?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
2011-05-18 Tristan Gingold <gingold@adacore.com>
[binutils.git] / bfd / elf64-s390.c
blob671cb93a4a5aeaf1e1eb500ba4d8463e798e0e4a
1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
3 2010 Free Software Foundation, Inc.
4 Contributed Martin Schwidefsky (schwidefsky@de.ibm.com).
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28
29 static reloc_howto_type *elf_s390_reloc_type_lookup
30 PARAMS ((bfd *, bfd_reloc_code_real_type));
31 static void elf_s390_info_to_howto
32 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
33 static bfd_boolean elf_s390_is_local_label_name
34 PARAMS ((bfd *, const char *));
35 static struct bfd_hash_entry *link_hash_newfunc
36 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
37 static struct bfd_link_hash_table *elf_s390_link_hash_table_create
38 PARAMS ((bfd *));
39 static bfd_boolean create_got_section
40 PARAMS((bfd *, struct bfd_link_info *));
41 static bfd_boolean elf_s390_create_dynamic_sections
42 PARAMS((bfd *, struct bfd_link_info *));
43 static void elf_s390_copy_indirect_symbol
44 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *,
45 struct elf_link_hash_entry *));
46 static bfd_boolean elf_s390_check_relocs
47 PARAMS ((bfd *, struct bfd_link_info *, asection *,
48 const Elf_Internal_Rela *));
49 struct elf_s390_link_hash_entry;
50 static void elf_s390_adjust_gotplt
51 PARAMS ((struct elf_s390_link_hash_entry *));
52 static bfd_boolean elf_s390_adjust_dynamic_symbol
53 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
54 static bfd_boolean allocate_dynrelocs
55 PARAMS ((struct elf_link_hash_entry *, PTR));
56 static bfd_boolean readonly_dynrelocs
57 PARAMS ((struct elf_link_hash_entry *, PTR));
58 static bfd_boolean elf_s390_size_dynamic_sections
59 PARAMS ((bfd *, struct bfd_link_info *));
60 static bfd_boolean elf_s390_relocate_section
61 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
62 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
63 static bfd_boolean elf_s390_finish_dynamic_symbol
64 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
65 Elf_Internal_Sym *));
66 static enum elf_reloc_type_class elf_s390_reloc_type_class
67 PARAMS ((const Elf_Internal_Rela *));
68 static bfd_boolean elf_s390_finish_dynamic_sections
69 PARAMS ((bfd *, struct bfd_link_info *));
70 static bfd_boolean elf_s390_object_p
71 PARAMS ((bfd *));
72 static int elf_s390_tls_transition
73 PARAMS ((struct bfd_link_info *, int, int));
74 static bfd_reloc_status_type s390_tls_reloc
75 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
76 static bfd_vma dtpoff_base
77 PARAMS ((struct bfd_link_info *));
78 static bfd_vma tpoff
79 PARAMS ((struct bfd_link_info *, bfd_vma));
80 static void invalid_tls_insn
81 PARAMS ((bfd *, asection *, Elf_Internal_Rela *));
82 static bfd_reloc_status_type s390_elf_ldisp_reloc
83 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
84
85 #include "elf/s390.h"
86
87 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
88 from smaller values. Start with zero, widen, *then* decrement. */
89 #define MINUS_ONE (((bfd_vma)0) - 1)
90
91 /* The relocation "howto" table. */
92 static reloc_howto_type elf_howto_table[] =
93 {
94 HOWTO (R_390_NONE, /* type */
95 0, /* rightshift */
96 0, /* size (0 = byte, 1 = short, 2 = long) */
97 0, /* bitsize */
98 FALSE, /* pc_relative */
99 0, /* bitpos */
100 complain_overflow_dont, /* complain_on_overflow */
101 bfd_elf_generic_reloc, /* special_function */
102 "R_390_NONE", /* name */
103 FALSE, /* partial_inplace */
104 0, /* src_mask */
105 0, /* dst_mask */
106 FALSE), /* pcrel_offset */
107
108 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
110 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
111 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
112 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
113 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
114 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
115 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
116 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
118 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
120 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
122 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
124 HOWTO(R_390_COPY, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,MINUS_ONE, FALSE),
126 HOWTO(R_390_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,MINUS_ONE, FALSE),
128 HOWTO(R_390_JMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,MINUS_ONE, FALSE),
130 HOWTO(R_390_RELATIVE, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,MINUS_ONE, FALSE),
132 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,MINUS_ONE, FALSE),
134 HOWTO(R_390_GOTPC, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
135 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,MINUS_ONE, TRUE),
136 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
137 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
138 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
140 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
142 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
143 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
144 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
146 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
148 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,MINUS_ONE, TRUE),
150 HOWTO(R_390_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_390_64", FALSE, 0,MINUS_ONE, FALSE),
152 HOWTO(R_390_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
153 bfd_elf_generic_reloc, "R_390_PC64", FALSE, 0,MINUS_ONE, TRUE),
154 HOWTO(R_390_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
155 bfd_elf_generic_reloc, "R_390_GOT64", FALSE, 0,MINUS_ONE, FALSE),
156 HOWTO(R_390_PLT64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
157 bfd_elf_generic_reloc, "R_390_PLT64", FALSE, 0,MINUS_ONE, TRUE),
158 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
159 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,MINUS_ONE, TRUE),
160 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
161 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
162 HOWTO(R_390_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
163 bfd_elf_generic_reloc, "R_390_GOTOFF64", FALSE, 0,MINUS_ONE, FALSE),
164 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
165 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
166 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
167 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
168 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
169 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
170 HOWTO(R_390_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
171 bfd_elf_generic_reloc, "R_390_GOTPLT64", FALSE, 0,MINUS_ONE, FALSE),
172 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
173 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,MINUS_ONE, TRUE),
174 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
175 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
176 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
177 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
178 HOWTO(R_390_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
179 bfd_elf_generic_reloc, "R_390_PLTOFF64", FALSE, 0,MINUS_ONE, FALSE),
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 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */
187 HOWTO(R_390_TLS_GD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
188 bfd_elf_generic_reloc, "R_390_TLS_GD64", FALSE, 0, MINUS_ONE, FALSE),
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 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */
192 HOWTO(R_390_TLS_GOTIE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
193 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", FALSE, 0, MINUS_ONE, FALSE),
194 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */
195 HOWTO(R_390_TLS_LDM64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
196 bfd_elf_generic_reloc, "R_390_TLS_LDM64", FALSE, 0, MINUS_ONE, FALSE),
197 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */
198 HOWTO(R_390_TLS_IE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
199 bfd_elf_generic_reloc, "R_390_TLS_IE64", FALSE, 0, MINUS_ONE, FALSE),
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, MINUS_ONE, TRUE),
202 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */
203 HOWTO(R_390_TLS_LE64, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
204 bfd_elf_generic_reloc, "R_390_TLS_LE64", FALSE, 0, MINUS_ONE, FALSE),
205 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */
206 HOWTO(R_390_TLS_LDO64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
207 bfd_elf_generic_reloc, "R_390_TLS_LDO64", FALSE, 0, MINUS_ONE, FALSE),
208 HOWTO(R_390_TLS_DTPMOD, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
209 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, MINUS_ONE, FALSE),
210 HOWTO(R_390_TLS_DTPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
211 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, MINUS_ONE, FALSE),
212 HOWTO(R_390_TLS_TPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
213 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, MINUS_ONE, 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 elf64_s390_vtinherit_howto =
226 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
227 static reloc_howto_type elf64_s390_vtentry_howto =
228 HOWTO (R_390_GNU_VTENTRY, 0,4,0,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_64:
284 return &elf_howto_table[(int) R_390_64];
285 case BFD_RELOC_64_PCREL:
286 return &elf_howto_table[(int) R_390_PC64];
287 case BFD_RELOC_390_GOT64:
288 return &elf_howto_table[(int) R_390_GOT64];
289 case BFD_RELOC_390_PLT64:
290 return &elf_howto_table[(int) R_390_PLT64];
291 case BFD_RELOC_390_GOTENT:
292 return &elf_howto_table[(int) R_390_GOTENT];
293 case BFD_RELOC_16_GOTOFF:
294 return &elf_howto_table[(int) R_390_GOTOFF16];
295 case BFD_RELOC_390_GOTOFF64:
296 return &elf_howto_table[(int) R_390_GOTOFF64];
297 case BFD_RELOC_390_GOTPLT12:
298 return &elf_howto_table[(int) R_390_GOTPLT12];
299 case BFD_RELOC_390_GOTPLT16:
300 return &elf_howto_table[(int) R_390_GOTPLT16];
301 case BFD_RELOC_390_GOTPLT32:
302 return &elf_howto_table[(int) R_390_GOTPLT32];
303 case BFD_RELOC_390_GOTPLT64:
304 return &elf_howto_table[(int) R_390_GOTPLT64];
305 case BFD_RELOC_390_GOTPLTENT:
306 return &elf_howto_table[(int) R_390_GOTPLTENT];
307 case BFD_RELOC_390_PLTOFF16:
308 return &elf_howto_table[(int) R_390_PLTOFF16];
309 case BFD_RELOC_390_PLTOFF32:
310 return &elf_howto_table[(int) R_390_PLTOFF32];
311 case BFD_RELOC_390_PLTOFF64:
312 return &elf_howto_table[(int) R_390_PLTOFF64];
313 case BFD_RELOC_390_TLS_LOAD:
314 return &elf_howto_table[(int) R_390_TLS_LOAD];
315 case BFD_RELOC_390_TLS_GDCALL:
316 return &elf_howto_table[(int) R_390_TLS_GDCALL];
317 case BFD_RELOC_390_TLS_LDCALL:
318 return &elf_howto_table[(int) R_390_TLS_LDCALL];
319 case BFD_RELOC_390_TLS_GD64:
320 return &elf_howto_table[(int) R_390_TLS_GD64];
321 case BFD_RELOC_390_TLS_GOTIE12:
322 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
323 case BFD_RELOC_390_TLS_GOTIE64:
324 return &elf_howto_table[(int) R_390_TLS_GOTIE64];
325 case BFD_RELOC_390_TLS_LDM64:
326 return &elf_howto_table[(int) R_390_TLS_LDM64];
327 case BFD_RELOC_390_TLS_IE64:
328 return &elf_howto_table[(int) R_390_TLS_IE64];
329 case BFD_RELOC_390_TLS_IEENT:
330 return &elf_howto_table[(int) R_390_TLS_IEENT];
331 case BFD_RELOC_390_TLS_LE64:
332 return &elf_howto_table[(int) R_390_TLS_LE64];
333 case BFD_RELOC_390_TLS_LDO64:
334 return &elf_howto_table[(int) R_390_TLS_LDO64];
335 case BFD_RELOC_390_TLS_DTPMOD:
336 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
337 case BFD_RELOC_390_TLS_DTPOFF:
338 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
339 case BFD_RELOC_390_TLS_TPOFF:
340 return &elf_howto_table[(int) R_390_TLS_TPOFF];
341 case BFD_RELOC_390_20:
342 return &elf_howto_table[(int) R_390_20];
343 case BFD_RELOC_390_GOT20:
344 return &elf_howto_table[(int) R_390_GOT20];
345 case BFD_RELOC_390_GOTPLT20:
346 return &elf_howto_table[(int) R_390_GOTPLT20];
347 case BFD_RELOC_390_TLS_GOTIE20:
348 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
349 case BFD_RELOC_VTABLE_INHERIT:
350 return &elf64_s390_vtinherit_howto;
351 case BFD_RELOC_VTABLE_ENTRY:
352 return &elf64_s390_vtentry_howto;
353 default:
354 break;
355 }
356 return 0;
357 }
358
359 static reloc_howto_type *
360 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
361 const char *r_name)
362 {
363 unsigned int i;
364
365 for (i = 0;
366 i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]);
367 i++)
368 if (elf_howto_table[i].name != NULL
369 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
370 return &elf_howto_table[i];
371
372 if (strcasecmp (elf64_s390_vtinherit_howto.name, r_name) == 0)
373 return &elf64_s390_vtinherit_howto;
374 if (strcasecmp (elf64_s390_vtentry_howto.name, r_name) == 0)
375 return &elf64_s390_vtentry_howto;
376
377 return NULL;
378 }
379
380 /* We need to use ELF64_R_TYPE so we have our own copy of this function,
381 and elf64-s390.c has its own copy. */
382
383 static void
384 elf_s390_info_to_howto (abfd, cache_ptr, dst)
385 bfd *abfd ATTRIBUTE_UNUSED;
386 arelent *cache_ptr;
387 Elf_Internal_Rela *dst;
388 {
389 unsigned int r_type = ELF64_R_TYPE(dst->r_info);
390 switch (r_type)
391 {
392 case R_390_GNU_VTINHERIT:
393 cache_ptr->howto = &elf64_s390_vtinherit_howto;
394 break;
395
396 case R_390_GNU_VTENTRY:
397 cache_ptr->howto = &elf64_s390_vtentry_howto;
398 break;
399
400 default:
401 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
402 {
403 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
404 abfd, (int) r_type);
405 r_type = R_390_NONE;
406 }
407 cache_ptr->howto = &elf_howto_table[r_type];
408 }
409 }
410
411 /* A relocation function which doesn't do anything. */
412 static bfd_reloc_status_type
413 s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section,
414 output_bfd, error_message)
415 bfd *abfd ATTRIBUTE_UNUSED;
416 arelent *reloc_entry;
417 asymbol *symbol ATTRIBUTE_UNUSED;
418 PTR data ATTRIBUTE_UNUSED;
419 asection *input_section;
420 bfd *output_bfd;
421 char **error_message ATTRIBUTE_UNUSED;
422 {
423 if (output_bfd)
424 reloc_entry->address += input_section->output_offset;
425 return bfd_reloc_ok;
426 }
427
428 /* Handle the large displacement relocs. */
429 static bfd_reloc_status_type
430 s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section,
431 output_bfd, error_message)
432 bfd *abfd;
433 arelent *reloc_entry;
434 asymbol *symbol;
435 PTR data;
436 asection *input_section;
437 bfd *output_bfd;
438 char **error_message ATTRIBUTE_UNUSED;
439 {
440 reloc_howto_type *howto = reloc_entry->howto;
441 bfd_vma relocation;
442 bfd_vma insn;
443
444 if (output_bfd != (bfd *) NULL
445 && (symbol->flags & BSF_SECTION_SYM) == 0
446 && (! howto->partial_inplace
447 || reloc_entry->addend == 0))
448 {
449 reloc_entry->address += input_section->output_offset;
450 return bfd_reloc_ok;
451 }
452 if (output_bfd != NULL)
453 return bfd_reloc_continue;
454
455 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
456 return bfd_reloc_outofrange;
457
458 relocation = (symbol->value
459 + symbol->section->output_section->vma
460 + symbol->section->output_offset);
461 relocation += reloc_entry->addend;
462 if (howto->pc_relative)
463 {
464 relocation -= (input_section->output_section->vma
465 + input_section->output_offset);
466 relocation -= reloc_entry->address;
467 }
468
469 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
470 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
471 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
472
473 if ((bfd_signed_vma) relocation < - 0x80000
474 || (bfd_signed_vma) relocation > 0x7ffff)
475 return bfd_reloc_overflow;
476 else
477 return bfd_reloc_ok;
478 }
479
480 static bfd_boolean
481 elf_s390_is_local_label_name (abfd, name)
482 bfd *abfd;
483 const char *name;
484 {
485 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
486 return TRUE;
487
488 return _bfd_elf_is_local_label_name (abfd, name);
489 }
490
491 /* Functions for the 390 ELF linker. */
492
493 /* The name of the dynamic interpreter. This is put in the .interp
494 section. */
495
496 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
497
498 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
499 copying dynamic variables from a shared lib into an app's dynbss
500 section, and instead use a dynamic relocation to point into the
501 shared lib. */
502 #define ELIMINATE_COPY_RELOCS 1
503
504 /* The size in bytes of the first entry in the procedure linkage table. */
505 #define PLT_FIRST_ENTRY_SIZE 32
506 /* The size in bytes of an entry in the procedure linkage table. */
507 #define PLT_ENTRY_SIZE 32
508
509 #define GOT_ENTRY_SIZE 8
510
511 /* The first three entries in a procedure linkage table are reserved,
512 and the initial contents are unimportant (we zero them out).
513 Subsequent entries look like this. See the SVR4 ABI 386
514 supplement to see how this works. */
515
516 /* For the s390, simple addr offset can only be 0 - 4096.
517 To use the full 16777216 TB address space, several instructions
518 are needed to load an address in a register and execute
519 a branch( or just saving the address)
520
521 Furthermore, only r 0 and 1 are free to use!!! */
522
523 /* The first 3 words in the GOT are then reserved.
524 Word 0 is the address of the dynamic table.
525 Word 1 is a pointer to a structure describing the object
526 Word 2 is used to point to the loader entry address.
527
528 The code for PLT entries looks like this:
529
530 The GOT holds the address in the PLT to be executed.
531 The loader then gets:
532 24(15) = Pointer to the structure describing the object.
533 28(15) = Offset in symbol table
534 The loader must then find the module where the function is
535 and insert the address in the GOT.
536
537 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
538 LG 1,0(1) # 6 bytes Load address from GOT in r1
539 BCR 15,1 # 2 bytes Jump to address
540 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
541 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1
542 BRCL 15,-x # 6 bytes Jump to start of PLT
543 .long ? # 4 bytes offset into symbol table
544
545 Total = 32 bytes per PLT entry
546 Fixup at offset 2: relative address to GOT entry
547 Fixup at offset 22: relative branch to PLT0
548 Fixup at offset 28: 32 bit offset into symbol table
549
550 A 32 bit offset into the symbol table is enough. It allows for symbol
551 tables up to a size of 2 gigabyte. A single dynamic object (the main
552 program, any shared library) is limited to 4GB in size and I want to see
553 the program that manages to have a symbol table of more than 2 GB with a
554 total size of at max 4 GB. */
555
556 #define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000
557 #define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310
558 #define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004
559 #define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10
560 #define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c
561 #define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4
562 #define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000
563 #define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000
564
565 /* The first PLT entry pushes the offset into the symbol table
566 from R1 onto the stack at 8(15) and the loader object info
567 at 12(15), loads the loader address in R1 and jumps to it. */
568
569 /* The first entry in the PLT:
570
571 PLT0:
572 STG 1,56(15) # r1 contains the offset into the symbol table
573 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
574 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
575 LG 1,16(1) # get entry address of loader
576 BCR 15,1 # jump to loader
577
578 Fixup at offset 8: relative address to start of GOT. */
579
580 #define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038
581 #define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010
582 #define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000
583 #define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030
584 #define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310
585 #define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004
586 #define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700
587 #define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700
588
589 /* The s390 linker needs to keep track of the number of relocs that it
590 decides to copy as dynamic relocs in check_relocs for each symbol.
591 This is so that it can later discard them if they are found to be
592 unnecessary. We store the information in a field extending the
593 regular ELF linker hash table. */
594
595 struct elf_s390_dyn_relocs
596 {
597 struct elf_s390_dyn_relocs *next;
598
599 /* The input section of the reloc. */
600 asection *sec;
601
602 /* Total number of relocs copied for the input section. */
603 bfd_size_type count;
604
605 /* Number of pc-relative relocs copied for the input section. */
606 bfd_size_type pc_count;
607 };
608
609 /* s390 ELF linker hash entry. */
610
611 struct elf_s390_link_hash_entry
612 {
613 struct elf_link_hash_entry elf;
614
615 /* Track dynamic relocs copied for this symbol. */
616 struct elf_s390_dyn_relocs *dyn_relocs;
617
618 /* Number of GOTPLT references for a function. */
619 bfd_signed_vma gotplt_refcount;
620
621 #define GOT_UNKNOWN 0
622 #define GOT_NORMAL 1
623 #define GOT_TLS_GD 2
624 #define GOT_TLS_IE 3
625 #define GOT_TLS_IE_NLT 3
626 unsigned char tls_type;
627 };
628
629 #define elf_s390_hash_entry(ent) \
630 ((struct elf_s390_link_hash_entry *)(ent))
631
632 /* NOTE: Keep this structure in sync with
633 the one declared in elf32-s390.c. */
634 struct elf_s390_obj_tdata
635 {
636 struct elf_obj_tdata root;
637
638 /* TLS type for each local got entry. */
639 char *local_got_tls_type;
640 };
641
642 #define elf_s390_tdata(abfd) \
643 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
644
645 #define elf_s390_local_got_tls_type(abfd) \
646 (elf_s390_tdata (abfd)->local_got_tls_type)
647
648 #define is_s390_elf(bfd) \
649 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
650 && elf_tdata (bfd) != NULL \
651 && elf_object_id (bfd) == S390_ELF_DATA)
652
653 static bfd_boolean
654 elf_s390_mkobject (bfd *abfd)
655 {
656 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata),
657 S390_ELF_DATA);
658 }
659
660 static bfd_boolean
661 elf_s390_object_p (abfd)
662 bfd *abfd;
663 {
664 /* Set the right machine number for an s390 elf32 file. */
665 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
666 }
667
668 /* s390 ELF linker hash table. */
669
670 struct elf_s390_link_hash_table
671 {
672 struct elf_link_hash_table elf;
673
674 /* Short-cuts to get to dynamic linker sections. */
675 asection *sgot;
676 asection *sgotplt;
677 asection *srelgot;
678 asection *splt;
679 asection *srelplt;
680 asection *sdynbss;
681 asection *srelbss;
682
683 union {
684 bfd_signed_vma refcount;
685 bfd_vma offset;
686 } tls_ldm_got;
687
688 /* Small local sym cache. */
689 struct sym_cache sym_cache;
690 };
691
692 /* Get the s390 ELF linker hash table from a link_info structure. */
693
694 #define elf_s390_hash_table(p) \
695 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
696 == S390_ELF_DATA ? ((struct elf_s390_link_hash_table *) ((p)->hash)) : NULL)
697
698 /* Create an entry in an s390 ELF linker hash table. */
699
700 static struct bfd_hash_entry *
701 link_hash_newfunc (entry, table, string)
702 struct bfd_hash_entry *entry;
703 struct bfd_hash_table *table;
704 const char *string;
705 {
706 /* Allocate the structure if it has not already been allocated by a
707 subclass. */
708 if (entry == NULL)
709 {
710 entry = bfd_hash_allocate (table,
711 sizeof (struct elf_s390_link_hash_entry));
712 if (entry == NULL)
713 return entry;
714 }
715
716 /* Call the allocation method of the superclass. */
717 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
718 if (entry != NULL)
719 {
720 struct elf_s390_link_hash_entry *eh;
721
722 eh = (struct elf_s390_link_hash_entry *) entry;
723 eh->dyn_relocs = NULL;
724 eh->gotplt_refcount = 0;
725 eh->tls_type = GOT_UNKNOWN;
726 }
727
728 return entry;
729 }
730
731 /* Create an s390 ELF linker hash table. */
732
733 static struct bfd_link_hash_table *
734 elf_s390_link_hash_table_create (abfd)
735 bfd *abfd;
736 {
737 struct elf_s390_link_hash_table *ret;
738 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
739
740 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
741 if (ret == NULL)
742 return NULL;
743
744 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
745 sizeof (struct elf_s390_link_hash_entry),
746 S390_ELF_DATA))
747 {
748 free (ret);
749 return NULL;
750 }
751
752 ret->sgot = NULL;
753 ret->sgotplt = NULL;
754 ret->srelgot = NULL;
755 ret->splt = NULL;
756 ret->srelplt = NULL;
757 ret->sdynbss = NULL;
758 ret->srelbss = NULL;
759 ret->tls_ldm_got.refcount = 0;
760 ret->sym_cache.abfd = NULL;
761
762 return &ret->elf.root;
763 }
764
765 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
766 shortcuts to them in our hash table. */
767
768 static bfd_boolean
769 create_got_section (bfd *dynobj,
770 struct bfd_link_info *info)
771 {
772 struct elf_s390_link_hash_table *htab;
773
774 if (! _bfd_elf_create_got_section (dynobj, info))
775 return FALSE;
776
777 htab = elf_s390_hash_table (info);
778 if (htab == NULL)
779 return FALSE;
780
781 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
782 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
783 htab->srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
784 if (!htab->sgot || !htab->sgotplt || !htab->srelgot)
785 abort ();
786 return TRUE;
787 }
788
789 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
790 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
791 hash table. */
792
793 static bfd_boolean
794 elf_s390_create_dynamic_sections (bfd *dynobj,
795 struct bfd_link_info *info)
796 {
797 struct elf_s390_link_hash_table *htab;
798
799 htab = elf_s390_hash_table (info);
800 if (htab == NULL)
801 return FALSE;
802
803 if (!htab->sgot && !create_got_section (dynobj, info))
804 return FALSE;
805
806 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
807 return FALSE;
808
809 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
810 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
811 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
812 if (!info->shared)
813 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
814
815 if (!htab->splt || !htab->srelplt || !htab->sdynbss
816 || (!info->shared && !htab->srelbss))
817 abort ();
818
819 return TRUE;
820 }
821
822 /* Copy the extra info we tack onto an elf_link_hash_entry. */
823
824 static void
825 elf_s390_copy_indirect_symbol (info, dir, ind)
826 struct bfd_link_info *info;
827 struct elf_link_hash_entry *dir, *ind;
828 {
829 struct elf_s390_link_hash_entry *edir, *eind;
830
831 edir = (struct elf_s390_link_hash_entry *) dir;
832 eind = (struct elf_s390_link_hash_entry *) ind;
833
834 if (eind->dyn_relocs != NULL)
835 {
836 if (edir->dyn_relocs != NULL)
837 {
838 struct elf_s390_dyn_relocs **pp;
839 struct elf_s390_dyn_relocs *p;
840
841 /* Add reloc counts against the indirect sym to the direct sym
842 list. Merge any entries against the same section. */
843 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
844 {
845 struct elf_s390_dyn_relocs *q;
846
847 for (q = edir->dyn_relocs; q != NULL; q = q->next)
848 if (q->sec == p->sec)
849 {
850 q->pc_count += p->pc_count;
851 q->count += p->count;
852 *pp = p->next;
853 break;
854 }
855 if (q == NULL)
856 pp = &p->next;
857 }
858 *pp = edir->dyn_relocs;
859 }
860
861 edir->dyn_relocs = eind->dyn_relocs;
862 eind->dyn_relocs = NULL;
863 }
864
865 if (ind->root.type == bfd_link_hash_indirect
866 && dir->got.refcount <= 0)
867 {
868 edir->tls_type = eind->tls_type;
869 eind->tls_type = GOT_UNKNOWN;
870 }
871
872 if (ELIMINATE_COPY_RELOCS
873 && ind->root.type != bfd_link_hash_indirect
874 && dir->dynamic_adjusted)
875 {
876 /* If called to transfer flags for a weakdef during processing
877 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
878 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
879 dir->ref_dynamic |= ind->ref_dynamic;
880 dir->ref_regular |= ind->ref_regular;
881 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
882 dir->needs_plt |= ind->needs_plt;
883 }
884 else
885 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
886 }
887
888 static int
889 elf_s390_tls_transition (info, r_type, is_local)
890 struct bfd_link_info *info;
891 int r_type;
892 int is_local;
893 {
894 if (info->shared)
895 return r_type;
896
897 switch (r_type)
898 {
899 case R_390_TLS_GD64:
900 case R_390_TLS_IE64:
901 if (is_local)
902 return R_390_TLS_LE64;
903 return R_390_TLS_IE64;
904 case R_390_TLS_GOTIE64:
905 if (is_local)
906 return R_390_TLS_LE64;
907 return R_390_TLS_GOTIE64;
908 case R_390_TLS_LDM64:
909 return R_390_TLS_LE64;
910 }
911
912 return r_type;
913 }
914
915 /* Look through the relocs for a section during the first phase, and
916 allocate space in the global offset table or procedure linkage
917 table. */
918
919 static bfd_boolean
920 elf_s390_check_relocs (bfd *abfd,
921 struct bfd_link_info *info,
922 asection *sec,
923 const Elf_Internal_Rela *relocs)
924 {
925 struct elf_s390_link_hash_table *htab;
926 Elf_Internal_Shdr *symtab_hdr;
927 struct elf_link_hash_entry **sym_hashes;
928 const Elf_Internal_Rela *rel;
929 const Elf_Internal_Rela *rel_end;
930 asection *sreloc;
931 bfd_signed_vma *local_got_refcounts;
932 int tls_type, old_tls_type;
933
934 if (info->relocatable)
935 return TRUE;
936
937 BFD_ASSERT (is_s390_elf (abfd));
938
939 htab = elf_s390_hash_table (info);
940 if (htab == NULL)
941 return FALSE;
942
943 symtab_hdr = &elf_symtab_hdr (abfd);
944 sym_hashes = elf_sym_hashes (abfd);
945 local_got_refcounts = elf_local_got_refcounts (abfd);
946
947 sreloc = NULL;
948
949 rel_end = relocs + sec->reloc_count;
950 for (rel = relocs; rel < rel_end; rel++)
951 {
952 unsigned int r_type;
953 unsigned long r_symndx;
954 struct elf_link_hash_entry *h;
955
956 r_symndx = ELF64_R_SYM (rel->r_info);
957
958 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
959 {
960 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
961 abfd,
962 r_symndx);
963 return FALSE;
964 }
965
966 if (r_symndx < symtab_hdr->sh_info)
967 h = NULL;
968 else
969 {
970 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
971 while (h->root.type == bfd_link_hash_indirect
972 || h->root.type == bfd_link_hash_warning)
973 h = (struct elf_link_hash_entry *) h->root.u.i.link;
974 }
975
976 /* Create got section and local_got_refcounts array if they
977 are needed. */
978 r_type = elf_s390_tls_transition (info,
979 ELF64_R_TYPE (rel->r_info),
980 h == NULL);
981 switch (r_type)
982 {
983 case R_390_GOT12:
984 case R_390_GOT16:
985 case R_390_GOT20:
986 case R_390_GOT32:
987 case R_390_GOT64:
988 case R_390_GOTENT:
989 case R_390_GOTPLT12:
990 case R_390_GOTPLT16:
991 case R_390_GOTPLT20:
992 case R_390_GOTPLT32:
993 case R_390_GOTPLT64:
994 case R_390_GOTPLTENT:
995 case R_390_TLS_GD64:
996 case R_390_TLS_GOTIE12:
997 case R_390_TLS_GOTIE20:
998 case R_390_TLS_GOTIE64:
999 case R_390_TLS_IEENT:
1000 case R_390_TLS_IE64:
1001 case R_390_TLS_LDM64:
1002 if (h == NULL
1003 && local_got_refcounts == NULL)
1004 {
1005 bfd_size_type size;
1006
1007 size = symtab_hdr->sh_info;
1008 size *= (sizeof (bfd_signed_vma) + sizeof(char));
1009 local_got_refcounts = ((bfd_signed_vma *)
1010 bfd_zalloc (abfd, size));
1011 if (local_got_refcounts == NULL)
1012 return FALSE;
1013 elf_local_got_refcounts (abfd) = local_got_refcounts;
1014 elf_s390_local_got_tls_type (abfd)
1015 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1016 }
1017 /* Fall through. */
1018 case R_390_GOTOFF16:
1019 case R_390_GOTOFF32:
1020 case R_390_GOTOFF64:
1021 case R_390_GOTPC:
1022 case R_390_GOTPCDBL:
1023 if (htab->sgot == NULL)
1024 {
1025 if (htab->elf.dynobj == NULL)
1026 htab->elf.dynobj = abfd;
1027 if (!create_got_section (htab->elf.dynobj, info))
1028 return FALSE;
1029 }
1030 }
1031
1032 switch (r_type)
1033 {
1034 case R_390_GOTOFF16:
1035 case R_390_GOTOFF32:
1036 case R_390_GOTOFF64:
1037 case R_390_GOTPC:
1038 case R_390_GOTPCDBL:
1039 /* Got is created, nothing to be done. */
1040 break;
1041
1042 case R_390_PLT16DBL:
1043 case R_390_PLT32:
1044 case R_390_PLT32DBL:
1045 case R_390_PLT64:
1046 case R_390_PLTOFF16:
1047 case R_390_PLTOFF32:
1048 case R_390_PLTOFF64:
1049 /* This symbol requires a procedure linkage table entry. We
1050 actually build the entry in adjust_dynamic_symbol,
1051 because this might be a case of linking PIC code which is
1052 never referenced by a dynamic object, in which case we
1053 don't need to generate a procedure linkage table entry
1054 after all. */
1055
1056 /* If this is a local symbol, we resolve it directly without
1057 creating a procedure linkage table entry. */
1058 if (h != NULL)
1059 {
1060 h->needs_plt = 1;
1061 h->plt.refcount += 1;
1062 }
1063 break;
1064
1065 case R_390_GOTPLT12:
1066 case R_390_GOTPLT16:
1067 case R_390_GOTPLT20:
1068 case R_390_GOTPLT32:
1069 case R_390_GOTPLT64:
1070 case R_390_GOTPLTENT:
1071 /* This symbol requires either a procedure linkage table entry
1072 or an entry in the local got. We actually build the entry
1073 in adjust_dynamic_symbol because whether this is really a
1074 global reference can change and with it the fact if we have
1075 to create a plt entry or a local got entry. To be able to
1076 make a once global symbol a local one we have to keep track
1077 of the number of gotplt references that exist for this
1078 symbol. */
1079 if (h != NULL)
1080 {
1081 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1082 h->needs_plt = 1;
1083 h->plt.refcount += 1;
1084 }
1085 else
1086 local_got_refcounts[r_symndx] += 1;
1087 break;
1088
1089 case R_390_TLS_LDM64:
1090 htab->tls_ldm_got.refcount += 1;
1091 break;
1092
1093 case R_390_TLS_IE64:
1094 case R_390_TLS_GOTIE12:
1095 case R_390_TLS_GOTIE20:
1096 case R_390_TLS_GOTIE64:
1097 case R_390_TLS_IEENT:
1098 if (info->shared)
1099 info->flags |= DF_STATIC_TLS;
1100 /* Fall through */
1101
1102 case R_390_GOT12:
1103 case R_390_GOT16:
1104 case R_390_GOT20:
1105 case R_390_GOT32:
1106 case R_390_GOT64:
1107 case R_390_GOTENT:
1108 case R_390_TLS_GD64:
1109 /* This symbol requires a global offset table entry. */
1110 switch (r_type)
1111 {
1112 default:
1113 case R_390_GOT12:
1114 case R_390_GOT16:
1115 case R_390_GOT20:
1116 case R_390_GOT32:
1117 case R_390_GOTENT:
1118 tls_type = GOT_NORMAL;
1119 break;
1120 case R_390_TLS_GD64:
1121 tls_type = GOT_TLS_GD;
1122 break;
1123 case R_390_TLS_IE64:
1124 case R_390_TLS_GOTIE64:
1125 tls_type = GOT_TLS_IE;
1126 break;
1127 case R_390_TLS_GOTIE12:
1128 case R_390_TLS_GOTIE20:
1129 case R_390_TLS_IEENT:
1130 tls_type = GOT_TLS_IE_NLT;
1131 break;
1132 }
1133
1134 if (h != NULL)
1135 {
1136 h->got.refcount += 1;
1137 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1138 }
1139 else
1140 {
1141 local_got_refcounts[r_symndx] += 1;
1142 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1143 }
1144 /* If a TLS symbol is accessed using IE at least once,
1145 there is no point to use dynamic model for it. */
1146 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1147 {
1148 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1149 {
1150 (*_bfd_error_handler)
1151 (_("%B: `%s' accessed both as normal and thread local symbol"),
1152 abfd, h->root.root.string);
1153 return FALSE;
1154 }
1155 if (old_tls_type > tls_type)
1156 tls_type = old_tls_type;
1157 }
1158
1159 if (old_tls_type != tls_type)
1160 {
1161 if (h != NULL)
1162 elf_s390_hash_entry (h)->tls_type = tls_type;
1163 else
1164 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1165 }
1166
1167 if (r_type != R_390_TLS_IE64)
1168 break;
1169 /* Fall through */
1170
1171 case R_390_TLS_LE64:
1172 if (!info->shared)
1173 break;
1174 info->flags |= DF_STATIC_TLS;
1175 /* Fall through */
1176
1177 case R_390_8:
1178 case R_390_16:
1179 case R_390_32:
1180 case R_390_64:
1181 case R_390_PC16:
1182 case R_390_PC16DBL:
1183 case R_390_PC32:
1184 case R_390_PC32DBL:
1185 case R_390_PC64:
1186 if (h != NULL && !info->shared)
1187 {
1188 /* If this reloc is in a read-only section, we might
1189 need a copy reloc. We can't check reliably at this
1190 stage whether the section is read-only, as input
1191 sections have not yet been mapped to output sections.
1192 Tentatively set the flag for now, and correct in
1193 adjust_dynamic_symbol. */
1194 h->non_got_ref = 1;
1195
1196 /* We may need a .plt entry if the function this reloc
1197 refers to is in a shared lib. */
1198 h->plt.refcount += 1;
1199 }
1200
1201 /* If we are creating a shared library, and this is a reloc
1202 against a global symbol, or a non PC relative reloc
1203 against a local symbol, then we need to copy the reloc
1204 into the shared library. However, if we are linking with
1205 -Bsymbolic, we do not need to copy a reloc against a
1206 global symbol which is defined in an object we are
1207 including in the link (i.e., DEF_REGULAR is set). At
1208 this point we have not seen all the input files, so it is
1209 possible that DEF_REGULAR is not set now but will be set
1210 later (it is never cleared). In case of a weak definition,
1211 DEF_REGULAR may be cleared later by a strong definition in
1212 a shared library. We account for that possibility below by
1213 storing information in the relocs_copied field of the hash
1214 table entry. A similar situation occurs when creating
1215 shared libraries and symbol visibility changes render the
1216 symbol local.
1217
1218 If on the other hand, we are creating an executable, we
1219 may need to keep relocations for symbols satisfied by a
1220 dynamic library if we manage to avoid copy relocs for the
1221 symbol. */
1222 if ((info->shared
1223 && (sec->flags & SEC_ALLOC) != 0
1224 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
1225 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
1226 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
1227 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
1228 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
1229 || (h != NULL
1230 && (! SYMBOLIC_BIND (info, h)
1231 || h->root.type == bfd_link_hash_defweak
1232 || !h->def_regular))))
1233 || (ELIMINATE_COPY_RELOCS
1234 && !info->shared
1235 && (sec->flags & SEC_ALLOC) != 0
1236 && h != NULL
1237 && (h->root.type == bfd_link_hash_defweak
1238 || !h->def_regular)))
1239 {
1240 struct elf_s390_dyn_relocs *p;
1241 struct elf_s390_dyn_relocs **head;
1242
1243 /* We must copy these reloc types into the output file.
1244 Create a reloc section in dynobj and make room for
1245 this reloc. */
1246 if (sreloc == NULL)
1247 {
1248 if (htab->elf.dynobj == NULL)
1249 htab->elf.dynobj = abfd;
1250
1251 sreloc = _bfd_elf_make_dynamic_reloc_section
1252 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ TRUE);
1253
1254 if (sreloc == NULL)
1255 return FALSE;
1256 }
1257
1258 /* If this is a global symbol, we count the number of
1259 relocations we need for this symbol. */
1260 if (h != NULL)
1261 {
1262 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1263 }
1264 else
1265 {
1266 /* Track dynamic relocs needed for local syms too.
1267 We really need local syms available to do this
1268 easily. Oh well. */
1269 asection *s;
1270 void *vpp;
1271 Elf_Internal_Sym *isym;
1272
1273 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1274 abfd, r_symndx);
1275 if (isym == NULL)
1276 return FALSE;
1277
1278 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1279 if (s == NULL)
1280 s = sec;
1281
1282 vpp = &elf_section_data (s)->local_dynrel;
1283 head = (struct elf_s390_dyn_relocs **) vpp;
1284 }
1285
1286 p = *head;
1287 if (p == NULL || p->sec != sec)
1288 {
1289 bfd_size_type amt = sizeof *p;
1290 p = ((struct elf_s390_dyn_relocs *)
1291 bfd_alloc (htab->elf.dynobj, amt));
1292 if (p == NULL)
1293 return FALSE;
1294 p->next = *head;
1295 *head = p;
1296 p->sec = sec;
1297 p->count = 0;
1298 p->pc_count = 0;
1299 }
1300
1301 p->count += 1;
1302 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
1303 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1304 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
1305 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
1306 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
1307 p->pc_count += 1;
1308 }
1309 break;
1310
1311 /* This relocation describes the C++ object vtable hierarchy.
1312 Reconstruct it for later use during GC. */
1313 case R_390_GNU_VTINHERIT:
1314 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1315 return FALSE;
1316 break;
1317
1318 /* This relocation describes which C++ vtable entries are actually
1319 used. Record for later use during GC. */
1320 case R_390_GNU_VTENTRY:
1321 BFD_ASSERT (h != NULL);
1322 if (h != NULL
1323 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1324 return FALSE;
1325 break;
1326
1327 default:
1328 break;
1329 }
1330 }
1331
1332 return TRUE;
1333 }
1334
1335 /* Return the section that should be marked against GC for a given
1336 relocation. */
1337
1338 static asection *
1339 elf_s390_gc_mark_hook (asection *sec,
1340 struct bfd_link_info *info,
1341 Elf_Internal_Rela *rel,
1342 struct elf_link_hash_entry *h,
1343 Elf_Internal_Sym *sym)
1344 {
1345 if (h != NULL)
1346 switch (ELF64_R_TYPE (rel->r_info))
1347 {
1348 case R_390_GNU_VTINHERIT:
1349 case R_390_GNU_VTENTRY:
1350 return NULL;
1351 }
1352
1353 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1354 }
1355
1356 /* Update the got entry reference counts for the section being removed. */
1357
1358 static bfd_boolean
1359 elf_s390_gc_sweep_hook (bfd *abfd,
1360 struct bfd_link_info *info,
1361 asection *sec,
1362 const Elf_Internal_Rela *relocs)
1363 {
1364 struct elf_s390_link_hash_table *htab;
1365 Elf_Internal_Shdr *symtab_hdr;
1366 struct elf_link_hash_entry **sym_hashes;
1367 bfd_signed_vma *local_got_refcounts;
1368 const Elf_Internal_Rela *rel, *relend;
1369
1370 if (info->relocatable)
1371 return TRUE;
1372
1373 htab = elf_s390_hash_table (info);
1374 if (htab == NULL)
1375 return FALSE;
1376
1377 elf_section_data (sec)->local_dynrel = NULL;
1378
1379 symtab_hdr = &elf_symtab_hdr (abfd);
1380 sym_hashes = elf_sym_hashes (abfd);
1381 local_got_refcounts = elf_local_got_refcounts (abfd);
1382
1383 relend = relocs + sec->reloc_count;
1384 for (rel = relocs; rel < relend; rel++)
1385 {
1386 unsigned long r_symndx;
1387 unsigned int r_type;
1388 struct elf_link_hash_entry *h = NULL;
1389
1390 r_symndx = ELF64_R_SYM (rel->r_info);
1391 if (r_symndx >= symtab_hdr->sh_info)
1392 {
1393 struct elf_s390_link_hash_entry *eh;
1394 struct elf_s390_dyn_relocs **pp;
1395 struct elf_s390_dyn_relocs *p;
1396
1397 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1398 while (h->root.type == bfd_link_hash_indirect
1399 || h->root.type == bfd_link_hash_warning)
1400 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1401 eh = (struct elf_s390_link_hash_entry *) h;
1402
1403 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1404 if (p->sec == sec)
1405 {
1406 /* Everything must go for SEC. */
1407 *pp = p->next;
1408 break;
1409 }
1410 }
1411
1412 r_type = ELF64_R_TYPE (rel->r_info);
1413 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1414 switch (r_type)
1415 {
1416 case R_390_TLS_LDM64:
1417 if (htab->tls_ldm_got.refcount > 0)
1418 htab->tls_ldm_got.refcount -= 1;
1419 break;
1420
1421 case R_390_TLS_GD64:
1422 case R_390_TLS_IE64:
1423 case R_390_TLS_GOTIE12:
1424 case R_390_TLS_GOTIE20:
1425 case R_390_TLS_GOTIE64:
1426 case R_390_TLS_IEENT:
1427 case R_390_GOT12:
1428 case R_390_GOT16:
1429 case R_390_GOT20:
1430 case R_390_GOT32:
1431 case R_390_GOT64:
1432 case R_390_GOTOFF16:
1433 case R_390_GOTOFF32:
1434 case R_390_GOTOFF64:
1435 case R_390_GOTPC:
1436 case R_390_GOTPCDBL:
1437 case R_390_GOTENT:
1438 if (h != NULL)
1439 {
1440 if (h->got.refcount > 0)
1441 h->got.refcount -= 1;
1442 }
1443 else if (local_got_refcounts != NULL)
1444 {
1445 if (local_got_refcounts[r_symndx] > 0)
1446 local_got_refcounts[r_symndx] -= 1;
1447 }
1448 break;
1449
1450 case R_390_8:
1451 case R_390_12:
1452 case R_390_16:
1453 case R_390_20:
1454 case R_390_32:
1455 case R_390_64:
1456 case R_390_PC16:
1457 case R_390_PC16DBL:
1458 case R_390_PC32:
1459 case R_390_PC32DBL:
1460 case R_390_PC64:
1461 if (info->shared)
1462 break;
1463 /* Fall through */
1464
1465 case R_390_PLT16DBL:
1466 case R_390_PLT32:
1467 case R_390_PLT32DBL:
1468 case R_390_PLT64:
1469 case R_390_PLTOFF16:
1470 case R_390_PLTOFF32:
1471 case R_390_PLTOFF64:
1472 if (h != NULL)
1473 {
1474 if (h->plt.refcount > 0)
1475 h->plt.refcount -= 1;
1476 }
1477 break;
1478
1479 case R_390_GOTPLT12:
1480 case R_390_GOTPLT16:
1481 case R_390_GOTPLT20:
1482 case R_390_GOTPLT32:
1483 case R_390_GOTPLT64:
1484 case R_390_GOTPLTENT:
1485 if (h != NULL)
1486 {
1487 if (h->plt.refcount > 0)
1488 {
1489 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1490 h->plt.refcount -= 1;
1491 }
1492 }
1493 else if (local_got_refcounts != NULL)
1494 {
1495 if (local_got_refcounts[r_symndx] > 0)
1496 local_got_refcounts[r_symndx] -= 1;
1497 }
1498 break;
1499
1500 default:
1501 break;
1502 }
1503 }
1504
1505 return TRUE;
1506 }
1507
1508 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1509 entry but we found we will not create any. Called when we find we will
1510 not have any PLT for this symbol, by for example
1511 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1512 or elf_s390_size_dynamic_sections if no dynamic sections will be
1513 created (we're only linking static objects). */
1514
1515 static void
1516 elf_s390_adjust_gotplt (h)
1517 struct elf_s390_link_hash_entry *h;
1518 {
1519 if (h->elf.root.type == bfd_link_hash_warning)
1520 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1521
1522 if (h->gotplt_refcount <= 0)
1523 return;
1524
1525 /* We simply add the number of gotplt references to the number
1526 * of got references for this symbol. */
1527 h->elf.got.refcount += h->gotplt_refcount;
1528 h->gotplt_refcount = -1;
1529 }
1530
1531 /* Adjust a symbol defined by a dynamic object and referenced by a
1532 regular object. The current definition is in some section of the
1533 dynamic object, but we're not including those sections. We have to
1534 change the definition to something the rest of the link can
1535 understand. */
1536
1537 static bfd_boolean
1538 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
1539 struct elf_link_hash_entry *h)
1540 {
1541 struct elf_s390_link_hash_table *htab;
1542 asection *s;
1543
1544 /* If this is a function, put it in the procedure linkage table. We
1545 will fill in the contents of the procedure linkage table later
1546 (although we could actually do it here). */
1547 if (h->type == STT_FUNC
1548 || h->needs_plt)
1549 {
1550 if (h->plt.refcount <= 0
1551 || SYMBOL_CALLS_LOCAL (info, h)
1552 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1553 && h->root.type == bfd_link_hash_undefweak))
1554 {
1555 /* This case can occur if we saw a PLT32 reloc in an input
1556 file, but the symbol was never referred to by a dynamic
1557 object, or if all references were garbage collected. In
1558 such a case, we don't actually need to build a procedure
1559 linkage table, and we can just do a PC32 reloc instead. */
1560 h->plt.offset = (bfd_vma) -1;
1561 h->needs_plt = 0;
1562 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1563 }
1564
1565 return TRUE;
1566 }
1567 else
1568 /* It's possible that we incorrectly decided a .plt reloc was
1569 needed for an R_390_PC32 reloc to a non-function sym in
1570 check_relocs. We can't decide accurately between function and
1571 non-function syms in check-relocs; Objects loaded later in
1572 the link may change h->type. So fix it now. */
1573 h->plt.offset = (bfd_vma) -1;
1574
1575 /* If this is a weak symbol, and there is a real definition, the
1576 processor independent code will have arranged for us to see the
1577 real definition first, and we can just use the same value. */
1578 if (h->u.weakdef != NULL)
1579 {
1580 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1581 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1582 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1583 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1584 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1585 h->non_got_ref = h->u.weakdef->non_got_ref;
1586 return TRUE;
1587 }
1588
1589 /* This is a reference to a symbol defined by a dynamic object which
1590 is not a function. */
1591
1592 /* If we are creating a shared library, we must presume that the
1593 only references to the symbol are via the global offset table.
1594 For such cases we need not do anything here; the relocations will
1595 be handled correctly by relocate_section. */
1596 if (info->shared)
1597 return TRUE;
1598
1599 /* If there are no references to this symbol that do not use the
1600 GOT, we don't need to generate a copy reloc. */
1601 if (!h->non_got_ref)
1602 return TRUE;
1603
1604 /* If -z nocopyreloc was given, we won't generate them either. */
1605 if (info->nocopyreloc)
1606 {
1607 h->non_got_ref = 0;
1608 return TRUE;
1609 }
1610
1611 if (ELIMINATE_COPY_RELOCS)
1612 {
1613 struct elf_s390_link_hash_entry * eh;
1614 struct elf_s390_dyn_relocs *p;
1615
1616 eh = (struct elf_s390_link_hash_entry *) h;
1617 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1618 {
1619 s = p->sec->output_section;
1620 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1621 break;
1622 }
1623
1624 /* If we didn't find any dynamic relocs in read-only sections, then
1625 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1626 if (p == NULL)
1627 {
1628 h->non_got_ref = 0;
1629 return TRUE;
1630 }
1631 }
1632
1633 if (h->size == 0)
1634 {
1635 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1636 h->root.root.string);
1637 return TRUE;
1638 }
1639
1640 /* We must allocate the symbol in our .dynbss section, which will
1641 become part of the .bss section of the executable. There will be
1642 an entry for this symbol in the .dynsym section. The dynamic
1643 object will contain position independent code, so all references
1644 from the dynamic object to this symbol will go through the global
1645 offset table. The dynamic linker will use the .dynsym entry to
1646 determine the address it must put in the global offset table, so
1647 both the dynamic object and the regular object will refer to the
1648 same memory location for the variable. */
1649
1650 htab = elf_s390_hash_table (info);
1651 if (htab == NULL)
1652 return FALSE;
1653
1654 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1655 copy the initial value out of the dynamic object and into the
1656 runtime process image. */
1657 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1658 {
1659 htab->srelbss->size += sizeof (Elf64_External_Rela);
1660 h->needs_copy = 1;
1661 }
1662
1663 s = htab->sdynbss;
1664
1665 return _bfd_elf_adjust_dynamic_copy (h, s);
1666 }
1667
1668 /* Allocate space in .plt, .got and associated reloc sections for
1669 dynamic relocs. */
1670
1671 static bfd_boolean
1672 allocate_dynrelocs (struct elf_link_hash_entry *h,
1673 void * inf)
1674 {
1675 struct bfd_link_info *info;
1676 struct elf_s390_link_hash_table *htab;
1677 struct elf_s390_link_hash_entry *eh;
1678 struct elf_s390_dyn_relocs *p;
1679
1680 if (h->root.type == bfd_link_hash_indirect)
1681 return TRUE;
1682
1683 if (h->root.type == bfd_link_hash_warning)
1684 /* When warning symbols are created, they **replace** the "real"
1685 entry in the hash table, thus we never get to see the real
1686 symbol in a hash traversal. So look at it now. */
1687 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1688
1689 info = (struct bfd_link_info *) inf;
1690 htab = elf_s390_hash_table (info);
1691 if (htab == NULL)
1692 return FALSE;
1693
1694 if (htab->elf.dynamic_sections_created
1695 && h->plt.refcount > 0)
1696 {
1697 /* Make sure this symbol is output as a dynamic symbol.
1698 Undefined weak syms won't yet be marked as dynamic. */
1699 if (h->dynindx == -1
1700 && !h->forced_local)
1701 {
1702 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1703 return FALSE;
1704 }
1705
1706 if (info->shared
1707 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1708 {
1709 asection *s = htab->splt;
1710
1711 /* If this is the first .plt entry, make room for the special
1712 first entry. */
1713 if (s->size == 0)
1714 s->size += PLT_FIRST_ENTRY_SIZE;
1715
1716 h->plt.offset = s->size;
1717
1718 /* If this symbol is not defined in a regular file, and we are
1719 not generating a shared library, then set the symbol to this
1720 location in the .plt. This is required to make function
1721 pointers compare as equal between the normal executable and
1722 the shared library. */
1723 if (! info->shared
1724 && !h->def_regular)
1725 {
1726 h->root.u.def.section = s;
1727 h->root.u.def.value = h->plt.offset;
1728 }
1729
1730 /* Make room for this entry. */
1731 s->size += PLT_ENTRY_SIZE;
1732
1733 /* We also need to make an entry in the .got.plt section, which
1734 will be placed in the .got section by the linker script. */
1735 htab->sgotplt->size += GOT_ENTRY_SIZE;
1736
1737 /* We also need to make an entry in the .rela.plt section. */
1738 htab->srelplt->size += sizeof (Elf64_External_Rela);
1739 }
1740 else
1741 {
1742 h->plt.offset = (bfd_vma) -1;
1743 h->needs_plt = 0;
1744 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1745 }
1746 }
1747 else
1748 {
1749 h->plt.offset = (bfd_vma) -1;
1750 h->needs_plt = 0;
1751 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1752 }
1753
1754 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to
1755 the binary, we can optimize a bit. IE64 and GOTIE64 get converted
1756 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT
1757 we can save the dynamic TLS relocation. */
1758 if (h->got.refcount > 0
1759 && !info->shared
1760 && h->dynindx == -1
1761 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1762 {
1763 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1764 /* For the GOTIE access without a literal pool entry the offset has
1765 to be stored somewhere. The immediate value in the instruction
1766 is not bit enough so the value is stored in the got. */
1767 {
1768 h->got.offset = htab->sgot->size;
1769 htab->sgot->size += GOT_ENTRY_SIZE;
1770 }
1771 else
1772 h->got.offset = (bfd_vma) -1;
1773 }
1774 else if (h->got.refcount > 0)
1775 {
1776 asection *s;
1777 bfd_boolean dyn;
1778 int tls_type = elf_s390_hash_entry(h)->tls_type;
1779
1780 /* Make sure this symbol is output as a dynamic symbol.
1781 Undefined weak syms won't yet be marked as dynamic. */
1782 if (h->dynindx == -1
1783 && !h->forced_local)
1784 {
1785 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1786 return FALSE;
1787 }
1788
1789 s = htab->sgot;
1790 h->got.offset = s->size;
1791 s->size += GOT_ENTRY_SIZE;
1792 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */
1793 if (tls_type == GOT_TLS_GD)
1794 s->size += GOT_ENTRY_SIZE;
1795 dyn = htab->elf.dynamic_sections_created;
1796 /* R_390_TLS_IE64 needs one dynamic relocation,
1797 R_390_TLS_GD64 needs one if local symbol and two if global. */
1798 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1799 || tls_type >= GOT_TLS_IE)
1800 htab->srelgot->size += sizeof (Elf64_External_Rela);
1801 else if (tls_type == GOT_TLS_GD)
1802 htab->srelgot->size += 2 * sizeof (Elf64_External_Rela);
1803 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1804 || h->root.type != bfd_link_hash_undefweak)
1805 && (info->shared
1806 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1807 htab->srelgot->size += sizeof (Elf64_External_Rela);
1808 }
1809 else
1810 h->got.offset = (bfd_vma) -1;
1811
1812 eh = (struct elf_s390_link_hash_entry *) h;
1813 if (eh->dyn_relocs == NULL)
1814 return TRUE;
1815
1816 /* In the shared -Bsymbolic case, discard space allocated for
1817 dynamic pc-relative relocs against symbols which turn out to be
1818 defined in regular objects. For the normal shared case, discard
1819 space for pc-relative relocs that have become local due to symbol
1820 visibility changes. */
1821
1822 if (info->shared)
1823 {
1824 if (SYMBOL_CALLS_LOCAL (info, h))
1825 {
1826 struct elf_s390_dyn_relocs **pp;
1827
1828 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1829 {
1830 p->count -= p->pc_count;
1831 p->pc_count = 0;
1832 if (p->count == 0)
1833 *pp = p->next;
1834 else
1835 pp = &p->next;
1836 }
1837 }
1838
1839 /* Also discard relocs on undefined weak syms with non-default
1840 visibility. */
1841 if (eh->dyn_relocs != NULL
1842 && h->root.type == bfd_link_hash_undefweak)
1843 {
1844 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1845 eh->dyn_relocs = NULL;
1846
1847 /* Make sure undefined weak symbols are output as a dynamic
1848 symbol in PIEs. */
1849 else if (h->dynindx == -1
1850 && !h->forced_local)
1851 {
1852 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1853 return FALSE;
1854 }
1855 }
1856 }
1857 else if (ELIMINATE_COPY_RELOCS)
1858 {
1859 /* For the non-shared case, discard space for relocs against
1860 symbols which turn out to need copy relocs or are not
1861 dynamic. */
1862
1863 if (!h->non_got_ref
1864 && ((h->def_dynamic
1865 && !h->def_regular)
1866 || (htab->elf.dynamic_sections_created
1867 && (h->root.type == bfd_link_hash_undefweak
1868 || h->root.type == bfd_link_hash_undefined))))
1869 {
1870 /* Make sure this symbol is output as a dynamic symbol.
1871 Undefined weak syms won't yet be marked as dynamic. */
1872 if (h->dynindx == -1
1873 && !h->forced_local)
1874 {
1875 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1876 return FALSE;
1877 }
1878
1879 /* If that succeeded, we know we'll be keeping all the
1880 relocs. */
1881 if (h->dynindx != -1)
1882 goto keep;
1883 }
1884
1885 eh->dyn_relocs = NULL;
1886
1887 keep: ;
1888 }
1889
1890 /* Finally, allocate space. */
1891 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1892 {
1893 asection *sreloc = elf_section_data (p->sec)->sreloc;
1894 sreloc->size += p->count * sizeof (Elf64_External_Rela);
1895 }
1896
1897 return TRUE;
1898 }
1899
1900 /* Find any dynamic relocs that apply to read-only sections. */
1901
1902 static bfd_boolean
1903 readonly_dynrelocs (h, inf)
1904 struct elf_link_hash_entry *h;
1905 PTR inf;
1906 {
1907 struct elf_s390_link_hash_entry *eh;
1908 struct elf_s390_dyn_relocs *p;
1909
1910 if (h->root.type == bfd_link_hash_warning)
1911 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1912
1913 eh = (struct elf_s390_link_hash_entry *) h;
1914 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1915 {
1916 asection *s = p->sec->output_section;
1917
1918 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1919 {
1920 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1921
1922 info->flags |= DF_TEXTREL;
1923
1924 /* Not an error, just cut short the traversal. */
1925 return FALSE;
1926 }
1927 }
1928 return TRUE;
1929 }
1930
1931 /* Set the sizes of the dynamic sections. */
1932
1933 static bfd_boolean
1934 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1935 struct bfd_link_info *info)
1936 {
1937 struct elf_s390_link_hash_table *htab;
1938 bfd *dynobj;
1939 asection *s;
1940 bfd_boolean relocs;
1941 bfd *ibfd;
1942
1943 htab = elf_s390_hash_table (info);
1944 if (htab == NULL)
1945 return FALSE;
1946
1947 dynobj = htab->elf.dynobj;
1948 if (dynobj == NULL)
1949 abort ();
1950
1951 if (htab->elf.dynamic_sections_created)
1952 {
1953 /* Set the contents of the .interp section to the interpreter. */
1954 if (info->executable)
1955 {
1956 s = bfd_get_section_by_name (dynobj, ".interp");
1957 if (s == NULL)
1958 abort ();
1959 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1960 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1961 }
1962 }
1963
1964 /* Set up .got offsets for local syms, and space for local dynamic
1965 relocs. */
1966 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1967 {
1968 bfd_signed_vma *local_got;
1969 bfd_signed_vma *end_local_got;
1970 char *local_tls_type;
1971 bfd_size_type locsymcount;
1972 Elf_Internal_Shdr *symtab_hdr;
1973 asection *srela;
1974
1975 if (! is_s390_elf (ibfd))
1976 continue;
1977
1978 for (s = ibfd->sections; s != NULL; s = s->next)
1979 {
1980 struct elf_s390_dyn_relocs *p;
1981
1982 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
1983 {
1984 if (!bfd_is_abs_section (p->sec)
1985 && bfd_is_abs_section (p->sec->output_section))
1986 {
1987 /* Input section has been discarded, either because
1988 it is a copy of a linkonce section or due to
1989 linker script /DISCARD/, so we'll be discarding
1990 the relocs too. */
1991 }
1992 else if (p->count != 0)
1993 {
1994 srela = elf_section_data (p->sec)->sreloc;
1995 srela->size += p->count * sizeof (Elf64_External_Rela);
1996 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1997 info->flags |= DF_TEXTREL;
1998 }
1999 }
2000 }
2001
2002 local_got = elf_local_got_refcounts (ibfd);
2003 if (!local_got)
2004 continue;
2005
2006 symtab_hdr = &elf_symtab_hdr (ibfd);
2007 locsymcount = symtab_hdr->sh_info;
2008 end_local_got = local_got + locsymcount;
2009 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2010 s = htab->sgot;
2011 srela = htab->srelgot;
2012 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2013 {
2014 if (*local_got > 0)
2015 {
2016 *local_got = s->size;
2017 s->size += GOT_ENTRY_SIZE;
2018 if (*local_tls_type == GOT_TLS_GD)
2019 s->size += GOT_ENTRY_SIZE;
2020 if (info->shared)
2021 srela->size += sizeof (Elf64_External_Rela);
2022 }
2023 else
2024 *local_got = (bfd_vma) -1;
2025 }
2026 }
2027
2028 if (htab->tls_ldm_got.refcount > 0)
2029 {
2030 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64
2031 relocs. */
2032 htab->tls_ldm_got.offset = htab->sgot->size;
2033 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2034 htab->srelgot->size += sizeof (Elf64_External_Rela);
2035 }
2036 else
2037 htab->tls_ldm_got.offset = -1;
2038
2039 /* Allocate global sym .plt and .got entries, and space for global
2040 sym dynamic relocs. */
2041 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2042
2043 /* We now have determined the sizes of the various dynamic sections.
2044 Allocate memory for them. */
2045 relocs = FALSE;
2046 for (s = dynobj->sections; s != NULL; s = s->next)
2047 {
2048 if ((s->flags & SEC_LINKER_CREATED) == 0)
2049 continue;
2050
2051 if (s == htab->splt
2052 || s == htab->sgot
2053 || s == htab->sgotplt
2054 || s == htab->sdynbss)
2055 {
2056 /* Strip this section if we don't need it; see the
2057 comment below. */
2058 }
2059 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2060 {
2061 if (s->size != 0 && s != htab->srelplt)
2062 relocs = TRUE;
2063
2064 /* We use the reloc_count field as a counter if we need
2065 to copy relocs into the output file. */
2066 s->reloc_count = 0;
2067 }
2068 else
2069 {
2070 /* It's not one of our sections, so don't allocate space. */
2071 continue;
2072 }
2073
2074 if (s->size == 0)
2075 {
2076 /* If we don't need this section, strip it from the
2077 output file. This is to handle .rela.bss and
2078 .rela.plt. We must create it in
2079 create_dynamic_sections, because it must be created
2080 before the linker maps input sections to output
2081 sections. The linker does that before
2082 adjust_dynamic_symbol is called, and it is that
2083 function which decides whether anything needs to go
2084 into these sections. */
2085
2086 s->flags |= SEC_EXCLUDE;
2087 continue;
2088 }
2089
2090 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2091 continue;
2092
2093 /* Allocate memory for the section contents. We use bfd_zalloc
2094 here in case unused entries are not reclaimed before the
2095 section's contents are written out. This should not happen,
2096 but this way if it does, we get a R_390_NONE reloc instead
2097 of garbage. */
2098 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2099 if (s->contents == NULL)
2100 return FALSE;
2101 }
2102
2103 if (htab->elf.dynamic_sections_created)
2104 {
2105 /* Add some entries to the .dynamic section. We fill in the
2106 values later, in elf_s390_finish_dynamic_sections, but we
2107 must add the entries now so that we get the correct size for
2108 the .dynamic section. The DT_DEBUG entry is filled in by the
2109 dynamic linker and used by the debugger. */
2110 #define add_dynamic_entry(TAG, VAL) \
2111 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2112
2113 if (info->executable)
2114 {
2115 if (!add_dynamic_entry (DT_DEBUG, 0))
2116 return FALSE;
2117 }
2118
2119 if (htab->splt->size != 0)
2120 {
2121 if (!add_dynamic_entry (DT_PLTGOT, 0)
2122 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2123 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2124 || !add_dynamic_entry (DT_JMPREL, 0))
2125 return FALSE;
2126 }
2127
2128 if (relocs)
2129 {
2130 if (!add_dynamic_entry (DT_RELA, 0)
2131 || !add_dynamic_entry (DT_RELASZ, 0)
2132 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2133 return FALSE;
2134
2135 /* If any dynamic relocs apply to a read-only section,
2136 then we need a DT_TEXTREL entry. */
2137 if ((info->flags & DF_TEXTREL) == 0)
2138 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2139 (PTR) info);
2140
2141 if ((info->flags & DF_TEXTREL) != 0)
2142 {
2143 if (!add_dynamic_entry (DT_TEXTREL, 0))
2144 return FALSE;
2145 }
2146 }
2147 }
2148 #undef add_dynamic_entry
2149
2150 return TRUE;
2151 }
2152
2153 /* Return the base VMA address which should be subtracted from real addresses
2154 when resolving @dtpoff relocation.
2155 This is PT_TLS segment p_vaddr. */
2156
2157 static bfd_vma
2158 dtpoff_base (info)
2159 struct bfd_link_info *info;
2160 {
2161 /* If tls_sec is NULL, we should have signalled an error already. */
2162 if (elf_hash_table (info)->tls_sec == NULL)
2163 return 0;
2164 return elf_hash_table (info)->tls_sec->vma;
2165 }
2166
2167 /* Return the relocation value for @tpoff relocation
2168 if STT_TLS virtual address is ADDRESS. */
2169
2170 static bfd_vma
2171 tpoff (info, address)
2172 struct bfd_link_info *info;
2173 bfd_vma address;
2174 {
2175 struct elf_link_hash_table *htab = elf_hash_table (info);
2176
2177 /* If tls_sec is NULL, we should have signalled an error already. */
2178 if (htab->tls_sec == NULL)
2179 return 0;
2180 return htab->tls_size + htab->tls_sec->vma - address;
2181 }
2182
2183 /* Complain if TLS instruction relocation is against an invalid
2184 instruction. */
2185
2186 static void
2187 invalid_tls_insn (input_bfd, input_section, rel)
2188 bfd *input_bfd;
2189 asection *input_section;
2190 Elf_Internal_Rela *rel;
2191 {
2192 reloc_howto_type *howto;
2193
2194 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
2195 (*_bfd_error_handler)
2196 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2197 input_bfd,
2198 input_section,
2199 (long) rel->r_offset,
2200 howto->name);
2201 bfd_set_error (bfd_error_bad_value);
2202 }
2203
2204 /* Relocate a 390 ELF section. */
2205
2206 static bfd_boolean
2207 elf_s390_relocate_section (bfd *output_bfd,
2208 struct bfd_link_info *info,
2209 bfd *input_bfd,
2210 asection *input_section,
2211 bfd_byte *contents,
2212 Elf_Internal_Rela *relocs,
2213 Elf_Internal_Sym *local_syms,
2214 asection **local_sections)
2215 {
2216 struct elf_s390_link_hash_table *htab;
2217 Elf_Internal_Shdr *symtab_hdr;
2218 struct elf_link_hash_entry **sym_hashes;
2219 bfd_vma *local_got_offsets;
2220 Elf_Internal_Rela *rel;
2221 Elf_Internal_Rela *relend;
2222
2223 BFD_ASSERT (is_s390_elf (input_bfd));
2224
2225 htab = elf_s390_hash_table (info);
2226 if (htab == NULL)
2227 return FALSE;
2228
2229 symtab_hdr = &elf_symtab_hdr (input_bfd);
2230 sym_hashes = elf_sym_hashes (input_bfd);
2231 local_got_offsets = elf_local_got_offsets (input_bfd);
2232
2233 rel = relocs;
2234 relend = relocs + input_section->reloc_count;
2235 for (; rel < relend; rel++)
2236 {
2237 unsigned int r_type;
2238 reloc_howto_type *howto;
2239 unsigned long r_symndx;
2240 struct elf_link_hash_entry *h;
2241 Elf_Internal_Sym *sym;
2242 asection *sec;
2243 bfd_vma off;
2244 bfd_vma relocation;
2245 bfd_boolean unresolved_reloc;
2246 bfd_reloc_status_type r;
2247 int tls_type;
2248
2249 r_type = ELF64_R_TYPE (rel->r_info);
2250 if (r_type == (int) R_390_GNU_VTINHERIT
2251 || r_type == (int) R_390_GNU_VTENTRY)
2252 continue;
2253 if (r_type >= (int) R_390_max)
2254 {
2255 bfd_set_error (bfd_error_bad_value);
2256 return FALSE;
2257 }
2258
2259 howto = elf_howto_table + r_type;
2260 r_symndx = ELF64_R_SYM (rel->r_info);
2261
2262 h = NULL;
2263 sym = NULL;
2264 sec = NULL;
2265 unresolved_reloc = FALSE;
2266 if (r_symndx < symtab_hdr->sh_info)
2267 {
2268 sym = local_syms + r_symndx;
2269 sec = local_sections[r_symndx];
2270 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2271 }
2272 else
2273 {
2274 bfd_boolean warned ATTRIBUTE_UNUSED;
2275
2276 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2277 r_symndx, symtab_hdr, sym_hashes,
2278 h, sec, relocation,
2279 unresolved_reloc, warned);
2280 }
2281
2282 if (sec != NULL && elf_discarded_section (sec))
2283 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2284 rel, relend, howto, contents);
2285
2286 if (info->relocatable)
2287 continue;
2288
2289 switch (r_type)
2290 {
2291 case R_390_GOTPLT12:
2292 case R_390_GOTPLT16:
2293 case R_390_GOTPLT20:
2294 case R_390_GOTPLT32:
2295 case R_390_GOTPLT64:
2296 case R_390_GOTPLTENT:
2297 /* There are three cases for a GOTPLT relocation. 1) The
2298 relocation is against the jump slot entry of a plt that
2299 will get emitted to the output file. 2) The relocation
2300 is against the jump slot of a plt entry that has been
2301 removed. elf_s390_adjust_gotplt has created a GOT entry
2302 as replacement. 3) The relocation is against a local symbol.
2303 Cases 2) and 3) are the same as the GOT relocation code
2304 so we just have to test for case 1 and fall through for
2305 the other two. */
2306 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2307 {
2308 bfd_vma plt_index;
2309
2310 /* Calc. index no.
2311 Current offset - size first entry / entry size. */
2312 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2313 PLT_ENTRY_SIZE;
2314
2315 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2316 addr & GOT addr. */
2317 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2318 unresolved_reloc = FALSE;
2319
2320 if (r_type == R_390_GOTPLTENT)
2321 relocation += htab->sgot->output_section->vma;
2322 break;
2323 }
2324 /* Fall through. */
2325
2326 case R_390_GOT12:
2327 case R_390_GOT16:
2328 case R_390_GOT20:
2329 case R_390_GOT32:
2330 case R_390_GOT64:
2331 case R_390_GOTENT:
2332 /* Relocation is to the entry for this symbol in the global
2333 offset table. */
2334 if (htab->sgot == NULL)
2335 abort ();
2336
2337 if (h != NULL)
2338 {
2339 bfd_boolean dyn;
2340
2341 off = h->got.offset;
2342 dyn = htab->elf.dynamic_sections_created;
2343 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2344 || (info->shared
2345 && SYMBOL_REFERENCES_LOCAL (info, h))
2346 || (ELF_ST_VISIBILITY (h->other)
2347 && h->root.type == bfd_link_hash_undefweak))
2348 {
2349 /* This is actually a static link, or it is a
2350 -Bsymbolic link and the symbol is defined
2351 locally, or the symbol was forced to be local
2352 because of a version file. We must initialize
2353 this entry in the global offset table. Since the
2354 offset must always be a multiple of 2, we use the
2355 least significant bit to record whether we have
2356 initialized it already.
2357
2358 When doing a dynamic link, we create a .rel.got
2359 relocation entry to initialize the value. This
2360 is done in the finish_dynamic_symbol routine. */
2361 if ((off & 1) != 0)
2362 off &= ~1;
2363 else
2364 {
2365 bfd_put_64 (output_bfd, relocation,
2366 htab->sgot->contents + off);
2367 h->got.offset |= 1;
2368 }
2369 }
2370 else
2371 unresolved_reloc = FALSE;
2372 }
2373 else
2374 {
2375 if (local_got_offsets == NULL)
2376 abort ();
2377
2378 off = local_got_offsets[r_symndx];
2379
2380 /* The offset must always be a multiple of 8. We use
2381 the least significant bit to record whether we have
2382 already generated the necessary reloc. */
2383 if ((off & 1) != 0)
2384 off &= ~1;
2385 else
2386 {
2387 bfd_put_64 (output_bfd, relocation,
2388 htab->sgot->contents + off);
2389
2390 if (info->shared)
2391 {
2392 asection *s;
2393 Elf_Internal_Rela outrel;
2394 bfd_byte *loc;
2395
2396 s = htab->srelgot;
2397 if (s == NULL)
2398 abort ();
2399
2400 outrel.r_offset = (htab->sgot->output_section->vma
2401 + htab->sgot->output_offset
2402 + off);
2403 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2404 outrel.r_addend = relocation;
2405 loc = s->contents;
2406 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2407 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2408 }
2409
2410 local_got_offsets[r_symndx] |= 1;
2411 }
2412 }
2413
2414 if (off >= (bfd_vma) -2)
2415 abort ();
2416
2417 relocation = htab->sgot->output_offset + off;
2418
2419 /* For @GOTENT the relocation is against the offset between
2420 the instruction and the symbols entry in the GOT and not
2421 between the start of the GOT and the symbols entry. We
2422 add the vma of the GOT to get the correct value. */
2423 if ( r_type == R_390_GOTENT
2424 || r_type == R_390_GOTPLTENT)
2425 relocation += htab->sgot->output_section->vma;
2426
2427 break;
2428
2429 case R_390_GOTOFF16:
2430 case R_390_GOTOFF32:
2431 case R_390_GOTOFF64:
2432 /* Relocation is relative to the start of the global offset
2433 table. */
2434
2435 /* Note that sgot->output_offset is not involved in this
2436 calculation. We always want the start of .got. If we
2437 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2438 permitted by the ABI, we might have to change this
2439 calculation. */
2440 relocation -= htab->sgot->output_section->vma;
2441 break;
2442
2443 case R_390_GOTPC:
2444 case R_390_GOTPCDBL:
2445 /* Use global offset table as symbol value. */
2446 relocation = htab->sgot->output_section->vma;
2447 unresolved_reloc = FALSE;
2448 break;
2449
2450 case R_390_PLT16DBL:
2451 case R_390_PLT32:
2452 case R_390_PLT32DBL:
2453 case R_390_PLT64:
2454 /* Relocation is to the entry for this symbol in the
2455 procedure linkage table. */
2456
2457 /* Resolve a PLT32 reloc against a local symbol directly,
2458 without using the procedure linkage table. */
2459 if (h == NULL)
2460 break;
2461
2462 if (h->plt.offset == (bfd_vma) -1
2463 || htab->splt == NULL)
2464 {
2465 /* We didn't make a PLT entry for this symbol. This
2466 happens when statically linking PIC code, or when
2467 using -Bsymbolic. */
2468 break;
2469 }
2470
2471 relocation = (htab->splt->output_section->vma
2472 + htab->splt->output_offset
2473 + h->plt.offset);
2474 unresolved_reloc = FALSE;
2475 break;
2476
2477 case R_390_PLTOFF16:
2478 case R_390_PLTOFF32:
2479 case R_390_PLTOFF64:
2480 /* Relocation is to the entry for this symbol in the
2481 procedure linkage table relative to the start of the GOT. */
2482
2483 /* For local symbols or if we didn't make a PLT entry for
2484 this symbol resolve the symbol directly. */
2485 if ( h == NULL
2486 || h->plt.offset == (bfd_vma) -1
2487 || htab->splt == NULL)
2488 {
2489 relocation -= htab->sgot->output_section->vma;
2490 break;
2491 }
2492
2493 relocation = (htab->splt->output_section->vma
2494 + htab->splt->output_offset
2495 + h->plt.offset
2496 - htab->sgot->output_section->vma);
2497 unresolved_reloc = FALSE;
2498 break;
2499
2500 case R_390_8:
2501 case R_390_16:
2502 case R_390_32:
2503 case R_390_64:
2504 case R_390_PC16:
2505 case R_390_PC16DBL:
2506 case R_390_PC32:
2507 case R_390_PC32DBL:
2508 case R_390_PC64:
2509 if ((input_section->flags & SEC_ALLOC) == 0)
2510 break;
2511
2512 if ((info->shared
2513 && (h == NULL
2514 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2515 || h->root.type != bfd_link_hash_undefweak)
2516 && ((r_type != R_390_PC16
2517 && r_type != R_390_PC16DBL
2518 && r_type != R_390_PC32
2519 && r_type != R_390_PC32DBL
2520 && r_type != R_390_PC64)
2521 || !SYMBOL_CALLS_LOCAL (info, h)))
2522 || (ELIMINATE_COPY_RELOCS
2523 && !info->shared
2524 && h != NULL
2525 && h->dynindx != -1
2526 && !h->non_got_ref
2527 && ((h->def_dynamic
2528 && !h->def_regular)
2529 || h->root.type == bfd_link_hash_undefweak
2530 || h->root.type == bfd_link_hash_undefined)))
2531 {
2532 Elf_Internal_Rela outrel;
2533 bfd_boolean skip, relocate;
2534 asection *sreloc;
2535 bfd_byte *loc;
2536
2537 /* When generating a shared object, these relocations
2538 are copied into the output file to be resolved at run
2539 time. */
2540 skip = FALSE;
2541 relocate = FALSE;
2542
2543 outrel.r_offset =
2544 _bfd_elf_section_offset (output_bfd, info, input_section,
2545 rel->r_offset);
2546 if (outrel.r_offset == (bfd_vma) -1)
2547 skip = TRUE;
2548 else if (outrel.r_offset == (bfd_vma) -2)
2549 skip = TRUE, relocate = TRUE;
2550
2551 outrel.r_offset += (input_section->output_section->vma
2552 + input_section->output_offset);
2553
2554 if (skip)
2555 memset (&outrel, 0, sizeof outrel);
2556 else if (h != NULL
2557 && h->dynindx != -1
2558 && (r_type == R_390_PC16
2559 || r_type == R_390_PC16DBL
2560 || r_type == R_390_PC32
2561 || r_type == R_390_PC32DBL
2562 || r_type == R_390_PC64
2563 || !info->shared
2564 || !SYMBOLIC_BIND (info, h)
2565 || !h->def_regular))
2566 {
2567 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2568 outrel.r_addend = rel->r_addend;
2569 }
2570 else
2571 {
2572 /* This symbol is local, or marked to become local. */
2573 outrel.r_addend = relocation + rel->r_addend;
2574 if (r_type == R_390_64)
2575 {
2576 relocate = TRUE;
2577 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2578 }
2579 else
2580 {
2581 long sindx;
2582
2583 if (bfd_is_abs_section (sec))
2584 sindx = 0;
2585 else if (sec == NULL || sec->owner == NULL)
2586 {
2587 bfd_set_error(bfd_error_bad_value);
2588 return FALSE;
2589 }
2590 else
2591 {
2592 asection *osec;
2593
2594 osec = sec->output_section;
2595 sindx = elf_section_data (osec)->dynindx;
2596
2597 if (sindx == 0)
2598 {
2599 osec = htab->elf.text_index_section;
2600 sindx = elf_section_data (osec)->dynindx;
2601 }
2602 BFD_ASSERT (sindx != 0);
2603
2604 /* We are turning this relocation into one
2605 against a section symbol, so subtract out
2606 the output section's address but not the
2607 offset of the input section in the output
2608 section. */
2609 outrel.r_addend -= osec->vma;
2610 }
2611 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2612 }
2613 }
2614
2615 sreloc = elf_section_data (input_section)->sreloc;
2616 if (sreloc == NULL)
2617 abort ();
2618
2619 loc = sreloc->contents;
2620 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2621 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2622
2623 /* If this reloc is against an external symbol, we do
2624 not want to fiddle with the addend. Otherwise, we
2625 need to include the symbol value so that it becomes
2626 an addend for the dynamic reloc. */
2627 if (! relocate)
2628 continue;
2629 }
2630
2631 break;
2632
2633 /* Relocations for tls literal pool entries. */
2634 case R_390_TLS_IE64:
2635 if (info->shared)
2636 {
2637 Elf_Internal_Rela outrel;
2638 asection *sreloc;
2639 bfd_byte *loc;
2640
2641 outrel.r_offset = rel->r_offset
2642 + input_section->output_section->vma
2643 + input_section->output_offset;
2644 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2645 sreloc = elf_section_data (input_section)->sreloc;
2646 if (sreloc == NULL)
2647 abort ();
2648 loc = sreloc->contents;
2649 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2650 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2651 }
2652 /* Fall through. */
2653
2654 case R_390_TLS_GD64:
2655 case R_390_TLS_GOTIE64:
2656 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2657 tls_type = GOT_UNKNOWN;
2658 if (h == NULL && local_got_offsets)
2659 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2660 else if (h != NULL)
2661 {
2662 tls_type = elf_s390_hash_entry(h)->tls_type;
2663 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2664 r_type = R_390_TLS_LE64;
2665 }
2666 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2667 r_type = R_390_TLS_IE64;
2668
2669 if (r_type == R_390_TLS_LE64)
2670 {
2671 /* This relocation gets optimized away by the local exec
2672 access optimization. */
2673 BFD_ASSERT (! unresolved_reloc);
2674 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2675 contents + rel->r_offset);
2676 continue;
2677 }
2678
2679 if (htab->sgot == NULL)
2680 abort ();
2681
2682 if (h != NULL)
2683 off = h->got.offset;
2684 else
2685 {
2686 if (local_got_offsets == NULL)
2687 abort ();
2688
2689 off = local_got_offsets[r_symndx];
2690 }
2691
2692 emit_tls_relocs:
2693
2694 if ((off & 1) != 0)
2695 off &= ~1;
2696 else
2697 {
2698 Elf_Internal_Rela outrel;
2699 bfd_byte *loc;
2700 int dr_type, indx;
2701
2702 if (htab->srelgot == NULL)
2703 abort ();
2704
2705 outrel.r_offset = (htab->sgot->output_section->vma
2706 + htab->sgot->output_offset + off);
2707
2708 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2709 if (r_type == R_390_TLS_GD64)
2710 dr_type = R_390_TLS_DTPMOD;
2711 else
2712 dr_type = R_390_TLS_TPOFF;
2713 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2714 outrel.r_addend = relocation - dtpoff_base (info);
2715 else
2716 outrel.r_addend = 0;
2717 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2718 loc = htab->srelgot->contents;
2719 loc += htab->srelgot->reloc_count++
2720 * sizeof (Elf64_External_Rela);
2721 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2722
2723 if (r_type == R_390_TLS_GD64)
2724 {
2725 if (indx == 0)
2726 {
2727 BFD_ASSERT (! unresolved_reloc);
2728 bfd_put_64 (output_bfd,
2729 relocation - dtpoff_base (info),
2730 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2731 }
2732 else
2733 {
2734 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
2735 outrel.r_offset += GOT_ENTRY_SIZE;
2736 outrel.r_addend = 0;
2737 htab->srelgot->reloc_count++;
2738 loc += sizeof (Elf64_External_Rela);
2739 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2740 }
2741 }
2742
2743 if (h != NULL)
2744 h->got.offset |= 1;
2745 else
2746 local_got_offsets[r_symndx] |= 1;
2747 }
2748
2749 if (off >= (bfd_vma) -2)
2750 abort ();
2751 if (r_type == ELF64_R_TYPE (rel->r_info))
2752 {
2753 relocation = htab->sgot->output_offset + off;
2754 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
2755 relocation += htab->sgot->output_section->vma;
2756 unresolved_reloc = FALSE;
2757 }
2758 else
2759 {
2760 bfd_put_64 (output_bfd, htab->sgot->output_offset + off,
2761 contents + rel->r_offset);
2762 continue;
2763 }
2764 break;
2765
2766 case R_390_TLS_GOTIE12:
2767 case R_390_TLS_GOTIE20:
2768 case R_390_TLS_IEENT:
2769 if (h == NULL)
2770 {
2771 if (local_got_offsets == NULL)
2772 abort();
2773 off = local_got_offsets[r_symndx];
2774 if (info->shared)
2775 goto emit_tls_relocs;
2776 }
2777 else
2778 {
2779 off = h->got.offset;
2780 tls_type = elf_s390_hash_entry(h)->tls_type;
2781 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2782 goto emit_tls_relocs;
2783 }
2784
2785 if (htab->sgot == NULL)
2786 abort ();
2787
2788 BFD_ASSERT (! unresolved_reloc);
2789 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2790 htab->sgot->contents + off);
2791 relocation = htab->sgot->output_offset + off;
2792 if (r_type == R_390_TLS_IEENT)
2793 relocation += htab->sgot->output_section->vma;
2794 unresolved_reloc = FALSE;
2795 break;
2796
2797 case R_390_TLS_LDM64:
2798 if (! info->shared)
2799 /* The literal pool entry this relocation refers to gets ignored
2800 by the optimized code of the local exec model. Do nothing
2801 and the value will turn out zero. */
2802 continue;
2803
2804 if (htab->sgot == NULL)
2805 abort ();
2806
2807 off = htab->tls_ldm_got.offset;
2808 if (off & 1)
2809 off &= ~1;
2810 else
2811 {
2812 Elf_Internal_Rela outrel;
2813 bfd_byte *loc;
2814
2815 if (htab->srelgot == NULL)
2816 abort ();
2817
2818 outrel.r_offset = (htab->sgot->output_section->vma
2819 + htab->sgot->output_offset + off);
2820
2821 bfd_put_64 (output_bfd, 0,
2822 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2823 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
2824 outrel.r_addend = 0;
2825 loc = htab->srelgot->contents;
2826 loc += htab->srelgot->reloc_count++
2827 * sizeof (Elf64_External_Rela);
2828 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2829 htab->tls_ldm_got.offset |= 1;
2830 }
2831 relocation = htab->sgot->output_offset + off;
2832 unresolved_reloc = FALSE;
2833 break;
2834
2835 case R_390_TLS_LE64:
2836 if (info->shared)
2837 {
2838 /* Linking a shared library with non-fpic code requires
2839 a R_390_TLS_TPOFF relocation. */
2840 Elf_Internal_Rela outrel;
2841 asection *sreloc;
2842 bfd_byte *loc;
2843 int indx;
2844
2845 outrel.r_offset = rel->r_offset
2846 + input_section->output_section->vma
2847 + input_section->output_offset;
2848 if (h != NULL && h->dynindx != -1)
2849 indx = h->dynindx;
2850 else
2851 indx = 0;
2852 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
2853 if (indx == 0)
2854 outrel.r_addend = relocation - dtpoff_base (info);
2855 else
2856 outrel.r_addend = 0;
2857 sreloc = elf_section_data (input_section)->sreloc;
2858 if (sreloc == NULL)
2859 abort ();
2860 loc = sreloc->contents;
2861 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2862 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2863 }
2864 else
2865 {
2866 BFD_ASSERT (! unresolved_reloc);
2867 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2868 contents + rel->r_offset);
2869 }
2870 continue;
2871
2872 case R_390_TLS_LDO64:
2873 if (info->shared)
2874 relocation -= dtpoff_base (info);
2875 else
2876 /* When converting LDO to LE, we must negate. */
2877 relocation = -tpoff (info, relocation);
2878 break;
2879
2880 /* Relocations for tls instructions. */
2881 case R_390_TLS_LOAD:
2882 case R_390_TLS_GDCALL:
2883 case R_390_TLS_LDCALL:
2884 tls_type = GOT_UNKNOWN;
2885 if (h == NULL && local_got_offsets)
2886 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2887 else if (h != NULL)
2888 tls_type = elf_s390_hash_entry(h)->tls_type;
2889
2890 if (tls_type == GOT_TLS_GD)
2891 continue;
2892
2893 if (r_type == R_390_TLS_LOAD)
2894 {
2895 if (!info->shared && (h == NULL || h->dynindx == -1))
2896 {
2897 /* IE->LE transition. Four valid cases:
2898 lg %rx,(0,%ry) -> sllg %rx,%ry,0
2899 lg %rx,(%ry,0) -> sllg %rx,%ry,0
2900 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
2901 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
2902 unsigned int insn0, insn1, ry;
2903
2904 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2905 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2906 if (insn1 != 0x0004)
2907 invalid_tls_insn (input_bfd, input_section, rel);
2908 ry = 0;
2909 if ((insn0 & 0xff00f000) == 0xe3000000)
2910 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
2911 ry = (insn0 & 0x000f0000);
2912 else if ((insn0 & 0xff0f0000) == 0xe3000000)
2913 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
2914 ry = (insn0 & 0x0000f000) << 4;
2915 else if ((insn0 & 0xff00f000) == 0xe300c000)
2916 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
2917 ry = (insn0 & 0x000f0000);
2918 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
2919 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
2920 ry = (insn0 & 0x0000f000) << 4;
2921 else
2922 invalid_tls_insn (input_bfd, input_section, rel);
2923 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
2924 insn1 = 0x000d;
2925 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2926 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2927 }
2928 }
2929 else if (r_type == R_390_TLS_GDCALL)
2930 {
2931 unsigned int insn0, insn1;
2932
2933 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2934 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2935 if ((insn0 & 0xffff0000) != 0xc0e50000)
2936 invalid_tls_insn (input_bfd, input_section, rel);
2937 if (!info->shared && (h == NULL || h->dynindx == -1))
2938 {
2939 /* GD->LE transition.
2940 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2941 insn0 = 0xc0040000;
2942 insn1 = 0x0000;
2943 }
2944 else
2945 {
2946 /* GD->IE transition.
2947 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
2948 insn0 = 0xe322c000;
2949 insn1 = 0x0004;
2950 }
2951 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2952 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2953 }
2954 else if (r_type == R_390_TLS_LDCALL)
2955 {
2956 if (!info->shared)
2957 {
2958 unsigned int insn0, insn1;
2959
2960 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2961 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2962 if ((insn0 & 0xffff0000) != 0xc0e50000)
2963 invalid_tls_insn (input_bfd, input_section, rel);
2964 /* LD->LE transition.
2965 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2966 insn0 = 0xc0040000;
2967 insn1 = 0x0000;
2968 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2969 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2970 }
2971 }
2972 continue;
2973
2974 default:
2975 break;
2976 }
2977
2978 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2979 because such sections are not SEC_ALLOC and thus ld.so will
2980 not process them. */
2981 if (unresolved_reloc
2982 && !((input_section->flags & SEC_DEBUGGING) != 0
2983 && h->def_dynamic))
2984 (*_bfd_error_handler)
2985 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
2986 input_bfd,
2987 input_section,
2988 (long) rel->r_offset,
2989 howto->name,
2990 h->root.root.string);
2991
2992 if (r_type == R_390_20
2993 || r_type == R_390_GOT20
2994 || r_type == R_390_GOTPLT20
2995 || r_type == R_390_TLS_GOTIE20)
2996 {
2997 relocation += rel->r_addend;
2998 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
2999 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3000 contents, rel->r_offset,
3001 relocation, 0);
3002 }
3003 else
3004 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3005 contents, rel->r_offset,
3006 relocation, rel->r_addend);
3007
3008 if (r != bfd_reloc_ok)
3009 {
3010 const char *name;
3011
3012 if (h != NULL)
3013 name = h->root.root.string;
3014 else
3015 {
3016 name = bfd_elf_string_from_elf_section (input_bfd,
3017 symtab_hdr->sh_link,
3018 sym->st_name);
3019 if (name == NULL)
3020 return FALSE;
3021 if (*name == '\0')
3022 name = bfd_section_name (input_bfd, sec);
3023 }
3024
3025 if (r == bfd_reloc_overflow)
3026 {
3027
3028 if (! ((*info->callbacks->reloc_overflow)
3029 (info, (h ? &h->root : NULL), name, howto->name,
3030 (bfd_vma) 0, input_bfd, input_section,
3031 rel->r_offset)))
3032 return FALSE;
3033 }
3034 else
3035 {
3036 (*_bfd_error_handler)
3037 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3038 input_bfd, input_section,
3039 (long) rel->r_offset, name, (int) r);
3040 return FALSE;
3041 }
3042 }
3043 }
3044
3045 return TRUE;
3046 }
3047
3048 /* Finish up dynamic symbol handling. We set the contents of various
3049 dynamic sections here. */
3050
3051 static bfd_boolean
3052 elf_s390_finish_dynamic_symbol (bfd *output_bfd,
3053 struct bfd_link_info *info,
3054 struct elf_link_hash_entry *h,
3055 Elf_Internal_Sym *sym)
3056 {
3057 struct elf_s390_link_hash_table *htab;
3058
3059 htab = elf_s390_hash_table (info);
3060 if (htab == NULL)
3061 return FALSE;
3062
3063 if (h->plt.offset != (bfd_vma) -1)
3064 {
3065 bfd_vma plt_index;
3066 bfd_vma got_offset;
3067 Elf_Internal_Rela rela;
3068 bfd_byte *loc;
3069
3070 /* This symbol has an entry in the procedure linkage table. Set
3071 it up. */
3072
3073 if (h->dynindx == -1
3074 || htab->splt == NULL
3075 || htab->sgotplt == NULL
3076 || htab->srelplt == NULL)
3077 abort ();
3078
3079 /* Calc. index no.
3080 Current offset - size first entry / entry size. */
3081 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3082
3083 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
3084 addr & GOT addr. */
3085 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3086
3087 /* Fill in the blueprint of a PLT. */
3088 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3089 htab->splt->contents + h->plt.offset);
3090 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3091 htab->splt->contents + h->plt.offset + 4);
3092 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3093 htab->splt->contents + h->plt.offset + 8);
3094 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3095 htab->splt->contents + h->plt.offset + 12);
3096 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3097 htab->splt->contents + h->plt.offset + 16);
3098 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5,
3099 htab->splt->contents + h->plt.offset + 20);
3100 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6,
3101 htab->splt->contents + h->plt.offset + 24);
3102 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7,
3103 htab->splt->contents + h->plt.offset + 28);
3104 /* Fixup the relative address to the GOT entry */
3105 bfd_put_32 (output_bfd,
3106 (htab->sgotplt->output_section->vma +
3107 htab->sgotplt->output_offset + got_offset
3108 - (htab->splt->output_section->vma + h->plt.offset))/2,
3109 htab->splt->contents + h->plt.offset + 2);
3110 /* Fixup the relative branch to PLT 0 */
3111 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3112 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3113 htab->splt->contents + h->plt.offset + 24);
3114 /* Fixup offset into symbol table */
3115 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3116 htab->splt->contents + h->plt.offset + 28);
3117
3118 /* Fill in the entry in the global offset table.
3119 Points to instruction after GOT offset. */
3120 bfd_put_64 (output_bfd,
3121 (htab->splt->output_section->vma
3122 + htab->splt->output_offset
3123 + h->plt.offset
3124 + 14),
3125 htab->sgotplt->contents + got_offset);
3126
3127 /* Fill in the entry in the .rela.plt section. */
3128 rela.r_offset = (htab->sgotplt->output_section->vma
3129 + htab->sgotplt->output_offset
3130 + got_offset);
3131 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3132 rela.r_addend = 0;
3133 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela);
3134 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3135
3136 if (!h->def_regular)
3137 {
3138 /* Mark the symbol as undefined, rather than as defined in
3139 the .plt section. Leave the value alone. This is a clue
3140 for the dynamic linker, to make function pointer
3141 comparisons work between an application and shared
3142 library. */
3143 sym->st_shndx = SHN_UNDEF;
3144 }
3145 }
3146
3147 if (h->got.offset != (bfd_vma) -1
3148 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3149 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3150 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3151 {
3152 Elf_Internal_Rela rela;
3153 bfd_byte *loc;
3154
3155 /* This symbol has an entry in the global offset table. Set it
3156 up. */
3157 if (htab->sgot == NULL || htab->srelgot == NULL)
3158 abort ();
3159
3160 rela.r_offset = (htab->sgot->output_section->vma
3161 + htab->sgot->output_offset
3162 + (h->got.offset &~ (bfd_vma) 1));
3163
3164 /* If this is a static link, or it is a -Bsymbolic link and the
3165 symbol is defined locally or was forced to be local because
3166 of a version file, we just want to emit a RELATIVE reloc.
3167 The entry in the global offset table will already have been
3168 initialized in the relocate_section function. */
3169 if (info->shared
3170 && SYMBOL_REFERENCES_LOCAL (info, h))
3171 {
3172 if (!h->def_regular)
3173 return FALSE;
3174 BFD_ASSERT((h->got.offset & 1) != 0);
3175 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3176 rela.r_addend = (h->root.u.def.value
3177 + h->root.u.def.section->output_section->vma
3178 + h->root.u.def.section->output_offset);
3179 }
3180 else
3181 {
3182 BFD_ASSERT((h->got.offset & 1) == 0);
3183 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3184 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3185 rela.r_addend = 0;
3186 }
3187
3188 loc = htab->srelgot->contents;
3189 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3190 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3191 }
3192
3193 if (h->needs_copy)
3194 {
3195 Elf_Internal_Rela rela;
3196 bfd_byte *loc;
3197
3198 /* This symbols needs a copy reloc. Set it up. */
3199
3200 if (h->dynindx == -1
3201 || (h->root.type != bfd_link_hash_defined
3202 && h->root.type != bfd_link_hash_defweak)
3203 || htab->srelbss == NULL)
3204 abort ();
3205
3206 rela.r_offset = (h->root.u.def.value
3207 + h->root.u.def.section->output_section->vma
3208 + h->root.u.def.section->output_offset);
3209 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3210 rela.r_addend = 0;
3211 loc = htab->srelbss->contents;
3212 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3213 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3214 }
3215
3216 /* Mark some specially defined symbols as absolute. */
3217 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3218 || h == htab->elf.hgot
3219 || h == htab->elf.hplt)
3220 sym->st_shndx = SHN_ABS;
3221
3222 return TRUE;
3223 }
3224
3225 /* Used to decide how to sort relocs in an optimal manner for the
3226 dynamic linker, before writing them out. */
3227
3228 static enum elf_reloc_type_class
3229 elf_s390_reloc_type_class (rela)
3230 const Elf_Internal_Rela *rela;
3231 {
3232 switch ((int) ELF64_R_TYPE (rela->r_info))
3233 {
3234 case R_390_RELATIVE:
3235 return reloc_class_relative;
3236 case R_390_JMP_SLOT:
3237 return reloc_class_plt;
3238 case R_390_COPY:
3239 return reloc_class_copy;
3240 default:
3241 return reloc_class_normal;
3242 }
3243 }
3244
3245 /* Finish up the dynamic sections. */
3246
3247 static bfd_boolean
3248 elf_s390_finish_dynamic_sections (bfd *output_bfd,
3249 struct bfd_link_info *info)
3250 {
3251 struct elf_s390_link_hash_table *htab;
3252 bfd *dynobj;
3253 asection *sdyn;
3254
3255 htab = elf_s390_hash_table (info);
3256 if (htab == NULL)
3257 return FALSE;
3258
3259 dynobj = htab->elf.dynobj;
3260 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3261
3262 if (htab->elf.dynamic_sections_created)
3263 {
3264 Elf64_External_Dyn *dyncon, *dynconend;
3265
3266 if (sdyn == NULL || htab->sgot == NULL)
3267 abort ();
3268
3269 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3270 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3271 for (; dyncon < dynconend; dyncon++)
3272 {
3273 Elf_Internal_Dyn dyn;
3274 asection *s;
3275
3276 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3277
3278 switch (dyn.d_tag)
3279 {
3280 default:
3281 continue;
3282
3283 case DT_PLTGOT:
3284 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3285 break;
3286
3287 case DT_JMPREL:
3288 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3289 break;
3290
3291 case DT_PLTRELSZ:
3292 s = htab->srelplt->output_section;
3293 dyn.d_un.d_val = s->size;
3294 break;
3295
3296 case DT_RELASZ:
3297 /* The procedure linkage table relocs (DT_JMPREL) should
3298 not be included in the overall relocs (DT_RELA).
3299 Therefore, we override the DT_RELASZ entry here to
3300 make it not include the JMPREL relocs. Since the
3301 linker script arranges for .rela.plt to follow all
3302 other relocation sections, we don't have to worry
3303 about changing the DT_RELA entry. */
3304 s = htab->srelplt->output_section;
3305 dyn.d_un.d_val -= s->size;
3306 break;
3307 }
3308
3309 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3310 }
3311
3312 /* Fill in the special first entry in the procedure linkage table. */
3313 if (htab->splt && htab->splt->size > 0)
3314 {
3315 /* fill in blueprint for plt 0 entry */
3316 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0,
3317 htab->splt->contents );
3318 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3319 htab->splt->contents +4 );
3320 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3321 htab->splt->contents +12 );
3322 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3323 htab->splt->contents +16 );
3324 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3325 htab->splt->contents +20 );
3326 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6,
3327 htab->splt->contents + 24);
3328 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7,
3329 htab->splt->contents + 28 );
3330 /* Fixup relative address to start of GOT */
3331 bfd_put_32 (output_bfd,
3332 (htab->sgotplt->output_section->vma +
3333 htab->sgotplt->output_offset
3334 - htab->splt->output_section->vma - 6)/2,
3335 htab->splt->contents + 8);
3336 }
3337 elf_section_data (htab->splt->output_section)
3338 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE;
3339 }
3340
3341 if (htab->sgotplt)
3342 {
3343 /* Fill in the first three entries in the global offset table. */
3344 if (htab->sgotplt->size > 0)
3345 {
3346 bfd_put_64 (output_bfd,
3347 (sdyn == NULL ? (bfd_vma) 0
3348 : sdyn->output_section->vma + sdyn->output_offset),
3349 htab->sgotplt->contents);
3350 /* One entry for shared object struct ptr. */
3351 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3352 /* One entry for _dl_runtime_resolve. */
3353 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12);
3354 }
3355
3356 elf_section_data (htab->sgot->output_section)
3357 ->this_hdr.sh_entsize = 8;
3358 }
3359 return TRUE;
3360 }
3361
3362 /* Return address for Ith PLT stub in section PLT, for relocation REL
3363 or (bfd_vma) -1 if it should not be included. */
3364
3365 static bfd_vma
3366 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3367 const arelent *rel ATTRIBUTE_UNUSED)
3368 {
3369 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3370 }
3371
3372
3373 /* Why was the hash table entry size definition changed from
3374 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3375 this is the only reason for the s390_elf64_size_info structure. */
3376
3377 const struct elf_size_info s390_elf64_size_info =
3378 {
3379 sizeof (Elf64_External_Ehdr),
3380 sizeof (Elf64_External_Phdr),
3381 sizeof (Elf64_External_Shdr),
3382 sizeof (Elf64_External_Rel),
3383 sizeof (Elf64_External_Rela),
3384 sizeof (Elf64_External_Sym),
3385 sizeof (Elf64_External_Dyn),
3386 sizeof (Elf_External_Note),
3387 8, /* hash-table entry size. */
3388 1, /* internal relocations per external relocations. */
3389 64, /* arch_size. */
3390 3, /* log_file_align. */
3391 ELFCLASS64, EV_CURRENT,
3392 bfd_elf64_write_out_phdrs,
3393 bfd_elf64_write_shdrs_and_ehdr,
3394 bfd_elf64_checksum_contents,
3395 bfd_elf64_write_relocs,
3396 bfd_elf64_swap_symbol_in,
3397 bfd_elf64_swap_symbol_out,
3398 bfd_elf64_slurp_reloc_table,
3399 bfd_elf64_slurp_symbol_table,
3400 bfd_elf64_swap_dyn_in,
3401 bfd_elf64_swap_dyn_out,
3402 bfd_elf64_swap_reloc_in,
3403 bfd_elf64_swap_reloc_out,
3404 bfd_elf64_swap_reloca_in,
3405 bfd_elf64_swap_reloca_out
3406 };
3407
3408 #define TARGET_BIG_SYM bfd_elf64_s390_vec
3409 #define TARGET_BIG_NAME "elf64-s390"
3410 #define ELF_ARCH bfd_arch_s390
3411 #define ELF_TARGET_ID S390_ELF_DATA
3412 #define ELF_MACHINE_CODE EM_S390
3413 #define ELF_MACHINE_ALT1 EM_S390_OLD
3414 #define ELF_MAXPAGESIZE 0x1000
3415
3416 #define elf_backend_size_info s390_elf64_size_info
3417
3418 #define elf_backend_can_gc_sections 1
3419 #define elf_backend_can_refcount 1
3420 #define elf_backend_want_got_plt 1
3421 #define elf_backend_plt_readonly 1
3422 #define elf_backend_want_plt_sym 0
3423 #define elf_backend_got_header_size 24
3424 #define elf_backend_rela_normal 1
3425
3426 #define elf_info_to_howto elf_s390_info_to_howto
3427
3428 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3429 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3430 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3431 #define bfd_elf64_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
3432
3433 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3434 #define elf_backend_check_relocs elf_s390_check_relocs
3435 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3436 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3437 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3438 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3439 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3440 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3441 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3442 #define elf_backend_relocate_section elf_s390_relocate_section
3443 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3444 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3445 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3446 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3447
3448 #define bfd_elf64_mkobject elf_s390_mkobject
3449 #define elf_backend_object_p elf_s390_object_p
3450
3451 #include "elf64-target.h"
git-cvsimport of binutils cvsroot