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2009-06-10 Philip Blundell <philb@gnu.org>
[binutils.git] / bfd / elf32-s390.c
blob14c4cb0c998278ae16af273c0da4343318250dea
1 /* IBM S/390-specific support for 32-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
3 Free Software Foundation, Inc.
4 Contributed by Carl B. Pedersen and Martin Schwidefsky.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28
29 static reloc_howto_type *elf_s390_reloc_type_lookup
30 PARAMS ((bfd *, bfd_reloc_code_real_type));
31 static void elf_s390_info_to_howto
32 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
33 static bfd_boolean elf_s390_is_local_label_name
34 PARAMS ((bfd *, const char *));
35 static struct bfd_hash_entry *link_hash_newfunc
36 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
37 static struct bfd_link_hash_table *elf_s390_link_hash_table_create
38 PARAMS ((bfd *));
39 static bfd_boolean create_got_section
40 PARAMS((bfd *, struct bfd_link_info *));
41 static bfd_boolean elf_s390_create_dynamic_sections
42 PARAMS((bfd *, struct bfd_link_info *));
43 static void elf_s390_copy_indirect_symbol
44 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *,
45 struct elf_link_hash_entry *));
46 static bfd_boolean elf_s390_check_relocs
47 PARAMS ((bfd *, struct bfd_link_info *, asection *,
48 const Elf_Internal_Rela *));
49 struct elf_s390_link_hash_entry;
50 static void elf_s390_adjust_gotplt
51 PARAMS ((struct elf_s390_link_hash_entry *));
52 static bfd_boolean elf_s390_adjust_dynamic_symbol
53 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
54 static bfd_boolean allocate_dynrelocs
55 PARAMS ((struct elf_link_hash_entry *, PTR));
56 static bfd_boolean readonly_dynrelocs
57 PARAMS ((struct elf_link_hash_entry *, PTR));
58 static bfd_boolean elf_s390_size_dynamic_sections
59 PARAMS ((bfd *, struct bfd_link_info *));
60 static bfd_boolean elf_s390_relocate_section
61 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
62 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
63 static bfd_boolean elf_s390_finish_dynamic_symbol
64 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
65 Elf_Internal_Sym *));
66 static enum elf_reloc_type_class elf_s390_reloc_type_class
67 PARAMS ((const Elf_Internal_Rela *));
68 static bfd_boolean elf_s390_finish_dynamic_sections
69 PARAMS ((bfd *, struct bfd_link_info *));
70 static bfd_boolean elf_s390_object_p
71 PARAMS ((bfd *));
72 static bfd_boolean elf_s390_grok_prstatus
73 PARAMS ((bfd *, Elf_Internal_Note *));
74 static int elf_s390_tls_transition
75 PARAMS ((struct bfd_link_info *, int, int));
76 static bfd_reloc_status_type s390_tls_reloc
77 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
78 static bfd_vma dtpoff_base
79 PARAMS ((struct bfd_link_info *));
80 static bfd_vma tpoff
81 PARAMS ((struct bfd_link_info *, bfd_vma));
82 static void invalid_tls_insn
83 PARAMS ((bfd *, asection *, Elf_Internal_Rela *));
84 static bfd_reloc_status_type s390_elf_ldisp_reloc
85 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
86
87 #include "elf/s390.h"
88
89 /* The relocation "howto" table. */
90
91 static reloc_howto_type elf_howto_table[] =
92 {
93 HOWTO (R_390_NONE, /* type */
94 0, /* rightshift */
95 0, /* size (0 = byte, 1 = short, 2 = long) */
96 0, /* bitsize */
97 FALSE, /* pc_relative */
98 0, /* bitpos */
99 complain_overflow_dont, /* complain_on_overflow */
100 bfd_elf_generic_reloc, /* special_function */
101 "R_390_NONE", /* name */
102 FALSE, /* partial_inplace */
103 0, /* src_mask */
104 0, /* dst_mask */
105 FALSE), /* pcrel_offset */
106
107 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
109 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
110 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
111 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
112 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
113 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
115 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
116 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
117 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
119 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
121 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
123 HOWTO(R_390_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,0xffffffff, FALSE),
125 HOWTO(R_390_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,0xffffffff, FALSE),
127 HOWTO(R_390_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,0xffffffff, FALSE),
129 HOWTO(R_390_RELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,0xffffffff, FALSE),
131 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,0xffffffff, FALSE),
133 HOWTO(R_390_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
134 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,0xffffffff, TRUE),
135 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
136 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
137 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
139 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
140 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
141 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
142 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
143 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
145 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
146 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
147 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
148 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,0xffffffff, TRUE),
149 EMPTY_HOWTO (R_390_64), /* Empty entry for R_390_64. */
150 EMPTY_HOWTO (R_390_PC64), /* Empty entry for R_390_PC64. */
151 EMPTY_HOWTO (R_390_GOT64), /* Empty entry for R_390_GOT64. */
152 EMPTY_HOWTO (R_390_PLT64), /* Empty entry for R_390_PLT64. */
153 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
154 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,0xffffffff, TRUE),
155 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
156 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
157 EMPTY_HOWTO (R_390_GOTOFF64), /* Empty entry for R_390_GOTOFF64. */
158 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
159 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
160 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
161 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
162 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
163 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
164 EMPTY_HOWTO (R_390_GOTPLT64), /* Empty entry for R_390_GOTPLT64. */
165 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
166 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,0xffffffff, TRUE),
167 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
168 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
169 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
170 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
171 EMPTY_HOWTO (R_390_PLTOFF64), /* Empty entry for R_390_PLTOFF64. */
172 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont,
173 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE),
174 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
175 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE),
176 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
177 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE),
178 HOWTO(R_390_TLS_GD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
179 bfd_elf_generic_reloc, "R_390_TLS_GD32", FALSE, 0, 0xffffffff, FALSE),
180 EMPTY_HOWTO (R_390_TLS_GD64), /* Empty entry for R_390_TLS_GD64. */
181 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
182 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE),
183 HOWTO(R_390_TLS_GOTIE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
184 bfd_elf_generic_reloc, "R_390_TLS_GOTIE32", FALSE, 0, 0xffffffff, FALSE),
185 EMPTY_HOWTO (R_390_TLS_GOTIE64), /* Empty entry for R_390_TLS_GOTIE64. */
186 HOWTO(R_390_TLS_LDM32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
187 bfd_elf_generic_reloc, "R_390_TLS_LDM32", FALSE, 0, 0xffffffff, FALSE),
188 EMPTY_HOWTO (R_390_TLS_LDM64), /* Empty entry for R_390_TLS_LDM64. */
189 HOWTO(R_390_TLS_IE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
190 bfd_elf_generic_reloc, "R_390_TLS_IE32", FALSE, 0, 0xffffffff, FALSE),
191 EMPTY_HOWTO (R_390_TLS_IE64), /* Empty entry for R_390_TLS_IE64. */
192 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
193 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, 0xffffffff, TRUE),
194 HOWTO(R_390_TLS_LE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
195 bfd_elf_generic_reloc, "R_390_TLS_LE32", FALSE, 0, 0xffffffff, FALSE),
196 EMPTY_HOWTO (R_390_TLS_LE64), /* Empty entry for R_390_TLS_LE64. */
197 HOWTO(R_390_TLS_LDO32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
198 bfd_elf_generic_reloc, "R_390_TLS_LDO32", FALSE, 0, 0xffffffff, FALSE),
199 EMPTY_HOWTO (R_390_TLS_LDO64), /* Empty entry for R_390_TLS_LDO64. */
200 HOWTO(R_390_TLS_DTPMOD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
201 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, 0xffffffff, FALSE),
202 HOWTO(R_390_TLS_DTPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
203 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, 0xffffffff, FALSE),
204 HOWTO(R_390_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
205 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, 0xffffffff, FALSE),
206 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
207 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE),
208 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
209 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE),
210 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
211 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE),
212 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
213 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE),
214 };
215
216 /* GNU extension to record C++ vtable hierarchy. */
217 static reloc_howto_type elf32_s390_vtinherit_howto =
218 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
219 static reloc_howto_type elf32_s390_vtentry_howto =
220 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);
221
222 static reloc_howto_type *
223 elf_s390_reloc_type_lookup (abfd, code)
224 bfd *abfd ATTRIBUTE_UNUSED;
225 bfd_reloc_code_real_type code;
226 {
227 switch (code)
228 {
229 case BFD_RELOC_NONE:
230 return &elf_howto_table[(int) R_390_NONE];
231 case BFD_RELOC_8:
232 return &elf_howto_table[(int) R_390_8];
233 case BFD_RELOC_390_12:
234 return &elf_howto_table[(int) R_390_12];
235 case BFD_RELOC_16:
236 return &elf_howto_table[(int) R_390_16];
237 case BFD_RELOC_32:
238 return &elf_howto_table[(int) R_390_32];
239 case BFD_RELOC_CTOR:
240 return &elf_howto_table[(int) R_390_32];
241 case BFD_RELOC_32_PCREL:
242 return &elf_howto_table[(int) R_390_PC32];
243 case BFD_RELOC_390_GOT12:
244 return &elf_howto_table[(int) R_390_GOT12];
245 case BFD_RELOC_32_GOT_PCREL:
246 return &elf_howto_table[(int) R_390_GOT32];
247 case BFD_RELOC_390_PLT32:
248 return &elf_howto_table[(int) R_390_PLT32];
249 case BFD_RELOC_390_COPY:
250 return &elf_howto_table[(int) R_390_COPY];
251 case BFD_RELOC_390_GLOB_DAT:
252 return &elf_howto_table[(int) R_390_GLOB_DAT];
253 case BFD_RELOC_390_JMP_SLOT:
254 return &elf_howto_table[(int) R_390_JMP_SLOT];
255 case BFD_RELOC_390_RELATIVE:
256 return &elf_howto_table[(int) R_390_RELATIVE];
257 case BFD_RELOC_32_GOTOFF:
258 return &elf_howto_table[(int) R_390_GOTOFF32];
259 case BFD_RELOC_390_GOTPC:
260 return &elf_howto_table[(int) R_390_GOTPC];
261 case BFD_RELOC_390_GOT16:
262 return &elf_howto_table[(int) R_390_GOT16];
263 case BFD_RELOC_16_PCREL:
264 return &elf_howto_table[(int) R_390_PC16];
265 case BFD_RELOC_390_PC16DBL:
266 return &elf_howto_table[(int) R_390_PC16DBL];
267 case BFD_RELOC_390_PLT16DBL:
268 return &elf_howto_table[(int) R_390_PLT16DBL];
269 case BFD_RELOC_390_PC32DBL:
270 return &elf_howto_table[(int) R_390_PC32DBL];
271 case BFD_RELOC_390_PLT32DBL:
272 return &elf_howto_table[(int) R_390_PLT32DBL];
273 case BFD_RELOC_390_GOTPCDBL:
274 return &elf_howto_table[(int) R_390_GOTPCDBL];
275 case BFD_RELOC_390_GOTENT:
276 return &elf_howto_table[(int) R_390_GOTENT];
277 case BFD_RELOC_16_GOTOFF:
278 return &elf_howto_table[(int) R_390_GOTOFF16];
279 case BFD_RELOC_390_GOTPLT12:
280 return &elf_howto_table[(int) R_390_GOTPLT12];
281 case BFD_RELOC_390_GOTPLT16:
282 return &elf_howto_table[(int) R_390_GOTPLT16];
283 case BFD_RELOC_390_GOTPLT32:
284 return &elf_howto_table[(int) R_390_GOTPLT32];
285 case BFD_RELOC_390_GOTPLTENT:
286 return &elf_howto_table[(int) R_390_GOTPLTENT];
287 case BFD_RELOC_390_PLTOFF16:
288 return &elf_howto_table[(int) R_390_PLTOFF16];
289 case BFD_RELOC_390_PLTOFF32:
290 return &elf_howto_table[(int) R_390_PLTOFF32];
291 case BFD_RELOC_390_TLS_LOAD:
292 return &elf_howto_table[(int) R_390_TLS_LOAD];
293 case BFD_RELOC_390_TLS_GDCALL:
294 return &elf_howto_table[(int) R_390_TLS_GDCALL];
295 case BFD_RELOC_390_TLS_LDCALL:
296 return &elf_howto_table[(int) R_390_TLS_LDCALL];
297 case BFD_RELOC_390_TLS_GD32:
298 return &elf_howto_table[(int) R_390_TLS_GD32];
299 case BFD_RELOC_390_TLS_GOTIE12:
300 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
301 case BFD_RELOC_390_TLS_GOTIE32:
302 return &elf_howto_table[(int) R_390_TLS_GOTIE32];
303 case BFD_RELOC_390_TLS_LDM32:
304 return &elf_howto_table[(int) R_390_TLS_LDM32];
305 case BFD_RELOC_390_TLS_IE32:
306 return &elf_howto_table[(int) R_390_TLS_IE32];
307 case BFD_RELOC_390_TLS_IEENT:
308 return &elf_howto_table[(int) R_390_TLS_IEENT];
309 case BFD_RELOC_390_TLS_LE32:
310 return &elf_howto_table[(int) R_390_TLS_LE32];
311 case BFD_RELOC_390_TLS_LDO32:
312 return &elf_howto_table[(int) R_390_TLS_LDO32];
313 case BFD_RELOC_390_TLS_DTPMOD:
314 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
315 case BFD_RELOC_390_TLS_DTPOFF:
316 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
317 case BFD_RELOC_390_TLS_TPOFF:
318 return &elf_howto_table[(int) R_390_TLS_TPOFF];
319 case BFD_RELOC_390_20:
320 return &elf_howto_table[(int) R_390_20];
321 case BFD_RELOC_390_GOT20:
322 return &elf_howto_table[(int) R_390_GOT20];
323 case BFD_RELOC_390_GOTPLT20:
324 return &elf_howto_table[(int) R_390_GOTPLT20];
325 case BFD_RELOC_390_TLS_GOTIE20:
326 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
327 case BFD_RELOC_VTABLE_INHERIT:
328 return &elf32_s390_vtinherit_howto;
329 case BFD_RELOC_VTABLE_ENTRY:
330 return &elf32_s390_vtentry_howto;
331 default:
332 break;
333 }
334 return 0;
335 }
336
337 static reloc_howto_type *
338 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
339 const char *r_name)
340 {
341 unsigned int i;
342
343 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
344 if (elf_howto_table[i].name != NULL
345 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
346 return &elf_howto_table[i];
347
348 if (strcasecmp (elf32_s390_vtinherit_howto.name, r_name) == 0)
349 return &elf32_s390_vtinherit_howto;
350 if (strcasecmp (elf32_s390_vtentry_howto.name, r_name) == 0)
351 return &elf32_s390_vtentry_howto;
352
353 return NULL;
354 }
355
356 /* We need to use ELF32_R_TYPE so we have our own copy of this function,
357 and elf32-s390.c has its own copy. */
358
359 static void
360 elf_s390_info_to_howto (abfd, cache_ptr, dst)
361 bfd *abfd ATTRIBUTE_UNUSED;
362 arelent *cache_ptr;
363 Elf_Internal_Rela *dst;
364 {
365 unsigned int r_type = ELF32_R_TYPE(dst->r_info);
366 switch (r_type)
367 {
368 case R_390_GNU_VTINHERIT:
369 cache_ptr->howto = &elf32_s390_vtinherit_howto;
370 break;
371
372 case R_390_GNU_VTENTRY:
373 cache_ptr->howto = &elf32_s390_vtentry_howto;
374 break;
375
376 default:
377 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
378 {
379 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
380 abfd, (int) r_type);
381 r_type = R_390_NONE;
382 }
383 cache_ptr->howto = &elf_howto_table[r_type];
384 }
385 }
386
387 /* A relocation function which doesn't do anything. */
388 static bfd_reloc_status_type
389 s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section,
390 output_bfd, error_message)
391 bfd *abfd ATTRIBUTE_UNUSED;
392 arelent *reloc_entry;
393 asymbol *symbol ATTRIBUTE_UNUSED;
394 PTR data ATTRIBUTE_UNUSED;
395 asection *input_section;
396 bfd *output_bfd;
397 char **error_message ATTRIBUTE_UNUSED;
398 {
399 if (output_bfd)
400 reloc_entry->address += input_section->output_offset;
401 return bfd_reloc_ok;
402 }
403
404 /* Handle the large displacement relocs. */
405 static bfd_reloc_status_type
406 s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section,
407 output_bfd, error_message)
408 bfd *abfd ATTRIBUTE_UNUSED;
409 arelent *reloc_entry;
410 asymbol *symbol;
411 PTR data ATTRIBUTE_UNUSED;
412 asection *input_section;
413 bfd *output_bfd;
414 char **error_message ATTRIBUTE_UNUSED;
415 {
416 reloc_howto_type *howto = reloc_entry->howto;
417 bfd_vma relocation;
418 bfd_vma insn;
419
420 if (output_bfd != (bfd *) NULL
421 && (symbol->flags & BSF_SECTION_SYM) == 0
422 && (! howto->partial_inplace
423 || reloc_entry->addend == 0))
424 {
425 reloc_entry->address += input_section->output_offset;
426 return bfd_reloc_ok;
427 }
428
429 if (output_bfd != NULL)
430 return bfd_reloc_continue;
431
432 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
433 return bfd_reloc_outofrange;
434
435 relocation = (symbol->value
436 + symbol->section->output_section->vma
437 + symbol->section->output_offset);
438 relocation += reloc_entry->addend;
439 if (howto->pc_relative)
440 {
441 relocation -= (input_section->output_section->vma
442 + input_section->output_offset);
443 relocation -= reloc_entry->address;
444 }
445
446 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
447 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
448 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
449
450 if ((bfd_signed_vma) relocation < - 0x80000
451 || (bfd_signed_vma) relocation > 0x7ffff)
452 return bfd_reloc_overflow;
453 else
454 return bfd_reloc_ok;
455 }
456
457 static bfd_boolean
458 elf_s390_is_local_label_name (abfd, name)
459 bfd *abfd;
460 const char *name;
461 {
462 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
463 return TRUE;
464
465 return _bfd_elf_is_local_label_name (abfd, name);
466 }
467
468 /* Functions for the 390 ELF linker. */
469
470 /* The name of the dynamic interpreter. This is put in the .interp
471 section. */
472
473 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
474
475 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
476 copying dynamic variables from a shared lib into an app's dynbss
477 section, and instead use a dynamic relocation to point into the
478 shared lib. */
479 #define ELIMINATE_COPY_RELOCS 1
480
481 /* The size in bytes of the first entry in the procedure linkage table. */
482 #define PLT_FIRST_ENTRY_SIZE 32
483 /* The size in bytes of an entry in the procedure linkage table. */
484 #define PLT_ENTRY_SIZE 32
485
486 #define GOT_ENTRY_SIZE 4
487
488 /* The first three entries in a procedure linkage table are reserved,
489 and the initial contents are unimportant (we zero them out).
490 Subsequent entries look like this. See the SVR4 ABI 386
491 supplement to see how this works. */
492
493 /* For the s390, simple addr offset can only be 0 - 4096.
494 To use the full 2 GB address space, several instructions
495 are needed to load an address in a register and execute
496 a branch( or just saving the address)
497
498 Furthermore, only r 0 and 1 are free to use!!! */
499
500 /* The first 3 words in the GOT are then reserved.
501 Word 0 is the address of the dynamic table.
502 Word 1 is a pointer to a structure describing the object
503 Word 2 is used to point to the loader entry address.
504
505 The code for position independent PLT entries looks like this:
506
507 r12 holds addr of the current GOT at entry to the PLT
508
509 The GOT holds the address in the PLT to be executed.
510 The loader then gets:
511 24(15) = Pointer to the structure describing the object.
512 28(15) = Offset in symbol table
513
514 The loader must then find the module where the function is
515 and insert the address in the GOT.
516
517 Note: 390 can only address +- 64 K relative.
518 We check if offset > 65536, then make a relative branch -64xxx
519 back to a previous defined branch
520
521 PLT1: BASR 1,0 # 2 bytes
522 L 1,22(1) # 4 bytes Load offset in GOT in r 1
523 L 1,(1,12) # 4 bytes Load address from GOT in r1
524 BCR 15,1 # 2 bytes Jump to address
525 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
526 L 1,14(1) # 4 bytes Load offset in symol table in r1
527 BRC 15,-x # 4 bytes Jump to start of PLT
528 .word 0 # 2 bytes filler
529 .long ? # 4 bytes offset in GOT
530 .long ? # 4 bytes offset into symbol table
531
532 This was the general case. There are two additional, optimizes PLT
533 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768.
534 First the one for GOT offsets < 4096:
535
536 PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1
537 BCR 15,1 # 2 bytes Jump to address
538 .word 0,0,0 # 6 bytes filler
539 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
540 L 1,14(1) # 4 bytes Load offset in symbol table in r1
541 BRC 15,-x # 4 bytes Jump to start of PLT
542 .word 0,0,0 # 6 bytes filler
543 .long ? # 4 bytes offset into symbol table
544
545 Second the one for GOT offsets < 32768:
546
547 PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1
548 L 1,(1,12) # 4 bytes Load address from GOT to r1
549 BCR 15,1 # 2 bytes Jump to address
550 .word 0 # 2 bytes filler
551 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
552 L 1,14(1) # 4 bytes Load offset in symbol table in r1
553 BRC 15,-x # 4 bytes Jump to start of PLT
554 .word 0,0,0 # 6 bytes filler
555 .long ? # 4 bytes offset into symbol table
556
557 Total = 32 bytes per PLT entry
558
559 The code for static build PLT entries looks like this:
560
561 PLT1: BASR 1,0 # 2 bytes
562 L 1,22(1) # 4 bytes Load address of GOT entry
563 L 1,0(0,1) # 4 bytes Load address from GOT in r1
564 BCR 15,1 # 2 bytes Jump to address
565 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
566 L 1,14(1) # 4 bytes Load offset in symbol table in r1
567 BRC 15,-x # 4 bytes Jump to start of PLT
568 .word 0 # 2 bytes filler
569 .long ? # 4 bytes address of GOT entry
570 .long ? # 4 bytes offset into symbol table */
571
572 #define PLT_PIC_ENTRY_WORD0 0x0d105810
573 #define PLT_PIC_ENTRY_WORD1 0x10165811
574 #define PLT_PIC_ENTRY_WORD2 0xc00007f1
575 #define PLT_PIC_ENTRY_WORD3 0x0d105810
576 #define PLT_PIC_ENTRY_WORD4 0x100ea7f4
577
578 #define PLT_PIC12_ENTRY_WORD0 0x5810c000
579 #define PLT_PIC12_ENTRY_WORD1 0x07f10000
580 #define PLT_PIC12_ENTRY_WORD2 0x00000000
581 #define PLT_PIC12_ENTRY_WORD3 0x0d105810
582 #define PLT_PIC12_ENTRY_WORD4 0x100ea7f4
583
584 #define PLT_PIC16_ENTRY_WORD0 0xa7180000
585 #define PLT_PIC16_ENTRY_WORD1 0x5811c000
586 #define PLT_PIC16_ENTRY_WORD2 0x07f10000
587 #define PLT_PIC16_ENTRY_WORD3 0x0d105810
588 #define PLT_PIC16_ENTRY_WORD4 0x100ea7f4
589
590 #define PLT_ENTRY_WORD0 0x0d105810
591 #define PLT_ENTRY_WORD1 0x10165810
592 #define PLT_ENTRY_WORD2 0x100007f1
593 #define PLT_ENTRY_WORD3 0x0d105810
594 #define PLT_ENTRY_WORD4 0x100ea7f4
595
596 /* The first PLT entry pushes the offset into the symbol table
597 from R1 onto the stack at 8(15) and the loader object info
598 at 12(15), loads the loader address in R1 and jumps to it. */
599
600 /* The first entry in the PLT for PIC code:
601
602 PLT0:
603 ST 1,28(15) # R1 has offset into symbol table
604 L 1,4(12) # Get loader ino(object struct address)
605 ST 1,24(15) # Store address
606 L 1,8(12) # Entry address of loader in R1
607 BR 1 # Jump to loader
608
609 The first entry in the PLT for static code:
610
611 PLT0:
612 ST 1,28(15) # R1 has offset into symbol table
613 BASR 1,0
614 L 1,18(0,1) # Get address of GOT
615 MVC 24(4,15),4(1) # Move loader ino to stack
616 L 1,8(1) # Get address of loader
617 BR 1 # Jump to loader
618 .word 0 # filler
619 .long got # address of GOT */
620
621 #define PLT_PIC_FIRST_ENTRY_WORD0 0x5010f01c
622 #define PLT_PIC_FIRST_ENTRY_WORD1 0x5810c004
623 #define PLT_PIC_FIRST_ENTRY_WORD2 0x5010f018
624 #define PLT_PIC_FIRST_ENTRY_WORD3 0x5810c008
625 #define PLT_PIC_FIRST_ENTRY_WORD4 0x07f10000
626
627 #define PLT_FIRST_ENTRY_WORD0 0x5010f01c
628 #define PLT_FIRST_ENTRY_WORD1 0x0d105810
629 #define PLT_FIRST_ENTRY_WORD2 0x1012D203
630 #define PLT_FIRST_ENTRY_WORD3 0xf0181004
631 #define PLT_FIRST_ENTRY_WORD4 0x58101008
632 #define PLT_FIRST_ENTRY_WORD5 0x07f10000
633
634 /* The s390 linker needs to keep track of the number of relocs that it
635 decides to copy as dynamic relocs in check_relocs for each symbol.
636 This is so that it can later discard them if they are found to be
637 unnecessary. We store the information in a field extending the
638 regular ELF linker hash table. */
639
640 struct elf_s390_dyn_relocs
641 {
642 struct elf_s390_dyn_relocs *next;
643
644 /* The input section of the reloc. */
645 asection *sec;
646
647 /* Total number of relocs copied for the input section. */
648 bfd_size_type count;
649
650 /* Number of pc-relative relocs copied for the input section. */
651 bfd_size_type pc_count;
652 };
653
654 /* s390 ELF linker hash entry. */
655
656 struct elf_s390_link_hash_entry
657 {
658 struct elf_link_hash_entry elf;
659
660 /* Track dynamic relocs copied for this symbol. */
661 struct elf_s390_dyn_relocs *dyn_relocs;
662
663 /* Number of GOTPLT references for a function. */
664 bfd_signed_vma gotplt_refcount;
665
666 #define GOT_UNKNOWN 0
667 #define GOT_NORMAL 1
668 #define GOT_TLS_GD 2
669 #define GOT_TLS_IE 3
670 #define GOT_TLS_IE_NLT 4
671 unsigned char tls_type;
672 };
673
674 #define elf_s390_hash_entry(ent) \
675 ((struct elf_s390_link_hash_entry *)(ent))
676
677 /* NOTE: Keep this structure in sync with
678 the one declared in elf64-s390.c. */
679 struct elf_s390_obj_tdata
680 {
681 struct elf_obj_tdata root;
682
683 /* TLS type for each local got entry. */
684 char *local_got_tls_type;
685 };
686
687 #define elf_s390_tdata(abfd) \
688 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
689
690 #define elf_s390_local_got_tls_type(abfd) \
691 (elf_s390_tdata (abfd)->local_got_tls_type)
692
693 #define is_s390_elf(bfd) \
694 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
695 && elf_tdata (bfd) != NULL \
696 && elf_object_id (bfd) == S390_ELF_TDATA)
697
698 static bfd_boolean
699 elf_s390_mkobject (bfd *abfd)
700 {
701 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata),
702 S390_ELF_TDATA);
703 }
704
705 static bfd_boolean
706 elf_s390_object_p (abfd)
707 bfd *abfd;
708 {
709 /* Set the right machine number for an s390 elf32 file. */
710 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31);
711 }
712
713 /* s390 ELF linker hash table. */
714
715 struct elf_s390_link_hash_table
716 {
717 struct elf_link_hash_table elf;
718
719 /* Short-cuts to get to dynamic linker sections. */
720 asection *sgot;
721 asection *sgotplt;
722 asection *srelgot;
723 asection *splt;
724 asection *srelplt;
725 asection *sdynbss;
726 asection *srelbss;
727
728 union {
729 bfd_signed_vma refcount;
730 bfd_vma offset;
731 } tls_ldm_got;
732
733 /* Small local sym to section mapping cache. */
734 struct sym_sec_cache sym_sec;
735 };
736
737 /* Get the s390 ELF linker hash table from a link_info structure. */
738
739 #define elf_s390_hash_table(p) \
740 ((struct elf_s390_link_hash_table *) ((p)->hash))
741
742 /* Create an entry in an s390 ELF linker hash table. */
743
744 static struct bfd_hash_entry *
745 link_hash_newfunc (entry, table, string)
746 struct bfd_hash_entry *entry;
747 struct bfd_hash_table *table;
748 const char *string;
749 {
750 /* Allocate the structure if it has not already been allocated by a
751 subclass. */
752 if (entry == NULL)
753 {
754 entry = bfd_hash_allocate (table,
755 sizeof (struct elf_s390_link_hash_entry));
756 if (entry == NULL)
757 return entry;
758 }
759
760 /* Call the allocation method of the superclass. */
761 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
762 if (entry != NULL)
763 {
764 struct elf_s390_link_hash_entry *eh;
765
766 eh = (struct elf_s390_link_hash_entry *) entry;
767 eh->dyn_relocs = NULL;
768 eh->gotplt_refcount = 0;
769 eh->tls_type = GOT_UNKNOWN;
770 }
771
772 return entry;
773 }
774
775 /* Create an s390 ELF linker hash table. */
776
777 static struct bfd_link_hash_table *
778 elf_s390_link_hash_table_create (abfd)
779 bfd *abfd;
780 {
781 struct elf_s390_link_hash_table *ret;
782 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
783
784 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
785 if (ret == NULL)
786 return NULL;
787
788 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
789 sizeof (struct elf_s390_link_hash_entry)))
790 {
791 free (ret);
792 return NULL;
793 }
794
795 ret->sgot = NULL;
796 ret->sgotplt = NULL;
797 ret->srelgot = NULL;
798 ret->splt = NULL;
799 ret->srelplt = NULL;
800 ret->sdynbss = NULL;
801 ret->srelbss = NULL;
802 ret->tls_ldm_got.refcount = 0;
803 ret->sym_sec.abfd = NULL;
804
805 return &ret->elf.root;
806 }
807
808 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
809 shortcuts to them in our hash table. */
810
811 static bfd_boolean
812 create_got_section (dynobj, info)
813 bfd *dynobj;
814 struct bfd_link_info *info;
815 {
816 struct elf_s390_link_hash_table *htab;
817
818 if (! _bfd_elf_create_got_section (dynobj, info))
819 return FALSE;
820
821 htab = elf_s390_hash_table (info);
822 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
823 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
824 if (!htab->sgot || !htab->sgotplt)
825 abort ();
826
827 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got",
828 (SEC_ALLOC | SEC_LOAD
829 | SEC_HAS_CONTENTS
830 | SEC_IN_MEMORY
831 | SEC_LINKER_CREATED
832 | SEC_READONLY));
833 if (htab->srelgot == NULL
834 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
835 return FALSE;
836 return TRUE;
837 }
838
839 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
840 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
841 hash table. */
842
843 static bfd_boolean
844 elf_s390_create_dynamic_sections (dynobj, info)
845 bfd *dynobj;
846 struct bfd_link_info *info;
847 {
848 struct elf_s390_link_hash_table *htab;
849
850 htab = elf_s390_hash_table (info);
851 if (!htab->sgot && !create_got_section (dynobj, info))
852 return FALSE;
853
854 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
855 return FALSE;
856
857 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
858 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
859 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
860 if (!info->shared)
861 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
862
863 if (!htab->splt || !htab->srelplt || !htab->sdynbss
864 || (!info->shared && !htab->srelbss))
865 abort ();
866
867 return TRUE;
868 }
869
870 /* Copy the extra info we tack onto an elf_link_hash_entry. */
871
872 static void
873 elf_s390_copy_indirect_symbol (info, dir, ind)
874 struct bfd_link_info *info;
875 struct elf_link_hash_entry *dir, *ind;
876 {
877 struct elf_s390_link_hash_entry *edir, *eind;
878
879 edir = (struct elf_s390_link_hash_entry *) dir;
880 eind = (struct elf_s390_link_hash_entry *) ind;
881
882 if (eind->dyn_relocs != NULL)
883 {
884 if (edir->dyn_relocs != NULL)
885 {
886 struct elf_s390_dyn_relocs **pp;
887 struct elf_s390_dyn_relocs *p;
888
889 /* Add reloc counts against the indirect sym to the direct sym
890 list. Merge any entries against the same section. */
891 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
892 {
893 struct elf_s390_dyn_relocs *q;
894
895 for (q = edir->dyn_relocs; q != NULL; q = q->next)
896 if (q->sec == p->sec)
897 {
898 q->pc_count += p->pc_count;
899 q->count += p->count;
900 *pp = p->next;
901 break;
902 }
903 if (q == NULL)
904 pp = &p->next;
905 }
906 *pp = edir->dyn_relocs;
907 }
908
909 edir->dyn_relocs = eind->dyn_relocs;
910 eind->dyn_relocs = NULL;
911 }
912
913 if (ind->root.type == bfd_link_hash_indirect
914 && dir->got.refcount <= 0)
915 {
916 edir->tls_type = eind->tls_type;
917 eind->tls_type = GOT_UNKNOWN;
918 }
919
920 if (ELIMINATE_COPY_RELOCS
921 && ind->root.type != bfd_link_hash_indirect
922 && dir->dynamic_adjusted)
923 {
924 /* If called to transfer flags for a weakdef during processing
925 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
926 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
927 dir->ref_dynamic |= ind->ref_dynamic;
928 dir->ref_regular |= ind->ref_regular;
929 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
930 dir->needs_plt |= ind->needs_plt;
931 }
932 else
933 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
934 }
935
936 static int
937 elf_s390_tls_transition (info, r_type, is_local)
938 struct bfd_link_info *info;
939 int r_type;
940 int is_local;
941 {
942 if (info->shared)
943 return r_type;
944
945 switch (r_type)
946 {
947 case R_390_TLS_GD32:
948 case R_390_TLS_IE32:
949 if (is_local)
950 return R_390_TLS_LE32;
951 return R_390_TLS_IE32;
952 case R_390_TLS_GOTIE32:
953 if (is_local)
954 return R_390_TLS_LE32;
955 return R_390_TLS_GOTIE32;
956 case R_390_TLS_LDM32:
957 return R_390_TLS_LE32;
958 }
959
960 return r_type;
961 }
962
963 /* Look through the relocs for a section during the first phase, and
964 allocate space in the global offset table or procedure linkage
965 table. */
966
967 static bfd_boolean
968 elf_s390_check_relocs (abfd, info, sec, relocs)
969 bfd *abfd;
970 struct bfd_link_info *info;
971 asection *sec;
972 const Elf_Internal_Rela *relocs;
973 {
974 struct elf_s390_link_hash_table *htab;
975 Elf_Internal_Shdr *symtab_hdr;
976 struct elf_link_hash_entry **sym_hashes;
977 const Elf_Internal_Rela *rel;
978 const Elf_Internal_Rela *rel_end;
979 asection *sreloc;
980 bfd_signed_vma *local_got_refcounts;
981 int tls_type, old_tls_type;
982
983 if (info->relocatable)
984 return TRUE;
985
986 BFD_ASSERT (is_s390_elf (abfd));
987
988 htab = elf_s390_hash_table (info);
989 symtab_hdr = &elf_symtab_hdr (abfd);
990 sym_hashes = elf_sym_hashes (abfd);
991 local_got_refcounts = elf_local_got_refcounts (abfd);
992
993 sreloc = NULL;
994
995 rel_end = relocs + sec->reloc_count;
996 for (rel = relocs; rel < rel_end; rel++)
997 {
998 unsigned int r_type;
999 unsigned long r_symndx;
1000 struct elf_link_hash_entry *h;
1001
1002 r_symndx = ELF32_R_SYM (rel->r_info);
1003
1004 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1005 {
1006 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1007 abfd, r_symndx);
1008 return FALSE;
1009 }
1010
1011 if (r_symndx < symtab_hdr->sh_info)
1012 h = NULL;
1013 else
1014 {
1015 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1016 while (h->root.type == bfd_link_hash_indirect
1017 || h->root.type == bfd_link_hash_warning)
1018 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1019 }
1020
1021 /* Create got section and local_got_refcounts array if they
1022 are needed. */
1023 r_type = elf_s390_tls_transition (info,
1024 ELF32_R_TYPE (rel->r_info),
1025 h == NULL);
1026 switch (r_type)
1027 {
1028 case R_390_GOT12:
1029 case R_390_GOT16:
1030 case R_390_GOT20:
1031 case R_390_GOT32:
1032 case R_390_GOTENT:
1033 case R_390_GOTPLT12:
1034 case R_390_GOTPLT16:
1035 case R_390_GOTPLT20:
1036 case R_390_GOTPLT32:
1037 case R_390_GOTPLTENT:
1038 case R_390_TLS_GD32:
1039 case R_390_TLS_GOTIE12:
1040 case R_390_TLS_GOTIE20:
1041 case R_390_TLS_GOTIE32:
1042 case R_390_TLS_IEENT:
1043 case R_390_TLS_IE32:
1044 case R_390_TLS_LDM32:
1045 if (h == NULL
1046 && local_got_refcounts == NULL)
1047 {
1048 bfd_size_type size;
1049
1050 size = symtab_hdr->sh_info;
1051 size *= (sizeof (bfd_signed_vma) + sizeof(char));
1052 local_got_refcounts = ((bfd_signed_vma *)
1053 bfd_zalloc (abfd, size));
1054 if (local_got_refcounts == NULL)
1055 return FALSE;
1056 elf_local_got_refcounts (abfd) = local_got_refcounts;
1057 elf_s390_local_got_tls_type (abfd)
1058 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1059 }
1060 /* Fall through. */
1061 case R_390_GOTOFF16:
1062 case R_390_GOTOFF32:
1063 case R_390_GOTPC:
1064 case R_390_GOTPCDBL:
1065 if (htab->sgot == NULL)
1066 {
1067 if (htab->elf.dynobj == NULL)
1068 htab->elf.dynobj = abfd;
1069 if (!create_got_section (htab->elf.dynobj, info))
1070 return FALSE;
1071 }
1072 }
1073
1074 switch (r_type)
1075 {
1076 case R_390_GOTOFF16:
1077 case R_390_GOTOFF32:
1078 case R_390_GOTPC:
1079 case R_390_GOTPCDBL:
1080 /* Got is created, nothing to be done. */
1081 break;
1082
1083 case R_390_PLT16DBL:
1084 case R_390_PLT32DBL:
1085 case R_390_PLT32:
1086 case R_390_PLTOFF16:
1087 case R_390_PLTOFF32:
1088 /* This symbol requires a procedure linkage table entry. We
1089 actually build the entry in adjust_dynamic_symbol,
1090 because this might be a case of linking PIC code which is
1091 never referenced by a dynamic object, in which case we
1092 don't need to generate a procedure linkage table entry
1093 after all. */
1094
1095 /* If this is a local symbol, we resolve it directly without
1096 creating a procedure linkage table entry. */
1097 if (h != NULL)
1098 {
1099 h->needs_plt = 1;
1100 h->plt.refcount += 1;
1101 }
1102 break;
1103
1104 case R_390_GOTPLT12:
1105 case R_390_GOTPLT16:
1106 case R_390_GOTPLT20:
1107 case R_390_GOTPLT32:
1108 case R_390_GOTPLTENT:
1109 /* This symbol requires either a procedure linkage table entry
1110 or an entry in the local got. We actually build the entry
1111 in adjust_dynamic_symbol because whether this is really a
1112 global reference can change and with it the fact if we have
1113 to create a plt entry or a local got entry. To be able to
1114 make a once global symbol a local one we have to keep track
1115 of the number of gotplt references that exist for this
1116 symbol. */
1117 if (h != NULL)
1118 {
1119 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1120 h->needs_plt = 1;
1121 h->plt.refcount += 1;
1122 }
1123 else
1124 local_got_refcounts[r_symndx] += 1;
1125 break;
1126
1127 case R_390_TLS_LDM32:
1128 htab->tls_ldm_got.refcount += 1;
1129 break;
1130
1131 case R_390_TLS_IE32:
1132 case R_390_TLS_GOTIE12:
1133 case R_390_TLS_GOTIE20:
1134 case R_390_TLS_GOTIE32:
1135 case R_390_TLS_IEENT:
1136 if (info->shared)
1137 info->flags |= DF_STATIC_TLS;
1138 /* Fall through. */
1139
1140 case R_390_GOT12:
1141 case R_390_GOT16:
1142 case R_390_GOT20:
1143 case R_390_GOT32:
1144 case R_390_GOTENT:
1145 case R_390_TLS_GD32:
1146 /* This symbol requires a global offset table entry. */
1147 switch (r_type)
1148 {
1149 default:
1150 case R_390_GOT12:
1151 case R_390_GOT16:
1152 case R_390_GOT20:
1153 case R_390_GOT32:
1154 case R_390_GOTENT:
1155 tls_type = GOT_NORMAL;
1156 break;
1157 case R_390_TLS_GD32:
1158 tls_type = GOT_TLS_GD;
1159 break;
1160 case R_390_TLS_IE32:
1161 case R_390_TLS_GOTIE32:
1162 tls_type = GOT_TLS_IE;
1163 break;
1164 case R_390_TLS_GOTIE12:
1165 case R_390_TLS_GOTIE20:
1166 case R_390_TLS_IEENT:
1167 tls_type = GOT_TLS_IE_NLT;
1168 break;
1169 }
1170
1171 if (h != NULL)
1172 {
1173 h->got.refcount += 1;
1174 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1175 }
1176 else
1177 {
1178 local_got_refcounts[r_symndx] += 1;
1179 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1180 }
1181 /* If a TLS symbol is accessed using IE at least once,
1182 there is no point to use dynamic model for it. */
1183 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1184 {
1185 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1186 {
1187 (*_bfd_error_handler)
1188 (_("%B: `%s' accessed both as normal and thread local symbol"),
1189 abfd, h->root.root.string);
1190 return FALSE;
1191 }
1192 if (old_tls_type > tls_type)
1193 tls_type = old_tls_type;
1194 }
1195
1196 if (old_tls_type != tls_type)
1197 {
1198 if (h != NULL)
1199 elf_s390_hash_entry (h)->tls_type = tls_type;
1200 else
1201 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1202 }
1203
1204 if (r_type != R_390_TLS_IE32)
1205 break;
1206 /* Fall through. */
1207
1208 case R_390_TLS_LE32:
1209 if (!info->shared)
1210 break;
1211 info->flags |= DF_STATIC_TLS;
1212 /* Fall through. */
1213
1214 case R_390_8:
1215 case R_390_16:
1216 case R_390_32:
1217 case R_390_PC16:
1218 case R_390_PC16DBL:
1219 case R_390_PC32DBL:
1220 case R_390_PC32:
1221 if (h != NULL && !info->shared)
1222 {
1223 /* If this reloc is in a read-only section, we might
1224 need a copy reloc. We can't check reliably at this
1225 stage whether the section is read-only, as input
1226 sections have not yet been mapped to output sections.
1227 Tentatively set the flag for now, and correct in
1228 adjust_dynamic_symbol. */
1229 h->non_got_ref = 1;
1230
1231 /* We may need a .plt entry if the function this reloc
1232 refers to is in a shared lib. */
1233 h->plt.refcount += 1;
1234 }
1235
1236 /* If we are creating a shared library, and this is a reloc
1237 against a global symbol, or a non PC relative reloc
1238 against a local symbol, then we need to copy the reloc
1239 into the shared library. However, if we are linking with
1240 -Bsymbolic, we do not need to copy a reloc against a
1241 global symbol which is defined in an object we are
1242 including in the link (i.e., DEF_REGULAR is set). At
1243 this point we have not seen all the input files, so it is
1244 possible that DEF_REGULAR is not set now but will be set
1245 later (it is never cleared). In case of a weak definition,
1246 DEF_REGULAR may be cleared later by a strong definition in
1247 a shared library. We account for that possibility below by
1248 storing information in the relocs_copied field of the hash
1249 table entry. A similar situation occurs when creating
1250 shared libraries and symbol visibility changes render the
1251 symbol local.
1252
1253 If on the other hand, we are creating an executable, we
1254 may need to keep relocations for symbols satisfied by a
1255 dynamic library if we manage to avoid copy relocs for the
1256 symbol. */
1257 if ((info->shared
1258 && (sec->flags & SEC_ALLOC) != 0
1259 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16
1260 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL
1261 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL
1262 && ELF32_R_TYPE (rel->r_info) != R_390_PC32)
1263 || (h != NULL
1264 && (! SYMBOLIC_BIND (info, h)
1265 || h->root.type == bfd_link_hash_defweak
1266 || !h->def_regular))))
1267 || (ELIMINATE_COPY_RELOCS
1268 && !info->shared
1269 && (sec->flags & SEC_ALLOC) != 0
1270 && h != NULL
1271 && (h->root.type == bfd_link_hash_defweak
1272 || !h->def_regular)))
1273 {
1274 struct elf_s390_dyn_relocs *p;
1275 struct elf_s390_dyn_relocs **head;
1276
1277 /* We must copy these reloc types into the output file.
1278 Create a reloc section in dynobj and make room for
1279 this reloc. */
1280 if (sreloc == NULL)
1281 {
1282 if (htab->elf.dynobj == NULL)
1283 htab->elf.dynobj = abfd;
1284
1285 sreloc = _bfd_elf_make_dynamic_reloc_section
1286 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ TRUE);
1287
1288 if (sreloc == NULL)
1289 return FALSE;
1290 }
1291
1292 /* If this is a global symbol, we count the number of
1293 relocations we need for this symbol. */
1294 if (h != NULL)
1295 {
1296 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1297 }
1298 else
1299 {
1300 /* Track dynamic relocs needed for local syms too.
1301 We really need local syms available to do this
1302 easily. Oh well. */
1303 asection *s;
1304 void *vpp;
1305
1306 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1307 sec, r_symndx);
1308 if (s == NULL)
1309 return FALSE;
1310
1311 vpp = &elf_section_data (s)->local_dynrel;
1312 head = (struct elf_s390_dyn_relocs **) vpp;
1313 }
1314
1315 p = *head;
1316 if (p == NULL || p->sec != sec)
1317 {
1318 bfd_size_type amt = sizeof *p;
1319
1320 p = ((struct elf_s390_dyn_relocs *)
1321 bfd_alloc (htab->elf.dynobj, amt));
1322 if (p == NULL)
1323 return FALSE;
1324 p->next = *head;
1325 *head = p;
1326 p->sec = sec;
1327 p->count = 0;
1328 p->pc_count = 0;
1329 }
1330
1331 p->count += 1;
1332 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
1333 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
1334 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
1335 || ELF32_R_TYPE (rel->r_info) == R_390_PC32)
1336 p->pc_count += 1;
1337 }
1338 break;
1339
1340 /* This relocation describes the C++ object vtable hierarchy.
1341 Reconstruct it for later use during GC. */
1342 case R_390_GNU_VTINHERIT:
1343 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1344 return FALSE;
1345 break;
1346
1347 /* This relocation describes which C++ vtable entries are actually
1348 used. Record for later use during GC. */
1349 case R_390_GNU_VTENTRY:
1350 BFD_ASSERT (h != NULL);
1351 if (h != NULL
1352 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1353 return FALSE;
1354 break;
1355
1356 default:
1357 break;
1358 }
1359 }
1360
1361 return TRUE;
1362 }
1363
1364 /* Return the section that should be marked against GC for a given
1365 relocation. */
1366
1367 static asection *
1368 elf_s390_gc_mark_hook (asection *sec,
1369 struct bfd_link_info *info,
1370 Elf_Internal_Rela *rel,
1371 struct elf_link_hash_entry *h,
1372 Elf_Internal_Sym *sym)
1373 {
1374 if (h != NULL)
1375 switch (ELF32_R_TYPE (rel->r_info))
1376 {
1377 case R_390_GNU_VTINHERIT:
1378 case R_390_GNU_VTENTRY:
1379 return NULL;
1380 }
1381 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1382
1383 }
1384
1385 /* Update the got entry reference counts for the section being removed. */
1386
1387 static bfd_boolean
1388 elf_s390_gc_sweep_hook (bfd *abfd,
1389 struct bfd_link_info *info,
1390 asection *sec,
1391 const Elf_Internal_Rela *relocs)
1392 {
1393 Elf_Internal_Shdr *symtab_hdr;
1394 struct elf_link_hash_entry **sym_hashes;
1395 bfd_signed_vma *local_got_refcounts;
1396 const Elf_Internal_Rela *rel, *relend;
1397
1398 if (info->relocatable)
1399 return TRUE;
1400
1401 elf_section_data (sec)->local_dynrel = NULL;
1402
1403 symtab_hdr = &elf_symtab_hdr (abfd);
1404 sym_hashes = elf_sym_hashes (abfd);
1405 local_got_refcounts = elf_local_got_refcounts (abfd);
1406
1407 relend = relocs + sec->reloc_count;
1408 for (rel = relocs; rel < relend; rel++)
1409 {
1410 unsigned long r_symndx;
1411 unsigned int r_type;
1412 struct elf_link_hash_entry *h = NULL;
1413
1414 r_symndx = ELF32_R_SYM (rel->r_info);
1415 if (r_symndx >= symtab_hdr->sh_info)
1416 {
1417 struct elf_s390_link_hash_entry *eh;
1418 struct elf_s390_dyn_relocs **pp;
1419 struct elf_s390_dyn_relocs *p;
1420
1421 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1422 while (h->root.type == bfd_link_hash_indirect
1423 || h->root.type == bfd_link_hash_warning)
1424 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1425 eh = (struct elf_s390_link_hash_entry *) h;
1426
1427 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1428 if (p->sec == sec)
1429 {
1430 /* Everything must go for SEC. */
1431 *pp = p->next;
1432 break;
1433 }
1434 }
1435
1436 r_type = ELF32_R_TYPE (rel->r_info);
1437 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1438 switch (r_type)
1439 {
1440 case R_390_TLS_LDM32:
1441 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1442 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1443 break;
1444
1445 case R_390_TLS_GD32:
1446 case R_390_TLS_IE32:
1447 case R_390_TLS_GOTIE12:
1448 case R_390_TLS_GOTIE20:
1449 case R_390_TLS_GOTIE32:
1450 case R_390_TLS_IEENT:
1451 case R_390_GOT12:
1452 case R_390_GOT16:
1453 case R_390_GOT20:
1454 case R_390_GOT32:
1455 case R_390_GOTOFF16:
1456 case R_390_GOTOFF32:
1457 case R_390_GOTPC:
1458 case R_390_GOTPCDBL:
1459 case R_390_GOTENT:
1460 if (h != NULL)
1461 {
1462 if (h->got.refcount > 0)
1463 h->got.refcount -= 1;
1464 }
1465 else if (local_got_refcounts != NULL)
1466 {
1467 if (local_got_refcounts[r_symndx] > 0)
1468 local_got_refcounts[r_symndx] -= 1;
1469 }
1470 break;
1471
1472 case R_390_8:
1473 case R_390_12:
1474 case R_390_16:
1475 case R_390_20:
1476 case R_390_32:
1477 case R_390_PC16:
1478 case R_390_PC16DBL:
1479 case R_390_PC32DBL:
1480 case R_390_PC32:
1481 if (info->shared)
1482 break;
1483 /* Fall through. */
1484
1485 case R_390_PLT16DBL:
1486 case R_390_PLT32DBL:
1487 case R_390_PLT32:
1488 case R_390_PLTOFF16:
1489 case R_390_PLTOFF32:
1490 if (h != NULL)
1491 {
1492 if (h->plt.refcount > 0)
1493 h->plt.refcount -= 1;
1494 }
1495 break;
1496
1497 case R_390_GOTPLT12:
1498 case R_390_GOTPLT16:
1499 case R_390_GOTPLT20:
1500 case R_390_GOTPLT32:
1501 case R_390_GOTPLTENT:
1502 if (h != NULL)
1503 {
1504 if (h->plt.refcount > 0)
1505 {
1506 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1507 h->plt.refcount -= 1;
1508 }
1509 }
1510 else if (local_got_refcounts != NULL)
1511 {
1512 if (local_got_refcounts[r_symndx] > 0)
1513 local_got_refcounts[r_symndx] -= 1;
1514 }
1515 break;
1516
1517 default:
1518 break;
1519 }
1520 }
1521
1522 return TRUE;
1523 }
1524
1525 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1526 entry but we found we will not create any. Called when we find we will
1527 not have any PLT for this symbol, by for example
1528 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1529 or elf_s390_size_dynamic_sections if no dynamic sections will be
1530 created (we're only linking static objects). */
1531
1532 static void
1533 elf_s390_adjust_gotplt (h)
1534 struct elf_s390_link_hash_entry *h;
1535 {
1536 if (h->elf.root.type == bfd_link_hash_warning)
1537 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1538
1539 if (h->gotplt_refcount <= 0)
1540 return;
1541
1542 /* We simply add the number of gotplt references to the number
1543 * of got references for this symbol. */
1544 h->elf.got.refcount += h->gotplt_refcount;
1545 h->gotplt_refcount = -1;
1546 }
1547
1548 /* Adjust a symbol defined by a dynamic object and referenced by a
1549 regular object. The current definition is in some section of the
1550 dynamic object, but we're not including those sections. We have to
1551 change the definition to something the rest of the link can
1552 understand. */
1553
1554 static bfd_boolean
1555 elf_s390_adjust_dynamic_symbol (info, h)
1556 struct bfd_link_info *info;
1557 struct elf_link_hash_entry *h;
1558 {
1559 struct elf_s390_link_hash_table *htab;
1560 asection *s;
1561
1562 /* If this is a function, put it in the procedure linkage table. We
1563 will fill in the contents of the procedure linkage table later
1564 (although we could actually do it here). */
1565 if (h->type == STT_FUNC
1566 || h->needs_plt)
1567 {
1568 if (h->plt.refcount <= 0
1569 || SYMBOL_CALLS_LOCAL (info, h)
1570 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1571 && h->root.type != bfd_link_hash_undefweak))
1572 {
1573 /* This case can occur if we saw a PLT32 reloc in an input
1574 file, but the symbol was never referred to by a dynamic
1575 object, or if all references were garbage collected. In
1576 such a case, we don't actually need to build a procedure
1577 linkage table, and we can just do a PC32 reloc instead. */
1578 h->plt.offset = (bfd_vma) -1;
1579 h->needs_plt = 0;
1580 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1581 }
1582
1583 return TRUE;
1584 }
1585 else
1586 /* It's possible that we incorrectly decided a .plt reloc was
1587 needed for an R_390_PC32 reloc to a non-function sym in
1588 check_relocs. We can't decide accurately between function and
1589 non-function syms in check-relocs; Objects loaded later in
1590 the link may change h->type. So fix it now. */
1591 h->plt.offset = (bfd_vma) -1;
1592
1593 /* If this is a weak symbol, and there is a real definition, the
1594 processor independent code will have arranged for us to see the
1595 real definition first, and we can just use the same value. */
1596 if (h->u.weakdef != NULL)
1597 {
1598 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1599 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1600 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1601 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1602 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1603 h->non_got_ref = h->u.weakdef->non_got_ref;
1604 return TRUE;
1605 }
1606
1607 /* This is a reference to a symbol defined by a dynamic object which
1608 is not a function. */
1609
1610 /* If we are creating a shared library, we must presume that the
1611 only references to the symbol are via the global offset table.
1612 For such cases we need not do anything here; the relocations will
1613 be handled correctly by relocate_section. */
1614 if (info->shared)
1615 return TRUE;
1616
1617 /* If there are no references to this symbol that do not use the
1618 GOT, we don't need to generate a copy reloc. */
1619 if (!h->non_got_ref)
1620 return TRUE;
1621
1622 /* If -z nocopyreloc was given, we won't generate them either. */
1623 if (info->nocopyreloc)
1624 {
1625 h->non_got_ref = 0;
1626 return TRUE;
1627 }
1628
1629 if (ELIMINATE_COPY_RELOCS)
1630 {
1631 struct elf_s390_link_hash_entry * eh;
1632 struct elf_s390_dyn_relocs *p;
1633
1634 eh = (struct elf_s390_link_hash_entry *) h;
1635 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1636 {
1637 s = p->sec->output_section;
1638 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1639 break;
1640 }
1641
1642 /* If we didn't find any dynamic relocs in read-only sections, then
1643 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1644 if (p == NULL)
1645 {
1646 h->non_got_ref = 0;
1647 return TRUE;
1648 }
1649 }
1650
1651 if (h->size == 0)
1652 {
1653 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1654 h->root.root.string);
1655 return TRUE;
1656 }
1657
1658 /* We must allocate the symbol in our .dynbss section, which will
1659 become part of the .bss section of the executable. There will be
1660 an entry for this symbol in the .dynsym section. The dynamic
1661 object will contain position independent code, so all references
1662 from the dynamic object to this symbol will go through the global
1663 offset table. The dynamic linker will use the .dynsym entry to
1664 determine the address it must put in the global offset table, so
1665 both the dynamic object and the regular object will refer to the
1666 same memory location for the variable. */
1667
1668 htab = elf_s390_hash_table (info);
1669
1670 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1671 copy the initial value out of the dynamic object and into the
1672 runtime process image. */
1673 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1674 {
1675 htab->srelbss->size += sizeof (Elf32_External_Rela);
1676 h->needs_copy = 1;
1677 }
1678
1679 s = htab->sdynbss;
1680
1681 return _bfd_elf_adjust_dynamic_copy (h, s);
1682 }
1683
1684 /* Allocate space in .plt, .got and associated reloc sections for
1685 dynamic relocs. */
1686
1687 static bfd_boolean
1688 allocate_dynrelocs (h, inf)
1689 struct elf_link_hash_entry *h;
1690 PTR inf;
1691 {
1692 struct bfd_link_info *info;
1693 struct elf_s390_link_hash_table *htab;
1694 struct elf_s390_link_hash_entry *eh;
1695 struct elf_s390_dyn_relocs *p;
1696
1697 if (h->root.type == bfd_link_hash_indirect)
1698 return TRUE;
1699
1700 if (h->root.type == bfd_link_hash_warning)
1701 /* When warning symbols are created, they **replace** the "real"
1702 entry in the hash table, thus we never get to see the real
1703 symbol in a hash traversal. So look at it now. */
1704 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1705
1706 info = (struct bfd_link_info *) inf;
1707 htab = elf_s390_hash_table (info);
1708
1709 if (htab->elf.dynamic_sections_created
1710 && h->plt.refcount > 0)
1711 {
1712 /* Make sure this symbol is output as a dynamic symbol.
1713 Undefined weak syms won't yet be marked as dynamic. */
1714 if (h->dynindx == -1
1715 && !h->forced_local)
1716 {
1717 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1718 return FALSE;
1719 }
1720
1721 if (info->shared
1722 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1723 {
1724 asection *s = htab->splt;
1725
1726 /* If this is the first .plt entry, make room for the special
1727 first entry. */
1728 if (s->size == 0)
1729 s->size += PLT_FIRST_ENTRY_SIZE;
1730
1731 h->plt.offset = s->size;
1732
1733 /* If this symbol is not defined in a regular file, and we are
1734 not generating a shared library, then set the symbol to this
1735 location in the .plt. This is required to make function
1736 pointers compare as equal between the normal executable and
1737 the shared library. */
1738 if (! info->shared
1739 && !h->def_regular)
1740 {
1741 h->root.u.def.section = s;
1742 h->root.u.def.value = h->plt.offset;
1743 }
1744
1745 /* Make room for this entry. */
1746 s->size += PLT_ENTRY_SIZE;
1747
1748 /* We also need to make an entry in the .got.plt section, which
1749 will be placed in the .got section by the linker script. */
1750 htab->sgotplt->size += GOT_ENTRY_SIZE;
1751
1752 /* We also need to make an entry in the .rela.plt section. */
1753 htab->srelplt->size += sizeof (Elf32_External_Rela);
1754 }
1755 else
1756 {
1757 h->plt.offset = (bfd_vma) -1;
1758 h->needs_plt = 0;
1759 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1760 }
1761 }
1762 else
1763 {
1764 h->plt.offset = (bfd_vma) -1;
1765 h->needs_plt = 0;
1766 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1767 }
1768
1769 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to
1770 the binary, we can optimize a bit. IE32 and GOTIE32 get converted
1771 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT
1772 we can save the dynamic TLS relocation. */
1773 if (h->got.refcount > 0
1774 && !info->shared
1775 && h->dynindx == -1
1776 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1777 {
1778 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1779 /* For the GOTIE access without a literal pool entry the offset has
1780 to be stored somewhere. The immediate value in the instruction
1781 is not bit enough so the value is stored in the got. */
1782 {
1783 h->got.offset = htab->sgot->size;
1784 htab->sgot->size += GOT_ENTRY_SIZE;
1785 }
1786 else
1787 h->got.offset = (bfd_vma) -1;
1788 }
1789 else if (h->got.refcount > 0)
1790 {
1791 asection *s;
1792 bfd_boolean dyn;
1793 int tls_type = elf_s390_hash_entry(h)->tls_type;
1794
1795 /* Make sure this symbol is output as a dynamic symbol.
1796 Undefined weak syms won't yet be marked as dynamic. */
1797 if (h->dynindx == -1
1798 && !h->forced_local)
1799 {
1800 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1801 return FALSE;
1802 }
1803
1804 s = htab->sgot;
1805 h->got.offset = s->size;
1806 s->size += GOT_ENTRY_SIZE;
1807 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */
1808 if (tls_type == GOT_TLS_GD)
1809 s->size += GOT_ENTRY_SIZE;
1810 dyn = htab->elf.dynamic_sections_created;
1811 /* R_390_TLS_IE32 needs one dynamic relocation,
1812 R_390_TLS_GD32 needs one if local symbol and two if global. */
1813 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1814 || tls_type >= GOT_TLS_IE)
1815 htab->srelgot->size += sizeof (Elf32_External_Rela);
1816 else if (tls_type == GOT_TLS_GD)
1817 htab->srelgot->size += 2 * sizeof (Elf32_External_Rela);
1818 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1819 || h->root.type != bfd_link_hash_undefweak)
1820 && (info->shared
1821 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1822 htab->srelgot->size += sizeof (Elf32_External_Rela);
1823 }
1824 else
1825 h->got.offset = (bfd_vma) -1;
1826
1827 eh = (struct elf_s390_link_hash_entry *) h;
1828 if (eh->dyn_relocs == NULL)
1829 return TRUE;
1830
1831 /* In the shared -Bsymbolic case, discard space allocated for
1832 dynamic pc-relative relocs against symbols which turn out to be
1833 defined in regular objects. For the normal shared case, discard
1834 space for pc-relative relocs that have become local due to symbol
1835 visibility changes. */
1836
1837 if (info->shared)
1838 {
1839 if (SYMBOL_CALLS_LOCAL (info, h))
1840 {
1841 struct elf_s390_dyn_relocs **pp;
1842
1843 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1844 {
1845 p->count -= p->pc_count;
1846 p->pc_count = 0;
1847 if (p->count == 0)
1848 *pp = p->next;
1849 else
1850 pp = &p->next;
1851 }
1852 }
1853
1854 /* Also discard relocs on undefined weak syms with non-default
1855 visibility. */
1856 if (eh->dyn_relocs != NULL
1857 && h->root.type == bfd_link_hash_undefweak)
1858 {
1859 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1860 eh->dyn_relocs = NULL;
1861
1862 /* Make sure undefined weak symbols are output as a dynamic
1863 symbol in PIEs. */
1864 else if (h->dynindx == -1
1865 && !h->forced_local)
1866 {
1867 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1868 return FALSE;
1869 }
1870 }
1871 }
1872 else if (ELIMINATE_COPY_RELOCS)
1873 {
1874 /* For the non-shared case, discard space for relocs against
1875 symbols which turn out to need copy relocs or are not
1876 dynamic. */
1877
1878 if (!h->non_got_ref
1879 && ((h->def_dynamic
1880 && !h->def_regular)
1881 || (htab->elf.dynamic_sections_created
1882 && (h->root.type == bfd_link_hash_undefweak
1883 || h->root.type == bfd_link_hash_undefined))))
1884 {
1885 /* Make sure this symbol is output as a dynamic symbol.
1886 Undefined weak syms won't yet be marked as dynamic. */
1887 if (h->dynindx == -1
1888 && !h->forced_local)
1889 {
1890 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1891 return FALSE;
1892 }
1893
1894 /* If that succeeded, we know we'll be keeping all the
1895 relocs. */
1896 if (h->dynindx != -1)
1897 goto keep;
1898 }
1899
1900 eh->dyn_relocs = NULL;
1901
1902 keep: ;
1903 }
1904
1905 /* Finally, allocate space. */
1906 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1907 {
1908 asection *sreloc = elf_section_data (p->sec)->sreloc;
1909
1910 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1911 }
1912
1913 return TRUE;
1914 }
1915
1916 /* Find any dynamic relocs that apply to read-only sections. */
1917
1918 static bfd_boolean
1919 readonly_dynrelocs (h, inf)
1920 struct elf_link_hash_entry *h;
1921 PTR inf;
1922 {
1923 struct elf_s390_link_hash_entry *eh;
1924 struct elf_s390_dyn_relocs *p;
1925
1926 if (h->root.type == bfd_link_hash_warning)
1927 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1928
1929 eh = (struct elf_s390_link_hash_entry *) h;
1930 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1931 {
1932 asection *s = p->sec->output_section;
1933
1934 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1935 {
1936 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1937
1938 info->flags |= DF_TEXTREL;
1939
1940 /* Not an error, just cut short the traversal. */
1941 return FALSE;
1942 }
1943 }
1944 return TRUE;
1945 }
1946
1947 /* Set the sizes of the dynamic sections. */
1948
1949 static bfd_boolean
1950 elf_s390_size_dynamic_sections (output_bfd, info)
1951 bfd *output_bfd ATTRIBUTE_UNUSED;
1952 struct bfd_link_info *info;
1953 {
1954 struct elf_s390_link_hash_table *htab;
1955 bfd *dynobj;
1956 asection *s;
1957 bfd_boolean relocs;
1958 bfd *ibfd;
1959
1960 htab = elf_s390_hash_table (info);
1961 dynobj = htab->elf.dynobj;
1962 if (dynobj == NULL)
1963 abort ();
1964
1965 if (htab->elf.dynamic_sections_created)
1966 {
1967 /* Set the contents of the .interp section to the interpreter. */
1968 if (info->executable)
1969 {
1970 s = bfd_get_section_by_name (dynobj, ".interp");
1971 if (s == NULL)
1972 abort ();
1973 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1974 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1975 }
1976 }
1977
1978 /* Set up .got offsets for local syms, and space for local dynamic
1979 relocs. */
1980 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1981 {
1982 bfd_signed_vma *local_got;
1983 bfd_signed_vma *end_local_got;
1984 char *local_tls_type;
1985 bfd_size_type locsymcount;
1986 Elf_Internal_Shdr *symtab_hdr;
1987 asection *srela;
1988
1989 if (! is_s390_elf (ibfd))
1990 continue;
1991
1992 for (s = ibfd->sections; s != NULL; s = s->next)
1993 {
1994 struct elf_s390_dyn_relocs *p;
1995
1996 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
1997 {
1998 if (!bfd_is_abs_section (p->sec)
1999 && bfd_is_abs_section (p->sec->output_section))
2000 {
2001 /* Input section has been discarded, either because
2002 it is a copy of a linkonce section or due to
2003 linker script /DISCARD/, so we'll be discarding
2004 the relocs too. */
2005 }
2006 else if (p->count != 0)
2007 {
2008 srela = elf_section_data (p->sec)->sreloc;
2009 srela->size += p->count * sizeof (Elf32_External_Rela);
2010 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2011 info->flags |= DF_TEXTREL;
2012 }
2013 }
2014 }
2015
2016 local_got = elf_local_got_refcounts (ibfd);
2017 if (!local_got)
2018 continue;
2019
2020 symtab_hdr = &elf_symtab_hdr (ibfd);
2021 locsymcount = symtab_hdr->sh_info;
2022 end_local_got = local_got + locsymcount;
2023 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2024 s = htab->sgot;
2025 srela = htab->srelgot;
2026 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2027 {
2028 if (*local_got > 0)
2029 {
2030 *local_got = s->size;
2031 s->size += GOT_ENTRY_SIZE;
2032 if (*local_tls_type == GOT_TLS_GD)
2033 s->size += GOT_ENTRY_SIZE;
2034 if (info->shared)
2035 srela->size += sizeof (Elf32_External_Rela);
2036 }
2037 else
2038 *local_got = (bfd_vma) -1;
2039 }
2040 }
2041
2042 if (htab->tls_ldm_got.refcount > 0)
2043 {
2044 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32
2045 relocs. */
2046 htab->tls_ldm_got.offset = htab->sgot->size;
2047 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2048 htab->srelgot->size += sizeof (Elf32_External_Rela);
2049 }
2050 else
2051 htab->tls_ldm_got.offset = -1;
2052
2053 /* Allocate global sym .plt and .got entries, and space for global
2054 sym dynamic relocs. */
2055 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2056
2057 /* We now have determined the sizes of the various dynamic sections.
2058 Allocate memory for them. */
2059 relocs = FALSE;
2060 for (s = dynobj->sections; s != NULL; s = s->next)
2061 {
2062 if ((s->flags & SEC_LINKER_CREATED) == 0)
2063 continue;
2064
2065 if (s == htab->splt
2066 || s == htab->sgot
2067 || s == htab->sgotplt
2068 || s == htab->sdynbss)
2069 {
2070 /* Strip this section if we don't need it; see the
2071 comment below. */
2072 }
2073 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2074 {
2075 if (s->size != 0)
2076 relocs = TRUE;
2077
2078 /* We use the reloc_count field as a counter if we need
2079 to copy relocs into the output file. */
2080 s->reloc_count = 0;
2081 }
2082 else
2083 {
2084 /* It's not one of our sections, so don't allocate space. */
2085 continue;
2086 }
2087
2088 if (s->size == 0)
2089 {
2090 /* If we don't need this section, strip it from the
2091 output file. This is to handle .rela.bss and
2092 .rela.plt. We must create it in
2093 create_dynamic_sections, because it must be created
2094 before the linker maps input sections to output
2095 sections. The linker does that before
2096 adjust_dynamic_symbol is called, and it is that
2097 function which decides whether anything needs to go
2098 into these sections. */
2099
2100 s->flags |= SEC_EXCLUDE;
2101 continue;
2102 }
2103
2104 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2105 continue;
2106
2107 /* Allocate memory for the section contents. We use bfd_zalloc
2108 here in case unused entries are not reclaimed before the
2109 section's contents are written out. This should not happen,
2110 but this way if it does, we get a R_390_NONE reloc instead
2111 of garbage. */
2112 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2113 if (s->contents == NULL)
2114 return FALSE;
2115 }
2116
2117 if (htab->elf.dynamic_sections_created)
2118 {
2119 /* Add some entries to the .dynamic section. We fill in the
2120 values later, in elf_s390_finish_dynamic_sections, but we
2121 must add the entries now so that we get the correct size for
2122 the .dynamic section. The DT_DEBUG entry is filled in by the
2123 dynamic linker and used by the debugger. */
2124 #define add_dynamic_entry(TAG, VAL) \
2125 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2126
2127 if (info->executable)
2128 {
2129 if (!add_dynamic_entry (DT_DEBUG, 0))
2130 return FALSE;
2131 }
2132
2133 if (htab->splt->size != 0)
2134 {
2135 if (!add_dynamic_entry (DT_PLTGOT, 0)
2136 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2137 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2138 || !add_dynamic_entry (DT_JMPREL, 0))
2139 return FALSE;
2140 }
2141
2142 if (relocs)
2143 {
2144 if (!add_dynamic_entry (DT_RELA, 0)
2145 || !add_dynamic_entry (DT_RELASZ, 0)
2146 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2147 return FALSE;
2148
2149 /* If any dynamic relocs apply to a read-only section,
2150 then we need a DT_TEXTREL entry. */
2151 if ((info->flags & DF_TEXTREL) == 0)
2152 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2153 (PTR) info);
2154
2155 if ((info->flags & DF_TEXTREL) != 0)
2156 {
2157 if (!add_dynamic_entry (DT_TEXTREL, 0))
2158 return FALSE;
2159 }
2160 }
2161 }
2162 #undef add_dynamic_entry
2163
2164 return TRUE;
2165 }
2166
2167 /* Return the base VMA address which should be subtracted from real addresses
2168 when resolving @dtpoff relocation.
2169 This is PT_TLS segment p_vaddr. */
2170
2171 static bfd_vma
2172 dtpoff_base (info)
2173 struct bfd_link_info *info;
2174 {
2175 /* If tls_sec is NULL, we should have signalled an error already. */
2176 if (elf_hash_table (info)->tls_sec == NULL)
2177 return 0;
2178 return elf_hash_table (info)->tls_sec->vma;
2179 }
2180
2181 /* Return the relocation value for @tpoff relocation
2182 if STT_TLS virtual address is ADDRESS. */
2183
2184 static bfd_vma
2185 tpoff (info, address)
2186 struct bfd_link_info *info;
2187 bfd_vma address;
2188 {
2189 struct elf_link_hash_table *htab = elf_hash_table (info);
2190
2191 /* If tls_sec is NULL, we should have signalled an error already. */
2192 if (htab->tls_sec == NULL)
2193 return 0;
2194 return htab->tls_size + htab->tls_sec->vma - address;
2195 }
2196
2197 /* Complain if TLS instruction relocation is against an invalid
2198 instruction. */
2199
2200 static void
2201 invalid_tls_insn (input_bfd, input_section, rel)
2202 bfd *input_bfd;
2203 asection *input_section;
2204 Elf_Internal_Rela *rel;
2205 {
2206 reloc_howto_type *howto;
2207
2208 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info);
2209 (*_bfd_error_handler)
2210 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2211 input_bfd,
2212 input_section,
2213 (long) rel->r_offset,
2214 howto->name);
2215 bfd_set_error (bfd_error_bad_value);
2216 }
2217
2218 /* Relocate a 390 ELF section. */
2219
2220 static bfd_boolean
2221 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2222 contents, relocs, local_syms, local_sections)
2223 bfd *output_bfd;
2224 struct bfd_link_info *info;
2225 bfd *input_bfd;
2226 asection *input_section;
2227 bfd_byte *contents;
2228 Elf_Internal_Rela *relocs;
2229 Elf_Internal_Sym *local_syms;
2230 asection **local_sections;
2231 {
2232 struct elf_s390_link_hash_table *htab;
2233 Elf_Internal_Shdr *symtab_hdr;
2234 struct elf_link_hash_entry **sym_hashes;
2235 bfd_vma *local_got_offsets;
2236 Elf_Internal_Rela *rel;
2237 Elf_Internal_Rela *relend;
2238
2239 BFD_ASSERT (is_s390_elf (input_bfd));
2240
2241 htab = elf_s390_hash_table (info);
2242 symtab_hdr = &elf_symtab_hdr (input_bfd);
2243 sym_hashes = elf_sym_hashes (input_bfd);
2244 local_got_offsets = elf_local_got_offsets (input_bfd);
2245
2246 rel = relocs;
2247 relend = relocs + input_section->reloc_count;
2248 for (; rel < relend; rel++)
2249 {
2250 unsigned int r_type;
2251 reloc_howto_type *howto;
2252 unsigned long r_symndx;
2253 struct elf_link_hash_entry *h;
2254 Elf_Internal_Sym *sym;
2255 asection *sec;
2256 bfd_vma off;
2257 bfd_vma relocation;
2258 bfd_boolean unresolved_reloc;
2259 bfd_reloc_status_type r;
2260 int tls_type;
2261
2262 r_type = ELF32_R_TYPE (rel->r_info);
2263 if (r_type == (int) R_390_GNU_VTINHERIT
2264 || r_type == (int) R_390_GNU_VTENTRY)
2265 continue;
2266 if (r_type >= (int) R_390_max)
2267 {
2268 bfd_set_error (bfd_error_bad_value);
2269 return FALSE;
2270 }
2271
2272 howto = elf_howto_table + r_type;
2273 r_symndx = ELF32_R_SYM (rel->r_info);
2274
2275 h = NULL;
2276 sym = NULL;
2277 sec = NULL;
2278 unresolved_reloc = FALSE;
2279 if (r_symndx < symtab_hdr->sh_info)
2280 {
2281 sym = local_syms + r_symndx;
2282 sec = local_sections[r_symndx];
2283 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2284 }
2285 else
2286 {
2287 bfd_boolean warned ATTRIBUTE_UNUSED;
2288
2289 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2290 r_symndx, symtab_hdr, sym_hashes,
2291 h, sec, relocation,
2292 unresolved_reloc, warned);
2293 }
2294
2295 if (sec != NULL && elf_discarded_section (sec))
2296 {
2297 /* For relocs against symbols from removed linkonce sections,
2298 or sections discarded by a linker script, we just want the
2299 section contents zeroed. Avoid any special processing. */
2300 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2301 rel->r_info = 0;
2302 rel->r_addend = 0;
2303 continue;
2304 }
2305
2306 if (info->relocatable)
2307 continue;
2308
2309 switch (r_type)
2310 {
2311 case R_390_GOTPLT12:
2312 case R_390_GOTPLT16:
2313 case R_390_GOTPLT20:
2314 case R_390_GOTPLT32:
2315 case R_390_GOTPLTENT:
2316 /* There are three cases for a GOTPLT relocation. 1) The
2317 relocation is against the jump slot entry of a plt that
2318 will get emitted to the output file. 2) The relocation
2319 is against the jump slot of a plt entry that has been
2320 removed. elf_s390_adjust_gotplt has created a GOT entry
2321 as replacement. 3) The relocation is against a local symbol.
2322 Cases 2) and 3) are the same as the GOT relocation code
2323 so we just have to test for case 1 and fall through for
2324 the other two. */
2325 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2326 {
2327 bfd_vma plt_index;
2328
2329 /* Calc. index no.
2330 Current offset - size first entry / entry size. */
2331 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2332 PLT_ENTRY_SIZE;
2333
2334 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2335 addr & GOT addr. */
2336 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2337 unresolved_reloc = FALSE;
2338
2339 if (r_type == R_390_GOTPLTENT)
2340 relocation += htab->sgot->output_section->vma;
2341 break;
2342 }
2343 /* Fall through. */
2344
2345 case R_390_GOT12:
2346 case R_390_GOT16:
2347 case R_390_GOT20:
2348 case R_390_GOT32:
2349 case R_390_GOTENT:
2350 /* Relocation is to the entry for this symbol in the global
2351 offset table. */
2352 if (htab->sgot == NULL)
2353 abort ();
2354
2355 if (h != NULL)
2356 {
2357 bfd_boolean dyn;
2358
2359 off = h->got.offset;
2360 dyn = htab->elf.dynamic_sections_created;
2361 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2362 || (info->shared
2363 && SYMBOL_REFERENCES_LOCAL (info, h))
2364 || (ELF_ST_VISIBILITY (h->other)
2365 && h->root.type == bfd_link_hash_undefweak))
2366 {
2367 /* This is actually a static link, or it is a
2368 -Bsymbolic link and the symbol is defined
2369 locally, or the symbol was forced to be local
2370 because of a version file. We must initialize
2371 this entry in the global offset table. Since the
2372 offset must always be a multiple of 2, we use the
2373 least significant bit to record whether we have
2374 initialized it already.
2375
2376 When doing a dynamic link, we create a .rel.got
2377 relocation entry to initialize the value. This
2378 is done in the finish_dynamic_symbol routine. */
2379 if ((off & 1) != 0)
2380 off &= ~1;
2381 else
2382 {
2383 bfd_put_32 (output_bfd, relocation,
2384 htab->sgot->contents + off);
2385 h->got.offset |= 1;
2386 }
2387 }
2388 else
2389 unresolved_reloc = FALSE;
2390 }
2391 else
2392 {
2393 if (local_got_offsets == NULL)
2394 abort ();
2395
2396 off = local_got_offsets[r_symndx];
2397
2398 /* The offset must always be a multiple of 4. We use
2399 the least significant bit to record whether we have
2400 already generated the necessary reloc. */
2401 if ((off & 1) != 0)
2402 off &= ~1;
2403 else
2404 {
2405 bfd_put_32 (output_bfd, relocation,
2406 htab->sgot->contents + off);
2407
2408 if (info->shared)
2409 {
2410 asection *srelgot;
2411 Elf_Internal_Rela outrel;
2412 bfd_byte *loc;
2413
2414 srelgot = htab->srelgot;
2415 if (srelgot == NULL)
2416 abort ();
2417
2418 outrel.r_offset = (htab->sgot->output_section->vma
2419 + htab->sgot->output_offset
2420 + off);
2421 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2422 outrel.r_addend = relocation;
2423 loc = srelgot->contents;
2424 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
2425 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2426 }
2427
2428 local_got_offsets[r_symndx] |= 1;
2429 }
2430 }
2431
2432 if (off >= (bfd_vma) -2)
2433 abort ();
2434
2435 relocation = htab->sgot->output_offset + off;
2436
2437 /* For @GOTENT the relocation is against the offset between
2438 the instruction and the symbols entry in the GOT and not
2439 between the start of the GOT and the symbols entry. We
2440 add the vma of the GOT to get the correct value. */
2441 if ( r_type == R_390_GOTENT
2442 || r_type == R_390_GOTPLTENT)
2443 relocation += htab->sgot->output_section->vma;
2444
2445 break;
2446
2447 case R_390_GOTOFF16:
2448 case R_390_GOTOFF32:
2449 /* Relocation is relative to the start of the global offset
2450 table. */
2451
2452 /* Note that sgot->output_offset is not involved in this
2453 calculation. We always want the start of .got. If we
2454 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2455 permitted by the ABI, we might have to change this
2456 calculation. */
2457 relocation -= htab->sgot->output_section->vma;
2458 break;
2459
2460 case R_390_GOTPC:
2461 case R_390_GOTPCDBL:
2462 /* Use global offset table as symbol value. */
2463 relocation = htab->sgot->output_section->vma;
2464 unresolved_reloc = FALSE;
2465 break;
2466
2467 case R_390_PLT16DBL:
2468 case R_390_PLT32DBL:
2469 case R_390_PLT32:
2470 /* Relocation is to the entry for this symbol in the
2471 procedure linkage table. */
2472
2473 /* Resolve a PLT32 reloc against a local symbol directly,
2474 without using the procedure linkage table. */
2475 if (h == NULL)
2476 break;
2477
2478 if (h->plt.offset == (bfd_vma) -1
2479 || htab->splt == NULL)
2480 {
2481 /* We didn't make a PLT entry for this symbol. This
2482 happens when statically linking PIC code, or when
2483 using -Bsymbolic. */
2484 break;
2485 }
2486
2487 relocation = (htab->splt->output_section->vma
2488 + htab->splt->output_offset
2489 + h->plt.offset);
2490 unresolved_reloc = FALSE;
2491 break;
2492
2493 case R_390_PLTOFF16:
2494 case R_390_PLTOFF32:
2495 /* Relocation is to the entry for this symbol in the
2496 procedure linkage table relative to the start of the GOT. */
2497
2498 /* For local symbols or if we didn't make a PLT entry for
2499 this symbol resolve the symbol directly. */
2500 if ( h == NULL
2501 || h->plt.offset == (bfd_vma) -1
2502 || htab->splt == NULL)
2503 {
2504 relocation -= htab->sgot->output_section->vma;
2505 break;
2506 }
2507
2508 relocation = (htab->splt->output_section->vma
2509 + htab->splt->output_offset
2510 + h->plt.offset
2511 - htab->sgot->output_section->vma);
2512 unresolved_reloc = FALSE;
2513 break;
2514
2515 case R_390_8:
2516 case R_390_16:
2517 case R_390_32:
2518 case R_390_PC16:
2519 case R_390_PC16DBL:
2520 case R_390_PC32DBL:
2521 case R_390_PC32:
2522 if ((input_section->flags & SEC_ALLOC) == 0)
2523 break;
2524
2525 if ((info->shared
2526 && (h == NULL
2527 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2528 || h->root.type != bfd_link_hash_undefweak)
2529 && ((r_type != R_390_PC16
2530 && r_type != R_390_PC16DBL
2531 && r_type != R_390_PC32DBL
2532 && r_type != R_390_PC32)
2533 || !SYMBOL_CALLS_LOCAL (info, h)))
2534 || (ELIMINATE_COPY_RELOCS
2535 && !info->shared
2536 && h != NULL
2537 && h->dynindx != -1
2538 && !h->non_got_ref
2539 && ((h->def_dynamic
2540 && !h->def_regular)
2541 || h->root.type == bfd_link_hash_undefweak
2542 || h->root.type == bfd_link_hash_undefined)))
2543 {
2544 Elf_Internal_Rela outrel;
2545 bfd_boolean skip, relocate;
2546 asection *sreloc;
2547 bfd_byte *loc;
2548
2549 /* When generating a shared object, these relocations
2550 are copied into the output file to be resolved at run
2551 time. */
2552
2553 skip = FALSE;
2554 relocate = FALSE;
2555
2556 outrel.r_offset =
2557 _bfd_elf_section_offset (output_bfd, info, input_section,
2558 rel->r_offset);
2559 if (outrel.r_offset == (bfd_vma) -1)
2560 skip = TRUE;
2561 else if (outrel.r_offset == (bfd_vma) -2)
2562 skip = TRUE, relocate = TRUE;
2563 outrel.r_offset += (input_section->output_section->vma
2564 + input_section->output_offset);
2565
2566 if (skip)
2567 memset (&outrel, 0, sizeof outrel);
2568 else if (h != NULL
2569 && h->dynindx != -1
2570 && (r_type == R_390_PC16
2571 || r_type == R_390_PC16DBL
2572 || r_type == R_390_PC32DBL
2573 || r_type == R_390_PC32
2574 || !info->shared
2575 || !SYMBOLIC_BIND (info, h)
2576 || !h->def_regular))
2577 {
2578 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2579 outrel.r_addend = rel->r_addend;
2580 }
2581 else
2582 {
2583 /* This symbol is local, or marked to become local. */
2584 outrel.r_addend = relocation + rel->r_addend;
2585 if (r_type == R_390_32)
2586 {
2587 relocate = TRUE;
2588 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2589 }
2590 else
2591 {
2592 long sindx;
2593
2594 if (bfd_is_abs_section (sec))
2595 sindx = 0;
2596 else if (sec == NULL || sec->owner == NULL)
2597 {
2598 bfd_set_error(bfd_error_bad_value);
2599 return FALSE;
2600 }
2601 else
2602 {
2603 asection *osec;
2604
2605 osec = sec->output_section;
2606 sindx = elf_section_data (osec)->dynindx;
2607 if (sindx == 0)
2608 {
2609 osec = htab->elf.text_index_section;
2610 sindx = elf_section_data (osec)->dynindx;
2611 }
2612 BFD_ASSERT (sindx != 0);
2613
2614 /* We are turning this relocation into one
2615 against a section symbol, so subtract out
2616 the output section's address but not the
2617 offset of the input section in the output
2618 section. */
2619 outrel.r_addend -= osec->vma;
2620 }
2621 outrel.r_info = ELF32_R_INFO (sindx, r_type);
2622 }
2623 }
2624
2625 sreloc = elf_section_data (input_section)->sreloc;
2626 if (sreloc == NULL)
2627 abort ();
2628
2629 loc = sreloc->contents;
2630 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2631 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2632
2633 /* If this reloc is against an external symbol, we do
2634 not want to fiddle with the addend. Otherwise, we
2635 need to include the symbol value so that it becomes
2636 an addend for the dynamic reloc. */
2637 if (! relocate)
2638 continue;
2639 }
2640 break;
2641
2642 /* Relocations for tls literal pool entries. */
2643 case R_390_TLS_IE32:
2644 if (info->shared)
2645 {
2646 Elf_Internal_Rela outrel;
2647 asection *sreloc;
2648 bfd_byte *loc;
2649
2650 outrel.r_offset = rel->r_offset
2651 + input_section->output_section->vma
2652 + input_section->output_offset;
2653 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2654 sreloc = elf_section_data (input_section)->sreloc;
2655 if (sreloc == NULL)
2656 abort ();
2657 loc = sreloc->contents;
2658 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2659 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2660 }
2661 /* Fall through. */
2662
2663 case R_390_TLS_GD32:
2664 case R_390_TLS_GOTIE32:
2665 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2666 tls_type = GOT_UNKNOWN;
2667 if (h == NULL && local_got_offsets)
2668 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2669 else if (h != NULL)
2670 {
2671 tls_type = elf_s390_hash_entry(h)->tls_type;
2672 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2673 r_type = R_390_TLS_LE32;
2674 }
2675 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE)
2676 r_type = R_390_TLS_IE32;
2677
2678 if (r_type == R_390_TLS_LE32)
2679 {
2680 /* This relocation gets optimized away by the local exec
2681 access optimization. */
2682 BFD_ASSERT (! unresolved_reloc);
2683 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2684 contents + rel->r_offset);
2685 continue;
2686 }
2687
2688 if (htab->sgot == NULL)
2689 abort ();
2690
2691 if (h != NULL)
2692 off = h->got.offset;
2693 else
2694 {
2695 if (local_got_offsets == NULL)
2696 abort ();
2697
2698 off = local_got_offsets[r_symndx];
2699 }
2700
2701 emit_tls_relocs:
2702
2703 if ((off & 1) != 0)
2704 off &= ~1;
2705 else
2706 {
2707 Elf_Internal_Rela outrel;
2708 bfd_byte *loc;
2709 int dr_type, indx;
2710
2711 if (htab->srelgot == NULL)
2712 abort ();
2713
2714 outrel.r_offset = (htab->sgot->output_section->vma
2715 + htab->sgot->output_offset + off);
2716
2717 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2718 if (r_type == R_390_TLS_GD32)
2719 dr_type = R_390_TLS_DTPMOD;
2720 else
2721 dr_type = R_390_TLS_TPOFF;
2722 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2723 outrel.r_addend = relocation - dtpoff_base (info);
2724 else
2725 outrel.r_addend = 0;
2726 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2727 loc = htab->srelgot->contents;
2728 loc += htab->srelgot->reloc_count++
2729 * sizeof (Elf32_External_Rela);
2730 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2731
2732 if (r_type == R_390_TLS_GD32)
2733 {
2734 if (indx == 0)
2735 {
2736 BFD_ASSERT (! unresolved_reloc);
2737 bfd_put_32 (output_bfd,
2738 relocation - dtpoff_base (info),
2739 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2740 }
2741 else
2742 {
2743 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF);
2744 outrel.r_offset += GOT_ENTRY_SIZE;
2745 outrel.r_addend = 0;
2746 htab->srelgot->reloc_count++;
2747 loc += sizeof (Elf32_External_Rela);
2748 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2749 }
2750 }
2751
2752 if (h != NULL)
2753 h->got.offset |= 1;
2754 else
2755 local_got_offsets[r_symndx] |= 1;
2756 }
2757
2758 if (off >= (bfd_vma) -2)
2759 abort ();
2760 if (r_type == ELF32_R_TYPE (rel->r_info))
2761 {
2762 relocation = htab->sgot->output_offset + off;
2763 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT)
2764 relocation += htab->sgot->output_section->vma;
2765 unresolved_reloc = FALSE;
2766 }
2767 else
2768 {
2769 bfd_put_32 (output_bfd, htab->sgot->output_offset + off,
2770 contents + rel->r_offset);
2771 continue;
2772 }
2773 break;
2774
2775 case R_390_TLS_GOTIE12:
2776 case R_390_TLS_GOTIE20:
2777 case R_390_TLS_IEENT:
2778 if (h == NULL)
2779 {
2780 if (local_got_offsets == NULL)
2781 abort();
2782 off = local_got_offsets[r_symndx];
2783 if (info->shared)
2784 goto emit_tls_relocs;
2785 }
2786 else
2787 {
2788 off = h->got.offset;
2789 tls_type = elf_s390_hash_entry(h)->tls_type;
2790 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2791 goto emit_tls_relocs;
2792 }
2793
2794 if (htab->sgot == NULL)
2795 abort ();
2796
2797 BFD_ASSERT (! unresolved_reloc);
2798 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2799 htab->sgot->contents + off);
2800 relocation = htab->sgot->output_offset + off;
2801 if (r_type == R_390_TLS_IEENT)
2802 relocation += htab->sgot->output_section->vma;
2803 unresolved_reloc = FALSE;
2804 break;
2805
2806 case R_390_TLS_LDM32:
2807 if (! info->shared)
2808 /* The literal pool entry this relocation refers to gets ignored
2809 by the optimized code of the local exec model. Do nothing
2810 and the value will turn out zero. */
2811 continue;
2812
2813 if (htab->sgot == NULL)
2814 abort ();
2815
2816 off = htab->tls_ldm_got.offset;
2817 if (off & 1)
2818 off &= ~1;
2819 else
2820 {
2821 Elf_Internal_Rela outrel;
2822 bfd_byte *loc;
2823
2824 if (htab->srelgot == NULL)
2825 abort ();
2826
2827 outrel.r_offset = (htab->sgot->output_section->vma
2828 + htab->sgot->output_offset + off);
2829
2830 bfd_put_32 (output_bfd, 0,
2831 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2832 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD);
2833 outrel.r_addend = 0;
2834 loc = htab->srelgot->contents;
2835 loc += htab->srelgot->reloc_count++
2836 * sizeof (Elf32_External_Rela);
2837 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2838 htab->tls_ldm_got.offset |= 1;
2839 }
2840 relocation = htab->sgot->output_offset + off;
2841 unresolved_reloc = FALSE;
2842 break;
2843
2844 case R_390_TLS_LE32:
2845 if (info->shared)
2846 {
2847 /* Linking a shared library with non-fpic code requires
2848 a R_390_TLS_TPOFF relocation. */
2849 Elf_Internal_Rela outrel;
2850 asection *sreloc;
2851 bfd_byte *loc;
2852 int indx;
2853
2854 outrel.r_offset = rel->r_offset
2855 + input_section->output_section->vma
2856 + input_section->output_offset;
2857 if (h != NULL && h->dynindx != -1)
2858 indx = h->dynindx;
2859 else
2860 indx = 0;
2861 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF);
2862 if (indx == 0)
2863 outrel.r_addend = relocation - dtpoff_base (info);
2864 else
2865 outrel.r_addend = 0;
2866 sreloc = elf_section_data (input_section)->sreloc;
2867 if (sreloc == NULL)
2868 abort ();
2869 loc = sreloc->contents;
2870 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2871 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2872 }
2873 else
2874 {
2875 BFD_ASSERT (! unresolved_reloc);
2876 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2877 contents + rel->r_offset);
2878 }
2879 continue;
2880
2881 case R_390_TLS_LDO32:
2882 if (info->shared)
2883 relocation -= dtpoff_base (info);
2884 else
2885 /* When converting LDO to LE, we must negate. */
2886 relocation = -tpoff (info, relocation);
2887 break;
2888
2889 /* Relocations for tls instructions. */
2890 case R_390_TLS_LOAD:
2891 case R_390_TLS_GDCALL:
2892 case R_390_TLS_LDCALL:
2893 tls_type = GOT_UNKNOWN;
2894 if (h == NULL && local_got_offsets)
2895 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2896 else if (h != NULL)
2897 tls_type = elf_s390_hash_entry(h)->tls_type;
2898
2899 if (tls_type == GOT_TLS_GD)
2900 continue;
2901
2902 if (r_type == R_390_TLS_LOAD)
2903 {
2904 if (!info->shared && (h == NULL || h->dynindx == -1))
2905 {
2906 /* IE->LE transition. Four valid cases:
2907 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0
2908 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0
2909 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0
2910 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2911 unsigned int insn, ry;
2912
2913 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2914 ry = 0;
2915 if ((insn & 0xff00f000) == 0x58000000)
2916 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */
2917 ry = (insn & 0x000f0000);
2918 else if ((insn & 0xff0f0000) == 0x58000000)
2919 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */
2920 ry = (insn & 0x0000f000) << 4;
2921 else if ((insn & 0xff00f000) == 0x5800c000)
2922 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */
2923 ry = (insn & 0x000f0000);
2924 else if ((insn & 0xff0f0000) == 0x580c0000)
2925 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2926 ry = (insn & 0x0000f000) << 4;
2927 else
2928 invalid_tls_insn (input_bfd, input_section, rel);
2929 insn = 0x18000700 | (insn & 0x00f00000) | ry;
2930 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2931 }
2932 }
2933 else if (r_type == R_390_TLS_GDCALL)
2934 {
2935 unsigned int insn;
2936
2937 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2938 if ((insn & 0xff000fff) != 0x4d000000 &&
2939 (insn & 0xffff0000) != 0xc0e50000)
2940 invalid_tls_insn (input_bfd, input_section, rel);
2941 if (!info->shared && (h == NULL || h->dynindx == -1))
2942 {
2943 if ((insn & 0xff000000) == 0x4d000000)
2944 {
2945 /* GD->LE transition.
2946 bas %r14,0(%rx,%r13) -> bc 0,0 */
2947 insn = 0x47000000;
2948 }
2949 else
2950 {
2951 /* GD->LE transition.
2952 brasl %r14,_tls_get_addr@plt -> brcl 0,. */
2953 insn = 0xc0040000;
2954 bfd_put_16 (output_bfd, 0x0000,
2955 contents + rel->r_offset + 4);
2956 }
2957 }
2958 else
2959 {
2960 if ((insn & 0xff000000) == 0x4d000000)
2961 {
2962 /* GD->IE transition.
2963 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */
2964 insn = 0x5822c000;
2965 }
2966 else
2967 {
2968 /* GD->IE transition.
2969 brasl %r14,__tls_get_addr@plt ->
2970 l %r2,0(%r2,%r12) ; bcr 0,0 */
2971 insn = 0x5822c000;
2972 bfd_put_16 (output_bfd, 0x0700,
2973 contents + rel->r_offset + 4);
2974 }
2975 }
2976 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2977 }
2978 else if (r_type == R_390_TLS_LDCALL)
2979 {
2980 if (!info->shared)
2981 {
2982 unsigned int insn;
2983
2984 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2985 if ((insn & 0xff000fff) != 0x4d000000 &&
2986 (insn & 0xffff0000) != 0xc0e50000)
2987 invalid_tls_insn (input_bfd, input_section, rel);
2988 if ((insn & 0xff000000) == 0x4d000000)
2989 {
2990 /* LD->LE transition.
2991 bas %r14,0(%rx,%r13) -> bc 0,0 */
2992 insn = 0x47000000;
2993 }
2994 else
2995 {
2996 /* LD->LE transition.
2997 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2998 insn = 0xc0040000;
2999 bfd_put_16 (output_bfd, 0x0000,
3000 contents + rel->r_offset + 4);
3001 }
3002 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3003 }
3004 }
3005 continue;
3006
3007 default:
3008 break;
3009 }
3010
3011 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3012 because such sections are not SEC_ALLOC and thus ld.so will
3013 not process them. */
3014 if (unresolved_reloc
3015 && !((input_section->flags & SEC_DEBUGGING) != 0
3016 && h->def_dynamic))
3017 (*_bfd_error_handler)
3018 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3019 input_bfd,
3020 input_section,
3021 (long) rel->r_offset,
3022 howto->name,
3023 h->root.root.string);
3024
3025 if (r_type == R_390_20
3026 || r_type == R_390_GOT20
3027 || r_type == R_390_GOTPLT20
3028 || r_type == R_390_TLS_GOTIE20)
3029 {
3030 relocation += rel->r_addend;
3031 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3032 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3033 contents, rel->r_offset,
3034 relocation, 0);
3035 }
3036 else
3037 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3038 contents, rel->r_offset,
3039 relocation, rel->r_addend);
3040
3041 if (r != bfd_reloc_ok)
3042 {
3043 const char *name;
3044
3045 if (h != NULL)
3046 name = h->root.root.string;
3047 else
3048 {
3049 name = bfd_elf_string_from_elf_section (input_bfd,
3050 symtab_hdr->sh_link,
3051 sym->st_name);
3052 if (name == NULL)
3053 return FALSE;
3054 if (*name == '\0')
3055 name = bfd_section_name (input_bfd, sec);
3056 }
3057
3058 if (r == bfd_reloc_overflow)
3059 {
3060
3061 if (! ((*info->callbacks->reloc_overflow)
3062 (info, (h ? &h->root : NULL), name, howto->name,
3063 (bfd_vma) 0, input_bfd, input_section,
3064 rel->r_offset)))
3065 return FALSE;
3066 }
3067 else
3068 {
3069 (*_bfd_error_handler)
3070 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3071 input_bfd, input_section,
3072 (long) rel->r_offset, name, (int) r);
3073 return FALSE;
3074 }
3075 }
3076 }
3077
3078 return TRUE;
3079 }
3080
3081 /* Finish up dynamic symbol handling. We set the contents of various
3082 dynamic sections here. */
3083
3084 static bfd_boolean
3085 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3086 bfd *output_bfd;
3087 struct bfd_link_info *info;
3088 struct elf_link_hash_entry *h;
3089 Elf_Internal_Sym *sym;
3090 {
3091 struct elf_s390_link_hash_table *htab;
3092
3093 htab = elf_s390_hash_table (info);
3094
3095 if (h->plt.offset != (bfd_vma) -1)
3096 {
3097 bfd_vma plt_index;
3098 bfd_vma got_offset;
3099 Elf_Internal_Rela rela;
3100 bfd_byte *loc;
3101 bfd_vma relative_offset;
3102
3103 /* This symbol has an entry in the procedure linkage table. Set
3104 it up. */
3105 if (h->dynindx == -1
3106 || htab->splt == NULL
3107 || htab->sgotplt == NULL
3108 || htab->srelplt == NULL)
3109 abort ();
3110
3111 /* Calc. index no.
3112 Current offset - size first entry / entry size. */
3113 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3114
3115 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
3116 addr & GOT addr. */
3117 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3118
3119 /* S390 uses halfwords for relative branch calc! */
3120 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
3121 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
3122 /* If offset is > 32768, branch to a previous branch
3123 390 can only handle +-64 K jumps. */
3124 if ( -32768 > (int) relative_offset )
3125 relative_offset
3126 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3127
3128 /* Fill in the entry in the procedure linkage table. */
3129 if (!info->shared)
3130 {
3131 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3132 htab->splt->contents + h->plt.offset);
3133 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3134 htab->splt->contents + h->plt.offset + 4);
3135 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3136 htab->splt->contents + h->plt.offset + 8);
3137 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3138 htab->splt->contents + h->plt.offset + 12);
3139 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3140 htab->splt->contents + h->plt.offset + 16);
3141 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3142 htab->splt->contents + h->plt.offset + 20);
3143 bfd_put_32 (output_bfd,
3144 (htab->sgotplt->output_section->vma
3145 + htab->sgotplt->output_offset
3146 + got_offset),
3147 htab->splt->contents + h->plt.offset + 24);
3148 }
3149 else if (got_offset < 4096)
3150 {
3151 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD0 + got_offset,
3152 htab->splt->contents + h->plt.offset);
3153 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD1,
3154 htab->splt->contents + h->plt.offset + 4);
3155 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD2,
3156 htab->splt->contents + h->plt.offset + 8);
3157 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD3,
3158 htab->splt->contents + h->plt.offset + 12);
3159 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD4,
3160 htab->splt->contents + h->plt.offset + 16);
3161 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3162 htab->splt->contents + h->plt.offset + 20);
3163 bfd_put_32 (output_bfd, (bfd_vma) 0,
3164 htab->splt->contents + h->plt.offset + 24);
3165 }
3166 else if (got_offset < 32768)
3167 {
3168 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD0 + got_offset,
3169 htab->splt->contents + h->plt.offset);
3170 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD1,
3171 htab->splt->contents + h->plt.offset + 4);
3172 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD2,
3173 htab->splt->contents + h->plt.offset + 8);
3174 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD3,
3175 htab->splt->contents + h->plt.offset + 12);
3176 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD4,
3177 htab->splt->contents + h->plt.offset + 16);
3178 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3179 htab->splt->contents + h->plt.offset + 20);
3180 bfd_put_32 (output_bfd, (bfd_vma) 0,
3181 htab->splt->contents + h->plt.offset + 24);
3182 }
3183 else
3184 {
3185 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD0,
3186 htab->splt->contents + h->plt.offset);
3187 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD1,
3188 htab->splt->contents + h->plt.offset + 4);
3189 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD2,
3190 htab->splt->contents + h->plt.offset + 8);
3191 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD3,
3192 htab->splt->contents + h->plt.offset + 12);
3193 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD4,
3194 htab->splt->contents + h->plt.offset + 16);
3195 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3196 htab->splt->contents + h->plt.offset + 20);
3197 bfd_put_32 (output_bfd, got_offset,
3198 htab->splt->contents + h->plt.offset + 24);
3199 }
3200 /* Insert offset into reloc. table here. */
3201 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
3202 htab->splt->contents + h->plt.offset + 28);
3203
3204 /* Fill in the entry in the global offset table.
3205 Points to instruction after GOT offset. */
3206 bfd_put_32 (output_bfd,
3207 (htab->splt->output_section->vma
3208 + htab->splt->output_offset
3209 + h->plt.offset
3210 + 12),
3211 htab->sgotplt->contents + got_offset);
3212
3213 /* Fill in the entry in the .rela.plt section. */
3214 rela.r_offset = (htab->sgotplt->output_section->vma
3215 + htab->sgotplt->output_offset
3216 + got_offset);
3217 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3218 rela.r_addend = 0;
3219 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rela);
3220 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3221
3222 if (!h->def_regular)
3223 {
3224 /* Mark the symbol as undefined, rather than as defined in
3225 the .plt section. Leave the value alone. This is a clue
3226 for the dynamic linker, to make function pointer
3227 comparisons work between an application and shared
3228 library. */
3229 sym->st_shndx = SHN_UNDEF;
3230 }
3231 }
3232
3233 if (h->got.offset != (bfd_vma) -1
3234 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3235 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3236 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3237 {
3238 Elf_Internal_Rela rela;
3239 bfd_byte *loc;
3240
3241 /* This symbol has an entry in the global offset table. Set it
3242 up. */
3243
3244 if (htab->sgot == NULL || htab->srelgot == NULL)
3245 abort ();
3246
3247 rela.r_offset = (htab->sgot->output_section->vma
3248 + htab->sgot->output_offset
3249 + (h->got.offset &~ (bfd_vma) 1));
3250
3251 /* If this is a static link, or it is a -Bsymbolic link and the
3252 symbol is defined locally or was forced to be local because
3253 of a version file, we just want to emit a RELATIVE reloc.
3254 The entry in the global offset table will already have been
3255 initialized in the relocate_section function. */
3256 if (info->shared
3257 && SYMBOL_REFERENCES_LOCAL (info, h))
3258 {
3259 if (!h->def_regular)
3260 return FALSE;
3261 BFD_ASSERT((h->got.offset & 1) != 0);
3262 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
3263 rela.r_addend = (h->root.u.def.value
3264 + h->root.u.def.section->output_section->vma
3265 + h->root.u.def.section->output_offset);
3266 }
3267 else
3268 {
3269 BFD_ASSERT((h->got.offset & 1) == 0);
3270 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3271 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
3272 rela.r_addend = 0;
3273 }
3274
3275 loc = htab->srelgot->contents;
3276 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3277 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3278 }
3279
3280 if (h->needs_copy)
3281 {
3282 Elf_Internal_Rela rela;
3283 bfd_byte *loc;
3284
3285 /* This symbols needs a copy reloc. Set it up. */
3286
3287 if (h->dynindx == -1
3288 || (h->root.type != bfd_link_hash_defined
3289 && h->root.type != bfd_link_hash_defweak)
3290 || htab->srelbss == NULL)
3291 abort ();
3292
3293 rela.r_offset = (h->root.u.def.value
3294 + h->root.u.def.section->output_section->vma
3295 + h->root.u.def.section->output_offset);
3296 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
3297 rela.r_addend = 0;
3298 loc = htab->srelbss->contents;
3299 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rela);
3300 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3301 }
3302
3303 /* Mark some specially defined symbols as absolute. */
3304 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3305 || h == htab->elf.hgot
3306 || h == htab->elf.hplt)
3307 sym->st_shndx = SHN_ABS;
3308
3309 return TRUE;
3310 }
3311
3312 /* Used to decide how to sort relocs in an optimal manner for the
3313 dynamic linker, before writing them out. */
3314
3315 static enum elf_reloc_type_class
3316 elf_s390_reloc_type_class (rela)
3317 const Elf_Internal_Rela *rela;
3318 {
3319 switch ((int) ELF32_R_TYPE (rela->r_info))
3320 {
3321 case R_390_RELATIVE:
3322 return reloc_class_relative;
3323 case R_390_JMP_SLOT:
3324 return reloc_class_plt;
3325 case R_390_COPY:
3326 return reloc_class_copy;
3327 default:
3328 return reloc_class_normal;
3329 }
3330 }
3331
3332 /* Finish up the dynamic sections. */
3333
3334 static bfd_boolean
3335 elf_s390_finish_dynamic_sections (output_bfd, info)
3336 bfd *output_bfd;
3337 struct bfd_link_info *info;
3338 {
3339 struct elf_s390_link_hash_table *htab;
3340 bfd *dynobj;
3341 asection *sdyn;
3342
3343 htab = elf_s390_hash_table (info);
3344 dynobj = htab->elf.dynobj;
3345 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3346
3347 if (htab->elf.dynamic_sections_created)
3348 {
3349 Elf32_External_Dyn *dyncon, *dynconend;
3350
3351 if (sdyn == NULL || htab->sgot == NULL)
3352 abort ();
3353
3354 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3355 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3356 for (; dyncon < dynconend; dyncon++)
3357 {
3358 Elf_Internal_Dyn dyn;
3359 asection *s;
3360
3361 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3362
3363 switch (dyn.d_tag)
3364 {
3365 default:
3366 continue;
3367
3368 case DT_PLTGOT:
3369 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3370 break;
3371
3372 case DT_JMPREL:
3373 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3374 break;
3375
3376 case DT_PLTRELSZ:
3377 s = htab->srelplt->output_section;
3378 dyn.d_un.d_val = s->size;
3379 break;
3380 }
3381
3382 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3383 }
3384
3385 /* Fill in the special first entry in the procedure linkage table. */
3386 if (htab->splt && htab->splt->size > 0)
3387 {
3388 memset (htab->splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
3389 if (info->shared)
3390 {
3391 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD0,
3392 htab->splt->contents );
3393 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD1,
3394 htab->splt->contents +4 );
3395 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD2,
3396 htab->splt->contents +8 );
3397 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD3,
3398 htab->splt->contents +12 );
3399 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD4,
3400 htab->splt->contents +16 );
3401 }
3402 else
3403 {
3404 bfd_put_32 (output_bfd, (bfd_vma)PLT_FIRST_ENTRY_WORD0,
3405 htab->splt->contents );
3406 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3407 htab->splt->contents +4 );
3408 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD2,
3409 htab->splt->contents +8 );
3410 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3411 htab->splt->contents +12 );
3412 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3413 htab->splt->contents +16 );
3414 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3415 htab->splt->contents +20 );
3416 bfd_put_32 (output_bfd,
3417 htab->sgotplt->output_section->vma
3418 + htab->sgotplt->output_offset,
3419 htab->splt->contents + 24);
3420 }
3421 elf_section_data (htab->splt->output_section)
3422 ->this_hdr.sh_entsize = 4;
3423 }
3424
3425 }
3426
3427 if (htab->sgotplt)
3428 {
3429 /* Fill in the first three entries in the global offset table. */
3430 if (htab->sgotplt->size > 0)
3431 {
3432 bfd_put_32 (output_bfd,
3433 (sdyn == NULL ? (bfd_vma) 0
3434 : sdyn->output_section->vma + sdyn->output_offset),
3435 htab->sgotplt->contents);
3436 /* One entry for shared object struct ptr. */
3437 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4);
3438 /* One entry for _dl_runtime_resolve. */
3439 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3440 }
3441
3442 elf_section_data (htab->sgotplt->output_section)
3443 ->this_hdr.sh_entsize = 4;
3444 }
3445 return TRUE;
3446 }
3447
3448 static bfd_boolean
3449 elf_s390_grok_prstatus (abfd, note)
3450 bfd * abfd;
3451 Elf_Internal_Note * note;
3452 {
3453 int offset;
3454 unsigned int size;
3455
3456 switch (note->descsz)
3457 {
3458 default:
3459 return FALSE;
3460
3461 case 224: /* S/390 Linux. */
3462 /* pr_cursig */
3463 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3464
3465 /* pr_pid */
3466 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
3467
3468 /* pr_reg */
3469 offset = 72;
3470 size = 144;
3471 break;
3472 }
3473
3474 /* Make a ".reg/999" section. */
3475 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3476 size, note->descpos + offset);
3477 }
3478
3479 /* Return address for Ith PLT stub in section PLT, for relocation REL
3480 or (bfd_vma) -1 if it should not be included. */
3481
3482 static bfd_vma
3483 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3484 const arelent *rel ATTRIBUTE_UNUSED)
3485 {
3486 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3487 }
3488
3489
3490 #define TARGET_BIG_SYM bfd_elf32_s390_vec
3491 #define TARGET_BIG_NAME "elf32-s390"
3492 #define ELF_ARCH bfd_arch_s390
3493 #define ELF_MACHINE_CODE EM_S390
3494 #define ELF_MACHINE_ALT1 EM_S390_OLD
3495 #define ELF_MAXPAGESIZE 0x1000
3496
3497 #define elf_backend_can_gc_sections 1
3498 #define elf_backend_can_refcount 1
3499 #define elf_backend_want_got_plt 1
3500 #define elf_backend_plt_readonly 1
3501 #define elf_backend_want_plt_sym 0
3502 #define elf_backend_got_header_size 12
3503 #define elf_backend_rela_normal 1
3504
3505 #define elf_info_to_howto elf_s390_info_to_howto
3506
3507 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
3508 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
3509 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3510 #define bfd_elf32_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
3511
3512 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3513 #define elf_backend_check_relocs elf_s390_check_relocs
3514 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3515 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3516 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3517 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3518 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3519 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3520 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3521 #define elf_backend_relocate_section elf_s390_relocate_section
3522 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3523 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3524 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3525 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
3526 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3527
3528 #define bfd_elf32_mkobject elf_s390_mkobject
3529 #define elf_backend_object_p elf_s390_object_p
3530
3531 #include "elf32-target.h"
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