1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
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 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23 #include "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 *
elf_s390_reloc_type_lookup(abfd,code)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 *
elf_s390_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)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
elf_s390_info_to_howto(abfd,cache_ptr,dst)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
s390_tls_reloc(abfd,reloc_entry,symbol,data,input_section,output_bfd,error_message)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
s390_elf_ldisp_reloc(abfd,reloc_entry,symbol,data,input_section,output_bfd,error_message)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
elf_s390_is_local_label_name(abfd,name)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 struct elf_s390_obj_tdata
633 {
634 struct elf_obj_tdata root;
635
636 /* tls_type for each local got entry. */
637 char *local_got_tls_type;
638 };
639
640 #define elf_s390_tdata(abfd) \
641 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
642
643 #define elf_s390_local_got_tls_type(abfd) \
644 (elf_s390_tdata (abfd)->local_got_tls_type)
645
646 static bfd_boolean
elf_s390_mkobject(bfd * abfd)647 elf_s390_mkobject (bfd *abfd)
648 {
649 if (abfd->tdata.any == NULL)
650 {
651 bfd_size_type amt = sizeof (struct elf_s390_obj_tdata);
652 abfd->tdata.any = bfd_zalloc (abfd, amt);
653 if (abfd->tdata.any == NULL)
654 return FALSE;
655 }
656 return bfd_elf_mkobject (abfd);
657 }
658
659 static bfd_boolean
elf_s390_object_p(abfd)660 elf_s390_object_p (abfd)
661 bfd *abfd;
662 {
663 /* Set the right machine number for an s390 elf32 file. */
664 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
665 }
666
667 /* s390 ELF linker hash table. */
668
669 struct elf_s390_link_hash_table
670 {
671 struct elf_link_hash_table elf;
672
673 /* Short-cuts to get to dynamic linker sections. */
674 asection *sgot;
675 asection *sgotplt;
676 asection *srelgot;
677 asection *splt;
678 asection *srelplt;
679 asection *sdynbss;
680 asection *srelbss;
681
682 union {
683 bfd_signed_vma refcount;
684 bfd_vma offset;
685 } tls_ldm_got;
686
687 /* Small local sym to section mapping cache. */
688 struct sym_sec_cache sym_sec;
689 };
690
691 /* Get the s390 ELF linker hash table from a link_info structure. */
692
693 #define elf_s390_hash_table(p) \
694 ((struct elf_s390_link_hash_table *) ((p)->hash))
695
696 /* Create an entry in an s390 ELF linker hash table. */
697
698 static struct bfd_hash_entry *
link_hash_newfunc(entry,table,string)699 link_hash_newfunc (entry, table, string)
700 struct bfd_hash_entry *entry;
701 struct bfd_hash_table *table;
702 const char *string;
703 {
704 /* Allocate the structure if it has not already been allocated by a
705 subclass. */
706 if (entry == NULL)
707 {
708 entry = bfd_hash_allocate (table,
709 sizeof (struct elf_s390_link_hash_entry));
710 if (entry == NULL)
711 return entry;
712 }
713
714 /* Call the allocation method of the superclass. */
715 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
716 if (entry != NULL)
717 {
718 struct elf_s390_link_hash_entry *eh;
719
720 eh = (struct elf_s390_link_hash_entry *) entry;
721 eh->dyn_relocs = NULL;
722 eh->gotplt_refcount = 0;
723 eh->tls_type = GOT_UNKNOWN;
724 }
725
726 return entry;
727 }
728
729 /* Create an s390 ELF linker hash table. */
730
731 static struct bfd_link_hash_table *
elf_s390_link_hash_table_create(abfd)732 elf_s390_link_hash_table_create (abfd)
733 bfd *abfd;
734 {
735 struct elf_s390_link_hash_table *ret;
736 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
737
738 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
739 if (ret == NULL)
740 return NULL;
741
742 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
743 sizeof (struct elf_s390_link_hash_entry)))
744 {
745 free (ret);
746 return NULL;
747 }
748
749 ret->sgot = NULL;
750 ret->sgotplt = NULL;
751 ret->srelgot = NULL;
752 ret->splt = NULL;
753 ret->srelplt = NULL;
754 ret->sdynbss = NULL;
755 ret->srelbss = NULL;
756 ret->tls_ldm_got.refcount = 0;
757 ret->sym_sec.abfd = NULL;
758
759 return &ret->elf.root;
760 }
761
762 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
763 shortcuts to them in our hash table. */
764
765 static bfd_boolean
create_got_section(dynobj,info)766 create_got_section (dynobj, info)
767 bfd *dynobj;
768 struct bfd_link_info *info;
769 {
770 struct elf_s390_link_hash_table *htab;
771
772 if (! _bfd_elf_create_got_section (dynobj, info))
773 return FALSE;
774
775 htab = elf_s390_hash_table (info);
776 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
777 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
778 if (!htab->sgot || !htab->sgotplt)
779 abort ();
780
781 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got",
782 (SEC_ALLOC | SEC_LOAD
783 | SEC_HAS_CONTENTS
784 | SEC_IN_MEMORY
785 | SEC_LINKER_CREATED
786 | SEC_READONLY));
787 if (htab->srelgot == NULL
788 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3))
789 return FALSE;
790 return TRUE;
791 }
792
793 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
794 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
795 hash table. */
796
797 static bfd_boolean
elf_s390_create_dynamic_sections(dynobj,info)798 elf_s390_create_dynamic_sections (dynobj, info)
799 bfd *dynobj;
800 struct bfd_link_info *info;
801 {
802 struct elf_s390_link_hash_table *htab;
803
804 htab = elf_s390_hash_table (info);
805 if (!htab->sgot && !create_got_section (dynobj, info))
806 return FALSE;
807
808 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
809 return FALSE;
810
811 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
812 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
813 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
814 if (!info->shared)
815 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
816
817 if (!htab->splt || !htab->srelplt || !htab->sdynbss
818 || (!info->shared && !htab->srelbss))
819 abort ();
820
821 return TRUE;
822 }
823
824 /* Copy the extra info we tack onto an elf_link_hash_entry. */
825
826 static void
elf_s390_copy_indirect_symbol(info,dir,ind)827 elf_s390_copy_indirect_symbol (info, dir, ind)
828 struct bfd_link_info *info;
829 struct elf_link_hash_entry *dir, *ind;
830 {
831 struct elf_s390_link_hash_entry *edir, *eind;
832
833 edir = (struct elf_s390_link_hash_entry *) dir;
834 eind = (struct elf_s390_link_hash_entry *) ind;
835
836 if (eind->dyn_relocs != NULL)
837 {
838 if (edir->dyn_relocs != NULL)
839 {
840 struct elf_s390_dyn_relocs **pp;
841 struct elf_s390_dyn_relocs *p;
842
843 /* Add reloc counts against the indirect sym to the direct sym
844 list. Merge any entries against the same section. */
845 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
846 {
847 struct elf_s390_dyn_relocs *q;
848
849 for (q = edir->dyn_relocs; q != NULL; q = q->next)
850 if (q->sec == p->sec)
851 {
852 q->pc_count += p->pc_count;
853 q->count += p->count;
854 *pp = p->next;
855 break;
856 }
857 if (q == NULL)
858 pp = &p->next;
859 }
860 *pp = edir->dyn_relocs;
861 }
862
863 edir->dyn_relocs = eind->dyn_relocs;
864 eind->dyn_relocs = NULL;
865 }
866
867 if (ind->root.type == bfd_link_hash_indirect
868 && dir->got.refcount <= 0)
869 {
870 edir->tls_type = eind->tls_type;
871 eind->tls_type = GOT_UNKNOWN;
872 }
873
874 if (ELIMINATE_COPY_RELOCS
875 && ind->root.type != bfd_link_hash_indirect
876 && dir->dynamic_adjusted)
877 {
878 /* If called to transfer flags for a weakdef during processing
879 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
880 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
881 dir->ref_dynamic |= ind->ref_dynamic;
882 dir->ref_regular |= ind->ref_regular;
883 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
884 dir->needs_plt |= ind->needs_plt;
885 }
886 else
887 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
888 }
889
890 static int
elf_s390_tls_transition(info,r_type,is_local)891 elf_s390_tls_transition (info, r_type, is_local)
892 struct bfd_link_info *info;
893 int r_type;
894 int is_local;
895 {
896 if (info->shared)
897 return r_type;
898
899 switch (r_type)
900 {
901 case R_390_TLS_GD64:
902 case R_390_TLS_IE64:
903 if (is_local)
904 return R_390_TLS_LE64;
905 return R_390_TLS_IE64;
906 case R_390_TLS_GOTIE64:
907 if (is_local)
908 return R_390_TLS_LE64;
909 return R_390_TLS_GOTIE64;
910 case R_390_TLS_LDM64:
911 return R_390_TLS_LE64;
912 }
913
914 return r_type;
915 }
916
917 /* Look through the relocs for a section during the first phase, and
918 allocate space in the global offset table or procedure linkage
919 table. */
920
921 static bfd_boolean
elf_s390_check_relocs(abfd,info,sec,relocs)922 elf_s390_check_relocs (abfd, info, sec, relocs)
923 bfd *abfd;
924 struct bfd_link_info *info;
925 asection *sec;
926 const Elf_Internal_Rela *relocs;
927 {
928 struct elf_s390_link_hash_table *htab;
929 Elf_Internal_Shdr *symtab_hdr;
930 struct elf_link_hash_entry **sym_hashes;
931 const Elf_Internal_Rela *rel;
932 const Elf_Internal_Rela *rel_end;
933 asection *sreloc;
934 bfd_signed_vma *local_got_refcounts;
935 int tls_type, old_tls_type;
936
937 if (info->relocatable)
938 return TRUE;
939
940 htab = elf_s390_hash_table (info);
941 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
942 sym_hashes = elf_sym_hashes (abfd);
943 local_got_refcounts = elf_local_got_refcounts (abfd);
944
945 sreloc = NULL;
946
947 rel_end = relocs + sec->reloc_count;
948 for (rel = relocs; rel < rel_end; rel++)
949 {
950 unsigned int r_type;
951 unsigned long r_symndx;
952 struct elf_link_hash_entry *h;
953
954 r_symndx = ELF64_R_SYM (rel->r_info);
955
956 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
957 {
958 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
959 abfd,
960 r_symndx);
961 return FALSE;
962 }
963
964 if (r_symndx < symtab_hdr->sh_info)
965 h = NULL;
966 else
967 {
968 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
969 while (h->root.type == bfd_link_hash_indirect
970 || h->root.type == bfd_link_hash_warning)
971 h = (struct elf_link_hash_entry *) h->root.u.i.link;
972 }
973
974 /* Create got section and local_got_refcounts array if they
975 are needed. */
976 r_type = elf_s390_tls_transition (info,
977 ELF64_R_TYPE (rel->r_info),
978 h == NULL);
979 switch (r_type)
980 {
981 case R_390_GOT12:
982 case R_390_GOT16:
983 case R_390_GOT20:
984 case R_390_GOT32:
985 case R_390_GOT64:
986 case R_390_GOTENT:
987 case R_390_GOTPLT12:
988 case R_390_GOTPLT16:
989 case R_390_GOTPLT20:
990 case R_390_GOTPLT32:
991 case R_390_GOTPLT64:
992 case R_390_GOTPLTENT:
993 case R_390_TLS_GD64:
994 case R_390_TLS_GOTIE12:
995 case R_390_TLS_GOTIE20:
996 case R_390_TLS_GOTIE64:
997 case R_390_TLS_IEENT:
998 case R_390_TLS_IE64:
999 case R_390_TLS_LDM64:
1000 if (h == NULL
1001 && local_got_refcounts == NULL)
1002 {
1003 bfd_size_type size;
1004
1005 size = symtab_hdr->sh_info;
1006 size *= (sizeof (bfd_signed_vma) + sizeof(char));
1007 local_got_refcounts = ((bfd_signed_vma *)
1008 bfd_zalloc (abfd, size));
1009 if (local_got_refcounts == NULL)
1010 return FALSE;
1011 elf_local_got_refcounts (abfd) = local_got_refcounts;
1012 elf_s390_local_got_tls_type (abfd)
1013 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1014 }
1015 /* Fall through. */
1016 case R_390_GOTOFF16:
1017 case R_390_GOTOFF32:
1018 case R_390_GOTOFF64:
1019 case R_390_GOTPC:
1020 case R_390_GOTPCDBL:
1021 if (htab->sgot == NULL)
1022 {
1023 if (htab->elf.dynobj == NULL)
1024 htab->elf.dynobj = abfd;
1025 if (!create_got_section (htab->elf.dynobj, info))
1026 return FALSE;
1027 }
1028 }
1029
1030 switch (r_type)
1031 {
1032 case R_390_GOTOFF16:
1033 case R_390_GOTOFF32:
1034 case R_390_GOTOFF64:
1035 case R_390_GOTPC:
1036 case R_390_GOTPCDBL:
1037 /* Got is created, nothing to be done. */
1038 break;
1039
1040 case R_390_PLT16DBL:
1041 case R_390_PLT32:
1042 case R_390_PLT32DBL:
1043 case R_390_PLT64:
1044 case R_390_PLTOFF16:
1045 case R_390_PLTOFF32:
1046 case R_390_PLTOFF64:
1047 /* This symbol requires a procedure linkage table entry. We
1048 actually build the entry in adjust_dynamic_symbol,
1049 because this might be a case of linking PIC code which is
1050 never referenced by a dynamic object, in which case we
1051 don't need to generate a procedure linkage table entry
1052 after all. */
1053
1054 /* If this is a local symbol, we resolve it directly without
1055 creating a procedure linkage table entry. */
1056 if (h != NULL)
1057 {
1058 h->needs_plt = 1;
1059 h->plt.refcount += 1;
1060 }
1061 break;
1062
1063 case R_390_GOTPLT12:
1064 case R_390_GOTPLT16:
1065 case R_390_GOTPLT20:
1066 case R_390_GOTPLT32:
1067 case R_390_GOTPLT64:
1068 case R_390_GOTPLTENT:
1069 /* This symbol requires either a procedure linkage table entry
1070 or an entry in the local got. We actually build the entry
1071 in adjust_dynamic_symbol because whether this is really a
1072 global reference can change and with it the fact if we have
1073 to create a plt entry or a local got entry. To be able to
1074 make a once global symbol a local one we have to keep track
1075 of the number of gotplt references that exist for this
1076 symbol. */
1077 if (h != NULL)
1078 {
1079 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1080 h->needs_plt = 1;
1081 h->plt.refcount += 1;
1082 }
1083 else
1084 local_got_refcounts[r_symndx] += 1;
1085 break;
1086
1087 case R_390_TLS_LDM64:
1088 htab->tls_ldm_got.refcount += 1;
1089 break;
1090
1091 case R_390_TLS_IE64:
1092 case R_390_TLS_GOTIE12:
1093 case R_390_TLS_GOTIE20:
1094 case R_390_TLS_GOTIE64:
1095 case R_390_TLS_IEENT:
1096 if (info->shared)
1097 info->flags |= DF_STATIC_TLS;
1098 /* Fall through */
1099
1100 case R_390_GOT12:
1101 case R_390_GOT16:
1102 case R_390_GOT20:
1103 case R_390_GOT32:
1104 case R_390_GOT64:
1105 case R_390_GOTENT:
1106 case R_390_TLS_GD64:
1107 /* This symbol requires a global offset table entry. */
1108 switch (r_type)
1109 {
1110 default:
1111 case R_390_GOT12:
1112 case R_390_GOT16:
1113 case R_390_GOT20:
1114 case R_390_GOT32:
1115 case R_390_GOTENT:
1116 tls_type = GOT_NORMAL;
1117 break;
1118 case R_390_TLS_GD64:
1119 tls_type = GOT_TLS_GD;
1120 break;
1121 case R_390_TLS_IE64:
1122 case R_390_TLS_GOTIE64:
1123 tls_type = GOT_TLS_IE;
1124 break;
1125 case R_390_TLS_GOTIE12:
1126 case R_390_TLS_GOTIE20:
1127 case R_390_TLS_IEENT:
1128 tls_type = GOT_TLS_IE_NLT;
1129 break;
1130 }
1131
1132 if (h != NULL)
1133 {
1134 h->got.refcount += 1;
1135 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1136 }
1137 else
1138 {
1139 local_got_refcounts[r_symndx] += 1;
1140 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1141 }
1142 /* If a TLS symbol is accessed using IE at least once,
1143 there is no point to use dynamic model for it. */
1144 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1145 {
1146 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1147 {
1148 (*_bfd_error_handler)
1149 (_("%B: `%s' accessed both as normal and thread local symbol"),
1150 abfd, h->root.root.string);
1151 return FALSE;
1152 }
1153 if (old_tls_type > tls_type)
1154 tls_type = old_tls_type;
1155 }
1156
1157 if (old_tls_type != tls_type)
1158 {
1159 if (h != NULL)
1160 elf_s390_hash_entry (h)->tls_type = tls_type;
1161 else
1162 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1163 }
1164
1165 if (r_type != R_390_TLS_IE64)
1166 break;
1167 /* Fall through */
1168
1169 case R_390_TLS_LE64:
1170 if (!info->shared)
1171 break;
1172 info->flags |= DF_STATIC_TLS;
1173 /* Fall through */
1174
1175 case R_390_8:
1176 case R_390_16:
1177 case R_390_32:
1178 case R_390_64:
1179 case R_390_PC16:
1180 case R_390_PC16DBL:
1181 case R_390_PC32:
1182 case R_390_PC32DBL:
1183 case R_390_PC64:
1184 if (h != NULL && !info->shared)
1185 {
1186 /* If this reloc is in a read-only section, we might
1187 need a copy reloc. We can't check reliably at this
1188 stage whether the section is read-only, as input
1189 sections have not yet been mapped to output sections.
1190 Tentatively set the flag for now, and correct in
1191 adjust_dynamic_symbol. */
1192 h->non_got_ref = 1;
1193
1194 /* We may need a .plt entry if the function this reloc
1195 refers to is in a shared lib. */
1196 h->plt.refcount += 1;
1197 }
1198
1199 /* If we are creating a shared library, and this is a reloc
1200 against a global symbol, or a non PC relative reloc
1201 against a local symbol, then we need to copy the reloc
1202 into the shared library. However, if we are linking with
1203 -Bsymbolic, we do not need to copy a reloc against a
1204 global symbol which is defined in an object we are
1205 including in the link (i.e., DEF_REGULAR is set). At
1206 this point we have not seen all the input files, so it is
1207 possible that DEF_REGULAR is not set now but will be set
1208 later (it is never cleared). In case of a weak definition,
1209 DEF_REGULAR may be cleared later by a strong definition in
1210 a shared library. We account for that possibility below by
1211 storing information in the relocs_copied field of the hash
1212 table entry. A similar situation occurs when creating
1213 shared libraries and symbol visibility changes render the
1214 symbol local.
1215
1216 If on the other hand, we are creating an executable, we
1217 may need to keep relocations for symbols satisfied by a
1218 dynamic library if we manage to avoid copy relocs for the
1219 symbol. */
1220 if ((info->shared
1221 && (sec->flags & SEC_ALLOC) != 0
1222 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
1223 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
1224 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
1225 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
1226 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
1227 || (h != NULL
1228 && (! info->symbolic
1229 || h->root.type == bfd_link_hash_defweak
1230 || !h->def_regular))))
1231 || (ELIMINATE_COPY_RELOCS
1232 && !info->shared
1233 && (sec->flags & SEC_ALLOC) != 0
1234 && h != NULL
1235 && (h->root.type == bfd_link_hash_defweak
1236 || !h->def_regular)))
1237 {
1238 struct elf_s390_dyn_relocs *p;
1239 struct elf_s390_dyn_relocs **head;
1240
1241 /* We must copy these reloc types into the output file.
1242 Create a reloc section in dynobj and make room for
1243 this reloc. */
1244 if (sreloc == NULL)
1245 {
1246 const char *name;
1247 bfd *dynobj;
1248
1249 name = (bfd_elf_string_from_elf_section
1250 (abfd,
1251 elf_elfheader (abfd)->e_shstrndx,
1252 elf_section_data (sec)->rel_hdr.sh_name));
1253 if (name == NULL)
1254 return FALSE;
1255
1256 if (! CONST_STRNEQ (name, ".rela")
1257 || strcmp (bfd_get_section_name (abfd, sec),
1258 name + 5) != 0)
1259 {
1260 (*_bfd_error_handler)
1261 (_("%B: bad relocation section name `%s\'"),
1262 abfd, name);
1263 }
1264
1265 if (htab->elf.dynobj == NULL)
1266 htab->elf.dynobj = abfd;
1267
1268 dynobj = htab->elf.dynobj;
1269 sreloc = bfd_get_section_by_name (dynobj, name);
1270 if (sreloc == NULL)
1271 {
1272 flagword flags;
1273
1274 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1275 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1276 if ((sec->flags & SEC_ALLOC) != 0)
1277 flags |= SEC_ALLOC | SEC_LOAD;
1278 sreloc = bfd_make_section_with_flags (dynobj,
1279 name,
1280 flags);
1281 if (sreloc == NULL
1282 || ! bfd_set_section_alignment (dynobj, sreloc, 3))
1283 return FALSE;
1284 }
1285 elf_section_data (sec)->sreloc = sreloc;
1286 }
1287
1288 /* If this is a global symbol, we count the number of
1289 relocations we need for this symbol. */
1290 if (h != NULL)
1291 {
1292 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1293 }
1294 else
1295 {
1296 /* Track dynamic relocs needed for local syms too.
1297 We really need local syms available to do this
1298 easily. Oh well. */
1299
1300 asection *s;
1301 void *vpp;
1302
1303 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1304 sec, r_symndx);
1305 if (s == NULL)
1306 return FALSE;
1307
1308 vpp = &elf_section_data (s)->local_dynrel;
1309 head = (struct elf_s390_dyn_relocs **) vpp;
1310 }
1311
1312 p = *head;
1313 if (p == NULL || p->sec != sec)
1314 {
1315 bfd_size_type amt = sizeof *p;
1316 p = ((struct elf_s390_dyn_relocs *)
1317 bfd_alloc (htab->elf.dynobj, amt));
1318 if (p == NULL)
1319 return FALSE;
1320 p->next = *head;
1321 *head = p;
1322 p->sec = sec;
1323 p->count = 0;
1324 p->pc_count = 0;
1325 }
1326
1327 p->count += 1;
1328 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
1329 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1330 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
1331 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
1332 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
1333 p->pc_count += 1;
1334 }
1335 break;
1336
1337 /* This relocation describes the C++ object vtable hierarchy.
1338 Reconstruct it for later use during GC. */
1339 case R_390_GNU_VTINHERIT:
1340 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1341 return FALSE;
1342 break;
1343
1344 /* This relocation describes which C++ vtable entries are actually
1345 used. Record for later use during GC. */
1346 case R_390_GNU_VTENTRY:
1347 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1348 return FALSE;
1349 break;
1350
1351 default:
1352 break;
1353 }
1354 }
1355
1356 return TRUE;
1357 }
1358
1359 /* Return the section that should be marked against GC for a given
1360 relocation. */
1361
1362 static asection *
elf_s390_gc_mark_hook(asection * sec,struct bfd_link_info * info,Elf_Internal_Rela * rel,struct elf_link_hash_entry * h,Elf_Internal_Sym * sym)1363 elf_s390_gc_mark_hook (asection *sec,
1364 struct bfd_link_info *info,
1365 Elf_Internal_Rela *rel,
1366 struct elf_link_hash_entry *h,
1367 Elf_Internal_Sym *sym)
1368 {
1369 if (h != NULL)
1370 switch (ELF64_R_TYPE (rel->r_info))
1371 {
1372 case R_390_GNU_VTINHERIT:
1373 case R_390_GNU_VTENTRY:
1374 return NULL;
1375 }
1376
1377 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1378 }
1379
1380 /* Update the got entry reference counts for the section being removed. */
1381
1382 static bfd_boolean
elf_s390_gc_sweep_hook(bfd * abfd,struct bfd_link_info * info,asection * sec,const Elf_Internal_Rela * relocs)1383 elf_s390_gc_sweep_hook (bfd *abfd,
1384 struct bfd_link_info *info,
1385 asection *sec,
1386 const Elf_Internal_Rela *relocs)
1387 {
1388 Elf_Internal_Shdr *symtab_hdr;
1389 struct elf_link_hash_entry **sym_hashes;
1390 bfd_signed_vma *local_got_refcounts;
1391 const Elf_Internal_Rela *rel, *relend;
1392
1393 elf_section_data (sec)->local_dynrel = NULL;
1394
1395 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1396 sym_hashes = elf_sym_hashes (abfd);
1397 local_got_refcounts = elf_local_got_refcounts (abfd);
1398
1399 relend = relocs + sec->reloc_count;
1400 for (rel = relocs; rel < relend; rel++)
1401 {
1402 unsigned long r_symndx;
1403 unsigned int r_type;
1404 struct elf_link_hash_entry *h = NULL;
1405
1406 r_symndx = ELF64_R_SYM (rel->r_info);
1407 if (r_symndx >= symtab_hdr->sh_info)
1408 {
1409 struct elf_s390_link_hash_entry *eh;
1410 struct elf_s390_dyn_relocs **pp;
1411 struct elf_s390_dyn_relocs *p;
1412
1413 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1414 while (h->root.type == bfd_link_hash_indirect
1415 || h->root.type == bfd_link_hash_warning)
1416 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1417 eh = (struct elf_s390_link_hash_entry *) h;
1418
1419 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1420 if (p->sec == sec)
1421 {
1422 /* Everything must go for SEC. */
1423 *pp = p->next;
1424 break;
1425 }
1426 }
1427
1428 r_type = ELF64_R_TYPE (rel->r_info);
1429 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1430 switch (r_type)
1431 {
1432 case R_390_TLS_LDM64:
1433 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1434 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1435 break;
1436
1437 case R_390_TLS_GD64:
1438 case R_390_TLS_IE64:
1439 case R_390_TLS_GOTIE12:
1440 case R_390_TLS_GOTIE20:
1441 case R_390_TLS_GOTIE64:
1442 case R_390_TLS_IEENT:
1443 case R_390_GOT12:
1444 case R_390_GOT16:
1445 case R_390_GOT20:
1446 case R_390_GOT32:
1447 case R_390_GOT64:
1448 case R_390_GOTOFF16:
1449 case R_390_GOTOFF32:
1450 case R_390_GOTOFF64:
1451 case R_390_GOTPC:
1452 case R_390_GOTPCDBL:
1453 case R_390_GOTENT:
1454 if (h != NULL)
1455 {
1456 if (h->got.refcount > 0)
1457 h->got.refcount -= 1;
1458 }
1459 else if (local_got_refcounts != NULL)
1460 {
1461 if (local_got_refcounts[r_symndx] > 0)
1462 local_got_refcounts[r_symndx] -= 1;
1463 }
1464 break;
1465
1466 case R_390_8:
1467 case R_390_12:
1468 case R_390_16:
1469 case R_390_20:
1470 case R_390_32:
1471 case R_390_64:
1472 case R_390_PC16:
1473 case R_390_PC16DBL:
1474 case R_390_PC32:
1475 case R_390_PC32DBL:
1476 case R_390_PC64:
1477 if (info->shared)
1478 break;
1479 /* Fall through */
1480
1481 case R_390_PLT16DBL:
1482 case R_390_PLT32:
1483 case R_390_PLT32DBL:
1484 case R_390_PLT64:
1485 case R_390_PLTOFF16:
1486 case R_390_PLTOFF32:
1487 case R_390_PLTOFF64:
1488 if (h != NULL)
1489 {
1490 if (h->plt.refcount > 0)
1491 h->plt.refcount -= 1;
1492 }
1493 break;
1494
1495 case R_390_GOTPLT12:
1496 case R_390_GOTPLT16:
1497 case R_390_GOTPLT20:
1498 case R_390_GOTPLT32:
1499 case R_390_GOTPLT64:
1500 case R_390_GOTPLTENT:
1501 if (h != NULL)
1502 {
1503 if (h->plt.refcount > 0)
1504 {
1505 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1506 h->plt.refcount -= 1;
1507 }
1508 }
1509 else if (local_got_refcounts != NULL)
1510 {
1511 if (local_got_refcounts[r_symndx] > 0)
1512 local_got_refcounts[r_symndx] -= 1;
1513 }
1514 break;
1515
1516 default:
1517 break;
1518 }
1519 }
1520
1521 return TRUE;
1522 }
1523
1524 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1525 entry but we found we will not create any. Called when we find we will
1526 not have any PLT for this symbol, by for example
1527 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1528 or elf_s390_size_dynamic_sections if no dynamic sections will be
1529 created (we're only linking static objects). */
1530
1531 static void
elf_s390_adjust_gotplt(h)1532 elf_s390_adjust_gotplt (h)
1533 struct elf_s390_link_hash_entry *h;
1534 {
1535 if (h->elf.root.type == bfd_link_hash_warning)
1536 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1537
1538 if (h->gotplt_refcount <= 0)
1539 return;
1540
1541 /* We simply add the number of gotplt references to the number
1542 * of got references for this symbol. */
1543 h->elf.got.refcount += h->gotplt_refcount;
1544 h->gotplt_refcount = -1;
1545 }
1546
1547 /* Adjust a symbol defined by a dynamic object and referenced by a
1548 regular object. The current definition is in some section of the
1549 dynamic object, but we're not including those sections. We have to
1550 change the definition to something the rest of the link can
1551 understand. */
1552
1553 static bfd_boolean
elf_s390_adjust_dynamic_symbol(info,h)1554 elf_s390_adjust_dynamic_symbol (info, h)
1555 struct bfd_link_info *info;
1556 struct elf_link_hash_entry *h;
1557 {
1558 struct elf_s390_link_hash_table *htab;
1559 asection *s;
1560
1561 /* If this is a function, put it in the procedure linkage table. We
1562 will fill in the contents of the procedure linkage table later
1563 (although we could actually do it here). */
1564 if (h->type == STT_FUNC
1565 || h->needs_plt)
1566 {
1567 if (h->plt.refcount <= 0
1568 || (! info->shared
1569 && !h->def_dynamic
1570 && !h->ref_dynamic
1571 && h->root.type != bfd_link_hash_undefweak
1572 && h->root.type != bfd_link_hash_undefined))
1573 {
1574 /* This case can occur if we saw a PLT32 reloc in an input
1575 file, but the symbol was never referred to by a dynamic
1576 object, or if all references were garbage collected. In
1577 such a case, we don't actually need to build a procedure
1578 linkage table, and we can just do a PC32 reloc instead. */
1579 h->plt.offset = (bfd_vma) -1;
1580 h->needs_plt = 0;
1581 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1582 }
1583
1584 return TRUE;
1585 }
1586 else
1587 /* It's possible that we incorrectly decided a .plt reloc was
1588 needed for an R_390_PC32 reloc to a non-function sym in
1589 check_relocs. We can't decide accurately between function and
1590 non-function syms in check-relocs; Objects loaded later in
1591 the link may change h->type. So fix it now. */
1592 h->plt.offset = (bfd_vma) -1;
1593
1594 /* If this is a weak symbol, and there is a real definition, the
1595 processor independent code will have arranged for us to see the
1596 real definition first, and we can just use the same value. */
1597 if (h->u.weakdef != NULL)
1598 {
1599 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1600 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1601 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1602 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1603 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1604 h->non_got_ref = h->u.weakdef->non_got_ref;
1605 return TRUE;
1606 }
1607
1608 /* This is a reference to a symbol defined by a dynamic object which
1609 is not a function. */
1610
1611 /* If we are creating a shared library, we must presume that the
1612 only references to the symbol are via the global offset table.
1613 For such cases we need not do anything here; the relocations will
1614 be handled correctly by relocate_section. */
1615 if (info->shared)
1616 return TRUE;
1617
1618 /* If there are no references to this symbol that do not use the
1619 GOT, we don't need to generate a copy reloc. */
1620 if (!h->non_got_ref)
1621 return TRUE;
1622
1623 /* If -z nocopyreloc was given, we won't generate them either. */
1624 if (info->nocopyreloc)
1625 {
1626 h->non_got_ref = 0;
1627 return TRUE;
1628 }
1629
1630 if (ELIMINATE_COPY_RELOCS)
1631 {
1632 struct elf_s390_link_hash_entry * eh;
1633 struct elf_s390_dyn_relocs *p;
1634
1635 eh = (struct elf_s390_link_hash_entry *) h;
1636 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1637 {
1638 s = p->sec->output_section;
1639 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1640 break;
1641 }
1642
1643 /* If we didn't find any dynamic relocs in read-only sections, then
1644 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1645 if (p == NULL)
1646 {
1647 h->non_got_ref = 0;
1648 return TRUE;
1649 }
1650 }
1651
1652 if (h->size == 0)
1653 {
1654 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1655 h->root.root.string);
1656 return TRUE;
1657 }
1658
1659 /* We must allocate the symbol in our .dynbss section, which will
1660 become part of the .bss section of the executable. There will be
1661 an entry for this symbol in the .dynsym section. The dynamic
1662 object will contain position independent code, so all references
1663 from the dynamic object to this symbol will go through the global
1664 offset table. The dynamic linker will use the .dynsym entry to
1665 determine the address it must put in the global offset table, so
1666 both the dynamic object and the regular object will refer to the
1667 same memory location for the variable. */
1668
1669 htab = elf_s390_hash_table (info);
1670
1671 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1672 copy the initial value out of the dynamic object and into the
1673 runtime process image. */
1674 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1675 {
1676 htab->srelbss->size += sizeof (Elf64_External_Rela);
1677 h->needs_copy = 1;
1678 }
1679
1680 s = htab->sdynbss;
1681
1682 return _bfd_elf_adjust_dynamic_copy (h, s);
1683 }
1684
1685 /* Allocate space in .plt, .got and associated reloc sections for
1686 dynamic relocs. */
1687
1688 static bfd_boolean
allocate_dynrelocs(h,inf)1689 allocate_dynrelocs (h, inf)
1690 struct elf_link_hash_entry *h;
1691 PTR inf;
1692 {
1693 struct bfd_link_info *info;
1694 struct elf_s390_link_hash_table *htab;
1695 struct elf_s390_link_hash_entry *eh;
1696 struct elf_s390_dyn_relocs *p;
1697
1698 if (h->root.type == bfd_link_hash_indirect)
1699 return TRUE;
1700
1701 if (h->root.type == bfd_link_hash_warning)
1702 /* When warning symbols are created, they **replace** the "real"
1703 entry in the hash table, thus we never get to see the real
1704 symbol in a hash traversal. So look at it now. */
1705 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1706
1707 info = (struct bfd_link_info *) inf;
1708 htab = elf_s390_hash_table (info);
1709
1710 if (htab->elf.dynamic_sections_created
1711 && h->plt.refcount > 0
1712 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1713 || h->root.type != bfd_link_hash_undefweak))
1714 {
1715 /* Make sure this symbol is output as a dynamic symbol.
1716 Undefined weak syms won't yet be marked as dynamic. */
1717 if (h->dynindx == -1
1718 && !h->forced_local)
1719 {
1720 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1721 return FALSE;
1722 }
1723
1724 if (info->shared
1725 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1726 {
1727 asection *s = htab->splt;
1728
1729 /* If this is the first .plt entry, make room for the special
1730 first entry. */
1731 if (s->size == 0)
1732 s->size += PLT_FIRST_ENTRY_SIZE;
1733
1734 h->plt.offset = s->size;
1735
1736 /* If this symbol is not defined in a regular file, and we are
1737 not generating a shared library, then set the symbol to this
1738 location in the .plt. This is required to make function
1739 pointers compare as equal between the normal executable and
1740 the shared library. */
1741 if (! info->shared
1742 && !h->def_regular)
1743 {
1744 h->root.u.def.section = s;
1745 h->root.u.def.value = h->plt.offset;
1746 }
1747
1748 /* Make room for this entry. */
1749 s->size += PLT_ENTRY_SIZE;
1750
1751 /* We also need to make an entry in the .got.plt section, which
1752 will be placed in the .got section by the linker script. */
1753 htab->sgotplt->size += GOT_ENTRY_SIZE;
1754
1755 /* We also need to make an entry in the .rela.plt section. */
1756 htab->srelplt->size += sizeof (Elf64_External_Rela);
1757 }
1758 else
1759 {
1760 h->plt.offset = (bfd_vma) -1;
1761 h->needs_plt = 0;
1762 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1763 }
1764 }
1765 else
1766 {
1767 h->plt.offset = (bfd_vma) -1;
1768 h->needs_plt = 0;
1769 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1770 }
1771
1772 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to
1773 the binary, we can optimize a bit. IE64 and GOTIE64 get converted
1774 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT
1775 we can save the dynamic TLS relocation. */
1776 if (h->got.refcount > 0
1777 && !info->shared
1778 && h->dynindx == -1
1779 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1780 {
1781 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1782 /* For the GOTIE access without a literal pool entry the offset has
1783 to be stored somewhere. The immediate value in the instruction
1784 is not bit enough so the value is stored in the got. */
1785 {
1786 h->got.offset = htab->sgot->size;
1787 htab->sgot->size += GOT_ENTRY_SIZE;
1788 }
1789 else
1790 h->got.offset = (bfd_vma) -1;
1791 }
1792 else if (h->got.refcount > 0)
1793 {
1794 asection *s;
1795 bfd_boolean dyn;
1796 int tls_type = elf_s390_hash_entry(h)->tls_type;
1797
1798 /* Make sure this symbol is output as a dynamic symbol.
1799 Undefined weak syms won't yet be marked as dynamic. */
1800 if (h->dynindx == -1
1801 && !h->forced_local)
1802 {
1803 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1804 return FALSE;
1805 }
1806
1807 s = htab->sgot;
1808 h->got.offset = s->size;
1809 s->size += GOT_ENTRY_SIZE;
1810 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */
1811 if (tls_type == GOT_TLS_GD)
1812 s->size += GOT_ENTRY_SIZE;
1813 dyn = htab->elf.dynamic_sections_created;
1814 /* R_390_TLS_IE64 needs one dynamic relocation,
1815 R_390_TLS_GD64 needs one if local symbol and two if global. */
1816 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1817 || tls_type >= GOT_TLS_IE)
1818 htab->srelgot->size += sizeof (Elf64_External_Rela);
1819 else if (tls_type == GOT_TLS_GD)
1820 htab->srelgot->size += 2 * sizeof (Elf64_External_Rela);
1821 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1822 || h->root.type != bfd_link_hash_undefweak)
1823 && (info->shared
1824 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1825 htab->srelgot->size += sizeof (Elf64_External_Rela);
1826 }
1827 else
1828 h->got.offset = (bfd_vma) -1;
1829
1830 eh = (struct elf_s390_link_hash_entry *) h;
1831 if (eh->dyn_relocs == NULL)
1832 return TRUE;
1833
1834 /* In the shared -Bsymbolic case, discard space allocated for
1835 dynamic pc-relative relocs against symbols which turn out to be
1836 defined in regular objects. For the normal shared case, discard
1837 space for pc-relative relocs that have become local due to symbol
1838 visibility changes. */
1839
1840 if (info->shared)
1841 {
1842 if (SYMBOL_REFERENCES_LOCAL (info, h))
1843 {
1844 struct elf_s390_dyn_relocs **pp;
1845
1846 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1847 {
1848 p->count -= p->pc_count;
1849 p->pc_count = 0;
1850 if (p->count == 0)
1851 *pp = p->next;
1852 else
1853 pp = &p->next;
1854 }
1855 }
1856
1857 /* Also discard relocs on undefined weak syms with non-default
1858 visibility. */
1859 if (eh->dyn_relocs != NULL
1860 && h->root.type == bfd_link_hash_undefweak)
1861 {
1862 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1863 eh->dyn_relocs = NULL;
1864
1865 /* Make sure undefined weak symbols are output as a dynamic
1866 symbol in PIEs. */
1867 else if (h->dynindx == -1
1868 && !h->forced_local)
1869 {
1870 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1871 return FALSE;
1872 }
1873 }
1874 }
1875 else if (ELIMINATE_COPY_RELOCS)
1876 {
1877 /* For the non-shared case, discard space for relocs against
1878 symbols which turn out to need copy relocs or are not
1879 dynamic. */
1880
1881 if (!h->non_got_ref
1882 && ((h->def_dynamic
1883 && !h->def_regular)
1884 || (htab->elf.dynamic_sections_created
1885 && (h->root.type == bfd_link_hash_undefweak
1886 || h->root.type == bfd_link_hash_undefined))))
1887 {
1888 /* Make sure this symbol is output as a dynamic symbol.
1889 Undefined weak syms won't yet be marked as dynamic. */
1890 if (h->dynindx == -1
1891 && !h->forced_local)
1892 {
1893 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1894 return FALSE;
1895 }
1896
1897 /* If that succeeded, we know we'll be keeping all the
1898 relocs. */
1899 if (h->dynindx != -1)
1900 goto keep;
1901 }
1902
1903 eh->dyn_relocs = NULL;
1904
1905 keep: ;
1906 }
1907
1908 /* Finally, allocate space. */
1909 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1910 {
1911 asection *sreloc = elf_section_data (p->sec)->sreloc;
1912 sreloc->size += p->count * sizeof (Elf64_External_Rela);
1913 }
1914
1915 return TRUE;
1916 }
1917
1918 /* Find any dynamic relocs that apply to read-only sections. */
1919
1920 static bfd_boolean
readonly_dynrelocs(h,inf)1921 readonly_dynrelocs (h, inf)
1922 struct elf_link_hash_entry *h;
1923 PTR inf;
1924 {
1925 struct elf_s390_link_hash_entry *eh;
1926 struct elf_s390_dyn_relocs *p;
1927
1928 if (h->root.type == bfd_link_hash_warning)
1929 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1930
1931 eh = (struct elf_s390_link_hash_entry *) h;
1932 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1933 {
1934 asection *s = p->sec->output_section;
1935
1936 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1937 {
1938 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1939
1940 info->flags |= DF_TEXTREL;
1941
1942 /* Not an error, just cut short the traversal. */
1943 return FALSE;
1944 }
1945 }
1946 return TRUE;
1947 }
1948
1949 /* Set the sizes of the dynamic sections. */
1950
1951 static bfd_boolean
elf_s390_size_dynamic_sections(output_bfd,info)1952 elf_s390_size_dynamic_sections (output_bfd, info)
1953 bfd *output_bfd ATTRIBUTE_UNUSED;
1954 struct bfd_link_info *info;
1955 {
1956 struct elf_s390_link_hash_table *htab;
1957 bfd *dynobj;
1958 asection *s;
1959 bfd_boolean relocs;
1960 bfd *ibfd;
1961
1962 htab = elf_s390_hash_table (info);
1963 dynobj = htab->elf.dynobj;
1964 if (dynobj == NULL)
1965 abort ();
1966
1967 if (htab->elf.dynamic_sections_created)
1968 {
1969 /* Set the contents of the .interp section to the interpreter. */
1970 if (info->executable)
1971 {
1972 s = bfd_get_section_by_name (dynobj, ".interp");
1973 if (s == NULL)
1974 abort ();
1975 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1976 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1977 }
1978 }
1979
1980 /* Set up .got offsets for local syms, and space for local dynamic
1981 relocs. */
1982 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1983 {
1984 bfd_signed_vma *local_got;
1985 bfd_signed_vma *end_local_got;
1986 char *local_tls_type;
1987 bfd_size_type locsymcount;
1988 Elf_Internal_Shdr *symtab_hdr;
1989 asection *srela;
1990
1991 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1992 continue;
1993
1994 for (s = ibfd->sections; s != NULL; s = s->next)
1995 {
1996 struct elf_s390_dyn_relocs *p;
1997
1998 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
1999 {
2000 if (!bfd_is_abs_section (p->sec)
2001 && bfd_is_abs_section (p->sec->output_section))
2002 {
2003 /* Input section has been discarded, either because
2004 it is a copy of a linkonce section or due to
2005 linker script /DISCARD/, so we'll be discarding
2006 the relocs too. */
2007 }
2008 else if (p->count != 0)
2009 {
2010 srela = elf_section_data (p->sec)->sreloc;
2011 srela->size += p->count * sizeof (Elf64_External_Rela);
2012 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2013 info->flags |= DF_TEXTREL;
2014 }
2015 }
2016 }
2017
2018 local_got = elf_local_got_refcounts (ibfd);
2019 if (!local_got)
2020 continue;
2021
2022 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2023 locsymcount = symtab_hdr->sh_info;
2024 end_local_got = local_got + locsymcount;
2025 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2026 s = htab->sgot;
2027 srela = htab->srelgot;
2028 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2029 {
2030 if (*local_got > 0)
2031 {
2032 *local_got = s->size;
2033 s->size += GOT_ENTRY_SIZE;
2034 if (*local_tls_type == GOT_TLS_GD)
2035 s->size += GOT_ENTRY_SIZE;
2036 if (info->shared)
2037 srela->size += sizeof (Elf64_External_Rela);
2038 }
2039 else
2040 *local_got = (bfd_vma) -1;
2041 }
2042 }
2043
2044 if (htab->tls_ldm_got.refcount > 0)
2045 {
2046 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64
2047 relocs. */
2048 htab->tls_ldm_got.offset = htab->sgot->size;
2049 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2050 htab->srelgot->size += sizeof (Elf64_External_Rela);
2051 }
2052 else
2053 htab->tls_ldm_got.offset = -1;
2054
2055 /* Allocate global sym .plt and .got entries, and space for global
2056 sym dynamic relocs. */
2057 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2058
2059 /* We now have determined the sizes of the various dynamic sections.
2060 Allocate memory for them. */
2061 relocs = FALSE;
2062 for (s = dynobj->sections; s != NULL; s = s->next)
2063 {
2064 if ((s->flags & SEC_LINKER_CREATED) == 0)
2065 continue;
2066
2067 if (s == htab->splt
2068 || s == htab->sgot
2069 || s == htab->sgotplt
2070 || s == htab->sdynbss)
2071 {
2072 /* Strip this section if we don't need it; see the
2073 comment below. */
2074 }
2075 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2076 {
2077 if (s->size != 0 && s != htab->srelplt)
2078 relocs = TRUE;
2079
2080 /* We use the reloc_count field as a counter if we need
2081 to copy relocs into the output file. */
2082 s->reloc_count = 0;
2083 }
2084 else
2085 {
2086 /* It's not one of our sections, so don't allocate space. */
2087 continue;
2088 }
2089
2090 if (s->size == 0)
2091 {
2092 /* If we don't need this section, strip it from the
2093 output file. This is to handle .rela.bss and
2094 .rela.plt. We must create it in
2095 create_dynamic_sections, because it must be created
2096 before the linker maps input sections to output
2097 sections. The linker does that before
2098 adjust_dynamic_symbol is called, and it is that
2099 function which decides whether anything needs to go
2100 into these sections. */
2101
2102 s->flags |= SEC_EXCLUDE;
2103 continue;
2104 }
2105
2106 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2107 continue;
2108
2109 /* Allocate memory for the section contents. We use bfd_zalloc
2110 here in case unused entries are not reclaimed before the
2111 section's contents are written out. This should not happen,
2112 but this way if it does, we get a R_390_NONE reloc instead
2113 of garbage. */
2114 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2115 if (s->contents == NULL)
2116 return FALSE;
2117 }
2118
2119 if (htab->elf.dynamic_sections_created)
2120 {
2121 /* Add some entries to the .dynamic section. We fill in the
2122 values later, in elf_s390_finish_dynamic_sections, but we
2123 must add the entries now so that we get the correct size for
2124 the .dynamic section. The DT_DEBUG entry is filled in by the
2125 dynamic linker and used by the debugger. */
2126 #define add_dynamic_entry(TAG, VAL) \
2127 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2128
2129 if (info->executable)
2130 {
2131 if (!add_dynamic_entry (DT_DEBUG, 0))
2132 return FALSE;
2133 }
2134
2135 if (htab->splt->size != 0)
2136 {
2137 if (!add_dynamic_entry (DT_PLTGOT, 0)
2138 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2139 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2140 || !add_dynamic_entry (DT_JMPREL, 0))
2141 return FALSE;
2142 }
2143
2144 if (relocs)
2145 {
2146 if (!add_dynamic_entry (DT_RELA, 0)
2147 || !add_dynamic_entry (DT_RELASZ, 0)
2148 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2149 return FALSE;
2150
2151 /* If any dynamic relocs apply to a read-only section,
2152 then we need a DT_TEXTREL entry. */
2153 if ((info->flags & DF_TEXTREL) == 0)
2154 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2155 (PTR) info);
2156
2157 if ((info->flags & DF_TEXTREL) != 0)
2158 {
2159 if (!add_dynamic_entry (DT_TEXTREL, 0))
2160 return FALSE;
2161 }
2162 }
2163 }
2164 #undef add_dynamic_entry
2165
2166 return TRUE;
2167 }
2168
2169 /* Return the base VMA address which should be subtracted from real addresses
2170 when resolving @dtpoff relocation.
2171 This is PT_TLS segment p_vaddr. */
2172
2173 static bfd_vma
dtpoff_base(info)2174 dtpoff_base (info)
2175 struct bfd_link_info *info;
2176 {
2177 /* If tls_sec is NULL, we should have signalled an error already. */
2178 if (elf_hash_table (info)->tls_sec == NULL)
2179 return 0;
2180 return elf_hash_table (info)->tls_sec->vma;
2181 }
2182
2183 /* Return the relocation value for @tpoff relocation
2184 if STT_TLS virtual address is ADDRESS. */
2185
2186 static bfd_vma
tpoff(info,address)2187 tpoff (info, address)
2188 struct bfd_link_info *info;
2189 bfd_vma address;
2190 {
2191 struct elf_link_hash_table *htab = elf_hash_table (info);
2192
2193 /* If tls_sec is NULL, we should have signalled an error already. */
2194 if (htab->tls_sec == NULL)
2195 return 0;
2196 return htab->tls_size + htab->tls_sec->vma - address;
2197 }
2198
2199 /* Complain if TLS instruction relocation is against an invalid
2200 instruction. */
2201
2202 static void
invalid_tls_insn(input_bfd,input_section,rel)2203 invalid_tls_insn (input_bfd, input_section, rel)
2204 bfd *input_bfd;
2205 asection *input_section;
2206 Elf_Internal_Rela *rel;
2207 {
2208 reloc_howto_type *howto;
2209
2210 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
2211 (*_bfd_error_handler)
2212 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2213 input_bfd,
2214 input_section,
2215 (long) rel->r_offset,
2216 howto->name);
2217 bfd_set_error (bfd_error_bad_value);
2218 }
2219
2220 /* Relocate a 390 ELF section. */
2221
2222 static bfd_boolean
elf_s390_relocate_section(output_bfd,info,input_bfd,input_section,contents,relocs,local_syms,local_sections)2223 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2224 contents, relocs, local_syms, local_sections)
2225 bfd *output_bfd;
2226 struct bfd_link_info *info;
2227 bfd *input_bfd;
2228 asection *input_section;
2229 bfd_byte *contents;
2230 Elf_Internal_Rela *relocs;
2231 Elf_Internal_Sym *local_syms;
2232 asection **local_sections;
2233 {
2234 struct elf_s390_link_hash_table *htab;
2235 Elf_Internal_Shdr *symtab_hdr;
2236 struct elf_link_hash_entry **sym_hashes;
2237 bfd_vma *local_got_offsets;
2238 Elf_Internal_Rela *rel;
2239 Elf_Internal_Rela *relend;
2240
2241 htab = elf_s390_hash_table (info);
2242 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2243 sym_hashes = elf_sym_hashes (input_bfd);
2244 local_got_offsets = elf_local_got_offsets (input_bfd);
2245
2246 rel = relocs;
2247 relend = relocs + input_section->reloc_count;
2248 for (; rel < relend; rel++)
2249 {
2250 unsigned int r_type;
2251 reloc_howto_type *howto;
2252 unsigned long r_symndx;
2253 struct elf_link_hash_entry *h;
2254 Elf_Internal_Sym *sym;
2255 asection *sec;
2256 bfd_vma off;
2257 bfd_vma relocation;
2258 bfd_boolean unresolved_reloc;
2259 bfd_reloc_status_type r;
2260 int tls_type;
2261
2262 r_type = ELF64_R_TYPE (rel->r_info);
2263 if (r_type == (int) R_390_GNU_VTINHERIT
2264 || r_type == (int) R_390_GNU_VTENTRY)
2265 continue;
2266 if (r_type >= (int) R_390_max)
2267 {
2268 bfd_set_error (bfd_error_bad_value);
2269 return FALSE;
2270 }
2271
2272 howto = elf_howto_table + r_type;
2273 r_symndx = ELF64_R_SYM (rel->r_info);
2274
2275 h = NULL;
2276 sym = NULL;
2277 sec = NULL;
2278 unresolved_reloc = FALSE;
2279 if (r_symndx < symtab_hdr->sh_info)
2280 {
2281 sym = local_syms + r_symndx;
2282 sec = local_sections[r_symndx];
2283 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2284 }
2285 else
2286 {
2287 bfd_boolean warned ATTRIBUTE_UNUSED;
2288
2289 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2290 r_symndx, symtab_hdr, sym_hashes,
2291 h, sec, relocation,
2292 unresolved_reloc, warned);
2293 }
2294
2295 if (sec != NULL && elf_discarded_section (sec))
2296 {
2297 /* For relocs against symbols from removed linkonce sections,
2298 or sections discarded by a linker script, we just want the
2299 section contents zeroed. Avoid any special processing. */
2300 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2301 rel->r_info = 0;
2302 rel->r_addend = 0;
2303 continue;
2304 }
2305
2306 if (info->relocatable)
2307 continue;
2308
2309 switch (r_type)
2310 {
2311 case R_390_GOTPLT12:
2312 case R_390_GOTPLT16:
2313 case R_390_GOTPLT20:
2314 case R_390_GOTPLT32:
2315 case R_390_GOTPLT64:
2316 case R_390_GOTPLTENT:
2317 /* There are three cases for a GOTPLT relocation. 1) The
2318 relocation is against the jump slot entry of a plt that
2319 will get emitted to the output file. 2) The relocation
2320 is against the jump slot of a plt entry that has been
2321 removed. elf_s390_adjust_gotplt has created a GOT entry
2322 as replacement. 3) The relocation is against a local symbol.
2323 Cases 2) and 3) are the same as the GOT relocation code
2324 so we just have to test for case 1 and fall through for
2325 the other two. */
2326 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2327 {
2328 bfd_vma plt_index;
2329
2330 /* Calc. index no.
2331 Current offset - size first entry / entry size. */
2332 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2333 PLT_ENTRY_SIZE;
2334
2335 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2336 addr & GOT addr. */
2337 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2338 unresolved_reloc = FALSE;
2339
2340 if (r_type == R_390_GOTPLTENT)
2341 relocation += htab->sgot->output_section->vma;
2342 break;
2343 }
2344 /* Fall through. */
2345
2346 case R_390_GOT12:
2347 case R_390_GOT16:
2348 case R_390_GOT20:
2349 case R_390_GOT32:
2350 case R_390_GOT64:
2351 case R_390_GOTENT:
2352 /* Relocation is to the entry for this symbol in the global
2353 offset table. */
2354 if (htab->sgot == NULL)
2355 abort ();
2356
2357 if (h != NULL)
2358 {
2359 bfd_boolean dyn;
2360
2361 off = h->got.offset;
2362 dyn = htab->elf.dynamic_sections_created;
2363 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2364 || (info->shared
2365 && (info->symbolic
2366 || h->dynindx == -1
2367 || h->forced_local)
2368 && h->def_regular)
2369 || (ELF_ST_VISIBILITY (h->other)
2370 && h->root.type == bfd_link_hash_undefweak))
2371 {
2372 /* This is actually a static link, or it is a
2373 -Bsymbolic link and the symbol is defined
2374 locally, or the symbol was forced to be local
2375 because of a version file. We must initialize
2376 this entry in the global offset table. Since the
2377 offset must always be a multiple of 2, we use the
2378 least significant bit to record whether we have
2379 initialized it already.
2380
2381 When doing a dynamic link, we create a .rel.got
2382 relocation entry to initialize the value. This
2383 is done in the finish_dynamic_symbol routine. */
2384 if ((off & 1) != 0)
2385 off &= ~1;
2386 else
2387 {
2388 bfd_put_64 (output_bfd, relocation,
2389 htab->sgot->contents + off);
2390 h->got.offset |= 1;
2391 }
2392 }
2393 else
2394 unresolved_reloc = FALSE;
2395 }
2396 else
2397 {
2398 if (local_got_offsets == NULL)
2399 abort ();
2400
2401 off = local_got_offsets[r_symndx];
2402
2403 /* The offset must always be a multiple of 8. We use
2404 the least significant bit to record whether we have
2405 already generated the necessary reloc. */
2406 if ((off & 1) != 0)
2407 off &= ~1;
2408 else
2409 {
2410 bfd_put_64 (output_bfd, relocation,
2411 htab->sgot->contents + off);
2412
2413 if (info->shared)
2414 {
2415 asection *s;
2416 Elf_Internal_Rela outrel;
2417 bfd_byte *loc;
2418
2419 s = htab->srelgot;
2420 if (s == NULL)
2421 abort ();
2422
2423 outrel.r_offset = (htab->sgot->output_section->vma
2424 + htab->sgot->output_offset
2425 + off);
2426 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2427 outrel.r_addend = relocation;
2428 loc = s->contents;
2429 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2430 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2431 }
2432
2433 local_got_offsets[r_symndx] |= 1;
2434 }
2435 }
2436
2437 if (off >= (bfd_vma) -2)
2438 abort ();
2439
2440 relocation = htab->sgot->output_offset + off;
2441
2442 /* For @GOTENT the relocation is against the offset between
2443 the instruction and the symbols entry in the GOT and not
2444 between the start of the GOT and the symbols entry. We
2445 add the vma of the GOT to get the correct value. */
2446 if ( r_type == R_390_GOTENT
2447 || r_type == R_390_GOTPLTENT)
2448 relocation += htab->sgot->output_section->vma;
2449
2450 break;
2451
2452 case R_390_GOTOFF16:
2453 case R_390_GOTOFF32:
2454 case R_390_GOTOFF64:
2455 /* Relocation is relative to the start of the global offset
2456 table. */
2457
2458 /* Note that sgot->output_offset is not involved in this
2459 calculation. We always want the start of .got. If we
2460 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2461 permitted by the ABI, we might have to change this
2462 calculation. */
2463 relocation -= htab->sgot->output_section->vma;
2464 break;
2465
2466 case R_390_GOTPC:
2467 case R_390_GOTPCDBL:
2468 /* Use global offset table as symbol value. */
2469 relocation = htab->sgot->output_section->vma;
2470 unresolved_reloc = FALSE;
2471 break;
2472
2473 case R_390_PLT16DBL:
2474 case R_390_PLT32:
2475 case R_390_PLT32DBL:
2476 case R_390_PLT64:
2477 /* Relocation is to the entry for this symbol in the
2478 procedure linkage table. */
2479
2480 /* Resolve a PLT32 reloc against a local symbol directly,
2481 without using the procedure linkage table. */
2482 if (h == NULL)
2483 break;
2484
2485 if (h->plt.offset == (bfd_vma) -1
2486 || htab->splt == NULL)
2487 {
2488 /* We didn't make a PLT entry for this symbol. This
2489 happens when statically linking PIC code, or when
2490 using -Bsymbolic. */
2491 break;
2492 }
2493
2494 relocation = (htab->splt->output_section->vma
2495 + htab->splt->output_offset
2496 + h->plt.offset);
2497 unresolved_reloc = FALSE;
2498 break;
2499
2500 case R_390_PLTOFF16:
2501 case R_390_PLTOFF32:
2502 case R_390_PLTOFF64:
2503 /* Relocation is to the entry for this symbol in the
2504 procedure linkage table relative to the start of the GOT. */
2505
2506 /* For local symbols or if we didn't make a PLT entry for
2507 this symbol resolve the symbol directly. */
2508 if ( h == NULL
2509 || h->plt.offset == (bfd_vma) -1
2510 || htab->splt == NULL)
2511 {
2512 relocation -= htab->sgot->output_section->vma;
2513 break;
2514 }
2515
2516 relocation = (htab->splt->output_section->vma
2517 + htab->splt->output_offset
2518 + h->plt.offset
2519 - htab->sgot->output_section->vma);
2520 unresolved_reloc = FALSE;
2521 break;
2522
2523 case R_390_8:
2524 case R_390_16:
2525 case R_390_32:
2526 case R_390_64:
2527 case R_390_PC16:
2528 case R_390_PC16DBL:
2529 case R_390_PC32:
2530 case R_390_PC32DBL:
2531 case R_390_PC64:
2532 if ((input_section->flags & SEC_ALLOC) == 0)
2533 break;
2534
2535 if ((info->shared
2536 && (h == NULL
2537 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2538 || h->root.type != bfd_link_hash_undefweak)
2539 && ((r_type != R_390_PC16
2540 && r_type != R_390_PC16DBL
2541 && r_type != R_390_PC32
2542 && r_type != R_390_PC32DBL
2543 && r_type != R_390_PC64)
2544 || (h != NULL
2545 && !SYMBOL_REFERENCES_LOCAL (info, h))))
2546 || (ELIMINATE_COPY_RELOCS
2547 && !info->shared
2548 && h != NULL
2549 && h->dynindx != -1
2550 && !h->non_got_ref
2551 && ((h->def_dynamic
2552 && !h->def_regular)
2553 || h->root.type == bfd_link_hash_undefweak
2554 || h->root.type == bfd_link_hash_undefined)))
2555 {
2556 Elf_Internal_Rela outrel;
2557 bfd_boolean skip, relocate;
2558 asection *sreloc;
2559 bfd_byte *loc;
2560
2561 /* When generating a shared object, these relocations
2562 are copied into the output file to be resolved at run
2563 time. */
2564 skip = FALSE;
2565 relocate = FALSE;
2566
2567 outrel.r_offset =
2568 _bfd_elf_section_offset (output_bfd, info, input_section,
2569 rel->r_offset);
2570 if (outrel.r_offset == (bfd_vma) -1)
2571 skip = TRUE;
2572 else if (outrel.r_offset == (bfd_vma) -2)
2573 skip = TRUE, relocate = TRUE;
2574
2575 outrel.r_offset += (input_section->output_section->vma
2576 + input_section->output_offset);
2577
2578 if (skip)
2579 memset (&outrel, 0, sizeof outrel);
2580 else if (h != NULL
2581 && h->dynindx != -1
2582 && (r_type == R_390_PC16
2583 || r_type == R_390_PC16DBL
2584 || r_type == R_390_PC32
2585 || r_type == R_390_PC32DBL
2586 || r_type == R_390_PC64
2587 || !info->shared
2588 || !info->symbolic
2589 || !h->def_regular))
2590 {
2591 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2592 outrel.r_addend = rel->r_addend;
2593 }
2594 else
2595 {
2596 /* This symbol is local, or marked to become local. */
2597 outrel.r_addend = relocation + rel->r_addend;
2598 if (r_type == R_390_64)
2599 {
2600 relocate = TRUE;
2601 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2602 }
2603 else
2604 {
2605 long sindx;
2606
2607 if (bfd_is_abs_section (sec))
2608 sindx = 0;
2609 else if (sec == NULL || sec->owner == NULL)
2610 {
2611 bfd_set_error(bfd_error_bad_value);
2612 return FALSE;
2613 }
2614 else
2615 {
2616 asection *osec;
2617
2618 osec = sec->output_section;
2619 sindx = elf_section_data (osec)->dynindx;
2620
2621 if (sindx == 0)
2622 {
2623 osec = htab->elf.text_index_section;
2624 sindx = elf_section_data (osec)->dynindx;
2625 }
2626 BFD_ASSERT (sindx != 0);
2627
2628 /* We are turning this relocation into one
2629 against a section symbol, so subtract out
2630 the output section's address but not the
2631 offset of the input section in the output
2632 section. */
2633 outrel.r_addend -= osec->vma;
2634 }
2635 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2636 }
2637 }
2638
2639 sreloc = elf_section_data (input_section)->sreloc;
2640 if (sreloc == NULL)
2641 abort ();
2642
2643 loc = sreloc->contents;
2644 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2645 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2646
2647 /* If this reloc is against an external symbol, we do
2648 not want to fiddle with the addend. Otherwise, we
2649 need to include the symbol value so that it becomes
2650 an addend for the dynamic reloc. */
2651 if (! relocate)
2652 continue;
2653 }
2654
2655 break;
2656
2657 /* Relocations for tls literal pool entries. */
2658 case R_390_TLS_IE64:
2659 if (info->shared)
2660 {
2661 Elf_Internal_Rela outrel;
2662 asection *sreloc;
2663 bfd_byte *loc;
2664
2665 outrel.r_offset = rel->r_offset
2666 + input_section->output_section->vma
2667 + input_section->output_offset;
2668 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2669 sreloc = elf_section_data (input_section)->sreloc;
2670 if (sreloc == NULL)
2671 abort ();
2672 loc = sreloc->contents;
2673 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2674 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2675 }
2676 /* Fall through. */
2677
2678 case R_390_TLS_GD64:
2679 case R_390_TLS_GOTIE64:
2680 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2681 tls_type = GOT_UNKNOWN;
2682 if (h == NULL && local_got_offsets)
2683 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2684 else if (h != NULL)
2685 {
2686 tls_type = elf_s390_hash_entry(h)->tls_type;
2687 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2688 r_type = R_390_TLS_LE64;
2689 }
2690 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2691 r_type = R_390_TLS_IE64;
2692
2693 if (r_type == R_390_TLS_LE64)
2694 {
2695 /* This relocation gets optimized away by the local exec
2696 access optimization. */
2697 BFD_ASSERT (! unresolved_reloc);
2698 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2699 contents + rel->r_offset);
2700 continue;
2701 }
2702
2703 if (htab->sgot == NULL)
2704 abort ();
2705
2706 if (h != NULL)
2707 off = h->got.offset;
2708 else
2709 {
2710 if (local_got_offsets == NULL)
2711 abort ();
2712
2713 off = local_got_offsets[r_symndx];
2714 }
2715
2716 emit_tls_relocs:
2717
2718 if ((off & 1) != 0)
2719 off &= ~1;
2720 else
2721 {
2722 Elf_Internal_Rela outrel;
2723 bfd_byte *loc;
2724 int dr_type, indx;
2725
2726 if (htab->srelgot == NULL)
2727 abort ();
2728
2729 outrel.r_offset = (htab->sgot->output_section->vma
2730 + htab->sgot->output_offset + off);
2731
2732 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2733 if (r_type == R_390_TLS_GD64)
2734 dr_type = R_390_TLS_DTPMOD;
2735 else
2736 dr_type = R_390_TLS_TPOFF;
2737 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2738 outrel.r_addend = relocation - dtpoff_base (info);
2739 else
2740 outrel.r_addend = 0;
2741 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2742 loc = htab->srelgot->contents;
2743 loc += htab->srelgot->reloc_count++
2744 * sizeof (Elf64_External_Rela);
2745 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2746
2747 if (r_type == R_390_TLS_GD64)
2748 {
2749 if (indx == 0)
2750 {
2751 BFD_ASSERT (! unresolved_reloc);
2752 bfd_put_64 (output_bfd,
2753 relocation - dtpoff_base (info),
2754 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2755 }
2756 else
2757 {
2758 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
2759 outrel.r_offset += GOT_ENTRY_SIZE;
2760 outrel.r_addend = 0;
2761 htab->srelgot->reloc_count++;
2762 loc += sizeof (Elf64_External_Rela);
2763 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2764 }
2765 }
2766
2767 if (h != NULL)
2768 h->got.offset |= 1;
2769 else
2770 local_got_offsets[r_symndx] |= 1;
2771 }
2772
2773 if (off >= (bfd_vma) -2)
2774 abort ();
2775 if (r_type == ELF64_R_TYPE (rel->r_info))
2776 {
2777 relocation = htab->sgot->output_offset + off;
2778 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
2779 relocation += htab->sgot->output_section->vma;
2780 unresolved_reloc = FALSE;
2781 }
2782 else
2783 {
2784 bfd_put_64 (output_bfd, htab->sgot->output_offset + off,
2785 contents + rel->r_offset);
2786 continue;
2787 }
2788 break;
2789
2790 case R_390_TLS_GOTIE12:
2791 case R_390_TLS_GOTIE20:
2792 case R_390_TLS_IEENT:
2793 if (h == NULL)
2794 {
2795 if (local_got_offsets == NULL)
2796 abort();
2797 off = local_got_offsets[r_symndx];
2798 if (info->shared)
2799 goto emit_tls_relocs;
2800 }
2801 else
2802 {
2803 off = h->got.offset;
2804 tls_type = elf_s390_hash_entry(h)->tls_type;
2805 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2806 goto emit_tls_relocs;
2807 }
2808
2809 if (htab->sgot == NULL)
2810 abort ();
2811
2812 BFD_ASSERT (! unresolved_reloc);
2813 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2814 htab->sgot->contents + off);
2815 relocation = htab->sgot->output_offset + off;
2816 if (r_type == R_390_TLS_IEENT)
2817 relocation += htab->sgot->output_section->vma;
2818 unresolved_reloc = FALSE;
2819 break;
2820
2821 case R_390_TLS_LDM64:
2822 if (! info->shared)
2823 /* The literal pool entry this relocation refers to gets ignored
2824 by the optimized code of the local exec model. Do nothing
2825 and the value will turn out zero. */
2826 continue;
2827
2828 if (htab->sgot == NULL)
2829 abort ();
2830
2831 off = htab->tls_ldm_got.offset;
2832 if (off & 1)
2833 off &= ~1;
2834 else
2835 {
2836 Elf_Internal_Rela outrel;
2837 bfd_byte *loc;
2838
2839 if (htab->srelgot == NULL)
2840 abort ();
2841
2842 outrel.r_offset = (htab->sgot->output_section->vma
2843 + htab->sgot->output_offset + off);
2844
2845 bfd_put_64 (output_bfd, 0,
2846 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2847 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
2848 outrel.r_addend = 0;
2849 loc = htab->srelgot->contents;
2850 loc += htab->srelgot->reloc_count++
2851 * sizeof (Elf64_External_Rela);
2852 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2853 htab->tls_ldm_got.offset |= 1;
2854 }
2855 relocation = htab->sgot->output_offset + off;
2856 unresolved_reloc = FALSE;
2857 break;
2858
2859 case R_390_TLS_LE64:
2860 if (info->shared)
2861 {
2862 /* Linking a shared library with non-fpic code requires
2863 a R_390_TLS_TPOFF relocation. */
2864 Elf_Internal_Rela outrel;
2865 asection *sreloc;
2866 bfd_byte *loc;
2867 int indx;
2868
2869 outrel.r_offset = rel->r_offset
2870 + input_section->output_section->vma
2871 + input_section->output_offset;
2872 if (h != NULL && h->dynindx != -1)
2873 indx = h->dynindx;
2874 else
2875 indx = 0;
2876 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
2877 if (indx == 0)
2878 outrel.r_addend = relocation - dtpoff_base (info);
2879 else
2880 outrel.r_addend = 0;
2881 sreloc = elf_section_data (input_section)->sreloc;
2882 if (sreloc == NULL)
2883 abort ();
2884 loc = sreloc->contents;
2885 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2886 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2887 }
2888 else
2889 {
2890 BFD_ASSERT (! unresolved_reloc);
2891 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2892 contents + rel->r_offset);
2893 }
2894 continue;
2895
2896 case R_390_TLS_LDO64:
2897 if (info->shared)
2898 relocation -= dtpoff_base (info);
2899 else
2900 /* When converting LDO to LE, we must negate. */
2901 relocation = -tpoff (info, relocation);
2902 break;
2903
2904 /* Relocations for tls instructions. */
2905 case R_390_TLS_LOAD:
2906 case R_390_TLS_GDCALL:
2907 case R_390_TLS_LDCALL:
2908 tls_type = GOT_UNKNOWN;
2909 if (h == NULL && local_got_offsets)
2910 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2911 else if (h != NULL)
2912 tls_type = elf_s390_hash_entry(h)->tls_type;
2913
2914 if (tls_type == GOT_TLS_GD)
2915 continue;
2916
2917 if (r_type == R_390_TLS_LOAD)
2918 {
2919 if (!info->shared && (h == NULL || h->dynindx == -1))
2920 {
2921 /* IE->LE transition. Four valid cases:
2922 lg %rx,(0,%ry) -> sllg %rx,%ry,0
2923 lg %rx,(%ry,0) -> sllg %rx,%ry,0
2924 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
2925 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
2926 unsigned int insn0, insn1, ry;
2927
2928 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2929 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2930 if (insn1 != 0x0004)
2931 invalid_tls_insn (input_bfd, input_section, rel);
2932 ry = 0;
2933 if ((insn0 & 0xff00f000) == 0xe3000000)
2934 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
2935 ry = (insn0 & 0x000f0000);
2936 else if ((insn0 & 0xff0f0000) == 0xe3000000)
2937 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
2938 ry = (insn0 & 0x0000f000) << 4;
2939 else if ((insn0 & 0xff00f000) == 0xe300c000)
2940 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
2941 ry = (insn0 & 0x000f0000);
2942 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
2943 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
2944 ry = (insn0 & 0x0000f000) << 4;
2945 else
2946 invalid_tls_insn (input_bfd, input_section, rel);
2947 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
2948 insn1 = 0x000d;
2949 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2950 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2951 }
2952 }
2953 else if (r_type == R_390_TLS_GDCALL)
2954 {
2955 unsigned int insn0, insn1;
2956
2957 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2958 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2959 if ((insn0 & 0xffff0000) != 0xc0e50000)
2960 invalid_tls_insn (input_bfd, input_section, rel);
2961 if (!info->shared && (h == NULL || h->dynindx == -1))
2962 {
2963 /* GD->LE transition.
2964 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2965 insn0 = 0xc0040000;
2966 insn1 = 0x0000;
2967 }
2968 else
2969 {
2970 /* GD->IE transition.
2971 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
2972 insn0 = 0xe322c000;
2973 insn1 = 0x0004;
2974 }
2975 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2976 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2977 }
2978 else if (r_type == R_390_TLS_LDCALL)
2979 {
2980 if (!info->shared)
2981 {
2982 unsigned int insn0, insn1;
2983
2984 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2985 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2986 if ((insn0 & 0xffff0000) != 0xc0e50000)
2987 invalid_tls_insn (input_bfd, input_section, rel);
2988 /* LD->LE transition.
2989 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2990 insn0 = 0xc0040000;
2991 insn1 = 0x0000;
2992 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2993 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2994 }
2995 }
2996 continue;
2997
2998 default:
2999 break;
3000 }
3001
3002 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3003 because such sections are not SEC_ALLOC and thus ld.so will
3004 not process them. */
3005 if (unresolved_reloc
3006 && !((input_section->flags & SEC_DEBUGGING) != 0
3007 && h->def_dynamic))
3008 (*_bfd_error_handler)
3009 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3010 input_bfd,
3011 input_section,
3012 (long) rel->r_offset,
3013 howto->name,
3014 h->root.root.string);
3015
3016 if (r_type == R_390_20
3017 || r_type == R_390_GOT20
3018 || r_type == R_390_GOTPLT20
3019 || r_type == R_390_TLS_GOTIE20)
3020 {
3021 relocation += rel->r_addend;
3022 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3023 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3024 contents, rel->r_offset,
3025 relocation, 0);
3026 }
3027 else
3028 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3029 contents, rel->r_offset,
3030 relocation, rel->r_addend);
3031
3032 if (r != bfd_reloc_ok)
3033 {
3034 const char *name;
3035
3036 if (h != NULL)
3037 name = h->root.root.string;
3038 else
3039 {
3040 name = bfd_elf_string_from_elf_section (input_bfd,
3041 symtab_hdr->sh_link,
3042 sym->st_name);
3043 if (name == NULL)
3044 return FALSE;
3045 if (*name == '\0')
3046 name = bfd_section_name (input_bfd, sec);
3047 }
3048
3049 if (r == bfd_reloc_overflow)
3050 {
3051
3052 if (! ((*info->callbacks->reloc_overflow)
3053 (info, (h ? &h->root : NULL), name, howto->name,
3054 (bfd_vma) 0, input_bfd, input_section,
3055 rel->r_offset)))
3056 return FALSE;
3057 }
3058 else
3059 {
3060 (*_bfd_error_handler)
3061 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3062 input_bfd, input_section,
3063 (long) rel->r_offset, name, (int) r);
3064 return FALSE;
3065 }
3066 }
3067 }
3068
3069 return TRUE;
3070 }
3071
3072 /* Finish up dynamic symbol handling. We set the contents of various
3073 dynamic sections here. */
3074
3075 static bfd_boolean
elf_s390_finish_dynamic_symbol(output_bfd,info,h,sym)3076 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3077 bfd *output_bfd;
3078 struct bfd_link_info *info;
3079 struct elf_link_hash_entry *h;
3080 Elf_Internal_Sym *sym;
3081 {
3082 struct elf_s390_link_hash_table *htab;
3083
3084 htab = elf_s390_hash_table (info);
3085
3086 if (h->plt.offset != (bfd_vma) -1)
3087 {
3088 bfd_vma plt_index;
3089 bfd_vma got_offset;
3090 Elf_Internal_Rela rela;
3091 bfd_byte *loc;
3092
3093 /* This symbol has an entry in the procedure linkage table. Set
3094 it up. */
3095
3096 if (h->dynindx == -1
3097 || htab->splt == NULL
3098 || htab->sgotplt == NULL
3099 || htab->srelplt == NULL)
3100 abort ();
3101
3102 /* Calc. index no.
3103 Current offset - size first entry / entry size. */
3104 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3105
3106 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
3107 addr & GOT addr. */
3108 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3109
3110 /* Fill in the blueprint of a PLT. */
3111 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3112 htab->splt->contents + h->plt.offset);
3113 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3114 htab->splt->contents + h->plt.offset + 4);
3115 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3116 htab->splt->contents + h->plt.offset + 8);
3117 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3118 htab->splt->contents + h->plt.offset + 12);
3119 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3120 htab->splt->contents + h->plt.offset + 16);
3121 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5,
3122 htab->splt->contents + h->plt.offset + 20);
3123 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6,
3124 htab->splt->contents + h->plt.offset + 24);
3125 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7,
3126 htab->splt->contents + h->plt.offset + 28);
3127 /* Fixup the relative address to the GOT entry */
3128 bfd_put_32 (output_bfd,
3129 (htab->sgotplt->output_section->vma +
3130 htab->sgotplt->output_offset + got_offset
3131 - (htab->splt->output_section->vma + h->plt.offset))/2,
3132 htab->splt->contents + h->plt.offset + 2);
3133 /* Fixup the relative branch to PLT 0 */
3134 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3135 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3136 htab->splt->contents + h->plt.offset + 24);
3137 /* Fixup offset into symbol table */
3138 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3139 htab->splt->contents + h->plt.offset + 28);
3140
3141 /* Fill in the entry in the global offset table.
3142 Points to instruction after GOT offset. */
3143 bfd_put_64 (output_bfd,
3144 (htab->splt->output_section->vma
3145 + htab->splt->output_offset
3146 + h->plt.offset
3147 + 14),
3148 htab->sgotplt->contents + got_offset);
3149
3150 /* Fill in the entry in the .rela.plt section. */
3151 rela.r_offset = (htab->sgotplt->output_section->vma
3152 + htab->sgotplt->output_offset
3153 + got_offset);
3154 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3155 rela.r_addend = 0;
3156 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela);
3157 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3158
3159 if (!h->def_regular)
3160 {
3161 /* Mark the symbol as undefined, rather than as defined in
3162 the .plt section. Leave the value alone. This is a clue
3163 for the dynamic linker, to make function pointer
3164 comparisons work between an application and shared
3165 library. */
3166 sym->st_shndx = SHN_UNDEF;
3167 }
3168 }
3169
3170 if (h->got.offset != (bfd_vma) -1
3171 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3172 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3173 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3174 {
3175 Elf_Internal_Rela rela;
3176 bfd_byte *loc;
3177
3178 /* This symbol has an entry in the global offset table. Set it
3179 up. */
3180 if (htab->sgot == NULL || htab->srelgot == NULL)
3181 abort ();
3182
3183 rela.r_offset = (htab->sgot->output_section->vma
3184 + htab->sgot->output_offset
3185 + (h->got.offset &~ (bfd_vma) 1));
3186
3187 /* If this is a static link, or it is a -Bsymbolic link and the
3188 symbol is defined locally or was forced to be local because
3189 of a version file, we just want to emit a RELATIVE reloc.
3190 The entry in the global offset table will already have been
3191 initialized in the relocate_section function. */
3192 if (info->shared
3193 && (info->symbolic
3194 || h->dynindx == -1
3195 || h->forced_local)
3196 && h->def_regular)
3197 {
3198 BFD_ASSERT((h->got.offset & 1) != 0);
3199 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3200 rela.r_addend = (h->root.u.def.value
3201 + h->root.u.def.section->output_section->vma
3202 + h->root.u.def.section->output_offset);
3203 }
3204 else
3205 {
3206 BFD_ASSERT((h->got.offset & 1) == 0);
3207 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3208 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3209 rela.r_addend = 0;
3210 }
3211
3212 loc = htab->srelgot->contents;
3213 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3214 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3215 }
3216
3217 if (h->needs_copy)
3218 {
3219 Elf_Internal_Rela rela;
3220 bfd_byte *loc;
3221
3222 /* This symbols needs a copy reloc. Set it up. */
3223
3224 if (h->dynindx == -1
3225 || (h->root.type != bfd_link_hash_defined
3226 && h->root.type != bfd_link_hash_defweak)
3227 || htab->srelbss == NULL)
3228 abort ();
3229
3230 rela.r_offset = (h->root.u.def.value
3231 + h->root.u.def.section->output_section->vma
3232 + h->root.u.def.section->output_offset);
3233 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3234 rela.r_addend = 0;
3235 loc = htab->srelbss->contents;
3236 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3237 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3238 }
3239
3240 /* Mark some specially defined symbols as absolute. */
3241 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3242 || h == htab->elf.hgot
3243 || h == htab->elf.hplt)
3244 sym->st_shndx = SHN_ABS;
3245
3246 return TRUE;
3247 }
3248
3249 /* Used to decide how to sort relocs in an optimal manner for the
3250 dynamic linker, before writing them out. */
3251
3252 static enum elf_reloc_type_class
elf_s390_reloc_type_class(rela)3253 elf_s390_reloc_type_class (rela)
3254 const Elf_Internal_Rela *rela;
3255 {
3256 switch ((int) ELF64_R_TYPE (rela->r_info))
3257 {
3258 case R_390_RELATIVE:
3259 return reloc_class_relative;
3260 case R_390_JMP_SLOT:
3261 return reloc_class_plt;
3262 case R_390_COPY:
3263 return reloc_class_copy;
3264 default:
3265 return reloc_class_normal;
3266 }
3267 }
3268
3269 /* Finish up the dynamic sections. */
3270
3271 static bfd_boolean
elf_s390_finish_dynamic_sections(output_bfd,info)3272 elf_s390_finish_dynamic_sections (output_bfd, info)
3273 bfd *output_bfd;
3274 struct bfd_link_info *info;
3275 {
3276 struct elf_s390_link_hash_table *htab;
3277 bfd *dynobj;
3278 asection *sdyn;
3279
3280 htab = elf_s390_hash_table (info);
3281 dynobj = htab->elf.dynobj;
3282 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3283
3284 if (htab->elf.dynamic_sections_created)
3285 {
3286 Elf64_External_Dyn *dyncon, *dynconend;
3287
3288 if (sdyn == NULL || htab->sgot == NULL)
3289 abort ();
3290
3291 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3292 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3293 for (; dyncon < dynconend; dyncon++)
3294 {
3295 Elf_Internal_Dyn dyn;
3296 asection *s;
3297
3298 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3299
3300 switch (dyn.d_tag)
3301 {
3302 default:
3303 continue;
3304
3305 case DT_PLTGOT:
3306 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3307 break;
3308
3309 case DT_JMPREL:
3310 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3311 break;
3312
3313 case DT_PLTRELSZ:
3314 s = htab->srelplt->output_section;
3315 dyn.d_un.d_val = s->size;
3316 break;
3317
3318 case DT_RELASZ:
3319 /* The procedure linkage table relocs (DT_JMPREL) should
3320 not be included in the overall relocs (DT_RELA).
3321 Therefore, we override the DT_RELASZ entry here to
3322 make it not include the JMPREL relocs. Since the
3323 linker script arranges for .rela.plt to follow all
3324 other relocation sections, we don't have to worry
3325 about changing the DT_RELA entry. */
3326 s = htab->srelplt->output_section;
3327 dyn.d_un.d_val -= s->size;
3328 break;
3329 }
3330
3331 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3332 }
3333
3334 /* Fill in the special first entry in the procedure linkage table. */
3335 if (htab->splt && htab->splt->size > 0)
3336 {
3337 /* fill in blueprint for plt 0 entry */
3338 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0,
3339 htab->splt->contents );
3340 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3341 htab->splt->contents +4 );
3342 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3343 htab->splt->contents +12 );
3344 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3345 htab->splt->contents +16 );
3346 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3347 htab->splt->contents +20 );
3348 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6,
3349 htab->splt->contents + 24);
3350 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7,
3351 htab->splt->contents + 28 );
3352 /* Fixup relative address to start of GOT */
3353 bfd_put_32 (output_bfd,
3354 (htab->sgotplt->output_section->vma +
3355 htab->sgotplt->output_offset
3356 - htab->splt->output_section->vma - 6)/2,
3357 htab->splt->contents + 8);
3358 }
3359 elf_section_data (htab->splt->output_section)
3360 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE;
3361 }
3362
3363 if (htab->sgotplt)
3364 {
3365 /* Fill in the first three entries in the global offset table. */
3366 if (htab->sgotplt->size > 0)
3367 {
3368 bfd_put_64 (output_bfd,
3369 (sdyn == NULL ? (bfd_vma) 0
3370 : sdyn->output_section->vma + sdyn->output_offset),
3371 htab->sgotplt->contents);
3372 /* One entry for shared object struct ptr. */
3373 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3374 /* One entry for _dl_runtime_resolve. */
3375 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12);
3376 }
3377
3378 elf_section_data (htab->sgot->output_section)
3379 ->this_hdr.sh_entsize = 8;
3380 }
3381 return TRUE;
3382 }
3383
3384 /* Return address for Ith PLT stub in section PLT, for relocation REL
3385 or (bfd_vma) -1 if it should not be included. */
3386
3387 static bfd_vma
elf_s390_plt_sym_val(bfd_vma i,const asection * plt,const arelent * rel ATTRIBUTE_UNUSED)3388 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3389 const arelent *rel ATTRIBUTE_UNUSED)
3390 {
3391 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3392 }
3393
3394
3395 /* Why was the hash table entry size definition changed from
3396 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3397 this is the only reason for the s390_elf64_size_info structure. */
3398
3399 const struct elf_size_info s390_elf64_size_info =
3400 {
3401 sizeof (Elf64_External_Ehdr),
3402 sizeof (Elf64_External_Phdr),
3403 sizeof (Elf64_External_Shdr),
3404 sizeof (Elf64_External_Rel),
3405 sizeof (Elf64_External_Rela),
3406 sizeof (Elf64_External_Sym),
3407 sizeof (Elf64_External_Dyn),
3408 sizeof (Elf_External_Note),
3409 8, /* hash-table entry size. */
3410 1, /* internal relocations per external relocations. */
3411 64, /* arch_size. */
3412 3, /* log_file_align. */
3413 ELFCLASS64, EV_CURRENT,
3414 bfd_elf64_write_out_phdrs,
3415 bfd_elf64_write_shdrs_and_ehdr,
3416 bfd_elf64_write_relocs,
3417 bfd_elf64_swap_symbol_in,
3418 bfd_elf64_swap_symbol_out,
3419 bfd_elf64_slurp_reloc_table,
3420 bfd_elf64_slurp_symbol_table,
3421 bfd_elf64_swap_dyn_in,
3422 bfd_elf64_swap_dyn_out,
3423 bfd_elf64_swap_reloc_in,
3424 bfd_elf64_swap_reloc_out,
3425 bfd_elf64_swap_reloca_in,
3426 bfd_elf64_swap_reloca_out
3427 };
3428
3429 #define TARGET_BIG_SYM bfd_elf64_s390_vec
3430 #define TARGET_BIG_NAME "elf64-s390"
3431 #define ELF_ARCH bfd_arch_s390
3432 #define ELF_MACHINE_CODE EM_S390
3433 #define ELF_MACHINE_ALT1 EM_S390_OLD
3434 #define ELF_MAXPAGESIZE 0x1000
3435
3436 #define elf_backend_size_info s390_elf64_size_info
3437
3438 #define elf_backend_can_gc_sections 1
3439 #define elf_backend_can_refcount 1
3440 #define elf_backend_want_got_plt 1
3441 #define elf_backend_plt_readonly 1
3442 #define elf_backend_want_plt_sym 0
3443 #define elf_backend_got_header_size 24
3444 #define elf_backend_rela_normal 1
3445
3446 #define elf_info_to_howto elf_s390_info_to_howto
3447
3448 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3449 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3450 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3451 #define bfd_elf64_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
3452
3453 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3454 #define elf_backend_check_relocs elf_s390_check_relocs
3455 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3456 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3457 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3458 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3459 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3460 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3461 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3462 #define elf_backend_relocate_section elf_s390_relocate_section
3463 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3464 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3465 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3466 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3467
3468 #define bfd_elf64_mkobject elf_s390_mkobject
3469 #define elf_backend_object_p elf_s390_object_p
3470
3471 #include "elf64-target.h"
3472