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ELF: Consolidate readonly_dynrelocs
[deliverable/binutils-gdb.git] / bfd / elf32-s390.c
1 /* IBM S/390-specific support for 32-bit ELF
2 Copyright (C) 2000-2020 Free Software Foundation, Inc.
3 Contributed by Carl B. Pedersen and Martin Schwidefsky.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
20 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/s390.h"
28 #include <stdarg.h>
29
30 static bfd_reloc_status_type
31 s390_tls_reloc (bfd *, arelent *, asymbol *, void *,
32 asection *, bfd *, char **);
33 static bfd_reloc_status_type
34 s390_elf_ldisp_reloc (bfd *, arelent *, asymbol *, void *,
35 asection *, bfd *, char **);
36
37 /* The relocation "howto" table. */
38
39 static reloc_howto_type elf_howto_table[] =
40 {
41 HOWTO (R_390_NONE, /* type */
42 0, /* rightshift */
43 3, /* size (0 = byte, 1 = 2 byte, 2 = 4 byte) */
44 0, /* bitsize */
45 FALSE, /* pc_relative */
46 0, /* bitpos */
47 complain_overflow_dont, /* complain_on_overflow */
48 bfd_elf_generic_reloc, /* special_function */
49 "R_390_NONE", /* name */
50 FALSE, /* partial_inplace */
51 0, /* src_mask */
52 0, /* dst_mask */
53 FALSE), /* pcrel_offset */
54
55 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
57 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
58 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
59 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
61 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
63 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
65 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
67 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
68 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
69 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
71 HOWTO(R_390_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,0xffffffff, FALSE),
73 HOWTO(R_390_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
74 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,0xffffffff, FALSE),
75 HOWTO(R_390_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
76 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,0xffffffff, FALSE),
77 HOWTO(R_390_RELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
78 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,0xffffffff, FALSE),
79 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,0xffffffff, FALSE),
81 HOWTO(R_390_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
82 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,0xffffffff, TRUE),
83 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
85 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
87 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
89 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
91 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
93 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
95 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,0xffffffff, TRUE),
97 EMPTY_HOWTO (R_390_64), /* Empty entry for R_390_64. */
98 EMPTY_HOWTO (R_390_PC64), /* Empty entry for R_390_PC64. */
99 EMPTY_HOWTO (R_390_GOT64), /* Empty entry for R_390_GOT64. */
100 EMPTY_HOWTO (R_390_PLT64), /* Empty entry for R_390_PLT64. */
101 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,0xffffffff, TRUE),
103 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
104 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
105 EMPTY_HOWTO (R_390_GOTOFF64), /* Empty entry for R_390_GOTOFF64. */
106 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
107 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
108 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
110 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
112 EMPTY_HOWTO (R_390_GOTPLT64), /* Empty entry for R_390_GOTPLT64. */
113 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,0xffffffff, TRUE),
115 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
116 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
117 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
119 EMPTY_HOWTO (R_390_PLTOFF64), /* Empty entry for R_390_PLTOFF64. */
120 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont,
121 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE),
122 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
123 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE),
124 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
125 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE),
126 HOWTO(R_390_TLS_GD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_390_TLS_GD32", FALSE, 0, 0xffffffff, FALSE),
128 EMPTY_HOWTO (R_390_TLS_GD64), /* Empty entry for R_390_TLS_GD64. */
129 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
130 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE),
131 HOWTO(R_390_TLS_GOTIE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_390_TLS_GOTIE32", FALSE, 0, 0xffffffff, FALSE),
133 EMPTY_HOWTO (R_390_TLS_GOTIE64), /* Empty entry for R_390_TLS_GOTIE64. */
134 HOWTO(R_390_TLS_LDM32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
135 bfd_elf_generic_reloc, "R_390_TLS_LDM32", FALSE, 0, 0xffffffff, FALSE),
136 EMPTY_HOWTO (R_390_TLS_LDM64), /* Empty entry for R_390_TLS_LDM64. */
137 HOWTO(R_390_TLS_IE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_390_TLS_IE32", FALSE, 0, 0xffffffff, FALSE),
139 EMPTY_HOWTO (R_390_TLS_IE64), /* Empty entry for R_390_TLS_IE64. */
140 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, 0xffffffff, TRUE),
142 HOWTO(R_390_TLS_LE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
143 bfd_elf_generic_reloc, "R_390_TLS_LE32", FALSE, 0, 0xffffffff, FALSE),
144 EMPTY_HOWTO (R_390_TLS_LE64), /* Empty entry for R_390_TLS_LE64. */
145 HOWTO(R_390_TLS_LDO32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
146 bfd_elf_generic_reloc, "R_390_TLS_LDO32", FALSE, 0, 0xffffffff, FALSE),
147 EMPTY_HOWTO (R_390_TLS_LDO64), /* Empty entry for R_390_TLS_LDO64. */
148 HOWTO(R_390_TLS_DTPMOD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, 0xffffffff, FALSE),
150 HOWTO(R_390_TLS_DTPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, 0xffffffff, FALSE),
152 HOWTO(R_390_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
153 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, 0xffffffff, FALSE),
154 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
155 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE),
156 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
157 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE),
158 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
159 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE),
160 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
161 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE),
162 HOWTO(R_390_IRELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
163 bfd_elf_generic_reloc, "R_390_IRELATIVE", FALSE, 0, 0xffffffff, FALSE),
164 HOWTO(R_390_PC12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield,
165 bfd_elf_generic_reloc, "R_390_PC12DBL", FALSE, 0,0x00000fff, TRUE),
166 HOWTO(R_390_PLT12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield,
167 bfd_elf_generic_reloc, "R_390_PLT12DBL", FALSE, 0,0x00000fff, TRUE),
168 HOWTO(R_390_PC24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield,
169 bfd_elf_generic_reloc, "R_390_PC24DBL", FALSE, 0,0x00ffffff, TRUE),
170 HOWTO(R_390_PLT24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield,
171 bfd_elf_generic_reloc, "R_390_PLT24DBL", FALSE, 0,0x00ffffff, TRUE),
172 };
173
174 /* GNU extension to record C++ vtable hierarchy. */
175 static reloc_howto_type elf32_s390_vtinherit_howto =
176 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
177 static reloc_howto_type elf32_s390_vtentry_howto =
178 HOWTO (R_390_GNU_VTENTRY, 0,2,0,FALSE,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", FALSE,0,0, FALSE);
179
180 static reloc_howto_type *
181 elf_s390_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
182 bfd_reloc_code_real_type code)
183 {
184 switch (code)
185 {
186 case BFD_RELOC_NONE:
187 return &elf_howto_table[(int) R_390_NONE];
188 case BFD_RELOC_8:
189 return &elf_howto_table[(int) R_390_8];
190 case BFD_RELOC_390_12:
191 return &elf_howto_table[(int) R_390_12];
192 case BFD_RELOC_16:
193 return &elf_howto_table[(int) R_390_16];
194 case BFD_RELOC_32:
195 return &elf_howto_table[(int) R_390_32];
196 case BFD_RELOC_CTOR:
197 return &elf_howto_table[(int) R_390_32];
198 case BFD_RELOC_32_PCREL:
199 return &elf_howto_table[(int) R_390_PC32];
200 case BFD_RELOC_390_GOT12:
201 return &elf_howto_table[(int) R_390_GOT12];
202 case BFD_RELOC_32_GOT_PCREL:
203 return &elf_howto_table[(int) R_390_GOT32];
204 case BFD_RELOC_390_PLT32:
205 return &elf_howto_table[(int) R_390_PLT32];
206 case BFD_RELOC_390_COPY:
207 return &elf_howto_table[(int) R_390_COPY];
208 case BFD_RELOC_390_GLOB_DAT:
209 return &elf_howto_table[(int) R_390_GLOB_DAT];
210 case BFD_RELOC_390_JMP_SLOT:
211 return &elf_howto_table[(int) R_390_JMP_SLOT];
212 case BFD_RELOC_390_RELATIVE:
213 return &elf_howto_table[(int) R_390_RELATIVE];
214 case BFD_RELOC_32_GOTOFF:
215 return &elf_howto_table[(int) R_390_GOTOFF32];
216 case BFD_RELOC_390_GOTPC:
217 return &elf_howto_table[(int) R_390_GOTPC];
218 case BFD_RELOC_390_GOT16:
219 return &elf_howto_table[(int) R_390_GOT16];
220 case BFD_RELOC_16_PCREL:
221 return &elf_howto_table[(int) R_390_PC16];
222 case BFD_RELOC_390_PC12DBL:
223 return &elf_howto_table[(int) R_390_PC12DBL];
224 case BFD_RELOC_390_PLT12DBL:
225 return &elf_howto_table[(int) R_390_PLT12DBL];
226 case BFD_RELOC_390_PC16DBL:
227 return &elf_howto_table[(int) R_390_PC16DBL];
228 case BFD_RELOC_390_PLT16DBL:
229 return &elf_howto_table[(int) R_390_PLT16DBL];
230 case BFD_RELOC_390_PC24DBL:
231 return &elf_howto_table[(int) R_390_PC24DBL];
232 case BFD_RELOC_390_PLT24DBL:
233 return &elf_howto_table[(int) R_390_PLT24DBL];
234 case BFD_RELOC_390_PC32DBL:
235 return &elf_howto_table[(int) R_390_PC32DBL];
236 case BFD_RELOC_390_PLT32DBL:
237 return &elf_howto_table[(int) R_390_PLT32DBL];
238 case BFD_RELOC_390_GOTPCDBL:
239 return &elf_howto_table[(int) R_390_GOTPCDBL];
240 case BFD_RELOC_390_GOTENT:
241 return &elf_howto_table[(int) R_390_GOTENT];
242 case BFD_RELOC_16_GOTOFF:
243 return &elf_howto_table[(int) R_390_GOTOFF16];
244 case BFD_RELOC_390_GOTPLT12:
245 return &elf_howto_table[(int) R_390_GOTPLT12];
246 case BFD_RELOC_390_GOTPLT16:
247 return &elf_howto_table[(int) R_390_GOTPLT16];
248 case BFD_RELOC_390_GOTPLT32:
249 return &elf_howto_table[(int) R_390_GOTPLT32];
250 case BFD_RELOC_390_GOTPLTENT:
251 return &elf_howto_table[(int) R_390_GOTPLTENT];
252 case BFD_RELOC_390_PLTOFF16:
253 return &elf_howto_table[(int) R_390_PLTOFF16];
254 case BFD_RELOC_390_PLTOFF32:
255 return &elf_howto_table[(int) R_390_PLTOFF32];
256 case BFD_RELOC_390_TLS_LOAD:
257 return &elf_howto_table[(int) R_390_TLS_LOAD];
258 case BFD_RELOC_390_TLS_GDCALL:
259 return &elf_howto_table[(int) R_390_TLS_GDCALL];
260 case BFD_RELOC_390_TLS_LDCALL:
261 return &elf_howto_table[(int) R_390_TLS_LDCALL];
262 case BFD_RELOC_390_TLS_GD32:
263 return &elf_howto_table[(int) R_390_TLS_GD32];
264 case BFD_RELOC_390_TLS_GOTIE12:
265 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
266 case BFD_RELOC_390_TLS_GOTIE32:
267 return &elf_howto_table[(int) R_390_TLS_GOTIE32];
268 case BFD_RELOC_390_TLS_LDM32:
269 return &elf_howto_table[(int) R_390_TLS_LDM32];
270 case BFD_RELOC_390_TLS_IE32:
271 return &elf_howto_table[(int) R_390_TLS_IE32];
272 case BFD_RELOC_390_TLS_IEENT:
273 return &elf_howto_table[(int) R_390_TLS_IEENT];
274 case BFD_RELOC_390_TLS_LE32:
275 return &elf_howto_table[(int) R_390_TLS_LE32];
276 case BFD_RELOC_390_TLS_LDO32:
277 return &elf_howto_table[(int) R_390_TLS_LDO32];
278 case BFD_RELOC_390_TLS_DTPMOD:
279 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
280 case BFD_RELOC_390_TLS_DTPOFF:
281 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
282 case BFD_RELOC_390_TLS_TPOFF:
283 return &elf_howto_table[(int) R_390_TLS_TPOFF];
284 case BFD_RELOC_390_20:
285 return &elf_howto_table[(int) R_390_20];
286 case BFD_RELOC_390_GOT20:
287 return &elf_howto_table[(int) R_390_GOT20];
288 case BFD_RELOC_390_GOTPLT20:
289 return &elf_howto_table[(int) R_390_GOTPLT20];
290 case BFD_RELOC_390_TLS_GOTIE20:
291 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
292 case BFD_RELOC_390_IRELATIVE:
293 return &elf_howto_table[(int) R_390_IRELATIVE];
294 case BFD_RELOC_VTABLE_INHERIT:
295 return &elf32_s390_vtinherit_howto;
296 case BFD_RELOC_VTABLE_ENTRY:
297 return &elf32_s390_vtentry_howto;
298 default:
299 break;
300 }
301 return 0;
302 }
303
304 static reloc_howto_type *
305 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
306 const char *r_name)
307 {
308 unsigned int i;
309
310 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
311 if (elf_howto_table[i].name != NULL
312 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
313 return &elf_howto_table[i];
314
315 if (strcasecmp (elf32_s390_vtinherit_howto.name, r_name) == 0)
316 return &elf32_s390_vtinherit_howto;
317 if (strcasecmp (elf32_s390_vtentry_howto.name, r_name) == 0)
318 return &elf32_s390_vtentry_howto;
319
320 return NULL;
321 }
322
323 /* We need to use ELF32_R_TYPE so we have our own copy of this function,
324 and elf32-s390.c has its own copy. */
325
326 static bfd_boolean
327 elf_s390_info_to_howto (bfd *abfd,
328 arelent *cache_ptr,
329 Elf_Internal_Rela *dst)
330 {
331 unsigned int r_type = ELF32_R_TYPE(dst->r_info);
332
333 switch (r_type)
334 {
335 case R_390_GNU_VTINHERIT:
336 cache_ptr->howto = &elf32_s390_vtinherit_howto;
337 break;
338
339 case R_390_GNU_VTENTRY:
340 cache_ptr->howto = &elf32_s390_vtentry_howto;
341 break;
342
343 default:
344 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
345 {
346 /* xgettext:c-format */
347 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
348 abfd, r_type);
349 bfd_set_error (bfd_error_bad_value);
350 return FALSE;
351 }
352 cache_ptr->howto = &elf_howto_table[r_type];
353 }
354
355 return TRUE;
356 }
357
358 /* A relocation function which doesn't do anything. */
359 static bfd_reloc_status_type
360 s390_tls_reloc (bfd *abfd ATTRIBUTE_UNUSED,
361 arelent *reloc_entry,
362 asymbol *symbol ATTRIBUTE_UNUSED,
363 void * data ATTRIBUTE_UNUSED,
364 asection *input_section,
365 bfd *output_bfd,
366 char **error_message ATTRIBUTE_UNUSED)
367 {
368 if (output_bfd)
369 reloc_entry->address += input_section->output_offset;
370 return bfd_reloc_ok;
371 }
372
373 /* Handle the large displacement relocs. */
374 static bfd_reloc_status_type
375 s390_elf_ldisp_reloc (bfd *abfd ATTRIBUTE_UNUSED,
376 arelent *reloc_entry,
377 asymbol *symbol,
378 void * data ATTRIBUTE_UNUSED,
379 asection *input_section,
380 bfd *output_bfd,
381 char **error_message ATTRIBUTE_UNUSED)
382 {
383 reloc_howto_type *howto = reloc_entry->howto;
384 bfd_vma relocation;
385 bfd_vma insn;
386
387 if (output_bfd != (bfd *) NULL
388 && (symbol->flags & BSF_SECTION_SYM) == 0
389 && (! howto->partial_inplace
390 || reloc_entry->addend == 0))
391 {
392 reloc_entry->address += input_section->output_offset;
393 return bfd_reloc_ok;
394 }
395
396 if (output_bfd != NULL)
397 return bfd_reloc_continue;
398
399 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
400 return bfd_reloc_outofrange;
401
402 relocation = (symbol->value
403 + symbol->section->output_section->vma
404 + symbol->section->output_offset);
405 relocation += reloc_entry->addend;
406 if (howto->pc_relative)
407 {
408 relocation -= (input_section->output_section->vma
409 + input_section->output_offset);
410 relocation -= reloc_entry->address;
411 }
412
413 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
414 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
415 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
416
417 if ((bfd_signed_vma) relocation < - 0x80000
418 || (bfd_signed_vma) relocation > 0x7ffff)
419 return bfd_reloc_overflow;
420 else
421 return bfd_reloc_ok;
422 }
423
424 static bfd_boolean
425 elf_s390_is_local_label_name (bfd *abfd, const char *name)
426 {
427 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
428 return TRUE;
429
430 return _bfd_elf_is_local_label_name (abfd, name);
431 }
432
433 /* Functions for the 390 ELF linker. */
434
435 /* The name of the dynamic interpreter. This is put in the .interp
436 section. */
437
438 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1"
439
440 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
441 copying dynamic variables from a shared lib into an app's dynbss
442 section, and instead use a dynamic relocation to point into the
443 shared lib. */
444 #define ELIMINATE_COPY_RELOCS 1
445
446 /* The size in bytes of the first entry in the procedure linkage table. */
447 #define PLT_FIRST_ENTRY_SIZE 32
448 /* The size in bytes of an entry in the procedure linkage table. */
449 #define PLT_ENTRY_SIZE 32
450
451 #define GOT_ENTRY_SIZE 4
452
453 #define RELA_ENTRY_SIZE sizeof (Elf32_External_Rela)
454
455 /* The first three entries in a procedure linkage table are reserved,
456 and the initial contents are unimportant (we zero them out).
457 Subsequent entries look like this. See the SVR4 ABI 386
458 supplement to see how this works. */
459
460 /* For the s390, simple addr offset can only be 0 - 4096.
461 To use the full 2 GB address space, several instructions
462 are needed to load an address in a register and execute
463 a branch( or just saving the address)
464
465 Furthermore, only r 0 and 1 are free to use!!! */
466
467 /* The first 3 words in the GOT are then reserved.
468 Word 0 is the address of the dynamic table.
469 Word 1 is a pointer to a structure describing the object
470 Word 2 is used to point to the loader entry address.
471
472 The code for position independent PLT entries looks like this:
473
474 r12 holds addr of the current GOT at entry to the PLT
475
476 The GOT holds the address in the PLT to be executed.
477 The loader then gets:
478 24(15) = Pointer to the structure describing the object.
479 28(15) = Offset into rela.plt
480
481 The loader must then find the module where the function is
482 and insert the address in the GOT.
483
484 Note: 390 can only address +- 64 K relative.
485 We check if offset > 65536, then make a relative branch -64xxx
486 back to a previous defined branch
487
488 PLT1: BASR 1,0 # 2 bytes
489 L 1,22(1) # 4 bytes Load offset in GOT in r 1
490 L 1,(1,12) # 4 bytes Load address from GOT in r1
491 BCR 15,1 # 2 bytes Jump to address
492 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
493 L 1,14(1) # 4 bytes Load offset in symol table in r1
494 BRC 15,-x # 4 bytes Jump to start of PLT
495 .word 0 # 2 bytes filler
496 .long ? # 4 bytes offset in GOT
497 .long ? # 4 bytes offset into rela.plt
498
499 This was the general case. There are two additional, optimizes PLT
500 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768.
501 First the one for GOT offsets < 4096:
502
503 PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1
504 BCR 15,1 # 2 bytes Jump to address
505 .word 0,0,0 # 6 bytes filler
506 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
507 L 1,14(1) # 4 bytes Load offset in rela.plt in r1
508 BRC 15,-x # 4 bytes Jump to start of PLT
509 .word 0,0,0 # 6 bytes filler
510 .long ? # 4 bytes offset into rela.plt
511
512 Second the one for GOT offsets < 32768:
513
514 PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1
515 L 1,(1,12) # 4 bytes Load address from GOT to r1
516 BCR 15,1 # 2 bytes Jump to address
517 .word 0 # 2 bytes filler
518 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
519 L 1,14(1) # 4 bytes Load offset in rela.plt in r1
520 BRC 15,-x # 4 bytes Jump to start of PLT
521 .word 0,0,0 # 6 bytes filler
522 .long ? # 4 bytes offset into rela.plt
523
524 Total = 32 bytes per PLT entry
525
526 The code for static build PLT entries looks like this:
527
528 PLT1: BASR 1,0 # 2 bytes
529 L 1,22(1) # 4 bytes Load address of GOT entry
530 L 1,0(0,1) # 4 bytes Load address from GOT in r1
531 BCR 15,1 # 2 bytes Jump to address
532 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
533 L 1,14(1) # 4 bytes Load offset in symbol table in r1
534 BRC 15,-x # 4 bytes Jump to start of PLT
535 .word 0 # 2 bytes filler
536 .long ? # 4 bytes address of GOT entry
537 .long ? # 4 bytes offset into rela.plt */
538
539 static const bfd_byte elf_s390_plt_entry[PLT_ENTRY_SIZE] =
540 {
541 0x0d, 0x10, /* basr %r1,%r0 */
542 0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */
543 0x58, 0x10, 0x10, 0x00, /* l %r1,0(%r1) */
544 0x07, 0xf1, /* br %r1 */
545 0x0d, 0x10, /* basr %r1,%r0 */
546 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
547 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
548 0x00, 0x00, /* padding */
549 0x00, 0x00, 0x00, 0x00, /* GOT offset */
550 0x00, 0x00, 0x00, 0x00 /* rela.plt offset */
551 };
552
553 /* Generic PLT pic entry. */
554 static const bfd_byte elf_s390_plt_pic_entry[PLT_ENTRY_SIZE] =
555 {
556 0x0d, 0x10, /* basr %r1,%r0 */
557 0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */
558 0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */
559 0x07, 0xf1, /* br %r1 */
560 0x0d, 0x10, /* basr %r1,%r0 */
561 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
562 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
563 0x00, 0x00, /* padding */
564 0x00, 0x00, 0x00, 0x00, /* GOT offset */
565 0x00, 0x00, 0x00, 0x00 /* rela.plt offset */
566 };
567
568 /* Optimized PLT pic entry for GOT offset < 4k. xx will be replaced
569 when generating the PLT slot with the GOT offset. */
570 static const bfd_byte elf_s390_plt_pic12_entry[PLT_ENTRY_SIZE] =
571 {
572 0x58, 0x10, 0xc0, 0x00, /* l %r1,xx(%r12) */
573 0x07, 0xf1, /* br %r1 */
574 0x00, 0x00, 0x00, 0x00, /* padding */
575 0x00, 0x00,
576 0x0d, 0x10, /* basr %r1,%r0 */
577 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
578 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
579 0x00, 0x00, 0x00, 0x00,
580 0x00, 0x00, 0x00, 0x00
581 };
582
583 /* Optimized PLT pic entry for GOT offset < 32k. xx will be replaced
584 when generating the PLT slot with the GOT offset. */
585 static const bfd_byte elf_s390_plt_pic16_entry[PLT_ENTRY_SIZE] =
586 {
587 0xa7, 0x18, 0x00, 0x00, /* lhi %r1,xx */
588 0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */
589 0x07, 0xf1, /* br %r1 */
590 0x00, 0x00,
591 0x0d, 0x10, /* basr %r1,%r0 */
592 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
593 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
594 0x00, 0x00, 0x00, 0x00,
595 0x00, 0x00, 0x00, 0x00,
596 0x00, 0x00
597 };
598
599 /* The first PLT entry pushes the offset into the rela.plt
600 from R1 onto the stack at 8(15) and the loader object info
601 at 12(15), loads the loader address in R1 and jumps to it. */
602
603 /* The first entry in the PLT for PIC code:
604
605 PLT0:
606 ST 1,28(15) # R1 has offset into rela.plt
607 L 1,4(12) # Get loader ino(object struct address)
608 ST 1,24(15) # Store address
609 L 1,8(12) # Entry address of loader in R1
610 BR 1 # Jump to loader
611
612 The first entry in the PLT for static code:
613
614 PLT0:
615 ST 1,28(15) # R1 has offset into rela.plt
616 BASR 1,0
617 L 1,18(0,1) # Get address of GOT
618 MVC 24(4,15),4(1) # Move loader ino to stack
619 L 1,8(1) # Get address of loader
620 BR 1 # Jump to loader
621 .word 0 # filler
622 .long got # address of GOT */
623
624 static const bfd_byte elf_s390_plt_first_entry[PLT_FIRST_ENTRY_SIZE] =
625 {
626 0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */
627 0x0d, 0x10, /* basr %r1,%r0 */
628 0x58, 0x10, 0x10, 0x12, /* l %r1,18(%r1) */
629 0xd2, 0x03, 0xf0, 0x18, 0x10, 0x04, /* mvc 24(4,%r15),4(%r1) */
630 0x58, 0x10, 0x10, 0x08, /* l %r1,8(%r1) */
631 0x07, 0xf1, /* br %r1 */
632 0x00, 0x00, 0x00, 0x00,
633 0x00, 0x00, 0x00, 0x00,
634 0x00, 0x00
635 };
636
637 static const bfd_byte elf_s390_plt_pic_first_entry[PLT_FIRST_ENTRY_SIZE] =
638 {
639 0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */
640 0x58, 0x10, 0xc0, 0x04, /* l %r1,4(%r12) */
641 0x50, 0x10, 0xf0, 0x18, /* st %r1,24(%r15) */
642 0x58, 0x10, 0xc0, 0x08, /* l %r1,8(%r12) */
643 0x07, 0xf1, /* br %r1 */
644 0x00, 0x00, 0x00, 0x00,
645 0x00, 0x00, 0x00, 0x00,
646 0x00, 0x00, 0x00, 0x00,
647 0x00, 0x00
648 };
649
650
651 /* s390 ELF linker hash entry. */
652
653 struct elf_s390_link_hash_entry
654 {
655 struct elf_link_hash_entry elf;
656
657 /* Number of GOTPLT references for a function. */
658 bfd_signed_vma gotplt_refcount;
659
660 #define GOT_UNKNOWN 0
661 #define GOT_NORMAL 1
662 #define GOT_TLS_GD 2
663 #define GOT_TLS_IE 3
664 #define GOT_TLS_IE_NLT 4
665 unsigned char tls_type;
666
667 /* For pointer equality reasons we might need to change the symbol
668 type from STT_GNU_IFUNC to STT_FUNC together with its value and
669 section entry. So after alloc_dynrelocs only these values should
670 be used. In order to check whether a symbol is IFUNC use
671 s390_is_ifunc_symbol_p. */
672 bfd_vma ifunc_resolver_address;
673 asection *ifunc_resolver_section;
674 };
675
676 #define elf_s390_hash_entry(ent) \
677 ((struct elf_s390_link_hash_entry *)(ent))
678
679 /* This structure represents an entry in the local PLT list needed for
680 local IFUNC symbols. */
681 struct plt_entry
682 {
683 /* The section of the local symbol.
684 Set in relocate_section and used in finish_dynamic_sections. */
685 asection *sec;
686
687 union
688 {
689 bfd_signed_vma refcount;
690 bfd_vma offset;
691 } plt;
692 };
693
694 /* NOTE: Keep this structure in sync with
695 the one declared in elf64-s390.c. */
696 struct elf_s390_obj_tdata
697 {
698 struct elf_obj_tdata root;
699
700 /* A local PLT is needed for ifunc symbols. */
701 struct plt_entry *local_plt;
702
703 /* TLS type for each local got entry. */
704 char *local_got_tls_type;
705 };
706
707 #define elf_s390_tdata(abfd) \
708 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
709
710 #define elf_s390_local_plt(abfd) \
711 (elf_s390_tdata (abfd)->local_plt)
712
713 #define elf_s390_local_got_tls_type(abfd) \
714 (elf_s390_tdata (abfd)->local_got_tls_type)
715
716 #define is_s390_elf(bfd) \
717 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
718 && elf_tdata (bfd) != NULL \
719 && elf_object_id (bfd) == S390_ELF_DATA)
720
721 static bfd_boolean
722 elf_s390_mkobject (bfd *abfd)
723 {
724 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata),
725 S390_ELF_DATA);
726 }
727
728 static bfd_boolean
729 elf_s390_object_p (bfd *abfd)
730 {
731 /* Set the right machine number for an s390 elf32 file. */
732 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31);
733 }
734
735 /* s390 ELF linker hash table. */
736
737 struct elf_s390_link_hash_table
738 {
739 struct elf_link_hash_table elf;
740
741 /* Short-cuts to get to dynamic linker sections. */
742 asection *irelifunc;
743
744 union
745 {
746 bfd_signed_vma refcount;
747 bfd_vma offset;
748 } tls_ldm_got;
749
750 /* Small local sym cache. */
751 struct sym_cache sym_cache;
752 };
753
754 /* Get the s390 ELF linker hash table from a link_info structure. */
755
756 #define elf_s390_hash_table(p) \
757 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
758 == S390_ELF_DATA ? ((struct elf_s390_link_hash_table *) ((p)->hash)) : NULL)
759
760 #undef ELF64
761 #include "elf-s390-common.c"
762
763 /* Create an entry in an s390 ELF linker hash table. */
764
765 static struct bfd_hash_entry *
766 link_hash_newfunc (struct bfd_hash_entry *entry,
767 struct bfd_hash_table *table,
768 const char *string)
769 {
770 /* Allocate the structure if it has not already been allocated by a
771 subclass. */
772 if (entry == NULL)
773 {
774 entry = bfd_hash_allocate (table,
775 sizeof (struct elf_s390_link_hash_entry));
776 if (entry == NULL)
777 return entry;
778 }
779
780 /* Call the allocation method of the superclass. */
781 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
782 if (entry != NULL)
783 {
784 struct elf_s390_link_hash_entry *eh;
785
786 eh = (struct elf_s390_link_hash_entry *) entry;
787 eh->gotplt_refcount = 0;
788 eh->tls_type = GOT_UNKNOWN;
789 eh->ifunc_resolver_address = 0;
790 eh->ifunc_resolver_section = NULL;
791 }
792
793 return entry;
794 }
795
796 /* Create an s390 ELF linker hash table. */
797
798 static struct bfd_link_hash_table *
799 elf_s390_link_hash_table_create (bfd *abfd)
800 {
801 struct elf_s390_link_hash_table *ret;
802 size_t amt = sizeof (struct elf_s390_link_hash_table);
803
804 ret = (struct elf_s390_link_hash_table *) bfd_zmalloc (amt);
805 if (ret == NULL)
806 return NULL;
807
808 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
809 sizeof (struct elf_s390_link_hash_entry),
810 S390_ELF_DATA))
811 {
812 free (ret);
813 return NULL;
814 }
815
816 return &ret->elf.root;
817 }
818
819 /* Copy the extra info we tack onto an elf_link_hash_entry. */
820
821 static void
822 elf_s390_copy_indirect_symbol (struct bfd_link_info *info,
823 struct elf_link_hash_entry *dir,
824 struct elf_link_hash_entry *ind)
825 {
826 struct elf_s390_link_hash_entry *edir, *eind;
827
828 edir = (struct elf_s390_link_hash_entry *) dir;
829 eind = (struct elf_s390_link_hash_entry *) ind;
830
831 if (ind->dyn_relocs != NULL)
832 {
833 if (dir->dyn_relocs != NULL)
834 {
835 struct elf_dyn_relocs **pp;
836 struct elf_dyn_relocs *p;
837
838 /* Add reloc counts against the indirect sym to the direct sym
839 list. Merge any entries against the same section. */
840 for (pp = &ind->dyn_relocs; (p = *pp) != NULL; )
841 {
842 struct elf_dyn_relocs *q;
843
844 for (q = dir->dyn_relocs; q != NULL; q = q->next)
845 if (q->sec == p->sec)
846 {
847 q->pc_count += p->pc_count;
848 q->count += p->count;
849 *pp = p->next;
850 break;
851 }
852 if (q == NULL)
853 pp = &p->next;
854 }
855 *pp = dir->dyn_relocs;
856 }
857
858 dir->dyn_relocs = ind->dyn_relocs;
859 ind->dyn_relocs = NULL;
860 }
861
862 if (ind->root.type == bfd_link_hash_indirect
863 && dir->got.refcount <= 0)
864 {
865 edir->tls_type = eind->tls_type;
866 eind->tls_type = GOT_UNKNOWN;
867 }
868
869 if (ELIMINATE_COPY_RELOCS
870 && ind->root.type != bfd_link_hash_indirect
871 && dir->dynamic_adjusted)
872 {
873 /* If called to transfer flags for a weakdef during processing
874 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
875 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
876 if (dir->versioned != versioned_hidden)
877 dir->ref_dynamic |= ind->ref_dynamic;
878 dir->ref_regular |= ind->ref_regular;
879 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
880 dir->needs_plt |= ind->needs_plt;
881 }
882 else
883 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
884 }
885
886 static int
887 elf_s390_tls_transition (struct bfd_link_info *info,
888 int r_type,
889 int is_local)
890 {
891 if (bfd_link_pic (info))
892 return r_type;
893
894 switch (r_type)
895 {
896 case R_390_TLS_GD32:
897 case R_390_TLS_IE32:
898 if (is_local)
899 return R_390_TLS_LE32;
900 return R_390_TLS_IE32;
901 case R_390_TLS_GOTIE32:
902 if (is_local)
903 return R_390_TLS_LE32;
904 return R_390_TLS_GOTIE32;
905 case R_390_TLS_LDM32:
906 return R_390_TLS_LE32;
907 }
908
909 return r_type;
910 }
911
912 /* Look through the relocs for a section during the first phase, and
913 allocate space in the global offset table or procedure linkage
914 table. */
915
916 static bfd_boolean
917 elf_s390_check_relocs (bfd *abfd,
918 struct bfd_link_info *info,
919 asection *sec,
920 const Elf_Internal_Rela *relocs)
921 {
922 struct elf_s390_link_hash_table *htab;
923 Elf_Internal_Shdr *symtab_hdr;
924 struct elf_link_hash_entry **sym_hashes;
925 const Elf_Internal_Rela *rel;
926 const Elf_Internal_Rela *rel_end;
927 asection *sreloc;
928 bfd_signed_vma *local_got_refcounts;
929 int tls_type, old_tls_type;
930 Elf_Internal_Sym *isym;
931
932 if (bfd_link_relocatable (info))
933 return TRUE;
934
935 BFD_ASSERT (is_s390_elf (abfd));
936
937 htab = elf_s390_hash_table (info);
938 symtab_hdr = &elf_symtab_hdr (abfd);
939 sym_hashes = elf_sym_hashes (abfd);
940 local_got_refcounts = elf_local_got_refcounts (abfd);
941
942 sreloc = NULL;
943
944 rel_end = relocs + sec->reloc_count;
945 for (rel = relocs; rel < rel_end; rel++)
946 {
947 unsigned int r_type;
948 unsigned int r_symndx;
949 struct elf_link_hash_entry *h;
950
951 r_symndx = ELF32_R_SYM (rel->r_info);
952
953 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
954 {
955 /* xgettext:c-format */
956 _bfd_error_handler (_("%pB: bad symbol index: %d"),
957 abfd, r_symndx);
958 return FALSE;
959 }
960
961 if (r_symndx < symtab_hdr->sh_info)
962 {
963 /* A local symbol. */
964 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
965 abfd, r_symndx);
966 if (isym == NULL)
967 return FALSE;
968
969 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
970 {
971 struct plt_entry *plt;
972
973 if (htab->elf.dynobj == NULL)
974 htab->elf.dynobj = abfd;
975
976 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
977 return FALSE;
978
979 if (local_got_refcounts == NULL)
980 {
981 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
982 return FALSE;
983 local_got_refcounts = elf_local_got_refcounts (abfd);
984 }
985 plt = elf_s390_local_plt (abfd);
986 plt[r_symndx].plt.refcount++;
987 }
988 h = NULL;
989 }
990 else
991 {
992 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
993 while (h->root.type == bfd_link_hash_indirect
994 || h->root.type == bfd_link_hash_warning)
995 h = (struct elf_link_hash_entry *) h->root.u.i.link;
996 }
997
998 /* Create got section and local_got_refcounts array if they
999 are needed. */
1000 r_type = elf_s390_tls_transition (info,
1001 ELF32_R_TYPE (rel->r_info),
1002 h == NULL);
1003 switch (r_type)
1004 {
1005 case R_390_GOT12:
1006 case R_390_GOT16:
1007 case R_390_GOT20:
1008 case R_390_GOT32:
1009 case R_390_GOTENT:
1010 case R_390_GOTPLT12:
1011 case R_390_GOTPLT16:
1012 case R_390_GOTPLT20:
1013 case R_390_GOTPLT32:
1014 case R_390_GOTPLTENT:
1015 case R_390_TLS_GD32:
1016 case R_390_TLS_GOTIE12:
1017 case R_390_TLS_GOTIE20:
1018 case R_390_TLS_GOTIE32:
1019 case R_390_TLS_IEENT:
1020 case R_390_TLS_IE32:
1021 case R_390_TLS_LDM32:
1022 if (h == NULL
1023 && local_got_refcounts == NULL)
1024 {
1025 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
1026 return FALSE;
1027 local_got_refcounts = elf_local_got_refcounts (abfd);
1028 }
1029 /* Fall through. */
1030 case R_390_GOTOFF16:
1031 case R_390_GOTOFF32:
1032 case R_390_GOTPC:
1033 case R_390_GOTPCDBL:
1034 if (htab->elf.sgot == NULL)
1035 {
1036 if (htab->elf.dynobj == NULL)
1037 htab->elf.dynobj = abfd;
1038 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1039 return FALSE;
1040 }
1041 }
1042
1043 if (h != NULL)
1044 {
1045 if (htab->elf.dynobj == NULL)
1046 htab->elf.dynobj = abfd;
1047 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
1048 return FALSE;
1049
1050 /* Make sure an IFUNC symbol defined in a non-shared object
1051 always gets a PLT slot. */
1052 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1053 {
1054 /* The symbol is called by the dynamic loader in order
1055 to resolve the relocation. So it is in fact also
1056 referenced. */
1057 h->ref_regular = 1;
1058 h->needs_plt = 1;
1059 }
1060 }
1061 switch (r_type)
1062 {
1063 case R_390_GOTPC:
1064 case R_390_GOTPCDBL:
1065 /* These relocs do not need a GOT slot. They just load the
1066 GOT pointer itself or address something else relative to
1067 the GOT. Since the GOT pointer has been set up above we
1068 are done. */
1069 break;
1070 case R_390_GOTOFF16:
1071 case R_390_GOTOFF32:
1072 if (h == NULL || !s390_is_ifunc_symbol_p (h) || !h->def_regular)
1073 break;
1074 /* Fall through. */
1075
1076 case R_390_PLT12DBL:
1077 case R_390_PLT16DBL:
1078 case R_390_PLT24DBL:
1079 case R_390_PLT32DBL:
1080 case R_390_PLT32:
1081 case R_390_PLTOFF16:
1082 case R_390_PLTOFF32:
1083 /* This symbol requires a procedure linkage table entry. We
1084 actually build the entry in adjust_dynamic_symbol,
1085 because this might be a case of linking PIC code which is
1086 never referenced by a dynamic object, in which case we
1087 don't need to generate a procedure linkage table entry
1088 after all. */
1089
1090 /* If this is a local symbol, we resolve it directly without
1091 creating a procedure linkage table entry. */
1092 if (h != NULL)
1093 {
1094 h->needs_plt = 1;
1095 h->plt.refcount += 1;
1096 }
1097 break;
1098
1099 case R_390_GOTPLT12:
1100 case R_390_GOTPLT16:
1101 case R_390_GOTPLT20:
1102 case R_390_GOTPLT32:
1103 case R_390_GOTPLTENT:
1104 /* This symbol requires either a procedure linkage table entry
1105 or an entry in the local got. We actually build the entry
1106 in adjust_dynamic_symbol because whether this is really a
1107 global reference can change and with it the fact if we have
1108 to create a plt entry or a local got entry. To be able to
1109 make a once global symbol a local one we have to keep track
1110 of the number of gotplt references that exist for this
1111 symbol. */
1112 if (h != NULL)
1113 {
1114 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1115 h->needs_plt = 1;
1116 h->plt.refcount += 1;
1117 }
1118 else
1119 local_got_refcounts[r_symndx] += 1;
1120 break;
1121
1122 case R_390_TLS_LDM32:
1123 htab->tls_ldm_got.refcount += 1;
1124 break;
1125
1126 case R_390_TLS_IE32:
1127 case R_390_TLS_GOTIE12:
1128 case R_390_TLS_GOTIE20:
1129 case R_390_TLS_GOTIE32:
1130 case R_390_TLS_IEENT:
1131 if (bfd_link_pic (info))
1132 info->flags |= DF_STATIC_TLS;
1133 /* Fall through. */
1134
1135 case R_390_GOT12:
1136 case R_390_GOT16:
1137 case R_390_GOT20:
1138 case R_390_GOT32:
1139 case R_390_GOTENT:
1140 case R_390_TLS_GD32:
1141 /* This symbol requires a global offset table entry. */
1142 switch (r_type)
1143 {
1144 default:
1145 case R_390_GOT12:
1146 case R_390_GOT16:
1147 case R_390_GOT20:
1148 case R_390_GOT32:
1149 case R_390_GOTENT:
1150 tls_type = GOT_NORMAL;
1151 break;
1152 case R_390_TLS_GD32:
1153 tls_type = GOT_TLS_GD;
1154 break;
1155 case R_390_TLS_IE32:
1156 case R_390_TLS_GOTIE32:
1157 tls_type = GOT_TLS_IE;
1158 break;
1159 case R_390_TLS_GOTIE12:
1160 case R_390_TLS_GOTIE20:
1161 case R_390_TLS_IEENT:
1162 tls_type = GOT_TLS_IE_NLT;
1163 break;
1164 }
1165
1166 if (h != NULL)
1167 {
1168 h->got.refcount += 1;
1169 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1170 }
1171 else
1172 {
1173 local_got_refcounts[r_symndx] += 1;
1174 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1175 }
1176 /* If a TLS symbol is accessed using IE at least once,
1177 there is no point to use dynamic model for it. */
1178 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1179 {
1180 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1181 {
1182 _bfd_error_handler
1183 /* xgettext:c-format */
1184 (_("%pB: `%s' accessed both as normal and thread local symbol"),
1185 abfd, h->root.root.string);
1186 return FALSE;
1187 }
1188 if (old_tls_type > tls_type)
1189 tls_type = old_tls_type;
1190 }
1191
1192 if (old_tls_type != tls_type)
1193 {
1194 if (h != NULL)
1195 elf_s390_hash_entry (h)->tls_type = tls_type;
1196 else
1197 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1198 }
1199
1200 if (r_type != R_390_TLS_IE32)
1201 break;
1202 /* Fall through. */
1203
1204 case R_390_TLS_LE32:
1205 /* For static linking and executables this reloc will be
1206 calculated at linktime otherwise a TLS_TPOFF runtime
1207 reloc will be generated. */
1208 if (r_type == R_390_TLS_LE32 && bfd_link_pie (info))
1209 break;
1210
1211 if (!bfd_link_pic (info))
1212 break;
1213 info->flags |= DF_STATIC_TLS;
1214 /* Fall through. */
1215
1216 case R_390_8:
1217 case R_390_16:
1218 case R_390_32:
1219 case R_390_PC16:
1220 case R_390_PC12DBL:
1221 case R_390_PC16DBL:
1222 case R_390_PC24DBL:
1223 case R_390_PC32DBL:
1224 case R_390_PC32:
1225 if (h != NULL && bfd_link_executable (info))
1226 {
1227 /* If this reloc is in a read-only section, we might
1228 need a copy reloc. We can't check reliably at this
1229 stage whether the section is read-only, as input
1230 sections have not yet been mapped to output sections.
1231 Tentatively set the flag for now, and correct in
1232 adjust_dynamic_symbol. */
1233 h->non_got_ref = 1;
1234
1235 if (!bfd_link_pic (info))
1236 {
1237 /* We may need a .plt entry if the function this reloc
1238 refers to is in a shared lib. */
1239 h->plt.refcount += 1;
1240 }
1241 }
1242
1243 /* If we are creating a shared library, and this is a reloc
1244 against a global symbol, or a non PC relative reloc
1245 against a local symbol, then we need to copy the reloc
1246 into the shared library. However, if we are linking with
1247 -Bsymbolic, we do not need to copy a reloc against a
1248 global symbol which is defined in an object we are
1249 including in the link (i.e., DEF_REGULAR is set). At
1250 this point we have not seen all the input files, so it is
1251 possible that DEF_REGULAR is not set now but will be set
1252 later (it is never cleared). In case of a weak definition,
1253 DEF_REGULAR may be cleared later by a strong definition in
1254 a shared library. We account for that possibility below by
1255 storing information in the relocs_copied field of the hash
1256 table entry. A similar situation occurs when creating
1257 shared libraries and symbol visibility changes render the
1258 symbol local.
1259
1260 If on the other hand, we are creating an executable, we
1261 may need to keep relocations for symbols satisfied by a
1262 dynamic library if we manage to avoid copy relocs for the
1263 symbol. */
1264 if ((bfd_link_pic (info)
1265 && (sec->flags & SEC_ALLOC) != 0
1266 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16
1267 && ELF32_R_TYPE (rel->r_info) != R_390_PC12DBL
1268 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL
1269 && ELF32_R_TYPE (rel->r_info) != R_390_PC24DBL
1270 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL
1271 && ELF32_R_TYPE (rel->r_info) != R_390_PC32)
1272 || (h != NULL
1273 && (! SYMBOLIC_BIND (info, h)
1274 || h->root.type == bfd_link_hash_defweak
1275 || !h->def_regular))))
1276 || (ELIMINATE_COPY_RELOCS
1277 && !bfd_link_pic (info)
1278 && (sec->flags & SEC_ALLOC) != 0
1279 && h != NULL
1280 && (h->root.type == bfd_link_hash_defweak
1281 || !h->def_regular)))
1282 {
1283 struct elf_dyn_relocs *p;
1284 struct elf_dyn_relocs **head;
1285
1286 /* We must copy these reloc types into the output file.
1287 Create a reloc section in dynobj and make room for
1288 this reloc. */
1289 if (sreloc == NULL)
1290 {
1291 if (htab->elf.dynobj == NULL)
1292 htab->elf.dynobj = abfd;
1293
1294 sreloc = _bfd_elf_make_dynamic_reloc_section
1295 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ TRUE);
1296
1297 if (sreloc == NULL)
1298 return FALSE;
1299 }
1300
1301 /* If this is a global symbol, we count the number of
1302 relocations we need for this symbol. */
1303 if (h != NULL)
1304 {
1305 head = &h->dyn_relocs;
1306 }
1307 else
1308 {
1309 /* Track dynamic relocs needed for local syms too.
1310 We really need local syms available to do this
1311 easily. Oh well. */
1312 asection *s;
1313 void *vpp;
1314
1315 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1316 abfd, r_symndx);
1317 if (isym == NULL)
1318 return FALSE;
1319
1320 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1321 if (s == NULL)
1322 s = sec;
1323
1324 vpp = &elf_section_data (s)->local_dynrel;
1325 head = (struct elf_dyn_relocs **) vpp;
1326 }
1327
1328 p = *head;
1329 if (p == NULL || p->sec != sec)
1330 {
1331 size_t amt = sizeof *p;
1332
1333 p = ((struct elf_dyn_relocs *)
1334 bfd_alloc (htab->elf.dynobj, amt));
1335 if (p == NULL)
1336 return FALSE;
1337 p->next = *head;
1338 *head = p;
1339 p->sec = sec;
1340 p->count = 0;
1341 p->pc_count = 0;
1342 }
1343
1344 p->count += 1;
1345 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
1346 || ELF32_R_TYPE (rel->r_info) == R_390_PC12DBL
1347 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
1348 || ELF32_R_TYPE (rel->r_info) == R_390_PC24DBL
1349 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
1350 || ELF32_R_TYPE (rel->r_info) == R_390_PC32)
1351 p->pc_count += 1;
1352 }
1353 break;
1354
1355 /* This relocation describes the C++ object vtable hierarchy.
1356 Reconstruct it for later use during GC. */
1357 case R_390_GNU_VTINHERIT:
1358 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1359 return FALSE;
1360 break;
1361
1362 /* This relocation describes which C++ vtable entries are actually
1363 used. Record for later use during GC. */
1364 case R_390_GNU_VTENTRY:
1365 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1366 return FALSE;
1367 break;
1368
1369 default:
1370 break;
1371 }
1372 }
1373
1374 return TRUE;
1375 }
1376
1377 /* Return the section that should be marked against GC for a given
1378 relocation. */
1379
1380 static asection *
1381 elf_s390_gc_mark_hook (asection *sec,
1382 struct bfd_link_info *info,
1383 Elf_Internal_Rela *rel,
1384 struct elf_link_hash_entry *h,
1385 Elf_Internal_Sym *sym)
1386 {
1387 if (h != NULL)
1388 switch (ELF32_R_TYPE (rel->r_info))
1389 {
1390 case R_390_GNU_VTINHERIT:
1391 case R_390_GNU_VTENTRY:
1392 return NULL;
1393 }
1394 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1395
1396 }
1397
1398 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1399 entry but we found we will not create any. Called when we find we will
1400 not have any PLT for this symbol, by for example
1401 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1402 or elf_s390_size_dynamic_sections if no dynamic sections will be
1403 created (we're only linking static objects). */
1404
1405 static void
1406 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h)
1407 {
1408 if (h->elf.root.type == bfd_link_hash_warning)
1409 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1410
1411 if (h->gotplt_refcount <= 0)
1412 return;
1413
1414 /* We simply add the number of gotplt references to the number
1415 * of got references for this symbol. */
1416 h->elf.got.refcount += h->gotplt_refcount;
1417 h->gotplt_refcount = -1;
1418 }
1419
1420 /* Adjust a symbol defined by a dynamic object and referenced by a
1421 regular object. The current definition is in some section of the
1422 dynamic object, but we're not including those sections. We have to
1423 change the definition to something the rest of the link can
1424 understand. */
1425
1426 static bfd_boolean
1427 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
1428 struct elf_link_hash_entry *h)
1429 {
1430 struct elf_s390_link_hash_table *htab;
1431 asection *s, *srel;
1432
1433 /* STT_GNU_IFUNC symbol must go through PLT. */
1434 if (s390_is_ifunc_symbol_p (h))
1435 {
1436 /* All local STT_GNU_IFUNC references must be treated as local
1437 calls via local PLT. */
1438 if (h->ref_regular && SYMBOL_CALLS_LOCAL (info, h))
1439 {
1440 bfd_size_type pc_count = 0, count = 0;
1441 struct elf_dyn_relocs **pp;
1442 struct elf_dyn_relocs *p;
1443
1444 for (pp = &h->dyn_relocs; (p = *pp) != NULL; )
1445 {
1446 pc_count += p->pc_count;
1447 p->count -= p->pc_count;
1448 p->pc_count = 0;
1449 count += p->count;
1450 if (p->count == 0)
1451 *pp = p->next;
1452 else
1453 pp = &p->next;
1454 }
1455
1456 if (pc_count || count)
1457 {
1458 h->needs_plt = 1;
1459 h->non_got_ref = 1;
1460 if (h->plt.refcount <= 0)
1461 h->plt.refcount = 1;
1462 else
1463 h->plt.refcount += 1;
1464 }
1465 }
1466
1467 if (h->plt.refcount <= 0)
1468 {
1469 h->plt.offset = (bfd_vma) -1;
1470 h->needs_plt = 0;
1471 }
1472 return TRUE;
1473 }
1474
1475 /* If this is a function, put it in the procedure linkage table. We
1476 will fill in the contents of the procedure linkage table later
1477 (although we could actually do it here). */
1478 if (h->type == STT_FUNC
1479 || h->needs_plt)
1480 {
1481 if (h->plt.refcount <= 0
1482 || SYMBOL_CALLS_LOCAL (info, h)
1483 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1484 && h->root.type != bfd_link_hash_undefweak))
1485 {
1486 /* This case can occur if we saw a PLT32 reloc in an input
1487 file, but the symbol was never referred to by a dynamic
1488 object, or if all references were garbage collected. In
1489 such a case, we don't actually need to build a procedure
1490 linkage table, and we can just do a PC32 reloc instead. */
1491 h->plt.offset = (bfd_vma) -1;
1492 h->needs_plt = 0;
1493 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1494 }
1495
1496 return TRUE;
1497 }
1498 else
1499 /* It's possible that we incorrectly decided a .plt reloc was
1500 needed for an R_390_PC32 reloc to a non-function sym in
1501 check_relocs. We can't decide accurately between function and
1502 non-function syms in check-relocs; Objects loaded later in
1503 the link may change h->type. So fix it now. */
1504 h->plt.offset = (bfd_vma) -1;
1505
1506 /* If this is a weak symbol, and there is a real definition, the
1507 processor independent code will have arranged for us to see the
1508 real definition first, and we can just use the same value. */
1509 if (h->is_weakalias)
1510 {
1511 struct elf_link_hash_entry *def = weakdef (h);
1512 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
1513 h->root.u.def.section = def->root.u.def.section;
1514 h->root.u.def.value = def->root.u.def.value;
1515 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1516 h->non_got_ref = def->non_got_ref;
1517 return TRUE;
1518 }
1519
1520 /* This is a reference to a symbol defined by a dynamic object which
1521 is not a function. */
1522
1523 /* If we are creating a shared library, we must presume that the
1524 only references to the symbol are via the global offset table.
1525 For such cases we need not do anything here; the relocations will
1526 be handled correctly by relocate_section. */
1527 if (bfd_link_pic (info))
1528 return TRUE;
1529
1530 /* If there are no references to this symbol that do not use the
1531 GOT, we don't need to generate a copy reloc. */
1532 if (!h->non_got_ref)
1533 return TRUE;
1534
1535 /* If -z nocopyreloc was given, we won't generate them either. */
1536 if (info->nocopyreloc)
1537 {
1538 h->non_got_ref = 0;
1539 return TRUE;
1540 }
1541
1542 /* If we don't find any dynamic relocs in read-only sections, then
1543 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1544 if (ELIMINATE_COPY_RELOCS && !_bfd_elf_readonly_dynrelocs (h))
1545 {
1546 h->non_got_ref = 0;
1547 return TRUE;
1548 }
1549
1550 /* We must allocate the symbol in our .dynbss section, which will
1551 become part of the .bss section of the executable. There will be
1552 an entry for this symbol in the .dynsym section. The dynamic
1553 object will contain position independent code, so all references
1554 from the dynamic object to this symbol will go through the global
1555 offset table. The dynamic linker will use the .dynsym entry to
1556 determine the address it must put in the global offset table, so
1557 both the dynamic object and the regular object will refer to the
1558 same memory location for the variable. */
1559
1560 htab = elf_s390_hash_table (info);
1561
1562 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1563 copy the initial value out of the dynamic object and into the
1564 runtime process image. */
1565 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
1566 {
1567 s = htab->elf.sdynrelro;
1568 srel = htab->elf.sreldynrelro;
1569 }
1570 else
1571 {
1572 s = htab->elf.sdynbss;
1573 srel = htab->elf.srelbss;
1574 }
1575 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1576 {
1577 srel->size += sizeof (Elf32_External_Rela);
1578 h->needs_copy = 1;
1579 }
1580
1581 return _bfd_elf_adjust_dynamic_copy (info, h, s);
1582 }
1583
1584 /* Allocate space in .plt, .got and associated reloc sections for
1585 dynamic relocs. */
1586
1587 static bfd_boolean
1588 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1589 {
1590 struct bfd_link_info *info;
1591 struct elf_s390_link_hash_table *htab;
1592 struct elf_dyn_relocs *p;
1593
1594 if (h->root.type == bfd_link_hash_indirect)
1595 return TRUE;
1596
1597 info = (struct bfd_link_info *) inf;
1598 htab = elf_s390_hash_table (info);
1599
1600 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1601 here if it is defined and referenced in a non-shared object. */
1602 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1603 return s390_elf_allocate_ifunc_dyn_relocs (info, h);
1604 else if (htab->elf.dynamic_sections_created
1605 && h->plt.refcount > 0)
1606 {
1607 /* Make sure this symbol is output as a dynamic symbol.
1608 Undefined weak syms won't yet be marked as dynamic. */
1609 if (h->dynindx == -1
1610 && !h->forced_local)
1611 {
1612 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1613 return FALSE;
1614 }
1615
1616 if (bfd_link_pic (info)
1617 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1618 {
1619 asection *s = htab->elf.splt;
1620
1621 /* If this is the first .plt entry, make room for the special
1622 first entry. */
1623 if (s->size == 0)
1624 s->size += PLT_FIRST_ENTRY_SIZE;
1625
1626 h->plt.offset = s->size;
1627
1628 /* If this symbol is not defined in a regular file, and we are
1629 not generating a shared library, then set the symbol to this
1630 location in the .plt. This is required to make function
1631 pointers compare as equal between the normal executable and
1632 the shared library. */
1633 if (! bfd_link_pic (info)
1634 && !h->def_regular)
1635 {
1636 h->root.u.def.section = s;
1637 h->root.u.def.value = h->plt.offset;
1638 }
1639
1640 /* Make room for this entry. */
1641 s->size += PLT_ENTRY_SIZE;
1642
1643 /* We also need to make an entry in the .got.plt section, which
1644 will be placed in the .got section by the linker script. */
1645 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1646
1647 /* We also need to make an entry in the .rela.plt section. */
1648 htab->elf.srelplt->size += sizeof (Elf32_External_Rela);
1649 }
1650 else
1651 {
1652 h->plt.offset = (bfd_vma) -1;
1653 h->needs_plt = 0;
1654 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1655 }
1656 }
1657 else
1658 {
1659 h->plt.offset = (bfd_vma) -1;
1660 h->needs_plt = 0;
1661 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1662 }
1663
1664 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to
1665 the binary, we can optimize a bit. IE32 and GOTIE32 get converted
1666 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT
1667 we can save the dynamic TLS relocation. */
1668 if (h->got.refcount > 0
1669 && !bfd_link_pic (info)
1670 && h->dynindx == -1
1671 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1672 {
1673 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1674 /* For the GOTIE access without a literal pool entry the offset has
1675 to be stored somewhere. The immediate value in the instruction
1676 is not bit enough so the value is stored in the got. */
1677 {
1678 h->got.offset = htab->elf.sgot->size;
1679 htab->elf.sgot->size += GOT_ENTRY_SIZE;
1680 }
1681 else
1682 h->got.offset = (bfd_vma) -1;
1683 }
1684 else if (h->got.refcount > 0)
1685 {
1686 asection *s;
1687 bfd_boolean dyn;
1688 int tls_type = elf_s390_hash_entry(h)->tls_type;
1689
1690 /* Make sure this symbol is output as a dynamic symbol.
1691 Undefined weak syms won't yet be marked as dynamic. */
1692 if (h->dynindx == -1
1693 && !h->forced_local)
1694 {
1695 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1696 return FALSE;
1697 }
1698
1699 s = htab->elf.sgot;
1700 h->got.offset = s->size;
1701 s->size += GOT_ENTRY_SIZE;
1702 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */
1703 if (tls_type == GOT_TLS_GD)
1704 s->size += GOT_ENTRY_SIZE;
1705 dyn = htab->elf.dynamic_sections_created;
1706 /* R_390_TLS_IE32 needs one dynamic relocation,
1707 R_390_TLS_GD32 needs one if local symbol and two if global. */
1708 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1709 || tls_type >= GOT_TLS_IE)
1710 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1711 else if (tls_type == GOT_TLS_GD)
1712 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rela);
1713 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1714 || h->root.type != bfd_link_hash_undefweak)
1715 && (bfd_link_pic (info)
1716 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1717 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1718 }
1719 else
1720 h->got.offset = (bfd_vma) -1;
1721
1722 if (h->dyn_relocs == NULL)
1723 return TRUE;
1724
1725 /* In the shared -Bsymbolic case, discard space allocated for
1726 dynamic pc-relative relocs against symbols which turn out to be
1727 defined in regular objects. For the normal shared case, discard
1728 space for pc-relative relocs that have become local due to symbol
1729 visibility changes. */
1730
1731 if (bfd_link_pic (info))
1732 {
1733 if (SYMBOL_CALLS_LOCAL (info, h))
1734 {
1735 struct elf_dyn_relocs **pp;
1736
1737 for (pp = &h->dyn_relocs; (p = *pp) != NULL; )
1738 {
1739 p->count -= p->pc_count;
1740 p->pc_count = 0;
1741 if (p->count == 0)
1742 *pp = p->next;
1743 else
1744 pp = &p->next;
1745 }
1746 }
1747
1748 /* Also discard relocs on undefined weak syms with non-default
1749 visibility. */
1750 if (h->dyn_relocs != NULL
1751 && h->root.type == bfd_link_hash_undefweak)
1752 {
1753 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1754 || UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
1755 h->dyn_relocs = NULL;
1756
1757 /* Make sure undefined weak symbols are output as a dynamic
1758 symbol in PIEs. */
1759 else if (h->dynindx == -1
1760 && !h->forced_local)
1761 {
1762 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1763 return FALSE;
1764 }
1765 }
1766 }
1767 else if (ELIMINATE_COPY_RELOCS)
1768 {
1769 /* For the non-shared case, discard space for relocs against
1770 symbols which turn out to need copy relocs or are not
1771 dynamic. */
1772
1773 if (!h->non_got_ref
1774 && ((h->def_dynamic
1775 && !h->def_regular)
1776 || (htab->elf.dynamic_sections_created
1777 && (h->root.type == bfd_link_hash_undefweak
1778 || h->root.type == bfd_link_hash_undefined))))
1779 {
1780 /* Make sure this symbol is output as a dynamic symbol.
1781 Undefined weak syms won't yet be marked as dynamic. */
1782 if (h->dynindx == -1
1783 && !h->forced_local)
1784 {
1785 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1786 return FALSE;
1787 }
1788
1789 /* If that succeeded, we know we'll be keeping all the
1790 relocs. */
1791 if (h->dynindx != -1)
1792 goto keep;
1793 }
1794
1795 h->dyn_relocs = NULL;
1796
1797 keep: ;
1798 }
1799
1800 /* Finally, allocate space. */
1801 for (p = h->dyn_relocs; p != NULL; p = p->next)
1802 {
1803 asection *sreloc = elf_section_data (p->sec)->sreloc;
1804
1805 sreloc->size += p->count * sizeof (Elf32_External_Rela);
1806 }
1807
1808 return TRUE;
1809 }
1810
1811 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
1812 read-only sections. */
1813
1814 static bfd_boolean
1815 maybe_set_textrel (struct elf_link_hash_entry *h, void *info_p)
1816 {
1817 asection *sec;
1818
1819 if (h->root.type == bfd_link_hash_indirect)
1820 return TRUE;
1821
1822 sec = _bfd_elf_readonly_dynrelocs (h);
1823 if (sec != NULL)
1824 {
1825 struct bfd_link_info *info = (struct bfd_link_info *) info_p;
1826
1827 info->flags |= DF_TEXTREL;
1828 info->callbacks->minfo
1829 (_("%pB: dynamic relocation against `%pT' in read-only section `%pA'\n"),
1830 sec->owner, h->root.root.string, sec);
1831
1832 /* Not an error, just cut short the traversal. */
1833 return FALSE;
1834 }
1835 return TRUE;
1836 }
1837
1838 /* Set the sizes of the dynamic sections. */
1839
1840 static bfd_boolean
1841 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1842 struct bfd_link_info *info)
1843 {
1844 struct elf_s390_link_hash_table *htab;
1845 bfd *dynobj;
1846 asection *s;
1847 bfd_boolean relocs;
1848 bfd *ibfd;
1849
1850 htab = elf_s390_hash_table (info);
1851 dynobj = htab->elf.dynobj;
1852 if (dynobj == NULL)
1853 abort ();
1854
1855 if (htab->elf.dynamic_sections_created)
1856 {
1857 /* Set the contents of the .interp section to the interpreter. */
1858 if (bfd_link_executable (info) && !info->nointerp)
1859 {
1860 s = bfd_get_linker_section (dynobj, ".interp");
1861 if (s == NULL)
1862 abort ();
1863 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1864 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1865 }
1866 }
1867
1868 /* Set up .got offsets for local syms, and space for local dynamic
1869 relocs. */
1870 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
1871 {
1872 bfd_signed_vma *local_got;
1873 bfd_signed_vma *end_local_got;
1874 char *local_tls_type;
1875 bfd_size_type locsymcount;
1876 Elf_Internal_Shdr *symtab_hdr;
1877 asection *srela;
1878 struct plt_entry *local_plt;
1879 unsigned int i;
1880
1881 if (! is_s390_elf (ibfd))
1882 continue;
1883
1884 for (s = ibfd->sections; s != NULL; s = s->next)
1885 {
1886 struct elf_dyn_relocs *p;
1887
1888 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
1889 {
1890 if (!bfd_is_abs_section (p->sec)
1891 && bfd_is_abs_section (p->sec->output_section))
1892 {
1893 /* Input section has been discarded, either because
1894 it is a copy of a linkonce section or due to
1895 linker script /DISCARD/, so we'll be discarding
1896 the relocs too. */
1897 }
1898 else if (p->count != 0)
1899 {
1900 srela = elf_section_data (p->sec)->sreloc;
1901 srela->size += p->count * sizeof (Elf32_External_Rela);
1902 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1903 info->flags |= DF_TEXTREL;
1904 }
1905 }
1906 }
1907
1908 local_got = elf_local_got_refcounts (ibfd);
1909 if (!local_got)
1910 continue;
1911
1912 symtab_hdr = &elf_symtab_hdr (ibfd);
1913 locsymcount = symtab_hdr->sh_info;
1914 end_local_got = local_got + locsymcount;
1915 local_tls_type = elf_s390_local_got_tls_type (ibfd);
1916 s = htab->elf.sgot;
1917 srela = htab->elf.srelgot;
1918 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1919 {
1920 if (*local_got > 0)
1921 {
1922 *local_got = s->size;
1923 s->size += GOT_ENTRY_SIZE;
1924 if (*local_tls_type == GOT_TLS_GD)
1925 s->size += GOT_ENTRY_SIZE;
1926 if (bfd_link_pic (info))
1927 srela->size += sizeof (Elf32_External_Rela);
1928 }
1929 else
1930 *local_got = (bfd_vma) -1;
1931 }
1932 local_plt = elf_s390_local_plt (ibfd);
1933 for (i = 0; i < symtab_hdr->sh_info; i++)
1934 {
1935 if (local_plt[i].plt.refcount > 0)
1936 {
1937 local_plt[i].plt.offset = htab->elf.iplt->size;
1938 htab->elf.iplt->size += PLT_ENTRY_SIZE;
1939 htab->elf.igotplt->size += GOT_ENTRY_SIZE;
1940 htab->elf.irelplt->size += RELA_ENTRY_SIZE;
1941 }
1942 else
1943 local_plt[i].plt.offset = (bfd_vma) -1;
1944 }
1945 }
1946
1947 if (htab->tls_ldm_got.refcount > 0)
1948 {
1949 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32
1950 relocs. */
1951 htab->tls_ldm_got.offset = htab->elf.sgot->size;
1952 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
1953 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1954 }
1955 else
1956 htab->tls_ldm_got.offset = -1;
1957
1958 /* Allocate global sym .plt and .got entries, and space for global
1959 sym dynamic relocs. */
1960 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
1961
1962 /* We now have determined the sizes of the various dynamic sections.
1963 Allocate memory for them. */
1964 relocs = FALSE;
1965 for (s = dynobj->sections; s != NULL; s = s->next)
1966 {
1967 if ((s->flags & SEC_LINKER_CREATED) == 0)
1968 continue;
1969
1970 if (s == htab->elf.splt
1971 || s == htab->elf.sgot
1972 || s == htab->elf.sgotplt
1973 || s == htab->elf.sdynbss
1974 || s == htab->elf.sdynrelro
1975 || s == htab->elf.iplt
1976 || s == htab->elf.igotplt
1977 || s == htab->irelifunc)
1978 {
1979 /* Strip this section if we don't need it; see the
1980 comment below. */
1981 }
1982 else if (CONST_STRNEQ (bfd_section_name (s), ".rela"))
1983 {
1984 if (s->size != 0)
1985 relocs = TRUE;
1986
1987 /* We use the reloc_count field as a counter if we need
1988 to copy relocs into the output file. */
1989 s->reloc_count = 0;
1990 }
1991 else
1992 {
1993 /* It's not one of our sections, so don't allocate space. */
1994 continue;
1995 }
1996
1997 if (s->size == 0)
1998 {
1999 /* If we don't need this section, strip it from the
2000 output file. This is to handle .rela.bss and
2001 .rela.plt. We must create it in
2002 create_dynamic_sections, because it must be created
2003 before the linker maps input sections to output
2004 sections. The linker does that before
2005 adjust_dynamic_symbol is called, and it is that
2006 function which decides whether anything needs to go
2007 into these sections. */
2008
2009 s->flags |= SEC_EXCLUDE;
2010 continue;
2011 }
2012
2013 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2014 continue;
2015
2016 /* Allocate memory for the section contents. We use bfd_zalloc
2017 here in case unused entries are not reclaimed before the
2018 section's contents are written out. This should not happen,
2019 but this way if it does, we get a R_390_NONE reloc instead
2020 of garbage. */
2021 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2022 if (s->contents == NULL)
2023 return FALSE;
2024 }
2025
2026 if (htab->elf.dynamic_sections_created)
2027 {
2028 /* Add some entries to the .dynamic section. We fill in the
2029 values later, in elf_s390_finish_dynamic_sections, but we
2030 must add the entries now so that we get the correct size for
2031 the .dynamic section. The DT_DEBUG entry is filled in by the
2032 dynamic linker and used by the debugger. */
2033 #define add_dynamic_entry(TAG, VAL) \
2034 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2035
2036 if (bfd_link_executable (info))
2037 {
2038 if (!add_dynamic_entry (DT_DEBUG, 0))
2039 return FALSE;
2040 }
2041
2042 if (htab->elf.splt->size != 0)
2043 {
2044 if (!add_dynamic_entry (DT_PLTGOT, 0)
2045 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2046 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2047 || !add_dynamic_entry (DT_JMPREL, 0))
2048 return FALSE;
2049 }
2050
2051 if (relocs)
2052 {
2053 if (!add_dynamic_entry (DT_RELA, 0)
2054 || !add_dynamic_entry (DT_RELASZ, 0)
2055 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2056 return FALSE;
2057
2058 /* If any dynamic relocs apply to a read-only section,
2059 then we need a DT_TEXTREL entry. */
2060 if ((info->flags & DF_TEXTREL) == 0)
2061 elf_link_hash_traverse (&htab->elf, maybe_set_textrel, info);
2062
2063 if ((info->flags & DF_TEXTREL) != 0)
2064 {
2065 if (!add_dynamic_entry (DT_TEXTREL, 0))
2066 return FALSE;
2067 }
2068 }
2069 }
2070 #undef add_dynamic_entry
2071
2072 return TRUE;
2073 }
2074
2075 /* Return the base VMA address which should be subtracted from real addresses
2076 when resolving @dtpoff relocation.
2077 This is PT_TLS segment p_vaddr. */
2078
2079 static bfd_vma
2080 dtpoff_base (struct bfd_link_info *info)
2081 {
2082 /* If tls_sec is NULL, we should have signalled an error already. */
2083 if (elf_hash_table (info)->tls_sec == NULL)
2084 return 0;
2085 return elf_hash_table (info)->tls_sec->vma;
2086 }
2087
2088 /* Return the relocation value for @tpoff relocation
2089 if STT_TLS virtual address is ADDRESS. */
2090
2091 static bfd_vma
2092 tpoff (struct bfd_link_info *info, bfd_vma address)
2093 {
2094 struct elf_link_hash_table *htab = elf_hash_table (info);
2095
2096 /* If tls_sec is NULL, we should have signalled an error already. */
2097 if (htab->tls_sec == NULL)
2098 return 0;
2099 return htab->tls_size + htab->tls_sec->vma - address;
2100 }
2101
2102 /* Complain if TLS instruction relocation is against an invalid
2103 instruction. */
2104
2105 static void
2106 invalid_tls_insn (bfd *input_bfd,
2107 asection *input_section,
2108 Elf_Internal_Rela *rel)
2109 {
2110 reloc_howto_type *howto;
2111
2112 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info);
2113 _bfd_error_handler
2114 /* xgettext:c-format */
2115 (_("%pB(%pA+%#" PRIx64 "): invalid instruction for TLS relocation %s"),
2116 input_bfd,
2117 input_section,
2118 (uint64_t) rel->r_offset,
2119 howto->name);
2120 bfd_set_error (bfd_error_bad_value);
2121 }
2122
2123 /* Relocate a 390 ELF section. */
2124
2125 static bfd_boolean
2126 elf_s390_relocate_section (bfd *output_bfd,
2127 struct bfd_link_info *info,
2128 bfd *input_bfd,
2129 asection *input_section,
2130 bfd_byte *contents,
2131 Elf_Internal_Rela *relocs,
2132 Elf_Internal_Sym *local_syms,
2133 asection **local_sections)
2134 {
2135 struct elf_s390_link_hash_table *htab;
2136 Elf_Internal_Shdr *symtab_hdr;
2137 struct elf_link_hash_entry **sym_hashes;
2138 bfd_vma *local_got_offsets;
2139 Elf_Internal_Rela *rel;
2140 Elf_Internal_Rela *relend;
2141
2142 if (!is_s390_elf (input_bfd))
2143 {
2144 bfd_set_error (bfd_error_wrong_format);
2145 return FALSE;
2146 }
2147
2148 htab = elf_s390_hash_table (info);
2149 symtab_hdr = &elf_symtab_hdr (input_bfd);
2150 sym_hashes = elf_sym_hashes (input_bfd);
2151 local_got_offsets = elf_local_got_offsets (input_bfd);
2152
2153 rel = relocs;
2154 relend = relocs + input_section->reloc_count;
2155 for (; rel < relend; rel++)
2156 {
2157 unsigned int r_type;
2158 reloc_howto_type *howto;
2159 unsigned long r_symndx;
2160 struct elf_link_hash_entry *h;
2161 Elf_Internal_Sym *sym;
2162 asection *sec;
2163 bfd_vma off;
2164 bfd_vma relocation;
2165 bfd_boolean unresolved_reloc;
2166 bfd_reloc_status_type r;
2167 int tls_type;
2168 asection *base_got = htab->elf.sgot;
2169 bfd_boolean resolved_to_zero;
2170
2171 r_type = ELF32_R_TYPE (rel->r_info);
2172 if (r_type == (int) R_390_GNU_VTINHERIT
2173 || r_type == (int) R_390_GNU_VTENTRY)
2174 continue;
2175 if (r_type >= (int) R_390_max)
2176 {
2177 bfd_set_error (bfd_error_bad_value);
2178 return FALSE;
2179 }
2180
2181 howto = elf_howto_table + r_type;
2182 r_symndx = ELF32_R_SYM (rel->r_info);
2183
2184 h = NULL;
2185 sym = NULL;
2186 sec = NULL;
2187 unresolved_reloc = FALSE;
2188 if (r_symndx < symtab_hdr->sh_info)
2189 {
2190 sym = local_syms + r_symndx;
2191 sec = local_sections[r_symndx];
2192 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2193 {
2194 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd);
2195 if (local_plt == NULL)
2196 return FALSE;
2197
2198 /* Address of the PLT slot. */
2199 relocation = (htab->elf.iplt->output_section->vma
2200 + htab->elf.iplt->output_offset
2201 + local_plt[r_symndx].plt.offset);
2202
2203 switch (r_type)
2204 {
2205 case R_390_PLTOFF16:
2206 case R_390_PLTOFF32:
2207 relocation -= htab->elf.sgot->output_section->vma;
2208 break;
2209 case R_390_GOTPLT12:
2210 case R_390_GOTPLT16:
2211 case R_390_GOTPLT20:
2212 case R_390_GOTPLT32:
2213 case R_390_GOTPLTENT:
2214 case R_390_GOT12:
2215 case R_390_GOT16:
2216 case R_390_GOT20:
2217 case R_390_GOT32:
2218 case R_390_GOTENT:
2219 {
2220 /* Write the PLT slot address into the GOT slot. */
2221 bfd_put_32 (output_bfd, relocation,
2222 htab->elf.sgot->contents +
2223 local_got_offsets[r_symndx]);
2224 relocation = (local_got_offsets[r_symndx] +
2225 htab->elf.sgot->output_offset);
2226
2227 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2228 relocation += htab->elf.sgot->output_section->vma;
2229 break;
2230 }
2231 default:
2232 break;
2233 }
2234 /* The output section is needed later in
2235 finish_dynamic_section when creating the dynamic
2236 relocation. */
2237 local_plt[r_symndx].sec = sec;
2238 goto do_relocation;
2239 }
2240 else
2241 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2242 }
2243 else
2244 {
2245 bfd_boolean warned ATTRIBUTE_UNUSED;
2246 bfd_boolean ignored ATTRIBUTE_UNUSED;
2247
2248 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2249 r_symndx, symtab_hdr, sym_hashes,
2250 h, sec, relocation,
2251 unresolved_reloc, warned, ignored);
2252 }
2253
2254 if (sec != NULL && discarded_section (sec))
2255 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2256 rel, 1, relend, howto, 0, contents);
2257
2258 if (bfd_link_relocatable (info))
2259 continue;
2260
2261 resolved_to_zero = (h != NULL
2262 && UNDEFWEAK_NO_DYNAMIC_RELOC (info, h));
2263
2264 switch (r_type)
2265 {
2266 case R_390_GOTPLT12:
2267 case R_390_GOTPLT16:
2268 case R_390_GOTPLT20:
2269 case R_390_GOTPLT32:
2270 case R_390_GOTPLTENT:
2271 /* There are three cases for a GOTPLT relocation. 1) The
2272 relocation is against the jump slot entry of a plt that
2273 will get emitted to the output file. 2) The relocation
2274 is against the jump slot of a plt entry that has been
2275 removed. elf_s390_adjust_gotplt has created a GOT entry
2276 as replacement. 3) The relocation is against a local symbol.
2277 Cases 2) and 3) are the same as the GOT relocation code
2278 so we just have to test for case 1 and fall through for
2279 the other two. */
2280 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2281 {
2282 bfd_vma plt_index;
2283
2284 if (s390_is_ifunc_symbol_p (h))
2285 {
2286 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2287 relocation = (plt_index * GOT_ENTRY_SIZE +
2288 htab->elf.igotplt->output_offset);
2289 if (r_type == R_390_GOTPLTENT)
2290 relocation += htab->elf.igotplt->output_section->vma;
2291 }
2292 else
2293 {
2294 /* Calc. index no.
2295 Current offset - size first entry / entry size. */
2296 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2297 PLT_ENTRY_SIZE;
2298
2299 /* Offset in GOT is PLT index plus GOT headers(3)
2300 times 4, addr & GOT addr. */
2301 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2302 if (r_type == R_390_GOTPLTENT)
2303 relocation += htab->elf.sgot->output_section->vma;
2304 }
2305 unresolved_reloc = FALSE;
2306
2307 }
2308 /* Fall through. */
2309
2310 case R_390_GOT12:
2311 case R_390_GOT16:
2312 case R_390_GOT20:
2313 case R_390_GOT32:
2314 case R_390_GOTENT:
2315 /* Relocation is to the entry for this symbol in the global
2316 offset table. */
2317 if (base_got == NULL)
2318 abort ();
2319
2320 if (h != NULL)
2321 {
2322 bfd_boolean dyn;
2323
2324 off = h->got.offset;
2325 dyn = htab->elf.dynamic_sections_created;
2326
2327 if (s390_is_ifunc_symbol_p (h))
2328 {
2329 BFD_ASSERT (h->plt.offset != (bfd_vma) -1);
2330 if (off == (bfd_vma)-1)
2331 {
2332 /* No explicit GOT usage so redirect to the
2333 got.iplt slot. */
2334 base_got = htab->elf.igotplt;
2335 off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE;
2336 }
2337 else
2338 {
2339 /* Explicit GOT slots must contain the address
2340 of the PLT slot. This will be handled in
2341 finish_dynamic_symbol. */
2342 }
2343 }
2344 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
2345 bfd_link_pic (info),
2346 h)
2347 || (bfd_link_pic (info)
2348 && SYMBOL_REFERENCES_LOCAL (info, h))
2349 || (ELF_ST_VISIBILITY (h->other)
2350 && h->root.type == bfd_link_hash_undefweak))
2351
2352 {
2353 /* This is actually a static link, or it is a
2354 -Bsymbolic link and the symbol is defined
2355 locally, or the symbol was forced to be local
2356 because of a version file. We must initialize
2357 this entry in the global offset table. Since the
2358 offset must always be a multiple of 2, we use the
2359 least significant bit to record whether we have
2360 initialized it already.
2361
2362 When doing a dynamic link, we create a .rel.got
2363 relocation entry to initialize the value. This
2364 is done in the finish_dynamic_symbol routine. */
2365 if ((off & 1) != 0)
2366 off &= ~1;
2367 else
2368 {
2369 bfd_put_32 (output_bfd, relocation,
2370 base_got->contents + off);
2371 h->got.offset |= 1;
2372 }
2373
2374 if ((h->def_regular
2375 && bfd_link_pic (info)
2376 && SYMBOL_REFERENCES_LOCAL (info, h))
2377 /* lrl rx,sym@GOTENT -> larl rx, sym */
2378 && ((r_type == R_390_GOTENT
2379 && (bfd_get_16 (input_bfd,
2380 contents + rel->r_offset - 2)
2381 & 0xff0f) == 0xc40d)
2382 /* ly rx, sym@GOT(r12) -> larl rx, sym */
2383 || (r_type == R_390_GOT20
2384 && (bfd_get_32 (input_bfd,
2385 contents + rel->r_offset - 2)
2386 & 0xff00f000) == 0xe300c000
2387 && bfd_get_8 (input_bfd,
2388 contents + rel->r_offset + 3) == 0x58)))
2389 {
2390 unsigned short new_insn =
2391 (0xc000 | (bfd_get_8 (input_bfd,
2392 contents + rel->r_offset - 1) & 0xf0));
2393 bfd_put_16 (output_bfd, new_insn,
2394 contents + rel->r_offset - 2);
2395 r_type = R_390_PC32DBL;
2396 rel->r_addend = 2;
2397 howto = elf_howto_table + r_type;
2398 relocation = h->root.u.def.value
2399 + h->root.u.def.section->output_section->vma
2400 + h->root.u.def.section->output_offset;
2401 goto do_relocation;
2402 }
2403 }
2404 else
2405 unresolved_reloc = FALSE;
2406 }
2407 else
2408 {
2409 if (local_got_offsets == NULL)
2410 abort ();
2411
2412 off = local_got_offsets[r_symndx];
2413
2414 /* The offset must always be a multiple of 4. We use
2415 the least significant bit to record whether we have
2416 already generated the necessary reloc. */
2417 if ((off & 1) != 0)
2418 off &= ~1;
2419 else
2420 {
2421 bfd_put_32 (output_bfd, relocation,
2422 htab->elf.sgot->contents + off);
2423
2424 if (bfd_link_pic (info))
2425 {
2426 asection *srelgot;
2427 Elf_Internal_Rela outrel;
2428 bfd_byte *loc;
2429
2430 srelgot = htab->elf.srelgot;
2431 if (srelgot == NULL)
2432 abort ();
2433
2434 outrel.r_offset = (htab->elf.sgot->output_section->vma
2435 + htab->elf.sgot->output_offset
2436 + off);
2437 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2438 outrel.r_addend = relocation;
2439 loc = srelgot->contents;
2440 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
2441 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2442 }
2443
2444 local_got_offsets[r_symndx] |= 1;
2445 }
2446 }
2447
2448 if (off >= (bfd_vma) -2)
2449 abort ();
2450
2451 relocation = base_got->output_offset + off;
2452
2453 /* For @GOTENT the relocation is against the offset between
2454 the instruction and the symbols entry in the GOT and not
2455 between the start of the GOT and the symbols entry. We
2456 add the vma of the GOT to get the correct value. */
2457 if ( r_type == R_390_GOTENT
2458 || r_type == R_390_GOTPLTENT)
2459 relocation += base_got->output_section->vma;
2460
2461 break;
2462
2463 case R_390_GOTOFF16:
2464 case R_390_GOTOFF32:
2465 /* Relocation is relative to the start of the global offset
2466 table. */
2467
2468 if (h != NULL
2469 && s390_is_ifunc_symbol_p (h)
2470 && h->def_regular
2471 && !bfd_link_executable (info))
2472 {
2473 relocation = (htab->elf.iplt->output_section->vma
2474 + htab->elf.iplt->output_offset
2475 + h->plt.offset
2476 - htab->elf.sgot->output_section->vma);
2477 goto do_relocation;
2478 }
2479
2480 /* Note that sgot->output_offset is not involved in this
2481 calculation. We always want the start of .got. If we
2482 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2483 permitted by the ABI, we might have to change this
2484 calculation. */
2485 relocation -= htab->elf.sgot->output_section->vma;
2486 break;
2487
2488 case R_390_GOTPC:
2489 case R_390_GOTPCDBL:
2490 /* Use global offset table as symbol value. */
2491 relocation = htab->elf.sgot->output_section->vma;
2492 unresolved_reloc = FALSE;
2493 break;
2494
2495 case R_390_PLT12DBL:
2496 case R_390_PLT16DBL:
2497 case R_390_PLT24DBL:
2498 case R_390_PLT32DBL:
2499 case R_390_PLT32:
2500 /* Relocation is to the entry for this symbol in the
2501 procedure linkage table. */
2502
2503 /* Resolve a PLT32 reloc against a local symbol directly,
2504 without using the procedure linkage table. */
2505 if (h == NULL)
2506 break;
2507
2508 if (h->plt.offset == (bfd_vma) -1
2509 || (htab->elf.splt == NULL && htab->elf.iplt == NULL))
2510 {
2511 /* We didn't make a PLT entry for this symbol. This
2512 happens when statically linking PIC code, or when
2513 using -Bsymbolic. */
2514 break;
2515 }
2516
2517 if (s390_is_ifunc_symbol_p (h))
2518 relocation = (htab->elf.iplt->output_section->vma
2519 + htab->elf.iplt->output_offset
2520 + h->plt.offset);
2521 else
2522 relocation = (htab->elf.splt->output_section->vma
2523 + htab->elf.splt->output_offset
2524 + h->plt.offset);
2525 unresolved_reloc = FALSE;
2526 break;
2527
2528 case R_390_PLTOFF16:
2529 case R_390_PLTOFF32:
2530 /* Relocation is to the entry for this symbol in the
2531 procedure linkage table relative to the start of the GOT. */
2532
2533 /* For local symbols or if we didn't make a PLT entry for
2534 this symbol resolve the symbol directly. */
2535 if (h == NULL
2536 || h->plt.offset == (bfd_vma) -1
2537 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2538 {
2539 relocation -= htab->elf.sgot->output_section->vma;
2540 break;
2541 }
2542
2543 if (s390_is_ifunc_symbol_p (h))
2544 relocation = (htab->elf.iplt->output_section->vma
2545 + htab->elf.iplt->output_offset
2546 + h->plt.offset
2547 - htab->elf.sgot->output_section->vma);
2548 else
2549 relocation = (htab->elf.splt->output_section->vma
2550 + htab->elf.splt->output_offset
2551 + h->plt.offset
2552 - htab->elf.sgot->output_section->vma);
2553 unresolved_reloc = FALSE;
2554 break;
2555
2556 case R_390_PC16:
2557 case R_390_PC12DBL:
2558 case R_390_PC16DBL:
2559 case R_390_PC24DBL:
2560 case R_390_PC32DBL:
2561 case R_390_PC32:
2562 if (h != NULL
2563 && s390_is_ifunc_symbol_p (h)
2564 && h->def_regular
2565 && !bfd_link_executable (info))
2566 {
2567 /* This will not work our if the function does not
2568 happen to set up the GOT pointer for some other
2569 reason. 31 bit PLT entries require r12 to hold the
2570 GOT pointer.
2571 FIXME: Implement an errorcheck.
2572 NOTE: It will work when brasl is not available
2573 (e.g. with -m31 -march=g5) since a local function
2574 call then does use GOTOFF which implies r12 being set
2575 up. */
2576 relocation = (htab->elf.iplt->output_section->vma
2577 + htab->elf.iplt->output_offset
2578 + h ->plt.offset);
2579 goto do_relocation;
2580 }
2581 /* Fall through. */
2582
2583 case R_390_8:
2584 case R_390_16:
2585 case R_390_32:
2586 if ((input_section->flags & SEC_ALLOC) == 0)
2587 break;
2588
2589 if (h != NULL
2590 && s390_is_ifunc_symbol_p (h)
2591 && h->def_regular)
2592 {
2593 if (!bfd_link_pic (info))
2594 {
2595 /* For a non-shared object STT_GNU_IFUNC symbol must
2596 go through PLT. */
2597 relocation = (htab->elf.iplt->output_section->vma
2598 + htab->elf.iplt->output_offset
2599 + h ->plt.offset);
2600 goto do_relocation;
2601 }
2602 else
2603 {
2604 /* For shared objects a runtime relocation is needed. */
2605
2606 Elf_Internal_Rela outrel;
2607 asection *sreloc;
2608
2609 /* Need a dynamic relocation to get the real function
2610 address. */
2611 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2612 info,
2613 input_section,
2614 rel->r_offset);
2615 if (outrel.r_offset == (bfd_vma) -1
2616 || outrel.r_offset == (bfd_vma) -2)
2617 abort ();
2618
2619 outrel.r_offset += (input_section->output_section->vma
2620 + input_section->output_offset);
2621
2622 if (h->dynindx == -1
2623 || h->forced_local
2624 || bfd_link_executable (info))
2625 {
2626 /* This symbol is resolved locally. */
2627 outrel.r_info = ELF32_R_INFO (0, R_390_IRELATIVE);
2628 outrel.r_addend = (h->root.u.def.value
2629 + h->root.u.def.section->output_section->vma
2630 + h->root.u.def.section->output_offset);
2631 }
2632 else
2633 {
2634 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2635 outrel.r_addend = 0;
2636 }
2637
2638 sreloc = htab->elf.irelifunc;
2639 elf_append_rela (output_bfd, sreloc, &outrel);
2640
2641 /* If this reloc is against an external symbol, we
2642 do not want to fiddle with the addend. Otherwise,
2643 we need to include the symbol value so that it
2644 becomes an addend for the dynamic reloc. For an
2645 internal symbol, we have updated addend. */
2646 continue;
2647 }
2648 }
2649
2650 if ((bfd_link_pic (info)
2651 && (h == NULL
2652 || (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2653 && !resolved_to_zero)
2654 || h->root.type != bfd_link_hash_undefweak)
2655 && ((r_type != R_390_PC16
2656 && r_type != R_390_PC12DBL
2657 && r_type != R_390_PC16DBL
2658 && r_type != R_390_PC24DBL
2659 && r_type != R_390_PC32DBL
2660 && r_type != R_390_PC32)
2661 || !SYMBOL_CALLS_LOCAL (info, h)))
2662 || (ELIMINATE_COPY_RELOCS
2663 && !bfd_link_pic (info)
2664 && h != NULL
2665 && h->dynindx != -1
2666 && !h->non_got_ref
2667 && ((h->def_dynamic
2668 && !h->def_regular)
2669 || h->root.type == bfd_link_hash_undefweak
2670 || h->root.type == bfd_link_hash_undefined)))
2671 {
2672 Elf_Internal_Rela outrel;
2673 bfd_boolean skip, relocate;
2674 asection *sreloc;
2675 bfd_byte *loc;
2676
2677 /* When generating a shared object, these relocations
2678 are copied into the output file to be resolved at run
2679 time. */
2680
2681 skip = FALSE;
2682 relocate = FALSE;
2683
2684 outrel.r_offset =
2685 _bfd_elf_section_offset (output_bfd, info, input_section,
2686 rel->r_offset);
2687 if (outrel.r_offset == (bfd_vma) -1)
2688 skip = TRUE;
2689 else if (outrel.r_offset == (bfd_vma) -2)
2690 skip = TRUE, relocate = TRUE;
2691 outrel.r_offset += (input_section->output_section->vma
2692 + input_section->output_offset);
2693
2694 if (skip)
2695 memset (&outrel, 0, sizeof outrel);
2696 else if (h != NULL
2697 && h->dynindx != -1
2698 && (r_type == R_390_PC16
2699 || r_type == R_390_PC12DBL
2700 || r_type == R_390_PC16DBL
2701 || r_type == R_390_PC24DBL
2702 || r_type == R_390_PC32DBL
2703 || r_type == R_390_PC32
2704 || !bfd_link_pic (info)
2705 || !SYMBOLIC_BIND (info, h)
2706 || !h->def_regular))
2707 {
2708 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2709 outrel.r_addend = rel->r_addend;
2710 }
2711 else
2712 {
2713 /* This symbol is local, or marked to become local. */
2714 outrel.r_addend = relocation + rel->r_addend;
2715 if (r_type == R_390_32)
2716 {
2717 relocate = TRUE;
2718 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2719 }
2720 else
2721 {
2722 long sindx;
2723
2724 if (bfd_is_abs_section (sec))
2725 sindx = 0;
2726 else if (sec == NULL || sec->owner == NULL)
2727 {
2728 bfd_set_error(bfd_error_bad_value);
2729 return FALSE;
2730 }
2731 else
2732 {
2733 asection *osec;
2734
2735 osec = sec->output_section;
2736 sindx = elf_section_data (osec)->dynindx;
2737 if (sindx == 0)
2738 {
2739 osec = htab->elf.text_index_section;
2740 sindx = elf_section_data (osec)->dynindx;
2741 }
2742 BFD_ASSERT (sindx != 0);
2743
2744 /* We are turning this relocation into one
2745 against a section symbol, so subtract out
2746 the output section's address but not the
2747 offset of the input section in the output
2748 section. */
2749 outrel.r_addend -= osec->vma;
2750 }
2751 outrel.r_info = ELF32_R_INFO (sindx, r_type);
2752 }
2753 }
2754
2755 sreloc = elf_section_data (input_section)->sreloc;
2756 if (sreloc == NULL)
2757 abort ();
2758
2759 loc = sreloc->contents;
2760 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2761 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2762
2763 /* If this reloc is against an external symbol, we do
2764 not want to fiddle with the addend. Otherwise, we
2765 need to include the symbol value so that it becomes
2766 an addend for the dynamic reloc. */
2767 if (! relocate)
2768 continue;
2769 }
2770 break;
2771
2772 /* Relocations for tls literal pool entries. */
2773 case R_390_TLS_IE32:
2774 if (bfd_link_pic (info))
2775 {
2776 Elf_Internal_Rela outrel;
2777 asection *sreloc;
2778 bfd_byte *loc;
2779
2780 outrel.r_offset = rel->r_offset
2781 + input_section->output_section->vma
2782 + input_section->output_offset;
2783 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2784 sreloc = elf_section_data (input_section)->sreloc;
2785 if (sreloc == NULL)
2786 abort ();
2787 loc = sreloc->contents;
2788 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2789 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2790 }
2791 /* Fall through. */
2792
2793 case R_390_TLS_GD32:
2794 case R_390_TLS_GOTIE32:
2795 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2796 tls_type = GOT_UNKNOWN;
2797 if (h == NULL && local_got_offsets)
2798 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2799 else if (h != NULL)
2800 {
2801 tls_type = elf_s390_hash_entry(h)->tls_type;
2802 if (!bfd_link_pic (info)
2803 && h->dynindx == -1
2804 && tls_type >= GOT_TLS_IE)
2805 r_type = R_390_TLS_LE32;
2806 }
2807 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE)
2808 r_type = R_390_TLS_IE32;
2809
2810 if (r_type == R_390_TLS_LE32)
2811 {
2812 /* This relocation gets optimized away by the local exec
2813 access optimization. */
2814 BFD_ASSERT (! unresolved_reloc);
2815 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2816 contents + rel->r_offset);
2817 continue;
2818 }
2819
2820 if (htab->elf.sgot == NULL)
2821 abort ();
2822
2823 if (h != NULL)
2824 off = h->got.offset;
2825 else
2826 {
2827 if (local_got_offsets == NULL)
2828 abort ();
2829
2830 off = local_got_offsets[r_symndx];
2831 }
2832
2833 emit_tls_relocs:
2834
2835 if ((off & 1) != 0)
2836 off &= ~1;
2837 else
2838 {
2839 Elf_Internal_Rela outrel;
2840 bfd_byte *loc;
2841 int dr_type, indx;
2842
2843 if (htab->elf.srelgot == NULL)
2844 abort ();
2845
2846 outrel.r_offset = (htab->elf.sgot->output_section->vma
2847 + htab->elf.sgot->output_offset + off);
2848
2849 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2850 if (r_type == R_390_TLS_GD32)
2851 dr_type = R_390_TLS_DTPMOD;
2852 else
2853 dr_type = R_390_TLS_TPOFF;
2854 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2855 outrel.r_addend = relocation - dtpoff_base (info);
2856 else
2857 outrel.r_addend = 0;
2858 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2859 loc = htab->elf.srelgot->contents;
2860 loc += htab->elf.srelgot->reloc_count++
2861 * sizeof (Elf32_External_Rela);
2862 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2863
2864 if (r_type == R_390_TLS_GD32)
2865 {
2866 if (indx == 0)
2867 {
2868 BFD_ASSERT (! unresolved_reloc);
2869 bfd_put_32 (output_bfd,
2870 relocation - dtpoff_base (info),
2871 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
2872 }
2873 else
2874 {
2875 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF);
2876 outrel.r_offset += GOT_ENTRY_SIZE;
2877 outrel.r_addend = 0;
2878 htab->elf.srelgot->reloc_count++;
2879 loc += sizeof (Elf32_External_Rela);
2880 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2881 }
2882 }
2883
2884 if (h != NULL)
2885 h->got.offset |= 1;
2886 else
2887 local_got_offsets[r_symndx] |= 1;
2888 }
2889
2890 if (off >= (bfd_vma) -2)
2891 abort ();
2892 if (r_type == ELF32_R_TYPE (rel->r_info))
2893 {
2894 relocation = htab->elf.sgot->output_offset + off;
2895 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT)
2896 relocation += htab->elf.sgot->output_section->vma;
2897 unresolved_reloc = FALSE;
2898 }
2899 else
2900 {
2901 bfd_put_32 (output_bfd, htab->elf.sgot->output_offset + off,
2902 contents + rel->r_offset);
2903 continue;
2904 }
2905 break;
2906
2907 case R_390_TLS_GOTIE12:
2908 case R_390_TLS_GOTIE20:
2909 case R_390_TLS_IEENT:
2910 if (h == NULL)
2911 {
2912 if (local_got_offsets == NULL)
2913 abort();
2914 off = local_got_offsets[r_symndx];
2915 if (bfd_link_pic (info))
2916 goto emit_tls_relocs;
2917 }
2918 else
2919 {
2920 off = h->got.offset;
2921 tls_type = elf_s390_hash_entry(h)->tls_type;
2922 if (bfd_link_pic (info)
2923 || h->dynindx != -1
2924 || tls_type < GOT_TLS_IE)
2925 goto emit_tls_relocs;
2926 }
2927
2928 if (htab->elf.sgot == NULL)
2929 abort ();
2930
2931 BFD_ASSERT (! unresolved_reloc);
2932 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2933 htab->elf.sgot->contents + off);
2934 relocation = htab->elf.sgot->output_offset + off;
2935 if (r_type == R_390_TLS_IEENT)
2936 relocation += htab->elf.sgot->output_section->vma;
2937 unresolved_reloc = FALSE;
2938 break;
2939
2940 case R_390_TLS_LDM32:
2941 if (! bfd_link_pic (info))
2942 /* The literal pool entry this relocation refers to gets ignored
2943 by the optimized code of the local exec model. Do nothing
2944 and the value will turn out zero. */
2945 continue;
2946
2947 if (htab->elf.sgot == NULL)
2948 abort ();
2949
2950 off = htab->tls_ldm_got.offset;
2951 if (off & 1)
2952 off &= ~1;
2953 else
2954 {
2955 Elf_Internal_Rela outrel;
2956 bfd_byte *loc;
2957
2958 if (htab->elf.srelgot == NULL)
2959 abort ();
2960
2961 outrel.r_offset = (htab->elf.sgot->output_section->vma
2962 + htab->elf.sgot->output_offset + off);
2963
2964 bfd_put_32 (output_bfd, 0,
2965 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
2966 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD);
2967 outrel.r_addend = 0;
2968 loc = htab->elf.srelgot->contents;
2969 loc += htab->elf.srelgot->reloc_count++
2970 * sizeof (Elf32_External_Rela);
2971 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2972 htab->tls_ldm_got.offset |= 1;
2973 }
2974 relocation = htab->elf.sgot->output_offset + off;
2975 unresolved_reloc = FALSE;
2976 break;
2977
2978 case R_390_TLS_LE32:
2979 if (bfd_link_dll (info))
2980 {
2981 /* Linking a shared library with non-fpic code requires
2982 a R_390_TLS_TPOFF relocation. */
2983 Elf_Internal_Rela outrel;
2984 asection *sreloc;
2985 bfd_byte *loc;
2986 int indx;
2987
2988 outrel.r_offset = rel->r_offset
2989 + input_section->output_section->vma
2990 + input_section->output_offset;
2991 if (h != NULL && h->dynindx != -1)
2992 indx = h->dynindx;
2993 else
2994 indx = 0;
2995 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF);
2996 if (indx == 0)
2997 outrel.r_addend = relocation - dtpoff_base (info);
2998 else
2999 outrel.r_addend = 0;
3000 sreloc = elf_section_data (input_section)->sreloc;
3001 if (sreloc == NULL)
3002 abort ();
3003 loc = sreloc->contents;
3004 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
3005 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3006 }
3007 else
3008 {
3009 BFD_ASSERT (! unresolved_reloc);
3010 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3011 contents + rel->r_offset);
3012 }
3013 continue;
3014
3015 case R_390_TLS_LDO32:
3016 if (bfd_link_pic (info) || (input_section->flags & SEC_DEBUGGING))
3017 relocation -= dtpoff_base (info);
3018 else
3019 /* When converting LDO to LE, we must negate. */
3020 relocation = -tpoff (info, relocation);
3021 break;
3022
3023 /* Relocations for tls instructions. */
3024 case R_390_TLS_LOAD:
3025 case R_390_TLS_GDCALL:
3026 case R_390_TLS_LDCALL:
3027 tls_type = GOT_UNKNOWN;
3028 if (h == NULL && local_got_offsets)
3029 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
3030 else if (h != NULL)
3031 tls_type = elf_s390_hash_entry(h)->tls_type;
3032
3033 if (tls_type == GOT_TLS_GD)
3034 continue;
3035
3036 if (r_type == R_390_TLS_LOAD)
3037 {
3038 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
3039 {
3040 /* IE->LE transition. Four valid cases:
3041 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0
3042 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0
3043 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0
3044 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
3045 unsigned int insn, ry;
3046
3047 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3048 if ((insn & 0xff00f000) == 0x58000000)
3049 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */
3050 ry = (insn & 0x000f0000);
3051 else if ((insn & 0xff0f0000) == 0x58000000)
3052 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */
3053 ry = (insn & 0x0000f000) << 4;
3054 else if ((insn & 0xff00f000) == 0x5800c000)
3055 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */
3056 ry = (insn & 0x000f0000);
3057 else if ((insn & 0xff0f0000) == 0x580c0000)
3058 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
3059 ry = (insn & 0x0000f000) << 4;
3060 else
3061 {
3062 invalid_tls_insn (input_bfd, input_section, rel);
3063 return FALSE;
3064 }
3065 insn = 0x18000700 | (insn & 0x00f00000) | ry;
3066 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3067 }
3068 }
3069 else if (r_type == R_390_TLS_GDCALL)
3070 {
3071 unsigned int insn;
3072
3073 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3074 if ((insn & 0xff000fff) != 0x4d000000 &&
3075 (insn & 0xffff0000) != 0xc0e50000 &&
3076 (insn & 0xff000000) != 0x0d000000)
3077 {
3078 invalid_tls_insn (input_bfd, input_section, rel);
3079 return FALSE;
3080 }
3081 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
3082 {
3083 if ((insn & 0xff000000) == 0x0d000000)
3084 {
3085 /* GD->LE transition.
3086 basr rx, ry -> nopr r7 */
3087 insn = 0x07070000 | (insn & 0xffff);
3088 }
3089 else if ((insn & 0xff000000) == 0x4d000000)
3090 {
3091 /* GD->LE transition.
3092 bas %r14,0(%rx,%r13) -> bc 0,0 */
3093 insn = 0x47000000;
3094 }
3095 else
3096 {
3097 /* GD->LE transition.
3098 brasl %r14,_tls_get_offset@plt -> brcl 0,. */
3099 insn = 0xc0040000;
3100 bfd_put_16 (output_bfd, 0x0000,
3101 contents + rel->r_offset + 4);
3102 }
3103 }
3104 else
3105 {
3106 /* If basr is used in the pic case to invoke
3107 _tls_get_offset, something went wrong before. */
3108 if ((insn & 0xff000000) == 0x0d000000)
3109 {
3110 invalid_tls_insn (input_bfd, input_section, rel);
3111 return FALSE;
3112 }
3113
3114 if ((insn & 0xff000000) == 0x4d000000)
3115 {
3116 /* GD->IE transition.
3117 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */
3118 insn = 0x5822c000;
3119 }
3120 else
3121 {
3122 /* GD->IE transition.
3123 brasl %r14,__tls_get_addr@plt ->
3124 l %r2,0(%r2,%r12) ; bcr 0,0 */
3125 insn = 0x5822c000;
3126 bfd_put_16 (output_bfd, 0x0700,
3127 contents + rel->r_offset + 4);
3128 }
3129 }
3130 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3131 }
3132 else if (r_type == R_390_TLS_LDCALL)
3133 {
3134 if (!bfd_link_pic (info))
3135 {
3136 unsigned int insn;
3137
3138 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3139 if ((insn & 0xff000fff) != 0x4d000000 &&
3140 (insn & 0xffff0000) != 0xc0e50000 &&
3141 (insn & 0xff000000) != 0x0d000000)
3142 {
3143 invalid_tls_insn (input_bfd, input_section, rel);
3144 return FALSE;
3145 }
3146
3147 if ((insn & 0xff000000) == 0x0d000000)
3148 {
3149 /* LD->LE transition.
3150 basr rx, ry -> nopr r7 */
3151 insn = 0x07070000 | (insn & 0xffff);
3152 }
3153 else if ((insn & 0xff000000) == 0x4d000000)
3154 {
3155 /* LD->LE transition.
3156 bas %r14,0(%rx,%r13) -> bc 0,0 */
3157 insn = 0x47000000;
3158 }
3159 else
3160 {
3161 /* LD->LE transition.
3162 brasl %r14,__tls_get_offset@plt -> brcl 0,. */
3163 insn = 0xc0040000;
3164 bfd_put_16 (output_bfd, 0x0000,
3165 contents + rel->r_offset + 4);
3166 }
3167 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3168 }
3169 }
3170 continue;
3171
3172 default:
3173 break;
3174 }
3175
3176 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3177 because such sections are not SEC_ALLOC and thus ld.so will
3178 not process them. */
3179 if (unresolved_reloc
3180 && !((input_section->flags & SEC_DEBUGGING) != 0
3181 && h->def_dynamic)
3182 && _bfd_elf_section_offset (output_bfd, info, input_section,
3183 rel->r_offset) != (bfd_vma) -1)
3184 _bfd_error_handler
3185 /* xgettext:c-format */
3186 (_("%pB(%pA+%#" PRIx64 "): "
3187 "unresolvable %s relocation against symbol `%s'"),
3188 input_bfd,
3189 input_section,
3190 (uint64_t) rel->r_offset,
3191 howto->name,
3192 h->root.root.string);
3193
3194 do_relocation:
3195
3196 /* When applying a 24 bit reloc we need to start one byte
3197 earlier. Otherwise the 32 bit get/put bfd operations might
3198 access a byte after the actual section. */
3199 if (r_type == R_390_PC24DBL
3200 || r_type == R_390_PLT24DBL)
3201 rel->r_offset--;
3202
3203 if (r_type == R_390_20
3204 || r_type == R_390_GOT20
3205 || r_type == R_390_GOTPLT20
3206 || r_type == R_390_TLS_GOTIE20)
3207 {
3208 relocation += rel->r_addend;
3209 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3210 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3211 contents, rel->r_offset,
3212 relocation, 0);
3213 }
3214 else
3215 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3216 contents, rel->r_offset,
3217 relocation, rel->r_addend);
3218
3219 if (r != bfd_reloc_ok)
3220 {
3221 const char *name;
3222
3223 if (h != NULL)
3224 name = h->root.root.string;
3225 else
3226 {
3227 name = bfd_elf_string_from_elf_section (input_bfd,
3228 symtab_hdr->sh_link,
3229 sym->st_name);
3230 if (name == NULL)
3231 return FALSE;
3232 if (*name == '\0')
3233 name = bfd_section_name (sec);
3234 }
3235
3236 if (r == bfd_reloc_overflow)
3237 (*info->callbacks->reloc_overflow)
3238 (info, (h ? &h->root : NULL), name, howto->name,
3239 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3240 else
3241 {
3242 _bfd_error_handler
3243 /* xgettext:c-format */
3244 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3245 input_bfd, input_section,
3246 (uint64_t) rel->r_offset, name, (int) r);
3247 return FALSE;
3248 }
3249 }
3250 }
3251
3252 return TRUE;
3253 }
3254
3255 /* Generate the PLT slots together with the dynamic relocations needed
3256 for IFUNC symbols. */
3257
3258 static void
3259 elf_s390_finish_ifunc_symbol (bfd *output_bfd,
3260 struct bfd_link_info *info,
3261 struct elf_link_hash_entry *h,
3262 struct elf_s390_link_hash_table *htab,
3263 bfd_vma iplt_offset,
3264 bfd_vma resolver_address)
3265 {
3266 bfd_vma iplt_index;
3267 bfd_vma got_offset;
3268 bfd_vma igotiplt_offset;
3269 Elf_Internal_Rela rela;
3270 bfd_byte *loc;
3271 asection *plt, *gotplt, *relplt;
3272 bfd_vma relative_offset;
3273
3274 if (htab->elf.iplt == NULL
3275 || htab->elf.igotplt == NULL
3276 || htab->elf.irelplt == NULL)
3277 abort ();
3278
3279 gotplt = htab->elf.igotplt;
3280 relplt = htab->elf.irelplt;
3281
3282 /* Index of the PLT slot within iplt section. */
3283 iplt_index = iplt_offset / PLT_ENTRY_SIZE;
3284 plt = htab->elf.iplt;
3285 /* Offset into the igot.plt section. */
3286 igotiplt_offset = iplt_index * GOT_ENTRY_SIZE;
3287 /* Offset into the got section. */
3288 got_offset = igotiplt_offset + gotplt->output_offset;
3289
3290 /* S390 uses halfwords for relative branch calc! */
3291 relative_offset = - (plt->output_offset +
3292 (PLT_ENTRY_SIZE * iplt_index) + 18) / 2;
3293 /* If offset is > 32768, branch to a previous branch
3294 390 can only handle +-64 K jumps. */
3295 if ( -32768 > (int) relative_offset )
3296 relative_offset
3297 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3298
3299 /* Fill in the entry in the procedure linkage table. */
3300 if (!bfd_link_pic (info))
3301 {
3302 memcpy (plt->contents + iplt_offset, elf_s390_plt_entry,
3303 PLT_ENTRY_SIZE);
3304
3305 /* Adjust jump to the first plt entry. */
3306 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3307 plt->contents + iplt_offset + 20);
3308
3309 /* Push the GOT offset field. */
3310 bfd_put_32 (output_bfd,
3311 (gotplt->output_section->vma
3312 + got_offset),
3313 plt->contents + iplt_offset + 24);
3314 }
3315 else if (got_offset < 4096)
3316 {
3317 /* The GOT offset is small enough to be used directly as
3318 displacement. */
3319 memcpy (plt->contents + iplt_offset,
3320 elf_s390_plt_pic12_entry,
3321 PLT_ENTRY_SIZE);
3322
3323 /* Put in the GOT offset as displacement value. The 0xc000
3324 value comes from the first word of the plt entry. Look
3325 at the elf_s390_plt_pic16_entry content. */
3326 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset,
3327 plt->contents + iplt_offset + 2);
3328
3329 /* Adjust the jump to the first plt entry. */
3330 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3331 plt->contents + iplt_offset + 20);
3332 }
3333 else if (got_offset < 32768)
3334 {
3335 /* The GOT offset is too big for a displacement but small
3336 enough to be a signed 16 bit immediate value as it can be
3337 used in an lhi instruction. */
3338 memcpy (plt->contents + iplt_offset,
3339 elf_s390_plt_pic16_entry,
3340 PLT_ENTRY_SIZE);
3341
3342 /* Put in the GOT offset for the lhi instruction. */
3343 bfd_put_16 (output_bfd, (bfd_vma)got_offset,
3344 plt->contents + iplt_offset + 2);
3345
3346 /* Adjust the jump to the first plt entry. */
3347 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3348 plt->contents + iplt_offset + 20);
3349 }
3350 else
3351 {
3352 memcpy (plt->contents + iplt_offset,
3353 elf_s390_plt_pic_entry,
3354 PLT_ENTRY_SIZE);
3355
3356 /* Adjust the jump to the first plt entry. */
3357 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3358 plt->contents + iplt_offset + 20);
3359
3360 /* Push the GOT offset field. */
3361 bfd_put_32 (output_bfd, got_offset,
3362 plt->contents + iplt_offset + 24);
3363 }
3364 /* Insert offset into reloc. table here. */
3365 bfd_put_32 (output_bfd, relplt->output_offset +
3366 iplt_index * RELA_ENTRY_SIZE,
3367 plt->contents + iplt_offset + 28);
3368
3369 /* Fill in the entry in the global offset table.
3370 Points to instruction after GOT offset. */
3371 bfd_put_32 (output_bfd,
3372 (plt->output_section->vma
3373 + plt->output_offset
3374 + iplt_offset
3375 + 12),
3376 gotplt->contents + igotiplt_offset);
3377
3378 /* Fill in the entry in the .rela.plt section. */
3379 rela.r_offset = gotplt->output_section->vma + got_offset;
3380
3381 if (!h
3382 || h->dynindx == -1
3383 || ((bfd_link_executable (info)
3384 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3385 && h->def_regular))
3386 {
3387 /* The symbol can be locally resolved. */
3388 rela.r_info = ELF32_R_INFO (0, R_390_IRELATIVE);
3389 rela.r_addend = resolver_address;
3390 }
3391 else
3392 {
3393 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3394 rela.r_addend = 0;
3395 }
3396
3397 loc = relplt->contents + iplt_index * RELA_ENTRY_SIZE;
3398 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3399 }
3400
3401 /* Finish up dynamic symbol handling. We set the contents of various
3402 dynamic sections here. */
3403
3404 static bfd_boolean
3405 elf_s390_finish_dynamic_symbol (bfd *output_bfd,
3406 struct bfd_link_info *info,
3407 struct elf_link_hash_entry *h,
3408 Elf_Internal_Sym *sym)
3409 {
3410 struct elf_s390_link_hash_table *htab;
3411 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h;
3412
3413 htab = elf_s390_hash_table (info);
3414
3415 if (h->plt.offset != (bfd_vma) -1)
3416 {
3417 bfd_vma plt_index;
3418 bfd_vma got_offset;
3419 Elf_Internal_Rela rela;
3420 bfd_byte *loc;
3421 bfd_vma relative_offset;
3422
3423 /* This symbol has an entry in the procedure linkage table. Set
3424 it up. */
3425 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
3426 {
3427 elf_s390_finish_ifunc_symbol (output_bfd, info, h,
3428 htab, h->plt.offset,
3429 eh->ifunc_resolver_address +
3430 eh->ifunc_resolver_section->output_offset +
3431 eh->ifunc_resolver_section->output_section->vma);
3432 /* Do not return yet. Handling of explicit GOT slots of
3433 IFUNC symbols is below. */
3434 }
3435 else
3436 {
3437 if (h->dynindx == -1
3438 || htab->elf.splt == NULL
3439 || htab->elf.sgotplt == NULL
3440 || htab->elf.srelplt == NULL)
3441 abort ();
3442
3443 /* Calc. index no.
3444 Current offset - size first entry / entry size. */
3445 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3446
3447 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
3448 addr & GOT addr. */
3449 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3450
3451 /* S390 uses halfwords for relative branch calc! */
3452 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
3453 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
3454 /* If offset is > 32768, branch to a previous branch
3455 390 can only handle +-64 K jumps. */
3456 if ( -32768 > (int) relative_offset )
3457 relative_offset
3458 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3459
3460 /* Fill in the entry in the procedure linkage table. */
3461 if (!bfd_link_pic (info))
3462 {
3463 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390_plt_entry,
3464 PLT_ENTRY_SIZE);
3465
3466 /* Adjust jump to the first plt entry. */
3467 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3468 htab->elf.splt->contents + h->plt.offset + 20);
3469
3470 /* Push the GOT offset field. */
3471 bfd_put_32 (output_bfd,
3472 (htab->elf.sgotplt->output_section->vma
3473 + htab->elf.sgotplt->output_offset
3474 + got_offset),
3475 htab->elf.splt->contents + h->plt.offset + 24);
3476 }
3477 else if (got_offset < 4096)
3478 {
3479 /* The GOT offset is small enough to be used directly as
3480 displacement. */
3481 memcpy (htab->elf.splt->contents + h->plt.offset,
3482 elf_s390_plt_pic12_entry,
3483 PLT_ENTRY_SIZE);
3484
3485 /* Put in the GOT offset as displacement value. The 0xc000
3486 value comes from the first word of the plt entry. Look
3487 at the elf_s390_plt_pic12_entry content. */
3488 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset,
3489 htab->elf.splt->contents + h->plt.offset + 2);
3490
3491 /* Adjust the jump to the first plt entry. */
3492 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3493 htab->elf.splt->contents + h->plt.offset + 20);
3494 }
3495 else if (got_offset < 32768)
3496 {
3497 /* The GOT offset is too big for a displacement but small
3498 enough to be a signed 16 bit immediate value as it can be
3499 used in an lhi instruction. */
3500 memcpy (htab->elf.splt->contents + h->plt.offset,
3501 elf_s390_plt_pic16_entry,
3502 PLT_ENTRY_SIZE);
3503
3504 /* Put in the GOT offset for the lhi instruction. */
3505 bfd_put_16 (output_bfd, (bfd_vma)got_offset,
3506 htab->elf.splt->contents + h->plt.offset + 2);
3507
3508 /* Adjust the jump to the first plt entry. */
3509 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3510 htab->elf.splt->contents + h->plt.offset + 20);
3511 }
3512 else
3513 {
3514 memcpy (htab->elf.splt->contents + h->plt.offset,
3515 elf_s390_plt_pic_entry,
3516 PLT_ENTRY_SIZE);
3517
3518 /* Adjust the jump to the first plt entry. */
3519 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3520 htab->elf.splt->contents + h->plt.offset + 20);
3521
3522 /* Push the GOT offset field. */
3523 bfd_put_32 (output_bfd, got_offset,
3524 htab->elf.splt->contents + h->plt.offset + 24);
3525 }
3526 /* Insert offset into reloc. table here. */
3527 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
3528 htab->elf.splt->contents + h->plt.offset + 28);
3529
3530 /* Fill in the entry in the global offset table.
3531 Points to instruction after GOT offset. */
3532 bfd_put_32 (output_bfd,
3533 (htab->elf.splt->output_section->vma
3534 + htab->elf.splt->output_offset
3535 + h->plt.offset
3536 + 12),
3537 htab->elf.sgotplt->contents + got_offset);
3538
3539 /* Fill in the entry in the .rela.plt section. */
3540 rela.r_offset = (htab->elf.sgotplt->output_section->vma
3541 + htab->elf.sgotplt->output_offset
3542 + got_offset);
3543 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3544 rela.r_addend = 0;
3545 loc = htab->elf.srelplt->contents + plt_index * sizeof (Elf32_External_Rela);
3546 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3547
3548 if (!h->def_regular)
3549 {
3550 /* Mark the symbol as undefined, rather than as defined in
3551 the .plt section. Leave the value alone. This is a clue
3552 for the dynamic linker, to make function pointer
3553 comparisons work between an application and shared
3554 library. */
3555 sym->st_shndx = SHN_UNDEF;
3556 }
3557 }
3558 }
3559
3560 if (h->got.offset != (bfd_vma) -1
3561 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3562 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3563 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3564 {
3565 Elf_Internal_Rela rela;
3566 bfd_byte *loc;
3567
3568 /* This symbol has an entry in the global offset table. Set it
3569 up. */
3570
3571 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3572 abort ();
3573
3574 rela.r_offset = (htab->elf.sgot->output_section->vma
3575 + htab->elf.sgot->output_offset
3576 + (h->got.offset &~ (bfd_vma) 1));
3577
3578 /* If this is a static link, or it is a -Bsymbolic link and the
3579 symbol is defined locally or was forced to be local because
3580 of a version file, we just want to emit a RELATIVE reloc.
3581 The entry in the global offset table will already have been
3582 initialized in the relocate_section function. */
3583 if (h->def_regular && s390_is_ifunc_symbol_p (h))
3584 {
3585 if (bfd_link_pic (info))
3586 {
3587 /* An explicit GOT slot usage needs GLOB_DAT. If the
3588 symbol references local the implicit got.iplt slot
3589 will be used and the IRELATIVE reloc has been created
3590 above. */
3591 goto do_glob_dat;
3592 }
3593 else
3594 {
3595 /* For non-shared objects explicit GOT slots must be
3596 filled with the PLT slot address for pointer
3597 equality reasons. */
3598 bfd_put_32 (output_bfd, (htab->elf.iplt->output_section->vma
3599 + htab->elf.iplt->output_offset
3600 + h->plt.offset),
3601 htab->elf.sgot->contents + h->got.offset);
3602 return TRUE;
3603 }
3604 }
3605 else if (bfd_link_pic (info)
3606 && SYMBOL_REFERENCES_LOCAL (info, h))
3607 {
3608 /* If this is a static link, or it is a -Bsymbolic link and
3609 the symbol is defined locally or was forced to be local
3610 because of a version file, we just want to emit a
3611 RELATIVE reloc. The entry in the global offset table
3612 will already have been initialized in the
3613 relocate_section function. */
3614 if (!(h->def_regular || ELF_COMMON_DEF_P (h)))
3615 return FALSE;
3616 BFD_ASSERT((h->got.offset & 1) != 0);
3617 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
3618 rela.r_addend = (h->root.u.def.value
3619 + h->root.u.def.section->output_section->vma
3620 + h->root.u.def.section->output_offset);
3621 }
3622 else
3623 {
3624 BFD_ASSERT((h->got.offset & 1) == 0);
3625 do_glob_dat:
3626 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset);
3627 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
3628 rela.r_addend = 0;
3629 }
3630
3631 loc = htab->elf.srelgot->contents;
3632 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3633 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3634 }
3635
3636 if (h->needs_copy)
3637 {
3638 Elf_Internal_Rela rela;
3639 asection *s;
3640 bfd_byte *loc;
3641
3642 /* This symbols needs a copy reloc. Set it up. */
3643
3644 if (h->dynindx == -1
3645 || (h->root.type != bfd_link_hash_defined
3646 && h->root.type != bfd_link_hash_defweak)
3647 || htab->elf.srelbss == NULL
3648 || htab->elf.sreldynrelro == NULL)
3649 abort ();
3650
3651 rela.r_offset = (h->root.u.def.value
3652 + h->root.u.def.section->output_section->vma
3653 + h->root.u.def.section->output_offset);
3654 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
3655 rela.r_addend = 0;
3656 if (h->root.u.def.section == htab->elf.sdynrelro)
3657 s = htab->elf.sreldynrelro;
3658 else
3659 s = htab->elf.srelbss;
3660 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela);
3661 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3662 }
3663
3664 /* Mark some specially defined symbols as absolute. */
3665 if (h == htab->elf.hdynamic
3666 || h == htab->elf.hgot
3667 || h == htab->elf.hplt)
3668 sym->st_shndx = SHN_ABS;
3669
3670 return TRUE;
3671 }
3672
3673 /* Used to decide how to sort relocs in an optimal manner for the
3674 dynamic linker, before writing them out. */
3675
3676 static enum elf_reloc_type_class
3677 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
3678 const asection *rel_sec ATTRIBUTE_UNUSED,
3679 const Elf_Internal_Rela *rela)
3680 {
3681 bfd *abfd = info->output_bfd;
3682 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3683 struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info);
3684 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3685 Elf_Internal_Sym sym;
3686
3687 if (htab->elf.dynsym == NULL
3688 || !bed->s->swap_symbol_in (abfd,
3689 (htab->elf.dynsym->contents
3690 + r_symndx * bed->s->sizeof_sym),
3691 0, &sym))
3692 abort ();
3693
3694 /* Check relocation against STT_GNU_IFUNC symbol. */
3695 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3696 return reloc_class_ifunc;
3697
3698 switch ((int) ELF32_R_TYPE (rela->r_info))
3699 {
3700 case R_390_RELATIVE:
3701 return reloc_class_relative;
3702 case R_390_JMP_SLOT:
3703 return reloc_class_plt;
3704 case R_390_COPY:
3705 return reloc_class_copy;
3706 default:
3707 return reloc_class_normal;
3708 }
3709 }
3710
3711 /* Finish up the dynamic sections. */
3712
3713 static bfd_boolean
3714 elf_s390_finish_dynamic_sections (bfd *output_bfd,
3715 struct bfd_link_info *info)
3716 {
3717 struct elf_s390_link_hash_table *htab;
3718 bfd *dynobj;
3719 asection *sdyn;
3720 bfd *ibfd;
3721 unsigned int i;
3722
3723 htab = elf_s390_hash_table (info);
3724 dynobj = htab->elf.dynobj;
3725 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3726
3727 if (htab->elf.dynamic_sections_created)
3728 {
3729 Elf32_External_Dyn *dyncon, *dynconend;
3730
3731 if (sdyn == NULL || htab->elf.sgot == NULL)
3732 abort ();
3733
3734 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3735 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3736 for (; dyncon < dynconend; dyncon++)
3737 {
3738 Elf_Internal_Dyn dyn;
3739 asection *s;
3740
3741 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3742
3743 switch (dyn.d_tag)
3744 {
3745 default:
3746 continue;
3747
3748 case DT_PLTGOT:
3749 s = htab->elf.sgotplt;
3750 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3751 break;
3752
3753 case DT_JMPREL:
3754 s = htab->elf.srelplt;
3755 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3756 break;
3757
3758 case DT_PLTRELSZ:
3759 dyn.d_un.d_val = htab->elf.srelplt->size;
3760 if (htab->elf.irelplt)
3761 dyn.d_un.d_val += htab->elf.irelplt->size;
3762 break;
3763 }
3764
3765 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3766 }
3767
3768 /* Fill in the special first entry in the procedure linkage table. */
3769 if (htab->elf.splt && htab->elf.splt->size > 0)
3770 {
3771 memset (htab->elf.splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
3772 if (bfd_link_pic (info))
3773 {
3774 memcpy (htab->elf.splt->contents, elf_s390_plt_pic_first_entry,
3775 PLT_FIRST_ENTRY_SIZE);
3776 }
3777 else
3778 {
3779 memcpy (htab->elf.splt->contents, elf_s390_plt_first_entry,
3780 PLT_FIRST_ENTRY_SIZE);
3781 bfd_put_32 (output_bfd,
3782 htab->elf.sgotplt->output_section->vma
3783 + htab->elf.sgotplt->output_offset,
3784 htab->elf.splt->contents + 24);
3785 }
3786 elf_section_data (htab->elf.splt->output_section)
3787 ->this_hdr.sh_entsize = 4;
3788 }
3789
3790 }
3791
3792 if (htab->elf.sgotplt)
3793 {
3794 /* Fill in the first three entries in the global offset table. */
3795 if (htab->elf.sgotplt->size > 0)
3796 {
3797 bfd_put_32 (output_bfd,
3798 (sdyn == NULL ? (bfd_vma) 0
3799 : sdyn->output_section->vma + sdyn->output_offset),
3800 htab->elf.sgotplt->contents);
3801 /* One entry for shared object struct ptr. */
3802 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 4);
3803 /* One entry for _dl_runtime_resolve. */
3804 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8);
3805 }
3806
3807 elf_section_data (htab->elf.sgotplt->output_section)
3808 ->this_hdr.sh_entsize = 4;
3809 }
3810 /* Finish dynamic symbol for local IFUNC symbols. */
3811 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3812 {
3813 struct plt_entry *local_plt;
3814 Elf_Internal_Sym *isym;
3815 Elf_Internal_Shdr *symtab_hdr;
3816
3817 symtab_hdr = &elf_symtab_hdr (ibfd);
3818
3819 if (!is_s390_elf (ibfd))
3820 continue;
3821
3822 local_plt = elf_s390_local_plt (ibfd);
3823 if (local_plt != NULL)
3824 for (i = 0; i < symtab_hdr->sh_info; i++)
3825 {
3826 if (local_plt[i].plt.offset != (bfd_vma) -1)
3827 {
3828 asection *sec = local_plt[i].sec;
3829 isym = bfd_sym_from_r_symndx (&htab->sym_cache, ibfd, i);
3830 if (isym == NULL)
3831 return FALSE;
3832
3833 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
3834 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab,
3835 local_plt[i].plt.offset,
3836 isym->st_value
3837 + sec->output_section->vma
3838 + sec->output_offset);
3839
3840 }
3841 }
3842 }
3843 return TRUE;
3844 }
3845 \f
3846 /* Support for core dump NOTE sections. */
3847
3848 static bfd_boolean
3849 elf_s390_grok_prstatus (bfd * abfd, Elf_Internal_Note * note)
3850 {
3851 int offset;
3852 unsigned int size;
3853
3854 switch (note->descsz)
3855 {
3856 default:
3857 return FALSE;
3858
3859 case 224: /* S/390 Linux. */
3860 /* pr_cursig */
3861 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
3862
3863 /* pr_pid */
3864 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
3865
3866 /* pr_reg */
3867 offset = 72;
3868 size = 144;
3869 break;
3870 }
3871
3872 /* Make a ".reg/999" section. */
3873 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
3874 size, note->descpos + offset);
3875 }
3876
3877 static bfd_boolean
3878 elf_s390_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3879 {
3880 switch (note->descsz)
3881 {
3882 default:
3883 return FALSE;
3884
3885 case 124: /* sizeof(struct elf_prpsinfo) on s390 */
3886 elf_tdata (abfd)->core->pid
3887 = bfd_get_32 (abfd, note->descdata + 12);
3888 elf_tdata (abfd)->core->program
3889 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
3890 elf_tdata (abfd)->core->command
3891 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
3892 break;
3893 }
3894
3895 /* Note that for some reason, a spurious space is tacked
3896 onto the end of the args in some (at least one anyway)
3897 implementations, so strip it off if it exists. */
3898
3899 {
3900 char *command = elf_tdata (abfd)->core->command;
3901 int n = strlen (command);
3902
3903 if (0 < n && command[n - 1] == ' ')
3904 command[n - 1] = '\0';
3905 }
3906
3907 return TRUE;
3908 }
3909
3910 static char *
3911 elf_s390_write_core_note (bfd *abfd, char *buf, int *bufsiz,
3912 int note_type, ...)
3913 {
3914 va_list ap;
3915
3916 switch (note_type)
3917 {
3918 default:
3919 return NULL;
3920
3921 case NT_PRPSINFO:
3922 {
3923 char data[124] ATTRIBUTE_NONSTRING = { 0 };
3924 const char *fname, *psargs;
3925
3926 va_start (ap, note_type);
3927 fname = va_arg (ap, const char *);
3928 psargs = va_arg (ap, const char *);
3929 va_end (ap);
3930
3931 strncpy (data + 28, fname, 16);
3932 #if GCC_VERSION == 8000 || GCC_VERSION == 8001
3933 DIAGNOSTIC_PUSH;
3934 /* GCC 8.0 and 8.1 warn about 80 equals destination size with
3935 -Wstringop-truncation:
3936 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85643
3937 */
3938 DIAGNOSTIC_IGNORE_STRINGOP_TRUNCATION;
3939 #endif
3940 strncpy (data + 44, psargs, 80);
3941 #if GCC_VERSION == 8000 || GCC_VERSION == 8001
3942 DIAGNOSTIC_POP;
3943 #endif
3944 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
3945 &data, sizeof (data));
3946 }
3947
3948 case NT_PRSTATUS:
3949 {
3950 char data[224] = { 0 };
3951 long pid;
3952 int cursig;
3953 const void *gregs;
3954
3955 va_start (ap, note_type);
3956 pid = va_arg (ap, long);
3957 cursig = va_arg (ap, int);
3958 gregs = va_arg (ap, const void *);
3959 va_end (ap);
3960
3961 bfd_put_16 (abfd, cursig, data + 12);
3962 bfd_put_32 (abfd, pid, data + 24);
3963 memcpy (data + 72, gregs, 144);
3964 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
3965 &data, sizeof (data));
3966 }
3967 }
3968 /* NOTREACHED */
3969 }
3970 \f
3971 /* Return address for Ith PLT stub in section PLT, for relocation REL
3972 or (bfd_vma) -1 if it should not be included. */
3973
3974 static bfd_vma
3975 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3976 const arelent *rel ATTRIBUTE_UNUSED)
3977 {
3978 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3979 }
3980
3981 /* Merge backend specific data from an object file to the output
3982 object file when linking. */
3983
3984 static bfd_boolean
3985 elf32_s390_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
3986 {
3987 bfd *obfd = info->output_bfd;
3988
3989 if (!is_s390_elf (ibfd) || !is_s390_elf (obfd))
3990 return TRUE;
3991
3992 if (!elf_s390_merge_obj_attributes (ibfd, info))
3993 return FALSE;
3994
3995 elf_elfheader (obfd)->e_flags |= elf_elfheader (ibfd)->e_flags;
3996 return TRUE;
3997 }
3998
3999
4000 #define TARGET_BIG_SYM s390_elf32_vec
4001 #define TARGET_BIG_NAME "elf32-s390"
4002 #define ELF_ARCH bfd_arch_s390
4003 #define ELF_TARGET_ID S390_ELF_DATA
4004 #define ELF_MACHINE_CODE EM_S390
4005 #define ELF_MACHINE_ALT1 EM_S390_OLD
4006 #define ELF_MAXPAGESIZE 0x1000
4007
4008 #define elf_backend_can_gc_sections 1
4009 #define elf_backend_can_refcount 1
4010 #define elf_backend_want_got_plt 1
4011 #define elf_backend_plt_readonly 1
4012 #define elf_backend_want_plt_sym 0
4013 #define elf_backend_got_header_size 12
4014 #define elf_backend_want_dynrelro 1
4015 #define elf_backend_rela_normal 1
4016
4017 #define elf_info_to_howto elf_s390_info_to_howto
4018
4019 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
4020 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
4021 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
4022 #define bfd_elf32_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
4023
4024 #define bfd_elf32_bfd_merge_private_bfd_data elf32_s390_merge_private_bfd_data
4025
4026 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
4027 #define elf_backend_check_relocs elf_s390_check_relocs
4028 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
4029 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4030 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
4031 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
4032 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
4033 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
4034 #define elf_backend_relocate_section elf_s390_relocate_section
4035 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
4036 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4037 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
4038 #define elf_backend_grok_psinfo elf_s390_grok_psinfo
4039 #define elf_backend_write_core_note elf_s390_write_core_note
4040 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
4041 #define elf_backend_sort_relocs_p elf_s390_elf_sort_relocs_p
4042
4043 #define bfd_elf32_mkobject elf_s390_mkobject
4044 #define elf_backend_object_p elf_s390_object_p
4045
4046 #define elf_backend_linux_prpsinfo32_ugid16 TRUE
4047
4048 #include "elf32-target.h"
GDB Binutils - Deliverables
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