 72;
3441 size = 144;
3442 break;
3443 }
3444
3445 /* Make a ".reg/999" section. */
3446 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3447 size, note->descpos + offset);
3448 }
3449
3450 /* Return address for Ith PLT stub in section PLT, for relocation REL
3451 or (bfd_vma) -1 if it should not be included. */
3452
3453 static bfd_vma
3454 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3455 const arelent *rel ATTRIBUTE_UNUSED)
3456 {
3457 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3458 }
3459
3460
3461 #define TARGET_BIG_SYM bfd_elf32_s390_vec
3462 #define TARGET_BIG_NAME "elf32-s390"
3463 #define ELF_ARCH bfd_arch_s390
3464 #define ELF_MACHINE_CODE EM_S390
3465 #define ELF_MACHINE_ALT1 EM_S390_OLD
3466 #define ELF_MAXPAGESIZE 0x1000
3467
3468 #define elf_backend_can_gc_sections 1
3469 #define elf_backend_can_refcount 1
3470 #define elf_backend_want_got_plt 1
3471 #define elf_backend_plt_readonly 1
3472 #define elf_backend_want_plt_sym 0
3473 #define elf_backend_got_header_size 12
3474 #define elf_backend_rela_normal 1
3475
3476 #define elf_info_to_howto elf_s390_info_to_howto
3477
3478 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
3479 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
3480 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3481
3482 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3483 #define elf_backend_check_relocs elf_s390_check_relocs
3484 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3485 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3486 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3487 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3488 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3489 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3490 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3491 #define elf_backend_relocate_section elf_s390_relocate_section
3492 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3493 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3494 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
3495 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3496
3497 #define bfd_elf32_mkobject elf_s390_mkobject
3498 #define elf_backend_object_p elf_s390_object_p
3499
3500 #include "elf32-target.h"
GDB Binutils - Deliverables
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