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2009-07-10 H.J. Lu <hongjiu.lu@intel.com>
[binutils.git] / bfd / elf64-s390.c
blobeef92d031025ea3beae87c30a83591d8fcfdc68c
1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
3 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_TDATA)
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_TDATA);
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 ((struct elf_s390_link_hash_table *) ((p)->hash))
696
697 /* Create an entry in an s390 ELF linker hash table. */
698
699 static struct bfd_hash_entry *
700 link_hash_newfunc (entry, table, string)
701 struct bfd_hash_entry *entry;
702 struct bfd_hash_table *table;
703 const char *string;
704 {
705 /* Allocate the structure if it has not already been allocated by a
706 subclass. */
707 if (entry == NULL)
708 {
709 entry = bfd_hash_allocate (table,
710 sizeof (struct elf_s390_link_hash_entry));
711 if (entry == NULL)
712 return entry;
713 }
714
715 /* Call the allocation method of the superclass. */
716 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
717 if (entry != NULL)
718 {
719 struct elf_s390_link_hash_entry *eh;
720
721 eh = (struct elf_s390_link_hash_entry *) entry;
722 eh->dyn_relocs = NULL;
723 eh->gotplt_refcount = 0;
724 eh->tls_type = GOT_UNKNOWN;
725 }
726
727 return entry;
728 }
729
730 /* Create an s390 ELF linker hash table. */
731
732 static struct bfd_link_hash_table *
733 elf_s390_link_hash_table_create (abfd)
734 bfd *abfd;
735 {
736 struct elf_s390_link_hash_table *ret;
737 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
738
739 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
740 if (ret == NULL)
741 return NULL;
742
743 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
744 sizeof (struct elf_s390_link_hash_entry)))
745 {
746 free (ret);
747 return NULL;
748 }
749
750 ret->sgot = NULL;
751 ret->sgotplt = NULL;
752 ret->srelgot = NULL;
753 ret->splt = NULL;
754 ret->srelplt = NULL;
755 ret->sdynbss = NULL;
756 ret->srelbss = NULL;
757 ret->tls_ldm_got.refcount = 0;
758 ret->sym_cache.abfd = NULL;
759
760 return &ret->elf.root;
761 }
762
763 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
764 shortcuts to them in our hash table. */
765
766 static bfd_boolean
767 create_got_section (dynobj, info)
768 bfd *dynobj;
769 struct bfd_link_info *info;
770 {
771 struct elf_s390_link_hash_table *htab;
772
773 if (! _bfd_elf_create_got_section (dynobj, info))
774 return FALSE;
775
776 htab = elf_s390_hash_table (info);
777 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
778 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
779 htab->srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
780 if (!htab->sgot || !htab->sgotplt || !htab->srelgot)
781 abort ();
782 return TRUE;
783 }
784
785 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
786 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
787 hash table. */
788
789 static bfd_boolean
790 elf_s390_create_dynamic_sections (dynobj, info)
791 bfd *dynobj;
792 struct bfd_link_info *info;
793 {
794 struct elf_s390_link_hash_table *htab;
795
796 htab = elf_s390_hash_table (info);
797 if (!htab->sgot && !create_got_section (dynobj, info))
798 return FALSE;
799
800 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
801 return FALSE;
802
803 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
804 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
805 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
806 if (!info->shared)
807 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
808
809 if (!htab->splt || !htab->srelplt || !htab->sdynbss
810 || (!info->shared && !htab->srelbss))
811 abort ();
812
813 return TRUE;
814 }
815
816 /* Copy the extra info we tack onto an elf_link_hash_entry. */
817
818 static void
819 elf_s390_copy_indirect_symbol (info, dir, ind)
820 struct bfd_link_info *info;
821 struct elf_link_hash_entry *dir, *ind;
822 {
823 struct elf_s390_link_hash_entry *edir, *eind;
824
825 edir = (struct elf_s390_link_hash_entry *) dir;
826 eind = (struct elf_s390_link_hash_entry *) ind;
827
828 if (eind->dyn_relocs != NULL)
829 {
830 if (edir->dyn_relocs != NULL)
831 {
832 struct elf_s390_dyn_relocs **pp;
833 struct elf_s390_dyn_relocs *p;
834
835 /* Add reloc counts against the indirect sym to the direct sym
836 list. Merge any entries against the same section. */
837 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
838 {
839 struct elf_s390_dyn_relocs *q;
840
841 for (q = edir->dyn_relocs; q != NULL; q = q->next)
842 if (q->sec == p->sec)
843 {
844 q->pc_count += p->pc_count;
845 q->count += p->count;
846 *pp = p->next;
847 break;
848 }
849 if (q == NULL)
850 pp = &p->next;
851 }
852 *pp = edir->dyn_relocs;
853 }
854
855 edir->dyn_relocs = eind->dyn_relocs;
856 eind->dyn_relocs = NULL;
857 }
858
859 if (ind->root.type == bfd_link_hash_indirect
860 && dir->got.refcount <= 0)
861 {
862 edir->tls_type = eind->tls_type;
863 eind->tls_type = GOT_UNKNOWN;
864 }
865
866 if (ELIMINATE_COPY_RELOCS
867 && ind->root.type != bfd_link_hash_indirect
868 && dir->dynamic_adjusted)
869 {
870 /* If called to transfer flags for a weakdef during processing
871 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
872 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
873 dir->ref_dynamic |= ind->ref_dynamic;
874 dir->ref_regular |= ind->ref_regular;
875 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
876 dir->needs_plt |= ind->needs_plt;
877 }
878 else
879 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
880 }
881
882 static int
883 elf_s390_tls_transition (info, r_type, is_local)
884 struct bfd_link_info *info;
885 int r_type;
886 int is_local;
887 {
888 if (info->shared)
889 return r_type;
890
891 switch (r_type)
892 {
893 case R_390_TLS_GD64:
894 case R_390_TLS_IE64:
895 if (is_local)
896 return R_390_TLS_LE64;
897 return R_390_TLS_IE64;
898 case R_390_TLS_GOTIE64:
899 if (is_local)
900 return R_390_TLS_LE64;
901 return R_390_TLS_GOTIE64;
902 case R_390_TLS_LDM64:
903 return R_390_TLS_LE64;
904 }
905
906 return r_type;
907 }
908
909 /* Look through the relocs for a section during the first phase, and
910 allocate space in the global offset table or procedure linkage
911 table. */
912
913 static bfd_boolean
914 elf_s390_check_relocs (abfd, info, sec, relocs)
915 bfd *abfd;
916 struct bfd_link_info *info;
917 asection *sec;
918 const Elf_Internal_Rela *relocs;
919 {
920 struct elf_s390_link_hash_table *htab;
921 Elf_Internal_Shdr *symtab_hdr;
922 struct elf_link_hash_entry **sym_hashes;
923 const Elf_Internal_Rela *rel;
924 const Elf_Internal_Rela *rel_end;
925 asection *sreloc;
926 bfd_signed_vma *local_got_refcounts;
927 int tls_type, old_tls_type;
928
929 if (info->relocatable)
930 return TRUE;
931
932 BFD_ASSERT (is_s390_elf (abfd));
933
934 htab = elf_s390_hash_table (info);
935 symtab_hdr = &elf_symtab_hdr (abfd);
936 sym_hashes = elf_sym_hashes (abfd);
937 local_got_refcounts = elf_local_got_refcounts (abfd);
938
939 sreloc = NULL;
940
941 rel_end = relocs + sec->reloc_count;
942 for (rel = relocs; rel < rel_end; rel++)
943 {
944 unsigned int r_type;
945 unsigned long r_symndx;
946 struct elf_link_hash_entry *h;
947
948 r_symndx = ELF64_R_SYM (rel->r_info);
949
950 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
951 {
952 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
953 abfd,
954 r_symndx);
955 return FALSE;
956 }
957
958 if (r_symndx < symtab_hdr->sh_info)
959 h = NULL;
960 else
961 {
962 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
963 while (h->root.type == bfd_link_hash_indirect
964 || h->root.type == bfd_link_hash_warning)
965 h = (struct elf_link_hash_entry *) h->root.u.i.link;
966 }
967
968 /* Create got section and local_got_refcounts array if they
969 are needed. */
970 r_type = elf_s390_tls_transition (info,
971 ELF64_R_TYPE (rel->r_info),
972 h == NULL);
973 switch (r_type)
974 {
975 case R_390_GOT12:
976 case R_390_GOT16:
977 case R_390_GOT20:
978 case R_390_GOT32:
979 case R_390_GOT64:
980 case R_390_GOTENT:
981 case R_390_GOTPLT12:
982 case R_390_GOTPLT16:
983 case R_390_GOTPLT20:
984 case R_390_GOTPLT32:
985 case R_390_GOTPLT64:
986 case R_390_GOTPLTENT:
987 case R_390_TLS_GD64:
988 case R_390_TLS_GOTIE12:
989 case R_390_TLS_GOTIE20:
990 case R_390_TLS_GOTIE64:
991 case R_390_TLS_IEENT:
992 case R_390_TLS_IE64:
993 case R_390_TLS_LDM64:
994 if (h == NULL
995 && local_got_refcounts == NULL)
996 {
997 bfd_size_type size;
998
999 size = symtab_hdr->sh_info;
1000 size *= (sizeof (bfd_signed_vma) + sizeof(char));
1001 local_got_refcounts = ((bfd_signed_vma *)
1002 bfd_zalloc (abfd, size));
1003 if (local_got_refcounts == NULL)
1004 return FALSE;
1005 elf_local_got_refcounts (abfd) = local_got_refcounts;
1006 elf_s390_local_got_tls_type (abfd)
1007 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1008 }
1009 /* Fall through. */
1010 case R_390_GOTOFF16:
1011 case R_390_GOTOFF32:
1012 case R_390_GOTOFF64:
1013 case R_390_GOTPC:
1014 case R_390_GOTPCDBL:
1015 if (htab->sgot == NULL)
1016 {
1017 if (htab->elf.dynobj == NULL)
1018 htab->elf.dynobj = abfd;
1019 if (!create_got_section (htab->elf.dynobj, info))
1020 return FALSE;
1021 }
1022 }
1023
1024 switch (r_type)
1025 {
1026 case R_390_GOTOFF16:
1027 case R_390_GOTOFF32:
1028 case R_390_GOTOFF64:
1029 case R_390_GOTPC:
1030 case R_390_GOTPCDBL:
1031 /* Got is created, nothing to be done. */
1032 break;
1033
1034 case R_390_PLT16DBL:
1035 case R_390_PLT32:
1036 case R_390_PLT32DBL:
1037 case R_390_PLT64:
1038 case R_390_PLTOFF16:
1039 case R_390_PLTOFF32:
1040 case R_390_PLTOFF64:
1041 /* This symbol requires a procedure linkage table entry. We
1042 actually build the entry in adjust_dynamic_symbol,
1043 because this might be a case of linking PIC code which is
1044 never referenced by a dynamic object, in which case we
1045 don't need to generate a procedure linkage table entry
1046 after all. */
1047
1048 /* If this is a local symbol, we resolve it directly without
1049 creating a procedure linkage table entry. */
1050 if (h != NULL)
1051 {
1052 h->needs_plt = 1;
1053 h->plt.refcount += 1;
1054 }
1055 break;
1056
1057 case R_390_GOTPLT12:
1058 case R_390_GOTPLT16:
1059 case R_390_GOTPLT20:
1060 case R_390_GOTPLT32:
1061 case R_390_GOTPLT64:
1062 case R_390_GOTPLTENT:
1063 /* This symbol requires either a procedure linkage table entry
1064 or an entry in the local got. We actually build the entry
1065 in adjust_dynamic_symbol because whether this is really a
1066 global reference can change and with it the fact if we have
1067 to create a plt entry or a local got entry. To be able to
1068 make a once global symbol a local one we have to keep track
1069 of the number of gotplt references that exist for this
1070 symbol. */
1071 if (h != NULL)
1072 {
1073 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1074 h->needs_plt = 1;
1075 h->plt.refcount += 1;
1076 }
1077 else
1078 local_got_refcounts[r_symndx] += 1;
1079 break;
1080
1081 case R_390_TLS_LDM64:
1082 htab->tls_ldm_got.refcount += 1;
1083 break;
1084
1085 case R_390_TLS_IE64:
1086 case R_390_TLS_GOTIE12:
1087 case R_390_TLS_GOTIE20:
1088 case R_390_TLS_GOTIE64:
1089 case R_390_TLS_IEENT:
1090 if (info->shared)
1091 info->flags |= DF_STATIC_TLS;
1092 /* Fall through */
1093
1094 case R_390_GOT12:
1095 case R_390_GOT16:
1096 case R_390_GOT20:
1097 case R_390_GOT32:
1098 case R_390_GOT64:
1099 case R_390_GOTENT:
1100 case R_390_TLS_GD64:
1101 /* This symbol requires a global offset table entry. */
1102 switch (r_type)
1103 {
1104 default:
1105 case R_390_GOT12:
1106 case R_390_GOT16:
1107 case R_390_GOT20:
1108 case R_390_GOT32:
1109 case R_390_GOTENT:
1110 tls_type = GOT_NORMAL;
1111 break;
1112 case R_390_TLS_GD64:
1113 tls_type = GOT_TLS_GD;
1114 break;
1115 case R_390_TLS_IE64:
1116 case R_390_TLS_GOTIE64:
1117 tls_type = GOT_TLS_IE;
1118 break;
1119 case R_390_TLS_GOTIE12:
1120 case R_390_TLS_GOTIE20:
1121 case R_390_TLS_IEENT:
1122 tls_type = GOT_TLS_IE_NLT;
1123 break;
1124 }
1125
1126 if (h != NULL)
1127 {
1128 h->got.refcount += 1;
1129 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1130 }
1131 else
1132 {
1133 local_got_refcounts[r_symndx] += 1;
1134 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1135 }
1136 /* If a TLS symbol is accessed using IE at least once,
1137 there is no point to use dynamic model for it. */
1138 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1139 {
1140 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1141 {
1142 (*_bfd_error_handler)
1143 (_("%B: `%s' accessed both as normal and thread local symbol"),
1144 abfd, h->root.root.string);
1145 return FALSE;
1146 }
1147 if (old_tls_type > tls_type)
1148 tls_type = old_tls_type;
1149 }
1150
1151 if (old_tls_type != tls_type)
1152 {
1153 if (h != NULL)
1154 elf_s390_hash_entry (h)->tls_type = tls_type;
1155 else
1156 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1157 }
1158
1159 if (r_type != R_390_TLS_IE64)
1160 break;
1161 /* Fall through */
1162
1163 case R_390_TLS_LE64:
1164 if (!info->shared)
1165 break;
1166 info->flags |= DF_STATIC_TLS;
1167 /* Fall through */
1168
1169 case R_390_8:
1170 case R_390_16:
1171 case R_390_32:
1172 case R_390_64:
1173 case R_390_PC16:
1174 case R_390_PC16DBL:
1175 case R_390_PC32:
1176 case R_390_PC32DBL:
1177 case R_390_PC64:
1178 if (h != NULL && !info->shared)
1179 {
1180 /* If this reloc is in a read-only section, we might
1181 need a copy reloc. We can't check reliably at this
1182 stage whether the section is read-only, as input
1183 sections have not yet been mapped to output sections.
1184 Tentatively set the flag for now, and correct in
1185 adjust_dynamic_symbol. */
1186 h->non_got_ref = 1;
1187
1188 /* We may need a .plt entry if the function this reloc
1189 refers to is in a shared lib. */
1190 h->plt.refcount += 1;
1191 }
1192
1193 /* If we are creating a shared library, and this is a reloc
1194 against a global symbol, or a non PC relative reloc
1195 against a local symbol, then we need to copy the reloc
1196 into the shared library. However, if we are linking with
1197 -Bsymbolic, we do not need to copy a reloc against a
1198 global symbol which is defined in an object we are
1199 including in the link (i.e., DEF_REGULAR is set). At
1200 this point we have not seen all the input files, so it is
1201 possible that DEF_REGULAR is not set now but will be set
1202 later (it is never cleared). In case of a weak definition,
1203 DEF_REGULAR may be cleared later by a strong definition in
1204 a shared library. We account for that possibility below by
1205 storing information in the relocs_copied field of the hash
1206 table entry. A similar situation occurs when creating
1207 shared libraries and symbol visibility changes render the
1208 symbol local.
1209
1210 If on the other hand, we are creating an executable, we
1211 may need to keep relocations for symbols satisfied by a
1212 dynamic library if we manage to avoid copy relocs for the
1213 symbol. */
1214 if ((info->shared
1215 && (sec->flags & SEC_ALLOC) != 0
1216 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
1217 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
1218 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
1219 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
1220 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
1221 || (h != NULL
1222 && (! SYMBOLIC_BIND (info, h)
1223 || h->root.type == bfd_link_hash_defweak
1224 || !h->def_regular))))
1225 || (ELIMINATE_COPY_RELOCS
1226 && !info->shared
1227 && (sec->flags & SEC_ALLOC) != 0
1228 && h != NULL
1229 && (h->root.type == bfd_link_hash_defweak
1230 || !h->def_regular)))
1231 {
1232 struct elf_s390_dyn_relocs *p;
1233 struct elf_s390_dyn_relocs **head;
1234
1235 /* We must copy these reloc types into the output file.
1236 Create a reloc section in dynobj and make room for
1237 this reloc. */
1238 if (sreloc == NULL)
1239 {
1240 if (htab->elf.dynobj == NULL)
1241 htab->elf.dynobj = abfd;
1242
1243 sreloc = _bfd_elf_make_dynamic_reloc_section
1244 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ TRUE);
1245
1246 if (sreloc == NULL)
1247 return FALSE;
1248 }
1249
1250 /* If this is a global symbol, we count the number of
1251 relocations we need for this symbol. */
1252 if (h != NULL)
1253 {
1254 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1255 }
1256 else
1257 {
1258 /* Track dynamic relocs needed for local syms too.
1259 We really need local syms available to do this
1260 easily. Oh well. */
1261 asection *s;
1262 void *vpp;
1263 Elf_Internal_Sym *isym;
1264
1265 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1266 abfd, r_symndx);
1267 if (isym == NULL)
1268 return FALSE;
1269
1270 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1271 if (s == NULL)
1272 s = sec;
1273
1274 vpp = &elf_section_data (s)->local_dynrel;
1275 head = (struct elf_s390_dyn_relocs **) vpp;
1276 }
1277
1278 p = *head;
1279 if (p == NULL || p->sec != sec)
1280 {
1281 bfd_size_type amt = sizeof *p;
1282 p = ((struct elf_s390_dyn_relocs *)
1283 bfd_alloc (htab->elf.dynobj, amt));
1284 if (p == NULL)
1285 return FALSE;
1286 p->next = *head;
1287 *head = p;
1288 p->sec = sec;
1289 p->count = 0;
1290 p->pc_count = 0;
1291 }
1292
1293 p->count += 1;
1294 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
1295 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1296 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
1297 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
1298 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
1299 p->pc_count += 1;
1300 }
1301 break;
1302
1303 /* This relocation describes the C++ object vtable hierarchy.
1304 Reconstruct it for later use during GC. */
1305 case R_390_GNU_VTINHERIT:
1306 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1307 return FALSE;
1308 break;
1309
1310 /* This relocation describes which C++ vtable entries are actually
1311 used. Record for later use during GC. */
1312 case R_390_GNU_VTENTRY:
1313 BFD_ASSERT (h != NULL);
1314 if (h != NULL
1315 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1316 return FALSE;
1317 break;
1318
1319 default:
1320 break;
1321 }
1322 }
1323
1324 return TRUE;
1325 }
1326
1327 /* Return the section that should be marked against GC for a given
1328 relocation. */
1329
1330 static asection *
1331 elf_s390_gc_mark_hook (asection *sec,
1332 struct bfd_link_info *info,
1333 Elf_Internal_Rela *rel,
1334 struct elf_link_hash_entry *h,
1335 Elf_Internal_Sym *sym)
1336 {
1337 if (h != NULL)
1338 switch (ELF64_R_TYPE (rel->r_info))
1339 {
1340 case R_390_GNU_VTINHERIT:
1341 case R_390_GNU_VTENTRY:
1342 return NULL;
1343 }
1344
1345 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1346 }
1347
1348 /* Update the got entry reference counts for the section being removed. */
1349
1350 static bfd_boolean
1351 elf_s390_gc_sweep_hook (bfd *abfd,
1352 struct bfd_link_info *info,
1353 asection *sec,
1354 const Elf_Internal_Rela *relocs)
1355 {
1356 Elf_Internal_Shdr *symtab_hdr;
1357 struct elf_link_hash_entry **sym_hashes;
1358 bfd_signed_vma *local_got_refcounts;
1359 const Elf_Internal_Rela *rel, *relend;
1360
1361 if (info->relocatable)
1362 return TRUE;
1363
1364 elf_section_data (sec)->local_dynrel = NULL;
1365
1366 symtab_hdr = &elf_symtab_hdr (abfd);
1367 sym_hashes = elf_sym_hashes (abfd);
1368 local_got_refcounts = elf_local_got_refcounts (abfd);
1369
1370 relend = relocs + sec->reloc_count;
1371 for (rel = relocs; rel < relend; rel++)
1372 {
1373 unsigned long r_symndx;
1374 unsigned int r_type;
1375 struct elf_link_hash_entry *h = NULL;
1376
1377 r_symndx = ELF64_R_SYM (rel->r_info);
1378 if (r_symndx >= symtab_hdr->sh_info)
1379 {
1380 struct elf_s390_link_hash_entry *eh;
1381 struct elf_s390_dyn_relocs **pp;
1382 struct elf_s390_dyn_relocs *p;
1383
1384 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1385 while (h->root.type == bfd_link_hash_indirect
1386 || h->root.type == bfd_link_hash_warning)
1387 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1388 eh = (struct elf_s390_link_hash_entry *) h;
1389
1390 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1391 if (p->sec == sec)
1392 {
1393 /* Everything must go for SEC. */
1394 *pp = p->next;
1395 break;
1396 }
1397 }
1398
1399 r_type = ELF64_R_TYPE (rel->r_info);
1400 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1401 switch (r_type)
1402 {
1403 case R_390_TLS_LDM64:
1404 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1405 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1406 break;
1407
1408 case R_390_TLS_GD64:
1409 case R_390_TLS_IE64:
1410 case R_390_TLS_GOTIE12:
1411 case R_390_TLS_GOTIE20:
1412 case R_390_TLS_GOTIE64:
1413 case R_390_TLS_IEENT:
1414 case R_390_GOT12:
1415 case R_390_GOT16:
1416 case R_390_GOT20:
1417 case R_390_GOT32:
1418 case R_390_GOT64:
1419 case R_390_GOTOFF16:
1420 case R_390_GOTOFF32:
1421 case R_390_GOTOFF64:
1422 case R_390_GOTPC:
1423 case R_390_GOTPCDBL:
1424 case R_390_GOTENT:
1425 if (h != NULL)
1426 {
1427 if (h->got.refcount > 0)
1428 h->got.refcount -= 1;
1429 }
1430 else if (local_got_refcounts != NULL)
1431 {
1432 if (local_got_refcounts[r_symndx] > 0)
1433 local_got_refcounts[r_symndx] -= 1;
1434 }
1435 break;
1436
1437 case R_390_8:
1438 case R_390_12:
1439 case R_390_16:
1440 case R_390_20:
1441 case R_390_32:
1442 case R_390_64:
1443 case R_390_PC16:
1444 case R_390_PC16DBL:
1445 case R_390_PC32:
1446 case R_390_PC32DBL:
1447 case R_390_PC64:
1448 if (info->shared)
1449 break;
1450 /* Fall through */
1451
1452 case R_390_PLT16DBL:
1453 case R_390_PLT32:
1454 case R_390_PLT32DBL:
1455 case R_390_PLT64:
1456 case R_390_PLTOFF16:
1457 case R_390_PLTOFF32:
1458 case R_390_PLTOFF64:
1459 if (h != NULL)
1460 {
1461 if (h->plt.refcount > 0)
1462 h->plt.refcount -= 1;
1463 }
1464 break;
1465
1466 case R_390_GOTPLT12:
1467 case R_390_GOTPLT16:
1468 case R_390_GOTPLT20:
1469 case R_390_GOTPLT32:
1470 case R_390_GOTPLT64:
1471 case R_390_GOTPLTENT:
1472 if (h != NULL)
1473 {
1474 if (h->plt.refcount > 0)
1475 {
1476 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1477 h->plt.refcount -= 1;
1478 }
1479 }
1480 else if (local_got_refcounts != NULL)
1481 {
1482 if (local_got_refcounts[r_symndx] > 0)
1483 local_got_refcounts[r_symndx] -= 1;
1484 }
1485 break;
1486
1487 default:
1488 break;
1489 }
1490 }
1491
1492 return TRUE;
1493 }
1494
1495 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1496 entry but we found we will not create any. Called when we find we will
1497 not have any PLT for this symbol, by for example
1498 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1499 or elf_s390_size_dynamic_sections if no dynamic sections will be
1500 created (we're only linking static objects). */
1501
1502 static void
1503 elf_s390_adjust_gotplt (h)
1504 struct elf_s390_link_hash_entry *h;
1505 {
1506 if (h->elf.root.type == bfd_link_hash_warning)
1507 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1508
1509 if (h->gotplt_refcount <= 0)
1510 return;
1511
1512 /* We simply add the number of gotplt references to the number
1513 * of got references for this symbol. */
1514 h->elf.got.refcount += h->gotplt_refcount;
1515 h->gotplt_refcount = -1;
1516 }
1517
1518 /* Adjust a symbol defined by a dynamic object and referenced by a
1519 regular object. The current definition is in some section of the
1520 dynamic object, but we're not including those sections. We have to
1521 change the definition to something the rest of the link can
1522 understand. */
1523
1524 static bfd_boolean
1525 elf_s390_adjust_dynamic_symbol (info, h)
1526 struct bfd_link_info *info;
1527 struct elf_link_hash_entry *h;
1528 {
1529 struct elf_s390_link_hash_table *htab;
1530 asection *s;
1531
1532 /* If this is a function, put it in the procedure linkage table. We
1533 will fill in the contents of the procedure linkage table later
1534 (although we could actually do it here). */
1535 if (h->type == STT_FUNC
1536 || h->needs_plt)
1537 {
1538 if (h->plt.refcount <= 0
1539 || SYMBOL_CALLS_LOCAL (info, h)
1540 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1541 && h->root.type == bfd_link_hash_undefweak))
1542 {
1543 /* This case can occur if we saw a PLT32 reloc in an input
1544 file, but the symbol was never referred to by a dynamic
1545 object, or if all references were garbage collected. In
1546 such a case, we don't actually need to build a procedure
1547 linkage table, and we can just do a PC32 reloc instead. */
1548 h->plt.offset = (bfd_vma) -1;
1549 h->needs_plt = 0;
1550 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1551 }
1552
1553 return TRUE;
1554 }
1555 else
1556 /* It's possible that we incorrectly decided a .plt reloc was
1557 needed for an R_390_PC32 reloc to a non-function sym in
1558 check_relocs. We can't decide accurately between function and
1559 non-function syms in check-relocs; Objects loaded later in
1560 the link may change h->type. So fix it now. */
1561 h->plt.offset = (bfd_vma) -1;
1562
1563 /* If this is a weak symbol, and there is a real definition, the
1564 processor independent code will have arranged for us to see the
1565 real definition first, and we can just use the same value. */
1566 if (h->u.weakdef != NULL)
1567 {
1568 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1569 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1570 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1571 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1572 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1573 h->non_got_ref = h->u.weakdef->non_got_ref;
1574 return TRUE;
1575 }
1576
1577 /* This is a reference to a symbol defined by a dynamic object which
1578 is not a function. */
1579
1580 /* If we are creating a shared library, we must presume that the
1581 only references to the symbol are via the global offset table.
1582 For such cases we need not do anything here; the relocations will
1583 be handled correctly by relocate_section. */
1584 if (info->shared)
1585 return TRUE;
1586
1587 /* If there are no references to this symbol that do not use the
1588 GOT, we don't need to generate a copy reloc. */
1589 if (!h->non_got_ref)
1590 return TRUE;
1591
1592 /* If -z nocopyreloc was given, we won't generate them either. */
1593 if (info->nocopyreloc)
1594 {
1595 h->non_got_ref = 0;
1596 return TRUE;
1597 }
1598
1599 if (ELIMINATE_COPY_RELOCS)
1600 {
1601 struct elf_s390_link_hash_entry * eh;
1602 struct elf_s390_dyn_relocs *p;
1603
1604 eh = (struct elf_s390_link_hash_entry *) h;
1605 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1606 {
1607 s = p->sec->output_section;
1608 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1609 break;
1610 }
1611
1612 /* If we didn't find any dynamic relocs in read-only sections, then
1613 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1614 if (p == NULL)
1615 {
1616 h->non_got_ref = 0;
1617 return TRUE;
1618 }
1619 }
1620
1621 if (h->size == 0)
1622 {
1623 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1624 h->root.root.string);
1625 return TRUE;
1626 }
1627
1628 /* We must allocate the symbol in our .dynbss section, which will
1629 become part of the .bss section of the executable. There will be
1630 an entry for this symbol in the .dynsym section. The dynamic
1631 object will contain position independent code, so all references
1632 from the dynamic object to this symbol will go through the global
1633 offset table. The dynamic linker will use the .dynsym entry to
1634 determine the address it must put in the global offset table, so
1635 both the dynamic object and the regular object will refer to the
1636 same memory location for the variable. */
1637
1638 htab = elf_s390_hash_table (info);
1639
1640 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1641 copy the initial value out of the dynamic object and into the
1642 runtime process image. */
1643 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1644 {
1645 htab->srelbss->size += sizeof (Elf64_External_Rela);
1646 h->needs_copy = 1;
1647 }
1648
1649 s = htab->sdynbss;
1650
1651 return _bfd_elf_adjust_dynamic_copy (h, s);
1652 }
1653
1654 /* Allocate space in .plt, .got and associated reloc sections for
1655 dynamic relocs. */
1656
1657 static bfd_boolean
1658 allocate_dynrelocs (h, inf)
1659 struct elf_link_hash_entry *h;
1660 PTR inf;
1661 {
1662 struct bfd_link_info *info;
1663 struct elf_s390_link_hash_table *htab;
1664 struct elf_s390_link_hash_entry *eh;
1665 struct elf_s390_dyn_relocs *p;
1666
1667 if (h->root.type == bfd_link_hash_indirect)
1668 return TRUE;
1669
1670 if (h->root.type == bfd_link_hash_warning)
1671 /* When warning symbols are created, they **replace** the "real"
1672 entry in the hash table, thus we never get to see the real
1673 symbol in a hash traversal. So look at it now. */
1674 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1675
1676 info = (struct bfd_link_info *) inf;
1677 htab = elf_s390_hash_table (info);
1678
1679 if (htab->elf.dynamic_sections_created
1680 && h->plt.refcount > 0)
1681 {
1682 /* Make sure this symbol is output as a dynamic symbol.
1683 Undefined weak syms won't yet be marked as dynamic. */
1684 if (h->dynindx == -1
1685 && !h->forced_local)
1686 {
1687 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1688 return FALSE;
1689 }
1690
1691 if (info->shared
1692 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1693 {
1694 asection *s = htab->splt;
1695
1696 /* If this is the first .plt entry, make room for the special
1697 first entry. */
1698 if (s->size == 0)
1699 s->size += PLT_FIRST_ENTRY_SIZE;
1700
1701 h->plt.offset = s->size;
1702
1703 /* If this symbol is not defined in a regular file, and we are
1704 not generating a shared library, then set the symbol to this
1705 location in the .plt. This is required to make function
1706 pointers compare as equal between the normal executable and
1707 the shared library. */
1708 if (! info->shared
1709 && !h->def_regular)
1710 {
1711 h->root.u.def.section = s;
1712 h->root.u.def.value = h->plt.offset;
1713 }
1714
1715 /* Make room for this entry. */
1716 s->size += PLT_ENTRY_SIZE;
1717
1718 /* We also need to make an entry in the .got.plt section, which
1719 will be placed in the .got section by the linker script. */
1720 htab->sgotplt->size += GOT_ENTRY_SIZE;
1721
1722 /* We also need to make an entry in the .rela.plt section. */
1723 htab->srelplt->size += sizeof (Elf64_External_Rela);
1724 }
1725 else
1726 {
1727 h->plt.offset = (bfd_vma) -1;
1728 h->needs_plt = 0;
1729 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1730 }
1731 }
1732 else
1733 {
1734 h->plt.offset = (bfd_vma) -1;
1735 h->needs_plt = 0;
1736 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1737 }
1738
1739 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to
1740 the binary, we can optimize a bit. IE64 and GOTIE64 get converted
1741 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT
1742 we can save the dynamic TLS relocation. */
1743 if (h->got.refcount > 0
1744 && !info->shared
1745 && h->dynindx == -1
1746 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1747 {
1748 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1749 /* For the GOTIE access without a literal pool entry the offset has
1750 to be stored somewhere. The immediate value in the instruction
1751 is not bit enough so the value is stored in the got. */
1752 {
1753 h->got.offset = htab->sgot->size;
1754 htab->sgot->size += GOT_ENTRY_SIZE;
1755 }
1756 else
1757 h->got.offset = (bfd_vma) -1;
1758 }
1759 else if (h->got.refcount > 0)
1760 {
1761 asection *s;
1762 bfd_boolean dyn;
1763 int tls_type = elf_s390_hash_entry(h)->tls_type;
1764
1765 /* Make sure this symbol is output as a dynamic symbol.
1766 Undefined weak syms won't yet be marked as dynamic. */
1767 if (h->dynindx == -1
1768 && !h->forced_local)
1769 {
1770 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1771 return FALSE;
1772 }
1773
1774 s = htab->sgot;
1775 h->got.offset = s->size;
1776 s->size += GOT_ENTRY_SIZE;
1777 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */
1778 if (tls_type == GOT_TLS_GD)
1779 s->size += GOT_ENTRY_SIZE;
1780 dyn = htab->elf.dynamic_sections_created;
1781 /* R_390_TLS_IE64 needs one dynamic relocation,
1782 R_390_TLS_GD64 needs one if local symbol and two if global. */
1783 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1784 || tls_type >= GOT_TLS_IE)
1785 htab->srelgot->size += sizeof (Elf64_External_Rela);
1786 else if (tls_type == GOT_TLS_GD)
1787 htab->srelgot->size += 2 * sizeof (Elf64_External_Rela);
1788 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1789 || h->root.type != bfd_link_hash_undefweak)
1790 && (info->shared
1791 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1792 htab->srelgot->size += sizeof (Elf64_External_Rela);
1793 }
1794 else
1795 h->got.offset = (bfd_vma) -1;
1796
1797 eh = (struct elf_s390_link_hash_entry *) h;
1798 if (eh->dyn_relocs == NULL)
1799 return TRUE;
1800
1801 /* In the shared -Bsymbolic case, discard space allocated for
1802 dynamic pc-relative relocs against symbols which turn out to be
1803 defined in regular objects. For the normal shared case, discard
1804 space for pc-relative relocs that have become local due to symbol
1805 visibility changes. */
1806
1807 if (info->shared)
1808 {
1809 if (SYMBOL_CALLS_LOCAL (info, h))
1810 {
1811 struct elf_s390_dyn_relocs **pp;
1812
1813 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1814 {
1815 p->count -= p->pc_count;
1816 p->pc_count = 0;
1817 if (p->count == 0)
1818 *pp = p->next;
1819 else
1820 pp = &p->next;
1821 }
1822 }
1823
1824 /* Also discard relocs on undefined weak syms with non-default
1825 visibility. */
1826 if (eh->dyn_relocs != NULL
1827 && h->root.type == bfd_link_hash_undefweak)
1828 {
1829 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1830 eh->dyn_relocs = NULL;
1831
1832 /* Make sure undefined weak symbols are output as a dynamic
1833 symbol in PIEs. */
1834 else if (h->dynindx == -1
1835 && !h->forced_local)
1836 {
1837 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1838 return FALSE;
1839 }
1840 }
1841 }
1842 else if (ELIMINATE_COPY_RELOCS)
1843 {
1844 /* For the non-shared case, discard space for relocs against
1845 symbols which turn out to need copy relocs or are not
1846 dynamic. */
1847
1848 if (!h->non_got_ref
1849 && ((h->def_dynamic
1850 && !h->def_regular)
1851 || (htab->elf.dynamic_sections_created
1852 && (h->root.type == bfd_link_hash_undefweak
1853 || h->root.type == bfd_link_hash_undefined))))
1854 {
1855 /* Make sure this symbol is output as a dynamic symbol.
1856 Undefined weak syms won't yet be marked as dynamic. */
1857 if (h->dynindx == -1
1858 && !h->forced_local)
1859 {
1860 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1861 return FALSE;
1862 }
1863
1864 /* If that succeeded, we know we'll be keeping all the
1865 relocs. */
1866 if (h->dynindx != -1)
1867 goto keep;
1868 }
1869
1870 eh->dyn_relocs = NULL;
1871
1872 keep: ;
1873 }
1874
1875 /* Finally, allocate space. */
1876 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1877 {
1878 asection *sreloc = elf_section_data (p->sec)->sreloc;
1879 sreloc->size += p->count * sizeof (Elf64_External_Rela);
1880 }
1881
1882 return TRUE;
1883 }
1884
1885 /* Find any dynamic relocs that apply to read-only sections. */
1886
1887 static bfd_boolean
1888 readonly_dynrelocs (h, inf)
1889 struct elf_link_hash_entry *h;
1890 PTR inf;
1891 {
1892 struct elf_s390_link_hash_entry *eh;
1893 struct elf_s390_dyn_relocs *p;
1894
1895 if (h->root.type == bfd_link_hash_warning)
1896 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1897
1898 eh = (struct elf_s390_link_hash_entry *) h;
1899 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1900 {
1901 asection *s = p->sec->output_section;
1902
1903 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1904 {
1905 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1906
1907 info->flags |= DF_TEXTREL;
1908
1909 /* Not an error, just cut short the traversal. */
1910 return FALSE;
1911 }
1912 }
1913 return TRUE;
1914 }
1915
1916 /* Set the sizes of the dynamic sections. */
1917
1918 static bfd_boolean
1919 elf_s390_size_dynamic_sections (output_bfd, info)
1920 bfd *output_bfd ATTRIBUTE_UNUSED;
1921 struct bfd_link_info *info;
1922 {
1923 struct elf_s390_link_hash_table *htab;
1924 bfd *dynobj;
1925 asection *s;
1926 bfd_boolean relocs;
1927 bfd *ibfd;
1928
1929 htab = elf_s390_hash_table (info);
1930 dynobj = htab->elf.dynobj;
1931 if (dynobj == NULL)
1932 abort ();
1933
1934 if (htab->elf.dynamic_sections_created)
1935 {
1936 /* Set the contents of the .interp section to the interpreter. */
1937 if (info->executable)
1938 {
1939 s = bfd_get_section_by_name (dynobj, ".interp");
1940 if (s == NULL)
1941 abort ();
1942 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1943 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1944 }
1945 }
1946
1947 /* Set up .got offsets for local syms, and space for local dynamic
1948 relocs. */
1949 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1950 {
1951 bfd_signed_vma *local_got;
1952 bfd_signed_vma *end_local_got;
1953 char *local_tls_type;
1954 bfd_size_type locsymcount;
1955 Elf_Internal_Shdr *symtab_hdr;
1956 asection *srela;
1957
1958 if (! is_s390_elf (ibfd))
1959 continue;
1960
1961 for (s = ibfd->sections; s != NULL; s = s->next)
1962 {
1963 struct elf_s390_dyn_relocs *p;
1964
1965 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
1966 {
1967 if (!bfd_is_abs_section (p->sec)
1968 && bfd_is_abs_section (p->sec->output_section))
1969 {
1970 /* Input section has been discarded, either because
1971 it is a copy of a linkonce section or due to
1972 linker script /DISCARD/, so we'll be discarding
1973 the relocs too. */
1974 }
1975 else if (p->count != 0)
1976 {
1977 srela = elf_section_data (p->sec)->sreloc;
1978 srela->size += p->count * sizeof (Elf64_External_Rela);
1979 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1980 info->flags |= DF_TEXTREL;
1981 }
1982 }
1983 }
1984
1985 local_got = elf_local_got_refcounts (ibfd);
1986 if (!local_got)
1987 continue;
1988
1989 symtab_hdr = &elf_symtab_hdr (ibfd);
1990 locsymcount = symtab_hdr->sh_info;
1991 end_local_got = local_got + locsymcount;
1992 local_tls_type = elf_s390_local_got_tls_type (ibfd);
1993 s = htab->sgot;
1994 srela = htab->srelgot;
1995 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1996 {
1997 if (*local_got > 0)
1998 {
1999 *local_got = s->size;
2000 s->size += GOT_ENTRY_SIZE;
2001 if (*local_tls_type == GOT_TLS_GD)
2002 s->size += GOT_ENTRY_SIZE;
2003 if (info->shared)
2004 srela->size += sizeof (Elf64_External_Rela);
2005 }
2006 else
2007 *local_got = (bfd_vma) -1;
2008 }
2009 }
2010
2011 if (htab->tls_ldm_got.refcount > 0)
2012 {
2013 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64
2014 relocs. */
2015 htab->tls_ldm_got.offset = htab->sgot->size;
2016 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2017 htab->srelgot->size += sizeof (Elf64_External_Rela);
2018 }
2019 else
2020 htab->tls_ldm_got.offset = -1;
2021
2022 /* Allocate global sym .plt and .got entries, and space for global
2023 sym dynamic relocs. */
2024 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2025
2026 /* We now have determined the sizes of the various dynamic sections.
2027 Allocate memory for them. */
2028 relocs = FALSE;
2029 for (s = dynobj->sections; s != NULL; s = s->next)
2030 {
2031 if ((s->flags & SEC_LINKER_CREATED) == 0)
2032 continue;
2033
2034 if (s == htab->splt
2035 || s == htab->sgot
2036 || s == htab->sgotplt
2037 || s == htab->sdynbss)
2038 {
2039 /* Strip this section if we don't need it; see the
2040 comment below. */
2041 }
2042 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2043 {
2044 if (s->size != 0 && s != htab->srelplt)
2045 relocs = TRUE;
2046
2047 /* We use the reloc_count field as a counter if we need
2048 to copy relocs into the output file. */
2049 s->reloc_count = 0;
2050 }
2051 else
2052 {
2053 /* It's not one of our sections, so don't allocate space. */
2054 continue;
2055 }
2056
2057 if (s->size == 0)
2058 {
2059 /* If we don't need this section, strip it from the
2060 output file. This is to handle .rela.bss and
2061 .rela.plt. We must create it in
2062 create_dynamic_sections, because it must be created
2063 before the linker maps input sections to output
2064 sections. The linker does that before
2065 adjust_dynamic_symbol is called, and it is that
2066 function which decides whether anything needs to go
2067 into these sections. */
2068
2069 s->flags |= SEC_EXCLUDE;
2070 continue;
2071 }
2072
2073 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2074 continue;
2075
2076 /* Allocate memory for the section contents. We use bfd_zalloc
2077 here in case unused entries are not reclaimed before the
2078 section's contents are written out. This should not happen,
2079 but this way if it does, we get a R_390_NONE reloc instead
2080 of garbage. */
2081 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2082 if (s->contents == NULL)
2083 return FALSE;
2084 }
2085
2086 if (htab->elf.dynamic_sections_created)
2087 {
2088 /* Add some entries to the .dynamic section. We fill in the
2089 values later, in elf_s390_finish_dynamic_sections, but we
2090 must add the entries now so that we get the correct size for
2091 the .dynamic section. The DT_DEBUG entry is filled in by the
2092 dynamic linker and used by the debugger. */
2093 #define add_dynamic_entry(TAG, VAL) \
2094 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2095
2096 if (info->executable)
2097 {
2098 if (!add_dynamic_entry (DT_DEBUG, 0))
2099 return FALSE;
2100 }
2101
2102 if (htab->splt->size != 0)
2103 {
2104 if (!add_dynamic_entry (DT_PLTGOT, 0)
2105 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2106 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2107 || !add_dynamic_entry (DT_JMPREL, 0))
2108 return FALSE;
2109 }
2110
2111 if (relocs)
2112 {
2113 if (!add_dynamic_entry (DT_RELA, 0)
2114 || !add_dynamic_entry (DT_RELASZ, 0)
2115 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2116 return FALSE;
2117
2118 /* If any dynamic relocs apply to a read-only section,
2119 then we need a DT_TEXTREL entry. */
2120 if ((info->flags & DF_TEXTREL) == 0)
2121 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2122 (PTR) info);
2123
2124 if ((info->flags & DF_TEXTREL) != 0)
2125 {
2126 if (!add_dynamic_entry (DT_TEXTREL, 0))
2127 return FALSE;
2128 }
2129 }
2130 }
2131 #undef add_dynamic_entry
2132
2133 return TRUE;
2134 }
2135
2136 /* Return the base VMA address which should be subtracted from real addresses
2137 when resolving @dtpoff relocation.
2138 This is PT_TLS segment p_vaddr. */
2139
2140 static bfd_vma
2141 dtpoff_base (info)
2142 struct bfd_link_info *info;
2143 {
2144 /* If tls_sec is NULL, we should have signalled an error already. */
2145 if (elf_hash_table (info)->tls_sec == NULL)
2146 return 0;
2147 return elf_hash_table (info)->tls_sec->vma;
2148 }
2149
2150 /* Return the relocation value for @tpoff relocation
2151 if STT_TLS virtual address is ADDRESS. */
2152
2153 static bfd_vma
2154 tpoff (info, address)
2155 struct bfd_link_info *info;
2156 bfd_vma address;
2157 {
2158 struct elf_link_hash_table *htab = elf_hash_table (info);
2159
2160 /* If tls_sec is NULL, we should have signalled an error already. */
2161 if (htab->tls_sec == NULL)
2162 return 0;
2163 return htab->tls_size + htab->tls_sec->vma - address;
2164 }
2165
2166 /* Complain if TLS instruction relocation is against an invalid
2167 instruction. */
2168
2169 static void
2170 invalid_tls_insn (input_bfd, input_section, rel)
2171 bfd *input_bfd;
2172 asection *input_section;
2173 Elf_Internal_Rela *rel;
2174 {
2175 reloc_howto_type *howto;
2176
2177 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
2178 (*_bfd_error_handler)
2179 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2180 input_bfd,
2181 input_section,
2182 (long) rel->r_offset,
2183 howto->name);
2184 bfd_set_error (bfd_error_bad_value);
2185 }
2186
2187 /* Relocate a 390 ELF section. */
2188
2189 static bfd_boolean
2190 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2191 contents, relocs, local_syms, local_sections)
2192 bfd *output_bfd;
2193 struct bfd_link_info *info;
2194 bfd *input_bfd;
2195 asection *input_section;
2196 bfd_byte *contents;
2197 Elf_Internal_Rela *relocs;
2198 Elf_Internal_Sym *local_syms;
2199 asection **local_sections;
2200 {
2201 struct elf_s390_link_hash_table *htab;
2202 Elf_Internal_Shdr *symtab_hdr;
2203 struct elf_link_hash_entry **sym_hashes;
2204 bfd_vma *local_got_offsets;
2205 Elf_Internal_Rela *rel;
2206 Elf_Internal_Rela *relend;
2207
2208 BFD_ASSERT (is_s390_elf (input_bfd));
2209
2210 htab = elf_s390_hash_table (info);
2211 symtab_hdr = &elf_symtab_hdr (input_bfd);
2212 sym_hashes = elf_sym_hashes (input_bfd);
2213 local_got_offsets = elf_local_got_offsets (input_bfd);
2214
2215 rel = relocs;
2216 relend = relocs + input_section->reloc_count;
2217 for (; rel < relend; rel++)
2218 {
2219 unsigned int r_type;
2220 reloc_howto_type *howto;
2221 unsigned long r_symndx;
2222 struct elf_link_hash_entry *h;
2223 Elf_Internal_Sym *sym;
2224 asection *sec;
2225 bfd_vma off;
2226 bfd_vma relocation;
2227 bfd_boolean unresolved_reloc;
2228 bfd_reloc_status_type r;
2229 int tls_type;
2230
2231 r_type = ELF64_R_TYPE (rel->r_info);
2232 if (r_type == (int) R_390_GNU_VTINHERIT
2233 || r_type == (int) R_390_GNU_VTENTRY)
2234 continue;
2235 if (r_type >= (int) R_390_max)
2236 {
2237 bfd_set_error (bfd_error_bad_value);
2238 return FALSE;
2239 }
2240
2241 howto = elf_howto_table + r_type;
2242 r_symndx = ELF64_R_SYM (rel->r_info);
2243
2244 h = NULL;
2245 sym = NULL;
2246 sec = NULL;
2247 unresolved_reloc = FALSE;
2248 if (r_symndx < symtab_hdr->sh_info)
2249 {
2250 sym = local_syms + r_symndx;
2251 sec = local_sections[r_symndx];
2252 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2253 }
2254 else
2255 {
2256 bfd_boolean warned ATTRIBUTE_UNUSED;
2257
2258 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2259 r_symndx, symtab_hdr, sym_hashes,
2260 h, sec, relocation,
2261 unresolved_reloc, warned);
2262 }
2263
2264 if (sec != NULL && elf_discarded_section (sec))
2265 {
2266 /* For relocs against symbols from removed linkonce sections,
2267 or sections discarded by a linker script, we just want the
2268 section contents zeroed. Avoid any special processing. */
2269 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2270 rel->r_info = 0;
2271 rel->r_addend = 0;
2272 continue;
2273 }
2274
2275 if (info->relocatable)
2276 continue;
2277
2278 switch (r_type)
2279 {
2280 case R_390_GOTPLT12:
2281 case R_390_GOTPLT16:
2282 case R_390_GOTPLT20:
2283 case R_390_GOTPLT32:
2284 case R_390_GOTPLT64:
2285 case R_390_GOTPLTENT:
2286 /* There are three cases for a GOTPLT relocation. 1) The
2287 relocation is against the jump slot entry of a plt that
2288 will get emitted to the output file. 2) The relocation
2289 is against the jump slot of a plt entry that has been
2290 removed. elf_s390_adjust_gotplt has created a GOT entry
2291 as replacement. 3) The relocation is against a local symbol.
2292 Cases 2) and 3) are the same as the GOT relocation code
2293 so we just have to test for case 1 and fall through for
2294 the other two. */
2295 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2296 {
2297 bfd_vma plt_index;
2298
2299 /* Calc. index no.
2300 Current offset - size first entry / entry size. */
2301 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2302 PLT_ENTRY_SIZE;
2303
2304 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2305 addr & GOT addr. */
2306 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2307 unresolved_reloc = FALSE;
2308
2309 if (r_type == R_390_GOTPLTENT)
2310 relocation += htab->sgot->output_section->vma;
2311 break;
2312 }
2313 /* Fall through. */
2314
2315 case R_390_GOT12:
2316 case R_390_GOT16:
2317 case R_390_GOT20:
2318 case R_390_GOT32:
2319 case R_390_GOT64:
2320 case R_390_GOTENT:
2321 /* Relocation is to the entry for this symbol in the global
2322 offset table. */
2323 if (htab->sgot == NULL)
2324 abort ();
2325
2326 if (h != NULL)
2327 {
2328 bfd_boolean dyn;
2329
2330 off = h->got.offset;
2331 dyn = htab->elf.dynamic_sections_created;
2332 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2333 || (info->shared
2334 && SYMBOL_REFERENCES_LOCAL (info, h))
2335 || (ELF_ST_VISIBILITY (h->other)
2336 && h->root.type == bfd_link_hash_undefweak))
2337 {
2338 /* This is actually a static link, or it is a
2339 -Bsymbolic link and the symbol is defined
2340 locally, or the symbol was forced to be local
2341 because of a version file. We must initialize
2342 this entry in the global offset table. Since the
2343 offset must always be a multiple of 2, we use the
2344 least significant bit to record whether we have
2345 initialized it already.
2346
2347 When doing a dynamic link, we create a .rel.got
2348 relocation entry to initialize the value. This
2349 is done in the finish_dynamic_symbol routine. */
2350 if ((off & 1) != 0)
2351 off &= ~1;
2352 else
2353 {
2354 bfd_put_64 (output_bfd, relocation,
2355 htab->sgot->contents + off);
2356 h->got.offset |= 1;
2357 }
2358 }
2359 else
2360 unresolved_reloc = FALSE;
2361 }
2362 else
2363 {
2364 if (local_got_offsets == NULL)
2365 abort ();
2366
2367 off = local_got_offsets[r_symndx];
2368
2369 /* The offset must always be a multiple of 8. We use
2370 the least significant bit to record whether we have
2371 already generated the necessary reloc. */
2372 if ((off & 1) != 0)
2373 off &= ~1;
2374 else
2375 {
2376 bfd_put_64 (output_bfd, relocation,
2377 htab->sgot->contents + off);
2378
2379 if (info->shared)
2380 {
2381 asection *s;
2382 Elf_Internal_Rela outrel;
2383 bfd_byte *loc;
2384
2385 s = htab->srelgot;
2386 if (s == NULL)
2387 abort ();
2388
2389 outrel.r_offset = (htab->sgot->output_section->vma
2390 + htab->sgot->output_offset
2391 + off);
2392 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2393 outrel.r_addend = relocation;
2394 loc = s->contents;
2395 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2396 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2397 }
2398
2399 local_got_offsets[r_symndx] |= 1;
2400 }
2401 }
2402
2403 if (off >= (bfd_vma) -2)
2404 abort ();
2405
2406 relocation = htab->sgot->output_offset + off;
2407
2408 /* For @GOTENT the relocation is against the offset between
2409 the instruction and the symbols entry in the GOT and not
2410 between the start of the GOT and the symbols entry. We
2411 add the vma of the GOT to get the correct value. */
2412 if ( r_type == R_390_GOTENT
2413 || r_type == R_390_GOTPLTENT)
2414 relocation += htab->sgot->output_section->vma;
2415
2416 break;
2417
2418 case R_390_GOTOFF16:
2419 case R_390_GOTOFF32:
2420 case R_390_GOTOFF64:
2421 /* Relocation is relative to the start of the global offset
2422 table. */
2423
2424 /* Note that sgot->output_offset is not involved in this
2425 calculation. We always want the start of .got. If we
2426 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2427 permitted by the ABI, we might have to change this
2428 calculation. */
2429 relocation -= htab->sgot->output_section->vma;
2430 break;
2431
2432 case R_390_GOTPC:
2433 case R_390_GOTPCDBL:
2434 /* Use global offset table as symbol value. */
2435 relocation = htab->sgot->output_section->vma;
2436 unresolved_reloc = FALSE;
2437 break;
2438
2439 case R_390_PLT16DBL:
2440 case R_390_PLT32:
2441 case R_390_PLT32DBL:
2442 case R_390_PLT64:
2443 /* Relocation is to the entry for this symbol in the
2444 procedure linkage table. */
2445
2446 /* Resolve a PLT32 reloc against a local symbol directly,
2447 without using the procedure linkage table. */
2448 if (h == NULL)
2449 break;
2450
2451 if (h->plt.offset == (bfd_vma) -1
2452 || htab->splt == NULL)
2453 {
2454 /* We didn't make a PLT entry for this symbol. This
2455 happens when statically linking PIC code, or when
2456 using -Bsymbolic. */
2457 break;
2458 }
2459
2460 relocation = (htab->splt->output_section->vma
2461 + htab->splt->output_offset
2462 + h->plt.offset);
2463 unresolved_reloc = FALSE;
2464 break;
2465
2466 case R_390_PLTOFF16:
2467 case R_390_PLTOFF32:
2468 case R_390_PLTOFF64:
2469 /* Relocation is to the entry for this symbol in the
2470 procedure linkage table relative to the start of the GOT. */
2471
2472 /* For local symbols or if we didn't make a PLT entry for
2473 this symbol resolve the symbol directly. */
2474 if ( h == NULL
2475 || h->plt.offset == (bfd_vma) -1
2476 || htab->splt == NULL)
2477 {
2478 relocation -= htab->sgot->output_section->vma;
2479 break;
2480 }
2481
2482 relocation = (htab->splt->output_section->vma
2483 + htab->splt->output_offset
2484 + h->plt.offset
2485 - htab->sgot->output_section->vma);
2486 unresolved_reloc = FALSE;
2487 break;
2488
2489 case R_390_8:
2490 case R_390_16:
2491 case R_390_32:
2492 case R_390_64:
2493 case R_390_PC16:
2494 case R_390_PC16DBL:
2495 case R_390_PC32:
2496 case R_390_PC32DBL:
2497 case R_390_PC64:
2498 if ((input_section->flags & SEC_ALLOC) == 0)
2499 break;
2500
2501 if ((info->shared
2502 && (h == NULL
2503 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2504 || h->root.type != bfd_link_hash_undefweak)
2505 && ((r_type != R_390_PC16
2506 && r_type != R_390_PC16DBL
2507 && r_type != R_390_PC32
2508 && r_type != R_390_PC32DBL
2509 && r_type != R_390_PC64)
2510 || !SYMBOL_CALLS_LOCAL (info, h)))
2511 || (ELIMINATE_COPY_RELOCS
2512 && !info->shared
2513 && h != NULL
2514 && h->dynindx != -1
2515 && !h->non_got_ref
2516 && ((h->def_dynamic
2517 && !h->def_regular)
2518 || h->root.type == bfd_link_hash_undefweak
2519 || h->root.type == bfd_link_hash_undefined)))
2520 {
2521 Elf_Internal_Rela outrel;
2522 bfd_boolean skip, relocate;
2523 asection *sreloc;
2524 bfd_byte *loc;
2525
2526 /* When generating a shared object, these relocations
2527 are copied into the output file to be resolved at run
2528 time. */
2529 skip = FALSE;
2530 relocate = FALSE;
2531
2532 outrel.r_offset =
2533 _bfd_elf_section_offset (output_bfd, info, input_section,
2534 rel->r_offset);
2535 if (outrel.r_offset == (bfd_vma) -1)
2536 skip = TRUE;
2537 else if (outrel.r_offset == (bfd_vma) -2)
2538 skip = TRUE, relocate = TRUE;
2539
2540 outrel.r_offset += (input_section->output_section->vma
2541 + input_section->output_offset);
2542
2543 if (skip)
2544 memset (&outrel, 0, sizeof outrel);
2545 else if (h != NULL
2546 && h->dynindx != -1
2547 && (r_type == R_390_PC16
2548 || r_type == R_390_PC16DBL
2549 || r_type == R_390_PC32
2550 || r_type == R_390_PC32DBL
2551 || r_type == R_390_PC64
2552 || !info->shared
2553 || !SYMBOLIC_BIND (info, h)
2554 || !h->def_regular))
2555 {
2556 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2557 outrel.r_addend = rel->r_addend;
2558 }
2559 else
2560 {
2561 /* This symbol is local, or marked to become local. */
2562 outrel.r_addend = relocation + rel->r_addend;
2563 if (r_type == R_390_64)
2564 {
2565 relocate = TRUE;
2566 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2567 }
2568 else
2569 {
2570 long sindx;
2571
2572 if (bfd_is_abs_section (sec))
2573 sindx = 0;
2574 else if (sec == NULL || sec->owner == NULL)
2575 {
2576 bfd_set_error(bfd_error_bad_value);
2577 return FALSE;
2578 }
2579 else
2580 {
2581 asection *osec;
2582
2583 osec = sec->output_section;
2584 sindx = elf_section_data (osec)->dynindx;
2585
2586 if (sindx == 0)
2587 {
2588 osec = htab->elf.text_index_section;
2589 sindx = elf_section_data (osec)->dynindx;
2590 }
2591 BFD_ASSERT (sindx != 0);
2592
2593 /* We are turning this relocation into one
2594 against a section symbol, so subtract out
2595 the output section's address but not the
2596 offset of the input section in the output
2597 section. */
2598 outrel.r_addend -= osec->vma;
2599 }
2600 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2601 }
2602 }
2603
2604 sreloc = elf_section_data (input_section)->sreloc;
2605 if (sreloc == NULL)
2606 abort ();
2607
2608 loc = sreloc->contents;
2609 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2610 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2611
2612 /* If this reloc is against an external symbol, we do
2613 not want to fiddle with the addend. Otherwise, we
2614 need to include the symbol value so that it becomes
2615 an addend for the dynamic reloc. */
2616 if (! relocate)
2617 continue;
2618 }
2619
2620 break;
2621
2622 /* Relocations for tls literal pool entries. */
2623 case R_390_TLS_IE64:
2624 if (info->shared)
2625 {
2626 Elf_Internal_Rela outrel;
2627 asection *sreloc;
2628 bfd_byte *loc;
2629
2630 outrel.r_offset = rel->r_offset
2631 + input_section->output_section->vma
2632 + input_section->output_offset;
2633 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2634 sreloc = elf_section_data (input_section)->sreloc;
2635 if (sreloc == NULL)
2636 abort ();
2637 loc = sreloc->contents;
2638 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2639 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2640 }
2641 /* Fall through. */
2642
2643 case R_390_TLS_GD64:
2644 case R_390_TLS_GOTIE64:
2645 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2646 tls_type = GOT_UNKNOWN;
2647 if (h == NULL && local_got_offsets)
2648 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2649 else if (h != NULL)
2650 {
2651 tls_type = elf_s390_hash_entry(h)->tls_type;
2652 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2653 r_type = R_390_TLS_LE64;
2654 }
2655 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2656 r_type = R_390_TLS_IE64;
2657
2658 if (r_type == R_390_TLS_LE64)
2659 {
2660 /* This relocation gets optimized away by the local exec
2661 access optimization. */
2662 BFD_ASSERT (! unresolved_reloc);
2663 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2664 contents + rel->r_offset);
2665 continue;
2666 }
2667
2668 if (htab->sgot == NULL)
2669 abort ();
2670
2671 if (h != NULL)
2672 off = h->got.offset;
2673 else
2674 {
2675 if (local_got_offsets == NULL)
2676 abort ();
2677
2678 off = local_got_offsets[r_symndx];
2679 }
2680
2681 emit_tls_relocs:
2682
2683 if ((off & 1) != 0)
2684 off &= ~1;
2685 else
2686 {
2687 Elf_Internal_Rela outrel;
2688 bfd_byte *loc;
2689 int dr_type, indx;
2690
2691 if (htab->srelgot == NULL)
2692 abort ();
2693
2694 outrel.r_offset = (htab->sgot->output_section->vma
2695 + htab->sgot->output_offset + off);
2696
2697 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2698 if (r_type == R_390_TLS_GD64)
2699 dr_type = R_390_TLS_DTPMOD;
2700 else
2701 dr_type = R_390_TLS_TPOFF;
2702 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2703 outrel.r_addend = relocation - dtpoff_base (info);
2704 else
2705 outrel.r_addend = 0;
2706 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2707 loc = htab->srelgot->contents;
2708 loc += htab->srelgot->reloc_count++
2709 * sizeof (Elf64_External_Rela);
2710 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2711
2712 if (r_type == R_390_TLS_GD64)
2713 {
2714 if (indx == 0)
2715 {
2716 BFD_ASSERT (! unresolved_reloc);
2717 bfd_put_64 (output_bfd,
2718 relocation - dtpoff_base (info),
2719 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2720 }
2721 else
2722 {
2723 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
2724 outrel.r_offset += GOT_ENTRY_SIZE;
2725 outrel.r_addend = 0;
2726 htab->srelgot->reloc_count++;
2727 loc += sizeof (Elf64_External_Rela);
2728 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2729 }
2730 }
2731
2732 if (h != NULL)
2733 h->got.offset |= 1;
2734 else
2735 local_got_offsets[r_symndx] |= 1;
2736 }
2737
2738 if (off >= (bfd_vma) -2)
2739 abort ();
2740 if (r_type == ELF64_R_TYPE (rel->r_info))
2741 {
2742 relocation = htab->sgot->output_offset + off;
2743 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
2744 relocation += htab->sgot->output_section->vma;
2745 unresolved_reloc = FALSE;
2746 }
2747 else
2748 {
2749 bfd_put_64 (output_bfd, htab->sgot->output_offset + off,
2750 contents + rel->r_offset);
2751 continue;
2752 }
2753 break;
2754
2755 case R_390_TLS_GOTIE12:
2756 case R_390_TLS_GOTIE20:
2757 case R_390_TLS_IEENT:
2758 if (h == NULL)
2759 {
2760 if (local_got_offsets == NULL)
2761 abort();
2762 off = local_got_offsets[r_symndx];
2763 if (info->shared)
2764 goto emit_tls_relocs;
2765 }
2766 else
2767 {
2768 off = h->got.offset;
2769 tls_type = elf_s390_hash_entry(h)->tls_type;
2770 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2771 goto emit_tls_relocs;
2772 }
2773
2774 if (htab->sgot == NULL)
2775 abort ();
2776
2777 BFD_ASSERT (! unresolved_reloc);
2778 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2779 htab->sgot->contents + off);
2780 relocation = htab->sgot->output_offset + off;
2781 if (r_type == R_390_TLS_IEENT)
2782 relocation += htab->sgot->output_section->vma;
2783 unresolved_reloc = FALSE;
2784 break;
2785
2786 case R_390_TLS_LDM64:
2787 if (! info->shared)
2788 /* The literal pool entry this relocation refers to gets ignored
2789 by the optimized code of the local exec model. Do nothing
2790 and the value will turn out zero. */
2791 continue;
2792
2793 if (htab->sgot == NULL)
2794 abort ();
2795
2796 off = htab->tls_ldm_got.offset;
2797 if (off & 1)
2798 off &= ~1;
2799 else
2800 {
2801 Elf_Internal_Rela outrel;
2802 bfd_byte *loc;
2803
2804 if (htab->srelgot == NULL)
2805 abort ();
2806
2807 outrel.r_offset = (htab->sgot->output_section->vma
2808 + htab->sgot->output_offset + off);
2809
2810 bfd_put_64 (output_bfd, 0,
2811 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2812 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
2813 outrel.r_addend = 0;
2814 loc = htab->srelgot->contents;
2815 loc += htab->srelgot->reloc_count++
2816 * sizeof (Elf64_External_Rela);
2817 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2818 htab->tls_ldm_got.offset |= 1;
2819 }
2820 relocation = htab->sgot->output_offset + off;
2821 unresolved_reloc = FALSE;
2822 break;
2823
2824 case R_390_TLS_LE64:
2825 if (info->shared)
2826 {
2827 /* Linking a shared library with non-fpic code requires
2828 a R_390_TLS_TPOFF relocation. */
2829 Elf_Internal_Rela outrel;
2830 asection *sreloc;
2831 bfd_byte *loc;
2832 int indx;
2833
2834 outrel.r_offset = rel->r_offset
2835 + input_section->output_section->vma
2836 + input_section->output_offset;
2837 if (h != NULL && h->dynindx != -1)
2838 indx = h->dynindx;
2839 else
2840 indx = 0;
2841 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
2842 if (indx == 0)
2843 outrel.r_addend = relocation - dtpoff_base (info);
2844 else
2845 outrel.r_addend = 0;
2846 sreloc = elf_section_data (input_section)->sreloc;
2847 if (sreloc == NULL)
2848 abort ();
2849 loc = sreloc->contents;
2850 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2851 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2852 }
2853 else
2854 {
2855 BFD_ASSERT (! unresolved_reloc);
2856 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2857 contents + rel->r_offset);
2858 }
2859 continue;
2860
2861 case R_390_TLS_LDO64:
2862 if (info->shared)
2863 relocation -= dtpoff_base (info);
2864 else
2865 /* When converting LDO to LE, we must negate. */
2866 relocation = -tpoff (info, relocation);
2867 break;
2868
2869 /* Relocations for tls instructions. */
2870 case R_390_TLS_LOAD:
2871 case R_390_TLS_GDCALL:
2872 case R_390_TLS_LDCALL:
2873 tls_type = GOT_UNKNOWN;
2874 if (h == NULL && local_got_offsets)
2875 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2876 else if (h != NULL)
2877 tls_type = elf_s390_hash_entry(h)->tls_type;
2878
2879 if (tls_type == GOT_TLS_GD)
2880 continue;
2881
2882 if (r_type == R_390_TLS_LOAD)
2883 {
2884 if (!info->shared && (h == NULL || h->dynindx == -1))
2885 {
2886 /* IE->LE transition. Four valid cases:
2887 lg %rx,(0,%ry) -> sllg %rx,%ry,0
2888 lg %rx,(%ry,0) -> sllg %rx,%ry,0
2889 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
2890 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
2891 unsigned int insn0, insn1, ry;
2892
2893 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2894 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2895 if (insn1 != 0x0004)
2896 invalid_tls_insn (input_bfd, input_section, rel);
2897 ry = 0;
2898 if ((insn0 & 0xff00f000) == 0xe3000000)
2899 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
2900 ry = (insn0 & 0x000f0000);
2901 else if ((insn0 & 0xff0f0000) == 0xe3000000)
2902 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
2903 ry = (insn0 & 0x0000f000) << 4;
2904 else if ((insn0 & 0xff00f000) == 0xe300c000)
2905 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
2906 ry = (insn0 & 0x000f0000);
2907 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
2908 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
2909 ry = (insn0 & 0x0000f000) << 4;
2910 else
2911 invalid_tls_insn (input_bfd, input_section, rel);
2912 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
2913 insn1 = 0x000d;
2914 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2915 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2916 }
2917 }
2918 else if (r_type == R_390_TLS_GDCALL)
2919 {
2920 unsigned int insn0, insn1;
2921
2922 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2923 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2924 if ((insn0 & 0xffff0000) != 0xc0e50000)
2925 invalid_tls_insn (input_bfd, input_section, rel);
2926 if (!info->shared && (h == NULL || h->dynindx == -1))
2927 {
2928 /* GD->LE transition.
2929 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2930 insn0 = 0xc0040000;
2931 insn1 = 0x0000;
2932 }
2933 else
2934 {
2935 /* GD->IE transition.
2936 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
2937 insn0 = 0xe322c000;
2938 insn1 = 0x0004;
2939 }
2940 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2941 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2942 }
2943 else if (r_type == R_390_TLS_LDCALL)
2944 {
2945 if (!info->shared)
2946 {
2947 unsigned int insn0, insn1;
2948
2949 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2950 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2951 if ((insn0 & 0xffff0000) != 0xc0e50000)
2952 invalid_tls_insn (input_bfd, input_section, rel);
2953 /* LD->LE transition.
2954 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2955 insn0 = 0xc0040000;
2956 insn1 = 0x0000;
2957 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2958 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2959 }
2960 }
2961 continue;
2962
2963 default:
2964 break;
2965 }
2966
2967 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2968 because such sections are not SEC_ALLOC and thus ld.so will
2969 not process them. */
2970 if (unresolved_reloc
2971 && !((input_section->flags & SEC_DEBUGGING) != 0
2972 && h->def_dynamic))
2973 (*_bfd_error_handler)
2974 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
2975 input_bfd,
2976 input_section,
2977 (long) rel->r_offset,
2978 howto->name,
2979 h->root.root.string);
2980
2981 if (r_type == R_390_20
2982 || r_type == R_390_GOT20
2983 || r_type == R_390_GOTPLT20
2984 || r_type == R_390_TLS_GOTIE20)
2985 {
2986 relocation += rel->r_addend;
2987 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
2988 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
2989 contents, rel->r_offset,
2990 relocation, 0);
2991 }
2992 else
2993 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
2994 contents, rel->r_offset,
2995 relocation, rel->r_addend);
2996
2997 if (r != bfd_reloc_ok)
2998 {
2999 const char *name;
3000
3001 if (h != NULL)
3002 name = h->root.root.string;
3003 else
3004 {
3005 name = bfd_elf_string_from_elf_section (input_bfd,
3006 symtab_hdr->sh_link,
3007 sym->st_name);
3008 if (name == NULL)
3009 return FALSE;
3010 if (*name == '\0')
3011 name = bfd_section_name (input_bfd, sec);
3012 }
3013
3014 if (r == bfd_reloc_overflow)
3015 {
3016
3017 if (! ((*info->callbacks->reloc_overflow)
3018 (info, (h ? &h->root : NULL), name, howto->name,
3019 (bfd_vma) 0, input_bfd, input_section,
3020 rel->r_offset)))
3021 return FALSE;
3022 }
3023 else
3024 {
3025 (*_bfd_error_handler)
3026 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3027 input_bfd, input_section,
3028 (long) rel->r_offset, name, (int) r);
3029 return FALSE;
3030 }
3031 }
3032 }
3033
3034 return TRUE;
3035 }
3036
3037 /* Finish up dynamic symbol handling. We set the contents of various
3038 dynamic sections here. */
3039
3040 static bfd_boolean
3041 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3042 bfd *output_bfd;
3043 struct bfd_link_info *info;
3044 struct elf_link_hash_entry *h;
3045 Elf_Internal_Sym *sym;
3046 {
3047 struct elf_s390_link_hash_table *htab;
3048
3049 htab = elf_s390_hash_table (info);
3050
3051 if (h->plt.offset != (bfd_vma) -1)
3052 {
3053 bfd_vma plt_index;
3054 bfd_vma got_offset;
3055 Elf_Internal_Rela rela;
3056 bfd_byte *loc;
3057
3058 /* This symbol has an entry in the procedure linkage table. Set
3059 it up. */
3060
3061 if (h->dynindx == -1
3062 || htab->splt == NULL
3063 || htab->sgotplt == NULL
3064 || htab->srelplt == NULL)
3065 abort ();
3066
3067 /* Calc. index no.
3068 Current offset - size first entry / entry size. */
3069 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3070
3071 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
3072 addr & GOT addr. */
3073 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3074
3075 /* Fill in the blueprint of a PLT. */
3076 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3077 htab->splt->contents + h->plt.offset);
3078 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3079 htab->splt->contents + h->plt.offset + 4);
3080 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3081 htab->splt->contents + h->plt.offset + 8);
3082 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3083 htab->splt->contents + h->plt.offset + 12);
3084 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3085 htab->splt->contents + h->plt.offset + 16);
3086 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5,
3087 htab->splt->contents + h->plt.offset + 20);
3088 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6,
3089 htab->splt->contents + h->plt.offset + 24);
3090 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7,
3091 htab->splt->contents + h->plt.offset + 28);
3092 /* Fixup the relative address to the GOT entry */
3093 bfd_put_32 (output_bfd,
3094 (htab->sgotplt->output_section->vma +
3095 htab->sgotplt->output_offset + got_offset
3096 - (htab->splt->output_section->vma + h->plt.offset))/2,
3097 htab->splt->contents + h->plt.offset + 2);
3098 /* Fixup the relative branch to PLT 0 */
3099 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3100 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3101 htab->splt->contents + h->plt.offset + 24);
3102 /* Fixup offset into symbol table */
3103 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3104 htab->splt->contents + h->plt.offset + 28);
3105
3106 /* Fill in the entry in the global offset table.
3107 Points to instruction after GOT offset. */
3108 bfd_put_64 (output_bfd,
3109 (htab->splt->output_section->vma
3110 + htab->splt->output_offset
3111 + h->plt.offset
3112 + 14),
3113 htab->sgotplt->contents + got_offset);
3114
3115 /* Fill in the entry in the .rela.plt section. */
3116 rela.r_offset = (htab->sgotplt->output_section->vma
3117 + htab->sgotplt->output_offset
3118 + got_offset);
3119 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3120 rela.r_addend = 0;
3121 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela);
3122 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3123
3124 if (!h->def_regular)
3125 {
3126 /* Mark the symbol as undefined, rather than as defined in
3127 the .plt section. Leave the value alone. This is a clue
3128 for the dynamic linker, to make function pointer
3129 comparisons work between an application and shared
3130 library. */
3131 sym->st_shndx = SHN_UNDEF;
3132 }
3133 }
3134
3135 if (h->got.offset != (bfd_vma) -1
3136 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3137 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3138 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3139 {
3140 Elf_Internal_Rela rela;
3141 bfd_byte *loc;
3142
3143 /* This symbol has an entry in the global offset table. Set it
3144 up. */
3145 if (htab->sgot == NULL || htab->srelgot == NULL)
3146 abort ();
3147
3148 rela.r_offset = (htab->sgot->output_section->vma
3149 + htab->sgot->output_offset
3150 + (h->got.offset &~ (bfd_vma) 1));
3151
3152 /* If this is a static link, or it is a -Bsymbolic link and the
3153 symbol is defined locally or was forced to be local because
3154 of a version file, we just want to emit a RELATIVE reloc.
3155 The entry in the global offset table will already have been
3156 initialized in the relocate_section function. */
3157 if (info->shared
3158 && SYMBOL_REFERENCES_LOCAL (info, h))
3159 {
3160 if (!h->def_regular)
3161 return FALSE;
3162 BFD_ASSERT((h->got.offset & 1) != 0);
3163 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3164 rela.r_addend = (h->root.u.def.value
3165 + h->root.u.def.section->output_section->vma
3166 + h->root.u.def.section->output_offset);
3167 }
3168 else
3169 {
3170 BFD_ASSERT((h->got.offset & 1) == 0);
3171 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3172 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3173 rela.r_addend = 0;
3174 }
3175
3176 loc = htab->srelgot->contents;
3177 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3178 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3179 }
3180
3181 if (h->needs_copy)
3182 {
3183 Elf_Internal_Rela rela;
3184 bfd_byte *loc;
3185
3186 /* This symbols needs a copy reloc. Set it up. */
3187
3188 if (h->dynindx == -1
3189 || (h->root.type != bfd_link_hash_defined
3190 && h->root.type != bfd_link_hash_defweak)
3191 || htab->srelbss == NULL)
3192 abort ();
3193
3194 rela.r_offset = (h->root.u.def.value
3195 + h->root.u.def.section->output_section->vma
3196 + h->root.u.def.section->output_offset);
3197 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3198 rela.r_addend = 0;
3199 loc = htab->srelbss->contents;
3200 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3201 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3202 }
3203
3204 /* Mark some specially defined symbols as absolute. */
3205 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3206 || h == htab->elf.hgot
3207 || h == htab->elf.hplt)
3208 sym->st_shndx = SHN_ABS;
3209
3210 return TRUE;
3211 }
3212
3213 /* Used to decide how to sort relocs in an optimal manner for the
3214 dynamic linker, before writing them out. */
3215
3216 static enum elf_reloc_type_class
3217 elf_s390_reloc_type_class (rela)
3218 const Elf_Internal_Rela *rela;
3219 {
3220 switch ((int) ELF64_R_TYPE (rela->r_info))
3221 {
3222 case R_390_RELATIVE:
3223 return reloc_class_relative;
3224 case R_390_JMP_SLOT:
3225 return reloc_class_plt;
3226 case R_390_COPY:
3227 return reloc_class_copy;
3228 default:
3229 return reloc_class_normal;
3230 }
3231 }
3232
3233 /* Finish up the dynamic sections. */
3234
3235 static bfd_boolean
3236 elf_s390_finish_dynamic_sections (output_bfd, info)
3237 bfd *output_bfd;
3238 struct bfd_link_info *info;
3239 {
3240 struct elf_s390_link_hash_table *htab;
3241 bfd *dynobj;
3242 asection *sdyn;
3243
3244 htab = elf_s390_hash_table (info);
3245 dynobj = htab->elf.dynobj;
3246 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3247
3248 if (htab->elf.dynamic_sections_created)
3249 {
3250 Elf64_External_Dyn *dyncon, *dynconend;
3251
3252 if (sdyn == NULL || htab->sgot == NULL)
3253 abort ();
3254
3255 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3256 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3257 for (; dyncon < dynconend; dyncon++)
3258 {
3259 Elf_Internal_Dyn dyn;
3260 asection *s;
3261
3262 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3263
3264 switch (dyn.d_tag)
3265 {
3266 default:
3267 continue;
3268
3269 case DT_PLTGOT:
3270 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3271 break;
3272
3273 case DT_JMPREL:
3274 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3275 break;
3276
3277 case DT_PLTRELSZ:
3278 s = htab->srelplt->output_section;
3279 dyn.d_un.d_val = s->size;
3280 break;
3281
3282 case DT_RELASZ:
3283 /* The procedure linkage table relocs (DT_JMPREL) should
3284 not be included in the overall relocs (DT_RELA).
3285 Therefore, we override the DT_RELASZ entry here to
3286 make it not include the JMPREL relocs. Since the
3287 linker script arranges for .rela.plt to follow all
3288 other relocation sections, we don't have to worry
3289 about changing the DT_RELA entry. */
3290 s = htab->srelplt->output_section;
3291 dyn.d_un.d_val -= s->size;
3292 break;
3293 }
3294
3295 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3296 }
3297
3298 /* Fill in the special first entry in the procedure linkage table. */
3299 if (htab->splt && htab->splt->size > 0)
3300 {
3301 /* fill in blueprint for plt 0 entry */
3302 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0,
3303 htab->splt->contents );
3304 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3305 htab->splt->contents +4 );
3306 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3307 htab->splt->contents +12 );
3308 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3309 htab->splt->contents +16 );
3310 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3311 htab->splt->contents +20 );
3312 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6,
3313 htab->splt->contents + 24);
3314 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7,
3315 htab->splt->contents + 28 );
3316 /* Fixup relative address to start of GOT */
3317 bfd_put_32 (output_bfd,
3318 (htab->sgotplt->output_section->vma +
3319 htab->sgotplt->output_offset
3320 - htab->splt->output_section->vma - 6)/2,
3321 htab->splt->contents + 8);
3322 }
3323 elf_section_data (htab->splt->output_section)
3324 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE;
3325 }
3326
3327 if (htab->sgotplt)
3328 {
3329 /* Fill in the first three entries in the global offset table. */
3330 if (htab->sgotplt->size > 0)
3331 {
3332 bfd_put_64 (output_bfd,
3333 (sdyn == NULL ? (bfd_vma) 0
3334 : sdyn->output_section->vma + sdyn->output_offset),
3335 htab->sgotplt->contents);
3336 /* One entry for shared object struct ptr. */
3337 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3338 /* One entry for _dl_runtime_resolve. */
3339 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12);
3340 }
3341
3342 elf_section_data (htab->sgot->output_section)
3343 ->this_hdr.sh_entsize = 8;
3344 }
3345 return TRUE;
3346 }
3347
3348 /* Return address for Ith PLT stub in section PLT, for relocation REL
3349 or (bfd_vma) -1 if it should not be included. */
3350
3351 static bfd_vma
3352 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3353 const arelent *rel ATTRIBUTE_UNUSED)
3354 {
3355 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3356 }
3357
3358
3359 /* Why was the hash table entry size definition changed from
3360 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3361 this is the only reason for the s390_elf64_size_info structure. */
3362
3363 const struct elf_size_info s390_elf64_size_info =
3364 {
3365 sizeof (Elf64_External_Ehdr),
3366 sizeof (Elf64_External_Phdr),
3367 sizeof (Elf64_External_Shdr),
3368 sizeof (Elf64_External_Rel),
3369 sizeof (Elf64_External_Rela),
3370 sizeof (Elf64_External_Sym),
3371 sizeof (Elf64_External_Dyn),
3372 sizeof (Elf_External_Note),
3373 8, /* hash-table entry size. */
3374 1, /* internal relocations per external relocations. */
3375 64, /* arch_size. */
3376 3, /* log_file_align. */
3377 ELFCLASS64, EV_CURRENT,
3378 bfd_elf64_write_out_phdrs,
3379 bfd_elf64_write_shdrs_and_ehdr,
3380 bfd_elf64_checksum_contents,
3381 bfd_elf64_write_relocs,
3382 bfd_elf64_swap_symbol_in,
3383 bfd_elf64_swap_symbol_out,
3384 bfd_elf64_slurp_reloc_table,
3385 bfd_elf64_slurp_symbol_table,
3386 bfd_elf64_swap_dyn_in,
3387 bfd_elf64_swap_dyn_out,
3388 bfd_elf64_swap_reloc_in,
3389 bfd_elf64_swap_reloc_out,
3390 bfd_elf64_swap_reloca_in,
3391 bfd_elf64_swap_reloca_out
3392 };
3393
3394 #define TARGET_BIG_SYM bfd_elf64_s390_vec
3395 #define TARGET_BIG_NAME "elf64-s390"
3396 #define ELF_ARCH bfd_arch_s390
3397 #define ELF_MACHINE_CODE EM_S390
3398 #define ELF_MACHINE_ALT1 EM_S390_OLD
3399 #define ELF_MAXPAGESIZE 0x1000
3400
3401 #define elf_backend_size_info s390_elf64_size_info
3402
3403 #define elf_backend_can_gc_sections 1
3404 #define elf_backend_can_refcount 1
3405 #define elf_backend_want_got_plt 1
3406 #define elf_backend_plt_readonly 1
3407 #define elf_backend_want_plt_sym 0
3408 #define elf_backend_got_header_size 24
3409 #define elf_backend_rela_normal 1
3410
3411 #define elf_info_to_howto elf_s390_info_to_howto
3412
3413 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3414 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3415 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3416 #define bfd_elf64_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
3417
3418 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3419 #define elf_backend_check_relocs elf_s390_check_relocs
3420 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3421 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3422 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3423 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3424 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3425 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3426 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3427 #define elf_backend_relocate_section elf_s390_relocate_section
3428 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3429 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3430 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3431 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3432
3433 #define bfd_elf64_mkobject elf_s390_mkobject
3434 #define elf_backend_object_p elf_s390_object_p
3435
3436 #include "elf64-target.h"
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