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* mn10300-tdep.c (mn10300_analyze_prologue): Implement backtrack
[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
3 Free Software Foundation, Inc.
4 Contributed by Carl B. Pedersen and Martin Schwidefsky.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23 #include "bfd.h"
24 #include "sysdep.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28
29 static reloc_howto_type *elf_s390_reloc_type_lookup
30 PARAMS ((bfd *, bfd_reloc_code_real_type));
31 static void elf_s390_info_to_howto
32 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
33 static bfd_boolean elf_s390_is_local_label_name
34 PARAMS ((bfd *, const char *));
35 static struct bfd_hash_entry *link_hash_newfunc
36 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
37 static struct bfd_link_hash_table *elf_s390_link_hash_table_create
38 PARAMS ((bfd *));
39 static bfd_boolean create_got_section
40 PARAMS((bfd *, struct bfd_link_info *));
41 static bfd_boolean elf_s390_create_dynamic_sections
42 PARAMS((bfd *, struct bfd_link_info *));
43 static void elf_s390_copy_indirect_symbol
44 PARAMS ((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 static asection *elf_s390_gc_mark_hook
50 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
51 struct elf_link_hash_entry *, Elf_Internal_Sym *));
52 static bfd_boolean elf_s390_gc_sweep_hook
53 PARAMS ((bfd *, struct bfd_link_info *, asection *,
54 const Elf_Internal_Rela *));
55 struct elf_s390_link_hash_entry;
56 static void elf_s390_adjust_gotplt
57 PARAMS ((struct elf_s390_link_hash_entry *));
58 static bfd_boolean elf_s390_adjust_dynamic_symbol
59 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
60 static bfd_boolean allocate_dynrelocs
61 PARAMS ((struct elf_link_hash_entry *, PTR));
62 static bfd_boolean readonly_dynrelocs
63 PARAMS ((struct elf_link_hash_entry *, PTR));
64 static bfd_boolean elf_s390_size_dynamic_sections
65 PARAMS ((bfd *, struct bfd_link_info *));
66 static bfd_boolean elf_s390_relocate_section
67 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
68 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
69 static bfd_boolean elf_s390_finish_dynamic_symbol
70 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
71 Elf_Internal_Sym *));
72 static enum elf_reloc_type_class elf_s390_reloc_type_class
73 PARAMS ((const Elf_Internal_Rela *));
74 static bfd_boolean elf_s390_finish_dynamic_sections
75 PARAMS ((bfd *, struct bfd_link_info *));
76 static bfd_boolean elf_s390_mkobject
77 PARAMS ((bfd *));
78 static bfd_boolean elf_s390_object_p
79 PARAMS ((bfd *));
80 static bfd_boolean elf_s390_grok_prstatus
81 PARAMS ((bfd *, Elf_Internal_Note *));
82 static int elf_s390_tls_transition
83 PARAMS ((struct bfd_link_info *, int, int));
84 static bfd_reloc_status_type s390_tls_reloc
85 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
86 static bfd_vma dtpoff_base
87 PARAMS ((struct bfd_link_info *));
88 static bfd_vma tpoff
89 PARAMS ((struct bfd_link_info *, bfd_vma));
90 static void invalid_tls_insn
91 PARAMS ((bfd *, asection *, Elf_Internal_Rela *));
92 static bfd_reloc_status_type s390_elf_ldisp_reloc
93 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
94
95 #include "elf/s390.h"
96
97 /* The relocation "howto" table. */
98
99 static reloc_howto_type elf_howto_table[] =
100 {
101 HOWTO (R_390_NONE, /* type */
102 0, /* rightshift */
103 0, /* size (0 = byte, 1 = short, 2 = long) */
104 0, /* bitsize */
105 FALSE, /* pc_relative */
106 0, /* bitpos */
107 complain_overflow_dont, /* complain_on_overflow */
108 bfd_elf_generic_reloc, /* special_function */
109 "R_390_NONE", /* name */
110 FALSE, /* partial_inplace */
111 0, /* src_mask */
112 0, /* dst_mask */
113 FALSE), /* pcrel_offset */
114
115 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
116 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
117 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
118 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
119 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
121 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
123 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
125 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
127 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
129 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
131 HOWTO(R_390_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,0xffffffff, FALSE),
133 HOWTO(R_390_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
134 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,0xffffffff, FALSE),
135 HOWTO(R_390_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
136 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,0xffffffff, FALSE),
137 HOWTO(R_390_RELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,0xffffffff, FALSE),
139 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
140 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,0xffffffff, FALSE),
141 HOWTO(R_390_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
142 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,0xffffffff, TRUE),
143 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
145 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
146 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
147 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
148 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
149 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
150 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
151 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
152 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
153 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
154 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
155 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
156 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,0xffffffff, TRUE),
157 EMPTY_HOWTO (R_390_64), /* Empty entry for R_390_64. */
158 EMPTY_HOWTO (R_390_PC64), /* Empty entry for R_390_PC64. */
159 EMPTY_HOWTO (R_390_GOT64), /* Empty entry for R_390_GOT64. */
160 EMPTY_HOWTO (R_390_PLT64), /* Empty entry for R_390_PLT64. */
161 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
162 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,0xffffffff, TRUE),
163 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
164 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
165 EMPTY_HOWTO (R_390_GOTOFF64), /* Empty entry for R_390_GOTOFF64. */
166 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
167 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
168 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
169 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
170 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
171 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
172 EMPTY_HOWTO (R_390_GOTPLT64), /* Empty entry for R_390_GOTPLT64. */
173 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
174 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,0xffffffff, TRUE),
175 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
176 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
177 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
178 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
179 EMPTY_HOWTO (R_390_PLTOFF64), /* Empty entry for R_390_PLTOFF64. */
180 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont,
181 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE),
182 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
183 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE),
184 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
185 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE),
186 HOWTO(R_390_TLS_GD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
187 bfd_elf_generic_reloc, "R_390_TLS_GD32", FALSE, 0, 0xffffffff, FALSE),
188 EMPTY_HOWTO (R_390_TLS_GD64), /* Empty entry for R_390_TLS_GD64. */
189 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
190 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE),
191 HOWTO(R_390_TLS_GOTIE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
192 bfd_elf_generic_reloc, "R_390_TLS_GOTIE32", FALSE, 0, 0xffffffff, FALSE),
193 EMPTY_HOWTO (R_390_TLS_GOTIE64), /* Empty entry for R_390_TLS_GOTIE64. */
194 HOWTO(R_390_TLS_LDM32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
195 bfd_elf_generic_reloc, "R_390_TLS_LDM32", FALSE, 0, 0xffffffff, FALSE),
196 EMPTY_HOWTO (R_390_TLS_LDM64), /* Empty entry for R_390_TLS_LDM64. */
197 HOWTO(R_390_TLS_IE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
198 bfd_elf_generic_reloc, "R_390_TLS_IE32", FALSE, 0, 0xffffffff, FALSE),
199 EMPTY_HOWTO (R_390_TLS_IE64), /* Empty entry for R_390_TLS_IE64. */
200 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
201 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, 0xffffffff, TRUE),
202 HOWTO(R_390_TLS_LE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
203 bfd_elf_generic_reloc, "R_390_TLS_LE32", FALSE, 0, 0xffffffff, FALSE),
204 EMPTY_HOWTO (R_390_TLS_LE64), /* Empty entry for R_390_TLS_LE64. */
205 HOWTO(R_390_TLS_LDO32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
206 bfd_elf_generic_reloc, "R_390_TLS_LDO32", FALSE, 0, 0xffffffff, FALSE),
207 EMPTY_HOWTO (R_390_TLS_LDO64), /* Empty entry for R_390_TLS_LDO64. */
208 HOWTO(R_390_TLS_DTPMOD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
209 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, 0xffffffff, FALSE),
210 HOWTO(R_390_TLS_DTPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
211 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, 0xffffffff, FALSE),
212 HOWTO(R_390_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
213 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, 0xffffffff, FALSE),
214 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
215 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE),
216 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
217 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE),
218 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
219 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE),
220 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
221 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE),
222 };
223
224 /* GNU extension to record C++ vtable hierarchy. */
225 static reloc_howto_type elf32_s390_vtinherit_howto =
226 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
227 static reloc_howto_type elf32_s390_vtentry_howto =
228 HOWTO (R_390_GNU_VTENTRY, 0,2,0,FALSE,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", FALSE,0,0, FALSE);
229
230 static reloc_howto_type *
231 elf_s390_reloc_type_lookup (abfd, code)
232 bfd *abfd ATTRIBUTE_UNUSED;
233 bfd_reloc_code_real_type code;
234 {
235 switch (code)
236 {
237 case BFD_RELOC_NONE:
238 return &elf_howto_table[(int) R_390_NONE];
239 case BFD_RELOC_8:
240 return &elf_howto_table[(int) R_390_8];
241 case BFD_RELOC_390_12:
242 return &elf_howto_table[(int) R_390_12];
243 case BFD_RELOC_16:
244 return &elf_howto_table[(int) R_390_16];
245 case BFD_RELOC_32:
246 return &elf_howto_table[(int) R_390_32];
247 case BFD_RELOC_CTOR:
248 return &elf_howto_table[(int) R_390_32];
249 case BFD_RELOC_32_PCREL:
250 return &elf_howto_table[(int) R_390_PC32];
251 case BFD_RELOC_390_GOT12:
252 return &elf_howto_table[(int) R_390_GOT12];
253 case BFD_RELOC_32_GOT_PCREL:
254 return &elf_howto_table[(int) R_390_GOT32];
255 case BFD_RELOC_390_PLT32:
256 return &elf_howto_table[(int) R_390_PLT32];
257 case BFD_RELOC_390_COPY:
258 return &elf_howto_table[(int) R_390_COPY];
259 case BFD_RELOC_390_GLOB_DAT:
260 return &elf_howto_table[(int) R_390_GLOB_DAT];
261 case BFD_RELOC_390_JMP_SLOT:
262 return &elf_howto_table[(int) R_390_JMP_SLOT];
263 case BFD_RELOC_390_RELATIVE:
264 return &elf_howto_table[(int) R_390_RELATIVE];
265 case BFD_RELOC_32_GOTOFF:
266 return &elf_howto_table[(int) R_390_GOTOFF32];
267 case BFD_RELOC_390_GOTPC:
268 return &elf_howto_table[(int) R_390_GOTPC];
269 case BFD_RELOC_390_GOT16:
270 return &elf_howto_table[(int) R_390_GOT16];
271 case BFD_RELOC_16_PCREL:
272 return &elf_howto_table[(int) R_390_PC16];
273 case BFD_RELOC_390_PC16DBL:
274 return &elf_howto_table[(int) R_390_PC16DBL];
275 case BFD_RELOC_390_PLT16DBL:
276 return &elf_howto_table[(int) R_390_PLT16DBL];
277 case BFD_RELOC_390_PC32DBL:
278 return &elf_howto_table[(int) R_390_PC32DBL];
279 case BFD_RELOC_390_PLT32DBL:
280 return &elf_howto_table[(int) R_390_PLT32DBL];
281 case BFD_RELOC_390_GOTPCDBL:
282 return &elf_howto_table[(int) R_390_GOTPCDBL];
283 case BFD_RELOC_390_GOTENT:
284 return &elf_howto_table[(int) R_390_GOTENT];
285 case BFD_RELOC_16_GOTOFF:
286 return &elf_howto_table[(int) R_390_GOTOFF16];
287 case BFD_RELOC_390_GOTPLT12:
288 return &elf_howto_table[(int) R_390_GOTPLT12];
289 case BFD_RELOC_390_GOTPLT16:
290 return &elf_howto_table[(int) R_390_GOTPLT16];
291 case BFD_RELOC_390_GOTPLT32:
292 return &elf_howto_table[(int) R_390_GOTPLT32];
293 case BFD_RELOC_390_GOTPLTENT:
294 return &elf_howto_table[(int) R_390_GOTPLTENT];
295 case BFD_RELOC_390_PLTOFF16:
296 return &elf_howto_table[(int) R_390_PLTOFF16];
297 case BFD_RELOC_390_PLTOFF32:
298 return &elf_howto_table[(int) R_390_PLTOFF32];
299 case BFD_RELOC_390_TLS_LOAD:
300 return &elf_howto_table[(int) R_390_TLS_LOAD];
301 case BFD_RELOC_390_TLS_GDCALL:
302 return &elf_howto_table[(int) R_390_TLS_GDCALL];
303 case BFD_RELOC_390_TLS_LDCALL:
304 return &elf_howto_table[(int) R_390_TLS_LDCALL];
305 case BFD_RELOC_390_TLS_GD32:
306 return &elf_howto_table[(int) R_390_TLS_GD32];
307 case BFD_RELOC_390_TLS_GOTIE12:
308 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
309 case BFD_RELOC_390_TLS_GOTIE32:
310 return &elf_howto_table[(int) R_390_TLS_GOTIE32];
311 case BFD_RELOC_390_TLS_LDM32:
312 return &elf_howto_table[(int) R_390_TLS_LDM32];
313 case BFD_RELOC_390_TLS_IE32:
314 return &elf_howto_table[(int) R_390_TLS_IE32];
315 case BFD_RELOC_390_TLS_IEENT:
316 return &elf_howto_table[(int) R_390_TLS_IEENT];
317 case BFD_RELOC_390_TLS_LE32:
318 return &elf_howto_table[(int) R_390_TLS_LE32];
319 case BFD_RELOC_390_TLS_LDO32:
320 return &elf_howto_table[(int) R_390_TLS_LDO32];
321 case BFD_RELOC_390_TLS_DTPMOD:
322 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
323 case BFD_RELOC_390_TLS_DTPOFF:
324 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
325 case BFD_RELOC_390_TLS_TPOFF:
326 return &elf_howto_table[(int) R_390_TLS_TPOFF];
327 case BFD_RELOC_390_20:
328 return &elf_howto_table[(int) R_390_20];
329 case BFD_RELOC_390_GOT20:
330 return &elf_howto_table[(int) R_390_GOT20];
331 case BFD_RELOC_390_GOTPLT20:
332 return &elf_howto_table[(int) R_390_GOTPLT20];
333 case BFD_RELOC_390_TLS_GOTIE20:
334 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
335 case BFD_RELOC_VTABLE_INHERIT:
336 return &elf32_s390_vtinherit_howto;
337 case BFD_RELOC_VTABLE_ENTRY:
338 return &elf32_s390_vtentry_howto;
339 default:
340 break;
341 }
342 return 0;
343 }
344
345 /* We need to use ELF32_R_TYPE so we have our own copy of this function,
346 and elf32-s390.c has its own copy. */
347
348 static void
349 elf_s390_info_to_howto (abfd, cache_ptr, dst)
350 bfd *abfd ATTRIBUTE_UNUSED;
351 arelent *cache_ptr;
352 Elf_Internal_Rela *dst;
353 {
354 unsigned int r_type = ELF32_R_TYPE(dst->r_info);
355 switch (r_type)
356 {
357 case R_390_GNU_VTINHERIT:
358 cache_ptr->howto = &elf32_s390_vtinherit_howto;
359 break;
360
361 case R_390_GNU_VTENTRY:
362 cache_ptr->howto = &elf32_s390_vtentry_howto;
363 break;
364
365 default:
366 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
367 {
368 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
369 abfd, (int) r_type);
370 r_type = R_390_NONE;
371 }
372 cache_ptr->howto = &elf_howto_table[r_type];
373 }
374 }
375
376 /* A relocation function which doesn't do anything. */
377 static bfd_reloc_status_type
378 s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section,
379 output_bfd, error_message)
380 bfd *abfd ATTRIBUTE_UNUSED;
381 arelent *reloc_entry;
382 asymbol *symbol ATTRIBUTE_UNUSED;
383 PTR data ATTRIBUTE_UNUSED;
384 asection *input_section;
385 bfd *output_bfd;
386 char **error_message ATTRIBUTE_UNUSED;
387 {
388 if (output_bfd)
389 reloc_entry->address += input_section->output_offset;
390 return bfd_reloc_ok;
391 }
392
393 /* Handle the large displacement relocs. */
394 static bfd_reloc_status_type
395 s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section,
396 output_bfd, error_message)
397 bfd *abfd ATTRIBUTE_UNUSED;
398 arelent *reloc_entry;
399 asymbol *symbol;
400 PTR data ATTRIBUTE_UNUSED;
401 asection *input_section;
402 bfd *output_bfd;
403 char **error_message ATTRIBUTE_UNUSED;
404 {
405 reloc_howto_type *howto = reloc_entry->howto;
406 bfd_vma relocation;
407 bfd_vma insn;
408
409 if (output_bfd != (bfd *) NULL
410 && (symbol->flags & BSF_SECTION_SYM) == 0
411 && (! howto->partial_inplace
412 || reloc_entry->addend == 0))
413 {
414 reloc_entry->address += input_section->output_offset;
415 return bfd_reloc_ok;
416 }
417
418 if (output_bfd != NULL)
419 return bfd_reloc_continue;
420
421 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
422 return bfd_reloc_outofrange;
423
424 relocation = (symbol->value
425 + symbol->section->output_section->vma
426 + symbol->section->output_offset);
427 relocation += reloc_entry->addend;
428 if (howto->pc_relative)
429 {
430 relocation -= (input_section->output_section->vma
431 + input_section->output_offset);
432 relocation -= reloc_entry->address;
433 }
434
435 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
436 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
437 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
438
439 if ((bfd_signed_vma) relocation < - 0x80000
440 || (bfd_signed_vma) relocation > 0x7ffff)
441 return bfd_reloc_overflow;
442 else
443 return bfd_reloc_ok;
444 }
445
446 static bfd_boolean
447 elf_s390_is_local_label_name (abfd, name)
448 bfd *abfd;
449 const char *name;
450 {
451 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
452 return TRUE;
453
454 return _bfd_elf_is_local_label_name (abfd, name);
455 }
456
457 /* Functions for the 390 ELF linker. */
458
459 /* The name of the dynamic interpreter. This is put in the .interp
460 section. */
461
462 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
463
464 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
465 copying dynamic variables from a shared lib into an app's dynbss
466 section, and instead use a dynamic relocation to point into the
467 shared lib. */
468 #define ELIMINATE_COPY_RELOCS 1
469
470 /* The size in bytes of the first entry in the procedure linkage table. */
471 #define PLT_FIRST_ENTRY_SIZE 32
472 /* The size in bytes of an entry in the procedure linkage table. */
473 #define PLT_ENTRY_SIZE 32
474
475 #define GOT_ENTRY_SIZE 4
476
477 /* The first three entries in a procedure linkage table are reserved,
478 and the initial contents are unimportant (we zero them out).
479 Subsequent entries look like this. See the SVR4 ABI 386
480 supplement to see how this works. */
481
482 /* For the s390, simple addr offset can only be 0 - 4096.
483 To use the full 2 GB address space, several instructions
484 are needed to load an address in a register and execute
485 a branch( or just saving the address)
486
487 Furthermore, only r 0 and 1 are free to use!!! */
488
489 /* The first 3 words in the GOT are then reserved.
490 Word 0 is the address of the dynamic table.
491 Word 1 is a pointer to a structure describing the object
492 Word 2 is used to point to the loader entry address.
493
494 The code for position independent PLT entries looks like this:
495
496 r12 holds addr of the current GOT at entry to the PLT
497
498 The GOT holds the address in the PLT to be executed.
499 The loader then gets:
500 24(15) = Pointer to the structure describing the object.
501 28(15) = Offset in symbol table
502
503 The loader must then find the module where the function is
504 and insert the address in the GOT.
505
506 Note: 390 can only address +- 64 K relative.
507 We check if offset > 65536, then make a relative branch -64xxx
508 back to a previous defined branch
509
510 PLT1: BASR 1,0 # 2 bytes
511 L 1,22(1) # 4 bytes Load offset in GOT in r 1
512 L 1,(1,12) # 4 bytes Load address from GOT in r1
513 BCR 15,1 # 2 bytes Jump to address
514 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
515 L 1,14(1) # 4 bytes Load offset in symol table in r1
516 BRC 15,-x # 4 bytes Jump to start of PLT
517 .word 0 # 2 bytes filler
518 .long ? # 4 bytes offset in GOT
519 .long ? # 4 bytes offset into symbol table
520
521 This was the general case. There are two additional, optimizes PLT
522 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768.
523 First the one for GOT offsets < 4096:
524
525 PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1
526 BCR 15,1 # 2 bytes Jump to address
527 .word 0,0,0 # 6 bytes filler
528 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
529 L 1,14(1) # 4 bytes Load offset in symbol table in r1
530 BRC 15,-x # 4 bytes Jump to start of PLT
531 .word 0,0,0 # 6 bytes filler
532 .long ? # 4 bytes offset into symbol table
533
534 Second the one for GOT offsets < 32768:
535
536 PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1
537 L 1,(1,12) # 4 bytes Load address from GOT to r1
538 BCR 15,1 # 2 bytes Jump to address
539 .word 0 # 2 bytes filler
540 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
541 L 1,14(1) # 4 bytes Load offset in symbol table in r1
542 BRC 15,-x # 4 bytes Jump to start of PLT
543 .word 0,0,0 # 6 bytes filler
544 .long ? # 4 bytes offset into symbol table
545
546 Total = 32 bytes per PLT entry
547
548 The code for static build PLT entries looks like this:
549
550 PLT1: BASR 1,0 # 2 bytes
551 L 1,22(1) # 4 bytes Load address of GOT entry
552 L 1,0(0,1) # 4 bytes Load address from GOT in r1
553 BCR 15,1 # 2 bytes Jump to address
554 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
555 L 1,14(1) # 4 bytes Load offset in symbol table in r1
556 BRC 15,-x # 4 bytes Jump to start of PLT
557 .word 0 # 2 bytes filler
558 .long ? # 4 bytes address of GOT entry
559 .long ? # 4 bytes offset into symbol table */
560
561 #define PLT_PIC_ENTRY_WORD0 0x0d105810
562 #define PLT_PIC_ENTRY_WORD1 0x10165811
563 #define PLT_PIC_ENTRY_WORD2 0xc00007f1
564 #define PLT_PIC_ENTRY_WORD3 0x0d105810
565 #define PLT_PIC_ENTRY_WORD4 0x100ea7f4
566
567 #define PLT_PIC12_ENTRY_WORD0 0x5810c000
568 #define PLT_PIC12_ENTRY_WORD1 0x07f10000
569 #define PLT_PIC12_ENTRY_WORD2 0x00000000
570 #define PLT_PIC12_ENTRY_WORD3 0x0d105810
571 #define PLT_PIC12_ENTRY_WORD4 0x100ea7f4
572
573 #define PLT_PIC16_ENTRY_WORD0 0xa7180000
574 #define PLT_PIC16_ENTRY_WORD1 0x5811c000
575 #define PLT_PIC16_ENTRY_WORD2 0x07f10000
576 #define PLT_PIC16_ENTRY_WORD3 0x0d105810
577 #define PLT_PIC16_ENTRY_WORD4 0x100ea7f4
578
579 #define PLT_ENTRY_WORD0 0x0d105810
580 #define PLT_ENTRY_WORD1 0x10165810
581 #define PLT_ENTRY_WORD2 0x100007f1
582 #define PLT_ENTRY_WORD3 0x0d105810
583 #define PLT_ENTRY_WORD4 0x100ea7f4
584
585 /* The first PLT entry pushes the offset into the symbol table
586 from R1 onto the stack at 8(15) and the loader object info
587 at 12(15), loads the loader address in R1 and jumps to it. */
588
589 /* The first entry in the PLT for PIC code:
590
591 PLT0:
592 ST 1,28(15) # R1 has offset into symbol table
593 L 1,4(12) # Get loader ino(object struct address)
594 ST 1,24(15) # Store address
595 L 1,8(12) # Entry address of loader in R1
596 BR 1 # Jump to loader
597
598 The first entry in the PLT for static code:
599
600 PLT0:
601 ST 1,28(15) # R1 has offset into symbol table
602 BASR 1,0
603 L 1,18(0,1) # Get address of GOT
604 MVC 24(4,15),4(1) # Move loader ino to stack
605 L 1,8(1) # Get address of loader
606 BR 1 # Jump to loader
607 .word 0 # filler
608 .long got # address of GOT */
609
610 #define PLT_PIC_FIRST_ENTRY_WORD0 0x5010f01c
611 #define PLT_PIC_FIRST_ENTRY_WORD1 0x5810c004
612 #define PLT_PIC_FIRST_ENTRY_WORD2 0x5010f018
613 #define PLT_PIC_FIRST_ENTRY_WORD3 0x5810c008
614 #define PLT_PIC_FIRST_ENTRY_WORD4 0x07f10000
615
616 #define PLT_FIRST_ENTRY_WORD0 0x5010f01c
617 #define PLT_FIRST_ENTRY_WORD1 0x0d105810
618 #define PLT_FIRST_ENTRY_WORD2 0x1012D203
619 #define PLT_FIRST_ENTRY_WORD3 0xf0181004
620 #define PLT_FIRST_ENTRY_WORD4 0x58101008
621 #define PLT_FIRST_ENTRY_WORD5 0x07f10000
622
623 /* The s390 linker needs to keep track of the number of relocs that it
624 decides to copy as dynamic relocs in check_relocs for each symbol.
625 This is so that it can later discard them if they are found to be
626 unnecessary. We store the information in a field extending the
627 regular ELF linker hash table. */
628
629 struct elf_s390_dyn_relocs
630 {
631 struct elf_s390_dyn_relocs *next;
632
633 /* The input section of the reloc. */
634 asection *sec;
635
636 /* Total number of relocs copied for the input section. */
637 bfd_size_type count;
638
639 /* Number of pc-relative relocs copied for the input section. */
640 bfd_size_type pc_count;
641 };
642
643 /* s390 ELF linker hash entry. */
644
645 struct elf_s390_link_hash_entry
646 {
647 struct elf_link_hash_entry elf;
648
649 /* Track dynamic relocs copied for this symbol. */
650 struct elf_s390_dyn_relocs *dyn_relocs;
651
652 /* Number of GOTPLT references for a function. */
653 bfd_signed_vma gotplt_refcount;
654
655 #define GOT_UNKNOWN 0
656 #define GOT_NORMAL 1
657 #define GOT_TLS_GD 2
658 #define GOT_TLS_IE 3
659 #define GOT_TLS_IE_NLT 4
660 unsigned char tls_type;
661 };
662
663 #define elf_s390_hash_entry(ent) \
664 ((struct elf_s390_link_hash_entry *)(ent))
665
666 struct elf_s390_obj_tdata
667 {
668 struct elf_obj_tdata root;
669
670 /* tls_type for each local got entry. */
671 char *local_got_tls_type;
672 };
673
674 #define elf_s390_tdata(abfd) \
675 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
676
677 #define elf_s390_local_got_tls_type(abfd) \
678 (elf_s390_tdata (abfd)->local_got_tls_type)
679
680 static bfd_boolean
681 elf_s390_mkobject (abfd)
682 bfd *abfd;
683 {
684 bfd_size_type amt = sizeof (struct elf_s390_obj_tdata);
685 abfd->tdata.any = bfd_zalloc (abfd, amt);
686 if (abfd->tdata.any == NULL)
687 return FALSE;
688 return TRUE;
689 }
690
691 static bfd_boolean
692 elf_s390_object_p (abfd)
693 bfd *abfd;
694 {
695 /* Set the right machine number for an s390 elf32 file. */
696 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31);
697 }
698
699 /* s390 ELF linker hash table. */
700
701 struct elf_s390_link_hash_table
702 {
703 struct elf_link_hash_table elf;
704
705 /* Short-cuts to get to dynamic linker sections. */
706 asection *sgot;
707 asection *sgotplt;
708 asection *srelgot;
709 asection *splt;
710 asection *srelplt;
711 asection *sdynbss;
712 asection *srelbss;
713
714 union {
715 bfd_signed_vma refcount;
716 bfd_vma offset;
717 } tls_ldm_got;
718
719 /* Small local sym to section mapping cache. */
720 struct sym_sec_cache sym_sec;
721 };
722
723 /* Get the s390 ELF linker hash table from a link_info structure. */
724
725 #define elf_s390_hash_table(p) \
726 ((struct elf_s390_link_hash_table *) ((p)->hash))
727
728 /* Create an entry in an s390 ELF linker hash table. */
729
730 static struct bfd_hash_entry *
731 link_hash_newfunc (entry, table, string)
732 struct bfd_hash_entry *entry;
733 struct bfd_hash_table *table;
734 const char *string;
735 {
736 /* Allocate the structure if it has not already been allocated by a
737 subclass. */
738 if (entry == NULL)
739 {
740 entry = bfd_hash_allocate (table,
741 sizeof (struct elf_s390_link_hash_entry));
742 if (entry == NULL)
743 return entry;
744 }
745
746 /* Call the allocation method of the superclass. */
747 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
748 if (entry != NULL)
749 {
750 struct elf_s390_link_hash_entry *eh;
751
752 eh = (struct elf_s390_link_hash_entry *) entry;
753 eh->dyn_relocs = NULL;
754 eh->gotplt_refcount = 0;
755 eh->tls_type = GOT_UNKNOWN;
756 }
757
758 return entry;
759 }
760
761 /* Create an s390 ELF linker hash table. */
762
763 static struct bfd_link_hash_table *
764 elf_s390_link_hash_table_create (abfd)
765 bfd *abfd;
766 {
767 struct elf_s390_link_hash_table *ret;
768 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
769
770 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
771 if (ret == NULL)
772 return NULL;
773
774 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
775 {
776 free (ret);
777 return NULL;
778 }
779
780 ret->sgot = NULL;
781 ret->sgotplt = NULL;
782 ret->srelgot = NULL;
783 ret->splt = NULL;
784 ret->srelplt = NULL;
785 ret->sdynbss = NULL;
786 ret->srelbss = NULL;
787 ret->tls_ldm_got.refcount = 0;
788 ret->sym_sec.abfd = NULL;
789
790 return &ret->elf.root;
791 }
792
793 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
794 shortcuts to them in our hash table. */
795
796 static bfd_boolean
797 create_got_section (dynobj, info)
798 bfd *dynobj;
799 struct bfd_link_info *info;
800 {
801 struct elf_s390_link_hash_table *htab;
802
803 if (! _bfd_elf_create_got_section (dynobj, info))
804 return FALSE;
805
806 htab = elf_s390_hash_table (info);
807 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
808 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
809 if (!htab->sgot || !htab->sgotplt)
810 abort ();
811
812 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got",
813 (SEC_ALLOC | SEC_LOAD
814 | SEC_HAS_CONTENTS
815 | SEC_IN_MEMORY
816 | SEC_LINKER_CREATED
817 | SEC_READONLY));
818 if (htab->srelgot == NULL
819 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
820 return FALSE;
821 return TRUE;
822 }
823
824 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
825 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
826 hash table. */
827
828 static bfd_boolean
829 elf_s390_create_dynamic_sections (dynobj, info)
830 bfd *dynobj;
831 struct bfd_link_info *info;
832 {
833 struct elf_s390_link_hash_table *htab;
834
835 htab = elf_s390_hash_table (info);
836 if (!htab->sgot && !create_got_section (dynobj, info))
837 return FALSE;
838
839 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
840 return FALSE;
841
842 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
843 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
844 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
845 if (!info->shared)
846 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
847
848 if (!htab->splt || !htab->srelplt || !htab->sdynbss
849 || (!info->shared && !htab->srelbss))
850 abort ();
851
852 return TRUE;
853 }
854
855 /* Copy the extra info we tack onto an elf_link_hash_entry. */
856
857 static void
858 elf_s390_copy_indirect_symbol (info, dir, ind)
859 struct bfd_link_info *info;
860 struct elf_link_hash_entry *dir, *ind;
861 {
862 struct elf_s390_link_hash_entry *edir, *eind;
863
864 edir = (struct elf_s390_link_hash_entry *) dir;
865 eind = (struct elf_s390_link_hash_entry *) ind;
866
867 if (eind->dyn_relocs != NULL)
868 {
869 if (edir->dyn_relocs != NULL)
870 {
871 struct elf_s390_dyn_relocs **pp;
872 struct elf_s390_dyn_relocs *p;
873
874 /* Add reloc counts against the indirect sym to the direct sym
875 list. Merge any entries against the same section. */
876 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
877 {
878 struct elf_s390_dyn_relocs *q;
879
880 for (q = edir->dyn_relocs; q != NULL; q = q->next)
881 if (q->sec == p->sec)
882 {
883 q->pc_count += p->pc_count;
884 q->count += p->count;
885 *pp = p->next;
886 break;
887 }
888 if (q == NULL)
889 pp = &p->next;
890 }
891 *pp = edir->dyn_relocs;
892 }
893
894 edir->dyn_relocs = eind->dyn_relocs;
895 eind->dyn_relocs = NULL;
896 }
897
898 if (ind->root.type == bfd_link_hash_indirect
899 && dir->got.refcount <= 0)
900 {
901 edir->tls_type = eind->tls_type;
902 eind->tls_type = GOT_UNKNOWN;
903 }
904
905 if (ELIMINATE_COPY_RELOCS
906 && ind->root.type != bfd_link_hash_indirect
907 && dir->dynamic_adjusted)
908 {
909 /* If called to transfer flags for a weakdef during processing
910 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
911 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
912 dir->ref_dynamic |= ind->ref_dynamic;
913 dir->ref_regular |= ind->ref_regular;
914 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
915 dir->needs_plt |= ind->needs_plt;
916 }
917 else
918 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
919 }
920
921 static int
922 elf_s390_tls_transition (info, r_type, is_local)
923 struct bfd_link_info *info;
924 int r_type;
925 int is_local;
926 {
927 if (info->shared)
928 return r_type;
929
930 switch (r_type)
931 {
932 case R_390_TLS_GD32:
933 case R_390_TLS_IE32:
934 if (is_local)
935 return R_390_TLS_LE32;
936 return R_390_TLS_IE32;
937 case R_390_TLS_GOTIE32:
938 if (is_local)
939 return R_390_TLS_LE32;
940 return R_390_TLS_GOTIE32;
941 case R_390_TLS_LDM32:
942 return R_390_TLS_LE32;
943 }
944
945 return r_type;
946 }
947
948 /* Look through the relocs for a section during the first phase, and
949 allocate space in the global offset table or procedure linkage
950 table. */
951
952 static bfd_boolean
953 elf_s390_check_relocs (abfd, info, sec, relocs)
954 bfd *abfd;
955 struct bfd_link_info *info;
956 asection *sec;
957 const Elf_Internal_Rela *relocs;
958 {
959 struct elf_s390_link_hash_table *htab;
960 Elf_Internal_Shdr *symtab_hdr;
961 struct elf_link_hash_entry **sym_hashes;
962 const Elf_Internal_Rela *rel;
963 const Elf_Internal_Rela *rel_end;
964 asection *sreloc;
965 bfd_signed_vma *local_got_refcounts;
966 int tls_type, old_tls_type;
967
968 if (info->relocatable)
969 return TRUE;
970
971 htab = elf_s390_hash_table (info);
972 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
973 sym_hashes = elf_sym_hashes (abfd);
974 local_got_refcounts = elf_local_got_refcounts (abfd);
975
976 sreloc = NULL;
977
978 rel_end = relocs + sec->reloc_count;
979 for (rel = relocs; rel < rel_end; rel++)
980 {
981 unsigned int r_type;
982 unsigned long r_symndx;
983 struct elf_link_hash_entry *h;
984
985 r_symndx = ELF32_R_SYM (rel->r_info);
986
987 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
988 {
989 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
990 abfd, r_symndx);
991 return FALSE;
992 }
993
994 if (r_symndx < symtab_hdr->sh_info)
995 h = NULL;
996 else
997 {
998 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
999 while (h->root.type == bfd_link_hash_indirect
1000 || h->root.type == bfd_link_hash_warning)
1001 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1002 }
1003
1004 /* Create got section and local_got_refcounts array if they
1005 are needed. */
1006 r_type = elf_s390_tls_transition (info,
1007 ELF32_R_TYPE (rel->r_info),
1008 h == NULL);
1009 switch (r_type)
1010 {
1011 case R_390_GOT12:
1012 case R_390_GOT16:
1013 case R_390_GOT20:
1014 case R_390_GOT32:
1015 case R_390_GOTENT:
1016 case R_390_GOTPLT12:
1017 case R_390_GOTPLT16:
1018 case R_390_GOTPLT20:
1019 case R_390_GOTPLT32:
1020 case R_390_GOTPLTENT:
1021 case R_390_TLS_GD32:
1022 case R_390_TLS_GOTIE12:
1023 case R_390_TLS_GOTIE20:
1024 case R_390_TLS_GOTIE32:
1025 case R_390_TLS_IEENT:
1026 case R_390_TLS_IE32:
1027 case R_390_TLS_LDM32:
1028 if (h == NULL
1029 && local_got_refcounts == NULL)
1030 {
1031 bfd_size_type size;
1032
1033 size = symtab_hdr->sh_info;
1034 size *= (sizeof (bfd_signed_vma) + sizeof(char));
1035 local_got_refcounts = ((bfd_signed_vma *)
1036 bfd_zalloc (abfd, size));
1037 if (local_got_refcounts == NULL)
1038 return FALSE;
1039 elf_local_got_refcounts (abfd) = local_got_refcounts;
1040 elf_s390_local_got_tls_type (abfd)
1041 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1042 }
1043 /* Fall through. */
1044 case R_390_GOTOFF16:
1045 case R_390_GOTOFF32:
1046 case R_390_GOTPC:
1047 case R_390_GOTPCDBL:
1048 if (htab->sgot == NULL)
1049 {
1050 if (htab->elf.dynobj == NULL)
1051 htab->elf.dynobj = abfd;
1052 if (!create_got_section (htab->elf.dynobj, info))
1053 return FALSE;
1054 }
1055 }
1056
1057 switch (r_type)
1058 {
1059 case R_390_GOTOFF16:
1060 case R_390_GOTOFF32:
1061 case R_390_GOTPC:
1062 case R_390_GOTPCDBL:
1063 /* Got is created, nothing to be done. */
1064 break;
1065
1066 case R_390_PLT16DBL:
1067 case R_390_PLT32DBL:
1068 case R_390_PLT32:
1069 case R_390_PLTOFF16:
1070 case R_390_PLTOFF32:
1071 /* This symbol requires a procedure linkage table entry. We
1072 actually build the entry in adjust_dynamic_symbol,
1073 because this might be a case of linking PIC code which is
1074 never referenced by a dynamic object, in which case we
1075 don't need to generate a procedure linkage table entry
1076 after all. */
1077
1078 /* If this is a local symbol, we resolve it directly without
1079 creating a procedure linkage table entry. */
1080 if (h != NULL)
1081 {
1082 h->needs_plt = 1;
1083 h->plt.refcount += 1;
1084 }
1085 break;
1086
1087 case R_390_GOTPLT12:
1088 case R_390_GOTPLT16:
1089 case R_390_GOTPLT20:
1090 case R_390_GOTPLT32:
1091 case R_390_GOTPLTENT:
1092 /* This symbol requires either a procedure linkage table entry
1093 or an entry in the local got. We actually build the entry
1094 in adjust_dynamic_symbol because whether this is really a
1095 global reference can change and with it the fact if we have
1096 to create a plt entry or a local got entry. To be able to
1097 make a once global symbol a local one we have to keep track
1098 of the number of gotplt references that exist for this
1099 symbol. */
1100 if (h != NULL)
1101 {
1102 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1103 h->needs_plt = 1;
1104 h->plt.refcount += 1;
1105 }
1106 else
1107 local_got_refcounts[r_symndx] += 1;
1108 break;
1109
1110 case R_390_TLS_LDM32:
1111 htab->tls_ldm_got.refcount += 1;
1112 break;
1113
1114 case R_390_TLS_IE32:
1115 case R_390_TLS_GOTIE12:
1116 case R_390_TLS_GOTIE20:
1117 case R_390_TLS_GOTIE32:
1118 case R_390_TLS_IEENT:
1119 if (info->shared)
1120 info->flags |= DF_STATIC_TLS;
1121 /* Fall through. */
1122
1123 case R_390_GOT12:
1124 case R_390_GOT16:
1125 case R_390_GOT20:
1126 case R_390_GOT32:
1127 case R_390_GOTENT:
1128 case R_390_TLS_GD32:
1129 /* This symbol requires a global offset table entry. */
1130 switch (r_type)
1131 {
1132 default:
1133 case R_390_GOT12:
1134 case R_390_GOT16:
1135 case R_390_GOT20:
1136 case R_390_GOT32:
1137 case R_390_GOTENT:
1138 tls_type = GOT_NORMAL;
1139 break;
1140 case R_390_TLS_GD32:
1141 tls_type = GOT_TLS_GD;
1142 break;
1143 case R_390_TLS_IE32:
1144 case R_390_TLS_GOTIE32:
1145 tls_type = GOT_TLS_IE;
1146 break;
1147 case R_390_TLS_GOTIE12:
1148 case R_390_TLS_GOTIE20:
1149 case R_390_TLS_IEENT:
1150 tls_type = GOT_TLS_IE_NLT;
1151 break;
1152 }
1153
1154 if (h != NULL)
1155 {
1156 h->got.refcount += 1;
1157 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1158 }
1159 else
1160 {
1161 local_got_refcounts[r_symndx] += 1;
1162 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1163 }
1164 /* If a TLS symbol is accessed using IE at least once,
1165 there is no point to use dynamic model for it. */
1166 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1167 {
1168 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1169 {
1170 (*_bfd_error_handler)
1171 (_("%B: `%s' accessed both as normal and thread local symbol"),
1172 abfd, h->root.root.string);
1173 return FALSE;
1174 }
1175 if (old_tls_type > tls_type)
1176 tls_type = old_tls_type;
1177 }
1178
1179 if (old_tls_type != tls_type)
1180 {
1181 if (h != NULL)
1182 elf_s390_hash_entry (h)->tls_type = tls_type;
1183 else
1184 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1185 }
1186
1187 if (r_type != R_390_TLS_IE32)
1188 break;
1189 /* Fall through. */
1190
1191 case R_390_TLS_LE32:
1192 if (!info->shared)
1193 break;
1194 info->flags |= DF_STATIC_TLS;
1195 /* Fall through. */
1196
1197 case R_390_8:
1198 case R_390_16:
1199 case R_390_32:
1200 case R_390_PC16:
1201 case R_390_PC16DBL:
1202 case R_390_PC32DBL:
1203 case R_390_PC32:
1204 if (h != NULL && !info->shared)
1205 {
1206 /* If this reloc is in a read-only section, we might
1207 need a copy reloc. We can't check reliably at this
1208 stage whether the section is read-only, as input
1209 sections have not yet been mapped to output sections.
1210 Tentatively set the flag for now, and correct in
1211 adjust_dynamic_symbol. */
1212 h->non_got_ref = 1;
1213
1214 /* We may need a .plt entry if the function this reloc
1215 refers to is in a shared lib. */
1216 h->plt.refcount += 1;
1217 }
1218
1219 /* If we are creating a shared library, and this is a reloc
1220 against a global symbol, or a non PC relative reloc
1221 against a local symbol, then we need to copy the reloc
1222 into the shared library. However, if we are linking with
1223 -Bsymbolic, we do not need to copy a reloc against a
1224 global symbol which is defined in an object we are
1225 including in the link (i.e., DEF_REGULAR is set). At
1226 this point we have not seen all the input files, so it is
1227 possible that DEF_REGULAR is not set now but will be set
1228 later (it is never cleared). In case of a weak definition,
1229 DEF_REGULAR may be cleared later by a strong definition in
1230 a shared library. We account for that possibility below by
1231 storing information in the relocs_copied field of the hash
1232 table entry. A similar situation occurs when creating
1233 shared libraries and symbol visibility changes render the
1234 symbol local.
1235
1236 If on the other hand, we are creating an executable, we
1237 may need to keep relocations for symbols satisfied by a
1238 dynamic library if we manage to avoid copy relocs for the
1239 symbol. */
1240 if ((info->shared
1241 && (sec->flags & SEC_ALLOC) != 0
1242 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16
1243 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL
1244 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL
1245 && ELF32_R_TYPE (rel->r_info) != R_390_PC32)
1246 || (h != NULL
1247 && (! info->symbolic
1248 || h->root.type == bfd_link_hash_defweak
1249 || !h->def_regular))))
1250 || (ELIMINATE_COPY_RELOCS
1251 && !info->shared
1252 && (sec->flags & SEC_ALLOC) != 0
1253 && h != NULL
1254 && (h->root.type == bfd_link_hash_defweak
1255 || !h->def_regular)))
1256 {
1257 struct elf_s390_dyn_relocs *p;
1258 struct elf_s390_dyn_relocs **head;
1259
1260 /* We must copy these reloc types into the output file.
1261 Create a reloc section in dynobj and make room for
1262 this reloc. */
1263 if (sreloc == NULL)
1264 {
1265 const char *name;
1266 bfd *dynobj;
1267
1268 name = (bfd_elf_string_from_elf_section
1269 (abfd,
1270 elf_elfheader (abfd)->e_shstrndx,
1271 elf_section_data (sec)->rel_hdr.sh_name));
1272 if (name == NULL)
1273 return FALSE;
1274
1275 if (strncmp (name, ".rela", 5) != 0
1276 || strcmp (bfd_get_section_name (abfd, sec),
1277 name + 5) != 0)
1278 {
1279 (*_bfd_error_handler)
1280 (_("%B: bad relocation section name `%s\'"),
1281 abfd, name);
1282 }
1283
1284 if (htab->elf.dynobj == NULL)
1285 htab->elf.dynobj = abfd;
1286
1287 dynobj = htab->elf.dynobj;
1288 sreloc = bfd_get_section_by_name (dynobj, name);
1289 if (sreloc == NULL)
1290 {
1291 flagword flags;
1292
1293 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1294 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1295 if ((sec->flags & SEC_ALLOC) != 0)
1296 flags |= SEC_ALLOC | SEC_LOAD;
1297 sreloc = bfd_make_section_with_flags (dynobj,
1298 name,
1299 flags);
1300 if (sreloc == NULL
1301 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1302 return FALSE;
1303 }
1304 elf_section_data (sec)->sreloc = sreloc;
1305 }
1306
1307 /* If this is a global symbol, we count the number of
1308 relocations we need for this symbol. */
1309 if (h != NULL)
1310 {
1311 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1312 }
1313 else
1314 {
1315 /* Track dynamic relocs needed for local syms too.
1316 We really need local syms available to do this
1317 easily. Oh well. */
1318 asection *s;
1319 void *vpp;
1320
1321 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1322 sec, r_symndx);
1323 if (s == NULL)
1324 return FALSE;
1325
1326 vpp = &elf_section_data (s)->local_dynrel;
1327 head = (struct elf_s390_dyn_relocs **) vpp;
1328 }
1329
1330 p = *head;
1331 if (p == NULL || p->sec != sec)
1332 {
1333 bfd_size_type amt = sizeof *p;
1334
1335 p = ((struct elf_s390_dyn_relocs *)
1336 bfd_alloc (htab->elf.dynobj, amt));
1337 if (p == NULL)
1338 return FALSE;
1339 p->next = *head;
1340 *head = p;
1341 p->sec = sec;
1342 p->count = 0;
1343 p->pc_count = 0;
1344 }
1345
1346 p->count += 1;
1347 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
1348 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
1349 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
1350 || ELF32_R_TYPE (rel->r_info) == R_390_PC32)
1351 p->pc_count += 1;
1352 }
1353 break;
1354
1355 /* This relocation describes the C++ object vtable hierarchy.
1356 Reconstruct it for later use during GC. */
1357 case R_390_GNU_VTINHERIT:
1358 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1359 return FALSE;
1360 break;
1361
1362 /* This relocation describes which C++ vtable entries are actually
1363 used. Record for later use during GC. */
1364 case R_390_GNU_VTENTRY:
1365 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1366 return FALSE;
1367 break;
1368
1369 default:
1370 break;
1371 }
1372 }
1373
1374 return TRUE;
1375 }
1376
1377 /* Return the section that should be marked against GC for a given
1378 relocation. */
1379
1380 static asection *
1381 elf_s390_gc_mark_hook (sec, info, rel, h, sym)
1382 asection *sec;
1383 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1384 Elf_Internal_Rela *rel;
1385 struct elf_link_hash_entry *h;
1386 Elf_Internal_Sym *sym;
1387 {
1388 if (h != NULL)
1389 {
1390 switch (ELF32_R_TYPE (rel->r_info))
1391 {
1392 case R_390_GNU_VTINHERIT:
1393 case R_390_GNU_VTENTRY:
1394 break;
1395
1396 default:
1397 switch (h->root.type)
1398 {
1399 case bfd_link_hash_defined:
1400 case bfd_link_hash_defweak:
1401 return h->root.u.def.section;
1402
1403 case bfd_link_hash_common:
1404 return h->root.u.c.p->section;
1405
1406 default:
1407 break;
1408 }
1409 }
1410 }
1411 else
1412 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1413
1414 return NULL;
1415 }
1416
1417 /* Update the got entry reference counts for the section being removed. */
1418
1419 static bfd_boolean
1420 elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
1421 bfd *abfd;
1422 struct bfd_link_info *info;
1423 asection *sec;
1424 const Elf_Internal_Rela *relocs;
1425 {
1426 Elf_Internal_Shdr *symtab_hdr;
1427 struct elf_link_hash_entry **sym_hashes;
1428 bfd_signed_vma *local_got_refcounts;
1429 const Elf_Internal_Rela *rel, *relend;
1430
1431 elf_section_data (sec)->local_dynrel = NULL;
1432
1433 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1434 sym_hashes = elf_sym_hashes (abfd);
1435 local_got_refcounts = elf_local_got_refcounts (abfd);
1436
1437 relend = relocs + sec->reloc_count;
1438 for (rel = relocs; rel < relend; rel++)
1439 {
1440 unsigned long r_symndx;
1441 unsigned int r_type;
1442 struct elf_link_hash_entry *h = NULL;
1443
1444 r_symndx = ELF32_R_SYM (rel->r_info);
1445 if (r_symndx >= symtab_hdr->sh_info)
1446 {
1447 struct elf_s390_link_hash_entry *eh;
1448 struct elf_s390_dyn_relocs **pp;
1449 struct elf_s390_dyn_relocs *p;
1450
1451 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1452 while (h->root.type == bfd_link_hash_indirect
1453 || h->root.type == bfd_link_hash_warning)
1454 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1455 eh = (struct elf_s390_link_hash_entry *) h;
1456
1457 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1458 if (p->sec == sec)
1459 {
1460 /* Everything must go for SEC. */
1461 *pp = p->next;
1462 break;
1463 }
1464 }
1465
1466 r_type = ELF32_R_TYPE (rel->r_info);
1467 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1468 switch (r_type)
1469 {
1470 case R_390_TLS_LDM32:
1471 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1472 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1473 break;
1474
1475 case R_390_TLS_GD32:
1476 case R_390_TLS_IE32:
1477 case R_390_TLS_GOTIE12:
1478 case R_390_TLS_GOTIE20:
1479 case R_390_TLS_GOTIE32:
1480 case R_390_TLS_IEENT:
1481 case R_390_GOT12:
1482 case R_390_GOT16:
1483 case R_390_GOT20:
1484 case R_390_GOT32:
1485 case R_390_GOTOFF16:
1486 case R_390_GOTOFF32:
1487 case R_390_GOTPC:
1488 case R_390_GOTPCDBL:
1489 case R_390_GOTENT:
1490 if (h != NULL)
1491 {
1492 if (h->got.refcount > 0)
1493 h->got.refcount -= 1;
1494 }
1495 else if (local_got_refcounts != NULL)
1496 {
1497 if (local_got_refcounts[r_symndx] > 0)
1498 local_got_refcounts[r_symndx] -= 1;
1499 }
1500 break;
1501
1502 case R_390_8:
1503 case R_390_12:
1504 case R_390_16:
1505 case R_390_20:
1506 case R_390_32:
1507 case R_390_PC16:
1508 case R_390_PC16DBL:
1509 case R_390_PC32DBL:
1510 case R_390_PC32:
1511 if (info->shared)
1512 break;
1513 /* Fall through. */
1514
1515 case R_390_PLT16DBL:
1516 case R_390_PLT32DBL:
1517 case R_390_PLT32:
1518 case R_390_PLTOFF16:
1519 case R_390_PLTOFF32:
1520 if (h != NULL)
1521 {
1522 if (h->plt.refcount > 0)
1523 h->plt.refcount -= 1;
1524 }
1525 break;
1526
1527 case R_390_GOTPLT12:
1528 case R_390_GOTPLT16:
1529 case R_390_GOTPLT20:
1530 case R_390_GOTPLT32:
1531 case R_390_GOTPLTENT:
1532 if (h != NULL)
1533 {
1534 if (h->plt.refcount > 0)
1535 {
1536 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1537 h->plt.refcount -= 1;
1538 }
1539 }
1540 else if (local_got_refcounts != NULL)
1541 {
1542 if (local_got_refcounts[r_symndx] > 0)
1543 local_got_refcounts[r_symndx] -= 1;
1544 }
1545 break;
1546
1547 default:
1548 break;
1549 }
1550 }
1551
1552 return TRUE;
1553 }
1554
1555 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1556 entry but we found we will not create any. Called when we find we will
1557 not have any PLT for this symbol, by for example
1558 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1559 or elf_s390_size_dynamic_sections if no dynamic sections will be
1560 created (we're only linking static objects). */
1561
1562 static void
1563 elf_s390_adjust_gotplt (h)
1564 struct elf_s390_link_hash_entry *h;
1565 {
1566 if (h->elf.root.type == bfd_link_hash_warning)
1567 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1568
1569 if (h->gotplt_refcount <= 0)
1570 return;
1571
1572 /* We simply add the number of gotplt references to the number
1573 * of got references for this symbol. */
1574 h->elf.got.refcount += h->gotplt_refcount;
1575 h->gotplt_refcount = -1;
1576 }
1577
1578 /* Adjust a symbol defined by a dynamic object and referenced by a
1579 regular object. The current definition is in some section of the
1580 dynamic object, but we're not including those sections. We have to
1581 change the definition to something the rest of the link can
1582 understand. */
1583
1584 static bfd_boolean
1585 elf_s390_adjust_dynamic_symbol (info, h)
1586 struct bfd_link_info *info;
1587 struct elf_link_hash_entry *h;
1588 {
1589 struct elf_s390_link_hash_table *htab;
1590 asection *s;
1591 unsigned int power_of_two;
1592
1593 /* If this is a function, put it in the procedure linkage table. We
1594 will fill in the contents of the procedure linkage table later
1595 (although we could actually do it here). */
1596 if (h->type == STT_FUNC
1597 || h->needs_plt)
1598 {
1599 if (h->plt.refcount <= 0
1600 || (! info->shared
1601 && !h->def_dynamic
1602 && !h->ref_dynamic
1603 && h->root.type != bfd_link_hash_undefweak
1604 && h->root.type != bfd_link_hash_undefined))
1605 {
1606 /* This case can occur if we saw a PLT32 reloc in an input
1607 file, but the symbol was never referred to by a dynamic
1608 object, or if all references were garbage collected. In
1609 such a case, we don't actually need to build a procedure
1610 linkage table, and we can just do a PC32 reloc instead. */
1611 h->plt.offset = (bfd_vma) -1;
1612 h->needs_plt = 0;
1613 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1614 }
1615
1616 return TRUE;
1617 }
1618 else
1619 /* It's possible that we incorrectly decided a .plt reloc was
1620 needed for an R_390_PC32 reloc to a non-function sym in
1621 check_relocs. We can't decide accurately between function and
1622 non-function syms in check-relocs; Objects loaded later in
1623 the link may change h->type. So fix it now. */
1624 h->plt.offset = (bfd_vma) -1;
1625
1626 /* If this is a weak symbol, and there is a real definition, the
1627 processor independent code will have arranged for us to see the
1628 real definition first, and we can just use the same value. */
1629 if (h->u.weakdef != NULL)
1630 {
1631 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1632 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1633 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1634 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1635 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1636 h->non_got_ref = h->u.weakdef->non_got_ref;
1637 return TRUE;
1638 }
1639
1640 /* This is a reference to a symbol defined by a dynamic object which
1641 is not a function. */
1642
1643 /* If we are creating a shared library, we must presume that the
1644 only references to the symbol are via the global offset table.
1645 For such cases we need not do anything here; the relocations will
1646 be handled correctly by relocate_section. */
1647 if (info->shared)
1648 return TRUE;
1649
1650 /* If there are no references to this symbol that do not use the
1651 GOT, we don't need to generate a copy reloc. */
1652 if (!h->non_got_ref)
1653 return TRUE;
1654
1655 /* If -z nocopyreloc was given, we won't generate them either. */
1656 if (info->nocopyreloc)
1657 {
1658 h->non_got_ref = 0;
1659 return TRUE;
1660 }
1661
1662 if (ELIMINATE_COPY_RELOCS)
1663 {
1664 struct elf_s390_link_hash_entry * eh;
1665 struct elf_s390_dyn_relocs *p;
1666
1667 eh = (struct elf_s390_link_hash_entry *) h;
1668 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1669 {
1670 s = p->sec->output_section;
1671 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1672 break;
1673 }
1674
1675 /* If we didn't find any dynamic relocs in read-only sections, then
1676 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1677 if (p == NULL)
1678 {
1679 h->non_got_ref = 0;
1680 return TRUE;
1681 }
1682 }
1683
1684 if (h->size == 0)
1685 {
1686 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1687 h->root.root.string);
1688 return TRUE;
1689 }
1690
1691 /* We must allocate the symbol in our .dynbss section, which will
1692 become part of the .bss section of the executable. There will be
1693 an entry for this symbol in the .dynsym section. The dynamic
1694 object will contain position independent code, so all references
1695 from the dynamic object to this symbol will go through the global
1696 offset table. The dynamic linker will use the .dynsym entry to
1697 determine the address it must put in the global offset table, so
1698 both the dynamic object and the regular object will refer to the
1699 same memory location for the variable. */
1700
1701 htab = elf_s390_hash_table (info);
1702
1703 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1704 copy the initial value out of the dynamic object and into the
1705 runtime process image. */
1706 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1707 {
1708 htab->srelbss->size += sizeof (Elf32_External_Rela);
1709 h->needs_copy = 1;
1710 }
1711
1712 /* We need to figure out the alignment required for this symbol. I
1713 have no idea how ELF linkers handle this. */
1714 power_of_two = bfd_log2 (h->size);
1715 if (power_of_two > 3)
1716 power_of_two = 3;
1717
1718 /* Apply the required alignment. */
1719 s = htab->sdynbss;
1720 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1721 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1722 {
1723 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1724 return FALSE;
1725 }
1726
1727 /* Define the symbol as being at this point in the section. */
1728 h->root.u.def.section = s;
1729 h->root.u.def.value = s->size;
1730
1731 /* Increment the section size to make room for the symbol. */
1732 s->size += h->size;
1733
1734 return TRUE;
1735 }
1736
1737 /* Allocate space in .plt, .got and associated reloc sections for
1738 dynamic relocs. */
1739
1740 static bfd_boolean
1741 allocate_dynrelocs (h, inf)
1742 struct elf_link_hash_entry *h;
1743 PTR inf;
1744 {
1745 struct bfd_link_info *info;
1746 struct elf_s390_link_hash_table *htab;
1747 struct elf_s390_link_hash_entry *eh;
1748 struct elf_s390_dyn_relocs *p;
1749
1750 if (h->root.type == bfd_link_hash_indirect)
1751 return TRUE;
1752
1753 if (h->root.type == bfd_link_hash_warning)
1754 /* When warning symbols are created, they **replace** the "real"
1755 entry in the hash table, thus we never get to see the real
1756 symbol in a hash traversal. So look at it now. */
1757 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1758
1759 info = (struct bfd_link_info *) inf;
1760 htab = elf_s390_hash_table (info);
1761
1762 if (htab->elf.dynamic_sections_created
1763 && h->plt.refcount > 0
1764 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1765 || h->root.type != bfd_link_hash_undefweak))
1766 {
1767 /* Make sure this symbol is output as a dynamic symbol.
1768 Undefined weak syms won't yet be marked as dynamic. */
1769 if (h->dynindx == -1
1770 && !h->forced_local)
1771 {
1772 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1773 return FALSE;
1774 }
1775
1776 if (info->shared
1777 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1778 {
1779 asection *s = htab->splt;
1780
1781 /* If this is the first .plt entry, make room for the special
1782 first entry. */
1783 if (s->size == 0)
1784 s->size += PLT_FIRST_ENTRY_SIZE;
1785
1786 h->plt.offset = s->size;
1787
1788 /* If this symbol is not defined in a regular file, and we are
1789 not generating a shared library, then set the symbol to this
1790 location in the .plt. This is required to make function
1791 pointers compare as equal between the normal executable and
1792 the shared library. */
1793 if (! info->shared
1794 && !h->def_regular)
1795 {
1796 h->root.u.def.section = s;
1797 h->root.u.def.value = h->plt.offset;
1798 }
1799
1800 /* Make room for this entry. */
1801 s->size += PLT_ENTRY_SIZE;
1802
1803 /* We also need to make an entry in the .got.plt section, which
1804 will be placed in the .got section by the linker script. */
1805 htab->sgotplt->size += GOT_ENTRY_SIZE;
1806
1807 /* We also need to make an entry in the .rela.plt section. */
1808 htab->srelplt->size += sizeof (Elf32_External_Rela);
1809 }
1810 else
1811 {
1812 h->plt.offset = (bfd_vma) -1;
1813 h->needs_plt = 0;
1814 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1815 }
1816 }
1817 else
1818 {
1819 h->plt.offset = (bfd_vma) -1;
1820 h->needs_plt = 0;
1821 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1822 }
1823
1824 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to
1825 the binary, we can optimize a bit. IE32 and GOTIE32 get converted
1826 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT
1827 we can save the dynamic TLS relocation. */
1828 if (h->got.refcount > 0
1829 && !info->shared
1830 && h->dynindx == -1
1831 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1832 {
1833 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1834 /* For the GOTIE access without a literal pool entry the offset has
1835 to be stored somewhere. The immediate value in the instruction
1836 is not bit enough so the value is stored in the got. */
1837 {
1838 h->got.offset = htab->sgot->size;
1839 htab->sgot->size += GOT_ENTRY_SIZE;
1840 }
1841 else
1842 h->got.offset = (bfd_vma) -1;
1843 }
1844 else if (h->got.refcount > 0)
1845 {
1846 asection *s;
1847 bfd_boolean dyn;
1848 int tls_type = elf_s390_hash_entry(h)->tls_type;
1849
1850 /* Make sure this symbol is output as a dynamic symbol.
1851 Undefined weak syms won't yet be marked as dynamic. */
1852 if (h->dynindx == -1
1853 && !h->forced_local)
1854 {
1855 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1856 return FALSE;
1857 }
1858
1859 s = htab->sgot;
1860 h->got.offset = s->size;
1861 s->size += GOT_ENTRY_SIZE;
1862 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */
1863 if (tls_type == GOT_TLS_GD)
1864 s->size += GOT_ENTRY_SIZE;
1865 dyn = htab->elf.dynamic_sections_created;
1866 /* R_390_TLS_IE32 needs one dynamic relocation,
1867 R_390_TLS_GD32 needs one if local symbol and two if global. */
1868 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1869 || tls_type >= GOT_TLS_IE)
1870 htab->srelgot->size += sizeof (Elf32_External_Rela);
1871 else if (tls_type == GOT_TLS_GD)
1872 htab->srelgot->size += 2 * sizeof (Elf32_External_Rela);
1873 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1874 || h->root.type != bfd_link_hash_undefweak)
1875 && (info->shared
1876 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1877 htab->srelgot->size += sizeof (Elf32_External_Rela);
1878 }
1879 else
1880 h->got.offset = (bfd_vma) -1;
1881
1882 eh = (struct elf_s390_link_hash_entry *) h;
1883 if (eh->dyn_relocs == NULL)
1884 return TRUE;
1885
1886 /* In the shared -Bsymbolic case, discard space allocated for
1887 dynamic pc-relative relocs against symbols which turn out to be
1888 defined in regular objects. For the normal shared case, discard
1889 space for pc-relative relocs that have become local due to symbol
1890 visibility changes. */
1891
1892 if (info->shared)
1893 {
1894 if (SYMBOL_REFERENCES_LOCAL (info, h))
1895 {
1896 struct elf_s390_dyn_relocs **pp;
1897
1898 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1899 {
1900 p->count -= p->pc_count;
1901 p->pc_count = 0;
1902 if (p->count == 0)
1903 *pp = p->next;
1904 else
1905 pp = &p->next;
1906 }
1907 }
1908
1909 /* Also discard relocs on undefined weak syms with non-default
1910 visibility. */
1911 if (eh->dyn_relocs != NULL
1912 && h->root.type == bfd_link_hash_undefweak)
1913 {
1914 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1915 eh->dyn_relocs = NULL;
1916
1917 /* Make sure undefined weak symbols are output as a dynamic
1918 symbol in PIEs. */
1919 else if (h->dynindx == -1
1920 && !h->forced_local)
1921 {
1922 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1923 return FALSE;
1924 }
1925 }
1926 }
1927 else if (ELIMINATE_COPY_RELOCS)
1928 {
1929 /* For the non-shared case, discard space for relocs against
1930 symbols which turn out to need copy relocs or are not
1931 dynamic. */
1932
1933 if (!h->non_got_ref
1934 && ((h->def_dynamic
1935 && !h->def_regular)
1936 || (htab->elf.dynamic_sections_created
1937 && (h->root.type == bfd_link_hash_undefweak
1938 || h->root.type == bfd_link_hash_undefined))))
1939 {
1940 /* Make sure this symbol is output as a dynamic symbol.
1941 Undefined weak syms won't yet be marked as dynamic. */
1942 if (h->dynindx == -1
1943 && !h->forced_local)
1944 {
1945 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1946 return FALSE;
1947 }
1948
1949 /* If that succeeded, we know we'll be keeping all the
1950 relocs. */
1951 if (h->dynindx != -1)
1952 goto keep;
1953 }
1954
1955 eh->dyn_relocs = NULL;
1956
1957 keep: ;
1958 }
1959
1960 /* Finally, allocate space. */
1961 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1962 {
1963 asection *sreloc = elf_section_data (p->sec)->sreloc;
1964
1965 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1966 }
1967
1968 return TRUE;
1969 }
1970
1971 /* Find any dynamic relocs that apply to read-only sections. */
1972
1973 static bfd_boolean
1974 readonly_dynrelocs (h, inf)
1975 struct elf_link_hash_entry *h;
1976 PTR inf;
1977 {
1978 struct elf_s390_link_hash_entry *eh;
1979 struct elf_s390_dyn_relocs *p;
1980
1981 if (h->root.type == bfd_link_hash_warning)
1982 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1983
1984 eh = (struct elf_s390_link_hash_entry *) h;
1985 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1986 {
1987 asection *s = p->sec->output_section;
1988
1989 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1990 {
1991 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1992
1993 info->flags |= DF_TEXTREL;
1994
1995 /* Not an error, just cut short the traversal. */
1996 return FALSE;
1997 }
1998 }
1999 return TRUE;
2000 }
2001
2002 /* Set the sizes of the dynamic sections. */
2003
2004 static bfd_boolean
2005 elf_s390_size_dynamic_sections (output_bfd, info)
2006 bfd *output_bfd ATTRIBUTE_UNUSED;
2007 struct bfd_link_info *info;
2008 {
2009 struct elf_s390_link_hash_table *htab;
2010 bfd *dynobj;
2011 asection *s;
2012 bfd_boolean relocs;
2013 bfd *ibfd;
2014
2015 htab = elf_s390_hash_table (info);
2016 dynobj = htab->elf.dynobj;
2017 if (dynobj == NULL)
2018 abort ();
2019
2020 if (htab->elf.dynamic_sections_created)
2021 {
2022 /* Set the contents of the .interp section to the interpreter. */
2023 if (info->executable)
2024 {
2025 s = bfd_get_section_by_name (dynobj, ".interp");
2026 if (s == NULL)
2027 abort ();
2028 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2029 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2030 }
2031 }
2032
2033 /* Set up .got offsets for local syms, and space for local dynamic
2034 relocs. */
2035 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2036 {
2037 bfd_signed_vma *local_got;
2038 bfd_signed_vma *end_local_got;
2039 char *local_tls_type;
2040 bfd_size_type locsymcount;
2041 Elf_Internal_Shdr *symtab_hdr;
2042 asection *srela;
2043
2044 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
2045 continue;
2046
2047 for (s = ibfd->sections; s != NULL; s = s->next)
2048 {
2049 struct elf_s390_dyn_relocs *p;
2050
2051 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
2052 {
2053 if (!bfd_is_abs_section (p->sec)
2054 && bfd_is_abs_section (p->sec->output_section))
2055 {
2056 /* Input section has been discarded, either because
2057 it is a copy of a linkonce section or due to
2058 linker script /DISCARD/, so we'll be discarding
2059 the relocs too. */
2060 }
2061 else if (p->count != 0)
2062 {
2063 srela = elf_section_data (p->sec)->sreloc;
2064 srela->size += p->count * sizeof (Elf32_External_Rela);
2065 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2066 info->flags |= DF_TEXTREL;
2067 }
2068 }
2069 }
2070
2071 local_got = elf_local_got_refcounts (ibfd);
2072 if (!local_got)
2073 continue;
2074
2075 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2076 locsymcount = symtab_hdr->sh_info;
2077 end_local_got = local_got + locsymcount;
2078 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2079 s = htab->sgot;
2080 srela = htab->srelgot;
2081 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2082 {
2083 if (*local_got > 0)
2084 {
2085 *local_got = s->size;
2086 s->size += GOT_ENTRY_SIZE;
2087 if (*local_tls_type == GOT_TLS_GD)
2088 s->size += GOT_ENTRY_SIZE;
2089 if (info->shared)
2090 srela->size += sizeof (Elf32_External_Rela);
2091 }
2092 else
2093 *local_got = (bfd_vma) -1;
2094 }
2095 }
2096
2097 if (htab->tls_ldm_got.refcount > 0)
2098 {
2099 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32
2100 relocs. */
2101 htab->tls_ldm_got.offset = htab->sgot->size;
2102 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2103 htab->srelgot->size += sizeof (Elf32_External_Rela);
2104 }
2105 else
2106 htab->tls_ldm_got.offset = -1;
2107
2108 /* Allocate global sym .plt and .got entries, and space for global
2109 sym dynamic relocs. */
2110 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2111
2112 /* We now have determined the sizes of the various dynamic sections.
2113 Allocate memory for them. */
2114 relocs = FALSE;
2115 for (s = dynobj->sections; s != NULL; s = s->next)
2116 {
2117 if ((s->flags & SEC_LINKER_CREATED) == 0)
2118 continue;
2119
2120 if (s == htab->splt
2121 || s == htab->sgot
2122 || s == htab->sgotplt
2123 || s == htab->sdynbss)
2124 {
2125 /* Strip this section if we don't need it; see the
2126 comment below. */
2127 }
2128 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
2129 {
2130 if (s->size != 0)
2131 relocs = TRUE;
2132
2133 /* We use the reloc_count field as a counter if we need
2134 to copy relocs into the output file. */
2135 s->reloc_count = 0;
2136 }
2137 else
2138 {
2139 /* It's not one of our sections, so don't allocate space. */
2140 continue;
2141 }
2142
2143 if (s->size == 0)
2144 {
2145 /* If we don't need this section, strip it from the
2146 output file. This is to handle .rela.bss and
2147 .rela.plt. We must create it in
2148 create_dynamic_sections, because it must be created
2149 before the linker maps input sections to output
2150 sections. The linker does that before
2151 adjust_dynamic_symbol is called, and it is that
2152 function which decides whether anything needs to go
2153 into these sections. */
2154
2155 s->flags |= SEC_EXCLUDE;
2156 continue;
2157 }
2158
2159 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2160 continue;
2161
2162 /* Allocate memory for the section contents. We use bfd_zalloc
2163 here in case unused entries are not reclaimed before the
2164 section's contents are written out. This should not happen,
2165 but this way if it does, we get a R_390_NONE reloc instead
2166 of garbage. */
2167 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2168 if (s->contents == NULL)
2169 return FALSE;
2170 }
2171
2172 if (htab->elf.dynamic_sections_created)
2173 {
2174 /* Add some entries to the .dynamic section. We fill in the
2175 values later, in elf_s390_finish_dynamic_sections, but we
2176 must add the entries now so that we get the correct size for
2177 the .dynamic section. The DT_DEBUG entry is filled in by the
2178 dynamic linker and used by the debugger. */
2179 #define add_dynamic_entry(TAG, VAL) \
2180 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2181
2182 if (info->executable)
2183 {
2184 if (!add_dynamic_entry (DT_DEBUG, 0))
2185 return FALSE;
2186 }
2187
2188 if (htab->splt->size != 0)
2189 {
2190 if (!add_dynamic_entry (DT_PLTGOT, 0)
2191 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2192 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2193 || !add_dynamic_entry (DT_JMPREL, 0))
2194 return FALSE;
2195 }
2196
2197 if (relocs)
2198 {
2199 if (!add_dynamic_entry (DT_RELA, 0)
2200 || !add_dynamic_entry (DT_RELASZ, 0)
2201 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2202 return FALSE;
2203
2204 /* If any dynamic relocs apply to a read-only section,
2205 then we need a DT_TEXTREL entry. */
2206 if ((info->flags & DF_TEXTREL) == 0)
2207 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2208 (PTR) info);
2209
2210 if ((info->flags & DF_TEXTREL) != 0)
2211 {
2212 if (!add_dynamic_entry (DT_TEXTREL, 0))
2213 return FALSE;
2214 }
2215 }
2216 }
2217 #undef add_dynamic_entry
2218
2219 return TRUE;
2220 }
2221
2222 /* Return the base VMA address which should be subtracted from real addresses
2223 when resolving @dtpoff relocation.
2224 This is PT_TLS segment p_vaddr. */
2225
2226 static bfd_vma
2227 dtpoff_base (info)
2228 struct bfd_link_info *info;
2229 {
2230 /* If tls_sec is NULL, we should have signalled an error already. */
2231 if (elf_hash_table (info)->tls_sec == NULL)
2232 return 0;
2233 return elf_hash_table (info)->tls_sec->vma;
2234 }
2235
2236 /* Return the relocation value for @tpoff relocation
2237 if STT_TLS virtual address is ADDRESS. */
2238
2239 static bfd_vma
2240 tpoff (info, address)
2241 struct bfd_link_info *info;
2242 bfd_vma address;
2243 {
2244 struct elf_link_hash_table *htab = elf_hash_table (info);
2245
2246 /* If tls_sec is NULL, we should have signalled an error already. */
2247 if (htab->tls_sec == NULL)
2248 return 0;
2249 return htab->tls_size + htab->tls_sec->vma - address;
2250 }
2251
2252 /* Complain if TLS instruction relocation is against an invalid
2253 instruction. */
2254
2255 static void
2256 invalid_tls_insn (input_bfd, input_section, rel)
2257 bfd *input_bfd;
2258 asection *input_section;
2259 Elf_Internal_Rela *rel;
2260 {
2261 reloc_howto_type *howto;
2262
2263 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info);
2264 (*_bfd_error_handler)
2265 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2266 input_bfd,
2267 input_section,
2268 (long) rel->r_offset,
2269 howto->name);
2270 }
2271
2272 /* Relocate a 390 ELF section. */
2273
2274 static bfd_boolean
2275 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2276 contents, relocs, local_syms, local_sections)
2277 bfd *output_bfd;
2278 struct bfd_link_info *info;
2279 bfd *input_bfd;
2280 asection *input_section;
2281 bfd_byte *contents;
2282 Elf_Internal_Rela *relocs;
2283 Elf_Internal_Sym *local_syms;
2284 asection **local_sections;
2285 {
2286 struct elf_s390_link_hash_table *htab;
2287 Elf_Internal_Shdr *symtab_hdr;
2288 struct elf_link_hash_entry **sym_hashes;
2289 bfd_vma *local_got_offsets;
2290 Elf_Internal_Rela *rel;
2291 Elf_Internal_Rela *relend;
2292
2293 if (info->relocatable)
2294 return TRUE;
2295
2296 htab = elf_s390_hash_table (info);
2297 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2298 sym_hashes = elf_sym_hashes (input_bfd);
2299 local_got_offsets = elf_local_got_offsets (input_bfd);
2300
2301 rel = relocs;
2302 relend = relocs + input_section->reloc_count;
2303 for (; rel < relend; rel++)
2304 {
2305 unsigned int r_type;
2306 reloc_howto_type *howto;
2307 unsigned long r_symndx;
2308 struct elf_link_hash_entry *h;
2309 Elf_Internal_Sym *sym;
2310 asection *sec;
2311 bfd_vma off;
2312 bfd_vma relocation;
2313 bfd_boolean unresolved_reloc;
2314 bfd_reloc_status_type r;
2315 int tls_type;
2316
2317 r_type = ELF32_R_TYPE (rel->r_info);
2318 if (r_type == (int) R_390_GNU_VTINHERIT
2319 || r_type == (int) R_390_GNU_VTENTRY)
2320 continue;
2321 if (r_type >= (int) R_390_max)
2322 {
2323 bfd_set_error (bfd_error_bad_value);
2324 return FALSE;
2325 }
2326
2327 howto = elf_howto_table + r_type;
2328 r_symndx = ELF32_R_SYM (rel->r_info);
2329
2330 /* This is a final link. */
2331 h = NULL;
2332 sym = NULL;
2333 sec = NULL;
2334 unresolved_reloc = FALSE;
2335 if (r_symndx < symtab_hdr->sh_info)
2336 {
2337 sym = local_syms + r_symndx;
2338 sec = local_sections[r_symndx];
2339 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2340 }
2341 else
2342 {
2343 bfd_boolean warned ATTRIBUTE_UNUSED;
2344
2345 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2346 r_symndx, symtab_hdr, sym_hashes,
2347 h, sec, relocation,
2348 unresolved_reloc, warned);
2349 }
2350
2351 switch (r_type)
2352 {
2353 case R_390_GOTPLT12:
2354 case R_390_GOTPLT16:
2355 case R_390_GOTPLT20:
2356 case R_390_GOTPLT32:
2357 case R_390_GOTPLTENT:
2358 /* There are three cases for a GOTPLT relocation. 1) The
2359 relocation is against the jump slot entry of a plt that
2360 will get emitted to the output file. 2) The relocation
2361 is against the jump slot of a plt entry that has been
2362 removed. elf_s390_adjust_gotplt has created a GOT entry
2363 as replacement. 3) The relocation is against a local symbol.
2364 Cases 2) and 3) are the same as the GOT relocation code
2365 so we just have to test for case 1 and fall through for
2366 the other two. */
2367 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2368 {
2369 bfd_vma plt_index;
2370
2371 /* Calc. index no.
2372 Current offset - size first entry / entry size. */
2373 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2374 PLT_ENTRY_SIZE;
2375
2376 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2377 addr & GOT addr. */
2378 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2379 unresolved_reloc = FALSE;
2380
2381 if (r_type == R_390_GOTPLTENT)
2382 relocation += htab->sgot->output_section->vma;
2383 break;
2384 }
2385 /* Fall through. */
2386
2387 case R_390_GOT12:
2388 case R_390_GOT16:
2389 case R_390_GOT20:
2390 case R_390_GOT32:
2391 case R_390_GOTENT:
2392 /* Relocation is to the entry for this symbol in the global
2393 offset table. */
2394 if (htab->sgot == NULL)
2395 abort ();
2396
2397 if (h != NULL)
2398 {
2399 bfd_boolean dyn;
2400
2401 off = h->got.offset;
2402 dyn = htab->elf.dynamic_sections_created;
2403 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2404 || (info->shared
2405 && (info->symbolic
2406 || h->dynindx == -1
2407 || h->forced_local)
2408 && h->def_regular)
2409 || (ELF_ST_VISIBILITY (h->other)
2410 && h->root.type == bfd_link_hash_undefweak))
2411 {
2412 /* This is actually a static link, or it is a
2413 -Bsymbolic link and the symbol is defined
2414 locally, or the symbol was forced to be local
2415 because of a version file. We must initialize
2416 this entry in the global offset table. Since the
2417 offset must always be a multiple of 2, we use the
2418 least significant bit to record whether we have
2419 initialized it already.
2420
2421 When doing a dynamic link, we create a .rel.got
2422 relocation entry to initialize the value. This
2423 is done in the finish_dynamic_symbol routine. */
2424 if ((off & 1) != 0)
2425 off &= ~1;
2426 else
2427 {
2428 bfd_put_32 (output_bfd, relocation,
2429 htab->sgot->contents + off);
2430 h->got.offset |= 1;
2431 }
2432 }
2433 else
2434 unresolved_reloc = FALSE;
2435 }
2436 else
2437 {
2438 if (local_got_offsets == NULL)
2439 abort ();
2440
2441 off = local_got_offsets[r_symndx];
2442
2443 /* The offset must always be a multiple of 4. We use
2444 the least significant bit to record whether we have
2445 already generated the necessary reloc. */
2446 if ((off & 1) != 0)
2447 off &= ~1;
2448 else
2449 {
2450 bfd_put_32 (output_bfd, relocation,
2451 htab->sgot->contents + off);
2452
2453 if (info->shared)
2454 {
2455 asection *srelgot;
2456 Elf_Internal_Rela outrel;
2457 bfd_byte *loc;
2458
2459 srelgot = htab->srelgot;
2460 if (srelgot == NULL)
2461 abort ();
2462
2463 outrel.r_offset = (htab->sgot->output_section->vma
2464 + htab->sgot->output_offset
2465 + off);
2466 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2467 outrel.r_addend = relocation;
2468 loc = srelgot->contents;
2469 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
2470 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2471 }
2472
2473 local_got_offsets[r_symndx] |= 1;
2474 }
2475 }
2476
2477 if (off >= (bfd_vma) -2)
2478 abort ();
2479
2480 relocation = htab->sgot->output_offset + off;
2481
2482 /* For @GOTENT the relocation is against the offset between
2483 the instruction and the symbols entry in the GOT and not
2484 between the start of the GOT and the symbols entry. We
2485 add the vma of the GOT to get the correct value. */
2486 if ( r_type == R_390_GOTENT
2487 || r_type == R_390_GOTPLTENT)
2488 relocation += htab->sgot->output_section->vma;
2489
2490 break;
2491
2492 case R_390_GOTOFF16:
2493 case R_390_GOTOFF32:
2494 /* Relocation is relative to the start of the global offset
2495 table. */
2496
2497 /* Note that sgot->output_offset is not involved in this
2498 calculation. We always want the start of .got. If we
2499 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2500 permitted by the ABI, we might have to change this
2501 calculation. */
2502 relocation -= htab->sgot->output_section->vma;
2503 break;
2504
2505 case R_390_GOTPC:
2506 case R_390_GOTPCDBL:
2507 /* Use global offset table as symbol value. */
2508 relocation = htab->sgot->output_section->vma;
2509 unresolved_reloc = FALSE;
2510 break;
2511
2512 case R_390_PLT16DBL:
2513 case R_390_PLT32DBL:
2514 case R_390_PLT32:
2515 /* Relocation is to the entry for this symbol in the
2516 procedure linkage table. */
2517
2518 /* Resolve a PLT32 reloc against a local symbol directly,
2519 without using the procedure linkage table. */
2520 if (h == NULL)
2521 break;
2522
2523 if (h->plt.offset == (bfd_vma) -1
2524 || htab->splt == NULL)
2525 {
2526 /* We didn't make a PLT entry for this symbol. This
2527 happens when statically linking PIC code, or when
2528 using -Bsymbolic. */
2529 break;
2530 }
2531
2532 relocation = (htab->splt->output_section->vma
2533 + htab->splt->output_offset
2534 + h->plt.offset);
2535 unresolved_reloc = FALSE;
2536 break;
2537
2538 case R_390_PLTOFF16:
2539 case R_390_PLTOFF32:
2540 /* Relocation is to the entry for this symbol in the
2541 procedure linkage table relative to the start of the GOT. */
2542
2543 /* For local symbols or if we didn't make a PLT entry for
2544 this symbol resolve the symbol directly. */
2545 if ( h == NULL
2546 || h->plt.offset == (bfd_vma) -1
2547 || htab->splt == NULL)
2548 {
2549 relocation -= htab->sgot->output_section->vma;
2550 break;
2551 }
2552
2553 relocation = (htab->splt->output_section->vma
2554 + htab->splt->output_offset
2555 + h->plt.offset
2556 - htab->sgot->output_section->vma);
2557 unresolved_reloc = FALSE;
2558 break;
2559
2560 case R_390_8:
2561 case R_390_16:
2562 case R_390_32:
2563 case R_390_PC16:
2564 case R_390_PC16DBL:
2565 case R_390_PC32DBL:
2566 case R_390_PC32:
2567 /* r_symndx will be zero only for relocs against symbols
2568 from removed linkonce sections, or sections discarded by
2569 a linker script. */
2570 if (r_symndx == 0
2571 || (input_section->flags & SEC_ALLOC) == 0)
2572 break;
2573
2574 if ((info->shared
2575 && (h == NULL
2576 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2577 || h->root.type != bfd_link_hash_undefweak)
2578 && ((r_type != R_390_PC16
2579 && r_type != R_390_PC16DBL
2580 && r_type != R_390_PC32DBL
2581 && r_type != R_390_PC32)
2582 || (h != NULL
2583 && !SYMBOL_REFERENCES_LOCAL (info, h))))
2584 || (ELIMINATE_COPY_RELOCS
2585 && !info->shared
2586 && h != NULL
2587 && h->dynindx != -1
2588 && !h->non_got_ref
2589 && ((h->def_dynamic
2590 && !h->def_regular)
2591 || h->root.type == bfd_link_hash_undefweak
2592 || h->root.type == bfd_link_hash_undefined)))
2593 {
2594 Elf_Internal_Rela outrel;
2595 bfd_boolean skip, relocate;
2596 asection *sreloc;
2597 bfd_byte *loc;
2598
2599 /* When generating a shared object, these relocations
2600 are copied into the output file to be resolved at run
2601 time. */
2602
2603 skip = FALSE;
2604 relocate = FALSE;
2605
2606 outrel.r_offset =
2607 _bfd_elf_section_offset (output_bfd, info, input_section,
2608 rel->r_offset);
2609 if (outrel.r_offset == (bfd_vma) -1)
2610 skip = TRUE;
2611 else if (outrel.r_offset == (bfd_vma) -2)
2612 skip = TRUE, relocate = TRUE;
2613 outrel.r_offset += (input_section->output_section->vma
2614 + input_section->output_offset);
2615
2616 if (skip)
2617 memset (&outrel, 0, sizeof outrel);
2618 else if (h != NULL
2619 && h->dynindx != -1
2620 && (r_type == R_390_PC16
2621 || r_type == R_390_PC16DBL
2622 || r_type == R_390_PC32DBL
2623 || r_type == R_390_PC32
2624 || !info->shared
2625 || !info->symbolic
2626 || !h->def_regular))
2627 {
2628 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2629 outrel.r_addend = rel->r_addend;
2630 }
2631 else
2632 {
2633 /* This symbol is local, or marked to become local. */
2634 outrel.r_addend = relocation + rel->r_addend;
2635 if (r_type == R_390_32)
2636 {
2637 relocate = TRUE;
2638 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2639 }
2640 else
2641 {
2642 long sindx;
2643
2644 if (bfd_is_abs_section (sec))
2645 sindx = 0;
2646 else if (sec == NULL || sec->owner == NULL)
2647 {
2648 bfd_set_error(bfd_error_bad_value);
2649 return FALSE;
2650 }
2651 else
2652 {
2653 asection *osec;
2654
2655 osec = sec->output_section;
2656 sindx = elf_section_data (osec)->dynindx;
2657 BFD_ASSERT (sindx > 0);
2658
2659 /* We are turning this relocation into one
2660 against a section symbol, so subtract out
2661 the output section's address but not the
2662 offset of the input section in the output
2663 section. */
2664
2665 outrel.r_addend -= osec->vma;
2666 }
2667 outrel.r_info = ELF32_R_INFO (sindx, r_type);
2668 }
2669 }
2670
2671 sreloc = elf_section_data (input_section)->sreloc;
2672 if (sreloc == NULL)
2673 abort ();
2674
2675 loc = sreloc->contents;
2676 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2677 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2678
2679 /* If this reloc is against an external symbol, we do
2680 not want to fiddle with the addend. Otherwise, we
2681 need to include the symbol value so that it becomes
2682 an addend for the dynamic reloc. */
2683 if (! relocate)
2684 continue;
2685 }
2686 break;
2687
2688 /* Relocations for tls literal pool entries. */
2689 case R_390_TLS_IE32:
2690 if (info->shared)
2691 {
2692 Elf_Internal_Rela outrel;
2693 asection *sreloc;
2694 bfd_byte *loc;
2695
2696 outrel.r_offset = rel->r_offset
2697 + input_section->output_section->vma
2698 + input_section->output_offset;
2699 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2700 sreloc = elf_section_data (input_section)->sreloc;
2701 if (sreloc == NULL)
2702 abort ();
2703 loc = sreloc->contents;
2704 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2705 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2706 }
2707 /* Fall through. */
2708
2709 case R_390_TLS_GD32:
2710 case R_390_TLS_GOTIE32:
2711 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2712 tls_type = GOT_UNKNOWN;
2713 if (h == NULL && local_got_offsets)
2714 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2715 else if (h != NULL)
2716 {
2717 tls_type = elf_s390_hash_entry(h)->tls_type;
2718 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2719 r_type = R_390_TLS_LE32;
2720 }
2721 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE)
2722 r_type = R_390_TLS_IE32;
2723
2724 if (r_type == R_390_TLS_LE32)
2725 {
2726 /* This relocation gets optimized away by the local exec
2727 access optimization. */
2728 BFD_ASSERT (! unresolved_reloc);
2729 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2730 contents + rel->r_offset);
2731 continue;
2732 }
2733
2734 if (htab->sgot == NULL)
2735 abort ();
2736
2737 if (h != NULL)
2738 off = h->got.offset;
2739 else
2740 {
2741 if (local_got_offsets == NULL)
2742 abort ();
2743
2744 off = local_got_offsets[r_symndx];
2745 }
2746
2747 emit_tls_relocs:
2748
2749 if ((off & 1) != 0)
2750 off &= ~1;
2751 else
2752 {
2753 Elf_Internal_Rela outrel;
2754 bfd_byte *loc;
2755 int dr_type, indx;
2756
2757 if (htab->srelgot == NULL)
2758 abort ();
2759
2760 outrel.r_offset = (htab->sgot->output_section->vma
2761 + htab->sgot->output_offset + off);
2762
2763 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2764 if (r_type == R_390_TLS_GD32)
2765 dr_type = R_390_TLS_DTPMOD;
2766 else
2767 dr_type = R_390_TLS_TPOFF;
2768 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2769 outrel.r_addend = relocation - dtpoff_base (info);
2770 else
2771 outrel.r_addend = 0;
2772 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2773 loc = htab->srelgot->contents;
2774 loc += htab->srelgot->reloc_count++
2775 * sizeof (Elf32_External_Rela);
2776 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2777
2778 if (r_type == R_390_TLS_GD32)
2779 {
2780 if (indx == 0)
2781 {
2782 BFD_ASSERT (! unresolved_reloc);
2783 bfd_put_32 (output_bfd,
2784 relocation - dtpoff_base (info),
2785 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2786 }
2787 else
2788 {
2789 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF);
2790 outrel.r_offset += GOT_ENTRY_SIZE;
2791 outrel.r_addend = 0;
2792 htab->srelgot->reloc_count++;
2793 loc += sizeof (Elf32_External_Rela);
2794 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2795 }
2796 }
2797
2798 if (h != NULL)
2799 h->got.offset |= 1;
2800 else
2801 local_got_offsets[r_symndx] |= 1;
2802 }
2803
2804 if (off >= (bfd_vma) -2)
2805 abort ();
2806 if (r_type == ELF32_R_TYPE (rel->r_info))
2807 {
2808 relocation = htab->sgot->output_offset + off;
2809 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT)
2810 relocation += htab->sgot->output_section->vma;
2811 unresolved_reloc = FALSE;
2812 }
2813 else
2814 {
2815 bfd_put_32 (output_bfd, htab->sgot->output_offset + off,
2816 contents + rel->r_offset);
2817 continue;
2818 }
2819 break;
2820
2821 case R_390_TLS_GOTIE12:
2822 case R_390_TLS_GOTIE20:
2823 case R_390_TLS_IEENT:
2824 if (h == NULL)
2825 {
2826 if (local_got_offsets == NULL)
2827 abort();
2828 off = local_got_offsets[r_symndx];
2829 if (info->shared)
2830 goto emit_tls_relocs;
2831 }
2832 else
2833 {
2834 off = h->got.offset;
2835 tls_type = elf_s390_hash_entry(h)->tls_type;
2836 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2837 goto emit_tls_relocs;
2838 }
2839
2840 if (htab->sgot == NULL)
2841 abort ();
2842
2843 BFD_ASSERT (! unresolved_reloc);
2844 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2845 htab->sgot->contents + off);
2846 relocation = htab->sgot->output_offset + off;
2847 if (r_type == R_390_TLS_IEENT)
2848 relocation += htab->sgot->output_section->vma;
2849 unresolved_reloc = FALSE;
2850 break;
2851
2852 case R_390_TLS_LDM32:
2853 if (! info->shared)
2854 /* The literal pool entry this relocation refers to gets ignored
2855 by the optimized code of the local exec model. Do nothing
2856 and the value will turn out zero. */
2857 continue;
2858
2859 if (htab->sgot == NULL)
2860 abort ();
2861
2862 off = htab->tls_ldm_got.offset;
2863 if (off & 1)
2864 off &= ~1;
2865 else
2866 {
2867 Elf_Internal_Rela outrel;
2868 bfd_byte *loc;
2869
2870 if (htab->srelgot == NULL)
2871 abort ();
2872
2873 outrel.r_offset = (htab->sgot->output_section->vma
2874 + htab->sgot->output_offset + off);
2875
2876 bfd_put_32 (output_bfd, 0,
2877 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2878 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD);
2879 outrel.r_addend = 0;
2880 loc = htab->srelgot->contents;
2881 loc += htab->srelgot->reloc_count++
2882 * sizeof (Elf32_External_Rela);
2883 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2884 htab->tls_ldm_got.offset |= 1;
2885 }
2886 relocation = htab->sgot->output_offset + off;
2887 unresolved_reloc = FALSE;
2888 break;
2889
2890 case R_390_TLS_LE32:
2891 if (info->shared)
2892 {
2893 /* Linking a shared library with non-fpic code requires
2894 a R_390_TLS_TPOFF relocation. */
2895 Elf_Internal_Rela outrel;
2896 asection *sreloc;
2897 bfd_byte *loc;
2898 int indx;
2899
2900 outrel.r_offset = rel->r_offset
2901 + input_section->output_section->vma
2902 + input_section->output_offset;
2903 if (h != NULL && h->dynindx != -1)
2904 indx = h->dynindx;
2905 else
2906 indx = 0;
2907 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF);
2908 if (indx == 0)
2909 outrel.r_addend = relocation - dtpoff_base (info);
2910 else
2911 outrel.r_addend = 0;
2912 sreloc = elf_section_data (input_section)->sreloc;
2913 if (sreloc == NULL)
2914 abort ();
2915 loc = sreloc->contents;
2916 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2917 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2918 }
2919 else
2920 {
2921 BFD_ASSERT (! unresolved_reloc);
2922 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2923 contents + rel->r_offset);
2924 }
2925 continue;
2926
2927 case R_390_TLS_LDO32:
2928 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2929 relocation -= dtpoff_base (info);
2930 else
2931 /* When converting LDO to LE, we must negate. */
2932 relocation = -tpoff (info, relocation);
2933 break;
2934
2935 /* Relocations for tls instructions. */
2936 case R_390_TLS_LOAD:
2937 case R_390_TLS_GDCALL:
2938 case R_390_TLS_LDCALL:
2939 tls_type = GOT_UNKNOWN;
2940 if (h == NULL && local_got_offsets)
2941 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2942 else if (h != NULL)
2943 tls_type = elf_s390_hash_entry(h)->tls_type;
2944
2945 if (tls_type == GOT_TLS_GD)
2946 continue;
2947
2948 if (r_type == R_390_TLS_LOAD)
2949 {
2950 if (!info->shared && (h == NULL || h->dynindx == -1))
2951 {
2952 /* IE->LE transition. Four valid cases:
2953 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0
2954 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0
2955 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0
2956 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2957 unsigned int insn, ry;
2958
2959 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2960 ry = 0;
2961 if ((insn & 0xff00f000) == 0x58000000)
2962 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */
2963 ry = (insn & 0x000f0000);
2964 else if ((insn & 0xff0f0000) == 0x58000000)
2965 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */
2966 ry = (insn & 0x0000f000) << 4;
2967 else if ((insn & 0xff00f000) == 0x5800c000)
2968 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */
2969 ry = (insn & 0x000f0000);
2970 else if ((insn & 0xff0f0000) == 0x580c0000)
2971 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
2972 ry = (insn & 0x0000f000) << 4;
2973 else
2974 invalid_tls_insn (input_bfd, input_section, rel);
2975 insn = 0x18000700 | (insn & 0x00f00000) | ry;
2976 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2977 }
2978 }
2979 else if (r_type == R_390_TLS_GDCALL)
2980 {
2981 unsigned int insn;
2982
2983 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
2984 if ((insn & 0xff000fff) != 0x4d000000)
2985 invalid_tls_insn (input_bfd, input_section, rel);
2986 if (!info->shared && (h == NULL || h->dynindx == -1))
2987 /* GD->LE transition.
2988 bas %r14,0(%rx,%r13) -> bc 0,0 */
2989 insn = 0x47000000;
2990 else
2991 /* GD->IE transition.
2992 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */
2993 insn = 0x5822c000;
2994 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
2995 }
2996 else if (r_type == R_390_TLS_LDCALL)
2997 {
2998 if (!info->shared)
2999 {
3000 unsigned int insn;
3001
3002 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3003 if ((insn & 0xff000fff) != 0x4d000000)
3004 invalid_tls_insn (input_bfd, input_section, rel);
3005 /* LD->LE transition.
3006 bas %r14,0(%rx,%r13) -> bc 0,0 */
3007 insn = 0x47000000;
3008 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3009 }
3010 }
3011 continue;
3012
3013 default:
3014 break;
3015 }
3016
3017 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3018 because such sections are not SEC_ALLOC and thus ld.so will
3019 not process them. */
3020 if (unresolved_reloc
3021 && !((input_section->flags & SEC_DEBUGGING) != 0
3022 && h->def_dynamic))
3023 (*_bfd_error_handler)
3024 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3025 input_bfd,
3026 input_section,
3027 (long) rel->r_offset,
3028 howto->name,
3029 h->root.root.string);
3030
3031 if (r_type == R_390_20
3032 || r_type == R_390_GOT20
3033 || r_type == R_390_GOTPLT20
3034 || r_type == R_390_TLS_GOTIE20)
3035 {
3036 relocation += rel->r_addend;
3037 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3038 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3039 contents, rel->r_offset,
3040 relocation, 0);
3041 }
3042 else
3043 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3044 contents, rel->r_offset,
3045 relocation, rel->r_addend);
3046
3047 if (r != bfd_reloc_ok)
3048 {
3049 const char *name;
3050
3051 if (h != NULL)
3052 name = h->root.root.string;
3053 else
3054 {
3055 name = bfd_elf_string_from_elf_section (input_bfd,
3056 symtab_hdr->sh_link,
3057 sym->st_name);
3058 if (name == NULL)
3059 return FALSE;
3060 if (*name == '\0')
3061 name = bfd_section_name (input_bfd, sec);
3062 }
3063
3064 if (r == bfd_reloc_overflow)
3065 {
3066
3067 if (! ((*info->callbacks->reloc_overflow)
3068 (info, (h ? &h->root : NULL), name, howto->name,
3069 (bfd_vma) 0, input_bfd, input_section,
3070 rel->r_offset)))
3071 return FALSE;
3072 }
3073 else
3074 {
3075 (*_bfd_error_handler)
3076 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3077 input_bfd, input_section,
3078 (long) rel->r_offset, name, (int) r);
3079 return FALSE;
3080 }
3081 }
3082 }
3083
3084 return TRUE;
3085 }
3086
3087 /* Finish up dynamic symbol handling. We set the contents of various
3088 dynamic sections here. */
3089
3090 static bfd_boolean
3091 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3092 bfd *output_bfd;
3093 struct bfd_link_info *info;
3094 struct elf_link_hash_entry *h;
3095 Elf_Internal_Sym *sym;
3096 {
3097 struct elf_s390_link_hash_table *htab;
3098
3099 htab = elf_s390_hash_table (info);
3100
3101 if (h->plt.offset != (bfd_vma) -1)
3102 {
3103 bfd_vma plt_index;
3104 bfd_vma got_offset;
3105 Elf_Internal_Rela rela;
3106 bfd_byte *loc;
3107 bfd_vma relative_offset;
3108
3109 /* This symbol has an entry in the procedure linkage table. Set
3110 it up. */
3111 if (h->dynindx == -1
3112 || htab->splt == NULL
3113 || htab->sgotplt == NULL
3114 || htab->srelplt == NULL)
3115 abort ();
3116
3117 /* Calc. index no.
3118 Current offset - size first entry / entry size. */
3119 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3120
3121 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
3122 addr & GOT addr. */
3123 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3124
3125 /* S390 uses halfwords for relative branch calc! */
3126 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
3127 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
3128 /* If offset is > 32768, branch to a previous branch
3129 390 can only handle +-64 K jumps. */
3130 if ( -32768 > (int) relative_offset )
3131 relative_offset
3132 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3133
3134 /* Fill in the entry in the procedure linkage table. */
3135 if (!info->shared)
3136 {
3137 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3138 htab->splt->contents + h->plt.offset);
3139 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3140 htab->splt->contents + h->plt.offset + 4);
3141 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3142 htab->splt->contents + h->plt.offset + 8);
3143 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3144 htab->splt->contents + h->plt.offset + 12);
3145 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3146 htab->splt->contents + h->plt.offset + 16);
3147 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3148 htab->splt->contents + h->plt.offset + 20);
3149 bfd_put_32 (output_bfd,
3150 (htab->sgotplt->output_section->vma
3151 + htab->sgotplt->output_offset
3152 + got_offset),
3153 htab->splt->contents + h->plt.offset + 24);
3154 }
3155 else if (got_offset < 4096)
3156 {
3157 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD0 + got_offset,
3158 htab->splt->contents + h->plt.offset);
3159 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD1,
3160 htab->splt->contents + h->plt.offset + 4);
3161 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD2,
3162 htab->splt->contents + h->plt.offset + 8);
3163 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD3,
3164 htab->splt->contents + h->plt.offset + 12);
3165 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC12_ENTRY_WORD4,
3166 htab->splt->contents + h->plt.offset + 16);
3167 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3168 htab->splt->contents + h->plt.offset + 20);
3169 bfd_put_32 (output_bfd, (bfd_vma) 0,
3170 htab->splt->contents + h->plt.offset + 24);
3171 }
3172 else if (got_offset < 32768)
3173 {
3174 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD0 + got_offset,
3175 htab->splt->contents + h->plt.offset);
3176 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD1,
3177 htab->splt->contents + h->plt.offset + 4);
3178 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD2,
3179 htab->splt->contents + h->plt.offset + 8);
3180 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD3,
3181 htab->splt->contents + h->plt.offset + 12);
3182 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC16_ENTRY_WORD4,
3183 htab->splt->contents + h->plt.offset + 16);
3184 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3185 htab->splt->contents + h->plt.offset + 20);
3186 bfd_put_32 (output_bfd, (bfd_vma) 0,
3187 htab->splt->contents + h->plt.offset + 24);
3188 }
3189 else
3190 {
3191 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD0,
3192 htab->splt->contents + h->plt.offset);
3193 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD1,
3194 htab->splt->contents + h->plt.offset + 4);
3195 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD2,
3196 htab->splt->contents + h->plt.offset + 8);
3197 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD3,
3198 htab->splt->contents + h->plt.offset + 12);
3199 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_ENTRY_WORD4,
3200 htab->splt->contents + h->plt.offset + 16);
3201 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3202 htab->splt->contents + h->plt.offset + 20);
3203 bfd_put_32 (output_bfd, got_offset,
3204 htab->splt->contents + h->plt.offset + 24);
3205 }
3206 /* Insert offset into reloc. table here. */
3207 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
3208 htab->splt->contents + h->plt.offset + 28);
3209
3210 /* Fill in the entry in the global offset table.
3211 Points to instruction after GOT offset. */
3212 bfd_put_32 (output_bfd,
3213 (htab->splt->output_section->vma
3214 + htab->splt->output_offset
3215 + h->plt.offset
3216 + 12),
3217 htab->sgotplt->contents + got_offset);
3218
3219 /* Fill in the entry in the .rela.plt section. */
3220 rela.r_offset = (htab->sgotplt->output_section->vma
3221 + htab->sgotplt->output_offset
3222 + got_offset);
3223 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3224 rela.r_addend = 0;
3225 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rela);
3226 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3227
3228 if (!h->def_regular)
3229 {
3230 /* Mark the symbol as undefined, rather than as defined in
3231 the .plt section. Leave the value alone. This is a clue
3232 for the dynamic linker, to make function pointer
3233 comparisons work between an application and shared
3234 library. */
3235 sym->st_shndx = SHN_UNDEF;
3236 }
3237 }
3238
3239 if (h->got.offset != (bfd_vma) -1
3240 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3241 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3242 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3243 {
3244 Elf_Internal_Rela rela;
3245 bfd_byte *loc;
3246
3247 /* This symbol has an entry in the global offset table. Set it
3248 up. */
3249
3250 if (htab->sgot == NULL || htab->srelgot == NULL)
3251 abort ();
3252
3253 rela.r_offset = (htab->sgot->output_section->vma
3254 + htab->sgot->output_offset
3255 + (h->got.offset &~ (bfd_vma) 1));
3256
3257 /* If this is a static link, or it is a -Bsymbolic link and the
3258 symbol is defined locally or was forced to be local because
3259 of a version file, we just want to emit a RELATIVE reloc.
3260 The entry in the global offset table will already have been
3261 initialized in the relocate_section function. */
3262 if (info->shared
3263 && (info->symbolic
3264 || h->dynindx == -1
3265 || h->forced_local)
3266 && h->def_regular)
3267 {
3268 BFD_ASSERT((h->got.offset & 1) != 0);
3269 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
3270 rela.r_addend = (h->root.u.def.value
3271 + h->root.u.def.section->output_section->vma
3272 + h->root.u.def.section->output_offset);
3273 }
3274 else
3275 {
3276 BFD_ASSERT((h->got.offset & 1) == 0);
3277 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3278 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
3279 rela.r_addend = 0;
3280 }
3281
3282 loc = htab->srelgot->contents;
3283 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3284 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3285 }
3286
3287 if (h->needs_copy)
3288 {
3289 Elf_Internal_Rela rela;
3290 bfd_byte *loc;
3291
3292 /* This symbols needs a copy reloc. Set it up. */
3293
3294 if (h->dynindx == -1
3295 || (h->root.type != bfd_link_hash_defined
3296 && h->root.type != bfd_link_hash_defweak)
3297 || htab->srelbss == NULL)
3298 abort ();
3299
3300 rela.r_offset = (h->root.u.def.value
3301 + h->root.u.def.section->output_section->vma
3302 + h->root.u.def.section->output_offset);
3303 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
3304 rela.r_addend = 0;
3305 loc = htab->srelbss->contents;
3306 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rela);
3307 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3308 }
3309
3310 /* Mark some specially defined symbols as absolute. */
3311 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3312 || h == htab->elf.hgot
3313 || h == htab->elf.hplt)
3314 sym->st_shndx = SHN_ABS;
3315
3316 return TRUE;
3317 }
3318
3319 /* Used to decide how to sort relocs in an optimal manner for the
3320 dynamic linker, before writing them out. */
3321
3322 static enum elf_reloc_type_class
3323 elf_s390_reloc_type_class (rela)
3324 const Elf_Internal_Rela *rela;
3325 {
3326 switch ((int) ELF32_R_TYPE (rela->r_info))
3327 {
3328 case R_390_RELATIVE:
3329 return reloc_class_relative;
3330 case R_390_JMP_SLOT:
3331 return reloc_class_plt;
3332 case R_390_COPY:
3333 return reloc_class_copy;
3334 default:
3335 return reloc_class_normal;
3336 }
3337 }
3338
3339 /* Finish up the dynamic sections. */
3340
3341 static bfd_boolean
3342 elf_s390_finish_dynamic_sections (output_bfd, info)
3343 bfd *output_bfd;
3344 struct bfd_link_info *info;
3345 {
3346 struct elf_s390_link_hash_table *htab;
3347 bfd *dynobj;
3348 asection *sdyn;
3349
3350 htab = elf_s390_hash_table (info);
3351 dynobj = htab->elf.dynobj;
3352 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3353
3354 if (htab->elf.dynamic_sections_created)
3355 {
3356 Elf32_External_Dyn *dyncon, *dynconend;
3357
3358 if (sdyn == NULL || htab->sgot == NULL)
3359 abort ();
3360
3361 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3362 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3363 for (; dyncon < dynconend; dyncon++)
3364 {
3365 Elf_Internal_Dyn dyn;
3366 asection *s;
3367
3368 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3369
3370 switch (dyn.d_tag)
3371 {
3372 default:
3373 continue;
3374
3375 case DT_PLTGOT:
3376 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3377 break;
3378
3379 case DT_JMPREL:
3380 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3381 break;
3382
3383 case DT_PLTRELSZ:
3384 s = htab->srelplt->output_section;
3385 dyn.d_un.d_val = s->size;
3386 break;
3387 }
3388
3389 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3390 }
3391
3392 /* Fill in the special first entry in the procedure linkage table. */
3393 if (htab->splt && htab->splt->size > 0)
3394 {
3395 memset (htab->splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
3396 if (info->shared)
3397 {
3398 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD0,
3399 htab->splt->contents );
3400 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD1,
3401 htab->splt->contents +4 );
3402 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD2,
3403 htab->splt->contents +8 );
3404 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD3,
3405 htab->splt->contents +12 );
3406 bfd_put_32 (output_bfd, (bfd_vma) PLT_PIC_FIRST_ENTRY_WORD4,
3407 htab->splt->contents +16 );
3408 }
3409 else
3410 {
3411 bfd_put_32 (output_bfd, (bfd_vma)PLT_FIRST_ENTRY_WORD0,
3412 htab->splt->contents );
3413 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3414 htab->splt->contents +4 );
3415 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD2,
3416 htab->splt->contents +8 );
3417 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3418 htab->splt->contents +12 );
3419 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3420 htab->splt->contents +16 );
3421 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3422 htab->splt->contents +20 );
3423 bfd_put_32 (output_bfd,
3424 htab->sgotplt->output_section->vma
3425 + htab->sgotplt->output_offset,
3426 htab->splt->contents + 24);
3427 }
3428 elf_section_data (htab->splt->output_section)
3429 ->this_hdr.sh_entsize = 4;
3430 }
3431
3432 }
3433
3434 if (htab->sgotplt)
3435 {
3436 /* Fill in the first three entries in the global offset table. */
3437 if (htab->sgotplt->size > 0)
3438 {
3439 bfd_put_32 (output_bfd,
3440 (sdyn == NULL ? (bfd_vma) 0
3441 : sdyn->output_section->vma + sdyn->output_offset),
3442 htab->sgotplt->contents);
3443 /* One entry for shared object struct ptr. */
3444 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4);
3445 /* One entry for _dl_runtime_resolve. */
3446 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3447 }
3448
3449 elf_section_data (htab->sgotplt->output_section)
3450 ->this_hdr.sh_entsize = 4;
3451 }
3452 return TRUE;
3453 }
3454
3455 static bfd_boolean
3456 elf_s390_grok_prstatus (abfd, note)
3457 bfd * abfd;
3458 Elf_Internal_Note * note;
3459 {
3460 int offset;
3461 unsigned int size;
3462
3463 switch (note->descsz)
3464 {
3465 default:
3466 return FALSE;
3467
3468 case 224: /* S/390 Linux. */
3469 /* pr_cursig */
3470 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
3471
3472 /* pr_pid */
3473 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
3474
3475 /* pr_reg */
3476 offset = 72;
3477 size = 144;
3478 break;
3479 }
3480
3481 /* Make a ".reg/999" section. */
3482 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3483 size, note->descpos + offset);
3484 }
3485
3486 /* Return address for Ith PLT stub in section PLT, for relocation REL
3487 or (bfd_vma) -1 if it should not be included. */
3488
3489 static bfd_vma
3490 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3491 const arelent *rel ATTRIBUTE_UNUSED)
3492 {
3493 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3494 }
3495
3496
3497 #define TARGET_BIG_SYM bfd_elf32_s390_vec
3498 #define TARGET_BIG_NAME "elf32-s390"
3499 #define ELF_ARCH bfd_arch_s390
3500 #define ELF_MACHINE_CODE EM_S390
3501 #define ELF_MACHINE_ALT1 EM_S390_OLD
3502 #define ELF_MAXPAGESIZE 0x1000
3503
3504 #define elf_backend_can_gc_sections 1
3505 #define elf_backend_can_refcount 1
3506 #define elf_backend_want_got_plt 1
3507 #define elf_backend_plt_readonly 1
3508 #define elf_backend_want_plt_sym 0
3509 #define elf_backend_got_header_size 12
3510 #define elf_backend_rela_normal 1
3511
3512 #define elf_info_to_howto elf_s390_info_to_howto
3513
3514 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
3515 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
3516 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3517
3518 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3519 #define elf_backend_check_relocs elf_s390_check_relocs
3520 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3521 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3522 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3523 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3524 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3525 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3526 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3527 #define elf_backend_relocate_section elf_s390_relocate_section
3528 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3529 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3530 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
3531 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3532
3533 #define bfd_elf32_mkobject elf_s390_mkobject
3534 #define elf_backend_object_p elf_s390_object_p
3535
3536 #include "elf32-target.h"
GDB Binutils - Deliverables
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