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S/390: ifunc: Fix function pointers to hidden ifunc symbols.
[deliverable/binutils-gdb.git] / bfd / elf32-s390.c
1 /* IBM S/390-specific support for 32-bit ELF
2 Copyright (C) 2000-2015 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
29 static bfd_reloc_status_type
30 s390_tls_reloc (bfd *, arelent *, asymbol *, void *,
31 asection *, bfd *, char **);
32 static bfd_reloc_status_type
33 s390_elf_ldisp_reloc (bfd *, arelent *, asymbol *, void *,
34 asection *, bfd *, char **);
35
36 /* The relocation "howto" table. */
37
38 static reloc_howto_type elf_howto_table[] =
39 {
40 HOWTO (R_390_NONE, /* type */
41 0, /* rightshift */
42 3, /* size (0 = byte, 1 = 2 byte, 2 = 4 byte) */
43 0, /* bitsize */
44 FALSE, /* pc_relative */
45 0, /* bitpos */
46 complain_overflow_dont, /* complain_on_overflow */
47 bfd_elf_generic_reloc, /* special_function */
48 "R_390_NONE", /* name */
49 FALSE, /* partial_inplace */
50 0, /* src_mask */
51 0, /* dst_mask */
52 FALSE), /* pcrel_offset */
53
54 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
55 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
56 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
57 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
58 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
60 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
62 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
63 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
64 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
66 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
68 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
69 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
70 HOWTO(R_390_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
71 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,0xffffffff, FALSE),
72 HOWTO(R_390_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
73 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,0xffffffff, FALSE),
74 HOWTO(R_390_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
75 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,0xffffffff, FALSE),
76 HOWTO(R_390_RELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
77 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,0xffffffff, FALSE),
78 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
79 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,0xffffffff, FALSE),
80 HOWTO(R_390_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
81 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,0xffffffff, TRUE),
82 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
84 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
86 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
88 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
90 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
91 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
92 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
94 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,0xffffffff, TRUE),
96 EMPTY_HOWTO (R_390_64), /* Empty entry for R_390_64. */
97 EMPTY_HOWTO (R_390_PC64), /* Empty entry for R_390_PC64. */
98 EMPTY_HOWTO (R_390_GOT64), /* Empty entry for R_390_GOT64. */
99 EMPTY_HOWTO (R_390_PLT64), /* Empty entry for R_390_PLT64. */
100 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,0xffffffff, TRUE),
102 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
103 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
104 EMPTY_HOWTO (R_390_GOTOFF64), /* Empty entry for R_390_GOTOFF64. */
105 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
106 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
107 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
109 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
110 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
111 EMPTY_HOWTO (R_390_GOTPLT64), /* Empty entry for R_390_GOTPLT64. */
112 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
113 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,0xffffffff, TRUE),
114 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
115 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
116 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
118 EMPTY_HOWTO (R_390_PLTOFF64), /* Empty entry for R_390_PLTOFF64. */
119 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont,
120 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE),
121 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
122 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE),
123 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
124 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE),
125 HOWTO(R_390_TLS_GD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_390_TLS_GD32", FALSE, 0, 0xffffffff, FALSE),
127 EMPTY_HOWTO (R_390_TLS_GD64), /* Empty entry for R_390_TLS_GD64. */
128 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
129 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE),
130 HOWTO(R_390_TLS_GOTIE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_390_TLS_GOTIE32", FALSE, 0, 0xffffffff, FALSE),
132 EMPTY_HOWTO (R_390_TLS_GOTIE64), /* Empty entry for R_390_TLS_GOTIE64. */
133 HOWTO(R_390_TLS_LDM32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
134 bfd_elf_generic_reloc, "R_390_TLS_LDM32", FALSE, 0, 0xffffffff, FALSE),
135 EMPTY_HOWTO (R_390_TLS_LDM64), /* Empty entry for R_390_TLS_LDM64. */
136 HOWTO(R_390_TLS_IE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
137 bfd_elf_generic_reloc, "R_390_TLS_IE32", FALSE, 0, 0xffffffff, FALSE),
138 EMPTY_HOWTO (R_390_TLS_IE64), /* Empty entry for R_390_TLS_IE64. */
139 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
140 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, 0xffffffff, TRUE),
141 HOWTO(R_390_TLS_LE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
142 bfd_elf_generic_reloc, "R_390_TLS_LE32", FALSE, 0, 0xffffffff, FALSE),
143 EMPTY_HOWTO (R_390_TLS_LE64), /* Empty entry for R_390_TLS_LE64. */
144 HOWTO(R_390_TLS_LDO32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_390_TLS_LDO32", FALSE, 0, 0xffffffff, FALSE),
146 EMPTY_HOWTO (R_390_TLS_LDO64), /* Empty entry for R_390_TLS_LDO64. */
147 HOWTO(R_390_TLS_DTPMOD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
148 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, 0xffffffff, FALSE),
149 HOWTO(R_390_TLS_DTPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
150 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, 0xffffffff, FALSE),
151 HOWTO(R_390_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
152 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, 0xffffffff, FALSE),
153 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
154 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE),
155 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
156 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE),
157 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
158 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE),
159 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
160 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE),
161 HOWTO(R_390_IRELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
162 bfd_elf_generic_reloc, "R_390_IRELATIVE", FALSE, 0, 0xffffffff, FALSE),
163 HOWTO(R_390_PC12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield,
164 bfd_elf_generic_reloc, "R_390_PC12DBL", FALSE, 0,0x00000fff, TRUE),
165 HOWTO(R_390_PLT12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield,
166 bfd_elf_generic_reloc, "R_390_PLT12DBL", FALSE, 0,0x00000fff, TRUE),
167 HOWTO(R_390_PC24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield,
168 bfd_elf_generic_reloc, "R_390_PC24DBL", FALSE, 0,0x00ffffff, TRUE),
169 HOWTO(R_390_PLT24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield,
170 bfd_elf_generic_reloc, "R_390_PLT24DBL", FALSE, 0,0x00ffffff, TRUE),
171 };
172
173 /* GNU extension to record C++ vtable hierarchy. */
174 static reloc_howto_type elf32_s390_vtinherit_howto =
175 HOWTO (R_390_GNU_VTINHERIT, 0,2,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
176 static reloc_howto_type elf32_s390_vtentry_howto =
177 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);
178
179 static reloc_howto_type *
180 elf_s390_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
181 bfd_reloc_code_real_type code)
182 {
183 switch (code)
184 {
185 case BFD_RELOC_NONE:
186 return &elf_howto_table[(int) R_390_NONE];
187 case BFD_RELOC_8:
188 return &elf_howto_table[(int) R_390_8];
189 case BFD_RELOC_390_12:
190 return &elf_howto_table[(int) R_390_12];
191 case BFD_RELOC_16:
192 return &elf_howto_table[(int) R_390_16];
193 case BFD_RELOC_32:
194 return &elf_howto_table[(int) R_390_32];
195 case BFD_RELOC_CTOR:
196 return &elf_howto_table[(int) R_390_32];
197 case BFD_RELOC_32_PCREL:
198 return &elf_howto_table[(int) R_390_PC32];
199 case BFD_RELOC_390_GOT12:
200 return &elf_howto_table[(int) R_390_GOT12];
201 case BFD_RELOC_32_GOT_PCREL:
202 return &elf_howto_table[(int) R_390_GOT32];
203 case BFD_RELOC_390_PLT32:
204 return &elf_howto_table[(int) R_390_PLT32];
205 case BFD_RELOC_390_COPY:
206 return &elf_howto_table[(int) R_390_COPY];
207 case BFD_RELOC_390_GLOB_DAT:
208 return &elf_howto_table[(int) R_390_GLOB_DAT];
209 case BFD_RELOC_390_JMP_SLOT:
210 return &elf_howto_table[(int) R_390_JMP_SLOT];
211 case BFD_RELOC_390_RELATIVE:
212 return &elf_howto_table[(int) R_390_RELATIVE];
213 case BFD_RELOC_32_GOTOFF:
214 return &elf_howto_table[(int) R_390_GOTOFF32];
215 case BFD_RELOC_390_GOTPC:
216 return &elf_howto_table[(int) R_390_GOTPC];
217 case BFD_RELOC_390_GOT16:
218 return &elf_howto_table[(int) R_390_GOT16];
219 case BFD_RELOC_16_PCREL:
220 return &elf_howto_table[(int) R_390_PC16];
221 case BFD_RELOC_390_PC12DBL:
222 return &elf_howto_table[(int) R_390_PC12DBL];
223 case BFD_RELOC_390_PLT12DBL:
224 return &elf_howto_table[(int) R_390_PLT12DBL];
225 case BFD_RELOC_390_PC16DBL:
226 return &elf_howto_table[(int) R_390_PC16DBL];
227 case BFD_RELOC_390_PLT16DBL:
228 return &elf_howto_table[(int) R_390_PLT16DBL];
229 case BFD_RELOC_390_PC24DBL:
230 return &elf_howto_table[(int) R_390_PC24DBL];
231 case BFD_RELOC_390_PLT24DBL:
232 return &elf_howto_table[(int) R_390_PLT24DBL];
233 case BFD_RELOC_390_PC32DBL:
234 return &elf_howto_table[(int) R_390_PC32DBL];
235 case BFD_RELOC_390_PLT32DBL:
236 return &elf_howto_table[(int) R_390_PLT32DBL];
237 case BFD_RELOC_390_GOTPCDBL:
238 return &elf_howto_table[(int) R_390_GOTPCDBL];
239 case BFD_RELOC_390_GOTENT:
240 return &elf_howto_table[(int) R_390_GOTENT];
241 case BFD_RELOC_16_GOTOFF:
242 return &elf_howto_table[(int) R_390_GOTOFF16];
243 case BFD_RELOC_390_GOTPLT12:
244 return &elf_howto_table[(int) R_390_GOTPLT12];
245 case BFD_RELOC_390_GOTPLT16:
246 return &elf_howto_table[(int) R_390_GOTPLT16];
247 case BFD_RELOC_390_GOTPLT32:
248 return &elf_howto_table[(int) R_390_GOTPLT32];
249 case BFD_RELOC_390_GOTPLTENT:
250 return &elf_howto_table[(int) R_390_GOTPLTENT];
251 case BFD_RELOC_390_PLTOFF16:
252 return &elf_howto_table[(int) R_390_PLTOFF16];
253 case BFD_RELOC_390_PLTOFF32:
254 return &elf_howto_table[(int) R_390_PLTOFF32];
255 case BFD_RELOC_390_TLS_LOAD:
256 return &elf_howto_table[(int) R_390_TLS_LOAD];
257 case BFD_RELOC_390_TLS_GDCALL:
258 return &elf_howto_table[(int) R_390_TLS_GDCALL];
259 case BFD_RELOC_390_TLS_LDCALL:
260 return &elf_howto_table[(int) R_390_TLS_LDCALL];
261 case BFD_RELOC_390_TLS_GD32:
262 return &elf_howto_table[(int) R_390_TLS_GD32];
263 case BFD_RELOC_390_TLS_GOTIE12:
264 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
265 case BFD_RELOC_390_TLS_GOTIE32:
266 return &elf_howto_table[(int) R_390_TLS_GOTIE32];
267 case BFD_RELOC_390_TLS_LDM32:
268 return &elf_howto_table[(int) R_390_TLS_LDM32];
269 case BFD_RELOC_390_TLS_IE32:
270 return &elf_howto_table[(int) R_390_TLS_IE32];
271 case BFD_RELOC_390_TLS_IEENT:
272 return &elf_howto_table[(int) R_390_TLS_IEENT];
273 case BFD_RELOC_390_TLS_LE32:
274 return &elf_howto_table[(int) R_390_TLS_LE32];
275 case BFD_RELOC_390_TLS_LDO32:
276 return &elf_howto_table[(int) R_390_TLS_LDO32];
277 case BFD_RELOC_390_TLS_DTPMOD:
278 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
279 case BFD_RELOC_390_TLS_DTPOFF:
280 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
281 case BFD_RELOC_390_TLS_TPOFF:
282 return &elf_howto_table[(int) R_390_TLS_TPOFF];
283 case BFD_RELOC_390_20:
284 return &elf_howto_table[(int) R_390_20];
285 case BFD_RELOC_390_GOT20:
286 return &elf_howto_table[(int) R_390_GOT20];
287 case BFD_RELOC_390_GOTPLT20:
288 return &elf_howto_table[(int) R_390_GOTPLT20];
289 case BFD_RELOC_390_TLS_GOTIE20:
290 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
291 case BFD_RELOC_390_IRELATIVE:
292 return &elf_howto_table[(int) R_390_IRELATIVE];
293 case BFD_RELOC_VTABLE_INHERIT:
294 return &elf32_s390_vtinherit_howto;
295 case BFD_RELOC_VTABLE_ENTRY:
296 return &elf32_s390_vtentry_howto;
297 default:
298 break;
299 }
300 return 0;
301 }
302
303 static reloc_howto_type *
304 elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
305 const char *r_name)
306 {
307 unsigned int i;
308
309 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
310 if (elf_howto_table[i].name != NULL
311 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
312 return &elf_howto_table[i];
313
314 if (strcasecmp (elf32_s390_vtinherit_howto.name, r_name) == 0)
315 return &elf32_s390_vtinherit_howto;
316 if (strcasecmp (elf32_s390_vtentry_howto.name, r_name) == 0)
317 return &elf32_s390_vtentry_howto;
318
319 return NULL;
320 }
321
322 /* We need to use ELF32_R_TYPE so we have our own copy of this function,
323 and elf32-s390.c has its own copy. */
324
325 static void
326 elf_s390_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
327 arelent *cache_ptr,
328 Elf_Internal_Rela *dst)
329 {
330 unsigned int r_type = ELF32_R_TYPE(dst->r_info);
331 switch (r_type)
332 {
333 case R_390_GNU_VTINHERIT:
334 cache_ptr->howto = &elf32_s390_vtinherit_howto;
335 break;
336
337 case R_390_GNU_VTENTRY:
338 cache_ptr->howto = &elf32_s390_vtentry_howto;
339 break;
340
341 default:
342 if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
343 {
344 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
345 abfd, (int) r_type);
346 r_type = R_390_NONE;
347 }
348 cache_ptr->howto = &elf_howto_table[r_type];
349 }
350 }
351
352 /* A relocation function which doesn't do anything. */
353 static bfd_reloc_status_type
354 s390_tls_reloc (bfd *abfd ATTRIBUTE_UNUSED,
355 arelent *reloc_entry,
356 asymbol *symbol ATTRIBUTE_UNUSED,
357 void * data ATTRIBUTE_UNUSED,
358 asection *input_section,
359 bfd *output_bfd,
360 char **error_message ATTRIBUTE_UNUSED)
361 {
362 if (output_bfd)
363 reloc_entry->address += input_section->output_offset;
364 return bfd_reloc_ok;
365 }
366
367 /* Handle the large displacement relocs. */
368 static bfd_reloc_status_type
369 s390_elf_ldisp_reloc (bfd *abfd ATTRIBUTE_UNUSED,
370 arelent *reloc_entry,
371 asymbol *symbol,
372 void * data ATTRIBUTE_UNUSED,
373 asection *input_section,
374 bfd *output_bfd,
375 char **error_message ATTRIBUTE_UNUSED)
376 {
377 reloc_howto_type *howto = reloc_entry->howto;
378 bfd_vma relocation;
379 bfd_vma insn;
380
381 if (output_bfd != (bfd *) NULL
382 && (symbol->flags & BSF_SECTION_SYM) == 0
383 && (! howto->partial_inplace
384 || reloc_entry->addend == 0))
385 {
386 reloc_entry->address += input_section->output_offset;
387 return bfd_reloc_ok;
388 }
389
390 if (output_bfd != NULL)
391 return bfd_reloc_continue;
392
393 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
394 return bfd_reloc_outofrange;
395
396 relocation = (symbol->value
397 + symbol->section->output_section->vma
398 + symbol->section->output_offset);
399 relocation += reloc_entry->addend;
400 if (howto->pc_relative)
401 {
402 relocation -= (input_section->output_section->vma
403 + input_section->output_offset);
404 relocation -= reloc_entry->address;
405 }
406
407 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
408 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
409 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
410
411 if ((bfd_signed_vma) relocation < - 0x80000
412 || (bfd_signed_vma) relocation > 0x7ffff)
413 return bfd_reloc_overflow;
414 else
415 return bfd_reloc_ok;
416 }
417
418 static bfd_boolean
419 elf_s390_is_local_label_name (bfd *abfd, const char *name)
420 {
421 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
422 return TRUE;
423
424 return _bfd_elf_is_local_label_name (abfd, name);
425 }
426
427 /* Functions for the 390 ELF linker. */
428
429 /* The name of the dynamic interpreter. This is put in the .interp
430 section. */
431
432 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1"
433
434 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
435 copying dynamic variables from a shared lib into an app's dynbss
436 section, and instead use a dynamic relocation to point into the
437 shared lib. */
438 #define ELIMINATE_COPY_RELOCS 1
439
440 /* The size in bytes of the first entry in the procedure linkage table. */
441 #define PLT_FIRST_ENTRY_SIZE 32
442 /* The size in bytes of an entry in the procedure linkage table. */
443 #define PLT_ENTRY_SIZE 32
444
445 #define GOT_ENTRY_SIZE 4
446
447 #define RELA_ENTRY_SIZE sizeof (Elf32_External_Rela)
448
449 /* The first three entries in a procedure linkage table are reserved,
450 and the initial contents are unimportant (we zero them out).
451 Subsequent entries look like this. See the SVR4 ABI 386
452 supplement to see how this works. */
453
454 /* For the s390, simple addr offset can only be 0 - 4096.
455 To use the full 2 GB address space, several instructions
456 are needed to load an address in a register and execute
457 a branch( or just saving the address)
458
459 Furthermore, only r 0 and 1 are free to use!!! */
460
461 /* The first 3 words in the GOT are then reserved.
462 Word 0 is the address of the dynamic table.
463 Word 1 is a pointer to a structure describing the object
464 Word 2 is used to point to the loader entry address.
465
466 The code for position independent PLT entries looks like this:
467
468 r12 holds addr of the current GOT at entry to the PLT
469
470 The GOT holds the address in the PLT to be executed.
471 The loader then gets:
472 24(15) = Pointer to the structure describing the object.
473 28(15) = Offset into rela.plt
474
475 The loader must then find the module where the function is
476 and insert the address in the GOT.
477
478 Note: 390 can only address +- 64 K relative.
479 We check if offset > 65536, then make a relative branch -64xxx
480 back to a previous defined branch
481
482 PLT1: BASR 1,0 # 2 bytes
483 L 1,22(1) # 4 bytes Load offset in GOT in r 1
484 L 1,(1,12) # 4 bytes Load address from GOT in r1
485 BCR 15,1 # 2 bytes Jump to address
486 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
487 L 1,14(1) # 4 bytes Load offset in symol table in r1
488 BRC 15,-x # 4 bytes Jump to start of PLT
489 .word 0 # 2 bytes filler
490 .long ? # 4 bytes offset in GOT
491 .long ? # 4 bytes offset into rela.plt
492
493 This was the general case. There are two additional, optimizes PLT
494 definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768.
495 First the one for GOT offsets < 4096:
496
497 PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1
498 BCR 15,1 # 2 bytes Jump to address
499 .word 0,0,0 # 6 bytes filler
500 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
501 L 1,14(1) # 4 bytes Load offset in rela.plt in r1
502 BRC 15,-x # 4 bytes Jump to start of PLT
503 .word 0,0,0 # 6 bytes filler
504 .long ? # 4 bytes offset into rela.plt
505
506 Second the one for GOT offsets < 32768:
507
508 PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1
509 L 1,(1,12) # 4 bytes Load address from GOT to r1
510 BCR 15,1 # 2 bytes Jump to address
511 .word 0 # 2 bytes filler
512 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
513 L 1,14(1) # 4 bytes Load offset in rela.plt in r1
514 BRC 15,-x # 4 bytes Jump to start of PLT
515 .word 0,0,0 # 6 bytes filler
516 .long ? # 4 bytes offset into rela.plt
517
518 Total = 32 bytes per PLT entry
519
520 The code for static build PLT entries looks like this:
521
522 PLT1: BASR 1,0 # 2 bytes
523 L 1,22(1) # 4 bytes Load address of GOT entry
524 L 1,0(0,1) # 4 bytes Load address from GOT in r1
525 BCR 15,1 # 2 bytes Jump to address
526 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
527 L 1,14(1) # 4 bytes Load offset in symbol table in r1
528 BRC 15,-x # 4 bytes Jump to start of PLT
529 .word 0 # 2 bytes filler
530 .long ? # 4 bytes address of GOT entry
531 .long ? # 4 bytes offset into rela.plt */
532
533 static const bfd_byte elf_s390_plt_entry[PLT_ENTRY_SIZE] =
534 {
535 0x0d, 0x10, /* basr %r1,%r0 */
536 0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */
537 0x58, 0x10, 0x10, 0x00, /* l %r1,0(%r1) */
538 0x07, 0xf1, /* br %r1 */
539 0x0d, 0x10, /* basr %r1,%r0 */
540 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
541 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
542 0x00, 0x00, /* padding */
543 0x00, 0x00, 0x00, 0x00, /* GOT offset */
544 0x00, 0x00, 0x00, 0x00 /* rela.plt offset */
545 };
546
547 /* Generic PLT pic entry. */
548 static const bfd_byte elf_s390_plt_pic_entry[PLT_ENTRY_SIZE] =
549 {
550 0x0d, 0x10, /* basr %r1,%r0 */
551 0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */
552 0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */
553 0x07, 0xf1, /* br %r1 */
554 0x0d, 0x10, /* basr %r1,%r0 */
555 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
556 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
557 0x00, 0x00, /* padding */
558 0x00, 0x00, 0x00, 0x00, /* GOT offset */
559 0x00, 0x00, 0x00, 0x00 /* rela.plt offset */
560 };
561
562 /* Optimized PLT pic entry for GOT offset < 4k. xx will be replaced
563 when generating the PLT slot with the GOT offset. */
564 static const bfd_byte elf_s390_plt_pic12_entry[PLT_ENTRY_SIZE] =
565 {
566 0x58, 0x10, 0xc0, 0x00, /* l %r1,xx(%r12) */
567 0x07, 0xf1, /* br %r1 */
568 0x00, 0x00, 0x00, 0x00, /* padding */
569 0x00, 0x00,
570 0x0d, 0x10, /* basr %r1,%r0 */
571 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
572 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
573 0x00, 0x00, 0x00, 0x00,
574 0x00, 0x00, 0x00, 0x00
575 };
576
577 /* Optimized PLT pic entry for GOT offset < 32k. xx will be replaced
578 when generating the PLT slot with the GOT offset. */
579 static const bfd_byte elf_s390_plt_pic16_entry[PLT_ENTRY_SIZE] =
580 {
581 0xa7, 0x18, 0x00, 0x00, /* lhi %r1,xx */
582 0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */
583 0x07, 0xf1, /* br %r1 */
584 0x00, 0x00,
585 0x0d, 0x10, /* basr %r1,%r0 */
586 0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
587 0xa7, 0xf4, 0x00, 0x00, /* j first plt */
588 0x00, 0x00, 0x00, 0x00,
589 0x00, 0x00, 0x00, 0x00,
590 0x00, 0x00
591 };
592
593 /* The first PLT entry pushes the offset into the rela.plt
594 from R1 onto the stack at 8(15) and the loader object info
595 at 12(15), loads the loader address in R1 and jumps to it. */
596
597 /* The first entry in the PLT for PIC code:
598
599 PLT0:
600 ST 1,28(15) # R1 has offset into rela.plt
601 L 1,4(12) # Get loader ino(object struct address)
602 ST 1,24(15) # Store address
603 L 1,8(12) # Entry address of loader in R1
604 BR 1 # Jump to loader
605
606 The first entry in the PLT for static code:
607
608 PLT0:
609 ST 1,28(15) # R1 has offset into rela.plt
610 BASR 1,0
611 L 1,18(0,1) # Get address of GOT
612 MVC 24(4,15),4(1) # Move loader ino to stack
613 L 1,8(1) # Get address of loader
614 BR 1 # Jump to loader
615 .word 0 # filler
616 .long got # address of GOT */
617
618 static const bfd_byte elf_s390_plt_first_entry[PLT_FIRST_ENTRY_SIZE] =
619 {
620 0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */
621 0x0d, 0x10, /* basr %r1,%r0 */
622 0x58, 0x10, 0x10, 0x12, /* l %r1,18(%r1) */
623 0xd2, 0x03, 0xf0, 0x18, 0x10, 0x04, /* mvc 24(4,%r15),4(%r1) */
624 0x58, 0x10, 0x10, 0x08, /* l %r1,8(%r1) */
625 0x07, 0xf1, /* br %r1 */
626 0x00, 0x00, 0x00, 0x00,
627 0x00, 0x00, 0x00, 0x00,
628 0x00, 0x00
629 };
630
631 static const bfd_byte elf_s390_plt_pic_first_entry[PLT_FIRST_ENTRY_SIZE] =
632 {
633 0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */
634 0x58, 0x10, 0xc0, 0x04, /* l %r1,4(%r12) */
635 0x50, 0x10, 0xf0, 0x18, /* st %r1,24(%r15) */
636 0x58, 0x10, 0xc0, 0x08, /* l %r1,8(%r12) */
637 0x07, 0xf1, /* br %r1 */
638 0x00, 0x00, 0x00, 0x00,
639 0x00, 0x00, 0x00, 0x00,
640 0x00, 0x00, 0x00, 0x00,
641 0x00, 0x00
642 };
643
644
645 /* s390 ELF linker hash entry. */
646
647 struct elf_s390_link_hash_entry
648 {
649 struct elf_link_hash_entry elf;
650
651 /* Track dynamic relocs copied for this symbol. */
652 struct elf_dyn_relocs *dyn_relocs;
653
654 /* Number of GOTPLT references for a function. */
655 bfd_signed_vma gotplt_refcount;
656
657 #define GOT_UNKNOWN 0
658 #define GOT_NORMAL 1
659 #define GOT_TLS_GD 2
660 #define GOT_TLS_IE 3
661 #define GOT_TLS_IE_NLT 4
662 unsigned char tls_type;
663
664 /* For pointer equality reasons we might need to change the symbol
665 type from STT_GNU_IFUNC to STT_FUNC together with its value and
666 section entry. So after alloc_dynrelocs only these values should
667 be used. In order to check whether a symbol is IFUNC use
668 s390_is_ifunc_symbol_p. */
669 bfd_vma ifunc_resolver_address;
670 asection *ifunc_resolver_section;
671 };
672
673 #define elf_s390_hash_entry(ent) \
674 ((struct elf_s390_link_hash_entry *)(ent))
675
676 /* This structure represents an entry in the local PLT list needed for
677 local IFUNC symbols. */
678 struct plt_entry
679 {
680 /* The section of the local symbol.
681 Set in relocate_section and used in finish_dynamic_sections. */
682 asection *sec;
683
684 union
685 {
686 bfd_signed_vma refcount;
687 bfd_vma offset;
688 } plt;
689 };
690
691 /* NOTE: Keep this structure in sync with
692 the one declared in elf64-s390.c. */
693 struct elf_s390_obj_tdata
694 {
695 struct elf_obj_tdata root;
696
697 /* A local PLT is needed for ifunc symbols. */
698 struct plt_entry *local_plt;
699
700 /* TLS type for each local got entry. */
701 char *local_got_tls_type;
702 };
703
704 #define elf_s390_tdata(abfd) \
705 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
706
707 #define elf_s390_local_plt(abfd) \
708 (elf_s390_tdata (abfd)->local_plt)
709
710 #define elf_s390_local_got_tls_type(abfd) \
711 (elf_s390_tdata (abfd)->local_got_tls_type)
712
713 #define is_s390_elf(bfd) \
714 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
715 && elf_tdata (bfd) != NULL \
716 && elf_object_id (bfd) == S390_ELF_DATA)
717
718 static bfd_boolean
719 elf_s390_mkobject (bfd *abfd)
720 {
721 return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata),
722 S390_ELF_DATA);
723 }
724
725 static bfd_boolean
726 elf_s390_object_p (bfd *abfd)
727 {
728 /* Set the right machine number for an s390 elf32 file. */
729 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31);
730 }
731
732 /* s390 ELF linker hash table. */
733
734 struct elf_s390_link_hash_table
735 {
736 struct elf_link_hash_table elf;
737
738 /* Short-cuts to get to dynamic linker sections. */
739 asection *sdynbss;
740 asection *srelbss;
741 asection *irelifunc;
742
743 union
744 {
745 bfd_signed_vma refcount;
746 bfd_vma offset;
747 } tls_ldm_got;
748
749 /* Small local sym cache. */
750 struct sym_cache sym_cache;
751 };
752
753 /* Get the s390 ELF linker hash table from a link_info structure. */
754
755 #define elf_s390_hash_table(p) \
756 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
757 == S390_ELF_DATA ? ((struct elf_s390_link_hash_table *) ((p)->hash)) : NULL)
758
759 #undef ELF64
760 #include "elf-s390-common.c"
761
762 /* Create an entry in an s390 ELF linker hash table. */
763
764 static struct bfd_hash_entry *
765 link_hash_newfunc (struct bfd_hash_entry *entry,
766 struct bfd_hash_table *table,
767 const char *string)
768 {
769 /* Allocate the structure if it has not already been allocated by a
770 subclass. */
771 if (entry == NULL)
772 {
773 entry = bfd_hash_allocate (table,
774 sizeof (struct elf_s390_link_hash_entry));
775 if (entry == NULL)
776 return entry;
777 }
778
779 /* Call the allocation method of the superclass. */
780 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
781 if (entry != NULL)
782 {
783 struct elf_s390_link_hash_entry *eh;
784
785 eh = (struct elf_s390_link_hash_entry *) entry;
786 eh->dyn_relocs = NULL;
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 bfd_size_type 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 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
820 shortcuts to them in our hash table. */
821
822 static bfd_boolean
823 create_got_section (bfd *dynobj, struct bfd_link_info *info)
824 {
825 struct elf_s390_link_hash_table *htab;
826
827 if (! _bfd_elf_create_got_section (dynobj, info))
828 return FALSE;
829
830 htab = elf_s390_hash_table (info);
831 htab->elf.sgot = bfd_get_linker_section (dynobj, ".got");
832 htab->elf.sgotplt = bfd_get_linker_section (dynobj, ".got.plt");
833 htab->elf.srelgot = bfd_get_linker_section (dynobj, ".rela.got");
834 if (!htab->elf.sgot || !htab->elf.sgotplt || !htab->elf.srelgot)
835 abort ();
836
837 return TRUE;
838 }
839
840 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
841 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
842 hash table. */
843
844 static bfd_boolean
845 elf_s390_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
846 {
847 struct elf_s390_link_hash_table *htab;
848
849 htab = elf_s390_hash_table (info);
850 if (!htab->elf.sgot && !create_got_section (dynobj, info))
851 return FALSE;
852
853 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
854 return FALSE;
855
856 htab->elf.splt = bfd_get_linker_section (dynobj, ".plt");
857 htab->elf.srelplt = bfd_get_linker_section (dynobj, ".rela.plt");
858 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
859 if (!bfd_link_pic (info))
860 htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss");
861
862 if (!htab->elf.splt || !htab->elf.srelplt || !htab->sdynbss
863 || (!bfd_link_pic (info) && !htab->srelbss))
864 abort ();
865
866 return TRUE;
867 }
868
869 /* Copy the extra info we tack onto an elf_link_hash_entry. */
870
871 static void
872 elf_s390_copy_indirect_symbol (struct bfd_link_info *info,
873 struct elf_link_hash_entry *dir,
874 struct elf_link_hash_entry *ind)
875 {
876 struct elf_s390_link_hash_entry *edir, *eind;
877
878 edir = (struct elf_s390_link_hash_entry *) dir;
879 eind = (struct elf_s390_link_hash_entry *) ind;
880
881 if (eind->dyn_relocs != NULL)
882 {
883 if (edir->dyn_relocs != NULL)
884 {
885 struct elf_dyn_relocs **pp;
886 struct elf_dyn_relocs *p;
887
888 /* Add reloc counts against the indirect sym to the direct sym
889 list. Merge any entries against the same section. */
890 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
891 {
892 struct elf_dyn_relocs *q;
893
894 for (q = edir->dyn_relocs; q != NULL; q = q->next)
895 if (q->sec == p->sec)
896 {
897 q->pc_count += p->pc_count;
898 q->count += p->count;
899 *pp = p->next;
900 break;
901 }
902 if (q == NULL)
903 pp = &p->next;
904 }
905 *pp = edir->dyn_relocs;
906 }
907
908 edir->dyn_relocs = eind->dyn_relocs;
909 eind->dyn_relocs = NULL;
910 }
911
912 if (ind->root.type == bfd_link_hash_indirect
913 && dir->got.refcount <= 0)
914 {
915 edir->tls_type = eind->tls_type;
916 eind->tls_type = GOT_UNKNOWN;
917 }
918
919 if (ELIMINATE_COPY_RELOCS
920 && ind->root.type != bfd_link_hash_indirect
921 && dir->dynamic_adjusted)
922 {
923 /* If called to transfer flags for a weakdef during processing
924 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
925 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
926 dir->ref_dynamic |= ind->ref_dynamic;
927 dir->ref_regular |= ind->ref_regular;
928 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
929 dir->needs_plt |= ind->needs_plt;
930 }
931 else
932 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
933 }
934
935 static int
936 elf_s390_tls_transition (struct bfd_link_info *info,
937 int r_type,
938 int is_local)
939 {
940 if (bfd_link_pic (info))
941 return r_type;
942
943 switch (r_type)
944 {
945 case R_390_TLS_GD32:
946 case R_390_TLS_IE32:
947 if (is_local)
948 return R_390_TLS_LE32;
949 return R_390_TLS_IE32;
950 case R_390_TLS_GOTIE32:
951 if (is_local)
952 return R_390_TLS_LE32;
953 return R_390_TLS_GOTIE32;
954 case R_390_TLS_LDM32:
955 return R_390_TLS_LE32;
956 }
957
958 return r_type;
959 }
960
961 /* Look through the relocs for a section during the first phase, and
962 allocate space in the global offset table or procedure linkage
963 table. */
964
965 static bfd_boolean
966 elf_s390_check_relocs (bfd *abfd,
967 struct bfd_link_info *info,
968 asection *sec,
969 const Elf_Internal_Rela *relocs)
970 {
971 struct elf_s390_link_hash_table *htab;
972 Elf_Internal_Shdr *symtab_hdr;
973 struct elf_link_hash_entry **sym_hashes;
974 const Elf_Internal_Rela *rel;
975 const Elf_Internal_Rela *rel_end;
976 asection *sreloc;
977 bfd_signed_vma *local_got_refcounts;
978 int tls_type, old_tls_type;
979 Elf_Internal_Sym *isym;
980
981 if (bfd_link_relocatable (info))
982 return TRUE;
983
984 BFD_ASSERT (is_s390_elf (abfd));
985
986 htab = elf_s390_hash_table (info);
987 symtab_hdr = &elf_symtab_hdr (abfd);
988 sym_hashes = elf_sym_hashes (abfd);
989 local_got_refcounts = elf_local_got_refcounts (abfd);
990
991 sreloc = NULL;
992
993 rel_end = relocs + sec->reloc_count;
994 for (rel = relocs; rel < rel_end; rel++)
995 {
996 unsigned int r_type;
997 unsigned long r_symndx;
998 struct elf_link_hash_entry *h;
999
1000 r_symndx = ELF32_R_SYM (rel->r_info);
1001
1002 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1003 {
1004 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1005 abfd, r_symndx);
1006 return FALSE;
1007 }
1008
1009 if (r_symndx < symtab_hdr->sh_info)
1010 {
1011 /* A local symbol. */
1012 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1013 abfd, r_symndx);
1014 if (isym == NULL)
1015 return FALSE;
1016
1017 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1018 {
1019 struct plt_entry *plt;
1020
1021 if (htab->elf.dynobj == NULL)
1022 htab->elf.dynobj = abfd;
1023
1024 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
1025 return FALSE;
1026
1027 if (local_got_refcounts == NULL)
1028 {
1029 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
1030 return FALSE;
1031 local_got_refcounts = elf_local_got_refcounts (abfd);
1032 }
1033 plt = elf_s390_local_plt (abfd);
1034 plt[r_symndx].plt.refcount++;
1035 }
1036 h = NULL;
1037 }
1038 else
1039 {
1040 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1041 while (h->root.type == bfd_link_hash_indirect
1042 || h->root.type == bfd_link_hash_warning)
1043 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1044
1045 /* PR15323, ref flags aren't set for references in the same
1046 object. */
1047 h->root.non_ir_ref = 1;
1048 }
1049
1050 /* Create got section and local_got_refcounts array if they
1051 are needed. */
1052 r_type = elf_s390_tls_transition (info,
1053 ELF32_R_TYPE (rel->r_info),
1054 h == NULL);
1055 switch (r_type)
1056 {
1057 case R_390_GOT12:
1058 case R_390_GOT16:
1059 case R_390_GOT20:
1060 case R_390_GOT32:
1061 case R_390_GOTENT:
1062 case R_390_GOTPLT12:
1063 case R_390_GOTPLT16:
1064 case R_390_GOTPLT20:
1065 case R_390_GOTPLT32:
1066 case R_390_GOTPLTENT:
1067 case R_390_TLS_GD32:
1068 case R_390_TLS_GOTIE12:
1069 case R_390_TLS_GOTIE20:
1070 case R_390_TLS_GOTIE32:
1071 case R_390_TLS_IEENT:
1072 case R_390_TLS_IE32:
1073 case R_390_TLS_LDM32:
1074 if (h == NULL
1075 && local_got_refcounts == NULL)
1076 {
1077 if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
1078 return FALSE;
1079 local_got_refcounts = elf_local_got_refcounts (abfd);
1080 }
1081 /* Fall through. */
1082 case R_390_GOTOFF16:
1083 case R_390_GOTOFF32:
1084 case R_390_GOTPC:
1085 case R_390_GOTPCDBL:
1086 if (htab->elf.sgot == NULL)
1087 {
1088 if (htab->elf.dynobj == NULL)
1089 htab->elf.dynobj = abfd;
1090 if (!create_got_section (htab->elf.dynobj, info))
1091 return FALSE;
1092 }
1093 }
1094
1095 if (h != NULL)
1096 {
1097 if (htab->elf.dynobj == NULL)
1098 htab->elf.dynobj = abfd;
1099 if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
1100 return FALSE;
1101
1102 /* Make sure an IFUNC symbol defined in a non-shared object
1103 always gets a PLT slot. */
1104 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1105 {
1106 /* The symbol is called by the dynamic loader in order
1107 to resolve the relocation. So it is in fact also
1108 referenced. */
1109 h->ref_regular = 1;
1110 h->needs_plt = 1;
1111 }
1112 }
1113 switch (r_type)
1114 {
1115 case R_390_GOTPC:
1116 case R_390_GOTPCDBL:
1117 /* These relocs do not need a GOT slot. They just load the
1118 GOT pointer itself or address something else relative to
1119 the GOT. Since the GOT pointer has been set up above we
1120 are done. */
1121 break;
1122 case R_390_GOTOFF16:
1123 case R_390_GOTOFF32:
1124 if (h == NULL || !s390_is_ifunc_symbol_p (h) || !h->def_regular)
1125 break;
1126
1127 case R_390_PLT12DBL:
1128 case R_390_PLT16DBL:
1129 case R_390_PLT24DBL:
1130 case R_390_PLT32DBL:
1131 case R_390_PLT32:
1132 case R_390_PLTOFF16:
1133 case R_390_PLTOFF32:
1134 /* This symbol requires a procedure linkage table entry. We
1135 actually build the entry in adjust_dynamic_symbol,
1136 because this might be a case of linking PIC code which is
1137 never referenced by a dynamic object, in which case we
1138 don't need to generate a procedure linkage table entry
1139 after all. */
1140
1141 /* If this is a local symbol, we resolve it directly without
1142 creating a procedure linkage table entry. */
1143 if (h != NULL)
1144 {
1145 h->needs_plt = 1;
1146 h->plt.refcount += 1;
1147 }
1148 break;
1149
1150 case R_390_GOTPLT12:
1151 case R_390_GOTPLT16:
1152 case R_390_GOTPLT20:
1153 case R_390_GOTPLT32:
1154 case R_390_GOTPLTENT:
1155 /* This symbol requires either a procedure linkage table entry
1156 or an entry in the local got. We actually build the entry
1157 in adjust_dynamic_symbol because whether this is really a
1158 global reference can change and with it the fact if we have
1159 to create a plt entry or a local got entry. To be able to
1160 make a once global symbol a local one we have to keep track
1161 of the number of gotplt references that exist for this
1162 symbol. */
1163 if (h != NULL)
1164 {
1165 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1166 h->needs_plt = 1;
1167 h->plt.refcount += 1;
1168 }
1169 else
1170 local_got_refcounts[r_symndx] += 1;
1171 break;
1172
1173 case R_390_TLS_LDM32:
1174 htab->tls_ldm_got.refcount += 1;
1175 break;
1176
1177 case R_390_TLS_IE32:
1178 case R_390_TLS_GOTIE12:
1179 case R_390_TLS_GOTIE20:
1180 case R_390_TLS_GOTIE32:
1181 case R_390_TLS_IEENT:
1182 if (bfd_link_pic (info))
1183 info->flags |= DF_STATIC_TLS;
1184 /* Fall through. */
1185
1186 case R_390_GOT12:
1187 case R_390_GOT16:
1188 case R_390_GOT20:
1189 case R_390_GOT32:
1190 case R_390_GOTENT:
1191 case R_390_TLS_GD32:
1192 /* This symbol requires a global offset table entry. */
1193 switch (r_type)
1194 {
1195 default:
1196 case R_390_GOT12:
1197 case R_390_GOT16:
1198 case R_390_GOT20:
1199 case R_390_GOT32:
1200 case R_390_GOTENT:
1201 tls_type = GOT_NORMAL;
1202 break;
1203 case R_390_TLS_GD32:
1204 tls_type = GOT_TLS_GD;
1205 break;
1206 case R_390_TLS_IE32:
1207 case R_390_TLS_GOTIE32:
1208 tls_type = GOT_TLS_IE;
1209 break;
1210 case R_390_TLS_GOTIE12:
1211 case R_390_TLS_GOTIE20:
1212 case R_390_TLS_IEENT:
1213 tls_type = GOT_TLS_IE_NLT;
1214 break;
1215 }
1216
1217 if (h != NULL)
1218 {
1219 h->got.refcount += 1;
1220 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1221 }
1222 else
1223 {
1224 local_got_refcounts[r_symndx] += 1;
1225 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1226 }
1227 /* If a TLS symbol is accessed using IE at least once,
1228 there is no point to use dynamic model for it. */
1229 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1230 {
1231 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1232 {
1233 (*_bfd_error_handler)
1234 (_("%B: `%s' accessed both as normal and thread local symbol"),
1235 abfd, h->root.root.string);
1236 return FALSE;
1237 }
1238 if (old_tls_type > tls_type)
1239 tls_type = old_tls_type;
1240 }
1241
1242 if (old_tls_type != tls_type)
1243 {
1244 if (h != NULL)
1245 elf_s390_hash_entry (h)->tls_type = tls_type;
1246 else
1247 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1248 }
1249
1250 if (r_type != R_390_TLS_IE32)
1251 break;
1252 /* Fall through. */
1253
1254 case R_390_TLS_LE32:
1255 /* For static linking and executables this reloc will be
1256 calculated at linktime otherwise a TLS_TPOFF runtime
1257 reloc will be generated. */
1258 if (r_type == R_390_TLS_LE32 && bfd_link_pie (info))
1259 break;
1260
1261 if (!bfd_link_pic (info))
1262 break;
1263 info->flags |= DF_STATIC_TLS;
1264 /* Fall through. */
1265
1266 case R_390_8:
1267 case R_390_16:
1268 case R_390_32:
1269 case R_390_PC16:
1270 case R_390_PC12DBL:
1271 case R_390_PC16DBL:
1272 case R_390_PC24DBL:
1273 case R_390_PC32DBL:
1274 case R_390_PC32:
1275 if (h != NULL)
1276 {
1277 /* If this reloc is in a read-only section, we might
1278 need a copy reloc. We can't check reliably at this
1279 stage whether the section is read-only, as input
1280 sections have not yet been mapped to output sections.
1281 Tentatively set the flag for now, and correct in
1282 adjust_dynamic_symbol. */
1283 h->non_got_ref = 1;
1284
1285 if (!bfd_link_pic (info))
1286 {
1287 /* We may need a .plt entry if the function this reloc
1288 refers to is in a shared lib. */
1289 h->plt.refcount += 1;
1290 }
1291 }
1292
1293 /* If we are creating a shared library, and this is a reloc
1294 against a global symbol, or a non PC relative reloc
1295 against a local symbol, then we need to copy the reloc
1296 into the shared library. However, if we are linking with
1297 -Bsymbolic, we do not need to copy a reloc against a
1298 global symbol which is defined in an object we are
1299 including in the link (i.e., DEF_REGULAR is set). At
1300 this point we have not seen all the input files, so it is
1301 possible that DEF_REGULAR is not set now but will be set
1302 later (it is never cleared). In case of a weak definition,
1303 DEF_REGULAR may be cleared later by a strong definition in
1304 a shared library. We account for that possibility below by
1305 storing information in the relocs_copied field of the hash
1306 table entry. A similar situation occurs when creating
1307 shared libraries and symbol visibility changes render the
1308 symbol local.
1309
1310 If on the other hand, we are creating an executable, we
1311 may need to keep relocations for symbols satisfied by a
1312 dynamic library if we manage to avoid copy relocs for the
1313 symbol. */
1314 if ((bfd_link_pic (info)
1315 && (sec->flags & SEC_ALLOC) != 0
1316 && ((ELF32_R_TYPE (rel->r_info) != R_390_PC16
1317 && ELF32_R_TYPE (rel->r_info) != R_390_PC12DBL
1318 && ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL
1319 && ELF32_R_TYPE (rel->r_info) != R_390_PC24DBL
1320 && ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL
1321 && ELF32_R_TYPE (rel->r_info) != R_390_PC32)
1322 || (h != NULL
1323 && (! SYMBOLIC_BIND (info, h)
1324 || h->root.type == bfd_link_hash_defweak
1325 || !h->def_regular))))
1326 || (ELIMINATE_COPY_RELOCS
1327 && !bfd_link_pic (info)
1328 && (sec->flags & SEC_ALLOC) != 0
1329 && h != NULL
1330 && (h->root.type == bfd_link_hash_defweak
1331 || !h->def_regular)))
1332 {
1333 struct elf_dyn_relocs *p;
1334 struct elf_dyn_relocs **head;
1335
1336 /* We must copy these reloc types into the output file.
1337 Create a reloc section in dynobj and make room for
1338 this reloc. */
1339 if (sreloc == NULL)
1340 {
1341 if (htab->elf.dynobj == NULL)
1342 htab->elf.dynobj = abfd;
1343
1344 sreloc = _bfd_elf_make_dynamic_reloc_section
1345 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ TRUE);
1346
1347 if (sreloc == NULL)
1348 return FALSE;
1349 }
1350
1351 /* If this is a global symbol, we count the number of
1352 relocations we need for this symbol. */
1353 if (h != NULL)
1354 {
1355 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1356 }
1357 else
1358 {
1359 /* Track dynamic relocs needed for local syms too.
1360 We really need local syms available to do this
1361 easily. Oh well. */
1362 asection *s;
1363 void *vpp;
1364
1365 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1366 abfd, r_symndx);
1367 if (isym == NULL)
1368 return FALSE;
1369
1370 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1371 if (s == NULL)
1372 s = sec;
1373
1374 vpp = &elf_section_data (s)->local_dynrel;
1375 head = (struct elf_dyn_relocs **) vpp;
1376 }
1377
1378 p = *head;
1379 if (p == NULL || p->sec != sec)
1380 {
1381 bfd_size_type amt = sizeof *p;
1382
1383 p = ((struct elf_dyn_relocs *)
1384 bfd_alloc (htab->elf.dynobj, amt));
1385 if (p == NULL)
1386 return FALSE;
1387 p->next = *head;
1388 *head = p;
1389 p->sec = sec;
1390 p->count = 0;
1391 p->pc_count = 0;
1392 }
1393
1394 p->count += 1;
1395 if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
1396 || ELF32_R_TYPE (rel->r_info) == R_390_PC12DBL
1397 || ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
1398 || ELF32_R_TYPE (rel->r_info) == R_390_PC24DBL
1399 || ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
1400 || ELF32_R_TYPE (rel->r_info) == R_390_PC32)
1401 p->pc_count += 1;
1402 }
1403 break;
1404
1405 /* This relocation describes the C++ object vtable hierarchy.
1406 Reconstruct it for later use during GC. */
1407 case R_390_GNU_VTINHERIT:
1408 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1409 return FALSE;
1410 break;
1411
1412 /* This relocation describes which C++ vtable entries are actually
1413 used. Record for later use during GC. */
1414 case R_390_GNU_VTENTRY:
1415 BFD_ASSERT (h != NULL);
1416 if (h != NULL
1417 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1418 return FALSE;
1419 break;
1420
1421 default:
1422 break;
1423 }
1424 }
1425
1426 return TRUE;
1427 }
1428
1429 /* Return the section that should be marked against GC for a given
1430 relocation. */
1431
1432 static asection *
1433 elf_s390_gc_mark_hook (asection *sec,
1434 struct bfd_link_info *info,
1435 Elf_Internal_Rela *rel,
1436 struct elf_link_hash_entry *h,
1437 Elf_Internal_Sym *sym)
1438 {
1439 if (h != NULL)
1440 switch (ELF32_R_TYPE (rel->r_info))
1441 {
1442 case R_390_GNU_VTINHERIT:
1443 case R_390_GNU_VTENTRY:
1444 return NULL;
1445 }
1446 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1447
1448 }
1449
1450 /* Update the got entry reference counts for the section being removed. */
1451
1452 static bfd_boolean
1453 elf_s390_gc_sweep_hook (bfd *abfd,
1454 struct bfd_link_info *info,
1455 asection *sec,
1456 const Elf_Internal_Rela *relocs)
1457 {
1458 struct elf_s390_link_hash_table *htab;
1459 Elf_Internal_Shdr *symtab_hdr;
1460 struct elf_link_hash_entry **sym_hashes;
1461 bfd_signed_vma *local_got_refcounts;
1462 const Elf_Internal_Rela *rel, *relend;
1463
1464 if (bfd_link_relocatable (info))
1465 return TRUE;
1466
1467 htab = elf_s390_hash_table (info);
1468 if (htab == NULL)
1469 return FALSE;
1470
1471 elf_section_data (sec)->local_dynrel = NULL;
1472
1473 symtab_hdr = &elf_symtab_hdr (abfd);
1474 sym_hashes = elf_sym_hashes (abfd);
1475 local_got_refcounts = elf_local_got_refcounts (abfd);
1476
1477 relend = relocs + sec->reloc_count;
1478 for (rel = relocs; rel < relend; rel++)
1479 {
1480 unsigned long r_symndx;
1481 unsigned int r_type;
1482 struct elf_link_hash_entry *h = NULL;
1483
1484 r_symndx = ELF32_R_SYM (rel->r_info);
1485 if (r_symndx >= symtab_hdr->sh_info)
1486 {
1487 struct elf_s390_link_hash_entry *eh;
1488 struct elf_dyn_relocs **pp;
1489 struct elf_dyn_relocs *p;
1490
1491 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1492 while (h->root.type == bfd_link_hash_indirect
1493 || h->root.type == bfd_link_hash_warning)
1494 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1495 eh = (struct elf_s390_link_hash_entry *) h;
1496
1497 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1498 if (p->sec == sec)
1499 {
1500 /* Everything must go for SEC. */
1501 *pp = p->next;
1502 break;
1503 }
1504 }
1505 else
1506 {
1507 Elf_Internal_Sym *isym;
1508
1509 /* A local symbol. */
1510 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1511 abfd, r_symndx);
1512 if (isym == NULL)
1513 return FALSE;
1514
1515 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1516 {
1517 struct plt_entry *plt = elf_s390_local_plt (abfd);
1518 if (plt[r_symndx].plt.refcount > 0)
1519 plt[r_symndx].plt.refcount--;
1520 }
1521 }
1522
1523 r_type = ELF32_R_TYPE (rel->r_info);
1524 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1525 switch (r_type)
1526 {
1527 case R_390_TLS_LDM32:
1528 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1529 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1530 break;
1531
1532 case R_390_GOTOFF16:
1533 case R_390_GOTOFF32:
1534 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1535 {
1536 h->plt.refcount--;
1537 break;
1538 }
1539
1540 case R_390_GOTPC:
1541 case R_390_GOTPCDBL:
1542 break;
1543
1544 case R_390_TLS_GD32:
1545 case R_390_TLS_IE32:
1546 case R_390_TLS_GOTIE12:
1547 case R_390_TLS_GOTIE20:
1548 case R_390_TLS_GOTIE32:
1549 case R_390_TLS_IEENT:
1550 case R_390_GOT12:
1551 case R_390_GOT16:
1552 case R_390_GOT20:
1553 case R_390_GOT32:
1554 case R_390_GOTENT:
1555 if (h != NULL)
1556 {
1557 if (h->got.refcount > 0)
1558 h->got.refcount -= 1;
1559 }
1560 else if (local_got_refcounts != NULL)
1561 {
1562 if (local_got_refcounts[r_symndx] > 0)
1563 local_got_refcounts[r_symndx] -= 1;
1564 }
1565 break;
1566
1567 case R_390_8:
1568 case R_390_12:
1569 case R_390_16:
1570 case R_390_20:
1571 case R_390_32:
1572 case R_390_PC16:
1573 case R_390_PC12DBL:
1574 case R_390_PC16DBL:
1575 case R_390_PC24DBL:
1576 case R_390_PC32DBL:
1577 case R_390_PC32:
1578 if (bfd_link_pic (info))
1579 break;
1580 /* Fall through. */
1581
1582 case R_390_PLT12DBL:
1583 case R_390_PLT16DBL:
1584 case R_390_PLT24DBL:
1585 case R_390_PLT32DBL:
1586 case R_390_PLT32:
1587 case R_390_PLTOFF16:
1588 case R_390_PLTOFF32:
1589 if (h != NULL)
1590 {
1591 if (h->plt.refcount > 0)
1592 h->plt.refcount -= 1;
1593 }
1594 break;
1595
1596 case R_390_GOTPLT12:
1597 case R_390_GOTPLT16:
1598 case R_390_GOTPLT20:
1599 case R_390_GOTPLT32:
1600 case R_390_GOTPLTENT:
1601 if (h != NULL)
1602 {
1603 if (h->plt.refcount > 0)
1604 {
1605 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1606 h->plt.refcount -= 1;
1607 }
1608 }
1609 else if (local_got_refcounts != NULL)
1610 {
1611 if (local_got_refcounts[r_symndx] > 0)
1612 local_got_refcounts[r_symndx] -= 1;
1613 }
1614 break;
1615
1616 default:
1617 break;
1618 }
1619 }
1620
1621 return TRUE;
1622 }
1623
1624 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1625 entry but we found we will not create any. Called when we find we will
1626 not have any PLT for this symbol, by for example
1627 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1628 or elf_s390_size_dynamic_sections if no dynamic sections will be
1629 created (we're only linking static objects). */
1630
1631 static void
1632 elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h)
1633 {
1634 if (h->elf.root.type == bfd_link_hash_warning)
1635 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1636
1637 if (h->gotplt_refcount <= 0)
1638 return;
1639
1640 /* We simply add the number of gotplt references to the number
1641 * of got references for this symbol. */
1642 h->elf.got.refcount += h->gotplt_refcount;
1643 h->gotplt_refcount = -1;
1644 }
1645
1646 /* Adjust a symbol defined by a dynamic object and referenced by a
1647 regular object. The current definition is in some section of the
1648 dynamic object, but we're not including those sections. We have to
1649 change the definition to something the rest of the link can
1650 understand. */
1651
1652 static bfd_boolean
1653 elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
1654 struct elf_link_hash_entry *h)
1655 {
1656 struct elf_s390_link_hash_table *htab;
1657 asection *s;
1658
1659 /* STT_GNU_IFUNC symbol must go through PLT. */
1660 if (s390_is_ifunc_symbol_p (h))
1661 {
1662 /* All local STT_GNU_IFUNC references must be treated as local
1663 calls via local PLT. */
1664 if (h->ref_regular && SYMBOL_CALLS_LOCAL (info, h))
1665 {
1666 bfd_size_type pc_count = 0, count = 0;
1667 struct elf_dyn_relocs **pp;
1668 struct elf_s390_link_hash_entry *eh;
1669 struct elf_dyn_relocs *p;
1670
1671 eh = (struct elf_s390_link_hash_entry *) h;
1672 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1673 {
1674 pc_count += p->pc_count;
1675 p->count -= p->pc_count;
1676 p->pc_count = 0;
1677 count += p->count;
1678 if (p->count == 0)
1679 *pp = p->next;
1680 else
1681 pp = &p->next;
1682 }
1683
1684 if (pc_count || count)
1685 {
1686 h->needs_plt = 1;
1687 h->non_got_ref = 1;
1688 if (h->plt.refcount <= 0)
1689 h->plt.refcount = 1;
1690 else
1691 h->plt.refcount += 1;
1692 }
1693 }
1694
1695 if (h->plt.refcount <= 0)
1696 {
1697 h->plt.offset = (bfd_vma) -1;
1698 h->needs_plt = 0;
1699 }
1700 return TRUE;
1701 }
1702
1703 /* If this is a function, put it in the procedure linkage table. We
1704 will fill in the contents of the procedure linkage table later
1705 (although we could actually do it here). */
1706 if (h->type == STT_FUNC
1707 || h->needs_plt)
1708 {
1709 if (h->plt.refcount <= 0
1710 || SYMBOL_CALLS_LOCAL (info, h)
1711 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1712 && h->root.type != bfd_link_hash_undefweak))
1713 {
1714 /* This case can occur if we saw a PLT32 reloc in an input
1715 file, but the symbol was never referred to by a dynamic
1716 object, or if all references were garbage collected. In
1717 such a case, we don't actually need to build a procedure
1718 linkage table, and we can just do a PC32 reloc instead. */
1719 h->plt.offset = (bfd_vma) -1;
1720 h->needs_plt = 0;
1721 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1722 }
1723
1724 return TRUE;
1725 }
1726 else
1727 /* It's possible that we incorrectly decided a .plt reloc was
1728 needed for an R_390_PC32 reloc to a non-function sym in
1729 check_relocs. We can't decide accurately between function and
1730 non-function syms in check-relocs; Objects loaded later in
1731 the link may change h->type. So fix it now. */
1732 h->plt.offset = (bfd_vma) -1;
1733
1734 /* If this is a weak symbol, and there is a real definition, the
1735 processor independent code will have arranged for us to see the
1736 real definition first, and we can just use the same value. */
1737 if (h->u.weakdef != NULL)
1738 {
1739 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1740 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1741 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1742 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1743 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1744 h->non_got_ref = h->u.weakdef->non_got_ref;
1745 return TRUE;
1746 }
1747
1748 /* This is a reference to a symbol defined by a dynamic object which
1749 is not a function. */
1750
1751 /* If we are creating a shared library, we must presume that the
1752 only references to the symbol are via the global offset table.
1753 For such cases we need not do anything here; the relocations will
1754 be handled correctly by relocate_section. */
1755 if (bfd_link_pic (info))
1756 return TRUE;
1757
1758 /* If there are no references to this symbol that do not use the
1759 GOT, we don't need to generate a copy reloc. */
1760 if (!h->non_got_ref)
1761 return TRUE;
1762
1763 /* If -z nocopyreloc was given, we won't generate them either. */
1764 if (info->nocopyreloc)
1765 {
1766 h->non_got_ref = 0;
1767 return TRUE;
1768 }
1769
1770 if (ELIMINATE_COPY_RELOCS)
1771 {
1772 struct elf_s390_link_hash_entry * eh;
1773 struct elf_dyn_relocs *p;
1774
1775 eh = (struct elf_s390_link_hash_entry *) h;
1776 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1777 {
1778 s = p->sec->output_section;
1779 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1780 break;
1781 }
1782
1783 /* If we didn't find any dynamic relocs in read-only sections, then
1784 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1785 if (p == NULL)
1786 {
1787 h->non_got_ref = 0;
1788 return TRUE;
1789 }
1790 }
1791
1792 /* We must allocate the symbol in our .dynbss section, which will
1793 become part of the .bss section of the executable. There will be
1794 an entry for this symbol in the .dynsym section. The dynamic
1795 object will contain position independent code, so all references
1796 from the dynamic object to this symbol will go through the global
1797 offset table. The dynamic linker will use the .dynsym entry to
1798 determine the address it must put in the global offset table, so
1799 both the dynamic object and the regular object will refer to the
1800 same memory location for the variable. */
1801
1802 htab = elf_s390_hash_table (info);
1803
1804 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1805 copy the initial value out of the dynamic object and into the
1806 runtime process image. */
1807 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
1808 {
1809 htab->srelbss->size += sizeof (Elf32_External_Rela);
1810 h->needs_copy = 1;
1811 }
1812
1813 s = htab->sdynbss;
1814
1815 return _bfd_elf_adjust_dynamic_copy (info, h, s);
1816 }
1817
1818 /* Allocate space in .plt, .got and associated reloc sections for
1819 dynamic relocs. */
1820
1821 static bfd_boolean
1822 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1823 {
1824 struct bfd_link_info *info;
1825 struct elf_s390_link_hash_table *htab;
1826 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry *)h;
1827 struct elf_dyn_relocs *p;
1828
1829 if (h->root.type == bfd_link_hash_indirect)
1830 return TRUE;
1831
1832 info = (struct bfd_link_info *) inf;
1833 htab = elf_s390_hash_table (info);
1834
1835 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1836 here if it is defined and referenced in a non-shared object. */
1837 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
1838 return s390_elf_allocate_ifunc_dyn_relocs (info, h);
1839 else if (htab->elf.dynamic_sections_created
1840 && h->plt.refcount > 0)
1841 {
1842 /* Make sure this symbol is output as a dynamic symbol.
1843 Undefined weak syms won't yet be marked as dynamic. */
1844 if (h->dynindx == -1
1845 && !h->forced_local)
1846 {
1847 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1848 return FALSE;
1849 }
1850
1851 if (bfd_link_pic (info)
1852 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1853 {
1854 asection *s = htab->elf.splt;
1855
1856 /* If this is the first .plt entry, make room for the special
1857 first entry. */
1858 if (s->size == 0)
1859 s->size += PLT_FIRST_ENTRY_SIZE;
1860
1861 h->plt.offset = s->size;
1862
1863 /* If this symbol is not defined in a regular file, and we are
1864 not generating a shared library, then set the symbol to this
1865 location in the .plt. This is required to make function
1866 pointers compare as equal between the normal executable and
1867 the shared library. */
1868 if (! bfd_link_pic (info)
1869 && !h->def_regular)
1870 {
1871 h->root.u.def.section = s;
1872 h->root.u.def.value = h->plt.offset;
1873 }
1874
1875 /* Make room for this entry. */
1876 s->size += PLT_ENTRY_SIZE;
1877
1878 /* We also need to make an entry in the .got.plt section, which
1879 will be placed in the .got section by the linker script. */
1880 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1881
1882 /* We also need to make an entry in the .rela.plt section. */
1883 htab->elf.srelplt->size += sizeof (Elf32_External_Rela);
1884 }
1885 else
1886 {
1887 h->plt.offset = (bfd_vma) -1;
1888 h->needs_plt = 0;
1889 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1890 }
1891 }
1892 else
1893 {
1894 h->plt.offset = (bfd_vma) -1;
1895 h->needs_plt = 0;
1896 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1897 }
1898
1899 /* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to
1900 the binary, we can optimize a bit. IE32 and GOTIE32 get converted
1901 to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT
1902 we can save the dynamic TLS relocation. */
1903 if (h->got.refcount > 0
1904 && !bfd_link_pic (info)
1905 && h->dynindx == -1
1906 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1907 {
1908 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1909 /* For the GOTIE access without a literal pool entry the offset has
1910 to be stored somewhere. The immediate value in the instruction
1911 is not bit enough so the value is stored in the got. */
1912 {
1913 h->got.offset = htab->elf.sgot->size;
1914 htab->elf.sgot->size += GOT_ENTRY_SIZE;
1915 }
1916 else
1917 h->got.offset = (bfd_vma) -1;
1918 }
1919 else if (h->got.refcount > 0)
1920 {
1921 asection *s;
1922 bfd_boolean dyn;
1923 int tls_type = elf_s390_hash_entry(h)->tls_type;
1924
1925 /* Make sure this symbol is output as a dynamic symbol.
1926 Undefined weak syms won't yet be marked as dynamic. */
1927 if (h->dynindx == -1
1928 && !h->forced_local)
1929 {
1930 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1931 return FALSE;
1932 }
1933
1934 s = htab->elf.sgot;
1935 h->got.offset = s->size;
1936 s->size += GOT_ENTRY_SIZE;
1937 /* R_390_TLS_GD32 needs 2 consecutive GOT slots. */
1938 if (tls_type == GOT_TLS_GD)
1939 s->size += GOT_ENTRY_SIZE;
1940 dyn = htab->elf.dynamic_sections_created;
1941 /* R_390_TLS_IE32 needs one dynamic relocation,
1942 R_390_TLS_GD32 needs one if local symbol and two if global. */
1943 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1944 || tls_type >= GOT_TLS_IE)
1945 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1946 else if (tls_type == GOT_TLS_GD)
1947 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rela);
1948 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1949 || h->root.type != bfd_link_hash_undefweak)
1950 && (bfd_link_pic (info)
1951 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1952 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
1953 }
1954 else
1955 h->got.offset = (bfd_vma) -1;
1956
1957 if (eh->dyn_relocs == NULL)
1958 return TRUE;
1959
1960 /* In the shared -Bsymbolic case, discard space allocated for
1961 dynamic pc-relative relocs against symbols which turn out to be
1962 defined in regular objects. For the normal shared case, discard
1963 space for pc-relative relocs that have become local due to symbol
1964 visibility changes. */
1965
1966 if (bfd_link_pic (info))
1967 {
1968 if (SYMBOL_CALLS_LOCAL (info, h))
1969 {
1970 struct elf_dyn_relocs **pp;
1971
1972 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1973 {
1974 p->count -= p->pc_count;
1975 p->pc_count = 0;
1976 if (p->count == 0)
1977 *pp = p->next;
1978 else
1979 pp = &p->next;
1980 }
1981 }
1982
1983 /* Also discard relocs on undefined weak syms with non-default
1984 visibility. */
1985 if (eh->dyn_relocs != NULL
1986 && h->root.type == bfd_link_hash_undefweak)
1987 {
1988 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1989 eh->dyn_relocs = NULL;
1990
1991 /* Make sure undefined weak symbols are output as a dynamic
1992 symbol in PIEs. */
1993 else if (h->dynindx == -1
1994 && !h->forced_local)
1995 {
1996 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1997 return FALSE;
1998 }
1999 }
2000 }
2001 else if (ELIMINATE_COPY_RELOCS)
2002 {
2003 /* For the non-shared case, discard space for relocs against
2004 symbols which turn out to need copy relocs or are not
2005 dynamic. */
2006
2007 if (!h->non_got_ref
2008 && ((h->def_dynamic
2009 && !h->def_regular)
2010 || (htab->elf.dynamic_sections_created
2011 && (h->root.type == bfd_link_hash_undefweak
2012 || h->root.type == bfd_link_hash_undefined))))
2013 {
2014 /* Make sure this symbol is output as a dynamic symbol.
2015 Undefined weak syms won't yet be marked as dynamic. */
2016 if (h->dynindx == -1
2017 && !h->forced_local)
2018 {
2019 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2020 return FALSE;
2021 }
2022
2023 /* If that succeeded, we know we'll be keeping all the
2024 relocs. */
2025 if (h->dynindx != -1)
2026 goto keep;
2027 }
2028
2029 eh->dyn_relocs = NULL;
2030
2031 keep: ;
2032 }
2033
2034 /* Finally, allocate space. */
2035 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2036 {
2037 asection *sreloc = elf_section_data (p->sec)->sreloc;
2038
2039 sreloc->size += p->count * sizeof (Elf32_External_Rela);
2040 }
2041
2042 return TRUE;
2043 }
2044
2045 /* Find any dynamic relocs that apply to read-only sections. */
2046
2047 static bfd_boolean
2048 readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2049 {
2050 struct elf_s390_link_hash_entry *eh;
2051 struct elf_dyn_relocs *p;
2052
2053 eh = (struct elf_s390_link_hash_entry *) h;
2054 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2055 {
2056 asection *s = p->sec->output_section;
2057
2058 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2059 {
2060 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2061
2062 info->flags |= DF_TEXTREL;
2063
2064 /* Not an error, just cut short the traversal. */
2065 return FALSE;
2066 }
2067 }
2068 return TRUE;
2069 }
2070
2071 /* Set the sizes of the dynamic sections. */
2072
2073 static bfd_boolean
2074 elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2075 struct bfd_link_info *info)
2076 {
2077 struct elf_s390_link_hash_table *htab;
2078 bfd *dynobj;
2079 asection *s;
2080 bfd_boolean relocs;
2081 bfd *ibfd;
2082
2083 htab = elf_s390_hash_table (info);
2084 dynobj = htab->elf.dynobj;
2085 if (dynobj == NULL)
2086 abort ();
2087
2088 if (htab->elf.dynamic_sections_created)
2089 {
2090 /* Set the contents of the .interp section to the interpreter. */
2091 if (bfd_link_executable (info) && !info->nointerp)
2092 {
2093 s = bfd_get_linker_section (dynobj, ".interp");
2094 if (s == NULL)
2095 abort ();
2096 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2097 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2098 }
2099 }
2100
2101 /* Set up .got offsets for local syms, and space for local dynamic
2102 relocs. */
2103 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2104 {
2105 bfd_signed_vma *local_got;
2106 bfd_signed_vma *end_local_got;
2107 char *local_tls_type;
2108 bfd_size_type locsymcount;
2109 Elf_Internal_Shdr *symtab_hdr;
2110 asection *srela;
2111 struct plt_entry *local_plt;
2112 unsigned int i;
2113
2114 if (! is_s390_elf (ibfd))
2115 continue;
2116
2117 for (s = ibfd->sections; s != NULL; s = s->next)
2118 {
2119 struct elf_dyn_relocs *p;
2120
2121 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
2122 {
2123 if (!bfd_is_abs_section (p->sec)
2124 && bfd_is_abs_section (p->sec->output_section))
2125 {
2126 /* Input section has been discarded, either because
2127 it is a copy of a linkonce section or due to
2128 linker script /DISCARD/, so we'll be discarding
2129 the relocs too. */
2130 }
2131 else if (p->count != 0)
2132 {
2133 srela = elf_section_data (p->sec)->sreloc;
2134 srela->size += p->count * sizeof (Elf32_External_Rela);
2135 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2136 info->flags |= DF_TEXTREL;
2137 }
2138 }
2139 }
2140
2141 local_got = elf_local_got_refcounts (ibfd);
2142 if (!local_got)
2143 continue;
2144
2145 symtab_hdr = &elf_symtab_hdr (ibfd);
2146 locsymcount = symtab_hdr->sh_info;
2147 end_local_got = local_got + locsymcount;
2148 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2149 s = htab->elf.sgot;
2150 srela = htab->elf.srelgot;
2151 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2152 {
2153 if (*local_got > 0)
2154 {
2155 *local_got = s->size;
2156 s->size += GOT_ENTRY_SIZE;
2157 if (*local_tls_type == GOT_TLS_GD)
2158 s->size += GOT_ENTRY_SIZE;
2159 if (bfd_link_pic (info))
2160 srela->size += sizeof (Elf32_External_Rela);
2161 }
2162 else
2163 *local_got = (bfd_vma) -1;
2164 }
2165 local_plt = elf_s390_local_plt (ibfd);
2166 for (i = 0; i < symtab_hdr->sh_info; i++)
2167 {
2168 if (local_plt[i].plt.refcount > 0)
2169 {
2170 local_plt[i].plt.offset = htab->elf.iplt->size;
2171 htab->elf.iplt->size += PLT_ENTRY_SIZE;
2172 htab->elf.igotplt->size += GOT_ENTRY_SIZE;
2173 htab->elf.irelplt->size += RELA_ENTRY_SIZE;
2174 }
2175 else
2176 local_plt[i].plt.offset = (bfd_vma) -1;
2177 }
2178 }
2179
2180 if (htab->tls_ldm_got.refcount > 0)
2181 {
2182 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32
2183 relocs. */
2184 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2185 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2186 htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
2187 }
2188 else
2189 htab->tls_ldm_got.offset = -1;
2190
2191 /* Allocate global sym .plt and .got entries, and space for global
2192 sym dynamic relocs. */
2193 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
2194
2195 /* We now have determined the sizes of the various dynamic sections.
2196 Allocate memory for them. */
2197 relocs = FALSE;
2198 for (s = dynobj->sections; s != NULL; s = s->next)
2199 {
2200 if ((s->flags & SEC_LINKER_CREATED) == 0)
2201 continue;
2202
2203 if (s == htab->elf.splt
2204 || s == htab->elf.sgot
2205 || s == htab->elf.sgotplt
2206 || s == htab->sdynbss
2207 || s == htab->elf.iplt
2208 || s == htab->elf.igotplt
2209 || s == htab->irelifunc)
2210 {
2211 /* Strip this section if we don't need it; see the
2212 comment below. */
2213 }
2214 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2215 {
2216 if (s->size != 0)
2217 relocs = TRUE;
2218
2219 /* We use the reloc_count field as a counter if we need
2220 to copy relocs into the output file. */
2221 s->reloc_count = 0;
2222 }
2223 else
2224 {
2225 /* It's not one of our sections, so don't allocate space. */
2226 continue;
2227 }
2228
2229 if (s->size == 0)
2230 {
2231 /* If we don't need this section, strip it from the
2232 output file. This is to handle .rela.bss and
2233 .rela.plt. We must create it in
2234 create_dynamic_sections, because it must be created
2235 before the linker maps input sections to output
2236 sections. The linker does that before
2237 adjust_dynamic_symbol is called, and it is that
2238 function which decides whether anything needs to go
2239 into these sections. */
2240
2241 s->flags |= SEC_EXCLUDE;
2242 continue;
2243 }
2244
2245 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2246 continue;
2247
2248 /* Allocate memory for the section contents. We use bfd_zalloc
2249 here in case unused entries are not reclaimed before the
2250 section's contents are written out. This should not happen,
2251 but this way if it does, we get a R_390_NONE reloc instead
2252 of garbage. */
2253 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2254 if (s->contents == NULL)
2255 return FALSE;
2256 }
2257
2258 if (htab->elf.dynamic_sections_created)
2259 {
2260 /* Add some entries to the .dynamic section. We fill in the
2261 values later, in elf_s390_finish_dynamic_sections, but we
2262 must add the entries now so that we get the correct size for
2263 the .dynamic section. The DT_DEBUG entry is filled in by the
2264 dynamic linker and used by the debugger. */
2265 #define add_dynamic_entry(TAG, VAL) \
2266 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2267
2268 if (bfd_link_executable (info))
2269 {
2270 if (!add_dynamic_entry (DT_DEBUG, 0))
2271 return FALSE;
2272 }
2273
2274 if (htab->elf.splt->size != 0)
2275 {
2276 if (!add_dynamic_entry (DT_PLTGOT, 0)
2277 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2278 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2279 || !add_dynamic_entry (DT_JMPREL, 0))
2280 return FALSE;
2281 }
2282
2283 if (relocs)
2284 {
2285 if (!add_dynamic_entry (DT_RELA, 0)
2286 || !add_dynamic_entry (DT_RELASZ, 0)
2287 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
2288 return FALSE;
2289
2290 /* If any dynamic relocs apply to a read-only section,
2291 then we need a DT_TEXTREL entry. */
2292 if ((info->flags & DF_TEXTREL) == 0)
2293 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info);
2294
2295 if ((info->flags & DF_TEXTREL) != 0)
2296 {
2297 if (!add_dynamic_entry (DT_TEXTREL, 0))
2298 return FALSE;
2299 }
2300 }
2301 }
2302 #undef add_dynamic_entry
2303
2304 return TRUE;
2305 }
2306
2307 /* Return the base VMA address which should be subtracted from real addresses
2308 when resolving @dtpoff relocation.
2309 This is PT_TLS segment p_vaddr. */
2310
2311 static bfd_vma
2312 dtpoff_base (struct bfd_link_info *info)
2313 {
2314 /* If tls_sec is NULL, we should have signalled an error already. */
2315 if (elf_hash_table (info)->tls_sec == NULL)
2316 return 0;
2317 return elf_hash_table (info)->tls_sec->vma;
2318 }
2319
2320 /* Return the relocation value for @tpoff relocation
2321 if STT_TLS virtual address is ADDRESS. */
2322
2323 static bfd_vma
2324 tpoff (struct bfd_link_info *info, bfd_vma address)
2325 {
2326 struct elf_link_hash_table *htab = elf_hash_table (info);
2327
2328 /* If tls_sec is NULL, we should have signalled an error already. */
2329 if (htab->tls_sec == NULL)
2330 return 0;
2331 return htab->tls_size + htab->tls_sec->vma - address;
2332 }
2333
2334 /* Complain if TLS instruction relocation is against an invalid
2335 instruction. */
2336
2337 static void
2338 invalid_tls_insn (bfd *input_bfd,
2339 asection *input_section,
2340 Elf_Internal_Rela *rel)
2341 {
2342 reloc_howto_type *howto;
2343
2344 howto = elf_howto_table + ELF32_R_TYPE (rel->r_info);
2345 (*_bfd_error_handler)
2346 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2347 input_bfd,
2348 input_section,
2349 (long) rel->r_offset,
2350 howto->name);
2351 bfd_set_error (bfd_error_bad_value);
2352 }
2353
2354 /* Relocate a 390 ELF section. */
2355
2356 static bfd_boolean
2357 elf_s390_relocate_section (bfd *output_bfd,
2358 struct bfd_link_info *info,
2359 bfd *input_bfd,
2360 asection *input_section,
2361 bfd_byte *contents,
2362 Elf_Internal_Rela *relocs,
2363 Elf_Internal_Sym *local_syms,
2364 asection **local_sections)
2365 {
2366 struct elf_s390_link_hash_table *htab;
2367 Elf_Internal_Shdr *symtab_hdr;
2368 struct elf_link_hash_entry **sym_hashes;
2369 bfd_vma *local_got_offsets;
2370 Elf_Internal_Rela *rel;
2371 Elf_Internal_Rela *relend;
2372
2373 BFD_ASSERT (is_s390_elf (input_bfd));
2374
2375 htab = elf_s390_hash_table (info);
2376 symtab_hdr = &elf_symtab_hdr (input_bfd);
2377 sym_hashes = elf_sym_hashes (input_bfd);
2378 local_got_offsets = elf_local_got_offsets (input_bfd);
2379
2380 rel = relocs;
2381 relend = relocs + input_section->reloc_count;
2382 for (; rel < relend; rel++)
2383 {
2384 unsigned int r_type;
2385 reloc_howto_type *howto;
2386 unsigned long r_symndx;
2387 struct elf_link_hash_entry *h;
2388 Elf_Internal_Sym *sym;
2389 asection *sec;
2390 bfd_vma off;
2391 bfd_vma relocation;
2392 bfd_boolean unresolved_reloc;
2393 bfd_reloc_status_type r;
2394 int tls_type;
2395 asection *base_got = htab->elf.sgot;
2396
2397 r_type = ELF32_R_TYPE (rel->r_info);
2398 if (r_type == (int) R_390_GNU_VTINHERIT
2399 || r_type == (int) R_390_GNU_VTENTRY)
2400 continue;
2401 if (r_type >= (int) R_390_max)
2402 {
2403 bfd_set_error (bfd_error_bad_value);
2404 return FALSE;
2405 }
2406
2407 howto = elf_howto_table + r_type;
2408 r_symndx = ELF32_R_SYM (rel->r_info);
2409
2410 h = NULL;
2411 sym = NULL;
2412 sec = NULL;
2413 unresolved_reloc = FALSE;
2414 if (r_symndx < symtab_hdr->sh_info)
2415 {
2416 sym = local_syms + r_symndx;
2417 sec = local_sections[r_symndx];
2418 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2419 {
2420 struct plt_entry *local_plt = elf_s390_local_plt (input_bfd);
2421 if (local_plt == NULL)
2422 return FALSE;
2423
2424 /* Address of the PLT slot. */
2425 relocation = (htab->elf.iplt->output_section->vma
2426 + htab->elf.iplt->output_offset
2427 + local_plt[r_symndx].plt.offset);
2428
2429 switch (r_type)
2430 {
2431 case R_390_PLTOFF16:
2432 case R_390_PLTOFF32:
2433 relocation -= htab->elf.sgot->output_section->vma;
2434 break;
2435 case R_390_GOTPLT12:
2436 case R_390_GOTPLT16:
2437 case R_390_GOTPLT20:
2438 case R_390_GOTPLT32:
2439 case R_390_GOTPLTENT:
2440 case R_390_GOT12:
2441 case R_390_GOT16:
2442 case R_390_GOT20:
2443 case R_390_GOT32:
2444 case R_390_GOTENT:
2445 {
2446 /* Write the PLT slot address into the GOT slot. */
2447 bfd_put_32 (output_bfd, relocation,
2448 htab->elf.sgot->contents +
2449 local_got_offsets[r_symndx]);
2450 relocation = (local_got_offsets[r_symndx] +
2451 htab->elf.sgot->output_offset);
2452
2453 if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
2454 relocation += htab->elf.sgot->output_section->vma;
2455 break;
2456 }
2457 default:
2458 break;
2459 }
2460 /* The output section is needed later in
2461 finish_dynamic_section when creating the dynamic
2462 relocation. */
2463 local_plt[r_symndx].sec = sec;
2464 goto do_relocation;
2465 }
2466 else
2467 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2468 }
2469 else
2470 {
2471 bfd_boolean warned ATTRIBUTE_UNUSED;
2472 bfd_boolean ignored ATTRIBUTE_UNUSED;
2473
2474 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2475 r_symndx, symtab_hdr, sym_hashes,
2476 h, sec, relocation,
2477 unresolved_reloc, warned, ignored);
2478 }
2479
2480 if (sec != NULL && discarded_section (sec))
2481 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2482 rel, 1, relend, howto, 0, contents);
2483
2484 if (bfd_link_relocatable (info))
2485 continue;
2486
2487 switch (r_type)
2488 {
2489 case R_390_GOTPLT12:
2490 case R_390_GOTPLT16:
2491 case R_390_GOTPLT20:
2492 case R_390_GOTPLT32:
2493 case R_390_GOTPLTENT:
2494 /* There are three cases for a GOTPLT relocation. 1) The
2495 relocation is against the jump slot entry of a plt that
2496 will get emitted to the output file. 2) The relocation
2497 is against the jump slot of a plt entry that has been
2498 removed. elf_s390_adjust_gotplt has created a GOT entry
2499 as replacement. 3) The relocation is against a local symbol.
2500 Cases 2) and 3) are the same as the GOT relocation code
2501 so we just have to test for case 1 and fall through for
2502 the other two. */
2503 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2504 {
2505 bfd_vma plt_index;
2506
2507 if (s390_is_ifunc_symbol_p (h))
2508 {
2509 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2510 relocation = (plt_index * GOT_ENTRY_SIZE +
2511 htab->elf.igotplt->output_offset);
2512 if (r_type == R_390_GOTPLTENT)
2513 relocation += htab->elf.igotplt->output_section->vma;
2514 }
2515 else
2516 {
2517 /* Calc. index no.
2518 Current offset - size first entry / entry size. */
2519 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2520 PLT_ENTRY_SIZE;
2521
2522 /* Offset in GOT is PLT index plus GOT headers(3)
2523 times 4, addr & GOT addr. */
2524 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2525 if (r_type == R_390_GOTPLTENT)
2526 relocation += htab->elf.sgot->output_section->vma;
2527 }
2528 unresolved_reloc = FALSE;
2529
2530 }
2531 /* Fall through. */
2532
2533 case R_390_GOT12:
2534 case R_390_GOT16:
2535 case R_390_GOT20:
2536 case R_390_GOT32:
2537 case R_390_GOTENT:
2538 /* Relocation is to the entry for this symbol in the global
2539 offset table. */
2540 if (base_got == NULL)
2541 abort ();
2542
2543 if (h != NULL)
2544 {
2545 bfd_boolean dyn;
2546
2547 off = h->got.offset;
2548 dyn = htab->elf.dynamic_sections_created;
2549
2550 if (s390_is_ifunc_symbol_p (h))
2551 {
2552 BFD_ASSERT (h->plt.offset != (bfd_vma) -1);
2553 if (off == (bfd_vma)-1)
2554 {
2555 /* No explicit GOT usage so redirect to the
2556 got.iplt slot. */
2557 base_got = htab->elf.igotplt;
2558 off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE;
2559 }
2560 else
2561 {
2562 /* Explicit GOT slots must contain the address
2563 of the PLT slot. This will be handled in
2564 finish_dynamic_symbol. */
2565 }
2566 }
2567 else if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
2568 bfd_link_pic (info),
2569 h)
2570 || (bfd_link_pic (info)
2571 && SYMBOL_REFERENCES_LOCAL (info, h))
2572 || (ELF_ST_VISIBILITY (h->other)
2573 && h->root.type == bfd_link_hash_undefweak))
2574
2575 {
2576 /* This is actually a static link, or it is a
2577 -Bsymbolic link and the symbol is defined
2578 locally, or the symbol was forced to be local
2579 because of a version file. We must initialize
2580 this entry in the global offset table. Since the
2581 offset must always be a multiple of 2, we use the
2582 least significant bit to record whether we have
2583 initialized it already.
2584
2585 When doing a dynamic link, we create a .rel.got
2586 relocation entry to initialize the value. This
2587 is done in the finish_dynamic_symbol routine. */
2588 if ((off & 1) != 0)
2589 off &= ~1;
2590 else
2591 {
2592 bfd_put_32 (output_bfd, relocation,
2593 base_got->contents + off);
2594 h->got.offset |= 1;
2595 }
2596
2597 if ((h->def_regular
2598 && bfd_link_pic (info)
2599 && SYMBOL_REFERENCES_LOCAL (info, h))
2600 /* lrl rx,sym@GOTENT -> larl rx, sym */
2601 && ((r_type == R_390_GOTENT
2602 && (bfd_get_16 (input_bfd,
2603 contents + rel->r_offset - 2)
2604 & 0xff0f) == 0xc40d)
2605 /* ly rx, sym@GOT(r12) -> larl rx, sym */
2606 || (r_type == R_390_GOT20
2607 && (bfd_get_32 (input_bfd,
2608 contents + rel->r_offset - 2)
2609 & 0xff00f000) == 0xe300c000
2610 && bfd_get_8 (input_bfd,
2611 contents + rel->r_offset + 3) == 0x58)))
2612 {
2613 unsigned short new_insn =
2614 (0xc000 | (bfd_get_8 (input_bfd,
2615 contents + rel->r_offset - 1) & 0xf0));
2616 bfd_put_16 (output_bfd, new_insn,
2617 contents + rel->r_offset - 2);
2618 r_type = R_390_PC32DBL;
2619 rel->r_addend = 2;
2620 howto = elf_howto_table + r_type;
2621 relocation = h->root.u.def.value
2622 + h->root.u.def.section->output_section->vma
2623 + h->root.u.def.section->output_offset;
2624 goto do_relocation;
2625 }
2626 }
2627 else
2628 unresolved_reloc = FALSE;
2629 }
2630 else
2631 {
2632 if (local_got_offsets == NULL)
2633 abort ();
2634
2635 off = local_got_offsets[r_symndx];
2636
2637 /* The offset must always be a multiple of 4. We use
2638 the least significant bit to record whether we have
2639 already generated the necessary reloc. */
2640 if ((off & 1) != 0)
2641 off &= ~1;
2642 else
2643 {
2644 bfd_put_32 (output_bfd, relocation,
2645 htab->elf.sgot->contents + off);
2646
2647 if (bfd_link_pic (info))
2648 {
2649 asection *srelgot;
2650 Elf_Internal_Rela outrel;
2651 bfd_byte *loc;
2652
2653 srelgot = htab->elf.srelgot;
2654 if (srelgot == NULL)
2655 abort ();
2656
2657 outrel.r_offset = (htab->elf.sgot->output_section->vma
2658 + htab->elf.sgot->output_offset
2659 + off);
2660 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2661 outrel.r_addend = relocation;
2662 loc = srelgot->contents;
2663 loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
2664 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2665 }
2666
2667 local_got_offsets[r_symndx] |= 1;
2668 }
2669 }
2670
2671 if (off >= (bfd_vma) -2)
2672 abort ();
2673
2674 relocation = base_got->output_offset + off;
2675
2676 /* For @GOTENT the relocation is against the offset between
2677 the instruction and the symbols entry in the GOT and not
2678 between the start of the GOT and the symbols entry. We
2679 add the vma of the GOT to get the correct value. */
2680 if ( r_type == R_390_GOTENT
2681 || r_type == R_390_GOTPLTENT)
2682 relocation += base_got->output_section->vma;
2683
2684 break;
2685
2686 case R_390_GOTOFF16:
2687 case R_390_GOTOFF32:
2688 /* Relocation is relative to the start of the global offset
2689 table. */
2690
2691 if (h != NULL
2692 && s390_is_ifunc_symbol_p (h)
2693 && h->def_regular
2694 && !bfd_link_executable (info))
2695 {
2696 relocation = (htab->elf.iplt->output_section->vma
2697 + htab->elf.iplt->output_offset
2698 + h->plt.offset
2699 - htab->elf.sgot->output_section->vma);
2700 goto do_relocation;
2701 }
2702
2703 /* Note that sgot->output_offset is not involved in this
2704 calculation. We always want the start of .got. If we
2705 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2706 permitted by the ABI, we might have to change this
2707 calculation. */
2708 relocation -= htab->elf.sgot->output_section->vma;
2709 break;
2710
2711 case R_390_GOTPC:
2712 case R_390_GOTPCDBL:
2713 /* Use global offset table as symbol value. */
2714 relocation = htab->elf.sgot->output_section->vma;
2715 unresolved_reloc = FALSE;
2716 break;
2717
2718 case R_390_PLT12DBL:
2719 case R_390_PLT16DBL:
2720 case R_390_PLT24DBL:
2721 case R_390_PLT32DBL:
2722 case R_390_PLT32:
2723 /* Relocation is to the entry for this symbol in the
2724 procedure linkage table. */
2725
2726 /* Resolve a PLT32 reloc against a local symbol directly,
2727 without using the procedure linkage table. */
2728 if (h == NULL)
2729 break;
2730
2731 if (h->plt.offset == (bfd_vma) -1
2732 || (htab->elf.splt == NULL && htab->elf.iplt == NULL))
2733 {
2734 /* We didn't make a PLT entry for this symbol. This
2735 happens when statically linking PIC code, or when
2736 using -Bsymbolic. */
2737 break;
2738 }
2739
2740 if (s390_is_ifunc_symbol_p (h))
2741 relocation = (htab->elf.iplt->output_section->vma
2742 + htab->elf.iplt->output_offset
2743 + h->plt.offset);
2744 else
2745 relocation = (htab->elf.splt->output_section->vma
2746 + htab->elf.splt->output_offset
2747 + h->plt.offset);
2748 unresolved_reloc = FALSE;
2749 break;
2750
2751 case R_390_PLTOFF16:
2752 case R_390_PLTOFF32:
2753 /* Relocation is to the entry for this symbol in the
2754 procedure linkage table relative to the start of the GOT. */
2755
2756 /* For local symbols or if we didn't make a PLT entry for
2757 this symbol resolve the symbol directly. */
2758 if (h == NULL
2759 || h->plt.offset == (bfd_vma) -1
2760 || (htab->elf.splt == NULL && !s390_is_ifunc_symbol_p (h)))
2761 {
2762 relocation -= htab->elf.sgot->output_section->vma;
2763 break;
2764 }
2765
2766 if (s390_is_ifunc_symbol_p (h))
2767 relocation = (htab->elf.iplt->output_section->vma
2768 + htab->elf.iplt->output_offset
2769 + h->plt.offset
2770 - htab->elf.sgot->output_section->vma);
2771 else
2772 relocation = (htab->elf.splt->output_section->vma
2773 + htab->elf.splt->output_offset
2774 + h->plt.offset
2775 - htab->elf.sgot->output_section->vma);
2776 unresolved_reloc = FALSE;
2777 break;
2778
2779 case R_390_8:
2780 case R_390_16:
2781 case R_390_32:
2782 case R_390_PC16:
2783 case R_390_PC12DBL:
2784 case R_390_PC16DBL:
2785 case R_390_PC24DBL:
2786 case R_390_PC32DBL:
2787 case R_390_PC32:
2788 if (h != NULL
2789 && s390_is_ifunc_symbol_p (h)
2790 && h->def_regular)
2791 {
2792 if (!bfd_link_pic (info) || !h->non_got_ref)
2793 {
2794 /* For a non-shared object STT_GNU_IFUNC symbol must
2795 go through PLT. */
2796 relocation = (htab->elf.iplt->output_section->vma
2797 + htab->elf.iplt->output_offset
2798 + h ->plt.offset);
2799 goto do_relocation;
2800 }
2801 else
2802 {
2803 /* For shared objects a runtime relocation is needed. */
2804
2805 Elf_Internal_Rela outrel;
2806 asection *sreloc;
2807
2808 /* Need a dynamic relocation to get the real function
2809 address. */
2810 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2811 info,
2812 input_section,
2813 rel->r_offset);
2814 if (outrel.r_offset == (bfd_vma) -1
2815 || outrel.r_offset == (bfd_vma) -2)
2816 abort ();
2817
2818 outrel.r_offset += (input_section->output_section->vma
2819 + input_section->output_offset);
2820
2821 if (h->dynindx == -1
2822 || h->forced_local
2823 || bfd_link_executable (info))
2824 {
2825 /* This symbol is resolved locally. */
2826 outrel.r_info = ELF32_R_INFO (0, R_390_IRELATIVE);
2827 outrel.r_addend = (h->root.u.def.value
2828 + h->root.u.def.section->output_section->vma
2829 + h->root.u.def.section->output_offset);
2830 }
2831 else
2832 {
2833 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2834 outrel.r_addend = 0;
2835 }
2836
2837 sreloc = htab->elf.irelifunc;
2838 elf_append_rela (output_bfd, sreloc, &outrel);
2839
2840 /* If this reloc is against an external symbol, we
2841 do not want to fiddle with the addend. Otherwise,
2842 we need to include the symbol value so that it
2843 becomes an addend for the dynamic reloc. For an
2844 internal symbol, we have updated addend. */
2845 continue;
2846 }
2847 }
2848
2849 if ((input_section->flags & SEC_ALLOC) == 0)
2850 break;
2851
2852 if ((bfd_link_pic (info)
2853 && (h == NULL
2854 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2855 || h->root.type != bfd_link_hash_undefweak)
2856 && ((r_type != R_390_PC16
2857 && r_type != R_390_PC12DBL
2858 && r_type != R_390_PC16DBL
2859 && r_type != R_390_PC24DBL
2860 && r_type != R_390_PC32DBL
2861 && r_type != R_390_PC32)
2862 || !SYMBOL_CALLS_LOCAL (info, h)))
2863 || (ELIMINATE_COPY_RELOCS
2864 && !bfd_link_pic (info)
2865 && h != NULL
2866 && h->dynindx != -1
2867 && !h->non_got_ref
2868 && ((h->def_dynamic
2869 && !h->def_regular)
2870 || h->root.type == bfd_link_hash_undefweak
2871 || h->root.type == bfd_link_hash_undefined)))
2872 {
2873 Elf_Internal_Rela outrel;
2874 bfd_boolean skip, relocate;
2875 asection *sreloc;
2876 bfd_byte *loc;
2877
2878 /* When generating a shared object, these relocations
2879 are copied into the output file to be resolved at run
2880 time. */
2881
2882 skip = FALSE;
2883 relocate = FALSE;
2884
2885 outrel.r_offset =
2886 _bfd_elf_section_offset (output_bfd, info, input_section,
2887 rel->r_offset);
2888 if (outrel.r_offset == (bfd_vma) -1)
2889 skip = TRUE;
2890 else if (outrel.r_offset == (bfd_vma) -2)
2891 skip = TRUE, relocate = TRUE;
2892 outrel.r_offset += (input_section->output_section->vma
2893 + input_section->output_offset);
2894
2895 if (skip)
2896 memset (&outrel, 0, sizeof outrel);
2897 else if (h != NULL
2898 && h->dynindx != -1
2899 && (r_type == R_390_PC16
2900 || r_type == R_390_PC12DBL
2901 || r_type == R_390_PC16DBL
2902 || r_type == R_390_PC24DBL
2903 || r_type == R_390_PC32DBL
2904 || r_type == R_390_PC32
2905 || !bfd_link_pic (info)
2906 || !SYMBOLIC_BIND (info, h)
2907 || !h->def_regular))
2908 {
2909 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2910 outrel.r_addend = rel->r_addend;
2911 }
2912 else
2913 {
2914 /* This symbol is local, or marked to become local. */
2915 outrel.r_addend = relocation + rel->r_addend;
2916 if (r_type == R_390_32)
2917 {
2918 relocate = TRUE;
2919 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2920 }
2921 else
2922 {
2923 long sindx;
2924
2925 if (bfd_is_abs_section (sec))
2926 sindx = 0;
2927 else if (sec == NULL || sec->owner == NULL)
2928 {
2929 bfd_set_error(bfd_error_bad_value);
2930 return FALSE;
2931 }
2932 else
2933 {
2934 asection *osec;
2935
2936 osec = sec->output_section;
2937 sindx = elf_section_data (osec)->dynindx;
2938 if (sindx == 0)
2939 {
2940 osec = htab->elf.text_index_section;
2941 sindx = elf_section_data (osec)->dynindx;
2942 }
2943 BFD_ASSERT (sindx != 0);
2944
2945 /* We are turning this relocation into one
2946 against a section symbol, so subtract out
2947 the output section's address but not the
2948 offset of the input section in the output
2949 section. */
2950 outrel.r_addend -= osec->vma;
2951 }
2952 outrel.r_info = ELF32_R_INFO (sindx, r_type);
2953 }
2954 }
2955
2956 sreloc = elf_section_data (input_section)->sreloc;
2957 if (sreloc == NULL)
2958 abort ();
2959
2960 loc = sreloc->contents;
2961 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2962 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
2963
2964 /* If this reloc is against an external symbol, we do
2965 not want to fiddle with the addend. Otherwise, we
2966 need to include the symbol value so that it becomes
2967 an addend for the dynamic reloc. */
2968 if (! relocate)
2969 continue;
2970 }
2971 break;
2972
2973 /* Relocations for tls literal pool entries. */
2974 case R_390_TLS_IE32:
2975 if (bfd_link_pic (info))
2976 {
2977 Elf_Internal_Rela outrel;
2978 asection *sreloc;
2979 bfd_byte *loc;
2980
2981 outrel.r_offset = rel->r_offset
2982 + input_section->output_section->vma
2983 + input_section->output_offset;
2984 outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
2985 sreloc = elf_section_data (input_section)->sreloc;
2986 if (sreloc == NULL)
2987 abort ();
2988 loc = sreloc->contents;
2989 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
2990 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2991 }
2992 /* Fall through. */
2993
2994 case R_390_TLS_GD32:
2995 case R_390_TLS_GOTIE32:
2996 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2997 tls_type = GOT_UNKNOWN;
2998 if (h == NULL && local_got_offsets)
2999 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
3000 else if (h != NULL)
3001 {
3002 tls_type = elf_s390_hash_entry(h)->tls_type;
3003 if (!bfd_link_pic (info)
3004 && h->dynindx == -1
3005 && tls_type >= GOT_TLS_IE)
3006 r_type = R_390_TLS_LE32;
3007 }
3008 if (r_type == R_390_TLS_GD32 && tls_type >= GOT_TLS_IE)
3009 r_type = R_390_TLS_IE32;
3010
3011 if (r_type == R_390_TLS_LE32)
3012 {
3013 /* This relocation gets optimized away by the local exec
3014 access optimization. */
3015 BFD_ASSERT (! unresolved_reloc);
3016 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3017 contents + rel->r_offset);
3018 continue;
3019 }
3020
3021 if (htab->elf.sgot == NULL)
3022 abort ();
3023
3024 if (h != NULL)
3025 off = h->got.offset;
3026 else
3027 {
3028 if (local_got_offsets == NULL)
3029 abort ();
3030
3031 off = local_got_offsets[r_symndx];
3032 }
3033
3034 emit_tls_relocs:
3035
3036 if ((off & 1) != 0)
3037 off &= ~1;
3038 else
3039 {
3040 Elf_Internal_Rela outrel;
3041 bfd_byte *loc;
3042 int dr_type, indx;
3043
3044 if (htab->elf.srelgot == NULL)
3045 abort ();
3046
3047 outrel.r_offset = (htab->elf.sgot->output_section->vma
3048 + htab->elf.sgot->output_offset + off);
3049
3050 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3051 if (r_type == R_390_TLS_GD32)
3052 dr_type = R_390_TLS_DTPMOD;
3053 else
3054 dr_type = R_390_TLS_TPOFF;
3055 if (dr_type == R_390_TLS_TPOFF && indx == 0)
3056 outrel.r_addend = relocation - dtpoff_base (info);
3057 else
3058 outrel.r_addend = 0;
3059 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3060 loc = htab->elf.srelgot->contents;
3061 loc += htab->elf.srelgot->reloc_count++
3062 * sizeof (Elf32_External_Rela);
3063 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3064
3065 if (r_type == R_390_TLS_GD32)
3066 {
3067 if (indx == 0)
3068 {
3069 BFD_ASSERT (! unresolved_reloc);
3070 bfd_put_32 (output_bfd,
3071 relocation - dtpoff_base (info),
3072 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3073 }
3074 else
3075 {
3076 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_DTPOFF);
3077 outrel.r_offset += GOT_ENTRY_SIZE;
3078 outrel.r_addend = 0;
3079 htab->elf.srelgot->reloc_count++;
3080 loc += sizeof (Elf32_External_Rela);
3081 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3082 }
3083 }
3084
3085 if (h != NULL)
3086 h->got.offset |= 1;
3087 else
3088 local_got_offsets[r_symndx] |= 1;
3089 }
3090
3091 if (off >= (bfd_vma) -2)
3092 abort ();
3093 if (r_type == ELF32_R_TYPE (rel->r_info))
3094 {
3095 relocation = htab->elf.sgot->output_offset + off;
3096 if (r_type == R_390_TLS_IE32 || r_type == R_390_TLS_IEENT)
3097 relocation += htab->elf.sgot->output_section->vma;
3098 unresolved_reloc = FALSE;
3099 }
3100 else
3101 {
3102 bfd_put_32 (output_bfd, htab->elf.sgot->output_offset + off,
3103 contents + rel->r_offset);
3104 continue;
3105 }
3106 break;
3107
3108 case R_390_TLS_GOTIE12:
3109 case R_390_TLS_GOTIE20:
3110 case R_390_TLS_IEENT:
3111 if (h == NULL)
3112 {
3113 if (local_got_offsets == NULL)
3114 abort();
3115 off = local_got_offsets[r_symndx];
3116 if (bfd_link_pic (info))
3117 goto emit_tls_relocs;
3118 }
3119 else
3120 {
3121 off = h->got.offset;
3122 tls_type = elf_s390_hash_entry(h)->tls_type;
3123 if (bfd_link_pic (info)
3124 || h->dynindx != -1
3125 || tls_type < GOT_TLS_IE)
3126 goto emit_tls_relocs;
3127 }
3128
3129 if (htab->elf.sgot == NULL)
3130 abort ();
3131
3132 BFD_ASSERT (! unresolved_reloc);
3133 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3134 htab->elf.sgot->contents + off);
3135 relocation = htab->elf.sgot->output_offset + off;
3136 if (r_type == R_390_TLS_IEENT)
3137 relocation += htab->elf.sgot->output_section->vma;
3138 unresolved_reloc = FALSE;
3139 break;
3140
3141 case R_390_TLS_LDM32:
3142 if (! bfd_link_pic (info))
3143 /* The literal pool entry this relocation refers to gets ignored
3144 by the optimized code of the local exec model. Do nothing
3145 and the value will turn out zero. */
3146 continue;
3147
3148 if (htab->elf.sgot == NULL)
3149 abort ();
3150
3151 off = htab->tls_ldm_got.offset;
3152 if (off & 1)
3153 off &= ~1;
3154 else
3155 {
3156 Elf_Internal_Rela outrel;
3157 bfd_byte *loc;
3158
3159 if (htab->elf.srelgot == NULL)
3160 abort ();
3161
3162 outrel.r_offset = (htab->elf.sgot->output_section->vma
3163 + htab->elf.sgot->output_offset + off);
3164
3165 bfd_put_32 (output_bfd, 0,
3166 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3167 outrel.r_info = ELF32_R_INFO (0, R_390_TLS_DTPMOD);
3168 outrel.r_addend = 0;
3169 loc = htab->elf.srelgot->contents;
3170 loc += htab->elf.srelgot->reloc_count++
3171 * sizeof (Elf32_External_Rela);
3172 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3173 htab->tls_ldm_got.offset |= 1;
3174 }
3175 relocation = htab->elf.sgot->output_offset + off;
3176 unresolved_reloc = FALSE;
3177 break;
3178
3179 case R_390_TLS_LE32:
3180 if (bfd_link_dll (info))
3181 {
3182 /* Linking a shared library with non-fpic code requires
3183 a R_390_TLS_TPOFF relocation. */
3184 Elf_Internal_Rela outrel;
3185 asection *sreloc;
3186 bfd_byte *loc;
3187 int indx;
3188
3189 outrel.r_offset = rel->r_offset
3190 + input_section->output_section->vma
3191 + input_section->output_offset;
3192 if (h != NULL && h->dynindx != -1)
3193 indx = h->dynindx;
3194 else
3195 indx = 0;
3196 outrel.r_info = ELF32_R_INFO (indx, R_390_TLS_TPOFF);
3197 if (indx == 0)
3198 outrel.r_addend = relocation - dtpoff_base (info);
3199 else
3200 outrel.r_addend = 0;
3201 sreloc = elf_section_data (input_section)->sreloc;
3202 if (sreloc == NULL)
3203 abort ();
3204 loc = sreloc->contents;
3205 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
3206 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
3207 }
3208 else
3209 {
3210 BFD_ASSERT (! unresolved_reloc);
3211 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3212 contents + rel->r_offset);
3213 }
3214 continue;
3215
3216 case R_390_TLS_LDO32:
3217 if (bfd_link_pic (info) || (input_section->flags & SEC_DEBUGGING))
3218 relocation -= dtpoff_base (info);
3219 else
3220 /* When converting LDO to LE, we must negate. */
3221 relocation = -tpoff (info, relocation);
3222 break;
3223
3224 /* Relocations for tls instructions. */
3225 case R_390_TLS_LOAD:
3226 case R_390_TLS_GDCALL:
3227 case R_390_TLS_LDCALL:
3228 tls_type = GOT_UNKNOWN;
3229 if (h == NULL && local_got_offsets)
3230 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
3231 else if (h != NULL)
3232 tls_type = elf_s390_hash_entry(h)->tls_type;
3233
3234 if (tls_type == GOT_TLS_GD)
3235 continue;
3236
3237 if (r_type == R_390_TLS_LOAD)
3238 {
3239 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
3240 {
3241 /* IE->LE transition. Four valid cases:
3242 l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0
3243 l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0
3244 l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0
3245 l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
3246 unsigned int insn, ry;
3247
3248 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3249 ry = 0;
3250 if ((insn & 0xff00f000) == 0x58000000)
3251 /* l %rx,0(%ry,0) -> lr %rx,%ry + bcr 0,0 */
3252 ry = (insn & 0x000f0000);
3253 else if ((insn & 0xff0f0000) == 0x58000000)
3254 /* l %rx,0(0,%ry) -> lr %rx,%ry + bcr 0,0 */
3255 ry = (insn & 0x0000f000) << 4;
3256 else if ((insn & 0xff00f000) == 0x5800c000)
3257 /* l %rx,0(%ry,%r12) -> lr %rx,%ry + bcr 0,0 */
3258 ry = (insn & 0x000f0000);
3259 else if ((insn & 0xff0f0000) == 0x580c0000)
3260 /* l %rx,0(%r12,%ry) -> lr %rx,%ry + bcr 0,0 */
3261 ry = (insn & 0x0000f000) << 4;
3262 else
3263 invalid_tls_insn (input_bfd, input_section, rel);
3264 insn = 0x18000700 | (insn & 0x00f00000) | ry;
3265 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3266 }
3267 }
3268 else if (r_type == R_390_TLS_GDCALL)
3269 {
3270 unsigned int insn;
3271
3272 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3273 if ((insn & 0xff000fff) != 0x4d000000 &&
3274 (insn & 0xffff0000) != 0xc0e50000 &&
3275 (insn & 0xff000000) != 0x0d000000)
3276 invalid_tls_insn (input_bfd, input_section, rel);
3277 if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
3278 {
3279 if ((insn & 0xff000000) == 0x0d000000)
3280 {
3281 /* GD->LE transition.
3282 basr rx, ry -> nopr r7 */
3283 insn = 0x07070000 | (insn & 0xffff);
3284 }
3285 else if ((insn & 0xff000000) == 0x4d000000)
3286 {
3287 /* GD->LE transition.
3288 bas %r14,0(%rx,%r13) -> bc 0,0 */
3289 insn = 0x47000000;
3290 }
3291 else
3292 {
3293 /* GD->LE transition.
3294 brasl %r14,_tls_get_offset@plt -> brcl 0,. */
3295 insn = 0xc0040000;
3296 bfd_put_16 (output_bfd, 0x0000,
3297 contents + rel->r_offset + 4);
3298 }
3299 }
3300 else
3301 {
3302 /* If basr is used in the pic case to invoke
3303 _tls_get_offset, something went wrong before. */
3304 if ((insn & 0xff000000) == 0x0d000000)
3305 invalid_tls_insn (input_bfd, input_section, rel);
3306
3307 if ((insn & 0xff000000) == 0x4d000000)
3308 {
3309 /* GD->IE transition.
3310 bas %r14,0(%rx,%r13) -> l %r2,0(%r2,%r12) */
3311 insn = 0x5822c000;
3312 }
3313 else
3314 {
3315 /* GD->IE transition.
3316 brasl %r14,__tls_get_addr@plt ->
3317 l %r2,0(%r2,%r12) ; bcr 0,0 */
3318 insn = 0x5822c000;
3319 bfd_put_16 (output_bfd, 0x0700,
3320 contents + rel->r_offset + 4);
3321 }
3322 }
3323 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3324 }
3325 else if (r_type == R_390_TLS_LDCALL)
3326 {
3327 if (!bfd_link_pic (info))
3328 {
3329 unsigned int insn;
3330
3331 insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
3332 if ((insn & 0xff000fff) != 0x4d000000 &&
3333 (insn & 0xffff0000) != 0xc0e50000 &&
3334 (insn & 0xff000000) != 0x0d000000)
3335 invalid_tls_insn (input_bfd, input_section, rel);
3336
3337 if ((insn & 0xff000000) == 0x0d000000)
3338 {
3339 /* LD->LE transition.
3340 basr rx, ry -> nopr r7 */
3341 insn = 0x07070000 | (insn & 0xffff);
3342 }
3343 else if ((insn & 0xff000000) == 0x4d000000)
3344 {
3345 /* LD->LE transition.
3346 bas %r14,0(%rx,%r13) -> bc 0,0 */
3347 insn = 0x47000000;
3348 }
3349 else
3350 {
3351 /* LD->LE transition.
3352 brasl %r14,__tls_get_offset@plt -> brcl 0,. */
3353 insn = 0xc0040000;
3354 bfd_put_16 (output_bfd, 0x0000,
3355 contents + rel->r_offset + 4);
3356 }
3357 bfd_put_32 (output_bfd, insn, contents + rel->r_offset);
3358 }
3359 }
3360 continue;
3361
3362 default:
3363 break;
3364 }
3365
3366 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3367 because such sections are not SEC_ALLOC and thus ld.so will
3368 not process them. */
3369 if (unresolved_reloc
3370 && !((input_section->flags & SEC_DEBUGGING) != 0
3371 && h->def_dynamic)
3372 && _bfd_elf_section_offset (output_bfd, info, input_section,
3373 rel->r_offset) != (bfd_vma) -1)
3374 (*_bfd_error_handler)
3375 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3376 input_bfd,
3377 input_section,
3378 (long) rel->r_offset,
3379 howto->name,
3380 h->root.root.string);
3381
3382 do_relocation:
3383
3384 /* When applying a 24 bit reloc we need to start one byte
3385 earlier. Otherwise the 32 bit get/put bfd operations might
3386 access a byte after the actual section. */
3387 if (r_type == R_390_PC24DBL
3388 || r_type == R_390_PLT24DBL)
3389 rel->r_offset--;
3390
3391 if (r_type == R_390_20
3392 || r_type == R_390_GOT20
3393 || r_type == R_390_GOTPLT20
3394 || r_type == R_390_TLS_GOTIE20)
3395 {
3396 relocation += rel->r_addend;
3397 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3398 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3399 contents, rel->r_offset,
3400 relocation, 0);
3401 }
3402 else
3403 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3404 contents, rel->r_offset,
3405 relocation, rel->r_addend);
3406
3407 if (r != bfd_reloc_ok)
3408 {
3409 const char *name;
3410
3411 if (h != NULL)
3412 name = h->root.root.string;
3413 else
3414 {
3415 name = bfd_elf_string_from_elf_section (input_bfd,
3416 symtab_hdr->sh_link,
3417 sym->st_name);
3418 if (name == NULL)
3419 return FALSE;
3420 if (*name == '\0')
3421 name = bfd_section_name (input_bfd, sec);
3422 }
3423
3424 if (r == bfd_reloc_overflow)
3425 {
3426
3427 if (! ((*info->callbacks->reloc_overflow)
3428 (info, (h ? &h->root : NULL), name, howto->name,
3429 (bfd_vma) 0, input_bfd, input_section,
3430 rel->r_offset)))
3431 return FALSE;
3432 }
3433 else
3434 {
3435 (*_bfd_error_handler)
3436 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3437 input_bfd, input_section,
3438 (long) rel->r_offset, name, (int) r);
3439 return FALSE;
3440 }
3441 }
3442 }
3443
3444 return TRUE;
3445 }
3446
3447 /* Generate the PLT slots together with the dynamic relocations needed
3448 for IFUNC symbols. */
3449
3450 static void
3451 elf_s390_finish_ifunc_symbol (bfd *output_bfd,
3452 struct bfd_link_info *info,
3453 struct elf_link_hash_entry *h,
3454 struct elf_s390_link_hash_table *htab,
3455 bfd_vma iplt_offset,
3456 bfd_vma resolver_address)
3457 {
3458 bfd_vma iplt_index;
3459 bfd_vma got_offset;
3460 bfd_vma igotiplt_offset;
3461 Elf_Internal_Rela rela;
3462 bfd_byte *loc;
3463 asection *plt, *gotplt, *relplt;
3464 bfd_vma relative_offset;
3465
3466 if (htab->elf.iplt == NULL
3467 || htab->elf.igotplt == NULL
3468 || htab->elf.irelplt == NULL)
3469 abort ();
3470
3471 gotplt = htab->elf.igotplt;
3472 relplt = htab->elf.irelplt;
3473
3474 /* Index of the PLT slot within iplt section. */
3475 iplt_index = iplt_offset / PLT_ENTRY_SIZE;
3476 plt = htab->elf.iplt;
3477 /* Offset into the igot.plt section. */
3478 igotiplt_offset = iplt_index * GOT_ENTRY_SIZE;
3479 /* Offset into the got section. */
3480 got_offset = igotiplt_offset + gotplt->output_offset;
3481
3482 /* S390 uses halfwords for relative branch calc! */
3483 relative_offset = - (plt->output_offset +
3484 (PLT_ENTRY_SIZE * iplt_index) + 18) / 2;
3485 /* If offset is > 32768, branch to a previous branch
3486 390 can only handle +-64 K jumps. */
3487 if ( -32768 > (int) relative_offset )
3488 relative_offset
3489 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3490
3491 /* Fill in the entry in the procedure linkage table. */
3492 if (!bfd_link_pic (info))
3493 {
3494 memcpy (plt->contents + iplt_offset, elf_s390_plt_entry,
3495 PLT_ENTRY_SIZE);
3496
3497 /* Adjust jump to the first plt entry. */
3498 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3499 plt->contents + iplt_offset + 20);
3500
3501 /* Push the GOT offset field. */
3502 bfd_put_32 (output_bfd,
3503 (gotplt->output_section->vma
3504 + got_offset),
3505 plt->contents + iplt_offset + 24);
3506 }
3507 else if (got_offset < 4096)
3508 {
3509 /* The GOT offset is small enough to be used directly as
3510 displacement. */
3511 memcpy (plt->contents + iplt_offset,
3512 elf_s390_plt_pic12_entry,
3513 PLT_ENTRY_SIZE);
3514
3515 /* Put in the GOT offset as displacement value. The 0xc000
3516 value comes from the first word of the plt entry. Look
3517 at the elf_s390_plt_pic16_entry content. */
3518 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset,
3519 plt->contents + iplt_offset + 2);
3520
3521 /* Adjust the jump to the first plt entry. */
3522 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3523 plt->contents + iplt_offset + 20);
3524 }
3525 else if (got_offset < 32768)
3526 {
3527 /* The GOT offset is too big for a displacement but small
3528 enough to be a signed 16 bit immediate value as it can be
3529 used in an lhi instruction. */
3530 memcpy (plt->contents + iplt_offset,
3531 elf_s390_plt_pic16_entry,
3532 PLT_ENTRY_SIZE);
3533
3534 /* Put in the GOT offset for the lhi instruction. */
3535 bfd_put_16 (output_bfd, (bfd_vma)got_offset,
3536 plt->contents + iplt_offset + 2);
3537
3538 /* Adjust the jump to the first plt entry. */
3539 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3540 plt->contents + iplt_offset + 20);
3541 }
3542 else
3543 {
3544 memcpy (plt->contents + iplt_offset,
3545 elf_s390_plt_pic_entry,
3546 PLT_ENTRY_SIZE);
3547
3548 /* Adjust the jump to the first plt entry. */
3549 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3550 plt->contents + iplt_offset + 20);
3551
3552 /* Push the GOT offset field. */
3553 bfd_put_32 (output_bfd, got_offset,
3554 plt->contents + iplt_offset + 24);
3555 }
3556 /* Insert offset into reloc. table here. */
3557 bfd_put_32 (output_bfd, relplt->output_offset +
3558 iplt_index * RELA_ENTRY_SIZE,
3559 plt->contents + iplt_offset + 28);
3560
3561 /* Fill in the entry in the global offset table.
3562 Points to instruction after GOT offset. */
3563 bfd_put_32 (output_bfd,
3564 (plt->output_section->vma
3565 + plt->output_offset
3566 + iplt_offset
3567 + 12),
3568 gotplt->contents + igotiplt_offset);
3569
3570 /* Fill in the entry in the .rela.plt section. */
3571 rela.r_offset = gotplt->output_section->vma + got_offset;
3572
3573 if (!h
3574 || h->dynindx == -1
3575 || ((bfd_link_executable (info)
3576 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3577 && h->def_regular))
3578 {
3579 /* The symbol can be locally resolved. */
3580 rela.r_info = ELF32_R_INFO (0, R_390_IRELATIVE);
3581 rela.r_addend = resolver_address;
3582 }
3583 else
3584 {
3585 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3586 rela.r_addend = 0;
3587 }
3588
3589 loc = relplt->contents + iplt_index * RELA_ENTRY_SIZE;
3590 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3591 }
3592
3593 /* Finish up dynamic symbol handling. We set the contents of various
3594 dynamic sections here. */
3595
3596 static bfd_boolean
3597 elf_s390_finish_dynamic_symbol (bfd *output_bfd,
3598 struct bfd_link_info *info,
3599 struct elf_link_hash_entry *h,
3600 Elf_Internal_Sym *sym)
3601 {
3602 struct elf_s390_link_hash_table *htab;
3603 struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry*)h;
3604
3605 htab = elf_s390_hash_table (info);
3606
3607 if (h->plt.offset != (bfd_vma) -1)
3608 {
3609 bfd_vma plt_index;
3610 bfd_vma got_offset;
3611 Elf_Internal_Rela rela;
3612 bfd_byte *loc;
3613 bfd_vma relative_offset;
3614
3615 /* This symbol has an entry in the procedure linkage table. Set
3616 it up. */
3617 if (s390_is_ifunc_symbol_p (h) && h->def_regular)
3618 {
3619 elf_s390_finish_ifunc_symbol (output_bfd, info, h,
3620 htab, h->plt.offset,
3621 eh->ifunc_resolver_address +
3622 eh->ifunc_resolver_section->output_offset +
3623 eh->ifunc_resolver_section->output_section->vma);
3624 /* Do not return yet. Handling of explicit GOT slots of
3625 IFUNC symbols is below. */
3626 }
3627 else
3628 {
3629 if (h->dynindx == -1
3630 || htab->elf.splt == NULL
3631 || htab->elf.sgotplt == NULL
3632 || htab->elf.srelplt == NULL)
3633 abort ();
3634
3635 /* Calc. index no.
3636 Current offset - size first entry / entry size. */
3637 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3638
3639 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
3640 addr & GOT addr. */
3641 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3642
3643 /* S390 uses halfwords for relative branch calc! */
3644 relative_offset = - ((PLT_FIRST_ENTRY_SIZE +
3645 (PLT_ENTRY_SIZE * plt_index) + 18) / 2);
3646 /* If offset is > 32768, branch to a previous branch
3647 390 can only handle +-64 K jumps. */
3648 if ( -32768 > (int) relative_offset )
3649 relative_offset
3650 = -(unsigned) (((65536 / PLT_ENTRY_SIZE - 1) * PLT_ENTRY_SIZE) / 2);
3651
3652 /* Fill in the entry in the procedure linkage table. */
3653 if (!bfd_link_pic (info))
3654 {
3655 memcpy (htab->elf.splt->contents + h->plt.offset, elf_s390_plt_entry,
3656 PLT_ENTRY_SIZE);
3657
3658 /* Adjust jump to the first plt entry. */
3659 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3660 htab->elf.splt->contents + h->plt.offset + 20);
3661
3662 /* Push the GOT offset field. */
3663 bfd_put_32 (output_bfd,
3664 (htab->elf.sgotplt->output_section->vma
3665 + htab->elf.sgotplt->output_offset
3666 + got_offset),
3667 htab->elf.splt->contents + h->plt.offset + 24);
3668 }
3669 else if (got_offset < 4096)
3670 {
3671 /* The GOT offset is small enough to be used directly as
3672 displacement. */
3673 memcpy (htab->elf.splt->contents + h->plt.offset,
3674 elf_s390_plt_pic12_entry,
3675 PLT_ENTRY_SIZE);
3676
3677 /* Put in the GOT offset as displacement value. The 0xc000
3678 value comes from the first word of the plt entry. Look
3679 at the elf_s390_plt_pic16_entry content. */
3680 bfd_put_16 (output_bfd, (bfd_vma)0xc000 | got_offset,
3681 htab->elf.splt->contents + h->plt.offset + 2);
3682
3683 /* Adjust the jump to the first plt entry. */
3684 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3685 htab->elf.splt->contents + h->plt.offset + 20);
3686 }
3687 else if (got_offset < 32768)
3688 {
3689 /* The GOT offset is too big for a displacement but small
3690 enough to be a signed 16 bit immediate value as it can be
3691 used in an lhi instruction. */
3692 memcpy (htab->elf.splt->contents + h->plt.offset,
3693 elf_s390_plt_pic16_entry,
3694 PLT_ENTRY_SIZE);
3695
3696 /* Put in the GOT offset for the lhi instruction. */
3697 bfd_put_16 (output_bfd, (bfd_vma)got_offset,
3698 htab->elf.splt->contents + h->plt.offset + 2);
3699
3700 /* Adjust the jump to the first plt entry. */
3701 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3702 htab->elf.splt->contents + h->plt.offset + 20);
3703 }
3704 else
3705 {
3706 memcpy (htab->elf.splt->contents + h->plt.offset,
3707 elf_s390_plt_pic_entry,
3708 PLT_ENTRY_SIZE);
3709
3710 /* Adjust the jump to the first plt entry. */
3711 bfd_put_32 (output_bfd, (bfd_vma) 0+(relative_offset << 16),
3712 htab->elf.splt->contents + h->plt.offset + 20);
3713
3714 /* Push the GOT offset field. */
3715 bfd_put_32 (output_bfd, got_offset,
3716 htab->elf.splt->contents + h->plt.offset + 24);
3717 }
3718 /* Insert offset into reloc. table here. */
3719 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
3720 htab->elf.splt->contents + h->plt.offset + 28);
3721
3722 /* Fill in the entry in the global offset table.
3723 Points to instruction after GOT offset. */
3724 bfd_put_32 (output_bfd,
3725 (htab->elf.splt->output_section->vma
3726 + htab->elf.splt->output_offset
3727 + h->plt.offset
3728 + 12),
3729 htab->elf.sgotplt->contents + got_offset);
3730
3731 /* Fill in the entry in the .rela.plt section. */
3732 rela.r_offset = (htab->elf.sgotplt->output_section->vma
3733 + htab->elf.sgotplt->output_offset
3734 + got_offset);
3735 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_JMP_SLOT);
3736 rela.r_addend = 0;
3737 loc = htab->elf.srelplt->contents + plt_index * sizeof (Elf32_External_Rela);
3738 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3739
3740 if (!h->def_regular)
3741 {
3742 /* Mark the symbol as undefined, rather than as defined in
3743 the .plt section. Leave the value alone. This is a clue
3744 for the dynamic linker, to make function pointer
3745 comparisons work between an application and shared
3746 library. */
3747 sym->st_shndx = SHN_UNDEF;
3748 }
3749 }
3750 }
3751
3752 if (h->got.offset != (bfd_vma) -1
3753 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3754 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3755 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3756 {
3757 Elf_Internal_Rela rela;
3758 bfd_byte *loc;
3759
3760 /* This symbol has an entry in the global offset table. Set it
3761 up. */
3762
3763 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3764 abort ();
3765
3766 rela.r_offset = (htab->elf.sgot->output_section->vma
3767 + htab->elf.sgot->output_offset
3768 + (h->got.offset &~ (bfd_vma) 1));
3769
3770 /* If this is a static link, or it is a -Bsymbolic link and the
3771 symbol is defined locally or was forced to be local because
3772 of a version file, we just want to emit a RELATIVE reloc.
3773 The entry in the global offset table will already have been
3774 initialized in the relocate_section function. */
3775 if (h->def_regular && s390_is_ifunc_symbol_p (h))
3776 {
3777 if (bfd_link_pic (info))
3778 {
3779 /* An explicit GOT slot usage needs GLOB_DAT. If the
3780 symbol references local the implicit got.iplt slot
3781 will be used and the IRELATIVE reloc has been created
3782 above. */
3783 goto do_glob_dat;
3784 }
3785 else
3786 {
3787 /* For non-shared objects explicit GOT slots must be
3788 filled with the PLT slot address for pointer
3789 equality reasons. */
3790 bfd_put_32 (output_bfd, (htab->elf.iplt->output_section->vma
3791 + htab->elf.iplt->output_offset
3792 + h->plt.offset),
3793 htab->elf.sgot->contents + h->got.offset);
3794 return TRUE;
3795 }
3796 }
3797 else if (bfd_link_pic (info)
3798 && SYMBOL_REFERENCES_LOCAL (info, h))
3799 {
3800 /* If this is a static link, or it is a -Bsymbolic link and
3801 the symbol is defined locally or was forced to be local
3802 because of a version file, we just want to emit a
3803 RELATIVE reloc. The entry in the global offset table
3804 will already have been initialized in the
3805 relocate_section function. */
3806 if (!h->def_regular)
3807 return FALSE;
3808 BFD_ASSERT((h->got.offset & 1) != 0);
3809 rela.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
3810 rela.r_addend = (h->root.u.def.value
3811 + h->root.u.def.section->output_section->vma
3812 + h->root.u.def.section->output_offset);
3813 }
3814 else
3815 {
3816 BFD_ASSERT((h->got.offset & 1) == 0);
3817 do_glob_dat:
3818 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset);
3819 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_GLOB_DAT);
3820 rela.r_addend = 0;
3821 }
3822
3823 loc = htab->elf.srelgot->contents;
3824 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
3825 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3826 }
3827
3828 if (h->needs_copy)
3829 {
3830 Elf_Internal_Rela rela;
3831 bfd_byte *loc;
3832
3833 /* This symbols needs a copy reloc. Set it up. */
3834
3835 if (h->dynindx == -1
3836 || (h->root.type != bfd_link_hash_defined
3837 && h->root.type != bfd_link_hash_defweak)
3838 || htab->srelbss == NULL)
3839 abort ();
3840
3841 rela.r_offset = (h->root.u.def.value
3842 + h->root.u.def.section->output_section->vma
3843 + h->root.u.def.section->output_offset);
3844 rela.r_info = ELF32_R_INFO (h->dynindx, R_390_COPY);
3845 rela.r_addend = 0;
3846 loc = htab->srelbss->contents;
3847 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rela);
3848 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc);
3849 }
3850
3851 /* Mark some specially defined symbols as absolute. */
3852 if (h == htab->elf.hdynamic
3853 || h == htab->elf.hgot
3854 || h == htab->elf.hplt)
3855 sym->st_shndx = SHN_ABS;
3856
3857 return TRUE;
3858 }
3859
3860 /* Used to decide how to sort relocs in an optimal manner for the
3861 dynamic linker, before writing them out. */
3862
3863 static enum elf_reloc_type_class
3864 elf_s390_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
3865 const asection *rel_sec ATTRIBUTE_UNUSED,
3866 const Elf_Internal_Rela *rela)
3867 {
3868 bfd *abfd = info->output_bfd;
3869 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3870 struct elf_s390_link_hash_table *htab = elf_s390_hash_table (info);
3871 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3872 Elf_Internal_Sym sym;
3873
3874 if (htab->elf.dynsym == NULL
3875 || !bed->s->swap_symbol_in (abfd,
3876 (htab->elf.dynsym->contents
3877 + r_symndx * bed->s->sizeof_sym),
3878 0, &sym))
3879 abort ();
3880
3881 /* Check relocation against STT_GNU_IFUNC symbol. */
3882 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3883 return reloc_class_ifunc;
3884
3885 switch ((int) ELF32_R_TYPE (rela->r_info))
3886 {
3887 case R_390_RELATIVE:
3888 return reloc_class_relative;
3889 case R_390_JMP_SLOT:
3890 return reloc_class_plt;
3891 case R_390_COPY:
3892 return reloc_class_copy;
3893 default:
3894 return reloc_class_normal;
3895 }
3896 }
3897
3898 /* Finish up the dynamic sections. */
3899
3900 static bfd_boolean
3901 elf_s390_finish_dynamic_sections (bfd *output_bfd,
3902 struct bfd_link_info *info)
3903 {
3904 struct elf_s390_link_hash_table *htab;
3905 bfd *dynobj;
3906 asection *sdyn;
3907 bfd *ibfd;
3908 unsigned int i;
3909
3910 htab = elf_s390_hash_table (info);
3911 dynobj = htab->elf.dynobj;
3912 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3913
3914 if (htab->elf.dynamic_sections_created)
3915 {
3916 Elf32_External_Dyn *dyncon, *dynconend;
3917
3918 if (sdyn == NULL || htab->elf.sgot == NULL)
3919 abort ();
3920
3921 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3922 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3923 for (; dyncon < dynconend; dyncon++)
3924 {
3925 Elf_Internal_Dyn dyn;
3926 asection *s;
3927
3928 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3929
3930 switch (dyn.d_tag)
3931 {
3932 default:
3933 continue;
3934
3935 case DT_PLTGOT:
3936 dyn.d_un.d_ptr = htab->elf.sgot->output_section->vma;
3937 break;
3938
3939 case DT_JMPREL:
3940 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
3941 break;
3942
3943 case DT_PLTRELSZ:
3944 s = htab->elf.srelplt->output_section;
3945 dyn.d_un.d_val = s->size;
3946 break;
3947 }
3948
3949 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3950 }
3951
3952 /* Fill in the special first entry in the procedure linkage table. */
3953 if (htab->elf.splt && htab->elf.splt->size > 0)
3954 {
3955 memset (htab->elf.splt->contents, 0, PLT_FIRST_ENTRY_SIZE);
3956 if (bfd_link_pic (info))
3957 {
3958 memcpy (htab->elf.splt->contents, elf_s390_plt_pic_first_entry,
3959 PLT_FIRST_ENTRY_SIZE);
3960 }
3961 else
3962 {
3963 memcpy (htab->elf.splt->contents, elf_s390_plt_first_entry,
3964 PLT_FIRST_ENTRY_SIZE);
3965 bfd_put_32 (output_bfd,
3966 htab->elf.sgotplt->output_section->vma
3967 + htab->elf.sgotplt->output_offset,
3968 htab->elf.splt->contents + 24);
3969 }
3970 elf_section_data (htab->elf.splt->output_section)
3971 ->this_hdr.sh_entsize = 4;
3972 }
3973
3974 }
3975
3976 if (htab->elf.sgotplt)
3977 {
3978 /* Fill in the first three entries in the global offset table. */
3979 if (htab->elf.sgotplt->size > 0)
3980 {
3981 bfd_put_32 (output_bfd,
3982 (sdyn == NULL ? (bfd_vma) 0
3983 : sdyn->output_section->vma + sdyn->output_offset),
3984 htab->elf.sgotplt->contents);
3985 /* One entry for shared object struct ptr. */
3986 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 4);
3987 /* One entry for _dl_runtime_resolve. */
3988 bfd_put_32 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8);
3989 }
3990
3991 elf_section_data (htab->elf.sgotplt->output_section)
3992 ->this_hdr.sh_entsize = 4;
3993 }
3994 /* Finish dynamic symbol for local IFUNC symbols. */
3995 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3996 {
3997 struct plt_entry *local_plt;
3998 Elf_Internal_Sym *isym;
3999 Elf_Internal_Shdr *symtab_hdr;
4000
4001 symtab_hdr = &elf_symtab_hdr (ibfd);
4002
4003 local_plt = elf_s390_local_plt (ibfd);
4004 if (local_plt != NULL)
4005 for (i = 0; i < symtab_hdr->sh_info; i++)
4006 {
4007 if (local_plt[i].plt.offset != (bfd_vma) -1)
4008 {
4009 asection *sec = local_plt[i].sec;
4010 isym = bfd_sym_from_r_symndx (&htab->sym_cache, ibfd, i);
4011 if (isym == NULL)
4012 return FALSE;
4013
4014 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
4015 elf_s390_finish_ifunc_symbol (output_bfd, info, NULL, htab,
4016 local_plt[i].plt.offset,
4017 isym->st_value
4018 + sec->output_section->vma
4019 + sec->output_offset);
4020
4021 }
4022 }
4023 }
4024 return TRUE;
4025 }
4026
4027 static bfd_boolean
4028 elf_s390_grok_prstatus (bfd * abfd, Elf_Internal_Note * note)
4029 {
4030 int offset;
4031 unsigned int size;
4032
4033 switch (note->descsz)
4034 {
4035 default:
4036 return FALSE;
4037
4038 case 224: /* S/390 Linux. */
4039 /* pr_cursig */
4040 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
4041
4042 /* pr_pid */
4043 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
4044
4045 /* pr_reg */
4046 offset = 72;
4047 size = 144;
4048 break;
4049 }
4050
4051 /* Make a ".reg/999" section. */
4052 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
4053 size, note->descpos + offset);
4054 }
4055
4056 /* Return address for Ith PLT stub in section PLT, for relocation REL
4057 or (bfd_vma) -1 if it should not be included. */
4058
4059 static bfd_vma
4060 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
4061 const arelent *rel ATTRIBUTE_UNUSED)
4062 {
4063 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
4064 }
4065
4066 /* Merge backend specific data from an object file to the output
4067 object file when linking. */
4068
4069 static bfd_boolean
4070 elf32_s390_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
4071 {
4072 if (!is_s390_elf (ibfd) || !is_s390_elf (obfd))
4073 return TRUE;
4074
4075 if (!elf_s390_merge_obj_attributes (ibfd, obfd))
4076 return FALSE;
4077
4078 elf_elfheader (obfd)->e_flags |= elf_elfheader (ibfd)->e_flags;
4079 return TRUE;
4080 }
4081
4082
4083 #define TARGET_BIG_SYM s390_elf32_vec
4084 #define TARGET_BIG_NAME "elf32-s390"
4085 #define ELF_ARCH bfd_arch_s390
4086 #define ELF_TARGET_ID S390_ELF_DATA
4087 #define ELF_MACHINE_CODE EM_S390
4088 #define ELF_MACHINE_ALT1 EM_S390_OLD
4089 #define ELF_MAXPAGESIZE 0x1000
4090
4091 #define elf_backend_can_gc_sections 1
4092 #define elf_backend_can_refcount 1
4093 #define elf_backend_want_got_plt 1
4094 #define elf_backend_plt_readonly 1
4095 #define elf_backend_want_plt_sym 0
4096 #define elf_backend_got_header_size 12
4097 #define elf_backend_rela_normal 1
4098
4099 #define elf_info_to_howto elf_s390_info_to_howto
4100
4101 #define bfd_elf32_bfd_is_local_label_name elf_s390_is_local_label_name
4102 #define bfd_elf32_bfd_link_hash_table_create elf_s390_link_hash_table_create
4103 #define bfd_elf32_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
4104 #define bfd_elf32_bfd_reloc_name_lookup elf_s390_reloc_name_lookup
4105
4106 #define bfd_elf32_bfd_merge_private_bfd_data elf32_s390_merge_private_bfd_data
4107
4108 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
4109 #define elf_backend_check_relocs elf_s390_check_relocs
4110 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
4111 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
4112 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
4113 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
4114 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
4115 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
4116 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
4117 #define elf_backend_relocate_section elf_s390_relocate_section
4118 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
4119 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4120 #define elf_backend_grok_prstatus elf_s390_grok_prstatus
4121 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
4122 #define elf_backend_add_symbol_hook elf_s390_add_symbol_hook
4123 #define elf_backend_sort_relocs_p elf_s390_elf_sort_relocs_p
4124
4125 #define bfd_elf32_mkobject elf_s390_mkobject
4126 #define elf_backend_object_p elf_s390_object_p
4127
4128 #include "elf32-target.h"
GDB Binutils - Deliverables
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