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[binutils.git] / bfd / elf32-s390.c
blob46e9541f07ff0101ed0174c80dfd2d1c3adcb541
1 /* IBM S/390-specific support for 32-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
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_DATA)
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_DATA);
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 cache. */
734 struct sym_cache sym_cache;
735 };
736
737 /* Get the s390 ELF linker hash table from a link_info structure. */
738
739 #define elf_s390_hash_table(p) \
740 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
741 == S390_ELF_DATA ? ((struct elf_s390_link_hash_table *) ((p)->hash)) : NULL)
742
743 /* Create an entry in an s390 ELF linker hash table. */
744
745 static struct bfd_hash_entry *
746 link_hash_newfunc (entry, table, string)
747 struct bfd_hash_entry *entry;
748 struct bfd_hash_table *table;
749 const char *string;
750 {
751 /* Allocate the structure if it has not already been allocated by a
752 subclass. */
753 if (entry == NULL)
754 {
755 entry = bfd_hash_allocate (table,
756 sizeof (struct elf_s390_link_hash_entry));
757 if (entry == NULL)
758 return entry;
759 }
760
761 /* Call the allocation method of the superclass. */
762 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
763 if (entry != NULL)
764 {
765 struct elf_s390_link_hash_entry *eh;
766
767 eh = (struct elf_s390_link_hash_entry *) entry;
768 eh->dyn_relocs = NULL;
769 eh->gotplt_refcount = 0;
770 eh->tls_type = GOT_UNKNOWN;
771 }
772
773 return entry;
774 }
775
776 /* Create an s390 ELF linker hash table. */
777
778 static struct bfd_link_hash_table *
779 elf_s390_link_hash_table_create (abfd)
780 bfd *abfd;
781 {
782 struct elf_s390_link_hash_table *ret;
783 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
784
785 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
786 if (ret == NULL)
787 return NULL;
788
789 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
790 sizeof (struct elf_s390_link_hash_entry),
791 S390_ELF_DATA))
792 {
793 free (ret);
794 return NULL;
795 }
796
797 ret->sgot = NULL;
798 ret->sgotplt = NULL;
799 ret->srelgot = NULL;
800 ret->splt = NULL;
801 ret->srelplt = NULL;
802 ret->sdynbss = NULL;
803 ret->srelbss = NULL;
804 ret->tls_ldm_got.refcount = 0;
805 ret->sym_cache.abfd = NULL;
806
807 return &ret->elf.root;
808 }
809
810 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
811 shortcuts to them in our hash table. */
812
813 static bfd_boolean
814 create_got_section (dynobj, info)
815 bfd *dynobj;
816 struct bfd_link_info *info;
817 {
818 struct elf_s390_link_hash_table *htab;
819
820 if (! _bfd_elf_create_got_section (dynobj, info))
821 return FALSE;
822
823 htab = elf_s390_hash_table (info);
824 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
825 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
826 htab->srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
827 if (!htab->sgot || !htab->sgotplt || !htab->srelgot)
828 abort ();
829
830 return TRUE;
831 }
832
833 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
834 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
835 hash table. */
836
837 static bfd_boolean
838 elf_s390_create_dynamic_sections (dynobj, info)
839 bfd *dynobj;
840 struct bfd_link_info *info;
841 {
842 struct elf_s390_link_hash_table *htab;
843
844 htab = elf_s390_hash_table (info);
845 if (!htab->sgot && !create_got_section (dynobj, info))
846 return FALSE;
847
848 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
849 return FALSE;
850
851 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
852 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
853 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
854 if (!info->shared)
855 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
856
857 if (!htab->splt || !htab->srelplt || !htab->sdynbss
858 || (!info->shared && !htab->srelbss))
859 abort ();
860
861 return TRUE;
862 }
863
864 /* Copy the extra info we tack onto an elf_link_hash_entry. */
865
866 static void
867 elf_s390_copy_indirect_symbol (info, dir, ind)
868 struct bfd_link_info *info;
869 struct elf_link_hash_entry *dir, *ind;
870 {
871 struct elf_s390_link_hash_entry *edir, *eind;
872
873 edir = (struct elf_s390_link_hash_entry *) dir;
874 eind = (struct elf_s390_link_hash_entry *) ind;
875
876 if (eind->dyn_relocs != NULL)
877 {
878 if (edir->dyn_relocs != NULL)
879 {
880 struct elf_s390_dyn_relocs **pp;
881 struct elf_s390_dyn_relocs *p;
882
883 /* Add reloc counts against the indirect sym to the direct sym
884 list. Merge any entries against the same section. */
885 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
886 {
887 struct elf_s390_dyn_relocs *q;
888
889 for (q = edir->dyn_relocs; q != NULL; q = q->next)
890 if (q->sec == p->sec)
891 {
892 q->pc_count += p->pc_count;
893 q->count += p->count;
894 *pp = p->next;
895 break;
896 }
897 if (q == NULL)
898 pp = &p->next;
899 }
900 *pp = edir->dyn_relocs;
901 }
902
903 edir->dyn_relocs = eind->dyn_relocs;
904 eind->dyn_relocs = NULL;
905 }
906
907 if (ind->root.type == bfd_link_hash_indirect
908 && dir->got.refcount <= 0)
909 {
910 edir->tls_type = eind->tls_type;
911 eind->tls_type = GOT_UNKNOWN;
912 }
913
914 if (ELIMINATE_COPY_RELOCS
915 && ind->root.type != bfd_link_hash_indirect
916 && dir->dynamic_adjusted)
917 {
918 /* If called to transfer flags for a weakdef during processing
919 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
920 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
921 dir->ref_dynamic |= ind->ref_dynamic;
922 dir->ref_regular |= ind->ref_regular;
923 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
924 dir->needs_plt |= ind->needs_plt;
925 }
926 else
927 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
928 }
929
930 static int
931 elf_s390_tls_transition (info, r_type, is_local)
932 struct bfd_link_info *info;
933 int r_type;
934 int is_local;
935 {
936 if (info->shared)
937 return r_type;
938
939 switch (r_type)
940 {
941 case R_390_TLS_GD32:
942 case R_390_TLS_IE32:
943 if (is_local)
944 return R_390_TLS_LE32;
945 return R_390_TLS_IE32;
946 case R_390_TLS_GOTIE32:
947 if (is_local)
948 return R_390_TLS_LE32;
949 return R_390_TLS_GOTIE32;
950 case R_390_TLS_LDM32:
951 return R_390_TLS_LE32;
952 }
953
954 return r_type;
955 }
956
957 /* Look through the relocs for a section during the first phase, and
958 allocate space in the global offset table or procedure linkage
959 table. */
960
961 static bfd_boolean
962 elf_s390_check_relocs (abfd, info, sec, relocs)
963 bfd *abfd;
964 struct bfd_link_info *info;
965 asection *sec;
966 const Elf_Internal_Rela *relocs;
967 {
968 struct elf_s390_link_hash_table *htab;
969 Elf_Internal_Shdr *symtab_hdr;
970 struct elf_link_hash_entry **sym_hashes;
971 const Elf_Internal_Rela *rel;
972 const Elf_Internal_Rela *rel_end;
973 asection *sreloc;
974 bfd_signed_vma *local_got_refcounts;
975 int tls_type, old_tls_type;
976
977 if (info->relocatable)
978 return TRUE;
979
980 BFD_ASSERT (is_s390_elf (abfd));
981
982 htab = elf_s390_hash_table (info);
983 symtab_hdr = &elf_symtab_hdr (abfd);
984 sym_hashes = elf_sym_hashes (abfd);
985 local_got_refcounts = elf_local_got_refcounts (abfd);
986
987 sreloc = NULL;
988
989 rel_end = relocs + sec->reloc_count;
990 for (rel = relocs; rel < rel_end; rel++)
991 {
992 unsigned int r_type;
993 unsigned long r_symndx;
994 struct elf_link_hash_entry *h;
995
996 r_symndx = ELF32_R_SYM (rel->r_info);
997
998 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
999 {
1000 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1001 abfd, r_symndx);
1002 return FALSE;
1003 }
1004
1005 if (r_symndx < symtab_hdr->sh_info)
1006 h = NULL;
1007 else
1008 {
1009 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1010 while (h->root.type == bfd_link_hash_indirect
1011 || h->root.type == bfd_link_hash_warning)
1012 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1013 }
1014
1015 /* Create got section and local_got_refcounts array if they
1016 are needed. */
1017 r_type = elf_s390_tls_transition (info,
1018 ELF32_R_TYPE (rel->r_info),
1019 h == NULL);
1020 switch (r_type)
1021 {
1022 case R_390_GOT12:
1023 case R_390_GOT16:
1024 case R_390_GOT20:
1025 case R_390_GOT32:
1026 case R_390_GOTENT:
1027 case R_390_GOTPLT12:
1028 case R_390_GOTPLT16:
1029 case R_390_GOTPLT20:
1030 case R_390_GOTPLT32:
1031 case R_390_GOTPLTENT:
1032 case R_390_TLS_GD32:
1033 case R_390_TLS_GOTIE12:
1034 case R_390_TLS_GOTIE20:
1035 case R_390_TLS_GOTIE32:
1036 case R_390_TLS_IEENT:
1037 case R_390_TLS_IE32:
1038 case R_390_TLS_LDM32:
1039 if (h == NULL
1040 && local_got_refcounts == NULL)
1041 {
1042 bfd_size_type size;
1043
1044 size = symtab_hdr->sh_info;
1045 size *= (sizeof (bfd_signed_vma) + sizeof(char));
1046 local_got_refcounts = ((bfd_signed_vma *)
1047 bfd_zalloc (abfd, size));
1048 if (local_got_refcounts == NULL)
1049 return FALSE;
1050 elf_local_got_refcounts (abfd) = local_got_refcounts;
1051 elf_s390_local_got_tls_type (abfd)
1052 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1053 }
1054 /* Fall through. */
1055 case R_390_GOTOFF16:
1056 case R_390_GOTOFF32:
1057 case R_390_GOTPC:
1058 case R_390_GOTPCDBL:
1059 if (htab->sgot == NULL)
1060 {
1061 if (htab->elf.dynobj == NULL)
1062 htab->elf.dynobj = abfd;
1063 if (!create_got_section (htab->elf.dynobj, info))
1064 return FALSE;
1065 }
1066 }
1067
1068 switch (r_type)
1069 {
1070 case R_390_GOTOFF16:
1071 case R_390_GOTOFF32:
1072 case R_390_GOTPC:
1073 case R_390_GOTPCDBL:
1074 /* Got is created, nothing to be done. */
1075 break;
1076
1077 case R_390_PLT16DBL:
1078 case R_390_PLT32DBL:
1079 case R_390_PLT32:
1080 case R_390_PLTOFF16:
1081 case R_390_PLTOFF32:
1082 /* This symbol requires a procedure linkage table entry. We
1083 actually build the entry in adjust_dynamic_symbol,
1084 because this might be a case of linking PIC code which is
1085 never referenced by a dynamic object, in which case we
1086 don't need to generate a procedure linkage table entry
1087 after all. */
1088
1089 /* If this is a local symbol, we resolve it directly without
1090 creating a procedure linkage table entry. */
1091 if (h != NULL)
1092 {
1093 h->needs_plt = 1;
1094 h->plt.refcount += 1;
1095 }
1096 break;
1097
1098 case R_390_GOTPLT12:
1099 case R_390_GOTPLT16:
1100 case R_390_GOTPLT20:
1101 case R_390_GOTPLT32:
1102 case R_390_GOTPLTENT:
1103 /* This symbol requires either a procedure linkage table entry
1104 or an entry in the local got. We actually build the entry
1105 in adjust_dynamic_symbol because whether this is really a
1106 global reference can change and with it the fact if we have
1107 to create a plt entry or a local got entry. To be able to
1108 make a once global symbol a local one we have to keep track
1109 of the number of gotplt references that exist for this
1110 symbol. */
1111 if (h != NULL)
1112 {
1113 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1114 h->needs_plt = 1;
1115 h->plt.refcount += 1;
1116 }
1117 else
1118 local_got_refcounts[r_symndx] += 1;
1119 break;
1120
1121 case R_390_TLS_LDM32:
1122 htab->tls_ldm_got.refcount += 1;
1123 break;
1124
1125 case R_390_TLS_IE32:
1126 case R_390_TLS_GOTIE12:
1127 case R_390_TLS_GOTIE20:
1128 case R_390_TLS_GOTIE32:
1129 case R_390_TLS_IEENT:
1130 if (info->shared)
1131 info->flags |= DF_STATIC_TLS;
1132 /* Fall through. */
1133
1134 case R_390_GOT12:
1135 case R_390_GOT16:
1136 case R_390_GOT20:
1137 case R_390_GOT32:
1138 case R_390_GOTENT:
1139 case R_390_TLS_GD32:
1140 /* This symbol requires a global offset table entry. */
1141 switch (r_type)
1142 {
1143 default:
1144 case R_390_GOT12:
1145 case R_390_GOT16:
1146 case R_390_GOT20:
1147 case R_390_GOT32:
1148 case R_390_GOTENT:
1149 tls_type = GOT_NORMAL;
1150 break;
1151 case R_390_TLS_GD32:
1152 tls_type = GOT_TLS_GD;
1153 break;
1154 case R_390_TLS_IE32:
1155 case R_390_TLS_GOTIE32:
1156 tls_type = GOT_TLS_IE;
1157 break;
1158 case R_390_TLS_GOTIE12:
1159 case R_390_TLS_GOTIE20:
1160 case R_390_TLS_IEENT:
1161 tls_type = GOT_TLS_IE_NLT;
1162 break;
1163 }
1164
1165 if (h != NULL)
1166 {
1167 h->got.refcount += 1;
1168 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1169 }
1170 else
1171 {
1172 local_got_refcounts[r_symndx] += 1;
1173 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1174 }
1175 /* If a TLS symbol is accessed using IE at least once,
1176 there is no point to use dynamic model for it. */
1177 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1178 {
1179 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1180 {
1181 (*_bfd_error_handler)
1182 (_("%B: `%s' accessed both as normal and thread local symbol"),
1183 abfd, h->root.root.string);
1184 return FALSE;
1185 }
1186 if (old_tls_type > tls_type)
1187 tls_type = old_tls_type;
1188 }
1189
1190 if (old_tls_type != tls_type)
1191 {
1192 if (h != NULL)
1193 elf_s390_hash_entry (h)->tls_type = tls_type;
1194 else
1195 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1196 }
1197
1198 if (r_type != R_390_TLS_IE32)
1199 break;
1200 /* Fall through. */
1201
1202 case R_390_TLS_LE32:
1203 if (!info->shared)
1204 break;
1205 info->flags |= DF_STATIC_TLS;
1206 /* Fall through. */
1207
1208 case R_390_8:
1209 case R_390_16:
1210 case R_390_32:
1211 case R_390_PC16:
1212 case R_390_PC16DBL:
1213 case R_390_PC32DBL:
1214 case R_390_PC32:
1215 if (h != NULL && !info->shared)
1216 {
1217 /* If this reloc is in a read-only section, we might
1218 need a copy reloc. We can't check reliably at this
1219 stage whether the section is read-only, as input
1220 sections have not yet been mapped to output sections.
1221 Tentatively set the flag for now, and correct in
1222 adjust_dynamic_symbol. */
1223 h->non_got_ref = 1;
1224
1225 /* We may need a .plt entry if the function this reloc
1226 refers to is in a shared lib. */
1227 h->plt.refcount += 1;
1228 }
1229
1230 /* If we are creating a shared library, and this is a reloc
1231 against a global symbol, or a non PC relative reloc
1232 against a local symbol, then we need to copy the reloc
1233 into the shared library. However, if we are linking with
1234 -Bsymbolic, we do not need to copy a reloc against a
1235 global symbol which is defined in an object we are
1236 including in the link (i.e., DEF_REGULAR is set). At
1237 this point we have not seen all the input files, so it is
1238 possible that DEF_REGULAR is not set now but will be set
1239 later (it is never cleared). In case of a weak definition,
1240 DEF_REGULAR may be cleared later by a strong definition in
1241 a shared library. We account for that possibility below by
1242 storing information in the relocs_copied field of the hash
1243 table entry. A similar situation occurs when creating
1244 shared libraries and symbol visibility changes render the
1245 symbol local.
1246
1247 If on the other hand, we are creating an executable, we
1248 may need to keep relocations for symbols satisfied by a
1249 dynamic library if we manage to avoid copy relocs for the
1250 symbol. */
1251 if ((info->shared
1252 && (sec->flags & SEC_ALLOC) != 0
1253 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16
1254 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL
1255 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL
1256 && ELF32_R_TYPE (rel->r_info) != R_390_PC32)
1257 || (h != NULL
1258 && (! SYMBOLIC_BIND (info, h)
1259 || h->root.type == bfd_link_hash_defweak
1260 || !h->def_regular))))
1261 || (ELIMINATE_COPY_RELOCS
1262 && !info->shared
1263 && (sec->flags & SEC_ALLOC) != 0
1264 && h != NULL
1265 && (h->root.type == bfd_link_hash_defweak
1266 || !h->def_regular)))
1267 {
1268 struct elf_s390_dyn_relocs *p;
1269 struct elf_s390_dyn_relocs **head;
1270
1271 /* We must copy these reloc types into the output file.
1272 Create a reloc section in dynobj and make room for
1273 this reloc. */
1274 if (sreloc == NULL)
1275 {
1276 if (htab->elf.dynobj == NULL)
1277 htab->elf.dynobj = abfd;
1278
1279 sreloc = _bfd_elf_make_dynamic_reloc_section
1280 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ TRUE);
1281
1282 if (sreloc == NULL)
1283 return FALSE;
1284 }
1285
1286 /* If this is a global symbol, we count the number of
1287 relocations we need for this symbol. */
1288 if (h != NULL)
1289 {
1290 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1291 }
1292 else
1293 {
1294 /* Track dynamic relocs needed for local syms too.
1295 We really need local syms available to do this
1296 easily. Oh well. */
1297 asection *s;
1298 void *vpp;
1299 Elf_Internal_Sym *isym;
1300
1301 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1302 abfd, r_symndx);
1303 if (isym == NULL)
1304 return FALSE;
1305
1306 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1307 if (s == NULL)
1308 s = sec;
1309
1310 vpp = &elf_section_data (s)->local_dynrel;
1311 head = (struct elf_s390_dyn_relocs **) vpp;
1312 }
1313
1314 p = *head;
1315 if (p == NULL || p->sec != sec)
1316 {
1317 bfd_size_type amt = sizeof *p;
1318
1319 p = ((struct elf_s390_dyn_relocs *)
1320 bfd_alloc (htab->elf.dynobj, amt));
1321 if (p == NULL)
1322 return FALSE;
1323 p->next = *head;
1324 *head = p;
1325 p->sec = sec;
1326 p->count = 0;
1327 p->pc_count = 0;
1328 }
1329
1330 p->count += 1;
1331 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
1332 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
1333 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
1334 || ELF32_R_TYPE (rel->r_info) == R_390_PC32)
1335 p->pc_count += 1;
1336 }
1337 break;
1338
1339 /* This relocation describes the C++ object vtable hierarchy.
1340 Reconstruct it for later use during GC. */
1341 case R_390_GNU_VTINHERIT:
1342 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1343 return FALSE;
1344 break;
1345
1346 /* This relocation describes which C++ vtable entries are actually
1347 used. Record for later use during GC. */
1348 case R_390_GNU_VTENTRY:
1349 BFD_ASSERT (h != NULL);
1350 if (h != NULL
1351 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1352 return FALSE;
1353 break;
1354
1355 default:
1356 break;
1357 }
1358 }
1359
1360 return TRUE;
1361 }
1362
1363 /* Return the section that should be marked against GC for a given
1364 relocation. */
1365
1366 static asection *
1367 elf_s390_gc_mark_hook (asection *sec,
1368 struct bfd_link_info *info,
1369 Elf_Internal_Rela *rel,
1370 struct elf_link_hash_entry *h,
1371 Elf_Internal_Sym *sym)
1372 {
1373 if (h != NULL)
1374 switch (ELF32_R_TYPE (rel->r_info))
1375 {
1376 case R_390_GNU_VTINHERIT:
1377 case R_390_GNU_VTENTRY:
1378 return NULL;
1379 }
1380 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1381
1382 }
1383
1384 /* Update the got entry reference counts for the section being removed. */
1385
1386 static bfd_boolean
1387 elf_s390_gc_sweep_hook (bfd *abfd,
1388 struct bfd_link_info *info,
1389 asection *sec,
1390 const Elf_Internal_Rela *relocs)
1391 {
1392 Elf_Internal_Shdr *symtab_hdr;
1393 struct elf_link_hash_entry **sym_hashes;
1394 bfd_signed_vma *local_got_refcounts;
1395 const Elf_Internal_Rela *rel, *relend;
1396
1397 if (info->relocatable)
1398 return TRUE;
1399
1400 elf_section_data (sec)->local_dynrel = NULL;
1401
1402 symtab_hdr = &elf_symtab_hdr (abfd);
1403 sym_hashes = elf_sym_hashes (abfd);
1404 local_got_refcounts = elf_local_got_refcounts (abfd);
1405
1406 relend = relocs + sec->reloc_count;
1407 for (rel = relocs; rel < relend; rel++)
1408 {
1409 unsigned long r_symndx;
1410 unsigned int r_type;
1411 struct elf_link_hash_entry *h = NULL;
1412
1413 r_symndx = ELF32_R_SYM (rel->r_info);
1414 if (r_symndx >= symtab_hdr->sh_info)
1415 {
1416 struct elf_s390_link_hash_entry *eh;
1417 struct elf_s390_dyn_relocs **pp;
1418 struct elf_s390_dyn_relocs *p;
1419
1420 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1421 while (h->root.type == bfd_link_hash_indirect
1422 || h->root.type == bfd_link_hash_warning)
1423 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1424 eh = (struct elf_s390_link_hash_entry *) h;
1425
1426 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1427 if (p->sec == sec)
1428 {
1429 /* Everything must go for SEC. */
1430 *pp = p->next;
1431 break;
1432 }
1433 }
1434
1435 r_type = ELF32_R_TYPE (rel->r_info);
1436 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1437 switch (r_type)
1438 {
1439 case R_390_TLS_LDM32:
1440 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1441 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1442 break;
1443
1444 case R_390_TLS_GD32:
1445 case R_390_TLS_IE32:
1446 case R_390_TLS_GOTIE12:
1447 case R_390_TLS_GOTIE20:
1448 case R_390_TLS_GOTIE32:
1449 case R_390_TLS_IEENT:
1450 case R_390_GOT12:
1451 case R_390_GOT16:
1452 case R_390_GOT20:
1453 case R_390_GOT32:
1454 case R_390_GOTOFF16:
1455 case R_390_GOTOFF32:
1456 case R_390_GOTPC:
1457 case R_390_GOTPCDBL:
1458 case R_390_GOTENT:
1459 if (h != NULL)
1460 {
1461 if (h->got.refcount > 0)
1462 h->got.refcount -= 1;
1463 }
1464 else if (local_got_refcounts != NULL)
1465 {
1466 if (local_got_refcounts[r_symndx] > 0)
1467 local_got_refcounts[r_symndx] -= 1;
1468 }
1469 break;
1470
1471 case R_390_8:
1472 case R_390_12:
1473 case R_390_16:
1474 case R_390_20:
1475 case R_390_32:
1476 case R_390_PC16:
1477 case R_390_PC16DBL:
1478 case R_390_PC32DBL:
1479 case R_390_PC32:
1480 if (info->shared)
1481 break;
1482 /* Fall through. */
1483
1484 case R_390_PLT16DBL:
1485 case R_390_PLT32DBL:
1486 case R_390_PLT32:
1487 case R_390_PLTOFF16:
1488 case R_390_PLTOFF32:
1489 if (h != NULL)
1490 {
1491 if (h->plt.refcount > 0)
1492 h->plt.refcount -= 1;
1493 }
1494 break;
1495
1496 case R_390_GOTPLT12:
1497 case R_390_GOTPLT16:
1498 case R_390_GOTPLT20:
1499 case R_390_GOTPLT32:
1500 case R_390_GOTPLTENT:
1501 if (h != NULL)
1502 {
1503 if (h->plt.refcount > 0)
1504 {
1505 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1506 h->plt.refcount -= 1;
1507 }
1508 }
1509 else if (local_got_refcounts != NULL)
1510 {
1511 if (local_got_refcounts[r_symndx] > 0)
1512 local_got_refcounts[r_symndx] -= 1;
1513 }
1514 break;
1515
1516 default:
1517 break;
1518 }
1519 }
1520
1521 return TRUE;
1522 }
1523
1524 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1525 entry but we found we will not create any. Called when we find we will
1526 not have any PLT for this symbol, by for example
1527 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1528 or elf_s390_size_dynamic_sections if no dynamic sections will be
1529 created (we're only linking static objects). */
1530
1531 static void
1532 elf_s390_adjust_gotplt (h)
1533 struct elf_s390_link_hash_entry *h;
1534 {
1535 if (h->elf.root.type == bfd_link_hash_warning)
1536 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1537
1538 if (h->gotplt_refcount <= 0)
1539 return;
1540
1541 /* We simply add the number of gotplt references to the number
1542 * of got references for this symbol. */
1543 h->elf.got.refcount += h->gotplt_refcount;
1544 h->gotplt_refcount = -1;
1545 }
1546
1547 /* Adjust a symbol defined by a dynamic object and referenced by a
1548 regular object. The current definition is in some section of the
1549 dynamic object, but we're not including those sections. We have to
1550 change the definition to something the rest of the link can
1551 understand. */
1552
1553 static bfd_boolean
1554 elf_s390_adjust_dynamic_symbol (info, h)
1555 struct bfd_link_info *info;
1556 struct elf_link_hash_entry *h;
1557 {
1558 struct elf_s390_link_hash_table *htab;
1559 asection *s;
1560
1561 /* If this is a function, put it in the procedure linkage table. We
1562 will fill in the contents of the procedure linkage table later
1563 (although we could actually do it here). */
1564 if (h->type == STT_FUNC
1565 || h->needs_plt)
1566 {
1567 if (h->plt.refcount <= 0
1568 || SYMBOL_CALLS_LOCAL (info, h)
1569 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1570 && h->root.type != bfd_link_hash_undefweak))
1571 {
1572 /* This case can occur if we saw a PLT32 reloc in an input
1573 file, but the symbol was never referred to by a dynamic
1574 object, or if all references were garbage collected. In
1575 such a case, we don't actually need to build a procedure
1576 linkage table, and we can just do a PC32 reloc instead. */
1577 h->plt.offset = (bfd_vma) -1;
1578 h->needs_plt = 0;
1579 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1580 }
1581
1582 return TRUE;
1583 }
1584 else
1585 /* It's possible that we incorrectly decided a .plt reloc was
1586 needed for an R_390_PC32 reloc to a non-function sym in
1587 check_relocs. We can't decide accurately between function and
1588 non-function syms in check-relocs; Objects loaded later in
1589 the link may change h->type. So fix it now. */
1590 h->plt.offset = (bfd_vma) -1;
1591
1592 /* If this is a weak symbol, and there is a real definition, the
1593 processor independent code will have arranged for us to see the
1594 real definition first, and we can just use the same value. */
1595 if (h->u.weakdef != NULL)
1596 {
1597 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1598 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1599 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1600 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1601 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1602 h->non_got_ref = h->u.weakdef->non_got_ref;
1603 return TRUE;
1604 }
1605
1606 /* This is a reference to a symbol defined by a dynamic object which
1607 is not a function. */
1608
1609 /* If we are creating a shared library, we must presume that the
1610 only references to the symbol are via the global offset table.
1611 For such cases we need not do anything here; the relocations will
1612 be handled correctly by relocate_section. */
1613 if (info->shared)
1614 return TRUE;
1615
1616 /* If there are no references to this symbol that do not use the
1617 GOT, we don't need to generate a copy reloc. */
1618 if (!h->non_got_ref)
1619 return TRUE;
1620
1621 /* If -z nocopyreloc was given, we won't generate them either. */
1622 if (info->nocopyreloc)
1623 {
1624 h->non_got_ref = 0;
1625 return TRUE;
1626 }
1627
1628 if (ELIMINATE_COPY_RELOCS)
1629 {
1630 struct elf_s390_link_hash_entry * eh;
1631 struct elf_s390_dyn_relocs *p;
1632
1633 eh = (struct elf_s390_link_hash_entry *) h;
1634 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1635 {
1636 s = p->sec->output_section;
1637 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1638 break;
1639 }
1640
1641 /* If we didn't find any dynamic relocs in read-only sections, then
1642 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1643 if (p == NULL)
1644 {
1645 h->non_got_ref = 0;
1646 return TRUE;
1647 }
1648 }
1649
1650 if (h->size == 0)
1651 {
1652 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1653 h->root.root.string);
1654 return TRUE;
1655 }
1656
1657 /* We must allocate the symbol in our .dynbss section, which will
1658 become part of the .bss section of the executable. There will be
1659 an entry for this symbol in the .dynsym section. The dynamic
1660 object will contain position independent code, so all references
1661 from the dynamic object to this symbol will go through the global
1662 offset table. The dynamic linker will use the .dynsym entry to
1663 determine the address it must put in the global offset table, so
1664 both the dynamic object and the regular object will refer to the
1665 same memory location for the variable. */
1666
1667 htab = elf_s390_hash_table (info);
1668
1669 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1670 copy the initial value out of the dynamic object and into the
1671 runtime process image. */
1672 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1673 {
1674 htab->srelbss->size += sizeof (Elf32_External_Rela);
1675 h->needs_copy = 1;
1676 }
1677
1678 s = htab->sdynbss;
1679
1680 return _bfd_elf_adjust_dynamic_copy (h, s);
1681 }
1682
1683 /* Allocate space in .plt, .got and associated reloc sections for
1684 dynamic relocs. */
1685
1686 static bfd_boolean
1687 allocate_dynrelocs (h, inf)
1688 struct elf_link_hash_entry *h;
1689 PTR inf;
1690 {
1691 struct bfd_link_info *info;
1692 struct elf_s390_link_hash_table *htab;
1693 struct elf_s390_link_hash_entry *eh;
1694 struct elf_s390_dyn_relocs *p;
1695
1696 if (h->root.type == bfd_link_hash_indirect)
1697 return TRUE;
1698
1699 if (h->root.type == bfd_link_hash_warning)
1700 /* When warning symbols are created, they **replace** the "real"
1701 entry in the hash table, thus we never get to see the real
1702 symbol in a hash traversal. So look at it now. */
1703 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1704
1705 info = (struct bfd_link_info *) inf;
1706 htab = elf_s390_hash_table (info);
1707
1708 if (htab->elf.dynamic_sections_created
1709 && h->plt.refcount > 0)
1710 {
1711 /* Make sure this symbol is output as a dynamic symbol.
1712 Undefined weak syms won't yet be marked as dynamic. */
1713 if (h->dynindx == -1
1714 && !h->forced_local)
1715 {
1716 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1717 return FALSE;
1718 }
1719
1720 if (info->shared
1721 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1722 {
1723 asection *s = htab->splt;
1724
1725 /* If this is the first .plt entry, make room for the special
1726 first entry. */
1727 if (s->size == 0)
1728 s->size += PLT_FIRST_ENTRY_SIZE;
1729
1730 h->plt.offset = s->size;
1731
1732 /* If this symbol is not defined in a regular file, and we are
1733 not generating a shared library, then set the symbol to this
1734 location in the .plt. This is required to make function
1735 pointers compare as equal between the normal executable and
1736 the shared library. */
1737 if (! info->shared
1738 && !h->def_regular)
1739 {
1740 h->root.u.def.section = s;
1741 h->root.u.def.value = h->plt.offset;
1742 }
1743
1744 /* Make room for this entry. */
1745 s->size += PLT_ENTRY_SIZE;
1746
1747 /* We also need to make an entry in the .got.plt section, which
1748 will be placed in the .got section by the linker script. */
1749 htab->sgotplt->size += GOT_ENTRY_SIZE;
1750
1751 /* We also need to make an entry in the .rela.plt section. */
1752 htab->srelplt->size += sizeof (Elf32_External_Rela);
1753 }
1754 else
1755 {
1756 h->plt.offset = (bfd_vma) -1;
1757 h->needs_plt = 0;
1758 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1759 }
1760 }
1761 else
1762 {
1763 h->plt.offset = (bfd_vma) -1;
1764 h->needs_plt = 0;
1765 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1766 }
1767
1768 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to
1769 the binary, we can optimize a bit. IE32 and GOTIE32 get converted
1770 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT
1771 we can save the dynamic TLS relocation. */
1772 if (h->got.refcount > 0
1773 && !info->shared
1774 && h->dynindx == -1
1775 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1776 {
1777 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1778 /* For the GOTIE access without a literal pool entry the offset has
1779 to be stored somewhere. The immediate value in the instruction
1780 is not bit enough so the value is stored in the got. */
1781 {
1782 h->got.offset = htab->sgot->size;
1783 htab->sgot->size += GOT_ENTRY_SIZE;
1784 }
1785 else
1786 h->got.offset = (bfd_vma) -1;
1787 }
1788 else if (h->got.refcount > 0)
1789 {
1790 asection *s;
1791 bfd_boolean dyn;
1792 int tls_type = elf_s390_hash_entry(h)->tls_type;
1793
1794 /* Make sure this symbol is output as a dynamic symbol.
1795 Undefined weak syms won't yet be marked as dynamic. */
1796 if (h->dynindx == -1
1797 && !h->forced_local)
1798 {
1799 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1800 return FALSE;
1801 }
1802
1803 s = htab->sgot;
1804 h->got.offset = s->size;
1805 s->size += GOT_ENTRY_SIZE;
1806 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */
1807 if (tls_type == GOT_TLS_GD)
1808 s->size += GOT_ENTRY_SIZE;
1809 dyn = htab->elf.dynamic_sections_created;
1810 /* R_390_TLS_IE32 needs one dynamic relocation,
1811 R_390_TLS_GD32 needs one if local symbol and two if global. */
1812 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1813 || tls_type >= GOT_TLS_IE)
1814 htab->srelgot->size += sizeof (Elf32_External_Rela);
1815 else if (tls_type == GOT_TLS_GD)
1816 htab->srelgot->size += 2 * sizeof (Elf32_External_Rela);
1817 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1818 || h->root.type != bfd_link_hash_undefweak)
1819 && (info->shared
1820 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1821 htab->srelgot->size += sizeof (Elf32_External_Rela);
1822 }
1823 else
1824 h->got.offset = (bfd_vma) -1;
1825
1826 eh = (struct elf_s390_link_hash_entry *) h;
1827 if (eh->dyn_relocs == NULL)
1828 return TRUE;
1829
1830 /* In the shared -Bsymbolic case, discard space allocated for
1831 dynamic pc-relative relocs against symbols which turn out to be
1832 defined in regular objects. For the normal shared case, discard
1833 space for pc-relative relocs that have become local due to symbol
1834 visibility changes. */
1835
1836 if (info->shared)
1837 {
1838 if (SYMBOL_CALLS_LOCAL (info, h))
1839 {
1840 struct elf_s390_dyn_relocs **pp;
1841
1842 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1843 {
1844 p->count -= p->pc_count;
1845 p->pc_count = 0;
1846 if (p->count == 0)
1847 *pp = p->next;
1848 else
1849 pp = &p->next;
1850 }
1851 }
1852
1853 /* Also discard relocs on undefined weak syms with non-default
1854 visibility. */
1855 if (eh->dyn_relocs != NULL
1856 && h->root.type == bfd_link_hash_undefweak)
1857 {
1858 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1859 eh->dyn_relocs = NULL;
1860
1861 /* Make sure undefined weak symbols are output as a dynamic
1862 symbol in PIEs. */
1863 else if (h->dynindx == -1
1864 && !h->forced_local)
1865 {
1866 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1867 return FALSE;
1868 }
1869 }
1870 }
1871 else if (ELIMINATE_COPY_RELOCS)
1872 {
1873 /* For the non-shared case, discard space for relocs against
1874 symbols which turn out to need copy relocs or are not
1875 dynamic. */
1876
1877 if (!h->non_got_ref
1878 && ((h->def_dynamic
1879 && !h->def_regular)
1880 || (htab->elf.dynamic_sections_created
1881 && (h->root.type == bfd_link_hash_undefweak
1882 || h->root.type == bfd_link_hash_undefined))))
1883 {
1884 /* Make sure this symbol is output as a dynamic symbol.
1885 Undefined weak syms won't yet be marked as dynamic. */
1886 if (h->dynindx == -1
1887 && !h->forced_local)
1888 {
1889 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1890 return FALSE;
1891 }
1892
1893 /* If that succeeded, we know we'll be keeping all the
1894 relocs. */
1895 if (h->dynindx != -1)
1896 goto keep;
1897 }
1898
1899 eh->dyn_relocs = NULL;
1900
1901 keep: ;
1902 }
1903
1904 /* Finally, allocate space. */
1905 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1906 {
1907 asection *sreloc = elf_section_data (p->sec)->sreloc;
1908
1909 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1910 }
1911
1912 return TRUE;
1913 }
1914
1915 /* Find any dynamic relocs that apply to read-only sections. */
1916
1917 static bfd_boolean
1918 readonly_dynrelocs (h, inf)
1919 struct elf_link_hash_entry *h;
1920 PTR inf;
1921 {
1922 struct elf_s390_link_hash_entry *eh;
1923 struct elf_s390_dyn_relocs *p;
1924
1925 if (h->root.type == bfd_link_hash_warning)
1926 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1927
1928 eh = (struct elf_s390_link_hash_entry *) h;
1929 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1930 {
1931 asection *s = p->sec->output_section;
1932
1933 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1934 {
1935 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1936
1937 info->flags |= DF_TEXTREL;
1938
1939 /* Not an error, just cut short the traversal. */
1940 return FALSE;
1941 }
1942 }
1943 return TRUE;
1944 }
1945
1946 /* Set the sizes of the dynamic sections. */
1947
1948 static bfd_boolean
1949 elf_s390_size_dynamic_sections (output_bfd, info)
1950 bfd *output_bfd ATTRIBUTE_UNUSED;
1951 struct bfd_link_info *info;
1952 {
1953 struct elf_s390_link_hash_table *htab;
1954 bfd *dynobj;
1955 asection *s;
1956 bfd_boolean relocs;
1957 bfd *ibfd;
1958
1959 htab = elf_s390_hash_table (info);
1960 dynobj = htab->elf.dynobj;
1961 if (dynobj == NULL)
1962 abort ();
1963
1964 if (htab->elf.dynamic_sections_created)
1965 {
1966 /* Set the contents of the .interp section to the interpreter. */
1967 if (info->executable)
1968 {
1969 s = bfd_get_section_by_name (dynobj, ".interp");
1970 if (s == NULL)
1971 abort ();
1972 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1973 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1974 }
1975 }
1976
1977 /* Set up .got offsets for local syms, and space for local dynamic
1978 relocs. */
1979 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1980 {
1981 bfd_signed_vma *local_got;
1982 bfd_signed_vma *end_local_got;
1983 char *local_tls_type;
1984 bfd_size_type locsymcount;
1985 Elf_Internal_Shdr *symtab_hdr;
1986 asection *srela;
1987
1988 if (! is_s390_elf (ibfd))
1989 continue;
1990
1991 for (s = ibfd->sections; s != NULL; s = s->next)
1992 {
1993 struct elf_s390_dyn_relocs *p;
1994
1995 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
1996 {
1997 if (!bfd_is_abs_section (p->sec)
1998 && bfd_is_abs_section (p->sec->output_section))
1999 {
2000 /* Input section has been discarded, either because
2001 it is a copy of a linkonce section or due to
2002 linker script /DISCARD/, so we'll be discarding
2003 the relocs too. */
2004 }
2005 else if (p->count != 0)
2006 {
2007 srela = elf_section_data (p->sec)->sreloc;
2008 srela->size += p->count * sizeof (Elf32_External_Rela);
2009 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2010 info->flags |= DF_TEXTREL;
2011 }
2012 }
2013 }
2014
2015 local_got = elf_local_got_refcounts (ibfd);
2016 if (!local_got)
2017 continue;
2018
2019 symtab_hdr = &elf_symtab_hdr (ibfd);
2020 locsymcount = symtab_hdr->sh_info;
2021 end_local_got = local_got + locsymcount;
2022 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2023 s = htab->sgot;
2024 srela = htab->srelgot;
2025 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2026 {
2027 if (*local_got > 0)
2028 {
2029 *local_got = s->size;
2030 s->size += GOT_ENTRY_SIZE;
2031 if (*local_tls_type == GOT_TLS_GD)
2032 s->size += GOT_ENTRY_SIZE;
2033 if (info->shared)
2034 srela->size += sizeof (Elf32_External_Rela);
2035 }
2036 else
2037 *local_got = (bfd_vma) -1;
2038 }
2039 }
2040
2041 if (htab->tls_ldm_got.refcount > 0)
2042 {
2043 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32
2044 relocs. */
2045 htab->tls_ldm_got.offset = htab->sgot->size;
2046 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2047 htab->srelgot->size += sizeof (Elf32_External_Rela);
2048 }
2049 else
2050 htab->tls_ldm_got.offset = -1;
2051
2052 /* Allocate global sym .plt and .got entries, and space for global
2053 sym dynamic relocs. */
2054 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2055
2056 /* We now have determined the sizes of the various dynamic sections.
2057 Allocate memory for them. */
2058 relocs = FALSE;
2059 for (s = dynobj->sections; s != NULL; s = s->next)
2060 {
2061 if ((s->flags & SEC_LINKER_CREATED) == 0)
2062 continue;
2063
2064 if (s == htab->splt
2065 || s == htab->sgot
2066 || s == htab->sgotplt
2067 || s == htab->sdynbss)
2068 {
2069 /* Strip this section if we don't need it; see the
2070 comment below. */
2071 }
2072 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2073 {
2074 if (s->size != 0)
2075 relocs = TRUE;
2076
2077 /* We use the reloc_count field as a counter if we need
2078 to copy relocs into the output file. */
2079 s->reloc_count = 0;
2080 }
2081 else
2082 {
2083 /* It's not one of our sections, so don't allocate space. */
2084 continue;
2085 }
2086
2087 if (s->size == 0)
2088 {
2089 /* If we don't need this section, strip it from the
2090 output file. This is to handle .rela.bss and
2091 .rela.plt. We must create it in
2092 create_dynamic_sections, because it must be created
2093 before the linker maps input sections to output
2094 sections. The linker does that before
2095 adjust_dynamic_symbol is called, and it is that
2096 function which decides whether anything needs to go
2097 into these sections. */
2098
2099 s->flags |= SEC_EXCLUDE;
2100 continue;
2101 }
2102
2103 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2104 continue;
2105
2106 /* Allocate memory for the section contents. We use bfd_zalloc
2107 here in case unused entries are not reclaimed before the
2108 section's contents are written out. This should not happen,
2109 but this way if it does, we get a R_390_NONE reloc instead
2110 of garbage. */
2111 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2112 if (s->contents == NULL)
2113 return FALSE;
2114 }
2115
2116 if (htab->elf.dynamic_sections_created)
2117 {
2118 /* Add some entries to the .dynamic section. We fill in the
2119 values later, in elf_s390_finish_dynamic_sections, but we
2120 must add the entries now so that we get the correct size for
2121 the .dynamic section. The DT_DEBUG entry is filled in by the
2122 dynamic linker and used by the debugger. */
2123 #define add_dynamic_entry(TAG, VAL) \
2124 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2125
2126 if (info->executable)
2127 {
2128 if (!add_dynamic_entry (DT_DEBUG, 0))
2129 return FALSE;
2130 }
2131
2132 if (htab->splt->size != 0)
2133 {
2134 if (!add_dynamic_entry (DT_PLTGOT, 0)
2135 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2136 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2137 || !add_dynamic_entry (DT_JMPREL, 0))
2138 return FALSE;
2139 }
2140
2141 if (relocs)
2142 {
2143 if (!add_dynamic_entry (DT_RELA, 0)
2144 || !add_dynamic_entry (DT_RELASZ, 0)
2145 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2146 return FALSE;
2147
2148 /* If any dynamic relocs apply to a read-only section,
2149 then we need a DT_TEXTREL entry. */
2150 if ((info->flags & DF_TEXTREL) == 0)
2151 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2152 (PTR) info);
2153
2154 if ((info->flags & DF_TEXTREL) != 0)
2155 {
2156 if (!add_dynamic_entry (DT_TEXTREL, 0))
2157 return FALSE;
2158 }
2159 }
2160 }
2161 #undef add_dynamic_entry
2162
2163 return TRUE;
2164 }
2165
2166 /* Return the base VMA address which should be subtracted from real addresses
2167 when resolving @dtpoff relocation.
2168 This is PT_TLS segment p_vaddr. */
2169
2170 static bfd_vma
2171 dtpoff_base (info)
2172 struct bfd_link_info *info;
2173 {
2174 /* If tls_sec is NULL, we should have signalled an error already. */
2175 if (elf_hash_table (info)->tls_sec == NULL)
2176 return 0;
2177 return elf_hash_table (info)->tls_sec->vma;
2178 }
2179
2180 /* Return the relocation value for @tpoff relocation
2181 if STT_TLS virtual address is ADDRESS. */
2182
2183 static bfd_vma
2184 tpoff (info, address)
2185 struct bfd_link_info *info;
2186 bfd_vma address;
2187 {
2188 struct elf_link_hash_table *htab = elf_hash_table (info);
2189
2190 /* If tls_sec is NULL, we should have signalled an error already. */
2191 if (htab->tls_sec == NULL)
2192 return 0;
2193 return htab->tls_size + htab->tls_sec->vma - address;
2194 }
2195
2196 /* Complain if TLS instruction relocation is against an invalid
2197 instruction. */
2198
2199 static void
2200 invalid_tls_insn (input_bfd, input_section, rel)
2201 bfd *input_bfd;
2202 asection *input_section;
2203 Elf_Internal_Rela *rel;
2204 {
2205 reloc_howto_type *howto;
2206
2207 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info);
2208 (*_bfd_error_handler)
2209 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2210 input_bfd,
2211 input_section,
2212 (long) rel->r_offset,
2213 howto->name);
2214 bfd_set_error (bfd_error_bad_value);
2215 }
2216
2217 /* Relocate a 390 ELF section. */
2218
2219 static bfd_boolean
2220 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2221 contents, relocs, local_syms, local_sections)
2222 bfd *output_bfd;
2223 struct bfd_link_info *info;
2224 bfd *input_bfd;
2225 asection *input_section;
2226 bfd_byte *contents;
2227 Elf_Internal_Rela *relocs;
2228 Elf_Internal_Sym *local_syms;
2229 asection **local_sections;
2230 {
2231 struct elf_s390_link_hash_table *htab;
2232 Elf_Internal_Shdr *symtab_hdr;
2233 struct elf_link_hash_entry **sym_hashes;
2234 bfd_vma *local_got_offsets;
2235 Elf_Internal_Rela *rel;
2236 Elf_Internal_Rela *relend;
2237
2238 BFD_ASSERT (is_s390_elf (input_bfd));
2239
2240 htab = elf_s390_hash_table (info);
2241 symtab_hdr = &elf_symtab_hdr (input_bfd);
2242 sym_hashes = elf_sym_hashes (input_bfd);
2243 local_got_offsets = elf_local_got_offsets (input_bfd);
2244
2245 rel = relocs;
2246 relend = relocs + input_section->reloc_count;
2247 for (; rel < relend; rel++)
2248 {
2249 unsigned int r_type;
2250 reloc_howto_type *howto;
2251 unsigned long r_symndx;
2252 struct elf_link_hash_entry *h;
2253 Elf_Internal_Sym *sym;
2254 asection *sec;
2255 bfd_vma off;
2256 bfd_vma relocation;
2257 bfd_boolean unresolved_reloc;
2258 bfd_reloc_status_type r;
2259 int tls_type;
2260
2261 r_type = ELF32_R_TYPE (rel->r_info);
2262 if (r_type == (int) R_390_GNU_VTINHERIT
2263 || r_type == (int) R_390_GNU_VTENTRY)
2264 continue;
2265 if (r_type >= (int) R_390_max)
2266 {
2267 bfd_set_error (bfd_error_bad_value);
2268 return FALSE;
2269 }
2270
2271 howto = elf_howto_table + r_type;
2272 r_symndx = ELF32_R_SYM (rel->r_info);
2273
2274 h = NULL;
2275 sym = NULL;
2276 sec = NULL;
2277 unresolved_reloc = FALSE;
2278 if (r_symndx < symtab_hdr->sh_info)
2279 {
2280 sym = local_syms + r_symndx;
2281 sec = local_sections[r_symndx];
2282 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2283 }
2284 else
2285 {
2286 bfd_boolean warned ATTRIBUTE_UNUSED;
2287
2288 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2289 r_symndx, symtab_hdr, sym_hashes,
2290 h, sec, relocation,
2291 unresolved_reloc, warned);
2292 }
2293
2294 if (sec != NULL && elf_discarded_section (sec))
2295 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2296 rel, relend, howto, contents);
2297
2298 if (info->relocatable)
2299 continue;
2300
2301 switch (r_type)
2302 {
2303 case R_390_GOTPLT12:
2304 case R_390_GOTPLT16:
2305 case R_390_GOTPLT20:
2306 case R_390_GOTPLT32:
2307 case R_390_GOTPLTENT:
2308 /* There are three cases for a GOTPLT relocation. 1) The
2309 relocation is against the jump slot entry of a plt that
2310 will get emitted to the output file. 2) The relocation
2311 is against the jump slot of a plt entry that has been
2312 removed. elf_s390_adjust_gotplt has created a GOT entry
2313 as replacement. 3) The relocation is against a local symbol.
2314 Cases 2) and 3) are the same as the GOT relocation code
2315 so we just have to test for case 1 and fall through for
2316 the other two. */
2317 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2318 {
2319 bfd_vma plt_index;
2320
2321 /* Calc. index no.
2322 Current offset - size first entry / entry size. */
2323 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2324 PLT_ENTRY_SIZE;
2325
2326 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2327 addr & GOT addr. */
2328 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2329 unresolved_reloc = FALSE;
2330
2331 if (r_type == R_390_GOTPLTENT)
2332 relocation += htab->sgot->output_section->vma;
2333 break;
2334 }
2335 /* Fall through. */
2336
2337 case R_390_GOT12:
2338 case R_390_GOT16:
2339 case R_390_GOT20:
2340 case R_390_GOT32:
2341 case R_390_GOTENT:
2342 /* Relocation is to the entry for this symbol in the global
2343 offset table. */
2344 if (htab->sgot == NULL)
2345 abort ();
2346
2347 if (h != NULL)
2348 {
2349 bfd_boolean dyn;
2350
2351 off = h->got.offset;
2352 dyn = htab->elf.dynamic_sections_created;
2353 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2354 || (info->shared
2355 && SYMBOL_REFERENCES_LOCAL (info, h))
2356 || (ELF_ST_VISIBILITY (h->other)
2357 && h->root.type == bfd_link_hash_undefweak))
2358 {
2359 /* This is actually a static link, or it is a
2360 -Bsymbolic link and the symbol is defined
2361 locally, or the symbol was forced to be local
2362 because of a version file. We must initialize
2363 this entry in the global offset table. Since the
2364 offset must always be a multiple of 2, we use the
2365 least significant bit to record whether we have
2366 initialized it already.
2367
2368 When doing a dynamic link, we create a .rel.got
2369 relocation entry to initialize the value. This
2370 is done in the finish_dynamic_symbol routine. */
2371 if ((off & 1) != 0)
2372 off &= ~1;
2373 else
2374 {
2375 bfd_put_32 (output_bfd, relocation,
2376 htab->sgot->contents + off);
2377 h->got.offset |= 1;
2378 }
2379 }
2380 else
2381 unresolved_reloc = FALSE;
2382 }
2383 else
2384 {
2385 if (local_got_offsets == NULL)
2386 abort ();
2387
2388 off = local_got_offsets[r_symndx];
2389
2390 /* The offset must always be a multiple of 4. We use
2391 the least significant bit to record whether we have
2392 already generated the necessary reloc. */
2393 if ((off & 1) != 0)
2394 off &= ~1;
2395 else
2396 {
2397 bfd_put_32 (output_bfd, relocation,
2398 htab->sgot->contents + off);
2399
2400 if (info->shared)
2401 {
2402 asection *srelgot;
2403 Elf_Internal_Rela outrel;
2404 bfd_byte *loc;
2405
2406 srelgot = htab->srelgot;
2407 if (srelgot == NULL)
2408 abort ();
2409
2410 outrel.r_offset = (htab->sgot->output_section->vma
2411 + htab->sgot->output_offset
2412 + off);
2413 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2414 outrel.r_addend = relocation;
2415 loc = srelgot->contents;
2416 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
2417 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2418 }
2419
2420 local_got_offsets[r_symndx] |= 1;
2421 }
2422 }
2423
2424 if (off >= (bfd_vma) -2)
2425 abort ();
2426
2427 relocation = htab->sgot->output_offset + off;
2428
2429 /* For @GOTENT the relocation is against the offset between
2430 the instruction and the symbols entry in the GOT and not
2431 between the start of the GOT and the symbols entry. We
2432 add the vma of the GOT to get the correct value. */
2433 if ( r_type == R_390_GOTENT
2434 || r_type == R_390_GOTPLTENT)
2435 relocation += htab->sgot->output_section->vma;
2436
2437 break;
2438
2439 case R_390_GOTOFF16:
2440 case R_390_GOTOFF32:
2441 /* Relocation is relative to the start of the global offset
2442 table. */
2443
2444 /* Note that sgot->output_offset is not involved in this
2445 calculation. We always want the start of .got. If we
2446 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2447 permitted by the ABI, we might have to change this
2448 calculation. */
2449 relocation -= htab->sgot->output_section->vma;
2450 break;
2451
2452 case R_390_GOTPC:
2453 case R_390_GOTPCDBL:
2454 /* Use global offset table as symbol value. */
2455 relocation = htab->sgot->output_section->vma;
2456 unresolved_reloc = FALSE;
2457 break;
2458
2459 case R_390_PLT16DBL:
2460 case R_390_PLT32DBL:
2461 case R_390_PLT32:
2462 /* Relocation is to the entry for this symbol in the
2463 procedure linkage table. */
2464
2465 /* Resolve a PLT32 reloc against a local symbol directly,
2466 without using the procedure linkage table. */
2467 if (h == NULL)
2468 break;
2469
2470 if (h->plt.offset == (bfd_vma) -1
2471 || htab->splt == NULL)
2472 {
2473 /* We didn't make a PLT entry for this symbol. This
2474 happens when statically linking PIC code, or when
2475 using -Bsymbolic. */
2476 break;
2477 }
2478
2479 relocation = (htab->splt->output_section->vma
2480 + htab->splt->output_offset
2481 + h->plt.offset);
2482 unresolved_reloc = FALSE;
2483 break;
2484
2485 case R_390_PLTOFF16:
2486 case R_390_PLTOFF32:
2487 /* Relocation is to the entry for this symbol in the
2488 procedure linkage table relative to the start of the GOT. */
2489
2490 /* For local symbols or if we didn't make a PLT entry for
2491 this symbol resolve the symbol directly. */
2492 if ( h == NULL
2493 || h->plt.offset == (bfd_vma) -1
2494 || htab->splt == NULL)
2495 {
2496 relocation -= htab->sgot->output_section->vma;
2497 break;
2498 }
2499
2500 relocation = (htab->splt->output_section->vma
2501 + htab->splt->output_offset
2502 + h->plt.offset
2503 - htab->sgot->output_section->vma);
2504 unresolved_reloc = FALSE;
2505 break;
2506
2507 case R_390_8:
2508 case R_390_16:
2509 case R_390_32:
2510 case R_390_PC16:
2511 case R_390_PC16DBL:
2512 case R_390_PC32DBL:
2513 case R_390_PC32:
2514 if ((input_section->flags & SEC_ALLOC) == 0)
2515 break;
2516
2517 if ((info->shared
2518 && (h == NULL
2519 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2520 || h->root.type != bfd_link_hash_undefweak)
2521 && ((r_type != R_390_PC16
2522 && r_type != R_390_PC16DBL
2523 && r_type != R_390_PC32DBL
2524 && r_type != R_390_PC32)
2525 || !SYMBOL_CALLS_LOCAL (info, h)))
2526 || (ELIMINATE_COPY_RELOCS
2527 && !info->shared
2528 && h != NULL
2529 && h->dynindx != -1
2530 && !h->non_got_ref
2531 && ((h->def_dynamic
2532 && !h->def_regular)
2533 || h->root.type == bfd_link_hash_undefweak
2534 || h->root.type == bfd_link_hash_undefined)))
2535 {
2536 Elf_Internal_Rela outrel;
2537 bfd_boolean skip, relocate;
2538 asection *sreloc;
2539 bfd_byte *loc;
2540
2541 /* When generating a shared object, these relocations
2542 are copied into the output file to be resolved at run
2543 time. */
2544
2545 skip = FALSE;
2546 relocate = FALSE;
2547
2548 outrel.r_offset =
2549 _bfd_elf_section_offset (output_bfd, info, input_section,
2550 rel->r_offset);
2551 if (outrel.r_offset == (bfd_vma) -1)
2552 skip = TRUE;
2553 else if (outrel.r_offset == (bfd_vma) -2)
2554 skip = TRUE, relocate = TRUE;
2555 outrel.r_offset += (input_section->output_section->vma
2556 + input_section->output_offset);
2557
2558 if (skip)
2559 memset (&outrel, 0, sizeof outrel);
2560 else if (h != NULL
2561 && h->dynindx != -1
2562 && (r_type == R_390_PC16
2563 || r_type == R_390_PC16DBL
2564 || r_type == R_390_PC32DBL
2565 || r_type == R_390_PC32
2566 || !info->shared
2567 || !SYMBOLIC_BIND (info, h)
2568 || !h->def_regular))
2569 {
2570 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2571 outrel.r_addend = rel->r_addend;
2572 }
2573 else
2574 {
2575 /* This symbol is local, or marked to become local. */
2576 outrel.r_addend = relocation + rel->r_addend;
2577 if (r_type == R_390_32)
2578 {
2579 relocate = TRUE;
2580 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2581 }
2582 else
2583 {
2584 long sindx;
2585
2586 if (bfd_is_abs_section (sec))
2587 sindx = 0;
2588 else if (sec == NULL || sec->owner == NULL)
2589 {
2590 bfd_set_error(bfd_error_bad_value);
2591 return FALSE;
2592 }
2593 else
2594 {
2595 asection *osec;
2596
2597 osec = sec->output_section;
2598 sindx = elf_section_data (osec)->dynindx;
2599 if (sindx == 0)
2600 {
2601 osec = htab->elf.text_index_section;
2602 sindx = elf_section_data (osec)->dynindx;
2603 }
2604 BFD_ASSERT (sindx != 0);
2605
2606 /* We are turning this relocation into one
2607 against a section symbol, so subtract out
2608 the output section's address but not the
2609 offset of the input section in the output
2610 section. */
2611 outrel.r_addend -= osec->vma;
2612 }
2613 outrel.r_info = ELF32_R_INFO (sindx, r_type);
2614 }
2615 }
2616
2617 sreloc = elf_section_data (input_section)->sreloc;
2618 if (sreloc == NULL)
2619 abort ();
2620
2621 loc = sreloc->contents;
2622 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2623 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2624
2625 /* If this reloc is against an external symbol, we do
2626 not want to fiddle with the addend. Otherwise, we
2627 need to include the symbol value so that it becomes
2628 an addend for the dynamic reloc. */
2629 if (! relocate)
2630 continue;
2631 }
2632 break;
2633
2634 /* Relocations for tls literal pool entries. */
2635 case R_390_TLS_IE32:
2636 if (info->shared)
2637 {
2638 Elf_Internal_Rela outrel;
2639 asection *sreloc;
2640 bfd_byte *loc;
2641
2642 outrel.r_offset = rel->r_offset
2643 + input_section->output_section->vma
2644 + input_section->output_offset;
2645 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2646 sreloc = elf_section_data (input_section)->sreloc;
2647 if (sreloc == NULL)
2648 abort ();
2649 loc = sreloc->contents;
2650 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2651 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2652 }
2653 /* Fall through. */
2654
2655 case R_390_TLS_GD32:
2656 case R_390_TLS_GOTIE32:
2657 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2658 tls_type = GOT_UNKNOWN;
2659 if (h == NULL && local_got_offsets)
2660 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2661 else if (h != NULL)
2662 {
2663 tls_type = elf_s390_hash_entry(h)->tls_type;
2664 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2665 r_type = R_390_TLS_LE32;
2666 }
2667 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE)
2668 r_type = R_390_TLS_IE32;
2669
2670 if (r_type == R_390_TLS_LE32)
2671 {
2672 /* This relocation gets optimized away by the local exec
2673 access optimization. */
2674 BFD_ASSERT (! unresolved_reloc);
2675 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2676 contents + rel->r_offset);
2677 continue;
2678 }
2679
2680 if (htab->sgot == NULL)
2681 abort ();
2682
2683 if (h != NULL)
2684 off = h->got.offset;
2685 else
2686 {
2687 if (local_got_offsets == NULL)
2688 abort ();
2689
2690 off = local_got_offsets[r_symndx];
2691 }
2692
2693 emit_tls_relocs:
2694
2695 if ((off & 1) != 0)
2696 off &= ~1;
2697 else
2698 {
2699 Elf_Internal_Rela outrel;
2700 bfd_byte *loc;
2701 int dr_type, indx;
2702
2703 if (htab->srelgot == NULL)
2704 abort ();
2705
2706 outrel.r_offset = (htab->sgot->output_section->vma
2707 + htab->sgot->output_offset + off);
2708
2709 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2710 if (r_type == R_390_TLS_GD32)
2711 dr_type = R_390_TLS_DTPMOD;
2712 else
2713 dr_type = R_390_TLS_TPOFF;
2714 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2715 outrel.r_addend = relocation - dtpoff_base (info);
2716 else
2717 outrel.r_addend = 0;
2718 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2719 loc = htab->srelgot->contents;
2720 loc += htab->srelgot->reloc_count++
2721 * sizeof (Elf32_External_Rela);
2722 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2723
2724 if (r_type == R_390_TLS_GD32)
2725 {
2726 if (indx == 0)
2727 {
2728 BFD_ASSERT (! unresolved_reloc);
2729 bfd_put_32 (output_bfd,
2730 relocation - dtpoff_base (info),
2731 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2732 }
2733 else
2734 {
2735 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF);
2736 outrel.r_offset += GOT_ENTRY_SIZE;
2737 outrel.r_addend = 0;
2738 htab->srelgot->reloc_count++;
2739 loc += sizeof (Elf32_External_Rela);
2740 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2741 }
2742 }
2743
2744 if (h != NULL)
2745 h->got.offset |= 1;
2746 else
2747 local_got_offsets[r_symndx] |= 1;
2748 }
2749
2750 if (off >= (bfd_vma) -2)
2751 abort ();
2752 if (r_type == ELF32_R_TYPE (rel->r_info))
2753 {
2754 relocation = htab->sgot->output_offset + off;
2755 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT)
2756 relocation += htab->sgot->output_section->vma;
2757 unresolved_reloc = FALSE;
2758 }
2759 else
2760 {
2761 bfd_put_32 (output_bfd, htab->sgot->output_offset + off,
2762 contents + rel->r_offset);
2763 continue;
2764 }
2765 break;
2766
2767 case R_390_TLS_GOTIE12:
2768 case R_390_TLS_GOTIE20:
2769 case R_390_TLS_IEENT:
2770 if (h == NULL)
2771 {
2772 if (local_got_offsets == NULL)
2773 abort();
2774 off = local_got_offsets[r_symndx];
2775 if (info->shared)
2776 goto emit_tls_relocs;
2777 }
2778 else
2779 {
2780 off = h->got.offset;
2781 tls_type = elf_s390_hash_entry(h)->tls_type;
2782 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2783 goto emit_tls_relocs;
2784 }
2785
2786 if (htab->sgot == NULL)
2787 abort ();
2788
2789 BFD_ASSERT (! unresolved_reloc);
2790 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2791 htab->sgot->contents + off);
2792 relocation = htab->sgot->output_offset + off;
2793 if (r_type == R_390_TLS_IEENT)
2794 relocation += htab->sgot->output_section->vma;
2795 unresolved_reloc = FALSE;
2796 break;
2797
2798 case R_390_TLS_LDM32:
2799 if (! info->shared)
2800 /* The literal pool entry this relocation refers to gets ignored
2801 by the optimized code of the local exec model. Do nothing
2802 and the value will turn out zero. */
2803 continue;
2804
2805 if (htab->sgot == NULL)
2806 abort ();
2807
2808 off = htab->tls_ldm_got.offset;
2809 if (off & 1)
2810 off &= ~1;
2811 else
2812 {
2813 Elf_Internal_Rela outrel;
2814 bfd_byte *loc;
2815
2816 if (htab->srelgot == NULL)
2817 abort ();
2818
2819 outrel.r_offset = (htab->sgot->output_section->vma
2820 + htab->sgot->output_offset + off);
2821
2822 bfd_put_32 (output_bfd, 0,
2823 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2824 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD);
2825 outrel.r_addend = 0;
2826 loc = htab->srelgot->contents;
2827 loc += htab->srelgot->reloc_count++
2828 * sizeof (Elf32_External_Rela);
2829 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2830 htab->tls_ldm_got.offset |= 1;
2831 }
2832 relocation = htab->sgot->output_offset + off;
2833 unresolved_reloc = FALSE;
2834 break;
2835
2836 case R_390_TLS_LE32:
2837 if (info->shared)
2838 {
2839 /* Linking a shared library with non-fpic code requires
2840 a R_390_TLS_TPOFF relocation. */
2841 Elf_Internal_Rela outrel;
2842 asection *sreloc;
2843 bfd_byte *loc;
2844 int indx;
2845
2846 outrel.r_offset = rel->r_offset
2847 + input_section->output_section->vma
2848 + input_section->output_offset;
2849 if (h != NULL && h->dynindx != -1)
2850 indx = h->dynindx;
2851 else
2852 indx = 0;
2853 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF);
2854 if (indx == 0)
2855 outrel.r_addend = relocation - dtpoff_base (info);
2856 else
2857 outrel.r_addend = 0;
2858 sreloc = elf_section_data (input_section)->sreloc;
2859 if (sreloc == NULL)
2860 abort ();
2861 loc = sreloc->contents;
2862 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2863 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2864 }
2865 else
2866 {
2867 BFD_ASSERT (! unresolved_reloc);
2868 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2869 contents + rel->r_offset);
2870 }
2871 continue;
2872
2873 case R_390_TLS_LDO32:
2874 if (info->shared)
2875 relocation -= dtpoff_base (info);
2876 else
2877 /* When converting LDO to LE, we must negate. */
2878 relocation = -tpoff (info, relocation);
2879 break;
2880
2881 /* Relocations for tls instructions. */
2882 case R_390_TLS_LOAD:
2883 case R_390_TLS_GDCALL:
2884 case R_390_TLS_LDCALL:
2885 tls_type = GOT_UNKNOWN;
2886 if (h == NULL && local_got_offsets)
2887 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2888 else if (h != NULL)
2889 tls_type = elf_s390_hash_entry(h)->tls_type;
2890
2891 if (tls_type == GOT_TLS_GD)
2892 continue;
2893
2894 if (r_type == R_390_TLS_LOAD)
2895 {
2896 if (!info->shared && (h == NULL || h->dynindx == -1))
2897 {
2898 /* IE->LE transition. Four valid cases:
2899 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0
2900 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0
2901 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0
2902 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2903 unsigned int insn, ry;
2904
2905 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2906 ry = 0;
2907 if ((insn & 0xff00f000) == 0x58000000)
2908 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */
2909 ry = (insn & 0x000f0000);
2910 else if ((insn & 0xff0f0000) == 0x58000000)
2911 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */
2912 ry = (insn & 0x0000f000) << 4;
2913 else if ((insn & 0xff00f000) == 0x5800c000)
2914 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */
2915 ry = (insn & 0x000f0000);
2916 else if ((insn & 0xff0f0000) == 0x580c0000)
2917 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2918 ry = (insn & 0x0000f000) << 4;
2919 else
2920 invalid_tls_insn (input_bfd, input_section, rel);
2921 insn = 0x18000700 | (insn & 0x00f00000) | ry;
2922 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2923 }
2924 }
2925 else if (r_type == R_390_TLS_GDCALL)
2926 {
2927 unsigned int insn;
2928
2929 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2930 if ((insn & 0xff000fff) != 0x4d000000 &&
2931 (insn & 0xffff0000) != 0xc0e50000)
2932 invalid_tls_insn (input_bfd, input_section, rel);
2933 if (!info->shared && (h == NULL || h->dynindx == -1))
2934 {
2935 if ((insn & 0xff000000) == 0x4d000000)
2936 {
2937 /* GD->LE transition.
2938 bas %r14,0(%rx,%r13) -> bc 0,0 */
2939 insn = 0x47000000;
2940 }
2941 else
2942 {
2943 /* GD->LE transition.
2944 brasl %r14,_tls_get_addr@plt -> brcl 0,. */
2945 insn = 0xc0040000;
2946 bfd_put_16 (output_bfd, 0x0000,
2947 contents + rel->r_offset + 4);
2948 }
2949 }
2950 else
2951 {
2952 if ((insn & 0xff000000) == 0x4d000000)
2953 {
2954 /* GD->IE transition.
2955 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */
2956 insn = 0x5822c000;
2957 }
2958 else
2959 {
2960 /* GD->IE transition.
2961 brasl %r14,__tls_get_addr@plt ->
2962 l %r2,0(%r2,%r12) ; bcr 0,0 */
2963 insn = 0x5822c000;
2964 bfd_put_16 (output_bfd, 0x0700,
2965 contents + rel->r_offset + 4);
2966 }
2967 }
2968 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2969 }
2970 else if (r_type == R_390_TLS_LDCALL)
2971 {
2972 if (!info->shared)
2973 {
2974 unsigned int insn;
2975
2976 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2977 if ((insn & 0xff000fff) != 0x4d000000 &&
2978 (insn & 0xffff0000) != 0xc0e50000)
2979 invalid_tls_insn (input_bfd, input_section, rel);
2980 if ((insn & 0xff000000) == 0x4d000000)
2981 {
2982 /* LD->LE transition.
2983 bas %r14,0(%rx,%r13) -> bc 0,0 */
2984 insn = 0x47000000;
2985 }
2986 else
2987 {
2988 /* LD->LE transition.
2989 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2990 insn = 0xc0040000;
2991 bfd_put_16 (output_bfd, 0x0000,
2992 contents + rel->r_offset + 4);
2993 }
2994 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2995 }
2996 }
2997 continue;
2998
2999 default:
3000 break;
3001 }
3002
3003 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3004 because such sections are not SEC_ALLOC and thus ld.so will
3005 not process them. */
3006 if (unresolved_reloc
3007 && !((input_section->flags & SEC_DEBUGGING) != 0
3008 && h->def_dynamic))
3009 (*_bfd_error_handler)
3010 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3011 input_bfd,
3012 input_section,
3013 (long) rel->r_offset,
3014 howto->name,
3015 h->root.root.string);
3016
3017 if (r_type == R_390_20
3018 || r_type == R_390_GOT20
3019 || r_type == R_390_GOTPLT20
3020 || r_type == R_390_TLS_GOTIE20)
3021 {
3022 relocation += rel->r_addend;
3023 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3024 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3025 contents, rel->r_offset,
3026 relocation, 0);
3027 }
3028 else
3029 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3030 contents, rel->r_offset,
3031 relocation, rel->r_addend);
3032
3033 if (r != bfd_reloc_ok)
3034 {
3035 const char *name;
3036
3037 if (h != NULL)
3038 name = h->root.root.string;
3039 else
3040 {
3041 name = bfd_elf_string_from_elf_section (input_bfd,
3042 symtab_hdr->sh_link,
3043 sym->st_name);
3044 if (name == NULL)
3045 return FALSE;
3046 if (*name == '\0')
3047 name = bfd_section_name (input_bfd, sec);
3048 }
3049
3050 if (r == bfd_reloc_overflow)
3051 {
3052
3053 if (! ((*info->callbacks->reloc_overflow)
3054 (info, (h ? &h->root : NULL), name, howto->name,
3055 (bfd_vma) 0, input_bfd, input_section,
3056 rel->r_offset)))
3057 return FALSE;
3058 }
3059 else
3060 {
3061 (*_bfd_error_handler)
3062 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3063 input_bfd, input_section,
3064 (long) rel->r_offset, name, (int) r);
3065 return FALSE;
3066 }
3067 }
3068 }
3069
3070 return TRUE;
3071 }
3072
3073 /* Finish up dynamic symbol handling. We set the contents of various
3074 dynamic sections here. */
3075
3076 static bfd_boolean
3077 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3078 bfd *output_bfd;
3079 struct bfd_link_info *info;
3080 struct elf_link_hash_entry *h;
3081 Elf_Internal_Sym *sym;
3082 {
3083 struct elf_s390_link_hash_table *htab;
3084
3085 htab = elf_s390_hash_table (info);
3086
3087 if (h->plt.offset != (bfd_vma) -1)
3088 {
3089 bfd_vma plt_index;
3090 bfd_vma got_offset;
3091 Elf_Internal_Rela rela;
3092 bfd_byte *loc;
3093 bfd_vma relative_offset;
3094
3095 /* This symbol has an entry in the procedure linkage table. Set
3096 it up. */
3097 if (h->dynindx == -1
3098 || htab->splt == NULL
3099 || htab->sgotplt == NULL
3100 || htab->srelplt == NULL)
3101 abort ();
3102
3103 /* Calc. index no.
3104 Current offset - size first entry / entry size. */
3105 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3106
3107 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
3108 addr & GOT addr. */
3109 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3110
3111 /* S390 uses halfwords for relative branch calc! */
3112 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
3113 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
3114 /* If offset is > 32768, branch to a previous branch
3115 390 can only handle +-64 K jumps. */
3116 if ( -32768 > (int) relative_offset )
3117 relative_offset
3118 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3119
3120 /* Fill in the entry in the procedure linkage table. */
3121 if (!info->shared)
3122 {
3123 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3124 htab->splt->contents + h->plt.offset);
3125 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3126 htab->splt->contents + h->plt.offset + 4);
3127 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3128 htab->splt->contents + h->plt.offset + 8);
3129 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3130 htab->splt->contents + h->plt.offset + 12);
3131 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3132 htab->splt->contents + h->plt.offset + 16);
3133 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3134 htab->splt->contents + h->plt.offset + 20);
3135 bfd_put_32 (output_bfd,
3136 (htab->sgotplt->output_section->vma
3137 + htab->sgotplt->output_offset
3138 + got_offset),
3139 htab->splt->contents + h->plt.offset + 24);
3140 }
3141 else if (got_offset < 4096)
3142 {
3143 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD0 + got_offset,
3144 htab->splt->contents + h->plt.offset);
3145 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD1,
3146 htab->splt->contents + h->plt.offset + 4);
3147 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD2,
3148 htab->splt->contents + h->plt.offset + 8);
3149 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD3,
3150 htab->splt->contents + h->plt.offset + 12);
3151 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD4,
3152 htab->splt->contents + h->plt.offset + 16);
3153 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3154 htab->splt->contents + h->plt.offset + 20);
3155 bfd_put_32 (output_bfd, (bfd_vma) 0,
3156 htab->splt->contents + h->plt.offset + 24);
3157 }
3158 else if (got_offset < 32768)
3159 {
3160 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD0 + got_offset,
3161 htab->splt->contents + h->plt.offset);
3162 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD1,
3163 htab->splt->contents + h->plt.offset + 4);
3164 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD2,
3165 htab->splt->contents + h->plt.offset + 8);
3166 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD3,
3167 htab->splt->contents + h->plt.offset + 12);
3168 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD4,
3169 htab->splt->contents + h->plt.offset + 16);
3170 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3171 htab->splt->contents + h->plt.offset + 20);
3172 bfd_put_32 (output_bfd, (bfd_vma) 0,
3173 htab->splt->contents + h->plt.offset + 24);
3174 }
3175 else
3176 {
3177 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD0,
3178 htab->splt->contents + h->plt.offset);
3179 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD1,
3180 htab->splt->contents + h->plt.offset + 4);
3181 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD2,
3182 htab->splt->contents + h->plt.offset + 8);
3183 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD3,
3184 htab->splt->contents + h->plt.offset + 12);
3185 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD4,
3186 htab->splt->contents + h->plt.offset + 16);
3187 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3188 htab->splt->contents + h->plt.offset + 20);
3189 bfd_put_32 (output_bfd, got_offset,
3190 htab->splt->contents + h->plt.offset + 24);
3191 }
3192 /* Insert offset into reloc. table here. */
3193 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
3194 htab->splt->contents + h->plt.offset + 28);
3195
3196 /* Fill in the entry in the global offset table.
3197 Points to instruction after GOT offset. */
3198 bfd_put_32 (output_bfd,
3199 (htab->splt->output_section->vma
3200 + htab->splt->output_offset
3201 + h->plt.offset
3202 + 12),
3203 htab->sgotplt->contents + got_offset);
3204
3205 /* Fill in the entry in the .rela.plt section. */
3206 rela.r_offset = (htab->sgotplt->output_section->vma
3207 + htab->sgotplt->output_offset
3208 + got_offset);
3209 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3210 rela.r_addend = 0;
3211 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rela);
3212 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3213
3214 if (!h->def_regular)
3215 {
3216 /* Mark the symbol as undefined, rather than as defined in
3217 the .plt section. Leave the value alone. This is a clue
3218 for the dynamic linker, to make function pointer
3219 comparisons work between an application and shared
3220 library. */
3221 sym->st_shndx = SHN_UNDEF;
3222 }
3223 }
3224
3225 if (h->got.offset != (bfd_vma) -1
3226 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3227 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3228 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3229 {
3230 Elf_Internal_Rela rela;
3231 bfd_byte *loc;
3232
3233 /* This symbol has an entry in the global offset table. Set it
3234 up. */
3235
3236 if (htab->sgot == NULL || htab->srelgot == NULL)
3237 abort ();
3238
3239 rela.r_offset = (htab->sgot->output_section->vma
3240 + htab->sgot->output_offset
3241 + (h->got.offset &~ (bfd_vma) 1));
3242
3243 /* If this is a static link, or it is a -Bsymbolic link and the
3244 symbol is defined locally or was forced to be local because
3245 of a version file, we just want to emit a RELATIVE reloc.
3246 The entry in the global offset table will already have been
3247 initialized in the relocate_section function. */
3248 if (info->shared
3249 && SYMBOL_REFERENCES_LOCAL (info, h))
3250 {
3251 if (!h->def_regular)
3252 return FALSE;
3253 BFD_ASSERT((h->got.offset & 1) != 0);
3254 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
3255 rela.r_addend = (h->root.u.def.value
3256 + h->root.u.def.section->output_section->vma
3257 + h->root.u.def.section->output_offset);
3258 }
3259 else
3260 {
3261 BFD_ASSERT((h->got.offset & 1) == 0);
3262 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3263 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
3264 rela.r_addend = 0;
3265 }
3266
3267 loc = htab->srelgot->contents;
3268 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3269 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3270 }
3271
3272 if (h->needs_copy)
3273 {
3274 Elf_Internal_Rela rela;
3275 bfd_byte *loc;
3276
3277 /* This symbols needs a copy reloc. Set it up. */
3278
3279 if (h->dynindx == -1
3280 || (h->root.type != bfd_link_hash_defined
3281 && h->root.type != bfd_link_hash_defweak)
3282 || htab->srelbss == NULL)
3283 abort ();
3284
3285 rela.r_offset = (h->root.u.def.value
3286 + h->root.u.def.section->output_section->vma
3287 + h->root.u.def.section->output_offset);
3288 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
3289 rela.r_addend = 0;
3290 loc = htab->srelbss->contents;
3291 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rela);
3292 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3293 }
3294
3295 /* Mark some specially defined symbols as absolute. */
3296 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3297 || h == htab->elf.hgot
3298 || h == htab->elf.hplt)
3299 sym->st_shndx = SHN_ABS;
3300
3301 return TRUE;
3302 }
3303
3304 /* Used to decide how to sort relocs in an optimal manner for the
3305 dynamic linker, before writing them out. */
3306
3307 static enum elf_reloc_type_class
3308 elf_s390_reloc_type_class (rela)
3309 const Elf_Internal_Rela *rela;
3310 {
3311 switch ((int) ELF32_R_TYPE (rela->r_info))
3312 {
3313 case R_390_RELATIVE:
3314 return reloc_class_relative;
3315 case R_390_JMP_SLOT:
3316 return reloc_class_plt;
3317 case R_390_COPY:
3318 return reloc_class_copy;
3319 default:
3320 return reloc_class_normal;
3321 }
3322 }
3323
3324 /* Finish up the dynamic sections. */
3325
3326 static bfd_boolean
3327 elf_s390_finish_dynamic_sections (output_bfd, info)
3328 bfd *output_bfd;
3329 struct bfd_link_info *info;
3330 {
3331 struct elf_s390_link_hash_table *htab;
3332 bfd *dynobj;
3333 asection *sdyn;
3334
3335 htab = elf_s390_hash_table (info);
3336 dynobj = htab->elf.dynobj;
3337 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3338
3339 if (htab->elf.dynamic_sections_created)
3340 {
3341 Elf32_External_Dyn *dyncon, *dynconend;
3342
3343 if (sdyn == NULL || htab->sgot == NULL)
3344 abort ();
3345
3346 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3347 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3348 for (; dyncon < dynconend; dyncon++)
3349 {
3350 Elf_Internal_Dyn dyn;
3351 asection *s;
3352
3353 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3354
3355 switch (dyn.d_tag)
3356 {
3357 default:
3358 continue;
3359
3360 case DT_PLTGOT:
3361 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3362 break;
3363
3364 case DT_JMPREL:
3365 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3366 break;
3367
3368 case DT_PLTRELSZ:
3369 s = htab->srelplt->output_section;
3370 dyn.d_un.d_val = s->size;
3371 break;
3372 }
3373
3374 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3375 }
3376
3377 /* Fill in the special first entry in the procedure linkage table. */
3378 if (htab->splt && htab->splt->size > 0)
3379 {
3380 memset (htab->splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
3381 if (info->shared)
3382 {
3383 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD0,
3384 htab->splt->contents );
3385 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD1,
3386 htab->splt->contents +4 );
3387 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD2,
3388 htab->splt->contents +8 );
3389 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD3,
3390 htab->splt->contents +12 );
3391 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD4,
3392 htab->splt->contents +16 );
3393 }
3394 else
3395 {
3396 bfd_put_32 (output_bfd, (bfd_vma)PLT_FIRST_ENTRY_WORD0,
3397 htab->splt->contents );
3398 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3399 htab->splt->contents +4 );
3400 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD2,
3401 htab->splt->contents +8 );
3402 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3403 htab->splt->contents +12 );
3404 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3405 htab->splt->contents +16 );
3406 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3407 htab->splt->contents +20 );
3408 bfd_put_32 (output_bfd,
3409 htab->sgotplt->output_section->vma
3410 + htab->sgotplt->output_offset,
3411 htab->splt->contents + 24);
3412 }
3413 elf_section_data (htab->splt->output_section)
3414 ->this_hdr.sh_entsize = 4;
3415 }
3416
3417 }
3418
3419 if (htab->sgotplt)
3420 {
3421 /* Fill in the first three entries in the global offset table. */
3422 if (htab->sgotplt->size > 0)
3423 {
3424 bfd_put_32 (output_bfd,
3425 (sdyn == NULL ? (bfd_vma) 0
3426 : sdyn->output_section->vma + sdyn->output_offset),
3427 htab->sgotplt->contents);
3428 /* One entry for shared object struct ptr. */
3429 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4);
3430 /* One entry for _dl_runtime_resolve. */
3431 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3432 }
3433
3434 elf_section_data (htab->sgotplt->output_section)
3435 ->this_hdr.sh_entsize = 4;
3436 }
3437 return TRUE;
3438 }
3439
3440 static bfd_boolean
3441 elf_s390_grok_prstatus (abfd, note)
3442 bfd * abfd;
3443 Elf_Internal_Note * note;
3444 {
3445 int offset;
3446 unsigned int size;
3447
3448 switch (note->descsz)
3449 {
3450 default:
3451 return FALSE;
3452
3453 case 224: /* S/390 Linux. */
3454 /* pr_cursig */
3455 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3456
3457 /* pr_pid */
3458 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 24);
3459
3460 /* pr_reg */
3461 offset = 72;
3462 size = 144;
3463 break;
3464 }
3465
3466 /* Make a ".reg/999" section. */
3467 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3468 size, note->descpos + offset);
3469 }
3470
3471 /* Return address for Ith PLT stub in section PLT, for relocation REL
3472 or (bfd_vma) -1 if it should not be included. */
3473
3474 static bfd_vma
3475 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3476 const arelent *rel ATTRIBUTE_UNUSED)
3477 {
3478 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3479 }
3480
3481 static bfd_boolean
3482 elf32_s390_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
3483 {
3484 elf_elfheader (obfd)->e_flags |= elf_elfheader (ibfd)->e_flags;
3485 return TRUE;
3486 }
3487
3488
3489 #define TARGET_BIG_SYM bfd_elf32_s390_vec
3490 #define TARGET_BIG_NAME "elf32-s390"
3491 #define ELF_ARCH bfd_arch_s390
3492 #define ELF_TARGET_ID S390_ELF_DATA
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 bfd_elf32_bfd_merge_private_bfd_data elf32_s390_merge_private_bfd_data
3513
3514 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3515 #define elf_backend_check_relocs elf_s390_check_relocs
3516 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3517 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3518 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3519 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3520 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3521 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3522 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3523 #define elf_backend_relocate_section elf_s390_relocate_section
3524 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3525 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3526 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3527 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
3528 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3529
3530 #define bfd_elf32_mkobject elf_s390_mkobject
3531 #define elf_backend_object_p elf_s390_object_p
3532
3533 #include "elf32-target.h"
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