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[deliverable/binutils-gdb.git] / bfd / elf32-s390.c
1 /* IBM S/390-specific support for 32-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
3 2011 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 info = (struct bfd_link_info *) inf;
1700 htab = elf_s390_hash_table (info);
1701
1702 if (htab->elf.dynamic_sections_created
1703 && h->plt.refcount > 0)
1704 {
1705 /* Make sure this symbol is output as a dynamic symbol.
1706 Undefined weak syms won't yet be marked as dynamic. */
1707 if (h->dynindx == -1
1708 && !h->forced_local)
1709 {
1710 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1711 return FALSE;
1712 }
1713
1714 if (info->shared
1715 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1716 {
1717 asection *s = htab->splt;
1718
1719 /* If this is the first .plt entry, make room for the special
1720 first entry. */
1721 if (s->size == 0)
1722 s->size += PLT_FIRST_ENTRY_SIZE;
1723
1724 h->plt.offset = s->size;
1725
1726 /* If this symbol is not defined in a regular file, and we are
1727 not generating a shared library, then set the symbol to this
1728 location in the .plt. This is required to make function
1729 pointers compare as equal between the normal executable and
1730 the shared library. */
1731 if (! info->shared
1732 && !h->def_regular)
1733 {
1734 h->root.u.def.section = s;
1735 h->root.u.def.value = h->plt.offset;
1736 }
1737
1738 /* Make room for this entry. */
1739 s->size += PLT_ENTRY_SIZE;
1740
1741 /* We also need to make an entry in the .got.plt section, which
1742 will be placed in the .got section by the linker script. */
1743 htab->sgotplt->size += GOT_ENTRY_SIZE;
1744
1745 /* We also need to make an entry in the .rela.plt section. */
1746 htab->srelplt->size += sizeof (Elf32_External_Rela);
1747 }
1748 else
1749 {
1750 h->plt.offset = (bfd_vma) -1;
1751 h->needs_plt = 0;
1752 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1753 }
1754 }
1755 else
1756 {
1757 h->plt.offset = (bfd_vma) -1;
1758 h->needs_plt = 0;
1759 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1760 }
1761
1762 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to
1763 the binary, we can optimize a bit. IE32 and GOTIE32 get converted
1764 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT
1765 we can save the dynamic TLS relocation. */
1766 if (h->got.refcount > 0
1767 && !info->shared
1768 && h->dynindx == -1
1769 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1770 {
1771 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1772 /* For the GOTIE access without a literal pool entry the offset has
1773 to be stored somewhere. The immediate value in the instruction
1774 is not bit enough so the value is stored in the got. */
1775 {
1776 h->got.offset = htab->sgot->size;
1777 htab->sgot->size += GOT_ENTRY_SIZE;
1778 }
1779 else
1780 h->got.offset = (bfd_vma) -1;
1781 }
1782 else if (h->got.refcount > 0)
1783 {
1784 asection *s;
1785 bfd_boolean dyn;
1786 int tls_type = elf_s390_hash_entry(h)->tls_type;
1787
1788 /* Make sure this symbol is output as a dynamic symbol.
1789 Undefined weak syms won't yet be marked as dynamic. */
1790 if (h->dynindx == -1
1791 && !h->forced_local)
1792 {
1793 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1794 return FALSE;
1795 }
1796
1797 s = htab->sgot;
1798 h->got.offset = s->size;
1799 s->size += GOT_ENTRY_SIZE;
1800 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */
1801 if (tls_type == GOT_TLS_GD)
1802 s->size += GOT_ENTRY_SIZE;
1803 dyn = htab->elf.dynamic_sections_created;
1804 /* R_390_TLS_IE32 needs one dynamic relocation,
1805 R_390_TLS_GD32 needs one if local symbol and two if global. */
1806 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1807 || tls_type >= GOT_TLS_IE)
1808 htab->srelgot->size += sizeof (Elf32_External_Rela);
1809 else if (tls_type == GOT_TLS_GD)
1810 htab->srelgot->size += 2 * sizeof (Elf32_External_Rela);
1811 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1812 || h->root.type != bfd_link_hash_undefweak)
1813 && (info->shared
1814 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1815 htab->srelgot->size += sizeof (Elf32_External_Rela);
1816 }
1817 else
1818 h->got.offset = (bfd_vma) -1;
1819
1820 eh = (struct elf_s390_link_hash_entry *) h;
1821 if (eh->dyn_relocs == NULL)
1822 return TRUE;
1823
1824 /* In the shared -Bsymbolic case, discard space allocated for
1825 dynamic pc-relative relocs against symbols which turn out to be
1826 defined in regular objects. For the normal shared case, discard
1827 space for pc-relative relocs that have become local due to symbol
1828 visibility changes. */
1829
1830 if (info->shared)
1831 {
1832 if (SYMBOL_CALLS_LOCAL (info, h))
1833 {
1834 struct elf_s390_dyn_relocs **pp;
1835
1836 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1837 {
1838 p->count -= p->pc_count;
1839 p->pc_count = 0;
1840 if (p->count == 0)
1841 *pp = p->next;
1842 else
1843 pp = &p->next;
1844 }
1845 }
1846
1847 /* Also discard relocs on undefined weak syms with non-default
1848 visibility. */
1849 if (eh->dyn_relocs != NULL
1850 && h->root.type == bfd_link_hash_undefweak)
1851 {
1852 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1853 eh->dyn_relocs = NULL;
1854
1855 /* Make sure undefined weak symbols are output as a dynamic
1856 symbol in PIEs. */
1857 else if (h->dynindx == -1
1858 && !h->forced_local)
1859 {
1860 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1861 return FALSE;
1862 }
1863 }
1864 }
1865 else if (ELIMINATE_COPY_RELOCS)
1866 {
1867 /* For the non-shared case, discard space for relocs against
1868 symbols which turn out to need copy relocs or are not
1869 dynamic. */
1870
1871 if (!h->non_got_ref
1872 && ((h->def_dynamic
1873 && !h->def_regular)
1874 || (htab->elf.dynamic_sections_created
1875 && (h->root.type == bfd_link_hash_undefweak
1876 || h->root.type == bfd_link_hash_undefined))))
1877 {
1878 /* Make sure this symbol is output as a dynamic symbol.
1879 Undefined weak syms won't yet be marked as dynamic. */
1880 if (h->dynindx == -1
1881 && !h->forced_local)
1882 {
1883 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1884 return FALSE;
1885 }
1886
1887 /* If that succeeded, we know we'll be keeping all the
1888 relocs. */
1889 if (h->dynindx != -1)
1890 goto keep;
1891 }
1892
1893 eh->dyn_relocs = NULL;
1894
1895 keep: ;
1896 }
1897
1898 /* Finally, allocate space. */
1899 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1900 {
1901 asection *sreloc = elf_section_data (p->sec)->sreloc;
1902
1903 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1904 }
1905
1906 return TRUE;
1907 }
1908
1909 /* Find any dynamic relocs that apply to read-only sections. */
1910
1911 static bfd_boolean
1912 readonly_dynrelocs (h, inf)
1913 struct elf_link_hash_entry *h;
1914 PTR inf;
1915 {
1916 struct elf_s390_link_hash_entry *eh;
1917 struct elf_s390_dyn_relocs *p;
1918
1919 eh = (struct elf_s390_link_hash_entry *) h;
1920 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1921 {
1922 asection *s = p->sec->output_section;
1923
1924 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1925 {
1926 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1927
1928 info->flags |= DF_TEXTREL;
1929
1930 /* Not an error, just cut short the traversal. */
1931 return FALSE;
1932 }
1933 }
1934 return TRUE;
1935 }
1936
1937 /* Set the sizes of the dynamic sections. */
1938
1939 static bfd_boolean
1940 elf_s390_size_dynamic_sections (output_bfd, info)
1941 bfd *output_bfd ATTRIBUTE_UNUSED;
1942 struct bfd_link_info *info;
1943 {
1944 struct elf_s390_link_hash_table *htab;
1945 bfd *dynobj;
1946 asection *s;
1947 bfd_boolean relocs;
1948 bfd *ibfd;
1949
1950 htab = elf_s390_hash_table (info);
1951 dynobj = htab->elf.dynobj;
1952 if (dynobj == NULL)
1953 abort ();
1954
1955 if (htab->elf.dynamic_sections_created)
1956 {
1957 /* Set the contents of the .interp section to the interpreter. */
1958 if (info->executable)
1959 {
1960 s = bfd_get_section_by_name (dynobj, ".interp");
1961 if (s == NULL)
1962 abort ();
1963 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1964 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1965 }
1966 }
1967
1968 /* Set up .got offsets for local syms, and space for local dynamic
1969 relocs. */
1970 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1971 {
1972 bfd_signed_vma *local_got;
1973 bfd_signed_vma *end_local_got;
1974 char *local_tls_type;
1975 bfd_size_type locsymcount;
1976 Elf_Internal_Shdr *symtab_hdr;
1977 asection *srela;
1978
1979 if (! is_s390_elf (ibfd))
1980 continue;
1981
1982 for (s = ibfd->sections; s != NULL; s = s->next)
1983 {
1984 struct elf_s390_dyn_relocs *p;
1985
1986 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
1987 {
1988 if (!bfd_is_abs_section (p->sec)
1989 && bfd_is_abs_section (p->sec->output_section))
1990 {
1991 /* Input section has been discarded, either because
1992 it is a copy of a linkonce section or due to
1993 linker script /DISCARD/, so we'll be discarding
1994 the relocs too. */
1995 }
1996 else if (p->count != 0)
1997 {
1998 srela = elf_section_data (p->sec)->sreloc;
1999 srela->size += p->count * sizeof (Elf32_External_Rela);
2000 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2001 info->flags |= DF_TEXTREL;
2002 }
2003 }
2004 }
2005
2006 local_got = elf_local_got_refcounts (ibfd);
2007 if (!local_got)
2008 continue;
2009
2010 symtab_hdr = &elf_symtab_hdr (ibfd);
2011 locsymcount = symtab_hdr->sh_info;
2012 end_local_got = local_got + locsymcount;
2013 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2014 s = htab->sgot;
2015 srela = htab->srelgot;
2016 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2017 {
2018 if (*local_got > 0)
2019 {
2020 *local_got = s->size;
2021 s->size += GOT_ENTRY_SIZE;
2022 if (*local_tls_type == GOT_TLS_GD)
2023 s->size += GOT_ENTRY_SIZE;
2024 if (info->shared)
2025 srela->size += sizeof (Elf32_External_Rela);
2026 }
2027 else
2028 *local_got = (bfd_vma) -1;
2029 }
2030 }
2031
2032 if (htab->tls_ldm_got.refcount > 0)
2033 {
2034 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32
2035 relocs. */
2036 htab->tls_ldm_got.offset = htab->sgot->size;
2037 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2038 htab->srelgot->size += sizeof (Elf32_External_Rela);
2039 }
2040 else
2041 htab->tls_ldm_got.offset = -1;
2042
2043 /* Allocate global sym .plt and .got entries, and space for global
2044 sym dynamic relocs. */
2045 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2046
2047 /* We now have determined the sizes of the various dynamic sections.
2048 Allocate memory for them. */
2049 relocs = FALSE;
2050 for (s = dynobj->sections; s != NULL; s = s->next)
2051 {
2052 if ((s->flags & SEC_LINKER_CREATED) == 0)
2053 continue;
2054
2055 if (s == htab->splt
2056 || s == htab->sgot
2057 || s == htab->sgotplt
2058 || s == htab->sdynbss)
2059 {
2060 /* Strip this section if we don't need it; see the
2061 comment below. */
2062 }
2063 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2064 {
2065 if (s->size != 0)
2066 relocs = TRUE;
2067
2068 /* We use the reloc_count field as a counter if we need
2069 to copy relocs into the output file. */
2070 s->reloc_count = 0;
2071 }
2072 else
2073 {
2074 /* It's not one of our sections, so don't allocate space. */
2075 continue;
2076 }
2077
2078 if (s->size == 0)
2079 {
2080 /* If we don't need this section, strip it from the
2081 output file. This is to handle .rela.bss and
2082 .rela.plt. We must create it in
2083 create_dynamic_sections, because it must be created
2084 before the linker maps input sections to output
2085 sections. The linker does that before
2086 adjust_dynamic_symbol is called, and it is that
2087 function which decides whether anything needs to go
2088 into these sections. */
2089
2090 s->flags |= SEC_EXCLUDE;
2091 continue;
2092 }
2093
2094 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2095 continue;
2096
2097 /* Allocate memory for the section contents. We use bfd_zalloc
2098 here in case unused entries are not reclaimed before the
2099 section's contents are written out. This should not happen,
2100 but this way if it does, we get a R_390_NONE reloc instead
2101 of garbage. */
2102 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2103 if (s->contents == NULL)
2104 return FALSE;
2105 }
2106
2107 if (htab->elf.dynamic_sections_created)
2108 {
2109 /* Add some entries to the .dynamic section. We fill in the
2110 values later, in elf_s390_finish_dynamic_sections, but we
2111 must add the entries now so that we get the correct size for
2112 the .dynamic section. The DT_DEBUG entry is filled in by the
2113 dynamic linker and used by the debugger. */
2114 #define add_dynamic_entry(TAG, VAL) \
2115 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2116
2117 if (info->executable)
2118 {
2119 if (!add_dynamic_entry (DT_DEBUG, 0))
2120 return FALSE;
2121 }
2122
2123 if (htab->splt->size != 0)
2124 {
2125 if (!add_dynamic_entry (DT_PLTGOT, 0)
2126 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2127 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2128 || !add_dynamic_entry (DT_JMPREL, 0))
2129 return FALSE;
2130 }
2131
2132 if (relocs)
2133 {
2134 if (!add_dynamic_entry (DT_RELA, 0)
2135 || !add_dynamic_entry (DT_RELASZ, 0)
2136 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2137 return FALSE;
2138
2139 /* If any dynamic relocs apply to a read-only section,
2140 then we need a DT_TEXTREL entry. */
2141 if ((info->flags & DF_TEXTREL) == 0)
2142 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2143 (PTR) info);
2144
2145 if ((info->flags & DF_TEXTREL) != 0)
2146 {
2147 if (!add_dynamic_entry (DT_TEXTREL, 0))
2148 return FALSE;
2149 }
2150 }
2151 }
2152 #undef add_dynamic_entry
2153
2154 return TRUE;
2155 }
2156
2157 /* Return the base VMA address which should be subtracted from real addresses
2158 when resolving @dtpoff relocation.
2159 This is PT_TLS segment p_vaddr. */
2160
2161 static bfd_vma
2162 dtpoff_base (info)
2163 struct bfd_link_info *info;
2164 {
2165 /* If tls_sec is NULL, we should have signalled an error already. */
2166 if (elf_hash_table (info)->tls_sec == NULL)
2167 return 0;
2168 return elf_hash_table (info)->tls_sec->vma;
2169 }
2170
2171 /* Return the relocation value for @tpoff relocation
2172 if STT_TLS virtual address is ADDRESS. */
2173
2174 static bfd_vma
2175 tpoff (info, address)
2176 struct bfd_link_info *info;
2177 bfd_vma address;
2178 {
2179 struct elf_link_hash_table *htab = elf_hash_table (info);
2180
2181 /* If tls_sec is NULL, we should have signalled an error already. */
2182 if (htab->tls_sec == NULL)
2183 return 0;
2184 return htab->tls_size + htab->tls_sec->vma - address;
2185 }
2186
2187 /* Complain if TLS instruction relocation is against an invalid
2188 instruction. */
2189
2190 static void
2191 invalid_tls_insn (input_bfd, input_section, rel)
2192 bfd *input_bfd;
2193 asection *input_section;
2194 Elf_Internal_Rela *rel;
2195 {
2196 reloc_howto_type *howto;
2197
2198 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info);
2199 (*_bfd_error_handler)
2200 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2201 input_bfd,
2202 input_section,
2203 (long) rel->r_offset,
2204 howto->name);
2205 bfd_set_error (bfd_error_bad_value);
2206 }
2207
2208 /* Relocate a 390 ELF section. */
2209
2210 static bfd_boolean
2211 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2212 contents, relocs, local_syms, local_sections)
2213 bfd *output_bfd;
2214 struct bfd_link_info *info;
2215 bfd *input_bfd;
2216 asection *input_section;
2217 bfd_byte *contents;
2218 Elf_Internal_Rela *relocs;
2219 Elf_Internal_Sym *local_syms;
2220 asection **local_sections;
2221 {
2222 struct elf_s390_link_hash_table *htab;
2223 Elf_Internal_Shdr *symtab_hdr;
2224 struct elf_link_hash_entry **sym_hashes;
2225 bfd_vma *local_got_offsets;
2226 Elf_Internal_Rela *rel;
2227 Elf_Internal_Rela *relend;
2228
2229 BFD_ASSERT (is_s390_elf (input_bfd));
2230
2231 htab = elf_s390_hash_table (info);
2232 symtab_hdr = &elf_symtab_hdr (input_bfd);
2233 sym_hashes = elf_sym_hashes (input_bfd);
2234 local_got_offsets = elf_local_got_offsets (input_bfd);
2235
2236 rel = relocs;
2237 relend = relocs + input_section->reloc_count;
2238 for (; rel < relend; rel++)
2239 {
2240 unsigned int r_type;
2241 reloc_howto_type *howto;
2242 unsigned long r_symndx;
2243 struct elf_link_hash_entry *h;
2244 Elf_Internal_Sym *sym;
2245 asection *sec;
2246 bfd_vma off;
2247 bfd_vma relocation;
2248 bfd_boolean unresolved_reloc;
2249 bfd_reloc_status_type r;
2250 int tls_type;
2251
2252 r_type = ELF32_R_TYPE (rel->r_info);
2253 if (r_type == (int) R_390_GNU_VTINHERIT
2254 || r_type == (int) R_390_GNU_VTENTRY)
2255 continue;
2256 if (r_type >= (int) R_390_max)
2257 {
2258 bfd_set_error (bfd_error_bad_value);
2259 return FALSE;
2260 }
2261
2262 howto = elf_howto_table + r_type;
2263 r_symndx = ELF32_R_SYM (rel->r_info);
2264
2265 h = NULL;
2266 sym = NULL;
2267 sec = NULL;
2268 unresolved_reloc = FALSE;
2269 if (r_symndx < symtab_hdr->sh_info)
2270 {
2271 sym = local_syms + r_symndx;
2272 sec = local_sections[r_symndx];
2273 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2274 }
2275 else
2276 {
2277 bfd_boolean warned ATTRIBUTE_UNUSED;
2278
2279 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2280 r_symndx, symtab_hdr, sym_hashes,
2281 h, sec, relocation,
2282 unresolved_reloc, warned);
2283 }
2284
2285 if (sec != NULL && elf_discarded_section (sec))
2286 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2287 rel, relend, howto, contents);
2288
2289 if (info->relocatable)
2290 continue;
2291
2292 switch (r_type)
2293 {
2294 case R_390_GOTPLT12:
2295 case R_390_GOTPLT16:
2296 case R_390_GOTPLT20:
2297 case R_390_GOTPLT32:
2298 case R_390_GOTPLTENT:
2299 /* There are three cases for a GOTPLT relocation. 1) The
2300 relocation is against the jump slot entry of a plt that
2301 will get emitted to the output file. 2) The relocation
2302 is against the jump slot of a plt entry that has been
2303 removed. elf_s390_adjust_gotplt has created a GOT entry
2304 as replacement. 3) The relocation is against a local symbol.
2305 Cases 2) and 3) are the same as the GOT relocation code
2306 so we just have to test for case 1 and fall through for
2307 the other two. */
2308 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2309 {
2310 bfd_vma plt_index;
2311
2312 /* Calc. index no.
2313 Current offset - size first entry / entry size. */
2314 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2315 PLT_ENTRY_SIZE;
2316
2317 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2318 addr & GOT addr. */
2319 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2320 unresolved_reloc = FALSE;
2321
2322 if (r_type == R_390_GOTPLTENT)
2323 relocation += htab->sgot->output_section->vma;
2324 break;
2325 }
2326 /* Fall through. */
2327
2328 case R_390_GOT12:
2329 case R_390_GOT16:
2330 case R_390_GOT20:
2331 case R_390_GOT32:
2332 case R_390_GOTENT:
2333 /* Relocation is to the entry for this symbol in the global
2334 offset table. */
2335 if (htab->sgot == NULL)
2336 abort ();
2337
2338 if (h != NULL)
2339 {
2340 bfd_boolean dyn;
2341
2342 off = h->got.offset;
2343 dyn = htab->elf.dynamic_sections_created;
2344 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2345 || (info->shared
2346 && SYMBOL_REFERENCES_LOCAL (info, h))
2347 || (ELF_ST_VISIBILITY (h->other)
2348 && h->root.type == bfd_link_hash_undefweak))
2349 {
2350 /* This is actually a static link, or it is a
2351 -Bsymbolic link and the symbol is defined
2352 locally, or the symbol was forced to be local
2353 because of a version file. We must initialize
2354 this entry in the global offset table. Since the
2355 offset must always be a multiple of 2, we use the
2356 least significant bit to record whether we have
2357 initialized it already.
2358
2359 When doing a dynamic link, we create a .rel.got
2360 relocation entry to initialize the value. This
2361 is done in the finish_dynamic_symbol routine. */
2362 if ((off & 1) != 0)
2363 off &= ~1;
2364 else
2365 {
2366 bfd_put_32 (output_bfd, relocation,
2367 htab->sgot->contents + off);
2368 h->got.offset |= 1;
2369 }
2370 }
2371 else
2372 unresolved_reloc = FALSE;
2373 }
2374 else
2375 {
2376 if (local_got_offsets == NULL)
2377 abort ();
2378
2379 off = local_got_offsets[r_symndx];
2380
2381 /* The offset must always be a multiple of 4. We use
2382 the least significant bit to record whether we have
2383 already generated the necessary reloc. */
2384 if ((off & 1) != 0)
2385 off &= ~1;
2386 else
2387 {
2388 bfd_put_32 (output_bfd, relocation,
2389 htab->sgot->contents + off);
2390
2391 if (info->shared)
2392 {
2393 asection *srelgot;
2394 Elf_Internal_Rela outrel;
2395 bfd_byte *loc;
2396
2397 srelgot = htab->srelgot;
2398 if (srelgot == NULL)
2399 abort ();
2400
2401 outrel.r_offset = (htab->sgot->output_section->vma
2402 + htab->sgot->output_offset
2403 + off);
2404 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2405 outrel.r_addend = relocation;
2406 loc = srelgot->contents;
2407 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
2408 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2409 }
2410
2411 local_got_offsets[r_symndx] |= 1;
2412 }
2413 }
2414
2415 if (off >= (bfd_vma) -2)
2416 abort ();
2417
2418 relocation = htab->sgot->output_offset + off;
2419
2420 /* For @GOTENT the relocation is against the offset between
2421 the instruction and the symbols entry in the GOT and not
2422 between the start of the GOT and the symbols entry. We
2423 add the vma of the GOT to get the correct value. */
2424 if ( r_type == R_390_GOTENT
2425 || r_type == R_390_GOTPLTENT)
2426 relocation += htab->sgot->output_section->vma;
2427
2428 break;
2429
2430 case R_390_GOTOFF16:
2431 case R_390_GOTOFF32:
2432 /* Relocation is relative to the start of the global offset
2433 table. */
2434
2435 /* Note that sgot->output_offset is not involved in this
2436 calculation. We always want the start of .got. If we
2437 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2438 permitted by the ABI, we might have to change this
2439 calculation. */
2440 relocation -= htab->sgot->output_section->vma;
2441 break;
2442
2443 case R_390_GOTPC:
2444 case R_390_GOTPCDBL:
2445 /* Use global offset table as symbol value. */
2446 relocation = htab->sgot->output_section->vma;
2447 unresolved_reloc = FALSE;
2448 break;
2449
2450 case R_390_PLT16DBL:
2451 case R_390_PLT32DBL:
2452 case R_390_PLT32:
2453 /* Relocation is to the entry for this symbol in the
2454 procedure linkage table. */
2455
2456 /* Resolve a PLT32 reloc against a local symbol directly,
2457 without using the procedure linkage table. */
2458 if (h == NULL)
2459 break;
2460
2461 if (h->plt.offset == (bfd_vma) -1
2462 || htab->splt == NULL)
2463 {
2464 /* We didn't make a PLT entry for this symbol. This
2465 happens when statically linking PIC code, or when
2466 using -Bsymbolic. */
2467 break;
2468 }
2469
2470 relocation = (htab->splt->output_section->vma
2471 + htab->splt->output_offset
2472 + h->plt.offset);
2473 unresolved_reloc = FALSE;
2474 break;
2475
2476 case R_390_PLTOFF16:
2477 case R_390_PLTOFF32:
2478 /* Relocation is to the entry for this symbol in the
2479 procedure linkage table relative to the start of the GOT. */
2480
2481 /* For local symbols or if we didn't make a PLT entry for
2482 this symbol resolve the symbol directly. */
2483 if ( h == NULL
2484 || h->plt.offset == (bfd_vma) -1
2485 || htab->splt == NULL)
2486 {
2487 relocation -= htab->sgot->output_section->vma;
2488 break;
2489 }
2490
2491 relocation = (htab->splt->output_section->vma
2492 + htab->splt->output_offset
2493 + h->plt.offset
2494 - htab->sgot->output_section->vma);
2495 unresolved_reloc = FALSE;
2496 break;
2497
2498 case R_390_8:
2499 case R_390_16:
2500 case R_390_32:
2501 case R_390_PC16:
2502 case R_390_PC16DBL:
2503 case R_390_PC32DBL:
2504 case R_390_PC32:
2505 if ((input_section->flags & SEC_ALLOC) == 0)
2506 break;
2507
2508 if ((info->shared
2509 && (h == NULL
2510 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2511 || h->root.type != bfd_link_hash_undefweak)
2512 && ((r_type != R_390_PC16
2513 && r_type != R_390_PC16DBL
2514 && r_type != R_390_PC32DBL
2515 && r_type != R_390_PC32)
2516 || !SYMBOL_CALLS_LOCAL (info, h)))
2517 || (ELIMINATE_COPY_RELOCS
2518 && !info->shared
2519 && h != NULL
2520 && h->dynindx != -1
2521 && !h->non_got_ref
2522 && ((h->def_dynamic
2523 && !h->def_regular)
2524 || h->root.type == bfd_link_hash_undefweak
2525 || h->root.type == bfd_link_hash_undefined)))
2526 {
2527 Elf_Internal_Rela outrel;
2528 bfd_boolean skip, relocate;
2529 asection *sreloc;
2530 bfd_byte *loc;
2531
2532 /* When generating a shared object, these relocations
2533 are copied into the output file to be resolved at run
2534 time. */
2535
2536 skip = FALSE;
2537 relocate = FALSE;
2538
2539 outrel.r_offset =
2540 _bfd_elf_section_offset (output_bfd, info, input_section,
2541 rel->r_offset);
2542 if (outrel.r_offset == (bfd_vma) -1)
2543 skip = TRUE;
2544 else if (outrel.r_offset == (bfd_vma) -2)
2545 skip = TRUE, relocate = TRUE;
2546 outrel.r_offset += (input_section->output_section->vma
2547 + input_section->output_offset);
2548
2549 if (skip)
2550 memset (&outrel, 0, sizeof outrel);
2551 else if (h != NULL
2552 && h->dynindx != -1
2553 && (r_type == R_390_PC16
2554 || r_type == R_390_PC16DBL
2555 || r_type == R_390_PC32DBL
2556 || r_type == R_390_PC32
2557 || !info->shared
2558 || !SYMBOLIC_BIND (info, h)
2559 || !h->def_regular))
2560 {
2561 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2562 outrel.r_addend = rel->r_addend;
2563 }
2564 else
2565 {
2566 /* This symbol is local, or marked to become local. */
2567 outrel.r_addend = relocation + rel->r_addend;
2568 if (r_type == R_390_32)
2569 {
2570 relocate = TRUE;
2571 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2572 }
2573 else
2574 {
2575 long sindx;
2576
2577 if (bfd_is_abs_section (sec))
2578 sindx = 0;
2579 else if (sec == NULL || sec->owner == NULL)
2580 {
2581 bfd_set_error(bfd_error_bad_value);
2582 return FALSE;
2583 }
2584 else
2585 {
2586 asection *osec;
2587
2588 osec = sec->output_section;
2589 sindx = elf_section_data (osec)->dynindx;
2590 if (sindx == 0)
2591 {
2592 osec = htab->elf.text_index_section;
2593 sindx = elf_section_data (osec)->dynindx;
2594 }
2595 BFD_ASSERT (sindx != 0);
2596
2597 /* We are turning this relocation into one
2598 against a section symbol, so subtract out
2599 the output section's address but not the
2600 offset of the input section in the output
2601 section. */
2602 outrel.r_addend -= osec->vma;
2603 }
2604 outrel.r_info = ELF32_R_INFO (sindx, r_type);
2605 }
2606 }
2607
2608 sreloc = elf_section_data (input_section)->sreloc;
2609 if (sreloc == NULL)
2610 abort ();
2611
2612 loc = sreloc->contents;
2613 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2614 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2615
2616 /* If this reloc is against an external symbol, we do
2617 not want to fiddle with the addend. Otherwise, we
2618 need to include the symbol value so that it becomes
2619 an addend for the dynamic reloc. */
2620 if (! relocate)
2621 continue;
2622 }
2623 break;
2624
2625 /* Relocations for tls literal pool entries. */
2626 case R_390_TLS_IE32:
2627 if (info->shared)
2628 {
2629 Elf_Internal_Rela outrel;
2630 asection *sreloc;
2631 bfd_byte *loc;
2632
2633 outrel.r_offset = rel->r_offset
2634 + input_section->output_section->vma
2635 + input_section->output_offset;
2636 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2637 sreloc = elf_section_data (input_section)->sreloc;
2638 if (sreloc == NULL)
2639 abort ();
2640 loc = sreloc->contents;
2641 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2642 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2643 }
2644 /* Fall through. */
2645
2646 case R_390_TLS_GD32:
2647 case R_390_TLS_GOTIE32:
2648 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2649 tls_type = GOT_UNKNOWN;
2650 if (h == NULL && local_got_offsets)
2651 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2652 else if (h != NULL)
2653 {
2654 tls_type = elf_s390_hash_entry(h)->tls_type;
2655 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2656 r_type = R_390_TLS_LE32;
2657 }
2658 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE)
2659 r_type = R_390_TLS_IE32;
2660
2661 if (r_type == R_390_TLS_LE32)
2662 {
2663 /* This relocation gets optimized away by the local exec
2664 access optimization. */
2665 BFD_ASSERT (! unresolved_reloc);
2666 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2667 contents + rel->r_offset);
2668 continue;
2669 }
2670
2671 if (htab->sgot == NULL)
2672 abort ();
2673
2674 if (h != NULL)
2675 off = h->got.offset;
2676 else
2677 {
2678 if (local_got_offsets == NULL)
2679 abort ();
2680
2681 off = local_got_offsets[r_symndx];
2682 }
2683
2684 emit_tls_relocs:
2685
2686 if ((off & 1) != 0)
2687 off &= ~1;
2688 else
2689 {
2690 Elf_Internal_Rela outrel;
2691 bfd_byte *loc;
2692 int dr_type, indx;
2693
2694 if (htab->srelgot == NULL)
2695 abort ();
2696
2697 outrel.r_offset = (htab->sgot->output_section->vma
2698 + htab->sgot->output_offset + off);
2699
2700 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2701 if (r_type == R_390_TLS_GD32)
2702 dr_type = R_390_TLS_DTPMOD;
2703 else
2704 dr_type = R_390_TLS_TPOFF;
2705 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2706 outrel.r_addend = relocation - dtpoff_base (info);
2707 else
2708 outrel.r_addend = 0;
2709 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2710 loc = htab->srelgot->contents;
2711 loc += htab->srelgot->reloc_count++
2712 * sizeof (Elf32_External_Rela);
2713 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2714
2715 if (r_type == R_390_TLS_GD32)
2716 {
2717 if (indx == 0)
2718 {
2719 BFD_ASSERT (! unresolved_reloc);
2720 bfd_put_32 (output_bfd,
2721 relocation - dtpoff_base (info),
2722 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2723 }
2724 else
2725 {
2726 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF);
2727 outrel.r_offset += GOT_ENTRY_SIZE;
2728 outrel.r_addend = 0;
2729 htab->srelgot->reloc_count++;
2730 loc += sizeof (Elf32_External_Rela);
2731 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2732 }
2733 }
2734
2735 if (h != NULL)
2736 h->got.offset |= 1;
2737 else
2738 local_got_offsets[r_symndx] |= 1;
2739 }
2740
2741 if (off >= (bfd_vma) -2)
2742 abort ();
2743 if (r_type == ELF32_R_TYPE (rel->r_info))
2744 {
2745 relocation = htab->sgot->output_offset + off;
2746 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT)
2747 relocation += htab->sgot->output_section->vma;
2748 unresolved_reloc = FALSE;
2749 }
2750 else
2751 {
2752 bfd_put_32 (output_bfd, htab->sgot->output_offset + off,
2753 contents + rel->r_offset);
2754 continue;
2755 }
2756 break;
2757
2758 case R_390_TLS_GOTIE12:
2759 case R_390_TLS_GOTIE20:
2760 case R_390_TLS_IEENT:
2761 if (h == NULL)
2762 {
2763 if (local_got_offsets == NULL)
2764 abort();
2765 off = local_got_offsets[r_symndx];
2766 if (info->shared)
2767 goto emit_tls_relocs;
2768 }
2769 else
2770 {
2771 off = h->got.offset;
2772 tls_type = elf_s390_hash_entry(h)->tls_type;
2773 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2774 goto emit_tls_relocs;
2775 }
2776
2777 if (htab->sgot == NULL)
2778 abort ();
2779
2780 BFD_ASSERT (! unresolved_reloc);
2781 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2782 htab->sgot->contents + off);
2783 relocation = htab->sgot->output_offset + off;
2784 if (r_type == R_390_TLS_IEENT)
2785 relocation += htab->sgot->output_section->vma;
2786 unresolved_reloc = FALSE;
2787 break;
2788
2789 case R_390_TLS_LDM32:
2790 if (! info->shared)
2791 /* The literal pool entry this relocation refers to gets ignored
2792 by the optimized code of the local exec model. Do nothing
2793 and the value will turn out zero. */
2794 continue;
2795
2796 if (htab->sgot == NULL)
2797 abort ();
2798
2799 off = htab->tls_ldm_got.offset;
2800 if (off & 1)
2801 off &= ~1;
2802 else
2803 {
2804 Elf_Internal_Rela outrel;
2805 bfd_byte *loc;
2806
2807 if (htab->srelgot == NULL)
2808 abort ();
2809
2810 outrel.r_offset = (htab->sgot->output_section->vma
2811 + htab->sgot->output_offset + off);
2812
2813 bfd_put_32 (output_bfd, 0,
2814 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2815 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD);
2816 outrel.r_addend = 0;
2817 loc = htab->srelgot->contents;
2818 loc += htab->srelgot->reloc_count++
2819 * sizeof (Elf32_External_Rela);
2820 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2821 htab->tls_ldm_got.offset |= 1;
2822 }
2823 relocation = htab->sgot->output_offset + off;
2824 unresolved_reloc = FALSE;
2825 break;
2826
2827 case R_390_TLS_LE32:
2828 if (info->shared)
2829 {
2830 /* Linking a shared library with non-fpic code requires
2831 a R_390_TLS_TPOFF relocation. */
2832 Elf_Internal_Rela outrel;
2833 asection *sreloc;
2834 bfd_byte *loc;
2835 int indx;
2836
2837 outrel.r_offset = rel->r_offset
2838 + input_section->output_section->vma
2839 + input_section->output_offset;
2840 if (h != NULL && h->dynindx != -1)
2841 indx = h->dynindx;
2842 else
2843 indx = 0;
2844 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF);
2845 if (indx == 0)
2846 outrel.r_addend = relocation - dtpoff_base (info);
2847 else
2848 outrel.r_addend = 0;
2849 sreloc = elf_section_data (input_section)->sreloc;
2850 if (sreloc == NULL)
2851 abort ();
2852 loc = sreloc->contents;
2853 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2854 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2855 }
2856 else
2857 {
2858 BFD_ASSERT (! unresolved_reloc);
2859 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2860 contents + rel->r_offset);
2861 }
2862 continue;
2863
2864 case R_390_TLS_LDO32:
2865 if (info->shared)
2866 relocation -= dtpoff_base (info);
2867 else
2868 /* When converting LDO to LE, we must negate. */
2869 relocation = -tpoff (info, relocation);
2870 break;
2871
2872 /* Relocations for tls instructions. */
2873 case R_390_TLS_LOAD:
2874 case R_390_TLS_GDCALL:
2875 case R_390_TLS_LDCALL:
2876 tls_type = GOT_UNKNOWN;
2877 if (h == NULL && local_got_offsets)
2878 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2879 else if (h != NULL)
2880 tls_type = elf_s390_hash_entry(h)->tls_type;
2881
2882 if (tls_type == GOT_TLS_GD)
2883 continue;
2884
2885 if (r_type == R_390_TLS_LOAD)
2886 {
2887 if (!info->shared && (h == NULL || h->dynindx == -1))
2888 {
2889 /* IE->LE transition. Four valid cases:
2890 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0
2891 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0
2892 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0
2893 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2894 unsigned int insn, ry;
2895
2896 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2897 ry = 0;
2898 if ((insn & 0xff00f000) == 0x58000000)
2899 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */
2900 ry = (insn & 0x000f0000);
2901 else if ((insn & 0xff0f0000) == 0x58000000)
2902 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */
2903 ry = (insn & 0x0000f000) << 4;
2904 else if ((insn & 0xff00f000) == 0x5800c000)
2905 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */
2906 ry = (insn & 0x000f0000);
2907 else if ((insn & 0xff0f0000) == 0x580c0000)
2908 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2909 ry = (insn & 0x0000f000) << 4;
2910 else
2911 invalid_tls_insn (input_bfd, input_section, rel);
2912 insn = 0x18000700 | (insn & 0x00f00000) | ry;
2913 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2914 }
2915 }
2916 else if (r_type == R_390_TLS_GDCALL)
2917 {
2918 unsigned int insn;
2919
2920 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2921 if ((insn & 0xff000fff) != 0x4d000000 &&
2922 (insn & 0xffff0000) != 0xc0e50000)
2923 invalid_tls_insn (input_bfd, input_section, rel);
2924 if (!info->shared && (h == NULL || h->dynindx == -1))
2925 {
2926 if ((insn & 0xff000000) == 0x4d000000)
2927 {
2928 /* GD->LE transition.
2929 bas %r14,0(%rx,%r13) -> bc 0,0 */
2930 insn = 0x47000000;
2931 }
2932 else
2933 {
2934 /* GD->LE transition.
2935 brasl %r14,_tls_get_addr@plt -> brcl 0,. */
2936 insn = 0xc0040000;
2937 bfd_put_16 (output_bfd, 0x0000,
2938 contents + rel->r_offset + 4);
2939 }
2940 }
2941 else
2942 {
2943 if ((insn & 0xff000000) == 0x4d000000)
2944 {
2945 /* GD->IE transition.
2946 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */
2947 insn = 0x5822c000;
2948 }
2949 else
2950 {
2951 /* GD->IE transition.
2952 brasl %r14,__tls_get_addr@plt ->
2953 l %r2,0(%r2,%r12) ; bcr 0,0 */
2954 insn = 0x5822c000;
2955 bfd_put_16 (output_bfd, 0x0700,
2956 contents + rel->r_offset + 4);
2957 }
2958 }
2959 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2960 }
2961 else if (r_type == R_390_TLS_LDCALL)
2962 {
2963 if (!info->shared)
2964 {
2965 unsigned int insn;
2966
2967 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2968 if ((insn & 0xff000fff) != 0x4d000000 &&
2969 (insn & 0xffff0000) != 0xc0e50000)
2970 invalid_tls_insn (input_bfd, input_section, rel);
2971 if ((insn & 0xff000000) == 0x4d000000)
2972 {
2973 /* LD->LE transition.
2974 bas %r14,0(%rx,%r13) -> bc 0,0 */
2975 insn = 0x47000000;
2976 }
2977 else
2978 {
2979 /* LD->LE transition.
2980 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2981 insn = 0xc0040000;
2982 bfd_put_16 (output_bfd, 0x0000,
2983 contents + rel->r_offset + 4);
2984 }
2985 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2986 }
2987 }
2988 continue;
2989
2990 default:
2991 break;
2992 }
2993
2994 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2995 because such sections are not SEC_ALLOC and thus ld.so will
2996 not process them. */
2997 if (unresolved_reloc
2998 && !((input_section->flags & SEC_DEBUGGING) != 0
2999 && h->def_dynamic))
3000 (*_bfd_error_handler)
3001 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3002 input_bfd,
3003 input_section,
3004 (long) rel->r_offset,
3005 howto->name,
3006 h->root.root.string);
3007
3008 if (r_type == R_390_20
3009 || r_type == R_390_GOT20
3010 || r_type == R_390_GOTPLT20
3011 || r_type == R_390_TLS_GOTIE20)
3012 {
3013 relocation += rel->r_addend;
3014 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3015 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3016 contents, rel->r_offset,
3017 relocation, 0);
3018 }
3019 else
3020 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3021 contents, rel->r_offset,
3022 relocation, rel->r_addend);
3023
3024 if (r != bfd_reloc_ok)
3025 {
3026 const char *name;
3027
3028 if (h != NULL)
3029 name = h->root.root.string;
3030 else
3031 {
3032 name = bfd_elf_string_from_elf_section (input_bfd,
3033 symtab_hdr->sh_link,
3034 sym->st_name);
3035 if (name == NULL)
3036 return FALSE;
3037 if (*name == '\0')
3038 name = bfd_section_name (input_bfd, sec);
3039 }
3040
3041 if (r == bfd_reloc_overflow)
3042 {
3043
3044 if (! ((*info->callbacks->reloc_overflow)
3045 (info, (h ? &h->root : NULL), name, howto->name,
3046 (bfd_vma) 0, input_bfd, input_section,
3047 rel->r_offset)))
3048 return FALSE;
3049 }
3050 else
3051 {
3052 (*_bfd_error_handler)
3053 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3054 input_bfd, input_section,
3055 (long) rel->r_offset, name, (int) r);
3056 return FALSE;
3057 }
3058 }
3059 }
3060
3061 return TRUE;
3062 }
3063
3064 /* Finish up dynamic symbol handling. We set the contents of various
3065 dynamic sections here. */
3066
3067 static bfd_boolean
3068 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3069 bfd *output_bfd;
3070 struct bfd_link_info *info;
3071 struct elf_link_hash_entry *h;
3072 Elf_Internal_Sym *sym;
3073 {
3074 struct elf_s390_link_hash_table *htab;
3075
3076 htab = elf_s390_hash_table (info);
3077
3078 if (h->plt.offset != (bfd_vma) -1)
3079 {
3080 bfd_vma plt_index;
3081 bfd_vma got_offset;
3082 Elf_Internal_Rela rela;
3083 bfd_byte *loc;
3084 bfd_vma relative_offset;
3085
3086 /* This symbol has an entry in the procedure linkage table. Set
3087 it up. */
3088 if (h->dynindx == -1
3089 || htab->splt == NULL
3090 || htab->sgotplt == NULL
3091 || htab->srelplt == NULL)
3092 abort ();
3093
3094 /* Calc. index no.
3095 Current offset - size first entry / entry size. */
3096 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3097
3098 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
3099 addr & GOT addr. */
3100 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3101
3102 /* S390 uses halfwords for relative branch calc! */
3103 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
3104 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
3105 /* If offset is > 32768, branch to a previous branch
3106 390 can only handle +-64 K jumps. */
3107 if ( -32768 > (int) relative_offset )
3108 relative_offset
3109 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3110
3111 /* Fill in the entry in the procedure linkage table. */
3112 if (!info->shared)
3113 {
3114 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3115 htab->splt->contents + h->plt.offset);
3116 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3117 htab->splt->contents + h->plt.offset + 4);
3118 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3119 htab->splt->contents + h->plt.offset + 8);
3120 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3121 htab->splt->contents + h->plt.offset + 12);
3122 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3123 htab->splt->contents + h->plt.offset + 16);
3124 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3125 htab->splt->contents + h->plt.offset + 20);
3126 bfd_put_32 (output_bfd,
3127 (htab->sgotplt->output_section->vma
3128 + htab->sgotplt->output_offset
3129 + got_offset),
3130 htab->splt->contents + h->plt.offset + 24);
3131 }
3132 else if (got_offset < 4096)
3133 {
3134 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD0 + got_offset,
3135 htab->splt->contents + h->plt.offset);
3136 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD1,
3137 htab->splt->contents + h->plt.offset + 4);
3138 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD2,
3139 htab->splt->contents + h->plt.offset + 8);
3140 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD3,
3141 htab->splt->contents + h->plt.offset + 12);
3142 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD4,
3143 htab->splt->contents + h->plt.offset + 16);
3144 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3145 htab->splt->contents + h->plt.offset + 20);
3146 bfd_put_32 (output_bfd, (bfd_vma) 0,
3147 htab->splt->contents + h->plt.offset + 24);
3148 }
3149 else if (got_offset < 32768)
3150 {
3151 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD0 + got_offset,
3152 htab->splt->contents + h->plt.offset);
3153 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD1,
3154 htab->splt->contents + h->plt.offset + 4);
3155 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD2,
3156 htab->splt->contents + h->plt.offset + 8);
3157 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD3,
3158 htab->splt->contents + h->plt.offset + 12);
3159 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD4,
3160 htab->splt->contents + h->plt.offset + 16);
3161 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3162 htab->splt->contents + h->plt.offset + 20);
3163 bfd_put_32 (output_bfd, (bfd_vma) 0,
3164 htab->splt->contents + h->plt.offset + 24);
3165 }
3166 else
3167 {
3168 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD0,
3169 htab->splt->contents + h->plt.offset);
3170 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD1,
3171 htab->splt->contents + h->plt.offset + 4);
3172 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD2,
3173 htab->splt->contents + h->plt.offset + 8);
3174 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD3,
3175 htab->splt->contents + h->plt.offset + 12);
3176 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD4,
3177 htab->splt->contents + h->plt.offset + 16);
3178 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3179 htab->splt->contents + h->plt.offset + 20);
3180 bfd_put_32 (output_bfd, got_offset,
3181 htab->splt->contents + h->plt.offset + 24);
3182 }
3183 /* Insert offset into reloc. table here. */
3184 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
3185 htab->splt->contents + h->plt.offset + 28);
3186
3187 /* Fill in the entry in the global offset table.
3188 Points to instruction after GOT offset. */
3189 bfd_put_32 (output_bfd,
3190 (htab->splt->output_section->vma
3191 + htab->splt->output_offset
3192 + h->plt.offset
3193 + 12),
3194 htab->sgotplt->contents + got_offset);
3195
3196 /* Fill in the entry in the .rela.plt section. */
3197 rela.r_offset = (htab->sgotplt->output_section->vma
3198 + htab->sgotplt->output_offset
3199 + got_offset);
3200 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3201 rela.r_addend = 0;
3202 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rela);
3203 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3204
3205 if (!h->def_regular)
3206 {
3207 /* Mark the symbol as undefined, rather than as defined in
3208 the .plt section. Leave the value alone. This is a clue
3209 for the dynamic linker, to make function pointer
3210 comparisons work between an application and shared
3211 library. */
3212 sym->st_shndx = SHN_UNDEF;
3213 }
3214 }
3215
3216 if (h->got.offset != (bfd_vma) -1
3217 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3218 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3219 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3220 {
3221 Elf_Internal_Rela rela;
3222 bfd_byte *loc;
3223
3224 /* This symbol has an entry in the global offset table. Set it
3225 up. */
3226
3227 if (htab->sgot == NULL || htab->srelgot == NULL)
3228 abort ();
3229
3230 rela.r_offset = (htab->sgot->output_section->vma
3231 + htab->sgot->output_offset
3232 + (h->got.offset &~ (bfd_vma) 1));
3233
3234 /* If this is a static link, or it is a -Bsymbolic link and the
3235 symbol is defined locally or was forced to be local because
3236 of a version file, we just want to emit a RELATIVE reloc.
3237 The entry in the global offset table will already have been
3238 initialized in the relocate_section function. */
3239 if (info->shared
3240 && SYMBOL_REFERENCES_LOCAL (info, h))
3241 {
3242 if (!h->def_regular)
3243 return FALSE;
3244 BFD_ASSERT((h->got.offset & 1) != 0);
3245 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
3246 rela.r_addend = (h->root.u.def.value
3247 + h->root.u.def.section->output_section->vma
3248 + h->root.u.def.section->output_offset);
3249 }
3250 else
3251 {
3252 BFD_ASSERT((h->got.offset & 1) == 0);
3253 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3254 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
3255 rela.r_addend = 0;
3256 }
3257
3258 loc = htab->srelgot->contents;
3259 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3260 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3261 }
3262
3263 if (h->needs_copy)
3264 {
3265 Elf_Internal_Rela rela;
3266 bfd_byte *loc;
3267
3268 /* This symbols needs a copy reloc. Set it up. */
3269
3270 if (h->dynindx == -1
3271 || (h->root.type != bfd_link_hash_defined
3272 && h->root.type != bfd_link_hash_defweak)
3273 || htab->srelbss == NULL)
3274 abort ();
3275
3276 rela.r_offset = (h->root.u.def.value
3277 + h->root.u.def.section->output_section->vma
3278 + h->root.u.def.section->output_offset);
3279 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
3280 rela.r_addend = 0;
3281 loc = htab->srelbss->contents;
3282 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rela);
3283 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3284 }
3285
3286 /* Mark some specially defined symbols as absolute. */
3287 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3288 || h == htab->elf.hgot
3289 || h == htab->elf.hplt)
3290 sym->st_shndx = SHN_ABS;
3291
3292 return TRUE;
3293 }
3294
3295 /* Used to decide how to sort relocs in an optimal manner for the
3296 dynamic linker, before writing them out. */
3297
3298 static enum elf_reloc_type_class
3299 elf_s390_reloc_type_class (rela)
3300 const Elf_Internal_Rela *rela;
3301 {
3302 switch ((int) ELF32_R_TYPE (rela->r_info))
3303 {
3304 case R_390_RELATIVE:
3305 return reloc_class_relative;
3306 case R_390_JMP_SLOT:
3307 return reloc_class_plt;
3308 case R_390_COPY:
3309 return reloc_class_copy;
3310 default:
3311 return reloc_class_normal;
3312 }
3313 }
3314
3315 /* Finish up the dynamic sections. */
3316
3317 static bfd_boolean
3318 elf_s390_finish_dynamic_sections (output_bfd, info)
3319 bfd *output_bfd;
3320 struct bfd_link_info *info;
3321 {
3322 struct elf_s390_link_hash_table *htab;
3323 bfd *dynobj;
3324 asection *sdyn;
3325
3326 htab = elf_s390_hash_table (info);
3327 dynobj = htab->elf.dynobj;
3328 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3329
3330 if (htab->elf.dynamic_sections_created)
3331 {
3332 Elf32_External_Dyn *dyncon, *dynconend;
3333
3334 if (sdyn == NULL || htab->sgot == NULL)
3335 abort ();
3336
3337 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3338 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3339 for (; dyncon < dynconend; dyncon++)
3340 {
3341 Elf_Internal_Dyn dyn;
3342 asection *s;
3343
3344 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3345
3346 switch (dyn.d_tag)
3347 {
3348 default:
3349 continue;
3350
3351 case DT_PLTGOT:
3352 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3353 break;
3354
3355 case DT_JMPREL:
3356 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3357 break;
3358
3359 case DT_PLTRELSZ:
3360 s = htab->srelplt->output_section;
3361 dyn.d_un.d_val = s->size;
3362 break;
3363 }
3364
3365 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3366 }
3367
3368 /* Fill in the special first entry in the procedure linkage table. */
3369 if (htab->splt && htab->splt->size > 0)
3370 {
3371 memset (htab->splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
3372 if (info->shared)
3373 {
3374 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD0,
3375 htab->splt->contents );
3376 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD1,
3377 htab->splt->contents +4 );
3378 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD2,
3379 htab->splt->contents +8 );
3380 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD3,
3381 htab->splt->contents +12 );
3382 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD4,
3383 htab->splt->contents +16 );
3384 }
3385 else
3386 {
3387 bfd_put_32 (output_bfd, (bfd_vma)PLT_FIRST_ENTRY_WORD0,
3388 htab->splt->contents );
3389 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3390 htab->splt->contents +4 );
3391 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD2,
3392 htab->splt->contents +8 );
3393 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3394 htab->splt->contents +12 );
3395 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3396 htab->splt->contents +16 );
3397 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3398 htab->splt->contents +20 );
3399 bfd_put_32 (output_bfd,
3400 htab->sgotplt->output_section->vma
3401 + htab->sgotplt->output_offset,
3402 htab->splt->contents + 24);
3403 }
3404 elf_section_data (htab->splt->output_section)
3405 ->this_hdr.sh_entsize = 4;
3406 }
3407
3408 }
3409
3410 if (htab->sgotplt)
3411 {
3412 /* Fill in the first three entries in the global offset table. */
3413 if (htab->sgotplt->size > 0)
3414 {
3415 bfd_put_32 (output_bfd,
3416 (sdyn == NULL ? (bfd_vma) 0
3417 : sdyn->output_section->vma + sdyn->output_offset),
3418 htab->sgotplt->contents);
3419 /* One entry for shared object struct ptr. */
3420 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4);
3421 /* One entry for _dl_runtime_resolve. */
3422 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3423 }
3424
3425 elf_section_data (htab->sgotplt->output_section)
3426 ->this_hdr.sh_entsize = 4;
3427 }
3428 return TRUE;
3429 }
3430
3431 static bfd_boolean
3432 elf_s390_grok_prstatus (abfd, note)
3433 bfd * abfd;
3434 Elf_Internal_Note * note;
3435 {
3436 int offset;
3437 unsigned int size;
3438
3439 switch (note->descsz)
3440 {
3441 default:
3442 return FALSE;
3443
3444 case 224: /* S/390 Linux. */
3445 /* pr_cursig */
3446 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3447
3448 /* pr_pid */
3449 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 24);
3450
3451 /* pr_reg */
3452 offset = 72;
3453 size = 144;
3454 break;
3455 }
3456
3457 /* Make a ".reg/999" section. */
3458 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3459 size, note->descpos + offset);
3460 }
3461
3462 /* Return address for Ith PLT stub in section PLT, for relocation REL
3463 or (bfd_vma) -1 if it should not be included. */
3464
3465 static bfd_vma
3466 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3467 const arelent *rel ATTRIBUTE_UNUSED)
3468 {
3469 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3470 }
3471
3472 static bfd_boolean
3473 elf32_s390_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
3474 {
3475 elf_elfheader (obfd)->e_flags |= elf_elfheader (ibfd)->e_flags;
3476 return TRUE;
3477 }
3478
3479
3480 #define TARGET_BIG_SYM bfd_elf32_s390_vec
3481 #define TARGET_BIG_NAME "elf32-s390"
3482 #define ELF_ARCH bfd_arch_s390
3483 #define ELF_TARGET_ID S390_ELF_DATA
3484 #define ELF_MACHINE_CODE EM_S390
3485 #define ELF_MACHINE_ALT1 EM_S390_OLD
3486 #define ELF_MAXPAGESIZE 0x1000
3487
3488 #define elf_backend_can_gc_sections 1
3489 #define elf_backend_can_refcount 1
3490 #define elf_backend_want_got_plt 1
3491 #define elf_backend_plt_readonly 1
3492 #define elf_backend_want_plt_sym 0
3493 #define elf_backend_got_header_size 12
3494 #define elf_backend_rela_normal 1
3495
3496 #define elf_info_to_howto elf_s390_info_to_howto
3497
3498 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
3499 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
3500 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3501 #define bfd_elf32_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
3502
3503 #define bfd_elf32_bfd_merge_private_bfd_data elf32_s390_merge_private_bfd_data
3504
3505 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3506 #define elf_backend_check_relocs elf_s390_check_relocs
3507 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3508 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3509 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3510 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3511 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3512 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3513 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3514 #define elf_backend_relocate_section elf_s390_relocate_section
3515 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3516 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3517 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3518 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
3519 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3520
3521 #define bfd_elf32_mkobject elf_s390_mkobject
3522 #define elf_backend_object_p elf_s390_object_p
3523
3524 #include "elf32-target.h"
GDB Binutils - Deliverables
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